net/bonding/bond_main.c

0001 /*
0002  * originally based on the dummy device.
0003  *
0004  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
0005  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
0006  *
0007  * bonding.c: an Ethernet Bonding driver
0008  *
0009  * This is useful to talk to a Cisco EtherChannel compatible equipment:
0010  *  Cisco 5500
0011  *  Sun Trunking (Solaris)
0012  *  Alteon AceDirector Trunks
0013  *  Linux Bonding
0014  *  and probably many L2 switches ...
0015  *
0016  * How it works:
0017  *    ifconfig bond0 ipaddress netmask up
0018  *      will setup a network device, with an ip address.  No mac address
0019  *  will be assigned at this time.  The hw mac address will come from
0020  *  the first slave bonded to the channel.  All slaves will then use
0021  *  this hw mac address.
0022  *
0023  *    ifconfig bond0 down
0024  *         will release all slaves, marking them as down.
0025  *
0026  *    ifenslave bond0 eth0
0027  *  will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
0028  *  a: be used as initial mac address
0029  *  b: if a hw mac address already is there, eth0's hw mac address
0030  *     will then be set from bond0.
0031  *
0032  */
0033
0034 #include <linux/kernel.h>
0035 #include <linux/module.h>
0036 #include <linux/types.h>
0037 #include <linux/fcntl.h>
0038 #include <linux/filter.h>
0039 #include <linux/interrupt.h>
0040 #include <linux/ptrace.h>
0041 #include <linux/ioport.h>
0042 #include <linux/in.h>
0043 #include <net/ip.h>
0044 #include <linux/ip.h>
0045 #include <linux/icmp.h>
0046 #include <linux/icmpv6.h>
0047 #include <linux/tcp.h>
0048 #include <linux/udp.h>
0049 #include <linux/slab.h>
0050 #include <linux/string.h>
0051 #include <linux/init.h>
0052 #include <linux/timer.h>
0053 #include <linux/socket.h>
0054 #include <linux/ctype.h>
0055 #include <linux/inet.h>
0056 #include <linux/bitops.h>
0057 #include <linux/io.h>
0058 #include <asm/dma.h>
0059 #include <linux/uaccess.h>
0060 #include <linux/errno.h>
0061 #include <linux/netdevice.h>
0062 #include <linux/inetdevice.h>
0063 #include <linux/igmp.h>
0064 #include <linux/etherdevice.h>
0065 #include <linux/skbuff.h>
0066 #include <net/sock.h>
0067 #include <linux/rtnetlink.h>
0068 #include <linux/smp.h>
0069 #include <linux/if_ether.h>
0070 #include <net/arp.h>
0071 #include <linux/mii.h>
0072 #include <linux/ethtool.h>
0073 #include <linux/if_vlan.h>
0074 #include <linux/if_bonding.h>
0075 #include <linux/phy.h>
0076 #include <linux/jiffies.h>
0077 #include <linux/preempt.h>
0078 #include <net/route.h>
0079 #include <net/net_namespace.h>
0080 #include <net/netns/generic.h>
0081 #include <net/pkt_sched.h>
0082 #include <linux/rculist.h>
0083 #include <net/flow_dissector.h>
0084 #include <net/xfrm.h>
0085 #include <net/bonding.h>
0086 #include <net/bond_3ad.h>
0087 #include <net/bond_alb.h>
0088 #if IS_ENABLED(CONFIG_TLS_DEVICE)
0089 #include <net/tls.h>
0090 #endif
0091 #include <net/ip6_route.h>
0092
0093 #include "bonding_priv.h"
0094
0095 /*---------------------------- Module parameters ----------------------------*/
0096
0097 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
0098
0099 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
0100 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
0101 static int num_peer_notif = 1;
0102 static int miimon;
0103 static int updelay;
0104 static int downdelay;
0105 static int use_carrier  = 1;
0106 static char *mode;
0107 static char *primary;
0108 static char *primary_reselect;
0109 static char *lacp_rate;
0110 static int min_links;
0111 static char *ad_select;
0112 static char *xmit_hash_policy;
0113 static int arp_interval;
0114 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
0115 static char *arp_validate;
0116 static char *arp_all_targets;
0117 static char *fail_over_mac;
0118 static int all_slaves_active;
0119 static struct bond_params bonding_defaults;
0120 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
0121 static int packets_per_slave = 1;
0122 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
0123
0124 module_param(max_bonds, int, 0);
0125 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
0126 module_param(tx_queues, int, 0);
0127 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
0128 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
0129 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
0130                    "failover event (alias of num_unsol_na)");
0131 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
0132 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
0133                    "failover event (alias of num_grat_arp)");
0134 module_param(miimon, int, 0);
0135 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
0136 module_param(updelay, int, 0);
0137 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
0138 module_param(downdelay, int, 0);
0139 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
0140                 "in milliseconds");
0141 module_param(use_carrier, int, 0);
0142 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
0143                   "0 for off, 1 for on (default)");
0144 module_param(mode, charp, 0);
0145 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
0146                "1 for active-backup, 2 for balance-xor, "
0147                "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
0148                "6 for balance-alb");
0149 module_param(primary, charp, 0);
0150 MODULE_PARM_DESC(primary, "Primary network device to use");
0151 module_param(primary_reselect, charp, 0);
0152 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
0153                    "once it comes up; "
0154                    "0 for always (default), "
0155                    "1 for only if speed of primary is "
0156                    "better, "
0157                    "2 for only on active slave "
0158                    "failure");
0159 module_param(lacp_rate, charp, 0);
0160 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
0161                 "0 for slow, 1 for fast");
0162 module_param(ad_select, charp, 0);
0163 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
0164                 "0 for stable (default), 1 for bandwidth, "
0165                 "2 for count");
0166 module_param(min_links, int, 0);
0167 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
0168
0169 module_param(xmit_hash_policy, charp, 0);
0170 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
0171                    "0 for layer 2 (default), 1 for layer 3+4, "
0172                    "2 for layer 2+3, 3 for encap layer 2+3, "
0173                    "4 for encap layer 3+4, 5 for vlan+srcmac");
0174 module_param(arp_interval, int, 0);
0175 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
0176 module_param_array(arp_ip_target, charp, NULL, 0);
0177 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
0178 module_param(arp_validate, charp, 0);
0179 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
0180                    "0 for none (default), 1 for active, "
0181                    "2 for backup, 3 for all");
0182 module_param(arp_all_targets, charp, 0);
0183 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
0184 module_param(fail_over_mac, charp, 0);
0185 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
0186                 "the same MAC; 0 for none (default), "
0187                 "1 for active, 2 for follow");
0188 module_param(all_slaves_active, int, 0);
0189 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
0190                      "by setting active flag for all slaves; "
0191                      "0 for never (default), 1 for always.");
0192 module_param(resend_igmp, int, 0);
0193 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
0194                   "link failure");
0195 module_param(packets_per_slave, int, 0);
0196 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
0197                     "mode; 0 for a random slave, 1 packet per "
0198                     "slave (default), >1 packets per slave.");
0199 module_param(lp_interval, uint, 0);
0200 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
0201                   "the bonding driver sends learning packets to "
0202                   "each slaves peer switch. The default is 1.");
0203
0204 /*----------------------------- Global variables ----------------------------*/
0205
0206 #ifdef CONFIG_NET_POLL_CONTROLLER
0207 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
0208 #endif
0209
0210 unsigned int bond_net_id __read_mostly;
0211
0212 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
0213     {
0214         .key_id = FLOW_DISSECTOR_KEY_CONTROL,
0215         .offset = offsetof(struct flow_keys, control),
0216     },
0217     {
0218         .key_id = FLOW_DISSECTOR_KEY_BASIC,
0219         .offset = offsetof(struct flow_keys, basic),
0220     },
0221     {
0222         .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
0223         .offset = offsetof(struct flow_keys, addrs.v4addrs),
0224     },
0225     {
0226         .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
0227         .offset = offsetof(struct flow_keys, addrs.v6addrs),
0228     },
0229     {
0230         .key_id = FLOW_DISSECTOR_KEY_TIPC,
0231         .offset = offsetof(struct flow_keys, addrs.tipckey),
0232     },
0233     {
0234         .key_id = FLOW_DISSECTOR_KEY_PORTS,
0235         .offset = offsetof(struct flow_keys, ports),
0236     },
0237     {
0238         .key_id = FLOW_DISSECTOR_KEY_ICMP,
0239         .offset = offsetof(struct flow_keys, icmp),
0240     },
0241     {
0242         .key_id = FLOW_DISSECTOR_KEY_VLAN,
0243         .offset = offsetof(struct flow_keys, vlan),
0244     },
0245     {
0246         .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
0247         .offset = offsetof(struct flow_keys, tags),
0248     },
0249     {
0250         .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
0251         .offset = offsetof(struct flow_keys, keyid),
0252     },
0253 };
0254
0255 static struct flow_dissector flow_keys_bonding __read_mostly;
0256
0257 /*-------------------------- Forward declarations ---------------------------*/
0258
0259 static int bond_init(struct net_device *bond_dev);
0260 static void bond_uninit(struct net_device *bond_dev);
0261 static void bond_get_stats(struct net_device *bond_dev,
0262                struct rtnl_link_stats64 *stats);
0263 static void bond_slave_arr_handler(struct work_struct *work);
0264 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
0265                   int mod);
0266 static void bond_netdev_notify_work(struct work_struct *work);
0267
0268 /*---------------------------- General routines -----------------------------*/
0269
0270 const char *bond_mode_name(int mode)
0271 {
0272     static const char *names[] = {
0273         [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
0274         [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
0275         [BOND_MODE_XOR] = "load balancing (xor)",
0276         [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
0277         [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
0278         [BOND_MODE_TLB] = "transmit load balancing",
0279         [BOND_MODE_ALB] = "adaptive load balancing",
0280     };
0281
0282     if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
0283         return "unknown";
0284
0285     return names[mode];
0286 }
0287
0288 /**
0289  * bond_dev_queue_xmit - Prepare skb for xmit.
0290  *
0291  * @bond: bond device that got this skb for tx.
0292  * @skb: hw accel VLAN tagged skb to transmit
0293  * @slave_dev: slave that is supposed to xmit this skbuff
0294  */
0295 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
0296             struct net_device *slave_dev)
0297 {
0298     skb->dev = slave_dev;
0299
0300     BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
0301              sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
0302     skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
0303
0304     if (unlikely(netpoll_tx_running(bond->dev)))
0305         return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
0306
0307     return dev_queue_xmit(skb);
0308 }
0309
0310 bool bond_sk_check(struct bonding *bond)
0311 {
0312     switch (BOND_MODE(bond)) {
0313     case BOND_MODE_8023AD:
0314     case BOND_MODE_XOR:
0315         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
0316             return true;
0317         fallthrough;
0318     default:
0319         return false;
0320     }
0321 }
0322
0323 static bool bond_xdp_check(struct bonding *bond)
0324 {
0325     switch (BOND_MODE(bond)) {
0326     case BOND_MODE_ROUNDROBIN:
0327     case BOND_MODE_ACTIVEBACKUP:
0328         return true;
0329     case BOND_MODE_8023AD:
0330     case BOND_MODE_XOR:
0331         /* vlan+srcmac is not supported with XDP as in most cases the 802.1q
0332          * payload is not in the packet due to hardware offload.
0333          */
0334         if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC)
0335             return true;
0336         fallthrough;
0337     default:
0338         return false;
0339     }
0340 }
0341
0342 /*---------------------------------- VLAN -----------------------------------*/
0343
0344 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
0345  * We don't protect the slave list iteration with a lock because:
0346  * a. This operation is performed in IOCTL context,
0347  * b. The operation is protected by the RTNL semaphore in the 8021q code,
0348  * c. Holding a lock with BH disabled while directly calling a base driver
0349  *    entry point is generally a BAD idea.
0350  *
0351  * The design of synchronization/protection for this operation in the 8021q
0352  * module is good for one or more VLAN devices over a single physical device
0353  * and cannot be extended for a teaming solution like bonding, so there is a
0354  * potential race condition here where a net device from the vlan group might
0355  * be referenced (either by a base driver or the 8021q code) while it is being
0356  * removed from the system. However, it turns out we're not making matters
0357  * worse, and if it works for regular VLAN usage it will work here too.
0358 */
0359
0360 /**
0361  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
0362  * @bond_dev: bonding net device that got called
0363  * @proto: network protocol ID
0364  * @vid: vlan id being added
0365  */
0366 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
0367                 __be16 proto, u16 vid)
0368 {
0369     struct bonding *bond = netdev_priv(bond_dev);
0370     struct slave *slave, *rollback_slave;
0371     struct list_head *iter;
0372     int res;
0373
0374     bond_for_each_slave(bond, slave, iter) {
0375         res = vlan_vid_add(slave->dev, proto, vid);
0376         if (res)
0377             goto unwind;
0378     }
0379
0380     return 0;
0381
0382 unwind:
0383     /* unwind to the slave that failed */
0384     bond_for_each_slave(bond, rollback_slave, iter) {
0385         if (rollback_slave == slave)
0386             break;
0387
0388         vlan_vid_del(rollback_slave->dev, proto, vid);
0389     }
0390
0391     return res;
0392 }
0393
0394 /**
0395  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
0396  * @bond_dev: bonding net device that got called
0397  * @proto: network protocol ID
0398  * @vid: vlan id being removed
0399  */
0400 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
0401                  __be16 proto, u16 vid)
0402 {
0403     struct bonding *bond = netdev_priv(bond_dev);
0404     struct list_head *iter;
0405     struct slave *slave;
0406
0407     bond_for_each_slave(bond, slave, iter)
0408         vlan_vid_del(slave->dev, proto, vid);
0409
0410     if (bond_is_lb(bond))
0411         bond_alb_clear_vlan(bond, vid);
0412
0413     return 0;
0414 }
0415
0416 /*---------------------------------- XFRM -----------------------------------*/
0417
0418 #ifdef CONFIG_XFRM_OFFLOAD
0419 /**
0420  * bond_ipsec_add_sa - program device with a security association
0421  * @xs: pointer to transformer state struct
0422  **/
0423 static int bond_ipsec_add_sa(struct xfrm_state *xs)
0424 {
0425     struct net_device *bond_dev = xs->xso.dev;
0426     struct bond_ipsec *ipsec;
0427     struct bonding *bond;
0428     struct slave *slave;
0429     int err;
0430
0431     if (!bond_dev)
0432         return -EINVAL;
0433
0434     rcu_read_lock();
0435     bond = netdev_priv(bond_dev);
0436     slave = rcu_dereference(bond->curr_active_slave);
0437     if (!slave) {
0438         rcu_read_unlock();
0439         return -ENODEV;
0440     }
0441
0442     if (!slave->dev->xfrmdev_ops ||
0443         !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
0444         netif_is_bond_master(slave->dev)) {
0445         slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
0446         rcu_read_unlock();
0447         return -EINVAL;
0448     }
0449
0450     ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC);
0451     if (!ipsec) {
0452         rcu_read_unlock();
0453         return -ENOMEM;
0454     }
0455     xs->xso.real_dev = slave->dev;
0456
0457     err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
0458     if (!err) {
0459         ipsec->xs = xs;
0460         INIT_LIST_HEAD(&ipsec->list);
0461         spin_lock_bh(&bond->ipsec_lock);
0462         list_add(&ipsec->list, &bond->ipsec_list);
0463         spin_unlock_bh(&bond->ipsec_lock);
0464     } else {
0465         kfree(ipsec);
0466     }
0467     rcu_read_unlock();
0468     return err;
0469 }
0470
0471 static void bond_ipsec_add_sa_all(struct bonding *bond)
0472 {
0473     struct net_device *bond_dev = bond->dev;
0474     struct bond_ipsec *ipsec;
0475     struct slave *slave;
0476
0477     rcu_read_lock();
0478     slave = rcu_dereference(bond->curr_active_slave);
0479     if (!slave)
0480         goto out;
0481
0482     if (!slave->dev->xfrmdev_ops ||
0483         !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
0484         netif_is_bond_master(slave->dev)) {
0485         spin_lock_bh(&bond->ipsec_lock);
0486         if (!list_empty(&bond->ipsec_list))
0487             slave_warn(bond_dev, slave->dev,
0488                    "%s: no slave xdo_dev_state_add\n",
0489                    __func__);
0490         spin_unlock_bh(&bond->ipsec_lock);
0491         goto out;
0492     }
0493
0494     spin_lock_bh(&bond->ipsec_lock);
0495     list_for_each_entry(ipsec, &bond->ipsec_list, list) {
0496         ipsec->xs->xso.real_dev = slave->dev;
0497         if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) {
0498             slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__);
0499             ipsec->xs->xso.real_dev = NULL;
0500         }
0501     }
0502     spin_unlock_bh(&bond->ipsec_lock);
0503 out:
0504     rcu_read_unlock();
0505 }
0506
0507 /**
0508  * bond_ipsec_del_sa - clear out this specific SA
0509  * @xs: pointer to transformer state struct
0510  **/
0511 static void bond_ipsec_del_sa(struct xfrm_state *xs)
0512 {
0513     struct net_device *bond_dev = xs->xso.dev;
0514     struct bond_ipsec *ipsec;
0515     struct bonding *bond;
0516     struct slave *slave;
0517
0518     if (!bond_dev)
0519         return;
0520
0521     rcu_read_lock();
0522     bond = netdev_priv(bond_dev);
0523     slave = rcu_dereference(bond->curr_active_slave);
0524
0525     if (!slave)
0526         goto out;
0527
0528     if (!xs->xso.real_dev)
0529         goto out;
0530
0531     WARN_ON(xs->xso.real_dev != slave->dev);
0532
0533     if (!slave->dev->xfrmdev_ops ||
0534         !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
0535         netif_is_bond_master(slave->dev)) {
0536         slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
0537         goto out;
0538     }
0539
0540     slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
0541 out:
0542     spin_lock_bh(&bond->ipsec_lock);
0543     list_for_each_entry(ipsec, &bond->ipsec_list, list) {
0544         if (ipsec->xs == xs) {
0545             list_del(&ipsec->list);
0546             kfree(ipsec);
0547             break;
0548         }
0549     }
0550     spin_unlock_bh(&bond->ipsec_lock);
0551     rcu_read_unlock();
0552 }
0553
0554 static void bond_ipsec_del_sa_all(struct bonding *bond)
0555 {
0556     struct net_device *bond_dev = bond->dev;
0557     struct bond_ipsec *ipsec;
0558     struct slave *slave;
0559
0560     rcu_read_lock();
0561     slave = rcu_dereference(bond->curr_active_slave);
0562     if (!slave) {
0563         rcu_read_unlock();
0564         return;
0565     }
0566
0567     spin_lock_bh(&bond->ipsec_lock);
0568     list_for_each_entry(ipsec, &bond->ipsec_list, list) {
0569         if (!ipsec->xs->xso.real_dev)
0570             continue;
0571
0572         if (!slave->dev->xfrmdev_ops ||
0573             !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
0574             netif_is_bond_master(slave->dev)) {
0575             slave_warn(bond_dev, slave->dev,
0576                    "%s: no slave xdo_dev_state_delete\n",
0577                    __func__);
0578         } else {
0579             slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
0580         }
0581         ipsec->xs->xso.real_dev = NULL;
0582     }
0583     spin_unlock_bh(&bond->ipsec_lock);
0584     rcu_read_unlock();
0585 }
0586
0587 /**
0588  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
0589  * @skb: current data packet
0590  * @xs: pointer to transformer state struct
0591  **/
0592 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
0593 {
0594     struct net_device *bond_dev = xs->xso.dev;
0595     struct net_device *real_dev;
0596     struct slave *curr_active;
0597     struct bonding *bond;
0598     int err;
0599
0600     bond = netdev_priv(bond_dev);
0601     rcu_read_lock();
0602     curr_active = rcu_dereference(bond->curr_active_slave);
0603     real_dev = curr_active->dev;
0604
0605     if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
0606         err = false;
0607         goto out;
0608     }
0609
0610     if (!xs->xso.real_dev) {
0611         err = false;
0612         goto out;
0613     }
0614
0615     if (!real_dev->xfrmdev_ops ||
0616         !real_dev->xfrmdev_ops->xdo_dev_offload_ok ||
0617         netif_is_bond_master(real_dev)) {
0618         err = false;
0619         goto out;
0620     }
0621
0622     err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
0623 out:
0624     rcu_read_unlock();
0625     return err;
0626 }
0627
0628 static const struct xfrmdev_ops bond_xfrmdev_ops = {
0629     .xdo_dev_state_add = bond_ipsec_add_sa,
0630     .xdo_dev_state_delete = bond_ipsec_del_sa,
0631     .xdo_dev_offload_ok = bond_ipsec_offload_ok,
0632 };
0633 #endif /* CONFIG_XFRM_OFFLOAD */
0634
0635 /*------------------------------- Link status -------------------------------*/
0636
0637 /* Set the carrier state for the master according to the state of its
0638  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
0639  * do special 802.3ad magic.
0640  *
0641  * Returns zero if carrier state does not change, nonzero if it does.
0642  */
0643 int bond_set_carrier(struct bonding *bond)
0644 {
0645     struct list_head *iter;
0646     struct slave *slave;
0647
0648     if (!bond_has_slaves(bond))
0649         goto down;
0650
0651     if (BOND_MODE(bond) == BOND_MODE_8023AD)
0652         return bond_3ad_set_carrier(bond);
0653
0654     bond_for_each_slave(bond, slave, iter) {
0655         if (slave->link == BOND_LINK_UP) {
0656             if (!netif_carrier_ok(bond->dev)) {
0657                 netif_carrier_on(bond->dev);
0658                 return 1;
0659             }
0660             return 0;
0661         }
0662     }
0663
0664 down:
0665     if (netif_carrier_ok(bond->dev)) {
0666         netif_carrier_off(bond->dev);
0667         return 1;
0668     }
0669     return 0;
0670 }
0671
0672 /* Get link speed and duplex from the slave's base driver
0673  * using ethtool. If for some reason the call fails or the
0674  * values are invalid, set speed and duplex to -1,
0675  * and return. Return 1 if speed or duplex settings are
0676  * UNKNOWN; 0 otherwise.
0677  */
0678 static int bond_update_speed_duplex(struct slave *slave)
0679 {
0680     struct net_device *slave_dev = slave->dev;
0681     struct ethtool_link_ksettings ecmd;
0682     int res;
0683
0684     slave->speed = SPEED_UNKNOWN;
0685     slave->duplex = DUPLEX_UNKNOWN;
0686
0687     res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
0688     if (res < 0)
0689         return 1;
0690     if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
0691         return 1;
0692     switch (ecmd.base.duplex) {
0693     case DUPLEX_FULL:
0694     case DUPLEX_HALF:
0695         break;
0696     default:
0697         return 1;
0698     }
0699
0700     slave->speed = ecmd.base.speed;
0701     slave->duplex = ecmd.base.duplex;
0702
0703     return 0;
0704 }
0705
0706 const char *bond_slave_link_status(s8 link)
0707 {
0708     switch (link) {
0709     case BOND_LINK_UP:
0710         return "up";
0711     case BOND_LINK_FAIL:
0712         return "going down";
0713     case BOND_LINK_DOWN:
0714         return "down";
0715     case BOND_LINK_BACK:
0716         return "going back";
0717     default:
0718         return "unknown";
0719     }
0720 }
0721
0722 /* if <dev> supports MII link status reporting, check its link status.
0723  *
0724  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
0725  * depending upon the setting of the use_carrier parameter.
0726  *
0727  * Return either BMSR_LSTATUS, meaning that the link is up (or we
0728  * can't tell and just pretend it is), or 0, meaning that the link is
0729  * down.
0730  *
0731  * If reporting is non-zero, instead of faking link up, return -1 if
0732  * both ETHTOOL and MII ioctls fail (meaning the device does not
0733  * support them).  If use_carrier is set, return whatever it says.
0734  * It'd be nice if there was a good way to tell if a driver supports
0735  * netif_carrier, but there really isn't.
0736  */
0737 static int bond_check_dev_link(struct bonding *bond,
0738                    struct net_device *slave_dev, int reporting)
0739 {
0740     const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
0741     int (*ioctl)(struct net_device *, struct ifreq *, int);
0742     struct ifreq ifr;
0743     struct mii_ioctl_data *mii;
0744
0745     if (!reporting && !netif_running(slave_dev))
0746         return 0;
0747
0748     if (bond->params.use_carrier)
0749         return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
0750
0751     /* Try to get link status using Ethtool first. */
0752     if (slave_dev->ethtool_ops->get_link)
0753         return slave_dev->ethtool_ops->get_link(slave_dev) ?
0754             BMSR_LSTATUS : 0;
0755
0756     /* Ethtool can't be used, fallback to MII ioctls. */
0757     ioctl = slave_ops->ndo_eth_ioctl;
0758     if (ioctl) {
0759         /* TODO: set pointer to correct ioctl on a per team member
0760          *       bases to make this more efficient. that is, once
0761          *       we determine the correct ioctl, we will always
0762          *       call it and not the others for that team
0763          *       member.
0764          */
0765
0766         /* We cannot assume that SIOCGMIIPHY will also read a
0767          * register; not all network drivers (e.g., e100)
0768          * support that.
0769          */
0770
0771         /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
0772         strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
0773         mii = if_mii(&ifr);
0774         if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
0775             mii->reg_num = MII_BMSR;
0776             if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
0777                 return mii->val_out & BMSR_LSTATUS;
0778         }
0779     }
0780
0781     /* If reporting, report that either there's no ndo_eth_ioctl,
0782      * or both SIOCGMIIREG and get_link failed (meaning that we
0783      * cannot report link status).  If not reporting, pretend
0784      * we're ok.
0785      */
0786     return reporting ? -1 : BMSR_LSTATUS;
0787 }
0788
0789 /*----------------------------- Multicast list ------------------------------*/
0790
0791 /* Push the promiscuity flag down to appropriate slaves */
0792 static int bond_set_promiscuity(struct bonding *bond, int inc)
0793 {
0794     struct list_head *iter;
0795     int err = 0;
0796
0797     if (bond_uses_primary(bond)) {
0798         struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
0799
0800         if (curr_active)
0801             err = dev_set_promiscuity(curr_active->dev, inc);
0802     } else {
0803         struct slave *slave;
0804
0805         bond_for_each_slave(bond, slave, iter) {
0806             err = dev_set_promiscuity(slave->dev, inc);
0807             if (err)
0808                 return err;
0809         }
0810     }
0811     return err;
0812 }
0813
0814 /* Push the allmulti flag down to all slaves */
0815 static int bond_set_allmulti(struct bonding *bond, int inc)
0816 {
0817     struct list_head *iter;
0818     int err = 0;
0819
0820     if (bond_uses_primary(bond)) {
0821         struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
0822
0823         if (curr_active)
0824             err = dev_set_allmulti(curr_active->dev, inc);
0825     } else {
0826         struct slave *slave;
0827
0828         bond_for_each_slave(bond, slave, iter) {
0829             err = dev_set_allmulti(slave->dev, inc);
0830             if (err)
0831                 return err;
0832         }
0833     }
0834     return err;
0835 }
0836
0837 /* Retrieve the list of registered multicast addresses for the bonding
0838  * device and retransmit an IGMP JOIN request to the current active
0839  * slave.
0840  */
0841 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
0842 {
0843     struct bonding *bond = container_of(work, struct bonding,
0844                         mcast_work.work);
0845
0846     if (!rtnl_trylock()) {
0847         queue_delayed_work(bond->wq, &bond->mcast_work, 1);
0848         return;
0849     }
0850     call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
0851
0852     if (bond->igmp_retrans > 1) {
0853         bond->igmp_retrans--;
0854         queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
0855     }
0856     rtnl_unlock();
0857 }
0858
0859 /* Flush bond's hardware addresses from slave */
0860 static void bond_hw_addr_flush(struct net_device *bond_dev,
0861                    struct net_device *slave_dev)
0862 {
0863     struct bonding *bond = netdev_priv(bond_dev);
0864
0865     dev_uc_unsync(slave_dev, bond_dev);
0866     dev_mc_unsync(slave_dev, bond_dev);
0867
0868     if (BOND_MODE(bond) == BOND_MODE_8023AD)
0869         dev_mc_del(slave_dev, lacpdu_mcast_addr);
0870 }
0871
0872 /*--------------------------- Active slave change ---------------------------*/
0873
0874 /* Update the hardware address list and promisc/allmulti for the new and
0875  * old active slaves (if any).  Modes that are not using primary keep all
0876  * slaves up date at all times; only the modes that use primary need to call
0877  * this function to swap these settings during a failover.
0878  */
0879 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
0880                   struct slave *old_active)
0881 {
0882     if (old_active) {
0883         if (bond->dev->flags & IFF_PROMISC)
0884             dev_set_promiscuity(old_active->dev, -1);
0885
0886         if (bond->dev->flags & IFF_ALLMULTI)
0887             dev_set_allmulti(old_active->dev, -1);
0888
0889         if (bond->dev->flags & IFF_UP)
0890             bond_hw_addr_flush(bond->dev, old_active->dev);
0891     }
0892
0893     if (new_active) {
0894         /* FIXME: Signal errors upstream. */
0895         if (bond->dev->flags & IFF_PROMISC)
0896             dev_set_promiscuity(new_active->dev, 1);
0897
0898         if (bond->dev->flags & IFF_ALLMULTI)
0899             dev_set_allmulti(new_active->dev, 1);
0900
0901         if (bond->dev->flags & IFF_UP) {
0902             netif_addr_lock_bh(bond->dev);
0903             dev_uc_sync(new_active->dev, bond->dev);
0904             dev_mc_sync(new_active->dev, bond->dev);
0905             netif_addr_unlock_bh(bond->dev);
0906         }
0907     }
0908 }
0909
0910 /**
0911  * bond_set_dev_addr - clone slave's address to bond
0912  * @bond_dev: bond net device
0913  * @slave_dev: slave net device
0914  *
0915  * Should be called with RTNL held.
0916  */
0917 static int bond_set_dev_addr(struct net_device *bond_dev,
0918                  struct net_device *slave_dev)
0919 {
0920     int err;
0921
0922     slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
0923           bond_dev, slave_dev, slave_dev->addr_len);
0924     err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
0925     if (err)
0926         return err;
0927
0928     __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len);
0929     bond_dev->addr_assign_type = NET_ADDR_STOLEN;
0930     call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
0931     return 0;
0932 }
0933
0934 static struct slave *bond_get_old_active(struct bonding *bond,
0935                      struct slave *new_active)
0936 {
0937     struct slave *slave;
0938     struct list_head *iter;
0939
0940     bond_for_each_slave(bond, slave, iter) {
0941         if (slave == new_active)
0942             continue;
0943
0944         if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
0945             return slave;
0946     }
0947
0948     return NULL;
0949 }
0950
0951 /* bond_do_fail_over_mac
0952  *
0953  * Perform special MAC address swapping for fail_over_mac settings
0954  *
0955  * Called with RTNL
0956  */
0957 static void bond_do_fail_over_mac(struct bonding *bond,
0958                   struct slave *new_active,
0959                   struct slave *old_active)
0960 {
0961     u8 tmp_mac[MAX_ADDR_LEN];
0962     struct sockaddr_storage ss;
0963     int rv;
0964
0965     switch (bond->params.fail_over_mac) {
0966     case BOND_FOM_ACTIVE:
0967         if (new_active) {
0968             rv = bond_set_dev_addr(bond->dev, new_active->dev);
0969             if (rv)
0970                 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
0971                       -rv);
0972         }
0973         break;
0974     case BOND_FOM_FOLLOW:
0975         /* if new_active && old_active, swap them
0976          * if just old_active, do nothing (going to no active slave)
0977          * if just new_active, set new_active to bond's MAC
0978          */
0979         if (!new_active)
0980             return;
0981
0982         if (!old_active)
0983             old_active = bond_get_old_active(bond, new_active);
0984
0985         if (old_active) {
0986             bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
0987                       new_active->dev->addr_len);
0988             bond_hw_addr_copy(ss.__data,
0989                       old_active->dev->dev_addr,
0990                       old_active->dev->addr_len);
0991             ss.ss_family = new_active->dev->type;
0992         } else {
0993             bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
0994                       bond->dev->addr_len);
0995             ss.ss_family = bond->dev->type;
0996         }
0997
0998         rv = dev_set_mac_address(new_active->dev,
0999                      (struct sockaddr *)&ss, NULL);
1000         if (rv) {
1001             slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
1002                   -rv);
1003             goto out;
1004         }
1005
1006         if (!old_active)
1007             goto out;
1008
1009         bond_hw_addr_copy(ss.__data, tmp_mac,
1010                   new_active->dev->addr_len);
1011         ss.ss_family = old_active->dev->type;
1012
1013         rv = dev_set_mac_address(old_active->dev,
1014                      (struct sockaddr *)&ss, NULL);
1015         if (rv)
1016             slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
1017                   -rv);
1018 out:
1019         break;
1020     default:
1021         netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
1022                bond->params.fail_over_mac);
1023         break;
1024     }
1025
1026 }
1027
1028 /**
1029  * bond_choose_primary_or_current - select the primary or high priority slave
1030  * @bond: our bonding struct
1031  *
1032  * - Check if there is a primary link. If the primary link was set and is up,
1033  *   go on and do link reselection.
1034  *
1035  * - If primary link is not set or down, find the highest priority link.
1036  *   If the highest priority link is not current slave, set it as primary
1037  *   link and do link reselection.
1038  */
1039 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
1040 {
1041     struct slave *prim = rtnl_dereference(bond->primary_slave);
1042     struct slave *curr = rtnl_dereference(bond->curr_active_slave);
1043     struct slave *slave, *hprio = NULL;
1044     struct list_head *iter;
1045
1046     if (!prim || prim->link != BOND_LINK_UP) {
1047         bond_for_each_slave(bond, slave, iter) {
1048             if (slave->link == BOND_LINK_UP) {
1049                 hprio = hprio ?: slave;
1050                 if (slave->prio > hprio->prio)
1051                     hprio = slave;
1052             }
1053         }
1054
1055         if (hprio && hprio != curr) {
1056             prim = hprio;
1057             goto link_reselect;
1058         }
1059
1060         if (!curr || curr->link != BOND_LINK_UP)
1061             return NULL;
1062         return curr;
1063     }
1064
1065     if (bond->force_primary) {
1066         bond->force_primary = false;
1067         return prim;
1068     }
1069
1070 link_reselect:
1071     if (!curr || curr->link != BOND_LINK_UP)
1072         return prim;
1073
1074     /* At this point, prim and curr are both up */
1075     switch (bond->params.primary_reselect) {
1076     case BOND_PRI_RESELECT_ALWAYS:
1077         return prim;
1078     case BOND_PRI_RESELECT_BETTER:
1079         if (prim->speed < curr->speed)
1080             return curr;
1081         if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
1082             return curr;
1083         return prim;
1084     case BOND_PRI_RESELECT_FAILURE:
1085         return curr;
1086     default:
1087         netdev_err(bond->dev, "impossible primary_reselect %d\n",
1088                bond->params.primary_reselect);
1089         return curr;
1090     }
1091 }
1092
1093 /**
1094  * bond_find_best_slave - select the best available slave to be the active one
1095  * @bond: our bonding struct
1096  */
1097 static struct slave *bond_find_best_slave(struct bonding *bond)
1098 {
1099     struct slave *slave, *bestslave = NULL;
1100     struct list_head *iter;
1101     int mintime = bond->params.updelay;
1102
1103     slave = bond_choose_primary_or_current(bond);
1104     if (slave)
1105         return slave;
1106
1107     bond_for_each_slave(bond, slave, iter) {
1108         if (slave->link == BOND_LINK_UP)
1109             return slave;
1110         if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
1111             slave->delay < mintime) {
1112             mintime = slave->delay;
1113             bestslave = slave;
1114         }
1115     }
1116
1117     return bestslave;
1118 }
1119
1120 static bool bond_should_notify_peers(struct bonding *bond)
1121 {
1122     struct slave *slave;
1123
1124     rcu_read_lock();
1125     slave = rcu_dereference(bond->curr_active_slave);
1126     rcu_read_unlock();
1127
1128     if (!slave || !bond->send_peer_notif ||
1129         bond->send_peer_notif %
1130         max(1, bond->params.peer_notif_delay) != 0 ||
1131         !netif_carrier_ok(bond->dev) ||
1132         test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1133         return false;
1134
1135     netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
1136            slave ? slave->dev->name : "NULL");
1137
1138     return true;
1139 }
1140
1141 /**
1142  * bond_change_active_slave - change the active slave into the specified one
1143  * @bond: our bonding struct
1144  * @new_active: the new slave to make the active one
1145  *
1146  * Set the new slave to the bond's settings and unset them on the old
1147  * curr_active_slave.
1148  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1149  *
1150  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1151  * because it is apparently the best available slave we have, even though its
1152  * updelay hasn't timed out yet.
1153  *
1154  * Caller must hold RTNL.
1155  */
1156 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1157 {
1158     struct slave *old_active;
1159
1160     ASSERT_RTNL();
1161
1162     old_active = rtnl_dereference(bond->curr_active_slave);
1163
1164     if (old_active == new_active)
1165         return;
1166
1167 #ifdef CONFIG_XFRM_OFFLOAD
1168     bond_ipsec_del_sa_all(bond);
1169 #endif /* CONFIG_XFRM_OFFLOAD */
1170
1171     if (new_active) {
1172         new_active->last_link_up = jiffies;
1173
1174         if (new_active->link == BOND_LINK_BACK) {
1175             if (bond_uses_primary(bond)) {
1176                 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1177                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1178             }
1179
1180             new_active->delay = 0;
1181             bond_set_slave_link_state(new_active, BOND_LINK_UP,
1182                           BOND_SLAVE_NOTIFY_NOW);
1183
1184             if (BOND_MODE(bond) == BOND_MODE_8023AD)
1185                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1186
1187             if (bond_is_lb(bond))
1188                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1189         } else {
1190             if (bond_uses_primary(bond))
1191                 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1192         }
1193     }
1194
1195     if (bond_uses_primary(bond))
1196         bond_hw_addr_swap(bond, new_active, old_active);
1197
1198     if (bond_is_lb(bond)) {
1199         bond_alb_handle_active_change(bond, new_active);
1200         if (old_active)
1201             bond_set_slave_inactive_flags(old_active,
1202                               BOND_SLAVE_NOTIFY_NOW);
1203         if (new_active)
1204             bond_set_slave_active_flags(new_active,
1205                             BOND_SLAVE_NOTIFY_NOW);
1206     } else {
1207         rcu_assign_pointer(bond->curr_active_slave, new_active);
1208     }
1209
1210     if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1211         if (old_active)
1212             bond_set_slave_inactive_flags(old_active,
1213                               BOND_SLAVE_NOTIFY_NOW);
1214
1215         if (new_active) {
1216             bool should_notify_peers = false;
1217
1218             bond_set_slave_active_flags(new_active,
1219                             BOND_SLAVE_NOTIFY_NOW);
1220
1221             if (bond->params.fail_over_mac)
1222                 bond_do_fail_over_mac(bond, new_active,
1223                               old_active);
1224
1225             if (netif_running(bond->dev)) {
1226                 bond->send_peer_notif =
1227                     bond->params.num_peer_notif *
1228                     max(1, bond->params.peer_notif_delay);
1229                 should_notify_peers =
1230                     bond_should_notify_peers(bond);
1231             }
1232
1233             call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1234             if (should_notify_peers) {
1235                 bond->send_peer_notif--;
1236                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1237                              bond->dev);
1238             }
1239         }
1240     }
1241
1242 #ifdef CONFIG_XFRM_OFFLOAD
1243     bond_ipsec_add_sa_all(bond);
1244 #endif /* CONFIG_XFRM_OFFLOAD */
1245
1246     /* resend IGMP joins since active slave has changed or
1247      * all were sent on curr_active_slave.
1248      * resend only if bond is brought up with the affected
1249      * bonding modes and the retransmission is enabled
1250      */
1251     if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1252         ((bond_uses_primary(bond) && new_active) ||
1253          BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1254         bond->igmp_retrans = bond->params.resend_igmp;
1255         queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1256     }
1257 }
1258
1259 /**
1260  * bond_select_active_slave - select a new active slave, if needed
1261  * @bond: our bonding struct
1262  *
1263  * This functions should be called when one of the following occurs:
1264  * - The old curr_active_slave has been released or lost its link.
1265  * - The primary_slave has got its link back.
1266  * - A slave has got its link back and there's no old curr_active_slave.
1267  *
1268  * Caller must hold RTNL.
1269  */
1270 void bond_select_active_slave(struct bonding *bond)
1271 {
1272     struct slave *best_slave;
1273     int rv;
1274
1275     ASSERT_RTNL();
1276
1277     best_slave = bond_find_best_slave(bond);
1278     if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1279         bond_change_active_slave(bond, best_slave);
1280         rv = bond_set_carrier(bond);
1281         if (!rv)
1282             return;
1283
1284         if (netif_carrier_ok(bond->dev))
1285             netdev_info(bond->dev, "active interface up!\n");
1286         else
1287             netdev_info(bond->dev, "now running without any active interface!\n");
1288     }
1289 }
1290
1291 #ifdef CONFIG_NET_POLL_CONTROLLER
1292 static inline int slave_enable_netpoll(struct slave *slave)
1293 {
1294     struct netpoll *np;
1295     int err = 0;
1296
1297     np = kzalloc(sizeof(*np), GFP_KERNEL);
1298     err = -ENOMEM;
1299     if (!np)
1300         goto out;
1301
1302     err = __netpoll_setup(np, slave->dev);
1303     if (err) {
1304         kfree(np);
1305         goto out;
1306     }
1307     slave->np = np;
1308 out:
1309     return err;
1310 }
1311 static inline void slave_disable_netpoll(struct slave *slave)
1312 {
1313     struct netpoll *np = slave->np;
1314
1315     if (!np)
1316         return;
1317
1318     slave->np = NULL;
1319
1320     __netpoll_free(np);
1321 }
1322
1323 static void bond_poll_controller(struct net_device *bond_dev)
1324 {
1325     struct bonding *bond = netdev_priv(bond_dev);
1326     struct slave *slave = NULL;
1327     struct list_head *iter;
1328     struct ad_info ad_info;
1329
1330     if (BOND_MODE(bond) == BOND_MODE_8023AD)
1331         if (bond_3ad_get_active_agg_info(bond, &ad_info))
1332             return;
1333
1334     bond_for_each_slave_rcu(bond, slave, iter) {
1335         if (!bond_slave_is_up(slave))
1336             continue;
1337
1338         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1339             struct aggregator *agg =
1340                 SLAVE_AD_INFO(slave)->port.aggregator;
1341
1342             if (agg &&
1343                 agg->aggregator_identifier != ad_info.aggregator_id)
1344                 continue;
1345         }
1346
1347         netpoll_poll_dev(slave->dev);
1348     }
1349 }
1350
1351 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1352 {
1353     struct bonding *bond = netdev_priv(bond_dev);
1354     struct list_head *iter;
1355     struct slave *slave;
1356
1357     bond_for_each_slave(bond, slave, iter)
1358         if (bond_slave_is_up(slave))
1359             slave_disable_netpoll(slave);
1360 }
1361
1362 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1363 {
1364     struct bonding *bond = netdev_priv(dev);
1365     struct list_head *iter;
1366     struct slave *slave;
1367     int err = 0;
1368
1369     bond_for_each_slave(bond, slave, iter) {
1370         err = slave_enable_netpoll(slave);
1371         if (err) {
1372             bond_netpoll_cleanup(dev);
1373             break;
1374         }
1375     }
1376     return err;
1377 }
1378 #else
1379 static inline int slave_enable_netpoll(struct slave *slave)
1380 {
1381     return 0;
1382 }
1383 static inline void slave_disable_netpoll(struct slave *slave)
1384 {
1385 }
1386 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1387 {
1388 }
1389 #endif
1390
1391 /*---------------------------------- IOCTL ----------------------------------*/
1392
1393 static netdev_features_t bond_fix_features(struct net_device *dev,
1394                        netdev_features_t features)
1395 {
1396     struct bonding *bond = netdev_priv(dev);
1397     struct list_head *iter;
1398     netdev_features_t mask;
1399     struct slave *slave;
1400
1401 #if IS_ENABLED(CONFIG_TLS_DEVICE)
1402     if (bond_sk_check(bond))
1403         features |= BOND_TLS_FEATURES;
1404     else
1405         features &= ~BOND_TLS_FEATURES;
1406 #endif
1407
1408     mask = features;
1409
1410     features &= ~NETIF_F_ONE_FOR_ALL;
1411     features |= NETIF_F_ALL_FOR_ALL;
1412
1413     bond_for_each_slave(bond, slave, iter) {
1414         features = netdev_increment_features(features,
1415                              slave->dev->features,
1416                              mask);
1417     }
1418     features = netdev_add_tso_features(features, mask);
1419
1420     return features;
1421 }
1422
1423 #define BOND_VLAN_FEATURES  (NETIF_F_HW_CSUM | NETIF_F_SG | \
1424                  NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1425                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1426
1427 #define BOND_ENC_FEATURES   (NETIF_F_HW_CSUM | NETIF_F_SG | \
1428                  NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
1429
1430 #define BOND_MPLS_FEATURES  (NETIF_F_HW_CSUM | NETIF_F_SG | \
1431                  NETIF_F_GSO_SOFTWARE)
1432
1433
1434 static void bond_compute_features(struct bonding *bond)
1435 {
1436     unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1437                     IFF_XMIT_DST_RELEASE_PERM;
1438     netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1439     netdev_features_t enc_features  = BOND_ENC_FEATURES;
1440 #ifdef CONFIG_XFRM_OFFLOAD
1441     netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1442 #endif /* CONFIG_XFRM_OFFLOAD */
1443     netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1444     struct net_device *bond_dev = bond->dev;
1445     struct list_head *iter;
1446     struct slave *slave;
1447     unsigned short max_hard_header_len = ETH_HLEN;
1448     unsigned int tso_max_size = TSO_MAX_SIZE;
1449     u16 tso_max_segs = TSO_MAX_SEGS;
1450
1451     if (!bond_has_slaves(bond))
1452         goto done;
1453     vlan_features &= NETIF_F_ALL_FOR_ALL;
1454     mpls_features &= NETIF_F_ALL_FOR_ALL;
1455
1456     bond_for_each_slave(bond, slave, iter) {
1457         vlan_features = netdev_increment_features(vlan_features,
1458             slave->dev->vlan_features, BOND_VLAN_FEATURES);
1459
1460         enc_features = netdev_increment_features(enc_features,
1461                              slave->dev->hw_enc_features,
1462                              BOND_ENC_FEATURES);
1463
1464 #ifdef CONFIG_XFRM_OFFLOAD
1465         xfrm_features = netdev_increment_features(xfrm_features,
1466                               slave->dev->hw_enc_features,
1467                               BOND_XFRM_FEATURES);
1468 #endif /* CONFIG_XFRM_OFFLOAD */
1469
1470         mpls_features = netdev_increment_features(mpls_features,
1471                               slave->dev->mpls_features,
1472                               BOND_MPLS_FEATURES);
1473
1474         dst_release_flag &= slave->dev->priv_flags;
1475         if (slave->dev->hard_header_len > max_hard_header_len)
1476             max_hard_header_len = slave->dev->hard_header_len;
1477
1478         tso_max_size = min(tso_max_size, slave->dev->tso_max_size);
1479         tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs);
1480     }
1481     bond_dev->hard_header_len = max_hard_header_len;
1482
1483 done:
1484     bond_dev->vlan_features = vlan_features;
1485     bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1486                     NETIF_F_HW_VLAN_CTAG_TX |
1487                     NETIF_F_HW_VLAN_STAG_TX;
1488 #ifdef CONFIG_XFRM_OFFLOAD
1489     bond_dev->hw_enc_features |= xfrm_features;
1490 #endif /* CONFIG_XFRM_OFFLOAD */
1491     bond_dev->mpls_features = mpls_features;
1492     netif_set_tso_max_segs(bond_dev, tso_max_segs);
1493     netif_set_tso_max_size(bond_dev, tso_max_size);
1494
1495     bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1496     if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1497         dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1498         bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1499
1500     netdev_change_features(bond_dev);
1501 }
1502
1503 static void bond_setup_by_slave(struct net_device *bond_dev,
1504                 struct net_device *slave_dev)
1505 {
1506     bond_dev->header_ops        = slave_dev->header_ops;
1507
1508     bond_dev->type          = slave_dev->type;
1509     bond_dev->hard_header_len   = slave_dev->hard_header_len;
1510     bond_dev->needed_headroom   = slave_dev->needed_headroom;
1511     bond_dev->addr_len      = slave_dev->addr_len;
1512
1513     memcpy(bond_dev->broadcast, slave_dev->broadcast,
1514         slave_dev->addr_len);
1515 }
1516
1517 /* On bonding slaves other than the currently active slave, suppress
1518  * duplicates except for alb non-mcast/bcast.
1519  */
1520 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1521                         struct slave *slave,
1522                         struct bonding *bond)
1523 {
1524     if (bond_is_slave_inactive(slave)) {
1525         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1526             skb->pkt_type != PACKET_BROADCAST &&
1527             skb->pkt_type != PACKET_MULTICAST)
1528             return false;
1529         return true;
1530     }
1531     return false;
1532 }
1533
1534 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1535 {
1536     struct sk_buff *skb = *pskb;
1537     struct slave *slave;
1538     struct bonding *bond;
1539     int (*recv_probe)(const struct sk_buff *, struct bonding *,
1540               struct slave *);
1541     int ret = RX_HANDLER_ANOTHER;
1542
1543     skb = skb_share_check(skb, GFP_ATOMIC);
1544     if (unlikely(!skb))
1545         return RX_HANDLER_CONSUMED;
1546
1547     *pskb = skb;
1548
1549     slave = bond_slave_get_rcu(skb->dev);
1550     bond = slave->bond;
1551
1552     recv_probe = READ_ONCE(bond->recv_probe);
1553     if (recv_probe) {
1554         ret = recv_probe(skb, bond, slave);
1555         if (ret == RX_HANDLER_CONSUMED) {
1556             consume_skb(skb);
1557             return ret;
1558         }
1559     }
1560
1561     /*
1562      * For packets determined by bond_should_deliver_exact_match() call to
1563      * be suppressed we want to make an exception for link-local packets.
1564      * This is necessary for e.g. LLDP daemons to be able to monitor
1565      * inactive slave links without being forced to bind to them
1566      * explicitly.
1567      *
1568      * At the same time, packets that are passed to the bonding master
1569      * (including link-local ones) can have their originating interface
1570      * determined via PACKET_ORIGDEV socket option.
1571      */
1572     if (bond_should_deliver_exact_match(skb, slave, bond)) {
1573         if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1574             return RX_HANDLER_PASS;
1575         return RX_HANDLER_EXACT;
1576     }
1577
1578     skb->dev = bond->dev;
1579
1580     if (BOND_MODE(bond) == BOND_MODE_ALB &&
1581         netif_is_bridge_port(bond->dev) &&
1582         skb->pkt_type == PACKET_HOST) {
1583
1584         if (unlikely(skb_cow_head(skb,
1585                       skb->data - skb_mac_header(skb)))) {
1586             kfree_skb(skb);
1587             return RX_HANDLER_CONSUMED;
1588         }
1589         bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1590                   bond->dev->addr_len);
1591     }
1592
1593     return ret;
1594 }
1595
1596 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1597 {
1598     switch (BOND_MODE(bond)) {
1599     case BOND_MODE_ROUNDROBIN:
1600         return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1601     case BOND_MODE_ACTIVEBACKUP:
1602         return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1603     case BOND_MODE_BROADCAST:
1604         return NETDEV_LAG_TX_TYPE_BROADCAST;
1605     case BOND_MODE_XOR:
1606     case BOND_MODE_8023AD:
1607         return NETDEV_LAG_TX_TYPE_HASH;
1608     default:
1609         return NETDEV_LAG_TX_TYPE_UNKNOWN;
1610     }
1611 }
1612
1613 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1614                            enum netdev_lag_tx_type type)
1615 {
1616     if (type != NETDEV_LAG_TX_TYPE_HASH)
1617         return NETDEV_LAG_HASH_NONE;
1618
1619     switch (bond->params.xmit_policy) {
1620     case BOND_XMIT_POLICY_LAYER2:
1621         return NETDEV_LAG_HASH_L2;
1622     case BOND_XMIT_POLICY_LAYER34:
1623         return NETDEV_LAG_HASH_L34;
1624     case BOND_XMIT_POLICY_LAYER23:
1625         return NETDEV_LAG_HASH_L23;
1626     case BOND_XMIT_POLICY_ENCAP23:
1627         return NETDEV_LAG_HASH_E23;
1628     case BOND_XMIT_POLICY_ENCAP34:
1629         return NETDEV_LAG_HASH_E34;
1630     case BOND_XMIT_POLICY_VLAN_SRCMAC:
1631         return NETDEV_LAG_HASH_VLAN_SRCMAC;
1632     default:
1633         return NETDEV_LAG_HASH_UNKNOWN;
1634     }
1635 }
1636
1637 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1638                       struct netlink_ext_ack *extack)
1639 {
1640     struct netdev_lag_upper_info lag_upper_info;
1641     enum netdev_lag_tx_type type;
1642
1643     type = bond_lag_tx_type(bond);
1644     lag_upper_info.tx_type = type;
1645     lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1646
1647     return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1648                         &lag_upper_info, extack);
1649 }
1650
1651 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1652 {
1653     netdev_upper_dev_unlink(slave->dev, bond->dev);
1654     slave->dev->flags &= ~IFF_SLAVE;
1655 }
1656
1657 static void slave_kobj_release(struct kobject *kobj)
1658 {
1659     struct slave *slave = to_slave(kobj);
1660     struct bonding *bond = bond_get_bond_by_slave(slave);
1661
1662     cancel_delayed_work_sync(&slave->notify_work);
1663     if (BOND_MODE(bond) == BOND_MODE_8023AD)
1664         kfree(SLAVE_AD_INFO(slave));
1665
1666     kfree(slave);
1667 }
1668
1669 static struct kobj_type slave_ktype = {
1670     .release = slave_kobj_release,
1671 #ifdef CONFIG_SYSFS
1672     .sysfs_ops = &slave_sysfs_ops,
1673 #endif
1674 };
1675
1676 static int bond_kobj_init(struct slave *slave)
1677 {
1678     int err;
1679
1680     err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1681                    &(slave->dev->dev.kobj), "bonding_slave");
1682     if (err)
1683         kobject_put(&slave->kobj);
1684
1685     return err;
1686 }
1687
1688 static struct slave *bond_alloc_slave(struct bonding *bond,
1689                       struct net_device *slave_dev)
1690 {
1691     struct slave *slave = NULL;
1692
1693     slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1694     if (!slave)
1695         return NULL;
1696
1697     slave->bond = bond;
1698     slave->dev = slave_dev;
1699     INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1700
1701     if (bond_kobj_init(slave))
1702         return NULL;
1703
1704     if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1705         SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1706                            GFP_KERNEL);
1707         if (!SLAVE_AD_INFO(slave)) {
1708             kobject_put(&slave->kobj);
1709             return NULL;
1710         }
1711     }
1712
1713     return slave;
1714 }
1715
1716 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1717 {
1718     info->bond_mode = BOND_MODE(bond);
1719     info->miimon = bond->params.miimon;
1720     info->num_slaves = bond->slave_cnt;
1721 }
1722
1723 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1724 {
1725     strcpy(info->slave_name, slave->dev->name);
1726     info->link = slave->link;
1727     info->state = bond_slave_state(slave);
1728     info->link_failure_count = slave->link_failure_count;
1729 }
1730
1731 static void bond_netdev_notify_work(struct work_struct *_work)
1732 {
1733     struct slave *slave = container_of(_work, struct slave,
1734                        notify_work.work);
1735
1736     if (rtnl_trylock()) {
1737         struct netdev_bonding_info binfo;
1738
1739         bond_fill_ifslave(slave, &binfo.slave);
1740         bond_fill_ifbond(slave->bond, &binfo.master);
1741         netdev_bonding_info_change(slave->dev, &binfo);
1742         rtnl_unlock();
1743     } else {
1744         queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1745     }
1746 }
1747
1748 void bond_queue_slave_event(struct slave *slave)
1749 {
1750     queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1751 }
1752
1753 void bond_lower_state_changed(struct slave *slave)
1754 {
1755     struct netdev_lag_lower_state_info info;
1756
1757     info.link_up = slave->link == BOND_LINK_UP ||
1758                slave->link == BOND_LINK_FAIL;
1759     info.tx_enabled = bond_is_active_slave(slave);
1760     netdev_lower_state_changed(slave->dev, &info);
1761 }
1762
1763 #define BOND_NL_ERR(bond_dev, extack, errmsg) do {      \
1764     if (extack)                     \
1765         NL_SET_ERR_MSG(extack, errmsg);         \
1766     else                            \
1767         netdev_err(bond_dev, "Error: %s\n", errmsg);    \
1768 } while (0)
1769
1770 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do {      \
1771     if (extack)                         \
1772         NL_SET_ERR_MSG(extack, errmsg);             \
1773     else                                \
1774         slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg);  \
1775 } while (0)
1776
1777 /* enslave device <slave> to bond device <master> */
1778 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1779          struct netlink_ext_ack *extack)
1780 {
1781     struct bonding *bond = netdev_priv(bond_dev);
1782     const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1783     struct slave *new_slave = NULL, *prev_slave;
1784     struct sockaddr_storage ss;
1785     int link_reporting;
1786     int res = 0, i;
1787
1788     if (slave_dev->flags & IFF_MASTER &&
1789         !netif_is_bond_master(slave_dev)) {
1790         BOND_NL_ERR(bond_dev, extack,
1791                 "Device type (master device) cannot be enslaved");
1792         return -EPERM;
1793     }
1794
1795     if (!bond->params.use_carrier &&
1796         slave_dev->ethtool_ops->get_link == NULL &&
1797         slave_ops->ndo_eth_ioctl == NULL) {
1798         slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1799     }
1800
1801     /* already in-use? */
1802     if (netdev_is_rx_handler_busy(slave_dev)) {
1803         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1804                  "Device is in use and cannot be enslaved");
1805         return -EBUSY;
1806     }
1807
1808     if (bond_dev == slave_dev) {
1809         BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself.");
1810         return -EPERM;
1811     }
1812
1813     /* vlan challenged mutual exclusion */
1814     /* no need to lock since we're protected by rtnl_lock */
1815     if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1816         slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1817         if (vlan_uses_dev(bond_dev)) {
1818             SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1819                      "Can not enslave VLAN challenged device to VLAN enabled bond");
1820             return -EPERM;
1821         } else {
1822             slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1823         }
1824     } else {
1825         slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1826     }
1827
1828     if (slave_dev->features & NETIF_F_HW_ESP)
1829         slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1830
1831     /* Old ifenslave binaries are no longer supported.  These can
1832      * be identified with moderate accuracy by the state of the slave:
1833      * the current ifenslave will set the interface down prior to
1834      * enslaving it; the old ifenslave will not.
1835      */
1836     if (slave_dev->flags & IFF_UP) {
1837         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1838                  "Device can not be enslaved while up");
1839         return -EPERM;
1840     }
1841
1842     /* set bonding device ether type by slave - bonding netdevices are
1843      * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1844      * there is a need to override some of the type dependent attribs/funcs.
1845      *
1846      * bond ether type mutual exclusion - don't allow slaves of dissimilar
1847      * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1848      */
1849     if (!bond_has_slaves(bond)) {
1850         if (bond_dev->type != slave_dev->type) {
1851             slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1852                   bond_dev->type, slave_dev->type);
1853
1854             res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1855                                bond_dev);
1856             res = notifier_to_errno(res);
1857             if (res) {
1858                 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1859                 return -EBUSY;
1860             }
1861
1862             /* Flush unicast and multicast addresses */
1863             dev_uc_flush(bond_dev);
1864             dev_mc_flush(bond_dev);
1865
1866             if (slave_dev->type != ARPHRD_ETHER)
1867                 bond_setup_by_slave(bond_dev, slave_dev);
1868             else {
1869                 ether_setup(bond_dev);
1870                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1871             }
1872
1873             call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1874                          bond_dev);
1875         }
1876     } else if (bond_dev->type != slave_dev->type) {
1877         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1878                  "Device type is different from other slaves");
1879         return -EINVAL;
1880     }
1881
1882     if (slave_dev->type == ARPHRD_INFINIBAND &&
1883         BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1884         SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1885                  "Only active-backup mode is supported for infiniband slaves");
1886         res = -EOPNOTSUPP;
1887         goto err_undo_flags;
1888     }
1889
1890     if (!slave_ops->ndo_set_mac_address ||
1891         slave_dev->type == ARPHRD_INFINIBAND) {
1892         slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1893         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1894             bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1895             if (!bond_has_slaves(bond)) {
1896                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1897                 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1898             } else {
1899                 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1900                          "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1901                 res = -EOPNOTSUPP;
1902                 goto err_undo_flags;
1903             }
1904         }
1905     }
1906
1907     call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1908
1909     /* If this is the first slave, then we need to set the master's hardware
1910      * address to be the same as the slave's.
1911      */
1912     if (!bond_has_slaves(bond) &&
1913         bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1914         res = bond_set_dev_addr(bond->dev, slave_dev);
1915         if (res)
1916             goto err_undo_flags;
1917     }
1918
1919     new_slave = bond_alloc_slave(bond, slave_dev);
1920     if (!new_slave) {
1921         res = -ENOMEM;
1922         goto err_undo_flags;
1923     }
1924
1925     /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1926      * is set via sysfs or module option if desired.
1927      */
1928     new_slave->queue_id = 0;
1929
1930     /* Save slave's original mtu and then set it to match the bond */
1931     new_slave->original_mtu = slave_dev->mtu;
1932     res = dev_set_mtu(slave_dev, bond->dev->mtu);
1933     if (res) {
1934         slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1935         goto err_free;
1936     }
1937
1938     /* Save slave's original ("permanent") mac address for modes
1939      * that need it, and for restoring it upon release, and then
1940      * set it to the master's address
1941      */
1942     bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1943               slave_dev->addr_len);
1944
1945     if (!bond->params.fail_over_mac ||
1946         BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1947         /* Set slave to master's mac address.  The application already
1948          * set the master's mac address to that of the first slave
1949          */
1950         memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1951         ss.ss_family = slave_dev->type;
1952         res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1953                       extack);
1954         if (res) {
1955             slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1956             goto err_restore_mtu;
1957         }
1958     }
1959
1960     /* set slave flag before open to prevent IPv6 addrconf */
1961     slave_dev->flags |= IFF_SLAVE;
1962
1963     /* open the slave since the application closed it */
1964     res = dev_open(slave_dev, extack);
1965     if (res) {
1966         slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1967         goto err_restore_mac;
1968     }
1969
1970     slave_dev->priv_flags |= IFF_BONDING;
1971     /* initialize slave stats */
1972     dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1973
1974     if (bond_is_lb(bond)) {
1975         /* bond_alb_init_slave() must be called before all other stages since
1976          * it might fail and we do not want to have to undo everything
1977          */
1978         res = bond_alb_init_slave(bond, new_slave);
1979         if (res)
1980             goto err_close;
1981     }
1982
1983     res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1984     if (res) {
1985         slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1986         goto err_close;
1987     }
1988
1989     prev_slave = bond_last_slave(bond);
1990
1991     new_slave->delay = 0;
1992     new_slave->link_failure_count = 0;
1993
1994     if (bond_update_speed_duplex(new_slave) &&
1995         bond_needs_speed_duplex(bond))
1996         new_slave->link = BOND_LINK_DOWN;
1997
1998     new_slave->last_rx = jiffies -
1999         (msecs_to_jiffies(bond->params.arp_interval) + 1);
2000     for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
2001         new_slave->target_last_arp_rx[i] = new_slave->last_rx;
2002
2003     new_slave->last_tx = new_slave->last_rx;
2004
2005     if (bond->params.miimon && !bond->params.use_carrier) {
2006         link_reporting = bond_check_dev_link(bond, slave_dev, 1);
2007
2008         if ((link_reporting == -1) && !bond->params.arp_interval) {
2009             /* miimon is set but a bonded network driver
2010              * does not support ETHTOOL/MII and
2011              * arp_interval is not set.  Note: if
2012              * use_carrier is enabled, we will never go
2013              * here (because netif_carrier is always
2014              * supported); thus, we don't need to change
2015              * the messages for netif_carrier.
2016              */
2017             slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
2018         } else if (link_reporting == -1) {
2019             /* unable get link status using mii/ethtool */
2020             slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
2021         }
2022     }
2023
2024     /* check for initial state */
2025     new_slave->link = BOND_LINK_NOCHANGE;
2026     if (bond->params.miimon) {
2027         if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
2028             if (bond->params.updelay) {
2029                 bond_set_slave_link_state(new_slave,
2030                               BOND_LINK_BACK,
2031                               BOND_SLAVE_NOTIFY_NOW);
2032                 new_slave->delay = bond->params.updelay;
2033             } else {
2034                 bond_set_slave_link_state(new_slave,
2035                               BOND_LINK_UP,
2036                               BOND_SLAVE_NOTIFY_NOW);
2037             }
2038         } else {
2039             bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
2040                           BOND_SLAVE_NOTIFY_NOW);
2041         }
2042     } else if (bond->params.arp_interval) {
2043         bond_set_slave_link_state(new_slave,
2044                       (netif_carrier_ok(slave_dev) ?
2045                       BOND_LINK_UP : BOND_LINK_DOWN),
2046                       BOND_SLAVE_NOTIFY_NOW);
2047     } else {
2048         bond_set_slave_link_state(new_slave, BOND_LINK_UP,
2049                       BOND_SLAVE_NOTIFY_NOW);
2050     }
2051
2052     if (new_slave->link != BOND_LINK_DOWN)
2053         new_slave->last_link_up = jiffies;
2054     slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
2055           new_slave->link == BOND_LINK_DOWN ? "DOWN" :
2056           (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
2057
2058     if (bond_uses_primary(bond) && bond->params.primary[0]) {
2059         /* if there is a primary slave, remember it */
2060         if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
2061             rcu_assign_pointer(bond->primary_slave, new_slave);
2062             bond->force_primary = true;
2063         }
2064     }
2065
2066     switch (BOND_MODE(bond)) {
2067     case BOND_MODE_ACTIVEBACKUP:
2068         bond_set_slave_inactive_flags(new_slave,
2069                           BOND_SLAVE_NOTIFY_NOW);
2070         break;
2071     case BOND_MODE_8023AD:
2072         /* in 802.3ad mode, the internal mechanism
2073          * will activate the slaves in the selected
2074          * aggregator
2075          */
2076         bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2077         /* if this is the first slave */
2078         if (!prev_slave) {
2079             SLAVE_AD_INFO(new_slave)->id = 1;
2080             /* Initialize AD with the number of times that the AD timer is called in 1 second
2081              * can be called only after the mac address of the bond is set
2082              */
2083             bond_3ad_initialize(bond);
2084         } else {
2085             SLAVE_AD_INFO(new_slave)->id =
2086                 SLAVE_AD_INFO(prev_slave)->id + 1;
2087         }
2088
2089         bond_3ad_bind_slave(new_slave);
2090         break;
2091     case BOND_MODE_TLB:
2092     case BOND_MODE_ALB:
2093         bond_set_active_slave(new_slave);
2094         bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2095         break;
2096     default:
2097         slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
2098
2099         /* always active in trunk mode */
2100         bond_set_active_slave(new_slave);
2101
2102         /* In trunking mode there is little meaning to curr_active_slave
2103          * anyway (it holds no special properties of the bond device),
2104          * so we can change it without calling change_active_interface()
2105          */
2106         if (!rcu_access_pointer(bond->curr_active_slave) &&
2107             new_slave->link == BOND_LINK_UP)
2108             rcu_assign_pointer(bond->curr_active_slave, new_slave);
2109
2110         break;
2111     } /* switch(bond_mode) */
2112
2113 #ifdef CONFIG_NET_POLL_CONTROLLER
2114     if (bond->dev->npinfo) {
2115         if (slave_enable_netpoll(new_slave)) {
2116             slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
2117             res = -EBUSY;
2118             goto err_detach;
2119         }
2120     }
2121 #endif
2122
2123     if (!(bond_dev->features & NETIF_F_LRO))
2124         dev_disable_lro(slave_dev);
2125
2126     res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
2127                      new_slave);
2128     if (res) {
2129         slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
2130         goto err_detach;
2131     }
2132
2133     res = bond_master_upper_dev_link(bond, new_slave, extack);
2134     if (res) {
2135         slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
2136         goto err_unregister;
2137     }
2138
2139     bond_lower_state_changed(new_slave);
2140
2141     res = bond_sysfs_slave_add(new_slave);
2142     if (res) {
2143         slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
2144         goto err_upper_unlink;
2145     }
2146
2147     /* If the mode uses primary, then the following is handled by
2148      * bond_change_active_slave().
2149      */
2150     if (!bond_uses_primary(bond)) {
2151         /* set promiscuity level to new slave */
2152         if (bond_dev->flags & IFF_PROMISC) {
2153             res = dev_set_promiscuity(slave_dev, 1);
2154             if (res)
2155                 goto err_sysfs_del;
2156         }
2157
2158         /* set allmulti level to new slave */
2159         if (bond_dev->flags & IFF_ALLMULTI) {
2160             res = dev_set_allmulti(slave_dev, 1);
2161             if (res) {
2162                 if (bond_dev->flags & IFF_PROMISC)
2163                     dev_set_promiscuity(slave_dev, -1);
2164                 goto err_sysfs_del;
2165             }
2166         }
2167
2168         if (bond_dev->flags & IFF_UP) {
2169             netif_addr_lock_bh(bond_dev);
2170             dev_mc_sync_multiple(slave_dev, bond_dev);
2171             dev_uc_sync_multiple(slave_dev, bond_dev);
2172             netif_addr_unlock_bh(bond_dev);
2173
2174             if (BOND_MODE(bond) == BOND_MODE_8023AD)
2175                 dev_mc_add(slave_dev, lacpdu_mcast_addr);
2176         }
2177     }
2178
2179     bond->slave_cnt++;
2180     bond_compute_features(bond);
2181     bond_set_carrier(bond);
2182
2183     if (bond_uses_primary(bond)) {
2184         block_netpoll_tx();
2185         bond_select_active_slave(bond);
2186         unblock_netpoll_tx();
2187     }
2188
2189     if (bond_mode_can_use_xmit_hash(bond))
2190         bond_update_slave_arr(bond, NULL);
2191
2192
2193     if (!slave_dev->netdev_ops->ndo_bpf ||
2194         !slave_dev->netdev_ops->ndo_xdp_xmit) {
2195         if (bond->xdp_prog) {
2196             SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2197                      "Slave does not support XDP");
2198             res = -EOPNOTSUPP;
2199             goto err_sysfs_del;
2200         }
2201     } else if (bond->xdp_prog) {
2202         struct netdev_bpf xdp = {
2203             .command = XDP_SETUP_PROG,
2204             .flags   = 0,
2205             .prog    = bond->xdp_prog,
2206             .extack  = extack,
2207         };
2208
2209         if (dev_xdp_prog_count(slave_dev) > 0) {
2210             SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2211                      "Slave has XDP program loaded, please unload before enslaving");
2212             res = -EOPNOTSUPP;
2213             goto err_sysfs_del;
2214         }
2215
2216         res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
2217         if (res < 0) {
2218             /* ndo_bpf() sets extack error message */
2219             slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res);
2220             goto err_sysfs_del;
2221         }
2222         if (bond->xdp_prog)
2223             bpf_prog_inc(bond->xdp_prog);
2224     }
2225
2226     slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2227            bond_is_active_slave(new_slave) ? "an active" : "a backup",
2228            new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2229
2230     /* enslave is successful */
2231     bond_queue_slave_event(new_slave);
2232     return 0;
2233
2234 /* Undo stages on error */
2235 err_sysfs_del:
2236     bond_sysfs_slave_del(new_slave);
2237
2238 err_upper_unlink:
2239     bond_upper_dev_unlink(bond, new_slave);
2240
2241 err_unregister:
2242     netdev_rx_handler_unregister(slave_dev);
2243
2244 err_detach:
2245     vlan_vids_del_by_dev(slave_dev, bond_dev);
2246     if (rcu_access_pointer(bond->primary_slave) == new_slave)
2247         RCU_INIT_POINTER(bond->primary_slave, NULL);
2248     if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2249         block_netpoll_tx();
2250         bond_change_active_slave(bond, NULL);
2251         bond_select_active_slave(bond);
2252         unblock_netpoll_tx();
2253     }
2254     /* either primary_slave or curr_active_slave might've changed */
2255     synchronize_rcu();
2256     slave_disable_netpoll(new_slave);
2257
2258 err_close:
2259     if (!netif_is_bond_master(slave_dev))
2260         slave_dev->priv_flags &= ~IFF_BONDING;
2261     dev_close(slave_dev);
2262
2263 err_restore_mac:
2264     slave_dev->flags &= ~IFF_SLAVE;
2265     if (!bond->params.fail_over_mac ||
2266         BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2267         /* XXX TODO - fom follow mode needs to change master's
2268          * MAC if this slave's MAC is in use by the bond, or at
2269          * least print a warning.
2270          */
2271         bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2272                   new_slave->dev->addr_len);
2273         ss.ss_family = slave_dev->type;
2274         dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2275     }
2276
2277 err_restore_mtu:
2278     dev_set_mtu(slave_dev, new_slave->original_mtu);
2279
2280 err_free:
2281     kobject_put(&new_slave->kobj);
2282
2283 err_undo_flags:
2284     /* Enslave of first slave has failed and we need to fix master's mac */
2285     if (!bond_has_slaves(bond)) {
2286         if (ether_addr_equal_64bits(bond_dev->dev_addr,
2287                         slave_dev->dev_addr))
2288             eth_hw_addr_random(bond_dev);
2289         if (bond_dev->type != ARPHRD_ETHER) {
2290             dev_close(bond_dev);
2291             ether_setup(bond_dev);
2292             bond_dev->flags |= IFF_MASTER;
2293             bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2294         }
2295     }
2296
2297     return res;
2298 }
2299
2300 /* Try to release the slave device <slave> from the bond device <master>
2301  * It is legal to access curr_active_slave without a lock because all the function
2302  * is RTNL-locked. If "all" is true it means that the function is being called
2303  * while destroying a bond interface and all slaves are being released.
2304  *
2305  * The rules for slave state should be:
2306  *   for Active/Backup:
2307  *     Active stays on all backups go down
2308  *   for Bonded connections:
2309  *     The first up interface should be left on and all others downed.
2310  */
2311 static int __bond_release_one(struct net_device *bond_dev,
2312                   struct net_device *slave_dev,
2313                   bool all, bool unregister)
2314 {
2315     struct bonding *bond = netdev_priv(bond_dev);
2316     struct slave *slave, *oldcurrent;
2317     struct sockaddr_storage ss;
2318     int old_flags = bond_dev->flags;
2319     netdev_features_t old_features = bond_dev->features;
2320
2321     /* slave is not a slave or master is not master of this slave */
2322     if (!(slave_dev->flags & IFF_SLAVE) ||
2323         !netdev_has_upper_dev(slave_dev, bond_dev)) {
2324         slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2325         return -EINVAL;
2326     }
2327
2328     block_netpoll_tx();
2329
2330     slave = bond_get_slave_by_dev(bond, slave_dev);
2331     if (!slave) {
2332         /* not a slave of this bond */
2333         slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2334         unblock_netpoll_tx();
2335         return -EINVAL;
2336     }
2337
2338     bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2339
2340     bond_sysfs_slave_del(slave);
2341
2342     /* recompute stats just before removing the slave */
2343     bond_get_stats(bond->dev, &bond->bond_stats);
2344
2345     if (bond->xdp_prog) {
2346         struct netdev_bpf xdp = {
2347             .command = XDP_SETUP_PROG,
2348             .flags   = 0,
2349             .prog    = NULL,
2350             .extack  = NULL,
2351         };
2352         if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp))
2353             slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n");
2354     }
2355
2356     /* unregister rx_handler early so bond_handle_frame wouldn't be called
2357      * for this slave anymore.
2358      */
2359     netdev_rx_handler_unregister(slave_dev);
2360
2361     if (BOND_MODE(bond) == BOND_MODE_8023AD)
2362         bond_3ad_unbind_slave(slave);
2363
2364     bond_upper_dev_unlink(bond, slave);
2365
2366     if (bond_mode_can_use_xmit_hash(bond))
2367         bond_update_slave_arr(bond, slave);
2368
2369     slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2370             bond_is_active_slave(slave) ? "active" : "backup");
2371
2372     oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2373
2374     RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2375
2376     if (!all && (!bond->params.fail_over_mac ||
2377              BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2378         if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2379             bond_has_slaves(bond))
2380             slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2381                    slave->perm_hwaddr);
2382     }
2383
2384     if (rtnl_dereference(bond->primary_slave) == slave)
2385         RCU_INIT_POINTER(bond->primary_slave, NULL);
2386
2387     if (oldcurrent == slave)
2388         bond_change_active_slave(bond, NULL);
2389
2390     if (bond_is_lb(bond)) {
2391         /* Must be called only after the slave has been
2392          * detached from the list and the curr_active_slave
2393          * has been cleared (if our_slave == old_current),
2394          * but before a new active slave is selected.
2395          */
2396         bond_alb_deinit_slave(bond, slave);
2397     }
2398
2399     if (all) {
2400         RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2401     } else if (oldcurrent == slave) {
2402         /* Note that we hold RTNL over this sequence, so there
2403          * is no concern that another slave add/remove event
2404          * will interfere.
2405          */
2406         bond_select_active_slave(bond);
2407     }
2408
2409     bond_set_carrier(bond);
2410     if (!bond_has_slaves(bond))
2411         eth_hw_addr_random(bond_dev);
2412
2413     unblock_netpoll_tx();
2414     synchronize_rcu();
2415     bond->slave_cnt--;
2416
2417     if (!bond_has_slaves(bond)) {
2418         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2419         call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2420     }
2421
2422     bond_compute_features(bond);
2423     if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2424         (old_features & NETIF_F_VLAN_CHALLENGED))
2425         slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2426
2427     vlan_vids_del_by_dev(slave_dev, bond_dev);
2428
2429     /* If the mode uses primary, then this case was handled above by
2430      * bond_change_active_slave(..., NULL)
2431      */
2432     if (!bond_uses_primary(bond)) {
2433         /* unset promiscuity level from slave
2434          * NOTE: The NETDEV_CHANGEADDR call above may change the value
2435          * of the IFF_PROMISC flag in the bond_dev, but we need the
2436          * value of that flag before that change, as that was the value
2437          * when this slave was attached, so we cache at the start of the
2438          * function and use it here. Same goes for ALLMULTI below
2439          */
2440         if (old_flags & IFF_PROMISC)
2441             dev_set_promiscuity(slave_dev, -1);
2442
2443         /* unset allmulti level from slave */
2444         if (old_flags & IFF_ALLMULTI)
2445             dev_set_allmulti(slave_dev, -1);
2446
2447         if (old_flags & IFF_UP)
2448             bond_hw_addr_flush(bond_dev, slave_dev);
2449     }
2450
2451     slave_disable_netpoll(slave);
2452
2453     /* close slave before restoring its mac address */
2454     dev_close(slave_dev);
2455
2456     if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2457         BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2458         /* restore original ("permanent") mac address */
2459         bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2460                   slave->dev->addr_len);
2461         ss.ss_family = slave_dev->type;
2462         dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2463     }
2464
2465     if (unregister)
2466         __dev_set_mtu(slave_dev, slave->original_mtu);
2467     else
2468         dev_set_mtu(slave_dev, slave->original_mtu);
2469
2470     if (!netif_is_bond_master(slave_dev))
2471         slave_dev->priv_flags &= ~IFF_BONDING;
2472
2473     kobject_put(&slave->kobj);
2474
2475     return 0;
2476 }
2477
2478 /* A wrapper used because of ndo_del_link */
2479 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2480 {
2481     return __bond_release_one(bond_dev, slave_dev, false, false);
2482 }
2483
2484 /* First release a slave and then destroy the bond if no more slaves are left.
2485  * Must be under rtnl_lock when this function is called.
2486  */
2487 static int bond_release_and_destroy(struct net_device *bond_dev,
2488                     struct net_device *slave_dev)
2489 {
2490     struct bonding *bond = netdev_priv(bond_dev);
2491     int ret;
2492
2493     ret = __bond_release_one(bond_dev, slave_dev, false, true);
2494     if (ret == 0 && !bond_has_slaves(bond) &&
2495         bond_dev->reg_state != NETREG_UNREGISTERING) {
2496         bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2497         netdev_info(bond_dev, "Destroying bond\n");
2498         bond_remove_proc_entry(bond);
2499         unregister_netdevice(bond_dev);
2500     }
2501     return ret;
2502 }
2503
2504 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2505 {
2506     struct bonding *bond = netdev_priv(bond_dev);
2507
2508     bond_fill_ifbond(bond, info);
2509 }
2510
2511 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2512 {
2513     struct bonding *bond = netdev_priv(bond_dev);
2514     struct list_head *iter;
2515     int i = 0, res = -ENODEV;
2516     struct slave *slave;
2517
2518     bond_for_each_slave(bond, slave, iter) {
2519         if (i++ == (int)info->slave_id) {
2520             res = 0;
2521             bond_fill_ifslave(slave, info);
2522             break;
2523         }
2524     }
2525
2526     return res;
2527 }
2528
2529 /*-------------------------------- Monitoring -------------------------------*/
2530
2531 /* called with rcu_read_lock() */
2532 static int bond_miimon_inspect(struct bonding *bond)
2533 {
2534     int link_state, commit = 0;
2535     struct list_head *iter;
2536     struct slave *slave;
2537     bool ignore_updelay;
2538
2539     ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2540
2541     bond_for_each_slave_rcu(bond, slave, iter) {
2542         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2543
2544         link_state = bond_check_dev_link(bond, slave->dev, 0);
2545
2546         switch (slave->link) {
2547         case BOND_LINK_UP:
2548             if (link_state)
2549                 continue;
2550
2551             bond_propose_link_state(slave, BOND_LINK_FAIL);
2552             commit++;
2553             slave->delay = bond->params.downdelay;
2554             if (slave->delay) {
2555                 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2556                        (BOND_MODE(bond) ==
2557                         BOND_MODE_ACTIVEBACKUP) ?
2558                         (bond_is_active_slave(slave) ?
2559                          "active " : "backup ") : "",
2560                        bond->params.downdelay * bond->params.miimon);
2561             }
2562             fallthrough;
2563         case BOND_LINK_FAIL:
2564             if (link_state) {
2565                 /* recovered before downdelay expired */
2566                 bond_propose_link_state(slave, BOND_LINK_UP);
2567                 slave->last_link_up = jiffies;
2568                 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2569                        (bond->params.downdelay - slave->delay) *
2570                        bond->params.miimon);
2571                 commit++;
2572                 continue;
2573             }
2574
2575             if (slave->delay <= 0) {
2576                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2577                 commit++;
2578                 continue;
2579             }
2580
2581             slave->delay--;
2582             break;
2583
2584         case BOND_LINK_DOWN:
2585             if (!link_state)
2586                 continue;
2587
2588             bond_propose_link_state(slave, BOND_LINK_BACK);
2589             commit++;
2590             slave->delay = bond->params.updelay;
2591
2592             if (slave->delay) {
2593                 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2594                        ignore_updelay ? 0 :
2595                        bond->params.updelay *
2596                        bond->params.miimon);
2597             }
2598             fallthrough;
2599         case BOND_LINK_BACK:
2600             if (!link_state) {
2601                 bond_propose_link_state(slave, BOND_LINK_DOWN);
2602                 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2603                        (bond->params.updelay - slave->delay) *
2604                        bond->params.miimon);
2605                 commit++;
2606                 continue;
2607             }
2608
2609             if (ignore_updelay)
2610                 slave->delay = 0;
2611
2612             if (slave->delay <= 0) {
2613                 bond_propose_link_state(slave, BOND_LINK_UP);
2614                 commit++;
2615                 ignore_updelay = false;
2616                 continue;
2617             }
2618
2619             slave->delay--;
2620             break;
2621         }
2622     }
2623
2624     return commit;
2625 }
2626
2627 static void bond_miimon_link_change(struct bonding *bond,
2628                     struct slave *slave,
2629                     char link)
2630 {
2631     switch (BOND_MODE(bond)) {
2632     case BOND_MODE_8023AD:
2633         bond_3ad_handle_link_change(slave, link);
2634         break;
2635     case BOND_MODE_TLB:
2636     case BOND_MODE_ALB:
2637         bond_alb_handle_link_change(bond, slave, link);
2638         break;
2639     case BOND_MODE_XOR:
2640         bond_update_slave_arr(bond, NULL);
2641         break;
2642     }
2643 }
2644
2645 static void bond_miimon_commit(struct bonding *bond)
2646 {
2647     struct list_head *iter;
2648     struct slave *slave, *primary;
2649
2650     bond_for_each_slave(bond, slave, iter) {
2651         switch (slave->link_new_state) {
2652         case BOND_LINK_NOCHANGE:
2653             /* For 802.3ad mode, check current slave speed and
2654              * duplex again in case its port was disabled after
2655              * invalid speed/duplex reporting but recovered before
2656              * link monitoring could make a decision on the actual
2657              * link status
2658              */
2659             if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2660                 slave->link == BOND_LINK_UP)
2661                 bond_3ad_adapter_speed_duplex_changed(slave);
2662             continue;
2663
2664         case BOND_LINK_UP:
2665             if (bond_update_speed_duplex(slave) &&
2666                 bond_needs_speed_duplex(bond)) {
2667                 slave->link = BOND_LINK_DOWN;
2668                 if (net_ratelimit())
2669                     slave_warn(bond->dev, slave->dev,
2670                            "failed to get link speed/duplex\n");
2671                 continue;
2672             }
2673             bond_set_slave_link_state(slave, BOND_LINK_UP,
2674                           BOND_SLAVE_NOTIFY_NOW);
2675             slave->last_link_up = jiffies;
2676
2677             primary = rtnl_dereference(bond->primary_slave);
2678             if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2679                 /* prevent it from being the active one */
2680                 bond_set_backup_slave(slave);
2681             } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2682                 /* make it immediately active */
2683                 bond_set_active_slave(slave);
2684             }
2685
2686             slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2687                    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2688                    slave->duplex ? "full" : "half");
2689
2690             bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2691
2692             if (!bond->curr_active_slave || slave == primary)
2693                 goto do_failover;
2694
2695             continue;
2696
2697         case BOND_LINK_DOWN:
2698             if (slave->link_failure_count < UINT_MAX)
2699                 slave->link_failure_count++;
2700
2701             bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2702                           BOND_SLAVE_NOTIFY_NOW);
2703
2704             if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2705                 BOND_MODE(bond) == BOND_MODE_8023AD)
2706                 bond_set_slave_inactive_flags(slave,
2707                                   BOND_SLAVE_NOTIFY_NOW);
2708
2709             slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2710
2711             bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2712
2713             if (slave == rcu_access_pointer(bond->curr_active_slave))
2714                 goto do_failover;
2715
2716             continue;
2717
2718         default:
2719             slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2720                   slave->link_new_state);
2721             bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2722
2723             continue;
2724         }
2725
2726 do_failover:
2727         block_netpoll_tx();
2728         bond_select_active_slave(bond);
2729         unblock_netpoll_tx();
2730     }
2731
2732     bond_set_carrier(bond);
2733 }
2734
2735 /* bond_mii_monitor
2736  *
2737  * Really a wrapper that splits the mii monitor into two phases: an
2738  * inspection, then (if inspection indicates something needs to be done)
2739  * an acquisition of appropriate locks followed by a commit phase to
2740  * implement whatever link state changes are indicated.
2741  */
2742 static void bond_mii_monitor(struct work_struct *work)
2743 {
2744     struct bonding *bond = container_of(work, struct bonding,
2745                         mii_work.work);
2746     bool should_notify_peers = false;
2747     bool commit;
2748     unsigned long delay;
2749     struct slave *slave;
2750     struct list_head *iter;
2751
2752     delay = msecs_to_jiffies(bond->params.miimon);
2753
2754     if (!bond_has_slaves(bond))
2755         goto re_arm;
2756
2757     rcu_read_lock();
2758     should_notify_peers = bond_should_notify_peers(bond);
2759     commit = !!bond_miimon_inspect(bond);
2760     if (bond->send_peer_notif) {
2761         rcu_read_unlock();
2762         if (rtnl_trylock()) {
2763             bond->send_peer_notif--;
2764             rtnl_unlock();
2765         }
2766     } else {
2767         rcu_read_unlock();
2768     }
2769
2770     if (commit) {
2771         /* Race avoidance with bond_close cancel of workqueue */
2772         if (!rtnl_trylock()) {
2773             delay = 1;
2774             should_notify_peers = false;
2775             goto re_arm;
2776         }
2777
2778         bond_for_each_slave(bond, slave, iter) {
2779             bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2780         }
2781         bond_miimon_commit(bond);
2782
2783         rtnl_unlock();  /* might sleep, hold no other locks */
2784     }
2785
2786 re_arm:
2787     if (bond->params.miimon)
2788         queue_delayed_work(bond->wq, &bond->mii_work, delay);
2789
2790     if (should_notify_peers) {
2791         if (!rtnl_trylock())
2792             return;
2793         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2794         rtnl_unlock();
2795     }
2796 }
2797
2798 static int bond_upper_dev_walk(struct net_device *upper,
2799                    struct netdev_nested_priv *priv)
2800 {
2801     __be32 ip = *(__be32 *)priv->data;
2802
2803     return ip == bond_confirm_addr(upper, 0, ip);
2804 }
2805
2806 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2807 {
2808     struct netdev_nested_priv priv = {
2809         .data = (void *)&ip,
2810     };
2811     bool ret = false;
2812
2813     if (ip == bond_confirm_addr(bond->dev, 0, ip))
2814         return true;
2815
2816     rcu_read_lock();
2817     if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2818         ret = true;
2819     rcu_read_unlock();
2820
2821     return ret;
2822 }
2823
2824 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags,
2825                  struct sk_buff *skb)
2826 {
2827     struct net_device *bond_dev = slave->bond->dev;
2828     struct net_device *slave_dev = slave->dev;
2829     struct bond_vlan_tag *outer_tag = tags;
2830
2831     if (!tags || tags->vlan_proto == VLAN_N_VID)
2832         return true;
2833
2834     tags++;
2835
2836     /* Go through all the tags backwards and add them to the packet */
2837     while (tags->vlan_proto != VLAN_N_VID) {
2838         if (!tags->vlan_id) {
2839             tags++;
2840             continue;
2841         }
2842
2843         slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2844               ntohs(outer_tag->vlan_proto), tags->vlan_id);
2845         skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2846                         tags->vlan_id);
2847         if (!skb) {
2848             net_err_ratelimited("failed to insert inner VLAN tag\n");
2849             return false;
2850         }
2851
2852         tags++;
2853     }
2854     /* Set the outer tag */
2855     if (outer_tag->vlan_id) {
2856         slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2857               ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2858         __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2859                        outer_tag->vlan_id);
2860     }
2861
2862     return true;
2863 }
2864
2865 /* We go to the (large) trouble of VLAN tagging ARP frames because
2866  * switches in VLAN mode (especially if ports are configured as
2867  * "native" to a VLAN) might not pass non-tagged frames.
2868  */
2869 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2870               __be32 src_ip, struct bond_vlan_tag *tags)
2871 {
2872     struct net_device *bond_dev = slave->bond->dev;
2873     struct net_device *slave_dev = slave->dev;
2874     struct sk_buff *skb;
2875
2876     slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2877           arp_op, &dest_ip, &src_ip);
2878
2879     skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2880              NULL, slave_dev->dev_addr, NULL);
2881
2882     if (!skb) {
2883         net_err_ratelimited("ARP packet allocation failed\n");
2884         return;
2885     }
2886
2887     if (bond_handle_vlan(slave, tags, skb)) {
2888         slave_update_last_tx(slave);
2889         arp_xmit(skb);
2890     }
2891
2892     return;
2893 }
2894
2895 /* Validate the device path between the @start_dev and the @end_dev.
2896  * The path is valid if the @end_dev is reachable through device
2897  * stacking.
2898  * When the path is validated, collect any vlan information in the
2899  * path.
2900  */
2901 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2902                           struct net_device *end_dev,
2903                           int level)
2904 {
2905     struct bond_vlan_tag *tags;
2906     struct net_device *upper;
2907     struct list_head  *iter;
2908
2909     if (start_dev == end_dev) {
2910         tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2911         if (!tags)
2912             return ERR_PTR(-ENOMEM);
2913         tags[level].vlan_proto = VLAN_N_VID;
2914         return tags;
2915     }
2916
2917     netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2918         tags = bond_verify_device_path(upper, end_dev, level + 1);
2919         if (IS_ERR_OR_NULL(tags)) {
2920             if (IS_ERR(tags))
2921                 return tags;
2922             continue;
2923         }
2924         if (is_vlan_dev(upper)) {
2925             tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2926             tags[level].vlan_id = vlan_dev_vlan_id(upper);
2927         }
2928
2929         return tags;
2930     }
2931
2932     return NULL;
2933 }
2934
2935 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2936 {
2937     struct rtable *rt;
2938     struct bond_vlan_tag *tags;
2939     __be32 *targets = bond->params.arp_targets, addr;
2940     int i;
2941
2942     for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2943         slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2944               __func__, &targets[i]);
2945         tags = NULL;
2946
2947         /* Find out through which dev should the packet go */
2948         rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2949                      RTO_ONLINK, 0);
2950         if (IS_ERR(rt)) {
2951             /* there's no route to target - try to send arp
2952              * probe to generate any traffic (arp_validate=0)
2953              */
2954             if (bond->params.arp_validate)
2955                 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2956                          bond->dev->name,
2957                          &targets[i]);
2958             bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2959                       0, tags);
2960             continue;
2961         }
2962
2963         /* bond device itself */
2964         if (rt->dst.dev == bond->dev)
2965             goto found;
2966
2967         rcu_read_lock();
2968         tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2969         rcu_read_unlock();
2970
2971         if (!IS_ERR_OR_NULL(tags))
2972             goto found;
2973
2974         /* Not our device - skip */
2975         slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2976                &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2977
2978         ip_rt_put(rt);
2979         continue;
2980
2981 found:
2982         addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2983         ip_rt_put(rt);
2984         bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2985         kfree(tags);
2986     }
2987 }
2988
2989 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2990 {
2991     int i;
2992
2993     if (!sip || !bond_has_this_ip(bond, tip)) {
2994         slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2995                __func__, &sip, &tip);
2996         return;
2997     }
2998
2999     i = bond_get_targets_ip(bond->params.arp_targets, sip);
3000     if (i == -1) {
3001         slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
3002                __func__, &sip);
3003         return;
3004     }
3005     slave->last_rx = jiffies;
3006     slave->target_last_arp_rx[i] = jiffies;
3007 }
3008
3009 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
3010             struct slave *slave)
3011 {
3012     struct arphdr *arp = (struct arphdr *)skb->data;
3013     struct slave *curr_active_slave, *curr_arp_slave;
3014     unsigned char *arp_ptr;
3015     __be32 sip, tip;
3016     unsigned int alen;
3017
3018     alen = arp_hdr_len(bond->dev);
3019
3020     if (alen > skb_headlen(skb)) {
3021         arp = kmalloc(alen, GFP_ATOMIC);
3022         if (!arp)
3023             goto out_unlock;
3024         if (skb_copy_bits(skb, 0, arp, alen) < 0)
3025             goto out_unlock;
3026     }
3027
3028     if (arp->ar_hln != bond->dev->addr_len ||
3029         skb->pkt_type == PACKET_OTHERHOST ||
3030         skb->pkt_type == PACKET_LOOPBACK ||
3031         arp->ar_hrd != htons(ARPHRD_ETHER) ||
3032         arp->ar_pro != htons(ETH_P_IP) ||
3033         arp->ar_pln != 4)
3034         goto out_unlock;
3035
3036     arp_ptr = (unsigned char *)(arp + 1);
3037     arp_ptr += bond->dev->addr_len;
3038     memcpy(&sip, arp_ptr, 4);
3039     arp_ptr += 4 + bond->dev->addr_len;
3040     memcpy(&tip, arp_ptr, 4);
3041
3042     slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
3043           __func__, slave->dev->name, bond_slave_state(slave),
3044           bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3045           &sip, &tip);
3046
3047     curr_active_slave = rcu_dereference(bond->curr_active_slave);
3048     curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3049
3050     /* We 'trust' the received ARP enough to validate it if:
3051      *
3052      * (a) the slave receiving the ARP is active (which includes the
3053      * current ARP slave, if any), or
3054      *
3055      * (b) the receiving slave isn't active, but there is a currently
3056      * active slave and it received valid arp reply(s) after it became
3057      * the currently active slave, or
3058      *
3059      * (c) there is an ARP slave that sent an ARP during the prior ARP
3060      * interval, and we receive an ARP reply on any slave.  We accept
3061      * these because switch FDB update delays may deliver the ARP
3062      * reply to a slave other than the sender of the ARP request.
3063      *
3064      * Note: for (b), backup slaves are receiving the broadcast ARP
3065      * request, not a reply.  This request passes from the sending
3066      * slave through the L2 switch(es) to the receiving slave.  Since
3067      * this is checking the request, sip/tip are swapped for
3068      * validation.
3069      *
3070      * This is done to avoid endless looping when we can't reach the
3071      * arp_ip_target and fool ourselves with our own arp requests.
3072      */
3073     if (bond_is_active_slave(slave))
3074         bond_validate_arp(bond, slave, sip, tip);
3075     else if (curr_active_slave &&
3076          time_after(slave_last_rx(bond, curr_active_slave),
3077                 curr_active_slave->last_link_up))
3078         bond_validate_arp(bond, slave, tip, sip);
3079     else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
3080          bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3081         bond_validate_arp(bond, slave, sip, tip);
3082
3083 out_unlock:
3084     if (arp != (struct arphdr *)skb->data)
3085         kfree(arp);
3086     return RX_HANDLER_ANOTHER;
3087 }
3088
3089 #if IS_ENABLED(CONFIG_IPV6)
3090 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr,
3091              const struct in6_addr *saddr, struct bond_vlan_tag *tags)
3092 {
3093     struct net_device *bond_dev = slave->bond->dev;
3094     struct net_device *slave_dev = slave->dev;
3095     struct in6_addr mcaddr;
3096     struct sk_buff *skb;
3097
3098     slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n",
3099           daddr, saddr);
3100
3101     skb = ndisc_ns_create(slave_dev, daddr, saddr, 0);
3102     if (!skb) {
3103         net_err_ratelimited("NS packet allocation failed\n");
3104         return;
3105     }
3106
3107     addrconf_addr_solict_mult(daddr, &mcaddr);
3108     if (bond_handle_vlan(slave, tags, skb)) {
3109         slave_update_last_tx(slave);
3110         ndisc_send_skb(skb, &mcaddr, saddr);
3111     }
3112 }
3113
3114 static void bond_ns_send_all(struct bonding *bond, struct slave *slave)
3115 {
3116     struct in6_addr *targets = bond->params.ns_targets;
3117     struct bond_vlan_tag *tags;
3118     struct dst_entry *dst;
3119     struct in6_addr saddr;
3120     struct flowi6 fl6;
3121     int i;
3122
3123     for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) {
3124         slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n",
3125               __func__, &targets[i]);
3126         tags = NULL;
3127
3128         /* Find out through which dev should the packet go */
3129         memset(&fl6, 0, sizeof(struct flowi6));
3130         fl6.daddr = targets[i];
3131         fl6.flowi6_oif = bond->dev->ifindex;
3132
3133         dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6);
3134         if (dst->error) {
3135             dst_release(dst);
3136             /* there's no route to target - try to send arp
3137              * probe to generate any traffic (arp_validate=0)
3138              */
3139             if (bond->params.arp_validate)
3140                 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n",
3141                          bond->dev->name,
3142                          &targets[i]);
3143             bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3144             continue;
3145         }
3146
3147         /* bond device itself */
3148         if (dst->dev == bond->dev)
3149             goto found;
3150
3151         rcu_read_lock();
3152         tags = bond_verify_device_path(bond->dev, dst->dev, 0);
3153         rcu_read_unlock();
3154
3155         if (!IS_ERR_OR_NULL(tags))
3156             goto found;
3157
3158         /* Not our device - skip */
3159         slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n",
3160               &targets[i], dst->dev ? dst->dev->name : "NULL");
3161
3162         dst_release(dst);
3163         continue;
3164
3165 found:
3166         if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr))
3167             bond_ns_send(slave, &targets[i], &saddr, tags);
3168         else
3169             bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3170
3171         dst_release(dst);
3172         kfree(tags);
3173     }
3174 }
3175
3176 static int bond_confirm_addr6(struct net_device *dev,
3177                   struct netdev_nested_priv *priv)
3178 {
3179     struct in6_addr *addr = (struct in6_addr *)priv->data;
3180
3181     return ipv6_chk_addr(dev_net(dev), addr, dev, 0);
3182 }
3183
3184 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr)
3185 {
3186     struct netdev_nested_priv priv = {
3187         .data = addr,
3188     };
3189     int ret = false;
3190
3191     if (bond_confirm_addr6(bond->dev, &priv))
3192         return true;
3193
3194     rcu_read_lock();
3195     if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv))
3196         ret = true;
3197     rcu_read_unlock();
3198
3199     return ret;
3200 }
3201
3202 static void bond_validate_na(struct bonding *bond, struct slave *slave,
3203                  struct in6_addr *saddr, struct in6_addr *daddr)
3204 {
3205     int i;
3206
3207     /* Ignore NAs that:
3208      * 1. Source address is unspecified address.
3209      * 2. Dest address is neither all-nodes multicast address nor
3210      *    exist on bond interface.
3211      */
3212     if (ipv6_addr_any(saddr) ||
3213         (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) &&
3214          !bond_has_this_ip6(bond, daddr))) {
3215         slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n",
3216               __func__, saddr, daddr);
3217         return;
3218     }
3219
3220     i = bond_get_targets_ip6(bond->params.ns_targets, saddr);
3221     if (i == -1) {
3222         slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n",
3223               __func__, saddr);
3224         return;
3225     }
3226     slave->last_rx = jiffies;
3227     slave->target_last_arp_rx[i] = jiffies;
3228 }
3229
3230 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,
3231                struct slave *slave)
3232 {
3233     struct slave *curr_active_slave, *curr_arp_slave;
3234     struct icmp6hdr *hdr = icmp6_hdr(skb);
3235     struct in6_addr *saddr, *daddr;
3236
3237     if (skb->pkt_type == PACKET_OTHERHOST ||
3238         skb->pkt_type == PACKET_LOOPBACK ||
3239         hdr->icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)
3240         goto out;
3241
3242     saddr = &ipv6_hdr(skb)->saddr;
3243     daddr = &ipv6_hdr(skb)->daddr;
3244
3245     slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n",
3246           __func__, slave->dev->name, bond_slave_state(slave),
3247           bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3248           saddr, daddr);
3249
3250     curr_active_slave = rcu_dereference(bond->curr_active_slave);
3251     curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3252
3253     /* We 'trust' the received ARP enough to validate it if:
3254      * see bond_arp_rcv().
3255      */
3256     if (bond_is_active_slave(slave))
3257         bond_validate_na(bond, slave, saddr, daddr);
3258     else if (curr_active_slave &&
3259          time_after(slave_last_rx(bond, curr_active_slave),
3260                 curr_active_slave->last_link_up))
3261         bond_validate_na(bond, slave, saddr, daddr);
3262     else if (curr_arp_slave &&
3263          bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3264         bond_validate_na(bond, slave, saddr, daddr);
3265
3266 out:
3267     return RX_HANDLER_ANOTHER;
3268 }
3269 #endif
3270
3271 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond,
3272               struct slave *slave)
3273 {
3274 #if IS_ENABLED(CONFIG_IPV6)
3275     bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6);
3276 #endif
3277     bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
3278
3279     slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
3280           __func__, skb->dev->name);
3281
3282     /* Use arp validate logic for both ARP and NS */
3283     if (!slave_do_arp_validate(bond, slave)) {
3284         if ((slave_do_arp_validate_only(bond) && is_arp) ||
3285 #if IS_ENABLED(CONFIG_IPV6)
3286             (slave_do_arp_validate_only(bond) && is_ipv6) ||
3287 #endif
3288             !slave_do_arp_validate_only(bond))
3289             slave->last_rx = jiffies;
3290         return RX_HANDLER_ANOTHER;
3291     } else if (is_arp) {
3292         return bond_arp_rcv(skb, bond, slave);
3293 #if IS_ENABLED(CONFIG_IPV6)
3294     } else if (is_ipv6) {
3295         return bond_na_rcv(skb, bond, slave);
3296 #endif
3297     } else {
3298         return RX_HANDLER_ANOTHER;
3299     }
3300 }
3301
3302 static void bond_send_validate(struct bonding *bond, struct slave *slave)
3303 {
3304     bond_arp_send_all(bond, slave);
3305 #if IS_ENABLED(CONFIG_IPV6)
3306     bond_ns_send_all(bond, slave);
3307 #endif
3308 }
3309
3310 /* function to verify if we're in the arp_interval timeslice, returns true if
3311  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
3312  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
3313  */
3314 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
3315                   int mod)
3316 {
3317     int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3318
3319     return time_in_range(jiffies,
3320                  last_act - delta_in_ticks,
3321                  last_act + mod * delta_in_ticks + delta_in_ticks/2);
3322 }
3323
3324 /* This function is called regularly to monitor each slave's link
3325  * ensuring that traffic is being sent and received when arp monitoring
3326  * is used in load-balancing mode. if the adapter has been dormant, then an
3327  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
3328  * arp monitoring in active backup mode.
3329  */
3330 static void bond_loadbalance_arp_mon(struct bonding *bond)
3331 {
3332     struct slave *slave, *oldcurrent;
3333     struct list_head *iter;
3334     int do_failover = 0, slave_state_changed = 0;
3335
3336     if (!bond_has_slaves(bond))
3337         goto re_arm;
3338
3339     rcu_read_lock();
3340
3341     oldcurrent = rcu_dereference(bond->curr_active_slave);
3342     /* see if any of the previous devices are up now (i.e. they have
3343      * xmt and rcv traffic). the curr_active_slave does not come into
3344      * the picture unless it is null. also, slave->last_link_up is not
3345      * needed here because we send an arp on each slave and give a slave
3346      * as long as it needs to get the tx/rx within the delta.
3347      * TODO: what about up/down delay in arp mode? it wasn't here before
3348      *       so it can wait
3349      */
3350     bond_for_each_slave_rcu(bond, slave, iter) {
3351         unsigned long last_tx = slave_last_tx(slave);
3352
3353         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3354
3355         if (slave->link != BOND_LINK_UP) {
3356             if (bond_time_in_interval(bond, last_tx, 1) &&
3357                 bond_time_in_interval(bond, slave->last_rx, 1)) {
3358
3359                 bond_propose_link_state(slave, BOND_LINK_UP);
3360                 slave_state_changed = 1;
3361
3362                 /* primary_slave has no meaning in round-robin
3363                  * mode. the window of a slave being up and
3364                  * curr_active_slave being null after enslaving
3365                  * is closed.
3366                  */
3367                 if (!oldcurrent) {
3368                     slave_info(bond->dev, slave->dev, "link status definitely up\n");
3369                     do_failover = 1;
3370                 } else {
3371                     slave_info(bond->dev, slave->dev, "interface is now up\n");
3372                 }
3373             }
3374         } else {
3375             /* slave->link == BOND_LINK_UP */
3376
3377             /* not all switches will respond to an arp request
3378              * when the source ip is 0, so don't take the link down
3379              * if we don't know our ip yet
3380              */
3381             if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3382                 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) {
3383
3384                 bond_propose_link_state(slave, BOND_LINK_DOWN);
3385                 slave_state_changed = 1;
3386
3387                 if (slave->link_failure_count < UINT_MAX)
3388                     slave->link_failure_count++;
3389
3390                 slave_info(bond->dev, slave->dev, "interface is now down\n");
3391
3392                 if (slave == oldcurrent)
3393                     do_failover = 1;
3394             }
3395         }
3396
3397         /* note: if switch is in round-robin mode, all links
3398          * must tx arp to ensure all links rx an arp - otherwise
3399          * links may oscillate or not come up at all; if switch is
3400          * in something like xor mode, there is nothing we can
3401          * do - all replies will be rx'ed on same link causing slaves
3402          * to be unstable during low/no traffic periods
3403          */
3404         if (bond_slave_is_up(slave))
3405             bond_send_validate(bond, slave);
3406     }
3407
3408     rcu_read_unlock();
3409
3410     if (do_failover || slave_state_changed) {
3411         if (!rtnl_trylock())
3412             goto re_arm;
3413
3414         bond_for_each_slave(bond, slave, iter) {
3415             if (slave->link_new_state != BOND_LINK_NOCHANGE)
3416                 slave->link = slave->link_new_state;
3417         }
3418
3419         if (slave_state_changed) {
3420             bond_slave_state_change(bond);
3421             if (BOND_MODE(bond) == BOND_MODE_XOR)
3422                 bond_update_slave_arr(bond, NULL);
3423         }
3424         if (do_failover) {
3425             block_netpoll_tx();
3426             bond_select_active_slave(bond);
3427             unblock_netpoll_tx();
3428         }
3429         rtnl_unlock();
3430     }
3431
3432 re_arm:
3433     if (bond->params.arp_interval)
3434         queue_delayed_work(bond->wq, &bond->arp_work,
3435                    msecs_to_jiffies(bond->params.arp_interval));
3436 }
3437
3438 /* Called to inspect slaves for active-backup mode ARP monitor link state
3439  * changes.  Sets proposed link state in slaves to specify what action
3440  * should take place for the slave.  Returns 0 if no changes are found, >0
3441  * if changes to link states must be committed.
3442  *
3443  * Called with rcu_read_lock held.
3444  */
3445 static int bond_ab_arp_inspect(struct bonding *bond)
3446 {
3447     unsigned long last_tx, last_rx;
3448     struct list_head *iter;
3449     struct slave *slave;
3450     int commit = 0;
3451
3452     bond_for_each_slave_rcu(bond, slave, iter) {
3453         bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3454         last_rx = slave_last_rx(bond, slave);
3455
3456         if (slave->link != BOND_LINK_UP) {
3457             if (bond_time_in_interval(bond, last_rx, 1)) {
3458                 bond_propose_link_state(slave, BOND_LINK_UP);
3459                 commit++;
3460             } else if (slave->link == BOND_LINK_BACK) {
3461                 bond_propose_link_state(slave, BOND_LINK_FAIL);
3462                 commit++;
3463             }
3464             continue;
3465         }
3466
3467         /* Give slaves 2*delta after being enslaved or made
3468          * active.  This avoids bouncing, as the last receive
3469          * times need a full ARP monitor cycle to be updated.
3470          */
3471         if (bond_time_in_interval(bond, slave->last_link_up, 2))
3472             continue;
3473
3474         /* Backup slave is down if:
3475          * - No current_arp_slave AND
3476          * - more than (missed_max+1)*delta since last receive AND
3477          * - the bond has an IP address
3478          *
3479          * Note: a non-null current_arp_slave indicates
3480          * the curr_active_slave went down and we are
3481          * searching for a new one; under this condition
3482          * we only take the curr_active_slave down - this
3483          * gives each slave a chance to tx/rx traffic
3484          * before being taken out
3485          */
3486         if (!bond_is_active_slave(slave) &&
3487             !rcu_access_pointer(bond->current_arp_slave) &&
3488             !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) {
3489             bond_propose_link_state(slave, BOND_LINK_DOWN);
3490             commit++;
3491         }
3492
3493         /* Active slave is down if:
3494          * - more than missed_max*delta since transmitting OR
3495          * - (more than missed_max*delta since receive AND
3496          *    the bond has an IP address)
3497          */
3498         last_tx = slave_last_tx(slave);
3499         if (bond_is_active_slave(slave) &&
3500             (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3501              !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) {
3502             bond_propose_link_state(slave, BOND_LINK_DOWN);
3503             commit++;
3504         }
3505     }
3506
3507     return commit;
3508 }
3509
3510 /* Called to commit link state changes noted by inspection step of
3511  * active-backup mode ARP monitor.
3512  *
3513  * Called with RTNL hold.
3514  */
3515 static void bond_ab_arp_commit(struct bonding *bond)
3516 {
3517     struct list_head *iter;
3518     unsigned long last_tx;
3519     struct slave *slave;
3520
3521     bond_for_each_slave(bond, slave, iter) {
3522         switch (slave->link_new_state) {
3523         case BOND_LINK_NOCHANGE:
3524             continue;
3525
3526         case BOND_LINK_UP:
3527             last_tx = slave_last_tx(slave);
3528             if (rtnl_dereference(bond->curr_active_slave) != slave ||
3529                 (!rtnl_dereference(bond->curr_active_slave) &&
3530                  bond_time_in_interval(bond, last_tx, 1))) {
3531                 struct slave *current_arp_slave;
3532
3533                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3534                 bond_set_slave_link_state(slave, BOND_LINK_UP,
3535                               BOND_SLAVE_NOTIFY_NOW);
3536                 if (current_arp_slave) {
3537                     bond_set_slave_inactive_flags(
3538                         current_arp_slave,
3539                         BOND_SLAVE_NOTIFY_NOW);
3540                     RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3541                 }
3542
3543                 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3544
3545                 if (!rtnl_dereference(bond->curr_active_slave) ||
3546                     slave == rtnl_dereference(bond->primary_slave))
3547                     goto do_failover;
3548
3549             }
3550
3551             continue;
3552
3553         case BOND_LINK_DOWN:
3554             if (slave->link_failure_count < UINT_MAX)
3555                 slave->link_failure_count++;
3556
3557             bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3558                           BOND_SLAVE_NOTIFY_NOW);
3559             bond_set_slave_inactive_flags(slave,
3560                               BOND_SLAVE_NOTIFY_NOW);
3561
3562             slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3563
3564             if (slave == rtnl_dereference(bond->curr_active_slave)) {
3565                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3566                 goto do_failover;
3567             }
3568
3569             continue;
3570
3571         case BOND_LINK_FAIL:
3572             bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3573                           BOND_SLAVE_NOTIFY_NOW);
3574             bond_set_slave_inactive_flags(slave,
3575                               BOND_SLAVE_NOTIFY_NOW);
3576
3577             /* A slave has just been enslaved and has become
3578              * the current active slave.
3579              */
3580             if (rtnl_dereference(bond->curr_active_slave))
3581                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3582             continue;
3583
3584         default:
3585             slave_err(bond->dev, slave->dev,
3586                   "impossible: link_new_state %d on slave\n",
3587                   slave->link_new_state);
3588             continue;
3589         }
3590
3591 do_failover:
3592         block_netpoll_tx();
3593         bond_select_active_slave(bond);
3594         unblock_netpoll_tx();
3595     }
3596
3597     bond_set_carrier(bond);
3598 }
3599
3600 /* Send ARP probes for active-backup mode ARP monitor.
3601  *
3602  * Called with rcu_read_lock held.
3603  */
3604 static bool bond_ab_arp_probe(struct bonding *bond)
3605 {
3606     struct slave *slave, *before = NULL, *new_slave = NULL,
3607              *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3608              *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3609     struct list_head *iter;
3610     bool found = false;
3611     bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3612
3613     if (curr_arp_slave && curr_active_slave)
3614         netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3615                 curr_arp_slave->dev->name,
3616                 curr_active_slave->dev->name);
3617
3618     if (curr_active_slave) {
3619         bond_send_validate(bond, curr_active_slave);
3620         return should_notify_rtnl;
3621     }
3622
3623     /* if we don't have a curr_active_slave, search for the next available
3624      * backup slave from the current_arp_slave and make it the candidate
3625      * for becoming the curr_active_slave
3626      */
3627
3628     if (!curr_arp_slave) {
3629         curr_arp_slave = bond_first_slave_rcu(bond);
3630         if (!curr_arp_slave)
3631             return should_notify_rtnl;
3632     }
3633
3634     bond_for_each_slave_rcu(bond, slave, iter) {
3635         if (!found && !before && bond_slave_is_up(slave))
3636             before = slave;
3637
3638         if (found && !new_slave && bond_slave_is_up(slave))
3639             new_slave = slave;
3640         /* if the link state is up at this point, we
3641          * mark it down - this can happen if we have
3642          * simultaneous link failures and
3643          * reselect_active_interface doesn't make this
3644          * one the current slave so it is still marked
3645          * up when it is actually down
3646          */
3647         if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3648             bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3649                           BOND_SLAVE_NOTIFY_LATER);
3650             if (slave->link_failure_count < UINT_MAX)
3651                 slave->link_failure_count++;
3652
3653             bond_set_slave_inactive_flags(slave,
3654                               BOND_SLAVE_NOTIFY_LATER);
3655
3656             slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3657         }
3658         if (slave == curr_arp_slave)
3659             found = true;
3660     }
3661
3662     if (!new_slave && before)
3663         new_slave = before;
3664
3665     if (!new_slave)
3666         goto check_state;
3667
3668     bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3669                   BOND_SLAVE_NOTIFY_LATER);
3670     bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3671     bond_send_validate(bond, new_slave);
3672     new_slave->last_link_up = jiffies;
3673     rcu_assign_pointer(bond->current_arp_slave, new_slave);
3674
3675 check_state:
3676     bond_for_each_slave_rcu(bond, slave, iter) {
3677         if (slave->should_notify || slave->should_notify_link) {
3678             should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3679             break;
3680         }
3681     }
3682     return should_notify_rtnl;
3683 }
3684
3685 static void bond_activebackup_arp_mon(struct bonding *bond)
3686 {
3687     bool should_notify_peers = false;
3688     bool should_notify_rtnl = false;
3689     int delta_in_ticks;
3690
3691     delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3692
3693     if (!bond_has_slaves(bond))
3694         goto re_arm;
3695
3696     rcu_read_lock();
3697
3698     should_notify_peers = bond_should_notify_peers(bond);
3699
3700     if (bond_ab_arp_inspect(bond)) {
3701         rcu_read_unlock();
3702
3703         /* Race avoidance with bond_close flush of workqueue */
3704         if (!rtnl_trylock()) {
3705             delta_in_ticks = 1;
3706             should_notify_peers = false;
3707             goto re_arm;
3708         }
3709
3710         bond_ab_arp_commit(bond);
3711
3712         rtnl_unlock();
3713         rcu_read_lock();
3714     }
3715
3716     should_notify_rtnl = bond_ab_arp_probe(bond);
3717     rcu_read_unlock();
3718
3719 re_arm:
3720     if (bond->params.arp_interval)
3721         queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3722
3723     if (should_notify_peers || should_notify_rtnl) {
3724         if (!rtnl_trylock())
3725             return;
3726
3727         if (should_notify_peers) {
3728             bond->send_peer_notif--;
3729             call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3730                          bond->dev);
3731         }
3732         if (should_notify_rtnl) {
3733             bond_slave_state_notify(bond);
3734             bond_slave_link_notify(bond);
3735         }
3736
3737         rtnl_unlock();
3738     }
3739 }
3740
3741 static void bond_arp_monitor(struct work_struct *work)
3742 {
3743     struct bonding *bond = container_of(work, struct bonding,
3744                         arp_work.work);
3745
3746     if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3747         bond_activebackup_arp_mon(bond);
3748     else
3749         bond_loadbalance_arp_mon(bond);
3750 }
3751
3752 /*-------------------------- netdev event handling --------------------------*/
3753
3754 /* Change device name */
3755 static int bond_event_changename(struct bonding *bond)
3756 {
3757     bond_remove_proc_entry(bond);
3758     bond_create_proc_entry(bond);
3759
3760     bond_debug_reregister(bond);
3761
3762     return NOTIFY_DONE;
3763 }
3764
3765 static int bond_master_netdev_event(unsigned long event,
3766                     struct net_device *bond_dev)
3767 {
3768     struct bonding *event_bond = netdev_priv(bond_dev);
3769
3770     netdev_dbg(bond_dev, "%s called\n", __func__);
3771
3772     switch (event) {
3773     case NETDEV_CHANGENAME:
3774         return bond_event_changename(event_bond);
3775     case NETDEV_UNREGISTER:
3776         bond_remove_proc_entry(event_bond);
3777 #ifdef CONFIG_XFRM_OFFLOAD
3778         xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true);
3779 #endif /* CONFIG_XFRM_OFFLOAD */
3780         break;
3781     case NETDEV_REGISTER:
3782         bond_create_proc_entry(event_bond);
3783         break;
3784     default:
3785         break;
3786     }
3787
3788     return NOTIFY_DONE;
3789 }
3790
3791 static int bond_slave_netdev_event(unsigned long event,
3792                    struct net_device *slave_dev)
3793 {
3794     struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3795     struct bonding *bond;
3796     struct net_device *bond_dev;
3797
3798     /* A netdev event can be generated while enslaving a device
3799      * before netdev_rx_handler_register is called in which case
3800      * slave will be NULL
3801      */
3802     if (!slave) {
3803         netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3804         return NOTIFY_DONE;
3805     }
3806
3807     bond_dev = slave->bond->dev;
3808     bond = slave->bond;
3809     primary = rtnl_dereference(bond->primary_slave);
3810
3811     slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3812
3813     switch (event) {
3814     case NETDEV_UNREGISTER:
3815         if (bond_dev->type != ARPHRD_ETHER)
3816             bond_release_and_destroy(bond_dev, slave_dev);
3817         else
3818             __bond_release_one(bond_dev, slave_dev, false, true);
3819         break;
3820     case NETDEV_UP:
3821     case NETDEV_CHANGE:
3822         /* For 802.3ad mode only:
3823          * Getting invalid Speed/Duplex values here will put slave
3824          * in weird state. Mark it as link-fail if the link was
3825          * previously up or link-down if it hasn't yet come up, and
3826          * let link-monitoring (miimon) set it right when correct
3827          * speeds/duplex are available.
3828          */
3829         if (bond_update_speed_duplex(slave) &&
3830             BOND_MODE(bond) == BOND_MODE_8023AD) {
3831             if (slave->last_link_up)
3832                 slave->link = BOND_LINK_FAIL;
3833             else
3834                 slave->link = BOND_LINK_DOWN;
3835         }
3836
3837         if (BOND_MODE(bond) == BOND_MODE_8023AD)
3838             bond_3ad_adapter_speed_duplex_changed(slave);
3839         fallthrough;
3840     case NETDEV_DOWN:
3841         /* Refresh slave-array if applicable!
3842          * If the setup does not use miimon or arpmon (mode-specific!),
3843          * then these events will not cause the slave-array to be
3844          * refreshed. This will cause xmit to use a slave that is not
3845          * usable. Avoid such situation by refeshing the array at these
3846          * events. If these (miimon/arpmon) parameters are configured
3847          * then array gets refreshed twice and that should be fine!
3848          */
3849         if (bond_mode_can_use_xmit_hash(bond))
3850             bond_update_slave_arr(bond, NULL);
3851         break;
3852     case NETDEV_CHANGEMTU:
3853         /* TODO: Should slaves be allowed to
3854          * independently alter their MTU?  For
3855          * an active-backup bond, slaves need
3856          * not be the same type of device, so
3857          * MTUs may vary.  For other modes,
3858          * slaves arguably should have the
3859          * same MTUs. To do this, we'd need to
3860          * take over the slave's change_mtu
3861          * function for the duration of their
3862          * servitude.
3863          */
3864         break;
3865     case NETDEV_CHANGENAME:
3866         /* we don't care if we don't have primary set */
3867         if (!bond_uses_primary(bond) ||
3868             !bond->params.primary[0])
3869             break;
3870
3871         if (slave == primary) {
3872             /* slave's name changed - he's no longer primary */
3873             RCU_INIT_POINTER(bond->primary_slave, NULL);
3874         } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3875             /* we have a new primary slave */
3876             rcu_assign_pointer(bond->primary_slave, slave);
3877         } else { /* we didn't change primary - exit */
3878             break;
3879         }
3880
3881         netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3882                 primary ? slave_dev->name : "none");
3883
3884         block_netpoll_tx();
3885         bond_select_active_slave(bond);
3886         unblock_netpoll_tx();
3887         break;
3888     case NETDEV_FEAT_CHANGE:
3889         bond_compute_features(bond);
3890         break;
3891     case NETDEV_RESEND_IGMP:
3892         /* Propagate to master device */
3893         call_netdevice_notifiers(event, slave->bond->dev);
3894         break;
3895     default:
3896         break;
3897     }
3898
3899     return NOTIFY_DONE;
3900 }
3901
3902 /* bond_netdev_event: handle netdev notifier chain events.
3903  *
3904  * This function receives events for the netdev chain.  The caller (an
3905  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3906  * locks for us to safely manipulate the slave devices (RTNL lock,
3907  * dev_probe_lock).
3908  */
3909 static int bond_netdev_event(struct notifier_block *this,
3910                  unsigned long event, void *ptr)
3911 {
3912     struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3913
3914     netdev_dbg(event_dev, "%s received %s\n",
3915            __func__, netdev_cmd_to_name(event));
3916
3917     if (!(event_dev->priv_flags & IFF_BONDING))
3918         return NOTIFY_DONE;
3919
3920     if (event_dev->flags & IFF_MASTER) {
3921         int ret;
3922
3923         ret = bond_master_netdev_event(event, event_dev);
3924         if (ret != NOTIFY_DONE)
3925             return ret;
3926     }
3927
3928     if (event_dev->flags & IFF_SLAVE)
3929         return bond_slave_netdev_event(event, event_dev);
3930
3931     return NOTIFY_DONE;
3932 }
3933
3934 static struct notifier_block bond_netdev_notifier = {
3935     .notifier_call = bond_netdev_event,
3936 };
3937
3938 /*---------------------------- Hashing Policies -----------------------------*/
3939
3940 /* Helper to access data in a packet, with or without a backing skb.
3941  * If skb is given the data is linearized if necessary via pskb_may_pull.
3942  */
3943 static inline const void *bond_pull_data(struct sk_buff *skb,
3944                      const void *data, int hlen, int n)
3945 {
3946     if (likely(n <= hlen))
3947         return data;
3948     else if (skb && likely(pskb_may_pull(skb, n)))
3949         return skb->head;
3950
3951     return NULL;
3952 }
3953
3954 /* L2 hash helper */
3955 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
3956 {
3957     struct ethhdr *ep;
3958
3959     data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
3960     if (!data)
3961         return 0;
3962
3963     ep = (struct ethhdr *)(data + mhoff);
3964     return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto);
3965 }
3966
3967 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data,
3968              int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34)
3969 {
3970     const struct ipv6hdr *iph6;
3971     const struct iphdr *iph;
3972
3973     if (l2_proto == htons(ETH_P_IP)) {
3974         data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph));
3975         if (!data)
3976             return false;
3977
3978         iph = (const struct iphdr *)(data + *nhoff);
3979         iph_to_flow_copy_v4addrs(fk, iph);
3980         *nhoff += iph->ihl << 2;
3981         if (!ip_is_fragment(iph))
3982             *ip_proto = iph->protocol;
3983     } else if (l2_proto == htons(ETH_P_IPV6)) {
3984         data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6));
3985         if (!data)
3986             return false;
3987
3988         iph6 = (const struct ipv6hdr *)(data + *nhoff);
3989         iph_to_flow_copy_v6addrs(fk, iph6);
3990         *nhoff += sizeof(*iph6);
3991         *ip_proto = iph6->nexthdr;
3992     } else {
3993         return false;
3994     }
3995
3996     if (l34 && *ip_proto >= 0)
3997         fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen);
3998
3999     return true;
4000 }
4001
4002 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4003 {
4004     u32 srcmac_vendor = 0, srcmac_dev = 0;
4005     struct ethhdr *mac_hdr;
4006     u16 vlan = 0;
4007     int i;
4008
4009     data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4010     if (!data)
4011         return 0;
4012     mac_hdr = (struct ethhdr *)(data + mhoff);
4013
4014     for (i = 0; i < 3; i++)
4015         srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];
4016
4017     for (i = 3; i < ETH_ALEN; i++)
4018         srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];
4019
4020     if (skb && skb_vlan_tag_present(skb))
4021         vlan = skb_vlan_tag_get(skb);
4022
4023     return vlan ^ srcmac_vendor ^ srcmac_dev;
4024 }
4025
4026 /* Extract the appropriate headers based on bond's xmit policy */
4027 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data,
4028                   __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk)
4029 {
4030     bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
4031     int ip_proto = -1;
4032
4033     switch (bond->params.xmit_policy) {
4034     case BOND_XMIT_POLICY_ENCAP23:
4035     case BOND_XMIT_POLICY_ENCAP34:
4036         memset(fk, 0, sizeof(*fk));
4037         return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
4038                       fk, data, l2_proto, nhoff, hlen, 0);
4039     default:
4040         break;
4041     }
4042
4043     fk->ports.ports = 0;
4044     memset(&fk->icmp, 0, sizeof(fk->icmp));
4045     if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34))
4046         return false;
4047
4048     /* ICMP error packets contains at least 8 bytes of the header
4049      * of the packet which generated the error. Use this information
4050      * to correlate ICMP error packets within the same flow which
4051      * generated the error.
4052      */
4053     if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) {
4054         skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen);
4055         if (ip_proto == IPPROTO_ICMP) {
4056             if (!icmp_is_err(fk->icmp.type))
4057                 return true;
4058
4059             nhoff += sizeof(struct icmphdr);
4060         } else if (ip_proto == IPPROTO_ICMPV6) {
4061             if (!icmpv6_is_err(fk->icmp.type))
4062                 return true;
4063
4064             nhoff += sizeof(struct icmp6hdr);
4065         }
4066         return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34);
4067     }
4068
4069     return true;
4070 }
4071
4072 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy)
4073 {
4074     hash ^= (__force u32)flow_get_u32_dst(flow) ^
4075         (__force u32)flow_get_u32_src(flow);
4076     hash ^= (hash >> 16);
4077     hash ^= (hash >> 8);
4078
4079     /* discard lowest hash bit to deal with the common even ports pattern */
4080     if (xmit_policy == BOND_XMIT_POLICY_LAYER34 ||
4081         xmit_policy == BOND_XMIT_POLICY_ENCAP34)
4082         return hash >> 1;
4083
4084     return hash;
4085 }
4086
4087 /* Generate hash based on xmit policy. If @skb is given it is used to linearize
4088  * the data as required, but this function can be used without it if the data is
4089  * known to be linear (e.g. with xdp_buff).
4090  */
4091 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data,
4092                 __be16 l2_proto, int mhoff, int nhoff, int hlen)
4093 {
4094     struct flow_keys flow;
4095     u32 hash;
4096
4097     if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
4098         return bond_vlan_srcmac_hash(skb, data, mhoff, hlen);
4099
4100     if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
4101         !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow))
4102         return bond_eth_hash(skb, data, mhoff, hlen);
4103
4104     if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
4105         bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
4106         hash = bond_eth_hash(skb, data, mhoff, hlen);
4107     } else {
4108         if (flow.icmp.id)
4109             memcpy(&hash, &flow.icmp, sizeof(hash));
4110         else
4111             memcpy(&hash, &flow.ports.ports, sizeof(hash));
4112     }
4113
4114     return bond_ip_hash(hash, &flow, bond->params.xmit_policy);
4115 }
4116
4117 /**
4118  * bond_xmit_hash - generate a hash value based on the xmit policy
4119  * @bond: bonding device
4120  * @skb: buffer to use for headers
4121  *
4122  * This function will extract the necessary headers from the skb buffer and use
4123  * them to generate a hash based on the xmit_policy set in the bonding device
4124  */
4125 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
4126 {
4127     if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
4128         skb->l4_hash)
4129         return skb->hash;
4130
4131     return __bond_xmit_hash(bond, skb, skb->data, skb->protocol,
4132                 skb_mac_offset(skb), skb_network_offset(skb),
4133                 skb_headlen(skb));
4134 }
4135
4136 /**
4137  * bond_xmit_hash_xdp - generate a hash value based on the xmit policy
4138  * @bond: bonding device
4139  * @xdp: buffer to use for headers
4140  *
4141  * The XDP variant of bond_xmit_hash.
4142  */
4143 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp)
4144 {
4145     struct ethhdr *eth;
4146
4147     if (xdp->data + sizeof(struct ethhdr) > xdp->data_end)
4148         return 0;
4149
4150     eth = (struct ethhdr *)xdp->data;
4151
4152     return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0,
4153                 sizeof(struct ethhdr), xdp->data_end - xdp->data);
4154 }
4155
4156 /*-------------------------- Device entry points ----------------------------*/
4157
4158 void bond_work_init_all(struct bonding *bond)
4159 {
4160     INIT_DELAYED_WORK(&bond->mcast_work,
4161               bond_resend_igmp_join_requests_delayed);
4162     INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
4163     INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
4164     INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
4165     INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
4166     INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
4167 }
4168
4169 static void bond_work_cancel_all(struct bonding *bond)
4170 {
4171     cancel_delayed_work_sync(&bond->mii_work);
4172     cancel_delayed_work_sync(&bond->arp_work);
4173     cancel_delayed_work_sync(&bond->alb_work);
4174     cancel_delayed_work_sync(&bond->ad_work);
4175     cancel_delayed_work_sync(&bond->mcast_work);
4176     cancel_delayed_work_sync(&bond->slave_arr_work);
4177 }
4178
4179 static int bond_open(struct net_device *bond_dev)
4180 {
4181     struct bonding *bond = netdev_priv(bond_dev);
4182     struct list_head *iter;
4183     struct slave *slave;
4184
4185     if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) {
4186         bond->rr_tx_counter = alloc_percpu(u32);
4187         if (!bond->rr_tx_counter)
4188             return -ENOMEM;
4189     }
4190
4191     /* reset slave->backup and slave->inactive */
4192     if (bond_has_slaves(bond)) {
4193         bond_for_each_slave(bond, slave, iter) {
4194             if (bond_uses_primary(bond) &&
4195                 slave != rcu_access_pointer(bond->curr_active_slave)) {
4196                 bond_set_slave_inactive_flags(slave,
4197                                   BOND_SLAVE_NOTIFY_NOW);
4198             } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
4199                 bond_set_slave_active_flags(slave,
4200                                 BOND_SLAVE_NOTIFY_NOW);
4201             }
4202         }
4203     }
4204
4205     if (bond_is_lb(bond)) {
4206         /* bond_alb_initialize must be called before the timer
4207          * is started.
4208          */
4209         if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
4210             return -ENOMEM;
4211         if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
4212             queue_delayed_work(bond->wq, &bond->alb_work, 0);
4213     }
4214
4215     if (bond->params.miimon)  /* link check interval, in milliseconds. */
4216         queue_delayed_work(bond->wq, &bond->mii_work, 0);
4217
4218     if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
4219         queue_delayed_work(bond->wq, &bond->arp_work, 0);
4220         bond->recv_probe = bond_rcv_validate;
4221     }
4222
4223     if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4224         queue_delayed_work(bond->wq, &bond->ad_work, 0);
4225         /* register to receive LACPDUs */
4226         bond->recv_probe = bond_3ad_lacpdu_recv;
4227         bond_3ad_initiate_agg_selection(bond, 1);
4228
4229         bond_for_each_slave(bond, slave, iter)
4230             dev_mc_add(slave->dev, lacpdu_mcast_addr);
4231     }
4232
4233     if (bond_mode_can_use_xmit_hash(bond))
4234         bond_update_slave_arr(bond, NULL);
4235
4236     return 0;
4237 }
4238
4239 static int bond_close(struct net_device *bond_dev)
4240 {
4241     struct bonding *bond = netdev_priv(bond_dev);
4242     struct slave *slave;
4243
4244     bond_work_cancel_all(bond);
4245     bond->send_peer_notif = 0;
4246     if (bond_is_lb(bond))
4247         bond_alb_deinitialize(bond);
4248     bond->recv_probe = NULL;
4249
4250     if (bond_uses_primary(bond)) {
4251         rcu_read_lock();
4252         slave = rcu_dereference(bond->curr_active_slave);
4253         if (slave)
4254             bond_hw_addr_flush(bond_dev, slave->dev);
4255         rcu_read_unlock();
4256     } else {
4257         struct list_head *iter;
4258
4259         bond_for_each_slave(bond, slave, iter)
4260             bond_hw_addr_flush(bond_dev, slave->dev);
4261     }
4262
4263     return 0;
4264 }
4265
4266 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
4267  * that some drivers can provide 32bit values only.
4268  */
4269 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
4270                 const struct rtnl_link_stats64 *_new,
4271                 const struct rtnl_link_stats64 *_old)
4272 {
4273     const u64 *new = (const u64 *)_new;
4274     const u64 *old = (const u64 *)_old;
4275     u64 *res = (u64 *)_res;
4276     int i;
4277
4278     for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
4279         u64 nv = new[i];
4280         u64 ov = old[i];
4281         s64 delta = nv - ov;
4282
4283         /* detects if this particular field is 32bit only */
4284         if (((nv | ov) >> 32) == 0)
4285             delta = (s64)(s32)((u32)nv - (u32)ov);
4286
4287         /* filter anomalies, some drivers reset their stats
4288          * at down/up events.
4289          */
4290         if (delta > 0)
4291             res[i] += delta;
4292     }
4293 }
4294
4295 #ifdef CONFIG_LOCKDEP
4296 static int bond_get_lowest_level_rcu(struct net_device *dev)
4297 {
4298     struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
4299     struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
4300     int cur = 0, max = 0;
4301
4302     now = dev;
4303     iter = &dev->adj_list.lower;
4304
4305     while (1) {
4306         next = NULL;
4307         while (1) {
4308             ldev = netdev_next_lower_dev_rcu(now, &iter);
4309             if (!ldev)
4310                 break;
4311
4312             next = ldev;
4313             niter = &ldev->adj_list.lower;
4314             dev_stack[cur] = now;
4315             iter_stack[cur++] = iter;
4316             if (max <= cur)
4317                 max = cur;
4318             break;
4319         }
4320
4321         if (!next) {
4322             if (!cur)
4323                 return max;
4324             next = dev_stack[--cur];
4325             niter = iter_stack[cur];
4326         }
4327
4328         now = next;
4329         iter = niter;
4330     }
4331
4332     return max;
4333 }
4334 #endif
4335
4336 static void bond_get_stats(struct net_device *bond_dev,
4337                struct rtnl_link_stats64 *stats)
4338 {
4339     struct bonding *bond = netdev_priv(bond_dev);
4340     struct rtnl_link_stats64 temp;
4341     struct list_head *iter;
4342     struct slave *slave;
4343     int nest_level = 0;
4344
4345
4346     rcu_read_lock();
4347 #ifdef CONFIG_LOCKDEP
4348     nest_level = bond_get_lowest_level_rcu(bond_dev);
4349 #endif
4350
4351     spin_lock_nested(&bond->stats_lock, nest_level);
4352     memcpy(stats, &bond->bond_stats, sizeof(*stats));
4353
4354     bond_for_each_slave_rcu(bond, slave, iter) {
4355         const struct rtnl_link_stats64 *new =
4356             dev_get_stats(slave->dev, &temp);
4357
4358         bond_fold_stats(stats, new, &slave->slave_stats);
4359
4360         /* save off the slave stats for the next run */
4361         memcpy(&slave->slave_stats, new, sizeof(*new));
4362     }
4363
4364     memcpy(&bond->bond_stats, stats, sizeof(*stats));
4365     spin_unlock(&bond->stats_lock);
4366     rcu_read_unlock();
4367 }
4368
4369 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4370 {
4371     struct bonding *bond = netdev_priv(bond_dev);
4372     struct mii_ioctl_data *mii = NULL;
4373     const struct net_device_ops *ops;
4374     struct net_device *real_dev;
4375     struct hwtstamp_config cfg;
4376     struct ifreq ifrr;
4377     int res = 0;
4378
4379     netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd);
4380
4381     switch (cmd) {
4382     case SIOCGMIIPHY:
4383         mii = if_mii(ifr);
4384         if (!mii)
4385             return -EINVAL;
4386
4387         mii->phy_id = 0;
4388         fallthrough;
4389     case SIOCGMIIREG:
4390         /* We do this again just in case we were called by SIOCGMIIREG
4391          * instead of SIOCGMIIPHY.
4392          */
4393         mii = if_mii(ifr);
4394         if (!mii)
4395             return -EINVAL;
4396
4397         if (mii->reg_num == 1) {
4398             mii->val_out = 0;
4399             if (netif_carrier_ok(bond->dev))
4400                 mii->val_out = BMSR_LSTATUS;
4401         }
4402
4403         break;
4404     case SIOCSHWTSTAMP:
4405         if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
4406             return -EFAULT;
4407
4408         if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX))
4409             return -EOPNOTSUPP;
4410
4411         fallthrough;
4412     case SIOCGHWTSTAMP:
4413         real_dev = bond_option_active_slave_get_rcu(bond);
4414         if (!real_dev)
4415             return -EOPNOTSUPP;
4416
4417         strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
4418         ifrr.ifr_ifru = ifr->ifr_ifru;
4419
4420         ops = real_dev->netdev_ops;
4421         if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) {
4422             res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
4423             if (res)
4424                 return res;
4425
4426             ifr->ifr_ifru = ifrr.ifr_ifru;
4427             if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
4428                 return -EFAULT;
4429
4430             /* Set the BOND_PHC_INDEX flag to notify user space */
4431             cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
4432
4433             return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ?
4434                 -EFAULT : 0;
4435         }
4436         fallthrough;
4437     default:
4438         res = -EOPNOTSUPP;
4439     }
4440
4441     return res;
4442 }
4443
4444 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4445 {
4446     struct bonding *bond = netdev_priv(bond_dev);
4447     struct net_device *slave_dev = NULL;
4448     struct ifbond k_binfo;
4449     struct ifbond __user *u_binfo = NULL;
4450     struct ifslave k_sinfo;
4451     struct ifslave __user *u_sinfo = NULL;
4452     struct bond_opt_value newval;
4453     struct net *net;
4454     int res = 0;
4455
4456     netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
4457
4458     switch (cmd) {
4459     case SIOCBONDINFOQUERY:
4460         u_binfo = (struct ifbond __user *)ifr->ifr_data;
4461
4462         if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
4463             return -EFAULT;
4464
4465         bond_info_query(bond_dev, &k_binfo);
4466         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
4467             return -EFAULT;
4468
4469         return 0;
4470     case SIOCBONDSLAVEINFOQUERY:
4471         u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4472
4473         if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
4474             return -EFAULT;
4475
4476         res = bond_slave_info_query(bond_dev, &k_sinfo);
4477         if (res == 0 &&
4478             copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
4479             return -EFAULT;
4480
4481         return res;
4482     default:
4483         break;
4484     }
4485
4486     net = dev_net(bond_dev);
4487
4488     if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4489         return -EPERM;
4490
4491     slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
4492
4493     slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
4494
4495     if (!slave_dev)
4496         return -ENODEV;
4497
4498     switch (cmd) {
4499     case SIOCBONDENSLAVE:
4500         res = bond_enslave(bond_dev, slave_dev, NULL);
4501         break;
4502     case SIOCBONDRELEASE:
4503         res = bond_release(bond_dev, slave_dev);
4504         break;
4505     case SIOCBONDSETHWADDR:
4506         res = bond_set_dev_addr(bond_dev, slave_dev);
4507         break;
4508     case SIOCBONDCHANGEACTIVE:
4509         bond_opt_initstr(&newval, slave_dev->name);
4510         res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
4511                         &newval);
4512         break;
4513     default:
4514         res = -EOPNOTSUPP;
4515     }
4516
4517     return res;
4518 }
4519
4520 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr,
4521                    void __user *data, int cmd)
4522 {
4523     struct ifreq ifrdata = { .ifr_data = data };
4524
4525     switch (cmd) {
4526     case BOND_INFO_QUERY_OLD:
4527         return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY);
4528     case BOND_SLAVE_INFO_QUERY_OLD:
4529         return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY);
4530     case BOND_ENSLAVE_OLD:
4531         return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE);
4532     case BOND_RELEASE_OLD:
4533         return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE);
4534     case BOND_SETHWADDR_OLD:
4535         return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR);
4536     case BOND_CHANGE_ACTIVE_OLD:
4537         return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE);
4538     }
4539
4540     return -EOPNOTSUPP;
4541 }
4542
4543 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
4544 {
4545     struct bonding *bond = netdev_priv(bond_dev);
4546
4547     if (change & IFF_PROMISC)
4548         bond_set_promiscuity(bond,
4549                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
4550
4551     if (change & IFF_ALLMULTI)
4552         bond_set_allmulti(bond,
4553                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
4554 }
4555
4556 static void bond_set_rx_mode(struct net_device *bond_dev)
4557 {
4558     struct bonding *bond = netdev_priv(bond_dev);
4559     struct list_head *iter;
4560     struct slave *slave;
4561
4562     rcu_read_lock();
4563     if (bond_uses_primary(bond)) {
4564         slave = rcu_dereference(bond->curr_active_slave);
4565         if (slave) {
4566             dev_uc_sync(slave->dev, bond_dev);
4567             dev_mc_sync(slave->dev, bond_dev);
4568         }
4569     } else {
4570         bond_for_each_slave_rcu(bond, slave, iter) {
4571             dev_uc_sync_multiple(slave->dev, bond_dev);
4572             dev_mc_sync_multiple(slave->dev, bond_dev);
4573         }
4574     }
4575     rcu_read_unlock();
4576 }
4577
4578 static int bond_neigh_init(struct neighbour *n)
4579 {
4580     struct bonding *bond = netdev_priv(n->dev);
4581     const struct net_device_ops *slave_ops;
4582     struct neigh_parms parms;
4583     struct slave *slave;
4584     int ret = 0;
4585
4586     rcu_read_lock();
4587     slave = bond_first_slave_rcu(bond);
4588     if (!slave)
4589         goto out;
4590     slave_ops = slave->dev->netdev_ops;
4591     if (!slave_ops->ndo_neigh_setup)
4592         goto out;
4593
4594     /* TODO: find another way [1] to implement this.
4595      * Passing a zeroed structure is fragile,
4596      * but at least we do not pass garbage.
4597      *
4598      * [1] One way would be that ndo_neigh_setup() never touch
4599      *     struct neigh_parms, but propagate the new neigh_setup()
4600      *     back to ___neigh_create() / neigh_parms_alloc()
4601      */
4602     memset(&parms, 0, sizeof(parms));
4603     ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
4604
4605     if (ret)
4606         goto out;
4607
4608     if (parms.neigh_setup)
4609         ret = parms.neigh_setup(n);
4610 out:
4611     rcu_read_unlock();
4612     return ret;
4613 }
4614
4615 /* The bonding ndo_neigh_setup is called at init time beofre any
4616  * slave exists. So we must declare proxy setup function which will
4617  * be used at run time to resolve the actual slave neigh param setup.
4618  *
4619  * It's also called by master devices (such as vlans) to setup their
4620  * underlying devices. In that case - do nothing, we're already set up from
4621  * our init.
4622  */
4623 static int bond_neigh_setup(struct net_device *dev,
4624                 struct neigh_parms *parms)
4625 {
4626     /* modify only our neigh_parms */
4627     if (parms->dev == dev)
4628         parms->neigh_setup = bond_neigh_init;
4629
4630     return 0;
4631 }
4632
4633 /* Change the MTU of all of a master's slaves to match the master */
4634 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4635 {
4636     struct bonding *bond = netdev_priv(bond_dev);
4637     struct slave *slave, *rollback_slave;
4638     struct list_head *iter;
4639     int res = 0;
4640
4641     netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4642
4643     bond_for_each_slave(bond, slave, iter) {
4644         slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4645                slave, slave->dev->netdev_ops->ndo_change_mtu);
4646
4647         res = dev_set_mtu(slave->dev, new_mtu);
4648
4649         if (res) {
4650             /* If we failed to set the slave's mtu to the new value
4651              * we must abort the operation even in ACTIVE_BACKUP
4652              * mode, because if we allow the backup slaves to have
4653              * different mtu values than the active slave we'll
4654              * need to change their mtu when doing a failover. That
4655              * means changing their mtu from timer context, which
4656              * is probably not a good idea.
4657              */
4658             slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4659                   res, new_mtu);
4660             goto unwind;
4661         }
4662     }
4663
4664     bond_dev->mtu = new_mtu;
4665
4666     return 0;
4667
4668 unwind:
4669     /* unwind from head to the slave that failed */
4670     bond_for_each_slave(bond, rollback_slave, iter) {
4671         int tmp_res;
4672
4673         if (rollback_slave == slave)
4674             break;
4675
4676         tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4677         if (tmp_res)
4678             slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4679                   tmp_res);
4680     }
4681
4682     return res;
4683 }
4684
4685 /* Change HW address
4686  *
4687  * Note that many devices must be down to change the HW address, and
4688  * downing the master releases all slaves.  We can make bonds full of
4689  * bonding devices to test this, however.
4690  */
4691 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4692 {
4693     struct bonding *bond = netdev_priv(bond_dev);
4694     struct slave *slave, *rollback_slave;
4695     struct sockaddr_storage *ss = addr, tmp_ss;
4696     struct list_head *iter;
4697     int res = 0;
4698
4699     if (BOND_MODE(bond) == BOND_MODE_ALB)
4700         return bond_alb_set_mac_address(bond_dev, addr);
4701
4702
4703     netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4704
4705     /* If fail_over_mac is enabled, do nothing and return success.
4706      * Returning an error causes ifenslave to fail.
4707      */
4708     if (bond->params.fail_over_mac &&
4709         BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4710         return 0;
4711
4712     if (!is_valid_ether_addr(ss->__data))
4713         return -EADDRNOTAVAIL;
4714
4715     bond_for_each_slave(bond, slave, iter) {
4716         slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4717               __func__, slave);
4718         res = dev_set_mac_address(slave->dev, addr, NULL);
4719         if (res) {
4720             /* TODO: consider downing the slave
4721              * and retry ?
4722              * User should expect communications
4723              * breakage anyway until ARP finish
4724              * updating, so...
4725              */
4726             slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4727                   __func__, res);
4728             goto unwind;
4729         }
4730     }
4731
4732     /* success */
4733     dev_addr_set(bond_dev, ss->__data);
4734     return 0;
4735
4736 unwind:
4737     memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4738     tmp_ss.ss_family = bond_dev->type;
4739
4740     /* unwind from head to the slave that failed */
4741     bond_for_each_slave(bond, rollback_slave, iter) {
4742         int tmp_res;
4743
4744         if (rollback_slave == slave)
4745             break;
4746
4747         tmp_res = dev_set_mac_address(rollback_slave->dev,
4748                           (struct sockaddr *)&tmp_ss, NULL);
4749         if (tmp_res) {
4750             slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4751                    __func__, tmp_res);
4752         }
4753     }
4754
4755     return res;
4756 }
4757
4758 /**
4759  * bond_get_slave_by_id - get xmit slave with slave_id
4760  * @bond: bonding device that is transmitting
4761  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4762  *
4763  * This function tries to get slave with slave_id but in case
4764  * it fails, it tries to find the first available slave for transmission.
4765  */
4766 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4767                       int slave_id)
4768 {
4769     struct list_head *iter;
4770     struct slave *slave;
4771     int i = slave_id;
4772
4773     /* Here we start from the slave with slave_id */
4774     bond_for_each_slave_rcu(bond, slave, iter) {
4775         if (--i < 0) {
4776             if (bond_slave_can_tx(slave))
4777                 return slave;
4778         }
4779     }
4780
4781     /* Here we start from the first slave up to slave_id */
4782     i = slave_id;
4783     bond_for_each_slave_rcu(bond, slave, iter) {
4784         if (--i < 0)
4785             break;
4786         if (bond_slave_can_tx(slave))
4787             return slave;
4788     }
4789     /* no slave that can tx has been found */
4790     return NULL;
4791 }
4792
4793 /**
4794  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4795  * @bond: bonding device to use
4796  *
4797  * Based on the value of the bonding device's packets_per_slave parameter
4798  * this function generates a slave id, which is usually used as the next
4799  * slave to transmit through.
4800  */
4801 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4802 {
4803     u32 slave_id;
4804     struct reciprocal_value reciprocal_packets_per_slave;
4805     int packets_per_slave = bond->params.packets_per_slave;
4806
4807     switch (packets_per_slave) {
4808     case 0:
4809         slave_id = prandom_u32();
4810         break;
4811     case 1:
4812         slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4813         break;
4814     default:
4815         reciprocal_packets_per_slave =
4816             bond->params.reciprocal_packets_per_slave;
4817         slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4818         slave_id = reciprocal_divide(slave_id,
4819                          reciprocal_packets_per_slave);
4820         break;
4821     }
4822
4823     return slave_id;
4824 }
4825
4826 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4827                             struct sk_buff *skb)
4828 {
4829     struct slave *slave;
4830     int slave_cnt;
4831     u32 slave_id;
4832
4833     /* Start with the curr_active_slave that joined the bond as the
4834      * default for sending IGMP traffic.  For failover purposes one
4835      * needs to maintain some consistency for the interface that will
4836      * send the join/membership reports.  The curr_active_slave found
4837      * will send all of this type of traffic.
4838      */
4839     if (skb->protocol == htons(ETH_P_IP)) {
4840         int noff = skb_network_offset(skb);
4841         struct iphdr *iph;
4842
4843         if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4844             goto non_igmp;
4845
4846         iph = ip_hdr(skb);
4847         if (iph->protocol == IPPROTO_IGMP) {
4848             slave = rcu_dereference(bond->curr_active_slave);
4849             if (slave)
4850                 return slave;
4851             return bond_get_slave_by_id(bond, 0);
4852         }
4853     }
4854
4855 non_igmp:
4856     slave_cnt = READ_ONCE(bond->slave_cnt);
4857     if (likely(slave_cnt)) {
4858         slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4859         return bond_get_slave_by_id(bond, slave_id);
4860     }
4861     return NULL;
4862 }
4863
4864 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond,
4865                             struct xdp_buff *xdp)
4866 {
4867     struct slave *slave;
4868     int slave_cnt;
4869     u32 slave_id;
4870     const struct ethhdr *eth;
4871     void *data = xdp->data;
4872
4873     if (data + sizeof(struct ethhdr) > xdp->data_end)
4874         goto non_igmp;
4875
4876     eth = (struct ethhdr *)data;
4877     data += sizeof(struct ethhdr);
4878
4879     /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */
4880     if (eth->h_proto == htons(ETH_P_IP)) {
4881         const struct iphdr *iph;
4882
4883         if (data + sizeof(struct iphdr) > xdp->data_end)
4884             goto non_igmp;
4885
4886         iph = (struct iphdr *)data;
4887
4888         if (iph->protocol == IPPROTO_IGMP) {
4889             slave = rcu_dereference(bond->curr_active_slave);
4890             if (slave)
4891                 return slave;
4892             return bond_get_slave_by_id(bond, 0);
4893         }
4894     }
4895
4896 non_igmp:
4897     slave_cnt = READ_ONCE(bond->slave_cnt);
4898     if (likely(slave_cnt)) {
4899         slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4900         return bond_get_slave_by_id(bond, slave_id);
4901     }
4902     return NULL;
4903 }
4904
4905 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4906                     struct net_device *bond_dev)
4907 {
4908     struct bonding *bond = netdev_priv(bond_dev);
4909     struct slave *slave;
4910
4911     slave = bond_xmit_roundrobin_slave_get(bond, skb);
4912     if (likely(slave))
4913         return bond_dev_queue_xmit(bond, skb, slave->dev);
4914
4915     return bond_tx_drop(bond_dev, skb);
4916 }
4917
4918 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond)
4919 {
4920     return rcu_dereference(bond->curr_active_slave);
4921 }
4922
4923 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4924  * the bond has a usable interface.
4925  */
4926 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4927                       struct net_device *bond_dev)
4928 {
4929     struct bonding *bond = netdev_priv(bond_dev);
4930     struct slave *slave;
4931
4932     slave = bond_xmit_activebackup_slave_get(bond);
4933     if (slave)
4934         return bond_dev_queue_xmit(bond, skb, slave->dev);
4935
4936     return bond_tx_drop(bond_dev, skb);
4937 }
4938
4939 /* Use this to update slave_array when (a) it's not appropriate to update
4940  * slave_array right away (note that update_slave_array() may sleep)
4941  * and / or (b) RTNL is not held.
4942  */
4943 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4944 {
4945     queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4946 }
4947
4948 /* Slave array work handler. Holds only RTNL */
4949 static void bond_slave_arr_handler(struct work_struct *work)
4950 {
4951     struct bonding *bond = container_of(work, struct bonding,
4952                         slave_arr_work.work);
4953     int ret;
4954
4955     if (!rtnl_trylock())
4956         goto err;
4957
4958     ret = bond_update_slave_arr(bond, NULL);
4959     rtnl_unlock();
4960     if (ret) {
4961         pr_warn_ratelimited("Failed to update slave array from WT\n");
4962         goto err;
4963     }
4964     return;
4965
4966 err:
4967     bond_slave_arr_work_rearm(bond, 1);
4968 }
4969
4970 static void bond_skip_slave(struct bond_up_slave *slaves,
4971                 struct slave *skipslave)
4972 {
4973     int idx;
4974
4975     /* Rare situation where caller has asked to skip a specific
4976      * slave but allocation failed (most likely!). BTW this is
4977      * only possible when the call is initiated from
4978      * __bond_release_one(). In this situation; overwrite the
4979      * skipslave entry in the array with the last entry from the
4980      * array to avoid a situation where the xmit path may choose
4981      * this to-be-skipped slave to send a packet out.
4982      */
4983     for (idx = 0; slaves && idx < slaves->count; idx++) {
4984         if (skipslave == slaves->arr[idx]) {
4985             slaves->arr[idx] =
4986                 slaves->arr[slaves->count - 1];
4987             slaves->count--;
4988             break;
4989         }
4990     }
4991 }
4992
4993 static void bond_set_slave_arr(struct bonding *bond,
4994                    struct bond_up_slave *usable_slaves,
4995                    struct bond_up_slave *all_slaves)
4996 {
4997     struct bond_up_slave *usable, *all;
4998
4999     usable = rtnl_dereference(bond->usable_slaves);
5000     rcu_assign_pointer(bond->usable_slaves, usable_slaves);
5001     kfree_rcu(usable, rcu);
5002
5003     all = rtnl_dereference(bond->all_slaves);
5004     rcu_assign_pointer(bond->all_slaves, all_slaves);
5005     kfree_rcu(all, rcu);
5006 }
5007
5008 static void bond_reset_slave_arr(struct bonding *bond)
5009 {
5010     struct bond_up_slave *usable, *all;
5011
5012     usable = rtnl_dereference(bond->usable_slaves);
5013     if (usable) {
5014         RCU_INIT_POINTER(bond->usable_slaves, NULL);
5015         kfree_rcu(usable, rcu);
5016     }
5017
5018     all = rtnl_dereference(bond->all_slaves);
5019     if (all) {
5020         RCU_INIT_POINTER(bond->all_slaves, NULL);
5021         kfree_rcu(all, rcu);
5022     }
5023 }
5024
5025 /* Build the usable slaves array in control path for modes that use xmit-hash
5026  * to determine the slave interface -
5027  * (a) BOND_MODE_8023AD
5028  * (b) BOND_MODE_XOR
5029  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
5030  *
5031  * The caller is expected to hold RTNL only and NO other lock!
5032  */
5033 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
5034 {
5035     struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
5036     struct slave *slave;
5037     struct list_head *iter;
5038     int agg_id = 0;
5039     int ret = 0;
5040
5041     might_sleep();
5042
5043     usable_slaves = kzalloc(struct_size(usable_slaves, arr,
5044                         bond->slave_cnt), GFP_KERNEL);
5045     all_slaves = kzalloc(struct_size(all_slaves, arr,
5046                      bond->slave_cnt), GFP_KERNEL);
5047     if (!usable_slaves || !all_slaves) {
5048         ret = -ENOMEM;
5049         goto out;
5050     }
5051     if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5052         struct ad_info ad_info;
5053
5054         spin_lock_bh(&bond->mode_lock);
5055         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
5056             spin_unlock_bh(&bond->mode_lock);
5057             pr_debug("bond_3ad_get_active_agg_info failed\n");
5058             /* No active aggragator means it's not safe to use
5059              * the previous array.
5060              */
5061             bond_reset_slave_arr(bond);
5062             goto out;
5063         }
5064         spin_unlock_bh(&bond->mode_lock);
5065         agg_id = ad_info.aggregator_id;
5066     }
5067     bond_for_each_slave(bond, slave, iter) {
5068         if (skipslave == slave)
5069             continue;
5070
5071         all_slaves->arr[all_slaves->count++] = slave;
5072         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5073             struct aggregator *agg;
5074
5075             agg = SLAVE_AD_INFO(slave)->port.aggregator;
5076             if (!agg || agg->aggregator_identifier != agg_id)
5077                 continue;
5078         }
5079         if (!bond_slave_can_tx(slave))
5080             continue;
5081
5082         slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
5083               usable_slaves->count);
5084
5085         usable_slaves->arr[usable_slaves->count++] = slave;
5086     }
5087
5088     bond_set_slave_arr(bond, usable_slaves, all_slaves);
5089     return ret;
5090 out:
5091     if (ret != 0 && skipslave) {
5092         bond_skip_slave(rtnl_dereference(bond->all_slaves),
5093                 skipslave);
5094         bond_skip_slave(rtnl_dereference(bond->usable_slaves),
5095                 skipslave);
5096     }
5097     kfree_rcu(all_slaves, rcu);
5098     kfree_rcu(usable_slaves, rcu);
5099
5100     return ret;
5101 }
5102
5103 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
5104                          struct sk_buff *skb,
5105                          struct bond_up_slave *slaves)
5106 {
5107     struct slave *slave;
5108     unsigned int count;
5109     u32 hash;
5110
5111     hash = bond_xmit_hash(bond, skb);
5112     count = slaves ? READ_ONCE(slaves->count) : 0;
5113     if (unlikely(!count))
5114         return NULL;
5115
5116     slave = slaves->arr[hash % count];
5117     return slave;
5118 }
5119
5120 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond,
5121                              struct xdp_buff *xdp)
5122 {
5123     struct bond_up_slave *slaves;
5124     unsigned int count;
5125     u32 hash;
5126
5127     hash = bond_xmit_hash_xdp(bond, xdp);
5128     slaves = rcu_dereference(bond->usable_slaves);
5129     count = slaves ? READ_ONCE(slaves->count) : 0;
5130     if (unlikely(!count))
5131         return NULL;
5132
5133     return slaves->arr[hash % count];
5134 }
5135
5136 /* Use this Xmit function for 3AD as well as XOR modes. The current
5137  * usable slave array is formed in the control path. The xmit function
5138  * just calculates hash and sends the packet out.
5139  */
5140 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
5141                      struct net_device *dev)
5142 {
5143     struct bonding *bond = netdev_priv(dev);
5144     struct bond_up_slave *slaves;
5145     struct slave *slave;
5146
5147     slaves = rcu_dereference(bond->usable_slaves);
5148     slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5149     if (likely(slave))
5150         return bond_dev_queue_xmit(bond, skb, slave->dev);
5151
5152     return bond_tx_drop(dev, skb);
5153 }
5154
5155 /* in broadcast mode, we send everything to all usable interfaces. */
5156 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
5157                        struct net_device *bond_dev)
5158 {
5159     struct bonding *bond = netdev_priv(bond_dev);
5160     struct slave *slave = NULL;
5161     struct list_head *iter;
5162     bool xmit_suc = false;
5163     bool skb_used = false;
5164
5165     bond_for_each_slave_rcu(bond, slave, iter) {
5166         struct sk_buff *skb2;
5167
5168         if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP))
5169             continue;
5170
5171         if (bond_is_last_slave(bond, slave)) {
5172             skb2 = skb;
5173             skb_used = true;
5174         } else {
5175             skb2 = skb_clone(skb, GFP_ATOMIC);
5176             if (!skb2) {
5177                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
5178                             bond_dev->name, __func__);
5179                 continue;
5180             }
5181         }
5182
5183         if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK)
5184             xmit_suc = true;
5185     }
5186
5187     if (!skb_used)
5188         dev_kfree_skb_any(skb);
5189
5190     if (xmit_suc)
5191         return NETDEV_TX_OK;
5192
5193     dev_core_stats_tx_dropped_inc(bond_dev);
5194     return NET_XMIT_DROP;
5195 }
5196
5197 /*------------------------- Device initialization ---------------------------*/
5198
5199 /* Lookup the slave that corresponds to a qid */
5200 static inline int bond_slave_override(struct bonding *bond,
5201                       struct sk_buff *skb)
5202 {
5203     struct slave *slave = NULL;
5204     struct list_head *iter;
5205
5206     if (!skb_rx_queue_recorded(skb))
5207         return 1;
5208
5209     /* Find out if any slaves have the same mapping as this skb. */
5210     bond_for_each_slave_rcu(bond, slave, iter) {
5211         if (slave->queue_id == skb_get_queue_mapping(skb)) {
5212             if (bond_slave_is_up(slave) &&
5213                 slave->link == BOND_LINK_UP) {
5214                 bond_dev_queue_xmit(bond, skb, slave->dev);
5215                 return 0;
5216             }
5217             /* If the slave isn't UP, use default transmit policy. */
5218             break;
5219         }
5220     }
5221
5222     return 1;
5223 }
5224
5225
5226 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
5227                  struct net_device *sb_dev)
5228 {
5229     /* This helper function exists to help dev_pick_tx get the correct
5230      * destination queue.  Using a helper function skips a call to
5231      * skb_tx_hash and will put the skbs in the queue we expect on their
5232      * way down to the bonding driver.
5233      */
5234     u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
5235
5236     /* Save the original txq to restore before passing to the driver */
5237     qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
5238
5239     if (unlikely(txq >= dev->real_num_tx_queues)) {
5240         do {
5241             txq -= dev->real_num_tx_queues;
5242         } while (txq >= dev->real_num_tx_queues);
5243     }
5244     return txq;
5245 }
5246
5247 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
5248                           struct sk_buff *skb,
5249                           bool all_slaves)
5250 {
5251     struct bonding *bond = netdev_priv(master_dev);
5252     struct bond_up_slave *slaves;
5253     struct slave *slave = NULL;
5254
5255     switch (BOND_MODE(bond)) {
5256     case BOND_MODE_ROUNDROBIN:
5257         slave = bond_xmit_roundrobin_slave_get(bond, skb);
5258         break;
5259     case BOND_MODE_ACTIVEBACKUP:
5260         slave = bond_xmit_activebackup_slave_get(bond);
5261         break;
5262     case BOND_MODE_8023AD:
5263     case BOND_MODE_XOR:
5264         if (all_slaves)
5265             slaves = rcu_dereference(bond->all_slaves);
5266         else
5267             slaves = rcu_dereference(bond->usable_slaves);
5268         slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5269         break;
5270     case BOND_MODE_BROADCAST:
5271         break;
5272     case BOND_MODE_ALB:
5273         slave = bond_xmit_alb_slave_get(bond, skb);
5274         break;
5275     case BOND_MODE_TLB:
5276         slave = bond_xmit_tlb_slave_get(bond, skb);
5277         break;
5278     default:
5279         /* Should never happen, mode already checked */
5280         WARN_ONCE(true, "Unknown bonding mode");
5281         break;
5282     }
5283
5284     if (slave)
5285         return slave->dev;
5286     return NULL;
5287 }
5288
5289 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)
5290 {
5291     switch (sk->sk_family) {
5292 #if IS_ENABLED(CONFIG_IPV6)
5293     case AF_INET6:
5294         if (ipv6_only_sock(sk) ||
5295             ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
5296             flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
5297             flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;
5298             flow->addrs.v6addrs.dst = sk->sk_v6_daddr;
5299             break;
5300         }
5301         fallthrough;
5302 #endif
5303     default: /* AF_INET */
5304         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
5305         flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;
5306         flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;
5307         break;
5308     }
5309
5310     flow->ports.src = inet_sk(sk)->inet_sport;
5311     flow->ports.dst = inet_sk(sk)->inet_dport;
5312 }
5313
5314 /**
5315  * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields
5316  * @sk: socket to use for headers
5317  *
5318  * This function will extract the necessary field from the socket and use
5319  * them to generate a hash based on the LAYER34 xmit_policy.
5320  * Assumes that sk is a TCP or UDP socket.
5321  */
5322 static u32 bond_sk_hash_l34(struct sock *sk)
5323 {
5324     struct flow_keys flow;
5325     u32 hash;
5326
5327     bond_sk_to_flow(sk, &flow);
5328
5329     /* L4 */
5330     memcpy(&hash, &flow.ports.ports, sizeof(hash));
5331     /* L3 */
5332     return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34);
5333 }
5334
5335 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,
5336                           struct sock *sk)
5337 {
5338     struct bond_up_slave *slaves;
5339     struct slave *slave;
5340     unsigned int count;
5341     u32 hash;
5342
5343     slaves = rcu_dereference(bond->usable_slaves);
5344     count = slaves ? READ_ONCE(slaves->count) : 0;
5345     if (unlikely(!count))
5346         return NULL;
5347
5348     hash = bond_sk_hash_l34(sk);
5349     slave = slaves->arr[hash % count];
5350
5351     return slave->dev;
5352 }
5353
5354 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
5355                         struct sock *sk)
5356 {
5357     struct bonding *bond = netdev_priv(dev);
5358     struct net_device *lower = NULL;
5359
5360     rcu_read_lock();
5361     if (bond_sk_check(bond))
5362         lower = __bond_sk_get_lower_dev(bond, sk);
5363     rcu_read_unlock();
5364
5365     return lower;
5366 }
5367
5368 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5369 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
5370                     struct net_device *dev)
5371 {
5372     struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev);
5373
5374     /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded
5375      * was true, if tls_device_down is running in parallel, but it's OK,
5376      * because bond_get_slave_by_dev has a NULL check.
5377      */
5378     if (likely(bond_get_slave_by_dev(bond, tls_netdev)))
5379         return bond_dev_queue_xmit(bond, skb, tls_netdev);
5380     return bond_tx_drop(dev, skb);
5381 }
5382 #endif
5383
5384 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5385 {
5386     struct bonding *bond = netdev_priv(dev);
5387
5388     if (bond_should_override_tx_queue(bond) &&
5389         !bond_slave_override(bond, skb))
5390         return NETDEV_TX_OK;
5391
5392 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5393     if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk))
5394         return bond_tls_device_xmit(bond, skb, dev);
5395 #endif
5396
5397     switch (BOND_MODE(bond)) {
5398     case BOND_MODE_ROUNDROBIN:
5399         return bond_xmit_roundrobin(skb, dev);
5400     case BOND_MODE_ACTIVEBACKUP:
5401         return bond_xmit_activebackup(skb, dev);
5402     case BOND_MODE_8023AD:
5403     case BOND_MODE_XOR:
5404         return bond_3ad_xor_xmit(skb, dev);
5405     case BOND_MODE_BROADCAST:
5406         return bond_xmit_broadcast(skb, dev);
5407     case BOND_MODE_ALB:
5408         return bond_alb_xmit(skb, dev);
5409     case BOND_MODE_TLB:
5410         return bond_tlb_xmit(skb, dev);
5411     default:
5412         /* Should never happen, mode already checked */
5413         netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
5414         WARN_ON_ONCE(1);
5415         return bond_tx_drop(dev, skb);
5416     }
5417 }
5418
5419 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5420 {
5421     struct bonding *bond = netdev_priv(dev);
5422     netdev_tx_t ret = NETDEV_TX_OK;
5423
5424     /* If we risk deadlock from transmitting this in the
5425      * netpoll path, tell netpoll to queue the frame for later tx
5426      */
5427     if (unlikely(is_netpoll_tx_blocked(dev)))
5428         return NETDEV_TX_BUSY;
5429
5430     rcu_read_lock();
5431     if (bond_has_slaves(bond))
5432         ret = __bond_start_xmit(skb, dev);
5433     else
5434         ret = bond_tx_drop(dev, skb);
5435     rcu_read_unlock();
5436
5437     return ret;
5438 }
5439
5440 static struct net_device *
5441 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp)
5442 {
5443     struct bonding *bond = netdev_priv(bond_dev);
5444     struct slave *slave;
5445
5446     /* Caller needs to hold rcu_read_lock() */
5447
5448     switch (BOND_MODE(bond)) {
5449     case BOND_MODE_ROUNDROBIN:
5450         slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp);
5451         break;
5452
5453     case BOND_MODE_ACTIVEBACKUP:
5454         slave = bond_xmit_activebackup_slave_get(bond);
5455         break;
5456
5457     case BOND_MODE_8023AD:
5458     case BOND_MODE_XOR:
5459         slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp);
5460         break;
5461
5462     default:
5463         /* Should never happen. Mode guarded by bond_xdp_check() */
5464         netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond));
5465         WARN_ON_ONCE(1);
5466         return NULL;
5467     }
5468
5469     if (slave)
5470         return slave->dev;
5471
5472     return NULL;
5473 }
5474
5475 static int bond_xdp_xmit(struct net_device *bond_dev,
5476              int n, struct xdp_frame **frames, u32 flags)
5477 {
5478     int nxmit, err = -ENXIO;
5479
5480     rcu_read_lock();
5481
5482     for (nxmit = 0; nxmit < n; nxmit++) {
5483         struct xdp_frame *frame = frames[nxmit];
5484         struct xdp_frame *frames1[] = {frame};
5485         struct net_device *slave_dev;
5486         struct xdp_buff xdp;
5487
5488         xdp_convert_frame_to_buff(frame, &xdp);
5489
5490         slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp);
5491         if (!slave_dev) {
5492             err = -ENXIO;
5493             break;
5494         }
5495
5496         err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags);
5497         if (err < 1)
5498             break;
5499     }
5500
5501     rcu_read_unlock();
5502
5503     /* If error happened on the first frame then we can pass the error up, otherwise
5504      * report the number of frames that were xmitted.
5505      */
5506     if (err < 0)
5507         return (nxmit == 0 ? err : nxmit);
5508
5509     return nxmit;
5510 }
5511
5512 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog,
5513             struct netlink_ext_ack *extack)
5514 {
5515     struct bonding *bond = netdev_priv(dev);
5516     struct list_head *iter;
5517     struct slave *slave, *rollback_slave;
5518     struct bpf_prog *old_prog;
5519     struct netdev_bpf xdp = {
5520         .command = XDP_SETUP_PROG,
5521         .flags   = 0,
5522         .prog    = prog,
5523         .extack  = extack,
5524     };
5525     int err;
5526
5527     ASSERT_RTNL();
5528
5529     if (!bond_xdp_check(bond))
5530         return -EOPNOTSUPP;
5531
5532     old_prog = bond->xdp_prog;
5533     bond->xdp_prog = prog;
5534
5535     bond_for_each_slave(bond, slave, iter) {
5536         struct net_device *slave_dev = slave->dev;
5537
5538         if (!slave_dev->netdev_ops->ndo_bpf ||
5539             !slave_dev->netdev_ops->ndo_xdp_xmit) {
5540             SLAVE_NL_ERR(dev, slave_dev, extack,
5541                      "Slave device does not support XDP");
5542             err = -EOPNOTSUPP;
5543             goto err;
5544         }
5545
5546         if (dev_xdp_prog_count(slave_dev) > 0) {
5547             SLAVE_NL_ERR(dev, slave_dev, extack,
5548                      "Slave has XDP program loaded, please unload before enslaving");
5549             err = -EOPNOTSUPP;
5550             goto err;
5551         }
5552
5553         err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5554         if (err < 0) {
5555             /* ndo_bpf() sets extack error message */
5556             slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err);
5557             goto err;
5558         }
5559         if (prog)
5560             bpf_prog_inc(prog);
5561     }
5562
5563     if (prog) {
5564         static_branch_inc(&bpf_master_redirect_enabled_key);
5565     } else if (old_prog) {
5566         bpf_prog_put(old_prog);
5567         static_branch_dec(&bpf_master_redirect_enabled_key);
5568     }
5569
5570     return 0;
5571
5572 err:
5573     /* unwind the program changes */
5574     bond->xdp_prog = old_prog;
5575     xdp.prog = old_prog;
5576     xdp.extack = NULL; /* do not overwrite original error */
5577
5578     bond_for_each_slave(bond, rollback_slave, iter) {
5579         struct net_device *slave_dev = rollback_slave->dev;
5580         int err_unwind;
5581
5582         if (slave == rollback_slave)
5583             break;
5584
5585         err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5586         if (err_unwind < 0)
5587             slave_err(dev, slave_dev,
5588                   "Error %d when unwinding XDP program change\n", err_unwind);
5589         else if (xdp.prog)
5590             bpf_prog_inc(xdp.prog);
5591     }
5592     return err;
5593 }
5594
5595 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp)
5596 {
5597     switch (xdp->command) {
5598     case XDP_SETUP_PROG:
5599         return bond_xdp_set(dev, xdp->prog, xdp->extack);
5600     default:
5601         return -EINVAL;
5602     }
5603 }
5604
5605 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
5606 {
5607     if (speed == 0 || speed == SPEED_UNKNOWN)
5608         speed = slave->speed;
5609     else
5610         speed = min(speed, slave->speed);
5611
5612     return speed;
5613 }
5614
5615 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
5616                        struct ethtool_link_ksettings *cmd)
5617 {
5618     struct bonding *bond = netdev_priv(bond_dev);
5619     struct list_head *iter;
5620     struct slave *slave;
5621     u32 speed = 0;
5622
5623     cmd->base.duplex = DUPLEX_UNKNOWN;
5624     cmd->base.port = PORT_OTHER;
5625
5626     /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
5627      * do not need to check mode.  Though link speed might not represent
5628      * the true receive or transmit bandwidth (not all modes are symmetric)
5629      * this is an accurate maximum.
5630      */
5631     bond_for_each_slave(bond, slave, iter) {
5632         if (bond_slave_can_tx(slave)) {
5633             if (slave->speed != SPEED_UNKNOWN) {
5634                 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
5635                     speed = bond_mode_bcast_speed(slave,
5636                                       speed);
5637                 else
5638                     speed += slave->speed;
5639             }
5640             if (cmd->base.duplex == DUPLEX_UNKNOWN &&
5641                 slave->duplex != DUPLEX_UNKNOWN)
5642                 cmd->base.duplex = slave->duplex;
5643         }
5644     }
5645     cmd->base.speed = speed ? : SPEED_UNKNOWN;
5646
5647     return 0;
5648 }
5649
5650 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
5651                      struct ethtool_drvinfo *drvinfo)
5652 {
5653     strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
5654     snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
5655          BOND_ABI_VERSION);
5656 }
5657
5658 static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
5659                     struct ethtool_ts_info *info)
5660 {
5661     struct bonding *bond = netdev_priv(bond_dev);
5662     const struct ethtool_ops *ops;
5663     struct net_device *real_dev;
5664     struct phy_device *phydev;
5665     int ret = 0;
5666
5667     rcu_read_lock();
5668     real_dev = bond_option_active_slave_get_rcu(bond);
5669     dev_hold(real_dev);
5670     rcu_read_unlock();
5671
5672     if (real_dev) {
5673         ops = real_dev->ethtool_ops;
5674         phydev = real_dev->phydev;
5675
5676         if (phy_has_tsinfo(phydev)) {
5677             ret = phy_ts_info(phydev, info);
5678             goto out;
5679         } else if (ops->get_ts_info) {
5680             ret = ops->get_ts_info(real_dev, info);
5681             goto out;
5682         }
5683     }
5684
5685     info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
5686                 SOF_TIMESTAMPING_SOFTWARE;
5687     info->phc_index = -1;
5688
5689 out:
5690     dev_put(real_dev);
5691     return ret;
5692 }
5693
5694 static const struct ethtool_ops bond_ethtool_ops = {
5695     .get_drvinfo        = bond_ethtool_get_drvinfo,
5696     .get_link       = ethtool_op_get_link,
5697     .get_link_ksettings = bond_ethtool_get_link_ksettings,
5698     .get_ts_info        = bond_ethtool_get_ts_info,
5699 };
5700
5701 static const struct net_device_ops bond_netdev_ops = {
5702     .ndo_init       = bond_init,
5703     .ndo_uninit     = bond_uninit,
5704     .ndo_open       = bond_open,
5705     .ndo_stop       = bond_close,
5706     .ndo_start_xmit     = bond_start_xmit,
5707     .ndo_select_queue   = bond_select_queue,
5708     .ndo_get_stats64    = bond_get_stats,
5709     .ndo_eth_ioctl      = bond_eth_ioctl,
5710     .ndo_siocbond       = bond_do_ioctl,
5711     .ndo_siocdevprivate = bond_siocdevprivate,
5712     .ndo_change_rx_flags    = bond_change_rx_flags,
5713     .ndo_set_rx_mode    = bond_set_rx_mode,
5714     .ndo_change_mtu     = bond_change_mtu,
5715     .ndo_set_mac_address    = bond_set_mac_address,
5716     .ndo_neigh_setup    = bond_neigh_setup,
5717     .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
5718     .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
5719 #ifdef CONFIG_NET_POLL_CONTROLLER
5720     .ndo_netpoll_setup  = bond_netpoll_setup,
5721     .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
5722     .ndo_poll_controller    = bond_poll_controller,
5723 #endif
5724     .ndo_add_slave      = bond_enslave,
5725     .ndo_del_slave      = bond_release,
5726     .ndo_fix_features   = bond_fix_features,
5727     .ndo_features_check = passthru_features_check,
5728     .ndo_get_xmit_slave = bond_xmit_get_slave,
5729     .ndo_sk_get_lower_dev   = bond_sk_get_lower_dev,
5730     .ndo_bpf        = bond_xdp,
5731     .ndo_xdp_xmit           = bond_xdp_xmit,
5732     .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave,
5733 };
5734
5735 static const struct device_type bond_type = {
5736     .name = "bond",
5737 };
5738
5739 static void bond_destructor(struct net_device *bond_dev)
5740 {
5741     struct bonding *bond = netdev_priv(bond_dev);
5742
5743     if (bond->wq)
5744         destroy_workqueue(bond->wq);
5745
5746     if (bond->rr_tx_counter)
5747         free_percpu(bond->rr_tx_counter);
5748 }
5749
5750 void bond_setup(struct net_device *bond_dev)
5751 {
5752     struct bonding *bond = netdev_priv(bond_dev);
5753
5754     spin_lock_init(&bond->mode_lock);
5755     bond->params = bonding_defaults;
5756
5757     /* Initialize pointers */
5758     bond->dev = bond_dev;
5759
5760     /* Initialize the device entry points */
5761     ether_setup(bond_dev);
5762     bond_dev->max_mtu = ETH_MAX_MTU;
5763     bond_dev->netdev_ops = &bond_netdev_ops;
5764     bond_dev->ethtool_ops = &bond_ethtool_ops;
5765
5766     bond_dev->needs_free_netdev = true;
5767     bond_dev->priv_destructor = bond_destructor;
5768
5769     SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
5770
5771     /* Initialize the device options */
5772     bond_dev->flags |= IFF_MASTER;
5773     bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
5774     bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
5775
5776 #ifdef CONFIG_XFRM_OFFLOAD
5777     /* set up xfrm device ops (only supported in active-backup right now) */
5778     bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
5779     INIT_LIST_HEAD(&bond->ipsec_list);
5780     spin_lock_init(&bond->ipsec_lock);
5781 #endif /* CONFIG_XFRM_OFFLOAD */
5782
5783     /* don't acquire bond device's netif_tx_lock when transmitting */
5784     bond_dev->features |= NETIF_F_LLTX;
5785
5786     /* By default, we declare the bond to be fully
5787      * VLAN hardware accelerated capable. Special
5788      * care is taken in the various xmit functions
5789      * when there are slaves that are not hw accel
5790      * capable
5791      */
5792
5793     /* Don't allow bond devices to change network namespaces. */
5794     bond_dev->features |= NETIF_F_NETNS_LOCAL;
5795
5796     bond_dev->hw_features = BOND_VLAN_FEATURES |
5797                 NETIF_F_HW_VLAN_CTAG_RX |
5798                 NETIF_F_HW_VLAN_CTAG_FILTER;
5799
5800     bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
5801     bond_dev->features |= bond_dev->hw_features;
5802     bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
5803 #ifdef CONFIG_XFRM_OFFLOAD
5804     bond_dev->hw_features |= BOND_XFRM_FEATURES;
5805     /* Only enable XFRM features if this is an active-backup config */
5806     if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
5807         bond_dev->features |= BOND_XFRM_FEATURES;
5808 #endif /* CONFIG_XFRM_OFFLOAD */
5809 #if IS_ENABLED(CONFIG_TLS_DEVICE)
5810     if (bond_sk_check(bond))
5811         bond_dev->features |= BOND_TLS_FEATURES;
5812 #endif
5813 }
5814
5815 /* Destroy a bonding device.
5816  * Must be under rtnl_lock when this function is called.
5817  */
5818 static void bond_uninit(struct net_device *bond_dev)
5819 {
5820     struct bonding *bond = netdev_priv(bond_dev);
5821     struct bond_up_slave *usable, *all;
5822     struct list_head *iter;
5823     struct slave *slave;
5824
5825     bond_netpoll_cleanup(bond_dev);
5826
5827     /* Release the bonded slaves */
5828     bond_for_each_slave(bond, slave, iter)
5829         __bond_release_one(bond_dev, slave->dev, true, true);
5830     netdev_info(bond_dev, "Released all slaves\n");
5831
5832     usable = rtnl_dereference(bond->usable_slaves);
5833     if (usable) {
5834         RCU_INIT_POINTER(bond->usable_slaves, NULL);
5835         kfree_rcu(usable, rcu);
5836     }
5837
5838     all = rtnl_dereference(bond->all_slaves);
5839     if (all) {
5840         RCU_INIT_POINTER(bond->all_slaves, NULL);
5841         kfree_rcu(all, rcu);
5842     }
5843
5844     list_del(&bond->bond_list);
5845
5846     bond_debug_unregister(bond);
5847 }
5848
5849 /*------------------------- Module initialization ---------------------------*/
5850
5851 static int bond_check_params(struct bond_params *params)
5852 {
5853     int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
5854     struct bond_opt_value newval;
5855     const struct bond_opt_value *valptr;
5856     int arp_all_targets_value = 0;
5857     u16 ad_actor_sys_prio = 0;
5858     u16 ad_user_port_key = 0;
5859     __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
5860     int arp_ip_count;
5861     int bond_mode   = BOND_MODE_ROUNDROBIN;
5862     int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
5863     int lacp_fast = 0;
5864     int tlb_dynamic_lb;
5865
5866     /* Convert string parameters. */
5867     if (mode) {
5868         bond_opt_initstr(&newval, mode);
5869         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
5870         if (!valptr) {
5871             pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
5872             return -EINVAL;
5873         }
5874         bond_mode = valptr->value;
5875     }
5876
5877     if (xmit_hash_policy) {
5878         if (bond_mode == BOND_MODE_ROUNDROBIN ||
5879             bond_mode == BOND_MODE_ACTIVEBACKUP ||
5880             bond_mode == BOND_MODE_BROADCAST) {
5881             pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
5882                 bond_mode_name(bond_mode));
5883         } else {
5884             bond_opt_initstr(&newval, xmit_hash_policy);
5885             valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
5886                         &newval);
5887             if (!valptr) {
5888                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
5889                        xmit_hash_policy);
5890                 return -EINVAL;
5891             }
5892             xmit_hashtype = valptr->value;
5893         }
5894     }
5895
5896     if (lacp_rate) {
5897         if (bond_mode != BOND_MODE_8023AD) {
5898             pr_info("lacp_rate param is irrelevant in mode %s\n",
5899                 bond_mode_name(bond_mode));
5900         } else {
5901             bond_opt_initstr(&newval, lacp_rate);
5902             valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
5903                         &newval);
5904             if (!valptr) {
5905                 pr_err("Error: Invalid lacp rate \"%s\"\n",
5906                        lacp_rate);
5907                 return -EINVAL;
5908             }
5909             lacp_fast = valptr->value;
5910         }
5911     }
5912
5913     if (ad_select) {
5914         bond_opt_initstr(&newval, ad_select);
5915         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
5916                     &newval);
5917         if (!valptr) {
5918             pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
5919             return -EINVAL;
5920         }
5921         params->ad_select = valptr->value;
5922         if (bond_mode != BOND_MODE_8023AD)
5923             pr_warn("ad_select param only affects 802.3ad mode\n");
5924     } else {
5925         params->ad_select = BOND_AD_STABLE;
5926     }
5927
5928     if (max_bonds < 0) {
5929         pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
5930             max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
5931         max_bonds = BOND_DEFAULT_MAX_BONDS;
5932     }
5933
5934     if (miimon < 0) {
5935         pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5936             miimon, INT_MAX);
5937         miimon = 0;
5938     }
5939
5940     if (updelay < 0) {
5941         pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5942             updelay, INT_MAX);
5943         updelay = 0;
5944     }
5945
5946     if (downdelay < 0) {
5947         pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
5948             downdelay, INT_MAX);
5949         downdelay = 0;
5950     }
5951
5952     if ((use_carrier != 0) && (use_carrier != 1)) {
5953         pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
5954             use_carrier);
5955         use_carrier = 1;
5956     }
5957
5958     if (num_peer_notif < 0 || num_peer_notif > 255) {
5959         pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
5960             num_peer_notif);
5961         num_peer_notif = 1;
5962     }
5963
5964     /* reset values for 802.3ad/TLB/ALB */
5965     if (!bond_mode_uses_arp(bond_mode)) {
5966         if (!miimon) {
5967             pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
5968             pr_warn("Forcing miimon to 100msec\n");
5969             miimon = BOND_DEFAULT_MIIMON;
5970         }
5971     }
5972
5973     if (tx_queues < 1 || tx_queues > 255) {
5974         pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
5975             tx_queues, BOND_DEFAULT_TX_QUEUES);
5976         tx_queues = BOND_DEFAULT_TX_QUEUES;
5977     }
5978
5979     if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
5980         pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
5981             all_slaves_active);
5982         all_slaves_active = 0;
5983     }
5984
5985     if (resend_igmp < 0 || resend_igmp > 255) {
5986         pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
5987             resend_igmp, BOND_DEFAULT_RESEND_IGMP);
5988         resend_igmp = BOND_DEFAULT_RESEND_IGMP;
5989     }
5990
5991     bond_opt_initval(&newval, packets_per_slave);
5992     if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
5993         pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
5994             packets_per_slave, USHRT_MAX);
5995         packets_per_slave = 1;
5996     }
5997
5998     if (bond_mode == BOND_MODE_ALB) {
5999         pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
6000               updelay);
6001     }
6002
6003     if (!miimon) {
6004         if (updelay || downdelay) {
6005             /* just warn the user the up/down delay will have
6006              * no effect since miimon is zero...
6007              */
6008             pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
6009                 updelay, downdelay);
6010         }
6011     } else {
6012         /* don't allow arp monitoring */
6013         if (arp_interval) {
6014             pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
6015                 miimon, arp_interval);
6016             arp_interval = 0;
6017         }
6018
6019         if ((updelay % miimon) != 0) {
6020             pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
6021                 updelay, miimon, (updelay / miimon) * miimon);
6022         }
6023
6024         updelay /= miimon;
6025
6026         if ((downdelay % miimon) != 0) {
6027             pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
6028                 downdelay, miimon,
6029                 (downdelay / miimon) * miimon);
6030         }
6031
6032         downdelay /= miimon;
6033     }
6034
6035     if (arp_interval < 0) {
6036         pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6037             arp_interval, INT_MAX);
6038         arp_interval = 0;
6039     }
6040
6041     for (arp_ip_count = 0, i = 0;
6042          (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
6043         __be32 ip;
6044
6045         /* not a complete check, but good enough to catch mistakes */
6046         if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
6047             !bond_is_ip_target_ok(ip)) {
6048             pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
6049                 arp_ip_target[i]);
6050             arp_interval = 0;
6051         } else {
6052             if (bond_get_targets_ip(arp_target, ip) == -1)
6053                 arp_target[arp_ip_count++] = ip;
6054             else
6055                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
6056                     &ip);
6057         }
6058     }
6059
6060     if (arp_interval && !arp_ip_count) {
6061         /* don't allow arping if no arp_ip_target given... */
6062         pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
6063             arp_interval);
6064         arp_interval = 0;
6065     }
6066
6067     if (arp_validate) {
6068         if (!arp_interval) {
6069             pr_err("arp_validate requires arp_interval\n");
6070             return -EINVAL;
6071         }
6072
6073         bond_opt_initstr(&newval, arp_validate);
6074         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
6075                     &newval);
6076         if (!valptr) {
6077             pr_err("Error: invalid arp_validate \"%s\"\n",
6078                    arp_validate);
6079             return -EINVAL;
6080         }
6081         arp_validate_value = valptr->value;
6082     } else {
6083         arp_validate_value = 0;
6084     }
6085
6086     if (arp_all_targets) {
6087         bond_opt_initstr(&newval, arp_all_targets);
6088         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
6089                     &newval);
6090         if (!valptr) {
6091             pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
6092                    arp_all_targets);
6093             arp_all_targets_value = 0;
6094         } else {
6095             arp_all_targets_value = valptr->value;
6096         }
6097     }
6098
6099     if (miimon) {
6100         pr_info("MII link monitoring set to %d ms\n", miimon);
6101     } else if (arp_interval) {
6102         valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
6103                       arp_validate_value);
6104         pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
6105             arp_interval, valptr->string, arp_ip_count);
6106
6107         for (i = 0; i < arp_ip_count; i++)
6108             pr_cont(" %s", arp_ip_target[i]);
6109
6110         pr_cont("\n");
6111
6112     } else if (max_bonds) {
6113         /* miimon and arp_interval not set, we need one so things
6114          * work as expected, see bonding.txt for details
6115          */
6116         pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
6117     }
6118
6119     if (primary && !bond_mode_uses_primary(bond_mode)) {
6120         /* currently, using a primary only makes sense
6121          * in active backup, TLB or ALB modes
6122          */
6123         pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
6124             primary, bond_mode_name(bond_mode));
6125         primary = NULL;
6126     }
6127
6128     if (primary && primary_reselect) {
6129         bond_opt_initstr(&newval, primary_reselect);
6130         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
6131                     &newval);
6132         if (!valptr) {
6133             pr_err("Error: Invalid primary_reselect \"%s\"\n",
6134                    primary_reselect);
6135             return -EINVAL;
6136         }
6137         primary_reselect_value = valptr->value;
6138     } else {
6139         primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
6140     }
6141
6142     if (fail_over_mac) {
6143         bond_opt_initstr(&newval, fail_over_mac);
6144         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
6145                     &newval);
6146         if (!valptr) {
6147             pr_err("Error: invalid fail_over_mac \"%s\"\n",
6148                    fail_over_mac);
6149             return -EINVAL;
6150         }
6151         fail_over_mac_value = valptr->value;
6152         if (bond_mode != BOND_MODE_ACTIVEBACKUP)
6153             pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
6154     } else {
6155         fail_over_mac_value = BOND_FOM_NONE;
6156     }
6157
6158     bond_opt_initstr(&newval, "default");
6159     valptr = bond_opt_parse(
6160             bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
6161                      &newval);
6162     if (!valptr) {
6163         pr_err("Error: No ad_actor_sys_prio default value");
6164         return -EINVAL;
6165     }
6166     ad_actor_sys_prio = valptr->value;
6167
6168     valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
6169                 &newval);
6170     if (!valptr) {
6171         pr_err("Error: No ad_user_port_key default value");
6172         return -EINVAL;
6173     }
6174     ad_user_port_key = valptr->value;
6175
6176     bond_opt_initstr(&newval, "default");
6177     valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
6178     if (!valptr) {
6179         pr_err("Error: No tlb_dynamic_lb default value");
6180         return -EINVAL;
6181     }
6182     tlb_dynamic_lb = valptr->value;
6183
6184     if (lp_interval == 0) {
6185         pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
6186             INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
6187         lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
6188     }
6189
6190     /* fill params struct with the proper values */
6191     params->mode = bond_mode;
6192     params->xmit_policy = xmit_hashtype;
6193     params->miimon = miimon;
6194     params->num_peer_notif = num_peer_notif;
6195     params->arp_interval = arp_interval;
6196     params->arp_validate = arp_validate_value;
6197     params->arp_all_targets = arp_all_targets_value;
6198     params->missed_max = 2;
6199     params->updelay = updelay;
6200     params->downdelay = downdelay;
6201     params->peer_notif_delay = 0;
6202     params->use_carrier = use_carrier;
6203     params->lacp_active = 1;
6204     params->lacp_fast = lacp_fast;
6205     params->primary[0] = 0;
6206     params->primary_reselect = primary_reselect_value;
6207     params->fail_over_mac = fail_over_mac_value;
6208     params->tx_queues = tx_queues;
6209     params->all_slaves_active = all_slaves_active;
6210     params->resend_igmp = resend_igmp;
6211     params->min_links = min_links;
6212     params->lp_interval = lp_interval;
6213     params->packets_per_slave = packets_per_slave;
6214     params->tlb_dynamic_lb = tlb_dynamic_lb;
6215     params->ad_actor_sys_prio = ad_actor_sys_prio;
6216     eth_zero_addr(params->ad_actor_system);
6217     params->ad_user_port_key = ad_user_port_key;
6218     if (packets_per_slave > 0) {
6219         params->reciprocal_packets_per_slave =
6220             reciprocal_value(packets_per_slave);
6221     } else {
6222         /* reciprocal_packets_per_slave is unused if
6223          * packets_per_slave is 0 or 1, just initialize it
6224          */
6225         params->reciprocal_packets_per_slave =
6226             (struct reciprocal_value) { 0 };
6227     }
6228
6229     if (primary)
6230         strscpy_pad(params->primary, primary, sizeof(params->primary));
6231
6232     memcpy(params->arp_targets, arp_target, sizeof(arp_target));
6233 #if IS_ENABLED(CONFIG_IPV6)
6234     memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS);
6235 #endif
6236
6237     return 0;
6238 }
6239
6240 /* Called from registration process */
6241 static int bond_init(struct net_device *bond_dev)
6242 {
6243     struct bonding *bond = netdev_priv(bond_dev);
6244     struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
6245
6246     netdev_dbg(bond_dev, "Begin bond_init\n");
6247
6248     bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
6249     if (!bond->wq)
6250         return -ENOMEM;
6251
6252     spin_lock_init(&bond->stats_lock);
6253     netdev_lockdep_set_classes(bond_dev);
6254
6255     list_add_tail(&bond->bond_list, &bn->dev_list);
6256
6257     bond_prepare_sysfs_group(bond);
6258
6259     bond_debug_register(bond);
6260
6261     /* Ensure valid dev_addr */
6262     if (is_zero_ether_addr(bond_dev->dev_addr) &&
6263         bond_dev->addr_assign_type == NET_ADDR_PERM)
6264         eth_hw_addr_random(bond_dev);
6265
6266     return 0;
6267 }
6268
6269 unsigned int bond_get_num_tx_queues(void)
6270 {
6271     return tx_queues;
6272 }
6273
6274 /* Create a new bond based on the specified name and bonding parameters.
6275  * If name is NULL, obtain a suitable "bond%d" name for us.
6276  * Caller must NOT hold rtnl_lock; we need to release it here before we
6277  * set up our sysfs entries.
6278  */
6279 int bond_create(struct net *net, const char *name)
6280 {
6281     struct net_device *bond_dev;
6282     struct bonding *bond;
6283     int res = -ENOMEM;
6284
6285     rtnl_lock();
6286
6287     bond_dev = alloc_netdev_mq(sizeof(struct bonding),
6288                    name ? name : "bond%d", NET_NAME_UNKNOWN,
6289                    bond_setup, tx_queues);
6290     if (!bond_dev)
6291         goto out;
6292
6293     bond = netdev_priv(bond_dev);
6294     dev_net_set(bond_dev, net);
6295     bond_dev->rtnl_link_ops = &bond_link_ops;
6296
6297     res = register_netdevice(bond_dev);
6298     if (res < 0) {
6299         free_netdev(bond_dev);
6300         goto out;
6301     }
6302
6303     netif_carrier_off(bond_dev);
6304
6305     bond_work_init_all(bond);
6306
6307 out:
6308     rtnl_unlock();
6309     return res;
6310 }
6311
6312 static int __net_init bond_net_init(struct net *net)
6313 {
6314     struct bond_net *bn = net_generic(net, bond_net_id);
6315
6316     bn->net = net;
6317     INIT_LIST_HEAD(&bn->dev_list);
6318
6319     bond_create_proc_dir(bn);
6320     bond_create_sysfs(bn);
6321
6322     return 0;
6323 }
6324
6325 static void __net_exit bond_net_exit_batch(struct list_head *net_list)
6326 {
6327     struct bond_net *bn;
6328     struct net *net;
6329     LIST_HEAD(list);
6330
6331     list_for_each_entry(net, net_list, exit_list) {
6332         bn = net_generic(net, bond_net_id);
6333         bond_destroy_sysfs(bn);
6334     }
6335
6336     /* Kill off any bonds created after unregistering bond rtnl ops */
6337     rtnl_lock();
6338     list_for_each_entry(net, net_list, exit_list) {
6339         struct bonding *bond, *tmp_bond;
6340
6341         bn = net_generic(net, bond_net_id);
6342         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
6343             unregister_netdevice_queue(bond->dev, &list);
6344     }
6345     unregister_netdevice_many(&list);
6346     rtnl_unlock();
6347
6348     list_for_each_entry(net, net_list, exit_list) {
6349         bn = net_generic(net, bond_net_id);
6350         bond_destroy_proc_dir(bn);
6351     }
6352 }
6353
6354 static struct pernet_operations bond_net_ops = {
6355     .init = bond_net_init,
6356     .exit_batch = bond_net_exit_batch,
6357     .id   = &bond_net_id,
6358     .size = sizeof(struct bond_net),
6359 };
6360
6361 static int __init bonding_init(void)
6362 {
6363     int i;
6364     int res;
6365
6366     res = bond_check_params(&bonding_defaults);
6367     if (res)
6368         goto out;
6369
6370     res = register_pernet_subsys(&bond_net_ops);
6371     if (res)
6372         goto out;
6373
6374     res = bond_netlink_init();
6375     if (res)
6376         goto err_link;
6377
6378     bond_create_debugfs();
6379
6380     for (i = 0; i < max_bonds; i++) {
6381         res = bond_create(&init_net, NULL);
6382         if (res)
6383             goto err;
6384     }
6385
6386     skb_flow_dissector_init(&flow_keys_bonding,
6387                 flow_keys_bonding_keys,
6388                 ARRAY_SIZE(flow_keys_bonding_keys));
6389
6390     register_netdevice_notifier(&bond_netdev_notifier);
6391 out:
6392     return res;
6393 err:
6394     bond_destroy_debugfs();
6395     bond_netlink_fini();
6396 err_link:
6397     unregister_pernet_subsys(&bond_net_ops);
6398     goto out;
6399
6400 }
6401
6402 static void __exit bonding_exit(void)
6403 {
6404     unregister_netdevice_notifier(&bond_netdev_notifier);
6405
6406     bond_destroy_debugfs();
6407
6408     bond_netlink_fini();
6409     unregister_pernet_subsys(&bond_net_ops);
6410
6411 #ifdef CONFIG_NET_POLL_CONTROLLER
6412     /* Make sure we don't have an imbalance on our netpoll blocking */
6413     WARN_ON(atomic_read(&netpoll_block_tx));
6414 #endif
6415 }
6416
6417 module_init(bonding_init);
6418 module_exit(bonding_exit);
6419 MODULE_LICENSE("GPL");
6420 MODULE_DESCRIPTION(DRV_DESCRIPTION);
6421 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");