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 void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 79 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 80 static void mld_clear_delrec(struct inet6_dev *idev); 81 static bool mld_in_v1_mode(const struct inet6_dev *idev); 82 static int sf_setstate(struct ifmcaddr6 *pmc); 83 static void sf_markstate(struct ifmcaddr6 *pmc); 84 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 85 static int ip6_mc_del_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_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 89 int sfmode, int sfcount, const struct in6_addr *psfsrc, 90 int delta); 91 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 92 struct inet6_dev *idev); 93 static int __ipv6_dev_mc_inc(struct net_device *dev, 94 const struct in6_addr *addr, unsigned int mode); 95 96 #define MLD_QRV_DEFAULT 2 97 /* RFC3810, 9.2. Query Interval */ 98 #define MLD_QI_DEFAULT (125 * HZ) 99 /* RFC3810, 9.3. Query Response Interval */ 100 #define MLD_QRI_DEFAULT (10 * HZ) 101 102 /* RFC3810, 8.1 Query Version Distinctions */ 103 #define MLD_V1_QUERY_LEN 24 104 #define MLD_V2_QUERY_LEN_MIN 28 105 106 #define IPV6_MLD_MAX_MSF 64 107 108 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 109 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; 110 111 /* 112 * socket join on multicast group 113 */ 114 #define mc_dereference(e, idev) \ 115 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock)) 116 117 #define for_each_pmc_rtnl(np, pmc) \ 118 for (pmc = rtnl_dereference((np)->ipv6_mc_list); \ 119 pmc; \ 120 pmc = rtnl_dereference(pmc->next)) 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_rtnl(np, 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 = rtnl_dereference(*lnk)) != 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 = rtnl_dereference(np->ipv6_mc_list)) != 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 rtnl_lock(); 354 __ipv6_sock_mc_close(sk); 355 rtnl_unlock(); 356 } 357 358 int ip6_mc_source(int add, int omode, struct sock *sk, 359 struct group_source_req *pgsr) 360 { 361 struct in6_addr *source, *group; 362 struct ipv6_mc_socklist *pmc; 363 struct inet6_dev *idev; 364 struct ipv6_pinfo *inet6 = inet6_sk(sk); 365 struct ip6_sf_socklist *psl; 366 struct net *net = sock_net(sk); 367 int i, j, rv; 368 int leavegroup = 0; 369 int err; 370 371 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 372 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 373 374 if (!ipv6_addr_is_multicast(group)) 375 return -EINVAL; 376 377 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface); 378 if (!idev) 379 return -ENODEV; 380 381 err = -EADDRNOTAVAIL; 382 383 mutex_lock(&idev->mc_lock); 384 for_each_pmc_rtnl(inet6, pmc) { 385 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 386 continue; 387 if (ipv6_addr_equal(&pmc->addr, group)) 388 break; 389 } 390 if (!pmc) { /* must have a prior join */ 391 err = -EINVAL; 392 goto done; 393 } 394 /* if a source filter was set, must be the same mode as before */ 395 if (rcu_access_pointer(pmc->sflist)) { 396 if (pmc->sfmode != omode) { 397 err = -EINVAL; 398 goto done; 399 } 400 } else if (pmc->sfmode != omode) { 401 /* allow mode switches for empty-set filters */ 402 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 403 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 404 pmc->sfmode = omode; 405 } 406 407 psl = rtnl_dereference(pmc->sflist); 408 if (!add) { 409 if (!psl) 410 goto done; /* err = -EADDRNOTAVAIL */ 411 rv = !0; 412 for (i = 0; i < psl->sl_count; i++) { 413 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 414 if (rv == 0) 415 break; 416 } 417 if (rv) /* source not found */ 418 goto done; /* err = -EADDRNOTAVAIL */ 419 420 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 421 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 422 leavegroup = 1; 423 goto done; 424 } 425 426 /* update the interface filter */ 427 ip6_mc_del_src(idev, group, omode, 1, source, 1); 428 429 for (j = i+1; j < psl->sl_count; j++) 430 psl->sl_addr[j-1] = psl->sl_addr[j]; 431 psl->sl_count--; 432 err = 0; 433 goto done; 434 } 435 /* else, add a new source to the filter */ 436 437 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 438 err = -ENOBUFS; 439 goto done; 440 } 441 if (!psl || psl->sl_count == psl->sl_max) { 442 struct ip6_sf_socklist *newpsl; 443 int count = IP6_SFBLOCK; 444 445 if (psl) 446 count += psl->sl_max; 447 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_KERNEL); 448 if (!newpsl) { 449 err = -ENOBUFS; 450 goto done; 451 } 452 newpsl->sl_max = count; 453 newpsl->sl_count = count - IP6_SFBLOCK; 454 if (psl) { 455 for (i = 0; i < psl->sl_count; i++) 456 newpsl->sl_addr[i] = psl->sl_addr[i]; 457 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 458 kfree_rcu(psl, rcu); 459 } 460 psl = newpsl; 461 rcu_assign_pointer(pmc->sflist, psl); 462 } 463 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 464 for (i = 0; i < psl->sl_count; i++) { 465 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 466 if (rv == 0) /* There is an error in the address. */ 467 goto done; 468 } 469 for (j = psl->sl_count-1; j >= i; j--) 470 psl->sl_addr[j+1] = psl->sl_addr[j]; 471 psl->sl_addr[i] = *source; 472 psl->sl_count++; 473 err = 0; 474 /* update the interface list */ 475 ip6_mc_add_src(idev, group, omode, 1, source, 1); 476 done: 477 mutex_unlock(&idev->mc_lock); 478 if (leavegroup) 479 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 480 return err; 481 } 482 483 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 484 struct sockaddr_storage *list) 485 { 486 const struct in6_addr *group; 487 struct ipv6_mc_socklist *pmc; 488 struct inet6_dev *idev; 489 struct ipv6_pinfo *inet6 = inet6_sk(sk); 490 struct ip6_sf_socklist *newpsl, *psl; 491 struct net *net = sock_net(sk); 492 int leavegroup = 0; 493 int i, err; 494 495 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 496 497 if (!ipv6_addr_is_multicast(group)) 498 return -EINVAL; 499 if (gsf->gf_fmode != MCAST_INCLUDE && 500 gsf->gf_fmode != MCAST_EXCLUDE) 501 return -EINVAL; 502 503 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface); 504 if (!idev) 505 return -ENODEV; 506 507 err = 0; 508 509 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 510 leavegroup = 1; 511 goto done; 512 } 513 514 for_each_pmc_rtnl(inet6, pmc) { 515 if (pmc->ifindex != gsf->gf_interface) 516 continue; 517 if (ipv6_addr_equal(&pmc->addr, group)) 518 break; 519 } 520 if (!pmc) { /* must have a prior join */ 521 err = -EINVAL; 522 goto done; 523 } 524 if (gsf->gf_numsrc) { 525 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 526 GFP_KERNEL); 527 if (!newpsl) { 528 err = -ENOBUFS; 529 goto done; 530 } 531 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 532 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 533 struct sockaddr_in6 *psin6; 534 535 psin6 = (struct sockaddr_in6 *)list; 536 newpsl->sl_addr[i] = psin6->sin6_addr; 537 } 538 mutex_lock(&idev->mc_lock); 539 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 540 newpsl->sl_count, newpsl->sl_addr, 0); 541 if (err) { 542 mutex_unlock(&idev->mc_lock); 543 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 544 goto done; 545 } 546 mutex_unlock(&idev->mc_lock); 547 } else { 548 newpsl = NULL; 549 mutex_lock(&idev->mc_lock); 550 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 551 mutex_unlock(&idev->mc_lock); 552 } 553 554 mutex_lock(&idev->mc_lock); 555 psl = rtnl_dereference(pmc->sflist); 556 if (psl) { 557 ip6_mc_del_src(idev, group, pmc->sfmode, 558 psl->sl_count, psl->sl_addr, 0); 559 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 560 kfree_rcu(psl, rcu); 561 } else { 562 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 563 } 564 mutex_unlock(&idev->mc_lock); 565 rcu_assign_pointer(pmc->sflist, newpsl); 566 pmc->sfmode = gsf->gf_fmode; 567 err = 0; 568 done: 569 if (leavegroup) 570 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 571 return err; 572 } 573 574 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 575 struct sockaddr_storage __user *p) 576 { 577 int err, i, count, copycount; 578 const struct in6_addr *group; 579 struct ipv6_mc_socklist *pmc; 580 struct inet6_dev *idev; 581 struct ipv6_pinfo *inet6 = inet6_sk(sk); 582 struct ip6_sf_socklist *psl; 583 struct net *net = sock_net(sk); 584 585 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 586 587 if (!ipv6_addr_is_multicast(group)) 588 return -EINVAL; 589 590 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface); 591 if (!idev) 592 return -ENODEV; 593 594 err = -EADDRNOTAVAIL; 595 /* changes to the ipv6_mc_list require the socket lock and 596 * rtnl lock. We have the socket lock and rcu read lock, 597 * so reading the list is safe. 598 */ 599 600 for_each_pmc_rtnl(inet6, 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 err; 608 609 gsf->gf_fmode = pmc->sfmode; 610 psl = rtnl_dereference(pmc->sflist); 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 int 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 0; 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 err = mld_process_v2(idev, mlh2, &max_delay); 1458 if (err < 0) 1459 goto out; 1460 1461 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1462 if (mlh2->mld2q_nsrcs) 1463 goto out; /* no sources allowed */ 1464 1465 mld_gq_start_work(idev); 1466 goto out; 1467 } 1468 /* mark sources to include, if group & source-specific */ 1469 if (mlh2->mld2q_nsrcs != 0) { 1470 if (!pskb_may_pull(skb, srcs_offset + 1471 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1472 goto out; 1473 1474 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1475 mark = 1; 1476 } 1477 } else { 1478 goto out; 1479 } 1480 1481 if (group_type == IPV6_ADDR_ANY) { 1482 for_each_mc_mclock(idev, ma) { 1483 igmp6_group_queried(ma, max_delay); 1484 } 1485 } else { 1486 for_each_mc_mclock(idev, ma) { 1487 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1488 continue; 1489 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1490 /* gsquery <- gsquery && mark */ 1491 if (!mark) 1492 ma->mca_flags &= ~MAF_GSQUERY; 1493 } else { 1494 /* gsquery <- mark */ 1495 if (mark) 1496 ma->mca_flags |= MAF_GSQUERY; 1497 else 1498 ma->mca_flags &= ~MAF_GSQUERY; 1499 } 1500 if (!(ma->mca_flags & MAF_GSQUERY) || 1501 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1502 igmp6_group_queried(ma, max_delay); 1503 break; 1504 } 1505 } 1506 1507 out: 1508 in6_dev_put(idev); 1509 kfree_skb: 1510 consume_skb(skb); 1511 } 1512 1513 static void mld_query_work(struct work_struct *work) 1514 { 1515 struct inet6_dev *idev = container_of(to_delayed_work(work), 1516 struct inet6_dev, 1517 mc_query_work); 1518 struct sk_buff_head q; 1519 struct sk_buff *skb; 1520 bool rework = false; 1521 int cnt = 0; 1522 1523 skb_queue_head_init(&q); 1524 1525 spin_lock_bh(&idev->mc_query_lock); 1526 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1527 __skb_queue_tail(&q, skb); 1528 1529 if (++cnt >= MLD_MAX_QUEUE) { 1530 rework = true; 1531 schedule_delayed_work(&idev->mc_query_work, 0); 1532 break; 1533 } 1534 } 1535 spin_unlock_bh(&idev->mc_query_lock); 1536 1537 mutex_lock(&idev->mc_lock); 1538 while ((skb = __skb_dequeue(&q))) 1539 __mld_query_work(skb); 1540 mutex_unlock(&idev->mc_lock); 1541 1542 if (!rework) 1543 in6_dev_put(idev); 1544 } 1545 1546 /* called with rcu_read_lock() */ 1547 int igmp6_event_report(struct sk_buff *skb) 1548 { 1549 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1550 1551 if (!idev) 1552 return -EINVAL; 1553 1554 if (idev->dead) { 1555 kfree_skb(skb); 1556 return -ENODEV; 1557 } 1558 1559 spin_lock_bh(&idev->mc_report_lock); 1560 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1561 __skb_queue_tail(&idev->mc_report_queue, skb); 1562 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1563 in6_dev_hold(idev); 1564 } 1565 spin_unlock_bh(&idev->mc_report_lock); 1566 1567 return 0; 1568 } 1569 1570 static void __mld_report_work(struct sk_buff *skb) 1571 { 1572 struct inet6_dev *idev; 1573 struct ifmcaddr6 *ma; 1574 struct mld_msg *mld; 1575 int addr_type; 1576 1577 /* Our own report looped back. Ignore it. */ 1578 if (skb->pkt_type == PACKET_LOOPBACK) 1579 goto kfree_skb; 1580 1581 /* send our report if the MC router may not have heard this report */ 1582 if (skb->pkt_type != PACKET_MULTICAST && 1583 skb->pkt_type != PACKET_BROADCAST) 1584 goto kfree_skb; 1585 1586 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1587 goto kfree_skb; 1588 1589 mld = (struct mld_msg *)icmp6_hdr(skb); 1590 1591 /* Drop reports with not link local source */ 1592 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1593 if (addr_type != IPV6_ADDR_ANY && 1594 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1595 goto kfree_skb; 1596 1597 idev = in6_dev_get(skb->dev); 1598 if (!idev) 1599 goto kfree_skb; 1600 1601 /* 1602 * Cancel the work for this group 1603 */ 1604 1605 for_each_mc_mclock(idev, ma) { 1606 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1607 if (cancel_delayed_work(&ma->mca_work)) 1608 refcount_dec(&ma->mca_refcnt); 1609 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1610 MAF_TIMER_RUNNING); 1611 break; 1612 } 1613 } 1614 1615 in6_dev_put(idev); 1616 kfree_skb: 1617 consume_skb(skb); 1618 } 1619 1620 static void mld_report_work(struct work_struct *work) 1621 { 1622 struct inet6_dev *idev = container_of(to_delayed_work(work), 1623 struct inet6_dev, 1624 mc_report_work); 1625 struct sk_buff_head q; 1626 struct sk_buff *skb; 1627 bool rework = false; 1628 int cnt = 0; 1629 1630 skb_queue_head_init(&q); 1631 spin_lock_bh(&idev->mc_report_lock); 1632 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1633 __skb_queue_tail(&q, skb); 1634 1635 if (++cnt >= MLD_MAX_QUEUE) { 1636 rework = true; 1637 schedule_delayed_work(&idev->mc_report_work, 0); 1638 break; 1639 } 1640 } 1641 spin_unlock_bh(&idev->mc_report_lock); 1642 1643 mutex_lock(&idev->mc_lock); 1644 while ((skb = __skb_dequeue(&q))) 1645 __mld_report_work(skb); 1646 mutex_unlock(&idev->mc_lock); 1647 1648 if (!rework) 1649 in6_dev_put(idev); 1650 } 1651 1652 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1653 int gdeleted, int sdeleted) 1654 { 1655 switch (type) { 1656 case MLD2_MODE_IS_INCLUDE: 1657 case MLD2_MODE_IS_EXCLUDE: 1658 if (gdeleted || sdeleted) 1659 return false; 1660 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1661 if (pmc->mca_sfmode == MCAST_INCLUDE) 1662 return true; 1663 /* don't include if this source is excluded 1664 * in all filters 1665 */ 1666 if (psf->sf_count[MCAST_INCLUDE]) 1667 return type == MLD2_MODE_IS_INCLUDE; 1668 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1669 psf->sf_count[MCAST_EXCLUDE]; 1670 } 1671 return false; 1672 case MLD2_CHANGE_TO_INCLUDE: 1673 if (gdeleted || sdeleted) 1674 return false; 1675 return psf->sf_count[MCAST_INCLUDE] != 0; 1676 case MLD2_CHANGE_TO_EXCLUDE: 1677 if (gdeleted || sdeleted) 1678 return false; 1679 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1680 psf->sf_count[MCAST_INCLUDE]) 1681 return false; 1682 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1683 psf->sf_count[MCAST_EXCLUDE]; 1684 case MLD2_ALLOW_NEW_SOURCES: 1685 if (gdeleted || !psf->sf_crcount) 1686 return false; 1687 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1688 case MLD2_BLOCK_OLD_SOURCES: 1689 if (pmc->mca_sfmode == MCAST_INCLUDE) 1690 return gdeleted || (psf->sf_crcount && sdeleted); 1691 return psf->sf_crcount && !gdeleted && !sdeleted; 1692 } 1693 return false; 1694 } 1695 1696 static int 1697 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1698 { 1699 struct ip6_sf_list *psf; 1700 int scount = 0; 1701 1702 for_each_psf_mclock(pmc, psf) { 1703 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1704 continue; 1705 scount++; 1706 } 1707 return scount; 1708 } 1709 1710 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1711 struct net_device *dev, 1712 const struct in6_addr *saddr, 1713 const struct in6_addr *daddr, 1714 int proto, int len) 1715 { 1716 struct ipv6hdr *hdr; 1717 1718 skb->protocol = htons(ETH_P_IPV6); 1719 skb->dev = dev; 1720 1721 skb_reset_network_header(skb); 1722 skb_put(skb, sizeof(struct ipv6hdr)); 1723 hdr = ipv6_hdr(skb); 1724 1725 ip6_flow_hdr(hdr, 0, 0); 1726 1727 hdr->payload_len = htons(len); 1728 hdr->nexthdr = proto; 1729 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1730 1731 hdr->saddr = *saddr; 1732 hdr->daddr = *daddr; 1733 } 1734 1735 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1736 { 1737 struct net_device *dev = idev->dev; 1738 struct net *net = dev_net(dev); 1739 struct sock *sk = net->ipv6.igmp_sk; 1740 struct sk_buff *skb; 1741 struct mld2_report *pmr; 1742 struct in6_addr addr_buf; 1743 const struct in6_addr *saddr; 1744 int hlen = LL_RESERVED_SPACE(dev); 1745 int tlen = dev->needed_tailroom; 1746 unsigned int size = mtu + hlen + tlen; 1747 int err; 1748 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1749 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1750 IPV6_TLV_PADN, 0 }; 1751 1752 /* we assume size > sizeof(ra) here */ 1753 /* limit our allocations to order-0 page */ 1754 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1755 skb = sock_alloc_send_skb(sk, size, 1, &err); 1756 1757 if (!skb) 1758 return NULL; 1759 1760 skb->priority = TC_PRIO_CONTROL; 1761 skb_reserve(skb, hlen); 1762 skb_tailroom_reserve(skb, mtu, tlen); 1763 1764 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1765 /* <draft-ietf-magma-mld-source-05.txt>: 1766 * use unspecified address as the source address 1767 * when a valid link-local address is not available. 1768 */ 1769 saddr = &in6addr_any; 1770 } else 1771 saddr = &addr_buf; 1772 1773 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1774 1775 skb_put_data(skb, ra, sizeof(ra)); 1776 1777 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1778 skb_put(skb, sizeof(*pmr)); 1779 pmr = (struct mld2_report *)skb_transport_header(skb); 1780 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1781 pmr->mld2r_resv1 = 0; 1782 pmr->mld2r_cksum = 0; 1783 pmr->mld2r_resv2 = 0; 1784 pmr->mld2r_ngrec = 0; 1785 return skb; 1786 } 1787 1788 static void mld_sendpack(struct sk_buff *skb) 1789 { 1790 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1791 struct mld2_report *pmr = 1792 (struct mld2_report *)skb_transport_header(skb); 1793 int payload_len, mldlen; 1794 struct inet6_dev *idev; 1795 struct net *net = dev_net(skb->dev); 1796 int err; 1797 struct flowi6 fl6; 1798 struct dst_entry *dst; 1799 1800 rcu_read_lock(); 1801 idev = __in6_dev_get(skb->dev); 1802 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1803 1804 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1805 sizeof(*pip6); 1806 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1807 pip6->payload_len = htons(payload_len); 1808 1809 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1810 IPPROTO_ICMPV6, 1811 csum_partial(skb_transport_header(skb), 1812 mldlen, 0)); 1813 1814 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1815 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1816 skb->dev->ifindex); 1817 dst = icmp6_dst_alloc(skb->dev, &fl6); 1818 1819 err = 0; 1820 if (IS_ERR(dst)) { 1821 err = PTR_ERR(dst); 1822 dst = NULL; 1823 } 1824 skb_dst_set(skb, dst); 1825 if (err) 1826 goto err_out; 1827 1828 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1829 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1830 dst_output); 1831 out: 1832 if (!err) { 1833 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1834 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1835 } else { 1836 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1837 } 1838 1839 rcu_read_unlock(); 1840 return; 1841 1842 err_out: 1843 kfree_skb(skb); 1844 goto out; 1845 } 1846 1847 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1848 { 1849 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1850 } 1851 1852 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1853 int type, struct mld2_grec **ppgr, unsigned int mtu) 1854 { 1855 struct mld2_report *pmr; 1856 struct mld2_grec *pgr; 1857 1858 if (!skb) { 1859 skb = mld_newpack(pmc->idev, mtu); 1860 if (!skb) 1861 return NULL; 1862 } 1863 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1864 pgr->grec_type = type; 1865 pgr->grec_auxwords = 0; 1866 pgr->grec_nsrcs = 0; 1867 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1868 pmr = (struct mld2_report *)skb_transport_header(skb); 1869 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1870 *ppgr = pgr; 1871 return skb; 1872 } 1873 1874 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1875 1876 /* called with mc_lock */ 1877 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1878 int type, int gdeleted, int sdeleted, 1879 int crsend) 1880 { 1881 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1882 int scount, stotal, first, isquery, truncate; 1883 struct ip6_sf_list __rcu **psf_list; 1884 struct inet6_dev *idev = pmc->idev; 1885 struct net_device *dev = idev->dev; 1886 struct mld2_grec *pgr = NULL; 1887 struct mld2_report *pmr; 1888 unsigned int mtu; 1889 1890 if (pmc->mca_flags & MAF_NOREPORT) 1891 return skb; 1892 1893 mtu = READ_ONCE(dev->mtu); 1894 if (mtu < IPV6_MIN_MTU) 1895 return skb; 1896 1897 isquery = type == MLD2_MODE_IS_INCLUDE || 1898 type == MLD2_MODE_IS_EXCLUDE; 1899 truncate = type == MLD2_MODE_IS_EXCLUDE || 1900 type == MLD2_CHANGE_TO_EXCLUDE; 1901 1902 stotal = scount = 0; 1903 1904 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1905 1906 if (!rcu_access_pointer(*psf_list)) 1907 goto empty_source; 1908 1909 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1910 1911 /* EX and TO_EX get a fresh packet, if needed */ 1912 if (truncate) { 1913 if (pmr && pmr->mld2r_ngrec && 1914 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1915 if (skb) 1916 mld_sendpack(skb); 1917 skb = mld_newpack(idev, mtu); 1918 } 1919 } 1920 first = 1; 1921 psf_prev = NULL; 1922 for (psf = mc_dereference(*psf_list, idev); 1923 psf; 1924 psf = psf_next) { 1925 struct in6_addr *psrc; 1926 1927 psf_next = mc_dereference(psf->sf_next, idev); 1928 1929 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1930 psf_prev = psf; 1931 continue; 1932 } 1933 1934 /* Based on RFC3810 6.1. Should not send source-list change 1935 * records when there is a filter mode change. 1936 */ 1937 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1938 (!gdeleted && pmc->mca_crcount)) && 1939 (type == MLD2_ALLOW_NEW_SOURCES || 1940 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1941 goto decrease_sf_crcount; 1942 1943 /* clear marks on query responses */ 1944 if (isquery) 1945 psf->sf_gsresp = 0; 1946 1947 if (AVAILABLE(skb) < sizeof(*psrc) + 1948 first*sizeof(struct mld2_grec)) { 1949 if (truncate && !first) 1950 break; /* truncate these */ 1951 if (pgr) 1952 pgr->grec_nsrcs = htons(scount); 1953 if (skb) 1954 mld_sendpack(skb); 1955 skb = mld_newpack(idev, mtu); 1956 first = 1; 1957 scount = 0; 1958 } 1959 if (first) { 1960 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1961 first = 0; 1962 } 1963 if (!skb) 1964 return NULL; 1965 psrc = skb_put(skb, sizeof(*psrc)); 1966 *psrc = psf->sf_addr; 1967 scount++; stotal++; 1968 if ((type == MLD2_ALLOW_NEW_SOURCES || 1969 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1970 decrease_sf_crcount: 1971 psf->sf_crcount--; 1972 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1973 if (psf_prev) 1974 rcu_assign_pointer(psf_prev->sf_next, 1975 mc_dereference(psf->sf_next, idev)); 1976 else 1977 rcu_assign_pointer(*psf_list, 1978 mc_dereference(psf->sf_next, idev)); 1979 kfree_rcu(psf, rcu); 1980 continue; 1981 } 1982 } 1983 psf_prev = psf; 1984 } 1985 1986 empty_source: 1987 if (!stotal) { 1988 if (type == MLD2_ALLOW_NEW_SOURCES || 1989 type == MLD2_BLOCK_OLD_SOURCES) 1990 return skb; 1991 if (pmc->mca_crcount || isquery || crsend) { 1992 /* make sure we have room for group header */ 1993 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1994 mld_sendpack(skb); 1995 skb = NULL; /* add_grhead will get a new one */ 1996 } 1997 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1998 } 1999 } 2000 if (pgr) 2001 pgr->grec_nsrcs = htons(scount); 2002 2003 if (isquery) 2004 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 2005 return skb; 2006 } 2007 2008 /* called with mc_lock */ 2009 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2010 { 2011 struct sk_buff *skb = NULL; 2012 int type; 2013 2014 if (!pmc) { 2015 for_each_mc_mclock(idev, pmc) { 2016 if (pmc->mca_flags & MAF_NOREPORT) 2017 continue; 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 } else { 2025 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2026 type = MLD2_MODE_IS_EXCLUDE; 2027 else 2028 type = MLD2_MODE_IS_INCLUDE; 2029 skb = add_grec(skb, pmc, type, 0, 0, 0); 2030 } 2031 if (skb) 2032 mld_sendpack(skb); 2033 } 2034 2035 /* 2036 * remove zero-count source records from a source filter list 2037 * called with mc_lock 2038 */ 2039 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2040 { 2041 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2042 2043 psf_prev = NULL; 2044 for (psf = mc_dereference(*ppsf, idev); 2045 psf; 2046 psf = psf_next) { 2047 psf_next = mc_dereference(psf->sf_next, idev); 2048 if (psf->sf_crcount == 0) { 2049 if (psf_prev) 2050 rcu_assign_pointer(psf_prev->sf_next, 2051 mc_dereference(psf->sf_next, idev)); 2052 else 2053 rcu_assign_pointer(*ppsf, 2054 mc_dereference(psf->sf_next, idev)); 2055 kfree_rcu(psf, rcu); 2056 } else { 2057 psf_prev = psf; 2058 } 2059 } 2060 } 2061 2062 /* called with mc_lock */ 2063 static void mld_send_cr(struct inet6_dev *idev) 2064 { 2065 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2066 struct sk_buff *skb = NULL; 2067 int type, dtype; 2068 2069 /* deleted MCA's */ 2070 pmc_prev = NULL; 2071 for (pmc = mc_dereference(idev->mc_tomb, idev); 2072 pmc; 2073 pmc = pmc_next) { 2074 pmc_next = mc_dereference(pmc->next, idev); 2075 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2076 type = MLD2_BLOCK_OLD_SOURCES; 2077 dtype = MLD2_BLOCK_OLD_SOURCES; 2078 skb = add_grec(skb, pmc, type, 1, 0, 0); 2079 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2080 } 2081 if (pmc->mca_crcount) { 2082 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2083 type = MLD2_CHANGE_TO_INCLUDE; 2084 skb = add_grec(skb, pmc, type, 1, 0, 0); 2085 } 2086 pmc->mca_crcount--; 2087 if (pmc->mca_crcount == 0) { 2088 mld_clear_zeros(&pmc->mca_tomb, idev); 2089 mld_clear_zeros(&pmc->mca_sources, idev); 2090 } 2091 } 2092 if (pmc->mca_crcount == 0 && 2093 !rcu_access_pointer(pmc->mca_tomb) && 2094 !rcu_access_pointer(pmc->mca_sources)) { 2095 if (pmc_prev) 2096 rcu_assign_pointer(pmc_prev->next, pmc_next); 2097 else 2098 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2099 in6_dev_put(pmc->idev); 2100 kfree_rcu(pmc, rcu); 2101 } else 2102 pmc_prev = pmc; 2103 } 2104 2105 /* change recs */ 2106 for_each_mc_mclock(idev, pmc) { 2107 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2108 type = MLD2_BLOCK_OLD_SOURCES; 2109 dtype = MLD2_ALLOW_NEW_SOURCES; 2110 } else { 2111 type = MLD2_ALLOW_NEW_SOURCES; 2112 dtype = MLD2_BLOCK_OLD_SOURCES; 2113 } 2114 skb = add_grec(skb, pmc, type, 0, 0, 0); 2115 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2116 2117 /* filter mode changes */ 2118 if (pmc->mca_crcount) { 2119 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2120 type = MLD2_CHANGE_TO_EXCLUDE; 2121 else 2122 type = MLD2_CHANGE_TO_INCLUDE; 2123 skb = add_grec(skb, pmc, type, 0, 0, 0); 2124 pmc->mca_crcount--; 2125 } 2126 } 2127 if (!skb) 2128 return; 2129 (void) mld_sendpack(skb); 2130 } 2131 2132 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2133 { 2134 struct net *net = dev_net(dev); 2135 struct sock *sk = net->ipv6.igmp_sk; 2136 struct inet6_dev *idev; 2137 struct sk_buff *skb; 2138 struct mld_msg *hdr; 2139 const struct in6_addr *snd_addr, *saddr; 2140 struct in6_addr addr_buf; 2141 int hlen = LL_RESERVED_SPACE(dev); 2142 int tlen = dev->needed_tailroom; 2143 int err, len, payload_len, full_len; 2144 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2145 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2146 IPV6_TLV_PADN, 0 }; 2147 struct flowi6 fl6; 2148 struct dst_entry *dst; 2149 2150 if (type == ICMPV6_MGM_REDUCTION) 2151 snd_addr = &in6addr_linklocal_allrouters; 2152 else 2153 snd_addr = addr; 2154 2155 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2156 payload_len = len + sizeof(ra); 2157 full_len = sizeof(struct ipv6hdr) + payload_len; 2158 2159 rcu_read_lock(); 2160 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 2161 IPSTATS_MIB_OUT, full_len); 2162 rcu_read_unlock(); 2163 2164 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2165 2166 if (!skb) { 2167 rcu_read_lock(); 2168 IP6_INC_STATS(net, __in6_dev_get(dev), 2169 IPSTATS_MIB_OUTDISCARDS); 2170 rcu_read_unlock(); 2171 return; 2172 } 2173 skb->priority = TC_PRIO_CONTROL; 2174 skb_reserve(skb, hlen); 2175 2176 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2177 /* <draft-ietf-magma-mld-source-05.txt>: 2178 * use unspecified address as the source address 2179 * when a valid link-local address is not available. 2180 */ 2181 saddr = &in6addr_any; 2182 } else 2183 saddr = &addr_buf; 2184 2185 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2186 2187 skb_put_data(skb, ra, sizeof(ra)); 2188 2189 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2190 hdr->mld_type = type; 2191 hdr->mld_mca = *addr; 2192 2193 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2194 IPPROTO_ICMPV6, 2195 csum_partial(hdr, len, 0)); 2196 2197 rcu_read_lock(); 2198 idev = __in6_dev_get(skb->dev); 2199 2200 icmpv6_flow_init(sk, &fl6, type, 2201 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2202 skb->dev->ifindex); 2203 dst = icmp6_dst_alloc(skb->dev, &fl6); 2204 if (IS_ERR(dst)) { 2205 err = PTR_ERR(dst); 2206 goto err_out; 2207 } 2208 2209 skb_dst_set(skb, dst); 2210 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2211 net, sk, skb, NULL, skb->dev, 2212 dst_output); 2213 out: 2214 if (!err) { 2215 ICMP6MSGOUT_INC_STATS(net, idev, type); 2216 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2217 } else 2218 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2219 2220 rcu_read_unlock(); 2221 return; 2222 2223 err_out: 2224 kfree_skb(skb); 2225 goto out; 2226 } 2227 2228 /* called with mc_lock */ 2229 static void mld_send_initial_cr(struct inet6_dev *idev) 2230 { 2231 struct sk_buff *skb; 2232 struct ifmcaddr6 *pmc; 2233 int type; 2234 2235 if (mld_in_v1_mode(idev)) 2236 return; 2237 2238 skb = NULL; 2239 for_each_mc_mclock(idev, pmc) { 2240 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2241 type = MLD2_CHANGE_TO_EXCLUDE; 2242 else 2243 type = MLD2_ALLOW_NEW_SOURCES; 2244 skb = add_grec(skb, pmc, type, 0, 0, 1); 2245 } 2246 if (skb) 2247 mld_sendpack(skb); 2248 } 2249 2250 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2251 { 2252 mutex_lock(&idev->mc_lock); 2253 idev->mc_dad_count = idev->mc_qrv; 2254 if (idev->mc_dad_count) { 2255 mld_send_initial_cr(idev); 2256 idev->mc_dad_count--; 2257 if (idev->mc_dad_count) 2258 mld_dad_start_work(idev, 2259 unsolicited_report_interval(idev)); 2260 } 2261 mutex_unlock(&idev->mc_lock); 2262 } 2263 2264 static void mld_dad_work(struct work_struct *work) 2265 { 2266 struct inet6_dev *idev = container_of(to_delayed_work(work), 2267 struct inet6_dev, 2268 mc_dad_work); 2269 mutex_lock(&idev->mc_lock); 2270 mld_send_initial_cr(idev); 2271 if (idev->mc_dad_count) { 2272 idev->mc_dad_count--; 2273 if (idev->mc_dad_count) 2274 mld_dad_start_work(idev, 2275 unsolicited_report_interval(idev)); 2276 } 2277 mutex_unlock(&idev->mc_lock); 2278 in6_dev_put(idev); 2279 } 2280 2281 /* called with mc_lock */ 2282 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2283 const struct in6_addr *psfsrc) 2284 { 2285 struct ip6_sf_list *psf, *psf_prev; 2286 int rv = 0; 2287 2288 psf_prev = NULL; 2289 for_each_psf_mclock(pmc, psf) { 2290 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2291 break; 2292 psf_prev = psf; 2293 } 2294 if (!psf || psf->sf_count[sfmode] == 0) { 2295 /* source filter not found, or count wrong => bug */ 2296 return -ESRCH; 2297 } 2298 psf->sf_count[sfmode]--; 2299 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2300 struct inet6_dev *idev = pmc->idev; 2301 2302 /* no more filters for this source */ 2303 if (psf_prev) 2304 rcu_assign_pointer(psf_prev->sf_next, 2305 mc_dereference(psf->sf_next, idev)); 2306 else 2307 rcu_assign_pointer(pmc->mca_sources, 2308 mc_dereference(psf->sf_next, idev)); 2309 2310 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2311 !mld_in_v1_mode(idev)) { 2312 psf->sf_crcount = idev->mc_qrv; 2313 rcu_assign_pointer(psf->sf_next, 2314 mc_dereference(pmc->mca_tomb, idev)); 2315 rcu_assign_pointer(pmc->mca_tomb, psf); 2316 rv = 1; 2317 } else { 2318 kfree_rcu(psf, rcu); 2319 } 2320 } 2321 return rv; 2322 } 2323 2324 /* called with mc_lock */ 2325 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2326 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2327 int delta) 2328 { 2329 struct ifmcaddr6 *pmc; 2330 int changerec = 0; 2331 int i, err; 2332 2333 if (!idev) 2334 return -ENODEV; 2335 2336 for_each_mc_mclock(idev, pmc) { 2337 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2338 break; 2339 } 2340 if (!pmc) 2341 return -ESRCH; 2342 2343 sf_markstate(pmc); 2344 if (!delta) { 2345 if (!pmc->mca_sfcount[sfmode]) 2346 return -EINVAL; 2347 2348 pmc->mca_sfcount[sfmode]--; 2349 } 2350 err = 0; 2351 for (i = 0; i < sfcount; i++) { 2352 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2353 2354 changerec |= rv > 0; 2355 if (!err && rv < 0) 2356 err = rv; 2357 } 2358 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2359 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2360 pmc->mca_sfcount[MCAST_INCLUDE]) { 2361 struct ip6_sf_list *psf; 2362 2363 /* filter mode change */ 2364 pmc->mca_sfmode = MCAST_INCLUDE; 2365 pmc->mca_crcount = idev->mc_qrv; 2366 idev->mc_ifc_count = pmc->mca_crcount; 2367 for_each_psf_mclock(pmc, psf) 2368 psf->sf_crcount = 0; 2369 mld_ifc_event(pmc->idev); 2370 } else if (sf_setstate(pmc) || changerec) { 2371 mld_ifc_event(pmc->idev); 2372 } 2373 2374 return err; 2375 } 2376 2377 /* 2378 * Add multicast single-source filter to the interface list 2379 * called with mc_lock 2380 */ 2381 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2382 const struct in6_addr *psfsrc) 2383 { 2384 struct ip6_sf_list *psf, *psf_prev; 2385 2386 psf_prev = NULL; 2387 for_each_psf_mclock(pmc, psf) { 2388 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2389 break; 2390 psf_prev = psf; 2391 } 2392 if (!psf) { 2393 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2394 if (!psf) 2395 return -ENOBUFS; 2396 2397 psf->sf_addr = *psfsrc; 2398 if (psf_prev) { 2399 rcu_assign_pointer(psf_prev->sf_next, psf); 2400 } else { 2401 rcu_assign_pointer(pmc->mca_sources, psf); 2402 } 2403 } 2404 psf->sf_count[sfmode]++; 2405 return 0; 2406 } 2407 2408 /* called with mc_lock */ 2409 static void sf_markstate(struct ifmcaddr6 *pmc) 2410 { 2411 struct ip6_sf_list *psf; 2412 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2413 2414 for_each_psf_mclock(pmc, psf) { 2415 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2416 psf->sf_oldin = mca_xcount == 2417 psf->sf_count[MCAST_EXCLUDE] && 2418 !psf->sf_count[MCAST_INCLUDE]; 2419 } else { 2420 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2421 } 2422 } 2423 } 2424 2425 /* called with mc_lock */ 2426 static int sf_setstate(struct ifmcaddr6 *pmc) 2427 { 2428 struct ip6_sf_list *psf, *dpsf; 2429 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2430 int qrv = pmc->idev->mc_qrv; 2431 int new_in, rv; 2432 2433 rv = 0; 2434 for_each_psf_mclock(pmc, psf) { 2435 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2436 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2437 !psf->sf_count[MCAST_INCLUDE]; 2438 } else 2439 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2440 if (new_in) { 2441 if (!psf->sf_oldin) { 2442 struct ip6_sf_list *prev = NULL; 2443 2444 for_each_psf_tomb(pmc, dpsf) { 2445 if (ipv6_addr_equal(&dpsf->sf_addr, 2446 &psf->sf_addr)) 2447 break; 2448 prev = dpsf; 2449 } 2450 if (dpsf) { 2451 if (prev) 2452 rcu_assign_pointer(prev->sf_next, 2453 mc_dereference(dpsf->sf_next, 2454 pmc->idev)); 2455 else 2456 rcu_assign_pointer(pmc->mca_tomb, 2457 mc_dereference(dpsf->sf_next, 2458 pmc->idev)); 2459 kfree_rcu(dpsf, rcu); 2460 } 2461 psf->sf_crcount = qrv; 2462 rv++; 2463 } 2464 } else if (psf->sf_oldin) { 2465 psf->sf_crcount = 0; 2466 /* 2467 * add or update "delete" records if an active filter 2468 * is now inactive 2469 */ 2470 2471 for_each_psf_tomb(pmc, dpsf) 2472 if (ipv6_addr_equal(&dpsf->sf_addr, 2473 &psf->sf_addr)) 2474 break; 2475 if (!dpsf) { 2476 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2477 if (!dpsf) 2478 continue; 2479 *dpsf = *psf; 2480 rcu_assign_pointer(dpsf->sf_next, 2481 mc_dereference(pmc->mca_tomb, pmc->idev)); 2482 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2483 } 2484 dpsf->sf_crcount = qrv; 2485 rv++; 2486 } 2487 } 2488 return rv; 2489 } 2490 2491 /* 2492 * Add multicast source filter list to the interface list 2493 * called with mc_lock 2494 */ 2495 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2496 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2497 int delta) 2498 { 2499 struct ifmcaddr6 *pmc; 2500 int isexclude; 2501 int i, err; 2502 2503 if (!idev) 2504 return -ENODEV; 2505 2506 for_each_mc_mclock(idev, pmc) { 2507 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2508 break; 2509 } 2510 if (!pmc) 2511 return -ESRCH; 2512 2513 sf_markstate(pmc); 2514 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2515 if (!delta) 2516 pmc->mca_sfcount[sfmode]++; 2517 err = 0; 2518 for (i = 0; i < sfcount; i++) { 2519 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2520 if (err) 2521 break; 2522 } 2523 if (err) { 2524 int j; 2525 2526 if (!delta) 2527 pmc->mca_sfcount[sfmode]--; 2528 for (j = 0; j < i; j++) 2529 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2530 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2531 struct ip6_sf_list *psf; 2532 2533 /* filter mode change */ 2534 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2535 pmc->mca_sfmode = MCAST_EXCLUDE; 2536 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2537 pmc->mca_sfmode = MCAST_INCLUDE; 2538 /* else no filters; keep old mode for reports */ 2539 2540 pmc->mca_crcount = idev->mc_qrv; 2541 idev->mc_ifc_count = pmc->mca_crcount; 2542 for_each_psf_mclock(pmc, psf) 2543 psf->sf_crcount = 0; 2544 mld_ifc_event(idev); 2545 } else if (sf_setstate(pmc)) { 2546 mld_ifc_event(idev); 2547 } 2548 return err; 2549 } 2550 2551 /* called with mc_lock */ 2552 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2553 { 2554 struct ip6_sf_list *psf, *nextpsf; 2555 2556 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2557 psf; 2558 psf = nextpsf) { 2559 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2560 kfree_rcu(psf, rcu); 2561 } 2562 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2563 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2564 psf; 2565 psf = nextpsf) { 2566 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2567 kfree_rcu(psf, rcu); 2568 } 2569 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2570 pmc->mca_sfmode = MCAST_EXCLUDE; 2571 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2572 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2573 } 2574 2575 /* called with mc_lock */ 2576 static void igmp6_join_group(struct ifmcaddr6 *ma) 2577 { 2578 unsigned long delay; 2579 2580 if (ma->mca_flags & MAF_NOREPORT) 2581 return; 2582 2583 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2584 2585 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2586 2587 if (cancel_delayed_work(&ma->mca_work)) { 2588 refcount_dec(&ma->mca_refcnt); 2589 delay = ma->mca_work.timer.expires - jiffies; 2590 } 2591 2592 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2593 refcount_inc(&ma->mca_refcnt); 2594 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2595 } 2596 2597 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2598 struct inet6_dev *idev) 2599 { 2600 struct ip6_sf_socklist *psl; 2601 int err; 2602 2603 psl = rtnl_dereference(iml->sflist); 2604 2605 if (idev) 2606 mutex_lock(&idev->mc_lock); 2607 2608 if (!psl) { 2609 /* any-source empty exclude case */ 2610 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2611 } else { 2612 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2613 psl->sl_count, psl->sl_addr, 0); 2614 RCU_INIT_POINTER(iml->sflist, NULL); 2615 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2616 kfree_rcu(psl, rcu); 2617 } 2618 2619 if (idev) 2620 mutex_unlock(&idev->mc_lock); 2621 2622 return err; 2623 } 2624 2625 /* called with mc_lock */ 2626 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2627 { 2628 if (mld_in_v1_mode(ma->idev)) { 2629 if (ma->mca_flags & MAF_LAST_REPORTER) { 2630 igmp6_send(&ma->mca_addr, ma->idev->dev, 2631 ICMPV6_MGM_REDUCTION); 2632 } 2633 } else { 2634 mld_add_delrec(ma->idev, ma); 2635 mld_ifc_event(ma->idev); 2636 } 2637 } 2638 2639 static void mld_gq_work(struct work_struct *work) 2640 { 2641 struct inet6_dev *idev = container_of(to_delayed_work(work), 2642 struct inet6_dev, 2643 mc_gq_work); 2644 2645 mutex_lock(&idev->mc_lock); 2646 mld_send_report(idev, NULL); 2647 idev->mc_gq_running = 0; 2648 mutex_unlock(&idev->mc_lock); 2649 2650 in6_dev_put(idev); 2651 } 2652 2653 static void mld_ifc_work(struct work_struct *work) 2654 { 2655 struct inet6_dev *idev = container_of(to_delayed_work(work), 2656 struct inet6_dev, 2657 mc_ifc_work); 2658 2659 mutex_lock(&idev->mc_lock); 2660 mld_send_cr(idev); 2661 2662 if (idev->mc_ifc_count) { 2663 idev->mc_ifc_count--; 2664 if (idev->mc_ifc_count) 2665 mld_ifc_start_work(idev, 2666 unsolicited_report_interval(idev)); 2667 } 2668 mutex_unlock(&idev->mc_lock); 2669 in6_dev_put(idev); 2670 } 2671 2672 /* called with mc_lock */ 2673 static void mld_ifc_event(struct inet6_dev *idev) 2674 { 2675 if (mld_in_v1_mode(idev)) 2676 return; 2677 2678 idev->mc_ifc_count = idev->mc_qrv; 2679 mld_ifc_start_work(idev, 1); 2680 } 2681 2682 static void mld_mca_work(struct work_struct *work) 2683 { 2684 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2685 struct ifmcaddr6, mca_work); 2686 2687 mutex_lock(&ma->idev->mc_lock); 2688 if (mld_in_v1_mode(ma->idev)) 2689 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2690 else 2691 mld_send_report(ma->idev, ma); 2692 ma->mca_flags |= MAF_LAST_REPORTER; 2693 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2694 mutex_unlock(&ma->idev->mc_lock); 2695 2696 ma_put(ma); 2697 } 2698 2699 /* Device changing type */ 2700 2701 void ipv6_mc_unmap(struct inet6_dev *idev) 2702 { 2703 struct ifmcaddr6 *i; 2704 2705 /* Install multicast list, except for all-nodes (already installed) */ 2706 2707 mutex_lock(&idev->mc_lock); 2708 for_each_mc_mclock(idev, i) 2709 igmp6_group_dropped(i); 2710 mutex_unlock(&idev->mc_lock); 2711 } 2712 2713 void ipv6_mc_remap(struct inet6_dev *idev) 2714 { 2715 ipv6_mc_up(idev); 2716 } 2717 2718 /* Device going down */ 2719 void ipv6_mc_down(struct inet6_dev *idev) 2720 { 2721 struct ifmcaddr6 *i; 2722 2723 mutex_lock(&idev->mc_lock); 2724 /* Withdraw multicast list */ 2725 for_each_mc_mclock(idev, i) 2726 igmp6_group_dropped(i); 2727 mutex_unlock(&idev->mc_lock); 2728 2729 /* Should stop work after group drop. or we will 2730 * start work again in mld_ifc_event() 2731 */ 2732 synchronize_net(); 2733 mld_query_stop_work(idev); 2734 mld_report_stop_work(idev); 2735 mld_ifc_stop_work(idev); 2736 mld_gq_stop_work(idev); 2737 mld_dad_stop_work(idev); 2738 } 2739 2740 static void ipv6_mc_reset(struct inet6_dev *idev) 2741 { 2742 idev->mc_qrv = sysctl_mld_qrv; 2743 idev->mc_qi = MLD_QI_DEFAULT; 2744 idev->mc_qri = MLD_QRI_DEFAULT; 2745 idev->mc_v1_seen = 0; 2746 idev->mc_maxdelay = unsolicited_report_interval(idev); 2747 } 2748 2749 /* Device going up */ 2750 2751 void ipv6_mc_up(struct inet6_dev *idev) 2752 { 2753 struct ifmcaddr6 *i; 2754 2755 /* Install multicast list, except for all-nodes (already installed) */ 2756 2757 ipv6_mc_reset(idev); 2758 mutex_lock(&idev->mc_lock); 2759 for_each_mc_mclock(idev, i) { 2760 mld_del_delrec(idev, i); 2761 igmp6_group_added(i); 2762 } 2763 mutex_unlock(&idev->mc_lock); 2764 } 2765 2766 /* IPv6 device initialization. */ 2767 2768 void ipv6_mc_init_dev(struct inet6_dev *idev) 2769 { 2770 idev->mc_gq_running = 0; 2771 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2772 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2773 idev->mc_ifc_count = 0; 2774 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2775 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2776 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2777 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2778 skb_queue_head_init(&idev->mc_query_queue); 2779 skb_queue_head_init(&idev->mc_report_queue); 2780 spin_lock_init(&idev->mc_query_lock); 2781 spin_lock_init(&idev->mc_report_lock); 2782 mutex_init(&idev->mc_lock); 2783 ipv6_mc_reset(idev); 2784 } 2785 2786 /* 2787 * Device is about to be destroyed: clean up. 2788 */ 2789 2790 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2791 { 2792 struct ifmcaddr6 *i; 2793 2794 /* Deactivate works */ 2795 ipv6_mc_down(idev); 2796 mutex_lock(&idev->mc_lock); 2797 mld_clear_delrec(idev); 2798 mutex_unlock(&idev->mc_lock); 2799 mld_clear_query(idev); 2800 mld_clear_report(idev); 2801 2802 /* Delete all-nodes address. */ 2803 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2804 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2805 * fail. 2806 */ 2807 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2808 2809 if (idev->cnf.forwarding) 2810 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2811 2812 mutex_lock(&idev->mc_lock); 2813 while ((i = mc_dereference(idev->mc_list, idev))) { 2814 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2815 2816 ip6_mc_clear_src(i); 2817 ma_put(i); 2818 } 2819 mutex_unlock(&idev->mc_lock); 2820 } 2821 2822 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2823 { 2824 struct ifmcaddr6 *pmc; 2825 2826 ASSERT_RTNL(); 2827 2828 mutex_lock(&idev->mc_lock); 2829 if (mld_in_v1_mode(idev)) { 2830 for_each_mc_mclock(idev, pmc) 2831 igmp6_join_group(pmc); 2832 } else { 2833 mld_send_report(idev, NULL); 2834 } 2835 mutex_unlock(&idev->mc_lock); 2836 } 2837 2838 static int ipv6_mc_netdev_event(struct notifier_block *this, 2839 unsigned long event, 2840 void *ptr) 2841 { 2842 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2843 struct inet6_dev *idev = __in6_dev_get(dev); 2844 2845 switch (event) { 2846 case NETDEV_RESEND_IGMP: 2847 if (idev) 2848 ipv6_mc_rejoin_groups(idev); 2849 break; 2850 default: 2851 break; 2852 } 2853 2854 return NOTIFY_DONE; 2855 } 2856 2857 static struct notifier_block igmp6_netdev_notifier = { 2858 .notifier_call = ipv6_mc_netdev_event, 2859 }; 2860 2861 #ifdef CONFIG_PROC_FS 2862 struct igmp6_mc_iter_state { 2863 struct seq_net_private p; 2864 struct net_device *dev; 2865 struct inet6_dev *idev; 2866 }; 2867 2868 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2869 2870 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2871 { 2872 struct ifmcaddr6 *im = NULL; 2873 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2874 struct net *net = seq_file_net(seq); 2875 2876 state->idev = NULL; 2877 for_each_netdev_rcu(net, state->dev) { 2878 struct inet6_dev *idev; 2879 idev = __in6_dev_get(state->dev); 2880 if (!idev) 2881 continue; 2882 2883 im = rcu_dereference(idev->mc_list); 2884 if (im) { 2885 state->idev = idev; 2886 break; 2887 } 2888 } 2889 return im; 2890 } 2891 2892 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2893 { 2894 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2895 2896 im = rcu_dereference(im->next); 2897 while (!im) { 2898 state->dev = next_net_device_rcu(state->dev); 2899 if (!state->dev) { 2900 state->idev = NULL; 2901 break; 2902 } 2903 state->idev = __in6_dev_get(state->dev); 2904 if (!state->idev) 2905 continue; 2906 im = rcu_dereference(state->idev->mc_list); 2907 } 2908 return im; 2909 } 2910 2911 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2912 { 2913 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2914 if (im) 2915 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2916 --pos; 2917 return pos ? NULL : im; 2918 } 2919 2920 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2921 __acquires(RCU) 2922 { 2923 rcu_read_lock(); 2924 return igmp6_mc_get_idx(seq, *pos); 2925 } 2926 2927 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2928 { 2929 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2930 2931 ++*pos; 2932 return im; 2933 } 2934 2935 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2936 __releases(RCU) 2937 { 2938 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2939 2940 if (likely(state->idev)) 2941 state->idev = NULL; 2942 state->dev = NULL; 2943 rcu_read_unlock(); 2944 } 2945 2946 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2947 { 2948 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2949 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2950 2951 seq_printf(seq, 2952 "%-4d %-15s %pi6 %5d %08X %ld\n", 2953 state->dev->ifindex, state->dev->name, 2954 &im->mca_addr, 2955 im->mca_users, im->mca_flags, 2956 (im->mca_flags & MAF_TIMER_RUNNING) ? 2957 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2958 return 0; 2959 } 2960 2961 static const struct seq_operations igmp6_mc_seq_ops = { 2962 .start = igmp6_mc_seq_start, 2963 .next = igmp6_mc_seq_next, 2964 .stop = igmp6_mc_seq_stop, 2965 .show = igmp6_mc_seq_show, 2966 }; 2967 2968 struct igmp6_mcf_iter_state { 2969 struct seq_net_private p; 2970 struct net_device *dev; 2971 struct inet6_dev *idev; 2972 struct ifmcaddr6 *im; 2973 }; 2974 2975 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2976 2977 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2978 { 2979 struct ip6_sf_list *psf = NULL; 2980 struct ifmcaddr6 *im = NULL; 2981 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2982 struct net *net = seq_file_net(seq); 2983 2984 state->idev = NULL; 2985 state->im = NULL; 2986 for_each_netdev_rcu(net, state->dev) { 2987 struct inet6_dev *idev; 2988 idev = __in6_dev_get(state->dev); 2989 if (unlikely(idev == NULL)) 2990 continue; 2991 2992 im = rcu_dereference(idev->mc_list); 2993 if (likely(im)) { 2994 psf = rcu_dereference(im->mca_sources); 2995 if (likely(psf)) { 2996 state->im = im; 2997 state->idev = idev; 2998 break; 2999 } 3000 } 3001 } 3002 return psf; 3003 } 3004 3005 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3006 { 3007 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3008 3009 psf = rcu_dereference(psf->sf_next); 3010 while (!psf) { 3011 state->im = rcu_dereference(state->im->next); 3012 while (!state->im) { 3013 state->dev = next_net_device_rcu(state->dev); 3014 if (!state->dev) { 3015 state->idev = NULL; 3016 goto out; 3017 } 3018 state->idev = __in6_dev_get(state->dev); 3019 if (!state->idev) 3020 continue; 3021 state->im = rcu_dereference(state->idev->mc_list); 3022 } 3023 if (!state->im) 3024 break; 3025 psf = rcu_dereference(state->im->mca_sources); 3026 } 3027 out: 3028 return psf; 3029 } 3030 3031 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3032 { 3033 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3034 if (psf) 3035 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3036 --pos; 3037 return pos ? NULL : psf; 3038 } 3039 3040 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3041 __acquires(RCU) 3042 { 3043 rcu_read_lock(); 3044 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3045 } 3046 3047 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3048 { 3049 struct ip6_sf_list *psf; 3050 if (v == SEQ_START_TOKEN) 3051 psf = igmp6_mcf_get_first(seq); 3052 else 3053 psf = igmp6_mcf_get_next(seq, v); 3054 ++*pos; 3055 return psf; 3056 } 3057 3058 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3059 __releases(RCU) 3060 { 3061 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3062 3063 if (likely(state->im)) 3064 state->im = NULL; 3065 if (likely(state->idev)) 3066 state->idev = NULL; 3067 3068 state->dev = NULL; 3069 rcu_read_unlock(); 3070 } 3071 3072 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3073 { 3074 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3075 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3076 3077 if (v == SEQ_START_TOKEN) { 3078 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3079 } else { 3080 seq_printf(seq, 3081 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3082 state->dev->ifindex, state->dev->name, 3083 &state->im->mca_addr, 3084 &psf->sf_addr, 3085 psf->sf_count[MCAST_INCLUDE], 3086 psf->sf_count[MCAST_EXCLUDE]); 3087 } 3088 return 0; 3089 } 3090 3091 static const struct seq_operations igmp6_mcf_seq_ops = { 3092 .start = igmp6_mcf_seq_start, 3093 .next = igmp6_mcf_seq_next, 3094 .stop = igmp6_mcf_seq_stop, 3095 .show = igmp6_mcf_seq_show, 3096 }; 3097 3098 static int __net_init igmp6_proc_init(struct net *net) 3099 { 3100 int err; 3101 3102 err = -ENOMEM; 3103 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3104 sizeof(struct igmp6_mc_iter_state))) 3105 goto out; 3106 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3107 &igmp6_mcf_seq_ops, 3108 sizeof(struct igmp6_mcf_iter_state))) 3109 goto out_proc_net_igmp6; 3110 3111 err = 0; 3112 out: 3113 return err; 3114 3115 out_proc_net_igmp6: 3116 remove_proc_entry("igmp6", net->proc_net); 3117 goto out; 3118 } 3119 3120 static void __net_exit igmp6_proc_exit(struct net *net) 3121 { 3122 remove_proc_entry("mcfilter6", net->proc_net); 3123 remove_proc_entry("igmp6", net->proc_net); 3124 } 3125 #else 3126 static inline int igmp6_proc_init(struct net *net) 3127 { 3128 return 0; 3129 } 3130 static inline void igmp6_proc_exit(struct net *net) 3131 { 3132 } 3133 #endif 3134 3135 static int __net_init igmp6_net_init(struct net *net) 3136 { 3137 int err; 3138 3139 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3140 SOCK_RAW, IPPROTO_ICMPV6, net); 3141 if (err < 0) { 3142 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3143 err); 3144 goto out; 3145 } 3146 3147 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3148 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3149 3150 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3151 SOCK_RAW, IPPROTO_ICMPV6, net); 3152 if (err < 0) { 3153 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3154 err); 3155 goto out_sock_create; 3156 } 3157 3158 err = igmp6_proc_init(net); 3159 if (err) 3160 goto out_sock_create_autojoin; 3161 3162 return 0; 3163 3164 out_sock_create_autojoin: 3165 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3166 out_sock_create: 3167 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3168 out: 3169 return err; 3170 } 3171 3172 static void __net_exit igmp6_net_exit(struct net *net) 3173 { 3174 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3175 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3176 igmp6_proc_exit(net); 3177 } 3178 3179 static struct pernet_operations igmp6_net_ops = { 3180 .init = igmp6_net_init, 3181 .exit = igmp6_net_exit, 3182 }; 3183 3184 int __init igmp6_init(void) 3185 { 3186 int err; 3187 3188 err = register_pernet_subsys(&igmp6_net_ops); 3189 if (err) 3190 return err; 3191 3192 mld_wq = create_workqueue("mld"); 3193 if (!mld_wq) { 3194 unregister_pernet_subsys(&igmp6_net_ops); 3195 return -ENOMEM; 3196 } 3197 3198 return err; 3199 } 3200 3201 int __init igmp6_late_init(void) 3202 { 3203 return register_netdevice_notifier(&igmp6_netdev_notifier); 3204 } 3205 3206 void igmp6_cleanup(void) 3207 { 3208 unregister_pernet_subsys(&igmp6_net_ops); 3209 destroy_workqueue(mld_wq); 3210 } 3211 3212 void igmp6_late_cleanup(void) 3213 { 3214 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3215 } 3216