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 bool 20 br_ip4_rports_get_timer(struct net_bridge_mcast_port *pmctx, 21 unsigned long *timer) 22 { 23 *timer = br_timer_value(&pmctx->ip4_mc_router_timer); 24 return !hlist_unhashed(&pmctx->ip4_rlist); 25 } 26 27 static bool 28 br_ip6_rports_get_timer(struct net_bridge_mcast_port *pmctx, 29 unsigned long *timer) 30 { 31 #if IS_ENABLED(CONFIG_IPV6) 32 *timer = br_timer_value(&pmctx->ip6_mc_router_timer); 33 return !hlist_unhashed(&pmctx->ip6_rlist); 34 #else 35 *timer = 0; 36 return false; 37 #endif 38 } 39 40 static size_t __br_rports_one_size(void) 41 { 42 return nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PORT */ 43 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_TIMER */ 44 nla_total_size(sizeof(u8)) + /* MDBA_ROUTER_PATTR_TYPE */ 45 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET_TIMER */ 46 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET6_TIMER */ 47 nla_total_size(sizeof(u32)); /* MDBA_ROUTER_PATTR_VID */ 48 } 49 50 size_t br_rports_size(const struct net_bridge_mcast *brmctx) 51 { 52 struct net_bridge_mcast_port *pmctx; 53 size_t size = nla_total_size(0); /* MDBA_ROUTER */ 54 55 rcu_read_lock(); 56 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list, 57 ip4_rlist) 58 size += __br_rports_one_size(); 59 60 #if IS_ENABLED(CONFIG_IPV6) 61 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list, 62 ip6_rlist) 63 size += __br_rports_one_size(); 64 #endif 65 rcu_read_unlock(); 66 67 return size; 68 } 69 70 int br_rports_fill_info(struct sk_buff *skb, 71 const struct net_bridge_mcast *brmctx) 72 { 73 u16 vid = brmctx->vlan ? brmctx->vlan->vid : 0; 74 bool have_ip4_mc_rtr, have_ip6_mc_rtr; 75 unsigned long ip4_timer, ip6_timer; 76 struct nlattr *nest, *port_nest; 77 struct net_bridge_port *p; 78 79 if (!brmctx->multicast_router || !br_rports_have_mc_router(brmctx)) 80 return 0; 81 82 nest = nla_nest_start_noflag(skb, MDBA_ROUTER); 83 if (nest == NULL) 84 return -EMSGSIZE; 85 86 list_for_each_entry_rcu(p, &brmctx->br->port_list, list) { 87 struct net_bridge_mcast_port *pmctx; 88 89 if (vid) { 90 struct net_bridge_vlan *v; 91 92 v = br_vlan_find(nbp_vlan_group(p), vid); 93 if (!v) 94 continue; 95 pmctx = &v->port_mcast_ctx; 96 } else { 97 pmctx = &p->multicast_ctx; 98 } 99 100 have_ip4_mc_rtr = br_ip4_rports_get_timer(pmctx, &ip4_timer); 101 have_ip6_mc_rtr = br_ip6_rports_get_timer(pmctx, &ip6_timer); 102 103 if (!have_ip4_mc_rtr && !have_ip6_mc_rtr) 104 continue; 105 106 port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT); 107 if (!port_nest) 108 goto fail; 109 110 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) || 111 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER, 112 max(ip4_timer, ip6_timer)) || 113 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE, 114 p->multicast_ctx.multicast_router) || 115 (have_ip4_mc_rtr && 116 nla_put_u32(skb, MDBA_ROUTER_PATTR_INET_TIMER, 117 ip4_timer)) || 118 (have_ip6_mc_rtr && 119 nla_put_u32(skb, MDBA_ROUTER_PATTR_INET6_TIMER, 120 ip6_timer)) || 121 (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid))) { 122 nla_nest_cancel(skb, port_nest); 123 goto fail; 124 } 125 nla_nest_end(skb, port_nest); 126 } 127 128 nla_nest_end(skb, nest); 129 return 0; 130 fail: 131 nla_nest_cancel(skb, nest); 132 return -EMSGSIZE; 133 } 134 135 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags) 136 { 137 e->state = flags & MDB_PG_FLAGS_PERMANENT; 138 e->flags = 0; 139 if (flags & MDB_PG_FLAGS_OFFLOAD) 140 e->flags |= MDB_FLAGS_OFFLOAD; 141 if (flags & MDB_PG_FLAGS_FAST_LEAVE) 142 e->flags |= MDB_FLAGS_FAST_LEAVE; 143 if (flags & MDB_PG_FLAGS_STAR_EXCL) 144 e->flags |= MDB_FLAGS_STAR_EXCL; 145 if (flags & MDB_PG_FLAGS_BLOCKED) 146 e->flags |= MDB_FLAGS_BLOCKED; 147 } 148 149 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip, 150 struct nlattr **mdb_attrs) 151 { 152 memset(ip, 0, sizeof(struct br_ip)); 153 ip->vid = entry->vid; 154 ip->proto = entry->addr.proto; 155 switch (ip->proto) { 156 case htons(ETH_P_IP): 157 ip->dst.ip4 = entry->addr.u.ip4; 158 if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE]) 159 ip->src.ip4 = nla_get_in_addr(mdb_attrs[MDBE_ATTR_SOURCE]); 160 break; 161 #if IS_ENABLED(CONFIG_IPV6) 162 case htons(ETH_P_IPV6): 163 ip->dst.ip6 = entry->addr.u.ip6; 164 if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE]) 165 ip->src.ip6 = nla_get_in6_addr(mdb_attrs[MDBE_ATTR_SOURCE]); 166 break; 167 #endif 168 default: 169 ether_addr_copy(ip->dst.mac_addr, entry->addr.u.mac_addr); 170 } 171 172 } 173 174 static int __mdb_fill_srcs(struct sk_buff *skb, 175 struct net_bridge_port_group *p) 176 { 177 struct net_bridge_group_src *ent; 178 struct nlattr *nest, *nest_ent; 179 180 if (hlist_empty(&p->src_list)) 181 return 0; 182 183 nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST); 184 if (!nest) 185 return -EMSGSIZE; 186 187 hlist_for_each_entry_rcu(ent, &p->src_list, node, 188 lockdep_is_held(&p->key.port->br->multicast_lock)) { 189 nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY); 190 if (!nest_ent) 191 goto out_cancel_err; 192 switch (ent->addr.proto) { 193 case htons(ETH_P_IP): 194 if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS, 195 ent->addr.src.ip4)) { 196 nla_nest_cancel(skb, nest_ent); 197 goto out_cancel_err; 198 } 199 break; 200 #if IS_ENABLED(CONFIG_IPV6) 201 case htons(ETH_P_IPV6): 202 if (nla_put_in6_addr(skb, MDBA_MDB_SRCATTR_ADDRESS, 203 &ent->addr.src.ip6)) { 204 nla_nest_cancel(skb, nest_ent); 205 goto out_cancel_err; 206 } 207 break; 208 #endif 209 default: 210 nla_nest_cancel(skb, nest_ent); 211 continue; 212 } 213 if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER, 214 br_timer_value(&ent->timer))) { 215 nla_nest_cancel(skb, nest_ent); 216 goto out_cancel_err; 217 } 218 nla_nest_end(skb, nest_ent); 219 } 220 221 nla_nest_end(skb, nest); 222 223 return 0; 224 225 out_cancel_err: 226 nla_nest_cancel(skb, nest); 227 return -EMSGSIZE; 228 } 229 230 static int __mdb_fill_info(struct sk_buff *skb, 231 struct net_bridge_mdb_entry *mp, 232 struct net_bridge_port_group *p) 233 { 234 bool dump_srcs_mode = false; 235 struct timer_list *mtimer; 236 struct nlattr *nest_ent; 237 struct br_mdb_entry e; 238 u8 flags = 0; 239 int ifindex; 240 241 memset(&e, 0, sizeof(e)); 242 if (p) { 243 ifindex = p->key.port->dev->ifindex; 244 mtimer = &p->timer; 245 flags = p->flags; 246 } else { 247 ifindex = mp->br->dev->ifindex; 248 mtimer = &mp->timer; 249 } 250 251 __mdb_entry_fill_flags(&e, flags); 252 e.ifindex = ifindex; 253 e.vid = mp->addr.vid; 254 if (mp->addr.proto == htons(ETH_P_IP)) { 255 e.addr.u.ip4 = mp->addr.dst.ip4; 256 #if IS_ENABLED(CONFIG_IPV6) 257 } else if (mp->addr.proto == htons(ETH_P_IPV6)) { 258 e.addr.u.ip6 = mp->addr.dst.ip6; 259 #endif 260 } else { 261 ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr); 262 e.state = MDB_PERMANENT; 263 } 264 e.addr.proto = mp->addr.proto; 265 nest_ent = nla_nest_start_noflag(skb, 266 MDBA_MDB_ENTRY_INFO); 267 if (!nest_ent) 268 return -EMSGSIZE; 269 270 if (nla_put_nohdr(skb, sizeof(e), &e) || 271 nla_put_u32(skb, 272 MDBA_MDB_EATTR_TIMER, 273 br_timer_value(mtimer))) 274 goto nest_err; 275 276 switch (mp->addr.proto) { 277 case htons(ETH_P_IP): 278 dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_igmp_version == 3); 279 if (mp->addr.src.ip4) { 280 if (nla_put_in_addr(skb, MDBA_MDB_EATTR_SOURCE, 281 mp->addr.src.ip4)) 282 goto nest_err; 283 break; 284 } 285 break; 286 #if IS_ENABLED(CONFIG_IPV6) 287 case htons(ETH_P_IPV6): 288 dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_mld_version == 2); 289 if (!ipv6_addr_any(&mp->addr.src.ip6)) { 290 if (nla_put_in6_addr(skb, MDBA_MDB_EATTR_SOURCE, 291 &mp->addr.src.ip6)) 292 goto nest_err; 293 break; 294 } 295 break; 296 #endif 297 default: 298 ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr); 299 } 300 if (p) { 301 if (nla_put_u8(skb, MDBA_MDB_EATTR_RTPROT, p->rt_protocol)) 302 goto nest_err; 303 if (dump_srcs_mode && 304 (__mdb_fill_srcs(skb, p) || 305 nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE, 306 p->filter_mode))) 307 goto nest_err; 308 } 309 nla_nest_end(skb, nest_ent); 310 311 return 0; 312 313 nest_err: 314 nla_nest_cancel(skb, nest_ent); 315 return -EMSGSIZE; 316 } 317 318 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, 319 struct net_device *dev) 320 { 321 int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2]; 322 struct net_bridge *br = netdev_priv(dev); 323 struct net_bridge_mdb_entry *mp; 324 struct nlattr *nest, *nest2; 325 326 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) 327 return 0; 328 329 nest = nla_nest_start_noflag(skb, MDBA_MDB); 330 if (nest == NULL) 331 return -EMSGSIZE; 332 333 hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) { 334 struct net_bridge_port_group *p; 335 struct net_bridge_port_group __rcu **pp; 336 337 if (idx < s_idx) 338 goto skip; 339 340 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY); 341 if (!nest2) { 342 err = -EMSGSIZE; 343 break; 344 } 345 346 if (!s_pidx && mp->host_joined) { 347 err = __mdb_fill_info(skb, mp, NULL); 348 if (err) { 349 nla_nest_cancel(skb, nest2); 350 break; 351 } 352 } 353 354 for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL; 355 pp = &p->next) { 356 if (!p->key.port) 357 continue; 358 if (pidx < s_pidx) 359 goto skip_pg; 360 361 err = __mdb_fill_info(skb, mp, p); 362 if (err) { 363 nla_nest_end(skb, nest2); 364 goto out; 365 } 366 skip_pg: 367 pidx++; 368 } 369 pidx = 0; 370 s_pidx = 0; 371 nla_nest_end(skb, nest2); 372 skip: 373 idx++; 374 } 375 376 out: 377 cb->args[1] = idx; 378 cb->args[2] = pidx; 379 nla_nest_end(skb, nest); 380 return err; 381 } 382 383 int br_mdb_dump(struct net_device *dev, struct sk_buff *skb, 384 struct netlink_callback *cb) 385 { 386 struct net_bridge *br = netdev_priv(dev); 387 struct br_port_msg *bpm; 388 struct nlmsghdr *nlh; 389 int err; 390 391 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, 392 cb->nlh->nlmsg_seq, RTM_GETMDB, sizeof(*bpm), 393 NLM_F_MULTI); 394 if (!nlh) 395 return -EMSGSIZE; 396 397 bpm = nlmsg_data(nlh); 398 memset(bpm, 0, sizeof(*bpm)); 399 bpm->ifindex = dev->ifindex; 400 401 rcu_read_lock(); 402 403 err = br_mdb_fill_info(skb, cb, dev); 404 if (err) 405 goto out; 406 err = br_rports_fill_info(skb, &br->multicast_ctx); 407 if (err) 408 goto out; 409 410 out: 411 rcu_read_unlock(); 412 nlmsg_end(skb, nlh); 413 return err; 414 } 415 416 static int nlmsg_populate_mdb_fill(struct sk_buff *skb, 417 struct net_device *dev, 418 struct net_bridge_mdb_entry *mp, 419 struct net_bridge_port_group *pg, 420 int type) 421 { 422 struct nlmsghdr *nlh; 423 struct br_port_msg *bpm; 424 struct nlattr *nest, *nest2; 425 426 nlh = nlmsg_put(skb, 0, 0, type, sizeof(*bpm), 0); 427 if (!nlh) 428 return -EMSGSIZE; 429 430 bpm = nlmsg_data(nlh); 431 memset(bpm, 0, sizeof(*bpm)); 432 bpm->family = AF_BRIDGE; 433 bpm->ifindex = dev->ifindex; 434 nest = nla_nest_start_noflag(skb, MDBA_MDB); 435 if (nest == NULL) 436 goto cancel; 437 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY); 438 if (nest2 == NULL) 439 goto end; 440 441 if (__mdb_fill_info(skb, mp, pg)) 442 goto end; 443 444 nla_nest_end(skb, nest2); 445 nla_nest_end(skb, nest); 446 nlmsg_end(skb, nlh); 447 return 0; 448 449 end: 450 nla_nest_end(skb, nest); 451 cancel: 452 nlmsg_cancel(skb, nlh); 453 return -EMSGSIZE; 454 } 455 456 static size_t rtnl_mdb_nlmsg_size(struct net_bridge_port_group *pg) 457 { 458 size_t nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) + 459 nla_total_size(sizeof(struct br_mdb_entry)) + 460 nla_total_size(sizeof(u32)); 461 struct net_bridge_group_src *ent; 462 size_t addr_size = 0; 463 464 if (!pg) 465 goto out; 466 467 /* MDBA_MDB_EATTR_RTPROT */ 468 nlmsg_size += nla_total_size(sizeof(u8)); 469 470 switch (pg->key.addr.proto) { 471 case htons(ETH_P_IP): 472 /* MDBA_MDB_EATTR_SOURCE */ 473 if (pg->key.addr.src.ip4) 474 nlmsg_size += nla_total_size(sizeof(__be32)); 475 if (pg->key.port->br->multicast_ctx.multicast_igmp_version == 2) 476 goto out; 477 addr_size = sizeof(__be32); 478 break; 479 #if IS_ENABLED(CONFIG_IPV6) 480 case htons(ETH_P_IPV6): 481 /* MDBA_MDB_EATTR_SOURCE */ 482 if (!ipv6_addr_any(&pg->key.addr.src.ip6)) 483 nlmsg_size += nla_total_size(sizeof(struct in6_addr)); 484 if (pg->key.port->br->multicast_ctx.multicast_mld_version == 1) 485 goto out; 486 addr_size = sizeof(struct in6_addr); 487 break; 488 #endif 489 } 490 491 /* MDBA_MDB_EATTR_GROUP_MODE */ 492 nlmsg_size += nla_total_size(sizeof(u8)); 493 494 /* MDBA_MDB_EATTR_SRC_LIST nested attr */ 495 if (!hlist_empty(&pg->src_list)) 496 nlmsg_size += nla_total_size(0); 497 498 hlist_for_each_entry(ent, &pg->src_list, node) { 499 /* MDBA_MDB_SRCLIST_ENTRY nested attr + 500 * MDBA_MDB_SRCATTR_ADDRESS + MDBA_MDB_SRCATTR_TIMER 501 */ 502 nlmsg_size += nla_total_size(0) + 503 nla_total_size(addr_size) + 504 nla_total_size(sizeof(u32)); 505 } 506 out: 507 return nlmsg_size; 508 } 509 510 void br_mdb_notify(struct net_device *dev, 511 struct net_bridge_mdb_entry *mp, 512 struct net_bridge_port_group *pg, 513 int type) 514 { 515 struct net *net = dev_net(dev); 516 struct sk_buff *skb; 517 int err = -ENOBUFS; 518 519 br_switchdev_mdb_notify(dev, mp, pg, type); 520 521 skb = nlmsg_new(rtnl_mdb_nlmsg_size(pg), GFP_ATOMIC); 522 if (!skb) 523 goto errout; 524 525 err = nlmsg_populate_mdb_fill(skb, dev, mp, pg, type); 526 if (err < 0) { 527 kfree_skb(skb); 528 goto errout; 529 } 530 531 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); 532 return; 533 errout: 534 rtnl_set_sk_err(net, RTNLGRP_MDB, err); 535 } 536 537 static int nlmsg_populate_rtr_fill(struct sk_buff *skb, 538 struct net_device *dev, 539 int ifindex, u16 vid, u32 pid, 540 u32 seq, int type, unsigned int flags) 541 { 542 struct nlattr *nest, *port_nest; 543 struct br_port_msg *bpm; 544 struct nlmsghdr *nlh; 545 546 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0); 547 if (!nlh) 548 return -EMSGSIZE; 549 550 bpm = nlmsg_data(nlh); 551 memset(bpm, 0, sizeof(*bpm)); 552 bpm->family = AF_BRIDGE; 553 bpm->ifindex = dev->ifindex; 554 nest = nla_nest_start_noflag(skb, MDBA_ROUTER); 555 if (!nest) 556 goto cancel; 557 558 port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT); 559 if (!port_nest) 560 goto end; 561 if (nla_put_nohdr(skb, sizeof(u32), &ifindex)) { 562 nla_nest_cancel(skb, port_nest); 563 goto end; 564 } 565 if (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid)) { 566 nla_nest_cancel(skb, port_nest); 567 goto end; 568 } 569 nla_nest_end(skb, port_nest); 570 571 nla_nest_end(skb, nest); 572 nlmsg_end(skb, nlh); 573 return 0; 574 575 end: 576 nla_nest_end(skb, nest); 577 cancel: 578 nlmsg_cancel(skb, nlh); 579 return -EMSGSIZE; 580 } 581 582 static inline size_t rtnl_rtr_nlmsg_size(void) 583 { 584 return NLMSG_ALIGN(sizeof(struct br_port_msg)) 585 + nla_total_size(sizeof(__u32)) 586 + nla_total_size(sizeof(u16)); 587 } 588 589 void br_rtr_notify(struct net_device *dev, struct net_bridge_mcast_port *pmctx, 590 int type) 591 { 592 struct net *net = dev_net(dev); 593 struct sk_buff *skb; 594 int err = -ENOBUFS; 595 int ifindex; 596 u16 vid; 597 598 ifindex = pmctx ? pmctx->port->dev->ifindex : 0; 599 vid = pmctx && br_multicast_port_ctx_is_vlan(pmctx) ? pmctx->vlan->vid : 600 0; 601 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC); 602 if (!skb) 603 goto errout; 604 605 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, vid, 0, 0, type, 606 NTF_SELF); 607 if (err < 0) { 608 kfree_skb(skb); 609 goto errout; 610 } 611 612 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); 613 return; 614 615 errout: 616 rtnl_set_sk_err(net, RTNLGRP_MDB, err); 617 } 618 619 static const struct nla_policy 620 br_mdbe_src_list_entry_pol[MDBE_SRCATTR_MAX + 1] = { 621 [MDBE_SRCATTR_ADDRESS] = NLA_POLICY_RANGE(NLA_BINARY, 622 sizeof(struct in_addr), 623 sizeof(struct in6_addr)), 624 }; 625 626 static const struct nla_policy 627 br_mdbe_src_list_pol[MDBE_SRC_LIST_MAX + 1] = { 628 [MDBE_SRC_LIST_ENTRY] = NLA_POLICY_NESTED(br_mdbe_src_list_entry_pol), 629 }; 630 631 static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = { 632 [MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY, 633 sizeof(struct in_addr), 634 sizeof(struct in6_addr)), 635 [MDBE_ATTR_GROUP_MODE] = NLA_POLICY_RANGE(NLA_U8, MCAST_EXCLUDE, 636 MCAST_INCLUDE), 637 [MDBE_ATTR_SRC_LIST] = NLA_POLICY_NESTED(br_mdbe_src_list_pol), 638 [MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC), 639 }; 640 641 static bool is_valid_mdb_source(struct nlattr *attr, __be16 proto, 642 struct netlink_ext_ack *extack) 643 { 644 switch (proto) { 645 case htons(ETH_P_IP): 646 if (nla_len(attr) != sizeof(struct in_addr)) { 647 NL_SET_ERR_MSG_MOD(extack, "IPv4 invalid source address length"); 648 return false; 649 } 650 if (ipv4_is_multicast(nla_get_in_addr(attr))) { 651 NL_SET_ERR_MSG_MOD(extack, "IPv4 multicast source address is not allowed"); 652 return false; 653 } 654 break; 655 #if IS_ENABLED(CONFIG_IPV6) 656 case htons(ETH_P_IPV6): { 657 struct in6_addr src; 658 659 if (nla_len(attr) != sizeof(struct in6_addr)) { 660 NL_SET_ERR_MSG_MOD(extack, "IPv6 invalid source address length"); 661 return false; 662 } 663 src = nla_get_in6_addr(attr); 664 if (ipv6_addr_is_multicast(&src)) { 665 NL_SET_ERR_MSG_MOD(extack, "IPv6 multicast source address is not allowed"); 666 return false; 667 } 668 break; 669 } 670 #endif 671 default: 672 NL_SET_ERR_MSG_MOD(extack, "Invalid protocol used with source address"); 673 return false; 674 } 675 676 return true; 677 } 678 679 static struct net_bridge_mcast * 680 __br_mdb_choose_context(struct net_bridge *br, 681 const struct br_mdb_entry *entry, 682 struct netlink_ext_ack *extack) 683 { 684 struct net_bridge_mcast *brmctx = NULL; 685 struct net_bridge_vlan *v; 686 687 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 688 brmctx = &br->multicast_ctx; 689 goto out; 690 } 691 692 if (!entry->vid) { 693 NL_SET_ERR_MSG_MOD(extack, "Cannot add an entry without a vlan when vlan snooping is enabled"); 694 goto out; 695 } 696 697 v = br_vlan_find(br_vlan_group(br), entry->vid); 698 if (!v) { 699 NL_SET_ERR_MSG_MOD(extack, "Vlan is not configured"); 700 goto out; 701 } 702 if (br_multicast_ctx_vlan_global_disabled(&v->br_mcast_ctx)) { 703 NL_SET_ERR_MSG_MOD(extack, "Vlan's multicast processing is disabled"); 704 goto out; 705 } 706 brmctx = &v->br_mcast_ctx; 707 out: 708 return brmctx; 709 } 710 711 static int br_mdb_replace_group_sg(const struct br_mdb_config *cfg, 712 struct net_bridge_mdb_entry *mp, 713 struct net_bridge_port_group *pg, 714 struct net_bridge_mcast *brmctx, 715 unsigned char flags) 716 { 717 unsigned long now = jiffies; 718 719 pg->flags = flags; 720 pg->rt_protocol = cfg->rt_protocol; 721 if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry) 722 mod_timer(&pg->timer, 723 now + brmctx->multicast_membership_interval); 724 else 725 del_timer(&pg->timer); 726 727 br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB); 728 729 return 0; 730 } 731 732 static int br_mdb_add_group_sg(const struct br_mdb_config *cfg, 733 struct net_bridge_mdb_entry *mp, 734 struct net_bridge_mcast *brmctx, 735 unsigned char flags, 736 struct netlink_ext_ack *extack) 737 { 738 struct net_bridge_port_group __rcu **pp; 739 struct net_bridge_port_group *p; 740 unsigned long now = jiffies; 741 742 for (pp = &mp->ports; 743 (p = mlock_dereference(*pp, cfg->br)) != NULL; 744 pp = &p->next) { 745 if (p->key.port == cfg->p) { 746 if (!(cfg->nlflags & NLM_F_REPLACE)) { 747 NL_SET_ERR_MSG_MOD(extack, "(S, G) group is already joined by port"); 748 return -EEXIST; 749 } 750 return br_mdb_replace_group_sg(cfg, mp, p, brmctx, 751 flags); 752 } 753 if ((unsigned long)p->key.port < (unsigned long)cfg->p) 754 break; 755 } 756 757 p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL, 758 MCAST_INCLUDE, cfg->rt_protocol, extack); 759 if (unlikely(!p)) 760 return -ENOMEM; 761 762 rcu_assign_pointer(*pp, p); 763 if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry) 764 mod_timer(&p->timer, 765 now + brmctx->multicast_membership_interval); 766 br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB); 767 768 /* All of (*, G) EXCLUDE ports need to be added to the new (S, G) for 769 * proper replication. 770 */ 771 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto)) { 772 struct net_bridge_mdb_entry *star_mp; 773 struct br_ip star_group; 774 775 star_group = p->key.addr; 776 memset(&star_group.src, 0, sizeof(star_group.src)); 777 star_mp = br_mdb_ip_get(cfg->br, &star_group); 778 if (star_mp) 779 br_multicast_sg_add_exclude_ports(star_mp, p); 780 } 781 782 return 0; 783 } 784 785 static int br_mdb_add_group_src_fwd(const struct br_mdb_config *cfg, 786 struct br_ip *src_ip, 787 struct net_bridge_mcast *brmctx, 788 struct netlink_ext_ack *extack) 789 { 790 struct net_bridge_mdb_entry *sgmp; 791 struct br_mdb_config sg_cfg; 792 struct br_ip sg_ip; 793 u8 flags = 0; 794 795 sg_ip = cfg->group; 796 sg_ip.src = src_ip->src; 797 sgmp = br_multicast_new_group(cfg->br, &sg_ip); 798 if (IS_ERR(sgmp)) { 799 NL_SET_ERR_MSG_MOD(extack, "Failed to add (S, G) MDB entry"); 800 return PTR_ERR(sgmp); 801 } 802 803 if (cfg->entry->state == MDB_PERMANENT) 804 flags |= MDB_PG_FLAGS_PERMANENT; 805 if (cfg->filter_mode == MCAST_EXCLUDE) 806 flags |= MDB_PG_FLAGS_BLOCKED; 807 808 memset(&sg_cfg, 0, sizeof(sg_cfg)); 809 sg_cfg.br = cfg->br; 810 sg_cfg.p = cfg->p; 811 sg_cfg.entry = cfg->entry; 812 sg_cfg.group = sg_ip; 813 sg_cfg.src_entry = true; 814 sg_cfg.filter_mode = MCAST_INCLUDE; 815 sg_cfg.rt_protocol = cfg->rt_protocol; 816 sg_cfg.nlflags = cfg->nlflags; 817 return br_mdb_add_group_sg(&sg_cfg, sgmp, brmctx, flags, extack); 818 } 819 820 static int br_mdb_add_group_src(const struct br_mdb_config *cfg, 821 struct net_bridge_port_group *pg, 822 struct net_bridge_mcast *brmctx, 823 struct br_mdb_src_entry *src, 824 struct netlink_ext_ack *extack) 825 { 826 struct net_bridge_group_src *ent; 827 unsigned long now = jiffies; 828 int err; 829 830 ent = br_multicast_find_group_src(pg, &src->addr); 831 if (!ent) { 832 ent = br_multicast_new_group_src(pg, &src->addr); 833 if (!ent) { 834 NL_SET_ERR_MSG_MOD(extack, "Failed to add new source entry"); 835 return -ENOSPC; 836 } 837 } else if (!(cfg->nlflags & NLM_F_REPLACE)) { 838 NL_SET_ERR_MSG_MOD(extack, "Source entry already exists"); 839 return -EEXIST; 840 } 841 842 if (cfg->filter_mode == MCAST_INCLUDE && 843 cfg->entry->state == MDB_TEMPORARY) 844 mod_timer(&ent->timer, now + br_multicast_gmi(brmctx)); 845 else 846 del_timer(&ent->timer); 847 848 /* Install a (S, G) forwarding entry for the source. */ 849 err = br_mdb_add_group_src_fwd(cfg, &src->addr, brmctx, extack); 850 if (err) 851 goto err_del_sg; 852 853 ent->flags = BR_SGRP_F_INSTALLED | BR_SGRP_F_USER_ADDED; 854 855 return 0; 856 857 err_del_sg: 858 __br_multicast_del_group_src(ent); 859 return err; 860 } 861 862 static void br_mdb_del_group_src(struct net_bridge_port_group *pg, 863 struct br_mdb_src_entry *src) 864 { 865 struct net_bridge_group_src *ent; 866 867 ent = br_multicast_find_group_src(pg, &src->addr); 868 if (WARN_ON_ONCE(!ent)) 869 return; 870 br_multicast_del_group_src(ent, false); 871 } 872 873 static int br_mdb_add_group_srcs(const struct br_mdb_config *cfg, 874 struct net_bridge_port_group *pg, 875 struct net_bridge_mcast *brmctx, 876 struct netlink_ext_ack *extack) 877 { 878 int i, err; 879 880 for (i = 0; i < cfg->num_src_entries; i++) { 881 err = br_mdb_add_group_src(cfg, pg, brmctx, 882 &cfg->src_entries[i], extack); 883 if (err) 884 goto err_del_group_srcs; 885 } 886 887 return 0; 888 889 err_del_group_srcs: 890 for (i--; i >= 0; i--) 891 br_mdb_del_group_src(pg, &cfg->src_entries[i]); 892 return err; 893 } 894 895 static int br_mdb_replace_group_srcs(const struct br_mdb_config *cfg, 896 struct net_bridge_port_group *pg, 897 struct net_bridge_mcast *brmctx, 898 struct netlink_ext_ack *extack) 899 { 900 struct net_bridge_group_src *ent; 901 struct hlist_node *tmp; 902 int err; 903 904 hlist_for_each_entry(ent, &pg->src_list, node) 905 ent->flags |= BR_SGRP_F_DELETE; 906 907 err = br_mdb_add_group_srcs(cfg, pg, brmctx, extack); 908 if (err) 909 goto err_clear_delete; 910 911 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) { 912 if (ent->flags & BR_SGRP_F_DELETE) 913 br_multicast_del_group_src(ent, false); 914 } 915 916 return 0; 917 918 err_clear_delete: 919 hlist_for_each_entry(ent, &pg->src_list, node) 920 ent->flags &= ~BR_SGRP_F_DELETE; 921 return err; 922 } 923 924 static int br_mdb_replace_group_star_g(const struct br_mdb_config *cfg, 925 struct net_bridge_mdb_entry *mp, 926 struct net_bridge_port_group *pg, 927 struct net_bridge_mcast *brmctx, 928 unsigned char flags, 929 struct netlink_ext_ack *extack) 930 { 931 unsigned long now = jiffies; 932 int err; 933 934 err = br_mdb_replace_group_srcs(cfg, pg, brmctx, extack); 935 if (err) 936 return err; 937 938 pg->flags = flags; 939 pg->filter_mode = cfg->filter_mode; 940 pg->rt_protocol = cfg->rt_protocol; 941 if (!(flags & MDB_PG_FLAGS_PERMANENT) && 942 cfg->filter_mode == MCAST_EXCLUDE) 943 mod_timer(&pg->timer, 944 now + brmctx->multicast_membership_interval); 945 else 946 del_timer(&pg->timer); 947 948 br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB); 949 950 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto)) 951 br_multicast_star_g_handle_mode(pg, cfg->filter_mode); 952 953 return 0; 954 } 955 956 static int br_mdb_add_group_star_g(const struct br_mdb_config *cfg, 957 struct net_bridge_mdb_entry *mp, 958 struct net_bridge_mcast *brmctx, 959 unsigned char flags, 960 struct netlink_ext_ack *extack) 961 { 962 struct net_bridge_port_group __rcu **pp; 963 struct net_bridge_port_group *p; 964 unsigned long now = jiffies; 965 int err; 966 967 for (pp = &mp->ports; 968 (p = mlock_dereference(*pp, cfg->br)) != NULL; 969 pp = &p->next) { 970 if (p->key.port == cfg->p) { 971 if (!(cfg->nlflags & NLM_F_REPLACE)) { 972 NL_SET_ERR_MSG_MOD(extack, "(*, G) group is already joined by port"); 973 return -EEXIST; 974 } 975 return br_mdb_replace_group_star_g(cfg, mp, p, brmctx, 976 flags, extack); 977 } 978 if ((unsigned long)p->key.port < (unsigned long)cfg->p) 979 break; 980 } 981 982 p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL, 983 cfg->filter_mode, cfg->rt_protocol, 984 extack); 985 if (unlikely(!p)) 986 return -ENOMEM; 987 988 err = br_mdb_add_group_srcs(cfg, p, brmctx, extack); 989 if (err) 990 goto err_del_port_group; 991 992 rcu_assign_pointer(*pp, p); 993 if (!(flags & MDB_PG_FLAGS_PERMANENT) && 994 cfg->filter_mode == MCAST_EXCLUDE) 995 mod_timer(&p->timer, 996 now + brmctx->multicast_membership_interval); 997 br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB); 998 /* If we are adding a new EXCLUDE port group (*, G), it needs to be 999 * also added to all (S, G) entries for proper replication. 1000 */ 1001 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto) && 1002 cfg->filter_mode == MCAST_EXCLUDE) 1003 br_multicast_star_g_handle_mode(p, MCAST_EXCLUDE); 1004 1005 return 0; 1006 1007 err_del_port_group: 1008 br_multicast_del_port_group(p); 1009 return err; 1010 } 1011 1012 static int br_mdb_add_group(const struct br_mdb_config *cfg, 1013 struct netlink_ext_ack *extack) 1014 { 1015 struct br_mdb_entry *entry = cfg->entry; 1016 struct net_bridge_port *port = cfg->p; 1017 struct net_bridge_mdb_entry *mp; 1018 struct net_bridge *br = cfg->br; 1019 struct net_bridge_mcast *brmctx; 1020 struct br_ip group = cfg->group; 1021 unsigned char flags = 0; 1022 1023 brmctx = __br_mdb_choose_context(br, entry, extack); 1024 if (!brmctx) 1025 return -EINVAL; 1026 1027 mp = br_multicast_new_group(br, &group); 1028 if (IS_ERR(mp)) 1029 return PTR_ERR(mp); 1030 1031 /* host join */ 1032 if (!port) { 1033 if (mp->host_joined) { 1034 NL_SET_ERR_MSG_MOD(extack, "Group is already joined by host"); 1035 return -EEXIST; 1036 } 1037 1038 br_multicast_host_join(brmctx, mp, false); 1039 br_mdb_notify(br->dev, mp, NULL, RTM_NEWMDB); 1040 1041 return 0; 1042 } 1043 1044 if (entry->state == MDB_PERMANENT) 1045 flags |= MDB_PG_FLAGS_PERMANENT; 1046 1047 if (br_multicast_is_star_g(&group)) 1048 return br_mdb_add_group_star_g(cfg, mp, brmctx, flags, extack); 1049 else 1050 return br_mdb_add_group_sg(cfg, mp, brmctx, flags, extack); 1051 } 1052 1053 static int __br_mdb_add(const struct br_mdb_config *cfg, 1054 struct netlink_ext_ack *extack) 1055 { 1056 int ret; 1057 1058 spin_lock_bh(&cfg->br->multicast_lock); 1059 ret = br_mdb_add_group(cfg, extack); 1060 spin_unlock_bh(&cfg->br->multicast_lock); 1061 1062 return ret; 1063 } 1064 1065 static int br_mdb_config_src_entry_init(struct nlattr *src_entry, 1066 struct br_mdb_src_entry *src, 1067 __be16 proto, 1068 struct netlink_ext_ack *extack) 1069 { 1070 struct nlattr *tb[MDBE_SRCATTR_MAX + 1]; 1071 int err; 1072 1073 err = nla_parse_nested(tb, MDBE_SRCATTR_MAX, src_entry, 1074 br_mdbe_src_list_entry_pol, extack); 1075 if (err) 1076 return err; 1077 1078 if (NL_REQ_ATTR_CHECK(extack, src_entry, tb, MDBE_SRCATTR_ADDRESS)) 1079 return -EINVAL; 1080 1081 if (!is_valid_mdb_source(tb[MDBE_SRCATTR_ADDRESS], proto, extack)) 1082 return -EINVAL; 1083 1084 src->addr.proto = proto; 1085 nla_memcpy(&src->addr.src, tb[MDBE_SRCATTR_ADDRESS], 1086 nla_len(tb[MDBE_SRCATTR_ADDRESS])); 1087 1088 return 0; 1089 } 1090 1091 static int br_mdb_config_src_list_init(struct nlattr *src_list, 1092 struct br_mdb_config *cfg, 1093 struct netlink_ext_ack *extack) 1094 { 1095 struct nlattr *src_entry; 1096 int rem, err; 1097 int i = 0; 1098 1099 nla_for_each_nested(src_entry, src_list, rem) 1100 cfg->num_src_entries++; 1101 1102 if (cfg->num_src_entries >= PG_SRC_ENT_LIMIT) { 1103 NL_SET_ERR_MSG_FMT_MOD(extack, "Exceeded maximum number of source entries (%u)", 1104 PG_SRC_ENT_LIMIT - 1); 1105 return -EINVAL; 1106 } 1107 1108 cfg->src_entries = kcalloc(cfg->num_src_entries, 1109 sizeof(struct br_mdb_src_entry), GFP_KERNEL); 1110 if (!cfg->src_entries) 1111 return -ENOMEM; 1112 1113 nla_for_each_nested(src_entry, src_list, rem) { 1114 err = br_mdb_config_src_entry_init(src_entry, 1115 &cfg->src_entries[i], 1116 cfg->entry->addr.proto, 1117 extack); 1118 if (err) 1119 goto err_src_entry_init; 1120 i++; 1121 } 1122 1123 return 0; 1124 1125 err_src_entry_init: 1126 kfree(cfg->src_entries); 1127 return err; 1128 } 1129 1130 static void br_mdb_config_src_list_fini(struct br_mdb_config *cfg) 1131 { 1132 kfree(cfg->src_entries); 1133 } 1134 1135 static int br_mdb_config_attrs_init(struct nlattr *set_attrs, 1136 struct br_mdb_config *cfg, 1137 struct netlink_ext_ack *extack) 1138 { 1139 struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1]; 1140 int err; 1141 1142 err = nla_parse_nested(mdb_attrs, MDBE_ATTR_MAX, set_attrs, 1143 br_mdbe_attrs_pol, extack); 1144 if (err) 1145 return err; 1146 1147 if (mdb_attrs[MDBE_ATTR_SOURCE] && 1148 !is_valid_mdb_source(mdb_attrs[MDBE_ATTR_SOURCE], 1149 cfg->entry->addr.proto, extack)) 1150 return -EINVAL; 1151 1152 __mdb_entry_to_br_ip(cfg->entry, &cfg->group, mdb_attrs); 1153 1154 if (mdb_attrs[MDBE_ATTR_GROUP_MODE]) { 1155 if (!cfg->p) { 1156 NL_SET_ERR_MSG_MOD(extack, "Filter mode cannot be set for host groups"); 1157 return -EINVAL; 1158 } 1159 if (!br_multicast_is_star_g(&cfg->group)) { 1160 NL_SET_ERR_MSG_MOD(extack, "Filter mode can only be set for (*, G) entries"); 1161 return -EINVAL; 1162 } 1163 cfg->filter_mode = nla_get_u8(mdb_attrs[MDBE_ATTR_GROUP_MODE]); 1164 } else { 1165 cfg->filter_mode = MCAST_EXCLUDE; 1166 } 1167 1168 if (mdb_attrs[MDBE_ATTR_SRC_LIST]) { 1169 if (!cfg->p) { 1170 NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set for host groups"); 1171 return -EINVAL; 1172 } 1173 if (!br_multicast_is_star_g(&cfg->group)) { 1174 NL_SET_ERR_MSG_MOD(extack, "Source list can only be set for (*, G) entries"); 1175 return -EINVAL; 1176 } 1177 if (!mdb_attrs[MDBE_ATTR_GROUP_MODE]) { 1178 NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set without filter mode"); 1179 return -EINVAL; 1180 } 1181 err = br_mdb_config_src_list_init(mdb_attrs[MDBE_ATTR_SRC_LIST], 1182 cfg, extack); 1183 if (err) 1184 return err; 1185 } 1186 1187 if (!cfg->num_src_entries && cfg->filter_mode == MCAST_INCLUDE) { 1188 NL_SET_ERR_MSG_MOD(extack, "Cannot add (*, G) INCLUDE with an empty source list"); 1189 return -EINVAL; 1190 } 1191 1192 if (mdb_attrs[MDBE_ATTR_RTPROT]) { 1193 if (!cfg->p) { 1194 NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be set for host groups"); 1195 return -EINVAL; 1196 } 1197 cfg->rt_protocol = nla_get_u8(mdb_attrs[MDBE_ATTR_RTPROT]); 1198 } 1199 1200 return 0; 1201 } 1202 1203 static int br_mdb_config_init(struct br_mdb_config *cfg, struct net_device *dev, 1204 struct nlattr *tb[], u16 nlmsg_flags, 1205 struct netlink_ext_ack *extack) 1206 { 1207 struct net *net = dev_net(dev); 1208 1209 memset(cfg, 0, sizeof(*cfg)); 1210 cfg->filter_mode = MCAST_EXCLUDE; 1211 cfg->rt_protocol = RTPROT_STATIC; 1212 cfg->nlflags = nlmsg_flags; 1213 1214 cfg->br = netdev_priv(dev); 1215 1216 if (!netif_running(cfg->br->dev)) { 1217 NL_SET_ERR_MSG_MOD(extack, "Bridge device is not running"); 1218 return -EINVAL; 1219 } 1220 1221 if (!br_opt_get(cfg->br, BROPT_MULTICAST_ENABLED)) { 1222 NL_SET_ERR_MSG_MOD(extack, "Bridge's multicast processing is disabled"); 1223 return -EINVAL; 1224 } 1225 1226 cfg->entry = nla_data(tb[MDBA_SET_ENTRY]); 1227 1228 if (cfg->entry->ifindex != cfg->br->dev->ifindex) { 1229 struct net_device *pdev; 1230 1231 pdev = __dev_get_by_index(net, cfg->entry->ifindex); 1232 if (!pdev) { 1233 NL_SET_ERR_MSG_MOD(extack, "Port net device doesn't exist"); 1234 return -ENODEV; 1235 } 1236 1237 cfg->p = br_port_get_rtnl(pdev); 1238 if (!cfg->p) { 1239 NL_SET_ERR_MSG_MOD(extack, "Net device is not a bridge port"); 1240 return -EINVAL; 1241 } 1242 1243 if (cfg->p->br != cfg->br) { 1244 NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device"); 1245 return -EINVAL; 1246 } 1247 } 1248 1249 if (cfg->entry->addr.proto == htons(ETH_P_IP) && 1250 ipv4_is_zeronet(cfg->entry->addr.u.ip4)) { 1251 NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address 0.0.0.0 is not allowed"); 1252 return -EINVAL; 1253 } 1254 1255 if (tb[MDBA_SET_ENTRY_ATTRS]) 1256 return br_mdb_config_attrs_init(tb[MDBA_SET_ENTRY_ATTRS], cfg, 1257 extack); 1258 else 1259 __mdb_entry_to_br_ip(cfg->entry, &cfg->group, NULL); 1260 1261 return 0; 1262 } 1263 1264 static void br_mdb_config_fini(struct br_mdb_config *cfg) 1265 { 1266 br_mdb_config_src_list_fini(cfg); 1267 } 1268 1269 int br_mdb_add(struct net_device *dev, struct nlattr *tb[], u16 nlmsg_flags, 1270 struct netlink_ext_ack *extack) 1271 { 1272 struct net_bridge_vlan_group *vg; 1273 struct net_bridge_vlan *v; 1274 struct br_mdb_config cfg; 1275 int err; 1276 1277 err = br_mdb_config_init(&cfg, dev, tb, nlmsg_flags, extack); 1278 if (err) 1279 return err; 1280 1281 err = -EINVAL; 1282 /* host join errors which can happen before creating the group */ 1283 if (!cfg.p && !br_group_is_l2(&cfg.group)) { 1284 /* don't allow any flags for host-joined IP groups */ 1285 if (cfg.entry->state) { 1286 NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups"); 1287 goto out; 1288 } 1289 if (!br_multicast_is_star_g(&cfg.group)) { 1290 NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined"); 1291 goto out; 1292 } 1293 } 1294 1295 if (br_group_is_l2(&cfg.group) && cfg.entry->state != MDB_PERMANENT) { 1296 NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed"); 1297 goto out; 1298 } 1299 1300 if (cfg.p) { 1301 if (cfg.p->state == BR_STATE_DISABLED && cfg.entry->state != MDB_PERMANENT) { 1302 NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state and entry is not permanent"); 1303 goto out; 1304 } 1305 vg = nbp_vlan_group(cfg.p); 1306 } else { 1307 vg = br_vlan_group(cfg.br); 1308 } 1309 1310 /* If vlan filtering is enabled and VLAN is not specified 1311 * install mdb entry on all vlans configured on the port. 1312 */ 1313 if (br_vlan_enabled(cfg.br->dev) && vg && cfg.entry->vid == 0) { 1314 list_for_each_entry(v, &vg->vlan_list, vlist) { 1315 cfg.entry->vid = v->vid; 1316 cfg.group.vid = v->vid; 1317 err = __br_mdb_add(&cfg, extack); 1318 if (err) 1319 break; 1320 } 1321 } else { 1322 err = __br_mdb_add(&cfg, extack); 1323 } 1324 1325 out: 1326 br_mdb_config_fini(&cfg); 1327 return err; 1328 } 1329 1330 static int __br_mdb_del(const struct br_mdb_config *cfg) 1331 { 1332 struct br_mdb_entry *entry = cfg->entry; 1333 struct net_bridge *br = cfg->br; 1334 struct net_bridge_mdb_entry *mp; 1335 struct net_bridge_port_group *p; 1336 struct net_bridge_port_group __rcu **pp; 1337 struct br_ip ip = cfg->group; 1338 int err = -EINVAL; 1339 1340 spin_lock_bh(&br->multicast_lock); 1341 mp = br_mdb_ip_get(br, &ip); 1342 if (!mp) 1343 goto unlock; 1344 1345 /* host leave */ 1346 if (entry->ifindex == mp->br->dev->ifindex && mp->host_joined) { 1347 br_multicast_host_leave(mp, false); 1348 err = 0; 1349 br_mdb_notify(br->dev, mp, NULL, RTM_DELMDB); 1350 if (!mp->ports && netif_running(br->dev)) 1351 mod_timer(&mp->timer, jiffies); 1352 goto unlock; 1353 } 1354 1355 for (pp = &mp->ports; 1356 (p = mlock_dereference(*pp, br)) != NULL; 1357 pp = &p->next) { 1358 if (!p->key.port || p->key.port->dev->ifindex != entry->ifindex) 1359 continue; 1360 1361 br_multicast_del_pg(mp, p, pp); 1362 err = 0; 1363 break; 1364 } 1365 1366 unlock: 1367 spin_unlock_bh(&br->multicast_lock); 1368 return err; 1369 } 1370 1371 int br_mdb_del(struct net_device *dev, struct nlattr *tb[], 1372 struct netlink_ext_ack *extack) 1373 { 1374 struct net_bridge_vlan_group *vg; 1375 struct net_bridge_vlan *v; 1376 struct br_mdb_config cfg; 1377 int err; 1378 1379 err = br_mdb_config_init(&cfg, dev, tb, 0, extack); 1380 if (err) 1381 return err; 1382 1383 if (cfg.p) 1384 vg = nbp_vlan_group(cfg.p); 1385 else 1386 vg = br_vlan_group(cfg.br); 1387 1388 /* If vlan filtering is enabled and VLAN is not specified 1389 * delete mdb entry on all vlans configured on the port. 1390 */ 1391 if (br_vlan_enabled(cfg.br->dev) && vg && cfg.entry->vid == 0) { 1392 list_for_each_entry(v, &vg->vlan_list, vlist) { 1393 cfg.entry->vid = v->vid; 1394 cfg.group.vid = v->vid; 1395 err = __br_mdb_del(&cfg); 1396 } 1397 } else { 1398 err = __br_mdb_del(&cfg); 1399 } 1400 1401 br_mdb_config_fini(&cfg); 1402 return err; 1403 } 1404