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