net/atm/lec.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * lec.c: Lan Emulation driver
0004  *
0005  * Marko Kiiskila <mkiiskila@yahoo.com>
0006  */
0007
0008 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
0009
0010 #include <linux/slab.h>
0011 #include <linux/kernel.h>
0012 #include <linux/bitops.h>
0013 #include <linux/capability.h>
0014
0015 /* We are ethernet device */
0016 #include <linux/if_ether.h>
0017 #include <linux/netdevice.h>
0018 #include <linux/etherdevice.h>
0019 #include <net/sock.h>
0020 #include <linux/skbuff.h>
0021 #include <linux/ip.h>
0022 #include <asm/byteorder.h>
0023 #include <linux/uaccess.h>
0024 #include <net/arp.h>
0025 #include <net/dst.h>
0026 #include <linux/proc_fs.h>
0027 #include <linux/spinlock.h>
0028 #include <linux/seq_file.h>
0029
0030 /* And atm device */
0031 #include <linux/atmdev.h>
0032 #include <linux/atmlec.h>
0033
0034 /* Proxy LEC knows about bridging */
0035 #if IS_ENABLED(CONFIG_BRIDGE)
0036 #include "../bridge/br_private.h"
0037
0038 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
0039 #endif
0040
0041 /* Modular too */
0042 #include <linux/module.h>
0043 #include <linux/init.h>
0044
0045 /* Hardening for Spectre-v1 */
0046 #include <linux/nospec.h>
0047
0048 #include "lec.h"
0049 #include "lec_arpc.h"
0050 #include "resources.h"
0051
0052 #define DUMP_PACKETS 0      /*
0053                  * 0 = None,
0054                  * 1 = 30 first bytes
0055                  * 2 = Whole packet
0056                  */
0057
0058 #define LEC_UNRES_QUE_LEN 8 /*
0059                  * number of tx packets to queue for a
0060                  * single destination while waiting for SVC
0061                  */
0062
0063 static int lec_open(struct net_device *dev);
0064 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
0065                   struct net_device *dev);
0066 static int lec_close(struct net_device *dev);
0067 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
0068                       const unsigned char *mac_addr);
0069 static int lec_arp_remove(struct lec_priv *priv,
0070               struct lec_arp_table *to_remove);
0071 /* LANE2 functions */
0072 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
0073                 const u8 *tlvs, u32 sizeoftlvs);
0074 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
0075              u8 **tlvs, u32 *sizeoftlvs);
0076 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
0077                    const u8 *tlvs, u32 sizeoftlvs);
0078
0079 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
0080                unsigned long permanent);
0081 static void lec_arp_check_empties(struct lec_priv *priv,
0082                   struct atm_vcc *vcc, struct sk_buff *skb);
0083 static void lec_arp_destroy(struct lec_priv *priv);
0084 static void lec_arp_init(struct lec_priv *priv);
0085 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
0086                        const unsigned char *mac_to_find,
0087                        int is_rdesc,
0088                        struct lec_arp_table **ret_entry);
0089 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
0090                const unsigned char *atm_addr,
0091                unsigned long remoteflag,
0092                unsigned int targetless_le_arp);
0093 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
0094 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
0095 static void lec_set_flush_tran_id(struct lec_priv *priv,
0096                   const unsigned char *atm_addr,
0097                   unsigned long tran_id);
0098 static void lec_vcc_added(struct lec_priv *priv,
0099               const struct atmlec_ioc *ioc_data,
0100               struct atm_vcc *vcc,
0101               void (*old_push)(struct atm_vcc *vcc,
0102                        struct sk_buff *skb));
0103 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
0104
0105 /* must be done under lec_arp_lock */
0106 static inline void lec_arp_hold(struct lec_arp_table *entry)
0107 {
0108     refcount_inc(&entry->usage);
0109 }
0110
0111 static inline void lec_arp_put(struct lec_arp_table *entry)
0112 {
0113     if (refcount_dec_and_test(&entry->usage))
0114         kfree(entry);
0115 }
0116
0117 static struct lane2_ops lane2_ops = {
0118     .resolve = lane2_resolve,       /* spec 3.1.3 */
0119     .associate_req = lane2_associate_req,   /* spec 3.1.4 */
0120     .associate_indicator = NULL             /* spec 3.1.5 */
0121 };
0122
0123 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
0124
0125 /* Device structures */
0126 static struct net_device *dev_lec[MAX_LEC_ITF];
0127
0128 #if IS_ENABLED(CONFIG_BRIDGE)
0129 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
0130 {
0131     char *buff;
0132     struct lec_priv *priv;
0133
0134     /*
0135      * Check if this is a BPDU. If so, ask zeppelin to send
0136      * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
0137      * as the Config BPDU has
0138      */
0139     buff = skb->data + skb->dev->hard_header_len;
0140     if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
0141         struct sock *sk;
0142         struct sk_buff *skb2;
0143         struct atmlec_msg *mesg;
0144
0145         skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
0146         if (skb2 == NULL)
0147             return;
0148         skb2->len = sizeof(struct atmlec_msg);
0149         mesg = (struct atmlec_msg *)skb2->data;
0150         mesg->type = l_topology_change;
0151         buff += 4;
0152         mesg->content.normal.flag = *buff & 0x01;
0153                     /* 0x01 is topology change */
0154
0155         priv = netdev_priv(dev);
0156         atm_force_charge(priv->lecd, skb2->truesize);
0157         sk = sk_atm(priv->lecd);
0158         skb_queue_tail(&sk->sk_receive_queue, skb2);
0159         sk->sk_data_ready(sk);
0160     }
0161 }
0162 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
0163
0164 /*
0165  * Open/initialize the netdevice. This is called (in the current kernel)
0166  * sometime after booting when the 'ifconfig' program is run.
0167  *
0168  * This routine should set everything up anew at each open, even
0169  * registers that "should" only need to be set once at boot, so that
0170  * there is non-reboot way to recover if something goes wrong.
0171  */
0172
0173 static int lec_open(struct net_device *dev)
0174 {
0175     netif_start_queue(dev);
0176
0177     return 0;
0178 }
0179
0180 static void
0181 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
0182 {
0183     struct net_device *dev = skb->dev;
0184
0185     ATM_SKB(skb)->vcc = vcc;
0186     atm_account_tx(vcc, skb);
0187
0188     if (vcc->send(vcc, skb) < 0) {
0189         dev->stats.tx_dropped++;
0190         return;
0191     }
0192
0193     dev->stats.tx_packets++;
0194     dev->stats.tx_bytes += skb->len;
0195 }
0196
0197 static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue)
0198 {
0199     pr_info("%s\n", dev->name);
0200     netif_trans_update(dev);
0201     netif_wake_queue(dev);
0202 }
0203
0204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
0205                   struct net_device *dev)
0206 {
0207     struct sk_buff *skb2;
0208     struct lec_priv *priv = netdev_priv(dev);
0209     struct lecdatahdr_8023 *lec_h;
0210     struct atm_vcc *vcc;
0211     struct lec_arp_table *entry;
0212     unsigned char *dst;
0213     int min_frame_size;
0214     int is_rdesc;
0215
0216     pr_debug("called\n");
0217     if (!priv->lecd) {
0218         pr_info("%s:No lecd attached\n", dev->name);
0219         dev->stats.tx_errors++;
0220         netif_stop_queue(dev);
0221         kfree_skb(skb);
0222         return NETDEV_TX_OK;
0223     }
0224
0225     pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
0226          (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
0227          (long)skb_end_pointer(skb));
0228 #if IS_ENABLED(CONFIG_BRIDGE)
0229     if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
0230         lec_handle_bridge(skb, dev);
0231 #endif
0232
0233     /* Make sure we have room for lec_id */
0234     if (skb_headroom(skb) < 2) {
0235         pr_debug("reallocating skb\n");
0236         skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
0237         if (unlikely(!skb2)) {
0238             kfree_skb(skb);
0239             return NETDEV_TX_OK;
0240         }
0241         consume_skb(skb);
0242         skb = skb2;
0243     }
0244     skb_push(skb, 2);
0245
0246     /* Put le header to place */
0247     lec_h = (struct lecdatahdr_8023 *)skb->data;
0248     lec_h->le_header = htons(priv->lecid);
0249
0250 #if DUMP_PACKETS >= 2
0251 #define MAX_DUMP_SKB 99
0252 #elif DUMP_PACKETS >= 1
0253 #define MAX_DUMP_SKB 30
0254 #endif
0255 #if DUMP_PACKETS >= 1
0256     printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
0257            dev->name, skb->len, priv->lecid);
0258     print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
0259                skb->data, min(skb->len, MAX_DUMP_SKB), true);
0260 #endif /* DUMP_PACKETS >= 1 */
0261
0262     /* Minimum ethernet-frame size */
0263     min_frame_size = LEC_MINIMUM_8023_SIZE;
0264     if (skb->len < min_frame_size) {
0265         if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
0266             skb2 = skb_copy_expand(skb, 0,
0267                            min_frame_size - skb->truesize,
0268                            GFP_ATOMIC);
0269             dev_kfree_skb(skb);
0270             if (skb2 == NULL) {
0271                 dev->stats.tx_dropped++;
0272                 return NETDEV_TX_OK;
0273             }
0274             skb = skb2;
0275         }
0276         skb_put(skb, min_frame_size - skb->len);
0277     }
0278
0279     /* Send to right vcc */
0280     is_rdesc = 0;
0281     dst = lec_h->h_dest;
0282     entry = NULL;
0283     vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
0284     pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
0285          dev->name, vcc, vcc ? vcc->flags : 0, entry);
0286     if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
0287         if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
0288             pr_debug("%s:queuing packet, MAC address %pM\n",
0289                  dev->name, lec_h->h_dest);
0290             skb_queue_tail(&entry->tx_wait, skb);
0291         } else {
0292             pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
0293                  dev->name, lec_h->h_dest);
0294             dev->stats.tx_dropped++;
0295             dev_kfree_skb(skb);
0296         }
0297         goto out;
0298     }
0299 #if DUMP_PACKETS > 0
0300     printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
0301            dev->name, vcc->vpi, vcc->vci);
0302 #endif /* DUMP_PACKETS > 0 */
0303
0304     while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
0305         pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
0306         lec_send(vcc, skb2);
0307     }
0308
0309     lec_send(vcc, skb);
0310
0311     if (!atm_may_send(vcc, 0)) {
0312         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
0313
0314         vpriv->xoff = 1;
0315         netif_stop_queue(dev);
0316
0317         /*
0318          * vcc->pop() might have occurred in between, making
0319          * the vcc usuable again.  Since xmit is serialized,
0320          * this is the only situation we have to re-test.
0321          */
0322
0323         if (atm_may_send(vcc, 0))
0324             netif_wake_queue(dev);
0325     }
0326
0327 out:
0328     if (entry)
0329         lec_arp_put(entry);
0330     netif_trans_update(dev);
0331     return NETDEV_TX_OK;
0332 }
0333
0334 /* The inverse routine to net_open(). */
0335 static int lec_close(struct net_device *dev)
0336 {
0337     netif_stop_queue(dev);
0338     return 0;
0339 }
0340
0341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
0342 {
0343     static const u8 zero_addr[ETH_ALEN] = {};
0344     unsigned long flags;
0345     struct net_device *dev = (struct net_device *)vcc->proto_data;
0346     struct lec_priv *priv = netdev_priv(dev);
0347     struct atmlec_msg *mesg;
0348     struct lec_arp_table *entry;
0349     char *tmp;      /* FIXME */
0350
0351     WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
0352     mesg = (struct atmlec_msg *)skb->data;
0353     tmp = skb->data;
0354     tmp += sizeof(struct atmlec_msg);
0355     pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
0356     switch (mesg->type) {
0357     case l_set_mac_addr:
0358         eth_hw_addr_set(dev, mesg->content.normal.mac_addr);
0359         break;
0360     case l_del_mac_addr:
0361         eth_hw_addr_set(dev, zero_addr);
0362         break;
0363     case l_addr_delete:
0364         lec_addr_delete(priv, mesg->content.normal.atm_addr,
0365                 mesg->content.normal.flag);
0366         break;
0367     case l_topology_change:
0368         priv->topology_change = mesg->content.normal.flag;
0369         break;
0370     case l_flush_complete:
0371         lec_flush_complete(priv, mesg->content.normal.flag);
0372         break;
0373     case l_narp_req:    /* LANE2: see 7.1.35 in the lane2 spec */
0374         spin_lock_irqsave(&priv->lec_arp_lock, flags);
0375         entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
0376         lec_arp_remove(priv, entry);
0377         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
0378
0379         if (mesg->content.normal.no_source_le_narp)
0380             break;
0381         fallthrough;
0382     case l_arp_update:
0383         lec_arp_update(priv, mesg->content.normal.mac_addr,
0384                    mesg->content.normal.atm_addr,
0385                    mesg->content.normal.flag,
0386                    mesg->content.normal.targetless_le_arp);
0387         pr_debug("in l_arp_update\n");
0388         if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
0389             pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
0390                  mesg->sizeoftlvs);
0391             lane2_associate_ind(dev, mesg->content.normal.mac_addr,
0392                         tmp, mesg->sizeoftlvs);
0393         }
0394         break;
0395     case l_config:
0396         priv->maximum_unknown_frame_count =
0397             mesg->content.config.maximum_unknown_frame_count;
0398         priv->max_unknown_frame_time =
0399             (mesg->content.config.max_unknown_frame_time * HZ);
0400         priv->max_retry_count = mesg->content.config.max_retry_count;
0401         priv->aging_time = (mesg->content.config.aging_time * HZ);
0402         priv->forward_delay_time =
0403             (mesg->content.config.forward_delay_time * HZ);
0404         priv->arp_response_time =
0405             (mesg->content.config.arp_response_time * HZ);
0406         priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
0407         priv->path_switching_delay =
0408             (mesg->content.config.path_switching_delay * HZ);
0409         priv->lane_version = mesg->content.config.lane_version;
0410                     /* LANE2 */
0411         priv->lane2_ops = NULL;
0412         if (priv->lane_version > 1)
0413             priv->lane2_ops = &lane2_ops;
0414         rtnl_lock();
0415         if (dev_set_mtu(dev, mesg->content.config.mtu))
0416             pr_info("%s: change_mtu to %d failed\n",
0417                 dev->name, mesg->content.config.mtu);
0418         rtnl_unlock();
0419         priv->is_proxy = mesg->content.config.is_proxy;
0420         break;
0421     case l_flush_tran_id:
0422         lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
0423                       mesg->content.normal.flag);
0424         break;
0425     case l_set_lecid:
0426         priv->lecid =
0427             (unsigned short)(0xffff & mesg->content.normal.flag);
0428         break;
0429     case l_should_bridge:
0430 #if IS_ENABLED(CONFIG_BRIDGE)
0431     {
0432         pr_debug("%s: bridge zeppelin asks about %pM\n",
0433              dev->name, mesg->content.proxy.mac_addr);
0434
0435         if (br_fdb_test_addr_hook == NULL)
0436             break;
0437
0438         if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
0439             /* hit from bridge table, send LE_ARP_RESPONSE */
0440             struct sk_buff *skb2;
0441             struct sock *sk;
0442
0443             pr_debug("%s: entry found, responding to zeppelin\n",
0444                  dev->name);
0445             skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
0446             if (skb2 == NULL)
0447                 break;
0448             skb2->len = sizeof(struct atmlec_msg);
0449             skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
0450             atm_force_charge(priv->lecd, skb2->truesize);
0451             sk = sk_atm(priv->lecd);
0452             skb_queue_tail(&sk->sk_receive_queue, skb2);
0453             sk->sk_data_ready(sk);
0454         }
0455     }
0456 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
0457         break;
0458     default:
0459         pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
0460         dev_kfree_skb(skb);
0461         return -EINVAL;
0462     }
0463     dev_kfree_skb(skb);
0464     return 0;
0465 }
0466
0467 static void lec_atm_close(struct atm_vcc *vcc)
0468 {
0469     struct sk_buff *skb;
0470     struct net_device *dev = (struct net_device *)vcc->proto_data;
0471     struct lec_priv *priv = netdev_priv(dev);
0472
0473     priv->lecd = NULL;
0474     /* Do something needful? */
0475
0476     netif_stop_queue(dev);
0477     lec_arp_destroy(priv);
0478
0479     if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
0480         pr_info("%s closing with messages pending\n", dev->name);
0481     while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
0482         atm_return(vcc, skb->truesize);
0483         dev_kfree_skb(skb);
0484     }
0485
0486     pr_info("%s: Shut down!\n", dev->name);
0487     module_put(THIS_MODULE);
0488 }
0489
0490 static const struct atmdev_ops lecdev_ops = {
0491     .close = lec_atm_close,
0492     .send = lec_atm_send
0493 };
0494
0495 static struct atm_dev lecatm_dev = {
0496     .ops = &lecdev_ops,
0497     .type = "lec",
0498     .number = 999,      /* dummy device number */
0499     .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
0500 };
0501
0502 /*
0503  * LANE2: new argument struct sk_buff *data contains
0504  * the LE_ARP based TLVs introduced in the LANE2 spec
0505  */
0506 static int
0507 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
0508          const unsigned char *mac_addr, const unsigned char *atm_addr,
0509          struct sk_buff *data)
0510 {
0511     struct sock *sk;
0512     struct sk_buff *skb;
0513     struct atmlec_msg *mesg;
0514
0515     if (!priv || !priv->lecd)
0516         return -1;
0517     skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
0518     if (!skb)
0519         return -1;
0520     skb->len = sizeof(struct atmlec_msg);
0521     mesg = (struct atmlec_msg *)skb->data;
0522     memset(mesg, 0, sizeof(struct atmlec_msg));
0523     mesg->type = type;
0524     if (data != NULL)
0525         mesg->sizeoftlvs = data->len;
0526     if (mac_addr)
0527         ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
0528     else
0529         mesg->content.normal.targetless_le_arp = 1;
0530     if (atm_addr)
0531         memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
0532
0533     atm_force_charge(priv->lecd, skb->truesize);
0534     sk = sk_atm(priv->lecd);
0535     skb_queue_tail(&sk->sk_receive_queue, skb);
0536     sk->sk_data_ready(sk);
0537
0538     if (data != NULL) {
0539         pr_debug("about to send %d bytes of data\n", data->len);
0540         atm_force_charge(priv->lecd, data->truesize);
0541         skb_queue_tail(&sk->sk_receive_queue, data);
0542         sk->sk_data_ready(sk);
0543     }
0544
0545     return 0;
0546 }
0547
0548 static void lec_set_multicast_list(struct net_device *dev)
0549 {
0550     /*
0551      * by default, all multicast frames arrive over the bus.
0552      * eventually support selective multicast service
0553      */
0554 }
0555
0556 static const struct net_device_ops lec_netdev_ops = {
0557     .ndo_open       = lec_open,
0558     .ndo_stop       = lec_close,
0559     .ndo_start_xmit     = lec_start_xmit,
0560     .ndo_tx_timeout     = lec_tx_timeout,
0561     .ndo_set_rx_mode    = lec_set_multicast_list,
0562 };
0563
0564 static const unsigned char lec_ctrl_magic[] = {
0565     0xff,
0566     0x00,
0567     0x01,
0568     0x01
0569 };
0570
0571 #define LEC_DATA_DIRECT_8023  2
0572 #define LEC_DATA_DIRECT_8025  3
0573
0574 static int lec_is_data_direct(struct atm_vcc *vcc)
0575 {
0576     return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
0577         (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
0578 }
0579
0580 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
0581 {
0582     unsigned long flags;
0583     struct net_device *dev = (struct net_device *)vcc->proto_data;
0584     struct lec_priv *priv = netdev_priv(dev);
0585
0586 #if DUMP_PACKETS > 0
0587     printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
0588            dev->name, vcc->vpi, vcc->vci);
0589 #endif
0590     if (!skb) {
0591         pr_debug("%s: null skb\n", dev->name);
0592         lec_vcc_close(priv, vcc);
0593         return;
0594     }
0595 #if DUMP_PACKETS >= 2
0596 #define MAX_SKB_DUMP 99
0597 #elif DUMP_PACKETS >= 1
0598 #define MAX_SKB_DUMP 30
0599 #endif
0600 #if DUMP_PACKETS > 0
0601     printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
0602            dev->name, skb->len, priv->lecid);
0603     print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
0604                skb->data, min(MAX_SKB_DUMP, skb->len), true);
0605 #endif /* DUMP_PACKETS > 0 */
0606     if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
0607                 /* Control frame, to daemon */
0608         struct sock *sk = sk_atm(vcc);
0609
0610         pr_debug("%s: To daemon\n", dev->name);
0611         skb_queue_tail(&sk->sk_receive_queue, skb);
0612         sk->sk_data_ready(sk);
0613     } else {        /* Data frame, queue to protocol handlers */
0614         struct lec_arp_table *entry;
0615         unsigned char *src, *dst;
0616
0617         atm_return(vcc, skb->truesize);
0618         if (*(__be16 *) skb->data == htons(priv->lecid) ||
0619             !priv->lecd || !(dev->flags & IFF_UP)) {
0620             /*
0621              * Probably looping back, or if lecd is missing,
0622              * lecd has gone down
0623              */
0624             pr_debug("Ignoring frame...\n");
0625             dev_kfree_skb(skb);
0626             return;
0627         }
0628         dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
0629
0630         /*
0631          * If this is a Data Direct VCC, and the VCC does not match
0632          * the LE_ARP cache entry, delete the LE_ARP cache entry.
0633          */
0634         spin_lock_irqsave(&priv->lec_arp_lock, flags);
0635         if (lec_is_data_direct(vcc)) {
0636             src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
0637             entry = lec_arp_find(priv, src);
0638             if (entry && entry->vcc != vcc) {
0639                 lec_arp_remove(priv, entry);
0640                 lec_arp_put(entry);
0641             }
0642         }
0643         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
0644
0645         if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
0646             !priv->is_proxy &&  /* Proxy wants all the packets */
0647             memcmp(dst, dev->dev_addr, dev->addr_len)) {
0648             dev_kfree_skb(skb);
0649             return;
0650         }
0651         if (!hlist_empty(&priv->lec_arp_empty_ones))
0652             lec_arp_check_empties(priv, vcc, skb);
0653         skb_pull(skb, 2);   /* skip lec_id */
0654         skb->protocol = eth_type_trans(skb, dev);
0655         dev->stats.rx_packets++;
0656         dev->stats.rx_bytes += skb->len;
0657         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
0658         netif_rx(skb);
0659     }
0660 }
0661
0662 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
0663 {
0664     struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
0665     struct net_device *dev = skb->dev;
0666
0667     if (vpriv == NULL) {
0668         pr_info("vpriv = NULL!?!?!?\n");
0669         return;
0670     }
0671
0672     vpriv->old_pop(vcc, skb);
0673
0674     if (vpriv->xoff && atm_may_send(vcc, 0)) {
0675         vpriv->xoff = 0;
0676         if (netif_running(dev) && netif_queue_stopped(dev))
0677             netif_wake_queue(dev);
0678     }
0679 }
0680
0681 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
0682 {
0683     struct lec_vcc_priv *vpriv;
0684     int bytes_left;
0685     struct atmlec_ioc ioc_data;
0686
0687     /* Lecd must be up in this case */
0688     bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
0689     if (bytes_left != 0)
0690         pr_info("copy from user failed for %d bytes\n", bytes_left);
0691     if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
0692         return -EINVAL;
0693     ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
0694     if (!dev_lec[ioc_data.dev_num])
0695         return -EINVAL;
0696     vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
0697     if (!vpriv)
0698         return -ENOMEM;
0699     vpriv->xoff = 0;
0700     vpriv->old_pop = vcc->pop;
0701     vcc->user_back = vpriv;
0702     vcc->pop = lec_pop;
0703     lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
0704               &ioc_data, vcc, vcc->push);
0705     vcc->proto_data = dev_lec[ioc_data.dev_num];
0706     vcc->push = lec_push;
0707     return 0;
0708 }
0709
0710 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
0711 {
0712     if (arg < 0 || arg >= MAX_LEC_ITF)
0713         return -EINVAL;
0714     arg = array_index_nospec(arg, MAX_LEC_ITF);
0715     if (!dev_lec[arg])
0716         return -EINVAL;
0717     vcc->proto_data = dev_lec[arg];
0718     return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
0719 }
0720
0721 /* Initialize device. */
0722 static int lecd_attach(struct atm_vcc *vcc, int arg)
0723 {
0724     int i;
0725     struct lec_priv *priv;
0726
0727     if (arg < 0)
0728         arg = 0;
0729     if (arg >= MAX_LEC_ITF)
0730         return -EINVAL;
0731     i = array_index_nospec(arg, MAX_LEC_ITF);
0732     if (!dev_lec[i]) {
0733         int size;
0734
0735         size = sizeof(struct lec_priv);
0736         dev_lec[i] = alloc_etherdev(size);
0737         if (!dev_lec[i])
0738             return -ENOMEM;
0739         dev_lec[i]->netdev_ops = &lec_netdev_ops;
0740         dev_lec[i]->max_mtu = 18190;
0741         snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
0742         if (register_netdev(dev_lec[i])) {
0743             free_netdev(dev_lec[i]);
0744             return -EINVAL;
0745         }
0746
0747         priv = netdev_priv(dev_lec[i]);
0748     } else {
0749         priv = netdev_priv(dev_lec[i]);
0750         if (priv->lecd)
0751             return -EADDRINUSE;
0752     }
0753     lec_arp_init(priv);
0754     priv->itfnum = i;   /* LANE2 addition */
0755     priv->lecd = vcc;
0756     vcc->dev = &lecatm_dev;
0757     vcc_insert_socket(sk_atm(vcc));
0758
0759     vcc->proto_data = dev_lec[i];
0760     set_bit(ATM_VF_META, &vcc->flags);
0761     set_bit(ATM_VF_READY, &vcc->flags);
0762
0763     /* Set default values to these variables */
0764     priv->maximum_unknown_frame_count = 1;
0765     priv->max_unknown_frame_time = (1 * HZ);
0766     priv->vcc_timeout_period = (1200 * HZ);
0767     priv->max_retry_count = 1;
0768     priv->aging_time = (300 * HZ);
0769     priv->forward_delay_time = (15 * HZ);
0770     priv->topology_change = 0;
0771     priv->arp_response_time = (1 * HZ);
0772     priv->flush_timeout = (4 * HZ);
0773     priv->path_switching_delay = (6 * HZ);
0774
0775     if (dev_lec[i]->flags & IFF_UP)
0776         netif_start_queue(dev_lec[i]);
0777     __module_get(THIS_MODULE);
0778     return i;
0779 }
0780
0781 #ifdef CONFIG_PROC_FS
0782 static const char *lec_arp_get_status_string(unsigned char status)
0783 {
0784     static const char *const lec_arp_status_string[] = {
0785         "ESI_UNKNOWN       ",
0786         "ESI_ARP_PENDING   ",
0787         "ESI_VC_PENDING    ",
0788         "<Undefined>       ",
0789         "ESI_FLUSH_PENDING ",
0790         "ESI_FORWARD_DIRECT"
0791     };
0792
0793     if (status > ESI_FORWARD_DIRECT)
0794         status = 3; /* ESI_UNDEFINED */
0795     return lec_arp_status_string[status];
0796 }
0797
0798 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
0799 {
0800     seq_printf(seq, "%pM ", entry->mac_addr);
0801     seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr);
0802     seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status),
0803            entry->flags & 0xffff);
0804     if (entry->vcc)
0805         seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
0806     else
0807         seq_printf(seq, "        ");
0808     if (entry->recv_vcc) {
0809         seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
0810                entry->recv_vcc->vci);
0811     }
0812     seq_putc(seq, '\n');
0813 }
0814
0815 struct lec_state {
0816     unsigned long flags;
0817     struct lec_priv *locked;
0818     struct hlist_node *node;
0819     struct net_device *dev;
0820     int itf;
0821     int arp_table;
0822     int misc_table;
0823 };
0824
0825 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
0826               loff_t *l)
0827 {
0828     struct hlist_node *e = state->node;
0829
0830     if (!e)
0831         e = tbl->first;
0832     if (e == SEQ_START_TOKEN) {
0833         e = tbl->first;
0834         --*l;
0835     }
0836
0837     for (; e; e = e->next) {
0838         if (--*l < 0)
0839             break;
0840     }
0841     state->node = e;
0842
0843     return (*l < 0) ? state : NULL;
0844 }
0845
0846 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
0847               struct lec_priv *priv)
0848 {
0849     void *v = NULL;
0850     int p;
0851
0852     for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
0853         v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
0854         if (v)
0855             break;
0856     }
0857     state->arp_table = p;
0858     return v;
0859 }
0860
0861 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
0862                struct lec_priv *priv)
0863 {
0864     struct hlist_head *lec_misc_tables[] = {
0865         &priv->lec_arp_empty_ones,
0866         &priv->lec_no_forward,
0867         &priv->mcast_fwds
0868     };
0869     void *v = NULL;
0870     int q;
0871
0872     for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
0873         v = lec_tbl_walk(state, lec_misc_tables[q], l);
0874         if (v)
0875             break;
0876     }
0877     state->misc_table = q;
0878     return v;
0879 }
0880
0881 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
0882                struct lec_priv *priv)
0883 {
0884     if (!state->locked) {
0885         state->locked = priv;
0886         spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
0887     }
0888     if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
0889         spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
0890         state->locked = NULL;
0891         /* Partial state reset for the next time we get called */
0892         state->arp_table = state->misc_table = 0;
0893     }
0894     return state->locked;
0895 }
0896
0897 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
0898 {
0899     struct net_device *dev;
0900     void *v;
0901
0902     dev = state->dev ? state->dev : dev_lec[state->itf];
0903     v = (dev && netdev_priv(dev)) ?
0904         lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
0905     if (!v && dev) {
0906         dev_put(dev);
0907         /* Partial state reset for the next time we get called */
0908         dev = NULL;
0909     }
0910     state->dev = dev;
0911     return v;
0912 }
0913
0914 static void *lec_get_idx(struct lec_state *state, loff_t l)
0915 {
0916     void *v = NULL;
0917
0918     for (; state->itf < MAX_LEC_ITF; state->itf++) {
0919         v = lec_itf_walk(state, &l);
0920         if (v)
0921             break;
0922     }
0923     return v;
0924 }
0925
0926 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
0927 {
0928     struct lec_state *state = seq->private;
0929
0930     state->itf = 0;
0931     state->dev = NULL;
0932     state->locked = NULL;
0933     state->arp_table = 0;
0934     state->misc_table = 0;
0935     state->node = SEQ_START_TOKEN;
0936
0937     return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
0938 }
0939
0940 static void lec_seq_stop(struct seq_file *seq, void *v)
0941 {
0942     struct lec_state *state = seq->private;
0943
0944     if (state->dev) {
0945         spin_unlock_irqrestore(&state->locked->lec_arp_lock,
0946                        state->flags);
0947         dev_put(state->dev);
0948     }
0949 }
0950
0951 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
0952 {
0953     struct lec_state *state = seq->private;
0954
0955     ++*pos;
0956     return lec_get_idx(state, 1);
0957 }
0958
0959 static int lec_seq_show(struct seq_file *seq, void *v)
0960 {
0961     static const char lec_banner[] =
0962         "Itf  MAC          ATM destination"
0963         "                          Status            Flags "
0964         "VPI/VCI Recv VPI/VCI\n";
0965
0966     if (v == SEQ_START_TOKEN)
0967         seq_puts(seq, lec_banner);
0968     else {
0969         struct lec_state *state = seq->private;
0970         struct net_device *dev = state->dev;
0971         struct lec_arp_table *entry = hlist_entry(state->node,
0972                               struct lec_arp_table,
0973                               next);
0974
0975         seq_printf(seq, "%s ", dev->name);
0976         lec_info(seq, entry);
0977     }
0978     return 0;
0979 }
0980
0981 static const struct seq_operations lec_seq_ops = {
0982     .start = lec_seq_start,
0983     .next = lec_seq_next,
0984     .stop = lec_seq_stop,
0985     .show = lec_seq_show,
0986 };
0987 #endif
0988
0989 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
0990 {
0991     struct atm_vcc *vcc = ATM_SD(sock);
0992     int err = 0;
0993
0994     switch (cmd) {
0995     case ATMLEC_CTRL:
0996     case ATMLEC_MCAST:
0997     case ATMLEC_DATA:
0998         if (!capable(CAP_NET_ADMIN))
0999             return -EPERM;
1000         break;
1001     default:
1002         return -ENOIOCTLCMD;
1003     }
1004
1005     switch (cmd) {
1006     case ATMLEC_CTRL:
1007         err = lecd_attach(vcc, (int)arg);
1008         if (err >= 0)
1009             sock->state = SS_CONNECTED;
1010         break;
1011     case ATMLEC_MCAST:
1012         err = lec_mcast_attach(vcc, (int)arg);
1013         break;
1014     case ATMLEC_DATA:
1015         err = lec_vcc_attach(vcc, (void __user *)arg);
1016         break;
1017     }
1018
1019     return err;
1020 }
1021
1022 static struct atm_ioctl lane_ioctl_ops = {
1023     .owner = THIS_MODULE,
1024     .ioctl = lane_ioctl,
1025 };
1026
1027 static int __init lane_module_init(void)
1028 {
1029 #ifdef CONFIG_PROC_FS
1030     struct proc_dir_entry *p;
1031
1032     p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1033             sizeof(struct lec_state), NULL);
1034     if (!p) {
1035         pr_err("Unable to initialize /proc/net/atm/lec\n");
1036         return -ENOMEM;
1037     }
1038 #endif
1039
1040     register_atm_ioctl(&lane_ioctl_ops);
1041     pr_info("lec.c: initialized\n");
1042     return 0;
1043 }
1044
1045 static void __exit lane_module_cleanup(void)
1046 {
1047     int i;
1048
1049 #ifdef CONFIG_PROC_FS
1050     remove_proc_entry("lec", atm_proc_root);
1051 #endif
1052
1053     deregister_atm_ioctl(&lane_ioctl_ops);
1054
1055     for (i = 0; i < MAX_LEC_ITF; i++) {
1056         if (dev_lec[i] != NULL) {
1057             unregister_netdev(dev_lec[i]);
1058             free_netdev(dev_lec[i]);
1059             dev_lec[i] = NULL;
1060         }
1061     }
1062 }
1063
1064 module_init(lane_module_init);
1065 module_exit(lane_module_cleanup);
1066
1067 /*
1068  * LANE2: 3.1.3, LE_RESOLVE.request
1069  * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1070  * If sizeoftlvs == NULL the default TLVs associated with this
1071  * lec will be used.
1072  * If dst_mac == NULL, targetless LE_ARP will be sent
1073  */
1074 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1075              u8 **tlvs, u32 *sizeoftlvs)
1076 {
1077     unsigned long flags;
1078     struct lec_priv *priv = netdev_priv(dev);
1079     struct lec_arp_table *table;
1080     struct sk_buff *skb;
1081     int retval;
1082
1083     if (force == 0) {
1084         spin_lock_irqsave(&priv->lec_arp_lock, flags);
1085         table = lec_arp_find(priv, dst_mac);
1086         spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1087         if (table == NULL)
1088             return -1;
1089
1090         *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1091         if (*tlvs == NULL)
1092             return -1;
1093
1094         *sizeoftlvs = table->sizeoftlvs;
1095
1096         return 0;
1097     }
1098
1099     if (sizeoftlvs == NULL)
1100         retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1101
1102     else {
1103         skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1104         if (skb == NULL)
1105             return -1;
1106         skb->len = *sizeoftlvs;
1107         skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1108         retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1109     }
1110     return retval;
1111 }
1112
1113 /*
1114  * LANE2: 3.1.4, LE_ASSOCIATE.request
1115  * Associate the *tlvs with the *lan_dst address.
1116  * Will overwrite any previous association
1117  * Returns 1 for success, 0 for failure (out of memory)
1118  *
1119  */
1120 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1121                    const u8 *tlvs, u32 sizeoftlvs)
1122 {
1123     int retval;
1124     struct sk_buff *skb;
1125     struct lec_priv *priv = netdev_priv(dev);
1126
1127     if (!ether_addr_equal(lan_dst, dev->dev_addr))
1128         return 0;   /* not our mac address */
1129
1130     kfree(priv->tlvs);  /* NULL if there was no previous association */
1131
1132     priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1133     if (priv->tlvs == NULL)
1134         return 0;
1135     priv->sizeoftlvs = sizeoftlvs;
1136
1137     skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1138     if (skb == NULL)
1139         return 0;
1140     skb->len = sizeoftlvs;
1141     skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1142     retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1143     if (retval != 0)
1144         pr_info("lec.c: lane2_associate_req() failed\n");
1145     /*
1146      * If the previous association has changed we must
1147      * somehow notify other LANE entities about the change
1148      */
1149     return 1;
1150 }
1151
1152 /*
1153  * LANE2: 3.1.5, LE_ASSOCIATE.indication
1154  *
1155  */
1156 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1157                 const u8 *tlvs, u32 sizeoftlvs)
1158 {
1159 #if 0
1160     int i = 0;
1161 #endif
1162     struct lec_priv *priv = netdev_priv(dev);
1163 #if 0               /*
1164                  * Why have the TLVs in LE_ARP entries
1165                  * since we do not use them? When you
1166                  * uncomment this code, make sure the
1167                  * TLVs get freed when entry is killed
1168                  */
1169     struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1170
1171     if (entry == NULL)
1172         return;     /* should not happen */
1173
1174     kfree(entry->tlvs);
1175
1176     entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1177     if (entry->tlvs == NULL)
1178         return;
1179     entry->sizeoftlvs = sizeoftlvs;
1180 #endif
1181 #if 0
1182     pr_info("\n");
1183     pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1184     while (i < sizeoftlvs)
1185         pr_cont("%02x ", tlvs[i++]);
1186
1187     pr_cont("\n");
1188 #endif
1189
1190     /* tell MPOA about the TLVs we saw */
1191     if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1192         priv->lane2_ops->associate_indicator(dev, mac_addr,
1193                              tlvs, sizeoftlvs);
1194     }
1195 }
1196
1197 /*
1198  * Here starts what used to lec_arpc.c
1199  *
1200  * lec_arpc.c was added here when making
1201  * lane client modular. October 1997
1202  */
1203
1204 #include <linux/types.h>
1205 #include <linux/timer.h>
1206 #include <linux/param.h>
1207 #include <linux/atomic.h>
1208 #include <linux/inetdevice.h>
1209 #include <net/route.h>
1210
1211 #if 0
1212 #define pr_debug(format, args...)
1213 /*
1214   #define pr_debug printk
1215 */
1216 #endif
1217 #define DEBUG_ARP_TABLE 0
1218
1219 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1220
1221 static void lec_arp_check_expire(struct work_struct *work);
1222 static void lec_arp_expire_arp(struct timer_list *t);
1223
1224 /*
1225  * Arp table funcs
1226  */
1227
1228 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1229
1230 /*
1231  * Initialization of arp-cache
1232  */
1233 static void lec_arp_init(struct lec_priv *priv)
1234 {
1235     unsigned short i;
1236
1237     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1238         INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1239     INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1240     INIT_HLIST_HEAD(&priv->lec_no_forward);
1241     INIT_HLIST_HEAD(&priv->mcast_fwds);
1242     spin_lock_init(&priv->lec_arp_lock);
1243     INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1244     schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1245 }
1246
1247 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1248 {
1249     if (entry->vcc) {
1250         struct atm_vcc *vcc = entry->vcc;
1251         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1252         struct net_device *dev = (struct net_device *)vcc->proto_data;
1253
1254         vcc->pop = vpriv->old_pop;
1255         if (vpriv->xoff)
1256             netif_wake_queue(dev);
1257         kfree(vpriv);
1258         vcc->user_back = NULL;
1259         vcc->push = entry->old_push;
1260         vcc_release_async(vcc, -EPIPE);
1261         entry->vcc = NULL;
1262     }
1263     if (entry->recv_vcc) {
1264         struct atm_vcc *vcc = entry->recv_vcc;
1265         struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1266
1267         kfree(vpriv);
1268         vcc->user_back = NULL;
1269
1270         entry->recv_vcc->push = entry->old_recv_push;
1271         vcc_release_async(entry->recv_vcc, -EPIPE);
1272         entry->recv_vcc = NULL;
1273     }
1274 }
1275
1276 /*
1277  * Insert entry to lec_arp_table
1278  * LANE2: Add to the end of the list to satisfy 8.1.13
1279  */
1280 static inline void
1281 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1282 {
1283     struct hlist_head *tmp;
1284
1285     tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1286     hlist_add_head(&entry->next, tmp);
1287
1288     pr_debug("Added entry:%pM\n", entry->mac_addr);
1289 }
1290
1291 /*
1292  * Remove entry from lec_arp_table
1293  */
1294 static int
1295 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1296 {
1297     struct lec_arp_table *entry;
1298     int i, remove_vcc = 1;
1299
1300     if (!to_remove)
1301         return -1;
1302
1303     hlist_del(&to_remove->next);
1304     del_timer(&to_remove->timer);
1305
1306     /*
1307      * If this is the only MAC connected to this VCC,
1308      * also tear down the VCC
1309      */
1310     if (to_remove->status >= ESI_FLUSH_PENDING) {
1311         /*
1312          * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1313          */
1314         for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1315             hlist_for_each_entry(entry,
1316                          &priv->lec_arp_tables[i], next) {
1317                 if (memcmp(to_remove->atm_addr,
1318                        entry->atm_addr, ATM_ESA_LEN) == 0) {
1319                     remove_vcc = 0;
1320                     break;
1321                 }
1322             }
1323         }
1324         if (remove_vcc)
1325             lec_arp_clear_vccs(to_remove);
1326     }
1327     skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */
1328
1329     pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1330     return 0;
1331 }
1332
1333 #if DEBUG_ARP_TABLE
1334 static const char *get_status_string(unsigned char st)
1335 {
1336     switch (st) {
1337     case ESI_UNKNOWN:
1338         return "ESI_UNKNOWN";
1339     case ESI_ARP_PENDING:
1340         return "ESI_ARP_PENDING";
1341     case ESI_VC_PENDING:
1342         return "ESI_VC_PENDING";
1343     case ESI_FLUSH_PENDING:
1344         return "ESI_FLUSH_PENDING";
1345     case ESI_FORWARD_DIRECT:
1346         return "ESI_FORWARD_DIRECT";
1347     }
1348     return "<UNKNOWN>";
1349 }
1350
1351 static void dump_arp_table(struct lec_priv *priv)
1352 {
1353     struct lec_arp_table *rulla;
1354     char buf[256];
1355     int i, offset;
1356
1357     pr_info("Dump %p:\n", priv);
1358     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1359         hlist_for_each_entry(rulla,
1360                      &priv->lec_arp_tables[i], next) {
1361             offset = 0;
1362             offset += sprintf(buf, "%d: %p\n", i, rulla);
1363             offset += sprintf(buf + offset, "Mac: %pM ",
1364                       rulla->mac_addr);
1365             offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1366                       rulla->atm_addr);
1367             offset += sprintf(buf + offset,
1368                       "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1369                       rulla->vcc ? rulla->vcc->vpi : 0,
1370                       rulla->vcc ? rulla->vcc->vci : 0,
1371                       rulla->recv_vcc ? rulla->recv_vcc->
1372                       vpi : 0,
1373                       rulla->recv_vcc ? rulla->recv_vcc->
1374                       vci : 0, rulla->last_used,
1375                       rulla->timestamp, rulla->no_tries);
1376             offset +=
1377                 sprintf(buf + offset,
1378                     "Flags:%x, Packets_flooded:%x, Status: %s ",
1379                     rulla->flags, rulla->packets_flooded,
1380                     get_status_string(rulla->status));
1381             pr_info("%s\n", buf);
1382         }
1383     }
1384
1385     if (!hlist_empty(&priv->lec_no_forward))
1386         pr_info("No forward\n");
1387     hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1388         offset = 0;
1389         offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1390         offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1391                   rulla->atm_addr);
1392         offset += sprintf(buf + offset,
1393                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1394                   rulla->vcc ? rulla->vcc->vpi : 0,
1395                   rulla->vcc ? rulla->vcc->vci : 0,
1396                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1397                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1398                   rulla->last_used,
1399                   rulla->timestamp, rulla->no_tries);
1400         offset += sprintf(buf + offset,
1401                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1402                   rulla->flags, rulla->packets_flooded,
1403                   get_status_string(rulla->status));
1404         pr_info("%s\n", buf);
1405     }
1406
1407     if (!hlist_empty(&priv->lec_arp_empty_ones))
1408         pr_info("Empty ones\n");
1409     hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1410         offset = 0;
1411         offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1412         offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1413                   rulla->atm_addr);
1414         offset += sprintf(buf + offset,
1415                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1416                   rulla->vcc ? rulla->vcc->vpi : 0,
1417                   rulla->vcc ? rulla->vcc->vci : 0,
1418                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1419                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1420                   rulla->last_used,
1421                   rulla->timestamp, rulla->no_tries);
1422         offset += sprintf(buf + offset,
1423                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1424                   rulla->flags, rulla->packets_flooded,
1425                   get_status_string(rulla->status));
1426         pr_info("%s", buf);
1427     }
1428
1429     if (!hlist_empty(&priv->mcast_fwds))
1430         pr_info("Multicast Forward VCCs\n");
1431     hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1432         offset = 0;
1433         offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1434         offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1435                   rulla->atm_addr);
1436         offset += sprintf(buf + offset,
1437                   "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1438                   rulla->vcc ? rulla->vcc->vpi : 0,
1439                   rulla->vcc ? rulla->vcc->vci : 0,
1440                   rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1441                   rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1442                   rulla->last_used,
1443                   rulla->timestamp, rulla->no_tries);
1444         offset += sprintf(buf + offset,
1445                   "Flags:%x, Packets_flooded:%x, Status: %s ",
1446                   rulla->flags, rulla->packets_flooded,
1447                   get_status_string(rulla->status));
1448         pr_info("%s\n", buf);
1449     }
1450
1451 }
1452 #else
1453 #define dump_arp_table(priv) do { } while (0)
1454 #endif
1455
1456 /*
1457  * Destruction of arp-cache
1458  */
1459 static void lec_arp_destroy(struct lec_priv *priv)
1460 {
1461     unsigned long flags;
1462     struct hlist_node *next;
1463     struct lec_arp_table *entry;
1464     int i;
1465
1466     cancel_delayed_work_sync(&priv->lec_arp_work);
1467
1468     /*
1469      * Remove all entries
1470      */
1471
1472     spin_lock_irqsave(&priv->lec_arp_lock, flags);
1473     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1474         hlist_for_each_entry_safe(entry, next,
1475                       &priv->lec_arp_tables[i], next) {
1476             lec_arp_remove(priv, entry);
1477             lec_arp_put(entry);
1478         }
1479         INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1480     }
1481
1482     hlist_for_each_entry_safe(entry, next,
1483                   &priv->lec_arp_empty_ones, next) {
1484         del_timer_sync(&entry->timer);
1485         lec_arp_clear_vccs(entry);
1486         hlist_del(&entry->next);
1487         lec_arp_put(entry);
1488     }
1489     INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1490
1491     hlist_for_each_entry_safe(entry, next,
1492                   &priv->lec_no_forward, next) {
1493         del_timer_sync(&entry->timer);
1494         lec_arp_clear_vccs(entry);
1495         hlist_del(&entry->next);
1496         lec_arp_put(entry);
1497     }
1498     INIT_HLIST_HEAD(&priv->lec_no_forward);
1499
1500     hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1501         /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1502         lec_arp_clear_vccs(entry);
1503         hlist_del(&entry->next);
1504         lec_arp_put(entry);
1505     }
1506     INIT_HLIST_HEAD(&priv->mcast_fwds);
1507     priv->mcast_vcc = NULL;
1508     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1509 }
1510
1511 /*
1512  * Find entry by mac_address
1513  */
1514 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1515                       const unsigned char *mac_addr)
1516 {
1517     struct hlist_head *head;
1518     struct lec_arp_table *entry;
1519
1520     pr_debug("%pM\n", mac_addr);
1521
1522     head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1523     hlist_for_each_entry(entry, head, next) {
1524         if (ether_addr_equal(mac_addr, entry->mac_addr))
1525             return entry;
1526     }
1527     return NULL;
1528 }
1529
1530 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1531                     const unsigned char *mac_addr)
1532 {
1533     struct lec_arp_table *to_return;
1534
1535     to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1536     if (!to_return)
1537         return NULL;
1538     ether_addr_copy(to_return->mac_addr, mac_addr);
1539     INIT_HLIST_NODE(&to_return->next);
1540     timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1541     to_return->last_used = jiffies;
1542     to_return->priv = priv;
1543     skb_queue_head_init(&to_return->tx_wait);
1544     refcount_set(&to_return->usage, 1);
1545     return to_return;
1546 }
1547
1548 /* Arp sent timer expired */
1549 static void lec_arp_expire_arp(struct timer_list *t)
1550 {
1551     struct lec_arp_table *entry;
1552
1553     entry = from_timer(entry, t, timer);
1554
1555     pr_debug("\n");
1556     if (entry->status == ESI_ARP_PENDING) {
1557         if (entry->no_tries <= entry->priv->max_retry_count) {
1558             if (entry->is_rdesc)
1559                 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1560                          entry->mac_addr, NULL, NULL);
1561             else
1562                 send_to_lecd(entry->priv, l_arp_xmt,
1563                          entry->mac_addr, NULL, NULL);
1564             entry->no_tries++;
1565         }
1566         mod_timer(&entry->timer, jiffies + (1 * HZ));
1567     }
1568 }
1569
1570 /* Unknown/unused vcc expire, remove associated entry */
1571 static void lec_arp_expire_vcc(struct timer_list *t)
1572 {
1573     unsigned long flags;
1574     struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1575     struct lec_priv *priv = to_remove->priv;
1576
1577     del_timer(&to_remove->timer);
1578
1579     pr_debug("%p %p: vpi:%d vci:%d\n",
1580          to_remove, priv,
1581          to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1582          to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1583
1584     spin_lock_irqsave(&priv->lec_arp_lock, flags);
1585     hlist_del(&to_remove->next);
1586     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1587
1588     lec_arp_clear_vccs(to_remove);
1589     lec_arp_put(to_remove);
1590 }
1591
1592 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1593                    unsigned long now,
1594                    struct lec_priv *priv)
1595 {
1596     unsigned long time_to_check;
1597
1598     if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1599         time_to_check = priv->forward_delay_time;
1600     else
1601         time_to_check = priv->aging_time;
1602
1603     pr_debug("About to expire: %lx - %lx > %lx\n",
1604          now, entry->last_used, time_to_check);
1605     if (time_after(now, entry->last_used + time_to_check) &&
1606         !(entry->flags & LEC_PERMANENT_FLAG) &&
1607         !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1608         /* Remove entry */
1609         pr_debug("Entry timed out\n");
1610         lec_arp_remove(priv, entry);
1611         lec_arp_put(entry);
1612     } else {
1613         /* Something else */
1614         if ((entry->status == ESI_VC_PENDING ||
1615              entry->status == ESI_ARP_PENDING) &&
1616             time_after_eq(now, entry->timestamp +
1617                        priv->max_unknown_frame_time)) {
1618             entry->timestamp = jiffies;
1619             entry->packets_flooded = 0;
1620             if (entry->status == ESI_VC_PENDING)
1621                 send_to_lecd(priv, l_svc_setup,
1622                          entry->mac_addr,
1623                          entry->atm_addr,
1624                          NULL);
1625         }
1626         if (entry->status == ESI_FLUSH_PENDING &&
1627             time_after_eq(now, entry->timestamp +
1628                        priv->path_switching_delay)) {
1629             lec_arp_hold(entry);
1630             return true;
1631         }
1632     }
1633
1634     return false;
1635 }
1636 /*
1637  * Expire entries.
1638  * 1. Re-set timer
1639  * 2. For each entry, delete entries that have aged past the age limit.
1640  * 3. For each entry, depending on the status of the entry, perform
1641  *    the following maintenance.
1642  *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1643  *       tick_count is above the max_unknown_frame_time, clear
1644  *       the tick_count to zero and clear the packets_flooded counter
1645  *       to zero. This supports the packet rate limit per address
1646  *       while flooding unknowns.
1647  *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1648  *       than or equal to the path_switching_delay, change the status
1649  *       to ESI_FORWARD_DIRECT. This causes the flush period to end
1650  *       regardless of the progress of the flush protocol.
1651  */
1652 static void lec_arp_check_expire(struct work_struct *work)
1653 {
1654     unsigned long flags;
1655     struct lec_priv *priv =
1656         container_of(work, struct lec_priv, lec_arp_work.work);
1657     struct hlist_node *next;
1658     struct lec_arp_table *entry;
1659     unsigned long now;
1660     int i;
1661
1662     pr_debug("%p\n", priv);
1663     now = jiffies;
1664 restart:
1665     spin_lock_irqsave(&priv->lec_arp_lock, flags);
1666     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1667         hlist_for_each_entry_safe(entry, next,
1668                       &priv->lec_arp_tables[i], next) {
1669             if (__lec_arp_check_expire(entry, now, priv)) {
1670                 struct sk_buff *skb;
1671                 struct atm_vcc *vcc = entry->vcc;
1672
1673                 spin_unlock_irqrestore(&priv->lec_arp_lock,
1674                                flags);
1675                 while ((skb = skb_dequeue(&entry->tx_wait)))
1676                     lec_send(vcc, skb);
1677                 entry->last_used = jiffies;
1678                 entry->status = ESI_FORWARD_DIRECT;
1679                 lec_arp_put(entry);
1680
1681                 goto restart;
1682             }
1683         }
1684     }
1685     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1686
1687     schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1688 }
1689
1690 /*
1691  * Try to find vcc where mac_address is attached.
1692  *
1693  */
1694 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1695                        const unsigned char *mac_to_find,
1696                        int is_rdesc,
1697                        struct lec_arp_table **ret_entry)
1698 {
1699     unsigned long flags;
1700     struct lec_arp_table *entry;
1701     struct atm_vcc *found;
1702
1703     if (mac_to_find[0] & 0x01) {
1704         switch (priv->lane_version) {
1705         case 1:
1706             return priv->mcast_vcc;
1707         case 2: /* LANE2 wants arp for multicast addresses */
1708             if (ether_addr_equal(mac_to_find, bus_mac))
1709                 return priv->mcast_vcc;
1710             break;
1711         default:
1712             break;
1713         }
1714     }
1715
1716     spin_lock_irqsave(&priv->lec_arp_lock, flags);
1717     entry = lec_arp_find(priv, mac_to_find);
1718
1719     if (entry) {
1720         if (entry->status == ESI_FORWARD_DIRECT) {
1721             /* Connection Ok */
1722             entry->last_used = jiffies;
1723             lec_arp_hold(entry);
1724             *ret_entry = entry;
1725             found = entry->vcc;
1726             goto out;
1727         }
1728         /*
1729          * If the LE_ARP cache entry is still pending, reset count to 0
1730          * so another LE_ARP request can be made for this frame.
1731          */
1732         if (entry->status == ESI_ARP_PENDING)
1733             entry->no_tries = 0;
1734         /*
1735          * Data direct VC not yet set up, check to see if the unknown
1736          * frame count is greater than the limit. If the limit has
1737          * not been reached, allow the caller to send packet to
1738          * BUS.
1739          */
1740         if (entry->status != ESI_FLUSH_PENDING &&
1741             entry->packets_flooded <
1742             priv->maximum_unknown_frame_count) {
1743             entry->packets_flooded++;
1744             pr_debug("Flooding..\n");
1745             found = priv->mcast_vcc;
1746             goto out;
1747         }
1748         /*
1749          * We got here because entry->status == ESI_FLUSH_PENDING
1750          * or BUS flood limit was reached for an entry which is
1751          * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1752          */
1753         lec_arp_hold(entry);
1754         *ret_entry = entry;
1755         pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1756              entry->vcc);
1757         found = NULL;
1758     } else {
1759         /* No matching entry was found */
1760         entry = make_entry(priv, mac_to_find);
1761         pr_debug("Making entry\n");
1762         if (!entry) {
1763             found = priv->mcast_vcc;
1764             goto out;
1765         }
1766         lec_arp_add(priv, entry);
1767         /* We want arp-request(s) to be sent */
1768         entry->packets_flooded = 1;
1769         entry->status = ESI_ARP_PENDING;
1770         entry->no_tries = 1;
1771         entry->last_used = entry->timestamp = jiffies;
1772         entry->is_rdesc = is_rdesc;
1773         if (entry->is_rdesc)
1774             send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1775                      NULL);
1776         else
1777             send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1778         entry->timer.expires = jiffies + (1 * HZ);
1779         entry->timer.function = lec_arp_expire_arp;
1780         add_timer(&entry->timer);
1781         found = priv->mcast_vcc;
1782     }
1783
1784 out:
1785     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1786     return found;
1787 }
1788
1789 static int
1790 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1791         unsigned long permanent)
1792 {
1793     unsigned long flags;
1794     struct hlist_node *next;
1795     struct lec_arp_table *entry;
1796     int i;
1797
1798     pr_debug("\n");
1799     spin_lock_irqsave(&priv->lec_arp_lock, flags);
1800     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1801         hlist_for_each_entry_safe(entry, next,
1802                       &priv->lec_arp_tables[i], next) {
1803             if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1804                 (permanent ||
1805                  !(entry->flags & LEC_PERMANENT_FLAG))) {
1806                 lec_arp_remove(priv, entry);
1807                 lec_arp_put(entry);
1808             }
1809             spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1810             return 0;
1811         }
1812     }
1813     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1814     return -1;
1815 }
1816
1817 /*
1818  * Notifies:  Response to arp_request (atm_addr != NULL)
1819  */
1820 static void
1821 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1822            const unsigned char *atm_addr, unsigned long remoteflag,
1823            unsigned int targetless_le_arp)
1824 {
1825     unsigned long flags;
1826     struct hlist_node *next;
1827     struct lec_arp_table *entry, *tmp;
1828     int i;
1829
1830     pr_debug("%smac:%pM\n",
1831          (targetless_le_arp) ? "targetless " : "", mac_addr);
1832
1833     spin_lock_irqsave(&priv->lec_arp_lock, flags);
1834     entry = lec_arp_find(priv, mac_addr);
1835     if (entry == NULL && targetless_le_arp)
1836         goto out;   /*
1837                  * LANE2: ignore targetless LE_ARPs for which
1838                  * we have no entry in the cache. 7.1.30
1839                  */
1840     if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1841         hlist_for_each_entry_safe(entry, next,
1842                       &priv->lec_arp_empty_ones, next) {
1843             if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1844                 hlist_del(&entry->next);
1845                 del_timer(&entry->timer);
1846                 tmp = lec_arp_find(priv, mac_addr);
1847                 if (tmp) {
1848                     del_timer(&tmp->timer);
1849                     tmp->status = ESI_FORWARD_DIRECT;
1850                     memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1851                     tmp->vcc = entry->vcc;
1852                     tmp->old_push = entry->old_push;
1853                     tmp->last_used = jiffies;
1854                     del_timer(&entry->timer);
1855                     lec_arp_put(entry);
1856                     entry = tmp;
1857                 } else {
1858                     entry->status = ESI_FORWARD_DIRECT;
1859                     ether_addr_copy(entry->mac_addr,
1860                             mac_addr);
1861                     entry->last_used = jiffies;
1862                     lec_arp_add(priv, entry);
1863                 }
1864                 if (remoteflag)
1865                     entry->flags |= LEC_REMOTE_FLAG;
1866                 else
1867                     entry->flags &= ~LEC_REMOTE_FLAG;
1868                 pr_debug("After update\n");
1869                 dump_arp_table(priv);
1870                 goto out;
1871             }
1872         }
1873     }
1874
1875     entry = lec_arp_find(priv, mac_addr);
1876     if (!entry) {
1877         entry = make_entry(priv, mac_addr);
1878         if (!entry)
1879             goto out;
1880         entry->status = ESI_UNKNOWN;
1881         lec_arp_add(priv, entry);
1882         /* Temporary, changes before end of function */
1883     }
1884     memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1885     del_timer(&entry->timer);
1886     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1887         hlist_for_each_entry(tmp,
1888                      &priv->lec_arp_tables[i], next) {
1889             if (entry != tmp &&
1890                 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1891                 /* Vcc to this host exists */
1892                 if (tmp->status > ESI_VC_PENDING) {
1893                     /*
1894                      * ESI_FLUSH_PENDING,
1895                      * ESI_FORWARD_DIRECT
1896                      */
1897                     entry->vcc = tmp->vcc;
1898                     entry->old_push = tmp->old_push;
1899                 }
1900                 entry->status = tmp->status;
1901                 break;
1902             }
1903         }
1904     }
1905     if (remoteflag)
1906         entry->flags |= LEC_REMOTE_FLAG;
1907     else
1908         entry->flags &= ~LEC_REMOTE_FLAG;
1909     if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1910         entry->status = ESI_VC_PENDING;
1911         send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1912     }
1913     pr_debug("After update2\n");
1914     dump_arp_table(priv);
1915 out:
1916     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1917 }
1918
1919 /*
1920  * Notifies: Vcc setup ready
1921  */
1922 static void
1923 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1924           struct atm_vcc *vcc,
1925           void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1926 {
1927     unsigned long flags;
1928     struct lec_arp_table *entry;
1929     int i, found_entry = 0;
1930
1931     spin_lock_irqsave(&priv->lec_arp_lock, flags);
1932     /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1933     if (ioc_data->receive == 2) {
1934         pr_debug("LEC_ARP: Attaching mcast forward\n");
1935 #if 0
1936         entry = lec_arp_find(priv, bus_mac);
1937         if (!entry) {
1938             pr_info("LEC_ARP: Multicast entry not found!\n");
1939             goto out;
1940         }
1941         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1942         entry->recv_vcc = vcc;
1943         entry->old_recv_push = old_push;
1944 #endif
1945         entry = make_entry(priv, bus_mac);
1946         if (entry == NULL)
1947             goto out;
1948         del_timer(&entry->timer);
1949         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1950         entry->recv_vcc = vcc;
1951         entry->old_recv_push = old_push;
1952         hlist_add_head(&entry->next, &priv->mcast_fwds);
1953         goto out;
1954     } else if (ioc_data->receive == 1) {
1955         /*
1956          * Vcc which we don't want to make default vcc,
1957          * attach it anyway.
1958          */
1959         pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
1960              ATM_ESA_LEN, ioc_data->atm_addr);
1961         entry = make_entry(priv, bus_mac);
1962         if (entry == NULL)
1963             goto out;
1964         memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1965         eth_zero_addr(entry->mac_addr);
1966         entry->recv_vcc = vcc;
1967         entry->old_recv_push = old_push;
1968         entry->status = ESI_UNKNOWN;
1969         entry->timer.expires = jiffies + priv->vcc_timeout_period;
1970         entry->timer.function = lec_arp_expire_vcc;
1971         hlist_add_head(&entry->next, &priv->lec_no_forward);
1972         add_timer(&entry->timer);
1973         dump_arp_table(priv);
1974         goto out;
1975     }
1976     pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
1977          ATM_ESA_LEN, ioc_data->atm_addr);
1978     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1979         hlist_for_each_entry(entry,
1980                      &priv->lec_arp_tables[i], next) {
1981             if (memcmp
1982                 (ioc_data->atm_addr, entry->atm_addr,
1983                  ATM_ESA_LEN) == 0) {
1984                 pr_debug("LEC_ARP: Attaching data direct\n");
1985                 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
1986                      entry->vcc ? entry->vcc->vci : 0,
1987                      entry->recv_vcc ? entry->recv_vcc->
1988                      vci : 0);
1989                 found_entry = 1;
1990                 del_timer(&entry->timer);
1991                 entry->vcc = vcc;
1992                 entry->old_push = old_push;
1993                 if (entry->status == ESI_VC_PENDING) {
1994                     if (priv->maximum_unknown_frame_count
1995                         == 0)
1996                         entry->status =
1997                             ESI_FORWARD_DIRECT;
1998                     else {
1999                         entry->timestamp = jiffies;
2000                         entry->status =
2001                             ESI_FLUSH_PENDING;
2002 #if 0
2003                         send_to_lecd(priv, l_flush_xmt,
2004                                  NULL,
2005                                  entry->atm_addr,
2006                                  NULL);
2007 #endif
2008                     }
2009                 } else {
2010                     /*
2011                      * They were forming a connection
2012                      * to us, and we to them. Our
2013                      * ATM address is numerically lower
2014                      * than theirs, so we make connection
2015                      * we formed into default VCC (8.1.11).
2016                      * Connection they made gets torn
2017                      * down. This might confuse some
2018                      * clients. Can be changed if
2019                      * someone reports trouble...
2020                      */
2021                     ;
2022                 }
2023             }
2024         }
2025     }
2026     if (found_entry) {
2027         pr_debug("After vcc was added\n");
2028         dump_arp_table(priv);
2029         goto out;
2030     }
2031     /*
2032      * Not found, snatch address from first data packet that arrives
2033      * from this vcc
2034      */
2035     entry = make_entry(priv, bus_mac);
2036     if (!entry)
2037         goto out;
2038     entry->vcc = vcc;
2039     entry->old_push = old_push;
2040     memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2041     eth_zero_addr(entry->mac_addr);
2042     entry->status = ESI_UNKNOWN;
2043     hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2044     entry->timer.expires = jiffies + priv->vcc_timeout_period;
2045     entry->timer.function = lec_arp_expire_vcc;
2046     add_timer(&entry->timer);
2047     pr_debug("After vcc was added\n");
2048     dump_arp_table(priv);
2049 out:
2050     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2051 }
2052
2053 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2054 {
2055     unsigned long flags;
2056     struct lec_arp_table *entry;
2057     int i;
2058
2059     pr_debug("%lx\n", tran_id);
2060 restart:
2061     spin_lock_irqsave(&priv->lec_arp_lock, flags);
2062     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2063         hlist_for_each_entry(entry,
2064                      &priv->lec_arp_tables[i], next) {
2065             if (entry->flush_tran_id == tran_id &&
2066                 entry->status == ESI_FLUSH_PENDING) {
2067                 struct sk_buff *skb;
2068                 struct atm_vcc *vcc = entry->vcc;
2069
2070                 lec_arp_hold(entry);
2071                 spin_unlock_irqrestore(&priv->lec_arp_lock,
2072                                flags);
2073                 while ((skb = skb_dequeue(&entry->tx_wait)))
2074                     lec_send(vcc, skb);
2075                 entry->last_used = jiffies;
2076                 entry->status = ESI_FORWARD_DIRECT;
2077                 lec_arp_put(entry);
2078                 pr_debug("LEC_ARP: Flushed\n");
2079                 goto restart;
2080             }
2081         }
2082     }
2083     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2084     dump_arp_table(priv);
2085 }
2086
2087 static void
2088 lec_set_flush_tran_id(struct lec_priv *priv,
2089               const unsigned char *atm_addr, unsigned long tran_id)
2090 {
2091     unsigned long flags;
2092     struct lec_arp_table *entry;
2093     int i;
2094
2095     spin_lock_irqsave(&priv->lec_arp_lock, flags);
2096     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2097         hlist_for_each_entry(entry,
2098                      &priv->lec_arp_tables[i], next) {
2099             if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2100                 entry->flush_tran_id = tran_id;
2101                 pr_debug("Set flush transaction id to %lx for %p\n",
2102                      tran_id, entry);
2103             }
2104         }
2105     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2106 }
2107
2108 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2109 {
2110     unsigned long flags;
2111     unsigned char mac_addr[] = {
2112         0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2113     };
2114     struct lec_arp_table *to_add;
2115     struct lec_vcc_priv *vpriv;
2116     int err = 0;
2117
2118     vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2119     if (!vpriv)
2120         return -ENOMEM;
2121     vpriv->xoff = 0;
2122     vpriv->old_pop = vcc->pop;
2123     vcc->user_back = vpriv;
2124     vcc->pop = lec_pop;
2125     spin_lock_irqsave(&priv->lec_arp_lock, flags);
2126     to_add = make_entry(priv, mac_addr);
2127     if (!to_add) {
2128         vcc->pop = vpriv->old_pop;
2129         kfree(vpriv);
2130         err = -ENOMEM;
2131         goto out;
2132     }
2133     memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2134     to_add->status = ESI_FORWARD_DIRECT;
2135     to_add->flags |= LEC_PERMANENT_FLAG;
2136     to_add->vcc = vcc;
2137     to_add->old_push = vcc->push;
2138     vcc->push = lec_push;
2139     priv->mcast_vcc = vcc;
2140     lec_arp_add(priv, to_add);
2141 out:
2142     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2143     return err;
2144 }
2145
2146 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2147 {
2148     unsigned long flags;
2149     struct hlist_node *next;
2150     struct lec_arp_table *entry;
2151     int i;
2152
2153     pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2154     dump_arp_table(priv);
2155
2156     spin_lock_irqsave(&priv->lec_arp_lock, flags);
2157
2158     for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2159         hlist_for_each_entry_safe(entry, next,
2160                       &priv->lec_arp_tables[i], next) {
2161             if (vcc == entry->vcc) {
2162                 lec_arp_remove(priv, entry);
2163                 lec_arp_put(entry);
2164                 if (priv->mcast_vcc == vcc)
2165                     priv->mcast_vcc = NULL;
2166             }
2167         }
2168     }
2169
2170     hlist_for_each_entry_safe(entry, next,
2171                   &priv->lec_arp_empty_ones, next) {
2172         if (entry->vcc == vcc) {
2173             lec_arp_clear_vccs(entry);
2174             del_timer(&entry->timer);
2175             hlist_del(&entry->next);
2176             lec_arp_put(entry);
2177         }
2178     }
2179
2180     hlist_for_each_entry_safe(entry, next,
2181                   &priv->lec_no_forward, next) {
2182         if (entry->recv_vcc == vcc) {
2183             lec_arp_clear_vccs(entry);
2184             del_timer(&entry->timer);
2185             hlist_del(&entry->next);
2186             lec_arp_put(entry);
2187         }
2188     }
2189
2190     hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2191         if (entry->recv_vcc == vcc) {
2192             lec_arp_clear_vccs(entry);
2193             /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2194             hlist_del(&entry->next);
2195             lec_arp_put(entry);
2196         }
2197     }
2198
2199     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2200     dump_arp_table(priv);
2201 }
2202
2203 static void
2204 lec_arp_check_empties(struct lec_priv *priv,
2205               struct atm_vcc *vcc, struct sk_buff *skb)
2206 {
2207     unsigned long flags;
2208     struct hlist_node *next;
2209     struct lec_arp_table *entry, *tmp;
2210     struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2211     unsigned char *src = hdr->h_source;
2212
2213     spin_lock_irqsave(&priv->lec_arp_lock, flags);
2214     hlist_for_each_entry_safe(entry, next,
2215                   &priv->lec_arp_empty_ones, next) {
2216         if (vcc == entry->vcc) {
2217             del_timer(&entry->timer);
2218             ether_addr_copy(entry->mac_addr, src);
2219             entry->status = ESI_FORWARD_DIRECT;
2220             entry->last_used = jiffies;
2221             /* We might have got an entry */
2222             tmp = lec_arp_find(priv, src);
2223             if (tmp) {
2224                 lec_arp_remove(priv, tmp);
2225                 lec_arp_put(tmp);
2226             }
2227             hlist_del(&entry->next);
2228             lec_arp_add(priv, entry);
2229             goto out;
2230         }
2231     }
2232     pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2233 out:
2234     spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2235 }
2236
2237 MODULE_LICENSE("GPL");