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0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright (C) B.A.T.M.A.N. contributors:
0003  *
0004  * Matthias Schiffer
0005  */
0006 
0007 #include "netlink.h"
0008 #include "main.h"
0009 
0010 #include <linux/atomic.h>
0011 #include <linux/bitops.h>
0012 #include <linux/bug.h>
0013 #include <linux/byteorder/generic.h>
0014 #include <linux/cache.h>
0015 #include <linux/err.h>
0016 #include <linux/errno.h>
0017 #include <linux/export.h>
0018 #include <linux/genetlink.h>
0019 #include <linux/gfp.h>
0020 #include <linux/if_ether.h>
0021 #include <linux/if_vlan.h>
0022 #include <linux/init.h>
0023 #include <linux/kernel.h>
0024 #include <linux/limits.h>
0025 #include <linux/list.h>
0026 #include <linux/minmax.h>
0027 #include <linux/netdevice.h>
0028 #include <linux/netlink.h>
0029 #include <linux/printk.h>
0030 #include <linux/rtnetlink.h>
0031 #include <linux/skbuff.h>
0032 #include <linux/stddef.h>
0033 #include <linux/types.h>
0034 #include <net/genetlink.h>
0035 #include <net/net_namespace.h>
0036 #include <net/netlink.h>
0037 #include <net/sock.h>
0038 #include <uapi/linux/batadv_packet.h>
0039 #include <uapi/linux/batman_adv.h>
0040 
0041 #include "bat_algo.h"
0042 #include "bridge_loop_avoidance.h"
0043 #include "distributed-arp-table.h"
0044 #include "gateway_client.h"
0045 #include "gateway_common.h"
0046 #include "hard-interface.h"
0047 #include "log.h"
0048 #include "multicast.h"
0049 #include "network-coding.h"
0050 #include "originator.h"
0051 #include "soft-interface.h"
0052 #include "tp_meter.h"
0053 #include "translation-table.h"
0054 
0055 struct genl_family batadv_netlink_family;
0056 
0057 /* multicast groups */
0058 enum batadv_netlink_multicast_groups {
0059     BATADV_NL_MCGRP_CONFIG,
0060     BATADV_NL_MCGRP_TPMETER,
0061 };
0062 
0063 /**
0064  * enum batadv_genl_ops_flags - flags for genl_ops's internal_flags
0065  */
0066 enum batadv_genl_ops_flags {
0067     /**
0068      * @BATADV_FLAG_NEED_MESH: request requires valid soft interface in
0069      *  attribute BATADV_ATTR_MESH_IFINDEX and expects a pointer to it to be
0070      *  saved in info->user_ptr[0]
0071      */
0072     BATADV_FLAG_NEED_MESH = BIT(0),
0073 
0074     /**
0075      * @BATADV_FLAG_NEED_HARDIF: request requires valid hard interface in
0076      *  attribute BATADV_ATTR_HARD_IFINDEX and expects a pointer to it to be
0077      *  saved in info->user_ptr[1]
0078      */
0079     BATADV_FLAG_NEED_HARDIF = BIT(1),
0080 
0081     /**
0082      * @BATADV_FLAG_NEED_VLAN: request requires valid vlan in
0083      *  attribute BATADV_ATTR_VLANID and expects a pointer to it to be
0084      *  saved in info->user_ptr[1]
0085      */
0086     BATADV_FLAG_NEED_VLAN = BIT(2),
0087 };
0088 
0089 static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
0090     [BATADV_NL_MCGRP_CONFIG] = { .name = BATADV_NL_MCAST_GROUP_CONFIG },
0091     [BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
0092 };
0093 
0094 static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
0095     [BATADV_ATTR_VERSION]           = { .type = NLA_STRING },
0096     [BATADV_ATTR_ALGO_NAME]         = { .type = NLA_STRING },
0097     [BATADV_ATTR_MESH_IFINDEX]      = { .type = NLA_U32 },
0098     [BATADV_ATTR_MESH_IFNAME]       = { .type = NLA_STRING },
0099     [BATADV_ATTR_MESH_ADDRESS]      = { .len = ETH_ALEN },
0100     [BATADV_ATTR_HARD_IFINDEX]      = { .type = NLA_U32 },
0101     [BATADV_ATTR_HARD_IFNAME]       = { .type = NLA_STRING },
0102     [BATADV_ATTR_HARD_ADDRESS]      = { .len = ETH_ALEN },
0103     [BATADV_ATTR_ORIG_ADDRESS]      = { .len = ETH_ALEN },
0104     [BATADV_ATTR_TPMETER_RESULT]        = { .type = NLA_U8 },
0105     [BATADV_ATTR_TPMETER_TEST_TIME]     = { .type = NLA_U32 },
0106     [BATADV_ATTR_TPMETER_BYTES]     = { .type = NLA_U64 },
0107     [BATADV_ATTR_TPMETER_COOKIE]        = { .type = NLA_U32 },
0108     [BATADV_ATTR_ACTIVE]            = { .type = NLA_FLAG },
0109     [BATADV_ATTR_TT_ADDRESS]        = { .len = ETH_ALEN },
0110     [BATADV_ATTR_TT_TTVN]           = { .type = NLA_U8 },
0111     [BATADV_ATTR_TT_LAST_TTVN]      = { .type = NLA_U8 },
0112     [BATADV_ATTR_TT_CRC32]          = { .type = NLA_U32 },
0113     [BATADV_ATTR_TT_VID]            = { .type = NLA_U16 },
0114     [BATADV_ATTR_TT_FLAGS]          = { .type = NLA_U32 },
0115     [BATADV_ATTR_FLAG_BEST]         = { .type = NLA_FLAG },
0116     [BATADV_ATTR_LAST_SEEN_MSECS]       = { .type = NLA_U32 },
0117     [BATADV_ATTR_NEIGH_ADDRESS]     = { .len = ETH_ALEN },
0118     [BATADV_ATTR_TQ]            = { .type = NLA_U8 },
0119     [BATADV_ATTR_THROUGHPUT]        = { .type = NLA_U32 },
0120     [BATADV_ATTR_BANDWIDTH_UP]      = { .type = NLA_U32 },
0121     [BATADV_ATTR_BANDWIDTH_DOWN]        = { .type = NLA_U32 },
0122     [BATADV_ATTR_ROUTER]            = { .len = ETH_ALEN },
0123     [BATADV_ATTR_BLA_OWN]           = { .type = NLA_FLAG },
0124     [BATADV_ATTR_BLA_ADDRESS]       = { .len = ETH_ALEN },
0125     [BATADV_ATTR_BLA_VID]           = { .type = NLA_U16 },
0126     [BATADV_ATTR_BLA_BACKBONE]      = { .len = ETH_ALEN },
0127     [BATADV_ATTR_BLA_CRC]           = { .type = NLA_U16 },
0128     [BATADV_ATTR_DAT_CACHE_IP4ADDRESS]  = { .type = NLA_U32 },
0129     [BATADV_ATTR_DAT_CACHE_HWADDRESS]   = { .len = ETH_ALEN },
0130     [BATADV_ATTR_DAT_CACHE_VID]     = { .type = NLA_U16 },
0131     [BATADV_ATTR_MCAST_FLAGS]       = { .type = NLA_U32 },
0132     [BATADV_ATTR_MCAST_FLAGS_PRIV]      = { .type = NLA_U32 },
0133     [BATADV_ATTR_VLANID]            = { .type = NLA_U16 },
0134     [BATADV_ATTR_AGGREGATED_OGMS_ENABLED]   = { .type = NLA_U8 },
0135     [BATADV_ATTR_AP_ISOLATION_ENABLED]  = { .type = NLA_U8 },
0136     [BATADV_ATTR_ISOLATION_MARK]        = { .type = NLA_U32 },
0137     [BATADV_ATTR_ISOLATION_MASK]        = { .type = NLA_U32 },
0138     [BATADV_ATTR_BONDING_ENABLED]       = { .type = NLA_U8 },
0139     [BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED] = { .type = NLA_U8 },
0140     [BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED] = { .type = NLA_U8 },
0141     [BATADV_ATTR_FRAGMENTATION_ENABLED] = { .type = NLA_U8 },
0142     [BATADV_ATTR_GW_BANDWIDTH_DOWN]     = { .type = NLA_U32 },
0143     [BATADV_ATTR_GW_BANDWIDTH_UP]       = { .type = NLA_U32 },
0144     [BATADV_ATTR_GW_MODE]           = { .type = NLA_U8 },
0145     [BATADV_ATTR_GW_SEL_CLASS]      = { .type = NLA_U32 },
0146     [BATADV_ATTR_HOP_PENALTY]       = { .type = NLA_U8 },
0147     [BATADV_ATTR_LOG_LEVEL]         = { .type = NLA_U32 },
0148     [BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]  = { .type = NLA_U8 },
0149     [BATADV_ATTR_MULTICAST_FANOUT]      = { .type = NLA_U32 },
0150     [BATADV_ATTR_NETWORK_CODING_ENABLED]    = { .type = NLA_U8 },
0151     [BATADV_ATTR_ORIG_INTERVAL]     = { .type = NLA_U32 },
0152     [BATADV_ATTR_ELP_INTERVAL]      = { .type = NLA_U32 },
0153     [BATADV_ATTR_THROUGHPUT_OVERRIDE]   = { .type = NLA_U32 },
0154 };
0155 
0156 /**
0157  * batadv_netlink_get_ifindex() - Extract an interface index from a message
0158  * @nlh: Message header
0159  * @attrtype: Attribute which holds an interface index
0160  *
0161  * Return: interface index, or 0.
0162  */
0163 int
0164 batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
0165 {
0166     struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
0167 
0168     return (attr && nla_len(attr) == sizeof(u32)) ? nla_get_u32(attr) : 0;
0169 }
0170 
0171 /**
0172  * batadv_netlink_mesh_fill_ap_isolation() - Add ap_isolation softif attribute
0173  * @msg: Netlink message to dump into
0174  * @bat_priv: the bat priv with all the soft interface information
0175  *
0176  * Return: 0 on success or negative error number in case of failure
0177  */
0178 static int batadv_netlink_mesh_fill_ap_isolation(struct sk_buff *msg,
0179                          struct batadv_priv *bat_priv)
0180 {
0181     struct batadv_softif_vlan *vlan;
0182     u8 ap_isolation;
0183 
0184     vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
0185     if (!vlan)
0186         return 0;
0187 
0188     ap_isolation = atomic_read(&vlan->ap_isolation);
0189     batadv_softif_vlan_put(vlan);
0190 
0191     return nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
0192               !!ap_isolation);
0193 }
0194 
0195 /**
0196  * batadv_netlink_set_mesh_ap_isolation() - Set ap_isolation from genl msg
0197  * @attr: parsed BATADV_ATTR_AP_ISOLATION_ENABLED attribute
0198  * @bat_priv: the bat priv with all the soft interface information
0199  *
0200  * Return: 0 on success or negative error number in case of failure
0201  */
0202 static int batadv_netlink_set_mesh_ap_isolation(struct nlattr *attr,
0203                         struct batadv_priv *bat_priv)
0204 {
0205     struct batadv_softif_vlan *vlan;
0206 
0207     vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
0208     if (!vlan)
0209         return -ENOENT;
0210 
0211     atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
0212     batadv_softif_vlan_put(vlan);
0213 
0214     return 0;
0215 }
0216 
0217 /**
0218  * batadv_netlink_mesh_fill() - Fill message with mesh attributes
0219  * @msg: Netlink message to dump into
0220  * @bat_priv: the bat priv with all the soft interface information
0221  * @cmd: type of message to generate
0222  * @portid: Port making netlink request
0223  * @seq: sequence number for message
0224  * @flags: Additional flags for message
0225  *
0226  * Return: 0 on success or negative error number in case of failure
0227  */
0228 static int batadv_netlink_mesh_fill(struct sk_buff *msg,
0229                     struct batadv_priv *bat_priv,
0230                     enum batadv_nl_commands cmd,
0231                     u32 portid, u32 seq, int flags)
0232 {
0233     struct net_device *soft_iface = bat_priv->soft_iface;
0234     struct batadv_hard_iface *primary_if = NULL;
0235     struct net_device *hard_iface;
0236     void *hdr;
0237 
0238     hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
0239     if (!hdr)
0240         return -ENOBUFS;
0241 
0242     if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) ||
0243         nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
0244                bat_priv->algo_ops->name) ||
0245         nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) ||
0246         nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) ||
0247         nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
0248             soft_iface->dev_addr) ||
0249         nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
0250                (u8)atomic_read(&bat_priv->tt.vn)))
0251         goto nla_put_failure;
0252 
0253 #ifdef CONFIG_BATMAN_ADV_BLA
0254     if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
0255             ntohs(bat_priv->bla.claim_dest.group)))
0256         goto nla_put_failure;
0257 #endif
0258 
0259     if (batadv_mcast_mesh_info_put(msg, bat_priv))
0260         goto nla_put_failure;
0261 
0262     primary_if = batadv_primary_if_get_selected(bat_priv);
0263     if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
0264         hard_iface = primary_if->net_dev;
0265 
0266         if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
0267                 hard_iface->ifindex) ||
0268             nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
0269                    hard_iface->name) ||
0270             nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
0271                 hard_iface->dev_addr))
0272             goto nla_put_failure;
0273     }
0274 
0275     if (nla_put_u8(msg, BATADV_ATTR_AGGREGATED_OGMS_ENABLED,
0276                !!atomic_read(&bat_priv->aggregated_ogms)))
0277         goto nla_put_failure;
0278 
0279     if (batadv_netlink_mesh_fill_ap_isolation(msg, bat_priv))
0280         goto nla_put_failure;
0281 
0282     if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MARK,
0283             bat_priv->isolation_mark))
0284         goto nla_put_failure;
0285 
0286     if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MASK,
0287             bat_priv->isolation_mark_mask))
0288         goto nla_put_failure;
0289 
0290     if (nla_put_u8(msg, BATADV_ATTR_BONDING_ENABLED,
0291                !!atomic_read(&bat_priv->bonding)))
0292         goto nla_put_failure;
0293 
0294 #ifdef CONFIG_BATMAN_ADV_BLA
0295     if (nla_put_u8(msg, BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED,
0296                !!atomic_read(&bat_priv->bridge_loop_avoidance)))
0297         goto nla_put_failure;
0298 #endif /* CONFIG_BATMAN_ADV_BLA */
0299 
0300 #ifdef CONFIG_BATMAN_ADV_DAT
0301     if (nla_put_u8(msg, BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED,
0302                !!atomic_read(&bat_priv->distributed_arp_table)))
0303         goto nla_put_failure;
0304 #endif /* CONFIG_BATMAN_ADV_DAT */
0305 
0306     if (nla_put_u8(msg, BATADV_ATTR_FRAGMENTATION_ENABLED,
0307                !!atomic_read(&bat_priv->fragmentation)))
0308         goto nla_put_failure;
0309 
0310     if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_DOWN,
0311             atomic_read(&bat_priv->gw.bandwidth_down)))
0312         goto nla_put_failure;
0313 
0314     if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_UP,
0315             atomic_read(&bat_priv->gw.bandwidth_up)))
0316         goto nla_put_failure;
0317 
0318     if (nla_put_u8(msg, BATADV_ATTR_GW_MODE,
0319                atomic_read(&bat_priv->gw.mode)))
0320         goto nla_put_failure;
0321 
0322     if (bat_priv->algo_ops->gw.get_best_gw_node &&
0323         bat_priv->algo_ops->gw.is_eligible) {
0324         /* GW selection class is not available if the routing algorithm
0325          * in use does not implement the GW API
0326          */
0327         if (nla_put_u32(msg, BATADV_ATTR_GW_SEL_CLASS,
0328                 atomic_read(&bat_priv->gw.sel_class)))
0329             goto nla_put_failure;
0330     }
0331 
0332     if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
0333                atomic_read(&bat_priv->hop_penalty)))
0334         goto nla_put_failure;
0335 
0336 #ifdef CONFIG_BATMAN_ADV_DEBUG
0337     if (nla_put_u32(msg, BATADV_ATTR_LOG_LEVEL,
0338             atomic_read(&bat_priv->log_level)))
0339         goto nla_put_failure;
0340 #endif /* CONFIG_BATMAN_ADV_DEBUG */
0341 
0342 #ifdef CONFIG_BATMAN_ADV_MCAST
0343     if (nla_put_u8(msg, BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED,
0344                !atomic_read(&bat_priv->multicast_mode)))
0345         goto nla_put_failure;
0346 
0347     if (nla_put_u32(msg, BATADV_ATTR_MULTICAST_FANOUT,
0348             atomic_read(&bat_priv->multicast_fanout)))
0349         goto nla_put_failure;
0350 #endif /* CONFIG_BATMAN_ADV_MCAST */
0351 
0352 #ifdef CONFIG_BATMAN_ADV_NC
0353     if (nla_put_u8(msg, BATADV_ATTR_NETWORK_CODING_ENABLED,
0354                !!atomic_read(&bat_priv->network_coding)))
0355         goto nla_put_failure;
0356 #endif /* CONFIG_BATMAN_ADV_NC */
0357 
0358     if (nla_put_u32(msg, BATADV_ATTR_ORIG_INTERVAL,
0359             atomic_read(&bat_priv->orig_interval)))
0360         goto nla_put_failure;
0361 
0362     batadv_hardif_put(primary_if);
0363 
0364     genlmsg_end(msg, hdr);
0365     return 0;
0366 
0367 nla_put_failure:
0368     batadv_hardif_put(primary_if);
0369 
0370     genlmsg_cancel(msg, hdr);
0371     return -EMSGSIZE;
0372 }
0373 
0374 /**
0375  * batadv_netlink_notify_mesh() - send softif attributes to listener
0376  * @bat_priv: the bat priv with all the soft interface information
0377  *
0378  * Return: 0 on success, < 0 on error
0379  */
0380 int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv)
0381 {
0382     struct sk_buff *msg;
0383     int ret;
0384 
0385     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
0386     if (!msg)
0387         return -ENOMEM;
0388 
0389     ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_SET_MESH,
0390                        0, 0, 0);
0391     if (ret < 0) {
0392         nlmsg_free(msg);
0393         return ret;
0394     }
0395 
0396     genlmsg_multicast_netns(&batadv_netlink_family,
0397                 dev_net(bat_priv->soft_iface), msg, 0,
0398                 BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
0399 
0400     return 0;
0401 }
0402 
0403 /**
0404  * batadv_netlink_get_mesh() - Get softif attributes
0405  * @skb: Netlink message with request data
0406  * @info: receiver information
0407  *
0408  * Return: 0 on success or negative error number in case of failure
0409  */
0410 static int batadv_netlink_get_mesh(struct sk_buff *skb, struct genl_info *info)
0411 {
0412     struct batadv_priv *bat_priv = info->user_ptr[0];
0413     struct sk_buff *msg;
0414     int ret;
0415 
0416     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
0417     if (!msg)
0418         return -ENOMEM;
0419 
0420     ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_GET_MESH,
0421                        info->snd_portid, info->snd_seq, 0);
0422     if (ret < 0) {
0423         nlmsg_free(msg);
0424         return ret;
0425     }
0426 
0427     ret = genlmsg_reply(msg, info);
0428 
0429     return ret;
0430 }
0431 
0432 /**
0433  * batadv_netlink_set_mesh() - Set softif attributes
0434  * @skb: Netlink message with request data
0435  * @info: receiver information
0436  *
0437  * Return: 0 on success or negative error number in case of failure
0438  */
0439 static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info)
0440 {
0441     struct batadv_priv *bat_priv = info->user_ptr[0];
0442     struct nlattr *attr;
0443 
0444     if (info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED]) {
0445         attr = info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED];
0446 
0447         atomic_set(&bat_priv->aggregated_ogms, !!nla_get_u8(attr));
0448     }
0449 
0450     if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
0451         attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
0452 
0453         batadv_netlink_set_mesh_ap_isolation(attr, bat_priv);
0454     }
0455 
0456     if (info->attrs[BATADV_ATTR_ISOLATION_MARK]) {
0457         attr = info->attrs[BATADV_ATTR_ISOLATION_MARK];
0458 
0459         bat_priv->isolation_mark = nla_get_u32(attr);
0460     }
0461 
0462     if (info->attrs[BATADV_ATTR_ISOLATION_MASK]) {
0463         attr = info->attrs[BATADV_ATTR_ISOLATION_MASK];
0464 
0465         bat_priv->isolation_mark_mask = nla_get_u32(attr);
0466     }
0467 
0468     if (info->attrs[BATADV_ATTR_BONDING_ENABLED]) {
0469         attr = info->attrs[BATADV_ATTR_BONDING_ENABLED];
0470 
0471         atomic_set(&bat_priv->bonding, !!nla_get_u8(attr));
0472     }
0473 
0474 #ifdef CONFIG_BATMAN_ADV_BLA
0475     if (info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]) {
0476         attr = info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED];
0477 
0478         atomic_set(&bat_priv->bridge_loop_avoidance,
0479                !!nla_get_u8(attr));
0480         batadv_bla_status_update(bat_priv->soft_iface);
0481     }
0482 #endif /* CONFIG_BATMAN_ADV_BLA */
0483 
0484 #ifdef CONFIG_BATMAN_ADV_DAT
0485     if (info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]) {
0486         attr = info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED];
0487 
0488         atomic_set(&bat_priv->distributed_arp_table,
0489                !!nla_get_u8(attr));
0490         batadv_dat_status_update(bat_priv->soft_iface);
0491     }
0492 #endif /* CONFIG_BATMAN_ADV_DAT */
0493 
0494     if (info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED]) {
0495         attr = info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED];
0496 
0497         atomic_set(&bat_priv->fragmentation, !!nla_get_u8(attr));
0498         batadv_update_min_mtu(bat_priv->soft_iface);
0499     }
0500 
0501     if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]) {
0502         attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN];
0503 
0504         atomic_set(&bat_priv->gw.bandwidth_down, nla_get_u32(attr));
0505         batadv_gw_tvlv_container_update(bat_priv);
0506     }
0507 
0508     if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP]) {
0509         attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP];
0510 
0511         atomic_set(&bat_priv->gw.bandwidth_up, nla_get_u32(attr));
0512         batadv_gw_tvlv_container_update(bat_priv);
0513     }
0514 
0515     if (info->attrs[BATADV_ATTR_GW_MODE]) {
0516         u8 gw_mode;
0517 
0518         attr = info->attrs[BATADV_ATTR_GW_MODE];
0519         gw_mode = nla_get_u8(attr);
0520 
0521         if (gw_mode <= BATADV_GW_MODE_SERVER) {
0522             /* Invoking batadv_gw_reselect() is not enough to really
0523              * de-select the current GW. It will only instruct the
0524              * gateway client code to perform a re-election the next
0525              * time that this is needed.
0526              *
0527              * When gw client mode is being switched off the current
0528              * GW must be de-selected explicitly otherwise no GW_ADD
0529              * uevent is thrown on client mode re-activation. This
0530              * is operation is performed in
0531              * batadv_gw_check_client_stop().
0532              */
0533             batadv_gw_reselect(bat_priv);
0534 
0535             /* always call batadv_gw_check_client_stop() before
0536              * changing the gateway state
0537              */
0538             batadv_gw_check_client_stop(bat_priv);
0539             atomic_set(&bat_priv->gw.mode, gw_mode);
0540             batadv_gw_tvlv_container_update(bat_priv);
0541         }
0542     }
0543 
0544     if (info->attrs[BATADV_ATTR_GW_SEL_CLASS] &&
0545         bat_priv->algo_ops->gw.get_best_gw_node &&
0546         bat_priv->algo_ops->gw.is_eligible) {
0547         /* setting the GW selection class is allowed only if the routing
0548          * algorithm in use implements the GW API
0549          */
0550 
0551         u32 sel_class_max = 0xffffffffu;
0552         u32 sel_class;
0553 
0554         attr = info->attrs[BATADV_ATTR_GW_SEL_CLASS];
0555         sel_class = nla_get_u32(attr);
0556 
0557         if (!bat_priv->algo_ops->gw.store_sel_class)
0558             sel_class_max = BATADV_TQ_MAX_VALUE;
0559 
0560         if (sel_class >= 1 && sel_class <= sel_class_max) {
0561             atomic_set(&bat_priv->gw.sel_class, sel_class);
0562             batadv_gw_reselect(bat_priv);
0563         }
0564     }
0565 
0566     if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
0567         attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
0568 
0569         atomic_set(&bat_priv->hop_penalty, nla_get_u8(attr));
0570     }
0571 
0572 #ifdef CONFIG_BATMAN_ADV_DEBUG
0573     if (info->attrs[BATADV_ATTR_LOG_LEVEL]) {
0574         attr = info->attrs[BATADV_ATTR_LOG_LEVEL];
0575 
0576         atomic_set(&bat_priv->log_level,
0577                nla_get_u32(attr) & BATADV_DBG_ALL);
0578     }
0579 #endif /* CONFIG_BATMAN_ADV_DEBUG */
0580 
0581 #ifdef CONFIG_BATMAN_ADV_MCAST
0582     if (info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]) {
0583         attr = info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED];
0584 
0585         atomic_set(&bat_priv->multicast_mode, !nla_get_u8(attr));
0586     }
0587 
0588     if (info->attrs[BATADV_ATTR_MULTICAST_FANOUT]) {
0589         attr = info->attrs[BATADV_ATTR_MULTICAST_FANOUT];
0590 
0591         atomic_set(&bat_priv->multicast_fanout, nla_get_u32(attr));
0592     }
0593 #endif /* CONFIG_BATMAN_ADV_MCAST */
0594 
0595 #ifdef CONFIG_BATMAN_ADV_NC
0596     if (info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]) {
0597         attr = info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED];
0598 
0599         atomic_set(&bat_priv->network_coding, !!nla_get_u8(attr));
0600         batadv_nc_status_update(bat_priv->soft_iface);
0601     }
0602 #endif /* CONFIG_BATMAN_ADV_NC */
0603 
0604     if (info->attrs[BATADV_ATTR_ORIG_INTERVAL]) {
0605         u32 orig_interval;
0606 
0607         attr = info->attrs[BATADV_ATTR_ORIG_INTERVAL];
0608         orig_interval = nla_get_u32(attr);
0609 
0610         orig_interval = min_t(u32, orig_interval, INT_MAX);
0611         orig_interval = max_t(u32, orig_interval, 2 * BATADV_JITTER);
0612 
0613         atomic_set(&bat_priv->orig_interval, orig_interval);
0614     }
0615 
0616     batadv_netlink_notify_mesh(bat_priv);
0617 
0618     return 0;
0619 }
0620 
0621 /**
0622  * batadv_netlink_tp_meter_put() - Fill information of started tp_meter session
0623  * @msg: netlink message to be sent back
0624  * @cookie: tp meter session cookie
0625  *
0626  *  Return: 0 on success, < 0 on error
0627  */
0628 static int
0629 batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
0630 {
0631     if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
0632         return -ENOBUFS;
0633 
0634     return 0;
0635 }
0636 
0637 /**
0638  * batadv_netlink_tpmeter_notify() - send tp_meter result via netlink to client
0639  * @bat_priv: the bat priv with all the soft interface information
0640  * @dst: destination of tp_meter session
0641  * @result: reason for tp meter session stop
0642  * @test_time: total time of the tp_meter session
0643  * @total_bytes: bytes acked to the receiver
0644  * @cookie: cookie of tp_meter session
0645  *
0646  * Return: 0 on success, < 0 on error
0647  */
0648 int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
0649                   u8 result, u32 test_time, u64 total_bytes,
0650                   u32 cookie)
0651 {
0652     struct sk_buff *msg;
0653     void *hdr;
0654     int ret;
0655 
0656     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
0657     if (!msg)
0658         return -ENOMEM;
0659 
0660     hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
0661               BATADV_CMD_TP_METER);
0662     if (!hdr) {
0663         ret = -ENOBUFS;
0664         goto err_genlmsg;
0665     }
0666 
0667     if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
0668         goto nla_put_failure;
0669 
0670     if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
0671         goto nla_put_failure;
0672 
0673     if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
0674                   BATADV_ATTR_PAD))
0675         goto nla_put_failure;
0676 
0677     if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
0678         goto nla_put_failure;
0679 
0680     if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
0681         goto nla_put_failure;
0682 
0683     genlmsg_end(msg, hdr);
0684 
0685     genlmsg_multicast_netns(&batadv_netlink_family,
0686                 dev_net(bat_priv->soft_iface), msg, 0,
0687                 BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
0688 
0689     return 0;
0690 
0691 nla_put_failure:
0692     genlmsg_cancel(msg, hdr);
0693     ret = -EMSGSIZE;
0694 
0695 err_genlmsg:
0696     nlmsg_free(msg);
0697     return ret;
0698 }
0699 
0700 /**
0701  * batadv_netlink_tp_meter_start() - Start a new tp_meter session
0702  * @skb: received netlink message
0703  * @info: receiver information
0704  *
0705  * Return: 0 on success, < 0 on error
0706  */
0707 static int
0708 batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info)
0709 {
0710     struct batadv_priv *bat_priv = info->user_ptr[0];
0711     struct sk_buff *msg = NULL;
0712     u32 test_length;
0713     void *msg_head;
0714     u32 cookie;
0715     u8 *dst;
0716     int ret;
0717 
0718     if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
0719         return -EINVAL;
0720 
0721     if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
0722         return -EINVAL;
0723 
0724     dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
0725 
0726     test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
0727 
0728     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
0729     if (!msg) {
0730         ret = -ENOMEM;
0731         goto out;
0732     }
0733 
0734     msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
0735                    &batadv_netlink_family, 0,
0736                    BATADV_CMD_TP_METER);
0737     if (!msg_head) {
0738         ret = -ENOBUFS;
0739         goto out;
0740     }
0741 
0742     batadv_tp_start(bat_priv, dst, test_length, &cookie);
0743 
0744     ret = batadv_netlink_tp_meter_put(msg, cookie);
0745 
0746  out:
0747     if (ret) {
0748         if (msg)
0749             nlmsg_free(msg);
0750         return ret;
0751     }
0752 
0753     genlmsg_end(msg, msg_head);
0754     return genlmsg_reply(msg, info);
0755 }
0756 
0757 /**
0758  * batadv_netlink_tp_meter_cancel() - Cancel a running tp_meter session
0759  * @skb: received netlink message
0760  * @info: receiver information
0761  *
0762  * Return: 0 on success, < 0 on error
0763  */
0764 static int
0765 batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
0766 {
0767     struct batadv_priv *bat_priv = info->user_ptr[0];
0768     u8 *dst;
0769     int ret = 0;
0770 
0771     if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
0772         return -EINVAL;
0773 
0774     dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
0775 
0776     batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
0777 
0778     return ret;
0779 }
0780 
0781 /**
0782  * batadv_netlink_hardif_fill() - Fill message with hardif attributes
0783  * @msg: Netlink message to dump into
0784  * @bat_priv: the bat priv with all the soft interface information
0785  * @hard_iface: hard interface which was modified
0786  * @cmd: type of message to generate
0787  * @portid: Port making netlink request
0788  * @seq: sequence number for message
0789  * @flags: Additional flags for message
0790  * @cb: Control block containing additional options
0791  *
0792  * Return: 0 on success or negative error number in case of failure
0793  */
0794 static int batadv_netlink_hardif_fill(struct sk_buff *msg,
0795                       struct batadv_priv *bat_priv,
0796                       struct batadv_hard_iface *hard_iface,
0797                       enum batadv_nl_commands cmd,
0798                       u32 portid, u32 seq, int flags,
0799                       struct netlink_callback *cb)
0800 {
0801     struct net_device *net_dev = hard_iface->net_dev;
0802     void *hdr;
0803 
0804     hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
0805     if (!hdr)
0806         return -ENOBUFS;
0807 
0808     if (cb)
0809         genl_dump_check_consistent(cb, hdr);
0810 
0811     if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
0812             bat_priv->soft_iface->ifindex))
0813         goto nla_put_failure;
0814 
0815     if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
0816                bat_priv->soft_iface->name))
0817         goto nla_put_failure;
0818 
0819     if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
0820             net_dev->ifindex) ||
0821         nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
0822                net_dev->name) ||
0823         nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
0824             net_dev->dev_addr))
0825         goto nla_put_failure;
0826 
0827     if (hard_iface->if_status == BATADV_IF_ACTIVE) {
0828         if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
0829             goto nla_put_failure;
0830     }
0831 
0832     if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
0833                atomic_read(&hard_iface->hop_penalty)))
0834         goto nla_put_failure;
0835 
0836 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
0837     if (nla_put_u32(msg, BATADV_ATTR_ELP_INTERVAL,
0838             atomic_read(&hard_iface->bat_v.elp_interval)))
0839         goto nla_put_failure;
0840 
0841     if (nla_put_u32(msg, BATADV_ATTR_THROUGHPUT_OVERRIDE,
0842             atomic_read(&hard_iface->bat_v.throughput_override)))
0843         goto nla_put_failure;
0844 #endif /* CONFIG_BATMAN_ADV_BATMAN_V */
0845 
0846     genlmsg_end(msg, hdr);
0847     return 0;
0848 
0849 nla_put_failure:
0850     genlmsg_cancel(msg, hdr);
0851     return -EMSGSIZE;
0852 }
0853 
0854 /**
0855  * batadv_netlink_notify_hardif() - send hardif attributes to listener
0856  * @bat_priv: the bat priv with all the soft interface information
0857  * @hard_iface: hard interface which was modified
0858  *
0859  * Return: 0 on success, < 0 on error
0860  */
0861 int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv,
0862                  struct batadv_hard_iface *hard_iface)
0863 {
0864     struct sk_buff *msg;
0865     int ret;
0866 
0867     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
0868     if (!msg)
0869         return -ENOMEM;
0870 
0871     ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
0872                      BATADV_CMD_SET_HARDIF, 0, 0, 0, NULL);
0873     if (ret < 0) {
0874         nlmsg_free(msg);
0875         return ret;
0876     }
0877 
0878     genlmsg_multicast_netns(&batadv_netlink_family,
0879                 dev_net(bat_priv->soft_iface), msg, 0,
0880                 BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
0881 
0882     return 0;
0883 }
0884 
0885 /**
0886  * batadv_netlink_get_hardif() - Get hardif attributes
0887  * @skb: Netlink message with request data
0888  * @info: receiver information
0889  *
0890  * Return: 0 on success or negative error number in case of failure
0891  */
0892 static int batadv_netlink_get_hardif(struct sk_buff *skb,
0893                      struct genl_info *info)
0894 {
0895     struct batadv_hard_iface *hard_iface = info->user_ptr[1];
0896     struct batadv_priv *bat_priv = info->user_ptr[0];
0897     struct sk_buff *msg;
0898     int ret;
0899 
0900     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
0901     if (!msg)
0902         return -ENOMEM;
0903 
0904     ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
0905                      BATADV_CMD_GET_HARDIF,
0906                      info->snd_portid, info->snd_seq, 0,
0907                      NULL);
0908     if (ret < 0) {
0909         nlmsg_free(msg);
0910         return ret;
0911     }
0912 
0913     ret = genlmsg_reply(msg, info);
0914 
0915     return ret;
0916 }
0917 
0918 /**
0919  * batadv_netlink_set_hardif() - Set hardif attributes
0920  * @skb: Netlink message with request data
0921  * @info: receiver information
0922  *
0923  * Return: 0 on success or negative error number in case of failure
0924  */
0925 static int batadv_netlink_set_hardif(struct sk_buff *skb,
0926                      struct genl_info *info)
0927 {
0928     struct batadv_hard_iface *hard_iface = info->user_ptr[1];
0929     struct batadv_priv *bat_priv = info->user_ptr[0];
0930     struct nlattr *attr;
0931 
0932     if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
0933         attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
0934 
0935         atomic_set(&hard_iface->hop_penalty, nla_get_u8(attr));
0936     }
0937 
0938 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
0939 
0940     if (info->attrs[BATADV_ATTR_ELP_INTERVAL]) {
0941         attr = info->attrs[BATADV_ATTR_ELP_INTERVAL];
0942 
0943         atomic_set(&hard_iface->bat_v.elp_interval, nla_get_u32(attr));
0944     }
0945 
0946     if (info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE]) {
0947         attr = info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE];
0948 
0949         atomic_set(&hard_iface->bat_v.throughput_override,
0950                nla_get_u32(attr));
0951     }
0952 #endif /* CONFIG_BATMAN_ADV_BATMAN_V */
0953 
0954     batadv_netlink_notify_hardif(bat_priv, hard_iface);
0955 
0956     return 0;
0957 }
0958 
0959 /**
0960  * batadv_netlink_dump_hardif() - Dump all hard interface into a messages
0961  * @msg: Netlink message to dump into
0962  * @cb: Parameters from query
0963  *
0964  * Return: error code, or length of reply message on success
0965  */
0966 static int
0967 batadv_netlink_dump_hardif(struct sk_buff *msg, struct netlink_callback *cb)
0968 {
0969     struct net *net = sock_net(cb->skb->sk);
0970     struct net_device *soft_iface;
0971     struct batadv_hard_iface *hard_iface;
0972     struct batadv_priv *bat_priv;
0973     int ifindex;
0974     int portid = NETLINK_CB(cb->skb).portid;
0975     int skip = cb->args[0];
0976     int i = 0;
0977 
0978     ifindex = batadv_netlink_get_ifindex(cb->nlh,
0979                          BATADV_ATTR_MESH_IFINDEX);
0980     if (!ifindex)
0981         return -EINVAL;
0982 
0983     soft_iface = dev_get_by_index(net, ifindex);
0984     if (!soft_iface)
0985         return -ENODEV;
0986 
0987     if (!batadv_softif_is_valid(soft_iface)) {
0988         dev_put(soft_iface);
0989         return -ENODEV;
0990     }
0991 
0992     bat_priv = netdev_priv(soft_iface);
0993 
0994     rtnl_lock();
0995     cb->seq = batadv_hardif_generation << 1 | 1;
0996 
0997     list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
0998         if (hard_iface->soft_iface != soft_iface)
0999             continue;
1000 
1001         if (i++ < skip)
1002             continue;
1003 
1004         if (batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
1005                            BATADV_CMD_GET_HARDIF,
1006                            portid, cb->nlh->nlmsg_seq,
1007                            NLM_F_MULTI, cb)) {
1008             i--;
1009             break;
1010         }
1011     }
1012 
1013     rtnl_unlock();
1014 
1015     dev_put(soft_iface);
1016 
1017     cb->args[0] = i;
1018 
1019     return msg->len;
1020 }
1021 
1022 /**
1023  * batadv_netlink_vlan_fill() - Fill message with vlan attributes
1024  * @msg: Netlink message to dump into
1025  * @bat_priv: the bat priv with all the soft interface information
1026  * @vlan: vlan which was modified
1027  * @cmd: type of message to generate
1028  * @portid: Port making netlink request
1029  * @seq: sequence number for message
1030  * @flags: Additional flags for message
1031  *
1032  * Return: 0 on success or negative error number in case of failure
1033  */
1034 static int batadv_netlink_vlan_fill(struct sk_buff *msg,
1035                     struct batadv_priv *bat_priv,
1036                     struct batadv_softif_vlan *vlan,
1037                     enum batadv_nl_commands cmd,
1038                     u32 portid, u32 seq, int flags)
1039 {
1040     void *hdr;
1041 
1042     hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
1043     if (!hdr)
1044         return -ENOBUFS;
1045 
1046     if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
1047             bat_priv->soft_iface->ifindex))
1048         goto nla_put_failure;
1049 
1050     if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
1051                bat_priv->soft_iface->name))
1052         goto nla_put_failure;
1053 
1054     if (nla_put_u32(msg, BATADV_ATTR_VLANID, vlan->vid & VLAN_VID_MASK))
1055         goto nla_put_failure;
1056 
1057     if (nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
1058                !!atomic_read(&vlan->ap_isolation)))
1059         goto nla_put_failure;
1060 
1061     genlmsg_end(msg, hdr);
1062     return 0;
1063 
1064 nla_put_failure:
1065     genlmsg_cancel(msg, hdr);
1066     return -EMSGSIZE;
1067 }
1068 
1069 /**
1070  * batadv_netlink_notify_vlan() - send vlan attributes to listener
1071  * @bat_priv: the bat priv with all the soft interface information
1072  * @vlan: vlan which was modified
1073  *
1074  * Return: 0 on success, < 0 on error
1075  */
1076 int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
1077                    struct batadv_softif_vlan *vlan)
1078 {
1079     struct sk_buff *msg;
1080     int ret;
1081 
1082     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1083     if (!msg)
1084         return -ENOMEM;
1085 
1086     ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan,
1087                        BATADV_CMD_SET_VLAN, 0, 0, 0);
1088     if (ret < 0) {
1089         nlmsg_free(msg);
1090         return ret;
1091     }
1092 
1093     genlmsg_multicast_netns(&batadv_netlink_family,
1094                 dev_net(bat_priv->soft_iface), msg, 0,
1095                 BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
1096 
1097     return 0;
1098 }
1099 
1100 /**
1101  * batadv_netlink_get_vlan() - Get vlan attributes
1102  * @skb: Netlink message with request data
1103  * @info: receiver information
1104  *
1105  * Return: 0 on success or negative error number in case of failure
1106  */
1107 static int batadv_netlink_get_vlan(struct sk_buff *skb, struct genl_info *info)
1108 {
1109     struct batadv_softif_vlan *vlan = info->user_ptr[1];
1110     struct batadv_priv *bat_priv = info->user_ptr[0];
1111     struct sk_buff *msg;
1112     int ret;
1113 
1114     msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1115     if (!msg)
1116         return -ENOMEM;
1117 
1118     ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan, BATADV_CMD_GET_VLAN,
1119                        info->snd_portid, info->snd_seq, 0);
1120     if (ret < 0) {
1121         nlmsg_free(msg);
1122         return ret;
1123     }
1124 
1125     ret = genlmsg_reply(msg, info);
1126 
1127     return ret;
1128 }
1129 
1130 /**
1131  * batadv_netlink_set_vlan() - Get vlan attributes
1132  * @skb: Netlink message with request data
1133  * @info: receiver information
1134  *
1135  * Return: 0 on success or negative error number in case of failure
1136  */
1137 static int batadv_netlink_set_vlan(struct sk_buff *skb, struct genl_info *info)
1138 {
1139     struct batadv_softif_vlan *vlan = info->user_ptr[1];
1140     struct batadv_priv *bat_priv = info->user_ptr[0];
1141     struct nlattr *attr;
1142 
1143     if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
1144         attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
1145 
1146         atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
1147     }
1148 
1149     batadv_netlink_notify_vlan(bat_priv, vlan);
1150 
1151     return 0;
1152 }
1153 
1154 /**
1155  * batadv_get_softif_from_info() - Retrieve soft interface from genl attributes
1156  * @net: the applicable net namespace
1157  * @info: receiver information
1158  *
1159  * Return: Pointer to soft interface (with increased refcnt) on success, error
1160  *  pointer on error
1161  */
1162 static struct net_device *
1163 batadv_get_softif_from_info(struct net *net, struct genl_info *info)
1164 {
1165     struct net_device *soft_iface;
1166     int ifindex;
1167 
1168     if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
1169         return ERR_PTR(-EINVAL);
1170 
1171     ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
1172 
1173     soft_iface = dev_get_by_index(net, ifindex);
1174     if (!soft_iface)
1175         return ERR_PTR(-ENODEV);
1176 
1177     if (!batadv_softif_is_valid(soft_iface))
1178         goto err_put_softif;
1179 
1180     return soft_iface;
1181 
1182 err_put_softif:
1183     dev_put(soft_iface);
1184 
1185     return ERR_PTR(-EINVAL);
1186 }
1187 
1188 /**
1189  * batadv_get_hardif_from_info() - Retrieve hardif from genl attributes
1190  * @bat_priv: the bat priv with all the soft interface information
1191  * @net: the applicable net namespace
1192  * @info: receiver information
1193  *
1194  * Return: Pointer to hard interface (with increased refcnt) on success, error
1195  *  pointer on error
1196  */
1197 static struct batadv_hard_iface *
1198 batadv_get_hardif_from_info(struct batadv_priv *bat_priv, struct net *net,
1199                 struct genl_info *info)
1200 {
1201     struct batadv_hard_iface *hard_iface;
1202     struct net_device *hard_dev;
1203     unsigned int hardif_index;
1204 
1205     if (!info->attrs[BATADV_ATTR_HARD_IFINDEX])
1206         return ERR_PTR(-EINVAL);
1207 
1208     hardif_index = nla_get_u32(info->attrs[BATADV_ATTR_HARD_IFINDEX]);
1209 
1210     hard_dev = dev_get_by_index(net, hardif_index);
1211     if (!hard_dev)
1212         return ERR_PTR(-ENODEV);
1213 
1214     hard_iface = batadv_hardif_get_by_netdev(hard_dev);
1215     if (!hard_iface)
1216         goto err_put_harddev;
1217 
1218     if (hard_iface->soft_iface != bat_priv->soft_iface)
1219         goto err_put_hardif;
1220 
1221     /* hard_dev is referenced by hard_iface and not needed here */
1222     dev_put(hard_dev);
1223 
1224     return hard_iface;
1225 
1226 err_put_hardif:
1227     batadv_hardif_put(hard_iface);
1228 err_put_harddev:
1229     dev_put(hard_dev);
1230 
1231     return ERR_PTR(-EINVAL);
1232 }
1233 
1234 /**
1235  * batadv_get_vlan_from_info() - Retrieve vlan from genl attributes
1236  * @bat_priv: the bat priv with all the soft interface information
1237  * @net: the applicable net namespace
1238  * @info: receiver information
1239  *
1240  * Return: Pointer to vlan on success (with increased refcnt), error pointer
1241  *  on error
1242  */
1243 static struct batadv_softif_vlan *
1244 batadv_get_vlan_from_info(struct batadv_priv *bat_priv, struct net *net,
1245               struct genl_info *info)
1246 {
1247     struct batadv_softif_vlan *vlan;
1248     u16 vid;
1249 
1250     if (!info->attrs[BATADV_ATTR_VLANID])
1251         return ERR_PTR(-EINVAL);
1252 
1253     vid = nla_get_u16(info->attrs[BATADV_ATTR_VLANID]);
1254 
1255     vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
1256     if (!vlan)
1257         return ERR_PTR(-ENOENT);
1258 
1259     return vlan;
1260 }
1261 
1262 /**
1263  * batadv_pre_doit() - Prepare batman-adv genl doit request
1264  * @ops: requested netlink operation
1265  * @skb: Netlink message with request data
1266  * @info: receiver information
1267  *
1268  * Return: 0 on success or negative error number in case of failure
1269  */
1270 static int batadv_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
1271                struct genl_info *info)
1272 {
1273     struct net *net = genl_info_net(info);
1274     struct batadv_hard_iface *hard_iface;
1275     struct batadv_priv *bat_priv = NULL;
1276     struct batadv_softif_vlan *vlan;
1277     struct net_device *soft_iface;
1278     u8 user_ptr1_flags;
1279     u8 mesh_dep_flags;
1280     int ret;
1281 
1282     user_ptr1_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
1283     if (WARN_ON(hweight8(ops->internal_flags & user_ptr1_flags) > 1))
1284         return -EINVAL;
1285 
1286     mesh_dep_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
1287     if (WARN_ON((ops->internal_flags & mesh_dep_flags) &&
1288             (~ops->internal_flags & BATADV_FLAG_NEED_MESH)))
1289         return -EINVAL;
1290 
1291     if (ops->internal_flags & BATADV_FLAG_NEED_MESH) {
1292         soft_iface = batadv_get_softif_from_info(net, info);
1293         if (IS_ERR(soft_iface))
1294             return PTR_ERR(soft_iface);
1295 
1296         bat_priv = netdev_priv(soft_iface);
1297         info->user_ptr[0] = bat_priv;
1298     }
1299 
1300     if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF) {
1301         hard_iface = batadv_get_hardif_from_info(bat_priv, net, info);
1302         if (IS_ERR(hard_iface)) {
1303             ret = PTR_ERR(hard_iface);
1304             goto err_put_softif;
1305         }
1306 
1307         info->user_ptr[1] = hard_iface;
1308     }
1309 
1310     if (ops->internal_flags & BATADV_FLAG_NEED_VLAN) {
1311         vlan = batadv_get_vlan_from_info(bat_priv, net, info);
1312         if (IS_ERR(vlan)) {
1313             ret = PTR_ERR(vlan);
1314             goto err_put_softif;
1315         }
1316 
1317         info->user_ptr[1] = vlan;
1318     }
1319 
1320     return 0;
1321 
1322 err_put_softif:
1323     if (bat_priv)
1324         dev_put(bat_priv->soft_iface);
1325 
1326     return ret;
1327 }
1328 
1329 /**
1330  * batadv_post_doit() - End batman-adv genl doit request
1331  * @ops: requested netlink operation
1332  * @skb: Netlink message with request data
1333  * @info: receiver information
1334  */
1335 static void batadv_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
1336                  struct genl_info *info)
1337 {
1338     struct batadv_hard_iface *hard_iface;
1339     struct batadv_softif_vlan *vlan;
1340     struct batadv_priv *bat_priv;
1341 
1342     if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF &&
1343         info->user_ptr[1]) {
1344         hard_iface = info->user_ptr[1];
1345 
1346         batadv_hardif_put(hard_iface);
1347     }
1348 
1349     if (ops->internal_flags & BATADV_FLAG_NEED_VLAN && info->user_ptr[1]) {
1350         vlan = info->user_ptr[1];
1351         batadv_softif_vlan_put(vlan);
1352     }
1353 
1354     if (ops->internal_flags & BATADV_FLAG_NEED_MESH && info->user_ptr[0]) {
1355         bat_priv = info->user_ptr[0];
1356         dev_put(bat_priv->soft_iface);
1357     }
1358 }
1359 
1360 static const struct genl_small_ops batadv_netlink_ops[] = {
1361     {
1362         .cmd = BATADV_CMD_GET_MESH,
1363         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1364         /* can be retrieved by unprivileged users */
1365         .doit = batadv_netlink_get_mesh,
1366         .internal_flags = BATADV_FLAG_NEED_MESH,
1367     },
1368     {
1369         .cmd = BATADV_CMD_TP_METER,
1370         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1371         .flags = GENL_UNS_ADMIN_PERM,
1372         .doit = batadv_netlink_tp_meter_start,
1373         .internal_flags = BATADV_FLAG_NEED_MESH,
1374     },
1375     {
1376         .cmd = BATADV_CMD_TP_METER_CANCEL,
1377         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1378         .flags = GENL_UNS_ADMIN_PERM,
1379         .doit = batadv_netlink_tp_meter_cancel,
1380         .internal_flags = BATADV_FLAG_NEED_MESH,
1381     },
1382     {
1383         .cmd = BATADV_CMD_GET_ROUTING_ALGOS,
1384         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1385         .flags = GENL_UNS_ADMIN_PERM,
1386         .dumpit = batadv_algo_dump,
1387     },
1388     {
1389         .cmd = BATADV_CMD_GET_HARDIF,
1390         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1391         /* can be retrieved by unprivileged users */
1392         .dumpit = batadv_netlink_dump_hardif,
1393         .doit = batadv_netlink_get_hardif,
1394         .internal_flags = BATADV_FLAG_NEED_MESH |
1395                   BATADV_FLAG_NEED_HARDIF,
1396     },
1397     {
1398         .cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
1399         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1400         .flags = GENL_UNS_ADMIN_PERM,
1401         .dumpit = batadv_tt_local_dump,
1402     },
1403     {
1404         .cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
1405         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1406         .flags = GENL_UNS_ADMIN_PERM,
1407         .dumpit = batadv_tt_global_dump,
1408     },
1409     {
1410         .cmd = BATADV_CMD_GET_ORIGINATORS,
1411         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1412         .flags = GENL_UNS_ADMIN_PERM,
1413         .dumpit = batadv_orig_dump,
1414     },
1415     {
1416         .cmd = BATADV_CMD_GET_NEIGHBORS,
1417         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1418         .flags = GENL_UNS_ADMIN_PERM,
1419         .dumpit = batadv_hardif_neigh_dump,
1420     },
1421     {
1422         .cmd = BATADV_CMD_GET_GATEWAYS,
1423         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1424         .flags = GENL_UNS_ADMIN_PERM,
1425         .dumpit = batadv_gw_dump,
1426     },
1427     {
1428         .cmd = BATADV_CMD_GET_BLA_CLAIM,
1429         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1430         .flags = GENL_UNS_ADMIN_PERM,
1431         .dumpit = batadv_bla_claim_dump,
1432     },
1433     {
1434         .cmd = BATADV_CMD_GET_BLA_BACKBONE,
1435         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1436         .flags = GENL_UNS_ADMIN_PERM,
1437         .dumpit = batadv_bla_backbone_dump,
1438     },
1439     {
1440         .cmd = BATADV_CMD_GET_DAT_CACHE,
1441         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1442         .flags = GENL_UNS_ADMIN_PERM,
1443         .dumpit = batadv_dat_cache_dump,
1444     },
1445     {
1446         .cmd = BATADV_CMD_GET_MCAST_FLAGS,
1447         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1448         .flags = GENL_UNS_ADMIN_PERM,
1449         .dumpit = batadv_mcast_flags_dump,
1450     },
1451     {
1452         .cmd = BATADV_CMD_SET_MESH,
1453         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1454         .flags = GENL_UNS_ADMIN_PERM,
1455         .doit = batadv_netlink_set_mesh,
1456         .internal_flags = BATADV_FLAG_NEED_MESH,
1457     },
1458     {
1459         .cmd = BATADV_CMD_SET_HARDIF,
1460         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1461         .flags = GENL_UNS_ADMIN_PERM,
1462         .doit = batadv_netlink_set_hardif,
1463         .internal_flags = BATADV_FLAG_NEED_MESH |
1464                   BATADV_FLAG_NEED_HARDIF,
1465     },
1466     {
1467         .cmd = BATADV_CMD_GET_VLAN,
1468         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1469         /* can be retrieved by unprivileged users */
1470         .doit = batadv_netlink_get_vlan,
1471         .internal_flags = BATADV_FLAG_NEED_MESH |
1472                   BATADV_FLAG_NEED_VLAN,
1473     },
1474     {
1475         .cmd = BATADV_CMD_SET_VLAN,
1476         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1477         .flags = GENL_UNS_ADMIN_PERM,
1478         .doit = batadv_netlink_set_vlan,
1479         .internal_flags = BATADV_FLAG_NEED_MESH |
1480                   BATADV_FLAG_NEED_VLAN,
1481     },
1482 };
1483 
1484 struct genl_family batadv_netlink_family __ro_after_init = {
1485     .hdrsize = 0,
1486     .name = BATADV_NL_NAME,
1487     .version = 1,
1488     .maxattr = BATADV_ATTR_MAX,
1489     .policy = batadv_netlink_policy,
1490     .netnsok = true,
1491     .pre_doit = batadv_pre_doit,
1492     .post_doit = batadv_post_doit,
1493     .module = THIS_MODULE,
1494     .small_ops = batadv_netlink_ops,
1495     .n_small_ops = ARRAY_SIZE(batadv_netlink_ops),
1496     .mcgrps = batadv_netlink_mcgrps,
1497     .n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
1498 };
1499 
1500 /**
1501  * batadv_netlink_register() - register batadv genl netlink family
1502  */
1503 void __init batadv_netlink_register(void)
1504 {
1505     int ret;
1506 
1507     ret = genl_register_family(&batadv_netlink_family);
1508     if (ret)
1509         pr_warn("unable to register netlink family");
1510 }
1511 
1512 /**
1513  * batadv_netlink_unregister() - unregister batadv genl netlink family
1514  */
1515 void batadv_netlink_unregister(void)
1516 {
1517     genl_unregister_family(&batadv_netlink_family);
1518 }
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