1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Multicast support for IPv6 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 10 */ 11 12 /* Changes: 13 * 14 * yoshfuji : fix format of router-alert option 15 * YOSHIFUJI Hideaki @USAGI: 16 * Fixed source address for MLD message based on 17 * <draft-ietf-magma-mld-source-05.txt>. 18 * YOSHIFUJI Hideaki @USAGI: 19 * - Ignore Queries for invalid addresses. 20 * - MLD for link-local addresses. 21 * David L Stevens <dlstevens@us.ibm.com>: 22 * - MLDv2 support 23 */ 24 25 #include <linux/module.h> 26 #include <linux/errno.h> 27 #include <linux/types.h> 28 #include <linux/string.h> 29 #include <linux/socket.h> 30 #include <linux/sockios.h> 31 #include <linux/jiffies.h> 32 #include <linux/times.h> 33 #include <linux/net.h> 34 #include <linux/in.h> 35 #include <linux/in6.h> 36 #include <linux/netdevice.h> 37 #include <linux/if_arp.h> 38 #include <linux/route.h> 39 #include <linux/init.h> 40 #include <linux/proc_fs.h> 41 #include <linux/seq_file.h> 42 #include <linux/slab.h> 43 #include <linux/pkt_sched.h> 44 #include <net/mld.h> 45 46 #include <linux/netfilter.h> 47 #include <linux/netfilter_ipv6.h> 48 49 #include <net/net_namespace.h> 50 #include <net/sock.h> 51 #include <net/snmp.h> 52 53 #include <net/ipv6.h> 54 #include <net/protocol.h> 55 #include <net/if_inet6.h> 56 #include <net/ndisc.h> 57 #include <net/addrconf.h> 58 #include <net/ip6_route.h> 59 #include <net/inet_common.h> 60 61 #include <net/ip6_checksum.h> 62 63 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 64 static int __mld2_query_bugs[] __attribute__((__unused__)) = { 65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4), 66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4), 67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4) 68 }; 69 70 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 71 72 static void igmp6_join_group(struct ifmcaddr6 *ma); 73 static void igmp6_leave_group(struct ifmcaddr6 *ma); 74 static void igmp6_timer_handler(struct timer_list *t); 75 76 static void mld_gq_timer_expire(struct timer_list *t); 77 static void mld_ifc_timer_expire(struct timer_list *t); 78 static void mld_ifc_event(struct inet6_dev *idev); 79 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 80 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 81 static void mld_clear_delrec(struct inet6_dev *idev); 82 static bool mld_in_v1_mode(const struct inet6_dev *idev); 83 static int sf_setstate(struct ifmcaddr6 *pmc); 84 static void sf_markstate(struct ifmcaddr6 *pmc); 85 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 86 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 87 int sfmode, int sfcount, const struct in6_addr *psfsrc, 88 int delta); 89 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 90 int sfmode, int sfcount, const struct in6_addr *psfsrc, 91 int delta); 92 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 93 struct inet6_dev *idev); 94 static int __ipv6_dev_mc_inc(struct net_device *dev, 95 const struct in6_addr *addr, unsigned int mode); 96 97 #define MLD_QRV_DEFAULT 2 98 /* RFC3810, 9.2. Query Interval */ 99 #define MLD_QI_DEFAULT (125 * HZ) 100 /* RFC3810, 9.3. Query Response Interval */ 101 #define MLD_QRI_DEFAULT (10 * HZ) 102 103 /* RFC3810, 8.1 Query Version Distinctions */ 104 #define MLD_V1_QUERY_LEN 24 105 #define MLD_V2_QUERY_LEN_MIN 28 106 107 #define IPV6_MLD_MAX_MSF 64 108 109 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 110 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; 111 112 /* 113 * socket join on multicast group 114 */ 115 116 #define for_each_pmc_rcu(np, pmc) \ 117 for (pmc = rcu_dereference(np->ipv6_mc_list); \ 118 pmc != NULL; \ 119 pmc = rcu_dereference(pmc->next)) 120 121 static int unsolicited_report_interval(struct inet6_dev *idev) 122 { 123 int iv; 124 125 if (mld_in_v1_mode(idev)) 126 iv = idev->cnf.mldv1_unsolicited_report_interval; 127 else 128 iv = idev->cnf.mldv2_unsolicited_report_interval; 129 130 return iv > 0 ? iv : 1; 131 } 132 133 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, 134 const struct in6_addr *addr, unsigned int mode) 135 { 136 struct net_device *dev = NULL; 137 struct ipv6_mc_socklist *mc_lst; 138 struct ipv6_pinfo *np = inet6_sk(sk); 139 struct net *net = sock_net(sk); 140 int err; 141 142 ASSERT_RTNL(); 143 144 if (!ipv6_addr_is_multicast(addr)) 145 return -EINVAL; 146 147 rcu_read_lock(); 148 for_each_pmc_rcu(np, mc_lst) { 149 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 150 ipv6_addr_equal(&mc_lst->addr, addr)) { 151 rcu_read_unlock(); 152 return -EADDRINUSE; 153 } 154 } 155 rcu_read_unlock(); 156 157 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 158 159 if (!mc_lst) 160 return -ENOMEM; 161 162 mc_lst->next = NULL; 163 mc_lst->addr = *addr; 164 165 if (ifindex == 0) { 166 struct rt6_info *rt; 167 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); 168 if (rt) { 169 dev = rt->dst.dev; 170 ip6_rt_put(rt); 171 } 172 } else 173 dev = __dev_get_by_index(net, ifindex); 174 175 if (!dev) { 176 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 177 return -ENODEV; 178 } 179 180 mc_lst->ifindex = dev->ifindex; 181 mc_lst->sfmode = mode; 182 rwlock_init(&mc_lst->sflock); 183 mc_lst->sflist = NULL; 184 185 /* 186 * now add/increase the group membership on the device 187 */ 188 189 err = __ipv6_dev_mc_inc(dev, addr, mode); 190 191 if (err) { 192 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 193 return err; 194 } 195 196 mc_lst->next = np->ipv6_mc_list; 197 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 198 199 return 0; 200 } 201 202 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 203 { 204 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 205 } 206 EXPORT_SYMBOL(ipv6_sock_mc_join); 207 208 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 209 const struct in6_addr *addr, unsigned int mode) 210 { 211 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 212 } 213 214 /* 215 * socket leave on multicast group 216 */ 217 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 218 { 219 struct ipv6_pinfo *np = inet6_sk(sk); 220 struct ipv6_mc_socklist *mc_lst; 221 struct ipv6_mc_socklist __rcu **lnk; 222 struct net *net = sock_net(sk); 223 224 ASSERT_RTNL(); 225 226 if (!ipv6_addr_is_multicast(addr)) 227 return -EINVAL; 228 229 for (lnk = &np->ipv6_mc_list; 230 (mc_lst = rtnl_dereference(*lnk)) != NULL; 231 lnk = &mc_lst->next) { 232 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 233 ipv6_addr_equal(&mc_lst->addr, addr)) { 234 struct net_device *dev; 235 236 *lnk = mc_lst->next; 237 238 dev = __dev_get_by_index(net, mc_lst->ifindex); 239 if (dev) { 240 struct inet6_dev *idev = __in6_dev_get(dev); 241 242 (void) ip6_mc_leave_src(sk, mc_lst, idev); 243 if (idev) 244 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 245 } else 246 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 247 248 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 249 kfree_rcu(mc_lst, rcu); 250 return 0; 251 } 252 } 253 254 return -EADDRNOTAVAIL; 255 } 256 EXPORT_SYMBOL(ipv6_sock_mc_drop); 257 258 /* called with rcu_read_lock() */ 259 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 260 const struct in6_addr *group, 261 int ifindex) 262 { 263 struct net_device *dev = NULL; 264 struct inet6_dev *idev = NULL; 265 266 if (ifindex == 0) { 267 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0); 268 269 if (rt) { 270 dev = rt->dst.dev; 271 ip6_rt_put(rt); 272 } 273 } else 274 dev = dev_get_by_index_rcu(net, ifindex); 275 276 if (!dev) 277 return NULL; 278 idev = __in6_dev_get(dev); 279 if (!idev) 280 return NULL; 281 read_lock_bh(&idev->lock); 282 if (idev->dead) { 283 read_unlock_bh(&idev->lock); 284 return NULL; 285 } 286 return idev; 287 } 288 289 void __ipv6_sock_mc_close(struct sock *sk) 290 { 291 struct ipv6_pinfo *np = inet6_sk(sk); 292 struct ipv6_mc_socklist *mc_lst; 293 struct net *net = sock_net(sk); 294 295 ASSERT_RTNL(); 296 297 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) { 298 struct net_device *dev; 299 300 np->ipv6_mc_list = mc_lst->next; 301 302 dev = __dev_get_by_index(net, mc_lst->ifindex); 303 if (dev) { 304 struct inet6_dev *idev = __in6_dev_get(dev); 305 306 (void) ip6_mc_leave_src(sk, mc_lst, idev); 307 if (idev) 308 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 309 } else 310 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 311 312 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 313 kfree_rcu(mc_lst, rcu); 314 } 315 } 316 317 void ipv6_sock_mc_close(struct sock *sk) 318 { 319 struct ipv6_pinfo *np = inet6_sk(sk); 320 321 if (!rcu_access_pointer(np->ipv6_mc_list)) 322 return; 323 rtnl_lock(); 324 __ipv6_sock_mc_close(sk); 325 rtnl_unlock(); 326 } 327 328 int ip6_mc_source(int add, int omode, struct sock *sk, 329 struct group_source_req *pgsr) 330 { 331 struct in6_addr *source, *group; 332 struct ipv6_mc_socklist *pmc; 333 struct inet6_dev *idev; 334 struct ipv6_pinfo *inet6 = inet6_sk(sk); 335 struct ip6_sf_socklist *psl; 336 struct net *net = sock_net(sk); 337 int i, j, rv; 338 int leavegroup = 0; 339 int pmclocked = 0; 340 int err; 341 342 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 343 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 344 345 if (!ipv6_addr_is_multicast(group)) 346 return -EINVAL; 347 348 rcu_read_lock(); 349 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 350 if (!idev) { 351 rcu_read_unlock(); 352 return -ENODEV; 353 } 354 355 err = -EADDRNOTAVAIL; 356 357 for_each_pmc_rcu(inet6, pmc) { 358 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 359 continue; 360 if (ipv6_addr_equal(&pmc->addr, group)) 361 break; 362 } 363 if (!pmc) { /* must have a prior join */ 364 err = -EINVAL; 365 goto done; 366 } 367 /* if a source filter was set, must be the same mode as before */ 368 if (pmc->sflist) { 369 if (pmc->sfmode != omode) { 370 err = -EINVAL; 371 goto done; 372 } 373 } else if (pmc->sfmode != omode) { 374 /* allow mode switches for empty-set filters */ 375 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 376 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 377 pmc->sfmode = omode; 378 } 379 380 write_lock(&pmc->sflock); 381 pmclocked = 1; 382 383 psl = pmc->sflist; 384 if (!add) { 385 if (!psl) 386 goto done; /* err = -EADDRNOTAVAIL */ 387 rv = !0; 388 for (i = 0; i < psl->sl_count; i++) { 389 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 390 if (rv == 0) 391 break; 392 } 393 if (rv) /* source not found */ 394 goto done; /* err = -EADDRNOTAVAIL */ 395 396 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 397 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 398 leavegroup = 1; 399 goto done; 400 } 401 402 /* update the interface filter */ 403 ip6_mc_del_src(idev, group, omode, 1, source, 1); 404 405 for (j = i+1; j < psl->sl_count; j++) 406 psl->sl_addr[j-1] = psl->sl_addr[j]; 407 psl->sl_count--; 408 err = 0; 409 goto done; 410 } 411 /* else, add a new source to the filter */ 412 413 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 414 err = -ENOBUFS; 415 goto done; 416 } 417 if (!psl || psl->sl_count == psl->sl_max) { 418 struct ip6_sf_socklist *newpsl; 419 int count = IP6_SFBLOCK; 420 421 if (psl) 422 count += psl->sl_max; 423 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 424 if (!newpsl) { 425 err = -ENOBUFS; 426 goto done; 427 } 428 newpsl->sl_max = count; 429 newpsl->sl_count = count - IP6_SFBLOCK; 430 if (psl) { 431 for (i = 0; i < psl->sl_count; i++) 432 newpsl->sl_addr[i] = psl->sl_addr[i]; 433 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 434 } 435 pmc->sflist = psl = newpsl; 436 } 437 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 438 for (i = 0; i < psl->sl_count; i++) { 439 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 440 if (rv == 0) /* There is an error in the address. */ 441 goto done; 442 } 443 for (j = psl->sl_count-1; j >= i; j--) 444 psl->sl_addr[j+1] = psl->sl_addr[j]; 445 psl->sl_addr[i] = *source; 446 psl->sl_count++; 447 err = 0; 448 /* update the interface list */ 449 ip6_mc_add_src(idev, group, omode, 1, source, 1); 450 done: 451 if (pmclocked) 452 write_unlock(&pmc->sflock); 453 read_unlock_bh(&idev->lock); 454 rcu_read_unlock(); 455 if (leavegroup) 456 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 457 return err; 458 } 459 460 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 461 { 462 const struct in6_addr *group; 463 struct ipv6_mc_socklist *pmc; 464 struct inet6_dev *idev; 465 struct ipv6_pinfo *inet6 = inet6_sk(sk); 466 struct ip6_sf_socklist *newpsl, *psl; 467 struct net *net = sock_net(sk); 468 int leavegroup = 0; 469 int i, err; 470 471 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 472 473 if (!ipv6_addr_is_multicast(group)) 474 return -EINVAL; 475 if (gsf->gf_fmode != MCAST_INCLUDE && 476 gsf->gf_fmode != MCAST_EXCLUDE) 477 return -EINVAL; 478 479 rcu_read_lock(); 480 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 481 482 if (!idev) { 483 rcu_read_unlock(); 484 return -ENODEV; 485 } 486 487 err = 0; 488 489 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 490 leavegroup = 1; 491 goto done; 492 } 493 494 for_each_pmc_rcu(inet6, pmc) { 495 if (pmc->ifindex != gsf->gf_interface) 496 continue; 497 if (ipv6_addr_equal(&pmc->addr, group)) 498 break; 499 } 500 if (!pmc) { /* must have a prior join */ 501 err = -EINVAL; 502 goto done; 503 } 504 if (gsf->gf_numsrc) { 505 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 506 GFP_ATOMIC); 507 if (!newpsl) { 508 err = -ENOBUFS; 509 goto done; 510 } 511 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 512 for (i = 0; i < newpsl->sl_count; ++i) { 513 struct sockaddr_in6 *psin6; 514 515 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 516 newpsl->sl_addr[i] = psin6->sin6_addr; 517 } 518 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 519 newpsl->sl_count, newpsl->sl_addr, 0); 520 if (err) { 521 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 522 goto done; 523 } 524 } else { 525 newpsl = NULL; 526 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 527 } 528 529 write_lock(&pmc->sflock); 530 psl = pmc->sflist; 531 if (psl) { 532 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 533 psl->sl_count, psl->sl_addr, 0); 534 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 535 } else 536 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 537 pmc->sflist = newpsl; 538 pmc->sfmode = gsf->gf_fmode; 539 write_unlock(&pmc->sflock); 540 err = 0; 541 done: 542 read_unlock_bh(&idev->lock); 543 rcu_read_unlock(); 544 if (leavegroup) 545 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 546 return err; 547 } 548 549 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 550 struct group_filter __user *optval, int __user *optlen) 551 { 552 int err, i, count, copycount; 553 const struct in6_addr *group; 554 struct ipv6_mc_socklist *pmc; 555 struct inet6_dev *idev; 556 struct ipv6_pinfo *inet6 = inet6_sk(sk); 557 struct ip6_sf_socklist *psl; 558 struct net *net = sock_net(sk); 559 560 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 561 562 if (!ipv6_addr_is_multicast(group)) 563 return -EINVAL; 564 565 rcu_read_lock(); 566 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 567 568 if (!idev) { 569 rcu_read_unlock(); 570 return -ENODEV; 571 } 572 573 err = -EADDRNOTAVAIL; 574 /* changes to the ipv6_mc_list require the socket lock and 575 * rtnl lock. We have the socket lock and rcu read lock, 576 * so reading the list is safe. 577 */ 578 579 for_each_pmc_rcu(inet6, pmc) { 580 if (pmc->ifindex != gsf->gf_interface) 581 continue; 582 if (ipv6_addr_equal(group, &pmc->addr)) 583 break; 584 } 585 if (!pmc) /* must have a prior join */ 586 goto done; 587 gsf->gf_fmode = pmc->sfmode; 588 psl = pmc->sflist; 589 count = psl ? psl->sl_count : 0; 590 read_unlock_bh(&idev->lock); 591 rcu_read_unlock(); 592 593 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 594 gsf->gf_numsrc = count; 595 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 596 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 597 return -EFAULT; 598 } 599 /* changes to psl require the socket lock, and a write lock 600 * on pmc->sflock. We have the socket lock so reading here is safe. 601 */ 602 for (i = 0; i < copycount; i++) { 603 struct sockaddr_in6 *psin6; 604 struct sockaddr_storage ss; 605 606 psin6 = (struct sockaddr_in6 *)&ss; 607 memset(&ss, 0, sizeof(ss)); 608 psin6->sin6_family = AF_INET6; 609 psin6->sin6_addr = psl->sl_addr[i]; 610 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 611 return -EFAULT; 612 } 613 return 0; 614 done: 615 read_unlock_bh(&idev->lock); 616 rcu_read_unlock(); 617 return err; 618 } 619 620 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 621 const struct in6_addr *src_addr) 622 { 623 struct ipv6_pinfo *np = inet6_sk(sk); 624 struct ipv6_mc_socklist *mc; 625 struct ip6_sf_socklist *psl; 626 bool rv = true; 627 628 rcu_read_lock(); 629 for_each_pmc_rcu(np, mc) { 630 if (ipv6_addr_equal(&mc->addr, mc_addr)) 631 break; 632 } 633 if (!mc) { 634 rcu_read_unlock(); 635 return np->mc_all; 636 } 637 read_lock(&mc->sflock); 638 psl = mc->sflist; 639 if (!psl) { 640 rv = mc->sfmode == MCAST_EXCLUDE; 641 } else { 642 int i; 643 644 for (i = 0; i < psl->sl_count; i++) { 645 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 646 break; 647 } 648 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 649 rv = false; 650 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 651 rv = false; 652 } 653 read_unlock(&mc->sflock); 654 rcu_read_unlock(); 655 656 return rv; 657 } 658 659 static void igmp6_group_added(struct ifmcaddr6 *mc) 660 { 661 struct net_device *dev = mc->idev->dev; 662 char buf[MAX_ADDR_LEN]; 663 664 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 665 IPV6_ADDR_SCOPE_LINKLOCAL) 666 return; 667 668 spin_lock_bh(&mc->mca_lock); 669 if (!(mc->mca_flags&MAF_LOADED)) { 670 mc->mca_flags |= MAF_LOADED; 671 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 672 dev_mc_add(dev, buf); 673 } 674 spin_unlock_bh(&mc->mca_lock); 675 676 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 677 return; 678 679 if (mld_in_v1_mode(mc->idev)) { 680 igmp6_join_group(mc); 681 return; 682 } 683 /* else v2 */ 684 685 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 686 * should not send filter-mode change record as the mode 687 * should be from IN() to IN(A). 688 */ 689 if (mc->mca_sfmode == MCAST_EXCLUDE) 690 mc->mca_crcount = mc->idev->mc_qrv; 691 692 mld_ifc_event(mc->idev); 693 } 694 695 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 696 { 697 struct net_device *dev = mc->idev->dev; 698 char buf[MAX_ADDR_LEN]; 699 700 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 701 IPV6_ADDR_SCOPE_LINKLOCAL) 702 return; 703 704 spin_lock_bh(&mc->mca_lock); 705 if (mc->mca_flags&MAF_LOADED) { 706 mc->mca_flags &= ~MAF_LOADED; 707 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 708 dev_mc_del(dev, buf); 709 } 710 711 spin_unlock_bh(&mc->mca_lock); 712 if (mc->mca_flags & MAF_NOREPORT) 713 return; 714 715 if (!mc->idev->dead) 716 igmp6_leave_group(mc); 717 718 spin_lock_bh(&mc->mca_lock); 719 if (del_timer(&mc->mca_timer)) 720 refcount_dec(&mc->mca_refcnt); 721 spin_unlock_bh(&mc->mca_lock); 722 } 723 724 /* 725 * deleted ifmcaddr6 manipulation 726 */ 727 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 728 { 729 struct ifmcaddr6 *pmc; 730 731 /* this is an "ifmcaddr6" for convenience; only the fields below 732 * are actually used. In particular, the refcnt and users are not 733 * used for management of the delete list. Using the same structure 734 * for deleted items allows change reports to use common code with 735 * non-deleted or query-response MCA's. 736 */ 737 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 738 if (!pmc) 739 return; 740 741 spin_lock_bh(&im->mca_lock); 742 spin_lock_init(&pmc->mca_lock); 743 pmc->idev = im->idev; 744 in6_dev_hold(idev); 745 pmc->mca_addr = im->mca_addr; 746 pmc->mca_crcount = idev->mc_qrv; 747 pmc->mca_sfmode = im->mca_sfmode; 748 if (pmc->mca_sfmode == MCAST_INCLUDE) { 749 struct ip6_sf_list *psf; 750 751 pmc->mca_tomb = im->mca_tomb; 752 pmc->mca_sources = im->mca_sources; 753 im->mca_tomb = im->mca_sources = NULL; 754 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 755 psf->sf_crcount = pmc->mca_crcount; 756 } 757 spin_unlock_bh(&im->mca_lock); 758 759 spin_lock_bh(&idev->mc_lock); 760 pmc->next = idev->mc_tomb; 761 idev->mc_tomb = pmc; 762 spin_unlock_bh(&idev->mc_lock); 763 } 764 765 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 766 { 767 struct ifmcaddr6 *pmc, *pmc_prev; 768 struct ip6_sf_list *psf; 769 struct in6_addr *pmca = &im->mca_addr; 770 771 spin_lock_bh(&idev->mc_lock); 772 pmc_prev = NULL; 773 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) { 774 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 775 break; 776 pmc_prev = pmc; 777 } 778 if (pmc) { 779 if (pmc_prev) 780 pmc_prev->next = pmc->next; 781 else 782 idev->mc_tomb = pmc->next; 783 } 784 spin_unlock_bh(&idev->mc_lock); 785 786 spin_lock_bh(&im->mca_lock); 787 if (pmc) { 788 im->idev = pmc->idev; 789 if (im->mca_sfmode == MCAST_INCLUDE) { 790 swap(im->mca_tomb, pmc->mca_tomb); 791 swap(im->mca_sources, pmc->mca_sources); 792 for (psf = im->mca_sources; psf; psf = psf->sf_next) 793 psf->sf_crcount = idev->mc_qrv; 794 } else { 795 im->mca_crcount = idev->mc_qrv; 796 } 797 in6_dev_put(pmc->idev); 798 ip6_mc_clear_src(pmc); 799 kfree(pmc); 800 } 801 spin_unlock_bh(&im->mca_lock); 802 } 803 804 static void mld_clear_delrec(struct inet6_dev *idev) 805 { 806 struct ifmcaddr6 *pmc, *nextpmc; 807 808 spin_lock_bh(&idev->mc_lock); 809 pmc = idev->mc_tomb; 810 idev->mc_tomb = NULL; 811 spin_unlock_bh(&idev->mc_lock); 812 813 for (; pmc; pmc = nextpmc) { 814 nextpmc = pmc->next; 815 ip6_mc_clear_src(pmc); 816 in6_dev_put(pmc->idev); 817 kfree(pmc); 818 } 819 820 /* clear dead sources, too */ 821 read_lock_bh(&idev->lock); 822 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 823 struct ip6_sf_list *psf, *psf_next; 824 825 spin_lock_bh(&pmc->mca_lock); 826 psf = pmc->mca_tomb; 827 pmc->mca_tomb = NULL; 828 spin_unlock_bh(&pmc->mca_lock); 829 for (; psf; psf = psf_next) { 830 psf_next = psf->sf_next; 831 kfree(psf); 832 } 833 } 834 read_unlock_bh(&idev->lock); 835 } 836 837 static void mca_get(struct ifmcaddr6 *mc) 838 { 839 refcount_inc(&mc->mca_refcnt); 840 } 841 842 static void ma_put(struct ifmcaddr6 *mc) 843 { 844 if (refcount_dec_and_test(&mc->mca_refcnt)) { 845 in6_dev_put(mc->idev); 846 kfree(mc); 847 } 848 } 849 850 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 851 const struct in6_addr *addr, 852 unsigned int mode) 853 { 854 struct ifmcaddr6 *mc; 855 856 mc = kzalloc(sizeof(*mc), GFP_ATOMIC); 857 if (!mc) 858 return NULL; 859 860 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0); 861 862 mc->mca_addr = *addr; 863 mc->idev = idev; /* reference taken by caller */ 864 mc->mca_users = 1; 865 /* mca_stamp should be updated upon changes */ 866 mc->mca_cstamp = mc->mca_tstamp = jiffies; 867 refcount_set(&mc->mca_refcnt, 1); 868 spin_lock_init(&mc->mca_lock); 869 870 mc->mca_sfmode = mode; 871 mc->mca_sfcount[mode] = 1; 872 873 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 874 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 875 mc->mca_flags |= MAF_NOREPORT; 876 877 return mc; 878 } 879 880 /* 881 * device multicast group inc (add if not found) 882 */ 883 static int __ipv6_dev_mc_inc(struct net_device *dev, 884 const struct in6_addr *addr, unsigned int mode) 885 { 886 struct ifmcaddr6 *mc; 887 struct inet6_dev *idev; 888 889 ASSERT_RTNL(); 890 891 /* we need to take a reference on idev */ 892 idev = in6_dev_get(dev); 893 894 if (!idev) 895 return -EINVAL; 896 897 write_lock_bh(&idev->lock); 898 if (idev->dead) { 899 write_unlock_bh(&idev->lock); 900 in6_dev_put(idev); 901 return -ENODEV; 902 } 903 904 for (mc = idev->mc_list; mc; mc = mc->next) { 905 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 906 mc->mca_users++; 907 write_unlock_bh(&idev->lock); 908 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 909 in6_dev_put(idev); 910 return 0; 911 } 912 } 913 914 mc = mca_alloc(idev, addr, mode); 915 if (!mc) { 916 write_unlock_bh(&idev->lock); 917 in6_dev_put(idev); 918 return -ENOMEM; 919 } 920 921 mc->next = idev->mc_list; 922 idev->mc_list = mc; 923 924 /* Hold this for the code below before we unlock, 925 * it is already exposed via idev->mc_list. 926 */ 927 mca_get(mc); 928 write_unlock_bh(&idev->lock); 929 930 mld_del_delrec(idev, mc); 931 igmp6_group_added(mc); 932 ma_put(mc); 933 return 0; 934 } 935 936 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 937 { 938 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 939 } 940 EXPORT_SYMBOL(ipv6_dev_mc_inc); 941 942 /* 943 * device multicast group del 944 */ 945 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 946 { 947 struct ifmcaddr6 *ma, **map; 948 949 ASSERT_RTNL(); 950 951 write_lock_bh(&idev->lock); 952 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) { 953 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 954 if (--ma->mca_users == 0) { 955 *map = ma->next; 956 write_unlock_bh(&idev->lock); 957 958 igmp6_group_dropped(ma); 959 ip6_mc_clear_src(ma); 960 961 ma_put(ma); 962 return 0; 963 } 964 write_unlock_bh(&idev->lock); 965 return 0; 966 } 967 } 968 write_unlock_bh(&idev->lock); 969 970 return -ENOENT; 971 } 972 973 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 974 { 975 struct inet6_dev *idev; 976 int err; 977 978 ASSERT_RTNL(); 979 980 idev = __in6_dev_get(dev); 981 if (!idev) 982 err = -ENODEV; 983 else 984 err = __ipv6_dev_mc_dec(idev, addr); 985 986 return err; 987 } 988 EXPORT_SYMBOL(ipv6_dev_mc_dec); 989 990 /* 991 * check if the interface/address pair is valid 992 */ 993 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 994 const struct in6_addr *src_addr) 995 { 996 struct inet6_dev *idev; 997 struct ifmcaddr6 *mc; 998 bool rv = false; 999 1000 rcu_read_lock(); 1001 idev = __in6_dev_get(dev); 1002 if (idev) { 1003 read_lock_bh(&idev->lock); 1004 for (mc = idev->mc_list; mc; mc = mc->next) { 1005 if (ipv6_addr_equal(&mc->mca_addr, group)) 1006 break; 1007 } 1008 if (mc) { 1009 if (src_addr && !ipv6_addr_any(src_addr)) { 1010 struct ip6_sf_list *psf; 1011 1012 spin_lock_bh(&mc->mca_lock); 1013 for (psf = mc->mca_sources; psf; psf = psf->sf_next) { 1014 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1015 break; 1016 } 1017 if (psf) 1018 rv = psf->sf_count[MCAST_INCLUDE] || 1019 psf->sf_count[MCAST_EXCLUDE] != 1020 mc->mca_sfcount[MCAST_EXCLUDE]; 1021 else 1022 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; 1023 spin_unlock_bh(&mc->mca_lock); 1024 } else 1025 rv = true; /* don't filter unspecified source */ 1026 } 1027 read_unlock_bh(&idev->lock); 1028 } 1029 rcu_read_unlock(); 1030 return rv; 1031 } 1032 1033 static void mld_gq_start_timer(struct inet6_dev *idev) 1034 { 1035 unsigned long tv = prandom_u32() % idev->mc_maxdelay; 1036 1037 idev->mc_gq_running = 1; 1038 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1039 in6_dev_hold(idev); 1040 } 1041 1042 static void mld_gq_stop_timer(struct inet6_dev *idev) 1043 { 1044 idev->mc_gq_running = 0; 1045 if (del_timer(&idev->mc_gq_timer)) 1046 __in6_dev_put(idev); 1047 } 1048 1049 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) 1050 { 1051 unsigned long tv = prandom_u32() % delay; 1052 1053 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1054 in6_dev_hold(idev); 1055 } 1056 1057 static void mld_ifc_stop_timer(struct inet6_dev *idev) 1058 { 1059 idev->mc_ifc_count = 0; 1060 if (del_timer(&idev->mc_ifc_timer)) 1061 __in6_dev_put(idev); 1062 } 1063 1064 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) 1065 { 1066 unsigned long tv = prandom_u32() % delay; 1067 1068 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) 1069 in6_dev_hold(idev); 1070 } 1071 1072 static void mld_dad_stop_timer(struct inet6_dev *idev) 1073 { 1074 if (del_timer(&idev->mc_dad_timer)) 1075 __in6_dev_put(idev); 1076 } 1077 1078 /* 1079 * IGMP handling (alias multicast ICMPv6 messages) 1080 */ 1081 1082 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1083 { 1084 unsigned long delay = resptime; 1085 1086 /* Do not start timer for these addresses */ 1087 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1088 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1089 return; 1090 1091 if (del_timer(&ma->mca_timer)) { 1092 refcount_dec(&ma->mca_refcnt); 1093 delay = ma->mca_timer.expires - jiffies; 1094 } 1095 1096 if (delay >= resptime) 1097 delay = prandom_u32() % resptime; 1098 1099 ma->mca_timer.expires = jiffies + delay; 1100 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1101 refcount_inc(&ma->mca_refcnt); 1102 ma->mca_flags |= MAF_TIMER_RUNNING; 1103 } 1104 1105 /* mark EXCLUDE-mode sources */ 1106 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1107 const struct in6_addr *srcs) 1108 { 1109 struct ip6_sf_list *psf; 1110 int i, scount; 1111 1112 scount = 0; 1113 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1114 if (scount == nsrcs) 1115 break; 1116 for (i = 0; i < nsrcs; i++) { 1117 /* skip inactive filters */ 1118 if (psf->sf_count[MCAST_INCLUDE] || 1119 pmc->mca_sfcount[MCAST_EXCLUDE] != 1120 psf->sf_count[MCAST_EXCLUDE]) 1121 break; 1122 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1123 scount++; 1124 break; 1125 } 1126 } 1127 } 1128 pmc->mca_flags &= ~MAF_GSQUERY; 1129 if (scount == nsrcs) /* all sources excluded */ 1130 return false; 1131 return true; 1132 } 1133 1134 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1135 const struct in6_addr *srcs) 1136 { 1137 struct ip6_sf_list *psf; 1138 int i, scount; 1139 1140 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1141 return mld_xmarksources(pmc, nsrcs, srcs); 1142 1143 /* mark INCLUDE-mode sources */ 1144 1145 scount = 0; 1146 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1147 if (scount == nsrcs) 1148 break; 1149 for (i = 0; i < nsrcs; i++) { 1150 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1151 psf->sf_gsresp = 1; 1152 scount++; 1153 break; 1154 } 1155 } 1156 } 1157 if (!scount) { 1158 pmc->mca_flags &= ~MAF_GSQUERY; 1159 return false; 1160 } 1161 pmc->mca_flags |= MAF_GSQUERY; 1162 return true; 1163 } 1164 1165 static int mld_force_mld_version(const struct inet6_dev *idev) 1166 { 1167 /* Normally, both are 0 here. If enforcement to a particular is 1168 * being used, individual device enforcement will have a lower 1169 * precedence over 'all' device (.../conf/all/force_mld_version). 1170 */ 1171 1172 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1173 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1174 else 1175 return idev->cnf.force_mld_version; 1176 } 1177 1178 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1179 { 1180 return mld_force_mld_version(idev) == 2; 1181 } 1182 1183 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1184 { 1185 return mld_force_mld_version(idev) == 1; 1186 } 1187 1188 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1189 { 1190 if (mld_in_v2_mode_only(idev)) 1191 return false; 1192 if (mld_in_v1_mode_only(idev)) 1193 return true; 1194 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1195 return true; 1196 1197 return false; 1198 } 1199 1200 static void mld_set_v1_mode(struct inet6_dev *idev) 1201 { 1202 /* RFC3810, relevant sections: 1203 * - 9.1. Robustness Variable 1204 * - 9.2. Query Interval 1205 * - 9.3. Query Response Interval 1206 * - 9.12. Older Version Querier Present Timeout 1207 */ 1208 unsigned long switchback; 1209 1210 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1211 1212 idev->mc_v1_seen = jiffies + switchback; 1213 } 1214 1215 static void mld_update_qrv(struct inet6_dev *idev, 1216 const struct mld2_query *mlh2) 1217 { 1218 /* RFC3810, relevant sections: 1219 * - 5.1.8. QRV (Querier's Robustness Variable) 1220 * - 9.1. Robustness Variable 1221 */ 1222 1223 /* The value of the Robustness Variable MUST NOT be zero, 1224 * and SHOULD NOT be one. Catch this here if we ever run 1225 * into such a case in future. 1226 */ 1227 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1228 WARN_ON(idev->mc_qrv == 0); 1229 1230 if (mlh2->mld2q_qrv > 0) 1231 idev->mc_qrv = mlh2->mld2q_qrv; 1232 1233 if (unlikely(idev->mc_qrv < min_qrv)) { 1234 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1235 idev->mc_qrv, min_qrv); 1236 idev->mc_qrv = min_qrv; 1237 } 1238 } 1239 1240 static void mld_update_qi(struct inet6_dev *idev, 1241 const struct mld2_query *mlh2) 1242 { 1243 /* RFC3810, relevant sections: 1244 * - 5.1.9. QQIC (Querier's Query Interval Code) 1245 * - 9.2. Query Interval 1246 * - 9.12. Older Version Querier Present Timeout 1247 * (the [Query Interval] in the last Query received) 1248 */ 1249 unsigned long mc_qqi; 1250 1251 if (mlh2->mld2q_qqic < 128) { 1252 mc_qqi = mlh2->mld2q_qqic; 1253 } else { 1254 unsigned long mc_man, mc_exp; 1255 1256 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1257 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1258 1259 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1260 } 1261 1262 idev->mc_qi = mc_qqi * HZ; 1263 } 1264 1265 static void mld_update_qri(struct inet6_dev *idev, 1266 const struct mld2_query *mlh2) 1267 { 1268 /* RFC3810, relevant sections: 1269 * - 5.1.3. Maximum Response Code 1270 * - 9.3. Query Response Interval 1271 */ 1272 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1273 } 1274 1275 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1276 unsigned long *max_delay, bool v1_query) 1277 { 1278 unsigned long mldv1_md; 1279 1280 /* Ignore v1 queries */ 1281 if (mld_in_v2_mode_only(idev)) 1282 return -EINVAL; 1283 1284 mldv1_md = ntohs(mld->mld_maxdelay); 1285 1286 /* When in MLDv1 fallback and a MLDv2 router start-up being 1287 * unaware of current MLDv1 operation, the MRC == MRD mapping 1288 * only works when the exponential algorithm is not being 1289 * used (as MLDv1 is unaware of such things). 1290 * 1291 * According to the RFC author, the MLDv2 implementations 1292 * he's aware of all use a MRC < 32768 on start up queries. 1293 * 1294 * Thus, should we *ever* encounter something else larger 1295 * than that, just assume the maximum possible within our 1296 * reach. 1297 */ 1298 if (!v1_query) 1299 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1300 1301 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1302 1303 /* MLDv1 router present: we need to go into v1 mode *only* 1304 * when an MLDv1 query is received as per section 9.12. of 1305 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1306 * queries MUST be of exactly 24 octets. 1307 */ 1308 if (v1_query) 1309 mld_set_v1_mode(idev); 1310 1311 /* cancel MLDv2 report timer */ 1312 mld_gq_stop_timer(idev); 1313 /* cancel the interface change timer */ 1314 mld_ifc_stop_timer(idev); 1315 /* clear deleted report items */ 1316 mld_clear_delrec(idev); 1317 1318 return 0; 1319 } 1320 1321 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1322 unsigned long *max_delay) 1323 { 1324 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1325 1326 mld_update_qrv(idev, mld); 1327 mld_update_qi(idev, mld); 1328 mld_update_qri(idev, mld); 1329 1330 idev->mc_maxdelay = *max_delay; 1331 1332 return 0; 1333 } 1334 1335 /* called with rcu_read_lock() */ 1336 int igmp6_event_query(struct sk_buff *skb) 1337 { 1338 struct mld2_query *mlh2 = NULL; 1339 struct ifmcaddr6 *ma; 1340 const struct in6_addr *group; 1341 unsigned long max_delay; 1342 struct inet6_dev *idev; 1343 struct mld_msg *mld; 1344 int group_type; 1345 int mark = 0; 1346 int len, err; 1347 1348 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1349 return -EINVAL; 1350 1351 /* compute payload length excluding extension headers */ 1352 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1353 len -= skb_network_header_len(skb); 1354 1355 /* RFC3810 6.2 1356 * Upon reception of an MLD message that contains a Query, the node 1357 * checks if the source address of the message is a valid link-local 1358 * address, if the Hop Limit is set to 1, and if the Router Alert 1359 * option is present in the Hop-By-Hop Options header of the IPv6 1360 * packet. If any of these checks fails, the packet is dropped. 1361 */ 1362 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1363 ipv6_hdr(skb)->hop_limit != 1 || 1364 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1365 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1366 return -EINVAL; 1367 1368 idev = __in6_dev_get(skb->dev); 1369 if (!idev) 1370 return 0; 1371 1372 mld = (struct mld_msg *)icmp6_hdr(skb); 1373 group = &mld->mld_mca; 1374 group_type = ipv6_addr_type(group); 1375 1376 if (group_type != IPV6_ADDR_ANY && 1377 !(group_type&IPV6_ADDR_MULTICAST)) 1378 return -EINVAL; 1379 1380 if (len < MLD_V1_QUERY_LEN) { 1381 return -EINVAL; 1382 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1383 err = mld_process_v1(idev, mld, &max_delay, 1384 len == MLD_V1_QUERY_LEN); 1385 if (err < 0) 1386 return err; 1387 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1388 int srcs_offset = sizeof(struct mld2_query) - 1389 sizeof(struct icmp6hdr); 1390 1391 if (!pskb_may_pull(skb, srcs_offset)) 1392 return -EINVAL; 1393 1394 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1395 1396 err = mld_process_v2(idev, mlh2, &max_delay); 1397 if (err < 0) 1398 return err; 1399 1400 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1401 if (mlh2->mld2q_nsrcs) 1402 return -EINVAL; /* no sources allowed */ 1403 1404 mld_gq_start_timer(idev); 1405 return 0; 1406 } 1407 /* mark sources to include, if group & source-specific */ 1408 if (mlh2->mld2q_nsrcs != 0) { 1409 if (!pskb_may_pull(skb, srcs_offset + 1410 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1411 return -EINVAL; 1412 1413 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1414 mark = 1; 1415 } 1416 } else { 1417 return -EINVAL; 1418 } 1419 1420 read_lock_bh(&idev->lock); 1421 if (group_type == IPV6_ADDR_ANY) { 1422 for (ma = idev->mc_list; ma; ma = ma->next) { 1423 spin_lock_bh(&ma->mca_lock); 1424 igmp6_group_queried(ma, max_delay); 1425 spin_unlock_bh(&ma->mca_lock); 1426 } 1427 } else { 1428 for (ma = idev->mc_list; ma; ma = ma->next) { 1429 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1430 continue; 1431 spin_lock_bh(&ma->mca_lock); 1432 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1433 /* gsquery <- gsquery && mark */ 1434 if (!mark) 1435 ma->mca_flags &= ~MAF_GSQUERY; 1436 } else { 1437 /* gsquery <- mark */ 1438 if (mark) 1439 ma->mca_flags |= MAF_GSQUERY; 1440 else 1441 ma->mca_flags &= ~MAF_GSQUERY; 1442 } 1443 if (!(ma->mca_flags & MAF_GSQUERY) || 1444 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1445 igmp6_group_queried(ma, max_delay); 1446 spin_unlock_bh(&ma->mca_lock); 1447 break; 1448 } 1449 } 1450 read_unlock_bh(&idev->lock); 1451 1452 return 0; 1453 } 1454 1455 /* called with rcu_read_lock() */ 1456 int igmp6_event_report(struct sk_buff *skb) 1457 { 1458 struct ifmcaddr6 *ma; 1459 struct inet6_dev *idev; 1460 struct mld_msg *mld; 1461 int addr_type; 1462 1463 /* Our own report looped back. Ignore it. */ 1464 if (skb->pkt_type == PACKET_LOOPBACK) 1465 return 0; 1466 1467 /* send our report if the MC router may not have heard this report */ 1468 if (skb->pkt_type != PACKET_MULTICAST && 1469 skb->pkt_type != PACKET_BROADCAST) 1470 return 0; 1471 1472 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1473 return -EINVAL; 1474 1475 mld = (struct mld_msg *)icmp6_hdr(skb); 1476 1477 /* Drop reports with not link local source */ 1478 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1479 if (addr_type != IPV6_ADDR_ANY && 1480 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1481 return -EINVAL; 1482 1483 idev = __in6_dev_get(skb->dev); 1484 if (!idev) 1485 return -ENODEV; 1486 1487 /* 1488 * Cancel the timer for this group 1489 */ 1490 1491 read_lock_bh(&idev->lock); 1492 for (ma = idev->mc_list; ma; ma = ma->next) { 1493 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1494 spin_lock(&ma->mca_lock); 1495 if (del_timer(&ma->mca_timer)) 1496 refcount_dec(&ma->mca_refcnt); 1497 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1498 spin_unlock(&ma->mca_lock); 1499 break; 1500 } 1501 } 1502 read_unlock_bh(&idev->lock); 1503 return 0; 1504 } 1505 1506 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1507 int gdeleted, int sdeleted) 1508 { 1509 switch (type) { 1510 case MLD2_MODE_IS_INCLUDE: 1511 case MLD2_MODE_IS_EXCLUDE: 1512 if (gdeleted || sdeleted) 1513 return false; 1514 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1515 if (pmc->mca_sfmode == MCAST_INCLUDE) 1516 return true; 1517 /* don't include if this source is excluded 1518 * in all filters 1519 */ 1520 if (psf->sf_count[MCAST_INCLUDE]) 1521 return type == MLD2_MODE_IS_INCLUDE; 1522 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1523 psf->sf_count[MCAST_EXCLUDE]; 1524 } 1525 return false; 1526 case MLD2_CHANGE_TO_INCLUDE: 1527 if (gdeleted || sdeleted) 1528 return false; 1529 return psf->sf_count[MCAST_INCLUDE] != 0; 1530 case MLD2_CHANGE_TO_EXCLUDE: 1531 if (gdeleted || sdeleted) 1532 return false; 1533 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1534 psf->sf_count[MCAST_INCLUDE]) 1535 return false; 1536 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1537 psf->sf_count[MCAST_EXCLUDE]; 1538 case MLD2_ALLOW_NEW_SOURCES: 1539 if (gdeleted || !psf->sf_crcount) 1540 return false; 1541 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1542 case MLD2_BLOCK_OLD_SOURCES: 1543 if (pmc->mca_sfmode == MCAST_INCLUDE) 1544 return gdeleted || (psf->sf_crcount && sdeleted); 1545 return psf->sf_crcount && !gdeleted && !sdeleted; 1546 } 1547 return false; 1548 } 1549 1550 static int 1551 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1552 { 1553 struct ip6_sf_list *psf; 1554 int scount = 0; 1555 1556 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 1557 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1558 continue; 1559 scount++; 1560 } 1561 return scount; 1562 } 1563 1564 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1565 struct net_device *dev, 1566 const struct in6_addr *saddr, 1567 const struct in6_addr *daddr, 1568 int proto, int len) 1569 { 1570 struct ipv6hdr *hdr; 1571 1572 skb->protocol = htons(ETH_P_IPV6); 1573 skb->dev = dev; 1574 1575 skb_reset_network_header(skb); 1576 skb_put(skb, sizeof(struct ipv6hdr)); 1577 hdr = ipv6_hdr(skb); 1578 1579 ip6_flow_hdr(hdr, 0, 0); 1580 1581 hdr->payload_len = htons(len); 1582 hdr->nexthdr = proto; 1583 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1584 1585 hdr->saddr = *saddr; 1586 hdr->daddr = *daddr; 1587 } 1588 1589 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1590 { 1591 struct net_device *dev = idev->dev; 1592 struct net *net = dev_net(dev); 1593 struct sock *sk = net->ipv6.igmp_sk; 1594 struct sk_buff *skb; 1595 struct mld2_report *pmr; 1596 struct in6_addr addr_buf; 1597 const struct in6_addr *saddr; 1598 int hlen = LL_RESERVED_SPACE(dev); 1599 int tlen = dev->needed_tailroom; 1600 unsigned int size = mtu + hlen + tlen; 1601 int err; 1602 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1603 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1604 IPV6_TLV_PADN, 0 }; 1605 1606 /* we assume size > sizeof(ra) here */ 1607 /* limit our allocations to order-0 page */ 1608 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1609 skb = sock_alloc_send_skb(sk, size, 1, &err); 1610 1611 if (!skb) 1612 return NULL; 1613 1614 skb->priority = TC_PRIO_CONTROL; 1615 skb_reserve(skb, hlen); 1616 skb_tailroom_reserve(skb, mtu, tlen); 1617 1618 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1619 /* <draft-ietf-magma-mld-source-05.txt>: 1620 * use unspecified address as the source address 1621 * when a valid link-local address is not available. 1622 */ 1623 saddr = &in6addr_any; 1624 } else 1625 saddr = &addr_buf; 1626 1627 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1628 1629 skb_put_data(skb, ra, sizeof(ra)); 1630 1631 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1632 skb_put(skb, sizeof(*pmr)); 1633 pmr = (struct mld2_report *)skb_transport_header(skb); 1634 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1635 pmr->mld2r_resv1 = 0; 1636 pmr->mld2r_cksum = 0; 1637 pmr->mld2r_resv2 = 0; 1638 pmr->mld2r_ngrec = 0; 1639 return skb; 1640 } 1641 1642 static void mld_sendpack(struct sk_buff *skb) 1643 { 1644 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1645 struct mld2_report *pmr = 1646 (struct mld2_report *)skb_transport_header(skb); 1647 int payload_len, mldlen; 1648 struct inet6_dev *idev; 1649 struct net *net = dev_net(skb->dev); 1650 int err; 1651 struct flowi6 fl6; 1652 struct dst_entry *dst; 1653 1654 rcu_read_lock(); 1655 idev = __in6_dev_get(skb->dev); 1656 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1657 1658 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1659 sizeof(*pip6); 1660 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1661 pip6->payload_len = htons(payload_len); 1662 1663 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1664 IPPROTO_ICMPV6, 1665 csum_partial(skb_transport_header(skb), 1666 mldlen, 0)); 1667 1668 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1669 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1670 skb->dev->ifindex); 1671 dst = icmp6_dst_alloc(skb->dev, &fl6); 1672 1673 err = 0; 1674 if (IS_ERR(dst)) { 1675 err = PTR_ERR(dst); 1676 dst = NULL; 1677 } 1678 skb_dst_set(skb, dst); 1679 if (err) 1680 goto err_out; 1681 1682 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1683 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1684 dst_output); 1685 out: 1686 if (!err) { 1687 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1688 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1689 } else { 1690 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1691 } 1692 1693 rcu_read_unlock(); 1694 return; 1695 1696 err_out: 1697 kfree_skb(skb); 1698 goto out; 1699 } 1700 1701 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1702 { 1703 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1704 } 1705 1706 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1707 int type, struct mld2_grec **ppgr, unsigned int mtu) 1708 { 1709 struct mld2_report *pmr; 1710 struct mld2_grec *pgr; 1711 1712 if (!skb) { 1713 skb = mld_newpack(pmc->idev, mtu); 1714 if (!skb) 1715 return NULL; 1716 } 1717 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1718 pgr->grec_type = type; 1719 pgr->grec_auxwords = 0; 1720 pgr->grec_nsrcs = 0; 1721 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1722 pmr = (struct mld2_report *)skb_transport_header(skb); 1723 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1724 *ppgr = pgr; 1725 return skb; 1726 } 1727 1728 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1729 1730 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1731 int type, int gdeleted, int sdeleted, int crsend) 1732 { 1733 struct inet6_dev *idev = pmc->idev; 1734 struct net_device *dev = idev->dev; 1735 struct mld2_report *pmr; 1736 struct mld2_grec *pgr = NULL; 1737 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1738 int scount, stotal, first, isquery, truncate; 1739 unsigned int mtu; 1740 1741 if (pmc->mca_flags & MAF_NOREPORT) 1742 return skb; 1743 1744 mtu = READ_ONCE(dev->mtu); 1745 if (mtu < IPV6_MIN_MTU) 1746 return skb; 1747 1748 isquery = type == MLD2_MODE_IS_INCLUDE || 1749 type == MLD2_MODE_IS_EXCLUDE; 1750 truncate = type == MLD2_MODE_IS_EXCLUDE || 1751 type == MLD2_CHANGE_TO_EXCLUDE; 1752 1753 stotal = scount = 0; 1754 1755 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1756 1757 if (!*psf_list) 1758 goto empty_source; 1759 1760 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1761 1762 /* EX and TO_EX get a fresh packet, if needed */ 1763 if (truncate) { 1764 if (pmr && pmr->mld2r_ngrec && 1765 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1766 if (skb) 1767 mld_sendpack(skb); 1768 skb = mld_newpack(idev, mtu); 1769 } 1770 } 1771 first = 1; 1772 psf_prev = NULL; 1773 for (psf = *psf_list; psf; psf = psf_next) { 1774 struct in6_addr *psrc; 1775 1776 psf_next = psf->sf_next; 1777 1778 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1779 psf_prev = psf; 1780 continue; 1781 } 1782 1783 /* Based on RFC3810 6.1. Should not send source-list change 1784 * records when there is a filter mode change. 1785 */ 1786 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1787 (!gdeleted && pmc->mca_crcount)) && 1788 (type == MLD2_ALLOW_NEW_SOURCES || 1789 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1790 goto decrease_sf_crcount; 1791 1792 /* clear marks on query responses */ 1793 if (isquery) 1794 psf->sf_gsresp = 0; 1795 1796 if (AVAILABLE(skb) < sizeof(*psrc) + 1797 first*sizeof(struct mld2_grec)) { 1798 if (truncate && !first) 1799 break; /* truncate these */ 1800 if (pgr) 1801 pgr->grec_nsrcs = htons(scount); 1802 if (skb) 1803 mld_sendpack(skb); 1804 skb = mld_newpack(idev, mtu); 1805 first = 1; 1806 scount = 0; 1807 } 1808 if (first) { 1809 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1810 first = 0; 1811 } 1812 if (!skb) 1813 return NULL; 1814 psrc = skb_put(skb, sizeof(*psrc)); 1815 *psrc = psf->sf_addr; 1816 scount++; stotal++; 1817 if ((type == MLD2_ALLOW_NEW_SOURCES || 1818 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1819 decrease_sf_crcount: 1820 psf->sf_crcount--; 1821 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1822 if (psf_prev) 1823 psf_prev->sf_next = psf->sf_next; 1824 else 1825 *psf_list = psf->sf_next; 1826 kfree(psf); 1827 continue; 1828 } 1829 } 1830 psf_prev = psf; 1831 } 1832 1833 empty_source: 1834 if (!stotal) { 1835 if (type == MLD2_ALLOW_NEW_SOURCES || 1836 type == MLD2_BLOCK_OLD_SOURCES) 1837 return skb; 1838 if (pmc->mca_crcount || isquery || crsend) { 1839 /* make sure we have room for group header */ 1840 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1841 mld_sendpack(skb); 1842 skb = NULL; /* add_grhead will get a new one */ 1843 } 1844 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1845 } 1846 } 1847 if (pgr) 1848 pgr->grec_nsrcs = htons(scount); 1849 1850 if (isquery) 1851 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1852 return skb; 1853 } 1854 1855 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1856 { 1857 struct sk_buff *skb = NULL; 1858 int type; 1859 1860 read_lock_bh(&idev->lock); 1861 if (!pmc) { 1862 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1863 if (pmc->mca_flags & MAF_NOREPORT) 1864 continue; 1865 spin_lock_bh(&pmc->mca_lock); 1866 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1867 type = MLD2_MODE_IS_EXCLUDE; 1868 else 1869 type = MLD2_MODE_IS_INCLUDE; 1870 skb = add_grec(skb, pmc, type, 0, 0, 0); 1871 spin_unlock_bh(&pmc->mca_lock); 1872 } 1873 } else { 1874 spin_lock_bh(&pmc->mca_lock); 1875 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1876 type = MLD2_MODE_IS_EXCLUDE; 1877 else 1878 type = MLD2_MODE_IS_INCLUDE; 1879 skb = add_grec(skb, pmc, type, 0, 0, 0); 1880 spin_unlock_bh(&pmc->mca_lock); 1881 } 1882 read_unlock_bh(&idev->lock); 1883 if (skb) 1884 mld_sendpack(skb); 1885 } 1886 1887 /* 1888 * remove zero-count source records from a source filter list 1889 */ 1890 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1891 { 1892 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1893 1894 psf_prev = NULL; 1895 for (psf = *ppsf; psf; psf = psf_next) { 1896 psf_next = psf->sf_next; 1897 if (psf->sf_crcount == 0) { 1898 if (psf_prev) 1899 psf_prev->sf_next = psf->sf_next; 1900 else 1901 *ppsf = psf->sf_next; 1902 kfree(psf); 1903 } else 1904 psf_prev = psf; 1905 } 1906 } 1907 1908 static void mld_send_cr(struct inet6_dev *idev) 1909 { 1910 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1911 struct sk_buff *skb = NULL; 1912 int type, dtype; 1913 1914 read_lock_bh(&idev->lock); 1915 spin_lock(&idev->mc_lock); 1916 1917 /* deleted MCA's */ 1918 pmc_prev = NULL; 1919 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) { 1920 pmc_next = pmc->next; 1921 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1922 type = MLD2_BLOCK_OLD_SOURCES; 1923 dtype = MLD2_BLOCK_OLD_SOURCES; 1924 skb = add_grec(skb, pmc, type, 1, 0, 0); 1925 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 1926 } 1927 if (pmc->mca_crcount) { 1928 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1929 type = MLD2_CHANGE_TO_INCLUDE; 1930 skb = add_grec(skb, pmc, type, 1, 0, 0); 1931 } 1932 pmc->mca_crcount--; 1933 if (pmc->mca_crcount == 0) { 1934 mld_clear_zeros(&pmc->mca_tomb); 1935 mld_clear_zeros(&pmc->mca_sources); 1936 } 1937 } 1938 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1939 !pmc->mca_sources) { 1940 if (pmc_prev) 1941 pmc_prev->next = pmc_next; 1942 else 1943 idev->mc_tomb = pmc_next; 1944 in6_dev_put(pmc->idev); 1945 kfree(pmc); 1946 } else 1947 pmc_prev = pmc; 1948 } 1949 spin_unlock(&idev->mc_lock); 1950 1951 /* change recs */ 1952 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 1953 spin_lock_bh(&pmc->mca_lock); 1954 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1955 type = MLD2_BLOCK_OLD_SOURCES; 1956 dtype = MLD2_ALLOW_NEW_SOURCES; 1957 } else { 1958 type = MLD2_ALLOW_NEW_SOURCES; 1959 dtype = MLD2_BLOCK_OLD_SOURCES; 1960 } 1961 skb = add_grec(skb, pmc, type, 0, 0, 0); 1962 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 1963 1964 /* filter mode changes */ 1965 if (pmc->mca_crcount) { 1966 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1967 type = MLD2_CHANGE_TO_EXCLUDE; 1968 else 1969 type = MLD2_CHANGE_TO_INCLUDE; 1970 skb = add_grec(skb, pmc, type, 0, 0, 0); 1971 pmc->mca_crcount--; 1972 } 1973 spin_unlock_bh(&pmc->mca_lock); 1974 } 1975 read_unlock_bh(&idev->lock); 1976 if (!skb) 1977 return; 1978 (void) mld_sendpack(skb); 1979 } 1980 1981 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1982 { 1983 struct net *net = dev_net(dev); 1984 struct sock *sk = net->ipv6.igmp_sk; 1985 struct inet6_dev *idev; 1986 struct sk_buff *skb; 1987 struct mld_msg *hdr; 1988 const struct in6_addr *snd_addr, *saddr; 1989 struct in6_addr addr_buf; 1990 int hlen = LL_RESERVED_SPACE(dev); 1991 int tlen = dev->needed_tailroom; 1992 int err, len, payload_len, full_len; 1993 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1994 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1995 IPV6_TLV_PADN, 0 }; 1996 struct flowi6 fl6; 1997 struct dst_entry *dst; 1998 1999 if (type == ICMPV6_MGM_REDUCTION) 2000 snd_addr = &in6addr_linklocal_allrouters; 2001 else 2002 snd_addr = addr; 2003 2004 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2005 payload_len = len + sizeof(ra); 2006 full_len = sizeof(struct ipv6hdr) + payload_len; 2007 2008 rcu_read_lock(); 2009 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 2010 IPSTATS_MIB_OUT, full_len); 2011 rcu_read_unlock(); 2012 2013 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2014 2015 if (!skb) { 2016 rcu_read_lock(); 2017 IP6_INC_STATS(net, __in6_dev_get(dev), 2018 IPSTATS_MIB_OUTDISCARDS); 2019 rcu_read_unlock(); 2020 return; 2021 } 2022 skb->priority = TC_PRIO_CONTROL; 2023 skb_reserve(skb, hlen); 2024 2025 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2026 /* <draft-ietf-magma-mld-source-05.txt>: 2027 * use unspecified address as the source address 2028 * when a valid link-local address is not available. 2029 */ 2030 saddr = &in6addr_any; 2031 } else 2032 saddr = &addr_buf; 2033 2034 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2035 2036 skb_put_data(skb, ra, sizeof(ra)); 2037 2038 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2039 hdr->mld_type = type; 2040 hdr->mld_mca = *addr; 2041 2042 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2043 IPPROTO_ICMPV6, 2044 csum_partial(hdr, len, 0)); 2045 2046 rcu_read_lock(); 2047 idev = __in6_dev_get(skb->dev); 2048 2049 icmpv6_flow_init(sk, &fl6, type, 2050 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2051 skb->dev->ifindex); 2052 dst = icmp6_dst_alloc(skb->dev, &fl6); 2053 if (IS_ERR(dst)) { 2054 err = PTR_ERR(dst); 2055 goto err_out; 2056 } 2057 2058 skb_dst_set(skb, dst); 2059 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2060 net, sk, skb, NULL, skb->dev, 2061 dst_output); 2062 out: 2063 if (!err) { 2064 ICMP6MSGOUT_INC_STATS(net, idev, type); 2065 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2066 } else 2067 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2068 2069 rcu_read_unlock(); 2070 return; 2071 2072 err_out: 2073 kfree_skb(skb); 2074 goto out; 2075 } 2076 2077 static void mld_send_initial_cr(struct inet6_dev *idev) 2078 { 2079 struct sk_buff *skb; 2080 struct ifmcaddr6 *pmc; 2081 int type; 2082 2083 if (mld_in_v1_mode(idev)) 2084 return; 2085 2086 skb = NULL; 2087 read_lock_bh(&idev->lock); 2088 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2089 spin_lock_bh(&pmc->mca_lock); 2090 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2091 type = MLD2_CHANGE_TO_EXCLUDE; 2092 else 2093 type = MLD2_ALLOW_NEW_SOURCES; 2094 skb = add_grec(skb, pmc, type, 0, 0, 1); 2095 spin_unlock_bh(&pmc->mca_lock); 2096 } 2097 read_unlock_bh(&idev->lock); 2098 if (skb) 2099 mld_sendpack(skb); 2100 } 2101 2102 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2103 { 2104 idev->mc_dad_count = idev->mc_qrv; 2105 if (idev->mc_dad_count) { 2106 mld_send_initial_cr(idev); 2107 idev->mc_dad_count--; 2108 if (idev->mc_dad_count) 2109 mld_dad_start_timer(idev, 2110 unsolicited_report_interval(idev)); 2111 } 2112 } 2113 2114 static void mld_dad_timer_expire(struct timer_list *t) 2115 { 2116 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer); 2117 2118 mld_send_initial_cr(idev); 2119 if (idev->mc_dad_count) { 2120 idev->mc_dad_count--; 2121 if (idev->mc_dad_count) 2122 mld_dad_start_timer(idev, 2123 unsolicited_report_interval(idev)); 2124 } 2125 in6_dev_put(idev); 2126 } 2127 2128 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2129 const struct in6_addr *psfsrc) 2130 { 2131 struct ip6_sf_list *psf, *psf_prev; 2132 int rv = 0; 2133 2134 psf_prev = NULL; 2135 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2136 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2137 break; 2138 psf_prev = psf; 2139 } 2140 if (!psf || psf->sf_count[sfmode] == 0) { 2141 /* source filter not found, or count wrong => bug */ 2142 return -ESRCH; 2143 } 2144 psf->sf_count[sfmode]--; 2145 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2146 struct inet6_dev *idev = pmc->idev; 2147 2148 /* no more filters for this source */ 2149 if (psf_prev) 2150 psf_prev->sf_next = psf->sf_next; 2151 else 2152 pmc->mca_sources = psf->sf_next; 2153 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2154 !mld_in_v1_mode(idev)) { 2155 psf->sf_crcount = idev->mc_qrv; 2156 psf->sf_next = pmc->mca_tomb; 2157 pmc->mca_tomb = psf; 2158 rv = 1; 2159 } else 2160 kfree(psf); 2161 } 2162 return rv; 2163 } 2164 2165 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2166 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2167 int delta) 2168 { 2169 struct ifmcaddr6 *pmc; 2170 int changerec = 0; 2171 int i, err; 2172 2173 if (!idev) 2174 return -ENODEV; 2175 read_lock_bh(&idev->lock); 2176 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2177 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2178 break; 2179 } 2180 if (!pmc) { 2181 /* MCA not found?? bug */ 2182 read_unlock_bh(&idev->lock); 2183 return -ESRCH; 2184 } 2185 spin_lock_bh(&pmc->mca_lock); 2186 sf_markstate(pmc); 2187 if (!delta) { 2188 if (!pmc->mca_sfcount[sfmode]) { 2189 spin_unlock_bh(&pmc->mca_lock); 2190 read_unlock_bh(&idev->lock); 2191 return -EINVAL; 2192 } 2193 pmc->mca_sfcount[sfmode]--; 2194 } 2195 err = 0; 2196 for (i = 0; i < sfcount; i++) { 2197 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2198 2199 changerec |= rv > 0; 2200 if (!err && rv < 0) 2201 err = rv; 2202 } 2203 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2204 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2205 pmc->mca_sfcount[MCAST_INCLUDE]) { 2206 struct ip6_sf_list *psf; 2207 2208 /* filter mode change */ 2209 pmc->mca_sfmode = MCAST_INCLUDE; 2210 pmc->mca_crcount = idev->mc_qrv; 2211 idev->mc_ifc_count = pmc->mca_crcount; 2212 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2213 psf->sf_crcount = 0; 2214 mld_ifc_event(pmc->idev); 2215 } else if (sf_setstate(pmc) || changerec) 2216 mld_ifc_event(pmc->idev); 2217 spin_unlock_bh(&pmc->mca_lock); 2218 read_unlock_bh(&idev->lock); 2219 return err; 2220 } 2221 2222 /* 2223 * Add multicast single-source filter to the interface list 2224 */ 2225 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2226 const struct in6_addr *psfsrc) 2227 { 2228 struct ip6_sf_list *psf, *psf_prev; 2229 2230 psf_prev = NULL; 2231 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2232 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2233 break; 2234 psf_prev = psf; 2235 } 2236 if (!psf) { 2237 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 2238 if (!psf) 2239 return -ENOBUFS; 2240 2241 psf->sf_addr = *psfsrc; 2242 if (psf_prev) { 2243 psf_prev->sf_next = psf; 2244 } else 2245 pmc->mca_sources = psf; 2246 } 2247 psf->sf_count[sfmode]++; 2248 return 0; 2249 } 2250 2251 static void sf_markstate(struct ifmcaddr6 *pmc) 2252 { 2253 struct ip6_sf_list *psf; 2254 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2255 2256 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2257 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2258 psf->sf_oldin = mca_xcount == 2259 psf->sf_count[MCAST_EXCLUDE] && 2260 !psf->sf_count[MCAST_INCLUDE]; 2261 } else 2262 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2263 } 2264 2265 static int sf_setstate(struct ifmcaddr6 *pmc) 2266 { 2267 struct ip6_sf_list *psf, *dpsf; 2268 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2269 int qrv = pmc->idev->mc_qrv; 2270 int new_in, rv; 2271 2272 rv = 0; 2273 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { 2274 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2275 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2276 !psf->sf_count[MCAST_INCLUDE]; 2277 } else 2278 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2279 if (new_in) { 2280 if (!psf->sf_oldin) { 2281 struct ip6_sf_list *prev = NULL; 2282 2283 for (dpsf = pmc->mca_tomb; dpsf; 2284 dpsf = dpsf->sf_next) { 2285 if (ipv6_addr_equal(&dpsf->sf_addr, 2286 &psf->sf_addr)) 2287 break; 2288 prev = dpsf; 2289 } 2290 if (dpsf) { 2291 if (prev) 2292 prev->sf_next = dpsf->sf_next; 2293 else 2294 pmc->mca_tomb = dpsf->sf_next; 2295 kfree(dpsf); 2296 } 2297 psf->sf_crcount = qrv; 2298 rv++; 2299 } 2300 } else if (psf->sf_oldin) { 2301 psf->sf_crcount = 0; 2302 /* 2303 * add or update "delete" records if an active filter 2304 * is now inactive 2305 */ 2306 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next) 2307 if (ipv6_addr_equal(&dpsf->sf_addr, 2308 &psf->sf_addr)) 2309 break; 2310 if (!dpsf) { 2311 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2312 if (!dpsf) 2313 continue; 2314 *dpsf = *psf; 2315 /* pmc->mca_lock held by callers */ 2316 dpsf->sf_next = pmc->mca_tomb; 2317 pmc->mca_tomb = dpsf; 2318 } 2319 dpsf->sf_crcount = qrv; 2320 rv++; 2321 } 2322 } 2323 return rv; 2324 } 2325 2326 /* 2327 * Add multicast source filter list to the interface list 2328 */ 2329 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2330 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2331 int delta) 2332 { 2333 struct ifmcaddr6 *pmc; 2334 int isexclude; 2335 int i, err; 2336 2337 if (!idev) 2338 return -ENODEV; 2339 read_lock_bh(&idev->lock); 2340 for (pmc = idev->mc_list; pmc; pmc = pmc->next) { 2341 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2342 break; 2343 } 2344 if (!pmc) { 2345 /* MCA not found?? bug */ 2346 read_unlock_bh(&idev->lock); 2347 return -ESRCH; 2348 } 2349 spin_lock_bh(&pmc->mca_lock); 2350 2351 sf_markstate(pmc); 2352 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2353 if (!delta) 2354 pmc->mca_sfcount[sfmode]++; 2355 err = 0; 2356 for (i = 0; i < sfcount; i++) { 2357 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2358 if (err) 2359 break; 2360 } 2361 if (err) { 2362 int j; 2363 2364 if (!delta) 2365 pmc->mca_sfcount[sfmode]--; 2366 for (j = 0; j < i; j++) 2367 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2368 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2369 struct ip6_sf_list *psf; 2370 2371 /* filter mode change */ 2372 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2373 pmc->mca_sfmode = MCAST_EXCLUDE; 2374 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2375 pmc->mca_sfmode = MCAST_INCLUDE; 2376 /* else no filters; keep old mode for reports */ 2377 2378 pmc->mca_crcount = idev->mc_qrv; 2379 idev->mc_ifc_count = pmc->mca_crcount; 2380 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) 2381 psf->sf_crcount = 0; 2382 mld_ifc_event(idev); 2383 } else if (sf_setstate(pmc)) 2384 mld_ifc_event(idev); 2385 spin_unlock_bh(&pmc->mca_lock); 2386 read_unlock_bh(&idev->lock); 2387 return err; 2388 } 2389 2390 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2391 { 2392 struct ip6_sf_list *psf, *nextpsf; 2393 2394 for (psf = pmc->mca_tomb; psf; psf = nextpsf) { 2395 nextpsf = psf->sf_next; 2396 kfree(psf); 2397 } 2398 pmc->mca_tomb = NULL; 2399 for (psf = pmc->mca_sources; psf; psf = nextpsf) { 2400 nextpsf = psf->sf_next; 2401 kfree(psf); 2402 } 2403 pmc->mca_sources = NULL; 2404 pmc->mca_sfmode = MCAST_EXCLUDE; 2405 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2406 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2407 } 2408 2409 2410 static void igmp6_join_group(struct ifmcaddr6 *ma) 2411 { 2412 unsigned long delay; 2413 2414 if (ma->mca_flags & MAF_NOREPORT) 2415 return; 2416 2417 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2418 2419 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2420 2421 spin_lock_bh(&ma->mca_lock); 2422 if (del_timer(&ma->mca_timer)) { 2423 refcount_dec(&ma->mca_refcnt); 2424 delay = ma->mca_timer.expires - jiffies; 2425 } 2426 2427 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2428 refcount_inc(&ma->mca_refcnt); 2429 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2430 spin_unlock_bh(&ma->mca_lock); 2431 } 2432 2433 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2434 struct inet6_dev *idev) 2435 { 2436 int err; 2437 2438 write_lock_bh(&iml->sflock); 2439 if (!iml->sflist) { 2440 /* any-source empty exclude case */ 2441 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2442 } else { 2443 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2444 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2445 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2446 iml->sflist = NULL; 2447 } 2448 write_unlock_bh(&iml->sflock); 2449 return err; 2450 } 2451 2452 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2453 { 2454 if (mld_in_v1_mode(ma->idev)) { 2455 if (ma->mca_flags & MAF_LAST_REPORTER) 2456 igmp6_send(&ma->mca_addr, ma->idev->dev, 2457 ICMPV6_MGM_REDUCTION); 2458 } else { 2459 mld_add_delrec(ma->idev, ma); 2460 mld_ifc_event(ma->idev); 2461 } 2462 } 2463 2464 static void mld_gq_timer_expire(struct timer_list *t) 2465 { 2466 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer); 2467 2468 idev->mc_gq_running = 0; 2469 mld_send_report(idev, NULL); 2470 in6_dev_put(idev); 2471 } 2472 2473 static void mld_ifc_timer_expire(struct timer_list *t) 2474 { 2475 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer); 2476 2477 mld_send_cr(idev); 2478 if (idev->mc_ifc_count) { 2479 idev->mc_ifc_count--; 2480 if (idev->mc_ifc_count) 2481 mld_ifc_start_timer(idev, 2482 unsolicited_report_interval(idev)); 2483 } 2484 in6_dev_put(idev); 2485 } 2486 2487 static void mld_ifc_event(struct inet6_dev *idev) 2488 { 2489 if (mld_in_v1_mode(idev)) 2490 return; 2491 idev->mc_ifc_count = idev->mc_qrv; 2492 mld_ifc_start_timer(idev, 1); 2493 } 2494 2495 static void igmp6_timer_handler(struct timer_list *t) 2496 { 2497 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer); 2498 2499 if (mld_in_v1_mode(ma->idev)) 2500 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2501 else 2502 mld_send_report(ma->idev, ma); 2503 2504 spin_lock(&ma->mca_lock); 2505 ma->mca_flags |= MAF_LAST_REPORTER; 2506 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2507 spin_unlock(&ma->mca_lock); 2508 ma_put(ma); 2509 } 2510 2511 /* Device changing type */ 2512 2513 void ipv6_mc_unmap(struct inet6_dev *idev) 2514 { 2515 struct ifmcaddr6 *i; 2516 2517 /* Install multicast list, except for all-nodes (already installed) */ 2518 2519 read_lock_bh(&idev->lock); 2520 for (i = idev->mc_list; i; i = i->next) 2521 igmp6_group_dropped(i); 2522 read_unlock_bh(&idev->lock); 2523 } 2524 2525 void ipv6_mc_remap(struct inet6_dev *idev) 2526 { 2527 ipv6_mc_up(idev); 2528 } 2529 2530 /* Device going down */ 2531 2532 void ipv6_mc_down(struct inet6_dev *idev) 2533 { 2534 struct ifmcaddr6 *i; 2535 2536 /* Withdraw multicast list */ 2537 2538 read_lock_bh(&idev->lock); 2539 2540 for (i = idev->mc_list; i; i = i->next) 2541 igmp6_group_dropped(i); 2542 2543 /* Should stop timer after group drop. or we will 2544 * start timer again in mld_ifc_event() 2545 */ 2546 mld_ifc_stop_timer(idev); 2547 mld_gq_stop_timer(idev); 2548 mld_dad_stop_timer(idev); 2549 read_unlock_bh(&idev->lock); 2550 } 2551 2552 static void ipv6_mc_reset(struct inet6_dev *idev) 2553 { 2554 idev->mc_qrv = sysctl_mld_qrv; 2555 idev->mc_qi = MLD_QI_DEFAULT; 2556 idev->mc_qri = MLD_QRI_DEFAULT; 2557 idev->mc_v1_seen = 0; 2558 idev->mc_maxdelay = unsolicited_report_interval(idev); 2559 } 2560 2561 /* Device going up */ 2562 2563 void ipv6_mc_up(struct inet6_dev *idev) 2564 { 2565 struct ifmcaddr6 *i; 2566 2567 /* Install multicast list, except for all-nodes (already installed) */ 2568 2569 read_lock_bh(&idev->lock); 2570 ipv6_mc_reset(idev); 2571 for (i = idev->mc_list; i; i = i->next) { 2572 mld_del_delrec(idev, i); 2573 igmp6_group_added(i); 2574 } 2575 read_unlock_bh(&idev->lock); 2576 } 2577 2578 /* IPv6 device initialization. */ 2579 2580 void ipv6_mc_init_dev(struct inet6_dev *idev) 2581 { 2582 write_lock_bh(&idev->lock); 2583 spin_lock_init(&idev->mc_lock); 2584 idev->mc_gq_running = 0; 2585 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0); 2586 idev->mc_tomb = NULL; 2587 idev->mc_ifc_count = 0; 2588 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0); 2589 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0); 2590 ipv6_mc_reset(idev); 2591 write_unlock_bh(&idev->lock); 2592 } 2593 2594 /* 2595 * Device is about to be destroyed: clean up. 2596 */ 2597 2598 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2599 { 2600 struct ifmcaddr6 *i; 2601 2602 /* Deactivate timers */ 2603 ipv6_mc_down(idev); 2604 mld_clear_delrec(idev); 2605 2606 /* Delete all-nodes address. */ 2607 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2608 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2609 * fail. 2610 */ 2611 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2612 2613 if (idev->cnf.forwarding) 2614 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2615 2616 write_lock_bh(&idev->lock); 2617 while ((i = idev->mc_list) != NULL) { 2618 idev->mc_list = i->next; 2619 2620 write_unlock_bh(&idev->lock); 2621 ma_put(i); 2622 write_lock_bh(&idev->lock); 2623 } 2624 write_unlock_bh(&idev->lock); 2625 } 2626 2627 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2628 { 2629 struct ifmcaddr6 *pmc; 2630 2631 ASSERT_RTNL(); 2632 2633 if (mld_in_v1_mode(idev)) { 2634 read_lock_bh(&idev->lock); 2635 for (pmc = idev->mc_list; pmc; pmc = pmc->next) 2636 igmp6_join_group(pmc); 2637 read_unlock_bh(&idev->lock); 2638 } else 2639 mld_send_report(idev, NULL); 2640 } 2641 2642 static int ipv6_mc_netdev_event(struct notifier_block *this, 2643 unsigned long event, 2644 void *ptr) 2645 { 2646 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2647 struct inet6_dev *idev = __in6_dev_get(dev); 2648 2649 switch (event) { 2650 case NETDEV_RESEND_IGMP: 2651 if (idev) 2652 ipv6_mc_rejoin_groups(idev); 2653 break; 2654 default: 2655 break; 2656 } 2657 2658 return NOTIFY_DONE; 2659 } 2660 2661 static struct notifier_block igmp6_netdev_notifier = { 2662 .notifier_call = ipv6_mc_netdev_event, 2663 }; 2664 2665 #ifdef CONFIG_PROC_FS 2666 struct igmp6_mc_iter_state { 2667 struct seq_net_private p; 2668 struct net_device *dev; 2669 struct inet6_dev *idev; 2670 }; 2671 2672 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2673 2674 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2675 { 2676 struct ifmcaddr6 *im = NULL; 2677 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2678 struct net *net = seq_file_net(seq); 2679 2680 state->idev = NULL; 2681 for_each_netdev_rcu(net, state->dev) { 2682 struct inet6_dev *idev; 2683 idev = __in6_dev_get(state->dev); 2684 if (!idev) 2685 continue; 2686 read_lock_bh(&idev->lock); 2687 im = idev->mc_list; 2688 if (im) { 2689 state->idev = idev; 2690 break; 2691 } 2692 read_unlock_bh(&idev->lock); 2693 } 2694 return im; 2695 } 2696 2697 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2698 { 2699 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2700 2701 im = im->next; 2702 while (!im) { 2703 if (likely(state->idev)) 2704 read_unlock_bh(&state->idev->lock); 2705 2706 state->dev = next_net_device_rcu(state->dev); 2707 if (!state->dev) { 2708 state->idev = NULL; 2709 break; 2710 } 2711 state->idev = __in6_dev_get(state->dev); 2712 if (!state->idev) 2713 continue; 2714 read_lock_bh(&state->idev->lock); 2715 im = state->idev->mc_list; 2716 } 2717 return im; 2718 } 2719 2720 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2721 { 2722 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2723 if (im) 2724 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2725 --pos; 2726 return pos ? NULL : im; 2727 } 2728 2729 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2730 __acquires(RCU) 2731 { 2732 rcu_read_lock(); 2733 return igmp6_mc_get_idx(seq, *pos); 2734 } 2735 2736 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2737 { 2738 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2739 2740 ++*pos; 2741 return im; 2742 } 2743 2744 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2745 __releases(RCU) 2746 { 2747 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2748 2749 if (likely(state->idev)) { 2750 read_unlock_bh(&state->idev->lock); 2751 state->idev = NULL; 2752 } 2753 state->dev = NULL; 2754 rcu_read_unlock(); 2755 } 2756 2757 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2758 { 2759 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2760 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2761 2762 seq_printf(seq, 2763 "%-4d %-15s %pi6 %5d %08X %ld\n", 2764 state->dev->ifindex, state->dev->name, 2765 &im->mca_addr, 2766 im->mca_users, im->mca_flags, 2767 (im->mca_flags&MAF_TIMER_RUNNING) ? 2768 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2769 return 0; 2770 } 2771 2772 static const struct seq_operations igmp6_mc_seq_ops = { 2773 .start = igmp6_mc_seq_start, 2774 .next = igmp6_mc_seq_next, 2775 .stop = igmp6_mc_seq_stop, 2776 .show = igmp6_mc_seq_show, 2777 }; 2778 2779 struct igmp6_mcf_iter_state { 2780 struct seq_net_private p; 2781 struct net_device *dev; 2782 struct inet6_dev *idev; 2783 struct ifmcaddr6 *im; 2784 }; 2785 2786 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2787 2788 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2789 { 2790 struct ip6_sf_list *psf = NULL; 2791 struct ifmcaddr6 *im = NULL; 2792 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2793 struct net *net = seq_file_net(seq); 2794 2795 state->idev = NULL; 2796 state->im = NULL; 2797 for_each_netdev_rcu(net, state->dev) { 2798 struct inet6_dev *idev; 2799 idev = __in6_dev_get(state->dev); 2800 if (unlikely(idev == NULL)) 2801 continue; 2802 read_lock_bh(&idev->lock); 2803 im = idev->mc_list; 2804 if (likely(im)) { 2805 spin_lock_bh(&im->mca_lock); 2806 psf = im->mca_sources; 2807 if (likely(psf)) { 2808 state->im = im; 2809 state->idev = idev; 2810 break; 2811 } 2812 spin_unlock_bh(&im->mca_lock); 2813 } 2814 read_unlock_bh(&idev->lock); 2815 } 2816 return psf; 2817 } 2818 2819 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2820 { 2821 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2822 2823 psf = psf->sf_next; 2824 while (!psf) { 2825 spin_unlock_bh(&state->im->mca_lock); 2826 state->im = state->im->next; 2827 while (!state->im) { 2828 if (likely(state->idev)) 2829 read_unlock_bh(&state->idev->lock); 2830 2831 state->dev = next_net_device_rcu(state->dev); 2832 if (!state->dev) { 2833 state->idev = NULL; 2834 goto out; 2835 } 2836 state->idev = __in6_dev_get(state->dev); 2837 if (!state->idev) 2838 continue; 2839 read_lock_bh(&state->idev->lock); 2840 state->im = state->idev->mc_list; 2841 } 2842 if (!state->im) 2843 break; 2844 spin_lock_bh(&state->im->mca_lock); 2845 psf = state->im->mca_sources; 2846 } 2847 out: 2848 return psf; 2849 } 2850 2851 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2852 { 2853 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2854 if (psf) 2855 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2856 --pos; 2857 return pos ? NULL : psf; 2858 } 2859 2860 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2861 __acquires(RCU) 2862 { 2863 rcu_read_lock(); 2864 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2865 } 2866 2867 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2868 { 2869 struct ip6_sf_list *psf; 2870 if (v == SEQ_START_TOKEN) 2871 psf = igmp6_mcf_get_first(seq); 2872 else 2873 psf = igmp6_mcf_get_next(seq, v); 2874 ++*pos; 2875 return psf; 2876 } 2877 2878 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2879 __releases(RCU) 2880 { 2881 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2882 if (likely(state->im)) { 2883 spin_unlock_bh(&state->im->mca_lock); 2884 state->im = NULL; 2885 } 2886 if (likely(state->idev)) { 2887 read_unlock_bh(&state->idev->lock); 2888 state->idev = NULL; 2889 } 2890 state->dev = NULL; 2891 rcu_read_unlock(); 2892 } 2893 2894 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2895 { 2896 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2897 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2898 2899 if (v == SEQ_START_TOKEN) { 2900 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 2901 } else { 2902 seq_printf(seq, 2903 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2904 state->dev->ifindex, state->dev->name, 2905 &state->im->mca_addr, 2906 &psf->sf_addr, 2907 psf->sf_count[MCAST_INCLUDE], 2908 psf->sf_count[MCAST_EXCLUDE]); 2909 } 2910 return 0; 2911 } 2912 2913 static const struct seq_operations igmp6_mcf_seq_ops = { 2914 .start = igmp6_mcf_seq_start, 2915 .next = igmp6_mcf_seq_next, 2916 .stop = igmp6_mcf_seq_stop, 2917 .show = igmp6_mcf_seq_show, 2918 }; 2919 2920 static int __net_init igmp6_proc_init(struct net *net) 2921 { 2922 int err; 2923 2924 err = -ENOMEM; 2925 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 2926 sizeof(struct igmp6_mc_iter_state))) 2927 goto out; 2928 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 2929 &igmp6_mcf_seq_ops, 2930 sizeof(struct igmp6_mcf_iter_state))) 2931 goto out_proc_net_igmp6; 2932 2933 err = 0; 2934 out: 2935 return err; 2936 2937 out_proc_net_igmp6: 2938 remove_proc_entry("igmp6", net->proc_net); 2939 goto out; 2940 } 2941 2942 static void __net_exit igmp6_proc_exit(struct net *net) 2943 { 2944 remove_proc_entry("mcfilter6", net->proc_net); 2945 remove_proc_entry("igmp6", net->proc_net); 2946 } 2947 #else 2948 static inline int igmp6_proc_init(struct net *net) 2949 { 2950 return 0; 2951 } 2952 static inline void igmp6_proc_exit(struct net *net) 2953 { 2954 } 2955 #endif 2956 2957 static int __net_init igmp6_net_init(struct net *net) 2958 { 2959 int err; 2960 2961 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2962 SOCK_RAW, IPPROTO_ICMPV6, net); 2963 if (err < 0) { 2964 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2965 err); 2966 goto out; 2967 } 2968 2969 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2970 2971 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 2972 SOCK_RAW, IPPROTO_ICMPV6, net); 2973 if (err < 0) { 2974 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 2975 err); 2976 goto out_sock_create; 2977 } 2978 2979 err = igmp6_proc_init(net); 2980 if (err) 2981 goto out_sock_create_autojoin; 2982 2983 return 0; 2984 2985 out_sock_create_autojoin: 2986 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2987 out_sock_create: 2988 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2989 out: 2990 return err; 2991 } 2992 2993 static void __net_exit igmp6_net_exit(struct net *net) 2994 { 2995 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2996 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 2997 igmp6_proc_exit(net); 2998 } 2999 3000 static struct pernet_operations igmp6_net_ops = { 3001 .init = igmp6_net_init, 3002 .exit = igmp6_net_exit, 3003 }; 3004 3005 int __init igmp6_init(void) 3006 { 3007 return register_pernet_subsys(&igmp6_net_ops); 3008 } 3009 3010 int __init igmp6_late_init(void) 3011 { 3012 return register_netdevice_notifier(&igmp6_netdev_notifier); 3013 } 3014 3015 void igmp6_cleanup(void) 3016 { 3017 unregister_pernet_subsys(&igmp6_net_ops); 3018 } 3019 3020 void igmp6_late_cleanup(void) 3021 { 3022 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3023 } 3024