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 /* 173 * socket join on multicast group 174 */ 175 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, 176 const struct in6_addr *addr, unsigned int mode) 177 { 178 struct ipv6_pinfo *np = inet6_sk(sk); 179 struct ipv6_mc_socklist *mc_lst; 180 struct net *net = sock_net(sk); 181 struct net_device *dev = NULL; 182 int err; 183 184 if (!ipv6_addr_is_multicast(addr)) 185 return -EINVAL; 186 187 for_each_pmc_socklock(np, sk, mc_lst) { 188 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 189 ipv6_addr_equal(&mc_lst->addr, addr)) 190 return -EADDRINUSE; 191 } 192 193 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 194 195 if (!mc_lst) 196 return -ENOMEM; 197 198 mc_lst->next = NULL; 199 mc_lst->addr = *addr; 200 201 if (ifindex == 0) { 202 struct rt6_info *rt; 203 204 rcu_read_lock(); 205 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); 206 if (rt) { 207 dev = dst_dev(&rt->dst); 208 dev_hold(dev); 209 ip6_rt_put(rt); 210 } 211 rcu_read_unlock(); 212 } else { 213 dev = dev_get_by_index(net, ifindex); 214 } 215 216 if (!dev) { 217 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 218 return -ENODEV; 219 } 220 221 mc_lst->ifindex = dev->ifindex; 222 mc_lst->sfmode = mode; 223 RCU_INIT_POINTER(mc_lst->sflist, NULL); 224 225 /* now add/increase the group membership on the device */ 226 err = __ipv6_dev_mc_inc(dev, addr, mode); 227 228 dev_put(dev); 229 230 if (err) { 231 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 232 return err; 233 } 234 235 mc_lst->next = np->ipv6_mc_list; 236 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 237 238 return 0; 239 } 240 241 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 242 { 243 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 244 } 245 EXPORT_SYMBOL(ipv6_sock_mc_join); 246 247 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 248 const struct in6_addr *addr, unsigned int mode) 249 { 250 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 251 } 252 253 /* 254 * socket leave on multicast group 255 */ 256 static void __ipv6_sock_mc_drop(struct sock *sk, struct ipv6_mc_socklist *mc_lst) 257 { 258 struct net *net = sock_net(sk); 259 struct net_device *dev; 260 261 dev = dev_get_by_index(net, mc_lst->ifindex); 262 if (dev) { 263 struct inet6_dev *idev = in6_dev_get(dev); 264 265 ip6_mc_leave_src(sk, mc_lst, idev); 266 267 if (idev) { 268 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 269 in6_dev_put(idev); 270 } 271 272 dev_put(dev); 273 } else { 274 ip6_mc_leave_src(sk, mc_lst, NULL); 275 } 276 277 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 278 kfree_rcu(mc_lst, rcu); 279 } 280 281 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 282 { 283 struct ipv6_pinfo *np = inet6_sk(sk); 284 struct ipv6_mc_socklist __rcu **lnk; 285 struct ipv6_mc_socklist *mc_lst; 286 287 if (!ipv6_addr_is_multicast(addr)) 288 return -EINVAL; 289 290 for (lnk = &np->ipv6_mc_list; 291 (mc_lst = sock_dereference(*lnk, sk)) != NULL; 292 lnk = &mc_lst->next) { 293 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 294 ipv6_addr_equal(&mc_lst->addr, addr)) { 295 *lnk = mc_lst->next; 296 __ipv6_sock_mc_drop(sk, mc_lst); 297 return 0; 298 } 299 } 300 301 return -EADDRNOTAVAIL; 302 } 303 EXPORT_SYMBOL(ipv6_sock_mc_drop); 304 305 static struct inet6_dev *ip6_mc_find_dev(struct net *net, 306 const struct in6_addr *group, 307 int ifindex) 308 { 309 struct net_device *dev = NULL; 310 struct inet6_dev *idev; 311 312 if (ifindex == 0) { 313 struct rt6_info *rt; 314 315 rcu_read_lock(); 316 rt = rt6_lookup(net, group, NULL, 0, NULL, 0); 317 if (rt) { 318 dev = dst_dev(&rt->dst); 319 dev_hold(dev); 320 ip6_rt_put(rt); 321 } 322 rcu_read_unlock(); 323 } else { 324 dev = dev_get_by_index(net, ifindex); 325 } 326 if (!dev) 327 return NULL; 328 329 idev = in6_dev_get(dev); 330 dev_put(dev); 331 332 return idev; 333 } 334 335 void __ipv6_sock_mc_close(struct sock *sk) 336 { 337 struct ipv6_pinfo *np = inet6_sk(sk); 338 struct ipv6_mc_socklist *mc_lst; 339 340 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) { 341 np->ipv6_mc_list = mc_lst->next; 342 __ipv6_sock_mc_drop(sk, mc_lst); 343 } 344 } 345 346 void ipv6_sock_mc_close(struct sock *sk) 347 { 348 struct ipv6_pinfo *np = inet6_sk(sk); 349 350 if (!rcu_access_pointer(np->ipv6_mc_list)) 351 return; 352 353 lock_sock(sk); 354 __ipv6_sock_mc_close(sk); 355 release_sock(sk); 356 } 357 358 int ip6_mc_source(int add, int omode, struct sock *sk, 359 struct group_source_req *pgsr) 360 { 361 struct ipv6_pinfo *inet6 = inet6_sk(sk); 362 struct in6_addr *source, *group; 363 struct net *net = sock_net(sk); 364 struct ipv6_mc_socklist *pmc; 365 struct ip6_sf_socklist *psl; 366 struct inet6_dev *idev; 367 int leavegroup = 0; 368 int i, j, rv; 369 int err; 370 371 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 372 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 373 374 if (!ipv6_addr_is_multicast(group)) 375 return -EINVAL; 376 377 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface); 378 if (!idev) 379 return -ENODEV; 380 381 mutex_lock(&idev->mc_lock); 382 383 if (idev->dead) { 384 err = -ENODEV; 385 goto done; 386 } 387 388 err = -EADDRNOTAVAIL; 389 390 for_each_pmc_socklock(inet6, sk, pmc) { 391 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 392 continue; 393 if (ipv6_addr_equal(&pmc->addr, group)) 394 break; 395 } 396 if (!pmc) { /* must have a prior join */ 397 err = -EINVAL; 398 goto done; 399 } 400 /* if a source filter was set, must be the same mode as before */ 401 if (rcu_access_pointer(pmc->sflist)) { 402 if (pmc->sfmode != omode) { 403 err = -EINVAL; 404 goto done; 405 } 406 } else if (pmc->sfmode != omode) { 407 /* allow mode switches for empty-set filters */ 408 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 409 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 410 pmc->sfmode = omode; 411 } 412 413 psl = sock_dereference(pmc->sflist, sk); 414 if (!add) { 415 if (!psl) 416 goto done; /* err = -EADDRNOTAVAIL */ 417 rv = !0; 418 for (i = 0; i < psl->sl_count; i++) { 419 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 420 if (rv == 0) 421 break; 422 } 423 if (rv) /* source not found */ 424 goto done; /* err = -EADDRNOTAVAIL */ 425 426 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 427 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 428 leavegroup = 1; 429 goto done; 430 } 431 432 /* update the interface filter */ 433 ip6_mc_del_src(idev, group, omode, 1, source, 1); 434 435 for (j = i+1; j < psl->sl_count; j++) 436 psl->sl_addr[j-1] = psl->sl_addr[j]; 437 psl->sl_count--; 438 err = 0; 439 goto done; 440 } 441 /* else, add a new source to the filter */ 442 443 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 444 err = -ENOBUFS; 445 goto done; 446 } 447 if (!psl || psl->sl_count == psl->sl_max) { 448 struct ip6_sf_socklist *newpsl; 449 int count = IP6_SFBLOCK; 450 451 if (psl) 452 count += psl->sl_max; 453 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), 454 GFP_KERNEL); 455 if (!newpsl) { 456 err = -ENOBUFS; 457 goto done; 458 } 459 newpsl->sl_max = count; 460 newpsl->sl_count = count - IP6_SFBLOCK; 461 if (psl) { 462 for (i = 0; i < psl->sl_count; i++) 463 newpsl->sl_addr[i] = psl->sl_addr[i]; 464 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 465 &sk->sk_omem_alloc); 466 } 467 rcu_assign_pointer(pmc->sflist, newpsl); 468 kfree_rcu(psl, rcu); 469 psl = newpsl; 470 } 471 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 472 for (i = 0; i < psl->sl_count; i++) { 473 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 474 if (rv == 0) /* There is an error in the address. */ 475 goto done; 476 } 477 for (j = psl->sl_count-1; j >= i; j--) 478 psl->sl_addr[j+1] = psl->sl_addr[j]; 479 psl->sl_addr[i] = *source; 480 psl->sl_count++; 481 err = 0; 482 /* update the interface list */ 483 ip6_mc_add_src(idev, group, omode, 1, source, 1); 484 done: 485 mutex_unlock(&idev->mc_lock); 486 in6_dev_put(idev); 487 if (leavegroup) 488 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 489 return err; 490 } 491 492 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 493 struct sockaddr_storage *list) 494 { 495 struct ipv6_pinfo *inet6 = inet6_sk(sk); 496 struct ip6_sf_socklist *newpsl, *psl; 497 struct net *net = sock_net(sk); 498 const struct in6_addr *group; 499 struct ipv6_mc_socklist *pmc; 500 struct inet6_dev *idev; 501 int leavegroup = 0; 502 int i, err; 503 504 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 505 506 if (!ipv6_addr_is_multicast(group)) 507 return -EINVAL; 508 if (gsf->gf_fmode != MCAST_INCLUDE && 509 gsf->gf_fmode != MCAST_EXCLUDE) 510 return -EINVAL; 511 512 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 513 if (!idev) 514 return -ENODEV; 515 516 mutex_lock(&idev->mc_lock); 517 518 if (idev->dead) { 519 err = -ENODEV; 520 goto done; 521 } 522 523 err = 0; 524 525 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 526 leavegroup = 1; 527 goto done; 528 } 529 530 for_each_pmc_socklock(inet6, sk, pmc) { 531 if (pmc->ifindex != gsf->gf_interface) 532 continue; 533 if (ipv6_addr_equal(&pmc->addr, group)) 534 break; 535 } 536 if (!pmc) { /* must have a prior join */ 537 err = -EINVAL; 538 goto done; 539 } 540 if (gsf->gf_numsrc) { 541 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, 542 gsf->gf_numsrc), 543 GFP_KERNEL); 544 if (!newpsl) { 545 err = -ENOBUFS; 546 goto done; 547 } 548 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 549 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 550 struct sockaddr_in6 *psin6; 551 552 psin6 = (struct sockaddr_in6 *)list; 553 newpsl->sl_addr[i] = psin6->sin6_addr; 554 } 555 556 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 557 newpsl->sl_count, newpsl->sl_addr, 0); 558 if (err) { 559 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr, 560 newpsl->sl_max)); 561 goto done; 562 } 563 } else { 564 newpsl = NULL; 565 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 566 } 567 568 psl = sock_dereference(pmc->sflist, sk); 569 if (psl) { 570 ip6_mc_del_src(idev, group, pmc->sfmode, 571 psl->sl_count, psl->sl_addr, 0); 572 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 573 &sk->sk_omem_alloc); 574 } else { 575 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 576 } 577 578 rcu_assign_pointer(pmc->sflist, newpsl); 579 kfree_rcu(psl, rcu); 580 pmc->sfmode = gsf->gf_fmode; 581 err = 0; 582 done: 583 mutex_unlock(&idev->mc_lock); 584 in6_dev_put(idev); 585 if (leavegroup) 586 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 587 return err; 588 } 589 590 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 591 sockptr_t optval, size_t ss_offset) 592 { 593 struct ipv6_pinfo *inet6 = inet6_sk(sk); 594 const struct in6_addr *group; 595 struct ipv6_mc_socklist *pmc; 596 struct ip6_sf_socklist *psl; 597 unsigned int count; 598 int i, copycount; 599 600 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 601 602 if (!ipv6_addr_is_multicast(group)) 603 return -EINVAL; 604 605 for_each_pmc_socklock(inet6, sk, pmc) { 606 if (pmc->ifindex != gsf->gf_interface) 607 continue; 608 if (ipv6_addr_equal(group, &pmc->addr)) 609 break; 610 } 611 if (!pmc) /* must have a prior join */ 612 return -EADDRNOTAVAIL; 613 614 gsf->gf_fmode = pmc->sfmode; 615 psl = sock_dereference(pmc->sflist, sk); 616 count = psl ? psl->sl_count : 0; 617 618 copycount = min(count, gsf->gf_numsrc); 619 gsf->gf_numsrc = count; 620 for (i = 0; i < copycount; i++) { 621 struct sockaddr_in6 *psin6; 622 struct sockaddr_storage ss; 623 624 psin6 = (struct sockaddr_in6 *)&ss; 625 memset(&ss, 0, sizeof(ss)); 626 psin6->sin6_family = AF_INET6; 627 psin6->sin6_addr = psl->sl_addr[i]; 628 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss))) 629 return -EFAULT; 630 ss_offset += sizeof(ss); 631 } 632 return 0; 633 } 634 635 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, 636 const struct in6_addr *src_addr) 637 { 638 const struct ipv6_pinfo *np = inet6_sk(sk); 639 const struct ipv6_mc_socklist *mc; 640 const struct ip6_sf_socklist *psl; 641 bool rv = true; 642 643 rcu_read_lock(); 644 for_each_pmc_rcu(np, mc) { 645 if (ipv6_addr_equal(&mc->addr, mc_addr)) 646 break; 647 } 648 if (!mc) { 649 rcu_read_unlock(); 650 return inet6_test_bit(MC6_ALL, sk); 651 } 652 psl = rcu_dereference(mc->sflist); 653 if (!psl) { 654 rv = mc->sfmode == MCAST_EXCLUDE; 655 } else { 656 int i; 657 658 for (i = 0; i < psl->sl_count; i++) { 659 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 660 break; 661 } 662 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 663 rv = false; 664 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 665 rv = false; 666 } 667 rcu_read_unlock(); 668 669 return rv; 670 } 671 672 static void igmp6_group_added(struct ifmcaddr6 *mc) 673 { 674 struct net_device *dev = mc->idev->dev; 675 char buf[MAX_ADDR_LEN]; 676 677 mc_assert_locked(mc->idev); 678 679 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 680 IPV6_ADDR_SCOPE_LINKLOCAL) 681 return; 682 683 if (!(mc->mca_flags&MAF_LOADED)) { 684 mc->mca_flags |= MAF_LOADED; 685 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 686 dev_mc_add(dev, buf); 687 } 688 689 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 690 return; 691 692 if (mld_in_v1_mode(mc->idev)) { 693 igmp6_join_group(mc); 694 return; 695 } 696 /* else v2 */ 697 698 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 699 * should not send filter-mode change record as the mode 700 * should be from IN() to IN(A). 701 */ 702 if (mc->mca_sfmode == MCAST_EXCLUDE) 703 mc->mca_crcount = mc->idev->mc_qrv; 704 705 mld_ifc_event(mc->idev); 706 } 707 708 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 709 { 710 struct net_device *dev = mc->idev->dev; 711 char buf[MAX_ADDR_LEN]; 712 713 mc_assert_locked(mc->idev); 714 715 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 716 IPV6_ADDR_SCOPE_LINKLOCAL) 717 return; 718 719 if (mc->mca_flags&MAF_LOADED) { 720 mc->mca_flags &= ~MAF_LOADED; 721 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 722 dev_mc_del(dev, buf); 723 } 724 725 if (mc->mca_flags & MAF_NOREPORT) 726 return; 727 728 if (!mc->idev->dead) 729 igmp6_leave_group(mc); 730 731 if (cancel_delayed_work(&mc->mca_work)) 732 refcount_dec(&mc->mca_refcnt); 733 } 734 735 /* deleted ifmcaddr6 manipulation */ 736 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 737 { 738 struct ifmcaddr6 *pmc; 739 740 mc_assert_locked(idev); 741 742 /* this is an "ifmcaddr6" for convenience; only the fields below 743 * are actually used. In particular, the refcnt and users are not 744 * used for management of the delete list. Using the same structure 745 * for deleted items allows change reports to use common code with 746 * non-deleted or query-response MCA's. 747 */ 748 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 749 if (!pmc) 750 return; 751 752 pmc->idev = im->idev; 753 in6_dev_hold(idev); 754 pmc->mca_addr = im->mca_addr; 755 pmc->mca_crcount = idev->mc_qrv; 756 pmc->mca_sfmode = im->mca_sfmode; 757 if (pmc->mca_sfmode == MCAST_INCLUDE) { 758 struct ip6_sf_list *psf; 759 760 rcu_assign_pointer(pmc->mca_tomb, 761 mc_dereference(im->mca_tomb, idev)); 762 rcu_assign_pointer(pmc->mca_sources, 763 mc_dereference(im->mca_sources, idev)); 764 RCU_INIT_POINTER(im->mca_tomb, NULL); 765 RCU_INIT_POINTER(im->mca_sources, NULL); 766 767 for_each_psf_mclock(pmc, psf) 768 psf->sf_crcount = pmc->mca_crcount; 769 } 770 771 rcu_assign_pointer(pmc->next, idev->mc_tomb); 772 rcu_assign_pointer(idev->mc_tomb, pmc); 773 } 774 775 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 776 { 777 struct ip6_sf_list *psf, *sources, *tomb; 778 struct in6_addr *pmca = &im->mca_addr; 779 struct ifmcaddr6 *pmc, *pmc_prev; 780 781 mc_assert_locked(idev); 782 783 pmc_prev = NULL; 784 for_each_mc_tomb(idev, pmc) { 785 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 786 break; 787 pmc_prev = pmc; 788 } 789 if (!pmc) 790 return; 791 if (pmc_prev) 792 rcu_assign_pointer(pmc_prev->next, pmc->next); 793 else 794 rcu_assign_pointer(idev->mc_tomb, pmc->next); 795 796 im->idev = pmc->idev; 797 if (im->mca_sfmode == MCAST_INCLUDE) { 798 tomb = rcu_replace_pointer(im->mca_tomb, 799 mc_dereference(pmc->mca_tomb, pmc->idev), 800 lockdep_is_held(&im->idev->mc_lock)); 801 rcu_assign_pointer(pmc->mca_tomb, tomb); 802 803 sources = rcu_replace_pointer(im->mca_sources, 804 mc_dereference(pmc->mca_sources, pmc->idev), 805 lockdep_is_held(&im->idev->mc_lock)); 806 rcu_assign_pointer(pmc->mca_sources, sources); 807 for_each_psf_mclock(im, psf) 808 psf->sf_crcount = idev->mc_qrv; 809 } else { 810 im->mca_crcount = idev->mc_qrv; 811 } 812 ip6_mc_clear_src(pmc); 813 in6_dev_put(pmc->idev); 814 kfree_rcu(pmc, rcu); 815 } 816 817 static void mld_clear_delrec(struct inet6_dev *idev) 818 { 819 struct ifmcaddr6 *pmc, *nextpmc; 820 821 mc_assert_locked(idev); 822 823 pmc = mc_dereference(idev->mc_tomb, idev); 824 RCU_INIT_POINTER(idev->mc_tomb, NULL); 825 826 for (; pmc; pmc = nextpmc) { 827 nextpmc = mc_dereference(pmc->next, idev); 828 ip6_mc_clear_src(pmc); 829 in6_dev_put(pmc->idev); 830 kfree_rcu(pmc, rcu); 831 } 832 833 /* clear dead sources, too */ 834 for_each_mc_mclock(idev, pmc) { 835 struct ip6_sf_list *psf, *psf_next; 836 837 psf = mc_dereference(pmc->mca_tomb, idev); 838 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 839 for (; psf; psf = psf_next) { 840 psf_next = mc_dereference(psf->sf_next, idev); 841 kfree_rcu(psf, rcu); 842 } 843 } 844 } 845 846 static void mld_clear_query(struct inet6_dev *idev) 847 { 848 spin_lock_bh(&idev->mc_query_lock); 849 __skb_queue_purge(&idev->mc_query_queue); 850 spin_unlock_bh(&idev->mc_query_lock); 851 } 852 853 static void mld_clear_report(struct inet6_dev *idev) 854 { 855 spin_lock_bh(&idev->mc_report_lock); 856 __skb_queue_purge(&idev->mc_report_queue); 857 spin_unlock_bh(&idev->mc_report_lock); 858 } 859 860 static void ma_put(struct ifmcaddr6 *mc) 861 { 862 if (refcount_dec_and_test(&mc->mca_refcnt)) { 863 in6_dev_put(mc->idev); 864 kfree_rcu(mc, rcu); 865 } 866 } 867 868 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 869 const struct in6_addr *addr, 870 unsigned int mode) 871 { 872 struct ifmcaddr6 *mc; 873 874 mc_assert_locked(idev); 875 876 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 877 if (!mc) 878 return NULL; 879 880 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 881 882 mc->mca_addr = *addr; 883 mc->idev = idev; /* reference taken by caller */ 884 mc->mca_users = 1; 885 /* mca_stamp should be updated upon changes */ 886 mc->mca_cstamp = mc->mca_tstamp = jiffies; 887 refcount_set(&mc->mca_refcnt, 1); 888 889 mc->mca_sfmode = mode; 890 mc->mca_sfcount[mode] = 1; 891 892 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 893 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 894 mc->mca_flags |= MAF_NOREPORT; 895 896 return mc; 897 } 898 899 static void inet6_ifmcaddr_notify(struct net_device *dev, 900 const struct ifmcaddr6 *ifmca, int event) 901 { 902 struct inet6_fill_args fillargs = { 903 .portid = 0, 904 .seq = 0, 905 .event = event, 906 .flags = 0, 907 .netnsid = -1, 908 .force_rt_scope_universe = true, 909 }; 910 struct net *net = dev_net(dev); 911 struct sk_buff *skb; 912 int err = -ENOMEM; 913 914 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + 915 nla_total_size(sizeof(struct in6_addr)) + 916 nla_total_size(sizeof(struct ifa_cacheinfo)), 917 GFP_KERNEL); 918 if (!skb) 919 goto error; 920 921 err = inet6_fill_ifmcaddr(skb, ifmca, &fillargs); 922 if (err < 0) { 923 WARN_ON_ONCE(err == -EMSGSIZE); 924 nlmsg_free(skb); 925 goto error; 926 } 927 928 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MCADDR, NULL, GFP_KERNEL); 929 return; 930 error: 931 rtnl_set_sk_err(net, RTNLGRP_IPV6_MCADDR, err); 932 } 933 934 /* 935 * device multicast group inc (add if not found) 936 */ 937 static int __ipv6_dev_mc_inc(struct net_device *dev, 938 const struct in6_addr *addr, unsigned int mode) 939 { 940 struct inet6_dev *idev; 941 struct ifmcaddr6 *mc; 942 943 /* we need to take a reference on idev */ 944 idev = in6_dev_get(dev); 945 if (!idev) 946 return -EINVAL; 947 948 mutex_lock(&idev->mc_lock); 949 950 if (READ_ONCE(idev->dead)) { 951 mutex_unlock(&idev->mc_lock); 952 in6_dev_put(idev); 953 return -ENODEV; 954 } 955 956 for_each_mc_mclock(idev, mc) { 957 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 958 mc->mca_users++; 959 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 960 mutex_unlock(&idev->mc_lock); 961 in6_dev_put(idev); 962 return 0; 963 } 964 } 965 966 mc = mca_alloc(idev, addr, mode); 967 if (!mc) { 968 mutex_unlock(&idev->mc_lock); 969 in6_dev_put(idev); 970 return -ENOMEM; 971 } 972 973 rcu_assign_pointer(mc->next, idev->mc_list); 974 rcu_assign_pointer(idev->mc_list, mc); 975 976 mld_del_delrec(idev, mc); 977 igmp6_group_added(mc); 978 inet6_ifmcaddr_notify(dev, mc, RTM_NEWMULTICAST); 979 mutex_unlock(&idev->mc_lock); 980 981 return 0; 982 } 983 984 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 985 { 986 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 987 } 988 EXPORT_SYMBOL(ipv6_dev_mc_inc); 989 990 /* 991 * device multicast group del 992 */ 993 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 994 { 995 struct ifmcaddr6 *ma, __rcu **map; 996 997 mutex_lock(&idev->mc_lock); 998 999 for (map = &idev->mc_list; 1000 (ma = mc_dereference(*map, idev)); 1001 map = &ma->next) { 1002 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 1003 if (--ma->mca_users == 0) { 1004 *map = ma->next; 1005 1006 igmp6_group_dropped(ma); 1007 inet6_ifmcaddr_notify(idev->dev, ma, 1008 RTM_DELMULTICAST); 1009 ip6_mc_clear_src(ma); 1010 mutex_unlock(&idev->mc_lock); 1011 1012 ma_put(ma); 1013 return 0; 1014 } 1015 mutex_unlock(&idev->mc_lock); 1016 return 0; 1017 } 1018 } 1019 1020 mutex_unlock(&idev->mc_lock); 1021 return -ENOENT; 1022 } 1023 1024 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 1025 { 1026 struct inet6_dev *idev; 1027 int err; 1028 1029 idev = in6_dev_get(dev); 1030 if (!idev) 1031 return -ENODEV; 1032 1033 err = __ipv6_dev_mc_dec(idev, addr); 1034 in6_dev_put(idev); 1035 1036 return err; 1037 } 1038 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1039 1040 /* 1041 * check if the interface/address pair is valid 1042 */ 1043 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1044 const struct in6_addr *src_addr) 1045 { 1046 struct inet6_dev *idev; 1047 struct ifmcaddr6 *mc; 1048 bool rv = false; 1049 1050 rcu_read_lock(); 1051 idev = __in6_dev_get(dev); 1052 if (!idev) 1053 goto unlock; 1054 for_each_mc_rcu(idev, mc) { 1055 if (ipv6_addr_equal(&mc->mca_addr, group)) 1056 break; 1057 } 1058 if (!mc) 1059 goto unlock; 1060 if (src_addr && !ipv6_addr_any(src_addr)) { 1061 struct ip6_sf_list *psf; 1062 1063 for_each_psf_rcu(mc, psf) { 1064 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1065 break; 1066 } 1067 if (psf) 1068 rv = READ_ONCE(psf->sf_count[MCAST_INCLUDE]) || 1069 READ_ONCE(psf->sf_count[MCAST_EXCLUDE]) != 1070 READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]); 1071 else 1072 rv = READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]) != 0; 1073 } else { 1074 rv = true; /* don't filter unspecified source */ 1075 } 1076 unlock: 1077 rcu_read_unlock(); 1078 return rv; 1079 } 1080 1081 static void mld_gq_start_work(struct inet6_dev *idev) 1082 { 1083 unsigned long tv = get_random_u32_below(idev->mc_maxdelay); 1084 1085 mc_assert_locked(idev); 1086 1087 idev->mc_gq_running = 1; 1088 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1089 in6_dev_hold(idev); 1090 } 1091 1092 static void mld_gq_stop_work(struct inet6_dev *idev) 1093 { 1094 mc_assert_locked(idev); 1095 1096 idev->mc_gq_running = 0; 1097 if (cancel_delayed_work(&idev->mc_gq_work)) 1098 __in6_dev_put(idev); 1099 } 1100 1101 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1102 { 1103 unsigned long tv = get_random_u32_below(delay); 1104 1105 mc_assert_locked(idev); 1106 1107 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1108 in6_dev_hold(idev); 1109 } 1110 1111 static void mld_ifc_stop_work(struct inet6_dev *idev) 1112 { 1113 mc_assert_locked(idev); 1114 1115 idev->mc_ifc_count = 0; 1116 if (cancel_delayed_work(&idev->mc_ifc_work)) 1117 __in6_dev_put(idev); 1118 } 1119 1120 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1121 { 1122 unsigned long tv = get_random_u32_below(delay); 1123 1124 mc_assert_locked(idev); 1125 1126 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1127 in6_dev_hold(idev); 1128 } 1129 1130 static void mld_dad_stop_work(struct inet6_dev *idev) 1131 { 1132 if (cancel_delayed_work(&idev->mc_dad_work)) 1133 __in6_dev_put(idev); 1134 } 1135 1136 static void mld_query_stop_work(struct inet6_dev *idev) 1137 { 1138 spin_lock_bh(&idev->mc_query_lock); 1139 if (cancel_delayed_work(&idev->mc_query_work)) 1140 __in6_dev_put(idev); 1141 spin_unlock_bh(&idev->mc_query_lock); 1142 } 1143 1144 static void mld_report_stop_work(struct inet6_dev *idev) 1145 { 1146 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1147 __in6_dev_put(idev); 1148 } 1149 1150 /* IGMP handling (alias multicast ICMPv6 messages) */ 1151 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1152 { 1153 unsigned long delay = resptime; 1154 1155 mc_assert_locked(ma->idev); 1156 1157 /* Do not start work for these addresses */ 1158 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1159 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1160 return; 1161 1162 if (cancel_delayed_work(&ma->mca_work)) { 1163 refcount_dec(&ma->mca_refcnt); 1164 delay = ma->mca_work.timer.expires - jiffies; 1165 } 1166 1167 if (delay >= resptime) 1168 delay = get_random_u32_below(resptime); 1169 1170 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1171 refcount_inc(&ma->mca_refcnt); 1172 ma->mca_flags |= MAF_TIMER_RUNNING; 1173 } 1174 1175 /* mark EXCLUDE-mode sources */ 1176 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1177 const struct in6_addr *srcs) 1178 { 1179 struct ip6_sf_list *psf; 1180 int i, scount; 1181 1182 mc_assert_locked(pmc->idev); 1183 1184 scount = 0; 1185 for_each_psf_mclock(pmc, psf) { 1186 if (scount == nsrcs) 1187 break; 1188 for (i = 0; i < nsrcs; i++) { 1189 /* skip inactive filters */ 1190 if (psf->sf_count[MCAST_INCLUDE] || 1191 pmc->mca_sfcount[MCAST_EXCLUDE] != 1192 psf->sf_count[MCAST_EXCLUDE]) 1193 break; 1194 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1195 scount++; 1196 break; 1197 } 1198 } 1199 } 1200 pmc->mca_flags &= ~MAF_GSQUERY; 1201 if (scount == nsrcs) /* all sources excluded */ 1202 return false; 1203 return true; 1204 } 1205 1206 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1207 const struct in6_addr *srcs) 1208 { 1209 struct ip6_sf_list *psf; 1210 int i, scount; 1211 1212 mc_assert_locked(pmc->idev); 1213 1214 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1215 return mld_xmarksources(pmc, nsrcs, srcs); 1216 1217 /* mark INCLUDE-mode sources */ 1218 1219 scount = 0; 1220 for_each_psf_mclock(pmc, psf) { 1221 if (scount == nsrcs) 1222 break; 1223 for (i = 0; i < nsrcs; i++) { 1224 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1225 psf->sf_gsresp = 1; 1226 scount++; 1227 break; 1228 } 1229 } 1230 } 1231 if (!scount) { 1232 pmc->mca_flags &= ~MAF_GSQUERY; 1233 return false; 1234 } 1235 pmc->mca_flags |= MAF_GSQUERY; 1236 return true; 1237 } 1238 1239 static int mld_force_mld_version(const struct inet6_dev *idev) 1240 { 1241 const struct net *net = dev_net(idev->dev); 1242 int all_force; 1243 1244 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1245 /* Normally, both are 0 here. If enforcement to a particular is 1246 * being used, individual device enforcement will have a lower 1247 * precedence over 'all' device (.../conf/all/force_mld_version). 1248 */ 1249 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1250 } 1251 1252 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1253 { 1254 return mld_force_mld_version(idev) == 2; 1255 } 1256 1257 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1258 { 1259 return mld_force_mld_version(idev) == 1; 1260 } 1261 1262 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1263 { 1264 if (mld_in_v2_mode_only(idev)) 1265 return false; 1266 if (mld_in_v1_mode_only(idev)) 1267 return true; 1268 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1269 return true; 1270 1271 return false; 1272 } 1273 1274 static void mld_set_v1_mode(struct inet6_dev *idev) 1275 { 1276 /* RFC3810, relevant sections: 1277 * - 9.1. Robustness Variable 1278 * - 9.2. Query Interval 1279 * - 9.3. Query Response Interval 1280 * - 9.12. Older Version Querier Present Timeout 1281 */ 1282 unsigned long switchback; 1283 1284 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1285 1286 idev->mc_v1_seen = jiffies + switchback; 1287 } 1288 1289 static void mld_update_qrv(struct inet6_dev *idev, 1290 const struct mld2_query *mlh2) 1291 { 1292 /* RFC3810, relevant sections: 1293 * - 5.1.8. QRV (Querier's Robustness Variable) 1294 * - 9.1. Robustness Variable 1295 */ 1296 1297 /* The value of the Robustness Variable MUST NOT be zero, 1298 * and SHOULD NOT be one. Catch this here if we ever run 1299 * into such a case in future. 1300 */ 1301 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1302 WARN_ON(idev->mc_qrv == 0); 1303 1304 if (mlh2->mld2q_qrv > 0) 1305 idev->mc_qrv = mlh2->mld2q_qrv; 1306 1307 if (unlikely(idev->mc_qrv < min_qrv)) { 1308 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1309 idev->mc_qrv, min_qrv); 1310 idev->mc_qrv = min_qrv; 1311 } 1312 } 1313 1314 static void mld_update_qi(struct inet6_dev *idev, 1315 const struct mld2_query *mlh2) 1316 { 1317 /* RFC3810, relevant sections: 1318 * - 5.1.9. QQIC (Querier's Query Interval Code) 1319 * - 9.2. Query Interval 1320 * - 9.12. Older Version Querier Present Timeout 1321 * (the [Query Interval] in the last Query received) 1322 */ 1323 unsigned long mc_qqi; 1324 1325 if (mlh2->mld2q_qqic < 128) { 1326 mc_qqi = mlh2->mld2q_qqic; 1327 } else { 1328 unsigned long mc_man, mc_exp; 1329 1330 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1331 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1332 1333 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1334 } 1335 1336 idev->mc_qi = mc_qqi * HZ; 1337 } 1338 1339 static void mld_update_qri(struct inet6_dev *idev, 1340 const struct mld2_query *mlh2) 1341 { 1342 /* RFC3810, relevant sections: 1343 * - 5.1.3. Maximum Response Code 1344 * - 9.3. Query Response Interval 1345 */ 1346 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1347 } 1348 1349 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1350 unsigned long *max_delay, bool v1_query) 1351 { 1352 unsigned long mldv1_md; 1353 1354 /* Ignore v1 queries */ 1355 if (mld_in_v2_mode_only(idev)) 1356 return -EINVAL; 1357 1358 mldv1_md = ntohs(mld->mld_maxdelay); 1359 1360 /* When in MLDv1 fallback and a MLDv2 router start-up being 1361 * unaware of current MLDv1 operation, the MRC == MRD mapping 1362 * only works when the exponential algorithm is not being 1363 * used (as MLDv1 is unaware of such things). 1364 * 1365 * According to the RFC author, the MLDv2 implementations 1366 * he's aware of all use a MRC < 32768 on start up queries. 1367 * 1368 * Thus, should we *ever* encounter something else larger 1369 * than that, just assume the maximum possible within our 1370 * reach. 1371 */ 1372 if (!v1_query) 1373 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1374 1375 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1376 1377 /* MLDv1 router present: we need to go into v1 mode *only* 1378 * when an MLDv1 query is received as per section 9.12. of 1379 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1380 * queries MUST be of exactly 24 octets. 1381 */ 1382 if (v1_query) 1383 mld_set_v1_mode(idev); 1384 1385 /* cancel MLDv2 report work */ 1386 mld_gq_stop_work(idev); 1387 /* cancel the interface change work */ 1388 mld_ifc_stop_work(idev); 1389 /* clear deleted report items */ 1390 mld_clear_delrec(idev); 1391 1392 return 0; 1393 } 1394 1395 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1396 unsigned long *max_delay) 1397 { 1398 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1399 1400 mld_update_qrv(idev, mld); 1401 mld_update_qi(idev, mld); 1402 mld_update_qri(idev, mld); 1403 1404 idev->mc_maxdelay = *max_delay; 1405 1406 return; 1407 } 1408 1409 /* called with rcu_read_lock() */ 1410 void igmp6_event_query(struct sk_buff *skb) 1411 { 1412 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1413 1414 if (!idev || idev->dead) 1415 goto out; 1416 1417 spin_lock_bh(&idev->mc_query_lock); 1418 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1419 __skb_queue_tail(&idev->mc_query_queue, skb); 1420 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1421 in6_dev_hold(idev); 1422 skb = NULL; 1423 } 1424 spin_unlock_bh(&idev->mc_query_lock); 1425 out: 1426 kfree_skb(skb); 1427 } 1428 1429 static void __mld_query_work(struct sk_buff *skb) 1430 { 1431 struct mld2_query *mlh2 = NULL; 1432 const struct in6_addr *group; 1433 unsigned long max_delay; 1434 struct inet6_dev *idev; 1435 struct ifmcaddr6 *ma; 1436 struct mld_msg *mld; 1437 int group_type; 1438 int mark = 0; 1439 int len, err; 1440 1441 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1442 goto kfree_skb; 1443 1444 /* compute payload length excluding extension headers */ 1445 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1446 len -= skb_network_header_len(skb); 1447 1448 /* RFC3810 6.2 1449 * Upon reception of an MLD message that contains a Query, the node 1450 * checks if the source address of the message is a valid link-local 1451 * address, if the Hop Limit is set to 1, and if the Router Alert 1452 * option is present in the Hop-By-Hop Options header of the IPv6 1453 * packet. If any of these checks fails, the packet is dropped. 1454 */ 1455 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1456 ipv6_hdr(skb)->hop_limit != 1 || 1457 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1458 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1459 goto kfree_skb; 1460 1461 idev = in6_dev_get(skb->dev); 1462 if (!idev) 1463 goto kfree_skb; 1464 1465 mld = (struct mld_msg *)icmp6_hdr(skb); 1466 group = &mld->mld_mca; 1467 group_type = ipv6_addr_type(group); 1468 1469 if (group_type != IPV6_ADDR_ANY && 1470 !(group_type&IPV6_ADDR_MULTICAST)) 1471 goto out; 1472 1473 if (len < MLD_V1_QUERY_LEN) { 1474 goto out; 1475 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1476 err = mld_process_v1(idev, mld, &max_delay, 1477 len == MLD_V1_QUERY_LEN); 1478 if (err < 0) 1479 goto out; 1480 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1481 int srcs_offset = sizeof(struct mld2_query) - 1482 sizeof(struct icmp6hdr); 1483 1484 if (!pskb_may_pull(skb, srcs_offset)) 1485 goto out; 1486 1487 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1488 1489 mld_process_v2(idev, mlh2, &max_delay); 1490 1491 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1492 if (mlh2->mld2q_nsrcs) 1493 goto out; /* no sources allowed */ 1494 1495 mld_gq_start_work(idev); 1496 goto out; 1497 } 1498 /* mark sources to include, if group & source-specific */ 1499 if (mlh2->mld2q_nsrcs != 0) { 1500 if (!pskb_may_pull(skb, srcs_offset + 1501 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1502 goto out; 1503 1504 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1505 mark = 1; 1506 } 1507 } else { 1508 goto out; 1509 } 1510 1511 if (group_type == IPV6_ADDR_ANY) { 1512 for_each_mc_mclock(idev, ma) { 1513 igmp6_group_queried(ma, max_delay); 1514 } 1515 } else { 1516 for_each_mc_mclock(idev, ma) { 1517 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1518 continue; 1519 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1520 /* gsquery <- gsquery && mark */ 1521 if (!mark) 1522 ma->mca_flags &= ~MAF_GSQUERY; 1523 } else { 1524 /* gsquery <- mark */ 1525 if (mark) 1526 ma->mca_flags |= MAF_GSQUERY; 1527 else 1528 ma->mca_flags &= ~MAF_GSQUERY; 1529 } 1530 if (!(ma->mca_flags & MAF_GSQUERY) || 1531 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1532 igmp6_group_queried(ma, max_delay); 1533 break; 1534 } 1535 } 1536 1537 out: 1538 in6_dev_put(idev); 1539 kfree_skb: 1540 consume_skb(skb); 1541 } 1542 1543 static void mld_query_work(struct work_struct *work) 1544 { 1545 struct inet6_dev *idev = container_of(to_delayed_work(work), 1546 struct inet6_dev, 1547 mc_query_work); 1548 struct sk_buff_head q; 1549 struct sk_buff *skb; 1550 bool rework = false; 1551 int cnt = 0; 1552 1553 skb_queue_head_init(&q); 1554 1555 spin_lock_bh(&idev->mc_query_lock); 1556 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1557 __skb_queue_tail(&q, skb); 1558 1559 if (++cnt >= MLD_MAX_QUEUE) { 1560 rework = true; 1561 break; 1562 } 1563 } 1564 spin_unlock_bh(&idev->mc_query_lock); 1565 1566 mutex_lock(&idev->mc_lock); 1567 while ((skb = __skb_dequeue(&q))) 1568 __mld_query_work(skb); 1569 mutex_unlock(&idev->mc_lock); 1570 1571 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1572 return; 1573 1574 in6_dev_put(idev); 1575 } 1576 1577 /* called with rcu_read_lock() */ 1578 void igmp6_event_report(struct sk_buff *skb) 1579 { 1580 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1581 1582 if (!idev || idev->dead) 1583 goto out; 1584 1585 spin_lock_bh(&idev->mc_report_lock); 1586 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1587 __skb_queue_tail(&idev->mc_report_queue, skb); 1588 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1589 in6_dev_hold(idev); 1590 skb = NULL; 1591 } 1592 spin_unlock_bh(&idev->mc_report_lock); 1593 out: 1594 kfree_skb(skb); 1595 } 1596 1597 static void __mld_report_work(struct sk_buff *skb) 1598 { 1599 struct inet6_dev *idev; 1600 struct ifmcaddr6 *ma; 1601 struct mld_msg *mld; 1602 int addr_type; 1603 1604 /* Our own report looped back. Ignore it. */ 1605 if (skb->pkt_type == PACKET_LOOPBACK) 1606 goto kfree_skb; 1607 1608 /* send our report if the MC router may not have heard this report */ 1609 if (skb->pkt_type != PACKET_MULTICAST && 1610 skb->pkt_type != PACKET_BROADCAST) 1611 goto kfree_skb; 1612 1613 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1614 goto kfree_skb; 1615 1616 mld = (struct mld_msg *)icmp6_hdr(skb); 1617 1618 /* Drop reports with not link local source */ 1619 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1620 if (addr_type != IPV6_ADDR_ANY && 1621 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1622 goto kfree_skb; 1623 1624 idev = in6_dev_get(skb->dev); 1625 if (!idev) 1626 goto kfree_skb; 1627 1628 /* 1629 * Cancel the work for this group 1630 */ 1631 1632 for_each_mc_mclock(idev, ma) { 1633 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1634 if (cancel_delayed_work(&ma->mca_work)) 1635 refcount_dec(&ma->mca_refcnt); 1636 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1637 MAF_TIMER_RUNNING); 1638 break; 1639 } 1640 } 1641 1642 in6_dev_put(idev); 1643 kfree_skb: 1644 consume_skb(skb); 1645 } 1646 1647 static void mld_report_work(struct work_struct *work) 1648 { 1649 struct inet6_dev *idev = container_of(to_delayed_work(work), 1650 struct inet6_dev, 1651 mc_report_work); 1652 struct sk_buff_head q; 1653 struct sk_buff *skb; 1654 bool rework = false; 1655 int cnt = 0; 1656 1657 skb_queue_head_init(&q); 1658 spin_lock_bh(&idev->mc_report_lock); 1659 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1660 __skb_queue_tail(&q, skb); 1661 1662 if (++cnt >= MLD_MAX_QUEUE) { 1663 rework = true; 1664 break; 1665 } 1666 } 1667 spin_unlock_bh(&idev->mc_report_lock); 1668 1669 mutex_lock(&idev->mc_lock); 1670 while ((skb = __skb_dequeue(&q))) 1671 __mld_report_work(skb); 1672 mutex_unlock(&idev->mc_lock); 1673 1674 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1675 return; 1676 1677 in6_dev_put(idev); 1678 } 1679 1680 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1681 int gdeleted, int sdeleted) 1682 { 1683 switch (type) { 1684 case MLD2_MODE_IS_INCLUDE: 1685 case MLD2_MODE_IS_EXCLUDE: 1686 if (gdeleted || sdeleted) 1687 return false; 1688 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1689 if (pmc->mca_sfmode == MCAST_INCLUDE) 1690 return true; 1691 /* don't include if this source is excluded 1692 * in all filters 1693 */ 1694 if (psf->sf_count[MCAST_INCLUDE]) 1695 return type == MLD2_MODE_IS_INCLUDE; 1696 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1697 psf->sf_count[MCAST_EXCLUDE]; 1698 } 1699 return false; 1700 case MLD2_CHANGE_TO_INCLUDE: 1701 if (gdeleted || sdeleted) 1702 return false; 1703 return psf->sf_count[MCAST_INCLUDE] != 0; 1704 case MLD2_CHANGE_TO_EXCLUDE: 1705 if (gdeleted || sdeleted) 1706 return false; 1707 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1708 psf->sf_count[MCAST_INCLUDE]) 1709 return false; 1710 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1711 psf->sf_count[MCAST_EXCLUDE]; 1712 case MLD2_ALLOW_NEW_SOURCES: 1713 if (gdeleted || !psf->sf_crcount) 1714 return false; 1715 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1716 case MLD2_BLOCK_OLD_SOURCES: 1717 if (pmc->mca_sfmode == MCAST_INCLUDE) 1718 return gdeleted || (psf->sf_crcount && sdeleted); 1719 return psf->sf_crcount && !gdeleted && !sdeleted; 1720 } 1721 return false; 1722 } 1723 1724 static int 1725 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1726 { 1727 struct ip6_sf_list *psf; 1728 int scount = 0; 1729 1730 for_each_psf_mclock(pmc, psf) { 1731 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1732 continue; 1733 scount++; 1734 } 1735 return scount; 1736 } 1737 1738 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1739 struct net_device *dev, const struct in6_addr *saddr, 1740 const struct in6_addr *daddr, int proto, int len) 1741 { 1742 struct ipv6hdr *hdr; 1743 1744 skb->protocol = htons(ETH_P_IPV6); 1745 skb->dev = dev; 1746 1747 skb_reset_network_header(skb); 1748 skb_put(skb, sizeof(struct ipv6hdr)); 1749 hdr = ipv6_hdr(skb); 1750 1751 ip6_flow_hdr(hdr, 0, 0); 1752 1753 hdr->payload_len = htons(len); 1754 hdr->nexthdr = proto; 1755 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1756 1757 hdr->saddr = *saddr; 1758 hdr->daddr = *daddr; 1759 } 1760 1761 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1762 { 1763 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1764 2, 0, 0, IPV6_TLV_PADN, 0 }; 1765 struct net_device *dev = idev->dev; 1766 int hlen = LL_RESERVED_SPACE(dev); 1767 int tlen = dev->needed_tailroom; 1768 const struct in6_addr *saddr; 1769 struct in6_addr addr_buf; 1770 struct mld2_report *pmr; 1771 struct sk_buff *skb; 1772 unsigned int size; 1773 struct sock *sk; 1774 struct net *net; 1775 1776 /* we assume size > sizeof(ra) here 1777 * Also try to not allocate high-order pages for big MTU 1778 */ 1779 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1780 skb = alloc_skb(size, GFP_KERNEL); 1781 if (!skb) 1782 return NULL; 1783 1784 skb->priority = TC_PRIO_CONTROL; 1785 skb_reserve(skb, hlen); 1786 skb_tailroom_reserve(skb, mtu, tlen); 1787 1788 rcu_read_lock(); 1789 1790 net = dev_net_rcu(dev); 1791 sk = net->ipv6.igmp_sk; 1792 skb_set_owner_w(skb, sk); 1793 1794 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1795 /* <draft-ietf-magma-mld-source-05.txt>: 1796 * use unspecified address as the source address 1797 * when a valid link-local address is not available. 1798 */ 1799 saddr = &in6addr_any; 1800 } else 1801 saddr = &addr_buf; 1802 1803 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1804 1805 rcu_read_unlock(); 1806 1807 skb_put_data(skb, ra, sizeof(ra)); 1808 1809 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1810 skb_put(skb, sizeof(*pmr)); 1811 pmr = (struct mld2_report *)skb_transport_header(skb); 1812 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1813 pmr->mld2r_resv1 = 0; 1814 pmr->mld2r_cksum = 0; 1815 pmr->mld2r_resv2 = 0; 1816 pmr->mld2r_ngrec = 0; 1817 return skb; 1818 } 1819 1820 static void mld_sendpack(struct sk_buff *skb) 1821 { 1822 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1823 struct mld2_report *pmr = 1824 (struct mld2_report *)skb_transport_header(skb); 1825 int payload_len, mldlen; 1826 struct inet6_dev *idev; 1827 struct net *net = dev_net(skb->dev); 1828 int err; 1829 struct flowi6 fl6; 1830 struct dst_entry *dst; 1831 1832 rcu_read_lock(); 1833 idev = __in6_dev_get(skb->dev); 1834 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1835 1836 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1837 sizeof(*pip6); 1838 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1839 pip6->payload_len = htons(payload_len); 1840 1841 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1842 IPPROTO_ICMPV6, 1843 csum_partial(skb_transport_header(skb), 1844 mldlen, 0)); 1845 1846 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1847 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1848 skb->dev->ifindex); 1849 dst = icmp6_dst_alloc(skb->dev, &fl6); 1850 1851 err = 0; 1852 if (IS_ERR(dst)) { 1853 err = PTR_ERR(dst); 1854 dst = NULL; 1855 } 1856 skb_dst_set(skb, dst); 1857 if (err) 1858 goto err_out; 1859 1860 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1861 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1862 dst_output); 1863 out: 1864 if (!err) { 1865 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1866 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1867 } else { 1868 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1869 } 1870 1871 rcu_read_unlock(); 1872 return; 1873 1874 err_out: 1875 kfree_skb(skb); 1876 goto out; 1877 } 1878 1879 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1880 { 1881 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1882 } 1883 1884 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1885 int type, struct mld2_grec **ppgr, unsigned int mtu) 1886 { 1887 struct mld2_report *pmr; 1888 struct mld2_grec *pgr; 1889 1890 if (!skb) { 1891 skb = mld_newpack(pmc->idev, mtu); 1892 if (!skb) 1893 return NULL; 1894 } 1895 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1896 pgr->grec_type = type; 1897 pgr->grec_auxwords = 0; 1898 pgr->grec_nsrcs = 0; 1899 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1900 pmr = (struct mld2_report *)skb_transport_header(skb); 1901 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1902 *ppgr = pgr; 1903 return skb; 1904 } 1905 1906 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1907 1908 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1909 int type, int gdeleted, int sdeleted, 1910 int crsend) 1911 { 1912 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1913 int scount, stotal, first, isquery, truncate; 1914 struct ip6_sf_list __rcu **psf_list; 1915 struct inet6_dev *idev = pmc->idev; 1916 struct net_device *dev = idev->dev; 1917 struct mld2_grec *pgr = NULL; 1918 struct mld2_report *pmr; 1919 unsigned int mtu; 1920 1921 mc_assert_locked(idev); 1922 1923 if (pmc->mca_flags & MAF_NOREPORT) 1924 return skb; 1925 1926 mtu = READ_ONCE(dev->mtu); 1927 if (mtu < IPV6_MIN_MTU) 1928 return skb; 1929 1930 isquery = type == MLD2_MODE_IS_INCLUDE || 1931 type == MLD2_MODE_IS_EXCLUDE; 1932 truncate = type == MLD2_MODE_IS_EXCLUDE || 1933 type == MLD2_CHANGE_TO_EXCLUDE; 1934 1935 stotal = scount = 0; 1936 1937 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1938 1939 if (!rcu_access_pointer(*psf_list)) 1940 goto empty_source; 1941 1942 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1943 1944 /* EX and TO_EX get a fresh packet, if needed */ 1945 if (truncate) { 1946 if (pmr && pmr->mld2r_ngrec && 1947 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1948 if (skb) 1949 mld_sendpack(skb); 1950 skb = mld_newpack(idev, mtu); 1951 } 1952 } 1953 first = 1; 1954 psf_prev = NULL; 1955 for (psf = mc_dereference(*psf_list, idev); 1956 psf; 1957 psf = psf_next) { 1958 struct in6_addr *psrc; 1959 1960 psf_next = mc_dereference(psf->sf_next, idev); 1961 1962 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1963 psf_prev = psf; 1964 continue; 1965 } 1966 1967 /* Based on RFC3810 6.1. Should not send source-list change 1968 * records when there is a filter mode change. 1969 */ 1970 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1971 (!gdeleted && pmc->mca_crcount)) && 1972 (type == MLD2_ALLOW_NEW_SOURCES || 1973 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1974 goto decrease_sf_crcount; 1975 1976 /* clear marks on query responses */ 1977 if (isquery) 1978 psf->sf_gsresp = 0; 1979 1980 if (AVAILABLE(skb) < sizeof(*psrc) + 1981 first*sizeof(struct mld2_grec)) { 1982 if (truncate && !first) 1983 break; /* truncate these */ 1984 if (pgr) 1985 pgr->grec_nsrcs = htons(scount); 1986 if (skb) 1987 mld_sendpack(skb); 1988 skb = mld_newpack(idev, mtu); 1989 first = 1; 1990 scount = 0; 1991 } 1992 if (first) { 1993 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1994 first = 0; 1995 } 1996 if (!skb) 1997 return NULL; 1998 psrc = skb_put(skb, sizeof(*psrc)); 1999 *psrc = psf->sf_addr; 2000 scount++; stotal++; 2001 if ((type == MLD2_ALLOW_NEW_SOURCES || 2002 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 2003 decrease_sf_crcount: 2004 psf->sf_crcount--; 2005 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 2006 if (psf_prev) 2007 rcu_assign_pointer(psf_prev->sf_next, 2008 mc_dereference(psf->sf_next, idev)); 2009 else 2010 rcu_assign_pointer(*psf_list, 2011 mc_dereference(psf->sf_next, idev)); 2012 kfree_rcu(psf, rcu); 2013 continue; 2014 } 2015 } 2016 psf_prev = psf; 2017 } 2018 2019 empty_source: 2020 if (!stotal) { 2021 if (type == MLD2_ALLOW_NEW_SOURCES || 2022 type == MLD2_BLOCK_OLD_SOURCES) 2023 return skb; 2024 if (pmc->mca_crcount || isquery || crsend) { 2025 /* make sure we have room for group header */ 2026 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 2027 mld_sendpack(skb); 2028 skb = NULL; /* add_grhead will get a new one */ 2029 } 2030 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2031 } 2032 } 2033 if (pgr) 2034 pgr->grec_nsrcs = htons(scount); 2035 2036 if (isquery) 2037 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 2038 return skb; 2039 } 2040 2041 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2042 { 2043 struct sk_buff *skb = NULL; 2044 int type; 2045 2046 mc_assert_locked(idev); 2047 2048 if (!pmc) { 2049 for_each_mc_mclock(idev, pmc) { 2050 if (pmc->mca_flags & MAF_NOREPORT) 2051 continue; 2052 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2053 type = MLD2_MODE_IS_EXCLUDE; 2054 else 2055 type = MLD2_MODE_IS_INCLUDE; 2056 skb = add_grec(skb, pmc, type, 0, 0, 0); 2057 } 2058 } else { 2059 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2060 type = MLD2_MODE_IS_EXCLUDE; 2061 else 2062 type = MLD2_MODE_IS_INCLUDE; 2063 skb = add_grec(skb, pmc, type, 0, 0, 0); 2064 } 2065 if (skb) 2066 mld_sendpack(skb); 2067 } 2068 2069 /* remove zero-count source records from a source filter list */ 2070 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2071 { 2072 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2073 2074 psf_prev = NULL; 2075 for (psf = mc_dereference(*ppsf, idev); 2076 psf; 2077 psf = psf_next) { 2078 psf_next = mc_dereference(psf->sf_next, idev); 2079 if (psf->sf_crcount == 0) { 2080 if (psf_prev) 2081 rcu_assign_pointer(psf_prev->sf_next, 2082 mc_dereference(psf->sf_next, idev)); 2083 else 2084 rcu_assign_pointer(*ppsf, 2085 mc_dereference(psf->sf_next, idev)); 2086 kfree_rcu(psf, rcu); 2087 } else { 2088 psf_prev = psf; 2089 } 2090 } 2091 } 2092 2093 static void mld_send_cr(struct inet6_dev *idev) 2094 { 2095 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2096 struct sk_buff *skb = NULL; 2097 int type, dtype; 2098 2099 /* deleted MCA's */ 2100 pmc_prev = NULL; 2101 for (pmc = mc_dereference(idev->mc_tomb, idev); 2102 pmc; 2103 pmc = pmc_next) { 2104 pmc_next = mc_dereference(pmc->next, idev); 2105 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2106 type = MLD2_BLOCK_OLD_SOURCES; 2107 dtype = MLD2_BLOCK_OLD_SOURCES; 2108 skb = add_grec(skb, pmc, type, 1, 0, 0); 2109 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2110 } 2111 if (pmc->mca_crcount) { 2112 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2113 type = MLD2_CHANGE_TO_INCLUDE; 2114 skb = add_grec(skb, pmc, type, 1, 0, 0); 2115 } 2116 pmc->mca_crcount--; 2117 if (pmc->mca_crcount == 0) { 2118 mld_clear_zeros(&pmc->mca_tomb, idev); 2119 mld_clear_zeros(&pmc->mca_sources, idev); 2120 } 2121 } 2122 if (pmc->mca_crcount == 0 && 2123 !rcu_access_pointer(pmc->mca_tomb) && 2124 !rcu_access_pointer(pmc->mca_sources)) { 2125 if (pmc_prev) 2126 rcu_assign_pointer(pmc_prev->next, pmc_next); 2127 else 2128 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2129 in6_dev_put(pmc->idev); 2130 kfree_rcu(pmc, rcu); 2131 } else 2132 pmc_prev = pmc; 2133 } 2134 2135 /* change recs */ 2136 for_each_mc_mclock(idev, pmc) { 2137 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2138 type = MLD2_BLOCK_OLD_SOURCES; 2139 dtype = MLD2_ALLOW_NEW_SOURCES; 2140 } else { 2141 type = MLD2_ALLOW_NEW_SOURCES; 2142 dtype = MLD2_BLOCK_OLD_SOURCES; 2143 } 2144 skb = add_grec(skb, pmc, type, 0, 0, 0); 2145 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2146 2147 /* filter mode changes */ 2148 if (pmc->mca_crcount) { 2149 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2150 type = MLD2_CHANGE_TO_EXCLUDE; 2151 else 2152 type = MLD2_CHANGE_TO_INCLUDE; 2153 skb = add_grec(skb, pmc, type, 0, 0, 0); 2154 pmc->mca_crcount--; 2155 } 2156 } 2157 if (!skb) 2158 return; 2159 (void) mld_sendpack(skb); 2160 } 2161 2162 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2163 { 2164 const struct in6_addr *snd_addr, *saddr; 2165 int err, len, payload_len, full_len; 2166 struct in6_addr addr_buf; 2167 struct inet6_dev *idev; 2168 struct sk_buff *skb; 2169 struct mld_msg *hdr; 2170 int hlen = LL_RESERVED_SPACE(dev); 2171 int tlen = dev->needed_tailroom; 2172 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2173 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2174 IPV6_TLV_PADN, 0 }; 2175 struct dst_entry *dst; 2176 struct flowi6 fl6; 2177 struct net *net; 2178 struct sock *sk; 2179 2180 if (type == ICMPV6_MGM_REDUCTION) 2181 snd_addr = &in6addr_linklocal_allrouters; 2182 else 2183 snd_addr = addr; 2184 2185 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2186 payload_len = len + sizeof(ra); 2187 full_len = sizeof(struct ipv6hdr) + payload_len; 2188 2189 skb = alloc_skb(hlen + tlen + full_len, GFP_KERNEL); 2190 2191 rcu_read_lock(); 2192 2193 net = dev_net_rcu(dev); 2194 idev = __in6_dev_get(dev); 2195 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 2196 if (!skb) { 2197 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2198 rcu_read_unlock(); 2199 return; 2200 } 2201 sk = net->ipv6.igmp_sk; 2202 skb_set_owner_w(skb, sk); 2203 2204 skb->priority = TC_PRIO_CONTROL; 2205 skb_reserve(skb, hlen); 2206 2207 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2208 /* <draft-ietf-magma-mld-source-05.txt>: 2209 * use unspecified address as the source address 2210 * when a valid link-local address is not available. 2211 */ 2212 saddr = &in6addr_any; 2213 } else 2214 saddr = &addr_buf; 2215 2216 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2217 2218 skb_put_data(skb, ra, sizeof(ra)); 2219 2220 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2221 hdr->mld_type = type; 2222 hdr->mld_mca = *addr; 2223 2224 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2225 IPPROTO_ICMPV6, 2226 csum_partial(hdr, len, 0)); 2227 2228 icmpv6_flow_init(sk, &fl6, type, 2229 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2230 skb->dev->ifindex); 2231 dst = icmp6_dst_alloc(skb->dev, &fl6); 2232 if (IS_ERR(dst)) { 2233 err = PTR_ERR(dst); 2234 goto err_out; 2235 } 2236 2237 skb_dst_set(skb, dst); 2238 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2239 net, sk, skb, NULL, skb->dev, 2240 dst_output); 2241 out: 2242 if (!err) { 2243 ICMP6MSGOUT_INC_STATS(net, idev, type); 2244 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2245 } else 2246 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2247 2248 rcu_read_unlock(); 2249 return; 2250 2251 err_out: 2252 kfree_skb(skb); 2253 goto out; 2254 } 2255 2256 static void mld_send_initial_cr(struct inet6_dev *idev) 2257 { 2258 struct ifmcaddr6 *pmc; 2259 struct sk_buff *skb; 2260 int type; 2261 2262 mc_assert_locked(idev); 2263 2264 if (mld_in_v1_mode(idev)) 2265 return; 2266 2267 skb = NULL; 2268 for_each_mc_mclock(idev, pmc) { 2269 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2270 type = MLD2_CHANGE_TO_EXCLUDE; 2271 else 2272 type = MLD2_ALLOW_NEW_SOURCES; 2273 skb = add_grec(skb, pmc, type, 0, 0, 1); 2274 } 2275 if (skb) 2276 mld_sendpack(skb); 2277 } 2278 2279 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2280 { 2281 mutex_lock(&idev->mc_lock); 2282 idev->mc_dad_count = idev->mc_qrv; 2283 if (idev->mc_dad_count) { 2284 mld_send_initial_cr(idev); 2285 idev->mc_dad_count--; 2286 if (idev->mc_dad_count) 2287 mld_dad_start_work(idev, 2288 unsolicited_report_interval(idev)); 2289 } 2290 mutex_unlock(&idev->mc_lock); 2291 } 2292 2293 static void mld_dad_work(struct work_struct *work) 2294 { 2295 struct inet6_dev *idev = container_of(to_delayed_work(work), 2296 struct inet6_dev, 2297 mc_dad_work); 2298 mutex_lock(&idev->mc_lock); 2299 mld_send_initial_cr(idev); 2300 if (idev->mc_dad_count) { 2301 idev->mc_dad_count--; 2302 if (idev->mc_dad_count) 2303 mld_dad_start_work(idev, 2304 unsolicited_report_interval(idev)); 2305 } 2306 mutex_unlock(&idev->mc_lock); 2307 in6_dev_put(idev); 2308 } 2309 2310 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2311 const struct in6_addr *psfsrc) 2312 { 2313 struct ip6_sf_list *psf, *psf_prev; 2314 int rv = 0; 2315 2316 mc_assert_locked(pmc->idev); 2317 2318 psf_prev = NULL; 2319 for_each_psf_mclock(pmc, psf) { 2320 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2321 break; 2322 psf_prev = psf; 2323 } 2324 if (!psf || psf->sf_count[sfmode] == 0) { 2325 /* source filter not found, or count wrong => bug */ 2326 return -ESRCH; 2327 } 2328 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1); 2329 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2330 struct inet6_dev *idev = pmc->idev; 2331 2332 /* no more filters for this source */ 2333 if (psf_prev) 2334 rcu_assign_pointer(psf_prev->sf_next, 2335 mc_dereference(psf->sf_next, idev)); 2336 else 2337 rcu_assign_pointer(pmc->mca_sources, 2338 mc_dereference(psf->sf_next, idev)); 2339 2340 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2341 !mld_in_v1_mode(idev)) { 2342 psf->sf_crcount = idev->mc_qrv; 2343 rcu_assign_pointer(psf->sf_next, 2344 mc_dereference(pmc->mca_tomb, idev)); 2345 rcu_assign_pointer(pmc->mca_tomb, psf); 2346 rv = 1; 2347 } else { 2348 kfree_rcu(psf, rcu); 2349 } 2350 } 2351 return rv; 2352 } 2353 2354 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2355 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2356 int delta) 2357 { 2358 struct ifmcaddr6 *pmc; 2359 int changerec = 0; 2360 int i, err; 2361 2362 if (!idev) 2363 return -ENODEV; 2364 2365 mc_assert_locked(idev); 2366 2367 for_each_mc_mclock(idev, pmc) { 2368 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2369 break; 2370 } 2371 if (!pmc) 2372 return -ESRCH; 2373 2374 sf_markstate(pmc); 2375 if (!delta) { 2376 if (!pmc->mca_sfcount[sfmode]) 2377 return -EINVAL; 2378 2379 pmc->mca_sfcount[sfmode]--; 2380 } 2381 err = 0; 2382 for (i = 0; i < sfcount; i++) { 2383 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2384 2385 changerec |= rv > 0; 2386 if (!err && rv < 0) 2387 err = rv; 2388 } 2389 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2390 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2391 pmc->mca_sfcount[MCAST_INCLUDE]) { 2392 struct ip6_sf_list *psf; 2393 2394 /* filter mode change */ 2395 pmc->mca_sfmode = MCAST_INCLUDE; 2396 pmc->mca_crcount = idev->mc_qrv; 2397 idev->mc_ifc_count = pmc->mca_crcount; 2398 for_each_psf_mclock(pmc, psf) 2399 psf->sf_crcount = 0; 2400 mld_ifc_event(pmc->idev); 2401 } else if (sf_setstate(pmc) || changerec) { 2402 mld_ifc_event(pmc->idev); 2403 } 2404 2405 return err; 2406 } 2407 2408 /* Add multicast single-source filter to the interface list */ 2409 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2410 const struct in6_addr *psfsrc) 2411 { 2412 struct ip6_sf_list *psf, *psf_prev; 2413 2414 mc_assert_locked(pmc->idev); 2415 2416 psf_prev = NULL; 2417 for_each_psf_mclock(pmc, psf) { 2418 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2419 break; 2420 psf_prev = psf; 2421 } 2422 if (!psf) { 2423 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2424 if (!psf) 2425 return -ENOBUFS; 2426 2427 psf->sf_addr = *psfsrc; 2428 if (psf_prev) { 2429 rcu_assign_pointer(psf_prev->sf_next, psf); 2430 } else { 2431 rcu_assign_pointer(pmc->mca_sources, psf); 2432 } 2433 } 2434 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1); 2435 return 0; 2436 } 2437 2438 static void sf_markstate(struct ifmcaddr6 *pmc) 2439 { 2440 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2441 struct ip6_sf_list *psf; 2442 2443 mc_assert_locked(pmc->idev); 2444 2445 for_each_psf_mclock(pmc, psf) { 2446 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2447 psf->sf_oldin = mca_xcount == 2448 psf->sf_count[MCAST_EXCLUDE] && 2449 !psf->sf_count[MCAST_INCLUDE]; 2450 } else { 2451 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2452 } 2453 } 2454 } 2455 2456 static int sf_setstate(struct ifmcaddr6 *pmc) 2457 { 2458 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2459 struct ip6_sf_list *psf, *dpsf; 2460 int qrv = pmc->idev->mc_qrv; 2461 int new_in, rv; 2462 2463 mc_assert_locked(pmc->idev); 2464 2465 rv = 0; 2466 for_each_psf_mclock(pmc, psf) { 2467 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2468 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2469 !psf->sf_count[MCAST_INCLUDE]; 2470 } else 2471 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2472 if (new_in) { 2473 if (!psf->sf_oldin) { 2474 struct ip6_sf_list *prev = NULL; 2475 2476 for_each_psf_tomb(pmc, dpsf) { 2477 if (ipv6_addr_equal(&dpsf->sf_addr, 2478 &psf->sf_addr)) 2479 break; 2480 prev = dpsf; 2481 } 2482 if (dpsf) { 2483 if (prev) 2484 rcu_assign_pointer(prev->sf_next, 2485 mc_dereference(dpsf->sf_next, 2486 pmc->idev)); 2487 else 2488 rcu_assign_pointer(pmc->mca_tomb, 2489 mc_dereference(dpsf->sf_next, 2490 pmc->idev)); 2491 kfree_rcu(dpsf, rcu); 2492 } 2493 psf->sf_crcount = qrv; 2494 rv++; 2495 } 2496 } else if (psf->sf_oldin) { 2497 psf->sf_crcount = 0; 2498 /* 2499 * add or update "delete" records if an active filter 2500 * is now inactive 2501 */ 2502 2503 for_each_psf_tomb(pmc, dpsf) 2504 if (ipv6_addr_equal(&dpsf->sf_addr, 2505 &psf->sf_addr)) 2506 break; 2507 if (!dpsf) { 2508 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2509 if (!dpsf) 2510 continue; 2511 *dpsf = *psf; 2512 rcu_assign_pointer(dpsf->sf_next, 2513 mc_dereference(pmc->mca_tomb, pmc->idev)); 2514 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2515 } 2516 dpsf->sf_crcount = qrv; 2517 rv++; 2518 } 2519 } 2520 return rv; 2521 } 2522 2523 /* Add multicast source filter list to the interface list */ 2524 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2525 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2526 int delta) 2527 { 2528 struct ifmcaddr6 *pmc; 2529 int isexclude; 2530 int i, err; 2531 2532 if (!idev) 2533 return -ENODEV; 2534 2535 mc_assert_locked(idev); 2536 2537 for_each_mc_mclock(idev, pmc) { 2538 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2539 break; 2540 } 2541 if (!pmc) 2542 return -ESRCH; 2543 2544 sf_markstate(pmc); 2545 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2546 if (!delta) 2547 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2548 pmc->mca_sfcount[sfmode] + 1); 2549 err = 0; 2550 for (i = 0; i < sfcount; i++) { 2551 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2552 if (err) 2553 break; 2554 } 2555 if (err) { 2556 int j; 2557 2558 if (!delta) 2559 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2560 pmc->mca_sfcount[sfmode] - 1); 2561 for (j = 0; j < i; j++) 2562 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2563 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2564 struct ip6_sf_list *psf; 2565 2566 /* filter mode change */ 2567 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2568 pmc->mca_sfmode = MCAST_EXCLUDE; 2569 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2570 pmc->mca_sfmode = MCAST_INCLUDE; 2571 /* else no filters; keep old mode for reports */ 2572 2573 pmc->mca_crcount = idev->mc_qrv; 2574 idev->mc_ifc_count = pmc->mca_crcount; 2575 for_each_psf_mclock(pmc, psf) 2576 psf->sf_crcount = 0; 2577 mld_ifc_event(idev); 2578 } else if (sf_setstate(pmc)) { 2579 mld_ifc_event(idev); 2580 } 2581 return err; 2582 } 2583 2584 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2585 { 2586 struct ip6_sf_list *psf, *nextpsf; 2587 2588 mc_assert_locked(pmc->idev); 2589 2590 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2591 psf; 2592 psf = nextpsf) { 2593 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2594 kfree_rcu(psf, rcu); 2595 } 2596 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2597 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2598 psf; 2599 psf = nextpsf) { 2600 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2601 kfree_rcu(psf, rcu); 2602 } 2603 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2604 pmc->mca_sfmode = MCAST_EXCLUDE; 2605 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2606 /* Paired with the READ_ONCE() from ipv6_chk_mcast_addr() */ 2607 WRITE_ONCE(pmc->mca_sfcount[MCAST_EXCLUDE], 1); 2608 } 2609 2610 static void igmp6_join_group(struct ifmcaddr6 *ma) 2611 { 2612 unsigned long delay; 2613 2614 mc_assert_locked(ma->idev); 2615 2616 if (ma->mca_flags & MAF_NOREPORT) 2617 return; 2618 2619 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2620 2621 delay = get_random_u32_below(unsolicited_report_interval(ma->idev)); 2622 2623 if (cancel_delayed_work(&ma->mca_work)) { 2624 refcount_dec(&ma->mca_refcnt); 2625 delay = ma->mca_work.timer.expires - jiffies; 2626 } 2627 2628 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2629 refcount_inc(&ma->mca_refcnt); 2630 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2631 } 2632 2633 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2634 struct inet6_dev *idev) 2635 { 2636 struct ip6_sf_socklist *psl; 2637 int err; 2638 2639 psl = sock_dereference(iml->sflist, sk); 2640 2641 if (idev) 2642 mutex_lock(&idev->mc_lock); 2643 2644 if (!psl) { 2645 /* any-source empty exclude case */ 2646 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2647 } else { 2648 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2649 psl->sl_count, psl->sl_addr, 0); 2650 RCU_INIT_POINTER(iml->sflist, NULL); 2651 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2652 &sk->sk_omem_alloc); 2653 kfree_rcu(psl, rcu); 2654 } 2655 2656 if (idev) 2657 mutex_unlock(&idev->mc_lock); 2658 2659 return err; 2660 } 2661 2662 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2663 { 2664 mc_assert_locked(ma->idev); 2665 2666 if (mld_in_v1_mode(ma->idev)) { 2667 if (ma->mca_flags & MAF_LAST_REPORTER) { 2668 igmp6_send(&ma->mca_addr, ma->idev->dev, 2669 ICMPV6_MGM_REDUCTION); 2670 } 2671 } else { 2672 mld_add_delrec(ma->idev, ma); 2673 mld_ifc_event(ma->idev); 2674 } 2675 } 2676 2677 static void mld_gq_work(struct work_struct *work) 2678 { 2679 struct inet6_dev *idev = container_of(to_delayed_work(work), 2680 struct inet6_dev, 2681 mc_gq_work); 2682 2683 mutex_lock(&idev->mc_lock); 2684 mld_send_report(idev, NULL); 2685 idev->mc_gq_running = 0; 2686 mutex_unlock(&idev->mc_lock); 2687 2688 in6_dev_put(idev); 2689 } 2690 2691 static void mld_ifc_work(struct work_struct *work) 2692 { 2693 struct inet6_dev *idev = container_of(to_delayed_work(work), 2694 struct inet6_dev, 2695 mc_ifc_work); 2696 2697 mutex_lock(&idev->mc_lock); 2698 mld_send_cr(idev); 2699 2700 if (idev->mc_ifc_count) { 2701 idev->mc_ifc_count--; 2702 if (idev->mc_ifc_count) 2703 mld_ifc_start_work(idev, 2704 unsolicited_report_interval(idev)); 2705 } 2706 mutex_unlock(&idev->mc_lock); 2707 in6_dev_put(idev); 2708 } 2709 2710 static void mld_ifc_event(struct inet6_dev *idev) 2711 { 2712 mc_assert_locked(idev); 2713 2714 if (mld_in_v1_mode(idev)) 2715 return; 2716 2717 idev->mc_ifc_count = idev->mc_qrv; 2718 mld_ifc_start_work(idev, 1); 2719 } 2720 2721 static void mld_mca_work(struct work_struct *work) 2722 { 2723 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2724 struct ifmcaddr6, mca_work); 2725 2726 mutex_lock(&ma->idev->mc_lock); 2727 if (mld_in_v1_mode(ma->idev)) 2728 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2729 else 2730 mld_send_report(ma->idev, ma); 2731 ma->mca_flags |= MAF_LAST_REPORTER; 2732 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2733 mutex_unlock(&ma->idev->mc_lock); 2734 2735 ma_put(ma); 2736 } 2737 2738 /* Device changing type */ 2739 2740 void ipv6_mc_unmap(struct inet6_dev *idev) 2741 { 2742 struct ifmcaddr6 *i; 2743 2744 /* Install multicast list, except for all-nodes (already installed) */ 2745 2746 mutex_lock(&idev->mc_lock); 2747 for_each_mc_mclock(idev, i) 2748 igmp6_group_dropped(i); 2749 mutex_unlock(&idev->mc_lock); 2750 } 2751 2752 void ipv6_mc_remap(struct inet6_dev *idev) 2753 { 2754 ipv6_mc_up(idev); 2755 } 2756 2757 /* Device going down */ 2758 void ipv6_mc_down(struct inet6_dev *idev) 2759 { 2760 struct ifmcaddr6 *i; 2761 2762 mutex_lock(&idev->mc_lock); 2763 /* Withdraw multicast list */ 2764 for_each_mc_mclock(idev, i) 2765 igmp6_group_dropped(i); 2766 mutex_unlock(&idev->mc_lock); 2767 2768 /* Should stop work after group drop. or we will 2769 * start work again in mld_ifc_event() 2770 */ 2771 mld_query_stop_work(idev); 2772 mld_report_stop_work(idev); 2773 2774 mutex_lock(&idev->mc_lock); 2775 mld_ifc_stop_work(idev); 2776 mld_gq_stop_work(idev); 2777 mutex_unlock(&idev->mc_lock); 2778 2779 mld_dad_stop_work(idev); 2780 } 2781 2782 static void ipv6_mc_reset(struct inet6_dev *idev) 2783 { 2784 idev->mc_qrv = sysctl_mld_qrv; 2785 idev->mc_qi = MLD_QI_DEFAULT; 2786 idev->mc_qri = MLD_QRI_DEFAULT; 2787 idev->mc_v1_seen = 0; 2788 idev->mc_maxdelay = unsolicited_report_interval(idev); 2789 } 2790 2791 /* Device going up */ 2792 2793 void ipv6_mc_up(struct inet6_dev *idev) 2794 { 2795 struct ifmcaddr6 *i; 2796 2797 /* Install multicast list, except for all-nodes (already installed) */ 2798 2799 ipv6_mc_reset(idev); 2800 mutex_lock(&idev->mc_lock); 2801 for_each_mc_mclock(idev, i) { 2802 mld_del_delrec(idev, i); 2803 igmp6_group_added(i); 2804 } 2805 mutex_unlock(&idev->mc_lock); 2806 } 2807 2808 /* IPv6 device initialization. */ 2809 2810 void ipv6_mc_init_dev(struct inet6_dev *idev) 2811 { 2812 idev->mc_gq_running = 0; 2813 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2814 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2815 idev->mc_ifc_count = 0; 2816 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2817 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2818 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2819 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2820 skb_queue_head_init(&idev->mc_query_queue); 2821 skb_queue_head_init(&idev->mc_report_queue); 2822 spin_lock_init(&idev->mc_query_lock); 2823 spin_lock_init(&idev->mc_report_lock); 2824 mutex_init(&idev->mc_lock); 2825 ipv6_mc_reset(idev); 2826 } 2827 2828 /* 2829 * Device is about to be destroyed: clean up. 2830 */ 2831 2832 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2833 { 2834 struct ifmcaddr6 *i; 2835 2836 /* Deactivate works */ 2837 ipv6_mc_down(idev); 2838 mutex_lock(&idev->mc_lock); 2839 mld_clear_delrec(idev); 2840 mutex_unlock(&idev->mc_lock); 2841 mld_clear_query(idev); 2842 mld_clear_report(idev); 2843 2844 /* Delete all-nodes address. */ 2845 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2846 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2847 * fail. 2848 */ 2849 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2850 2851 if (idev->cnf.forwarding) 2852 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2853 2854 mutex_lock(&idev->mc_lock); 2855 while ((i = mc_dereference(idev->mc_list, idev))) { 2856 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2857 2858 ip6_mc_clear_src(i); 2859 ma_put(i); 2860 } 2861 mutex_unlock(&idev->mc_lock); 2862 } 2863 2864 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2865 { 2866 struct ifmcaddr6 *pmc; 2867 2868 mutex_lock(&idev->mc_lock); 2869 if (mld_in_v1_mode(idev)) { 2870 for_each_mc_mclock(idev, pmc) 2871 igmp6_join_group(pmc); 2872 } else { 2873 mld_send_report(idev, NULL); 2874 } 2875 mutex_unlock(&idev->mc_lock); 2876 } 2877 2878 static int ipv6_mc_netdev_event(struct notifier_block *this, 2879 unsigned long event, 2880 void *ptr) 2881 { 2882 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2883 struct inet6_dev *idev = __in6_dev_get(dev); 2884 2885 switch (event) { 2886 case NETDEV_RESEND_IGMP: 2887 if (idev) 2888 ipv6_mc_rejoin_groups(idev); 2889 break; 2890 default: 2891 break; 2892 } 2893 2894 return NOTIFY_DONE; 2895 } 2896 2897 static struct notifier_block igmp6_netdev_notifier = { 2898 .notifier_call = ipv6_mc_netdev_event, 2899 }; 2900 2901 #ifdef CONFIG_PROC_FS 2902 struct igmp6_mc_iter_state { 2903 struct seq_net_private p; 2904 struct net_device *dev; 2905 struct inet6_dev *idev; 2906 }; 2907 2908 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2909 2910 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2911 { 2912 struct ifmcaddr6 *im = NULL; 2913 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2914 struct net *net = seq_file_net(seq); 2915 2916 state->idev = NULL; 2917 for_each_netdev_rcu(net, state->dev) { 2918 struct inet6_dev *idev; 2919 idev = __in6_dev_get(state->dev); 2920 if (!idev) 2921 continue; 2922 2923 im = rcu_dereference(idev->mc_list); 2924 if (im) { 2925 state->idev = idev; 2926 break; 2927 } 2928 } 2929 return im; 2930 } 2931 2932 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2933 { 2934 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2935 2936 im = rcu_dereference(im->next); 2937 while (!im) { 2938 state->dev = next_net_device_rcu(state->dev); 2939 if (!state->dev) { 2940 state->idev = NULL; 2941 break; 2942 } 2943 state->idev = __in6_dev_get(state->dev); 2944 if (!state->idev) 2945 continue; 2946 im = rcu_dereference(state->idev->mc_list); 2947 } 2948 return im; 2949 } 2950 2951 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2952 { 2953 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2954 if (im) 2955 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2956 --pos; 2957 return pos ? NULL : im; 2958 } 2959 2960 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2961 __acquires(RCU) 2962 { 2963 rcu_read_lock(); 2964 return igmp6_mc_get_idx(seq, *pos); 2965 } 2966 2967 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2968 { 2969 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2970 2971 ++*pos; 2972 return im; 2973 } 2974 2975 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2976 __releases(RCU) 2977 { 2978 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2979 2980 if (likely(state->idev)) 2981 state->idev = NULL; 2982 state->dev = NULL; 2983 rcu_read_unlock(); 2984 } 2985 2986 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2987 { 2988 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2989 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2990 2991 seq_printf(seq, 2992 "%-4d %-15s %pi6 %5d %08X %ld\n", 2993 state->dev->ifindex, state->dev->name, 2994 &im->mca_addr, 2995 im->mca_users, im->mca_flags, 2996 (im->mca_flags & MAF_TIMER_RUNNING) ? 2997 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2998 return 0; 2999 } 3000 3001 static const struct seq_operations igmp6_mc_seq_ops = { 3002 .start = igmp6_mc_seq_start, 3003 .next = igmp6_mc_seq_next, 3004 .stop = igmp6_mc_seq_stop, 3005 .show = igmp6_mc_seq_show, 3006 }; 3007 3008 struct igmp6_mcf_iter_state { 3009 struct seq_net_private p; 3010 struct net_device *dev; 3011 struct inet6_dev *idev; 3012 struct ifmcaddr6 *im; 3013 }; 3014 3015 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 3016 3017 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 3018 { 3019 struct ip6_sf_list *psf = NULL; 3020 struct ifmcaddr6 *im = NULL; 3021 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3022 struct net *net = seq_file_net(seq); 3023 3024 state->idev = NULL; 3025 state->im = NULL; 3026 for_each_netdev_rcu(net, state->dev) { 3027 struct inet6_dev *idev; 3028 idev = __in6_dev_get(state->dev); 3029 if (unlikely(idev == NULL)) 3030 continue; 3031 3032 im = rcu_dereference(idev->mc_list); 3033 if (likely(im)) { 3034 psf = rcu_dereference(im->mca_sources); 3035 if (likely(psf)) { 3036 state->im = im; 3037 state->idev = idev; 3038 break; 3039 } 3040 } 3041 } 3042 return psf; 3043 } 3044 3045 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3046 { 3047 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3048 3049 psf = rcu_dereference(psf->sf_next); 3050 while (!psf) { 3051 state->im = rcu_dereference(state->im->next); 3052 while (!state->im) { 3053 state->dev = next_net_device_rcu(state->dev); 3054 if (!state->dev) { 3055 state->idev = NULL; 3056 goto out; 3057 } 3058 state->idev = __in6_dev_get(state->dev); 3059 if (!state->idev) 3060 continue; 3061 state->im = rcu_dereference(state->idev->mc_list); 3062 } 3063 psf = rcu_dereference(state->im->mca_sources); 3064 } 3065 out: 3066 return psf; 3067 } 3068 3069 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3070 { 3071 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3072 if (psf) 3073 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3074 --pos; 3075 return pos ? NULL : psf; 3076 } 3077 3078 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3079 __acquires(RCU) 3080 { 3081 rcu_read_lock(); 3082 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3083 } 3084 3085 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3086 { 3087 struct ip6_sf_list *psf; 3088 if (v == SEQ_START_TOKEN) 3089 psf = igmp6_mcf_get_first(seq); 3090 else 3091 psf = igmp6_mcf_get_next(seq, v); 3092 ++*pos; 3093 return psf; 3094 } 3095 3096 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3097 __releases(RCU) 3098 { 3099 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3100 3101 if (likely(state->im)) 3102 state->im = NULL; 3103 if (likely(state->idev)) 3104 state->idev = NULL; 3105 3106 state->dev = NULL; 3107 rcu_read_unlock(); 3108 } 3109 3110 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3111 { 3112 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3113 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3114 3115 if (v == SEQ_START_TOKEN) { 3116 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3117 } else { 3118 seq_printf(seq, 3119 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3120 state->dev->ifindex, state->dev->name, 3121 &state->im->mca_addr, 3122 &psf->sf_addr, 3123 READ_ONCE(psf->sf_count[MCAST_INCLUDE]), 3124 READ_ONCE(psf->sf_count[MCAST_EXCLUDE])); 3125 } 3126 return 0; 3127 } 3128 3129 static const struct seq_operations igmp6_mcf_seq_ops = { 3130 .start = igmp6_mcf_seq_start, 3131 .next = igmp6_mcf_seq_next, 3132 .stop = igmp6_mcf_seq_stop, 3133 .show = igmp6_mcf_seq_show, 3134 }; 3135 3136 static int __net_init igmp6_proc_init(struct net *net) 3137 { 3138 int err; 3139 3140 err = -ENOMEM; 3141 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3142 sizeof(struct igmp6_mc_iter_state))) 3143 goto out; 3144 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3145 &igmp6_mcf_seq_ops, 3146 sizeof(struct igmp6_mcf_iter_state))) 3147 goto out_proc_net_igmp6; 3148 3149 err = 0; 3150 out: 3151 return err; 3152 3153 out_proc_net_igmp6: 3154 remove_proc_entry("igmp6", net->proc_net); 3155 goto out; 3156 } 3157 3158 static void __net_exit igmp6_proc_exit(struct net *net) 3159 { 3160 remove_proc_entry("mcfilter6", net->proc_net); 3161 remove_proc_entry("igmp6", net->proc_net); 3162 } 3163 #else 3164 static inline int igmp6_proc_init(struct net *net) 3165 { 3166 return 0; 3167 } 3168 static inline void igmp6_proc_exit(struct net *net) 3169 { 3170 } 3171 #endif 3172 3173 static int __net_init igmp6_net_init(struct net *net) 3174 { 3175 int err; 3176 3177 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3178 SOCK_RAW, IPPROTO_ICMPV6, net); 3179 if (err < 0) { 3180 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3181 err); 3182 goto out; 3183 } 3184 3185 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3186 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3187 3188 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3189 SOCK_RAW, IPPROTO_ICMPV6, net); 3190 if (err < 0) { 3191 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3192 err); 3193 goto out_sock_create; 3194 } 3195 3196 err = igmp6_proc_init(net); 3197 if (err) 3198 goto out_sock_create_autojoin; 3199 3200 return 0; 3201 3202 out_sock_create_autojoin: 3203 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3204 out_sock_create: 3205 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3206 out: 3207 return err; 3208 } 3209 3210 static void __net_exit igmp6_net_exit(struct net *net) 3211 { 3212 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3213 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3214 igmp6_proc_exit(net); 3215 } 3216 3217 static struct pernet_operations igmp6_net_ops = { 3218 .init = igmp6_net_init, 3219 .exit = igmp6_net_exit, 3220 }; 3221 3222 int __init igmp6_init(void) 3223 { 3224 int err; 3225 3226 err = register_pernet_subsys(&igmp6_net_ops); 3227 if (err) 3228 return err; 3229 3230 mld_wq = create_workqueue("mld"); 3231 if (!mld_wq) { 3232 unregister_pernet_subsys(&igmp6_net_ops); 3233 return -ENOMEM; 3234 } 3235 3236 return err; 3237 } 3238 3239 int __init igmp6_late_init(void) 3240 { 3241 return register_netdevice_notifier(&igmp6_netdev_notifier); 3242 } 3243 3244 void igmp6_cleanup(void) 3245 { 3246 unregister_pernet_subsys(&igmp6_net_ops); 3247 destroy_workqueue(mld_wq); 3248 } 3249 3250 void igmp6_late_cleanup(void) 3251 { 3252 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3253 } 3254