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 = READ_ONCE(idev->cnf.mldv1_unsolicited_report_interval); 163 else 164 iv = READ_ONCE(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 sockptr_t optval, size_t ss_offset) 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 unsigned int count; 590 int i, copycount; 591 592 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 593 594 if (!ipv6_addr_is_multicast(group)) 595 return -EINVAL; 596 597 /* changes to the ipv6_mc_list require the socket lock and 598 * rtnl lock. We have the socket lock, so reading the list is safe. 599 */ 600 601 for_each_pmc_socklock(inet6, sk, pmc) { 602 if (pmc->ifindex != gsf->gf_interface) 603 continue; 604 if (ipv6_addr_equal(group, &pmc->addr)) 605 break; 606 } 607 if (!pmc) /* must have a prior join */ 608 return -EADDRNOTAVAIL; 609 610 gsf->gf_fmode = pmc->sfmode; 611 psl = sock_dereference(pmc->sflist, sk); 612 count = psl ? psl->sl_count : 0; 613 614 copycount = min(count, gsf->gf_numsrc); 615 gsf->gf_numsrc = count; 616 for (i = 0; i < copycount; i++) { 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_sockptr_offset(optval, ss_offset, &ss, sizeof(ss))) 625 return -EFAULT; 626 ss_offset += sizeof(ss); 627 } 628 return 0; 629 } 630 631 bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, 632 const struct in6_addr *src_addr) 633 { 634 const struct ipv6_pinfo *np = inet6_sk(sk); 635 const struct ipv6_mc_socklist *mc; 636 const struct ip6_sf_socklist *psl; 637 bool rv = true; 638 639 rcu_read_lock(); 640 for_each_pmc_rcu(np, mc) { 641 if (ipv6_addr_equal(&mc->addr, mc_addr)) 642 break; 643 } 644 if (!mc) { 645 rcu_read_unlock(); 646 return inet6_test_bit(MC6_ALL, sk); 647 } 648 psl = rcu_dereference(mc->sflist); 649 if (!psl) { 650 rv = mc->sfmode == MCAST_EXCLUDE; 651 } else { 652 int i; 653 654 for (i = 0; i < psl->sl_count; i++) { 655 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 656 break; 657 } 658 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 659 rv = false; 660 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 661 rv = false; 662 } 663 rcu_read_unlock(); 664 665 return rv; 666 } 667 668 /* called with mc_lock */ 669 static void igmp6_group_added(struct ifmcaddr6 *mc) 670 { 671 struct net_device *dev = mc->idev->dev; 672 char buf[MAX_ADDR_LEN]; 673 674 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 675 IPV6_ADDR_SCOPE_LINKLOCAL) 676 return; 677 678 if (!(mc->mca_flags&MAF_LOADED)) { 679 mc->mca_flags |= MAF_LOADED; 680 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 681 dev_mc_add(dev, buf); 682 } 683 684 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 685 return; 686 687 if (mld_in_v1_mode(mc->idev)) { 688 igmp6_join_group(mc); 689 return; 690 } 691 /* else v2 */ 692 693 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 694 * should not send filter-mode change record as the mode 695 * should be from IN() to IN(A). 696 */ 697 if (mc->mca_sfmode == MCAST_EXCLUDE) 698 mc->mca_crcount = mc->idev->mc_qrv; 699 700 mld_ifc_event(mc->idev); 701 } 702 703 /* called with mc_lock */ 704 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 705 { 706 struct net_device *dev = mc->idev->dev; 707 char buf[MAX_ADDR_LEN]; 708 709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 710 IPV6_ADDR_SCOPE_LINKLOCAL) 711 return; 712 713 if (mc->mca_flags&MAF_LOADED) { 714 mc->mca_flags &= ~MAF_LOADED; 715 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 716 dev_mc_del(dev, buf); 717 } 718 719 if (mc->mca_flags & MAF_NOREPORT) 720 return; 721 722 if (!mc->idev->dead) 723 igmp6_leave_group(mc); 724 725 if (cancel_delayed_work(&mc->mca_work)) 726 refcount_dec(&mc->mca_refcnt); 727 } 728 729 /* 730 * deleted ifmcaddr6 manipulation 731 * called with mc_lock 732 */ 733 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 734 { 735 struct ifmcaddr6 *pmc; 736 737 /* this is an "ifmcaddr6" for convenience; only the fields below 738 * are actually used. In particular, the refcnt and users are not 739 * used for management of the delete list. Using the same structure 740 * for deleted items allows change reports to use common code with 741 * non-deleted or query-response MCA's. 742 */ 743 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 744 if (!pmc) 745 return; 746 747 pmc->idev = im->idev; 748 in6_dev_hold(idev); 749 pmc->mca_addr = im->mca_addr; 750 pmc->mca_crcount = idev->mc_qrv; 751 pmc->mca_sfmode = im->mca_sfmode; 752 if (pmc->mca_sfmode == MCAST_INCLUDE) { 753 struct ip6_sf_list *psf; 754 755 rcu_assign_pointer(pmc->mca_tomb, 756 mc_dereference(im->mca_tomb, idev)); 757 rcu_assign_pointer(pmc->mca_sources, 758 mc_dereference(im->mca_sources, idev)); 759 RCU_INIT_POINTER(im->mca_tomb, NULL); 760 RCU_INIT_POINTER(im->mca_sources, NULL); 761 762 for_each_psf_mclock(pmc, psf) 763 psf->sf_crcount = pmc->mca_crcount; 764 } 765 766 rcu_assign_pointer(pmc->next, idev->mc_tomb); 767 rcu_assign_pointer(idev->mc_tomb, pmc); 768 } 769 770 /* called with mc_lock */ 771 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 772 { 773 struct ip6_sf_list *psf, *sources, *tomb; 774 struct in6_addr *pmca = &im->mca_addr; 775 struct ifmcaddr6 *pmc, *pmc_prev; 776 777 pmc_prev = NULL; 778 for_each_mc_tomb(idev, pmc) { 779 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 780 break; 781 pmc_prev = pmc; 782 } 783 if (pmc) { 784 if (pmc_prev) 785 rcu_assign_pointer(pmc_prev->next, pmc->next); 786 else 787 rcu_assign_pointer(idev->mc_tomb, pmc->next); 788 } 789 790 if (pmc) { 791 im->idev = pmc->idev; 792 if (im->mca_sfmode == MCAST_INCLUDE) { 793 tomb = rcu_replace_pointer(im->mca_tomb, 794 mc_dereference(pmc->mca_tomb, pmc->idev), 795 lockdep_is_held(&im->idev->mc_lock)); 796 rcu_assign_pointer(pmc->mca_tomb, tomb); 797 798 sources = rcu_replace_pointer(im->mca_sources, 799 mc_dereference(pmc->mca_sources, pmc->idev), 800 lockdep_is_held(&im->idev->mc_lock)); 801 rcu_assign_pointer(pmc->mca_sources, sources); 802 for_each_psf_mclock(im, psf) 803 psf->sf_crcount = idev->mc_qrv; 804 } else { 805 im->mca_crcount = idev->mc_qrv; 806 } 807 in6_dev_put(pmc->idev); 808 ip6_mc_clear_src(pmc); 809 kfree_rcu(pmc, rcu); 810 } 811 } 812 813 /* called with mc_lock */ 814 static void mld_clear_delrec(struct inet6_dev *idev) 815 { 816 struct ifmcaddr6 *pmc, *nextpmc; 817 818 pmc = mc_dereference(idev->mc_tomb, idev); 819 RCU_INIT_POINTER(idev->mc_tomb, NULL); 820 821 for (; pmc; pmc = nextpmc) { 822 nextpmc = mc_dereference(pmc->next, idev); 823 ip6_mc_clear_src(pmc); 824 in6_dev_put(pmc->idev); 825 kfree_rcu(pmc, rcu); 826 } 827 828 /* clear dead sources, too */ 829 for_each_mc_mclock(idev, pmc) { 830 struct ip6_sf_list *psf, *psf_next; 831 832 psf = mc_dereference(pmc->mca_tomb, idev); 833 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 834 for (; psf; psf = psf_next) { 835 psf_next = mc_dereference(psf->sf_next, idev); 836 kfree_rcu(psf, rcu); 837 } 838 } 839 } 840 841 static void mld_clear_query(struct inet6_dev *idev) 842 { 843 struct sk_buff *skb; 844 845 spin_lock_bh(&idev->mc_query_lock); 846 while ((skb = __skb_dequeue(&idev->mc_query_queue))) 847 kfree_skb(skb); 848 spin_unlock_bh(&idev->mc_query_lock); 849 } 850 851 static void mld_clear_report(struct inet6_dev *idev) 852 { 853 struct sk_buff *skb; 854 855 spin_lock_bh(&idev->mc_report_lock); 856 while ((skb = __skb_dequeue(&idev->mc_report_queue))) 857 kfree_skb(skb); 858 spin_unlock_bh(&idev->mc_report_lock); 859 } 860 861 static void mca_get(struct ifmcaddr6 *mc) 862 { 863 refcount_inc(&mc->mca_refcnt); 864 } 865 866 static void ma_put(struct ifmcaddr6 *mc) 867 { 868 if (refcount_dec_and_test(&mc->mca_refcnt)) { 869 in6_dev_put(mc->idev); 870 kfree_rcu(mc, rcu); 871 } 872 } 873 874 /* called with mc_lock */ 875 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 876 const struct in6_addr *addr, 877 unsigned int mode) 878 { 879 struct ifmcaddr6 *mc; 880 881 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 882 if (!mc) 883 return NULL; 884 885 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 886 887 mc->mca_addr = *addr; 888 mc->idev = idev; /* reference taken by caller */ 889 mc->mca_users = 1; 890 /* mca_stamp should be updated upon changes */ 891 mc->mca_cstamp = mc->mca_tstamp = jiffies; 892 refcount_set(&mc->mca_refcnt, 1); 893 894 mc->mca_sfmode = mode; 895 mc->mca_sfcount[mode] = 1; 896 897 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 898 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 899 mc->mca_flags |= MAF_NOREPORT; 900 901 return mc; 902 } 903 904 /* 905 * device multicast group inc (add if not found) 906 */ 907 static int __ipv6_dev_mc_inc(struct net_device *dev, 908 const struct in6_addr *addr, unsigned int mode) 909 { 910 struct ifmcaddr6 *mc; 911 struct inet6_dev *idev; 912 913 ASSERT_RTNL(); 914 915 /* we need to take a reference on idev */ 916 idev = in6_dev_get(dev); 917 918 if (!idev) 919 return -EINVAL; 920 921 if (idev->dead) { 922 in6_dev_put(idev); 923 return -ENODEV; 924 } 925 926 mutex_lock(&idev->mc_lock); 927 for_each_mc_mclock(idev, mc) { 928 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 929 mc->mca_users++; 930 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 931 mutex_unlock(&idev->mc_lock); 932 in6_dev_put(idev); 933 return 0; 934 } 935 } 936 937 mc = mca_alloc(idev, addr, mode); 938 if (!mc) { 939 mutex_unlock(&idev->mc_lock); 940 in6_dev_put(idev); 941 return -ENOMEM; 942 } 943 944 rcu_assign_pointer(mc->next, idev->mc_list); 945 rcu_assign_pointer(idev->mc_list, mc); 946 947 mca_get(mc); 948 949 mld_del_delrec(idev, mc); 950 igmp6_group_added(mc); 951 mutex_unlock(&idev->mc_lock); 952 ma_put(mc); 953 return 0; 954 } 955 956 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 957 { 958 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 959 } 960 EXPORT_SYMBOL(ipv6_dev_mc_inc); 961 962 /* 963 * device multicast group del 964 */ 965 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 966 { 967 struct ifmcaddr6 *ma, __rcu **map; 968 969 ASSERT_RTNL(); 970 971 mutex_lock(&idev->mc_lock); 972 for (map = &idev->mc_list; 973 (ma = mc_dereference(*map, idev)); 974 map = &ma->next) { 975 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 976 if (--ma->mca_users == 0) { 977 *map = ma->next; 978 979 igmp6_group_dropped(ma); 980 ip6_mc_clear_src(ma); 981 mutex_unlock(&idev->mc_lock); 982 983 ma_put(ma); 984 return 0; 985 } 986 mutex_unlock(&idev->mc_lock); 987 return 0; 988 } 989 } 990 991 mutex_unlock(&idev->mc_lock); 992 return -ENOENT; 993 } 994 995 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 996 { 997 struct inet6_dev *idev; 998 int err; 999 1000 ASSERT_RTNL(); 1001 1002 idev = __in6_dev_get(dev); 1003 if (!idev) 1004 err = -ENODEV; 1005 else 1006 err = __ipv6_dev_mc_dec(idev, addr); 1007 1008 return err; 1009 } 1010 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1011 1012 /* 1013 * check if the interface/address pair is valid 1014 */ 1015 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1016 const struct in6_addr *src_addr) 1017 { 1018 struct inet6_dev *idev; 1019 struct ifmcaddr6 *mc; 1020 bool rv = false; 1021 1022 rcu_read_lock(); 1023 idev = __in6_dev_get(dev); 1024 if (!idev) 1025 goto unlock; 1026 for_each_mc_rcu(idev, mc) { 1027 if (ipv6_addr_equal(&mc->mca_addr, group)) 1028 break; 1029 } 1030 if (!mc) 1031 goto unlock; 1032 if (src_addr && !ipv6_addr_any(src_addr)) { 1033 struct ip6_sf_list *psf; 1034 1035 for_each_psf_rcu(mc, psf) { 1036 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1037 break; 1038 } 1039 if (psf) 1040 rv = READ_ONCE(psf->sf_count[MCAST_INCLUDE]) || 1041 READ_ONCE(psf->sf_count[MCAST_EXCLUDE]) != 1042 READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]); 1043 else 1044 rv = READ_ONCE(mc->mca_sfcount[MCAST_EXCLUDE]) != 0; 1045 } else { 1046 rv = true; /* don't filter unspecified source */ 1047 } 1048 unlock: 1049 rcu_read_unlock(); 1050 return rv; 1051 } 1052 1053 /* called with mc_lock */ 1054 static void mld_gq_start_work(struct inet6_dev *idev) 1055 { 1056 unsigned long tv = get_random_u32_below(idev->mc_maxdelay); 1057 1058 idev->mc_gq_running = 1; 1059 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1060 in6_dev_hold(idev); 1061 } 1062 1063 /* called with mc_lock */ 1064 static void mld_gq_stop_work(struct inet6_dev *idev) 1065 { 1066 idev->mc_gq_running = 0; 1067 if (cancel_delayed_work(&idev->mc_gq_work)) 1068 __in6_dev_put(idev); 1069 } 1070 1071 /* called with mc_lock */ 1072 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1073 { 1074 unsigned long tv = get_random_u32_below(delay); 1075 1076 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1077 in6_dev_hold(idev); 1078 } 1079 1080 /* called with mc_lock */ 1081 static void mld_ifc_stop_work(struct inet6_dev *idev) 1082 { 1083 idev->mc_ifc_count = 0; 1084 if (cancel_delayed_work(&idev->mc_ifc_work)) 1085 __in6_dev_put(idev); 1086 } 1087 1088 /* called with mc_lock */ 1089 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1090 { 1091 unsigned long tv = get_random_u32_below(delay); 1092 1093 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1094 in6_dev_hold(idev); 1095 } 1096 1097 static void mld_dad_stop_work(struct inet6_dev *idev) 1098 { 1099 if (cancel_delayed_work(&idev->mc_dad_work)) 1100 __in6_dev_put(idev); 1101 } 1102 1103 static void mld_query_stop_work(struct inet6_dev *idev) 1104 { 1105 spin_lock_bh(&idev->mc_query_lock); 1106 if (cancel_delayed_work(&idev->mc_query_work)) 1107 __in6_dev_put(idev); 1108 spin_unlock_bh(&idev->mc_query_lock); 1109 } 1110 1111 static void mld_report_stop_work(struct inet6_dev *idev) 1112 { 1113 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1114 __in6_dev_put(idev); 1115 } 1116 1117 /* 1118 * IGMP handling (alias multicast ICMPv6 messages) 1119 * called with mc_lock 1120 */ 1121 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1122 { 1123 unsigned long delay = resptime; 1124 1125 /* Do not start work for these addresses */ 1126 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1127 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1128 return; 1129 1130 if (cancel_delayed_work(&ma->mca_work)) { 1131 refcount_dec(&ma->mca_refcnt); 1132 delay = ma->mca_work.timer.expires - jiffies; 1133 } 1134 1135 if (delay >= resptime) 1136 delay = get_random_u32_below(resptime); 1137 1138 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1139 refcount_inc(&ma->mca_refcnt); 1140 ma->mca_flags |= MAF_TIMER_RUNNING; 1141 } 1142 1143 /* mark EXCLUDE-mode sources 1144 * called with mc_lock 1145 */ 1146 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1147 const struct in6_addr *srcs) 1148 { 1149 struct ip6_sf_list *psf; 1150 int i, scount; 1151 1152 scount = 0; 1153 for_each_psf_mclock(pmc, psf) { 1154 if (scount == nsrcs) 1155 break; 1156 for (i = 0; i < nsrcs; i++) { 1157 /* skip inactive filters */ 1158 if (psf->sf_count[MCAST_INCLUDE] || 1159 pmc->mca_sfcount[MCAST_EXCLUDE] != 1160 psf->sf_count[MCAST_EXCLUDE]) 1161 break; 1162 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1163 scount++; 1164 break; 1165 } 1166 } 1167 } 1168 pmc->mca_flags &= ~MAF_GSQUERY; 1169 if (scount == nsrcs) /* all sources excluded */ 1170 return false; 1171 return true; 1172 } 1173 1174 /* called with mc_lock */ 1175 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1176 const struct in6_addr *srcs) 1177 { 1178 struct ip6_sf_list *psf; 1179 int i, scount; 1180 1181 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1182 return mld_xmarksources(pmc, nsrcs, srcs); 1183 1184 /* mark INCLUDE-mode sources */ 1185 1186 scount = 0; 1187 for_each_psf_mclock(pmc, psf) { 1188 if (scount == nsrcs) 1189 break; 1190 for (i = 0; i < nsrcs; i++) { 1191 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1192 psf->sf_gsresp = 1; 1193 scount++; 1194 break; 1195 } 1196 } 1197 } 1198 if (!scount) { 1199 pmc->mca_flags &= ~MAF_GSQUERY; 1200 return false; 1201 } 1202 pmc->mca_flags |= MAF_GSQUERY; 1203 return true; 1204 } 1205 1206 static int mld_force_mld_version(const struct inet6_dev *idev) 1207 { 1208 const struct net *net = dev_net(idev->dev); 1209 int all_force; 1210 1211 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version); 1212 /* Normally, both are 0 here. If enforcement to a particular is 1213 * being used, individual device enforcement will have a lower 1214 * precedence over 'all' device (.../conf/all/force_mld_version). 1215 */ 1216 return all_force ?: READ_ONCE(idev->cnf.force_mld_version); 1217 } 1218 1219 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1220 { 1221 return mld_force_mld_version(idev) == 2; 1222 } 1223 1224 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1225 { 1226 return mld_force_mld_version(idev) == 1; 1227 } 1228 1229 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1230 { 1231 if (mld_in_v2_mode_only(idev)) 1232 return false; 1233 if (mld_in_v1_mode_only(idev)) 1234 return true; 1235 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1236 return true; 1237 1238 return false; 1239 } 1240 1241 static void mld_set_v1_mode(struct inet6_dev *idev) 1242 { 1243 /* RFC3810, relevant sections: 1244 * - 9.1. Robustness Variable 1245 * - 9.2. Query Interval 1246 * - 9.3. Query Response Interval 1247 * - 9.12. Older Version Querier Present Timeout 1248 */ 1249 unsigned long switchback; 1250 1251 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1252 1253 idev->mc_v1_seen = jiffies + switchback; 1254 } 1255 1256 static void mld_update_qrv(struct inet6_dev *idev, 1257 const struct mld2_query *mlh2) 1258 { 1259 /* RFC3810, relevant sections: 1260 * - 5.1.8. QRV (Querier's Robustness Variable) 1261 * - 9.1. Robustness Variable 1262 */ 1263 1264 /* The value of the Robustness Variable MUST NOT be zero, 1265 * and SHOULD NOT be one. Catch this here if we ever run 1266 * into such a case in future. 1267 */ 1268 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1269 WARN_ON(idev->mc_qrv == 0); 1270 1271 if (mlh2->mld2q_qrv > 0) 1272 idev->mc_qrv = mlh2->mld2q_qrv; 1273 1274 if (unlikely(idev->mc_qrv < min_qrv)) { 1275 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1276 idev->mc_qrv, min_qrv); 1277 idev->mc_qrv = min_qrv; 1278 } 1279 } 1280 1281 static void mld_update_qi(struct inet6_dev *idev, 1282 const struct mld2_query *mlh2) 1283 { 1284 /* RFC3810, relevant sections: 1285 * - 5.1.9. QQIC (Querier's Query Interval Code) 1286 * - 9.2. Query Interval 1287 * - 9.12. Older Version Querier Present Timeout 1288 * (the [Query Interval] in the last Query received) 1289 */ 1290 unsigned long mc_qqi; 1291 1292 if (mlh2->mld2q_qqic < 128) { 1293 mc_qqi = mlh2->mld2q_qqic; 1294 } else { 1295 unsigned long mc_man, mc_exp; 1296 1297 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1298 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1299 1300 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1301 } 1302 1303 idev->mc_qi = mc_qqi * HZ; 1304 } 1305 1306 static void mld_update_qri(struct inet6_dev *idev, 1307 const struct mld2_query *mlh2) 1308 { 1309 /* RFC3810, relevant sections: 1310 * - 5.1.3. Maximum Response Code 1311 * - 9.3. Query Response Interval 1312 */ 1313 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1314 } 1315 1316 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1317 unsigned long *max_delay, bool v1_query) 1318 { 1319 unsigned long mldv1_md; 1320 1321 /* Ignore v1 queries */ 1322 if (mld_in_v2_mode_only(idev)) 1323 return -EINVAL; 1324 1325 mldv1_md = ntohs(mld->mld_maxdelay); 1326 1327 /* When in MLDv1 fallback and a MLDv2 router start-up being 1328 * unaware of current MLDv1 operation, the MRC == MRD mapping 1329 * only works when the exponential algorithm is not being 1330 * used (as MLDv1 is unaware of such things). 1331 * 1332 * According to the RFC author, the MLDv2 implementations 1333 * he's aware of all use a MRC < 32768 on start up queries. 1334 * 1335 * Thus, should we *ever* encounter something else larger 1336 * than that, just assume the maximum possible within our 1337 * reach. 1338 */ 1339 if (!v1_query) 1340 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1341 1342 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1343 1344 /* MLDv1 router present: we need to go into v1 mode *only* 1345 * when an MLDv1 query is received as per section 9.12. of 1346 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1347 * queries MUST be of exactly 24 octets. 1348 */ 1349 if (v1_query) 1350 mld_set_v1_mode(idev); 1351 1352 /* cancel MLDv2 report work */ 1353 mld_gq_stop_work(idev); 1354 /* cancel the interface change work */ 1355 mld_ifc_stop_work(idev); 1356 /* clear deleted report items */ 1357 mld_clear_delrec(idev); 1358 1359 return 0; 1360 } 1361 1362 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1363 unsigned long *max_delay) 1364 { 1365 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1366 1367 mld_update_qrv(idev, mld); 1368 mld_update_qi(idev, mld); 1369 mld_update_qri(idev, mld); 1370 1371 idev->mc_maxdelay = *max_delay; 1372 1373 return; 1374 } 1375 1376 /* called with rcu_read_lock() */ 1377 void igmp6_event_query(struct sk_buff *skb) 1378 { 1379 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1380 1381 if (!idev || idev->dead) 1382 goto out; 1383 1384 spin_lock_bh(&idev->mc_query_lock); 1385 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1386 __skb_queue_tail(&idev->mc_query_queue, skb); 1387 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1388 in6_dev_hold(idev); 1389 skb = NULL; 1390 } 1391 spin_unlock_bh(&idev->mc_query_lock); 1392 out: 1393 kfree_skb(skb); 1394 } 1395 1396 static void __mld_query_work(struct sk_buff *skb) 1397 { 1398 struct mld2_query *mlh2 = NULL; 1399 const struct in6_addr *group; 1400 unsigned long max_delay; 1401 struct inet6_dev *idev; 1402 struct ifmcaddr6 *ma; 1403 struct mld_msg *mld; 1404 int group_type; 1405 int mark = 0; 1406 int len, err; 1407 1408 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1409 goto kfree_skb; 1410 1411 /* compute payload length excluding extension headers */ 1412 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1413 len -= skb_network_header_len(skb); 1414 1415 /* RFC3810 6.2 1416 * Upon reception of an MLD message that contains a Query, the node 1417 * checks if the source address of the message is a valid link-local 1418 * address, if the Hop Limit is set to 1, and if the Router Alert 1419 * option is present in the Hop-By-Hop Options header of the IPv6 1420 * packet. If any of these checks fails, the packet is dropped. 1421 */ 1422 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1423 ipv6_hdr(skb)->hop_limit != 1 || 1424 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1425 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1426 goto kfree_skb; 1427 1428 idev = in6_dev_get(skb->dev); 1429 if (!idev) 1430 goto kfree_skb; 1431 1432 mld = (struct mld_msg *)icmp6_hdr(skb); 1433 group = &mld->mld_mca; 1434 group_type = ipv6_addr_type(group); 1435 1436 if (group_type != IPV6_ADDR_ANY && 1437 !(group_type&IPV6_ADDR_MULTICAST)) 1438 goto out; 1439 1440 if (len < MLD_V1_QUERY_LEN) { 1441 goto out; 1442 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1443 err = mld_process_v1(idev, mld, &max_delay, 1444 len == MLD_V1_QUERY_LEN); 1445 if (err < 0) 1446 goto out; 1447 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1448 int srcs_offset = sizeof(struct mld2_query) - 1449 sizeof(struct icmp6hdr); 1450 1451 if (!pskb_may_pull(skb, srcs_offset)) 1452 goto out; 1453 1454 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1455 1456 mld_process_v2(idev, mlh2, &max_delay); 1457 1458 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1459 if (mlh2->mld2q_nsrcs) 1460 goto out; /* no sources allowed */ 1461 1462 mld_gq_start_work(idev); 1463 goto out; 1464 } 1465 /* mark sources to include, if group & source-specific */ 1466 if (mlh2->mld2q_nsrcs != 0) { 1467 if (!pskb_may_pull(skb, srcs_offset + 1468 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1469 goto out; 1470 1471 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1472 mark = 1; 1473 } 1474 } else { 1475 goto out; 1476 } 1477 1478 if (group_type == IPV6_ADDR_ANY) { 1479 for_each_mc_mclock(idev, ma) { 1480 igmp6_group_queried(ma, max_delay); 1481 } 1482 } else { 1483 for_each_mc_mclock(idev, ma) { 1484 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1485 continue; 1486 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1487 /* gsquery <- gsquery && mark */ 1488 if (!mark) 1489 ma->mca_flags &= ~MAF_GSQUERY; 1490 } else { 1491 /* gsquery <- mark */ 1492 if (mark) 1493 ma->mca_flags |= MAF_GSQUERY; 1494 else 1495 ma->mca_flags &= ~MAF_GSQUERY; 1496 } 1497 if (!(ma->mca_flags & MAF_GSQUERY) || 1498 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1499 igmp6_group_queried(ma, max_delay); 1500 break; 1501 } 1502 } 1503 1504 out: 1505 in6_dev_put(idev); 1506 kfree_skb: 1507 consume_skb(skb); 1508 } 1509 1510 static void mld_query_work(struct work_struct *work) 1511 { 1512 struct inet6_dev *idev = container_of(to_delayed_work(work), 1513 struct inet6_dev, 1514 mc_query_work); 1515 struct sk_buff_head q; 1516 struct sk_buff *skb; 1517 bool rework = false; 1518 int cnt = 0; 1519 1520 skb_queue_head_init(&q); 1521 1522 spin_lock_bh(&idev->mc_query_lock); 1523 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1524 __skb_queue_tail(&q, skb); 1525 1526 if (++cnt >= MLD_MAX_QUEUE) { 1527 rework = true; 1528 break; 1529 } 1530 } 1531 spin_unlock_bh(&idev->mc_query_lock); 1532 1533 mutex_lock(&idev->mc_lock); 1534 while ((skb = __skb_dequeue(&q))) 1535 __mld_query_work(skb); 1536 mutex_unlock(&idev->mc_lock); 1537 1538 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1539 return; 1540 1541 in6_dev_put(idev); 1542 } 1543 1544 /* called with rcu_read_lock() */ 1545 void igmp6_event_report(struct sk_buff *skb) 1546 { 1547 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1548 1549 if (!idev || idev->dead) 1550 goto out; 1551 1552 spin_lock_bh(&idev->mc_report_lock); 1553 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1554 __skb_queue_tail(&idev->mc_report_queue, skb); 1555 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1556 in6_dev_hold(idev); 1557 skb = NULL; 1558 } 1559 spin_unlock_bh(&idev->mc_report_lock); 1560 out: 1561 kfree_skb(skb); 1562 } 1563 1564 static void __mld_report_work(struct sk_buff *skb) 1565 { 1566 struct inet6_dev *idev; 1567 struct ifmcaddr6 *ma; 1568 struct mld_msg *mld; 1569 int addr_type; 1570 1571 /* Our own report looped back. Ignore it. */ 1572 if (skb->pkt_type == PACKET_LOOPBACK) 1573 goto kfree_skb; 1574 1575 /* send our report if the MC router may not have heard this report */ 1576 if (skb->pkt_type != PACKET_MULTICAST && 1577 skb->pkt_type != PACKET_BROADCAST) 1578 goto kfree_skb; 1579 1580 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1581 goto kfree_skb; 1582 1583 mld = (struct mld_msg *)icmp6_hdr(skb); 1584 1585 /* Drop reports with not link local source */ 1586 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1587 if (addr_type != IPV6_ADDR_ANY && 1588 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1589 goto kfree_skb; 1590 1591 idev = in6_dev_get(skb->dev); 1592 if (!idev) 1593 goto kfree_skb; 1594 1595 /* 1596 * Cancel the work for this group 1597 */ 1598 1599 for_each_mc_mclock(idev, ma) { 1600 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1601 if (cancel_delayed_work(&ma->mca_work)) 1602 refcount_dec(&ma->mca_refcnt); 1603 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1604 MAF_TIMER_RUNNING); 1605 break; 1606 } 1607 } 1608 1609 in6_dev_put(idev); 1610 kfree_skb: 1611 consume_skb(skb); 1612 } 1613 1614 static void mld_report_work(struct work_struct *work) 1615 { 1616 struct inet6_dev *idev = container_of(to_delayed_work(work), 1617 struct inet6_dev, 1618 mc_report_work); 1619 struct sk_buff_head q; 1620 struct sk_buff *skb; 1621 bool rework = false; 1622 int cnt = 0; 1623 1624 skb_queue_head_init(&q); 1625 spin_lock_bh(&idev->mc_report_lock); 1626 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1627 __skb_queue_tail(&q, skb); 1628 1629 if (++cnt >= MLD_MAX_QUEUE) { 1630 rework = true; 1631 break; 1632 } 1633 } 1634 spin_unlock_bh(&idev->mc_report_lock); 1635 1636 mutex_lock(&idev->mc_lock); 1637 while ((skb = __skb_dequeue(&q))) 1638 __mld_report_work(skb); 1639 mutex_unlock(&idev->mc_lock); 1640 1641 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1642 return; 1643 1644 in6_dev_put(idev); 1645 } 1646 1647 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1648 int gdeleted, int sdeleted) 1649 { 1650 switch (type) { 1651 case MLD2_MODE_IS_INCLUDE: 1652 case MLD2_MODE_IS_EXCLUDE: 1653 if (gdeleted || sdeleted) 1654 return false; 1655 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1656 if (pmc->mca_sfmode == MCAST_INCLUDE) 1657 return true; 1658 /* don't include if this source is excluded 1659 * in all filters 1660 */ 1661 if (psf->sf_count[MCAST_INCLUDE]) 1662 return type == MLD2_MODE_IS_INCLUDE; 1663 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1664 psf->sf_count[MCAST_EXCLUDE]; 1665 } 1666 return false; 1667 case MLD2_CHANGE_TO_INCLUDE: 1668 if (gdeleted || sdeleted) 1669 return false; 1670 return psf->sf_count[MCAST_INCLUDE] != 0; 1671 case MLD2_CHANGE_TO_EXCLUDE: 1672 if (gdeleted || sdeleted) 1673 return false; 1674 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1675 psf->sf_count[MCAST_INCLUDE]) 1676 return false; 1677 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1678 psf->sf_count[MCAST_EXCLUDE]; 1679 case MLD2_ALLOW_NEW_SOURCES: 1680 if (gdeleted || !psf->sf_crcount) 1681 return false; 1682 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1683 case MLD2_BLOCK_OLD_SOURCES: 1684 if (pmc->mca_sfmode == MCAST_INCLUDE) 1685 return gdeleted || (psf->sf_crcount && sdeleted); 1686 return psf->sf_crcount && !gdeleted && !sdeleted; 1687 } 1688 return false; 1689 } 1690 1691 static int 1692 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1693 { 1694 struct ip6_sf_list *psf; 1695 int scount = 0; 1696 1697 for_each_psf_mclock(pmc, psf) { 1698 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1699 continue; 1700 scount++; 1701 } 1702 return scount; 1703 } 1704 1705 static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, 1706 struct net_device *dev, const struct in6_addr *saddr, 1707 const struct in6_addr *daddr, int proto, int len) 1708 { 1709 struct ipv6hdr *hdr; 1710 1711 skb->protocol = htons(ETH_P_IPV6); 1712 skb->dev = dev; 1713 1714 skb_reset_network_header(skb); 1715 skb_put(skb, sizeof(struct ipv6hdr)); 1716 hdr = ipv6_hdr(skb); 1717 1718 ip6_flow_hdr(hdr, 0, 0); 1719 1720 hdr->payload_len = htons(len); 1721 hdr->nexthdr = proto; 1722 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); 1723 1724 hdr->saddr = *saddr; 1725 hdr->daddr = *daddr; 1726 } 1727 1728 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1729 { 1730 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1731 2, 0, 0, IPV6_TLV_PADN, 0 }; 1732 struct net_device *dev = idev->dev; 1733 int hlen = LL_RESERVED_SPACE(dev); 1734 int tlen = dev->needed_tailroom; 1735 struct net *net = dev_net(dev); 1736 const struct in6_addr *saddr; 1737 struct in6_addr addr_buf; 1738 struct mld2_report *pmr; 1739 struct sk_buff *skb; 1740 unsigned int size; 1741 struct sock *sk; 1742 int err; 1743 1744 sk = net->ipv6.igmp_sk; 1745 /* we assume size > sizeof(ra) here 1746 * Also try to not allocate high-order pages for big MTU 1747 */ 1748 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1749 skb = sock_alloc_send_skb(sk, size, 1, &err); 1750 if (!skb) 1751 return NULL; 1752 1753 skb->priority = TC_PRIO_CONTROL; 1754 skb_reserve(skb, hlen); 1755 skb_tailroom_reserve(skb, mtu, tlen); 1756 1757 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1758 /* <draft-ietf-magma-mld-source-05.txt>: 1759 * use unspecified address as the source address 1760 * when a valid link-local address is not available. 1761 */ 1762 saddr = &in6addr_any; 1763 } else 1764 saddr = &addr_buf; 1765 1766 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1767 1768 skb_put_data(skb, ra, sizeof(ra)); 1769 1770 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1771 skb_put(skb, sizeof(*pmr)); 1772 pmr = (struct mld2_report *)skb_transport_header(skb); 1773 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1774 pmr->mld2r_resv1 = 0; 1775 pmr->mld2r_cksum = 0; 1776 pmr->mld2r_resv2 = 0; 1777 pmr->mld2r_ngrec = 0; 1778 return skb; 1779 } 1780 1781 static void mld_sendpack(struct sk_buff *skb) 1782 { 1783 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1784 struct mld2_report *pmr = 1785 (struct mld2_report *)skb_transport_header(skb); 1786 int payload_len, mldlen; 1787 struct inet6_dev *idev; 1788 struct net *net = dev_net(skb->dev); 1789 int err; 1790 struct flowi6 fl6; 1791 struct dst_entry *dst; 1792 1793 rcu_read_lock(); 1794 idev = __in6_dev_get(skb->dev); 1795 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); 1796 1797 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1798 sizeof(*pip6); 1799 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1800 pip6->payload_len = htons(payload_len); 1801 1802 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1803 IPPROTO_ICMPV6, 1804 csum_partial(skb_transport_header(skb), 1805 mldlen, 0)); 1806 1807 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1808 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1809 skb->dev->ifindex); 1810 dst = icmp6_dst_alloc(skb->dev, &fl6); 1811 1812 err = 0; 1813 if (IS_ERR(dst)) { 1814 err = PTR_ERR(dst); 1815 dst = NULL; 1816 } 1817 skb_dst_set(skb, dst); 1818 if (err) 1819 goto err_out; 1820 1821 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1822 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1823 dst_output); 1824 out: 1825 if (!err) { 1826 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1827 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1828 } else { 1829 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1830 } 1831 1832 rcu_read_unlock(); 1833 return; 1834 1835 err_out: 1836 kfree_skb(skb); 1837 goto out; 1838 } 1839 1840 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1841 { 1842 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1843 } 1844 1845 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1846 int type, struct mld2_grec **ppgr, unsigned int mtu) 1847 { 1848 struct mld2_report *pmr; 1849 struct mld2_grec *pgr; 1850 1851 if (!skb) { 1852 skb = mld_newpack(pmc->idev, mtu); 1853 if (!skb) 1854 return NULL; 1855 } 1856 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1857 pgr->grec_type = type; 1858 pgr->grec_auxwords = 0; 1859 pgr->grec_nsrcs = 0; 1860 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1861 pmr = (struct mld2_report *)skb_transport_header(skb); 1862 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1863 *ppgr = pgr; 1864 return skb; 1865 } 1866 1867 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1868 1869 /* called with mc_lock */ 1870 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1871 int type, int gdeleted, int sdeleted, 1872 int crsend) 1873 { 1874 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1875 int scount, stotal, first, isquery, truncate; 1876 struct ip6_sf_list __rcu **psf_list; 1877 struct inet6_dev *idev = pmc->idev; 1878 struct net_device *dev = idev->dev; 1879 struct mld2_grec *pgr = NULL; 1880 struct mld2_report *pmr; 1881 unsigned int mtu; 1882 1883 if (pmc->mca_flags & MAF_NOREPORT) 1884 return skb; 1885 1886 mtu = READ_ONCE(dev->mtu); 1887 if (mtu < IPV6_MIN_MTU) 1888 return skb; 1889 1890 isquery = type == MLD2_MODE_IS_INCLUDE || 1891 type == MLD2_MODE_IS_EXCLUDE; 1892 truncate = type == MLD2_MODE_IS_EXCLUDE || 1893 type == MLD2_CHANGE_TO_EXCLUDE; 1894 1895 stotal = scount = 0; 1896 1897 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1898 1899 if (!rcu_access_pointer(*psf_list)) 1900 goto empty_source; 1901 1902 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1903 1904 /* EX and TO_EX get a fresh packet, if needed */ 1905 if (truncate) { 1906 if (pmr && pmr->mld2r_ngrec && 1907 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1908 if (skb) 1909 mld_sendpack(skb); 1910 skb = mld_newpack(idev, mtu); 1911 } 1912 } 1913 first = 1; 1914 psf_prev = NULL; 1915 for (psf = mc_dereference(*psf_list, idev); 1916 psf; 1917 psf = psf_next) { 1918 struct in6_addr *psrc; 1919 1920 psf_next = mc_dereference(psf->sf_next, idev); 1921 1922 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1923 psf_prev = psf; 1924 continue; 1925 } 1926 1927 /* Based on RFC3810 6.1. Should not send source-list change 1928 * records when there is a filter mode change. 1929 */ 1930 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1931 (!gdeleted && pmc->mca_crcount)) && 1932 (type == MLD2_ALLOW_NEW_SOURCES || 1933 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1934 goto decrease_sf_crcount; 1935 1936 /* clear marks on query responses */ 1937 if (isquery) 1938 psf->sf_gsresp = 0; 1939 1940 if (AVAILABLE(skb) < sizeof(*psrc) + 1941 first*sizeof(struct mld2_grec)) { 1942 if (truncate && !first) 1943 break; /* truncate these */ 1944 if (pgr) 1945 pgr->grec_nsrcs = htons(scount); 1946 if (skb) 1947 mld_sendpack(skb); 1948 skb = mld_newpack(idev, mtu); 1949 first = 1; 1950 scount = 0; 1951 } 1952 if (first) { 1953 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1954 first = 0; 1955 } 1956 if (!skb) 1957 return NULL; 1958 psrc = skb_put(skb, sizeof(*psrc)); 1959 *psrc = psf->sf_addr; 1960 scount++; stotal++; 1961 if ((type == MLD2_ALLOW_NEW_SOURCES || 1962 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1963 decrease_sf_crcount: 1964 psf->sf_crcount--; 1965 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1966 if (psf_prev) 1967 rcu_assign_pointer(psf_prev->sf_next, 1968 mc_dereference(psf->sf_next, idev)); 1969 else 1970 rcu_assign_pointer(*psf_list, 1971 mc_dereference(psf->sf_next, idev)); 1972 kfree_rcu(psf, rcu); 1973 continue; 1974 } 1975 } 1976 psf_prev = psf; 1977 } 1978 1979 empty_source: 1980 if (!stotal) { 1981 if (type == MLD2_ALLOW_NEW_SOURCES || 1982 type == MLD2_BLOCK_OLD_SOURCES) 1983 return skb; 1984 if (pmc->mca_crcount || isquery || crsend) { 1985 /* make sure we have room for group header */ 1986 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1987 mld_sendpack(skb); 1988 skb = NULL; /* add_grhead will get a new one */ 1989 } 1990 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1991 } 1992 } 1993 if (pgr) 1994 pgr->grec_nsrcs = htons(scount); 1995 1996 if (isquery) 1997 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1998 return skb; 1999 } 2000 2001 /* called with mc_lock */ 2002 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2003 { 2004 struct sk_buff *skb = NULL; 2005 int type; 2006 2007 if (!pmc) { 2008 for_each_mc_mclock(idev, pmc) { 2009 if (pmc->mca_flags & MAF_NOREPORT) 2010 continue; 2011 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2012 type = MLD2_MODE_IS_EXCLUDE; 2013 else 2014 type = MLD2_MODE_IS_INCLUDE; 2015 skb = add_grec(skb, pmc, type, 0, 0, 0); 2016 } 2017 } else { 2018 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2019 type = MLD2_MODE_IS_EXCLUDE; 2020 else 2021 type = MLD2_MODE_IS_INCLUDE; 2022 skb = add_grec(skb, pmc, type, 0, 0, 0); 2023 } 2024 if (skb) 2025 mld_sendpack(skb); 2026 } 2027 2028 /* 2029 * remove zero-count source records from a source filter list 2030 * called with mc_lock 2031 */ 2032 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2033 { 2034 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2035 2036 psf_prev = NULL; 2037 for (psf = mc_dereference(*ppsf, idev); 2038 psf; 2039 psf = psf_next) { 2040 psf_next = mc_dereference(psf->sf_next, idev); 2041 if (psf->sf_crcount == 0) { 2042 if (psf_prev) 2043 rcu_assign_pointer(psf_prev->sf_next, 2044 mc_dereference(psf->sf_next, idev)); 2045 else 2046 rcu_assign_pointer(*ppsf, 2047 mc_dereference(psf->sf_next, idev)); 2048 kfree_rcu(psf, rcu); 2049 } else { 2050 psf_prev = psf; 2051 } 2052 } 2053 } 2054 2055 /* called with mc_lock */ 2056 static void mld_send_cr(struct inet6_dev *idev) 2057 { 2058 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2059 struct sk_buff *skb = NULL; 2060 int type, dtype; 2061 2062 /* deleted MCA's */ 2063 pmc_prev = NULL; 2064 for (pmc = mc_dereference(idev->mc_tomb, idev); 2065 pmc; 2066 pmc = pmc_next) { 2067 pmc_next = mc_dereference(pmc->next, idev); 2068 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2069 type = MLD2_BLOCK_OLD_SOURCES; 2070 dtype = MLD2_BLOCK_OLD_SOURCES; 2071 skb = add_grec(skb, pmc, type, 1, 0, 0); 2072 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2073 } 2074 if (pmc->mca_crcount) { 2075 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2076 type = MLD2_CHANGE_TO_INCLUDE; 2077 skb = add_grec(skb, pmc, type, 1, 0, 0); 2078 } 2079 pmc->mca_crcount--; 2080 if (pmc->mca_crcount == 0) { 2081 mld_clear_zeros(&pmc->mca_tomb, idev); 2082 mld_clear_zeros(&pmc->mca_sources, idev); 2083 } 2084 } 2085 if (pmc->mca_crcount == 0 && 2086 !rcu_access_pointer(pmc->mca_tomb) && 2087 !rcu_access_pointer(pmc->mca_sources)) { 2088 if (pmc_prev) 2089 rcu_assign_pointer(pmc_prev->next, pmc_next); 2090 else 2091 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2092 in6_dev_put(pmc->idev); 2093 kfree_rcu(pmc, rcu); 2094 } else 2095 pmc_prev = pmc; 2096 } 2097 2098 /* change recs */ 2099 for_each_mc_mclock(idev, pmc) { 2100 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2101 type = MLD2_BLOCK_OLD_SOURCES; 2102 dtype = MLD2_ALLOW_NEW_SOURCES; 2103 } else { 2104 type = MLD2_ALLOW_NEW_SOURCES; 2105 dtype = MLD2_BLOCK_OLD_SOURCES; 2106 } 2107 skb = add_grec(skb, pmc, type, 0, 0, 0); 2108 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2109 2110 /* filter mode changes */ 2111 if (pmc->mca_crcount) { 2112 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2113 type = MLD2_CHANGE_TO_EXCLUDE; 2114 else 2115 type = MLD2_CHANGE_TO_INCLUDE; 2116 skb = add_grec(skb, pmc, type, 0, 0, 0); 2117 pmc->mca_crcount--; 2118 } 2119 } 2120 if (!skb) 2121 return; 2122 (void) mld_sendpack(skb); 2123 } 2124 2125 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2126 { 2127 struct net *net = dev_net(dev); 2128 struct sock *sk = net->ipv6.igmp_sk; 2129 struct inet6_dev *idev; 2130 struct sk_buff *skb; 2131 struct mld_msg *hdr; 2132 const struct in6_addr *snd_addr, *saddr; 2133 struct in6_addr addr_buf; 2134 int hlen = LL_RESERVED_SPACE(dev); 2135 int tlen = dev->needed_tailroom; 2136 int err, len, payload_len, full_len; 2137 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2138 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2139 IPV6_TLV_PADN, 0 }; 2140 struct flowi6 fl6; 2141 struct dst_entry *dst; 2142 2143 if (type == ICMPV6_MGM_REDUCTION) 2144 snd_addr = &in6addr_linklocal_allrouters; 2145 else 2146 snd_addr = addr; 2147 2148 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2149 payload_len = len + sizeof(ra); 2150 full_len = sizeof(struct ipv6hdr) + payload_len; 2151 2152 rcu_read_lock(); 2153 IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_OUTREQUESTS); 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 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1); 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 WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1); 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 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2509 pmc->mca_sfcount[sfmode] + 1); 2510 err = 0; 2511 for (i = 0; i < sfcount; i++) { 2512 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2513 if (err) 2514 break; 2515 } 2516 if (err) { 2517 int j; 2518 2519 if (!delta) 2520 WRITE_ONCE(pmc->mca_sfcount[sfmode], 2521 pmc->mca_sfcount[sfmode] - 1); 2522 for (j = 0; j < i; j++) 2523 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2524 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2525 struct ip6_sf_list *psf; 2526 2527 /* filter mode change */ 2528 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2529 pmc->mca_sfmode = MCAST_EXCLUDE; 2530 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2531 pmc->mca_sfmode = MCAST_INCLUDE; 2532 /* else no filters; keep old mode for reports */ 2533 2534 pmc->mca_crcount = idev->mc_qrv; 2535 idev->mc_ifc_count = pmc->mca_crcount; 2536 for_each_psf_mclock(pmc, psf) 2537 psf->sf_crcount = 0; 2538 mld_ifc_event(idev); 2539 } else if (sf_setstate(pmc)) { 2540 mld_ifc_event(idev); 2541 } 2542 return err; 2543 } 2544 2545 /* called with mc_lock */ 2546 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2547 { 2548 struct ip6_sf_list *psf, *nextpsf; 2549 2550 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2551 psf; 2552 psf = nextpsf) { 2553 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2554 kfree_rcu(psf, rcu); 2555 } 2556 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2557 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2558 psf; 2559 psf = nextpsf) { 2560 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2561 kfree_rcu(psf, rcu); 2562 } 2563 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2564 pmc->mca_sfmode = MCAST_EXCLUDE; 2565 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2566 /* Paired with the READ_ONCE() from ipv6_chk_mcast_addr() */ 2567 WRITE_ONCE(pmc->mca_sfcount[MCAST_EXCLUDE], 1); 2568 } 2569 2570 /* called with mc_lock */ 2571 static void igmp6_join_group(struct ifmcaddr6 *ma) 2572 { 2573 unsigned long delay; 2574 2575 if (ma->mca_flags & MAF_NOREPORT) 2576 return; 2577 2578 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2579 2580 delay = get_random_u32_below(unsolicited_report_interval(ma->idev)); 2581 2582 if (cancel_delayed_work(&ma->mca_work)) { 2583 refcount_dec(&ma->mca_refcnt); 2584 delay = ma->mca_work.timer.expires - jiffies; 2585 } 2586 2587 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2588 refcount_inc(&ma->mca_refcnt); 2589 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2590 } 2591 2592 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2593 struct inet6_dev *idev) 2594 { 2595 struct ip6_sf_socklist *psl; 2596 int err; 2597 2598 psl = sock_dereference(iml->sflist, sk); 2599 2600 if (idev) 2601 mutex_lock(&idev->mc_lock); 2602 2603 if (!psl) { 2604 /* any-source empty exclude case */ 2605 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2606 } else { 2607 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2608 psl->sl_count, psl->sl_addr, 0); 2609 RCU_INIT_POINTER(iml->sflist, NULL); 2610 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2611 &sk->sk_omem_alloc); 2612 kfree_rcu(psl, rcu); 2613 } 2614 2615 if (idev) 2616 mutex_unlock(&idev->mc_lock); 2617 2618 return err; 2619 } 2620 2621 /* called with mc_lock */ 2622 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2623 { 2624 if (mld_in_v1_mode(ma->idev)) { 2625 if (ma->mca_flags & MAF_LAST_REPORTER) { 2626 igmp6_send(&ma->mca_addr, ma->idev->dev, 2627 ICMPV6_MGM_REDUCTION); 2628 } 2629 } else { 2630 mld_add_delrec(ma->idev, ma); 2631 mld_ifc_event(ma->idev); 2632 } 2633 } 2634 2635 static void mld_gq_work(struct work_struct *work) 2636 { 2637 struct inet6_dev *idev = container_of(to_delayed_work(work), 2638 struct inet6_dev, 2639 mc_gq_work); 2640 2641 mutex_lock(&idev->mc_lock); 2642 mld_send_report(idev, NULL); 2643 idev->mc_gq_running = 0; 2644 mutex_unlock(&idev->mc_lock); 2645 2646 in6_dev_put(idev); 2647 } 2648 2649 static void mld_ifc_work(struct work_struct *work) 2650 { 2651 struct inet6_dev *idev = container_of(to_delayed_work(work), 2652 struct inet6_dev, 2653 mc_ifc_work); 2654 2655 mutex_lock(&idev->mc_lock); 2656 mld_send_cr(idev); 2657 2658 if (idev->mc_ifc_count) { 2659 idev->mc_ifc_count--; 2660 if (idev->mc_ifc_count) 2661 mld_ifc_start_work(idev, 2662 unsolicited_report_interval(idev)); 2663 } 2664 mutex_unlock(&idev->mc_lock); 2665 in6_dev_put(idev); 2666 } 2667 2668 /* called with mc_lock */ 2669 static void mld_ifc_event(struct inet6_dev *idev) 2670 { 2671 if (mld_in_v1_mode(idev)) 2672 return; 2673 2674 idev->mc_ifc_count = idev->mc_qrv; 2675 mld_ifc_start_work(idev, 1); 2676 } 2677 2678 static void mld_mca_work(struct work_struct *work) 2679 { 2680 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2681 struct ifmcaddr6, mca_work); 2682 2683 mutex_lock(&ma->idev->mc_lock); 2684 if (mld_in_v1_mode(ma->idev)) 2685 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2686 else 2687 mld_send_report(ma->idev, ma); 2688 ma->mca_flags |= MAF_LAST_REPORTER; 2689 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2690 mutex_unlock(&ma->idev->mc_lock); 2691 2692 ma_put(ma); 2693 } 2694 2695 /* Device changing type */ 2696 2697 void ipv6_mc_unmap(struct inet6_dev *idev) 2698 { 2699 struct ifmcaddr6 *i; 2700 2701 /* Install multicast list, except for all-nodes (already installed) */ 2702 2703 mutex_lock(&idev->mc_lock); 2704 for_each_mc_mclock(idev, i) 2705 igmp6_group_dropped(i); 2706 mutex_unlock(&idev->mc_lock); 2707 } 2708 2709 void ipv6_mc_remap(struct inet6_dev *idev) 2710 { 2711 ipv6_mc_up(idev); 2712 } 2713 2714 /* Device going down */ 2715 void ipv6_mc_down(struct inet6_dev *idev) 2716 { 2717 struct ifmcaddr6 *i; 2718 2719 mutex_lock(&idev->mc_lock); 2720 /* Withdraw multicast list */ 2721 for_each_mc_mclock(idev, i) 2722 igmp6_group_dropped(i); 2723 mutex_unlock(&idev->mc_lock); 2724 2725 /* Should stop work after group drop. or we will 2726 * start work again in mld_ifc_event() 2727 */ 2728 mld_query_stop_work(idev); 2729 mld_report_stop_work(idev); 2730 2731 mutex_lock(&idev->mc_lock); 2732 mld_ifc_stop_work(idev); 2733 mld_gq_stop_work(idev); 2734 mutex_unlock(&idev->mc_lock); 2735 2736 mld_dad_stop_work(idev); 2737 } 2738 2739 static void ipv6_mc_reset(struct inet6_dev *idev) 2740 { 2741 idev->mc_qrv = sysctl_mld_qrv; 2742 idev->mc_qi = MLD_QI_DEFAULT; 2743 idev->mc_qri = MLD_QRI_DEFAULT; 2744 idev->mc_v1_seen = 0; 2745 idev->mc_maxdelay = unsolicited_report_interval(idev); 2746 } 2747 2748 /* Device going up */ 2749 2750 void ipv6_mc_up(struct inet6_dev *idev) 2751 { 2752 struct ifmcaddr6 *i; 2753 2754 /* Install multicast list, except for all-nodes (already installed) */ 2755 2756 ipv6_mc_reset(idev); 2757 mutex_lock(&idev->mc_lock); 2758 for_each_mc_mclock(idev, i) { 2759 mld_del_delrec(idev, i); 2760 igmp6_group_added(i); 2761 } 2762 mutex_unlock(&idev->mc_lock); 2763 } 2764 2765 /* IPv6 device initialization. */ 2766 2767 void ipv6_mc_init_dev(struct inet6_dev *idev) 2768 { 2769 idev->mc_gq_running = 0; 2770 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2771 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2772 idev->mc_ifc_count = 0; 2773 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2774 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2775 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2776 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2777 skb_queue_head_init(&idev->mc_query_queue); 2778 skb_queue_head_init(&idev->mc_report_queue); 2779 spin_lock_init(&idev->mc_query_lock); 2780 spin_lock_init(&idev->mc_report_lock); 2781 mutex_init(&idev->mc_lock); 2782 ipv6_mc_reset(idev); 2783 } 2784 2785 /* 2786 * Device is about to be destroyed: clean up. 2787 */ 2788 2789 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2790 { 2791 struct ifmcaddr6 *i; 2792 2793 /* Deactivate works */ 2794 ipv6_mc_down(idev); 2795 mutex_lock(&idev->mc_lock); 2796 mld_clear_delrec(idev); 2797 mutex_unlock(&idev->mc_lock); 2798 mld_clear_query(idev); 2799 mld_clear_report(idev); 2800 2801 /* Delete all-nodes address. */ 2802 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2803 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2804 * fail. 2805 */ 2806 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2807 2808 if (idev->cnf.forwarding) 2809 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2810 2811 mutex_lock(&idev->mc_lock); 2812 while ((i = mc_dereference(idev->mc_list, idev))) { 2813 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2814 2815 ip6_mc_clear_src(i); 2816 ma_put(i); 2817 } 2818 mutex_unlock(&idev->mc_lock); 2819 } 2820 2821 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2822 { 2823 struct ifmcaddr6 *pmc; 2824 2825 ASSERT_RTNL(); 2826 2827 mutex_lock(&idev->mc_lock); 2828 if (mld_in_v1_mode(idev)) { 2829 for_each_mc_mclock(idev, pmc) 2830 igmp6_join_group(pmc); 2831 } else { 2832 mld_send_report(idev, NULL); 2833 } 2834 mutex_unlock(&idev->mc_lock); 2835 } 2836 2837 static int ipv6_mc_netdev_event(struct notifier_block *this, 2838 unsigned long event, 2839 void *ptr) 2840 { 2841 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2842 struct inet6_dev *idev = __in6_dev_get(dev); 2843 2844 switch (event) { 2845 case NETDEV_RESEND_IGMP: 2846 if (idev) 2847 ipv6_mc_rejoin_groups(idev); 2848 break; 2849 default: 2850 break; 2851 } 2852 2853 return NOTIFY_DONE; 2854 } 2855 2856 static struct notifier_block igmp6_netdev_notifier = { 2857 .notifier_call = ipv6_mc_netdev_event, 2858 }; 2859 2860 #ifdef CONFIG_PROC_FS 2861 struct igmp6_mc_iter_state { 2862 struct seq_net_private p; 2863 struct net_device *dev; 2864 struct inet6_dev *idev; 2865 }; 2866 2867 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2868 2869 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2870 { 2871 struct ifmcaddr6 *im = NULL; 2872 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2873 struct net *net = seq_file_net(seq); 2874 2875 state->idev = NULL; 2876 for_each_netdev_rcu(net, state->dev) { 2877 struct inet6_dev *idev; 2878 idev = __in6_dev_get(state->dev); 2879 if (!idev) 2880 continue; 2881 2882 im = rcu_dereference(idev->mc_list); 2883 if (im) { 2884 state->idev = idev; 2885 break; 2886 } 2887 } 2888 return im; 2889 } 2890 2891 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2892 { 2893 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2894 2895 im = rcu_dereference(im->next); 2896 while (!im) { 2897 state->dev = next_net_device_rcu(state->dev); 2898 if (!state->dev) { 2899 state->idev = NULL; 2900 break; 2901 } 2902 state->idev = __in6_dev_get(state->dev); 2903 if (!state->idev) 2904 continue; 2905 im = rcu_dereference(state->idev->mc_list); 2906 } 2907 return im; 2908 } 2909 2910 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2911 { 2912 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2913 if (im) 2914 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2915 --pos; 2916 return pos ? NULL : im; 2917 } 2918 2919 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2920 __acquires(RCU) 2921 { 2922 rcu_read_lock(); 2923 return igmp6_mc_get_idx(seq, *pos); 2924 } 2925 2926 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2927 { 2928 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2929 2930 ++*pos; 2931 return im; 2932 } 2933 2934 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2935 __releases(RCU) 2936 { 2937 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2938 2939 if (likely(state->idev)) 2940 state->idev = NULL; 2941 state->dev = NULL; 2942 rcu_read_unlock(); 2943 } 2944 2945 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2946 { 2947 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2948 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2949 2950 seq_printf(seq, 2951 "%-4d %-15s %pi6 %5d %08X %ld\n", 2952 state->dev->ifindex, state->dev->name, 2953 &im->mca_addr, 2954 im->mca_users, im->mca_flags, 2955 (im->mca_flags & MAF_TIMER_RUNNING) ? 2956 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2957 return 0; 2958 } 2959 2960 static const struct seq_operations igmp6_mc_seq_ops = { 2961 .start = igmp6_mc_seq_start, 2962 .next = igmp6_mc_seq_next, 2963 .stop = igmp6_mc_seq_stop, 2964 .show = igmp6_mc_seq_show, 2965 }; 2966 2967 struct igmp6_mcf_iter_state { 2968 struct seq_net_private p; 2969 struct net_device *dev; 2970 struct inet6_dev *idev; 2971 struct ifmcaddr6 *im; 2972 }; 2973 2974 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2975 2976 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2977 { 2978 struct ip6_sf_list *psf = NULL; 2979 struct ifmcaddr6 *im = NULL; 2980 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2981 struct net *net = seq_file_net(seq); 2982 2983 state->idev = NULL; 2984 state->im = NULL; 2985 for_each_netdev_rcu(net, state->dev) { 2986 struct inet6_dev *idev; 2987 idev = __in6_dev_get(state->dev); 2988 if (unlikely(idev == NULL)) 2989 continue; 2990 2991 im = rcu_dereference(idev->mc_list); 2992 if (likely(im)) { 2993 psf = rcu_dereference(im->mca_sources); 2994 if (likely(psf)) { 2995 state->im = im; 2996 state->idev = idev; 2997 break; 2998 } 2999 } 3000 } 3001 return psf; 3002 } 3003 3004 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3005 { 3006 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3007 3008 psf = rcu_dereference(psf->sf_next); 3009 while (!psf) { 3010 state->im = rcu_dereference(state->im->next); 3011 while (!state->im) { 3012 state->dev = next_net_device_rcu(state->dev); 3013 if (!state->dev) { 3014 state->idev = NULL; 3015 goto out; 3016 } 3017 state->idev = __in6_dev_get(state->dev); 3018 if (!state->idev) 3019 continue; 3020 state->im = rcu_dereference(state->idev->mc_list); 3021 } 3022 psf = rcu_dereference(state->im->mca_sources); 3023 } 3024 out: 3025 return psf; 3026 } 3027 3028 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3029 { 3030 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3031 if (psf) 3032 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3033 --pos; 3034 return pos ? NULL : psf; 3035 } 3036 3037 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3038 __acquires(RCU) 3039 { 3040 rcu_read_lock(); 3041 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3042 } 3043 3044 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3045 { 3046 struct ip6_sf_list *psf; 3047 if (v == SEQ_START_TOKEN) 3048 psf = igmp6_mcf_get_first(seq); 3049 else 3050 psf = igmp6_mcf_get_next(seq, v); 3051 ++*pos; 3052 return psf; 3053 } 3054 3055 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3056 __releases(RCU) 3057 { 3058 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3059 3060 if (likely(state->im)) 3061 state->im = NULL; 3062 if (likely(state->idev)) 3063 state->idev = NULL; 3064 3065 state->dev = NULL; 3066 rcu_read_unlock(); 3067 } 3068 3069 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3070 { 3071 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3072 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3073 3074 if (v == SEQ_START_TOKEN) { 3075 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3076 } else { 3077 seq_printf(seq, 3078 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3079 state->dev->ifindex, state->dev->name, 3080 &state->im->mca_addr, 3081 &psf->sf_addr, 3082 READ_ONCE(psf->sf_count[MCAST_INCLUDE]), 3083 READ_ONCE(psf->sf_count[MCAST_EXCLUDE])); 3084 } 3085 return 0; 3086 } 3087 3088 static const struct seq_operations igmp6_mcf_seq_ops = { 3089 .start = igmp6_mcf_seq_start, 3090 .next = igmp6_mcf_seq_next, 3091 .stop = igmp6_mcf_seq_stop, 3092 .show = igmp6_mcf_seq_show, 3093 }; 3094 3095 static int __net_init igmp6_proc_init(struct net *net) 3096 { 3097 int err; 3098 3099 err = -ENOMEM; 3100 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3101 sizeof(struct igmp6_mc_iter_state))) 3102 goto out; 3103 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3104 &igmp6_mcf_seq_ops, 3105 sizeof(struct igmp6_mcf_iter_state))) 3106 goto out_proc_net_igmp6; 3107 3108 err = 0; 3109 out: 3110 return err; 3111 3112 out_proc_net_igmp6: 3113 remove_proc_entry("igmp6", net->proc_net); 3114 goto out; 3115 } 3116 3117 static void __net_exit igmp6_proc_exit(struct net *net) 3118 { 3119 remove_proc_entry("mcfilter6", net->proc_net); 3120 remove_proc_entry("igmp6", net->proc_net); 3121 } 3122 #else 3123 static inline int igmp6_proc_init(struct net *net) 3124 { 3125 return 0; 3126 } 3127 static inline void igmp6_proc_exit(struct net *net) 3128 { 3129 } 3130 #endif 3131 3132 static int __net_init igmp6_net_init(struct net *net) 3133 { 3134 int err; 3135 3136 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3137 SOCK_RAW, IPPROTO_ICMPV6, net); 3138 if (err < 0) { 3139 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3140 err); 3141 goto out; 3142 } 3143 3144 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3145 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3146 3147 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3148 SOCK_RAW, IPPROTO_ICMPV6, net); 3149 if (err < 0) { 3150 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3151 err); 3152 goto out_sock_create; 3153 } 3154 3155 err = igmp6_proc_init(net); 3156 if (err) 3157 goto out_sock_create_autojoin; 3158 3159 return 0; 3160 3161 out_sock_create_autojoin: 3162 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3163 out_sock_create: 3164 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3165 out: 3166 return err; 3167 } 3168 3169 static void __net_exit igmp6_net_exit(struct net *net) 3170 { 3171 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3172 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3173 igmp6_proc_exit(net); 3174 } 3175 3176 static struct pernet_operations igmp6_net_ops = { 3177 .init = igmp6_net_init, 3178 .exit = igmp6_net_exit, 3179 }; 3180 3181 int __init igmp6_init(void) 3182 { 3183 int err; 3184 3185 err = register_pernet_subsys(&igmp6_net_ops); 3186 if (err) 3187 return err; 3188 3189 mld_wq = create_workqueue("mld"); 3190 if (!mld_wq) { 3191 unregister_pernet_subsys(&igmp6_net_ops); 3192 return -ENOMEM; 3193 } 3194 3195 return err; 3196 } 3197 3198 int __init igmp6_late_init(void) 3199 { 3200 return register_netdevice_notifier(&igmp6_netdev_notifier); 3201 } 3202 3203 void igmp6_cleanup(void) 3204 { 3205 unregister_pernet_subsys(&igmp6_net_ops); 3206 destroy_workqueue(mld_wq); 3207 } 3208 3209 void igmp6_late_cleanup(void) 3210 { 3211 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3212 } 3213