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