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 rcu_assign_pointer(mc_lst->next, 244 sock_dereference(np->ipv6_mc_list, sk)); 245 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 246 247 return 0; 248 } 249 250 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 251 { 252 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 253 } 254 EXPORT_SYMBOL(ipv6_sock_mc_join); 255 256 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 257 const struct in6_addr *addr, unsigned int mode) 258 { 259 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 260 } 261 262 /* 263 * socket leave on multicast group 264 */ 265 static void __ipv6_sock_mc_drop(struct sock *sk, struct ipv6_mc_socklist *mc_lst) 266 { 267 struct net *net = sock_net(sk); 268 struct net_device *dev; 269 270 dev = dev_get_by_index(net, mc_lst->ifindex); 271 if (dev) { 272 struct inet6_dev *idev = in6_dev_get(dev); 273 274 ip6_mc_leave_src(sk, mc_lst, idev); 275 276 if (idev) { 277 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 278 in6_dev_put(idev); 279 } 280 281 dev_put(dev); 282 } else { 283 ip6_mc_leave_src(sk, mc_lst, NULL); 284 } 285 286 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 287 kfree_rcu(mc_lst, rcu); 288 } 289 290 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 291 { 292 struct ipv6_pinfo *np = inet6_sk(sk); 293 struct ipv6_mc_socklist __rcu **lnk; 294 struct ipv6_mc_socklist *mc_lst; 295 296 if (!ipv6_addr_is_multicast(addr)) 297 return -EINVAL; 298 299 for (lnk = &np->ipv6_mc_list; 300 (mc_lst = sock_dereference(*lnk, sk)) != NULL; 301 lnk = &mc_lst->next) { 302 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 303 ipv6_addr_equal(&mc_lst->addr, addr)) { 304 rcu_assign_pointer(*lnk, 305 sock_dereference(mc_lst->next, sk)); 306 __ipv6_sock_mc_drop(sk, mc_lst); 307 return 0; 308 } 309 } 310 311 return -EADDRNOTAVAIL; 312 } 313 EXPORT_SYMBOL(ipv6_sock_mc_drop); 314 315 static struct inet6_dev *ip6_mc_find_idev(struct net *net, 316 const struct in6_addr *group, 317 int ifindex) 318 { 319 struct net_device *dev; 320 struct inet6_dev *idev; 321 322 dev = ip6_mc_find_dev(net, group, ifindex); 323 if (!dev) 324 return NULL; 325 326 idev = in6_dev_get(dev); 327 dev_put(dev); 328 329 return idev; 330 } 331 332 void __ipv6_sock_mc_close(struct sock *sk) 333 { 334 struct ipv6_pinfo *np = inet6_sk(sk); 335 struct ipv6_mc_socklist *mc_lst; 336 337 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) { 338 rcu_assign_pointer(np->ipv6_mc_list, 339 sock_dereference(mc_lst->next, sk)); 340 __ipv6_sock_mc_drop(sk, mc_lst); 341 } 342 } 343 344 void ipv6_sock_mc_close(struct sock *sk) 345 { 346 struct ipv6_pinfo *np = inet6_sk(sk); 347 348 if (!rcu_access_pointer(np->ipv6_mc_list)) 349 return; 350 351 lock_sock(sk); 352 __ipv6_sock_mc_close(sk); 353 release_sock(sk); 354 } 355 356 int ip6_mc_source(int add, int omode, struct sock *sk, 357 struct group_source_req *pgsr) 358 { 359 struct ipv6_pinfo *inet6 = inet6_sk(sk); 360 struct in6_addr *source, *group; 361 struct ip6_sf_socklist *newpsl, *psl; 362 struct net *net = sock_net(sk); 363 struct ipv6_mc_socklist *pmc; 364 struct inet6_dev *idev; 365 int leavegroup = 0; 366 int i, j; 367 int err; 368 369 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 370 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 371 372 if (!ipv6_addr_is_multicast(group)) 373 return -EINVAL; 374 375 idev = ip6_mc_find_idev(net, group, pgsr->gsr_interface); 376 if (!idev) 377 return -ENODEV; 378 379 mutex_lock(&idev->mc_lock); 380 381 if (idev->dead) { 382 err = -ENODEV; 383 goto done; 384 } 385 386 err = -EADDRNOTAVAIL; 387 388 for_each_pmc_socklock(inet6, sk, pmc) { 389 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 390 continue; 391 if (ipv6_addr_equal(&pmc->addr, group)) 392 break; 393 } 394 if (!pmc) { /* must have a prior join */ 395 err = -EINVAL; 396 goto done; 397 } 398 /* if a source filter was set, must be the same mode as before */ 399 if (rcu_access_pointer(pmc->sflist)) { 400 if (pmc->sfmode != omode) { 401 err = -EINVAL; 402 goto done; 403 } 404 } else if (pmc->sfmode != omode) { 405 /* allow mode switches for empty-set filters */ 406 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 407 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 408 pmc->sfmode = omode; 409 } 410 411 psl = sock_dereference(pmc->sflist, sk); 412 if (!add) { 413 if (!psl) 414 goto done; /* err = -EADDRNOTAVAIL */ 415 for (i = 0; i < psl->sl_count; i++) { 416 if (ipv6_addr_equal(&psl->sl_addr[i], source)) 417 break; 418 } 419 if (i == psl->sl_count) /* source not found */ 420 goto done; /* err = -EADDRNOTAVAIL */ 421 422 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 423 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 424 leavegroup = 1; 425 goto done; 426 } 427 428 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 429 &sk->sk_omem_alloc); 430 431 if (psl->sl_count == 1) { 432 newpsl = NULL; 433 } else { 434 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, 435 psl->sl_count - 1), 436 GFP_KERNEL); 437 if (!newpsl) { 438 atomic_add(struct_size(psl, sl_addr, psl->sl_max), 439 &sk->sk_omem_alloc); 440 err = -ENOBUFS; 441 goto done; 442 } 443 newpsl->sl_max = psl->sl_count - 1; 444 newpsl->sl_count = psl->sl_count - 1; 445 for (j = 0; j < i; j++) 446 newpsl->sl_addr[j] = psl->sl_addr[j]; 447 for (j = i + 1; j < psl->sl_count; j++) 448 newpsl->sl_addr[j - 1] = psl->sl_addr[j]; 449 } 450 451 /* update the interface filter */ 452 ip6_mc_del_src(idev, group, omode, 1, source, 1); 453 454 rcu_assign_pointer(pmc->sflist, newpsl); 455 kfree_rcu(psl, rcu); 456 err = 0; 457 goto done; 458 } 459 /* else, add a new source to the filter */ 460 461 if (psl && psl->sl_count >= READ_ONCE(sysctl_mld_max_msf)) { 462 err = -ENOBUFS; 463 goto done; 464 } 465 if (psl) { 466 for (i = 0; i < psl->sl_count; i++) { 467 if (ipv6_addr_equal(&psl->sl_addr[i], source)) 468 goto done; /* err = -EADDRNOTAVAIL */ 469 } 470 } 471 472 i = psl ? psl->sl_count + 1 : 1; 473 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, i), 474 GFP_KERNEL); 475 if (!newpsl) { 476 err = -ENOBUFS; 477 goto done; 478 } 479 newpsl->sl_max = i; 480 newpsl->sl_count = i; 481 if (psl) { 482 for (j = 0; j < psl->sl_count; j++) 483 newpsl->sl_addr[j] = psl->sl_addr[j]; 484 } 485 newpsl->sl_addr[i - 1] = *source; 486 487 /* update the interface list */ 488 ip6_mc_add_src(idev, group, omode, 1, source, 1); 489 490 if (psl) 491 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 492 &sk->sk_omem_alloc); 493 rcu_assign_pointer(pmc->sflist, newpsl); 494 kfree_rcu(psl, rcu); 495 err = 0; 496 done: 497 mutex_unlock(&idev->mc_lock); 498 in6_dev_put(idev); 499 if (leavegroup) 500 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 501 return err; 502 } 503 504 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 505 struct sockaddr_storage *list) 506 { 507 struct ipv6_pinfo *inet6 = inet6_sk(sk); 508 struct ip6_sf_socklist *newpsl, *psl; 509 struct net *net = sock_net(sk); 510 const struct in6_addr *group; 511 struct ipv6_mc_socklist *pmc; 512 struct inet6_dev *idev; 513 int leavegroup = 0; 514 int i, err; 515 516 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 517 518 if (!ipv6_addr_is_multicast(group)) 519 return -EINVAL; 520 if (gsf->gf_fmode != MCAST_INCLUDE && 521 gsf->gf_fmode != MCAST_EXCLUDE) 522 return -EINVAL; 523 524 idev = ip6_mc_find_idev(net, group, gsf->gf_interface); 525 if (!idev) 526 return -ENODEV; 527 528 mutex_lock(&idev->mc_lock); 529 530 if (idev->dead) { 531 err = -ENODEV; 532 goto done; 533 } 534 535 err = 0; 536 537 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 538 leavegroup = 1; 539 goto done; 540 } 541 542 for_each_pmc_socklock(inet6, sk, pmc) { 543 if (pmc->ifindex != gsf->gf_interface) 544 continue; 545 if (ipv6_addr_equal(&pmc->addr, group)) 546 break; 547 } 548 if (!pmc) { /* must have a prior join */ 549 err = -EINVAL; 550 goto done; 551 } 552 if (gsf->gf_numsrc) { 553 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, 554 gsf->gf_numsrc), 555 GFP_KERNEL); 556 if (!newpsl) { 557 err = -ENOBUFS; 558 goto done; 559 } 560 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 561 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 562 struct sockaddr_in6 *psin6; 563 564 psin6 = (struct sockaddr_in6 *)list; 565 newpsl->sl_addr[i] = psin6->sin6_addr; 566 } 567 568 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 569 newpsl->sl_count, newpsl->sl_addr, 0); 570 if (err) { 571 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr, 572 newpsl->sl_max)); 573 goto done; 574 } 575 } else { 576 newpsl = NULL; 577 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 578 } 579 580 psl = sock_dereference(pmc->sflist, sk); 581 if (psl) { 582 ip6_mc_del_src(idev, group, pmc->sfmode, 583 psl->sl_count, psl->sl_addr, 0); 584 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 585 &sk->sk_omem_alloc); 586 } else { 587 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 588 } 589 590 rcu_assign_pointer(pmc->sflist, newpsl); 591 kfree_rcu(psl, rcu); 592 pmc->sfmode = gsf->gf_fmode; 593 err = 0; 594 done: 595 mutex_unlock(&idev->mc_lock); 596 in6_dev_put(idev); 597 if (leavegroup) 598 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 599 return err; 600 } 601 602 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 603 sockptr_t optval, size_t ss_offset) 604 { 605 struct ipv6_pinfo *inet6 = inet6_sk(sk); 606 const struct in6_addr *group; 607 struct ipv6_mc_socklist *pmc; 608 struct ip6_sf_socklist *psl; 609 unsigned int count; 610 int i, copycount; 611 612 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 613 614 if (!ipv6_addr_is_multicast(group)) 615 return -EINVAL; 616 617 for_each_pmc_socklock(inet6, sk, pmc) { 618 if (pmc->ifindex != gsf->gf_interface) 619 continue; 620 if (ipv6_addr_equal(group, &pmc->addr)) 621 break; 622 } 623 if (!pmc) /* must have a prior join */ 624 return -EADDRNOTAVAIL; 625 626 gsf->gf_fmode = pmc->sfmode; 627 psl = sock_dereference(pmc->sflist, sk); 628 count = psl ? psl->sl_count : 0; 629 630 copycount = min(count, gsf->gf_numsrc); 631 gsf->gf_numsrc = count; 632 for (i = 0; i < copycount; i++) { 633 struct sockaddr_in6 *psin6; 634 struct sockaddr_storage ss; 635 636 psin6 = (struct sockaddr_in6 *)&ss; 637 memset(&ss, 0, sizeof(ss)); 638 psin6->sin6_family = AF_INET6; 639 psin6->sin6_addr = psl->sl_addr[i]; 640 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss))) 641 return -EFAULT; 642 ss_offset += sizeof(ss); 643 } 644 return 0; 645 } 646 647 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, 648 const struct in6_addr *src_addr) 649 { 650 const struct ipv6_pinfo *np = inet6_sk(sk); 651 const struct ipv6_mc_socklist *mc; 652 const struct ip6_sf_socklist *psl; 653 bool rv = true; 654 655 rcu_read_lock(); 656 for_each_pmc_rcu(np, mc) { 657 if (ipv6_addr_equal(&mc->addr, mc_addr)) 658 break; 659 } 660 if (!mc) { 661 rcu_read_unlock(); 662 return inet6_test_bit(MC6_ALL, sk); 663 } 664 psl = rcu_dereference(mc->sflist); 665 if (!psl) { 666 rv = mc->sfmode == MCAST_EXCLUDE; 667 } else { 668 int i; 669 670 for (i = 0; i < psl->sl_count; i++) { 671 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 672 break; 673 } 674 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 675 rv = false; 676 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 677 rv = false; 678 } 679 rcu_read_unlock(); 680 681 return rv; 682 } 683 684 static void igmp6_group_added(struct ifmcaddr6 *mc) 685 { 686 struct net_device *dev = mc->idev->dev; 687 char buf[MAX_ADDR_LEN]; 688 689 mc_assert_locked(mc->idev); 690 691 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 692 IPV6_ADDR_SCOPE_LINKLOCAL) 693 return; 694 695 if (!(mc->mca_flags&MAF_LOADED)) { 696 WRITE_ONCE(mc->mca_flags, mc->mca_flags | MAF_LOADED); 697 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 698 dev_mc_add(dev, buf); 699 } 700 701 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 702 return; 703 704 if (mld_in_v1_mode(mc->idev)) { 705 igmp6_join_group(mc); 706 return; 707 } 708 /* else v2 */ 709 710 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 711 * should not send filter-mode change record as the mode 712 * should be from IN() to IN(A). 713 */ 714 if (mc->mca_sfmode == MCAST_EXCLUDE) 715 mc->mca_crcount = mc->idev->mc_qrv; 716 717 mld_ifc_event(mc->idev); 718 } 719 720 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 721 { 722 struct net_device *dev = mc->idev->dev; 723 char buf[MAX_ADDR_LEN]; 724 725 mc_assert_locked(mc->idev); 726 727 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 728 IPV6_ADDR_SCOPE_LINKLOCAL) 729 return; 730 731 if (mc->mca_flags&MAF_LOADED) { 732 WRITE_ONCE(mc->mca_flags, mc->mca_flags & ~MAF_LOADED); 733 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 734 dev_mc_del(dev, buf); 735 } 736 737 if (mc->mca_flags & MAF_NOREPORT) 738 return; 739 740 if (!mc->idev->dead) 741 igmp6_leave_group(mc); 742 743 if (cancel_delayed_work(&mc->mca_work)) 744 refcount_dec(&mc->mca_refcnt); 745 } 746 747 /* deleted ifmcaddr6 manipulation */ 748 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 749 { 750 struct ifmcaddr6 *pmc; 751 752 mc_assert_locked(idev); 753 754 /* this is an "ifmcaddr6" for convenience; only the fields below 755 * are actually used. In particular, the refcnt and users are not 756 * used for management of the delete list. Using the same structure 757 * for deleted items allows change reports to use common code with 758 * non-deleted or query-response MCA's. 759 */ 760 pmc = kzalloc_obj(*pmc); 761 if (!pmc) 762 return; 763 764 pmc->idev = im->idev; 765 in6_dev_hold(idev); 766 pmc->mca_addr = im->mca_addr; 767 pmc->mca_crcount = idev->mc_qrv; 768 pmc->mca_sfmode = im->mca_sfmode; 769 if (pmc->mca_sfmode == MCAST_INCLUDE) { 770 struct ip6_sf_list *psf; 771 772 rcu_assign_pointer(pmc->mca_tomb, 773 mc_dereference(im->mca_tomb, idev)); 774 rcu_assign_pointer(pmc->mca_sources, 775 mc_dereference(im->mca_sources, idev)); 776 RCU_INIT_POINTER(im->mca_tomb, NULL); 777 RCU_INIT_POINTER(im->mca_sources, NULL); 778 779 for_each_psf_mclock(pmc, psf) 780 psf->sf_crcount = pmc->mca_crcount; 781 } 782 783 rcu_assign_pointer(pmc->next, idev->mc_tomb); 784 rcu_assign_pointer(idev->mc_tomb, pmc); 785 } 786 787 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 788 { 789 struct ip6_sf_list *psf, *sources, *tomb; 790 struct in6_addr *pmca = &im->mca_addr; 791 struct ifmcaddr6 *pmc, *pmc_prev; 792 793 mc_assert_locked(idev); 794 795 pmc_prev = NULL; 796 for_each_mc_tomb(idev, pmc) { 797 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 798 break; 799 pmc_prev = pmc; 800 } 801 if (!pmc) 802 return; 803 if (pmc_prev) 804 rcu_assign_pointer(pmc_prev->next, 805 mc_dereference(pmc->next, idev)); 806 else 807 rcu_assign_pointer(idev->mc_tomb, 808 mc_dereference(pmc->next, idev)); 809 810 im->idev = pmc->idev; 811 if (im->mca_sfmode == MCAST_INCLUDE) { 812 tomb = rcu_replace_pointer(im->mca_tomb, 813 mc_dereference(pmc->mca_tomb, pmc->idev), 814 lockdep_is_held(&im->idev->mc_lock)); 815 rcu_assign_pointer(pmc->mca_tomb, tomb); 816 817 sources = rcu_replace_pointer(im->mca_sources, 818 mc_dereference(pmc->mca_sources, pmc->idev), 819 lockdep_is_held(&im->idev->mc_lock)); 820 rcu_assign_pointer(pmc->mca_sources, sources); 821 for_each_psf_mclock(im, psf) 822 psf->sf_crcount = idev->mc_qrv; 823 } else { 824 im->mca_crcount = idev->mc_qrv; 825 } 826 ip6_mc_clear_src(pmc); 827 in6_dev_put(pmc->idev); 828 kfree_rcu(pmc, rcu); 829 } 830 831 static void mld_clear_delrec(struct inet6_dev *idev) 832 { 833 struct ifmcaddr6 *pmc, *nextpmc; 834 835 mc_assert_locked(idev); 836 837 pmc = mc_dereference(idev->mc_tomb, idev); 838 RCU_INIT_POINTER(idev->mc_tomb, NULL); 839 840 for (; pmc; pmc = nextpmc) { 841 nextpmc = mc_dereference(pmc->next, idev); 842 ip6_mc_clear_src(pmc); 843 in6_dev_put(pmc->idev); 844 kfree_rcu(pmc, rcu); 845 } 846 847 /* clear dead sources, too */ 848 for_each_mc_mclock(idev, pmc) { 849 struct ip6_sf_list *psf, *psf_next; 850 851 psf = mc_dereference(pmc->mca_tomb, idev); 852 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 853 for (; psf; psf = psf_next) { 854 psf_next = mc_dereference(psf->sf_next, idev); 855 kfree_rcu(psf, rcu); 856 } 857 } 858 } 859 860 static void mld_clear_query(struct inet6_dev *idev) 861 { 862 spin_lock_bh(&idev->mc_query_lock); 863 __skb_queue_purge(&idev->mc_query_queue); 864 spin_unlock_bh(&idev->mc_query_lock); 865 } 866 867 static void mld_clear_report(struct inet6_dev *idev) 868 { 869 spin_lock_bh(&idev->mc_report_lock); 870 __skb_queue_purge(&idev->mc_report_queue); 871 spin_unlock_bh(&idev->mc_report_lock); 872 } 873 874 static void ma_put(struct ifmcaddr6 *mc) 875 { 876 if (refcount_dec_and_test(&mc->mca_refcnt)) { 877 in6_dev_put(mc->idev); 878 kfree_rcu(mc, rcu); 879 } 880 } 881 882 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 883 const struct in6_addr *addr, 884 unsigned int mode) 885 { 886 struct ifmcaddr6 *mc; 887 888 mc_assert_locked(idev); 889 890 mc = kzalloc_obj(*mc); 891 if (!mc) 892 return NULL; 893 894 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 895 896 mc->mca_addr = *addr; 897 mc->idev = idev; /* reference taken by caller */ 898 WRITE_ONCE(mc->mca_users, 1); 899 /* mca_stamp should be updated upon changes */ 900 mc->mca_cstamp = mc->mca_tstamp = jiffies; 901 refcount_set(&mc->mca_refcnt, 1); 902 903 mc->mca_sfmode = mode; 904 mc->mca_sfcount[mode] = 1; 905 906 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 907 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 908 WRITE_ONCE(mc->mca_flags, mc->mca_flags | MAF_NOREPORT); 909 910 return mc; 911 } 912 913 static void inet6_ifmcaddr_notify(struct net_device *dev, 914 const struct ifmcaddr6 *ifmca, int event) 915 { 916 struct inet6_fill_args fillargs = { 917 .portid = 0, 918 .seq = 0, 919 .event = event, 920 .flags = 0, 921 .netnsid = -1, 922 .force_rt_scope_universe = true, 923 }; 924 struct net *net = dev_net(dev); 925 struct sk_buff *skb; 926 int err = -ENOMEM; 927 928 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + 929 nla_total_size(sizeof(struct in6_addr)) + 930 nla_total_size(sizeof(u32)) + 931 nla_total_size(sizeof(struct ifa_cacheinfo)), 932 GFP_KERNEL); 933 if (!skb) 934 goto error; 935 936 err = inet6_fill_ifmcaddr(skb, ifmca, &fillargs); 937 if (err < 0) { 938 WARN_ON_ONCE(err == -EMSGSIZE); 939 nlmsg_free(skb); 940 goto error; 941 } 942 943 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MCADDR, NULL, GFP_KERNEL); 944 return; 945 error: 946 rtnl_set_sk_err(net, RTNLGRP_IPV6_MCADDR, err); 947 } 948 949 /* 950 * device multicast group inc (add if not found) 951 */ 952 static int __ipv6_dev_mc_inc(struct net_device *dev, 953 const struct in6_addr *addr, unsigned int mode) 954 { 955 struct inet6_dev *idev; 956 struct ifmcaddr6 *mc; 957 958 /* we need to take a reference on idev */ 959 idev = in6_dev_get(dev); 960 if (!idev) 961 return -EINVAL; 962 963 mutex_lock(&idev->mc_lock); 964 965 if (READ_ONCE(idev->dead)) { 966 mutex_unlock(&idev->mc_lock); 967 in6_dev_put(idev); 968 return -ENODEV; 969 } 970 971 for_each_mc_mclock(idev, mc) { 972 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 973 WRITE_ONCE(mc->mca_users, mc->mca_users + 1); 974 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 975 mutex_unlock(&idev->mc_lock); 976 in6_dev_put(idev); 977 return 0; 978 } 979 } 980 981 mc = mca_alloc(idev, addr, mode); 982 if (!mc) { 983 mutex_unlock(&idev->mc_lock); 984 in6_dev_put(idev); 985 return -ENOMEM; 986 } 987 988 rcu_assign_pointer(mc->next, mc_dereference(idev->mc_list, idev)); 989 rcu_assign_pointer(idev->mc_list, mc); 990 991 mld_del_delrec(idev, mc); 992 igmp6_group_added(mc); 993 inet6_ifmcaddr_notify(dev, mc, RTM_NEWMULTICAST); 994 mutex_unlock(&idev->mc_lock); 995 996 return 0; 997 } 998 999 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 1000 { 1001 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 1002 } 1003 EXPORT_SYMBOL(ipv6_dev_mc_inc); 1004 1005 /* 1006 * device multicast group del 1007 */ 1008 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 1009 { 1010 struct ifmcaddr6 *ma, __rcu **map; 1011 1012 mutex_lock(&idev->mc_lock); 1013 1014 for (map = &idev->mc_list; 1015 (ma = mc_dereference(*map, idev)); 1016 map = &ma->next) { 1017 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 1018 int new_users = ma->mca_users - 1; 1019 1020 WRITE_ONCE(ma->mca_users, new_users); 1021 if (new_users == 0) { 1022 rcu_assign_pointer(*map, 1023 mc_dereference(ma->next, idev)); 1024 1025 igmp6_group_dropped(ma); 1026 inet6_ifmcaddr_notify(idev->dev, ma, 1027 RTM_DELMULTICAST); 1028 ip6_mc_clear_src(ma); 1029 mutex_unlock(&idev->mc_lock); 1030 1031 ma_put(ma); 1032 return 0; 1033 } 1034 mutex_unlock(&idev->mc_lock); 1035 return 0; 1036 } 1037 } 1038 1039 mutex_unlock(&idev->mc_lock); 1040 return -ENOENT; 1041 } 1042 1043 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 1044 { 1045 struct inet6_dev *idev; 1046 int err; 1047 1048 idev = in6_dev_get(dev); 1049 if (!idev) 1050 return -ENODEV; 1051 1052 err = __ipv6_dev_mc_dec(idev, addr); 1053 in6_dev_put(idev); 1054 1055 return err; 1056 } 1057 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1058 1059 /* 1060 * check if the interface/address pair is valid 1061 */ 1062 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1063 const struct in6_addr *src_addr) 1064 { 1065 struct inet6_dev *idev; 1066 struct ifmcaddr6 *mc; 1067 bool rv = false; 1068 1069 rcu_read_lock(); 1070 idev = __in6_dev_get(dev); 1071 if (!idev) 1072 goto unlock; 1073 for_each_mc_rcu(idev, mc) { 1074 if (ipv6_addr_equal(&mc->mca_addr, group)) 1075 break; 1076 } 1077 if (!mc) 1078 goto unlock; 1079 if (src_addr && !ipv6_addr_any(src_addr)) { 1080 struct ip6_sf_list *psf; 1081 1082 for_each_psf_rcu(mc, psf) { 1083 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1084 break; 1085 } 1086 if (psf) 1087 rv = READ_ONCE(psf->sf_count[MCAST_INCLUDE]) || 1088 READ_ONCE(psf->sf_count[MCAST_EXCLUDE]) != 1089 READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]); 1090 else 1091 rv = READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]) != 0; 1092 } else { 1093 rv = true; /* don't filter unspecified source */ 1094 } 1095 unlock: 1096 rcu_read_unlock(); 1097 return rv; 1098 } 1099 1100 static void mld_gq_start_work(struct inet6_dev *idev) 1101 { 1102 unsigned long tv = get_random_u32_below(idev->mc_maxdelay); 1103 1104 mc_assert_locked(idev); 1105 1106 idev->mc_gq_running = 1; 1107 if (in6_dev_hold_safe(idev)) { 1108 if (mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1109 in6_dev_put(idev); 1110 } 1111 } 1112 1113 static void mld_gq_stop_work(struct inet6_dev *idev) 1114 { 1115 mc_assert_locked(idev); 1116 1117 idev->mc_gq_running = 0; 1118 if (cancel_delayed_work(&idev->mc_gq_work)) 1119 __in6_dev_put(idev); 1120 } 1121 1122 static void mld_ifc_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_ifc_work, tv + 2)) 1130 in6_dev_put(idev); 1131 } 1132 } 1133 1134 static void mld_ifc_stop_work(struct inet6_dev *idev) 1135 { 1136 mc_assert_locked(idev); 1137 1138 idev->mc_ifc_count = 0; 1139 if (cancel_delayed_work(&idev->mc_ifc_work)) 1140 __in6_dev_put(idev); 1141 } 1142 1143 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1144 { 1145 unsigned long tv = get_random_u32_below(delay); 1146 1147 mc_assert_locked(idev); 1148 1149 if (in6_dev_hold_safe(idev)) { 1150 if (mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1151 in6_dev_put(idev); 1152 } 1153 } 1154 1155 static void mld_dad_stop_work(struct inet6_dev *idev) 1156 { 1157 if (cancel_delayed_work(&idev->mc_dad_work)) 1158 __in6_dev_put(idev); 1159 } 1160 1161 static void mld_query_stop_work(struct inet6_dev *idev) 1162 { 1163 spin_lock_bh(&idev->mc_query_lock); 1164 if (cancel_delayed_work(&idev->mc_query_work)) 1165 __in6_dev_put(idev); 1166 spin_unlock_bh(&idev->mc_query_lock); 1167 } 1168 1169 static void mld_report_stop_work(struct inet6_dev *idev) 1170 { 1171 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1172 __in6_dev_put(idev); 1173 } 1174 1175 /* IGMP handling (alias multicast ICMPv6 messages) */ 1176 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1177 { 1178 unsigned long delay = resptime; 1179 1180 mc_assert_locked(ma->idev); 1181 1182 /* Do not start work for these addresses */ 1183 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1184 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1185 return; 1186 1187 if (cancel_delayed_work(&ma->mca_work)) { 1188 refcount_dec(&ma->mca_refcnt); 1189 delay = ma->mca_work.timer.expires - jiffies; 1190 } 1191 1192 if (delay >= resptime) 1193 delay = get_random_u32_below(resptime); 1194 1195 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1196 refcount_inc(&ma->mca_refcnt); 1197 WRITE_ONCE(ma->mca_flags, ma->mca_flags | MAF_TIMER_RUNNING); 1198 } 1199 1200 /* mark EXCLUDE-mode sources */ 1201 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1202 const struct in6_addr *srcs) 1203 { 1204 struct ip6_sf_list *psf; 1205 int i, scount; 1206 1207 mc_assert_locked(pmc->idev); 1208 1209 scount = 0; 1210 for_each_psf_mclock(pmc, psf) { 1211 if (scount == nsrcs) 1212 break; 1213 for (i = 0; i < nsrcs; i++) { 1214 /* skip inactive filters */ 1215 if (psf->sf_count[MCAST_INCLUDE] || 1216 pmc->mca_sfcount[MCAST_EXCLUDE] != 1217 psf->sf_count[MCAST_EXCLUDE]) 1218 break; 1219 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1220 scount++; 1221 break; 1222 } 1223 } 1224 } 1225 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 1226 if (scount == nsrcs) /* all sources excluded */ 1227 return false; 1228 return true; 1229 } 1230 1231 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1232 const struct in6_addr *srcs) 1233 { 1234 struct ip6_sf_list *psf; 1235 int i, scount; 1236 1237 mc_assert_locked(pmc->idev); 1238 1239 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1240 return mld_xmarksources(pmc, nsrcs, srcs); 1241 1242 /* mark INCLUDE-mode sources */ 1243 1244 scount = 0; 1245 for_each_psf_mclock(pmc, psf) { 1246 if (scount == nsrcs) 1247 break; 1248 for (i = 0; i < nsrcs; i++) { 1249 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1250 psf->sf_gsresp = 1; 1251 scount++; 1252 break; 1253 } 1254 } 1255 } 1256 if (!scount) { 1257 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 1258 return false; 1259 } 1260 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags | MAF_GSQUERY); 1261 return true; 1262 } 1263 1264 static int mld_force_mld_version(const struct inet6_dev *idev) 1265 { 1266 const struct net *net = dev_net(idev->dev); 1267 int all_force; 1268 1269 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1270 /* Normally, both are 0 here. If enforcement to a particular is 1271 * being used, individual device enforcement will have a lower 1272 * precedence over 'all' device (.../conf/all/force_mld_version). 1273 */ 1274 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1275 } 1276 1277 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1278 { 1279 return mld_force_mld_version(idev) == 2; 1280 } 1281 1282 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1283 { 1284 return mld_force_mld_version(idev) == 1; 1285 } 1286 1287 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1288 { 1289 if (mld_in_v2_mode_only(idev)) 1290 return false; 1291 if (mld_in_v1_mode_only(idev)) 1292 return true; 1293 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1294 return true; 1295 1296 return false; 1297 } 1298 1299 static void mld_set_v1_mode(struct inet6_dev *idev) 1300 { 1301 /* RFC3810, relevant sections: 1302 * - 9.1. Robustness Variable 1303 * - 9.2. Query Interval 1304 * - 9.3. Query Response Interval 1305 * - 9.12. Older Version Querier Present Timeout 1306 */ 1307 unsigned long switchback; 1308 1309 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1310 1311 idev->mc_v1_seen = jiffies + switchback; 1312 } 1313 1314 static void mld_update_qrv(struct inet6_dev *idev, 1315 const struct mld2_query *mlh2) 1316 { 1317 /* RFC3810, relevant sections: 1318 * - 5.1.8. QRV (Querier's Robustness Variable) 1319 * - 9.1. Robustness Variable 1320 */ 1321 1322 /* The value of the Robustness Variable MUST NOT be zero, 1323 * and SHOULD NOT be one. Catch this here if we ever run 1324 * into such a case in future. 1325 */ 1326 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1327 WARN_ON(idev->mc_qrv == 0); 1328 1329 if (mlh2->mld2q_qrv > 0) 1330 idev->mc_qrv = mlh2->mld2q_qrv; 1331 1332 if (unlikely(idev->mc_qrv < min_qrv)) { 1333 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1334 idev->mc_qrv, min_qrv); 1335 idev->mc_qrv = min_qrv; 1336 } 1337 } 1338 1339 static void mld_update_qi(struct inet6_dev *idev, 1340 const struct mld2_query *mlh2) 1341 { 1342 /* RFC3810, relevant sections: 1343 * - 5.1.9. QQIC (Querier's Query Interval Code) 1344 * - 9.2. Query Interval 1345 * - 9.12. Older Version Querier Present Timeout 1346 * (the [Query Interval] in the last Query received) 1347 */ 1348 idev->mc_qi = mldv2_qqi(mlh2) * HZ; 1349 } 1350 1351 static void mld_update_qri(struct inet6_dev *idev, 1352 const struct mld2_query *mlh2) 1353 { 1354 /* RFC3810, relevant sections: 1355 * - 5.1.3. Maximum Response Code 1356 * - 9.3. Query Response Interval 1357 */ 1358 idev->mc_qri = msecs_to_jiffies(mldv2_mrd(mlh2)); 1359 } 1360 1361 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1362 unsigned long *max_delay, bool v1_query) 1363 { 1364 unsigned long mldv1_md; 1365 1366 /* Ignore v1 queries */ 1367 if (mld_in_v2_mode_only(idev)) 1368 return -EINVAL; 1369 1370 mldv1_md = ntohs(mld->mld_maxdelay); 1371 1372 /* When in MLDv1 fallback and a MLDv2 router start-up being 1373 * unaware of current MLDv1 operation, the MRC == MRD mapping 1374 * only works when the exponential algorithm is not being 1375 * used (as MLDv1 is unaware of such things). 1376 * 1377 * According to the RFC author, the MLDv2 implementations 1378 * he's aware of all use a MRC < 32768 on start up queries. 1379 * 1380 * Thus, should we *ever* encounter something else larger 1381 * than that, just assume the maximum possible within our 1382 * reach. 1383 */ 1384 if (!v1_query) 1385 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1386 1387 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1388 1389 /* MLDv1 router present: we need to go into v1 mode *only* 1390 * when an MLDv1 query is received as per section 9.12. of 1391 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1392 * queries MUST be of exactly 24 octets. 1393 */ 1394 if (v1_query) 1395 mld_set_v1_mode(idev); 1396 1397 /* cancel MLDv2 report work */ 1398 mld_gq_stop_work(idev); 1399 /* cancel the interface change work */ 1400 mld_ifc_stop_work(idev); 1401 /* clear deleted report items */ 1402 mld_clear_delrec(idev); 1403 1404 return 0; 1405 } 1406 1407 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1408 unsigned long *max_delay) 1409 { 1410 *max_delay = max(msecs_to_jiffies(mldv2_mrd(mld)), 1UL); 1411 1412 mld_update_qrv(idev, mld); 1413 mld_update_qi(idev, mld); 1414 mld_update_qri(idev, mld); 1415 1416 idev->mc_maxdelay = *max_delay; 1417 1418 return; 1419 } 1420 1421 /* called with rcu_read_lock() */ 1422 void igmp6_event_query(struct sk_buff *skb) 1423 { 1424 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1425 bool put = false; 1426 1427 if (!idev || idev->dead) 1428 goto out; 1429 1430 spin_lock_bh(&idev->mc_query_lock); 1431 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS && 1432 in6_dev_hold_safe(idev)) { 1433 __skb_queue_tail(&idev->mc_query_queue, skb); 1434 if (mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1435 put = true; 1436 skb = NULL; 1437 } 1438 spin_unlock_bh(&idev->mc_query_lock); 1439 1440 if (put) 1441 in6_dev_put(idev); 1442 out: 1443 kfree_skb(skb); 1444 } 1445 1446 static void __mld_query_work(struct sk_buff *skb) 1447 { 1448 struct mld2_query *mlh2 = NULL; 1449 unsigned long max_delay; 1450 struct inet6_dev *idev; 1451 struct in6_addr group; 1452 struct ifmcaddr6 *ma; 1453 struct mld_msg *mld; 1454 int group_type; 1455 int mark = 0; 1456 int len, err; 1457 1458 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1459 goto kfree_skb; 1460 1461 /* compute payload length excluding extension headers */ 1462 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1463 len -= skb_network_header_len(skb); 1464 1465 /* RFC3810 6.2 1466 * Upon reception of an MLD message that contains a Query, the node 1467 * checks if the source address of the message is a valid link-local 1468 * address, if the Hop Limit is set to 1, and if the Router Alert 1469 * option is present in the Hop-By-Hop Options header of the IPv6 1470 * packet. If any of these checks fails, the packet is dropped. 1471 */ 1472 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1473 ipv6_hdr(skb)->hop_limit != 1 || 1474 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1475 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1476 goto kfree_skb; 1477 1478 idev = in6_dev_get(skb->dev); 1479 if (!idev) 1480 goto kfree_skb; 1481 1482 mld = (struct mld_msg *)icmp6_hdr(skb); 1483 group = mld->mld_mca; 1484 group_type = ipv6_addr_type(&group); 1485 1486 if (group_type != IPV6_ADDR_ANY && 1487 !(group_type&IPV6_ADDR_MULTICAST)) 1488 goto out; 1489 1490 if (len < MLD_V1_QUERY_LEN) { 1491 goto out; 1492 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1493 err = mld_process_v1(idev, mld, &max_delay, 1494 len == MLD_V1_QUERY_LEN); 1495 if (err < 0) 1496 goto out; 1497 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1498 int srcs_offset = sizeof(struct mld2_query) - 1499 sizeof(struct icmp6hdr); 1500 1501 if (!pskb_may_pull(skb, srcs_offset)) 1502 goto out; 1503 1504 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1505 1506 mld_process_v2(idev, mlh2, &max_delay); 1507 1508 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1509 if (mlh2->mld2q_nsrcs) 1510 goto out; /* no sources allowed */ 1511 1512 mld_gq_start_work(idev); 1513 goto out; 1514 } 1515 /* mark sources to include, if group & source-specific */ 1516 if (mlh2->mld2q_nsrcs != 0) { 1517 if (!pskb_may_pull(skb, srcs_offset + 1518 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1519 goto out; 1520 1521 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1522 mark = 1; 1523 } 1524 } else { 1525 goto out; 1526 } 1527 1528 if (group_type == IPV6_ADDR_ANY) { 1529 for_each_mc_mclock(idev, ma) { 1530 igmp6_group_queried(ma, max_delay); 1531 } 1532 } else { 1533 for_each_mc_mclock(idev, ma) { 1534 unsigned int flags; 1535 1536 if (!ipv6_addr_equal(&group, &ma->mca_addr)) 1537 continue; 1538 flags = ma->mca_flags; 1539 1540 if (flags & MAF_TIMER_RUNNING) { 1541 /* gsquery <- gsquery && mark */ 1542 if (!mark) 1543 WRITE_ONCE(ma->mca_flags, 1544 flags & ~MAF_GSQUERY); 1545 } else { 1546 /* gsquery <- mark */ 1547 if (mark) 1548 WRITE_ONCE(ma->mca_flags, 1549 flags | MAF_GSQUERY); 1550 else 1551 WRITE_ONCE(ma->mca_flags, 1552 flags & ~MAF_GSQUERY); 1553 } 1554 if (!(ma->mca_flags & MAF_GSQUERY) || 1555 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1556 igmp6_group_queried(ma, max_delay); 1557 break; 1558 } 1559 } 1560 1561 out: 1562 in6_dev_put(idev); 1563 kfree_skb: 1564 consume_skb(skb); 1565 } 1566 1567 static void mld_query_work(struct work_struct *work) 1568 { 1569 struct inet6_dev *idev = container_of(to_delayed_work(work), 1570 struct inet6_dev, 1571 mc_query_work); 1572 struct sk_buff_head q; 1573 struct sk_buff *skb; 1574 bool rework = false; 1575 int cnt = 0; 1576 1577 skb_queue_head_init(&q); 1578 1579 spin_lock_bh(&idev->mc_query_lock); 1580 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1581 __skb_queue_tail(&q, skb); 1582 1583 if (++cnt >= MLD_MAX_QUEUE) { 1584 rework = true; 1585 break; 1586 } 1587 } 1588 spin_unlock_bh(&idev->mc_query_lock); 1589 1590 mutex_lock(&idev->mc_lock); 1591 while ((skb = __skb_dequeue(&q))) 1592 __mld_query_work(skb); 1593 mutex_unlock(&idev->mc_lock); 1594 1595 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1596 return; 1597 1598 in6_dev_put(idev); 1599 } 1600 1601 /* called with rcu_read_lock() */ 1602 void igmp6_event_report(struct sk_buff *skb) 1603 { 1604 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1605 bool put = false; 1606 1607 if (!idev || idev->dead) 1608 goto out; 1609 1610 spin_lock_bh(&idev->mc_report_lock); 1611 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS && 1612 in6_dev_hold_safe(idev)) { 1613 __skb_queue_tail(&idev->mc_report_queue, skb); 1614 if (mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1615 put = true; 1616 skb = NULL; 1617 } 1618 spin_unlock_bh(&idev->mc_report_lock); 1619 1620 if (put) 1621 in6_dev_put(idev); 1622 out: 1623 kfree_skb(skb); 1624 } 1625 1626 static void __mld_report_work(struct sk_buff *skb) 1627 { 1628 struct inet6_dev *idev; 1629 struct ifmcaddr6 *ma; 1630 struct mld_msg *mld; 1631 int addr_type; 1632 1633 /* Our own report looped back. Ignore it. */ 1634 if (skb->pkt_type == PACKET_LOOPBACK) 1635 goto kfree_skb; 1636 1637 /* send our report if the MC router may not have heard this report */ 1638 if (skb->pkt_type != PACKET_MULTICAST && 1639 skb->pkt_type != PACKET_BROADCAST) 1640 goto kfree_skb; 1641 1642 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1643 goto kfree_skb; 1644 1645 mld = (struct mld_msg *)icmp6_hdr(skb); 1646 1647 /* Drop reports with not link local source */ 1648 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1649 if (addr_type != IPV6_ADDR_ANY && 1650 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1651 goto kfree_skb; 1652 1653 idev = in6_dev_get(skb->dev); 1654 if (!idev) 1655 goto kfree_skb; 1656 1657 /* 1658 * Cancel the work for this group 1659 */ 1660 1661 for_each_mc_mclock(idev, ma) { 1662 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1663 if (cancel_delayed_work(&ma->mca_work)) 1664 refcount_dec(&ma->mca_refcnt); 1665 WRITE_ONCE(ma->mca_flags, 1666 ma->mca_flags & ~(MAF_LAST_REPORTER | 1667 MAF_TIMER_RUNNING)); 1668 break; 1669 } 1670 } 1671 1672 in6_dev_put(idev); 1673 kfree_skb: 1674 consume_skb(skb); 1675 } 1676 1677 static void mld_report_work(struct work_struct *work) 1678 { 1679 struct inet6_dev *idev = container_of(to_delayed_work(work), 1680 struct inet6_dev, 1681 mc_report_work); 1682 struct sk_buff_head q; 1683 struct sk_buff *skb; 1684 bool rework = false; 1685 int cnt = 0; 1686 1687 skb_queue_head_init(&q); 1688 spin_lock_bh(&idev->mc_report_lock); 1689 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1690 __skb_queue_tail(&q, skb); 1691 1692 if (++cnt >= MLD_MAX_QUEUE) { 1693 rework = true; 1694 break; 1695 } 1696 } 1697 spin_unlock_bh(&idev->mc_report_lock); 1698 1699 mutex_lock(&idev->mc_lock); 1700 while ((skb = __skb_dequeue(&q))) 1701 __mld_report_work(skb); 1702 mutex_unlock(&idev->mc_lock); 1703 1704 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1705 return; 1706 1707 in6_dev_put(idev); 1708 } 1709 1710 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1711 int gdeleted, int sdeleted) 1712 { 1713 switch (type) { 1714 case MLD2_MODE_IS_INCLUDE: 1715 case MLD2_MODE_IS_EXCLUDE: 1716 if (gdeleted || sdeleted) 1717 return false; 1718 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1719 if (pmc->mca_sfmode == MCAST_INCLUDE) 1720 return true; 1721 /* don't include if this source is excluded 1722 * in all filters 1723 */ 1724 if (psf->sf_count[MCAST_INCLUDE]) 1725 return type == MLD2_MODE_IS_INCLUDE; 1726 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1727 psf->sf_count[MCAST_EXCLUDE]; 1728 } 1729 return false; 1730 case MLD2_CHANGE_TO_INCLUDE: 1731 if (gdeleted || sdeleted) 1732 return false; 1733 return psf->sf_count[MCAST_INCLUDE] != 0; 1734 case MLD2_CHANGE_TO_EXCLUDE: 1735 if (gdeleted || sdeleted) 1736 return false; 1737 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1738 psf->sf_count[MCAST_INCLUDE]) 1739 return false; 1740 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1741 psf->sf_count[MCAST_EXCLUDE]; 1742 case MLD2_ALLOW_NEW_SOURCES: 1743 if (gdeleted || !psf->sf_crcount) 1744 return false; 1745 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1746 case MLD2_BLOCK_OLD_SOURCES: 1747 if (pmc->mca_sfmode == MCAST_INCLUDE) 1748 return gdeleted || (psf->sf_crcount && sdeleted); 1749 return psf->sf_crcount && !gdeleted && !sdeleted; 1750 } 1751 return false; 1752 } 1753 1754 static int 1755 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1756 { 1757 struct ip6_sf_list *psf; 1758 int scount = 0; 1759 1760 for_each_psf_mclock(pmc, psf) { 1761 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1762 continue; 1763 scount++; 1764 } 1765 return scount; 1766 } 1767 1768 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1769 struct net_device *dev, const struct in6_addr *saddr, 1770 const struct in6_addr *daddr, int proto, int len) 1771 { 1772 struct ipv6hdr *hdr; 1773 1774 skb->protocol = htons(ETH_P_IPV6); 1775 skb->dev = dev; 1776 1777 skb_reset_network_header(skb); 1778 skb_put(skb, sizeof(struct ipv6hdr)); 1779 hdr = ipv6_hdr(skb); 1780 1781 ip6_flow_hdr(hdr, 0, 0); 1782 1783 hdr->payload_len = htons(len); 1784 hdr->nexthdr = proto; 1785 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1786 1787 hdr->saddr = *saddr; 1788 hdr->daddr = *daddr; 1789 } 1790 1791 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1792 { 1793 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1794 2, 0, 0, IPV6_TLV_PADN, 0 }; 1795 struct net_device *dev = idev->dev; 1796 int hlen = LL_RESERVED_SPACE(dev); 1797 int tlen = dev->needed_tailroom; 1798 const struct in6_addr *saddr; 1799 struct in6_addr addr_buf; 1800 struct mld2_report *pmr; 1801 struct sk_buff *skb; 1802 unsigned int size; 1803 struct sock *sk; 1804 struct net *net; 1805 1806 /* we assume size > sizeof(ra) here 1807 * Also try to not allocate high-order pages for big MTU 1808 */ 1809 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1810 skb = alloc_skb(size, GFP_KERNEL); 1811 if (!skb) 1812 return NULL; 1813 1814 skb->priority = TC_PRIO_CONTROL; 1815 skb_reserve(skb, hlen); 1816 skb_tailroom_reserve(skb, mtu, tlen); 1817 1818 rcu_read_lock(); 1819 1820 net = dev_net_rcu(dev); 1821 sk = net->ipv6.igmp_sk; 1822 skb_set_owner_w(skb, sk); 1823 1824 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1825 /* <draft-ietf-magma-mld-source-05.txt>: 1826 * use unspecified address as the source address 1827 * when a valid link-local address is not available. 1828 */ 1829 saddr = &in6addr_any; 1830 } else 1831 saddr = &addr_buf; 1832 1833 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1834 1835 rcu_read_unlock(); 1836 1837 skb_put_data(skb, ra, sizeof(ra)); 1838 1839 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1840 skb_put(skb, sizeof(*pmr)); 1841 pmr = (struct mld2_report *)skb_transport_header(skb); 1842 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1843 pmr->mld2r_resv1 = 0; 1844 pmr->mld2r_cksum = 0; 1845 pmr->mld2r_resv2 = 0; 1846 pmr->mld2r_ngrec = 0; 1847 return skb; 1848 } 1849 1850 static void mld_sendpack(struct sk_buff *skb) 1851 { 1852 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1853 struct mld2_report *pmr = 1854 (struct mld2_report *)skb_transport_header(skb); 1855 int payload_len, mldlen; 1856 struct inet6_dev *idev; 1857 struct net *net = dev_net(skb->dev); 1858 int err; 1859 struct flowi6 fl6; 1860 struct dst_entry *dst; 1861 1862 rcu_read_lock(); 1863 idev = __in6_dev_get(skb->dev); 1864 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1865 1866 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1867 sizeof(*pip6); 1868 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1869 pip6->payload_len = htons(payload_len); 1870 1871 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1872 IPPROTO_ICMPV6, 1873 csum_partial(skb_transport_header(skb), 1874 mldlen, 0)); 1875 1876 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1877 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1878 skb->dev->ifindex); 1879 dst = icmp6_dst_alloc(skb->dev, &fl6); 1880 1881 err = 0; 1882 if (IS_ERR(dst)) { 1883 err = PTR_ERR(dst); 1884 dst = NULL; 1885 } 1886 skb_dst_set(skb, dst); 1887 if (err) 1888 goto err_out; 1889 1890 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1891 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1892 dst_output); 1893 out: 1894 if (!err) { 1895 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1896 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1897 } else { 1898 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1899 } 1900 1901 rcu_read_unlock(); 1902 return; 1903 1904 err_out: 1905 kfree_skb(skb); 1906 goto out; 1907 } 1908 1909 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1910 { 1911 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1912 } 1913 1914 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1915 int type, struct mld2_grec **ppgr, unsigned int mtu) 1916 { 1917 struct mld2_report *pmr; 1918 struct mld2_grec *pgr; 1919 1920 if (!skb) { 1921 skb = mld_newpack(pmc->idev, mtu); 1922 if (!skb) 1923 return NULL; 1924 } 1925 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1926 pgr->grec_type = type; 1927 pgr->grec_auxwords = 0; 1928 pgr->grec_nsrcs = 0; 1929 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1930 pmr = (struct mld2_report *)skb_transport_header(skb); 1931 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1932 *ppgr = pgr; 1933 return skb; 1934 } 1935 1936 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1937 1938 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1939 int type, int gdeleted, int sdeleted, 1940 int crsend) 1941 { 1942 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1943 int scount, stotal, first, isquery, truncate; 1944 struct ip6_sf_list __rcu **psf_list; 1945 struct inet6_dev *idev = pmc->idev; 1946 struct net_device *dev = idev->dev; 1947 struct mld2_grec *pgr = NULL; 1948 struct mld2_report *pmr; 1949 unsigned int mtu; 1950 1951 mc_assert_locked(idev); 1952 1953 if (pmc->mca_flags & MAF_NOREPORT) 1954 return skb; 1955 1956 mtu = READ_ONCE(dev->mtu); 1957 if (mtu < IPV6_MIN_MTU) 1958 return skb; 1959 1960 isquery = type == MLD2_MODE_IS_INCLUDE || 1961 type == MLD2_MODE_IS_EXCLUDE; 1962 truncate = type == MLD2_MODE_IS_EXCLUDE || 1963 type == MLD2_CHANGE_TO_EXCLUDE; 1964 1965 stotal = scount = 0; 1966 1967 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1968 1969 if (!rcu_access_pointer(*psf_list)) 1970 goto empty_source; 1971 1972 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1973 1974 /* EX and TO_EX get a fresh packet, if needed */ 1975 if (truncate) { 1976 if (pmr && pmr->mld2r_ngrec && 1977 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1978 if (skb) 1979 mld_sendpack(skb); 1980 skb = mld_newpack(idev, mtu); 1981 } 1982 } 1983 first = 1; 1984 psf_prev = NULL; 1985 for (psf = mc_dereference(*psf_list, idev); 1986 psf; 1987 psf = psf_next) { 1988 struct in6_addr *psrc; 1989 1990 psf_next = mc_dereference(psf->sf_next, idev); 1991 1992 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1993 psf_prev = psf; 1994 continue; 1995 } 1996 1997 /* Based on RFC3810 6.1. Should not send source-list change 1998 * records when there is a filter mode change. 1999 */ 2000 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 2001 (!gdeleted && pmc->mca_crcount)) && 2002 (type == MLD2_ALLOW_NEW_SOURCES || 2003 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 2004 goto decrease_sf_crcount; 2005 2006 /* clear marks on query responses */ 2007 if (isquery) 2008 psf->sf_gsresp = 0; 2009 2010 if (AVAILABLE(skb) < sizeof(*psrc) + 2011 first*sizeof(struct mld2_grec)) { 2012 if (truncate && !first) 2013 break; /* truncate these */ 2014 if (pgr) 2015 pgr->grec_nsrcs = htons(scount); 2016 if (skb) 2017 mld_sendpack(skb); 2018 skb = mld_newpack(idev, mtu); 2019 first = 1; 2020 scount = 0; 2021 } 2022 if (first) { 2023 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2024 first = 0; 2025 } 2026 if (!skb) 2027 return NULL; 2028 psrc = skb_put(skb, sizeof(*psrc)); 2029 *psrc = psf->sf_addr; 2030 scount++; stotal++; 2031 if ((type == MLD2_ALLOW_NEW_SOURCES || 2032 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 2033 decrease_sf_crcount: 2034 psf->sf_crcount--; 2035 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 2036 if (psf_prev) 2037 rcu_assign_pointer(psf_prev->sf_next, 2038 mc_dereference(psf->sf_next, idev)); 2039 else 2040 rcu_assign_pointer(*psf_list, 2041 mc_dereference(psf->sf_next, idev)); 2042 kfree_rcu(psf, rcu); 2043 continue; 2044 } 2045 } 2046 psf_prev = psf; 2047 } 2048 2049 empty_source: 2050 if (!stotal) { 2051 if (type == MLD2_ALLOW_NEW_SOURCES || 2052 type == MLD2_BLOCK_OLD_SOURCES) 2053 return skb; 2054 if (pmc->mca_crcount || isquery || crsend) { 2055 /* make sure we have room for group header */ 2056 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 2057 mld_sendpack(skb); 2058 skb = NULL; /* add_grhead will get a new one */ 2059 } 2060 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2061 } 2062 } 2063 if (pgr) 2064 pgr->grec_nsrcs = htons(scount); 2065 2066 if (isquery) { 2067 /* clear query state */ 2068 WRITE_ONCE(pmc->mca_flags, pmc->mca_flags & ~MAF_GSQUERY); 2069 } 2070 return skb; 2071 } 2072 2073 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2074 { 2075 struct sk_buff *skb = NULL; 2076 int type; 2077 2078 mc_assert_locked(idev); 2079 2080 if (!pmc) { 2081 for_each_mc_mclock(idev, pmc) { 2082 if (pmc->mca_flags & MAF_NOREPORT) 2083 continue; 2084 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2085 type = MLD2_MODE_IS_EXCLUDE; 2086 else 2087 type = MLD2_MODE_IS_INCLUDE; 2088 skb = add_grec(skb, pmc, type, 0, 0, 0); 2089 } 2090 } else { 2091 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2092 type = MLD2_MODE_IS_EXCLUDE; 2093 else 2094 type = MLD2_MODE_IS_INCLUDE; 2095 skb = add_grec(skb, pmc, type, 0, 0, 0); 2096 } 2097 if (skb) 2098 mld_sendpack(skb); 2099 } 2100 2101 /* remove zero-count source records from a source filter list */ 2102 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2103 { 2104 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2105 2106 psf_prev = NULL; 2107 for (psf = mc_dereference(*ppsf, idev); 2108 psf; 2109 psf = psf_next) { 2110 psf_next = mc_dereference(psf->sf_next, idev); 2111 if (psf->sf_crcount == 0) { 2112 if (psf_prev) 2113 rcu_assign_pointer(psf_prev->sf_next, 2114 mc_dereference(psf->sf_next, idev)); 2115 else 2116 rcu_assign_pointer(*ppsf, 2117 mc_dereference(psf->sf_next, idev)); 2118 kfree_rcu(psf, rcu); 2119 } else { 2120 psf_prev = psf; 2121 } 2122 } 2123 } 2124 2125 static void mld_send_cr(struct inet6_dev *idev) 2126 { 2127 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2128 struct sk_buff *skb = NULL; 2129 int type, dtype; 2130 2131 /* deleted MCA's */ 2132 pmc_prev = NULL; 2133 for (pmc = mc_dereference(idev->mc_tomb, idev); 2134 pmc; 2135 pmc = pmc_next) { 2136 pmc_next = mc_dereference(pmc->next, idev); 2137 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2138 type = MLD2_BLOCK_OLD_SOURCES; 2139 dtype = MLD2_BLOCK_OLD_SOURCES; 2140 skb = add_grec(skb, pmc, type, 1, 0, 0); 2141 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2142 } 2143 if (pmc->mca_crcount) { 2144 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2145 type = MLD2_CHANGE_TO_INCLUDE; 2146 skb = add_grec(skb, pmc, type, 1, 0, 0); 2147 } 2148 pmc->mca_crcount--; 2149 if (pmc->mca_crcount == 0) { 2150 mld_clear_zeros(&pmc->mca_tomb, idev); 2151 mld_clear_zeros(&pmc->mca_sources, idev); 2152 } 2153 } 2154 if (pmc->mca_crcount == 0 && 2155 !rcu_access_pointer(pmc->mca_tomb) && 2156 !rcu_access_pointer(pmc->mca_sources)) { 2157 if (pmc_prev) 2158 rcu_assign_pointer(pmc_prev->next, pmc_next); 2159 else 2160 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2161 in6_dev_put(pmc->idev); 2162 kfree_rcu(pmc, rcu); 2163 } else 2164 pmc_prev = pmc; 2165 } 2166 2167 /* change recs */ 2168 for_each_mc_mclock(idev, pmc) { 2169 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2170 type = MLD2_BLOCK_OLD_SOURCES; 2171 dtype = MLD2_ALLOW_NEW_SOURCES; 2172 } else { 2173 type = MLD2_ALLOW_NEW_SOURCES; 2174 dtype = MLD2_BLOCK_OLD_SOURCES; 2175 } 2176 skb = add_grec(skb, pmc, type, 0, 0, 0); 2177 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2178 2179 /* filter mode changes */ 2180 if (pmc->mca_crcount) { 2181 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2182 type = MLD2_CHANGE_TO_EXCLUDE; 2183 else 2184 type = MLD2_CHANGE_TO_INCLUDE; 2185 skb = add_grec(skb, pmc, type, 0, 0, 0); 2186 pmc->mca_crcount--; 2187 } 2188 } 2189 if (!skb) 2190 return; 2191 (void) mld_sendpack(skb); 2192 } 2193 2194 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2195 { 2196 const struct in6_addr *snd_addr, *saddr; 2197 int err, len, payload_len, full_len; 2198 struct in6_addr addr_buf; 2199 struct inet6_dev *idev; 2200 struct sk_buff *skb; 2201 struct mld_msg *hdr; 2202 int hlen = LL_RESERVED_SPACE(dev); 2203 int tlen = dev->needed_tailroom; 2204 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2205 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2206 IPV6_TLV_PADN, 0 }; 2207 struct dst_entry *dst; 2208 struct flowi6 fl6; 2209 struct net *net; 2210 struct sock *sk; 2211 2212 if (type == ICMPV6_MGM_REDUCTION) 2213 snd_addr = &in6addr_linklocal_allrouters; 2214 else 2215 snd_addr = addr; 2216 2217 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2218 payload_len = len + sizeof(ra); 2219 full_len = sizeof(struct ipv6hdr) + payload_len; 2220 2221 skb = alloc_skb(hlen + tlen + full_len, GFP_KERNEL); 2222 2223 rcu_read_lock(); 2224 2225 net = dev_net_rcu(dev); 2226 idev = __in6_dev_get(dev); 2227 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 2228 if (!skb) { 2229 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2230 rcu_read_unlock(); 2231 return; 2232 } 2233 sk = net->ipv6.igmp_sk; 2234 skb_set_owner_w(skb, sk); 2235 2236 skb->priority = TC_PRIO_CONTROL; 2237 skb_reserve(skb, hlen); 2238 2239 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2240 /* <draft-ietf-magma-mld-source-05.txt>: 2241 * use unspecified address as the source address 2242 * when a valid link-local address is not available. 2243 */ 2244 saddr = &in6addr_any; 2245 } else 2246 saddr = &addr_buf; 2247 2248 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2249 2250 skb_put_data(skb, ra, sizeof(ra)); 2251 2252 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2253 hdr->mld_type = type; 2254 hdr->mld_mca = *addr; 2255 2256 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2257 IPPROTO_ICMPV6, 2258 csum_partial(hdr, len, 0)); 2259 2260 icmpv6_flow_init(sk, &fl6, type, 2261 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2262 skb->dev->ifindex); 2263 dst = icmp6_dst_alloc(skb->dev, &fl6); 2264 if (IS_ERR(dst)) { 2265 err = PTR_ERR(dst); 2266 goto err_out; 2267 } 2268 2269 skb_dst_set(skb, dst); 2270 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2271 net, sk, skb, NULL, skb->dev, 2272 dst_output); 2273 out: 2274 if (!err) { 2275 ICMP6MSGOUT_INC_STATS(net, idev, type); 2276 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2277 } else 2278 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2279 2280 rcu_read_unlock(); 2281 return; 2282 2283 err_out: 2284 kfree_skb(skb); 2285 goto out; 2286 } 2287 2288 static void mld_send_initial_cr(struct inet6_dev *idev) 2289 { 2290 struct ifmcaddr6 *pmc; 2291 struct sk_buff *skb; 2292 int type; 2293 2294 mc_assert_locked(idev); 2295 2296 if (mld_in_v1_mode(idev)) 2297 return; 2298 2299 skb = NULL; 2300 for_each_mc_mclock(idev, pmc) { 2301 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2302 type = MLD2_CHANGE_TO_EXCLUDE; 2303 else 2304 type = MLD2_ALLOW_NEW_SOURCES; 2305 skb = add_grec(skb, pmc, type, 0, 0, 1); 2306 } 2307 if (skb) 2308 mld_sendpack(skb); 2309 } 2310 2311 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2312 { 2313 mutex_lock(&idev->mc_lock); 2314 idev->mc_dad_count = idev->mc_qrv; 2315 if (idev->mc_dad_count) { 2316 mld_send_initial_cr(idev); 2317 idev->mc_dad_count--; 2318 if (idev->mc_dad_count) 2319 mld_dad_start_work(idev, 2320 unsolicited_report_interval(idev)); 2321 } 2322 mutex_unlock(&idev->mc_lock); 2323 } 2324 2325 static void mld_dad_work(struct work_struct *work) 2326 { 2327 struct inet6_dev *idev = container_of(to_delayed_work(work), 2328 struct inet6_dev, 2329 mc_dad_work); 2330 mutex_lock(&idev->mc_lock); 2331 mld_send_initial_cr(idev); 2332 if (idev->mc_dad_count) { 2333 idev->mc_dad_count--; 2334 if (idev->mc_dad_count) 2335 mld_dad_start_work(idev, 2336 unsolicited_report_interval(idev)); 2337 } 2338 mutex_unlock(&idev->mc_lock); 2339 in6_dev_put(idev); 2340 } 2341 2342 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2343 const struct in6_addr *psfsrc) 2344 { 2345 struct ip6_sf_list *psf, *psf_prev; 2346 int rv = 0; 2347 2348 mc_assert_locked(pmc->idev); 2349 2350 psf_prev = NULL; 2351 for_each_psf_mclock(pmc, psf) { 2352 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2353 break; 2354 psf_prev = psf; 2355 } 2356 if (!psf || psf->sf_count[sfmode] == 0) { 2357 /* source filter not found, or count wrong => bug */ 2358 return -ESRCH; 2359 } 2360 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1); 2361 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2362 struct inet6_dev *idev = pmc->idev; 2363 2364 /* no more filters for this source */ 2365 if (psf_prev) 2366 rcu_assign_pointer(psf_prev->sf_next, 2367 mc_dereference(psf->sf_next, idev)); 2368 else 2369 rcu_assign_pointer(pmc->mca_sources, 2370 mc_dereference(psf->sf_next, idev)); 2371 2372 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2373 !mld_in_v1_mode(idev)) { 2374 struct ip6_sf_list *dpsf = kmalloc_obj(*dpsf); 2375 2376 if (dpsf) { 2377 *dpsf = *psf; 2378 dpsf->sf_crcount = idev->mc_qrv; 2379 rcu_assign_pointer(dpsf->sf_next, 2380 mc_dereference(pmc->mca_tomb, idev)); 2381 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2382 rv = 1; 2383 } 2384 } 2385 kfree_rcu(psf, rcu); 2386 } 2387 return rv; 2388 } 2389 2390 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2391 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2392 int delta) 2393 { 2394 struct ifmcaddr6 *pmc; 2395 int changerec = 0; 2396 int i, err; 2397 2398 if (!idev) 2399 return -ENODEV; 2400 2401 mc_assert_locked(idev); 2402 2403 for_each_mc_mclock(idev, pmc) { 2404 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2405 break; 2406 } 2407 if (!pmc) 2408 return -ESRCH; 2409 2410 sf_markstate(pmc); 2411 if (!delta) { 2412 if (!pmc->mca_sfcount[sfmode]) 2413 return -EINVAL; 2414 2415 pmc->mca_sfcount[sfmode]--; 2416 } 2417 err = 0; 2418 for (i = 0; i < sfcount; i++) { 2419 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2420 2421 changerec |= rv > 0; 2422 if (!err && rv < 0) 2423 err = rv; 2424 } 2425 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2426 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2427 pmc->mca_sfcount[MCAST_INCLUDE]) { 2428 struct ip6_sf_list *psf; 2429 2430 /* filter mode change */ 2431 pmc->mca_sfmode = MCAST_INCLUDE; 2432 pmc->mca_crcount = idev->mc_qrv; 2433 idev->mc_ifc_count = pmc->mca_crcount; 2434 for_each_psf_mclock(pmc, psf) 2435 psf->sf_crcount = 0; 2436 mld_ifc_event(pmc->idev); 2437 } else if (sf_setstate(pmc) || changerec) { 2438 mld_ifc_event(pmc->idev); 2439 } 2440 2441 return err; 2442 } 2443 2444 /* Add multicast single-source filter to the interface list */ 2445 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2446 const struct in6_addr *psfsrc) 2447 { 2448 struct ip6_sf_list *psf, *psf_prev; 2449 2450 mc_assert_locked(pmc->idev); 2451 2452 psf_prev = NULL; 2453 for_each_psf_mclock(pmc, psf) { 2454 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2455 break; 2456 psf_prev = psf; 2457 } 2458 if (!psf) { 2459 psf = kzalloc_obj(*psf); 2460 if (!psf) 2461 return -ENOBUFS; 2462 2463 psf->sf_addr = *psfsrc; 2464 if (psf_prev) { 2465 rcu_assign_pointer(psf_prev->sf_next, psf); 2466 } else { 2467 rcu_assign_pointer(pmc->mca_sources, psf); 2468 } 2469 } 2470 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1); 2471 return 0; 2472 } 2473 2474 static void sf_markstate(struct ifmcaddr6 *pmc) 2475 { 2476 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2477 struct ip6_sf_list *psf; 2478 2479 mc_assert_locked(pmc->idev); 2480 2481 for_each_psf_mclock(pmc, psf) { 2482 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2483 psf->sf_oldin = mca_xcount == 2484 psf->sf_count[MCAST_EXCLUDE] && 2485 !psf->sf_count[MCAST_INCLUDE]; 2486 } else { 2487 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2488 } 2489 } 2490 } 2491 2492 static int sf_setstate(struct ifmcaddr6 *pmc) 2493 { 2494 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2495 struct ip6_sf_list *psf, *dpsf; 2496 int qrv = pmc->idev->mc_qrv; 2497 int new_in, rv; 2498 2499 mc_assert_locked(pmc->idev); 2500 2501 rv = 0; 2502 for_each_psf_mclock(pmc, psf) { 2503 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2504 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2505 !psf->sf_count[MCAST_INCLUDE]; 2506 } else 2507 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2508 if (new_in) { 2509 if (!psf->sf_oldin) { 2510 struct ip6_sf_list *prev = NULL; 2511 2512 for_each_psf_tomb(pmc, dpsf) { 2513 if (ipv6_addr_equal(&dpsf->sf_addr, 2514 &psf->sf_addr)) 2515 break; 2516 prev = dpsf; 2517 } 2518 if (dpsf) { 2519 if (prev) 2520 rcu_assign_pointer(prev->sf_next, 2521 mc_dereference(dpsf->sf_next, 2522 pmc->idev)); 2523 else 2524 rcu_assign_pointer(pmc->mca_tomb, 2525 mc_dereference(dpsf->sf_next, 2526 pmc->idev)); 2527 kfree_rcu(dpsf, rcu); 2528 } 2529 psf->sf_crcount = qrv; 2530 rv++; 2531 } 2532 } else if (psf->sf_oldin) { 2533 psf->sf_crcount = 0; 2534 /* 2535 * add or update "delete" records if an active filter 2536 * is now inactive 2537 */ 2538 2539 for_each_psf_tomb(pmc, dpsf) 2540 if (ipv6_addr_equal(&dpsf->sf_addr, 2541 &psf->sf_addr)) 2542 break; 2543 if (!dpsf) { 2544 dpsf = kmalloc_obj(*dpsf); 2545 if (!dpsf) 2546 continue; 2547 *dpsf = *psf; 2548 rcu_assign_pointer(dpsf->sf_next, 2549 mc_dereference(pmc->mca_tomb, pmc->idev)); 2550 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2551 } 2552 dpsf->sf_crcount = qrv; 2553 rv++; 2554 } 2555 } 2556 return rv; 2557 } 2558 2559 /* Add multicast source filter list to the interface list */ 2560 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2561 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2562 int delta) 2563 { 2564 struct ifmcaddr6 *pmc; 2565 int isexclude; 2566 int i, err; 2567 2568 if (!idev) 2569 return -ENODEV; 2570 2571 mc_assert_locked(idev); 2572 2573 for_each_mc_mclock(idev, pmc) { 2574 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2575 break; 2576 } 2577 if (!pmc) 2578 return -ESRCH; 2579 2580 sf_markstate(pmc); 2581 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2582 if (!delta) 2583 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2584 pmc->mca_sfcount[sfmode] + 1); 2585 err = 0; 2586 for (i = 0; i < sfcount; i++) { 2587 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2588 if (err) 2589 break; 2590 } 2591 if (err) { 2592 int j; 2593 2594 if (!delta) 2595 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2596 pmc->mca_sfcount[sfmode] - 1); 2597 for (j = 0; j < i; j++) 2598 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2599 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2600 struct ip6_sf_list *psf; 2601 2602 /* filter mode change */ 2603 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2604 pmc->mca_sfmode = MCAST_EXCLUDE; 2605 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2606 pmc->mca_sfmode = MCAST_INCLUDE; 2607 /* else no filters; keep old mode for reports */ 2608 2609 pmc->mca_crcount = idev->mc_qrv; 2610 idev->mc_ifc_count = pmc->mca_crcount; 2611 for_each_psf_mclock(pmc, psf) 2612 psf->sf_crcount = 0; 2613 mld_ifc_event(idev); 2614 } else if (sf_setstate(pmc)) { 2615 mld_ifc_event(idev); 2616 } 2617 return err; 2618 } 2619 2620 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2621 { 2622 struct ip6_sf_list *psf, *nextpsf; 2623 2624 mc_assert_locked(pmc->idev); 2625 2626 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2627 psf; 2628 psf = nextpsf) { 2629 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2630 kfree_rcu(psf, rcu); 2631 } 2632 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2633 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2634 psf; 2635 psf = nextpsf) { 2636 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2637 kfree_rcu(psf, rcu); 2638 } 2639 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2640 pmc->mca_sfmode = MCAST_EXCLUDE; 2641 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2642 /* Paired with the READ_ONCE() from ipv6_chk_mcast_addr() */ 2643 WRITE_ONCE(pmc->mca_sfcount[MCAST_EXCLUDE], 1); 2644 } 2645 2646 static void igmp6_join_group(struct ifmcaddr6 *ma) 2647 { 2648 unsigned long delay, interval; 2649 2650 mc_assert_locked(ma->idev); 2651 2652 if (ma->mca_flags & MAF_NOREPORT) 2653 return; 2654 2655 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2656 2657 interval = unsolicited_report_interval(ma->idev); 2658 delay = interval; 2659 2660 if (cancel_delayed_work(&ma->mca_work)) { 2661 refcount_dec(&ma->mca_refcnt); 2662 delay = ma->mca_work.timer.expires - jiffies; 2663 } 2664 2665 if (delay >= interval) 2666 delay = get_random_u32_below(interval); 2667 2668 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2669 refcount_inc(&ma->mca_refcnt); 2670 WRITE_ONCE(ma->mca_flags, ma->mca_flags | 2671 MAF_TIMER_RUNNING | MAF_LAST_REPORTER); 2672 } 2673 2674 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2675 struct inet6_dev *idev) 2676 { 2677 struct ip6_sf_socklist *psl; 2678 int err; 2679 2680 psl = sock_dereference(iml->sflist, sk); 2681 2682 if (idev) 2683 mutex_lock(&idev->mc_lock); 2684 2685 if (!psl) { 2686 /* any-source empty exclude case */ 2687 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2688 } else { 2689 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2690 psl->sl_count, psl->sl_addr, 0); 2691 RCU_INIT_POINTER(iml->sflist, NULL); 2692 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2693 &sk->sk_omem_alloc); 2694 kfree_rcu(psl, rcu); 2695 } 2696 2697 if (idev) 2698 mutex_unlock(&idev->mc_lock); 2699 2700 return err; 2701 } 2702 2703 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2704 { 2705 mc_assert_locked(ma->idev); 2706 2707 if (mld_in_v1_mode(ma->idev)) { 2708 if (ma->mca_flags & MAF_LAST_REPORTER) { 2709 igmp6_send(&ma->mca_addr, ma->idev->dev, 2710 ICMPV6_MGM_REDUCTION); 2711 } 2712 } else { 2713 mld_add_delrec(ma->idev, ma); 2714 mld_ifc_event(ma->idev); 2715 } 2716 } 2717 2718 static void mld_gq_work(struct work_struct *work) 2719 { 2720 struct inet6_dev *idev = container_of(to_delayed_work(work), 2721 struct inet6_dev, 2722 mc_gq_work); 2723 2724 mutex_lock(&idev->mc_lock); 2725 mld_send_report(idev, NULL); 2726 idev->mc_gq_running = 0; 2727 mutex_unlock(&idev->mc_lock); 2728 2729 in6_dev_put(idev); 2730 } 2731 2732 static void mld_ifc_work(struct work_struct *work) 2733 { 2734 struct inet6_dev *idev = container_of(to_delayed_work(work), 2735 struct inet6_dev, 2736 mc_ifc_work); 2737 2738 mutex_lock(&idev->mc_lock); 2739 mld_send_cr(idev); 2740 2741 if (idev->mc_ifc_count) { 2742 idev->mc_ifc_count--; 2743 if (idev->mc_ifc_count) 2744 mld_ifc_start_work(idev, 2745 unsolicited_report_interval(idev)); 2746 } 2747 mutex_unlock(&idev->mc_lock); 2748 in6_dev_put(idev); 2749 } 2750 2751 static void mld_ifc_event(struct inet6_dev *idev) 2752 { 2753 mc_assert_locked(idev); 2754 2755 if (mld_in_v1_mode(idev)) 2756 return; 2757 2758 idev->mc_ifc_count = idev->mc_qrv; 2759 mld_ifc_start_work(idev, 1); 2760 } 2761 2762 static void mld_mca_work(struct work_struct *work) 2763 { 2764 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2765 struct ifmcaddr6, mca_work); 2766 2767 mutex_lock(&ma->idev->mc_lock); 2768 if (mld_in_v1_mode(ma->idev)) 2769 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2770 else 2771 mld_send_report(ma->idev, ma); 2772 WRITE_ONCE(ma->mca_flags, (ma->mca_flags | MAF_LAST_REPORTER) & 2773 ~MAF_TIMER_RUNNING); 2774 mutex_unlock(&ma->idev->mc_lock); 2775 2776 ma_put(ma); 2777 } 2778 2779 /* Device changing type */ 2780 2781 void ipv6_mc_unmap(struct inet6_dev *idev) 2782 { 2783 struct ifmcaddr6 *i; 2784 2785 /* Install multicast list, except for all-nodes (already installed) */ 2786 2787 mutex_lock(&idev->mc_lock); 2788 for_each_mc_mclock(idev, i) 2789 igmp6_group_dropped(i); 2790 mutex_unlock(&idev->mc_lock); 2791 } 2792 2793 void ipv6_mc_remap(struct inet6_dev *idev) 2794 { 2795 ipv6_mc_up(idev); 2796 } 2797 2798 /* Device going down */ 2799 void ipv6_mc_down(struct inet6_dev *idev) 2800 { 2801 struct ifmcaddr6 *i; 2802 2803 mutex_lock(&idev->mc_lock); 2804 /* Withdraw multicast list */ 2805 for_each_mc_mclock(idev, i) 2806 igmp6_group_dropped(i); 2807 mutex_unlock(&idev->mc_lock); 2808 2809 /* Should stop work after group drop. or we will 2810 * start work again in mld_ifc_event() 2811 */ 2812 mld_query_stop_work(idev); 2813 mld_report_stop_work(idev); 2814 2815 mutex_lock(&idev->mc_lock); 2816 mld_ifc_stop_work(idev); 2817 mld_gq_stop_work(idev); 2818 mutex_unlock(&idev->mc_lock); 2819 2820 mld_dad_stop_work(idev); 2821 } 2822 2823 static void ipv6_mc_reset(struct inet6_dev *idev) 2824 { 2825 idev->mc_qrv = sysctl_mld_qrv; 2826 idev->mc_qi = MLD_QI_DEFAULT; 2827 idev->mc_qri = MLD_QRI_DEFAULT; 2828 idev->mc_v1_seen = 0; 2829 idev->mc_maxdelay = unsolicited_report_interval(idev); 2830 } 2831 2832 /* Device going up */ 2833 2834 void ipv6_mc_up(struct inet6_dev *idev) 2835 { 2836 struct ifmcaddr6 *i; 2837 2838 /* Install multicast list, except for all-nodes (already installed) */ 2839 2840 ipv6_mc_reset(idev); 2841 mutex_lock(&idev->mc_lock); 2842 for_each_mc_mclock(idev, i) { 2843 mld_del_delrec(idev, i); 2844 igmp6_group_added(i); 2845 } 2846 mutex_unlock(&idev->mc_lock); 2847 } 2848 2849 /* IPv6 device initialization. */ 2850 2851 void ipv6_mc_init_dev(struct inet6_dev *idev) 2852 { 2853 idev->mc_gq_running = 0; 2854 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2855 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2856 idev->mc_ifc_count = 0; 2857 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2858 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2859 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2860 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2861 skb_queue_head_init(&idev->mc_query_queue); 2862 skb_queue_head_init(&idev->mc_report_queue); 2863 spin_lock_init(&idev->mc_query_lock); 2864 spin_lock_init(&idev->mc_report_lock); 2865 mutex_init(&idev->mc_lock); 2866 ipv6_mc_reset(idev); 2867 } 2868 2869 /* 2870 * Device is about to be destroyed: clean up. 2871 */ 2872 2873 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2874 { 2875 struct ifmcaddr6 *i; 2876 2877 /* Deactivate works */ 2878 ipv6_mc_down(idev); 2879 mutex_lock(&idev->mc_lock); 2880 mld_clear_delrec(idev); 2881 mutex_unlock(&idev->mc_lock); 2882 mld_clear_query(idev); 2883 mld_clear_report(idev); 2884 2885 /* Delete all-nodes address. */ 2886 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2887 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2888 * fail. 2889 */ 2890 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2891 2892 if (idev->cnf.forwarding) 2893 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2894 2895 mutex_lock(&idev->mc_lock); 2896 while ((i = mc_dereference(idev->mc_list, idev))) { 2897 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2898 2899 ip6_mc_clear_src(i); 2900 ma_put(i); 2901 } 2902 mutex_unlock(&idev->mc_lock); 2903 } 2904 2905 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2906 { 2907 struct ifmcaddr6 *pmc; 2908 2909 mutex_lock(&idev->mc_lock); 2910 if (mld_in_v1_mode(idev)) { 2911 for_each_mc_mclock(idev, pmc) 2912 igmp6_join_group(pmc); 2913 } else { 2914 mld_send_report(idev, NULL); 2915 } 2916 mutex_unlock(&idev->mc_lock); 2917 } 2918 2919 static int ipv6_mc_netdev_event(struct notifier_block *this, 2920 unsigned long event, 2921 void *ptr) 2922 { 2923 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2924 struct inet6_dev *idev = __in6_dev_get(dev); 2925 2926 switch (event) { 2927 case NETDEV_RESEND_IGMP: 2928 if (idev) 2929 ipv6_mc_rejoin_groups(idev); 2930 break; 2931 default: 2932 break; 2933 } 2934 2935 return NOTIFY_DONE; 2936 } 2937 2938 static struct notifier_block igmp6_netdev_notifier = { 2939 .notifier_call = ipv6_mc_netdev_event, 2940 }; 2941 2942 #ifdef CONFIG_PROC_FS 2943 struct igmp6_mc_iter_state { 2944 struct seq_net_private p; 2945 struct net_device *dev; 2946 struct inet6_dev *idev; 2947 }; 2948 2949 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2950 2951 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2952 { 2953 struct ifmcaddr6 *im = NULL; 2954 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2955 struct net *net = seq_file_net(seq); 2956 2957 state->idev = NULL; 2958 for_each_netdev_rcu(net, state->dev) { 2959 struct inet6_dev *idev; 2960 idev = __in6_dev_get(state->dev); 2961 if (!idev) 2962 continue; 2963 2964 im = rcu_dereference(idev->mc_list); 2965 if (im) { 2966 state->idev = idev; 2967 break; 2968 } 2969 } 2970 return im; 2971 } 2972 2973 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2974 { 2975 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2976 2977 im = rcu_dereference(im->next); 2978 while (!im) { 2979 state->dev = next_net_device_rcu(state->dev); 2980 if (!state->dev) { 2981 state->idev = NULL; 2982 break; 2983 } 2984 state->idev = __in6_dev_get(state->dev); 2985 if (!state->idev) 2986 continue; 2987 im = rcu_dereference(state->idev->mc_list); 2988 } 2989 return im; 2990 } 2991 2992 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2993 { 2994 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2995 if (im) 2996 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2997 --pos; 2998 return pos ? NULL : im; 2999 } 3000 3001 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 3002 __acquires(RCU) 3003 { 3004 rcu_read_lock(); 3005 return igmp6_mc_get_idx(seq, *pos); 3006 } 3007 3008 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3009 { 3010 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 3011 3012 ++*pos; 3013 return im; 3014 } 3015 3016 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 3017 __releases(RCU) 3018 { 3019 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 3020 3021 if (likely(state->idev)) 3022 state->idev = NULL; 3023 state->dev = NULL; 3024 rcu_read_unlock(); 3025 } 3026 3027 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 3028 { 3029 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 3030 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 3031 unsigned int mca_flags = READ_ONCE(im->mca_flags); 3032 long delta = READ_ONCE(im->mca_work.timer.expires) - jiffies; 3033 3034 seq_printf(seq, 3035 "%-4d %-15s %pi6 %5d %08X %ld\n", 3036 state->dev->ifindex, state->dev->name, 3037 &im->mca_addr, 3038 READ_ONCE(im->mca_users), mca_flags, 3039 (mca_flags & MAF_TIMER_RUNNING) ? 3040 jiffies_delta_to_clock_t(delta) : 0); 3041 return 0; 3042 } 3043 3044 static const struct seq_operations igmp6_mc_seq_ops = { 3045 .start = igmp6_mc_seq_start, 3046 .next = igmp6_mc_seq_next, 3047 .stop = igmp6_mc_seq_stop, 3048 .show = igmp6_mc_seq_show, 3049 }; 3050 3051 struct igmp6_mcf_iter_state { 3052 struct seq_net_private p; 3053 struct net_device *dev; 3054 struct inet6_dev *idev; 3055 struct ifmcaddr6 *im; 3056 }; 3057 3058 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 3059 3060 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 3061 { 3062 struct ip6_sf_list *psf = NULL; 3063 struct ifmcaddr6 *im = NULL; 3064 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3065 struct net *net = seq_file_net(seq); 3066 3067 state->idev = NULL; 3068 state->im = NULL; 3069 for_each_netdev_rcu(net, state->dev) { 3070 struct inet6_dev *idev; 3071 idev = __in6_dev_get(state->dev); 3072 if (unlikely(idev == NULL)) 3073 continue; 3074 3075 im = rcu_dereference(idev->mc_list); 3076 if (likely(im)) { 3077 psf = rcu_dereference(im->mca_sources); 3078 if (likely(psf)) { 3079 state->im = im; 3080 state->idev = idev; 3081 break; 3082 } 3083 } 3084 } 3085 return psf; 3086 } 3087 3088 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3089 { 3090 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3091 3092 psf = rcu_dereference(psf->sf_next); 3093 while (!psf) { 3094 state->im = rcu_dereference(state->im->next); 3095 while (!state->im) { 3096 state->dev = next_net_device_rcu(state->dev); 3097 if (!state->dev) { 3098 state->idev = NULL; 3099 goto out; 3100 } 3101 state->idev = __in6_dev_get(state->dev); 3102 if (!state->idev) 3103 continue; 3104 state->im = rcu_dereference(state->idev->mc_list); 3105 } 3106 psf = rcu_dereference(state->im->mca_sources); 3107 } 3108 out: 3109 return psf; 3110 } 3111 3112 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3113 { 3114 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3115 if (psf) 3116 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3117 --pos; 3118 return pos ? NULL : psf; 3119 } 3120 3121 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3122 __acquires(RCU) 3123 { 3124 rcu_read_lock(); 3125 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3126 } 3127 3128 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3129 { 3130 struct ip6_sf_list *psf; 3131 if (v == SEQ_START_TOKEN) 3132 psf = igmp6_mcf_get_first(seq); 3133 else 3134 psf = igmp6_mcf_get_next(seq, v); 3135 ++*pos; 3136 return psf; 3137 } 3138 3139 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3140 __releases(RCU) 3141 { 3142 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3143 3144 if (likely(state->im)) 3145 state->im = NULL; 3146 if (likely(state->idev)) 3147 state->idev = NULL; 3148 3149 state->dev = NULL; 3150 rcu_read_unlock(); 3151 } 3152 3153 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3154 { 3155 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3156 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3157 3158 if (v == SEQ_START_TOKEN) { 3159 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3160 } else { 3161 seq_printf(seq, 3162 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3163 state->dev->ifindex, state->dev->name, 3164 &state->im->mca_addr, 3165 &psf->sf_addr, 3166 READ_ONCE(psf->sf_count[MCAST_INCLUDE]), 3167 READ_ONCE(psf->sf_count[MCAST_EXCLUDE])); 3168 } 3169 return 0; 3170 } 3171 3172 static const struct seq_operations igmp6_mcf_seq_ops = { 3173 .start = igmp6_mcf_seq_start, 3174 .next = igmp6_mcf_seq_next, 3175 .stop = igmp6_mcf_seq_stop, 3176 .show = igmp6_mcf_seq_show, 3177 }; 3178 3179 static int __net_init igmp6_proc_init(struct net *net) 3180 { 3181 int err; 3182 3183 err = -ENOMEM; 3184 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3185 sizeof(struct igmp6_mc_iter_state))) 3186 goto out; 3187 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3188 &igmp6_mcf_seq_ops, 3189 sizeof(struct igmp6_mcf_iter_state))) 3190 goto out_proc_net_igmp6; 3191 3192 err = 0; 3193 out: 3194 return err; 3195 3196 out_proc_net_igmp6: 3197 remove_proc_entry("igmp6", net->proc_net); 3198 goto out; 3199 } 3200 3201 static void __net_exit igmp6_proc_exit(struct net *net) 3202 { 3203 remove_proc_entry("mcfilter6", net->proc_net); 3204 remove_proc_entry("igmp6", net->proc_net); 3205 } 3206 #else 3207 static inline int igmp6_proc_init(struct net *net) 3208 { 3209 return 0; 3210 } 3211 static inline void igmp6_proc_exit(struct net *net) 3212 { 3213 } 3214 #endif 3215 3216 static int __net_init igmp6_net_init(struct net *net) 3217 { 3218 int err; 3219 3220 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3221 SOCK_RAW, IPPROTO_ICMPV6, net); 3222 if (err < 0) { 3223 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3224 err); 3225 goto out; 3226 } 3227 3228 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3229 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3230 3231 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3232 SOCK_RAW, IPPROTO_ICMPV6, net); 3233 if (err < 0) { 3234 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3235 err); 3236 goto out_sock_create; 3237 } 3238 3239 err = igmp6_proc_init(net); 3240 if (err) 3241 goto out_sock_create_autojoin; 3242 3243 return 0; 3244 3245 out_sock_create_autojoin: 3246 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3247 out_sock_create: 3248 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3249 out: 3250 return err; 3251 } 3252 3253 static void __net_exit igmp6_net_exit(struct net *net) 3254 { 3255 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3256 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3257 igmp6_proc_exit(net); 3258 } 3259 3260 static struct pernet_operations igmp6_net_ops = { 3261 .init = igmp6_net_init, 3262 .exit = igmp6_net_exit, 3263 }; 3264 3265 int __init igmp6_init(void) 3266 { 3267 int err; 3268 3269 err = register_pernet_subsys(&igmp6_net_ops); 3270 if (err) 3271 return err; 3272 3273 mld_wq = create_workqueue("mld"); 3274 if (!mld_wq) { 3275 unregister_pernet_subsys(&igmp6_net_ops); 3276 return -ENOMEM; 3277 } 3278 3279 return err; 3280 } 3281 3282 int __init igmp6_late_init(void) 3283 { 3284 return register_netdevice_notifier(&igmp6_netdev_notifier); 3285 } 3286 3287 void igmp6_cleanup(void) 3288 { 3289 unregister_pernet_subsys(&igmp6_net_ops); 3290 destroy_workqueue(mld_wq); 3291 } 3292 3293 void igmp6_late_cleanup(void) 3294 { 3295 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3296 } 3297