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, const 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, const struct in6_addr *pmca, 101 int sfmode, int sfcount, const struct in6_addr *psfsrc, 102 int delta); 103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 104 int sfmode, int sfcount, const 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 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->dst.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 /* 205 * socket leave on multicast group 206 */ 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 208 { 209 struct ipv6_pinfo *np = inet6_sk(sk); 210 struct ipv6_mc_socklist *mc_lst; 211 struct ipv6_mc_socklist __rcu **lnk; 212 struct net *net = sock_net(sk); 213 214 spin_lock(&ipv6_sk_mc_lock); 215 for (lnk = &np->ipv6_mc_list; 216 (mc_lst = rcu_dereference_protected(*lnk, 217 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ; 218 lnk = &mc_lst->next) { 219 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 220 ipv6_addr_equal(&mc_lst->addr, addr)) { 221 struct net_device *dev; 222 223 *lnk = mc_lst->next; 224 spin_unlock(&ipv6_sk_mc_lock); 225 226 rcu_read_lock(); 227 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 228 if (dev != NULL) { 229 struct inet6_dev *idev = __in6_dev_get(dev); 230 231 (void) ip6_mc_leave_src(sk, mc_lst, idev); 232 if (idev) 233 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 234 } else 235 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 236 rcu_read_unlock(); 237 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 238 kfree_rcu(mc_lst, rcu); 239 return 0; 240 } 241 } 242 spin_unlock(&ipv6_sk_mc_lock); 243 244 return -EADDRNOTAVAIL; 245 } 246 247 /* called with rcu_read_lock() */ 248 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 249 const struct in6_addr *group, 250 int ifindex) 251 { 252 struct net_device *dev = NULL; 253 struct inet6_dev *idev = NULL; 254 255 if (ifindex == 0) { 256 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); 257 258 if (rt) { 259 dev = rt->dst.dev; 260 dev_hold(dev); 261 dst_release(&rt->dst); 262 } 263 } else 264 dev = dev_get_by_index_rcu(net, ifindex); 265 266 if (!dev) 267 return NULL; 268 idev = __in6_dev_get(dev); 269 if (!idev) 270 return NULL; 271 read_lock_bh(&idev->lock); 272 if (idev->dead) { 273 read_unlock_bh(&idev->lock); 274 return NULL; 275 } 276 return idev; 277 } 278 279 void ipv6_sock_mc_close(struct sock *sk) 280 { 281 struct ipv6_pinfo *np = inet6_sk(sk); 282 struct ipv6_mc_socklist *mc_lst; 283 struct net *net = sock_net(sk); 284 285 spin_lock(&ipv6_sk_mc_lock); 286 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list, 287 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) { 288 struct net_device *dev; 289 290 np->ipv6_mc_list = mc_lst->next; 291 spin_unlock(&ipv6_sk_mc_lock); 292 293 rcu_read_lock(); 294 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 295 if (dev) { 296 struct inet6_dev *idev = __in6_dev_get(dev); 297 298 (void) ip6_mc_leave_src(sk, mc_lst, idev); 299 if (idev) 300 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 301 } else 302 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 303 rcu_read_unlock(); 304 305 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 306 kfree_rcu(mc_lst, rcu); 307 308 spin_lock(&ipv6_sk_mc_lock); 309 } 310 spin_unlock(&ipv6_sk_mc_lock); 311 } 312 313 int ip6_mc_source(int add, int omode, struct sock *sk, 314 struct group_source_req *pgsr) 315 { 316 struct in6_addr *source, *group; 317 struct ipv6_mc_socklist *pmc; 318 struct inet6_dev *idev; 319 struct ipv6_pinfo *inet6 = inet6_sk(sk); 320 struct ip6_sf_socklist *psl; 321 struct net *net = sock_net(sk); 322 int i, j, rv; 323 int leavegroup = 0; 324 int pmclocked = 0; 325 int err; 326 327 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 328 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 329 330 if (!ipv6_addr_is_multicast(group)) 331 return -EINVAL; 332 333 rcu_read_lock(); 334 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 335 if (!idev) { 336 rcu_read_unlock(); 337 return -ENODEV; 338 } 339 340 err = -EADDRNOTAVAIL; 341 342 for_each_pmc_rcu(inet6, pmc) { 343 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 344 continue; 345 if (ipv6_addr_equal(&pmc->addr, group)) 346 break; 347 } 348 if (!pmc) { /* must have a prior join */ 349 err = -EINVAL; 350 goto done; 351 } 352 /* if a source filter was set, must be the same mode as before */ 353 if (pmc->sflist) { 354 if (pmc->sfmode != omode) { 355 err = -EINVAL; 356 goto done; 357 } 358 } else if (pmc->sfmode != omode) { 359 /* allow mode switches for empty-set filters */ 360 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 361 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 362 pmc->sfmode = omode; 363 } 364 365 write_lock(&pmc->sflock); 366 pmclocked = 1; 367 368 psl = pmc->sflist; 369 if (!add) { 370 if (!psl) 371 goto done; /* err = -EADDRNOTAVAIL */ 372 rv = !0; 373 for (i=0; i<psl->sl_count; i++) { 374 rv = memcmp(&psl->sl_addr[i], source, 375 sizeof(struct in6_addr)); 376 if (rv == 0) 377 break; 378 } 379 if (rv) /* source not found */ 380 goto done; /* err = -EADDRNOTAVAIL */ 381 382 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 383 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 384 leavegroup = 1; 385 goto done; 386 } 387 388 /* update the interface filter */ 389 ip6_mc_del_src(idev, group, omode, 1, source, 1); 390 391 for (j=i+1; j<psl->sl_count; j++) 392 psl->sl_addr[j-1] = psl->sl_addr[j]; 393 psl->sl_count--; 394 err = 0; 395 goto done; 396 } 397 /* else, add a new source to the filter */ 398 399 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 400 err = -ENOBUFS; 401 goto done; 402 } 403 if (!psl || psl->sl_count == psl->sl_max) { 404 struct ip6_sf_socklist *newpsl; 405 int count = IP6_SFBLOCK; 406 407 if (psl) 408 count += psl->sl_max; 409 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 410 if (!newpsl) { 411 err = -ENOBUFS; 412 goto done; 413 } 414 newpsl->sl_max = count; 415 newpsl->sl_count = count - IP6_SFBLOCK; 416 if (psl) { 417 for (i=0; i<psl->sl_count; i++) 418 newpsl->sl_addr[i] = psl->sl_addr[i]; 419 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 420 } 421 pmc->sflist = psl = newpsl; 422 } 423 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 424 for (i=0; i<psl->sl_count; i++) { 425 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 426 if (rv == 0) 427 break; 428 } 429 if (rv == 0) /* address already there is an error */ 430 goto done; 431 for (j=psl->sl_count-1; j>=i; j--) 432 psl->sl_addr[j+1] = psl->sl_addr[j]; 433 psl->sl_addr[i] = *source; 434 psl->sl_count++; 435 err = 0; 436 /* update the interface list */ 437 ip6_mc_add_src(idev, group, omode, 1, source, 1); 438 done: 439 if (pmclocked) 440 write_unlock(&pmc->sflock); 441 read_unlock_bh(&idev->lock); 442 rcu_read_unlock(); 443 if (leavegroup) 444 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 445 return err; 446 } 447 448 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 449 { 450 const struct in6_addr *group; 451 struct ipv6_mc_socklist *pmc; 452 struct inet6_dev *idev; 453 struct ipv6_pinfo *inet6 = inet6_sk(sk); 454 struct ip6_sf_socklist *newpsl, *psl; 455 struct net *net = sock_net(sk); 456 int leavegroup = 0; 457 int i, err; 458 459 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 460 461 if (!ipv6_addr_is_multicast(group)) 462 return -EINVAL; 463 if (gsf->gf_fmode != MCAST_INCLUDE && 464 gsf->gf_fmode != MCAST_EXCLUDE) 465 return -EINVAL; 466 467 rcu_read_lock(); 468 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 469 470 if (!idev) { 471 rcu_read_unlock(); 472 return -ENODEV; 473 } 474 475 err = 0; 476 477 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 478 leavegroup = 1; 479 goto done; 480 } 481 482 for_each_pmc_rcu(inet6, pmc) { 483 if (pmc->ifindex != gsf->gf_interface) 484 continue; 485 if (ipv6_addr_equal(&pmc->addr, group)) 486 break; 487 } 488 if (!pmc) { /* must have a prior join */ 489 err = -EINVAL; 490 goto done; 491 } 492 if (gsf->gf_numsrc) { 493 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 494 GFP_ATOMIC); 495 if (!newpsl) { 496 err = -ENOBUFS; 497 goto done; 498 } 499 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 500 for (i=0; i<newpsl->sl_count; ++i) { 501 struct sockaddr_in6 *psin6; 502 503 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 504 newpsl->sl_addr[i] = psin6->sin6_addr; 505 } 506 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 507 newpsl->sl_count, newpsl->sl_addr, 0); 508 if (err) { 509 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 510 goto done; 511 } 512 } else { 513 newpsl = NULL; 514 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 515 } 516 517 write_lock(&pmc->sflock); 518 psl = pmc->sflist; 519 if (psl) { 520 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 521 psl->sl_count, psl->sl_addr, 0); 522 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 523 } else 524 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 525 pmc->sflist = newpsl; 526 pmc->sfmode = gsf->gf_fmode; 527 write_unlock(&pmc->sflock); 528 err = 0; 529 done: 530 read_unlock_bh(&idev->lock); 531 rcu_read_unlock(); 532 if (leavegroup) 533 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 534 return err; 535 } 536 537 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 538 struct group_filter __user *optval, int __user *optlen) 539 { 540 int err, i, count, copycount; 541 const struct in6_addr *group; 542 struct ipv6_mc_socklist *pmc; 543 struct inet6_dev *idev; 544 struct ipv6_pinfo *inet6 = inet6_sk(sk); 545 struct ip6_sf_socklist *psl; 546 struct net *net = sock_net(sk); 547 548 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 549 550 if (!ipv6_addr_is_multicast(group)) 551 return -EINVAL; 552 553 rcu_read_lock(); 554 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 555 556 if (!idev) { 557 rcu_read_unlock(); 558 return -ENODEV; 559 } 560 561 err = -EADDRNOTAVAIL; 562 /* 563 * changes to the ipv6_mc_list require the socket lock and 564 * a read lock on ip6_sk_mc_lock. We have the socket lock, 565 * so reading the list is safe. 566 */ 567 568 for_each_pmc_rcu(inet6, pmc) { 569 if (pmc->ifindex != gsf->gf_interface) 570 continue; 571 if (ipv6_addr_equal(group, &pmc->addr)) 572 break; 573 } 574 if (!pmc) /* must have a prior join */ 575 goto done; 576 gsf->gf_fmode = pmc->sfmode; 577 psl = pmc->sflist; 578 count = psl ? psl->sl_count : 0; 579 read_unlock_bh(&idev->lock); 580 rcu_read_unlock(); 581 582 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 583 gsf->gf_numsrc = count; 584 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 585 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 586 return -EFAULT; 587 } 588 /* changes to psl require the socket lock, a read lock on 589 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 590 * have the socket lock, so reading here is safe. 591 */ 592 for (i=0; i<copycount; i++) { 593 struct sockaddr_in6 *psin6; 594 struct sockaddr_storage ss; 595 596 psin6 = (struct sockaddr_in6 *)&ss; 597 memset(&ss, 0, sizeof(ss)); 598 psin6->sin6_family = AF_INET6; 599 psin6->sin6_addr = psl->sl_addr[i]; 600 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 601 return -EFAULT; 602 } 603 return 0; 604 done: 605 read_unlock_bh(&idev->lock); 606 rcu_read_unlock(); 607 return err; 608 } 609 610 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 611 const struct in6_addr *src_addr) 612 { 613 struct ipv6_pinfo *np = inet6_sk(sk); 614 struct ipv6_mc_socklist *mc; 615 struct ip6_sf_socklist *psl; 616 int rv = 1; 617 618 rcu_read_lock(); 619 for_each_pmc_rcu(np, mc) { 620 if (ipv6_addr_equal(&mc->addr, mc_addr)) 621 break; 622 } 623 if (!mc) { 624 rcu_read_unlock(); 625 return 1; 626 } 627 read_lock(&mc->sflock); 628 psl = mc->sflist; 629 if (!psl) { 630 rv = mc->sfmode == MCAST_EXCLUDE; 631 } else { 632 int i; 633 634 for (i=0; i<psl->sl_count; i++) { 635 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 636 break; 637 } 638 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 639 rv = 0; 640 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 641 rv = 0; 642 } 643 read_unlock(&mc->sflock); 644 rcu_read_unlock(); 645 646 return rv; 647 } 648 649 static void ma_put(struct ifmcaddr6 *mc) 650 { 651 if (atomic_dec_and_test(&mc->mca_refcnt)) { 652 in6_dev_put(mc->idev); 653 kfree(mc); 654 } 655 } 656 657 static void igmp6_group_added(struct ifmcaddr6 *mc) 658 { 659 struct net_device *dev = mc->idev->dev; 660 char buf[MAX_ADDR_LEN]; 661 662 spin_lock_bh(&mc->mca_lock); 663 if (!(mc->mca_flags&MAF_LOADED)) { 664 mc->mca_flags |= MAF_LOADED; 665 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 666 dev_mc_add(dev, buf); 667 } 668 spin_unlock_bh(&mc->mca_lock); 669 670 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 671 return; 672 673 if (MLD_V1_SEEN(mc->idev)) { 674 igmp6_join_group(mc); 675 return; 676 } 677 /* else v2 */ 678 679 mc->mca_crcount = mc->idev->mc_qrv; 680 mld_ifc_event(mc->idev); 681 } 682 683 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 684 { 685 struct net_device *dev = mc->idev->dev; 686 char buf[MAX_ADDR_LEN]; 687 688 spin_lock_bh(&mc->mca_lock); 689 if (mc->mca_flags&MAF_LOADED) { 690 mc->mca_flags &= ~MAF_LOADED; 691 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 692 dev_mc_del(dev, buf); 693 } 694 695 if (mc->mca_flags & MAF_NOREPORT) 696 goto done; 697 spin_unlock_bh(&mc->mca_lock); 698 699 if (!mc->idev->dead) 700 igmp6_leave_group(mc); 701 702 spin_lock_bh(&mc->mca_lock); 703 if (del_timer(&mc->mca_timer)) 704 atomic_dec(&mc->mca_refcnt); 705 done: 706 ip6_mc_clear_src(mc); 707 spin_unlock_bh(&mc->mca_lock); 708 } 709 710 /* 711 * deleted ifmcaddr6 manipulation 712 */ 713 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 714 { 715 struct ifmcaddr6 *pmc; 716 717 /* this is an "ifmcaddr6" for convenience; only the fields below 718 * are actually used. In particular, the refcnt and users are not 719 * used for management of the delete list. Using the same structure 720 * for deleted items allows change reports to use common code with 721 * non-deleted or query-response MCA's. 722 */ 723 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 724 if (!pmc) 725 return; 726 727 spin_lock_bh(&im->mca_lock); 728 spin_lock_init(&pmc->mca_lock); 729 pmc->idev = im->idev; 730 in6_dev_hold(idev); 731 pmc->mca_addr = im->mca_addr; 732 pmc->mca_crcount = idev->mc_qrv; 733 pmc->mca_sfmode = im->mca_sfmode; 734 if (pmc->mca_sfmode == MCAST_INCLUDE) { 735 struct ip6_sf_list *psf; 736 737 pmc->mca_tomb = im->mca_tomb; 738 pmc->mca_sources = im->mca_sources; 739 im->mca_tomb = im->mca_sources = NULL; 740 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 741 psf->sf_crcount = pmc->mca_crcount; 742 } 743 spin_unlock_bh(&im->mca_lock); 744 745 spin_lock_bh(&idev->mc_lock); 746 pmc->next = idev->mc_tomb; 747 idev->mc_tomb = pmc; 748 spin_unlock_bh(&idev->mc_lock); 749 } 750 751 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca) 752 { 753 struct ifmcaddr6 *pmc, *pmc_prev; 754 struct ip6_sf_list *psf, *psf_next; 755 756 spin_lock_bh(&idev->mc_lock); 757 pmc_prev = NULL; 758 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 759 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 760 break; 761 pmc_prev = pmc; 762 } 763 if (pmc) { 764 if (pmc_prev) 765 pmc_prev->next = pmc->next; 766 else 767 idev->mc_tomb = pmc->next; 768 } 769 spin_unlock_bh(&idev->mc_lock); 770 771 if (pmc) { 772 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 773 psf_next = psf->sf_next; 774 kfree(psf); 775 } 776 in6_dev_put(pmc->idev); 777 kfree(pmc); 778 } 779 } 780 781 static void mld_clear_delrec(struct inet6_dev *idev) 782 { 783 struct ifmcaddr6 *pmc, *nextpmc; 784 785 spin_lock_bh(&idev->mc_lock); 786 pmc = idev->mc_tomb; 787 idev->mc_tomb = NULL; 788 spin_unlock_bh(&idev->mc_lock); 789 790 for (; pmc; pmc = nextpmc) { 791 nextpmc = pmc->next; 792 ip6_mc_clear_src(pmc); 793 in6_dev_put(pmc->idev); 794 kfree(pmc); 795 } 796 797 /* clear dead sources, too */ 798 read_lock_bh(&idev->lock); 799 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 800 struct ip6_sf_list *psf, *psf_next; 801 802 spin_lock_bh(&pmc->mca_lock); 803 psf = pmc->mca_tomb; 804 pmc->mca_tomb = NULL; 805 spin_unlock_bh(&pmc->mca_lock); 806 for (; psf; psf=psf_next) { 807 psf_next = psf->sf_next; 808 kfree(psf); 809 } 810 } 811 read_unlock_bh(&idev->lock); 812 } 813 814 815 /* 816 * device multicast group inc (add if not found) 817 */ 818 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 819 { 820 struct ifmcaddr6 *mc; 821 struct inet6_dev *idev; 822 823 /* we need to take a reference on idev */ 824 idev = in6_dev_get(dev); 825 826 if (idev == NULL) 827 return -EINVAL; 828 829 write_lock_bh(&idev->lock); 830 if (idev->dead) { 831 write_unlock_bh(&idev->lock); 832 in6_dev_put(idev); 833 return -ENODEV; 834 } 835 836 for (mc = idev->mc_list; mc; mc = mc->next) { 837 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 838 mc->mca_users++; 839 write_unlock_bh(&idev->lock); 840 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 841 NULL, 0); 842 in6_dev_put(idev); 843 return 0; 844 } 845 } 846 847 /* 848 * not found: create a new one. 849 */ 850 851 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 852 853 if (mc == NULL) { 854 write_unlock_bh(&idev->lock); 855 in6_dev_put(idev); 856 return -ENOMEM; 857 } 858 859 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 860 861 mc->mca_addr = *addr; 862 mc->idev = idev; /* (reference taken) */ 863 mc->mca_users = 1; 864 /* mca_stamp should be updated upon changes */ 865 mc->mca_cstamp = mc->mca_tstamp = jiffies; 866 atomic_set(&mc->mca_refcnt, 2); 867 spin_lock_init(&mc->mca_lock); 868 869 /* initial mode is (EX, empty) */ 870 mc->mca_sfmode = MCAST_EXCLUDE; 871 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 872 873 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 874 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 875 mc->mca_flags |= MAF_NOREPORT; 876 877 mc->next = idev->mc_list; 878 idev->mc_list = mc; 879 write_unlock_bh(&idev->lock); 880 881 mld_del_delrec(idev, &mc->mca_addr); 882 igmp6_group_added(mc); 883 ma_put(mc); 884 return 0; 885 } 886 887 /* 888 * device multicast group del 889 */ 890 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 891 { 892 struct ifmcaddr6 *ma, **map; 893 894 write_lock_bh(&idev->lock); 895 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 896 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 897 if (--ma->mca_users == 0) { 898 *map = ma->next; 899 write_unlock_bh(&idev->lock); 900 901 igmp6_group_dropped(ma); 902 903 ma_put(ma); 904 return 0; 905 } 906 write_unlock_bh(&idev->lock); 907 return 0; 908 } 909 } 910 write_unlock_bh(&idev->lock); 911 912 return -ENOENT; 913 } 914 915 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 916 { 917 struct inet6_dev *idev; 918 int err; 919 920 rcu_read_lock(); 921 922 idev = __in6_dev_get(dev); 923 if (!idev) 924 err = -ENODEV; 925 else 926 err = __ipv6_dev_mc_dec(idev, addr); 927 928 rcu_read_unlock(); 929 return err; 930 } 931 932 /* 933 * identify MLD packets for MLD filter exceptions 934 */ 935 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 936 { 937 struct icmp6hdr *pic; 938 939 if (nexthdr != IPPROTO_ICMPV6) 940 return 0; 941 942 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 943 return 0; 944 945 pic = icmp6_hdr(skb); 946 947 switch (pic->icmp6_type) { 948 case ICMPV6_MGM_QUERY: 949 case ICMPV6_MGM_REPORT: 950 case ICMPV6_MGM_REDUCTION: 951 case ICMPV6_MLD2_REPORT: 952 return 1; 953 default: 954 break; 955 } 956 return 0; 957 } 958 959 /* 960 * check if the interface/address pair is valid 961 */ 962 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 963 const struct in6_addr *src_addr) 964 { 965 struct inet6_dev *idev; 966 struct ifmcaddr6 *mc; 967 int rv = 0; 968 969 rcu_read_lock(); 970 idev = __in6_dev_get(dev); 971 if (idev) { 972 read_lock_bh(&idev->lock); 973 for (mc = idev->mc_list; mc; mc=mc->next) { 974 if (ipv6_addr_equal(&mc->mca_addr, group)) 975 break; 976 } 977 if (mc) { 978 if (src_addr && !ipv6_addr_any(src_addr)) { 979 struct ip6_sf_list *psf; 980 981 spin_lock_bh(&mc->mca_lock); 982 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 983 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 984 break; 985 } 986 if (psf) 987 rv = psf->sf_count[MCAST_INCLUDE] || 988 psf->sf_count[MCAST_EXCLUDE] != 989 mc->mca_sfcount[MCAST_EXCLUDE]; 990 else 991 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 992 spin_unlock_bh(&mc->mca_lock); 993 } else 994 rv = 1; /* don't filter unspecified source */ 995 } 996 read_unlock_bh(&idev->lock); 997 } 998 rcu_read_unlock(); 999 return rv; 1000 } 1001 1002 static void mld_gq_start_timer(struct inet6_dev *idev) 1003 { 1004 int tv = net_random() % idev->mc_maxdelay; 1005 1006 idev->mc_gq_running = 1; 1007 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1008 in6_dev_hold(idev); 1009 } 1010 1011 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1012 { 1013 int tv = net_random() % delay; 1014 1015 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1016 in6_dev_hold(idev); 1017 } 1018 1019 /* 1020 * IGMP handling (alias multicast ICMPv6 messages) 1021 */ 1022 1023 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1024 { 1025 unsigned long delay = resptime; 1026 1027 /* Do not start timer for these addresses */ 1028 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1029 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1030 return; 1031 1032 if (del_timer(&ma->mca_timer)) { 1033 atomic_dec(&ma->mca_refcnt); 1034 delay = ma->mca_timer.expires - jiffies; 1035 } 1036 1037 if (delay >= resptime) { 1038 if (resptime) 1039 delay = net_random() % resptime; 1040 else 1041 delay = 1; 1042 } 1043 ma->mca_timer.expires = jiffies + delay; 1044 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1045 atomic_inc(&ma->mca_refcnt); 1046 ma->mca_flags |= MAF_TIMER_RUNNING; 1047 } 1048 1049 /* mark EXCLUDE-mode sources */ 1050 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1051 const struct in6_addr *srcs) 1052 { 1053 struct ip6_sf_list *psf; 1054 int i, scount; 1055 1056 scount = 0; 1057 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1058 if (scount == nsrcs) 1059 break; 1060 for (i=0; i<nsrcs; i++) { 1061 /* skip inactive filters */ 1062 if (psf->sf_count[MCAST_INCLUDE] || 1063 pmc->mca_sfcount[MCAST_EXCLUDE] != 1064 psf->sf_count[MCAST_EXCLUDE]) 1065 continue; 1066 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1067 scount++; 1068 break; 1069 } 1070 } 1071 } 1072 pmc->mca_flags &= ~MAF_GSQUERY; 1073 if (scount == nsrcs) /* all sources excluded */ 1074 return 0; 1075 return 1; 1076 } 1077 1078 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1079 const struct in6_addr *srcs) 1080 { 1081 struct ip6_sf_list *psf; 1082 int i, scount; 1083 1084 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1085 return mld_xmarksources(pmc, nsrcs, srcs); 1086 1087 /* mark INCLUDE-mode sources */ 1088 1089 scount = 0; 1090 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1091 if (scount == nsrcs) 1092 break; 1093 for (i=0; i<nsrcs; i++) { 1094 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1095 psf->sf_gsresp = 1; 1096 scount++; 1097 break; 1098 } 1099 } 1100 } 1101 if (!scount) { 1102 pmc->mca_flags &= ~MAF_GSQUERY; 1103 return 0; 1104 } 1105 pmc->mca_flags |= MAF_GSQUERY; 1106 return 1; 1107 } 1108 1109 /* called with rcu_read_lock() */ 1110 int igmp6_event_query(struct sk_buff *skb) 1111 { 1112 struct mld2_query *mlh2 = NULL; 1113 struct ifmcaddr6 *ma; 1114 const struct in6_addr *group; 1115 unsigned long max_delay; 1116 struct inet6_dev *idev; 1117 struct mld_msg *mld; 1118 int group_type; 1119 int mark = 0; 1120 int len; 1121 1122 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1123 return -EINVAL; 1124 1125 /* compute payload length excluding extension headers */ 1126 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1127 len -= skb_network_header_len(skb); 1128 1129 /* Drop queries with not link local source */ 1130 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1131 return -EINVAL; 1132 1133 idev = __in6_dev_get(skb->dev); 1134 1135 if (idev == NULL) 1136 return 0; 1137 1138 mld = (struct mld_msg *)icmp6_hdr(skb); 1139 group = &mld->mld_mca; 1140 group_type = ipv6_addr_type(group); 1141 1142 if (group_type != IPV6_ADDR_ANY && 1143 !(group_type&IPV6_ADDR_MULTICAST)) 1144 return -EINVAL; 1145 1146 if (len == 24) { 1147 int switchback; 1148 /* MLDv1 router present */ 1149 1150 /* Translate milliseconds to jiffies */ 1151 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000; 1152 1153 switchback = (idev->mc_qrv + 1) * max_delay; 1154 idev->mc_v1_seen = jiffies + switchback; 1155 1156 /* cancel the interface change timer */ 1157 idev->mc_ifc_count = 0; 1158 if (del_timer(&idev->mc_ifc_timer)) 1159 __in6_dev_put(idev); 1160 /* clear deleted report items */ 1161 mld_clear_delrec(idev); 1162 } else if (len >= 28) { 1163 int srcs_offset = sizeof(struct mld2_query) - 1164 sizeof(struct icmp6hdr); 1165 if (!pskb_may_pull(skb, srcs_offset)) 1166 return -EINVAL; 1167 1168 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1169 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000; 1170 if (!max_delay) 1171 max_delay = 1; 1172 idev->mc_maxdelay = max_delay; 1173 if (mlh2->mld2q_qrv) 1174 idev->mc_qrv = mlh2->mld2q_qrv; 1175 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1176 if (mlh2->mld2q_nsrcs) 1177 return -EINVAL; /* no sources allowed */ 1178 1179 mld_gq_start_timer(idev); 1180 return 0; 1181 } 1182 /* mark sources to include, if group & source-specific */ 1183 if (mlh2->mld2q_nsrcs != 0) { 1184 if (!pskb_may_pull(skb, srcs_offset + 1185 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1186 return -EINVAL; 1187 1188 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1189 mark = 1; 1190 } 1191 } else 1192 return -EINVAL; 1193 1194 read_lock_bh(&idev->lock); 1195 if (group_type == IPV6_ADDR_ANY) { 1196 for (ma = idev->mc_list; ma; ma=ma->next) { 1197 spin_lock_bh(&ma->mca_lock); 1198 igmp6_group_queried(ma, max_delay); 1199 spin_unlock_bh(&ma->mca_lock); 1200 } 1201 } else { 1202 for (ma = idev->mc_list; ma; ma=ma->next) { 1203 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1204 continue; 1205 spin_lock_bh(&ma->mca_lock); 1206 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1207 /* gsquery <- gsquery && mark */ 1208 if (!mark) 1209 ma->mca_flags &= ~MAF_GSQUERY; 1210 } else { 1211 /* gsquery <- mark */ 1212 if (mark) 1213 ma->mca_flags |= MAF_GSQUERY; 1214 else 1215 ma->mca_flags &= ~MAF_GSQUERY; 1216 } 1217 if (!(ma->mca_flags & MAF_GSQUERY) || 1218 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1219 igmp6_group_queried(ma, max_delay); 1220 spin_unlock_bh(&ma->mca_lock); 1221 break; 1222 } 1223 } 1224 read_unlock_bh(&idev->lock); 1225 1226 return 0; 1227 } 1228 1229 /* called with rcu_read_lock() */ 1230 int igmp6_event_report(struct sk_buff *skb) 1231 { 1232 struct ifmcaddr6 *ma; 1233 struct inet6_dev *idev; 1234 struct mld_msg *mld; 1235 int addr_type; 1236 1237 /* Our own report looped back. Ignore it. */ 1238 if (skb->pkt_type == PACKET_LOOPBACK) 1239 return 0; 1240 1241 /* send our report if the MC router may not have heard this report */ 1242 if (skb->pkt_type != PACKET_MULTICAST && 1243 skb->pkt_type != PACKET_BROADCAST) 1244 return 0; 1245 1246 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1247 return -EINVAL; 1248 1249 mld = (struct mld_msg *)icmp6_hdr(skb); 1250 1251 /* Drop reports with not link local source */ 1252 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1253 if (addr_type != IPV6_ADDR_ANY && 1254 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1255 return -EINVAL; 1256 1257 idev = __in6_dev_get(skb->dev); 1258 if (idev == NULL) 1259 return -ENODEV; 1260 1261 /* 1262 * Cancel the timer for this group 1263 */ 1264 1265 read_lock_bh(&idev->lock); 1266 for (ma = idev->mc_list; ma; ma=ma->next) { 1267 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1268 spin_lock(&ma->mca_lock); 1269 if (del_timer(&ma->mca_timer)) 1270 atomic_dec(&ma->mca_refcnt); 1271 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1272 spin_unlock(&ma->mca_lock); 1273 break; 1274 } 1275 } 1276 read_unlock_bh(&idev->lock); 1277 return 0; 1278 } 1279 1280 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1281 int gdeleted, int sdeleted) 1282 { 1283 switch (type) { 1284 case MLD2_MODE_IS_INCLUDE: 1285 case MLD2_MODE_IS_EXCLUDE: 1286 if (gdeleted || sdeleted) 1287 return 0; 1288 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1289 if (pmc->mca_sfmode == MCAST_INCLUDE) 1290 return 1; 1291 /* don't include if this source is excluded 1292 * in all filters 1293 */ 1294 if (psf->sf_count[MCAST_INCLUDE]) 1295 return type == MLD2_MODE_IS_INCLUDE; 1296 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1297 psf->sf_count[MCAST_EXCLUDE]; 1298 } 1299 return 0; 1300 case MLD2_CHANGE_TO_INCLUDE: 1301 if (gdeleted || sdeleted) 1302 return 0; 1303 return psf->sf_count[MCAST_INCLUDE] != 0; 1304 case MLD2_CHANGE_TO_EXCLUDE: 1305 if (gdeleted || sdeleted) 1306 return 0; 1307 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1308 psf->sf_count[MCAST_INCLUDE]) 1309 return 0; 1310 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1311 psf->sf_count[MCAST_EXCLUDE]; 1312 case MLD2_ALLOW_NEW_SOURCES: 1313 if (gdeleted || !psf->sf_crcount) 1314 return 0; 1315 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1316 case MLD2_BLOCK_OLD_SOURCES: 1317 if (pmc->mca_sfmode == MCAST_INCLUDE) 1318 return gdeleted || (psf->sf_crcount && sdeleted); 1319 return psf->sf_crcount && !gdeleted && !sdeleted; 1320 } 1321 return 0; 1322 } 1323 1324 static int 1325 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1326 { 1327 struct ip6_sf_list *psf; 1328 int scount = 0; 1329 1330 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1331 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1332 continue; 1333 scount++; 1334 } 1335 return scount; 1336 } 1337 1338 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1339 { 1340 struct net *net = dev_net(dev); 1341 struct sock *sk = net->ipv6.igmp_sk; 1342 struct sk_buff *skb; 1343 struct mld2_report *pmr; 1344 struct in6_addr addr_buf; 1345 const struct in6_addr *saddr; 1346 int hlen = LL_RESERVED_SPACE(dev); 1347 int tlen = dev->needed_tailroom; 1348 int err; 1349 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1350 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1351 IPV6_TLV_PADN, 0 }; 1352 1353 /* we assume size > sizeof(ra) here */ 1354 size += hlen + tlen; 1355 /* limit our allocations to order-0 page */ 1356 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1357 skb = sock_alloc_send_skb(sk, size, 1, &err); 1358 1359 if (!skb) 1360 return NULL; 1361 1362 skb_reserve(skb, hlen); 1363 1364 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1365 /* <draft-ietf-magma-mld-source-05.txt>: 1366 * use unspecified address as the source address 1367 * when a valid link-local address is not available. 1368 */ 1369 saddr = &in6addr_any; 1370 } else 1371 saddr = &addr_buf; 1372 1373 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1374 1375 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1376 1377 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1378 skb_put(skb, sizeof(*pmr)); 1379 pmr = (struct mld2_report *)skb_transport_header(skb); 1380 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1381 pmr->mld2r_resv1 = 0; 1382 pmr->mld2r_cksum = 0; 1383 pmr->mld2r_resv2 = 0; 1384 pmr->mld2r_ngrec = 0; 1385 return skb; 1386 } 1387 1388 static void mld_sendpack(struct sk_buff *skb) 1389 { 1390 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1391 struct mld2_report *pmr = 1392 (struct mld2_report *)skb_transport_header(skb); 1393 int payload_len, mldlen; 1394 struct inet6_dev *idev; 1395 struct net *net = dev_net(skb->dev); 1396 int err; 1397 struct flowi6 fl6; 1398 struct dst_entry *dst; 1399 1400 rcu_read_lock(); 1401 idev = __in6_dev_get(skb->dev); 1402 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1403 1404 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1405 mldlen = skb->tail - skb->transport_header; 1406 pip6->payload_len = htons(payload_len); 1407 1408 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1409 IPPROTO_ICMPV6, 1410 csum_partial(skb_transport_header(skb), 1411 mldlen, 0)); 1412 1413 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1414 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1415 skb->dev->ifindex); 1416 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6); 1417 1418 err = 0; 1419 if (IS_ERR(dst)) { 1420 err = PTR_ERR(dst); 1421 dst = NULL; 1422 } 1423 skb_dst_set(skb, dst); 1424 if (err) 1425 goto err_out; 1426 1427 payload_len = skb->len; 1428 1429 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1430 dst_output); 1431 out: 1432 if (!err) { 1433 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1434 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1435 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1436 } else 1437 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1438 1439 rcu_read_unlock(); 1440 return; 1441 1442 err_out: 1443 kfree_skb(skb); 1444 goto out; 1445 } 1446 1447 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1448 { 1449 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1450 } 1451 1452 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1453 int type, struct mld2_grec **ppgr) 1454 { 1455 struct net_device *dev = pmc->idev->dev; 1456 struct mld2_report *pmr; 1457 struct mld2_grec *pgr; 1458 1459 if (!skb) 1460 skb = mld_newpack(dev, dev->mtu); 1461 if (!skb) 1462 return NULL; 1463 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1464 pgr->grec_type = type; 1465 pgr->grec_auxwords = 0; 1466 pgr->grec_nsrcs = 0; 1467 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1468 pmr = (struct mld2_report *)skb_transport_header(skb); 1469 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1470 *ppgr = pgr; 1471 return skb; 1472 } 1473 1474 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1475 skb_tailroom(skb)) : 0) 1476 1477 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1478 int type, int gdeleted, int sdeleted) 1479 { 1480 struct net_device *dev = pmc->idev->dev; 1481 struct mld2_report *pmr; 1482 struct mld2_grec *pgr = NULL; 1483 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1484 int scount, stotal, first, isquery, truncate; 1485 1486 if (pmc->mca_flags & MAF_NOREPORT) 1487 return skb; 1488 1489 isquery = type == MLD2_MODE_IS_INCLUDE || 1490 type == MLD2_MODE_IS_EXCLUDE; 1491 truncate = type == MLD2_MODE_IS_EXCLUDE || 1492 type == MLD2_CHANGE_TO_EXCLUDE; 1493 1494 stotal = scount = 0; 1495 1496 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1497 1498 if (!*psf_list) 1499 goto empty_source; 1500 1501 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1502 1503 /* EX and TO_EX get a fresh packet, if needed */ 1504 if (truncate) { 1505 if (pmr && pmr->mld2r_ngrec && 1506 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1507 if (skb) 1508 mld_sendpack(skb); 1509 skb = mld_newpack(dev, dev->mtu); 1510 } 1511 } 1512 first = 1; 1513 psf_prev = NULL; 1514 for (psf=*psf_list; psf; psf=psf_next) { 1515 struct in6_addr *psrc; 1516 1517 psf_next = psf->sf_next; 1518 1519 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1520 psf_prev = psf; 1521 continue; 1522 } 1523 1524 /* clear marks on query responses */ 1525 if (isquery) 1526 psf->sf_gsresp = 0; 1527 1528 if (AVAILABLE(skb) < sizeof(*psrc) + 1529 first*sizeof(struct mld2_grec)) { 1530 if (truncate && !first) 1531 break; /* truncate these */ 1532 if (pgr) 1533 pgr->grec_nsrcs = htons(scount); 1534 if (skb) 1535 mld_sendpack(skb); 1536 skb = mld_newpack(dev, dev->mtu); 1537 first = 1; 1538 scount = 0; 1539 } 1540 if (first) { 1541 skb = add_grhead(skb, pmc, type, &pgr); 1542 first = 0; 1543 } 1544 if (!skb) 1545 return NULL; 1546 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1547 *psrc = psf->sf_addr; 1548 scount++; stotal++; 1549 if ((type == MLD2_ALLOW_NEW_SOURCES || 1550 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1551 psf->sf_crcount--; 1552 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1553 if (psf_prev) 1554 psf_prev->sf_next = psf->sf_next; 1555 else 1556 *psf_list = psf->sf_next; 1557 kfree(psf); 1558 continue; 1559 } 1560 } 1561 psf_prev = psf; 1562 } 1563 1564 empty_source: 1565 if (!stotal) { 1566 if (type == MLD2_ALLOW_NEW_SOURCES || 1567 type == MLD2_BLOCK_OLD_SOURCES) 1568 return skb; 1569 if (pmc->mca_crcount || isquery) { 1570 /* make sure we have room for group header */ 1571 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1572 mld_sendpack(skb); 1573 skb = NULL; /* add_grhead will get a new one */ 1574 } 1575 skb = add_grhead(skb, pmc, type, &pgr); 1576 } 1577 } 1578 if (pgr) 1579 pgr->grec_nsrcs = htons(scount); 1580 1581 if (isquery) 1582 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1583 return skb; 1584 } 1585 1586 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1587 { 1588 struct sk_buff *skb = NULL; 1589 int type; 1590 1591 if (!pmc) { 1592 read_lock_bh(&idev->lock); 1593 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1594 if (pmc->mca_flags & MAF_NOREPORT) 1595 continue; 1596 spin_lock_bh(&pmc->mca_lock); 1597 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1598 type = MLD2_MODE_IS_EXCLUDE; 1599 else 1600 type = MLD2_MODE_IS_INCLUDE; 1601 skb = add_grec(skb, pmc, type, 0, 0); 1602 spin_unlock_bh(&pmc->mca_lock); 1603 } 1604 read_unlock_bh(&idev->lock); 1605 } else { 1606 spin_lock_bh(&pmc->mca_lock); 1607 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1608 type = MLD2_MODE_IS_EXCLUDE; 1609 else 1610 type = MLD2_MODE_IS_INCLUDE; 1611 skb = add_grec(skb, pmc, type, 0, 0); 1612 spin_unlock_bh(&pmc->mca_lock); 1613 } 1614 if (skb) 1615 mld_sendpack(skb); 1616 } 1617 1618 /* 1619 * remove zero-count source records from a source filter list 1620 */ 1621 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1622 { 1623 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1624 1625 psf_prev = NULL; 1626 for (psf=*ppsf; psf; psf = psf_next) { 1627 psf_next = psf->sf_next; 1628 if (psf->sf_crcount == 0) { 1629 if (psf_prev) 1630 psf_prev->sf_next = psf->sf_next; 1631 else 1632 *ppsf = psf->sf_next; 1633 kfree(psf); 1634 } else 1635 psf_prev = psf; 1636 } 1637 } 1638 1639 static void mld_send_cr(struct inet6_dev *idev) 1640 { 1641 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1642 struct sk_buff *skb = NULL; 1643 int type, dtype; 1644 1645 read_lock_bh(&idev->lock); 1646 spin_lock(&idev->mc_lock); 1647 1648 /* deleted MCA's */ 1649 pmc_prev = NULL; 1650 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1651 pmc_next = pmc->next; 1652 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1653 type = MLD2_BLOCK_OLD_SOURCES; 1654 dtype = MLD2_BLOCK_OLD_SOURCES; 1655 skb = add_grec(skb, pmc, type, 1, 0); 1656 skb = add_grec(skb, pmc, dtype, 1, 1); 1657 } 1658 if (pmc->mca_crcount) { 1659 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1660 type = MLD2_CHANGE_TO_INCLUDE; 1661 skb = add_grec(skb, pmc, type, 1, 0); 1662 } 1663 pmc->mca_crcount--; 1664 if (pmc->mca_crcount == 0) { 1665 mld_clear_zeros(&pmc->mca_tomb); 1666 mld_clear_zeros(&pmc->mca_sources); 1667 } 1668 } 1669 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1670 !pmc->mca_sources) { 1671 if (pmc_prev) 1672 pmc_prev->next = pmc_next; 1673 else 1674 idev->mc_tomb = pmc_next; 1675 in6_dev_put(pmc->idev); 1676 kfree(pmc); 1677 } else 1678 pmc_prev = pmc; 1679 } 1680 spin_unlock(&idev->mc_lock); 1681 1682 /* change recs */ 1683 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1684 spin_lock_bh(&pmc->mca_lock); 1685 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1686 type = MLD2_BLOCK_OLD_SOURCES; 1687 dtype = MLD2_ALLOW_NEW_SOURCES; 1688 } else { 1689 type = MLD2_ALLOW_NEW_SOURCES; 1690 dtype = MLD2_BLOCK_OLD_SOURCES; 1691 } 1692 skb = add_grec(skb, pmc, type, 0, 0); 1693 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1694 1695 /* filter mode changes */ 1696 if (pmc->mca_crcount) { 1697 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1698 type = MLD2_CHANGE_TO_EXCLUDE; 1699 else 1700 type = MLD2_CHANGE_TO_INCLUDE; 1701 skb = add_grec(skb, pmc, type, 0, 0); 1702 pmc->mca_crcount--; 1703 } 1704 spin_unlock_bh(&pmc->mca_lock); 1705 } 1706 read_unlock_bh(&idev->lock); 1707 if (!skb) 1708 return; 1709 (void) mld_sendpack(skb); 1710 } 1711 1712 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1713 { 1714 struct net *net = dev_net(dev); 1715 struct sock *sk = net->ipv6.igmp_sk; 1716 struct inet6_dev *idev; 1717 struct sk_buff *skb; 1718 struct mld_msg *hdr; 1719 const struct in6_addr *snd_addr, *saddr; 1720 struct in6_addr addr_buf; 1721 int hlen = LL_RESERVED_SPACE(dev); 1722 int tlen = dev->needed_tailroom; 1723 int err, len, payload_len, full_len; 1724 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1725 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1726 IPV6_TLV_PADN, 0 }; 1727 struct flowi6 fl6; 1728 struct dst_entry *dst; 1729 1730 if (type == ICMPV6_MGM_REDUCTION) 1731 snd_addr = &in6addr_linklocal_allrouters; 1732 else 1733 snd_addr = addr; 1734 1735 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1736 payload_len = len + sizeof(ra); 1737 full_len = sizeof(struct ipv6hdr) + payload_len; 1738 1739 rcu_read_lock(); 1740 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1741 IPSTATS_MIB_OUT, full_len); 1742 rcu_read_unlock(); 1743 1744 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1745 1746 if (skb == NULL) { 1747 rcu_read_lock(); 1748 IP6_INC_STATS(net, __in6_dev_get(dev), 1749 IPSTATS_MIB_OUTDISCARDS); 1750 rcu_read_unlock(); 1751 return; 1752 } 1753 1754 skb_reserve(skb, hlen); 1755 1756 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1757 /* <draft-ietf-magma-mld-source-05.txt>: 1758 * use unspecified address as the source address 1759 * when a valid link-local address is not available. 1760 */ 1761 saddr = &in6addr_any; 1762 } else 1763 saddr = &addr_buf; 1764 1765 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1766 1767 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1768 1769 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1770 memset(hdr, 0, sizeof(struct mld_msg)); 1771 hdr->mld_type = type; 1772 hdr->mld_mca = *addr; 1773 1774 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1775 IPPROTO_ICMPV6, 1776 csum_partial(hdr, len, 0)); 1777 1778 rcu_read_lock(); 1779 idev = __in6_dev_get(skb->dev); 1780 1781 icmpv6_flow_init(sk, &fl6, type, 1782 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1783 skb->dev->ifindex); 1784 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6); 1785 if (IS_ERR(dst)) { 1786 err = PTR_ERR(dst); 1787 goto err_out; 1788 } 1789 1790 skb_dst_set(skb, dst); 1791 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1792 dst_output); 1793 out: 1794 if (!err) { 1795 ICMP6MSGOUT_INC_STATS(net, idev, type); 1796 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1797 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1798 } else 1799 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1800 1801 rcu_read_unlock(); 1802 return; 1803 1804 err_out: 1805 kfree_skb(skb); 1806 goto out; 1807 } 1808 1809 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1810 const struct in6_addr *psfsrc) 1811 { 1812 struct ip6_sf_list *psf, *psf_prev; 1813 int rv = 0; 1814 1815 psf_prev = NULL; 1816 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1817 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1818 break; 1819 psf_prev = psf; 1820 } 1821 if (!psf || psf->sf_count[sfmode] == 0) { 1822 /* source filter not found, or count wrong => bug */ 1823 return -ESRCH; 1824 } 1825 psf->sf_count[sfmode]--; 1826 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1827 struct inet6_dev *idev = pmc->idev; 1828 1829 /* no more filters for this source */ 1830 if (psf_prev) 1831 psf_prev->sf_next = psf->sf_next; 1832 else 1833 pmc->mca_sources = psf->sf_next; 1834 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1835 !MLD_V1_SEEN(idev)) { 1836 psf->sf_crcount = idev->mc_qrv; 1837 psf->sf_next = pmc->mca_tomb; 1838 pmc->mca_tomb = psf; 1839 rv = 1; 1840 } else 1841 kfree(psf); 1842 } 1843 return rv; 1844 } 1845 1846 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 1847 int sfmode, int sfcount, const struct in6_addr *psfsrc, 1848 int delta) 1849 { 1850 struct ifmcaddr6 *pmc; 1851 int changerec = 0; 1852 int i, err; 1853 1854 if (!idev) 1855 return -ENODEV; 1856 read_lock_bh(&idev->lock); 1857 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1858 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1859 break; 1860 } 1861 if (!pmc) { 1862 /* MCA not found?? bug */ 1863 read_unlock_bh(&idev->lock); 1864 return -ESRCH; 1865 } 1866 spin_lock_bh(&pmc->mca_lock); 1867 sf_markstate(pmc); 1868 if (!delta) { 1869 if (!pmc->mca_sfcount[sfmode]) { 1870 spin_unlock_bh(&pmc->mca_lock); 1871 read_unlock_bh(&idev->lock); 1872 return -EINVAL; 1873 } 1874 pmc->mca_sfcount[sfmode]--; 1875 } 1876 err = 0; 1877 for (i=0; i<sfcount; i++) { 1878 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1879 1880 changerec |= rv > 0; 1881 if (!err && rv < 0) 1882 err = rv; 1883 } 1884 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1885 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1886 pmc->mca_sfcount[MCAST_INCLUDE]) { 1887 struct ip6_sf_list *psf; 1888 1889 /* filter mode change */ 1890 pmc->mca_sfmode = MCAST_INCLUDE; 1891 pmc->mca_crcount = idev->mc_qrv; 1892 idev->mc_ifc_count = pmc->mca_crcount; 1893 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1894 psf->sf_crcount = 0; 1895 mld_ifc_event(pmc->idev); 1896 } else if (sf_setstate(pmc) || changerec) 1897 mld_ifc_event(pmc->idev); 1898 spin_unlock_bh(&pmc->mca_lock); 1899 read_unlock_bh(&idev->lock); 1900 return err; 1901 } 1902 1903 /* 1904 * Add multicast single-source filter to the interface list 1905 */ 1906 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1907 const struct in6_addr *psfsrc) 1908 { 1909 struct ip6_sf_list *psf, *psf_prev; 1910 1911 psf_prev = NULL; 1912 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1913 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1914 break; 1915 psf_prev = psf; 1916 } 1917 if (!psf) { 1918 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1919 if (!psf) 1920 return -ENOBUFS; 1921 1922 psf->sf_addr = *psfsrc; 1923 if (psf_prev) { 1924 psf_prev->sf_next = psf; 1925 } else 1926 pmc->mca_sources = psf; 1927 } 1928 psf->sf_count[sfmode]++; 1929 return 0; 1930 } 1931 1932 static void sf_markstate(struct ifmcaddr6 *pmc) 1933 { 1934 struct ip6_sf_list *psf; 1935 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1936 1937 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1938 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1939 psf->sf_oldin = mca_xcount == 1940 psf->sf_count[MCAST_EXCLUDE] && 1941 !psf->sf_count[MCAST_INCLUDE]; 1942 } else 1943 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1944 } 1945 1946 static int sf_setstate(struct ifmcaddr6 *pmc) 1947 { 1948 struct ip6_sf_list *psf, *dpsf; 1949 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1950 int qrv = pmc->idev->mc_qrv; 1951 int new_in, rv; 1952 1953 rv = 0; 1954 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1955 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1956 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1957 !psf->sf_count[MCAST_INCLUDE]; 1958 } else 1959 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1960 if (new_in) { 1961 if (!psf->sf_oldin) { 1962 struct ip6_sf_list *prev = NULL; 1963 1964 for (dpsf=pmc->mca_tomb; dpsf; 1965 dpsf=dpsf->sf_next) { 1966 if (ipv6_addr_equal(&dpsf->sf_addr, 1967 &psf->sf_addr)) 1968 break; 1969 prev = dpsf; 1970 } 1971 if (dpsf) { 1972 if (prev) 1973 prev->sf_next = dpsf->sf_next; 1974 else 1975 pmc->mca_tomb = dpsf->sf_next; 1976 kfree(dpsf); 1977 } 1978 psf->sf_crcount = qrv; 1979 rv++; 1980 } 1981 } else if (psf->sf_oldin) { 1982 psf->sf_crcount = 0; 1983 /* 1984 * add or update "delete" records if an active filter 1985 * is now inactive 1986 */ 1987 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 1988 if (ipv6_addr_equal(&dpsf->sf_addr, 1989 &psf->sf_addr)) 1990 break; 1991 if (!dpsf) { 1992 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1993 if (!dpsf) 1994 continue; 1995 *dpsf = *psf; 1996 /* pmc->mca_lock held by callers */ 1997 dpsf->sf_next = pmc->mca_tomb; 1998 pmc->mca_tomb = dpsf; 1999 } 2000 dpsf->sf_crcount = qrv; 2001 rv++; 2002 } 2003 } 2004 return rv; 2005 } 2006 2007 /* 2008 * Add multicast source filter list to the interface list 2009 */ 2010 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2011 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2012 int delta) 2013 { 2014 struct ifmcaddr6 *pmc; 2015 int isexclude; 2016 int i, err; 2017 2018 if (!idev) 2019 return -ENODEV; 2020 read_lock_bh(&idev->lock); 2021 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2022 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2023 break; 2024 } 2025 if (!pmc) { 2026 /* MCA not found?? bug */ 2027 read_unlock_bh(&idev->lock); 2028 return -ESRCH; 2029 } 2030 spin_lock_bh(&pmc->mca_lock); 2031 2032 sf_markstate(pmc); 2033 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2034 if (!delta) 2035 pmc->mca_sfcount[sfmode]++; 2036 err = 0; 2037 for (i=0; i<sfcount; i++) { 2038 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2039 if (err) 2040 break; 2041 } 2042 if (err) { 2043 int j; 2044 2045 if (!delta) 2046 pmc->mca_sfcount[sfmode]--; 2047 for (j=0; j<i; j++) 2048 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2049 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2050 struct ip6_sf_list *psf; 2051 2052 /* filter mode change */ 2053 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2054 pmc->mca_sfmode = MCAST_EXCLUDE; 2055 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2056 pmc->mca_sfmode = MCAST_INCLUDE; 2057 /* else no filters; keep old mode for reports */ 2058 2059 pmc->mca_crcount = idev->mc_qrv; 2060 idev->mc_ifc_count = pmc->mca_crcount; 2061 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2062 psf->sf_crcount = 0; 2063 mld_ifc_event(idev); 2064 } else if (sf_setstate(pmc)) 2065 mld_ifc_event(idev); 2066 spin_unlock_bh(&pmc->mca_lock); 2067 read_unlock_bh(&idev->lock); 2068 return err; 2069 } 2070 2071 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2072 { 2073 struct ip6_sf_list *psf, *nextpsf; 2074 2075 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2076 nextpsf = psf->sf_next; 2077 kfree(psf); 2078 } 2079 pmc->mca_tomb = NULL; 2080 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2081 nextpsf = psf->sf_next; 2082 kfree(psf); 2083 } 2084 pmc->mca_sources = NULL; 2085 pmc->mca_sfmode = MCAST_EXCLUDE; 2086 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2087 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2088 } 2089 2090 2091 static void igmp6_join_group(struct ifmcaddr6 *ma) 2092 { 2093 unsigned long delay; 2094 2095 if (ma->mca_flags & MAF_NOREPORT) 2096 return; 2097 2098 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2099 2100 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2101 2102 spin_lock_bh(&ma->mca_lock); 2103 if (del_timer(&ma->mca_timer)) { 2104 atomic_dec(&ma->mca_refcnt); 2105 delay = ma->mca_timer.expires - jiffies; 2106 } 2107 2108 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2109 atomic_inc(&ma->mca_refcnt); 2110 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2111 spin_unlock_bh(&ma->mca_lock); 2112 } 2113 2114 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2115 struct inet6_dev *idev) 2116 { 2117 int err; 2118 2119 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2120 * so no other readers or writers of iml or its sflist 2121 */ 2122 if (!iml->sflist) { 2123 /* any-source empty exclude case */ 2124 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2125 } 2126 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2127 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2128 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2129 iml->sflist = NULL; 2130 return err; 2131 } 2132 2133 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2134 { 2135 if (MLD_V1_SEEN(ma->idev)) { 2136 if (ma->mca_flags & MAF_LAST_REPORTER) 2137 igmp6_send(&ma->mca_addr, ma->idev->dev, 2138 ICMPV6_MGM_REDUCTION); 2139 } else { 2140 mld_add_delrec(ma->idev, ma); 2141 mld_ifc_event(ma->idev); 2142 } 2143 } 2144 2145 static void mld_gq_timer_expire(unsigned long data) 2146 { 2147 struct inet6_dev *idev = (struct inet6_dev *)data; 2148 2149 idev->mc_gq_running = 0; 2150 mld_send_report(idev, NULL); 2151 __in6_dev_put(idev); 2152 } 2153 2154 static void mld_ifc_timer_expire(unsigned long data) 2155 { 2156 struct inet6_dev *idev = (struct inet6_dev *)data; 2157 2158 mld_send_cr(idev); 2159 if (idev->mc_ifc_count) { 2160 idev->mc_ifc_count--; 2161 if (idev->mc_ifc_count) 2162 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2163 } 2164 __in6_dev_put(idev); 2165 } 2166 2167 static void mld_ifc_event(struct inet6_dev *idev) 2168 { 2169 if (MLD_V1_SEEN(idev)) 2170 return; 2171 idev->mc_ifc_count = idev->mc_qrv; 2172 mld_ifc_start_timer(idev, 1); 2173 } 2174 2175 2176 static void igmp6_timer_handler(unsigned long data) 2177 { 2178 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2179 2180 if (MLD_V1_SEEN(ma->idev)) 2181 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2182 else 2183 mld_send_report(ma->idev, ma); 2184 2185 spin_lock(&ma->mca_lock); 2186 ma->mca_flags |= MAF_LAST_REPORTER; 2187 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2188 spin_unlock(&ma->mca_lock); 2189 ma_put(ma); 2190 } 2191 2192 /* Device changing type */ 2193 2194 void ipv6_mc_unmap(struct inet6_dev *idev) 2195 { 2196 struct ifmcaddr6 *i; 2197 2198 /* Install multicast list, except for all-nodes (already installed) */ 2199 2200 read_lock_bh(&idev->lock); 2201 for (i = idev->mc_list; i; i = i->next) 2202 igmp6_group_dropped(i); 2203 read_unlock_bh(&idev->lock); 2204 } 2205 2206 void ipv6_mc_remap(struct inet6_dev *idev) 2207 { 2208 ipv6_mc_up(idev); 2209 } 2210 2211 /* Device going down */ 2212 2213 void ipv6_mc_down(struct inet6_dev *idev) 2214 { 2215 struct ifmcaddr6 *i; 2216 2217 /* Withdraw multicast list */ 2218 2219 read_lock_bh(&idev->lock); 2220 idev->mc_ifc_count = 0; 2221 if (del_timer(&idev->mc_ifc_timer)) 2222 __in6_dev_put(idev); 2223 idev->mc_gq_running = 0; 2224 if (del_timer(&idev->mc_gq_timer)) 2225 __in6_dev_put(idev); 2226 2227 for (i = idev->mc_list; i; i=i->next) 2228 igmp6_group_dropped(i); 2229 read_unlock_bh(&idev->lock); 2230 2231 mld_clear_delrec(idev); 2232 } 2233 2234 2235 /* Device going up */ 2236 2237 void ipv6_mc_up(struct inet6_dev *idev) 2238 { 2239 struct ifmcaddr6 *i; 2240 2241 /* Install multicast list, except for all-nodes (already installed) */ 2242 2243 read_lock_bh(&idev->lock); 2244 for (i = idev->mc_list; i; i=i->next) 2245 igmp6_group_added(i); 2246 read_unlock_bh(&idev->lock); 2247 } 2248 2249 /* IPv6 device initialization. */ 2250 2251 void ipv6_mc_init_dev(struct inet6_dev *idev) 2252 { 2253 write_lock_bh(&idev->lock); 2254 spin_lock_init(&idev->mc_lock); 2255 idev->mc_gq_running = 0; 2256 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2257 (unsigned long)idev); 2258 idev->mc_tomb = NULL; 2259 idev->mc_ifc_count = 0; 2260 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2261 (unsigned long)idev); 2262 idev->mc_qrv = MLD_QRV_DEFAULT; 2263 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2264 idev->mc_v1_seen = 0; 2265 write_unlock_bh(&idev->lock); 2266 } 2267 2268 /* 2269 * Device is about to be destroyed: clean up. 2270 */ 2271 2272 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2273 { 2274 struct ifmcaddr6 *i; 2275 2276 /* Deactivate timers */ 2277 ipv6_mc_down(idev); 2278 2279 /* Delete all-nodes address. */ 2280 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2281 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2282 * fail. 2283 */ 2284 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2285 2286 if (idev->cnf.forwarding) 2287 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2288 2289 write_lock_bh(&idev->lock); 2290 while ((i = idev->mc_list) != NULL) { 2291 idev->mc_list = i->next; 2292 write_unlock_bh(&idev->lock); 2293 2294 igmp6_group_dropped(i); 2295 ma_put(i); 2296 2297 write_lock_bh(&idev->lock); 2298 } 2299 write_unlock_bh(&idev->lock); 2300 } 2301 2302 #ifdef CONFIG_PROC_FS 2303 struct igmp6_mc_iter_state { 2304 struct seq_net_private p; 2305 struct net_device *dev; 2306 struct inet6_dev *idev; 2307 }; 2308 2309 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2310 2311 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2312 { 2313 struct ifmcaddr6 *im = NULL; 2314 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2315 struct net *net = seq_file_net(seq); 2316 2317 state->idev = NULL; 2318 for_each_netdev_rcu(net, state->dev) { 2319 struct inet6_dev *idev; 2320 idev = __in6_dev_get(state->dev); 2321 if (!idev) 2322 continue; 2323 read_lock_bh(&idev->lock); 2324 im = idev->mc_list; 2325 if (im) { 2326 state->idev = idev; 2327 break; 2328 } 2329 read_unlock_bh(&idev->lock); 2330 } 2331 return im; 2332 } 2333 2334 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2335 { 2336 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2337 2338 im = im->next; 2339 while (!im) { 2340 if (likely(state->idev != NULL)) 2341 read_unlock_bh(&state->idev->lock); 2342 2343 state->dev = next_net_device_rcu(state->dev); 2344 if (!state->dev) { 2345 state->idev = NULL; 2346 break; 2347 } 2348 state->idev = __in6_dev_get(state->dev); 2349 if (!state->idev) 2350 continue; 2351 read_lock_bh(&state->idev->lock); 2352 im = state->idev->mc_list; 2353 } 2354 return im; 2355 } 2356 2357 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2358 { 2359 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2360 if (im) 2361 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2362 --pos; 2363 return pos ? NULL : im; 2364 } 2365 2366 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2367 __acquires(RCU) 2368 { 2369 rcu_read_lock(); 2370 return igmp6_mc_get_idx(seq, *pos); 2371 } 2372 2373 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2374 { 2375 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2376 2377 ++*pos; 2378 return im; 2379 } 2380 2381 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2382 __releases(RCU) 2383 { 2384 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2385 2386 if (likely(state->idev != NULL)) { 2387 read_unlock_bh(&state->idev->lock); 2388 state->idev = NULL; 2389 } 2390 state->dev = NULL; 2391 rcu_read_unlock(); 2392 } 2393 2394 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2395 { 2396 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2398 2399 seq_printf(seq, 2400 "%-4d %-15s %pi6 %5d %08X %ld\n", 2401 state->dev->ifindex, state->dev->name, 2402 &im->mca_addr, 2403 im->mca_users, im->mca_flags, 2404 (im->mca_flags&MAF_TIMER_RUNNING) ? 2405 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2406 return 0; 2407 } 2408 2409 static const struct seq_operations igmp6_mc_seq_ops = { 2410 .start = igmp6_mc_seq_start, 2411 .next = igmp6_mc_seq_next, 2412 .stop = igmp6_mc_seq_stop, 2413 .show = igmp6_mc_seq_show, 2414 }; 2415 2416 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2417 { 2418 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2419 sizeof(struct igmp6_mc_iter_state)); 2420 } 2421 2422 static const struct file_operations igmp6_mc_seq_fops = { 2423 .owner = THIS_MODULE, 2424 .open = igmp6_mc_seq_open, 2425 .read = seq_read, 2426 .llseek = seq_lseek, 2427 .release = seq_release_net, 2428 }; 2429 2430 struct igmp6_mcf_iter_state { 2431 struct seq_net_private p; 2432 struct net_device *dev; 2433 struct inet6_dev *idev; 2434 struct ifmcaddr6 *im; 2435 }; 2436 2437 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2438 2439 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2440 { 2441 struct ip6_sf_list *psf = NULL; 2442 struct ifmcaddr6 *im = NULL; 2443 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2444 struct net *net = seq_file_net(seq); 2445 2446 state->idev = NULL; 2447 state->im = NULL; 2448 for_each_netdev_rcu(net, state->dev) { 2449 struct inet6_dev *idev; 2450 idev = __in6_dev_get(state->dev); 2451 if (unlikely(idev == NULL)) 2452 continue; 2453 read_lock_bh(&idev->lock); 2454 im = idev->mc_list; 2455 if (likely(im != NULL)) { 2456 spin_lock_bh(&im->mca_lock); 2457 psf = im->mca_sources; 2458 if (likely(psf != NULL)) { 2459 state->im = im; 2460 state->idev = idev; 2461 break; 2462 } 2463 spin_unlock_bh(&im->mca_lock); 2464 } 2465 read_unlock_bh(&idev->lock); 2466 } 2467 return psf; 2468 } 2469 2470 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2471 { 2472 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2473 2474 psf = psf->sf_next; 2475 while (!psf) { 2476 spin_unlock_bh(&state->im->mca_lock); 2477 state->im = state->im->next; 2478 while (!state->im) { 2479 if (likely(state->idev != NULL)) 2480 read_unlock_bh(&state->idev->lock); 2481 2482 state->dev = next_net_device_rcu(state->dev); 2483 if (!state->dev) { 2484 state->idev = NULL; 2485 goto out; 2486 } 2487 state->idev = __in6_dev_get(state->dev); 2488 if (!state->idev) 2489 continue; 2490 read_lock_bh(&state->idev->lock); 2491 state->im = state->idev->mc_list; 2492 } 2493 if (!state->im) 2494 break; 2495 spin_lock_bh(&state->im->mca_lock); 2496 psf = state->im->mca_sources; 2497 } 2498 out: 2499 return psf; 2500 } 2501 2502 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2503 { 2504 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2505 if (psf) 2506 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2507 --pos; 2508 return pos ? NULL : psf; 2509 } 2510 2511 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2512 __acquires(RCU) 2513 { 2514 rcu_read_lock(); 2515 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2516 } 2517 2518 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2519 { 2520 struct ip6_sf_list *psf; 2521 if (v == SEQ_START_TOKEN) 2522 psf = igmp6_mcf_get_first(seq); 2523 else 2524 psf = igmp6_mcf_get_next(seq, v); 2525 ++*pos; 2526 return psf; 2527 } 2528 2529 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2530 __releases(RCU) 2531 { 2532 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2533 if (likely(state->im != NULL)) { 2534 spin_unlock_bh(&state->im->mca_lock); 2535 state->im = NULL; 2536 } 2537 if (likely(state->idev != NULL)) { 2538 read_unlock_bh(&state->idev->lock); 2539 state->idev = NULL; 2540 } 2541 state->dev = NULL; 2542 rcu_read_unlock(); 2543 } 2544 2545 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2546 { 2547 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2548 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2549 2550 if (v == SEQ_START_TOKEN) { 2551 seq_printf(seq, 2552 "%3s %6s " 2553 "%32s %32s %6s %6s\n", "Idx", 2554 "Device", "Multicast Address", 2555 "Source Address", "INC", "EXC"); 2556 } else { 2557 seq_printf(seq, 2558 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2559 state->dev->ifindex, state->dev->name, 2560 &state->im->mca_addr, 2561 &psf->sf_addr, 2562 psf->sf_count[MCAST_INCLUDE], 2563 psf->sf_count[MCAST_EXCLUDE]); 2564 } 2565 return 0; 2566 } 2567 2568 static const struct seq_operations igmp6_mcf_seq_ops = { 2569 .start = igmp6_mcf_seq_start, 2570 .next = igmp6_mcf_seq_next, 2571 .stop = igmp6_mcf_seq_stop, 2572 .show = igmp6_mcf_seq_show, 2573 }; 2574 2575 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2576 { 2577 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2578 sizeof(struct igmp6_mcf_iter_state)); 2579 } 2580 2581 static const struct file_operations igmp6_mcf_seq_fops = { 2582 .owner = THIS_MODULE, 2583 .open = igmp6_mcf_seq_open, 2584 .read = seq_read, 2585 .llseek = seq_lseek, 2586 .release = seq_release_net, 2587 }; 2588 2589 static int __net_init igmp6_proc_init(struct net *net) 2590 { 2591 int err; 2592 2593 err = -ENOMEM; 2594 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2595 goto out; 2596 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2597 &igmp6_mcf_seq_fops)) 2598 goto out_proc_net_igmp6; 2599 2600 err = 0; 2601 out: 2602 return err; 2603 2604 out_proc_net_igmp6: 2605 proc_net_remove(net, "igmp6"); 2606 goto out; 2607 } 2608 2609 static void __net_exit igmp6_proc_exit(struct net *net) 2610 { 2611 proc_net_remove(net, "mcfilter6"); 2612 proc_net_remove(net, "igmp6"); 2613 } 2614 #else 2615 static inline int igmp6_proc_init(struct net *net) 2616 { 2617 return 0; 2618 } 2619 static inline void igmp6_proc_exit(struct net *net) 2620 { 2621 } 2622 #endif 2623 2624 static int __net_init igmp6_net_init(struct net *net) 2625 { 2626 int err; 2627 2628 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2629 SOCK_RAW, IPPROTO_ICMPV6, net); 2630 if (err < 0) { 2631 printk(KERN_ERR 2632 "Failed to initialize the IGMP6 control socket (err %d).\n", 2633 err); 2634 goto out; 2635 } 2636 2637 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2638 2639 err = igmp6_proc_init(net); 2640 if (err) 2641 goto out_sock_create; 2642 out: 2643 return err; 2644 2645 out_sock_create: 2646 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2647 goto out; 2648 } 2649 2650 static void __net_exit igmp6_net_exit(struct net *net) 2651 { 2652 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2653 igmp6_proc_exit(net); 2654 } 2655 2656 static struct pernet_operations igmp6_net_ops = { 2657 .init = igmp6_net_init, 2658 .exit = igmp6_net_exit, 2659 }; 2660 2661 int __init igmp6_init(void) 2662 { 2663 return register_pernet_subsys(&igmp6_net_ops); 2664 } 2665 2666 void igmp6_cleanup(void) 2667 { 2668 unregister_pernet_subsys(&igmp6_net_ops); 2669 } 2670