net/bridge/br_mdb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/err.h>
   3 #include <linux/igmp.h>
   4 #include <linux/kernel.h>
   5 #include <linux/netdevice.h>
   6 #include <linux/rculist.h>
   7 #include <linux/skbuff.h>
   8 #include <linux/if_ether.h>
   9 #include <net/ip.h>
  10 #include <net/netlink.h>
  11 #include <net/switchdev.h>
  12 #if IS_ENABLED(CONFIG_IPV6)
  13 #include <net/ipv6.h>
  14 #include <net/addrconf.h>
  15 #endif
  16
  17 #include "br_private.h"
  18
  19 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
  20                                struct net_device *dev)
  21 {
  22         struct net_bridge *br = netdev_priv(dev);
  23         struct net_bridge_port *p;
  24         struct nlattr *nest, *port_nest;
  25
  26         if (!br->multicast_router || hlist_empty(&br->router_list))
  27                 return 0;
  28
  29         nest = nla_nest_start(skb, MDBA_ROUTER);
  30         if (nest == NULL)
  31                 return -EMSGSIZE;
  32
  33         hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
  34                 if (!p)
  35                         continue;
  36                 port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT);
  37                 if (!port_nest)
  38                         goto fail;
  39                 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
  40                     nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
  41                                 br_timer_value(&p->multicast_router_timer)) ||
  42                     nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
  43                                p->multicast_router)) {
  44                         nla_nest_cancel(skb, port_nest);
  45                         goto fail;
  46                 }
  47                 nla_nest_end(skb, port_nest);
  48         }
  49
  50         nla_nest_end(skb, nest);
  51         return 0;
  52 fail:
  53         nla_nest_cancel(skb, nest);
  54         return -EMSGSIZE;
  55 }
  56
  57 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
  58 {
  59         e->state = flags & MDB_PG_FLAGS_PERMANENT;
  60         e->flags = 0;
  61         if (flags & MDB_PG_FLAGS_OFFLOAD)
  62                 e->flags |= MDB_FLAGS_OFFLOAD;
  63 }
  64
  65 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip)
  66 {
  67         memset(ip, 0, sizeof(struct br_ip));
  68         ip->vid = entry->vid;
  69         ip->proto = entry->addr.proto;
  70         if (ip->proto == htons(ETH_P_IP))
  71                 ip->u.ip4 = entry->addr.u.ip4;
  72 #if IS_ENABLED(CONFIG_IPV6)
  73         else
  74                 ip->u.ip6 = entry->addr.u.ip6;
  75 #endif
  76 }
  77
  78 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
  79                             struct net_device *dev)
  80 {
  81         struct net_bridge *br = netdev_priv(dev);
  82         struct net_bridge_mdb_htable *mdb;
  83         struct nlattr *nest, *nest2;
  84         int i, err = 0;
  85         int idx = 0, s_idx = cb->args[1];
  86
  87         if (br->multicast_disabled)
  88                 return 0;
  89
  90         mdb = rcu_dereference(br->mdb);
  91         if (!mdb)
  92                 return 0;
  93
  94         nest = nla_nest_start(skb, MDBA_MDB);
  95         if (nest == NULL)
  96                 return -EMSGSIZE;
  97
  98         for (i = 0; i < mdb->max; i++) {
  99                 struct net_bridge_mdb_entry *mp;
 100                 struct net_bridge_port_group *p;
 101                 struct net_bridge_port_group __rcu **pp;
 102                 struct net_bridge_port *port;
 103
 104                 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
 105                         if (idx < s_idx)
 106                                 goto skip;
 107
 108                         nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
 109                         if (nest2 == NULL) {
 110                                 err = -EMSGSIZE;
 111                                 goto out;
 112                         }
 113
 114                         for (pp = &mp->ports;
 115                              (p = rcu_dereference(*pp)) != NULL;
 116                               pp = &p->next) {
 117                                 struct nlattr *nest_ent;
 118                                 struct br_mdb_entry e;
 119
 120                                 port = p->port;
 121                                 if (!port)
 122                                         continue;
 123
 124                                 memset(&e, 0, sizeof(e));
 125                                 e.ifindex = port->dev->ifindex;
 126                                 e.vid = p->addr.vid;
 127                                 __mdb_entry_fill_flags(&e, p->flags);
 128                                 if (p->addr.proto == htons(ETH_P_IP))
 129                                         e.addr.u.ip4 = p->addr.u.ip4;
 130 #if IS_ENABLED(CONFIG_IPV6)
 131                                 if (p->addr.proto == htons(ETH_P_IPV6))
 132                                         e.addr.u.ip6 = p->addr.u.ip6;
 133 #endif
 134                                 e.addr.proto = p->addr.proto;
 135                                 nest_ent = nla_nest_start(skb,
 136                                                           MDBA_MDB_ENTRY_INFO);
 137                                 if (!nest_ent) {
 138                                         nla_nest_cancel(skb, nest2);
 139                                         err = -EMSGSIZE;
 140                                         goto out;
 141                                 }
 142                                 if (nla_put_nohdr(skb, sizeof(e), &e) ||
 143                                     nla_put_u32(skb,
 144                                                 MDBA_MDB_EATTR_TIMER,
 145                                                 br_timer_value(&p->timer))) {
 146                                         nla_nest_cancel(skb, nest_ent);
 147                                         nla_nest_cancel(skb, nest2);
 148                                         err = -EMSGSIZE;
 149                                         goto out;
 150                                 }
 151                                 nla_nest_end(skb, nest_ent);
 152                         }
 153                         nla_nest_end(skb, nest2);
 154                 skip:
 155                         idx++;
 156                 }
 157         }
 158
 159 out:
 160         cb->args[1] = idx;
 161         nla_nest_end(skb, nest);
 162         return err;
 163 }
 164
 165 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
 166 {
 167         struct net_device *dev;
 168         struct net *net = sock_net(skb->sk);
 169         struct nlmsghdr *nlh = NULL;
 170         int idx = 0, s_idx;
 171
 172         s_idx = cb->args[0];
 173
 174         rcu_read_lock();
 175
 176         /* In theory this could be wrapped to 0... */
 177         cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
 178
 179         for_each_netdev_rcu(net, dev) {
 180                 if (dev->priv_flags & IFF_EBRIDGE) {
 181                         struct br_port_msg *bpm;
 182
 183                         if (idx < s_idx)
 184                                 goto skip;
 185
 186                         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
 187                                         cb->nlh->nlmsg_seq, RTM_GETMDB,
 188                                         sizeof(*bpm), NLM_F_MULTI);
 189                         if (nlh == NULL)
 190                                 break;
 191
 192                         bpm = nlmsg_data(nlh);
 193                         memset(bpm, 0, sizeof(*bpm));
 194                         bpm->ifindex = dev->ifindex;
 195                         if (br_mdb_fill_info(skb, cb, dev) < 0)
 196                                 goto out;
 197                         if (br_rports_fill_info(skb, cb, dev) < 0)
 198                                 goto out;
 199
 200                         cb->args[1] = 0;
 201                         nlmsg_end(skb, nlh);
 202                 skip:
 203                         idx++;
 204                 }
 205         }
 206
 207 out:
 208         if (nlh)
 209                 nlmsg_end(skb, nlh);
 210         rcu_read_unlock();
 211         cb->args[0] = idx;
 212         return skb->len;
 213 }
 214
 215 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
 216                                    struct net_device *dev,
 217                                    struct br_mdb_entry *entry, u32 pid,
 218                                    u32 seq, int type, unsigned int flags)
 219 {
 220         struct nlmsghdr *nlh;
 221         struct br_port_msg *bpm;
 222         struct nlattr *nest, *nest2;
 223
 224         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
 225         if (!nlh)
 226                 return -EMSGSIZE;
 227
 228         bpm = nlmsg_data(nlh);
 229         memset(bpm, 0, sizeof(*bpm));
 230         bpm->family  = AF_BRIDGE;
 231         bpm->ifindex = dev->ifindex;
 232         nest = nla_nest_start(skb, MDBA_MDB);
 233         if (nest == NULL)
 234                 goto cancel;
 235         nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
 236         if (nest2 == NULL)
 237                 goto end;
 238
 239         if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
 240                 goto end;
 241
 242         nla_nest_end(skb, nest2);
 243         nla_nest_end(skb, nest);
 244         nlmsg_end(skb, nlh);
 245         return 0;
 246
 247 end:
 248         nla_nest_end(skb, nest);
 249 cancel:
 250         nlmsg_cancel(skb, nlh);
 251         return -EMSGSIZE;
 252 }
 253
 254 static inline size_t rtnl_mdb_nlmsg_size(void)
 255 {
 256         return NLMSG_ALIGN(sizeof(struct br_port_msg))
 257                 + nla_total_size(sizeof(struct br_mdb_entry));
 258 }
 259
 260 struct br_mdb_complete_info {
 261         struct net_bridge_port *port;
 262         struct br_ip ip;
 263 };
 264
 265 static void br_mdb_complete(struct net_device *dev, int err, void *priv)
 266 {
 267         struct br_mdb_complete_info *data = priv;
 268         struct net_bridge_port_group __rcu **pp;
 269         struct net_bridge_port_group *p;
 270         struct net_bridge_mdb_htable *mdb;
 271         struct net_bridge_mdb_entry *mp;
 272         struct net_bridge_port *port = data->port;
 273         struct net_bridge *br = port->br;
 274
 275         if (err)
 276                 goto err;
 277
 278         spin_lock_bh(&br->multicast_lock);
 279         mdb = mlock_dereference(br->mdb, br);
 280         mp = br_mdb_ip_get(mdb, &data->ip);
 281         if (!mp)
 282                 goto out;
 283         for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
 284              pp = &p->next) {
 285                 if (p->port != port)
 286                         continue;
 287                 p->flags |= MDB_PG_FLAGS_OFFLOAD;
 288         }
 289 out:
 290         spin_unlock_bh(&br->multicast_lock);
 291 err:
 292         kfree(priv);
 293 }
 294
 295 static void br_mdb_switchdev_host_port(struct net_device *dev,
 296                                        struct net_device *lower_dev,
 297                                        struct br_mdb_entry *entry, int type)
 298 {
 299         struct switchdev_obj_port_mdb mdb = {
 300                 .obj = {
 301                         .id = SWITCHDEV_OBJ_ID_HOST_MDB,
 302                         .flags = SWITCHDEV_F_DEFER,
 303                 },
 304                 .vid = entry->vid,
 305         };
 306
 307         if (entry->addr.proto == htons(ETH_P_IP))
 308                 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
 309 #if IS_ENABLED(CONFIG_IPV6)
 310         else
 311                 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
 312 #endif
 313
 314         mdb.obj.orig_dev = dev;
 315         switch (type) {
 316         case RTM_NEWMDB:
 317                 switchdev_port_obj_add(lower_dev, &mdb.obj);
 318                 break;
 319         case RTM_DELMDB:
 320                 switchdev_port_obj_del(lower_dev, &mdb.obj);
 321                 break;
 322         }
 323 }
 324
 325 static void br_mdb_switchdev_host(struct net_device *dev,
 326                                   struct br_mdb_entry *entry, int type)
 327 {
 328         struct net_device *lower_dev;
 329         struct list_head *iter;
 330
 331         netdev_for_each_lower_dev(dev, lower_dev, iter)
 332                 br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
 333 }
 334
 335 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
 336                             struct br_mdb_entry *entry, int type)
 337 {
 338         struct br_mdb_complete_info *complete_info;
 339         struct switchdev_obj_port_mdb mdb = {
 340                 .obj = {
 341                         .id = SWITCHDEV_OBJ_ID_PORT_MDB,
 342                         .flags = SWITCHDEV_F_DEFER,
 343                 },
 344                 .vid = entry->vid,
 345         };
 346         struct net_device *port_dev;
 347         struct net *net = dev_net(dev);
 348         struct sk_buff *skb;
 349         int err = -ENOBUFS;
 350
 351         port_dev = __dev_get_by_index(net, entry->ifindex);
 352         if (entry->addr.proto == htons(ETH_P_IP))
 353                 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
 354 #if IS_ENABLED(CONFIG_IPV6)
 355         else
 356                 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
 357 #endif
 358
 359         mdb.obj.orig_dev = port_dev;
 360         if (p && port_dev && type == RTM_NEWMDB) {
 361                 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
 362                 if (complete_info) {
 363                         complete_info->port = p;
 364                         __mdb_entry_to_br_ip(entry, &complete_info->ip);
 365                         mdb.obj.complete_priv = complete_info;
 366                         mdb.obj.complete = br_mdb_complete;
 367                         if (switchdev_port_obj_add(port_dev, &mdb.obj))
 368                                 kfree(complete_info);
 369                 }
 370         } else if (p && port_dev && type == RTM_DELMDB) {
 371                 switchdev_port_obj_del(port_dev, &mdb.obj);
 372         }
 373
 374         if (!p)
 375                 br_mdb_switchdev_host(dev, entry, type);
 376
 377         skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
 378         if (!skb)
 379                 goto errout;
 380
 381         err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
 382         if (err < 0) {
 383                 kfree_skb(skb);
 384                 goto errout;
 385         }
 386
 387         rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
 388         return;
 389 errout:
 390         rtnl_set_sk_err(net, RTNLGRP_MDB, err);
 391 }
 392
 393 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 394                    struct br_ip *group, int type, u8 flags)
 395 {
 396         struct br_mdb_entry entry;
 397
 398         memset(&entry, 0, sizeof(entry));
 399         if (port)
 400                 entry.ifindex = port->dev->ifindex;
 401         else
 402                 entry.ifindex = dev->ifindex;
 403         entry.addr.proto = group->proto;
 404         entry.addr.u.ip4 = group->u.ip4;
 405 #if IS_ENABLED(CONFIG_IPV6)
 406         entry.addr.u.ip6 = group->u.ip6;
 407 #endif
 408         entry.vid = group->vid;
 409         __mdb_entry_fill_flags(&entry, flags);
 410         __br_mdb_notify(dev, port, &entry, type);
 411 }
 412
 413 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
 414                                    struct net_device *dev,
 415                                    int ifindex, u32 pid,
 416                                    u32 seq, int type, unsigned int flags)
 417 {
 418         struct br_port_msg *bpm;
 419         struct nlmsghdr *nlh;
 420         struct nlattr *nest;
 421
 422         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
 423         if (!nlh)
 424                 return -EMSGSIZE;
 425
 426         bpm = nlmsg_data(nlh);
 427         memset(bpm, 0, sizeof(*bpm));
 428         bpm->family = AF_BRIDGE;
 429         bpm->ifindex = dev->ifindex;
 430         nest = nla_nest_start(skb, MDBA_ROUTER);
 431         if (!nest)
 432                 goto cancel;
 433
 434         if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
 435                 goto end;
 436
 437         nla_nest_end(skb, nest);
 438         nlmsg_end(skb, nlh);
 439         return 0;
 440
 441 end:
 442         nla_nest_end(skb, nest);
 443 cancel:
 444         nlmsg_cancel(skb, nlh);
 445         return -EMSGSIZE;
 446 }
 447
 448 static inline size_t rtnl_rtr_nlmsg_size(void)
 449 {
 450         return NLMSG_ALIGN(sizeof(struct br_port_msg))
 451                 + nla_total_size(sizeof(__u32));
 452 }
 453
 454 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 455                    int type)
 456 {
 457         struct net *net = dev_net(dev);
 458         struct sk_buff *skb;
 459         int err = -ENOBUFS;
 460         int ifindex;
 461
 462         ifindex = port ? port->dev->ifindex : 0;
 463         skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
 464         if (!skb)
 465                 goto errout;
 466
 467         err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
 468         if (err < 0) {
 469                 kfree_skb(skb);
 470                 goto errout;
 471         }
 472
 473         rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
 474         return;
 475
 476 errout:
 477         rtnl_set_sk_err(net, RTNLGRP_MDB, err);
 478 }
 479
 480 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
 481 {
 482         if (entry->ifindex == 0)
 483                 return false;
 484
 485         if (entry->addr.proto == htons(ETH_P_IP)) {
 486                 if (!ipv4_is_multicast(entry->addr.u.ip4))
 487                         return false;
 488                 if (ipv4_is_local_multicast(entry->addr.u.ip4))
 489                         return false;
 490 #if IS_ENABLED(CONFIG_IPV6)
 491         } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
 492                 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
 493                         return false;
 494 #endif
 495         } else
 496                 return false;
 497         if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
 498                 return false;
 499         if (entry->vid >= VLAN_VID_MASK)
 500                 return false;
 501
 502         return true;
 503 }
 504
 505 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
 506                         struct net_device **pdev, struct br_mdb_entry **pentry)
 507 {
 508         struct net *net = sock_net(skb->sk);
 509         struct br_mdb_entry *entry;
 510         struct br_port_msg *bpm;
 511         struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
 512         struct net_device *dev;
 513         int err;
 514
 515         err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
 516                           NULL);
 517         if (err < 0)
 518                 return err;
 519
 520         bpm = nlmsg_data(nlh);
 521         if (bpm->ifindex == 0) {
 522                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
 523                 return -EINVAL;
 524         }
 525
 526         dev = __dev_get_by_index(net, bpm->ifindex);
 527         if (dev == NULL) {
 528                 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
 529                 return -ENODEV;
 530         }
 531
 532         if (!(dev->priv_flags & IFF_EBRIDGE)) {
 533                 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
 534                 return -EOPNOTSUPP;
 535         }
 536
 537         *pdev = dev;
 538
 539         if (!tb[MDBA_SET_ENTRY] ||
 540             nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
 541                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
 542                 return -EINVAL;
 543         }
 544
 545         entry = nla_data(tb[MDBA_SET_ENTRY]);
 546         if (!is_valid_mdb_entry(entry)) {
 547                 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
 548                 return -EINVAL;
 549         }
 550
 551         *pentry = entry;
 552         return 0;
 553 }
 554
 555 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
 556                             struct br_ip *group, unsigned char state)
 557 {
 558         struct net_bridge_mdb_entry *mp;
 559         struct net_bridge_port_group *p;
 560         struct net_bridge_port_group __rcu **pp;
 561         struct net_bridge_mdb_htable *mdb;
 562         unsigned long now = jiffies;
 563         int err;
 564
 565         mdb = mlock_dereference(br->mdb, br);
 566         mp = br_mdb_ip_get(mdb, group);
 567         if (!mp) {
 568                 mp = br_multicast_new_group(br, port, group);
 569                 err = PTR_ERR_OR_ZERO(mp);
 570                 if (err)
 571                         return err;
 572         }
 573
 574         for (pp = &mp->ports;
 575              (p = mlock_dereference(*pp, br)) != NULL;
 576              pp = &p->next) {
 577                 if (p->port == port)
 578                         return -EEXIST;
 579                 if ((unsigned long)p->port < (unsigned long)port)
 580                         break;
 581         }
 582
 583         p = br_multicast_new_port_group(port, group, *pp, state, NULL);
 584         if (unlikely(!p))
 585                 return -ENOMEM;
 586         rcu_assign_pointer(*pp, p);
 587         if (state == MDB_TEMPORARY)
 588                 mod_timer(&p->timer, now + br->multicast_membership_interval);
 589
 590         return 0;
 591 }
 592
 593 static int __br_mdb_add(struct net *net, struct net_bridge *br,
 594                         struct br_mdb_entry *entry)
 595 {
 596         struct br_ip ip;
 597         struct net_device *dev;
 598         struct net_bridge_port *p;
 599         int ret;
 600
 601         if (!netif_running(br->dev) || br->multicast_disabled)
 602                 return -EINVAL;
 603
 604         dev = __dev_get_by_index(net, entry->ifindex);
 605         if (!dev)
 606                 return -ENODEV;
 607
 608         p = br_port_get_rtnl(dev);
 609         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 610                 return -EINVAL;
 611
 612         __mdb_entry_to_br_ip(entry, &ip);
 613
 614         spin_lock_bh(&br->multicast_lock);
 615         ret = br_mdb_add_group(br, p, &ip, entry->state);
 616         spin_unlock_bh(&br->multicast_lock);
 617         return ret;
 618 }
 619
 620 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 621                       struct netlink_ext_ack *extack)
 622 {
 623         struct net *net = sock_net(skb->sk);
 624         struct net_bridge_vlan_group *vg;
 625         struct net_device *dev, *pdev;
 626         struct br_mdb_entry *entry;
 627         struct net_bridge_port *p;
 628         struct net_bridge_vlan *v;
 629         struct net_bridge *br;
 630         int err;
 631
 632         err = br_mdb_parse(skb, nlh, &dev, &entry);
 633         if (err < 0)
 634                 return err;
 635
 636         br = netdev_priv(dev);
 637
 638         /* If vlan filtering is enabled and VLAN is not specified
 639          * install mdb entry on all vlans configured on the port.
 640          */
 641         pdev = __dev_get_by_index(net, entry->ifindex);
 642         if (!pdev)
 643                 return -ENODEV;
 644
 645         p = br_port_get_rtnl(pdev);
 646         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 647                 return -EINVAL;
 648
 649         vg = nbp_vlan_group(p);
 650         if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
 651                 list_for_each_entry(v, &vg->vlan_list, vlist) {
 652                         entry->vid = v->vid;
 653                         err = __br_mdb_add(net, br, entry);
 654                         if (err)
 655                                 break;
 656                         __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
 657                 }
 658         } else {
 659                 err = __br_mdb_add(net, br, entry);
 660                 if (!err)
 661                         __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
 662         }
 663
 664         return err;
 665 }
 666
 667 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
 668 {
 669         struct net_bridge_mdb_htable *mdb;
 670         struct net_bridge_mdb_entry *mp;
 671         struct net_bridge_port_group *p;
 672         struct net_bridge_port_group __rcu **pp;
 673         struct br_ip ip;
 674         int err = -EINVAL;
 675
 676         if (!netif_running(br->dev) || br->multicast_disabled)
 677                 return -EINVAL;
 678
 679         __mdb_entry_to_br_ip(entry, &ip);
 680
 681         spin_lock_bh(&br->multicast_lock);
 682         mdb = mlock_dereference(br->mdb, br);
 683
 684         mp = br_mdb_ip_get(mdb, &ip);
 685         if (!mp)
 686                 goto unlock;
 687
 688         for (pp = &mp->ports;
 689              (p = mlock_dereference(*pp, br)) != NULL;
 690              pp = &p->next) {
 691                 if (!p->port || p->port->dev->ifindex != entry->ifindex)
 692                         continue;
 693
 694                 if (p->port->state == BR_STATE_DISABLED)
 695                         goto unlock;
 696
 697                 __mdb_entry_fill_flags(entry, p->flags);
 698                 rcu_assign_pointer(*pp, p->next);
 699                 hlist_del_init(&p->mglist);
 700                 del_timer(&p->timer);
 701                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 702                 err = 0;
 703
 704                 if (!mp->ports && !mp->host_joined &&
 705                     netif_running(br->dev))
 706                         mod_timer(&mp->timer, jiffies);
 707                 break;
 708         }
 709
 710 unlock:
 711         spin_unlock_bh(&br->multicast_lock);
 712         return err;
 713 }
 714
 715 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
 716                       struct netlink_ext_ack *extack)
 717 {
 718         struct net *net = sock_net(skb->sk);
 719         struct net_bridge_vlan_group *vg;
 720         struct net_device *dev, *pdev;
 721         struct br_mdb_entry *entry;
 722         struct net_bridge_port *p;
 723         struct net_bridge_vlan *v;
 724         struct net_bridge *br;
 725         int err;
 726
 727         err = br_mdb_parse(skb, nlh, &dev, &entry);
 728         if (err < 0)
 729                 return err;
 730
 731         br = netdev_priv(dev);
 732
 733         /* If vlan filtering is enabled and VLAN is not specified
 734          * delete mdb entry on all vlans configured on the port.
 735          */
 736         pdev = __dev_get_by_index(net, entry->ifindex);
 737         if (!pdev)
 738                 return -ENODEV;
 739
 740         p = br_port_get_rtnl(pdev);
 741         if (!p || p->br != br || p->state == BR_STATE_DISABLED)
 742                 return -EINVAL;
 743
 744         vg = nbp_vlan_group(p);
 745         if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
 746                 list_for_each_entry(v, &vg->vlan_list, vlist) {
 747                         entry->vid = v->vid;
 748                         err = __br_mdb_del(br, entry);
 749                         if (!err)
 750                                 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
 751                 }
 752         } else {
 753                 err = __br_mdb_del(br, entry);
 754                 if (!err)
 755                         __br_mdb_notify(dev, p, entry, RTM_DELMDB);
 756         }
 757
 758         return err;
 759 }
 760
 761 void br_mdb_init(void)
 762 {
 763         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
 764         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
 765         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
 766 }
 767
 768 void br_mdb_uninit(void)
 769 {
 770         rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
 771         rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
 772         rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
 773 }