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 ip6_rt_put(rt); 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 if (!ipv6_addr_is_multicast(addr)) 215 return -EINVAL; 216 217 spin_lock(&ipv6_sk_mc_lock); 218 for (lnk = &np->ipv6_mc_list; 219 (mc_lst = rcu_dereference_protected(*lnk, 220 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ; 221 lnk = &mc_lst->next) { 222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 223 ipv6_addr_equal(&mc_lst->addr, addr)) { 224 struct net_device *dev; 225 226 *lnk = mc_lst->next; 227 spin_unlock(&ipv6_sk_mc_lock); 228 229 rcu_read_lock(); 230 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 231 if (dev != NULL) { 232 struct inet6_dev *idev = __in6_dev_get(dev); 233 234 (void) ip6_mc_leave_src(sk, mc_lst, idev); 235 if (idev) 236 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 237 } else 238 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 239 rcu_read_unlock(); 240 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 241 kfree_rcu(mc_lst, rcu); 242 return 0; 243 } 244 } 245 spin_unlock(&ipv6_sk_mc_lock); 246 247 return -EADDRNOTAVAIL; 248 } 249 250 /* called with rcu_read_lock() */ 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 252 const struct in6_addr *group, 253 int ifindex) 254 { 255 struct net_device *dev = NULL; 256 struct inet6_dev *idev = NULL; 257 258 if (ifindex == 0) { 259 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); 260 261 if (rt) { 262 dev = rt->dst.dev; 263 ip6_rt_put(rt); 264 } 265 } else 266 dev = dev_get_by_index_rcu(net, ifindex); 267 268 if (!dev) 269 return NULL; 270 idev = __in6_dev_get(dev); 271 if (!idev) 272 return NULL; 273 read_lock_bh(&idev->lock); 274 if (idev->dead) { 275 read_unlock_bh(&idev->lock); 276 return NULL; 277 } 278 return idev; 279 } 280 281 void ipv6_sock_mc_close(struct sock *sk) 282 { 283 struct ipv6_pinfo *np = inet6_sk(sk); 284 struct ipv6_mc_socklist *mc_lst; 285 struct net *net = sock_net(sk); 286 287 if (!rcu_access_pointer(np->ipv6_mc_list)) 288 return; 289 290 spin_lock(&ipv6_sk_mc_lock); 291 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list, 292 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) { 293 struct net_device *dev; 294 295 np->ipv6_mc_list = mc_lst->next; 296 spin_unlock(&ipv6_sk_mc_lock); 297 298 rcu_read_lock(); 299 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 300 if (dev) { 301 struct inet6_dev *idev = __in6_dev_get(dev); 302 303 (void) ip6_mc_leave_src(sk, mc_lst, idev); 304 if (idev) 305 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 306 } else 307 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 308 rcu_read_unlock(); 309 310 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 311 kfree_rcu(mc_lst, rcu); 312 313 spin_lock(&ipv6_sk_mc_lock); 314 } 315 spin_unlock(&ipv6_sk_mc_lock); 316 } 317 318 int ip6_mc_source(int add, int omode, struct sock *sk, 319 struct group_source_req *pgsr) 320 { 321 struct in6_addr *source, *group; 322 struct ipv6_mc_socklist *pmc; 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 } 344 345 err = -EADDRNOTAVAIL; 346 347 for_each_pmc_rcu(inet6, pmc) { 348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 349 continue; 350 if (ipv6_addr_equal(&pmc->addr, group)) 351 break; 352 } 353 if (!pmc) { /* must have a prior join */ 354 err = -EINVAL; 355 goto done; 356 } 357 /* if a source filter was set, must be the same mode as before */ 358 if (pmc->sflist) { 359 if (pmc->sfmode != omode) { 360 err = -EINVAL; 361 goto done; 362 } 363 } else if (pmc->sfmode != omode) { 364 /* allow mode switches for empty-set filters */ 365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 367 pmc->sfmode = omode; 368 } 369 370 write_lock(&pmc->sflock); 371 pmclocked = 1; 372 373 psl = pmc->sflist; 374 if (!add) { 375 if (!psl) 376 goto done; /* err = -EADDRNOTAVAIL */ 377 rv = !0; 378 for (i=0; i<psl->sl_count; i++) { 379 rv = memcmp(&psl->sl_addr[i], source, 380 sizeof(struct in6_addr)); 381 if (rv == 0) 382 break; 383 } 384 if (rv) /* source not found */ 385 goto done; /* err = -EADDRNOTAVAIL */ 386 387 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 388 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 389 leavegroup = 1; 390 goto done; 391 } 392 393 /* update the interface filter */ 394 ip6_mc_del_src(idev, group, omode, 1, source, 1); 395 396 for (j=i+1; j<psl->sl_count; j++) 397 psl->sl_addr[j-1] = psl->sl_addr[j]; 398 psl->sl_count--; 399 err = 0; 400 goto done; 401 } 402 /* else, add a new source to the filter */ 403 404 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 405 err = -ENOBUFS; 406 goto done; 407 } 408 if (!psl || psl->sl_count == psl->sl_max) { 409 struct ip6_sf_socklist *newpsl; 410 int count = IP6_SFBLOCK; 411 412 if (psl) 413 count += psl->sl_max; 414 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 415 if (!newpsl) { 416 err = -ENOBUFS; 417 goto done; 418 } 419 newpsl->sl_max = count; 420 newpsl->sl_count = count - IP6_SFBLOCK; 421 if (psl) { 422 for (i=0; i<psl->sl_count; i++) 423 newpsl->sl_addr[i] = psl->sl_addr[i]; 424 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 425 } 426 pmc->sflist = psl = newpsl; 427 } 428 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 429 for (i=0; i<psl->sl_count; i++) { 430 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 431 if (rv == 0) 432 break; 433 } 434 if (rv == 0) /* address already there is an error */ 435 goto done; 436 for (j=psl->sl_count-1; j>=i; j--) 437 psl->sl_addr[j+1] = psl->sl_addr[j]; 438 psl->sl_addr[i] = *source; 439 psl->sl_count++; 440 err = 0; 441 /* update the interface list */ 442 ip6_mc_add_src(idev, group, omode, 1, source, 1); 443 done: 444 if (pmclocked) 445 write_unlock(&pmc->sflock); 446 read_unlock_bh(&idev->lock); 447 rcu_read_unlock(); 448 if (leavegroup) 449 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 450 return err; 451 } 452 453 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 454 { 455 const struct in6_addr *group; 456 struct ipv6_mc_socklist *pmc; 457 struct inet6_dev *idev; 458 struct ipv6_pinfo *inet6 = inet6_sk(sk); 459 struct ip6_sf_socklist *newpsl, *psl; 460 struct net *net = sock_net(sk); 461 int leavegroup = 0; 462 int i, err; 463 464 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 465 466 if (!ipv6_addr_is_multicast(group)) 467 return -EINVAL; 468 if (gsf->gf_fmode != MCAST_INCLUDE && 469 gsf->gf_fmode != MCAST_EXCLUDE) 470 return -EINVAL; 471 472 rcu_read_lock(); 473 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 474 475 if (!idev) { 476 rcu_read_unlock(); 477 return -ENODEV; 478 } 479 480 err = 0; 481 482 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 483 leavegroup = 1; 484 goto done; 485 } 486 487 for_each_pmc_rcu(inet6, pmc) { 488 if (pmc->ifindex != gsf->gf_interface) 489 continue; 490 if (ipv6_addr_equal(&pmc->addr, group)) 491 break; 492 } 493 if (!pmc) { /* must have a prior join */ 494 err = -EINVAL; 495 goto done; 496 } 497 if (gsf->gf_numsrc) { 498 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 499 GFP_ATOMIC); 500 if (!newpsl) { 501 err = -ENOBUFS; 502 goto done; 503 } 504 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 505 for (i=0; i<newpsl->sl_count; ++i) { 506 struct sockaddr_in6 *psin6; 507 508 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 509 newpsl->sl_addr[i] = psin6->sin6_addr; 510 } 511 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 512 newpsl->sl_count, newpsl->sl_addr, 0); 513 if (err) { 514 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 515 goto done; 516 } 517 } else { 518 newpsl = NULL; 519 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 520 } 521 522 write_lock(&pmc->sflock); 523 psl = pmc->sflist; 524 if (psl) { 525 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 526 psl->sl_count, psl->sl_addr, 0); 527 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 528 } else 529 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 530 pmc->sflist = newpsl; 531 pmc->sfmode = gsf->gf_fmode; 532 write_unlock(&pmc->sflock); 533 err = 0; 534 done: 535 read_unlock_bh(&idev->lock); 536 rcu_read_unlock(); 537 if (leavegroup) 538 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 539 return err; 540 } 541 542 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 543 struct group_filter __user *optval, int __user *optlen) 544 { 545 int err, i, count, copycount; 546 const struct in6_addr *group; 547 struct ipv6_mc_socklist *pmc; 548 struct inet6_dev *idev; 549 struct ipv6_pinfo *inet6 = inet6_sk(sk); 550 struct ip6_sf_socklist *psl; 551 struct net *net = sock_net(sk); 552 553 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 554 555 if (!ipv6_addr_is_multicast(group)) 556 return -EINVAL; 557 558 rcu_read_lock(); 559 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 560 561 if (!idev) { 562 rcu_read_unlock(); 563 return -ENODEV; 564 } 565 566 err = -EADDRNOTAVAIL; 567 /* 568 * changes to the ipv6_mc_list require the socket lock and 569 * a read lock on ip6_sk_mc_lock. We have the socket lock, 570 * so reading the list is safe. 571 */ 572 573 for_each_pmc_rcu(inet6, pmc) { 574 if (pmc->ifindex != gsf->gf_interface) 575 continue; 576 if (ipv6_addr_equal(group, &pmc->addr)) 577 break; 578 } 579 if (!pmc) /* must have a prior join */ 580 goto done; 581 gsf->gf_fmode = pmc->sfmode; 582 psl = pmc->sflist; 583 count = psl ? psl->sl_count : 0; 584 read_unlock_bh(&idev->lock); 585 rcu_read_unlock(); 586 587 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 588 gsf->gf_numsrc = count; 589 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 590 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 591 return -EFAULT; 592 } 593 /* changes to psl require the socket lock, a read lock on 594 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 595 * have the socket lock, so reading here is safe. 596 */ 597 for (i=0; i<copycount; i++) { 598 struct sockaddr_in6 *psin6; 599 struct sockaddr_storage ss; 600 601 psin6 = (struct sockaddr_in6 *)&ss; 602 memset(&ss, 0, sizeof(ss)); 603 psin6->sin6_family = AF_INET6; 604 psin6->sin6_addr = psl->sl_addr[i]; 605 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 606 return -EFAULT; 607 } 608 return 0; 609 done: 610 read_unlock_bh(&idev->lock); 611 rcu_read_unlock(); 612 return err; 613 } 614 615 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 616 const struct in6_addr *src_addr) 617 { 618 struct ipv6_pinfo *np = inet6_sk(sk); 619 struct ipv6_mc_socklist *mc; 620 struct ip6_sf_socklist *psl; 621 bool rv = true; 622 623 rcu_read_lock(); 624 for_each_pmc_rcu(np, mc) { 625 if (ipv6_addr_equal(&mc->addr, mc_addr)) 626 break; 627 } 628 if (!mc) { 629 rcu_read_unlock(); 630 return true; 631 } 632 read_lock(&mc->sflock); 633 psl = mc->sflist; 634 if (!psl) { 635 rv = mc->sfmode == MCAST_EXCLUDE; 636 } else { 637 int i; 638 639 for (i=0; i<psl->sl_count; i++) { 640 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 641 break; 642 } 643 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 644 rv = false; 645 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 646 rv = false; 647 } 648 read_unlock(&mc->sflock); 649 rcu_read_unlock(); 650 651 return rv; 652 } 653 654 static void ma_put(struct ifmcaddr6 *mc) 655 { 656 if (atomic_dec_and_test(&mc->mca_refcnt)) { 657 in6_dev_put(mc->idev); 658 kfree(mc); 659 } 660 } 661 662 static void igmp6_group_added(struct ifmcaddr6 *mc) 663 { 664 struct net_device *dev = mc->idev->dev; 665 char buf[MAX_ADDR_LEN]; 666 667 spin_lock_bh(&mc->mca_lock); 668 if (!(mc->mca_flags&MAF_LOADED)) { 669 mc->mca_flags |= MAF_LOADED; 670 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 671 dev_mc_add(dev, buf); 672 } 673 spin_unlock_bh(&mc->mca_lock); 674 675 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 676 return; 677 678 if (MLD_V1_SEEN(mc->idev)) { 679 igmp6_join_group(mc); 680 return; 681 } 682 /* else v2 */ 683 684 mc->mca_crcount = mc->idev->mc_qrv; 685 mld_ifc_event(mc->idev); 686 } 687 688 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 689 { 690 struct net_device *dev = mc->idev->dev; 691 char buf[MAX_ADDR_LEN]; 692 693 spin_lock_bh(&mc->mca_lock); 694 if (mc->mca_flags&MAF_LOADED) { 695 mc->mca_flags &= ~MAF_LOADED; 696 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 697 dev_mc_del(dev, buf); 698 } 699 700 if (mc->mca_flags & MAF_NOREPORT) 701 goto done; 702 spin_unlock_bh(&mc->mca_lock); 703 704 if (!mc->idev->dead) 705 igmp6_leave_group(mc); 706 707 spin_lock_bh(&mc->mca_lock); 708 if (del_timer(&mc->mca_timer)) 709 atomic_dec(&mc->mca_refcnt); 710 done: 711 ip6_mc_clear_src(mc); 712 spin_unlock_bh(&mc->mca_lock); 713 } 714 715 /* 716 * deleted ifmcaddr6 manipulation 717 */ 718 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 719 { 720 struct ifmcaddr6 *pmc; 721 722 /* this is an "ifmcaddr6" for convenience; only the fields below 723 * are actually used. In particular, the refcnt and users are not 724 * used for management of the delete list. Using the same structure 725 * for deleted items allows change reports to use common code with 726 * non-deleted or query-response MCA's. 727 */ 728 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 729 if (!pmc) 730 return; 731 732 spin_lock_bh(&im->mca_lock); 733 spin_lock_init(&pmc->mca_lock); 734 pmc->idev = im->idev; 735 in6_dev_hold(idev); 736 pmc->mca_addr = im->mca_addr; 737 pmc->mca_crcount = idev->mc_qrv; 738 pmc->mca_sfmode = im->mca_sfmode; 739 if (pmc->mca_sfmode == MCAST_INCLUDE) { 740 struct ip6_sf_list *psf; 741 742 pmc->mca_tomb = im->mca_tomb; 743 pmc->mca_sources = im->mca_sources; 744 im->mca_tomb = im->mca_sources = NULL; 745 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 746 psf->sf_crcount = pmc->mca_crcount; 747 } 748 spin_unlock_bh(&im->mca_lock); 749 750 spin_lock_bh(&idev->mc_lock); 751 pmc->next = idev->mc_tomb; 752 idev->mc_tomb = pmc; 753 spin_unlock_bh(&idev->mc_lock); 754 } 755 756 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca) 757 { 758 struct ifmcaddr6 *pmc, *pmc_prev; 759 struct ip6_sf_list *psf, *psf_next; 760 761 spin_lock_bh(&idev->mc_lock); 762 pmc_prev = NULL; 763 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 764 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 765 break; 766 pmc_prev = pmc; 767 } 768 if (pmc) { 769 if (pmc_prev) 770 pmc_prev->next = pmc->next; 771 else 772 idev->mc_tomb = pmc->next; 773 } 774 spin_unlock_bh(&idev->mc_lock); 775 776 if (pmc) { 777 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 778 psf_next = psf->sf_next; 779 kfree(psf); 780 } 781 in6_dev_put(pmc->idev); 782 kfree(pmc); 783 } 784 } 785 786 static void mld_clear_delrec(struct inet6_dev *idev) 787 { 788 struct ifmcaddr6 *pmc, *nextpmc; 789 790 spin_lock_bh(&idev->mc_lock); 791 pmc = idev->mc_tomb; 792 idev->mc_tomb = NULL; 793 spin_unlock_bh(&idev->mc_lock); 794 795 for (; pmc; pmc = nextpmc) { 796 nextpmc = pmc->next; 797 ip6_mc_clear_src(pmc); 798 in6_dev_put(pmc->idev); 799 kfree(pmc); 800 } 801 802 /* clear dead sources, too */ 803 read_lock_bh(&idev->lock); 804 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 805 struct ip6_sf_list *psf, *psf_next; 806 807 spin_lock_bh(&pmc->mca_lock); 808 psf = pmc->mca_tomb; 809 pmc->mca_tomb = NULL; 810 spin_unlock_bh(&pmc->mca_lock); 811 for (; psf; psf=psf_next) { 812 psf_next = psf->sf_next; 813 kfree(psf); 814 } 815 } 816 read_unlock_bh(&idev->lock); 817 } 818 819 820 /* 821 * device multicast group inc (add if not found) 822 */ 823 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 824 { 825 struct ifmcaddr6 *mc; 826 struct inet6_dev *idev; 827 828 /* we need to take a reference on idev */ 829 idev = in6_dev_get(dev); 830 831 if (idev == NULL) 832 return -EINVAL; 833 834 write_lock_bh(&idev->lock); 835 if (idev->dead) { 836 write_unlock_bh(&idev->lock); 837 in6_dev_put(idev); 838 return -ENODEV; 839 } 840 841 for (mc = idev->mc_list; mc; mc = mc->next) { 842 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 843 mc->mca_users++; 844 write_unlock_bh(&idev->lock); 845 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 846 NULL, 0); 847 in6_dev_put(idev); 848 return 0; 849 } 850 } 851 852 /* 853 * not found: create a new one. 854 */ 855 856 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 857 858 if (mc == NULL) { 859 write_unlock_bh(&idev->lock); 860 in6_dev_put(idev); 861 return -ENOMEM; 862 } 863 864 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 865 866 mc->mca_addr = *addr; 867 mc->idev = idev; /* (reference taken) */ 868 mc->mca_users = 1; 869 /* mca_stamp should be updated upon changes */ 870 mc->mca_cstamp = mc->mca_tstamp = jiffies; 871 atomic_set(&mc->mca_refcnt, 2); 872 spin_lock_init(&mc->mca_lock); 873 874 /* initial mode is (EX, empty) */ 875 mc->mca_sfmode = MCAST_EXCLUDE; 876 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 877 878 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 879 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 880 mc->mca_flags |= MAF_NOREPORT; 881 882 mc->next = idev->mc_list; 883 idev->mc_list = mc; 884 write_unlock_bh(&idev->lock); 885 886 mld_del_delrec(idev, &mc->mca_addr); 887 igmp6_group_added(mc); 888 ma_put(mc); 889 return 0; 890 } 891 892 /* 893 * device multicast group del 894 */ 895 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 896 { 897 struct ifmcaddr6 *ma, **map; 898 899 write_lock_bh(&idev->lock); 900 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 901 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 902 if (--ma->mca_users == 0) { 903 *map = ma->next; 904 write_unlock_bh(&idev->lock); 905 906 igmp6_group_dropped(ma); 907 908 ma_put(ma); 909 return 0; 910 } 911 write_unlock_bh(&idev->lock); 912 return 0; 913 } 914 } 915 write_unlock_bh(&idev->lock); 916 917 return -ENOENT; 918 } 919 920 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 921 { 922 struct inet6_dev *idev; 923 int err; 924 925 rcu_read_lock(); 926 927 idev = __in6_dev_get(dev); 928 if (!idev) 929 err = -ENODEV; 930 else 931 err = __ipv6_dev_mc_dec(idev, addr); 932 933 rcu_read_unlock(); 934 return err; 935 } 936 937 /* 938 * identify MLD packets for MLD filter exceptions 939 */ 940 bool ipv6_is_mld(struct sk_buff *skb, int nexthdr) 941 { 942 struct icmp6hdr *pic; 943 944 if (nexthdr != IPPROTO_ICMPV6) 945 return false; 946 947 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 948 return false; 949 950 pic = icmp6_hdr(skb); 951 952 switch (pic->icmp6_type) { 953 case ICMPV6_MGM_QUERY: 954 case ICMPV6_MGM_REPORT: 955 case ICMPV6_MGM_REDUCTION: 956 case ICMPV6_MLD2_REPORT: 957 return true; 958 default: 959 break; 960 } 961 return false; 962 } 963 964 /* 965 * check if the interface/address pair is valid 966 */ 967 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 968 const struct in6_addr *src_addr) 969 { 970 struct inet6_dev *idev; 971 struct ifmcaddr6 *mc; 972 bool rv = false; 973 974 rcu_read_lock(); 975 idev = __in6_dev_get(dev); 976 if (idev) { 977 read_lock_bh(&idev->lock); 978 for (mc = idev->mc_list; mc; mc=mc->next) { 979 if (ipv6_addr_equal(&mc->mca_addr, group)) 980 break; 981 } 982 if (mc) { 983 if (src_addr && !ipv6_addr_any(src_addr)) { 984 struct ip6_sf_list *psf; 985 986 spin_lock_bh(&mc->mca_lock); 987 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 988 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 989 break; 990 } 991 if (psf) 992 rv = psf->sf_count[MCAST_INCLUDE] || 993 psf->sf_count[MCAST_EXCLUDE] != 994 mc->mca_sfcount[MCAST_EXCLUDE]; 995 else 996 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 997 spin_unlock_bh(&mc->mca_lock); 998 } else 999 rv = true; /* don't filter unspecified source */ 1000 } 1001 read_unlock_bh(&idev->lock); 1002 } 1003 rcu_read_unlock(); 1004 return rv; 1005 } 1006 1007 static void mld_gq_start_timer(struct inet6_dev *idev) 1008 { 1009 int tv = net_random() % idev->mc_maxdelay; 1010 1011 idev->mc_gq_running = 1; 1012 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1013 in6_dev_hold(idev); 1014 } 1015 1016 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1017 { 1018 int tv = net_random() % delay; 1019 1020 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1021 in6_dev_hold(idev); 1022 } 1023 1024 /* 1025 * IGMP handling (alias multicast ICMPv6 messages) 1026 */ 1027 1028 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1029 { 1030 unsigned long delay = resptime; 1031 1032 /* Do not start timer for these addresses */ 1033 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1034 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1035 return; 1036 1037 if (del_timer(&ma->mca_timer)) { 1038 atomic_dec(&ma->mca_refcnt); 1039 delay = ma->mca_timer.expires - jiffies; 1040 } 1041 1042 if (delay >= resptime) { 1043 if (resptime) 1044 delay = net_random() % resptime; 1045 else 1046 delay = 1; 1047 } 1048 ma->mca_timer.expires = jiffies + delay; 1049 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1050 atomic_inc(&ma->mca_refcnt); 1051 ma->mca_flags |= MAF_TIMER_RUNNING; 1052 } 1053 1054 /* mark EXCLUDE-mode sources */ 1055 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1056 const struct in6_addr *srcs) 1057 { 1058 struct ip6_sf_list *psf; 1059 int i, scount; 1060 1061 scount = 0; 1062 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1063 if (scount == nsrcs) 1064 break; 1065 for (i=0; i<nsrcs; i++) { 1066 /* skip inactive filters */ 1067 if (psf->sf_count[MCAST_INCLUDE] || 1068 pmc->mca_sfcount[MCAST_EXCLUDE] != 1069 psf->sf_count[MCAST_EXCLUDE]) 1070 break; 1071 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1072 scount++; 1073 break; 1074 } 1075 } 1076 } 1077 pmc->mca_flags &= ~MAF_GSQUERY; 1078 if (scount == nsrcs) /* all sources excluded */ 1079 return false; 1080 return true; 1081 } 1082 1083 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1084 const struct in6_addr *srcs) 1085 { 1086 struct ip6_sf_list *psf; 1087 int i, scount; 1088 1089 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1090 return mld_xmarksources(pmc, nsrcs, srcs); 1091 1092 /* mark INCLUDE-mode sources */ 1093 1094 scount = 0; 1095 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1096 if (scount == nsrcs) 1097 break; 1098 for (i=0; i<nsrcs; i++) { 1099 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1100 psf->sf_gsresp = 1; 1101 scount++; 1102 break; 1103 } 1104 } 1105 } 1106 if (!scount) { 1107 pmc->mca_flags &= ~MAF_GSQUERY; 1108 return false; 1109 } 1110 pmc->mca_flags |= MAF_GSQUERY; 1111 return true; 1112 } 1113 1114 /* called with rcu_read_lock() */ 1115 int igmp6_event_query(struct sk_buff *skb) 1116 { 1117 struct mld2_query *mlh2 = NULL; 1118 struct ifmcaddr6 *ma; 1119 const struct in6_addr *group; 1120 unsigned long max_delay; 1121 struct inet6_dev *idev; 1122 struct mld_msg *mld; 1123 int group_type; 1124 int mark = 0; 1125 int len; 1126 1127 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1128 return -EINVAL; 1129 1130 /* compute payload length excluding extension headers */ 1131 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1132 len -= skb_network_header_len(skb); 1133 1134 /* Drop queries with not link local source */ 1135 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1136 return -EINVAL; 1137 1138 idev = __in6_dev_get(skb->dev); 1139 1140 if (idev == NULL) 1141 return 0; 1142 1143 mld = (struct mld_msg *)icmp6_hdr(skb); 1144 group = &mld->mld_mca; 1145 group_type = ipv6_addr_type(group); 1146 1147 if (group_type != IPV6_ADDR_ANY && 1148 !(group_type&IPV6_ADDR_MULTICAST)) 1149 return -EINVAL; 1150 1151 if (len == 24) { 1152 int switchback; 1153 /* MLDv1 router present */ 1154 1155 /* Translate milliseconds to jiffies */ 1156 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000; 1157 1158 switchback = (idev->mc_qrv + 1) * max_delay; 1159 idev->mc_v1_seen = jiffies + switchback; 1160 1161 /* cancel the interface change timer */ 1162 idev->mc_ifc_count = 0; 1163 if (del_timer(&idev->mc_ifc_timer)) 1164 __in6_dev_put(idev); 1165 /* clear deleted report items */ 1166 mld_clear_delrec(idev); 1167 } else if (len >= 28) { 1168 int srcs_offset = sizeof(struct mld2_query) - 1169 sizeof(struct icmp6hdr); 1170 if (!pskb_may_pull(skb, srcs_offset)) 1171 return -EINVAL; 1172 1173 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1174 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000; 1175 if (!max_delay) 1176 max_delay = 1; 1177 idev->mc_maxdelay = max_delay; 1178 if (mlh2->mld2q_qrv) 1179 idev->mc_qrv = mlh2->mld2q_qrv; 1180 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1181 if (mlh2->mld2q_nsrcs) 1182 return -EINVAL; /* no sources allowed */ 1183 1184 mld_gq_start_timer(idev); 1185 return 0; 1186 } 1187 /* mark sources to include, if group & source-specific */ 1188 if (mlh2->mld2q_nsrcs != 0) { 1189 if (!pskb_may_pull(skb, srcs_offset + 1190 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1191 return -EINVAL; 1192 1193 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1194 mark = 1; 1195 } 1196 } else 1197 return -EINVAL; 1198 1199 read_lock_bh(&idev->lock); 1200 if (group_type == IPV6_ADDR_ANY) { 1201 for (ma = idev->mc_list; ma; ma=ma->next) { 1202 spin_lock_bh(&ma->mca_lock); 1203 igmp6_group_queried(ma, max_delay); 1204 spin_unlock_bh(&ma->mca_lock); 1205 } 1206 } else { 1207 for (ma = idev->mc_list; ma; ma=ma->next) { 1208 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1209 continue; 1210 spin_lock_bh(&ma->mca_lock); 1211 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1212 /* gsquery <- gsquery && mark */ 1213 if (!mark) 1214 ma->mca_flags &= ~MAF_GSQUERY; 1215 } else { 1216 /* gsquery <- mark */ 1217 if (mark) 1218 ma->mca_flags |= MAF_GSQUERY; 1219 else 1220 ma->mca_flags &= ~MAF_GSQUERY; 1221 } 1222 if (!(ma->mca_flags & MAF_GSQUERY) || 1223 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1224 igmp6_group_queried(ma, max_delay); 1225 spin_unlock_bh(&ma->mca_lock); 1226 break; 1227 } 1228 } 1229 read_unlock_bh(&idev->lock); 1230 1231 return 0; 1232 } 1233 1234 /* called with rcu_read_lock() */ 1235 int igmp6_event_report(struct sk_buff *skb) 1236 { 1237 struct ifmcaddr6 *ma; 1238 struct inet6_dev *idev; 1239 struct mld_msg *mld; 1240 int addr_type; 1241 1242 /* Our own report looped back. Ignore it. */ 1243 if (skb->pkt_type == PACKET_LOOPBACK) 1244 return 0; 1245 1246 /* send our report if the MC router may not have heard this report */ 1247 if (skb->pkt_type != PACKET_MULTICAST && 1248 skb->pkt_type != PACKET_BROADCAST) 1249 return 0; 1250 1251 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1252 return -EINVAL; 1253 1254 mld = (struct mld_msg *)icmp6_hdr(skb); 1255 1256 /* Drop reports with not link local source */ 1257 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1258 if (addr_type != IPV6_ADDR_ANY && 1259 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1260 return -EINVAL; 1261 1262 idev = __in6_dev_get(skb->dev); 1263 if (idev == NULL) 1264 return -ENODEV; 1265 1266 /* 1267 * Cancel the timer for this group 1268 */ 1269 1270 read_lock_bh(&idev->lock); 1271 for (ma = idev->mc_list; ma; ma=ma->next) { 1272 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1273 spin_lock(&ma->mca_lock); 1274 if (del_timer(&ma->mca_timer)) 1275 atomic_dec(&ma->mca_refcnt); 1276 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1277 spin_unlock(&ma->mca_lock); 1278 break; 1279 } 1280 } 1281 read_unlock_bh(&idev->lock); 1282 return 0; 1283 } 1284 1285 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1286 int gdeleted, int sdeleted) 1287 { 1288 switch (type) { 1289 case MLD2_MODE_IS_INCLUDE: 1290 case MLD2_MODE_IS_EXCLUDE: 1291 if (gdeleted || sdeleted) 1292 return false; 1293 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1294 if (pmc->mca_sfmode == MCAST_INCLUDE) 1295 return true; 1296 /* don't include if this source is excluded 1297 * in all filters 1298 */ 1299 if (psf->sf_count[MCAST_INCLUDE]) 1300 return type == MLD2_MODE_IS_INCLUDE; 1301 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1302 psf->sf_count[MCAST_EXCLUDE]; 1303 } 1304 return false; 1305 case MLD2_CHANGE_TO_INCLUDE: 1306 if (gdeleted || sdeleted) 1307 return false; 1308 return psf->sf_count[MCAST_INCLUDE] != 0; 1309 case MLD2_CHANGE_TO_EXCLUDE: 1310 if (gdeleted || sdeleted) 1311 return false; 1312 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1313 psf->sf_count[MCAST_INCLUDE]) 1314 return false; 1315 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1316 psf->sf_count[MCAST_EXCLUDE]; 1317 case MLD2_ALLOW_NEW_SOURCES: 1318 if (gdeleted || !psf->sf_crcount) 1319 return false; 1320 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1321 case MLD2_BLOCK_OLD_SOURCES: 1322 if (pmc->mca_sfmode == MCAST_INCLUDE) 1323 return gdeleted || (psf->sf_crcount && sdeleted); 1324 return psf->sf_crcount && !gdeleted && !sdeleted; 1325 } 1326 return false; 1327 } 1328 1329 static int 1330 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1331 { 1332 struct ip6_sf_list *psf; 1333 int scount = 0; 1334 1335 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1336 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1337 continue; 1338 scount++; 1339 } 1340 return scount; 1341 } 1342 1343 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1344 { 1345 struct net *net = dev_net(dev); 1346 struct sock *sk = net->ipv6.igmp_sk; 1347 struct sk_buff *skb; 1348 struct mld2_report *pmr; 1349 struct in6_addr addr_buf; 1350 const struct in6_addr *saddr; 1351 int hlen = LL_RESERVED_SPACE(dev); 1352 int tlen = dev->needed_tailroom; 1353 int err; 1354 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1355 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1356 IPV6_TLV_PADN, 0 }; 1357 1358 /* we assume size > sizeof(ra) here */ 1359 size += hlen + tlen; 1360 /* limit our allocations to order-0 page */ 1361 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1362 skb = sock_alloc_send_skb(sk, size, 1, &err); 1363 1364 if (!skb) 1365 return NULL; 1366 1367 skb_reserve(skb, hlen); 1368 1369 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1370 /* <draft-ietf-magma-mld-source-05.txt>: 1371 * use unspecified address as the source address 1372 * when a valid link-local address is not available. 1373 */ 1374 saddr = &in6addr_any; 1375 } else 1376 saddr = &addr_buf; 1377 1378 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1379 1380 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1381 1382 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1383 skb_put(skb, sizeof(*pmr)); 1384 pmr = (struct mld2_report *)skb_transport_header(skb); 1385 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1386 pmr->mld2r_resv1 = 0; 1387 pmr->mld2r_cksum = 0; 1388 pmr->mld2r_resv2 = 0; 1389 pmr->mld2r_ngrec = 0; 1390 return skb; 1391 } 1392 1393 static void mld_sendpack(struct sk_buff *skb) 1394 { 1395 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1396 struct mld2_report *pmr = 1397 (struct mld2_report *)skb_transport_header(skb); 1398 int payload_len, mldlen; 1399 struct inet6_dev *idev; 1400 struct net *net = dev_net(skb->dev); 1401 int err; 1402 struct flowi6 fl6; 1403 struct dst_entry *dst; 1404 1405 rcu_read_lock(); 1406 idev = __in6_dev_get(skb->dev); 1407 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1408 1409 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1410 mldlen = skb->tail - skb->transport_header; 1411 pip6->payload_len = htons(payload_len); 1412 1413 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1414 IPPROTO_ICMPV6, 1415 csum_partial(skb_transport_header(skb), 1416 mldlen, 0)); 1417 1418 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1419 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1420 skb->dev->ifindex); 1421 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6); 1422 1423 err = 0; 1424 if (IS_ERR(dst)) { 1425 err = PTR_ERR(dst); 1426 dst = NULL; 1427 } 1428 skb_dst_set(skb, dst); 1429 if (err) 1430 goto err_out; 1431 1432 payload_len = skb->len; 1433 1434 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1435 dst_output); 1436 out: 1437 if (!err) { 1438 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1439 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1440 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1441 } else 1442 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1443 1444 rcu_read_unlock(); 1445 return; 1446 1447 err_out: 1448 kfree_skb(skb); 1449 goto out; 1450 } 1451 1452 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1453 { 1454 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1455 } 1456 1457 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1458 int type, struct mld2_grec **ppgr) 1459 { 1460 struct net_device *dev = pmc->idev->dev; 1461 struct mld2_report *pmr; 1462 struct mld2_grec *pgr; 1463 1464 if (!skb) 1465 skb = mld_newpack(dev, dev->mtu); 1466 if (!skb) 1467 return NULL; 1468 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1469 pgr->grec_type = type; 1470 pgr->grec_auxwords = 0; 1471 pgr->grec_nsrcs = 0; 1472 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1473 pmr = (struct mld2_report *)skb_transport_header(skb); 1474 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1475 *ppgr = pgr; 1476 return skb; 1477 } 1478 1479 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1480 skb_tailroom(skb)) : 0) 1481 1482 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1483 int type, int gdeleted, int sdeleted) 1484 { 1485 struct net_device *dev = pmc->idev->dev; 1486 struct mld2_report *pmr; 1487 struct mld2_grec *pgr = NULL; 1488 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1489 int scount, stotal, first, isquery, truncate; 1490 1491 if (pmc->mca_flags & MAF_NOREPORT) 1492 return skb; 1493 1494 isquery = type == MLD2_MODE_IS_INCLUDE || 1495 type == MLD2_MODE_IS_EXCLUDE; 1496 truncate = type == MLD2_MODE_IS_EXCLUDE || 1497 type == MLD2_CHANGE_TO_EXCLUDE; 1498 1499 stotal = scount = 0; 1500 1501 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1502 1503 if (!*psf_list) 1504 goto empty_source; 1505 1506 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1507 1508 /* EX and TO_EX get a fresh packet, if needed */ 1509 if (truncate) { 1510 if (pmr && pmr->mld2r_ngrec && 1511 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1512 if (skb) 1513 mld_sendpack(skb); 1514 skb = mld_newpack(dev, dev->mtu); 1515 } 1516 } 1517 first = 1; 1518 psf_prev = NULL; 1519 for (psf=*psf_list; psf; psf=psf_next) { 1520 struct in6_addr *psrc; 1521 1522 psf_next = psf->sf_next; 1523 1524 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1525 psf_prev = psf; 1526 continue; 1527 } 1528 1529 /* clear marks on query responses */ 1530 if (isquery) 1531 psf->sf_gsresp = 0; 1532 1533 if (AVAILABLE(skb) < sizeof(*psrc) + 1534 first*sizeof(struct mld2_grec)) { 1535 if (truncate && !first) 1536 break; /* truncate these */ 1537 if (pgr) 1538 pgr->grec_nsrcs = htons(scount); 1539 if (skb) 1540 mld_sendpack(skb); 1541 skb = mld_newpack(dev, dev->mtu); 1542 first = 1; 1543 scount = 0; 1544 } 1545 if (first) { 1546 skb = add_grhead(skb, pmc, type, &pgr); 1547 first = 0; 1548 } 1549 if (!skb) 1550 return NULL; 1551 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1552 *psrc = psf->sf_addr; 1553 scount++; stotal++; 1554 if ((type == MLD2_ALLOW_NEW_SOURCES || 1555 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1556 psf->sf_crcount--; 1557 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1558 if (psf_prev) 1559 psf_prev->sf_next = psf->sf_next; 1560 else 1561 *psf_list = psf->sf_next; 1562 kfree(psf); 1563 continue; 1564 } 1565 } 1566 psf_prev = psf; 1567 } 1568 1569 empty_source: 1570 if (!stotal) { 1571 if (type == MLD2_ALLOW_NEW_SOURCES || 1572 type == MLD2_BLOCK_OLD_SOURCES) 1573 return skb; 1574 if (pmc->mca_crcount || isquery) { 1575 /* make sure we have room for group header */ 1576 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1577 mld_sendpack(skb); 1578 skb = NULL; /* add_grhead will get a new one */ 1579 } 1580 skb = add_grhead(skb, pmc, type, &pgr); 1581 } 1582 } 1583 if (pgr) 1584 pgr->grec_nsrcs = htons(scount); 1585 1586 if (isquery) 1587 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1588 return skb; 1589 } 1590 1591 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1592 { 1593 struct sk_buff *skb = NULL; 1594 int type; 1595 1596 if (!pmc) { 1597 read_lock_bh(&idev->lock); 1598 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1599 if (pmc->mca_flags & MAF_NOREPORT) 1600 continue; 1601 spin_lock_bh(&pmc->mca_lock); 1602 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1603 type = MLD2_MODE_IS_EXCLUDE; 1604 else 1605 type = MLD2_MODE_IS_INCLUDE; 1606 skb = add_grec(skb, pmc, type, 0, 0); 1607 spin_unlock_bh(&pmc->mca_lock); 1608 } 1609 read_unlock_bh(&idev->lock); 1610 } else { 1611 spin_lock_bh(&pmc->mca_lock); 1612 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1613 type = MLD2_MODE_IS_EXCLUDE; 1614 else 1615 type = MLD2_MODE_IS_INCLUDE; 1616 skb = add_grec(skb, pmc, type, 0, 0); 1617 spin_unlock_bh(&pmc->mca_lock); 1618 } 1619 if (skb) 1620 mld_sendpack(skb); 1621 } 1622 1623 /* 1624 * remove zero-count source records from a source filter list 1625 */ 1626 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1627 { 1628 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1629 1630 psf_prev = NULL; 1631 for (psf=*ppsf; psf; psf = psf_next) { 1632 psf_next = psf->sf_next; 1633 if (psf->sf_crcount == 0) { 1634 if (psf_prev) 1635 psf_prev->sf_next = psf->sf_next; 1636 else 1637 *ppsf = psf->sf_next; 1638 kfree(psf); 1639 } else 1640 psf_prev = psf; 1641 } 1642 } 1643 1644 static void mld_send_cr(struct inet6_dev *idev) 1645 { 1646 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1647 struct sk_buff *skb = NULL; 1648 int type, dtype; 1649 1650 read_lock_bh(&idev->lock); 1651 spin_lock(&idev->mc_lock); 1652 1653 /* deleted MCA's */ 1654 pmc_prev = NULL; 1655 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1656 pmc_next = pmc->next; 1657 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1658 type = MLD2_BLOCK_OLD_SOURCES; 1659 dtype = MLD2_BLOCK_OLD_SOURCES; 1660 skb = add_grec(skb, pmc, type, 1, 0); 1661 skb = add_grec(skb, pmc, dtype, 1, 1); 1662 } 1663 if (pmc->mca_crcount) { 1664 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1665 type = MLD2_CHANGE_TO_INCLUDE; 1666 skb = add_grec(skb, pmc, type, 1, 0); 1667 } 1668 pmc->mca_crcount--; 1669 if (pmc->mca_crcount == 0) { 1670 mld_clear_zeros(&pmc->mca_tomb); 1671 mld_clear_zeros(&pmc->mca_sources); 1672 } 1673 } 1674 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1675 !pmc->mca_sources) { 1676 if (pmc_prev) 1677 pmc_prev->next = pmc_next; 1678 else 1679 idev->mc_tomb = pmc_next; 1680 in6_dev_put(pmc->idev); 1681 kfree(pmc); 1682 } else 1683 pmc_prev = pmc; 1684 } 1685 spin_unlock(&idev->mc_lock); 1686 1687 /* change recs */ 1688 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1689 spin_lock_bh(&pmc->mca_lock); 1690 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1691 type = MLD2_BLOCK_OLD_SOURCES; 1692 dtype = MLD2_ALLOW_NEW_SOURCES; 1693 } else { 1694 type = MLD2_ALLOW_NEW_SOURCES; 1695 dtype = MLD2_BLOCK_OLD_SOURCES; 1696 } 1697 skb = add_grec(skb, pmc, type, 0, 0); 1698 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1699 1700 /* filter mode changes */ 1701 if (pmc->mca_crcount) { 1702 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1703 type = MLD2_CHANGE_TO_EXCLUDE; 1704 else 1705 type = MLD2_CHANGE_TO_INCLUDE; 1706 skb = add_grec(skb, pmc, type, 0, 0); 1707 pmc->mca_crcount--; 1708 } 1709 spin_unlock_bh(&pmc->mca_lock); 1710 } 1711 read_unlock_bh(&idev->lock); 1712 if (!skb) 1713 return; 1714 (void) mld_sendpack(skb); 1715 } 1716 1717 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1718 { 1719 struct net *net = dev_net(dev); 1720 struct sock *sk = net->ipv6.igmp_sk; 1721 struct inet6_dev *idev; 1722 struct sk_buff *skb; 1723 struct mld_msg *hdr; 1724 const struct in6_addr *snd_addr, *saddr; 1725 struct in6_addr addr_buf; 1726 int hlen = LL_RESERVED_SPACE(dev); 1727 int tlen = dev->needed_tailroom; 1728 int err, len, payload_len, full_len; 1729 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1730 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1731 IPV6_TLV_PADN, 0 }; 1732 struct flowi6 fl6; 1733 struct dst_entry *dst; 1734 1735 if (type == ICMPV6_MGM_REDUCTION) 1736 snd_addr = &in6addr_linklocal_allrouters; 1737 else 1738 snd_addr = addr; 1739 1740 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1741 payload_len = len + sizeof(ra); 1742 full_len = sizeof(struct ipv6hdr) + payload_len; 1743 1744 rcu_read_lock(); 1745 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1746 IPSTATS_MIB_OUT, full_len); 1747 rcu_read_unlock(); 1748 1749 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1750 1751 if (skb == NULL) { 1752 rcu_read_lock(); 1753 IP6_INC_STATS(net, __in6_dev_get(dev), 1754 IPSTATS_MIB_OUTDISCARDS); 1755 rcu_read_unlock(); 1756 return; 1757 } 1758 1759 skb_reserve(skb, hlen); 1760 1761 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1762 /* <draft-ietf-magma-mld-source-05.txt>: 1763 * use unspecified address as the source address 1764 * when a valid link-local address is not available. 1765 */ 1766 saddr = &in6addr_any; 1767 } else 1768 saddr = &addr_buf; 1769 1770 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1771 1772 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1773 1774 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1775 memset(hdr, 0, sizeof(struct mld_msg)); 1776 hdr->mld_type = type; 1777 hdr->mld_mca = *addr; 1778 1779 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1780 IPPROTO_ICMPV6, 1781 csum_partial(hdr, len, 0)); 1782 1783 rcu_read_lock(); 1784 idev = __in6_dev_get(skb->dev); 1785 1786 icmpv6_flow_init(sk, &fl6, type, 1787 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1788 skb->dev->ifindex); 1789 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6); 1790 if (IS_ERR(dst)) { 1791 err = PTR_ERR(dst); 1792 goto err_out; 1793 } 1794 1795 skb_dst_set(skb, dst); 1796 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1797 dst_output); 1798 out: 1799 if (!err) { 1800 ICMP6MSGOUT_INC_STATS(net, idev, type); 1801 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1802 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1803 } else 1804 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1805 1806 rcu_read_unlock(); 1807 return; 1808 1809 err_out: 1810 kfree_skb(skb); 1811 goto out; 1812 } 1813 1814 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1815 const struct in6_addr *psfsrc) 1816 { 1817 struct ip6_sf_list *psf, *psf_prev; 1818 int rv = 0; 1819 1820 psf_prev = NULL; 1821 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1822 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1823 break; 1824 psf_prev = psf; 1825 } 1826 if (!psf || psf->sf_count[sfmode] == 0) { 1827 /* source filter not found, or count wrong => bug */ 1828 return -ESRCH; 1829 } 1830 psf->sf_count[sfmode]--; 1831 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1832 struct inet6_dev *idev = pmc->idev; 1833 1834 /* no more filters for this source */ 1835 if (psf_prev) 1836 psf_prev->sf_next = psf->sf_next; 1837 else 1838 pmc->mca_sources = psf->sf_next; 1839 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1840 !MLD_V1_SEEN(idev)) { 1841 psf->sf_crcount = idev->mc_qrv; 1842 psf->sf_next = pmc->mca_tomb; 1843 pmc->mca_tomb = psf; 1844 rv = 1; 1845 } else 1846 kfree(psf); 1847 } 1848 return rv; 1849 } 1850 1851 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 1852 int sfmode, int sfcount, const struct in6_addr *psfsrc, 1853 int delta) 1854 { 1855 struct ifmcaddr6 *pmc; 1856 int changerec = 0; 1857 int i, err; 1858 1859 if (!idev) 1860 return -ENODEV; 1861 read_lock_bh(&idev->lock); 1862 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1863 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1864 break; 1865 } 1866 if (!pmc) { 1867 /* MCA not found?? bug */ 1868 read_unlock_bh(&idev->lock); 1869 return -ESRCH; 1870 } 1871 spin_lock_bh(&pmc->mca_lock); 1872 sf_markstate(pmc); 1873 if (!delta) { 1874 if (!pmc->mca_sfcount[sfmode]) { 1875 spin_unlock_bh(&pmc->mca_lock); 1876 read_unlock_bh(&idev->lock); 1877 return -EINVAL; 1878 } 1879 pmc->mca_sfcount[sfmode]--; 1880 } 1881 err = 0; 1882 for (i=0; i<sfcount; i++) { 1883 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1884 1885 changerec |= rv > 0; 1886 if (!err && rv < 0) 1887 err = rv; 1888 } 1889 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1890 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1891 pmc->mca_sfcount[MCAST_INCLUDE]) { 1892 struct ip6_sf_list *psf; 1893 1894 /* filter mode change */ 1895 pmc->mca_sfmode = MCAST_INCLUDE; 1896 pmc->mca_crcount = idev->mc_qrv; 1897 idev->mc_ifc_count = pmc->mca_crcount; 1898 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1899 psf->sf_crcount = 0; 1900 mld_ifc_event(pmc->idev); 1901 } else if (sf_setstate(pmc) || changerec) 1902 mld_ifc_event(pmc->idev); 1903 spin_unlock_bh(&pmc->mca_lock); 1904 read_unlock_bh(&idev->lock); 1905 return err; 1906 } 1907 1908 /* 1909 * Add multicast single-source filter to the interface list 1910 */ 1911 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1912 const struct in6_addr *psfsrc) 1913 { 1914 struct ip6_sf_list *psf, *psf_prev; 1915 1916 psf_prev = NULL; 1917 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1918 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1919 break; 1920 psf_prev = psf; 1921 } 1922 if (!psf) { 1923 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1924 if (!psf) 1925 return -ENOBUFS; 1926 1927 psf->sf_addr = *psfsrc; 1928 if (psf_prev) { 1929 psf_prev->sf_next = psf; 1930 } else 1931 pmc->mca_sources = psf; 1932 } 1933 psf->sf_count[sfmode]++; 1934 return 0; 1935 } 1936 1937 static void sf_markstate(struct ifmcaddr6 *pmc) 1938 { 1939 struct ip6_sf_list *psf; 1940 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1941 1942 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1943 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1944 psf->sf_oldin = mca_xcount == 1945 psf->sf_count[MCAST_EXCLUDE] && 1946 !psf->sf_count[MCAST_INCLUDE]; 1947 } else 1948 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1949 } 1950 1951 static int sf_setstate(struct ifmcaddr6 *pmc) 1952 { 1953 struct ip6_sf_list *psf, *dpsf; 1954 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1955 int qrv = pmc->idev->mc_qrv; 1956 int new_in, rv; 1957 1958 rv = 0; 1959 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1960 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1961 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1962 !psf->sf_count[MCAST_INCLUDE]; 1963 } else 1964 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1965 if (new_in) { 1966 if (!psf->sf_oldin) { 1967 struct ip6_sf_list *prev = NULL; 1968 1969 for (dpsf=pmc->mca_tomb; dpsf; 1970 dpsf=dpsf->sf_next) { 1971 if (ipv6_addr_equal(&dpsf->sf_addr, 1972 &psf->sf_addr)) 1973 break; 1974 prev = dpsf; 1975 } 1976 if (dpsf) { 1977 if (prev) 1978 prev->sf_next = dpsf->sf_next; 1979 else 1980 pmc->mca_tomb = dpsf->sf_next; 1981 kfree(dpsf); 1982 } 1983 psf->sf_crcount = qrv; 1984 rv++; 1985 } 1986 } else if (psf->sf_oldin) { 1987 psf->sf_crcount = 0; 1988 /* 1989 * add or update "delete" records if an active filter 1990 * is now inactive 1991 */ 1992 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 1993 if (ipv6_addr_equal(&dpsf->sf_addr, 1994 &psf->sf_addr)) 1995 break; 1996 if (!dpsf) { 1997 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1998 if (!dpsf) 1999 continue; 2000 *dpsf = *psf; 2001 /* pmc->mca_lock held by callers */ 2002 dpsf->sf_next = pmc->mca_tomb; 2003 pmc->mca_tomb = dpsf; 2004 } 2005 dpsf->sf_crcount = qrv; 2006 rv++; 2007 } 2008 } 2009 return rv; 2010 } 2011 2012 /* 2013 * Add multicast source filter list to the interface list 2014 */ 2015 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2016 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2017 int delta) 2018 { 2019 struct ifmcaddr6 *pmc; 2020 int isexclude; 2021 int i, err; 2022 2023 if (!idev) 2024 return -ENODEV; 2025 read_lock_bh(&idev->lock); 2026 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2027 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2028 break; 2029 } 2030 if (!pmc) { 2031 /* MCA not found?? bug */ 2032 read_unlock_bh(&idev->lock); 2033 return -ESRCH; 2034 } 2035 spin_lock_bh(&pmc->mca_lock); 2036 2037 sf_markstate(pmc); 2038 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2039 if (!delta) 2040 pmc->mca_sfcount[sfmode]++; 2041 err = 0; 2042 for (i=0; i<sfcount; i++) { 2043 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2044 if (err) 2045 break; 2046 } 2047 if (err) { 2048 int j; 2049 2050 if (!delta) 2051 pmc->mca_sfcount[sfmode]--; 2052 for (j=0; j<i; j++) 2053 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2054 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2055 struct ip6_sf_list *psf; 2056 2057 /* filter mode change */ 2058 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2059 pmc->mca_sfmode = MCAST_EXCLUDE; 2060 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2061 pmc->mca_sfmode = MCAST_INCLUDE; 2062 /* else no filters; keep old mode for reports */ 2063 2064 pmc->mca_crcount = idev->mc_qrv; 2065 idev->mc_ifc_count = pmc->mca_crcount; 2066 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2067 psf->sf_crcount = 0; 2068 mld_ifc_event(idev); 2069 } else if (sf_setstate(pmc)) 2070 mld_ifc_event(idev); 2071 spin_unlock_bh(&pmc->mca_lock); 2072 read_unlock_bh(&idev->lock); 2073 return err; 2074 } 2075 2076 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2077 { 2078 struct ip6_sf_list *psf, *nextpsf; 2079 2080 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2081 nextpsf = psf->sf_next; 2082 kfree(psf); 2083 } 2084 pmc->mca_tomb = NULL; 2085 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2086 nextpsf = psf->sf_next; 2087 kfree(psf); 2088 } 2089 pmc->mca_sources = NULL; 2090 pmc->mca_sfmode = MCAST_EXCLUDE; 2091 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2092 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2093 } 2094 2095 2096 static void igmp6_join_group(struct ifmcaddr6 *ma) 2097 { 2098 unsigned long delay; 2099 2100 if (ma->mca_flags & MAF_NOREPORT) 2101 return; 2102 2103 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2104 2105 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2106 2107 spin_lock_bh(&ma->mca_lock); 2108 if (del_timer(&ma->mca_timer)) { 2109 atomic_dec(&ma->mca_refcnt); 2110 delay = ma->mca_timer.expires - jiffies; 2111 } 2112 2113 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2114 atomic_inc(&ma->mca_refcnt); 2115 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2116 spin_unlock_bh(&ma->mca_lock); 2117 } 2118 2119 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2120 struct inet6_dev *idev) 2121 { 2122 int err; 2123 2124 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2125 * so no other readers or writers of iml or its sflist 2126 */ 2127 if (!iml->sflist) { 2128 /* any-source empty exclude case */ 2129 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2130 } 2131 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2132 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2133 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2134 iml->sflist = NULL; 2135 return err; 2136 } 2137 2138 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2139 { 2140 if (MLD_V1_SEEN(ma->idev)) { 2141 if (ma->mca_flags & MAF_LAST_REPORTER) 2142 igmp6_send(&ma->mca_addr, ma->idev->dev, 2143 ICMPV6_MGM_REDUCTION); 2144 } else { 2145 mld_add_delrec(ma->idev, ma); 2146 mld_ifc_event(ma->idev); 2147 } 2148 } 2149 2150 static void mld_gq_timer_expire(unsigned long data) 2151 { 2152 struct inet6_dev *idev = (struct inet6_dev *)data; 2153 2154 idev->mc_gq_running = 0; 2155 mld_send_report(idev, NULL); 2156 __in6_dev_put(idev); 2157 } 2158 2159 static void mld_ifc_timer_expire(unsigned long data) 2160 { 2161 struct inet6_dev *idev = (struct inet6_dev *)data; 2162 2163 mld_send_cr(idev); 2164 if (idev->mc_ifc_count) { 2165 idev->mc_ifc_count--; 2166 if (idev->mc_ifc_count) 2167 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2168 } 2169 __in6_dev_put(idev); 2170 } 2171 2172 static void mld_ifc_event(struct inet6_dev *idev) 2173 { 2174 if (MLD_V1_SEEN(idev)) 2175 return; 2176 idev->mc_ifc_count = idev->mc_qrv; 2177 mld_ifc_start_timer(idev, 1); 2178 } 2179 2180 2181 static void igmp6_timer_handler(unsigned long data) 2182 { 2183 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2184 2185 if (MLD_V1_SEEN(ma->idev)) 2186 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2187 else 2188 mld_send_report(ma->idev, ma); 2189 2190 spin_lock(&ma->mca_lock); 2191 ma->mca_flags |= MAF_LAST_REPORTER; 2192 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2193 spin_unlock(&ma->mca_lock); 2194 ma_put(ma); 2195 } 2196 2197 /* Device changing type */ 2198 2199 void ipv6_mc_unmap(struct inet6_dev *idev) 2200 { 2201 struct ifmcaddr6 *i; 2202 2203 /* Install multicast list, except for all-nodes (already installed) */ 2204 2205 read_lock_bh(&idev->lock); 2206 for (i = idev->mc_list; i; i = i->next) 2207 igmp6_group_dropped(i); 2208 read_unlock_bh(&idev->lock); 2209 } 2210 2211 void ipv6_mc_remap(struct inet6_dev *idev) 2212 { 2213 ipv6_mc_up(idev); 2214 } 2215 2216 /* Device going down */ 2217 2218 void ipv6_mc_down(struct inet6_dev *idev) 2219 { 2220 struct ifmcaddr6 *i; 2221 2222 /* Withdraw multicast list */ 2223 2224 read_lock_bh(&idev->lock); 2225 idev->mc_ifc_count = 0; 2226 if (del_timer(&idev->mc_ifc_timer)) 2227 __in6_dev_put(idev); 2228 idev->mc_gq_running = 0; 2229 if (del_timer(&idev->mc_gq_timer)) 2230 __in6_dev_put(idev); 2231 2232 for (i = idev->mc_list; i; i=i->next) 2233 igmp6_group_dropped(i); 2234 read_unlock_bh(&idev->lock); 2235 2236 mld_clear_delrec(idev); 2237 } 2238 2239 2240 /* Device going up */ 2241 2242 void ipv6_mc_up(struct inet6_dev *idev) 2243 { 2244 struct ifmcaddr6 *i; 2245 2246 /* Install multicast list, except for all-nodes (already installed) */ 2247 2248 read_lock_bh(&idev->lock); 2249 for (i = idev->mc_list; i; i=i->next) 2250 igmp6_group_added(i); 2251 read_unlock_bh(&idev->lock); 2252 } 2253 2254 /* IPv6 device initialization. */ 2255 2256 void ipv6_mc_init_dev(struct inet6_dev *idev) 2257 { 2258 write_lock_bh(&idev->lock); 2259 spin_lock_init(&idev->mc_lock); 2260 idev->mc_gq_running = 0; 2261 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2262 (unsigned long)idev); 2263 idev->mc_tomb = NULL; 2264 idev->mc_ifc_count = 0; 2265 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2266 (unsigned long)idev); 2267 idev->mc_qrv = MLD_QRV_DEFAULT; 2268 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2269 idev->mc_v1_seen = 0; 2270 write_unlock_bh(&idev->lock); 2271 } 2272 2273 /* 2274 * Device is about to be destroyed: clean up. 2275 */ 2276 2277 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2278 { 2279 struct ifmcaddr6 *i; 2280 2281 /* Deactivate timers */ 2282 ipv6_mc_down(idev); 2283 2284 /* Delete all-nodes address. */ 2285 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2286 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2287 * fail. 2288 */ 2289 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2290 2291 if (idev->cnf.forwarding) 2292 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2293 2294 write_lock_bh(&idev->lock); 2295 while ((i = idev->mc_list) != NULL) { 2296 idev->mc_list = i->next; 2297 write_unlock_bh(&idev->lock); 2298 2299 igmp6_group_dropped(i); 2300 ma_put(i); 2301 2302 write_lock_bh(&idev->lock); 2303 } 2304 write_unlock_bh(&idev->lock); 2305 } 2306 2307 #ifdef CONFIG_PROC_FS 2308 struct igmp6_mc_iter_state { 2309 struct seq_net_private p; 2310 struct net_device *dev; 2311 struct inet6_dev *idev; 2312 }; 2313 2314 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2315 2316 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2317 { 2318 struct ifmcaddr6 *im = NULL; 2319 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2320 struct net *net = seq_file_net(seq); 2321 2322 state->idev = NULL; 2323 for_each_netdev_rcu(net, state->dev) { 2324 struct inet6_dev *idev; 2325 idev = __in6_dev_get(state->dev); 2326 if (!idev) 2327 continue; 2328 read_lock_bh(&idev->lock); 2329 im = idev->mc_list; 2330 if (im) { 2331 state->idev = idev; 2332 break; 2333 } 2334 read_unlock_bh(&idev->lock); 2335 } 2336 return im; 2337 } 2338 2339 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2340 { 2341 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2342 2343 im = im->next; 2344 while (!im) { 2345 if (likely(state->idev != NULL)) 2346 read_unlock_bh(&state->idev->lock); 2347 2348 state->dev = next_net_device_rcu(state->dev); 2349 if (!state->dev) { 2350 state->idev = NULL; 2351 break; 2352 } 2353 state->idev = __in6_dev_get(state->dev); 2354 if (!state->idev) 2355 continue; 2356 read_lock_bh(&state->idev->lock); 2357 im = state->idev->mc_list; 2358 } 2359 return im; 2360 } 2361 2362 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2363 { 2364 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2365 if (im) 2366 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2367 --pos; 2368 return pos ? NULL : im; 2369 } 2370 2371 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2372 __acquires(RCU) 2373 { 2374 rcu_read_lock(); 2375 return igmp6_mc_get_idx(seq, *pos); 2376 } 2377 2378 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2379 { 2380 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2381 2382 ++*pos; 2383 return im; 2384 } 2385 2386 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2387 __releases(RCU) 2388 { 2389 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2390 2391 if (likely(state->idev != NULL)) { 2392 read_unlock_bh(&state->idev->lock); 2393 state->idev = NULL; 2394 } 2395 state->dev = NULL; 2396 rcu_read_unlock(); 2397 } 2398 2399 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2400 { 2401 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2402 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2403 2404 seq_printf(seq, 2405 "%-4d %-15s %pi6 %5d %08X %ld\n", 2406 state->dev->ifindex, state->dev->name, 2407 &im->mca_addr, 2408 im->mca_users, im->mca_flags, 2409 (im->mca_flags&MAF_TIMER_RUNNING) ? 2410 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2411 return 0; 2412 } 2413 2414 static const struct seq_operations igmp6_mc_seq_ops = { 2415 .start = igmp6_mc_seq_start, 2416 .next = igmp6_mc_seq_next, 2417 .stop = igmp6_mc_seq_stop, 2418 .show = igmp6_mc_seq_show, 2419 }; 2420 2421 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2422 { 2423 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2424 sizeof(struct igmp6_mc_iter_state)); 2425 } 2426 2427 static const struct file_operations igmp6_mc_seq_fops = { 2428 .owner = THIS_MODULE, 2429 .open = igmp6_mc_seq_open, 2430 .read = seq_read, 2431 .llseek = seq_lseek, 2432 .release = seq_release_net, 2433 }; 2434 2435 struct igmp6_mcf_iter_state { 2436 struct seq_net_private p; 2437 struct net_device *dev; 2438 struct inet6_dev *idev; 2439 struct ifmcaddr6 *im; 2440 }; 2441 2442 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2443 2444 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2445 { 2446 struct ip6_sf_list *psf = NULL; 2447 struct ifmcaddr6 *im = NULL; 2448 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2449 struct net *net = seq_file_net(seq); 2450 2451 state->idev = NULL; 2452 state->im = NULL; 2453 for_each_netdev_rcu(net, state->dev) { 2454 struct inet6_dev *idev; 2455 idev = __in6_dev_get(state->dev); 2456 if (unlikely(idev == NULL)) 2457 continue; 2458 read_lock_bh(&idev->lock); 2459 im = idev->mc_list; 2460 if (likely(im != NULL)) { 2461 spin_lock_bh(&im->mca_lock); 2462 psf = im->mca_sources; 2463 if (likely(psf != NULL)) { 2464 state->im = im; 2465 state->idev = idev; 2466 break; 2467 } 2468 spin_unlock_bh(&im->mca_lock); 2469 } 2470 read_unlock_bh(&idev->lock); 2471 } 2472 return psf; 2473 } 2474 2475 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2476 { 2477 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2478 2479 psf = psf->sf_next; 2480 while (!psf) { 2481 spin_unlock_bh(&state->im->mca_lock); 2482 state->im = state->im->next; 2483 while (!state->im) { 2484 if (likely(state->idev != NULL)) 2485 read_unlock_bh(&state->idev->lock); 2486 2487 state->dev = next_net_device_rcu(state->dev); 2488 if (!state->dev) { 2489 state->idev = NULL; 2490 goto out; 2491 } 2492 state->idev = __in6_dev_get(state->dev); 2493 if (!state->idev) 2494 continue; 2495 read_lock_bh(&state->idev->lock); 2496 state->im = state->idev->mc_list; 2497 } 2498 if (!state->im) 2499 break; 2500 spin_lock_bh(&state->im->mca_lock); 2501 psf = state->im->mca_sources; 2502 } 2503 out: 2504 return psf; 2505 } 2506 2507 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2508 { 2509 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2510 if (psf) 2511 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2512 --pos; 2513 return pos ? NULL : psf; 2514 } 2515 2516 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2517 __acquires(RCU) 2518 { 2519 rcu_read_lock(); 2520 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2521 } 2522 2523 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2524 { 2525 struct ip6_sf_list *psf; 2526 if (v == SEQ_START_TOKEN) 2527 psf = igmp6_mcf_get_first(seq); 2528 else 2529 psf = igmp6_mcf_get_next(seq, v); 2530 ++*pos; 2531 return psf; 2532 } 2533 2534 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2535 __releases(RCU) 2536 { 2537 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2538 if (likely(state->im != NULL)) { 2539 spin_unlock_bh(&state->im->mca_lock); 2540 state->im = NULL; 2541 } 2542 if (likely(state->idev != NULL)) { 2543 read_unlock_bh(&state->idev->lock); 2544 state->idev = NULL; 2545 } 2546 state->dev = NULL; 2547 rcu_read_unlock(); 2548 } 2549 2550 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2551 { 2552 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2553 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2554 2555 if (v == SEQ_START_TOKEN) { 2556 seq_printf(seq, 2557 "%3s %6s " 2558 "%32s %32s %6s %6s\n", "Idx", 2559 "Device", "Multicast Address", 2560 "Source Address", "INC", "EXC"); 2561 } else { 2562 seq_printf(seq, 2563 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2564 state->dev->ifindex, state->dev->name, 2565 &state->im->mca_addr, 2566 &psf->sf_addr, 2567 psf->sf_count[MCAST_INCLUDE], 2568 psf->sf_count[MCAST_EXCLUDE]); 2569 } 2570 return 0; 2571 } 2572 2573 static const struct seq_operations igmp6_mcf_seq_ops = { 2574 .start = igmp6_mcf_seq_start, 2575 .next = igmp6_mcf_seq_next, 2576 .stop = igmp6_mcf_seq_stop, 2577 .show = igmp6_mcf_seq_show, 2578 }; 2579 2580 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2581 { 2582 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2583 sizeof(struct igmp6_mcf_iter_state)); 2584 } 2585 2586 static const struct file_operations igmp6_mcf_seq_fops = { 2587 .owner = THIS_MODULE, 2588 .open = igmp6_mcf_seq_open, 2589 .read = seq_read, 2590 .llseek = seq_lseek, 2591 .release = seq_release_net, 2592 }; 2593 2594 static int __net_init igmp6_proc_init(struct net *net) 2595 { 2596 int err; 2597 2598 err = -ENOMEM; 2599 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2600 goto out; 2601 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2602 &igmp6_mcf_seq_fops)) 2603 goto out_proc_net_igmp6; 2604 2605 err = 0; 2606 out: 2607 return err; 2608 2609 out_proc_net_igmp6: 2610 proc_net_remove(net, "igmp6"); 2611 goto out; 2612 } 2613 2614 static void __net_exit igmp6_proc_exit(struct net *net) 2615 { 2616 proc_net_remove(net, "mcfilter6"); 2617 proc_net_remove(net, "igmp6"); 2618 } 2619 #else 2620 static inline int igmp6_proc_init(struct net *net) 2621 { 2622 return 0; 2623 } 2624 static inline void igmp6_proc_exit(struct net *net) 2625 { 2626 } 2627 #endif 2628 2629 static int __net_init igmp6_net_init(struct net *net) 2630 { 2631 int err; 2632 2633 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2634 SOCK_RAW, IPPROTO_ICMPV6, net); 2635 if (err < 0) { 2636 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2637 err); 2638 goto out; 2639 } 2640 2641 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2642 2643 err = igmp6_proc_init(net); 2644 if (err) 2645 goto out_sock_create; 2646 out: 2647 return err; 2648 2649 out_sock_create: 2650 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2651 goto out; 2652 } 2653 2654 static void __net_exit igmp6_net_exit(struct net *net) 2655 { 2656 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2657 igmp6_proc_exit(net); 2658 } 2659 2660 static struct pernet_operations igmp6_net_ops = { 2661 .init = igmp6_net_init, 2662 .exit = igmp6_net_exit, 2663 }; 2664 2665 int __init igmp6_init(void) 2666 { 2667 return register_pernet_subsys(&igmp6_net_ops); 2668 } 2669 2670 void igmp6_cleanup(void) 2671 { 2672 unregister_pernet_subsys(&igmp6_net_ops); 2673 } 2674