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/times.h> 33 #include <linux/net.h> 34 #include <linux/in.h> 35 #include <linux/in6.h> 36 #include <linux/netdevice.h> 37 #include <linux/if_arp.h> 38 #include <linux/route.h> 39 #include <linux/init.h> 40 #include <linux/proc_fs.h> 41 #include <linux/seq_file.h> 42 #include <linux/slab.h> 43 #include <linux/pkt_sched.h> 44 #include <net/mld.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 in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 71 72 static void igmp6_join_group(struct ifmcaddr6 *ma); 73 static void igmp6_leave_group(struct ifmcaddr6 *ma); 74 static void igmp6_timer_handler(struct timer_list *t); 75 76 static void mld_gq_timer_expire(struct timer_list *t); 77 static void mld_ifc_timer_expire(struct timer_list *t); 78 static void mld_ifc_event(struct inet6_dev *idev); 79 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 80 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 81 static void mld_clear_delrec(struct inet6_dev *idev); 82 static bool mld_in_v1_mode(const struct inet6_dev *idev); 83 static int sf_setstate(struct ifmcaddr6 *pmc); 84 static void sf_markstate(struct ifmcaddr6 *pmc); 85 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 86 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 87 int sfmode, int sfcount, const struct in6_addr *psfsrc, 88 int delta); 89 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 90 int sfmode, int sfcount, const struct in6_addr *psfsrc, 91 int delta); 92 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 93 struct inet6_dev *idev); 94 static int __ipv6_dev_mc_inc(struct net_device *dev, 95 const struct in6_addr *addr, unsigned int mode); 96 97 #define MLD_QRV_DEFAULT 2 98 /* RFC3810, 9.2. Query Interval */ 99 #define MLD_QI_DEFAULT (125 * HZ) 100 /* RFC3810, 9.3. Query Response Interval */ 101 #define MLD_QRI_DEFAULT (10 * HZ) 102 103 /* RFC3810, 8.1 Query Version Distinctions */ 104 #define MLD_V1_QUERY_LEN 24 105 #define MLD_V2_QUERY_LEN_MIN 28 106 107 #define IPV6_MLD_MAX_MSF 64 108 109 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 110 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; 111 112 /* 113 * socket join on multicast group 114 */ 115 116 #define for_each_pmc_rcu(np, pmc) \ 117 for (pmc = rcu_dereference(np->ipv6_mc_list); \ 118 pmc != NULL; \ 119 pmc = rcu_dereference(pmc->next)) 120 121 static int unsolicited_report_interval(struct inet6_dev *idev) 122 { 123 int iv; 124 125 if (mld_in_v1_mode(idev)) 126 iv = idev->cnf.mldv1_unsolicited_report_interval; 127 else 128 iv = idev->cnf.mldv2_unsolicited_report_interval; 129 130 return iv > 0 ? iv : 1; 131 } 132 133 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, 134 const struct in6_addr *addr, unsigned int mode) 135 { 136 struct net_device *dev = NULL; 137 struct ipv6_mc_socklist *mc_lst; 138 struct ipv6_pinfo *np = inet6_sk(sk); 139 struct net *net = sock_net(sk); 140 int err; 141 142 ASSERT_RTNL(); 143 144 if (!ipv6_addr_is_multicast(addr)) 145 return -EINVAL; 146 147 rcu_read_lock(); 148 for_each_pmc_rcu(np, mc_lst) { 149 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 150 ipv6_addr_equal(&mc_lst->addr, addr)) { 151 rcu_read_unlock(); 152 return -EADDRINUSE; 153 } 154 } 155 rcu_read_unlock(); 156 157 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 158 159 if (!mc_lst) 160 return -ENOMEM; 161 162 mc_lst->next = NULL; 163 mc_lst->addr = *addr; 164 165 if (ifindex == 0) { 166 struct rt6_info *rt; 167 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); 168 if (rt) { 169 dev = rt->dst.dev; 170 ip6_rt_put(rt); 171 } 172 } else 173 dev = __dev_get_by_index(net, ifindex); 174 175 if (!dev) { 176 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 177 return -ENODEV; 178 } 179 180 mc_lst->ifindex = dev->ifindex; 181 mc_lst->sfmode = mode; 182 rwlock_init(&mc_lst->sflock); 183 mc_lst->sflist = NULL; 184 185 /* 186 * now add/increase the group membership on the device 187 */ 188 189 err = __ipv6_dev_mc_inc(dev, addr, mode); 190 191 if (err) { 192 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 193 return err; 194 } 195 196 mc_lst->next = np->ipv6_mc_list; 197 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 198 199 return 0; 200 } 201 202 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 203 { 204 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 205 } 206 EXPORT_SYMBOL(ipv6_sock_mc_join); 207 208 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 209 const struct in6_addr *addr, unsigned int mode) 210 { 211 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 212 } 213 214 /* 215 * socket leave on multicast group 216 */ 217 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 218 { 219 struct ipv6_pinfo *np = inet6_sk(sk); 220 struct ipv6_mc_socklist *mc_lst; 221 struct ipv6_mc_socklist __rcu **lnk; 222 struct net *net = sock_net(sk); 223 224 ASSERT_RTNL(); 225 226 if (!ipv6_addr_is_multicast(addr)) 227 return -EINVAL; 228 229 for (lnk = &np->ipv6_mc_list; 230 (mc_lst = rtnl_dereference(*lnk)) != NULL; 231 lnk = &mc_lst->next) { 232 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 233 ipv6_addr_equal(&mc_lst->addr, addr)) { 234 struct net_device *dev; 235 236 *lnk = mc_lst->next; 237 238 dev = __dev_get_by_index(net, mc_lst->ifindex); 239 if (dev) { 240 struct inet6_dev *idev = __in6_dev_get(dev); 241 242 (void) ip6_mc_leave_src(sk, mc_lst, idev); 243 if (idev) 244 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 245 } else 246 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 247 248 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 249 kfree_rcu(mc_lst, rcu); 250 return 0; 251 } 252 } 253 254 return -EADDRNOTAVAIL; 255 } 256 EXPORT_SYMBOL(ipv6_sock_mc_drop); 257 258 /* called with rcu_read_lock() */ 259 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 260 const struct in6_addr *group, 261 int ifindex) 262 { 263 struct net_device *dev = NULL; 264 struct inet6_dev *idev = NULL; 265 266 if (ifindex == 0) { 267 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0); 268 269 if (rt) { 270 dev = rt->dst.dev; 271 ip6_rt_put(rt); 272 } 273 } else 274 dev = dev_get_by_index_rcu(net, ifindex); 275 276 if (!dev) 277 return NULL; 278 idev = __in6_dev_get(dev); 279 if (!idev) 280 return NULL; 281 read_lock_bh(&idev->lock); 282 if (idev->dead) { 283 read_unlock_bh(&idev->lock); 284 return NULL; 285 } 286 return idev; 287 } 288 289 void __ipv6_sock_mc_close(struct sock *sk) 290 { 291 struct ipv6_pinfo *np = inet6_sk(sk); 292 struct ipv6_mc_socklist *mc_lst; 293 struct net *net = sock_net(sk); 294 295 ASSERT_RTNL(); 296 297 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) { 298 struct net_device *dev; 299 300 np->ipv6_mc_list = mc_lst->next; 301 302 dev = __dev_get_by_index(net, mc_lst->ifindex); 303 if (dev) { 304 struct inet6_dev *idev = __in6_dev_get(dev); 305 306 (void) ip6_mc_leave_src(sk, mc_lst, idev); 307 if (idev) 308 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 309 } else 310 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 311 312 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 313 kfree_rcu(mc_lst, rcu); 314 } 315 } 316 317 void ipv6_sock_mc_close(struct sock *sk) 318 { 319 struct ipv6_pinfo *np = inet6_sk(sk); 320 321 if (!rcu_access_pointer(np->ipv6_mc_list)) 322 return; 323 rtnl_lock(); 324 __ipv6_sock_mc_close(sk); 325 rtnl_unlock(); 326 } 327 328 int ip6_mc_source(int add, int omode, struct sock *sk, 329 struct group_source_req *pgsr) 330 { 331 struct in6_addr *source, *group; 332 struct ipv6_mc_socklist *pmc; 333 struct inet6_dev *idev; 334 struct ipv6_pinfo *inet6 = inet6_sk(sk); 335 struct ip6_sf_socklist *psl; 336 struct net *net = sock_net(sk); 337 int i, j, rv; 338 int leavegroup = 0; 339 int pmclocked = 0; 340 int err; 341 342 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 343 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 344 345 if (!ipv6_addr_is_multicast(group)) 346 return -EINVAL; 347 348 rcu_read_lock(); 349 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 350 if (!idev) { 351 rcu_read_unlock(); 352 return -ENODEV; 353 } 354 355 err = -EADDRNOTAVAIL; 356 357 for_each_pmc_rcu(inet6, pmc) { 358 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 359 continue; 360 if (ipv6_addr_equal(&pmc->addr, group)) 361 break; 362 } 363 if (!pmc) { /* must have a prior join */ 364 err = -EINVAL; 365 goto done; 366 } 367 /* if a source filter was set, must be the same mode as before */ 368 if (pmc->sflist) { 369 if (pmc->sfmode != omode) { 370 err = -EINVAL; 371 goto done; 372 } 373 } else if (pmc->sfmode != omode) { 374 /* allow mode switches for empty-set filters */ 375 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 376 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 377 pmc->sfmode = omode; 378 } 379 380 write_lock(&pmc->sflock); 381 pmclocked = 1; 382 383 psl = pmc->sflist; 384 if (!add) { 385 if (!psl) 386 goto done; /* err = -EADDRNOTAVAIL */ 387 rv = !0; 388 for (i = 0; i < psl->sl_count; i++) { 389 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 390 if (rv == 0) 391 break; 392 } 393 if (rv) /* source not found */ 394 goto done; /* err = -EADDRNOTAVAIL */ 395 396 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 397 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 398 leavegroup = 1; 399 goto done; 400 } 401 402 /* update the interface filter */ 403 ip6_mc_del_src(idev, group, omode, 1, source, 1); 404 405 for (j = i+1; j < psl->sl_count; j++) 406 psl->sl_addr[j-1] = psl->sl_addr[j]; 407 psl->sl_count--; 408 err = 0; 409 goto done; 410 } 411 /* else, add a new source to the filter */ 412 413 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 414 err = -ENOBUFS; 415 goto done; 416 } 417 if (!psl || psl->sl_count == psl->sl_max) { 418 struct ip6_sf_socklist *newpsl; 419 int count = IP6_SFBLOCK; 420 421 if (psl) 422 count += psl->sl_max; 423 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 424 if (!newpsl) { 425 err = -ENOBUFS; 426 goto done; 427 } 428 newpsl->sl_max = count; 429 newpsl->sl_count = count - IP6_SFBLOCK; 430 if (psl) { 431 for (i = 0; i < psl->sl_count; i++) 432 newpsl->sl_addr[i] = psl->sl_addr[i]; 433 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 434 } 435 pmc->sflist = psl = newpsl; 436 } 437 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 438 for (i = 0; i < psl->sl_count; i++) { 439 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 440 if (rv == 0) /* There is an error in the address. */ 441 goto done; 442 } 443 for (j = psl->sl_count-1; j >= i; j--) 444 psl->sl_addr[j+1] = psl->sl_addr[j]; 445 psl->sl_addr[i] = *source; 446 psl->sl_count++; 447 err = 0; 448 /* update the interface list */ 449 ip6_mc_add_src(idev, group, omode, 1, source, 1); 450 done: 451 if (pmclocked) 452 write_unlock(&pmc->sflock); 453 read_unlock_bh(&idev->lock); 454 rcu_read_unlock(); 455 if (leavegroup) 456 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 457 return err; 458 } 459 460 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 461 { 462 const struct in6_addr *group; 463 struct ipv6_mc_socklist *pmc; 464 struct inet6_dev *idev; 465 struct ipv6_pinfo *inet6 = inet6_sk(sk); 466 struct ip6_sf_socklist *newpsl, *psl; 467 struct net *net = sock_net(sk); 468 int leavegroup = 0; 469 int i, err; 470 471 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 472 473 if (!ipv6_addr_is_multicast(group)) 474 return -EINVAL; 475 if (gsf->gf_fmode != MCAST_INCLUDE && 476 gsf->gf_fmode != MCAST_EXCLUDE) 477 return -EINVAL; 478 479 rcu_read_lock(); 480 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 481 482 if (!idev) { 483 rcu_read_unlock(); 484 return -ENODEV; 485 } 486 487 err = 0; 488 489 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 490 leavegroup = 1; 491 goto done; 492 } 493 494 for_each_pmc_rcu(inet6, pmc) { 495 if (pmc->ifindex != gsf->gf_interface) 496 continue; 497 if (ipv6_addr_equal(&pmc->addr, group)) 498 break; 499 } 500 if (!pmc) { /* must have a prior join */ 501 err = -EINVAL; 502 goto done; 503 } 504 if (gsf->gf_numsrc) { 505 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 506 GFP_ATOMIC); 507 if (!newpsl) { 508 err = -ENOBUFS; 509 goto done; 510 } 511 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 512 for (i = 0; i < newpsl->sl_count; ++i) { 513 struct sockaddr_in6 *psin6; 514 515 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 516 newpsl->sl_addr[i] = psin6->sin6_addr; 517 } 518 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 519 newpsl->sl_count, newpsl->sl_addr, 0); 520 if (err) { 521 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 522 goto done; 523 } 524 } else { 525 newpsl = NULL; 526 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 527 } 528 529 write_lock(&pmc->sflock); 530 psl = pmc->sflist; 531 if (psl) { 532 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 533 psl->sl_count, psl->sl_addr, 0); 534 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 535 } else 536 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 537 pmc->sflist = newpsl; 538 pmc->sfmode = gsf->gf_fmode; 539 write_unlock(&pmc->sflock); 540 err = 0; 541 done: 542 read_unlock_bh(&idev->lock); 543 rcu_read_unlock(); 544 if (leavegroup) 545 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 546 return err; 547 } 548 549 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 550 struct group_filter __user *optval, int __user *optlen) 551 { 552 int err, i, count, copycount; 553 const struct in6_addr *group; 554 struct ipv6_mc_socklist *pmc; 555 struct inet6_dev *idev; 556 struct ipv6_pinfo *inet6 = inet6_sk(sk); 557 struct ip6_sf_socklist *psl; 558 struct net *net = sock_net(sk); 559 560 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 561 562 if (!ipv6_addr_is_multicast(group)) 563 return -EINVAL; 564 565 rcu_read_lock(); 566 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 567 568 if (!idev) { 569 rcu_read_unlock(); 570 return -ENODEV; 571 } 572 573 err = -EADDRNOTAVAIL; 574 /* changes to the ipv6_mc_list require the socket lock and 575 * rtnl lock. We have the socket lock and rcu read lock, 576 * so reading the list is safe. 577 */ 578 579 for_each_pmc_rcu(inet6, pmc) { 580 if (pmc->ifindex != gsf->gf_interface) 581 continue; 582 if (ipv6_addr_equal(group, &pmc->addr)) 583 break; 584 } 585 if (!pmc) /* must have a prior join */ 586 goto done; 587 gsf->gf_fmode = pmc->sfmode; 588 psl = pmc->sflist; 589 count = psl ? psl->sl_count : 0; 590 read_unlock_bh(&idev->lock); 591 rcu_read_unlock(); 592 593 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 594 gsf->gf_numsrc = count; 595 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 596 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 597 return -EFAULT; 598 } 599 /* changes to psl require the socket lock, and a write lock 600 * on pmc->sflock. We have the socket lock so reading here is safe. 601 */ 602 for (i = 0; i < copycount; i++) { 603 struct sockaddr_in6 *psin6; 604 struct sockaddr_storage ss; 605 606 psin6 = (struct sockaddr_in6 *)&ss; 607 memset(&ss, 0, sizeof(ss)); 608 psin6->sin6_family = AF_INET6; 609 psin6->sin6_addr = psl->sl_addr[i]; 610 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 611 return -EFAULT; 612 } 613 return 0; 614 done: 615 read_unlock_bh(&idev->lock); 616 rcu_read_unlock(); 617 return err; 618 } 619 620 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 621 const struct in6_addr *src_addr) 622 { 623 struct ipv6_pinfo *np = inet6_sk(sk); 624 struct ipv6_mc_socklist *mc; 625 struct ip6_sf_socklist *psl; 626 bool rv = true; 627 628 rcu_read_lock(); 629 for_each_pmc_rcu(np, mc) { 630 if (ipv6_addr_equal(&mc->addr, mc_addr)) 631 break; 632 } 633 if (!mc) { 634 rcu_read_unlock(); 635 return np->mc_all; 636 } 637 read_lock(&mc->sflock); 638 psl = mc->sflist; 639 if (!psl) { 640 rv = mc->sfmode == MCAST_EXCLUDE; 641 } else { 642 int i; 643 644 for (i = 0; i < psl->sl_count; i++) { 645 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 646 break; 647 } 648 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 649 rv = false; 650 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 651 rv = false; 652 } 653 read_unlock(&mc->sflock); 654 rcu_read_unlock(); 655 656 return rv; 657 } 658 659 static void igmp6_group_added(struct ifmcaddr6 *mc) 660 { 661 struct net_device *dev = mc->idev->dev; 662 char buf[MAX_ADDR_LEN]; 663 664 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 665 IPV6_ADDR_SCOPE_LINKLOCAL) 666 return; 667 668 spin_lock_bh(&mc->mca_lock); 669 if (!(mc->mca_flags&MAF_LOADED)) { 670 mc->mca_flags |= MAF_LOADED; 671 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 672 dev_mc_add(dev, buf); 673 } 674 spin_unlock_bh(&mc->mca_lock); 675 676 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 677 return; 678 679 if (mld_in_v1_mode(mc->idev)) { 680 igmp6_join_group(mc); 681 return; 682 } 683 /* else v2 */ 684 685 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 686 * should not send filter-mode change record as the mode 687 * should be from IN() to IN(A). 688 */ 689 if (mc->mca_sfmode == MCAST_EXCLUDE) 690 mc->mca_crcount = mc->idev->mc_qrv; 691 692 mld_ifc_event(mc->idev); 693 } 694 695 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 696 { 697 struct net_device *dev = mc->idev->dev; 698 char buf[MAX_ADDR_LEN]; 699 700 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 701 IPV6_ADDR_SCOPE_LINKLOCAL) 702 return; 703 704 spin_lock_bh(&mc->mca_lock); 705 if (mc->mca_flags&MAF_LOADED) { 706 mc->mca_flags &= ~MAF_LOADED; 707 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 708 dev_mc_del(dev, buf); 709 } 710 711 spin_unlock_bh(&mc->mca_lock); 712 if (mc->mca_flags & MAF_NOREPORT) 713 return; 714 715 if (!mc->idev->dead) 716 igmp6_leave_group(mc); 717 718 spin_lock_bh(&mc->mca_lock); 719 if (del_timer(&mc->mca_timer)) 720 refcount_dec(&mc->mca_refcnt); 721 spin_unlock_bh(&mc->mca_lock); 722 } 723 724 /* 725 * deleted ifmcaddr6 manipulation 726 */ 727 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 728 { 729 struct ifmcaddr6 *pmc; 730 731 /* this is an "ifmcaddr6" for convenience; only the fields below 732 * are actually used. In particular, the refcnt and users are not 733 * used for management of the delete list. Using the same structure 734 * for deleted items allows change reports to use common code with 735 * non-deleted or query-response MCA's. 736 */ 737 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 738 if (!pmc) 739 return; 740 741 spin_lock_bh(&im->mca_lock); 742 spin_lock_init(&pmc->mca_lock); 743 pmc->idev = im->idev; 744 in6_dev_hold(idev); 745 pmc->mca_addr = im->mca_addr; 746 pmc->mca_crcount = idev->mc_qrv; 747 pmc->mca_sfmode = im->mca_sfmode; 748 if (pmc->mca_sfmode == MCAST_INCLUDE) { 749 struct ip6_sf_list *psf; 750 751 pmc->mca_tomb = im->mca_tomb; 752 pmc->mca_sources = im->mca_sources; 753 im->mca_tomb = im->mca_sources = NULL; 754 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 755 psf->sf_crcount = pmc->mca_crcount; 756 } 757 spin_unlock_bh(&im->mca_lock); 758 759 spin_lock_bh(&idev->mc_lock); 760 pmc->next = idev->mc_tomb; 761 idev->mc_tomb = pmc; 762 spin_unlock_bh(&idev->mc_lock); 763 } 764 765 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 766 { 767 struct ifmcaddr6 *pmc, *pmc_prev; 768 struct ip6_sf_list *psf; 769 struct in6_addr *pmca = &im->mca_addr; 770 771 spin_lock_bh(&idev->mc_lock); 772 pmc_prev = NULL; 773 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) { 774 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 775 break; 776 pmc_prev = pmc; 777 } 778 if (pmc) { 779 if (pmc_prev) 780 pmc_prev->next = pmc->next; 781 else 782 idev->mc_tomb = pmc->next; 783 } 784 spin_unlock_bh(&idev->mc_lock); 785 786 spin_lock_bh(&im->mca_lock); 787 if (pmc) { 788 im->idev = pmc->idev; 789 if (im->mca_sfmode == MCAST_INCLUDE) { 790 im->mca_tomb = pmc->mca_tomb; 791 im->mca_sources = pmc->mca_sources; 792 for (psf = im->mca_sources; psf; psf = psf->sf_next) 793 psf->sf_crcount = idev->mc_qrv; 794 } else { 795 im->mca_crcount = idev->mc_qrv; 796 } 797 in6_dev_put(pmc->idev); 798 kfree(pmc); 799 } 800 spin_unlock_bh(&im->mca_lock); 801 } 802 803 static void mld_clear_delrec(struct inet6_dev *idev) 804 { 805 struct ifmcaddr6 *pmc, *nextpmc; 806 807 spin_lock_bh(&idev->mc_lock); 808 pmc = idev->mc_tomb; 809 idev->mc_tomb = NULL; 810 spin_unlock_bh(&idev->mc_lock); 811 812 for (; pmc; pmc = nextpmc) { 813 nextpmc = pmc->next; 814 ip6_mc_clear_src(pmc); 815 in6_dev_put(pmc->idev); 816 kfree(pmc); 817 } 818 819 /* clear dead sources, too */ 820 read_lock_bh(&idev->lock); 821 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 822 struct ip6_sf_list *psf, *psf_next; 823 824 spin_lock_bh(&pmc->mca_lock); 825 psf = pmc->mca_tomb; 826 pmc->mca_tomb = NULL; 827 spin_unlock_bh(&pmc->mca_lock); 828 for (; psf; psf = psf_next) { 829 psf_next = psf->sf_next; 830 kfree(psf); 831 } 832 } 833 read_unlock_bh(&idev->lock); 834 } 835 836 static void mca_get(struct ifmcaddr6 *mc) 837 { 838 refcount_inc(&mc->mca_refcnt); 839 } 840 841 static void ma_put(struct ifmcaddr6 *mc) 842 { 843 if (refcount_dec_and_test(&mc->mca_refcnt)) { 844 in6_dev_put(mc->idev); 845 kfree(mc); 846 } 847 } 848 849 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 850 const struct in6_addr *addr, 851 unsigned int mode) 852 { 853 struct ifmcaddr6 *mc; 854 855 mc = kzalloc(sizeof(*mc), GFP_ATOMIC); 856 if (!mc) 857 return NULL; 858 859 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0); 860 861 mc->mca_addr = *addr; 862 mc->idev = idev; /* reference taken by caller */ 863 mc->mca_users = 1; 864 /* mca_stamp should be updated upon changes */ 865 mc->mca_cstamp = mc->mca_tstamp = jiffies; 866 refcount_set(&mc->mca_refcnt, 1); 867 spin_lock_init(&mc->mca_lock); 868 869 mc->mca_sfmode = mode; 870 mc->mca_sfcount[mode] = 1; 871 872 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 873 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 874 mc->mca_flags |= MAF_NOREPORT; 875 876 return mc; 877 } 878 879 /* 880 * device multicast group inc (add if not found) 881 */ 882 static int __ipv6_dev_mc_inc(struct net_device *dev, 883 const struct in6_addr *addr, unsigned int mode) 884 { 885 struct ifmcaddr6 *mc; 886 struct inet6_dev *idev; 887 888 ASSERT_RTNL(); 889 890 /* we need to take a reference on idev */ 891 idev = in6_dev_get(dev); 892 893 if (!idev) 894 return -EINVAL; 895 896 write_lock_bh(&idev->lock); 897 if (idev->dead) { 898 write_unlock_bh(&idev->lock); 899 in6_dev_put(idev); 900 return -ENODEV; 901 } 902 903 for (mc = idev->mc_list; mc; mc = mc->next) { 904 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 905 mc->mca_users++; 906 write_unlock_bh(&idev->lock); 907 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 908 in6_dev_put(idev); 909 return 0; 910 } 911 } 912 913 mc = mca_alloc(idev, addr, mode); 914 if (!mc) { 915 write_unlock_bh(&idev->lock); 916 in6_dev_put(idev); 917 return -ENOMEM; 918 } 919 920 mc->next = idev->mc_list; 921 idev->mc_list = mc; 922 923 /* Hold this for the code below before we unlock, 924 * it is already exposed via idev->mc_list. 925 */ 926 mca_get(mc); 927 write_unlock_bh(&idev->lock); 928 929 mld_del_delrec(idev, mc); 930 igmp6_group_added(mc); 931 ma_put(mc); 932 return 0; 933 } 934 935 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 936 { 937 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 938 } 939 EXPORT_SYMBOL(ipv6_dev_mc_inc); 940 941 /* 942 * device multicast group del 943 */ 944 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 945 { 946 struct ifmcaddr6 *ma, **map; 947 948 ASSERT_RTNL(); 949 950 write_lock_bh(&idev->lock); 951 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) { 952 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 953 if (--ma->mca_users == 0) { 954 *map = ma->next; 955 write_unlock_bh(&idev->lock); 956 957 igmp6_group_dropped(ma); 958 ip6_mc_clear_src(ma); 959 960 ma_put(ma); 961 return 0; 962 } 963 write_unlock_bh(&idev->lock); 964 return 0; 965 } 966 } 967 write_unlock_bh(&idev->lock); 968 969 return -ENOENT; 970 } 971 972 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 973 { 974 struct inet6_dev *idev; 975 int err; 976 977 ASSERT_RTNL(); 978 979 idev = __in6_dev_get(dev); 980 if (!idev) 981 err = -ENODEV; 982 else 983 err = __ipv6_dev_mc_dec(idev, addr); 984 985 return err; 986 } 987 EXPORT_SYMBOL(ipv6_dev_mc_dec); 988 989 /* 990 * check if the interface/address pair is valid 991 */ 992 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 993 const struct in6_addr *src_addr) 994 { 995 struct inet6_dev *idev; 996 struct ifmcaddr6 *mc; 997 bool rv = false; 998 999 rcu_read_lock(); 1000 idev = __in6_dev_get(dev); 1001 if (idev) { 1002 read_lock_bh(&idev->lock); 1003 for (mc = idev->mc_list; mc; mc = mc->next) { 1004 if (ipv6_addr_equal(&mc->mca_addr, group)) 1005 break; 1006 } 1007 if (mc) { 1008 if (src_addr && !ipv6_addr_any(src_addr)) { 1009 struct ip6_sf_list *psf; 1010 1011 spin_lock_bh(&mc->mca_lock); 1012 for (psf = mc->mca_sources; psf; psf = psf->sf_next) { 1013 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1014 break; 1015 } 1016 if (psf) 1017 rv = psf->sf_count[MCAST_INCLUDE] || 1018 psf->sf_count[MCAST_EXCLUDE] != 1019 mc->mca_sfcount[MCAST_EXCLUDE]; 1020 else 1021 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; 1022 spin_unlock_bh(&mc->mca_lock); 1023 } else 1024 rv = true; /* don't filter unspecified source */ 1025 } 1026 read_unlock_bh(&idev->lock); 1027 } 1028 rcu_read_unlock(); 1029 return rv; 1030 } 1031 1032 static void mld_gq_start_timer(struct inet6_dev *idev) 1033 { 1034 unsigned long tv = prandom_u32() % idev->mc_maxdelay; 1035 1036 idev->mc_gq_running = 1; 1037 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1038 in6_dev_hold(idev); 1039 } 1040 1041 static void mld_gq_stop_timer(struct inet6_dev *idev) 1042 { 1043 idev->mc_gq_running = 0; 1044 if (del_timer(&idev->mc_gq_timer)) 1045 __in6_dev_put(idev); 1046 } 1047 1048 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) 1049 { 1050 unsigned long tv = prandom_u32() % delay; 1051 1052 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1053 in6_dev_hold(idev); 1054 } 1055 1056 static void mld_ifc_stop_timer(struct inet6_dev *idev) 1057 { 1058 idev->mc_ifc_count = 0; 1059 if (del_timer(&idev->mc_ifc_timer)) 1060 __in6_dev_put(idev); 1061 } 1062 1063 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) 1064 { 1065 unsigned long tv = prandom_u32() % delay; 1066 1067 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) 1068 in6_dev_hold(idev); 1069 } 1070 1071 static void mld_dad_stop_timer(struct inet6_dev *idev) 1072 { 1073 if (del_timer(&idev->mc_dad_timer)) 1074 __in6_dev_put(idev); 1075 } 1076 1077 /* 1078 * IGMP handling (alias multicast ICMPv6 messages) 1079 */ 1080 1081 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1082 { 1083 unsigned long delay = resptime; 1084 1085 /* Do not start timer for these addresses */ 1086 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1087 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1088 return; 1089 1090 if (del_timer(&ma->mca_timer)) { 1091 refcount_dec(&ma->mca_refcnt); 1092 delay = ma->mca_timer.expires - jiffies; 1093 } 1094 1095 if (delay >= resptime) 1096 delay = prandom_u32() % resptime; 1097 1098 ma->mca_timer.expires = jiffies + delay; 1099 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1100 refcount_inc(&ma->mca_refcnt); 1101 ma->mca_flags |= MAF_TIMER_RUNNING; 1102 } 1103 1104 /* mark EXCLUDE-mode sources */ 1105 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1106 const struct in6_addr *srcs) 1107 { 1108 struct ip6_sf_list *psf; 1109 int i, scount; 1110 1111 scount = 0; 1112 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1113 if (scount == nsrcs) 1114 break; 1115 for (i = 0; i < nsrcs; i++) { 1116 /* skip inactive filters */ 1117 if (psf->sf_count[MCAST_INCLUDE] || 1118 pmc->mca_sfcount[MCAST_EXCLUDE] != 1119 psf->sf_count[MCAST_EXCLUDE]) 1120 break; 1121 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1122 scount++; 1123 break; 1124 } 1125 } 1126 } 1127 pmc->mca_flags &= ~MAF_GSQUERY; 1128 if (scount == nsrcs) /* all sources excluded */ 1129 return false; 1130 return true; 1131 } 1132 1133 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1134 const struct in6_addr *srcs) 1135 { 1136 struct ip6_sf_list *psf; 1137 int i, scount; 1138 1139 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1140 return mld_xmarksources(pmc, nsrcs, srcs); 1141 1142 /* mark INCLUDE-mode sources */ 1143 1144 scount = 0; 1145 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1146 if (scount == nsrcs) 1147 break; 1148 for (i = 0; i < nsrcs; i++) { 1149 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1150 psf->sf_gsresp = 1; 1151 scount++; 1152 break; 1153 } 1154 } 1155 } 1156 if (!scount) { 1157 pmc->mca_flags &= ~MAF_GSQUERY; 1158 return false; 1159 } 1160 pmc->mca_flags |= MAF_GSQUERY; 1161 return true; 1162 } 1163 1164 static int mld_force_mld_version(const struct inet6_dev *idev) 1165 { 1166 /* Normally, both are 0 here. If enforcement to a particular is 1167 * being used, individual device enforcement will have a lower 1168 * precedence over 'all' device (.../conf/all/force_mld_version). 1169 */ 1170 1171 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1172 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1173 else 1174 return idev->cnf.force_mld_version; 1175 } 1176 1177 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1178 { 1179 return mld_force_mld_version(idev) == 2; 1180 } 1181 1182 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1183 { 1184 return mld_force_mld_version(idev) == 1; 1185 } 1186 1187 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1188 { 1189 if (mld_in_v2_mode_only(idev)) 1190 return false; 1191 if (mld_in_v1_mode_only(idev)) 1192 return true; 1193 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1194 return true; 1195 1196 return false; 1197 } 1198 1199 static void mld_set_v1_mode(struct inet6_dev *idev) 1200 { 1201 /* RFC3810, relevant sections: 1202 * - 9.1. Robustness Variable 1203 * - 9.2. Query Interval 1204 * - 9.3. Query Response Interval 1205 * - 9.12. Older Version Querier Present Timeout 1206 */ 1207 unsigned long switchback; 1208 1209 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1210 1211 idev->mc_v1_seen = jiffies + switchback; 1212 } 1213 1214 static void mld_update_qrv(struct inet6_dev *idev, 1215 const struct mld2_query *mlh2) 1216 { 1217 /* RFC3810, relevant sections: 1218 * - 5.1.8. QRV (Querier's Robustness Variable) 1219 * - 9.1. Robustness Variable 1220 */ 1221 1222 /* The value of the Robustness Variable MUST NOT be zero, 1223 * and SHOULD NOT be one. Catch this here if we ever run 1224 * into such a case in future. 1225 */ 1226 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1227 WARN_ON(idev->mc_qrv == 0); 1228 1229 if (mlh2->mld2q_qrv > 0) 1230 idev->mc_qrv = mlh2->mld2q_qrv; 1231 1232 if (unlikely(idev->mc_qrv < min_qrv)) { 1233 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1234 idev->mc_qrv, min_qrv); 1235 idev->mc_qrv = min_qrv; 1236 } 1237 } 1238 1239 static void mld_update_qi(struct inet6_dev *idev, 1240 const struct mld2_query *mlh2) 1241 { 1242 /* RFC3810, relevant sections: 1243 * - 5.1.9. QQIC (Querier's Query Interval Code) 1244 * - 9.2. Query Interval 1245 * - 9.12. Older Version Querier Present Timeout 1246 * (the [Query Interval] in the last Query received) 1247 */ 1248 unsigned long mc_qqi; 1249 1250 if (mlh2->mld2q_qqic < 128) { 1251 mc_qqi = mlh2->mld2q_qqic; 1252 } else { 1253 unsigned long mc_man, mc_exp; 1254 1255 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1256 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1257 1258 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1259 } 1260 1261 idev->mc_qi = mc_qqi * HZ; 1262 } 1263 1264 static void mld_update_qri(struct inet6_dev *idev, 1265 const struct mld2_query *mlh2) 1266 { 1267 /* RFC3810, relevant sections: 1268 * - 5.1.3. Maximum Response Code 1269 * - 9.3. Query Response Interval 1270 */ 1271 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1272 } 1273 1274 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1275 unsigned long *max_delay, bool v1_query) 1276 { 1277 unsigned long mldv1_md; 1278 1279 /* Ignore v1 queries */ 1280 if (mld_in_v2_mode_only(idev)) 1281 return -EINVAL; 1282 1283 mldv1_md = ntohs(mld->mld_maxdelay); 1284 1285 /* When in MLDv1 fallback and a MLDv2 router start-up being 1286 * unaware of current MLDv1 operation, the MRC == MRD mapping 1287 * only works when the exponential algorithm is not being 1288 * used (as MLDv1 is unaware of such things). 1289 * 1290 * According to the RFC author, the MLDv2 implementations 1291 * he's aware of all use a MRC < 32768 on start up queries. 1292 * 1293 * Thus, should we *ever* encounter something else larger 1294 * than that, just assume the maximum possible within our 1295 * reach. 1296 */ 1297 if (!v1_query) 1298 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1299 1300 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1301 1302 /* MLDv1 router present: we need to go into v1 mode *only* 1303 * when an MLDv1 query is received as per section 9.12. of 1304 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1305 * queries MUST be of exactly 24 octets. 1306 */ 1307 if (v1_query) 1308 mld_set_v1_mode(idev); 1309 1310 /* cancel MLDv2 report timer */ 1311 mld_gq_stop_timer(idev); 1312 /* cancel the interface change timer */ 1313 mld_ifc_stop_timer(idev); 1314 /* clear deleted report items */ 1315 mld_clear_delrec(idev); 1316 1317 return 0; 1318 } 1319 1320 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1321 unsigned long *max_delay) 1322 { 1323 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1324 1325 mld_update_qrv(idev, mld); 1326 mld_update_qi(idev, mld); 1327 mld_update_qri(idev, mld); 1328 1329 idev->mc_maxdelay = *max_delay; 1330 1331 return 0; 1332 } 1333 1334 /* called with rcu_read_lock() */ 1335 int igmp6_event_query(struct sk_buff *skb) 1336 { 1337 struct mld2_query *mlh2 = NULL; 1338 struct ifmcaddr6 *ma; 1339 const struct in6_addr *group; 1340 unsigned long max_delay; 1341 struct inet6_dev *idev; 1342 struct mld_msg *mld; 1343 int group_type; 1344 int mark = 0; 1345 int len, err; 1346 1347 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1348 return -EINVAL; 1349 1350 /* compute payload length excluding extension headers */ 1351 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1352 len -= skb_network_header_len(skb); 1353 1354 /* RFC3810 6.2 1355 * Upon reception of an MLD message that contains a Query, the node 1356 * checks if the source address of the message is a valid link-local 1357 * address, if the Hop Limit is set to 1, and if the Router Alert 1358 * option is present in the Hop-By-Hop Options header of the IPv6 1359 * packet. If any of these checks fails, the packet is dropped. 1360 */ 1361 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1362 ipv6_hdr(skb)->hop_limit != 1 || 1363 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1364 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1365 return -EINVAL; 1366 1367 idev = __in6_dev_get(skb->dev); 1368 if (!idev) 1369 return 0; 1370 1371 mld = (struct mld_msg *)icmp6_hdr(skb); 1372 group = &mld->mld_mca; 1373 group_type = ipv6_addr_type(group); 1374 1375 if (group_type != IPV6_ADDR_ANY && 1376 !(group_type&IPV6_ADDR_MULTICAST)) 1377 return -EINVAL; 1378 1379 if (len < MLD_V1_QUERY_LEN) { 1380 return -EINVAL; 1381 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1382 err = mld_process_v1(idev, mld, &max_delay, 1383 len == MLD_V1_QUERY_LEN); 1384 if (err < 0) 1385 return err; 1386 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1387 int srcs_offset = sizeof(struct mld2_query) - 1388 sizeof(struct icmp6hdr); 1389 1390 if (!pskb_may_pull(skb, srcs_offset)) 1391 return -EINVAL; 1392 1393 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1394 1395 err = mld_process_v2(idev, mlh2, &max_delay); 1396 if (err < 0) 1397 return err; 1398 1399 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1400 if (mlh2->mld2q_nsrcs) 1401 return -EINVAL; /* no sources allowed */ 1402 1403 mld_gq_start_timer(idev); 1404 return 0; 1405 } 1406 /* mark sources to include, if group & source-specific */ 1407 if (mlh2->mld2q_nsrcs != 0) { 1408 if (!pskb_may_pull(skb, srcs_offset + 1409 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1410 return -EINVAL; 1411 1412 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1413 mark = 1; 1414 } 1415 } else { 1416 return -EINVAL; 1417 } 1418 1419 read_lock_bh(&idev->lock); 1420 if (group_type == IPV6_ADDR_ANY) { 1421 for (ma = idev->mc_list; ma; ma = ma->next) { 1422 spin_lock_bh(&ma->mca_lock); 1423 igmp6_group_queried(ma, max_delay); 1424 spin_unlock_bh(&ma->mca_lock); 1425 } 1426 } else { 1427 for (ma = idev->mc_list; ma; ma = ma->next) { 1428 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1429 continue; 1430 spin_lock_bh(&ma->mca_lock); 1431 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1432 /* gsquery <- gsquery && mark */ 1433 if (!mark) 1434 ma->mca_flags &= ~MAF_GSQUERY; 1435 } else { 1436 /* gsquery <- mark */ 1437 if (mark) 1438 ma->mca_flags |= MAF_GSQUERY; 1439 else 1440 ma->mca_flags &= ~MAF_GSQUERY; 1441 } 1442 if (!(ma->mca_flags & MAF_GSQUERY) || 1443 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1444 igmp6_group_queried(ma, max_delay); 1445 spin_unlock_bh(&ma->mca_lock); 1446 break; 1447 } 1448 } 1449 read_unlock_bh(&idev->lock); 1450 1451 return 0; 1452 } 1453 1454 /* called with rcu_read_lock() */ 1455 int igmp6_event_report(struct sk_buff *skb) 1456 { 1457 struct ifmcaddr6 *ma; 1458 struct inet6_dev *idev; 1459 struct mld_msg *mld; 1460 int addr_type; 1461 1462 /* Our own report looped back. Ignore it. */ 1463 if (skb->pkt_type == PACKET_LOOPBACK) 1464 return 0; 1465 1466 /* send our report if the MC router may not have heard this report */ 1467 if (skb->pkt_type != PACKET_MULTICAST && 1468 skb->pkt_type != PACKET_BROADCAST) 1469 return 0; 1470 1471 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1472 return -EINVAL; 1473 1474 mld = (struct mld_msg *)icmp6_hdr(skb); 1475 1476 /* Drop reports with not link local source */ 1477 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1478 if (addr_type != IPV6_ADDR_ANY && 1479 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1480 return -EINVAL; 1481 1482 idev = __in6_dev_get(skb->dev); 1483 if (!idev) 1484 return -ENODEV; 1485 1486 /* 1487 * Cancel the timer for this group 1488 */ 1489 1490 read_lock_bh(&idev->lock); 1491 for (ma = idev->mc_list; ma; ma = ma->next) { 1492 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1493 spin_lock(&ma->mca_lock); 1494 if (del_timer(&ma->mca_timer)) 1495 refcount_dec(&ma->mca_refcnt); 1496 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1497 spin_unlock(&ma->mca_lock); 1498 break; 1499 } 1500 } 1501 read_unlock_bh(&idev->lock); 1502 return 0; 1503 } 1504 1505 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1506 int gdeleted, int sdeleted) 1507 { 1508 switch (type) { 1509 case MLD2_MODE_IS_INCLUDE: 1510 case MLD2_MODE_IS_EXCLUDE: 1511 if (gdeleted || sdeleted) 1512 return false; 1513 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1514 if (pmc->mca_sfmode == MCAST_INCLUDE) 1515 return true; 1516 /* don't include if this source is excluded 1517 * in all filters 1518 */ 1519 if (psf->sf_count[MCAST_INCLUDE]) 1520 return type == MLD2_MODE_IS_INCLUDE; 1521 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1522 psf->sf_count[MCAST_EXCLUDE]; 1523 } 1524 return false; 1525 case MLD2_CHANGE_TO_INCLUDE: 1526 if (gdeleted || sdeleted) 1527 return false; 1528 return psf->sf_count[MCAST_INCLUDE] != 0; 1529 case MLD2_CHANGE_TO_EXCLUDE: 1530 if (gdeleted || sdeleted) 1531 return false; 1532 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1533 psf->sf_count[MCAST_INCLUDE]) 1534 return false; 1535 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1536 psf->sf_count[MCAST_EXCLUDE]; 1537 case MLD2_ALLOW_NEW_SOURCES: 1538 if (gdeleted || !psf->sf_crcount) 1539 return false; 1540 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1541 case MLD2_BLOCK_OLD_SOURCES: 1542 if (pmc->mca_sfmode == MCAST_INCLUDE) 1543 return gdeleted || (psf->sf_crcount && sdeleted); 1544 return psf->sf_crcount && !gdeleted && !sdeleted; 1545 } 1546 return false; 1547 } 1548 1549 static int 1550 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1551 { 1552 struct ip6_sf_list *psf; 1553 int scount = 0; 1554 1555 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1556 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1557 continue; 1558 scount++; 1559 } 1560 return scount; 1561 } 1562 1563 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1564 struct net_device *dev, 1565 const struct in6_addr *saddr, 1566 const struct in6_addr *daddr, 1567 int proto, int len) 1568 { 1569 struct ipv6hdr *hdr; 1570 1571 skb->protocol = htons(ETH_P_IPV6); 1572 skb->dev = dev; 1573 1574 skb_reset_network_header(skb); 1575 skb_put(skb, sizeof(struct ipv6hdr)); 1576 hdr = ipv6_hdr(skb); 1577 1578 ip6_flow_hdr(hdr, 0, 0); 1579 1580 hdr->payload_len = htons(len); 1581 hdr->nexthdr = proto; 1582 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1583 1584 hdr->saddr = *saddr; 1585 hdr->daddr = *daddr; 1586 } 1587 1588 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1589 { 1590 struct net_device *dev = idev->dev; 1591 struct net *net = dev_net(dev); 1592 struct sock *sk = net->ipv6.igmp_sk; 1593 struct sk_buff *skb; 1594 struct mld2_report *pmr; 1595 struct in6_addr addr_buf; 1596 const struct in6_addr *saddr; 1597 int hlen = LL_RESERVED_SPACE(dev); 1598 int tlen = dev->needed_tailroom; 1599 unsigned int size = mtu + hlen + tlen; 1600 int err; 1601 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1602 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1603 IPV6_TLV_PADN, 0 }; 1604 1605 /* we assume size > sizeof(ra) here */ 1606 /* limit our allocations to order-0 page */ 1607 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1608 skb = sock_alloc_send_skb(sk, size, 1, &err); 1609 1610 if (!skb) 1611 return NULL; 1612 1613 skb->priority = TC_PRIO_CONTROL; 1614 skb_reserve(skb, hlen); 1615 skb_tailroom_reserve(skb, mtu, tlen); 1616 1617 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1618 /* <draft-ietf-magma-mld-source-05.txt>: 1619 * use unspecified address as the source address 1620 * when a valid link-local address is not available. 1621 */ 1622 saddr = &in6addr_any; 1623 } else 1624 saddr = &addr_buf; 1625 1626 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1627 1628 skb_put_data(skb, ra, sizeof(ra)); 1629 1630 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1631 skb_put(skb, sizeof(*pmr)); 1632 pmr = (struct mld2_report *)skb_transport_header(skb); 1633 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1634 pmr->mld2r_resv1 = 0; 1635 pmr->mld2r_cksum = 0; 1636 pmr->mld2r_resv2 = 0; 1637 pmr->mld2r_ngrec = 0; 1638 return skb; 1639 } 1640 1641 static void mld_sendpack(struct sk_buff *skb) 1642 { 1643 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1644 struct mld2_report *pmr = 1645 (struct mld2_report *)skb_transport_header(skb); 1646 int payload_len, mldlen; 1647 struct inet6_dev *idev; 1648 struct net *net = dev_net(skb->dev); 1649 int err; 1650 struct flowi6 fl6; 1651 struct dst_entry *dst; 1652 1653 rcu_read_lock(); 1654 idev = __in6_dev_get(skb->dev); 1655 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1656 1657 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1658 sizeof(*pip6); 1659 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1660 pip6->payload_len = htons(payload_len); 1661 1662 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1663 IPPROTO_ICMPV6, 1664 csum_partial(skb_transport_header(skb), 1665 mldlen, 0)); 1666 1667 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1668 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1669 skb->dev->ifindex); 1670 dst = icmp6_dst_alloc(skb->dev, &fl6); 1671 1672 err = 0; 1673 if (IS_ERR(dst)) { 1674 err = PTR_ERR(dst); 1675 dst = NULL; 1676 } 1677 skb_dst_set(skb, dst); 1678 if (err) 1679 goto err_out; 1680 1681 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1682 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1683 dst_output); 1684 out: 1685 if (!err) { 1686 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1687 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1688 } else { 1689 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1690 } 1691 1692 rcu_read_unlock(); 1693 return; 1694 1695 err_out: 1696 kfree_skb(skb); 1697 goto out; 1698 } 1699 1700 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1701 { 1702 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1703 } 1704 1705 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1706 int type, struct mld2_grec **ppgr, unsigned int mtu) 1707 { 1708 struct mld2_report *pmr; 1709 struct mld2_grec *pgr; 1710 1711 if (!skb) { 1712 skb = mld_newpack(pmc->idev, mtu); 1713 if (!skb) 1714 return NULL; 1715 } 1716 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1717 pgr->grec_type = type; 1718 pgr->grec_auxwords = 0; 1719 pgr->grec_nsrcs = 0; 1720 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1721 pmr = (struct mld2_report *)skb_transport_header(skb); 1722 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1723 *ppgr = pgr; 1724 return skb; 1725 } 1726 1727 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1728 1729 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1730 int type, int gdeleted, int sdeleted, int crsend) 1731 { 1732 struct inet6_dev *idev = pmc->idev; 1733 struct net_device *dev = idev->dev; 1734 struct mld2_report *pmr; 1735 struct mld2_grec *pgr = NULL; 1736 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1737 int scount, stotal, first, isquery, truncate; 1738 unsigned int mtu; 1739 1740 if (pmc->mca_flags & MAF_NOREPORT) 1741 return skb; 1742 1743 mtu = READ_ONCE(dev->mtu); 1744 if (mtu < IPV6_MIN_MTU) 1745 return skb; 1746 1747 isquery = type == MLD2_MODE_IS_INCLUDE || 1748 type == MLD2_MODE_IS_EXCLUDE; 1749 truncate = type == MLD2_MODE_IS_EXCLUDE || 1750 type == MLD2_CHANGE_TO_EXCLUDE; 1751 1752 stotal = scount = 0; 1753 1754 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1755 1756 if (!*psf_list) 1757 goto empty_source; 1758 1759 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1760 1761 /* EX and TO_EX get a fresh packet, if needed */ 1762 if (truncate) { 1763 if (pmr && pmr->mld2r_ngrec && 1764 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1765 if (skb) 1766 mld_sendpack(skb); 1767 skb = mld_newpack(idev, mtu); 1768 } 1769 } 1770 first = 1; 1771 psf_prev = NULL; 1772 for (psf = *psf_list; psf; psf = psf_next) { 1773 struct in6_addr *psrc; 1774 1775 psf_next = psf->sf_next; 1776 1777 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1778 psf_prev = psf; 1779 continue; 1780 } 1781 1782 /* Based on RFC3810 6.1. Should not send source-list change 1783 * records when there is a filter mode change. 1784 */ 1785 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1786 (!gdeleted && pmc->mca_crcount)) && 1787 (type == MLD2_ALLOW_NEW_SOURCES || 1788 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1789 goto decrease_sf_crcount; 1790 1791 /* clear marks on query responses */ 1792 if (isquery) 1793 psf->sf_gsresp = 0; 1794 1795 if (AVAILABLE(skb) < sizeof(*psrc) + 1796 first*sizeof(struct mld2_grec)) { 1797 if (truncate && !first) 1798 break; /* truncate these */ 1799 if (pgr) 1800 pgr->grec_nsrcs = htons(scount); 1801 if (skb) 1802 mld_sendpack(skb); 1803 skb = mld_newpack(idev, mtu); 1804 first = 1; 1805 scount = 0; 1806 } 1807 if (first) { 1808 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1809 first = 0; 1810 } 1811 if (!skb) 1812 return NULL; 1813 psrc = skb_put(skb, sizeof(*psrc)); 1814 *psrc = psf->sf_addr; 1815 scount++; stotal++; 1816 if ((type == MLD2_ALLOW_NEW_SOURCES || 1817 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1818 decrease_sf_crcount: 1819 psf->sf_crcount--; 1820 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1821 if (psf_prev) 1822 psf_prev->sf_next = psf->sf_next; 1823 else 1824 *psf_list = psf->sf_next; 1825 kfree(psf); 1826 continue; 1827 } 1828 } 1829 psf_prev = psf; 1830 } 1831 1832 empty_source: 1833 if (!stotal) { 1834 if (type == MLD2_ALLOW_NEW_SOURCES || 1835 type == MLD2_BLOCK_OLD_SOURCES) 1836 return skb; 1837 if (pmc->mca_crcount || isquery || crsend) { 1838 /* make sure we have room for group header */ 1839 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1840 mld_sendpack(skb); 1841 skb = NULL; /* add_grhead will get a new one */ 1842 } 1843 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1844 } 1845 } 1846 if (pgr) 1847 pgr->grec_nsrcs = htons(scount); 1848 1849 if (isquery) 1850 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1851 return skb; 1852 } 1853 1854 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1855 { 1856 struct sk_buff *skb = NULL; 1857 int type; 1858 1859 read_lock_bh(&idev->lock); 1860 if (!pmc) { 1861 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1862 if (pmc->mca_flags & MAF_NOREPORT) 1863 continue; 1864 spin_lock_bh(&pmc->mca_lock); 1865 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1866 type = MLD2_MODE_IS_EXCLUDE; 1867 else 1868 type = MLD2_MODE_IS_INCLUDE; 1869 skb = add_grec(skb, pmc, type, 0, 0, 0); 1870 spin_unlock_bh(&pmc->mca_lock); 1871 } 1872 } else { 1873 spin_lock_bh(&pmc->mca_lock); 1874 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1875 type = MLD2_MODE_IS_EXCLUDE; 1876 else 1877 type = MLD2_MODE_IS_INCLUDE; 1878 skb = add_grec(skb, pmc, type, 0, 0, 0); 1879 spin_unlock_bh(&pmc->mca_lock); 1880 } 1881 read_unlock_bh(&idev->lock); 1882 if (skb) 1883 mld_sendpack(skb); 1884 } 1885 1886 /* 1887 * remove zero-count source records from a source filter list 1888 */ 1889 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1890 { 1891 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1892 1893 psf_prev = NULL; 1894 for (psf = *ppsf; psf; psf = psf_next) { 1895 psf_next = psf->sf_next; 1896 if (psf->sf_crcount == 0) { 1897 if (psf_prev) 1898 psf_prev->sf_next = psf->sf_next; 1899 else 1900 *ppsf = psf->sf_next; 1901 kfree(psf); 1902 } else 1903 psf_prev = psf; 1904 } 1905 } 1906 1907 static void mld_send_cr(struct inet6_dev *idev) 1908 { 1909 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1910 struct sk_buff *skb = NULL; 1911 int type, dtype; 1912 1913 read_lock_bh(&idev->lock); 1914 spin_lock(&idev->mc_lock); 1915 1916 /* deleted MCA's */ 1917 pmc_prev = NULL; 1918 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) { 1919 pmc_next = pmc->next; 1920 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1921 type = MLD2_BLOCK_OLD_SOURCES; 1922 dtype = MLD2_BLOCK_OLD_SOURCES; 1923 skb = add_grec(skb, pmc, type, 1, 0, 0); 1924 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 1925 } 1926 if (pmc->mca_crcount) { 1927 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1928 type = MLD2_CHANGE_TO_INCLUDE; 1929 skb = add_grec(skb, pmc, type, 1, 0, 0); 1930 } 1931 pmc->mca_crcount--; 1932 if (pmc->mca_crcount == 0) { 1933 mld_clear_zeros(&pmc->mca_tomb); 1934 mld_clear_zeros(&pmc->mca_sources); 1935 } 1936 } 1937 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1938 !pmc->mca_sources) { 1939 if (pmc_prev) 1940 pmc_prev->next = pmc_next; 1941 else 1942 idev->mc_tomb = pmc_next; 1943 in6_dev_put(pmc->idev); 1944 kfree(pmc); 1945 } else 1946 pmc_prev = pmc; 1947 } 1948 spin_unlock(&idev->mc_lock); 1949 1950 /* change recs */ 1951 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1952 spin_lock_bh(&pmc->mca_lock); 1953 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1954 type = MLD2_BLOCK_OLD_SOURCES; 1955 dtype = MLD2_ALLOW_NEW_SOURCES; 1956 } else { 1957 type = MLD2_ALLOW_NEW_SOURCES; 1958 dtype = MLD2_BLOCK_OLD_SOURCES; 1959 } 1960 skb = add_grec(skb, pmc, type, 0, 0, 0); 1961 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 1962 1963 /* filter mode changes */ 1964 if (pmc->mca_crcount) { 1965 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1966 type = MLD2_CHANGE_TO_EXCLUDE; 1967 else 1968 type = MLD2_CHANGE_TO_INCLUDE; 1969 skb = add_grec(skb, pmc, type, 0, 0, 0); 1970 pmc->mca_crcount--; 1971 } 1972 spin_unlock_bh(&pmc->mca_lock); 1973 } 1974 read_unlock_bh(&idev->lock); 1975 if (!skb) 1976 return; 1977 (void) mld_sendpack(skb); 1978 } 1979 1980 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1981 { 1982 struct net *net = dev_net(dev); 1983 struct sock *sk = net->ipv6.igmp_sk; 1984 struct inet6_dev *idev; 1985 struct sk_buff *skb; 1986 struct mld_msg *hdr; 1987 const struct in6_addr *snd_addr, *saddr; 1988 struct in6_addr addr_buf; 1989 int hlen = LL_RESERVED_SPACE(dev); 1990 int tlen = dev->needed_tailroom; 1991 int err, len, payload_len, full_len; 1992 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1993 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1994 IPV6_TLV_PADN, 0 }; 1995 struct flowi6 fl6; 1996 struct dst_entry *dst; 1997 1998 if (type == ICMPV6_MGM_REDUCTION) 1999 snd_addr = &in6addr_linklocal_allrouters; 2000 else 2001 snd_addr = addr; 2002 2003 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2004 payload_len = len + sizeof(ra); 2005 full_len = sizeof(struct ipv6hdr) + payload_len; 2006 2007 rcu_read_lock(); 2008 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 2009 IPSTATS_MIB_OUT, full_len); 2010 rcu_read_unlock(); 2011 2012 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2013 2014 if (!skb) { 2015 rcu_read_lock(); 2016 IP6_INC_STATS(net, __in6_dev_get(dev), 2017 IPSTATS_MIB_OUTDISCARDS); 2018 rcu_read_unlock(); 2019 return; 2020 } 2021 skb->priority = TC_PRIO_CONTROL; 2022 skb_reserve(skb, hlen); 2023 2024 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2025 /* <draft-ietf-magma-mld-source-05.txt>: 2026 * use unspecified address as the source address 2027 * when a valid link-local address is not available. 2028 */ 2029 saddr = &in6addr_any; 2030 } else 2031 saddr = &addr_buf; 2032 2033 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2034 2035 skb_put_data(skb, ra, sizeof(ra)); 2036 2037 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2038 hdr->mld_type = type; 2039 hdr->mld_mca = *addr; 2040 2041 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2042 IPPROTO_ICMPV6, 2043 csum_partial(hdr, len, 0)); 2044 2045 rcu_read_lock(); 2046 idev = __in6_dev_get(skb->dev); 2047 2048 icmpv6_flow_init(sk, &fl6, type, 2049 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2050 skb->dev->ifindex); 2051 dst = icmp6_dst_alloc(skb->dev, &fl6); 2052 if (IS_ERR(dst)) { 2053 err = PTR_ERR(dst); 2054 goto err_out; 2055 } 2056 2057 skb_dst_set(skb, dst); 2058 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2059 net, sk, skb, NULL, skb->dev, 2060 dst_output); 2061 out: 2062 if (!err) { 2063 ICMP6MSGOUT_INC_STATS(net, idev, type); 2064 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2065 } else 2066 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2067 2068 rcu_read_unlock(); 2069 return; 2070 2071 err_out: 2072 kfree_skb(skb); 2073 goto out; 2074 } 2075 2076 static void mld_send_initial_cr(struct inet6_dev *idev) 2077 { 2078 struct sk_buff *skb; 2079 struct ifmcaddr6 *pmc; 2080 int type; 2081 2082 if (mld_in_v1_mode(idev)) 2083 return; 2084 2085 skb = NULL; 2086 read_lock_bh(&idev->lock); 2087 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2088 spin_lock_bh(&pmc->mca_lock); 2089 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2090 type = MLD2_CHANGE_TO_EXCLUDE; 2091 else 2092 type = MLD2_ALLOW_NEW_SOURCES; 2093 skb = add_grec(skb, pmc, type, 0, 0, 1); 2094 spin_unlock_bh(&pmc->mca_lock); 2095 } 2096 read_unlock_bh(&idev->lock); 2097 if (skb) 2098 mld_sendpack(skb); 2099 } 2100 2101 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2102 { 2103 idev->mc_dad_count = idev->mc_qrv; 2104 if (idev->mc_dad_count) { 2105 mld_send_initial_cr(idev); 2106 idev->mc_dad_count--; 2107 if (idev->mc_dad_count) 2108 mld_dad_start_timer(idev, 2109 unsolicited_report_interval(idev)); 2110 } 2111 } 2112 2113 static void mld_dad_timer_expire(struct timer_list *t) 2114 { 2115 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer); 2116 2117 mld_send_initial_cr(idev); 2118 if (idev->mc_dad_count) { 2119 idev->mc_dad_count--; 2120 if (idev->mc_dad_count) 2121 mld_dad_start_timer(idev, 2122 unsolicited_report_interval(idev)); 2123 } 2124 in6_dev_put(idev); 2125 } 2126 2127 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2128 const struct in6_addr *psfsrc) 2129 { 2130 struct ip6_sf_list *psf, *psf_prev; 2131 int rv = 0; 2132 2133 psf_prev = NULL; 2134 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2135 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2136 break; 2137 psf_prev = psf; 2138 } 2139 if (!psf || psf->sf_count[sfmode] == 0) { 2140 /* source filter not found, or count wrong => bug */ 2141 return -ESRCH; 2142 } 2143 psf->sf_count[sfmode]--; 2144 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2145 struct inet6_dev *idev = pmc->idev; 2146 2147 /* no more filters for this source */ 2148 if (psf_prev) 2149 psf_prev->sf_next = psf->sf_next; 2150 else 2151 pmc->mca_sources = psf->sf_next; 2152 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2153 !mld_in_v1_mode(idev)) { 2154 psf->sf_crcount = idev->mc_qrv; 2155 psf->sf_next = pmc->mca_tomb; 2156 pmc->mca_tomb = psf; 2157 rv = 1; 2158 } else 2159 kfree(psf); 2160 } 2161 return rv; 2162 } 2163 2164 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2165 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2166 int delta) 2167 { 2168 struct ifmcaddr6 *pmc; 2169 int changerec = 0; 2170 int i, err; 2171 2172 if (!idev) 2173 return -ENODEV; 2174 read_lock_bh(&idev->lock); 2175 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2176 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2177 break; 2178 } 2179 if (!pmc) { 2180 /* MCA not found?? bug */ 2181 read_unlock_bh(&idev->lock); 2182 return -ESRCH; 2183 } 2184 spin_lock_bh(&pmc->mca_lock); 2185 sf_markstate(pmc); 2186 if (!delta) { 2187 if (!pmc->mca_sfcount[sfmode]) { 2188 spin_unlock_bh(&pmc->mca_lock); 2189 read_unlock_bh(&idev->lock); 2190 return -EINVAL; 2191 } 2192 pmc->mca_sfcount[sfmode]--; 2193 } 2194 err = 0; 2195 for (i = 0; i < sfcount; i++) { 2196 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2197 2198 changerec |= rv > 0; 2199 if (!err && rv < 0) 2200 err = rv; 2201 } 2202 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2203 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2204 pmc->mca_sfcount[MCAST_INCLUDE]) { 2205 struct ip6_sf_list *psf; 2206 2207 /* filter mode change */ 2208 pmc->mca_sfmode = MCAST_INCLUDE; 2209 pmc->mca_crcount = idev->mc_qrv; 2210 idev->mc_ifc_count = pmc->mca_crcount; 2211 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2212 psf->sf_crcount = 0; 2213 mld_ifc_event(pmc->idev); 2214 } else if (sf_setstate(pmc) || changerec) 2215 mld_ifc_event(pmc->idev); 2216 spin_unlock_bh(&pmc->mca_lock); 2217 read_unlock_bh(&idev->lock); 2218 return err; 2219 } 2220 2221 /* 2222 * Add multicast single-source filter to the interface list 2223 */ 2224 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2225 const struct in6_addr *psfsrc) 2226 { 2227 struct ip6_sf_list *psf, *psf_prev; 2228 2229 psf_prev = NULL; 2230 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2231 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2232 break; 2233 psf_prev = psf; 2234 } 2235 if (!psf) { 2236 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 2237 if (!psf) 2238 return -ENOBUFS; 2239 2240 psf->sf_addr = *psfsrc; 2241 if (psf_prev) { 2242 psf_prev->sf_next = psf; 2243 } else 2244 pmc->mca_sources = psf; 2245 } 2246 psf->sf_count[sfmode]++; 2247 return 0; 2248 } 2249 2250 static void sf_markstate(struct ifmcaddr6 *pmc) 2251 { 2252 struct ip6_sf_list *psf; 2253 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2254 2255 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2256 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2257 psf->sf_oldin = mca_xcount == 2258 psf->sf_count[MCAST_EXCLUDE] && 2259 !psf->sf_count[MCAST_INCLUDE]; 2260 } else 2261 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2262 } 2263 2264 static int sf_setstate(struct ifmcaddr6 *pmc) 2265 { 2266 struct ip6_sf_list *psf, *dpsf; 2267 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2268 int qrv = pmc->idev->mc_qrv; 2269 int new_in, rv; 2270 2271 rv = 0; 2272 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2273 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2274 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2275 !psf->sf_count[MCAST_INCLUDE]; 2276 } else 2277 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2278 if (new_in) { 2279 if (!psf->sf_oldin) { 2280 struct ip6_sf_list *prev = NULL; 2281 2282 for (dpsf = pmc->mca_tomb; dpsf; 2283 dpsf = dpsf->sf_next) { 2284 if (ipv6_addr_equal(&dpsf->sf_addr, 2285 &psf->sf_addr)) 2286 break; 2287 prev = dpsf; 2288 } 2289 if (dpsf) { 2290 if (prev) 2291 prev->sf_next = dpsf->sf_next; 2292 else 2293 pmc->mca_tomb = dpsf->sf_next; 2294 kfree(dpsf); 2295 } 2296 psf->sf_crcount = qrv; 2297 rv++; 2298 } 2299 } else if (psf->sf_oldin) { 2300 psf->sf_crcount = 0; 2301 /* 2302 * add or update "delete" records if an active filter 2303 * is now inactive 2304 */ 2305 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next) 2306 if (ipv6_addr_equal(&dpsf->sf_addr, 2307 &psf->sf_addr)) 2308 break; 2309 if (!dpsf) { 2310 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2311 if (!dpsf) 2312 continue; 2313 *dpsf = *psf; 2314 /* pmc->mca_lock held by callers */ 2315 dpsf->sf_next = pmc->mca_tomb; 2316 pmc->mca_tomb = dpsf; 2317 } 2318 dpsf->sf_crcount = qrv; 2319 rv++; 2320 } 2321 } 2322 return rv; 2323 } 2324 2325 /* 2326 * Add multicast source filter list to the interface list 2327 */ 2328 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2329 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2330 int delta) 2331 { 2332 struct ifmcaddr6 *pmc; 2333 int isexclude; 2334 int i, err; 2335 2336 if (!idev) 2337 return -ENODEV; 2338 read_lock_bh(&idev->lock); 2339 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2340 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2341 break; 2342 } 2343 if (!pmc) { 2344 /* MCA not found?? bug */ 2345 read_unlock_bh(&idev->lock); 2346 return -ESRCH; 2347 } 2348 spin_lock_bh(&pmc->mca_lock); 2349 2350 sf_markstate(pmc); 2351 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2352 if (!delta) 2353 pmc->mca_sfcount[sfmode]++; 2354 err = 0; 2355 for (i = 0; i < sfcount; i++) { 2356 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2357 if (err) 2358 break; 2359 } 2360 if (err) { 2361 int j; 2362 2363 if (!delta) 2364 pmc->mca_sfcount[sfmode]--; 2365 for (j = 0; j < i; j++) 2366 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2367 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2368 struct ip6_sf_list *psf; 2369 2370 /* filter mode change */ 2371 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2372 pmc->mca_sfmode = MCAST_EXCLUDE; 2373 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2374 pmc->mca_sfmode = MCAST_INCLUDE; 2375 /* else no filters; keep old mode for reports */ 2376 2377 pmc->mca_crcount = idev->mc_qrv; 2378 idev->mc_ifc_count = pmc->mca_crcount; 2379 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2380 psf->sf_crcount = 0; 2381 mld_ifc_event(idev); 2382 } else if (sf_setstate(pmc)) 2383 mld_ifc_event(idev); 2384 spin_unlock_bh(&pmc->mca_lock); 2385 read_unlock_bh(&idev->lock); 2386 return err; 2387 } 2388 2389 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2390 { 2391 struct ip6_sf_list *psf, *nextpsf; 2392 2393 for (psf = pmc->mca_tomb; psf; psf = nextpsf) { 2394 nextpsf = psf->sf_next; 2395 kfree(psf); 2396 } 2397 pmc->mca_tomb = NULL; 2398 for (psf = pmc->mca_sources; psf; psf = nextpsf) { 2399 nextpsf = psf->sf_next; 2400 kfree(psf); 2401 } 2402 pmc->mca_sources = NULL; 2403 pmc->mca_sfmode = MCAST_EXCLUDE; 2404 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2405 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2406 } 2407 2408 2409 static void igmp6_join_group(struct ifmcaddr6 *ma) 2410 { 2411 unsigned long delay; 2412 2413 if (ma->mca_flags & MAF_NOREPORT) 2414 return; 2415 2416 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2417 2418 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2419 2420 spin_lock_bh(&ma->mca_lock); 2421 if (del_timer(&ma->mca_timer)) { 2422 refcount_dec(&ma->mca_refcnt); 2423 delay = ma->mca_timer.expires - jiffies; 2424 } 2425 2426 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2427 refcount_inc(&ma->mca_refcnt); 2428 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2429 spin_unlock_bh(&ma->mca_lock); 2430 } 2431 2432 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2433 struct inet6_dev *idev) 2434 { 2435 int err; 2436 2437 write_lock_bh(&iml->sflock); 2438 if (!iml->sflist) { 2439 /* any-source empty exclude case */ 2440 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2441 } else { 2442 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2443 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2444 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2445 iml->sflist = NULL; 2446 } 2447 write_unlock_bh(&iml->sflock); 2448 return err; 2449 } 2450 2451 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2452 { 2453 if (mld_in_v1_mode(ma->idev)) { 2454 if (ma->mca_flags & MAF_LAST_REPORTER) 2455 igmp6_send(&ma->mca_addr, ma->idev->dev, 2456 ICMPV6_MGM_REDUCTION); 2457 } else { 2458 mld_add_delrec(ma->idev, ma); 2459 mld_ifc_event(ma->idev); 2460 } 2461 } 2462 2463 static void mld_gq_timer_expire(struct timer_list *t) 2464 { 2465 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer); 2466 2467 idev->mc_gq_running = 0; 2468 mld_send_report(idev, NULL); 2469 in6_dev_put(idev); 2470 } 2471 2472 static void mld_ifc_timer_expire(struct timer_list *t) 2473 { 2474 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer); 2475 2476 mld_send_cr(idev); 2477 if (idev->mc_ifc_count) { 2478 idev->mc_ifc_count--; 2479 if (idev->mc_ifc_count) 2480 mld_ifc_start_timer(idev, 2481 unsolicited_report_interval(idev)); 2482 } 2483 in6_dev_put(idev); 2484 } 2485 2486 static void mld_ifc_event(struct inet6_dev *idev) 2487 { 2488 if (mld_in_v1_mode(idev)) 2489 return; 2490 idev->mc_ifc_count = idev->mc_qrv; 2491 mld_ifc_start_timer(idev, 1); 2492 } 2493 2494 static void igmp6_timer_handler(struct timer_list *t) 2495 { 2496 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer); 2497 2498 if (mld_in_v1_mode(ma->idev)) 2499 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2500 else 2501 mld_send_report(ma->idev, ma); 2502 2503 spin_lock(&ma->mca_lock); 2504 ma->mca_flags |= MAF_LAST_REPORTER; 2505 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2506 spin_unlock(&ma->mca_lock); 2507 ma_put(ma); 2508 } 2509 2510 /* Device changing type */ 2511 2512 void ipv6_mc_unmap(struct inet6_dev *idev) 2513 { 2514 struct ifmcaddr6 *i; 2515 2516 /* Install multicast list, except for all-nodes (already installed) */ 2517 2518 read_lock_bh(&idev->lock); 2519 for (i = idev->mc_list; i; i = i->next) 2520 igmp6_group_dropped(i); 2521 read_unlock_bh(&idev->lock); 2522 } 2523 2524 void ipv6_mc_remap(struct inet6_dev *idev) 2525 { 2526 ipv6_mc_up(idev); 2527 } 2528 2529 /* Device going down */ 2530 2531 void ipv6_mc_down(struct inet6_dev *idev) 2532 { 2533 struct ifmcaddr6 *i; 2534 2535 /* Withdraw multicast list */ 2536 2537 read_lock_bh(&idev->lock); 2538 2539 for (i = idev->mc_list; i; i = i->next) 2540 igmp6_group_dropped(i); 2541 2542 /* Should stop timer after group drop. or we will 2543 * start timer again in mld_ifc_event() 2544 */ 2545 mld_ifc_stop_timer(idev); 2546 mld_gq_stop_timer(idev); 2547 mld_dad_stop_timer(idev); 2548 read_unlock_bh(&idev->lock); 2549 } 2550 2551 static void ipv6_mc_reset(struct inet6_dev *idev) 2552 { 2553 idev->mc_qrv = sysctl_mld_qrv; 2554 idev->mc_qi = MLD_QI_DEFAULT; 2555 idev->mc_qri = MLD_QRI_DEFAULT; 2556 idev->mc_v1_seen = 0; 2557 idev->mc_maxdelay = unsolicited_report_interval(idev); 2558 } 2559 2560 /* Device going up */ 2561 2562 void ipv6_mc_up(struct inet6_dev *idev) 2563 { 2564 struct ifmcaddr6 *i; 2565 2566 /* Install multicast list, except for all-nodes (already installed) */ 2567 2568 read_lock_bh(&idev->lock); 2569 ipv6_mc_reset(idev); 2570 for (i = idev->mc_list; i; i = i->next) { 2571 mld_del_delrec(idev, i); 2572 igmp6_group_added(i); 2573 } 2574 read_unlock_bh(&idev->lock); 2575 } 2576 2577 /* IPv6 device initialization. */ 2578 2579 void ipv6_mc_init_dev(struct inet6_dev *idev) 2580 { 2581 write_lock_bh(&idev->lock); 2582 spin_lock_init(&idev->mc_lock); 2583 idev->mc_gq_running = 0; 2584 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0); 2585 idev->mc_tomb = NULL; 2586 idev->mc_ifc_count = 0; 2587 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0); 2588 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0); 2589 ipv6_mc_reset(idev); 2590 write_unlock_bh(&idev->lock); 2591 } 2592 2593 /* 2594 * Device is about to be destroyed: clean up. 2595 */ 2596 2597 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2598 { 2599 struct ifmcaddr6 *i; 2600 2601 /* Deactivate timers */ 2602 ipv6_mc_down(idev); 2603 mld_clear_delrec(idev); 2604 2605 /* Delete all-nodes address. */ 2606 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2607 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2608 * fail. 2609 */ 2610 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2611 2612 if (idev->cnf.forwarding) 2613 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2614 2615 write_lock_bh(&idev->lock); 2616 while ((i = idev->mc_list) != NULL) { 2617 idev->mc_list = i->next; 2618 2619 write_unlock_bh(&idev->lock); 2620 ma_put(i); 2621 write_lock_bh(&idev->lock); 2622 } 2623 write_unlock_bh(&idev->lock); 2624 } 2625 2626 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2627 { 2628 struct ifmcaddr6 *pmc; 2629 2630 ASSERT_RTNL(); 2631 2632 if (mld_in_v1_mode(idev)) { 2633 read_lock_bh(&idev->lock); 2634 for (pmc = idev->mc_list; pmc; pmc = pmc->next) 2635 igmp6_join_group(pmc); 2636 read_unlock_bh(&idev->lock); 2637 } else 2638 mld_send_report(idev, NULL); 2639 } 2640 2641 static int ipv6_mc_netdev_event(struct notifier_block *this, 2642 unsigned long event, 2643 void *ptr) 2644 { 2645 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2646 struct inet6_dev *idev = __in6_dev_get(dev); 2647 2648 switch (event) { 2649 case NETDEV_RESEND_IGMP: 2650 if (idev) 2651 ipv6_mc_rejoin_groups(idev); 2652 break; 2653 default: 2654 break; 2655 } 2656 2657 return NOTIFY_DONE; 2658 } 2659 2660 static struct notifier_block igmp6_netdev_notifier = { 2661 .notifier_call = ipv6_mc_netdev_event, 2662 }; 2663 2664 #ifdef CONFIG_PROC_FS 2665 struct igmp6_mc_iter_state { 2666 struct seq_net_private p; 2667 struct net_device *dev; 2668 struct inet6_dev *idev; 2669 }; 2670 2671 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2672 2673 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2674 { 2675 struct ifmcaddr6 *im = NULL; 2676 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2677 struct net *net = seq_file_net(seq); 2678 2679 state->idev = NULL; 2680 for_each_netdev_rcu(net, state->dev) { 2681 struct inet6_dev *idev; 2682 idev = __in6_dev_get(state->dev); 2683 if (!idev) 2684 continue; 2685 read_lock_bh(&idev->lock); 2686 im = idev->mc_list; 2687 if (im) { 2688 state->idev = idev; 2689 break; 2690 } 2691 read_unlock_bh(&idev->lock); 2692 } 2693 return im; 2694 } 2695 2696 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2697 { 2698 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2699 2700 im = im->next; 2701 while (!im) { 2702 if (likely(state->idev)) 2703 read_unlock_bh(&state->idev->lock); 2704 2705 state->dev = next_net_device_rcu(state->dev); 2706 if (!state->dev) { 2707 state->idev = NULL; 2708 break; 2709 } 2710 state->idev = __in6_dev_get(state->dev); 2711 if (!state->idev) 2712 continue; 2713 read_lock_bh(&state->idev->lock); 2714 im = state->idev->mc_list; 2715 } 2716 return im; 2717 } 2718 2719 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2720 { 2721 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2722 if (im) 2723 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2724 --pos; 2725 return pos ? NULL : im; 2726 } 2727 2728 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2729 __acquires(RCU) 2730 { 2731 rcu_read_lock(); 2732 return igmp6_mc_get_idx(seq, *pos); 2733 } 2734 2735 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2736 { 2737 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2738 2739 ++*pos; 2740 return im; 2741 } 2742 2743 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2744 __releases(RCU) 2745 { 2746 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2747 2748 if (likely(state->idev)) { 2749 read_unlock_bh(&state->idev->lock); 2750 state->idev = NULL; 2751 } 2752 state->dev = NULL; 2753 rcu_read_unlock(); 2754 } 2755 2756 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2757 { 2758 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2759 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2760 2761 seq_printf(seq, 2762 "%-4d %-15s %pi6 %5d %08X %ld\n", 2763 state->dev->ifindex, state->dev->name, 2764 &im->mca_addr, 2765 im->mca_users, im->mca_flags, 2766 (im->mca_flags&MAF_TIMER_RUNNING) ? 2767 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2768 return 0; 2769 } 2770 2771 static const struct seq_operations igmp6_mc_seq_ops = { 2772 .start = igmp6_mc_seq_start, 2773 .next = igmp6_mc_seq_next, 2774 .stop = igmp6_mc_seq_stop, 2775 .show = igmp6_mc_seq_show, 2776 }; 2777 2778 struct igmp6_mcf_iter_state { 2779 struct seq_net_private p; 2780 struct net_device *dev; 2781 struct inet6_dev *idev; 2782 struct ifmcaddr6 *im; 2783 }; 2784 2785 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2786 2787 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2788 { 2789 struct ip6_sf_list *psf = NULL; 2790 struct ifmcaddr6 *im = NULL; 2791 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2792 struct net *net = seq_file_net(seq); 2793 2794 state->idev = NULL; 2795 state->im = NULL; 2796 for_each_netdev_rcu(net, state->dev) { 2797 struct inet6_dev *idev; 2798 idev = __in6_dev_get(state->dev); 2799 if (unlikely(idev == NULL)) 2800 continue; 2801 read_lock_bh(&idev->lock); 2802 im = idev->mc_list; 2803 if (likely(im)) { 2804 spin_lock_bh(&im->mca_lock); 2805 psf = im->mca_sources; 2806 if (likely(psf)) { 2807 state->im = im; 2808 state->idev = idev; 2809 break; 2810 } 2811 spin_unlock_bh(&im->mca_lock); 2812 } 2813 read_unlock_bh(&idev->lock); 2814 } 2815 return psf; 2816 } 2817 2818 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2819 { 2820 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2821 2822 psf = psf->sf_next; 2823 while (!psf) { 2824 spin_unlock_bh(&state->im->mca_lock); 2825 state->im = state->im->next; 2826 while (!state->im) { 2827 if (likely(state->idev)) 2828 read_unlock_bh(&state->idev->lock); 2829 2830 state->dev = next_net_device_rcu(state->dev); 2831 if (!state->dev) { 2832 state->idev = NULL; 2833 goto out; 2834 } 2835 state->idev = __in6_dev_get(state->dev); 2836 if (!state->idev) 2837 continue; 2838 read_lock_bh(&state->idev->lock); 2839 state->im = state->idev->mc_list; 2840 } 2841 if (!state->im) 2842 break; 2843 spin_lock_bh(&state->im->mca_lock); 2844 psf = state->im->mca_sources; 2845 } 2846 out: 2847 return psf; 2848 } 2849 2850 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2851 { 2852 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2853 if (psf) 2854 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2855 --pos; 2856 return pos ? NULL : psf; 2857 } 2858 2859 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2860 __acquires(RCU) 2861 { 2862 rcu_read_lock(); 2863 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2864 } 2865 2866 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2867 { 2868 struct ip6_sf_list *psf; 2869 if (v == SEQ_START_TOKEN) 2870 psf = igmp6_mcf_get_first(seq); 2871 else 2872 psf = igmp6_mcf_get_next(seq, v); 2873 ++*pos; 2874 return psf; 2875 } 2876 2877 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2878 __releases(RCU) 2879 { 2880 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2881 if (likely(state->im)) { 2882 spin_unlock_bh(&state->im->mca_lock); 2883 state->im = NULL; 2884 } 2885 if (likely(state->idev)) { 2886 read_unlock_bh(&state->idev->lock); 2887 state->idev = NULL; 2888 } 2889 state->dev = NULL; 2890 rcu_read_unlock(); 2891 } 2892 2893 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2894 { 2895 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2896 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2897 2898 if (v == SEQ_START_TOKEN) { 2899 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 2900 } else { 2901 seq_printf(seq, 2902 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2903 state->dev->ifindex, state->dev->name, 2904 &state->im->mca_addr, 2905 &psf->sf_addr, 2906 psf->sf_count[MCAST_INCLUDE], 2907 psf->sf_count[MCAST_EXCLUDE]); 2908 } 2909 return 0; 2910 } 2911 2912 static const struct seq_operations igmp6_mcf_seq_ops = { 2913 .start = igmp6_mcf_seq_start, 2914 .next = igmp6_mcf_seq_next, 2915 .stop = igmp6_mcf_seq_stop, 2916 .show = igmp6_mcf_seq_show, 2917 }; 2918 2919 static int __net_init igmp6_proc_init(struct net *net) 2920 { 2921 int err; 2922 2923 err = -ENOMEM; 2924 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 2925 sizeof(struct igmp6_mc_iter_state))) 2926 goto out; 2927 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 2928 &igmp6_mcf_seq_ops, 2929 sizeof(struct igmp6_mcf_iter_state))) 2930 goto out_proc_net_igmp6; 2931 2932 err = 0; 2933 out: 2934 return err; 2935 2936 out_proc_net_igmp6: 2937 remove_proc_entry("igmp6", net->proc_net); 2938 goto out; 2939 } 2940 2941 static void __net_exit igmp6_proc_exit(struct net *net) 2942 { 2943 remove_proc_entry("mcfilter6", net->proc_net); 2944 remove_proc_entry("igmp6", net->proc_net); 2945 } 2946 #else 2947 static inline int igmp6_proc_init(struct net *net) 2948 { 2949 return 0; 2950 } 2951 static inline void igmp6_proc_exit(struct net *net) 2952 { 2953 } 2954 #endif 2955 2956 static int __net_init igmp6_net_init(struct net *net) 2957 { 2958 int err; 2959 2960 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2961 SOCK_RAW, IPPROTO_ICMPV6, net); 2962 if (err < 0) { 2963 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2964 err); 2965 goto out; 2966 } 2967 2968 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2969 2970 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 2971 SOCK_RAW, IPPROTO_ICMPV6, net); 2972 if (err < 0) { 2973 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 2974 err); 2975 goto out_sock_create; 2976 } 2977 2978 err = igmp6_proc_init(net); 2979 if (err) 2980 goto out_sock_create_autojoin; 2981 2982 return 0; 2983 2984 out_sock_create_autojoin: 2985 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2986 out_sock_create: 2987 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2988 out: 2989 return err; 2990 } 2991 2992 static void __net_exit igmp6_net_exit(struct net *net) 2993 { 2994 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2995 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2996 igmp6_proc_exit(net); 2997 } 2998 2999 static struct pernet_operations igmp6_net_ops = { 3000 .init = igmp6_net_init, 3001 .exit = igmp6_net_exit, 3002 }; 3003 3004 int __init igmp6_init(void) 3005 { 3006 return register_pernet_subsys(&igmp6_net_ops); 3007 } 3008 3009 int __init igmp6_late_init(void) 3010 { 3011 return register_netdevice_notifier(&igmp6_netdev_notifier); 3012 } 3013 3014 void igmp6_cleanup(void) 3015 { 3016 unregister_pernet_subsys(&igmp6_net_ops); 3017 } 3018 3019 void igmp6_late_cleanup(void) 3020 { 3021 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3022 } 3023