1 /* 2 * Multicast support for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 /* Changes: 17 * 18 * yoshfuji : fix format of router-alert option 19 * YOSHIFUJI Hideaki @USAGI: 20 * Fixed source address for MLD message based on 21 * <draft-ietf-magma-mld-source-05.txt>. 22 * YOSHIFUJI Hideaki @USAGI: 23 * - Ignore Queries for invalid addresses. 24 * - MLD for link-local addresses. 25 * David L Stevens <dlstevens@us.ibm.com>: 26 * - MLDv2 support 27 */ 28 29 #include <linux/module.h> 30 #include <linux/errno.h> 31 #include <linux/types.h> 32 #include <linux/string.h> 33 #include <linux/socket.h> 34 #include <linux/sockios.h> 35 #include <linux/jiffies.h> 36 #include <linux/times.h> 37 #include <linux/net.h> 38 #include <linux/in.h> 39 #include <linux/in6.h> 40 #include <linux/netdevice.h> 41 #include <linux/if_arp.h> 42 #include <linux/route.h> 43 #include <linux/init.h> 44 #include <linux/proc_fs.h> 45 #include <linux/seq_file.h> 46 #include <linux/slab.h> 47 #include <linux/pkt_sched.h> 48 #include <net/mld.h> 49 50 #include <linux/netfilter.h> 51 #include <linux/netfilter_ipv6.h> 52 53 #include <net/net_namespace.h> 54 #include <net/sock.h> 55 #include <net/snmp.h> 56 57 #include <net/ipv6.h> 58 #include <net/protocol.h> 59 #include <net/if_inet6.h> 60 #include <net/ndisc.h> 61 #include <net/addrconf.h> 62 #include <net/ip6_route.h> 63 #include <net/inet_common.h> 64 65 #include <net/ip6_checksum.h> 66 67 /* Set to 3 to get tracing... */ 68 #define MCAST_DEBUG 2 69 70 #if MCAST_DEBUG >= 3 71 #define MDBG(x) printk x 72 #else 73 #define MDBG(x) 74 #endif 75 76 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = { 78 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4), 79 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4), 80 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4) 81 }; 82 83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 84 85 /* Big mc list lock for all the sockets */ 86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock); 87 88 static void igmp6_join_group(struct ifmcaddr6 *ma); 89 static void igmp6_leave_group(struct ifmcaddr6 *ma); 90 static void igmp6_timer_handler(unsigned long data); 91 92 static void mld_gq_timer_expire(unsigned long data); 93 static void mld_ifc_timer_expire(unsigned long data); 94 static void mld_ifc_event(struct inet6_dev *idev); 95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr); 97 static void mld_clear_delrec(struct inet6_dev *idev); 98 static bool mld_in_v1_mode(const struct inet6_dev *idev); 99 static int sf_setstate(struct ifmcaddr6 *pmc); 100 static void sf_markstate(struct ifmcaddr6 *pmc); 101 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 102 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 103 int sfmode, int sfcount, const struct in6_addr *psfsrc, 104 int delta); 105 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 106 int sfmode, int sfcount, const struct in6_addr *psfsrc, 107 int delta); 108 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 109 struct inet6_dev *idev); 110 111 #define MLD_QRV_DEFAULT 2 112 /* RFC3810, 9.2. Query Interval */ 113 #define MLD_QI_DEFAULT (125 * HZ) 114 /* RFC3810, 9.3. Query Response Interval */ 115 #define MLD_QRI_DEFAULT (10 * HZ) 116 117 /* RFC3810, 8.1 Query Version Distinctions */ 118 #define MLD_V1_QUERY_LEN 24 119 #define MLD_V2_QUERY_LEN_MIN 28 120 121 #define IPV6_MLD_MAX_MSF 64 122 123 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 124 125 /* 126 * socket join on multicast group 127 */ 128 129 #define for_each_pmc_rcu(np, pmc) \ 130 for (pmc = rcu_dereference(np->ipv6_mc_list); \ 131 pmc != NULL; \ 132 pmc = rcu_dereference(pmc->next)) 133 134 static int unsolicited_report_interval(struct inet6_dev *idev) 135 { 136 int iv; 137 138 if (mld_in_v1_mode(idev)) 139 iv = idev->cnf.mldv1_unsolicited_report_interval; 140 else 141 iv = idev->cnf.mldv2_unsolicited_report_interval; 142 143 return iv > 0 ? iv : 1; 144 } 145 146 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 147 { 148 struct net_device *dev = NULL; 149 struct ipv6_mc_socklist *mc_lst; 150 struct ipv6_pinfo *np = inet6_sk(sk); 151 struct net *net = sock_net(sk); 152 int err; 153 154 if (!ipv6_addr_is_multicast(addr)) 155 return -EINVAL; 156 157 rcu_read_lock(); 158 for_each_pmc_rcu(np, mc_lst) { 159 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 160 ipv6_addr_equal(&mc_lst->addr, addr)) { 161 rcu_read_unlock(); 162 return -EADDRINUSE; 163 } 164 } 165 rcu_read_unlock(); 166 167 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 168 169 if (mc_lst == NULL) 170 return -ENOMEM; 171 172 mc_lst->next = NULL; 173 mc_lst->addr = *addr; 174 175 rtnl_lock(); 176 rcu_read_lock(); 177 if (ifindex == 0) { 178 struct rt6_info *rt; 179 rt = rt6_lookup(net, addr, NULL, 0, 0); 180 if (rt) { 181 dev = rt->dst.dev; 182 ip6_rt_put(rt); 183 } 184 } else 185 dev = dev_get_by_index_rcu(net, ifindex); 186 187 if (dev == NULL) { 188 rcu_read_unlock(); 189 rtnl_unlock(); 190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 191 return -ENODEV; 192 } 193 194 mc_lst->ifindex = dev->ifindex; 195 mc_lst->sfmode = MCAST_EXCLUDE; 196 rwlock_init(&mc_lst->sflock); 197 mc_lst->sflist = NULL; 198 199 /* 200 * now add/increase the group membership on the device 201 */ 202 203 err = ipv6_dev_mc_inc(dev, addr); 204 205 if (err) { 206 rcu_read_unlock(); 207 rtnl_unlock(); 208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 209 return err; 210 } 211 212 spin_lock(&ipv6_sk_mc_lock); 213 mc_lst->next = np->ipv6_mc_list; 214 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 215 spin_unlock(&ipv6_sk_mc_lock); 216 217 rcu_read_unlock(); 218 rtnl_unlock(); 219 220 return 0; 221 } 222 223 /* 224 * socket leave on multicast group 225 */ 226 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 227 { 228 struct ipv6_pinfo *np = inet6_sk(sk); 229 struct ipv6_mc_socklist *mc_lst; 230 struct ipv6_mc_socklist __rcu **lnk; 231 struct net *net = sock_net(sk); 232 233 if (!ipv6_addr_is_multicast(addr)) 234 return -EINVAL; 235 236 rtnl_lock(); 237 spin_lock(&ipv6_sk_mc_lock); 238 for (lnk = &np->ipv6_mc_list; 239 (mc_lst = rcu_dereference_protected(*lnk, 240 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ; 241 lnk = &mc_lst->next) { 242 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 243 ipv6_addr_equal(&mc_lst->addr, addr)) { 244 struct net_device *dev; 245 246 *lnk = mc_lst->next; 247 spin_unlock(&ipv6_sk_mc_lock); 248 249 rcu_read_lock(); 250 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 251 if (dev != NULL) { 252 struct inet6_dev *idev = __in6_dev_get(dev); 253 254 (void) ip6_mc_leave_src(sk, mc_lst, idev); 255 if (idev) 256 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 257 } else 258 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 259 rcu_read_unlock(); 260 rtnl_unlock(); 261 262 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 263 kfree_rcu(mc_lst, rcu); 264 return 0; 265 } 266 } 267 spin_unlock(&ipv6_sk_mc_lock); 268 rtnl_unlock(); 269 270 return -EADDRNOTAVAIL; 271 } 272 273 /* called with rcu_read_lock() */ 274 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 275 const struct in6_addr *group, 276 int ifindex) 277 { 278 struct net_device *dev = NULL; 279 struct inet6_dev *idev = NULL; 280 281 if (ifindex == 0) { 282 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); 283 284 if (rt) { 285 dev = rt->dst.dev; 286 ip6_rt_put(rt); 287 } 288 } else 289 dev = dev_get_by_index_rcu(net, ifindex); 290 291 if (!dev) 292 return NULL; 293 idev = __in6_dev_get(dev); 294 if (!idev) 295 return NULL; 296 read_lock_bh(&idev->lock); 297 if (idev->dead) { 298 read_unlock_bh(&idev->lock); 299 return NULL; 300 } 301 return idev; 302 } 303 304 void ipv6_sock_mc_close(struct sock *sk) 305 { 306 struct ipv6_pinfo *np = inet6_sk(sk); 307 struct ipv6_mc_socklist *mc_lst; 308 struct net *net = sock_net(sk); 309 310 if (!rcu_access_pointer(np->ipv6_mc_list)) 311 return; 312 313 rtnl_lock(); 314 spin_lock(&ipv6_sk_mc_lock); 315 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list, 316 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) { 317 struct net_device *dev; 318 319 np->ipv6_mc_list = mc_lst->next; 320 spin_unlock(&ipv6_sk_mc_lock); 321 322 rcu_read_lock(); 323 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 324 if (dev) { 325 struct inet6_dev *idev = __in6_dev_get(dev); 326 327 (void) ip6_mc_leave_src(sk, mc_lst, idev); 328 if (idev) 329 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 330 } else 331 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 332 rcu_read_unlock(); 333 334 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 335 kfree_rcu(mc_lst, rcu); 336 337 spin_lock(&ipv6_sk_mc_lock); 338 } 339 spin_unlock(&ipv6_sk_mc_lock); 340 rtnl_unlock(); 341 } 342 343 int ip6_mc_source(int add, int omode, struct sock *sk, 344 struct group_source_req *pgsr) 345 { 346 struct in6_addr *source, *group; 347 struct ipv6_mc_socklist *pmc; 348 struct inet6_dev *idev; 349 struct ipv6_pinfo *inet6 = inet6_sk(sk); 350 struct ip6_sf_socklist *psl; 351 struct net *net = sock_net(sk); 352 int i, j, rv; 353 int leavegroup = 0; 354 int pmclocked = 0; 355 int err; 356 357 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 358 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 359 360 if (!ipv6_addr_is_multicast(group)) 361 return -EINVAL; 362 363 rcu_read_lock(); 364 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 365 if (!idev) { 366 rcu_read_unlock(); 367 return -ENODEV; 368 } 369 370 err = -EADDRNOTAVAIL; 371 372 for_each_pmc_rcu(inet6, pmc) { 373 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 374 continue; 375 if (ipv6_addr_equal(&pmc->addr, group)) 376 break; 377 } 378 if (!pmc) { /* must have a prior join */ 379 err = -EINVAL; 380 goto done; 381 } 382 /* if a source filter was set, must be the same mode as before */ 383 if (pmc->sflist) { 384 if (pmc->sfmode != omode) { 385 err = -EINVAL; 386 goto done; 387 } 388 } else if (pmc->sfmode != omode) { 389 /* allow mode switches for empty-set filters */ 390 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 391 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 392 pmc->sfmode = omode; 393 } 394 395 write_lock(&pmc->sflock); 396 pmclocked = 1; 397 398 psl = pmc->sflist; 399 if (!add) { 400 if (!psl) 401 goto done; /* err = -EADDRNOTAVAIL */ 402 rv = !0; 403 for (i=0; i<psl->sl_count; i++) { 404 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 405 if (rv == 0) 406 break; 407 } 408 if (rv) /* source not found */ 409 goto done; /* err = -EADDRNOTAVAIL */ 410 411 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 412 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 413 leavegroup = 1; 414 goto done; 415 } 416 417 /* update the interface filter */ 418 ip6_mc_del_src(idev, group, omode, 1, source, 1); 419 420 for (j=i+1; j<psl->sl_count; j++) 421 psl->sl_addr[j-1] = psl->sl_addr[j]; 422 psl->sl_count--; 423 err = 0; 424 goto done; 425 } 426 /* else, add a new source to the filter */ 427 428 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 429 err = -ENOBUFS; 430 goto done; 431 } 432 if (!psl || psl->sl_count == psl->sl_max) { 433 struct ip6_sf_socklist *newpsl; 434 int count = IP6_SFBLOCK; 435 436 if (psl) 437 count += psl->sl_max; 438 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 439 if (!newpsl) { 440 err = -ENOBUFS; 441 goto done; 442 } 443 newpsl->sl_max = count; 444 newpsl->sl_count = count - IP6_SFBLOCK; 445 if (psl) { 446 for (i=0; i<psl->sl_count; i++) 447 newpsl->sl_addr[i] = psl->sl_addr[i]; 448 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 449 } 450 pmc->sflist = psl = newpsl; 451 } 452 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 453 for (i=0; i<psl->sl_count; i++) { 454 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 455 if (rv == 0) /* There is an error in the address. */ 456 goto done; 457 } 458 for (j=psl->sl_count-1; j>=i; j--) 459 psl->sl_addr[j+1] = psl->sl_addr[j]; 460 psl->sl_addr[i] = *source; 461 psl->sl_count++; 462 err = 0; 463 /* update the interface list */ 464 ip6_mc_add_src(idev, group, omode, 1, source, 1); 465 done: 466 if (pmclocked) 467 write_unlock(&pmc->sflock); 468 read_unlock_bh(&idev->lock); 469 rcu_read_unlock(); 470 if (leavegroup) 471 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 472 return err; 473 } 474 475 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 476 { 477 const struct in6_addr *group; 478 struct ipv6_mc_socklist *pmc; 479 struct inet6_dev *idev; 480 struct ipv6_pinfo *inet6 = inet6_sk(sk); 481 struct ip6_sf_socklist *newpsl, *psl; 482 struct net *net = sock_net(sk); 483 int leavegroup = 0; 484 int i, err; 485 486 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 487 488 if (!ipv6_addr_is_multicast(group)) 489 return -EINVAL; 490 if (gsf->gf_fmode != MCAST_INCLUDE && 491 gsf->gf_fmode != MCAST_EXCLUDE) 492 return -EINVAL; 493 494 rcu_read_lock(); 495 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 496 497 if (!idev) { 498 rcu_read_unlock(); 499 return -ENODEV; 500 } 501 502 err = 0; 503 504 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 505 leavegroup = 1; 506 goto done; 507 } 508 509 for_each_pmc_rcu(inet6, pmc) { 510 if (pmc->ifindex != gsf->gf_interface) 511 continue; 512 if (ipv6_addr_equal(&pmc->addr, group)) 513 break; 514 } 515 if (!pmc) { /* must have a prior join */ 516 err = -EINVAL; 517 goto done; 518 } 519 if (gsf->gf_numsrc) { 520 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 521 GFP_ATOMIC); 522 if (!newpsl) { 523 err = -ENOBUFS; 524 goto done; 525 } 526 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 527 for (i=0; i<newpsl->sl_count; ++i) { 528 struct sockaddr_in6 *psin6; 529 530 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 531 newpsl->sl_addr[i] = psin6->sin6_addr; 532 } 533 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 534 newpsl->sl_count, newpsl->sl_addr, 0); 535 if (err) { 536 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 537 goto done; 538 } 539 } else { 540 newpsl = NULL; 541 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 542 } 543 544 write_lock(&pmc->sflock); 545 psl = pmc->sflist; 546 if (psl) { 547 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 548 psl->sl_count, psl->sl_addr, 0); 549 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 550 } else 551 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 552 pmc->sflist = newpsl; 553 pmc->sfmode = gsf->gf_fmode; 554 write_unlock(&pmc->sflock); 555 err = 0; 556 done: 557 read_unlock_bh(&idev->lock); 558 rcu_read_unlock(); 559 if (leavegroup) 560 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 561 return err; 562 } 563 564 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 565 struct group_filter __user *optval, int __user *optlen) 566 { 567 int err, i, count, copycount; 568 const struct in6_addr *group; 569 struct ipv6_mc_socklist *pmc; 570 struct inet6_dev *idev; 571 struct ipv6_pinfo *inet6 = inet6_sk(sk); 572 struct ip6_sf_socklist *psl; 573 struct net *net = sock_net(sk); 574 575 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 576 577 if (!ipv6_addr_is_multicast(group)) 578 return -EINVAL; 579 580 rcu_read_lock(); 581 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 582 583 if (!idev) { 584 rcu_read_unlock(); 585 return -ENODEV; 586 } 587 588 err = -EADDRNOTAVAIL; 589 /* 590 * changes to the ipv6_mc_list require the socket lock and 591 * a read lock on ip6_sk_mc_lock. We have the socket lock, 592 * so reading the list is safe. 593 */ 594 595 for_each_pmc_rcu(inet6, pmc) { 596 if (pmc->ifindex != gsf->gf_interface) 597 continue; 598 if (ipv6_addr_equal(group, &pmc->addr)) 599 break; 600 } 601 if (!pmc) /* must have a prior join */ 602 goto done; 603 gsf->gf_fmode = pmc->sfmode; 604 psl = pmc->sflist; 605 count = psl ? psl->sl_count : 0; 606 read_unlock_bh(&idev->lock); 607 rcu_read_unlock(); 608 609 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 610 gsf->gf_numsrc = count; 611 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 612 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 613 return -EFAULT; 614 } 615 /* changes to psl require the socket lock, a read lock on 616 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 617 * have the socket lock, so reading here is safe. 618 */ 619 for (i=0; i<copycount; i++) { 620 struct sockaddr_in6 *psin6; 621 struct sockaddr_storage ss; 622 623 psin6 = (struct sockaddr_in6 *)&ss; 624 memset(&ss, 0, sizeof(ss)); 625 psin6->sin6_family = AF_INET6; 626 psin6->sin6_addr = psl->sl_addr[i]; 627 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 628 return -EFAULT; 629 } 630 return 0; 631 done: 632 read_unlock_bh(&idev->lock); 633 rcu_read_unlock(); 634 return err; 635 } 636 637 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 638 const struct in6_addr *src_addr) 639 { 640 struct ipv6_pinfo *np = inet6_sk(sk); 641 struct ipv6_mc_socklist *mc; 642 struct ip6_sf_socklist *psl; 643 bool rv = true; 644 645 rcu_read_lock(); 646 for_each_pmc_rcu(np, mc) { 647 if (ipv6_addr_equal(&mc->addr, mc_addr)) 648 break; 649 } 650 if (!mc) { 651 rcu_read_unlock(); 652 return true; 653 } 654 read_lock(&mc->sflock); 655 psl = mc->sflist; 656 if (!psl) { 657 rv = mc->sfmode == MCAST_EXCLUDE; 658 } else { 659 int i; 660 661 for (i=0; i<psl->sl_count; i++) { 662 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 663 break; 664 } 665 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 666 rv = false; 667 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 668 rv = false; 669 } 670 read_unlock(&mc->sflock); 671 rcu_read_unlock(); 672 673 return rv; 674 } 675 676 static void ma_put(struct ifmcaddr6 *mc) 677 { 678 if (atomic_dec_and_test(&mc->mca_refcnt)) { 679 in6_dev_put(mc->idev); 680 kfree(mc); 681 } 682 } 683 684 static void igmp6_group_added(struct ifmcaddr6 *mc) 685 { 686 struct net_device *dev = mc->idev->dev; 687 char buf[MAX_ADDR_LEN]; 688 689 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 690 IPV6_ADDR_SCOPE_LINKLOCAL) 691 return; 692 693 spin_lock_bh(&mc->mca_lock); 694 if (!(mc->mca_flags&MAF_LOADED)) { 695 mc->mca_flags |= MAF_LOADED; 696 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 697 dev_mc_add(dev, buf); 698 } 699 spin_unlock_bh(&mc->mca_lock); 700 701 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 702 return; 703 704 if (mld_in_v1_mode(mc->idev)) { 705 igmp6_join_group(mc); 706 return; 707 } 708 /* else v2 */ 709 710 mc->mca_crcount = mc->idev->mc_qrv; 711 mld_ifc_event(mc->idev); 712 } 713 714 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 715 { 716 struct net_device *dev = mc->idev->dev; 717 char buf[MAX_ADDR_LEN]; 718 719 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 720 IPV6_ADDR_SCOPE_LINKLOCAL) 721 return; 722 723 spin_lock_bh(&mc->mca_lock); 724 if (mc->mca_flags&MAF_LOADED) { 725 mc->mca_flags &= ~MAF_LOADED; 726 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 727 dev_mc_del(dev, buf); 728 } 729 730 if (mc->mca_flags & MAF_NOREPORT) 731 goto done; 732 spin_unlock_bh(&mc->mca_lock); 733 734 if (!mc->idev->dead) 735 igmp6_leave_group(mc); 736 737 spin_lock_bh(&mc->mca_lock); 738 if (del_timer(&mc->mca_timer)) 739 atomic_dec(&mc->mca_refcnt); 740 done: 741 ip6_mc_clear_src(mc); 742 spin_unlock_bh(&mc->mca_lock); 743 } 744 745 /* 746 * deleted ifmcaddr6 manipulation 747 */ 748 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 749 { 750 struct ifmcaddr6 *pmc; 751 752 /* this is an "ifmcaddr6" for convenience; only the fields below 753 * are actually used. In particular, the refcnt and users are not 754 * used for management of the delete list. Using the same structure 755 * for deleted items allows change reports to use common code with 756 * non-deleted or query-response MCA's. 757 */ 758 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 759 if (!pmc) 760 return; 761 762 spin_lock_bh(&im->mca_lock); 763 spin_lock_init(&pmc->mca_lock); 764 pmc->idev = im->idev; 765 in6_dev_hold(idev); 766 pmc->mca_addr = im->mca_addr; 767 pmc->mca_crcount = idev->mc_qrv; 768 pmc->mca_sfmode = im->mca_sfmode; 769 if (pmc->mca_sfmode == MCAST_INCLUDE) { 770 struct ip6_sf_list *psf; 771 772 pmc->mca_tomb = im->mca_tomb; 773 pmc->mca_sources = im->mca_sources; 774 im->mca_tomb = im->mca_sources = NULL; 775 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 776 psf->sf_crcount = pmc->mca_crcount; 777 } 778 spin_unlock_bh(&im->mca_lock); 779 780 spin_lock_bh(&idev->mc_lock); 781 pmc->next = idev->mc_tomb; 782 idev->mc_tomb = pmc; 783 spin_unlock_bh(&idev->mc_lock); 784 } 785 786 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca) 787 { 788 struct ifmcaddr6 *pmc, *pmc_prev; 789 struct ip6_sf_list *psf, *psf_next; 790 791 spin_lock_bh(&idev->mc_lock); 792 pmc_prev = NULL; 793 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 794 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 795 break; 796 pmc_prev = pmc; 797 } 798 if (pmc) { 799 if (pmc_prev) 800 pmc_prev->next = pmc->next; 801 else 802 idev->mc_tomb = pmc->next; 803 } 804 spin_unlock_bh(&idev->mc_lock); 805 806 if (pmc) { 807 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 808 psf_next = psf->sf_next; 809 kfree(psf); 810 } 811 in6_dev_put(pmc->idev); 812 kfree(pmc); 813 } 814 } 815 816 static void mld_clear_delrec(struct inet6_dev *idev) 817 { 818 struct ifmcaddr6 *pmc, *nextpmc; 819 820 spin_lock_bh(&idev->mc_lock); 821 pmc = idev->mc_tomb; 822 idev->mc_tomb = NULL; 823 spin_unlock_bh(&idev->mc_lock); 824 825 for (; pmc; pmc = nextpmc) { 826 nextpmc = pmc->next; 827 ip6_mc_clear_src(pmc); 828 in6_dev_put(pmc->idev); 829 kfree(pmc); 830 } 831 832 /* clear dead sources, too */ 833 read_lock_bh(&idev->lock); 834 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 835 struct ip6_sf_list *psf, *psf_next; 836 837 spin_lock_bh(&pmc->mca_lock); 838 psf = pmc->mca_tomb; 839 pmc->mca_tomb = NULL; 840 spin_unlock_bh(&pmc->mca_lock); 841 for (; psf; psf=psf_next) { 842 psf_next = psf->sf_next; 843 kfree(psf); 844 } 845 } 846 read_unlock_bh(&idev->lock); 847 } 848 849 850 /* 851 * device multicast group inc (add if not found) 852 */ 853 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 854 { 855 struct ifmcaddr6 *mc; 856 struct inet6_dev *idev; 857 858 ASSERT_RTNL(); 859 860 /* we need to take a reference on idev */ 861 idev = in6_dev_get(dev); 862 863 if (idev == NULL) 864 return -EINVAL; 865 866 write_lock_bh(&idev->lock); 867 if (idev->dead) { 868 write_unlock_bh(&idev->lock); 869 in6_dev_put(idev); 870 return -ENODEV; 871 } 872 873 for (mc = idev->mc_list; mc; mc = mc->next) { 874 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 875 mc->mca_users++; 876 write_unlock_bh(&idev->lock); 877 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 878 NULL, 0); 879 in6_dev_put(idev); 880 return 0; 881 } 882 } 883 884 /* 885 * not found: create a new one. 886 */ 887 888 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 889 890 if (mc == NULL) { 891 write_unlock_bh(&idev->lock); 892 in6_dev_put(idev); 893 return -ENOMEM; 894 } 895 896 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 897 898 mc->mca_addr = *addr; 899 mc->idev = idev; /* (reference taken) */ 900 mc->mca_users = 1; 901 /* mca_stamp should be updated upon changes */ 902 mc->mca_cstamp = mc->mca_tstamp = jiffies; 903 atomic_set(&mc->mca_refcnt, 2); 904 spin_lock_init(&mc->mca_lock); 905 906 /* initial mode is (EX, empty) */ 907 mc->mca_sfmode = MCAST_EXCLUDE; 908 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 909 910 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 911 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 912 mc->mca_flags |= MAF_NOREPORT; 913 914 mc->next = idev->mc_list; 915 idev->mc_list = mc; 916 write_unlock_bh(&idev->lock); 917 918 mld_del_delrec(idev, &mc->mca_addr); 919 igmp6_group_added(mc); 920 ma_put(mc); 921 return 0; 922 } 923 924 /* 925 * device multicast group del 926 */ 927 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 928 { 929 struct ifmcaddr6 *ma, **map; 930 931 ASSERT_RTNL(); 932 933 write_lock_bh(&idev->lock); 934 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 935 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 936 if (--ma->mca_users == 0) { 937 *map = ma->next; 938 write_unlock_bh(&idev->lock); 939 940 igmp6_group_dropped(ma); 941 942 ma_put(ma); 943 return 0; 944 } 945 write_unlock_bh(&idev->lock); 946 return 0; 947 } 948 } 949 write_unlock_bh(&idev->lock); 950 951 return -ENOENT; 952 } 953 954 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 955 { 956 struct inet6_dev *idev; 957 int err; 958 959 rcu_read_lock(); 960 961 idev = __in6_dev_get(dev); 962 if (!idev) 963 err = -ENODEV; 964 else 965 err = __ipv6_dev_mc_dec(idev, addr); 966 967 rcu_read_unlock(); 968 return err; 969 } 970 971 /* 972 * check if the interface/address pair is valid 973 */ 974 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 975 const struct in6_addr *src_addr) 976 { 977 struct inet6_dev *idev; 978 struct ifmcaddr6 *mc; 979 bool rv = false; 980 981 rcu_read_lock(); 982 idev = __in6_dev_get(dev); 983 if (idev) { 984 read_lock_bh(&idev->lock); 985 for (mc = idev->mc_list; mc; mc=mc->next) { 986 if (ipv6_addr_equal(&mc->mca_addr, group)) 987 break; 988 } 989 if (mc) { 990 if (src_addr && !ipv6_addr_any(src_addr)) { 991 struct ip6_sf_list *psf; 992 993 spin_lock_bh(&mc->mca_lock); 994 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 995 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 996 break; 997 } 998 if (psf) 999 rv = psf->sf_count[MCAST_INCLUDE] || 1000 psf->sf_count[MCAST_EXCLUDE] != 1001 mc->mca_sfcount[MCAST_EXCLUDE]; 1002 else 1003 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1004 spin_unlock_bh(&mc->mca_lock); 1005 } else 1006 rv = true; /* don't filter unspecified source */ 1007 } 1008 read_unlock_bh(&idev->lock); 1009 } 1010 rcu_read_unlock(); 1011 return rv; 1012 } 1013 1014 static void mld_gq_start_timer(struct inet6_dev *idev) 1015 { 1016 unsigned long tv = prandom_u32() % idev->mc_maxdelay; 1017 1018 idev->mc_gq_running = 1; 1019 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1020 in6_dev_hold(idev); 1021 } 1022 1023 static void mld_gq_stop_timer(struct inet6_dev *idev) 1024 { 1025 idev->mc_gq_running = 0; 1026 if (del_timer(&idev->mc_gq_timer)) 1027 __in6_dev_put(idev); 1028 } 1029 1030 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) 1031 { 1032 unsigned long tv = prandom_u32() % delay; 1033 1034 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1035 in6_dev_hold(idev); 1036 } 1037 1038 static void mld_ifc_stop_timer(struct inet6_dev *idev) 1039 { 1040 idev->mc_ifc_count = 0; 1041 if (del_timer(&idev->mc_ifc_timer)) 1042 __in6_dev_put(idev); 1043 } 1044 1045 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) 1046 { 1047 unsigned long tv = prandom_u32() % delay; 1048 1049 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) 1050 in6_dev_hold(idev); 1051 } 1052 1053 static void mld_dad_stop_timer(struct inet6_dev *idev) 1054 { 1055 if (del_timer(&idev->mc_dad_timer)) 1056 __in6_dev_put(idev); 1057 } 1058 1059 /* 1060 * IGMP handling (alias multicast ICMPv6 messages) 1061 */ 1062 1063 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1064 { 1065 unsigned long delay = resptime; 1066 1067 /* Do not start timer for these addresses */ 1068 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1069 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1070 return; 1071 1072 if (del_timer(&ma->mca_timer)) { 1073 atomic_dec(&ma->mca_refcnt); 1074 delay = ma->mca_timer.expires - jiffies; 1075 } 1076 1077 if (delay >= resptime) 1078 delay = prandom_u32() % resptime; 1079 1080 ma->mca_timer.expires = jiffies + delay; 1081 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1082 atomic_inc(&ma->mca_refcnt); 1083 ma->mca_flags |= MAF_TIMER_RUNNING; 1084 } 1085 1086 /* mark EXCLUDE-mode sources */ 1087 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1088 const struct in6_addr *srcs) 1089 { 1090 struct ip6_sf_list *psf; 1091 int i, scount; 1092 1093 scount = 0; 1094 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1095 if (scount == nsrcs) 1096 break; 1097 for (i=0; i<nsrcs; i++) { 1098 /* skip inactive filters */ 1099 if (psf->sf_count[MCAST_INCLUDE] || 1100 pmc->mca_sfcount[MCAST_EXCLUDE] != 1101 psf->sf_count[MCAST_EXCLUDE]) 1102 break; 1103 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1104 scount++; 1105 break; 1106 } 1107 } 1108 } 1109 pmc->mca_flags &= ~MAF_GSQUERY; 1110 if (scount == nsrcs) /* all sources excluded */ 1111 return false; 1112 return true; 1113 } 1114 1115 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1116 const struct in6_addr *srcs) 1117 { 1118 struct ip6_sf_list *psf; 1119 int i, scount; 1120 1121 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1122 return mld_xmarksources(pmc, nsrcs, srcs); 1123 1124 /* mark INCLUDE-mode sources */ 1125 1126 scount = 0; 1127 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1128 if (scount == nsrcs) 1129 break; 1130 for (i=0; i<nsrcs; i++) { 1131 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1132 psf->sf_gsresp = 1; 1133 scount++; 1134 break; 1135 } 1136 } 1137 } 1138 if (!scount) { 1139 pmc->mca_flags &= ~MAF_GSQUERY; 1140 return false; 1141 } 1142 pmc->mca_flags |= MAF_GSQUERY; 1143 return true; 1144 } 1145 1146 static int mld_force_mld_version(const struct inet6_dev *idev) 1147 { 1148 /* Normally, both are 0 here. If enforcement to a particular is 1149 * being used, individual device enforcement will have a lower 1150 * precedence over 'all' device (.../conf/all/force_mld_version). 1151 */ 1152 1153 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1154 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1155 else 1156 return idev->cnf.force_mld_version; 1157 } 1158 1159 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1160 { 1161 return mld_force_mld_version(idev) == 2; 1162 } 1163 1164 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1165 { 1166 return mld_force_mld_version(idev) == 1; 1167 } 1168 1169 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1170 { 1171 if (mld_in_v2_mode_only(idev)) 1172 return false; 1173 if (mld_in_v1_mode_only(idev)) 1174 return true; 1175 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1176 return true; 1177 1178 return false; 1179 } 1180 1181 static void mld_set_v1_mode(struct inet6_dev *idev) 1182 { 1183 /* RFC3810, relevant sections: 1184 * - 9.1. Robustness Variable 1185 * - 9.2. Query Interval 1186 * - 9.3. Query Response Interval 1187 * - 9.12. Older Version Querier Present Timeout 1188 */ 1189 unsigned long switchback; 1190 1191 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1192 1193 idev->mc_v1_seen = jiffies + switchback; 1194 } 1195 1196 static void mld_update_qrv(struct inet6_dev *idev, 1197 const struct mld2_query *mlh2) 1198 { 1199 /* RFC3810, relevant sections: 1200 * - 5.1.8. QRV (Querier's Robustness Variable) 1201 * - 9.1. Robustness Variable 1202 */ 1203 1204 /* The value of the Robustness Variable MUST NOT be zero, 1205 * and SHOULD NOT be one. Catch this here if we ever run 1206 * into such a case in future. 1207 */ 1208 WARN_ON(idev->mc_qrv == 0); 1209 1210 if (mlh2->mld2q_qrv > 0) 1211 idev->mc_qrv = mlh2->mld2q_qrv; 1212 1213 if (unlikely(idev->mc_qrv < 2)) { 1214 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1215 idev->mc_qrv, MLD_QRV_DEFAULT); 1216 idev->mc_qrv = MLD_QRV_DEFAULT; 1217 } 1218 } 1219 1220 static void mld_update_qi(struct inet6_dev *idev, 1221 const struct mld2_query *mlh2) 1222 { 1223 /* RFC3810, relevant sections: 1224 * - 5.1.9. QQIC (Querier's Query Interval Code) 1225 * - 9.2. Query Interval 1226 * - 9.12. Older Version Querier Present Timeout 1227 * (the [Query Interval] in the last Query received) 1228 */ 1229 unsigned long mc_qqi; 1230 1231 if (mlh2->mld2q_qqic < 128) { 1232 mc_qqi = mlh2->mld2q_qqic; 1233 } else { 1234 unsigned long mc_man, mc_exp; 1235 1236 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1237 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1238 1239 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1240 } 1241 1242 idev->mc_qi = mc_qqi * HZ; 1243 } 1244 1245 static void mld_update_qri(struct inet6_dev *idev, 1246 const struct mld2_query *mlh2) 1247 { 1248 /* RFC3810, relevant sections: 1249 * - 5.1.3. Maximum Response Code 1250 * - 9.3. Query Response Interval 1251 */ 1252 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1253 } 1254 1255 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1256 unsigned long *max_delay) 1257 { 1258 unsigned long mldv1_md; 1259 1260 /* Ignore v1 queries */ 1261 if (mld_in_v2_mode_only(idev)) 1262 return -EINVAL; 1263 1264 /* MLDv1 router present */ 1265 mldv1_md = ntohs(mld->mld_maxdelay); 1266 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1267 1268 mld_set_v1_mode(idev); 1269 1270 /* cancel MLDv2 report timer */ 1271 mld_gq_stop_timer(idev); 1272 /* cancel the interface change timer */ 1273 mld_ifc_stop_timer(idev); 1274 /* clear deleted report items */ 1275 mld_clear_delrec(idev); 1276 1277 return 0; 1278 } 1279 1280 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1281 unsigned long *max_delay) 1282 { 1283 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */ 1284 if (mld_in_v1_mode(idev)) 1285 return -EINVAL; 1286 1287 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1288 1289 mld_update_qrv(idev, mld); 1290 mld_update_qi(idev, mld); 1291 mld_update_qri(idev, mld); 1292 1293 idev->mc_maxdelay = *max_delay; 1294 1295 return 0; 1296 } 1297 1298 /* called with rcu_read_lock() */ 1299 int igmp6_event_query(struct sk_buff *skb) 1300 { 1301 struct mld2_query *mlh2 = NULL; 1302 struct ifmcaddr6 *ma; 1303 const struct in6_addr *group; 1304 unsigned long max_delay; 1305 struct inet6_dev *idev; 1306 struct mld_msg *mld; 1307 int group_type; 1308 int mark = 0; 1309 int len, err; 1310 1311 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1312 return -EINVAL; 1313 1314 /* compute payload length excluding extension headers */ 1315 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1316 len -= skb_network_header_len(skb); 1317 1318 /* RFC3810 6.2 1319 * Upon reception of an MLD message that contains a Query, the node 1320 * checks if the source address of the message is a valid link-local 1321 * address, if the Hop Limit is set to 1, and if the Router Alert 1322 * option is present in the Hop-By-Hop Options header of the IPv6 1323 * packet. If any of these checks fails, the packet is dropped. 1324 */ 1325 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1326 ipv6_hdr(skb)->hop_limit != 1 || 1327 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1328 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1329 return -EINVAL; 1330 1331 idev = __in6_dev_get(skb->dev); 1332 if (idev == NULL) 1333 return 0; 1334 1335 mld = (struct mld_msg *)icmp6_hdr(skb); 1336 group = &mld->mld_mca; 1337 group_type = ipv6_addr_type(group); 1338 1339 if (group_type != IPV6_ADDR_ANY && 1340 !(group_type&IPV6_ADDR_MULTICAST)) 1341 return -EINVAL; 1342 1343 if (len == MLD_V1_QUERY_LEN) { 1344 err = mld_process_v1(idev, mld, &max_delay); 1345 if (err < 0) 1346 return err; 1347 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1348 int srcs_offset = sizeof(struct mld2_query) - 1349 sizeof(struct icmp6hdr); 1350 1351 if (!pskb_may_pull(skb, srcs_offset)) 1352 return -EINVAL; 1353 1354 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1355 1356 err = mld_process_v2(idev, mlh2, &max_delay); 1357 if (err < 0) 1358 return err; 1359 1360 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1361 if (mlh2->mld2q_nsrcs) 1362 return -EINVAL; /* no sources allowed */ 1363 1364 mld_gq_start_timer(idev); 1365 return 0; 1366 } 1367 /* mark sources to include, if group & source-specific */ 1368 if (mlh2->mld2q_nsrcs != 0) { 1369 if (!pskb_may_pull(skb, srcs_offset + 1370 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1371 return -EINVAL; 1372 1373 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1374 mark = 1; 1375 } 1376 } else 1377 return -EINVAL; 1378 1379 read_lock_bh(&idev->lock); 1380 if (group_type == IPV6_ADDR_ANY) { 1381 for (ma = idev->mc_list; ma; ma=ma->next) { 1382 spin_lock_bh(&ma->mca_lock); 1383 igmp6_group_queried(ma, max_delay); 1384 spin_unlock_bh(&ma->mca_lock); 1385 } 1386 } else { 1387 for (ma = idev->mc_list; ma; ma=ma->next) { 1388 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1389 continue; 1390 spin_lock_bh(&ma->mca_lock); 1391 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1392 /* gsquery <- gsquery && mark */ 1393 if (!mark) 1394 ma->mca_flags &= ~MAF_GSQUERY; 1395 } else { 1396 /* gsquery <- mark */ 1397 if (mark) 1398 ma->mca_flags |= MAF_GSQUERY; 1399 else 1400 ma->mca_flags &= ~MAF_GSQUERY; 1401 } 1402 if (!(ma->mca_flags & MAF_GSQUERY) || 1403 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1404 igmp6_group_queried(ma, max_delay); 1405 spin_unlock_bh(&ma->mca_lock); 1406 break; 1407 } 1408 } 1409 read_unlock_bh(&idev->lock); 1410 1411 return 0; 1412 } 1413 1414 /* called with rcu_read_lock() */ 1415 int igmp6_event_report(struct sk_buff *skb) 1416 { 1417 struct ifmcaddr6 *ma; 1418 struct inet6_dev *idev; 1419 struct mld_msg *mld; 1420 int addr_type; 1421 1422 /* Our own report looped back. Ignore it. */ 1423 if (skb->pkt_type == PACKET_LOOPBACK) 1424 return 0; 1425 1426 /* send our report if the MC router may not have heard this report */ 1427 if (skb->pkt_type != PACKET_MULTICAST && 1428 skb->pkt_type != PACKET_BROADCAST) 1429 return 0; 1430 1431 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1432 return -EINVAL; 1433 1434 mld = (struct mld_msg *)icmp6_hdr(skb); 1435 1436 /* Drop reports with not link local source */ 1437 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1438 if (addr_type != IPV6_ADDR_ANY && 1439 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1440 return -EINVAL; 1441 1442 idev = __in6_dev_get(skb->dev); 1443 if (idev == NULL) 1444 return -ENODEV; 1445 1446 /* 1447 * Cancel the timer for this group 1448 */ 1449 1450 read_lock_bh(&idev->lock); 1451 for (ma = idev->mc_list; ma; ma=ma->next) { 1452 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1453 spin_lock(&ma->mca_lock); 1454 if (del_timer(&ma->mca_timer)) 1455 atomic_dec(&ma->mca_refcnt); 1456 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1457 spin_unlock(&ma->mca_lock); 1458 break; 1459 } 1460 } 1461 read_unlock_bh(&idev->lock); 1462 return 0; 1463 } 1464 1465 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1466 int gdeleted, int sdeleted) 1467 { 1468 switch (type) { 1469 case MLD2_MODE_IS_INCLUDE: 1470 case MLD2_MODE_IS_EXCLUDE: 1471 if (gdeleted || sdeleted) 1472 return false; 1473 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1474 if (pmc->mca_sfmode == MCAST_INCLUDE) 1475 return true; 1476 /* don't include if this source is excluded 1477 * in all filters 1478 */ 1479 if (psf->sf_count[MCAST_INCLUDE]) 1480 return type == MLD2_MODE_IS_INCLUDE; 1481 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1482 psf->sf_count[MCAST_EXCLUDE]; 1483 } 1484 return false; 1485 case MLD2_CHANGE_TO_INCLUDE: 1486 if (gdeleted || sdeleted) 1487 return false; 1488 return psf->sf_count[MCAST_INCLUDE] != 0; 1489 case MLD2_CHANGE_TO_EXCLUDE: 1490 if (gdeleted || sdeleted) 1491 return false; 1492 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1493 psf->sf_count[MCAST_INCLUDE]) 1494 return false; 1495 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1496 psf->sf_count[MCAST_EXCLUDE]; 1497 case MLD2_ALLOW_NEW_SOURCES: 1498 if (gdeleted || !psf->sf_crcount) 1499 return false; 1500 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1501 case MLD2_BLOCK_OLD_SOURCES: 1502 if (pmc->mca_sfmode == MCAST_INCLUDE) 1503 return gdeleted || (psf->sf_crcount && sdeleted); 1504 return psf->sf_crcount && !gdeleted && !sdeleted; 1505 } 1506 return false; 1507 } 1508 1509 static int 1510 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1511 { 1512 struct ip6_sf_list *psf; 1513 int scount = 0; 1514 1515 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1516 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1517 continue; 1518 scount++; 1519 } 1520 return scount; 1521 } 1522 1523 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1524 struct net_device *dev, 1525 const struct in6_addr *saddr, 1526 const struct in6_addr *daddr, 1527 int proto, int len) 1528 { 1529 struct ipv6hdr *hdr; 1530 1531 skb->protocol = htons(ETH_P_IPV6); 1532 skb->dev = dev; 1533 1534 skb_reset_network_header(skb); 1535 skb_put(skb, sizeof(struct ipv6hdr)); 1536 hdr = ipv6_hdr(skb); 1537 1538 ip6_flow_hdr(hdr, 0, 0); 1539 1540 hdr->payload_len = htons(len); 1541 hdr->nexthdr = proto; 1542 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1543 1544 hdr->saddr = *saddr; 1545 hdr->daddr = *daddr; 1546 } 1547 1548 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size) 1549 { 1550 struct net_device *dev = idev->dev; 1551 struct net *net = dev_net(dev); 1552 struct sock *sk = net->ipv6.igmp_sk; 1553 struct sk_buff *skb; 1554 struct mld2_report *pmr; 1555 struct in6_addr addr_buf; 1556 const struct in6_addr *saddr; 1557 int hlen = LL_RESERVED_SPACE(dev); 1558 int tlen = dev->needed_tailroom; 1559 int err; 1560 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1561 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1562 IPV6_TLV_PADN, 0 }; 1563 1564 /* we assume size > sizeof(ra) here */ 1565 size += hlen + tlen; 1566 /* limit our allocations to order-0 page */ 1567 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1568 skb = sock_alloc_send_skb(sk, size, 1, &err); 1569 1570 if (!skb) 1571 return NULL; 1572 1573 skb->priority = TC_PRIO_CONTROL; 1574 skb_reserve(skb, hlen); 1575 1576 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1577 /* <draft-ietf-magma-mld-source-05.txt>: 1578 * use unspecified address as the source address 1579 * when a valid link-local address is not available. 1580 */ 1581 saddr = &in6addr_any; 1582 } else 1583 saddr = &addr_buf; 1584 1585 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1586 1587 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1588 1589 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1590 skb_put(skb, sizeof(*pmr)); 1591 pmr = (struct mld2_report *)skb_transport_header(skb); 1592 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1593 pmr->mld2r_resv1 = 0; 1594 pmr->mld2r_cksum = 0; 1595 pmr->mld2r_resv2 = 0; 1596 pmr->mld2r_ngrec = 0; 1597 return skb; 1598 } 1599 1600 static void mld_sendpack(struct sk_buff *skb) 1601 { 1602 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1603 struct mld2_report *pmr = 1604 (struct mld2_report *)skb_transport_header(skb); 1605 int payload_len, mldlen; 1606 struct inet6_dev *idev; 1607 struct net *net = dev_net(skb->dev); 1608 int err; 1609 struct flowi6 fl6; 1610 struct dst_entry *dst; 1611 1612 rcu_read_lock(); 1613 idev = __in6_dev_get(skb->dev); 1614 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1615 1616 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1617 sizeof(*pip6); 1618 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1619 pip6->payload_len = htons(payload_len); 1620 1621 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1622 IPPROTO_ICMPV6, 1623 csum_partial(skb_transport_header(skb), 1624 mldlen, 0)); 1625 1626 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1627 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1628 skb->dev->ifindex); 1629 dst = icmp6_dst_alloc(skb->dev, &fl6); 1630 1631 err = 0; 1632 if (IS_ERR(dst)) { 1633 err = PTR_ERR(dst); 1634 dst = NULL; 1635 } 1636 skb_dst_set(skb, dst); 1637 if (err) 1638 goto err_out; 1639 1640 payload_len = skb->len; 1641 1642 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1643 dst_output); 1644 out: 1645 if (!err) { 1646 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1647 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1648 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1649 } else { 1650 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1651 } 1652 1653 rcu_read_unlock(); 1654 return; 1655 1656 err_out: 1657 kfree_skb(skb); 1658 goto out; 1659 } 1660 1661 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1662 { 1663 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1664 } 1665 1666 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1667 int type, struct mld2_grec **ppgr) 1668 { 1669 struct net_device *dev = pmc->idev->dev; 1670 struct mld2_report *pmr; 1671 struct mld2_grec *pgr; 1672 1673 if (!skb) 1674 skb = mld_newpack(pmc->idev, dev->mtu); 1675 if (!skb) 1676 return NULL; 1677 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1678 pgr->grec_type = type; 1679 pgr->grec_auxwords = 0; 1680 pgr->grec_nsrcs = 0; 1681 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1682 pmr = (struct mld2_report *)skb_transport_header(skb); 1683 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1684 *ppgr = pgr; 1685 return skb; 1686 } 1687 1688 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1689 skb_tailroom(skb)) : 0) 1690 1691 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1692 int type, int gdeleted, int sdeleted, int crsend) 1693 { 1694 struct inet6_dev *idev = pmc->idev; 1695 struct net_device *dev = idev->dev; 1696 struct mld2_report *pmr; 1697 struct mld2_grec *pgr = NULL; 1698 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1699 int scount, stotal, first, isquery, truncate; 1700 1701 if (pmc->mca_flags & MAF_NOREPORT) 1702 return skb; 1703 1704 isquery = type == MLD2_MODE_IS_INCLUDE || 1705 type == MLD2_MODE_IS_EXCLUDE; 1706 truncate = type == MLD2_MODE_IS_EXCLUDE || 1707 type == MLD2_CHANGE_TO_EXCLUDE; 1708 1709 stotal = scount = 0; 1710 1711 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1712 1713 if (!*psf_list) 1714 goto empty_source; 1715 1716 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1717 1718 /* EX and TO_EX get a fresh packet, if needed */ 1719 if (truncate) { 1720 if (pmr && pmr->mld2r_ngrec && 1721 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1722 if (skb) 1723 mld_sendpack(skb); 1724 skb = mld_newpack(idev, dev->mtu); 1725 } 1726 } 1727 first = 1; 1728 psf_prev = NULL; 1729 for (psf=*psf_list; psf; psf=psf_next) { 1730 struct in6_addr *psrc; 1731 1732 psf_next = psf->sf_next; 1733 1734 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1735 psf_prev = psf; 1736 continue; 1737 } 1738 1739 /* clear marks on query responses */ 1740 if (isquery) 1741 psf->sf_gsresp = 0; 1742 1743 if (AVAILABLE(skb) < sizeof(*psrc) + 1744 first*sizeof(struct mld2_grec)) { 1745 if (truncate && !first) 1746 break; /* truncate these */ 1747 if (pgr) 1748 pgr->grec_nsrcs = htons(scount); 1749 if (skb) 1750 mld_sendpack(skb); 1751 skb = mld_newpack(idev, dev->mtu); 1752 first = 1; 1753 scount = 0; 1754 } 1755 if (first) { 1756 skb = add_grhead(skb, pmc, type, &pgr); 1757 first = 0; 1758 } 1759 if (!skb) 1760 return NULL; 1761 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1762 *psrc = psf->sf_addr; 1763 scount++; stotal++; 1764 if ((type == MLD2_ALLOW_NEW_SOURCES || 1765 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1766 psf->sf_crcount--; 1767 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1768 if (psf_prev) 1769 psf_prev->sf_next = psf->sf_next; 1770 else 1771 *psf_list = psf->sf_next; 1772 kfree(psf); 1773 continue; 1774 } 1775 } 1776 psf_prev = psf; 1777 } 1778 1779 empty_source: 1780 if (!stotal) { 1781 if (type == MLD2_ALLOW_NEW_SOURCES || 1782 type == MLD2_BLOCK_OLD_SOURCES) 1783 return skb; 1784 if (pmc->mca_crcount || isquery || crsend) { 1785 /* make sure we have room for group header */ 1786 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1787 mld_sendpack(skb); 1788 skb = NULL; /* add_grhead will get a new one */ 1789 } 1790 skb = add_grhead(skb, pmc, type, &pgr); 1791 } 1792 } 1793 if (pgr) 1794 pgr->grec_nsrcs = htons(scount); 1795 1796 if (isquery) 1797 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1798 return skb; 1799 } 1800 1801 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1802 { 1803 struct sk_buff *skb = NULL; 1804 int type; 1805 1806 read_lock_bh(&idev->lock); 1807 if (!pmc) { 1808 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1809 if (pmc->mca_flags & MAF_NOREPORT) 1810 continue; 1811 spin_lock_bh(&pmc->mca_lock); 1812 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1813 type = MLD2_MODE_IS_EXCLUDE; 1814 else 1815 type = MLD2_MODE_IS_INCLUDE; 1816 skb = add_grec(skb, pmc, type, 0, 0, 0); 1817 spin_unlock_bh(&pmc->mca_lock); 1818 } 1819 } else { 1820 spin_lock_bh(&pmc->mca_lock); 1821 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1822 type = MLD2_MODE_IS_EXCLUDE; 1823 else 1824 type = MLD2_MODE_IS_INCLUDE; 1825 skb = add_grec(skb, pmc, type, 0, 0, 0); 1826 spin_unlock_bh(&pmc->mca_lock); 1827 } 1828 read_unlock_bh(&idev->lock); 1829 if (skb) 1830 mld_sendpack(skb); 1831 } 1832 1833 /* 1834 * remove zero-count source records from a source filter list 1835 */ 1836 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1837 { 1838 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1839 1840 psf_prev = NULL; 1841 for (psf=*ppsf; psf; psf = psf_next) { 1842 psf_next = psf->sf_next; 1843 if (psf->sf_crcount == 0) { 1844 if (psf_prev) 1845 psf_prev->sf_next = psf->sf_next; 1846 else 1847 *ppsf = psf->sf_next; 1848 kfree(psf); 1849 } else 1850 psf_prev = psf; 1851 } 1852 } 1853 1854 static void mld_send_cr(struct inet6_dev *idev) 1855 { 1856 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1857 struct sk_buff *skb = NULL; 1858 int type, dtype; 1859 1860 read_lock_bh(&idev->lock); 1861 spin_lock(&idev->mc_lock); 1862 1863 /* deleted MCA's */ 1864 pmc_prev = NULL; 1865 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1866 pmc_next = pmc->next; 1867 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1868 type = MLD2_BLOCK_OLD_SOURCES; 1869 dtype = MLD2_BLOCK_OLD_SOURCES; 1870 skb = add_grec(skb, pmc, type, 1, 0, 0); 1871 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 1872 } 1873 if (pmc->mca_crcount) { 1874 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1875 type = MLD2_CHANGE_TO_INCLUDE; 1876 skb = add_grec(skb, pmc, type, 1, 0, 0); 1877 } 1878 pmc->mca_crcount--; 1879 if (pmc->mca_crcount == 0) { 1880 mld_clear_zeros(&pmc->mca_tomb); 1881 mld_clear_zeros(&pmc->mca_sources); 1882 } 1883 } 1884 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1885 !pmc->mca_sources) { 1886 if (pmc_prev) 1887 pmc_prev->next = pmc_next; 1888 else 1889 idev->mc_tomb = pmc_next; 1890 in6_dev_put(pmc->idev); 1891 kfree(pmc); 1892 } else 1893 pmc_prev = pmc; 1894 } 1895 spin_unlock(&idev->mc_lock); 1896 1897 /* change recs */ 1898 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1899 spin_lock_bh(&pmc->mca_lock); 1900 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1901 type = MLD2_BLOCK_OLD_SOURCES; 1902 dtype = MLD2_ALLOW_NEW_SOURCES; 1903 } else { 1904 type = MLD2_ALLOW_NEW_SOURCES; 1905 dtype = MLD2_BLOCK_OLD_SOURCES; 1906 } 1907 skb = add_grec(skb, pmc, type, 0, 0, 0); 1908 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 1909 1910 /* filter mode changes */ 1911 if (pmc->mca_crcount) { 1912 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1913 type = MLD2_CHANGE_TO_EXCLUDE; 1914 else 1915 type = MLD2_CHANGE_TO_INCLUDE; 1916 skb = add_grec(skb, pmc, type, 0, 0, 0); 1917 pmc->mca_crcount--; 1918 } 1919 spin_unlock_bh(&pmc->mca_lock); 1920 } 1921 read_unlock_bh(&idev->lock); 1922 if (!skb) 1923 return; 1924 (void) mld_sendpack(skb); 1925 } 1926 1927 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1928 { 1929 struct net *net = dev_net(dev); 1930 struct sock *sk = net->ipv6.igmp_sk; 1931 struct inet6_dev *idev; 1932 struct sk_buff *skb; 1933 struct mld_msg *hdr; 1934 const struct in6_addr *snd_addr, *saddr; 1935 struct in6_addr addr_buf; 1936 int hlen = LL_RESERVED_SPACE(dev); 1937 int tlen = dev->needed_tailroom; 1938 int err, len, payload_len, full_len; 1939 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1940 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1941 IPV6_TLV_PADN, 0 }; 1942 struct flowi6 fl6; 1943 struct dst_entry *dst; 1944 1945 if (type == ICMPV6_MGM_REDUCTION) 1946 snd_addr = &in6addr_linklocal_allrouters; 1947 else 1948 snd_addr = addr; 1949 1950 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1951 payload_len = len + sizeof(ra); 1952 full_len = sizeof(struct ipv6hdr) + payload_len; 1953 1954 rcu_read_lock(); 1955 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1956 IPSTATS_MIB_OUT, full_len); 1957 rcu_read_unlock(); 1958 1959 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1960 1961 if (skb == NULL) { 1962 rcu_read_lock(); 1963 IP6_INC_STATS(net, __in6_dev_get(dev), 1964 IPSTATS_MIB_OUTDISCARDS); 1965 rcu_read_unlock(); 1966 return; 1967 } 1968 skb->priority = TC_PRIO_CONTROL; 1969 skb_reserve(skb, hlen); 1970 1971 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1972 /* <draft-ietf-magma-mld-source-05.txt>: 1973 * use unspecified address as the source address 1974 * when a valid link-local address is not available. 1975 */ 1976 saddr = &in6addr_any; 1977 } else 1978 saddr = &addr_buf; 1979 1980 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1981 1982 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1983 1984 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1985 memset(hdr, 0, sizeof(struct mld_msg)); 1986 hdr->mld_type = type; 1987 hdr->mld_mca = *addr; 1988 1989 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1990 IPPROTO_ICMPV6, 1991 csum_partial(hdr, len, 0)); 1992 1993 rcu_read_lock(); 1994 idev = __in6_dev_get(skb->dev); 1995 1996 icmpv6_flow_init(sk, &fl6, type, 1997 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1998 skb->dev->ifindex); 1999 dst = icmp6_dst_alloc(skb->dev, &fl6); 2000 if (IS_ERR(dst)) { 2001 err = PTR_ERR(dst); 2002 goto err_out; 2003 } 2004 2005 skb_dst_set(skb, dst); 2006 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 2007 dst_output); 2008 out: 2009 if (!err) { 2010 ICMP6MSGOUT_INC_STATS(net, idev, type); 2011 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2012 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 2013 } else 2014 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2015 2016 rcu_read_unlock(); 2017 return; 2018 2019 err_out: 2020 kfree_skb(skb); 2021 goto out; 2022 } 2023 2024 static void mld_send_initial_cr(struct inet6_dev *idev) 2025 { 2026 struct sk_buff *skb; 2027 struct ifmcaddr6 *pmc; 2028 int type; 2029 2030 if (mld_in_v1_mode(idev)) 2031 return; 2032 2033 skb = NULL; 2034 read_lock_bh(&idev->lock); 2035 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2036 spin_lock_bh(&pmc->mca_lock); 2037 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2038 type = MLD2_CHANGE_TO_EXCLUDE; 2039 else 2040 type = MLD2_CHANGE_TO_INCLUDE; 2041 skb = add_grec(skb, pmc, type, 0, 0, 1); 2042 spin_unlock_bh(&pmc->mca_lock); 2043 } 2044 read_unlock_bh(&idev->lock); 2045 if (skb) 2046 mld_sendpack(skb); 2047 } 2048 2049 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2050 { 2051 idev->mc_dad_count = idev->mc_qrv; 2052 if (idev->mc_dad_count) { 2053 mld_send_initial_cr(idev); 2054 idev->mc_dad_count--; 2055 if (idev->mc_dad_count) 2056 mld_dad_start_timer(idev, idev->mc_maxdelay); 2057 } 2058 } 2059 2060 static void mld_dad_timer_expire(unsigned long data) 2061 { 2062 struct inet6_dev *idev = (struct inet6_dev *)data; 2063 2064 mld_send_initial_cr(idev); 2065 if (idev->mc_dad_count) { 2066 idev->mc_dad_count--; 2067 if (idev->mc_dad_count) 2068 mld_dad_start_timer(idev, idev->mc_maxdelay); 2069 } 2070 in6_dev_put(idev); 2071 } 2072 2073 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2074 const struct in6_addr *psfsrc) 2075 { 2076 struct ip6_sf_list *psf, *psf_prev; 2077 int rv = 0; 2078 2079 psf_prev = NULL; 2080 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2081 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2082 break; 2083 psf_prev = psf; 2084 } 2085 if (!psf || psf->sf_count[sfmode] == 0) { 2086 /* source filter not found, or count wrong => bug */ 2087 return -ESRCH; 2088 } 2089 psf->sf_count[sfmode]--; 2090 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2091 struct inet6_dev *idev = pmc->idev; 2092 2093 /* no more filters for this source */ 2094 if (psf_prev) 2095 psf_prev->sf_next = psf->sf_next; 2096 else 2097 pmc->mca_sources = psf->sf_next; 2098 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2099 !mld_in_v1_mode(idev)) { 2100 psf->sf_crcount = idev->mc_qrv; 2101 psf->sf_next = pmc->mca_tomb; 2102 pmc->mca_tomb = psf; 2103 rv = 1; 2104 } else 2105 kfree(psf); 2106 } 2107 return rv; 2108 } 2109 2110 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2111 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2112 int delta) 2113 { 2114 struct ifmcaddr6 *pmc; 2115 int changerec = 0; 2116 int i, err; 2117 2118 if (!idev) 2119 return -ENODEV; 2120 read_lock_bh(&idev->lock); 2121 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2122 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2123 break; 2124 } 2125 if (!pmc) { 2126 /* MCA not found?? bug */ 2127 read_unlock_bh(&idev->lock); 2128 return -ESRCH; 2129 } 2130 spin_lock_bh(&pmc->mca_lock); 2131 sf_markstate(pmc); 2132 if (!delta) { 2133 if (!pmc->mca_sfcount[sfmode]) { 2134 spin_unlock_bh(&pmc->mca_lock); 2135 read_unlock_bh(&idev->lock); 2136 return -EINVAL; 2137 } 2138 pmc->mca_sfcount[sfmode]--; 2139 } 2140 err = 0; 2141 for (i=0; i<sfcount; i++) { 2142 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2143 2144 changerec |= rv > 0; 2145 if (!err && rv < 0) 2146 err = rv; 2147 } 2148 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2149 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2150 pmc->mca_sfcount[MCAST_INCLUDE]) { 2151 struct ip6_sf_list *psf; 2152 2153 /* filter mode change */ 2154 pmc->mca_sfmode = MCAST_INCLUDE; 2155 pmc->mca_crcount = idev->mc_qrv; 2156 idev->mc_ifc_count = pmc->mca_crcount; 2157 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2158 psf->sf_crcount = 0; 2159 mld_ifc_event(pmc->idev); 2160 } else if (sf_setstate(pmc) || changerec) 2161 mld_ifc_event(pmc->idev); 2162 spin_unlock_bh(&pmc->mca_lock); 2163 read_unlock_bh(&idev->lock); 2164 return err; 2165 } 2166 2167 /* 2168 * Add multicast single-source filter to the interface list 2169 */ 2170 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2171 const struct in6_addr *psfsrc) 2172 { 2173 struct ip6_sf_list *psf, *psf_prev; 2174 2175 psf_prev = NULL; 2176 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2177 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2178 break; 2179 psf_prev = psf; 2180 } 2181 if (!psf) { 2182 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 2183 if (!psf) 2184 return -ENOBUFS; 2185 2186 psf->sf_addr = *psfsrc; 2187 if (psf_prev) { 2188 psf_prev->sf_next = psf; 2189 } else 2190 pmc->mca_sources = psf; 2191 } 2192 psf->sf_count[sfmode]++; 2193 return 0; 2194 } 2195 2196 static void sf_markstate(struct ifmcaddr6 *pmc) 2197 { 2198 struct ip6_sf_list *psf; 2199 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2200 2201 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 2202 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2203 psf->sf_oldin = mca_xcount == 2204 psf->sf_count[MCAST_EXCLUDE] && 2205 !psf->sf_count[MCAST_INCLUDE]; 2206 } else 2207 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2208 } 2209 2210 static int sf_setstate(struct ifmcaddr6 *pmc) 2211 { 2212 struct ip6_sf_list *psf, *dpsf; 2213 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2214 int qrv = pmc->idev->mc_qrv; 2215 int new_in, rv; 2216 2217 rv = 0; 2218 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2219 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2220 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2221 !psf->sf_count[MCAST_INCLUDE]; 2222 } else 2223 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2224 if (new_in) { 2225 if (!psf->sf_oldin) { 2226 struct ip6_sf_list *prev = NULL; 2227 2228 for (dpsf=pmc->mca_tomb; dpsf; 2229 dpsf=dpsf->sf_next) { 2230 if (ipv6_addr_equal(&dpsf->sf_addr, 2231 &psf->sf_addr)) 2232 break; 2233 prev = dpsf; 2234 } 2235 if (dpsf) { 2236 if (prev) 2237 prev->sf_next = dpsf->sf_next; 2238 else 2239 pmc->mca_tomb = dpsf->sf_next; 2240 kfree(dpsf); 2241 } 2242 psf->sf_crcount = qrv; 2243 rv++; 2244 } 2245 } else if (psf->sf_oldin) { 2246 psf->sf_crcount = 0; 2247 /* 2248 * add or update "delete" records if an active filter 2249 * is now inactive 2250 */ 2251 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2252 if (ipv6_addr_equal(&dpsf->sf_addr, 2253 &psf->sf_addr)) 2254 break; 2255 if (!dpsf) { 2256 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2257 if (!dpsf) 2258 continue; 2259 *dpsf = *psf; 2260 /* pmc->mca_lock held by callers */ 2261 dpsf->sf_next = pmc->mca_tomb; 2262 pmc->mca_tomb = dpsf; 2263 } 2264 dpsf->sf_crcount = qrv; 2265 rv++; 2266 } 2267 } 2268 return rv; 2269 } 2270 2271 /* 2272 * Add multicast source filter list to the interface list 2273 */ 2274 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2275 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2276 int delta) 2277 { 2278 struct ifmcaddr6 *pmc; 2279 int isexclude; 2280 int i, err; 2281 2282 if (!idev) 2283 return -ENODEV; 2284 read_lock_bh(&idev->lock); 2285 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2286 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2287 break; 2288 } 2289 if (!pmc) { 2290 /* MCA not found?? bug */ 2291 read_unlock_bh(&idev->lock); 2292 return -ESRCH; 2293 } 2294 spin_lock_bh(&pmc->mca_lock); 2295 2296 sf_markstate(pmc); 2297 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2298 if (!delta) 2299 pmc->mca_sfcount[sfmode]++; 2300 err = 0; 2301 for (i=0; i<sfcount; i++) { 2302 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2303 if (err) 2304 break; 2305 } 2306 if (err) { 2307 int j; 2308 2309 if (!delta) 2310 pmc->mca_sfcount[sfmode]--; 2311 for (j=0; j<i; j++) 2312 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2313 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2314 struct ip6_sf_list *psf; 2315 2316 /* filter mode change */ 2317 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2318 pmc->mca_sfmode = MCAST_EXCLUDE; 2319 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2320 pmc->mca_sfmode = MCAST_INCLUDE; 2321 /* else no filters; keep old mode for reports */ 2322 2323 pmc->mca_crcount = idev->mc_qrv; 2324 idev->mc_ifc_count = pmc->mca_crcount; 2325 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2326 psf->sf_crcount = 0; 2327 mld_ifc_event(idev); 2328 } else if (sf_setstate(pmc)) 2329 mld_ifc_event(idev); 2330 spin_unlock_bh(&pmc->mca_lock); 2331 read_unlock_bh(&idev->lock); 2332 return err; 2333 } 2334 2335 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2336 { 2337 struct ip6_sf_list *psf, *nextpsf; 2338 2339 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2340 nextpsf = psf->sf_next; 2341 kfree(psf); 2342 } 2343 pmc->mca_tomb = NULL; 2344 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2345 nextpsf = psf->sf_next; 2346 kfree(psf); 2347 } 2348 pmc->mca_sources = NULL; 2349 pmc->mca_sfmode = MCAST_EXCLUDE; 2350 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2351 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2352 } 2353 2354 2355 static void igmp6_join_group(struct ifmcaddr6 *ma) 2356 { 2357 unsigned long delay; 2358 2359 if (ma->mca_flags & MAF_NOREPORT) 2360 return; 2361 2362 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2363 2364 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2365 2366 spin_lock_bh(&ma->mca_lock); 2367 if (del_timer(&ma->mca_timer)) { 2368 atomic_dec(&ma->mca_refcnt); 2369 delay = ma->mca_timer.expires - jiffies; 2370 } 2371 2372 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2373 atomic_inc(&ma->mca_refcnt); 2374 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2375 spin_unlock_bh(&ma->mca_lock); 2376 } 2377 2378 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2379 struct inet6_dev *idev) 2380 { 2381 int err; 2382 2383 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2384 * so no other readers or writers of iml or its sflist 2385 */ 2386 if (!iml->sflist) { 2387 /* any-source empty exclude case */ 2388 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2389 } 2390 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2391 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2392 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2393 iml->sflist = NULL; 2394 return err; 2395 } 2396 2397 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2398 { 2399 if (mld_in_v1_mode(ma->idev)) { 2400 if (ma->mca_flags & MAF_LAST_REPORTER) 2401 igmp6_send(&ma->mca_addr, ma->idev->dev, 2402 ICMPV6_MGM_REDUCTION); 2403 } else { 2404 mld_add_delrec(ma->idev, ma); 2405 mld_ifc_event(ma->idev); 2406 } 2407 } 2408 2409 static void mld_gq_timer_expire(unsigned long data) 2410 { 2411 struct inet6_dev *idev = (struct inet6_dev *)data; 2412 2413 idev->mc_gq_running = 0; 2414 mld_send_report(idev, NULL); 2415 in6_dev_put(idev); 2416 } 2417 2418 static void mld_ifc_timer_expire(unsigned long data) 2419 { 2420 struct inet6_dev *idev = (struct inet6_dev *)data; 2421 2422 mld_send_cr(idev); 2423 if (idev->mc_ifc_count) { 2424 idev->mc_ifc_count--; 2425 if (idev->mc_ifc_count) 2426 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2427 } 2428 in6_dev_put(idev); 2429 } 2430 2431 static void mld_ifc_event(struct inet6_dev *idev) 2432 { 2433 if (mld_in_v1_mode(idev)) 2434 return; 2435 idev->mc_ifc_count = idev->mc_qrv; 2436 mld_ifc_start_timer(idev, 1); 2437 } 2438 2439 2440 static void igmp6_timer_handler(unsigned long data) 2441 { 2442 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2443 2444 if (mld_in_v1_mode(ma->idev)) 2445 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2446 else 2447 mld_send_report(ma->idev, ma); 2448 2449 spin_lock(&ma->mca_lock); 2450 ma->mca_flags |= MAF_LAST_REPORTER; 2451 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2452 spin_unlock(&ma->mca_lock); 2453 ma_put(ma); 2454 } 2455 2456 /* Device changing type */ 2457 2458 void ipv6_mc_unmap(struct inet6_dev *idev) 2459 { 2460 struct ifmcaddr6 *i; 2461 2462 /* Install multicast list, except for all-nodes (already installed) */ 2463 2464 read_lock_bh(&idev->lock); 2465 for (i = idev->mc_list; i; i = i->next) 2466 igmp6_group_dropped(i); 2467 read_unlock_bh(&idev->lock); 2468 } 2469 2470 void ipv6_mc_remap(struct inet6_dev *idev) 2471 { 2472 ipv6_mc_up(idev); 2473 } 2474 2475 /* Device going down */ 2476 2477 void ipv6_mc_down(struct inet6_dev *idev) 2478 { 2479 struct ifmcaddr6 *i; 2480 2481 /* Withdraw multicast list */ 2482 2483 read_lock_bh(&idev->lock); 2484 mld_ifc_stop_timer(idev); 2485 mld_gq_stop_timer(idev); 2486 mld_dad_stop_timer(idev); 2487 2488 for (i = idev->mc_list; i; i=i->next) 2489 igmp6_group_dropped(i); 2490 read_unlock_bh(&idev->lock); 2491 2492 mld_clear_delrec(idev); 2493 } 2494 2495 2496 /* Device going up */ 2497 2498 void ipv6_mc_up(struct inet6_dev *idev) 2499 { 2500 struct ifmcaddr6 *i; 2501 2502 /* Install multicast list, except for all-nodes (already installed) */ 2503 2504 read_lock_bh(&idev->lock); 2505 for (i = idev->mc_list; i; i=i->next) 2506 igmp6_group_added(i); 2507 read_unlock_bh(&idev->lock); 2508 } 2509 2510 /* IPv6 device initialization. */ 2511 2512 void ipv6_mc_init_dev(struct inet6_dev *idev) 2513 { 2514 write_lock_bh(&idev->lock); 2515 spin_lock_init(&idev->mc_lock); 2516 idev->mc_gq_running = 0; 2517 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2518 (unsigned long)idev); 2519 idev->mc_tomb = NULL; 2520 idev->mc_ifc_count = 0; 2521 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2522 (unsigned long)idev); 2523 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, 2524 (unsigned long)idev); 2525 2526 idev->mc_qrv = MLD_QRV_DEFAULT; 2527 idev->mc_qi = MLD_QI_DEFAULT; 2528 idev->mc_qri = MLD_QRI_DEFAULT; 2529 2530 idev->mc_maxdelay = unsolicited_report_interval(idev); 2531 idev->mc_v1_seen = 0; 2532 write_unlock_bh(&idev->lock); 2533 } 2534 2535 /* 2536 * Device is about to be destroyed: clean up. 2537 */ 2538 2539 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2540 { 2541 struct ifmcaddr6 *i; 2542 2543 /* Deactivate timers */ 2544 ipv6_mc_down(idev); 2545 2546 /* Delete all-nodes address. */ 2547 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2548 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2549 * fail. 2550 */ 2551 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2552 2553 if (idev->cnf.forwarding) 2554 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2555 2556 write_lock_bh(&idev->lock); 2557 while ((i = idev->mc_list) != NULL) { 2558 idev->mc_list = i->next; 2559 write_unlock_bh(&idev->lock); 2560 2561 igmp6_group_dropped(i); 2562 ma_put(i); 2563 2564 write_lock_bh(&idev->lock); 2565 } 2566 write_unlock_bh(&idev->lock); 2567 } 2568 2569 #ifdef CONFIG_PROC_FS 2570 struct igmp6_mc_iter_state { 2571 struct seq_net_private p; 2572 struct net_device *dev; 2573 struct inet6_dev *idev; 2574 }; 2575 2576 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2577 2578 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2579 { 2580 struct ifmcaddr6 *im = NULL; 2581 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2582 struct net *net = seq_file_net(seq); 2583 2584 state->idev = NULL; 2585 for_each_netdev_rcu(net, state->dev) { 2586 struct inet6_dev *idev; 2587 idev = __in6_dev_get(state->dev); 2588 if (!idev) 2589 continue; 2590 read_lock_bh(&idev->lock); 2591 im = idev->mc_list; 2592 if (im) { 2593 state->idev = idev; 2594 break; 2595 } 2596 read_unlock_bh(&idev->lock); 2597 } 2598 return im; 2599 } 2600 2601 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2602 { 2603 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2604 2605 im = im->next; 2606 while (!im) { 2607 if (likely(state->idev != NULL)) 2608 read_unlock_bh(&state->idev->lock); 2609 2610 state->dev = next_net_device_rcu(state->dev); 2611 if (!state->dev) { 2612 state->idev = NULL; 2613 break; 2614 } 2615 state->idev = __in6_dev_get(state->dev); 2616 if (!state->idev) 2617 continue; 2618 read_lock_bh(&state->idev->lock); 2619 im = state->idev->mc_list; 2620 } 2621 return im; 2622 } 2623 2624 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2625 { 2626 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2627 if (im) 2628 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2629 --pos; 2630 return pos ? NULL : im; 2631 } 2632 2633 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2634 __acquires(RCU) 2635 { 2636 rcu_read_lock(); 2637 return igmp6_mc_get_idx(seq, *pos); 2638 } 2639 2640 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2641 { 2642 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2643 2644 ++*pos; 2645 return im; 2646 } 2647 2648 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2649 __releases(RCU) 2650 { 2651 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2652 2653 if (likely(state->idev != NULL)) { 2654 read_unlock_bh(&state->idev->lock); 2655 state->idev = NULL; 2656 } 2657 state->dev = NULL; 2658 rcu_read_unlock(); 2659 } 2660 2661 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2662 { 2663 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2664 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2665 2666 seq_printf(seq, 2667 "%-4d %-15s %pi6 %5d %08X %ld\n", 2668 state->dev->ifindex, state->dev->name, 2669 &im->mca_addr, 2670 im->mca_users, im->mca_flags, 2671 (im->mca_flags&MAF_TIMER_RUNNING) ? 2672 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2673 return 0; 2674 } 2675 2676 static const struct seq_operations igmp6_mc_seq_ops = { 2677 .start = igmp6_mc_seq_start, 2678 .next = igmp6_mc_seq_next, 2679 .stop = igmp6_mc_seq_stop, 2680 .show = igmp6_mc_seq_show, 2681 }; 2682 2683 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2684 { 2685 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2686 sizeof(struct igmp6_mc_iter_state)); 2687 } 2688 2689 static const struct file_operations igmp6_mc_seq_fops = { 2690 .owner = THIS_MODULE, 2691 .open = igmp6_mc_seq_open, 2692 .read = seq_read, 2693 .llseek = seq_lseek, 2694 .release = seq_release_net, 2695 }; 2696 2697 struct igmp6_mcf_iter_state { 2698 struct seq_net_private p; 2699 struct net_device *dev; 2700 struct inet6_dev *idev; 2701 struct ifmcaddr6 *im; 2702 }; 2703 2704 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2705 2706 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2707 { 2708 struct ip6_sf_list *psf = NULL; 2709 struct ifmcaddr6 *im = NULL; 2710 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2711 struct net *net = seq_file_net(seq); 2712 2713 state->idev = NULL; 2714 state->im = NULL; 2715 for_each_netdev_rcu(net, state->dev) { 2716 struct inet6_dev *idev; 2717 idev = __in6_dev_get(state->dev); 2718 if (unlikely(idev == NULL)) 2719 continue; 2720 read_lock_bh(&idev->lock); 2721 im = idev->mc_list; 2722 if (likely(im != NULL)) { 2723 spin_lock_bh(&im->mca_lock); 2724 psf = im->mca_sources; 2725 if (likely(psf != NULL)) { 2726 state->im = im; 2727 state->idev = idev; 2728 break; 2729 } 2730 spin_unlock_bh(&im->mca_lock); 2731 } 2732 read_unlock_bh(&idev->lock); 2733 } 2734 return psf; 2735 } 2736 2737 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2738 { 2739 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2740 2741 psf = psf->sf_next; 2742 while (!psf) { 2743 spin_unlock_bh(&state->im->mca_lock); 2744 state->im = state->im->next; 2745 while (!state->im) { 2746 if (likely(state->idev != NULL)) 2747 read_unlock_bh(&state->idev->lock); 2748 2749 state->dev = next_net_device_rcu(state->dev); 2750 if (!state->dev) { 2751 state->idev = NULL; 2752 goto out; 2753 } 2754 state->idev = __in6_dev_get(state->dev); 2755 if (!state->idev) 2756 continue; 2757 read_lock_bh(&state->idev->lock); 2758 state->im = state->idev->mc_list; 2759 } 2760 if (!state->im) 2761 break; 2762 spin_lock_bh(&state->im->mca_lock); 2763 psf = state->im->mca_sources; 2764 } 2765 out: 2766 return psf; 2767 } 2768 2769 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2770 { 2771 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2772 if (psf) 2773 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2774 --pos; 2775 return pos ? NULL : psf; 2776 } 2777 2778 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2779 __acquires(RCU) 2780 { 2781 rcu_read_lock(); 2782 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2783 } 2784 2785 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2786 { 2787 struct ip6_sf_list *psf; 2788 if (v == SEQ_START_TOKEN) 2789 psf = igmp6_mcf_get_first(seq); 2790 else 2791 psf = igmp6_mcf_get_next(seq, v); 2792 ++*pos; 2793 return psf; 2794 } 2795 2796 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2797 __releases(RCU) 2798 { 2799 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2800 if (likely(state->im != NULL)) { 2801 spin_unlock_bh(&state->im->mca_lock); 2802 state->im = NULL; 2803 } 2804 if (likely(state->idev != NULL)) { 2805 read_unlock_bh(&state->idev->lock); 2806 state->idev = NULL; 2807 } 2808 state->dev = NULL; 2809 rcu_read_unlock(); 2810 } 2811 2812 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2813 { 2814 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2815 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2816 2817 if (v == SEQ_START_TOKEN) { 2818 seq_printf(seq, 2819 "%3s %6s " 2820 "%32s %32s %6s %6s\n", "Idx", 2821 "Device", "Multicast Address", 2822 "Source Address", "INC", "EXC"); 2823 } else { 2824 seq_printf(seq, 2825 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2826 state->dev->ifindex, state->dev->name, 2827 &state->im->mca_addr, 2828 &psf->sf_addr, 2829 psf->sf_count[MCAST_INCLUDE], 2830 psf->sf_count[MCAST_EXCLUDE]); 2831 } 2832 return 0; 2833 } 2834 2835 static const struct seq_operations igmp6_mcf_seq_ops = { 2836 .start = igmp6_mcf_seq_start, 2837 .next = igmp6_mcf_seq_next, 2838 .stop = igmp6_mcf_seq_stop, 2839 .show = igmp6_mcf_seq_show, 2840 }; 2841 2842 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2843 { 2844 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2845 sizeof(struct igmp6_mcf_iter_state)); 2846 } 2847 2848 static const struct file_operations igmp6_mcf_seq_fops = { 2849 .owner = THIS_MODULE, 2850 .open = igmp6_mcf_seq_open, 2851 .read = seq_read, 2852 .llseek = seq_lseek, 2853 .release = seq_release_net, 2854 }; 2855 2856 static int __net_init igmp6_proc_init(struct net *net) 2857 { 2858 int err; 2859 2860 err = -ENOMEM; 2861 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) 2862 goto out; 2863 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, 2864 &igmp6_mcf_seq_fops)) 2865 goto out_proc_net_igmp6; 2866 2867 err = 0; 2868 out: 2869 return err; 2870 2871 out_proc_net_igmp6: 2872 remove_proc_entry("igmp6", net->proc_net); 2873 goto out; 2874 } 2875 2876 static void __net_exit igmp6_proc_exit(struct net *net) 2877 { 2878 remove_proc_entry("mcfilter6", net->proc_net); 2879 remove_proc_entry("igmp6", net->proc_net); 2880 } 2881 #else 2882 static inline int igmp6_proc_init(struct net *net) 2883 { 2884 return 0; 2885 } 2886 static inline void igmp6_proc_exit(struct net *net) 2887 { 2888 } 2889 #endif 2890 2891 static int __net_init igmp6_net_init(struct net *net) 2892 { 2893 int err; 2894 2895 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2896 SOCK_RAW, IPPROTO_ICMPV6, net); 2897 if (err < 0) { 2898 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2899 err); 2900 goto out; 2901 } 2902 2903 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2904 2905 err = igmp6_proc_init(net); 2906 if (err) 2907 goto out_sock_create; 2908 out: 2909 return err; 2910 2911 out_sock_create: 2912 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2913 goto out; 2914 } 2915 2916 static void __net_exit igmp6_net_exit(struct net *net) 2917 { 2918 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2919 igmp6_proc_exit(net); 2920 } 2921 2922 static struct pernet_operations igmp6_net_ops = { 2923 .init = igmp6_net_init, 2924 .exit = igmp6_net_exit, 2925 }; 2926 2927 int __init igmp6_init(void) 2928 { 2929 return register_pernet_subsys(&igmp6_net_ops); 2930 } 2931 2932 void igmp6_cleanup(void) 2933 { 2934 unregister_pernet_subsys(&igmp6_net_ops); 2935 } 2936