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_arp.h> 37 #include <linux/route.h> 38 #include <linux/init.h> 39 #include <linux/proc_fs.h> 40 #include <linux/seq_file.h> 41 #include <linux/slab.h> 42 #include <linux/pkt_sched.h> 43 #include <net/mld.h> 44 #include <linux/workqueue.h> 45 46 #include <linux/netfilter.h> 47 #include <linux/netfilter_ipv6.h> 48 49 #include <net/net_namespace.h> 50 #include <net/sock.h> 51 #include <net/snmp.h> 52 53 #include <net/ipv6.h> 54 #include <net/protocol.h> 55 #include <net/if_inet6.h> 56 #include <net/ndisc.h> 57 #include <net/addrconf.h> 58 #include <net/ip6_route.h> 59 #include <net/inet_common.h> 60 61 #include <net/ip6_checksum.h> 62 63 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 64 static int __mld2_query_bugs[] __attribute__((__unused__)) = { 65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4), 66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4), 67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4) 68 }; 69 70 static struct workqueue_struct *mld_wq; 71 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 72 73 static void igmp6_join_group(struct ifmcaddr6 *ma); 74 static void igmp6_leave_group(struct ifmcaddr6 *ma); 75 static void mld_mca_work(struct work_struct *work); 76 77 static void mld_ifc_event(struct inet6_dev *idev); 78 static bool mld_in_v1_mode(const struct inet6_dev *idev); 79 static int sf_setstate(struct ifmcaddr6 *pmc); 80 static void sf_markstate(struct ifmcaddr6 *pmc); 81 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 82 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 83 int sfmode, int sfcount, const struct in6_addr *psfsrc, 84 int delta); 85 static int ip6_mc_add_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_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 89 struct inet6_dev *idev); 90 static int __ipv6_dev_mc_inc(struct net_device *dev, 91 const struct in6_addr *addr, unsigned int mode); 92 93 #define MLD_QRV_DEFAULT 2 94 /* RFC3810, 9.2. Query Interval */ 95 #define MLD_QI_DEFAULT (125 * HZ) 96 /* RFC3810, 9.3. Query Response Interval */ 97 #define MLD_QRI_DEFAULT (10 * HZ) 98 99 /* RFC3810, 8.1 Query Version Distinctions */ 100 #define MLD_V1_QUERY_LEN 24 101 #define MLD_V2_QUERY_LEN_MIN 28 102 103 #define IPV6_MLD_MAX_MSF 64 104 105 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 106 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; 107 108 /* 109 * socket join on multicast group 110 */ 111 #define mc_dereference(e, idev) \ 112 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock)) 113 114 #define sock_dereference(e, sk) \ 115 rcu_dereference_protected(e, lockdep_sock_is_held(sk)) 116 117 #define for_each_pmc_socklock(np, sk, pmc) \ 118 for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \ 119 pmc; \ 120 pmc = sock_dereference(pmc->next, sk)) 121 122 #define for_each_pmc_rcu(np, pmc) \ 123 for (pmc = rcu_dereference((np)->ipv6_mc_list); \ 124 pmc; \ 125 pmc = rcu_dereference(pmc->next)) 126 127 #define for_each_psf_mclock(mc, psf) \ 128 for (psf = mc_dereference((mc)->mca_sources, mc->idev); \ 129 psf; \ 130 psf = mc_dereference(psf->sf_next, mc->idev)) 131 132 #define for_each_psf_rcu(mc, psf) \ 133 for (psf = rcu_dereference((mc)->mca_sources); \ 134 psf; \ 135 psf = rcu_dereference(psf->sf_next)) 136 137 #define for_each_psf_tomb(mc, psf) \ 138 for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \ 139 psf; \ 140 psf = mc_dereference(psf->sf_next, mc->idev)) 141 142 #define for_each_mc_mclock(idev, mc) \ 143 for (mc = mc_dereference((idev)->mc_list, idev); \ 144 mc; \ 145 mc = mc_dereference(mc->next, idev)) 146 147 #define for_each_mc_rcu(idev, mc) \ 148 for (mc = rcu_dereference((idev)->mc_list); \ 149 mc; \ 150 mc = rcu_dereference(mc->next)) 151 152 #define for_each_mc_tomb(idev, mc) \ 153 for (mc = mc_dereference((idev)->mc_tomb, idev); \ 154 mc; \ 155 mc = mc_dereference(mc->next, idev)) 156 157 static int unsolicited_report_interval(struct inet6_dev *idev) 158 { 159 int iv; 160 161 if (mld_in_v1_mode(idev)) 162 iv = READ_ONCE(idev->cnf.mldv1_unsolicited_report_interval); 163 else 164 iv = READ_ONCE(idev->cnf.mldv2_unsolicited_report_interval); 165 166 return iv > 0 ? iv : 1; 167 } 168 169 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, 170 const struct in6_addr *addr, unsigned int mode) 171 { 172 struct net_device *dev = NULL; 173 struct ipv6_mc_socklist *mc_lst; 174 struct ipv6_pinfo *np = inet6_sk(sk); 175 struct net *net = sock_net(sk); 176 int err; 177 178 ASSERT_RTNL(); 179 180 if (!ipv6_addr_is_multicast(addr)) 181 return -EINVAL; 182 183 for_each_pmc_socklock(np, sk, mc_lst) { 184 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 185 ipv6_addr_equal(&mc_lst->addr, addr)) 186 return -EADDRINUSE; 187 } 188 189 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 190 191 if (!mc_lst) 192 return -ENOMEM; 193 194 mc_lst->next = NULL; 195 mc_lst->addr = *addr; 196 197 if (ifindex == 0) { 198 struct rt6_info *rt; 199 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); 200 if (rt) { 201 dev = rt->dst.dev; 202 ip6_rt_put(rt); 203 } 204 } else 205 dev = __dev_get_by_index(net, ifindex); 206 207 if (!dev) { 208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 209 return -ENODEV; 210 } 211 212 mc_lst->ifindex = dev->ifindex; 213 mc_lst->sfmode = mode; 214 RCU_INIT_POINTER(mc_lst->sflist, NULL); 215 216 /* 217 * now add/increase the group membership on the device 218 */ 219 220 err = __ipv6_dev_mc_inc(dev, addr, mode); 221 222 if (err) { 223 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 224 return err; 225 } 226 227 mc_lst->next = np->ipv6_mc_list; 228 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 229 230 return 0; 231 } 232 233 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 234 { 235 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 236 } 237 EXPORT_SYMBOL(ipv6_sock_mc_join); 238 239 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 240 const struct in6_addr *addr, unsigned int mode) 241 { 242 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 243 } 244 245 /* 246 * socket leave on multicast group 247 */ 248 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 249 { 250 struct ipv6_pinfo *np = inet6_sk(sk); 251 struct ipv6_mc_socklist *mc_lst; 252 struct ipv6_mc_socklist __rcu **lnk; 253 struct net *net = sock_net(sk); 254 255 ASSERT_RTNL(); 256 257 if (!ipv6_addr_is_multicast(addr)) 258 return -EINVAL; 259 260 for (lnk = &np->ipv6_mc_list; 261 (mc_lst = sock_dereference(*lnk, sk)) != NULL; 262 lnk = &mc_lst->next) { 263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 264 ipv6_addr_equal(&mc_lst->addr, addr)) { 265 struct net_device *dev; 266 267 *lnk = mc_lst->next; 268 269 dev = __dev_get_by_index(net, mc_lst->ifindex); 270 if (dev) { 271 struct inet6_dev *idev = __in6_dev_get(dev); 272 273 ip6_mc_leave_src(sk, mc_lst, idev); 274 if (idev) 275 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 276 } else { 277 ip6_mc_leave_src(sk, mc_lst, NULL); 278 } 279 280 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 281 kfree_rcu(mc_lst, rcu); 282 return 0; 283 } 284 } 285 286 return -EADDRNOTAVAIL; 287 } 288 EXPORT_SYMBOL(ipv6_sock_mc_drop); 289 290 static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net, 291 const struct in6_addr *group, 292 int ifindex) 293 { 294 struct net_device *dev = NULL; 295 struct inet6_dev *idev = NULL; 296 297 if (ifindex == 0) { 298 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0); 299 300 if (rt) { 301 dev = rt->dst.dev; 302 ip6_rt_put(rt); 303 } 304 } else { 305 dev = __dev_get_by_index(net, ifindex); 306 } 307 308 if (!dev) 309 return NULL; 310 idev = __in6_dev_get(dev); 311 if (!idev) 312 return NULL; 313 if (idev->dead) 314 return NULL; 315 return idev; 316 } 317 318 void __ipv6_sock_mc_close(struct sock *sk) 319 { 320 struct ipv6_pinfo *np = inet6_sk(sk); 321 struct ipv6_mc_socklist *mc_lst; 322 struct net *net = sock_net(sk); 323 324 ASSERT_RTNL(); 325 326 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) { 327 struct net_device *dev; 328 329 np->ipv6_mc_list = mc_lst->next; 330 331 dev = __dev_get_by_index(net, mc_lst->ifindex); 332 if (dev) { 333 struct inet6_dev *idev = __in6_dev_get(dev); 334 335 ip6_mc_leave_src(sk, mc_lst, idev); 336 if (idev) 337 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 338 } else { 339 ip6_mc_leave_src(sk, mc_lst, NULL); 340 } 341 342 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 343 kfree_rcu(mc_lst, rcu); 344 } 345 } 346 347 void ipv6_sock_mc_close(struct sock *sk) 348 { 349 struct ipv6_pinfo *np = inet6_sk(sk); 350 351 if (!rcu_access_pointer(np->ipv6_mc_list)) 352 return; 353 354 rtnl_lock(); 355 lock_sock(sk); 356 __ipv6_sock_mc_close(sk); 357 release_sock(sk); 358 rtnl_unlock(); 359 } 360 361 int ip6_mc_source(int add, int omode, struct sock *sk, 362 struct group_source_req *pgsr) 363 { 364 struct in6_addr *source, *group; 365 struct ipv6_mc_socklist *pmc; 366 struct inet6_dev *idev; 367 struct ipv6_pinfo *inet6 = inet6_sk(sk); 368 struct ip6_sf_socklist *psl; 369 struct net *net = sock_net(sk); 370 int i, j, rv; 371 int leavegroup = 0; 372 int err; 373 374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 376 377 if (!ipv6_addr_is_multicast(group)) 378 return -EINVAL; 379 380 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface); 381 if (!idev) 382 return -ENODEV; 383 384 err = -EADDRNOTAVAIL; 385 386 mutex_lock(&idev->mc_lock); 387 for_each_pmc_socklock(inet6, sk, pmc) { 388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 389 continue; 390 if (ipv6_addr_equal(&pmc->addr, group)) 391 break; 392 } 393 if (!pmc) { /* must have a prior join */ 394 err = -EINVAL; 395 goto done; 396 } 397 /* if a source filter was set, must be the same mode as before */ 398 if (rcu_access_pointer(pmc->sflist)) { 399 if (pmc->sfmode != omode) { 400 err = -EINVAL; 401 goto done; 402 } 403 } else if (pmc->sfmode != omode) { 404 /* allow mode switches for empty-set filters */ 405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 407 pmc->sfmode = omode; 408 } 409 410 psl = sock_dereference(pmc->sflist, sk); 411 if (!add) { 412 if (!psl) 413 goto done; /* err = -EADDRNOTAVAIL */ 414 rv = !0; 415 for (i = 0; i < psl->sl_count; i++) { 416 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 417 if (rv == 0) 418 break; 419 } 420 if (rv) /* source not found */ 421 goto done; /* err = -EADDRNOTAVAIL */ 422 423 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 424 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 425 leavegroup = 1; 426 goto done; 427 } 428 429 /* update the interface filter */ 430 ip6_mc_del_src(idev, group, omode, 1, source, 1); 431 432 for (j = i+1; j < psl->sl_count; j++) 433 psl->sl_addr[j-1] = psl->sl_addr[j]; 434 psl->sl_count--; 435 err = 0; 436 goto done; 437 } 438 /* else, add a new source to the filter */ 439 440 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 441 err = -ENOBUFS; 442 goto done; 443 } 444 if (!psl || psl->sl_count == psl->sl_max) { 445 struct ip6_sf_socklist *newpsl; 446 int count = IP6_SFBLOCK; 447 448 if (psl) 449 count += psl->sl_max; 450 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), 451 GFP_KERNEL); 452 if (!newpsl) { 453 err = -ENOBUFS; 454 goto done; 455 } 456 newpsl->sl_max = count; 457 newpsl->sl_count = count - IP6_SFBLOCK; 458 if (psl) { 459 for (i = 0; i < psl->sl_count; i++) 460 newpsl->sl_addr[i] = psl->sl_addr[i]; 461 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 462 &sk->sk_omem_alloc); 463 } 464 rcu_assign_pointer(pmc->sflist, newpsl); 465 kfree_rcu(psl, rcu); 466 psl = newpsl; 467 } 468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 469 for (i = 0; i < psl->sl_count; i++) { 470 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 471 if (rv == 0) /* There is an error in the address. */ 472 goto done; 473 } 474 for (j = psl->sl_count-1; j >= i; j--) 475 psl->sl_addr[j+1] = psl->sl_addr[j]; 476 psl->sl_addr[i] = *source; 477 psl->sl_count++; 478 err = 0; 479 /* update the interface list */ 480 ip6_mc_add_src(idev, group, omode, 1, source, 1); 481 done: 482 mutex_unlock(&idev->mc_lock); 483 if (leavegroup) 484 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 485 return err; 486 } 487 488 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 489 struct sockaddr_storage *list) 490 { 491 const struct in6_addr *group; 492 struct ipv6_mc_socklist *pmc; 493 struct inet6_dev *idev; 494 struct ipv6_pinfo *inet6 = inet6_sk(sk); 495 struct ip6_sf_socklist *newpsl, *psl; 496 struct net *net = sock_net(sk); 497 int leavegroup = 0; 498 int i, err; 499 500 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 501 502 if (!ipv6_addr_is_multicast(group)) 503 return -EINVAL; 504 if (gsf->gf_fmode != MCAST_INCLUDE && 505 gsf->gf_fmode != MCAST_EXCLUDE) 506 return -EINVAL; 507 508 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface); 509 if (!idev) 510 return -ENODEV; 511 512 err = 0; 513 514 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 515 leavegroup = 1; 516 goto done; 517 } 518 519 for_each_pmc_socklock(inet6, sk, pmc) { 520 if (pmc->ifindex != gsf->gf_interface) 521 continue; 522 if (ipv6_addr_equal(&pmc->addr, group)) 523 break; 524 } 525 if (!pmc) { /* must have a prior join */ 526 err = -EINVAL; 527 goto done; 528 } 529 if (gsf->gf_numsrc) { 530 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, 531 gsf->gf_numsrc), 532 GFP_KERNEL); 533 if (!newpsl) { 534 err = -ENOBUFS; 535 goto done; 536 } 537 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 538 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 539 struct sockaddr_in6 *psin6; 540 541 psin6 = (struct sockaddr_in6 *)list; 542 newpsl->sl_addr[i] = psin6->sin6_addr; 543 } 544 mutex_lock(&idev->mc_lock); 545 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 546 newpsl->sl_count, newpsl->sl_addr, 0); 547 if (err) { 548 mutex_unlock(&idev->mc_lock); 549 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr, 550 newpsl->sl_max)); 551 goto done; 552 } 553 mutex_unlock(&idev->mc_lock); 554 } else { 555 newpsl = NULL; 556 mutex_lock(&idev->mc_lock); 557 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 558 mutex_unlock(&idev->mc_lock); 559 } 560 561 mutex_lock(&idev->mc_lock); 562 psl = sock_dereference(pmc->sflist, sk); 563 if (psl) { 564 ip6_mc_del_src(idev, group, pmc->sfmode, 565 psl->sl_count, psl->sl_addr, 0); 566 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 567 &sk->sk_omem_alloc); 568 } else { 569 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 570 } 571 rcu_assign_pointer(pmc->sflist, newpsl); 572 mutex_unlock(&idev->mc_lock); 573 kfree_rcu(psl, rcu); 574 pmc->sfmode = gsf->gf_fmode; 575 err = 0; 576 done: 577 if (leavegroup) 578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 579 return err; 580 } 581 582 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 583 sockptr_t optval, size_t ss_offset) 584 { 585 struct ipv6_pinfo *inet6 = inet6_sk(sk); 586 const struct in6_addr *group; 587 struct ipv6_mc_socklist *pmc; 588 struct ip6_sf_socklist *psl; 589 unsigned int count; 590 int i, copycount; 591 592 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 593 594 if (!ipv6_addr_is_multicast(group)) 595 return -EINVAL; 596 597 /* changes to the ipv6_mc_list require the socket lock and 598 * rtnl lock. We have the socket lock, so reading the list is safe. 599 */ 600 601 for_each_pmc_socklock(inet6, sk, pmc) { 602 if (pmc->ifindex != gsf->gf_interface) 603 continue; 604 if (ipv6_addr_equal(group, &pmc->addr)) 605 break; 606 } 607 if (!pmc) /* must have a prior join */ 608 return -EADDRNOTAVAIL; 609 610 gsf->gf_fmode = pmc->sfmode; 611 psl = sock_dereference(pmc->sflist, sk); 612 count = psl ? psl->sl_count : 0; 613 614 copycount = min(count, gsf->gf_numsrc); 615 gsf->gf_numsrc = count; 616 for (i = 0; i < copycount; i++) { 617 struct sockaddr_in6 *psin6; 618 struct sockaddr_storage ss; 619 620 psin6 = (struct sockaddr_in6 *)&ss; 621 memset(&ss, 0, sizeof(ss)); 622 psin6->sin6_family = AF_INET6; 623 psin6->sin6_addr = psl->sl_addr[i]; 624 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss))) 625 return -EFAULT; 626 ss_offset += sizeof(ss); 627 } 628 return 0; 629 } 630 631 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, 632 const struct in6_addr *src_addr) 633 { 634 const struct ipv6_pinfo *np = inet6_sk(sk); 635 const struct ipv6_mc_socklist *mc; 636 const struct ip6_sf_socklist *psl; 637 bool rv = true; 638 639 rcu_read_lock(); 640 for_each_pmc_rcu(np, mc) { 641 if (ipv6_addr_equal(&mc->addr, mc_addr)) 642 break; 643 } 644 if (!mc) { 645 rcu_read_unlock(); 646 return inet6_test_bit(MC6_ALL, sk); 647 } 648 psl = rcu_dereference(mc->sflist); 649 if (!psl) { 650 rv = mc->sfmode == MCAST_EXCLUDE; 651 } else { 652 int i; 653 654 for (i = 0; i < psl->sl_count; i++) { 655 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 656 break; 657 } 658 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 659 rv = false; 660 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 661 rv = false; 662 } 663 rcu_read_unlock(); 664 665 return rv; 666 } 667 668 /* called with mc_lock */ 669 static void igmp6_group_added(struct ifmcaddr6 *mc) 670 { 671 struct net_device *dev = mc->idev->dev; 672 char buf[MAX_ADDR_LEN]; 673 674 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 675 IPV6_ADDR_SCOPE_LINKLOCAL) 676 return; 677 678 if (!(mc->mca_flags&MAF_LOADED)) { 679 mc->mca_flags |= MAF_LOADED; 680 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 681 dev_mc_add(dev, buf); 682 } 683 684 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 685 return; 686 687 if (mld_in_v1_mode(mc->idev)) { 688 igmp6_join_group(mc); 689 return; 690 } 691 /* else v2 */ 692 693 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 694 * should not send filter-mode change record as the mode 695 * should be from IN() to IN(A). 696 */ 697 if (mc->mca_sfmode == MCAST_EXCLUDE) 698 mc->mca_crcount = mc->idev->mc_qrv; 699 700 mld_ifc_event(mc->idev); 701 } 702 703 /* called with mc_lock */ 704 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 705 { 706 struct net_device *dev = mc->idev->dev; 707 char buf[MAX_ADDR_LEN]; 708 709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 710 IPV6_ADDR_SCOPE_LINKLOCAL) 711 return; 712 713 if (mc->mca_flags&MAF_LOADED) { 714 mc->mca_flags &= ~MAF_LOADED; 715 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 716 dev_mc_del(dev, buf); 717 } 718 719 if (mc->mca_flags & MAF_NOREPORT) 720 return; 721 722 if (!mc->idev->dead) 723 igmp6_leave_group(mc); 724 725 if (cancel_delayed_work(&mc->mca_work)) 726 refcount_dec(&mc->mca_refcnt); 727 } 728 729 /* 730 * deleted ifmcaddr6 manipulation 731 * called with mc_lock 732 */ 733 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 734 { 735 struct ifmcaddr6 *pmc; 736 737 /* this is an "ifmcaddr6" for convenience; only the fields below 738 * are actually used. In particular, the refcnt and users are not 739 * used for management of the delete list. Using the same structure 740 * for deleted items allows change reports to use common code with 741 * non-deleted or query-response MCA's. 742 */ 743 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 744 if (!pmc) 745 return; 746 747 pmc->idev = im->idev; 748 in6_dev_hold(idev); 749 pmc->mca_addr = im->mca_addr; 750 pmc->mca_crcount = idev->mc_qrv; 751 pmc->mca_sfmode = im->mca_sfmode; 752 if (pmc->mca_sfmode == MCAST_INCLUDE) { 753 struct ip6_sf_list *psf; 754 755 rcu_assign_pointer(pmc->mca_tomb, 756 mc_dereference(im->mca_tomb, idev)); 757 rcu_assign_pointer(pmc->mca_sources, 758 mc_dereference(im->mca_sources, idev)); 759 RCU_INIT_POINTER(im->mca_tomb, NULL); 760 RCU_INIT_POINTER(im->mca_sources, NULL); 761 762 for_each_psf_mclock(pmc, psf) 763 psf->sf_crcount = pmc->mca_crcount; 764 } 765 766 rcu_assign_pointer(pmc->next, idev->mc_tomb); 767 rcu_assign_pointer(idev->mc_tomb, pmc); 768 } 769 770 /* called with mc_lock */ 771 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 772 { 773 struct ip6_sf_list *psf, *sources, *tomb; 774 struct in6_addr *pmca = &im->mca_addr; 775 struct ifmcaddr6 *pmc, *pmc_prev; 776 777 pmc_prev = NULL; 778 for_each_mc_tomb(idev, pmc) { 779 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 780 break; 781 pmc_prev = pmc; 782 } 783 if (pmc) { 784 if (pmc_prev) 785 rcu_assign_pointer(pmc_prev->next, pmc->next); 786 else 787 rcu_assign_pointer(idev->mc_tomb, pmc->next); 788 } 789 790 if (pmc) { 791 im->idev = pmc->idev; 792 if (im->mca_sfmode == MCAST_INCLUDE) { 793 tomb = rcu_replace_pointer(im->mca_tomb, 794 mc_dereference(pmc->mca_tomb, pmc->idev), 795 lockdep_is_held(&im->idev->mc_lock)); 796 rcu_assign_pointer(pmc->mca_tomb, tomb); 797 798 sources = rcu_replace_pointer(im->mca_sources, 799 mc_dereference(pmc->mca_sources, pmc->idev), 800 lockdep_is_held(&im->idev->mc_lock)); 801 rcu_assign_pointer(pmc->mca_sources, sources); 802 for_each_psf_mclock(im, psf) 803 psf->sf_crcount = idev->mc_qrv; 804 } else { 805 im->mca_crcount = idev->mc_qrv; 806 } 807 in6_dev_put(pmc->idev); 808 ip6_mc_clear_src(pmc); 809 kfree_rcu(pmc, rcu); 810 } 811 } 812 813 /* called with mc_lock */ 814 static void mld_clear_delrec(struct inet6_dev *idev) 815 { 816 struct ifmcaddr6 *pmc, *nextpmc; 817 818 pmc = mc_dereference(idev->mc_tomb, idev); 819 RCU_INIT_POINTER(idev->mc_tomb, NULL); 820 821 for (; pmc; pmc = nextpmc) { 822 nextpmc = mc_dereference(pmc->next, idev); 823 ip6_mc_clear_src(pmc); 824 in6_dev_put(pmc->idev); 825 kfree_rcu(pmc, rcu); 826 } 827 828 /* clear dead sources, too */ 829 for_each_mc_mclock(idev, pmc) { 830 struct ip6_sf_list *psf, *psf_next; 831 832 psf = mc_dereference(pmc->mca_tomb, idev); 833 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 834 for (; psf; psf = psf_next) { 835 psf_next = mc_dereference(psf->sf_next, idev); 836 kfree_rcu(psf, rcu); 837 } 838 } 839 } 840 841 static void mld_clear_query(struct inet6_dev *idev) 842 { 843 struct sk_buff *skb; 844 845 spin_lock_bh(&idev->mc_query_lock); 846 while ((skb = __skb_dequeue(&idev->mc_query_queue))) 847 kfree_skb(skb); 848 spin_unlock_bh(&idev->mc_query_lock); 849 } 850 851 static void mld_clear_report(struct inet6_dev *idev) 852 { 853 struct sk_buff *skb; 854 855 spin_lock_bh(&idev->mc_report_lock); 856 while ((skb = __skb_dequeue(&idev->mc_report_queue))) 857 kfree_skb(skb); 858 spin_unlock_bh(&idev->mc_report_lock); 859 } 860 861 static void mca_get(struct ifmcaddr6 *mc) 862 { 863 refcount_inc(&mc->mca_refcnt); 864 } 865 866 static void ma_put(struct ifmcaddr6 *mc) 867 { 868 if (refcount_dec_and_test(&mc->mca_refcnt)) { 869 in6_dev_put(mc->idev); 870 kfree_rcu(mc, rcu); 871 } 872 } 873 874 /* called with mc_lock */ 875 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 876 const struct in6_addr *addr, 877 unsigned int mode) 878 { 879 struct ifmcaddr6 *mc; 880 881 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 882 if (!mc) 883 return NULL; 884 885 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 886 887 mc->mca_addr = *addr; 888 mc->idev = idev; /* reference taken by caller */ 889 mc->mca_users = 1; 890 /* mca_stamp should be updated upon changes */ 891 mc->mca_cstamp = mc->mca_tstamp = jiffies; 892 refcount_set(&mc->mca_refcnt, 1); 893 894 mc->mca_sfmode = mode; 895 mc->mca_sfcount[mode] = 1; 896 897 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 898 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 899 mc->mca_flags |= MAF_NOREPORT; 900 901 return mc; 902 } 903 904 /* 905 * device multicast group inc (add if not found) 906 */ 907 static int __ipv6_dev_mc_inc(struct net_device *dev, 908 const struct in6_addr *addr, unsigned int mode) 909 { 910 struct ifmcaddr6 *mc; 911 struct inet6_dev *idev; 912 913 ASSERT_RTNL(); 914 915 /* we need to take a reference on idev */ 916 idev = in6_dev_get(dev); 917 918 if (!idev) 919 return -EINVAL; 920 921 if (idev->dead) { 922 in6_dev_put(idev); 923 return -ENODEV; 924 } 925 926 mutex_lock(&idev->mc_lock); 927 for_each_mc_mclock(idev, mc) { 928 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 929 mc->mca_users++; 930 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 931 mutex_unlock(&idev->mc_lock); 932 in6_dev_put(idev); 933 return 0; 934 } 935 } 936 937 mc = mca_alloc(idev, addr, mode); 938 if (!mc) { 939 mutex_unlock(&idev->mc_lock); 940 in6_dev_put(idev); 941 return -ENOMEM; 942 } 943 944 rcu_assign_pointer(mc->next, idev->mc_list); 945 rcu_assign_pointer(idev->mc_list, mc); 946 947 mca_get(mc); 948 949 mld_del_delrec(idev, mc); 950 igmp6_group_added(mc); 951 mutex_unlock(&idev->mc_lock); 952 ma_put(mc); 953 return 0; 954 } 955 956 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 957 { 958 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 959 } 960 EXPORT_SYMBOL(ipv6_dev_mc_inc); 961 962 /* 963 * device multicast group del 964 */ 965 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 966 { 967 struct ifmcaddr6 *ma, __rcu **map; 968 969 ASSERT_RTNL(); 970 971 mutex_lock(&idev->mc_lock); 972 for (map = &idev->mc_list; 973 (ma = mc_dereference(*map, idev)); 974 map = &ma->next) { 975 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 976 if (--ma->mca_users == 0) { 977 *map = ma->next; 978 979 igmp6_group_dropped(ma); 980 ip6_mc_clear_src(ma); 981 mutex_unlock(&idev->mc_lock); 982 983 ma_put(ma); 984 return 0; 985 } 986 mutex_unlock(&idev->mc_lock); 987 return 0; 988 } 989 } 990 991 mutex_unlock(&idev->mc_lock); 992 return -ENOENT; 993 } 994 995 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 996 { 997 struct inet6_dev *idev; 998 int err; 999 1000 ASSERT_RTNL(); 1001 1002 idev = __in6_dev_get(dev); 1003 if (!idev) 1004 err = -ENODEV; 1005 else 1006 err = __ipv6_dev_mc_dec(idev, addr); 1007 1008 return err; 1009 } 1010 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1011 1012 /* 1013 * check if the interface/address pair is valid 1014 */ 1015 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1016 const struct in6_addr *src_addr) 1017 { 1018 struct inet6_dev *idev; 1019 struct ifmcaddr6 *mc; 1020 bool rv = false; 1021 1022 rcu_read_lock(); 1023 idev = __in6_dev_get(dev); 1024 if (idev) { 1025 for_each_mc_rcu(idev, mc) { 1026 if (ipv6_addr_equal(&mc->mca_addr, group)) 1027 break; 1028 } 1029 if (mc) { 1030 if (src_addr && !ipv6_addr_any(src_addr)) { 1031 struct ip6_sf_list *psf; 1032 1033 for_each_psf_rcu(mc, psf) { 1034 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1035 break; 1036 } 1037 if (psf) 1038 rv = psf->sf_count[MCAST_INCLUDE] || 1039 psf->sf_count[MCAST_EXCLUDE] != 1040 mc->mca_sfcount[MCAST_EXCLUDE]; 1041 else 1042 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; 1043 } else 1044 rv = true; /* don't filter unspecified source */ 1045 } 1046 } 1047 rcu_read_unlock(); 1048 return rv; 1049 } 1050 1051 /* called with mc_lock */ 1052 static void mld_gq_start_work(struct inet6_dev *idev) 1053 { 1054 unsigned long tv = get_random_u32_below(idev->mc_maxdelay); 1055 1056 idev->mc_gq_running = 1; 1057 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1058 in6_dev_hold(idev); 1059 } 1060 1061 /* called with mc_lock */ 1062 static void mld_gq_stop_work(struct inet6_dev *idev) 1063 { 1064 idev->mc_gq_running = 0; 1065 if (cancel_delayed_work(&idev->mc_gq_work)) 1066 __in6_dev_put(idev); 1067 } 1068 1069 /* called with mc_lock */ 1070 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1071 { 1072 unsigned long tv = get_random_u32_below(delay); 1073 1074 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1075 in6_dev_hold(idev); 1076 } 1077 1078 /* called with mc_lock */ 1079 static void mld_ifc_stop_work(struct inet6_dev *idev) 1080 { 1081 idev->mc_ifc_count = 0; 1082 if (cancel_delayed_work(&idev->mc_ifc_work)) 1083 __in6_dev_put(idev); 1084 } 1085 1086 /* called with mc_lock */ 1087 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1088 { 1089 unsigned long tv = get_random_u32_below(delay); 1090 1091 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1092 in6_dev_hold(idev); 1093 } 1094 1095 static void mld_dad_stop_work(struct inet6_dev *idev) 1096 { 1097 if (cancel_delayed_work(&idev->mc_dad_work)) 1098 __in6_dev_put(idev); 1099 } 1100 1101 static void mld_query_stop_work(struct inet6_dev *idev) 1102 { 1103 spin_lock_bh(&idev->mc_query_lock); 1104 if (cancel_delayed_work(&idev->mc_query_work)) 1105 __in6_dev_put(idev); 1106 spin_unlock_bh(&idev->mc_query_lock); 1107 } 1108 1109 static void mld_report_stop_work(struct inet6_dev *idev) 1110 { 1111 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1112 __in6_dev_put(idev); 1113 } 1114 1115 /* 1116 * IGMP handling (alias multicast ICMPv6 messages) 1117 * called with mc_lock 1118 */ 1119 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1120 { 1121 unsigned long delay = resptime; 1122 1123 /* Do not start work for these addresses */ 1124 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1125 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1126 return; 1127 1128 if (cancel_delayed_work(&ma->mca_work)) { 1129 refcount_dec(&ma->mca_refcnt); 1130 delay = ma->mca_work.timer.expires - jiffies; 1131 } 1132 1133 if (delay >= resptime) 1134 delay = get_random_u32_below(resptime); 1135 1136 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1137 refcount_inc(&ma->mca_refcnt); 1138 ma->mca_flags |= MAF_TIMER_RUNNING; 1139 } 1140 1141 /* mark EXCLUDE-mode sources 1142 * called with mc_lock 1143 */ 1144 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1145 const struct in6_addr *srcs) 1146 { 1147 struct ip6_sf_list *psf; 1148 int i, scount; 1149 1150 scount = 0; 1151 for_each_psf_mclock(pmc, psf) { 1152 if (scount == nsrcs) 1153 break; 1154 for (i = 0; i < nsrcs; i++) { 1155 /* skip inactive filters */ 1156 if (psf->sf_count[MCAST_INCLUDE] || 1157 pmc->mca_sfcount[MCAST_EXCLUDE] != 1158 psf->sf_count[MCAST_EXCLUDE]) 1159 break; 1160 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1161 scount++; 1162 break; 1163 } 1164 } 1165 } 1166 pmc->mca_flags &= ~MAF_GSQUERY; 1167 if (scount == nsrcs) /* all sources excluded */ 1168 return false; 1169 return true; 1170 } 1171 1172 /* called with mc_lock */ 1173 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1174 const struct in6_addr *srcs) 1175 { 1176 struct ip6_sf_list *psf; 1177 int i, scount; 1178 1179 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1180 return mld_xmarksources(pmc, nsrcs, srcs); 1181 1182 /* mark INCLUDE-mode sources */ 1183 1184 scount = 0; 1185 for_each_psf_mclock(pmc, psf) { 1186 if (scount == nsrcs) 1187 break; 1188 for (i = 0; i < nsrcs; i++) { 1189 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1190 psf->sf_gsresp = 1; 1191 scount++; 1192 break; 1193 } 1194 } 1195 } 1196 if (!scount) { 1197 pmc->mca_flags &= ~MAF_GSQUERY; 1198 return false; 1199 } 1200 pmc->mca_flags |= MAF_GSQUERY; 1201 return true; 1202 } 1203 1204 static int mld_force_mld_version(const struct inet6_dev *idev) 1205 { 1206 const struct net *net = dev_net(idev->dev); 1207 int all_force; 1208 1209 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1210 /* Normally, both are 0 here. If enforcement to a particular is 1211 * being used, individual device enforcement will have a lower 1212 * precedence over 'all' device (.../conf/all/force_mld_version). 1213 */ 1214 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1215 } 1216 1217 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1218 { 1219 return mld_force_mld_version(idev) == 2; 1220 } 1221 1222 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1223 { 1224 return mld_force_mld_version(idev) == 1; 1225 } 1226 1227 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1228 { 1229 if (mld_in_v2_mode_only(idev)) 1230 return false; 1231 if (mld_in_v1_mode_only(idev)) 1232 return true; 1233 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1234 return true; 1235 1236 return false; 1237 } 1238 1239 static void mld_set_v1_mode(struct inet6_dev *idev) 1240 { 1241 /* RFC3810, relevant sections: 1242 * - 9.1. Robustness Variable 1243 * - 9.2. Query Interval 1244 * - 9.3. Query Response Interval 1245 * - 9.12. Older Version Querier Present Timeout 1246 */ 1247 unsigned long switchback; 1248 1249 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1250 1251 idev->mc_v1_seen = jiffies + switchback; 1252 } 1253 1254 static void mld_update_qrv(struct inet6_dev *idev, 1255 const struct mld2_query *mlh2) 1256 { 1257 /* RFC3810, relevant sections: 1258 * - 5.1.8. QRV (Querier's Robustness Variable) 1259 * - 9.1. Robustness Variable 1260 */ 1261 1262 /* The value of the Robustness Variable MUST NOT be zero, 1263 * and SHOULD NOT be one. Catch this here if we ever run 1264 * into such a case in future. 1265 */ 1266 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1267 WARN_ON(idev->mc_qrv == 0); 1268 1269 if (mlh2->mld2q_qrv > 0) 1270 idev->mc_qrv = mlh2->mld2q_qrv; 1271 1272 if (unlikely(idev->mc_qrv < min_qrv)) { 1273 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1274 idev->mc_qrv, min_qrv); 1275 idev->mc_qrv = min_qrv; 1276 } 1277 } 1278 1279 static void mld_update_qi(struct inet6_dev *idev, 1280 const struct mld2_query *mlh2) 1281 { 1282 /* RFC3810, relevant sections: 1283 * - 5.1.9. QQIC (Querier's Query Interval Code) 1284 * - 9.2. Query Interval 1285 * - 9.12. Older Version Querier Present Timeout 1286 * (the [Query Interval] in the last Query received) 1287 */ 1288 unsigned long mc_qqi; 1289 1290 if (mlh2->mld2q_qqic < 128) { 1291 mc_qqi = mlh2->mld2q_qqic; 1292 } else { 1293 unsigned long mc_man, mc_exp; 1294 1295 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1296 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1297 1298 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1299 } 1300 1301 idev->mc_qi = mc_qqi * HZ; 1302 } 1303 1304 static void mld_update_qri(struct inet6_dev *idev, 1305 const struct mld2_query *mlh2) 1306 { 1307 /* RFC3810, relevant sections: 1308 * - 5.1.3. Maximum Response Code 1309 * - 9.3. Query Response Interval 1310 */ 1311 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1312 } 1313 1314 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1315 unsigned long *max_delay, bool v1_query) 1316 { 1317 unsigned long mldv1_md; 1318 1319 /* Ignore v1 queries */ 1320 if (mld_in_v2_mode_only(idev)) 1321 return -EINVAL; 1322 1323 mldv1_md = ntohs(mld->mld_maxdelay); 1324 1325 /* When in MLDv1 fallback and a MLDv2 router start-up being 1326 * unaware of current MLDv1 operation, the MRC == MRD mapping 1327 * only works when the exponential algorithm is not being 1328 * used (as MLDv1 is unaware of such things). 1329 * 1330 * According to the RFC author, the MLDv2 implementations 1331 * he's aware of all use a MRC < 32768 on start up queries. 1332 * 1333 * Thus, should we *ever* encounter something else larger 1334 * than that, just assume the maximum possible within our 1335 * reach. 1336 */ 1337 if (!v1_query) 1338 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1339 1340 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1341 1342 /* MLDv1 router present: we need to go into v1 mode *only* 1343 * when an MLDv1 query is received as per section 9.12. of 1344 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1345 * queries MUST be of exactly 24 octets. 1346 */ 1347 if (v1_query) 1348 mld_set_v1_mode(idev); 1349 1350 /* cancel MLDv2 report work */ 1351 mld_gq_stop_work(idev); 1352 /* cancel the interface change work */ 1353 mld_ifc_stop_work(idev); 1354 /* clear deleted report items */ 1355 mld_clear_delrec(idev); 1356 1357 return 0; 1358 } 1359 1360 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1361 unsigned long *max_delay) 1362 { 1363 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1364 1365 mld_update_qrv(idev, mld); 1366 mld_update_qi(idev, mld); 1367 mld_update_qri(idev, mld); 1368 1369 idev->mc_maxdelay = *max_delay; 1370 1371 return; 1372 } 1373 1374 /* called with rcu_read_lock() */ 1375 void igmp6_event_query(struct sk_buff *skb) 1376 { 1377 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1378 1379 if (!idev || idev->dead) 1380 goto out; 1381 1382 spin_lock_bh(&idev->mc_query_lock); 1383 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1384 __skb_queue_tail(&idev->mc_query_queue, skb); 1385 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1386 in6_dev_hold(idev); 1387 skb = NULL; 1388 } 1389 spin_unlock_bh(&idev->mc_query_lock); 1390 out: 1391 kfree_skb(skb); 1392 } 1393 1394 static void __mld_query_work(struct sk_buff *skb) 1395 { 1396 struct mld2_query *mlh2 = NULL; 1397 const struct in6_addr *group; 1398 unsigned long max_delay; 1399 struct inet6_dev *idev; 1400 struct ifmcaddr6 *ma; 1401 struct mld_msg *mld; 1402 int group_type; 1403 int mark = 0; 1404 int len, err; 1405 1406 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1407 goto kfree_skb; 1408 1409 /* compute payload length excluding extension headers */ 1410 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1411 len -= skb_network_header_len(skb); 1412 1413 /* RFC3810 6.2 1414 * Upon reception of an MLD message that contains a Query, the node 1415 * checks if the source address of the message is a valid link-local 1416 * address, if the Hop Limit is set to 1, and if the Router Alert 1417 * option is present in the Hop-By-Hop Options header of the IPv6 1418 * packet. If any of these checks fails, the packet is dropped. 1419 */ 1420 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1421 ipv6_hdr(skb)->hop_limit != 1 || 1422 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1423 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1424 goto kfree_skb; 1425 1426 idev = in6_dev_get(skb->dev); 1427 if (!idev) 1428 goto kfree_skb; 1429 1430 mld = (struct mld_msg *)icmp6_hdr(skb); 1431 group = &mld->mld_mca; 1432 group_type = ipv6_addr_type(group); 1433 1434 if (group_type != IPV6_ADDR_ANY && 1435 !(group_type&IPV6_ADDR_MULTICAST)) 1436 goto out; 1437 1438 if (len < MLD_V1_QUERY_LEN) { 1439 goto out; 1440 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1441 err = mld_process_v1(idev, mld, &max_delay, 1442 len == MLD_V1_QUERY_LEN); 1443 if (err < 0) 1444 goto out; 1445 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1446 int srcs_offset = sizeof(struct mld2_query) - 1447 sizeof(struct icmp6hdr); 1448 1449 if (!pskb_may_pull(skb, srcs_offset)) 1450 goto out; 1451 1452 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1453 1454 mld_process_v2(idev, mlh2, &max_delay); 1455 1456 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1457 if (mlh2->mld2q_nsrcs) 1458 goto out; /* no sources allowed */ 1459 1460 mld_gq_start_work(idev); 1461 goto out; 1462 } 1463 /* mark sources to include, if group & source-specific */ 1464 if (mlh2->mld2q_nsrcs != 0) { 1465 if (!pskb_may_pull(skb, srcs_offset + 1466 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1467 goto out; 1468 1469 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1470 mark = 1; 1471 } 1472 } else { 1473 goto out; 1474 } 1475 1476 if (group_type == IPV6_ADDR_ANY) { 1477 for_each_mc_mclock(idev, ma) { 1478 igmp6_group_queried(ma, max_delay); 1479 } 1480 } else { 1481 for_each_mc_mclock(idev, ma) { 1482 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1483 continue; 1484 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1485 /* gsquery <- gsquery && mark */ 1486 if (!mark) 1487 ma->mca_flags &= ~MAF_GSQUERY; 1488 } else { 1489 /* gsquery <- mark */ 1490 if (mark) 1491 ma->mca_flags |= MAF_GSQUERY; 1492 else 1493 ma->mca_flags &= ~MAF_GSQUERY; 1494 } 1495 if (!(ma->mca_flags & MAF_GSQUERY) || 1496 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1497 igmp6_group_queried(ma, max_delay); 1498 break; 1499 } 1500 } 1501 1502 out: 1503 in6_dev_put(idev); 1504 kfree_skb: 1505 consume_skb(skb); 1506 } 1507 1508 static void mld_query_work(struct work_struct *work) 1509 { 1510 struct inet6_dev *idev = container_of(to_delayed_work(work), 1511 struct inet6_dev, 1512 mc_query_work); 1513 struct sk_buff_head q; 1514 struct sk_buff *skb; 1515 bool rework = false; 1516 int cnt = 0; 1517 1518 skb_queue_head_init(&q); 1519 1520 spin_lock_bh(&idev->mc_query_lock); 1521 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1522 __skb_queue_tail(&q, skb); 1523 1524 if (++cnt >= MLD_MAX_QUEUE) { 1525 rework = true; 1526 break; 1527 } 1528 } 1529 spin_unlock_bh(&idev->mc_query_lock); 1530 1531 mutex_lock(&idev->mc_lock); 1532 while ((skb = __skb_dequeue(&q))) 1533 __mld_query_work(skb); 1534 mutex_unlock(&idev->mc_lock); 1535 1536 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1537 return; 1538 1539 in6_dev_put(idev); 1540 } 1541 1542 /* called with rcu_read_lock() */ 1543 void igmp6_event_report(struct sk_buff *skb) 1544 { 1545 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1546 1547 if (!idev || idev->dead) 1548 goto out; 1549 1550 spin_lock_bh(&idev->mc_report_lock); 1551 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1552 __skb_queue_tail(&idev->mc_report_queue, skb); 1553 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1554 in6_dev_hold(idev); 1555 skb = NULL; 1556 } 1557 spin_unlock_bh(&idev->mc_report_lock); 1558 out: 1559 kfree_skb(skb); 1560 } 1561 1562 static void __mld_report_work(struct sk_buff *skb) 1563 { 1564 struct inet6_dev *idev; 1565 struct ifmcaddr6 *ma; 1566 struct mld_msg *mld; 1567 int addr_type; 1568 1569 /* Our own report looped back. Ignore it. */ 1570 if (skb->pkt_type == PACKET_LOOPBACK) 1571 goto kfree_skb; 1572 1573 /* send our report if the MC router may not have heard this report */ 1574 if (skb->pkt_type != PACKET_MULTICAST && 1575 skb->pkt_type != PACKET_BROADCAST) 1576 goto kfree_skb; 1577 1578 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1579 goto kfree_skb; 1580 1581 mld = (struct mld_msg *)icmp6_hdr(skb); 1582 1583 /* Drop reports with not link local source */ 1584 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1585 if (addr_type != IPV6_ADDR_ANY && 1586 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1587 goto kfree_skb; 1588 1589 idev = in6_dev_get(skb->dev); 1590 if (!idev) 1591 goto kfree_skb; 1592 1593 /* 1594 * Cancel the work for this group 1595 */ 1596 1597 for_each_mc_mclock(idev, ma) { 1598 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1599 if (cancel_delayed_work(&ma->mca_work)) 1600 refcount_dec(&ma->mca_refcnt); 1601 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1602 MAF_TIMER_RUNNING); 1603 break; 1604 } 1605 } 1606 1607 in6_dev_put(idev); 1608 kfree_skb: 1609 consume_skb(skb); 1610 } 1611 1612 static void mld_report_work(struct work_struct *work) 1613 { 1614 struct inet6_dev *idev = container_of(to_delayed_work(work), 1615 struct inet6_dev, 1616 mc_report_work); 1617 struct sk_buff_head q; 1618 struct sk_buff *skb; 1619 bool rework = false; 1620 int cnt = 0; 1621 1622 skb_queue_head_init(&q); 1623 spin_lock_bh(&idev->mc_report_lock); 1624 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1625 __skb_queue_tail(&q, skb); 1626 1627 if (++cnt >= MLD_MAX_QUEUE) { 1628 rework = true; 1629 break; 1630 } 1631 } 1632 spin_unlock_bh(&idev->mc_report_lock); 1633 1634 mutex_lock(&idev->mc_lock); 1635 while ((skb = __skb_dequeue(&q))) 1636 __mld_report_work(skb); 1637 mutex_unlock(&idev->mc_lock); 1638 1639 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1640 return; 1641 1642 in6_dev_put(idev); 1643 } 1644 1645 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1646 int gdeleted, int sdeleted) 1647 { 1648 switch (type) { 1649 case MLD2_MODE_IS_INCLUDE: 1650 case MLD2_MODE_IS_EXCLUDE: 1651 if (gdeleted || sdeleted) 1652 return false; 1653 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1654 if (pmc->mca_sfmode == MCAST_INCLUDE) 1655 return true; 1656 /* don't include if this source is excluded 1657 * in all filters 1658 */ 1659 if (psf->sf_count[MCAST_INCLUDE]) 1660 return type == MLD2_MODE_IS_INCLUDE; 1661 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1662 psf->sf_count[MCAST_EXCLUDE]; 1663 } 1664 return false; 1665 case MLD2_CHANGE_TO_INCLUDE: 1666 if (gdeleted || sdeleted) 1667 return false; 1668 return psf->sf_count[MCAST_INCLUDE] != 0; 1669 case MLD2_CHANGE_TO_EXCLUDE: 1670 if (gdeleted || sdeleted) 1671 return false; 1672 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1673 psf->sf_count[MCAST_INCLUDE]) 1674 return false; 1675 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1676 psf->sf_count[MCAST_EXCLUDE]; 1677 case MLD2_ALLOW_NEW_SOURCES: 1678 if (gdeleted || !psf->sf_crcount) 1679 return false; 1680 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1681 case MLD2_BLOCK_OLD_SOURCES: 1682 if (pmc->mca_sfmode == MCAST_INCLUDE) 1683 return gdeleted || (psf->sf_crcount && sdeleted); 1684 return psf->sf_crcount && !gdeleted && !sdeleted; 1685 } 1686 return false; 1687 } 1688 1689 static int 1690 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1691 { 1692 struct ip6_sf_list *psf; 1693 int scount = 0; 1694 1695 for_each_psf_mclock(pmc, psf) { 1696 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1697 continue; 1698 scount++; 1699 } 1700 return scount; 1701 } 1702 1703 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1704 struct net_device *dev, const struct in6_addr *saddr, 1705 const struct in6_addr *daddr, int proto, int len) 1706 { 1707 struct ipv6hdr *hdr; 1708 1709 skb->protocol = htons(ETH_P_IPV6); 1710 skb->dev = dev; 1711 1712 skb_reset_network_header(skb); 1713 skb_put(skb, sizeof(struct ipv6hdr)); 1714 hdr = ipv6_hdr(skb); 1715 1716 ip6_flow_hdr(hdr, 0, 0); 1717 1718 hdr->payload_len = htons(len); 1719 hdr->nexthdr = proto; 1720 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1721 1722 hdr->saddr = *saddr; 1723 hdr->daddr = *daddr; 1724 } 1725 1726 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1727 { 1728 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1729 2, 0, 0, IPV6_TLV_PADN, 0 }; 1730 struct net_device *dev = idev->dev; 1731 int hlen = LL_RESERVED_SPACE(dev); 1732 int tlen = dev->needed_tailroom; 1733 struct net *net = dev_net(dev); 1734 const struct in6_addr *saddr; 1735 struct in6_addr addr_buf; 1736 struct mld2_report *pmr; 1737 struct sk_buff *skb; 1738 unsigned int size; 1739 struct sock *sk; 1740 int err; 1741 1742 sk = net->ipv6.igmp_sk; 1743 /* we assume size > sizeof(ra) here 1744 * Also try to not allocate high-order pages for big MTU 1745 */ 1746 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1747 skb = sock_alloc_send_skb(sk, size, 1, &err); 1748 if (!skb) 1749 return NULL; 1750 1751 skb->priority = TC_PRIO_CONTROL; 1752 skb_reserve(skb, hlen); 1753 skb_tailroom_reserve(skb, mtu, tlen); 1754 1755 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1756 /* <draft-ietf-magma-mld-source-05.txt>: 1757 * use unspecified address as the source address 1758 * when a valid link-local address is not available. 1759 */ 1760 saddr = &in6addr_any; 1761 } else 1762 saddr = &addr_buf; 1763 1764 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1765 1766 skb_put_data(skb, ra, sizeof(ra)); 1767 1768 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1769 skb_put(skb, sizeof(*pmr)); 1770 pmr = (struct mld2_report *)skb_transport_header(skb); 1771 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1772 pmr->mld2r_resv1 = 0; 1773 pmr->mld2r_cksum = 0; 1774 pmr->mld2r_resv2 = 0; 1775 pmr->mld2r_ngrec = 0; 1776 return skb; 1777 } 1778 1779 static void mld_sendpack(struct sk_buff *skb) 1780 { 1781 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1782 struct mld2_report *pmr = 1783 (struct mld2_report *)skb_transport_header(skb); 1784 int payload_len, mldlen; 1785 struct inet6_dev *idev; 1786 struct net *net = dev_net(skb->dev); 1787 int err; 1788 struct flowi6 fl6; 1789 struct dst_entry *dst; 1790 1791 rcu_read_lock(); 1792 idev = __in6_dev_get(skb->dev); 1793 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1794 1795 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1796 sizeof(*pip6); 1797 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1798 pip6->payload_len = htons(payload_len); 1799 1800 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1801 IPPROTO_ICMPV6, 1802 csum_partial(skb_transport_header(skb), 1803 mldlen, 0)); 1804 1805 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1806 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1807 skb->dev->ifindex); 1808 dst = icmp6_dst_alloc(skb->dev, &fl6); 1809 1810 err = 0; 1811 if (IS_ERR(dst)) { 1812 err = PTR_ERR(dst); 1813 dst = NULL; 1814 } 1815 skb_dst_set(skb, dst); 1816 if (err) 1817 goto err_out; 1818 1819 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1820 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1821 dst_output); 1822 out: 1823 if (!err) { 1824 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1825 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1826 } else { 1827 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1828 } 1829 1830 rcu_read_unlock(); 1831 return; 1832 1833 err_out: 1834 kfree_skb(skb); 1835 goto out; 1836 } 1837 1838 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1839 { 1840 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1841 } 1842 1843 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1844 int type, struct mld2_grec **ppgr, unsigned int mtu) 1845 { 1846 struct mld2_report *pmr; 1847 struct mld2_grec *pgr; 1848 1849 if (!skb) { 1850 skb = mld_newpack(pmc->idev, mtu); 1851 if (!skb) 1852 return NULL; 1853 } 1854 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1855 pgr->grec_type = type; 1856 pgr->grec_auxwords = 0; 1857 pgr->grec_nsrcs = 0; 1858 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1859 pmr = (struct mld2_report *)skb_transport_header(skb); 1860 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1861 *ppgr = pgr; 1862 return skb; 1863 } 1864 1865 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1866 1867 /* called with mc_lock */ 1868 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1869 int type, int gdeleted, int sdeleted, 1870 int crsend) 1871 { 1872 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1873 int scount, stotal, first, isquery, truncate; 1874 struct ip6_sf_list __rcu **psf_list; 1875 struct inet6_dev *idev = pmc->idev; 1876 struct net_device *dev = idev->dev; 1877 struct mld2_grec *pgr = NULL; 1878 struct mld2_report *pmr; 1879 unsigned int mtu; 1880 1881 if (pmc->mca_flags & MAF_NOREPORT) 1882 return skb; 1883 1884 mtu = READ_ONCE(dev->mtu); 1885 if (mtu < IPV6_MIN_MTU) 1886 return skb; 1887 1888 isquery = type == MLD2_MODE_IS_INCLUDE || 1889 type == MLD2_MODE_IS_EXCLUDE; 1890 truncate = type == MLD2_MODE_IS_EXCLUDE || 1891 type == MLD2_CHANGE_TO_EXCLUDE; 1892 1893 stotal = scount = 0; 1894 1895 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1896 1897 if (!rcu_access_pointer(*psf_list)) 1898 goto empty_source; 1899 1900 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1901 1902 /* EX and TO_EX get a fresh packet, if needed */ 1903 if (truncate) { 1904 if (pmr && pmr->mld2r_ngrec && 1905 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1906 if (skb) 1907 mld_sendpack(skb); 1908 skb = mld_newpack(idev, mtu); 1909 } 1910 } 1911 first = 1; 1912 psf_prev = NULL; 1913 for (psf = mc_dereference(*psf_list, idev); 1914 psf; 1915 psf = psf_next) { 1916 struct in6_addr *psrc; 1917 1918 psf_next = mc_dereference(psf->sf_next, idev); 1919 1920 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1921 psf_prev = psf; 1922 continue; 1923 } 1924 1925 /* Based on RFC3810 6.1. Should not send source-list change 1926 * records when there is a filter mode change. 1927 */ 1928 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1929 (!gdeleted && pmc->mca_crcount)) && 1930 (type == MLD2_ALLOW_NEW_SOURCES || 1931 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1932 goto decrease_sf_crcount; 1933 1934 /* clear marks on query responses */ 1935 if (isquery) 1936 psf->sf_gsresp = 0; 1937 1938 if (AVAILABLE(skb) < sizeof(*psrc) + 1939 first*sizeof(struct mld2_grec)) { 1940 if (truncate && !first) 1941 break; /* truncate these */ 1942 if (pgr) 1943 pgr->grec_nsrcs = htons(scount); 1944 if (skb) 1945 mld_sendpack(skb); 1946 skb = mld_newpack(idev, mtu); 1947 first = 1; 1948 scount = 0; 1949 } 1950 if (first) { 1951 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1952 first = 0; 1953 } 1954 if (!skb) 1955 return NULL; 1956 psrc = skb_put(skb, sizeof(*psrc)); 1957 *psrc = psf->sf_addr; 1958 scount++; stotal++; 1959 if ((type == MLD2_ALLOW_NEW_SOURCES || 1960 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1961 decrease_sf_crcount: 1962 psf->sf_crcount--; 1963 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1964 if (psf_prev) 1965 rcu_assign_pointer(psf_prev->sf_next, 1966 mc_dereference(psf->sf_next, idev)); 1967 else 1968 rcu_assign_pointer(*psf_list, 1969 mc_dereference(psf->sf_next, idev)); 1970 kfree_rcu(psf, rcu); 1971 continue; 1972 } 1973 } 1974 psf_prev = psf; 1975 } 1976 1977 empty_source: 1978 if (!stotal) { 1979 if (type == MLD2_ALLOW_NEW_SOURCES || 1980 type == MLD2_BLOCK_OLD_SOURCES) 1981 return skb; 1982 if (pmc->mca_crcount || isquery || crsend) { 1983 /* make sure we have room for group header */ 1984 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1985 mld_sendpack(skb); 1986 skb = NULL; /* add_grhead will get a new one */ 1987 } 1988 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1989 } 1990 } 1991 if (pgr) 1992 pgr->grec_nsrcs = htons(scount); 1993 1994 if (isquery) 1995 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1996 return skb; 1997 } 1998 1999 /* called with mc_lock */ 2000 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2001 { 2002 struct sk_buff *skb = NULL; 2003 int type; 2004 2005 if (!pmc) { 2006 for_each_mc_mclock(idev, pmc) { 2007 if (pmc->mca_flags & MAF_NOREPORT) 2008 continue; 2009 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2010 type = MLD2_MODE_IS_EXCLUDE; 2011 else 2012 type = MLD2_MODE_IS_INCLUDE; 2013 skb = add_grec(skb, pmc, type, 0, 0, 0); 2014 } 2015 } else { 2016 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2017 type = MLD2_MODE_IS_EXCLUDE; 2018 else 2019 type = MLD2_MODE_IS_INCLUDE; 2020 skb = add_grec(skb, pmc, type, 0, 0, 0); 2021 } 2022 if (skb) 2023 mld_sendpack(skb); 2024 } 2025 2026 /* 2027 * remove zero-count source records from a source filter list 2028 * called with mc_lock 2029 */ 2030 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2031 { 2032 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2033 2034 psf_prev = NULL; 2035 for (psf = mc_dereference(*ppsf, idev); 2036 psf; 2037 psf = psf_next) { 2038 psf_next = mc_dereference(psf->sf_next, idev); 2039 if (psf->sf_crcount == 0) { 2040 if (psf_prev) 2041 rcu_assign_pointer(psf_prev->sf_next, 2042 mc_dereference(psf->sf_next, idev)); 2043 else 2044 rcu_assign_pointer(*ppsf, 2045 mc_dereference(psf->sf_next, idev)); 2046 kfree_rcu(psf, rcu); 2047 } else { 2048 psf_prev = psf; 2049 } 2050 } 2051 } 2052 2053 /* called with mc_lock */ 2054 static void mld_send_cr(struct inet6_dev *idev) 2055 { 2056 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2057 struct sk_buff *skb = NULL; 2058 int type, dtype; 2059 2060 /* deleted MCA's */ 2061 pmc_prev = NULL; 2062 for (pmc = mc_dereference(idev->mc_tomb, idev); 2063 pmc; 2064 pmc = pmc_next) { 2065 pmc_next = mc_dereference(pmc->next, idev); 2066 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2067 type = MLD2_BLOCK_OLD_SOURCES; 2068 dtype = MLD2_BLOCK_OLD_SOURCES; 2069 skb = add_grec(skb, pmc, type, 1, 0, 0); 2070 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2071 } 2072 if (pmc->mca_crcount) { 2073 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2074 type = MLD2_CHANGE_TO_INCLUDE; 2075 skb = add_grec(skb, pmc, type, 1, 0, 0); 2076 } 2077 pmc->mca_crcount--; 2078 if (pmc->mca_crcount == 0) { 2079 mld_clear_zeros(&pmc->mca_tomb, idev); 2080 mld_clear_zeros(&pmc->mca_sources, idev); 2081 } 2082 } 2083 if (pmc->mca_crcount == 0 && 2084 !rcu_access_pointer(pmc->mca_tomb) && 2085 !rcu_access_pointer(pmc->mca_sources)) { 2086 if (pmc_prev) 2087 rcu_assign_pointer(pmc_prev->next, pmc_next); 2088 else 2089 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2090 in6_dev_put(pmc->idev); 2091 kfree_rcu(pmc, rcu); 2092 } else 2093 pmc_prev = pmc; 2094 } 2095 2096 /* change recs */ 2097 for_each_mc_mclock(idev, pmc) { 2098 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2099 type = MLD2_BLOCK_OLD_SOURCES; 2100 dtype = MLD2_ALLOW_NEW_SOURCES; 2101 } else { 2102 type = MLD2_ALLOW_NEW_SOURCES; 2103 dtype = MLD2_BLOCK_OLD_SOURCES; 2104 } 2105 skb = add_grec(skb, pmc, type, 0, 0, 0); 2106 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2107 2108 /* filter mode changes */ 2109 if (pmc->mca_crcount) { 2110 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2111 type = MLD2_CHANGE_TO_EXCLUDE; 2112 else 2113 type = MLD2_CHANGE_TO_INCLUDE; 2114 skb = add_grec(skb, pmc, type, 0, 0, 0); 2115 pmc->mca_crcount--; 2116 } 2117 } 2118 if (!skb) 2119 return; 2120 (void) mld_sendpack(skb); 2121 } 2122 2123 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2124 { 2125 struct net *net = dev_net(dev); 2126 struct sock *sk = net->ipv6.igmp_sk; 2127 struct inet6_dev *idev; 2128 struct sk_buff *skb; 2129 struct mld_msg *hdr; 2130 const struct in6_addr *snd_addr, *saddr; 2131 struct in6_addr addr_buf; 2132 int hlen = LL_RESERVED_SPACE(dev); 2133 int tlen = dev->needed_tailroom; 2134 int err, len, payload_len, full_len; 2135 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2136 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2137 IPV6_TLV_PADN, 0 }; 2138 struct flowi6 fl6; 2139 struct dst_entry *dst; 2140 2141 if (type == ICMPV6_MGM_REDUCTION) 2142 snd_addr = &in6addr_linklocal_allrouters; 2143 else 2144 snd_addr = addr; 2145 2146 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2147 payload_len = len + sizeof(ra); 2148 full_len = sizeof(struct ipv6hdr) + payload_len; 2149 2150 rcu_read_lock(); 2151 IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_OUTREQUESTS); 2152 rcu_read_unlock(); 2153 2154 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2155 2156 if (!skb) { 2157 rcu_read_lock(); 2158 IP6_INC_STATS(net, __in6_dev_get(dev), 2159 IPSTATS_MIB_OUTDISCARDS); 2160 rcu_read_unlock(); 2161 return; 2162 } 2163 skb->priority = TC_PRIO_CONTROL; 2164 skb_reserve(skb, hlen); 2165 2166 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2167 /* <draft-ietf-magma-mld-source-05.txt>: 2168 * use unspecified address as the source address 2169 * when a valid link-local address is not available. 2170 */ 2171 saddr = &in6addr_any; 2172 } else 2173 saddr = &addr_buf; 2174 2175 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2176 2177 skb_put_data(skb, ra, sizeof(ra)); 2178 2179 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2180 hdr->mld_type = type; 2181 hdr->mld_mca = *addr; 2182 2183 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2184 IPPROTO_ICMPV6, 2185 csum_partial(hdr, len, 0)); 2186 2187 rcu_read_lock(); 2188 idev = __in6_dev_get(skb->dev); 2189 2190 icmpv6_flow_init(sk, &fl6, type, 2191 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2192 skb->dev->ifindex); 2193 dst = icmp6_dst_alloc(skb->dev, &fl6); 2194 if (IS_ERR(dst)) { 2195 err = PTR_ERR(dst); 2196 goto err_out; 2197 } 2198 2199 skb_dst_set(skb, dst); 2200 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2201 net, sk, skb, NULL, skb->dev, 2202 dst_output); 2203 out: 2204 if (!err) { 2205 ICMP6MSGOUT_INC_STATS(net, idev, type); 2206 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2207 } else 2208 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2209 2210 rcu_read_unlock(); 2211 return; 2212 2213 err_out: 2214 kfree_skb(skb); 2215 goto out; 2216 } 2217 2218 /* called with mc_lock */ 2219 static void mld_send_initial_cr(struct inet6_dev *idev) 2220 { 2221 struct sk_buff *skb; 2222 struct ifmcaddr6 *pmc; 2223 int type; 2224 2225 if (mld_in_v1_mode(idev)) 2226 return; 2227 2228 skb = NULL; 2229 for_each_mc_mclock(idev, pmc) { 2230 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2231 type = MLD2_CHANGE_TO_EXCLUDE; 2232 else 2233 type = MLD2_ALLOW_NEW_SOURCES; 2234 skb = add_grec(skb, pmc, type, 0, 0, 1); 2235 } 2236 if (skb) 2237 mld_sendpack(skb); 2238 } 2239 2240 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2241 { 2242 mutex_lock(&idev->mc_lock); 2243 idev->mc_dad_count = idev->mc_qrv; 2244 if (idev->mc_dad_count) { 2245 mld_send_initial_cr(idev); 2246 idev->mc_dad_count--; 2247 if (idev->mc_dad_count) 2248 mld_dad_start_work(idev, 2249 unsolicited_report_interval(idev)); 2250 } 2251 mutex_unlock(&idev->mc_lock); 2252 } 2253 2254 static void mld_dad_work(struct work_struct *work) 2255 { 2256 struct inet6_dev *idev = container_of(to_delayed_work(work), 2257 struct inet6_dev, 2258 mc_dad_work); 2259 mutex_lock(&idev->mc_lock); 2260 mld_send_initial_cr(idev); 2261 if (idev->mc_dad_count) { 2262 idev->mc_dad_count--; 2263 if (idev->mc_dad_count) 2264 mld_dad_start_work(idev, 2265 unsolicited_report_interval(idev)); 2266 } 2267 mutex_unlock(&idev->mc_lock); 2268 in6_dev_put(idev); 2269 } 2270 2271 /* called with mc_lock */ 2272 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2273 const struct in6_addr *psfsrc) 2274 { 2275 struct ip6_sf_list *psf, *psf_prev; 2276 int rv = 0; 2277 2278 psf_prev = NULL; 2279 for_each_psf_mclock(pmc, psf) { 2280 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2281 break; 2282 psf_prev = psf; 2283 } 2284 if (!psf || psf->sf_count[sfmode] == 0) { 2285 /* source filter not found, or count wrong => bug */ 2286 return -ESRCH; 2287 } 2288 psf->sf_count[sfmode]--; 2289 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2290 struct inet6_dev *idev = pmc->idev; 2291 2292 /* no more filters for this source */ 2293 if (psf_prev) 2294 rcu_assign_pointer(psf_prev->sf_next, 2295 mc_dereference(psf->sf_next, idev)); 2296 else 2297 rcu_assign_pointer(pmc->mca_sources, 2298 mc_dereference(psf->sf_next, idev)); 2299 2300 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2301 !mld_in_v1_mode(idev)) { 2302 psf->sf_crcount = idev->mc_qrv; 2303 rcu_assign_pointer(psf->sf_next, 2304 mc_dereference(pmc->mca_tomb, idev)); 2305 rcu_assign_pointer(pmc->mca_tomb, psf); 2306 rv = 1; 2307 } else { 2308 kfree_rcu(psf, rcu); 2309 } 2310 } 2311 return rv; 2312 } 2313 2314 /* called with mc_lock */ 2315 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2316 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2317 int delta) 2318 { 2319 struct ifmcaddr6 *pmc; 2320 int changerec = 0; 2321 int i, err; 2322 2323 if (!idev) 2324 return -ENODEV; 2325 2326 for_each_mc_mclock(idev, pmc) { 2327 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2328 break; 2329 } 2330 if (!pmc) 2331 return -ESRCH; 2332 2333 sf_markstate(pmc); 2334 if (!delta) { 2335 if (!pmc->mca_sfcount[sfmode]) 2336 return -EINVAL; 2337 2338 pmc->mca_sfcount[sfmode]--; 2339 } 2340 err = 0; 2341 for (i = 0; i < sfcount; i++) { 2342 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2343 2344 changerec |= rv > 0; 2345 if (!err && rv < 0) 2346 err = rv; 2347 } 2348 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2349 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2350 pmc->mca_sfcount[MCAST_INCLUDE]) { 2351 struct ip6_sf_list *psf; 2352 2353 /* filter mode change */ 2354 pmc->mca_sfmode = MCAST_INCLUDE; 2355 pmc->mca_crcount = idev->mc_qrv; 2356 idev->mc_ifc_count = pmc->mca_crcount; 2357 for_each_psf_mclock(pmc, psf) 2358 psf->sf_crcount = 0; 2359 mld_ifc_event(pmc->idev); 2360 } else if (sf_setstate(pmc) || changerec) { 2361 mld_ifc_event(pmc->idev); 2362 } 2363 2364 return err; 2365 } 2366 2367 /* 2368 * Add multicast single-source filter to the interface list 2369 * called with mc_lock 2370 */ 2371 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2372 const struct in6_addr *psfsrc) 2373 { 2374 struct ip6_sf_list *psf, *psf_prev; 2375 2376 psf_prev = NULL; 2377 for_each_psf_mclock(pmc, psf) { 2378 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2379 break; 2380 psf_prev = psf; 2381 } 2382 if (!psf) { 2383 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2384 if (!psf) 2385 return -ENOBUFS; 2386 2387 psf->sf_addr = *psfsrc; 2388 if (psf_prev) { 2389 rcu_assign_pointer(psf_prev->sf_next, psf); 2390 } else { 2391 rcu_assign_pointer(pmc->mca_sources, psf); 2392 } 2393 } 2394 psf->sf_count[sfmode]++; 2395 return 0; 2396 } 2397 2398 /* called with mc_lock */ 2399 static void sf_markstate(struct ifmcaddr6 *pmc) 2400 { 2401 struct ip6_sf_list *psf; 2402 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2403 2404 for_each_psf_mclock(pmc, psf) { 2405 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2406 psf->sf_oldin = mca_xcount == 2407 psf->sf_count[MCAST_EXCLUDE] && 2408 !psf->sf_count[MCAST_INCLUDE]; 2409 } else { 2410 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2411 } 2412 } 2413 } 2414 2415 /* called with mc_lock */ 2416 static int sf_setstate(struct ifmcaddr6 *pmc) 2417 { 2418 struct ip6_sf_list *psf, *dpsf; 2419 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2420 int qrv = pmc->idev->mc_qrv; 2421 int new_in, rv; 2422 2423 rv = 0; 2424 for_each_psf_mclock(pmc, psf) { 2425 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2426 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2427 !psf->sf_count[MCAST_INCLUDE]; 2428 } else 2429 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2430 if (new_in) { 2431 if (!psf->sf_oldin) { 2432 struct ip6_sf_list *prev = NULL; 2433 2434 for_each_psf_tomb(pmc, dpsf) { 2435 if (ipv6_addr_equal(&dpsf->sf_addr, 2436 &psf->sf_addr)) 2437 break; 2438 prev = dpsf; 2439 } 2440 if (dpsf) { 2441 if (prev) 2442 rcu_assign_pointer(prev->sf_next, 2443 mc_dereference(dpsf->sf_next, 2444 pmc->idev)); 2445 else 2446 rcu_assign_pointer(pmc->mca_tomb, 2447 mc_dereference(dpsf->sf_next, 2448 pmc->idev)); 2449 kfree_rcu(dpsf, rcu); 2450 } 2451 psf->sf_crcount = qrv; 2452 rv++; 2453 } 2454 } else if (psf->sf_oldin) { 2455 psf->sf_crcount = 0; 2456 /* 2457 * add or update "delete" records if an active filter 2458 * is now inactive 2459 */ 2460 2461 for_each_psf_tomb(pmc, dpsf) 2462 if (ipv6_addr_equal(&dpsf->sf_addr, 2463 &psf->sf_addr)) 2464 break; 2465 if (!dpsf) { 2466 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2467 if (!dpsf) 2468 continue; 2469 *dpsf = *psf; 2470 rcu_assign_pointer(dpsf->sf_next, 2471 mc_dereference(pmc->mca_tomb, pmc->idev)); 2472 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2473 } 2474 dpsf->sf_crcount = qrv; 2475 rv++; 2476 } 2477 } 2478 return rv; 2479 } 2480 2481 /* 2482 * Add multicast source filter list to the interface list 2483 * called with mc_lock 2484 */ 2485 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2486 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2487 int delta) 2488 { 2489 struct ifmcaddr6 *pmc; 2490 int isexclude; 2491 int i, err; 2492 2493 if (!idev) 2494 return -ENODEV; 2495 2496 for_each_mc_mclock(idev, pmc) { 2497 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2498 break; 2499 } 2500 if (!pmc) 2501 return -ESRCH; 2502 2503 sf_markstate(pmc); 2504 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2505 if (!delta) 2506 pmc->mca_sfcount[sfmode]++; 2507 err = 0; 2508 for (i = 0; i < sfcount; i++) { 2509 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2510 if (err) 2511 break; 2512 } 2513 if (err) { 2514 int j; 2515 2516 if (!delta) 2517 pmc->mca_sfcount[sfmode]--; 2518 for (j = 0; j < i; j++) 2519 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2520 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2521 struct ip6_sf_list *psf; 2522 2523 /* filter mode change */ 2524 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2525 pmc->mca_sfmode = MCAST_EXCLUDE; 2526 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2527 pmc->mca_sfmode = MCAST_INCLUDE; 2528 /* else no filters; keep old mode for reports */ 2529 2530 pmc->mca_crcount = idev->mc_qrv; 2531 idev->mc_ifc_count = pmc->mca_crcount; 2532 for_each_psf_mclock(pmc, psf) 2533 psf->sf_crcount = 0; 2534 mld_ifc_event(idev); 2535 } else if (sf_setstate(pmc)) { 2536 mld_ifc_event(idev); 2537 } 2538 return err; 2539 } 2540 2541 /* called with mc_lock */ 2542 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2543 { 2544 struct ip6_sf_list *psf, *nextpsf; 2545 2546 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2547 psf; 2548 psf = nextpsf) { 2549 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2550 kfree_rcu(psf, rcu); 2551 } 2552 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2553 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2554 psf; 2555 psf = nextpsf) { 2556 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2557 kfree_rcu(psf, rcu); 2558 } 2559 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2560 pmc->mca_sfmode = MCAST_EXCLUDE; 2561 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2562 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2563 } 2564 2565 /* called with mc_lock */ 2566 static void igmp6_join_group(struct ifmcaddr6 *ma) 2567 { 2568 unsigned long delay; 2569 2570 if (ma->mca_flags & MAF_NOREPORT) 2571 return; 2572 2573 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2574 2575 delay = get_random_u32_below(unsolicited_report_interval(ma->idev)); 2576 2577 if (cancel_delayed_work(&ma->mca_work)) { 2578 refcount_dec(&ma->mca_refcnt); 2579 delay = ma->mca_work.timer.expires - jiffies; 2580 } 2581 2582 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2583 refcount_inc(&ma->mca_refcnt); 2584 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2585 } 2586 2587 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2588 struct inet6_dev *idev) 2589 { 2590 struct ip6_sf_socklist *psl; 2591 int err; 2592 2593 psl = sock_dereference(iml->sflist, sk); 2594 2595 if (idev) 2596 mutex_lock(&idev->mc_lock); 2597 2598 if (!psl) { 2599 /* any-source empty exclude case */ 2600 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2601 } else { 2602 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2603 psl->sl_count, psl->sl_addr, 0); 2604 RCU_INIT_POINTER(iml->sflist, NULL); 2605 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2606 &sk->sk_omem_alloc); 2607 kfree_rcu(psl, rcu); 2608 } 2609 2610 if (idev) 2611 mutex_unlock(&idev->mc_lock); 2612 2613 return err; 2614 } 2615 2616 /* called with mc_lock */ 2617 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2618 { 2619 if (mld_in_v1_mode(ma->idev)) { 2620 if (ma->mca_flags & MAF_LAST_REPORTER) { 2621 igmp6_send(&ma->mca_addr, ma->idev->dev, 2622 ICMPV6_MGM_REDUCTION); 2623 } 2624 } else { 2625 mld_add_delrec(ma->idev, ma); 2626 mld_ifc_event(ma->idev); 2627 } 2628 } 2629 2630 static void mld_gq_work(struct work_struct *work) 2631 { 2632 struct inet6_dev *idev = container_of(to_delayed_work(work), 2633 struct inet6_dev, 2634 mc_gq_work); 2635 2636 mutex_lock(&idev->mc_lock); 2637 mld_send_report(idev, NULL); 2638 idev->mc_gq_running = 0; 2639 mutex_unlock(&idev->mc_lock); 2640 2641 in6_dev_put(idev); 2642 } 2643 2644 static void mld_ifc_work(struct work_struct *work) 2645 { 2646 struct inet6_dev *idev = container_of(to_delayed_work(work), 2647 struct inet6_dev, 2648 mc_ifc_work); 2649 2650 mutex_lock(&idev->mc_lock); 2651 mld_send_cr(idev); 2652 2653 if (idev->mc_ifc_count) { 2654 idev->mc_ifc_count--; 2655 if (idev->mc_ifc_count) 2656 mld_ifc_start_work(idev, 2657 unsolicited_report_interval(idev)); 2658 } 2659 mutex_unlock(&idev->mc_lock); 2660 in6_dev_put(idev); 2661 } 2662 2663 /* called with mc_lock */ 2664 static void mld_ifc_event(struct inet6_dev *idev) 2665 { 2666 if (mld_in_v1_mode(idev)) 2667 return; 2668 2669 idev->mc_ifc_count = idev->mc_qrv; 2670 mld_ifc_start_work(idev, 1); 2671 } 2672 2673 static void mld_mca_work(struct work_struct *work) 2674 { 2675 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2676 struct ifmcaddr6, mca_work); 2677 2678 mutex_lock(&ma->idev->mc_lock); 2679 if (mld_in_v1_mode(ma->idev)) 2680 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2681 else 2682 mld_send_report(ma->idev, ma); 2683 ma->mca_flags |= MAF_LAST_REPORTER; 2684 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2685 mutex_unlock(&ma->idev->mc_lock); 2686 2687 ma_put(ma); 2688 } 2689 2690 /* Device changing type */ 2691 2692 void ipv6_mc_unmap(struct inet6_dev *idev) 2693 { 2694 struct ifmcaddr6 *i; 2695 2696 /* Install multicast list, except for all-nodes (already installed) */ 2697 2698 mutex_lock(&idev->mc_lock); 2699 for_each_mc_mclock(idev, i) 2700 igmp6_group_dropped(i); 2701 mutex_unlock(&idev->mc_lock); 2702 } 2703 2704 void ipv6_mc_remap(struct inet6_dev *idev) 2705 { 2706 ipv6_mc_up(idev); 2707 } 2708 2709 /* Device going down */ 2710 void ipv6_mc_down(struct inet6_dev *idev) 2711 { 2712 struct ifmcaddr6 *i; 2713 2714 mutex_lock(&idev->mc_lock); 2715 /* Withdraw multicast list */ 2716 for_each_mc_mclock(idev, i) 2717 igmp6_group_dropped(i); 2718 mutex_unlock(&idev->mc_lock); 2719 2720 /* Should stop work after group drop. or we will 2721 * start work again in mld_ifc_event() 2722 */ 2723 mld_query_stop_work(idev); 2724 mld_report_stop_work(idev); 2725 2726 mutex_lock(&idev->mc_lock); 2727 mld_ifc_stop_work(idev); 2728 mld_gq_stop_work(idev); 2729 mutex_unlock(&idev->mc_lock); 2730 2731 mld_dad_stop_work(idev); 2732 } 2733 2734 static void ipv6_mc_reset(struct inet6_dev *idev) 2735 { 2736 idev->mc_qrv = sysctl_mld_qrv; 2737 idev->mc_qi = MLD_QI_DEFAULT; 2738 idev->mc_qri = MLD_QRI_DEFAULT; 2739 idev->mc_v1_seen = 0; 2740 idev->mc_maxdelay = unsolicited_report_interval(idev); 2741 } 2742 2743 /* Device going up */ 2744 2745 void ipv6_mc_up(struct inet6_dev *idev) 2746 { 2747 struct ifmcaddr6 *i; 2748 2749 /* Install multicast list, except for all-nodes (already installed) */ 2750 2751 ipv6_mc_reset(idev); 2752 mutex_lock(&idev->mc_lock); 2753 for_each_mc_mclock(idev, i) { 2754 mld_del_delrec(idev, i); 2755 igmp6_group_added(i); 2756 } 2757 mutex_unlock(&idev->mc_lock); 2758 } 2759 2760 /* IPv6 device initialization. */ 2761 2762 void ipv6_mc_init_dev(struct inet6_dev *idev) 2763 { 2764 idev->mc_gq_running = 0; 2765 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2766 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2767 idev->mc_ifc_count = 0; 2768 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2769 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2770 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2771 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2772 skb_queue_head_init(&idev->mc_query_queue); 2773 skb_queue_head_init(&idev->mc_report_queue); 2774 spin_lock_init(&idev->mc_query_lock); 2775 spin_lock_init(&idev->mc_report_lock); 2776 mutex_init(&idev->mc_lock); 2777 ipv6_mc_reset(idev); 2778 } 2779 2780 /* 2781 * Device is about to be destroyed: clean up. 2782 */ 2783 2784 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2785 { 2786 struct ifmcaddr6 *i; 2787 2788 /* Deactivate works */ 2789 ipv6_mc_down(idev); 2790 mutex_lock(&idev->mc_lock); 2791 mld_clear_delrec(idev); 2792 mutex_unlock(&idev->mc_lock); 2793 mld_clear_query(idev); 2794 mld_clear_report(idev); 2795 2796 /* Delete all-nodes address. */ 2797 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2798 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2799 * fail. 2800 */ 2801 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2802 2803 if (idev->cnf.forwarding) 2804 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2805 2806 mutex_lock(&idev->mc_lock); 2807 while ((i = mc_dereference(idev->mc_list, idev))) { 2808 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2809 2810 ip6_mc_clear_src(i); 2811 ma_put(i); 2812 } 2813 mutex_unlock(&idev->mc_lock); 2814 } 2815 2816 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2817 { 2818 struct ifmcaddr6 *pmc; 2819 2820 ASSERT_RTNL(); 2821 2822 mutex_lock(&idev->mc_lock); 2823 if (mld_in_v1_mode(idev)) { 2824 for_each_mc_mclock(idev, pmc) 2825 igmp6_join_group(pmc); 2826 } else { 2827 mld_send_report(idev, NULL); 2828 } 2829 mutex_unlock(&idev->mc_lock); 2830 } 2831 2832 static int ipv6_mc_netdev_event(struct notifier_block *this, 2833 unsigned long event, 2834 void *ptr) 2835 { 2836 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2837 struct inet6_dev *idev = __in6_dev_get(dev); 2838 2839 switch (event) { 2840 case NETDEV_RESEND_IGMP: 2841 if (idev) 2842 ipv6_mc_rejoin_groups(idev); 2843 break; 2844 default: 2845 break; 2846 } 2847 2848 return NOTIFY_DONE; 2849 } 2850 2851 static struct notifier_block igmp6_netdev_notifier = { 2852 .notifier_call = ipv6_mc_netdev_event, 2853 }; 2854 2855 #ifdef CONFIG_PROC_FS 2856 struct igmp6_mc_iter_state { 2857 struct seq_net_private p; 2858 struct net_device *dev; 2859 struct inet6_dev *idev; 2860 }; 2861 2862 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2863 2864 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2865 { 2866 struct ifmcaddr6 *im = NULL; 2867 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2868 struct net *net = seq_file_net(seq); 2869 2870 state->idev = NULL; 2871 for_each_netdev_rcu(net, state->dev) { 2872 struct inet6_dev *idev; 2873 idev = __in6_dev_get(state->dev); 2874 if (!idev) 2875 continue; 2876 2877 im = rcu_dereference(idev->mc_list); 2878 if (im) { 2879 state->idev = idev; 2880 break; 2881 } 2882 } 2883 return im; 2884 } 2885 2886 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2887 { 2888 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2889 2890 im = rcu_dereference(im->next); 2891 while (!im) { 2892 state->dev = next_net_device_rcu(state->dev); 2893 if (!state->dev) { 2894 state->idev = NULL; 2895 break; 2896 } 2897 state->idev = __in6_dev_get(state->dev); 2898 if (!state->idev) 2899 continue; 2900 im = rcu_dereference(state->idev->mc_list); 2901 } 2902 return im; 2903 } 2904 2905 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2906 { 2907 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2908 if (im) 2909 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2910 --pos; 2911 return pos ? NULL : im; 2912 } 2913 2914 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2915 __acquires(RCU) 2916 { 2917 rcu_read_lock(); 2918 return igmp6_mc_get_idx(seq, *pos); 2919 } 2920 2921 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2922 { 2923 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2924 2925 ++*pos; 2926 return im; 2927 } 2928 2929 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2930 __releases(RCU) 2931 { 2932 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2933 2934 if (likely(state->idev)) 2935 state->idev = NULL; 2936 state->dev = NULL; 2937 rcu_read_unlock(); 2938 } 2939 2940 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2941 { 2942 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2943 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2944 2945 seq_printf(seq, 2946 "%-4d %-15s %pi6 %5d %08X %ld\n", 2947 state->dev->ifindex, state->dev->name, 2948 &im->mca_addr, 2949 im->mca_users, im->mca_flags, 2950 (im->mca_flags & MAF_TIMER_RUNNING) ? 2951 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2952 return 0; 2953 } 2954 2955 static const struct seq_operations igmp6_mc_seq_ops = { 2956 .start = igmp6_mc_seq_start, 2957 .next = igmp6_mc_seq_next, 2958 .stop = igmp6_mc_seq_stop, 2959 .show = igmp6_mc_seq_show, 2960 }; 2961 2962 struct igmp6_mcf_iter_state { 2963 struct seq_net_private p; 2964 struct net_device *dev; 2965 struct inet6_dev *idev; 2966 struct ifmcaddr6 *im; 2967 }; 2968 2969 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2970 2971 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2972 { 2973 struct ip6_sf_list *psf = NULL; 2974 struct ifmcaddr6 *im = NULL; 2975 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2976 struct net *net = seq_file_net(seq); 2977 2978 state->idev = NULL; 2979 state->im = NULL; 2980 for_each_netdev_rcu(net, state->dev) { 2981 struct inet6_dev *idev; 2982 idev = __in6_dev_get(state->dev); 2983 if (unlikely(idev == NULL)) 2984 continue; 2985 2986 im = rcu_dereference(idev->mc_list); 2987 if (likely(im)) { 2988 psf = rcu_dereference(im->mca_sources); 2989 if (likely(psf)) { 2990 state->im = im; 2991 state->idev = idev; 2992 break; 2993 } 2994 } 2995 } 2996 return psf; 2997 } 2998 2999 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3000 { 3001 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3002 3003 psf = rcu_dereference(psf->sf_next); 3004 while (!psf) { 3005 state->im = rcu_dereference(state->im->next); 3006 while (!state->im) { 3007 state->dev = next_net_device_rcu(state->dev); 3008 if (!state->dev) { 3009 state->idev = NULL; 3010 goto out; 3011 } 3012 state->idev = __in6_dev_get(state->dev); 3013 if (!state->idev) 3014 continue; 3015 state->im = rcu_dereference(state->idev->mc_list); 3016 } 3017 psf = rcu_dereference(state->im->mca_sources); 3018 } 3019 out: 3020 return psf; 3021 } 3022 3023 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3024 { 3025 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3026 if (psf) 3027 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3028 --pos; 3029 return pos ? NULL : psf; 3030 } 3031 3032 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3033 __acquires(RCU) 3034 { 3035 rcu_read_lock(); 3036 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3037 } 3038 3039 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3040 { 3041 struct ip6_sf_list *psf; 3042 if (v == SEQ_START_TOKEN) 3043 psf = igmp6_mcf_get_first(seq); 3044 else 3045 psf = igmp6_mcf_get_next(seq, v); 3046 ++*pos; 3047 return psf; 3048 } 3049 3050 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3051 __releases(RCU) 3052 { 3053 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3054 3055 if (likely(state->im)) 3056 state->im = NULL; 3057 if (likely(state->idev)) 3058 state->idev = NULL; 3059 3060 state->dev = NULL; 3061 rcu_read_unlock(); 3062 } 3063 3064 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3065 { 3066 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3067 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3068 3069 if (v == SEQ_START_TOKEN) { 3070 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3071 } else { 3072 seq_printf(seq, 3073 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3074 state->dev->ifindex, state->dev->name, 3075 &state->im->mca_addr, 3076 &psf->sf_addr, 3077 psf->sf_count[MCAST_INCLUDE], 3078 psf->sf_count[MCAST_EXCLUDE]); 3079 } 3080 return 0; 3081 } 3082 3083 static const struct seq_operations igmp6_mcf_seq_ops = { 3084 .start = igmp6_mcf_seq_start, 3085 .next = igmp6_mcf_seq_next, 3086 .stop = igmp6_mcf_seq_stop, 3087 .show = igmp6_mcf_seq_show, 3088 }; 3089 3090 static int __net_init igmp6_proc_init(struct net *net) 3091 { 3092 int err; 3093 3094 err = -ENOMEM; 3095 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3096 sizeof(struct igmp6_mc_iter_state))) 3097 goto out; 3098 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3099 &igmp6_mcf_seq_ops, 3100 sizeof(struct igmp6_mcf_iter_state))) 3101 goto out_proc_net_igmp6; 3102 3103 err = 0; 3104 out: 3105 return err; 3106 3107 out_proc_net_igmp6: 3108 remove_proc_entry("igmp6", net->proc_net); 3109 goto out; 3110 } 3111 3112 static void __net_exit igmp6_proc_exit(struct net *net) 3113 { 3114 remove_proc_entry("mcfilter6", net->proc_net); 3115 remove_proc_entry("igmp6", net->proc_net); 3116 } 3117 #else 3118 static inline int igmp6_proc_init(struct net *net) 3119 { 3120 return 0; 3121 } 3122 static inline void igmp6_proc_exit(struct net *net) 3123 { 3124 } 3125 #endif 3126 3127 static int __net_init igmp6_net_init(struct net *net) 3128 { 3129 int err; 3130 3131 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3132 SOCK_RAW, IPPROTO_ICMPV6, net); 3133 if (err < 0) { 3134 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3135 err); 3136 goto out; 3137 } 3138 3139 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3140 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3141 3142 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3143 SOCK_RAW, IPPROTO_ICMPV6, net); 3144 if (err < 0) { 3145 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3146 err); 3147 goto out_sock_create; 3148 } 3149 3150 err = igmp6_proc_init(net); 3151 if (err) 3152 goto out_sock_create_autojoin; 3153 3154 return 0; 3155 3156 out_sock_create_autojoin: 3157 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3158 out_sock_create: 3159 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3160 out: 3161 return err; 3162 } 3163 3164 static void __net_exit igmp6_net_exit(struct net *net) 3165 { 3166 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3167 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3168 igmp6_proc_exit(net); 3169 } 3170 3171 static struct pernet_operations igmp6_net_ops = { 3172 .init = igmp6_net_init, 3173 .exit = igmp6_net_exit, 3174 }; 3175 3176 int __init igmp6_init(void) 3177 { 3178 int err; 3179 3180 err = register_pernet_subsys(&igmp6_net_ops); 3181 if (err) 3182 return err; 3183 3184 mld_wq = create_workqueue("mld"); 3185 if (!mld_wq) { 3186 unregister_pernet_subsys(&igmp6_net_ops); 3187 return -ENOMEM; 3188 } 3189 3190 return err; 3191 } 3192 3193 int __init igmp6_late_init(void) 3194 { 3195 return register_netdevice_notifier(&igmp6_netdev_notifier); 3196 } 3197 3198 void igmp6_cleanup(void) 3199 { 3200 unregister_pernet_subsys(&igmp6_net_ops); 3201 destroy_workqueue(mld_wq); 3202 } 3203 3204 void igmp6_late_cleanup(void) 3205 { 3206 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3207 } 3208