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 <net/mld.h> 48 49 #include <linux/netfilter.h> 50 #include <linux/netfilter_ipv6.h> 51 52 #include <net/net_namespace.h> 53 #include <net/sock.h> 54 #include <net/snmp.h> 55 56 #include <net/ipv6.h> 57 #include <net/protocol.h> 58 #include <net/if_inet6.h> 59 #include <net/ndisc.h> 60 #include <net/addrconf.h> 61 #include <net/ip6_route.h> 62 #include <net/inet_common.h> 63 64 #include <net/ip6_checksum.h> 65 66 /* Set to 3 to get tracing... */ 67 #define MCAST_DEBUG 2 68 69 #if MCAST_DEBUG >= 3 70 #define MDBG(x) printk x 71 #else 72 #define MDBG(x) 73 #endif 74 75 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = { 77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4), 78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4), 79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4) 80 }; 81 82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 83 84 /* Big mc list lock for all the sockets */ 85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock); 86 87 static void igmp6_join_group(struct ifmcaddr6 *ma); 88 static void igmp6_leave_group(struct ifmcaddr6 *ma); 89 static void igmp6_timer_handler(unsigned long data); 90 91 static void mld_gq_timer_expire(unsigned long data); 92 static void mld_ifc_timer_expire(unsigned long data); 93 static void mld_ifc_event(struct inet6_dev *idev); 94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 95 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 96 static void mld_clear_delrec(struct inet6_dev *idev); 97 static int sf_setstate(struct ifmcaddr6 *pmc); 98 static void sf_markstate(struct ifmcaddr6 *pmc); 99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 100 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 101 int sfmode, int sfcount, struct in6_addr *psfsrc, 102 int delta); 103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 104 int sfmode, int sfcount, struct in6_addr *psfsrc, 105 int delta); 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 107 struct inet6_dev *idev); 108 109 110 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 111 #define MLD_QRV_DEFAULT 2 112 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \ 114 (idev)->cnf.force_mld_version == 1 || \ 115 ((idev)->mc_v1_seen && \ 116 time_before(jiffies, (idev)->mc_v1_seen))) 117 118 #define IPV6_MLD_MAX_MSF 64 119 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 121 122 /* 123 * socket join on multicast group 124 */ 125 126 #define for_each_pmc_rcu(np, pmc) \ 127 for (pmc = rcu_dereference(np->ipv6_mc_list); \ 128 pmc != NULL; \ 129 pmc = rcu_dereference(pmc->next)) 130 131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 132 { 133 struct net_device *dev = NULL; 134 struct ipv6_mc_socklist *mc_lst; 135 struct ipv6_pinfo *np = inet6_sk(sk); 136 struct net *net = sock_net(sk); 137 int err; 138 139 if (!ipv6_addr_is_multicast(addr)) 140 return -EINVAL; 141 142 rcu_read_lock(); 143 for_each_pmc_rcu(np, mc_lst) { 144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 145 ipv6_addr_equal(&mc_lst->addr, addr)) { 146 rcu_read_unlock(); 147 return -EADDRINUSE; 148 } 149 } 150 rcu_read_unlock(); 151 152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 153 154 if (mc_lst == NULL) 155 return -ENOMEM; 156 157 mc_lst->next = NULL; 158 ipv6_addr_copy(&mc_lst->addr, addr); 159 160 rcu_read_lock(); 161 if (ifindex == 0) { 162 struct rt6_info *rt; 163 rt = rt6_lookup(net, addr, NULL, 0, 0); 164 if (rt) { 165 dev = rt->rt6i_dev; 166 dst_release(&rt->dst); 167 } 168 } else 169 dev = dev_get_by_index_rcu(net, ifindex); 170 171 if (dev == NULL) { 172 rcu_read_unlock(); 173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 174 return -ENODEV; 175 } 176 177 mc_lst->ifindex = dev->ifindex; 178 mc_lst->sfmode = MCAST_EXCLUDE; 179 rwlock_init(&mc_lst->sflock); 180 mc_lst->sflist = NULL; 181 182 /* 183 * now add/increase the group membership on the device 184 */ 185 186 err = ipv6_dev_mc_inc(dev, addr); 187 188 if (err) { 189 rcu_read_unlock(); 190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 191 return err; 192 } 193 194 spin_lock(&ipv6_sk_mc_lock); 195 mc_lst->next = np->ipv6_mc_list; 196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 197 spin_unlock(&ipv6_sk_mc_lock); 198 199 rcu_read_unlock(); 200 201 return 0; 202 } 203 204 static void ipv6_mc_socklist_reclaim(struct rcu_head *head) 205 { 206 kfree(container_of(head, struct ipv6_mc_socklist, rcu)); 207 } 208 /* 209 * socket leave on multicast group 210 */ 211 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 212 { 213 struct ipv6_pinfo *np = inet6_sk(sk); 214 struct ipv6_mc_socklist *mc_lst; 215 struct ipv6_mc_socklist __rcu **lnk; 216 struct net *net = sock_net(sk); 217 218 spin_lock(&ipv6_sk_mc_lock); 219 for (lnk = &np->ipv6_mc_list; 220 (mc_lst = rcu_dereference_protected(*lnk, 221 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ; 222 lnk = &mc_lst->next) { 223 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 224 ipv6_addr_equal(&mc_lst->addr, addr)) { 225 struct net_device *dev; 226 227 *lnk = mc_lst->next; 228 spin_unlock(&ipv6_sk_mc_lock); 229 230 rcu_read_lock(); 231 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 232 if (dev != NULL) { 233 struct inet6_dev *idev = __in6_dev_get(dev); 234 235 (void) ip6_mc_leave_src(sk, mc_lst, idev); 236 if (idev) 237 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 238 } else 239 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 240 rcu_read_unlock(); 241 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 242 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim); 243 return 0; 244 } 245 } 246 spin_unlock(&ipv6_sk_mc_lock); 247 248 return -EADDRNOTAVAIL; 249 } 250 251 /* called with rcu_read_lock() */ 252 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 253 struct in6_addr *group, 254 int ifindex) 255 { 256 struct net_device *dev = NULL; 257 struct inet6_dev *idev = NULL; 258 259 if (ifindex == 0) { 260 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); 261 262 if (rt) { 263 dev = rt->rt6i_dev; 264 dev_hold(dev); 265 dst_release(&rt->dst); 266 } 267 } else 268 dev = dev_get_by_index_rcu(net, ifindex); 269 270 if (!dev) 271 return NULL; 272 idev = __in6_dev_get(dev); 273 if (!idev) 274 return NULL; 275 read_lock_bh(&idev->lock); 276 if (idev->dead) { 277 read_unlock_bh(&idev->lock); 278 return NULL; 279 } 280 return idev; 281 } 282 283 void ipv6_sock_mc_close(struct sock *sk) 284 { 285 struct ipv6_pinfo *np = inet6_sk(sk); 286 struct ipv6_mc_socklist *mc_lst; 287 struct net *net = sock_net(sk); 288 289 spin_lock(&ipv6_sk_mc_lock); 290 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list, 291 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) { 292 struct net_device *dev; 293 294 np->ipv6_mc_list = mc_lst->next; 295 spin_unlock(&ipv6_sk_mc_lock); 296 297 rcu_read_lock(); 298 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 299 if (dev) { 300 struct inet6_dev *idev = __in6_dev_get(dev); 301 302 (void) ip6_mc_leave_src(sk, mc_lst, idev); 303 if (idev) 304 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 305 } else 306 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 307 rcu_read_unlock(); 308 309 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 310 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim); 311 312 spin_lock(&ipv6_sk_mc_lock); 313 } 314 spin_unlock(&ipv6_sk_mc_lock); 315 } 316 317 int ip6_mc_source(int add, int omode, struct sock *sk, 318 struct group_source_req *pgsr) 319 { 320 struct in6_addr *source, *group; 321 struct ipv6_mc_socklist *pmc; 322 struct inet6_dev *idev; 323 struct ipv6_pinfo *inet6 = inet6_sk(sk); 324 struct ip6_sf_socklist *psl; 325 struct net *net = sock_net(sk); 326 int i, j, rv; 327 int leavegroup = 0; 328 int pmclocked = 0; 329 int err; 330 331 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 332 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 333 334 if (!ipv6_addr_is_multicast(group)) 335 return -EINVAL; 336 337 rcu_read_lock(); 338 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 339 if (!idev) { 340 rcu_read_unlock(); 341 return -ENODEV; 342 } 343 344 err = -EADDRNOTAVAIL; 345 346 for_each_pmc_rcu(inet6, pmc) { 347 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 348 continue; 349 if (ipv6_addr_equal(&pmc->addr, group)) 350 break; 351 } 352 if (!pmc) { /* must have a prior join */ 353 err = -EINVAL; 354 goto done; 355 } 356 /* if a source filter was set, must be the same mode as before */ 357 if (pmc->sflist) { 358 if (pmc->sfmode != omode) { 359 err = -EINVAL; 360 goto done; 361 } 362 } else if (pmc->sfmode != omode) { 363 /* allow mode switches for empty-set filters */ 364 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 365 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 366 pmc->sfmode = omode; 367 } 368 369 write_lock(&pmc->sflock); 370 pmclocked = 1; 371 372 psl = pmc->sflist; 373 if (!add) { 374 if (!psl) 375 goto done; /* err = -EADDRNOTAVAIL */ 376 rv = !0; 377 for (i=0; i<psl->sl_count; i++) { 378 rv = memcmp(&psl->sl_addr[i], source, 379 sizeof(struct in6_addr)); 380 if (rv == 0) 381 break; 382 } 383 if (rv) /* source not found */ 384 goto done; /* err = -EADDRNOTAVAIL */ 385 386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 388 leavegroup = 1; 389 goto done; 390 } 391 392 /* update the interface filter */ 393 ip6_mc_del_src(idev, group, omode, 1, source, 1); 394 395 for (j=i+1; j<psl->sl_count; j++) 396 psl->sl_addr[j-1] = psl->sl_addr[j]; 397 psl->sl_count--; 398 err = 0; 399 goto done; 400 } 401 /* else, add a new source to the filter */ 402 403 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 404 err = -ENOBUFS; 405 goto done; 406 } 407 if (!psl || psl->sl_count == psl->sl_max) { 408 struct ip6_sf_socklist *newpsl; 409 int count = IP6_SFBLOCK; 410 411 if (psl) 412 count += psl->sl_max; 413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 414 if (!newpsl) { 415 err = -ENOBUFS; 416 goto done; 417 } 418 newpsl->sl_max = count; 419 newpsl->sl_count = count - IP6_SFBLOCK; 420 if (psl) { 421 for (i=0; i<psl->sl_count; i++) 422 newpsl->sl_addr[i] = psl->sl_addr[i]; 423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 424 } 425 pmc->sflist = psl = newpsl; 426 } 427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 428 for (i=0; i<psl->sl_count; i++) { 429 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 430 if (rv == 0) 431 break; 432 } 433 if (rv == 0) /* address already there is an error */ 434 goto done; 435 for (j=psl->sl_count-1; j>=i; j--) 436 psl->sl_addr[j+1] = psl->sl_addr[j]; 437 psl->sl_addr[i] = *source; 438 psl->sl_count++; 439 err = 0; 440 /* update the interface list */ 441 ip6_mc_add_src(idev, group, omode, 1, source, 1); 442 done: 443 if (pmclocked) 444 write_unlock(&pmc->sflock); 445 read_unlock_bh(&idev->lock); 446 rcu_read_unlock(); 447 if (leavegroup) 448 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 449 return err; 450 } 451 452 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 453 { 454 struct in6_addr *group; 455 struct ipv6_mc_socklist *pmc; 456 struct inet6_dev *idev; 457 struct ipv6_pinfo *inet6 = inet6_sk(sk); 458 struct ip6_sf_socklist *newpsl, *psl; 459 struct net *net = sock_net(sk); 460 int leavegroup = 0; 461 int i, err; 462 463 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 464 465 if (!ipv6_addr_is_multicast(group)) 466 return -EINVAL; 467 if (gsf->gf_fmode != MCAST_INCLUDE && 468 gsf->gf_fmode != MCAST_EXCLUDE) 469 return -EINVAL; 470 471 rcu_read_lock(); 472 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 473 474 if (!idev) { 475 rcu_read_unlock(); 476 return -ENODEV; 477 } 478 479 err = 0; 480 481 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 482 leavegroup = 1; 483 goto done; 484 } 485 486 for_each_pmc_rcu(inet6, pmc) { 487 if (pmc->ifindex != gsf->gf_interface) 488 continue; 489 if (ipv6_addr_equal(&pmc->addr, group)) 490 break; 491 } 492 if (!pmc) { /* must have a prior join */ 493 err = -EINVAL; 494 goto done; 495 } 496 if (gsf->gf_numsrc) { 497 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 498 GFP_ATOMIC); 499 if (!newpsl) { 500 err = -ENOBUFS; 501 goto done; 502 } 503 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 504 for (i=0; i<newpsl->sl_count; ++i) { 505 struct sockaddr_in6 *psin6; 506 507 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 508 newpsl->sl_addr[i] = psin6->sin6_addr; 509 } 510 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 511 newpsl->sl_count, newpsl->sl_addr, 0); 512 if (err) { 513 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 514 goto done; 515 } 516 } else { 517 newpsl = NULL; 518 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 519 } 520 521 write_lock(&pmc->sflock); 522 psl = pmc->sflist; 523 if (psl) { 524 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 525 psl->sl_count, psl->sl_addr, 0); 526 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 527 } else 528 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 529 pmc->sflist = newpsl; 530 pmc->sfmode = gsf->gf_fmode; 531 write_unlock(&pmc->sflock); 532 err = 0; 533 done: 534 read_unlock_bh(&idev->lock); 535 rcu_read_unlock(); 536 if (leavegroup) 537 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 538 return err; 539 } 540 541 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 542 struct group_filter __user *optval, int __user *optlen) 543 { 544 int err, i, count, copycount; 545 struct in6_addr *group; 546 struct ipv6_mc_socklist *pmc; 547 struct inet6_dev *idev; 548 struct ipv6_pinfo *inet6 = inet6_sk(sk); 549 struct ip6_sf_socklist *psl; 550 struct net *net = sock_net(sk); 551 552 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 553 554 if (!ipv6_addr_is_multicast(group)) 555 return -EINVAL; 556 557 rcu_read_lock(); 558 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 559 560 if (!idev) { 561 rcu_read_unlock(); 562 return -ENODEV; 563 } 564 565 err = -EADDRNOTAVAIL; 566 /* 567 * changes to the ipv6_mc_list require the socket lock and 568 * a read lock on ip6_sk_mc_lock. We have the socket lock, 569 * so reading the list is safe. 570 */ 571 572 for_each_pmc_rcu(inet6, pmc) { 573 if (pmc->ifindex != gsf->gf_interface) 574 continue; 575 if (ipv6_addr_equal(group, &pmc->addr)) 576 break; 577 } 578 if (!pmc) /* must have a prior join */ 579 goto done; 580 gsf->gf_fmode = pmc->sfmode; 581 psl = pmc->sflist; 582 count = psl ? psl->sl_count : 0; 583 read_unlock_bh(&idev->lock); 584 rcu_read_unlock(); 585 586 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 587 gsf->gf_numsrc = count; 588 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 589 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 590 return -EFAULT; 591 } 592 /* changes to psl require the socket lock, a read lock on 593 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 594 * have the socket lock, so reading here is safe. 595 */ 596 for (i=0; i<copycount; i++) { 597 struct sockaddr_in6 *psin6; 598 struct sockaddr_storage ss; 599 600 psin6 = (struct sockaddr_in6 *)&ss; 601 memset(&ss, 0, sizeof(ss)); 602 psin6->sin6_family = AF_INET6; 603 psin6->sin6_addr = psl->sl_addr[i]; 604 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 605 return -EFAULT; 606 } 607 return 0; 608 done: 609 read_unlock_bh(&idev->lock); 610 rcu_read_unlock(); 611 return err; 612 } 613 614 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 615 const struct in6_addr *src_addr) 616 { 617 struct ipv6_pinfo *np = inet6_sk(sk); 618 struct ipv6_mc_socklist *mc; 619 struct ip6_sf_socklist *psl; 620 int rv = 1; 621 622 rcu_read_lock(); 623 for_each_pmc_rcu(np, mc) { 624 if (ipv6_addr_equal(&mc->addr, mc_addr)) 625 break; 626 } 627 if (!mc) { 628 rcu_read_unlock(); 629 return 1; 630 } 631 read_lock(&mc->sflock); 632 psl = mc->sflist; 633 if (!psl) { 634 rv = mc->sfmode == MCAST_EXCLUDE; 635 } else { 636 int i; 637 638 for (i=0; i<psl->sl_count; i++) { 639 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 640 break; 641 } 642 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 643 rv = 0; 644 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 645 rv = 0; 646 } 647 read_unlock(&mc->sflock); 648 rcu_read_unlock(); 649 650 return rv; 651 } 652 653 static void ma_put(struct ifmcaddr6 *mc) 654 { 655 if (atomic_dec_and_test(&mc->mca_refcnt)) { 656 in6_dev_put(mc->idev); 657 kfree(mc); 658 } 659 } 660 661 static void igmp6_group_added(struct ifmcaddr6 *mc) 662 { 663 struct net_device *dev = mc->idev->dev; 664 char buf[MAX_ADDR_LEN]; 665 666 spin_lock_bh(&mc->mca_lock); 667 if (!(mc->mca_flags&MAF_LOADED)) { 668 mc->mca_flags |= MAF_LOADED; 669 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 670 dev_mc_add(dev, buf); 671 } 672 spin_unlock_bh(&mc->mca_lock); 673 674 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 675 return; 676 677 if (MLD_V1_SEEN(mc->idev)) { 678 igmp6_join_group(mc); 679 return; 680 } 681 /* else v2 */ 682 683 mc->mca_crcount = mc->idev->mc_qrv; 684 mld_ifc_event(mc->idev); 685 } 686 687 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 688 { 689 struct net_device *dev = mc->idev->dev; 690 char buf[MAX_ADDR_LEN]; 691 692 spin_lock_bh(&mc->mca_lock); 693 if (mc->mca_flags&MAF_LOADED) { 694 mc->mca_flags &= ~MAF_LOADED; 695 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 696 dev_mc_del(dev, buf); 697 } 698 699 if (mc->mca_flags & MAF_NOREPORT) 700 goto done; 701 spin_unlock_bh(&mc->mca_lock); 702 703 if (!mc->idev->dead) 704 igmp6_leave_group(mc); 705 706 spin_lock_bh(&mc->mca_lock); 707 if (del_timer(&mc->mca_timer)) 708 atomic_dec(&mc->mca_refcnt); 709 done: 710 ip6_mc_clear_src(mc); 711 spin_unlock_bh(&mc->mca_lock); 712 } 713 714 /* 715 * deleted ifmcaddr6 manipulation 716 */ 717 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 718 { 719 struct ifmcaddr6 *pmc; 720 721 /* this is an "ifmcaddr6" for convenience; only the fields below 722 * are actually used. In particular, the refcnt and users are not 723 * used for management of the delete list. Using the same structure 724 * for deleted items allows change reports to use common code with 725 * non-deleted or query-response MCA's. 726 */ 727 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 728 if (!pmc) 729 return; 730 731 spin_lock_bh(&im->mca_lock); 732 spin_lock_init(&pmc->mca_lock); 733 pmc->idev = im->idev; 734 in6_dev_hold(idev); 735 pmc->mca_addr = im->mca_addr; 736 pmc->mca_crcount = idev->mc_qrv; 737 pmc->mca_sfmode = im->mca_sfmode; 738 if (pmc->mca_sfmode == MCAST_INCLUDE) { 739 struct ip6_sf_list *psf; 740 741 pmc->mca_tomb = im->mca_tomb; 742 pmc->mca_sources = im->mca_sources; 743 im->mca_tomb = im->mca_sources = NULL; 744 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 745 psf->sf_crcount = pmc->mca_crcount; 746 } 747 spin_unlock_bh(&im->mca_lock); 748 749 spin_lock_bh(&idev->mc_lock); 750 pmc->next = idev->mc_tomb; 751 idev->mc_tomb = pmc; 752 spin_unlock_bh(&idev->mc_lock); 753 } 754 755 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 756 { 757 struct ifmcaddr6 *pmc, *pmc_prev; 758 struct ip6_sf_list *psf, *psf_next; 759 760 spin_lock_bh(&idev->mc_lock); 761 pmc_prev = NULL; 762 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 763 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 764 break; 765 pmc_prev = pmc; 766 } 767 if (pmc) { 768 if (pmc_prev) 769 pmc_prev->next = pmc->next; 770 else 771 idev->mc_tomb = pmc->next; 772 } 773 spin_unlock_bh(&idev->mc_lock); 774 775 if (pmc) { 776 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 777 psf_next = psf->sf_next; 778 kfree(psf); 779 } 780 in6_dev_put(pmc->idev); 781 kfree(pmc); 782 } 783 } 784 785 static void mld_clear_delrec(struct inet6_dev *idev) 786 { 787 struct ifmcaddr6 *pmc, *nextpmc; 788 789 spin_lock_bh(&idev->mc_lock); 790 pmc = idev->mc_tomb; 791 idev->mc_tomb = NULL; 792 spin_unlock_bh(&idev->mc_lock); 793 794 for (; pmc; pmc = nextpmc) { 795 nextpmc = pmc->next; 796 ip6_mc_clear_src(pmc); 797 in6_dev_put(pmc->idev); 798 kfree(pmc); 799 } 800 801 /* clear dead sources, too */ 802 read_lock_bh(&idev->lock); 803 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 804 struct ip6_sf_list *psf, *psf_next; 805 806 spin_lock_bh(&pmc->mca_lock); 807 psf = pmc->mca_tomb; 808 pmc->mca_tomb = NULL; 809 spin_unlock_bh(&pmc->mca_lock); 810 for (; psf; psf=psf_next) { 811 psf_next = psf->sf_next; 812 kfree(psf); 813 } 814 } 815 read_unlock_bh(&idev->lock); 816 } 817 818 819 /* 820 * device multicast group inc (add if not found) 821 */ 822 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 823 { 824 struct ifmcaddr6 *mc; 825 struct inet6_dev *idev; 826 827 /* we need to take a reference on idev */ 828 idev = in6_dev_get(dev); 829 830 if (idev == NULL) 831 return -EINVAL; 832 833 write_lock_bh(&idev->lock); 834 if (idev->dead) { 835 write_unlock_bh(&idev->lock); 836 in6_dev_put(idev); 837 return -ENODEV; 838 } 839 840 for (mc = idev->mc_list; mc; mc = mc->next) { 841 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 842 mc->mca_users++; 843 write_unlock_bh(&idev->lock); 844 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 845 NULL, 0); 846 in6_dev_put(idev); 847 return 0; 848 } 849 } 850 851 /* 852 * not found: create a new one. 853 */ 854 855 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 856 857 if (mc == NULL) { 858 write_unlock_bh(&idev->lock); 859 in6_dev_put(idev); 860 return -ENOMEM; 861 } 862 863 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 864 865 ipv6_addr_copy(&mc->mca_addr, addr); 866 mc->idev = idev; /* (reference taken) */ 867 mc->mca_users = 1; 868 /* mca_stamp should be updated upon changes */ 869 mc->mca_cstamp = mc->mca_tstamp = jiffies; 870 atomic_set(&mc->mca_refcnt, 2); 871 spin_lock_init(&mc->mca_lock); 872 873 /* initial mode is (EX, empty) */ 874 mc->mca_sfmode = MCAST_EXCLUDE; 875 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 876 877 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 878 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 879 mc->mca_flags |= MAF_NOREPORT; 880 881 mc->next = idev->mc_list; 882 idev->mc_list = mc; 883 write_unlock_bh(&idev->lock); 884 885 mld_del_delrec(idev, &mc->mca_addr); 886 igmp6_group_added(mc); 887 ma_put(mc); 888 return 0; 889 } 890 891 /* 892 * device multicast group del 893 */ 894 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 895 { 896 struct ifmcaddr6 *ma, **map; 897 898 write_lock_bh(&idev->lock); 899 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 900 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 901 if (--ma->mca_users == 0) { 902 *map = ma->next; 903 write_unlock_bh(&idev->lock); 904 905 igmp6_group_dropped(ma); 906 907 ma_put(ma); 908 return 0; 909 } 910 write_unlock_bh(&idev->lock); 911 return 0; 912 } 913 } 914 write_unlock_bh(&idev->lock); 915 916 return -ENOENT; 917 } 918 919 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 920 { 921 struct inet6_dev *idev; 922 int err; 923 924 rcu_read_lock(); 925 926 idev = __in6_dev_get(dev); 927 if (!idev) 928 err = -ENODEV; 929 else 930 err = __ipv6_dev_mc_dec(idev, addr); 931 932 rcu_read_unlock(); 933 return err; 934 } 935 936 /* 937 * identify MLD packets for MLD filter exceptions 938 */ 939 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 940 { 941 struct icmp6hdr *pic; 942 943 if (nexthdr != IPPROTO_ICMPV6) 944 return 0; 945 946 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 947 return 0; 948 949 pic = icmp6_hdr(skb); 950 951 switch (pic->icmp6_type) { 952 case ICMPV6_MGM_QUERY: 953 case ICMPV6_MGM_REPORT: 954 case ICMPV6_MGM_REDUCTION: 955 case ICMPV6_MLD2_REPORT: 956 return 1; 957 default: 958 break; 959 } 960 return 0; 961 } 962 963 /* 964 * check if the interface/address pair is valid 965 */ 966 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 967 const struct in6_addr *src_addr) 968 { 969 struct inet6_dev *idev; 970 struct ifmcaddr6 *mc; 971 int rv = 0; 972 973 rcu_read_lock(); 974 idev = __in6_dev_get(dev); 975 if (idev) { 976 read_lock_bh(&idev->lock); 977 for (mc = idev->mc_list; mc; mc=mc->next) { 978 if (ipv6_addr_equal(&mc->mca_addr, group)) 979 break; 980 } 981 if (mc) { 982 if (src_addr && !ipv6_addr_any(src_addr)) { 983 struct ip6_sf_list *psf; 984 985 spin_lock_bh(&mc->mca_lock); 986 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 987 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 988 break; 989 } 990 if (psf) 991 rv = psf->sf_count[MCAST_INCLUDE] || 992 psf->sf_count[MCAST_EXCLUDE] != 993 mc->mca_sfcount[MCAST_EXCLUDE]; 994 else 995 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 996 spin_unlock_bh(&mc->mca_lock); 997 } else 998 rv = 1; /* don't filter unspecified source */ 999 } 1000 read_unlock_bh(&idev->lock); 1001 } 1002 rcu_read_unlock(); 1003 return rv; 1004 } 1005 1006 static void mld_gq_start_timer(struct inet6_dev *idev) 1007 { 1008 int tv = net_random() % idev->mc_maxdelay; 1009 1010 idev->mc_gq_running = 1; 1011 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1012 in6_dev_hold(idev); 1013 } 1014 1015 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1016 { 1017 int tv = net_random() % delay; 1018 1019 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1020 in6_dev_hold(idev); 1021 } 1022 1023 /* 1024 * IGMP handling (alias multicast ICMPv6 messages) 1025 */ 1026 1027 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1028 { 1029 unsigned long delay = resptime; 1030 1031 /* Do not start timer for these addresses */ 1032 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1033 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1034 return; 1035 1036 if (del_timer(&ma->mca_timer)) { 1037 atomic_dec(&ma->mca_refcnt); 1038 delay = ma->mca_timer.expires - jiffies; 1039 } 1040 1041 if (delay >= resptime) { 1042 if (resptime) 1043 delay = net_random() % resptime; 1044 else 1045 delay = 1; 1046 } 1047 ma->mca_timer.expires = jiffies + delay; 1048 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1049 atomic_inc(&ma->mca_refcnt); 1050 ma->mca_flags |= MAF_TIMER_RUNNING; 1051 } 1052 1053 /* mark EXCLUDE-mode sources */ 1054 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1055 struct in6_addr *srcs) 1056 { 1057 struct ip6_sf_list *psf; 1058 int i, scount; 1059 1060 scount = 0; 1061 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1062 if (scount == nsrcs) 1063 break; 1064 for (i=0; i<nsrcs; i++) { 1065 /* skip inactive filters */ 1066 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1067 pmc->mca_sfcount[MCAST_EXCLUDE] != 1068 psf->sf_count[MCAST_EXCLUDE]) 1069 continue; 1070 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1071 scount++; 1072 break; 1073 } 1074 } 1075 } 1076 pmc->mca_flags &= ~MAF_GSQUERY; 1077 if (scount == nsrcs) /* all sources excluded */ 1078 return 0; 1079 return 1; 1080 } 1081 1082 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1083 struct in6_addr *srcs) 1084 { 1085 struct ip6_sf_list *psf; 1086 int i, scount; 1087 1088 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1089 return mld_xmarksources(pmc, nsrcs, srcs); 1090 1091 /* mark INCLUDE-mode sources */ 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 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1099 psf->sf_gsresp = 1; 1100 scount++; 1101 break; 1102 } 1103 } 1104 } 1105 if (!scount) { 1106 pmc->mca_flags &= ~MAF_GSQUERY; 1107 return 0; 1108 } 1109 pmc->mca_flags |= MAF_GSQUERY; 1110 return 1; 1111 } 1112 1113 /* called with rcu_read_lock() */ 1114 int igmp6_event_query(struct sk_buff *skb) 1115 { 1116 struct mld2_query *mlh2 = NULL; 1117 struct ifmcaddr6 *ma; 1118 struct in6_addr *group; 1119 unsigned long max_delay; 1120 struct inet6_dev *idev; 1121 struct mld_msg *mld; 1122 int group_type; 1123 int mark = 0; 1124 int len; 1125 1126 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1127 return -EINVAL; 1128 1129 /* compute payload length excluding extension headers */ 1130 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1131 len -= skb_network_header_len(skb); 1132 1133 /* Drop queries with not link local source */ 1134 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1135 return -EINVAL; 1136 1137 idev = __in6_dev_get(skb->dev); 1138 1139 if (idev == NULL) 1140 return 0; 1141 1142 mld = (struct mld_msg *)icmp6_hdr(skb); 1143 group = &mld->mld_mca; 1144 group_type = ipv6_addr_type(group); 1145 1146 if (group_type != IPV6_ADDR_ANY && 1147 !(group_type&IPV6_ADDR_MULTICAST)) 1148 return -EINVAL; 1149 1150 if (len == 24) { 1151 int switchback; 1152 /* MLDv1 router present */ 1153 1154 /* Translate milliseconds to jiffies */ 1155 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000; 1156 1157 switchback = (idev->mc_qrv + 1) * max_delay; 1158 idev->mc_v1_seen = jiffies + switchback; 1159 1160 /* cancel the interface change timer */ 1161 idev->mc_ifc_count = 0; 1162 if (del_timer(&idev->mc_ifc_timer)) 1163 __in6_dev_put(idev); 1164 /* clear deleted report items */ 1165 mld_clear_delrec(idev); 1166 } else if (len >= 28) { 1167 int srcs_offset = sizeof(struct mld2_query) - 1168 sizeof(struct icmp6hdr); 1169 if (!pskb_may_pull(skb, srcs_offset)) 1170 return -EINVAL; 1171 1172 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1173 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000; 1174 if (!max_delay) 1175 max_delay = 1; 1176 idev->mc_maxdelay = max_delay; 1177 if (mlh2->mld2q_qrv) 1178 idev->mc_qrv = mlh2->mld2q_qrv; 1179 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1180 if (mlh2->mld2q_nsrcs) 1181 return -EINVAL; /* no sources allowed */ 1182 1183 mld_gq_start_timer(idev); 1184 return 0; 1185 } 1186 /* mark sources to include, if group & source-specific */ 1187 if (mlh2->mld2q_nsrcs != 0) { 1188 if (!pskb_may_pull(skb, srcs_offset + 1189 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1190 return -EINVAL; 1191 1192 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1193 mark = 1; 1194 } 1195 } else 1196 return -EINVAL; 1197 1198 read_lock_bh(&idev->lock); 1199 if (group_type == IPV6_ADDR_ANY) { 1200 for (ma = idev->mc_list; ma; ma=ma->next) { 1201 spin_lock_bh(&ma->mca_lock); 1202 igmp6_group_queried(ma, max_delay); 1203 spin_unlock_bh(&ma->mca_lock); 1204 } 1205 } else { 1206 for (ma = idev->mc_list; ma; ma=ma->next) { 1207 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1208 continue; 1209 spin_lock_bh(&ma->mca_lock); 1210 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1211 /* gsquery <- gsquery && mark */ 1212 if (!mark) 1213 ma->mca_flags &= ~MAF_GSQUERY; 1214 } else { 1215 /* gsquery <- mark */ 1216 if (mark) 1217 ma->mca_flags |= MAF_GSQUERY; 1218 else 1219 ma->mca_flags &= ~MAF_GSQUERY; 1220 } 1221 if (!(ma->mca_flags & MAF_GSQUERY) || 1222 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1223 igmp6_group_queried(ma, max_delay); 1224 spin_unlock_bh(&ma->mca_lock); 1225 break; 1226 } 1227 } 1228 read_unlock_bh(&idev->lock); 1229 1230 return 0; 1231 } 1232 1233 /* called with rcu_read_lock() */ 1234 int igmp6_event_report(struct sk_buff *skb) 1235 { 1236 struct ifmcaddr6 *ma; 1237 struct inet6_dev *idev; 1238 struct mld_msg *mld; 1239 int addr_type; 1240 1241 /* Our own report looped back. Ignore it. */ 1242 if (skb->pkt_type == PACKET_LOOPBACK) 1243 return 0; 1244 1245 /* send our report if the MC router may not have heard this report */ 1246 if (skb->pkt_type != PACKET_MULTICAST && 1247 skb->pkt_type != PACKET_BROADCAST) 1248 return 0; 1249 1250 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1251 return -EINVAL; 1252 1253 mld = (struct mld_msg *)icmp6_hdr(skb); 1254 1255 /* Drop reports with not link local source */ 1256 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1257 if (addr_type != IPV6_ADDR_ANY && 1258 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1259 return -EINVAL; 1260 1261 idev = __in6_dev_get(skb->dev); 1262 if (idev == NULL) 1263 return -ENODEV; 1264 1265 /* 1266 * Cancel the timer for this group 1267 */ 1268 1269 read_lock_bh(&idev->lock); 1270 for (ma = idev->mc_list; ma; ma=ma->next) { 1271 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1272 spin_lock(&ma->mca_lock); 1273 if (del_timer(&ma->mca_timer)) 1274 atomic_dec(&ma->mca_refcnt); 1275 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1276 spin_unlock(&ma->mca_lock); 1277 break; 1278 } 1279 } 1280 read_unlock_bh(&idev->lock); 1281 return 0; 1282 } 1283 1284 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1285 int gdeleted, int sdeleted) 1286 { 1287 switch (type) { 1288 case MLD2_MODE_IS_INCLUDE: 1289 case MLD2_MODE_IS_EXCLUDE: 1290 if (gdeleted || sdeleted) 1291 return 0; 1292 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1293 if (pmc->mca_sfmode == MCAST_INCLUDE) 1294 return 1; 1295 /* don't include if this source is excluded 1296 * in all filters 1297 */ 1298 if (psf->sf_count[MCAST_INCLUDE]) 1299 return type == MLD2_MODE_IS_INCLUDE; 1300 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1301 psf->sf_count[MCAST_EXCLUDE]; 1302 } 1303 return 0; 1304 case MLD2_CHANGE_TO_INCLUDE: 1305 if (gdeleted || sdeleted) 1306 return 0; 1307 return psf->sf_count[MCAST_INCLUDE] != 0; 1308 case MLD2_CHANGE_TO_EXCLUDE: 1309 if (gdeleted || sdeleted) 1310 return 0; 1311 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1312 psf->sf_count[MCAST_INCLUDE]) 1313 return 0; 1314 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1315 psf->sf_count[MCAST_EXCLUDE]; 1316 case MLD2_ALLOW_NEW_SOURCES: 1317 if (gdeleted || !psf->sf_crcount) 1318 return 0; 1319 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1320 case MLD2_BLOCK_OLD_SOURCES: 1321 if (pmc->mca_sfmode == MCAST_INCLUDE) 1322 return gdeleted || (psf->sf_crcount && sdeleted); 1323 return psf->sf_crcount && !gdeleted && !sdeleted; 1324 } 1325 return 0; 1326 } 1327 1328 static int 1329 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1330 { 1331 struct ip6_sf_list *psf; 1332 int scount = 0; 1333 1334 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1335 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1336 continue; 1337 scount++; 1338 } 1339 return scount; 1340 } 1341 1342 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1343 { 1344 struct net *net = dev_net(dev); 1345 struct sock *sk = net->ipv6.igmp_sk; 1346 struct sk_buff *skb; 1347 struct mld2_report *pmr; 1348 struct in6_addr addr_buf; 1349 const struct in6_addr *saddr; 1350 int err; 1351 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1352 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1353 IPV6_TLV_PADN, 0 }; 1354 1355 /* we assume size > sizeof(ra) here */ 1356 size += LL_ALLOCATED_SPACE(dev); 1357 /* limit our allocations to order-0 page */ 1358 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1359 skb = sock_alloc_send_skb(sk, size, 1, &err); 1360 1361 if (!skb) 1362 return NULL; 1363 1364 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1365 1366 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1367 /* <draft-ietf-magma-mld-source-05.txt>: 1368 * use unspecified address as the source address 1369 * when a valid link-local address is not available. 1370 */ 1371 saddr = &in6addr_any; 1372 } else 1373 saddr = &addr_buf; 1374 1375 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1376 1377 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1378 1379 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1380 skb_put(skb, sizeof(*pmr)); 1381 pmr = (struct mld2_report *)skb_transport_header(skb); 1382 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1383 pmr->mld2r_resv1 = 0; 1384 pmr->mld2r_cksum = 0; 1385 pmr->mld2r_resv2 = 0; 1386 pmr->mld2r_ngrec = 0; 1387 return skb; 1388 } 1389 1390 static void mld_sendpack(struct sk_buff *skb) 1391 { 1392 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1393 struct mld2_report *pmr = 1394 (struct mld2_report *)skb_transport_header(skb); 1395 int payload_len, mldlen; 1396 struct inet6_dev *idev; 1397 struct net *net = dev_net(skb->dev); 1398 int err; 1399 struct flowi6 fl6; 1400 struct dst_entry *dst; 1401 1402 rcu_read_lock(); 1403 idev = __in6_dev_get(skb->dev); 1404 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1405 1406 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1407 mldlen = skb->tail - skb->transport_header; 1408 pip6->payload_len = htons(payload_len); 1409 1410 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1411 IPPROTO_ICMPV6, 1412 csum_partial(skb_transport_header(skb), 1413 mldlen, 0)); 1414 1415 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1416 1417 if (!dst) { 1418 err = -ENOMEM; 1419 goto err_out; 1420 } 1421 1422 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1423 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1424 skb->dev->ifindex); 1425 1426 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); 1427 err = 0; 1428 if (IS_ERR(dst)) { 1429 err = PTR_ERR(dst); 1430 dst = NULL; 1431 } 1432 skb_dst_set(skb, dst); 1433 if (err) 1434 goto err_out; 1435 1436 payload_len = skb->len; 1437 1438 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1439 dst_output); 1440 out: 1441 if (!err) { 1442 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1443 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1444 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1445 } else 1446 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1447 1448 rcu_read_unlock(); 1449 return; 1450 1451 err_out: 1452 kfree_skb(skb); 1453 goto out; 1454 } 1455 1456 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1457 { 1458 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1459 } 1460 1461 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1462 int type, struct mld2_grec **ppgr) 1463 { 1464 struct net_device *dev = pmc->idev->dev; 1465 struct mld2_report *pmr; 1466 struct mld2_grec *pgr; 1467 1468 if (!skb) 1469 skb = mld_newpack(dev, dev->mtu); 1470 if (!skb) 1471 return NULL; 1472 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1473 pgr->grec_type = type; 1474 pgr->grec_auxwords = 0; 1475 pgr->grec_nsrcs = 0; 1476 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1477 pmr = (struct mld2_report *)skb_transport_header(skb); 1478 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1479 *ppgr = pgr; 1480 return skb; 1481 } 1482 1483 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1484 skb_tailroom(skb)) : 0) 1485 1486 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1487 int type, int gdeleted, int sdeleted) 1488 { 1489 struct net_device *dev = pmc->idev->dev; 1490 struct mld2_report *pmr; 1491 struct mld2_grec *pgr = NULL; 1492 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1493 int scount, stotal, first, isquery, truncate; 1494 1495 if (pmc->mca_flags & MAF_NOREPORT) 1496 return skb; 1497 1498 isquery = type == MLD2_MODE_IS_INCLUDE || 1499 type == MLD2_MODE_IS_EXCLUDE; 1500 truncate = type == MLD2_MODE_IS_EXCLUDE || 1501 type == MLD2_CHANGE_TO_EXCLUDE; 1502 1503 stotal = scount = 0; 1504 1505 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1506 1507 if (!*psf_list) 1508 goto empty_source; 1509 1510 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1511 1512 /* EX and TO_EX get a fresh packet, if needed */ 1513 if (truncate) { 1514 if (pmr && pmr->mld2r_ngrec && 1515 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1516 if (skb) 1517 mld_sendpack(skb); 1518 skb = mld_newpack(dev, dev->mtu); 1519 } 1520 } 1521 first = 1; 1522 psf_prev = NULL; 1523 for (psf=*psf_list; psf; psf=psf_next) { 1524 struct in6_addr *psrc; 1525 1526 psf_next = psf->sf_next; 1527 1528 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1529 psf_prev = psf; 1530 continue; 1531 } 1532 1533 /* clear marks on query responses */ 1534 if (isquery) 1535 psf->sf_gsresp = 0; 1536 1537 if (AVAILABLE(skb) < sizeof(*psrc) + 1538 first*sizeof(struct mld2_grec)) { 1539 if (truncate && !first) 1540 break; /* truncate these */ 1541 if (pgr) 1542 pgr->grec_nsrcs = htons(scount); 1543 if (skb) 1544 mld_sendpack(skb); 1545 skb = mld_newpack(dev, dev->mtu); 1546 first = 1; 1547 scount = 0; 1548 } 1549 if (first) { 1550 skb = add_grhead(skb, pmc, type, &pgr); 1551 first = 0; 1552 } 1553 if (!skb) 1554 return NULL; 1555 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1556 *psrc = psf->sf_addr; 1557 scount++; stotal++; 1558 if ((type == MLD2_ALLOW_NEW_SOURCES || 1559 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1560 psf->sf_crcount--; 1561 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1562 if (psf_prev) 1563 psf_prev->sf_next = psf->sf_next; 1564 else 1565 *psf_list = psf->sf_next; 1566 kfree(psf); 1567 continue; 1568 } 1569 } 1570 psf_prev = psf; 1571 } 1572 1573 empty_source: 1574 if (!stotal) { 1575 if (type == MLD2_ALLOW_NEW_SOURCES || 1576 type == MLD2_BLOCK_OLD_SOURCES) 1577 return skb; 1578 if (pmc->mca_crcount || isquery) { 1579 /* make sure we have room for group header */ 1580 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1581 mld_sendpack(skb); 1582 skb = NULL; /* add_grhead will get a new one */ 1583 } 1584 skb = add_grhead(skb, pmc, type, &pgr); 1585 } 1586 } 1587 if (pgr) 1588 pgr->grec_nsrcs = htons(scount); 1589 1590 if (isquery) 1591 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1592 return skb; 1593 } 1594 1595 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1596 { 1597 struct sk_buff *skb = NULL; 1598 int type; 1599 1600 if (!pmc) { 1601 read_lock_bh(&idev->lock); 1602 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1603 if (pmc->mca_flags & MAF_NOREPORT) 1604 continue; 1605 spin_lock_bh(&pmc->mca_lock); 1606 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1607 type = MLD2_MODE_IS_EXCLUDE; 1608 else 1609 type = MLD2_MODE_IS_INCLUDE; 1610 skb = add_grec(skb, pmc, type, 0, 0); 1611 spin_unlock_bh(&pmc->mca_lock); 1612 } 1613 read_unlock_bh(&idev->lock); 1614 } else { 1615 spin_lock_bh(&pmc->mca_lock); 1616 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1617 type = MLD2_MODE_IS_EXCLUDE; 1618 else 1619 type = MLD2_MODE_IS_INCLUDE; 1620 skb = add_grec(skb, pmc, type, 0, 0); 1621 spin_unlock_bh(&pmc->mca_lock); 1622 } 1623 if (skb) 1624 mld_sendpack(skb); 1625 } 1626 1627 /* 1628 * remove zero-count source records from a source filter list 1629 */ 1630 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1631 { 1632 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1633 1634 psf_prev = NULL; 1635 for (psf=*ppsf; psf; psf = psf_next) { 1636 psf_next = psf->sf_next; 1637 if (psf->sf_crcount == 0) { 1638 if (psf_prev) 1639 psf_prev->sf_next = psf->sf_next; 1640 else 1641 *ppsf = psf->sf_next; 1642 kfree(psf); 1643 } else 1644 psf_prev = psf; 1645 } 1646 } 1647 1648 static void mld_send_cr(struct inet6_dev *idev) 1649 { 1650 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1651 struct sk_buff *skb = NULL; 1652 int type, dtype; 1653 1654 read_lock_bh(&idev->lock); 1655 spin_lock(&idev->mc_lock); 1656 1657 /* deleted MCA's */ 1658 pmc_prev = NULL; 1659 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1660 pmc_next = pmc->next; 1661 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1662 type = MLD2_BLOCK_OLD_SOURCES; 1663 dtype = MLD2_BLOCK_OLD_SOURCES; 1664 skb = add_grec(skb, pmc, type, 1, 0); 1665 skb = add_grec(skb, pmc, dtype, 1, 1); 1666 } 1667 if (pmc->mca_crcount) { 1668 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1669 type = MLD2_CHANGE_TO_INCLUDE; 1670 skb = add_grec(skb, pmc, type, 1, 0); 1671 } 1672 pmc->mca_crcount--; 1673 if (pmc->mca_crcount == 0) { 1674 mld_clear_zeros(&pmc->mca_tomb); 1675 mld_clear_zeros(&pmc->mca_sources); 1676 } 1677 } 1678 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1679 !pmc->mca_sources) { 1680 if (pmc_prev) 1681 pmc_prev->next = pmc_next; 1682 else 1683 idev->mc_tomb = pmc_next; 1684 in6_dev_put(pmc->idev); 1685 kfree(pmc); 1686 } else 1687 pmc_prev = pmc; 1688 } 1689 spin_unlock(&idev->mc_lock); 1690 1691 /* change recs */ 1692 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1693 spin_lock_bh(&pmc->mca_lock); 1694 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1695 type = MLD2_BLOCK_OLD_SOURCES; 1696 dtype = MLD2_ALLOW_NEW_SOURCES; 1697 } else { 1698 type = MLD2_ALLOW_NEW_SOURCES; 1699 dtype = MLD2_BLOCK_OLD_SOURCES; 1700 } 1701 skb = add_grec(skb, pmc, type, 0, 0); 1702 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1703 1704 /* filter mode changes */ 1705 if (pmc->mca_crcount) { 1706 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1707 type = MLD2_CHANGE_TO_EXCLUDE; 1708 else 1709 type = MLD2_CHANGE_TO_INCLUDE; 1710 skb = add_grec(skb, pmc, type, 0, 0); 1711 pmc->mca_crcount--; 1712 } 1713 spin_unlock_bh(&pmc->mca_lock); 1714 } 1715 read_unlock_bh(&idev->lock); 1716 if (!skb) 1717 return; 1718 (void) mld_sendpack(skb); 1719 } 1720 1721 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1722 { 1723 struct net *net = dev_net(dev); 1724 struct sock *sk = net->ipv6.igmp_sk; 1725 struct inet6_dev *idev; 1726 struct sk_buff *skb; 1727 struct mld_msg *hdr; 1728 const struct in6_addr *snd_addr, *saddr; 1729 struct in6_addr addr_buf; 1730 int err, len, payload_len, full_len; 1731 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1732 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1733 IPV6_TLV_PADN, 0 }; 1734 struct flowi6 fl6; 1735 struct dst_entry *dst; 1736 1737 if (type == ICMPV6_MGM_REDUCTION) 1738 snd_addr = &in6addr_linklocal_allrouters; 1739 else 1740 snd_addr = addr; 1741 1742 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1743 payload_len = len + sizeof(ra); 1744 full_len = sizeof(struct ipv6hdr) + payload_len; 1745 1746 rcu_read_lock(); 1747 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1748 IPSTATS_MIB_OUT, full_len); 1749 rcu_read_unlock(); 1750 1751 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err); 1752 1753 if (skb == NULL) { 1754 rcu_read_lock(); 1755 IP6_INC_STATS(net, __in6_dev_get(dev), 1756 IPSTATS_MIB_OUTDISCARDS); 1757 rcu_read_unlock(); 1758 return; 1759 } 1760 1761 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1762 1763 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1764 /* <draft-ietf-magma-mld-source-05.txt>: 1765 * use unspecified address as the source address 1766 * when a valid link-local address is not available. 1767 */ 1768 saddr = &in6addr_any; 1769 } else 1770 saddr = &addr_buf; 1771 1772 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1773 1774 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1775 1776 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1777 memset(hdr, 0, sizeof(struct mld_msg)); 1778 hdr->mld_type = type; 1779 ipv6_addr_copy(&hdr->mld_mca, addr); 1780 1781 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1782 IPPROTO_ICMPV6, 1783 csum_partial(hdr, len, 0)); 1784 1785 rcu_read_lock(); 1786 idev = __in6_dev_get(skb->dev); 1787 1788 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1789 if (!dst) { 1790 err = -ENOMEM; 1791 goto err_out; 1792 } 1793 1794 icmpv6_flow_init(sk, &fl6, type, 1795 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1796 skb->dev->ifindex); 1797 1798 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); 1799 if (IS_ERR(dst)) { 1800 err = PTR_ERR(dst); 1801 goto err_out; 1802 } 1803 1804 skb_dst_set(skb, dst); 1805 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1806 dst_output); 1807 out: 1808 if (!err) { 1809 ICMP6MSGOUT_INC_STATS(net, idev, type); 1810 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1811 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1812 } else 1813 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1814 1815 rcu_read_unlock(); 1816 return; 1817 1818 err_out: 1819 kfree_skb(skb); 1820 goto out; 1821 } 1822 1823 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1824 struct in6_addr *psfsrc) 1825 { 1826 struct ip6_sf_list *psf, *psf_prev; 1827 int rv = 0; 1828 1829 psf_prev = NULL; 1830 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1831 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1832 break; 1833 psf_prev = psf; 1834 } 1835 if (!psf || psf->sf_count[sfmode] == 0) { 1836 /* source filter not found, or count wrong => bug */ 1837 return -ESRCH; 1838 } 1839 psf->sf_count[sfmode]--; 1840 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1841 struct inet6_dev *idev = pmc->idev; 1842 1843 /* no more filters for this source */ 1844 if (psf_prev) 1845 psf_prev->sf_next = psf->sf_next; 1846 else 1847 pmc->mca_sources = psf->sf_next; 1848 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1849 !MLD_V1_SEEN(idev)) { 1850 psf->sf_crcount = idev->mc_qrv; 1851 psf->sf_next = pmc->mca_tomb; 1852 pmc->mca_tomb = psf; 1853 rv = 1; 1854 } else 1855 kfree(psf); 1856 } 1857 return rv; 1858 } 1859 1860 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1861 int sfmode, int sfcount, struct in6_addr *psfsrc, 1862 int delta) 1863 { 1864 struct ifmcaddr6 *pmc; 1865 int changerec = 0; 1866 int i, err; 1867 1868 if (!idev) 1869 return -ENODEV; 1870 read_lock_bh(&idev->lock); 1871 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1872 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1873 break; 1874 } 1875 if (!pmc) { 1876 /* MCA not found?? bug */ 1877 read_unlock_bh(&idev->lock); 1878 return -ESRCH; 1879 } 1880 spin_lock_bh(&pmc->mca_lock); 1881 sf_markstate(pmc); 1882 if (!delta) { 1883 if (!pmc->mca_sfcount[sfmode]) { 1884 spin_unlock_bh(&pmc->mca_lock); 1885 read_unlock_bh(&idev->lock); 1886 return -EINVAL; 1887 } 1888 pmc->mca_sfcount[sfmode]--; 1889 } 1890 err = 0; 1891 for (i=0; i<sfcount; i++) { 1892 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1893 1894 changerec |= rv > 0; 1895 if (!err && rv < 0) 1896 err = rv; 1897 } 1898 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1899 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1900 pmc->mca_sfcount[MCAST_INCLUDE]) { 1901 struct ip6_sf_list *psf; 1902 1903 /* filter mode change */ 1904 pmc->mca_sfmode = MCAST_INCLUDE; 1905 pmc->mca_crcount = idev->mc_qrv; 1906 idev->mc_ifc_count = pmc->mca_crcount; 1907 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1908 psf->sf_crcount = 0; 1909 mld_ifc_event(pmc->idev); 1910 } else if (sf_setstate(pmc) || changerec) 1911 mld_ifc_event(pmc->idev); 1912 spin_unlock_bh(&pmc->mca_lock); 1913 read_unlock_bh(&idev->lock); 1914 return err; 1915 } 1916 1917 /* 1918 * Add multicast single-source filter to the interface list 1919 */ 1920 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1921 struct in6_addr *psfsrc, int delta) 1922 { 1923 struct ip6_sf_list *psf, *psf_prev; 1924 1925 psf_prev = NULL; 1926 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1927 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1928 break; 1929 psf_prev = psf; 1930 } 1931 if (!psf) { 1932 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1933 if (!psf) 1934 return -ENOBUFS; 1935 1936 psf->sf_addr = *psfsrc; 1937 if (psf_prev) { 1938 psf_prev->sf_next = psf; 1939 } else 1940 pmc->mca_sources = psf; 1941 } 1942 psf->sf_count[sfmode]++; 1943 return 0; 1944 } 1945 1946 static void sf_markstate(struct ifmcaddr6 *pmc) 1947 { 1948 struct ip6_sf_list *psf; 1949 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1950 1951 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1952 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1953 psf->sf_oldin = mca_xcount == 1954 psf->sf_count[MCAST_EXCLUDE] && 1955 !psf->sf_count[MCAST_INCLUDE]; 1956 } else 1957 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1958 } 1959 1960 static int sf_setstate(struct ifmcaddr6 *pmc) 1961 { 1962 struct ip6_sf_list *psf, *dpsf; 1963 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1964 int qrv = pmc->idev->mc_qrv; 1965 int new_in, rv; 1966 1967 rv = 0; 1968 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1969 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1970 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1971 !psf->sf_count[MCAST_INCLUDE]; 1972 } else 1973 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1974 if (new_in) { 1975 if (!psf->sf_oldin) { 1976 struct ip6_sf_list *prev = NULL; 1977 1978 for (dpsf=pmc->mca_tomb; dpsf; 1979 dpsf=dpsf->sf_next) { 1980 if (ipv6_addr_equal(&dpsf->sf_addr, 1981 &psf->sf_addr)) 1982 break; 1983 prev = dpsf; 1984 } 1985 if (dpsf) { 1986 if (prev) 1987 prev->sf_next = dpsf->sf_next; 1988 else 1989 pmc->mca_tomb = dpsf->sf_next; 1990 kfree(dpsf); 1991 } 1992 psf->sf_crcount = qrv; 1993 rv++; 1994 } 1995 } else if (psf->sf_oldin) { 1996 psf->sf_crcount = 0; 1997 /* 1998 * add or update "delete" records if an active filter 1999 * is now inactive 2000 */ 2001 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2002 if (ipv6_addr_equal(&dpsf->sf_addr, 2003 &psf->sf_addr)) 2004 break; 2005 if (!dpsf) { 2006 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2007 if (!dpsf) 2008 continue; 2009 *dpsf = *psf; 2010 /* pmc->mca_lock held by callers */ 2011 dpsf->sf_next = pmc->mca_tomb; 2012 pmc->mca_tomb = dpsf; 2013 } 2014 dpsf->sf_crcount = qrv; 2015 rv++; 2016 } 2017 } 2018 return rv; 2019 } 2020 2021 /* 2022 * Add multicast source filter list to the interface list 2023 */ 2024 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2025 int sfmode, int sfcount, struct in6_addr *psfsrc, 2026 int delta) 2027 { 2028 struct ifmcaddr6 *pmc; 2029 int isexclude; 2030 int i, err; 2031 2032 if (!idev) 2033 return -ENODEV; 2034 read_lock_bh(&idev->lock); 2035 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2036 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2037 break; 2038 } 2039 if (!pmc) { 2040 /* MCA not found?? bug */ 2041 read_unlock_bh(&idev->lock); 2042 return -ESRCH; 2043 } 2044 spin_lock_bh(&pmc->mca_lock); 2045 2046 sf_markstate(pmc); 2047 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2048 if (!delta) 2049 pmc->mca_sfcount[sfmode]++; 2050 err = 0; 2051 for (i=0; i<sfcount; i++) { 2052 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2053 if (err) 2054 break; 2055 } 2056 if (err) { 2057 int j; 2058 2059 if (!delta) 2060 pmc->mca_sfcount[sfmode]--; 2061 for (j=0; j<i; j++) 2062 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2063 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2064 struct ip6_sf_list *psf; 2065 2066 /* filter mode change */ 2067 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2068 pmc->mca_sfmode = MCAST_EXCLUDE; 2069 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2070 pmc->mca_sfmode = MCAST_INCLUDE; 2071 /* else no filters; keep old mode for reports */ 2072 2073 pmc->mca_crcount = idev->mc_qrv; 2074 idev->mc_ifc_count = pmc->mca_crcount; 2075 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2076 psf->sf_crcount = 0; 2077 mld_ifc_event(idev); 2078 } else if (sf_setstate(pmc)) 2079 mld_ifc_event(idev); 2080 spin_unlock_bh(&pmc->mca_lock); 2081 read_unlock_bh(&idev->lock); 2082 return err; 2083 } 2084 2085 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2086 { 2087 struct ip6_sf_list *psf, *nextpsf; 2088 2089 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2090 nextpsf = psf->sf_next; 2091 kfree(psf); 2092 } 2093 pmc->mca_tomb = NULL; 2094 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2095 nextpsf = psf->sf_next; 2096 kfree(psf); 2097 } 2098 pmc->mca_sources = NULL; 2099 pmc->mca_sfmode = MCAST_EXCLUDE; 2100 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2101 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2102 } 2103 2104 2105 static void igmp6_join_group(struct ifmcaddr6 *ma) 2106 { 2107 unsigned long delay; 2108 2109 if (ma->mca_flags & MAF_NOREPORT) 2110 return; 2111 2112 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2113 2114 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2115 2116 spin_lock_bh(&ma->mca_lock); 2117 if (del_timer(&ma->mca_timer)) { 2118 atomic_dec(&ma->mca_refcnt); 2119 delay = ma->mca_timer.expires - jiffies; 2120 } 2121 2122 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2123 atomic_inc(&ma->mca_refcnt); 2124 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2125 spin_unlock_bh(&ma->mca_lock); 2126 } 2127 2128 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2129 struct inet6_dev *idev) 2130 { 2131 int err; 2132 2133 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2134 * so no other readers or writers of iml or its sflist 2135 */ 2136 if (!iml->sflist) { 2137 /* any-source empty exclude case */ 2138 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2139 } 2140 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2141 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2142 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2143 iml->sflist = NULL; 2144 return err; 2145 } 2146 2147 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2148 { 2149 if (MLD_V1_SEEN(ma->idev)) { 2150 if (ma->mca_flags & MAF_LAST_REPORTER) 2151 igmp6_send(&ma->mca_addr, ma->idev->dev, 2152 ICMPV6_MGM_REDUCTION); 2153 } else { 2154 mld_add_delrec(ma->idev, ma); 2155 mld_ifc_event(ma->idev); 2156 } 2157 } 2158 2159 static void mld_gq_timer_expire(unsigned long data) 2160 { 2161 struct inet6_dev *idev = (struct inet6_dev *)data; 2162 2163 idev->mc_gq_running = 0; 2164 mld_send_report(idev, NULL); 2165 __in6_dev_put(idev); 2166 } 2167 2168 static void mld_ifc_timer_expire(unsigned long data) 2169 { 2170 struct inet6_dev *idev = (struct inet6_dev *)data; 2171 2172 mld_send_cr(idev); 2173 if (idev->mc_ifc_count) { 2174 idev->mc_ifc_count--; 2175 if (idev->mc_ifc_count) 2176 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2177 } 2178 __in6_dev_put(idev); 2179 } 2180 2181 static void mld_ifc_event(struct inet6_dev *idev) 2182 { 2183 if (MLD_V1_SEEN(idev)) 2184 return; 2185 idev->mc_ifc_count = idev->mc_qrv; 2186 mld_ifc_start_timer(idev, 1); 2187 } 2188 2189 2190 static void igmp6_timer_handler(unsigned long data) 2191 { 2192 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2193 2194 if (MLD_V1_SEEN(ma->idev)) 2195 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2196 else 2197 mld_send_report(ma->idev, ma); 2198 2199 spin_lock(&ma->mca_lock); 2200 ma->mca_flags |= MAF_LAST_REPORTER; 2201 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2202 spin_unlock(&ma->mca_lock); 2203 ma_put(ma); 2204 } 2205 2206 /* Device changing type */ 2207 2208 void ipv6_mc_unmap(struct inet6_dev *idev) 2209 { 2210 struct ifmcaddr6 *i; 2211 2212 /* Install multicast list, except for all-nodes (already installed) */ 2213 2214 read_lock_bh(&idev->lock); 2215 for (i = idev->mc_list; i; i = i->next) 2216 igmp6_group_dropped(i); 2217 read_unlock_bh(&idev->lock); 2218 } 2219 2220 void ipv6_mc_remap(struct inet6_dev *idev) 2221 { 2222 ipv6_mc_up(idev); 2223 } 2224 2225 /* Device going down */ 2226 2227 void ipv6_mc_down(struct inet6_dev *idev) 2228 { 2229 struct ifmcaddr6 *i; 2230 2231 /* Withdraw multicast list */ 2232 2233 read_lock_bh(&idev->lock); 2234 idev->mc_ifc_count = 0; 2235 if (del_timer(&idev->mc_ifc_timer)) 2236 __in6_dev_put(idev); 2237 idev->mc_gq_running = 0; 2238 if (del_timer(&idev->mc_gq_timer)) 2239 __in6_dev_put(idev); 2240 2241 for (i = idev->mc_list; i; i=i->next) 2242 igmp6_group_dropped(i); 2243 read_unlock_bh(&idev->lock); 2244 2245 mld_clear_delrec(idev); 2246 } 2247 2248 2249 /* Device going up */ 2250 2251 void ipv6_mc_up(struct inet6_dev *idev) 2252 { 2253 struct ifmcaddr6 *i; 2254 2255 /* Install multicast list, except for all-nodes (already installed) */ 2256 2257 read_lock_bh(&idev->lock); 2258 for (i = idev->mc_list; i; i=i->next) 2259 igmp6_group_added(i); 2260 read_unlock_bh(&idev->lock); 2261 } 2262 2263 /* IPv6 device initialization. */ 2264 2265 void ipv6_mc_init_dev(struct inet6_dev *idev) 2266 { 2267 write_lock_bh(&idev->lock); 2268 spin_lock_init(&idev->mc_lock); 2269 idev->mc_gq_running = 0; 2270 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2271 (unsigned long)idev); 2272 idev->mc_tomb = NULL; 2273 idev->mc_ifc_count = 0; 2274 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2275 (unsigned long)idev); 2276 idev->mc_qrv = MLD_QRV_DEFAULT; 2277 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2278 idev->mc_v1_seen = 0; 2279 write_unlock_bh(&idev->lock); 2280 } 2281 2282 /* 2283 * Device is about to be destroyed: clean up. 2284 */ 2285 2286 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2287 { 2288 struct ifmcaddr6 *i; 2289 2290 /* Deactivate timers */ 2291 ipv6_mc_down(idev); 2292 2293 /* Delete all-nodes address. */ 2294 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2295 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2296 * fail. 2297 */ 2298 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2299 2300 if (idev->cnf.forwarding) 2301 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2302 2303 write_lock_bh(&idev->lock); 2304 while ((i = idev->mc_list) != NULL) { 2305 idev->mc_list = i->next; 2306 write_unlock_bh(&idev->lock); 2307 2308 igmp6_group_dropped(i); 2309 ma_put(i); 2310 2311 write_lock_bh(&idev->lock); 2312 } 2313 write_unlock_bh(&idev->lock); 2314 } 2315 2316 #ifdef CONFIG_PROC_FS 2317 struct igmp6_mc_iter_state { 2318 struct seq_net_private p; 2319 struct net_device *dev; 2320 struct inet6_dev *idev; 2321 }; 2322 2323 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2324 2325 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2326 { 2327 struct ifmcaddr6 *im = NULL; 2328 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2329 struct net *net = seq_file_net(seq); 2330 2331 state->idev = NULL; 2332 for_each_netdev_rcu(net, state->dev) { 2333 struct inet6_dev *idev; 2334 idev = __in6_dev_get(state->dev); 2335 if (!idev) 2336 continue; 2337 read_lock_bh(&idev->lock); 2338 im = idev->mc_list; 2339 if (im) { 2340 state->idev = idev; 2341 break; 2342 } 2343 read_unlock_bh(&idev->lock); 2344 } 2345 return im; 2346 } 2347 2348 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2349 { 2350 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2351 2352 im = im->next; 2353 while (!im) { 2354 if (likely(state->idev != NULL)) 2355 read_unlock_bh(&state->idev->lock); 2356 2357 state->dev = next_net_device_rcu(state->dev); 2358 if (!state->dev) { 2359 state->idev = NULL; 2360 break; 2361 } 2362 state->idev = __in6_dev_get(state->dev); 2363 if (!state->idev) 2364 continue; 2365 read_lock_bh(&state->idev->lock); 2366 im = state->idev->mc_list; 2367 } 2368 return im; 2369 } 2370 2371 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2372 { 2373 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2374 if (im) 2375 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2376 --pos; 2377 return pos ? NULL : im; 2378 } 2379 2380 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2381 __acquires(RCU) 2382 { 2383 rcu_read_lock(); 2384 return igmp6_mc_get_idx(seq, *pos); 2385 } 2386 2387 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2388 { 2389 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2390 2391 ++*pos; 2392 return im; 2393 } 2394 2395 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2396 __releases(RCU) 2397 { 2398 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2399 2400 if (likely(state->idev != NULL)) { 2401 read_unlock_bh(&state->idev->lock); 2402 state->idev = NULL; 2403 } 2404 state->dev = NULL; 2405 rcu_read_unlock(); 2406 } 2407 2408 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2409 { 2410 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2411 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2412 2413 seq_printf(seq, 2414 "%-4d %-15s %pi6 %5d %08X %ld\n", 2415 state->dev->ifindex, state->dev->name, 2416 &im->mca_addr, 2417 im->mca_users, im->mca_flags, 2418 (im->mca_flags&MAF_TIMER_RUNNING) ? 2419 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2420 return 0; 2421 } 2422 2423 static const struct seq_operations igmp6_mc_seq_ops = { 2424 .start = igmp6_mc_seq_start, 2425 .next = igmp6_mc_seq_next, 2426 .stop = igmp6_mc_seq_stop, 2427 .show = igmp6_mc_seq_show, 2428 }; 2429 2430 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2431 { 2432 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2433 sizeof(struct igmp6_mc_iter_state)); 2434 } 2435 2436 static const struct file_operations igmp6_mc_seq_fops = { 2437 .owner = THIS_MODULE, 2438 .open = igmp6_mc_seq_open, 2439 .read = seq_read, 2440 .llseek = seq_lseek, 2441 .release = seq_release_net, 2442 }; 2443 2444 struct igmp6_mcf_iter_state { 2445 struct seq_net_private p; 2446 struct net_device *dev; 2447 struct inet6_dev *idev; 2448 struct ifmcaddr6 *im; 2449 }; 2450 2451 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2452 2453 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2454 { 2455 struct ip6_sf_list *psf = NULL; 2456 struct ifmcaddr6 *im = NULL; 2457 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2458 struct net *net = seq_file_net(seq); 2459 2460 state->idev = NULL; 2461 state->im = NULL; 2462 for_each_netdev_rcu(net, state->dev) { 2463 struct inet6_dev *idev; 2464 idev = __in6_dev_get(state->dev); 2465 if (unlikely(idev == NULL)) 2466 continue; 2467 read_lock_bh(&idev->lock); 2468 im = idev->mc_list; 2469 if (likely(im != NULL)) { 2470 spin_lock_bh(&im->mca_lock); 2471 psf = im->mca_sources; 2472 if (likely(psf != NULL)) { 2473 state->im = im; 2474 state->idev = idev; 2475 break; 2476 } 2477 spin_unlock_bh(&im->mca_lock); 2478 } 2479 read_unlock_bh(&idev->lock); 2480 } 2481 return psf; 2482 } 2483 2484 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2485 { 2486 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2487 2488 psf = psf->sf_next; 2489 while (!psf) { 2490 spin_unlock_bh(&state->im->mca_lock); 2491 state->im = state->im->next; 2492 while (!state->im) { 2493 if (likely(state->idev != NULL)) 2494 read_unlock_bh(&state->idev->lock); 2495 2496 state->dev = next_net_device_rcu(state->dev); 2497 if (!state->dev) { 2498 state->idev = NULL; 2499 goto out; 2500 } 2501 state->idev = __in6_dev_get(state->dev); 2502 if (!state->idev) 2503 continue; 2504 read_lock_bh(&state->idev->lock); 2505 state->im = state->idev->mc_list; 2506 } 2507 if (!state->im) 2508 break; 2509 spin_lock_bh(&state->im->mca_lock); 2510 psf = state->im->mca_sources; 2511 } 2512 out: 2513 return psf; 2514 } 2515 2516 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2517 { 2518 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2519 if (psf) 2520 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2521 --pos; 2522 return pos ? NULL : psf; 2523 } 2524 2525 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2526 __acquires(RCU) 2527 { 2528 rcu_read_lock(); 2529 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2530 } 2531 2532 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2533 { 2534 struct ip6_sf_list *psf; 2535 if (v == SEQ_START_TOKEN) 2536 psf = igmp6_mcf_get_first(seq); 2537 else 2538 psf = igmp6_mcf_get_next(seq, v); 2539 ++*pos; 2540 return psf; 2541 } 2542 2543 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2544 __releases(RCU) 2545 { 2546 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2547 if (likely(state->im != NULL)) { 2548 spin_unlock_bh(&state->im->mca_lock); 2549 state->im = NULL; 2550 } 2551 if (likely(state->idev != NULL)) { 2552 read_unlock_bh(&state->idev->lock); 2553 state->idev = NULL; 2554 } 2555 state->dev = NULL; 2556 rcu_read_unlock(); 2557 } 2558 2559 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2560 { 2561 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2562 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2563 2564 if (v == SEQ_START_TOKEN) { 2565 seq_printf(seq, 2566 "%3s %6s " 2567 "%32s %32s %6s %6s\n", "Idx", 2568 "Device", "Multicast Address", 2569 "Source Address", "INC", "EXC"); 2570 } else { 2571 seq_printf(seq, 2572 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2573 state->dev->ifindex, state->dev->name, 2574 &state->im->mca_addr, 2575 &psf->sf_addr, 2576 psf->sf_count[MCAST_INCLUDE], 2577 psf->sf_count[MCAST_EXCLUDE]); 2578 } 2579 return 0; 2580 } 2581 2582 static const struct seq_operations igmp6_mcf_seq_ops = { 2583 .start = igmp6_mcf_seq_start, 2584 .next = igmp6_mcf_seq_next, 2585 .stop = igmp6_mcf_seq_stop, 2586 .show = igmp6_mcf_seq_show, 2587 }; 2588 2589 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2590 { 2591 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2592 sizeof(struct igmp6_mcf_iter_state)); 2593 } 2594 2595 static const struct file_operations igmp6_mcf_seq_fops = { 2596 .owner = THIS_MODULE, 2597 .open = igmp6_mcf_seq_open, 2598 .read = seq_read, 2599 .llseek = seq_lseek, 2600 .release = seq_release_net, 2601 }; 2602 2603 static int __net_init igmp6_proc_init(struct net *net) 2604 { 2605 int err; 2606 2607 err = -ENOMEM; 2608 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2609 goto out; 2610 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2611 &igmp6_mcf_seq_fops)) 2612 goto out_proc_net_igmp6; 2613 2614 err = 0; 2615 out: 2616 return err; 2617 2618 out_proc_net_igmp6: 2619 proc_net_remove(net, "igmp6"); 2620 goto out; 2621 } 2622 2623 static void __net_exit igmp6_proc_exit(struct net *net) 2624 { 2625 proc_net_remove(net, "mcfilter6"); 2626 proc_net_remove(net, "igmp6"); 2627 } 2628 #else 2629 static inline int igmp6_proc_init(struct net *net) 2630 { 2631 return 0; 2632 } 2633 static inline void igmp6_proc_exit(struct net *net) 2634 { 2635 } 2636 #endif 2637 2638 static int __net_init igmp6_net_init(struct net *net) 2639 { 2640 int err; 2641 2642 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2643 SOCK_RAW, IPPROTO_ICMPV6, net); 2644 if (err < 0) { 2645 printk(KERN_ERR 2646 "Failed to initialize the IGMP6 control socket (err %d).\n", 2647 err); 2648 goto out; 2649 } 2650 2651 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2652 2653 err = igmp6_proc_init(net); 2654 if (err) 2655 goto out_sock_create; 2656 out: 2657 return err; 2658 2659 out_sock_create: 2660 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2661 goto out; 2662 } 2663 2664 static void __net_exit igmp6_net_exit(struct net *net) 2665 { 2666 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2667 igmp6_proc_exit(net); 2668 } 2669 2670 static struct pernet_operations igmp6_net_ops = { 2671 .init = igmp6_net_init, 2672 .exit = igmp6_net_exit, 2673 }; 2674 2675 int __init igmp6_init(void) 2676 { 2677 return register_pernet_subsys(&igmp6_net_ops); 2678 } 2679 2680 void igmp6_cleanup(void) 2681 { 2682 unregister_pernet_subsys(&igmp6_net_ops); 2683 } 2684