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(u32)) + 912 nla_total_size(sizeof(struct ifa_cacheinfo)), 913 GFP_KERNEL); 914 if (!skb) 915 goto error; 916 917 err = inet6_fill_ifmcaddr(skb, ifmca, &fillargs); 918 if (err < 0) { 919 WARN_ON_ONCE(err == -EMSGSIZE); 920 nlmsg_free(skb); 921 goto error; 922 } 923 924 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MCADDR, NULL, GFP_KERNEL); 925 return; 926 error: 927 rtnl_set_sk_err(net, RTNLGRP_IPV6_MCADDR, err); 928 } 929 930 /* 931 * device multicast group inc (add if not found) 932 */ 933 static int __ipv6_dev_mc_inc(struct net_device *dev, 934 const struct in6_addr *addr, unsigned int mode) 935 { 936 struct inet6_dev *idev; 937 struct ifmcaddr6 *mc; 938 939 /* we need to take a reference on idev */ 940 idev = in6_dev_get(dev); 941 if (!idev) 942 return -EINVAL; 943 944 mutex_lock(&idev->mc_lock); 945 946 if (READ_ONCE(idev->dead)) { 947 mutex_unlock(&idev->mc_lock); 948 in6_dev_put(idev); 949 return -ENODEV; 950 } 951 952 for_each_mc_mclock(idev, mc) { 953 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 954 WRITE_ONCE(mc->mca_users, mc->mca_users + 1); 955 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 956 mutex_unlock(&idev->mc_lock); 957 in6_dev_put(idev); 958 return 0; 959 } 960 } 961 962 mc = mca_alloc(idev, addr, mode); 963 if (!mc) { 964 mutex_unlock(&idev->mc_lock); 965 in6_dev_put(idev); 966 return -ENOMEM; 967 } 968 969 rcu_assign_pointer(mc->next, idev->mc_list); 970 rcu_assign_pointer(idev->mc_list, mc); 971 972 mld_del_delrec(idev, mc); 973 igmp6_group_added(mc); 974 inet6_ifmcaddr_notify(dev, mc, RTM_NEWMULTICAST); 975 mutex_unlock(&idev->mc_lock); 976 977 return 0; 978 } 979 980 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 981 { 982 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 983 } 984 EXPORT_SYMBOL(ipv6_dev_mc_inc); 985 986 /* 987 * device multicast group del 988 */ 989 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 990 { 991 struct ifmcaddr6 *ma, __rcu **map; 992 993 mutex_lock(&idev->mc_lock); 994 995 for (map = &idev->mc_list; 996 (ma = mc_dereference(*map, idev)); 997 map = &ma->next) { 998 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 999 int new_users = ma->mca_users - 1; 1000 1001 WRITE_ONCE(ma->mca_users, new_users); 1002 if (new_users == 0) { 1003 *map = ma->next; 1004 1005 igmp6_group_dropped(ma); 1006 inet6_ifmcaddr_notify(idev->dev, ma, 1007 RTM_DELMULTICAST); 1008 ip6_mc_clear_src(ma); 1009 mutex_unlock(&idev->mc_lock); 1010 1011 ma_put(ma); 1012 return 0; 1013 } 1014 mutex_unlock(&idev->mc_lock); 1015 return 0; 1016 } 1017 } 1018 1019 mutex_unlock(&idev->mc_lock); 1020 return -ENOENT; 1021 } 1022 1023 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 1024 { 1025 struct inet6_dev *idev; 1026 int err; 1027 1028 idev = in6_dev_get(dev); 1029 if (!idev) 1030 return -ENODEV; 1031 1032 err = __ipv6_dev_mc_dec(idev, addr); 1033 in6_dev_put(idev); 1034 1035 return err; 1036 } 1037 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1038 1039 /* 1040 * check if the interface/address pair is valid 1041 */ 1042 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1043 const struct in6_addr *src_addr) 1044 { 1045 struct inet6_dev *idev; 1046 struct ifmcaddr6 *mc; 1047 bool rv = false; 1048 1049 rcu_read_lock(); 1050 idev = __in6_dev_get(dev); 1051 if (!idev) 1052 goto unlock; 1053 for_each_mc_rcu(idev, mc) { 1054 if (ipv6_addr_equal(&mc->mca_addr, group)) 1055 break; 1056 } 1057 if (!mc) 1058 goto unlock; 1059 if (src_addr && !ipv6_addr_any(src_addr)) { 1060 struct ip6_sf_list *psf; 1061 1062 for_each_psf_rcu(mc, psf) { 1063 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1064 break; 1065 } 1066 if (psf) 1067 rv = READ_ONCE(psf->sf_count[MCAST_INCLUDE]) || 1068 READ_ONCE(psf->sf_count[MCAST_EXCLUDE]) != 1069 READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]); 1070 else 1071 rv = READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]) != 0; 1072 } else { 1073 rv = true; /* don't filter unspecified source */ 1074 } 1075 unlock: 1076 rcu_read_unlock(); 1077 return rv; 1078 } 1079 1080 static void mld_gq_start_work(struct inet6_dev *idev) 1081 { 1082 unsigned long tv = get_random_u32_below(idev->mc_maxdelay); 1083 1084 mc_assert_locked(idev); 1085 1086 idev->mc_gq_running = 1; 1087 if (in6_dev_hold_safe(idev)) { 1088 if (mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1089 in6_dev_put(idev); 1090 } 1091 } 1092 1093 static void mld_gq_stop_work(struct inet6_dev *idev) 1094 { 1095 mc_assert_locked(idev); 1096 1097 idev->mc_gq_running = 0; 1098 if (cancel_delayed_work(&idev->mc_gq_work)) 1099 __in6_dev_put(idev); 1100 } 1101 1102 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1103 { 1104 unsigned long tv = get_random_u32_below(delay); 1105 1106 mc_assert_locked(idev); 1107 1108 if (in6_dev_hold_safe(idev)) { 1109 if (mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1110 in6_dev_put(idev); 1111 } 1112 } 1113 1114 static void mld_ifc_stop_work(struct inet6_dev *idev) 1115 { 1116 mc_assert_locked(idev); 1117 1118 idev->mc_ifc_count = 0; 1119 if (cancel_delayed_work(&idev->mc_ifc_work)) 1120 __in6_dev_put(idev); 1121 } 1122 1123 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1124 { 1125 unsigned long tv = get_random_u32_below(delay); 1126 1127 mc_assert_locked(idev); 1128 1129 if (in6_dev_hold_safe(idev)) { 1130 if (mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1131 in6_dev_put(idev); 1132 } 1133 } 1134 1135 static void mld_dad_stop_work(struct inet6_dev *idev) 1136 { 1137 if (cancel_delayed_work(&idev->mc_dad_work)) 1138 __in6_dev_put(idev); 1139 } 1140 1141 static void mld_query_stop_work(struct inet6_dev *idev) 1142 { 1143 spin_lock_bh(&idev->mc_query_lock); 1144 if (cancel_delayed_work(&idev->mc_query_work)) 1145 __in6_dev_put(idev); 1146 spin_unlock_bh(&idev->mc_query_lock); 1147 } 1148 1149 static void mld_report_stop_work(struct inet6_dev *idev) 1150 { 1151 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1152 __in6_dev_put(idev); 1153 } 1154 1155 /* IGMP handling (alias multicast ICMPv6 messages) */ 1156 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1157 { 1158 unsigned long delay = resptime; 1159 1160 mc_assert_locked(ma->idev); 1161 1162 /* Do not start work for these addresses */ 1163 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1164 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1165 return; 1166 1167 if (cancel_delayed_work(&ma->mca_work)) { 1168 refcount_dec(&ma->mca_refcnt); 1169 delay = ma->mca_work.timer.expires - jiffies; 1170 } 1171 1172 if (delay >= resptime) 1173 delay = get_random_u32_below(resptime); 1174 1175 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1176 refcount_inc(&ma->mca_refcnt); 1177 WRITE_ONCE(ma->mca_flags, ma->mca_flags | MAF_TIMER_RUNNING); 1178 } 1179 1180 /* mark EXCLUDE-mode sources */ 1181 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1182 const struct in6_addr *srcs) 1183 { 1184 struct ip6_sf_list *psf; 1185 int i, scount; 1186 1187 mc_assert_locked(pmc->idev); 1188 1189 scount = 0; 1190 for_each_psf_mclock(pmc, psf) { 1191 if (scount == nsrcs) 1192 break; 1193 for (i = 0; i < nsrcs; i++) { 1194 /* skip inactive filters */ 1195 if (psf->sf_count[MCAST_INCLUDE] || 1196 pmc->mca_sfcount[MCAST_EXCLUDE] != 1197 psf->sf_count[MCAST_EXCLUDE]) 1198 break; 1199 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1200 scount++; 1201 break; 1202 } 1203 } 1204 } 1205 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 1206 if (scount == nsrcs) /* all sources excluded */ 1207 return false; 1208 return true; 1209 } 1210 1211 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1212 const struct in6_addr *srcs) 1213 { 1214 struct ip6_sf_list *psf; 1215 int i, scount; 1216 1217 mc_assert_locked(pmc->idev); 1218 1219 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1220 return mld_xmarksources(pmc, nsrcs, srcs); 1221 1222 /* mark INCLUDE-mode sources */ 1223 1224 scount = 0; 1225 for_each_psf_mclock(pmc, psf) { 1226 if (scount == nsrcs) 1227 break; 1228 for (i = 0; i < nsrcs; i++) { 1229 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1230 psf->sf_gsresp = 1; 1231 scount++; 1232 break; 1233 } 1234 } 1235 } 1236 if (!scount) { 1237 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 1238 return false; 1239 } 1240 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags | MAF_GSQUERY); 1241 return true; 1242 } 1243 1244 static int mld_force_mld_version(const struct inet6_dev *idev) 1245 { 1246 const struct net *net = dev_net(idev->dev); 1247 int all_force; 1248 1249 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1250 /* Normally, both are 0 here. If enforcement to a particular is 1251 * being used, individual device enforcement will have a lower 1252 * precedence over 'all' device (.../conf/all/force_mld_version). 1253 */ 1254 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1255 } 1256 1257 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1258 { 1259 return mld_force_mld_version(idev) == 2; 1260 } 1261 1262 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1263 { 1264 return mld_force_mld_version(idev) == 1; 1265 } 1266 1267 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1268 { 1269 if (mld_in_v2_mode_only(idev)) 1270 return false; 1271 if (mld_in_v1_mode_only(idev)) 1272 return true; 1273 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1274 return true; 1275 1276 return false; 1277 } 1278 1279 static void mld_set_v1_mode(struct inet6_dev *idev) 1280 { 1281 /* RFC3810, relevant sections: 1282 * - 9.1. Robustness Variable 1283 * - 9.2. Query Interval 1284 * - 9.3. Query Response Interval 1285 * - 9.12. Older Version Querier Present Timeout 1286 */ 1287 unsigned long switchback; 1288 1289 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1290 1291 idev->mc_v1_seen = jiffies + switchback; 1292 } 1293 1294 static void mld_update_qrv(struct inet6_dev *idev, 1295 const struct mld2_query *mlh2) 1296 { 1297 /* RFC3810, relevant sections: 1298 * - 5.1.8. QRV (Querier's Robustness Variable) 1299 * - 9.1. Robustness Variable 1300 */ 1301 1302 /* The value of the Robustness Variable MUST NOT be zero, 1303 * and SHOULD NOT be one. Catch this here if we ever run 1304 * into such a case in future. 1305 */ 1306 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1307 WARN_ON(idev->mc_qrv == 0); 1308 1309 if (mlh2->mld2q_qrv > 0) 1310 idev->mc_qrv = mlh2->mld2q_qrv; 1311 1312 if (unlikely(idev->mc_qrv < min_qrv)) { 1313 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1314 idev->mc_qrv, min_qrv); 1315 idev->mc_qrv = min_qrv; 1316 } 1317 } 1318 1319 static void mld_update_qi(struct inet6_dev *idev, 1320 const struct mld2_query *mlh2) 1321 { 1322 /* RFC3810, relevant sections: 1323 * - 5.1.9. QQIC (Querier's Query Interval Code) 1324 * - 9.2. Query Interval 1325 * - 9.12. Older Version Querier Present Timeout 1326 * (the [Query Interval] in the last Query received) 1327 */ 1328 idev->mc_qi = mldv2_qqi(mlh2) * HZ; 1329 } 1330 1331 static void mld_update_qri(struct inet6_dev *idev, 1332 const struct mld2_query *mlh2) 1333 { 1334 /* RFC3810, relevant sections: 1335 * - 5.1.3. Maximum Response Code 1336 * - 9.3. Query Response Interval 1337 */ 1338 idev->mc_qri = msecs_to_jiffies(mldv2_mrd(mlh2)); 1339 } 1340 1341 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1342 unsigned long *max_delay, bool v1_query) 1343 { 1344 unsigned long mldv1_md; 1345 1346 /* Ignore v1 queries */ 1347 if (mld_in_v2_mode_only(idev)) 1348 return -EINVAL; 1349 1350 mldv1_md = ntohs(mld->mld_maxdelay); 1351 1352 /* When in MLDv1 fallback and a MLDv2 router start-up being 1353 * unaware of current MLDv1 operation, the MRC == MRD mapping 1354 * only works when the exponential algorithm is not being 1355 * used (as MLDv1 is unaware of such things). 1356 * 1357 * According to the RFC author, the MLDv2 implementations 1358 * he's aware of all use a MRC < 32768 on start up queries. 1359 * 1360 * Thus, should we *ever* encounter something else larger 1361 * than that, just assume the maximum possible within our 1362 * reach. 1363 */ 1364 if (!v1_query) 1365 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1366 1367 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1368 1369 /* MLDv1 router present: we need to go into v1 mode *only* 1370 * when an MLDv1 query is received as per section 9.12. of 1371 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1372 * queries MUST be of exactly 24 octets. 1373 */ 1374 if (v1_query) 1375 mld_set_v1_mode(idev); 1376 1377 /* cancel MLDv2 report work */ 1378 mld_gq_stop_work(idev); 1379 /* cancel the interface change work */ 1380 mld_ifc_stop_work(idev); 1381 /* clear deleted report items */ 1382 mld_clear_delrec(idev); 1383 1384 return 0; 1385 } 1386 1387 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1388 unsigned long *max_delay) 1389 { 1390 *max_delay = max(msecs_to_jiffies(mldv2_mrd(mld)), 1UL); 1391 1392 mld_update_qrv(idev, mld); 1393 mld_update_qi(idev, mld); 1394 mld_update_qri(idev, mld); 1395 1396 idev->mc_maxdelay = *max_delay; 1397 1398 return; 1399 } 1400 1401 /* called with rcu_read_lock() */ 1402 void igmp6_event_query(struct sk_buff *skb) 1403 { 1404 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1405 bool put = false; 1406 1407 if (!idev || idev->dead) 1408 goto out; 1409 1410 spin_lock_bh(&idev->mc_query_lock); 1411 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS && 1412 in6_dev_hold_safe(idev)) { 1413 __skb_queue_tail(&idev->mc_query_queue, skb); 1414 if (mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1415 put = true; 1416 skb = NULL; 1417 } 1418 spin_unlock_bh(&idev->mc_query_lock); 1419 1420 if (put) 1421 in6_dev_put(idev); 1422 out: 1423 kfree_skb(skb); 1424 } 1425 1426 static void __mld_query_work(struct sk_buff *skb) 1427 { 1428 struct mld2_query *mlh2 = NULL; 1429 unsigned long max_delay; 1430 struct inet6_dev *idev; 1431 struct in6_addr group; 1432 struct ifmcaddr6 *ma; 1433 struct mld_msg *mld; 1434 int group_type; 1435 int mark = 0; 1436 int len, err; 1437 1438 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1439 goto kfree_skb; 1440 1441 /* compute payload length excluding extension headers */ 1442 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1443 len -= skb_network_header_len(skb); 1444 1445 /* RFC3810 6.2 1446 * Upon reception of an MLD message that contains a Query, the node 1447 * checks if the source address of the message is a valid link-local 1448 * address, if the Hop Limit is set to 1, and if the Router Alert 1449 * option is present in the Hop-By-Hop Options header of the IPv6 1450 * packet. If any of these checks fails, the packet is dropped. 1451 */ 1452 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1453 ipv6_hdr(skb)->hop_limit != 1 || 1454 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1455 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1456 goto kfree_skb; 1457 1458 idev = in6_dev_get(skb->dev); 1459 if (!idev) 1460 goto kfree_skb; 1461 1462 mld = (struct mld_msg *)icmp6_hdr(skb); 1463 group = mld->mld_mca; 1464 group_type = ipv6_addr_type(&group); 1465 1466 if (group_type != IPV6_ADDR_ANY && 1467 !(group_type&IPV6_ADDR_MULTICAST)) 1468 goto out; 1469 1470 if (len < MLD_V1_QUERY_LEN) { 1471 goto out; 1472 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1473 err = mld_process_v1(idev, mld, &max_delay, 1474 len == MLD_V1_QUERY_LEN); 1475 if (err < 0) 1476 goto out; 1477 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1478 int srcs_offset = sizeof(struct mld2_query) - 1479 sizeof(struct icmp6hdr); 1480 1481 if (!pskb_may_pull(skb, srcs_offset)) 1482 goto out; 1483 1484 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1485 1486 mld_process_v2(idev, mlh2, &max_delay); 1487 1488 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1489 if (mlh2->mld2q_nsrcs) 1490 goto out; /* no sources allowed */ 1491 1492 mld_gq_start_work(idev); 1493 goto out; 1494 } 1495 /* mark sources to include, if group & source-specific */ 1496 if (mlh2->mld2q_nsrcs != 0) { 1497 if (!pskb_may_pull(skb, srcs_offset + 1498 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1499 goto out; 1500 1501 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1502 mark = 1; 1503 } 1504 } else { 1505 goto out; 1506 } 1507 1508 if (group_type == IPV6_ADDR_ANY) { 1509 for_each_mc_mclock(idev, ma) { 1510 igmp6_group_queried(ma, max_delay); 1511 } 1512 } else { 1513 for_each_mc_mclock(idev, ma) { 1514 unsigned int flags; 1515 1516 if (!ipv6_addr_equal(&group, &ma->mca_addr)) 1517 continue; 1518 flags = ma->mca_flags; 1519 1520 if (flags & MAF_TIMER_RUNNING) { 1521 /* gsquery <- gsquery && mark */ 1522 if (!mark) 1523 WRITE_ONCE(ma->mca_flags, 1524 flags & ~MAF_GSQUERY); 1525 } else { 1526 /* gsquery <- mark */ 1527 if (mark) 1528 WRITE_ONCE(ma->mca_flags, 1529 flags | MAF_GSQUERY); 1530 else 1531 WRITE_ONCE(ma->mca_flags, 1532 flags & ~MAF_GSQUERY); 1533 } 1534 if (!(ma->mca_flags & MAF_GSQUERY) || 1535 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1536 igmp6_group_queried(ma, max_delay); 1537 break; 1538 } 1539 } 1540 1541 out: 1542 in6_dev_put(idev); 1543 kfree_skb: 1544 consume_skb(skb); 1545 } 1546 1547 static void mld_query_work(struct work_struct *work) 1548 { 1549 struct inet6_dev *idev = container_of(to_delayed_work(work), 1550 struct inet6_dev, 1551 mc_query_work); 1552 struct sk_buff_head q; 1553 struct sk_buff *skb; 1554 bool rework = false; 1555 int cnt = 0; 1556 1557 skb_queue_head_init(&q); 1558 1559 spin_lock_bh(&idev->mc_query_lock); 1560 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1561 __skb_queue_tail(&q, skb); 1562 1563 if (++cnt >= MLD_MAX_QUEUE) { 1564 rework = true; 1565 break; 1566 } 1567 } 1568 spin_unlock_bh(&idev->mc_query_lock); 1569 1570 mutex_lock(&idev->mc_lock); 1571 while ((skb = __skb_dequeue(&q))) 1572 __mld_query_work(skb); 1573 mutex_unlock(&idev->mc_lock); 1574 1575 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1576 return; 1577 1578 in6_dev_put(idev); 1579 } 1580 1581 /* called with rcu_read_lock() */ 1582 void igmp6_event_report(struct sk_buff *skb) 1583 { 1584 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1585 bool put = false; 1586 1587 if (!idev || idev->dead) 1588 goto out; 1589 1590 spin_lock_bh(&idev->mc_report_lock); 1591 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS && 1592 in6_dev_hold_safe(idev)) { 1593 __skb_queue_tail(&idev->mc_report_queue, skb); 1594 if (mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1595 put = true; 1596 skb = NULL; 1597 } 1598 spin_unlock_bh(&idev->mc_report_lock); 1599 1600 if (put) 1601 in6_dev_put(idev); 1602 out: 1603 kfree_skb(skb); 1604 } 1605 1606 static void __mld_report_work(struct sk_buff *skb) 1607 { 1608 struct inet6_dev *idev; 1609 struct ifmcaddr6 *ma; 1610 struct mld_msg *mld; 1611 int addr_type; 1612 1613 /* Our own report looped back. Ignore it. */ 1614 if (skb->pkt_type == PACKET_LOOPBACK) 1615 goto kfree_skb; 1616 1617 /* send our report if the MC router may not have heard this report */ 1618 if (skb->pkt_type != PACKET_MULTICAST && 1619 skb->pkt_type != PACKET_BROADCAST) 1620 goto kfree_skb; 1621 1622 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1623 goto kfree_skb; 1624 1625 mld = (struct mld_msg *)icmp6_hdr(skb); 1626 1627 /* Drop reports with not link local source */ 1628 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1629 if (addr_type != IPV6_ADDR_ANY && 1630 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1631 goto kfree_skb; 1632 1633 idev = in6_dev_get(skb->dev); 1634 if (!idev) 1635 goto kfree_skb; 1636 1637 /* 1638 * Cancel the work for this group 1639 */ 1640 1641 for_each_mc_mclock(idev, ma) { 1642 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1643 if (cancel_delayed_work(&ma->mca_work)) 1644 refcount_dec(&ma->mca_refcnt); 1645 WRITE_ONCE(ma->mca_flags, 1646 ma->mca_flags & ~(MAF_LAST_REPORTER | 1647 MAF_TIMER_RUNNING)); 1648 break; 1649 } 1650 } 1651 1652 in6_dev_put(idev); 1653 kfree_skb: 1654 consume_skb(skb); 1655 } 1656 1657 static void mld_report_work(struct work_struct *work) 1658 { 1659 struct inet6_dev *idev = container_of(to_delayed_work(work), 1660 struct inet6_dev, 1661 mc_report_work); 1662 struct sk_buff_head q; 1663 struct sk_buff *skb; 1664 bool rework = false; 1665 int cnt = 0; 1666 1667 skb_queue_head_init(&q); 1668 spin_lock_bh(&idev->mc_report_lock); 1669 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1670 __skb_queue_tail(&q, skb); 1671 1672 if (++cnt >= MLD_MAX_QUEUE) { 1673 rework = true; 1674 break; 1675 } 1676 } 1677 spin_unlock_bh(&idev->mc_report_lock); 1678 1679 mutex_lock(&idev->mc_lock); 1680 while ((skb = __skb_dequeue(&q))) 1681 __mld_report_work(skb); 1682 mutex_unlock(&idev->mc_lock); 1683 1684 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1685 return; 1686 1687 in6_dev_put(idev); 1688 } 1689 1690 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1691 int gdeleted, int sdeleted) 1692 { 1693 switch (type) { 1694 case MLD2_MODE_IS_INCLUDE: 1695 case MLD2_MODE_IS_EXCLUDE: 1696 if (gdeleted || sdeleted) 1697 return false; 1698 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1699 if (pmc->mca_sfmode == MCAST_INCLUDE) 1700 return true; 1701 /* don't include if this source is excluded 1702 * in all filters 1703 */ 1704 if (psf->sf_count[MCAST_INCLUDE]) 1705 return type == MLD2_MODE_IS_INCLUDE; 1706 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1707 psf->sf_count[MCAST_EXCLUDE]; 1708 } 1709 return false; 1710 case MLD2_CHANGE_TO_INCLUDE: 1711 if (gdeleted || sdeleted) 1712 return false; 1713 return psf->sf_count[MCAST_INCLUDE] != 0; 1714 case MLD2_CHANGE_TO_EXCLUDE: 1715 if (gdeleted || sdeleted) 1716 return false; 1717 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1718 psf->sf_count[MCAST_INCLUDE]) 1719 return false; 1720 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1721 psf->sf_count[MCAST_EXCLUDE]; 1722 case MLD2_ALLOW_NEW_SOURCES: 1723 if (gdeleted || !psf->sf_crcount) 1724 return false; 1725 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1726 case MLD2_BLOCK_OLD_SOURCES: 1727 if (pmc->mca_sfmode == MCAST_INCLUDE) 1728 return gdeleted || (psf->sf_crcount && sdeleted); 1729 return psf->sf_crcount && !gdeleted && !sdeleted; 1730 } 1731 return false; 1732 } 1733 1734 static int 1735 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1736 { 1737 struct ip6_sf_list *psf; 1738 int scount = 0; 1739 1740 for_each_psf_mclock(pmc, psf) { 1741 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1742 continue; 1743 scount++; 1744 } 1745 return scount; 1746 } 1747 1748 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1749 struct net_device *dev, const struct in6_addr *saddr, 1750 const struct in6_addr *daddr, int proto, int len) 1751 { 1752 struct ipv6hdr *hdr; 1753 1754 skb->protocol = htons(ETH_P_IPV6); 1755 skb->dev = dev; 1756 1757 skb_reset_network_header(skb); 1758 skb_put(skb, sizeof(struct ipv6hdr)); 1759 hdr = ipv6_hdr(skb); 1760 1761 ip6_flow_hdr(hdr, 0, 0); 1762 1763 hdr->payload_len = htons(len); 1764 hdr->nexthdr = proto; 1765 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1766 1767 hdr->saddr = *saddr; 1768 hdr->daddr = *daddr; 1769 } 1770 1771 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1772 { 1773 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1774 2, 0, 0, IPV6_TLV_PADN, 0 }; 1775 struct net_device *dev = idev->dev; 1776 int hlen = LL_RESERVED_SPACE(dev); 1777 int tlen = dev->needed_tailroom; 1778 const struct in6_addr *saddr; 1779 struct in6_addr addr_buf; 1780 struct mld2_report *pmr; 1781 struct sk_buff *skb; 1782 unsigned int size; 1783 struct sock *sk; 1784 struct net *net; 1785 1786 /* we assume size > sizeof(ra) here 1787 * Also try to not allocate high-order pages for big MTU 1788 */ 1789 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1790 skb = alloc_skb(size, GFP_KERNEL); 1791 if (!skb) 1792 return NULL; 1793 1794 skb->priority = TC_PRIO_CONTROL; 1795 skb_reserve(skb, hlen); 1796 skb_tailroom_reserve(skb, mtu, tlen); 1797 1798 rcu_read_lock(); 1799 1800 net = dev_net_rcu(dev); 1801 sk = net->ipv6.igmp_sk; 1802 skb_set_owner_w(skb, sk); 1803 1804 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1805 /* <draft-ietf-magma-mld-source-05.txt>: 1806 * use unspecified address as the source address 1807 * when a valid link-local address is not available. 1808 */ 1809 saddr = &in6addr_any; 1810 } else 1811 saddr = &addr_buf; 1812 1813 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1814 1815 rcu_read_unlock(); 1816 1817 skb_put_data(skb, ra, sizeof(ra)); 1818 1819 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1820 skb_put(skb, sizeof(*pmr)); 1821 pmr = (struct mld2_report *)skb_transport_header(skb); 1822 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1823 pmr->mld2r_resv1 = 0; 1824 pmr->mld2r_cksum = 0; 1825 pmr->mld2r_resv2 = 0; 1826 pmr->mld2r_ngrec = 0; 1827 return skb; 1828 } 1829 1830 static void mld_sendpack(struct sk_buff *skb) 1831 { 1832 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1833 struct mld2_report *pmr = 1834 (struct mld2_report *)skb_transport_header(skb); 1835 int payload_len, mldlen; 1836 struct inet6_dev *idev; 1837 struct net *net = dev_net(skb->dev); 1838 int err; 1839 struct flowi6 fl6; 1840 struct dst_entry *dst; 1841 1842 rcu_read_lock(); 1843 idev = __in6_dev_get(skb->dev); 1844 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1845 1846 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1847 sizeof(*pip6); 1848 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1849 pip6->payload_len = htons(payload_len); 1850 1851 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1852 IPPROTO_ICMPV6, 1853 csum_partial(skb_transport_header(skb), 1854 mldlen, 0)); 1855 1856 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1857 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1858 skb->dev->ifindex); 1859 dst = icmp6_dst_alloc(skb->dev, &fl6); 1860 1861 err = 0; 1862 if (IS_ERR(dst)) { 1863 err = PTR_ERR(dst); 1864 dst = NULL; 1865 } 1866 skb_dst_set(skb, dst); 1867 if (err) 1868 goto err_out; 1869 1870 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1871 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1872 dst_output); 1873 out: 1874 if (!err) { 1875 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1876 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1877 } else { 1878 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1879 } 1880 1881 rcu_read_unlock(); 1882 return; 1883 1884 err_out: 1885 kfree_skb(skb); 1886 goto out; 1887 } 1888 1889 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1890 { 1891 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1892 } 1893 1894 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1895 int type, struct mld2_grec **ppgr, unsigned int mtu) 1896 { 1897 struct mld2_report *pmr; 1898 struct mld2_grec *pgr; 1899 1900 if (!skb) { 1901 skb = mld_newpack(pmc->idev, mtu); 1902 if (!skb) 1903 return NULL; 1904 } 1905 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1906 pgr->grec_type = type; 1907 pgr->grec_auxwords = 0; 1908 pgr->grec_nsrcs = 0; 1909 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1910 pmr = (struct mld2_report *)skb_transport_header(skb); 1911 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1912 *ppgr = pgr; 1913 return skb; 1914 } 1915 1916 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1917 1918 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1919 int type, int gdeleted, int sdeleted, 1920 int crsend) 1921 { 1922 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1923 int scount, stotal, first, isquery, truncate; 1924 struct ip6_sf_list __rcu **psf_list; 1925 struct inet6_dev *idev = pmc->idev; 1926 struct net_device *dev = idev->dev; 1927 struct mld2_grec *pgr = NULL; 1928 struct mld2_report *pmr; 1929 unsigned int mtu; 1930 1931 mc_assert_locked(idev); 1932 1933 if (pmc->mca_flags & MAF_NOREPORT) 1934 return skb; 1935 1936 mtu = READ_ONCE(dev->mtu); 1937 if (mtu < IPV6_MIN_MTU) 1938 return skb; 1939 1940 isquery = type == MLD2_MODE_IS_INCLUDE || 1941 type == MLD2_MODE_IS_EXCLUDE; 1942 truncate = type == MLD2_MODE_IS_EXCLUDE || 1943 type == MLD2_CHANGE_TO_EXCLUDE; 1944 1945 stotal = scount = 0; 1946 1947 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1948 1949 if (!rcu_access_pointer(*psf_list)) 1950 goto empty_source; 1951 1952 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1953 1954 /* EX and TO_EX get a fresh packet, if needed */ 1955 if (truncate) { 1956 if (pmr && pmr->mld2r_ngrec && 1957 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1958 if (skb) 1959 mld_sendpack(skb); 1960 skb = mld_newpack(idev, mtu); 1961 } 1962 } 1963 first = 1; 1964 psf_prev = NULL; 1965 for (psf = mc_dereference(*psf_list, idev); 1966 psf; 1967 psf = psf_next) { 1968 struct in6_addr *psrc; 1969 1970 psf_next = mc_dereference(psf->sf_next, idev); 1971 1972 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1973 psf_prev = psf; 1974 continue; 1975 } 1976 1977 /* Based on RFC3810 6.1. Should not send source-list change 1978 * records when there is a filter mode change. 1979 */ 1980 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1981 (!gdeleted && pmc->mca_crcount)) && 1982 (type == MLD2_ALLOW_NEW_SOURCES || 1983 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1984 goto decrease_sf_crcount; 1985 1986 /* clear marks on query responses */ 1987 if (isquery) 1988 psf->sf_gsresp = 0; 1989 1990 if (AVAILABLE(skb) < sizeof(*psrc) + 1991 first*sizeof(struct mld2_grec)) { 1992 if (truncate && !first) 1993 break; /* truncate these */ 1994 if (pgr) 1995 pgr->grec_nsrcs = htons(scount); 1996 if (skb) 1997 mld_sendpack(skb); 1998 skb = mld_newpack(idev, mtu); 1999 first = 1; 2000 scount = 0; 2001 } 2002 if (first) { 2003 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2004 first = 0; 2005 } 2006 if (!skb) 2007 return NULL; 2008 psrc = skb_put(skb, sizeof(*psrc)); 2009 *psrc = psf->sf_addr; 2010 scount++; stotal++; 2011 if ((type == MLD2_ALLOW_NEW_SOURCES || 2012 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 2013 decrease_sf_crcount: 2014 psf->sf_crcount--; 2015 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 2016 if (psf_prev) 2017 rcu_assign_pointer(psf_prev->sf_next, 2018 mc_dereference(psf->sf_next, idev)); 2019 else 2020 rcu_assign_pointer(*psf_list, 2021 mc_dereference(psf->sf_next, idev)); 2022 kfree_rcu(psf, rcu); 2023 continue; 2024 } 2025 } 2026 psf_prev = psf; 2027 } 2028 2029 empty_source: 2030 if (!stotal) { 2031 if (type == MLD2_ALLOW_NEW_SOURCES || 2032 type == MLD2_BLOCK_OLD_SOURCES) 2033 return skb; 2034 if (pmc->mca_crcount || isquery || crsend) { 2035 /* make sure we have room for group header */ 2036 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 2037 mld_sendpack(skb); 2038 skb = NULL; /* add_grhead will get a new one */ 2039 } 2040 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2041 } 2042 } 2043 if (pgr) 2044 pgr->grec_nsrcs = htons(scount); 2045 2046 if (isquery) { 2047 /* clear query state */ 2048 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 2049 } 2050 return skb; 2051 } 2052 2053 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2054 { 2055 struct sk_buff *skb = NULL; 2056 int type; 2057 2058 mc_assert_locked(idev); 2059 2060 if (!pmc) { 2061 for_each_mc_mclock(idev, pmc) { 2062 if (pmc->mca_flags & MAF_NOREPORT) 2063 continue; 2064 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2065 type = MLD2_MODE_IS_EXCLUDE; 2066 else 2067 type = MLD2_MODE_IS_INCLUDE; 2068 skb = add_grec(skb, pmc, type, 0, 0, 0); 2069 } 2070 } else { 2071 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2072 type = MLD2_MODE_IS_EXCLUDE; 2073 else 2074 type = MLD2_MODE_IS_INCLUDE; 2075 skb = add_grec(skb, pmc, type, 0, 0, 0); 2076 } 2077 if (skb) 2078 mld_sendpack(skb); 2079 } 2080 2081 /* remove zero-count source records from a source filter list */ 2082 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2083 { 2084 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2085 2086 psf_prev = NULL; 2087 for (psf = mc_dereference(*ppsf, idev); 2088 psf; 2089 psf = psf_next) { 2090 psf_next = mc_dereference(psf->sf_next, idev); 2091 if (psf->sf_crcount == 0) { 2092 if (psf_prev) 2093 rcu_assign_pointer(psf_prev->sf_next, 2094 mc_dereference(psf->sf_next, idev)); 2095 else 2096 rcu_assign_pointer(*ppsf, 2097 mc_dereference(psf->sf_next, idev)); 2098 kfree_rcu(psf, rcu); 2099 } else { 2100 psf_prev = psf; 2101 } 2102 } 2103 } 2104 2105 static void mld_send_cr(struct inet6_dev *idev) 2106 { 2107 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2108 struct sk_buff *skb = NULL; 2109 int type, dtype; 2110 2111 /* deleted MCA's */ 2112 pmc_prev = NULL; 2113 for (pmc = mc_dereference(idev->mc_tomb, idev); 2114 pmc; 2115 pmc = pmc_next) { 2116 pmc_next = mc_dereference(pmc->next, idev); 2117 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2118 type = MLD2_BLOCK_OLD_SOURCES; 2119 dtype = MLD2_BLOCK_OLD_SOURCES; 2120 skb = add_grec(skb, pmc, type, 1, 0, 0); 2121 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2122 } 2123 if (pmc->mca_crcount) { 2124 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2125 type = MLD2_CHANGE_TO_INCLUDE; 2126 skb = add_grec(skb, pmc, type, 1, 0, 0); 2127 } 2128 pmc->mca_crcount--; 2129 if (pmc->mca_crcount == 0) { 2130 mld_clear_zeros(&pmc->mca_tomb, idev); 2131 mld_clear_zeros(&pmc->mca_sources, idev); 2132 } 2133 } 2134 if (pmc->mca_crcount == 0 && 2135 !rcu_access_pointer(pmc->mca_tomb) && 2136 !rcu_access_pointer(pmc->mca_sources)) { 2137 if (pmc_prev) 2138 rcu_assign_pointer(pmc_prev->next, pmc_next); 2139 else 2140 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2141 in6_dev_put(pmc->idev); 2142 kfree_rcu(pmc, rcu); 2143 } else 2144 pmc_prev = pmc; 2145 } 2146 2147 /* change recs */ 2148 for_each_mc_mclock(idev, pmc) { 2149 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2150 type = MLD2_BLOCK_OLD_SOURCES; 2151 dtype = MLD2_ALLOW_NEW_SOURCES; 2152 } else { 2153 type = MLD2_ALLOW_NEW_SOURCES; 2154 dtype = MLD2_BLOCK_OLD_SOURCES; 2155 } 2156 skb = add_grec(skb, pmc, type, 0, 0, 0); 2157 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2158 2159 /* filter mode changes */ 2160 if (pmc->mca_crcount) { 2161 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2162 type = MLD2_CHANGE_TO_EXCLUDE; 2163 else 2164 type = MLD2_CHANGE_TO_INCLUDE; 2165 skb = add_grec(skb, pmc, type, 0, 0, 0); 2166 pmc->mca_crcount--; 2167 } 2168 } 2169 if (!skb) 2170 return; 2171 (void) mld_sendpack(skb); 2172 } 2173 2174 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2175 { 2176 const struct in6_addr *snd_addr, *saddr; 2177 int err, len, payload_len, full_len; 2178 struct in6_addr addr_buf; 2179 struct inet6_dev *idev; 2180 struct sk_buff *skb; 2181 struct mld_msg *hdr; 2182 int hlen = LL_RESERVED_SPACE(dev); 2183 int tlen = dev->needed_tailroom; 2184 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2185 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2186 IPV6_TLV_PADN, 0 }; 2187 struct dst_entry *dst; 2188 struct flowi6 fl6; 2189 struct net *net; 2190 struct sock *sk; 2191 2192 if (type == ICMPV6_MGM_REDUCTION) 2193 snd_addr = &in6addr_linklocal_allrouters; 2194 else 2195 snd_addr = addr; 2196 2197 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2198 payload_len = len + sizeof(ra); 2199 full_len = sizeof(struct ipv6hdr) + payload_len; 2200 2201 skb = alloc_skb(hlen + tlen + full_len, GFP_KERNEL); 2202 2203 rcu_read_lock(); 2204 2205 net = dev_net_rcu(dev); 2206 idev = __in6_dev_get(dev); 2207 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 2208 if (!skb) { 2209 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2210 rcu_read_unlock(); 2211 return; 2212 } 2213 sk = net->ipv6.igmp_sk; 2214 skb_set_owner_w(skb, sk); 2215 2216 skb->priority = TC_PRIO_CONTROL; 2217 skb_reserve(skb, hlen); 2218 2219 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2220 /* <draft-ietf-magma-mld-source-05.txt>: 2221 * use unspecified address as the source address 2222 * when a valid link-local address is not available. 2223 */ 2224 saddr = &in6addr_any; 2225 } else 2226 saddr = &addr_buf; 2227 2228 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2229 2230 skb_put_data(skb, ra, sizeof(ra)); 2231 2232 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2233 hdr->mld_type = type; 2234 hdr->mld_mca = *addr; 2235 2236 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2237 IPPROTO_ICMPV6, 2238 csum_partial(hdr, len, 0)); 2239 2240 icmpv6_flow_init(sk, &fl6, type, 2241 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2242 skb->dev->ifindex); 2243 dst = icmp6_dst_alloc(skb->dev, &fl6); 2244 if (IS_ERR(dst)) { 2245 err = PTR_ERR(dst); 2246 goto err_out; 2247 } 2248 2249 skb_dst_set(skb, dst); 2250 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2251 net, sk, skb, NULL, skb->dev, 2252 dst_output); 2253 out: 2254 if (!err) { 2255 ICMP6MSGOUT_INC_STATS(net, idev, type); 2256 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2257 } else 2258 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2259 2260 rcu_read_unlock(); 2261 return; 2262 2263 err_out: 2264 kfree_skb(skb); 2265 goto out; 2266 } 2267 2268 static void mld_send_initial_cr(struct inet6_dev *idev) 2269 { 2270 struct ifmcaddr6 *pmc; 2271 struct sk_buff *skb; 2272 int type; 2273 2274 mc_assert_locked(idev); 2275 2276 if (mld_in_v1_mode(idev)) 2277 return; 2278 2279 skb = NULL; 2280 for_each_mc_mclock(idev, pmc) { 2281 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2282 type = MLD2_CHANGE_TO_EXCLUDE; 2283 else 2284 type = MLD2_ALLOW_NEW_SOURCES; 2285 skb = add_grec(skb, pmc, type, 0, 0, 1); 2286 } 2287 if (skb) 2288 mld_sendpack(skb); 2289 } 2290 2291 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2292 { 2293 mutex_lock(&idev->mc_lock); 2294 idev->mc_dad_count = idev->mc_qrv; 2295 if (idev->mc_dad_count) { 2296 mld_send_initial_cr(idev); 2297 idev->mc_dad_count--; 2298 if (idev->mc_dad_count) 2299 mld_dad_start_work(idev, 2300 unsolicited_report_interval(idev)); 2301 } 2302 mutex_unlock(&idev->mc_lock); 2303 } 2304 2305 static void mld_dad_work(struct work_struct *work) 2306 { 2307 struct inet6_dev *idev = container_of(to_delayed_work(work), 2308 struct inet6_dev, 2309 mc_dad_work); 2310 mutex_lock(&idev->mc_lock); 2311 mld_send_initial_cr(idev); 2312 if (idev->mc_dad_count) { 2313 idev->mc_dad_count--; 2314 if (idev->mc_dad_count) 2315 mld_dad_start_work(idev, 2316 unsolicited_report_interval(idev)); 2317 } 2318 mutex_unlock(&idev->mc_lock); 2319 in6_dev_put(idev); 2320 } 2321 2322 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2323 const struct in6_addr *psfsrc) 2324 { 2325 struct ip6_sf_list *psf, *psf_prev; 2326 int rv = 0; 2327 2328 mc_assert_locked(pmc->idev); 2329 2330 psf_prev = NULL; 2331 for_each_psf_mclock(pmc, psf) { 2332 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2333 break; 2334 psf_prev = psf; 2335 } 2336 if (!psf || psf->sf_count[sfmode] == 0) { 2337 /* source filter not found, or count wrong => bug */ 2338 return -ESRCH; 2339 } 2340 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1); 2341 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2342 struct inet6_dev *idev = pmc->idev; 2343 2344 /* no more filters for this source */ 2345 if (psf_prev) 2346 rcu_assign_pointer(psf_prev->sf_next, 2347 mc_dereference(psf->sf_next, idev)); 2348 else 2349 rcu_assign_pointer(pmc->mca_sources, 2350 mc_dereference(psf->sf_next, idev)); 2351 2352 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2353 !mld_in_v1_mode(idev)) { 2354 psf->sf_crcount = idev->mc_qrv; 2355 rcu_assign_pointer(psf->sf_next, 2356 mc_dereference(pmc->mca_tomb, idev)); 2357 rcu_assign_pointer(pmc->mca_tomb, psf); 2358 rv = 1; 2359 } else { 2360 kfree_rcu(psf, rcu); 2361 } 2362 } 2363 return rv; 2364 } 2365 2366 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2367 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2368 int delta) 2369 { 2370 struct ifmcaddr6 *pmc; 2371 int changerec = 0; 2372 int i, err; 2373 2374 if (!idev) 2375 return -ENODEV; 2376 2377 mc_assert_locked(idev); 2378 2379 for_each_mc_mclock(idev, pmc) { 2380 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2381 break; 2382 } 2383 if (!pmc) 2384 return -ESRCH; 2385 2386 sf_markstate(pmc); 2387 if (!delta) { 2388 if (!pmc->mca_sfcount[sfmode]) 2389 return -EINVAL; 2390 2391 pmc->mca_sfcount[sfmode]--; 2392 } 2393 err = 0; 2394 for (i = 0; i < sfcount; i++) { 2395 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2396 2397 changerec |= rv > 0; 2398 if (!err && rv < 0) 2399 err = rv; 2400 } 2401 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2402 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2403 pmc->mca_sfcount[MCAST_INCLUDE]) { 2404 struct ip6_sf_list *psf; 2405 2406 /* filter mode change */ 2407 pmc->mca_sfmode = MCAST_INCLUDE; 2408 pmc->mca_crcount = idev->mc_qrv; 2409 idev->mc_ifc_count = pmc->mca_crcount; 2410 for_each_psf_mclock(pmc, psf) 2411 psf->sf_crcount = 0; 2412 mld_ifc_event(pmc->idev); 2413 } else if (sf_setstate(pmc) || changerec) { 2414 mld_ifc_event(pmc->idev); 2415 } 2416 2417 return err; 2418 } 2419 2420 /* Add multicast single-source filter to the interface list */ 2421 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2422 const struct in6_addr *psfsrc) 2423 { 2424 struct ip6_sf_list *psf, *psf_prev; 2425 2426 mc_assert_locked(pmc->idev); 2427 2428 psf_prev = NULL; 2429 for_each_psf_mclock(pmc, psf) { 2430 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2431 break; 2432 psf_prev = psf; 2433 } 2434 if (!psf) { 2435 psf = kzalloc_obj(*psf); 2436 if (!psf) 2437 return -ENOBUFS; 2438 2439 psf->sf_addr = *psfsrc; 2440 if (psf_prev) { 2441 rcu_assign_pointer(psf_prev->sf_next, psf); 2442 } else { 2443 rcu_assign_pointer(pmc->mca_sources, psf); 2444 } 2445 } 2446 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1); 2447 return 0; 2448 } 2449 2450 static void sf_markstate(struct ifmcaddr6 *pmc) 2451 { 2452 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2453 struct ip6_sf_list *psf; 2454 2455 mc_assert_locked(pmc->idev); 2456 2457 for_each_psf_mclock(pmc, psf) { 2458 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2459 psf->sf_oldin = mca_xcount == 2460 psf->sf_count[MCAST_EXCLUDE] && 2461 !psf->sf_count[MCAST_INCLUDE]; 2462 } else { 2463 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2464 } 2465 } 2466 } 2467 2468 static int sf_setstate(struct ifmcaddr6 *pmc) 2469 { 2470 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2471 struct ip6_sf_list *psf, *dpsf; 2472 int qrv = pmc->idev->mc_qrv; 2473 int new_in, rv; 2474 2475 mc_assert_locked(pmc->idev); 2476 2477 rv = 0; 2478 for_each_psf_mclock(pmc, psf) { 2479 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2480 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2481 !psf->sf_count[MCAST_INCLUDE]; 2482 } else 2483 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2484 if (new_in) { 2485 if (!psf->sf_oldin) { 2486 struct ip6_sf_list *prev = NULL; 2487 2488 for_each_psf_tomb(pmc, dpsf) { 2489 if (ipv6_addr_equal(&dpsf->sf_addr, 2490 &psf->sf_addr)) 2491 break; 2492 prev = dpsf; 2493 } 2494 if (dpsf) { 2495 if (prev) 2496 rcu_assign_pointer(prev->sf_next, 2497 mc_dereference(dpsf->sf_next, 2498 pmc->idev)); 2499 else 2500 rcu_assign_pointer(pmc->mca_tomb, 2501 mc_dereference(dpsf->sf_next, 2502 pmc->idev)); 2503 kfree_rcu(dpsf, rcu); 2504 } 2505 psf->sf_crcount = qrv; 2506 rv++; 2507 } 2508 } else if (psf->sf_oldin) { 2509 psf->sf_crcount = 0; 2510 /* 2511 * add or update "delete" records if an active filter 2512 * is now inactive 2513 */ 2514 2515 for_each_psf_tomb(pmc, dpsf) 2516 if (ipv6_addr_equal(&dpsf->sf_addr, 2517 &psf->sf_addr)) 2518 break; 2519 if (!dpsf) { 2520 dpsf = kmalloc_obj(*dpsf); 2521 if (!dpsf) 2522 continue; 2523 *dpsf = *psf; 2524 rcu_assign_pointer(dpsf->sf_next, 2525 mc_dereference(pmc->mca_tomb, pmc->idev)); 2526 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2527 } 2528 dpsf->sf_crcount = qrv; 2529 rv++; 2530 } 2531 } 2532 return rv; 2533 } 2534 2535 /* Add multicast source filter list to the interface list */ 2536 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2537 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2538 int delta) 2539 { 2540 struct ifmcaddr6 *pmc; 2541 int isexclude; 2542 int i, err; 2543 2544 if (!idev) 2545 return -ENODEV; 2546 2547 mc_assert_locked(idev); 2548 2549 for_each_mc_mclock(idev, pmc) { 2550 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2551 break; 2552 } 2553 if (!pmc) 2554 return -ESRCH; 2555 2556 sf_markstate(pmc); 2557 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2558 if (!delta) 2559 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2560 pmc->mca_sfcount[sfmode] + 1); 2561 err = 0; 2562 for (i = 0; i < sfcount; i++) { 2563 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2564 if (err) 2565 break; 2566 } 2567 if (err) { 2568 int j; 2569 2570 if (!delta) 2571 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2572 pmc->mca_sfcount[sfmode] - 1); 2573 for (j = 0; j < i; j++) 2574 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2575 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2576 struct ip6_sf_list *psf; 2577 2578 /* filter mode change */ 2579 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2580 pmc->mca_sfmode = MCAST_EXCLUDE; 2581 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2582 pmc->mca_sfmode = MCAST_INCLUDE; 2583 /* else no filters; keep old mode for reports */ 2584 2585 pmc->mca_crcount = idev->mc_qrv; 2586 idev->mc_ifc_count = pmc->mca_crcount; 2587 for_each_psf_mclock(pmc, psf) 2588 psf->sf_crcount = 0; 2589 mld_ifc_event(idev); 2590 } else if (sf_setstate(pmc)) { 2591 mld_ifc_event(idev); 2592 } 2593 return err; 2594 } 2595 2596 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2597 { 2598 struct ip6_sf_list *psf, *nextpsf; 2599 2600 mc_assert_locked(pmc->idev); 2601 2602 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2603 psf; 2604 psf = nextpsf) { 2605 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2606 kfree_rcu(psf, rcu); 2607 } 2608 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2609 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2610 psf; 2611 psf = nextpsf) { 2612 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2613 kfree_rcu(psf, rcu); 2614 } 2615 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2616 pmc->mca_sfmode = MCAST_EXCLUDE; 2617 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2618 /* Paired with the READ_ONCE() from ipv6_chk_mcast_addr() */ 2619 WRITE_ONCE(pmc->mca_sfcount[MCAST_EXCLUDE], 1); 2620 } 2621 2622 static void igmp6_join_group(struct ifmcaddr6 *ma) 2623 { 2624 unsigned long delay; 2625 2626 mc_assert_locked(ma->idev); 2627 2628 if (ma->mca_flags & MAF_NOREPORT) 2629 return; 2630 2631 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2632 2633 delay = get_random_u32_below(unsolicited_report_interval(ma->idev)); 2634 2635 if (cancel_delayed_work(&ma->mca_work)) { 2636 refcount_dec(&ma->mca_refcnt); 2637 delay = ma->mca_work.timer.expires - jiffies; 2638 } 2639 2640 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2641 refcount_inc(&ma->mca_refcnt); 2642 WRITE_ONCE(ma->mca_flags, ma->mca_flags | 2643 MAF_TIMER_RUNNING | MAF_LAST_REPORTER); 2644 } 2645 2646 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2647 struct inet6_dev *idev) 2648 { 2649 struct ip6_sf_socklist *psl; 2650 int err; 2651 2652 psl = sock_dereference(iml->sflist, sk); 2653 2654 if (idev) 2655 mutex_lock(&idev->mc_lock); 2656 2657 if (!psl) { 2658 /* any-source empty exclude case */ 2659 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2660 } else { 2661 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2662 psl->sl_count, psl->sl_addr, 0); 2663 RCU_INIT_POINTER(iml->sflist, NULL); 2664 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2665 &sk->sk_omem_alloc); 2666 kfree_rcu(psl, rcu); 2667 } 2668 2669 if (idev) 2670 mutex_unlock(&idev->mc_lock); 2671 2672 return err; 2673 } 2674 2675 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2676 { 2677 mc_assert_locked(ma->idev); 2678 2679 if (mld_in_v1_mode(ma->idev)) { 2680 if (ma->mca_flags & MAF_LAST_REPORTER) { 2681 igmp6_send(&ma->mca_addr, ma->idev->dev, 2682 ICMPV6_MGM_REDUCTION); 2683 } 2684 } else { 2685 mld_add_delrec(ma->idev, ma); 2686 mld_ifc_event(ma->idev); 2687 } 2688 } 2689 2690 static void mld_gq_work(struct work_struct *work) 2691 { 2692 struct inet6_dev *idev = container_of(to_delayed_work(work), 2693 struct inet6_dev, 2694 mc_gq_work); 2695 2696 mutex_lock(&idev->mc_lock); 2697 mld_send_report(idev, NULL); 2698 idev->mc_gq_running = 0; 2699 mutex_unlock(&idev->mc_lock); 2700 2701 in6_dev_put(idev); 2702 } 2703 2704 static void mld_ifc_work(struct work_struct *work) 2705 { 2706 struct inet6_dev *idev = container_of(to_delayed_work(work), 2707 struct inet6_dev, 2708 mc_ifc_work); 2709 2710 mutex_lock(&idev->mc_lock); 2711 mld_send_cr(idev); 2712 2713 if (idev->mc_ifc_count) { 2714 idev->mc_ifc_count--; 2715 if (idev->mc_ifc_count) 2716 mld_ifc_start_work(idev, 2717 unsolicited_report_interval(idev)); 2718 } 2719 mutex_unlock(&idev->mc_lock); 2720 in6_dev_put(idev); 2721 } 2722 2723 static void mld_ifc_event(struct inet6_dev *idev) 2724 { 2725 mc_assert_locked(idev); 2726 2727 if (mld_in_v1_mode(idev)) 2728 return; 2729 2730 idev->mc_ifc_count = idev->mc_qrv; 2731 mld_ifc_start_work(idev, 1); 2732 } 2733 2734 static void mld_mca_work(struct work_struct *work) 2735 { 2736 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2737 struct ifmcaddr6, mca_work); 2738 2739 mutex_lock(&ma->idev->mc_lock); 2740 if (mld_in_v1_mode(ma->idev)) 2741 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2742 else 2743 mld_send_report(ma->idev, ma); 2744 WRITE_ONCE(ma->mca_flags, (ma->mca_flags | MAF_LAST_REPORTER) & 2745 ~MAF_TIMER_RUNNING); 2746 mutex_unlock(&ma->idev->mc_lock); 2747 2748 ma_put(ma); 2749 } 2750 2751 /* Device changing type */ 2752 2753 void ipv6_mc_unmap(struct inet6_dev *idev) 2754 { 2755 struct ifmcaddr6 *i; 2756 2757 /* Install multicast list, except for all-nodes (already installed) */ 2758 2759 mutex_lock(&idev->mc_lock); 2760 for_each_mc_mclock(idev, i) 2761 igmp6_group_dropped(i); 2762 mutex_unlock(&idev->mc_lock); 2763 } 2764 2765 void ipv6_mc_remap(struct inet6_dev *idev) 2766 { 2767 ipv6_mc_up(idev); 2768 } 2769 2770 /* Device going down */ 2771 void ipv6_mc_down(struct inet6_dev *idev) 2772 { 2773 struct ifmcaddr6 *i; 2774 2775 mutex_lock(&idev->mc_lock); 2776 /* Withdraw multicast list */ 2777 for_each_mc_mclock(idev, i) 2778 igmp6_group_dropped(i); 2779 mutex_unlock(&idev->mc_lock); 2780 2781 /* Should stop work after group drop. or we will 2782 * start work again in mld_ifc_event() 2783 */ 2784 mld_query_stop_work(idev); 2785 mld_report_stop_work(idev); 2786 2787 mutex_lock(&idev->mc_lock); 2788 mld_ifc_stop_work(idev); 2789 mld_gq_stop_work(idev); 2790 mutex_unlock(&idev->mc_lock); 2791 2792 mld_dad_stop_work(idev); 2793 } 2794 2795 static void ipv6_mc_reset(struct inet6_dev *idev) 2796 { 2797 idev->mc_qrv = sysctl_mld_qrv; 2798 idev->mc_qi = MLD_QI_DEFAULT; 2799 idev->mc_qri = MLD_QRI_DEFAULT; 2800 idev->mc_v1_seen = 0; 2801 idev->mc_maxdelay = unsolicited_report_interval(idev); 2802 } 2803 2804 /* Device going up */ 2805 2806 void ipv6_mc_up(struct inet6_dev *idev) 2807 { 2808 struct ifmcaddr6 *i; 2809 2810 /* Install multicast list, except for all-nodes (already installed) */ 2811 2812 ipv6_mc_reset(idev); 2813 mutex_lock(&idev->mc_lock); 2814 for_each_mc_mclock(idev, i) { 2815 mld_del_delrec(idev, i); 2816 igmp6_group_added(i); 2817 } 2818 mutex_unlock(&idev->mc_lock); 2819 } 2820 2821 /* IPv6 device initialization. */ 2822 2823 void ipv6_mc_init_dev(struct inet6_dev *idev) 2824 { 2825 idev->mc_gq_running = 0; 2826 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2827 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2828 idev->mc_ifc_count = 0; 2829 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2830 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2831 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2832 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2833 skb_queue_head_init(&idev->mc_query_queue); 2834 skb_queue_head_init(&idev->mc_report_queue); 2835 spin_lock_init(&idev->mc_query_lock); 2836 spin_lock_init(&idev->mc_report_lock); 2837 mutex_init(&idev->mc_lock); 2838 ipv6_mc_reset(idev); 2839 } 2840 2841 /* 2842 * Device is about to be destroyed: clean up. 2843 */ 2844 2845 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2846 { 2847 struct ifmcaddr6 *i; 2848 2849 /* Deactivate works */ 2850 ipv6_mc_down(idev); 2851 mutex_lock(&idev->mc_lock); 2852 mld_clear_delrec(idev); 2853 mutex_unlock(&idev->mc_lock); 2854 mld_clear_query(idev); 2855 mld_clear_report(idev); 2856 2857 /* Delete all-nodes address. */ 2858 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2859 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2860 * fail. 2861 */ 2862 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2863 2864 if (idev->cnf.forwarding) 2865 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2866 2867 mutex_lock(&idev->mc_lock); 2868 while ((i = mc_dereference(idev->mc_list, idev))) { 2869 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2870 2871 ip6_mc_clear_src(i); 2872 ma_put(i); 2873 } 2874 mutex_unlock(&idev->mc_lock); 2875 } 2876 2877 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2878 { 2879 struct ifmcaddr6 *pmc; 2880 2881 mutex_lock(&idev->mc_lock); 2882 if (mld_in_v1_mode(idev)) { 2883 for_each_mc_mclock(idev, pmc) 2884 igmp6_join_group(pmc); 2885 } else { 2886 mld_send_report(idev, NULL); 2887 } 2888 mutex_unlock(&idev->mc_lock); 2889 } 2890 2891 static int ipv6_mc_netdev_event(struct notifier_block *this, 2892 unsigned long event, 2893 void *ptr) 2894 { 2895 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2896 struct inet6_dev *idev = __in6_dev_get(dev); 2897 2898 switch (event) { 2899 case NETDEV_RESEND_IGMP: 2900 if (idev) 2901 ipv6_mc_rejoin_groups(idev); 2902 break; 2903 default: 2904 break; 2905 } 2906 2907 return NOTIFY_DONE; 2908 } 2909 2910 static struct notifier_block igmp6_netdev_notifier = { 2911 .notifier_call = ipv6_mc_netdev_event, 2912 }; 2913 2914 #ifdef CONFIG_PROC_FS 2915 struct igmp6_mc_iter_state { 2916 struct seq_net_private p; 2917 struct net_device *dev; 2918 struct inet6_dev *idev; 2919 }; 2920 2921 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2922 2923 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2924 { 2925 struct ifmcaddr6 *im = NULL; 2926 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2927 struct net *net = seq_file_net(seq); 2928 2929 state->idev = NULL; 2930 for_each_netdev_rcu(net, state->dev) { 2931 struct inet6_dev *idev; 2932 idev = __in6_dev_get(state->dev); 2933 if (!idev) 2934 continue; 2935 2936 im = rcu_dereference(idev->mc_list); 2937 if (im) { 2938 state->idev = idev; 2939 break; 2940 } 2941 } 2942 return im; 2943 } 2944 2945 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2946 { 2947 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2948 2949 im = rcu_dereference(im->next); 2950 while (!im) { 2951 state->dev = next_net_device_rcu(state->dev); 2952 if (!state->dev) { 2953 state->idev = NULL; 2954 break; 2955 } 2956 state->idev = __in6_dev_get(state->dev); 2957 if (!state->idev) 2958 continue; 2959 im = rcu_dereference(state->idev->mc_list); 2960 } 2961 return im; 2962 } 2963 2964 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2965 { 2966 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2967 if (im) 2968 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2969 --pos; 2970 return pos ? NULL : im; 2971 } 2972 2973 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2974 __acquires(RCU) 2975 { 2976 rcu_read_lock(); 2977 return igmp6_mc_get_idx(seq, *pos); 2978 } 2979 2980 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2981 { 2982 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2983 2984 ++*pos; 2985 return im; 2986 } 2987 2988 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2989 __releases(RCU) 2990 { 2991 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2992 2993 if (likely(state->idev)) 2994 state->idev = NULL; 2995 state->dev = NULL; 2996 rcu_read_unlock(); 2997 } 2998 2999 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 3000 { 3001 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 3002 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 3003 unsigned int mca_flags = READ_ONCE(im->mca_flags); 3004 unsigned long expires = READ_ONCE(im->mca_work.timer.expires); 3005 3006 seq_printf(seq, 3007 "%-4d %-15s %pi6 %5d %08X %ld\n", 3008 state->dev->ifindex, state->dev->name, 3009 &im->mca_addr, 3010 READ_ONCE(im->mca_users), mca_flags, 3011 (mca_flags & MAF_TIMER_RUNNING) ? 3012 jiffies_to_clock_t(expires - jiffies) : 0); 3013 return 0; 3014 } 3015 3016 static const struct seq_operations igmp6_mc_seq_ops = { 3017 .start = igmp6_mc_seq_start, 3018 .next = igmp6_mc_seq_next, 3019 .stop = igmp6_mc_seq_stop, 3020 .show = igmp6_mc_seq_show, 3021 }; 3022 3023 struct igmp6_mcf_iter_state { 3024 struct seq_net_private p; 3025 struct net_device *dev; 3026 struct inet6_dev *idev; 3027 struct ifmcaddr6 *im; 3028 }; 3029 3030 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 3031 3032 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 3033 { 3034 struct ip6_sf_list *psf = NULL; 3035 struct ifmcaddr6 *im = NULL; 3036 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3037 struct net *net = seq_file_net(seq); 3038 3039 state->idev = NULL; 3040 state->im = NULL; 3041 for_each_netdev_rcu(net, state->dev) { 3042 struct inet6_dev *idev; 3043 idev = __in6_dev_get(state->dev); 3044 if (unlikely(idev == NULL)) 3045 continue; 3046 3047 im = rcu_dereference(idev->mc_list); 3048 if (likely(im)) { 3049 psf = rcu_dereference(im->mca_sources); 3050 if (likely(psf)) { 3051 state->im = im; 3052 state->idev = idev; 3053 break; 3054 } 3055 } 3056 } 3057 return psf; 3058 } 3059 3060 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3061 { 3062 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3063 3064 psf = rcu_dereference(psf->sf_next); 3065 while (!psf) { 3066 state->im = rcu_dereference(state->im->next); 3067 while (!state->im) { 3068 state->dev = next_net_device_rcu(state->dev); 3069 if (!state->dev) { 3070 state->idev = NULL; 3071 goto out; 3072 } 3073 state->idev = __in6_dev_get(state->dev); 3074 if (!state->idev) 3075 continue; 3076 state->im = rcu_dereference(state->idev->mc_list); 3077 } 3078 psf = rcu_dereference(state->im->mca_sources); 3079 } 3080 out: 3081 return psf; 3082 } 3083 3084 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3085 { 3086 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3087 if (psf) 3088 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3089 --pos; 3090 return pos ? NULL : psf; 3091 } 3092 3093 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3094 __acquires(RCU) 3095 { 3096 rcu_read_lock(); 3097 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3098 } 3099 3100 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3101 { 3102 struct ip6_sf_list *psf; 3103 if (v == SEQ_START_TOKEN) 3104 psf = igmp6_mcf_get_first(seq); 3105 else 3106 psf = igmp6_mcf_get_next(seq, v); 3107 ++*pos; 3108 return psf; 3109 } 3110 3111 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3112 __releases(RCU) 3113 { 3114 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3115 3116 if (likely(state->im)) 3117 state->im = NULL; 3118 if (likely(state->idev)) 3119 state->idev = NULL; 3120 3121 state->dev = NULL; 3122 rcu_read_unlock(); 3123 } 3124 3125 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3126 { 3127 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3128 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3129 3130 if (v == SEQ_START_TOKEN) { 3131 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3132 } else { 3133 seq_printf(seq, 3134 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3135 state->dev->ifindex, state->dev->name, 3136 &state->im->mca_addr, 3137 &psf->sf_addr, 3138 READ_ONCE(psf->sf_count[MCAST_INCLUDE]), 3139 READ_ONCE(psf->sf_count[MCAST_EXCLUDE])); 3140 } 3141 return 0; 3142 } 3143 3144 static const struct seq_operations igmp6_mcf_seq_ops = { 3145 .start = igmp6_mcf_seq_start, 3146 .next = igmp6_mcf_seq_next, 3147 .stop = igmp6_mcf_seq_stop, 3148 .show = igmp6_mcf_seq_show, 3149 }; 3150 3151 static int __net_init igmp6_proc_init(struct net *net) 3152 { 3153 int err; 3154 3155 err = -ENOMEM; 3156 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3157 sizeof(struct igmp6_mc_iter_state))) 3158 goto out; 3159 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3160 &igmp6_mcf_seq_ops, 3161 sizeof(struct igmp6_mcf_iter_state))) 3162 goto out_proc_net_igmp6; 3163 3164 err = 0; 3165 out: 3166 return err; 3167 3168 out_proc_net_igmp6: 3169 remove_proc_entry("igmp6", net->proc_net); 3170 goto out; 3171 } 3172 3173 static void __net_exit igmp6_proc_exit(struct net *net) 3174 { 3175 remove_proc_entry("mcfilter6", net->proc_net); 3176 remove_proc_entry("igmp6", net->proc_net); 3177 } 3178 #else 3179 static inline int igmp6_proc_init(struct net *net) 3180 { 3181 return 0; 3182 } 3183 static inline void igmp6_proc_exit(struct net *net) 3184 { 3185 } 3186 #endif 3187 3188 static int __net_init igmp6_net_init(struct net *net) 3189 { 3190 int err; 3191 3192 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3193 SOCK_RAW, IPPROTO_ICMPV6, net); 3194 if (err < 0) { 3195 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3196 err); 3197 goto out; 3198 } 3199 3200 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3201 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3202 3203 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3204 SOCK_RAW, IPPROTO_ICMPV6, net); 3205 if (err < 0) { 3206 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3207 err); 3208 goto out_sock_create; 3209 } 3210 3211 err = igmp6_proc_init(net); 3212 if (err) 3213 goto out_sock_create_autojoin; 3214 3215 return 0; 3216 3217 out_sock_create_autojoin: 3218 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3219 out_sock_create: 3220 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3221 out: 3222 return err; 3223 } 3224 3225 static void __net_exit igmp6_net_exit(struct net *net) 3226 { 3227 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3228 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3229 igmp6_proc_exit(net); 3230 } 3231 3232 static struct pernet_operations igmp6_net_ops = { 3233 .init = igmp6_net_init, 3234 .exit = igmp6_net_exit, 3235 }; 3236 3237 int __init igmp6_init(void) 3238 { 3239 int err; 3240 3241 err = register_pernet_subsys(&igmp6_net_ops); 3242 if (err) 3243 return err; 3244 3245 mld_wq = create_workqueue("mld"); 3246 if (!mld_wq) { 3247 unregister_pernet_subsys(&igmp6_net_ops); 3248 return -ENOMEM; 3249 } 3250 3251 return err; 3252 } 3253 3254 int __init igmp6_late_init(void) 3255 { 3256 return register_netdevice_notifier(&igmp6_netdev_notifier); 3257 } 3258 3259 void igmp6_cleanup(void) 3260 { 3261 unregister_pernet_subsys(&igmp6_net_ops); 3262 destroy_workqueue(mld_wq); 3263 } 3264 3265 void igmp6_late_cleanup(void) 3266 { 3267 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3268 } 3269