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 kfree_rcu(psl, rcu); 464 } 465 psl = newpsl; 466 rcu_assign_pointer(pmc->sflist, psl); 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 kfree_rcu(psl, rcu); 569 } else { 570 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 571 } 572 mutex_unlock(&idev->mc_lock); 573 rcu_assign_pointer(pmc->sflist, newpsl); 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 int igmp6_event_query(struct sk_buff *skb) 1375 { 1376 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1377 1378 if (!idev) 1379 return -EINVAL; 1380 1381 if (idev->dead) { 1382 kfree_skb(skb); 1383 return -ENODEV; 1384 } 1385 1386 spin_lock_bh(&idev->mc_query_lock); 1387 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1388 __skb_queue_tail(&idev->mc_query_queue, skb); 1389 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1390 in6_dev_hold(idev); 1391 } 1392 spin_unlock_bh(&idev->mc_query_lock); 1393 1394 return 0; 1395 } 1396 1397 static void __mld_query_work(struct sk_buff *skb) 1398 { 1399 struct mld2_query *mlh2 = NULL; 1400 const struct in6_addr *group; 1401 unsigned long max_delay; 1402 struct inet6_dev *idev; 1403 struct ifmcaddr6 *ma; 1404 struct mld_msg *mld; 1405 int group_type; 1406 int mark = 0; 1407 int len, err; 1408 1409 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1410 goto kfree_skb; 1411 1412 /* compute payload length excluding extension headers */ 1413 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1414 len -= skb_network_header_len(skb); 1415 1416 /* RFC3810 6.2 1417 * Upon reception of an MLD message that contains a Query, the node 1418 * checks if the source address of the message is a valid link-local 1419 * address, if the Hop Limit is set to 1, and if the Router Alert 1420 * option is present in the Hop-By-Hop Options header of the IPv6 1421 * packet. If any of these checks fails, the packet is dropped. 1422 */ 1423 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1424 ipv6_hdr(skb)->hop_limit != 1 || 1425 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1426 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1427 goto kfree_skb; 1428 1429 idev = in6_dev_get(skb->dev); 1430 if (!idev) 1431 goto kfree_skb; 1432 1433 mld = (struct mld_msg *)icmp6_hdr(skb); 1434 group = &mld->mld_mca; 1435 group_type = ipv6_addr_type(group); 1436 1437 if (group_type != IPV6_ADDR_ANY && 1438 !(group_type&IPV6_ADDR_MULTICAST)) 1439 goto out; 1440 1441 if (len < MLD_V1_QUERY_LEN) { 1442 goto out; 1443 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1444 err = mld_process_v1(idev, mld, &max_delay, 1445 len == MLD_V1_QUERY_LEN); 1446 if (err < 0) 1447 goto out; 1448 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1449 int srcs_offset = sizeof(struct mld2_query) - 1450 sizeof(struct icmp6hdr); 1451 1452 if (!pskb_may_pull(skb, srcs_offset)) 1453 goto out; 1454 1455 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1456 1457 mld_process_v2(idev, mlh2, &max_delay); 1458 1459 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1460 if (mlh2->mld2q_nsrcs) 1461 goto out; /* no sources allowed */ 1462 1463 mld_gq_start_work(idev); 1464 goto out; 1465 } 1466 /* mark sources to include, if group & source-specific */ 1467 if (mlh2->mld2q_nsrcs != 0) { 1468 if (!pskb_may_pull(skb, srcs_offset + 1469 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1470 goto out; 1471 1472 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1473 mark = 1; 1474 } 1475 } else { 1476 goto out; 1477 } 1478 1479 if (group_type == IPV6_ADDR_ANY) { 1480 for_each_mc_mclock(idev, ma) { 1481 igmp6_group_queried(ma, max_delay); 1482 } 1483 } else { 1484 for_each_mc_mclock(idev, ma) { 1485 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1486 continue; 1487 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1488 /* gsquery <- gsquery && mark */ 1489 if (!mark) 1490 ma->mca_flags &= ~MAF_GSQUERY; 1491 } else { 1492 /* gsquery <- mark */ 1493 if (mark) 1494 ma->mca_flags |= MAF_GSQUERY; 1495 else 1496 ma->mca_flags &= ~MAF_GSQUERY; 1497 } 1498 if (!(ma->mca_flags & MAF_GSQUERY) || 1499 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1500 igmp6_group_queried(ma, max_delay); 1501 break; 1502 } 1503 } 1504 1505 out: 1506 in6_dev_put(idev); 1507 kfree_skb: 1508 consume_skb(skb); 1509 } 1510 1511 static void mld_query_work(struct work_struct *work) 1512 { 1513 struct inet6_dev *idev = container_of(to_delayed_work(work), 1514 struct inet6_dev, 1515 mc_query_work); 1516 struct sk_buff_head q; 1517 struct sk_buff *skb; 1518 bool rework = false; 1519 int cnt = 0; 1520 1521 skb_queue_head_init(&q); 1522 1523 spin_lock_bh(&idev->mc_query_lock); 1524 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1525 __skb_queue_tail(&q, skb); 1526 1527 if (++cnt >= MLD_MAX_QUEUE) { 1528 rework = true; 1529 schedule_delayed_work(&idev->mc_query_work, 0); 1530 break; 1531 } 1532 } 1533 spin_unlock_bh(&idev->mc_query_lock); 1534 1535 mutex_lock(&idev->mc_lock); 1536 while ((skb = __skb_dequeue(&q))) 1537 __mld_query_work(skb); 1538 mutex_unlock(&idev->mc_lock); 1539 1540 if (!rework) 1541 in6_dev_put(idev); 1542 } 1543 1544 /* called with rcu_read_lock() */ 1545 int igmp6_event_report(struct sk_buff *skb) 1546 { 1547 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1548 1549 if (!idev) 1550 return -EINVAL; 1551 1552 if (idev->dead) { 1553 kfree_skb(skb); 1554 return -ENODEV; 1555 } 1556 1557 spin_lock_bh(&idev->mc_report_lock); 1558 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1559 __skb_queue_tail(&idev->mc_report_queue, skb); 1560 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1561 in6_dev_hold(idev); 1562 } 1563 spin_unlock_bh(&idev->mc_report_lock); 1564 1565 return 0; 1566 } 1567 1568 static void __mld_report_work(struct sk_buff *skb) 1569 { 1570 struct inet6_dev *idev; 1571 struct ifmcaddr6 *ma; 1572 struct mld_msg *mld; 1573 int addr_type; 1574 1575 /* Our own report looped back. Ignore it. */ 1576 if (skb->pkt_type == PACKET_LOOPBACK) 1577 goto kfree_skb; 1578 1579 /* send our report if the MC router may not have heard this report */ 1580 if (skb->pkt_type != PACKET_MULTICAST && 1581 skb->pkt_type != PACKET_BROADCAST) 1582 goto kfree_skb; 1583 1584 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1585 goto kfree_skb; 1586 1587 mld = (struct mld_msg *)icmp6_hdr(skb); 1588 1589 /* Drop reports with not link local source */ 1590 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1591 if (addr_type != IPV6_ADDR_ANY && 1592 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1593 goto kfree_skb; 1594 1595 idev = in6_dev_get(skb->dev); 1596 if (!idev) 1597 goto kfree_skb; 1598 1599 /* 1600 * Cancel the work for this group 1601 */ 1602 1603 for_each_mc_mclock(idev, ma) { 1604 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1605 if (cancel_delayed_work(&ma->mca_work)) 1606 refcount_dec(&ma->mca_refcnt); 1607 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1608 MAF_TIMER_RUNNING); 1609 break; 1610 } 1611 } 1612 1613 in6_dev_put(idev); 1614 kfree_skb: 1615 consume_skb(skb); 1616 } 1617 1618 static void mld_report_work(struct work_struct *work) 1619 { 1620 struct inet6_dev *idev = container_of(to_delayed_work(work), 1621 struct inet6_dev, 1622 mc_report_work); 1623 struct sk_buff_head q; 1624 struct sk_buff *skb; 1625 bool rework = false; 1626 int cnt = 0; 1627 1628 skb_queue_head_init(&q); 1629 spin_lock_bh(&idev->mc_report_lock); 1630 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1631 __skb_queue_tail(&q, skb); 1632 1633 if (++cnt >= MLD_MAX_QUEUE) { 1634 rework = true; 1635 schedule_delayed_work(&idev->mc_report_work, 0); 1636 break; 1637 } 1638 } 1639 spin_unlock_bh(&idev->mc_report_lock); 1640 1641 mutex_lock(&idev->mc_lock); 1642 while ((skb = __skb_dequeue(&q))) 1643 __mld_report_work(skb); 1644 mutex_unlock(&idev->mc_lock); 1645 1646 if (!rework) 1647 in6_dev_put(idev); 1648 } 1649 1650 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1651 int gdeleted, int sdeleted) 1652 { 1653 switch (type) { 1654 case MLD2_MODE_IS_INCLUDE: 1655 case MLD2_MODE_IS_EXCLUDE: 1656 if (gdeleted || sdeleted) 1657 return false; 1658 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1659 if (pmc->mca_sfmode == MCAST_INCLUDE) 1660 return true; 1661 /* don't include if this source is excluded 1662 * in all filters 1663 */ 1664 if (psf->sf_count[MCAST_INCLUDE]) 1665 return type == MLD2_MODE_IS_INCLUDE; 1666 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1667 psf->sf_count[MCAST_EXCLUDE]; 1668 } 1669 return false; 1670 case MLD2_CHANGE_TO_INCLUDE: 1671 if (gdeleted || sdeleted) 1672 return false; 1673 return psf->sf_count[MCAST_INCLUDE] != 0; 1674 case MLD2_CHANGE_TO_EXCLUDE: 1675 if (gdeleted || sdeleted) 1676 return false; 1677 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1678 psf->sf_count[MCAST_INCLUDE]) 1679 return false; 1680 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1681 psf->sf_count[MCAST_EXCLUDE]; 1682 case MLD2_ALLOW_NEW_SOURCES: 1683 if (gdeleted || !psf->sf_crcount) 1684 return false; 1685 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1686 case MLD2_BLOCK_OLD_SOURCES: 1687 if (pmc->mca_sfmode == MCAST_INCLUDE) 1688 return gdeleted || (psf->sf_crcount && sdeleted); 1689 return psf->sf_crcount && !gdeleted && !sdeleted; 1690 } 1691 return false; 1692 } 1693 1694 static int 1695 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1696 { 1697 struct ip6_sf_list *psf; 1698 int scount = 0; 1699 1700 for_each_psf_mclock(pmc, psf) { 1701 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1702 continue; 1703 scount++; 1704 } 1705 return scount; 1706 } 1707 1708 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1709 struct net_device *dev, 1710 const struct in6_addr *saddr, 1711 const struct in6_addr *daddr, 1712 int proto, int len) 1713 { 1714 struct ipv6hdr *hdr; 1715 1716 skb->protocol = htons(ETH_P_IPV6); 1717 skb->dev = dev; 1718 1719 skb_reset_network_header(skb); 1720 skb_put(skb, sizeof(struct ipv6hdr)); 1721 hdr = ipv6_hdr(skb); 1722 1723 ip6_flow_hdr(hdr, 0, 0); 1724 1725 hdr->payload_len = htons(len); 1726 hdr->nexthdr = proto; 1727 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1728 1729 hdr->saddr = *saddr; 1730 hdr->daddr = *daddr; 1731 } 1732 1733 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1734 { 1735 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 1736 2, 0, 0, IPV6_TLV_PADN, 0 }; 1737 struct net_device *dev = idev->dev; 1738 int hlen = LL_RESERVED_SPACE(dev); 1739 int tlen = dev->needed_tailroom; 1740 struct net *net = dev_net(dev); 1741 const struct in6_addr *saddr; 1742 struct in6_addr addr_buf; 1743 struct mld2_report *pmr; 1744 struct sk_buff *skb; 1745 unsigned int size; 1746 struct sock *sk; 1747 int err; 1748 1749 sk = net->ipv6.igmp_sk; 1750 /* we assume size > sizeof(ra) here 1751 * Also try to not allocate high-order pages for big MTU 1752 */ 1753 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; 1754 skb = sock_alloc_send_skb(sk, size, 1, &err); 1755 if (!skb) 1756 return NULL; 1757 1758 skb->priority = TC_PRIO_CONTROL; 1759 skb_reserve(skb, hlen); 1760 skb_tailroom_reserve(skb, mtu, tlen); 1761 1762 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1763 /* <draft-ietf-magma-mld-source-05.txt>: 1764 * use unspecified address as the source address 1765 * when a valid link-local address is not available. 1766 */ 1767 saddr = &in6addr_any; 1768 } else 1769 saddr = &addr_buf; 1770 1771 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1772 1773 skb_put_data(skb, ra, sizeof(ra)); 1774 1775 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1776 skb_put(skb, sizeof(*pmr)); 1777 pmr = (struct mld2_report *)skb_transport_header(skb); 1778 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1779 pmr->mld2r_resv1 = 0; 1780 pmr->mld2r_cksum = 0; 1781 pmr->mld2r_resv2 = 0; 1782 pmr->mld2r_ngrec = 0; 1783 return skb; 1784 } 1785 1786 static void mld_sendpack(struct sk_buff *skb) 1787 { 1788 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1789 struct mld2_report *pmr = 1790 (struct mld2_report *)skb_transport_header(skb); 1791 int payload_len, mldlen; 1792 struct inet6_dev *idev; 1793 struct net *net = dev_net(skb->dev); 1794 int err; 1795 struct flowi6 fl6; 1796 struct dst_entry *dst; 1797 1798 rcu_read_lock(); 1799 idev = __in6_dev_get(skb->dev); 1800 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1801 1802 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1803 sizeof(*pip6); 1804 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1805 pip6->payload_len = htons(payload_len); 1806 1807 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1808 IPPROTO_ICMPV6, 1809 csum_partial(skb_transport_header(skb), 1810 mldlen, 0)); 1811 1812 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1813 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1814 skb->dev->ifindex); 1815 dst = icmp6_dst_alloc(skb->dev, &fl6); 1816 1817 err = 0; 1818 if (IS_ERR(dst)) { 1819 err = PTR_ERR(dst); 1820 dst = NULL; 1821 } 1822 skb_dst_set(skb, dst); 1823 if (err) 1824 goto err_out; 1825 1826 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1827 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1828 dst_output); 1829 out: 1830 if (!err) { 1831 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1832 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1833 } else { 1834 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1835 } 1836 1837 rcu_read_unlock(); 1838 return; 1839 1840 err_out: 1841 kfree_skb(skb); 1842 goto out; 1843 } 1844 1845 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1846 { 1847 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1848 } 1849 1850 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1851 int type, struct mld2_grec **ppgr, unsigned int mtu) 1852 { 1853 struct mld2_report *pmr; 1854 struct mld2_grec *pgr; 1855 1856 if (!skb) { 1857 skb = mld_newpack(pmc->idev, mtu); 1858 if (!skb) 1859 return NULL; 1860 } 1861 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1862 pgr->grec_type = type; 1863 pgr->grec_auxwords = 0; 1864 pgr->grec_nsrcs = 0; 1865 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1866 pmr = (struct mld2_report *)skb_transport_header(skb); 1867 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1868 *ppgr = pgr; 1869 return skb; 1870 } 1871 1872 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1873 1874 /* called with mc_lock */ 1875 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1876 int type, int gdeleted, int sdeleted, 1877 int crsend) 1878 { 1879 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1880 int scount, stotal, first, isquery, truncate; 1881 struct ip6_sf_list __rcu **psf_list; 1882 struct inet6_dev *idev = pmc->idev; 1883 struct net_device *dev = idev->dev; 1884 struct mld2_grec *pgr = NULL; 1885 struct mld2_report *pmr; 1886 unsigned int mtu; 1887 1888 if (pmc->mca_flags & MAF_NOREPORT) 1889 return skb; 1890 1891 mtu = READ_ONCE(dev->mtu); 1892 if (mtu < IPV6_MIN_MTU) 1893 return skb; 1894 1895 isquery = type == MLD2_MODE_IS_INCLUDE || 1896 type == MLD2_MODE_IS_EXCLUDE; 1897 truncate = type == MLD2_MODE_IS_EXCLUDE || 1898 type == MLD2_CHANGE_TO_EXCLUDE; 1899 1900 stotal = scount = 0; 1901 1902 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1903 1904 if (!rcu_access_pointer(*psf_list)) 1905 goto empty_source; 1906 1907 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1908 1909 /* EX and TO_EX get a fresh packet, if needed */ 1910 if (truncate) { 1911 if (pmr && pmr->mld2r_ngrec && 1912 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1913 if (skb) 1914 mld_sendpack(skb); 1915 skb = mld_newpack(idev, mtu); 1916 } 1917 } 1918 first = 1; 1919 psf_prev = NULL; 1920 for (psf = mc_dereference(*psf_list, idev); 1921 psf; 1922 psf = psf_next) { 1923 struct in6_addr *psrc; 1924 1925 psf_next = mc_dereference(psf->sf_next, idev); 1926 1927 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1928 psf_prev = psf; 1929 continue; 1930 } 1931 1932 /* Based on RFC3810 6.1. Should not send source-list change 1933 * records when there is a filter mode change. 1934 */ 1935 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1936 (!gdeleted && pmc->mca_crcount)) && 1937 (type == MLD2_ALLOW_NEW_SOURCES || 1938 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1939 goto decrease_sf_crcount; 1940 1941 /* clear marks on query responses */ 1942 if (isquery) 1943 psf->sf_gsresp = 0; 1944 1945 if (AVAILABLE(skb) < sizeof(*psrc) + 1946 first*sizeof(struct mld2_grec)) { 1947 if (truncate && !first) 1948 break; /* truncate these */ 1949 if (pgr) 1950 pgr->grec_nsrcs = htons(scount); 1951 if (skb) 1952 mld_sendpack(skb); 1953 skb = mld_newpack(idev, mtu); 1954 first = 1; 1955 scount = 0; 1956 } 1957 if (first) { 1958 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1959 first = 0; 1960 } 1961 if (!skb) 1962 return NULL; 1963 psrc = skb_put(skb, sizeof(*psrc)); 1964 *psrc = psf->sf_addr; 1965 scount++; stotal++; 1966 if ((type == MLD2_ALLOW_NEW_SOURCES || 1967 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1968 decrease_sf_crcount: 1969 psf->sf_crcount--; 1970 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1971 if (psf_prev) 1972 rcu_assign_pointer(psf_prev->sf_next, 1973 mc_dereference(psf->sf_next, idev)); 1974 else 1975 rcu_assign_pointer(*psf_list, 1976 mc_dereference(psf->sf_next, idev)); 1977 kfree_rcu(psf, rcu); 1978 continue; 1979 } 1980 } 1981 psf_prev = psf; 1982 } 1983 1984 empty_source: 1985 if (!stotal) { 1986 if (type == MLD2_ALLOW_NEW_SOURCES || 1987 type == MLD2_BLOCK_OLD_SOURCES) 1988 return skb; 1989 if (pmc->mca_crcount || isquery || crsend) { 1990 /* make sure we have room for group header */ 1991 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1992 mld_sendpack(skb); 1993 skb = NULL; /* add_grhead will get a new one */ 1994 } 1995 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1996 } 1997 } 1998 if (pgr) 1999 pgr->grec_nsrcs = htons(scount); 2000 2001 if (isquery) 2002 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 2003 return skb; 2004 } 2005 2006 /* called with mc_lock */ 2007 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2008 { 2009 struct sk_buff *skb = NULL; 2010 int type; 2011 2012 if (!pmc) { 2013 for_each_mc_mclock(idev, pmc) { 2014 if (pmc->mca_flags & MAF_NOREPORT) 2015 continue; 2016 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2017 type = MLD2_MODE_IS_EXCLUDE; 2018 else 2019 type = MLD2_MODE_IS_INCLUDE; 2020 skb = add_grec(skb, pmc, type, 0, 0, 0); 2021 } 2022 } else { 2023 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2024 type = MLD2_MODE_IS_EXCLUDE; 2025 else 2026 type = MLD2_MODE_IS_INCLUDE; 2027 skb = add_grec(skb, pmc, type, 0, 0, 0); 2028 } 2029 if (skb) 2030 mld_sendpack(skb); 2031 } 2032 2033 /* 2034 * remove zero-count source records from a source filter list 2035 * called with mc_lock 2036 */ 2037 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2038 { 2039 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2040 2041 psf_prev = NULL; 2042 for (psf = mc_dereference(*ppsf, idev); 2043 psf; 2044 psf = psf_next) { 2045 psf_next = mc_dereference(psf->sf_next, idev); 2046 if (psf->sf_crcount == 0) { 2047 if (psf_prev) 2048 rcu_assign_pointer(psf_prev->sf_next, 2049 mc_dereference(psf->sf_next, idev)); 2050 else 2051 rcu_assign_pointer(*ppsf, 2052 mc_dereference(psf->sf_next, idev)); 2053 kfree_rcu(psf, rcu); 2054 } else { 2055 psf_prev = psf; 2056 } 2057 } 2058 } 2059 2060 /* called with mc_lock */ 2061 static void mld_send_cr(struct inet6_dev *idev) 2062 { 2063 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2064 struct sk_buff *skb = NULL; 2065 int type, dtype; 2066 2067 /* deleted MCA's */ 2068 pmc_prev = NULL; 2069 for (pmc = mc_dereference(idev->mc_tomb, idev); 2070 pmc; 2071 pmc = pmc_next) { 2072 pmc_next = mc_dereference(pmc->next, idev); 2073 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2074 type = MLD2_BLOCK_OLD_SOURCES; 2075 dtype = MLD2_BLOCK_OLD_SOURCES; 2076 skb = add_grec(skb, pmc, type, 1, 0, 0); 2077 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2078 } 2079 if (pmc->mca_crcount) { 2080 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2081 type = MLD2_CHANGE_TO_INCLUDE; 2082 skb = add_grec(skb, pmc, type, 1, 0, 0); 2083 } 2084 pmc->mca_crcount--; 2085 if (pmc->mca_crcount == 0) { 2086 mld_clear_zeros(&pmc->mca_tomb, idev); 2087 mld_clear_zeros(&pmc->mca_sources, idev); 2088 } 2089 } 2090 if (pmc->mca_crcount == 0 && 2091 !rcu_access_pointer(pmc->mca_tomb) && 2092 !rcu_access_pointer(pmc->mca_sources)) { 2093 if (pmc_prev) 2094 rcu_assign_pointer(pmc_prev->next, pmc_next); 2095 else 2096 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2097 in6_dev_put(pmc->idev); 2098 kfree_rcu(pmc, rcu); 2099 } else 2100 pmc_prev = pmc; 2101 } 2102 2103 /* change recs */ 2104 for_each_mc_mclock(idev, pmc) { 2105 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2106 type = MLD2_BLOCK_OLD_SOURCES; 2107 dtype = MLD2_ALLOW_NEW_SOURCES; 2108 } else { 2109 type = MLD2_ALLOW_NEW_SOURCES; 2110 dtype = MLD2_BLOCK_OLD_SOURCES; 2111 } 2112 skb = add_grec(skb, pmc, type, 0, 0, 0); 2113 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2114 2115 /* filter mode changes */ 2116 if (pmc->mca_crcount) { 2117 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2118 type = MLD2_CHANGE_TO_EXCLUDE; 2119 else 2120 type = MLD2_CHANGE_TO_INCLUDE; 2121 skb = add_grec(skb, pmc, type, 0, 0, 0); 2122 pmc->mca_crcount--; 2123 } 2124 } 2125 if (!skb) 2126 return; 2127 (void) mld_sendpack(skb); 2128 } 2129 2130 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2131 { 2132 struct net *net = dev_net(dev); 2133 struct sock *sk = net->ipv6.igmp_sk; 2134 struct inet6_dev *idev; 2135 struct sk_buff *skb; 2136 struct mld_msg *hdr; 2137 const struct in6_addr *snd_addr, *saddr; 2138 struct in6_addr addr_buf; 2139 int hlen = LL_RESERVED_SPACE(dev); 2140 int tlen = dev->needed_tailroom; 2141 int err, len, payload_len, full_len; 2142 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2143 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2144 IPV6_TLV_PADN, 0 }; 2145 struct flowi6 fl6; 2146 struct dst_entry *dst; 2147 2148 if (type == ICMPV6_MGM_REDUCTION) 2149 snd_addr = &in6addr_linklocal_allrouters; 2150 else 2151 snd_addr = addr; 2152 2153 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2154 payload_len = len + sizeof(ra); 2155 full_len = sizeof(struct ipv6hdr) + payload_len; 2156 2157 rcu_read_lock(); 2158 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 2159 IPSTATS_MIB_OUT, full_len); 2160 rcu_read_unlock(); 2161 2162 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2163 2164 if (!skb) { 2165 rcu_read_lock(); 2166 IP6_INC_STATS(net, __in6_dev_get(dev), 2167 IPSTATS_MIB_OUTDISCARDS); 2168 rcu_read_unlock(); 2169 return; 2170 } 2171 skb->priority = TC_PRIO_CONTROL; 2172 skb_reserve(skb, hlen); 2173 2174 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2175 /* <draft-ietf-magma-mld-source-05.txt>: 2176 * use unspecified address as the source address 2177 * when a valid link-local address is not available. 2178 */ 2179 saddr = &in6addr_any; 2180 } else 2181 saddr = &addr_buf; 2182 2183 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2184 2185 skb_put_data(skb, ra, sizeof(ra)); 2186 2187 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2188 hdr->mld_type = type; 2189 hdr->mld_mca = *addr; 2190 2191 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2192 IPPROTO_ICMPV6, 2193 csum_partial(hdr, len, 0)); 2194 2195 rcu_read_lock(); 2196 idev = __in6_dev_get(skb->dev); 2197 2198 icmpv6_flow_init(sk, &fl6, type, 2199 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2200 skb->dev->ifindex); 2201 dst = icmp6_dst_alloc(skb->dev, &fl6); 2202 if (IS_ERR(dst)) { 2203 err = PTR_ERR(dst); 2204 goto err_out; 2205 } 2206 2207 skb_dst_set(skb, dst); 2208 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2209 net, sk, skb, NULL, skb->dev, 2210 dst_output); 2211 out: 2212 if (!err) { 2213 ICMP6MSGOUT_INC_STATS(net, idev, type); 2214 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2215 } else 2216 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2217 2218 rcu_read_unlock(); 2219 return; 2220 2221 err_out: 2222 kfree_skb(skb); 2223 goto out; 2224 } 2225 2226 /* called with mc_lock */ 2227 static void mld_send_initial_cr(struct inet6_dev *idev) 2228 { 2229 struct sk_buff *skb; 2230 struct ifmcaddr6 *pmc; 2231 int type; 2232 2233 if (mld_in_v1_mode(idev)) 2234 return; 2235 2236 skb = NULL; 2237 for_each_mc_mclock(idev, pmc) { 2238 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2239 type = MLD2_CHANGE_TO_EXCLUDE; 2240 else 2241 type = MLD2_ALLOW_NEW_SOURCES; 2242 skb = add_grec(skb, pmc, type, 0, 0, 1); 2243 } 2244 if (skb) 2245 mld_sendpack(skb); 2246 } 2247 2248 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2249 { 2250 mutex_lock(&idev->mc_lock); 2251 idev->mc_dad_count = idev->mc_qrv; 2252 if (idev->mc_dad_count) { 2253 mld_send_initial_cr(idev); 2254 idev->mc_dad_count--; 2255 if (idev->mc_dad_count) 2256 mld_dad_start_work(idev, 2257 unsolicited_report_interval(idev)); 2258 } 2259 mutex_unlock(&idev->mc_lock); 2260 } 2261 2262 static void mld_dad_work(struct work_struct *work) 2263 { 2264 struct inet6_dev *idev = container_of(to_delayed_work(work), 2265 struct inet6_dev, 2266 mc_dad_work); 2267 mutex_lock(&idev->mc_lock); 2268 mld_send_initial_cr(idev); 2269 if (idev->mc_dad_count) { 2270 idev->mc_dad_count--; 2271 if (idev->mc_dad_count) 2272 mld_dad_start_work(idev, 2273 unsolicited_report_interval(idev)); 2274 } 2275 mutex_unlock(&idev->mc_lock); 2276 in6_dev_put(idev); 2277 } 2278 2279 /* called with mc_lock */ 2280 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2281 const struct in6_addr *psfsrc) 2282 { 2283 struct ip6_sf_list *psf, *psf_prev; 2284 int rv = 0; 2285 2286 psf_prev = NULL; 2287 for_each_psf_mclock(pmc, psf) { 2288 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2289 break; 2290 psf_prev = psf; 2291 } 2292 if (!psf || psf->sf_count[sfmode] == 0) { 2293 /* source filter not found, or count wrong => bug */ 2294 return -ESRCH; 2295 } 2296 psf->sf_count[sfmode]--; 2297 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2298 struct inet6_dev *idev = pmc->idev; 2299 2300 /* no more filters for this source */ 2301 if (psf_prev) 2302 rcu_assign_pointer(psf_prev->sf_next, 2303 mc_dereference(psf->sf_next, idev)); 2304 else 2305 rcu_assign_pointer(pmc->mca_sources, 2306 mc_dereference(psf->sf_next, idev)); 2307 2308 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2309 !mld_in_v1_mode(idev)) { 2310 psf->sf_crcount = idev->mc_qrv; 2311 rcu_assign_pointer(psf->sf_next, 2312 mc_dereference(pmc->mca_tomb, idev)); 2313 rcu_assign_pointer(pmc->mca_tomb, psf); 2314 rv = 1; 2315 } else { 2316 kfree_rcu(psf, rcu); 2317 } 2318 } 2319 return rv; 2320 } 2321 2322 /* called with mc_lock */ 2323 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2324 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2325 int delta) 2326 { 2327 struct ifmcaddr6 *pmc; 2328 int changerec = 0; 2329 int i, err; 2330 2331 if (!idev) 2332 return -ENODEV; 2333 2334 for_each_mc_mclock(idev, pmc) { 2335 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2336 break; 2337 } 2338 if (!pmc) 2339 return -ESRCH; 2340 2341 sf_markstate(pmc); 2342 if (!delta) { 2343 if (!pmc->mca_sfcount[sfmode]) 2344 return -EINVAL; 2345 2346 pmc->mca_sfcount[sfmode]--; 2347 } 2348 err = 0; 2349 for (i = 0; i < sfcount; i++) { 2350 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2351 2352 changerec |= rv > 0; 2353 if (!err && rv < 0) 2354 err = rv; 2355 } 2356 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2357 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2358 pmc->mca_sfcount[MCAST_INCLUDE]) { 2359 struct ip6_sf_list *psf; 2360 2361 /* filter mode change */ 2362 pmc->mca_sfmode = MCAST_INCLUDE; 2363 pmc->mca_crcount = idev->mc_qrv; 2364 idev->mc_ifc_count = pmc->mca_crcount; 2365 for_each_psf_mclock(pmc, psf) 2366 psf->sf_crcount = 0; 2367 mld_ifc_event(pmc->idev); 2368 } else if (sf_setstate(pmc) || changerec) { 2369 mld_ifc_event(pmc->idev); 2370 } 2371 2372 return err; 2373 } 2374 2375 /* 2376 * Add multicast single-source filter to the interface list 2377 * called with mc_lock 2378 */ 2379 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2380 const struct in6_addr *psfsrc) 2381 { 2382 struct ip6_sf_list *psf, *psf_prev; 2383 2384 psf_prev = NULL; 2385 for_each_psf_mclock(pmc, psf) { 2386 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2387 break; 2388 psf_prev = psf; 2389 } 2390 if (!psf) { 2391 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2392 if (!psf) 2393 return -ENOBUFS; 2394 2395 psf->sf_addr = *psfsrc; 2396 if (psf_prev) { 2397 rcu_assign_pointer(psf_prev->sf_next, psf); 2398 } else { 2399 rcu_assign_pointer(pmc->mca_sources, psf); 2400 } 2401 } 2402 psf->sf_count[sfmode]++; 2403 return 0; 2404 } 2405 2406 /* called with mc_lock */ 2407 static void sf_markstate(struct ifmcaddr6 *pmc) 2408 { 2409 struct ip6_sf_list *psf; 2410 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2411 2412 for_each_psf_mclock(pmc, psf) { 2413 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2414 psf->sf_oldin = mca_xcount == 2415 psf->sf_count[MCAST_EXCLUDE] && 2416 !psf->sf_count[MCAST_INCLUDE]; 2417 } else { 2418 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2419 } 2420 } 2421 } 2422 2423 /* called with mc_lock */ 2424 static int sf_setstate(struct ifmcaddr6 *pmc) 2425 { 2426 struct ip6_sf_list *psf, *dpsf; 2427 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2428 int qrv = pmc->idev->mc_qrv; 2429 int new_in, rv; 2430 2431 rv = 0; 2432 for_each_psf_mclock(pmc, psf) { 2433 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2434 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2435 !psf->sf_count[MCAST_INCLUDE]; 2436 } else 2437 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2438 if (new_in) { 2439 if (!psf->sf_oldin) { 2440 struct ip6_sf_list *prev = NULL; 2441 2442 for_each_psf_tomb(pmc, dpsf) { 2443 if (ipv6_addr_equal(&dpsf->sf_addr, 2444 &psf->sf_addr)) 2445 break; 2446 prev = dpsf; 2447 } 2448 if (dpsf) { 2449 if (prev) 2450 rcu_assign_pointer(prev->sf_next, 2451 mc_dereference(dpsf->sf_next, 2452 pmc->idev)); 2453 else 2454 rcu_assign_pointer(pmc->mca_tomb, 2455 mc_dereference(dpsf->sf_next, 2456 pmc->idev)); 2457 kfree_rcu(dpsf, rcu); 2458 } 2459 psf->sf_crcount = qrv; 2460 rv++; 2461 } 2462 } else if (psf->sf_oldin) { 2463 psf->sf_crcount = 0; 2464 /* 2465 * add or update "delete" records if an active filter 2466 * is now inactive 2467 */ 2468 2469 for_each_psf_tomb(pmc, dpsf) 2470 if (ipv6_addr_equal(&dpsf->sf_addr, 2471 &psf->sf_addr)) 2472 break; 2473 if (!dpsf) { 2474 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2475 if (!dpsf) 2476 continue; 2477 *dpsf = *psf; 2478 rcu_assign_pointer(dpsf->sf_next, 2479 mc_dereference(pmc->mca_tomb, pmc->idev)); 2480 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2481 } 2482 dpsf->sf_crcount = qrv; 2483 rv++; 2484 } 2485 } 2486 return rv; 2487 } 2488 2489 /* 2490 * Add multicast source filter list to the interface list 2491 * called with mc_lock 2492 */ 2493 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2494 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2495 int delta) 2496 { 2497 struct ifmcaddr6 *pmc; 2498 int isexclude; 2499 int i, err; 2500 2501 if (!idev) 2502 return -ENODEV; 2503 2504 for_each_mc_mclock(idev, pmc) { 2505 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2506 break; 2507 } 2508 if (!pmc) 2509 return -ESRCH; 2510 2511 sf_markstate(pmc); 2512 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2513 if (!delta) 2514 pmc->mca_sfcount[sfmode]++; 2515 err = 0; 2516 for (i = 0; i < sfcount; i++) { 2517 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2518 if (err) 2519 break; 2520 } 2521 if (err) { 2522 int j; 2523 2524 if (!delta) 2525 pmc->mca_sfcount[sfmode]--; 2526 for (j = 0; j < i; j++) 2527 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2528 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2529 struct ip6_sf_list *psf; 2530 2531 /* filter mode change */ 2532 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2533 pmc->mca_sfmode = MCAST_EXCLUDE; 2534 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2535 pmc->mca_sfmode = MCAST_INCLUDE; 2536 /* else no filters; keep old mode for reports */ 2537 2538 pmc->mca_crcount = idev->mc_qrv; 2539 idev->mc_ifc_count = pmc->mca_crcount; 2540 for_each_psf_mclock(pmc, psf) 2541 psf->sf_crcount = 0; 2542 mld_ifc_event(idev); 2543 } else if (sf_setstate(pmc)) { 2544 mld_ifc_event(idev); 2545 } 2546 return err; 2547 } 2548 2549 /* called with mc_lock */ 2550 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2551 { 2552 struct ip6_sf_list *psf, *nextpsf; 2553 2554 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2555 psf; 2556 psf = nextpsf) { 2557 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2558 kfree_rcu(psf, rcu); 2559 } 2560 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2561 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2562 psf; 2563 psf = nextpsf) { 2564 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2565 kfree_rcu(psf, rcu); 2566 } 2567 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2568 pmc->mca_sfmode = MCAST_EXCLUDE; 2569 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2570 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2571 } 2572 2573 /* called with mc_lock */ 2574 static void igmp6_join_group(struct ifmcaddr6 *ma) 2575 { 2576 unsigned long delay; 2577 2578 if (ma->mca_flags & MAF_NOREPORT) 2579 return; 2580 2581 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2582 2583 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2584 2585 if (cancel_delayed_work(&ma->mca_work)) { 2586 refcount_dec(&ma->mca_refcnt); 2587 delay = ma->mca_work.timer.expires - jiffies; 2588 } 2589 2590 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2591 refcount_inc(&ma->mca_refcnt); 2592 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2593 } 2594 2595 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2596 struct inet6_dev *idev) 2597 { 2598 struct ip6_sf_socklist *psl; 2599 int err; 2600 2601 psl = sock_dereference(iml->sflist, sk); 2602 2603 if (idev) 2604 mutex_lock(&idev->mc_lock); 2605 2606 if (!psl) { 2607 /* any-source empty exclude case */ 2608 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2609 } else { 2610 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2611 psl->sl_count, psl->sl_addr, 0); 2612 RCU_INIT_POINTER(iml->sflist, NULL); 2613 atomic_sub(struct_size(psl, sl_addr, psl->sl_max), 2614 &sk->sk_omem_alloc); 2615 kfree_rcu(psl, rcu); 2616 } 2617 2618 if (idev) 2619 mutex_unlock(&idev->mc_lock); 2620 2621 return err; 2622 } 2623 2624 /* called with mc_lock */ 2625 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2626 { 2627 if (mld_in_v1_mode(ma->idev)) { 2628 if (ma->mca_flags & MAF_LAST_REPORTER) { 2629 igmp6_send(&ma->mca_addr, ma->idev->dev, 2630 ICMPV6_MGM_REDUCTION); 2631 } 2632 } else { 2633 mld_add_delrec(ma->idev, ma); 2634 mld_ifc_event(ma->idev); 2635 } 2636 } 2637 2638 static void mld_gq_work(struct work_struct *work) 2639 { 2640 struct inet6_dev *idev = container_of(to_delayed_work(work), 2641 struct inet6_dev, 2642 mc_gq_work); 2643 2644 mutex_lock(&idev->mc_lock); 2645 mld_send_report(idev, NULL); 2646 idev->mc_gq_running = 0; 2647 mutex_unlock(&idev->mc_lock); 2648 2649 in6_dev_put(idev); 2650 } 2651 2652 static void mld_ifc_work(struct work_struct *work) 2653 { 2654 struct inet6_dev *idev = container_of(to_delayed_work(work), 2655 struct inet6_dev, 2656 mc_ifc_work); 2657 2658 mutex_lock(&idev->mc_lock); 2659 mld_send_cr(idev); 2660 2661 if (idev->mc_ifc_count) { 2662 idev->mc_ifc_count--; 2663 if (idev->mc_ifc_count) 2664 mld_ifc_start_work(idev, 2665 unsolicited_report_interval(idev)); 2666 } 2667 mutex_unlock(&idev->mc_lock); 2668 in6_dev_put(idev); 2669 } 2670 2671 /* called with mc_lock */ 2672 static void mld_ifc_event(struct inet6_dev *idev) 2673 { 2674 if (mld_in_v1_mode(idev)) 2675 return; 2676 2677 idev->mc_ifc_count = idev->mc_qrv; 2678 mld_ifc_start_work(idev, 1); 2679 } 2680 2681 static void mld_mca_work(struct work_struct *work) 2682 { 2683 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2684 struct ifmcaddr6, mca_work); 2685 2686 mutex_lock(&ma->idev->mc_lock); 2687 if (mld_in_v1_mode(ma->idev)) 2688 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2689 else 2690 mld_send_report(ma->idev, ma); 2691 ma->mca_flags |= MAF_LAST_REPORTER; 2692 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2693 mutex_unlock(&ma->idev->mc_lock); 2694 2695 ma_put(ma); 2696 } 2697 2698 /* Device changing type */ 2699 2700 void ipv6_mc_unmap(struct inet6_dev *idev) 2701 { 2702 struct ifmcaddr6 *i; 2703 2704 /* Install multicast list, except for all-nodes (already installed) */ 2705 2706 mutex_lock(&idev->mc_lock); 2707 for_each_mc_mclock(idev, i) 2708 igmp6_group_dropped(i); 2709 mutex_unlock(&idev->mc_lock); 2710 } 2711 2712 void ipv6_mc_remap(struct inet6_dev *idev) 2713 { 2714 ipv6_mc_up(idev); 2715 } 2716 2717 /* Device going down */ 2718 void ipv6_mc_down(struct inet6_dev *idev) 2719 { 2720 struct ifmcaddr6 *i; 2721 2722 mutex_lock(&idev->mc_lock); 2723 /* Withdraw multicast list */ 2724 for_each_mc_mclock(idev, i) 2725 igmp6_group_dropped(i); 2726 mutex_unlock(&idev->mc_lock); 2727 2728 /* Should stop work after group drop. or we will 2729 * start work again in mld_ifc_event() 2730 */ 2731 synchronize_net(); 2732 mld_query_stop_work(idev); 2733 mld_report_stop_work(idev); 2734 mld_ifc_stop_work(idev); 2735 mld_gq_stop_work(idev); 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 if (!state->im) 3023 break; 3024 psf = rcu_dereference(state->im->mca_sources); 3025 } 3026 out: 3027 return psf; 3028 } 3029 3030 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3031 { 3032 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3033 if (psf) 3034 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3035 --pos; 3036 return pos ? NULL : psf; 3037 } 3038 3039 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3040 __acquires(RCU) 3041 { 3042 rcu_read_lock(); 3043 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3044 } 3045 3046 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3047 { 3048 struct ip6_sf_list *psf; 3049 if (v == SEQ_START_TOKEN) 3050 psf = igmp6_mcf_get_first(seq); 3051 else 3052 psf = igmp6_mcf_get_next(seq, v); 3053 ++*pos; 3054 return psf; 3055 } 3056 3057 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3058 __releases(RCU) 3059 { 3060 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3061 3062 if (likely(state->im)) 3063 state->im = NULL; 3064 if (likely(state->idev)) 3065 state->idev = NULL; 3066 3067 state->dev = NULL; 3068 rcu_read_unlock(); 3069 } 3070 3071 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3072 { 3073 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3074 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3075 3076 if (v == SEQ_START_TOKEN) { 3077 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3078 } else { 3079 seq_printf(seq, 3080 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3081 state->dev->ifindex, state->dev->name, 3082 &state->im->mca_addr, 3083 &psf->sf_addr, 3084 psf->sf_count[MCAST_INCLUDE], 3085 psf->sf_count[MCAST_EXCLUDE]); 3086 } 3087 return 0; 3088 } 3089 3090 static const struct seq_operations igmp6_mcf_seq_ops = { 3091 .start = igmp6_mcf_seq_start, 3092 .next = igmp6_mcf_seq_next, 3093 .stop = igmp6_mcf_seq_stop, 3094 .show = igmp6_mcf_seq_show, 3095 }; 3096 3097 static int __net_init igmp6_proc_init(struct net *net) 3098 { 3099 int err; 3100 3101 err = -ENOMEM; 3102 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3103 sizeof(struct igmp6_mc_iter_state))) 3104 goto out; 3105 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3106 &igmp6_mcf_seq_ops, 3107 sizeof(struct igmp6_mcf_iter_state))) 3108 goto out_proc_net_igmp6; 3109 3110 err = 0; 3111 out: 3112 return err; 3113 3114 out_proc_net_igmp6: 3115 remove_proc_entry("igmp6", net->proc_net); 3116 goto out; 3117 } 3118 3119 static void __net_exit igmp6_proc_exit(struct net *net) 3120 { 3121 remove_proc_entry("mcfilter6", net->proc_net); 3122 remove_proc_entry("igmp6", net->proc_net); 3123 } 3124 #else 3125 static inline int igmp6_proc_init(struct net *net) 3126 { 3127 return 0; 3128 } 3129 static inline void igmp6_proc_exit(struct net *net) 3130 { 3131 } 3132 #endif 3133 3134 static int __net_init igmp6_net_init(struct net *net) 3135 { 3136 int err; 3137 3138 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3139 SOCK_RAW, IPPROTO_ICMPV6, net); 3140 if (err < 0) { 3141 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3142 err); 3143 goto out; 3144 } 3145 3146 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3147 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3148 3149 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3150 SOCK_RAW, IPPROTO_ICMPV6, net); 3151 if (err < 0) { 3152 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3153 err); 3154 goto out_sock_create; 3155 } 3156 3157 err = igmp6_proc_init(net); 3158 if (err) 3159 goto out_sock_create_autojoin; 3160 3161 return 0; 3162 3163 out_sock_create_autojoin: 3164 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3165 out_sock_create: 3166 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3167 out: 3168 return err; 3169 } 3170 3171 static void __net_exit igmp6_net_exit(struct net *net) 3172 { 3173 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3174 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3175 igmp6_proc_exit(net); 3176 } 3177 3178 static struct pernet_operations igmp6_net_ops = { 3179 .init = igmp6_net_init, 3180 .exit = igmp6_net_exit, 3181 }; 3182 3183 int __init igmp6_init(void) 3184 { 3185 int err; 3186 3187 err = register_pernet_subsys(&igmp6_net_ops); 3188 if (err) 3189 return err; 3190 3191 mld_wq = create_workqueue("mld"); 3192 if (!mld_wq) { 3193 unregister_pernet_subsys(&igmp6_net_ops); 3194 return -ENOMEM; 3195 } 3196 3197 return err; 3198 } 3199 3200 int __init igmp6_late_init(void) 3201 { 3202 return register_netdevice_notifier(&igmp6_netdev_notifier); 3203 } 3204 3205 void igmp6_cleanup(void) 3206 { 3207 unregister_pernet_subsys(&igmp6_net_ops); 3208 destroy_workqueue(mld_wq); 3209 } 3210 3211 void igmp6_late_cleanup(void) 3212 { 3213 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3214 } 3215