1 /* 2 * Multicast support for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 /* Changes: 17 * 18 * yoshfuji : fix format of router-alert option 19 * YOSHIFUJI Hideaki @USAGI: 20 * Fixed source address for MLD message based on 21 * <draft-ietf-magma-mld-source-05.txt>. 22 * YOSHIFUJI Hideaki @USAGI: 23 * - Ignore Queries for invalid addresses. 24 * - MLD for link-local addresses. 25 * David L Stevens <dlstevens@us.ibm.com>: 26 * - MLDv2 support 27 */ 28 29 #include <linux/module.h> 30 #include <linux/errno.h> 31 #include <linux/types.h> 32 #include <linux/string.h> 33 #include <linux/socket.h> 34 #include <linux/sockios.h> 35 #include <linux/jiffies.h> 36 #include <linux/times.h> 37 #include <linux/net.h> 38 #include <linux/in.h> 39 #include <linux/in6.h> 40 #include <linux/netdevice.h> 41 #include <linux/if_arp.h> 42 #include <linux/route.h> 43 #include <linux/init.h> 44 #include <linux/proc_fs.h> 45 #include <linux/seq_file.h> 46 #include <linux/slab.h> 47 #include <linux/pkt_sched.h> 48 #include <net/mld.h> 49 50 #include <linux/netfilter.h> 51 #include <linux/netfilter_ipv6.h> 52 53 #include <net/net_namespace.h> 54 #include <net/sock.h> 55 #include <net/snmp.h> 56 57 #include <net/ipv6.h> 58 #include <net/protocol.h> 59 #include <net/if_inet6.h> 60 #include <net/ndisc.h> 61 #include <net/addrconf.h> 62 #include <net/ip6_route.h> 63 #include <net/inet_common.h> 64 65 #include <net/ip6_checksum.h> 66 67 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = { 69 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4), 70 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4), 71 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4) 72 }; 73 74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 75 76 static void igmp6_join_group(struct ifmcaddr6 *ma); 77 static void igmp6_leave_group(struct ifmcaddr6 *ma); 78 static void igmp6_timer_handler(unsigned long data); 79 80 static void mld_gq_timer_expire(unsigned long data); 81 static void mld_ifc_timer_expire(unsigned long data); 82 static void mld_ifc_event(struct inet6_dev *idev); 83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 84 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 85 static void mld_clear_delrec(struct inet6_dev *idev); 86 static bool mld_in_v1_mode(const struct inet6_dev *idev); 87 static int sf_setstate(struct ifmcaddr6 *pmc); 88 static void sf_markstate(struct ifmcaddr6 *pmc); 89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 91 int sfmode, int sfcount, const struct in6_addr *psfsrc, 92 int delta); 93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 94 int sfmode, int sfcount, const struct in6_addr *psfsrc, 95 int delta); 96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 97 struct inet6_dev *idev); 98 99 #define MLD_QRV_DEFAULT 2 100 /* RFC3810, 9.2. Query Interval */ 101 #define MLD_QI_DEFAULT (125 * HZ) 102 /* RFC3810, 9.3. Query Response Interval */ 103 #define MLD_QRI_DEFAULT (10 * HZ) 104 105 /* RFC3810, 8.1 Query Version Distinctions */ 106 #define MLD_V1_QUERY_LEN 24 107 #define MLD_V2_QUERY_LEN_MIN 28 108 109 #define IPV6_MLD_MAX_MSF 64 110 111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; 113 114 /* 115 * socket join on multicast group 116 */ 117 118 #define for_each_pmc_rcu(np, pmc) \ 119 for (pmc = rcu_dereference(np->ipv6_mc_list); \ 120 pmc != NULL; \ 121 pmc = rcu_dereference(pmc->next)) 122 123 static int unsolicited_report_interval(struct inet6_dev *idev) 124 { 125 int iv; 126 127 if (mld_in_v1_mode(idev)) 128 iv = idev->cnf.mldv1_unsolicited_report_interval; 129 else 130 iv = idev->cnf.mldv2_unsolicited_report_interval; 131 132 return iv > 0 ? iv : 1; 133 } 134 135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 136 { 137 struct net_device *dev = NULL; 138 struct ipv6_mc_socklist *mc_lst; 139 struct ipv6_pinfo *np = inet6_sk(sk); 140 struct net *net = sock_net(sk); 141 int err; 142 143 ASSERT_RTNL(); 144 145 if (!ipv6_addr_is_multicast(addr)) 146 return -EINVAL; 147 148 rcu_read_lock(); 149 for_each_pmc_rcu(np, mc_lst) { 150 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 151 ipv6_addr_equal(&mc_lst->addr, addr)) { 152 rcu_read_unlock(); 153 return -EADDRINUSE; 154 } 155 } 156 rcu_read_unlock(); 157 158 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 159 160 if (!mc_lst) 161 return -ENOMEM; 162 163 mc_lst->next = NULL; 164 mc_lst->addr = *addr; 165 166 if (ifindex == 0) { 167 struct rt6_info *rt; 168 rt = rt6_lookup(net, addr, NULL, 0, 0); 169 if (rt) { 170 dev = rt->dst.dev; 171 ip6_rt_put(rt); 172 } 173 } else 174 dev = __dev_get_by_index(net, ifindex); 175 176 if (!dev) { 177 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 178 return -ENODEV; 179 } 180 181 mc_lst->ifindex = dev->ifindex; 182 mc_lst->sfmode = MCAST_EXCLUDE; 183 rwlock_init(&mc_lst->sflock); 184 mc_lst->sflist = NULL; 185 186 /* 187 * now add/increase the group membership on the device 188 */ 189 190 err = ipv6_dev_mc_inc(dev, addr); 191 192 if (err) { 193 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 194 return err; 195 } 196 197 mc_lst->next = np->ipv6_mc_list; 198 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 199 200 return 0; 201 } 202 EXPORT_SYMBOL(ipv6_sock_mc_join); 203 204 /* 205 * socket leave on multicast group 206 */ 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 208 { 209 struct ipv6_pinfo *np = inet6_sk(sk); 210 struct ipv6_mc_socklist *mc_lst; 211 struct ipv6_mc_socklist __rcu **lnk; 212 struct net *net = sock_net(sk); 213 214 ASSERT_RTNL(); 215 216 if (!ipv6_addr_is_multicast(addr)) 217 return -EINVAL; 218 219 for (lnk = &np->ipv6_mc_list; 220 (mc_lst = rtnl_dereference(*lnk)) != NULL; 221 lnk = &mc_lst->next) { 222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 223 ipv6_addr_equal(&mc_lst->addr, addr)) { 224 struct net_device *dev; 225 226 *lnk = mc_lst->next; 227 228 dev = __dev_get_by_index(net, mc_lst->ifindex); 229 if (dev) { 230 struct inet6_dev *idev = __in6_dev_get(dev); 231 232 (void) ip6_mc_leave_src(sk, mc_lst, idev); 233 if (idev) 234 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 235 } else 236 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 237 238 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 239 kfree_rcu(mc_lst, rcu); 240 return 0; 241 } 242 } 243 244 return -EADDRNOTAVAIL; 245 } 246 EXPORT_SYMBOL(ipv6_sock_mc_drop); 247 248 /* called with rcu_read_lock() */ 249 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 250 const struct in6_addr *group, 251 int ifindex) 252 { 253 struct net_device *dev = NULL; 254 struct inet6_dev *idev = NULL; 255 256 if (ifindex == 0) { 257 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); 258 259 if (rt) { 260 dev = rt->dst.dev; 261 ip6_rt_put(rt); 262 } 263 } else 264 dev = dev_get_by_index_rcu(net, ifindex); 265 266 if (!dev) 267 return NULL; 268 idev = __in6_dev_get(dev); 269 if (!idev) 270 return NULL; 271 read_lock_bh(&idev->lock); 272 if (idev->dead) { 273 read_unlock_bh(&idev->lock); 274 return NULL; 275 } 276 return idev; 277 } 278 279 void __ipv6_sock_mc_close(struct sock *sk) 280 { 281 struct ipv6_pinfo *np = inet6_sk(sk); 282 struct ipv6_mc_socklist *mc_lst; 283 struct net *net = sock_net(sk); 284 285 ASSERT_RTNL(); 286 287 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) { 288 struct net_device *dev; 289 290 np->ipv6_mc_list = mc_lst->next; 291 292 dev = __dev_get_by_index(net, mc_lst->ifindex); 293 if (dev) { 294 struct inet6_dev *idev = __in6_dev_get(dev); 295 296 (void) ip6_mc_leave_src(sk, mc_lst, idev); 297 if (idev) 298 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 299 } else 300 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 301 302 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 303 kfree_rcu(mc_lst, rcu); 304 } 305 } 306 307 void ipv6_sock_mc_close(struct sock *sk) 308 { 309 struct ipv6_pinfo *np = inet6_sk(sk); 310 311 if (!rcu_access_pointer(np->ipv6_mc_list)) 312 return; 313 rtnl_lock(); 314 __ipv6_sock_mc_close(sk); 315 rtnl_unlock(); 316 } 317 318 int ip6_mc_source(int add, int omode, struct sock *sk, 319 struct group_source_req *pgsr) 320 { 321 struct in6_addr *source, *group; 322 struct ipv6_mc_socklist *pmc; 323 struct inet6_dev *idev; 324 struct ipv6_pinfo *inet6 = inet6_sk(sk); 325 struct ip6_sf_socklist *psl; 326 struct net *net = sock_net(sk); 327 int i, j, rv; 328 int leavegroup = 0; 329 int pmclocked = 0; 330 int err; 331 332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 334 335 if (!ipv6_addr_is_multicast(group)) 336 return -EINVAL; 337 338 rcu_read_lock(); 339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 340 if (!idev) { 341 rcu_read_unlock(); 342 return -ENODEV; 343 } 344 345 err = -EADDRNOTAVAIL; 346 347 for_each_pmc_rcu(inet6, pmc) { 348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 349 continue; 350 if (ipv6_addr_equal(&pmc->addr, group)) 351 break; 352 } 353 if (!pmc) { /* must have a prior join */ 354 err = -EINVAL; 355 goto done; 356 } 357 /* if a source filter was set, must be the same mode as before */ 358 if (pmc->sflist) { 359 if (pmc->sfmode != omode) { 360 err = -EINVAL; 361 goto done; 362 } 363 } else if (pmc->sfmode != omode) { 364 /* allow mode switches for empty-set filters */ 365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 367 pmc->sfmode = omode; 368 } 369 370 write_lock(&pmc->sflock); 371 pmclocked = 1; 372 373 psl = pmc->sflist; 374 if (!add) { 375 if (!psl) 376 goto done; /* err = -EADDRNOTAVAIL */ 377 rv = !0; 378 for (i = 0; i < psl->sl_count; i++) { 379 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 380 if (rv == 0) 381 break; 382 } 383 if (rv) /* source not found */ 384 goto done; /* err = -EADDRNOTAVAIL */ 385 386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 388 leavegroup = 1; 389 goto done; 390 } 391 392 /* update the interface filter */ 393 ip6_mc_del_src(idev, group, omode, 1, source, 1); 394 395 for (j = i+1; j < psl->sl_count; j++) 396 psl->sl_addr[j-1] = psl->sl_addr[j]; 397 psl->sl_count--; 398 err = 0; 399 goto done; 400 } 401 /* else, add a new source to the filter */ 402 403 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 404 err = -ENOBUFS; 405 goto done; 406 } 407 if (!psl || psl->sl_count == psl->sl_max) { 408 struct ip6_sf_socklist *newpsl; 409 int count = IP6_SFBLOCK; 410 411 if (psl) 412 count += psl->sl_max; 413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 414 if (!newpsl) { 415 err = -ENOBUFS; 416 goto done; 417 } 418 newpsl->sl_max = count; 419 newpsl->sl_count = count - IP6_SFBLOCK; 420 if (psl) { 421 for (i = 0; i < psl->sl_count; i++) 422 newpsl->sl_addr[i] = psl->sl_addr[i]; 423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 424 } 425 pmc->sflist = psl = newpsl; 426 } 427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 428 for (i = 0; i < psl->sl_count; i++) { 429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 430 if (rv == 0) /* There is an error in the address. */ 431 goto done; 432 } 433 for (j = psl->sl_count-1; j >= i; j--) 434 psl->sl_addr[j+1] = psl->sl_addr[j]; 435 psl->sl_addr[i] = *source; 436 psl->sl_count++; 437 err = 0; 438 /* update the interface list */ 439 ip6_mc_add_src(idev, group, omode, 1, source, 1); 440 done: 441 if (pmclocked) 442 write_unlock(&pmc->sflock); 443 read_unlock_bh(&idev->lock); 444 rcu_read_unlock(); 445 if (leavegroup) 446 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 447 return err; 448 } 449 450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 451 { 452 const struct in6_addr *group; 453 struct ipv6_mc_socklist *pmc; 454 struct inet6_dev *idev; 455 struct ipv6_pinfo *inet6 = inet6_sk(sk); 456 struct ip6_sf_socklist *newpsl, *psl; 457 struct net *net = sock_net(sk); 458 int leavegroup = 0; 459 int i, err; 460 461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 462 463 if (!ipv6_addr_is_multicast(group)) 464 return -EINVAL; 465 if (gsf->gf_fmode != MCAST_INCLUDE && 466 gsf->gf_fmode != MCAST_EXCLUDE) 467 return -EINVAL; 468 469 rcu_read_lock(); 470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 471 472 if (!idev) { 473 rcu_read_unlock(); 474 return -ENODEV; 475 } 476 477 err = 0; 478 479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 480 leavegroup = 1; 481 goto done; 482 } 483 484 for_each_pmc_rcu(inet6, pmc) { 485 if (pmc->ifindex != gsf->gf_interface) 486 continue; 487 if (ipv6_addr_equal(&pmc->addr, group)) 488 break; 489 } 490 if (!pmc) { /* must have a prior join */ 491 err = -EINVAL; 492 goto done; 493 } 494 if (gsf->gf_numsrc) { 495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 496 GFP_ATOMIC); 497 if (!newpsl) { 498 err = -ENOBUFS; 499 goto done; 500 } 501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 502 for (i = 0; i < newpsl->sl_count; ++i) { 503 struct sockaddr_in6 *psin6; 504 505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 506 newpsl->sl_addr[i] = psin6->sin6_addr; 507 } 508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 509 newpsl->sl_count, newpsl->sl_addr, 0); 510 if (err) { 511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 512 goto done; 513 } 514 } else { 515 newpsl = NULL; 516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 517 } 518 519 write_lock(&pmc->sflock); 520 psl = pmc->sflist; 521 if (psl) { 522 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 523 psl->sl_count, psl->sl_addr, 0); 524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 525 } else 526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 527 pmc->sflist = newpsl; 528 pmc->sfmode = gsf->gf_fmode; 529 write_unlock(&pmc->sflock); 530 err = 0; 531 done: 532 read_unlock_bh(&idev->lock); 533 rcu_read_unlock(); 534 if (leavegroup) 535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 536 return err; 537 } 538 539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 540 struct group_filter __user *optval, int __user *optlen) 541 { 542 int err, i, count, copycount; 543 const struct in6_addr *group; 544 struct ipv6_mc_socklist *pmc; 545 struct inet6_dev *idev; 546 struct ipv6_pinfo *inet6 = inet6_sk(sk); 547 struct ip6_sf_socklist *psl; 548 struct net *net = sock_net(sk); 549 550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 551 552 if (!ipv6_addr_is_multicast(group)) 553 return -EINVAL; 554 555 rcu_read_lock(); 556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 557 558 if (!idev) { 559 rcu_read_unlock(); 560 return -ENODEV; 561 } 562 563 err = -EADDRNOTAVAIL; 564 /* changes to the ipv6_mc_list require the socket lock and 565 * rtnl lock. We have the socket lock and rcu read lock, 566 * so reading the list is safe. 567 */ 568 569 for_each_pmc_rcu(inet6, pmc) { 570 if (pmc->ifindex != gsf->gf_interface) 571 continue; 572 if (ipv6_addr_equal(group, &pmc->addr)) 573 break; 574 } 575 if (!pmc) /* must have a prior join */ 576 goto done; 577 gsf->gf_fmode = pmc->sfmode; 578 psl = pmc->sflist; 579 count = psl ? psl->sl_count : 0; 580 read_unlock_bh(&idev->lock); 581 rcu_read_unlock(); 582 583 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 584 gsf->gf_numsrc = count; 585 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 586 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 587 return -EFAULT; 588 } 589 /* changes to psl require the socket lock, and a write lock 590 * on pmc->sflock. We have the socket lock so reading here is safe. 591 */ 592 for (i = 0; i < copycount; i++) { 593 struct sockaddr_in6 *psin6; 594 struct sockaddr_storage ss; 595 596 psin6 = (struct sockaddr_in6 *)&ss; 597 memset(&ss, 0, sizeof(ss)); 598 psin6->sin6_family = AF_INET6; 599 psin6->sin6_addr = psl->sl_addr[i]; 600 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 601 return -EFAULT; 602 } 603 return 0; 604 done: 605 read_unlock_bh(&idev->lock); 606 rcu_read_unlock(); 607 return err; 608 } 609 610 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 611 const struct in6_addr *src_addr) 612 { 613 struct ipv6_pinfo *np = inet6_sk(sk); 614 struct ipv6_mc_socklist *mc; 615 struct ip6_sf_socklist *psl; 616 bool rv = true; 617 618 rcu_read_lock(); 619 for_each_pmc_rcu(np, mc) { 620 if (ipv6_addr_equal(&mc->addr, mc_addr)) 621 break; 622 } 623 if (!mc) { 624 rcu_read_unlock(); 625 return true; 626 } 627 read_lock(&mc->sflock); 628 psl = mc->sflist; 629 if (!psl) { 630 rv = mc->sfmode == MCAST_EXCLUDE; 631 } else { 632 int i; 633 634 for (i = 0; i < psl->sl_count; i++) { 635 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 636 break; 637 } 638 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 639 rv = false; 640 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 641 rv = false; 642 } 643 read_unlock(&mc->sflock); 644 rcu_read_unlock(); 645 646 return rv; 647 } 648 649 static void igmp6_group_added(struct ifmcaddr6 *mc) 650 { 651 struct net_device *dev = mc->idev->dev; 652 char buf[MAX_ADDR_LEN]; 653 654 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 655 IPV6_ADDR_SCOPE_LINKLOCAL) 656 return; 657 658 spin_lock_bh(&mc->mca_lock); 659 if (!(mc->mca_flags&MAF_LOADED)) { 660 mc->mca_flags |= MAF_LOADED; 661 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 662 dev_mc_add(dev, buf); 663 } 664 spin_unlock_bh(&mc->mca_lock); 665 666 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 667 return; 668 669 if (mld_in_v1_mode(mc->idev)) { 670 igmp6_join_group(mc); 671 return; 672 } 673 /* else v2 */ 674 675 mc->mca_crcount = mc->idev->mc_qrv; 676 mld_ifc_event(mc->idev); 677 } 678 679 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 680 { 681 struct net_device *dev = mc->idev->dev; 682 char buf[MAX_ADDR_LEN]; 683 684 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 685 IPV6_ADDR_SCOPE_LINKLOCAL) 686 return; 687 688 spin_lock_bh(&mc->mca_lock); 689 if (mc->mca_flags&MAF_LOADED) { 690 mc->mca_flags &= ~MAF_LOADED; 691 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 692 dev_mc_del(dev, buf); 693 } 694 695 spin_unlock_bh(&mc->mca_lock); 696 if (mc->mca_flags & MAF_NOREPORT) 697 return; 698 699 if (!mc->idev->dead) 700 igmp6_leave_group(mc); 701 702 spin_lock_bh(&mc->mca_lock); 703 if (del_timer(&mc->mca_timer)) 704 atomic_dec(&mc->mca_refcnt); 705 spin_unlock_bh(&mc->mca_lock); 706 } 707 708 /* 709 * deleted ifmcaddr6 manipulation 710 */ 711 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 712 { 713 struct ifmcaddr6 *pmc; 714 715 /* this is an "ifmcaddr6" for convenience; only the fields below 716 * are actually used. In particular, the refcnt and users are not 717 * used for management of the delete list. Using the same structure 718 * for deleted items allows change reports to use common code with 719 * non-deleted or query-response MCA's. 720 */ 721 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 722 if (!pmc) 723 return; 724 725 spin_lock_bh(&im->mca_lock); 726 spin_lock_init(&pmc->mca_lock); 727 pmc->idev = im->idev; 728 in6_dev_hold(idev); 729 pmc->mca_addr = im->mca_addr; 730 pmc->mca_crcount = idev->mc_qrv; 731 pmc->mca_sfmode = im->mca_sfmode; 732 if (pmc->mca_sfmode == MCAST_INCLUDE) { 733 struct ip6_sf_list *psf; 734 735 pmc->mca_tomb = im->mca_tomb; 736 pmc->mca_sources = im->mca_sources; 737 im->mca_tomb = im->mca_sources = NULL; 738 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 739 psf->sf_crcount = pmc->mca_crcount; 740 } 741 spin_unlock_bh(&im->mca_lock); 742 743 spin_lock_bh(&idev->mc_lock); 744 pmc->next = idev->mc_tomb; 745 idev->mc_tomb = pmc; 746 spin_unlock_bh(&idev->mc_lock); 747 } 748 749 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 750 { 751 struct ifmcaddr6 *pmc, *pmc_prev; 752 struct ip6_sf_list *psf; 753 struct in6_addr *pmca = &im->mca_addr; 754 755 spin_lock_bh(&idev->mc_lock); 756 pmc_prev = NULL; 757 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) { 758 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 759 break; 760 pmc_prev = pmc; 761 } 762 if (pmc) { 763 if (pmc_prev) 764 pmc_prev->next = pmc->next; 765 else 766 idev->mc_tomb = pmc->next; 767 } 768 spin_unlock_bh(&idev->mc_lock); 769 770 spin_lock_bh(&im->mca_lock); 771 if (pmc) { 772 im->idev = pmc->idev; 773 im->mca_crcount = idev->mc_qrv; 774 im->mca_sfmode = pmc->mca_sfmode; 775 if (pmc->mca_sfmode == MCAST_INCLUDE) { 776 im->mca_tomb = pmc->mca_tomb; 777 im->mca_sources = pmc->mca_sources; 778 for (psf = im->mca_sources; psf; psf = psf->sf_next) 779 psf->sf_crcount = im->mca_crcount; 780 } 781 in6_dev_put(pmc->idev); 782 } 783 spin_unlock_bh(&im->mca_lock); 784 } 785 786 static void mld_clear_delrec(struct inet6_dev *idev) 787 { 788 struct ifmcaddr6 *pmc, *nextpmc; 789 790 spin_lock_bh(&idev->mc_lock); 791 pmc = idev->mc_tomb; 792 idev->mc_tomb = NULL; 793 spin_unlock_bh(&idev->mc_lock); 794 795 for (; pmc; pmc = nextpmc) { 796 nextpmc = pmc->next; 797 ip6_mc_clear_src(pmc); 798 in6_dev_put(pmc->idev); 799 kfree(pmc); 800 } 801 802 /* clear dead sources, too */ 803 read_lock_bh(&idev->lock); 804 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 805 struct ip6_sf_list *psf, *psf_next; 806 807 spin_lock_bh(&pmc->mca_lock); 808 psf = pmc->mca_tomb; 809 pmc->mca_tomb = NULL; 810 spin_unlock_bh(&pmc->mca_lock); 811 for (; psf; psf = psf_next) { 812 psf_next = psf->sf_next; 813 kfree(psf); 814 } 815 } 816 read_unlock_bh(&idev->lock); 817 } 818 819 static void mca_get(struct ifmcaddr6 *mc) 820 { 821 atomic_inc(&mc->mca_refcnt); 822 } 823 824 static void ma_put(struct ifmcaddr6 *mc) 825 { 826 if (atomic_dec_and_test(&mc->mca_refcnt)) { 827 in6_dev_put(mc->idev); 828 kfree(mc); 829 } 830 } 831 832 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 833 const struct in6_addr *addr) 834 { 835 struct ifmcaddr6 *mc; 836 837 mc = kzalloc(sizeof(*mc), GFP_ATOMIC); 838 if (!mc) 839 return NULL; 840 841 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 842 843 mc->mca_addr = *addr; 844 mc->idev = idev; /* reference taken by caller */ 845 mc->mca_users = 1; 846 /* mca_stamp should be updated upon changes */ 847 mc->mca_cstamp = mc->mca_tstamp = jiffies; 848 atomic_set(&mc->mca_refcnt, 1); 849 spin_lock_init(&mc->mca_lock); 850 851 /* initial mode is (EX, empty) */ 852 mc->mca_sfmode = MCAST_EXCLUDE; 853 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 854 855 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 856 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 857 mc->mca_flags |= MAF_NOREPORT; 858 859 return mc; 860 } 861 862 /* 863 * device multicast group inc (add if not found) 864 */ 865 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 866 { 867 struct ifmcaddr6 *mc; 868 struct inet6_dev *idev; 869 870 ASSERT_RTNL(); 871 872 /* we need to take a reference on idev */ 873 idev = in6_dev_get(dev); 874 875 if (!idev) 876 return -EINVAL; 877 878 write_lock_bh(&idev->lock); 879 if (idev->dead) { 880 write_unlock_bh(&idev->lock); 881 in6_dev_put(idev); 882 return -ENODEV; 883 } 884 885 for (mc = idev->mc_list; mc; mc = mc->next) { 886 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 887 mc->mca_users++; 888 write_unlock_bh(&idev->lock); 889 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 890 NULL, 0); 891 in6_dev_put(idev); 892 return 0; 893 } 894 } 895 896 mc = mca_alloc(idev, addr); 897 if (!mc) { 898 write_unlock_bh(&idev->lock); 899 in6_dev_put(idev); 900 return -ENOMEM; 901 } 902 903 mc->next = idev->mc_list; 904 idev->mc_list = mc; 905 906 /* Hold this for the code below before we unlock, 907 * it is already exposed via idev->mc_list. 908 */ 909 mca_get(mc); 910 write_unlock_bh(&idev->lock); 911 912 mld_del_delrec(idev, mc); 913 igmp6_group_added(mc); 914 ma_put(mc); 915 return 0; 916 } 917 918 /* 919 * device multicast group del 920 */ 921 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 922 { 923 struct ifmcaddr6 *ma, **map; 924 925 ASSERT_RTNL(); 926 927 write_lock_bh(&idev->lock); 928 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) { 929 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 930 if (--ma->mca_users == 0) { 931 *map = ma->next; 932 write_unlock_bh(&idev->lock); 933 934 igmp6_group_dropped(ma); 935 ip6_mc_clear_src(ma); 936 937 ma_put(ma); 938 return 0; 939 } 940 write_unlock_bh(&idev->lock); 941 return 0; 942 } 943 } 944 write_unlock_bh(&idev->lock); 945 946 return -ENOENT; 947 } 948 949 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 950 { 951 struct inet6_dev *idev; 952 int err; 953 954 ASSERT_RTNL(); 955 956 idev = __in6_dev_get(dev); 957 if (!idev) 958 err = -ENODEV; 959 else 960 err = __ipv6_dev_mc_dec(idev, addr); 961 962 return err; 963 } 964 965 /* 966 * check if the interface/address pair is valid 967 */ 968 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 969 const struct in6_addr *src_addr) 970 { 971 struct inet6_dev *idev; 972 struct ifmcaddr6 *mc; 973 bool rv = false; 974 975 rcu_read_lock(); 976 idev = __in6_dev_get(dev); 977 if (idev) { 978 read_lock_bh(&idev->lock); 979 for (mc = idev->mc_list; mc; mc = mc->next) { 980 if (ipv6_addr_equal(&mc->mca_addr, group)) 981 break; 982 } 983 if (mc) { 984 if (src_addr && !ipv6_addr_any(src_addr)) { 985 struct ip6_sf_list *psf; 986 987 spin_lock_bh(&mc->mca_lock); 988 for (psf = mc->mca_sources; psf; psf = psf->sf_next) { 989 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 990 break; 991 } 992 if (psf) 993 rv = psf->sf_count[MCAST_INCLUDE] || 994 psf->sf_count[MCAST_EXCLUDE] != 995 mc->mca_sfcount[MCAST_EXCLUDE]; 996 else 997 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; 998 spin_unlock_bh(&mc->mca_lock); 999 } else 1000 rv = true; /* don't filter unspecified source */ 1001 } 1002 read_unlock_bh(&idev->lock); 1003 } 1004 rcu_read_unlock(); 1005 return rv; 1006 } 1007 1008 static void mld_gq_start_timer(struct inet6_dev *idev) 1009 { 1010 unsigned long tv = prandom_u32() % idev->mc_maxdelay; 1011 1012 idev->mc_gq_running = 1; 1013 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1014 in6_dev_hold(idev); 1015 } 1016 1017 static void mld_gq_stop_timer(struct inet6_dev *idev) 1018 { 1019 idev->mc_gq_running = 0; 1020 if (del_timer(&idev->mc_gq_timer)) 1021 __in6_dev_put(idev); 1022 } 1023 1024 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) 1025 { 1026 unsigned long tv = prandom_u32() % delay; 1027 1028 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1029 in6_dev_hold(idev); 1030 } 1031 1032 static void mld_ifc_stop_timer(struct inet6_dev *idev) 1033 { 1034 idev->mc_ifc_count = 0; 1035 if (del_timer(&idev->mc_ifc_timer)) 1036 __in6_dev_put(idev); 1037 } 1038 1039 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) 1040 { 1041 unsigned long tv = prandom_u32() % delay; 1042 1043 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) 1044 in6_dev_hold(idev); 1045 } 1046 1047 static void mld_dad_stop_timer(struct inet6_dev *idev) 1048 { 1049 if (del_timer(&idev->mc_dad_timer)) 1050 __in6_dev_put(idev); 1051 } 1052 1053 /* 1054 * IGMP handling (alias multicast ICMPv6 messages) 1055 */ 1056 1057 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1058 { 1059 unsigned long delay = resptime; 1060 1061 /* Do not start timer for these addresses */ 1062 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1063 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1064 return; 1065 1066 if (del_timer(&ma->mca_timer)) { 1067 atomic_dec(&ma->mca_refcnt); 1068 delay = ma->mca_timer.expires - jiffies; 1069 } 1070 1071 if (delay >= resptime) 1072 delay = prandom_u32() % resptime; 1073 1074 ma->mca_timer.expires = jiffies + delay; 1075 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1076 atomic_inc(&ma->mca_refcnt); 1077 ma->mca_flags |= MAF_TIMER_RUNNING; 1078 } 1079 1080 /* mark EXCLUDE-mode sources */ 1081 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1082 const struct in6_addr *srcs) 1083 { 1084 struct ip6_sf_list *psf; 1085 int i, scount; 1086 1087 scount = 0; 1088 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1089 if (scount == nsrcs) 1090 break; 1091 for (i = 0; i < nsrcs; i++) { 1092 /* skip inactive filters */ 1093 if (psf->sf_count[MCAST_INCLUDE] || 1094 pmc->mca_sfcount[MCAST_EXCLUDE] != 1095 psf->sf_count[MCAST_EXCLUDE]) 1096 break; 1097 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1098 scount++; 1099 break; 1100 } 1101 } 1102 } 1103 pmc->mca_flags &= ~MAF_GSQUERY; 1104 if (scount == nsrcs) /* all sources excluded */ 1105 return false; 1106 return true; 1107 } 1108 1109 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1110 const struct in6_addr *srcs) 1111 { 1112 struct ip6_sf_list *psf; 1113 int i, scount; 1114 1115 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1116 return mld_xmarksources(pmc, nsrcs, srcs); 1117 1118 /* mark INCLUDE-mode sources */ 1119 1120 scount = 0; 1121 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1122 if (scount == nsrcs) 1123 break; 1124 for (i = 0; i < nsrcs; i++) { 1125 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1126 psf->sf_gsresp = 1; 1127 scount++; 1128 break; 1129 } 1130 } 1131 } 1132 if (!scount) { 1133 pmc->mca_flags &= ~MAF_GSQUERY; 1134 return false; 1135 } 1136 pmc->mca_flags |= MAF_GSQUERY; 1137 return true; 1138 } 1139 1140 static int mld_force_mld_version(const struct inet6_dev *idev) 1141 { 1142 /* Normally, both are 0 here. If enforcement to a particular is 1143 * being used, individual device enforcement will have a lower 1144 * precedence over 'all' device (.../conf/all/force_mld_version). 1145 */ 1146 1147 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1148 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1149 else 1150 return idev->cnf.force_mld_version; 1151 } 1152 1153 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1154 { 1155 return mld_force_mld_version(idev) == 2; 1156 } 1157 1158 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1159 { 1160 return mld_force_mld_version(idev) == 1; 1161 } 1162 1163 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1164 { 1165 if (mld_in_v2_mode_only(idev)) 1166 return false; 1167 if (mld_in_v1_mode_only(idev)) 1168 return true; 1169 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1170 return true; 1171 1172 return false; 1173 } 1174 1175 static void mld_set_v1_mode(struct inet6_dev *idev) 1176 { 1177 /* RFC3810, relevant sections: 1178 * - 9.1. Robustness Variable 1179 * - 9.2. Query Interval 1180 * - 9.3. Query Response Interval 1181 * - 9.12. Older Version Querier Present Timeout 1182 */ 1183 unsigned long switchback; 1184 1185 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1186 1187 idev->mc_v1_seen = jiffies + switchback; 1188 } 1189 1190 static void mld_update_qrv(struct inet6_dev *idev, 1191 const struct mld2_query *mlh2) 1192 { 1193 /* RFC3810, relevant sections: 1194 * - 5.1.8. QRV (Querier's Robustness Variable) 1195 * - 9.1. Robustness Variable 1196 */ 1197 1198 /* The value of the Robustness Variable MUST NOT be zero, 1199 * and SHOULD NOT be one. Catch this here if we ever run 1200 * into such a case in future. 1201 */ 1202 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1203 WARN_ON(idev->mc_qrv == 0); 1204 1205 if (mlh2->mld2q_qrv > 0) 1206 idev->mc_qrv = mlh2->mld2q_qrv; 1207 1208 if (unlikely(idev->mc_qrv < min_qrv)) { 1209 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1210 idev->mc_qrv, min_qrv); 1211 idev->mc_qrv = min_qrv; 1212 } 1213 } 1214 1215 static void mld_update_qi(struct inet6_dev *idev, 1216 const struct mld2_query *mlh2) 1217 { 1218 /* RFC3810, relevant sections: 1219 * - 5.1.9. QQIC (Querier's Query Interval Code) 1220 * - 9.2. Query Interval 1221 * - 9.12. Older Version Querier Present Timeout 1222 * (the [Query Interval] in the last Query received) 1223 */ 1224 unsigned long mc_qqi; 1225 1226 if (mlh2->mld2q_qqic < 128) { 1227 mc_qqi = mlh2->mld2q_qqic; 1228 } else { 1229 unsigned long mc_man, mc_exp; 1230 1231 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1232 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1233 1234 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1235 } 1236 1237 idev->mc_qi = mc_qqi * HZ; 1238 } 1239 1240 static void mld_update_qri(struct inet6_dev *idev, 1241 const struct mld2_query *mlh2) 1242 { 1243 /* RFC3810, relevant sections: 1244 * - 5.1.3. Maximum Response Code 1245 * - 9.3. Query Response Interval 1246 */ 1247 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1248 } 1249 1250 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1251 unsigned long *max_delay, bool v1_query) 1252 { 1253 unsigned long mldv1_md; 1254 1255 /* Ignore v1 queries */ 1256 if (mld_in_v2_mode_only(idev)) 1257 return -EINVAL; 1258 1259 mldv1_md = ntohs(mld->mld_maxdelay); 1260 1261 /* When in MLDv1 fallback and a MLDv2 router start-up being 1262 * unaware of current MLDv1 operation, the MRC == MRD mapping 1263 * only works when the exponential algorithm is not being 1264 * used (as MLDv1 is unaware of such things). 1265 * 1266 * According to the RFC author, the MLDv2 implementations 1267 * he's aware of all use a MRC < 32768 on start up queries. 1268 * 1269 * Thus, should we *ever* encounter something else larger 1270 * than that, just assume the maximum possible within our 1271 * reach. 1272 */ 1273 if (!v1_query) 1274 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1275 1276 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1277 1278 /* MLDv1 router present: we need to go into v1 mode *only* 1279 * when an MLDv1 query is received as per section 9.12. of 1280 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1281 * queries MUST be of exactly 24 octets. 1282 */ 1283 if (v1_query) 1284 mld_set_v1_mode(idev); 1285 1286 /* cancel MLDv2 report timer */ 1287 mld_gq_stop_timer(idev); 1288 /* cancel the interface change timer */ 1289 mld_ifc_stop_timer(idev); 1290 /* clear deleted report items */ 1291 mld_clear_delrec(idev); 1292 1293 return 0; 1294 } 1295 1296 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1297 unsigned long *max_delay) 1298 { 1299 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1300 1301 mld_update_qrv(idev, mld); 1302 mld_update_qi(idev, mld); 1303 mld_update_qri(idev, mld); 1304 1305 idev->mc_maxdelay = *max_delay; 1306 1307 return 0; 1308 } 1309 1310 /* called with rcu_read_lock() */ 1311 int igmp6_event_query(struct sk_buff *skb) 1312 { 1313 struct mld2_query *mlh2 = NULL; 1314 struct ifmcaddr6 *ma; 1315 const struct in6_addr *group; 1316 unsigned long max_delay; 1317 struct inet6_dev *idev; 1318 struct mld_msg *mld; 1319 int group_type; 1320 int mark = 0; 1321 int len, err; 1322 1323 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1324 return -EINVAL; 1325 1326 /* compute payload length excluding extension headers */ 1327 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1328 len -= skb_network_header_len(skb); 1329 1330 /* RFC3810 6.2 1331 * Upon reception of an MLD message that contains a Query, the node 1332 * checks if the source address of the message is a valid link-local 1333 * address, if the Hop Limit is set to 1, and if the Router Alert 1334 * option is present in the Hop-By-Hop Options header of the IPv6 1335 * packet. If any of these checks fails, the packet is dropped. 1336 */ 1337 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1338 ipv6_hdr(skb)->hop_limit != 1 || 1339 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1340 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1341 return -EINVAL; 1342 1343 idev = __in6_dev_get(skb->dev); 1344 if (!idev) 1345 return 0; 1346 1347 mld = (struct mld_msg *)icmp6_hdr(skb); 1348 group = &mld->mld_mca; 1349 group_type = ipv6_addr_type(group); 1350 1351 if (group_type != IPV6_ADDR_ANY && 1352 !(group_type&IPV6_ADDR_MULTICAST)) 1353 return -EINVAL; 1354 1355 if (len < MLD_V1_QUERY_LEN) { 1356 return -EINVAL; 1357 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1358 err = mld_process_v1(idev, mld, &max_delay, 1359 len == MLD_V1_QUERY_LEN); 1360 if (err < 0) 1361 return err; 1362 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1363 int srcs_offset = sizeof(struct mld2_query) - 1364 sizeof(struct icmp6hdr); 1365 1366 if (!pskb_may_pull(skb, srcs_offset)) 1367 return -EINVAL; 1368 1369 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1370 1371 err = mld_process_v2(idev, mlh2, &max_delay); 1372 if (err < 0) 1373 return err; 1374 1375 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1376 if (mlh2->mld2q_nsrcs) 1377 return -EINVAL; /* no sources allowed */ 1378 1379 mld_gq_start_timer(idev); 1380 return 0; 1381 } 1382 /* mark sources to include, if group & source-specific */ 1383 if (mlh2->mld2q_nsrcs != 0) { 1384 if (!pskb_may_pull(skb, srcs_offset + 1385 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1386 return -EINVAL; 1387 1388 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1389 mark = 1; 1390 } 1391 } else { 1392 return -EINVAL; 1393 } 1394 1395 read_lock_bh(&idev->lock); 1396 if (group_type == IPV6_ADDR_ANY) { 1397 for (ma = idev->mc_list; ma; ma = ma->next) { 1398 spin_lock_bh(&ma->mca_lock); 1399 igmp6_group_queried(ma, max_delay); 1400 spin_unlock_bh(&ma->mca_lock); 1401 } 1402 } else { 1403 for (ma = idev->mc_list; ma; ma = ma->next) { 1404 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1405 continue; 1406 spin_lock_bh(&ma->mca_lock); 1407 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1408 /* gsquery <- gsquery && mark */ 1409 if (!mark) 1410 ma->mca_flags &= ~MAF_GSQUERY; 1411 } else { 1412 /* gsquery <- mark */ 1413 if (mark) 1414 ma->mca_flags |= MAF_GSQUERY; 1415 else 1416 ma->mca_flags &= ~MAF_GSQUERY; 1417 } 1418 if (!(ma->mca_flags & MAF_GSQUERY) || 1419 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1420 igmp6_group_queried(ma, max_delay); 1421 spin_unlock_bh(&ma->mca_lock); 1422 break; 1423 } 1424 } 1425 read_unlock_bh(&idev->lock); 1426 1427 return 0; 1428 } 1429 1430 /* called with rcu_read_lock() */ 1431 int igmp6_event_report(struct sk_buff *skb) 1432 { 1433 struct ifmcaddr6 *ma; 1434 struct inet6_dev *idev; 1435 struct mld_msg *mld; 1436 int addr_type; 1437 1438 /* Our own report looped back. Ignore it. */ 1439 if (skb->pkt_type == PACKET_LOOPBACK) 1440 return 0; 1441 1442 /* send our report if the MC router may not have heard this report */ 1443 if (skb->pkt_type != PACKET_MULTICAST && 1444 skb->pkt_type != PACKET_BROADCAST) 1445 return 0; 1446 1447 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1448 return -EINVAL; 1449 1450 mld = (struct mld_msg *)icmp6_hdr(skb); 1451 1452 /* Drop reports with not link local source */ 1453 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1454 if (addr_type != IPV6_ADDR_ANY && 1455 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1456 return -EINVAL; 1457 1458 idev = __in6_dev_get(skb->dev); 1459 if (!idev) 1460 return -ENODEV; 1461 1462 /* 1463 * Cancel the timer for this group 1464 */ 1465 1466 read_lock_bh(&idev->lock); 1467 for (ma = idev->mc_list; ma; ma = ma->next) { 1468 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1469 spin_lock(&ma->mca_lock); 1470 if (del_timer(&ma->mca_timer)) 1471 atomic_dec(&ma->mca_refcnt); 1472 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1473 spin_unlock(&ma->mca_lock); 1474 break; 1475 } 1476 } 1477 read_unlock_bh(&idev->lock); 1478 return 0; 1479 } 1480 1481 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1482 int gdeleted, int sdeleted) 1483 { 1484 switch (type) { 1485 case MLD2_MODE_IS_INCLUDE: 1486 case MLD2_MODE_IS_EXCLUDE: 1487 if (gdeleted || sdeleted) 1488 return false; 1489 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1490 if (pmc->mca_sfmode == MCAST_INCLUDE) 1491 return true; 1492 /* don't include if this source is excluded 1493 * in all filters 1494 */ 1495 if (psf->sf_count[MCAST_INCLUDE]) 1496 return type == MLD2_MODE_IS_INCLUDE; 1497 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1498 psf->sf_count[MCAST_EXCLUDE]; 1499 } 1500 return false; 1501 case MLD2_CHANGE_TO_INCLUDE: 1502 if (gdeleted || sdeleted) 1503 return false; 1504 return psf->sf_count[MCAST_INCLUDE] != 0; 1505 case MLD2_CHANGE_TO_EXCLUDE: 1506 if (gdeleted || sdeleted) 1507 return false; 1508 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1509 psf->sf_count[MCAST_INCLUDE]) 1510 return false; 1511 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1512 psf->sf_count[MCAST_EXCLUDE]; 1513 case MLD2_ALLOW_NEW_SOURCES: 1514 if (gdeleted || !psf->sf_crcount) 1515 return false; 1516 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1517 case MLD2_BLOCK_OLD_SOURCES: 1518 if (pmc->mca_sfmode == MCAST_INCLUDE) 1519 return gdeleted || (psf->sf_crcount && sdeleted); 1520 return psf->sf_crcount && !gdeleted && !sdeleted; 1521 } 1522 return false; 1523 } 1524 1525 static int 1526 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1527 { 1528 struct ip6_sf_list *psf; 1529 int scount = 0; 1530 1531 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1532 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1533 continue; 1534 scount++; 1535 } 1536 return scount; 1537 } 1538 1539 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1540 struct net_device *dev, 1541 const struct in6_addr *saddr, 1542 const struct in6_addr *daddr, 1543 int proto, int len) 1544 { 1545 struct ipv6hdr *hdr; 1546 1547 skb->protocol = htons(ETH_P_IPV6); 1548 skb->dev = dev; 1549 1550 skb_reset_network_header(skb); 1551 skb_put(skb, sizeof(struct ipv6hdr)); 1552 hdr = ipv6_hdr(skb); 1553 1554 ip6_flow_hdr(hdr, 0, 0); 1555 1556 hdr->payload_len = htons(len); 1557 hdr->nexthdr = proto; 1558 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1559 1560 hdr->saddr = *saddr; 1561 hdr->daddr = *daddr; 1562 } 1563 1564 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1565 { 1566 struct net_device *dev = idev->dev; 1567 struct net *net = dev_net(dev); 1568 struct sock *sk = net->ipv6.igmp_sk; 1569 struct sk_buff *skb; 1570 struct mld2_report *pmr; 1571 struct in6_addr addr_buf; 1572 const struct in6_addr *saddr; 1573 int hlen = LL_RESERVED_SPACE(dev); 1574 int tlen = dev->needed_tailroom; 1575 unsigned int size = mtu + hlen + tlen; 1576 int err; 1577 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1578 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1579 IPV6_TLV_PADN, 0 }; 1580 1581 /* we assume size > sizeof(ra) here */ 1582 /* limit our allocations to order-0 page */ 1583 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1584 skb = sock_alloc_send_skb(sk, size, 1, &err); 1585 1586 if (!skb) 1587 return NULL; 1588 1589 skb->priority = TC_PRIO_CONTROL; 1590 skb_reserve(skb, hlen); 1591 skb_tailroom_reserve(skb, mtu, tlen); 1592 1593 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1594 /* <draft-ietf-magma-mld-source-05.txt>: 1595 * use unspecified address as the source address 1596 * when a valid link-local address is not available. 1597 */ 1598 saddr = &in6addr_any; 1599 } else 1600 saddr = &addr_buf; 1601 1602 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1603 1604 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1605 1606 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1607 skb_put(skb, sizeof(*pmr)); 1608 pmr = (struct mld2_report *)skb_transport_header(skb); 1609 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1610 pmr->mld2r_resv1 = 0; 1611 pmr->mld2r_cksum = 0; 1612 pmr->mld2r_resv2 = 0; 1613 pmr->mld2r_ngrec = 0; 1614 return skb; 1615 } 1616 1617 static void mld_sendpack(struct sk_buff *skb) 1618 { 1619 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1620 struct mld2_report *pmr = 1621 (struct mld2_report *)skb_transport_header(skb); 1622 int payload_len, mldlen; 1623 struct inet6_dev *idev; 1624 struct net *net = dev_net(skb->dev); 1625 int err; 1626 struct flowi6 fl6; 1627 struct dst_entry *dst; 1628 1629 rcu_read_lock(); 1630 idev = __in6_dev_get(skb->dev); 1631 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1632 1633 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1634 sizeof(*pip6); 1635 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1636 pip6->payload_len = htons(payload_len); 1637 1638 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1639 IPPROTO_ICMPV6, 1640 csum_partial(skb_transport_header(skb), 1641 mldlen, 0)); 1642 1643 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1644 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1645 skb->dev->ifindex); 1646 dst = icmp6_dst_alloc(skb->dev, &fl6); 1647 1648 err = 0; 1649 if (IS_ERR(dst)) { 1650 err = PTR_ERR(dst); 1651 dst = NULL; 1652 } 1653 skb_dst_set(skb, dst); 1654 if (err) 1655 goto err_out; 1656 1657 payload_len = skb->len; 1658 1659 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1660 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1661 dst_output); 1662 out: 1663 if (!err) { 1664 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1665 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1666 } else { 1667 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1668 } 1669 1670 rcu_read_unlock(); 1671 return; 1672 1673 err_out: 1674 kfree_skb(skb); 1675 goto out; 1676 } 1677 1678 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1679 { 1680 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1681 } 1682 1683 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1684 int type, struct mld2_grec **ppgr) 1685 { 1686 struct net_device *dev = pmc->idev->dev; 1687 struct mld2_report *pmr; 1688 struct mld2_grec *pgr; 1689 1690 if (!skb) 1691 skb = mld_newpack(pmc->idev, dev->mtu); 1692 if (!skb) 1693 return NULL; 1694 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1695 pgr->grec_type = type; 1696 pgr->grec_auxwords = 0; 1697 pgr->grec_nsrcs = 0; 1698 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1699 pmr = (struct mld2_report *)skb_transport_header(skb); 1700 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1701 *ppgr = pgr; 1702 return skb; 1703 } 1704 1705 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1706 1707 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1708 int type, int gdeleted, int sdeleted, int crsend) 1709 { 1710 struct inet6_dev *idev = pmc->idev; 1711 struct net_device *dev = idev->dev; 1712 struct mld2_report *pmr; 1713 struct mld2_grec *pgr = NULL; 1714 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1715 int scount, stotal, first, isquery, truncate; 1716 1717 if (pmc->mca_flags & MAF_NOREPORT) 1718 return skb; 1719 1720 isquery = type == MLD2_MODE_IS_INCLUDE || 1721 type == MLD2_MODE_IS_EXCLUDE; 1722 truncate = type == MLD2_MODE_IS_EXCLUDE || 1723 type == MLD2_CHANGE_TO_EXCLUDE; 1724 1725 stotal = scount = 0; 1726 1727 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1728 1729 if (!*psf_list) 1730 goto empty_source; 1731 1732 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1733 1734 /* EX and TO_EX get a fresh packet, if needed */ 1735 if (truncate) { 1736 if (pmr && pmr->mld2r_ngrec && 1737 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1738 if (skb) 1739 mld_sendpack(skb); 1740 skb = mld_newpack(idev, dev->mtu); 1741 } 1742 } 1743 first = 1; 1744 psf_prev = NULL; 1745 for (psf = *psf_list; psf; psf = psf_next) { 1746 struct in6_addr *psrc; 1747 1748 psf_next = psf->sf_next; 1749 1750 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1751 psf_prev = psf; 1752 continue; 1753 } 1754 1755 /* Based on RFC3810 6.1. Should not send source-list change 1756 * records when there is a filter mode change. 1757 */ 1758 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1759 (!gdeleted && pmc->mca_crcount)) && 1760 (type == MLD2_ALLOW_NEW_SOURCES || 1761 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1762 goto decrease_sf_crcount; 1763 1764 /* clear marks on query responses */ 1765 if (isquery) 1766 psf->sf_gsresp = 0; 1767 1768 if (AVAILABLE(skb) < sizeof(*psrc) + 1769 first*sizeof(struct mld2_grec)) { 1770 if (truncate && !first) 1771 break; /* truncate these */ 1772 if (pgr) 1773 pgr->grec_nsrcs = htons(scount); 1774 if (skb) 1775 mld_sendpack(skb); 1776 skb = mld_newpack(idev, dev->mtu); 1777 first = 1; 1778 scount = 0; 1779 } 1780 if (first) { 1781 skb = add_grhead(skb, pmc, type, &pgr); 1782 first = 0; 1783 } 1784 if (!skb) 1785 return NULL; 1786 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1787 *psrc = psf->sf_addr; 1788 scount++; stotal++; 1789 if ((type == MLD2_ALLOW_NEW_SOURCES || 1790 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1791 decrease_sf_crcount: 1792 psf->sf_crcount--; 1793 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1794 if (psf_prev) 1795 psf_prev->sf_next = psf->sf_next; 1796 else 1797 *psf_list = psf->sf_next; 1798 kfree(psf); 1799 continue; 1800 } 1801 } 1802 psf_prev = psf; 1803 } 1804 1805 empty_source: 1806 if (!stotal) { 1807 if (type == MLD2_ALLOW_NEW_SOURCES || 1808 type == MLD2_BLOCK_OLD_SOURCES) 1809 return skb; 1810 if (pmc->mca_crcount || isquery || crsend) { 1811 /* make sure we have room for group header */ 1812 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1813 mld_sendpack(skb); 1814 skb = NULL; /* add_grhead will get a new one */ 1815 } 1816 skb = add_grhead(skb, pmc, type, &pgr); 1817 } 1818 } 1819 if (pgr) 1820 pgr->grec_nsrcs = htons(scount); 1821 1822 if (isquery) 1823 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1824 return skb; 1825 } 1826 1827 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1828 { 1829 struct sk_buff *skb = NULL; 1830 int type; 1831 1832 read_lock_bh(&idev->lock); 1833 if (!pmc) { 1834 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1835 if (pmc->mca_flags & MAF_NOREPORT) 1836 continue; 1837 spin_lock_bh(&pmc->mca_lock); 1838 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1839 type = MLD2_MODE_IS_EXCLUDE; 1840 else 1841 type = MLD2_MODE_IS_INCLUDE; 1842 skb = add_grec(skb, pmc, type, 0, 0, 0); 1843 spin_unlock_bh(&pmc->mca_lock); 1844 } 1845 } else { 1846 spin_lock_bh(&pmc->mca_lock); 1847 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1848 type = MLD2_MODE_IS_EXCLUDE; 1849 else 1850 type = MLD2_MODE_IS_INCLUDE; 1851 skb = add_grec(skb, pmc, type, 0, 0, 0); 1852 spin_unlock_bh(&pmc->mca_lock); 1853 } 1854 read_unlock_bh(&idev->lock); 1855 if (skb) 1856 mld_sendpack(skb); 1857 } 1858 1859 /* 1860 * remove zero-count source records from a source filter list 1861 */ 1862 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1863 { 1864 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1865 1866 psf_prev = NULL; 1867 for (psf = *ppsf; psf; psf = psf_next) { 1868 psf_next = psf->sf_next; 1869 if (psf->sf_crcount == 0) { 1870 if (psf_prev) 1871 psf_prev->sf_next = psf->sf_next; 1872 else 1873 *ppsf = psf->sf_next; 1874 kfree(psf); 1875 } else 1876 psf_prev = psf; 1877 } 1878 } 1879 1880 static void mld_send_cr(struct inet6_dev *idev) 1881 { 1882 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1883 struct sk_buff *skb = NULL; 1884 int type, dtype; 1885 1886 read_lock_bh(&idev->lock); 1887 spin_lock(&idev->mc_lock); 1888 1889 /* deleted MCA's */ 1890 pmc_prev = NULL; 1891 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) { 1892 pmc_next = pmc->next; 1893 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1894 type = MLD2_BLOCK_OLD_SOURCES; 1895 dtype = MLD2_BLOCK_OLD_SOURCES; 1896 skb = add_grec(skb, pmc, type, 1, 0, 0); 1897 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 1898 } 1899 if (pmc->mca_crcount) { 1900 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1901 type = MLD2_CHANGE_TO_INCLUDE; 1902 skb = add_grec(skb, pmc, type, 1, 0, 0); 1903 } 1904 pmc->mca_crcount--; 1905 if (pmc->mca_crcount == 0) { 1906 mld_clear_zeros(&pmc->mca_tomb); 1907 mld_clear_zeros(&pmc->mca_sources); 1908 } 1909 } 1910 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1911 !pmc->mca_sources) { 1912 if (pmc_prev) 1913 pmc_prev->next = pmc_next; 1914 else 1915 idev->mc_tomb = pmc_next; 1916 in6_dev_put(pmc->idev); 1917 kfree(pmc); 1918 } else 1919 pmc_prev = pmc; 1920 } 1921 spin_unlock(&idev->mc_lock); 1922 1923 /* change recs */ 1924 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1925 spin_lock_bh(&pmc->mca_lock); 1926 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1927 type = MLD2_BLOCK_OLD_SOURCES; 1928 dtype = MLD2_ALLOW_NEW_SOURCES; 1929 } else { 1930 type = MLD2_ALLOW_NEW_SOURCES; 1931 dtype = MLD2_BLOCK_OLD_SOURCES; 1932 } 1933 skb = add_grec(skb, pmc, type, 0, 0, 0); 1934 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 1935 1936 /* filter mode changes */ 1937 if (pmc->mca_crcount) { 1938 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1939 type = MLD2_CHANGE_TO_EXCLUDE; 1940 else 1941 type = MLD2_CHANGE_TO_INCLUDE; 1942 skb = add_grec(skb, pmc, type, 0, 0, 0); 1943 pmc->mca_crcount--; 1944 } 1945 spin_unlock_bh(&pmc->mca_lock); 1946 } 1947 read_unlock_bh(&idev->lock); 1948 if (!skb) 1949 return; 1950 (void) mld_sendpack(skb); 1951 } 1952 1953 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1954 { 1955 struct net *net = dev_net(dev); 1956 struct sock *sk = net->ipv6.igmp_sk; 1957 struct inet6_dev *idev; 1958 struct sk_buff *skb; 1959 struct mld_msg *hdr; 1960 const struct in6_addr *snd_addr, *saddr; 1961 struct in6_addr addr_buf; 1962 int hlen = LL_RESERVED_SPACE(dev); 1963 int tlen = dev->needed_tailroom; 1964 int err, len, payload_len, full_len; 1965 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1966 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1967 IPV6_TLV_PADN, 0 }; 1968 struct flowi6 fl6; 1969 struct dst_entry *dst; 1970 1971 if (type == ICMPV6_MGM_REDUCTION) 1972 snd_addr = &in6addr_linklocal_allrouters; 1973 else 1974 snd_addr = addr; 1975 1976 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1977 payload_len = len + sizeof(ra); 1978 full_len = sizeof(struct ipv6hdr) + payload_len; 1979 1980 rcu_read_lock(); 1981 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1982 IPSTATS_MIB_OUT, full_len); 1983 rcu_read_unlock(); 1984 1985 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1986 1987 if (!skb) { 1988 rcu_read_lock(); 1989 IP6_INC_STATS(net, __in6_dev_get(dev), 1990 IPSTATS_MIB_OUTDISCARDS); 1991 rcu_read_unlock(); 1992 return; 1993 } 1994 skb->priority = TC_PRIO_CONTROL; 1995 skb_reserve(skb, hlen); 1996 1997 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1998 /* <draft-ietf-magma-mld-source-05.txt>: 1999 * use unspecified address as the source address 2000 * when a valid link-local address is not available. 2001 */ 2002 saddr = &in6addr_any; 2003 } else 2004 saddr = &addr_buf; 2005 2006 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2007 2008 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 2009 2010 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 2011 memset(hdr, 0, sizeof(struct mld_msg)); 2012 hdr->mld_type = type; 2013 hdr->mld_mca = *addr; 2014 2015 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2016 IPPROTO_ICMPV6, 2017 csum_partial(hdr, len, 0)); 2018 2019 rcu_read_lock(); 2020 idev = __in6_dev_get(skb->dev); 2021 2022 icmpv6_flow_init(sk, &fl6, type, 2023 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2024 skb->dev->ifindex); 2025 dst = icmp6_dst_alloc(skb->dev, &fl6); 2026 if (IS_ERR(dst)) { 2027 err = PTR_ERR(dst); 2028 goto err_out; 2029 } 2030 2031 skb_dst_set(skb, dst); 2032 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2033 net, sk, skb, NULL, skb->dev, 2034 dst_output); 2035 out: 2036 if (!err) { 2037 ICMP6MSGOUT_INC_STATS(net, idev, type); 2038 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2039 } else 2040 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2041 2042 rcu_read_unlock(); 2043 return; 2044 2045 err_out: 2046 kfree_skb(skb); 2047 goto out; 2048 } 2049 2050 static void mld_send_initial_cr(struct inet6_dev *idev) 2051 { 2052 struct sk_buff *skb; 2053 struct ifmcaddr6 *pmc; 2054 int type; 2055 2056 if (mld_in_v1_mode(idev)) 2057 return; 2058 2059 skb = NULL; 2060 read_lock_bh(&idev->lock); 2061 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2062 spin_lock_bh(&pmc->mca_lock); 2063 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2064 type = MLD2_CHANGE_TO_EXCLUDE; 2065 else 2066 type = MLD2_CHANGE_TO_INCLUDE; 2067 skb = add_grec(skb, pmc, type, 0, 0, 1); 2068 spin_unlock_bh(&pmc->mca_lock); 2069 } 2070 read_unlock_bh(&idev->lock); 2071 if (skb) 2072 mld_sendpack(skb); 2073 } 2074 2075 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2076 { 2077 idev->mc_dad_count = idev->mc_qrv; 2078 if (idev->mc_dad_count) { 2079 mld_send_initial_cr(idev); 2080 idev->mc_dad_count--; 2081 if (idev->mc_dad_count) 2082 mld_dad_start_timer(idev, idev->mc_maxdelay); 2083 } 2084 } 2085 2086 static void mld_dad_timer_expire(unsigned long data) 2087 { 2088 struct inet6_dev *idev = (struct inet6_dev *)data; 2089 2090 mld_send_initial_cr(idev); 2091 if (idev->mc_dad_count) { 2092 idev->mc_dad_count--; 2093 if (idev->mc_dad_count) 2094 mld_dad_start_timer(idev, idev->mc_maxdelay); 2095 } 2096 in6_dev_put(idev); 2097 } 2098 2099 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2100 const struct in6_addr *psfsrc) 2101 { 2102 struct ip6_sf_list *psf, *psf_prev; 2103 int rv = 0; 2104 2105 psf_prev = NULL; 2106 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2107 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2108 break; 2109 psf_prev = psf; 2110 } 2111 if (!psf || psf->sf_count[sfmode] == 0) { 2112 /* source filter not found, or count wrong => bug */ 2113 return -ESRCH; 2114 } 2115 psf->sf_count[sfmode]--; 2116 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2117 struct inet6_dev *idev = pmc->idev; 2118 2119 /* no more filters for this source */ 2120 if (psf_prev) 2121 psf_prev->sf_next = psf->sf_next; 2122 else 2123 pmc->mca_sources = psf->sf_next; 2124 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2125 !mld_in_v1_mode(idev)) { 2126 psf->sf_crcount = idev->mc_qrv; 2127 psf->sf_next = pmc->mca_tomb; 2128 pmc->mca_tomb = psf; 2129 rv = 1; 2130 } else 2131 kfree(psf); 2132 } 2133 return rv; 2134 } 2135 2136 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2137 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2138 int delta) 2139 { 2140 struct ifmcaddr6 *pmc; 2141 int changerec = 0; 2142 int i, err; 2143 2144 if (!idev) 2145 return -ENODEV; 2146 read_lock_bh(&idev->lock); 2147 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2148 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2149 break; 2150 } 2151 if (!pmc) { 2152 /* MCA not found?? bug */ 2153 read_unlock_bh(&idev->lock); 2154 return -ESRCH; 2155 } 2156 spin_lock_bh(&pmc->mca_lock); 2157 sf_markstate(pmc); 2158 if (!delta) { 2159 if (!pmc->mca_sfcount[sfmode]) { 2160 spin_unlock_bh(&pmc->mca_lock); 2161 read_unlock_bh(&idev->lock); 2162 return -EINVAL; 2163 } 2164 pmc->mca_sfcount[sfmode]--; 2165 } 2166 err = 0; 2167 for (i = 0; i < sfcount; i++) { 2168 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2169 2170 changerec |= rv > 0; 2171 if (!err && rv < 0) 2172 err = rv; 2173 } 2174 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2175 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2176 pmc->mca_sfcount[MCAST_INCLUDE]) { 2177 struct ip6_sf_list *psf; 2178 2179 /* filter mode change */ 2180 pmc->mca_sfmode = MCAST_INCLUDE; 2181 pmc->mca_crcount = idev->mc_qrv; 2182 idev->mc_ifc_count = pmc->mca_crcount; 2183 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2184 psf->sf_crcount = 0; 2185 mld_ifc_event(pmc->idev); 2186 } else if (sf_setstate(pmc) || changerec) 2187 mld_ifc_event(pmc->idev); 2188 spin_unlock_bh(&pmc->mca_lock); 2189 read_unlock_bh(&idev->lock); 2190 return err; 2191 } 2192 2193 /* 2194 * Add multicast single-source filter to the interface list 2195 */ 2196 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2197 const struct in6_addr *psfsrc) 2198 { 2199 struct ip6_sf_list *psf, *psf_prev; 2200 2201 psf_prev = NULL; 2202 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2203 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2204 break; 2205 psf_prev = psf; 2206 } 2207 if (!psf) { 2208 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 2209 if (!psf) 2210 return -ENOBUFS; 2211 2212 psf->sf_addr = *psfsrc; 2213 if (psf_prev) { 2214 psf_prev->sf_next = psf; 2215 } else 2216 pmc->mca_sources = psf; 2217 } 2218 psf->sf_count[sfmode]++; 2219 return 0; 2220 } 2221 2222 static void sf_markstate(struct ifmcaddr6 *pmc) 2223 { 2224 struct ip6_sf_list *psf; 2225 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2226 2227 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2228 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2229 psf->sf_oldin = mca_xcount == 2230 psf->sf_count[MCAST_EXCLUDE] && 2231 !psf->sf_count[MCAST_INCLUDE]; 2232 } else 2233 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2234 } 2235 2236 static int sf_setstate(struct ifmcaddr6 *pmc) 2237 { 2238 struct ip6_sf_list *psf, *dpsf; 2239 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2240 int qrv = pmc->idev->mc_qrv; 2241 int new_in, rv; 2242 2243 rv = 0; 2244 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2245 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2246 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2247 !psf->sf_count[MCAST_INCLUDE]; 2248 } else 2249 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2250 if (new_in) { 2251 if (!psf->sf_oldin) { 2252 struct ip6_sf_list *prev = NULL; 2253 2254 for (dpsf = pmc->mca_tomb; dpsf; 2255 dpsf = dpsf->sf_next) { 2256 if (ipv6_addr_equal(&dpsf->sf_addr, 2257 &psf->sf_addr)) 2258 break; 2259 prev = dpsf; 2260 } 2261 if (dpsf) { 2262 if (prev) 2263 prev->sf_next = dpsf->sf_next; 2264 else 2265 pmc->mca_tomb = dpsf->sf_next; 2266 kfree(dpsf); 2267 } 2268 psf->sf_crcount = qrv; 2269 rv++; 2270 } 2271 } else if (psf->sf_oldin) { 2272 psf->sf_crcount = 0; 2273 /* 2274 * add or update "delete" records if an active filter 2275 * is now inactive 2276 */ 2277 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next) 2278 if (ipv6_addr_equal(&dpsf->sf_addr, 2279 &psf->sf_addr)) 2280 break; 2281 if (!dpsf) { 2282 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2283 if (!dpsf) 2284 continue; 2285 *dpsf = *psf; 2286 /* pmc->mca_lock held by callers */ 2287 dpsf->sf_next = pmc->mca_tomb; 2288 pmc->mca_tomb = dpsf; 2289 } 2290 dpsf->sf_crcount = qrv; 2291 rv++; 2292 } 2293 } 2294 return rv; 2295 } 2296 2297 /* 2298 * Add multicast source filter list to the interface list 2299 */ 2300 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2301 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2302 int delta) 2303 { 2304 struct ifmcaddr6 *pmc; 2305 int isexclude; 2306 int i, err; 2307 2308 if (!idev) 2309 return -ENODEV; 2310 read_lock_bh(&idev->lock); 2311 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2312 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2313 break; 2314 } 2315 if (!pmc) { 2316 /* MCA not found?? bug */ 2317 read_unlock_bh(&idev->lock); 2318 return -ESRCH; 2319 } 2320 spin_lock_bh(&pmc->mca_lock); 2321 2322 sf_markstate(pmc); 2323 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2324 if (!delta) 2325 pmc->mca_sfcount[sfmode]++; 2326 err = 0; 2327 for (i = 0; i < sfcount; i++) { 2328 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2329 if (err) 2330 break; 2331 } 2332 if (err) { 2333 int j; 2334 2335 if (!delta) 2336 pmc->mca_sfcount[sfmode]--; 2337 for (j = 0; j < i; j++) 2338 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2339 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2340 struct ip6_sf_list *psf; 2341 2342 /* filter mode change */ 2343 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2344 pmc->mca_sfmode = MCAST_EXCLUDE; 2345 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2346 pmc->mca_sfmode = MCAST_INCLUDE; 2347 /* else no filters; keep old mode for reports */ 2348 2349 pmc->mca_crcount = idev->mc_qrv; 2350 idev->mc_ifc_count = pmc->mca_crcount; 2351 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2352 psf->sf_crcount = 0; 2353 mld_ifc_event(idev); 2354 } else if (sf_setstate(pmc)) 2355 mld_ifc_event(idev); 2356 spin_unlock_bh(&pmc->mca_lock); 2357 read_unlock_bh(&idev->lock); 2358 return err; 2359 } 2360 2361 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2362 { 2363 struct ip6_sf_list *psf, *nextpsf; 2364 2365 for (psf = pmc->mca_tomb; psf; psf = nextpsf) { 2366 nextpsf = psf->sf_next; 2367 kfree(psf); 2368 } 2369 pmc->mca_tomb = NULL; 2370 for (psf = pmc->mca_sources; psf; psf = nextpsf) { 2371 nextpsf = psf->sf_next; 2372 kfree(psf); 2373 } 2374 pmc->mca_sources = NULL; 2375 pmc->mca_sfmode = MCAST_EXCLUDE; 2376 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2377 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2378 } 2379 2380 2381 static void igmp6_join_group(struct ifmcaddr6 *ma) 2382 { 2383 unsigned long delay; 2384 2385 if (ma->mca_flags & MAF_NOREPORT) 2386 return; 2387 2388 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2389 2390 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2391 2392 spin_lock_bh(&ma->mca_lock); 2393 if (del_timer(&ma->mca_timer)) { 2394 atomic_dec(&ma->mca_refcnt); 2395 delay = ma->mca_timer.expires - jiffies; 2396 } 2397 2398 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2399 atomic_inc(&ma->mca_refcnt); 2400 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2401 spin_unlock_bh(&ma->mca_lock); 2402 } 2403 2404 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2405 struct inet6_dev *idev) 2406 { 2407 int err; 2408 2409 /* callers have the socket lock and rtnl lock 2410 * so no other readers or writers of iml or its sflist 2411 */ 2412 if (!iml->sflist) { 2413 /* any-source empty exclude case */ 2414 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2415 } 2416 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2417 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2418 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2419 iml->sflist = NULL; 2420 return err; 2421 } 2422 2423 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2424 { 2425 if (mld_in_v1_mode(ma->idev)) { 2426 if (ma->mca_flags & MAF_LAST_REPORTER) 2427 igmp6_send(&ma->mca_addr, ma->idev->dev, 2428 ICMPV6_MGM_REDUCTION); 2429 } else { 2430 mld_add_delrec(ma->idev, ma); 2431 mld_ifc_event(ma->idev); 2432 } 2433 } 2434 2435 static void mld_gq_timer_expire(unsigned long data) 2436 { 2437 struct inet6_dev *idev = (struct inet6_dev *)data; 2438 2439 idev->mc_gq_running = 0; 2440 mld_send_report(idev, NULL); 2441 in6_dev_put(idev); 2442 } 2443 2444 static void mld_ifc_timer_expire(unsigned long data) 2445 { 2446 struct inet6_dev *idev = (struct inet6_dev *)data; 2447 2448 mld_send_cr(idev); 2449 if (idev->mc_ifc_count) { 2450 idev->mc_ifc_count--; 2451 if (idev->mc_ifc_count) 2452 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2453 } 2454 in6_dev_put(idev); 2455 } 2456 2457 static void mld_ifc_event(struct inet6_dev *idev) 2458 { 2459 if (mld_in_v1_mode(idev)) 2460 return; 2461 idev->mc_ifc_count = idev->mc_qrv; 2462 mld_ifc_start_timer(idev, 1); 2463 } 2464 2465 2466 static void igmp6_timer_handler(unsigned long data) 2467 { 2468 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2469 2470 if (mld_in_v1_mode(ma->idev)) 2471 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2472 else 2473 mld_send_report(ma->idev, ma); 2474 2475 spin_lock(&ma->mca_lock); 2476 ma->mca_flags |= MAF_LAST_REPORTER; 2477 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2478 spin_unlock(&ma->mca_lock); 2479 ma_put(ma); 2480 } 2481 2482 /* Device changing type */ 2483 2484 void ipv6_mc_unmap(struct inet6_dev *idev) 2485 { 2486 struct ifmcaddr6 *i; 2487 2488 /* Install multicast list, except for all-nodes (already installed) */ 2489 2490 read_lock_bh(&idev->lock); 2491 for (i = idev->mc_list; i; i = i->next) 2492 igmp6_group_dropped(i); 2493 read_unlock_bh(&idev->lock); 2494 } 2495 2496 void ipv6_mc_remap(struct inet6_dev *idev) 2497 { 2498 ipv6_mc_up(idev); 2499 } 2500 2501 /* Device going down */ 2502 2503 void ipv6_mc_down(struct inet6_dev *idev) 2504 { 2505 struct ifmcaddr6 *i; 2506 2507 /* Withdraw multicast list */ 2508 2509 read_lock_bh(&idev->lock); 2510 2511 for (i = idev->mc_list; i; i = i->next) 2512 igmp6_group_dropped(i); 2513 2514 /* Should stop timer after group drop. or we will 2515 * start timer again in mld_ifc_event() 2516 */ 2517 mld_ifc_stop_timer(idev); 2518 mld_gq_stop_timer(idev); 2519 mld_dad_stop_timer(idev); 2520 read_unlock_bh(&idev->lock); 2521 } 2522 2523 static void ipv6_mc_reset(struct inet6_dev *idev) 2524 { 2525 idev->mc_qrv = sysctl_mld_qrv; 2526 idev->mc_qi = MLD_QI_DEFAULT; 2527 idev->mc_qri = MLD_QRI_DEFAULT; 2528 idev->mc_v1_seen = 0; 2529 idev->mc_maxdelay = unsolicited_report_interval(idev); 2530 } 2531 2532 /* Device going up */ 2533 2534 void ipv6_mc_up(struct inet6_dev *idev) 2535 { 2536 struct ifmcaddr6 *i; 2537 2538 /* Install multicast list, except for all-nodes (already installed) */ 2539 2540 read_lock_bh(&idev->lock); 2541 ipv6_mc_reset(idev); 2542 for (i = idev->mc_list; i; i = i->next) { 2543 mld_del_delrec(idev, i); 2544 igmp6_group_added(i); 2545 } 2546 read_unlock_bh(&idev->lock); 2547 } 2548 2549 /* IPv6 device initialization. */ 2550 2551 void ipv6_mc_init_dev(struct inet6_dev *idev) 2552 { 2553 write_lock_bh(&idev->lock); 2554 spin_lock_init(&idev->mc_lock); 2555 idev->mc_gq_running = 0; 2556 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2557 (unsigned long)idev); 2558 idev->mc_tomb = NULL; 2559 idev->mc_ifc_count = 0; 2560 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2561 (unsigned long)idev); 2562 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, 2563 (unsigned long)idev); 2564 ipv6_mc_reset(idev); 2565 write_unlock_bh(&idev->lock); 2566 } 2567 2568 /* 2569 * Device is about to be destroyed: clean up. 2570 */ 2571 2572 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2573 { 2574 struct ifmcaddr6 *i; 2575 2576 /* Deactivate timers */ 2577 ipv6_mc_down(idev); 2578 mld_clear_delrec(idev); 2579 2580 /* Delete all-nodes address. */ 2581 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2582 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2583 * fail. 2584 */ 2585 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2586 2587 if (idev->cnf.forwarding) 2588 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2589 2590 write_lock_bh(&idev->lock); 2591 while ((i = idev->mc_list) != NULL) { 2592 idev->mc_list = i->next; 2593 2594 write_unlock_bh(&idev->lock); 2595 ma_put(i); 2596 write_lock_bh(&idev->lock); 2597 } 2598 write_unlock_bh(&idev->lock); 2599 } 2600 2601 #ifdef CONFIG_PROC_FS 2602 struct igmp6_mc_iter_state { 2603 struct seq_net_private p; 2604 struct net_device *dev; 2605 struct inet6_dev *idev; 2606 }; 2607 2608 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2609 2610 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2611 { 2612 struct ifmcaddr6 *im = NULL; 2613 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2614 struct net *net = seq_file_net(seq); 2615 2616 state->idev = NULL; 2617 for_each_netdev_rcu(net, state->dev) { 2618 struct inet6_dev *idev; 2619 idev = __in6_dev_get(state->dev); 2620 if (!idev) 2621 continue; 2622 read_lock_bh(&idev->lock); 2623 im = idev->mc_list; 2624 if (im) { 2625 state->idev = idev; 2626 break; 2627 } 2628 read_unlock_bh(&idev->lock); 2629 } 2630 return im; 2631 } 2632 2633 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2634 { 2635 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2636 2637 im = im->next; 2638 while (!im) { 2639 if (likely(state->idev)) 2640 read_unlock_bh(&state->idev->lock); 2641 2642 state->dev = next_net_device_rcu(state->dev); 2643 if (!state->dev) { 2644 state->idev = NULL; 2645 break; 2646 } 2647 state->idev = __in6_dev_get(state->dev); 2648 if (!state->idev) 2649 continue; 2650 read_lock_bh(&state->idev->lock); 2651 im = state->idev->mc_list; 2652 } 2653 return im; 2654 } 2655 2656 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2657 { 2658 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2659 if (im) 2660 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2661 --pos; 2662 return pos ? NULL : im; 2663 } 2664 2665 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2666 __acquires(RCU) 2667 { 2668 rcu_read_lock(); 2669 return igmp6_mc_get_idx(seq, *pos); 2670 } 2671 2672 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2673 { 2674 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2675 2676 ++*pos; 2677 return im; 2678 } 2679 2680 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2681 __releases(RCU) 2682 { 2683 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2684 2685 if (likely(state->idev)) { 2686 read_unlock_bh(&state->idev->lock); 2687 state->idev = NULL; 2688 } 2689 state->dev = NULL; 2690 rcu_read_unlock(); 2691 } 2692 2693 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2694 { 2695 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2696 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2697 2698 seq_printf(seq, 2699 "%-4d %-15s %pi6 %5d %08X %ld\n", 2700 state->dev->ifindex, state->dev->name, 2701 &im->mca_addr, 2702 im->mca_users, im->mca_flags, 2703 (im->mca_flags&MAF_TIMER_RUNNING) ? 2704 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2705 return 0; 2706 } 2707 2708 static const struct seq_operations igmp6_mc_seq_ops = { 2709 .start = igmp6_mc_seq_start, 2710 .next = igmp6_mc_seq_next, 2711 .stop = igmp6_mc_seq_stop, 2712 .show = igmp6_mc_seq_show, 2713 }; 2714 2715 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2716 { 2717 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2718 sizeof(struct igmp6_mc_iter_state)); 2719 } 2720 2721 static const struct file_operations igmp6_mc_seq_fops = { 2722 .owner = THIS_MODULE, 2723 .open = igmp6_mc_seq_open, 2724 .read = seq_read, 2725 .llseek = seq_lseek, 2726 .release = seq_release_net, 2727 }; 2728 2729 struct igmp6_mcf_iter_state { 2730 struct seq_net_private p; 2731 struct net_device *dev; 2732 struct inet6_dev *idev; 2733 struct ifmcaddr6 *im; 2734 }; 2735 2736 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2737 2738 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2739 { 2740 struct ip6_sf_list *psf = NULL; 2741 struct ifmcaddr6 *im = NULL; 2742 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2743 struct net *net = seq_file_net(seq); 2744 2745 state->idev = NULL; 2746 state->im = NULL; 2747 for_each_netdev_rcu(net, state->dev) { 2748 struct inet6_dev *idev; 2749 idev = __in6_dev_get(state->dev); 2750 if (unlikely(idev == NULL)) 2751 continue; 2752 read_lock_bh(&idev->lock); 2753 im = idev->mc_list; 2754 if (likely(im)) { 2755 spin_lock_bh(&im->mca_lock); 2756 psf = im->mca_sources; 2757 if (likely(psf)) { 2758 state->im = im; 2759 state->idev = idev; 2760 break; 2761 } 2762 spin_unlock_bh(&im->mca_lock); 2763 } 2764 read_unlock_bh(&idev->lock); 2765 } 2766 return psf; 2767 } 2768 2769 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2770 { 2771 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2772 2773 psf = psf->sf_next; 2774 while (!psf) { 2775 spin_unlock_bh(&state->im->mca_lock); 2776 state->im = state->im->next; 2777 while (!state->im) { 2778 if (likely(state->idev)) 2779 read_unlock_bh(&state->idev->lock); 2780 2781 state->dev = next_net_device_rcu(state->dev); 2782 if (!state->dev) { 2783 state->idev = NULL; 2784 goto out; 2785 } 2786 state->idev = __in6_dev_get(state->dev); 2787 if (!state->idev) 2788 continue; 2789 read_lock_bh(&state->idev->lock); 2790 state->im = state->idev->mc_list; 2791 } 2792 if (!state->im) 2793 break; 2794 spin_lock_bh(&state->im->mca_lock); 2795 psf = state->im->mca_sources; 2796 } 2797 out: 2798 return psf; 2799 } 2800 2801 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2802 { 2803 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2804 if (psf) 2805 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2806 --pos; 2807 return pos ? NULL : psf; 2808 } 2809 2810 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2811 __acquires(RCU) 2812 { 2813 rcu_read_lock(); 2814 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2815 } 2816 2817 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2818 { 2819 struct ip6_sf_list *psf; 2820 if (v == SEQ_START_TOKEN) 2821 psf = igmp6_mcf_get_first(seq); 2822 else 2823 psf = igmp6_mcf_get_next(seq, v); 2824 ++*pos; 2825 return psf; 2826 } 2827 2828 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2829 __releases(RCU) 2830 { 2831 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2832 if (likely(state->im)) { 2833 spin_unlock_bh(&state->im->mca_lock); 2834 state->im = NULL; 2835 } 2836 if (likely(state->idev)) { 2837 read_unlock_bh(&state->idev->lock); 2838 state->idev = NULL; 2839 } 2840 state->dev = NULL; 2841 rcu_read_unlock(); 2842 } 2843 2844 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2845 { 2846 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2847 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2848 2849 if (v == SEQ_START_TOKEN) { 2850 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 2851 } else { 2852 seq_printf(seq, 2853 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2854 state->dev->ifindex, state->dev->name, 2855 &state->im->mca_addr, 2856 &psf->sf_addr, 2857 psf->sf_count[MCAST_INCLUDE], 2858 psf->sf_count[MCAST_EXCLUDE]); 2859 } 2860 return 0; 2861 } 2862 2863 static const struct seq_operations igmp6_mcf_seq_ops = { 2864 .start = igmp6_mcf_seq_start, 2865 .next = igmp6_mcf_seq_next, 2866 .stop = igmp6_mcf_seq_stop, 2867 .show = igmp6_mcf_seq_show, 2868 }; 2869 2870 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2871 { 2872 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2873 sizeof(struct igmp6_mcf_iter_state)); 2874 } 2875 2876 static const struct file_operations igmp6_mcf_seq_fops = { 2877 .owner = THIS_MODULE, 2878 .open = igmp6_mcf_seq_open, 2879 .read = seq_read, 2880 .llseek = seq_lseek, 2881 .release = seq_release_net, 2882 }; 2883 2884 static int __net_init igmp6_proc_init(struct net *net) 2885 { 2886 int err; 2887 2888 err = -ENOMEM; 2889 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) 2890 goto out; 2891 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, 2892 &igmp6_mcf_seq_fops)) 2893 goto out_proc_net_igmp6; 2894 2895 err = 0; 2896 out: 2897 return err; 2898 2899 out_proc_net_igmp6: 2900 remove_proc_entry("igmp6", net->proc_net); 2901 goto out; 2902 } 2903 2904 static void __net_exit igmp6_proc_exit(struct net *net) 2905 { 2906 remove_proc_entry("mcfilter6", net->proc_net); 2907 remove_proc_entry("igmp6", net->proc_net); 2908 } 2909 #else 2910 static inline int igmp6_proc_init(struct net *net) 2911 { 2912 return 0; 2913 } 2914 static inline void igmp6_proc_exit(struct net *net) 2915 { 2916 } 2917 #endif 2918 2919 static int __net_init igmp6_net_init(struct net *net) 2920 { 2921 int err; 2922 2923 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2924 SOCK_RAW, IPPROTO_ICMPV6, net); 2925 if (err < 0) { 2926 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2927 err); 2928 goto out; 2929 } 2930 2931 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2932 2933 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 2934 SOCK_RAW, IPPROTO_ICMPV6, net); 2935 if (err < 0) { 2936 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 2937 err); 2938 goto out_sock_create; 2939 } 2940 2941 err = igmp6_proc_init(net); 2942 if (err) 2943 goto out_sock_create_autojoin; 2944 2945 return 0; 2946 2947 out_sock_create_autojoin: 2948 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2949 out_sock_create: 2950 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2951 out: 2952 return err; 2953 } 2954 2955 static void __net_exit igmp6_net_exit(struct net *net) 2956 { 2957 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2958 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2959 igmp6_proc_exit(net); 2960 } 2961 2962 static struct pernet_operations igmp6_net_ops = { 2963 .init = igmp6_net_init, 2964 .exit = igmp6_net_exit, 2965 }; 2966 2967 int __init igmp6_init(void) 2968 { 2969 return register_pernet_subsys(&igmp6_net_ops); 2970 } 2971 2972 void igmp6_cleanup(void) 2973 { 2974 unregister_pernet_subsys(&igmp6_net_ops); 2975 } 2976