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 net_device *dev; 323 struct inet6_dev *idev; 324 struct ipv6_pinfo *inet6 = inet6_sk(sk); 325 struct ip6_sf_socklist *psl; 326 struct net *net = sock_net(sk); 327 int i, j, rv; 328 int leavegroup = 0; 329 int pmclocked = 0; 330 int err; 331 332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 334 335 if (!ipv6_addr_is_multicast(group)) 336 return -EINVAL; 337 338 rcu_read_lock(); 339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 340 if (!idev) { 341 rcu_read_unlock(); 342 return -ENODEV; 343 } 344 dev = idev->dev; 345 346 err = -EADDRNOTAVAIL; 347 348 for_each_pmc_rcu(inet6, pmc) { 349 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 350 continue; 351 if (ipv6_addr_equal(&pmc->addr, group)) 352 break; 353 } 354 if (!pmc) { /* must have a prior join */ 355 err = -EINVAL; 356 goto done; 357 } 358 /* if a source filter was set, must be the same mode as before */ 359 if (pmc->sflist) { 360 if (pmc->sfmode != omode) { 361 err = -EINVAL; 362 goto done; 363 } 364 } else if (pmc->sfmode != omode) { 365 /* allow mode switches for empty-set filters */ 366 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 367 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 368 pmc->sfmode = omode; 369 } 370 371 write_lock(&pmc->sflock); 372 pmclocked = 1; 373 374 psl = pmc->sflist; 375 if (!add) { 376 if (!psl) 377 goto done; /* err = -EADDRNOTAVAIL */ 378 rv = !0; 379 for (i=0; i<psl->sl_count; i++) { 380 rv = memcmp(&psl->sl_addr[i], source, 381 sizeof(struct in6_addr)); 382 if (rv == 0) 383 break; 384 } 385 if (rv) /* source not found */ 386 goto done; /* err = -EADDRNOTAVAIL */ 387 388 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 389 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 390 leavegroup = 1; 391 goto done; 392 } 393 394 /* update the interface filter */ 395 ip6_mc_del_src(idev, group, omode, 1, source, 1); 396 397 for (j=i+1; j<psl->sl_count; j++) 398 psl->sl_addr[j-1] = psl->sl_addr[j]; 399 psl->sl_count--; 400 err = 0; 401 goto done; 402 } 403 /* else, add a new source to the filter */ 404 405 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 406 err = -ENOBUFS; 407 goto done; 408 } 409 if (!psl || psl->sl_count == psl->sl_max) { 410 struct ip6_sf_socklist *newpsl; 411 int count = IP6_SFBLOCK; 412 413 if (psl) 414 count += psl->sl_max; 415 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 416 if (!newpsl) { 417 err = -ENOBUFS; 418 goto done; 419 } 420 newpsl->sl_max = count; 421 newpsl->sl_count = count - IP6_SFBLOCK; 422 if (psl) { 423 for (i=0; i<psl->sl_count; i++) 424 newpsl->sl_addr[i] = psl->sl_addr[i]; 425 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 426 } 427 pmc->sflist = psl = newpsl; 428 } 429 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 430 for (i=0; i<psl->sl_count; i++) { 431 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 432 if (rv == 0) 433 break; 434 } 435 if (rv == 0) /* address already there is an error */ 436 goto done; 437 for (j=psl->sl_count-1; j>=i; j--) 438 psl->sl_addr[j+1] = psl->sl_addr[j]; 439 psl->sl_addr[i] = *source; 440 psl->sl_count++; 441 err = 0; 442 /* update the interface list */ 443 ip6_mc_add_src(idev, group, omode, 1, source, 1); 444 done: 445 if (pmclocked) 446 write_unlock(&pmc->sflock); 447 read_unlock_bh(&idev->lock); 448 rcu_read_unlock(); 449 if (leavegroup) 450 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 451 return err; 452 } 453 454 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 455 { 456 struct in6_addr *group; 457 struct ipv6_mc_socklist *pmc; 458 struct net_device *dev; 459 struct inet6_dev *idev; 460 struct ipv6_pinfo *inet6 = inet6_sk(sk); 461 struct ip6_sf_socklist *newpsl, *psl; 462 struct net *net = sock_net(sk); 463 int leavegroup = 0; 464 int i, err; 465 466 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 467 468 if (!ipv6_addr_is_multicast(group)) 469 return -EINVAL; 470 if (gsf->gf_fmode != MCAST_INCLUDE && 471 gsf->gf_fmode != MCAST_EXCLUDE) 472 return -EINVAL; 473 474 rcu_read_lock(); 475 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 476 477 if (!idev) { 478 rcu_read_unlock(); 479 return -ENODEV; 480 } 481 dev = idev->dev; 482 483 err = 0; 484 485 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 486 leavegroup = 1; 487 goto done; 488 } 489 490 for_each_pmc_rcu(inet6, pmc) { 491 if (pmc->ifindex != gsf->gf_interface) 492 continue; 493 if (ipv6_addr_equal(&pmc->addr, group)) 494 break; 495 } 496 if (!pmc) { /* must have a prior join */ 497 err = -EINVAL; 498 goto done; 499 } 500 if (gsf->gf_numsrc) { 501 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 502 GFP_ATOMIC); 503 if (!newpsl) { 504 err = -ENOBUFS; 505 goto done; 506 } 507 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 508 for (i=0; i<newpsl->sl_count; ++i) { 509 struct sockaddr_in6 *psin6; 510 511 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 512 newpsl->sl_addr[i] = psin6->sin6_addr; 513 } 514 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 515 newpsl->sl_count, newpsl->sl_addr, 0); 516 if (err) { 517 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 518 goto done; 519 } 520 } else { 521 newpsl = NULL; 522 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 523 } 524 525 write_lock(&pmc->sflock); 526 psl = pmc->sflist; 527 if (psl) { 528 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 529 psl->sl_count, psl->sl_addr, 0); 530 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 531 } else 532 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 533 pmc->sflist = newpsl; 534 pmc->sfmode = gsf->gf_fmode; 535 write_unlock(&pmc->sflock); 536 err = 0; 537 done: 538 read_unlock_bh(&idev->lock); 539 rcu_read_unlock(); 540 if (leavegroup) 541 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 542 return err; 543 } 544 545 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 546 struct group_filter __user *optval, int __user *optlen) 547 { 548 int err, i, count, copycount; 549 struct in6_addr *group; 550 struct ipv6_mc_socklist *pmc; 551 struct inet6_dev *idev; 552 struct net_device *dev; 553 struct ipv6_pinfo *inet6 = inet6_sk(sk); 554 struct ip6_sf_socklist *psl; 555 struct net *net = sock_net(sk); 556 557 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 558 559 if (!ipv6_addr_is_multicast(group)) 560 return -EINVAL; 561 562 rcu_read_lock(); 563 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 564 565 if (!idev) { 566 rcu_read_unlock(); 567 return -ENODEV; 568 } 569 dev = idev->dev; 570 571 err = -EADDRNOTAVAIL; 572 /* 573 * changes to the ipv6_mc_list require the socket lock and 574 * a read lock on ip6_sk_mc_lock. We have the socket lock, 575 * so reading the list is safe. 576 */ 577 578 for_each_pmc_rcu(inet6, pmc) { 579 if (pmc->ifindex != gsf->gf_interface) 580 continue; 581 if (ipv6_addr_equal(group, &pmc->addr)) 582 break; 583 } 584 if (!pmc) /* must have a prior join */ 585 goto done; 586 gsf->gf_fmode = pmc->sfmode; 587 psl = pmc->sflist; 588 count = psl ? psl->sl_count : 0; 589 read_unlock_bh(&idev->lock); 590 rcu_read_unlock(); 591 592 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 593 gsf->gf_numsrc = count; 594 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 595 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 596 return -EFAULT; 597 } 598 /* changes to psl require the socket lock, a read lock on 599 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 600 * have the socket lock, so reading here is safe. 601 */ 602 for (i=0; i<copycount; i++) { 603 struct sockaddr_in6 *psin6; 604 struct sockaddr_storage ss; 605 606 psin6 = (struct sockaddr_in6 *)&ss; 607 memset(&ss, 0, sizeof(ss)); 608 psin6->sin6_family = AF_INET6; 609 psin6->sin6_addr = psl->sl_addr[i]; 610 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 611 return -EFAULT; 612 } 613 return 0; 614 done: 615 read_unlock_bh(&idev->lock); 616 rcu_read_unlock(); 617 return err; 618 } 619 620 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 621 const struct in6_addr *src_addr) 622 { 623 struct ipv6_pinfo *np = inet6_sk(sk); 624 struct ipv6_mc_socklist *mc; 625 struct ip6_sf_socklist *psl; 626 int rv = 1; 627 628 rcu_read_lock(); 629 for_each_pmc_rcu(np, mc) { 630 if (ipv6_addr_equal(&mc->addr, mc_addr)) 631 break; 632 } 633 if (!mc) { 634 rcu_read_unlock(); 635 return 1; 636 } 637 read_lock(&mc->sflock); 638 psl = mc->sflist; 639 if (!psl) { 640 rv = mc->sfmode == MCAST_EXCLUDE; 641 } else { 642 int i; 643 644 for (i=0; i<psl->sl_count; i++) { 645 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 646 break; 647 } 648 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 649 rv = 0; 650 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 651 rv = 0; 652 } 653 read_unlock(&mc->sflock); 654 rcu_read_unlock(); 655 656 return rv; 657 } 658 659 static void ma_put(struct ifmcaddr6 *mc) 660 { 661 if (atomic_dec_and_test(&mc->mca_refcnt)) { 662 in6_dev_put(mc->idev); 663 kfree(mc); 664 } 665 } 666 667 static void igmp6_group_added(struct ifmcaddr6 *mc) 668 { 669 struct net_device *dev = mc->idev->dev; 670 char buf[MAX_ADDR_LEN]; 671 672 spin_lock_bh(&mc->mca_lock); 673 if (!(mc->mca_flags&MAF_LOADED)) { 674 mc->mca_flags |= MAF_LOADED; 675 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 676 dev_mc_add(dev, buf); 677 } 678 spin_unlock_bh(&mc->mca_lock); 679 680 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 681 return; 682 683 if (MLD_V1_SEEN(mc->idev)) { 684 igmp6_join_group(mc); 685 return; 686 } 687 /* else v2 */ 688 689 mc->mca_crcount = mc->idev->mc_qrv; 690 mld_ifc_event(mc->idev); 691 } 692 693 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 694 { 695 struct net_device *dev = mc->idev->dev; 696 char buf[MAX_ADDR_LEN]; 697 698 spin_lock_bh(&mc->mca_lock); 699 if (mc->mca_flags&MAF_LOADED) { 700 mc->mca_flags &= ~MAF_LOADED; 701 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 702 dev_mc_del(dev, buf); 703 } 704 705 if (mc->mca_flags & MAF_NOREPORT) 706 goto done; 707 spin_unlock_bh(&mc->mca_lock); 708 709 if (!mc->idev->dead) 710 igmp6_leave_group(mc); 711 712 spin_lock_bh(&mc->mca_lock); 713 if (del_timer(&mc->mca_timer)) 714 atomic_dec(&mc->mca_refcnt); 715 done: 716 ip6_mc_clear_src(mc); 717 spin_unlock_bh(&mc->mca_lock); 718 } 719 720 /* 721 * deleted ifmcaddr6 manipulation 722 */ 723 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 724 { 725 struct ifmcaddr6 *pmc; 726 727 /* this is an "ifmcaddr6" for convenience; only the fields below 728 * are actually used. In particular, the refcnt and users are not 729 * used for management of the delete list. Using the same structure 730 * for deleted items allows change reports to use common code with 731 * non-deleted or query-response MCA's. 732 */ 733 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 734 if (!pmc) 735 return; 736 737 spin_lock_bh(&im->mca_lock); 738 spin_lock_init(&pmc->mca_lock); 739 pmc->idev = im->idev; 740 in6_dev_hold(idev); 741 pmc->mca_addr = im->mca_addr; 742 pmc->mca_crcount = idev->mc_qrv; 743 pmc->mca_sfmode = im->mca_sfmode; 744 if (pmc->mca_sfmode == MCAST_INCLUDE) { 745 struct ip6_sf_list *psf; 746 747 pmc->mca_tomb = im->mca_tomb; 748 pmc->mca_sources = im->mca_sources; 749 im->mca_tomb = im->mca_sources = NULL; 750 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 751 psf->sf_crcount = pmc->mca_crcount; 752 } 753 spin_unlock_bh(&im->mca_lock); 754 755 spin_lock_bh(&idev->mc_lock); 756 pmc->next = idev->mc_tomb; 757 idev->mc_tomb = pmc; 758 spin_unlock_bh(&idev->mc_lock); 759 } 760 761 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 762 { 763 struct ifmcaddr6 *pmc, *pmc_prev; 764 struct ip6_sf_list *psf, *psf_next; 765 766 spin_lock_bh(&idev->mc_lock); 767 pmc_prev = NULL; 768 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 769 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 770 break; 771 pmc_prev = pmc; 772 } 773 if (pmc) { 774 if (pmc_prev) 775 pmc_prev->next = pmc->next; 776 else 777 idev->mc_tomb = pmc->next; 778 } 779 spin_unlock_bh(&idev->mc_lock); 780 781 if (pmc) { 782 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 783 psf_next = psf->sf_next; 784 kfree(psf); 785 } 786 in6_dev_put(pmc->idev); 787 kfree(pmc); 788 } 789 } 790 791 static void mld_clear_delrec(struct inet6_dev *idev) 792 { 793 struct ifmcaddr6 *pmc, *nextpmc; 794 795 spin_lock_bh(&idev->mc_lock); 796 pmc = idev->mc_tomb; 797 idev->mc_tomb = NULL; 798 spin_unlock_bh(&idev->mc_lock); 799 800 for (; pmc; pmc = nextpmc) { 801 nextpmc = pmc->next; 802 ip6_mc_clear_src(pmc); 803 in6_dev_put(pmc->idev); 804 kfree(pmc); 805 } 806 807 /* clear dead sources, too */ 808 read_lock_bh(&idev->lock); 809 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 810 struct ip6_sf_list *psf, *psf_next; 811 812 spin_lock_bh(&pmc->mca_lock); 813 psf = pmc->mca_tomb; 814 pmc->mca_tomb = NULL; 815 spin_unlock_bh(&pmc->mca_lock); 816 for (; psf; psf=psf_next) { 817 psf_next = psf->sf_next; 818 kfree(psf); 819 } 820 } 821 read_unlock_bh(&idev->lock); 822 } 823 824 825 /* 826 * device multicast group inc (add if not found) 827 */ 828 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 829 { 830 struct ifmcaddr6 *mc; 831 struct inet6_dev *idev; 832 833 /* we need to take a reference on idev */ 834 idev = in6_dev_get(dev); 835 836 if (idev == NULL) 837 return -EINVAL; 838 839 write_lock_bh(&idev->lock); 840 if (idev->dead) { 841 write_unlock_bh(&idev->lock); 842 in6_dev_put(idev); 843 return -ENODEV; 844 } 845 846 for (mc = idev->mc_list; mc; mc = mc->next) { 847 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 848 mc->mca_users++; 849 write_unlock_bh(&idev->lock); 850 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 851 NULL, 0); 852 in6_dev_put(idev); 853 return 0; 854 } 855 } 856 857 /* 858 * not found: create a new one. 859 */ 860 861 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 862 863 if (mc == NULL) { 864 write_unlock_bh(&idev->lock); 865 in6_dev_put(idev); 866 return -ENOMEM; 867 } 868 869 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 870 871 ipv6_addr_copy(&mc->mca_addr, addr); 872 mc->idev = idev; /* (reference taken) */ 873 mc->mca_users = 1; 874 /* mca_stamp should be updated upon changes */ 875 mc->mca_cstamp = mc->mca_tstamp = jiffies; 876 atomic_set(&mc->mca_refcnt, 2); 877 spin_lock_init(&mc->mca_lock); 878 879 /* initial mode is (EX, empty) */ 880 mc->mca_sfmode = MCAST_EXCLUDE; 881 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 882 883 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 884 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 885 mc->mca_flags |= MAF_NOREPORT; 886 887 mc->next = idev->mc_list; 888 idev->mc_list = mc; 889 write_unlock_bh(&idev->lock); 890 891 mld_del_delrec(idev, &mc->mca_addr); 892 igmp6_group_added(mc); 893 ma_put(mc); 894 return 0; 895 } 896 897 /* 898 * device multicast group del 899 */ 900 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 901 { 902 struct ifmcaddr6 *ma, **map; 903 904 write_lock_bh(&idev->lock); 905 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 906 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 907 if (--ma->mca_users == 0) { 908 *map = ma->next; 909 write_unlock_bh(&idev->lock); 910 911 igmp6_group_dropped(ma); 912 913 ma_put(ma); 914 return 0; 915 } 916 write_unlock_bh(&idev->lock); 917 return 0; 918 } 919 } 920 write_unlock_bh(&idev->lock); 921 922 return -ENOENT; 923 } 924 925 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 926 { 927 struct inet6_dev *idev; 928 int err; 929 930 rcu_read_lock(); 931 932 idev = __in6_dev_get(dev); 933 if (!idev) 934 err = -ENODEV; 935 else 936 err = __ipv6_dev_mc_dec(idev, addr); 937 938 rcu_read_unlock(); 939 return err; 940 } 941 942 /* 943 * identify MLD packets for MLD filter exceptions 944 */ 945 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 946 { 947 struct icmp6hdr *pic; 948 949 if (nexthdr != IPPROTO_ICMPV6) 950 return 0; 951 952 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 953 return 0; 954 955 pic = icmp6_hdr(skb); 956 957 switch (pic->icmp6_type) { 958 case ICMPV6_MGM_QUERY: 959 case ICMPV6_MGM_REPORT: 960 case ICMPV6_MGM_REDUCTION: 961 case ICMPV6_MLD2_REPORT: 962 return 1; 963 default: 964 break; 965 } 966 return 0; 967 } 968 969 /* 970 * check if the interface/address pair is valid 971 */ 972 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 973 const struct in6_addr *src_addr) 974 { 975 struct inet6_dev *idev; 976 struct ifmcaddr6 *mc; 977 int rv = 0; 978 979 rcu_read_lock(); 980 idev = __in6_dev_get(dev); 981 if (idev) { 982 read_lock_bh(&idev->lock); 983 for (mc = idev->mc_list; mc; mc=mc->next) { 984 if (ipv6_addr_equal(&mc->mca_addr, group)) 985 break; 986 } 987 if (mc) { 988 if (src_addr && !ipv6_addr_any(src_addr)) { 989 struct ip6_sf_list *psf; 990 991 spin_lock_bh(&mc->mca_lock); 992 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 993 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 994 break; 995 } 996 if (psf) 997 rv = psf->sf_count[MCAST_INCLUDE] || 998 psf->sf_count[MCAST_EXCLUDE] != 999 mc->mca_sfcount[MCAST_EXCLUDE]; 1000 else 1001 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1002 spin_unlock_bh(&mc->mca_lock); 1003 } else 1004 rv = 1; /* don't filter unspecified source */ 1005 } 1006 read_unlock_bh(&idev->lock); 1007 } 1008 rcu_read_unlock(); 1009 return rv; 1010 } 1011 1012 static void mld_gq_start_timer(struct inet6_dev *idev) 1013 { 1014 int tv = net_random() % idev->mc_maxdelay; 1015 1016 idev->mc_gq_running = 1; 1017 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1018 in6_dev_hold(idev); 1019 } 1020 1021 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1022 { 1023 int tv = net_random() % delay; 1024 1025 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1026 in6_dev_hold(idev); 1027 } 1028 1029 /* 1030 * IGMP handling (alias multicast ICMPv6 messages) 1031 */ 1032 1033 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1034 { 1035 unsigned long delay = resptime; 1036 1037 /* Do not start timer for these addresses */ 1038 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1039 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1040 return; 1041 1042 if (del_timer(&ma->mca_timer)) { 1043 atomic_dec(&ma->mca_refcnt); 1044 delay = ma->mca_timer.expires - jiffies; 1045 } 1046 1047 if (delay >= resptime) { 1048 if (resptime) 1049 delay = net_random() % resptime; 1050 else 1051 delay = 1; 1052 } 1053 ma->mca_timer.expires = jiffies + delay; 1054 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1055 atomic_inc(&ma->mca_refcnt); 1056 ma->mca_flags |= MAF_TIMER_RUNNING; 1057 } 1058 1059 /* mark EXCLUDE-mode sources */ 1060 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1061 struct in6_addr *srcs) 1062 { 1063 struct ip6_sf_list *psf; 1064 int i, scount; 1065 1066 scount = 0; 1067 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1068 if (scount == nsrcs) 1069 break; 1070 for (i=0; i<nsrcs; i++) { 1071 /* skip inactive filters */ 1072 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1073 pmc->mca_sfcount[MCAST_EXCLUDE] != 1074 psf->sf_count[MCAST_EXCLUDE]) 1075 continue; 1076 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1077 scount++; 1078 break; 1079 } 1080 } 1081 } 1082 pmc->mca_flags &= ~MAF_GSQUERY; 1083 if (scount == nsrcs) /* all sources excluded */ 1084 return 0; 1085 return 1; 1086 } 1087 1088 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1089 struct in6_addr *srcs) 1090 { 1091 struct ip6_sf_list *psf; 1092 int i, scount; 1093 1094 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1095 return mld_xmarksources(pmc, nsrcs, srcs); 1096 1097 /* mark INCLUDE-mode sources */ 1098 1099 scount = 0; 1100 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1101 if (scount == nsrcs) 1102 break; 1103 for (i=0; i<nsrcs; i++) { 1104 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1105 psf->sf_gsresp = 1; 1106 scount++; 1107 break; 1108 } 1109 } 1110 } 1111 if (!scount) { 1112 pmc->mca_flags &= ~MAF_GSQUERY; 1113 return 0; 1114 } 1115 pmc->mca_flags |= MAF_GSQUERY; 1116 return 1; 1117 } 1118 1119 /* called with rcu_read_lock() */ 1120 int igmp6_event_query(struct sk_buff *skb) 1121 { 1122 struct mld2_query *mlh2 = NULL; 1123 struct ifmcaddr6 *ma; 1124 struct in6_addr *group; 1125 unsigned long max_delay; 1126 struct inet6_dev *idev; 1127 struct mld_msg *mld; 1128 int group_type; 1129 int mark = 0; 1130 int len; 1131 1132 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1133 return -EINVAL; 1134 1135 /* compute payload length excluding extension headers */ 1136 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1137 len -= skb_network_header_len(skb); 1138 1139 /* Drop queries with not link local source */ 1140 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1141 return -EINVAL; 1142 1143 idev = __in6_dev_get(skb->dev); 1144 1145 if (idev == NULL) 1146 return 0; 1147 1148 mld = (struct mld_msg *)icmp6_hdr(skb); 1149 group = &mld->mld_mca; 1150 group_type = ipv6_addr_type(group); 1151 1152 if (group_type != IPV6_ADDR_ANY && 1153 !(group_type&IPV6_ADDR_MULTICAST)) 1154 return -EINVAL; 1155 1156 if (len == 24) { 1157 int switchback; 1158 /* MLDv1 router present */ 1159 1160 /* Translate milliseconds to jiffies */ 1161 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000; 1162 1163 switchback = (idev->mc_qrv + 1) * max_delay; 1164 idev->mc_v1_seen = jiffies + switchback; 1165 1166 /* cancel the interface change timer */ 1167 idev->mc_ifc_count = 0; 1168 if (del_timer(&idev->mc_ifc_timer)) 1169 __in6_dev_put(idev); 1170 /* clear deleted report items */ 1171 mld_clear_delrec(idev); 1172 } else if (len >= 28) { 1173 int srcs_offset = sizeof(struct mld2_query) - 1174 sizeof(struct icmp6hdr); 1175 if (!pskb_may_pull(skb, srcs_offset)) 1176 return -EINVAL; 1177 1178 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1179 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000; 1180 if (!max_delay) 1181 max_delay = 1; 1182 idev->mc_maxdelay = max_delay; 1183 if (mlh2->mld2q_qrv) 1184 idev->mc_qrv = mlh2->mld2q_qrv; 1185 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1186 if (mlh2->mld2q_nsrcs) 1187 return -EINVAL; /* no sources allowed */ 1188 1189 mld_gq_start_timer(idev); 1190 return 0; 1191 } 1192 /* mark sources to include, if group & source-specific */ 1193 if (mlh2->mld2q_nsrcs != 0) { 1194 if (!pskb_may_pull(skb, srcs_offset + 1195 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1196 return -EINVAL; 1197 1198 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1199 mark = 1; 1200 } 1201 } else 1202 return -EINVAL; 1203 1204 read_lock_bh(&idev->lock); 1205 if (group_type == IPV6_ADDR_ANY) { 1206 for (ma = idev->mc_list; ma; ma=ma->next) { 1207 spin_lock_bh(&ma->mca_lock); 1208 igmp6_group_queried(ma, max_delay); 1209 spin_unlock_bh(&ma->mca_lock); 1210 } 1211 } else { 1212 for (ma = idev->mc_list; ma; ma=ma->next) { 1213 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1214 continue; 1215 spin_lock_bh(&ma->mca_lock); 1216 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1217 /* gsquery <- gsquery && mark */ 1218 if (!mark) 1219 ma->mca_flags &= ~MAF_GSQUERY; 1220 } else { 1221 /* gsquery <- mark */ 1222 if (mark) 1223 ma->mca_flags |= MAF_GSQUERY; 1224 else 1225 ma->mca_flags &= ~MAF_GSQUERY; 1226 } 1227 if (!(ma->mca_flags & MAF_GSQUERY) || 1228 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1229 igmp6_group_queried(ma, max_delay); 1230 spin_unlock_bh(&ma->mca_lock); 1231 break; 1232 } 1233 } 1234 read_unlock_bh(&idev->lock); 1235 1236 return 0; 1237 } 1238 1239 /* called with rcu_read_lock() */ 1240 int igmp6_event_report(struct sk_buff *skb) 1241 { 1242 struct ifmcaddr6 *ma; 1243 struct inet6_dev *idev; 1244 struct mld_msg *mld; 1245 int addr_type; 1246 1247 /* Our own report looped back. Ignore it. */ 1248 if (skb->pkt_type == PACKET_LOOPBACK) 1249 return 0; 1250 1251 /* send our report if the MC router may not have heard this report */ 1252 if (skb->pkt_type != PACKET_MULTICAST && 1253 skb->pkt_type != PACKET_BROADCAST) 1254 return 0; 1255 1256 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1257 return -EINVAL; 1258 1259 mld = (struct mld_msg *)icmp6_hdr(skb); 1260 1261 /* Drop reports with not link local source */ 1262 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1263 if (addr_type != IPV6_ADDR_ANY && 1264 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1265 return -EINVAL; 1266 1267 idev = __in6_dev_get(skb->dev); 1268 if (idev == NULL) 1269 return -ENODEV; 1270 1271 /* 1272 * Cancel the timer for this group 1273 */ 1274 1275 read_lock_bh(&idev->lock); 1276 for (ma = idev->mc_list; ma; ma=ma->next) { 1277 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1278 spin_lock(&ma->mca_lock); 1279 if (del_timer(&ma->mca_timer)) 1280 atomic_dec(&ma->mca_refcnt); 1281 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1282 spin_unlock(&ma->mca_lock); 1283 break; 1284 } 1285 } 1286 read_unlock_bh(&idev->lock); 1287 return 0; 1288 } 1289 1290 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1291 int gdeleted, int sdeleted) 1292 { 1293 switch (type) { 1294 case MLD2_MODE_IS_INCLUDE: 1295 case MLD2_MODE_IS_EXCLUDE: 1296 if (gdeleted || sdeleted) 1297 return 0; 1298 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1299 if (pmc->mca_sfmode == MCAST_INCLUDE) 1300 return 1; 1301 /* don't include if this source is excluded 1302 * in all filters 1303 */ 1304 if (psf->sf_count[MCAST_INCLUDE]) 1305 return type == MLD2_MODE_IS_INCLUDE; 1306 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1307 psf->sf_count[MCAST_EXCLUDE]; 1308 } 1309 return 0; 1310 case MLD2_CHANGE_TO_INCLUDE: 1311 if (gdeleted || sdeleted) 1312 return 0; 1313 return psf->sf_count[MCAST_INCLUDE] != 0; 1314 case MLD2_CHANGE_TO_EXCLUDE: 1315 if (gdeleted || sdeleted) 1316 return 0; 1317 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1318 psf->sf_count[MCAST_INCLUDE]) 1319 return 0; 1320 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1321 psf->sf_count[MCAST_EXCLUDE]; 1322 case MLD2_ALLOW_NEW_SOURCES: 1323 if (gdeleted || !psf->sf_crcount) 1324 return 0; 1325 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1326 case MLD2_BLOCK_OLD_SOURCES: 1327 if (pmc->mca_sfmode == MCAST_INCLUDE) 1328 return gdeleted || (psf->sf_crcount && sdeleted); 1329 return psf->sf_crcount && !gdeleted && !sdeleted; 1330 } 1331 return 0; 1332 } 1333 1334 static int 1335 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1336 { 1337 struct ip6_sf_list *psf; 1338 int scount = 0; 1339 1340 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1341 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1342 continue; 1343 scount++; 1344 } 1345 return scount; 1346 } 1347 1348 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1349 { 1350 struct net *net = dev_net(dev); 1351 struct sock *sk = net->ipv6.igmp_sk; 1352 struct sk_buff *skb; 1353 struct mld2_report *pmr; 1354 struct in6_addr addr_buf; 1355 const struct in6_addr *saddr; 1356 int err; 1357 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1358 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1359 IPV6_TLV_PADN, 0 }; 1360 1361 /* we assume size > sizeof(ra) here */ 1362 size += LL_ALLOCATED_SPACE(dev); 1363 /* limit our allocations to order-0 page */ 1364 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1365 skb = sock_alloc_send_skb(sk, size, 1, &err); 1366 1367 if (!skb) 1368 return NULL; 1369 1370 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1371 1372 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1373 /* <draft-ietf-magma-mld-source-05.txt>: 1374 * use unspecified address as the source address 1375 * when a valid link-local address is not available. 1376 */ 1377 saddr = &in6addr_any; 1378 } else 1379 saddr = &addr_buf; 1380 1381 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1382 1383 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1384 1385 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1386 skb_put(skb, sizeof(*pmr)); 1387 pmr = (struct mld2_report *)skb_transport_header(skb); 1388 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1389 pmr->mld2r_resv1 = 0; 1390 pmr->mld2r_cksum = 0; 1391 pmr->mld2r_resv2 = 0; 1392 pmr->mld2r_ngrec = 0; 1393 return skb; 1394 } 1395 1396 static void mld_sendpack(struct sk_buff *skb) 1397 { 1398 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1399 struct mld2_report *pmr = 1400 (struct mld2_report *)skb_transport_header(skb); 1401 int payload_len, mldlen; 1402 struct inet6_dev *idev; 1403 struct net *net = dev_net(skb->dev); 1404 int err; 1405 struct flowi fl; 1406 struct dst_entry *dst; 1407 1408 rcu_read_lock(); 1409 idev = __in6_dev_get(skb->dev); 1410 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1411 1412 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1413 mldlen = skb->tail - skb->transport_header; 1414 pip6->payload_len = htons(payload_len); 1415 1416 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1417 IPPROTO_ICMPV6, 1418 csum_partial(skb_transport_header(skb), 1419 mldlen, 0)); 1420 1421 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1422 1423 if (!dst) { 1424 err = -ENOMEM; 1425 goto err_out; 1426 } 1427 1428 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT, 1429 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1430 skb->dev->ifindex); 1431 1432 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1433 skb_dst_set(skb, dst); 1434 if (err) 1435 goto err_out; 1436 1437 payload_len = skb->len; 1438 1439 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1440 dst_output); 1441 out: 1442 if (!err) { 1443 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1444 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1445 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1446 } else 1447 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1448 1449 rcu_read_unlock(); 1450 return; 1451 1452 err_out: 1453 kfree_skb(skb); 1454 goto out; 1455 } 1456 1457 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1458 { 1459 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1460 } 1461 1462 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1463 int type, struct mld2_grec **ppgr) 1464 { 1465 struct net_device *dev = pmc->idev->dev; 1466 struct mld2_report *pmr; 1467 struct mld2_grec *pgr; 1468 1469 if (!skb) 1470 skb = mld_newpack(dev, dev->mtu); 1471 if (!skb) 1472 return NULL; 1473 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1474 pgr->grec_type = type; 1475 pgr->grec_auxwords = 0; 1476 pgr->grec_nsrcs = 0; 1477 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1478 pmr = (struct mld2_report *)skb_transport_header(skb); 1479 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1480 *ppgr = pgr; 1481 return skb; 1482 } 1483 1484 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1485 skb_tailroom(skb)) : 0) 1486 1487 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1488 int type, int gdeleted, int sdeleted) 1489 { 1490 struct net_device *dev = pmc->idev->dev; 1491 struct mld2_report *pmr; 1492 struct mld2_grec *pgr = NULL; 1493 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1494 int scount, stotal, first, isquery, truncate; 1495 1496 if (pmc->mca_flags & MAF_NOREPORT) 1497 return skb; 1498 1499 isquery = type == MLD2_MODE_IS_INCLUDE || 1500 type == MLD2_MODE_IS_EXCLUDE; 1501 truncate = type == MLD2_MODE_IS_EXCLUDE || 1502 type == MLD2_CHANGE_TO_EXCLUDE; 1503 1504 stotal = scount = 0; 1505 1506 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1507 1508 if (!*psf_list) 1509 goto empty_source; 1510 1511 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1512 1513 /* EX and TO_EX get a fresh packet, if needed */ 1514 if (truncate) { 1515 if (pmr && pmr->mld2r_ngrec && 1516 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1517 if (skb) 1518 mld_sendpack(skb); 1519 skb = mld_newpack(dev, dev->mtu); 1520 } 1521 } 1522 first = 1; 1523 psf_prev = NULL; 1524 for (psf=*psf_list; psf; psf=psf_next) { 1525 struct in6_addr *psrc; 1526 1527 psf_next = psf->sf_next; 1528 1529 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1530 psf_prev = psf; 1531 continue; 1532 } 1533 1534 /* clear marks on query responses */ 1535 if (isquery) 1536 psf->sf_gsresp = 0; 1537 1538 if (AVAILABLE(skb) < sizeof(*psrc) + 1539 first*sizeof(struct mld2_grec)) { 1540 if (truncate && !first) 1541 break; /* truncate these */ 1542 if (pgr) 1543 pgr->grec_nsrcs = htons(scount); 1544 if (skb) 1545 mld_sendpack(skb); 1546 skb = mld_newpack(dev, dev->mtu); 1547 first = 1; 1548 scount = 0; 1549 } 1550 if (first) { 1551 skb = add_grhead(skb, pmc, type, &pgr); 1552 first = 0; 1553 } 1554 if (!skb) 1555 return NULL; 1556 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1557 *psrc = psf->sf_addr; 1558 scount++; stotal++; 1559 if ((type == MLD2_ALLOW_NEW_SOURCES || 1560 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1561 psf->sf_crcount--; 1562 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1563 if (psf_prev) 1564 psf_prev->sf_next = psf->sf_next; 1565 else 1566 *psf_list = psf->sf_next; 1567 kfree(psf); 1568 continue; 1569 } 1570 } 1571 psf_prev = psf; 1572 } 1573 1574 empty_source: 1575 if (!stotal) { 1576 if (type == MLD2_ALLOW_NEW_SOURCES || 1577 type == MLD2_BLOCK_OLD_SOURCES) 1578 return skb; 1579 if (pmc->mca_crcount || isquery) { 1580 /* make sure we have room for group header */ 1581 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1582 mld_sendpack(skb); 1583 skb = NULL; /* add_grhead will get a new one */ 1584 } 1585 skb = add_grhead(skb, pmc, type, &pgr); 1586 } 1587 } 1588 if (pgr) 1589 pgr->grec_nsrcs = htons(scount); 1590 1591 if (isquery) 1592 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1593 return skb; 1594 } 1595 1596 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1597 { 1598 struct sk_buff *skb = NULL; 1599 int type; 1600 1601 if (!pmc) { 1602 read_lock_bh(&idev->lock); 1603 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1604 if (pmc->mca_flags & MAF_NOREPORT) 1605 continue; 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 read_unlock_bh(&idev->lock); 1615 } else { 1616 spin_lock_bh(&pmc->mca_lock); 1617 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1618 type = MLD2_MODE_IS_EXCLUDE; 1619 else 1620 type = MLD2_MODE_IS_INCLUDE; 1621 skb = add_grec(skb, pmc, type, 0, 0); 1622 spin_unlock_bh(&pmc->mca_lock); 1623 } 1624 if (skb) 1625 mld_sendpack(skb); 1626 } 1627 1628 /* 1629 * remove zero-count source records from a source filter list 1630 */ 1631 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1632 { 1633 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1634 1635 psf_prev = NULL; 1636 for (psf=*ppsf; psf; psf = psf_next) { 1637 psf_next = psf->sf_next; 1638 if (psf->sf_crcount == 0) { 1639 if (psf_prev) 1640 psf_prev->sf_next = psf->sf_next; 1641 else 1642 *ppsf = psf->sf_next; 1643 kfree(psf); 1644 } else 1645 psf_prev = psf; 1646 } 1647 } 1648 1649 static void mld_send_cr(struct inet6_dev *idev) 1650 { 1651 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1652 struct sk_buff *skb = NULL; 1653 int type, dtype; 1654 1655 read_lock_bh(&idev->lock); 1656 spin_lock(&idev->mc_lock); 1657 1658 /* deleted MCA's */ 1659 pmc_prev = NULL; 1660 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1661 pmc_next = pmc->next; 1662 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1663 type = MLD2_BLOCK_OLD_SOURCES; 1664 dtype = MLD2_BLOCK_OLD_SOURCES; 1665 skb = add_grec(skb, pmc, type, 1, 0); 1666 skb = add_grec(skb, pmc, dtype, 1, 1); 1667 } 1668 if (pmc->mca_crcount) { 1669 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1670 type = MLD2_CHANGE_TO_INCLUDE; 1671 skb = add_grec(skb, pmc, type, 1, 0); 1672 } 1673 pmc->mca_crcount--; 1674 if (pmc->mca_crcount == 0) { 1675 mld_clear_zeros(&pmc->mca_tomb); 1676 mld_clear_zeros(&pmc->mca_sources); 1677 } 1678 } 1679 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1680 !pmc->mca_sources) { 1681 if (pmc_prev) 1682 pmc_prev->next = pmc_next; 1683 else 1684 idev->mc_tomb = pmc_next; 1685 in6_dev_put(pmc->idev); 1686 kfree(pmc); 1687 } else 1688 pmc_prev = pmc; 1689 } 1690 spin_unlock(&idev->mc_lock); 1691 1692 /* change recs */ 1693 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1694 spin_lock_bh(&pmc->mca_lock); 1695 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1696 type = MLD2_BLOCK_OLD_SOURCES; 1697 dtype = MLD2_ALLOW_NEW_SOURCES; 1698 } else { 1699 type = MLD2_ALLOW_NEW_SOURCES; 1700 dtype = MLD2_BLOCK_OLD_SOURCES; 1701 } 1702 skb = add_grec(skb, pmc, type, 0, 0); 1703 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1704 1705 /* filter mode changes */ 1706 if (pmc->mca_crcount) { 1707 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1708 type = MLD2_CHANGE_TO_EXCLUDE; 1709 else 1710 type = MLD2_CHANGE_TO_INCLUDE; 1711 skb = add_grec(skb, pmc, type, 0, 0); 1712 pmc->mca_crcount--; 1713 } 1714 spin_unlock_bh(&pmc->mca_lock); 1715 } 1716 read_unlock_bh(&idev->lock); 1717 if (!skb) 1718 return; 1719 (void) mld_sendpack(skb); 1720 } 1721 1722 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1723 { 1724 struct net *net = dev_net(dev); 1725 struct sock *sk = net->ipv6.igmp_sk; 1726 struct inet6_dev *idev; 1727 struct sk_buff *skb; 1728 struct mld_msg *hdr; 1729 const struct in6_addr *snd_addr, *saddr; 1730 struct in6_addr addr_buf; 1731 int err, len, payload_len, full_len; 1732 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1733 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1734 IPV6_TLV_PADN, 0 }; 1735 struct flowi fl; 1736 struct dst_entry *dst; 1737 1738 if (type == ICMPV6_MGM_REDUCTION) 1739 snd_addr = &in6addr_linklocal_allrouters; 1740 else 1741 snd_addr = addr; 1742 1743 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1744 payload_len = len + sizeof(ra); 1745 full_len = sizeof(struct ipv6hdr) + payload_len; 1746 1747 rcu_read_lock(); 1748 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1749 IPSTATS_MIB_OUT, full_len); 1750 rcu_read_unlock(); 1751 1752 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err); 1753 1754 if (skb == NULL) { 1755 rcu_read_lock(); 1756 IP6_INC_STATS(net, __in6_dev_get(dev), 1757 IPSTATS_MIB_OUTDISCARDS); 1758 rcu_read_unlock(); 1759 return; 1760 } 1761 1762 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1763 1764 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1765 /* <draft-ietf-magma-mld-source-05.txt>: 1766 * use unspecified address as the source address 1767 * when a valid link-local address is not available. 1768 */ 1769 saddr = &in6addr_any; 1770 } else 1771 saddr = &addr_buf; 1772 1773 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1774 1775 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1776 1777 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1778 memset(hdr, 0, sizeof(struct mld_msg)); 1779 hdr->mld_type = type; 1780 ipv6_addr_copy(&hdr->mld_mca, addr); 1781 1782 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1783 IPPROTO_ICMPV6, 1784 csum_partial(hdr, len, 0)); 1785 1786 rcu_read_lock(); 1787 idev = __in6_dev_get(skb->dev); 1788 1789 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1790 if (!dst) { 1791 err = -ENOMEM; 1792 goto err_out; 1793 } 1794 1795 icmpv6_flow_init(sk, &fl, type, 1796 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1797 skb->dev->ifindex); 1798 1799 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1800 if (err) 1801 goto err_out; 1802 1803 skb_dst_set(skb, dst); 1804 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1805 dst_output); 1806 out: 1807 if (!err) { 1808 ICMP6MSGOUT_INC_STATS(net, idev, type); 1809 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1810 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1811 } else 1812 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1813 1814 rcu_read_unlock(); 1815 return; 1816 1817 err_out: 1818 kfree_skb(skb); 1819 goto out; 1820 } 1821 1822 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1823 struct in6_addr *psfsrc) 1824 { 1825 struct ip6_sf_list *psf, *psf_prev; 1826 int rv = 0; 1827 1828 psf_prev = NULL; 1829 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1830 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1831 break; 1832 psf_prev = psf; 1833 } 1834 if (!psf || psf->sf_count[sfmode] == 0) { 1835 /* source filter not found, or count wrong => bug */ 1836 return -ESRCH; 1837 } 1838 psf->sf_count[sfmode]--; 1839 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1840 struct inet6_dev *idev = pmc->idev; 1841 1842 /* no more filters for this source */ 1843 if (psf_prev) 1844 psf_prev->sf_next = psf->sf_next; 1845 else 1846 pmc->mca_sources = psf->sf_next; 1847 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1848 !MLD_V1_SEEN(idev)) { 1849 psf->sf_crcount = idev->mc_qrv; 1850 psf->sf_next = pmc->mca_tomb; 1851 pmc->mca_tomb = psf; 1852 rv = 1; 1853 } else 1854 kfree(psf); 1855 } 1856 return rv; 1857 } 1858 1859 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1860 int sfmode, int sfcount, struct in6_addr *psfsrc, 1861 int delta) 1862 { 1863 struct ifmcaddr6 *pmc; 1864 int changerec = 0; 1865 int i, err; 1866 1867 if (!idev) 1868 return -ENODEV; 1869 read_lock_bh(&idev->lock); 1870 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1871 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1872 break; 1873 } 1874 if (!pmc) { 1875 /* MCA not found?? bug */ 1876 read_unlock_bh(&idev->lock); 1877 return -ESRCH; 1878 } 1879 spin_lock_bh(&pmc->mca_lock); 1880 sf_markstate(pmc); 1881 if (!delta) { 1882 if (!pmc->mca_sfcount[sfmode]) { 1883 spin_unlock_bh(&pmc->mca_lock); 1884 read_unlock_bh(&idev->lock); 1885 return -EINVAL; 1886 } 1887 pmc->mca_sfcount[sfmode]--; 1888 } 1889 err = 0; 1890 for (i=0; i<sfcount; i++) { 1891 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1892 1893 changerec |= rv > 0; 1894 if (!err && rv < 0) 1895 err = rv; 1896 } 1897 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1898 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1899 pmc->mca_sfcount[MCAST_INCLUDE]) { 1900 struct ip6_sf_list *psf; 1901 1902 /* filter mode change */ 1903 pmc->mca_sfmode = MCAST_INCLUDE; 1904 pmc->mca_crcount = idev->mc_qrv; 1905 idev->mc_ifc_count = pmc->mca_crcount; 1906 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1907 psf->sf_crcount = 0; 1908 mld_ifc_event(pmc->idev); 1909 } else if (sf_setstate(pmc) || changerec) 1910 mld_ifc_event(pmc->idev); 1911 spin_unlock_bh(&pmc->mca_lock); 1912 read_unlock_bh(&idev->lock); 1913 return err; 1914 } 1915 1916 /* 1917 * Add multicast single-source filter to the interface list 1918 */ 1919 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1920 struct in6_addr *psfsrc, int delta) 1921 { 1922 struct ip6_sf_list *psf, *psf_prev; 1923 1924 psf_prev = NULL; 1925 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1926 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1927 break; 1928 psf_prev = psf; 1929 } 1930 if (!psf) { 1931 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1932 if (!psf) 1933 return -ENOBUFS; 1934 1935 psf->sf_addr = *psfsrc; 1936 if (psf_prev) { 1937 psf_prev->sf_next = psf; 1938 } else 1939 pmc->mca_sources = psf; 1940 } 1941 psf->sf_count[sfmode]++; 1942 return 0; 1943 } 1944 1945 static void sf_markstate(struct ifmcaddr6 *pmc) 1946 { 1947 struct ip6_sf_list *psf; 1948 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1949 1950 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1951 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1952 psf->sf_oldin = mca_xcount == 1953 psf->sf_count[MCAST_EXCLUDE] && 1954 !psf->sf_count[MCAST_INCLUDE]; 1955 } else 1956 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1957 } 1958 1959 static int sf_setstate(struct ifmcaddr6 *pmc) 1960 { 1961 struct ip6_sf_list *psf, *dpsf; 1962 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1963 int qrv = pmc->idev->mc_qrv; 1964 int new_in, rv; 1965 1966 rv = 0; 1967 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1968 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1969 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1970 !psf->sf_count[MCAST_INCLUDE]; 1971 } else 1972 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1973 if (new_in) { 1974 if (!psf->sf_oldin) { 1975 struct ip6_sf_list *prev = NULL; 1976 1977 for (dpsf=pmc->mca_tomb; dpsf; 1978 dpsf=dpsf->sf_next) { 1979 if (ipv6_addr_equal(&dpsf->sf_addr, 1980 &psf->sf_addr)) 1981 break; 1982 prev = dpsf; 1983 } 1984 if (dpsf) { 1985 if (prev) 1986 prev->sf_next = dpsf->sf_next; 1987 else 1988 pmc->mca_tomb = dpsf->sf_next; 1989 kfree(dpsf); 1990 } 1991 psf->sf_crcount = qrv; 1992 rv++; 1993 } 1994 } else if (psf->sf_oldin) { 1995 psf->sf_crcount = 0; 1996 /* 1997 * add or update "delete" records if an active filter 1998 * is now inactive 1999 */ 2000 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2001 if (ipv6_addr_equal(&dpsf->sf_addr, 2002 &psf->sf_addr)) 2003 break; 2004 if (!dpsf) { 2005 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2006 if (!dpsf) 2007 continue; 2008 *dpsf = *psf; 2009 /* pmc->mca_lock held by callers */ 2010 dpsf->sf_next = pmc->mca_tomb; 2011 pmc->mca_tomb = dpsf; 2012 } 2013 dpsf->sf_crcount = qrv; 2014 rv++; 2015 } 2016 } 2017 return rv; 2018 } 2019 2020 /* 2021 * Add multicast source filter list to the interface list 2022 */ 2023 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2024 int sfmode, int sfcount, struct in6_addr *psfsrc, 2025 int delta) 2026 { 2027 struct ifmcaddr6 *pmc; 2028 int isexclude; 2029 int i, err; 2030 2031 if (!idev) 2032 return -ENODEV; 2033 read_lock_bh(&idev->lock); 2034 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2035 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2036 break; 2037 } 2038 if (!pmc) { 2039 /* MCA not found?? bug */ 2040 read_unlock_bh(&idev->lock); 2041 return -ESRCH; 2042 } 2043 spin_lock_bh(&pmc->mca_lock); 2044 2045 sf_markstate(pmc); 2046 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2047 if (!delta) 2048 pmc->mca_sfcount[sfmode]++; 2049 err = 0; 2050 for (i=0; i<sfcount; i++) { 2051 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2052 if (err) 2053 break; 2054 } 2055 if (err) { 2056 int j; 2057 2058 if (!delta) 2059 pmc->mca_sfcount[sfmode]--; 2060 for (j=0; j<i; j++) 2061 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2062 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2063 struct ip6_sf_list *psf; 2064 2065 /* filter mode change */ 2066 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2067 pmc->mca_sfmode = MCAST_EXCLUDE; 2068 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2069 pmc->mca_sfmode = MCAST_INCLUDE; 2070 /* else no filters; keep old mode for reports */ 2071 2072 pmc->mca_crcount = idev->mc_qrv; 2073 idev->mc_ifc_count = pmc->mca_crcount; 2074 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2075 psf->sf_crcount = 0; 2076 mld_ifc_event(idev); 2077 } else if (sf_setstate(pmc)) 2078 mld_ifc_event(idev); 2079 spin_unlock_bh(&pmc->mca_lock); 2080 read_unlock_bh(&idev->lock); 2081 return err; 2082 } 2083 2084 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2085 { 2086 struct ip6_sf_list *psf, *nextpsf; 2087 2088 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2089 nextpsf = psf->sf_next; 2090 kfree(psf); 2091 } 2092 pmc->mca_tomb = NULL; 2093 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2094 nextpsf = psf->sf_next; 2095 kfree(psf); 2096 } 2097 pmc->mca_sources = NULL; 2098 pmc->mca_sfmode = MCAST_EXCLUDE; 2099 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2100 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2101 } 2102 2103 2104 static void igmp6_join_group(struct ifmcaddr6 *ma) 2105 { 2106 unsigned long delay; 2107 2108 if (ma->mca_flags & MAF_NOREPORT) 2109 return; 2110 2111 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2112 2113 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2114 2115 spin_lock_bh(&ma->mca_lock); 2116 if (del_timer(&ma->mca_timer)) { 2117 atomic_dec(&ma->mca_refcnt); 2118 delay = ma->mca_timer.expires - jiffies; 2119 } 2120 2121 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2122 atomic_inc(&ma->mca_refcnt); 2123 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2124 spin_unlock_bh(&ma->mca_lock); 2125 } 2126 2127 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2128 struct inet6_dev *idev) 2129 { 2130 int err; 2131 2132 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2133 * so no other readers or writers of iml or its sflist 2134 */ 2135 if (!iml->sflist) { 2136 /* any-source empty exclude case */ 2137 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2138 } 2139 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2140 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2141 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2142 iml->sflist = NULL; 2143 return err; 2144 } 2145 2146 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2147 { 2148 if (MLD_V1_SEEN(ma->idev)) { 2149 if (ma->mca_flags & MAF_LAST_REPORTER) 2150 igmp6_send(&ma->mca_addr, ma->idev->dev, 2151 ICMPV6_MGM_REDUCTION); 2152 } else { 2153 mld_add_delrec(ma->idev, ma); 2154 mld_ifc_event(ma->idev); 2155 } 2156 } 2157 2158 static void mld_gq_timer_expire(unsigned long data) 2159 { 2160 struct inet6_dev *idev = (struct inet6_dev *)data; 2161 2162 idev->mc_gq_running = 0; 2163 mld_send_report(idev, NULL); 2164 __in6_dev_put(idev); 2165 } 2166 2167 static void mld_ifc_timer_expire(unsigned long data) 2168 { 2169 struct inet6_dev *idev = (struct inet6_dev *)data; 2170 2171 mld_send_cr(idev); 2172 if (idev->mc_ifc_count) { 2173 idev->mc_ifc_count--; 2174 if (idev->mc_ifc_count) 2175 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2176 } 2177 __in6_dev_put(idev); 2178 } 2179 2180 static void mld_ifc_event(struct inet6_dev *idev) 2181 { 2182 if (MLD_V1_SEEN(idev)) 2183 return; 2184 idev->mc_ifc_count = idev->mc_qrv; 2185 mld_ifc_start_timer(idev, 1); 2186 } 2187 2188 2189 static void igmp6_timer_handler(unsigned long data) 2190 { 2191 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2192 2193 if (MLD_V1_SEEN(ma->idev)) 2194 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2195 else 2196 mld_send_report(ma->idev, ma); 2197 2198 spin_lock(&ma->mca_lock); 2199 ma->mca_flags |= MAF_LAST_REPORTER; 2200 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2201 spin_unlock(&ma->mca_lock); 2202 ma_put(ma); 2203 } 2204 2205 /* Device changing type */ 2206 2207 void ipv6_mc_unmap(struct inet6_dev *idev) 2208 { 2209 struct ifmcaddr6 *i; 2210 2211 /* Install multicast list, except for all-nodes (already installed) */ 2212 2213 read_lock_bh(&idev->lock); 2214 for (i = idev->mc_list; i; i = i->next) 2215 igmp6_group_dropped(i); 2216 read_unlock_bh(&idev->lock); 2217 } 2218 2219 void ipv6_mc_remap(struct inet6_dev *idev) 2220 { 2221 ipv6_mc_up(idev); 2222 } 2223 2224 /* Device going down */ 2225 2226 void ipv6_mc_down(struct inet6_dev *idev) 2227 { 2228 struct ifmcaddr6 *i; 2229 2230 /* Withdraw multicast list */ 2231 2232 read_lock_bh(&idev->lock); 2233 idev->mc_ifc_count = 0; 2234 if (del_timer(&idev->mc_ifc_timer)) 2235 __in6_dev_put(idev); 2236 idev->mc_gq_running = 0; 2237 if (del_timer(&idev->mc_gq_timer)) 2238 __in6_dev_put(idev); 2239 2240 for (i = idev->mc_list; i; i=i->next) 2241 igmp6_group_dropped(i); 2242 read_unlock_bh(&idev->lock); 2243 2244 mld_clear_delrec(idev); 2245 } 2246 2247 2248 /* Device going up */ 2249 2250 void ipv6_mc_up(struct inet6_dev *idev) 2251 { 2252 struct ifmcaddr6 *i; 2253 2254 /* Install multicast list, except for all-nodes (already installed) */ 2255 2256 read_lock_bh(&idev->lock); 2257 for (i = idev->mc_list; i; i=i->next) 2258 igmp6_group_added(i); 2259 read_unlock_bh(&idev->lock); 2260 } 2261 2262 /* IPv6 device initialization. */ 2263 2264 void ipv6_mc_init_dev(struct inet6_dev *idev) 2265 { 2266 write_lock_bh(&idev->lock); 2267 spin_lock_init(&idev->mc_lock); 2268 idev->mc_gq_running = 0; 2269 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2270 (unsigned long)idev); 2271 idev->mc_tomb = NULL; 2272 idev->mc_ifc_count = 0; 2273 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2274 (unsigned long)idev); 2275 idev->mc_qrv = MLD_QRV_DEFAULT; 2276 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2277 idev->mc_v1_seen = 0; 2278 write_unlock_bh(&idev->lock); 2279 } 2280 2281 /* 2282 * Device is about to be destroyed: clean up. 2283 */ 2284 2285 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2286 { 2287 struct ifmcaddr6 *i; 2288 2289 /* Deactivate timers */ 2290 ipv6_mc_down(idev); 2291 2292 /* Delete all-nodes address. */ 2293 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2294 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2295 * fail. 2296 */ 2297 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2298 2299 if (idev->cnf.forwarding) 2300 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2301 2302 write_lock_bh(&idev->lock); 2303 while ((i = idev->mc_list) != NULL) { 2304 idev->mc_list = i->next; 2305 write_unlock_bh(&idev->lock); 2306 2307 igmp6_group_dropped(i); 2308 ma_put(i); 2309 2310 write_lock_bh(&idev->lock); 2311 } 2312 write_unlock_bh(&idev->lock); 2313 } 2314 2315 #ifdef CONFIG_PROC_FS 2316 struct igmp6_mc_iter_state { 2317 struct seq_net_private p; 2318 struct net_device *dev; 2319 struct inet6_dev *idev; 2320 }; 2321 2322 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2323 2324 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2325 { 2326 struct ifmcaddr6 *im = NULL; 2327 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2328 struct net *net = seq_file_net(seq); 2329 2330 state->idev = NULL; 2331 for_each_netdev_rcu(net, state->dev) { 2332 struct inet6_dev *idev; 2333 idev = __in6_dev_get(state->dev); 2334 if (!idev) 2335 continue; 2336 read_lock_bh(&idev->lock); 2337 im = idev->mc_list; 2338 if (im) { 2339 state->idev = idev; 2340 break; 2341 } 2342 read_unlock_bh(&idev->lock); 2343 } 2344 return im; 2345 } 2346 2347 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2348 { 2349 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2350 2351 im = im->next; 2352 while (!im) { 2353 if (likely(state->idev != NULL)) 2354 read_unlock_bh(&state->idev->lock); 2355 2356 state->dev = next_net_device_rcu(state->dev); 2357 if (!state->dev) { 2358 state->idev = NULL; 2359 break; 2360 } 2361 state->idev = __in6_dev_get(state->dev); 2362 if (!state->idev) 2363 continue; 2364 read_lock_bh(&state->idev->lock); 2365 im = state->idev->mc_list; 2366 } 2367 return im; 2368 } 2369 2370 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2371 { 2372 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2373 if (im) 2374 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2375 --pos; 2376 return pos ? NULL : im; 2377 } 2378 2379 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2380 __acquires(RCU) 2381 { 2382 rcu_read_lock(); 2383 return igmp6_mc_get_idx(seq, *pos); 2384 } 2385 2386 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2387 { 2388 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2389 2390 ++*pos; 2391 return im; 2392 } 2393 2394 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2395 __releases(RCU) 2396 { 2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2398 2399 if (likely(state->idev != NULL)) { 2400 read_unlock_bh(&state->idev->lock); 2401 state->idev = NULL; 2402 } 2403 state->dev = NULL; 2404 rcu_read_unlock(); 2405 } 2406 2407 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2408 { 2409 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2410 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2411 2412 seq_printf(seq, 2413 "%-4d %-15s %pi6 %5d %08X %ld\n", 2414 state->dev->ifindex, state->dev->name, 2415 &im->mca_addr, 2416 im->mca_users, im->mca_flags, 2417 (im->mca_flags&MAF_TIMER_RUNNING) ? 2418 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2419 return 0; 2420 } 2421 2422 static const struct seq_operations igmp6_mc_seq_ops = { 2423 .start = igmp6_mc_seq_start, 2424 .next = igmp6_mc_seq_next, 2425 .stop = igmp6_mc_seq_stop, 2426 .show = igmp6_mc_seq_show, 2427 }; 2428 2429 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2430 { 2431 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2432 sizeof(struct igmp6_mc_iter_state)); 2433 } 2434 2435 static const struct file_operations igmp6_mc_seq_fops = { 2436 .owner = THIS_MODULE, 2437 .open = igmp6_mc_seq_open, 2438 .read = seq_read, 2439 .llseek = seq_lseek, 2440 .release = seq_release_net, 2441 }; 2442 2443 struct igmp6_mcf_iter_state { 2444 struct seq_net_private p; 2445 struct net_device *dev; 2446 struct inet6_dev *idev; 2447 struct ifmcaddr6 *im; 2448 }; 2449 2450 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2451 2452 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2453 { 2454 struct ip6_sf_list *psf = NULL; 2455 struct ifmcaddr6 *im = NULL; 2456 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2457 struct net *net = seq_file_net(seq); 2458 2459 state->idev = NULL; 2460 state->im = NULL; 2461 for_each_netdev_rcu(net, state->dev) { 2462 struct inet6_dev *idev; 2463 idev = __in6_dev_get(state->dev); 2464 if (unlikely(idev == NULL)) 2465 continue; 2466 read_lock_bh(&idev->lock); 2467 im = idev->mc_list; 2468 if (likely(im != NULL)) { 2469 spin_lock_bh(&im->mca_lock); 2470 psf = im->mca_sources; 2471 if (likely(psf != NULL)) { 2472 state->im = im; 2473 state->idev = idev; 2474 break; 2475 } 2476 spin_unlock_bh(&im->mca_lock); 2477 } 2478 read_unlock_bh(&idev->lock); 2479 } 2480 return psf; 2481 } 2482 2483 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2484 { 2485 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2486 2487 psf = psf->sf_next; 2488 while (!psf) { 2489 spin_unlock_bh(&state->im->mca_lock); 2490 state->im = state->im->next; 2491 while (!state->im) { 2492 if (likely(state->idev != NULL)) 2493 read_unlock_bh(&state->idev->lock); 2494 2495 state->dev = next_net_device_rcu(state->dev); 2496 if (!state->dev) { 2497 state->idev = NULL; 2498 goto out; 2499 } 2500 state->idev = __in6_dev_get(state->dev); 2501 if (!state->idev) 2502 continue; 2503 read_lock_bh(&state->idev->lock); 2504 state->im = state->idev->mc_list; 2505 } 2506 if (!state->im) 2507 break; 2508 spin_lock_bh(&state->im->mca_lock); 2509 psf = state->im->mca_sources; 2510 } 2511 out: 2512 return psf; 2513 } 2514 2515 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2516 { 2517 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2518 if (psf) 2519 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2520 --pos; 2521 return pos ? NULL : psf; 2522 } 2523 2524 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2525 __acquires(RCU) 2526 { 2527 rcu_read_lock(); 2528 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2529 } 2530 2531 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2532 { 2533 struct ip6_sf_list *psf; 2534 if (v == SEQ_START_TOKEN) 2535 psf = igmp6_mcf_get_first(seq); 2536 else 2537 psf = igmp6_mcf_get_next(seq, v); 2538 ++*pos; 2539 return psf; 2540 } 2541 2542 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2543 __releases(RCU) 2544 { 2545 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2546 if (likely(state->im != NULL)) { 2547 spin_unlock_bh(&state->im->mca_lock); 2548 state->im = NULL; 2549 } 2550 if (likely(state->idev != NULL)) { 2551 read_unlock_bh(&state->idev->lock); 2552 state->idev = NULL; 2553 } 2554 state->dev = NULL; 2555 rcu_read_unlock(); 2556 } 2557 2558 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2559 { 2560 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2561 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2562 2563 if (v == SEQ_START_TOKEN) { 2564 seq_printf(seq, 2565 "%3s %6s " 2566 "%32s %32s %6s %6s\n", "Idx", 2567 "Device", "Multicast Address", 2568 "Source Address", "INC", "EXC"); 2569 } else { 2570 seq_printf(seq, 2571 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2572 state->dev->ifindex, state->dev->name, 2573 &state->im->mca_addr, 2574 &psf->sf_addr, 2575 psf->sf_count[MCAST_INCLUDE], 2576 psf->sf_count[MCAST_EXCLUDE]); 2577 } 2578 return 0; 2579 } 2580 2581 static const struct seq_operations igmp6_mcf_seq_ops = { 2582 .start = igmp6_mcf_seq_start, 2583 .next = igmp6_mcf_seq_next, 2584 .stop = igmp6_mcf_seq_stop, 2585 .show = igmp6_mcf_seq_show, 2586 }; 2587 2588 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2589 { 2590 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2591 sizeof(struct igmp6_mcf_iter_state)); 2592 } 2593 2594 static const struct file_operations igmp6_mcf_seq_fops = { 2595 .owner = THIS_MODULE, 2596 .open = igmp6_mcf_seq_open, 2597 .read = seq_read, 2598 .llseek = seq_lseek, 2599 .release = seq_release_net, 2600 }; 2601 2602 static int __net_init igmp6_proc_init(struct net *net) 2603 { 2604 int err; 2605 2606 err = -ENOMEM; 2607 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2608 goto out; 2609 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2610 &igmp6_mcf_seq_fops)) 2611 goto out_proc_net_igmp6; 2612 2613 err = 0; 2614 out: 2615 return err; 2616 2617 out_proc_net_igmp6: 2618 proc_net_remove(net, "igmp6"); 2619 goto out; 2620 } 2621 2622 static void __net_exit igmp6_proc_exit(struct net *net) 2623 { 2624 proc_net_remove(net, "mcfilter6"); 2625 proc_net_remove(net, "igmp6"); 2626 } 2627 #else 2628 static inline int igmp6_proc_init(struct net *net) 2629 { 2630 return 0; 2631 } 2632 static inline void igmp6_proc_exit(struct net *net) 2633 { 2634 } 2635 #endif 2636 2637 static int __net_init igmp6_net_init(struct net *net) 2638 { 2639 int err; 2640 2641 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2642 SOCK_RAW, IPPROTO_ICMPV6, net); 2643 if (err < 0) { 2644 printk(KERN_ERR 2645 "Failed to initialize the IGMP6 control socket (err %d).\n", 2646 err); 2647 goto out; 2648 } 2649 2650 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2651 2652 err = igmp6_proc_init(net); 2653 if (err) 2654 goto out_sock_create; 2655 out: 2656 return err; 2657 2658 out_sock_create: 2659 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2660 goto out; 2661 } 2662 2663 static void __net_exit igmp6_net_exit(struct net *net) 2664 { 2665 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2666 igmp6_proc_exit(net); 2667 } 2668 2669 static struct pernet_operations igmp6_net_ops = { 2670 .init = igmp6_net_init, 2671 .exit = igmp6_net_exit, 2672 }; 2673 2674 int __init igmp6_init(void) 2675 { 2676 return register_pernet_subsys(&igmp6_net_ops); 2677 } 2678 2679 void igmp6_cleanup(void) 2680 { 2681 unregister_pernet_subsys(&igmp6_net_ops); 2682 } 2683