1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Multicast support for IPv6 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 10 */ 11 12 /* Changes: 13 * 14 * yoshfuji : fix format of router-alert option 15 * YOSHIFUJI Hideaki @USAGI: 16 * Fixed source address for MLD message based on 17 * <draft-ietf-magma-mld-source-05.txt>. 18 * YOSHIFUJI Hideaki @USAGI: 19 * - Ignore Queries for invalid addresses. 20 * - MLD for link-local addresses. 21 * David L Stevens <dlstevens@us.ibm.com>: 22 * - MLDv2 support 23 */ 24 25 #include <linux/module.h> 26 #include <linux/errno.h> 27 #include <linux/types.h> 28 #include <linux/string.h> 29 #include <linux/socket.h> 30 #include <linux/sockios.h> 31 #include <linux/jiffies.h> 32 #include <linux/net.h> 33 #include <linux/in.h> 34 #include <linux/in6.h> 35 #include <linux/netdevice.h> 36 #include <linux/if_arp.h> 37 #include <linux/route.h> 38 #include <linux/init.h> 39 #include <linux/proc_fs.h> 40 #include <linux/seq_file.h> 41 #include <linux/slab.h> 42 #include <linux/pkt_sched.h> 43 #include <net/mld.h> 44 #include <linux/workqueue.h> 45 46 #include <linux/netfilter.h> 47 #include <linux/netfilter_ipv6.h> 48 49 #include <net/net_namespace.h> 50 #include <net/sock.h> 51 #include <net/snmp.h> 52 53 #include <net/ipv6.h> 54 #include <net/protocol.h> 55 #include <net/if_inet6.h> 56 #include <net/ndisc.h> 57 #include <net/addrconf.h> 58 #include <net/ip6_route.h> 59 #include <net/inet_common.h> 60 61 #include <net/ip6_checksum.h> 62 63 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 64 static int __mld2_query_bugs[] __attribute__((__unused__)) = { 65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4), 66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4), 67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4) 68 }; 69 70 static struct workqueue_struct *mld_wq; 71 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 72 73 static void igmp6_join_group(struct ifmcaddr6 *ma); 74 static void igmp6_leave_group(struct ifmcaddr6 *ma); 75 static void mld_mca_work(struct work_struct *work); 76 77 static void mld_ifc_event(struct inet6_dev *idev); 78 static bool mld_in_v1_mode(const struct inet6_dev *idev); 79 static int sf_setstate(struct ifmcaddr6 *pmc); 80 static void sf_markstate(struct ifmcaddr6 *pmc); 81 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 82 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 83 int sfmode, int sfcount, const struct in6_addr *psfsrc, 84 int delta); 85 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 86 int sfmode, int sfcount, const struct in6_addr *psfsrc, 87 int delta); 88 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 89 struct inet6_dev *idev); 90 static int __ipv6_dev_mc_inc(struct net_device *dev, 91 const struct in6_addr *addr, unsigned int mode); 92 93 #define MLD_QRV_DEFAULT 2 94 /* RFC3810, 9.2. Query Interval */ 95 #define MLD_QI_DEFAULT (125 * HZ) 96 /* RFC3810, 9.3. Query Response Interval */ 97 #define MLD_QRI_DEFAULT (10 * HZ) 98 99 /* RFC3810, 8.1 Query Version Distinctions */ 100 #define MLD_V1_QUERY_LEN 24 101 #define MLD_V2_QUERY_LEN_MIN 28 102 103 #define IPV6_MLD_MAX_MSF 64 104 105 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 106 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; 107 108 /* 109 * socket join on multicast group 110 */ 111 #define mc_dereference(e, idev) \ 112 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock)) 113 114 #define sock_dereference(e, sk) \ 115 rcu_dereference_protected(e, lockdep_sock_is_held(sk)) 116 117 #define for_each_pmc_socklock(np, sk, pmc) \ 118 for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \ 119 pmc; \ 120 pmc = sock_dereference(pmc->next, sk)) 121 122 #define for_each_pmc_rcu(np, pmc) \ 123 for (pmc = rcu_dereference((np)->ipv6_mc_list); \ 124 pmc; \ 125 pmc = rcu_dereference(pmc->next)) 126 127 #define for_each_psf_mclock(mc, psf) \ 128 for (psf = mc_dereference((mc)->mca_sources, mc->idev); \ 129 psf; \ 130 psf = mc_dereference(psf->sf_next, mc->idev)) 131 132 #define for_each_psf_rcu(mc, psf) \ 133 for (psf = rcu_dereference((mc)->mca_sources); \ 134 psf; \ 135 psf = rcu_dereference(psf->sf_next)) 136 137 #define for_each_psf_tomb(mc, psf) \ 138 for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \ 139 psf; \ 140 psf = mc_dereference(psf->sf_next, mc->idev)) 141 142 #define for_each_mc_mclock(idev, mc) \ 143 for (mc = mc_dereference((idev)->mc_list, idev); \ 144 mc; \ 145 mc = mc_dereference(mc->next, idev)) 146 147 #define for_each_mc_rcu(idev, mc) \ 148 for (mc = rcu_dereference((idev)->mc_list); \ 149 mc; \ 150 mc = rcu_dereference(mc->next)) 151 152 #define for_each_mc_tomb(idev, mc) \ 153 for (mc = mc_dereference((idev)->mc_tomb, idev); \ 154 mc; \ 155 mc = mc_dereference(mc->next, idev)) 156 157 static int unsolicited_report_interval(struct inet6_dev *idev) 158 { 159 int iv; 160 161 if (mld_in_v1_mode(idev)) 162 iv = idev->cnf.mldv1_unsolicited_report_interval; 163 else 164 iv = idev->cnf.mldv2_unsolicited_report_interval; 165 166 return iv > 0 ? iv : 1; 167 } 168 169 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, 170 const struct in6_addr *addr, unsigned int mode) 171 { 172 struct net_device *dev = NULL; 173 struct ipv6_mc_socklist *mc_lst; 174 struct ipv6_pinfo *np = inet6_sk(sk); 175 struct net *net = sock_net(sk); 176 int err; 177 178 ASSERT_RTNL(); 179 180 if (!ipv6_addr_is_multicast(addr)) 181 return -EINVAL; 182 183 for_each_pmc_socklock(np, sk, mc_lst) { 184 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 185 ipv6_addr_equal(&mc_lst->addr, addr)) 186 return -EADDRINUSE; 187 } 188 189 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 190 191 if (!mc_lst) 192 return -ENOMEM; 193 194 mc_lst->next = NULL; 195 mc_lst->addr = *addr; 196 197 if (ifindex == 0) { 198 struct rt6_info *rt; 199 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); 200 if (rt) { 201 dev = rt->dst.dev; 202 ip6_rt_put(rt); 203 } 204 } else 205 dev = __dev_get_by_index(net, ifindex); 206 207 if (!dev) { 208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 209 return -ENODEV; 210 } 211 212 mc_lst->ifindex = dev->ifindex; 213 mc_lst->sfmode = mode; 214 RCU_INIT_POINTER(mc_lst->sflist, NULL); 215 216 /* 217 * now add/increase the group membership on the device 218 */ 219 220 err = __ipv6_dev_mc_inc(dev, addr, mode); 221 222 if (err) { 223 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 224 return err; 225 } 226 227 mc_lst->next = np->ipv6_mc_list; 228 rcu_assign_pointer(np->ipv6_mc_list, mc_lst); 229 230 return 0; 231 } 232 233 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 234 { 235 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); 236 } 237 EXPORT_SYMBOL(ipv6_sock_mc_join); 238 239 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, 240 const struct in6_addr *addr, unsigned int mode) 241 { 242 return __ipv6_sock_mc_join(sk, ifindex, addr, mode); 243 } 244 245 /* 246 * socket leave on multicast group 247 */ 248 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 249 { 250 struct ipv6_pinfo *np = inet6_sk(sk); 251 struct ipv6_mc_socklist *mc_lst; 252 struct ipv6_mc_socklist __rcu **lnk; 253 struct net *net = sock_net(sk); 254 255 ASSERT_RTNL(); 256 257 if (!ipv6_addr_is_multicast(addr)) 258 return -EINVAL; 259 260 for (lnk = &np->ipv6_mc_list; 261 (mc_lst = sock_dereference(*lnk, sk)) != NULL; 262 lnk = &mc_lst->next) { 263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 264 ipv6_addr_equal(&mc_lst->addr, addr)) { 265 struct net_device *dev; 266 267 *lnk = mc_lst->next; 268 269 dev = __dev_get_by_index(net, mc_lst->ifindex); 270 if (dev) { 271 struct inet6_dev *idev = __in6_dev_get(dev); 272 273 ip6_mc_leave_src(sk, mc_lst, idev); 274 if (idev) 275 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 276 } else { 277 ip6_mc_leave_src(sk, mc_lst, NULL); 278 } 279 280 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 281 kfree_rcu(mc_lst, rcu); 282 return 0; 283 } 284 } 285 286 return -EADDRNOTAVAIL; 287 } 288 EXPORT_SYMBOL(ipv6_sock_mc_drop); 289 290 static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net, 291 const struct in6_addr *group, 292 int ifindex) 293 { 294 struct net_device *dev = NULL; 295 struct inet6_dev *idev = NULL; 296 297 if (ifindex == 0) { 298 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0); 299 300 if (rt) { 301 dev = rt->dst.dev; 302 ip6_rt_put(rt); 303 } 304 } else { 305 dev = __dev_get_by_index(net, ifindex); 306 } 307 308 if (!dev) 309 return NULL; 310 idev = __in6_dev_get(dev); 311 if (!idev) 312 return NULL; 313 if (idev->dead) 314 return NULL; 315 return idev; 316 } 317 318 void __ipv6_sock_mc_close(struct sock *sk) 319 { 320 struct ipv6_pinfo *np = inet6_sk(sk); 321 struct ipv6_mc_socklist *mc_lst; 322 struct net *net = sock_net(sk); 323 324 ASSERT_RTNL(); 325 326 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) { 327 struct net_device *dev; 328 329 np->ipv6_mc_list = mc_lst->next; 330 331 dev = __dev_get_by_index(net, mc_lst->ifindex); 332 if (dev) { 333 struct inet6_dev *idev = __in6_dev_get(dev); 334 335 ip6_mc_leave_src(sk, mc_lst, idev); 336 if (idev) 337 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 338 } else { 339 ip6_mc_leave_src(sk, mc_lst, NULL); 340 } 341 342 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); 343 kfree_rcu(mc_lst, rcu); 344 } 345 } 346 347 void ipv6_sock_mc_close(struct sock *sk) 348 { 349 struct ipv6_pinfo *np = inet6_sk(sk); 350 351 if (!rcu_access_pointer(np->ipv6_mc_list)) 352 return; 353 354 rtnl_lock(); 355 lock_sock(sk); 356 __ipv6_sock_mc_close(sk); 357 release_sock(sk); 358 rtnl_unlock(); 359 } 360 361 int ip6_mc_source(int add, int omode, struct sock *sk, 362 struct group_source_req *pgsr) 363 { 364 struct in6_addr *source, *group; 365 struct ipv6_mc_socklist *pmc; 366 struct inet6_dev *idev; 367 struct ipv6_pinfo *inet6 = inet6_sk(sk); 368 struct ip6_sf_socklist *psl; 369 struct net *net = sock_net(sk); 370 int i, j, rv; 371 int leavegroup = 0; 372 int err; 373 374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 376 377 if (!ipv6_addr_is_multicast(group)) 378 return -EINVAL; 379 380 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface); 381 if (!idev) 382 return -ENODEV; 383 384 err = -EADDRNOTAVAIL; 385 386 mutex_lock(&idev->mc_lock); 387 for_each_pmc_socklock(inet6, sk, pmc) { 388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 389 continue; 390 if (ipv6_addr_equal(&pmc->addr, group)) 391 break; 392 } 393 if (!pmc) { /* must have a prior join */ 394 err = -EINVAL; 395 goto done; 396 } 397 /* if a source filter was set, must be the same mode as before */ 398 if (rcu_access_pointer(pmc->sflist)) { 399 if (pmc->sfmode != omode) { 400 err = -EINVAL; 401 goto done; 402 } 403 } else if (pmc->sfmode != omode) { 404 /* allow mode switches for empty-set filters */ 405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 407 pmc->sfmode = omode; 408 } 409 410 psl = sock_dereference(pmc->sflist, sk); 411 if (!add) { 412 if (!psl) 413 goto done; /* err = -EADDRNOTAVAIL */ 414 rv = !0; 415 for (i = 0; i < psl->sl_count; i++) { 416 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 417 if (rv == 0) 418 break; 419 } 420 if (rv) /* source not found */ 421 goto done; /* err = -EADDRNOTAVAIL */ 422 423 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 424 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 425 leavegroup = 1; 426 goto done; 427 } 428 429 /* update the interface filter */ 430 ip6_mc_del_src(idev, group, omode, 1, source, 1); 431 432 for (j = i+1; j < psl->sl_count; j++) 433 psl->sl_addr[j-1] = psl->sl_addr[j]; 434 psl->sl_count--; 435 err = 0; 436 goto done; 437 } 438 /* else, add a new source to the filter */ 439 440 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 441 err = -ENOBUFS; 442 goto done; 443 } 444 if (!psl || psl->sl_count == psl->sl_max) { 445 struct ip6_sf_socklist *newpsl; 446 int count = IP6_SFBLOCK; 447 448 if (psl) 449 count += psl->sl_max; 450 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), 451 GFP_KERNEL); 452 if (!newpsl) { 453 err = -ENOBUFS; 454 goto done; 455 } 456 newpsl->sl_max = count; 457 newpsl->sl_count = count - IP6_SFBLOCK; 458 if (psl) { 459 for (i = 0; i < psl->sl_count; i++) 460 newpsl->sl_addr[i] = psl->sl_addr[i]; 461 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 462 &sk->sk_omem_alloc); 463 } 464 rcu_assign_pointer(pmc->sflist, newpsl); 465 kfree_rcu(psl, rcu); 466 psl = newpsl; 467 } 468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 469 for (i = 0; i < psl->sl_count; i++) { 470 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 471 if (rv == 0) /* There is an error in the address. */ 472 goto done; 473 } 474 for (j = psl->sl_count-1; j >= i; j--) 475 psl->sl_addr[j+1] = psl->sl_addr[j]; 476 psl->sl_addr[i] = *source; 477 psl->sl_count++; 478 err = 0; 479 /* update the interface list */ 480 ip6_mc_add_src(idev, group, omode, 1, source, 1); 481 done: 482 mutex_unlock(&idev->mc_lock); 483 if (leavegroup) 484 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 485 return err; 486 } 487 488 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 489 struct sockaddr_storage *list) 490 { 491 const struct in6_addr *group; 492 struct ipv6_mc_socklist *pmc; 493 struct inet6_dev *idev; 494 struct ipv6_pinfo *inet6 = inet6_sk(sk); 495 struct ip6_sf_socklist *newpsl, *psl; 496 struct net *net = sock_net(sk); 497 int leavegroup = 0; 498 int i, err; 499 500 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 501 502 if (!ipv6_addr_is_multicast(group)) 503 return -EINVAL; 504 if (gsf->gf_fmode != MCAST_INCLUDE && 505 gsf->gf_fmode != MCAST_EXCLUDE) 506 return -EINVAL; 507 508 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface); 509 if (!idev) 510 return -ENODEV; 511 512 err = 0; 513 514 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 515 leavegroup = 1; 516 goto done; 517 } 518 519 for_each_pmc_socklock(inet6, sk, pmc) { 520 if (pmc->ifindex != gsf->gf_interface) 521 continue; 522 if (ipv6_addr_equal(&pmc->addr, group)) 523 break; 524 } 525 if (!pmc) { /* must have a prior join */ 526 err = -EINVAL; 527 goto done; 528 } 529 if (gsf->gf_numsrc) { 530 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, 531 gsf->gf_numsrc), 532 GFP_KERNEL); 533 if (!newpsl) { 534 err = -ENOBUFS; 535 goto done; 536 } 537 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 538 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 539 struct sockaddr_in6 *psin6; 540 541 psin6 = (struct sockaddr_in6 *)list; 542 newpsl->sl_addr[i] = psin6->sin6_addr; 543 } 544 mutex_lock(&idev->mc_lock); 545 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 546 newpsl->sl_count, newpsl->sl_addr, 0); 547 if (err) { 548 mutex_unlock(&idev->mc_lock); 549 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr, 550 newpsl->sl_max)); 551 goto done; 552 } 553 mutex_unlock(&idev->mc_lock); 554 } else { 555 newpsl = NULL; 556 mutex_lock(&idev->mc_lock); 557 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 558 mutex_unlock(&idev->mc_lock); 559 } 560 561 mutex_lock(&idev->mc_lock); 562 psl = sock_dereference(pmc->sflist, sk); 563 if (psl) { 564 ip6_mc_del_src(idev, group, pmc->sfmode, 565 psl->sl_count, psl->sl_addr, 0); 566 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 567 &sk->sk_omem_alloc); 568 } else { 569 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 570 } 571 rcu_assign_pointer(pmc->sflist, newpsl); 572 mutex_unlock(&idev->mc_lock); 573 kfree_rcu(psl, rcu); 574 pmc->sfmode = gsf->gf_fmode; 575 err = 0; 576 done: 577 if (leavegroup) 578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 579 return err; 580 } 581 582 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 583 struct sockaddr_storage __user *p) 584 { 585 struct ipv6_pinfo *inet6 = inet6_sk(sk); 586 const struct in6_addr *group; 587 struct ipv6_mc_socklist *pmc; 588 struct ip6_sf_socklist *psl; 589 int i, count, copycount; 590 591 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 592 593 if (!ipv6_addr_is_multicast(group)) 594 return -EINVAL; 595 596 /* changes to the ipv6_mc_list require the socket lock and 597 * rtnl lock. We have the socket lock, so reading the list is safe. 598 */ 599 600 for_each_pmc_socklock(inet6, sk, pmc) { 601 if (pmc->ifindex != gsf->gf_interface) 602 continue; 603 if (ipv6_addr_equal(group, &pmc->addr)) 604 break; 605 } 606 if (!pmc) /* must have a prior join */ 607 return -EADDRNOTAVAIL; 608 609 gsf->gf_fmode = pmc->sfmode; 610 psl = sock_dereference(pmc->sflist, sk); 611 count = psl ? psl->sl_count : 0; 612 613 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 614 gsf->gf_numsrc = count; 615 616 for (i = 0; i < copycount; i++, p++) { 617 struct sockaddr_in6 *psin6; 618 struct sockaddr_storage ss; 619 620 psin6 = (struct sockaddr_in6 *)&ss; 621 memset(&ss, 0, sizeof(ss)); 622 psin6->sin6_family = AF_INET6; 623 psin6->sin6_addr = psl->sl_addr[i]; 624 if (copy_to_user(p, &ss, sizeof(ss))) 625 return -EFAULT; 626 } 627 return 0; 628 } 629 630 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 631 const struct in6_addr *src_addr) 632 { 633 struct ipv6_pinfo *np = inet6_sk(sk); 634 struct ipv6_mc_socklist *mc; 635 struct ip6_sf_socklist *psl; 636 bool rv = true; 637 638 rcu_read_lock(); 639 for_each_pmc_rcu(np, mc) { 640 if (ipv6_addr_equal(&mc->addr, mc_addr)) 641 break; 642 } 643 if (!mc) { 644 rcu_read_unlock(); 645 return np->mc_all; 646 } 647 psl = rcu_dereference(mc->sflist); 648 if (!psl) { 649 rv = mc->sfmode == MCAST_EXCLUDE; 650 } else { 651 int i; 652 653 for (i = 0; i < psl->sl_count; i++) { 654 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 655 break; 656 } 657 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 658 rv = false; 659 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 660 rv = false; 661 } 662 rcu_read_unlock(); 663 664 return rv; 665 } 666 667 /* called with mc_lock */ 668 static void igmp6_group_added(struct ifmcaddr6 *mc) 669 { 670 struct net_device *dev = mc->idev->dev; 671 char buf[MAX_ADDR_LEN]; 672 673 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 674 IPV6_ADDR_SCOPE_LINKLOCAL) 675 return; 676 677 if (!(mc->mca_flags&MAF_LOADED)) { 678 mc->mca_flags |= MAF_LOADED; 679 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 680 dev_mc_add(dev, buf); 681 } 682 683 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 684 return; 685 686 if (mld_in_v1_mode(mc->idev)) { 687 igmp6_join_group(mc); 688 return; 689 } 690 /* else v2 */ 691 692 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 693 * should not send filter-mode change record as the mode 694 * should be from IN() to IN(A). 695 */ 696 if (mc->mca_sfmode == MCAST_EXCLUDE) 697 mc->mca_crcount = mc->idev->mc_qrv; 698 699 mld_ifc_event(mc->idev); 700 } 701 702 /* called with mc_lock */ 703 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 704 { 705 struct net_device *dev = mc->idev->dev; 706 char buf[MAX_ADDR_LEN]; 707 708 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 709 IPV6_ADDR_SCOPE_LINKLOCAL) 710 return; 711 712 if (mc->mca_flags&MAF_LOADED) { 713 mc->mca_flags &= ~MAF_LOADED; 714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 715 dev_mc_del(dev, buf); 716 } 717 718 if (mc->mca_flags & MAF_NOREPORT) 719 return; 720 721 if (!mc->idev->dead) 722 igmp6_leave_group(mc); 723 724 if (cancel_delayed_work(&mc->mca_work)) 725 refcount_dec(&mc->mca_refcnt); 726 } 727 728 /* 729 * deleted ifmcaddr6 manipulation 730 * called with mc_lock 731 */ 732 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 733 { 734 struct ifmcaddr6 *pmc; 735 736 /* this is an "ifmcaddr6" for convenience; only the fields below 737 * are actually used. In particular, the refcnt and users are not 738 * used for management of the delete list. Using the same structure 739 * for deleted items allows change reports to use common code with 740 * non-deleted or query-response MCA's. 741 */ 742 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 743 if (!pmc) 744 return; 745 746 pmc->idev = im->idev; 747 in6_dev_hold(idev); 748 pmc->mca_addr = im->mca_addr; 749 pmc->mca_crcount = idev->mc_qrv; 750 pmc->mca_sfmode = im->mca_sfmode; 751 if (pmc->mca_sfmode == MCAST_INCLUDE) { 752 struct ip6_sf_list *psf; 753 754 rcu_assign_pointer(pmc->mca_tomb, 755 mc_dereference(im->mca_tomb, idev)); 756 rcu_assign_pointer(pmc->mca_sources, 757 mc_dereference(im->mca_sources, idev)); 758 RCU_INIT_POINTER(im->mca_tomb, NULL); 759 RCU_INIT_POINTER(im->mca_sources, NULL); 760 761 for_each_psf_mclock(pmc, psf) 762 psf->sf_crcount = pmc->mca_crcount; 763 } 764 765 rcu_assign_pointer(pmc->next, idev->mc_tomb); 766 rcu_assign_pointer(idev->mc_tomb, pmc); 767 } 768 769 /* called with mc_lock */ 770 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 771 { 772 struct ip6_sf_list *psf, *sources, *tomb; 773 struct in6_addr *pmca = &im->mca_addr; 774 struct ifmcaddr6 *pmc, *pmc_prev; 775 776 pmc_prev = NULL; 777 for_each_mc_tomb(idev, pmc) { 778 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 779 break; 780 pmc_prev = pmc; 781 } 782 if (pmc) { 783 if (pmc_prev) 784 rcu_assign_pointer(pmc_prev->next, pmc->next); 785 else 786 rcu_assign_pointer(idev->mc_tomb, pmc->next); 787 } 788 789 if (pmc) { 790 im->idev = pmc->idev; 791 if (im->mca_sfmode == MCAST_INCLUDE) { 792 tomb = rcu_replace_pointer(im->mca_tomb, 793 mc_dereference(pmc->mca_tomb, pmc->idev), 794 lockdep_is_held(&im->idev->mc_lock)); 795 rcu_assign_pointer(pmc->mca_tomb, tomb); 796 797 sources = rcu_replace_pointer(im->mca_sources, 798 mc_dereference(pmc->mca_sources, pmc->idev), 799 lockdep_is_held(&im->idev->mc_lock)); 800 rcu_assign_pointer(pmc->mca_sources, sources); 801 for_each_psf_mclock(im, psf) 802 psf->sf_crcount = idev->mc_qrv; 803 } else { 804 im->mca_crcount = idev->mc_qrv; 805 } 806 in6_dev_put(pmc->idev); 807 ip6_mc_clear_src(pmc); 808 kfree_rcu(pmc, rcu); 809 } 810 } 811 812 /* called with mc_lock */ 813 static void mld_clear_delrec(struct inet6_dev *idev) 814 { 815 struct ifmcaddr6 *pmc, *nextpmc; 816 817 pmc = mc_dereference(idev->mc_tomb, idev); 818 RCU_INIT_POINTER(idev->mc_tomb, NULL); 819 820 for (; pmc; pmc = nextpmc) { 821 nextpmc = mc_dereference(pmc->next, idev); 822 ip6_mc_clear_src(pmc); 823 in6_dev_put(pmc->idev); 824 kfree_rcu(pmc, rcu); 825 } 826 827 /* clear dead sources, too */ 828 for_each_mc_mclock(idev, pmc) { 829 struct ip6_sf_list *psf, *psf_next; 830 831 psf = mc_dereference(pmc->mca_tomb, idev); 832 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 833 for (; psf; psf = psf_next) { 834 psf_next = mc_dereference(psf->sf_next, idev); 835 kfree_rcu(psf, rcu); 836 } 837 } 838 } 839 840 static void mld_clear_query(struct inet6_dev *idev) 841 { 842 struct sk_buff *skb; 843 844 spin_lock_bh(&idev->mc_query_lock); 845 while ((skb = __skb_dequeue(&idev->mc_query_queue))) 846 kfree_skb(skb); 847 spin_unlock_bh(&idev->mc_query_lock); 848 } 849 850 static void mld_clear_report(struct inet6_dev *idev) 851 { 852 struct sk_buff *skb; 853 854 spin_lock_bh(&idev->mc_report_lock); 855 while ((skb = __skb_dequeue(&idev->mc_report_queue))) 856 kfree_skb(skb); 857 spin_unlock_bh(&idev->mc_report_lock); 858 } 859 860 static void mca_get(struct ifmcaddr6 *mc) 861 { 862 refcount_inc(&mc->mca_refcnt); 863 } 864 865 static void ma_put(struct ifmcaddr6 *mc) 866 { 867 if (refcount_dec_and_test(&mc->mca_refcnt)) { 868 in6_dev_put(mc->idev); 869 kfree_rcu(mc, rcu); 870 } 871 } 872 873 /* called with mc_lock */ 874 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 875 const struct in6_addr *addr, 876 unsigned int mode) 877 { 878 struct ifmcaddr6 *mc; 879 880 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 881 if (!mc) 882 return NULL; 883 884 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 885 886 mc->mca_addr = *addr; 887 mc->idev = idev; /* reference taken by caller */ 888 mc->mca_users = 1; 889 /* mca_stamp should be updated upon changes */ 890 mc->mca_cstamp = mc->mca_tstamp = jiffies; 891 refcount_set(&mc->mca_refcnt, 1); 892 893 mc->mca_sfmode = mode; 894 mc->mca_sfcount[mode] = 1; 895 896 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 897 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 898 mc->mca_flags |= MAF_NOREPORT; 899 900 return mc; 901 } 902 903 /* 904 * device multicast group inc (add if not found) 905 */ 906 static int __ipv6_dev_mc_inc(struct net_device *dev, 907 const struct in6_addr *addr, unsigned int mode) 908 { 909 struct ifmcaddr6 *mc; 910 struct inet6_dev *idev; 911 912 ASSERT_RTNL(); 913 914 /* we need to take a reference on idev */ 915 idev = in6_dev_get(dev); 916 917 if (!idev) 918 return -EINVAL; 919 920 if (idev->dead) { 921 in6_dev_put(idev); 922 return -ENODEV; 923 } 924 925 mutex_lock(&idev->mc_lock); 926 for_each_mc_mclock(idev, mc) { 927 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 928 mc->mca_users++; 929 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 930 mutex_unlock(&idev->mc_lock); 931 in6_dev_put(idev); 932 return 0; 933 } 934 } 935 936 mc = mca_alloc(idev, addr, mode); 937 if (!mc) { 938 mutex_unlock(&idev->mc_lock); 939 in6_dev_put(idev); 940 return -ENOMEM; 941 } 942 943 rcu_assign_pointer(mc->next, idev->mc_list); 944 rcu_assign_pointer(idev->mc_list, mc); 945 946 mca_get(mc); 947 948 mld_del_delrec(idev, mc); 949 igmp6_group_added(mc); 950 mutex_unlock(&idev->mc_lock); 951 ma_put(mc); 952 return 0; 953 } 954 955 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 956 { 957 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 958 } 959 EXPORT_SYMBOL(ipv6_dev_mc_inc); 960 961 /* 962 * device multicast group del 963 */ 964 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 965 { 966 struct ifmcaddr6 *ma, __rcu **map; 967 968 ASSERT_RTNL(); 969 970 mutex_lock(&idev->mc_lock); 971 for (map = &idev->mc_list; 972 (ma = mc_dereference(*map, idev)); 973 map = &ma->next) { 974 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 975 if (--ma->mca_users == 0) { 976 *map = ma->next; 977 978 igmp6_group_dropped(ma); 979 ip6_mc_clear_src(ma); 980 mutex_unlock(&idev->mc_lock); 981 982 ma_put(ma); 983 return 0; 984 } 985 mutex_unlock(&idev->mc_lock); 986 return 0; 987 } 988 } 989 990 mutex_unlock(&idev->mc_lock); 991 return -ENOENT; 992 } 993 994 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 995 { 996 struct inet6_dev *idev; 997 int err; 998 999 ASSERT_RTNL(); 1000 1001 idev = __in6_dev_get(dev); 1002 if (!idev) 1003 err = -ENODEV; 1004 else 1005 err = __ipv6_dev_mc_dec(idev, addr); 1006 1007 return err; 1008 } 1009 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1010 1011 /* 1012 * check if the interface/address pair is valid 1013 */ 1014 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1015 const struct in6_addr *src_addr) 1016 { 1017 struct inet6_dev *idev; 1018 struct ifmcaddr6 *mc; 1019 bool rv = false; 1020 1021 rcu_read_lock(); 1022 idev = __in6_dev_get(dev); 1023 if (idev) { 1024 for_each_mc_rcu(idev, mc) { 1025 if (ipv6_addr_equal(&mc->mca_addr, group)) 1026 break; 1027 } 1028 if (mc) { 1029 if (src_addr && !ipv6_addr_any(src_addr)) { 1030 struct ip6_sf_list *psf; 1031 1032 for_each_psf_rcu(mc, psf) { 1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1034 break; 1035 } 1036 if (psf) 1037 rv = psf->sf_count[MCAST_INCLUDE] || 1038 psf->sf_count[MCAST_EXCLUDE] != 1039 mc->mca_sfcount[MCAST_EXCLUDE]; 1040 else 1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; 1042 } else 1043 rv = true; /* don't filter unspecified source */ 1044 } 1045 } 1046 rcu_read_unlock(); 1047 return rv; 1048 } 1049 1050 /* called with mc_lock */ 1051 static void mld_gq_start_work(struct inet6_dev *idev) 1052 { 1053 unsigned long tv = prandom_u32() % idev->mc_maxdelay; 1054 1055 idev->mc_gq_running = 1; 1056 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1057 in6_dev_hold(idev); 1058 } 1059 1060 /* called with mc_lock */ 1061 static void mld_gq_stop_work(struct inet6_dev *idev) 1062 { 1063 idev->mc_gq_running = 0; 1064 if (cancel_delayed_work(&idev->mc_gq_work)) 1065 __in6_dev_put(idev); 1066 } 1067 1068 /* called with mc_lock */ 1069 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1070 { 1071 unsigned long tv = prandom_u32() % delay; 1072 1073 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1074 in6_dev_hold(idev); 1075 } 1076 1077 /* called with mc_lock */ 1078 static void mld_ifc_stop_work(struct inet6_dev *idev) 1079 { 1080 idev->mc_ifc_count = 0; 1081 if (cancel_delayed_work(&idev->mc_ifc_work)) 1082 __in6_dev_put(idev); 1083 } 1084 1085 /* called with mc_lock */ 1086 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1087 { 1088 unsigned long tv = prandom_u32() % delay; 1089 1090 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1091 in6_dev_hold(idev); 1092 } 1093 1094 static void mld_dad_stop_work(struct inet6_dev *idev) 1095 { 1096 if (cancel_delayed_work(&idev->mc_dad_work)) 1097 __in6_dev_put(idev); 1098 } 1099 1100 static void mld_query_stop_work(struct inet6_dev *idev) 1101 { 1102 spin_lock_bh(&idev->mc_query_lock); 1103 if (cancel_delayed_work(&idev->mc_query_work)) 1104 __in6_dev_put(idev); 1105 spin_unlock_bh(&idev->mc_query_lock); 1106 } 1107 1108 static void mld_report_stop_work(struct inet6_dev *idev) 1109 { 1110 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1111 __in6_dev_put(idev); 1112 } 1113 1114 /* 1115 * IGMP handling (alias multicast ICMPv6 messages) 1116 * called with mc_lock 1117 */ 1118 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1119 { 1120 unsigned long delay = resptime; 1121 1122 /* Do not start work for these addresses */ 1123 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1124 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1125 return; 1126 1127 if (cancel_delayed_work(&ma->mca_work)) { 1128 refcount_dec(&ma->mca_refcnt); 1129 delay = ma->mca_work.timer.expires - jiffies; 1130 } 1131 1132 if (delay >= resptime) 1133 delay = prandom_u32() % resptime; 1134 1135 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1136 refcount_inc(&ma->mca_refcnt); 1137 ma->mca_flags |= MAF_TIMER_RUNNING; 1138 } 1139 1140 /* mark EXCLUDE-mode sources 1141 * called with mc_lock 1142 */ 1143 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1144 const struct in6_addr *srcs) 1145 { 1146 struct ip6_sf_list *psf; 1147 int i, scount; 1148 1149 scount = 0; 1150 for_each_psf_mclock(pmc, psf) { 1151 if (scount == nsrcs) 1152 break; 1153 for (i = 0; i < nsrcs; i++) { 1154 /* skip inactive filters */ 1155 if (psf->sf_count[MCAST_INCLUDE] || 1156 pmc->mca_sfcount[MCAST_EXCLUDE] != 1157 psf->sf_count[MCAST_EXCLUDE]) 1158 break; 1159 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1160 scount++; 1161 break; 1162 } 1163 } 1164 } 1165 pmc->mca_flags &= ~MAF_GSQUERY; 1166 if (scount == nsrcs) /* all sources excluded */ 1167 return false; 1168 return true; 1169 } 1170 1171 /* called with mc_lock */ 1172 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1173 const struct in6_addr *srcs) 1174 { 1175 struct ip6_sf_list *psf; 1176 int i, scount; 1177 1178 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1179 return mld_xmarksources(pmc, nsrcs, srcs); 1180 1181 /* mark INCLUDE-mode sources */ 1182 1183 scount = 0; 1184 for_each_psf_mclock(pmc, psf) { 1185 if (scount == nsrcs) 1186 break; 1187 for (i = 0; i < nsrcs; i++) { 1188 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1189 psf->sf_gsresp = 1; 1190 scount++; 1191 break; 1192 } 1193 } 1194 } 1195 if (!scount) { 1196 pmc->mca_flags &= ~MAF_GSQUERY; 1197 return false; 1198 } 1199 pmc->mca_flags |= MAF_GSQUERY; 1200 return true; 1201 } 1202 1203 static int mld_force_mld_version(const struct inet6_dev *idev) 1204 { 1205 /* Normally, both are 0 here. If enforcement to a particular is 1206 * being used, individual device enforcement will have a lower 1207 * precedence over 'all' device (.../conf/all/force_mld_version). 1208 */ 1209 1210 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1211 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1212 else 1213 return idev->cnf.force_mld_version; 1214 } 1215 1216 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1217 { 1218 return mld_force_mld_version(idev) == 2; 1219 } 1220 1221 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1222 { 1223 return mld_force_mld_version(idev) == 1; 1224 } 1225 1226 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1227 { 1228 if (mld_in_v2_mode_only(idev)) 1229 return false; 1230 if (mld_in_v1_mode_only(idev)) 1231 return true; 1232 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1233 return true; 1234 1235 return false; 1236 } 1237 1238 static void mld_set_v1_mode(struct inet6_dev *idev) 1239 { 1240 /* RFC3810, relevant sections: 1241 * - 9.1. Robustness Variable 1242 * - 9.2. Query Interval 1243 * - 9.3. Query Response Interval 1244 * - 9.12. Older Version Querier Present Timeout 1245 */ 1246 unsigned long switchback; 1247 1248 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1249 1250 idev->mc_v1_seen = jiffies + switchback; 1251 } 1252 1253 static void mld_update_qrv(struct inet6_dev *idev, 1254 const struct mld2_query *mlh2) 1255 { 1256 /* RFC3810, relevant sections: 1257 * - 5.1.8. QRV (Querier's Robustness Variable) 1258 * - 9.1. Robustness Variable 1259 */ 1260 1261 /* The value of the Robustness Variable MUST NOT be zero, 1262 * and SHOULD NOT be one. Catch this here if we ever run 1263 * into such a case in future. 1264 */ 1265 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1266 WARN_ON(idev->mc_qrv == 0); 1267 1268 if (mlh2->mld2q_qrv > 0) 1269 idev->mc_qrv = mlh2->mld2q_qrv; 1270 1271 if (unlikely(idev->mc_qrv < min_qrv)) { 1272 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1273 idev->mc_qrv, min_qrv); 1274 idev->mc_qrv = min_qrv; 1275 } 1276 } 1277 1278 static void mld_update_qi(struct inet6_dev *idev, 1279 const struct mld2_query *mlh2) 1280 { 1281 /* RFC3810, relevant sections: 1282 * - 5.1.9. QQIC (Querier's Query Interval Code) 1283 * - 9.2. Query Interval 1284 * - 9.12. Older Version Querier Present Timeout 1285 * (the [Query Interval] in the last Query received) 1286 */ 1287 unsigned long mc_qqi; 1288 1289 if (mlh2->mld2q_qqic < 128) { 1290 mc_qqi = mlh2->mld2q_qqic; 1291 } else { 1292 unsigned long mc_man, mc_exp; 1293 1294 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1295 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1296 1297 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1298 } 1299 1300 idev->mc_qi = mc_qqi * HZ; 1301 } 1302 1303 static void mld_update_qri(struct inet6_dev *idev, 1304 const struct mld2_query *mlh2) 1305 { 1306 /* RFC3810, relevant sections: 1307 * - 5.1.3. Maximum Response Code 1308 * - 9.3. Query Response Interval 1309 */ 1310 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1311 } 1312 1313 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1314 unsigned long *max_delay, bool v1_query) 1315 { 1316 unsigned long mldv1_md; 1317 1318 /* Ignore v1 queries */ 1319 if (mld_in_v2_mode_only(idev)) 1320 return -EINVAL; 1321 1322 mldv1_md = ntohs(mld->mld_maxdelay); 1323 1324 /* When in MLDv1 fallback and a MLDv2 router start-up being 1325 * unaware of current MLDv1 operation, the MRC == MRD mapping 1326 * only works when the exponential algorithm is not being 1327 * used (as MLDv1 is unaware of such things). 1328 * 1329 * According to the RFC author, the MLDv2 implementations 1330 * he's aware of all use a MRC < 32768 on start up queries. 1331 * 1332 * Thus, should we *ever* encounter something else larger 1333 * than that, just assume the maximum possible within our 1334 * reach. 1335 */ 1336 if (!v1_query) 1337 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1338 1339 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1340 1341 /* MLDv1 router present: we need to go into v1 mode *only* 1342 * when an MLDv1 query is received as per section 9.12. of 1343 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1344 * queries MUST be of exactly 24 octets. 1345 */ 1346 if (v1_query) 1347 mld_set_v1_mode(idev); 1348 1349 /* cancel MLDv2 report work */ 1350 mld_gq_stop_work(idev); 1351 /* cancel the interface change work */ 1352 mld_ifc_stop_work(idev); 1353 /* clear deleted report items */ 1354 mld_clear_delrec(idev); 1355 1356 return 0; 1357 } 1358 1359 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1360 unsigned long *max_delay) 1361 { 1362 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1363 1364 mld_update_qrv(idev, mld); 1365 mld_update_qi(idev, mld); 1366 mld_update_qri(idev, mld); 1367 1368 idev->mc_maxdelay = *max_delay; 1369 1370 return; 1371 } 1372 1373 /* called with rcu_read_lock() */ 1374 void igmp6_event_query(struct sk_buff *skb) 1375 { 1376 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1377 1378 if (!idev || idev->dead) 1379 goto out; 1380 1381 spin_lock_bh(&idev->mc_query_lock); 1382 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1383 __skb_queue_tail(&idev->mc_query_queue, skb); 1384 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1385 in6_dev_hold(idev); 1386 skb = NULL; 1387 } 1388 spin_unlock_bh(&idev->mc_query_lock); 1389 out: 1390 kfree_skb(skb); 1391 } 1392 1393 static void __mld_query_work(struct sk_buff *skb) 1394 { 1395 struct mld2_query *mlh2 = NULL; 1396 const struct in6_addr *group; 1397 unsigned long max_delay; 1398 struct inet6_dev *idev; 1399 struct ifmcaddr6 *ma; 1400 struct mld_msg *mld; 1401 int group_type; 1402 int mark = 0; 1403 int len, err; 1404 1405 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1406 goto kfree_skb; 1407 1408 /* compute payload length excluding extension headers */ 1409 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1410 len -= skb_network_header_len(skb); 1411 1412 /* RFC3810 6.2 1413 * Upon reception of an MLD message that contains a Query, the node 1414 * checks if the source address of the message is a valid link-local 1415 * address, if the Hop Limit is set to 1, and if the Router Alert 1416 * option is present in the Hop-By-Hop Options header of the IPv6 1417 * packet. If any of these checks fails, the packet is dropped. 1418 */ 1419 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1420 ipv6_hdr(skb)->hop_limit != 1 || 1421 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1422 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1423 goto kfree_skb; 1424 1425 idev = in6_dev_get(skb->dev); 1426 if (!idev) 1427 goto kfree_skb; 1428 1429 mld = (struct mld_msg *)icmp6_hdr(skb); 1430 group = &mld->mld_mca; 1431 group_type = ipv6_addr_type(group); 1432 1433 if (group_type != IPV6_ADDR_ANY && 1434 !(group_type&IPV6_ADDR_MULTICAST)) 1435 goto out; 1436 1437 if (len < MLD_V1_QUERY_LEN) { 1438 goto out; 1439 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1440 err = mld_process_v1(idev, mld, &max_delay, 1441 len == MLD_V1_QUERY_LEN); 1442 if (err < 0) 1443 goto out; 1444 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1445 int srcs_offset = sizeof(struct mld2_query) - 1446 sizeof(struct icmp6hdr); 1447 1448 if (!pskb_may_pull(skb, srcs_offset)) 1449 goto out; 1450 1451 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1452 1453 mld_process_v2(idev, mlh2, &max_delay); 1454 1455 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1456 if (mlh2->mld2q_nsrcs) 1457 goto out; /* no sources allowed */ 1458 1459 mld_gq_start_work(idev); 1460 goto out; 1461 } 1462 /* mark sources to include, if group & source-specific */ 1463 if (mlh2->mld2q_nsrcs != 0) { 1464 if (!pskb_may_pull(skb, srcs_offset + 1465 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1466 goto out; 1467 1468 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1469 mark = 1; 1470 } 1471 } else { 1472 goto out; 1473 } 1474 1475 if (group_type == IPV6_ADDR_ANY) { 1476 for_each_mc_mclock(idev, ma) { 1477 igmp6_group_queried(ma, max_delay); 1478 } 1479 } else { 1480 for_each_mc_mclock(idev, ma) { 1481 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1482 continue; 1483 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1484 /* gsquery <- gsquery && mark */ 1485 if (!mark) 1486 ma->mca_flags &= ~MAF_GSQUERY; 1487 } else { 1488 /* gsquery <- mark */ 1489 if (mark) 1490 ma->mca_flags |= MAF_GSQUERY; 1491 else 1492 ma->mca_flags &= ~MAF_GSQUERY; 1493 } 1494 if (!(ma->mca_flags & MAF_GSQUERY) || 1495 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1496 igmp6_group_queried(ma, max_delay); 1497 break; 1498 } 1499 } 1500 1501 out: 1502 in6_dev_put(idev); 1503 kfree_skb: 1504 consume_skb(skb); 1505 } 1506 1507 static void mld_query_work(struct work_struct *work) 1508 { 1509 struct inet6_dev *idev = container_of(to_delayed_work(work), 1510 struct inet6_dev, 1511 mc_query_work); 1512 struct sk_buff_head q; 1513 struct sk_buff *skb; 1514 bool rework = false; 1515 int cnt = 0; 1516 1517 skb_queue_head_init(&q); 1518 1519 spin_lock_bh(&idev->mc_query_lock); 1520 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1521 __skb_queue_tail(&q, skb); 1522 1523 if (++cnt >= MLD_MAX_QUEUE) { 1524 rework = true; 1525 schedule_delayed_work(&idev->mc_query_work, 0); 1526 break; 1527 } 1528 } 1529 spin_unlock_bh(&idev->mc_query_lock); 1530 1531 mutex_lock(&idev->mc_lock); 1532 while ((skb = __skb_dequeue(&q))) 1533 __mld_query_work(skb); 1534 mutex_unlock(&idev->mc_lock); 1535 1536 if (!rework) 1537 in6_dev_put(idev); 1538 } 1539 1540 /* called with rcu_read_lock() */ 1541 void igmp6_event_report(struct sk_buff *skb) 1542 { 1543 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1544 1545 if (!idev || idev->dead) 1546 goto out; 1547 1548 spin_lock_bh(&idev->mc_report_lock); 1549 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1550 __skb_queue_tail(&idev->mc_report_queue, skb); 1551 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1552 in6_dev_hold(idev); 1553 skb = NULL; 1554 } 1555 spin_unlock_bh(&idev->mc_report_lock); 1556 out: 1557 kfree_skb(skb); 1558 } 1559 1560 static void __mld_report_work(struct sk_buff *skb) 1561 { 1562 struct inet6_dev *idev; 1563 struct ifmcaddr6 *ma; 1564 struct mld_msg *mld; 1565 int addr_type; 1566 1567 /* Our own report looped back. Ignore it. */ 1568 if (skb->pkt_type == PACKET_LOOPBACK) 1569 goto kfree_skb; 1570 1571 /* send our report if the MC router may not have heard this report */ 1572 if (skb->pkt_type != PACKET_MULTICAST && 1573 skb->pkt_type != PACKET_BROADCAST) 1574 goto kfree_skb; 1575 1576 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1577 goto kfree_skb; 1578 1579 mld = (struct mld_msg *)icmp6_hdr(skb); 1580 1581 /* Drop reports with not link local source */ 1582 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1583 if (addr_type != IPV6_ADDR_ANY && 1584 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1585 goto kfree_skb; 1586 1587 idev = in6_dev_get(skb->dev); 1588 if (!idev) 1589 goto kfree_skb; 1590 1591 /* 1592 * Cancel the work for this group 1593 */ 1594 1595 for_each_mc_mclock(idev, ma) { 1596 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1597 if (cancel_delayed_work(&ma->mca_work)) 1598 refcount_dec(&ma->mca_refcnt); 1599 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1600 MAF_TIMER_RUNNING); 1601 break; 1602 } 1603 } 1604 1605 in6_dev_put(idev); 1606 kfree_skb: 1607 consume_skb(skb); 1608 } 1609 1610 static void mld_report_work(struct work_struct *work) 1611 { 1612 struct inet6_dev *idev = container_of(to_delayed_work(work), 1613 struct inet6_dev, 1614 mc_report_work); 1615 struct sk_buff_head q; 1616 struct sk_buff *skb; 1617 bool rework = false; 1618 int cnt = 0; 1619 1620 skb_queue_head_init(&q); 1621 spin_lock_bh(&idev->mc_report_lock); 1622 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1623 __skb_queue_tail(&q, skb); 1624 1625 if (++cnt >= MLD_MAX_QUEUE) { 1626 rework = true; 1627 schedule_delayed_work(&idev->mc_report_work, 0); 1628 break; 1629 } 1630 } 1631 spin_unlock_bh(&idev->mc_report_lock); 1632 1633 mutex_lock(&idev->mc_lock); 1634 while ((skb = __skb_dequeue(&q))) 1635 __mld_report_work(skb); 1636 mutex_unlock(&idev->mc_lock); 1637 1638 if (!rework) 1639 in6_dev_put(idev); 1640 } 1641 1642 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1643 int gdeleted, int sdeleted) 1644 { 1645 switch (type) { 1646 case MLD2_MODE_IS_INCLUDE: 1647 case MLD2_MODE_IS_EXCLUDE: 1648 if (gdeleted || sdeleted) 1649 return false; 1650 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1651 if (pmc->mca_sfmode == MCAST_INCLUDE) 1652 return true; 1653 /* don't include if this source is excluded 1654 * in all filters 1655 */ 1656 if (psf->sf_count[MCAST_INCLUDE]) 1657 return type == MLD2_MODE_IS_INCLUDE; 1658 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1659 psf->sf_count[MCAST_EXCLUDE]; 1660 } 1661 return false; 1662 case MLD2_CHANGE_TO_INCLUDE: 1663 if (gdeleted || sdeleted) 1664 return false; 1665 return psf->sf_count[MCAST_INCLUDE] != 0; 1666 case MLD2_CHANGE_TO_EXCLUDE: 1667 if (gdeleted || sdeleted) 1668 return false; 1669 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1670 psf->sf_count[MCAST_INCLUDE]) 1671 return false; 1672 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1673 psf->sf_count[MCAST_EXCLUDE]; 1674 case MLD2_ALLOW_NEW_SOURCES: 1675 if (gdeleted || !psf->sf_crcount) 1676 return false; 1677 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1678 case MLD2_BLOCK_OLD_SOURCES: 1679 if (pmc->mca_sfmode == MCAST_INCLUDE) 1680 return gdeleted || (psf->sf_crcount && sdeleted); 1681 return psf->sf_crcount && !gdeleted && !sdeleted; 1682 } 1683 return false; 1684 } 1685 1686 static int 1687 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1688 { 1689 struct ip6_sf_list *psf; 1690 int scount = 0; 1691 1692 for_each_psf_mclock(pmc, psf) { 1693 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1694 continue; 1695 scount++; 1696 } 1697 return scount; 1698 } 1699 1700 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1701 struct net_device *dev, 1702 const struct in6_addr *saddr, 1703 const struct in6_addr *daddr, 1704 int proto, int len) 1705 { 1706 struct ipv6hdr *hdr; 1707 1708 skb->protocol = htons(ETH_P_IPV6); 1709 skb->dev = dev; 1710 1711 skb_reset_network_header(skb); 1712 skb_put(skb, sizeof(struct ipv6hdr)); 1713 hdr = ipv6_hdr(skb); 1714 1715 ip6_flow_hdr(hdr, 0, 0); 1716 1717 hdr->payload_len = htons(len); 1718 hdr->nexthdr = proto; 1719 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1720 1721 hdr->saddr = *saddr; 1722 hdr->daddr = *daddr; 1723 } 1724 1725 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1726 { 1727 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1728 2, 0, 0, IPV6_TLV_PADN, 0 }; 1729 struct net_device *dev = idev->dev; 1730 int hlen = LL_RESERVED_SPACE(dev); 1731 int tlen = dev->needed_tailroom; 1732 struct net *net = dev_net(dev); 1733 const struct in6_addr *saddr; 1734 struct in6_addr addr_buf; 1735 struct mld2_report *pmr; 1736 struct sk_buff *skb; 1737 unsigned int size; 1738 struct sock *sk; 1739 int err; 1740 1741 sk = net->ipv6.igmp_sk; 1742 /* we assume size > sizeof(ra) here 1743 * Also try to not allocate high-order pages for big MTU 1744 */ 1745 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1746 skb = sock_alloc_send_skb(sk, size, 1, &err); 1747 if (!skb) 1748 return NULL; 1749 1750 skb->priority = TC_PRIO_CONTROL; 1751 skb_reserve(skb, hlen); 1752 skb_tailroom_reserve(skb, mtu, tlen); 1753 1754 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1755 /* <draft-ietf-magma-mld-source-05.txt>: 1756 * use unspecified address as the source address 1757 * when a valid link-local address is not available. 1758 */ 1759 saddr = &in6addr_any; 1760 } else 1761 saddr = &addr_buf; 1762 1763 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1764 1765 skb_put_data(skb, ra, sizeof(ra)); 1766 1767 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1768 skb_put(skb, sizeof(*pmr)); 1769 pmr = (struct mld2_report *)skb_transport_header(skb); 1770 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1771 pmr->mld2r_resv1 = 0; 1772 pmr->mld2r_cksum = 0; 1773 pmr->mld2r_resv2 = 0; 1774 pmr->mld2r_ngrec = 0; 1775 return skb; 1776 } 1777 1778 static void mld_sendpack(struct sk_buff *skb) 1779 { 1780 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1781 struct mld2_report *pmr = 1782 (struct mld2_report *)skb_transport_header(skb); 1783 int payload_len, mldlen; 1784 struct inet6_dev *idev; 1785 struct net *net = dev_net(skb->dev); 1786 int err; 1787 struct flowi6 fl6; 1788 struct dst_entry *dst; 1789 1790 rcu_read_lock(); 1791 idev = __in6_dev_get(skb->dev); 1792 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1793 1794 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1795 sizeof(*pip6); 1796 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1797 pip6->payload_len = htons(payload_len); 1798 1799 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1800 IPPROTO_ICMPV6, 1801 csum_partial(skb_transport_header(skb), 1802 mldlen, 0)); 1803 1804 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1805 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1806 skb->dev->ifindex); 1807 dst = icmp6_dst_alloc(skb->dev, &fl6); 1808 1809 err = 0; 1810 if (IS_ERR(dst)) { 1811 err = PTR_ERR(dst); 1812 dst = NULL; 1813 } 1814 skb_dst_set(skb, dst); 1815 if (err) 1816 goto err_out; 1817 1818 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1819 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1820 dst_output); 1821 out: 1822 if (!err) { 1823 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1824 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1825 } else { 1826 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1827 } 1828 1829 rcu_read_unlock(); 1830 return; 1831 1832 err_out: 1833 kfree_skb(skb); 1834 goto out; 1835 } 1836 1837 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1838 { 1839 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1840 } 1841 1842 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1843 int type, struct mld2_grec **ppgr, unsigned int mtu) 1844 { 1845 struct mld2_report *pmr; 1846 struct mld2_grec *pgr; 1847 1848 if (!skb) { 1849 skb = mld_newpack(pmc->idev, mtu); 1850 if (!skb) 1851 return NULL; 1852 } 1853 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1854 pgr->grec_type = type; 1855 pgr->grec_auxwords = 0; 1856 pgr->grec_nsrcs = 0; 1857 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1858 pmr = (struct mld2_report *)skb_transport_header(skb); 1859 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1860 *ppgr = pgr; 1861 return skb; 1862 } 1863 1864 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1865 1866 /* called with mc_lock */ 1867 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1868 int type, int gdeleted, int sdeleted, 1869 int crsend) 1870 { 1871 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1872 int scount, stotal, first, isquery, truncate; 1873 struct ip6_sf_list __rcu **psf_list; 1874 struct inet6_dev *idev = pmc->idev; 1875 struct net_device *dev = idev->dev; 1876 struct mld2_grec *pgr = NULL; 1877 struct mld2_report *pmr; 1878 unsigned int mtu; 1879 1880 if (pmc->mca_flags & MAF_NOREPORT) 1881 return skb; 1882 1883 mtu = READ_ONCE(dev->mtu); 1884 if (mtu < IPV6_MIN_MTU) 1885 return skb; 1886 1887 isquery = type == MLD2_MODE_IS_INCLUDE || 1888 type == MLD2_MODE_IS_EXCLUDE; 1889 truncate = type == MLD2_MODE_IS_EXCLUDE || 1890 type == MLD2_CHANGE_TO_EXCLUDE; 1891 1892 stotal = scount = 0; 1893 1894 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1895 1896 if (!rcu_access_pointer(*psf_list)) 1897 goto empty_source; 1898 1899 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1900 1901 /* EX and TO_EX get a fresh packet, if needed */ 1902 if (truncate) { 1903 if (pmr && pmr->mld2r_ngrec && 1904 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1905 if (skb) 1906 mld_sendpack(skb); 1907 skb = mld_newpack(idev, mtu); 1908 } 1909 } 1910 first = 1; 1911 psf_prev = NULL; 1912 for (psf = mc_dereference(*psf_list, idev); 1913 psf; 1914 psf = psf_next) { 1915 struct in6_addr *psrc; 1916 1917 psf_next = mc_dereference(psf->sf_next, idev); 1918 1919 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1920 psf_prev = psf; 1921 continue; 1922 } 1923 1924 /* Based on RFC3810 6.1. Should not send source-list change 1925 * records when there is a filter mode change. 1926 */ 1927 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1928 (!gdeleted && pmc->mca_crcount)) && 1929 (type == MLD2_ALLOW_NEW_SOURCES || 1930 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1931 goto decrease_sf_crcount; 1932 1933 /* clear marks on query responses */ 1934 if (isquery) 1935 psf->sf_gsresp = 0; 1936 1937 if (AVAILABLE(skb) < sizeof(*psrc) + 1938 first*sizeof(struct mld2_grec)) { 1939 if (truncate && !first) 1940 break; /* truncate these */ 1941 if (pgr) 1942 pgr->grec_nsrcs = htons(scount); 1943 if (skb) 1944 mld_sendpack(skb); 1945 skb = mld_newpack(idev, mtu); 1946 first = 1; 1947 scount = 0; 1948 } 1949 if (first) { 1950 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1951 first = 0; 1952 } 1953 if (!skb) 1954 return NULL; 1955 psrc = skb_put(skb, sizeof(*psrc)); 1956 *psrc = psf->sf_addr; 1957 scount++; stotal++; 1958 if ((type == MLD2_ALLOW_NEW_SOURCES || 1959 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1960 decrease_sf_crcount: 1961 psf->sf_crcount--; 1962 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1963 if (psf_prev) 1964 rcu_assign_pointer(psf_prev->sf_next, 1965 mc_dereference(psf->sf_next, idev)); 1966 else 1967 rcu_assign_pointer(*psf_list, 1968 mc_dereference(psf->sf_next, idev)); 1969 kfree_rcu(psf, rcu); 1970 continue; 1971 } 1972 } 1973 psf_prev = psf; 1974 } 1975 1976 empty_source: 1977 if (!stotal) { 1978 if (type == MLD2_ALLOW_NEW_SOURCES || 1979 type == MLD2_BLOCK_OLD_SOURCES) 1980 return skb; 1981 if (pmc->mca_crcount || isquery || crsend) { 1982 /* make sure we have room for group header */ 1983 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1984 mld_sendpack(skb); 1985 skb = NULL; /* add_grhead will get a new one */ 1986 } 1987 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1988 } 1989 } 1990 if (pgr) 1991 pgr->grec_nsrcs = htons(scount); 1992 1993 if (isquery) 1994 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1995 return skb; 1996 } 1997 1998 /* called with mc_lock */ 1999 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2000 { 2001 struct sk_buff *skb = NULL; 2002 int type; 2003 2004 if (!pmc) { 2005 for_each_mc_mclock(idev, pmc) { 2006 if (pmc->mca_flags & MAF_NOREPORT) 2007 continue; 2008 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2009 type = MLD2_MODE_IS_EXCLUDE; 2010 else 2011 type = MLD2_MODE_IS_INCLUDE; 2012 skb = add_grec(skb, pmc, type, 0, 0, 0); 2013 } 2014 } else { 2015 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2016 type = MLD2_MODE_IS_EXCLUDE; 2017 else 2018 type = MLD2_MODE_IS_INCLUDE; 2019 skb = add_grec(skb, pmc, type, 0, 0, 0); 2020 } 2021 if (skb) 2022 mld_sendpack(skb); 2023 } 2024 2025 /* 2026 * remove zero-count source records from a source filter list 2027 * called with mc_lock 2028 */ 2029 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2030 { 2031 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2032 2033 psf_prev = NULL; 2034 for (psf = mc_dereference(*ppsf, idev); 2035 psf; 2036 psf = psf_next) { 2037 psf_next = mc_dereference(psf->sf_next, idev); 2038 if (psf->sf_crcount == 0) { 2039 if (psf_prev) 2040 rcu_assign_pointer(psf_prev->sf_next, 2041 mc_dereference(psf->sf_next, idev)); 2042 else 2043 rcu_assign_pointer(*ppsf, 2044 mc_dereference(psf->sf_next, idev)); 2045 kfree_rcu(psf, rcu); 2046 } else { 2047 psf_prev = psf; 2048 } 2049 } 2050 } 2051 2052 /* called with mc_lock */ 2053 static void mld_send_cr(struct inet6_dev *idev) 2054 { 2055 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2056 struct sk_buff *skb = NULL; 2057 int type, dtype; 2058 2059 /* deleted MCA's */ 2060 pmc_prev = NULL; 2061 for (pmc = mc_dereference(idev->mc_tomb, idev); 2062 pmc; 2063 pmc = pmc_next) { 2064 pmc_next = mc_dereference(pmc->next, idev); 2065 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2066 type = MLD2_BLOCK_OLD_SOURCES; 2067 dtype = MLD2_BLOCK_OLD_SOURCES; 2068 skb = add_grec(skb, pmc, type, 1, 0, 0); 2069 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2070 } 2071 if (pmc->mca_crcount) { 2072 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2073 type = MLD2_CHANGE_TO_INCLUDE; 2074 skb = add_grec(skb, pmc, type, 1, 0, 0); 2075 } 2076 pmc->mca_crcount--; 2077 if (pmc->mca_crcount == 0) { 2078 mld_clear_zeros(&pmc->mca_tomb, idev); 2079 mld_clear_zeros(&pmc->mca_sources, idev); 2080 } 2081 } 2082 if (pmc->mca_crcount == 0 && 2083 !rcu_access_pointer(pmc->mca_tomb) && 2084 !rcu_access_pointer(pmc->mca_sources)) { 2085 if (pmc_prev) 2086 rcu_assign_pointer(pmc_prev->next, pmc_next); 2087 else 2088 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2089 in6_dev_put(pmc->idev); 2090 kfree_rcu(pmc, rcu); 2091 } else 2092 pmc_prev = pmc; 2093 } 2094 2095 /* change recs */ 2096 for_each_mc_mclock(idev, pmc) { 2097 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2098 type = MLD2_BLOCK_OLD_SOURCES; 2099 dtype = MLD2_ALLOW_NEW_SOURCES; 2100 } else { 2101 type = MLD2_ALLOW_NEW_SOURCES; 2102 dtype = MLD2_BLOCK_OLD_SOURCES; 2103 } 2104 skb = add_grec(skb, pmc, type, 0, 0, 0); 2105 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2106 2107 /* filter mode changes */ 2108 if (pmc->mca_crcount) { 2109 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2110 type = MLD2_CHANGE_TO_EXCLUDE; 2111 else 2112 type = MLD2_CHANGE_TO_INCLUDE; 2113 skb = add_grec(skb, pmc, type, 0, 0, 0); 2114 pmc->mca_crcount--; 2115 } 2116 } 2117 if (!skb) 2118 return; 2119 (void) mld_sendpack(skb); 2120 } 2121 2122 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2123 { 2124 struct net *net = dev_net(dev); 2125 struct sock *sk = net->ipv6.igmp_sk; 2126 struct inet6_dev *idev; 2127 struct sk_buff *skb; 2128 struct mld_msg *hdr; 2129 const struct in6_addr *snd_addr, *saddr; 2130 struct in6_addr addr_buf; 2131 int hlen = LL_RESERVED_SPACE(dev); 2132 int tlen = dev->needed_tailroom; 2133 int err, len, payload_len, full_len; 2134 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2135 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2136 IPV6_TLV_PADN, 0 }; 2137 struct flowi6 fl6; 2138 struct dst_entry *dst; 2139 2140 if (type == ICMPV6_MGM_REDUCTION) 2141 snd_addr = &in6addr_linklocal_allrouters; 2142 else 2143 snd_addr = addr; 2144 2145 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2146 payload_len = len + sizeof(ra); 2147 full_len = sizeof(struct ipv6hdr) + payload_len; 2148 2149 rcu_read_lock(); 2150 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 2151 IPSTATS_MIB_OUT, full_len); 2152 rcu_read_unlock(); 2153 2154 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2155 2156 if (!skb) { 2157 rcu_read_lock(); 2158 IP6_INC_STATS(net, __in6_dev_get(dev), 2159 IPSTATS_MIB_OUTDISCARDS); 2160 rcu_read_unlock(); 2161 return; 2162 } 2163 skb->priority = TC_PRIO_CONTROL; 2164 skb_reserve(skb, hlen); 2165 2166 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2167 /* <draft-ietf-magma-mld-source-05.txt>: 2168 * use unspecified address as the source address 2169 * when a valid link-local address is not available. 2170 */ 2171 saddr = &in6addr_any; 2172 } else 2173 saddr = &addr_buf; 2174 2175 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2176 2177 skb_put_data(skb, ra, sizeof(ra)); 2178 2179 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2180 hdr->mld_type = type; 2181 hdr->mld_mca = *addr; 2182 2183 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2184 IPPROTO_ICMPV6, 2185 csum_partial(hdr, len, 0)); 2186 2187 rcu_read_lock(); 2188 idev = __in6_dev_get(skb->dev); 2189 2190 icmpv6_flow_init(sk, &fl6, type, 2191 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2192 skb->dev->ifindex); 2193 dst = icmp6_dst_alloc(skb->dev, &fl6); 2194 if (IS_ERR(dst)) { 2195 err = PTR_ERR(dst); 2196 goto err_out; 2197 } 2198 2199 skb_dst_set(skb, dst); 2200 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2201 net, sk, skb, NULL, skb->dev, 2202 dst_output); 2203 out: 2204 if (!err) { 2205 ICMP6MSGOUT_INC_STATS(net, idev, type); 2206 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2207 } else 2208 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2209 2210 rcu_read_unlock(); 2211 return; 2212 2213 err_out: 2214 kfree_skb(skb); 2215 goto out; 2216 } 2217 2218 /* called with mc_lock */ 2219 static void mld_send_initial_cr(struct inet6_dev *idev) 2220 { 2221 struct sk_buff *skb; 2222 struct ifmcaddr6 *pmc; 2223 int type; 2224 2225 if (mld_in_v1_mode(idev)) 2226 return; 2227 2228 skb = NULL; 2229 for_each_mc_mclock(idev, pmc) { 2230 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2231 type = MLD2_CHANGE_TO_EXCLUDE; 2232 else 2233 type = MLD2_ALLOW_NEW_SOURCES; 2234 skb = add_grec(skb, pmc, type, 0, 0, 1); 2235 } 2236 if (skb) 2237 mld_sendpack(skb); 2238 } 2239 2240 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2241 { 2242 mutex_lock(&idev->mc_lock); 2243 idev->mc_dad_count = idev->mc_qrv; 2244 if (idev->mc_dad_count) { 2245 mld_send_initial_cr(idev); 2246 idev->mc_dad_count--; 2247 if (idev->mc_dad_count) 2248 mld_dad_start_work(idev, 2249 unsolicited_report_interval(idev)); 2250 } 2251 mutex_unlock(&idev->mc_lock); 2252 } 2253 2254 static void mld_dad_work(struct work_struct *work) 2255 { 2256 struct inet6_dev *idev = container_of(to_delayed_work(work), 2257 struct inet6_dev, 2258 mc_dad_work); 2259 mutex_lock(&idev->mc_lock); 2260 mld_send_initial_cr(idev); 2261 if (idev->mc_dad_count) { 2262 idev->mc_dad_count--; 2263 if (idev->mc_dad_count) 2264 mld_dad_start_work(idev, 2265 unsolicited_report_interval(idev)); 2266 } 2267 mutex_unlock(&idev->mc_lock); 2268 in6_dev_put(idev); 2269 } 2270 2271 /* called with mc_lock */ 2272 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2273 const struct in6_addr *psfsrc) 2274 { 2275 struct ip6_sf_list *psf, *psf_prev; 2276 int rv = 0; 2277 2278 psf_prev = NULL; 2279 for_each_psf_mclock(pmc, psf) { 2280 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2281 break; 2282 psf_prev = psf; 2283 } 2284 if (!psf || psf->sf_count[sfmode] == 0) { 2285 /* source filter not found, or count wrong => bug */ 2286 return -ESRCH; 2287 } 2288 psf->sf_count[sfmode]--; 2289 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2290 struct inet6_dev *idev = pmc->idev; 2291 2292 /* no more filters for this source */ 2293 if (psf_prev) 2294 rcu_assign_pointer(psf_prev->sf_next, 2295 mc_dereference(psf->sf_next, idev)); 2296 else 2297 rcu_assign_pointer(pmc->mca_sources, 2298 mc_dereference(psf->sf_next, idev)); 2299 2300 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2301 !mld_in_v1_mode(idev)) { 2302 psf->sf_crcount = idev->mc_qrv; 2303 rcu_assign_pointer(psf->sf_next, 2304 mc_dereference(pmc->mca_tomb, idev)); 2305 rcu_assign_pointer(pmc->mca_tomb, psf); 2306 rv = 1; 2307 } else { 2308 kfree_rcu(psf, rcu); 2309 } 2310 } 2311 return rv; 2312 } 2313 2314 /* called with mc_lock */ 2315 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2316 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2317 int delta) 2318 { 2319 struct ifmcaddr6 *pmc; 2320 int changerec = 0; 2321 int i, err; 2322 2323 if (!idev) 2324 return -ENODEV; 2325 2326 for_each_mc_mclock(idev, pmc) { 2327 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2328 break; 2329 } 2330 if (!pmc) 2331 return -ESRCH; 2332 2333 sf_markstate(pmc); 2334 if (!delta) { 2335 if (!pmc->mca_sfcount[sfmode]) 2336 return -EINVAL; 2337 2338 pmc->mca_sfcount[sfmode]--; 2339 } 2340 err = 0; 2341 for (i = 0; i < sfcount; i++) { 2342 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2343 2344 changerec |= rv > 0; 2345 if (!err && rv < 0) 2346 err = rv; 2347 } 2348 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2349 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2350 pmc->mca_sfcount[MCAST_INCLUDE]) { 2351 struct ip6_sf_list *psf; 2352 2353 /* filter mode change */ 2354 pmc->mca_sfmode = MCAST_INCLUDE; 2355 pmc->mca_crcount = idev->mc_qrv; 2356 idev->mc_ifc_count = pmc->mca_crcount; 2357 for_each_psf_mclock(pmc, psf) 2358 psf->sf_crcount = 0; 2359 mld_ifc_event(pmc->idev); 2360 } else if (sf_setstate(pmc) || changerec) { 2361 mld_ifc_event(pmc->idev); 2362 } 2363 2364 return err; 2365 } 2366 2367 /* 2368 * Add multicast single-source filter to the interface list 2369 * called with mc_lock 2370 */ 2371 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2372 const struct in6_addr *psfsrc) 2373 { 2374 struct ip6_sf_list *psf, *psf_prev; 2375 2376 psf_prev = NULL; 2377 for_each_psf_mclock(pmc, psf) { 2378 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2379 break; 2380 psf_prev = psf; 2381 } 2382 if (!psf) { 2383 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2384 if (!psf) 2385 return -ENOBUFS; 2386 2387 psf->sf_addr = *psfsrc; 2388 if (psf_prev) { 2389 rcu_assign_pointer(psf_prev->sf_next, psf); 2390 } else { 2391 rcu_assign_pointer(pmc->mca_sources, psf); 2392 } 2393 } 2394 psf->sf_count[sfmode]++; 2395 return 0; 2396 } 2397 2398 /* called with mc_lock */ 2399 static void sf_markstate(struct ifmcaddr6 *pmc) 2400 { 2401 struct ip6_sf_list *psf; 2402 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2403 2404 for_each_psf_mclock(pmc, psf) { 2405 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2406 psf->sf_oldin = mca_xcount == 2407 psf->sf_count[MCAST_EXCLUDE] && 2408 !psf->sf_count[MCAST_INCLUDE]; 2409 } else { 2410 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2411 } 2412 } 2413 } 2414 2415 /* called with mc_lock */ 2416 static int sf_setstate(struct ifmcaddr6 *pmc) 2417 { 2418 struct ip6_sf_list *psf, *dpsf; 2419 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2420 int qrv = pmc->idev->mc_qrv; 2421 int new_in, rv; 2422 2423 rv = 0; 2424 for_each_psf_mclock(pmc, psf) { 2425 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2426 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2427 !psf->sf_count[MCAST_INCLUDE]; 2428 } else 2429 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2430 if (new_in) { 2431 if (!psf->sf_oldin) { 2432 struct ip6_sf_list *prev = NULL; 2433 2434 for_each_psf_tomb(pmc, dpsf) { 2435 if (ipv6_addr_equal(&dpsf->sf_addr, 2436 &psf->sf_addr)) 2437 break; 2438 prev = dpsf; 2439 } 2440 if (dpsf) { 2441 if (prev) 2442 rcu_assign_pointer(prev->sf_next, 2443 mc_dereference(dpsf->sf_next, 2444 pmc->idev)); 2445 else 2446 rcu_assign_pointer(pmc->mca_tomb, 2447 mc_dereference(dpsf->sf_next, 2448 pmc->idev)); 2449 kfree_rcu(dpsf, rcu); 2450 } 2451 psf->sf_crcount = qrv; 2452 rv++; 2453 } 2454 } else if (psf->sf_oldin) { 2455 psf->sf_crcount = 0; 2456 /* 2457 * add or update "delete" records if an active filter 2458 * is now inactive 2459 */ 2460 2461 for_each_psf_tomb(pmc, dpsf) 2462 if (ipv6_addr_equal(&dpsf->sf_addr, 2463 &psf->sf_addr)) 2464 break; 2465 if (!dpsf) { 2466 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2467 if (!dpsf) 2468 continue; 2469 *dpsf = *psf; 2470 rcu_assign_pointer(dpsf->sf_next, 2471 mc_dereference(pmc->mca_tomb, pmc->idev)); 2472 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2473 } 2474 dpsf->sf_crcount = qrv; 2475 rv++; 2476 } 2477 } 2478 return rv; 2479 } 2480 2481 /* 2482 * Add multicast source filter list to the interface list 2483 * called with mc_lock 2484 */ 2485 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2486 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2487 int delta) 2488 { 2489 struct ifmcaddr6 *pmc; 2490 int isexclude; 2491 int i, err; 2492 2493 if (!idev) 2494 return -ENODEV; 2495 2496 for_each_mc_mclock(idev, pmc) { 2497 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2498 break; 2499 } 2500 if (!pmc) 2501 return -ESRCH; 2502 2503 sf_markstate(pmc); 2504 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2505 if (!delta) 2506 pmc->mca_sfcount[sfmode]++; 2507 err = 0; 2508 for (i = 0; i < sfcount; i++) { 2509 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2510 if (err) 2511 break; 2512 } 2513 if (err) { 2514 int j; 2515 2516 if (!delta) 2517 pmc->mca_sfcount[sfmode]--; 2518 for (j = 0; j < i; j++) 2519 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2520 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2521 struct ip6_sf_list *psf; 2522 2523 /* filter mode change */ 2524 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2525 pmc->mca_sfmode = MCAST_EXCLUDE; 2526 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2527 pmc->mca_sfmode = MCAST_INCLUDE; 2528 /* else no filters; keep old mode for reports */ 2529 2530 pmc->mca_crcount = idev->mc_qrv; 2531 idev->mc_ifc_count = pmc->mca_crcount; 2532 for_each_psf_mclock(pmc, psf) 2533 psf->sf_crcount = 0; 2534 mld_ifc_event(idev); 2535 } else if (sf_setstate(pmc)) { 2536 mld_ifc_event(idev); 2537 } 2538 return err; 2539 } 2540 2541 /* called with mc_lock */ 2542 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2543 { 2544 struct ip6_sf_list *psf, *nextpsf; 2545 2546 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2547 psf; 2548 psf = nextpsf) { 2549 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2550 kfree_rcu(psf, rcu); 2551 } 2552 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2553 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2554 psf; 2555 psf = nextpsf) { 2556 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2557 kfree_rcu(psf, rcu); 2558 } 2559 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2560 pmc->mca_sfmode = MCAST_EXCLUDE; 2561 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2562 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2563 } 2564 2565 /* called with mc_lock */ 2566 static void igmp6_join_group(struct ifmcaddr6 *ma) 2567 { 2568 unsigned long delay; 2569 2570 if (ma->mca_flags & MAF_NOREPORT) 2571 return; 2572 2573 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2574 2575 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2576 2577 if (cancel_delayed_work(&ma->mca_work)) { 2578 refcount_dec(&ma->mca_refcnt); 2579 delay = ma->mca_work.timer.expires - jiffies; 2580 } 2581 2582 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2583 refcount_inc(&ma->mca_refcnt); 2584 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2585 } 2586 2587 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2588 struct inet6_dev *idev) 2589 { 2590 struct ip6_sf_socklist *psl; 2591 int err; 2592 2593 psl = sock_dereference(iml->sflist, sk); 2594 2595 if (idev) 2596 mutex_lock(&idev->mc_lock); 2597 2598 if (!psl) { 2599 /* any-source empty exclude case */ 2600 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2601 } else { 2602 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2603 psl->sl_count, psl->sl_addr, 0); 2604 RCU_INIT_POINTER(iml->sflist, NULL); 2605 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2606 &sk->sk_omem_alloc); 2607 kfree_rcu(psl, rcu); 2608 } 2609 2610 if (idev) 2611 mutex_unlock(&idev->mc_lock); 2612 2613 return err; 2614 } 2615 2616 /* called with mc_lock */ 2617 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2618 { 2619 if (mld_in_v1_mode(ma->idev)) { 2620 if (ma->mca_flags & MAF_LAST_REPORTER) { 2621 igmp6_send(&ma->mca_addr, ma->idev->dev, 2622 ICMPV6_MGM_REDUCTION); 2623 } 2624 } else { 2625 mld_add_delrec(ma->idev, ma); 2626 mld_ifc_event(ma->idev); 2627 } 2628 } 2629 2630 static void mld_gq_work(struct work_struct *work) 2631 { 2632 struct inet6_dev *idev = container_of(to_delayed_work(work), 2633 struct inet6_dev, 2634 mc_gq_work); 2635 2636 mutex_lock(&idev->mc_lock); 2637 mld_send_report(idev, NULL); 2638 idev->mc_gq_running = 0; 2639 mutex_unlock(&idev->mc_lock); 2640 2641 in6_dev_put(idev); 2642 } 2643 2644 static void mld_ifc_work(struct work_struct *work) 2645 { 2646 struct inet6_dev *idev = container_of(to_delayed_work(work), 2647 struct inet6_dev, 2648 mc_ifc_work); 2649 2650 mutex_lock(&idev->mc_lock); 2651 mld_send_cr(idev); 2652 2653 if (idev->mc_ifc_count) { 2654 idev->mc_ifc_count--; 2655 if (idev->mc_ifc_count) 2656 mld_ifc_start_work(idev, 2657 unsolicited_report_interval(idev)); 2658 } 2659 mutex_unlock(&idev->mc_lock); 2660 in6_dev_put(idev); 2661 } 2662 2663 /* called with mc_lock */ 2664 static void mld_ifc_event(struct inet6_dev *idev) 2665 { 2666 if (mld_in_v1_mode(idev)) 2667 return; 2668 2669 idev->mc_ifc_count = idev->mc_qrv; 2670 mld_ifc_start_work(idev, 1); 2671 } 2672 2673 static void mld_mca_work(struct work_struct *work) 2674 { 2675 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2676 struct ifmcaddr6, mca_work); 2677 2678 mutex_lock(&ma->idev->mc_lock); 2679 if (mld_in_v1_mode(ma->idev)) 2680 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2681 else 2682 mld_send_report(ma->idev, ma); 2683 ma->mca_flags |= MAF_LAST_REPORTER; 2684 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2685 mutex_unlock(&ma->idev->mc_lock); 2686 2687 ma_put(ma); 2688 } 2689 2690 /* Device changing type */ 2691 2692 void ipv6_mc_unmap(struct inet6_dev *idev) 2693 { 2694 struct ifmcaddr6 *i; 2695 2696 /* Install multicast list, except for all-nodes (already installed) */ 2697 2698 mutex_lock(&idev->mc_lock); 2699 for_each_mc_mclock(idev, i) 2700 igmp6_group_dropped(i); 2701 mutex_unlock(&idev->mc_lock); 2702 } 2703 2704 void ipv6_mc_remap(struct inet6_dev *idev) 2705 { 2706 ipv6_mc_up(idev); 2707 } 2708 2709 /* Device going down */ 2710 void ipv6_mc_down(struct inet6_dev *idev) 2711 { 2712 struct ifmcaddr6 *i; 2713 2714 mutex_lock(&idev->mc_lock); 2715 /* Withdraw multicast list */ 2716 for_each_mc_mclock(idev, i) 2717 igmp6_group_dropped(i); 2718 mutex_unlock(&idev->mc_lock); 2719 2720 /* Should stop work after group drop. or we will 2721 * start work again in mld_ifc_event() 2722 */ 2723 synchronize_net(); 2724 mld_query_stop_work(idev); 2725 mld_report_stop_work(idev); 2726 mld_ifc_stop_work(idev); 2727 mld_gq_stop_work(idev); 2728 mld_dad_stop_work(idev); 2729 } 2730 2731 static void ipv6_mc_reset(struct inet6_dev *idev) 2732 { 2733 idev->mc_qrv = sysctl_mld_qrv; 2734 idev->mc_qi = MLD_QI_DEFAULT; 2735 idev->mc_qri = MLD_QRI_DEFAULT; 2736 idev->mc_v1_seen = 0; 2737 idev->mc_maxdelay = unsolicited_report_interval(idev); 2738 } 2739 2740 /* Device going up */ 2741 2742 void ipv6_mc_up(struct inet6_dev *idev) 2743 { 2744 struct ifmcaddr6 *i; 2745 2746 /* Install multicast list, except for all-nodes (already installed) */ 2747 2748 ipv6_mc_reset(idev); 2749 mutex_lock(&idev->mc_lock); 2750 for_each_mc_mclock(idev, i) { 2751 mld_del_delrec(idev, i); 2752 igmp6_group_added(i); 2753 } 2754 mutex_unlock(&idev->mc_lock); 2755 } 2756 2757 /* IPv6 device initialization. */ 2758 2759 void ipv6_mc_init_dev(struct inet6_dev *idev) 2760 { 2761 idev->mc_gq_running = 0; 2762 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2763 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2764 idev->mc_ifc_count = 0; 2765 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2766 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2767 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2768 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2769 skb_queue_head_init(&idev->mc_query_queue); 2770 skb_queue_head_init(&idev->mc_report_queue); 2771 spin_lock_init(&idev->mc_query_lock); 2772 spin_lock_init(&idev->mc_report_lock); 2773 mutex_init(&idev->mc_lock); 2774 ipv6_mc_reset(idev); 2775 } 2776 2777 /* 2778 * Device is about to be destroyed: clean up. 2779 */ 2780 2781 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2782 { 2783 struct ifmcaddr6 *i; 2784 2785 /* Deactivate works */ 2786 ipv6_mc_down(idev); 2787 mutex_lock(&idev->mc_lock); 2788 mld_clear_delrec(idev); 2789 mutex_unlock(&idev->mc_lock); 2790 mld_clear_query(idev); 2791 mld_clear_report(idev); 2792 2793 /* Delete all-nodes address. */ 2794 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2795 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2796 * fail. 2797 */ 2798 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2799 2800 if (idev->cnf.forwarding) 2801 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2802 2803 mutex_lock(&idev->mc_lock); 2804 while ((i = mc_dereference(idev->mc_list, idev))) { 2805 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2806 2807 ip6_mc_clear_src(i); 2808 ma_put(i); 2809 } 2810 mutex_unlock(&idev->mc_lock); 2811 } 2812 2813 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2814 { 2815 struct ifmcaddr6 *pmc; 2816 2817 ASSERT_RTNL(); 2818 2819 mutex_lock(&idev->mc_lock); 2820 if (mld_in_v1_mode(idev)) { 2821 for_each_mc_mclock(idev, pmc) 2822 igmp6_join_group(pmc); 2823 } else { 2824 mld_send_report(idev, NULL); 2825 } 2826 mutex_unlock(&idev->mc_lock); 2827 } 2828 2829 static int ipv6_mc_netdev_event(struct notifier_block *this, 2830 unsigned long event, 2831 void *ptr) 2832 { 2833 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2834 struct inet6_dev *idev = __in6_dev_get(dev); 2835 2836 switch (event) { 2837 case NETDEV_RESEND_IGMP: 2838 if (idev) 2839 ipv6_mc_rejoin_groups(idev); 2840 break; 2841 default: 2842 break; 2843 } 2844 2845 return NOTIFY_DONE; 2846 } 2847 2848 static struct notifier_block igmp6_netdev_notifier = { 2849 .notifier_call = ipv6_mc_netdev_event, 2850 }; 2851 2852 #ifdef CONFIG_PROC_FS 2853 struct igmp6_mc_iter_state { 2854 struct seq_net_private p; 2855 struct net_device *dev; 2856 struct inet6_dev *idev; 2857 }; 2858 2859 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2860 2861 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2862 { 2863 struct ifmcaddr6 *im = NULL; 2864 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2865 struct net *net = seq_file_net(seq); 2866 2867 state->idev = NULL; 2868 for_each_netdev_rcu(net, state->dev) { 2869 struct inet6_dev *idev; 2870 idev = __in6_dev_get(state->dev); 2871 if (!idev) 2872 continue; 2873 2874 im = rcu_dereference(idev->mc_list); 2875 if (im) { 2876 state->idev = idev; 2877 break; 2878 } 2879 } 2880 return im; 2881 } 2882 2883 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2884 { 2885 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2886 2887 im = rcu_dereference(im->next); 2888 while (!im) { 2889 state->dev = next_net_device_rcu(state->dev); 2890 if (!state->dev) { 2891 state->idev = NULL; 2892 break; 2893 } 2894 state->idev = __in6_dev_get(state->dev); 2895 if (!state->idev) 2896 continue; 2897 im = rcu_dereference(state->idev->mc_list); 2898 } 2899 return im; 2900 } 2901 2902 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2903 { 2904 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2905 if (im) 2906 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2907 --pos; 2908 return pos ? NULL : im; 2909 } 2910 2911 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2912 __acquires(RCU) 2913 { 2914 rcu_read_lock(); 2915 return igmp6_mc_get_idx(seq, *pos); 2916 } 2917 2918 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2919 { 2920 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2921 2922 ++*pos; 2923 return im; 2924 } 2925 2926 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2927 __releases(RCU) 2928 { 2929 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2930 2931 if (likely(state->idev)) 2932 state->idev = NULL; 2933 state->dev = NULL; 2934 rcu_read_unlock(); 2935 } 2936 2937 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2938 { 2939 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2940 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2941 2942 seq_printf(seq, 2943 "%-4d %-15s %pi6 %5d %08X %ld\n", 2944 state->dev->ifindex, state->dev->name, 2945 &im->mca_addr, 2946 im->mca_users, im->mca_flags, 2947 (im->mca_flags & MAF_TIMER_RUNNING) ? 2948 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2949 return 0; 2950 } 2951 2952 static const struct seq_operations igmp6_mc_seq_ops = { 2953 .start = igmp6_mc_seq_start, 2954 .next = igmp6_mc_seq_next, 2955 .stop = igmp6_mc_seq_stop, 2956 .show = igmp6_mc_seq_show, 2957 }; 2958 2959 struct igmp6_mcf_iter_state { 2960 struct seq_net_private p; 2961 struct net_device *dev; 2962 struct inet6_dev *idev; 2963 struct ifmcaddr6 *im; 2964 }; 2965 2966 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2967 2968 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2969 { 2970 struct ip6_sf_list *psf = NULL; 2971 struct ifmcaddr6 *im = NULL; 2972 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2973 struct net *net = seq_file_net(seq); 2974 2975 state->idev = NULL; 2976 state->im = NULL; 2977 for_each_netdev_rcu(net, state->dev) { 2978 struct inet6_dev *idev; 2979 idev = __in6_dev_get(state->dev); 2980 if (unlikely(idev == NULL)) 2981 continue; 2982 2983 im = rcu_dereference(idev->mc_list); 2984 if (likely(im)) { 2985 psf = rcu_dereference(im->mca_sources); 2986 if (likely(psf)) { 2987 state->im = im; 2988 state->idev = idev; 2989 break; 2990 } 2991 } 2992 } 2993 return psf; 2994 } 2995 2996 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2997 { 2998 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2999 3000 psf = rcu_dereference(psf->sf_next); 3001 while (!psf) { 3002 state->im = rcu_dereference(state->im->next); 3003 while (!state->im) { 3004 state->dev = next_net_device_rcu(state->dev); 3005 if (!state->dev) { 3006 state->idev = NULL; 3007 goto out; 3008 } 3009 state->idev = __in6_dev_get(state->dev); 3010 if (!state->idev) 3011 continue; 3012 state->im = rcu_dereference(state->idev->mc_list); 3013 } 3014 if (!state->im) 3015 break; 3016 psf = rcu_dereference(state->im->mca_sources); 3017 } 3018 out: 3019 return psf; 3020 } 3021 3022 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3023 { 3024 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3025 if (psf) 3026 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3027 --pos; 3028 return pos ? NULL : psf; 3029 } 3030 3031 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3032 __acquires(RCU) 3033 { 3034 rcu_read_lock(); 3035 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3036 } 3037 3038 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3039 { 3040 struct ip6_sf_list *psf; 3041 if (v == SEQ_START_TOKEN) 3042 psf = igmp6_mcf_get_first(seq); 3043 else 3044 psf = igmp6_mcf_get_next(seq, v); 3045 ++*pos; 3046 return psf; 3047 } 3048 3049 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3050 __releases(RCU) 3051 { 3052 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3053 3054 if (likely(state->im)) 3055 state->im = NULL; 3056 if (likely(state->idev)) 3057 state->idev = NULL; 3058 3059 state->dev = NULL; 3060 rcu_read_unlock(); 3061 } 3062 3063 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3064 { 3065 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3066 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3067 3068 if (v == SEQ_START_TOKEN) { 3069 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3070 } else { 3071 seq_printf(seq, 3072 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3073 state->dev->ifindex, state->dev->name, 3074 &state->im->mca_addr, 3075 &psf->sf_addr, 3076 psf->sf_count[MCAST_INCLUDE], 3077 psf->sf_count[MCAST_EXCLUDE]); 3078 } 3079 return 0; 3080 } 3081 3082 static const struct seq_operations igmp6_mcf_seq_ops = { 3083 .start = igmp6_mcf_seq_start, 3084 .next = igmp6_mcf_seq_next, 3085 .stop = igmp6_mcf_seq_stop, 3086 .show = igmp6_mcf_seq_show, 3087 }; 3088 3089 static int __net_init igmp6_proc_init(struct net *net) 3090 { 3091 int err; 3092 3093 err = -ENOMEM; 3094 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3095 sizeof(struct igmp6_mc_iter_state))) 3096 goto out; 3097 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3098 &igmp6_mcf_seq_ops, 3099 sizeof(struct igmp6_mcf_iter_state))) 3100 goto out_proc_net_igmp6; 3101 3102 err = 0; 3103 out: 3104 return err; 3105 3106 out_proc_net_igmp6: 3107 remove_proc_entry("igmp6", net->proc_net); 3108 goto out; 3109 } 3110 3111 static void __net_exit igmp6_proc_exit(struct net *net) 3112 { 3113 remove_proc_entry("mcfilter6", net->proc_net); 3114 remove_proc_entry("igmp6", net->proc_net); 3115 } 3116 #else 3117 static inline int igmp6_proc_init(struct net *net) 3118 { 3119 return 0; 3120 } 3121 static inline void igmp6_proc_exit(struct net *net) 3122 { 3123 } 3124 #endif 3125 3126 static int __net_init igmp6_net_init(struct net *net) 3127 { 3128 int err; 3129 3130 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3131 SOCK_RAW, IPPROTO_ICMPV6, net); 3132 if (err < 0) { 3133 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3134 err); 3135 goto out; 3136 } 3137 3138 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3139 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3140 3141 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3142 SOCK_RAW, IPPROTO_ICMPV6, net); 3143 if (err < 0) { 3144 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3145 err); 3146 goto out_sock_create; 3147 } 3148 3149 err = igmp6_proc_init(net); 3150 if (err) 3151 goto out_sock_create_autojoin; 3152 3153 return 0; 3154 3155 out_sock_create_autojoin: 3156 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3157 out_sock_create: 3158 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3159 out: 3160 return err; 3161 } 3162 3163 static void __net_exit igmp6_net_exit(struct net *net) 3164 { 3165 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3166 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3167 igmp6_proc_exit(net); 3168 } 3169 3170 static struct pernet_operations igmp6_net_ops = { 3171 .init = igmp6_net_init, 3172 .exit = igmp6_net_exit, 3173 }; 3174 3175 int __init igmp6_init(void) 3176 { 3177 int err; 3178 3179 err = register_pernet_subsys(&igmp6_net_ops); 3180 if (err) 3181 return err; 3182 3183 mld_wq = create_workqueue("mld"); 3184 if (!mld_wq) { 3185 unregister_pernet_subsys(&igmp6_net_ops); 3186 return -ENOMEM; 3187 } 3188 3189 return err; 3190 } 3191 3192 int __init igmp6_late_init(void) 3193 { 3194 return register_netdevice_notifier(&igmp6_netdev_notifier); 3195 } 3196 3197 void igmp6_cleanup(void) 3198 { 3199 unregister_pernet_subsys(&igmp6_net_ops); 3200 destroy_workqueue(mld_wq); 3201 } 3202 3203 void igmp6_late_cleanup(void) 3204 { 3205 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3206 } 3207