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, IP6_SFLSIZE(count), GFP_KERNEL); 451 if (!newpsl) { 452 err = -ENOBUFS; 453 goto done; 454 } 455 newpsl->sl_max = count; 456 newpsl->sl_count = count - IP6_SFBLOCK; 457 if (psl) { 458 for (i = 0; i < psl->sl_count; i++) 459 newpsl->sl_addr[i] = psl->sl_addr[i]; 460 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 461 kfree_rcu(psl, rcu); 462 } 463 psl = newpsl; 464 rcu_assign_pointer(pmc->sflist, psl); 465 } 466 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 467 for (i = 0; i < psl->sl_count; i++) { 468 rv = !ipv6_addr_equal(&psl->sl_addr[i], source); 469 if (rv == 0) /* There is an error in the address. */ 470 goto done; 471 } 472 for (j = psl->sl_count-1; j >= i; j--) 473 psl->sl_addr[j+1] = psl->sl_addr[j]; 474 psl->sl_addr[i] = *source; 475 psl->sl_count++; 476 err = 0; 477 /* update the interface list */ 478 ip6_mc_add_src(idev, group, omode, 1, source, 1); 479 done: 480 mutex_unlock(&idev->mc_lock); 481 if (leavegroup) 482 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 483 return err; 484 } 485 486 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, 487 struct sockaddr_storage *list) 488 { 489 const struct in6_addr *group; 490 struct ipv6_mc_socklist *pmc; 491 struct inet6_dev *idev; 492 struct ipv6_pinfo *inet6 = inet6_sk(sk); 493 struct ip6_sf_socklist *newpsl, *psl; 494 struct net *net = sock_net(sk); 495 int leavegroup = 0; 496 int i, err; 497 498 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 499 500 if (!ipv6_addr_is_multicast(group)) 501 return -EINVAL; 502 if (gsf->gf_fmode != MCAST_INCLUDE && 503 gsf->gf_fmode != MCAST_EXCLUDE) 504 return -EINVAL; 505 506 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface); 507 if (!idev) 508 return -ENODEV; 509 510 err = 0; 511 512 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 513 leavegroup = 1; 514 goto done; 515 } 516 517 for_each_pmc_socklock(inet6, sk, pmc) { 518 if (pmc->ifindex != gsf->gf_interface) 519 continue; 520 if (ipv6_addr_equal(&pmc->addr, group)) 521 break; 522 } 523 if (!pmc) { /* must have a prior join */ 524 err = -EINVAL; 525 goto done; 526 } 527 if (gsf->gf_numsrc) { 528 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 529 GFP_KERNEL); 530 if (!newpsl) { 531 err = -ENOBUFS; 532 goto done; 533 } 534 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 535 for (i = 0; i < newpsl->sl_count; ++i, ++list) { 536 struct sockaddr_in6 *psin6; 537 538 psin6 = (struct sockaddr_in6 *)list; 539 newpsl->sl_addr[i] = psin6->sin6_addr; 540 } 541 mutex_lock(&idev->mc_lock); 542 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 543 newpsl->sl_count, newpsl->sl_addr, 0); 544 if (err) { 545 mutex_unlock(&idev->mc_lock); 546 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 547 goto done; 548 } 549 mutex_unlock(&idev->mc_lock); 550 } else { 551 newpsl = NULL; 552 mutex_lock(&idev->mc_lock); 553 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 554 mutex_unlock(&idev->mc_lock); 555 } 556 557 mutex_lock(&idev->mc_lock); 558 psl = sock_dereference(pmc->sflist, sk); 559 if (psl) { 560 ip6_mc_del_src(idev, group, pmc->sfmode, 561 psl->sl_count, psl->sl_addr, 0); 562 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 563 kfree_rcu(psl, rcu); 564 } else { 565 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 566 } 567 mutex_unlock(&idev->mc_lock); 568 rcu_assign_pointer(pmc->sflist, newpsl); 569 pmc->sfmode = gsf->gf_fmode; 570 err = 0; 571 done: 572 if (leavegroup) 573 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 574 return err; 575 } 576 577 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 578 struct sockaddr_storage __user *p) 579 { 580 struct ipv6_pinfo *inet6 = inet6_sk(sk); 581 const struct in6_addr *group; 582 struct ipv6_mc_socklist *pmc; 583 struct ip6_sf_socklist *psl; 584 int i, count, copycount; 585 586 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 587 588 if (!ipv6_addr_is_multicast(group)) 589 return -EINVAL; 590 591 /* changes to the ipv6_mc_list require the socket lock and 592 * rtnl lock. We have the socket lock, so reading the list is safe. 593 */ 594 595 for_each_pmc_socklock(inet6, sk, pmc) { 596 if (pmc->ifindex != gsf->gf_interface) 597 continue; 598 if (ipv6_addr_equal(group, &pmc->addr)) 599 break; 600 } 601 if (!pmc) /* must have a prior join */ 602 return -EADDRNOTAVAIL; 603 604 gsf->gf_fmode = pmc->sfmode; 605 psl = sock_dereference(pmc->sflist, sk); 606 count = psl ? psl->sl_count : 0; 607 608 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 609 gsf->gf_numsrc = count; 610 611 for (i = 0; i < copycount; i++, p++) { 612 struct sockaddr_in6 *psin6; 613 struct sockaddr_storage ss; 614 615 psin6 = (struct sockaddr_in6 *)&ss; 616 memset(&ss, 0, sizeof(ss)); 617 psin6->sin6_family = AF_INET6; 618 psin6->sin6_addr = psl->sl_addr[i]; 619 if (copy_to_user(p, &ss, sizeof(ss))) 620 return -EFAULT; 621 } 622 return 0; 623 } 624 625 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 626 const struct in6_addr *src_addr) 627 { 628 struct ipv6_pinfo *np = inet6_sk(sk); 629 struct ipv6_mc_socklist *mc; 630 struct ip6_sf_socklist *psl; 631 bool rv = true; 632 633 rcu_read_lock(); 634 for_each_pmc_rcu(np, mc) { 635 if (ipv6_addr_equal(&mc->addr, mc_addr)) 636 break; 637 } 638 if (!mc) { 639 rcu_read_unlock(); 640 return np->mc_all; 641 } 642 psl = rcu_dereference(mc->sflist); 643 if (!psl) { 644 rv = mc->sfmode == MCAST_EXCLUDE; 645 } else { 646 int i; 647 648 for (i = 0; i < psl->sl_count; i++) { 649 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 650 break; 651 } 652 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 653 rv = false; 654 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 655 rv = false; 656 } 657 rcu_read_unlock(); 658 659 return rv; 660 } 661 662 /* called with mc_lock */ 663 static void igmp6_group_added(struct ifmcaddr6 *mc) 664 { 665 struct net_device *dev = mc->idev->dev; 666 char buf[MAX_ADDR_LEN]; 667 668 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 669 IPV6_ADDR_SCOPE_LINKLOCAL) 670 return; 671 672 if (!(mc->mca_flags&MAF_LOADED)) { 673 mc->mca_flags |= MAF_LOADED; 674 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 675 dev_mc_add(dev, buf); 676 } 677 678 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 679 return; 680 681 if (mld_in_v1_mode(mc->idev)) { 682 igmp6_join_group(mc); 683 return; 684 } 685 /* else v2 */ 686 687 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we 688 * should not send filter-mode change record as the mode 689 * should be from IN() to IN(A). 690 */ 691 if (mc->mca_sfmode == MCAST_EXCLUDE) 692 mc->mca_crcount = mc->idev->mc_qrv; 693 694 mld_ifc_event(mc->idev); 695 } 696 697 /* called with mc_lock */ 698 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 699 { 700 struct net_device *dev = mc->idev->dev; 701 char buf[MAX_ADDR_LEN]; 702 703 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < 704 IPV6_ADDR_SCOPE_LINKLOCAL) 705 return; 706 707 if (mc->mca_flags&MAF_LOADED) { 708 mc->mca_flags &= ~MAF_LOADED; 709 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 710 dev_mc_del(dev, buf); 711 } 712 713 if (mc->mca_flags & MAF_NOREPORT) 714 return; 715 716 if (!mc->idev->dead) 717 igmp6_leave_group(mc); 718 719 if (cancel_delayed_work(&mc->mca_work)) 720 refcount_dec(&mc->mca_refcnt); 721 } 722 723 /* 724 * deleted ifmcaddr6 manipulation 725 * called with mc_lock 726 */ 727 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 728 { 729 struct ifmcaddr6 *pmc; 730 731 /* this is an "ifmcaddr6" for convenience; only the fields below 732 * are actually used. In particular, the refcnt and users are not 733 * used for management of the delete list. Using the same structure 734 * for deleted items allows change reports to use common code with 735 * non-deleted or query-response MCA's. 736 */ 737 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 738 if (!pmc) 739 return; 740 741 pmc->idev = im->idev; 742 in6_dev_hold(idev); 743 pmc->mca_addr = im->mca_addr; 744 pmc->mca_crcount = idev->mc_qrv; 745 pmc->mca_sfmode = im->mca_sfmode; 746 if (pmc->mca_sfmode == MCAST_INCLUDE) { 747 struct ip6_sf_list *psf; 748 749 rcu_assign_pointer(pmc->mca_tomb, 750 mc_dereference(im->mca_tomb, idev)); 751 rcu_assign_pointer(pmc->mca_sources, 752 mc_dereference(im->mca_sources, idev)); 753 RCU_INIT_POINTER(im->mca_tomb, NULL); 754 RCU_INIT_POINTER(im->mca_sources, NULL); 755 756 for_each_psf_mclock(pmc, psf) 757 psf->sf_crcount = pmc->mca_crcount; 758 } 759 760 rcu_assign_pointer(pmc->next, idev->mc_tomb); 761 rcu_assign_pointer(idev->mc_tomb, pmc); 762 } 763 764 /* called with mc_lock */ 765 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 766 { 767 struct ip6_sf_list *psf, *sources, *tomb; 768 struct in6_addr *pmca = &im->mca_addr; 769 struct ifmcaddr6 *pmc, *pmc_prev; 770 771 pmc_prev = NULL; 772 for_each_mc_tomb(idev, pmc) { 773 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 774 break; 775 pmc_prev = pmc; 776 } 777 if (pmc) { 778 if (pmc_prev) 779 rcu_assign_pointer(pmc_prev->next, pmc->next); 780 else 781 rcu_assign_pointer(idev->mc_tomb, pmc->next); 782 } 783 784 if (pmc) { 785 im->idev = pmc->idev; 786 if (im->mca_sfmode == MCAST_INCLUDE) { 787 tomb = rcu_replace_pointer(im->mca_tomb, 788 mc_dereference(pmc->mca_tomb, pmc->idev), 789 lockdep_is_held(&im->idev->mc_lock)); 790 rcu_assign_pointer(pmc->mca_tomb, tomb); 791 792 sources = rcu_replace_pointer(im->mca_sources, 793 mc_dereference(pmc->mca_sources, pmc->idev), 794 lockdep_is_held(&im->idev->mc_lock)); 795 rcu_assign_pointer(pmc->mca_sources, sources); 796 for_each_psf_mclock(im, psf) 797 psf->sf_crcount = idev->mc_qrv; 798 } else { 799 im->mca_crcount = idev->mc_qrv; 800 } 801 in6_dev_put(pmc->idev); 802 ip6_mc_clear_src(pmc); 803 kfree_rcu(pmc, rcu); 804 } 805 } 806 807 /* called with mc_lock */ 808 static void mld_clear_delrec(struct inet6_dev *idev) 809 { 810 struct ifmcaddr6 *pmc, *nextpmc; 811 812 pmc = mc_dereference(idev->mc_tomb, idev); 813 RCU_INIT_POINTER(idev->mc_tomb, NULL); 814 815 for (; pmc; pmc = nextpmc) { 816 nextpmc = mc_dereference(pmc->next, idev); 817 ip6_mc_clear_src(pmc); 818 in6_dev_put(pmc->idev); 819 kfree_rcu(pmc, rcu); 820 } 821 822 /* clear dead sources, too */ 823 for_each_mc_mclock(idev, pmc) { 824 struct ip6_sf_list *psf, *psf_next; 825 826 psf = mc_dereference(pmc->mca_tomb, idev); 827 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 828 for (; psf; psf = psf_next) { 829 psf_next = mc_dereference(psf->sf_next, idev); 830 kfree_rcu(psf, rcu); 831 } 832 } 833 } 834 835 static void mld_clear_query(struct inet6_dev *idev) 836 { 837 struct sk_buff *skb; 838 839 spin_lock_bh(&idev->mc_query_lock); 840 while ((skb = __skb_dequeue(&idev->mc_query_queue))) 841 kfree_skb(skb); 842 spin_unlock_bh(&idev->mc_query_lock); 843 } 844 845 static void mld_clear_report(struct inet6_dev *idev) 846 { 847 struct sk_buff *skb; 848 849 spin_lock_bh(&idev->mc_report_lock); 850 while ((skb = __skb_dequeue(&idev->mc_report_queue))) 851 kfree_skb(skb); 852 spin_unlock_bh(&idev->mc_report_lock); 853 } 854 855 static void mca_get(struct ifmcaddr6 *mc) 856 { 857 refcount_inc(&mc->mca_refcnt); 858 } 859 860 static void ma_put(struct ifmcaddr6 *mc) 861 { 862 if (refcount_dec_and_test(&mc->mca_refcnt)) { 863 in6_dev_put(mc->idev); 864 kfree_rcu(mc, rcu); 865 } 866 } 867 868 /* called with mc_lock */ 869 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, 870 const struct in6_addr *addr, 871 unsigned int mode) 872 { 873 struct ifmcaddr6 *mc; 874 875 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 876 if (!mc) 877 return NULL; 878 879 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); 880 881 mc->mca_addr = *addr; 882 mc->idev = idev; /* reference taken by caller */ 883 mc->mca_users = 1; 884 /* mca_stamp should be updated upon changes */ 885 mc->mca_cstamp = mc->mca_tstamp = jiffies; 886 refcount_set(&mc->mca_refcnt, 1); 887 888 mc->mca_sfmode = mode; 889 mc->mca_sfcount[mode] = 1; 890 891 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 892 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 893 mc->mca_flags |= MAF_NOREPORT; 894 895 return mc; 896 } 897 898 /* 899 * device multicast group inc (add if not found) 900 */ 901 static int __ipv6_dev_mc_inc(struct net_device *dev, 902 const struct in6_addr *addr, unsigned int mode) 903 { 904 struct ifmcaddr6 *mc; 905 struct inet6_dev *idev; 906 907 ASSERT_RTNL(); 908 909 /* we need to take a reference on idev */ 910 idev = in6_dev_get(dev); 911 912 if (!idev) 913 return -EINVAL; 914 915 if (idev->dead) { 916 in6_dev_put(idev); 917 return -ENODEV; 918 } 919 920 mutex_lock(&idev->mc_lock); 921 for_each_mc_mclock(idev, mc) { 922 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 923 mc->mca_users++; 924 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); 925 mutex_unlock(&idev->mc_lock); 926 in6_dev_put(idev); 927 return 0; 928 } 929 } 930 931 mc = mca_alloc(idev, addr, mode); 932 if (!mc) { 933 mutex_unlock(&idev->mc_lock); 934 in6_dev_put(idev); 935 return -ENOMEM; 936 } 937 938 rcu_assign_pointer(mc->next, idev->mc_list); 939 rcu_assign_pointer(idev->mc_list, mc); 940 941 mca_get(mc); 942 943 mld_del_delrec(idev, mc); 944 igmp6_group_added(mc); 945 mutex_unlock(&idev->mc_lock); 946 ma_put(mc); 947 return 0; 948 } 949 950 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 951 { 952 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); 953 } 954 EXPORT_SYMBOL(ipv6_dev_mc_inc); 955 956 /* 957 * device multicast group del 958 */ 959 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 960 { 961 struct ifmcaddr6 *ma, __rcu **map; 962 963 ASSERT_RTNL(); 964 965 mutex_lock(&idev->mc_lock); 966 for (map = &idev->mc_list; 967 (ma = mc_dereference(*map, idev)); 968 map = &ma->next) { 969 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 970 if (--ma->mca_users == 0) { 971 *map = ma->next; 972 973 igmp6_group_dropped(ma); 974 ip6_mc_clear_src(ma); 975 mutex_unlock(&idev->mc_lock); 976 977 ma_put(ma); 978 return 0; 979 } 980 mutex_unlock(&idev->mc_lock); 981 return 0; 982 } 983 } 984 985 mutex_unlock(&idev->mc_lock); 986 return -ENOENT; 987 } 988 989 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 990 { 991 struct inet6_dev *idev; 992 int err; 993 994 ASSERT_RTNL(); 995 996 idev = __in6_dev_get(dev); 997 if (!idev) 998 err = -ENODEV; 999 else 1000 err = __ipv6_dev_mc_dec(idev, addr); 1001 1002 return err; 1003 } 1004 EXPORT_SYMBOL(ipv6_dev_mc_dec); 1005 1006 /* 1007 * check if the interface/address pair is valid 1008 */ 1009 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1010 const struct in6_addr *src_addr) 1011 { 1012 struct inet6_dev *idev; 1013 struct ifmcaddr6 *mc; 1014 bool rv = false; 1015 1016 rcu_read_lock(); 1017 idev = __in6_dev_get(dev); 1018 if (idev) { 1019 for_each_mc_rcu(idev, mc) { 1020 if (ipv6_addr_equal(&mc->mca_addr, group)) 1021 break; 1022 } 1023 if (mc) { 1024 if (src_addr && !ipv6_addr_any(src_addr)) { 1025 struct ip6_sf_list *psf; 1026 1027 for_each_psf_rcu(mc, psf) { 1028 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1029 break; 1030 } 1031 if (psf) 1032 rv = psf->sf_count[MCAST_INCLUDE] || 1033 psf->sf_count[MCAST_EXCLUDE] != 1034 mc->mca_sfcount[MCAST_EXCLUDE]; 1035 else 1036 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; 1037 } else 1038 rv = true; /* don't filter unspecified source */ 1039 } 1040 } 1041 rcu_read_unlock(); 1042 return rv; 1043 } 1044 1045 /* called with mc_lock */ 1046 static void mld_gq_start_work(struct inet6_dev *idev) 1047 { 1048 unsigned long tv = prandom_u32() % idev->mc_maxdelay; 1049 1050 idev->mc_gq_running = 1; 1051 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2)) 1052 in6_dev_hold(idev); 1053 } 1054 1055 /* called with mc_lock */ 1056 static void mld_gq_stop_work(struct inet6_dev *idev) 1057 { 1058 idev->mc_gq_running = 0; 1059 if (cancel_delayed_work(&idev->mc_gq_work)) 1060 __in6_dev_put(idev); 1061 } 1062 1063 /* called with mc_lock */ 1064 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) 1065 { 1066 unsigned long tv = prandom_u32() % delay; 1067 1068 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2)) 1069 in6_dev_hold(idev); 1070 } 1071 1072 /* called with mc_lock */ 1073 static void mld_ifc_stop_work(struct inet6_dev *idev) 1074 { 1075 idev->mc_ifc_count = 0; 1076 if (cancel_delayed_work(&idev->mc_ifc_work)) 1077 __in6_dev_put(idev); 1078 } 1079 1080 /* called with mc_lock */ 1081 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) 1082 { 1083 unsigned long tv = prandom_u32() % delay; 1084 1085 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2)) 1086 in6_dev_hold(idev); 1087 } 1088 1089 static void mld_dad_stop_work(struct inet6_dev *idev) 1090 { 1091 if (cancel_delayed_work(&idev->mc_dad_work)) 1092 __in6_dev_put(idev); 1093 } 1094 1095 static void mld_query_stop_work(struct inet6_dev *idev) 1096 { 1097 spin_lock_bh(&idev->mc_query_lock); 1098 if (cancel_delayed_work(&idev->mc_query_work)) 1099 __in6_dev_put(idev); 1100 spin_unlock_bh(&idev->mc_query_lock); 1101 } 1102 1103 static void mld_report_stop_work(struct inet6_dev *idev) 1104 { 1105 if (cancel_delayed_work_sync(&idev->mc_report_work)) 1106 __in6_dev_put(idev); 1107 } 1108 1109 /* 1110 * IGMP handling (alias multicast ICMPv6 messages) 1111 * called with mc_lock 1112 */ 1113 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1114 { 1115 unsigned long delay = resptime; 1116 1117 /* Do not start work for these addresses */ 1118 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1119 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1120 return; 1121 1122 if (cancel_delayed_work(&ma->mca_work)) { 1123 refcount_dec(&ma->mca_refcnt); 1124 delay = ma->mca_work.timer.expires - jiffies; 1125 } 1126 1127 if (delay >= resptime) 1128 delay = prandom_u32() % resptime; 1129 1130 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 1131 refcount_inc(&ma->mca_refcnt); 1132 ma->mca_flags |= MAF_TIMER_RUNNING; 1133 } 1134 1135 /* mark EXCLUDE-mode sources 1136 * called with mc_lock 1137 */ 1138 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1139 const struct in6_addr *srcs) 1140 { 1141 struct ip6_sf_list *psf; 1142 int i, scount; 1143 1144 scount = 0; 1145 for_each_psf_mclock(pmc, psf) { 1146 if (scount == nsrcs) 1147 break; 1148 for (i = 0; i < nsrcs; i++) { 1149 /* skip inactive filters */ 1150 if (psf->sf_count[MCAST_INCLUDE] || 1151 pmc->mca_sfcount[MCAST_EXCLUDE] != 1152 psf->sf_count[MCAST_EXCLUDE]) 1153 break; 1154 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1155 scount++; 1156 break; 1157 } 1158 } 1159 } 1160 pmc->mca_flags &= ~MAF_GSQUERY; 1161 if (scount == nsrcs) /* all sources excluded */ 1162 return false; 1163 return true; 1164 } 1165 1166 /* called with mc_lock */ 1167 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1168 const struct in6_addr *srcs) 1169 { 1170 struct ip6_sf_list *psf; 1171 int i, scount; 1172 1173 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1174 return mld_xmarksources(pmc, nsrcs, srcs); 1175 1176 /* mark INCLUDE-mode sources */ 1177 1178 scount = 0; 1179 for_each_psf_mclock(pmc, psf) { 1180 if (scount == nsrcs) 1181 break; 1182 for (i = 0; i < nsrcs; i++) { 1183 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1184 psf->sf_gsresp = 1; 1185 scount++; 1186 break; 1187 } 1188 } 1189 } 1190 if (!scount) { 1191 pmc->mca_flags &= ~MAF_GSQUERY; 1192 return false; 1193 } 1194 pmc->mca_flags |= MAF_GSQUERY; 1195 return true; 1196 } 1197 1198 static int mld_force_mld_version(const struct inet6_dev *idev) 1199 { 1200 /* Normally, both are 0 here. If enforcement to a particular is 1201 * being used, individual device enforcement will have a lower 1202 * precedence over 'all' device (.../conf/all/force_mld_version). 1203 */ 1204 1205 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) 1206 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; 1207 else 1208 return idev->cnf.force_mld_version; 1209 } 1210 1211 static bool mld_in_v2_mode_only(const struct inet6_dev *idev) 1212 { 1213 return mld_force_mld_version(idev) == 2; 1214 } 1215 1216 static bool mld_in_v1_mode_only(const struct inet6_dev *idev) 1217 { 1218 return mld_force_mld_version(idev) == 1; 1219 } 1220 1221 static bool mld_in_v1_mode(const struct inet6_dev *idev) 1222 { 1223 if (mld_in_v2_mode_only(idev)) 1224 return false; 1225 if (mld_in_v1_mode_only(idev)) 1226 return true; 1227 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) 1228 return true; 1229 1230 return false; 1231 } 1232 1233 static void mld_set_v1_mode(struct inet6_dev *idev) 1234 { 1235 /* RFC3810, relevant sections: 1236 * - 9.1. Robustness Variable 1237 * - 9.2. Query Interval 1238 * - 9.3. Query Response Interval 1239 * - 9.12. Older Version Querier Present Timeout 1240 */ 1241 unsigned long switchback; 1242 1243 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; 1244 1245 idev->mc_v1_seen = jiffies + switchback; 1246 } 1247 1248 static void mld_update_qrv(struct inet6_dev *idev, 1249 const struct mld2_query *mlh2) 1250 { 1251 /* RFC3810, relevant sections: 1252 * - 5.1.8. QRV (Querier's Robustness Variable) 1253 * - 9.1. Robustness Variable 1254 */ 1255 1256 /* The value of the Robustness Variable MUST NOT be zero, 1257 * and SHOULD NOT be one. Catch this here if we ever run 1258 * into such a case in future. 1259 */ 1260 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); 1261 WARN_ON(idev->mc_qrv == 0); 1262 1263 if (mlh2->mld2q_qrv > 0) 1264 idev->mc_qrv = mlh2->mld2q_qrv; 1265 1266 if (unlikely(idev->mc_qrv < min_qrv)) { 1267 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", 1268 idev->mc_qrv, min_qrv); 1269 idev->mc_qrv = min_qrv; 1270 } 1271 } 1272 1273 static void mld_update_qi(struct inet6_dev *idev, 1274 const struct mld2_query *mlh2) 1275 { 1276 /* RFC3810, relevant sections: 1277 * - 5.1.9. QQIC (Querier's Query Interval Code) 1278 * - 9.2. Query Interval 1279 * - 9.12. Older Version Querier Present Timeout 1280 * (the [Query Interval] in the last Query received) 1281 */ 1282 unsigned long mc_qqi; 1283 1284 if (mlh2->mld2q_qqic < 128) { 1285 mc_qqi = mlh2->mld2q_qqic; 1286 } else { 1287 unsigned long mc_man, mc_exp; 1288 1289 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); 1290 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); 1291 1292 mc_qqi = (mc_man | 0x10) << (mc_exp + 3); 1293 } 1294 1295 idev->mc_qi = mc_qqi * HZ; 1296 } 1297 1298 static void mld_update_qri(struct inet6_dev *idev, 1299 const struct mld2_query *mlh2) 1300 { 1301 /* RFC3810, relevant sections: 1302 * - 5.1.3. Maximum Response Code 1303 * - 9.3. Query Response Interval 1304 */ 1305 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); 1306 } 1307 1308 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, 1309 unsigned long *max_delay, bool v1_query) 1310 { 1311 unsigned long mldv1_md; 1312 1313 /* Ignore v1 queries */ 1314 if (mld_in_v2_mode_only(idev)) 1315 return -EINVAL; 1316 1317 mldv1_md = ntohs(mld->mld_maxdelay); 1318 1319 /* When in MLDv1 fallback and a MLDv2 router start-up being 1320 * unaware of current MLDv1 operation, the MRC == MRD mapping 1321 * only works when the exponential algorithm is not being 1322 * used (as MLDv1 is unaware of such things). 1323 * 1324 * According to the RFC author, the MLDv2 implementations 1325 * he's aware of all use a MRC < 32768 on start up queries. 1326 * 1327 * Thus, should we *ever* encounter something else larger 1328 * than that, just assume the maximum possible within our 1329 * reach. 1330 */ 1331 if (!v1_query) 1332 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); 1333 1334 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); 1335 1336 /* MLDv1 router present: we need to go into v1 mode *only* 1337 * when an MLDv1 query is received as per section 9.12. of 1338 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 1339 * queries MUST be of exactly 24 octets. 1340 */ 1341 if (v1_query) 1342 mld_set_v1_mode(idev); 1343 1344 /* cancel MLDv2 report work */ 1345 mld_gq_stop_work(idev); 1346 /* cancel the interface change work */ 1347 mld_ifc_stop_work(idev); 1348 /* clear deleted report items */ 1349 mld_clear_delrec(idev); 1350 1351 return 0; 1352 } 1353 1354 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, 1355 unsigned long *max_delay) 1356 { 1357 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); 1358 1359 mld_update_qrv(idev, mld); 1360 mld_update_qi(idev, mld); 1361 mld_update_qri(idev, mld); 1362 1363 idev->mc_maxdelay = *max_delay; 1364 1365 return 0; 1366 } 1367 1368 /* called with rcu_read_lock() */ 1369 int igmp6_event_query(struct sk_buff *skb) 1370 { 1371 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1372 1373 if (!idev) 1374 return -EINVAL; 1375 1376 if (idev->dead) { 1377 kfree_skb(skb); 1378 return -ENODEV; 1379 } 1380 1381 spin_lock_bh(&idev->mc_query_lock); 1382 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) { 1383 __skb_queue_tail(&idev->mc_query_queue, skb); 1384 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0)) 1385 in6_dev_hold(idev); 1386 } 1387 spin_unlock_bh(&idev->mc_query_lock); 1388 1389 return 0; 1390 } 1391 1392 static void __mld_query_work(struct sk_buff *skb) 1393 { 1394 struct mld2_query *mlh2 = NULL; 1395 const struct in6_addr *group; 1396 unsigned long max_delay; 1397 struct inet6_dev *idev; 1398 struct ifmcaddr6 *ma; 1399 struct mld_msg *mld; 1400 int group_type; 1401 int mark = 0; 1402 int len, err; 1403 1404 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1405 goto kfree_skb; 1406 1407 /* compute payload length excluding extension headers */ 1408 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1409 len -= skb_network_header_len(skb); 1410 1411 /* RFC3810 6.2 1412 * Upon reception of an MLD message that contains a Query, the node 1413 * checks if the source address of the message is a valid link-local 1414 * address, if the Hop Limit is set to 1, and if the Router Alert 1415 * option is present in the Hop-By-Hop Options header of the IPv6 1416 * packet. If any of these checks fails, the packet is dropped. 1417 */ 1418 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || 1419 ipv6_hdr(skb)->hop_limit != 1 || 1420 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || 1421 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) 1422 goto kfree_skb; 1423 1424 idev = in6_dev_get(skb->dev); 1425 if (!idev) 1426 goto kfree_skb; 1427 1428 mld = (struct mld_msg *)icmp6_hdr(skb); 1429 group = &mld->mld_mca; 1430 group_type = ipv6_addr_type(group); 1431 1432 if (group_type != IPV6_ADDR_ANY && 1433 !(group_type&IPV6_ADDR_MULTICAST)) 1434 goto out; 1435 1436 if (len < MLD_V1_QUERY_LEN) { 1437 goto out; 1438 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { 1439 err = mld_process_v1(idev, mld, &max_delay, 1440 len == MLD_V1_QUERY_LEN); 1441 if (err < 0) 1442 goto out; 1443 } else if (len >= MLD_V2_QUERY_LEN_MIN) { 1444 int srcs_offset = sizeof(struct mld2_query) - 1445 sizeof(struct icmp6hdr); 1446 1447 if (!pskb_may_pull(skb, srcs_offset)) 1448 goto out; 1449 1450 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1451 1452 err = mld_process_v2(idev, mlh2, &max_delay); 1453 if (err < 0) 1454 goto out; 1455 1456 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1457 if (mlh2->mld2q_nsrcs) 1458 goto out; /* no sources allowed */ 1459 1460 mld_gq_start_work(idev); 1461 goto out; 1462 } 1463 /* mark sources to include, if group & source-specific */ 1464 if (mlh2->mld2q_nsrcs != 0) { 1465 if (!pskb_may_pull(skb, srcs_offset + 1466 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) 1467 goto out; 1468 1469 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1470 mark = 1; 1471 } 1472 } else { 1473 goto out; 1474 } 1475 1476 if (group_type == IPV6_ADDR_ANY) { 1477 for_each_mc_mclock(idev, ma) { 1478 igmp6_group_queried(ma, max_delay); 1479 } 1480 } else { 1481 for_each_mc_mclock(idev, ma) { 1482 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1483 continue; 1484 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1485 /* gsquery <- gsquery && mark */ 1486 if (!mark) 1487 ma->mca_flags &= ~MAF_GSQUERY; 1488 } else { 1489 /* gsquery <- mark */ 1490 if (mark) 1491 ma->mca_flags |= MAF_GSQUERY; 1492 else 1493 ma->mca_flags &= ~MAF_GSQUERY; 1494 } 1495 if (!(ma->mca_flags & MAF_GSQUERY) || 1496 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1497 igmp6_group_queried(ma, max_delay); 1498 break; 1499 } 1500 } 1501 1502 out: 1503 in6_dev_put(idev); 1504 kfree_skb: 1505 consume_skb(skb); 1506 } 1507 1508 static void mld_query_work(struct work_struct *work) 1509 { 1510 struct inet6_dev *idev = container_of(to_delayed_work(work), 1511 struct inet6_dev, 1512 mc_query_work); 1513 struct sk_buff_head q; 1514 struct sk_buff *skb; 1515 bool rework = false; 1516 int cnt = 0; 1517 1518 skb_queue_head_init(&q); 1519 1520 spin_lock_bh(&idev->mc_query_lock); 1521 while ((skb = __skb_dequeue(&idev->mc_query_queue))) { 1522 __skb_queue_tail(&q, skb); 1523 1524 if (++cnt >= MLD_MAX_QUEUE) { 1525 rework = true; 1526 schedule_delayed_work(&idev->mc_query_work, 0); 1527 break; 1528 } 1529 } 1530 spin_unlock_bh(&idev->mc_query_lock); 1531 1532 mutex_lock(&idev->mc_lock); 1533 while ((skb = __skb_dequeue(&q))) 1534 __mld_query_work(skb); 1535 mutex_unlock(&idev->mc_lock); 1536 1537 if (!rework) 1538 in6_dev_put(idev); 1539 } 1540 1541 /* called with rcu_read_lock() */ 1542 int igmp6_event_report(struct sk_buff *skb) 1543 { 1544 struct inet6_dev *idev = __in6_dev_get(skb->dev); 1545 1546 if (!idev) 1547 return -EINVAL; 1548 1549 if (idev->dead) { 1550 kfree_skb(skb); 1551 return -ENODEV; 1552 } 1553 1554 spin_lock_bh(&idev->mc_report_lock); 1555 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) { 1556 __skb_queue_tail(&idev->mc_report_queue, skb); 1557 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0)) 1558 in6_dev_hold(idev); 1559 } 1560 spin_unlock_bh(&idev->mc_report_lock); 1561 1562 return 0; 1563 } 1564 1565 static void __mld_report_work(struct sk_buff *skb) 1566 { 1567 struct inet6_dev *idev; 1568 struct ifmcaddr6 *ma; 1569 struct mld_msg *mld; 1570 int addr_type; 1571 1572 /* Our own report looped back. Ignore it. */ 1573 if (skb->pkt_type == PACKET_LOOPBACK) 1574 goto kfree_skb; 1575 1576 /* send our report if the MC router may not have heard this report */ 1577 if (skb->pkt_type != PACKET_MULTICAST && 1578 skb->pkt_type != PACKET_BROADCAST) 1579 goto kfree_skb; 1580 1581 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1582 goto kfree_skb; 1583 1584 mld = (struct mld_msg *)icmp6_hdr(skb); 1585 1586 /* Drop reports with not link local source */ 1587 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1588 if (addr_type != IPV6_ADDR_ANY && 1589 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1590 goto kfree_skb; 1591 1592 idev = in6_dev_get(skb->dev); 1593 if (!idev) 1594 goto kfree_skb; 1595 1596 /* 1597 * Cancel the work for this group 1598 */ 1599 1600 for_each_mc_mclock(idev, ma) { 1601 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1602 if (cancel_delayed_work(&ma->mca_work)) 1603 refcount_dec(&ma->mca_refcnt); 1604 ma->mca_flags &= ~(MAF_LAST_REPORTER | 1605 MAF_TIMER_RUNNING); 1606 break; 1607 } 1608 } 1609 1610 in6_dev_put(idev); 1611 kfree_skb: 1612 consume_skb(skb); 1613 } 1614 1615 static void mld_report_work(struct work_struct *work) 1616 { 1617 struct inet6_dev *idev = container_of(to_delayed_work(work), 1618 struct inet6_dev, 1619 mc_report_work); 1620 struct sk_buff_head q; 1621 struct sk_buff *skb; 1622 bool rework = false; 1623 int cnt = 0; 1624 1625 skb_queue_head_init(&q); 1626 spin_lock_bh(&idev->mc_report_lock); 1627 while ((skb = __skb_dequeue(&idev->mc_report_queue))) { 1628 __skb_queue_tail(&q, skb); 1629 1630 if (++cnt >= MLD_MAX_QUEUE) { 1631 rework = true; 1632 schedule_delayed_work(&idev->mc_report_work, 0); 1633 break; 1634 } 1635 } 1636 spin_unlock_bh(&idev->mc_report_lock); 1637 1638 mutex_lock(&idev->mc_lock); 1639 while ((skb = __skb_dequeue(&q))) 1640 __mld_report_work(skb); 1641 mutex_unlock(&idev->mc_lock); 1642 1643 if (!rework) 1644 in6_dev_put(idev); 1645 } 1646 1647 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1648 int gdeleted, int sdeleted) 1649 { 1650 switch (type) { 1651 case MLD2_MODE_IS_INCLUDE: 1652 case MLD2_MODE_IS_EXCLUDE: 1653 if (gdeleted || sdeleted) 1654 return false; 1655 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1656 if (pmc->mca_sfmode == MCAST_INCLUDE) 1657 return true; 1658 /* don't include if this source is excluded 1659 * in all filters 1660 */ 1661 if (psf->sf_count[MCAST_INCLUDE]) 1662 return type == MLD2_MODE_IS_INCLUDE; 1663 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1664 psf->sf_count[MCAST_EXCLUDE]; 1665 } 1666 return false; 1667 case MLD2_CHANGE_TO_INCLUDE: 1668 if (gdeleted || sdeleted) 1669 return false; 1670 return psf->sf_count[MCAST_INCLUDE] != 0; 1671 case MLD2_CHANGE_TO_EXCLUDE: 1672 if (gdeleted || sdeleted) 1673 return false; 1674 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1675 psf->sf_count[MCAST_INCLUDE]) 1676 return false; 1677 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1678 psf->sf_count[MCAST_EXCLUDE]; 1679 case MLD2_ALLOW_NEW_SOURCES: 1680 if (gdeleted || !psf->sf_crcount) 1681 return false; 1682 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1683 case MLD2_BLOCK_OLD_SOURCES: 1684 if (pmc->mca_sfmode == MCAST_INCLUDE) 1685 return gdeleted || (psf->sf_crcount && sdeleted); 1686 return psf->sf_crcount && !gdeleted && !sdeleted; 1687 } 1688 return false; 1689 } 1690 1691 static int 1692 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1693 { 1694 struct ip6_sf_list *psf; 1695 int scount = 0; 1696 1697 for_each_psf_mclock(pmc, psf) { 1698 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1699 continue; 1700 scount++; 1701 } 1702 return scount; 1703 } 1704 1705 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, 1706 struct net_device *dev, 1707 const struct in6_addr *saddr, 1708 const struct in6_addr *daddr, 1709 int proto, int len) 1710 { 1711 struct ipv6hdr *hdr; 1712 1713 skb->protocol = htons(ETH_P_IPV6); 1714 skb->dev = dev; 1715 1716 skb_reset_network_header(skb); 1717 skb_put(skb, sizeof(struct ipv6hdr)); 1718 hdr = ipv6_hdr(skb); 1719 1720 ip6_flow_hdr(hdr, 0, 0); 1721 1722 hdr->payload_len = htons(len); 1723 hdr->nexthdr = proto; 1724 hdr->hop_limit = inet6_sk(sk)->hop_limit; 1725 1726 hdr->saddr = *saddr; 1727 hdr->daddr = *daddr; 1728 } 1729 1730 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) 1731 { 1732 struct net_device *dev = idev->dev; 1733 struct net *net = dev_net(dev); 1734 struct sock *sk = net->ipv6.igmp_sk; 1735 struct sk_buff *skb; 1736 struct mld2_report *pmr; 1737 struct in6_addr addr_buf; 1738 const struct in6_addr *saddr; 1739 int hlen = LL_RESERVED_SPACE(dev); 1740 int tlen = dev->needed_tailroom; 1741 unsigned int size = mtu + hlen + tlen; 1742 int err; 1743 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1744 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1745 IPV6_TLV_PADN, 0 }; 1746 1747 /* we assume size > sizeof(ra) here */ 1748 /* limit our allocations to order-0 page */ 1749 size = min_t(int, size, SKB_MAX_ORDER(0, 0)); 1750 skb = sock_alloc_send_skb(sk, size, 1, &err); 1751 1752 if (!skb) 1753 return NULL; 1754 1755 skb->priority = TC_PRIO_CONTROL; 1756 skb_reserve(skb, hlen); 1757 skb_tailroom_reserve(skb, mtu, tlen); 1758 1759 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { 1760 /* <draft-ietf-magma-mld-source-05.txt>: 1761 * use unspecified address as the source address 1762 * when a valid link-local address is not available. 1763 */ 1764 saddr = &in6addr_any; 1765 } else 1766 saddr = &addr_buf; 1767 1768 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1769 1770 skb_put_data(skb, ra, sizeof(ra)); 1771 1772 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1773 skb_put(skb, sizeof(*pmr)); 1774 pmr = (struct mld2_report *)skb_transport_header(skb); 1775 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1776 pmr->mld2r_resv1 = 0; 1777 pmr->mld2r_cksum = 0; 1778 pmr->mld2r_resv2 = 0; 1779 pmr->mld2r_ngrec = 0; 1780 return skb; 1781 } 1782 1783 static void mld_sendpack(struct sk_buff *skb) 1784 { 1785 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1786 struct mld2_report *pmr = 1787 (struct mld2_report *)skb_transport_header(skb); 1788 int payload_len, mldlen; 1789 struct inet6_dev *idev; 1790 struct net *net = dev_net(skb->dev); 1791 int err; 1792 struct flowi6 fl6; 1793 struct dst_entry *dst; 1794 1795 rcu_read_lock(); 1796 idev = __in6_dev_get(skb->dev); 1797 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1798 1799 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - 1800 sizeof(*pip6); 1801 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1802 pip6->payload_len = htons(payload_len); 1803 1804 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1805 IPPROTO_ICMPV6, 1806 csum_partial(skb_transport_header(skb), 1807 mldlen, 0)); 1808 1809 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, 1810 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1811 skb->dev->ifindex); 1812 dst = icmp6_dst_alloc(skb->dev, &fl6); 1813 1814 err = 0; 1815 if (IS_ERR(dst)) { 1816 err = PTR_ERR(dst); 1817 dst = NULL; 1818 } 1819 skb_dst_set(skb, dst); 1820 if (err) 1821 goto err_out; 1822 1823 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 1824 net, net->ipv6.igmp_sk, skb, NULL, skb->dev, 1825 dst_output); 1826 out: 1827 if (!err) { 1828 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); 1829 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1830 } else { 1831 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1832 } 1833 1834 rcu_read_unlock(); 1835 return; 1836 1837 err_out: 1838 kfree_skb(skb); 1839 goto out; 1840 } 1841 1842 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1843 { 1844 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1845 } 1846 1847 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1848 int type, struct mld2_grec **ppgr, unsigned int mtu) 1849 { 1850 struct mld2_report *pmr; 1851 struct mld2_grec *pgr; 1852 1853 if (!skb) { 1854 skb = mld_newpack(pmc->idev, mtu); 1855 if (!skb) 1856 return NULL; 1857 } 1858 pgr = skb_put(skb, sizeof(struct mld2_grec)); 1859 pgr->grec_type = type; 1860 pgr->grec_auxwords = 0; 1861 pgr->grec_nsrcs = 0; 1862 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1863 pmr = (struct mld2_report *)skb_transport_header(skb); 1864 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1865 *ppgr = pgr; 1866 return skb; 1867 } 1868 1869 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 1870 1871 /* called with mc_lock */ 1872 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1873 int type, int gdeleted, int sdeleted, 1874 int crsend) 1875 { 1876 struct ip6_sf_list *psf, *psf_prev, *psf_next; 1877 int scount, stotal, first, isquery, truncate; 1878 struct ip6_sf_list __rcu **psf_list; 1879 struct inet6_dev *idev = pmc->idev; 1880 struct net_device *dev = idev->dev; 1881 struct mld2_grec *pgr = NULL; 1882 struct mld2_report *pmr; 1883 unsigned int mtu; 1884 1885 if (pmc->mca_flags & MAF_NOREPORT) 1886 return skb; 1887 1888 mtu = READ_ONCE(dev->mtu); 1889 if (mtu < IPV6_MIN_MTU) 1890 return skb; 1891 1892 isquery = type == MLD2_MODE_IS_INCLUDE || 1893 type == MLD2_MODE_IS_EXCLUDE; 1894 truncate = type == MLD2_MODE_IS_EXCLUDE || 1895 type == MLD2_CHANGE_TO_EXCLUDE; 1896 1897 stotal = scount = 0; 1898 1899 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1900 1901 if (!rcu_access_pointer(*psf_list)) 1902 goto empty_source; 1903 1904 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1905 1906 /* EX and TO_EX get a fresh packet, if needed */ 1907 if (truncate) { 1908 if (pmr && pmr->mld2r_ngrec && 1909 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1910 if (skb) 1911 mld_sendpack(skb); 1912 skb = mld_newpack(idev, mtu); 1913 } 1914 } 1915 first = 1; 1916 psf_prev = NULL; 1917 for (psf = mc_dereference(*psf_list, idev); 1918 psf; 1919 psf = psf_next) { 1920 struct in6_addr *psrc; 1921 1922 psf_next = mc_dereference(psf->sf_next, idev); 1923 1924 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { 1925 psf_prev = psf; 1926 continue; 1927 } 1928 1929 /* Based on RFC3810 6.1. Should not send source-list change 1930 * records when there is a filter mode change. 1931 */ 1932 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || 1933 (!gdeleted && pmc->mca_crcount)) && 1934 (type == MLD2_ALLOW_NEW_SOURCES || 1935 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) 1936 goto decrease_sf_crcount; 1937 1938 /* clear marks on query responses */ 1939 if (isquery) 1940 psf->sf_gsresp = 0; 1941 1942 if (AVAILABLE(skb) < sizeof(*psrc) + 1943 first*sizeof(struct mld2_grec)) { 1944 if (truncate && !first) 1945 break; /* truncate these */ 1946 if (pgr) 1947 pgr->grec_nsrcs = htons(scount); 1948 if (skb) 1949 mld_sendpack(skb); 1950 skb = mld_newpack(idev, mtu); 1951 first = 1; 1952 scount = 0; 1953 } 1954 if (first) { 1955 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1956 first = 0; 1957 } 1958 if (!skb) 1959 return NULL; 1960 psrc = skb_put(skb, sizeof(*psrc)); 1961 *psrc = psf->sf_addr; 1962 scount++; stotal++; 1963 if ((type == MLD2_ALLOW_NEW_SOURCES || 1964 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1965 decrease_sf_crcount: 1966 psf->sf_crcount--; 1967 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1968 if (psf_prev) 1969 rcu_assign_pointer(psf_prev->sf_next, 1970 mc_dereference(psf->sf_next, idev)); 1971 else 1972 rcu_assign_pointer(*psf_list, 1973 mc_dereference(psf->sf_next, idev)); 1974 kfree_rcu(psf, rcu); 1975 continue; 1976 } 1977 } 1978 psf_prev = psf; 1979 } 1980 1981 empty_source: 1982 if (!stotal) { 1983 if (type == MLD2_ALLOW_NEW_SOURCES || 1984 type == MLD2_BLOCK_OLD_SOURCES) 1985 return skb; 1986 if (pmc->mca_crcount || isquery || crsend) { 1987 /* make sure we have room for group header */ 1988 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1989 mld_sendpack(skb); 1990 skb = NULL; /* add_grhead will get a new one */ 1991 } 1992 skb = add_grhead(skb, pmc, type, &pgr, mtu); 1993 } 1994 } 1995 if (pgr) 1996 pgr->grec_nsrcs = htons(scount); 1997 1998 if (isquery) 1999 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 2000 return skb; 2001 } 2002 2003 /* called with mc_lock */ 2004 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 2005 { 2006 struct sk_buff *skb = NULL; 2007 int type; 2008 2009 if (!pmc) { 2010 for_each_mc_mclock(idev, pmc) { 2011 if (pmc->mca_flags & MAF_NOREPORT) 2012 continue; 2013 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2014 type = MLD2_MODE_IS_EXCLUDE; 2015 else 2016 type = MLD2_MODE_IS_INCLUDE; 2017 skb = add_grec(skb, pmc, type, 0, 0, 0); 2018 } 2019 } else { 2020 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2021 type = MLD2_MODE_IS_EXCLUDE; 2022 else 2023 type = MLD2_MODE_IS_INCLUDE; 2024 skb = add_grec(skb, pmc, type, 0, 0, 0); 2025 } 2026 if (skb) 2027 mld_sendpack(skb); 2028 } 2029 2030 /* 2031 * remove zero-count source records from a source filter list 2032 * called with mc_lock 2033 */ 2034 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) 2035 { 2036 struct ip6_sf_list *psf_prev, *psf_next, *psf; 2037 2038 psf_prev = NULL; 2039 for (psf = mc_dereference(*ppsf, idev); 2040 psf; 2041 psf = psf_next) { 2042 psf_next = mc_dereference(psf->sf_next, idev); 2043 if (psf->sf_crcount == 0) { 2044 if (psf_prev) 2045 rcu_assign_pointer(psf_prev->sf_next, 2046 mc_dereference(psf->sf_next, idev)); 2047 else 2048 rcu_assign_pointer(*ppsf, 2049 mc_dereference(psf->sf_next, idev)); 2050 kfree_rcu(psf, rcu); 2051 } else { 2052 psf_prev = psf; 2053 } 2054 } 2055 } 2056 2057 /* called with mc_lock */ 2058 static void mld_send_cr(struct inet6_dev *idev) 2059 { 2060 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 2061 struct sk_buff *skb = NULL; 2062 int type, dtype; 2063 2064 /* deleted MCA's */ 2065 pmc_prev = NULL; 2066 for (pmc = mc_dereference(idev->mc_tomb, idev); 2067 pmc; 2068 pmc = pmc_next) { 2069 pmc_next = mc_dereference(pmc->next, idev); 2070 if (pmc->mca_sfmode == MCAST_INCLUDE) { 2071 type = MLD2_BLOCK_OLD_SOURCES; 2072 dtype = MLD2_BLOCK_OLD_SOURCES; 2073 skb = add_grec(skb, pmc, type, 1, 0, 0); 2074 skb = add_grec(skb, pmc, dtype, 1, 1, 0); 2075 } 2076 if (pmc->mca_crcount) { 2077 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 2078 type = MLD2_CHANGE_TO_INCLUDE; 2079 skb = add_grec(skb, pmc, type, 1, 0, 0); 2080 } 2081 pmc->mca_crcount--; 2082 if (pmc->mca_crcount == 0) { 2083 mld_clear_zeros(&pmc->mca_tomb, idev); 2084 mld_clear_zeros(&pmc->mca_sources, idev); 2085 } 2086 } 2087 if (pmc->mca_crcount == 0 && 2088 !rcu_access_pointer(pmc->mca_tomb) && 2089 !rcu_access_pointer(pmc->mca_sources)) { 2090 if (pmc_prev) 2091 rcu_assign_pointer(pmc_prev->next, pmc_next); 2092 else 2093 rcu_assign_pointer(idev->mc_tomb, pmc_next); 2094 in6_dev_put(pmc->idev); 2095 kfree_rcu(pmc, rcu); 2096 } else 2097 pmc_prev = pmc; 2098 } 2099 2100 /* change recs */ 2101 for_each_mc_mclock(idev, pmc) { 2102 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2103 type = MLD2_BLOCK_OLD_SOURCES; 2104 dtype = MLD2_ALLOW_NEW_SOURCES; 2105 } else { 2106 type = MLD2_ALLOW_NEW_SOURCES; 2107 dtype = MLD2_BLOCK_OLD_SOURCES; 2108 } 2109 skb = add_grec(skb, pmc, type, 0, 0, 0); 2110 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ 2111 2112 /* filter mode changes */ 2113 if (pmc->mca_crcount) { 2114 if (pmc->mca_sfmode == MCAST_EXCLUDE) 2115 type = MLD2_CHANGE_TO_EXCLUDE; 2116 else 2117 type = MLD2_CHANGE_TO_INCLUDE; 2118 skb = add_grec(skb, pmc, type, 0, 0, 0); 2119 pmc->mca_crcount--; 2120 } 2121 } 2122 if (!skb) 2123 return; 2124 (void) mld_sendpack(skb); 2125 } 2126 2127 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 2128 { 2129 struct net *net = dev_net(dev); 2130 struct sock *sk = net->ipv6.igmp_sk; 2131 struct inet6_dev *idev; 2132 struct sk_buff *skb; 2133 struct mld_msg *hdr; 2134 const struct in6_addr *snd_addr, *saddr; 2135 struct in6_addr addr_buf; 2136 int hlen = LL_RESERVED_SPACE(dev); 2137 int tlen = dev->needed_tailroom; 2138 int err, len, payload_len, full_len; 2139 u8 ra[8] = { IPPROTO_ICMPV6, 0, 2140 IPV6_TLV_ROUTERALERT, 2, 0, 0, 2141 IPV6_TLV_PADN, 0 }; 2142 struct flowi6 fl6; 2143 struct dst_entry *dst; 2144 2145 if (type == ICMPV6_MGM_REDUCTION) 2146 snd_addr = &in6addr_linklocal_allrouters; 2147 else 2148 snd_addr = addr; 2149 2150 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 2151 payload_len = len + sizeof(ra); 2152 full_len = sizeof(struct ipv6hdr) + payload_len; 2153 2154 rcu_read_lock(); 2155 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 2156 IPSTATS_MIB_OUT, full_len); 2157 rcu_read_unlock(); 2158 2159 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); 2160 2161 if (!skb) { 2162 rcu_read_lock(); 2163 IP6_INC_STATS(net, __in6_dev_get(dev), 2164 IPSTATS_MIB_OUTDISCARDS); 2165 rcu_read_unlock(); 2166 return; 2167 } 2168 skb->priority = TC_PRIO_CONTROL; 2169 skb_reserve(skb, hlen); 2170 2171 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 2172 /* <draft-ietf-magma-mld-source-05.txt>: 2173 * use unspecified address as the source address 2174 * when a valid link-local address is not available. 2175 */ 2176 saddr = &in6addr_any; 2177 } else 2178 saddr = &addr_buf; 2179 2180 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 2181 2182 skb_put_data(skb, ra, sizeof(ra)); 2183 2184 hdr = skb_put_zero(skb, sizeof(struct mld_msg)); 2185 hdr->mld_type = type; 2186 hdr->mld_mca = *addr; 2187 2188 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 2189 IPPROTO_ICMPV6, 2190 csum_partial(hdr, len, 0)); 2191 2192 rcu_read_lock(); 2193 idev = __in6_dev_get(skb->dev); 2194 2195 icmpv6_flow_init(sk, &fl6, type, 2196 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 2197 skb->dev->ifindex); 2198 dst = icmp6_dst_alloc(skb->dev, &fl6); 2199 if (IS_ERR(dst)) { 2200 err = PTR_ERR(dst); 2201 goto err_out; 2202 } 2203 2204 skb_dst_set(skb, dst); 2205 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, 2206 net, sk, skb, NULL, skb->dev, 2207 dst_output); 2208 out: 2209 if (!err) { 2210 ICMP6MSGOUT_INC_STATS(net, idev, type); 2211 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 2212 } else 2213 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 2214 2215 rcu_read_unlock(); 2216 return; 2217 2218 err_out: 2219 kfree_skb(skb); 2220 goto out; 2221 } 2222 2223 /* called with mc_lock */ 2224 static void mld_send_initial_cr(struct inet6_dev *idev) 2225 { 2226 struct sk_buff *skb; 2227 struct ifmcaddr6 *pmc; 2228 int type; 2229 2230 if (mld_in_v1_mode(idev)) 2231 return; 2232 2233 skb = NULL; 2234 for_each_mc_mclock(idev, pmc) { 2235 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2236 type = MLD2_CHANGE_TO_EXCLUDE; 2237 else 2238 type = MLD2_ALLOW_NEW_SOURCES; 2239 skb = add_grec(skb, pmc, type, 0, 0, 1); 2240 } 2241 if (skb) 2242 mld_sendpack(skb); 2243 } 2244 2245 void ipv6_mc_dad_complete(struct inet6_dev *idev) 2246 { 2247 mutex_lock(&idev->mc_lock); 2248 idev->mc_dad_count = idev->mc_qrv; 2249 if (idev->mc_dad_count) { 2250 mld_send_initial_cr(idev); 2251 idev->mc_dad_count--; 2252 if (idev->mc_dad_count) 2253 mld_dad_start_work(idev, 2254 unsolicited_report_interval(idev)); 2255 } 2256 mutex_unlock(&idev->mc_lock); 2257 } 2258 2259 static void mld_dad_work(struct work_struct *work) 2260 { 2261 struct inet6_dev *idev = container_of(to_delayed_work(work), 2262 struct inet6_dev, 2263 mc_dad_work); 2264 mutex_lock(&idev->mc_lock); 2265 mld_send_initial_cr(idev); 2266 if (idev->mc_dad_count) { 2267 idev->mc_dad_count--; 2268 if (idev->mc_dad_count) 2269 mld_dad_start_work(idev, 2270 unsolicited_report_interval(idev)); 2271 } 2272 mutex_unlock(&idev->mc_lock); 2273 in6_dev_put(idev); 2274 } 2275 2276 /* called with mc_lock */ 2277 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 2278 const struct in6_addr *psfsrc) 2279 { 2280 struct ip6_sf_list *psf, *psf_prev; 2281 int rv = 0; 2282 2283 psf_prev = NULL; 2284 for_each_psf_mclock(pmc, psf) { 2285 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2286 break; 2287 psf_prev = psf; 2288 } 2289 if (!psf || psf->sf_count[sfmode] == 0) { 2290 /* source filter not found, or count wrong => bug */ 2291 return -ESRCH; 2292 } 2293 psf->sf_count[sfmode]--; 2294 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 2295 struct inet6_dev *idev = pmc->idev; 2296 2297 /* no more filters for this source */ 2298 if (psf_prev) 2299 rcu_assign_pointer(psf_prev->sf_next, 2300 mc_dereference(psf->sf_next, idev)); 2301 else 2302 rcu_assign_pointer(pmc->mca_sources, 2303 mc_dereference(psf->sf_next, idev)); 2304 2305 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 2306 !mld_in_v1_mode(idev)) { 2307 psf->sf_crcount = idev->mc_qrv; 2308 rcu_assign_pointer(psf->sf_next, 2309 mc_dereference(pmc->mca_tomb, idev)); 2310 rcu_assign_pointer(pmc->mca_tomb, psf); 2311 rv = 1; 2312 } else { 2313 kfree_rcu(psf, rcu); 2314 } 2315 } 2316 return rv; 2317 } 2318 2319 /* called with mc_lock */ 2320 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2321 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2322 int delta) 2323 { 2324 struct ifmcaddr6 *pmc; 2325 int changerec = 0; 2326 int i, err; 2327 2328 if (!idev) 2329 return -ENODEV; 2330 2331 for_each_mc_mclock(idev, pmc) { 2332 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2333 break; 2334 } 2335 if (!pmc) 2336 return -ESRCH; 2337 2338 sf_markstate(pmc); 2339 if (!delta) { 2340 if (!pmc->mca_sfcount[sfmode]) 2341 return -EINVAL; 2342 2343 pmc->mca_sfcount[sfmode]--; 2344 } 2345 err = 0; 2346 for (i = 0; i < sfcount; i++) { 2347 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2348 2349 changerec |= rv > 0; 2350 if (!err && rv < 0) 2351 err = rv; 2352 } 2353 if (pmc->mca_sfmode == MCAST_EXCLUDE && 2354 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 2355 pmc->mca_sfcount[MCAST_INCLUDE]) { 2356 struct ip6_sf_list *psf; 2357 2358 /* filter mode change */ 2359 pmc->mca_sfmode = MCAST_INCLUDE; 2360 pmc->mca_crcount = idev->mc_qrv; 2361 idev->mc_ifc_count = pmc->mca_crcount; 2362 for_each_psf_mclock(pmc, psf) 2363 psf->sf_crcount = 0; 2364 mld_ifc_event(pmc->idev); 2365 } else if (sf_setstate(pmc) || changerec) { 2366 mld_ifc_event(pmc->idev); 2367 } 2368 2369 return err; 2370 } 2371 2372 /* 2373 * Add multicast single-source filter to the interface list 2374 * called with mc_lock 2375 */ 2376 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 2377 const struct in6_addr *psfsrc) 2378 { 2379 struct ip6_sf_list *psf, *psf_prev; 2380 2381 psf_prev = NULL; 2382 for_each_psf_mclock(pmc, psf) { 2383 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 2384 break; 2385 psf_prev = psf; 2386 } 2387 if (!psf) { 2388 psf = kzalloc(sizeof(*psf), GFP_KERNEL); 2389 if (!psf) 2390 return -ENOBUFS; 2391 2392 psf->sf_addr = *psfsrc; 2393 if (psf_prev) { 2394 rcu_assign_pointer(psf_prev->sf_next, psf); 2395 } else { 2396 rcu_assign_pointer(pmc->mca_sources, psf); 2397 } 2398 } 2399 psf->sf_count[sfmode]++; 2400 return 0; 2401 } 2402 2403 /* called with mc_lock */ 2404 static void sf_markstate(struct ifmcaddr6 *pmc) 2405 { 2406 struct ip6_sf_list *psf; 2407 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2408 2409 for_each_psf_mclock(pmc, psf) { 2410 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2411 psf->sf_oldin = mca_xcount == 2412 psf->sf_count[MCAST_EXCLUDE] && 2413 !psf->sf_count[MCAST_INCLUDE]; 2414 } else { 2415 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2416 } 2417 } 2418 } 2419 2420 /* called with mc_lock */ 2421 static int sf_setstate(struct ifmcaddr6 *pmc) 2422 { 2423 struct ip6_sf_list *psf, *dpsf; 2424 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2425 int qrv = pmc->idev->mc_qrv; 2426 int new_in, rv; 2427 2428 rv = 0; 2429 for_each_psf_mclock(pmc, psf) { 2430 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2431 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2432 !psf->sf_count[MCAST_INCLUDE]; 2433 } else 2434 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2435 if (new_in) { 2436 if (!psf->sf_oldin) { 2437 struct ip6_sf_list *prev = NULL; 2438 2439 for_each_psf_tomb(pmc, dpsf) { 2440 if (ipv6_addr_equal(&dpsf->sf_addr, 2441 &psf->sf_addr)) 2442 break; 2443 prev = dpsf; 2444 } 2445 if (dpsf) { 2446 if (prev) 2447 rcu_assign_pointer(prev->sf_next, 2448 mc_dereference(dpsf->sf_next, 2449 pmc->idev)); 2450 else 2451 rcu_assign_pointer(pmc->mca_tomb, 2452 mc_dereference(dpsf->sf_next, 2453 pmc->idev)); 2454 kfree_rcu(dpsf, rcu); 2455 } 2456 psf->sf_crcount = qrv; 2457 rv++; 2458 } 2459 } else if (psf->sf_oldin) { 2460 psf->sf_crcount = 0; 2461 /* 2462 * add or update "delete" records if an active filter 2463 * is now inactive 2464 */ 2465 2466 for_each_psf_tomb(pmc, dpsf) 2467 if (ipv6_addr_equal(&dpsf->sf_addr, 2468 &psf->sf_addr)) 2469 break; 2470 if (!dpsf) { 2471 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL); 2472 if (!dpsf) 2473 continue; 2474 *dpsf = *psf; 2475 rcu_assign_pointer(dpsf->sf_next, 2476 mc_dereference(pmc->mca_tomb, pmc->idev)); 2477 rcu_assign_pointer(pmc->mca_tomb, dpsf); 2478 } 2479 dpsf->sf_crcount = qrv; 2480 rv++; 2481 } 2482 } 2483 return rv; 2484 } 2485 2486 /* 2487 * Add multicast source filter list to the interface list 2488 * called with mc_lock 2489 */ 2490 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, 2491 int sfmode, int sfcount, const struct in6_addr *psfsrc, 2492 int delta) 2493 { 2494 struct ifmcaddr6 *pmc; 2495 int isexclude; 2496 int i, err; 2497 2498 if (!idev) 2499 return -ENODEV; 2500 2501 for_each_mc_mclock(idev, pmc) { 2502 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2503 break; 2504 } 2505 if (!pmc) 2506 return -ESRCH; 2507 2508 sf_markstate(pmc); 2509 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2510 if (!delta) 2511 pmc->mca_sfcount[sfmode]++; 2512 err = 0; 2513 for (i = 0; i < sfcount; i++) { 2514 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2515 if (err) 2516 break; 2517 } 2518 if (err) { 2519 int j; 2520 2521 if (!delta) 2522 pmc->mca_sfcount[sfmode]--; 2523 for (j = 0; j < i; j++) 2524 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2525 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2526 struct ip6_sf_list *psf; 2527 2528 /* filter mode change */ 2529 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2530 pmc->mca_sfmode = MCAST_EXCLUDE; 2531 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2532 pmc->mca_sfmode = MCAST_INCLUDE; 2533 /* else no filters; keep old mode for reports */ 2534 2535 pmc->mca_crcount = idev->mc_qrv; 2536 idev->mc_ifc_count = pmc->mca_crcount; 2537 for_each_psf_mclock(pmc, psf) 2538 psf->sf_crcount = 0; 2539 mld_ifc_event(idev); 2540 } else if (sf_setstate(pmc)) { 2541 mld_ifc_event(idev); 2542 } 2543 return err; 2544 } 2545 2546 /* called with mc_lock */ 2547 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2548 { 2549 struct ip6_sf_list *psf, *nextpsf; 2550 2551 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); 2552 psf; 2553 psf = nextpsf) { 2554 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2555 kfree_rcu(psf, rcu); 2556 } 2557 RCU_INIT_POINTER(pmc->mca_tomb, NULL); 2558 for (psf = mc_dereference(pmc->mca_sources, pmc->idev); 2559 psf; 2560 psf = nextpsf) { 2561 nextpsf = mc_dereference(psf->sf_next, pmc->idev); 2562 kfree_rcu(psf, rcu); 2563 } 2564 RCU_INIT_POINTER(pmc->mca_sources, NULL); 2565 pmc->mca_sfmode = MCAST_EXCLUDE; 2566 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2567 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2568 } 2569 2570 /* called with mc_lock */ 2571 static void igmp6_join_group(struct ifmcaddr6 *ma) 2572 { 2573 unsigned long delay; 2574 2575 if (ma->mca_flags & MAF_NOREPORT) 2576 return; 2577 2578 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2579 2580 delay = prandom_u32() % unsolicited_report_interval(ma->idev); 2581 2582 if (cancel_delayed_work(&ma->mca_work)) { 2583 refcount_dec(&ma->mca_refcnt); 2584 delay = ma->mca_work.timer.expires - jiffies; 2585 } 2586 2587 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay)) 2588 refcount_inc(&ma->mca_refcnt); 2589 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2590 } 2591 2592 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2593 struct inet6_dev *idev) 2594 { 2595 struct ip6_sf_socklist *psl; 2596 int err; 2597 2598 psl = sock_dereference(iml->sflist, sk); 2599 2600 if (idev) 2601 mutex_lock(&idev->mc_lock); 2602 2603 if (!psl) { 2604 /* any-source empty exclude case */ 2605 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2606 } else { 2607 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2608 psl->sl_count, psl->sl_addr, 0); 2609 RCU_INIT_POINTER(iml->sflist, NULL); 2610 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2611 kfree_rcu(psl, rcu); 2612 } 2613 2614 if (idev) 2615 mutex_unlock(&idev->mc_lock); 2616 2617 return err; 2618 } 2619 2620 /* called with mc_lock */ 2621 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2622 { 2623 if (mld_in_v1_mode(ma->idev)) { 2624 if (ma->mca_flags & MAF_LAST_REPORTER) { 2625 igmp6_send(&ma->mca_addr, ma->idev->dev, 2626 ICMPV6_MGM_REDUCTION); 2627 } 2628 } else { 2629 mld_add_delrec(ma->idev, ma); 2630 mld_ifc_event(ma->idev); 2631 } 2632 } 2633 2634 static void mld_gq_work(struct work_struct *work) 2635 { 2636 struct inet6_dev *idev = container_of(to_delayed_work(work), 2637 struct inet6_dev, 2638 mc_gq_work); 2639 2640 mutex_lock(&idev->mc_lock); 2641 mld_send_report(idev, NULL); 2642 idev->mc_gq_running = 0; 2643 mutex_unlock(&idev->mc_lock); 2644 2645 in6_dev_put(idev); 2646 } 2647 2648 static void mld_ifc_work(struct work_struct *work) 2649 { 2650 struct inet6_dev *idev = container_of(to_delayed_work(work), 2651 struct inet6_dev, 2652 mc_ifc_work); 2653 2654 mutex_lock(&idev->mc_lock); 2655 mld_send_cr(idev); 2656 2657 if (idev->mc_ifc_count) { 2658 idev->mc_ifc_count--; 2659 if (idev->mc_ifc_count) 2660 mld_ifc_start_work(idev, 2661 unsolicited_report_interval(idev)); 2662 } 2663 mutex_unlock(&idev->mc_lock); 2664 in6_dev_put(idev); 2665 } 2666 2667 /* called with mc_lock */ 2668 static void mld_ifc_event(struct inet6_dev *idev) 2669 { 2670 if (mld_in_v1_mode(idev)) 2671 return; 2672 2673 idev->mc_ifc_count = idev->mc_qrv; 2674 mld_ifc_start_work(idev, 1); 2675 } 2676 2677 static void mld_mca_work(struct work_struct *work) 2678 { 2679 struct ifmcaddr6 *ma = container_of(to_delayed_work(work), 2680 struct ifmcaddr6, mca_work); 2681 2682 mutex_lock(&ma->idev->mc_lock); 2683 if (mld_in_v1_mode(ma->idev)) 2684 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2685 else 2686 mld_send_report(ma->idev, ma); 2687 ma->mca_flags |= MAF_LAST_REPORTER; 2688 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2689 mutex_unlock(&ma->idev->mc_lock); 2690 2691 ma_put(ma); 2692 } 2693 2694 /* Device changing type */ 2695 2696 void ipv6_mc_unmap(struct inet6_dev *idev) 2697 { 2698 struct ifmcaddr6 *i; 2699 2700 /* Install multicast list, except for all-nodes (already installed) */ 2701 2702 mutex_lock(&idev->mc_lock); 2703 for_each_mc_mclock(idev, i) 2704 igmp6_group_dropped(i); 2705 mutex_unlock(&idev->mc_lock); 2706 } 2707 2708 void ipv6_mc_remap(struct inet6_dev *idev) 2709 { 2710 ipv6_mc_up(idev); 2711 } 2712 2713 /* Device going down */ 2714 void ipv6_mc_down(struct inet6_dev *idev) 2715 { 2716 struct ifmcaddr6 *i; 2717 2718 mutex_lock(&idev->mc_lock); 2719 /* Withdraw multicast list */ 2720 for_each_mc_mclock(idev, i) 2721 igmp6_group_dropped(i); 2722 mutex_unlock(&idev->mc_lock); 2723 2724 /* Should stop work after group drop. or we will 2725 * start work again in mld_ifc_event() 2726 */ 2727 synchronize_net(); 2728 mld_query_stop_work(idev); 2729 mld_report_stop_work(idev); 2730 mld_ifc_stop_work(idev); 2731 mld_gq_stop_work(idev); 2732 mld_dad_stop_work(idev); 2733 } 2734 2735 static void ipv6_mc_reset(struct inet6_dev *idev) 2736 { 2737 idev->mc_qrv = sysctl_mld_qrv; 2738 idev->mc_qi = MLD_QI_DEFAULT; 2739 idev->mc_qri = MLD_QRI_DEFAULT; 2740 idev->mc_v1_seen = 0; 2741 idev->mc_maxdelay = unsolicited_report_interval(idev); 2742 } 2743 2744 /* Device going up */ 2745 2746 void ipv6_mc_up(struct inet6_dev *idev) 2747 { 2748 struct ifmcaddr6 *i; 2749 2750 /* Install multicast list, except for all-nodes (already installed) */ 2751 2752 ipv6_mc_reset(idev); 2753 mutex_lock(&idev->mc_lock); 2754 for_each_mc_mclock(idev, i) { 2755 mld_del_delrec(idev, i); 2756 igmp6_group_added(i); 2757 } 2758 mutex_unlock(&idev->mc_lock); 2759 } 2760 2761 /* IPv6 device initialization. */ 2762 2763 void ipv6_mc_init_dev(struct inet6_dev *idev) 2764 { 2765 idev->mc_gq_running = 0; 2766 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); 2767 RCU_INIT_POINTER(idev->mc_tomb, NULL); 2768 idev->mc_ifc_count = 0; 2769 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); 2770 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); 2771 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); 2772 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); 2773 skb_queue_head_init(&idev->mc_query_queue); 2774 skb_queue_head_init(&idev->mc_report_queue); 2775 spin_lock_init(&idev->mc_query_lock); 2776 spin_lock_init(&idev->mc_report_lock); 2777 mutex_init(&idev->mc_lock); 2778 ipv6_mc_reset(idev); 2779 } 2780 2781 /* 2782 * Device is about to be destroyed: clean up. 2783 */ 2784 2785 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2786 { 2787 struct ifmcaddr6 *i; 2788 2789 /* Deactivate works */ 2790 ipv6_mc_down(idev); 2791 mutex_lock(&idev->mc_lock); 2792 mld_clear_delrec(idev); 2793 mutex_unlock(&idev->mc_lock); 2794 mld_clear_query(idev); 2795 mld_clear_report(idev); 2796 2797 /* Delete all-nodes address. */ 2798 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2799 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2800 * fail. 2801 */ 2802 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2803 2804 if (idev->cnf.forwarding) 2805 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2806 2807 mutex_lock(&idev->mc_lock); 2808 while ((i = mc_dereference(idev->mc_list, idev))) { 2809 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); 2810 2811 ip6_mc_clear_src(i); 2812 ma_put(i); 2813 } 2814 mutex_unlock(&idev->mc_lock); 2815 } 2816 2817 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) 2818 { 2819 struct ifmcaddr6 *pmc; 2820 2821 ASSERT_RTNL(); 2822 2823 mutex_lock(&idev->mc_lock); 2824 if (mld_in_v1_mode(idev)) { 2825 for_each_mc_mclock(idev, pmc) 2826 igmp6_join_group(pmc); 2827 } else { 2828 mld_send_report(idev, NULL); 2829 } 2830 mutex_unlock(&idev->mc_lock); 2831 } 2832 2833 static int ipv6_mc_netdev_event(struct notifier_block *this, 2834 unsigned long event, 2835 void *ptr) 2836 { 2837 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2838 struct inet6_dev *idev = __in6_dev_get(dev); 2839 2840 switch (event) { 2841 case NETDEV_RESEND_IGMP: 2842 if (idev) 2843 ipv6_mc_rejoin_groups(idev); 2844 break; 2845 default: 2846 break; 2847 } 2848 2849 return NOTIFY_DONE; 2850 } 2851 2852 static struct notifier_block igmp6_netdev_notifier = { 2853 .notifier_call = ipv6_mc_netdev_event, 2854 }; 2855 2856 #ifdef CONFIG_PROC_FS 2857 struct igmp6_mc_iter_state { 2858 struct seq_net_private p; 2859 struct net_device *dev; 2860 struct inet6_dev *idev; 2861 }; 2862 2863 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2864 2865 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2866 { 2867 struct ifmcaddr6 *im = NULL; 2868 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2869 struct net *net = seq_file_net(seq); 2870 2871 state->idev = NULL; 2872 for_each_netdev_rcu(net, state->dev) { 2873 struct inet6_dev *idev; 2874 idev = __in6_dev_get(state->dev); 2875 if (!idev) 2876 continue; 2877 2878 im = rcu_dereference(idev->mc_list); 2879 if (im) { 2880 state->idev = idev; 2881 break; 2882 } 2883 } 2884 return im; 2885 } 2886 2887 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2888 { 2889 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2890 2891 im = rcu_dereference(im->next); 2892 while (!im) { 2893 state->dev = next_net_device_rcu(state->dev); 2894 if (!state->dev) { 2895 state->idev = NULL; 2896 break; 2897 } 2898 state->idev = __in6_dev_get(state->dev); 2899 if (!state->idev) 2900 continue; 2901 im = rcu_dereference(state->idev->mc_list); 2902 } 2903 return im; 2904 } 2905 2906 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2907 { 2908 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2909 if (im) 2910 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2911 --pos; 2912 return pos ? NULL : im; 2913 } 2914 2915 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2916 __acquires(RCU) 2917 { 2918 rcu_read_lock(); 2919 return igmp6_mc_get_idx(seq, *pos); 2920 } 2921 2922 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2923 { 2924 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2925 2926 ++*pos; 2927 return im; 2928 } 2929 2930 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2931 __releases(RCU) 2932 { 2933 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2934 2935 if (likely(state->idev)) 2936 state->idev = NULL; 2937 state->dev = NULL; 2938 rcu_read_unlock(); 2939 } 2940 2941 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2942 { 2943 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2944 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2945 2946 seq_printf(seq, 2947 "%-4d %-15s %pi6 %5d %08X %ld\n", 2948 state->dev->ifindex, state->dev->name, 2949 &im->mca_addr, 2950 im->mca_users, im->mca_flags, 2951 (im->mca_flags & MAF_TIMER_RUNNING) ? 2952 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0); 2953 return 0; 2954 } 2955 2956 static const struct seq_operations igmp6_mc_seq_ops = { 2957 .start = igmp6_mc_seq_start, 2958 .next = igmp6_mc_seq_next, 2959 .stop = igmp6_mc_seq_stop, 2960 .show = igmp6_mc_seq_show, 2961 }; 2962 2963 struct igmp6_mcf_iter_state { 2964 struct seq_net_private p; 2965 struct net_device *dev; 2966 struct inet6_dev *idev; 2967 struct ifmcaddr6 *im; 2968 }; 2969 2970 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2971 2972 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2973 { 2974 struct ip6_sf_list *psf = NULL; 2975 struct ifmcaddr6 *im = NULL; 2976 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2977 struct net *net = seq_file_net(seq); 2978 2979 state->idev = NULL; 2980 state->im = NULL; 2981 for_each_netdev_rcu(net, state->dev) { 2982 struct inet6_dev *idev; 2983 idev = __in6_dev_get(state->dev); 2984 if (unlikely(idev == NULL)) 2985 continue; 2986 2987 im = rcu_dereference(idev->mc_list); 2988 if (likely(im)) { 2989 psf = rcu_dereference(im->mca_sources); 2990 if (likely(psf)) { 2991 state->im = im; 2992 state->idev = idev; 2993 break; 2994 } 2995 } 2996 } 2997 return psf; 2998 } 2999 3000 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 3001 { 3002 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3003 3004 psf = rcu_dereference(psf->sf_next); 3005 while (!psf) { 3006 state->im = rcu_dereference(state->im->next); 3007 while (!state->im) { 3008 state->dev = next_net_device_rcu(state->dev); 3009 if (!state->dev) { 3010 state->idev = NULL; 3011 goto out; 3012 } 3013 state->idev = __in6_dev_get(state->dev); 3014 if (!state->idev) 3015 continue; 3016 state->im = rcu_dereference(state->idev->mc_list); 3017 } 3018 if (!state->im) 3019 break; 3020 psf = rcu_dereference(state->im->mca_sources); 3021 } 3022 out: 3023 return psf; 3024 } 3025 3026 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 3027 { 3028 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 3029 if (psf) 3030 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 3031 --pos; 3032 return pos ? NULL : psf; 3033 } 3034 3035 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 3036 __acquires(RCU) 3037 { 3038 rcu_read_lock(); 3039 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 3040 } 3041 3042 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3043 { 3044 struct ip6_sf_list *psf; 3045 if (v == SEQ_START_TOKEN) 3046 psf = igmp6_mcf_get_first(seq); 3047 else 3048 psf = igmp6_mcf_get_next(seq, v); 3049 ++*pos; 3050 return psf; 3051 } 3052 3053 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 3054 __releases(RCU) 3055 { 3056 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3057 3058 if (likely(state->im)) 3059 state->im = NULL; 3060 if (likely(state->idev)) 3061 state->idev = NULL; 3062 3063 state->dev = NULL; 3064 rcu_read_unlock(); 3065 } 3066 3067 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 3068 { 3069 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 3070 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 3071 3072 if (v == SEQ_START_TOKEN) { 3073 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); 3074 } else { 3075 seq_printf(seq, 3076 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 3077 state->dev->ifindex, state->dev->name, 3078 &state->im->mca_addr, 3079 &psf->sf_addr, 3080 psf->sf_count[MCAST_INCLUDE], 3081 psf->sf_count[MCAST_EXCLUDE]); 3082 } 3083 return 0; 3084 } 3085 3086 static const struct seq_operations igmp6_mcf_seq_ops = { 3087 .start = igmp6_mcf_seq_start, 3088 .next = igmp6_mcf_seq_next, 3089 .stop = igmp6_mcf_seq_stop, 3090 .show = igmp6_mcf_seq_show, 3091 }; 3092 3093 static int __net_init igmp6_proc_init(struct net *net) 3094 { 3095 int err; 3096 3097 err = -ENOMEM; 3098 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, 3099 sizeof(struct igmp6_mc_iter_state))) 3100 goto out; 3101 if (!proc_create_net("mcfilter6", 0444, net->proc_net, 3102 &igmp6_mcf_seq_ops, 3103 sizeof(struct igmp6_mcf_iter_state))) 3104 goto out_proc_net_igmp6; 3105 3106 err = 0; 3107 out: 3108 return err; 3109 3110 out_proc_net_igmp6: 3111 remove_proc_entry("igmp6", net->proc_net); 3112 goto out; 3113 } 3114 3115 static void __net_exit igmp6_proc_exit(struct net *net) 3116 { 3117 remove_proc_entry("mcfilter6", net->proc_net); 3118 remove_proc_entry("igmp6", net->proc_net); 3119 } 3120 #else 3121 static inline int igmp6_proc_init(struct net *net) 3122 { 3123 return 0; 3124 } 3125 static inline void igmp6_proc_exit(struct net *net) 3126 { 3127 } 3128 #endif 3129 3130 static int __net_init igmp6_net_init(struct net *net) 3131 { 3132 int err; 3133 3134 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 3135 SOCK_RAW, IPPROTO_ICMPV6, net); 3136 if (err < 0) { 3137 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", 3138 err); 3139 goto out; 3140 } 3141 3142 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 3143 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; 3144 3145 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, 3146 SOCK_RAW, IPPROTO_ICMPV6, net); 3147 if (err < 0) { 3148 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", 3149 err); 3150 goto out_sock_create; 3151 } 3152 3153 err = igmp6_proc_init(net); 3154 if (err) 3155 goto out_sock_create_autojoin; 3156 3157 return 0; 3158 3159 out_sock_create_autojoin: 3160 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3161 out_sock_create: 3162 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3163 out: 3164 return err; 3165 } 3166 3167 static void __net_exit igmp6_net_exit(struct net *net) 3168 { 3169 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 3170 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); 3171 igmp6_proc_exit(net); 3172 } 3173 3174 static struct pernet_operations igmp6_net_ops = { 3175 .init = igmp6_net_init, 3176 .exit = igmp6_net_exit, 3177 }; 3178 3179 int __init igmp6_init(void) 3180 { 3181 int err; 3182 3183 err = register_pernet_subsys(&igmp6_net_ops); 3184 if (err) 3185 return err; 3186 3187 mld_wq = create_workqueue("mld"); 3188 if (!mld_wq) { 3189 unregister_pernet_subsys(&igmp6_net_ops); 3190 return -ENOMEM; 3191 } 3192 3193 return err; 3194 } 3195 3196 int __init igmp6_late_init(void) 3197 { 3198 return register_netdevice_notifier(&igmp6_netdev_notifier); 3199 } 3200 3201 void igmp6_cleanup(void) 3202 { 3203 unregister_pernet_subsys(&igmp6_net_ops); 3204 destroy_workqueue(mld_wq); 3205 } 3206 3207 void igmp6_late_cleanup(void) 3208 { 3209 unregister_netdevice_notifier(&igmp6_netdev_notifier); 3210 } 3211