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 = !ipv6_addr_equal(&psl->sl_addr[i], source); 380 if (rv == 0) 381 break; 382 } 383 if (rv) /* source not found */ 384 goto done; /* err = -EADDRNOTAVAIL */ 385 386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 388 leavegroup = 1; 389 goto done; 390 } 391 392 /* update the interface filter */ 393 ip6_mc_del_src(idev, group, omode, 1, source, 1); 394 395 for (j=i+1; j<psl->sl_count; j++) 396 psl->sl_addr[j-1] = psl->sl_addr[j]; 397 psl->sl_count--; 398 err = 0; 399 goto done; 400 } 401 /* else, add a new source to the filter */ 402 403 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 404 err = -ENOBUFS; 405 goto done; 406 } 407 if (!psl || psl->sl_count == psl->sl_max) { 408 struct ip6_sf_socklist *newpsl; 409 int count = IP6_SFBLOCK; 410 411 if (psl) 412 count += psl->sl_max; 413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 414 if (!newpsl) { 415 err = -ENOBUFS; 416 goto done; 417 } 418 newpsl->sl_max = count; 419 newpsl->sl_count = count - IP6_SFBLOCK; 420 if (psl) { 421 for (i=0; i<psl->sl_count; i++) 422 newpsl->sl_addr[i] = psl->sl_addr[i]; 423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 424 } 425 pmc->sflist = psl = newpsl; 426 } 427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 428 for (i=0; i<psl->sl_count; i++) { 429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 430 if (rv == 0) /* There is an error in the address. */ 431 goto done; 432 } 433 for (j=psl->sl_count-1; j>=i; j--) 434 psl->sl_addr[j+1] = psl->sl_addr[j]; 435 psl->sl_addr[i] = *source; 436 psl->sl_count++; 437 err = 0; 438 /* update the interface list */ 439 ip6_mc_add_src(idev, group, omode, 1, source, 1); 440 done: 441 if (pmclocked) 442 write_unlock(&pmc->sflock); 443 read_unlock_bh(&idev->lock); 444 rcu_read_unlock(); 445 if (leavegroup) 446 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 447 return err; 448 } 449 450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 451 { 452 const struct in6_addr *group; 453 struct ipv6_mc_socklist *pmc; 454 struct inet6_dev *idev; 455 struct ipv6_pinfo *inet6 = inet6_sk(sk); 456 struct ip6_sf_socklist *newpsl, *psl; 457 struct net *net = sock_net(sk); 458 int leavegroup = 0; 459 int i, err; 460 461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 462 463 if (!ipv6_addr_is_multicast(group)) 464 return -EINVAL; 465 if (gsf->gf_fmode != MCAST_INCLUDE && 466 gsf->gf_fmode != MCAST_EXCLUDE) 467 return -EINVAL; 468 469 rcu_read_lock(); 470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 471 472 if (!idev) { 473 rcu_read_unlock(); 474 return -ENODEV; 475 } 476 477 err = 0; 478 479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 480 leavegroup = 1; 481 goto done; 482 } 483 484 for_each_pmc_rcu(inet6, pmc) { 485 if (pmc->ifindex != gsf->gf_interface) 486 continue; 487 if (ipv6_addr_equal(&pmc->addr, group)) 488 break; 489 } 490 if (!pmc) { /* must have a prior join */ 491 err = -EINVAL; 492 goto done; 493 } 494 if (gsf->gf_numsrc) { 495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 496 GFP_ATOMIC); 497 if (!newpsl) { 498 err = -ENOBUFS; 499 goto done; 500 } 501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 502 for (i=0; i<newpsl->sl_count; ++i) { 503 struct sockaddr_in6 *psin6; 504 505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 506 newpsl->sl_addr[i] = psin6->sin6_addr; 507 } 508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 509 newpsl->sl_count, newpsl->sl_addr, 0); 510 if (err) { 511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 512 goto done; 513 } 514 } else { 515 newpsl = NULL; 516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 517 } 518 519 write_lock(&pmc->sflock); 520 psl = pmc->sflist; 521 if (psl) { 522 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 523 psl->sl_count, psl->sl_addr, 0); 524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 525 } else 526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 527 pmc->sflist = newpsl; 528 pmc->sfmode = gsf->gf_fmode; 529 write_unlock(&pmc->sflock); 530 err = 0; 531 done: 532 read_unlock_bh(&idev->lock); 533 rcu_read_unlock(); 534 if (leavegroup) 535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 536 return err; 537 } 538 539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 540 struct group_filter __user *optval, int __user *optlen) 541 { 542 int err, i, count, copycount; 543 const struct in6_addr *group; 544 struct ipv6_mc_socklist *pmc; 545 struct inet6_dev *idev; 546 struct ipv6_pinfo *inet6 = inet6_sk(sk); 547 struct ip6_sf_socklist *psl; 548 struct net *net = sock_net(sk); 549 550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 551 552 if (!ipv6_addr_is_multicast(group)) 553 return -EINVAL; 554 555 rcu_read_lock(); 556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 557 558 if (!idev) { 559 rcu_read_unlock(); 560 return -ENODEV; 561 } 562 563 err = -EADDRNOTAVAIL; 564 /* 565 * changes to the ipv6_mc_list require the socket lock and 566 * a read lock on ip6_sk_mc_lock. We have the socket lock, 567 * so reading the list is safe. 568 */ 569 570 for_each_pmc_rcu(inet6, pmc) { 571 if (pmc->ifindex != gsf->gf_interface) 572 continue; 573 if (ipv6_addr_equal(group, &pmc->addr)) 574 break; 575 } 576 if (!pmc) /* must have a prior join */ 577 goto done; 578 gsf->gf_fmode = pmc->sfmode; 579 psl = pmc->sflist; 580 count = psl ? psl->sl_count : 0; 581 read_unlock_bh(&idev->lock); 582 rcu_read_unlock(); 583 584 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 585 gsf->gf_numsrc = count; 586 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 587 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 588 return -EFAULT; 589 } 590 /* changes to psl require the socket lock, a read lock on 591 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 592 * have the socket lock, so reading here is safe. 593 */ 594 for (i=0; i<copycount; i++) { 595 struct sockaddr_in6 *psin6; 596 struct sockaddr_storage ss; 597 598 psin6 = (struct sockaddr_in6 *)&ss; 599 memset(&ss, 0, sizeof(ss)); 600 psin6->sin6_family = AF_INET6; 601 psin6->sin6_addr = psl->sl_addr[i]; 602 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 603 return -EFAULT; 604 } 605 return 0; 606 done: 607 read_unlock_bh(&idev->lock); 608 rcu_read_unlock(); 609 return err; 610 } 611 612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 613 const struct in6_addr *src_addr) 614 { 615 struct ipv6_pinfo *np = inet6_sk(sk); 616 struct ipv6_mc_socklist *mc; 617 struct ip6_sf_socklist *psl; 618 bool rv = true; 619 620 rcu_read_lock(); 621 for_each_pmc_rcu(np, mc) { 622 if (ipv6_addr_equal(&mc->addr, mc_addr)) 623 break; 624 } 625 if (!mc) { 626 rcu_read_unlock(); 627 return true; 628 } 629 read_lock(&mc->sflock); 630 psl = mc->sflist; 631 if (!psl) { 632 rv = mc->sfmode == MCAST_EXCLUDE; 633 } else { 634 int i; 635 636 for (i=0; i<psl->sl_count; i++) { 637 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 638 break; 639 } 640 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 641 rv = false; 642 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 643 rv = false; 644 } 645 read_unlock(&mc->sflock); 646 rcu_read_unlock(); 647 648 return rv; 649 } 650 651 static void ma_put(struct ifmcaddr6 *mc) 652 { 653 if (atomic_dec_and_test(&mc->mca_refcnt)) { 654 in6_dev_put(mc->idev); 655 kfree(mc); 656 } 657 } 658 659 static void igmp6_group_added(struct ifmcaddr6 *mc) 660 { 661 struct net_device *dev = mc->idev->dev; 662 char buf[MAX_ADDR_LEN]; 663 664 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 665 IPV6_ADDR_SCOPE_LINKLOCAL) 666 return; 667 668 spin_lock_bh(&mc->mca_lock); 669 if (!(mc->mca_flags&MAF_LOADED)) { 670 mc->mca_flags |= MAF_LOADED; 671 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 672 dev_mc_add(dev, buf); 673 } 674 spin_unlock_bh(&mc->mca_lock); 675 676 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 677 return; 678 679 if (MLD_V1_SEEN(mc->idev)) { 680 igmp6_join_group(mc); 681 return; 682 } 683 /* else v2 */ 684 685 mc->mca_crcount = mc->idev->mc_qrv; 686 mld_ifc_event(mc->idev); 687 } 688 689 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 690 { 691 struct net_device *dev = mc->idev->dev; 692 char buf[MAX_ADDR_LEN]; 693 694 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 695 IPV6_ADDR_SCOPE_LINKLOCAL) 696 return; 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, const 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 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 * check if the interface/address pair is valid 944 */ 945 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 946 const struct in6_addr *src_addr) 947 { 948 struct inet6_dev *idev; 949 struct ifmcaddr6 *mc; 950 bool rv = false; 951 952 rcu_read_lock(); 953 idev = __in6_dev_get(dev); 954 if (idev) { 955 read_lock_bh(&idev->lock); 956 for (mc = idev->mc_list; mc; mc=mc->next) { 957 if (ipv6_addr_equal(&mc->mca_addr, group)) 958 break; 959 } 960 if (mc) { 961 if (src_addr && !ipv6_addr_any(src_addr)) { 962 struct ip6_sf_list *psf; 963 964 spin_lock_bh(&mc->mca_lock); 965 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 966 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 967 break; 968 } 969 if (psf) 970 rv = psf->sf_count[MCAST_INCLUDE] || 971 psf->sf_count[MCAST_EXCLUDE] != 972 mc->mca_sfcount[MCAST_EXCLUDE]; 973 else 974 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 975 spin_unlock_bh(&mc->mca_lock); 976 } else 977 rv = true; /* don't filter unspecified source */ 978 } 979 read_unlock_bh(&idev->lock); 980 } 981 rcu_read_unlock(); 982 return rv; 983 } 984 985 static void mld_gq_start_timer(struct inet6_dev *idev) 986 { 987 int tv = net_random() % idev->mc_maxdelay; 988 989 idev->mc_gq_running = 1; 990 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 991 in6_dev_hold(idev); 992 } 993 994 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 995 { 996 int tv = net_random() % delay; 997 998 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 999 in6_dev_hold(idev); 1000 } 1001 1002 /* 1003 * IGMP handling (alias multicast ICMPv6 messages) 1004 */ 1005 1006 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1007 { 1008 unsigned long delay = resptime; 1009 1010 /* Do not start timer for these addresses */ 1011 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1012 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1013 return; 1014 1015 if (del_timer(&ma->mca_timer)) { 1016 atomic_dec(&ma->mca_refcnt); 1017 delay = ma->mca_timer.expires - jiffies; 1018 } 1019 1020 if (delay >= resptime) { 1021 if (resptime) 1022 delay = net_random() % resptime; 1023 else 1024 delay = 1; 1025 } 1026 ma->mca_timer.expires = jiffies + delay; 1027 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1028 atomic_inc(&ma->mca_refcnt); 1029 ma->mca_flags |= MAF_TIMER_RUNNING; 1030 } 1031 1032 /* mark EXCLUDE-mode sources */ 1033 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1034 const struct in6_addr *srcs) 1035 { 1036 struct ip6_sf_list *psf; 1037 int i, scount; 1038 1039 scount = 0; 1040 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1041 if (scount == nsrcs) 1042 break; 1043 for (i=0; i<nsrcs; i++) { 1044 /* skip inactive filters */ 1045 if (psf->sf_count[MCAST_INCLUDE] || 1046 pmc->mca_sfcount[MCAST_EXCLUDE] != 1047 psf->sf_count[MCAST_EXCLUDE]) 1048 break; 1049 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1050 scount++; 1051 break; 1052 } 1053 } 1054 } 1055 pmc->mca_flags &= ~MAF_GSQUERY; 1056 if (scount == nsrcs) /* all sources excluded */ 1057 return false; 1058 return true; 1059 } 1060 1061 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1062 const struct in6_addr *srcs) 1063 { 1064 struct ip6_sf_list *psf; 1065 int i, scount; 1066 1067 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1068 return mld_xmarksources(pmc, nsrcs, srcs); 1069 1070 /* mark INCLUDE-mode sources */ 1071 1072 scount = 0; 1073 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1074 if (scount == nsrcs) 1075 break; 1076 for (i=0; i<nsrcs; i++) { 1077 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1078 psf->sf_gsresp = 1; 1079 scount++; 1080 break; 1081 } 1082 } 1083 } 1084 if (!scount) { 1085 pmc->mca_flags &= ~MAF_GSQUERY; 1086 return false; 1087 } 1088 pmc->mca_flags |= MAF_GSQUERY; 1089 return true; 1090 } 1091 1092 /* called with rcu_read_lock() */ 1093 int igmp6_event_query(struct sk_buff *skb) 1094 { 1095 struct mld2_query *mlh2 = NULL; 1096 struct ifmcaddr6 *ma; 1097 const struct in6_addr *group; 1098 unsigned long max_delay; 1099 struct inet6_dev *idev; 1100 struct mld_msg *mld; 1101 int group_type; 1102 int mark = 0; 1103 int len; 1104 1105 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1106 return -EINVAL; 1107 1108 /* compute payload length excluding extension headers */ 1109 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1110 len -= skb_network_header_len(skb); 1111 1112 /* Drop queries with not link local source */ 1113 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1114 return -EINVAL; 1115 1116 idev = __in6_dev_get(skb->dev); 1117 1118 if (idev == NULL) 1119 return 0; 1120 1121 mld = (struct mld_msg *)icmp6_hdr(skb); 1122 group = &mld->mld_mca; 1123 group_type = ipv6_addr_type(group); 1124 1125 if (group_type != IPV6_ADDR_ANY && 1126 !(group_type&IPV6_ADDR_MULTICAST)) 1127 return -EINVAL; 1128 1129 if (len == 24) { 1130 int switchback; 1131 /* MLDv1 router present */ 1132 1133 /* Translate milliseconds to jiffies */ 1134 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000; 1135 1136 switchback = (idev->mc_qrv + 1) * max_delay; 1137 idev->mc_v1_seen = jiffies + switchback; 1138 1139 /* cancel the interface change timer */ 1140 idev->mc_ifc_count = 0; 1141 if (del_timer(&idev->mc_ifc_timer)) 1142 __in6_dev_put(idev); 1143 /* clear deleted report items */ 1144 mld_clear_delrec(idev); 1145 } else if (len >= 28) { 1146 int srcs_offset = sizeof(struct mld2_query) - 1147 sizeof(struct icmp6hdr); 1148 if (!pskb_may_pull(skb, srcs_offset)) 1149 return -EINVAL; 1150 1151 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1152 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000; 1153 if (!max_delay) 1154 max_delay = 1; 1155 idev->mc_maxdelay = max_delay; 1156 if (mlh2->mld2q_qrv) 1157 idev->mc_qrv = mlh2->mld2q_qrv; 1158 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1159 if (mlh2->mld2q_nsrcs) 1160 return -EINVAL; /* no sources allowed */ 1161 1162 mld_gq_start_timer(idev); 1163 return 0; 1164 } 1165 /* mark sources to include, if group & source-specific */ 1166 if (mlh2->mld2q_nsrcs != 0) { 1167 if (!pskb_may_pull(skb, srcs_offset + 1168 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1169 return -EINVAL; 1170 1171 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1172 mark = 1; 1173 } 1174 } else 1175 return -EINVAL; 1176 1177 read_lock_bh(&idev->lock); 1178 if (group_type == IPV6_ADDR_ANY) { 1179 for (ma = idev->mc_list; ma; ma=ma->next) { 1180 spin_lock_bh(&ma->mca_lock); 1181 igmp6_group_queried(ma, max_delay); 1182 spin_unlock_bh(&ma->mca_lock); 1183 } 1184 } else { 1185 for (ma = idev->mc_list; ma; ma=ma->next) { 1186 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1187 continue; 1188 spin_lock_bh(&ma->mca_lock); 1189 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1190 /* gsquery <- gsquery && mark */ 1191 if (!mark) 1192 ma->mca_flags &= ~MAF_GSQUERY; 1193 } else { 1194 /* gsquery <- mark */ 1195 if (mark) 1196 ma->mca_flags |= MAF_GSQUERY; 1197 else 1198 ma->mca_flags &= ~MAF_GSQUERY; 1199 } 1200 if (!(ma->mca_flags & MAF_GSQUERY) || 1201 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1202 igmp6_group_queried(ma, max_delay); 1203 spin_unlock_bh(&ma->mca_lock); 1204 break; 1205 } 1206 } 1207 read_unlock_bh(&idev->lock); 1208 1209 return 0; 1210 } 1211 1212 /* called with rcu_read_lock() */ 1213 int igmp6_event_report(struct sk_buff *skb) 1214 { 1215 struct ifmcaddr6 *ma; 1216 struct inet6_dev *idev; 1217 struct mld_msg *mld; 1218 int addr_type; 1219 1220 /* Our own report looped back. Ignore it. */ 1221 if (skb->pkt_type == PACKET_LOOPBACK) 1222 return 0; 1223 1224 /* send our report if the MC router may not have heard this report */ 1225 if (skb->pkt_type != PACKET_MULTICAST && 1226 skb->pkt_type != PACKET_BROADCAST) 1227 return 0; 1228 1229 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1230 return -EINVAL; 1231 1232 mld = (struct mld_msg *)icmp6_hdr(skb); 1233 1234 /* Drop reports with not link local source */ 1235 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1236 if (addr_type != IPV6_ADDR_ANY && 1237 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1238 return -EINVAL; 1239 1240 idev = __in6_dev_get(skb->dev); 1241 if (idev == NULL) 1242 return -ENODEV; 1243 1244 /* 1245 * Cancel the timer for this group 1246 */ 1247 1248 read_lock_bh(&idev->lock); 1249 for (ma = idev->mc_list; ma; ma=ma->next) { 1250 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1251 spin_lock(&ma->mca_lock); 1252 if (del_timer(&ma->mca_timer)) 1253 atomic_dec(&ma->mca_refcnt); 1254 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1255 spin_unlock(&ma->mca_lock); 1256 break; 1257 } 1258 } 1259 read_unlock_bh(&idev->lock); 1260 return 0; 1261 } 1262 1263 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1264 int gdeleted, int sdeleted) 1265 { 1266 switch (type) { 1267 case MLD2_MODE_IS_INCLUDE: 1268 case MLD2_MODE_IS_EXCLUDE: 1269 if (gdeleted || sdeleted) 1270 return false; 1271 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1272 if (pmc->mca_sfmode == MCAST_INCLUDE) 1273 return true; 1274 /* don't include if this source is excluded 1275 * in all filters 1276 */ 1277 if (psf->sf_count[MCAST_INCLUDE]) 1278 return type == MLD2_MODE_IS_INCLUDE; 1279 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1280 psf->sf_count[MCAST_EXCLUDE]; 1281 } 1282 return false; 1283 case MLD2_CHANGE_TO_INCLUDE: 1284 if (gdeleted || sdeleted) 1285 return false; 1286 return psf->sf_count[MCAST_INCLUDE] != 0; 1287 case MLD2_CHANGE_TO_EXCLUDE: 1288 if (gdeleted || sdeleted) 1289 return false; 1290 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1291 psf->sf_count[MCAST_INCLUDE]) 1292 return false; 1293 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1294 psf->sf_count[MCAST_EXCLUDE]; 1295 case MLD2_ALLOW_NEW_SOURCES: 1296 if (gdeleted || !psf->sf_crcount) 1297 return false; 1298 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1299 case MLD2_BLOCK_OLD_SOURCES: 1300 if (pmc->mca_sfmode == MCAST_INCLUDE) 1301 return gdeleted || (psf->sf_crcount && sdeleted); 1302 return psf->sf_crcount && !gdeleted && !sdeleted; 1303 } 1304 return false; 1305 } 1306 1307 static int 1308 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1309 { 1310 struct ip6_sf_list *psf; 1311 int scount = 0; 1312 1313 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1314 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1315 continue; 1316 scount++; 1317 } 1318 return scount; 1319 } 1320 1321 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1322 struct net_device *dev, 1323 const struct in6_addr *saddr, 1324 const struct in6_addr *daddr, 1325 int proto, int len) 1326 { 1327 struct ipv6hdr *hdr; 1328 1329 skb->protocol = htons(ETH_P_IPV6); 1330 skb->dev = dev; 1331 1332 skb_reset_network_header(skb); 1333 skb_put(skb, sizeof(struct ipv6hdr)); 1334 hdr = ipv6_hdr(skb); 1335 1336 ip6_flow_hdr(hdr, 0, 0); 1337 1338 hdr->payload_len = htons(len); 1339 hdr->nexthdr = proto; 1340 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1341 1342 hdr->saddr = *saddr; 1343 hdr->daddr = *daddr; 1344 } 1345 1346 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1347 { 1348 struct net *net = dev_net(dev); 1349 struct sock *sk = net->ipv6.igmp_sk; 1350 struct sk_buff *skb; 1351 struct mld2_report *pmr; 1352 struct in6_addr addr_buf; 1353 const struct in6_addr *saddr; 1354 int hlen = LL_RESERVED_SPACE(dev); 1355 int tlen = dev->needed_tailroom; 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 += hlen + tlen; 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, hlen); 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_mc_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 flowi6 fl6; 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 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1422 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1423 skb->dev->ifindex); 1424 dst = icmp6_dst_alloc(skb->dev, &fl6); 1425 1426 err = 0; 1427 if (IS_ERR(dst)) { 1428 err = PTR_ERR(dst); 1429 dst = NULL; 1430 } 1431 skb_dst_set(skb, dst); 1432 if (err) 1433 goto err_out; 1434 1435 payload_len = skb->len; 1436 1437 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1438 dst_output); 1439 out: 1440 if (!err) { 1441 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1442 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1443 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1444 } else 1445 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1446 1447 rcu_read_unlock(); 1448 return; 1449 1450 err_out: 1451 kfree_skb(skb); 1452 goto out; 1453 } 1454 1455 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1456 { 1457 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1458 } 1459 1460 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1461 int type, struct mld2_grec **ppgr) 1462 { 1463 struct net_device *dev = pmc->idev->dev; 1464 struct mld2_report *pmr; 1465 struct mld2_grec *pgr; 1466 1467 if (!skb) 1468 skb = mld_newpack(dev, dev->mtu); 1469 if (!skb) 1470 return NULL; 1471 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1472 pgr->grec_type = type; 1473 pgr->grec_auxwords = 0; 1474 pgr->grec_nsrcs = 0; 1475 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1476 pmr = (struct mld2_report *)skb_transport_header(skb); 1477 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1478 *ppgr = pgr; 1479 return skb; 1480 } 1481 1482 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1483 skb_tailroom(skb)) : 0) 1484 1485 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1486 int type, int gdeleted, int sdeleted) 1487 { 1488 struct net_device *dev = pmc->idev->dev; 1489 struct mld2_report *pmr; 1490 struct mld2_grec *pgr = NULL; 1491 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1492 int scount, stotal, first, isquery, truncate; 1493 1494 if (pmc->mca_flags & MAF_NOREPORT) 1495 return skb; 1496 1497 isquery = type == MLD2_MODE_IS_INCLUDE || 1498 type == MLD2_MODE_IS_EXCLUDE; 1499 truncate = type == MLD2_MODE_IS_EXCLUDE || 1500 type == MLD2_CHANGE_TO_EXCLUDE; 1501 1502 stotal = scount = 0; 1503 1504 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1505 1506 if (!*psf_list) 1507 goto empty_source; 1508 1509 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1510 1511 /* EX and TO_EX get a fresh packet, if needed */ 1512 if (truncate) { 1513 if (pmr && pmr->mld2r_ngrec && 1514 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1515 if (skb) 1516 mld_sendpack(skb); 1517 skb = mld_newpack(dev, dev->mtu); 1518 } 1519 } 1520 first = 1; 1521 psf_prev = NULL; 1522 for (psf=*psf_list; psf; psf=psf_next) { 1523 struct in6_addr *psrc; 1524 1525 psf_next = psf->sf_next; 1526 1527 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1528 psf_prev = psf; 1529 continue; 1530 } 1531 1532 /* clear marks on query responses */ 1533 if (isquery) 1534 psf->sf_gsresp = 0; 1535 1536 if (AVAILABLE(skb) < sizeof(*psrc) + 1537 first*sizeof(struct mld2_grec)) { 1538 if (truncate && !first) 1539 break; /* truncate these */ 1540 if (pgr) 1541 pgr->grec_nsrcs = htons(scount); 1542 if (skb) 1543 mld_sendpack(skb); 1544 skb = mld_newpack(dev, dev->mtu); 1545 first = 1; 1546 scount = 0; 1547 } 1548 if (first) { 1549 skb = add_grhead(skb, pmc, type, &pgr); 1550 first = 0; 1551 } 1552 if (!skb) 1553 return NULL; 1554 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1555 *psrc = psf->sf_addr; 1556 scount++; stotal++; 1557 if ((type == MLD2_ALLOW_NEW_SOURCES || 1558 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1559 psf->sf_crcount--; 1560 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1561 if (psf_prev) 1562 psf_prev->sf_next = psf->sf_next; 1563 else 1564 *psf_list = psf->sf_next; 1565 kfree(psf); 1566 continue; 1567 } 1568 } 1569 psf_prev = psf; 1570 } 1571 1572 empty_source: 1573 if (!stotal) { 1574 if (type == MLD2_ALLOW_NEW_SOURCES || 1575 type == MLD2_BLOCK_OLD_SOURCES) 1576 return skb; 1577 if (pmc->mca_crcount || isquery) { 1578 /* make sure we have room for group header */ 1579 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1580 mld_sendpack(skb); 1581 skb = NULL; /* add_grhead will get a new one */ 1582 } 1583 skb = add_grhead(skb, pmc, type, &pgr); 1584 } 1585 } 1586 if (pgr) 1587 pgr->grec_nsrcs = htons(scount); 1588 1589 if (isquery) 1590 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1591 return skb; 1592 } 1593 1594 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1595 { 1596 struct sk_buff *skb = NULL; 1597 int type; 1598 1599 if (!pmc) { 1600 read_lock_bh(&idev->lock); 1601 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1602 if (pmc->mca_flags & MAF_NOREPORT) 1603 continue; 1604 spin_lock_bh(&pmc->mca_lock); 1605 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1606 type = MLD2_MODE_IS_EXCLUDE; 1607 else 1608 type = MLD2_MODE_IS_INCLUDE; 1609 skb = add_grec(skb, pmc, type, 0, 0); 1610 spin_unlock_bh(&pmc->mca_lock); 1611 } 1612 read_unlock_bh(&idev->lock); 1613 } else { 1614 spin_lock_bh(&pmc->mca_lock); 1615 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1616 type = MLD2_MODE_IS_EXCLUDE; 1617 else 1618 type = MLD2_MODE_IS_INCLUDE; 1619 skb = add_grec(skb, pmc, type, 0, 0); 1620 spin_unlock_bh(&pmc->mca_lock); 1621 } 1622 if (skb) 1623 mld_sendpack(skb); 1624 } 1625 1626 /* 1627 * remove zero-count source records from a source filter list 1628 */ 1629 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1630 { 1631 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1632 1633 psf_prev = NULL; 1634 for (psf=*ppsf; psf; psf = psf_next) { 1635 psf_next = psf->sf_next; 1636 if (psf->sf_crcount == 0) { 1637 if (psf_prev) 1638 psf_prev->sf_next = psf->sf_next; 1639 else 1640 *ppsf = psf->sf_next; 1641 kfree(psf); 1642 } else 1643 psf_prev = psf; 1644 } 1645 } 1646 1647 static void mld_send_cr(struct inet6_dev *idev) 1648 { 1649 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1650 struct sk_buff *skb = NULL; 1651 int type, dtype; 1652 1653 read_lock_bh(&idev->lock); 1654 spin_lock(&idev->mc_lock); 1655 1656 /* deleted MCA's */ 1657 pmc_prev = NULL; 1658 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1659 pmc_next = pmc->next; 1660 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1661 type = MLD2_BLOCK_OLD_SOURCES; 1662 dtype = MLD2_BLOCK_OLD_SOURCES; 1663 skb = add_grec(skb, pmc, type, 1, 0); 1664 skb = add_grec(skb, pmc, dtype, 1, 1); 1665 } 1666 if (pmc->mca_crcount) { 1667 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1668 type = MLD2_CHANGE_TO_INCLUDE; 1669 skb = add_grec(skb, pmc, type, 1, 0); 1670 } 1671 pmc->mca_crcount--; 1672 if (pmc->mca_crcount == 0) { 1673 mld_clear_zeros(&pmc->mca_tomb); 1674 mld_clear_zeros(&pmc->mca_sources); 1675 } 1676 } 1677 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1678 !pmc->mca_sources) { 1679 if (pmc_prev) 1680 pmc_prev->next = pmc_next; 1681 else 1682 idev->mc_tomb = pmc_next; 1683 in6_dev_put(pmc->idev); 1684 kfree(pmc); 1685 } else 1686 pmc_prev = pmc; 1687 } 1688 spin_unlock(&idev->mc_lock); 1689 1690 /* change recs */ 1691 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1692 spin_lock_bh(&pmc->mca_lock); 1693 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1694 type = MLD2_BLOCK_OLD_SOURCES; 1695 dtype = MLD2_ALLOW_NEW_SOURCES; 1696 } else { 1697 type = MLD2_ALLOW_NEW_SOURCES; 1698 dtype = MLD2_BLOCK_OLD_SOURCES; 1699 } 1700 skb = add_grec(skb, pmc, type, 0, 0); 1701 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1702 1703 /* filter mode changes */ 1704 if (pmc->mca_crcount) { 1705 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1706 type = MLD2_CHANGE_TO_EXCLUDE; 1707 else 1708 type = MLD2_CHANGE_TO_INCLUDE; 1709 skb = add_grec(skb, pmc, type, 0, 0); 1710 pmc->mca_crcount--; 1711 } 1712 spin_unlock_bh(&pmc->mca_lock); 1713 } 1714 read_unlock_bh(&idev->lock); 1715 if (!skb) 1716 return; 1717 (void) mld_sendpack(skb); 1718 } 1719 1720 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1721 { 1722 struct net *net = dev_net(dev); 1723 struct sock *sk = net->ipv6.igmp_sk; 1724 struct inet6_dev *idev; 1725 struct sk_buff *skb; 1726 struct mld_msg *hdr; 1727 const struct in6_addr *snd_addr, *saddr; 1728 struct in6_addr addr_buf; 1729 int hlen = LL_RESERVED_SPACE(dev); 1730 int tlen = dev->needed_tailroom; 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 flowi6 fl6; 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, hlen + tlen + 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, hlen); 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_mc_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 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 icmpv6_flow_init(sk, &fl6, type, 1790 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1791 skb->dev->ifindex); 1792 dst = icmp6_dst_alloc(skb->dev, &fl6); 1793 if (IS_ERR(dst)) { 1794 err = PTR_ERR(dst); 1795 goto err_out; 1796 } 1797 1798 skb_dst_set(skb, dst); 1799 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1800 dst_output); 1801 out: 1802 if (!err) { 1803 ICMP6MSGOUT_INC_STATS(net, idev, type); 1804 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1805 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1806 } else 1807 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1808 1809 rcu_read_unlock(); 1810 return; 1811 1812 err_out: 1813 kfree_skb(skb); 1814 goto out; 1815 } 1816 1817 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1818 const struct in6_addr *psfsrc) 1819 { 1820 struct ip6_sf_list *psf, *psf_prev; 1821 int rv = 0; 1822 1823 psf_prev = NULL; 1824 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1825 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1826 break; 1827 psf_prev = psf; 1828 } 1829 if (!psf || psf->sf_count[sfmode] == 0) { 1830 /* source filter not found, or count wrong => bug */ 1831 return -ESRCH; 1832 } 1833 psf->sf_count[sfmode]--; 1834 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1835 struct inet6_dev *idev = pmc->idev; 1836 1837 /* no more filters for this source */ 1838 if (psf_prev) 1839 psf_prev->sf_next = psf->sf_next; 1840 else 1841 pmc->mca_sources = psf->sf_next; 1842 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1843 !MLD_V1_SEEN(idev)) { 1844 psf->sf_crcount = idev->mc_qrv; 1845 psf->sf_next = pmc->mca_tomb; 1846 pmc->mca_tomb = psf; 1847 rv = 1; 1848 } else 1849 kfree(psf); 1850 } 1851 return rv; 1852 } 1853 1854 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 1855 int sfmode, int sfcount, const struct in6_addr *psfsrc, 1856 int delta) 1857 { 1858 struct ifmcaddr6 *pmc; 1859 int changerec = 0; 1860 int i, err; 1861 1862 if (!idev) 1863 return -ENODEV; 1864 read_lock_bh(&idev->lock); 1865 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1866 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1867 break; 1868 } 1869 if (!pmc) { 1870 /* MCA not found?? bug */ 1871 read_unlock_bh(&idev->lock); 1872 return -ESRCH; 1873 } 1874 spin_lock_bh(&pmc->mca_lock); 1875 sf_markstate(pmc); 1876 if (!delta) { 1877 if (!pmc->mca_sfcount[sfmode]) { 1878 spin_unlock_bh(&pmc->mca_lock); 1879 read_unlock_bh(&idev->lock); 1880 return -EINVAL; 1881 } 1882 pmc->mca_sfcount[sfmode]--; 1883 } 1884 err = 0; 1885 for (i=0; i<sfcount; i++) { 1886 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1887 1888 changerec |= rv > 0; 1889 if (!err && rv < 0) 1890 err = rv; 1891 } 1892 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1893 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1894 pmc->mca_sfcount[MCAST_INCLUDE]) { 1895 struct ip6_sf_list *psf; 1896 1897 /* filter mode change */ 1898 pmc->mca_sfmode = MCAST_INCLUDE; 1899 pmc->mca_crcount = idev->mc_qrv; 1900 idev->mc_ifc_count = pmc->mca_crcount; 1901 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1902 psf->sf_crcount = 0; 1903 mld_ifc_event(pmc->idev); 1904 } else if (sf_setstate(pmc) || changerec) 1905 mld_ifc_event(pmc->idev); 1906 spin_unlock_bh(&pmc->mca_lock); 1907 read_unlock_bh(&idev->lock); 1908 return err; 1909 } 1910 1911 /* 1912 * Add multicast single-source filter to the interface list 1913 */ 1914 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1915 const struct in6_addr *psfsrc) 1916 { 1917 struct ip6_sf_list *psf, *psf_prev; 1918 1919 psf_prev = NULL; 1920 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1921 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1922 break; 1923 psf_prev = psf; 1924 } 1925 if (!psf) { 1926 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1927 if (!psf) 1928 return -ENOBUFS; 1929 1930 psf->sf_addr = *psfsrc; 1931 if (psf_prev) { 1932 psf_prev->sf_next = psf; 1933 } else 1934 pmc->mca_sources = psf; 1935 } 1936 psf->sf_count[sfmode]++; 1937 return 0; 1938 } 1939 1940 static void sf_markstate(struct ifmcaddr6 *pmc) 1941 { 1942 struct ip6_sf_list *psf; 1943 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1944 1945 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1946 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1947 psf->sf_oldin = mca_xcount == 1948 psf->sf_count[MCAST_EXCLUDE] && 1949 !psf->sf_count[MCAST_INCLUDE]; 1950 } else 1951 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1952 } 1953 1954 static int sf_setstate(struct ifmcaddr6 *pmc) 1955 { 1956 struct ip6_sf_list *psf, *dpsf; 1957 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1958 int qrv = pmc->idev->mc_qrv; 1959 int new_in, rv; 1960 1961 rv = 0; 1962 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1963 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1964 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1965 !psf->sf_count[MCAST_INCLUDE]; 1966 } else 1967 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1968 if (new_in) { 1969 if (!psf->sf_oldin) { 1970 struct ip6_sf_list *prev = NULL; 1971 1972 for (dpsf=pmc->mca_tomb; dpsf; 1973 dpsf=dpsf->sf_next) { 1974 if (ipv6_addr_equal(&dpsf->sf_addr, 1975 &psf->sf_addr)) 1976 break; 1977 prev = dpsf; 1978 } 1979 if (dpsf) { 1980 if (prev) 1981 prev->sf_next = dpsf->sf_next; 1982 else 1983 pmc->mca_tomb = dpsf->sf_next; 1984 kfree(dpsf); 1985 } 1986 psf->sf_crcount = qrv; 1987 rv++; 1988 } 1989 } else if (psf->sf_oldin) { 1990 psf->sf_crcount = 0; 1991 /* 1992 * add or update "delete" records if an active filter 1993 * is now inactive 1994 */ 1995 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 1996 if (ipv6_addr_equal(&dpsf->sf_addr, 1997 &psf->sf_addr)) 1998 break; 1999 if (!dpsf) { 2000 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2001 if (!dpsf) 2002 continue; 2003 *dpsf = *psf; 2004 /* pmc->mca_lock held by callers */ 2005 dpsf->sf_next = pmc->mca_tomb; 2006 pmc->mca_tomb = dpsf; 2007 } 2008 dpsf->sf_crcount = qrv; 2009 rv++; 2010 } 2011 } 2012 return rv; 2013 } 2014 2015 /* 2016 * Add multicast source filter list to the interface list 2017 */ 2018 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2019 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2020 int delta) 2021 { 2022 struct ifmcaddr6 *pmc; 2023 int isexclude; 2024 int i, err; 2025 2026 if (!idev) 2027 return -ENODEV; 2028 read_lock_bh(&idev->lock); 2029 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2030 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2031 break; 2032 } 2033 if (!pmc) { 2034 /* MCA not found?? bug */ 2035 read_unlock_bh(&idev->lock); 2036 return -ESRCH; 2037 } 2038 spin_lock_bh(&pmc->mca_lock); 2039 2040 sf_markstate(pmc); 2041 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2042 if (!delta) 2043 pmc->mca_sfcount[sfmode]++; 2044 err = 0; 2045 for (i=0; i<sfcount; i++) { 2046 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2047 if (err) 2048 break; 2049 } 2050 if (err) { 2051 int j; 2052 2053 if (!delta) 2054 pmc->mca_sfcount[sfmode]--; 2055 for (j=0; j<i; j++) 2056 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2057 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2058 struct ip6_sf_list *psf; 2059 2060 /* filter mode change */ 2061 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2062 pmc->mca_sfmode = MCAST_EXCLUDE; 2063 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2064 pmc->mca_sfmode = MCAST_INCLUDE; 2065 /* else no filters; keep old mode for reports */ 2066 2067 pmc->mca_crcount = idev->mc_qrv; 2068 idev->mc_ifc_count = pmc->mca_crcount; 2069 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2070 psf->sf_crcount = 0; 2071 mld_ifc_event(idev); 2072 } else if (sf_setstate(pmc)) 2073 mld_ifc_event(idev); 2074 spin_unlock_bh(&pmc->mca_lock); 2075 read_unlock_bh(&idev->lock); 2076 return err; 2077 } 2078 2079 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2080 { 2081 struct ip6_sf_list *psf, *nextpsf; 2082 2083 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2084 nextpsf = psf->sf_next; 2085 kfree(psf); 2086 } 2087 pmc->mca_tomb = NULL; 2088 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2089 nextpsf = psf->sf_next; 2090 kfree(psf); 2091 } 2092 pmc->mca_sources = NULL; 2093 pmc->mca_sfmode = MCAST_EXCLUDE; 2094 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2095 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2096 } 2097 2098 2099 static void igmp6_join_group(struct ifmcaddr6 *ma) 2100 { 2101 unsigned long delay; 2102 2103 if (ma->mca_flags & MAF_NOREPORT) 2104 return; 2105 2106 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2107 2108 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2109 2110 spin_lock_bh(&ma->mca_lock); 2111 if (del_timer(&ma->mca_timer)) { 2112 atomic_dec(&ma->mca_refcnt); 2113 delay = ma->mca_timer.expires - jiffies; 2114 } 2115 2116 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2117 atomic_inc(&ma->mca_refcnt); 2118 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2119 spin_unlock_bh(&ma->mca_lock); 2120 } 2121 2122 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2123 struct inet6_dev *idev) 2124 { 2125 int err; 2126 2127 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2128 * so no other readers or writers of iml or its sflist 2129 */ 2130 if (!iml->sflist) { 2131 /* any-source empty exclude case */ 2132 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2133 } 2134 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2135 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2136 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2137 iml->sflist = NULL; 2138 return err; 2139 } 2140 2141 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2142 { 2143 if (MLD_V1_SEEN(ma->idev)) { 2144 if (ma->mca_flags & MAF_LAST_REPORTER) 2145 igmp6_send(&ma->mca_addr, ma->idev->dev, 2146 ICMPV6_MGM_REDUCTION); 2147 } else { 2148 mld_add_delrec(ma->idev, ma); 2149 mld_ifc_event(ma->idev); 2150 } 2151 } 2152 2153 static void mld_gq_timer_expire(unsigned long data) 2154 { 2155 struct inet6_dev *idev = (struct inet6_dev *)data; 2156 2157 idev->mc_gq_running = 0; 2158 mld_send_report(idev, NULL); 2159 __in6_dev_put(idev); 2160 } 2161 2162 static void mld_ifc_timer_expire(unsigned long data) 2163 { 2164 struct inet6_dev *idev = (struct inet6_dev *)data; 2165 2166 mld_send_cr(idev); 2167 if (idev->mc_ifc_count) { 2168 idev->mc_ifc_count--; 2169 if (idev->mc_ifc_count) 2170 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2171 } 2172 __in6_dev_put(idev); 2173 } 2174 2175 static void mld_ifc_event(struct inet6_dev *idev) 2176 { 2177 if (MLD_V1_SEEN(idev)) 2178 return; 2179 idev->mc_ifc_count = idev->mc_qrv; 2180 mld_ifc_start_timer(idev, 1); 2181 } 2182 2183 2184 static void igmp6_timer_handler(unsigned long data) 2185 { 2186 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2187 2188 if (MLD_V1_SEEN(ma->idev)) 2189 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2190 else 2191 mld_send_report(ma->idev, ma); 2192 2193 spin_lock(&ma->mca_lock); 2194 ma->mca_flags |= MAF_LAST_REPORTER; 2195 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2196 spin_unlock(&ma->mca_lock); 2197 ma_put(ma); 2198 } 2199 2200 /* Device changing type */ 2201 2202 void ipv6_mc_unmap(struct inet6_dev *idev) 2203 { 2204 struct ifmcaddr6 *i; 2205 2206 /* Install multicast list, except for all-nodes (already installed) */ 2207 2208 read_lock_bh(&idev->lock); 2209 for (i = idev->mc_list; i; i = i->next) 2210 igmp6_group_dropped(i); 2211 read_unlock_bh(&idev->lock); 2212 } 2213 2214 void ipv6_mc_remap(struct inet6_dev *idev) 2215 { 2216 ipv6_mc_up(idev); 2217 } 2218 2219 /* Device going down */ 2220 2221 void ipv6_mc_down(struct inet6_dev *idev) 2222 { 2223 struct ifmcaddr6 *i; 2224 2225 /* Withdraw multicast list */ 2226 2227 read_lock_bh(&idev->lock); 2228 idev->mc_ifc_count = 0; 2229 if (del_timer(&idev->mc_ifc_timer)) 2230 __in6_dev_put(idev); 2231 idev->mc_gq_running = 0; 2232 if (del_timer(&idev->mc_gq_timer)) 2233 __in6_dev_put(idev); 2234 2235 for (i = idev->mc_list; i; i=i->next) 2236 igmp6_group_dropped(i); 2237 read_unlock_bh(&idev->lock); 2238 2239 mld_clear_delrec(idev); 2240 } 2241 2242 2243 /* Device going up */ 2244 2245 void ipv6_mc_up(struct inet6_dev *idev) 2246 { 2247 struct ifmcaddr6 *i; 2248 2249 /* Install multicast list, except for all-nodes (already installed) */ 2250 2251 read_lock_bh(&idev->lock); 2252 for (i = idev->mc_list; i; i=i->next) 2253 igmp6_group_added(i); 2254 read_unlock_bh(&idev->lock); 2255 } 2256 2257 /* IPv6 device initialization. */ 2258 2259 void ipv6_mc_init_dev(struct inet6_dev *idev) 2260 { 2261 write_lock_bh(&idev->lock); 2262 spin_lock_init(&idev->mc_lock); 2263 idev->mc_gq_running = 0; 2264 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2265 (unsigned long)idev); 2266 idev->mc_tomb = NULL; 2267 idev->mc_ifc_count = 0; 2268 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2269 (unsigned long)idev); 2270 idev->mc_qrv = MLD_QRV_DEFAULT; 2271 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2272 idev->mc_v1_seen = 0; 2273 write_unlock_bh(&idev->lock); 2274 } 2275 2276 /* 2277 * Device is about to be destroyed: clean up. 2278 */ 2279 2280 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2281 { 2282 struct ifmcaddr6 *i; 2283 2284 /* Deactivate timers */ 2285 ipv6_mc_down(idev); 2286 2287 /* Delete all-nodes address. */ 2288 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2289 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2290 * fail. 2291 */ 2292 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2293 2294 if (idev->cnf.forwarding) 2295 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2296 2297 write_lock_bh(&idev->lock); 2298 while ((i = idev->mc_list) != NULL) { 2299 idev->mc_list = i->next; 2300 write_unlock_bh(&idev->lock); 2301 2302 igmp6_group_dropped(i); 2303 ma_put(i); 2304 2305 write_lock_bh(&idev->lock); 2306 } 2307 write_unlock_bh(&idev->lock); 2308 } 2309 2310 #ifdef CONFIG_PROC_FS 2311 struct igmp6_mc_iter_state { 2312 struct seq_net_private p; 2313 struct net_device *dev; 2314 struct inet6_dev *idev; 2315 }; 2316 2317 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2318 2319 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2320 { 2321 struct ifmcaddr6 *im = NULL; 2322 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2323 struct net *net = seq_file_net(seq); 2324 2325 state->idev = NULL; 2326 for_each_netdev_rcu(net, state->dev) { 2327 struct inet6_dev *idev; 2328 idev = __in6_dev_get(state->dev); 2329 if (!idev) 2330 continue; 2331 read_lock_bh(&idev->lock); 2332 im = idev->mc_list; 2333 if (im) { 2334 state->idev = idev; 2335 break; 2336 } 2337 read_unlock_bh(&idev->lock); 2338 } 2339 return im; 2340 } 2341 2342 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2343 { 2344 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2345 2346 im = im->next; 2347 while (!im) { 2348 if (likely(state->idev != NULL)) 2349 read_unlock_bh(&state->idev->lock); 2350 2351 state->dev = next_net_device_rcu(state->dev); 2352 if (!state->dev) { 2353 state->idev = NULL; 2354 break; 2355 } 2356 state->idev = __in6_dev_get(state->dev); 2357 if (!state->idev) 2358 continue; 2359 read_lock_bh(&state->idev->lock); 2360 im = state->idev->mc_list; 2361 } 2362 return im; 2363 } 2364 2365 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2366 { 2367 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2368 if (im) 2369 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2370 --pos; 2371 return pos ? NULL : im; 2372 } 2373 2374 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2375 __acquires(RCU) 2376 { 2377 rcu_read_lock(); 2378 return igmp6_mc_get_idx(seq, *pos); 2379 } 2380 2381 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2382 { 2383 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2384 2385 ++*pos; 2386 return im; 2387 } 2388 2389 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2390 __releases(RCU) 2391 { 2392 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2393 2394 if (likely(state->idev != NULL)) { 2395 read_unlock_bh(&state->idev->lock); 2396 state->idev = NULL; 2397 } 2398 state->dev = NULL; 2399 rcu_read_unlock(); 2400 } 2401 2402 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2403 { 2404 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2405 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2406 2407 seq_printf(seq, 2408 "%-4d %-15s %pi6 %5d %08X %ld\n", 2409 state->dev->ifindex, state->dev->name, 2410 &im->mca_addr, 2411 im->mca_users, im->mca_flags, 2412 (im->mca_flags&MAF_TIMER_RUNNING) ? 2413 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2414 return 0; 2415 } 2416 2417 static const struct seq_operations igmp6_mc_seq_ops = { 2418 .start = igmp6_mc_seq_start, 2419 .next = igmp6_mc_seq_next, 2420 .stop = igmp6_mc_seq_stop, 2421 .show = igmp6_mc_seq_show, 2422 }; 2423 2424 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2425 { 2426 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2427 sizeof(struct igmp6_mc_iter_state)); 2428 } 2429 2430 static const struct file_operations igmp6_mc_seq_fops = { 2431 .owner = THIS_MODULE, 2432 .open = igmp6_mc_seq_open, 2433 .read = seq_read, 2434 .llseek = seq_lseek, 2435 .release = seq_release_net, 2436 }; 2437 2438 struct igmp6_mcf_iter_state { 2439 struct seq_net_private p; 2440 struct net_device *dev; 2441 struct inet6_dev *idev; 2442 struct ifmcaddr6 *im; 2443 }; 2444 2445 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2446 2447 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2448 { 2449 struct ip6_sf_list *psf = NULL; 2450 struct ifmcaddr6 *im = NULL; 2451 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2452 struct net *net = seq_file_net(seq); 2453 2454 state->idev = NULL; 2455 state->im = NULL; 2456 for_each_netdev_rcu(net, state->dev) { 2457 struct inet6_dev *idev; 2458 idev = __in6_dev_get(state->dev); 2459 if (unlikely(idev == NULL)) 2460 continue; 2461 read_lock_bh(&idev->lock); 2462 im = idev->mc_list; 2463 if (likely(im != NULL)) { 2464 spin_lock_bh(&im->mca_lock); 2465 psf = im->mca_sources; 2466 if (likely(psf != NULL)) { 2467 state->im = im; 2468 state->idev = idev; 2469 break; 2470 } 2471 spin_unlock_bh(&im->mca_lock); 2472 } 2473 read_unlock_bh(&idev->lock); 2474 } 2475 return psf; 2476 } 2477 2478 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2479 { 2480 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2481 2482 psf = psf->sf_next; 2483 while (!psf) { 2484 spin_unlock_bh(&state->im->mca_lock); 2485 state->im = state->im->next; 2486 while (!state->im) { 2487 if (likely(state->idev != NULL)) 2488 read_unlock_bh(&state->idev->lock); 2489 2490 state->dev = next_net_device_rcu(state->dev); 2491 if (!state->dev) { 2492 state->idev = NULL; 2493 goto out; 2494 } 2495 state->idev = __in6_dev_get(state->dev); 2496 if (!state->idev) 2497 continue; 2498 read_lock_bh(&state->idev->lock); 2499 state->im = state->idev->mc_list; 2500 } 2501 if (!state->im) 2502 break; 2503 spin_lock_bh(&state->im->mca_lock); 2504 psf = state->im->mca_sources; 2505 } 2506 out: 2507 return psf; 2508 } 2509 2510 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2511 { 2512 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2513 if (psf) 2514 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2515 --pos; 2516 return pos ? NULL : psf; 2517 } 2518 2519 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2520 __acquires(RCU) 2521 { 2522 rcu_read_lock(); 2523 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2524 } 2525 2526 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2527 { 2528 struct ip6_sf_list *psf; 2529 if (v == SEQ_START_TOKEN) 2530 psf = igmp6_mcf_get_first(seq); 2531 else 2532 psf = igmp6_mcf_get_next(seq, v); 2533 ++*pos; 2534 return psf; 2535 } 2536 2537 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2538 __releases(RCU) 2539 { 2540 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2541 if (likely(state->im != NULL)) { 2542 spin_unlock_bh(&state->im->mca_lock); 2543 state->im = NULL; 2544 } 2545 if (likely(state->idev != NULL)) { 2546 read_unlock_bh(&state->idev->lock); 2547 state->idev = NULL; 2548 } 2549 state->dev = NULL; 2550 rcu_read_unlock(); 2551 } 2552 2553 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2554 { 2555 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2556 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2557 2558 if (v == SEQ_START_TOKEN) { 2559 seq_printf(seq, 2560 "%3s %6s " 2561 "%32s %32s %6s %6s\n", "Idx", 2562 "Device", "Multicast Address", 2563 "Source Address", "INC", "EXC"); 2564 } else { 2565 seq_printf(seq, 2566 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2567 state->dev->ifindex, state->dev->name, 2568 &state->im->mca_addr, 2569 &psf->sf_addr, 2570 psf->sf_count[MCAST_INCLUDE], 2571 psf->sf_count[MCAST_EXCLUDE]); 2572 } 2573 return 0; 2574 } 2575 2576 static const struct seq_operations igmp6_mcf_seq_ops = { 2577 .start = igmp6_mcf_seq_start, 2578 .next = igmp6_mcf_seq_next, 2579 .stop = igmp6_mcf_seq_stop, 2580 .show = igmp6_mcf_seq_show, 2581 }; 2582 2583 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2584 { 2585 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2586 sizeof(struct igmp6_mcf_iter_state)); 2587 } 2588 2589 static const struct file_operations igmp6_mcf_seq_fops = { 2590 .owner = THIS_MODULE, 2591 .open = igmp6_mcf_seq_open, 2592 .read = seq_read, 2593 .llseek = seq_lseek, 2594 .release = seq_release_net, 2595 }; 2596 2597 static int __net_init igmp6_proc_init(struct net *net) 2598 { 2599 int err; 2600 2601 err = -ENOMEM; 2602 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) 2603 goto out; 2604 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, 2605 &igmp6_mcf_seq_fops)) 2606 goto out_proc_net_igmp6; 2607 2608 err = 0; 2609 out: 2610 return err; 2611 2612 out_proc_net_igmp6: 2613 remove_proc_entry("igmp6", net->proc_net); 2614 goto out; 2615 } 2616 2617 static void __net_exit igmp6_proc_exit(struct net *net) 2618 { 2619 remove_proc_entry("mcfilter6", net->proc_net); 2620 remove_proc_entry("igmp6", net->proc_net); 2621 } 2622 #else 2623 static inline int igmp6_proc_init(struct net *net) 2624 { 2625 return 0; 2626 } 2627 static inline void igmp6_proc_exit(struct net *net) 2628 { 2629 } 2630 #endif 2631 2632 static int __net_init igmp6_net_init(struct net *net) 2633 { 2634 int err; 2635 2636 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2637 SOCK_RAW, IPPROTO_ICMPV6, net); 2638 if (err < 0) { 2639 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2640 err); 2641 goto out; 2642 } 2643 2644 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2645 2646 err = igmp6_proc_init(net); 2647 if (err) 2648 goto out_sock_create; 2649 out: 2650 return err; 2651 2652 out_sock_create: 2653 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2654 goto out; 2655 } 2656 2657 static void __net_exit igmp6_net_exit(struct net *net) 2658 { 2659 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2660 igmp6_proc_exit(net); 2661 } 2662 2663 static struct pernet_operations igmp6_net_ops = { 2664 .init = igmp6_net_init, 2665 .exit = igmp6_net_exit, 2666 }; 2667 2668 int __init igmp6_init(void) 2669 { 2670 return register_pernet_subsys(&igmp6_net_ops); 2671 } 2672 2673 void igmp6_cleanup(void) 2674 { 2675 unregister_pernet_subsys(&igmp6_net_ops); 2676 } 2677