1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Multicast support for IPv6 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 10 */ 11 12 /* Changes: 13 * 14 * yoshfuji : fix format of router-alert option 15 * YOSHIFUJI Hideaki @USAGI: 16 * Fixed source address for MLD message based on 17 * <draft-ietf-magma-mld-source-05.txt>. 18 * YOSHIFUJI Hideaki @USAGI: 19 * - Ignore Queries for invalid addresses. 20 * - MLD for link-local addresses. 21 * David L Stevens <dlstevens@us.ibm.com>: 22 * - MLDv2 support 23 */ 24 25 #include <linux/module.h> 26 #include <linux/errno.h> 27 #include <linux/types.h> 28 #include <linux/string.h> 29 #include <linux/socket.h> 30 #include <linux/sockios.h> 31 #include <linux/jiffies.h> 32 #include <linux/net.h> 33 #include <linux/in.h> 34 #include <linux/in6.h> 35 #include <linux/netdevice.h> 36 #include <linux/if_addr.h> 37 #include <linux/if_arp.h> 38 #include <linux/route.h> 39 #include <linux/rtnetlink.h> 40 #include <linux/init.h> 41 #include <linux/proc_fs.h> 42 #include <linux/seq_file.h> 43 #include <linux/slab.h> 44 #include <linux/pkt_sched.h> 45 #include <net/mld.h> 46 #include <linux/workqueue.h> 47 48 #include <linux/netfilter.h> 49 #include <linux/netfilter_ipv6.h> 50 51 #include <net/net_namespace.h> 52 #include <net/netlink.h> 53 #include <net/sock.h> 54 #include <net/snmp.h> 55 56 #include <net/ipv6.h> 57 #include <net/protocol.h> 58 #include <net/if_inet6.h> 59 #include <net/ndisc.h> 60 #include <net/addrconf.h> 61 #include <net/ip6_route.h> 62 #include <net/inet_common.h> 63 64 #include <net/ip6_checksum.h> 65 66 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 67 static int __mld2_query_bugs[] __attribute__((__unused__)) = { 68 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4), 69 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4), 70 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4) 71 }; 72 73 static struct workqueue_struct *mld_wq; 74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 75 76 static void igmp6_join_group(struct ifmcaddr6 *ma); 77 static void igmp6_leave_group(struct ifmcaddr6 *ma); 78 static void mld_mca_work(struct work_struct *work); 79 80 static void mld_ifc_event(struct inet6_dev *idev); 81 static bool mld_in_v1_mode(const struct inet6_dev *idev); 82 static int sf_setstate(struct ifmcaddr6 *pmc); 83 static void sf_markstate(struct ifmcaddr6 *pmc); 84 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 85 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 86 int sfmode, int sfcount, const struct in6_addr *psfsrc, 87 int delta); 88 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 89 int sfmode, int sfcount, const struct in6_addr *psfsrc, 90 int delta); 91 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 92 struct inet6_dev *idev); 93 static int __ipv6_dev_mc_inc(struct net_device *dev, 94 const struct in6_addr *addr, unsigned int mode); 95 96 #define MLD_QRV_DEFAULT 2 97 /* RFC3810, 9.2. Query Interval */ 98 #define MLD_QI_DEFAULT (125 * HZ) 99 /* RFC3810, 9.3. Query Response Interval */ 100 #define MLD_QRI_DEFAULT (10 * HZ) 101 102 /* RFC3810, 8.1 Query Version Distinctions */ 103 #define MLD_V1_QUERY_LEN 24 104 #define MLD_V2_QUERY_LEN_MIN 28 105 106 #define IPV6_MLD_MAX_MSF 64 107 108 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 109 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; 110 111 #define mc_assert_locked(idev) \ 112 lockdep_assert_held(&(idev)->mc_lock) 113 114 #define mc_dereference(e, idev) \ 115 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock)) 116 117 #define sock_dereference(e, sk) \ 118 rcu_dereference_protected(e, lockdep_sock_is_held(sk)) 119 120 #define for_each_pmc_socklock(np, sk, pmc) \ 121 for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \ 122 pmc; \ 123 pmc = sock_dereference(pmc->next, sk)) 124 125 #define for_each_pmc_rcu(np, pmc) \ 126 for (pmc = rcu_dereference((np)->ipv6_mc_list); \ 127 pmc; \ 128 pmc = rcu_dereference(pmc->next)) 129 130 #define for_each_psf_mclock(mc, psf) \ 131 for (psf = mc_dereference((mc)->mca_sources, mc->idev); \ 132 psf; \ 133 psf = mc_dereference(psf->sf_next, mc->idev)) 134 135 #define for_each_psf_rcu(mc, psf) \ 136 for (psf = rcu_dereference((mc)->mca_sources); \ 137 psf; \ 138 psf = rcu_dereference(psf->sf_next)) 139 140 #define for_each_psf_tomb(mc, psf) \ 141 for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \ 142 psf; \ 143 psf = mc_dereference(psf->sf_next, mc->idev)) 144 145 #define for_each_mc_mclock(idev, mc) \ 146 for (mc = mc_dereference((idev)->mc_list, idev); \ 147 mc; \ 148 mc = mc_dereference(mc->next, idev)) 149 150 #define for_each_mc_rcu(idev, mc) \ 151 for (mc = rcu_dereference((idev)->mc_list); \ 152 mc; \ 153 mc = rcu_dereference(mc->next)) 154 155 #define for_each_mc_tomb(idev, mc) \ 156 for (mc = mc_dereference((idev)->mc_tomb, idev); \ 157 mc; \ 158 mc = mc_dereference(mc->next, idev)) 159 160 static int unsolicited_report_interval(struct inet6_dev *idev) 161 { 162 int iv; 163 164 if (mld_in_v1_mode(idev)) 165 iv = READ_ONCE(idev->cnf.mldv1_unsolicited_report_interval); 166 else 167 iv = READ_ONCE(idev->cnf.mldv2_unsolicited_report_interval); 168 169 return iv > 0 ? iv : 1; 170 } 171 172 static struct net_device *ip6_mc_find_dev(struct net *net, 173 const struct in6_addr *group, 174 int ifindex) 175 { 176 struct net_device *dev = NULL; 177 struct rt6_info *rt; 178 179 if (ifindex == 0) { 180 rcu_read_lock(); 181 rt = rt6_lookup(net, group, NULL, 0, NULL, 0); 182 if (rt) { 183 dev = dst_dev_rcu(&rt->dst); 184 dev_hold(dev); 185 ip6_rt_put(rt); 186 } 187 rcu_read_unlock(); 188 } else { 189 dev = dev_get_by_index(net, ifindex); 190 } 191 192 return dev; 193 } 194 195 /* 196 * socket join on multicast group 197 */ 198 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, 199 const struct in6_addr *addr, unsigned int mode) 200 { 201 struct ipv6_pinfo *np = inet6_sk(sk); 202 struct ipv6_mc_socklist *mc_lst; 203 struct net *net = sock_net(sk); 204 struct net_device *dev = NULL; 205 int err; 206 207 if (!ipv6_addr_is_multicast(addr)) 208 return -EINVAL; 209 210 for_each_pmc_socklock(np, sk, mc_lst) { 211 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 212 ipv6_addr_equal(&mc_lst->addr, addr)) 213 return -EADDRINUSE; 214 } 215 216 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 217 if (!mc_lst) 218 return -ENOMEM; 219 220 mc_lst->next = NULL; 221 mc_lst->addr = *addr; 222 223 dev = ip6_mc_find_dev(net, addr, ifindex); 224 if (!dev) { 225 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 226 return -ENODEV; 227 } 228 229 mc_lst->ifindex = dev->ifindex; 230 mc_lst->sfmode = mode; 231 RCU_INIT_POINTER(mc_lst->sflist, NULL); 232 233 /* now add/increase the group membership on the device */ 234 err = __ipv6_dev_mc_inc(dev, addr, mode); 235 236 dev_put(dev); 237 238 if (err) { 239 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 240 return err; 241 } 242 243 mc_lst->next = np->ipv6_mc_list; 244 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 245 246 return 0; 247 } 248 249 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 250 { 251 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 252 } 253 EXPORT_SYMBOL(ipv6_sock_mc_join); 254 255 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 256 const struct in6_addr *addr, unsigned int mode) 257 { 258 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 259 } 260 261 /* 262 * socket leave on multicast group 263 */ 264 static void __ipv6_sock_mc_drop(struct sock *sk, struct ipv6_mc_socklist *mc_lst) 265 { 266 struct net *net = sock_net(sk); 267 struct net_device *dev; 268 269 dev = dev_get_by_index(net, mc_lst->ifindex); 270 if (dev) { 271 struct inet6_dev *idev = in6_dev_get(dev); 272 273 ip6_mc_leave_src(sk, mc_lst, idev); 274 275 if (idev) { 276 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 277 in6_dev_put(idev); 278 } 279 280 dev_put(dev); 281 } else { 282 ip6_mc_leave_src(sk, mc_lst, NULL); 283 } 284 285 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 286 kfree_rcu(mc_lst, rcu); 287 } 288 289 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 290 { 291 struct ipv6_pinfo *np = inet6_sk(sk); 292 struct ipv6_mc_socklist __rcu **lnk; 293 struct ipv6_mc_socklist *mc_lst; 294 295 if (!ipv6_addr_is_multicast(addr)) 296 return -EINVAL; 297 298 for (lnk = &np->ipv6_mc_list; 299 (mc_lst = sock_dereference(*lnk, sk)) != NULL; 300 lnk = &mc_lst->next) { 301 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 302 ipv6_addr_equal(&mc_lst->addr, addr)) { 303 *lnk = mc_lst->next; 304 __ipv6_sock_mc_drop(sk, mc_lst); 305 return 0; 306 } 307 } 308 309 return -EADDRNOTAVAIL; 310 } 311 EXPORT_SYMBOL(ipv6_sock_mc_drop); 312 313 static struct inet6_dev *ip6_mc_find_idev(struct net *net, 314 const struct in6_addr *group, 315 int ifindex) 316 { 317 struct net_device *dev; 318 struct inet6_dev *idev; 319 320 dev = ip6_mc_find_dev(net, group, ifindex); 321 if (!dev) 322 return NULL; 323 324 idev = in6_dev_get(dev); 325 dev_put(dev); 326 327 return idev; 328 } 329 330 void __ipv6_sock_mc_close(struct sock *sk) 331 { 332 struct ipv6_pinfo *np = inet6_sk(sk); 333 struct ipv6_mc_socklist *mc_lst; 334 335 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) { 336 np->ipv6_mc_list = mc_lst->next; 337 __ipv6_sock_mc_drop(sk, mc_lst); 338 } 339 } 340 341 void ipv6_sock_mc_close(struct sock *sk) 342 { 343 struct ipv6_pinfo *np = inet6_sk(sk); 344 345 if (!rcu_access_pointer(np->ipv6_mc_list)) 346 return; 347 348 lock_sock(sk); 349 __ipv6_sock_mc_close(sk); 350 release_sock(sk); 351 } 352 353 int ip6_mc_source(int add, int omode, struct sock *sk, 354 struct group_source_req *pgsr) 355 { 356 struct ipv6_pinfo *inet6 = inet6_sk(sk); 357 struct in6_addr *source, *group; 358 struct net *net = sock_net(sk); 359 struct ipv6_mc_socklist *pmc; 360 struct ip6_sf_socklist *psl; 361 struct inet6_dev *idev; 362 int leavegroup = 0; 363 int i, j, rv; 364 int err; 365 366 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 367 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 368 369 if (!ipv6_addr_is_multicast(group)) 370 return -EINVAL; 371 372 idev = ip6_mc_find_idev(net, group, pgsr->gsr_interface); 373 if (!idev) 374 return -ENODEV; 375 376 mutex_lock(&idev->mc_lock); 377 378 if (idev->dead) { 379 err = -ENODEV; 380 goto done; 381 } 382 383 err = -EADDRNOTAVAIL; 384 385 for_each_pmc_socklock(inet6, sk, pmc) { 386 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 387 continue; 388 if (ipv6_addr_equal(&pmc->addr, group)) 389 break; 390 } 391 if (!pmc) { /* must have a prior join */ 392 err = -EINVAL; 393 goto done; 394 } 395 /* if a source filter was set, must be the same mode as before */ 396 if (rcu_access_pointer(pmc->sflist)) { 397 if (pmc->sfmode != omode) { 398 err = -EINVAL; 399 goto done; 400 } 401 } else if (pmc->sfmode != omode) { 402 /* allow mode switches for empty-set filters */ 403 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 404 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 405 pmc->sfmode = omode; 406 } 407 408 psl = sock_dereference(pmc->sflist, sk); 409 if (!add) { 410 if (!psl) 411 goto done; /* err = -EADDRNOTAVAIL */ 412 rv = !0; 413 for (i = 0; i < psl->sl_count; i++) { 414 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 415 if (rv == 0) 416 break; 417 } 418 if (rv) /* source not found */ 419 goto done; /* err = -EADDRNOTAVAIL */ 420 421 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 422 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 423 leavegroup = 1; 424 goto done; 425 } 426 427 /* update the interface filter */ 428 ip6_mc_del_src(idev, group, omode, 1, source, 1); 429 430 for (j = i+1; j < psl->sl_count; j++) 431 psl->sl_addr[j-1] = psl->sl_addr[j]; 432 psl->sl_count--; 433 err = 0; 434 goto done; 435 } 436 /* else, add a new source to the filter */ 437 438 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 439 err = -ENOBUFS; 440 goto done; 441 } 442 if (!psl || psl->sl_count == psl->sl_max) { 443 struct ip6_sf_socklist *newpsl; 444 int count = IP6_SFBLOCK; 445 446 if (psl) 447 count += psl->sl_max; 448 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), 449 GFP_KERNEL); 450 if (!newpsl) { 451 err = -ENOBUFS; 452 goto done; 453 } 454 newpsl->sl_max = count; 455 newpsl->sl_count = count - IP6_SFBLOCK; 456 if (psl) { 457 for (i = 0; i < psl->sl_count; i++) 458 newpsl->sl_addr[i] = psl->sl_addr[i]; 459 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 460 &sk->sk_omem_alloc); 461 } 462 rcu_assign_pointer(pmc->sflist, newpsl); 463 kfree_rcu(psl, rcu); 464 psl = newpsl; 465 } 466 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 467 for (i = 0; i < psl->sl_count; i++) { 468 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 469 if (rv == 0) /* There is an error in the address. */ 470 goto done; 471 } 472 for (j = psl->sl_count-1; j >= i; j--) 473 psl->sl_addr[j+1] = psl->sl_addr[j]; 474 psl->sl_addr[i] = *source; 475 psl->sl_count++; 476 err = 0; 477 /* update the interface list */ 478 ip6_mc_add_src(idev, group, omode, 1, source, 1); 479 done: 480 mutex_unlock(&idev->mc_lock); 481 in6_dev_put(idev); 482 if (leavegroup) 483 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 484 return err; 485 } 486 487 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 488 struct sockaddr_storage *list) 489 { 490 struct ipv6_pinfo *inet6 = inet6_sk(sk); 491 struct ip6_sf_socklist *newpsl, *psl; 492 struct net *net = sock_net(sk); 493 const struct in6_addr *group; 494 struct ipv6_mc_socklist *pmc; 495 struct inet6_dev *idev; 496 int leavegroup = 0; 497 int i, err; 498 499 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 500 501 if (!ipv6_addr_is_multicast(group)) 502 return -EINVAL; 503 if (gsf->gf_fmode != MCAST_INCLUDE && 504 gsf->gf_fmode != MCAST_EXCLUDE) 505 return -EINVAL; 506 507 idev = ip6_mc_find_idev(net, group, gsf->gf_interface); 508 if (!idev) 509 return -ENODEV; 510 511 mutex_lock(&idev->mc_lock); 512 513 if (idev->dead) { 514 err = -ENODEV; 515 goto done; 516 } 517 518 err = 0; 519 520 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 521 leavegroup = 1; 522 goto done; 523 } 524 525 for_each_pmc_socklock(inet6, sk, pmc) { 526 if (pmc->ifindex != gsf->gf_interface) 527 continue; 528 if (ipv6_addr_equal(&pmc->addr, group)) 529 break; 530 } 531 if (!pmc) { /* must have a prior join */ 532 err = -EINVAL; 533 goto done; 534 } 535 if (gsf->gf_numsrc) { 536 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, 537 gsf->gf_numsrc), 538 GFP_KERNEL); 539 if (!newpsl) { 540 err = -ENOBUFS; 541 goto done; 542 } 543 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 544 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 545 struct sockaddr_in6 *psin6; 546 547 psin6 = (struct sockaddr_in6 *)list; 548 newpsl->sl_addr[i] = psin6->sin6_addr; 549 } 550 551 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 552 newpsl->sl_count, newpsl->sl_addr, 0); 553 if (err) { 554 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr, 555 newpsl->sl_max)); 556 goto done; 557 } 558 } else { 559 newpsl = NULL; 560 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 561 } 562 563 psl = sock_dereference(pmc->sflist, sk); 564 if (psl) { 565 ip6_mc_del_src(idev, group, pmc->sfmode, 566 psl->sl_count, psl->sl_addr, 0); 567 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 568 &sk->sk_omem_alloc); 569 } else { 570 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 571 } 572 573 rcu_assign_pointer(pmc->sflist, newpsl); 574 kfree_rcu(psl, rcu); 575 pmc->sfmode = gsf->gf_fmode; 576 err = 0; 577 done: 578 mutex_unlock(&idev->mc_lock); 579 in6_dev_put(idev); 580 if (leavegroup) 581 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 582 return err; 583 } 584 585 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 586 sockptr_t optval, size_t ss_offset) 587 { 588 struct ipv6_pinfo *inet6 = inet6_sk(sk); 589 const struct in6_addr *group; 590 struct ipv6_mc_socklist *pmc; 591 struct ip6_sf_socklist *psl; 592 unsigned int count; 593 int i, copycount; 594 595 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 596 597 if (!ipv6_addr_is_multicast(group)) 598 return -EINVAL; 599 600 for_each_pmc_socklock(inet6, sk, pmc) { 601 if (pmc->ifindex != gsf->gf_interface) 602 continue; 603 if (ipv6_addr_equal(group, &pmc->addr)) 604 break; 605 } 606 if (!pmc) /* must have a prior join */ 607 return -EADDRNOTAVAIL; 608 609 gsf->gf_fmode = pmc->sfmode; 610 psl = sock_dereference(pmc->sflist, sk); 611 count = psl ? psl->sl_count : 0; 612 613 copycount = min(count, gsf->gf_numsrc); 614 gsf->gf_numsrc = count; 615 for (i = 0; i < copycount; i++) { 616 struct sockaddr_in6 *psin6; 617 struct sockaddr_storage ss; 618 619 psin6 = (struct sockaddr_in6 *)&ss; 620 memset(&ss, 0, sizeof(ss)); 621 psin6->sin6_family = AF_INET6; 622 psin6->sin6_addr = psl->sl_addr[i]; 623 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss))) 624 return -EFAULT; 625 ss_offset += sizeof(ss); 626 } 627 return 0; 628 } 629 630 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, 631 const struct in6_addr *src_addr) 632 { 633 const struct ipv6_pinfo *np = inet6_sk(sk); 634 const struct ipv6_mc_socklist *mc; 635 const struct ip6_sf_socklist *psl; 636 bool rv = true; 637 638 rcu_read_lock(); 639 for_each_pmc_rcu(np, mc) { 640 if (ipv6_addr_equal(&mc->addr, mc_addr)) 641 break; 642 } 643 if (!mc) { 644 rcu_read_unlock(); 645 return inet6_test_bit(MC6_ALL, sk); 646 } 647 psl = rcu_dereference(mc->sflist); 648 if (!psl) { 649 rv = mc->sfmode == MCAST_EXCLUDE; 650 } else { 651 int i; 652 653 for (i = 0; i < psl->sl_count; i++) { 654 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 655 break; 656 } 657 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 658 rv = false; 659 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 660 rv = false; 661 } 662 rcu_read_unlock(); 663 664 return rv; 665 } 666 667 static void igmp6_group_added(struct ifmcaddr6 *mc) 668 { 669 struct net_device *dev = mc->idev->dev; 670 char buf[MAX_ADDR_LEN]; 671 672 mc_assert_locked(mc->idev); 673 674 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 675 IPV6_ADDR_SCOPE_LINKLOCAL) 676 return; 677 678 if (!(mc->mca_flags&MAF_LOADED)) { 679 mc->mca_flags |= MAF_LOADED; 680 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 681 dev_mc_add(dev, buf); 682 } 683 684 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 685 return; 686 687 if (mld_in_v1_mode(mc->idev)) { 688 igmp6_join_group(mc); 689 return; 690 } 691 /* else v2 */ 692 693 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 694 * should not send filter-mode change record as the mode 695 * should be from IN() to IN(A). 696 */ 697 if (mc->mca_sfmode == MCAST_EXCLUDE) 698 mc->mca_crcount = mc->idev->mc_qrv; 699 700 mld_ifc_event(mc->idev); 701 } 702 703 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 704 { 705 struct net_device *dev = mc->idev->dev; 706 char buf[MAX_ADDR_LEN]; 707 708 mc_assert_locked(mc->idev); 709 710 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 711 IPV6_ADDR_SCOPE_LINKLOCAL) 712 return; 713 714 if (mc->mca_flags&MAF_LOADED) { 715 mc->mca_flags &= ~MAF_LOADED; 716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 717 dev_mc_del(dev, buf); 718 } 719 720 if (mc->mca_flags & MAF_NOREPORT) 721 return; 722 723 if (!mc->idev->dead) 724 igmp6_leave_group(mc); 725 726 if (cancel_delayed_work(&mc->mca_work)) 727 refcount_dec(&mc->mca_refcnt); 728 } 729 730 /* deleted ifmcaddr6 manipulation */ 731 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 732 { 733 struct ifmcaddr6 *pmc; 734 735 mc_assert_locked(idev); 736 737 /* this is an "ifmcaddr6" for convenience; only the fields below 738 * are actually used. In particular, the refcnt and users are not 739 * used for management of the delete list. Using the same structure 740 * for deleted items allows change reports to use common code with 741 * non-deleted or query-response MCA's. 742 */ 743 pmc = kzalloc_obj(*pmc); 744 if (!pmc) 745 return; 746 747 pmc->idev = im->idev; 748 in6_dev_hold(idev); 749 pmc->mca_addr = im->mca_addr; 750 pmc->mca_crcount = idev->mc_qrv; 751 pmc->mca_sfmode = im->mca_sfmode; 752 if (pmc->mca_sfmode == MCAST_INCLUDE) { 753 struct ip6_sf_list *psf; 754 755 rcu_assign_pointer(pmc->mca_tomb, 756 mc_dereference(im->mca_tomb, idev)); 757 rcu_assign_pointer(pmc->mca_sources, 758 mc_dereference(im->mca_sources, idev)); 759 RCU_INIT_POINTER(im->mca_tomb, NULL); 760 RCU_INIT_POINTER(im->mca_sources, NULL); 761 762 for_each_psf_mclock(pmc, psf) 763 psf->sf_crcount = pmc->mca_crcount; 764 } 765 766 rcu_assign_pointer(pmc->next, idev->mc_tomb); 767 rcu_assign_pointer(idev->mc_tomb, pmc); 768 } 769 770 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 771 { 772 struct ip6_sf_list *psf, *sources, *tomb; 773 struct in6_addr *pmca = &im->mca_addr; 774 struct ifmcaddr6 *pmc, *pmc_prev; 775 776 mc_assert_locked(idev); 777 778 pmc_prev = NULL; 779 for_each_mc_tomb(idev, pmc) { 780 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 781 break; 782 pmc_prev = pmc; 783 } 784 if (!pmc) 785 return; 786 if (pmc_prev) 787 rcu_assign_pointer(pmc_prev->next, pmc->next); 788 else 789 rcu_assign_pointer(idev->mc_tomb, pmc->next); 790 791 im->idev = pmc->idev; 792 if (im->mca_sfmode == MCAST_INCLUDE) { 793 tomb = rcu_replace_pointer(im->mca_tomb, 794 mc_dereference(pmc->mca_tomb, pmc->idev), 795 lockdep_is_held(&im->idev->mc_lock)); 796 rcu_assign_pointer(pmc->mca_tomb, tomb); 797 798 sources = rcu_replace_pointer(im->mca_sources, 799 mc_dereference(pmc->mca_sources, pmc->idev), 800 lockdep_is_held(&im->idev->mc_lock)); 801 rcu_assign_pointer(pmc->mca_sources, sources); 802 for_each_psf_mclock(im, psf) 803 psf->sf_crcount = idev->mc_qrv; 804 } else { 805 im->mca_crcount = idev->mc_qrv; 806 } 807 ip6_mc_clear_src(pmc); 808 in6_dev_put(pmc->idev); 809 kfree_rcu(pmc, rcu); 810 } 811 812 static void mld_clear_delrec(struct inet6_dev *idev) 813 { 814 struct ifmcaddr6 *pmc, *nextpmc; 815 816 mc_assert_locked(idev); 817 818 pmc = mc_dereference(idev->mc_tomb, idev); 819 RCU_INIT_POINTER(idev->mc_tomb, NULL); 820 821 for (; pmc; pmc = nextpmc) { 822 nextpmc = mc_dereference(pmc->next, idev); 823 ip6_mc_clear_src(pmc); 824 in6_dev_put(pmc->idev); 825 kfree_rcu(pmc, rcu); 826 } 827 828 /* clear dead sources, too */ 829 for_each_mc_mclock(idev, pmc) { 830 struct ip6_sf_list *psf, *psf_next; 831 832 psf = mc_dereference(pmc->mca_tomb, idev); 833 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 834 for (; psf; psf = psf_next) { 835 psf_next = mc_dereference(psf->sf_next, idev); 836 kfree_rcu(psf, rcu); 837 } 838 } 839 } 840 841 static void mld_clear_query(struct inet6_dev *idev) 842 { 843 spin_lock_bh(&idev->mc_query_lock); 844 __skb_queue_purge(&idev->mc_query_queue); 845 spin_unlock_bh(&idev->mc_query_lock); 846 } 847 848 static void mld_clear_report(struct inet6_dev *idev) 849 { 850 spin_lock_bh(&idev->mc_report_lock); 851 __skb_queue_purge(&idev->mc_report_queue); 852 spin_unlock_bh(&idev->mc_report_lock); 853 } 854 855 static void ma_put(struct ifmcaddr6 *mc) 856 { 857 if (refcount_dec_and_test(&mc->mca_refcnt)) { 858 in6_dev_put(mc->idev); 859 kfree_rcu(mc, rcu); 860 } 861 } 862 863 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 864 const struct in6_addr *addr, 865 unsigned int mode) 866 { 867 struct ifmcaddr6 *mc; 868 869 mc_assert_locked(idev); 870 871 mc = kzalloc_obj(*mc); 872 if (!mc) 873 return NULL; 874 875 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 876 877 mc->mca_addr = *addr; 878 mc->idev = idev; /* reference taken by caller */ 879 WRITE_ONCE(mc->mca_users, 1); 880 /* mca_stamp should be updated upon changes */ 881 mc->mca_cstamp = mc->mca_tstamp = jiffies; 882 refcount_set(&mc->mca_refcnt, 1); 883 884 mc->mca_sfmode = mode; 885 mc->mca_sfcount[mode] = 1; 886 887 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 888 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 889 mc->mca_flags |= MAF_NOREPORT; 890 891 return mc; 892 } 893 894 static void inet6_ifmcaddr_notify(struct net_device *dev, 895 const struct ifmcaddr6 *ifmca, int event) 896 { 897 struct inet6_fill_args fillargs = { 898 .portid = 0, 899 .seq = 0, 900 .event = event, 901 .flags = 0, 902 .netnsid = -1, 903 .force_rt_scope_universe = true, 904 }; 905 struct net *net = dev_net(dev); 906 struct sk_buff *skb; 907 int err = -ENOMEM; 908 909 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + 910 nla_total_size(sizeof(struct in6_addr)) + 911 nla_total_size(sizeof(struct ifa_cacheinfo)), 912 GFP_KERNEL); 913 if (!skb) 914 goto error; 915 916 err = inet6_fill_ifmcaddr(skb, ifmca, &fillargs); 917 if (err < 0) { 918 WARN_ON_ONCE(err == -EMSGSIZE); 919 nlmsg_free(skb); 920 goto error; 921 } 922 923 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MCADDR, NULL, GFP_KERNEL); 924 return; 925 error: 926 rtnl_set_sk_err(net, RTNLGRP_IPV6_MCADDR, err); 927 } 928 929 /* 930 * device multicast group inc (add if not found) 931 */ 932 static int __ipv6_dev_mc_inc(struct net_device *dev, 933 const struct in6_addr *addr, unsigned int mode) 934 { 935 struct inet6_dev *idev; 936 struct ifmcaddr6 *mc; 937 938 /* we need to take a reference on idev */ 939 idev = in6_dev_get(dev); 940 if (!idev) 941 return -EINVAL; 942 943 mutex_lock(&idev->mc_lock); 944 945 if (READ_ONCE(idev->dead)) { 946 mutex_unlock(&idev->mc_lock); 947 in6_dev_put(idev); 948 return -ENODEV; 949 } 950 951 for_each_mc_mclock(idev, mc) { 952 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 953 WRITE_ONCE(mc->mca_users, mc->mca_users + 1); 954 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 955 mutex_unlock(&idev->mc_lock); 956 in6_dev_put(idev); 957 return 0; 958 } 959 } 960 961 mc = mca_alloc(idev, addr, mode); 962 if (!mc) { 963 mutex_unlock(&idev->mc_lock); 964 in6_dev_put(idev); 965 return -ENOMEM; 966 } 967 968 rcu_assign_pointer(mc->next, idev->mc_list); 969 rcu_assign_pointer(idev->mc_list, mc); 970 971 mld_del_delrec(idev, mc); 972 igmp6_group_added(mc); 973 inet6_ifmcaddr_notify(dev, mc, RTM_NEWMULTICAST); 974 mutex_unlock(&idev->mc_lock); 975 976 return 0; 977 } 978 979 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 980 { 981 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 982 } 983 EXPORT_SYMBOL(ipv6_dev_mc_inc); 984 985 /* 986 * device multicast group del 987 */ 988 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 989 { 990 struct ifmcaddr6 *ma, __rcu **map; 991 992 mutex_lock(&idev->mc_lock); 993 994 for (map = &idev->mc_list; 995 (ma = mc_dereference(*map, idev)); 996 map = &ma->next) { 997 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 998 int new_users = ma->mca_users - 1; 999 1000 WRITE_ONCE(ma->mca_users, new_users); 1001 if (new_users == 0) { 1002 *map = ma->next; 1003 1004 igmp6_group_dropped(ma); 1005 inet6_ifmcaddr_notify(idev->dev, ma, 1006 RTM_DELMULTICAST); 1007 ip6_mc_clear_src(ma); 1008 mutex_unlock(&idev->mc_lock); 1009 1010 ma_put(ma); 1011 return 0; 1012 } 1013 mutex_unlock(&idev->mc_lock); 1014 return 0; 1015 } 1016 } 1017 1018 mutex_unlock(&idev->mc_lock); 1019 return -ENOENT; 1020 } 1021 1022 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 1023 { 1024 struct inet6_dev *idev; 1025 int err; 1026 1027 idev = in6_dev_get(dev); 1028 if (!idev) 1029 return -ENODEV; 1030 1031 err = __ipv6_dev_mc_dec(idev, addr); 1032 in6_dev_put(idev); 1033 1034 return err; 1035 } 1036 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1037 1038 /* 1039 * check if the interface/address pair is valid 1040 */ 1041 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1042 const struct in6_addr *src_addr) 1043 { 1044 struct inet6_dev *idev; 1045 struct ifmcaddr6 *mc; 1046 bool rv = false; 1047 1048 rcu_read_lock(); 1049 idev = __in6_dev_get(dev); 1050 if (!idev) 1051 goto unlock; 1052 for_each_mc_rcu(idev, mc) { 1053 if (ipv6_addr_equal(&mc->mca_addr, group)) 1054 break; 1055 } 1056 if (!mc) 1057 goto unlock; 1058 if (src_addr && !ipv6_addr_any(src_addr)) { 1059 struct ip6_sf_list *psf; 1060 1061 for_each_psf_rcu(mc, psf) { 1062 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1063 break; 1064 } 1065 if (psf) 1066 rv = READ_ONCE(psf->sf_count[MCAST_INCLUDE]) || 1067 READ_ONCE(psf->sf_count[MCAST_EXCLUDE]) != 1068 READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]); 1069 else 1070 rv = READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]) != 0; 1071 } else { 1072 rv = true; /* don't filter unspecified source */ 1073 } 1074 unlock: 1075 rcu_read_unlock(); 1076 return rv; 1077 } 1078 1079 static void mld_gq_start_work(struct inet6_dev *idev) 1080 { 1081 unsigned long tv = get_random_u32_below(idev->mc_maxdelay); 1082 1083 mc_assert_locked(idev); 1084 1085 idev->mc_gq_running = 1; 1086 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1087 in6_dev_hold(idev); 1088 } 1089 1090 static void mld_gq_stop_work(struct inet6_dev *idev) 1091 { 1092 mc_assert_locked(idev); 1093 1094 idev->mc_gq_running = 0; 1095 if (cancel_delayed_work(&idev->mc_gq_work)) 1096 __in6_dev_put(idev); 1097 } 1098 1099 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1100 { 1101 unsigned long tv = get_random_u32_below(delay); 1102 1103 mc_assert_locked(idev); 1104 1105 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1106 in6_dev_hold(idev); 1107 } 1108 1109 static void mld_ifc_stop_work(struct inet6_dev *idev) 1110 { 1111 mc_assert_locked(idev); 1112 1113 idev->mc_ifc_count = 0; 1114 if (cancel_delayed_work(&idev->mc_ifc_work)) 1115 __in6_dev_put(idev); 1116 } 1117 1118 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1119 { 1120 unsigned long tv = get_random_u32_below(delay); 1121 1122 mc_assert_locked(idev); 1123 1124 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1125 in6_dev_hold(idev); 1126 } 1127 1128 static void mld_dad_stop_work(struct inet6_dev *idev) 1129 { 1130 if (cancel_delayed_work(&idev->mc_dad_work)) 1131 __in6_dev_put(idev); 1132 } 1133 1134 static void mld_query_stop_work(struct inet6_dev *idev) 1135 { 1136 spin_lock_bh(&idev->mc_query_lock); 1137 if (cancel_delayed_work(&idev->mc_query_work)) 1138 __in6_dev_put(idev); 1139 spin_unlock_bh(&idev->mc_query_lock); 1140 } 1141 1142 static void mld_report_stop_work(struct inet6_dev *idev) 1143 { 1144 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1145 __in6_dev_put(idev); 1146 } 1147 1148 /* IGMP handling (alias multicast ICMPv6 messages) */ 1149 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1150 { 1151 unsigned long delay = resptime; 1152 1153 mc_assert_locked(ma->idev); 1154 1155 /* Do not start work for these addresses */ 1156 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1157 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1158 return; 1159 1160 if (cancel_delayed_work(&ma->mca_work)) { 1161 refcount_dec(&ma->mca_refcnt); 1162 delay = ma->mca_work.timer.expires - jiffies; 1163 } 1164 1165 if (delay >= resptime) 1166 delay = get_random_u32_below(resptime); 1167 1168 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1169 refcount_inc(&ma->mca_refcnt); 1170 ma->mca_flags |= MAF_TIMER_RUNNING; 1171 } 1172 1173 /* mark EXCLUDE-mode sources */ 1174 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1175 const struct in6_addr *srcs) 1176 { 1177 struct ip6_sf_list *psf; 1178 int i, scount; 1179 1180 mc_assert_locked(pmc->idev); 1181 1182 scount = 0; 1183 for_each_psf_mclock(pmc, psf) { 1184 if (scount == nsrcs) 1185 break; 1186 for (i = 0; i < nsrcs; i++) { 1187 /* skip inactive filters */ 1188 if (psf->sf_count[MCAST_INCLUDE] || 1189 pmc->mca_sfcount[MCAST_EXCLUDE] != 1190 psf->sf_count[MCAST_EXCLUDE]) 1191 break; 1192 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1193 scount++; 1194 break; 1195 } 1196 } 1197 } 1198 pmc->mca_flags &= ~MAF_GSQUERY; 1199 if (scount == nsrcs) /* all sources excluded */ 1200 return false; 1201 return true; 1202 } 1203 1204 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1205 const struct in6_addr *srcs) 1206 { 1207 struct ip6_sf_list *psf; 1208 int i, scount; 1209 1210 mc_assert_locked(pmc->idev); 1211 1212 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1213 return mld_xmarksources(pmc, nsrcs, srcs); 1214 1215 /* mark INCLUDE-mode sources */ 1216 1217 scount = 0; 1218 for_each_psf_mclock(pmc, psf) { 1219 if (scount == nsrcs) 1220 break; 1221 for (i = 0; i < nsrcs; i++) { 1222 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1223 psf->sf_gsresp = 1; 1224 scount++; 1225 break; 1226 } 1227 } 1228 } 1229 if (!scount) { 1230 pmc->mca_flags &= ~MAF_GSQUERY; 1231 return false; 1232 } 1233 pmc->mca_flags |= MAF_GSQUERY; 1234 return true; 1235 } 1236 1237 static int mld_force_mld_version(const struct inet6_dev *idev) 1238 { 1239 const struct net *net = dev_net(idev->dev); 1240 int all_force; 1241 1242 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1243 /* Normally, both are 0 here. If enforcement to a particular is 1244 * being used, individual device enforcement will have a lower 1245 * precedence over 'all' device (.../conf/all/force_mld_version). 1246 */ 1247 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1248 } 1249 1250 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1251 { 1252 return mld_force_mld_version(idev) == 2; 1253 } 1254 1255 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1256 { 1257 return mld_force_mld_version(idev) == 1; 1258 } 1259 1260 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1261 { 1262 if (mld_in_v2_mode_only(idev)) 1263 return false; 1264 if (mld_in_v1_mode_only(idev)) 1265 return true; 1266 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1267 return true; 1268 1269 return false; 1270 } 1271 1272 static void mld_set_v1_mode(struct inet6_dev *idev) 1273 { 1274 /* RFC3810, relevant sections: 1275 * - 9.1. Robustness Variable 1276 * - 9.2. Query Interval 1277 * - 9.3. Query Response Interval 1278 * - 9.12. Older Version Querier Present Timeout 1279 */ 1280 unsigned long switchback; 1281 1282 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1283 1284 idev->mc_v1_seen = jiffies + switchback; 1285 } 1286 1287 static void mld_update_qrv(struct inet6_dev *idev, 1288 const struct mld2_query *mlh2) 1289 { 1290 /* RFC3810, relevant sections: 1291 * - 5.1.8. QRV (Querier's Robustness Variable) 1292 * - 9.1. Robustness Variable 1293 */ 1294 1295 /* The value of the Robustness Variable MUST NOT be zero, 1296 * and SHOULD NOT be one. Catch this here if we ever run 1297 * into such a case in future. 1298 */ 1299 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1300 WARN_ON(idev->mc_qrv == 0); 1301 1302 if (mlh2->mld2q_qrv > 0) 1303 idev->mc_qrv = mlh2->mld2q_qrv; 1304 1305 if (unlikely(idev->mc_qrv < min_qrv)) { 1306 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1307 idev->mc_qrv, min_qrv); 1308 idev->mc_qrv = min_qrv; 1309 } 1310 } 1311 1312 static void mld_update_qi(struct inet6_dev *idev, 1313 const struct mld2_query *mlh2) 1314 { 1315 /* RFC3810, relevant sections: 1316 * - 5.1.9. QQIC (Querier's Query Interval Code) 1317 * - 9.2. Query Interval 1318 * - 9.12. Older Version Querier Present Timeout 1319 * (the [Query Interval] in the last Query received) 1320 */ 1321 idev->mc_qi = mldv2_qqi(mlh2) * HZ; 1322 } 1323 1324 static void mld_update_qri(struct inet6_dev *idev, 1325 const struct mld2_query *mlh2) 1326 { 1327 /* RFC3810, relevant sections: 1328 * - 5.1.3. Maximum Response Code 1329 * - 9.3. Query Response Interval 1330 */ 1331 idev->mc_qri = msecs_to_jiffies(mldv2_mrd(mlh2)); 1332 } 1333 1334 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1335 unsigned long *max_delay, bool v1_query) 1336 { 1337 unsigned long mldv1_md; 1338 1339 /* Ignore v1 queries */ 1340 if (mld_in_v2_mode_only(idev)) 1341 return -EINVAL; 1342 1343 mldv1_md = ntohs(mld->mld_maxdelay); 1344 1345 /* When in MLDv1 fallback and a MLDv2 router start-up being 1346 * unaware of current MLDv1 operation, the MRC == MRD mapping 1347 * only works when the exponential algorithm is not being 1348 * used (as MLDv1 is unaware of such things). 1349 * 1350 * According to the RFC author, the MLDv2 implementations 1351 * he's aware of all use a MRC < 32768 on start up queries. 1352 * 1353 * Thus, should we *ever* encounter something else larger 1354 * than that, just assume the maximum possible within our 1355 * reach. 1356 */ 1357 if (!v1_query) 1358 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1359 1360 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1361 1362 /* MLDv1 router present: we need to go into v1 mode *only* 1363 * when an MLDv1 query is received as per section 9.12. of 1364 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1365 * queries MUST be of exactly 24 octets. 1366 */ 1367 if (v1_query) 1368 mld_set_v1_mode(idev); 1369 1370 /* cancel MLDv2 report work */ 1371 mld_gq_stop_work(idev); 1372 /* cancel the interface change work */ 1373 mld_ifc_stop_work(idev); 1374 /* clear deleted report items */ 1375 mld_clear_delrec(idev); 1376 1377 return 0; 1378 } 1379 1380 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1381 unsigned long *max_delay) 1382 { 1383 *max_delay = max(msecs_to_jiffies(mldv2_mrd(mld)), 1UL); 1384 1385 mld_update_qrv(idev, mld); 1386 mld_update_qi(idev, mld); 1387 mld_update_qri(idev, mld); 1388 1389 idev->mc_maxdelay = *max_delay; 1390 1391 return; 1392 } 1393 1394 /* called with rcu_read_lock() */ 1395 void igmp6_event_query(struct sk_buff *skb) 1396 { 1397 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1398 1399 if (!idev || idev->dead) 1400 goto out; 1401 1402 spin_lock_bh(&idev->mc_query_lock); 1403 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1404 __skb_queue_tail(&idev->mc_query_queue, skb); 1405 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1406 in6_dev_hold(idev); 1407 skb = NULL; 1408 } 1409 spin_unlock_bh(&idev->mc_query_lock); 1410 out: 1411 kfree_skb(skb); 1412 } 1413 1414 static void __mld_query_work(struct sk_buff *skb) 1415 { 1416 struct mld2_query *mlh2 = NULL; 1417 unsigned long max_delay; 1418 struct inet6_dev *idev; 1419 struct in6_addr group; 1420 struct ifmcaddr6 *ma; 1421 struct mld_msg *mld; 1422 int group_type; 1423 int mark = 0; 1424 int len, err; 1425 1426 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1427 goto kfree_skb; 1428 1429 /* compute payload length excluding extension headers */ 1430 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1431 len -= skb_network_header_len(skb); 1432 1433 /* RFC3810 6.2 1434 * Upon reception of an MLD message that contains a Query, the node 1435 * checks if the source address of the message is a valid link-local 1436 * address, if the Hop Limit is set to 1, and if the Router Alert 1437 * option is present in the Hop-By-Hop Options header of the IPv6 1438 * packet. If any of these checks fails, the packet is dropped. 1439 */ 1440 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1441 ipv6_hdr(skb)->hop_limit != 1 || 1442 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1443 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1444 goto kfree_skb; 1445 1446 idev = in6_dev_get(skb->dev); 1447 if (!idev) 1448 goto kfree_skb; 1449 1450 mld = (struct mld_msg *)icmp6_hdr(skb); 1451 group = mld->mld_mca; 1452 group_type = ipv6_addr_type(&group); 1453 1454 if (group_type != IPV6_ADDR_ANY && 1455 !(group_type&IPV6_ADDR_MULTICAST)) 1456 goto out; 1457 1458 if (len < MLD_V1_QUERY_LEN) { 1459 goto out; 1460 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1461 err = mld_process_v1(idev, mld, &max_delay, 1462 len == MLD_V1_QUERY_LEN); 1463 if (err < 0) 1464 goto out; 1465 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1466 int srcs_offset = sizeof(struct mld2_query) - 1467 sizeof(struct icmp6hdr); 1468 1469 if (!pskb_may_pull(skb, srcs_offset)) 1470 goto out; 1471 1472 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1473 1474 mld_process_v2(idev, mlh2, &max_delay); 1475 1476 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1477 if (mlh2->mld2q_nsrcs) 1478 goto out; /* no sources allowed */ 1479 1480 mld_gq_start_work(idev); 1481 goto out; 1482 } 1483 /* mark sources to include, if group & source-specific */ 1484 if (mlh2->mld2q_nsrcs != 0) { 1485 if (!pskb_may_pull(skb, srcs_offset + 1486 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1487 goto out; 1488 1489 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1490 mark = 1; 1491 } 1492 } else { 1493 goto out; 1494 } 1495 1496 if (group_type == IPV6_ADDR_ANY) { 1497 for_each_mc_mclock(idev, ma) { 1498 igmp6_group_queried(ma, max_delay); 1499 } 1500 } else { 1501 for_each_mc_mclock(idev, ma) { 1502 if (!ipv6_addr_equal(&group, &ma->mca_addr)) 1503 continue; 1504 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1505 /* gsquery <- gsquery && mark */ 1506 if (!mark) 1507 ma->mca_flags &= ~MAF_GSQUERY; 1508 } else { 1509 /* gsquery <- mark */ 1510 if (mark) 1511 ma->mca_flags |= MAF_GSQUERY; 1512 else 1513 ma->mca_flags &= ~MAF_GSQUERY; 1514 } 1515 if (!(ma->mca_flags & MAF_GSQUERY) || 1516 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1517 igmp6_group_queried(ma, max_delay); 1518 break; 1519 } 1520 } 1521 1522 out: 1523 in6_dev_put(idev); 1524 kfree_skb: 1525 consume_skb(skb); 1526 } 1527 1528 static void mld_query_work(struct work_struct *work) 1529 { 1530 struct inet6_dev *idev = container_of(to_delayed_work(work), 1531 struct inet6_dev, 1532 mc_query_work); 1533 struct sk_buff_head q; 1534 struct sk_buff *skb; 1535 bool rework = false; 1536 int cnt = 0; 1537 1538 skb_queue_head_init(&q); 1539 1540 spin_lock_bh(&idev->mc_query_lock); 1541 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1542 __skb_queue_tail(&q, skb); 1543 1544 if (++cnt >= MLD_MAX_QUEUE) { 1545 rework = true; 1546 break; 1547 } 1548 } 1549 spin_unlock_bh(&idev->mc_query_lock); 1550 1551 mutex_lock(&idev->mc_lock); 1552 while ((skb = __skb_dequeue(&q))) 1553 __mld_query_work(skb); 1554 mutex_unlock(&idev->mc_lock); 1555 1556 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1557 return; 1558 1559 in6_dev_put(idev); 1560 } 1561 1562 /* called with rcu_read_lock() */ 1563 void igmp6_event_report(struct sk_buff *skb) 1564 { 1565 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1566 1567 if (!idev || idev->dead) 1568 goto out; 1569 1570 spin_lock_bh(&idev->mc_report_lock); 1571 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1572 __skb_queue_tail(&idev->mc_report_queue, skb); 1573 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1574 in6_dev_hold(idev); 1575 skb = NULL; 1576 } 1577 spin_unlock_bh(&idev->mc_report_lock); 1578 out: 1579 kfree_skb(skb); 1580 } 1581 1582 static void __mld_report_work(struct sk_buff *skb) 1583 { 1584 struct inet6_dev *idev; 1585 struct ifmcaddr6 *ma; 1586 struct mld_msg *mld; 1587 int addr_type; 1588 1589 /* Our own report looped back. Ignore it. */ 1590 if (skb->pkt_type == PACKET_LOOPBACK) 1591 goto kfree_skb; 1592 1593 /* send our report if the MC router may not have heard this report */ 1594 if (skb->pkt_type != PACKET_MULTICAST && 1595 skb->pkt_type != PACKET_BROADCAST) 1596 goto kfree_skb; 1597 1598 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1599 goto kfree_skb; 1600 1601 mld = (struct mld_msg *)icmp6_hdr(skb); 1602 1603 /* Drop reports with not link local source */ 1604 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1605 if (addr_type != IPV6_ADDR_ANY && 1606 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1607 goto kfree_skb; 1608 1609 idev = in6_dev_get(skb->dev); 1610 if (!idev) 1611 goto kfree_skb; 1612 1613 /* 1614 * Cancel the work for this group 1615 */ 1616 1617 for_each_mc_mclock(idev, ma) { 1618 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1619 if (cancel_delayed_work(&ma->mca_work)) 1620 refcount_dec(&ma->mca_refcnt); 1621 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1622 MAF_TIMER_RUNNING); 1623 break; 1624 } 1625 } 1626 1627 in6_dev_put(idev); 1628 kfree_skb: 1629 consume_skb(skb); 1630 } 1631 1632 static void mld_report_work(struct work_struct *work) 1633 { 1634 struct inet6_dev *idev = container_of(to_delayed_work(work), 1635 struct inet6_dev, 1636 mc_report_work); 1637 struct sk_buff_head q; 1638 struct sk_buff *skb; 1639 bool rework = false; 1640 int cnt = 0; 1641 1642 skb_queue_head_init(&q); 1643 spin_lock_bh(&idev->mc_report_lock); 1644 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1645 __skb_queue_tail(&q, skb); 1646 1647 if (++cnt >= MLD_MAX_QUEUE) { 1648 rework = true; 1649 break; 1650 } 1651 } 1652 spin_unlock_bh(&idev->mc_report_lock); 1653 1654 mutex_lock(&idev->mc_lock); 1655 while ((skb = __skb_dequeue(&q))) 1656 __mld_report_work(skb); 1657 mutex_unlock(&idev->mc_lock); 1658 1659 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1660 return; 1661 1662 in6_dev_put(idev); 1663 } 1664 1665 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1666 int gdeleted, int sdeleted) 1667 { 1668 switch (type) { 1669 case MLD2_MODE_IS_INCLUDE: 1670 case MLD2_MODE_IS_EXCLUDE: 1671 if (gdeleted || sdeleted) 1672 return false; 1673 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1674 if (pmc->mca_sfmode == MCAST_INCLUDE) 1675 return true; 1676 /* don't include if this source is excluded 1677 * in all filters 1678 */ 1679 if (psf->sf_count[MCAST_INCLUDE]) 1680 return type == MLD2_MODE_IS_INCLUDE; 1681 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1682 psf->sf_count[MCAST_EXCLUDE]; 1683 } 1684 return false; 1685 case MLD2_CHANGE_TO_INCLUDE: 1686 if (gdeleted || sdeleted) 1687 return false; 1688 return psf->sf_count[MCAST_INCLUDE] != 0; 1689 case MLD2_CHANGE_TO_EXCLUDE: 1690 if (gdeleted || sdeleted) 1691 return false; 1692 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1693 psf->sf_count[MCAST_INCLUDE]) 1694 return false; 1695 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1696 psf->sf_count[MCAST_EXCLUDE]; 1697 case MLD2_ALLOW_NEW_SOURCES: 1698 if (gdeleted || !psf->sf_crcount) 1699 return false; 1700 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1701 case MLD2_BLOCK_OLD_SOURCES: 1702 if (pmc->mca_sfmode == MCAST_INCLUDE) 1703 return gdeleted || (psf->sf_crcount && sdeleted); 1704 return psf->sf_crcount && !gdeleted && !sdeleted; 1705 } 1706 return false; 1707 } 1708 1709 static int 1710 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1711 { 1712 struct ip6_sf_list *psf; 1713 int scount = 0; 1714 1715 for_each_psf_mclock(pmc, psf) { 1716 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1717 continue; 1718 scount++; 1719 } 1720 return scount; 1721 } 1722 1723 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1724 struct net_device *dev, const struct in6_addr *saddr, 1725 const struct in6_addr *daddr, int proto, int len) 1726 { 1727 struct ipv6hdr *hdr; 1728 1729 skb->protocol = htons(ETH_P_IPV6); 1730 skb->dev = dev; 1731 1732 skb_reset_network_header(skb); 1733 skb_put(skb, sizeof(struct ipv6hdr)); 1734 hdr = ipv6_hdr(skb); 1735 1736 ip6_flow_hdr(hdr, 0, 0); 1737 1738 hdr->payload_len = htons(len); 1739 hdr->nexthdr = proto; 1740 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1741 1742 hdr->saddr = *saddr; 1743 hdr->daddr = *daddr; 1744 } 1745 1746 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1747 { 1748 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1749 2, 0, 0, IPV6_TLV_PADN, 0 }; 1750 struct net_device *dev = idev->dev; 1751 int hlen = LL_RESERVED_SPACE(dev); 1752 int tlen = dev->needed_tailroom; 1753 const struct in6_addr *saddr; 1754 struct in6_addr addr_buf; 1755 struct mld2_report *pmr; 1756 struct sk_buff *skb; 1757 unsigned int size; 1758 struct sock *sk; 1759 struct net *net; 1760 1761 /* we assume size > sizeof(ra) here 1762 * Also try to not allocate high-order pages for big MTU 1763 */ 1764 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1765 skb = alloc_skb(size, GFP_KERNEL); 1766 if (!skb) 1767 return NULL; 1768 1769 skb->priority = TC_PRIO_CONTROL; 1770 skb_reserve(skb, hlen); 1771 skb_tailroom_reserve(skb, mtu, tlen); 1772 1773 rcu_read_lock(); 1774 1775 net = dev_net_rcu(dev); 1776 sk = net->ipv6.igmp_sk; 1777 skb_set_owner_w(skb, sk); 1778 1779 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1780 /* <draft-ietf-magma-mld-source-05.txt>: 1781 * use unspecified address as the source address 1782 * when a valid link-local address is not available. 1783 */ 1784 saddr = &in6addr_any; 1785 } else 1786 saddr = &addr_buf; 1787 1788 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1789 1790 rcu_read_unlock(); 1791 1792 skb_put_data(skb, ra, sizeof(ra)); 1793 1794 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1795 skb_put(skb, sizeof(*pmr)); 1796 pmr = (struct mld2_report *)skb_transport_header(skb); 1797 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1798 pmr->mld2r_resv1 = 0; 1799 pmr->mld2r_cksum = 0; 1800 pmr->mld2r_resv2 = 0; 1801 pmr->mld2r_ngrec = 0; 1802 return skb; 1803 } 1804 1805 static void mld_sendpack(struct sk_buff *skb) 1806 { 1807 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1808 struct mld2_report *pmr = 1809 (struct mld2_report *)skb_transport_header(skb); 1810 int payload_len, mldlen; 1811 struct inet6_dev *idev; 1812 struct net *net = dev_net(skb->dev); 1813 int err; 1814 struct flowi6 fl6; 1815 struct dst_entry *dst; 1816 1817 rcu_read_lock(); 1818 idev = __in6_dev_get(skb->dev); 1819 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1820 1821 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1822 sizeof(*pip6); 1823 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1824 pip6->payload_len = htons(payload_len); 1825 1826 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1827 IPPROTO_ICMPV6, 1828 csum_partial(skb_transport_header(skb), 1829 mldlen, 0)); 1830 1831 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1832 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1833 skb->dev->ifindex); 1834 dst = icmp6_dst_alloc(skb->dev, &fl6); 1835 1836 err = 0; 1837 if (IS_ERR(dst)) { 1838 err = PTR_ERR(dst); 1839 dst = NULL; 1840 } 1841 skb_dst_set(skb, dst); 1842 if (err) 1843 goto err_out; 1844 1845 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1846 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1847 dst_output); 1848 out: 1849 if (!err) { 1850 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1851 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1852 } else { 1853 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1854 } 1855 1856 rcu_read_unlock(); 1857 return; 1858 1859 err_out: 1860 kfree_skb(skb); 1861 goto out; 1862 } 1863 1864 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1865 { 1866 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1867 } 1868 1869 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1870 int type, struct mld2_grec **ppgr, unsigned int mtu) 1871 { 1872 struct mld2_report *pmr; 1873 struct mld2_grec *pgr; 1874 1875 if (!skb) { 1876 skb = mld_newpack(pmc->idev, mtu); 1877 if (!skb) 1878 return NULL; 1879 } 1880 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1881 pgr->grec_type = type; 1882 pgr->grec_auxwords = 0; 1883 pgr->grec_nsrcs = 0; 1884 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1885 pmr = (struct mld2_report *)skb_transport_header(skb); 1886 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1887 *ppgr = pgr; 1888 return skb; 1889 } 1890 1891 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1892 1893 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1894 int type, int gdeleted, int sdeleted, 1895 int crsend) 1896 { 1897 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1898 int scount, stotal, first, isquery, truncate; 1899 struct ip6_sf_list __rcu **psf_list; 1900 struct inet6_dev *idev = pmc->idev; 1901 struct net_device *dev = idev->dev; 1902 struct mld2_grec *pgr = NULL; 1903 struct mld2_report *pmr; 1904 unsigned int mtu; 1905 1906 mc_assert_locked(idev); 1907 1908 if (pmc->mca_flags & MAF_NOREPORT) 1909 return skb; 1910 1911 mtu = READ_ONCE(dev->mtu); 1912 if (mtu < IPV6_MIN_MTU) 1913 return skb; 1914 1915 isquery = type == MLD2_MODE_IS_INCLUDE || 1916 type == MLD2_MODE_IS_EXCLUDE; 1917 truncate = type == MLD2_MODE_IS_EXCLUDE || 1918 type == MLD2_CHANGE_TO_EXCLUDE; 1919 1920 stotal = scount = 0; 1921 1922 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1923 1924 if (!rcu_access_pointer(*psf_list)) 1925 goto empty_source; 1926 1927 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1928 1929 /* EX and TO_EX get a fresh packet, if needed */ 1930 if (truncate) { 1931 if (pmr && pmr->mld2r_ngrec && 1932 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1933 if (skb) 1934 mld_sendpack(skb); 1935 skb = mld_newpack(idev, mtu); 1936 } 1937 } 1938 first = 1; 1939 psf_prev = NULL; 1940 for (psf = mc_dereference(*psf_list, idev); 1941 psf; 1942 psf = psf_next) { 1943 struct in6_addr *psrc; 1944 1945 psf_next = mc_dereference(psf->sf_next, idev); 1946 1947 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1948 psf_prev = psf; 1949 continue; 1950 } 1951 1952 /* Based on RFC3810 6.1. Should not send source-list change 1953 * records when there is a filter mode change. 1954 */ 1955 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1956 (!gdeleted && pmc->mca_crcount)) && 1957 (type == MLD2_ALLOW_NEW_SOURCES || 1958 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1959 goto decrease_sf_crcount; 1960 1961 /* clear marks on query responses */ 1962 if (isquery) 1963 psf->sf_gsresp = 0; 1964 1965 if (AVAILABLE(skb) < sizeof(*psrc) + 1966 first*sizeof(struct mld2_grec)) { 1967 if (truncate && !first) 1968 break; /* truncate these */ 1969 if (pgr) 1970 pgr->grec_nsrcs = htons(scount); 1971 if (skb) 1972 mld_sendpack(skb); 1973 skb = mld_newpack(idev, mtu); 1974 first = 1; 1975 scount = 0; 1976 } 1977 if (first) { 1978 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1979 first = 0; 1980 } 1981 if (!skb) 1982 return NULL; 1983 psrc = skb_put(skb, sizeof(*psrc)); 1984 *psrc = psf->sf_addr; 1985 scount++; stotal++; 1986 if ((type == MLD2_ALLOW_NEW_SOURCES || 1987 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1988 decrease_sf_crcount: 1989 psf->sf_crcount--; 1990 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1991 if (psf_prev) 1992 rcu_assign_pointer(psf_prev->sf_next, 1993 mc_dereference(psf->sf_next, idev)); 1994 else 1995 rcu_assign_pointer(*psf_list, 1996 mc_dereference(psf->sf_next, idev)); 1997 kfree_rcu(psf, rcu); 1998 continue; 1999 } 2000 } 2001 psf_prev = psf; 2002 } 2003 2004 empty_source: 2005 if (!stotal) { 2006 if (type == MLD2_ALLOW_NEW_SOURCES || 2007 type == MLD2_BLOCK_OLD_SOURCES) 2008 return skb; 2009 if (pmc->mca_crcount || isquery || crsend) { 2010 /* make sure we have room for group header */ 2011 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 2012 mld_sendpack(skb); 2013 skb = NULL; /* add_grhead will get a new one */ 2014 } 2015 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2016 } 2017 } 2018 if (pgr) 2019 pgr->grec_nsrcs = htons(scount); 2020 2021 if (isquery) 2022 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 2023 return skb; 2024 } 2025 2026 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2027 { 2028 struct sk_buff *skb = NULL; 2029 int type; 2030 2031 mc_assert_locked(idev); 2032 2033 if (!pmc) { 2034 for_each_mc_mclock(idev, pmc) { 2035 if (pmc->mca_flags & MAF_NOREPORT) 2036 continue; 2037 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2038 type = MLD2_MODE_IS_EXCLUDE; 2039 else 2040 type = MLD2_MODE_IS_INCLUDE; 2041 skb = add_grec(skb, pmc, type, 0, 0, 0); 2042 } 2043 } else { 2044 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2045 type = MLD2_MODE_IS_EXCLUDE; 2046 else 2047 type = MLD2_MODE_IS_INCLUDE; 2048 skb = add_grec(skb, pmc, type, 0, 0, 0); 2049 } 2050 if (skb) 2051 mld_sendpack(skb); 2052 } 2053 2054 /* remove zero-count source records from a source filter list */ 2055 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2056 { 2057 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2058 2059 psf_prev = NULL; 2060 for (psf = mc_dereference(*ppsf, idev); 2061 psf; 2062 psf = psf_next) { 2063 psf_next = mc_dereference(psf->sf_next, idev); 2064 if (psf->sf_crcount == 0) { 2065 if (psf_prev) 2066 rcu_assign_pointer(psf_prev->sf_next, 2067 mc_dereference(psf->sf_next, idev)); 2068 else 2069 rcu_assign_pointer(*ppsf, 2070 mc_dereference(psf->sf_next, idev)); 2071 kfree_rcu(psf, rcu); 2072 } else { 2073 psf_prev = psf; 2074 } 2075 } 2076 } 2077 2078 static void mld_send_cr(struct inet6_dev *idev) 2079 { 2080 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2081 struct sk_buff *skb = NULL; 2082 int type, dtype; 2083 2084 /* deleted MCA's */ 2085 pmc_prev = NULL; 2086 for (pmc = mc_dereference(idev->mc_tomb, idev); 2087 pmc; 2088 pmc = pmc_next) { 2089 pmc_next = mc_dereference(pmc->next, idev); 2090 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2091 type = MLD2_BLOCK_OLD_SOURCES; 2092 dtype = MLD2_BLOCK_OLD_SOURCES; 2093 skb = add_grec(skb, pmc, type, 1, 0, 0); 2094 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2095 } 2096 if (pmc->mca_crcount) { 2097 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2098 type = MLD2_CHANGE_TO_INCLUDE; 2099 skb = add_grec(skb, pmc, type, 1, 0, 0); 2100 } 2101 pmc->mca_crcount--; 2102 if (pmc->mca_crcount == 0) { 2103 mld_clear_zeros(&pmc->mca_tomb, idev); 2104 mld_clear_zeros(&pmc->mca_sources, idev); 2105 } 2106 } 2107 if (pmc->mca_crcount == 0 && 2108 !rcu_access_pointer(pmc->mca_tomb) && 2109 !rcu_access_pointer(pmc->mca_sources)) { 2110 if (pmc_prev) 2111 rcu_assign_pointer(pmc_prev->next, pmc_next); 2112 else 2113 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2114 in6_dev_put(pmc->idev); 2115 kfree_rcu(pmc, rcu); 2116 } else 2117 pmc_prev = pmc; 2118 } 2119 2120 /* change recs */ 2121 for_each_mc_mclock(idev, pmc) { 2122 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2123 type = MLD2_BLOCK_OLD_SOURCES; 2124 dtype = MLD2_ALLOW_NEW_SOURCES; 2125 } else { 2126 type = MLD2_ALLOW_NEW_SOURCES; 2127 dtype = MLD2_BLOCK_OLD_SOURCES; 2128 } 2129 skb = add_grec(skb, pmc, type, 0, 0, 0); 2130 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2131 2132 /* filter mode changes */ 2133 if (pmc->mca_crcount) { 2134 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2135 type = MLD2_CHANGE_TO_EXCLUDE; 2136 else 2137 type = MLD2_CHANGE_TO_INCLUDE; 2138 skb = add_grec(skb, pmc, type, 0, 0, 0); 2139 pmc->mca_crcount--; 2140 } 2141 } 2142 if (!skb) 2143 return; 2144 (void) mld_sendpack(skb); 2145 } 2146 2147 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2148 { 2149 const struct in6_addr *snd_addr, *saddr; 2150 int err, len, payload_len, full_len; 2151 struct in6_addr addr_buf; 2152 struct inet6_dev *idev; 2153 struct sk_buff *skb; 2154 struct mld_msg *hdr; 2155 int hlen = LL_RESERVED_SPACE(dev); 2156 int tlen = dev->needed_tailroom; 2157 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2158 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2159 IPV6_TLV_PADN, 0 }; 2160 struct dst_entry *dst; 2161 struct flowi6 fl6; 2162 struct net *net; 2163 struct sock *sk; 2164 2165 if (type == ICMPV6_MGM_REDUCTION) 2166 snd_addr = &in6addr_linklocal_allrouters; 2167 else 2168 snd_addr = addr; 2169 2170 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2171 payload_len = len + sizeof(ra); 2172 full_len = sizeof(struct ipv6hdr) + payload_len; 2173 2174 skb = alloc_skb(hlen + tlen + full_len, GFP_KERNEL); 2175 2176 rcu_read_lock(); 2177 2178 net = dev_net_rcu(dev); 2179 idev = __in6_dev_get(dev); 2180 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 2181 if (!skb) { 2182 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2183 rcu_read_unlock(); 2184 return; 2185 } 2186 sk = net->ipv6.igmp_sk; 2187 skb_set_owner_w(skb, sk); 2188 2189 skb->priority = TC_PRIO_CONTROL; 2190 skb_reserve(skb, hlen); 2191 2192 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2193 /* <draft-ietf-magma-mld-source-05.txt>: 2194 * use unspecified address as the source address 2195 * when a valid link-local address is not available. 2196 */ 2197 saddr = &in6addr_any; 2198 } else 2199 saddr = &addr_buf; 2200 2201 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2202 2203 skb_put_data(skb, ra, sizeof(ra)); 2204 2205 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2206 hdr->mld_type = type; 2207 hdr->mld_mca = *addr; 2208 2209 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2210 IPPROTO_ICMPV6, 2211 csum_partial(hdr, len, 0)); 2212 2213 icmpv6_flow_init(sk, &fl6, type, 2214 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2215 skb->dev->ifindex); 2216 dst = icmp6_dst_alloc(skb->dev, &fl6); 2217 if (IS_ERR(dst)) { 2218 err = PTR_ERR(dst); 2219 goto err_out; 2220 } 2221 2222 skb_dst_set(skb, dst); 2223 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2224 net, sk, skb, NULL, skb->dev, 2225 dst_output); 2226 out: 2227 if (!err) { 2228 ICMP6MSGOUT_INC_STATS(net, idev, type); 2229 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2230 } else 2231 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2232 2233 rcu_read_unlock(); 2234 return; 2235 2236 err_out: 2237 kfree_skb(skb); 2238 goto out; 2239 } 2240 2241 static void mld_send_initial_cr(struct inet6_dev *idev) 2242 { 2243 struct ifmcaddr6 *pmc; 2244 struct sk_buff *skb; 2245 int type; 2246 2247 mc_assert_locked(idev); 2248 2249 if (mld_in_v1_mode(idev)) 2250 return; 2251 2252 skb = NULL; 2253 for_each_mc_mclock(idev, pmc) { 2254 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2255 type = MLD2_CHANGE_TO_EXCLUDE; 2256 else 2257 type = MLD2_ALLOW_NEW_SOURCES; 2258 skb = add_grec(skb, pmc, type, 0, 0, 1); 2259 } 2260 if (skb) 2261 mld_sendpack(skb); 2262 } 2263 2264 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2265 { 2266 mutex_lock(&idev->mc_lock); 2267 idev->mc_dad_count = idev->mc_qrv; 2268 if (idev->mc_dad_count) { 2269 mld_send_initial_cr(idev); 2270 idev->mc_dad_count--; 2271 if (idev->mc_dad_count) 2272 mld_dad_start_work(idev, 2273 unsolicited_report_interval(idev)); 2274 } 2275 mutex_unlock(&idev->mc_lock); 2276 } 2277 2278 static void mld_dad_work(struct work_struct *work) 2279 { 2280 struct inet6_dev *idev = container_of(to_delayed_work(work), 2281 struct inet6_dev, 2282 mc_dad_work); 2283 mutex_lock(&idev->mc_lock); 2284 mld_send_initial_cr(idev); 2285 if (idev->mc_dad_count) { 2286 idev->mc_dad_count--; 2287 if (idev->mc_dad_count) 2288 mld_dad_start_work(idev, 2289 unsolicited_report_interval(idev)); 2290 } 2291 mutex_unlock(&idev->mc_lock); 2292 in6_dev_put(idev); 2293 } 2294 2295 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2296 const struct in6_addr *psfsrc) 2297 { 2298 struct ip6_sf_list *psf, *psf_prev; 2299 int rv = 0; 2300 2301 mc_assert_locked(pmc->idev); 2302 2303 psf_prev = NULL; 2304 for_each_psf_mclock(pmc, psf) { 2305 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2306 break; 2307 psf_prev = psf; 2308 } 2309 if (!psf || psf->sf_count[sfmode] == 0) { 2310 /* source filter not found, or count wrong => bug */ 2311 return -ESRCH; 2312 } 2313 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1); 2314 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2315 struct inet6_dev *idev = pmc->idev; 2316 2317 /* no more filters for this source */ 2318 if (psf_prev) 2319 rcu_assign_pointer(psf_prev->sf_next, 2320 mc_dereference(psf->sf_next, idev)); 2321 else 2322 rcu_assign_pointer(pmc->mca_sources, 2323 mc_dereference(psf->sf_next, idev)); 2324 2325 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2326 !mld_in_v1_mode(idev)) { 2327 psf->sf_crcount = idev->mc_qrv; 2328 rcu_assign_pointer(psf->sf_next, 2329 mc_dereference(pmc->mca_tomb, idev)); 2330 rcu_assign_pointer(pmc->mca_tomb, psf); 2331 rv = 1; 2332 } else { 2333 kfree_rcu(psf, rcu); 2334 } 2335 } 2336 return rv; 2337 } 2338 2339 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2340 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2341 int delta) 2342 { 2343 struct ifmcaddr6 *pmc; 2344 int changerec = 0; 2345 int i, err; 2346 2347 if (!idev) 2348 return -ENODEV; 2349 2350 mc_assert_locked(idev); 2351 2352 for_each_mc_mclock(idev, pmc) { 2353 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2354 break; 2355 } 2356 if (!pmc) 2357 return -ESRCH; 2358 2359 sf_markstate(pmc); 2360 if (!delta) { 2361 if (!pmc->mca_sfcount[sfmode]) 2362 return -EINVAL; 2363 2364 pmc->mca_sfcount[sfmode]--; 2365 } 2366 err = 0; 2367 for (i = 0; i < sfcount; i++) { 2368 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2369 2370 changerec |= rv > 0; 2371 if (!err && rv < 0) 2372 err = rv; 2373 } 2374 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2375 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2376 pmc->mca_sfcount[MCAST_INCLUDE]) { 2377 struct ip6_sf_list *psf; 2378 2379 /* filter mode change */ 2380 pmc->mca_sfmode = MCAST_INCLUDE; 2381 pmc->mca_crcount = idev->mc_qrv; 2382 idev->mc_ifc_count = pmc->mca_crcount; 2383 for_each_psf_mclock(pmc, psf) 2384 psf->sf_crcount = 0; 2385 mld_ifc_event(pmc->idev); 2386 } else if (sf_setstate(pmc) || changerec) { 2387 mld_ifc_event(pmc->idev); 2388 } 2389 2390 return err; 2391 } 2392 2393 /* Add multicast single-source filter to the interface list */ 2394 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2395 const struct in6_addr *psfsrc) 2396 { 2397 struct ip6_sf_list *psf, *psf_prev; 2398 2399 mc_assert_locked(pmc->idev); 2400 2401 psf_prev = NULL; 2402 for_each_psf_mclock(pmc, psf) { 2403 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2404 break; 2405 psf_prev = psf; 2406 } 2407 if (!psf) { 2408 psf = kzalloc_obj(*psf); 2409 if (!psf) 2410 return -ENOBUFS; 2411 2412 psf->sf_addr = *psfsrc; 2413 if (psf_prev) { 2414 rcu_assign_pointer(psf_prev->sf_next, psf); 2415 } else { 2416 rcu_assign_pointer(pmc->mca_sources, psf); 2417 } 2418 } 2419 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1); 2420 return 0; 2421 } 2422 2423 static void sf_markstate(struct ifmcaddr6 *pmc) 2424 { 2425 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2426 struct ip6_sf_list *psf; 2427 2428 mc_assert_locked(pmc->idev); 2429 2430 for_each_psf_mclock(pmc, psf) { 2431 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2432 psf->sf_oldin = mca_xcount == 2433 psf->sf_count[MCAST_EXCLUDE] && 2434 !psf->sf_count[MCAST_INCLUDE]; 2435 } else { 2436 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2437 } 2438 } 2439 } 2440 2441 static int sf_setstate(struct ifmcaddr6 *pmc) 2442 { 2443 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2444 struct ip6_sf_list *psf, *dpsf; 2445 int qrv = pmc->idev->mc_qrv; 2446 int new_in, rv; 2447 2448 mc_assert_locked(pmc->idev); 2449 2450 rv = 0; 2451 for_each_psf_mclock(pmc, psf) { 2452 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2453 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2454 !psf->sf_count[MCAST_INCLUDE]; 2455 } else 2456 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2457 if (new_in) { 2458 if (!psf->sf_oldin) { 2459 struct ip6_sf_list *prev = NULL; 2460 2461 for_each_psf_tomb(pmc, dpsf) { 2462 if (ipv6_addr_equal(&dpsf->sf_addr, 2463 &psf->sf_addr)) 2464 break; 2465 prev = dpsf; 2466 } 2467 if (dpsf) { 2468 if (prev) 2469 rcu_assign_pointer(prev->sf_next, 2470 mc_dereference(dpsf->sf_next, 2471 pmc->idev)); 2472 else 2473 rcu_assign_pointer(pmc->mca_tomb, 2474 mc_dereference(dpsf->sf_next, 2475 pmc->idev)); 2476 kfree_rcu(dpsf, rcu); 2477 } 2478 psf->sf_crcount = qrv; 2479 rv++; 2480 } 2481 } else if (psf->sf_oldin) { 2482 psf->sf_crcount = 0; 2483 /* 2484 * add or update "delete" records if an active filter 2485 * is now inactive 2486 */ 2487 2488 for_each_psf_tomb(pmc, dpsf) 2489 if (ipv6_addr_equal(&dpsf->sf_addr, 2490 &psf->sf_addr)) 2491 break; 2492 if (!dpsf) { 2493 dpsf = kmalloc_obj(*dpsf); 2494 if (!dpsf) 2495 continue; 2496 *dpsf = *psf; 2497 rcu_assign_pointer(dpsf->sf_next, 2498 mc_dereference(pmc->mca_tomb, pmc->idev)); 2499 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2500 } 2501 dpsf->sf_crcount = qrv; 2502 rv++; 2503 } 2504 } 2505 return rv; 2506 } 2507 2508 /* Add multicast source filter list to the interface list */ 2509 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2510 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2511 int delta) 2512 { 2513 struct ifmcaddr6 *pmc; 2514 int isexclude; 2515 int i, err; 2516 2517 if (!idev) 2518 return -ENODEV; 2519 2520 mc_assert_locked(idev); 2521 2522 for_each_mc_mclock(idev, pmc) { 2523 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2524 break; 2525 } 2526 if (!pmc) 2527 return -ESRCH; 2528 2529 sf_markstate(pmc); 2530 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2531 if (!delta) 2532 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2533 pmc->mca_sfcount[sfmode] + 1); 2534 err = 0; 2535 for (i = 0; i < sfcount; i++) { 2536 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2537 if (err) 2538 break; 2539 } 2540 if (err) { 2541 int j; 2542 2543 if (!delta) 2544 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2545 pmc->mca_sfcount[sfmode] - 1); 2546 for (j = 0; j < i; j++) 2547 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2548 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2549 struct ip6_sf_list *psf; 2550 2551 /* filter mode change */ 2552 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2553 pmc->mca_sfmode = MCAST_EXCLUDE; 2554 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2555 pmc->mca_sfmode = MCAST_INCLUDE; 2556 /* else no filters; keep old mode for reports */ 2557 2558 pmc->mca_crcount = idev->mc_qrv; 2559 idev->mc_ifc_count = pmc->mca_crcount; 2560 for_each_psf_mclock(pmc, psf) 2561 psf->sf_crcount = 0; 2562 mld_ifc_event(idev); 2563 } else if (sf_setstate(pmc)) { 2564 mld_ifc_event(idev); 2565 } 2566 return err; 2567 } 2568 2569 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2570 { 2571 struct ip6_sf_list *psf, *nextpsf; 2572 2573 mc_assert_locked(pmc->idev); 2574 2575 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2576 psf; 2577 psf = nextpsf) { 2578 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2579 kfree_rcu(psf, rcu); 2580 } 2581 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2582 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2583 psf; 2584 psf = nextpsf) { 2585 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2586 kfree_rcu(psf, rcu); 2587 } 2588 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2589 pmc->mca_sfmode = MCAST_EXCLUDE; 2590 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2591 /* Paired with the READ_ONCE() from ipv6_chk_mcast_addr() */ 2592 WRITE_ONCE(pmc->mca_sfcount[MCAST_EXCLUDE], 1); 2593 } 2594 2595 static void igmp6_join_group(struct ifmcaddr6 *ma) 2596 { 2597 unsigned long delay; 2598 2599 mc_assert_locked(ma->idev); 2600 2601 if (ma->mca_flags & MAF_NOREPORT) 2602 return; 2603 2604 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2605 2606 delay = get_random_u32_below(unsolicited_report_interval(ma->idev)); 2607 2608 if (cancel_delayed_work(&ma->mca_work)) { 2609 refcount_dec(&ma->mca_refcnt); 2610 delay = ma->mca_work.timer.expires - jiffies; 2611 } 2612 2613 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2614 refcount_inc(&ma->mca_refcnt); 2615 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2616 } 2617 2618 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2619 struct inet6_dev *idev) 2620 { 2621 struct ip6_sf_socklist *psl; 2622 int err; 2623 2624 psl = sock_dereference(iml->sflist, sk); 2625 2626 if (idev) 2627 mutex_lock(&idev->mc_lock); 2628 2629 if (!psl) { 2630 /* any-source empty exclude case */ 2631 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2632 } else { 2633 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2634 psl->sl_count, psl->sl_addr, 0); 2635 RCU_INIT_POINTER(iml->sflist, NULL); 2636 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2637 &sk->sk_omem_alloc); 2638 kfree_rcu(psl, rcu); 2639 } 2640 2641 if (idev) 2642 mutex_unlock(&idev->mc_lock); 2643 2644 return err; 2645 } 2646 2647 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2648 { 2649 mc_assert_locked(ma->idev); 2650 2651 if (mld_in_v1_mode(ma->idev)) { 2652 if (ma->mca_flags & MAF_LAST_REPORTER) { 2653 igmp6_send(&ma->mca_addr, ma->idev->dev, 2654 ICMPV6_MGM_REDUCTION); 2655 } 2656 } else { 2657 mld_add_delrec(ma->idev, ma); 2658 mld_ifc_event(ma->idev); 2659 } 2660 } 2661 2662 static void mld_gq_work(struct work_struct *work) 2663 { 2664 struct inet6_dev *idev = container_of(to_delayed_work(work), 2665 struct inet6_dev, 2666 mc_gq_work); 2667 2668 mutex_lock(&idev->mc_lock); 2669 mld_send_report(idev, NULL); 2670 idev->mc_gq_running = 0; 2671 mutex_unlock(&idev->mc_lock); 2672 2673 in6_dev_put(idev); 2674 } 2675 2676 static void mld_ifc_work(struct work_struct *work) 2677 { 2678 struct inet6_dev *idev = container_of(to_delayed_work(work), 2679 struct inet6_dev, 2680 mc_ifc_work); 2681 2682 mutex_lock(&idev->mc_lock); 2683 mld_send_cr(idev); 2684 2685 if (idev->mc_ifc_count) { 2686 idev->mc_ifc_count--; 2687 if (idev->mc_ifc_count) 2688 mld_ifc_start_work(idev, 2689 unsolicited_report_interval(idev)); 2690 } 2691 mutex_unlock(&idev->mc_lock); 2692 in6_dev_put(idev); 2693 } 2694 2695 static void mld_ifc_event(struct inet6_dev *idev) 2696 { 2697 mc_assert_locked(idev); 2698 2699 if (mld_in_v1_mode(idev)) 2700 return; 2701 2702 idev->mc_ifc_count = idev->mc_qrv; 2703 mld_ifc_start_work(idev, 1); 2704 } 2705 2706 static void mld_mca_work(struct work_struct *work) 2707 { 2708 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2709 struct ifmcaddr6, mca_work); 2710 2711 mutex_lock(&ma->idev->mc_lock); 2712 if (mld_in_v1_mode(ma->idev)) 2713 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2714 else 2715 mld_send_report(ma->idev, ma); 2716 ma->mca_flags |= MAF_LAST_REPORTER; 2717 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2718 mutex_unlock(&ma->idev->mc_lock); 2719 2720 ma_put(ma); 2721 } 2722 2723 /* Device changing type */ 2724 2725 void ipv6_mc_unmap(struct inet6_dev *idev) 2726 { 2727 struct ifmcaddr6 *i; 2728 2729 /* Install multicast list, except for all-nodes (already installed) */ 2730 2731 mutex_lock(&idev->mc_lock); 2732 for_each_mc_mclock(idev, i) 2733 igmp6_group_dropped(i); 2734 mutex_unlock(&idev->mc_lock); 2735 } 2736 2737 void ipv6_mc_remap(struct inet6_dev *idev) 2738 { 2739 ipv6_mc_up(idev); 2740 } 2741 2742 /* Device going down */ 2743 void ipv6_mc_down(struct inet6_dev *idev) 2744 { 2745 struct ifmcaddr6 *i; 2746 2747 mutex_lock(&idev->mc_lock); 2748 /* Withdraw multicast list */ 2749 for_each_mc_mclock(idev, i) 2750 igmp6_group_dropped(i); 2751 mutex_unlock(&idev->mc_lock); 2752 2753 /* Should stop work after group drop. or we will 2754 * start work again in mld_ifc_event() 2755 */ 2756 mld_query_stop_work(idev); 2757 mld_report_stop_work(idev); 2758 2759 mutex_lock(&idev->mc_lock); 2760 mld_ifc_stop_work(idev); 2761 mld_gq_stop_work(idev); 2762 mutex_unlock(&idev->mc_lock); 2763 2764 mld_dad_stop_work(idev); 2765 } 2766 2767 static void ipv6_mc_reset(struct inet6_dev *idev) 2768 { 2769 idev->mc_qrv = sysctl_mld_qrv; 2770 idev->mc_qi = MLD_QI_DEFAULT; 2771 idev->mc_qri = MLD_QRI_DEFAULT; 2772 idev->mc_v1_seen = 0; 2773 idev->mc_maxdelay = unsolicited_report_interval(idev); 2774 } 2775 2776 /* Device going up */ 2777 2778 void ipv6_mc_up(struct inet6_dev *idev) 2779 { 2780 struct ifmcaddr6 *i; 2781 2782 /* Install multicast list, except for all-nodes (already installed) */ 2783 2784 ipv6_mc_reset(idev); 2785 mutex_lock(&idev->mc_lock); 2786 for_each_mc_mclock(idev, i) { 2787 mld_del_delrec(idev, i); 2788 igmp6_group_added(i); 2789 } 2790 mutex_unlock(&idev->mc_lock); 2791 } 2792 2793 /* IPv6 device initialization. */ 2794 2795 void ipv6_mc_init_dev(struct inet6_dev *idev) 2796 { 2797 idev->mc_gq_running = 0; 2798 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2799 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2800 idev->mc_ifc_count = 0; 2801 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2802 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2803 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2804 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2805 skb_queue_head_init(&idev->mc_query_queue); 2806 skb_queue_head_init(&idev->mc_report_queue); 2807 spin_lock_init(&idev->mc_query_lock); 2808 spin_lock_init(&idev->mc_report_lock); 2809 mutex_init(&idev->mc_lock); 2810 ipv6_mc_reset(idev); 2811 } 2812 2813 /* 2814 * Device is about to be destroyed: clean up. 2815 */ 2816 2817 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2818 { 2819 struct ifmcaddr6 *i; 2820 2821 /* Deactivate works */ 2822 ipv6_mc_down(idev); 2823 mutex_lock(&idev->mc_lock); 2824 mld_clear_delrec(idev); 2825 mutex_unlock(&idev->mc_lock); 2826 mld_clear_query(idev); 2827 mld_clear_report(idev); 2828 2829 /* Delete all-nodes address. */ 2830 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2831 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2832 * fail. 2833 */ 2834 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2835 2836 if (idev->cnf.forwarding) 2837 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2838 2839 mutex_lock(&idev->mc_lock); 2840 while ((i = mc_dereference(idev->mc_list, idev))) { 2841 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2842 2843 ip6_mc_clear_src(i); 2844 ma_put(i); 2845 } 2846 mutex_unlock(&idev->mc_lock); 2847 } 2848 2849 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2850 { 2851 struct ifmcaddr6 *pmc; 2852 2853 mutex_lock(&idev->mc_lock); 2854 if (mld_in_v1_mode(idev)) { 2855 for_each_mc_mclock(idev, pmc) 2856 igmp6_join_group(pmc); 2857 } else { 2858 mld_send_report(idev, NULL); 2859 } 2860 mutex_unlock(&idev->mc_lock); 2861 } 2862 2863 static int ipv6_mc_netdev_event(struct notifier_block *this, 2864 unsigned long event, 2865 void *ptr) 2866 { 2867 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2868 struct inet6_dev *idev = __in6_dev_get(dev); 2869 2870 switch (event) { 2871 case NETDEV_RESEND_IGMP: 2872 if (idev) 2873 ipv6_mc_rejoin_groups(idev); 2874 break; 2875 default: 2876 break; 2877 } 2878 2879 return NOTIFY_DONE; 2880 } 2881 2882 static struct notifier_block igmp6_netdev_notifier = { 2883 .notifier_call = ipv6_mc_netdev_event, 2884 }; 2885 2886 #ifdef CONFIG_PROC_FS 2887 struct igmp6_mc_iter_state { 2888 struct seq_net_private p; 2889 struct net_device *dev; 2890 struct inet6_dev *idev; 2891 }; 2892 2893 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2894 2895 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2896 { 2897 struct ifmcaddr6 *im = NULL; 2898 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2899 struct net *net = seq_file_net(seq); 2900 2901 state->idev = NULL; 2902 for_each_netdev_rcu(net, state->dev) { 2903 struct inet6_dev *idev; 2904 idev = __in6_dev_get(state->dev); 2905 if (!idev) 2906 continue; 2907 2908 im = rcu_dereference(idev->mc_list); 2909 if (im) { 2910 state->idev = idev; 2911 break; 2912 } 2913 } 2914 return im; 2915 } 2916 2917 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2918 { 2919 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2920 2921 im = rcu_dereference(im->next); 2922 while (!im) { 2923 state->dev = next_net_device_rcu(state->dev); 2924 if (!state->dev) { 2925 state->idev = NULL; 2926 break; 2927 } 2928 state->idev = __in6_dev_get(state->dev); 2929 if (!state->idev) 2930 continue; 2931 im = rcu_dereference(state->idev->mc_list); 2932 } 2933 return im; 2934 } 2935 2936 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2937 { 2938 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2939 if (im) 2940 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2941 --pos; 2942 return pos ? NULL : im; 2943 } 2944 2945 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2946 __acquires(RCU) 2947 { 2948 rcu_read_lock(); 2949 return igmp6_mc_get_idx(seq, *pos); 2950 } 2951 2952 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2953 { 2954 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2955 2956 ++*pos; 2957 return im; 2958 } 2959 2960 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2961 __releases(RCU) 2962 { 2963 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2964 2965 if (likely(state->idev)) 2966 state->idev = NULL; 2967 state->dev = NULL; 2968 rcu_read_unlock(); 2969 } 2970 2971 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2972 { 2973 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2974 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2975 2976 seq_printf(seq, 2977 "%-4d %-15s %pi6 %5d %08X %ld\n", 2978 state->dev->ifindex, state->dev->name, 2979 &im->mca_addr, 2980 READ_ONCE(im->mca_users), im->mca_flags, 2981 (im->mca_flags & MAF_TIMER_RUNNING) ? 2982 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2983 return 0; 2984 } 2985 2986 static const struct seq_operations igmp6_mc_seq_ops = { 2987 .start = igmp6_mc_seq_start, 2988 .next = igmp6_mc_seq_next, 2989 .stop = igmp6_mc_seq_stop, 2990 .show = igmp6_mc_seq_show, 2991 }; 2992 2993 struct igmp6_mcf_iter_state { 2994 struct seq_net_private p; 2995 struct net_device *dev; 2996 struct inet6_dev *idev; 2997 struct ifmcaddr6 *im; 2998 }; 2999 3000 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 3001 3002 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 3003 { 3004 struct ip6_sf_list *psf = NULL; 3005 struct ifmcaddr6 *im = NULL; 3006 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3007 struct net *net = seq_file_net(seq); 3008 3009 state->idev = NULL; 3010 state->im = NULL; 3011 for_each_netdev_rcu(net, state->dev) { 3012 struct inet6_dev *idev; 3013 idev = __in6_dev_get(state->dev); 3014 if (unlikely(idev == NULL)) 3015 continue; 3016 3017 im = rcu_dereference(idev->mc_list); 3018 if (likely(im)) { 3019 psf = rcu_dereference(im->mca_sources); 3020 if (likely(psf)) { 3021 state->im = im; 3022 state->idev = idev; 3023 break; 3024 } 3025 } 3026 } 3027 return psf; 3028 } 3029 3030 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3031 { 3032 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3033 3034 psf = rcu_dereference(psf->sf_next); 3035 while (!psf) { 3036 state->im = rcu_dereference(state->im->next); 3037 while (!state->im) { 3038 state->dev = next_net_device_rcu(state->dev); 3039 if (!state->dev) { 3040 state->idev = NULL; 3041 goto out; 3042 } 3043 state->idev = __in6_dev_get(state->dev); 3044 if (!state->idev) 3045 continue; 3046 state->im = rcu_dereference(state->idev->mc_list); 3047 } 3048 psf = rcu_dereference(state->im->mca_sources); 3049 } 3050 out: 3051 return psf; 3052 } 3053 3054 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3055 { 3056 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3057 if (psf) 3058 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3059 --pos; 3060 return pos ? NULL : psf; 3061 } 3062 3063 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3064 __acquires(RCU) 3065 { 3066 rcu_read_lock(); 3067 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3068 } 3069 3070 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3071 { 3072 struct ip6_sf_list *psf; 3073 if (v == SEQ_START_TOKEN) 3074 psf = igmp6_mcf_get_first(seq); 3075 else 3076 psf = igmp6_mcf_get_next(seq, v); 3077 ++*pos; 3078 return psf; 3079 } 3080 3081 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3082 __releases(RCU) 3083 { 3084 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3085 3086 if (likely(state->im)) 3087 state->im = NULL; 3088 if (likely(state->idev)) 3089 state->idev = NULL; 3090 3091 state->dev = NULL; 3092 rcu_read_unlock(); 3093 } 3094 3095 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3096 { 3097 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3098 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3099 3100 if (v == SEQ_START_TOKEN) { 3101 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3102 } else { 3103 seq_printf(seq, 3104 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3105 state->dev->ifindex, state->dev->name, 3106 &state->im->mca_addr, 3107 &psf->sf_addr, 3108 READ_ONCE(psf->sf_count[MCAST_INCLUDE]), 3109 READ_ONCE(psf->sf_count[MCAST_EXCLUDE])); 3110 } 3111 return 0; 3112 } 3113 3114 static const struct seq_operations igmp6_mcf_seq_ops = { 3115 .start = igmp6_mcf_seq_start, 3116 .next = igmp6_mcf_seq_next, 3117 .stop = igmp6_mcf_seq_stop, 3118 .show = igmp6_mcf_seq_show, 3119 }; 3120 3121 static int __net_init igmp6_proc_init(struct net *net) 3122 { 3123 int err; 3124 3125 err = -ENOMEM; 3126 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3127 sizeof(struct igmp6_mc_iter_state))) 3128 goto out; 3129 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3130 &igmp6_mcf_seq_ops, 3131 sizeof(struct igmp6_mcf_iter_state))) 3132 goto out_proc_net_igmp6; 3133 3134 err = 0; 3135 out: 3136 return err; 3137 3138 out_proc_net_igmp6: 3139 remove_proc_entry("igmp6", net->proc_net); 3140 goto out; 3141 } 3142 3143 static void __net_exit igmp6_proc_exit(struct net *net) 3144 { 3145 remove_proc_entry("mcfilter6", net->proc_net); 3146 remove_proc_entry("igmp6", net->proc_net); 3147 } 3148 #else 3149 static inline int igmp6_proc_init(struct net *net) 3150 { 3151 return 0; 3152 } 3153 static inline void igmp6_proc_exit(struct net *net) 3154 { 3155 } 3156 #endif 3157 3158 static int __net_init igmp6_net_init(struct net *net) 3159 { 3160 int err; 3161 3162 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3163 SOCK_RAW, IPPROTO_ICMPV6, net); 3164 if (err < 0) { 3165 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3166 err); 3167 goto out; 3168 } 3169 3170 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3171 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3172 3173 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3174 SOCK_RAW, IPPROTO_ICMPV6, net); 3175 if (err < 0) { 3176 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3177 err); 3178 goto out_sock_create; 3179 } 3180 3181 err = igmp6_proc_init(net); 3182 if (err) 3183 goto out_sock_create_autojoin; 3184 3185 return 0; 3186 3187 out_sock_create_autojoin: 3188 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3189 out_sock_create: 3190 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3191 out: 3192 return err; 3193 } 3194 3195 static void __net_exit igmp6_net_exit(struct net *net) 3196 { 3197 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3198 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3199 igmp6_proc_exit(net); 3200 } 3201 3202 static struct pernet_operations igmp6_net_ops = { 3203 .init = igmp6_net_init, 3204 .exit = igmp6_net_exit, 3205 }; 3206 3207 int __init igmp6_init(void) 3208 { 3209 int err; 3210 3211 err = register_pernet_subsys(&igmp6_net_ops); 3212 if (err) 3213 return err; 3214 3215 mld_wq = create_workqueue("mld"); 3216 if (!mld_wq) { 3217 unregister_pernet_subsys(&igmp6_net_ops); 3218 return -ENOMEM; 3219 } 3220 3221 return err; 3222 } 3223 3224 int __init igmp6_late_init(void) 3225 { 3226 return register_netdevice_notifier(&igmp6_netdev_notifier); 3227 } 3228 3229 void igmp6_cleanup(void) 3230 { 3231 unregister_pernet_subsys(&igmp6_net_ops); 3232 destroy_workqueue(mld_wq); 3233 } 3234 3235 void igmp6_late_cleanup(void) 3236 { 3237 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3238 } 3239