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, const struct in6_addr *addr); 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 if (mc->mca_flags & MAF_NOREPORT) 696 goto done; 697 spin_unlock_bh(&mc->mca_lock); 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 done: 706 ip6_mc_clear_src(mc); 707 spin_unlock_bh(&mc->mca_lock); 708 } 709 710 /* 711 * deleted ifmcaddr6 manipulation 712 */ 713 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 714 { 715 struct ifmcaddr6 *pmc; 716 717 /* this is an "ifmcaddr6" for convenience; only the fields below 718 * are actually used. In particular, the refcnt and users are not 719 * used for management of the delete list. Using the same structure 720 * for deleted items allows change reports to use common code with 721 * non-deleted or query-response MCA's. 722 */ 723 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 724 if (!pmc) 725 return; 726 727 spin_lock_bh(&im->mca_lock); 728 spin_lock_init(&pmc->mca_lock); 729 pmc->idev = im->idev; 730 in6_dev_hold(idev); 731 pmc->mca_addr = im->mca_addr; 732 pmc->mca_crcount = idev->mc_qrv; 733 pmc->mca_sfmode = im->mca_sfmode; 734 if (pmc->mca_sfmode == MCAST_INCLUDE) { 735 struct ip6_sf_list *psf; 736 737 pmc->mca_tomb = im->mca_tomb; 738 pmc->mca_sources = im->mca_sources; 739 im->mca_tomb = im->mca_sources = NULL; 740 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 741 psf->sf_crcount = pmc->mca_crcount; 742 } 743 spin_unlock_bh(&im->mca_lock); 744 745 spin_lock_bh(&idev->mc_lock); 746 pmc->next = idev->mc_tomb; 747 idev->mc_tomb = pmc; 748 spin_unlock_bh(&idev->mc_lock); 749 } 750 751 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca) 752 { 753 struct ifmcaddr6 *pmc, *pmc_prev; 754 struct ip6_sf_list *psf, *psf_next; 755 756 spin_lock_bh(&idev->mc_lock); 757 pmc_prev = NULL; 758 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) { 759 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 760 break; 761 pmc_prev = pmc; 762 } 763 if (pmc) { 764 if (pmc_prev) 765 pmc_prev->next = pmc->next; 766 else 767 idev->mc_tomb = pmc->next; 768 } 769 spin_unlock_bh(&idev->mc_lock); 770 771 if (pmc) { 772 for (psf = pmc->mca_tomb; psf; psf = psf_next) { 773 psf_next = psf->sf_next; 774 kfree(psf); 775 } 776 in6_dev_put(pmc->idev); 777 kfree(pmc); 778 } 779 } 780 781 static void mld_clear_delrec(struct inet6_dev *idev) 782 { 783 struct ifmcaddr6 *pmc, *nextpmc; 784 785 spin_lock_bh(&idev->mc_lock); 786 pmc = idev->mc_tomb; 787 idev->mc_tomb = NULL; 788 spin_unlock_bh(&idev->mc_lock); 789 790 for (; pmc; pmc = nextpmc) { 791 nextpmc = pmc->next; 792 ip6_mc_clear_src(pmc); 793 in6_dev_put(pmc->idev); 794 kfree(pmc); 795 } 796 797 /* clear dead sources, too */ 798 read_lock_bh(&idev->lock); 799 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 800 struct ip6_sf_list *psf, *psf_next; 801 802 spin_lock_bh(&pmc->mca_lock); 803 psf = pmc->mca_tomb; 804 pmc->mca_tomb = NULL; 805 spin_unlock_bh(&pmc->mca_lock); 806 for (; psf; psf = psf_next) { 807 psf_next = psf->sf_next; 808 kfree(psf); 809 } 810 } 811 read_unlock_bh(&idev->lock); 812 } 813 814 static void mca_get(struct ifmcaddr6 *mc) 815 { 816 atomic_inc(&mc->mca_refcnt); 817 } 818 819 static void ma_put(struct ifmcaddr6 *mc) 820 { 821 if (atomic_dec_and_test(&mc->mca_refcnt)) { 822 in6_dev_put(mc->idev); 823 kfree(mc); 824 } 825 } 826 827 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 828 const struct in6_addr *addr) 829 { 830 struct ifmcaddr6 *mc; 831 832 mc = kzalloc(sizeof(*mc), GFP_ATOMIC); 833 if (!mc) 834 return NULL; 835 836 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 837 838 mc->mca_addr = *addr; 839 mc->idev = idev; /* reference taken by caller */ 840 mc->mca_users = 1; 841 /* mca_stamp should be updated upon changes */ 842 mc->mca_cstamp = mc->mca_tstamp = jiffies; 843 atomic_set(&mc->mca_refcnt, 1); 844 spin_lock_init(&mc->mca_lock); 845 846 /* initial mode is (EX, empty) */ 847 mc->mca_sfmode = MCAST_EXCLUDE; 848 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 849 850 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 851 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 852 mc->mca_flags |= MAF_NOREPORT; 853 854 return mc; 855 } 856 857 /* 858 * device multicast group inc (add if not found) 859 */ 860 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 861 { 862 struct ifmcaddr6 *mc; 863 struct inet6_dev *idev; 864 865 ASSERT_RTNL(); 866 867 /* we need to take a reference on idev */ 868 idev = in6_dev_get(dev); 869 870 if (!idev) 871 return -EINVAL; 872 873 write_lock_bh(&idev->lock); 874 if (idev->dead) { 875 write_unlock_bh(&idev->lock); 876 in6_dev_put(idev); 877 return -ENODEV; 878 } 879 880 for (mc = idev->mc_list; mc; mc = mc->next) { 881 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 882 mc->mca_users++; 883 write_unlock_bh(&idev->lock); 884 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 885 NULL, 0); 886 in6_dev_put(idev); 887 return 0; 888 } 889 } 890 891 mc = mca_alloc(idev, addr); 892 if (!mc) { 893 write_unlock_bh(&idev->lock); 894 in6_dev_put(idev); 895 return -ENOMEM; 896 } 897 898 mc->next = idev->mc_list; 899 idev->mc_list = mc; 900 901 /* Hold this for the code below before we unlock, 902 * it is already exposed via idev->mc_list. 903 */ 904 mca_get(mc); 905 write_unlock_bh(&idev->lock); 906 907 mld_del_delrec(idev, &mc->mca_addr); 908 igmp6_group_added(mc); 909 ma_put(mc); 910 return 0; 911 } 912 913 /* 914 * device multicast group del 915 */ 916 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 917 { 918 struct ifmcaddr6 *ma, **map; 919 920 ASSERT_RTNL(); 921 922 write_lock_bh(&idev->lock); 923 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) { 924 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 925 if (--ma->mca_users == 0) { 926 *map = ma->next; 927 write_unlock_bh(&idev->lock); 928 929 igmp6_group_dropped(ma); 930 931 ma_put(ma); 932 return 0; 933 } 934 write_unlock_bh(&idev->lock); 935 return 0; 936 } 937 } 938 write_unlock_bh(&idev->lock); 939 940 return -ENOENT; 941 } 942 943 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 944 { 945 struct inet6_dev *idev; 946 int err; 947 948 ASSERT_RTNL(); 949 950 idev = __in6_dev_get(dev); 951 if (!idev) 952 err = -ENODEV; 953 else 954 err = __ipv6_dev_mc_dec(idev, addr); 955 956 return err; 957 } 958 959 /* 960 * check if the interface/address pair is valid 961 */ 962 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 963 const struct in6_addr *src_addr) 964 { 965 struct inet6_dev *idev; 966 struct ifmcaddr6 *mc; 967 bool rv = false; 968 969 rcu_read_lock(); 970 idev = __in6_dev_get(dev); 971 if (idev) { 972 read_lock_bh(&idev->lock); 973 for (mc = idev->mc_list; mc; mc = mc->next) { 974 if (ipv6_addr_equal(&mc->mca_addr, group)) 975 break; 976 } 977 if (mc) { 978 if (src_addr && !ipv6_addr_any(src_addr)) { 979 struct ip6_sf_list *psf; 980 981 spin_lock_bh(&mc->mca_lock); 982 for (psf = mc->mca_sources; psf; psf = psf->sf_next) { 983 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 984 break; 985 } 986 if (psf) 987 rv = psf->sf_count[MCAST_INCLUDE] || 988 psf->sf_count[MCAST_EXCLUDE] != 989 mc->mca_sfcount[MCAST_EXCLUDE]; 990 else 991 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; 992 spin_unlock_bh(&mc->mca_lock); 993 } else 994 rv = true; /* don't filter unspecified source */ 995 } 996 read_unlock_bh(&idev->lock); 997 } 998 rcu_read_unlock(); 999 return rv; 1000 } 1001 1002 static void mld_gq_start_timer(struct inet6_dev *idev) 1003 { 1004 unsigned long tv = prandom_u32() % idev->mc_maxdelay; 1005 1006 idev->mc_gq_running = 1; 1007 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1008 in6_dev_hold(idev); 1009 } 1010 1011 static void mld_gq_stop_timer(struct inet6_dev *idev) 1012 { 1013 idev->mc_gq_running = 0; 1014 if (del_timer(&idev->mc_gq_timer)) 1015 __in6_dev_put(idev); 1016 } 1017 1018 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) 1019 { 1020 unsigned long tv = prandom_u32() % delay; 1021 1022 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1023 in6_dev_hold(idev); 1024 } 1025 1026 static void mld_ifc_stop_timer(struct inet6_dev *idev) 1027 { 1028 idev->mc_ifc_count = 0; 1029 if (del_timer(&idev->mc_ifc_timer)) 1030 __in6_dev_put(idev); 1031 } 1032 1033 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) 1034 { 1035 unsigned long tv = prandom_u32() % delay; 1036 1037 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) 1038 in6_dev_hold(idev); 1039 } 1040 1041 static void mld_dad_stop_timer(struct inet6_dev *idev) 1042 { 1043 if (del_timer(&idev->mc_dad_timer)) 1044 __in6_dev_put(idev); 1045 } 1046 1047 /* 1048 * IGMP handling (alias multicast ICMPv6 messages) 1049 */ 1050 1051 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1052 { 1053 unsigned long delay = resptime; 1054 1055 /* Do not start timer for these addresses */ 1056 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1057 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1058 return; 1059 1060 if (del_timer(&ma->mca_timer)) { 1061 atomic_dec(&ma->mca_refcnt); 1062 delay = ma->mca_timer.expires - jiffies; 1063 } 1064 1065 if (delay >= resptime) 1066 delay = prandom_u32() % resptime; 1067 1068 ma->mca_timer.expires = jiffies + delay; 1069 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1070 atomic_inc(&ma->mca_refcnt); 1071 ma->mca_flags |= MAF_TIMER_RUNNING; 1072 } 1073 1074 /* mark EXCLUDE-mode sources */ 1075 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1076 const struct in6_addr *srcs) 1077 { 1078 struct ip6_sf_list *psf; 1079 int i, scount; 1080 1081 scount = 0; 1082 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1083 if (scount == nsrcs) 1084 break; 1085 for (i = 0; i < nsrcs; i++) { 1086 /* skip inactive filters */ 1087 if (psf->sf_count[MCAST_INCLUDE] || 1088 pmc->mca_sfcount[MCAST_EXCLUDE] != 1089 psf->sf_count[MCAST_EXCLUDE]) 1090 break; 1091 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1092 scount++; 1093 break; 1094 } 1095 } 1096 } 1097 pmc->mca_flags &= ~MAF_GSQUERY; 1098 if (scount == nsrcs) /* all sources excluded */ 1099 return false; 1100 return true; 1101 } 1102 1103 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1104 const struct in6_addr *srcs) 1105 { 1106 struct ip6_sf_list *psf; 1107 int i, scount; 1108 1109 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1110 return mld_xmarksources(pmc, nsrcs, srcs); 1111 1112 /* mark INCLUDE-mode sources */ 1113 1114 scount = 0; 1115 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1116 if (scount == nsrcs) 1117 break; 1118 for (i = 0; i < nsrcs; i++) { 1119 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1120 psf->sf_gsresp = 1; 1121 scount++; 1122 break; 1123 } 1124 } 1125 } 1126 if (!scount) { 1127 pmc->mca_flags &= ~MAF_GSQUERY; 1128 return false; 1129 } 1130 pmc->mca_flags |= MAF_GSQUERY; 1131 return true; 1132 } 1133 1134 static int mld_force_mld_version(const struct inet6_dev *idev) 1135 { 1136 /* Normally, both are 0 here. If enforcement to a particular is 1137 * being used, individual device enforcement will have a lower 1138 * precedence over 'all' device (.../conf/all/force_mld_version). 1139 */ 1140 1141 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1142 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1143 else 1144 return idev->cnf.force_mld_version; 1145 } 1146 1147 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1148 { 1149 return mld_force_mld_version(idev) == 2; 1150 } 1151 1152 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1153 { 1154 return mld_force_mld_version(idev) == 1; 1155 } 1156 1157 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1158 { 1159 if (mld_in_v2_mode_only(idev)) 1160 return false; 1161 if (mld_in_v1_mode_only(idev)) 1162 return true; 1163 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1164 return true; 1165 1166 return false; 1167 } 1168 1169 static void mld_set_v1_mode(struct inet6_dev *idev) 1170 { 1171 /* RFC3810, relevant sections: 1172 * - 9.1. Robustness Variable 1173 * - 9.2. Query Interval 1174 * - 9.3. Query Response Interval 1175 * - 9.12. Older Version Querier Present Timeout 1176 */ 1177 unsigned long switchback; 1178 1179 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1180 1181 idev->mc_v1_seen = jiffies + switchback; 1182 } 1183 1184 static void mld_update_qrv(struct inet6_dev *idev, 1185 const struct mld2_query *mlh2) 1186 { 1187 /* RFC3810, relevant sections: 1188 * - 5.1.8. QRV (Querier's Robustness Variable) 1189 * - 9.1. Robustness Variable 1190 */ 1191 1192 /* The value of the Robustness Variable MUST NOT be zero, 1193 * and SHOULD NOT be one. Catch this here if we ever run 1194 * into such a case in future. 1195 */ 1196 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1197 WARN_ON(idev->mc_qrv == 0); 1198 1199 if (mlh2->mld2q_qrv > 0) 1200 idev->mc_qrv = mlh2->mld2q_qrv; 1201 1202 if (unlikely(idev->mc_qrv < min_qrv)) { 1203 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1204 idev->mc_qrv, min_qrv); 1205 idev->mc_qrv = min_qrv; 1206 } 1207 } 1208 1209 static void mld_update_qi(struct inet6_dev *idev, 1210 const struct mld2_query *mlh2) 1211 { 1212 /* RFC3810, relevant sections: 1213 * - 5.1.9. QQIC (Querier's Query Interval Code) 1214 * - 9.2. Query Interval 1215 * - 9.12. Older Version Querier Present Timeout 1216 * (the [Query Interval] in the last Query received) 1217 */ 1218 unsigned long mc_qqi; 1219 1220 if (mlh2->mld2q_qqic < 128) { 1221 mc_qqi = mlh2->mld2q_qqic; 1222 } else { 1223 unsigned long mc_man, mc_exp; 1224 1225 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1226 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1227 1228 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1229 } 1230 1231 idev->mc_qi = mc_qqi * HZ; 1232 } 1233 1234 static void mld_update_qri(struct inet6_dev *idev, 1235 const struct mld2_query *mlh2) 1236 { 1237 /* RFC3810, relevant sections: 1238 * - 5.1.3. Maximum Response Code 1239 * - 9.3. Query Response Interval 1240 */ 1241 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1242 } 1243 1244 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1245 unsigned long *max_delay, bool v1_query) 1246 { 1247 unsigned long mldv1_md; 1248 1249 /* Ignore v1 queries */ 1250 if (mld_in_v2_mode_only(idev)) 1251 return -EINVAL; 1252 1253 mldv1_md = ntohs(mld->mld_maxdelay); 1254 1255 /* When in MLDv1 fallback and a MLDv2 router start-up being 1256 * unaware of current MLDv1 operation, the MRC == MRD mapping 1257 * only works when the exponential algorithm is not being 1258 * used (as MLDv1 is unaware of such things). 1259 * 1260 * According to the RFC author, the MLDv2 implementations 1261 * he's aware of all use a MRC < 32768 on start up queries. 1262 * 1263 * Thus, should we *ever* encounter something else larger 1264 * than that, just assume the maximum possible within our 1265 * reach. 1266 */ 1267 if (!v1_query) 1268 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1269 1270 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1271 1272 /* MLDv1 router present: we need to go into v1 mode *only* 1273 * when an MLDv1 query is received as per section 9.12. of 1274 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1275 * queries MUST be of exactly 24 octets. 1276 */ 1277 if (v1_query) 1278 mld_set_v1_mode(idev); 1279 1280 /* cancel MLDv2 report timer */ 1281 mld_gq_stop_timer(idev); 1282 /* cancel the interface change timer */ 1283 mld_ifc_stop_timer(idev); 1284 /* clear deleted report items */ 1285 mld_clear_delrec(idev); 1286 1287 return 0; 1288 } 1289 1290 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1291 unsigned long *max_delay) 1292 { 1293 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1294 1295 mld_update_qrv(idev, mld); 1296 mld_update_qi(idev, mld); 1297 mld_update_qri(idev, mld); 1298 1299 idev->mc_maxdelay = *max_delay; 1300 1301 return 0; 1302 } 1303 1304 /* called with rcu_read_lock() */ 1305 int igmp6_event_query(struct sk_buff *skb) 1306 { 1307 struct mld2_query *mlh2 = NULL; 1308 struct ifmcaddr6 *ma; 1309 const struct in6_addr *group; 1310 unsigned long max_delay; 1311 struct inet6_dev *idev; 1312 struct mld_msg *mld; 1313 int group_type; 1314 int mark = 0; 1315 int len, err; 1316 1317 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1318 return -EINVAL; 1319 1320 /* compute payload length excluding extension headers */ 1321 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1322 len -= skb_network_header_len(skb); 1323 1324 /* RFC3810 6.2 1325 * Upon reception of an MLD message that contains a Query, the node 1326 * checks if the source address of the message is a valid link-local 1327 * address, if the Hop Limit is set to 1, and if the Router Alert 1328 * option is present in the Hop-By-Hop Options header of the IPv6 1329 * packet. If any of these checks fails, the packet is dropped. 1330 */ 1331 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1332 ipv6_hdr(skb)->hop_limit != 1 || 1333 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1334 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1335 return -EINVAL; 1336 1337 idev = __in6_dev_get(skb->dev); 1338 if (!idev) 1339 return 0; 1340 1341 mld = (struct mld_msg *)icmp6_hdr(skb); 1342 group = &mld->mld_mca; 1343 group_type = ipv6_addr_type(group); 1344 1345 if (group_type != IPV6_ADDR_ANY && 1346 !(group_type&IPV6_ADDR_MULTICAST)) 1347 return -EINVAL; 1348 1349 if (len < MLD_V1_QUERY_LEN) { 1350 return -EINVAL; 1351 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1352 err = mld_process_v1(idev, mld, &max_delay, 1353 len == MLD_V1_QUERY_LEN); 1354 if (err < 0) 1355 return err; 1356 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1357 int srcs_offset = sizeof(struct mld2_query) - 1358 sizeof(struct icmp6hdr); 1359 1360 if (!pskb_may_pull(skb, srcs_offset)) 1361 return -EINVAL; 1362 1363 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1364 1365 err = mld_process_v2(idev, mlh2, &max_delay); 1366 if (err < 0) 1367 return err; 1368 1369 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1370 if (mlh2->mld2q_nsrcs) 1371 return -EINVAL; /* no sources allowed */ 1372 1373 mld_gq_start_timer(idev); 1374 return 0; 1375 } 1376 /* mark sources to include, if group & source-specific */ 1377 if (mlh2->mld2q_nsrcs != 0) { 1378 if (!pskb_may_pull(skb, srcs_offset + 1379 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1380 return -EINVAL; 1381 1382 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1383 mark = 1; 1384 } 1385 } else { 1386 return -EINVAL; 1387 } 1388 1389 read_lock_bh(&idev->lock); 1390 if (group_type == IPV6_ADDR_ANY) { 1391 for (ma = idev->mc_list; ma; ma = ma->next) { 1392 spin_lock_bh(&ma->mca_lock); 1393 igmp6_group_queried(ma, max_delay); 1394 spin_unlock_bh(&ma->mca_lock); 1395 } 1396 } else { 1397 for (ma = idev->mc_list; ma; ma = ma->next) { 1398 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1399 continue; 1400 spin_lock_bh(&ma->mca_lock); 1401 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1402 /* gsquery <- gsquery && mark */ 1403 if (!mark) 1404 ma->mca_flags &= ~MAF_GSQUERY; 1405 } else { 1406 /* gsquery <- mark */ 1407 if (mark) 1408 ma->mca_flags |= MAF_GSQUERY; 1409 else 1410 ma->mca_flags &= ~MAF_GSQUERY; 1411 } 1412 if (!(ma->mca_flags & MAF_GSQUERY) || 1413 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1414 igmp6_group_queried(ma, max_delay); 1415 spin_unlock_bh(&ma->mca_lock); 1416 break; 1417 } 1418 } 1419 read_unlock_bh(&idev->lock); 1420 1421 return 0; 1422 } 1423 1424 /* called with rcu_read_lock() */ 1425 int igmp6_event_report(struct sk_buff *skb) 1426 { 1427 struct ifmcaddr6 *ma; 1428 struct inet6_dev *idev; 1429 struct mld_msg *mld; 1430 int addr_type; 1431 1432 /* Our own report looped back. Ignore it. */ 1433 if (skb->pkt_type == PACKET_LOOPBACK) 1434 return 0; 1435 1436 /* send our report if the MC router may not have heard this report */ 1437 if (skb->pkt_type != PACKET_MULTICAST && 1438 skb->pkt_type != PACKET_BROADCAST) 1439 return 0; 1440 1441 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1442 return -EINVAL; 1443 1444 mld = (struct mld_msg *)icmp6_hdr(skb); 1445 1446 /* Drop reports with not link local source */ 1447 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1448 if (addr_type != IPV6_ADDR_ANY && 1449 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1450 return -EINVAL; 1451 1452 idev = __in6_dev_get(skb->dev); 1453 if (!idev) 1454 return -ENODEV; 1455 1456 /* 1457 * Cancel the timer for this group 1458 */ 1459 1460 read_lock_bh(&idev->lock); 1461 for (ma = idev->mc_list; ma; ma = ma->next) { 1462 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1463 spin_lock(&ma->mca_lock); 1464 if (del_timer(&ma->mca_timer)) 1465 atomic_dec(&ma->mca_refcnt); 1466 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1467 spin_unlock(&ma->mca_lock); 1468 break; 1469 } 1470 } 1471 read_unlock_bh(&idev->lock); 1472 return 0; 1473 } 1474 1475 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1476 int gdeleted, int sdeleted) 1477 { 1478 switch (type) { 1479 case MLD2_MODE_IS_INCLUDE: 1480 case MLD2_MODE_IS_EXCLUDE: 1481 if (gdeleted || sdeleted) 1482 return false; 1483 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1484 if (pmc->mca_sfmode == MCAST_INCLUDE) 1485 return true; 1486 /* don't include if this source is excluded 1487 * in all filters 1488 */ 1489 if (psf->sf_count[MCAST_INCLUDE]) 1490 return type == MLD2_MODE_IS_INCLUDE; 1491 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1492 psf->sf_count[MCAST_EXCLUDE]; 1493 } 1494 return false; 1495 case MLD2_CHANGE_TO_INCLUDE: 1496 if (gdeleted || sdeleted) 1497 return false; 1498 return psf->sf_count[MCAST_INCLUDE] != 0; 1499 case MLD2_CHANGE_TO_EXCLUDE: 1500 if (gdeleted || sdeleted) 1501 return false; 1502 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1503 psf->sf_count[MCAST_INCLUDE]) 1504 return false; 1505 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1506 psf->sf_count[MCAST_EXCLUDE]; 1507 case MLD2_ALLOW_NEW_SOURCES: 1508 if (gdeleted || !psf->sf_crcount) 1509 return false; 1510 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1511 case MLD2_BLOCK_OLD_SOURCES: 1512 if (pmc->mca_sfmode == MCAST_INCLUDE) 1513 return gdeleted || (psf->sf_crcount && sdeleted); 1514 return psf->sf_crcount && !gdeleted && !sdeleted; 1515 } 1516 return false; 1517 } 1518 1519 static int 1520 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1521 { 1522 struct ip6_sf_list *psf; 1523 int scount = 0; 1524 1525 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1526 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1527 continue; 1528 scount++; 1529 } 1530 return scount; 1531 } 1532 1533 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1534 struct net_device *dev, 1535 const struct in6_addr *saddr, 1536 const struct in6_addr *daddr, 1537 int proto, int len) 1538 { 1539 struct ipv6hdr *hdr; 1540 1541 skb->protocol = htons(ETH_P_IPV6); 1542 skb->dev = dev; 1543 1544 skb_reset_network_header(skb); 1545 skb_put(skb, sizeof(struct ipv6hdr)); 1546 hdr = ipv6_hdr(skb); 1547 1548 ip6_flow_hdr(hdr, 0, 0); 1549 1550 hdr->payload_len = htons(len); 1551 hdr->nexthdr = proto; 1552 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1553 1554 hdr->saddr = *saddr; 1555 hdr->daddr = *daddr; 1556 } 1557 1558 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1559 { 1560 struct net_device *dev = idev->dev; 1561 struct net *net = dev_net(dev); 1562 struct sock *sk = net->ipv6.igmp_sk; 1563 struct sk_buff *skb; 1564 struct mld2_report *pmr; 1565 struct in6_addr addr_buf; 1566 const struct in6_addr *saddr; 1567 int hlen = LL_RESERVED_SPACE(dev); 1568 int tlen = dev->needed_tailroom; 1569 unsigned int size = mtu + hlen + tlen; 1570 int err; 1571 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1572 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1573 IPV6_TLV_PADN, 0 }; 1574 1575 /* we assume size > sizeof(ra) here */ 1576 /* limit our allocations to order-0 page */ 1577 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1578 skb = sock_alloc_send_skb(sk, size, 1, &err); 1579 1580 if (!skb) 1581 return NULL; 1582 1583 skb->priority = TC_PRIO_CONTROL; 1584 skb_reserve(skb, hlen); 1585 skb_tailroom_reserve(skb, mtu, tlen); 1586 1587 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1588 /* <draft-ietf-magma-mld-source-05.txt>: 1589 * use unspecified address as the source address 1590 * when a valid link-local address is not available. 1591 */ 1592 saddr = &in6addr_any; 1593 } else 1594 saddr = &addr_buf; 1595 1596 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1597 1598 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1599 1600 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1601 skb_put(skb, sizeof(*pmr)); 1602 pmr = (struct mld2_report *)skb_transport_header(skb); 1603 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1604 pmr->mld2r_resv1 = 0; 1605 pmr->mld2r_cksum = 0; 1606 pmr->mld2r_resv2 = 0; 1607 pmr->mld2r_ngrec = 0; 1608 return skb; 1609 } 1610 1611 static void mld_sendpack(struct sk_buff *skb) 1612 { 1613 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1614 struct mld2_report *pmr = 1615 (struct mld2_report *)skb_transport_header(skb); 1616 int payload_len, mldlen; 1617 struct inet6_dev *idev; 1618 struct net *net = dev_net(skb->dev); 1619 int err; 1620 struct flowi6 fl6; 1621 struct dst_entry *dst; 1622 1623 rcu_read_lock(); 1624 idev = __in6_dev_get(skb->dev); 1625 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1626 1627 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1628 sizeof(*pip6); 1629 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1630 pip6->payload_len = htons(payload_len); 1631 1632 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1633 IPPROTO_ICMPV6, 1634 csum_partial(skb_transport_header(skb), 1635 mldlen, 0)); 1636 1637 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1638 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1639 skb->dev->ifindex); 1640 dst = icmp6_dst_alloc(skb->dev, &fl6); 1641 1642 err = 0; 1643 if (IS_ERR(dst)) { 1644 err = PTR_ERR(dst); 1645 dst = NULL; 1646 } 1647 skb_dst_set(skb, dst); 1648 if (err) 1649 goto err_out; 1650 1651 payload_len = skb->len; 1652 1653 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1654 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1655 dst_output); 1656 out: 1657 if (!err) { 1658 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1659 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1660 } else { 1661 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1662 } 1663 1664 rcu_read_unlock(); 1665 return; 1666 1667 err_out: 1668 kfree_skb(skb); 1669 goto out; 1670 } 1671 1672 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1673 { 1674 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1675 } 1676 1677 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1678 int type, struct mld2_grec **ppgr) 1679 { 1680 struct net_device *dev = pmc->idev->dev; 1681 struct mld2_report *pmr; 1682 struct mld2_grec *pgr; 1683 1684 if (!skb) 1685 skb = mld_newpack(pmc->idev, dev->mtu); 1686 if (!skb) 1687 return NULL; 1688 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1689 pgr->grec_type = type; 1690 pgr->grec_auxwords = 0; 1691 pgr->grec_nsrcs = 0; 1692 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1693 pmr = (struct mld2_report *)skb_transport_header(skb); 1694 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1695 *ppgr = pgr; 1696 return skb; 1697 } 1698 1699 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1700 1701 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1702 int type, int gdeleted, int sdeleted, int crsend) 1703 { 1704 struct inet6_dev *idev = pmc->idev; 1705 struct net_device *dev = idev->dev; 1706 struct mld2_report *pmr; 1707 struct mld2_grec *pgr = NULL; 1708 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1709 int scount, stotal, first, isquery, truncate; 1710 1711 if (pmc->mca_flags & MAF_NOREPORT) 1712 return skb; 1713 1714 isquery = type == MLD2_MODE_IS_INCLUDE || 1715 type == MLD2_MODE_IS_EXCLUDE; 1716 truncate = type == MLD2_MODE_IS_EXCLUDE || 1717 type == MLD2_CHANGE_TO_EXCLUDE; 1718 1719 stotal = scount = 0; 1720 1721 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1722 1723 if (!*psf_list) 1724 goto empty_source; 1725 1726 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1727 1728 /* EX and TO_EX get a fresh packet, if needed */ 1729 if (truncate) { 1730 if (pmr && pmr->mld2r_ngrec && 1731 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1732 if (skb) 1733 mld_sendpack(skb); 1734 skb = mld_newpack(idev, dev->mtu); 1735 } 1736 } 1737 first = 1; 1738 psf_prev = NULL; 1739 for (psf = *psf_list; psf; psf = psf_next) { 1740 struct in6_addr *psrc; 1741 1742 psf_next = psf->sf_next; 1743 1744 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1745 psf_prev = psf; 1746 continue; 1747 } 1748 1749 /* Based on RFC3810 6.1. Should not send source-list change 1750 * records when there is a filter mode change. 1751 */ 1752 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1753 (!gdeleted && pmc->mca_crcount)) && 1754 (type == MLD2_ALLOW_NEW_SOURCES || 1755 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1756 goto decrease_sf_crcount; 1757 1758 /* clear marks on query responses */ 1759 if (isquery) 1760 psf->sf_gsresp = 0; 1761 1762 if (AVAILABLE(skb) < sizeof(*psrc) + 1763 first*sizeof(struct mld2_grec)) { 1764 if (truncate && !first) 1765 break; /* truncate these */ 1766 if (pgr) 1767 pgr->grec_nsrcs = htons(scount); 1768 if (skb) 1769 mld_sendpack(skb); 1770 skb = mld_newpack(idev, dev->mtu); 1771 first = 1; 1772 scount = 0; 1773 } 1774 if (first) { 1775 skb = add_grhead(skb, pmc, type, &pgr); 1776 first = 0; 1777 } 1778 if (!skb) 1779 return NULL; 1780 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1781 *psrc = psf->sf_addr; 1782 scount++; stotal++; 1783 if ((type == MLD2_ALLOW_NEW_SOURCES || 1784 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1785 decrease_sf_crcount: 1786 psf->sf_crcount--; 1787 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1788 if (psf_prev) 1789 psf_prev->sf_next = psf->sf_next; 1790 else 1791 *psf_list = psf->sf_next; 1792 kfree(psf); 1793 continue; 1794 } 1795 } 1796 psf_prev = psf; 1797 } 1798 1799 empty_source: 1800 if (!stotal) { 1801 if (type == MLD2_ALLOW_NEW_SOURCES || 1802 type == MLD2_BLOCK_OLD_SOURCES) 1803 return skb; 1804 if (pmc->mca_crcount || isquery || crsend) { 1805 /* make sure we have room for group header */ 1806 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1807 mld_sendpack(skb); 1808 skb = NULL; /* add_grhead will get a new one */ 1809 } 1810 skb = add_grhead(skb, pmc, type, &pgr); 1811 } 1812 } 1813 if (pgr) 1814 pgr->grec_nsrcs = htons(scount); 1815 1816 if (isquery) 1817 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1818 return skb; 1819 } 1820 1821 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1822 { 1823 struct sk_buff *skb = NULL; 1824 int type; 1825 1826 read_lock_bh(&idev->lock); 1827 if (!pmc) { 1828 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1829 if (pmc->mca_flags & MAF_NOREPORT) 1830 continue; 1831 spin_lock_bh(&pmc->mca_lock); 1832 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1833 type = MLD2_MODE_IS_EXCLUDE; 1834 else 1835 type = MLD2_MODE_IS_INCLUDE; 1836 skb = add_grec(skb, pmc, type, 0, 0, 0); 1837 spin_unlock_bh(&pmc->mca_lock); 1838 } 1839 } else { 1840 spin_lock_bh(&pmc->mca_lock); 1841 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1842 type = MLD2_MODE_IS_EXCLUDE; 1843 else 1844 type = MLD2_MODE_IS_INCLUDE; 1845 skb = add_grec(skb, pmc, type, 0, 0, 0); 1846 spin_unlock_bh(&pmc->mca_lock); 1847 } 1848 read_unlock_bh(&idev->lock); 1849 if (skb) 1850 mld_sendpack(skb); 1851 } 1852 1853 /* 1854 * remove zero-count source records from a source filter list 1855 */ 1856 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1857 { 1858 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1859 1860 psf_prev = NULL; 1861 for (psf = *ppsf; psf; psf = psf_next) { 1862 psf_next = psf->sf_next; 1863 if (psf->sf_crcount == 0) { 1864 if (psf_prev) 1865 psf_prev->sf_next = psf->sf_next; 1866 else 1867 *ppsf = psf->sf_next; 1868 kfree(psf); 1869 } else 1870 psf_prev = psf; 1871 } 1872 } 1873 1874 static void mld_send_cr(struct inet6_dev *idev) 1875 { 1876 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1877 struct sk_buff *skb = NULL; 1878 int type, dtype; 1879 1880 read_lock_bh(&idev->lock); 1881 spin_lock(&idev->mc_lock); 1882 1883 /* deleted MCA's */ 1884 pmc_prev = NULL; 1885 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) { 1886 pmc_next = pmc->next; 1887 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1888 type = MLD2_BLOCK_OLD_SOURCES; 1889 dtype = MLD2_BLOCK_OLD_SOURCES; 1890 skb = add_grec(skb, pmc, type, 1, 0, 0); 1891 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 1892 } 1893 if (pmc->mca_crcount) { 1894 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1895 type = MLD2_CHANGE_TO_INCLUDE; 1896 skb = add_grec(skb, pmc, type, 1, 0, 0); 1897 } 1898 pmc->mca_crcount--; 1899 if (pmc->mca_crcount == 0) { 1900 mld_clear_zeros(&pmc->mca_tomb); 1901 mld_clear_zeros(&pmc->mca_sources); 1902 } 1903 } 1904 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1905 !pmc->mca_sources) { 1906 if (pmc_prev) 1907 pmc_prev->next = pmc_next; 1908 else 1909 idev->mc_tomb = pmc_next; 1910 in6_dev_put(pmc->idev); 1911 kfree(pmc); 1912 } else 1913 pmc_prev = pmc; 1914 } 1915 spin_unlock(&idev->mc_lock); 1916 1917 /* change recs */ 1918 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1919 spin_lock_bh(&pmc->mca_lock); 1920 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1921 type = MLD2_BLOCK_OLD_SOURCES; 1922 dtype = MLD2_ALLOW_NEW_SOURCES; 1923 } else { 1924 type = MLD2_ALLOW_NEW_SOURCES; 1925 dtype = MLD2_BLOCK_OLD_SOURCES; 1926 } 1927 skb = add_grec(skb, pmc, type, 0, 0, 0); 1928 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 1929 1930 /* filter mode changes */ 1931 if (pmc->mca_crcount) { 1932 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1933 type = MLD2_CHANGE_TO_EXCLUDE; 1934 else 1935 type = MLD2_CHANGE_TO_INCLUDE; 1936 skb = add_grec(skb, pmc, type, 0, 0, 0); 1937 pmc->mca_crcount--; 1938 } 1939 spin_unlock_bh(&pmc->mca_lock); 1940 } 1941 read_unlock_bh(&idev->lock); 1942 if (!skb) 1943 return; 1944 (void) mld_sendpack(skb); 1945 } 1946 1947 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1948 { 1949 struct net *net = dev_net(dev); 1950 struct sock *sk = net->ipv6.igmp_sk; 1951 struct inet6_dev *idev; 1952 struct sk_buff *skb; 1953 struct mld_msg *hdr; 1954 const struct in6_addr *snd_addr, *saddr; 1955 struct in6_addr addr_buf; 1956 int hlen = LL_RESERVED_SPACE(dev); 1957 int tlen = dev->needed_tailroom; 1958 int err, len, payload_len, full_len; 1959 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1960 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1961 IPV6_TLV_PADN, 0 }; 1962 struct flowi6 fl6; 1963 struct dst_entry *dst; 1964 1965 if (type == ICMPV6_MGM_REDUCTION) 1966 snd_addr = &in6addr_linklocal_allrouters; 1967 else 1968 snd_addr = addr; 1969 1970 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1971 payload_len = len + sizeof(ra); 1972 full_len = sizeof(struct ipv6hdr) + payload_len; 1973 1974 rcu_read_lock(); 1975 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1976 IPSTATS_MIB_OUT, full_len); 1977 rcu_read_unlock(); 1978 1979 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1980 1981 if (!skb) { 1982 rcu_read_lock(); 1983 IP6_INC_STATS(net, __in6_dev_get(dev), 1984 IPSTATS_MIB_OUTDISCARDS); 1985 rcu_read_unlock(); 1986 return; 1987 } 1988 skb->priority = TC_PRIO_CONTROL; 1989 skb_reserve(skb, hlen); 1990 1991 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1992 /* <draft-ietf-magma-mld-source-05.txt>: 1993 * use unspecified address as the source address 1994 * when a valid link-local address is not available. 1995 */ 1996 saddr = &in6addr_any; 1997 } else 1998 saddr = &addr_buf; 1999 2000 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2001 2002 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 2003 2004 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 2005 memset(hdr, 0, sizeof(struct mld_msg)); 2006 hdr->mld_type = type; 2007 hdr->mld_mca = *addr; 2008 2009 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2010 IPPROTO_ICMPV6, 2011 csum_partial(hdr, len, 0)); 2012 2013 rcu_read_lock(); 2014 idev = __in6_dev_get(skb->dev); 2015 2016 icmpv6_flow_init(sk, &fl6, type, 2017 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2018 skb->dev->ifindex); 2019 dst = icmp6_dst_alloc(skb->dev, &fl6); 2020 if (IS_ERR(dst)) { 2021 err = PTR_ERR(dst); 2022 goto err_out; 2023 } 2024 2025 skb_dst_set(skb, dst); 2026 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2027 net, sk, skb, NULL, skb->dev, 2028 dst_output); 2029 out: 2030 if (!err) { 2031 ICMP6MSGOUT_INC_STATS(net, idev, type); 2032 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2033 } else 2034 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2035 2036 rcu_read_unlock(); 2037 return; 2038 2039 err_out: 2040 kfree_skb(skb); 2041 goto out; 2042 } 2043 2044 static void mld_send_initial_cr(struct inet6_dev *idev) 2045 { 2046 struct sk_buff *skb; 2047 struct ifmcaddr6 *pmc; 2048 int type; 2049 2050 if (mld_in_v1_mode(idev)) 2051 return; 2052 2053 skb = NULL; 2054 read_lock_bh(&idev->lock); 2055 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2056 spin_lock_bh(&pmc->mca_lock); 2057 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2058 type = MLD2_CHANGE_TO_EXCLUDE; 2059 else 2060 type = MLD2_CHANGE_TO_INCLUDE; 2061 skb = add_grec(skb, pmc, type, 0, 0, 1); 2062 spin_unlock_bh(&pmc->mca_lock); 2063 } 2064 read_unlock_bh(&idev->lock); 2065 if (skb) 2066 mld_sendpack(skb); 2067 } 2068 2069 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2070 { 2071 idev->mc_dad_count = idev->mc_qrv; 2072 if (idev->mc_dad_count) { 2073 mld_send_initial_cr(idev); 2074 idev->mc_dad_count--; 2075 if (idev->mc_dad_count) 2076 mld_dad_start_timer(idev, idev->mc_maxdelay); 2077 } 2078 } 2079 2080 static void mld_dad_timer_expire(unsigned long data) 2081 { 2082 struct inet6_dev *idev = (struct inet6_dev *)data; 2083 2084 mld_send_initial_cr(idev); 2085 if (idev->mc_dad_count) { 2086 idev->mc_dad_count--; 2087 if (idev->mc_dad_count) 2088 mld_dad_start_timer(idev, idev->mc_maxdelay); 2089 } 2090 in6_dev_put(idev); 2091 } 2092 2093 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2094 const struct in6_addr *psfsrc) 2095 { 2096 struct ip6_sf_list *psf, *psf_prev; 2097 int rv = 0; 2098 2099 psf_prev = NULL; 2100 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2101 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2102 break; 2103 psf_prev = psf; 2104 } 2105 if (!psf || psf->sf_count[sfmode] == 0) { 2106 /* source filter not found, or count wrong => bug */ 2107 return -ESRCH; 2108 } 2109 psf->sf_count[sfmode]--; 2110 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2111 struct inet6_dev *idev = pmc->idev; 2112 2113 /* no more filters for this source */ 2114 if (psf_prev) 2115 psf_prev->sf_next = psf->sf_next; 2116 else 2117 pmc->mca_sources = psf->sf_next; 2118 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2119 !mld_in_v1_mode(idev)) { 2120 psf->sf_crcount = idev->mc_qrv; 2121 psf->sf_next = pmc->mca_tomb; 2122 pmc->mca_tomb = psf; 2123 rv = 1; 2124 } else 2125 kfree(psf); 2126 } 2127 return rv; 2128 } 2129 2130 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2131 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2132 int delta) 2133 { 2134 struct ifmcaddr6 *pmc; 2135 int changerec = 0; 2136 int i, err; 2137 2138 if (!idev) 2139 return -ENODEV; 2140 read_lock_bh(&idev->lock); 2141 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2142 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2143 break; 2144 } 2145 if (!pmc) { 2146 /* MCA not found?? bug */ 2147 read_unlock_bh(&idev->lock); 2148 return -ESRCH; 2149 } 2150 spin_lock_bh(&pmc->mca_lock); 2151 sf_markstate(pmc); 2152 if (!delta) { 2153 if (!pmc->mca_sfcount[sfmode]) { 2154 spin_unlock_bh(&pmc->mca_lock); 2155 read_unlock_bh(&idev->lock); 2156 return -EINVAL; 2157 } 2158 pmc->mca_sfcount[sfmode]--; 2159 } 2160 err = 0; 2161 for (i = 0; i < sfcount; i++) { 2162 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2163 2164 changerec |= rv > 0; 2165 if (!err && rv < 0) 2166 err = rv; 2167 } 2168 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2169 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2170 pmc->mca_sfcount[MCAST_INCLUDE]) { 2171 struct ip6_sf_list *psf; 2172 2173 /* filter mode change */ 2174 pmc->mca_sfmode = MCAST_INCLUDE; 2175 pmc->mca_crcount = idev->mc_qrv; 2176 idev->mc_ifc_count = pmc->mca_crcount; 2177 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2178 psf->sf_crcount = 0; 2179 mld_ifc_event(pmc->idev); 2180 } else if (sf_setstate(pmc) || changerec) 2181 mld_ifc_event(pmc->idev); 2182 spin_unlock_bh(&pmc->mca_lock); 2183 read_unlock_bh(&idev->lock); 2184 return err; 2185 } 2186 2187 /* 2188 * Add multicast single-source filter to the interface list 2189 */ 2190 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2191 const struct in6_addr *psfsrc) 2192 { 2193 struct ip6_sf_list *psf, *psf_prev; 2194 2195 psf_prev = NULL; 2196 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2197 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2198 break; 2199 psf_prev = psf; 2200 } 2201 if (!psf) { 2202 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 2203 if (!psf) 2204 return -ENOBUFS; 2205 2206 psf->sf_addr = *psfsrc; 2207 if (psf_prev) { 2208 psf_prev->sf_next = psf; 2209 } else 2210 pmc->mca_sources = psf; 2211 } 2212 psf->sf_count[sfmode]++; 2213 return 0; 2214 } 2215 2216 static void sf_markstate(struct ifmcaddr6 *pmc) 2217 { 2218 struct ip6_sf_list *psf; 2219 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2220 2221 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2222 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2223 psf->sf_oldin = mca_xcount == 2224 psf->sf_count[MCAST_EXCLUDE] && 2225 !psf->sf_count[MCAST_INCLUDE]; 2226 } else 2227 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2228 } 2229 2230 static int sf_setstate(struct ifmcaddr6 *pmc) 2231 { 2232 struct ip6_sf_list *psf, *dpsf; 2233 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2234 int qrv = pmc->idev->mc_qrv; 2235 int new_in, rv; 2236 2237 rv = 0; 2238 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2239 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2240 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2241 !psf->sf_count[MCAST_INCLUDE]; 2242 } else 2243 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2244 if (new_in) { 2245 if (!psf->sf_oldin) { 2246 struct ip6_sf_list *prev = NULL; 2247 2248 for (dpsf = pmc->mca_tomb; dpsf; 2249 dpsf = dpsf->sf_next) { 2250 if (ipv6_addr_equal(&dpsf->sf_addr, 2251 &psf->sf_addr)) 2252 break; 2253 prev = dpsf; 2254 } 2255 if (dpsf) { 2256 if (prev) 2257 prev->sf_next = dpsf->sf_next; 2258 else 2259 pmc->mca_tomb = dpsf->sf_next; 2260 kfree(dpsf); 2261 } 2262 psf->sf_crcount = qrv; 2263 rv++; 2264 } 2265 } else if (psf->sf_oldin) { 2266 psf->sf_crcount = 0; 2267 /* 2268 * add or update "delete" records if an active filter 2269 * is now inactive 2270 */ 2271 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next) 2272 if (ipv6_addr_equal(&dpsf->sf_addr, 2273 &psf->sf_addr)) 2274 break; 2275 if (!dpsf) { 2276 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2277 if (!dpsf) 2278 continue; 2279 *dpsf = *psf; 2280 /* pmc->mca_lock held by callers */ 2281 dpsf->sf_next = pmc->mca_tomb; 2282 pmc->mca_tomb = dpsf; 2283 } 2284 dpsf->sf_crcount = qrv; 2285 rv++; 2286 } 2287 } 2288 return rv; 2289 } 2290 2291 /* 2292 * Add multicast source filter list to the interface list 2293 */ 2294 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2295 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2296 int delta) 2297 { 2298 struct ifmcaddr6 *pmc; 2299 int isexclude; 2300 int i, err; 2301 2302 if (!idev) 2303 return -ENODEV; 2304 read_lock_bh(&idev->lock); 2305 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2306 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2307 break; 2308 } 2309 if (!pmc) { 2310 /* MCA not found?? bug */ 2311 read_unlock_bh(&idev->lock); 2312 return -ESRCH; 2313 } 2314 spin_lock_bh(&pmc->mca_lock); 2315 2316 sf_markstate(pmc); 2317 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2318 if (!delta) 2319 pmc->mca_sfcount[sfmode]++; 2320 err = 0; 2321 for (i = 0; i < sfcount; i++) { 2322 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2323 if (err) 2324 break; 2325 } 2326 if (err) { 2327 int j; 2328 2329 if (!delta) 2330 pmc->mca_sfcount[sfmode]--; 2331 for (j = 0; j < i; j++) 2332 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2333 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2334 struct ip6_sf_list *psf; 2335 2336 /* filter mode change */ 2337 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2338 pmc->mca_sfmode = MCAST_EXCLUDE; 2339 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2340 pmc->mca_sfmode = MCAST_INCLUDE; 2341 /* else no filters; keep old mode for reports */ 2342 2343 pmc->mca_crcount = idev->mc_qrv; 2344 idev->mc_ifc_count = pmc->mca_crcount; 2345 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2346 psf->sf_crcount = 0; 2347 mld_ifc_event(idev); 2348 } else if (sf_setstate(pmc)) 2349 mld_ifc_event(idev); 2350 spin_unlock_bh(&pmc->mca_lock); 2351 read_unlock_bh(&idev->lock); 2352 return err; 2353 } 2354 2355 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2356 { 2357 struct ip6_sf_list *psf, *nextpsf; 2358 2359 for (psf = pmc->mca_tomb; psf; psf = nextpsf) { 2360 nextpsf = psf->sf_next; 2361 kfree(psf); 2362 } 2363 pmc->mca_tomb = NULL; 2364 for (psf = pmc->mca_sources; psf; psf = nextpsf) { 2365 nextpsf = psf->sf_next; 2366 kfree(psf); 2367 } 2368 pmc->mca_sources = NULL; 2369 pmc->mca_sfmode = MCAST_EXCLUDE; 2370 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2371 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2372 } 2373 2374 2375 static void igmp6_join_group(struct ifmcaddr6 *ma) 2376 { 2377 unsigned long delay; 2378 2379 if (ma->mca_flags & MAF_NOREPORT) 2380 return; 2381 2382 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2383 2384 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2385 2386 spin_lock_bh(&ma->mca_lock); 2387 if (del_timer(&ma->mca_timer)) { 2388 atomic_dec(&ma->mca_refcnt); 2389 delay = ma->mca_timer.expires - jiffies; 2390 } 2391 2392 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2393 atomic_inc(&ma->mca_refcnt); 2394 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2395 spin_unlock_bh(&ma->mca_lock); 2396 } 2397 2398 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2399 struct inet6_dev *idev) 2400 { 2401 int err; 2402 2403 /* callers have the socket lock and rtnl lock 2404 * so no other readers or writers of iml or its sflist 2405 */ 2406 if (!iml->sflist) { 2407 /* any-source empty exclude case */ 2408 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2409 } 2410 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2411 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2412 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2413 iml->sflist = NULL; 2414 return err; 2415 } 2416 2417 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2418 { 2419 if (mld_in_v1_mode(ma->idev)) { 2420 if (ma->mca_flags & MAF_LAST_REPORTER) 2421 igmp6_send(&ma->mca_addr, ma->idev->dev, 2422 ICMPV6_MGM_REDUCTION); 2423 } else { 2424 mld_add_delrec(ma->idev, ma); 2425 mld_ifc_event(ma->idev); 2426 } 2427 } 2428 2429 static void mld_gq_timer_expire(unsigned long data) 2430 { 2431 struct inet6_dev *idev = (struct inet6_dev *)data; 2432 2433 idev->mc_gq_running = 0; 2434 mld_send_report(idev, NULL); 2435 in6_dev_put(idev); 2436 } 2437 2438 static void mld_ifc_timer_expire(unsigned long data) 2439 { 2440 struct inet6_dev *idev = (struct inet6_dev *)data; 2441 2442 mld_send_cr(idev); 2443 if (idev->mc_ifc_count) { 2444 idev->mc_ifc_count--; 2445 if (idev->mc_ifc_count) 2446 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2447 } 2448 in6_dev_put(idev); 2449 } 2450 2451 static void mld_ifc_event(struct inet6_dev *idev) 2452 { 2453 if (mld_in_v1_mode(idev)) 2454 return; 2455 idev->mc_ifc_count = idev->mc_qrv; 2456 mld_ifc_start_timer(idev, 1); 2457 } 2458 2459 2460 static void igmp6_timer_handler(unsigned long data) 2461 { 2462 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2463 2464 if (mld_in_v1_mode(ma->idev)) 2465 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2466 else 2467 mld_send_report(ma->idev, ma); 2468 2469 spin_lock(&ma->mca_lock); 2470 ma->mca_flags |= MAF_LAST_REPORTER; 2471 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2472 spin_unlock(&ma->mca_lock); 2473 ma_put(ma); 2474 } 2475 2476 /* Device changing type */ 2477 2478 void ipv6_mc_unmap(struct inet6_dev *idev) 2479 { 2480 struct ifmcaddr6 *i; 2481 2482 /* Install multicast list, except for all-nodes (already installed) */ 2483 2484 read_lock_bh(&idev->lock); 2485 for (i = idev->mc_list; i; i = i->next) 2486 igmp6_group_dropped(i); 2487 read_unlock_bh(&idev->lock); 2488 } 2489 2490 void ipv6_mc_remap(struct inet6_dev *idev) 2491 { 2492 ipv6_mc_up(idev); 2493 } 2494 2495 /* Device going down */ 2496 2497 void ipv6_mc_down(struct inet6_dev *idev) 2498 { 2499 struct ifmcaddr6 *i; 2500 2501 /* Withdraw multicast list */ 2502 2503 read_lock_bh(&idev->lock); 2504 mld_ifc_stop_timer(idev); 2505 mld_gq_stop_timer(idev); 2506 mld_dad_stop_timer(idev); 2507 2508 for (i = idev->mc_list; i; i = i->next) 2509 igmp6_group_dropped(i); 2510 read_unlock_bh(&idev->lock); 2511 2512 mld_clear_delrec(idev); 2513 } 2514 2515 static void ipv6_mc_reset(struct inet6_dev *idev) 2516 { 2517 idev->mc_qrv = sysctl_mld_qrv; 2518 idev->mc_qi = MLD_QI_DEFAULT; 2519 idev->mc_qri = MLD_QRI_DEFAULT; 2520 idev->mc_v1_seen = 0; 2521 idev->mc_maxdelay = unsolicited_report_interval(idev); 2522 } 2523 2524 /* Device going up */ 2525 2526 void ipv6_mc_up(struct inet6_dev *idev) 2527 { 2528 struct ifmcaddr6 *i; 2529 2530 /* Install multicast list, except for all-nodes (already installed) */ 2531 2532 read_lock_bh(&idev->lock); 2533 ipv6_mc_reset(idev); 2534 for (i = idev->mc_list; i; i = i->next) 2535 igmp6_group_added(i); 2536 read_unlock_bh(&idev->lock); 2537 } 2538 2539 /* IPv6 device initialization. */ 2540 2541 void ipv6_mc_init_dev(struct inet6_dev *idev) 2542 { 2543 write_lock_bh(&idev->lock); 2544 spin_lock_init(&idev->mc_lock); 2545 idev->mc_gq_running = 0; 2546 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2547 (unsigned long)idev); 2548 idev->mc_tomb = NULL; 2549 idev->mc_ifc_count = 0; 2550 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2551 (unsigned long)idev); 2552 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, 2553 (unsigned long)idev); 2554 ipv6_mc_reset(idev); 2555 write_unlock_bh(&idev->lock); 2556 } 2557 2558 /* 2559 * Device is about to be destroyed: clean up. 2560 */ 2561 2562 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2563 { 2564 struct ifmcaddr6 *i; 2565 2566 /* Deactivate timers */ 2567 ipv6_mc_down(idev); 2568 2569 /* Delete all-nodes address. */ 2570 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2571 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2572 * fail. 2573 */ 2574 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2575 2576 if (idev->cnf.forwarding) 2577 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2578 2579 write_lock_bh(&idev->lock); 2580 while ((i = idev->mc_list) != NULL) { 2581 idev->mc_list = i->next; 2582 write_unlock_bh(&idev->lock); 2583 2584 igmp6_group_dropped(i); 2585 ma_put(i); 2586 2587 write_lock_bh(&idev->lock); 2588 } 2589 write_unlock_bh(&idev->lock); 2590 } 2591 2592 #ifdef CONFIG_PROC_FS 2593 struct igmp6_mc_iter_state { 2594 struct seq_net_private p; 2595 struct net_device *dev; 2596 struct inet6_dev *idev; 2597 }; 2598 2599 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2600 2601 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2602 { 2603 struct ifmcaddr6 *im = NULL; 2604 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2605 struct net *net = seq_file_net(seq); 2606 2607 state->idev = NULL; 2608 for_each_netdev_rcu(net, state->dev) { 2609 struct inet6_dev *idev; 2610 idev = __in6_dev_get(state->dev); 2611 if (!idev) 2612 continue; 2613 read_lock_bh(&idev->lock); 2614 im = idev->mc_list; 2615 if (im) { 2616 state->idev = idev; 2617 break; 2618 } 2619 read_unlock_bh(&idev->lock); 2620 } 2621 return im; 2622 } 2623 2624 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2625 { 2626 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2627 2628 im = im->next; 2629 while (!im) { 2630 if (likely(state->idev)) 2631 read_unlock_bh(&state->idev->lock); 2632 2633 state->dev = next_net_device_rcu(state->dev); 2634 if (!state->dev) { 2635 state->idev = NULL; 2636 break; 2637 } 2638 state->idev = __in6_dev_get(state->dev); 2639 if (!state->idev) 2640 continue; 2641 read_lock_bh(&state->idev->lock); 2642 im = state->idev->mc_list; 2643 } 2644 return im; 2645 } 2646 2647 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2648 { 2649 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2650 if (im) 2651 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2652 --pos; 2653 return pos ? NULL : im; 2654 } 2655 2656 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2657 __acquires(RCU) 2658 { 2659 rcu_read_lock(); 2660 return igmp6_mc_get_idx(seq, *pos); 2661 } 2662 2663 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2664 { 2665 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2666 2667 ++*pos; 2668 return im; 2669 } 2670 2671 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2672 __releases(RCU) 2673 { 2674 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2675 2676 if (likely(state->idev)) { 2677 read_unlock_bh(&state->idev->lock); 2678 state->idev = NULL; 2679 } 2680 state->dev = NULL; 2681 rcu_read_unlock(); 2682 } 2683 2684 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2685 { 2686 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2687 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2688 2689 seq_printf(seq, 2690 "%-4d %-15s %pi6 %5d %08X %ld\n", 2691 state->dev->ifindex, state->dev->name, 2692 &im->mca_addr, 2693 im->mca_users, im->mca_flags, 2694 (im->mca_flags&MAF_TIMER_RUNNING) ? 2695 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2696 return 0; 2697 } 2698 2699 static const struct seq_operations igmp6_mc_seq_ops = { 2700 .start = igmp6_mc_seq_start, 2701 .next = igmp6_mc_seq_next, 2702 .stop = igmp6_mc_seq_stop, 2703 .show = igmp6_mc_seq_show, 2704 }; 2705 2706 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2707 { 2708 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2709 sizeof(struct igmp6_mc_iter_state)); 2710 } 2711 2712 static const struct file_operations igmp6_mc_seq_fops = { 2713 .owner = THIS_MODULE, 2714 .open = igmp6_mc_seq_open, 2715 .read = seq_read, 2716 .llseek = seq_lseek, 2717 .release = seq_release_net, 2718 }; 2719 2720 struct igmp6_mcf_iter_state { 2721 struct seq_net_private p; 2722 struct net_device *dev; 2723 struct inet6_dev *idev; 2724 struct ifmcaddr6 *im; 2725 }; 2726 2727 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2728 2729 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2730 { 2731 struct ip6_sf_list *psf = NULL; 2732 struct ifmcaddr6 *im = NULL; 2733 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2734 struct net *net = seq_file_net(seq); 2735 2736 state->idev = NULL; 2737 state->im = NULL; 2738 for_each_netdev_rcu(net, state->dev) { 2739 struct inet6_dev *idev; 2740 idev = __in6_dev_get(state->dev); 2741 if (unlikely(idev == NULL)) 2742 continue; 2743 read_lock_bh(&idev->lock); 2744 im = idev->mc_list; 2745 if (likely(im)) { 2746 spin_lock_bh(&im->mca_lock); 2747 psf = im->mca_sources; 2748 if (likely(psf)) { 2749 state->im = im; 2750 state->idev = idev; 2751 break; 2752 } 2753 spin_unlock_bh(&im->mca_lock); 2754 } 2755 read_unlock_bh(&idev->lock); 2756 } 2757 return psf; 2758 } 2759 2760 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2761 { 2762 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2763 2764 psf = psf->sf_next; 2765 while (!psf) { 2766 spin_unlock_bh(&state->im->mca_lock); 2767 state->im = state->im->next; 2768 while (!state->im) { 2769 if (likely(state->idev)) 2770 read_unlock_bh(&state->idev->lock); 2771 2772 state->dev = next_net_device_rcu(state->dev); 2773 if (!state->dev) { 2774 state->idev = NULL; 2775 goto out; 2776 } 2777 state->idev = __in6_dev_get(state->dev); 2778 if (!state->idev) 2779 continue; 2780 read_lock_bh(&state->idev->lock); 2781 state->im = state->idev->mc_list; 2782 } 2783 if (!state->im) 2784 break; 2785 spin_lock_bh(&state->im->mca_lock); 2786 psf = state->im->mca_sources; 2787 } 2788 out: 2789 return psf; 2790 } 2791 2792 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2793 { 2794 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2795 if (psf) 2796 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2797 --pos; 2798 return pos ? NULL : psf; 2799 } 2800 2801 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2802 __acquires(RCU) 2803 { 2804 rcu_read_lock(); 2805 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2806 } 2807 2808 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2809 { 2810 struct ip6_sf_list *psf; 2811 if (v == SEQ_START_TOKEN) 2812 psf = igmp6_mcf_get_first(seq); 2813 else 2814 psf = igmp6_mcf_get_next(seq, v); 2815 ++*pos; 2816 return psf; 2817 } 2818 2819 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2820 __releases(RCU) 2821 { 2822 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2823 if (likely(state->im)) { 2824 spin_unlock_bh(&state->im->mca_lock); 2825 state->im = NULL; 2826 } 2827 if (likely(state->idev)) { 2828 read_unlock_bh(&state->idev->lock); 2829 state->idev = NULL; 2830 } 2831 state->dev = NULL; 2832 rcu_read_unlock(); 2833 } 2834 2835 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2836 { 2837 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2838 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2839 2840 if (v == SEQ_START_TOKEN) { 2841 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 2842 } else { 2843 seq_printf(seq, 2844 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2845 state->dev->ifindex, state->dev->name, 2846 &state->im->mca_addr, 2847 &psf->sf_addr, 2848 psf->sf_count[MCAST_INCLUDE], 2849 psf->sf_count[MCAST_EXCLUDE]); 2850 } 2851 return 0; 2852 } 2853 2854 static const struct seq_operations igmp6_mcf_seq_ops = { 2855 .start = igmp6_mcf_seq_start, 2856 .next = igmp6_mcf_seq_next, 2857 .stop = igmp6_mcf_seq_stop, 2858 .show = igmp6_mcf_seq_show, 2859 }; 2860 2861 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2862 { 2863 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2864 sizeof(struct igmp6_mcf_iter_state)); 2865 } 2866 2867 static const struct file_operations igmp6_mcf_seq_fops = { 2868 .owner = THIS_MODULE, 2869 .open = igmp6_mcf_seq_open, 2870 .read = seq_read, 2871 .llseek = seq_lseek, 2872 .release = seq_release_net, 2873 }; 2874 2875 static int __net_init igmp6_proc_init(struct net *net) 2876 { 2877 int err; 2878 2879 err = -ENOMEM; 2880 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) 2881 goto out; 2882 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, 2883 &igmp6_mcf_seq_fops)) 2884 goto out_proc_net_igmp6; 2885 2886 err = 0; 2887 out: 2888 return err; 2889 2890 out_proc_net_igmp6: 2891 remove_proc_entry("igmp6", net->proc_net); 2892 goto out; 2893 } 2894 2895 static void __net_exit igmp6_proc_exit(struct net *net) 2896 { 2897 remove_proc_entry("mcfilter6", net->proc_net); 2898 remove_proc_entry("igmp6", net->proc_net); 2899 } 2900 #else 2901 static inline int igmp6_proc_init(struct net *net) 2902 { 2903 return 0; 2904 } 2905 static inline void igmp6_proc_exit(struct net *net) 2906 { 2907 } 2908 #endif 2909 2910 static int __net_init igmp6_net_init(struct net *net) 2911 { 2912 int err; 2913 2914 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2915 SOCK_RAW, IPPROTO_ICMPV6, net); 2916 if (err < 0) { 2917 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2918 err); 2919 goto out; 2920 } 2921 2922 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2923 2924 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 2925 SOCK_RAW, IPPROTO_ICMPV6, net); 2926 if (err < 0) { 2927 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 2928 err); 2929 goto out_sock_create; 2930 } 2931 2932 err = igmp6_proc_init(net); 2933 if (err) 2934 goto out_sock_create_autojoin; 2935 2936 return 0; 2937 2938 out_sock_create_autojoin: 2939 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2940 out_sock_create: 2941 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2942 out: 2943 return err; 2944 } 2945 2946 static void __net_exit igmp6_net_exit(struct net *net) 2947 { 2948 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2949 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2950 igmp6_proc_exit(net); 2951 } 2952 2953 static struct pernet_operations igmp6_net_ops = { 2954 .init = igmp6_net_init, 2955 .exit = igmp6_net_exit, 2956 }; 2957 2958 int __init igmp6_init(void) 2959 { 2960 return register_pernet_subsys(&igmp6_net_ops); 2961 } 2962 2963 void igmp6_cleanup(void) 2964 { 2965 unregister_pernet_subsys(&igmp6_net_ops); 2966 } 2967