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