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 <linux/pkt_sched.h> 48 #include <net/mld.h> 49 50 #include <linux/netfilter.h> 51 #include <linux/netfilter_ipv6.h> 52 53 #include <net/net_namespace.h> 54 #include <net/sock.h> 55 #include <net/snmp.h> 56 57 #include <net/ipv6.h> 58 #include <net/protocol.h> 59 #include <net/if_inet6.h> 60 #include <net/ndisc.h> 61 #include <net/addrconf.h> 62 #include <net/ip6_route.h> 63 #include <net/inet_common.h> 64 65 #include <net/ip6_checksum.h> 66 67 /* Set to 3 to get tracing... */ 68 #define MCAST_DEBUG 2 69 70 #if MCAST_DEBUG >= 3 71 #define MDBG(x) printk x 72 #else 73 #define MDBG(x) 74 #endif 75 76 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = { 78 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4), 79 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4), 80 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4) 81 }; 82 83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 84 85 /* Big mc list lock for all the sockets */ 86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock); 87 88 static void igmp6_join_group(struct ifmcaddr6 *ma); 89 static void igmp6_leave_group(struct ifmcaddr6 *ma); 90 static void igmp6_timer_handler(unsigned long data); 91 92 static void mld_gq_timer_expire(unsigned long data); 93 static void mld_ifc_timer_expire(unsigned long data); 94 static void mld_ifc_event(struct inet6_dev *idev); 95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr); 97 static void mld_clear_delrec(struct inet6_dev *idev); 98 static bool mld_in_v1_mode(const struct inet6_dev *idev); 99 static int sf_setstate(struct ifmcaddr6 *pmc); 100 static void sf_markstate(struct ifmcaddr6 *pmc); 101 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 102 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 103 int sfmode, int sfcount, const struct in6_addr *psfsrc, 104 int delta); 105 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 106 int sfmode, int sfcount, const struct in6_addr *psfsrc, 107 int delta); 108 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 109 struct inet6_dev *idev); 110 111 #define MLD_QRV_DEFAULT 2 112 /* RFC3810, 9.2. Query Interval */ 113 #define MLD_QI_DEFAULT (125 * HZ) 114 /* RFC3810, 9.3. Query Response Interval */ 115 #define MLD_QRI_DEFAULT (10 * HZ) 116 117 /* RFC3810, 8.1 Query Version Distinctions */ 118 #define MLD_V1_QUERY_LEN 24 119 #define MLD_V2_QUERY_LEN_MIN 28 120 121 #define IPV6_MLD_MAX_MSF 64 122 123 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 124 125 /* 126 * socket join on multicast group 127 */ 128 129 #define for_each_pmc_rcu(np, pmc) \ 130 for (pmc = rcu_dereference(np->ipv6_mc_list); \ 131 pmc != NULL; \ 132 pmc = rcu_dereference(pmc->next)) 133 134 static int unsolicited_report_interval(struct inet6_dev *idev) 135 { 136 int iv; 137 138 if (mld_in_v1_mode(idev)) 139 iv = idev->cnf.mldv1_unsolicited_report_interval; 140 else 141 iv = idev->cnf.mldv2_unsolicited_report_interval; 142 143 return iv > 0 ? iv : 1; 144 } 145 146 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 147 { 148 struct net_device *dev = NULL; 149 struct ipv6_mc_socklist *mc_lst; 150 struct ipv6_pinfo *np = inet6_sk(sk); 151 struct net *net = sock_net(sk); 152 int err; 153 154 if (!ipv6_addr_is_multicast(addr)) 155 return -EINVAL; 156 157 rcu_read_lock(); 158 for_each_pmc_rcu(np, mc_lst) { 159 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 160 ipv6_addr_equal(&mc_lst->addr, addr)) { 161 rcu_read_unlock(); 162 return -EADDRINUSE; 163 } 164 } 165 rcu_read_unlock(); 166 167 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 168 169 if (mc_lst == NULL) 170 return -ENOMEM; 171 172 mc_lst->next = NULL; 173 mc_lst->addr = *addr; 174 175 rcu_read_lock(); 176 if (ifindex == 0) { 177 struct rt6_info *rt; 178 rt = rt6_lookup(net, addr, NULL, 0, 0); 179 if (rt) { 180 dev = rt->dst.dev; 181 ip6_rt_put(rt); 182 } 183 } else 184 dev = dev_get_by_index_rcu(net, ifindex); 185 186 if (dev == NULL) { 187 rcu_read_unlock(); 188 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 189 return -ENODEV; 190 } 191 192 mc_lst->ifindex = dev->ifindex; 193 mc_lst->sfmode = MCAST_EXCLUDE; 194 rwlock_init(&mc_lst->sflock); 195 mc_lst->sflist = NULL; 196 197 /* 198 * now add/increase the group membership on the device 199 */ 200 201 err = ipv6_dev_mc_inc(dev, addr); 202 203 if (err) { 204 rcu_read_unlock(); 205 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 206 return err; 207 } 208 209 spin_lock(&ipv6_sk_mc_lock); 210 mc_lst->next = np->ipv6_mc_list; 211 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 212 spin_unlock(&ipv6_sk_mc_lock); 213 214 rcu_read_unlock(); 215 216 return 0; 217 } 218 219 /* 220 * socket leave on multicast group 221 */ 222 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 223 { 224 struct ipv6_pinfo *np = inet6_sk(sk); 225 struct ipv6_mc_socklist *mc_lst; 226 struct ipv6_mc_socklist __rcu **lnk; 227 struct net *net = sock_net(sk); 228 229 if (!ipv6_addr_is_multicast(addr)) 230 return -EINVAL; 231 232 spin_lock(&ipv6_sk_mc_lock); 233 for (lnk = &np->ipv6_mc_list; 234 (mc_lst = rcu_dereference_protected(*lnk, 235 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ; 236 lnk = &mc_lst->next) { 237 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 238 ipv6_addr_equal(&mc_lst->addr, addr)) { 239 struct net_device *dev; 240 241 *lnk = mc_lst->next; 242 spin_unlock(&ipv6_sk_mc_lock); 243 244 rcu_read_lock(); 245 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 246 if (dev != NULL) { 247 struct inet6_dev *idev = __in6_dev_get(dev); 248 249 (void) ip6_mc_leave_src(sk, mc_lst, idev); 250 if (idev) 251 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 252 } else 253 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 254 rcu_read_unlock(); 255 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 256 kfree_rcu(mc_lst, rcu); 257 return 0; 258 } 259 } 260 spin_unlock(&ipv6_sk_mc_lock); 261 262 return -EADDRNOTAVAIL; 263 } 264 265 /* called with rcu_read_lock() */ 266 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 267 const struct in6_addr *group, 268 int ifindex) 269 { 270 struct net_device *dev = NULL; 271 struct inet6_dev *idev = NULL; 272 273 if (ifindex == 0) { 274 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); 275 276 if (rt) { 277 dev = rt->dst.dev; 278 ip6_rt_put(rt); 279 } 280 } else 281 dev = dev_get_by_index_rcu(net, ifindex); 282 283 if (!dev) 284 return NULL; 285 idev = __in6_dev_get(dev); 286 if (!idev) 287 return NULL; 288 read_lock_bh(&idev->lock); 289 if (idev->dead) { 290 read_unlock_bh(&idev->lock); 291 return NULL; 292 } 293 return idev; 294 } 295 296 void ipv6_sock_mc_close(struct sock *sk) 297 { 298 struct ipv6_pinfo *np = inet6_sk(sk); 299 struct ipv6_mc_socklist *mc_lst; 300 struct net *net = sock_net(sk); 301 302 if (!rcu_access_pointer(np->ipv6_mc_list)) 303 return; 304 305 spin_lock(&ipv6_sk_mc_lock); 306 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list, 307 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) { 308 struct net_device *dev; 309 310 np->ipv6_mc_list = mc_lst->next; 311 spin_unlock(&ipv6_sk_mc_lock); 312 313 rcu_read_lock(); 314 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 315 if (dev) { 316 struct inet6_dev *idev = __in6_dev_get(dev); 317 318 (void) ip6_mc_leave_src(sk, mc_lst, idev); 319 if (idev) 320 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 321 } else 322 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 323 rcu_read_unlock(); 324 325 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 326 kfree_rcu(mc_lst, rcu); 327 328 spin_lock(&ipv6_sk_mc_lock); 329 } 330 spin_unlock(&ipv6_sk_mc_lock); 331 } 332 333 int ip6_mc_source(int add, int omode, struct sock *sk, 334 struct group_source_req *pgsr) 335 { 336 struct in6_addr *source, *group; 337 struct ipv6_mc_socklist *pmc; 338 struct inet6_dev *idev; 339 struct ipv6_pinfo *inet6 = inet6_sk(sk); 340 struct ip6_sf_socklist *psl; 341 struct net *net = sock_net(sk); 342 int i, j, rv; 343 int leavegroup = 0; 344 int pmclocked = 0; 345 int err; 346 347 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 348 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 349 350 if (!ipv6_addr_is_multicast(group)) 351 return -EINVAL; 352 353 rcu_read_lock(); 354 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 355 if (!idev) { 356 rcu_read_unlock(); 357 return -ENODEV; 358 } 359 360 err = -EADDRNOTAVAIL; 361 362 for_each_pmc_rcu(inet6, pmc) { 363 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 364 continue; 365 if (ipv6_addr_equal(&pmc->addr, group)) 366 break; 367 } 368 if (!pmc) { /* must have a prior join */ 369 err = -EINVAL; 370 goto done; 371 } 372 /* if a source filter was set, must be the same mode as before */ 373 if (pmc->sflist) { 374 if (pmc->sfmode != omode) { 375 err = -EINVAL; 376 goto done; 377 } 378 } else if (pmc->sfmode != omode) { 379 /* allow mode switches for empty-set filters */ 380 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 381 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 382 pmc->sfmode = omode; 383 } 384 385 write_lock(&pmc->sflock); 386 pmclocked = 1; 387 388 psl = pmc->sflist; 389 if (!add) { 390 if (!psl) 391 goto done; /* err = -EADDRNOTAVAIL */ 392 rv = !0; 393 for (i=0; i<psl->sl_count; i++) { 394 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 395 if (rv == 0) 396 break; 397 } 398 if (rv) /* source not found */ 399 goto done; /* err = -EADDRNOTAVAIL */ 400 401 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 402 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 403 leavegroup = 1; 404 goto done; 405 } 406 407 /* update the interface filter */ 408 ip6_mc_del_src(idev, group, omode, 1, source, 1); 409 410 for (j=i+1; j<psl->sl_count; j++) 411 psl->sl_addr[j-1] = psl->sl_addr[j]; 412 psl->sl_count--; 413 err = 0; 414 goto done; 415 } 416 /* else, add a new source to the filter */ 417 418 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 419 err = -ENOBUFS; 420 goto done; 421 } 422 if (!psl || psl->sl_count == psl->sl_max) { 423 struct ip6_sf_socklist *newpsl; 424 int count = IP6_SFBLOCK; 425 426 if (psl) 427 count += psl->sl_max; 428 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 429 if (!newpsl) { 430 err = -ENOBUFS; 431 goto done; 432 } 433 newpsl->sl_max = count; 434 newpsl->sl_count = count - IP6_SFBLOCK; 435 if (psl) { 436 for (i=0; i<psl->sl_count; i++) 437 newpsl->sl_addr[i] = psl->sl_addr[i]; 438 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 439 } 440 pmc->sflist = psl = newpsl; 441 } 442 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 443 for (i=0; i<psl->sl_count; i++) { 444 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 445 if (rv == 0) /* There is an error in the address. */ 446 goto done; 447 } 448 for (j=psl->sl_count-1; j>=i; j--) 449 psl->sl_addr[j+1] = psl->sl_addr[j]; 450 psl->sl_addr[i] = *source; 451 psl->sl_count++; 452 err = 0; 453 /* update the interface list */ 454 ip6_mc_add_src(idev, group, omode, 1, source, 1); 455 done: 456 if (pmclocked) 457 write_unlock(&pmc->sflock); 458 read_unlock_bh(&idev->lock); 459 rcu_read_unlock(); 460 if (leavegroup) 461 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 462 return err; 463 } 464 465 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 466 { 467 const struct in6_addr *group; 468 struct ipv6_mc_socklist *pmc; 469 struct inet6_dev *idev; 470 struct ipv6_pinfo *inet6 = inet6_sk(sk); 471 struct ip6_sf_socklist *newpsl, *psl; 472 struct net *net = sock_net(sk); 473 int leavegroup = 0; 474 int i, err; 475 476 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 477 478 if (!ipv6_addr_is_multicast(group)) 479 return -EINVAL; 480 if (gsf->gf_fmode != MCAST_INCLUDE && 481 gsf->gf_fmode != MCAST_EXCLUDE) 482 return -EINVAL; 483 484 rcu_read_lock(); 485 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 486 487 if (!idev) { 488 rcu_read_unlock(); 489 return -ENODEV; 490 } 491 492 err = 0; 493 494 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 495 leavegroup = 1; 496 goto done; 497 } 498 499 for_each_pmc_rcu(inet6, pmc) { 500 if (pmc->ifindex != gsf->gf_interface) 501 continue; 502 if (ipv6_addr_equal(&pmc->addr, group)) 503 break; 504 } 505 if (!pmc) { /* must have a prior join */ 506 err = -EINVAL; 507 goto done; 508 } 509 if (gsf->gf_numsrc) { 510 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 511 GFP_ATOMIC); 512 if (!newpsl) { 513 err = -ENOBUFS; 514 goto done; 515 } 516 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 517 for (i=0; i<newpsl->sl_count; ++i) { 518 struct sockaddr_in6 *psin6; 519 520 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 521 newpsl->sl_addr[i] = psin6->sin6_addr; 522 } 523 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 524 newpsl->sl_count, newpsl->sl_addr, 0); 525 if (err) { 526 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 527 goto done; 528 } 529 } else { 530 newpsl = NULL; 531 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 532 } 533 534 write_lock(&pmc->sflock); 535 psl = pmc->sflist; 536 if (psl) { 537 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 538 psl->sl_count, psl->sl_addr, 0); 539 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 540 } else 541 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 542 pmc->sflist = newpsl; 543 pmc->sfmode = gsf->gf_fmode; 544 write_unlock(&pmc->sflock); 545 err = 0; 546 done: 547 read_unlock_bh(&idev->lock); 548 rcu_read_unlock(); 549 if (leavegroup) 550 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 551 return err; 552 } 553 554 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 555 struct group_filter __user *optval, int __user *optlen) 556 { 557 int err, i, count, copycount; 558 const struct in6_addr *group; 559 struct ipv6_mc_socklist *pmc; 560 struct inet6_dev *idev; 561 struct ipv6_pinfo *inet6 = inet6_sk(sk); 562 struct ip6_sf_socklist *psl; 563 struct net *net = sock_net(sk); 564 565 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 566 567 if (!ipv6_addr_is_multicast(group)) 568 return -EINVAL; 569 570 rcu_read_lock(); 571 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 572 573 if (!idev) { 574 rcu_read_unlock(); 575 return -ENODEV; 576 } 577 578 err = -EADDRNOTAVAIL; 579 /* 580 * changes to the ipv6_mc_list require the socket lock and 581 * a read lock on ip6_sk_mc_lock. We have the socket lock, 582 * so reading the list is safe. 583 */ 584 585 for_each_pmc_rcu(inet6, pmc) { 586 if (pmc->ifindex != gsf->gf_interface) 587 continue; 588 if (ipv6_addr_equal(group, &pmc->addr)) 589 break; 590 } 591 if (!pmc) /* must have a prior join */ 592 goto done; 593 gsf->gf_fmode = pmc->sfmode; 594 psl = pmc->sflist; 595 count = psl ? psl->sl_count : 0; 596 read_unlock_bh(&idev->lock); 597 rcu_read_unlock(); 598 599 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 600 gsf->gf_numsrc = count; 601 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 602 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 603 return -EFAULT; 604 } 605 /* changes to psl require the socket lock, a read lock on 606 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 607 * have the socket lock, so reading here is safe. 608 */ 609 for (i=0; i<copycount; i++) { 610 struct sockaddr_in6 *psin6; 611 struct sockaddr_storage ss; 612 613 psin6 = (struct sockaddr_in6 *)&ss; 614 memset(&ss, 0, sizeof(ss)); 615 psin6->sin6_family = AF_INET6; 616 psin6->sin6_addr = psl->sl_addr[i]; 617 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 618 return -EFAULT; 619 } 620 return 0; 621 done: 622 read_unlock_bh(&idev->lock); 623 rcu_read_unlock(); 624 return err; 625 } 626 627 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 628 const struct in6_addr *src_addr) 629 { 630 struct ipv6_pinfo *np = inet6_sk(sk); 631 struct ipv6_mc_socklist *mc; 632 struct ip6_sf_socklist *psl; 633 bool rv = true; 634 635 rcu_read_lock(); 636 for_each_pmc_rcu(np, mc) { 637 if (ipv6_addr_equal(&mc->addr, mc_addr)) 638 break; 639 } 640 if (!mc) { 641 rcu_read_unlock(); 642 return true; 643 } 644 read_lock(&mc->sflock); 645 psl = mc->sflist; 646 if (!psl) { 647 rv = mc->sfmode == MCAST_EXCLUDE; 648 } else { 649 int i; 650 651 for (i=0; i<psl->sl_count; i++) { 652 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 653 break; 654 } 655 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 656 rv = false; 657 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 658 rv = false; 659 } 660 read_unlock(&mc->sflock); 661 rcu_read_unlock(); 662 663 return rv; 664 } 665 666 static void ma_put(struct ifmcaddr6 *mc) 667 { 668 if (atomic_dec_and_test(&mc->mca_refcnt)) { 669 in6_dev_put(mc->idev); 670 kfree(mc); 671 } 672 } 673 674 static void igmp6_group_added(struct ifmcaddr6 *mc) 675 { 676 struct net_device *dev = mc->idev->dev; 677 char buf[MAX_ADDR_LEN]; 678 679 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 680 IPV6_ADDR_SCOPE_LINKLOCAL) 681 return; 682 683 spin_lock_bh(&mc->mca_lock); 684 if (!(mc->mca_flags&MAF_LOADED)) { 685 mc->mca_flags |= MAF_LOADED; 686 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 687 dev_mc_add(dev, buf); 688 } 689 spin_unlock_bh(&mc->mca_lock); 690 691 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 692 return; 693 694 if (mld_in_v1_mode(mc->idev)) { 695 igmp6_join_group(mc); 696 return; 697 } 698 /* else v2 */ 699 700 mc->mca_crcount = mc->idev->mc_qrv; 701 mld_ifc_event(mc->idev); 702 } 703 704 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 705 { 706 struct net_device *dev = mc->idev->dev; 707 char buf[MAX_ADDR_LEN]; 708 709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 710 IPV6_ADDR_SCOPE_LINKLOCAL) 711 return; 712 713 spin_lock_bh(&mc->mca_lock); 714 if (mc->mca_flags&MAF_LOADED) { 715 mc->mca_flags &= ~MAF_LOADED; 716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 717 dev_mc_del(dev, buf); 718 } 719 720 if (mc->mca_flags & MAF_NOREPORT) 721 goto done; 722 spin_unlock_bh(&mc->mca_lock); 723 724 if (!mc->idev->dead) 725 igmp6_leave_group(mc); 726 727 spin_lock_bh(&mc->mca_lock); 728 if (del_timer(&mc->mca_timer)) 729 atomic_dec(&mc->mca_refcnt); 730 done: 731 ip6_mc_clear_src(mc); 732 spin_unlock_bh(&mc->mca_lock); 733 } 734 735 /* 736 * deleted ifmcaddr6 manipulation 737 */ 738 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 739 { 740 struct ifmcaddr6 *pmc; 741 742 /* this is an "ifmcaddr6" for convenience; only the fields below 743 * are actually used. In particular, the refcnt and users are not 744 * used for management of the delete list. Using the same structure 745 * for deleted items allows change reports to use common code with 746 * non-deleted or query-response MCA's. 747 */ 748 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 749 if (!pmc) 750 return; 751 752 spin_lock_bh(&im->mca_lock); 753 spin_lock_init(&pmc->mca_lock); 754 pmc->idev = im->idev; 755 in6_dev_hold(idev); 756 pmc->mca_addr = im->mca_addr; 757 pmc->mca_crcount = idev->mc_qrv; 758 pmc->mca_sfmode = im->mca_sfmode; 759 if (pmc->mca_sfmode == MCAST_INCLUDE) { 760 struct ip6_sf_list *psf; 761 762 pmc->mca_tomb = im->mca_tomb; 763 pmc->mca_sources = im->mca_sources; 764 im->mca_tomb = im->mca_sources = NULL; 765 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 766 psf->sf_crcount = pmc->mca_crcount; 767 } 768 spin_unlock_bh(&im->mca_lock); 769 770 spin_lock_bh(&idev->mc_lock); 771 pmc->next = idev->mc_tomb; 772 idev->mc_tomb = pmc; 773 spin_unlock_bh(&idev->mc_lock); 774 } 775 776 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca) 777 { 778 struct ifmcaddr6 *pmc, *pmc_prev; 779 struct ip6_sf_list *psf, *psf_next; 780 781 spin_lock_bh(&idev->mc_lock); 782 pmc_prev = NULL; 783 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 784 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 785 break; 786 pmc_prev = pmc; 787 } 788 if (pmc) { 789 if (pmc_prev) 790 pmc_prev->next = pmc->next; 791 else 792 idev->mc_tomb = pmc->next; 793 } 794 spin_unlock_bh(&idev->mc_lock); 795 796 if (pmc) { 797 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 798 psf_next = psf->sf_next; 799 kfree(psf); 800 } 801 in6_dev_put(pmc->idev); 802 kfree(pmc); 803 } 804 } 805 806 static void mld_clear_delrec(struct inet6_dev *idev) 807 { 808 struct ifmcaddr6 *pmc, *nextpmc; 809 810 spin_lock_bh(&idev->mc_lock); 811 pmc = idev->mc_tomb; 812 idev->mc_tomb = NULL; 813 spin_unlock_bh(&idev->mc_lock); 814 815 for (; pmc; pmc = nextpmc) { 816 nextpmc = pmc->next; 817 ip6_mc_clear_src(pmc); 818 in6_dev_put(pmc->idev); 819 kfree(pmc); 820 } 821 822 /* clear dead sources, too */ 823 read_lock_bh(&idev->lock); 824 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 825 struct ip6_sf_list *psf, *psf_next; 826 827 spin_lock_bh(&pmc->mca_lock); 828 psf = pmc->mca_tomb; 829 pmc->mca_tomb = NULL; 830 spin_unlock_bh(&pmc->mca_lock); 831 for (; psf; psf=psf_next) { 832 psf_next = psf->sf_next; 833 kfree(psf); 834 } 835 } 836 read_unlock_bh(&idev->lock); 837 } 838 839 840 /* 841 * device multicast group inc (add if not found) 842 */ 843 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 844 { 845 struct ifmcaddr6 *mc; 846 struct inet6_dev *idev; 847 848 /* we need to take a reference on idev */ 849 idev = in6_dev_get(dev); 850 851 if (idev == NULL) 852 return -EINVAL; 853 854 write_lock_bh(&idev->lock); 855 if (idev->dead) { 856 write_unlock_bh(&idev->lock); 857 in6_dev_put(idev); 858 return -ENODEV; 859 } 860 861 for (mc = idev->mc_list; mc; mc = mc->next) { 862 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 863 mc->mca_users++; 864 write_unlock_bh(&idev->lock); 865 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 866 NULL, 0); 867 in6_dev_put(idev); 868 return 0; 869 } 870 } 871 872 /* 873 * not found: create a new one. 874 */ 875 876 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 877 878 if (mc == NULL) { 879 write_unlock_bh(&idev->lock); 880 in6_dev_put(idev); 881 return -ENOMEM; 882 } 883 884 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 885 886 mc->mca_addr = *addr; 887 mc->idev = idev; /* (reference taken) */ 888 mc->mca_users = 1; 889 /* mca_stamp should be updated upon changes */ 890 mc->mca_cstamp = mc->mca_tstamp = jiffies; 891 atomic_set(&mc->mca_refcnt, 2); 892 spin_lock_init(&mc->mca_lock); 893 894 /* initial mode is (EX, empty) */ 895 mc->mca_sfmode = MCAST_EXCLUDE; 896 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 897 898 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 899 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 900 mc->mca_flags |= MAF_NOREPORT; 901 902 mc->next = idev->mc_list; 903 idev->mc_list = mc; 904 write_unlock_bh(&idev->lock); 905 906 mld_del_delrec(idev, &mc->mca_addr); 907 igmp6_group_added(mc); 908 ma_put(mc); 909 return 0; 910 } 911 912 /* 913 * device multicast group del 914 */ 915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 916 { 917 struct ifmcaddr6 *ma, **map; 918 919 write_lock_bh(&idev->lock); 920 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 921 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 922 if (--ma->mca_users == 0) { 923 *map = ma->next; 924 write_unlock_bh(&idev->lock); 925 926 igmp6_group_dropped(ma); 927 928 ma_put(ma); 929 return 0; 930 } 931 write_unlock_bh(&idev->lock); 932 return 0; 933 } 934 } 935 write_unlock_bh(&idev->lock); 936 937 return -ENOENT; 938 } 939 940 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 941 { 942 struct inet6_dev *idev; 943 int err; 944 945 rcu_read_lock(); 946 947 idev = __in6_dev_get(dev); 948 if (!idev) 949 err = -ENODEV; 950 else 951 err = __ipv6_dev_mc_dec(idev, addr); 952 953 rcu_read_unlock(); 954 return err; 955 } 956 957 /* 958 * check if the interface/address pair is valid 959 */ 960 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 961 const struct in6_addr *src_addr) 962 { 963 struct inet6_dev *idev; 964 struct ifmcaddr6 *mc; 965 bool rv = false; 966 967 rcu_read_lock(); 968 idev = __in6_dev_get(dev); 969 if (idev) { 970 read_lock_bh(&idev->lock); 971 for (mc = idev->mc_list; mc; mc=mc->next) { 972 if (ipv6_addr_equal(&mc->mca_addr, group)) 973 break; 974 } 975 if (mc) { 976 if (src_addr && !ipv6_addr_any(src_addr)) { 977 struct ip6_sf_list *psf; 978 979 spin_lock_bh(&mc->mca_lock); 980 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 981 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 982 break; 983 } 984 if (psf) 985 rv = psf->sf_count[MCAST_INCLUDE] || 986 psf->sf_count[MCAST_EXCLUDE] != 987 mc->mca_sfcount[MCAST_EXCLUDE]; 988 else 989 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 990 spin_unlock_bh(&mc->mca_lock); 991 } else 992 rv = true; /* don't filter unspecified source */ 993 } 994 read_unlock_bh(&idev->lock); 995 } 996 rcu_read_unlock(); 997 return rv; 998 } 999 1000 static void mld_gq_start_timer(struct inet6_dev *idev) 1001 { 1002 unsigned long tv = net_random() % idev->mc_maxdelay; 1003 1004 idev->mc_gq_running = 1; 1005 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1006 in6_dev_hold(idev); 1007 } 1008 1009 static void mld_gq_stop_timer(struct inet6_dev *idev) 1010 { 1011 idev->mc_gq_running = 0; 1012 if (del_timer(&idev->mc_gq_timer)) 1013 __in6_dev_put(idev); 1014 } 1015 1016 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) 1017 { 1018 unsigned long tv = net_random() % delay; 1019 1020 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1021 in6_dev_hold(idev); 1022 } 1023 1024 static void mld_ifc_stop_timer(struct inet6_dev *idev) 1025 { 1026 idev->mc_ifc_count = 0; 1027 if (del_timer(&idev->mc_ifc_timer)) 1028 __in6_dev_put(idev); 1029 } 1030 1031 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) 1032 { 1033 unsigned long tv = net_random() % delay; 1034 1035 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) 1036 in6_dev_hold(idev); 1037 } 1038 1039 static void mld_dad_stop_timer(struct inet6_dev *idev) 1040 { 1041 if (del_timer(&idev->mc_dad_timer)) 1042 __in6_dev_put(idev); 1043 } 1044 1045 /* 1046 * IGMP handling (alias multicast ICMPv6 messages) 1047 */ 1048 1049 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1050 { 1051 unsigned long delay = resptime; 1052 1053 /* Do not start timer for these addresses */ 1054 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1055 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1056 return; 1057 1058 if (del_timer(&ma->mca_timer)) { 1059 atomic_dec(&ma->mca_refcnt); 1060 delay = ma->mca_timer.expires - jiffies; 1061 } 1062 1063 if (delay >= resptime) 1064 delay = net_random() % resptime; 1065 1066 ma->mca_timer.expires = jiffies + delay; 1067 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1068 atomic_inc(&ma->mca_refcnt); 1069 ma->mca_flags |= MAF_TIMER_RUNNING; 1070 } 1071 1072 /* mark EXCLUDE-mode sources */ 1073 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1074 const struct in6_addr *srcs) 1075 { 1076 struct ip6_sf_list *psf; 1077 int i, scount; 1078 1079 scount = 0; 1080 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1081 if (scount == nsrcs) 1082 break; 1083 for (i=0; i<nsrcs; i++) { 1084 /* skip inactive filters */ 1085 if (psf->sf_count[MCAST_INCLUDE] || 1086 pmc->mca_sfcount[MCAST_EXCLUDE] != 1087 psf->sf_count[MCAST_EXCLUDE]) 1088 break; 1089 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1090 scount++; 1091 break; 1092 } 1093 } 1094 } 1095 pmc->mca_flags &= ~MAF_GSQUERY; 1096 if (scount == nsrcs) /* all sources excluded */ 1097 return false; 1098 return true; 1099 } 1100 1101 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1102 const struct in6_addr *srcs) 1103 { 1104 struct ip6_sf_list *psf; 1105 int i, scount; 1106 1107 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1108 return mld_xmarksources(pmc, nsrcs, srcs); 1109 1110 /* mark INCLUDE-mode sources */ 1111 1112 scount = 0; 1113 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1114 if (scount == nsrcs) 1115 break; 1116 for (i=0; i<nsrcs; i++) { 1117 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1118 psf->sf_gsresp = 1; 1119 scount++; 1120 break; 1121 } 1122 } 1123 } 1124 if (!scount) { 1125 pmc->mca_flags &= ~MAF_GSQUERY; 1126 return false; 1127 } 1128 pmc->mca_flags |= MAF_GSQUERY; 1129 return true; 1130 } 1131 1132 static int mld_force_mld_version(const struct inet6_dev *idev) 1133 { 1134 /* Normally, both are 0 here. If enforcement to a particular is 1135 * being used, individual device enforcement will have a lower 1136 * precedence over 'all' device (.../conf/all/force_mld_version). 1137 */ 1138 1139 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1140 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1141 else 1142 return idev->cnf.force_mld_version; 1143 } 1144 1145 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1146 { 1147 return mld_force_mld_version(idev) == 2; 1148 } 1149 1150 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1151 { 1152 return mld_force_mld_version(idev) == 1; 1153 } 1154 1155 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1156 { 1157 if (mld_in_v2_mode_only(idev)) 1158 return false; 1159 if (mld_in_v1_mode_only(idev)) 1160 return true; 1161 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1162 return true; 1163 1164 return false; 1165 } 1166 1167 static void mld_set_v1_mode(struct inet6_dev *idev) 1168 { 1169 /* RFC3810, relevant sections: 1170 * - 9.1. Robustness Variable 1171 * - 9.2. Query Interval 1172 * - 9.3. Query Response Interval 1173 * - 9.12. Older Version Querier Present Timeout 1174 */ 1175 unsigned long switchback; 1176 1177 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1178 1179 idev->mc_v1_seen = jiffies + switchback; 1180 } 1181 1182 static void mld_update_qrv(struct inet6_dev *idev, 1183 const struct mld2_query *mlh2) 1184 { 1185 /* RFC3810, relevant sections: 1186 * - 5.1.8. QRV (Querier's Robustness Variable) 1187 * - 9.1. Robustness Variable 1188 */ 1189 1190 /* The value of the Robustness Variable MUST NOT be zero, 1191 * and SHOULD NOT be one. Catch this here if we ever run 1192 * into such a case in future. 1193 */ 1194 WARN_ON(idev->mc_qrv == 0); 1195 1196 if (mlh2->mld2q_qrv > 0) 1197 idev->mc_qrv = mlh2->mld2q_qrv; 1198 1199 if (unlikely(idev->mc_qrv < 2)) { 1200 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1201 idev->mc_qrv, MLD_QRV_DEFAULT); 1202 idev->mc_qrv = MLD_QRV_DEFAULT; 1203 } 1204 } 1205 1206 static void mld_update_qi(struct inet6_dev *idev, 1207 const struct mld2_query *mlh2) 1208 { 1209 /* RFC3810, relevant sections: 1210 * - 5.1.9. QQIC (Querier's Query Interval Code) 1211 * - 9.2. Query Interval 1212 * - 9.12. Older Version Querier Present Timeout 1213 * (the [Query Interval] in the last Query received) 1214 */ 1215 unsigned long mc_qqi; 1216 1217 if (mlh2->mld2q_qqic < 128) { 1218 mc_qqi = mlh2->mld2q_qqic; 1219 } else { 1220 unsigned long mc_man, mc_exp; 1221 1222 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1223 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1224 1225 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1226 } 1227 1228 idev->mc_qi = mc_qqi * HZ; 1229 } 1230 1231 static void mld_update_qri(struct inet6_dev *idev, 1232 const struct mld2_query *mlh2) 1233 { 1234 /* RFC3810, relevant sections: 1235 * - 5.1.3. Maximum Response Code 1236 * - 9.3. Query Response Interval 1237 */ 1238 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1239 } 1240 1241 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1242 unsigned long *max_delay) 1243 { 1244 unsigned long mldv1_md; 1245 1246 /* Ignore v1 queries */ 1247 if (mld_in_v2_mode_only(idev)) 1248 return -EINVAL; 1249 1250 /* MLDv1 router present */ 1251 mldv1_md = ntohs(mld->mld_maxdelay); 1252 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1253 1254 mld_set_v1_mode(idev); 1255 1256 /* cancel MLDv2 report timer */ 1257 mld_gq_stop_timer(idev); 1258 /* cancel the interface change timer */ 1259 mld_ifc_stop_timer(idev); 1260 /* clear deleted report items */ 1261 mld_clear_delrec(idev); 1262 1263 return 0; 1264 } 1265 1266 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1267 unsigned long *max_delay) 1268 { 1269 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */ 1270 if (mld_in_v1_mode(idev)) 1271 return -EINVAL; 1272 1273 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1274 1275 mld_update_qrv(idev, mld); 1276 mld_update_qi(idev, mld); 1277 mld_update_qri(idev, mld); 1278 1279 idev->mc_maxdelay = *max_delay; 1280 1281 return 0; 1282 } 1283 1284 /* called with rcu_read_lock() */ 1285 int igmp6_event_query(struct sk_buff *skb) 1286 { 1287 struct mld2_query *mlh2 = NULL; 1288 struct ifmcaddr6 *ma; 1289 const struct in6_addr *group; 1290 unsigned long max_delay; 1291 struct inet6_dev *idev; 1292 struct mld_msg *mld; 1293 int group_type; 1294 int mark = 0; 1295 int len, err; 1296 1297 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1298 return -EINVAL; 1299 1300 /* compute payload length excluding extension headers */ 1301 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1302 len -= skb_network_header_len(skb); 1303 1304 /* Drop queries with not link local source */ 1305 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1306 return -EINVAL; 1307 1308 idev = __in6_dev_get(skb->dev); 1309 if (idev == NULL) 1310 return 0; 1311 1312 mld = (struct mld_msg *)icmp6_hdr(skb); 1313 group = &mld->mld_mca; 1314 group_type = ipv6_addr_type(group); 1315 1316 if (group_type != IPV6_ADDR_ANY && 1317 !(group_type&IPV6_ADDR_MULTICAST)) 1318 return -EINVAL; 1319 1320 if (len == MLD_V1_QUERY_LEN) { 1321 err = mld_process_v1(idev, mld, &max_delay); 1322 if (err < 0) 1323 return err; 1324 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1325 int srcs_offset = sizeof(struct mld2_query) - 1326 sizeof(struct icmp6hdr); 1327 1328 if (!pskb_may_pull(skb, srcs_offset)) 1329 return -EINVAL; 1330 1331 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1332 1333 err = mld_process_v2(idev, mlh2, &max_delay); 1334 if (err < 0) 1335 return err; 1336 1337 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1338 if (mlh2->mld2q_nsrcs) 1339 return -EINVAL; /* no sources allowed */ 1340 1341 mld_gq_start_timer(idev); 1342 return 0; 1343 } 1344 /* mark sources to include, if group & source-specific */ 1345 if (mlh2->mld2q_nsrcs != 0) { 1346 if (!pskb_may_pull(skb, srcs_offset + 1347 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1348 return -EINVAL; 1349 1350 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1351 mark = 1; 1352 } 1353 } else 1354 return -EINVAL; 1355 1356 read_lock_bh(&idev->lock); 1357 if (group_type == IPV6_ADDR_ANY) { 1358 for (ma = idev->mc_list; ma; ma=ma->next) { 1359 spin_lock_bh(&ma->mca_lock); 1360 igmp6_group_queried(ma, max_delay); 1361 spin_unlock_bh(&ma->mca_lock); 1362 } 1363 } else { 1364 for (ma = idev->mc_list; ma; ma=ma->next) { 1365 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1366 continue; 1367 spin_lock_bh(&ma->mca_lock); 1368 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1369 /* gsquery <- gsquery && mark */ 1370 if (!mark) 1371 ma->mca_flags &= ~MAF_GSQUERY; 1372 } else { 1373 /* gsquery <- mark */ 1374 if (mark) 1375 ma->mca_flags |= MAF_GSQUERY; 1376 else 1377 ma->mca_flags &= ~MAF_GSQUERY; 1378 } 1379 if (!(ma->mca_flags & MAF_GSQUERY) || 1380 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1381 igmp6_group_queried(ma, max_delay); 1382 spin_unlock_bh(&ma->mca_lock); 1383 break; 1384 } 1385 } 1386 read_unlock_bh(&idev->lock); 1387 1388 return 0; 1389 } 1390 1391 /* called with rcu_read_lock() */ 1392 int igmp6_event_report(struct sk_buff *skb) 1393 { 1394 struct ifmcaddr6 *ma; 1395 struct inet6_dev *idev; 1396 struct mld_msg *mld; 1397 int addr_type; 1398 1399 /* Our own report looped back. Ignore it. */ 1400 if (skb->pkt_type == PACKET_LOOPBACK) 1401 return 0; 1402 1403 /* send our report if the MC router may not have heard this report */ 1404 if (skb->pkt_type != PACKET_MULTICAST && 1405 skb->pkt_type != PACKET_BROADCAST) 1406 return 0; 1407 1408 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1409 return -EINVAL; 1410 1411 mld = (struct mld_msg *)icmp6_hdr(skb); 1412 1413 /* Drop reports with not link local source */ 1414 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1415 if (addr_type != IPV6_ADDR_ANY && 1416 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1417 return -EINVAL; 1418 1419 idev = __in6_dev_get(skb->dev); 1420 if (idev == NULL) 1421 return -ENODEV; 1422 1423 /* 1424 * Cancel the timer for this group 1425 */ 1426 1427 read_lock_bh(&idev->lock); 1428 for (ma = idev->mc_list; ma; ma=ma->next) { 1429 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1430 spin_lock(&ma->mca_lock); 1431 if (del_timer(&ma->mca_timer)) 1432 atomic_dec(&ma->mca_refcnt); 1433 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1434 spin_unlock(&ma->mca_lock); 1435 break; 1436 } 1437 } 1438 read_unlock_bh(&idev->lock); 1439 return 0; 1440 } 1441 1442 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1443 int gdeleted, int sdeleted) 1444 { 1445 switch (type) { 1446 case MLD2_MODE_IS_INCLUDE: 1447 case MLD2_MODE_IS_EXCLUDE: 1448 if (gdeleted || sdeleted) 1449 return false; 1450 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1451 if (pmc->mca_sfmode == MCAST_INCLUDE) 1452 return true; 1453 /* don't include if this source is excluded 1454 * in all filters 1455 */ 1456 if (psf->sf_count[MCAST_INCLUDE]) 1457 return type == MLD2_MODE_IS_INCLUDE; 1458 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1459 psf->sf_count[MCAST_EXCLUDE]; 1460 } 1461 return false; 1462 case MLD2_CHANGE_TO_INCLUDE: 1463 if (gdeleted || sdeleted) 1464 return false; 1465 return psf->sf_count[MCAST_INCLUDE] != 0; 1466 case MLD2_CHANGE_TO_EXCLUDE: 1467 if (gdeleted || sdeleted) 1468 return false; 1469 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1470 psf->sf_count[MCAST_INCLUDE]) 1471 return false; 1472 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1473 psf->sf_count[MCAST_EXCLUDE]; 1474 case MLD2_ALLOW_NEW_SOURCES: 1475 if (gdeleted || !psf->sf_crcount) 1476 return false; 1477 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1478 case MLD2_BLOCK_OLD_SOURCES: 1479 if (pmc->mca_sfmode == MCAST_INCLUDE) 1480 return gdeleted || (psf->sf_crcount && sdeleted); 1481 return psf->sf_crcount && !gdeleted && !sdeleted; 1482 } 1483 return false; 1484 } 1485 1486 static int 1487 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1488 { 1489 struct ip6_sf_list *psf; 1490 int scount = 0; 1491 1492 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1493 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1494 continue; 1495 scount++; 1496 } 1497 return scount; 1498 } 1499 1500 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1501 struct net_device *dev, 1502 const struct in6_addr *saddr, 1503 const struct in6_addr *daddr, 1504 int proto, int len) 1505 { 1506 struct ipv6hdr *hdr; 1507 1508 skb->protocol = htons(ETH_P_IPV6); 1509 skb->dev = dev; 1510 1511 skb_reset_network_header(skb); 1512 skb_put(skb, sizeof(struct ipv6hdr)); 1513 hdr = ipv6_hdr(skb); 1514 1515 ip6_flow_hdr(hdr, 0, 0); 1516 1517 hdr->payload_len = htons(len); 1518 hdr->nexthdr = proto; 1519 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1520 1521 hdr->saddr = *saddr; 1522 hdr->daddr = *daddr; 1523 } 1524 1525 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size) 1526 { 1527 struct net_device *dev = idev->dev; 1528 struct net *net = dev_net(dev); 1529 struct sock *sk = net->ipv6.igmp_sk; 1530 struct sk_buff *skb; 1531 struct mld2_report *pmr; 1532 struct in6_addr addr_buf; 1533 const struct in6_addr *saddr; 1534 int hlen = LL_RESERVED_SPACE(dev); 1535 int tlen = dev->needed_tailroom; 1536 int err; 1537 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1538 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1539 IPV6_TLV_PADN, 0 }; 1540 1541 /* we assume size > sizeof(ra) here */ 1542 size += hlen + tlen; 1543 /* limit our allocations to order-0 page */ 1544 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1545 skb = sock_alloc_send_skb(sk, size, 1, &err); 1546 1547 if (!skb) 1548 return NULL; 1549 1550 skb->priority = TC_PRIO_CONTROL; 1551 skb_reserve(skb, hlen); 1552 1553 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1554 /* <draft-ietf-magma-mld-source-05.txt>: 1555 * use unspecified address as the source address 1556 * when a valid link-local address is not available. 1557 */ 1558 saddr = &in6addr_any; 1559 } else 1560 saddr = &addr_buf; 1561 1562 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1563 1564 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1565 1566 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1567 skb_put(skb, sizeof(*pmr)); 1568 pmr = (struct mld2_report *)skb_transport_header(skb); 1569 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1570 pmr->mld2r_resv1 = 0; 1571 pmr->mld2r_cksum = 0; 1572 pmr->mld2r_resv2 = 0; 1573 pmr->mld2r_ngrec = 0; 1574 return skb; 1575 } 1576 1577 static void mld_sendpack(struct sk_buff *skb) 1578 { 1579 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1580 struct mld2_report *pmr = 1581 (struct mld2_report *)skb_transport_header(skb); 1582 int payload_len, mldlen; 1583 struct inet6_dev *idev; 1584 struct net *net = dev_net(skb->dev); 1585 int err; 1586 struct flowi6 fl6; 1587 struct dst_entry *dst; 1588 1589 rcu_read_lock(); 1590 idev = __in6_dev_get(skb->dev); 1591 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1592 1593 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1594 sizeof(*pip6); 1595 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1596 pip6->payload_len = htons(payload_len); 1597 1598 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1599 IPPROTO_ICMPV6, 1600 csum_partial(skb_transport_header(skb), 1601 mldlen, 0)); 1602 1603 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1604 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1605 skb->dev->ifindex); 1606 dst = icmp6_dst_alloc(skb->dev, &fl6); 1607 1608 err = 0; 1609 if (IS_ERR(dst)) { 1610 err = PTR_ERR(dst); 1611 dst = NULL; 1612 } 1613 skb_dst_set(skb, dst); 1614 if (err) 1615 goto err_out; 1616 1617 payload_len = skb->len; 1618 1619 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1620 dst_output); 1621 out: 1622 if (!err) { 1623 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1624 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1625 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1626 } else 1627 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1628 1629 rcu_read_unlock(); 1630 return; 1631 1632 err_out: 1633 kfree_skb(skb); 1634 goto out; 1635 } 1636 1637 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1638 { 1639 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1640 } 1641 1642 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1643 int type, struct mld2_grec **ppgr) 1644 { 1645 struct net_device *dev = pmc->idev->dev; 1646 struct mld2_report *pmr; 1647 struct mld2_grec *pgr; 1648 1649 if (!skb) 1650 skb = mld_newpack(pmc->idev, dev->mtu); 1651 if (!skb) 1652 return NULL; 1653 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1654 pgr->grec_type = type; 1655 pgr->grec_auxwords = 0; 1656 pgr->grec_nsrcs = 0; 1657 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1658 pmr = (struct mld2_report *)skb_transport_header(skb); 1659 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1660 *ppgr = pgr; 1661 return skb; 1662 } 1663 1664 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1665 skb_tailroom(skb)) : 0) 1666 1667 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1668 int type, int gdeleted, int sdeleted) 1669 { 1670 struct inet6_dev *idev = pmc->idev; 1671 struct net_device *dev = idev->dev; 1672 struct mld2_report *pmr; 1673 struct mld2_grec *pgr = NULL; 1674 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1675 int scount, stotal, first, isquery, truncate; 1676 1677 if (pmc->mca_flags & MAF_NOREPORT) 1678 return skb; 1679 1680 isquery = type == MLD2_MODE_IS_INCLUDE || 1681 type == MLD2_MODE_IS_EXCLUDE; 1682 truncate = type == MLD2_MODE_IS_EXCLUDE || 1683 type == MLD2_CHANGE_TO_EXCLUDE; 1684 1685 stotal = scount = 0; 1686 1687 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1688 1689 if (!*psf_list) 1690 goto empty_source; 1691 1692 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1693 1694 /* EX and TO_EX get a fresh packet, if needed */ 1695 if (truncate) { 1696 if (pmr && pmr->mld2r_ngrec && 1697 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1698 if (skb) 1699 mld_sendpack(skb); 1700 skb = mld_newpack(idev, dev->mtu); 1701 } 1702 } 1703 first = 1; 1704 psf_prev = NULL; 1705 for (psf=*psf_list; psf; psf=psf_next) { 1706 struct in6_addr *psrc; 1707 1708 psf_next = psf->sf_next; 1709 1710 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1711 psf_prev = psf; 1712 continue; 1713 } 1714 1715 /* clear marks on query responses */ 1716 if (isquery) 1717 psf->sf_gsresp = 0; 1718 1719 if (AVAILABLE(skb) < sizeof(*psrc) + 1720 first*sizeof(struct mld2_grec)) { 1721 if (truncate && !first) 1722 break; /* truncate these */ 1723 if (pgr) 1724 pgr->grec_nsrcs = htons(scount); 1725 if (skb) 1726 mld_sendpack(skb); 1727 skb = mld_newpack(idev, dev->mtu); 1728 first = 1; 1729 scount = 0; 1730 } 1731 if (first) { 1732 skb = add_grhead(skb, pmc, type, &pgr); 1733 first = 0; 1734 } 1735 if (!skb) 1736 return NULL; 1737 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1738 *psrc = psf->sf_addr; 1739 scount++; stotal++; 1740 if ((type == MLD2_ALLOW_NEW_SOURCES || 1741 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1742 psf->sf_crcount--; 1743 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1744 if (psf_prev) 1745 psf_prev->sf_next = psf->sf_next; 1746 else 1747 *psf_list = psf->sf_next; 1748 kfree(psf); 1749 continue; 1750 } 1751 } 1752 psf_prev = psf; 1753 } 1754 1755 empty_source: 1756 if (!stotal) { 1757 if (type == MLD2_ALLOW_NEW_SOURCES || 1758 type == MLD2_BLOCK_OLD_SOURCES) 1759 return skb; 1760 if (pmc->mca_crcount || isquery) { 1761 /* make sure we have room for group header */ 1762 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1763 mld_sendpack(skb); 1764 skb = NULL; /* add_grhead will get a new one */ 1765 } 1766 skb = add_grhead(skb, pmc, type, &pgr); 1767 } 1768 } 1769 if (pgr) 1770 pgr->grec_nsrcs = htons(scount); 1771 1772 if (isquery) 1773 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1774 return skb; 1775 } 1776 1777 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1778 { 1779 struct sk_buff *skb = NULL; 1780 int type; 1781 1782 read_lock_bh(&idev->lock); 1783 if (!pmc) { 1784 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1785 if (pmc->mca_flags & MAF_NOREPORT) 1786 continue; 1787 spin_lock_bh(&pmc->mca_lock); 1788 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1789 type = MLD2_MODE_IS_EXCLUDE; 1790 else 1791 type = MLD2_MODE_IS_INCLUDE; 1792 skb = add_grec(skb, pmc, type, 0, 0); 1793 spin_unlock_bh(&pmc->mca_lock); 1794 } 1795 } else { 1796 spin_lock_bh(&pmc->mca_lock); 1797 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1798 type = MLD2_MODE_IS_EXCLUDE; 1799 else 1800 type = MLD2_MODE_IS_INCLUDE; 1801 skb = add_grec(skb, pmc, type, 0, 0); 1802 spin_unlock_bh(&pmc->mca_lock); 1803 } 1804 read_unlock_bh(&idev->lock); 1805 if (skb) 1806 mld_sendpack(skb); 1807 } 1808 1809 /* 1810 * remove zero-count source records from a source filter list 1811 */ 1812 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1813 { 1814 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1815 1816 psf_prev = NULL; 1817 for (psf=*ppsf; psf; psf = psf_next) { 1818 psf_next = psf->sf_next; 1819 if (psf->sf_crcount == 0) { 1820 if (psf_prev) 1821 psf_prev->sf_next = psf->sf_next; 1822 else 1823 *ppsf = psf->sf_next; 1824 kfree(psf); 1825 } else 1826 psf_prev = psf; 1827 } 1828 } 1829 1830 static void mld_send_cr(struct inet6_dev *idev) 1831 { 1832 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1833 struct sk_buff *skb = NULL; 1834 int type, dtype; 1835 1836 read_lock_bh(&idev->lock); 1837 spin_lock(&idev->mc_lock); 1838 1839 /* deleted MCA's */ 1840 pmc_prev = NULL; 1841 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1842 pmc_next = pmc->next; 1843 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1844 type = MLD2_BLOCK_OLD_SOURCES; 1845 dtype = MLD2_BLOCK_OLD_SOURCES; 1846 skb = add_grec(skb, pmc, type, 1, 0); 1847 skb = add_grec(skb, pmc, dtype, 1, 1); 1848 } 1849 if (pmc->mca_crcount) { 1850 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1851 type = MLD2_CHANGE_TO_INCLUDE; 1852 skb = add_grec(skb, pmc, type, 1, 0); 1853 } 1854 pmc->mca_crcount--; 1855 if (pmc->mca_crcount == 0) { 1856 mld_clear_zeros(&pmc->mca_tomb); 1857 mld_clear_zeros(&pmc->mca_sources); 1858 } 1859 } 1860 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1861 !pmc->mca_sources) { 1862 if (pmc_prev) 1863 pmc_prev->next = pmc_next; 1864 else 1865 idev->mc_tomb = pmc_next; 1866 in6_dev_put(pmc->idev); 1867 kfree(pmc); 1868 } else 1869 pmc_prev = pmc; 1870 } 1871 spin_unlock(&idev->mc_lock); 1872 1873 /* change recs */ 1874 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1875 spin_lock_bh(&pmc->mca_lock); 1876 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1877 type = MLD2_BLOCK_OLD_SOURCES; 1878 dtype = MLD2_ALLOW_NEW_SOURCES; 1879 } else { 1880 type = MLD2_ALLOW_NEW_SOURCES; 1881 dtype = MLD2_BLOCK_OLD_SOURCES; 1882 } 1883 skb = add_grec(skb, pmc, type, 0, 0); 1884 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1885 1886 /* filter mode changes */ 1887 if (pmc->mca_crcount) { 1888 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1889 type = MLD2_CHANGE_TO_EXCLUDE; 1890 else 1891 type = MLD2_CHANGE_TO_INCLUDE; 1892 skb = add_grec(skb, pmc, type, 0, 0); 1893 pmc->mca_crcount--; 1894 } 1895 spin_unlock_bh(&pmc->mca_lock); 1896 } 1897 read_unlock_bh(&idev->lock); 1898 if (!skb) 1899 return; 1900 (void) mld_sendpack(skb); 1901 } 1902 1903 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1904 { 1905 struct net *net = dev_net(dev); 1906 struct sock *sk = net->ipv6.igmp_sk; 1907 struct inet6_dev *idev; 1908 struct sk_buff *skb; 1909 struct mld_msg *hdr; 1910 const struct in6_addr *snd_addr, *saddr; 1911 struct in6_addr addr_buf; 1912 int hlen = LL_RESERVED_SPACE(dev); 1913 int tlen = dev->needed_tailroom; 1914 int err, len, payload_len, full_len; 1915 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1916 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1917 IPV6_TLV_PADN, 0 }; 1918 struct flowi6 fl6; 1919 struct dst_entry *dst; 1920 1921 if (type == ICMPV6_MGM_REDUCTION) 1922 snd_addr = &in6addr_linklocal_allrouters; 1923 else 1924 snd_addr = addr; 1925 1926 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1927 payload_len = len + sizeof(ra); 1928 full_len = sizeof(struct ipv6hdr) + payload_len; 1929 1930 rcu_read_lock(); 1931 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1932 IPSTATS_MIB_OUT, full_len); 1933 rcu_read_unlock(); 1934 1935 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1936 1937 if (skb == NULL) { 1938 rcu_read_lock(); 1939 IP6_INC_STATS(net, __in6_dev_get(dev), 1940 IPSTATS_MIB_OUTDISCARDS); 1941 rcu_read_unlock(); 1942 return; 1943 } 1944 skb->priority = TC_PRIO_CONTROL; 1945 skb_reserve(skb, hlen); 1946 1947 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1948 /* <draft-ietf-magma-mld-source-05.txt>: 1949 * use unspecified address as the source address 1950 * when a valid link-local address is not available. 1951 */ 1952 saddr = &in6addr_any; 1953 } else 1954 saddr = &addr_buf; 1955 1956 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1957 1958 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1959 1960 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1961 memset(hdr, 0, sizeof(struct mld_msg)); 1962 hdr->mld_type = type; 1963 hdr->mld_mca = *addr; 1964 1965 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1966 IPPROTO_ICMPV6, 1967 csum_partial(hdr, len, 0)); 1968 1969 rcu_read_lock(); 1970 idev = __in6_dev_get(skb->dev); 1971 1972 icmpv6_flow_init(sk, &fl6, type, 1973 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1974 skb->dev->ifindex); 1975 dst = icmp6_dst_alloc(skb->dev, &fl6); 1976 if (IS_ERR(dst)) { 1977 err = PTR_ERR(dst); 1978 goto err_out; 1979 } 1980 1981 skb_dst_set(skb, dst); 1982 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1983 dst_output); 1984 out: 1985 if (!err) { 1986 ICMP6MSGOUT_INC_STATS(net, idev, type); 1987 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1988 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1989 } else 1990 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1991 1992 rcu_read_unlock(); 1993 return; 1994 1995 err_out: 1996 kfree_skb(skb); 1997 goto out; 1998 } 1999 2000 static void mld_resend_report(struct inet6_dev *idev) 2001 { 2002 if (mld_in_v1_mode(idev)) { 2003 struct ifmcaddr6 *mcaddr; 2004 read_lock_bh(&idev->lock); 2005 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) { 2006 if (!(mcaddr->mca_flags & MAF_NOREPORT)) 2007 igmp6_send(&mcaddr->mca_addr, idev->dev, 2008 ICMPV6_MGM_REPORT); 2009 } 2010 read_unlock_bh(&idev->lock); 2011 } else { 2012 mld_send_report(idev, NULL); 2013 } 2014 } 2015 2016 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2017 { 2018 idev->mc_dad_count = idev->mc_qrv; 2019 if (idev->mc_dad_count) { 2020 mld_resend_report(idev); 2021 idev->mc_dad_count--; 2022 if (idev->mc_dad_count) 2023 mld_dad_start_timer(idev, idev->mc_maxdelay); 2024 } 2025 } 2026 2027 static void mld_dad_timer_expire(unsigned long data) 2028 { 2029 struct inet6_dev *idev = (struct inet6_dev *)data; 2030 2031 mld_resend_report(idev); 2032 if (idev->mc_dad_count) { 2033 idev->mc_dad_count--; 2034 if (idev->mc_dad_count) 2035 mld_dad_start_timer(idev, idev->mc_maxdelay); 2036 } 2037 in6_dev_put(idev); 2038 } 2039 2040 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2041 const struct in6_addr *psfsrc) 2042 { 2043 struct ip6_sf_list *psf, *psf_prev; 2044 int rv = 0; 2045 2046 psf_prev = NULL; 2047 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2048 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2049 break; 2050 psf_prev = psf; 2051 } 2052 if (!psf || psf->sf_count[sfmode] == 0) { 2053 /* source filter not found, or count wrong => bug */ 2054 return -ESRCH; 2055 } 2056 psf->sf_count[sfmode]--; 2057 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2058 struct inet6_dev *idev = pmc->idev; 2059 2060 /* no more filters for this source */ 2061 if (psf_prev) 2062 psf_prev->sf_next = psf->sf_next; 2063 else 2064 pmc->mca_sources = psf->sf_next; 2065 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2066 !mld_in_v1_mode(idev)) { 2067 psf->sf_crcount = idev->mc_qrv; 2068 psf->sf_next = pmc->mca_tomb; 2069 pmc->mca_tomb = psf; 2070 rv = 1; 2071 } else 2072 kfree(psf); 2073 } 2074 return rv; 2075 } 2076 2077 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2078 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2079 int delta) 2080 { 2081 struct ifmcaddr6 *pmc; 2082 int changerec = 0; 2083 int i, err; 2084 2085 if (!idev) 2086 return -ENODEV; 2087 read_lock_bh(&idev->lock); 2088 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2089 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2090 break; 2091 } 2092 if (!pmc) { 2093 /* MCA not found?? bug */ 2094 read_unlock_bh(&idev->lock); 2095 return -ESRCH; 2096 } 2097 spin_lock_bh(&pmc->mca_lock); 2098 sf_markstate(pmc); 2099 if (!delta) { 2100 if (!pmc->mca_sfcount[sfmode]) { 2101 spin_unlock_bh(&pmc->mca_lock); 2102 read_unlock_bh(&idev->lock); 2103 return -EINVAL; 2104 } 2105 pmc->mca_sfcount[sfmode]--; 2106 } 2107 err = 0; 2108 for (i=0; i<sfcount; i++) { 2109 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2110 2111 changerec |= rv > 0; 2112 if (!err && rv < 0) 2113 err = rv; 2114 } 2115 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2116 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2117 pmc->mca_sfcount[MCAST_INCLUDE]) { 2118 struct ip6_sf_list *psf; 2119 2120 /* filter mode change */ 2121 pmc->mca_sfmode = MCAST_INCLUDE; 2122 pmc->mca_crcount = idev->mc_qrv; 2123 idev->mc_ifc_count = pmc->mca_crcount; 2124 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2125 psf->sf_crcount = 0; 2126 mld_ifc_event(pmc->idev); 2127 } else if (sf_setstate(pmc) || changerec) 2128 mld_ifc_event(pmc->idev); 2129 spin_unlock_bh(&pmc->mca_lock); 2130 read_unlock_bh(&idev->lock); 2131 return err; 2132 } 2133 2134 /* 2135 * Add multicast single-source filter to the interface list 2136 */ 2137 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2138 const struct in6_addr *psfsrc) 2139 { 2140 struct ip6_sf_list *psf, *psf_prev; 2141 2142 psf_prev = NULL; 2143 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2144 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2145 break; 2146 psf_prev = psf; 2147 } 2148 if (!psf) { 2149 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 2150 if (!psf) 2151 return -ENOBUFS; 2152 2153 psf->sf_addr = *psfsrc; 2154 if (psf_prev) { 2155 psf_prev->sf_next = psf; 2156 } else 2157 pmc->mca_sources = psf; 2158 } 2159 psf->sf_count[sfmode]++; 2160 return 0; 2161 } 2162 2163 static void sf_markstate(struct ifmcaddr6 *pmc) 2164 { 2165 struct ip6_sf_list *psf; 2166 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2167 2168 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 2169 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2170 psf->sf_oldin = mca_xcount == 2171 psf->sf_count[MCAST_EXCLUDE] && 2172 !psf->sf_count[MCAST_INCLUDE]; 2173 } else 2174 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2175 } 2176 2177 static int sf_setstate(struct ifmcaddr6 *pmc) 2178 { 2179 struct ip6_sf_list *psf, *dpsf; 2180 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2181 int qrv = pmc->idev->mc_qrv; 2182 int new_in, rv; 2183 2184 rv = 0; 2185 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2186 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2187 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2188 !psf->sf_count[MCAST_INCLUDE]; 2189 } else 2190 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2191 if (new_in) { 2192 if (!psf->sf_oldin) { 2193 struct ip6_sf_list *prev = NULL; 2194 2195 for (dpsf=pmc->mca_tomb; dpsf; 2196 dpsf=dpsf->sf_next) { 2197 if (ipv6_addr_equal(&dpsf->sf_addr, 2198 &psf->sf_addr)) 2199 break; 2200 prev = dpsf; 2201 } 2202 if (dpsf) { 2203 if (prev) 2204 prev->sf_next = dpsf->sf_next; 2205 else 2206 pmc->mca_tomb = dpsf->sf_next; 2207 kfree(dpsf); 2208 } 2209 psf->sf_crcount = qrv; 2210 rv++; 2211 } 2212 } else if (psf->sf_oldin) { 2213 psf->sf_crcount = 0; 2214 /* 2215 * add or update "delete" records if an active filter 2216 * is now inactive 2217 */ 2218 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2219 if (ipv6_addr_equal(&dpsf->sf_addr, 2220 &psf->sf_addr)) 2221 break; 2222 if (!dpsf) { 2223 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2224 if (!dpsf) 2225 continue; 2226 *dpsf = *psf; 2227 /* pmc->mca_lock held by callers */ 2228 dpsf->sf_next = pmc->mca_tomb; 2229 pmc->mca_tomb = dpsf; 2230 } 2231 dpsf->sf_crcount = qrv; 2232 rv++; 2233 } 2234 } 2235 return rv; 2236 } 2237 2238 /* 2239 * Add multicast source filter list to the interface list 2240 */ 2241 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2242 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2243 int delta) 2244 { 2245 struct ifmcaddr6 *pmc; 2246 int isexclude; 2247 int i, err; 2248 2249 if (!idev) 2250 return -ENODEV; 2251 read_lock_bh(&idev->lock); 2252 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2253 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2254 break; 2255 } 2256 if (!pmc) { 2257 /* MCA not found?? bug */ 2258 read_unlock_bh(&idev->lock); 2259 return -ESRCH; 2260 } 2261 spin_lock_bh(&pmc->mca_lock); 2262 2263 sf_markstate(pmc); 2264 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2265 if (!delta) 2266 pmc->mca_sfcount[sfmode]++; 2267 err = 0; 2268 for (i=0; i<sfcount; i++) { 2269 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2270 if (err) 2271 break; 2272 } 2273 if (err) { 2274 int j; 2275 2276 if (!delta) 2277 pmc->mca_sfcount[sfmode]--; 2278 for (j=0; j<i; j++) 2279 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2280 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2281 struct ip6_sf_list *psf; 2282 2283 /* filter mode change */ 2284 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2285 pmc->mca_sfmode = MCAST_EXCLUDE; 2286 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2287 pmc->mca_sfmode = MCAST_INCLUDE; 2288 /* else no filters; keep old mode for reports */ 2289 2290 pmc->mca_crcount = idev->mc_qrv; 2291 idev->mc_ifc_count = pmc->mca_crcount; 2292 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2293 psf->sf_crcount = 0; 2294 mld_ifc_event(idev); 2295 } else if (sf_setstate(pmc)) 2296 mld_ifc_event(idev); 2297 spin_unlock_bh(&pmc->mca_lock); 2298 read_unlock_bh(&idev->lock); 2299 return err; 2300 } 2301 2302 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2303 { 2304 struct ip6_sf_list *psf, *nextpsf; 2305 2306 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2307 nextpsf = psf->sf_next; 2308 kfree(psf); 2309 } 2310 pmc->mca_tomb = NULL; 2311 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2312 nextpsf = psf->sf_next; 2313 kfree(psf); 2314 } 2315 pmc->mca_sources = NULL; 2316 pmc->mca_sfmode = MCAST_EXCLUDE; 2317 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2318 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2319 } 2320 2321 2322 static void igmp6_join_group(struct ifmcaddr6 *ma) 2323 { 2324 unsigned long delay; 2325 2326 if (ma->mca_flags & MAF_NOREPORT) 2327 return; 2328 2329 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2330 2331 delay = net_random() % unsolicited_report_interval(ma->idev); 2332 2333 spin_lock_bh(&ma->mca_lock); 2334 if (del_timer(&ma->mca_timer)) { 2335 atomic_dec(&ma->mca_refcnt); 2336 delay = ma->mca_timer.expires - jiffies; 2337 } 2338 2339 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2340 atomic_inc(&ma->mca_refcnt); 2341 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2342 spin_unlock_bh(&ma->mca_lock); 2343 } 2344 2345 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2346 struct inet6_dev *idev) 2347 { 2348 int err; 2349 2350 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2351 * so no other readers or writers of iml or its sflist 2352 */ 2353 if (!iml->sflist) { 2354 /* any-source empty exclude case */ 2355 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2356 } 2357 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2358 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2359 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2360 iml->sflist = NULL; 2361 return err; 2362 } 2363 2364 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2365 { 2366 if (mld_in_v1_mode(ma->idev)) { 2367 if (ma->mca_flags & MAF_LAST_REPORTER) 2368 igmp6_send(&ma->mca_addr, ma->idev->dev, 2369 ICMPV6_MGM_REDUCTION); 2370 } else { 2371 mld_add_delrec(ma->idev, ma); 2372 mld_ifc_event(ma->idev); 2373 } 2374 } 2375 2376 static void mld_gq_timer_expire(unsigned long data) 2377 { 2378 struct inet6_dev *idev = (struct inet6_dev *)data; 2379 2380 idev->mc_gq_running = 0; 2381 mld_send_report(idev, NULL); 2382 in6_dev_put(idev); 2383 } 2384 2385 static void mld_ifc_timer_expire(unsigned long data) 2386 { 2387 struct inet6_dev *idev = (struct inet6_dev *)data; 2388 2389 mld_send_cr(idev); 2390 if (idev->mc_ifc_count) { 2391 idev->mc_ifc_count--; 2392 if (idev->mc_ifc_count) 2393 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2394 } 2395 in6_dev_put(idev); 2396 } 2397 2398 static void mld_ifc_event(struct inet6_dev *idev) 2399 { 2400 if (mld_in_v1_mode(idev)) 2401 return; 2402 idev->mc_ifc_count = idev->mc_qrv; 2403 mld_ifc_start_timer(idev, 1); 2404 } 2405 2406 2407 static void igmp6_timer_handler(unsigned long data) 2408 { 2409 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2410 2411 if (mld_in_v1_mode(ma->idev)) 2412 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2413 else 2414 mld_send_report(ma->idev, ma); 2415 2416 spin_lock(&ma->mca_lock); 2417 ma->mca_flags |= MAF_LAST_REPORTER; 2418 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2419 spin_unlock(&ma->mca_lock); 2420 ma_put(ma); 2421 } 2422 2423 /* Device changing type */ 2424 2425 void ipv6_mc_unmap(struct inet6_dev *idev) 2426 { 2427 struct ifmcaddr6 *i; 2428 2429 /* Install multicast list, except for all-nodes (already installed) */ 2430 2431 read_lock_bh(&idev->lock); 2432 for (i = idev->mc_list; i; i = i->next) 2433 igmp6_group_dropped(i); 2434 read_unlock_bh(&idev->lock); 2435 } 2436 2437 void ipv6_mc_remap(struct inet6_dev *idev) 2438 { 2439 ipv6_mc_up(idev); 2440 } 2441 2442 /* Device going down */ 2443 2444 void ipv6_mc_down(struct inet6_dev *idev) 2445 { 2446 struct ifmcaddr6 *i; 2447 2448 /* Withdraw multicast list */ 2449 2450 read_lock_bh(&idev->lock); 2451 mld_ifc_stop_timer(idev); 2452 mld_gq_stop_timer(idev); 2453 mld_dad_stop_timer(idev); 2454 2455 for (i = idev->mc_list; i; i=i->next) 2456 igmp6_group_dropped(i); 2457 read_unlock_bh(&idev->lock); 2458 2459 mld_clear_delrec(idev); 2460 } 2461 2462 2463 /* Device going up */ 2464 2465 void ipv6_mc_up(struct inet6_dev *idev) 2466 { 2467 struct ifmcaddr6 *i; 2468 2469 /* Install multicast list, except for all-nodes (already installed) */ 2470 2471 read_lock_bh(&idev->lock); 2472 for (i = idev->mc_list; i; i=i->next) 2473 igmp6_group_added(i); 2474 read_unlock_bh(&idev->lock); 2475 } 2476 2477 /* IPv6 device initialization. */ 2478 2479 void ipv6_mc_init_dev(struct inet6_dev *idev) 2480 { 2481 write_lock_bh(&idev->lock); 2482 spin_lock_init(&idev->mc_lock); 2483 idev->mc_gq_running = 0; 2484 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2485 (unsigned long)idev); 2486 idev->mc_tomb = NULL; 2487 idev->mc_ifc_count = 0; 2488 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2489 (unsigned long)idev); 2490 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, 2491 (unsigned long)idev); 2492 2493 idev->mc_qrv = MLD_QRV_DEFAULT; 2494 idev->mc_qi = MLD_QI_DEFAULT; 2495 idev->mc_qri = MLD_QRI_DEFAULT; 2496 2497 idev->mc_maxdelay = unsolicited_report_interval(idev); 2498 idev->mc_v1_seen = 0; 2499 write_unlock_bh(&idev->lock); 2500 } 2501 2502 /* 2503 * Device is about to be destroyed: clean up. 2504 */ 2505 2506 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2507 { 2508 struct ifmcaddr6 *i; 2509 2510 /* Deactivate timers */ 2511 ipv6_mc_down(idev); 2512 2513 /* Delete all-nodes address. */ 2514 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2515 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2516 * fail. 2517 */ 2518 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2519 2520 if (idev->cnf.forwarding) 2521 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2522 2523 write_lock_bh(&idev->lock); 2524 while ((i = idev->mc_list) != NULL) { 2525 idev->mc_list = i->next; 2526 write_unlock_bh(&idev->lock); 2527 2528 igmp6_group_dropped(i); 2529 ma_put(i); 2530 2531 write_lock_bh(&idev->lock); 2532 } 2533 write_unlock_bh(&idev->lock); 2534 } 2535 2536 #ifdef CONFIG_PROC_FS 2537 struct igmp6_mc_iter_state { 2538 struct seq_net_private p; 2539 struct net_device *dev; 2540 struct inet6_dev *idev; 2541 }; 2542 2543 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2544 2545 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2546 { 2547 struct ifmcaddr6 *im = NULL; 2548 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2549 struct net *net = seq_file_net(seq); 2550 2551 state->idev = NULL; 2552 for_each_netdev_rcu(net, state->dev) { 2553 struct inet6_dev *idev; 2554 idev = __in6_dev_get(state->dev); 2555 if (!idev) 2556 continue; 2557 read_lock_bh(&idev->lock); 2558 im = idev->mc_list; 2559 if (im) { 2560 state->idev = idev; 2561 break; 2562 } 2563 read_unlock_bh(&idev->lock); 2564 } 2565 return im; 2566 } 2567 2568 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2569 { 2570 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2571 2572 im = im->next; 2573 while (!im) { 2574 if (likely(state->idev != NULL)) 2575 read_unlock_bh(&state->idev->lock); 2576 2577 state->dev = next_net_device_rcu(state->dev); 2578 if (!state->dev) { 2579 state->idev = NULL; 2580 break; 2581 } 2582 state->idev = __in6_dev_get(state->dev); 2583 if (!state->idev) 2584 continue; 2585 read_lock_bh(&state->idev->lock); 2586 im = state->idev->mc_list; 2587 } 2588 return im; 2589 } 2590 2591 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2592 { 2593 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2594 if (im) 2595 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2596 --pos; 2597 return pos ? NULL : im; 2598 } 2599 2600 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2601 __acquires(RCU) 2602 { 2603 rcu_read_lock(); 2604 return igmp6_mc_get_idx(seq, *pos); 2605 } 2606 2607 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2608 { 2609 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2610 2611 ++*pos; 2612 return im; 2613 } 2614 2615 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2616 __releases(RCU) 2617 { 2618 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2619 2620 if (likely(state->idev != NULL)) { 2621 read_unlock_bh(&state->idev->lock); 2622 state->idev = NULL; 2623 } 2624 state->dev = NULL; 2625 rcu_read_unlock(); 2626 } 2627 2628 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2629 { 2630 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2631 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2632 2633 seq_printf(seq, 2634 "%-4d %-15s %pi6 %5d %08X %ld\n", 2635 state->dev->ifindex, state->dev->name, 2636 &im->mca_addr, 2637 im->mca_users, im->mca_flags, 2638 (im->mca_flags&MAF_TIMER_RUNNING) ? 2639 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2640 return 0; 2641 } 2642 2643 static const struct seq_operations igmp6_mc_seq_ops = { 2644 .start = igmp6_mc_seq_start, 2645 .next = igmp6_mc_seq_next, 2646 .stop = igmp6_mc_seq_stop, 2647 .show = igmp6_mc_seq_show, 2648 }; 2649 2650 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2651 { 2652 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2653 sizeof(struct igmp6_mc_iter_state)); 2654 } 2655 2656 static const struct file_operations igmp6_mc_seq_fops = { 2657 .owner = THIS_MODULE, 2658 .open = igmp6_mc_seq_open, 2659 .read = seq_read, 2660 .llseek = seq_lseek, 2661 .release = seq_release_net, 2662 }; 2663 2664 struct igmp6_mcf_iter_state { 2665 struct seq_net_private p; 2666 struct net_device *dev; 2667 struct inet6_dev *idev; 2668 struct ifmcaddr6 *im; 2669 }; 2670 2671 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2672 2673 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2674 { 2675 struct ip6_sf_list *psf = NULL; 2676 struct ifmcaddr6 *im = NULL; 2677 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2678 struct net *net = seq_file_net(seq); 2679 2680 state->idev = NULL; 2681 state->im = NULL; 2682 for_each_netdev_rcu(net, state->dev) { 2683 struct inet6_dev *idev; 2684 idev = __in6_dev_get(state->dev); 2685 if (unlikely(idev == NULL)) 2686 continue; 2687 read_lock_bh(&idev->lock); 2688 im = idev->mc_list; 2689 if (likely(im != NULL)) { 2690 spin_lock_bh(&im->mca_lock); 2691 psf = im->mca_sources; 2692 if (likely(psf != NULL)) { 2693 state->im = im; 2694 state->idev = idev; 2695 break; 2696 } 2697 spin_unlock_bh(&im->mca_lock); 2698 } 2699 read_unlock_bh(&idev->lock); 2700 } 2701 return psf; 2702 } 2703 2704 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2705 { 2706 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2707 2708 psf = psf->sf_next; 2709 while (!psf) { 2710 spin_unlock_bh(&state->im->mca_lock); 2711 state->im = state->im->next; 2712 while (!state->im) { 2713 if (likely(state->idev != NULL)) 2714 read_unlock_bh(&state->idev->lock); 2715 2716 state->dev = next_net_device_rcu(state->dev); 2717 if (!state->dev) { 2718 state->idev = NULL; 2719 goto out; 2720 } 2721 state->idev = __in6_dev_get(state->dev); 2722 if (!state->idev) 2723 continue; 2724 read_lock_bh(&state->idev->lock); 2725 state->im = state->idev->mc_list; 2726 } 2727 if (!state->im) 2728 break; 2729 spin_lock_bh(&state->im->mca_lock); 2730 psf = state->im->mca_sources; 2731 } 2732 out: 2733 return psf; 2734 } 2735 2736 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2737 { 2738 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2739 if (psf) 2740 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2741 --pos; 2742 return pos ? NULL : psf; 2743 } 2744 2745 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2746 __acquires(RCU) 2747 { 2748 rcu_read_lock(); 2749 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2750 } 2751 2752 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2753 { 2754 struct ip6_sf_list *psf; 2755 if (v == SEQ_START_TOKEN) 2756 psf = igmp6_mcf_get_first(seq); 2757 else 2758 psf = igmp6_mcf_get_next(seq, v); 2759 ++*pos; 2760 return psf; 2761 } 2762 2763 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2764 __releases(RCU) 2765 { 2766 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2767 if (likely(state->im != NULL)) { 2768 spin_unlock_bh(&state->im->mca_lock); 2769 state->im = NULL; 2770 } 2771 if (likely(state->idev != NULL)) { 2772 read_unlock_bh(&state->idev->lock); 2773 state->idev = NULL; 2774 } 2775 state->dev = NULL; 2776 rcu_read_unlock(); 2777 } 2778 2779 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2780 { 2781 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2782 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2783 2784 if (v == SEQ_START_TOKEN) { 2785 seq_printf(seq, 2786 "%3s %6s " 2787 "%32s %32s %6s %6s\n", "Idx", 2788 "Device", "Multicast Address", 2789 "Source Address", "INC", "EXC"); 2790 } else { 2791 seq_printf(seq, 2792 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2793 state->dev->ifindex, state->dev->name, 2794 &state->im->mca_addr, 2795 &psf->sf_addr, 2796 psf->sf_count[MCAST_INCLUDE], 2797 psf->sf_count[MCAST_EXCLUDE]); 2798 } 2799 return 0; 2800 } 2801 2802 static const struct seq_operations igmp6_mcf_seq_ops = { 2803 .start = igmp6_mcf_seq_start, 2804 .next = igmp6_mcf_seq_next, 2805 .stop = igmp6_mcf_seq_stop, 2806 .show = igmp6_mcf_seq_show, 2807 }; 2808 2809 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2810 { 2811 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2812 sizeof(struct igmp6_mcf_iter_state)); 2813 } 2814 2815 static const struct file_operations igmp6_mcf_seq_fops = { 2816 .owner = THIS_MODULE, 2817 .open = igmp6_mcf_seq_open, 2818 .read = seq_read, 2819 .llseek = seq_lseek, 2820 .release = seq_release_net, 2821 }; 2822 2823 static int __net_init igmp6_proc_init(struct net *net) 2824 { 2825 int err; 2826 2827 err = -ENOMEM; 2828 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) 2829 goto out; 2830 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, 2831 &igmp6_mcf_seq_fops)) 2832 goto out_proc_net_igmp6; 2833 2834 err = 0; 2835 out: 2836 return err; 2837 2838 out_proc_net_igmp6: 2839 remove_proc_entry("igmp6", net->proc_net); 2840 goto out; 2841 } 2842 2843 static void __net_exit igmp6_proc_exit(struct net *net) 2844 { 2845 remove_proc_entry("mcfilter6", net->proc_net); 2846 remove_proc_entry("igmp6", net->proc_net); 2847 } 2848 #else 2849 static inline int igmp6_proc_init(struct net *net) 2850 { 2851 return 0; 2852 } 2853 static inline void igmp6_proc_exit(struct net *net) 2854 { 2855 } 2856 #endif 2857 2858 static int __net_init igmp6_net_init(struct net *net) 2859 { 2860 int err; 2861 2862 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2863 SOCK_RAW, IPPROTO_ICMPV6, net); 2864 if (err < 0) { 2865 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2866 err); 2867 goto out; 2868 } 2869 2870 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2871 2872 err = igmp6_proc_init(net); 2873 if (err) 2874 goto out_sock_create; 2875 out: 2876 return err; 2877 2878 out_sock_create: 2879 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2880 goto out; 2881 } 2882 2883 static void __net_exit igmp6_net_exit(struct net *net) 2884 { 2885 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2886 igmp6_proc_exit(net); 2887 } 2888 2889 static struct pernet_operations igmp6_net_ops = { 2890 .init = igmp6_net_init, 2891 .exit = igmp6_net_exit, 2892 }; 2893 2894 int __init igmp6_init(void) 2895 { 2896 return register_pernet_subsys(&igmp6_net_ops); 2897 } 2898 2899 void igmp6_cleanup(void) 2900 { 2901 unregister_pernet_subsys(&igmp6_net_ops); 2902 } 2903