1 /* 2 * Multicast support for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 /* Changes: 17 * 18 * yoshfuji : fix format of router-alert option 19 * YOSHIFUJI Hideaki @USAGI: 20 * Fixed source address for MLD message based on 21 * <draft-ietf-magma-mld-source-05.txt>. 22 * YOSHIFUJI Hideaki @USAGI: 23 * - Ignore Queries for invalid addresses. 24 * - MLD for link-local addresses. 25 * David L Stevens <dlstevens@us.ibm.com>: 26 * - MLDv2 support 27 */ 28 29 #include <linux/module.h> 30 #include <linux/errno.h> 31 #include <linux/types.h> 32 #include <linux/string.h> 33 #include <linux/socket.h> 34 #include <linux/sockios.h> 35 #include <linux/jiffies.h> 36 #include <linux/times.h> 37 #include <linux/net.h> 38 #include <linux/in.h> 39 #include <linux/in6.h> 40 #include <linux/netdevice.h> 41 #include <linux/if_arp.h> 42 #include <linux/route.h> 43 #include <linux/init.h> 44 #include <linux/proc_fs.h> 45 #include <linux/seq_file.h> 46 #include <linux/slab.h> 47 #include <net/mld.h> 48 49 #include <linux/netfilter.h> 50 #include <linux/netfilter_ipv6.h> 51 52 #include <net/net_namespace.h> 53 #include <net/sock.h> 54 #include <net/snmp.h> 55 56 #include <net/ipv6.h> 57 #include <net/protocol.h> 58 #include <net/if_inet6.h> 59 #include <net/ndisc.h> 60 #include <net/addrconf.h> 61 #include <net/ip6_route.h> 62 #include <net/inet_common.h> 63 64 #include <net/ip6_checksum.h> 65 66 /* Set to 3 to get tracing... */ 67 #define MCAST_DEBUG 2 68 69 #if MCAST_DEBUG >= 3 70 #define MDBG(x) printk x 71 #else 72 #define MDBG(x) 73 #endif 74 75 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = { 77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4), 78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4), 79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4) 80 }; 81 82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 83 84 /* Big mc list lock for all the sockets */ 85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock); 86 87 static void igmp6_join_group(struct ifmcaddr6 *ma); 88 static void igmp6_leave_group(struct ifmcaddr6 *ma); 89 static void igmp6_timer_handler(unsigned long data); 90 91 static void mld_gq_timer_expire(unsigned long data); 92 static void mld_ifc_timer_expire(unsigned long data); 93 static void mld_ifc_event(struct inet6_dev *idev); 94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr); 96 static void mld_clear_delrec(struct inet6_dev *idev); 97 static int sf_setstate(struct ifmcaddr6 *pmc); 98 static void sf_markstate(struct ifmcaddr6 *pmc); 99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 101 int sfmode, int sfcount, const struct in6_addr *psfsrc, 102 int delta); 103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 104 int sfmode, int sfcount, const struct in6_addr *psfsrc, 105 int delta); 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 107 struct inet6_dev *idev); 108 109 110 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 111 #define MLD_QRV_DEFAULT 2 112 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \ 114 (idev)->cnf.force_mld_version == 1 || \ 115 ((idev)->mc_v1_seen && \ 116 time_before(jiffies, (idev)->mc_v1_seen))) 117 118 #define IPV6_MLD_MAX_MSF 64 119 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 121 122 /* 123 * socket join on multicast group 124 */ 125 126 #define for_each_pmc_rcu(np, pmc) \ 127 for (pmc = rcu_dereference(np->ipv6_mc_list); \ 128 pmc != NULL; \ 129 pmc = rcu_dereference(pmc->next)) 130 131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 132 { 133 struct net_device *dev = NULL; 134 struct ipv6_mc_socklist *mc_lst; 135 struct ipv6_pinfo *np = inet6_sk(sk); 136 struct net *net = sock_net(sk); 137 int err; 138 139 if (!ipv6_addr_is_multicast(addr)) 140 return -EINVAL; 141 142 rcu_read_lock(); 143 for_each_pmc_rcu(np, mc_lst) { 144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 145 ipv6_addr_equal(&mc_lst->addr, addr)) { 146 rcu_read_unlock(); 147 return -EADDRINUSE; 148 } 149 } 150 rcu_read_unlock(); 151 152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 153 154 if (mc_lst == NULL) 155 return -ENOMEM; 156 157 mc_lst->next = NULL; 158 mc_lst->addr = *addr; 159 160 rcu_read_lock(); 161 if (ifindex == 0) { 162 struct rt6_info *rt; 163 rt = rt6_lookup(net, addr, NULL, 0, 0); 164 if (rt) { 165 dev = rt->dst.dev; 166 ip6_rt_put(rt); 167 } 168 } else 169 dev = dev_get_by_index_rcu(net, ifindex); 170 171 if (dev == NULL) { 172 rcu_read_unlock(); 173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 174 return -ENODEV; 175 } 176 177 mc_lst->ifindex = dev->ifindex; 178 mc_lst->sfmode = MCAST_EXCLUDE; 179 rwlock_init(&mc_lst->sflock); 180 mc_lst->sflist = NULL; 181 182 /* 183 * now add/increase the group membership on the device 184 */ 185 186 err = ipv6_dev_mc_inc(dev, addr); 187 188 if (err) { 189 rcu_read_unlock(); 190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 191 return err; 192 } 193 194 spin_lock(&ipv6_sk_mc_lock); 195 mc_lst->next = np->ipv6_mc_list; 196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 197 spin_unlock(&ipv6_sk_mc_lock); 198 199 rcu_read_unlock(); 200 201 return 0; 202 } 203 204 /* 205 * socket leave on multicast group 206 */ 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 208 { 209 struct ipv6_pinfo *np = inet6_sk(sk); 210 struct ipv6_mc_socklist *mc_lst; 211 struct ipv6_mc_socklist __rcu **lnk; 212 struct net *net = sock_net(sk); 213 214 if (!ipv6_addr_is_multicast(addr)) 215 return -EINVAL; 216 217 spin_lock(&ipv6_sk_mc_lock); 218 for (lnk = &np->ipv6_mc_list; 219 (mc_lst = rcu_dereference_protected(*lnk, 220 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ; 221 lnk = &mc_lst->next) { 222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 223 ipv6_addr_equal(&mc_lst->addr, addr)) { 224 struct net_device *dev; 225 226 *lnk = mc_lst->next; 227 spin_unlock(&ipv6_sk_mc_lock); 228 229 rcu_read_lock(); 230 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 231 if (dev != NULL) { 232 struct inet6_dev *idev = __in6_dev_get(dev); 233 234 (void) ip6_mc_leave_src(sk, mc_lst, idev); 235 if (idev) 236 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 237 } else 238 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 239 rcu_read_unlock(); 240 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 241 kfree_rcu(mc_lst, rcu); 242 return 0; 243 } 244 } 245 spin_unlock(&ipv6_sk_mc_lock); 246 247 return -EADDRNOTAVAIL; 248 } 249 250 /* called with rcu_read_lock() */ 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, 252 const struct in6_addr *group, 253 int ifindex) 254 { 255 struct net_device *dev = NULL; 256 struct inet6_dev *idev = NULL; 257 258 if (ifindex == 0) { 259 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); 260 261 if (rt) { 262 dev = rt->dst.dev; 263 ip6_rt_put(rt); 264 } 265 } else 266 dev = dev_get_by_index_rcu(net, ifindex); 267 268 if (!dev) 269 return NULL; 270 idev = __in6_dev_get(dev); 271 if (!idev) 272 return NULL; 273 read_lock_bh(&idev->lock); 274 if (idev->dead) { 275 read_unlock_bh(&idev->lock); 276 return NULL; 277 } 278 return idev; 279 } 280 281 void ipv6_sock_mc_close(struct sock *sk) 282 { 283 struct ipv6_pinfo *np = inet6_sk(sk); 284 struct ipv6_mc_socklist *mc_lst; 285 struct net *net = sock_net(sk); 286 287 if (!rcu_access_pointer(np->ipv6_mc_list)) 288 return; 289 290 spin_lock(&ipv6_sk_mc_lock); 291 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list, 292 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) { 293 struct net_device *dev; 294 295 np->ipv6_mc_list = mc_lst->next; 296 spin_unlock(&ipv6_sk_mc_lock); 297 298 rcu_read_lock(); 299 dev = dev_get_by_index_rcu(net, mc_lst->ifindex); 300 if (dev) { 301 struct inet6_dev *idev = __in6_dev_get(dev); 302 303 (void) ip6_mc_leave_src(sk, mc_lst, idev); 304 if (idev) 305 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 306 } else 307 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 308 rcu_read_unlock(); 309 310 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 311 kfree_rcu(mc_lst, rcu); 312 313 spin_lock(&ipv6_sk_mc_lock); 314 } 315 spin_unlock(&ipv6_sk_mc_lock); 316 } 317 318 int ip6_mc_source(int add, int omode, struct sock *sk, 319 struct group_source_req *pgsr) 320 { 321 struct in6_addr *source, *group; 322 struct ipv6_mc_socklist *pmc; 323 struct inet6_dev *idev; 324 struct ipv6_pinfo *inet6 = inet6_sk(sk); 325 struct ip6_sf_socklist *psl; 326 struct net *net = sock_net(sk); 327 int i, j, rv; 328 int leavegroup = 0; 329 int pmclocked = 0; 330 int err; 331 332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 334 335 if (!ipv6_addr_is_multicast(group)) 336 return -EINVAL; 337 338 rcu_read_lock(); 339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); 340 if (!idev) { 341 rcu_read_unlock(); 342 return -ENODEV; 343 } 344 345 err = -EADDRNOTAVAIL; 346 347 for_each_pmc_rcu(inet6, pmc) { 348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 349 continue; 350 if (ipv6_addr_equal(&pmc->addr, group)) 351 break; 352 } 353 if (!pmc) { /* must have a prior join */ 354 err = -EINVAL; 355 goto done; 356 } 357 /* if a source filter was set, must be the same mode as before */ 358 if (pmc->sflist) { 359 if (pmc->sfmode != omode) { 360 err = -EINVAL; 361 goto done; 362 } 363 } else if (pmc->sfmode != omode) { 364 /* allow mode switches for empty-set filters */ 365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 367 pmc->sfmode = omode; 368 } 369 370 write_lock(&pmc->sflock); 371 pmclocked = 1; 372 373 psl = pmc->sflist; 374 if (!add) { 375 if (!psl) 376 goto done; /* err = -EADDRNOTAVAIL */ 377 rv = !0; 378 for (i=0; i<psl->sl_count; i++) { 379 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 380 if (rv == 0) 381 break; 382 } 383 if (rv) /* source not found */ 384 goto done; /* err = -EADDRNOTAVAIL */ 385 386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 388 leavegroup = 1; 389 goto done; 390 } 391 392 /* update the interface filter */ 393 ip6_mc_del_src(idev, group, omode, 1, source, 1); 394 395 for (j=i+1; j<psl->sl_count; j++) 396 psl->sl_addr[j-1] = psl->sl_addr[j]; 397 psl->sl_count--; 398 err = 0; 399 goto done; 400 } 401 /* else, add a new source to the filter */ 402 403 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 404 err = -ENOBUFS; 405 goto done; 406 } 407 if (!psl || psl->sl_count == psl->sl_max) { 408 struct ip6_sf_socklist *newpsl; 409 int count = IP6_SFBLOCK; 410 411 if (psl) 412 count += psl->sl_max; 413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 414 if (!newpsl) { 415 err = -ENOBUFS; 416 goto done; 417 } 418 newpsl->sl_max = count; 419 newpsl->sl_count = count - IP6_SFBLOCK; 420 if (psl) { 421 for (i=0; i<psl->sl_count; i++) 422 newpsl->sl_addr[i] = psl->sl_addr[i]; 423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 424 } 425 pmc->sflist = psl = newpsl; 426 } 427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 428 for (i=0; i<psl->sl_count; i++) { 429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 430 if (rv == 0) /* There is an error in the address. */ 431 goto done; 432 } 433 for (j=psl->sl_count-1; j>=i; j--) 434 psl->sl_addr[j+1] = psl->sl_addr[j]; 435 psl->sl_addr[i] = *source; 436 psl->sl_count++; 437 err = 0; 438 /* update the interface list */ 439 ip6_mc_add_src(idev, group, omode, 1, source, 1); 440 done: 441 if (pmclocked) 442 write_unlock(&pmc->sflock); 443 read_unlock_bh(&idev->lock); 444 rcu_read_unlock(); 445 if (leavegroup) 446 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 447 return err; 448 } 449 450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 451 { 452 const struct in6_addr *group; 453 struct ipv6_mc_socklist *pmc; 454 struct inet6_dev *idev; 455 struct ipv6_pinfo *inet6 = inet6_sk(sk); 456 struct ip6_sf_socklist *newpsl, *psl; 457 struct net *net = sock_net(sk); 458 int leavegroup = 0; 459 int i, err; 460 461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 462 463 if (!ipv6_addr_is_multicast(group)) 464 return -EINVAL; 465 if (gsf->gf_fmode != MCAST_INCLUDE && 466 gsf->gf_fmode != MCAST_EXCLUDE) 467 return -EINVAL; 468 469 rcu_read_lock(); 470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 471 472 if (!idev) { 473 rcu_read_unlock(); 474 return -ENODEV; 475 } 476 477 err = 0; 478 479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 480 leavegroup = 1; 481 goto done; 482 } 483 484 for_each_pmc_rcu(inet6, pmc) { 485 if (pmc->ifindex != gsf->gf_interface) 486 continue; 487 if (ipv6_addr_equal(&pmc->addr, group)) 488 break; 489 } 490 if (!pmc) { /* must have a prior join */ 491 err = -EINVAL; 492 goto done; 493 } 494 if (gsf->gf_numsrc) { 495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 496 GFP_ATOMIC); 497 if (!newpsl) { 498 err = -ENOBUFS; 499 goto done; 500 } 501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 502 for (i=0; i<newpsl->sl_count; ++i) { 503 struct sockaddr_in6 *psin6; 504 505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 506 newpsl->sl_addr[i] = psin6->sin6_addr; 507 } 508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 509 newpsl->sl_count, newpsl->sl_addr, 0); 510 if (err) { 511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 512 goto done; 513 } 514 } else { 515 newpsl = NULL; 516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 517 } 518 519 write_lock(&pmc->sflock); 520 psl = pmc->sflist; 521 if (psl) { 522 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 523 psl->sl_count, psl->sl_addr, 0); 524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 525 } else 526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 527 pmc->sflist = newpsl; 528 pmc->sfmode = gsf->gf_fmode; 529 write_unlock(&pmc->sflock); 530 err = 0; 531 done: 532 read_unlock_bh(&idev->lock); 533 rcu_read_unlock(); 534 if (leavegroup) 535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 536 return err; 537 } 538 539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 540 struct group_filter __user *optval, int __user *optlen) 541 { 542 int err, i, count, copycount; 543 const struct in6_addr *group; 544 struct ipv6_mc_socklist *pmc; 545 struct inet6_dev *idev; 546 struct ipv6_pinfo *inet6 = inet6_sk(sk); 547 struct ip6_sf_socklist *psl; 548 struct net *net = sock_net(sk); 549 550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 551 552 if (!ipv6_addr_is_multicast(group)) 553 return -EINVAL; 554 555 rcu_read_lock(); 556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); 557 558 if (!idev) { 559 rcu_read_unlock(); 560 return -ENODEV; 561 } 562 563 err = -EADDRNOTAVAIL; 564 /* 565 * changes to the ipv6_mc_list require the socket lock and 566 * a read lock on ip6_sk_mc_lock. We have the socket lock, 567 * so reading the list is safe. 568 */ 569 570 for_each_pmc_rcu(inet6, pmc) { 571 if (pmc->ifindex != gsf->gf_interface) 572 continue; 573 if (ipv6_addr_equal(group, &pmc->addr)) 574 break; 575 } 576 if (!pmc) /* must have a prior join */ 577 goto done; 578 gsf->gf_fmode = pmc->sfmode; 579 psl = pmc->sflist; 580 count = psl ? psl->sl_count : 0; 581 read_unlock_bh(&idev->lock); 582 rcu_read_unlock(); 583 584 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 585 gsf->gf_numsrc = count; 586 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 587 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 588 return -EFAULT; 589 } 590 /* changes to psl require the socket lock, a read lock on 591 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 592 * have the socket lock, so reading here is safe. 593 */ 594 for (i=0; i<copycount; i++) { 595 struct sockaddr_in6 *psin6; 596 struct sockaddr_storage ss; 597 598 psin6 = (struct sockaddr_in6 *)&ss; 599 memset(&ss, 0, sizeof(ss)); 600 psin6->sin6_family = AF_INET6; 601 psin6->sin6_addr = psl->sl_addr[i]; 602 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 603 return -EFAULT; 604 } 605 return 0; 606 done: 607 read_unlock_bh(&idev->lock); 608 rcu_read_unlock(); 609 return err; 610 } 611 612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 613 const struct in6_addr *src_addr) 614 { 615 struct ipv6_pinfo *np = inet6_sk(sk); 616 struct ipv6_mc_socklist *mc; 617 struct ip6_sf_socklist *psl; 618 bool rv = true; 619 620 rcu_read_lock(); 621 for_each_pmc_rcu(np, mc) { 622 if (ipv6_addr_equal(&mc->addr, mc_addr)) 623 break; 624 } 625 if (!mc) { 626 rcu_read_unlock(); 627 return true; 628 } 629 read_lock(&mc->sflock); 630 psl = mc->sflist; 631 if (!psl) { 632 rv = mc->sfmode == MCAST_EXCLUDE; 633 } else { 634 int i; 635 636 for (i=0; i<psl->sl_count; i++) { 637 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 638 break; 639 } 640 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 641 rv = false; 642 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 643 rv = false; 644 } 645 read_unlock(&mc->sflock); 646 rcu_read_unlock(); 647 648 return rv; 649 } 650 651 static void ma_put(struct ifmcaddr6 *mc) 652 { 653 if (atomic_dec_and_test(&mc->mca_refcnt)) { 654 in6_dev_put(mc->idev); 655 kfree(mc); 656 } 657 } 658 659 static void igmp6_group_added(struct ifmcaddr6 *mc) 660 { 661 struct net_device *dev = mc->idev->dev; 662 char buf[MAX_ADDR_LEN]; 663 664 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 665 IPV6_ADDR_SCOPE_LINKLOCAL) 666 return; 667 668 spin_lock_bh(&mc->mca_lock); 669 if (!(mc->mca_flags&MAF_LOADED)) { 670 mc->mca_flags |= MAF_LOADED; 671 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 672 dev_mc_add(dev, buf); 673 } 674 spin_unlock_bh(&mc->mca_lock); 675 676 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 677 return; 678 679 if (MLD_V1_SEEN(mc->idev)) { 680 igmp6_join_group(mc); 681 return; 682 } 683 /* else v2 */ 684 685 mc->mca_crcount = mc->idev->mc_qrv; 686 mld_ifc_event(mc->idev); 687 } 688 689 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 690 { 691 struct net_device *dev = mc->idev->dev; 692 char buf[MAX_ADDR_LEN]; 693 694 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 695 IPV6_ADDR_SCOPE_LINKLOCAL) 696 return; 697 698 spin_lock_bh(&mc->mca_lock); 699 if (mc->mca_flags&MAF_LOADED) { 700 mc->mca_flags &= ~MAF_LOADED; 701 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 702 dev_mc_del(dev, buf); 703 } 704 705 if (mc->mca_flags & MAF_NOREPORT) 706 goto done; 707 spin_unlock_bh(&mc->mca_lock); 708 709 if (!mc->idev->dead) 710 igmp6_leave_group(mc); 711 712 spin_lock_bh(&mc->mca_lock); 713 if (del_timer(&mc->mca_timer)) 714 atomic_dec(&mc->mca_refcnt); 715 done: 716 ip6_mc_clear_src(mc); 717 spin_unlock_bh(&mc->mca_lock); 718 } 719 720 /* 721 * deleted ifmcaddr6 manipulation 722 */ 723 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 724 { 725 struct ifmcaddr6 *pmc; 726 727 /* this is an "ifmcaddr6" for convenience; only the fields below 728 * are actually used. In particular, the refcnt and users are not 729 * used for management of the delete list. Using the same structure 730 * for deleted items allows change reports to use common code with 731 * non-deleted or query-response MCA's. 732 */ 733 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 734 if (!pmc) 735 return; 736 737 spin_lock_bh(&im->mca_lock); 738 spin_lock_init(&pmc->mca_lock); 739 pmc->idev = im->idev; 740 in6_dev_hold(idev); 741 pmc->mca_addr = im->mca_addr; 742 pmc->mca_crcount = idev->mc_qrv; 743 pmc->mca_sfmode = im->mca_sfmode; 744 if (pmc->mca_sfmode == MCAST_INCLUDE) { 745 struct ip6_sf_list *psf; 746 747 pmc->mca_tomb = im->mca_tomb; 748 pmc->mca_sources = im->mca_sources; 749 im->mca_tomb = im->mca_sources = NULL; 750 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 751 psf->sf_crcount = pmc->mca_crcount; 752 } 753 spin_unlock_bh(&im->mca_lock); 754 755 spin_lock_bh(&idev->mc_lock); 756 pmc->next = idev->mc_tomb; 757 idev->mc_tomb = pmc; 758 spin_unlock_bh(&idev->mc_lock); 759 } 760 761 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca) 762 { 763 struct ifmcaddr6 *pmc, *pmc_prev; 764 struct ip6_sf_list *psf, *psf_next; 765 766 spin_lock_bh(&idev->mc_lock); 767 pmc_prev = NULL; 768 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 769 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 770 break; 771 pmc_prev = pmc; 772 } 773 if (pmc) { 774 if (pmc_prev) 775 pmc_prev->next = pmc->next; 776 else 777 idev->mc_tomb = pmc->next; 778 } 779 spin_unlock_bh(&idev->mc_lock); 780 781 if (pmc) { 782 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 783 psf_next = psf->sf_next; 784 kfree(psf); 785 } 786 in6_dev_put(pmc->idev); 787 kfree(pmc); 788 } 789 } 790 791 static void mld_clear_delrec(struct inet6_dev *idev) 792 { 793 struct ifmcaddr6 *pmc, *nextpmc; 794 795 spin_lock_bh(&idev->mc_lock); 796 pmc = idev->mc_tomb; 797 idev->mc_tomb = NULL; 798 spin_unlock_bh(&idev->mc_lock); 799 800 for (; pmc; pmc = nextpmc) { 801 nextpmc = pmc->next; 802 ip6_mc_clear_src(pmc); 803 in6_dev_put(pmc->idev); 804 kfree(pmc); 805 } 806 807 /* clear dead sources, too */ 808 read_lock_bh(&idev->lock); 809 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 810 struct ip6_sf_list *psf, *psf_next; 811 812 spin_lock_bh(&pmc->mca_lock); 813 psf = pmc->mca_tomb; 814 pmc->mca_tomb = NULL; 815 spin_unlock_bh(&pmc->mca_lock); 816 for (; psf; psf=psf_next) { 817 psf_next = psf->sf_next; 818 kfree(psf); 819 } 820 } 821 read_unlock_bh(&idev->lock); 822 } 823 824 825 /* 826 * device multicast group inc (add if not found) 827 */ 828 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 829 { 830 struct ifmcaddr6 *mc; 831 struct inet6_dev *idev; 832 833 /* we need to take a reference on idev */ 834 idev = in6_dev_get(dev); 835 836 if (idev == NULL) 837 return -EINVAL; 838 839 write_lock_bh(&idev->lock); 840 if (idev->dead) { 841 write_unlock_bh(&idev->lock); 842 in6_dev_put(idev); 843 return -ENODEV; 844 } 845 846 for (mc = idev->mc_list; mc; mc = mc->next) { 847 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 848 mc->mca_users++; 849 write_unlock_bh(&idev->lock); 850 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 851 NULL, 0); 852 in6_dev_put(idev); 853 return 0; 854 } 855 } 856 857 /* 858 * not found: create a new one. 859 */ 860 861 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 862 863 if (mc == NULL) { 864 write_unlock_bh(&idev->lock); 865 in6_dev_put(idev); 866 return -ENOMEM; 867 } 868 869 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 870 871 mc->mca_addr = *addr; 872 mc->idev = idev; /* (reference taken) */ 873 mc->mca_users = 1; 874 /* mca_stamp should be updated upon changes */ 875 mc->mca_cstamp = mc->mca_tstamp = jiffies; 876 atomic_set(&mc->mca_refcnt, 2); 877 spin_lock_init(&mc->mca_lock); 878 879 /* initial mode is (EX, empty) */ 880 mc->mca_sfmode = MCAST_EXCLUDE; 881 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 882 883 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 884 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 885 mc->mca_flags |= MAF_NOREPORT; 886 887 mc->next = idev->mc_list; 888 idev->mc_list = mc; 889 write_unlock_bh(&idev->lock); 890 891 mld_del_delrec(idev, &mc->mca_addr); 892 igmp6_group_added(mc); 893 ma_put(mc); 894 return 0; 895 } 896 897 /* 898 * device multicast group del 899 */ 900 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 901 { 902 struct ifmcaddr6 *ma, **map; 903 904 write_lock_bh(&idev->lock); 905 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 906 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 907 if (--ma->mca_users == 0) { 908 *map = ma->next; 909 write_unlock_bh(&idev->lock); 910 911 igmp6_group_dropped(ma); 912 913 ma_put(ma); 914 return 0; 915 } 916 write_unlock_bh(&idev->lock); 917 return 0; 918 } 919 } 920 write_unlock_bh(&idev->lock); 921 922 return -ENOENT; 923 } 924 925 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 926 { 927 struct inet6_dev *idev; 928 int err; 929 930 rcu_read_lock(); 931 932 idev = __in6_dev_get(dev); 933 if (!idev) 934 err = -ENODEV; 935 else 936 err = __ipv6_dev_mc_dec(idev, addr); 937 938 rcu_read_unlock(); 939 return err; 940 } 941 942 /* 943 * check if the interface/address pair is valid 944 */ 945 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 946 const struct in6_addr *src_addr) 947 { 948 struct inet6_dev *idev; 949 struct ifmcaddr6 *mc; 950 bool rv = false; 951 952 rcu_read_lock(); 953 idev = __in6_dev_get(dev); 954 if (idev) { 955 read_lock_bh(&idev->lock); 956 for (mc = idev->mc_list; mc; mc=mc->next) { 957 if (ipv6_addr_equal(&mc->mca_addr, group)) 958 break; 959 } 960 if (mc) { 961 if (src_addr && !ipv6_addr_any(src_addr)) { 962 struct ip6_sf_list *psf; 963 964 spin_lock_bh(&mc->mca_lock); 965 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 966 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 967 break; 968 } 969 if (psf) 970 rv = psf->sf_count[MCAST_INCLUDE] || 971 psf->sf_count[MCAST_EXCLUDE] != 972 mc->mca_sfcount[MCAST_EXCLUDE]; 973 else 974 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 975 spin_unlock_bh(&mc->mca_lock); 976 } else 977 rv = true; /* don't filter unspecified source */ 978 } 979 read_unlock_bh(&idev->lock); 980 } 981 rcu_read_unlock(); 982 return rv; 983 } 984 985 static void mld_gq_start_timer(struct inet6_dev *idev) 986 { 987 int tv = net_random() % idev->mc_maxdelay; 988 989 idev->mc_gq_running = 1; 990 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 991 in6_dev_hold(idev); 992 } 993 994 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 995 { 996 int tv = net_random() % delay; 997 998 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 999 in6_dev_hold(idev); 1000 } 1001 1002 static void mld_dad_start_timer(struct inet6_dev *idev, int delay) 1003 { 1004 int tv = net_random() % delay; 1005 1006 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) 1007 in6_dev_hold(idev); 1008 } 1009 1010 /* 1011 * IGMP handling (alias multicast ICMPv6 messages) 1012 */ 1013 1014 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1015 { 1016 unsigned long delay = resptime; 1017 1018 /* Do not start timer for these addresses */ 1019 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1020 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1021 return; 1022 1023 if (del_timer(&ma->mca_timer)) { 1024 atomic_dec(&ma->mca_refcnt); 1025 delay = ma->mca_timer.expires - jiffies; 1026 } 1027 1028 if (delay >= resptime) { 1029 if (resptime) 1030 delay = net_random() % resptime; 1031 else 1032 delay = 1; 1033 } 1034 ma->mca_timer.expires = jiffies + delay; 1035 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1036 atomic_inc(&ma->mca_refcnt); 1037 ma->mca_flags |= MAF_TIMER_RUNNING; 1038 } 1039 1040 /* mark EXCLUDE-mode sources */ 1041 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1042 const struct in6_addr *srcs) 1043 { 1044 struct ip6_sf_list *psf; 1045 int i, scount; 1046 1047 scount = 0; 1048 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1049 if (scount == nsrcs) 1050 break; 1051 for (i=0; i<nsrcs; i++) { 1052 /* skip inactive filters */ 1053 if (psf->sf_count[MCAST_INCLUDE] || 1054 pmc->mca_sfcount[MCAST_EXCLUDE] != 1055 psf->sf_count[MCAST_EXCLUDE]) 1056 break; 1057 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1058 scount++; 1059 break; 1060 } 1061 } 1062 } 1063 pmc->mca_flags &= ~MAF_GSQUERY; 1064 if (scount == nsrcs) /* all sources excluded */ 1065 return false; 1066 return true; 1067 } 1068 1069 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1070 const struct in6_addr *srcs) 1071 { 1072 struct ip6_sf_list *psf; 1073 int i, scount; 1074 1075 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1076 return mld_xmarksources(pmc, nsrcs, srcs); 1077 1078 /* mark INCLUDE-mode sources */ 1079 1080 scount = 0; 1081 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1082 if (scount == nsrcs) 1083 break; 1084 for (i=0; i<nsrcs; i++) { 1085 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1086 psf->sf_gsresp = 1; 1087 scount++; 1088 break; 1089 } 1090 } 1091 } 1092 if (!scount) { 1093 pmc->mca_flags &= ~MAF_GSQUERY; 1094 return false; 1095 } 1096 pmc->mca_flags |= MAF_GSQUERY; 1097 return true; 1098 } 1099 1100 /* called with rcu_read_lock() */ 1101 int igmp6_event_query(struct sk_buff *skb) 1102 { 1103 struct mld2_query *mlh2 = NULL; 1104 struct ifmcaddr6 *ma; 1105 const struct in6_addr *group; 1106 unsigned long max_delay; 1107 struct inet6_dev *idev; 1108 struct mld_msg *mld; 1109 int group_type; 1110 int mark = 0; 1111 int len; 1112 1113 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1114 return -EINVAL; 1115 1116 /* compute payload length excluding extension headers */ 1117 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1118 len -= skb_network_header_len(skb); 1119 1120 /* Drop queries with not link local source */ 1121 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1122 return -EINVAL; 1123 1124 idev = __in6_dev_get(skb->dev); 1125 1126 if (idev == NULL) 1127 return 0; 1128 1129 mld = (struct mld_msg *)icmp6_hdr(skb); 1130 group = &mld->mld_mca; 1131 group_type = ipv6_addr_type(group); 1132 1133 if (group_type != IPV6_ADDR_ANY && 1134 !(group_type&IPV6_ADDR_MULTICAST)) 1135 return -EINVAL; 1136 1137 if (len == 24) { 1138 int switchback; 1139 /* MLDv1 router present */ 1140 1141 /* Translate milliseconds to jiffies */ 1142 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000; 1143 1144 switchback = (idev->mc_qrv + 1) * max_delay; 1145 idev->mc_v1_seen = jiffies + switchback; 1146 1147 /* cancel the interface change timer */ 1148 idev->mc_ifc_count = 0; 1149 if (del_timer(&idev->mc_ifc_timer)) 1150 __in6_dev_put(idev); 1151 /* clear deleted report items */ 1152 mld_clear_delrec(idev); 1153 } else if (len >= 28) { 1154 int srcs_offset = sizeof(struct mld2_query) - 1155 sizeof(struct icmp6hdr); 1156 if (!pskb_may_pull(skb, srcs_offset)) 1157 return -EINVAL; 1158 1159 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1160 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000; 1161 if (!max_delay) 1162 max_delay = 1; 1163 idev->mc_maxdelay = max_delay; 1164 if (mlh2->mld2q_qrv) 1165 idev->mc_qrv = mlh2->mld2q_qrv; 1166 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1167 if (mlh2->mld2q_nsrcs) 1168 return -EINVAL; /* no sources allowed */ 1169 1170 mld_gq_start_timer(idev); 1171 return 0; 1172 } 1173 /* mark sources to include, if group & source-specific */ 1174 if (mlh2->mld2q_nsrcs != 0) { 1175 if (!pskb_may_pull(skb, srcs_offset + 1176 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1177 return -EINVAL; 1178 1179 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1180 mark = 1; 1181 } 1182 } else 1183 return -EINVAL; 1184 1185 read_lock_bh(&idev->lock); 1186 if (group_type == IPV6_ADDR_ANY) { 1187 for (ma = idev->mc_list; ma; ma=ma->next) { 1188 spin_lock_bh(&ma->mca_lock); 1189 igmp6_group_queried(ma, max_delay); 1190 spin_unlock_bh(&ma->mca_lock); 1191 } 1192 } else { 1193 for (ma = idev->mc_list; ma; ma=ma->next) { 1194 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1195 continue; 1196 spin_lock_bh(&ma->mca_lock); 1197 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1198 /* gsquery <- gsquery && mark */ 1199 if (!mark) 1200 ma->mca_flags &= ~MAF_GSQUERY; 1201 } else { 1202 /* gsquery <- mark */ 1203 if (mark) 1204 ma->mca_flags |= MAF_GSQUERY; 1205 else 1206 ma->mca_flags &= ~MAF_GSQUERY; 1207 } 1208 if (!(ma->mca_flags & MAF_GSQUERY) || 1209 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1210 igmp6_group_queried(ma, max_delay); 1211 spin_unlock_bh(&ma->mca_lock); 1212 break; 1213 } 1214 } 1215 read_unlock_bh(&idev->lock); 1216 1217 return 0; 1218 } 1219 1220 /* called with rcu_read_lock() */ 1221 int igmp6_event_report(struct sk_buff *skb) 1222 { 1223 struct ifmcaddr6 *ma; 1224 struct inet6_dev *idev; 1225 struct mld_msg *mld; 1226 int addr_type; 1227 1228 /* Our own report looped back. Ignore it. */ 1229 if (skb->pkt_type == PACKET_LOOPBACK) 1230 return 0; 1231 1232 /* send our report if the MC router may not have heard this report */ 1233 if (skb->pkt_type != PACKET_MULTICAST && 1234 skb->pkt_type != PACKET_BROADCAST) 1235 return 0; 1236 1237 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1238 return -EINVAL; 1239 1240 mld = (struct mld_msg *)icmp6_hdr(skb); 1241 1242 /* Drop reports with not link local source */ 1243 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1244 if (addr_type != IPV6_ADDR_ANY && 1245 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1246 return -EINVAL; 1247 1248 idev = __in6_dev_get(skb->dev); 1249 if (idev == NULL) 1250 return -ENODEV; 1251 1252 /* 1253 * Cancel the timer for this group 1254 */ 1255 1256 read_lock_bh(&idev->lock); 1257 for (ma = idev->mc_list; ma; ma=ma->next) { 1258 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1259 spin_lock(&ma->mca_lock); 1260 if (del_timer(&ma->mca_timer)) 1261 atomic_dec(&ma->mca_refcnt); 1262 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1263 spin_unlock(&ma->mca_lock); 1264 break; 1265 } 1266 } 1267 read_unlock_bh(&idev->lock); 1268 return 0; 1269 } 1270 1271 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1272 int gdeleted, int sdeleted) 1273 { 1274 switch (type) { 1275 case MLD2_MODE_IS_INCLUDE: 1276 case MLD2_MODE_IS_EXCLUDE: 1277 if (gdeleted || sdeleted) 1278 return false; 1279 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1280 if (pmc->mca_sfmode == MCAST_INCLUDE) 1281 return true; 1282 /* don't include if this source is excluded 1283 * in all filters 1284 */ 1285 if (psf->sf_count[MCAST_INCLUDE]) 1286 return type == MLD2_MODE_IS_INCLUDE; 1287 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1288 psf->sf_count[MCAST_EXCLUDE]; 1289 } 1290 return false; 1291 case MLD2_CHANGE_TO_INCLUDE: 1292 if (gdeleted || sdeleted) 1293 return false; 1294 return psf->sf_count[MCAST_INCLUDE] != 0; 1295 case MLD2_CHANGE_TO_EXCLUDE: 1296 if (gdeleted || sdeleted) 1297 return false; 1298 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1299 psf->sf_count[MCAST_INCLUDE]) 1300 return false; 1301 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1302 psf->sf_count[MCAST_EXCLUDE]; 1303 case MLD2_ALLOW_NEW_SOURCES: 1304 if (gdeleted || !psf->sf_crcount) 1305 return false; 1306 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1307 case MLD2_BLOCK_OLD_SOURCES: 1308 if (pmc->mca_sfmode == MCAST_INCLUDE) 1309 return gdeleted || (psf->sf_crcount && sdeleted); 1310 return psf->sf_crcount && !gdeleted && !sdeleted; 1311 } 1312 return false; 1313 } 1314 1315 static int 1316 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1317 { 1318 struct ip6_sf_list *psf; 1319 int scount = 0; 1320 1321 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1322 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1323 continue; 1324 scount++; 1325 } 1326 return scount; 1327 } 1328 1329 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1330 struct net_device *dev, 1331 const struct in6_addr *saddr, 1332 const struct in6_addr *daddr, 1333 int proto, int len) 1334 { 1335 struct ipv6hdr *hdr; 1336 1337 skb->protocol = htons(ETH_P_IPV6); 1338 skb->dev = dev; 1339 1340 skb_reset_network_header(skb); 1341 skb_put(skb, sizeof(struct ipv6hdr)); 1342 hdr = ipv6_hdr(skb); 1343 1344 ip6_flow_hdr(hdr, 0, 0); 1345 1346 hdr->payload_len = htons(len); 1347 hdr->nexthdr = proto; 1348 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1349 1350 hdr->saddr = *saddr; 1351 hdr->daddr = *daddr; 1352 } 1353 1354 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size) 1355 { 1356 struct net_device *dev = idev->dev; 1357 struct net *net = dev_net(dev); 1358 struct sock *sk = net->ipv6.igmp_sk; 1359 struct sk_buff *skb; 1360 struct mld2_report *pmr; 1361 struct in6_addr addr_buf; 1362 const struct in6_addr *saddr; 1363 int hlen = LL_RESERVED_SPACE(dev); 1364 int tlen = dev->needed_tailroom; 1365 int err; 1366 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1367 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1368 IPV6_TLV_PADN, 0 }; 1369 1370 /* we assume size > sizeof(ra) here */ 1371 size += hlen + tlen; 1372 /* limit our allocations to order-0 page */ 1373 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1374 skb = sock_alloc_send_skb(sk, size, 1, &err); 1375 1376 if (!skb) 1377 return NULL; 1378 1379 skb_reserve(skb, hlen); 1380 1381 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1382 /* <draft-ietf-magma-mld-source-05.txt>: 1383 * use unspecified address as the source address 1384 * when a valid link-local address is not available. 1385 */ 1386 saddr = &in6addr_any; 1387 } else 1388 saddr = &addr_buf; 1389 1390 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1391 1392 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1393 1394 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1395 skb_put(skb, sizeof(*pmr)); 1396 pmr = (struct mld2_report *)skb_transport_header(skb); 1397 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1398 pmr->mld2r_resv1 = 0; 1399 pmr->mld2r_cksum = 0; 1400 pmr->mld2r_resv2 = 0; 1401 pmr->mld2r_ngrec = 0; 1402 return skb; 1403 } 1404 1405 static void mld_sendpack(struct sk_buff *skb) 1406 { 1407 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1408 struct mld2_report *pmr = 1409 (struct mld2_report *)skb_transport_header(skb); 1410 int payload_len, mldlen; 1411 struct inet6_dev *idev; 1412 struct net *net = dev_net(skb->dev); 1413 int err; 1414 struct flowi6 fl6; 1415 struct dst_entry *dst; 1416 1417 rcu_read_lock(); 1418 idev = __in6_dev_get(skb->dev); 1419 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1420 1421 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1422 sizeof(*pip6); 1423 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1424 pip6->payload_len = htons(payload_len); 1425 1426 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1427 IPPROTO_ICMPV6, 1428 csum_partial(skb_transport_header(skb), 1429 mldlen, 0)); 1430 1431 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1432 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1433 skb->dev->ifindex); 1434 dst = icmp6_dst_alloc(skb->dev, &fl6); 1435 1436 err = 0; 1437 if (IS_ERR(dst)) { 1438 err = PTR_ERR(dst); 1439 dst = NULL; 1440 } 1441 skb_dst_set(skb, dst); 1442 if (err) 1443 goto err_out; 1444 1445 payload_len = skb->len; 1446 1447 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1448 dst_output); 1449 out: 1450 if (!err) { 1451 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1452 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1453 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1454 } else 1455 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1456 1457 rcu_read_unlock(); 1458 return; 1459 1460 err_out: 1461 kfree_skb(skb); 1462 goto out; 1463 } 1464 1465 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1466 { 1467 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1468 } 1469 1470 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1471 int type, struct mld2_grec **ppgr) 1472 { 1473 struct net_device *dev = pmc->idev->dev; 1474 struct mld2_report *pmr; 1475 struct mld2_grec *pgr; 1476 1477 if (!skb) 1478 skb = mld_newpack(pmc->idev, dev->mtu); 1479 if (!skb) 1480 return NULL; 1481 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1482 pgr->grec_type = type; 1483 pgr->grec_auxwords = 0; 1484 pgr->grec_nsrcs = 0; 1485 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1486 pmr = (struct mld2_report *)skb_transport_header(skb); 1487 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1488 *ppgr = pgr; 1489 return skb; 1490 } 1491 1492 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1493 skb_tailroom(skb)) : 0) 1494 1495 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1496 int type, int gdeleted, int sdeleted) 1497 { 1498 struct inet6_dev *idev = pmc->idev; 1499 struct net_device *dev = idev->dev; 1500 struct mld2_report *pmr; 1501 struct mld2_grec *pgr = NULL; 1502 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1503 int scount, stotal, first, isquery, truncate; 1504 1505 if (pmc->mca_flags & MAF_NOREPORT) 1506 return skb; 1507 1508 isquery = type == MLD2_MODE_IS_INCLUDE || 1509 type == MLD2_MODE_IS_EXCLUDE; 1510 truncate = type == MLD2_MODE_IS_EXCLUDE || 1511 type == MLD2_CHANGE_TO_EXCLUDE; 1512 1513 stotal = scount = 0; 1514 1515 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1516 1517 if (!*psf_list) 1518 goto empty_source; 1519 1520 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1521 1522 /* EX and TO_EX get a fresh packet, if needed */ 1523 if (truncate) { 1524 if (pmr && pmr->mld2r_ngrec && 1525 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1526 if (skb) 1527 mld_sendpack(skb); 1528 skb = mld_newpack(idev, dev->mtu); 1529 } 1530 } 1531 first = 1; 1532 psf_prev = NULL; 1533 for (psf=*psf_list; psf; psf=psf_next) { 1534 struct in6_addr *psrc; 1535 1536 psf_next = psf->sf_next; 1537 1538 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1539 psf_prev = psf; 1540 continue; 1541 } 1542 1543 /* clear marks on query responses */ 1544 if (isquery) 1545 psf->sf_gsresp = 0; 1546 1547 if (AVAILABLE(skb) < sizeof(*psrc) + 1548 first*sizeof(struct mld2_grec)) { 1549 if (truncate && !first) 1550 break; /* truncate these */ 1551 if (pgr) 1552 pgr->grec_nsrcs = htons(scount); 1553 if (skb) 1554 mld_sendpack(skb); 1555 skb = mld_newpack(idev, dev->mtu); 1556 first = 1; 1557 scount = 0; 1558 } 1559 if (first) { 1560 skb = add_grhead(skb, pmc, type, &pgr); 1561 first = 0; 1562 } 1563 if (!skb) 1564 return NULL; 1565 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1566 *psrc = psf->sf_addr; 1567 scount++; stotal++; 1568 if ((type == MLD2_ALLOW_NEW_SOURCES || 1569 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1570 psf->sf_crcount--; 1571 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1572 if (psf_prev) 1573 psf_prev->sf_next = psf->sf_next; 1574 else 1575 *psf_list = psf->sf_next; 1576 kfree(psf); 1577 continue; 1578 } 1579 } 1580 psf_prev = psf; 1581 } 1582 1583 empty_source: 1584 if (!stotal) { 1585 if (type == MLD2_ALLOW_NEW_SOURCES || 1586 type == MLD2_BLOCK_OLD_SOURCES) 1587 return skb; 1588 if (pmc->mca_crcount || isquery) { 1589 /* make sure we have room for group header */ 1590 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1591 mld_sendpack(skb); 1592 skb = NULL; /* add_grhead will get a new one */ 1593 } 1594 skb = add_grhead(skb, pmc, type, &pgr); 1595 } 1596 } 1597 if (pgr) 1598 pgr->grec_nsrcs = htons(scount); 1599 1600 if (isquery) 1601 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1602 return skb; 1603 } 1604 1605 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1606 { 1607 struct sk_buff *skb = NULL; 1608 int type; 1609 1610 read_lock_bh(&idev->lock); 1611 if (!pmc) { 1612 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1613 if (pmc->mca_flags & MAF_NOREPORT) 1614 continue; 1615 spin_lock_bh(&pmc->mca_lock); 1616 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1617 type = MLD2_MODE_IS_EXCLUDE; 1618 else 1619 type = MLD2_MODE_IS_INCLUDE; 1620 skb = add_grec(skb, pmc, type, 0, 0); 1621 spin_unlock_bh(&pmc->mca_lock); 1622 } 1623 } else { 1624 spin_lock_bh(&pmc->mca_lock); 1625 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1626 type = MLD2_MODE_IS_EXCLUDE; 1627 else 1628 type = MLD2_MODE_IS_INCLUDE; 1629 skb = add_grec(skb, pmc, type, 0, 0); 1630 spin_unlock_bh(&pmc->mca_lock); 1631 } 1632 read_unlock_bh(&idev->lock); 1633 if (skb) 1634 mld_sendpack(skb); 1635 } 1636 1637 /* 1638 * remove zero-count source records from a source filter list 1639 */ 1640 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1641 { 1642 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1643 1644 psf_prev = NULL; 1645 for (psf=*ppsf; psf; psf = psf_next) { 1646 psf_next = psf->sf_next; 1647 if (psf->sf_crcount == 0) { 1648 if (psf_prev) 1649 psf_prev->sf_next = psf->sf_next; 1650 else 1651 *ppsf = psf->sf_next; 1652 kfree(psf); 1653 } else 1654 psf_prev = psf; 1655 } 1656 } 1657 1658 static void mld_send_cr(struct inet6_dev *idev) 1659 { 1660 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1661 struct sk_buff *skb = NULL; 1662 int type, dtype; 1663 1664 read_lock_bh(&idev->lock); 1665 spin_lock(&idev->mc_lock); 1666 1667 /* deleted MCA's */ 1668 pmc_prev = NULL; 1669 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1670 pmc_next = pmc->next; 1671 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1672 type = MLD2_BLOCK_OLD_SOURCES; 1673 dtype = MLD2_BLOCK_OLD_SOURCES; 1674 skb = add_grec(skb, pmc, type, 1, 0); 1675 skb = add_grec(skb, pmc, dtype, 1, 1); 1676 } 1677 if (pmc->mca_crcount) { 1678 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1679 type = MLD2_CHANGE_TO_INCLUDE; 1680 skb = add_grec(skb, pmc, type, 1, 0); 1681 } 1682 pmc->mca_crcount--; 1683 if (pmc->mca_crcount == 0) { 1684 mld_clear_zeros(&pmc->mca_tomb); 1685 mld_clear_zeros(&pmc->mca_sources); 1686 } 1687 } 1688 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1689 !pmc->mca_sources) { 1690 if (pmc_prev) 1691 pmc_prev->next = pmc_next; 1692 else 1693 idev->mc_tomb = pmc_next; 1694 in6_dev_put(pmc->idev); 1695 kfree(pmc); 1696 } else 1697 pmc_prev = pmc; 1698 } 1699 spin_unlock(&idev->mc_lock); 1700 1701 /* change recs */ 1702 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1703 spin_lock_bh(&pmc->mca_lock); 1704 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1705 type = MLD2_BLOCK_OLD_SOURCES; 1706 dtype = MLD2_ALLOW_NEW_SOURCES; 1707 } else { 1708 type = MLD2_ALLOW_NEW_SOURCES; 1709 dtype = MLD2_BLOCK_OLD_SOURCES; 1710 } 1711 skb = add_grec(skb, pmc, type, 0, 0); 1712 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1713 1714 /* filter mode changes */ 1715 if (pmc->mca_crcount) { 1716 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1717 type = MLD2_CHANGE_TO_EXCLUDE; 1718 else 1719 type = MLD2_CHANGE_TO_INCLUDE; 1720 skb = add_grec(skb, pmc, type, 0, 0); 1721 pmc->mca_crcount--; 1722 } 1723 spin_unlock_bh(&pmc->mca_lock); 1724 } 1725 read_unlock_bh(&idev->lock); 1726 if (!skb) 1727 return; 1728 (void) mld_sendpack(skb); 1729 } 1730 1731 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1732 { 1733 struct net *net = dev_net(dev); 1734 struct sock *sk = net->ipv6.igmp_sk; 1735 struct inet6_dev *idev; 1736 struct sk_buff *skb; 1737 struct mld_msg *hdr; 1738 const struct in6_addr *snd_addr, *saddr; 1739 struct in6_addr addr_buf; 1740 int hlen = LL_RESERVED_SPACE(dev); 1741 int tlen = dev->needed_tailroom; 1742 int err, len, payload_len, full_len; 1743 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1744 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1745 IPV6_TLV_PADN, 0 }; 1746 struct flowi6 fl6; 1747 struct dst_entry *dst; 1748 1749 if (type == ICMPV6_MGM_REDUCTION) 1750 snd_addr = &in6addr_linklocal_allrouters; 1751 else 1752 snd_addr = addr; 1753 1754 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1755 payload_len = len + sizeof(ra); 1756 full_len = sizeof(struct ipv6hdr) + payload_len; 1757 1758 rcu_read_lock(); 1759 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1760 IPSTATS_MIB_OUT, full_len); 1761 rcu_read_unlock(); 1762 1763 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 1764 1765 if (skb == NULL) { 1766 rcu_read_lock(); 1767 IP6_INC_STATS(net, __in6_dev_get(dev), 1768 IPSTATS_MIB_OUTDISCARDS); 1769 rcu_read_unlock(); 1770 return; 1771 } 1772 1773 skb_reserve(skb, hlen); 1774 1775 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1776 /* <draft-ietf-magma-mld-source-05.txt>: 1777 * use unspecified address as the source address 1778 * when a valid link-local address is not available. 1779 */ 1780 saddr = &in6addr_any; 1781 } else 1782 saddr = &addr_buf; 1783 1784 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1785 1786 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1787 1788 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1789 memset(hdr, 0, sizeof(struct mld_msg)); 1790 hdr->mld_type = type; 1791 hdr->mld_mca = *addr; 1792 1793 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1794 IPPROTO_ICMPV6, 1795 csum_partial(hdr, len, 0)); 1796 1797 rcu_read_lock(); 1798 idev = __in6_dev_get(skb->dev); 1799 1800 icmpv6_flow_init(sk, &fl6, type, 1801 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1802 skb->dev->ifindex); 1803 dst = icmp6_dst_alloc(skb->dev, &fl6); 1804 if (IS_ERR(dst)) { 1805 err = PTR_ERR(dst); 1806 goto err_out; 1807 } 1808 1809 skb_dst_set(skb, dst); 1810 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1811 dst_output); 1812 out: 1813 if (!err) { 1814 ICMP6MSGOUT_INC_STATS(net, idev, type); 1815 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1816 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1817 } else 1818 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1819 1820 rcu_read_unlock(); 1821 return; 1822 1823 err_out: 1824 kfree_skb(skb); 1825 goto out; 1826 } 1827 1828 static void mld_resend_report(struct inet6_dev *idev) 1829 { 1830 if (MLD_V1_SEEN(idev)) { 1831 struct ifmcaddr6 *mcaddr; 1832 read_lock_bh(&idev->lock); 1833 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) { 1834 if (!(mcaddr->mca_flags & MAF_NOREPORT)) 1835 igmp6_send(&mcaddr->mca_addr, idev->dev, 1836 ICMPV6_MGM_REPORT); 1837 } 1838 read_unlock_bh(&idev->lock); 1839 } else { 1840 mld_send_report(idev, NULL); 1841 } 1842 } 1843 1844 void ipv6_mc_dad_complete(struct inet6_dev *idev) 1845 { 1846 idev->mc_dad_count = idev->mc_qrv; 1847 if (idev->mc_dad_count) { 1848 mld_resend_report(idev); 1849 idev->mc_dad_count--; 1850 if (idev->mc_dad_count) 1851 mld_dad_start_timer(idev, idev->mc_maxdelay); 1852 } 1853 } 1854 1855 static void mld_dad_timer_expire(unsigned long data) 1856 { 1857 struct inet6_dev *idev = (struct inet6_dev *)data; 1858 1859 mld_resend_report(idev); 1860 if (idev->mc_dad_count) { 1861 idev->mc_dad_count--; 1862 if (idev->mc_dad_count) 1863 mld_dad_start_timer(idev, idev->mc_maxdelay); 1864 } 1865 __in6_dev_put(idev); 1866 } 1867 1868 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1869 const struct in6_addr *psfsrc) 1870 { 1871 struct ip6_sf_list *psf, *psf_prev; 1872 int rv = 0; 1873 1874 psf_prev = NULL; 1875 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1876 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1877 break; 1878 psf_prev = psf; 1879 } 1880 if (!psf || psf->sf_count[sfmode] == 0) { 1881 /* source filter not found, or count wrong => bug */ 1882 return -ESRCH; 1883 } 1884 psf->sf_count[sfmode]--; 1885 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1886 struct inet6_dev *idev = pmc->idev; 1887 1888 /* no more filters for this source */ 1889 if (psf_prev) 1890 psf_prev->sf_next = psf->sf_next; 1891 else 1892 pmc->mca_sources = psf->sf_next; 1893 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1894 !MLD_V1_SEEN(idev)) { 1895 psf->sf_crcount = idev->mc_qrv; 1896 psf->sf_next = pmc->mca_tomb; 1897 pmc->mca_tomb = psf; 1898 rv = 1; 1899 } else 1900 kfree(psf); 1901 } 1902 return rv; 1903 } 1904 1905 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 1906 int sfmode, int sfcount, const struct in6_addr *psfsrc, 1907 int delta) 1908 { 1909 struct ifmcaddr6 *pmc; 1910 int changerec = 0; 1911 int i, err; 1912 1913 if (!idev) 1914 return -ENODEV; 1915 read_lock_bh(&idev->lock); 1916 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1917 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1918 break; 1919 } 1920 if (!pmc) { 1921 /* MCA not found?? bug */ 1922 read_unlock_bh(&idev->lock); 1923 return -ESRCH; 1924 } 1925 spin_lock_bh(&pmc->mca_lock); 1926 sf_markstate(pmc); 1927 if (!delta) { 1928 if (!pmc->mca_sfcount[sfmode]) { 1929 spin_unlock_bh(&pmc->mca_lock); 1930 read_unlock_bh(&idev->lock); 1931 return -EINVAL; 1932 } 1933 pmc->mca_sfcount[sfmode]--; 1934 } 1935 err = 0; 1936 for (i=0; i<sfcount; i++) { 1937 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1938 1939 changerec |= rv > 0; 1940 if (!err && rv < 0) 1941 err = rv; 1942 } 1943 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1944 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1945 pmc->mca_sfcount[MCAST_INCLUDE]) { 1946 struct ip6_sf_list *psf; 1947 1948 /* filter mode change */ 1949 pmc->mca_sfmode = MCAST_INCLUDE; 1950 pmc->mca_crcount = idev->mc_qrv; 1951 idev->mc_ifc_count = pmc->mca_crcount; 1952 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1953 psf->sf_crcount = 0; 1954 mld_ifc_event(pmc->idev); 1955 } else if (sf_setstate(pmc) || changerec) 1956 mld_ifc_event(pmc->idev); 1957 spin_unlock_bh(&pmc->mca_lock); 1958 read_unlock_bh(&idev->lock); 1959 return err; 1960 } 1961 1962 /* 1963 * Add multicast single-source filter to the interface list 1964 */ 1965 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1966 const struct in6_addr *psfsrc) 1967 { 1968 struct ip6_sf_list *psf, *psf_prev; 1969 1970 psf_prev = NULL; 1971 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1972 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1973 break; 1974 psf_prev = psf; 1975 } 1976 if (!psf) { 1977 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1978 if (!psf) 1979 return -ENOBUFS; 1980 1981 psf->sf_addr = *psfsrc; 1982 if (psf_prev) { 1983 psf_prev->sf_next = psf; 1984 } else 1985 pmc->mca_sources = psf; 1986 } 1987 psf->sf_count[sfmode]++; 1988 return 0; 1989 } 1990 1991 static void sf_markstate(struct ifmcaddr6 *pmc) 1992 { 1993 struct ip6_sf_list *psf; 1994 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1995 1996 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1997 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1998 psf->sf_oldin = mca_xcount == 1999 psf->sf_count[MCAST_EXCLUDE] && 2000 !psf->sf_count[MCAST_INCLUDE]; 2001 } else 2002 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2003 } 2004 2005 static int sf_setstate(struct ifmcaddr6 *pmc) 2006 { 2007 struct ip6_sf_list *psf, *dpsf; 2008 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2009 int qrv = pmc->idev->mc_qrv; 2010 int new_in, rv; 2011 2012 rv = 0; 2013 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2014 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2015 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2016 !psf->sf_count[MCAST_INCLUDE]; 2017 } else 2018 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2019 if (new_in) { 2020 if (!psf->sf_oldin) { 2021 struct ip6_sf_list *prev = NULL; 2022 2023 for (dpsf=pmc->mca_tomb; dpsf; 2024 dpsf=dpsf->sf_next) { 2025 if (ipv6_addr_equal(&dpsf->sf_addr, 2026 &psf->sf_addr)) 2027 break; 2028 prev = dpsf; 2029 } 2030 if (dpsf) { 2031 if (prev) 2032 prev->sf_next = dpsf->sf_next; 2033 else 2034 pmc->mca_tomb = dpsf->sf_next; 2035 kfree(dpsf); 2036 } 2037 psf->sf_crcount = qrv; 2038 rv++; 2039 } 2040 } else if (psf->sf_oldin) { 2041 psf->sf_crcount = 0; 2042 /* 2043 * add or update "delete" records if an active filter 2044 * is now inactive 2045 */ 2046 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2047 if (ipv6_addr_equal(&dpsf->sf_addr, 2048 &psf->sf_addr)) 2049 break; 2050 if (!dpsf) { 2051 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2052 if (!dpsf) 2053 continue; 2054 *dpsf = *psf; 2055 /* pmc->mca_lock held by callers */ 2056 dpsf->sf_next = pmc->mca_tomb; 2057 pmc->mca_tomb = dpsf; 2058 } 2059 dpsf->sf_crcount = qrv; 2060 rv++; 2061 } 2062 } 2063 return rv; 2064 } 2065 2066 /* 2067 * Add multicast source filter list to the interface list 2068 */ 2069 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2070 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2071 int delta) 2072 { 2073 struct ifmcaddr6 *pmc; 2074 int isexclude; 2075 int i, err; 2076 2077 if (!idev) 2078 return -ENODEV; 2079 read_lock_bh(&idev->lock); 2080 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2081 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2082 break; 2083 } 2084 if (!pmc) { 2085 /* MCA not found?? bug */ 2086 read_unlock_bh(&idev->lock); 2087 return -ESRCH; 2088 } 2089 spin_lock_bh(&pmc->mca_lock); 2090 2091 sf_markstate(pmc); 2092 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2093 if (!delta) 2094 pmc->mca_sfcount[sfmode]++; 2095 err = 0; 2096 for (i=0; i<sfcount; i++) { 2097 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2098 if (err) 2099 break; 2100 } 2101 if (err) { 2102 int j; 2103 2104 if (!delta) 2105 pmc->mca_sfcount[sfmode]--; 2106 for (j=0; j<i; j++) 2107 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2108 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2109 struct ip6_sf_list *psf; 2110 2111 /* filter mode change */ 2112 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2113 pmc->mca_sfmode = MCAST_EXCLUDE; 2114 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2115 pmc->mca_sfmode = MCAST_INCLUDE; 2116 /* else no filters; keep old mode for reports */ 2117 2118 pmc->mca_crcount = idev->mc_qrv; 2119 idev->mc_ifc_count = pmc->mca_crcount; 2120 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2121 psf->sf_crcount = 0; 2122 mld_ifc_event(idev); 2123 } else if (sf_setstate(pmc)) 2124 mld_ifc_event(idev); 2125 spin_unlock_bh(&pmc->mca_lock); 2126 read_unlock_bh(&idev->lock); 2127 return err; 2128 } 2129 2130 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2131 { 2132 struct ip6_sf_list *psf, *nextpsf; 2133 2134 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2135 nextpsf = psf->sf_next; 2136 kfree(psf); 2137 } 2138 pmc->mca_tomb = NULL; 2139 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2140 nextpsf = psf->sf_next; 2141 kfree(psf); 2142 } 2143 pmc->mca_sources = NULL; 2144 pmc->mca_sfmode = MCAST_EXCLUDE; 2145 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2146 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2147 } 2148 2149 2150 static void igmp6_join_group(struct ifmcaddr6 *ma) 2151 { 2152 unsigned long delay; 2153 2154 if (ma->mca_flags & MAF_NOREPORT) 2155 return; 2156 2157 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2158 2159 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2160 2161 spin_lock_bh(&ma->mca_lock); 2162 if (del_timer(&ma->mca_timer)) { 2163 atomic_dec(&ma->mca_refcnt); 2164 delay = ma->mca_timer.expires - jiffies; 2165 } 2166 2167 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2168 atomic_inc(&ma->mca_refcnt); 2169 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2170 spin_unlock_bh(&ma->mca_lock); 2171 } 2172 2173 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2174 struct inet6_dev *idev) 2175 { 2176 int err; 2177 2178 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2179 * so no other readers or writers of iml or its sflist 2180 */ 2181 if (!iml->sflist) { 2182 /* any-source empty exclude case */ 2183 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2184 } 2185 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2186 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2187 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2188 iml->sflist = NULL; 2189 return err; 2190 } 2191 2192 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2193 { 2194 if (MLD_V1_SEEN(ma->idev)) { 2195 if (ma->mca_flags & MAF_LAST_REPORTER) 2196 igmp6_send(&ma->mca_addr, ma->idev->dev, 2197 ICMPV6_MGM_REDUCTION); 2198 } else { 2199 mld_add_delrec(ma->idev, ma); 2200 mld_ifc_event(ma->idev); 2201 } 2202 } 2203 2204 static void mld_gq_timer_expire(unsigned long data) 2205 { 2206 struct inet6_dev *idev = (struct inet6_dev *)data; 2207 2208 idev->mc_gq_running = 0; 2209 mld_send_report(idev, NULL); 2210 __in6_dev_put(idev); 2211 } 2212 2213 static void mld_ifc_timer_expire(unsigned long data) 2214 { 2215 struct inet6_dev *idev = (struct inet6_dev *)data; 2216 2217 mld_send_cr(idev); 2218 if (idev->mc_ifc_count) { 2219 idev->mc_ifc_count--; 2220 if (idev->mc_ifc_count) 2221 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2222 } 2223 __in6_dev_put(idev); 2224 } 2225 2226 static void mld_ifc_event(struct inet6_dev *idev) 2227 { 2228 if (MLD_V1_SEEN(idev)) 2229 return; 2230 idev->mc_ifc_count = idev->mc_qrv; 2231 mld_ifc_start_timer(idev, 1); 2232 } 2233 2234 2235 static void igmp6_timer_handler(unsigned long data) 2236 { 2237 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2238 2239 if (MLD_V1_SEEN(ma->idev)) 2240 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2241 else 2242 mld_send_report(ma->idev, ma); 2243 2244 spin_lock(&ma->mca_lock); 2245 ma->mca_flags |= MAF_LAST_REPORTER; 2246 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2247 spin_unlock(&ma->mca_lock); 2248 ma_put(ma); 2249 } 2250 2251 /* Device changing type */ 2252 2253 void ipv6_mc_unmap(struct inet6_dev *idev) 2254 { 2255 struct ifmcaddr6 *i; 2256 2257 /* Install multicast list, except for all-nodes (already installed) */ 2258 2259 read_lock_bh(&idev->lock); 2260 for (i = idev->mc_list; i; i = i->next) 2261 igmp6_group_dropped(i); 2262 read_unlock_bh(&idev->lock); 2263 } 2264 2265 void ipv6_mc_remap(struct inet6_dev *idev) 2266 { 2267 ipv6_mc_up(idev); 2268 } 2269 2270 /* Device going down */ 2271 2272 void ipv6_mc_down(struct inet6_dev *idev) 2273 { 2274 struct ifmcaddr6 *i; 2275 2276 /* Withdraw multicast list */ 2277 2278 read_lock_bh(&idev->lock); 2279 idev->mc_ifc_count = 0; 2280 if (del_timer(&idev->mc_ifc_timer)) 2281 __in6_dev_put(idev); 2282 idev->mc_gq_running = 0; 2283 if (del_timer(&idev->mc_gq_timer)) 2284 __in6_dev_put(idev); 2285 if (del_timer(&idev->mc_dad_timer)) 2286 __in6_dev_put(idev); 2287 2288 for (i = idev->mc_list; i; i=i->next) 2289 igmp6_group_dropped(i); 2290 read_unlock_bh(&idev->lock); 2291 2292 mld_clear_delrec(idev); 2293 } 2294 2295 2296 /* Device going up */ 2297 2298 void ipv6_mc_up(struct inet6_dev *idev) 2299 { 2300 struct ifmcaddr6 *i; 2301 2302 /* Install multicast list, except for all-nodes (already installed) */ 2303 2304 read_lock_bh(&idev->lock); 2305 for (i = idev->mc_list; i; i=i->next) 2306 igmp6_group_added(i); 2307 read_unlock_bh(&idev->lock); 2308 } 2309 2310 /* IPv6 device initialization. */ 2311 2312 void ipv6_mc_init_dev(struct inet6_dev *idev) 2313 { 2314 write_lock_bh(&idev->lock); 2315 spin_lock_init(&idev->mc_lock); 2316 idev->mc_gq_running = 0; 2317 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2318 (unsigned long)idev); 2319 idev->mc_tomb = NULL; 2320 idev->mc_ifc_count = 0; 2321 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2322 (unsigned long)idev); 2323 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, 2324 (unsigned long)idev); 2325 idev->mc_qrv = MLD_QRV_DEFAULT; 2326 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2327 idev->mc_v1_seen = 0; 2328 write_unlock_bh(&idev->lock); 2329 } 2330 2331 /* 2332 * Device is about to be destroyed: clean up. 2333 */ 2334 2335 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2336 { 2337 struct ifmcaddr6 *i; 2338 2339 /* Deactivate timers */ 2340 ipv6_mc_down(idev); 2341 2342 /* Delete all-nodes address. */ 2343 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2344 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2345 * fail. 2346 */ 2347 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2348 2349 if (idev->cnf.forwarding) 2350 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2351 2352 write_lock_bh(&idev->lock); 2353 while ((i = idev->mc_list) != NULL) { 2354 idev->mc_list = i->next; 2355 write_unlock_bh(&idev->lock); 2356 2357 igmp6_group_dropped(i); 2358 ma_put(i); 2359 2360 write_lock_bh(&idev->lock); 2361 } 2362 write_unlock_bh(&idev->lock); 2363 } 2364 2365 #ifdef CONFIG_PROC_FS 2366 struct igmp6_mc_iter_state { 2367 struct seq_net_private p; 2368 struct net_device *dev; 2369 struct inet6_dev *idev; 2370 }; 2371 2372 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2373 2374 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2375 { 2376 struct ifmcaddr6 *im = NULL; 2377 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2378 struct net *net = seq_file_net(seq); 2379 2380 state->idev = NULL; 2381 for_each_netdev_rcu(net, state->dev) { 2382 struct inet6_dev *idev; 2383 idev = __in6_dev_get(state->dev); 2384 if (!idev) 2385 continue; 2386 read_lock_bh(&idev->lock); 2387 im = idev->mc_list; 2388 if (im) { 2389 state->idev = idev; 2390 break; 2391 } 2392 read_unlock_bh(&idev->lock); 2393 } 2394 return im; 2395 } 2396 2397 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2398 { 2399 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2400 2401 im = im->next; 2402 while (!im) { 2403 if (likely(state->idev != NULL)) 2404 read_unlock_bh(&state->idev->lock); 2405 2406 state->dev = next_net_device_rcu(state->dev); 2407 if (!state->dev) { 2408 state->idev = NULL; 2409 break; 2410 } 2411 state->idev = __in6_dev_get(state->dev); 2412 if (!state->idev) 2413 continue; 2414 read_lock_bh(&state->idev->lock); 2415 im = state->idev->mc_list; 2416 } 2417 return im; 2418 } 2419 2420 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2421 { 2422 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2423 if (im) 2424 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2425 --pos; 2426 return pos ? NULL : im; 2427 } 2428 2429 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2430 __acquires(RCU) 2431 { 2432 rcu_read_lock(); 2433 return igmp6_mc_get_idx(seq, *pos); 2434 } 2435 2436 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2437 { 2438 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2439 2440 ++*pos; 2441 return im; 2442 } 2443 2444 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2445 __releases(RCU) 2446 { 2447 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2448 2449 if (likely(state->idev != NULL)) { 2450 read_unlock_bh(&state->idev->lock); 2451 state->idev = NULL; 2452 } 2453 state->dev = NULL; 2454 rcu_read_unlock(); 2455 } 2456 2457 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2458 { 2459 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2460 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2461 2462 seq_printf(seq, 2463 "%-4d %-15s %pi6 %5d %08X %ld\n", 2464 state->dev->ifindex, state->dev->name, 2465 &im->mca_addr, 2466 im->mca_users, im->mca_flags, 2467 (im->mca_flags&MAF_TIMER_RUNNING) ? 2468 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2469 return 0; 2470 } 2471 2472 static const struct seq_operations igmp6_mc_seq_ops = { 2473 .start = igmp6_mc_seq_start, 2474 .next = igmp6_mc_seq_next, 2475 .stop = igmp6_mc_seq_stop, 2476 .show = igmp6_mc_seq_show, 2477 }; 2478 2479 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2480 { 2481 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2482 sizeof(struct igmp6_mc_iter_state)); 2483 } 2484 2485 static const struct file_operations igmp6_mc_seq_fops = { 2486 .owner = THIS_MODULE, 2487 .open = igmp6_mc_seq_open, 2488 .read = seq_read, 2489 .llseek = seq_lseek, 2490 .release = seq_release_net, 2491 }; 2492 2493 struct igmp6_mcf_iter_state { 2494 struct seq_net_private p; 2495 struct net_device *dev; 2496 struct inet6_dev *idev; 2497 struct ifmcaddr6 *im; 2498 }; 2499 2500 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2501 2502 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2503 { 2504 struct ip6_sf_list *psf = NULL; 2505 struct ifmcaddr6 *im = NULL; 2506 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2507 struct net *net = seq_file_net(seq); 2508 2509 state->idev = NULL; 2510 state->im = NULL; 2511 for_each_netdev_rcu(net, state->dev) { 2512 struct inet6_dev *idev; 2513 idev = __in6_dev_get(state->dev); 2514 if (unlikely(idev == NULL)) 2515 continue; 2516 read_lock_bh(&idev->lock); 2517 im = idev->mc_list; 2518 if (likely(im != NULL)) { 2519 spin_lock_bh(&im->mca_lock); 2520 psf = im->mca_sources; 2521 if (likely(psf != NULL)) { 2522 state->im = im; 2523 state->idev = idev; 2524 break; 2525 } 2526 spin_unlock_bh(&im->mca_lock); 2527 } 2528 read_unlock_bh(&idev->lock); 2529 } 2530 return psf; 2531 } 2532 2533 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2534 { 2535 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2536 2537 psf = psf->sf_next; 2538 while (!psf) { 2539 spin_unlock_bh(&state->im->mca_lock); 2540 state->im = state->im->next; 2541 while (!state->im) { 2542 if (likely(state->idev != NULL)) 2543 read_unlock_bh(&state->idev->lock); 2544 2545 state->dev = next_net_device_rcu(state->dev); 2546 if (!state->dev) { 2547 state->idev = NULL; 2548 goto out; 2549 } 2550 state->idev = __in6_dev_get(state->dev); 2551 if (!state->idev) 2552 continue; 2553 read_lock_bh(&state->idev->lock); 2554 state->im = state->idev->mc_list; 2555 } 2556 if (!state->im) 2557 break; 2558 spin_lock_bh(&state->im->mca_lock); 2559 psf = state->im->mca_sources; 2560 } 2561 out: 2562 return psf; 2563 } 2564 2565 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2566 { 2567 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2568 if (psf) 2569 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2570 --pos; 2571 return pos ? NULL : psf; 2572 } 2573 2574 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2575 __acquires(RCU) 2576 { 2577 rcu_read_lock(); 2578 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2579 } 2580 2581 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2582 { 2583 struct ip6_sf_list *psf; 2584 if (v == SEQ_START_TOKEN) 2585 psf = igmp6_mcf_get_first(seq); 2586 else 2587 psf = igmp6_mcf_get_next(seq, v); 2588 ++*pos; 2589 return psf; 2590 } 2591 2592 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2593 __releases(RCU) 2594 { 2595 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2596 if (likely(state->im != NULL)) { 2597 spin_unlock_bh(&state->im->mca_lock); 2598 state->im = NULL; 2599 } 2600 if (likely(state->idev != NULL)) { 2601 read_unlock_bh(&state->idev->lock); 2602 state->idev = NULL; 2603 } 2604 state->dev = NULL; 2605 rcu_read_unlock(); 2606 } 2607 2608 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2609 { 2610 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2611 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2612 2613 if (v == SEQ_START_TOKEN) { 2614 seq_printf(seq, 2615 "%3s %6s " 2616 "%32s %32s %6s %6s\n", "Idx", 2617 "Device", "Multicast Address", 2618 "Source Address", "INC", "EXC"); 2619 } else { 2620 seq_printf(seq, 2621 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2622 state->dev->ifindex, state->dev->name, 2623 &state->im->mca_addr, 2624 &psf->sf_addr, 2625 psf->sf_count[MCAST_INCLUDE], 2626 psf->sf_count[MCAST_EXCLUDE]); 2627 } 2628 return 0; 2629 } 2630 2631 static const struct seq_operations igmp6_mcf_seq_ops = { 2632 .start = igmp6_mcf_seq_start, 2633 .next = igmp6_mcf_seq_next, 2634 .stop = igmp6_mcf_seq_stop, 2635 .show = igmp6_mcf_seq_show, 2636 }; 2637 2638 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2639 { 2640 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2641 sizeof(struct igmp6_mcf_iter_state)); 2642 } 2643 2644 static const struct file_operations igmp6_mcf_seq_fops = { 2645 .owner = THIS_MODULE, 2646 .open = igmp6_mcf_seq_open, 2647 .read = seq_read, 2648 .llseek = seq_lseek, 2649 .release = seq_release_net, 2650 }; 2651 2652 static int __net_init igmp6_proc_init(struct net *net) 2653 { 2654 int err; 2655 2656 err = -ENOMEM; 2657 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) 2658 goto out; 2659 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, 2660 &igmp6_mcf_seq_fops)) 2661 goto out_proc_net_igmp6; 2662 2663 err = 0; 2664 out: 2665 return err; 2666 2667 out_proc_net_igmp6: 2668 remove_proc_entry("igmp6", net->proc_net); 2669 goto out; 2670 } 2671 2672 static void __net_exit igmp6_proc_exit(struct net *net) 2673 { 2674 remove_proc_entry("mcfilter6", net->proc_net); 2675 remove_proc_entry("igmp6", net->proc_net); 2676 } 2677 #else 2678 static inline int igmp6_proc_init(struct net *net) 2679 { 2680 return 0; 2681 } 2682 static inline void igmp6_proc_exit(struct net *net) 2683 { 2684 } 2685 #endif 2686 2687 static int __net_init igmp6_net_init(struct net *net) 2688 { 2689 int err; 2690 2691 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2692 SOCK_RAW, IPPROTO_ICMPV6, net); 2693 if (err < 0) { 2694 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 2695 err); 2696 goto out; 2697 } 2698 2699 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2700 2701 err = igmp6_proc_init(net); 2702 if (err) 2703 goto out_sock_create; 2704 out: 2705 return err; 2706 2707 out_sock_create: 2708 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2709 goto out; 2710 } 2711 2712 static void __net_exit igmp6_net_exit(struct net *net) 2713 { 2714 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2715 igmp6_proc_exit(net); 2716 } 2717 2718 static struct pernet_operations igmp6_net_ops = { 2719 .init = igmp6_net_init, 2720 .exit = igmp6_net_exit, 2721 }; 2722 2723 int __init igmp6_init(void) 2724 { 2725 return register_pernet_subsys(&igmp6_net_ops); 2726 } 2727 2728 void igmp6_cleanup(void) 2729 { 2730 unregister_pernet_subsys(&igmp6_net_ops); 2731 } 2732