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 = prandom_u32() % 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 = prandom_u32() % 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 = prandom_u32() % 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 = prandom_u32() % 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 /* RFC3810 6.2 1305 * Upon reception of an MLD message that contains a Query, the node 1306 * checks if the source address of the message is a valid link-local 1307 * address, if the Hop Limit is set to 1, and if the Router Alert 1308 * option is present in the Hop-By-Hop Options header of the IPv6 1309 * packet. If any of these checks fails, the packet is dropped. 1310 */ 1311 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1312 ipv6_hdr(skb)->hop_limit != 1 || 1313 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1314 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1315 return -EINVAL; 1316 1317 idev = __in6_dev_get(skb->dev); 1318 if (idev == NULL) 1319 return 0; 1320 1321 mld = (struct mld_msg *)icmp6_hdr(skb); 1322 group = &mld->mld_mca; 1323 group_type = ipv6_addr_type(group); 1324 1325 if (group_type != IPV6_ADDR_ANY && 1326 !(group_type&IPV6_ADDR_MULTICAST)) 1327 return -EINVAL; 1328 1329 if (len == MLD_V1_QUERY_LEN) { 1330 err = mld_process_v1(idev, mld, &max_delay); 1331 if (err < 0) 1332 return err; 1333 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1334 int srcs_offset = sizeof(struct mld2_query) - 1335 sizeof(struct icmp6hdr); 1336 1337 if (!pskb_may_pull(skb, srcs_offset)) 1338 return -EINVAL; 1339 1340 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1341 1342 err = mld_process_v2(idev, mlh2, &max_delay); 1343 if (err < 0) 1344 return err; 1345 1346 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1347 if (mlh2->mld2q_nsrcs) 1348 return -EINVAL; /* no sources allowed */ 1349 1350 mld_gq_start_timer(idev); 1351 return 0; 1352 } 1353 /* mark sources to include, if group & source-specific */ 1354 if (mlh2->mld2q_nsrcs != 0) { 1355 if (!pskb_may_pull(skb, srcs_offset + 1356 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1357 return -EINVAL; 1358 1359 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1360 mark = 1; 1361 } 1362 } else 1363 return -EINVAL; 1364 1365 read_lock_bh(&idev->lock); 1366 if (group_type == IPV6_ADDR_ANY) { 1367 for (ma = idev->mc_list; ma; ma=ma->next) { 1368 spin_lock_bh(&ma->mca_lock); 1369 igmp6_group_queried(ma, max_delay); 1370 spin_unlock_bh(&ma->mca_lock); 1371 } 1372 } else { 1373 for (ma = idev->mc_list; ma; ma=ma->next) { 1374 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1375 continue; 1376 spin_lock_bh(&ma->mca_lock); 1377 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1378 /* gsquery <- gsquery && mark */ 1379 if (!mark) 1380 ma->mca_flags &= ~MAF_GSQUERY; 1381 } else { 1382 /* gsquery <- mark */ 1383 if (mark) 1384 ma->mca_flags |= MAF_GSQUERY; 1385 else 1386 ma->mca_flags &= ~MAF_GSQUERY; 1387 } 1388 if (!(ma->mca_flags & MAF_GSQUERY) || 1389 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1390 igmp6_group_queried(ma, max_delay); 1391 spin_unlock_bh(&ma->mca_lock); 1392 break; 1393 } 1394 } 1395 read_unlock_bh(&idev->lock); 1396 1397 return 0; 1398 } 1399 1400 /* called with rcu_read_lock() */ 1401 int igmp6_event_report(struct sk_buff *skb) 1402 { 1403 struct ifmcaddr6 *ma; 1404 struct inet6_dev *idev; 1405 struct mld_msg *mld; 1406 int addr_type; 1407 1408 /* Our own report looped back. Ignore it. */ 1409 if (skb->pkt_type == PACKET_LOOPBACK) 1410 return 0; 1411 1412 /* send our report if the MC router may not have heard this report */ 1413 if (skb->pkt_type != PACKET_MULTICAST && 1414 skb->pkt_type != PACKET_BROADCAST) 1415 return 0; 1416 1417 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1418 return -EINVAL; 1419 1420 mld = (struct mld_msg *)icmp6_hdr(skb); 1421 1422 /* Drop reports with not link local source */ 1423 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1424 if (addr_type != IPV6_ADDR_ANY && 1425 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1426 return -EINVAL; 1427 1428 idev = __in6_dev_get(skb->dev); 1429 if (idev == NULL) 1430 return -ENODEV; 1431 1432 /* 1433 * Cancel the timer for this group 1434 */ 1435 1436 read_lock_bh(&idev->lock); 1437 for (ma = idev->mc_list; ma; ma=ma->next) { 1438 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1439 spin_lock(&ma->mca_lock); 1440 if (del_timer(&ma->mca_timer)) 1441 atomic_dec(&ma->mca_refcnt); 1442 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1443 spin_unlock(&ma->mca_lock); 1444 break; 1445 } 1446 } 1447 read_unlock_bh(&idev->lock); 1448 return 0; 1449 } 1450 1451 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1452 int gdeleted, int sdeleted) 1453 { 1454 switch (type) { 1455 case MLD2_MODE_IS_INCLUDE: 1456 case MLD2_MODE_IS_EXCLUDE: 1457 if (gdeleted || sdeleted) 1458 return false; 1459 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1460 if (pmc->mca_sfmode == MCAST_INCLUDE) 1461 return true; 1462 /* don't include if this source is excluded 1463 * in all filters 1464 */ 1465 if (psf->sf_count[MCAST_INCLUDE]) 1466 return type == MLD2_MODE_IS_INCLUDE; 1467 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1468 psf->sf_count[MCAST_EXCLUDE]; 1469 } 1470 return false; 1471 case MLD2_CHANGE_TO_INCLUDE: 1472 if (gdeleted || sdeleted) 1473 return false; 1474 return psf->sf_count[MCAST_INCLUDE] != 0; 1475 case MLD2_CHANGE_TO_EXCLUDE: 1476 if (gdeleted || sdeleted) 1477 return false; 1478 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1479 psf->sf_count[MCAST_INCLUDE]) 1480 return false; 1481 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1482 psf->sf_count[MCAST_EXCLUDE]; 1483 case MLD2_ALLOW_NEW_SOURCES: 1484 if (gdeleted || !psf->sf_crcount) 1485 return false; 1486 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1487 case MLD2_BLOCK_OLD_SOURCES: 1488 if (pmc->mca_sfmode == MCAST_INCLUDE) 1489 return gdeleted || (psf->sf_crcount && sdeleted); 1490 return psf->sf_crcount && !gdeleted && !sdeleted; 1491 } 1492 return false; 1493 } 1494 1495 static int 1496 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1497 { 1498 struct ip6_sf_list *psf; 1499 int scount = 0; 1500 1501 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1502 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1503 continue; 1504 scount++; 1505 } 1506 return scount; 1507 } 1508 1509 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1510 struct net_device *dev, 1511 const struct in6_addr *saddr, 1512 const struct in6_addr *daddr, 1513 int proto, int len) 1514 { 1515 struct ipv6hdr *hdr; 1516 1517 skb->protocol = htons(ETH_P_IPV6); 1518 skb->dev = dev; 1519 1520 skb_reset_network_header(skb); 1521 skb_put(skb, sizeof(struct ipv6hdr)); 1522 hdr = ipv6_hdr(skb); 1523 1524 ip6_flow_hdr(hdr, 0, 0); 1525 1526 hdr->payload_len = htons(len); 1527 hdr->nexthdr = proto; 1528 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1529 1530 hdr->saddr = *saddr; 1531 hdr->daddr = *daddr; 1532 } 1533 1534 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size) 1535 { 1536 struct net_device *dev = idev->dev; 1537 struct net *net = dev_net(dev); 1538 struct sock *sk = net->ipv6.igmp_sk; 1539 struct sk_buff *skb; 1540 struct mld2_report *pmr; 1541 struct in6_addr addr_buf; 1542 const struct in6_addr *saddr; 1543 int hlen = LL_RESERVED_SPACE(dev); 1544 int tlen = dev->needed_tailroom; 1545 int err; 1546 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1547 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1548 IPV6_TLV_PADN, 0 }; 1549 1550 /* we assume size > sizeof(ra) here */ 1551 size += hlen + tlen; 1552 /* limit our allocations to order-0 page */ 1553 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1554 skb = sock_alloc_send_skb(sk, size, 1, &err); 1555 1556 if (!skb) 1557 return NULL; 1558 1559 skb->priority = TC_PRIO_CONTROL; 1560 skb_reserve(skb, hlen); 1561 1562 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1563 /* <draft-ietf-magma-mld-source-05.txt>: 1564 * use unspecified address as the source address 1565 * when a valid link-local address is not available. 1566 */ 1567 saddr = &in6addr_any; 1568 } else 1569 saddr = &addr_buf; 1570 1571 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1572 1573 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1574 1575 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1576 skb_put(skb, sizeof(*pmr)); 1577 pmr = (struct mld2_report *)skb_transport_header(skb); 1578 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1579 pmr->mld2r_resv1 = 0; 1580 pmr->mld2r_cksum = 0; 1581 pmr->mld2r_resv2 = 0; 1582 pmr->mld2r_ngrec = 0; 1583 return skb; 1584 } 1585 1586 static void mld_sendpack(struct sk_buff *skb) 1587 { 1588 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1589 struct mld2_report *pmr = 1590 (struct mld2_report *)skb_transport_header(skb); 1591 int payload_len, mldlen; 1592 struct inet6_dev *idev; 1593 struct net *net = dev_net(skb->dev); 1594 int err; 1595 struct flowi6 fl6; 1596 struct dst_entry *dst; 1597 1598 rcu_read_lock(); 1599 idev = __in6_dev_get(skb->dev); 1600 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1601 1602 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1603 sizeof(*pip6); 1604 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1605 pip6->payload_len = htons(payload_len); 1606 1607 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1608 IPPROTO_ICMPV6, 1609 csum_partial(skb_transport_header(skb), 1610 mldlen, 0)); 1611 1612 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1613 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1614 skb->dev->ifindex); 1615 dst = icmp6_dst_alloc(skb->dev, &fl6); 1616 1617 err = 0; 1618 if (IS_ERR(dst)) { 1619 err = PTR_ERR(dst); 1620 dst = NULL; 1621 } 1622 skb_dst_set(skb, dst); 1623 if (err) 1624 goto err_out; 1625 1626 payload_len = skb->len; 1627 1628 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1629 dst_output); 1630 out: 1631 if (!err) { 1632 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1633 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1634 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1635 } else { 1636 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1637 } 1638 1639 rcu_read_unlock(); 1640 return; 1641 1642 err_out: 1643 kfree_skb(skb); 1644 goto out; 1645 } 1646 1647 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1648 { 1649 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1650 } 1651 1652 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1653 int type, struct mld2_grec **ppgr) 1654 { 1655 struct net_device *dev = pmc->idev->dev; 1656 struct mld2_report *pmr; 1657 struct mld2_grec *pgr; 1658 1659 if (!skb) 1660 skb = mld_newpack(pmc->idev, dev->mtu); 1661 if (!skb) 1662 return NULL; 1663 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1664 pgr->grec_type = type; 1665 pgr->grec_auxwords = 0; 1666 pgr->grec_nsrcs = 0; 1667 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1668 pmr = (struct mld2_report *)skb_transport_header(skb); 1669 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1670 *ppgr = pgr; 1671 return skb; 1672 } 1673 1674 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1675 skb_tailroom(skb)) : 0) 1676 1677 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1678 int type, int gdeleted, int sdeleted, int crsend) 1679 { 1680 struct inet6_dev *idev = pmc->idev; 1681 struct net_device *dev = idev->dev; 1682 struct mld2_report *pmr; 1683 struct mld2_grec *pgr = NULL; 1684 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1685 int scount, stotal, first, isquery, truncate; 1686 1687 if (pmc->mca_flags & MAF_NOREPORT) 1688 return skb; 1689 1690 isquery = type == MLD2_MODE_IS_INCLUDE || 1691 type == MLD2_MODE_IS_EXCLUDE; 1692 truncate = type == MLD2_MODE_IS_EXCLUDE || 1693 type == MLD2_CHANGE_TO_EXCLUDE; 1694 1695 stotal = scount = 0; 1696 1697 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1698 1699 if (!*psf_list) 1700 goto empty_source; 1701 1702 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1703 1704 /* EX and TO_EX get a fresh packet, if needed */ 1705 if (truncate) { 1706 if (pmr && pmr->mld2r_ngrec && 1707 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1708 if (skb) 1709 mld_sendpack(skb); 1710 skb = mld_newpack(idev, dev->mtu); 1711 } 1712 } 1713 first = 1; 1714 psf_prev = NULL; 1715 for (psf=*psf_list; psf; psf=psf_next) { 1716 struct in6_addr *psrc; 1717 1718 psf_next = psf->sf_next; 1719 1720 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1721 psf_prev = psf; 1722 continue; 1723 } 1724 1725 /* clear marks on query responses */ 1726 if (isquery) 1727 psf->sf_gsresp = 0; 1728 1729 if (AVAILABLE(skb) < sizeof(*psrc) + 1730 first*sizeof(struct mld2_grec)) { 1731 if (truncate && !first) 1732 break; /* truncate these */ 1733 if (pgr) 1734 pgr->grec_nsrcs = htons(scount); 1735 if (skb) 1736 mld_sendpack(skb); 1737 skb = mld_newpack(idev, dev->mtu); 1738 first = 1; 1739 scount = 0; 1740 } 1741 if (first) { 1742 skb = add_grhead(skb, pmc, type, &pgr); 1743 first = 0; 1744 } 1745 if (!skb) 1746 return NULL; 1747 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1748 *psrc = psf->sf_addr; 1749 scount++; stotal++; 1750 if ((type == MLD2_ALLOW_NEW_SOURCES || 1751 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1752 psf->sf_crcount--; 1753 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1754 if (psf_prev) 1755 psf_prev->sf_next = psf->sf_next; 1756 else 1757 *psf_list = psf->sf_next; 1758 kfree(psf); 1759 continue; 1760 } 1761 } 1762 psf_prev = psf; 1763 } 1764 1765 empty_source: 1766 if (!stotal) { 1767 if (type == MLD2_ALLOW_NEW_SOURCES || 1768 type == MLD2_BLOCK_OLD_SOURCES) 1769 return skb; 1770 if (pmc->mca_crcount || isquery || crsend) { 1771 /* make sure we have room for group header */ 1772 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1773 mld_sendpack(skb); 1774 skb = NULL; /* add_grhead will get a new one */ 1775 } 1776 skb = add_grhead(skb, pmc, type, &pgr); 1777 } 1778 } 1779 if (pgr) 1780 pgr->grec_nsrcs = htons(scount); 1781 1782 if (isquery) 1783 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1784 return skb; 1785 } 1786 1787 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1788 { 1789 struct sk_buff *skb = NULL; 1790 int type; 1791 1792 read_lock_bh(&idev->lock); 1793 if (!pmc) { 1794 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1795 if (pmc->mca_flags & MAF_NOREPORT) 1796 continue; 1797 spin_lock_bh(&pmc->mca_lock); 1798 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1799 type = MLD2_MODE_IS_EXCLUDE; 1800 else 1801 type = MLD2_MODE_IS_INCLUDE; 1802 skb = add_grec(skb, pmc, type, 0, 0, 0); 1803 spin_unlock_bh(&pmc->mca_lock); 1804 } 1805 } else { 1806 spin_lock_bh(&pmc->mca_lock); 1807 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1808 type = MLD2_MODE_IS_EXCLUDE; 1809 else 1810 type = MLD2_MODE_IS_INCLUDE; 1811 skb = add_grec(skb, pmc, type, 0, 0, 0); 1812 spin_unlock_bh(&pmc->mca_lock); 1813 } 1814 read_unlock_bh(&idev->lock); 1815 if (skb) 1816 mld_sendpack(skb); 1817 } 1818 1819 /* 1820 * remove zero-count source records from a source filter list 1821 */ 1822 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1823 { 1824 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1825 1826 psf_prev = NULL; 1827 for (psf=*ppsf; psf; psf = psf_next) { 1828 psf_next = psf->sf_next; 1829 if (psf->sf_crcount == 0) { 1830 if (psf_prev) 1831 psf_prev->sf_next = psf->sf_next; 1832 else 1833 *ppsf = psf->sf_next; 1834 kfree(psf); 1835 } else 1836 psf_prev = psf; 1837 } 1838 } 1839 1840 static void mld_send_cr(struct inet6_dev *idev) 1841 { 1842 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1843 struct sk_buff *skb = NULL; 1844 int type, dtype; 1845 1846 read_lock_bh(&idev->lock); 1847 spin_lock(&idev->mc_lock); 1848 1849 /* deleted MCA's */ 1850 pmc_prev = NULL; 1851 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1852 pmc_next = pmc->next; 1853 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1854 type = MLD2_BLOCK_OLD_SOURCES; 1855 dtype = MLD2_BLOCK_OLD_SOURCES; 1856 skb = add_grec(skb, pmc, type, 1, 0, 0); 1857 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 1858 } 1859 if (pmc->mca_crcount) { 1860 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1861 type = MLD2_CHANGE_TO_INCLUDE; 1862 skb = add_grec(skb, pmc, type, 1, 0, 0); 1863 } 1864 pmc->mca_crcount--; 1865 if (pmc->mca_crcount == 0) { 1866 mld_clear_zeros(&pmc->mca_tomb); 1867 mld_clear_zeros(&pmc->mca_sources); 1868 } 1869 } 1870 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1871 !pmc->mca_sources) { 1872 if (pmc_prev) 1873 pmc_prev->next = pmc_next; 1874 else 1875 idev->mc_tomb = pmc_next; 1876 in6_dev_put(pmc->idev); 1877 kfree(pmc); 1878 } else 1879 pmc_prev = pmc; 1880 } 1881 spin_unlock(&idev->mc_lock); 1882 1883 /* change recs */ 1884 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1885 spin_lock_bh(&pmc->mca_lock); 1886 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1887 type = MLD2_BLOCK_OLD_SOURCES; 1888 dtype = MLD2_ALLOW_NEW_SOURCES; 1889 } else { 1890 type = MLD2_ALLOW_NEW_SOURCES; 1891 dtype = MLD2_BLOCK_OLD_SOURCES; 1892 } 1893 skb = add_grec(skb, pmc, type, 0, 0, 0); 1894 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 1895 1896 /* filter mode changes */ 1897 if (pmc->mca_crcount) { 1898 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1899 type = MLD2_CHANGE_TO_EXCLUDE; 1900 else 1901 type = MLD2_CHANGE_TO_INCLUDE; 1902 skb = add_grec(skb, pmc, type, 0, 0, 0); 1903 pmc->mca_crcount--; 1904 } 1905 spin_unlock_bh(&pmc->mca_lock); 1906 } 1907 read_unlock_bh(&idev->lock); 1908 if (!skb) 1909 return; 1910 (void) mld_sendpack(skb); 1911 } 1912 1913 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1914 { 1915 struct net *net = dev_net(dev); 1916 struct sock *sk = net->ipv6.igmp_sk; 1917 struct inet6_dev *idev; 1918 struct sk_buff *skb; 1919 struct mld_msg *hdr; 1920 const struct in6_addr *snd_addr, *saddr; 1921 struct in6_addr addr_buf; 1922 int hlen = LL_RESERVED_SPACE(dev); 1923 int tlen = dev->needed_tailroom; 1924 int err, len, payload_len, full_len; 1925 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1926 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1927 IPV6_TLV_PADN, 0 }; 1928 struct flowi6 fl6; 1929 struct dst_entry *dst; 1930 1931 if (type == ICMPV6_MGM_REDUCTION) 1932 snd_addr = &in6addr_linklocal_allrouters; 1933 else 1934 snd_addr = addr; 1935 1936 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1937 payload_len = len + sizeof(ra); 1938 full_len = sizeof(struct ipv6hdr) + payload_len; 1939 1940 rcu_read_lock(); 1941 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1942 IPSTATS_MIB_OUT, full_len); 1943 rcu_read_unlock(); 1944 1945 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1946 1947 if (skb == NULL) { 1948 rcu_read_lock(); 1949 IP6_INC_STATS(net, __in6_dev_get(dev), 1950 IPSTATS_MIB_OUTDISCARDS); 1951 rcu_read_unlock(); 1952 return; 1953 } 1954 skb->priority = TC_PRIO_CONTROL; 1955 skb_reserve(skb, hlen); 1956 1957 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1958 /* <draft-ietf-magma-mld-source-05.txt>: 1959 * use unspecified address as the source address 1960 * when a valid link-local address is not available. 1961 */ 1962 saddr = &in6addr_any; 1963 } else 1964 saddr = &addr_buf; 1965 1966 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1967 1968 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1969 1970 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1971 memset(hdr, 0, sizeof(struct mld_msg)); 1972 hdr->mld_type = type; 1973 hdr->mld_mca = *addr; 1974 1975 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1976 IPPROTO_ICMPV6, 1977 csum_partial(hdr, len, 0)); 1978 1979 rcu_read_lock(); 1980 idev = __in6_dev_get(skb->dev); 1981 1982 icmpv6_flow_init(sk, &fl6, type, 1983 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1984 skb->dev->ifindex); 1985 dst = icmp6_dst_alloc(skb->dev, &fl6); 1986 if (IS_ERR(dst)) { 1987 err = PTR_ERR(dst); 1988 goto err_out; 1989 } 1990 1991 skb_dst_set(skb, dst); 1992 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1993 dst_output); 1994 out: 1995 if (!err) { 1996 ICMP6MSGOUT_INC_STATS(net, idev, type); 1997 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1998 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1999 } else 2000 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2001 2002 rcu_read_unlock(); 2003 return; 2004 2005 err_out: 2006 kfree_skb(skb); 2007 goto out; 2008 } 2009 2010 static void mld_send_initial_cr(struct inet6_dev *idev) 2011 { 2012 struct sk_buff *skb; 2013 struct ifmcaddr6 *pmc; 2014 int type; 2015 2016 if (mld_in_v1_mode(idev)) 2017 return; 2018 2019 skb = NULL; 2020 read_lock_bh(&idev->lock); 2021 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2022 spin_lock_bh(&pmc->mca_lock); 2023 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2024 type = MLD2_CHANGE_TO_EXCLUDE; 2025 else 2026 type = MLD2_CHANGE_TO_INCLUDE; 2027 skb = add_grec(skb, pmc, type, 0, 0, 1); 2028 spin_unlock_bh(&pmc->mca_lock); 2029 } 2030 read_unlock_bh(&idev->lock); 2031 if (skb) 2032 mld_sendpack(skb); 2033 } 2034 2035 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2036 { 2037 idev->mc_dad_count = idev->mc_qrv; 2038 if (idev->mc_dad_count) { 2039 mld_send_initial_cr(idev); 2040 idev->mc_dad_count--; 2041 if (idev->mc_dad_count) 2042 mld_dad_start_timer(idev, idev->mc_maxdelay); 2043 } 2044 } 2045 2046 static void mld_dad_timer_expire(unsigned long data) 2047 { 2048 struct inet6_dev *idev = (struct inet6_dev *)data; 2049 2050 mld_send_initial_cr(idev); 2051 if (idev->mc_dad_count) { 2052 idev->mc_dad_count--; 2053 if (idev->mc_dad_count) 2054 mld_dad_start_timer(idev, idev->mc_maxdelay); 2055 } 2056 in6_dev_put(idev); 2057 } 2058 2059 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2060 const struct in6_addr *psfsrc) 2061 { 2062 struct ip6_sf_list *psf, *psf_prev; 2063 int rv = 0; 2064 2065 psf_prev = NULL; 2066 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2067 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2068 break; 2069 psf_prev = psf; 2070 } 2071 if (!psf || psf->sf_count[sfmode] == 0) { 2072 /* source filter not found, or count wrong => bug */ 2073 return -ESRCH; 2074 } 2075 psf->sf_count[sfmode]--; 2076 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2077 struct inet6_dev *idev = pmc->idev; 2078 2079 /* no more filters for this source */ 2080 if (psf_prev) 2081 psf_prev->sf_next = psf->sf_next; 2082 else 2083 pmc->mca_sources = psf->sf_next; 2084 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2085 !mld_in_v1_mode(idev)) { 2086 psf->sf_crcount = idev->mc_qrv; 2087 psf->sf_next = pmc->mca_tomb; 2088 pmc->mca_tomb = psf; 2089 rv = 1; 2090 } else 2091 kfree(psf); 2092 } 2093 return rv; 2094 } 2095 2096 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2097 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2098 int delta) 2099 { 2100 struct ifmcaddr6 *pmc; 2101 int changerec = 0; 2102 int i, err; 2103 2104 if (!idev) 2105 return -ENODEV; 2106 read_lock_bh(&idev->lock); 2107 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2108 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2109 break; 2110 } 2111 if (!pmc) { 2112 /* MCA not found?? bug */ 2113 read_unlock_bh(&idev->lock); 2114 return -ESRCH; 2115 } 2116 spin_lock_bh(&pmc->mca_lock); 2117 sf_markstate(pmc); 2118 if (!delta) { 2119 if (!pmc->mca_sfcount[sfmode]) { 2120 spin_unlock_bh(&pmc->mca_lock); 2121 read_unlock_bh(&idev->lock); 2122 return -EINVAL; 2123 } 2124 pmc->mca_sfcount[sfmode]--; 2125 } 2126 err = 0; 2127 for (i=0; i<sfcount; i++) { 2128 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2129 2130 changerec |= rv > 0; 2131 if (!err && rv < 0) 2132 err = rv; 2133 } 2134 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2135 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2136 pmc->mca_sfcount[MCAST_INCLUDE]) { 2137 struct ip6_sf_list *psf; 2138 2139 /* filter mode change */ 2140 pmc->mca_sfmode = MCAST_INCLUDE; 2141 pmc->mca_crcount = idev->mc_qrv; 2142 idev->mc_ifc_count = pmc->mca_crcount; 2143 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2144 psf->sf_crcount = 0; 2145 mld_ifc_event(pmc->idev); 2146 } else if (sf_setstate(pmc) || changerec) 2147 mld_ifc_event(pmc->idev); 2148 spin_unlock_bh(&pmc->mca_lock); 2149 read_unlock_bh(&idev->lock); 2150 return err; 2151 } 2152 2153 /* 2154 * Add multicast single-source filter to the interface list 2155 */ 2156 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2157 const struct in6_addr *psfsrc) 2158 { 2159 struct ip6_sf_list *psf, *psf_prev; 2160 2161 psf_prev = NULL; 2162 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2163 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2164 break; 2165 psf_prev = psf; 2166 } 2167 if (!psf) { 2168 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 2169 if (!psf) 2170 return -ENOBUFS; 2171 2172 psf->sf_addr = *psfsrc; 2173 if (psf_prev) { 2174 psf_prev->sf_next = psf; 2175 } else 2176 pmc->mca_sources = psf; 2177 } 2178 psf->sf_count[sfmode]++; 2179 return 0; 2180 } 2181 2182 static void sf_markstate(struct ifmcaddr6 *pmc) 2183 { 2184 struct ip6_sf_list *psf; 2185 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2186 2187 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 2188 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2189 psf->sf_oldin = mca_xcount == 2190 psf->sf_count[MCAST_EXCLUDE] && 2191 !psf->sf_count[MCAST_INCLUDE]; 2192 } else 2193 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2194 } 2195 2196 static int sf_setstate(struct ifmcaddr6 *pmc) 2197 { 2198 struct ip6_sf_list *psf, *dpsf; 2199 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2200 int qrv = pmc->idev->mc_qrv; 2201 int new_in, rv; 2202 2203 rv = 0; 2204 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2205 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2206 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2207 !psf->sf_count[MCAST_INCLUDE]; 2208 } else 2209 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2210 if (new_in) { 2211 if (!psf->sf_oldin) { 2212 struct ip6_sf_list *prev = NULL; 2213 2214 for (dpsf=pmc->mca_tomb; dpsf; 2215 dpsf=dpsf->sf_next) { 2216 if (ipv6_addr_equal(&dpsf->sf_addr, 2217 &psf->sf_addr)) 2218 break; 2219 prev = dpsf; 2220 } 2221 if (dpsf) { 2222 if (prev) 2223 prev->sf_next = dpsf->sf_next; 2224 else 2225 pmc->mca_tomb = dpsf->sf_next; 2226 kfree(dpsf); 2227 } 2228 psf->sf_crcount = qrv; 2229 rv++; 2230 } 2231 } else if (psf->sf_oldin) { 2232 psf->sf_crcount = 0; 2233 /* 2234 * add or update "delete" records if an active filter 2235 * is now inactive 2236 */ 2237 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2238 if (ipv6_addr_equal(&dpsf->sf_addr, 2239 &psf->sf_addr)) 2240 break; 2241 if (!dpsf) { 2242 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2243 if (!dpsf) 2244 continue; 2245 *dpsf = *psf; 2246 /* pmc->mca_lock held by callers */ 2247 dpsf->sf_next = pmc->mca_tomb; 2248 pmc->mca_tomb = dpsf; 2249 } 2250 dpsf->sf_crcount = qrv; 2251 rv++; 2252 } 2253 } 2254 return rv; 2255 } 2256 2257 /* 2258 * Add multicast source filter list to the interface list 2259 */ 2260 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2261 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2262 int delta) 2263 { 2264 struct ifmcaddr6 *pmc; 2265 int isexclude; 2266 int i, err; 2267 2268 if (!idev) 2269 return -ENODEV; 2270 read_lock_bh(&idev->lock); 2271 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2272 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2273 break; 2274 } 2275 if (!pmc) { 2276 /* MCA not found?? bug */ 2277 read_unlock_bh(&idev->lock); 2278 return -ESRCH; 2279 } 2280 spin_lock_bh(&pmc->mca_lock); 2281 2282 sf_markstate(pmc); 2283 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2284 if (!delta) 2285 pmc->mca_sfcount[sfmode]++; 2286 err = 0; 2287 for (i=0; i<sfcount; i++) { 2288 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2289 if (err) 2290 break; 2291 } 2292 if (err) { 2293 int j; 2294 2295 if (!delta) 2296 pmc->mca_sfcount[sfmode]--; 2297 for (j=0; j<i; j++) 2298 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2299 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2300 struct ip6_sf_list *psf; 2301 2302 /* filter mode change */ 2303 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2304 pmc->mca_sfmode = MCAST_EXCLUDE; 2305 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2306 pmc->mca_sfmode = MCAST_INCLUDE; 2307 /* else no filters; keep old mode for reports */ 2308 2309 pmc->mca_crcount = idev->mc_qrv; 2310 idev->mc_ifc_count = pmc->mca_crcount; 2311 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2312 psf->sf_crcount = 0; 2313 mld_ifc_event(idev); 2314 } else if (sf_setstate(pmc)) 2315 mld_ifc_event(idev); 2316 spin_unlock_bh(&pmc->mca_lock); 2317 read_unlock_bh(&idev->lock); 2318 return err; 2319 } 2320 2321 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2322 { 2323 struct ip6_sf_list *psf, *nextpsf; 2324 2325 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2326 nextpsf = psf->sf_next; 2327 kfree(psf); 2328 } 2329 pmc->mca_tomb = NULL; 2330 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2331 nextpsf = psf->sf_next; 2332 kfree(psf); 2333 } 2334 pmc->mca_sources = NULL; 2335 pmc->mca_sfmode = MCAST_EXCLUDE; 2336 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2337 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2338 } 2339 2340 2341 static void igmp6_join_group(struct ifmcaddr6 *ma) 2342 { 2343 unsigned long delay; 2344 2345 if (ma->mca_flags & MAF_NOREPORT) 2346 return; 2347 2348 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2349 2350 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2351 2352 spin_lock_bh(&ma->mca_lock); 2353 if (del_timer(&ma->mca_timer)) { 2354 atomic_dec(&ma->mca_refcnt); 2355 delay = ma->mca_timer.expires - jiffies; 2356 } 2357 2358 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2359 atomic_inc(&ma->mca_refcnt); 2360 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2361 spin_unlock_bh(&ma->mca_lock); 2362 } 2363 2364 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2365 struct inet6_dev *idev) 2366 { 2367 int err; 2368 2369 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2370 * so no other readers or writers of iml or its sflist 2371 */ 2372 if (!iml->sflist) { 2373 /* any-source empty exclude case */ 2374 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2375 } 2376 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2377 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2378 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2379 iml->sflist = NULL; 2380 return err; 2381 } 2382 2383 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2384 { 2385 if (mld_in_v1_mode(ma->idev)) { 2386 if (ma->mca_flags & MAF_LAST_REPORTER) 2387 igmp6_send(&ma->mca_addr, ma->idev->dev, 2388 ICMPV6_MGM_REDUCTION); 2389 } else { 2390 mld_add_delrec(ma->idev, ma); 2391 mld_ifc_event(ma->idev); 2392 } 2393 } 2394 2395 static void mld_gq_timer_expire(unsigned long data) 2396 { 2397 struct inet6_dev *idev = (struct inet6_dev *)data; 2398 2399 idev->mc_gq_running = 0; 2400 mld_send_report(idev, NULL); 2401 in6_dev_put(idev); 2402 } 2403 2404 static void mld_ifc_timer_expire(unsigned long data) 2405 { 2406 struct inet6_dev *idev = (struct inet6_dev *)data; 2407 2408 mld_send_cr(idev); 2409 if (idev->mc_ifc_count) { 2410 idev->mc_ifc_count--; 2411 if (idev->mc_ifc_count) 2412 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2413 } 2414 in6_dev_put(idev); 2415 } 2416 2417 static void mld_ifc_event(struct inet6_dev *idev) 2418 { 2419 if (mld_in_v1_mode(idev)) 2420 return; 2421 idev->mc_ifc_count = idev->mc_qrv; 2422 mld_ifc_start_timer(idev, 1); 2423 } 2424 2425 2426 static void igmp6_timer_handler(unsigned long data) 2427 { 2428 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2429 2430 if (mld_in_v1_mode(ma->idev)) 2431 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2432 else 2433 mld_send_report(ma->idev, ma); 2434 2435 spin_lock(&ma->mca_lock); 2436 ma->mca_flags |= MAF_LAST_REPORTER; 2437 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2438 spin_unlock(&ma->mca_lock); 2439 ma_put(ma); 2440 } 2441 2442 /* Device changing type */ 2443 2444 void ipv6_mc_unmap(struct inet6_dev *idev) 2445 { 2446 struct ifmcaddr6 *i; 2447 2448 /* Install multicast list, except for all-nodes (already installed) */ 2449 2450 read_lock_bh(&idev->lock); 2451 for (i = idev->mc_list; i; i = i->next) 2452 igmp6_group_dropped(i); 2453 read_unlock_bh(&idev->lock); 2454 } 2455 2456 void ipv6_mc_remap(struct inet6_dev *idev) 2457 { 2458 ipv6_mc_up(idev); 2459 } 2460 2461 /* Device going down */ 2462 2463 void ipv6_mc_down(struct inet6_dev *idev) 2464 { 2465 struct ifmcaddr6 *i; 2466 2467 /* Withdraw multicast list */ 2468 2469 read_lock_bh(&idev->lock); 2470 mld_ifc_stop_timer(idev); 2471 mld_gq_stop_timer(idev); 2472 mld_dad_stop_timer(idev); 2473 2474 for (i = idev->mc_list; i; i=i->next) 2475 igmp6_group_dropped(i); 2476 read_unlock_bh(&idev->lock); 2477 2478 mld_clear_delrec(idev); 2479 } 2480 2481 2482 /* Device going up */ 2483 2484 void ipv6_mc_up(struct inet6_dev *idev) 2485 { 2486 struct ifmcaddr6 *i; 2487 2488 /* Install multicast list, except for all-nodes (already installed) */ 2489 2490 read_lock_bh(&idev->lock); 2491 for (i = idev->mc_list; i; i=i->next) 2492 igmp6_group_added(i); 2493 read_unlock_bh(&idev->lock); 2494 } 2495 2496 /* IPv6 device initialization. */ 2497 2498 void ipv6_mc_init_dev(struct inet6_dev *idev) 2499 { 2500 write_lock_bh(&idev->lock); 2501 spin_lock_init(&idev->mc_lock); 2502 idev->mc_gq_running = 0; 2503 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2504 (unsigned long)idev); 2505 idev->mc_tomb = NULL; 2506 idev->mc_ifc_count = 0; 2507 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2508 (unsigned long)idev); 2509 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, 2510 (unsigned long)idev); 2511 2512 idev->mc_qrv = MLD_QRV_DEFAULT; 2513 idev->mc_qi = MLD_QI_DEFAULT; 2514 idev->mc_qri = MLD_QRI_DEFAULT; 2515 2516 idev->mc_maxdelay = unsolicited_report_interval(idev); 2517 idev->mc_v1_seen = 0; 2518 write_unlock_bh(&idev->lock); 2519 } 2520 2521 /* 2522 * Device is about to be destroyed: clean up. 2523 */ 2524 2525 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2526 { 2527 struct ifmcaddr6 *i; 2528 2529 /* Deactivate timers */ 2530 ipv6_mc_down(idev); 2531 2532 /* Delete all-nodes address. */ 2533 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2534 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2535 * fail. 2536 */ 2537 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2538 2539 if (idev->cnf.forwarding) 2540 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2541 2542 write_lock_bh(&idev->lock); 2543 while ((i = idev->mc_list) != NULL) { 2544 idev->mc_list = i->next; 2545 write_unlock_bh(&idev->lock); 2546 2547 igmp6_group_dropped(i); 2548 ma_put(i); 2549 2550 write_lock_bh(&idev->lock); 2551 } 2552 write_unlock_bh(&idev->lock); 2553 } 2554 2555 #ifdef CONFIG_PROC_FS 2556 struct igmp6_mc_iter_state { 2557 struct seq_net_private p; 2558 struct net_device *dev; 2559 struct inet6_dev *idev; 2560 }; 2561 2562 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2563 2564 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2565 { 2566 struct ifmcaddr6 *im = NULL; 2567 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2568 struct net *net = seq_file_net(seq); 2569 2570 state->idev = NULL; 2571 for_each_netdev_rcu(net, state->dev) { 2572 struct inet6_dev *idev; 2573 idev = __in6_dev_get(state->dev); 2574 if (!idev) 2575 continue; 2576 read_lock_bh(&idev->lock); 2577 im = idev->mc_list; 2578 if (im) { 2579 state->idev = idev; 2580 break; 2581 } 2582 read_unlock_bh(&idev->lock); 2583 } 2584 return im; 2585 } 2586 2587 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2588 { 2589 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2590 2591 im = im->next; 2592 while (!im) { 2593 if (likely(state->idev != NULL)) 2594 read_unlock_bh(&state->idev->lock); 2595 2596 state->dev = next_net_device_rcu(state->dev); 2597 if (!state->dev) { 2598 state->idev = NULL; 2599 break; 2600 } 2601 state->idev = __in6_dev_get(state->dev); 2602 if (!state->idev) 2603 continue; 2604 read_lock_bh(&state->idev->lock); 2605 im = state->idev->mc_list; 2606 } 2607 return im; 2608 } 2609 2610 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2611 { 2612 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2613 if (im) 2614 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2615 --pos; 2616 return pos ? NULL : im; 2617 } 2618 2619 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2620 __acquires(RCU) 2621 { 2622 rcu_read_lock(); 2623 return igmp6_mc_get_idx(seq, *pos); 2624 } 2625 2626 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2627 { 2628 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2629 2630 ++*pos; 2631 return im; 2632 } 2633 2634 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2635 __releases(RCU) 2636 { 2637 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2638 2639 if (likely(state->idev != NULL)) { 2640 read_unlock_bh(&state->idev->lock); 2641 state->idev = NULL; 2642 } 2643 state->dev = NULL; 2644 rcu_read_unlock(); 2645 } 2646 2647 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2648 { 2649 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2650 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2651 2652 seq_printf(seq, 2653 "%-4d %-15s %pi6 %5d %08X %ld\n", 2654 state->dev->ifindex, state->dev->name, 2655 &im->mca_addr, 2656 im->mca_users, im->mca_flags, 2657 (im->mca_flags&MAF_TIMER_RUNNING) ? 2658 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2659 return 0; 2660 } 2661 2662 static const struct seq_operations igmp6_mc_seq_ops = { 2663 .start = igmp6_mc_seq_start, 2664 .next = igmp6_mc_seq_next, 2665 .stop = igmp6_mc_seq_stop, 2666 .show = igmp6_mc_seq_show, 2667 }; 2668 2669 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2670 { 2671 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2672 sizeof(struct igmp6_mc_iter_state)); 2673 } 2674 2675 static const struct file_operations igmp6_mc_seq_fops = { 2676 .owner = THIS_MODULE, 2677 .open = igmp6_mc_seq_open, 2678 .read = seq_read, 2679 .llseek = seq_lseek, 2680 .release = seq_release_net, 2681 }; 2682 2683 struct igmp6_mcf_iter_state { 2684 struct seq_net_private p; 2685 struct net_device *dev; 2686 struct inet6_dev *idev; 2687 struct ifmcaddr6 *im; 2688 }; 2689 2690 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2691 2692 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2693 { 2694 struct ip6_sf_list *psf = NULL; 2695 struct ifmcaddr6 *im = NULL; 2696 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2697 struct net *net = seq_file_net(seq); 2698 2699 state->idev = NULL; 2700 state->im = NULL; 2701 for_each_netdev_rcu(net, state->dev) { 2702 struct inet6_dev *idev; 2703 idev = __in6_dev_get(state->dev); 2704 if (unlikely(idev == NULL)) 2705 continue; 2706 read_lock_bh(&idev->lock); 2707 im = idev->mc_list; 2708 if (likely(im != NULL)) { 2709 spin_lock_bh(&im->mca_lock); 2710 psf = im->mca_sources; 2711 if (likely(psf != NULL)) { 2712 state->im = im; 2713 state->idev = idev; 2714 break; 2715 } 2716 spin_unlock_bh(&im->mca_lock); 2717 } 2718 read_unlock_bh(&idev->lock); 2719 } 2720 return psf; 2721 } 2722 2723 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2724 { 2725 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2726 2727 psf = psf->sf_next; 2728 while (!psf) { 2729 spin_unlock_bh(&state->im->mca_lock); 2730 state->im = state->im->next; 2731 while (!state->im) { 2732 if (likely(state->idev != NULL)) 2733 read_unlock_bh(&state->idev->lock); 2734 2735 state->dev = next_net_device_rcu(state->dev); 2736 if (!state->dev) { 2737 state->idev = NULL; 2738 goto out; 2739 } 2740 state->idev = __in6_dev_get(state->dev); 2741 if (!state->idev) 2742 continue; 2743 read_lock_bh(&state->idev->lock); 2744 state->im = state->idev->mc_list; 2745 } 2746 if (!state->im) 2747 break; 2748 spin_lock_bh(&state->im->mca_lock); 2749 psf = state->im->mca_sources; 2750 } 2751 out: 2752 return psf; 2753 } 2754 2755 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2756 { 2757 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2758 if (psf) 2759 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2760 --pos; 2761 return pos ? NULL : psf; 2762 } 2763 2764 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2765 __acquires(RCU) 2766 { 2767 rcu_read_lock(); 2768 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2769 } 2770 2771 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2772 { 2773 struct ip6_sf_list *psf; 2774 if (v == SEQ_START_TOKEN) 2775 psf = igmp6_mcf_get_first(seq); 2776 else 2777 psf = igmp6_mcf_get_next(seq, v); 2778 ++*pos; 2779 return psf; 2780 } 2781 2782 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2783 __releases(RCU) 2784 { 2785 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2786 if (likely(state->im != NULL)) { 2787 spin_unlock_bh(&state->im->mca_lock); 2788 state->im = NULL; 2789 } 2790 if (likely(state->idev != NULL)) { 2791 read_unlock_bh(&state->idev->lock); 2792 state->idev = NULL; 2793 } 2794 state->dev = NULL; 2795 rcu_read_unlock(); 2796 } 2797 2798 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2799 { 2800 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2801 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2802 2803 if (v == SEQ_START_TOKEN) { 2804 seq_printf(seq, 2805 "%3s %6s " 2806 "%32s %32s %6s %6s\n", "Idx", 2807 "Device", "Multicast Address", 2808 "Source Address", "INC", "EXC"); 2809 } else { 2810 seq_printf(seq, 2811 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2812 state->dev->ifindex, state->dev->name, 2813 &state->im->mca_addr, 2814 &psf->sf_addr, 2815 psf->sf_count[MCAST_INCLUDE], 2816 psf->sf_count[MCAST_EXCLUDE]); 2817 } 2818 return 0; 2819 } 2820 2821 static const struct seq_operations igmp6_mcf_seq_ops = { 2822 .start = igmp6_mcf_seq_start, 2823 .next = igmp6_mcf_seq_next, 2824 .stop = igmp6_mcf_seq_stop, 2825 .show = igmp6_mcf_seq_show, 2826 }; 2827 2828 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2829 { 2830 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2831 sizeof(struct igmp6_mcf_iter_state)); 2832 } 2833 2834 static const struct file_operations igmp6_mcf_seq_fops = { 2835 .owner = THIS_MODULE, 2836 .open = igmp6_mcf_seq_open, 2837 .read = seq_read, 2838 .llseek = seq_lseek, 2839 .release = seq_release_net, 2840 }; 2841 2842 static int __net_init igmp6_proc_init(struct net *net) 2843 { 2844 int err; 2845 2846 err = -ENOMEM; 2847 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) 2848 goto out; 2849 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, 2850 &igmp6_mcf_seq_fops)) 2851 goto out_proc_net_igmp6; 2852 2853 err = 0; 2854 out: 2855 return err; 2856 2857 out_proc_net_igmp6: 2858 remove_proc_entry("igmp6", net->proc_net); 2859 goto out; 2860 } 2861 2862 static void __net_exit igmp6_proc_exit(struct net *net) 2863 { 2864 remove_proc_entry("mcfilter6", net->proc_net); 2865 remove_proc_entry("igmp6", net->proc_net); 2866 } 2867 #else 2868 static inline int igmp6_proc_init(struct net *net) 2869 { 2870 return 0; 2871 } 2872 static inline void igmp6_proc_exit(struct net *net) 2873 { 2874 } 2875 #endif 2876 2877 static int __net_init igmp6_net_init(struct net *net) 2878 { 2879 int err; 2880 2881 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2882 SOCK_RAW, IPPROTO_ICMPV6, net); 2883 if (err < 0) { 2884 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2885 err); 2886 goto out; 2887 } 2888 2889 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2890 2891 err = igmp6_proc_init(net); 2892 if (err) 2893 goto out_sock_create; 2894 out: 2895 return err; 2896 2897 out_sock_create: 2898 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2899 goto out; 2900 } 2901 2902 static void __net_exit igmp6_net_exit(struct net *net) 2903 { 2904 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2905 igmp6_proc_exit(net); 2906 } 2907 2908 static struct pernet_operations igmp6_net_ops = { 2909 .init = igmp6_net_init, 2910 .exit = igmp6_net_exit, 2911 }; 2912 2913 int __init igmp6_init(void) 2914 { 2915 return register_pernet_subsys(&igmp6_net_ops); 2916 } 2917 2918 void igmp6_cleanup(void) 2919 { 2920 unregister_pernet_subsys(&igmp6_net_ops); 2921 } 2922