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 /* 112 * socket join on multicast group 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 int __ipv6_sock_mc_join(struct sock *sk, int ifindex, 173 const struct in6_addr *addr, unsigned int mode) 174 { 175 struct net_device *dev = NULL; 176 struct ipv6_mc_socklist *mc_lst; 177 struct ipv6_pinfo *np = inet6_sk(sk); 178 struct net *net = sock_net(sk); 179 int err; 180 181 ASSERT_RTNL(); 182 183 if (!ipv6_addr_is_multicast(addr)) 184 return -EINVAL; 185 186 for_each_pmc_socklock(np, sk, mc_lst) { 187 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 188 ipv6_addr_equal(&mc_lst->addr, addr)) 189 return -EADDRINUSE; 190 } 191 192 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 193 194 if (!mc_lst) 195 return -ENOMEM; 196 197 mc_lst->next = NULL; 198 mc_lst->addr = *addr; 199 200 if (ifindex == 0) { 201 struct rt6_info *rt; 202 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); 203 if (rt) { 204 dev = rt->dst.dev; 205 ip6_rt_put(rt); 206 } 207 } else 208 dev = __dev_get_by_index(net, ifindex); 209 210 if (!dev) { 211 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 212 return -ENODEV; 213 } 214 215 mc_lst->ifindex = dev->ifindex; 216 mc_lst->sfmode = mode; 217 RCU_INIT_POINTER(mc_lst->sflist, NULL); 218 219 /* 220 * now add/increase the group membership on the device 221 */ 222 223 err = __ipv6_dev_mc_inc(dev, addr, mode); 224 225 if (err) { 226 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 227 return err; 228 } 229 230 mc_lst->next = np->ipv6_mc_list; 231 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 232 233 return 0; 234 } 235 236 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 237 { 238 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 239 } 240 EXPORT_SYMBOL(ipv6_sock_mc_join); 241 242 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 243 const struct in6_addr *addr, unsigned int mode) 244 { 245 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 246 } 247 248 /* 249 * socket leave on multicast group 250 */ 251 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 252 { 253 struct ipv6_pinfo *np = inet6_sk(sk); 254 struct ipv6_mc_socklist *mc_lst; 255 struct ipv6_mc_socklist __rcu **lnk; 256 struct net *net = sock_net(sk); 257 258 ASSERT_RTNL(); 259 260 if (!ipv6_addr_is_multicast(addr)) 261 return -EINVAL; 262 263 for (lnk = &np->ipv6_mc_list; 264 (mc_lst = sock_dereference(*lnk, sk)) != NULL; 265 lnk = &mc_lst->next) { 266 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 267 ipv6_addr_equal(&mc_lst->addr, addr)) { 268 struct net_device *dev; 269 270 *lnk = mc_lst->next; 271 272 dev = __dev_get_by_index(net, mc_lst->ifindex); 273 if (dev) { 274 struct inet6_dev *idev = __in6_dev_get(dev); 275 276 ip6_mc_leave_src(sk, mc_lst, idev); 277 if (idev) 278 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 279 } else { 280 ip6_mc_leave_src(sk, mc_lst, NULL); 281 } 282 283 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 284 kfree_rcu(mc_lst, rcu); 285 return 0; 286 } 287 } 288 289 return -EADDRNOTAVAIL; 290 } 291 EXPORT_SYMBOL(ipv6_sock_mc_drop); 292 293 static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net, 294 const struct in6_addr *group, 295 int ifindex) 296 { 297 struct net_device *dev = NULL; 298 struct inet6_dev *idev = NULL; 299 300 if (ifindex == 0) { 301 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0); 302 303 if (rt) { 304 dev = rt->dst.dev; 305 ip6_rt_put(rt); 306 } 307 } else { 308 dev = __dev_get_by_index(net, ifindex); 309 } 310 311 if (!dev) 312 return NULL; 313 idev = __in6_dev_get(dev); 314 if (!idev) 315 return NULL; 316 if (idev->dead) 317 return NULL; 318 return idev; 319 } 320 321 void __ipv6_sock_mc_close(struct sock *sk) 322 { 323 struct ipv6_pinfo *np = inet6_sk(sk); 324 struct ipv6_mc_socklist *mc_lst; 325 struct net *net = sock_net(sk); 326 327 ASSERT_RTNL(); 328 329 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) { 330 struct net_device *dev; 331 332 np->ipv6_mc_list = mc_lst->next; 333 334 dev = __dev_get_by_index(net, mc_lst->ifindex); 335 if (dev) { 336 struct inet6_dev *idev = __in6_dev_get(dev); 337 338 ip6_mc_leave_src(sk, mc_lst, idev); 339 if (idev) 340 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 341 } else { 342 ip6_mc_leave_src(sk, mc_lst, NULL); 343 } 344 345 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 346 kfree_rcu(mc_lst, rcu); 347 } 348 } 349 350 void ipv6_sock_mc_close(struct sock *sk) 351 { 352 struct ipv6_pinfo *np = inet6_sk(sk); 353 354 if (!rcu_access_pointer(np->ipv6_mc_list)) 355 return; 356 357 rtnl_lock(); 358 lock_sock(sk); 359 __ipv6_sock_mc_close(sk); 360 release_sock(sk); 361 rtnl_unlock(); 362 } 363 364 int ip6_mc_source(int add, int omode, struct sock *sk, 365 struct group_source_req *pgsr) 366 { 367 struct in6_addr *source, *group; 368 struct ipv6_mc_socklist *pmc; 369 struct inet6_dev *idev; 370 struct ipv6_pinfo *inet6 = inet6_sk(sk); 371 struct ip6_sf_socklist *psl; 372 struct net *net = sock_net(sk); 373 int i, j, rv; 374 int leavegroup = 0; 375 int err; 376 377 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 378 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 379 380 if (!ipv6_addr_is_multicast(group)) 381 return -EINVAL; 382 383 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface); 384 if (!idev) 385 return -ENODEV; 386 387 err = -EADDRNOTAVAIL; 388 389 mutex_lock(&idev->mc_lock); 390 for_each_pmc_socklock(inet6, sk, pmc) { 391 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 392 continue; 393 if (ipv6_addr_equal(&pmc->addr, group)) 394 break; 395 } 396 if (!pmc) { /* must have a prior join */ 397 err = -EINVAL; 398 goto done; 399 } 400 /* if a source filter was set, must be the same mode as before */ 401 if (rcu_access_pointer(pmc->sflist)) { 402 if (pmc->sfmode != omode) { 403 err = -EINVAL; 404 goto done; 405 } 406 } else if (pmc->sfmode != omode) { 407 /* allow mode switches for empty-set filters */ 408 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 409 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 410 pmc->sfmode = omode; 411 } 412 413 psl = sock_dereference(pmc->sflist, sk); 414 if (!add) { 415 if (!psl) 416 goto done; /* err = -EADDRNOTAVAIL */ 417 rv = !0; 418 for (i = 0; i < psl->sl_count; i++) { 419 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 420 if (rv == 0) 421 break; 422 } 423 if (rv) /* source not found */ 424 goto done; /* err = -EADDRNOTAVAIL */ 425 426 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 427 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 428 leavegroup = 1; 429 goto done; 430 } 431 432 /* update the interface filter */ 433 ip6_mc_del_src(idev, group, omode, 1, source, 1); 434 435 for (j = i+1; j < psl->sl_count; j++) 436 psl->sl_addr[j-1] = psl->sl_addr[j]; 437 psl->sl_count--; 438 err = 0; 439 goto done; 440 } 441 /* else, add a new source to the filter */ 442 443 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 444 err = -ENOBUFS; 445 goto done; 446 } 447 if (!psl || psl->sl_count == psl->sl_max) { 448 struct ip6_sf_socklist *newpsl; 449 int count = IP6_SFBLOCK; 450 451 if (psl) 452 count += psl->sl_max; 453 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), 454 GFP_KERNEL); 455 if (!newpsl) { 456 err = -ENOBUFS; 457 goto done; 458 } 459 newpsl->sl_max = count; 460 newpsl->sl_count = count - IP6_SFBLOCK; 461 if (psl) { 462 for (i = 0; i < psl->sl_count; i++) 463 newpsl->sl_addr[i] = psl->sl_addr[i]; 464 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 465 &sk->sk_omem_alloc); 466 } 467 rcu_assign_pointer(pmc->sflist, newpsl); 468 kfree_rcu(psl, rcu); 469 psl = newpsl; 470 } 471 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 472 for (i = 0; i < psl->sl_count; i++) { 473 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 474 if (rv == 0) /* There is an error in the address. */ 475 goto done; 476 } 477 for (j = psl->sl_count-1; j >= i; j--) 478 psl->sl_addr[j+1] = psl->sl_addr[j]; 479 psl->sl_addr[i] = *source; 480 psl->sl_count++; 481 err = 0; 482 /* update the interface list */ 483 ip6_mc_add_src(idev, group, omode, 1, source, 1); 484 done: 485 mutex_unlock(&idev->mc_lock); 486 if (leavegroup) 487 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 488 return err; 489 } 490 491 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 492 struct sockaddr_storage *list) 493 { 494 const struct in6_addr *group; 495 struct ipv6_mc_socklist *pmc; 496 struct inet6_dev *idev; 497 struct ipv6_pinfo *inet6 = inet6_sk(sk); 498 struct ip6_sf_socklist *newpsl, *psl; 499 struct net *net = sock_net(sk); 500 int leavegroup = 0; 501 int i, err; 502 503 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 504 505 if (!ipv6_addr_is_multicast(group)) 506 return -EINVAL; 507 if (gsf->gf_fmode != MCAST_INCLUDE && 508 gsf->gf_fmode != MCAST_EXCLUDE) 509 return -EINVAL; 510 511 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface); 512 if (!idev) 513 return -ENODEV; 514 515 err = 0; 516 517 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 518 leavegroup = 1; 519 goto done; 520 } 521 522 for_each_pmc_socklock(inet6, sk, pmc) { 523 if (pmc->ifindex != gsf->gf_interface) 524 continue; 525 if (ipv6_addr_equal(&pmc->addr, group)) 526 break; 527 } 528 if (!pmc) { /* must have a prior join */ 529 err = -EINVAL; 530 goto done; 531 } 532 if (gsf->gf_numsrc) { 533 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, 534 gsf->gf_numsrc), 535 GFP_KERNEL); 536 if (!newpsl) { 537 err = -ENOBUFS; 538 goto done; 539 } 540 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 541 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 542 struct sockaddr_in6 *psin6; 543 544 psin6 = (struct sockaddr_in6 *)list; 545 newpsl->sl_addr[i] = psin6->sin6_addr; 546 } 547 mutex_lock(&idev->mc_lock); 548 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 549 newpsl->sl_count, newpsl->sl_addr, 0); 550 if (err) { 551 mutex_unlock(&idev->mc_lock); 552 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr, 553 newpsl->sl_max)); 554 goto done; 555 } 556 mutex_unlock(&idev->mc_lock); 557 } else { 558 newpsl = NULL; 559 mutex_lock(&idev->mc_lock); 560 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 561 mutex_unlock(&idev->mc_lock); 562 } 563 564 mutex_lock(&idev->mc_lock); 565 psl = sock_dereference(pmc->sflist, sk); 566 if (psl) { 567 ip6_mc_del_src(idev, group, pmc->sfmode, 568 psl->sl_count, psl->sl_addr, 0); 569 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 570 &sk->sk_omem_alloc); 571 } else { 572 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 573 } 574 rcu_assign_pointer(pmc->sflist, newpsl); 575 mutex_unlock(&idev->mc_lock); 576 kfree_rcu(psl, rcu); 577 pmc->sfmode = gsf->gf_fmode; 578 err = 0; 579 done: 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 /* changes to the ipv6_mc_list require the socket lock and 601 * rtnl lock. We have the socket lock, so reading the list is safe. 602 */ 603 604 for_each_pmc_socklock(inet6, sk, pmc) { 605 if (pmc->ifindex != gsf->gf_interface) 606 continue; 607 if (ipv6_addr_equal(group, &pmc->addr)) 608 break; 609 } 610 if (!pmc) /* must have a prior join */ 611 return -EADDRNOTAVAIL; 612 613 gsf->gf_fmode = pmc->sfmode; 614 psl = sock_dereference(pmc->sflist, sk); 615 count = psl ? psl->sl_count : 0; 616 617 copycount = min(count, gsf->gf_numsrc); 618 gsf->gf_numsrc = count; 619 for (i = 0; i < copycount; i++) { 620 struct sockaddr_in6 *psin6; 621 struct sockaddr_storage ss; 622 623 psin6 = (struct sockaddr_in6 *)&ss; 624 memset(&ss, 0, sizeof(ss)); 625 psin6->sin6_family = AF_INET6; 626 psin6->sin6_addr = psl->sl_addr[i]; 627 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss))) 628 return -EFAULT; 629 ss_offset += sizeof(ss); 630 } 631 return 0; 632 } 633 634 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, 635 const struct in6_addr *src_addr) 636 { 637 const struct ipv6_pinfo *np = inet6_sk(sk); 638 const struct ipv6_mc_socklist *mc; 639 const struct ip6_sf_socklist *psl; 640 bool rv = true; 641 642 rcu_read_lock(); 643 for_each_pmc_rcu(np, mc) { 644 if (ipv6_addr_equal(&mc->addr, mc_addr)) 645 break; 646 } 647 if (!mc) { 648 rcu_read_unlock(); 649 return inet6_test_bit(MC6_ALL, sk); 650 } 651 psl = rcu_dereference(mc->sflist); 652 if (!psl) { 653 rv = mc->sfmode == MCAST_EXCLUDE; 654 } else { 655 int i; 656 657 for (i = 0; i < psl->sl_count; i++) { 658 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 659 break; 660 } 661 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 662 rv = false; 663 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 664 rv = false; 665 } 666 rcu_read_unlock(); 667 668 return rv; 669 } 670 671 /* called with mc_lock */ 672 static void igmp6_group_added(struct ifmcaddr6 *mc) 673 { 674 struct net_device *dev = mc->idev->dev; 675 char buf[MAX_ADDR_LEN]; 676 677 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 678 IPV6_ADDR_SCOPE_LINKLOCAL) 679 return; 680 681 if (!(mc->mca_flags&MAF_LOADED)) { 682 mc->mca_flags |= MAF_LOADED; 683 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 684 dev_mc_add(dev, buf); 685 } 686 687 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 688 return; 689 690 if (mld_in_v1_mode(mc->idev)) { 691 igmp6_join_group(mc); 692 return; 693 } 694 /* else v2 */ 695 696 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 697 * should not send filter-mode change record as the mode 698 * should be from IN() to IN(A). 699 */ 700 if (mc->mca_sfmode == MCAST_EXCLUDE) 701 mc->mca_crcount = mc->idev->mc_qrv; 702 703 mld_ifc_event(mc->idev); 704 } 705 706 /* called with mc_lock */ 707 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 708 { 709 struct net_device *dev = mc->idev->dev; 710 char buf[MAX_ADDR_LEN]; 711 712 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 713 IPV6_ADDR_SCOPE_LINKLOCAL) 714 return; 715 716 if (mc->mca_flags&MAF_LOADED) { 717 mc->mca_flags &= ~MAF_LOADED; 718 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 719 dev_mc_del(dev, buf); 720 } 721 722 if (mc->mca_flags & MAF_NOREPORT) 723 return; 724 725 if (!mc->idev->dead) 726 igmp6_leave_group(mc); 727 728 if (cancel_delayed_work(&mc->mca_work)) 729 refcount_dec(&mc->mca_refcnt); 730 } 731 732 /* 733 * deleted ifmcaddr6 manipulation 734 * called with mc_lock 735 */ 736 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 737 { 738 struct ifmcaddr6 *pmc; 739 740 /* this is an "ifmcaddr6" for convenience; only the fields below 741 * are actually used. In particular, the refcnt and users are not 742 * used for management of the delete list. Using the same structure 743 * for deleted items allows change reports to use common code with 744 * non-deleted or query-response MCA's. 745 */ 746 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 747 if (!pmc) 748 return; 749 750 pmc->idev = im->idev; 751 in6_dev_hold(idev); 752 pmc->mca_addr = im->mca_addr; 753 pmc->mca_crcount = idev->mc_qrv; 754 pmc->mca_sfmode = im->mca_sfmode; 755 if (pmc->mca_sfmode == MCAST_INCLUDE) { 756 struct ip6_sf_list *psf; 757 758 rcu_assign_pointer(pmc->mca_tomb, 759 mc_dereference(im->mca_tomb, idev)); 760 rcu_assign_pointer(pmc->mca_sources, 761 mc_dereference(im->mca_sources, idev)); 762 RCU_INIT_POINTER(im->mca_tomb, NULL); 763 RCU_INIT_POINTER(im->mca_sources, NULL); 764 765 for_each_psf_mclock(pmc, psf) 766 psf->sf_crcount = pmc->mca_crcount; 767 } 768 769 rcu_assign_pointer(pmc->next, idev->mc_tomb); 770 rcu_assign_pointer(idev->mc_tomb, pmc); 771 } 772 773 /* called with mc_lock */ 774 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 775 { 776 struct ip6_sf_list *psf, *sources, *tomb; 777 struct in6_addr *pmca = &im->mca_addr; 778 struct ifmcaddr6 *pmc, *pmc_prev; 779 780 pmc_prev = NULL; 781 for_each_mc_tomb(idev, pmc) { 782 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 783 break; 784 pmc_prev = pmc; 785 } 786 if (pmc) { 787 if (pmc_prev) 788 rcu_assign_pointer(pmc_prev->next, pmc->next); 789 else 790 rcu_assign_pointer(idev->mc_tomb, pmc->next); 791 } 792 793 if (pmc) { 794 im->idev = pmc->idev; 795 if (im->mca_sfmode == MCAST_INCLUDE) { 796 tomb = rcu_replace_pointer(im->mca_tomb, 797 mc_dereference(pmc->mca_tomb, pmc->idev), 798 lockdep_is_held(&im->idev->mc_lock)); 799 rcu_assign_pointer(pmc->mca_tomb, tomb); 800 801 sources = rcu_replace_pointer(im->mca_sources, 802 mc_dereference(pmc->mca_sources, pmc->idev), 803 lockdep_is_held(&im->idev->mc_lock)); 804 rcu_assign_pointer(pmc->mca_sources, sources); 805 for_each_psf_mclock(im, psf) 806 psf->sf_crcount = idev->mc_qrv; 807 } else { 808 im->mca_crcount = idev->mc_qrv; 809 } 810 in6_dev_put(pmc->idev); 811 ip6_mc_clear_src(pmc); 812 kfree_rcu(pmc, rcu); 813 } 814 } 815 816 /* called with mc_lock */ 817 static void mld_clear_delrec(struct inet6_dev *idev) 818 { 819 struct ifmcaddr6 *pmc, *nextpmc; 820 821 pmc = mc_dereference(idev->mc_tomb, idev); 822 RCU_INIT_POINTER(idev->mc_tomb, NULL); 823 824 for (; pmc; pmc = nextpmc) { 825 nextpmc = mc_dereference(pmc->next, idev); 826 ip6_mc_clear_src(pmc); 827 in6_dev_put(pmc->idev); 828 kfree_rcu(pmc, rcu); 829 } 830 831 /* clear dead sources, too */ 832 for_each_mc_mclock(idev, pmc) { 833 struct ip6_sf_list *psf, *psf_next; 834 835 psf = mc_dereference(pmc->mca_tomb, idev); 836 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 837 for (; psf; psf = psf_next) { 838 psf_next = mc_dereference(psf->sf_next, idev); 839 kfree_rcu(psf, rcu); 840 } 841 } 842 } 843 844 static void mld_clear_query(struct inet6_dev *idev) 845 { 846 struct sk_buff *skb; 847 848 spin_lock_bh(&idev->mc_query_lock); 849 while ((skb = __skb_dequeue(&idev->mc_query_queue))) 850 kfree_skb(skb); 851 spin_unlock_bh(&idev->mc_query_lock); 852 } 853 854 static void mld_clear_report(struct inet6_dev *idev) 855 { 856 struct sk_buff *skb; 857 858 spin_lock_bh(&idev->mc_report_lock); 859 while ((skb = __skb_dequeue(&idev->mc_report_queue))) 860 kfree_skb(skb); 861 spin_unlock_bh(&idev->mc_report_lock); 862 } 863 864 static void mca_get(struct ifmcaddr6 *mc) 865 { 866 refcount_inc(&mc->mca_refcnt); 867 } 868 869 static void ma_put(struct ifmcaddr6 *mc) 870 { 871 if (refcount_dec_and_test(&mc->mca_refcnt)) { 872 in6_dev_put(mc->idev); 873 kfree_rcu(mc, rcu); 874 } 875 } 876 877 /* called with mc_lock */ 878 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 879 const struct in6_addr *addr, 880 unsigned int mode) 881 { 882 struct ifmcaddr6 *mc; 883 884 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 885 if (!mc) 886 return NULL; 887 888 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 889 890 mc->mca_addr = *addr; 891 mc->idev = idev; /* reference taken by caller */ 892 mc->mca_users = 1; 893 /* mca_stamp should be updated upon changes */ 894 mc->mca_cstamp = mc->mca_tstamp = jiffies; 895 refcount_set(&mc->mca_refcnt, 1); 896 897 mc->mca_sfmode = mode; 898 mc->mca_sfcount[mode] = 1; 899 900 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 901 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 902 mc->mca_flags |= MAF_NOREPORT; 903 904 return mc; 905 } 906 907 static void inet6_ifmcaddr_notify(struct net_device *dev, 908 const struct ifmcaddr6 *ifmca, int event) 909 { 910 struct inet6_fill_args fillargs = { 911 .portid = 0, 912 .seq = 0, 913 .event = event, 914 .flags = 0, 915 .netnsid = -1, 916 .force_rt_scope_universe = true, 917 }; 918 struct net *net = dev_net(dev); 919 struct sk_buff *skb; 920 int err = -ENOMEM; 921 922 skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + 923 nla_total_size(sizeof(struct in6_addr)) + 924 nla_total_size(sizeof(struct ifa_cacheinfo)), 925 GFP_KERNEL); 926 if (!skb) 927 goto error; 928 929 err = inet6_fill_ifmcaddr(skb, ifmca, &fillargs); 930 if (err < 0) { 931 WARN_ON_ONCE(err == -EMSGSIZE); 932 nlmsg_free(skb); 933 goto error; 934 } 935 936 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MCADDR, NULL, GFP_KERNEL); 937 return; 938 error: 939 rtnl_set_sk_err(net, RTNLGRP_IPV6_MCADDR, err); 940 } 941 942 /* 943 * device multicast group inc (add if not found) 944 */ 945 static int __ipv6_dev_mc_inc(struct net_device *dev, 946 const struct in6_addr *addr, unsigned int mode) 947 { 948 struct ifmcaddr6 *mc; 949 struct inet6_dev *idev; 950 951 ASSERT_RTNL(); 952 953 /* we need to take a reference on idev */ 954 idev = in6_dev_get(dev); 955 956 if (!idev) 957 return -EINVAL; 958 959 if (idev->dead) { 960 in6_dev_put(idev); 961 return -ENODEV; 962 } 963 964 mutex_lock(&idev->mc_lock); 965 for_each_mc_mclock(idev, mc) { 966 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 967 mc->mca_users++; 968 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 969 mutex_unlock(&idev->mc_lock); 970 in6_dev_put(idev); 971 return 0; 972 } 973 } 974 975 mc = mca_alloc(idev, addr, mode); 976 if (!mc) { 977 mutex_unlock(&idev->mc_lock); 978 in6_dev_put(idev); 979 return -ENOMEM; 980 } 981 982 rcu_assign_pointer(mc->next, idev->mc_list); 983 rcu_assign_pointer(idev->mc_list, mc); 984 985 mca_get(mc); 986 987 mld_del_delrec(idev, mc); 988 igmp6_group_added(mc); 989 inet6_ifmcaddr_notify(dev, mc, RTM_NEWMULTICAST); 990 mutex_unlock(&idev->mc_lock); 991 ma_put(mc); 992 return 0; 993 } 994 995 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 996 { 997 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 998 } 999 EXPORT_SYMBOL(ipv6_dev_mc_inc); 1000 1001 /* 1002 * device multicast group del 1003 */ 1004 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 1005 { 1006 struct ifmcaddr6 *ma, __rcu **map; 1007 1008 ASSERT_RTNL(); 1009 1010 mutex_lock(&idev->mc_lock); 1011 for (map = &idev->mc_list; 1012 (ma = mc_dereference(*map, idev)); 1013 map = &ma->next) { 1014 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 1015 if (--ma->mca_users == 0) { 1016 *map = ma->next; 1017 1018 igmp6_group_dropped(ma); 1019 inet6_ifmcaddr_notify(idev->dev, ma, 1020 RTM_DELMULTICAST); 1021 ip6_mc_clear_src(ma); 1022 mutex_unlock(&idev->mc_lock); 1023 1024 ma_put(ma); 1025 return 0; 1026 } 1027 mutex_unlock(&idev->mc_lock); 1028 return 0; 1029 } 1030 } 1031 1032 mutex_unlock(&idev->mc_lock); 1033 return -ENOENT; 1034 } 1035 1036 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 1037 { 1038 struct inet6_dev *idev; 1039 int err; 1040 1041 ASSERT_RTNL(); 1042 1043 idev = __in6_dev_get(dev); 1044 if (!idev) 1045 err = -ENODEV; 1046 else 1047 err = __ipv6_dev_mc_dec(idev, addr); 1048 1049 return err; 1050 } 1051 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1052 1053 /* 1054 * check if the interface/address pair is valid 1055 */ 1056 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1057 const struct in6_addr *src_addr) 1058 { 1059 struct inet6_dev *idev; 1060 struct ifmcaddr6 *mc; 1061 bool rv = false; 1062 1063 rcu_read_lock(); 1064 idev = __in6_dev_get(dev); 1065 if (!idev) 1066 goto unlock; 1067 for_each_mc_rcu(idev, mc) { 1068 if (ipv6_addr_equal(&mc->mca_addr, group)) 1069 break; 1070 } 1071 if (!mc) 1072 goto unlock; 1073 if (src_addr && !ipv6_addr_any(src_addr)) { 1074 struct ip6_sf_list *psf; 1075 1076 for_each_psf_rcu(mc, psf) { 1077 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1078 break; 1079 } 1080 if (psf) 1081 rv = READ_ONCE(psf->sf_count[MCAST_INCLUDE]) || 1082 READ_ONCE(psf->sf_count[MCAST_EXCLUDE]) != 1083 READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]); 1084 else 1085 rv = READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]) != 0; 1086 } else { 1087 rv = true; /* don't filter unspecified source */ 1088 } 1089 unlock: 1090 rcu_read_unlock(); 1091 return rv; 1092 } 1093 1094 /* called with mc_lock */ 1095 static void mld_gq_start_work(struct inet6_dev *idev) 1096 { 1097 unsigned long tv = get_random_u32_below(idev->mc_maxdelay); 1098 1099 idev->mc_gq_running = 1; 1100 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1101 in6_dev_hold(idev); 1102 } 1103 1104 /* called with mc_lock */ 1105 static void mld_gq_stop_work(struct inet6_dev *idev) 1106 { 1107 idev->mc_gq_running = 0; 1108 if (cancel_delayed_work(&idev->mc_gq_work)) 1109 __in6_dev_put(idev); 1110 } 1111 1112 /* called with mc_lock */ 1113 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1114 { 1115 unsigned long tv = get_random_u32_below(delay); 1116 1117 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1118 in6_dev_hold(idev); 1119 } 1120 1121 /* called with mc_lock */ 1122 static void mld_ifc_stop_work(struct inet6_dev *idev) 1123 { 1124 idev->mc_ifc_count = 0; 1125 if (cancel_delayed_work(&idev->mc_ifc_work)) 1126 __in6_dev_put(idev); 1127 } 1128 1129 /* called with mc_lock */ 1130 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1131 { 1132 unsigned long tv = get_random_u32_below(delay); 1133 1134 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1135 in6_dev_hold(idev); 1136 } 1137 1138 static void mld_dad_stop_work(struct inet6_dev *idev) 1139 { 1140 if (cancel_delayed_work(&idev->mc_dad_work)) 1141 __in6_dev_put(idev); 1142 } 1143 1144 static void mld_query_stop_work(struct inet6_dev *idev) 1145 { 1146 spin_lock_bh(&idev->mc_query_lock); 1147 if (cancel_delayed_work(&idev->mc_query_work)) 1148 __in6_dev_put(idev); 1149 spin_unlock_bh(&idev->mc_query_lock); 1150 } 1151 1152 static void mld_report_stop_work(struct inet6_dev *idev) 1153 { 1154 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1155 __in6_dev_put(idev); 1156 } 1157 1158 /* 1159 * IGMP handling (alias multicast ICMPv6 messages) 1160 * called with mc_lock 1161 */ 1162 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1163 { 1164 unsigned long delay = resptime; 1165 1166 /* Do not start work for these addresses */ 1167 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1168 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1169 return; 1170 1171 if (cancel_delayed_work(&ma->mca_work)) { 1172 refcount_dec(&ma->mca_refcnt); 1173 delay = ma->mca_work.timer.expires - jiffies; 1174 } 1175 1176 if (delay >= resptime) 1177 delay = get_random_u32_below(resptime); 1178 1179 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1180 refcount_inc(&ma->mca_refcnt); 1181 ma->mca_flags |= MAF_TIMER_RUNNING; 1182 } 1183 1184 /* mark EXCLUDE-mode sources 1185 * called with mc_lock 1186 */ 1187 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1188 const struct in6_addr *srcs) 1189 { 1190 struct ip6_sf_list *psf; 1191 int i, scount; 1192 1193 scount = 0; 1194 for_each_psf_mclock(pmc, psf) { 1195 if (scount == nsrcs) 1196 break; 1197 for (i = 0; i < nsrcs; i++) { 1198 /* skip inactive filters */ 1199 if (psf->sf_count[MCAST_INCLUDE] || 1200 pmc->mca_sfcount[MCAST_EXCLUDE] != 1201 psf->sf_count[MCAST_EXCLUDE]) 1202 break; 1203 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1204 scount++; 1205 break; 1206 } 1207 } 1208 } 1209 pmc->mca_flags &= ~MAF_GSQUERY; 1210 if (scount == nsrcs) /* all sources excluded */ 1211 return false; 1212 return true; 1213 } 1214 1215 /* called with mc_lock */ 1216 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1217 const struct in6_addr *srcs) 1218 { 1219 struct ip6_sf_list *psf; 1220 int i, scount; 1221 1222 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1223 return mld_xmarksources(pmc, nsrcs, srcs); 1224 1225 /* mark INCLUDE-mode sources */ 1226 1227 scount = 0; 1228 for_each_psf_mclock(pmc, psf) { 1229 if (scount == nsrcs) 1230 break; 1231 for (i = 0; i < nsrcs; i++) { 1232 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1233 psf->sf_gsresp = 1; 1234 scount++; 1235 break; 1236 } 1237 } 1238 } 1239 if (!scount) { 1240 pmc->mca_flags &= ~MAF_GSQUERY; 1241 return false; 1242 } 1243 pmc->mca_flags |= MAF_GSQUERY; 1244 return true; 1245 } 1246 1247 static int mld_force_mld_version(const struct inet6_dev *idev) 1248 { 1249 const struct net *net = dev_net(idev->dev); 1250 int all_force; 1251 1252 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1253 /* Normally, both are 0 here. If enforcement to a particular is 1254 * being used, individual device enforcement will have a lower 1255 * precedence over 'all' device (.../conf/all/force_mld_version). 1256 */ 1257 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1258 } 1259 1260 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1261 { 1262 return mld_force_mld_version(idev) == 2; 1263 } 1264 1265 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1266 { 1267 return mld_force_mld_version(idev) == 1; 1268 } 1269 1270 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1271 { 1272 if (mld_in_v2_mode_only(idev)) 1273 return false; 1274 if (mld_in_v1_mode_only(idev)) 1275 return true; 1276 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1277 return true; 1278 1279 return false; 1280 } 1281 1282 static void mld_set_v1_mode(struct inet6_dev *idev) 1283 { 1284 /* RFC3810, relevant sections: 1285 * - 9.1. Robustness Variable 1286 * - 9.2. Query Interval 1287 * - 9.3. Query Response Interval 1288 * - 9.12. Older Version Querier Present Timeout 1289 */ 1290 unsigned long switchback; 1291 1292 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1293 1294 idev->mc_v1_seen = jiffies + switchback; 1295 } 1296 1297 static void mld_update_qrv(struct inet6_dev *idev, 1298 const struct mld2_query *mlh2) 1299 { 1300 /* RFC3810, relevant sections: 1301 * - 5.1.8. QRV (Querier's Robustness Variable) 1302 * - 9.1. Robustness Variable 1303 */ 1304 1305 /* The value of the Robustness Variable MUST NOT be zero, 1306 * and SHOULD NOT be one. Catch this here if we ever run 1307 * into such a case in future. 1308 */ 1309 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1310 WARN_ON(idev->mc_qrv == 0); 1311 1312 if (mlh2->mld2q_qrv > 0) 1313 idev->mc_qrv = mlh2->mld2q_qrv; 1314 1315 if (unlikely(idev->mc_qrv < min_qrv)) { 1316 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1317 idev->mc_qrv, min_qrv); 1318 idev->mc_qrv = min_qrv; 1319 } 1320 } 1321 1322 static void mld_update_qi(struct inet6_dev *idev, 1323 const struct mld2_query *mlh2) 1324 { 1325 /* RFC3810, relevant sections: 1326 * - 5.1.9. QQIC (Querier's Query Interval Code) 1327 * - 9.2. Query Interval 1328 * - 9.12. Older Version Querier Present Timeout 1329 * (the [Query Interval] in the last Query received) 1330 */ 1331 unsigned long mc_qqi; 1332 1333 if (mlh2->mld2q_qqic < 128) { 1334 mc_qqi = mlh2->mld2q_qqic; 1335 } else { 1336 unsigned long mc_man, mc_exp; 1337 1338 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1339 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1340 1341 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1342 } 1343 1344 idev->mc_qi = mc_qqi * HZ; 1345 } 1346 1347 static void mld_update_qri(struct inet6_dev *idev, 1348 const struct mld2_query *mlh2) 1349 { 1350 /* RFC3810, relevant sections: 1351 * - 5.1.3. Maximum Response Code 1352 * - 9.3. Query Response Interval 1353 */ 1354 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1355 } 1356 1357 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1358 unsigned long *max_delay, bool v1_query) 1359 { 1360 unsigned long mldv1_md; 1361 1362 /* Ignore v1 queries */ 1363 if (mld_in_v2_mode_only(idev)) 1364 return -EINVAL; 1365 1366 mldv1_md = ntohs(mld->mld_maxdelay); 1367 1368 /* When in MLDv1 fallback and a MLDv2 router start-up being 1369 * unaware of current MLDv1 operation, the MRC == MRD mapping 1370 * only works when the exponential algorithm is not being 1371 * used (as MLDv1 is unaware of such things). 1372 * 1373 * According to the RFC author, the MLDv2 implementations 1374 * he's aware of all use a MRC < 32768 on start up queries. 1375 * 1376 * Thus, should we *ever* encounter something else larger 1377 * than that, just assume the maximum possible within our 1378 * reach. 1379 */ 1380 if (!v1_query) 1381 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1382 1383 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1384 1385 /* MLDv1 router present: we need to go into v1 mode *only* 1386 * when an MLDv1 query is received as per section 9.12. of 1387 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1388 * queries MUST be of exactly 24 octets. 1389 */ 1390 if (v1_query) 1391 mld_set_v1_mode(idev); 1392 1393 /* cancel MLDv2 report work */ 1394 mld_gq_stop_work(idev); 1395 /* cancel the interface change work */ 1396 mld_ifc_stop_work(idev); 1397 /* clear deleted report items */ 1398 mld_clear_delrec(idev); 1399 1400 return 0; 1401 } 1402 1403 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1404 unsigned long *max_delay) 1405 { 1406 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1407 1408 mld_update_qrv(idev, mld); 1409 mld_update_qi(idev, mld); 1410 mld_update_qri(idev, mld); 1411 1412 idev->mc_maxdelay = *max_delay; 1413 1414 return; 1415 } 1416 1417 /* called with rcu_read_lock() */ 1418 void igmp6_event_query(struct sk_buff *skb) 1419 { 1420 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1421 1422 if (!idev || idev->dead) 1423 goto out; 1424 1425 spin_lock_bh(&idev->mc_query_lock); 1426 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1427 __skb_queue_tail(&idev->mc_query_queue, skb); 1428 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1429 in6_dev_hold(idev); 1430 skb = NULL; 1431 } 1432 spin_unlock_bh(&idev->mc_query_lock); 1433 out: 1434 kfree_skb(skb); 1435 } 1436 1437 static void __mld_query_work(struct sk_buff *skb) 1438 { 1439 struct mld2_query *mlh2 = NULL; 1440 const struct in6_addr *group; 1441 unsigned long max_delay; 1442 struct inet6_dev *idev; 1443 struct ifmcaddr6 *ma; 1444 struct mld_msg *mld; 1445 int group_type; 1446 int mark = 0; 1447 int len, err; 1448 1449 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1450 goto kfree_skb; 1451 1452 /* compute payload length excluding extension headers */ 1453 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1454 len -= skb_network_header_len(skb); 1455 1456 /* RFC3810 6.2 1457 * Upon reception of an MLD message that contains a Query, the node 1458 * checks if the source address of the message is a valid link-local 1459 * address, if the Hop Limit is set to 1, and if the Router Alert 1460 * option is present in the Hop-By-Hop Options header of the IPv6 1461 * packet. If any of these checks fails, the packet is dropped. 1462 */ 1463 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1464 ipv6_hdr(skb)->hop_limit != 1 || 1465 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1466 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1467 goto kfree_skb; 1468 1469 idev = in6_dev_get(skb->dev); 1470 if (!idev) 1471 goto kfree_skb; 1472 1473 mld = (struct mld_msg *)icmp6_hdr(skb); 1474 group = &mld->mld_mca; 1475 group_type = ipv6_addr_type(group); 1476 1477 if (group_type != IPV6_ADDR_ANY && 1478 !(group_type&IPV6_ADDR_MULTICAST)) 1479 goto out; 1480 1481 if (len < MLD_V1_QUERY_LEN) { 1482 goto out; 1483 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1484 err = mld_process_v1(idev, mld, &max_delay, 1485 len == MLD_V1_QUERY_LEN); 1486 if (err < 0) 1487 goto out; 1488 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1489 int srcs_offset = sizeof(struct mld2_query) - 1490 sizeof(struct icmp6hdr); 1491 1492 if (!pskb_may_pull(skb, srcs_offset)) 1493 goto out; 1494 1495 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1496 1497 mld_process_v2(idev, mlh2, &max_delay); 1498 1499 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1500 if (mlh2->mld2q_nsrcs) 1501 goto out; /* no sources allowed */ 1502 1503 mld_gq_start_work(idev); 1504 goto out; 1505 } 1506 /* mark sources to include, if group & source-specific */ 1507 if (mlh2->mld2q_nsrcs != 0) { 1508 if (!pskb_may_pull(skb, srcs_offset + 1509 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1510 goto out; 1511 1512 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1513 mark = 1; 1514 } 1515 } else { 1516 goto out; 1517 } 1518 1519 if (group_type == IPV6_ADDR_ANY) { 1520 for_each_mc_mclock(idev, ma) { 1521 igmp6_group_queried(ma, max_delay); 1522 } 1523 } else { 1524 for_each_mc_mclock(idev, ma) { 1525 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1526 continue; 1527 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1528 /* gsquery <- gsquery && mark */ 1529 if (!mark) 1530 ma->mca_flags &= ~MAF_GSQUERY; 1531 } else { 1532 /* gsquery <- mark */ 1533 if (mark) 1534 ma->mca_flags |= MAF_GSQUERY; 1535 else 1536 ma->mca_flags &= ~MAF_GSQUERY; 1537 } 1538 if (!(ma->mca_flags & MAF_GSQUERY) || 1539 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1540 igmp6_group_queried(ma, max_delay); 1541 break; 1542 } 1543 } 1544 1545 out: 1546 in6_dev_put(idev); 1547 kfree_skb: 1548 consume_skb(skb); 1549 } 1550 1551 static void mld_query_work(struct work_struct *work) 1552 { 1553 struct inet6_dev *idev = container_of(to_delayed_work(work), 1554 struct inet6_dev, 1555 mc_query_work); 1556 struct sk_buff_head q; 1557 struct sk_buff *skb; 1558 bool rework = false; 1559 int cnt = 0; 1560 1561 skb_queue_head_init(&q); 1562 1563 spin_lock_bh(&idev->mc_query_lock); 1564 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1565 __skb_queue_tail(&q, skb); 1566 1567 if (++cnt >= MLD_MAX_QUEUE) { 1568 rework = true; 1569 break; 1570 } 1571 } 1572 spin_unlock_bh(&idev->mc_query_lock); 1573 1574 mutex_lock(&idev->mc_lock); 1575 while ((skb = __skb_dequeue(&q))) 1576 __mld_query_work(skb); 1577 mutex_unlock(&idev->mc_lock); 1578 1579 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1580 return; 1581 1582 in6_dev_put(idev); 1583 } 1584 1585 /* called with rcu_read_lock() */ 1586 void igmp6_event_report(struct sk_buff *skb) 1587 { 1588 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1589 1590 if (!idev || idev->dead) 1591 goto out; 1592 1593 spin_lock_bh(&idev->mc_report_lock); 1594 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1595 __skb_queue_tail(&idev->mc_report_queue, skb); 1596 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1597 in6_dev_hold(idev); 1598 skb = NULL; 1599 } 1600 spin_unlock_bh(&idev->mc_report_lock); 1601 out: 1602 kfree_skb(skb); 1603 } 1604 1605 static void __mld_report_work(struct sk_buff *skb) 1606 { 1607 struct inet6_dev *idev; 1608 struct ifmcaddr6 *ma; 1609 struct mld_msg *mld; 1610 int addr_type; 1611 1612 /* Our own report looped back. Ignore it. */ 1613 if (skb->pkt_type == PACKET_LOOPBACK) 1614 goto kfree_skb; 1615 1616 /* send our report if the MC router may not have heard this report */ 1617 if (skb->pkt_type != PACKET_MULTICAST && 1618 skb->pkt_type != PACKET_BROADCAST) 1619 goto kfree_skb; 1620 1621 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1622 goto kfree_skb; 1623 1624 mld = (struct mld_msg *)icmp6_hdr(skb); 1625 1626 /* Drop reports with not link local source */ 1627 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1628 if (addr_type != IPV6_ADDR_ANY && 1629 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1630 goto kfree_skb; 1631 1632 idev = in6_dev_get(skb->dev); 1633 if (!idev) 1634 goto kfree_skb; 1635 1636 /* 1637 * Cancel the work for this group 1638 */ 1639 1640 for_each_mc_mclock(idev, ma) { 1641 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1642 if (cancel_delayed_work(&ma->mca_work)) 1643 refcount_dec(&ma->mca_refcnt); 1644 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1645 MAF_TIMER_RUNNING); 1646 break; 1647 } 1648 } 1649 1650 in6_dev_put(idev); 1651 kfree_skb: 1652 consume_skb(skb); 1653 } 1654 1655 static void mld_report_work(struct work_struct *work) 1656 { 1657 struct inet6_dev *idev = container_of(to_delayed_work(work), 1658 struct inet6_dev, 1659 mc_report_work); 1660 struct sk_buff_head q; 1661 struct sk_buff *skb; 1662 bool rework = false; 1663 int cnt = 0; 1664 1665 skb_queue_head_init(&q); 1666 spin_lock_bh(&idev->mc_report_lock); 1667 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1668 __skb_queue_tail(&q, skb); 1669 1670 if (++cnt >= MLD_MAX_QUEUE) { 1671 rework = true; 1672 break; 1673 } 1674 } 1675 spin_unlock_bh(&idev->mc_report_lock); 1676 1677 mutex_lock(&idev->mc_lock); 1678 while ((skb = __skb_dequeue(&q))) 1679 __mld_report_work(skb); 1680 mutex_unlock(&idev->mc_lock); 1681 1682 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1683 return; 1684 1685 in6_dev_put(idev); 1686 } 1687 1688 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1689 int gdeleted, int sdeleted) 1690 { 1691 switch (type) { 1692 case MLD2_MODE_IS_INCLUDE: 1693 case MLD2_MODE_IS_EXCLUDE: 1694 if (gdeleted || sdeleted) 1695 return false; 1696 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1697 if (pmc->mca_sfmode == MCAST_INCLUDE) 1698 return true; 1699 /* don't include if this source is excluded 1700 * in all filters 1701 */ 1702 if (psf->sf_count[MCAST_INCLUDE]) 1703 return type == MLD2_MODE_IS_INCLUDE; 1704 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1705 psf->sf_count[MCAST_EXCLUDE]; 1706 } 1707 return false; 1708 case MLD2_CHANGE_TO_INCLUDE: 1709 if (gdeleted || sdeleted) 1710 return false; 1711 return psf->sf_count[MCAST_INCLUDE] != 0; 1712 case MLD2_CHANGE_TO_EXCLUDE: 1713 if (gdeleted || sdeleted) 1714 return false; 1715 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1716 psf->sf_count[MCAST_INCLUDE]) 1717 return false; 1718 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1719 psf->sf_count[MCAST_EXCLUDE]; 1720 case MLD2_ALLOW_NEW_SOURCES: 1721 if (gdeleted || !psf->sf_crcount) 1722 return false; 1723 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1724 case MLD2_BLOCK_OLD_SOURCES: 1725 if (pmc->mca_sfmode == MCAST_INCLUDE) 1726 return gdeleted || (psf->sf_crcount && sdeleted); 1727 return psf->sf_crcount && !gdeleted && !sdeleted; 1728 } 1729 return false; 1730 } 1731 1732 static int 1733 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1734 { 1735 struct ip6_sf_list *psf; 1736 int scount = 0; 1737 1738 for_each_psf_mclock(pmc, psf) { 1739 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1740 continue; 1741 scount++; 1742 } 1743 return scount; 1744 } 1745 1746 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1747 struct net_device *dev, const struct in6_addr *saddr, 1748 const struct in6_addr *daddr, int proto, int len) 1749 { 1750 struct ipv6hdr *hdr; 1751 1752 skb->protocol = htons(ETH_P_IPV6); 1753 skb->dev = dev; 1754 1755 skb_reset_network_header(skb); 1756 skb_put(skb, sizeof(struct ipv6hdr)); 1757 hdr = ipv6_hdr(skb); 1758 1759 ip6_flow_hdr(hdr, 0, 0); 1760 1761 hdr->payload_len = htons(len); 1762 hdr->nexthdr = proto; 1763 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1764 1765 hdr->saddr = *saddr; 1766 hdr->daddr = *daddr; 1767 } 1768 1769 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1770 { 1771 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1772 2, 0, 0, IPV6_TLV_PADN, 0 }; 1773 struct net_device *dev = idev->dev; 1774 int hlen = LL_RESERVED_SPACE(dev); 1775 int tlen = dev->needed_tailroom; 1776 const struct in6_addr *saddr; 1777 struct in6_addr addr_buf; 1778 struct mld2_report *pmr; 1779 struct sk_buff *skb; 1780 unsigned int size; 1781 struct sock *sk; 1782 struct net *net; 1783 1784 /* we assume size > sizeof(ra) here 1785 * Also try to not allocate high-order pages for big MTU 1786 */ 1787 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1788 skb = alloc_skb(size, GFP_KERNEL); 1789 if (!skb) 1790 return NULL; 1791 1792 skb->priority = TC_PRIO_CONTROL; 1793 skb_reserve(skb, hlen); 1794 skb_tailroom_reserve(skb, mtu, tlen); 1795 1796 rcu_read_lock(); 1797 1798 net = dev_net_rcu(dev); 1799 sk = net->ipv6.igmp_sk; 1800 skb_set_owner_w(skb, sk); 1801 1802 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1803 /* <draft-ietf-magma-mld-source-05.txt>: 1804 * use unspecified address as the source address 1805 * when a valid link-local address is not available. 1806 */ 1807 saddr = &in6addr_any; 1808 } else 1809 saddr = &addr_buf; 1810 1811 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1812 1813 rcu_read_unlock(); 1814 1815 skb_put_data(skb, ra, sizeof(ra)); 1816 1817 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1818 skb_put(skb, sizeof(*pmr)); 1819 pmr = (struct mld2_report *)skb_transport_header(skb); 1820 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1821 pmr->mld2r_resv1 = 0; 1822 pmr->mld2r_cksum = 0; 1823 pmr->mld2r_resv2 = 0; 1824 pmr->mld2r_ngrec = 0; 1825 return skb; 1826 } 1827 1828 static void mld_sendpack(struct sk_buff *skb) 1829 { 1830 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1831 struct mld2_report *pmr = 1832 (struct mld2_report *)skb_transport_header(skb); 1833 int payload_len, mldlen; 1834 struct inet6_dev *idev; 1835 struct net *net = dev_net(skb->dev); 1836 int err; 1837 struct flowi6 fl6; 1838 struct dst_entry *dst; 1839 1840 rcu_read_lock(); 1841 idev = __in6_dev_get(skb->dev); 1842 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1843 1844 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1845 sizeof(*pip6); 1846 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1847 pip6->payload_len = htons(payload_len); 1848 1849 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1850 IPPROTO_ICMPV6, 1851 csum_partial(skb_transport_header(skb), 1852 mldlen, 0)); 1853 1854 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1855 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1856 skb->dev->ifindex); 1857 dst = icmp6_dst_alloc(skb->dev, &fl6); 1858 1859 err = 0; 1860 if (IS_ERR(dst)) { 1861 err = PTR_ERR(dst); 1862 dst = NULL; 1863 } 1864 skb_dst_set(skb, dst); 1865 if (err) 1866 goto err_out; 1867 1868 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1869 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1870 dst_output); 1871 out: 1872 if (!err) { 1873 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1874 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1875 } else { 1876 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1877 } 1878 1879 rcu_read_unlock(); 1880 return; 1881 1882 err_out: 1883 kfree_skb(skb); 1884 goto out; 1885 } 1886 1887 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1888 { 1889 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1890 } 1891 1892 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1893 int type, struct mld2_grec **ppgr, unsigned int mtu) 1894 { 1895 struct mld2_report *pmr; 1896 struct mld2_grec *pgr; 1897 1898 if (!skb) { 1899 skb = mld_newpack(pmc->idev, mtu); 1900 if (!skb) 1901 return NULL; 1902 } 1903 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1904 pgr->grec_type = type; 1905 pgr->grec_auxwords = 0; 1906 pgr->grec_nsrcs = 0; 1907 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1908 pmr = (struct mld2_report *)skb_transport_header(skb); 1909 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1910 *ppgr = pgr; 1911 return skb; 1912 } 1913 1914 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1915 1916 /* called with mc_lock */ 1917 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1918 int type, int gdeleted, int sdeleted, 1919 int crsend) 1920 { 1921 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1922 int scount, stotal, first, isquery, truncate; 1923 struct ip6_sf_list __rcu **psf_list; 1924 struct inet6_dev *idev = pmc->idev; 1925 struct net_device *dev = idev->dev; 1926 struct mld2_grec *pgr = NULL; 1927 struct mld2_report *pmr; 1928 unsigned int mtu; 1929 1930 if (pmc->mca_flags & MAF_NOREPORT) 1931 return skb; 1932 1933 mtu = READ_ONCE(dev->mtu); 1934 if (mtu < IPV6_MIN_MTU) 1935 return skb; 1936 1937 isquery = type == MLD2_MODE_IS_INCLUDE || 1938 type == MLD2_MODE_IS_EXCLUDE; 1939 truncate = type == MLD2_MODE_IS_EXCLUDE || 1940 type == MLD2_CHANGE_TO_EXCLUDE; 1941 1942 stotal = scount = 0; 1943 1944 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1945 1946 if (!rcu_access_pointer(*psf_list)) 1947 goto empty_source; 1948 1949 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1950 1951 /* EX and TO_EX get a fresh packet, if needed */ 1952 if (truncate) { 1953 if (pmr && pmr->mld2r_ngrec && 1954 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1955 if (skb) 1956 mld_sendpack(skb); 1957 skb = mld_newpack(idev, mtu); 1958 } 1959 } 1960 first = 1; 1961 psf_prev = NULL; 1962 for (psf = mc_dereference(*psf_list, idev); 1963 psf; 1964 psf = psf_next) { 1965 struct in6_addr *psrc; 1966 1967 psf_next = mc_dereference(psf->sf_next, idev); 1968 1969 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1970 psf_prev = psf; 1971 continue; 1972 } 1973 1974 /* Based on RFC3810 6.1. Should not send source-list change 1975 * records when there is a filter mode change. 1976 */ 1977 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1978 (!gdeleted && pmc->mca_crcount)) && 1979 (type == MLD2_ALLOW_NEW_SOURCES || 1980 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1981 goto decrease_sf_crcount; 1982 1983 /* clear marks on query responses */ 1984 if (isquery) 1985 psf->sf_gsresp = 0; 1986 1987 if (AVAILABLE(skb) < sizeof(*psrc) + 1988 first*sizeof(struct mld2_grec)) { 1989 if (truncate && !first) 1990 break; /* truncate these */ 1991 if (pgr) 1992 pgr->grec_nsrcs = htons(scount); 1993 if (skb) 1994 mld_sendpack(skb); 1995 skb = mld_newpack(idev, mtu); 1996 first = 1; 1997 scount = 0; 1998 } 1999 if (first) { 2000 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2001 first = 0; 2002 } 2003 if (!skb) 2004 return NULL; 2005 psrc = skb_put(skb, sizeof(*psrc)); 2006 *psrc = psf->sf_addr; 2007 scount++; stotal++; 2008 if ((type == MLD2_ALLOW_NEW_SOURCES || 2009 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 2010 decrease_sf_crcount: 2011 psf->sf_crcount--; 2012 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 2013 if (psf_prev) 2014 rcu_assign_pointer(psf_prev->sf_next, 2015 mc_dereference(psf->sf_next, idev)); 2016 else 2017 rcu_assign_pointer(*psf_list, 2018 mc_dereference(psf->sf_next, idev)); 2019 kfree_rcu(psf, rcu); 2020 continue; 2021 } 2022 } 2023 psf_prev = psf; 2024 } 2025 2026 empty_source: 2027 if (!stotal) { 2028 if (type == MLD2_ALLOW_NEW_SOURCES || 2029 type == MLD2_BLOCK_OLD_SOURCES) 2030 return skb; 2031 if (pmc->mca_crcount || isquery || crsend) { 2032 /* make sure we have room for group header */ 2033 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 2034 mld_sendpack(skb); 2035 skb = NULL; /* add_grhead will get a new one */ 2036 } 2037 skb = add_grhead(skb, pmc, type, &pgr, mtu); 2038 } 2039 } 2040 if (pgr) 2041 pgr->grec_nsrcs = htons(scount); 2042 2043 if (isquery) 2044 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 2045 return skb; 2046 } 2047 2048 /* called with mc_lock */ 2049 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2050 { 2051 struct sk_buff *skb = NULL; 2052 int type; 2053 2054 if (!pmc) { 2055 for_each_mc_mclock(idev, pmc) { 2056 if (pmc->mca_flags & MAF_NOREPORT) 2057 continue; 2058 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2059 type = MLD2_MODE_IS_EXCLUDE; 2060 else 2061 type = MLD2_MODE_IS_INCLUDE; 2062 skb = add_grec(skb, pmc, type, 0, 0, 0); 2063 } 2064 } else { 2065 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2066 type = MLD2_MODE_IS_EXCLUDE; 2067 else 2068 type = MLD2_MODE_IS_INCLUDE; 2069 skb = add_grec(skb, pmc, type, 0, 0, 0); 2070 } 2071 if (skb) 2072 mld_sendpack(skb); 2073 } 2074 2075 /* 2076 * remove zero-count source records from a source filter list 2077 * called with mc_lock 2078 */ 2079 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2080 { 2081 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2082 2083 psf_prev = NULL; 2084 for (psf = mc_dereference(*ppsf, idev); 2085 psf; 2086 psf = psf_next) { 2087 psf_next = mc_dereference(psf->sf_next, idev); 2088 if (psf->sf_crcount == 0) { 2089 if (psf_prev) 2090 rcu_assign_pointer(psf_prev->sf_next, 2091 mc_dereference(psf->sf_next, idev)); 2092 else 2093 rcu_assign_pointer(*ppsf, 2094 mc_dereference(psf->sf_next, idev)); 2095 kfree_rcu(psf, rcu); 2096 } else { 2097 psf_prev = psf; 2098 } 2099 } 2100 } 2101 2102 /* called with mc_lock */ 2103 static void mld_send_cr(struct inet6_dev *idev) 2104 { 2105 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2106 struct sk_buff *skb = NULL; 2107 int type, dtype; 2108 2109 /* deleted MCA's */ 2110 pmc_prev = NULL; 2111 for (pmc = mc_dereference(idev->mc_tomb, idev); 2112 pmc; 2113 pmc = pmc_next) { 2114 pmc_next = mc_dereference(pmc->next, idev); 2115 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2116 type = MLD2_BLOCK_OLD_SOURCES; 2117 dtype = MLD2_BLOCK_OLD_SOURCES; 2118 skb = add_grec(skb, pmc, type, 1, 0, 0); 2119 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2120 } 2121 if (pmc->mca_crcount) { 2122 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2123 type = MLD2_CHANGE_TO_INCLUDE; 2124 skb = add_grec(skb, pmc, type, 1, 0, 0); 2125 } 2126 pmc->mca_crcount--; 2127 if (pmc->mca_crcount == 0) { 2128 mld_clear_zeros(&pmc->mca_tomb, idev); 2129 mld_clear_zeros(&pmc->mca_sources, idev); 2130 } 2131 } 2132 if (pmc->mca_crcount == 0 && 2133 !rcu_access_pointer(pmc->mca_tomb) && 2134 !rcu_access_pointer(pmc->mca_sources)) { 2135 if (pmc_prev) 2136 rcu_assign_pointer(pmc_prev->next, pmc_next); 2137 else 2138 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2139 in6_dev_put(pmc->idev); 2140 kfree_rcu(pmc, rcu); 2141 } else 2142 pmc_prev = pmc; 2143 } 2144 2145 /* change recs */ 2146 for_each_mc_mclock(idev, pmc) { 2147 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2148 type = MLD2_BLOCK_OLD_SOURCES; 2149 dtype = MLD2_ALLOW_NEW_SOURCES; 2150 } else { 2151 type = MLD2_ALLOW_NEW_SOURCES; 2152 dtype = MLD2_BLOCK_OLD_SOURCES; 2153 } 2154 skb = add_grec(skb, pmc, type, 0, 0, 0); 2155 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2156 2157 /* filter mode changes */ 2158 if (pmc->mca_crcount) { 2159 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2160 type = MLD2_CHANGE_TO_EXCLUDE; 2161 else 2162 type = MLD2_CHANGE_TO_INCLUDE; 2163 skb = add_grec(skb, pmc, type, 0, 0, 0); 2164 pmc->mca_crcount--; 2165 } 2166 } 2167 if (!skb) 2168 return; 2169 (void) mld_sendpack(skb); 2170 } 2171 2172 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2173 { 2174 const struct in6_addr *snd_addr, *saddr; 2175 int err, len, payload_len, full_len; 2176 struct in6_addr addr_buf; 2177 struct inet6_dev *idev; 2178 struct sk_buff *skb; 2179 struct mld_msg *hdr; 2180 int hlen = LL_RESERVED_SPACE(dev); 2181 int tlen = dev->needed_tailroom; 2182 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2183 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2184 IPV6_TLV_PADN, 0 }; 2185 struct dst_entry *dst; 2186 struct flowi6 fl6; 2187 struct net *net; 2188 struct sock *sk; 2189 2190 if (type == ICMPV6_MGM_REDUCTION) 2191 snd_addr = &in6addr_linklocal_allrouters; 2192 else 2193 snd_addr = addr; 2194 2195 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2196 payload_len = len + sizeof(ra); 2197 full_len = sizeof(struct ipv6hdr) + payload_len; 2198 2199 skb = alloc_skb(hlen + tlen + full_len, GFP_KERNEL); 2200 2201 rcu_read_lock(); 2202 2203 net = dev_net_rcu(dev); 2204 idev = __in6_dev_get(dev); 2205 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 2206 if (!skb) { 2207 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2208 rcu_read_unlock(); 2209 return; 2210 } 2211 sk = net->ipv6.igmp_sk; 2212 skb_set_owner_w(skb, sk); 2213 2214 skb->priority = TC_PRIO_CONTROL; 2215 skb_reserve(skb, hlen); 2216 2217 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2218 /* <draft-ietf-magma-mld-source-05.txt>: 2219 * use unspecified address as the source address 2220 * when a valid link-local address is not available. 2221 */ 2222 saddr = &in6addr_any; 2223 } else 2224 saddr = &addr_buf; 2225 2226 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2227 2228 skb_put_data(skb, ra, sizeof(ra)); 2229 2230 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2231 hdr->mld_type = type; 2232 hdr->mld_mca = *addr; 2233 2234 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2235 IPPROTO_ICMPV6, 2236 csum_partial(hdr, len, 0)); 2237 2238 icmpv6_flow_init(sk, &fl6, type, 2239 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2240 skb->dev->ifindex); 2241 dst = icmp6_dst_alloc(skb->dev, &fl6); 2242 if (IS_ERR(dst)) { 2243 err = PTR_ERR(dst); 2244 goto err_out; 2245 } 2246 2247 skb_dst_set(skb, dst); 2248 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2249 net, sk, skb, NULL, skb->dev, 2250 dst_output); 2251 out: 2252 if (!err) { 2253 ICMP6MSGOUT_INC_STATS(net, idev, type); 2254 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2255 } else 2256 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2257 2258 rcu_read_unlock(); 2259 return; 2260 2261 err_out: 2262 kfree_skb(skb); 2263 goto out; 2264 } 2265 2266 /* called with mc_lock */ 2267 static void mld_send_initial_cr(struct inet6_dev *idev) 2268 { 2269 struct sk_buff *skb; 2270 struct ifmcaddr6 *pmc; 2271 int type; 2272 2273 if (mld_in_v1_mode(idev)) 2274 return; 2275 2276 skb = NULL; 2277 for_each_mc_mclock(idev, pmc) { 2278 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2279 type = MLD2_CHANGE_TO_EXCLUDE; 2280 else 2281 type = MLD2_ALLOW_NEW_SOURCES; 2282 skb = add_grec(skb, pmc, type, 0, 0, 1); 2283 } 2284 if (skb) 2285 mld_sendpack(skb); 2286 } 2287 2288 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2289 { 2290 mutex_lock(&idev->mc_lock); 2291 idev->mc_dad_count = idev->mc_qrv; 2292 if (idev->mc_dad_count) { 2293 mld_send_initial_cr(idev); 2294 idev->mc_dad_count--; 2295 if (idev->mc_dad_count) 2296 mld_dad_start_work(idev, 2297 unsolicited_report_interval(idev)); 2298 } 2299 mutex_unlock(&idev->mc_lock); 2300 } 2301 2302 static void mld_dad_work(struct work_struct *work) 2303 { 2304 struct inet6_dev *idev = container_of(to_delayed_work(work), 2305 struct inet6_dev, 2306 mc_dad_work); 2307 mutex_lock(&idev->mc_lock); 2308 mld_send_initial_cr(idev); 2309 if (idev->mc_dad_count) { 2310 idev->mc_dad_count--; 2311 if (idev->mc_dad_count) 2312 mld_dad_start_work(idev, 2313 unsolicited_report_interval(idev)); 2314 } 2315 mutex_unlock(&idev->mc_lock); 2316 in6_dev_put(idev); 2317 } 2318 2319 /* called with mc_lock */ 2320 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2321 const struct in6_addr *psfsrc) 2322 { 2323 struct ip6_sf_list *psf, *psf_prev; 2324 int rv = 0; 2325 2326 psf_prev = NULL; 2327 for_each_psf_mclock(pmc, psf) { 2328 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2329 break; 2330 psf_prev = psf; 2331 } 2332 if (!psf || psf->sf_count[sfmode] == 0) { 2333 /* source filter not found, or count wrong => bug */ 2334 return -ESRCH; 2335 } 2336 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1); 2337 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2338 struct inet6_dev *idev = pmc->idev; 2339 2340 /* no more filters for this source */ 2341 if (psf_prev) 2342 rcu_assign_pointer(psf_prev->sf_next, 2343 mc_dereference(psf->sf_next, idev)); 2344 else 2345 rcu_assign_pointer(pmc->mca_sources, 2346 mc_dereference(psf->sf_next, idev)); 2347 2348 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2349 !mld_in_v1_mode(idev)) { 2350 psf->sf_crcount = idev->mc_qrv; 2351 rcu_assign_pointer(psf->sf_next, 2352 mc_dereference(pmc->mca_tomb, idev)); 2353 rcu_assign_pointer(pmc->mca_tomb, psf); 2354 rv = 1; 2355 } else { 2356 kfree_rcu(psf, rcu); 2357 } 2358 } 2359 return rv; 2360 } 2361 2362 /* called with mc_lock */ 2363 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2364 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2365 int delta) 2366 { 2367 struct ifmcaddr6 *pmc; 2368 int changerec = 0; 2369 int i, err; 2370 2371 if (!idev) 2372 return -ENODEV; 2373 2374 for_each_mc_mclock(idev, pmc) { 2375 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2376 break; 2377 } 2378 if (!pmc) 2379 return -ESRCH; 2380 2381 sf_markstate(pmc); 2382 if (!delta) { 2383 if (!pmc->mca_sfcount[sfmode]) 2384 return -EINVAL; 2385 2386 pmc->mca_sfcount[sfmode]--; 2387 } 2388 err = 0; 2389 for (i = 0; i < sfcount; i++) { 2390 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2391 2392 changerec |= rv > 0; 2393 if (!err && rv < 0) 2394 err = rv; 2395 } 2396 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2397 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2398 pmc->mca_sfcount[MCAST_INCLUDE]) { 2399 struct ip6_sf_list *psf; 2400 2401 /* filter mode change */ 2402 pmc->mca_sfmode = MCAST_INCLUDE; 2403 pmc->mca_crcount = idev->mc_qrv; 2404 idev->mc_ifc_count = pmc->mca_crcount; 2405 for_each_psf_mclock(pmc, psf) 2406 psf->sf_crcount = 0; 2407 mld_ifc_event(pmc->idev); 2408 } else if (sf_setstate(pmc) || changerec) { 2409 mld_ifc_event(pmc->idev); 2410 } 2411 2412 return err; 2413 } 2414 2415 /* 2416 * Add multicast single-source filter to the interface list 2417 * called with mc_lock 2418 */ 2419 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2420 const struct in6_addr *psfsrc) 2421 { 2422 struct ip6_sf_list *psf, *psf_prev; 2423 2424 psf_prev = NULL; 2425 for_each_psf_mclock(pmc, psf) { 2426 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2427 break; 2428 psf_prev = psf; 2429 } 2430 if (!psf) { 2431 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2432 if (!psf) 2433 return -ENOBUFS; 2434 2435 psf->sf_addr = *psfsrc; 2436 if (psf_prev) { 2437 rcu_assign_pointer(psf_prev->sf_next, psf); 2438 } else { 2439 rcu_assign_pointer(pmc->mca_sources, psf); 2440 } 2441 } 2442 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1); 2443 return 0; 2444 } 2445 2446 /* called with mc_lock */ 2447 static void sf_markstate(struct ifmcaddr6 *pmc) 2448 { 2449 struct ip6_sf_list *psf; 2450 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2451 2452 for_each_psf_mclock(pmc, psf) { 2453 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2454 psf->sf_oldin = mca_xcount == 2455 psf->sf_count[MCAST_EXCLUDE] && 2456 !psf->sf_count[MCAST_INCLUDE]; 2457 } else { 2458 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2459 } 2460 } 2461 } 2462 2463 /* called with mc_lock */ 2464 static int sf_setstate(struct ifmcaddr6 *pmc) 2465 { 2466 struct ip6_sf_list *psf, *dpsf; 2467 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2468 int qrv = pmc->idev->mc_qrv; 2469 int new_in, rv; 2470 2471 rv = 0; 2472 for_each_psf_mclock(pmc, psf) { 2473 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2474 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2475 !psf->sf_count[MCAST_INCLUDE]; 2476 } else 2477 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2478 if (new_in) { 2479 if (!psf->sf_oldin) { 2480 struct ip6_sf_list *prev = NULL; 2481 2482 for_each_psf_tomb(pmc, dpsf) { 2483 if (ipv6_addr_equal(&dpsf->sf_addr, 2484 &psf->sf_addr)) 2485 break; 2486 prev = dpsf; 2487 } 2488 if (dpsf) { 2489 if (prev) 2490 rcu_assign_pointer(prev->sf_next, 2491 mc_dereference(dpsf->sf_next, 2492 pmc->idev)); 2493 else 2494 rcu_assign_pointer(pmc->mca_tomb, 2495 mc_dereference(dpsf->sf_next, 2496 pmc->idev)); 2497 kfree_rcu(dpsf, rcu); 2498 } 2499 psf->sf_crcount = qrv; 2500 rv++; 2501 } 2502 } else if (psf->sf_oldin) { 2503 psf->sf_crcount = 0; 2504 /* 2505 * add or update "delete" records if an active filter 2506 * is now inactive 2507 */ 2508 2509 for_each_psf_tomb(pmc, dpsf) 2510 if (ipv6_addr_equal(&dpsf->sf_addr, 2511 &psf->sf_addr)) 2512 break; 2513 if (!dpsf) { 2514 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2515 if (!dpsf) 2516 continue; 2517 *dpsf = *psf; 2518 rcu_assign_pointer(dpsf->sf_next, 2519 mc_dereference(pmc->mca_tomb, pmc->idev)); 2520 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2521 } 2522 dpsf->sf_crcount = qrv; 2523 rv++; 2524 } 2525 } 2526 return rv; 2527 } 2528 2529 /* 2530 * Add multicast source filter list to the interface list 2531 * called with mc_lock 2532 */ 2533 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2534 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2535 int delta) 2536 { 2537 struct ifmcaddr6 *pmc; 2538 int isexclude; 2539 int i, err; 2540 2541 if (!idev) 2542 return -ENODEV; 2543 2544 for_each_mc_mclock(idev, pmc) { 2545 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2546 break; 2547 } 2548 if (!pmc) 2549 return -ESRCH; 2550 2551 sf_markstate(pmc); 2552 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2553 if (!delta) 2554 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2555 pmc->mca_sfcount[sfmode] + 1); 2556 err = 0; 2557 for (i = 0; i < sfcount; i++) { 2558 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2559 if (err) 2560 break; 2561 } 2562 if (err) { 2563 int j; 2564 2565 if (!delta) 2566 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2567 pmc->mca_sfcount[sfmode] - 1); 2568 for (j = 0; j < i; j++) 2569 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2570 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2571 struct ip6_sf_list *psf; 2572 2573 /* filter mode change */ 2574 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2575 pmc->mca_sfmode = MCAST_EXCLUDE; 2576 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2577 pmc->mca_sfmode = MCAST_INCLUDE; 2578 /* else no filters; keep old mode for reports */ 2579 2580 pmc->mca_crcount = idev->mc_qrv; 2581 idev->mc_ifc_count = pmc->mca_crcount; 2582 for_each_psf_mclock(pmc, psf) 2583 psf->sf_crcount = 0; 2584 mld_ifc_event(idev); 2585 } else if (sf_setstate(pmc)) { 2586 mld_ifc_event(idev); 2587 } 2588 return err; 2589 } 2590 2591 /* called with mc_lock */ 2592 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2593 { 2594 struct ip6_sf_list *psf, *nextpsf; 2595 2596 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2597 psf; 2598 psf = nextpsf) { 2599 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2600 kfree_rcu(psf, rcu); 2601 } 2602 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2603 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2604 psf; 2605 psf = nextpsf) { 2606 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2607 kfree_rcu(psf, rcu); 2608 } 2609 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2610 pmc->mca_sfmode = MCAST_EXCLUDE; 2611 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2612 /* Paired with the READ_ONCE() from ipv6_chk_mcast_addr() */ 2613 WRITE_ONCE(pmc->mca_sfcount[MCAST_EXCLUDE], 1); 2614 } 2615 2616 /* called with mc_lock */ 2617 static void igmp6_join_group(struct ifmcaddr6 *ma) 2618 { 2619 unsigned long delay; 2620 2621 if (ma->mca_flags & MAF_NOREPORT) 2622 return; 2623 2624 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2625 2626 delay = get_random_u32_below(unsolicited_report_interval(ma->idev)); 2627 2628 if (cancel_delayed_work(&ma->mca_work)) { 2629 refcount_dec(&ma->mca_refcnt); 2630 delay = ma->mca_work.timer.expires - jiffies; 2631 } 2632 2633 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2634 refcount_inc(&ma->mca_refcnt); 2635 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2636 } 2637 2638 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2639 struct inet6_dev *idev) 2640 { 2641 struct ip6_sf_socklist *psl; 2642 int err; 2643 2644 psl = sock_dereference(iml->sflist, sk); 2645 2646 if (idev) 2647 mutex_lock(&idev->mc_lock); 2648 2649 if (!psl) { 2650 /* any-source empty exclude case */ 2651 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2652 } else { 2653 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2654 psl->sl_count, psl->sl_addr, 0); 2655 RCU_INIT_POINTER(iml->sflist, NULL); 2656 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2657 &sk->sk_omem_alloc); 2658 kfree_rcu(psl, rcu); 2659 } 2660 2661 if (idev) 2662 mutex_unlock(&idev->mc_lock); 2663 2664 return err; 2665 } 2666 2667 /* called with mc_lock */ 2668 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2669 { 2670 if (mld_in_v1_mode(ma->idev)) { 2671 if (ma->mca_flags & MAF_LAST_REPORTER) { 2672 igmp6_send(&ma->mca_addr, ma->idev->dev, 2673 ICMPV6_MGM_REDUCTION); 2674 } 2675 } else { 2676 mld_add_delrec(ma->idev, ma); 2677 mld_ifc_event(ma->idev); 2678 } 2679 } 2680 2681 static void mld_gq_work(struct work_struct *work) 2682 { 2683 struct inet6_dev *idev = container_of(to_delayed_work(work), 2684 struct inet6_dev, 2685 mc_gq_work); 2686 2687 mutex_lock(&idev->mc_lock); 2688 mld_send_report(idev, NULL); 2689 idev->mc_gq_running = 0; 2690 mutex_unlock(&idev->mc_lock); 2691 2692 in6_dev_put(idev); 2693 } 2694 2695 static void mld_ifc_work(struct work_struct *work) 2696 { 2697 struct inet6_dev *idev = container_of(to_delayed_work(work), 2698 struct inet6_dev, 2699 mc_ifc_work); 2700 2701 mutex_lock(&idev->mc_lock); 2702 mld_send_cr(idev); 2703 2704 if (idev->mc_ifc_count) { 2705 idev->mc_ifc_count--; 2706 if (idev->mc_ifc_count) 2707 mld_ifc_start_work(idev, 2708 unsolicited_report_interval(idev)); 2709 } 2710 mutex_unlock(&idev->mc_lock); 2711 in6_dev_put(idev); 2712 } 2713 2714 /* called with mc_lock */ 2715 static void mld_ifc_event(struct inet6_dev *idev) 2716 { 2717 if (mld_in_v1_mode(idev)) 2718 return; 2719 2720 idev->mc_ifc_count = idev->mc_qrv; 2721 mld_ifc_start_work(idev, 1); 2722 } 2723 2724 static void mld_mca_work(struct work_struct *work) 2725 { 2726 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2727 struct ifmcaddr6, mca_work); 2728 2729 mutex_lock(&ma->idev->mc_lock); 2730 if (mld_in_v1_mode(ma->idev)) 2731 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2732 else 2733 mld_send_report(ma->idev, ma); 2734 ma->mca_flags |= MAF_LAST_REPORTER; 2735 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2736 mutex_unlock(&ma->idev->mc_lock); 2737 2738 ma_put(ma); 2739 } 2740 2741 /* Device changing type */ 2742 2743 void ipv6_mc_unmap(struct inet6_dev *idev) 2744 { 2745 struct ifmcaddr6 *i; 2746 2747 /* Install multicast list, except for all-nodes (already installed) */ 2748 2749 mutex_lock(&idev->mc_lock); 2750 for_each_mc_mclock(idev, i) 2751 igmp6_group_dropped(i); 2752 mutex_unlock(&idev->mc_lock); 2753 } 2754 2755 void ipv6_mc_remap(struct inet6_dev *idev) 2756 { 2757 ipv6_mc_up(idev); 2758 } 2759 2760 /* Device going down */ 2761 void ipv6_mc_down(struct inet6_dev *idev) 2762 { 2763 struct ifmcaddr6 *i; 2764 2765 mutex_lock(&idev->mc_lock); 2766 /* Withdraw multicast list */ 2767 for_each_mc_mclock(idev, i) 2768 igmp6_group_dropped(i); 2769 mutex_unlock(&idev->mc_lock); 2770 2771 /* Should stop work after group drop. or we will 2772 * start work again in mld_ifc_event() 2773 */ 2774 mld_query_stop_work(idev); 2775 mld_report_stop_work(idev); 2776 2777 mutex_lock(&idev->mc_lock); 2778 mld_ifc_stop_work(idev); 2779 mld_gq_stop_work(idev); 2780 mutex_unlock(&idev->mc_lock); 2781 2782 mld_dad_stop_work(idev); 2783 } 2784 2785 static void ipv6_mc_reset(struct inet6_dev *idev) 2786 { 2787 idev->mc_qrv = sysctl_mld_qrv; 2788 idev->mc_qi = MLD_QI_DEFAULT; 2789 idev->mc_qri = MLD_QRI_DEFAULT; 2790 idev->mc_v1_seen = 0; 2791 idev->mc_maxdelay = unsolicited_report_interval(idev); 2792 } 2793 2794 /* Device going up */ 2795 2796 void ipv6_mc_up(struct inet6_dev *idev) 2797 { 2798 struct ifmcaddr6 *i; 2799 2800 /* Install multicast list, except for all-nodes (already installed) */ 2801 2802 ipv6_mc_reset(idev); 2803 mutex_lock(&idev->mc_lock); 2804 for_each_mc_mclock(idev, i) { 2805 mld_del_delrec(idev, i); 2806 igmp6_group_added(i); 2807 } 2808 mutex_unlock(&idev->mc_lock); 2809 } 2810 2811 /* IPv6 device initialization. */ 2812 2813 void ipv6_mc_init_dev(struct inet6_dev *idev) 2814 { 2815 idev->mc_gq_running = 0; 2816 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2817 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2818 idev->mc_ifc_count = 0; 2819 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2820 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2821 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2822 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2823 skb_queue_head_init(&idev->mc_query_queue); 2824 skb_queue_head_init(&idev->mc_report_queue); 2825 spin_lock_init(&idev->mc_query_lock); 2826 spin_lock_init(&idev->mc_report_lock); 2827 mutex_init(&idev->mc_lock); 2828 ipv6_mc_reset(idev); 2829 } 2830 2831 /* 2832 * Device is about to be destroyed: clean up. 2833 */ 2834 2835 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2836 { 2837 struct ifmcaddr6 *i; 2838 2839 /* Deactivate works */ 2840 ipv6_mc_down(idev); 2841 mutex_lock(&idev->mc_lock); 2842 mld_clear_delrec(idev); 2843 mutex_unlock(&idev->mc_lock); 2844 mld_clear_query(idev); 2845 mld_clear_report(idev); 2846 2847 /* Delete all-nodes address. */ 2848 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2849 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2850 * fail. 2851 */ 2852 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2853 2854 if (idev->cnf.forwarding) 2855 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2856 2857 mutex_lock(&idev->mc_lock); 2858 while ((i = mc_dereference(idev->mc_list, idev))) { 2859 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2860 2861 ip6_mc_clear_src(i); 2862 ma_put(i); 2863 } 2864 mutex_unlock(&idev->mc_lock); 2865 } 2866 2867 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2868 { 2869 struct ifmcaddr6 *pmc; 2870 2871 ASSERT_RTNL(); 2872 2873 mutex_lock(&idev->mc_lock); 2874 if (mld_in_v1_mode(idev)) { 2875 for_each_mc_mclock(idev, pmc) 2876 igmp6_join_group(pmc); 2877 } else { 2878 mld_send_report(idev, NULL); 2879 } 2880 mutex_unlock(&idev->mc_lock); 2881 } 2882 2883 static int ipv6_mc_netdev_event(struct notifier_block *this, 2884 unsigned long event, 2885 void *ptr) 2886 { 2887 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2888 struct inet6_dev *idev = __in6_dev_get(dev); 2889 2890 switch (event) { 2891 case NETDEV_RESEND_IGMP: 2892 if (idev) 2893 ipv6_mc_rejoin_groups(idev); 2894 break; 2895 default: 2896 break; 2897 } 2898 2899 return NOTIFY_DONE; 2900 } 2901 2902 static struct notifier_block igmp6_netdev_notifier = { 2903 .notifier_call = ipv6_mc_netdev_event, 2904 }; 2905 2906 #ifdef CONFIG_PROC_FS 2907 struct igmp6_mc_iter_state { 2908 struct seq_net_private p; 2909 struct net_device *dev; 2910 struct inet6_dev *idev; 2911 }; 2912 2913 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2914 2915 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2916 { 2917 struct ifmcaddr6 *im = NULL; 2918 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2919 struct net *net = seq_file_net(seq); 2920 2921 state->idev = NULL; 2922 for_each_netdev_rcu(net, state->dev) { 2923 struct inet6_dev *idev; 2924 idev = __in6_dev_get(state->dev); 2925 if (!idev) 2926 continue; 2927 2928 im = rcu_dereference(idev->mc_list); 2929 if (im) { 2930 state->idev = idev; 2931 break; 2932 } 2933 } 2934 return im; 2935 } 2936 2937 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2938 { 2939 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2940 2941 im = rcu_dereference(im->next); 2942 while (!im) { 2943 state->dev = next_net_device_rcu(state->dev); 2944 if (!state->dev) { 2945 state->idev = NULL; 2946 break; 2947 } 2948 state->idev = __in6_dev_get(state->dev); 2949 if (!state->idev) 2950 continue; 2951 im = rcu_dereference(state->idev->mc_list); 2952 } 2953 return im; 2954 } 2955 2956 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2957 { 2958 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2959 if (im) 2960 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2961 --pos; 2962 return pos ? NULL : im; 2963 } 2964 2965 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2966 __acquires(RCU) 2967 { 2968 rcu_read_lock(); 2969 return igmp6_mc_get_idx(seq, *pos); 2970 } 2971 2972 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2973 { 2974 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2975 2976 ++*pos; 2977 return im; 2978 } 2979 2980 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2981 __releases(RCU) 2982 { 2983 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2984 2985 if (likely(state->idev)) 2986 state->idev = NULL; 2987 state->dev = NULL; 2988 rcu_read_unlock(); 2989 } 2990 2991 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2992 { 2993 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2994 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2995 2996 seq_printf(seq, 2997 "%-4d %-15s %pi6 %5d %08X %ld\n", 2998 state->dev->ifindex, state->dev->name, 2999 &im->mca_addr, 3000 im->mca_users, im->mca_flags, 3001 (im->mca_flags & MAF_TIMER_RUNNING) ? 3002 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 3003 return 0; 3004 } 3005 3006 static const struct seq_operations igmp6_mc_seq_ops = { 3007 .start = igmp6_mc_seq_start, 3008 .next = igmp6_mc_seq_next, 3009 .stop = igmp6_mc_seq_stop, 3010 .show = igmp6_mc_seq_show, 3011 }; 3012 3013 struct igmp6_mcf_iter_state { 3014 struct seq_net_private p; 3015 struct net_device *dev; 3016 struct inet6_dev *idev; 3017 struct ifmcaddr6 *im; 3018 }; 3019 3020 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 3021 3022 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 3023 { 3024 struct ip6_sf_list *psf = NULL; 3025 struct ifmcaddr6 *im = NULL; 3026 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3027 struct net *net = seq_file_net(seq); 3028 3029 state->idev = NULL; 3030 state->im = NULL; 3031 for_each_netdev_rcu(net, state->dev) { 3032 struct inet6_dev *idev; 3033 idev = __in6_dev_get(state->dev); 3034 if (unlikely(idev == NULL)) 3035 continue; 3036 3037 im = rcu_dereference(idev->mc_list); 3038 if (likely(im)) { 3039 psf = rcu_dereference(im->mca_sources); 3040 if (likely(psf)) { 3041 state->im = im; 3042 state->idev = idev; 3043 break; 3044 } 3045 } 3046 } 3047 return psf; 3048 } 3049 3050 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3051 { 3052 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3053 3054 psf = rcu_dereference(psf->sf_next); 3055 while (!psf) { 3056 state->im = rcu_dereference(state->im->next); 3057 while (!state->im) { 3058 state->dev = next_net_device_rcu(state->dev); 3059 if (!state->dev) { 3060 state->idev = NULL; 3061 goto out; 3062 } 3063 state->idev = __in6_dev_get(state->dev); 3064 if (!state->idev) 3065 continue; 3066 state->im = rcu_dereference(state->idev->mc_list); 3067 } 3068 psf = rcu_dereference(state->im->mca_sources); 3069 } 3070 out: 3071 return psf; 3072 } 3073 3074 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3075 { 3076 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3077 if (psf) 3078 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3079 --pos; 3080 return pos ? NULL : psf; 3081 } 3082 3083 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3084 __acquires(RCU) 3085 { 3086 rcu_read_lock(); 3087 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3088 } 3089 3090 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3091 { 3092 struct ip6_sf_list *psf; 3093 if (v == SEQ_START_TOKEN) 3094 psf = igmp6_mcf_get_first(seq); 3095 else 3096 psf = igmp6_mcf_get_next(seq, v); 3097 ++*pos; 3098 return psf; 3099 } 3100 3101 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3102 __releases(RCU) 3103 { 3104 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3105 3106 if (likely(state->im)) 3107 state->im = NULL; 3108 if (likely(state->idev)) 3109 state->idev = NULL; 3110 3111 state->dev = NULL; 3112 rcu_read_unlock(); 3113 } 3114 3115 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3116 { 3117 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3118 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3119 3120 if (v == SEQ_START_TOKEN) { 3121 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3122 } else { 3123 seq_printf(seq, 3124 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3125 state->dev->ifindex, state->dev->name, 3126 &state->im->mca_addr, 3127 &psf->sf_addr, 3128 READ_ONCE(psf->sf_count[MCAST_INCLUDE]), 3129 READ_ONCE(psf->sf_count[MCAST_EXCLUDE])); 3130 } 3131 return 0; 3132 } 3133 3134 static const struct seq_operations igmp6_mcf_seq_ops = { 3135 .start = igmp6_mcf_seq_start, 3136 .next = igmp6_mcf_seq_next, 3137 .stop = igmp6_mcf_seq_stop, 3138 .show = igmp6_mcf_seq_show, 3139 }; 3140 3141 static int __net_init igmp6_proc_init(struct net *net) 3142 { 3143 int err; 3144 3145 err = -ENOMEM; 3146 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3147 sizeof(struct igmp6_mc_iter_state))) 3148 goto out; 3149 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3150 &igmp6_mcf_seq_ops, 3151 sizeof(struct igmp6_mcf_iter_state))) 3152 goto out_proc_net_igmp6; 3153 3154 err = 0; 3155 out: 3156 return err; 3157 3158 out_proc_net_igmp6: 3159 remove_proc_entry("igmp6", net->proc_net); 3160 goto out; 3161 } 3162 3163 static void __net_exit igmp6_proc_exit(struct net *net) 3164 { 3165 remove_proc_entry("mcfilter6", net->proc_net); 3166 remove_proc_entry("igmp6", net->proc_net); 3167 } 3168 #else 3169 static inline int igmp6_proc_init(struct net *net) 3170 { 3171 return 0; 3172 } 3173 static inline void igmp6_proc_exit(struct net *net) 3174 { 3175 } 3176 #endif 3177 3178 static int __net_init igmp6_net_init(struct net *net) 3179 { 3180 int err; 3181 3182 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3183 SOCK_RAW, IPPROTO_ICMPV6, net); 3184 if (err < 0) { 3185 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3186 err); 3187 goto out; 3188 } 3189 3190 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3191 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3192 3193 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3194 SOCK_RAW, IPPROTO_ICMPV6, net); 3195 if (err < 0) { 3196 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3197 err); 3198 goto out_sock_create; 3199 } 3200 3201 err = igmp6_proc_init(net); 3202 if (err) 3203 goto out_sock_create_autojoin; 3204 3205 return 0; 3206 3207 out_sock_create_autojoin: 3208 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3209 out_sock_create: 3210 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3211 out: 3212 return err; 3213 } 3214 3215 static void __net_exit igmp6_net_exit(struct net *net) 3216 { 3217 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3218 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3219 igmp6_proc_exit(net); 3220 } 3221 3222 static struct pernet_operations igmp6_net_ops = { 3223 .init = igmp6_net_init, 3224 .exit = igmp6_net_exit, 3225 }; 3226 3227 int __init igmp6_init(void) 3228 { 3229 int err; 3230 3231 err = register_pernet_subsys(&igmp6_net_ops); 3232 if (err) 3233 return err; 3234 3235 mld_wq = create_workqueue("mld"); 3236 if (!mld_wq) { 3237 unregister_pernet_subsys(&igmp6_net_ops); 3238 return -ENOMEM; 3239 } 3240 3241 return err; 3242 } 3243 3244 int __init igmp6_late_init(void) 3245 { 3246 return register_netdevice_notifier(&igmp6_netdev_notifier); 3247 } 3248 3249 void igmp6_cleanup(void) 3250 { 3251 unregister_pernet_subsys(&igmp6_net_ops); 3252 destroy_workqueue(mld_wq); 3253 } 3254 3255 void igmp6_late_cleanup(void) 3256 { 3257 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3258 } 3259