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 break; 1526 } 1527 } 1528 spin_unlock_bh(&idev->mc_query_lock); 1529 1530 mutex_lock(&idev->mc_lock); 1531 while ((skb = __skb_dequeue(&q))) 1532 __mld_query_work(skb); 1533 mutex_unlock(&idev->mc_lock); 1534 1535 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1536 return; 1537 1538 in6_dev_put(idev); 1539 } 1540 1541 /* called with rcu_read_lock() */ 1542 void igmp6_event_report(struct sk_buff *skb) 1543 { 1544 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1545 1546 if (!idev || idev->dead) 1547 goto out; 1548 1549 spin_lock_bh(&idev->mc_report_lock); 1550 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1551 __skb_queue_tail(&idev->mc_report_queue, skb); 1552 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1553 in6_dev_hold(idev); 1554 skb = NULL; 1555 } 1556 spin_unlock_bh(&idev->mc_report_lock); 1557 out: 1558 kfree_skb(skb); 1559 } 1560 1561 static void __mld_report_work(struct sk_buff *skb) 1562 { 1563 struct inet6_dev *idev; 1564 struct ifmcaddr6 *ma; 1565 struct mld_msg *mld; 1566 int addr_type; 1567 1568 /* Our own report looped back. Ignore it. */ 1569 if (skb->pkt_type == PACKET_LOOPBACK) 1570 goto kfree_skb; 1571 1572 /* send our report if the MC router may not have heard this report */ 1573 if (skb->pkt_type != PACKET_MULTICAST && 1574 skb->pkt_type != PACKET_BROADCAST) 1575 goto kfree_skb; 1576 1577 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1578 goto kfree_skb; 1579 1580 mld = (struct mld_msg *)icmp6_hdr(skb); 1581 1582 /* Drop reports with not link local source */ 1583 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1584 if (addr_type != IPV6_ADDR_ANY && 1585 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1586 goto kfree_skb; 1587 1588 idev = in6_dev_get(skb->dev); 1589 if (!idev) 1590 goto kfree_skb; 1591 1592 /* 1593 * Cancel the work for this group 1594 */ 1595 1596 for_each_mc_mclock(idev, ma) { 1597 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1598 if (cancel_delayed_work(&ma->mca_work)) 1599 refcount_dec(&ma->mca_refcnt); 1600 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1601 MAF_TIMER_RUNNING); 1602 break; 1603 } 1604 } 1605 1606 in6_dev_put(idev); 1607 kfree_skb: 1608 consume_skb(skb); 1609 } 1610 1611 static void mld_report_work(struct work_struct *work) 1612 { 1613 struct inet6_dev *idev = container_of(to_delayed_work(work), 1614 struct inet6_dev, 1615 mc_report_work); 1616 struct sk_buff_head q; 1617 struct sk_buff *skb; 1618 bool rework = false; 1619 int cnt = 0; 1620 1621 skb_queue_head_init(&q); 1622 spin_lock_bh(&idev->mc_report_lock); 1623 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1624 __skb_queue_tail(&q, skb); 1625 1626 if (++cnt >= MLD_MAX_QUEUE) { 1627 rework = true; 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 && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1639 return; 1640 1641 in6_dev_put(idev); 1642 } 1643 1644 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1645 int gdeleted, int sdeleted) 1646 { 1647 switch (type) { 1648 case MLD2_MODE_IS_INCLUDE: 1649 case MLD2_MODE_IS_EXCLUDE: 1650 if (gdeleted || sdeleted) 1651 return false; 1652 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1653 if (pmc->mca_sfmode == MCAST_INCLUDE) 1654 return true; 1655 /* don't include if this source is excluded 1656 * in all filters 1657 */ 1658 if (psf->sf_count[MCAST_INCLUDE]) 1659 return type == MLD2_MODE_IS_INCLUDE; 1660 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1661 psf->sf_count[MCAST_EXCLUDE]; 1662 } 1663 return false; 1664 case MLD2_CHANGE_TO_INCLUDE: 1665 if (gdeleted || sdeleted) 1666 return false; 1667 return psf->sf_count[MCAST_INCLUDE] != 0; 1668 case MLD2_CHANGE_TO_EXCLUDE: 1669 if (gdeleted || sdeleted) 1670 return false; 1671 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1672 psf->sf_count[MCAST_INCLUDE]) 1673 return false; 1674 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1675 psf->sf_count[MCAST_EXCLUDE]; 1676 case MLD2_ALLOW_NEW_SOURCES: 1677 if (gdeleted || !psf->sf_crcount) 1678 return false; 1679 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1680 case MLD2_BLOCK_OLD_SOURCES: 1681 if (pmc->mca_sfmode == MCAST_INCLUDE) 1682 return gdeleted || (psf->sf_crcount && sdeleted); 1683 return psf->sf_crcount && !gdeleted && !sdeleted; 1684 } 1685 return false; 1686 } 1687 1688 static int 1689 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1690 { 1691 struct ip6_sf_list *psf; 1692 int scount = 0; 1693 1694 for_each_psf_mclock(pmc, psf) { 1695 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1696 continue; 1697 scount++; 1698 } 1699 return scount; 1700 } 1701 1702 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1703 struct net_device *dev, 1704 const struct in6_addr *saddr, 1705 const struct in6_addr *daddr, 1706 int proto, int len) 1707 { 1708 struct ipv6hdr *hdr; 1709 1710 skb->protocol = htons(ETH_P_IPV6); 1711 skb->dev = dev; 1712 1713 skb_reset_network_header(skb); 1714 skb_put(skb, sizeof(struct ipv6hdr)); 1715 hdr = ipv6_hdr(skb); 1716 1717 ip6_flow_hdr(hdr, 0, 0); 1718 1719 hdr->payload_len = htons(len); 1720 hdr->nexthdr = proto; 1721 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1722 1723 hdr->saddr = *saddr; 1724 hdr->daddr = *daddr; 1725 } 1726 1727 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1728 { 1729 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1730 2, 0, 0, IPV6_TLV_PADN, 0 }; 1731 struct net_device *dev = idev->dev; 1732 int hlen = LL_RESERVED_SPACE(dev); 1733 int tlen = dev->needed_tailroom; 1734 struct net *net = dev_net(dev); 1735 const struct in6_addr *saddr; 1736 struct in6_addr addr_buf; 1737 struct mld2_report *pmr; 1738 struct sk_buff *skb; 1739 unsigned int size; 1740 struct sock *sk; 1741 int err; 1742 1743 sk = net->ipv6.igmp_sk; 1744 /* we assume size > sizeof(ra) here 1745 * Also try to not allocate high-order pages for big MTU 1746 */ 1747 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1748 skb = sock_alloc_send_skb(sk, size, 1, &err); 1749 if (!skb) 1750 return NULL; 1751 1752 skb->priority = TC_PRIO_CONTROL; 1753 skb_reserve(skb, hlen); 1754 skb_tailroom_reserve(skb, mtu, tlen); 1755 1756 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1757 /* <draft-ietf-magma-mld-source-05.txt>: 1758 * use unspecified address as the source address 1759 * when a valid link-local address is not available. 1760 */ 1761 saddr = &in6addr_any; 1762 } else 1763 saddr = &addr_buf; 1764 1765 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1766 1767 skb_put_data(skb, ra, sizeof(ra)); 1768 1769 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1770 skb_put(skb, sizeof(*pmr)); 1771 pmr = (struct mld2_report *)skb_transport_header(skb); 1772 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1773 pmr->mld2r_resv1 = 0; 1774 pmr->mld2r_cksum = 0; 1775 pmr->mld2r_resv2 = 0; 1776 pmr->mld2r_ngrec = 0; 1777 return skb; 1778 } 1779 1780 static void mld_sendpack(struct sk_buff *skb) 1781 { 1782 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1783 struct mld2_report *pmr = 1784 (struct mld2_report *)skb_transport_header(skb); 1785 int payload_len, mldlen; 1786 struct inet6_dev *idev; 1787 struct net *net = dev_net(skb->dev); 1788 int err; 1789 struct flowi6 fl6; 1790 struct dst_entry *dst; 1791 1792 rcu_read_lock(); 1793 idev = __in6_dev_get(skb->dev); 1794 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1795 1796 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1797 sizeof(*pip6); 1798 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1799 pip6->payload_len = htons(payload_len); 1800 1801 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1802 IPPROTO_ICMPV6, 1803 csum_partial(skb_transport_header(skb), 1804 mldlen, 0)); 1805 1806 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1807 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1808 skb->dev->ifindex); 1809 dst = icmp6_dst_alloc(skb->dev, &fl6); 1810 1811 err = 0; 1812 if (IS_ERR(dst)) { 1813 err = PTR_ERR(dst); 1814 dst = NULL; 1815 } 1816 skb_dst_set(skb, dst); 1817 if (err) 1818 goto err_out; 1819 1820 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1821 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1822 dst_output); 1823 out: 1824 if (!err) { 1825 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1826 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1827 } else { 1828 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1829 } 1830 1831 rcu_read_unlock(); 1832 return; 1833 1834 err_out: 1835 kfree_skb(skb); 1836 goto out; 1837 } 1838 1839 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1840 { 1841 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1842 } 1843 1844 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1845 int type, struct mld2_grec **ppgr, unsigned int mtu) 1846 { 1847 struct mld2_report *pmr; 1848 struct mld2_grec *pgr; 1849 1850 if (!skb) { 1851 skb = mld_newpack(pmc->idev, mtu); 1852 if (!skb) 1853 return NULL; 1854 } 1855 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1856 pgr->grec_type = type; 1857 pgr->grec_auxwords = 0; 1858 pgr->grec_nsrcs = 0; 1859 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1860 pmr = (struct mld2_report *)skb_transport_header(skb); 1861 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1862 *ppgr = pgr; 1863 return skb; 1864 } 1865 1866 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1867 1868 /* called with mc_lock */ 1869 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1870 int type, int gdeleted, int sdeleted, 1871 int crsend) 1872 { 1873 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1874 int scount, stotal, first, isquery, truncate; 1875 struct ip6_sf_list __rcu **psf_list; 1876 struct inet6_dev *idev = pmc->idev; 1877 struct net_device *dev = idev->dev; 1878 struct mld2_grec *pgr = NULL; 1879 struct mld2_report *pmr; 1880 unsigned int mtu; 1881 1882 if (pmc->mca_flags & MAF_NOREPORT) 1883 return skb; 1884 1885 mtu = READ_ONCE(dev->mtu); 1886 if (mtu < IPV6_MIN_MTU) 1887 return skb; 1888 1889 isquery = type == MLD2_MODE_IS_INCLUDE || 1890 type == MLD2_MODE_IS_EXCLUDE; 1891 truncate = type == MLD2_MODE_IS_EXCLUDE || 1892 type == MLD2_CHANGE_TO_EXCLUDE; 1893 1894 stotal = scount = 0; 1895 1896 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1897 1898 if (!rcu_access_pointer(*psf_list)) 1899 goto empty_source; 1900 1901 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1902 1903 /* EX and TO_EX get a fresh packet, if needed */ 1904 if (truncate) { 1905 if (pmr && pmr->mld2r_ngrec && 1906 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1907 if (skb) 1908 mld_sendpack(skb); 1909 skb = mld_newpack(idev, mtu); 1910 } 1911 } 1912 first = 1; 1913 psf_prev = NULL; 1914 for (psf = mc_dereference(*psf_list, idev); 1915 psf; 1916 psf = psf_next) { 1917 struct in6_addr *psrc; 1918 1919 psf_next = mc_dereference(psf->sf_next, idev); 1920 1921 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1922 psf_prev = psf; 1923 continue; 1924 } 1925 1926 /* Based on RFC3810 6.1. Should not send source-list change 1927 * records when there is a filter mode change. 1928 */ 1929 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1930 (!gdeleted && pmc->mca_crcount)) && 1931 (type == MLD2_ALLOW_NEW_SOURCES || 1932 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1933 goto decrease_sf_crcount; 1934 1935 /* clear marks on query responses */ 1936 if (isquery) 1937 psf->sf_gsresp = 0; 1938 1939 if (AVAILABLE(skb) < sizeof(*psrc) + 1940 first*sizeof(struct mld2_grec)) { 1941 if (truncate && !first) 1942 break; /* truncate these */ 1943 if (pgr) 1944 pgr->grec_nsrcs = htons(scount); 1945 if (skb) 1946 mld_sendpack(skb); 1947 skb = mld_newpack(idev, mtu); 1948 first = 1; 1949 scount = 0; 1950 } 1951 if (first) { 1952 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1953 first = 0; 1954 } 1955 if (!skb) 1956 return NULL; 1957 psrc = skb_put(skb, sizeof(*psrc)); 1958 *psrc = psf->sf_addr; 1959 scount++; stotal++; 1960 if ((type == MLD2_ALLOW_NEW_SOURCES || 1961 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1962 decrease_sf_crcount: 1963 psf->sf_crcount--; 1964 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1965 if (psf_prev) 1966 rcu_assign_pointer(psf_prev->sf_next, 1967 mc_dereference(psf->sf_next, idev)); 1968 else 1969 rcu_assign_pointer(*psf_list, 1970 mc_dereference(psf->sf_next, idev)); 1971 kfree_rcu(psf, rcu); 1972 continue; 1973 } 1974 } 1975 psf_prev = psf; 1976 } 1977 1978 empty_source: 1979 if (!stotal) { 1980 if (type == MLD2_ALLOW_NEW_SOURCES || 1981 type == MLD2_BLOCK_OLD_SOURCES) 1982 return skb; 1983 if (pmc->mca_crcount || isquery || crsend) { 1984 /* make sure we have room for group header */ 1985 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1986 mld_sendpack(skb); 1987 skb = NULL; /* add_grhead will get a new one */ 1988 } 1989 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1990 } 1991 } 1992 if (pgr) 1993 pgr->grec_nsrcs = htons(scount); 1994 1995 if (isquery) 1996 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1997 return skb; 1998 } 1999 2000 /* called with mc_lock */ 2001 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2002 { 2003 struct sk_buff *skb = NULL; 2004 int type; 2005 2006 if (!pmc) { 2007 for_each_mc_mclock(idev, pmc) { 2008 if (pmc->mca_flags & MAF_NOREPORT) 2009 continue; 2010 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2011 type = MLD2_MODE_IS_EXCLUDE; 2012 else 2013 type = MLD2_MODE_IS_INCLUDE; 2014 skb = add_grec(skb, pmc, type, 0, 0, 0); 2015 } 2016 } else { 2017 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2018 type = MLD2_MODE_IS_EXCLUDE; 2019 else 2020 type = MLD2_MODE_IS_INCLUDE; 2021 skb = add_grec(skb, pmc, type, 0, 0, 0); 2022 } 2023 if (skb) 2024 mld_sendpack(skb); 2025 } 2026 2027 /* 2028 * remove zero-count source records from a source filter list 2029 * called with mc_lock 2030 */ 2031 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2032 { 2033 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2034 2035 psf_prev = NULL; 2036 for (psf = mc_dereference(*ppsf, idev); 2037 psf; 2038 psf = psf_next) { 2039 psf_next = mc_dereference(psf->sf_next, idev); 2040 if (psf->sf_crcount == 0) { 2041 if (psf_prev) 2042 rcu_assign_pointer(psf_prev->sf_next, 2043 mc_dereference(psf->sf_next, idev)); 2044 else 2045 rcu_assign_pointer(*ppsf, 2046 mc_dereference(psf->sf_next, idev)); 2047 kfree_rcu(psf, rcu); 2048 } else { 2049 psf_prev = psf; 2050 } 2051 } 2052 } 2053 2054 /* called with mc_lock */ 2055 static void mld_send_cr(struct inet6_dev *idev) 2056 { 2057 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2058 struct sk_buff *skb = NULL; 2059 int type, dtype; 2060 2061 /* deleted MCA's */ 2062 pmc_prev = NULL; 2063 for (pmc = mc_dereference(idev->mc_tomb, idev); 2064 pmc; 2065 pmc = pmc_next) { 2066 pmc_next = mc_dereference(pmc->next, idev); 2067 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2068 type = MLD2_BLOCK_OLD_SOURCES; 2069 dtype = MLD2_BLOCK_OLD_SOURCES; 2070 skb = add_grec(skb, pmc, type, 1, 0, 0); 2071 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2072 } 2073 if (pmc->mca_crcount) { 2074 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2075 type = MLD2_CHANGE_TO_INCLUDE; 2076 skb = add_grec(skb, pmc, type, 1, 0, 0); 2077 } 2078 pmc->mca_crcount--; 2079 if (pmc->mca_crcount == 0) { 2080 mld_clear_zeros(&pmc->mca_tomb, idev); 2081 mld_clear_zeros(&pmc->mca_sources, idev); 2082 } 2083 } 2084 if (pmc->mca_crcount == 0 && 2085 !rcu_access_pointer(pmc->mca_tomb) && 2086 !rcu_access_pointer(pmc->mca_sources)) { 2087 if (pmc_prev) 2088 rcu_assign_pointer(pmc_prev->next, pmc_next); 2089 else 2090 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2091 in6_dev_put(pmc->idev); 2092 kfree_rcu(pmc, rcu); 2093 } else 2094 pmc_prev = pmc; 2095 } 2096 2097 /* change recs */ 2098 for_each_mc_mclock(idev, pmc) { 2099 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2100 type = MLD2_BLOCK_OLD_SOURCES; 2101 dtype = MLD2_ALLOW_NEW_SOURCES; 2102 } else { 2103 type = MLD2_ALLOW_NEW_SOURCES; 2104 dtype = MLD2_BLOCK_OLD_SOURCES; 2105 } 2106 skb = add_grec(skb, pmc, type, 0, 0, 0); 2107 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2108 2109 /* filter mode changes */ 2110 if (pmc->mca_crcount) { 2111 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2112 type = MLD2_CHANGE_TO_EXCLUDE; 2113 else 2114 type = MLD2_CHANGE_TO_INCLUDE; 2115 skb = add_grec(skb, pmc, type, 0, 0, 0); 2116 pmc->mca_crcount--; 2117 } 2118 } 2119 if (!skb) 2120 return; 2121 (void) mld_sendpack(skb); 2122 } 2123 2124 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2125 { 2126 struct net *net = dev_net(dev); 2127 struct sock *sk = net->ipv6.igmp_sk; 2128 struct inet6_dev *idev; 2129 struct sk_buff *skb; 2130 struct mld_msg *hdr; 2131 const struct in6_addr *snd_addr, *saddr; 2132 struct in6_addr addr_buf; 2133 int hlen = LL_RESERVED_SPACE(dev); 2134 int tlen = dev->needed_tailroom; 2135 int err, len, payload_len, full_len; 2136 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2137 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2138 IPV6_TLV_PADN, 0 }; 2139 struct flowi6 fl6; 2140 struct dst_entry *dst; 2141 2142 if (type == ICMPV6_MGM_REDUCTION) 2143 snd_addr = &in6addr_linklocal_allrouters; 2144 else 2145 snd_addr = addr; 2146 2147 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2148 payload_len = len + sizeof(ra); 2149 full_len = sizeof(struct ipv6hdr) + payload_len; 2150 2151 rcu_read_lock(); 2152 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 2153 IPSTATS_MIB_OUT, full_len); 2154 rcu_read_unlock(); 2155 2156 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2157 2158 if (!skb) { 2159 rcu_read_lock(); 2160 IP6_INC_STATS(net, __in6_dev_get(dev), 2161 IPSTATS_MIB_OUTDISCARDS); 2162 rcu_read_unlock(); 2163 return; 2164 } 2165 skb->priority = TC_PRIO_CONTROL; 2166 skb_reserve(skb, hlen); 2167 2168 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2169 /* <draft-ietf-magma-mld-source-05.txt>: 2170 * use unspecified address as the source address 2171 * when a valid link-local address is not available. 2172 */ 2173 saddr = &in6addr_any; 2174 } else 2175 saddr = &addr_buf; 2176 2177 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2178 2179 skb_put_data(skb, ra, sizeof(ra)); 2180 2181 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2182 hdr->mld_type = type; 2183 hdr->mld_mca = *addr; 2184 2185 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2186 IPPROTO_ICMPV6, 2187 csum_partial(hdr, len, 0)); 2188 2189 rcu_read_lock(); 2190 idev = __in6_dev_get(skb->dev); 2191 2192 icmpv6_flow_init(sk, &fl6, type, 2193 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2194 skb->dev->ifindex); 2195 dst = icmp6_dst_alloc(skb->dev, &fl6); 2196 if (IS_ERR(dst)) { 2197 err = PTR_ERR(dst); 2198 goto err_out; 2199 } 2200 2201 skb_dst_set(skb, dst); 2202 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2203 net, sk, skb, NULL, skb->dev, 2204 dst_output); 2205 out: 2206 if (!err) { 2207 ICMP6MSGOUT_INC_STATS(net, idev, type); 2208 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2209 } else 2210 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2211 2212 rcu_read_unlock(); 2213 return; 2214 2215 err_out: 2216 kfree_skb(skb); 2217 goto out; 2218 } 2219 2220 /* called with mc_lock */ 2221 static void mld_send_initial_cr(struct inet6_dev *idev) 2222 { 2223 struct sk_buff *skb; 2224 struct ifmcaddr6 *pmc; 2225 int type; 2226 2227 if (mld_in_v1_mode(idev)) 2228 return; 2229 2230 skb = NULL; 2231 for_each_mc_mclock(idev, pmc) { 2232 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2233 type = MLD2_CHANGE_TO_EXCLUDE; 2234 else 2235 type = MLD2_ALLOW_NEW_SOURCES; 2236 skb = add_grec(skb, pmc, type, 0, 0, 1); 2237 } 2238 if (skb) 2239 mld_sendpack(skb); 2240 } 2241 2242 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2243 { 2244 mutex_lock(&idev->mc_lock); 2245 idev->mc_dad_count = idev->mc_qrv; 2246 if (idev->mc_dad_count) { 2247 mld_send_initial_cr(idev); 2248 idev->mc_dad_count--; 2249 if (idev->mc_dad_count) 2250 mld_dad_start_work(idev, 2251 unsolicited_report_interval(idev)); 2252 } 2253 mutex_unlock(&idev->mc_lock); 2254 } 2255 2256 static void mld_dad_work(struct work_struct *work) 2257 { 2258 struct inet6_dev *idev = container_of(to_delayed_work(work), 2259 struct inet6_dev, 2260 mc_dad_work); 2261 mutex_lock(&idev->mc_lock); 2262 mld_send_initial_cr(idev); 2263 if (idev->mc_dad_count) { 2264 idev->mc_dad_count--; 2265 if (idev->mc_dad_count) 2266 mld_dad_start_work(idev, 2267 unsolicited_report_interval(idev)); 2268 } 2269 mutex_unlock(&idev->mc_lock); 2270 in6_dev_put(idev); 2271 } 2272 2273 /* called with mc_lock */ 2274 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2275 const struct in6_addr *psfsrc) 2276 { 2277 struct ip6_sf_list *psf, *psf_prev; 2278 int rv = 0; 2279 2280 psf_prev = NULL; 2281 for_each_psf_mclock(pmc, psf) { 2282 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2283 break; 2284 psf_prev = psf; 2285 } 2286 if (!psf || psf->sf_count[sfmode] == 0) { 2287 /* source filter not found, or count wrong => bug */ 2288 return -ESRCH; 2289 } 2290 psf->sf_count[sfmode]--; 2291 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2292 struct inet6_dev *idev = pmc->idev; 2293 2294 /* no more filters for this source */ 2295 if (psf_prev) 2296 rcu_assign_pointer(psf_prev->sf_next, 2297 mc_dereference(psf->sf_next, idev)); 2298 else 2299 rcu_assign_pointer(pmc->mca_sources, 2300 mc_dereference(psf->sf_next, idev)); 2301 2302 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2303 !mld_in_v1_mode(idev)) { 2304 psf->sf_crcount = idev->mc_qrv; 2305 rcu_assign_pointer(psf->sf_next, 2306 mc_dereference(pmc->mca_tomb, idev)); 2307 rcu_assign_pointer(pmc->mca_tomb, psf); 2308 rv = 1; 2309 } else { 2310 kfree_rcu(psf, rcu); 2311 } 2312 } 2313 return rv; 2314 } 2315 2316 /* called with mc_lock */ 2317 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2318 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2319 int delta) 2320 { 2321 struct ifmcaddr6 *pmc; 2322 int changerec = 0; 2323 int i, err; 2324 2325 if (!idev) 2326 return -ENODEV; 2327 2328 for_each_mc_mclock(idev, pmc) { 2329 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2330 break; 2331 } 2332 if (!pmc) 2333 return -ESRCH; 2334 2335 sf_markstate(pmc); 2336 if (!delta) { 2337 if (!pmc->mca_sfcount[sfmode]) 2338 return -EINVAL; 2339 2340 pmc->mca_sfcount[sfmode]--; 2341 } 2342 err = 0; 2343 for (i = 0; i < sfcount; i++) { 2344 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2345 2346 changerec |= rv > 0; 2347 if (!err && rv < 0) 2348 err = rv; 2349 } 2350 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2351 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2352 pmc->mca_sfcount[MCAST_INCLUDE]) { 2353 struct ip6_sf_list *psf; 2354 2355 /* filter mode change */ 2356 pmc->mca_sfmode = MCAST_INCLUDE; 2357 pmc->mca_crcount = idev->mc_qrv; 2358 idev->mc_ifc_count = pmc->mca_crcount; 2359 for_each_psf_mclock(pmc, psf) 2360 psf->sf_crcount = 0; 2361 mld_ifc_event(pmc->idev); 2362 } else if (sf_setstate(pmc) || changerec) { 2363 mld_ifc_event(pmc->idev); 2364 } 2365 2366 return err; 2367 } 2368 2369 /* 2370 * Add multicast single-source filter to the interface list 2371 * called with mc_lock 2372 */ 2373 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2374 const struct in6_addr *psfsrc) 2375 { 2376 struct ip6_sf_list *psf, *psf_prev; 2377 2378 psf_prev = NULL; 2379 for_each_psf_mclock(pmc, psf) { 2380 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2381 break; 2382 psf_prev = psf; 2383 } 2384 if (!psf) { 2385 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2386 if (!psf) 2387 return -ENOBUFS; 2388 2389 psf->sf_addr = *psfsrc; 2390 if (psf_prev) { 2391 rcu_assign_pointer(psf_prev->sf_next, psf); 2392 } else { 2393 rcu_assign_pointer(pmc->mca_sources, psf); 2394 } 2395 } 2396 psf->sf_count[sfmode]++; 2397 return 0; 2398 } 2399 2400 /* called with mc_lock */ 2401 static void sf_markstate(struct ifmcaddr6 *pmc) 2402 { 2403 struct ip6_sf_list *psf; 2404 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2405 2406 for_each_psf_mclock(pmc, psf) { 2407 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2408 psf->sf_oldin = mca_xcount == 2409 psf->sf_count[MCAST_EXCLUDE] && 2410 !psf->sf_count[MCAST_INCLUDE]; 2411 } else { 2412 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2413 } 2414 } 2415 } 2416 2417 /* called with mc_lock */ 2418 static int sf_setstate(struct ifmcaddr6 *pmc) 2419 { 2420 struct ip6_sf_list *psf, *dpsf; 2421 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2422 int qrv = pmc->idev->mc_qrv; 2423 int new_in, rv; 2424 2425 rv = 0; 2426 for_each_psf_mclock(pmc, psf) { 2427 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2428 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2429 !psf->sf_count[MCAST_INCLUDE]; 2430 } else 2431 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2432 if (new_in) { 2433 if (!psf->sf_oldin) { 2434 struct ip6_sf_list *prev = NULL; 2435 2436 for_each_psf_tomb(pmc, dpsf) { 2437 if (ipv6_addr_equal(&dpsf->sf_addr, 2438 &psf->sf_addr)) 2439 break; 2440 prev = dpsf; 2441 } 2442 if (dpsf) { 2443 if (prev) 2444 rcu_assign_pointer(prev->sf_next, 2445 mc_dereference(dpsf->sf_next, 2446 pmc->idev)); 2447 else 2448 rcu_assign_pointer(pmc->mca_tomb, 2449 mc_dereference(dpsf->sf_next, 2450 pmc->idev)); 2451 kfree_rcu(dpsf, rcu); 2452 } 2453 psf->sf_crcount = qrv; 2454 rv++; 2455 } 2456 } else if (psf->sf_oldin) { 2457 psf->sf_crcount = 0; 2458 /* 2459 * add or update "delete" records if an active filter 2460 * is now inactive 2461 */ 2462 2463 for_each_psf_tomb(pmc, dpsf) 2464 if (ipv6_addr_equal(&dpsf->sf_addr, 2465 &psf->sf_addr)) 2466 break; 2467 if (!dpsf) { 2468 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2469 if (!dpsf) 2470 continue; 2471 *dpsf = *psf; 2472 rcu_assign_pointer(dpsf->sf_next, 2473 mc_dereference(pmc->mca_tomb, pmc->idev)); 2474 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2475 } 2476 dpsf->sf_crcount = qrv; 2477 rv++; 2478 } 2479 } 2480 return rv; 2481 } 2482 2483 /* 2484 * Add multicast source filter list to the interface list 2485 * called with mc_lock 2486 */ 2487 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2488 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2489 int delta) 2490 { 2491 struct ifmcaddr6 *pmc; 2492 int isexclude; 2493 int i, err; 2494 2495 if (!idev) 2496 return -ENODEV; 2497 2498 for_each_mc_mclock(idev, pmc) { 2499 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2500 break; 2501 } 2502 if (!pmc) 2503 return -ESRCH; 2504 2505 sf_markstate(pmc); 2506 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2507 if (!delta) 2508 pmc->mca_sfcount[sfmode]++; 2509 err = 0; 2510 for (i = 0; i < sfcount; i++) { 2511 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2512 if (err) 2513 break; 2514 } 2515 if (err) { 2516 int j; 2517 2518 if (!delta) 2519 pmc->mca_sfcount[sfmode]--; 2520 for (j = 0; j < i; j++) 2521 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2522 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2523 struct ip6_sf_list *psf; 2524 2525 /* filter mode change */ 2526 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2527 pmc->mca_sfmode = MCAST_EXCLUDE; 2528 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2529 pmc->mca_sfmode = MCAST_INCLUDE; 2530 /* else no filters; keep old mode for reports */ 2531 2532 pmc->mca_crcount = idev->mc_qrv; 2533 idev->mc_ifc_count = pmc->mca_crcount; 2534 for_each_psf_mclock(pmc, psf) 2535 psf->sf_crcount = 0; 2536 mld_ifc_event(idev); 2537 } else if (sf_setstate(pmc)) { 2538 mld_ifc_event(idev); 2539 } 2540 return err; 2541 } 2542 2543 /* called with mc_lock */ 2544 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2545 { 2546 struct ip6_sf_list *psf, *nextpsf; 2547 2548 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2549 psf; 2550 psf = nextpsf) { 2551 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2552 kfree_rcu(psf, rcu); 2553 } 2554 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2555 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2556 psf; 2557 psf = nextpsf) { 2558 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2559 kfree_rcu(psf, rcu); 2560 } 2561 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2562 pmc->mca_sfmode = MCAST_EXCLUDE; 2563 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2564 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2565 } 2566 2567 /* called with mc_lock */ 2568 static void igmp6_join_group(struct ifmcaddr6 *ma) 2569 { 2570 unsigned long delay; 2571 2572 if (ma->mca_flags & MAF_NOREPORT) 2573 return; 2574 2575 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2576 2577 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2578 2579 if (cancel_delayed_work(&ma->mca_work)) { 2580 refcount_dec(&ma->mca_refcnt); 2581 delay = ma->mca_work.timer.expires - jiffies; 2582 } 2583 2584 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2585 refcount_inc(&ma->mca_refcnt); 2586 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2587 } 2588 2589 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2590 struct inet6_dev *idev) 2591 { 2592 struct ip6_sf_socklist *psl; 2593 int err; 2594 2595 psl = sock_dereference(iml->sflist, sk); 2596 2597 if (idev) 2598 mutex_lock(&idev->mc_lock); 2599 2600 if (!psl) { 2601 /* any-source empty exclude case */ 2602 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2603 } else { 2604 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2605 psl->sl_count, psl->sl_addr, 0); 2606 RCU_INIT_POINTER(iml->sflist, NULL); 2607 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2608 &sk->sk_omem_alloc); 2609 kfree_rcu(psl, rcu); 2610 } 2611 2612 if (idev) 2613 mutex_unlock(&idev->mc_lock); 2614 2615 return err; 2616 } 2617 2618 /* called with mc_lock */ 2619 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2620 { 2621 if (mld_in_v1_mode(ma->idev)) { 2622 if (ma->mca_flags & MAF_LAST_REPORTER) { 2623 igmp6_send(&ma->mca_addr, ma->idev->dev, 2624 ICMPV6_MGM_REDUCTION); 2625 } 2626 } else { 2627 mld_add_delrec(ma->idev, ma); 2628 mld_ifc_event(ma->idev); 2629 } 2630 } 2631 2632 static void mld_gq_work(struct work_struct *work) 2633 { 2634 struct inet6_dev *idev = container_of(to_delayed_work(work), 2635 struct inet6_dev, 2636 mc_gq_work); 2637 2638 mutex_lock(&idev->mc_lock); 2639 mld_send_report(idev, NULL); 2640 idev->mc_gq_running = 0; 2641 mutex_unlock(&idev->mc_lock); 2642 2643 in6_dev_put(idev); 2644 } 2645 2646 static void mld_ifc_work(struct work_struct *work) 2647 { 2648 struct inet6_dev *idev = container_of(to_delayed_work(work), 2649 struct inet6_dev, 2650 mc_ifc_work); 2651 2652 mutex_lock(&idev->mc_lock); 2653 mld_send_cr(idev); 2654 2655 if (idev->mc_ifc_count) { 2656 idev->mc_ifc_count--; 2657 if (idev->mc_ifc_count) 2658 mld_ifc_start_work(idev, 2659 unsolicited_report_interval(idev)); 2660 } 2661 mutex_unlock(&idev->mc_lock); 2662 in6_dev_put(idev); 2663 } 2664 2665 /* called with mc_lock */ 2666 static void mld_ifc_event(struct inet6_dev *idev) 2667 { 2668 if (mld_in_v1_mode(idev)) 2669 return; 2670 2671 idev->mc_ifc_count = idev->mc_qrv; 2672 mld_ifc_start_work(idev, 1); 2673 } 2674 2675 static void mld_mca_work(struct work_struct *work) 2676 { 2677 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2678 struct ifmcaddr6, mca_work); 2679 2680 mutex_lock(&ma->idev->mc_lock); 2681 if (mld_in_v1_mode(ma->idev)) 2682 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2683 else 2684 mld_send_report(ma->idev, ma); 2685 ma->mca_flags |= MAF_LAST_REPORTER; 2686 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2687 mutex_unlock(&ma->idev->mc_lock); 2688 2689 ma_put(ma); 2690 } 2691 2692 /* Device changing type */ 2693 2694 void ipv6_mc_unmap(struct inet6_dev *idev) 2695 { 2696 struct ifmcaddr6 *i; 2697 2698 /* Install multicast list, except for all-nodes (already installed) */ 2699 2700 mutex_lock(&idev->mc_lock); 2701 for_each_mc_mclock(idev, i) 2702 igmp6_group_dropped(i); 2703 mutex_unlock(&idev->mc_lock); 2704 } 2705 2706 void ipv6_mc_remap(struct inet6_dev *idev) 2707 { 2708 ipv6_mc_up(idev); 2709 } 2710 2711 /* Device going down */ 2712 void ipv6_mc_down(struct inet6_dev *idev) 2713 { 2714 struct ifmcaddr6 *i; 2715 2716 mutex_lock(&idev->mc_lock); 2717 /* Withdraw multicast list */ 2718 for_each_mc_mclock(idev, i) 2719 igmp6_group_dropped(i); 2720 mutex_unlock(&idev->mc_lock); 2721 2722 /* Should stop work after group drop. or we will 2723 * start work again in mld_ifc_event() 2724 */ 2725 synchronize_net(); 2726 mld_query_stop_work(idev); 2727 mld_report_stop_work(idev); 2728 mld_ifc_stop_work(idev); 2729 mld_gq_stop_work(idev); 2730 mld_dad_stop_work(idev); 2731 } 2732 2733 static void ipv6_mc_reset(struct inet6_dev *idev) 2734 { 2735 idev->mc_qrv = sysctl_mld_qrv; 2736 idev->mc_qi = MLD_QI_DEFAULT; 2737 idev->mc_qri = MLD_QRI_DEFAULT; 2738 idev->mc_v1_seen = 0; 2739 idev->mc_maxdelay = unsolicited_report_interval(idev); 2740 } 2741 2742 /* Device going up */ 2743 2744 void ipv6_mc_up(struct inet6_dev *idev) 2745 { 2746 struct ifmcaddr6 *i; 2747 2748 /* Install multicast list, except for all-nodes (already installed) */ 2749 2750 ipv6_mc_reset(idev); 2751 mutex_lock(&idev->mc_lock); 2752 for_each_mc_mclock(idev, i) { 2753 mld_del_delrec(idev, i); 2754 igmp6_group_added(i); 2755 } 2756 mutex_unlock(&idev->mc_lock); 2757 } 2758 2759 /* IPv6 device initialization. */ 2760 2761 void ipv6_mc_init_dev(struct inet6_dev *idev) 2762 { 2763 idev->mc_gq_running = 0; 2764 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2765 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2766 idev->mc_ifc_count = 0; 2767 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2768 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2769 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2770 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2771 skb_queue_head_init(&idev->mc_query_queue); 2772 skb_queue_head_init(&idev->mc_report_queue); 2773 spin_lock_init(&idev->mc_query_lock); 2774 spin_lock_init(&idev->mc_report_lock); 2775 mutex_init(&idev->mc_lock); 2776 ipv6_mc_reset(idev); 2777 } 2778 2779 /* 2780 * Device is about to be destroyed: clean up. 2781 */ 2782 2783 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2784 { 2785 struct ifmcaddr6 *i; 2786 2787 /* Deactivate works */ 2788 ipv6_mc_down(idev); 2789 mutex_lock(&idev->mc_lock); 2790 mld_clear_delrec(idev); 2791 mutex_unlock(&idev->mc_lock); 2792 mld_clear_query(idev); 2793 mld_clear_report(idev); 2794 2795 /* Delete all-nodes address. */ 2796 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2797 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2798 * fail. 2799 */ 2800 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2801 2802 if (idev->cnf.forwarding) 2803 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2804 2805 mutex_lock(&idev->mc_lock); 2806 while ((i = mc_dereference(idev->mc_list, idev))) { 2807 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2808 2809 ip6_mc_clear_src(i); 2810 ma_put(i); 2811 } 2812 mutex_unlock(&idev->mc_lock); 2813 } 2814 2815 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2816 { 2817 struct ifmcaddr6 *pmc; 2818 2819 ASSERT_RTNL(); 2820 2821 mutex_lock(&idev->mc_lock); 2822 if (mld_in_v1_mode(idev)) { 2823 for_each_mc_mclock(idev, pmc) 2824 igmp6_join_group(pmc); 2825 } else { 2826 mld_send_report(idev, NULL); 2827 } 2828 mutex_unlock(&idev->mc_lock); 2829 } 2830 2831 static int ipv6_mc_netdev_event(struct notifier_block *this, 2832 unsigned long event, 2833 void *ptr) 2834 { 2835 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2836 struct inet6_dev *idev = __in6_dev_get(dev); 2837 2838 switch (event) { 2839 case NETDEV_RESEND_IGMP: 2840 if (idev) 2841 ipv6_mc_rejoin_groups(idev); 2842 break; 2843 default: 2844 break; 2845 } 2846 2847 return NOTIFY_DONE; 2848 } 2849 2850 static struct notifier_block igmp6_netdev_notifier = { 2851 .notifier_call = ipv6_mc_netdev_event, 2852 }; 2853 2854 #ifdef CONFIG_PROC_FS 2855 struct igmp6_mc_iter_state { 2856 struct seq_net_private p; 2857 struct net_device *dev; 2858 struct inet6_dev *idev; 2859 }; 2860 2861 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2862 2863 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2864 { 2865 struct ifmcaddr6 *im = NULL; 2866 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2867 struct net *net = seq_file_net(seq); 2868 2869 state->idev = NULL; 2870 for_each_netdev_rcu(net, state->dev) { 2871 struct inet6_dev *idev; 2872 idev = __in6_dev_get(state->dev); 2873 if (!idev) 2874 continue; 2875 2876 im = rcu_dereference(idev->mc_list); 2877 if (im) { 2878 state->idev = idev; 2879 break; 2880 } 2881 } 2882 return im; 2883 } 2884 2885 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2886 { 2887 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2888 2889 im = rcu_dereference(im->next); 2890 while (!im) { 2891 state->dev = next_net_device_rcu(state->dev); 2892 if (!state->dev) { 2893 state->idev = NULL; 2894 break; 2895 } 2896 state->idev = __in6_dev_get(state->dev); 2897 if (!state->idev) 2898 continue; 2899 im = rcu_dereference(state->idev->mc_list); 2900 } 2901 return im; 2902 } 2903 2904 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2905 { 2906 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2907 if (im) 2908 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2909 --pos; 2910 return pos ? NULL : im; 2911 } 2912 2913 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2914 __acquires(RCU) 2915 { 2916 rcu_read_lock(); 2917 return igmp6_mc_get_idx(seq, *pos); 2918 } 2919 2920 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2921 { 2922 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2923 2924 ++*pos; 2925 return im; 2926 } 2927 2928 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2929 __releases(RCU) 2930 { 2931 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2932 2933 if (likely(state->idev)) 2934 state->idev = NULL; 2935 state->dev = NULL; 2936 rcu_read_unlock(); 2937 } 2938 2939 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2940 { 2941 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2942 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2943 2944 seq_printf(seq, 2945 "%-4d %-15s %pi6 %5d %08X %ld\n", 2946 state->dev->ifindex, state->dev->name, 2947 &im->mca_addr, 2948 im->mca_users, im->mca_flags, 2949 (im->mca_flags & MAF_TIMER_RUNNING) ? 2950 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2951 return 0; 2952 } 2953 2954 static const struct seq_operations igmp6_mc_seq_ops = { 2955 .start = igmp6_mc_seq_start, 2956 .next = igmp6_mc_seq_next, 2957 .stop = igmp6_mc_seq_stop, 2958 .show = igmp6_mc_seq_show, 2959 }; 2960 2961 struct igmp6_mcf_iter_state { 2962 struct seq_net_private p; 2963 struct net_device *dev; 2964 struct inet6_dev *idev; 2965 struct ifmcaddr6 *im; 2966 }; 2967 2968 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2969 2970 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2971 { 2972 struct ip6_sf_list *psf = NULL; 2973 struct ifmcaddr6 *im = NULL; 2974 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2975 struct net *net = seq_file_net(seq); 2976 2977 state->idev = NULL; 2978 state->im = NULL; 2979 for_each_netdev_rcu(net, state->dev) { 2980 struct inet6_dev *idev; 2981 idev = __in6_dev_get(state->dev); 2982 if (unlikely(idev == NULL)) 2983 continue; 2984 2985 im = rcu_dereference(idev->mc_list); 2986 if (likely(im)) { 2987 psf = rcu_dereference(im->mca_sources); 2988 if (likely(psf)) { 2989 state->im = im; 2990 state->idev = idev; 2991 break; 2992 } 2993 } 2994 } 2995 return psf; 2996 } 2997 2998 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2999 { 3000 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3001 3002 psf = rcu_dereference(psf->sf_next); 3003 while (!psf) { 3004 state->im = rcu_dereference(state->im->next); 3005 while (!state->im) { 3006 state->dev = next_net_device_rcu(state->dev); 3007 if (!state->dev) { 3008 state->idev = NULL; 3009 goto out; 3010 } 3011 state->idev = __in6_dev_get(state->dev); 3012 if (!state->idev) 3013 continue; 3014 state->im = rcu_dereference(state->idev->mc_list); 3015 } 3016 if (!state->im) 3017 break; 3018 psf = rcu_dereference(state->im->mca_sources); 3019 } 3020 out: 3021 return psf; 3022 } 3023 3024 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3025 { 3026 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3027 if (psf) 3028 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3029 --pos; 3030 return pos ? NULL : psf; 3031 } 3032 3033 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3034 __acquires(RCU) 3035 { 3036 rcu_read_lock(); 3037 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3038 } 3039 3040 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3041 { 3042 struct ip6_sf_list *psf; 3043 if (v == SEQ_START_TOKEN) 3044 psf = igmp6_mcf_get_first(seq); 3045 else 3046 psf = igmp6_mcf_get_next(seq, v); 3047 ++*pos; 3048 return psf; 3049 } 3050 3051 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3052 __releases(RCU) 3053 { 3054 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3055 3056 if (likely(state->im)) 3057 state->im = NULL; 3058 if (likely(state->idev)) 3059 state->idev = NULL; 3060 3061 state->dev = NULL; 3062 rcu_read_unlock(); 3063 } 3064 3065 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3066 { 3067 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3068 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3069 3070 if (v == SEQ_START_TOKEN) { 3071 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3072 } else { 3073 seq_printf(seq, 3074 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3075 state->dev->ifindex, state->dev->name, 3076 &state->im->mca_addr, 3077 &psf->sf_addr, 3078 psf->sf_count[MCAST_INCLUDE], 3079 psf->sf_count[MCAST_EXCLUDE]); 3080 } 3081 return 0; 3082 } 3083 3084 static const struct seq_operations igmp6_mcf_seq_ops = { 3085 .start = igmp6_mcf_seq_start, 3086 .next = igmp6_mcf_seq_next, 3087 .stop = igmp6_mcf_seq_stop, 3088 .show = igmp6_mcf_seq_show, 3089 }; 3090 3091 static int __net_init igmp6_proc_init(struct net *net) 3092 { 3093 int err; 3094 3095 err = -ENOMEM; 3096 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3097 sizeof(struct igmp6_mc_iter_state))) 3098 goto out; 3099 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3100 &igmp6_mcf_seq_ops, 3101 sizeof(struct igmp6_mcf_iter_state))) 3102 goto out_proc_net_igmp6; 3103 3104 err = 0; 3105 out: 3106 return err; 3107 3108 out_proc_net_igmp6: 3109 remove_proc_entry("igmp6", net->proc_net); 3110 goto out; 3111 } 3112 3113 static void __net_exit igmp6_proc_exit(struct net *net) 3114 { 3115 remove_proc_entry("mcfilter6", net->proc_net); 3116 remove_proc_entry("igmp6", net->proc_net); 3117 } 3118 #else 3119 static inline int igmp6_proc_init(struct net *net) 3120 { 3121 return 0; 3122 } 3123 static inline void igmp6_proc_exit(struct net *net) 3124 { 3125 } 3126 #endif 3127 3128 static int __net_init igmp6_net_init(struct net *net) 3129 { 3130 int err; 3131 3132 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3133 SOCK_RAW, IPPROTO_ICMPV6, net); 3134 if (err < 0) { 3135 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3136 err); 3137 goto out; 3138 } 3139 3140 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3141 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3142 3143 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3144 SOCK_RAW, IPPROTO_ICMPV6, net); 3145 if (err < 0) { 3146 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3147 err); 3148 goto out_sock_create; 3149 } 3150 3151 err = igmp6_proc_init(net); 3152 if (err) 3153 goto out_sock_create_autojoin; 3154 3155 return 0; 3156 3157 out_sock_create_autojoin: 3158 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3159 out_sock_create: 3160 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3161 out: 3162 return err; 3163 } 3164 3165 static void __net_exit igmp6_net_exit(struct net *net) 3166 { 3167 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3168 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3169 igmp6_proc_exit(net); 3170 } 3171 3172 static struct pernet_operations igmp6_net_ops = { 3173 .init = igmp6_net_init, 3174 .exit = igmp6_net_exit, 3175 }; 3176 3177 int __init igmp6_init(void) 3178 { 3179 int err; 3180 3181 err = register_pernet_subsys(&igmp6_net_ops); 3182 if (err) 3183 return err; 3184 3185 mld_wq = create_workqueue("mld"); 3186 if (!mld_wq) { 3187 unregister_pernet_subsys(&igmp6_net_ops); 3188 return -ENOMEM; 3189 } 3190 3191 return err; 3192 } 3193 3194 int __init igmp6_late_init(void) 3195 { 3196 return register_netdevice_notifier(&igmp6_netdev_notifier); 3197 } 3198 3199 void igmp6_cleanup(void) 3200 { 3201 unregister_pernet_subsys(&igmp6_net_ops); 3202 destroy_workqueue(mld_wq); 3203 } 3204 3205 void igmp6_late_cleanup(void) 3206 { 3207 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3208 } 3209