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 WRITE_ONCE(mc->mca_flags, 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 WRITE_ONCE(mc->mca_flags, 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 WRITE_ONCE(mc->mca_flags, 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 (in6_dev_hold_safe(idev)) { 1087 if (mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1088 in6_dev_put(idev); 1089 } 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 (in6_dev_hold_safe(idev)) { 1108 if (mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1109 in6_dev_put(idev); 1110 } 1111 } 1112 1113 static void mld_ifc_stop_work(struct inet6_dev *idev) 1114 { 1115 mc_assert_locked(idev); 1116 1117 idev->mc_ifc_count = 0; 1118 if (cancel_delayed_work(&idev->mc_ifc_work)) 1119 __in6_dev_put(idev); 1120 } 1121 1122 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1123 { 1124 unsigned long tv = get_random_u32_below(delay); 1125 1126 mc_assert_locked(idev); 1127 1128 if (in6_dev_hold_safe(idev)) { 1129 if (mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1130 in6_dev_put(idev); 1131 } 1132 } 1133 1134 static void mld_dad_stop_work(struct inet6_dev *idev) 1135 { 1136 if (cancel_delayed_work(&idev->mc_dad_work)) 1137 __in6_dev_put(idev); 1138 } 1139 1140 static void mld_query_stop_work(struct inet6_dev *idev) 1141 { 1142 spin_lock_bh(&idev->mc_query_lock); 1143 if (cancel_delayed_work(&idev->mc_query_work)) 1144 __in6_dev_put(idev); 1145 spin_unlock_bh(&idev->mc_query_lock); 1146 } 1147 1148 static void mld_report_stop_work(struct inet6_dev *idev) 1149 { 1150 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1151 __in6_dev_put(idev); 1152 } 1153 1154 /* IGMP handling (alias multicast ICMPv6 messages) */ 1155 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1156 { 1157 unsigned long delay = resptime; 1158 1159 mc_assert_locked(ma->idev); 1160 1161 /* Do not start work for these addresses */ 1162 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1163 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1164 return; 1165 1166 if (cancel_delayed_work(&ma->mca_work)) { 1167 refcount_dec(&ma->mca_refcnt); 1168 delay = ma->mca_work.timer.expires - jiffies; 1169 } 1170 1171 if (delay >= resptime) 1172 delay = get_random_u32_below(resptime); 1173 1174 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1175 refcount_inc(&ma->mca_refcnt); 1176 WRITE_ONCE(ma->mca_flags, ma->mca_flags | MAF_TIMER_RUNNING); 1177 } 1178 1179 /* mark EXCLUDE-mode sources */ 1180 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1181 const struct in6_addr *srcs) 1182 { 1183 struct ip6_sf_list *psf; 1184 int i, scount; 1185 1186 mc_assert_locked(pmc->idev); 1187 1188 scount = 0; 1189 for_each_psf_mclock(pmc, psf) { 1190 if (scount == nsrcs) 1191 break; 1192 for (i = 0; i < nsrcs; i++) { 1193 /* skip inactive filters */ 1194 if (psf->sf_count[MCAST_INCLUDE] || 1195 pmc->mca_sfcount[MCAST_EXCLUDE] != 1196 psf->sf_count[MCAST_EXCLUDE]) 1197 break; 1198 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1199 scount++; 1200 break; 1201 } 1202 } 1203 } 1204 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 1205 if (scount == nsrcs) /* all sources excluded */ 1206 return false; 1207 return true; 1208 } 1209 1210 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1211 const struct in6_addr *srcs) 1212 { 1213 struct ip6_sf_list *psf; 1214 int i, scount; 1215 1216 mc_assert_locked(pmc->idev); 1217 1218 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1219 return mld_xmarksources(pmc, nsrcs, srcs); 1220 1221 /* mark INCLUDE-mode sources */ 1222 1223 scount = 0; 1224 for_each_psf_mclock(pmc, psf) { 1225 if (scount == nsrcs) 1226 break; 1227 for (i = 0; i < nsrcs; i++) { 1228 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1229 psf->sf_gsresp = 1; 1230 scount++; 1231 break; 1232 } 1233 } 1234 } 1235 if (!scount) { 1236 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 1237 return false; 1238 } 1239 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags | MAF_GSQUERY); 1240 return true; 1241 } 1242 1243 static int mld_force_mld_version(const struct inet6_dev *idev) 1244 { 1245 const struct net *net = dev_net(idev->dev); 1246 int all_force; 1247 1248 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1249 /* Normally, both are 0 here. If enforcement to a particular is 1250 * being used, individual device enforcement will have a lower 1251 * precedence over 'all' device (.../conf/all/force_mld_version). 1252 */ 1253 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1254 } 1255 1256 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1257 { 1258 return mld_force_mld_version(idev) == 2; 1259 } 1260 1261 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1262 { 1263 return mld_force_mld_version(idev) == 1; 1264 } 1265 1266 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1267 { 1268 if (mld_in_v2_mode_only(idev)) 1269 return false; 1270 if (mld_in_v1_mode_only(idev)) 1271 return true; 1272 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1273 return true; 1274 1275 return false; 1276 } 1277 1278 static void mld_set_v1_mode(struct inet6_dev *idev) 1279 { 1280 /* RFC3810, relevant sections: 1281 * - 9.1. Robustness Variable 1282 * - 9.2. Query Interval 1283 * - 9.3. Query Response Interval 1284 * - 9.12. Older Version Querier Present Timeout 1285 */ 1286 unsigned long switchback; 1287 1288 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1289 1290 idev->mc_v1_seen = jiffies + switchback; 1291 } 1292 1293 static void mld_update_qrv(struct inet6_dev *idev, 1294 const struct mld2_query *mlh2) 1295 { 1296 /* RFC3810, relevant sections: 1297 * - 5.1.8. QRV (Querier's Robustness Variable) 1298 * - 9.1. Robustness Variable 1299 */ 1300 1301 /* The value of the Robustness Variable MUST NOT be zero, 1302 * and SHOULD NOT be one. Catch this here if we ever run 1303 * into such a case in future. 1304 */ 1305 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1306 WARN_ON(idev->mc_qrv == 0); 1307 1308 if (mlh2->mld2q_qrv > 0) 1309 idev->mc_qrv = mlh2->mld2q_qrv; 1310 1311 if (unlikely(idev->mc_qrv < min_qrv)) { 1312 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1313 idev->mc_qrv, min_qrv); 1314 idev->mc_qrv = min_qrv; 1315 } 1316 } 1317 1318 static void mld_update_qi(struct inet6_dev *idev, 1319 const struct mld2_query *mlh2) 1320 { 1321 /* RFC3810, relevant sections: 1322 * - 5.1.9. QQIC (Querier's Query Interval Code) 1323 * - 9.2. Query Interval 1324 * - 9.12. Older Version Querier Present Timeout 1325 * (the [Query Interval] in the last Query received) 1326 */ 1327 idev->mc_qi = mldv2_qqi(mlh2) * HZ; 1328 } 1329 1330 static void mld_update_qri(struct inet6_dev *idev, 1331 const struct mld2_query *mlh2) 1332 { 1333 /* RFC3810, relevant sections: 1334 * - 5.1.3. Maximum Response Code 1335 * - 9.3. Query Response Interval 1336 */ 1337 idev->mc_qri = msecs_to_jiffies(mldv2_mrd(mlh2)); 1338 } 1339 1340 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1341 unsigned long *max_delay, bool v1_query) 1342 { 1343 unsigned long mldv1_md; 1344 1345 /* Ignore v1 queries */ 1346 if (mld_in_v2_mode_only(idev)) 1347 return -EINVAL; 1348 1349 mldv1_md = ntohs(mld->mld_maxdelay); 1350 1351 /* When in MLDv1 fallback and a MLDv2 router start-up being 1352 * unaware of current MLDv1 operation, the MRC == MRD mapping 1353 * only works when the exponential algorithm is not being 1354 * used (as MLDv1 is unaware of such things). 1355 * 1356 * According to the RFC author, the MLDv2 implementations 1357 * he's aware of all use a MRC < 32768 on start up queries. 1358 * 1359 * Thus, should we *ever* encounter something else larger 1360 * than that, just assume the maximum possible within our 1361 * reach. 1362 */ 1363 if (!v1_query) 1364 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1365 1366 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1367 1368 /* MLDv1 router present: we need to go into v1 mode *only* 1369 * when an MLDv1 query is received as per section 9.12. of 1370 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1371 * queries MUST be of exactly 24 octets. 1372 */ 1373 if (v1_query) 1374 mld_set_v1_mode(idev); 1375 1376 /* cancel MLDv2 report work */ 1377 mld_gq_stop_work(idev); 1378 /* cancel the interface change work */ 1379 mld_ifc_stop_work(idev); 1380 /* clear deleted report items */ 1381 mld_clear_delrec(idev); 1382 1383 return 0; 1384 } 1385 1386 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1387 unsigned long *max_delay) 1388 { 1389 *max_delay = max(msecs_to_jiffies(mldv2_mrd(mld)), 1UL); 1390 1391 mld_update_qrv(idev, mld); 1392 mld_update_qi(idev, mld); 1393 mld_update_qri(idev, mld); 1394 1395 idev->mc_maxdelay = *max_delay; 1396 1397 return; 1398 } 1399 1400 /* called with rcu_read_lock() */ 1401 void igmp6_event_query(struct sk_buff *skb) 1402 { 1403 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1404 bool put = false; 1405 1406 if (!idev || idev->dead) 1407 goto out; 1408 1409 spin_lock_bh(&idev->mc_query_lock); 1410 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS && 1411 in6_dev_hold_safe(idev)) { 1412 __skb_queue_tail(&idev->mc_query_queue, skb); 1413 if (mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1414 put = true; 1415 skb = NULL; 1416 } 1417 spin_unlock_bh(&idev->mc_query_lock); 1418 1419 if (put) 1420 in6_dev_put(idev); 1421 out: 1422 kfree_skb(skb); 1423 } 1424 1425 static void __mld_query_work(struct sk_buff *skb) 1426 { 1427 struct mld2_query *mlh2 = NULL; 1428 unsigned long max_delay; 1429 struct inet6_dev *idev; 1430 struct in6_addr group; 1431 struct ifmcaddr6 *ma; 1432 struct mld_msg *mld; 1433 int group_type; 1434 int mark = 0; 1435 int len, err; 1436 1437 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1438 goto kfree_skb; 1439 1440 /* compute payload length excluding extension headers */ 1441 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1442 len -= skb_network_header_len(skb); 1443 1444 /* RFC3810 6.2 1445 * Upon reception of an MLD message that contains a Query, the node 1446 * checks if the source address of the message is a valid link-local 1447 * address, if the Hop Limit is set to 1, and if the Router Alert 1448 * option is present in the Hop-By-Hop Options header of the IPv6 1449 * packet. If any of these checks fails, the packet is dropped. 1450 */ 1451 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1452 ipv6_hdr(skb)->hop_limit != 1 || 1453 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1454 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1455 goto kfree_skb; 1456 1457 idev = in6_dev_get(skb->dev); 1458 if (!idev) 1459 goto kfree_skb; 1460 1461 mld = (struct mld_msg *)icmp6_hdr(skb); 1462 group = mld->mld_mca; 1463 group_type = ipv6_addr_type(&group); 1464 1465 if (group_type != IPV6_ADDR_ANY && 1466 !(group_type&IPV6_ADDR_MULTICAST)) 1467 goto out; 1468 1469 if (len < MLD_V1_QUERY_LEN) { 1470 goto out; 1471 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1472 err = mld_process_v1(idev, mld, &max_delay, 1473 len == MLD_V1_QUERY_LEN); 1474 if (err < 0) 1475 goto out; 1476 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1477 int srcs_offset = sizeof(struct mld2_query) - 1478 sizeof(struct icmp6hdr); 1479 1480 if (!pskb_may_pull(skb, srcs_offset)) 1481 goto out; 1482 1483 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1484 1485 mld_process_v2(idev, mlh2, &max_delay); 1486 1487 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1488 if (mlh2->mld2q_nsrcs) 1489 goto out; /* no sources allowed */ 1490 1491 mld_gq_start_work(idev); 1492 goto out; 1493 } 1494 /* mark sources to include, if group & source-specific */ 1495 if (mlh2->mld2q_nsrcs != 0) { 1496 if (!pskb_may_pull(skb, srcs_offset + 1497 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1498 goto out; 1499 1500 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1501 mark = 1; 1502 } 1503 } else { 1504 goto out; 1505 } 1506 1507 if (group_type == IPV6_ADDR_ANY) { 1508 for_each_mc_mclock(idev, ma) { 1509 igmp6_group_queried(ma, max_delay); 1510 } 1511 } else { 1512 for_each_mc_mclock(idev, ma) { 1513 unsigned int flags; 1514 1515 if (!ipv6_addr_equal(&group, &ma->mca_addr)) 1516 continue; 1517 flags = ma->mca_flags; 1518 1519 if (flags & MAF_TIMER_RUNNING) { 1520 /* gsquery <- gsquery && mark */ 1521 if (!mark) 1522 WRITE_ONCE(ma->mca_flags, 1523 flags & ~MAF_GSQUERY); 1524 } else { 1525 /* gsquery <- mark */ 1526 if (mark) 1527 WRITE_ONCE(ma->mca_flags, 1528 flags | MAF_GSQUERY); 1529 else 1530 WRITE_ONCE(ma->mca_flags, 1531 flags & ~MAF_GSQUERY); 1532 } 1533 if (!(ma->mca_flags & MAF_GSQUERY) || 1534 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1535 igmp6_group_queried(ma, max_delay); 1536 break; 1537 } 1538 } 1539 1540 out: 1541 in6_dev_put(idev); 1542 kfree_skb: 1543 consume_skb(skb); 1544 } 1545 1546 static void mld_query_work(struct work_struct *work) 1547 { 1548 struct inet6_dev *idev = container_of(to_delayed_work(work), 1549 struct inet6_dev, 1550 mc_query_work); 1551 struct sk_buff_head q; 1552 struct sk_buff *skb; 1553 bool rework = false; 1554 int cnt = 0; 1555 1556 skb_queue_head_init(&q); 1557 1558 spin_lock_bh(&idev->mc_query_lock); 1559 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1560 __skb_queue_tail(&q, skb); 1561 1562 if (++cnt >= MLD_MAX_QUEUE) { 1563 rework = true; 1564 break; 1565 } 1566 } 1567 spin_unlock_bh(&idev->mc_query_lock); 1568 1569 mutex_lock(&idev->mc_lock); 1570 while ((skb = __skb_dequeue(&q))) 1571 __mld_query_work(skb); 1572 mutex_unlock(&idev->mc_lock); 1573 1574 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1575 return; 1576 1577 in6_dev_put(idev); 1578 } 1579 1580 /* called with rcu_read_lock() */ 1581 void igmp6_event_report(struct sk_buff *skb) 1582 { 1583 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1584 bool put = false; 1585 1586 if (!idev || idev->dead) 1587 goto out; 1588 1589 spin_lock_bh(&idev->mc_report_lock); 1590 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS && 1591 in6_dev_hold_safe(idev)) { 1592 __skb_queue_tail(&idev->mc_report_queue, skb); 1593 if (mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1594 put = true; 1595 skb = NULL; 1596 } 1597 spin_unlock_bh(&idev->mc_report_lock); 1598 1599 if (put) 1600 in6_dev_put(idev); 1601 out: 1602 kfree_skb(skb); 1603 } 1604 1605 static void __mld_report_work(struct sk_buff *skb) 1606 { 1607 struct inet6_dev *idev; 1608 struct ifmcaddr6 *ma; 1609 struct mld_msg *mld; 1610 int addr_type; 1611 1612 /* Our own report looped back. Ignore it. */ 1613 if (skb->pkt_type == PACKET_LOOPBACK) 1614 goto kfree_skb; 1615 1616 /* send our report if the MC router may not have heard this report */ 1617 if (skb->pkt_type != PACKET_MULTICAST && 1618 skb->pkt_type != PACKET_BROADCAST) 1619 goto kfree_skb; 1620 1621 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1622 goto kfree_skb; 1623 1624 mld = (struct mld_msg *)icmp6_hdr(skb); 1625 1626 /* Drop reports with not link local source */ 1627 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1628 if (addr_type != IPV6_ADDR_ANY && 1629 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1630 goto kfree_skb; 1631 1632 idev = in6_dev_get(skb->dev); 1633 if (!idev) 1634 goto kfree_skb; 1635 1636 /* 1637 * Cancel the work for this group 1638 */ 1639 1640 for_each_mc_mclock(idev, ma) { 1641 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1642 if (cancel_delayed_work(&ma->mca_work)) 1643 refcount_dec(&ma->mca_refcnt); 1644 WRITE_ONCE(ma->mca_flags, 1645 ma->mca_flags & ~(MAF_LAST_REPORTER | 1646 MAF_TIMER_RUNNING)); 1647 break; 1648 } 1649 } 1650 1651 in6_dev_put(idev); 1652 kfree_skb: 1653 consume_skb(skb); 1654 } 1655 1656 static void mld_report_work(struct work_struct *work) 1657 { 1658 struct inet6_dev *idev = container_of(to_delayed_work(work), 1659 struct inet6_dev, 1660 mc_report_work); 1661 struct sk_buff_head q; 1662 struct sk_buff *skb; 1663 bool rework = false; 1664 int cnt = 0; 1665 1666 skb_queue_head_init(&q); 1667 spin_lock_bh(&idev->mc_report_lock); 1668 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1669 __skb_queue_tail(&q, skb); 1670 1671 if (++cnt >= MLD_MAX_QUEUE) { 1672 rework = true; 1673 break; 1674 } 1675 } 1676 spin_unlock_bh(&idev->mc_report_lock); 1677 1678 mutex_lock(&idev->mc_lock); 1679 while ((skb = __skb_dequeue(&q))) 1680 __mld_report_work(skb); 1681 mutex_unlock(&idev->mc_lock); 1682 1683 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1684 return; 1685 1686 in6_dev_put(idev); 1687 } 1688 1689 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1690 int gdeleted, int sdeleted) 1691 { 1692 switch (type) { 1693 case MLD2_MODE_IS_INCLUDE: 1694 case MLD2_MODE_IS_EXCLUDE: 1695 if (gdeleted || sdeleted) 1696 return false; 1697 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1698 if (pmc->mca_sfmode == MCAST_INCLUDE) 1699 return true; 1700 /* don't include if this source is excluded 1701 * in all filters 1702 */ 1703 if (psf->sf_count[MCAST_INCLUDE]) 1704 return type == MLD2_MODE_IS_INCLUDE; 1705 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1706 psf->sf_count[MCAST_EXCLUDE]; 1707 } 1708 return false; 1709 case MLD2_CHANGE_TO_INCLUDE: 1710 if (gdeleted || sdeleted) 1711 return false; 1712 return psf->sf_count[MCAST_INCLUDE] != 0; 1713 case MLD2_CHANGE_TO_EXCLUDE: 1714 if (gdeleted || sdeleted) 1715 return false; 1716 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1717 psf->sf_count[MCAST_INCLUDE]) 1718 return false; 1719 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1720 psf->sf_count[MCAST_EXCLUDE]; 1721 case MLD2_ALLOW_NEW_SOURCES: 1722 if (gdeleted || !psf->sf_crcount) 1723 return false; 1724 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1725 case MLD2_BLOCK_OLD_SOURCES: 1726 if (pmc->mca_sfmode == MCAST_INCLUDE) 1727 return gdeleted || (psf->sf_crcount && sdeleted); 1728 return psf->sf_crcount && !gdeleted && !sdeleted; 1729 } 1730 return false; 1731 } 1732 1733 static int 1734 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1735 { 1736 struct ip6_sf_list *psf; 1737 int scount = 0; 1738 1739 for_each_psf_mclock(pmc, psf) { 1740 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1741 continue; 1742 scount++; 1743 } 1744 return scount; 1745 } 1746 1747 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1748 struct net_device *dev, const struct in6_addr *saddr, 1749 const struct in6_addr *daddr, int proto, int len) 1750 { 1751 struct ipv6hdr *hdr; 1752 1753 skb->protocol = htons(ETH_P_IPV6); 1754 skb->dev = dev; 1755 1756 skb_reset_network_header(skb); 1757 skb_put(skb, sizeof(struct ipv6hdr)); 1758 hdr = ipv6_hdr(skb); 1759 1760 ip6_flow_hdr(hdr, 0, 0); 1761 1762 hdr->payload_len = htons(len); 1763 hdr->nexthdr = proto; 1764 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1765 1766 hdr->saddr = *saddr; 1767 hdr->daddr = *daddr; 1768 } 1769 1770 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1771 { 1772 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1773 2, 0, 0, IPV6_TLV_PADN, 0 }; 1774 struct net_device *dev = idev->dev; 1775 int hlen = LL_RESERVED_SPACE(dev); 1776 int tlen = dev->needed_tailroom; 1777 const struct in6_addr *saddr; 1778 struct in6_addr addr_buf; 1779 struct mld2_report *pmr; 1780 struct sk_buff *skb; 1781 unsigned int size; 1782 struct sock *sk; 1783 struct net *net; 1784 1785 /* we assume size > sizeof(ra) here 1786 * Also try to not allocate high-order pages for big MTU 1787 */ 1788 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1789 skb = alloc_skb(size, GFP_KERNEL); 1790 if (!skb) 1791 return NULL; 1792 1793 skb->priority = TC_PRIO_CONTROL; 1794 skb_reserve(skb, hlen); 1795 skb_tailroom_reserve(skb, mtu, tlen); 1796 1797 rcu_read_lock(); 1798 1799 net = dev_net_rcu(dev); 1800 sk = net->ipv6.igmp_sk; 1801 skb_set_owner_w(skb, sk); 1802 1803 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1804 /* <draft-ietf-magma-mld-source-05.txt>: 1805 * use unspecified address as the source address 1806 * when a valid link-local address is not available. 1807 */ 1808 saddr = &in6addr_any; 1809 } else 1810 saddr = &addr_buf; 1811 1812 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1813 1814 rcu_read_unlock(); 1815 1816 skb_put_data(skb, ra, sizeof(ra)); 1817 1818 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1819 skb_put(skb, sizeof(*pmr)); 1820 pmr = (struct mld2_report *)skb_transport_header(skb); 1821 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1822 pmr->mld2r_resv1 = 0; 1823 pmr->mld2r_cksum = 0; 1824 pmr->mld2r_resv2 = 0; 1825 pmr->mld2r_ngrec = 0; 1826 return skb; 1827 } 1828 1829 static void mld_sendpack(struct sk_buff *skb) 1830 { 1831 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1832 struct mld2_report *pmr = 1833 (struct mld2_report *)skb_transport_header(skb); 1834 int payload_len, mldlen; 1835 struct inet6_dev *idev; 1836 struct net *net = dev_net(skb->dev); 1837 int err; 1838 struct flowi6 fl6; 1839 struct dst_entry *dst; 1840 1841 rcu_read_lock(); 1842 idev = __in6_dev_get(skb->dev); 1843 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1844 1845 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1846 sizeof(*pip6); 1847 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1848 pip6->payload_len = htons(payload_len); 1849 1850 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1851 IPPROTO_ICMPV6, 1852 csum_partial(skb_transport_header(skb), 1853 mldlen, 0)); 1854 1855 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1856 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1857 skb->dev->ifindex); 1858 dst = icmp6_dst_alloc(skb->dev, &fl6); 1859 1860 err = 0; 1861 if (IS_ERR(dst)) { 1862 err = PTR_ERR(dst); 1863 dst = NULL; 1864 } 1865 skb_dst_set(skb, dst); 1866 if (err) 1867 goto err_out; 1868 1869 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1870 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1871 dst_output); 1872 out: 1873 if (!err) { 1874 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1875 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1876 } else { 1877 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1878 } 1879 1880 rcu_read_unlock(); 1881 return; 1882 1883 err_out: 1884 kfree_skb(skb); 1885 goto out; 1886 } 1887 1888 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1889 { 1890 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1891 } 1892 1893 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1894 int type, struct mld2_grec **ppgr, unsigned int mtu) 1895 { 1896 struct mld2_report *pmr; 1897 struct mld2_grec *pgr; 1898 1899 if (!skb) { 1900 skb = mld_newpack(pmc->idev, mtu); 1901 if (!skb) 1902 return NULL; 1903 } 1904 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1905 pgr->grec_type = type; 1906 pgr->grec_auxwords = 0; 1907 pgr->grec_nsrcs = 0; 1908 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1909 pmr = (struct mld2_report *)skb_transport_header(skb); 1910 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1911 *ppgr = pgr; 1912 return skb; 1913 } 1914 1915 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1916 1917 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1918 int type, int gdeleted, int sdeleted, 1919 int crsend) 1920 { 1921 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1922 int scount, stotal, first, isquery, truncate; 1923 struct ip6_sf_list __rcu **psf_list; 1924 struct inet6_dev *idev = pmc->idev; 1925 struct net_device *dev = idev->dev; 1926 struct mld2_grec *pgr = NULL; 1927 struct mld2_report *pmr; 1928 unsigned int mtu; 1929 1930 mc_assert_locked(idev); 1931 1932 if (pmc->mca_flags & MAF_NOREPORT) 1933 return skb; 1934 1935 mtu = READ_ONCE(dev->mtu); 1936 if (mtu < IPV6_MIN_MTU) 1937 return skb; 1938 1939 isquery = type == MLD2_MODE_IS_INCLUDE || 1940 type == MLD2_MODE_IS_EXCLUDE; 1941 truncate = type == MLD2_MODE_IS_EXCLUDE || 1942 type == MLD2_CHANGE_TO_EXCLUDE; 1943 1944 stotal = scount = 0; 1945 1946 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1947 1948 if (!rcu_access_pointer(*psf_list)) 1949 goto empty_source; 1950 1951 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1952 1953 /* EX and TO_EX get a fresh packet, if needed */ 1954 if (truncate) { 1955 if (pmr && pmr->mld2r_ngrec && 1956 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1957 if (skb) 1958 mld_sendpack(skb); 1959 skb = mld_newpack(idev, mtu); 1960 } 1961 } 1962 first = 1; 1963 psf_prev = NULL; 1964 for (psf = mc_dereference(*psf_list, idev); 1965 psf; 1966 psf = psf_next) { 1967 struct in6_addr *psrc; 1968 1969 psf_next = mc_dereference(psf->sf_next, idev); 1970 1971 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1972 psf_prev = psf; 1973 continue; 1974 } 1975 1976 /* Based on RFC3810 6.1. Should not send source-list change 1977 * records when there is a filter mode change. 1978 */ 1979 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1980 (!gdeleted && pmc->mca_crcount)) && 1981 (type == MLD2_ALLOW_NEW_SOURCES || 1982 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1983 goto decrease_sf_crcount; 1984 1985 /* clear marks on query responses */ 1986 if (isquery) 1987 psf->sf_gsresp = 0; 1988 1989 if (AVAILABLE(skb) < sizeof(*psrc) + 1990 first*sizeof(struct mld2_grec)) { 1991 if (truncate && !first) 1992 break; /* truncate these */ 1993 if (pgr) 1994 pgr->grec_nsrcs = htons(scount); 1995 if (skb) 1996 mld_sendpack(skb); 1997 skb = mld_newpack(idev, mtu); 1998 first = 1; 1999 scount = 0; 2000 } 2001 if (first) { 2002 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2003 first = 0; 2004 } 2005 if (!skb) 2006 return NULL; 2007 psrc = skb_put(skb, sizeof(*psrc)); 2008 *psrc = psf->sf_addr; 2009 scount++; stotal++; 2010 if ((type == MLD2_ALLOW_NEW_SOURCES || 2011 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 2012 decrease_sf_crcount: 2013 psf->sf_crcount--; 2014 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 2015 if (psf_prev) 2016 rcu_assign_pointer(psf_prev->sf_next, 2017 mc_dereference(psf->sf_next, idev)); 2018 else 2019 rcu_assign_pointer(*psf_list, 2020 mc_dereference(psf->sf_next, idev)); 2021 kfree_rcu(psf, rcu); 2022 continue; 2023 } 2024 } 2025 psf_prev = psf; 2026 } 2027 2028 empty_source: 2029 if (!stotal) { 2030 if (type == MLD2_ALLOW_NEW_SOURCES || 2031 type == MLD2_BLOCK_OLD_SOURCES) 2032 return skb; 2033 if (pmc->mca_crcount || isquery || crsend) { 2034 /* make sure we have room for group header */ 2035 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 2036 mld_sendpack(skb); 2037 skb = NULL; /* add_grhead will get a new one */ 2038 } 2039 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2040 } 2041 } 2042 if (pgr) 2043 pgr->grec_nsrcs = htons(scount); 2044 2045 if (isquery) { 2046 /* clear query state */ 2047 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 2048 } 2049 return skb; 2050 } 2051 2052 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2053 { 2054 struct sk_buff *skb = NULL; 2055 int type; 2056 2057 mc_assert_locked(idev); 2058 2059 if (!pmc) { 2060 for_each_mc_mclock(idev, pmc) { 2061 if (pmc->mca_flags & MAF_NOREPORT) 2062 continue; 2063 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2064 type = MLD2_MODE_IS_EXCLUDE; 2065 else 2066 type = MLD2_MODE_IS_INCLUDE; 2067 skb = add_grec(skb, pmc, type, 0, 0, 0); 2068 } 2069 } else { 2070 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2071 type = MLD2_MODE_IS_EXCLUDE; 2072 else 2073 type = MLD2_MODE_IS_INCLUDE; 2074 skb = add_grec(skb, pmc, type, 0, 0, 0); 2075 } 2076 if (skb) 2077 mld_sendpack(skb); 2078 } 2079 2080 /* remove zero-count source records from a source filter list */ 2081 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2082 { 2083 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2084 2085 psf_prev = NULL; 2086 for (psf = mc_dereference(*ppsf, idev); 2087 psf; 2088 psf = psf_next) { 2089 psf_next = mc_dereference(psf->sf_next, idev); 2090 if (psf->sf_crcount == 0) { 2091 if (psf_prev) 2092 rcu_assign_pointer(psf_prev->sf_next, 2093 mc_dereference(psf->sf_next, idev)); 2094 else 2095 rcu_assign_pointer(*ppsf, 2096 mc_dereference(psf->sf_next, idev)); 2097 kfree_rcu(psf, rcu); 2098 } else { 2099 psf_prev = psf; 2100 } 2101 } 2102 } 2103 2104 static void mld_send_cr(struct inet6_dev *idev) 2105 { 2106 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2107 struct sk_buff *skb = NULL; 2108 int type, dtype; 2109 2110 /* deleted MCA's */ 2111 pmc_prev = NULL; 2112 for (pmc = mc_dereference(idev->mc_tomb, idev); 2113 pmc; 2114 pmc = pmc_next) { 2115 pmc_next = mc_dereference(pmc->next, idev); 2116 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2117 type = MLD2_BLOCK_OLD_SOURCES; 2118 dtype = MLD2_BLOCK_OLD_SOURCES; 2119 skb = add_grec(skb, pmc, type, 1, 0, 0); 2120 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2121 } 2122 if (pmc->mca_crcount) { 2123 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2124 type = MLD2_CHANGE_TO_INCLUDE; 2125 skb = add_grec(skb, pmc, type, 1, 0, 0); 2126 } 2127 pmc->mca_crcount--; 2128 if (pmc->mca_crcount == 0) { 2129 mld_clear_zeros(&pmc->mca_tomb, idev); 2130 mld_clear_zeros(&pmc->mca_sources, idev); 2131 } 2132 } 2133 if (pmc->mca_crcount == 0 && 2134 !rcu_access_pointer(pmc->mca_tomb) && 2135 !rcu_access_pointer(pmc->mca_sources)) { 2136 if (pmc_prev) 2137 rcu_assign_pointer(pmc_prev->next, pmc_next); 2138 else 2139 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2140 in6_dev_put(pmc->idev); 2141 kfree_rcu(pmc, rcu); 2142 } else 2143 pmc_prev = pmc; 2144 } 2145 2146 /* change recs */ 2147 for_each_mc_mclock(idev, pmc) { 2148 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2149 type = MLD2_BLOCK_OLD_SOURCES; 2150 dtype = MLD2_ALLOW_NEW_SOURCES; 2151 } else { 2152 type = MLD2_ALLOW_NEW_SOURCES; 2153 dtype = MLD2_BLOCK_OLD_SOURCES; 2154 } 2155 skb = add_grec(skb, pmc, type, 0, 0, 0); 2156 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2157 2158 /* filter mode changes */ 2159 if (pmc->mca_crcount) { 2160 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2161 type = MLD2_CHANGE_TO_EXCLUDE; 2162 else 2163 type = MLD2_CHANGE_TO_INCLUDE; 2164 skb = add_grec(skb, pmc, type, 0, 0, 0); 2165 pmc->mca_crcount--; 2166 } 2167 } 2168 if (!skb) 2169 return; 2170 (void) mld_sendpack(skb); 2171 } 2172 2173 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2174 { 2175 const struct in6_addr *snd_addr, *saddr; 2176 int err, len, payload_len, full_len; 2177 struct in6_addr addr_buf; 2178 struct inet6_dev *idev; 2179 struct sk_buff *skb; 2180 struct mld_msg *hdr; 2181 int hlen = LL_RESERVED_SPACE(dev); 2182 int tlen = dev->needed_tailroom; 2183 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2184 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2185 IPV6_TLV_PADN, 0 }; 2186 struct dst_entry *dst; 2187 struct flowi6 fl6; 2188 struct net *net; 2189 struct sock *sk; 2190 2191 if (type == ICMPV6_MGM_REDUCTION) 2192 snd_addr = &in6addr_linklocal_allrouters; 2193 else 2194 snd_addr = addr; 2195 2196 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2197 payload_len = len + sizeof(ra); 2198 full_len = sizeof(struct ipv6hdr) + payload_len; 2199 2200 skb = alloc_skb(hlen + tlen + full_len, GFP_KERNEL); 2201 2202 rcu_read_lock(); 2203 2204 net = dev_net_rcu(dev); 2205 idev = __in6_dev_get(dev); 2206 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 2207 if (!skb) { 2208 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2209 rcu_read_unlock(); 2210 return; 2211 } 2212 sk = net->ipv6.igmp_sk; 2213 skb_set_owner_w(skb, sk); 2214 2215 skb->priority = TC_PRIO_CONTROL; 2216 skb_reserve(skb, hlen); 2217 2218 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2219 /* <draft-ietf-magma-mld-source-05.txt>: 2220 * use unspecified address as the source address 2221 * when a valid link-local address is not available. 2222 */ 2223 saddr = &in6addr_any; 2224 } else 2225 saddr = &addr_buf; 2226 2227 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2228 2229 skb_put_data(skb, ra, sizeof(ra)); 2230 2231 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2232 hdr->mld_type = type; 2233 hdr->mld_mca = *addr; 2234 2235 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2236 IPPROTO_ICMPV6, 2237 csum_partial(hdr, len, 0)); 2238 2239 icmpv6_flow_init(sk, &fl6, type, 2240 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2241 skb->dev->ifindex); 2242 dst = icmp6_dst_alloc(skb->dev, &fl6); 2243 if (IS_ERR(dst)) { 2244 err = PTR_ERR(dst); 2245 goto err_out; 2246 } 2247 2248 skb_dst_set(skb, dst); 2249 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2250 net, sk, skb, NULL, skb->dev, 2251 dst_output); 2252 out: 2253 if (!err) { 2254 ICMP6MSGOUT_INC_STATS(net, idev, type); 2255 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2256 } else 2257 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2258 2259 rcu_read_unlock(); 2260 return; 2261 2262 err_out: 2263 kfree_skb(skb); 2264 goto out; 2265 } 2266 2267 static void mld_send_initial_cr(struct inet6_dev *idev) 2268 { 2269 struct ifmcaddr6 *pmc; 2270 struct sk_buff *skb; 2271 int type; 2272 2273 mc_assert_locked(idev); 2274 2275 if (mld_in_v1_mode(idev)) 2276 return; 2277 2278 skb = NULL; 2279 for_each_mc_mclock(idev, pmc) { 2280 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2281 type = MLD2_CHANGE_TO_EXCLUDE; 2282 else 2283 type = MLD2_ALLOW_NEW_SOURCES; 2284 skb = add_grec(skb, pmc, type, 0, 0, 1); 2285 } 2286 if (skb) 2287 mld_sendpack(skb); 2288 } 2289 2290 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2291 { 2292 mutex_lock(&idev->mc_lock); 2293 idev->mc_dad_count = idev->mc_qrv; 2294 if (idev->mc_dad_count) { 2295 mld_send_initial_cr(idev); 2296 idev->mc_dad_count--; 2297 if (idev->mc_dad_count) 2298 mld_dad_start_work(idev, 2299 unsolicited_report_interval(idev)); 2300 } 2301 mutex_unlock(&idev->mc_lock); 2302 } 2303 2304 static void mld_dad_work(struct work_struct *work) 2305 { 2306 struct inet6_dev *idev = container_of(to_delayed_work(work), 2307 struct inet6_dev, 2308 mc_dad_work); 2309 mutex_lock(&idev->mc_lock); 2310 mld_send_initial_cr(idev); 2311 if (idev->mc_dad_count) { 2312 idev->mc_dad_count--; 2313 if (idev->mc_dad_count) 2314 mld_dad_start_work(idev, 2315 unsolicited_report_interval(idev)); 2316 } 2317 mutex_unlock(&idev->mc_lock); 2318 in6_dev_put(idev); 2319 } 2320 2321 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2322 const struct in6_addr *psfsrc) 2323 { 2324 struct ip6_sf_list *psf, *psf_prev; 2325 int rv = 0; 2326 2327 mc_assert_locked(pmc->idev); 2328 2329 psf_prev = NULL; 2330 for_each_psf_mclock(pmc, psf) { 2331 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2332 break; 2333 psf_prev = psf; 2334 } 2335 if (!psf || psf->sf_count[sfmode] == 0) { 2336 /* source filter not found, or count wrong => bug */ 2337 return -ESRCH; 2338 } 2339 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1); 2340 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2341 struct inet6_dev *idev = pmc->idev; 2342 2343 /* no more filters for this source */ 2344 if (psf_prev) 2345 rcu_assign_pointer(psf_prev->sf_next, 2346 mc_dereference(psf->sf_next, idev)); 2347 else 2348 rcu_assign_pointer(pmc->mca_sources, 2349 mc_dereference(psf->sf_next, idev)); 2350 2351 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2352 !mld_in_v1_mode(idev)) { 2353 psf->sf_crcount = idev->mc_qrv; 2354 rcu_assign_pointer(psf->sf_next, 2355 mc_dereference(pmc->mca_tomb, idev)); 2356 rcu_assign_pointer(pmc->mca_tomb, psf); 2357 rv = 1; 2358 } else { 2359 kfree_rcu(psf, rcu); 2360 } 2361 } 2362 return rv; 2363 } 2364 2365 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2366 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2367 int delta) 2368 { 2369 struct ifmcaddr6 *pmc; 2370 int changerec = 0; 2371 int i, err; 2372 2373 if (!idev) 2374 return -ENODEV; 2375 2376 mc_assert_locked(idev); 2377 2378 for_each_mc_mclock(idev, pmc) { 2379 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2380 break; 2381 } 2382 if (!pmc) 2383 return -ESRCH; 2384 2385 sf_markstate(pmc); 2386 if (!delta) { 2387 if (!pmc->mca_sfcount[sfmode]) 2388 return -EINVAL; 2389 2390 pmc->mca_sfcount[sfmode]--; 2391 } 2392 err = 0; 2393 for (i = 0; i < sfcount; i++) { 2394 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2395 2396 changerec |= rv > 0; 2397 if (!err && rv < 0) 2398 err = rv; 2399 } 2400 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2401 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2402 pmc->mca_sfcount[MCAST_INCLUDE]) { 2403 struct ip6_sf_list *psf; 2404 2405 /* filter mode change */ 2406 pmc->mca_sfmode = MCAST_INCLUDE; 2407 pmc->mca_crcount = idev->mc_qrv; 2408 idev->mc_ifc_count = pmc->mca_crcount; 2409 for_each_psf_mclock(pmc, psf) 2410 psf->sf_crcount = 0; 2411 mld_ifc_event(pmc->idev); 2412 } else if (sf_setstate(pmc) || changerec) { 2413 mld_ifc_event(pmc->idev); 2414 } 2415 2416 return err; 2417 } 2418 2419 /* Add multicast single-source filter to the interface list */ 2420 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2421 const struct in6_addr *psfsrc) 2422 { 2423 struct ip6_sf_list *psf, *psf_prev; 2424 2425 mc_assert_locked(pmc->idev); 2426 2427 psf_prev = NULL; 2428 for_each_psf_mclock(pmc, psf) { 2429 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2430 break; 2431 psf_prev = psf; 2432 } 2433 if (!psf) { 2434 psf = kzalloc_obj(*psf); 2435 if (!psf) 2436 return -ENOBUFS; 2437 2438 psf->sf_addr = *psfsrc; 2439 if (psf_prev) { 2440 rcu_assign_pointer(psf_prev->sf_next, psf); 2441 } else { 2442 rcu_assign_pointer(pmc->mca_sources, psf); 2443 } 2444 } 2445 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1); 2446 return 0; 2447 } 2448 2449 static void sf_markstate(struct ifmcaddr6 *pmc) 2450 { 2451 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2452 struct ip6_sf_list *psf; 2453 2454 mc_assert_locked(pmc->idev); 2455 2456 for_each_psf_mclock(pmc, psf) { 2457 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2458 psf->sf_oldin = mca_xcount == 2459 psf->sf_count[MCAST_EXCLUDE] && 2460 !psf->sf_count[MCAST_INCLUDE]; 2461 } else { 2462 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2463 } 2464 } 2465 } 2466 2467 static int sf_setstate(struct ifmcaddr6 *pmc) 2468 { 2469 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2470 struct ip6_sf_list *psf, *dpsf; 2471 int qrv = pmc->idev->mc_qrv; 2472 int new_in, rv; 2473 2474 mc_assert_locked(pmc->idev); 2475 2476 rv = 0; 2477 for_each_psf_mclock(pmc, psf) { 2478 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2479 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2480 !psf->sf_count[MCAST_INCLUDE]; 2481 } else 2482 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2483 if (new_in) { 2484 if (!psf->sf_oldin) { 2485 struct ip6_sf_list *prev = NULL; 2486 2487 for_each_psf_tomb(pmc, dpsf) { 2488 if (ipv6_addr_equal(&dpsf->sf_addr, 2489 &psf->sf_addr)) 2490 break; 2491 prev = dpsf; 2492 } 2493 if (dpsf) { 2494 if (prev) 2495 rcu_assign_pointer(prev->sf_next, 2496 mc_dereference(dpsf->sf_next, 2497 pmc->idev)); 2498 else 2499 rcu_assign_pointer(pmc->mca_tomb, 2500 mc_dereference(dpsf->sf_next, 2501 pmc->idev)); 2502 kfree_rcu(dpsf, rcu); 2503 } 2504 psf->sf_crcount = qrv; 2505 rv++; 2506 } 2507 } else if (psf->sf_oldin) { 2508 psf->sf_crcount = 0; 2509 /* 2510 * add or update "delete" records if an active filter 2511 * is now inactive 2512 */ 2513 2514 for_each_psf_tomb(pmc, dpsf) 2515 if (ipv6_addr_equal(&dpsf->sf_addr, 2516 &psf->sf_addr)) 2517 break; 2518 if (!dpsf) { 2519 dpsf = kmalloc_obj(*dpsf); 2520 if (!dpsf) 2521 continue; 2522 *dpsf = *psf; 2523 rcu_assign_pointer(dpsf->sf_next, 2524 mc_dereference(pmc->mca_tomb, pmc->idev)); 2525 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2526 } 2527 dpsf->sf_crcount = qrv; 2528 rv++; 2529 } 2530 } 2531 return rv; 2532 } 2533 2534 /* Add multicast source filter list to the interface list */ 2535 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2536 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2537 int delta) 2538 { 2539 struct ifmcaddr6 *pmc; 2540 int isexclude; 2541 int i, err; 2542 2543 if (!idev) 2544 return -ENODEV; 2545 2546 mc_assert_locked(idev); 2547 2548 for_each_mc_mclock(idev, pmc) { 2549 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2550 break; 2551 } 2552 if (!pmc) 2553 return -ESRCH; 2554 2555 sf_markstate(pmc); 2556 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2557 if (!delta) 2558 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2559 pmc->mca_sfcount[sfmode] + 1); 2560 err = 0; 2561 for (i = 0; i < sfcount; i++) { 2562 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2563 if (err) 2564 break; 2565 } 2566 if (err) { 2567 int j; 2568 2569 if (!delta) 2570 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2571 pmc->mca_sfcount[sfmode] - 1); 2572 for (j = 0; j < i; j++) 2573 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2574 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2575 struct ip6_sf_list *psf; 2576 2577 /* filter mode change */ 2578 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2579 pmc->mca_sfmode = MCAST_EXCLUDE; 2580 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2581 pmc->mca_sfmode = MCAST_INCLUDE; 2582 /* else no filters; keep old mode for reports */ 2583 2584 pmc->mca_crcount = idev->mc_qrv; 2585 idev->mc_ifc_count = pmc->mca_crcount; 2586 for_each_psf_mclock(pmc, psf) 2587 psf->sf_crcount = 0; 2588 mld_ifc_event(idev); 2589 } else if (sf_setstate(pmc)) { 2590 mld_ifc_event(idev); 2591 } 2592 return err; 2593 } 2594 2595 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2596 { 2597 struct ip6_sf_list *psf, *nextpsf; 2598 2599 mc_assert_locked(pmc->idev); 2600 2601 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2602 psf; 2603 psf = nextpsf) { 2604 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2605 kfree_rcu(psf, rcu); 2606 } 2607 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2608 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2609 psf; 2610 psf = nextpsf) { 2611 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2612 kfree_rcu(psf, rcu); 2613 } 2614 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2615 pmc->mca_sfmode = MCAST_EXCLUDE; 2616 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2617 /* Paired with the READ_ONCE() from ipv6_chk_mcast_addr() */ 2618 WRITE_ONCE(pmc->mca_sfcount[MCAST_EXCLUDE], 1); 2619 } 2620 2621 static void igmp6_join_group(struct ifmcaddr6 *ma) 2622 { 2623 unsigned long delay; 2624 2625 mc_assert_locked(ma->idev); 2626 2627 if (ma->mca_flags & MAF_NOREPORT) 2628 return; 2629 2630 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2631 2632 delay = get_random_u32_below(unsolicited_report_interval(ma->idev)); 2633 2634 if (cancel_delayed_work(&ma->mca_work)) { 2635 refcount_dec(&ma->mca_refcnt); 2636 delay = ma->mca_work.timer.expires - jiffies; 2637 } 2638 2639 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2640 refcount_inc(&ma->mca_refcnt); 2641 WRITE_ONCE(ma->mca_flags, ma->mca_flags | 2642 MAF_TIMER_RUNNING | MAF_LAST_REPORTER); 2643 } 2644 2645 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2646 struct inet6_dev *idev) 2647 { 2648 struct ip6_sf_socklist *psl; 2649 int err; 2650 2651 psl = sock_dereference(iml->sflist, sk); 2652 2653 if (idev) 2654 mutex_lock(&idev->mc_lock); 2655 2656 if (!psl) { 2657 /* any-source empty exclude case */ 2658 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2659 } else { 2660 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2661 psl->sl_count, psl->sl_addr, 0); 2662 RCU_INIT_POINTER(iml->sflist, NULL); 2663 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2664 &sk->sk_omem_alloc); 2665 kfree_rcu(psl, rcu); 2666 } 2667 2668 if (idev) 2669 mutex_unlock(&idev->mc_lock); 2670 2671 return err; 2672 } 2673 2674 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2675 { 2676 mc_assert_locked(ma->idev); 2677 2678 if (mld_in_v1_mode(ma->idev)) { 2679 if (ma->mca_flags & MAF_LAST_REPORTER) { 2680 igmp6_send(&ma->mca_addr, ma->idev->dev, 2681 ICMPV6_MGM_REDUCTION); 2682 } 2683 } else { 2684 mld_add_delrec(ma->idev, ma); 2685 mld_ifc_event(ma->idev); 2686 } 2687 } 2688 2689 static void mld_gq_work(struct work_struct *work) 2690 { 2691 struct inet6_dev *idev = container_of(to_delayed_work(work), 2692 struct inet6_dev, 2693 mc_gq_work); 2694 2695 mutex_lock(&idev->mc_lock); 2696 mld_send_report(idev, NULL); 2697 idev->mc_gq_running = 0; 2698 mutex_unlock(&idev->mc_lock); 2699 2700 in6_dev_put(idev); 2701 } 2702 2703 static void mld_ifc_work(struct work_struct *work) 2704 { 2705 struct inet6_dev *idev = container_of(to_delayed_work(work), 2706 struct inet6_dev, 2707 mc_ifc_work); 2708 2709 mutex_lock(&idev->mc_lock); 2710 mld_send_cr(idev); 2711 2712 if (idev->mc_ifc_count) { 2713 idev->mc_ifc_count--; 2714 if (idev->mc_ifc_count) 2715 mld_ifc_start_work(idev, 2716 unsolicited_report_interval(idev)); 2717 } 2718 mutex_unlock(&idev->mc_lock); 2719 in6_dev_put(idev); 2720 } 2721 2722 static void mld_ifc_event(struct inet6_dev *idev) 2723 { 2724 mc_assert_locked(idev); 2725 2726 if (mld_in_v1_mode(idev)) 2727 return; 2728 2729 idev->mc_ifc_count = idev->mc_qrv; 2730 mld_ifc_start_work(idev, 1); 2731 } 2732 2733 static void mld_mca_work(struct work_struct *work) 2734 { 2735 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2736 struct ifmcaddr6, mca_work); 2737 2738 mutex_lock(&ma->idev->mc_lock); 2739 if (mld_in_v1_mode(ma->idev)) 2740 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2741 else 2742 mld_send_report(ma->idev, ma); 2743 WRITE_ONCE(ma->mca_flags, (ma->mca_flags | MAF_LAST_REPORTER) & 2744 ~MAF_TIMER_RUNNING); 2745 mutex_unlock(&ma->idev->mc_lock); 2746 2747 ma_put(ma); 2748 } 2749 2750 /* Device changing type */ 2751 2752 void ipv6_mc_unmap(struct inet6_dev *idev) 2753 { 2754 struct ifmcaddr6 *i; 2755 2756 /* Install multicast list, except for all-nodes (already installed) */ 2757 2758 mutex_lock(&idev->mc_lock); 2759 for_each_mc_mclock(idev, i) 2760 igmp6_group_dropped(i); 2761 mutex_unlock(&idev->mc_lock); 2762 } 2763 2764 void ipv6_mc_remap(struct inet6_dev *idev) 2765 { 2766 ipv6_mc_up(idev); 2767 } 2768 2769 /* Device going down */ 2770 void ipv6_mc_down(struct inet6_dev *idev) 2771 { 2772 struct ifmcaddr6 *i; 2773 2774 mutex_lock(&idev->mc_lock); 2775 /* Withdraw multicast list */ 2776 for_each_mc_mclock(idev, i) 2777 igmp6_group_dropped(i); 2778 mutex_unlock(&idev->mc_lock); 2779 2780 /* Should stop work after group drop. or we will 2781 * start work again in mld_ifc_event() 2782 */ 2783 mld_query_stop_work(idev); 2784 mld_report_stop_work(idev); 2785 2786 mutex_lock(&idev->mc_lock); 2787 mld_ifc_stop_work(idev); 2788 mld_gq_stop_work(idev); 2789 mutex_unlock(&idev->mc_lock); 2790 2791 mld_dad_stop_work(idev); 2792 } 2793 2794 static void ipv6_mc_reset(struct inet6_dev *idev) 2795 { 2796 idev->mc_qrv = sysctl_mld_qrv; 2797 idev->mc_qi = MLD_QI_DEFAULT; 2798 idev->mc_qri = MLD_QRI_DEFAULT; 2799 idev->mc_v1_seen = 0; 2800 idev->mc_maxdelay = unsolicited_report_interval(idev); 2801 } 2802 2803 /* Device going up */ 2804 2805 void ipv6_mc_up(struct inet6_dev *idev) 2806 { 2807 struct ifmcaddr6 *i; 2808 2809 /* Install multicast list, except for all-nodes (already installed) */ 2810 2811 ipv6_mc_reset(idev); 2812 mutex_lock(&idev->mc_lock); 2813 for_each_mc_mclock(idev, i) { 2814 mld_del_delrec(idev, i); 2815 igmp6_group_added(i); 2816 } 2817 mutex_unlock(&idev->mc_lock); 2818 } 2819 2820 /* IPv6 device initialization. */ 2821 2822 void ipv6_mc_init_dev(struct inet6_dev *idev) 2823 { 2824 idev->mc_gq_running = 0; 2825 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2826 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2827 idev->mc_ifc_count = 0; 2828 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2829 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2830 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2831 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2832 skb_queue_head_init(&idev->mc_query_queue); 2833 skb_queue_head_init(&idev->mc_report_queue); 2834 spin_lock_init(&idev->mc_query_lock); 2835 spin_lock_init(&idev->mc_report_lock); 2836 mutex_init(&idev->mc_lock); 2837 ipv6_mc_reset(idev); 2838 } 2839 2840 /* 2841 * Device is about to be destroyed: clean up. 2842 */ 2843 2844 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2845 { 2846 struct ifmcaddr6 *i; 2847 2848 /* Deactivate works */ 2849 ipv6_mc_down(idev); 2850 mutex_lock(&idev->mc_lock); 2851 mld_clear_delrec(idev); 2852 mutex_unlock(&idev->mc_lock); 2853 mld_clear_query(idev); 2854 mld_clear_report(idev); 2855 2856 /* Delete all-nodes address. */ 2857 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2858 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2859 * fail. 2860 */ 2861 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2862 2863 if (idev->cnf.forwarding) 2864 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2865 2866 mutex_lock(&idev->mc_lock); 2867 while ((i = mc_dereference(idev->mc_list, idev))) { 2868 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2869 2870 ip6_mc_clear_src(i); 2871 ma_put(i); 2872 } 2873 mutex_unlock(&idev->mc_lock); 2874 } 2875 2876 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2877 { 2878 struct ifmcaddr6 *pmc; 2879 2880 mutex_lock(&idev->mc_lock); 2881 if (mld_in_v1_mode(idev)) { 2882 for_each_mc_mclock(idev, pmc) 2883 igmp6_join_group(pmc); 2884 } else { 2885 mld_send_report(idev, NULL); 2886 } 2887 mutex_unlock(&idev->mc_lock); 2888 } 2889 2890 static int ipv6_mc_netdev_event(struct notifier_block *this, 2891 unsigned long event, 2892 void *ptr) 2893 { 2894 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2895 struct inet6_dev *idev = __in6_dev_get(dev); 2896 2897 switch (event) { 2898 case NETDEV_RESEND_IGMP: 2899 if (idev) 2900 ipv6_mc_rejoin_groups(idev); 2901 break; 2902 default: 2903 break; 2904 } 2905 2906 return NOTIFY_DONE; 2907 } 2908 2909 static struct notifier_block igmp6_netdev_notifier = { 2910 .notifier_call = ipv6_mc_netdev_event, 2911 }; 2912 2913 #ifdef CONFIG_PROC_FS 2914 struct igmp6_mc_iter_state { 2915 struct seq_net_private p; 2916 struct net_device *dev; 2917 struct inet6_dev *idev; 2918 }; 2919 2920 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2921 2922 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2923 { 2924 struct ifmcaddr6 *im = NULL; 2925 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2926 struct net *net = seq_file_net(seq); 2927 2928 state->idev = NULL; 2929 for_each_netdev_rcu(net, state->dev) { 2930 struct inet6_dev *idev; 2931 idev = __in6_dev_get(state->dev); 2932 if (!idev) 2933 continue; 2934 2935 im = rcu_dereference(idev->mc_list); 2936 if (im) { 2937 state->idev = idev; 2938 break; 2939 } 2940 } 2941 return im; 2942 } 2943 2944 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2945 { 2946 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2947 2948 im = rcu_dereference(im->next); 2949 while (!im) { 2950 state->dev = next_net_device_rcu(state->dev); 2951 if (!state->dev) { 2952 state->idev = NULL; 2953 break; 2954 } 2955 state->idev = __in6_dev_get(state->dev); 2956 if (!state->idev) 2957 continue; 2958 im = rcu_dereference(state->idev->mc_list); 2959 } 2960 return im; 2961 } 2962 2963 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2964 { 2965 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2966 if (im) 2967 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2968 --pos; 2969 return pos ? NULL : im; 2970 } 2971 2972 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2973 __acquires(RCU) 2974 { 2975 rcu_read_lock(); 2976 return igmp6_mc_get_idx(seq, *pos); 2977 } 2978 2979 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2980 { 2981 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2982 2983 ++*pos; 2984 return im; 2985 } 2986 2987 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2988 __releases(RCU) 2989 { 2990 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2991 2992 if (likely(state->idev)) 2993 state->idev = NULL; 2994 state->dev = NULL; 2995 rcu_read_unlock(); 2996 } 2997 2998 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2999 { 3000 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 3001 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 3002 unsigned int mca_flags = READ_ONCE(im->mca_flags); 3003 unsigned long expires = READ_ONCE(im->mca_work.timer.expires); 3004 3005 seq_printf(seq, 3006 "%-4d %-15s %pi6 %5d %08X %ld\n", 3007 state->dev->ifindex, state->dev->name, 3008 &im->mca_addr, 3009 READ_ONCE(im->mca_users), mca_flags, 3010 (mca_flags & MAF_TIMER_RUNNING) ? 3011 jiffies_to_clock_t(expires - jiffies) : 0); 3012 return 0; 3013 } 3014 3015 static const struct seq_operations igmp6_mc_seq_ops = { 3016 .start = igmp6_mc_seq_start, 3017 .next = igmp6_mc_seq_next, 3018 .stop = igmp6_mc_seq_stop, 3019 .show = igmp6_mc_seq_show, 3020 }; 3021 3022 struct igmp6_mcf_iter_state { 3023 struct seq_net_private p; 3024 struct net_device *dev; 3025 struct inet6_dev *idev; 3026 struct ifmcaddr6 *im; 3027 }; 3028 3029 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 3030 3031 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 3032 { 3033 struct ip6_sf_list *psf = NULL; 3034 struct ifmcaddr6 *im = NULL; 3035 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3036 struct net *net = seq_file_net(seq); 3037 3038 state->idev = NULL; 3039 state->im = NULL; 3040 for_each_netdev_rcu(net, state->dev) { 3041 struct inet6_dev *idev; 3042 idev = __in6_dev_get(state->dev); 3043 if (unlikely(idev == NULL)) 3044 continue; 3045 3046 im = rcu_dereference(idev->mc_list); 3047 if (likely(im)) { 3048 psf = rcu_dereference(im->mca_sources); 3049 if (likely(psf)) { 3050 state->im = im; 3051 state->idev = idev; 3052 break; 3053 } 3054 } 3055 } 3056 return psf; 3057 } 3058 3059 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3060 { 3061 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3062 3063 psf = rcu_dereference(psf->sf_next); 3064 while (!psf) { 3065 state->im = rcu_dereference(state->im->next); 3066 while (!state->im) { 3067 state->dev = next_net_device_rcu(state->dev); 3068 if (!state->dev) { 3069 state->idev = NULL; 3070 goto out; 3071 } 3072 state->idev = __in6_dev_get(state->dev); 3073 if (!state->idev) 3074 continue; 3075 state->im = rcu_dereference(state->idev->mc_list); 3076 } 3077 psf = rcu_dereference(state->im->mca_sources); 3078 } 3079 out: 3080 return psf; 3081 } 3082 3083 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3084 { 3085 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3086 if (psf) 3087 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3088 --pos; 3089 return pos ? NULL : psf; 3090 } 3091 3092 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3093 __acquires(RCU) 3094 { 3095 rcu_read_lock(); 3096 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3097 } 3098 3099 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3100 { 3101 struct ip6_sf_list *psf; 3102 if (v == SEQ_START_TOKEN) 3103 psf = igmp6_mcf_get_first(seq); 3104 else 3105 psf = igmp6_mcf_get_next(seq, v); 3106 ++*pos; 3107 return psf; 3108 } 3109 3110 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3111 __releases(RCU) 3112 { 3113 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3114 3115 if (likely(state->im)) 3116 state->im = NULL; 3117 if (likely(state->idev)) 3118 state->idev = NULL; 3119 3120 state->dev = NULL; 3121 rcu_read_unlock(); 3122 } 3123 3124 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3125 { 3126 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3127 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3128 3129 if (v == SEQ_START_TOKEN) { 3130 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3131 } else { 3132 seq_printf(seq, 3133 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3134 state->dev->ifindex, state->dev->name, 3135 &state->im->mca_addr, 3136 &psf->sf_addr, 3137 READ_ONCE(psf->sf_count[MCAST_INCLUDE]), 3138 READ_ONCE(psf->sf_count[MCAST_EXCLUDE])); 3139 } 3140 return 0; 3141 } 3142 3143 static const struct seq_operations igmp6_mcf_seq_ops = { 3144 .start = igmp6_mcf_seq_start, 3145 .next = igmp6_mcf_seq_next, 3146 .stop = igmp6_mcf_seq_stop, 3147 .show = igmp6_mcf_seq_show, 3148 }; 3149 3150 static int __net_init igmp6_proc_init(struct net *net) 3151 { 3152 int err; 3153 3154 err = -ENOMEM; 3155 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3156 sizeof(struct igmp6_mc_iter_state))) 3157 goto out; 3158 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3159 &igmp6_mcf_seq_ops, 3160 sizeof(struct igmp6_mcf_iter_state))) 3161 goto out_proc_net_igmp6; 3162 3163 err = 0; 3164 out: 3165 return err; 3166 3167 out_proc_net_igmp6: 3168 remove_proc_entry("igmp6", net->proc_net); 3169 goto out; 3170 } 3171 3172 static void __net_exit igmp6_proc_exit(struct net *net) 3173 { 3174 remove_proc_entry("mcfilter6", net->proc_net); 3175 remove_proc_entry("igmp6", net->proc_net); 3176 } 3177 #else 3178 static inline int igmp6_proc_init(struct net *net) 3179 { 3180 return 0; 3181 } 3182 static inline void igmp6_proc_exit(struct net *net) 3183 { 3184 } 3185 #endif 3186 3187 static int __net_init igmp6_net_init(struct net *net) 3188 { 3189 int err; 3190 3191 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3192 SOCK_RAW, IPPROTO_ICMPV6, net); 3193 if (err < 0) { 3194 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3195 err); 3196 goto out; 3197 } 3198 3199 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3200 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3201 3202 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3203 SOCK_RAW, IPPROTO_ICMPV6, net); 3204 if (err < 0) { 3205 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3206 err); 3207 goto out_sock_create; 3208 } 3209 3210 err = igmp6_proc_init(net); 3211 if (err) 3212 goto out_sock_create_autojoin; 3213 3214 return 0; 3215 3216 out_sock_create_autojoin: 3217 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3218 out_sock_create: 3219 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3220 out: 3221 return err; 3222 } 3223 3224 static void __net_exit igmp6_net_exit(struct net *net) 3225 { 3226 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3227 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3228 igmp6_proc_exit(net); 3229 } 3230 3231 static struct pernet_operations igmp6_net_ops = { 3232 .init = igmp6_net_init, 3233 .exit = igmp6_net_exit, 3234 }; 3235 3236 int __init igmp6_init(void) 3237 { 3238 int err; 3239 3240 err = register_pernet_subsys(&igmp6_net_ops); 3241 if (err) 3242 return err; 3243 3244 mld_wq = create_workqueue("mld"); 3245 if (!mld_wq) { 3246 unregister_pernet_subsys(&igmp6_net_ops); 3247 return -ENOMEM; 3248 } 3249 3250 return err; 3251 } 3252 3253 int __init igmp6_late_init(void) 3254 { 3255 return register_netdevice_notifier(&igmp6_netdev_notifier); 3256 } 3257 3258 void igmp6_cleanup(void) 3259 { 3260 unregister_pernet_subsys(&igmp6_net_ops); 3261 destroy_workqueue(mld_wq); 3262 } 3263 3264 void igmp6_late_cleanup(void) 3265 { 3266 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3267 } 3268