1 /* 2 * Multicast support for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 /* Changes: 17 * 18 * yoshfuji : fix format of router-alert option 19 * YOSHIFUJI Hideaki @USAGI: 20 * Fixed source address for MLD message based on 21 * <draft-ietf-magma-mld-source-05.txt>. 22 * YOSHIFUJI Hideaki @USAGI: 23 * - Ignore Queries for invalid addresses. 24 * - MLD for link-local addresses. 25 * David L Stevens <dlstevens@us.ibm.com>: 26 * - MLDv2 support 27 */ 28 29 #include <linux/module.h> 30 #include <linux/errno.h> 31 #include <linux/types.h> 32 #include <linux/string.h> 33 #include <linux/socket.h> 34 #include <linux/sockios.h> 35 #include <linux/jiffies.h> 36 #include <linux/times.h> 37 #include <linux/net.h> 38 #include <linux/in.h> 39 #include <linux/in6.h> 40 #include <linux/netdevice.h> 41 #include <linux/if_arp.h> 42 #include <linux/route.h> 43 #include <linux/init.h> 44 #include <linux/proc_fs.h> 45 #include <linux/seq_file.h> 46 #include <linux/slab.h> 47 #include <net/mld.h> 48 49 #include <linux/netfilter.h> 50 #include <linux/netfilter_ipv6.h> 51 52 #include <net/net_namespace.h> 53 #include <net/sock.h> 54 #include <net/snmp.h> 55 56 #include <net/ipv6.h> 57 #include <net/protocol.h> 58 #include <net/if_inet6.h> 59 #include <net/ndisc.h> 60 #include <net/addrconf.h> 61 #include <net/ip6_route.h> 62 #include <net/inet_common.h> 63 64 #include <net/ip6_checksum.h> 65 66 /* Set to 3 to get tracing... */ 67 #define MCAST_DEBUG 2 68 69 #if MCAST_DEBUG >= 3 70 #define MDBG(x) printk x 71 #else 72 #define MDBG(x) 73 #endif 74 75 /* Ensure that we have struct in6_addr aligned on 32bit word. */ 76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = { 77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4), 78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4), 79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4) 80 }; 81 82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 83 84 /* Big mc list lock for all the sockets */ 85 static DEFINE_RWLOCK(ipv6_sk_mc_lock); 86 87 static void igmp6_join_group(struct ifmcaddr6 *ma); 88 static void igmp6_leave_group(struct ifmcaddr6 *ma); 89 static void igmp6_timer_handler(unsigned long data); 90 91 static void mld_gq_timer_expire(unsigned long data); 92 static void mld_ifc_timer_expire(unsigned long data); 93 static void mld_ifc_event(struct inet6_dev *idev); 94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 95 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 96 static void mld_clear_delrec(struct inet6_dev *idev); 97 static int sf_setstate(struct ifmcaddr6 *pmc); 98 static void sf_markstate(struct ifmcaddr6 *pmc); 99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 100 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 101 int sfmode, int sfcount, struct in6_addr *psfsrc, 102 int delta); 103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 104 int sfmode, int sfcount, struct in6_addr *psfsrc, 105 int delta); 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 107 struct inet6_dev *idev); 108 109 110 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 111 #define MLD_QRV_DEFAULT 2 112 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \ 114 (idev)->cnf.force_mld_version == 1 || \ 115 ((idev)->mc_v1_seen && \ 116 time_before(jiffies, (idev)->mc_v1_seen))) 117 118 #define IPV6_MLD_MAX_MSF 64 119 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 121 122 /* 123 * socket join on multicast group 124 */ 125 126 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 127 { 128 struct net_device *dev = NULL; 129 struct ipv6_mc_socklist *mc_lst; 130 struct ipv6_pinfo *np = inet6_sk(sk); 131 struct net *net = sock_net(sk); 132 int err; 133 134 if (!ipv6_addr_is_multicast(addr)) 135 return -EINVAL; 136 137 read_lock_bh(&ipv6_sk_mc_lock); 138 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 139 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 140 ipv6_addr_equal(&mc_lst->addr, addr)) { 141 read_unlock_bh(&ipv6_sk_mc_lock); 142 return -EADDRINUSE; 143 } 144 } 145 read_unlock_bh(&ipv6_sk_mc_lock); 146 147 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 148 149 if (mc_lst == NULL) 150 return -ENOMEM; 151 152 mc_lst->next = NULL; 153 ipv6_addr_copy(&mc_lst->addr, addr); 154 155 if (ifindex == 0) { 156 struct rt6_info *rt; 157 rt = rt6_lookup(net, addr, NULL, 0, 0); 158 if (rt) { 159 dev = rt->rt6i_dev; 160 dev_hold(dev); 161 dst_release(&rt->u.dst); 162 } 163 } else 164 dev = dev_get_by_index(net, ifindex); 165 166 if (dev == NULL) { 167 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 168 return -ENODEV; 169 } 170 171 mc_lst->ifindex = dev->ifindex; 172 mc_lst->sfmode = MCAST_EXCLUDE; 173 rwlock_init(&mc_lst->sflock); 174 mc_lst->sflist = NULL; 175 176 /* 177 * now add/increase the group membership on the device 178 */ 179 180 err = ipv6_dev_mc_inc(dev, addr); 181 182 if (err) { 183 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 184 dev_put(dev); 185 return err; 186 } 187 188 write_lock_bh(&ipv6_sk_mc_lock); 189 mc_lst->next = np->ipv6_mc_list; 190 np->ipv6_mc_list = mc_lst; 191 write_unlock_bh(&ipv6_sk_mc_lock); 192 193 dev_put(dev); 194 195 return 0; 196 } 197 198 /* 199 * socket leave on multicast group 200 */ 201 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 202 { 203 struct ipv6_pinfo *np = inet6_sk(sk); 204 struct ipv6_mc_socklist *mc_lst, **lnk; 205 struct net *net = sock_net(sk); 206 207 write_lock_bh(&ipv6_sk_mc_lock); 208 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { 209 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 210 ipv6_addr_equal(&mc_lst->addr, addr)) { 211 struct net_device *dev; 212 213 *lnk = mc_lst->next; 214 write_unlock_bh(&ipv6_sk_mc_lock); 215 216 dev = dev_get_by_index(net, mc_lst->ifindex); 217 if (dev != NULL) { 218 struct inet6_dev *idev = in6_dev_get(dev); 219 220 (void) ip6_mc_leave_src(sk, mc_lst, idev); 221 if (idev) { 222 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 223 in6_dev_put(idev); 224 } 225 dev_put(dev); 226 } else 227 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 228 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 229 return 0; 230 } 231 } 232 write_unlock_bh(&ipv6_sk_mc_lock); 233 234 return -EADDRNOTAVAIL; 235 } 236 237 static struct inet6_dev *ip6_mc_find_dev(struct net *net, 238 struct in6_addr *group, 239 int ifindex) 240 { 241 struct net_device *dev = NULL; 242 struct inet6_dev *idev = NULL; 243 244 if (ifindex == 0) { 245 struct rt6_info *rt; 246 247 rt = rt6_lookup(net, group, NULL, 0, 0); 248 if (rt) { 249 dev = rt->rt6i_dev; 250 dev_hold(dev); 251 dst_release(&rt->u.dst); 252 } 253 } else 254 dev = dev_get_by_index(net, ifindex); 255 256 if (!dev) 257 goto nodev; 258 idev = in6_dev_get(dev); 259 if (!idev) 260 goto release; 261 read_lock_bh(&idev->lock); 262 if (idev->dead) 263 goto unlock_release; 264 265 return idev; 266 267 unlock_release: 268 read_unlock_bh(&idev->lock); 269 in6_dev_put(idev); 270 release: 271 dev_put(dev); 272 nodev: 273 return NULL; 274 } 275 276 void ipv6_sock_mc_close(struct sock *sk) 277 { 278 struct ipv6_pinfo *np = inet6_sk(sk); 279 struct ipv6_mc_socklist *mc_lst; 280 struct net *net = sock_net(sk); 281 282 write_lock_bh(&ipv6_sk_mc_lock); 283 while ((mc_lst = np->ipv6_mc_list) != NULL) { 284 struct net_device *dev; 285 286 np->ipv6_mc_list = mc_lst->next; 287 write_unlock_bh(&ipv6_sk_mc_lock); 288 289 dev = dev_get_by_index(net, mc_lst->ifindex); 290 if (dev) { 291 struct inet6_dev *idev = in6_dev_get(dev); 292 293 (void) ip6_mc_leave_src(sk, mc_lst, idev); 294 if (idev) { 295 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 296 in6_dev_put(idev); 297 } 298 dev_put(dev); 299 } else 300 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 301 302 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 303 304 write_lock_bh(&ipv6_sk_mc_lock); 305 } 306 write_unlock_bh(&ipv6_sk_mc_lock); 307 } 308 309 int ip6_mc_source(int add, int omode, struct sock *sk, 310 struct group_source_req *pgsr) 311 { 312 struct in6_addr *source, *group; 313 struct ipv6_mc_socklist *pmc; 314 struct net_device *dev; 315 struct inet6_dev *idev; 316 struct ipv6_pinfo *inet6 = inet6_sk(sk); 317 struct ip6_sf_socklist *psl; 318 struct net *net = sock_net(sk); 319 int i, j, rv; 320 int leavegroup = 0; 321 int pmclocked = 0; 322 int err; 323 324 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 325 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 326 327 if (!ipv6_addr_is_multicast(group)) 328 return -EINVAL; 329 330 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface); 331 if (!idev) 332 return -ENODEV; 333 dev = idev->dev; 334 335 err = -EADDRNOTAVAIL; 336 337 read_lock_bh(&ipv6_sk_mc_lock); 338 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 339 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 340 continue; 341 if (ipv6_addr_equal(&pmc->addr, group)) 342 break; 343 } 344 if (!pmc) { /* must have a prior join */ 345 err = -EINVAL; 346 goto done; 347 } 348 /* if a source filter was set, must be the same mode as before */ 349 if (pmc->sflist) { 350 if (pmc->sfmode != omode) { 351 err = -EINVAL; 352 goto done; 353 } 354 } else if (pmc->sfmode != omode) { 355 /* allow mode switches for empty-set filters */ 356 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 357 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 358 pmc->sfmode = omode; 359 } 360 361 write_lock_bh(&pmc->sflock); 362 pmclocked = 1; 363 364 psl = pmc->sflist; 365 if (!add) { 366 if (!psl) 367 goto done; /* err = -EADDRNOTAVAIL */ 368 rv = !0; 369 for (i=0; i<psl->sl_count; i++) { 370 rv = memcmp(&psl->sl_addr[i], source, 371 sizeof(struct in6_addr)); 372 if (rv == 0) 373 break; 374 } 375 if (rv) /* source not found */ 376 goto done; /* err = -EADDRNOTAVAIL */ 377 378 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 379 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 380 leavegroup = 1; 381 goto done; 382 } 383 384 /* update the interface filter */ 385 ip6_mc_del_src(idev, group, omode, 1, source, 1); 386 387 for (j=i+1; j<psl->sl_count; j++) 388 psl->sl_addr[j-1] = psl->sl_addr[j]; 389 psl->sl_count--; 390 err = 0; 391 goto done; 392 } 393 /* else, add a new source to the filter */ 394 395 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 396 err = -ENOBUFS; 397 goto done; 398 } 399 if (!psl || psl->sl_count == psl->sl_max) { 400 struct ip6_sf_socklist *newpsl; 401 int count = IP6_SFBLOCK; 402 403 if (psl) 404 count += psl->sl_max; 405 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 406 if (!newpsl) { 407 err = -ENOBUFS; 408 goto done; 409 } 410 newpsl->sl_max = count; 411 newpsl->sl_count = count - IP6_SFBLOCK; 412 if (psl) { 413 for (i=0; i<psl->sl_count; i++) 414 newpsl->sl_addr[i] = psl->sl_addr[i]; 415 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 416 } 417 pmc->sflist = psl = newpsl; 418 } 419 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 420 for (i=0; i<psl->sl_count; i++) { 421 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 422 if (rv == 0) 423 break; 424 } 425 if (rv == 0) /* address already there is an error */ 426 goto done; 427 for (j=psl->sl_count-1; j>=i; j--) 428 psl->sl_addr[j+1] = psl->sl_addr[j]; 429 psl->sl_addr[i] = *source; 430 psl->sl_count++; 431 err = 0; 432 /* update the interface list */ 433 ip6_mc_add_src(idev, group, omode, 1, source, 1); 434 done: 435 if (pmclocked) 436 write_unlock_bh(&pmc->sflock); 437 read_unlock_bh(&ipv6_sk_mc_lock); 438 read_unlock_bh(&idev->lock); 439 in6_dev_put(idev); 440 dev_put(dev); 441 if (leavegroup) 442 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 443 return err; 444 } 445 446 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 447 { 448 struct in6_addr *group; 449 struct ipv6_mc_socklist *pmc; 450 struct net_device *dev; 451 struct inet6_dev *idev; 452 struct ipv6_pinfo *inet6 = inet6_sk(sk); 453 struct ip6_sf_socklist *newpsl, *psl; 454 struct net *net = sock_net(sk); 455 int leavegroup = 0; 456 int i, err; 457 458 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 459 460 if (!ipv6_addr_is_multicast(group)) 461 return -EINVAL; 462 if (gsf->gf_fmode != MCAST_INCLUDE && 463 gsf->gf_fmode != MCAST_EXCLUDE) 464 return -EINVAL; 465 466 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 467 468 if (!idev) 469 return -ENODEV; 470 dev = idev->dev; 471 472 err = 0; 473 read_lock_bh(&ipv6_sk_mc_lock); 474 475 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 476 leavegroup = 1; 477 goto done; 478 } 479 480 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 481 if (pmc->ifindex != gsf->gf_interface) 482 continue; 483 if (ipv6_addr_equal(&pmc->addr, group)) 484 break; 485 } 486 if (!pmc) { /* must have a prior join */ 487 err = -EINVAL; 488 goto done; 489 } 490 if (gsf->gf_numsrc) { 491 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 492 GFP_ATOMIC); 493 if (!newpsl) { 494 err = -ENOBUFS; 495 goto done; 496 } 497 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 498 for (i=0; i<newpsl->sl_count; ++i) { 499 struct sockaddr_in6 *psin6; 500 501 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 502 newpsl->sl_addr[i] = psin6->sin6_addr; 503 } 504 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 505 newpsl->sl_count, newpsl->sl_addr, 0); 506 if (err) { 507 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 508 goto done; 509 } 510 } else { 511 newpsl = NULL; 512 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 513 } 514 515 write_lock_bh(&pmc->sflock); 516 psl = pmc->sflist; 517 if (psl) { 518 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 519 psl->sl_count, psl->sl_addr, 0); 520 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 521 } else 522 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 523 pmc->sflist = newpsl; 524 pmc->sfmode = gsf->gf_fmode; 525 write_unlock_bh(&pmc->sflock); 526 err = 0; 527 done: 528 read_unlock_bh(&ipv6_sk_mc_lock); 529 read_unlock_bh(&idev->lock); 530 in6_dev_put(idev); 531 dev_put(dev); 532 if (leavegroup) 533 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 534 return err; 535 } 536 537 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 538 struct group_filter __user *optval, int __user *optlen) 539 { 540 int err, i, count, copycount; 541 struct in6_addr *group; 542 struct ipv6_mc_socklist *pmc; 543 struct inet6_dev *idev; 544 struct net_device *dev; 545 struct ipv6_pinfo *inet6 = inet6_sk(sk); 546 struct ip6_sf_socklist *psl; 547 struct net *net = sock_net(sk); 548 549 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 550 551 if (!ipv6_addr_is_multicast(group)) 552 return -EINVAL; 553 554 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 555 556 if (!idev) 557 return -ENODEV; 558 559 dev = idev->dev; 560 561 err = -EADDRNOTAVAIL; 562 /* 563 * changes to the ipv6_mc_list require the socket lock and 564 * a read lock on ip6_sk_mc_lock. We have the socket lock, 565 * so reading the list is safe. 566 */ 567 568 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 569 if (pmc->ifindex != gsf->gf_interface) 570 continue; 571 if (ipv6_addr_equal(group, &pmc->addr)) 572 break; 573 } 574 if (!pmc) /* must have a prior join */ 575 goto done; 576 gsf->gf_fmode = pmc->sfmode; 577 psl = pmc->sflist; 578 count = psl ? psl->sl_count : 0; 579 read_unlock_bh(&idev->lock); 580 in6_dev_put(idev); 581 dev_put(dev); 582 583 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 584 gsf->gf_numsrc = count; 585 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 586 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 587 return -EFAULT; 588 } 589 /* changes to psl require the socket lock, a read lock on 590 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 591 * have the socket lock, so reading here is safe. 592 */ 593 for (i=0; i<copycount; i++) { 594 struct sockaddr_in6 *psin6; 595 struct sockaddr_storage ss; 596 597 psin6 = (struct sockaddr_in6 *)&ss; 598 memset(&ss, 0, sizeof(ss)); 599 psin6->sin6_family = AF_INET6; 600 psin6->sin6_addr = psl->sl_addr[i]; 601 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 602 return -EFAULT; 603 } 604 return 0; 605 done: 606 read_unlock_bh(&idev->lock); 607 in6_dev_put(idev); 608 dev_put(dev); 609 return err; 610 } 611 612 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 613 const struct in6_addr *src_addr) 614 { 615 struct ipv6_pinfo *np = inet6_sk(sk); 616 struct ipv6_mc_socklist *mc; 617 struct ip6_sf_socklist *psl; 618 int rv = 1; 619 620 read_lock(&ipv6_sk_mc_lock); 621 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 622 if (ipv6_addr_equal(&mc->addr, mc_addr)) 623 break; 624 } 625 if (!mc) { 626 read_unlock(&ipv6_sk_mc_lock); 627 return 1; 628 } 629 read_lock(&mc->sflock); 630 psl = mc->sflist; 631 if (!psl) { 632 rv = mc->sfmode == MCAST_EXCLUDE; 633 } else { 634 int i; 635 636 for (i=0; i<psl->sl_count; i++) { 637 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 638 break; 639 } 640 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 641 rv = 0; 642 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 643 rv = 0; 644 } 645 read_unlock(&mc->sflock); 646 read_unlock(&ipv6_sk_mc_lock); 647 648 return rv; 649 } 650 651 static void ma_put(struct ifmcaddr6 *mc) 652 { 653 if (atomic_dec_and_test(&mc->mca_refcnt)) { 654 in6_dev_put(mc->idev); 655 kfree(mc); 656 } 657 } 658 659 static void igmp6_group_added(struct ifmcaddr6 *mc) 660 { 661 struct net_device *dev = mc->idev->dev; 662 char buf[MAX_ADDR_LEN]; 663 664 spin_lock_bh(&mc->mca_lock); 665 if (!(mc->mca_flags&MAF_LOADED)) { 666 mc->mca_flags |= MAF_LOADED; 667 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 668 dev_mc_add(dev, buf); 669 } 670 spin_unlock_bh(&mc->mca_lock); 671 672 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 673 return; 674 675 if (MLD_V1_SEEN(mc->idev)) { 676 igmp6_join_group(mc); 677 return; 678 } 679 /* else v2 */ 680 681 mc->mca_crcount = mc->idev->mc_qrv; 682 mld_ifc_event(mc->idev); 683 } 684 685 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 686 { 687 struct net_device *dev = mc->idev->dev; 688 char buf[MAX_ADDR_LEN]; 689 690 spin_lock_bh(&mc->mca_lock); 691 if (mc->mca_flags&MAF_LOADED) { 692 mc->mca_flags &= ~MAF_LOADED; 693 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 694 dev_mc_del(dev, buf); 695 } 696 697 if (mc->mca_flags & MAF_NOREPORT) 698 goto done; 699 spin_unlock_bh(&mc->mca_lock); 700 701 if (!mc->idev->dead) 702 igmp6_leave_group(mc); 703 704 spin_lock_bh(&mc->mca_lock); 705 if (del_timer(&mc->mca_timer)) 706 atomic_dec(&mc->mca_refcnt); 707 done: 708 ip6_mc_clear_src(mc); 709 spin_unlock_bh(&mc->mca_lock); 710 } 711 712 /* 713 * deleted ifmcaddr6 manipulation 714 */ 715 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 716 { 717 struct ifmcaddr6 *pmc; 718 719 /* this is an "ifmcaddr6" for convenience; only the fields below 720 * are actually used. In particular, the refcnt and users are not 721 * used for management of the delete list. Using the same structure 722 * for deleted items allows change reports to use common code with 723 * non-deleted or query-response MCA's. 724 */ 725 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 726 if (!pmc) 727 return; 728 729 spin_lock_bh(&im->mca_lock); 730 spin_lock_init(&pmc->mca_lock); 731 pmc->idev = im->idev; 732 in6_dev_hold(idev); 733 pmc->mca_addr = im->mca_addr; 734 pmc->mca_crcount = idev->mc_qrv; 735 pmc->mca_sfmode = im->mca_sfmode; 736 if (pmc->mca_sfmode == MCAST_INCLUDE) { 737 struct ip6_sf_list *psf; 738 739 pmc->mca_tomb = im->mca_tomb; 740 pmc->mca_sources = im->mca_sources; 741 im->mca_tomb = im->mca_sources = NULL; 742 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 743 psf->sf_crcount = pmc->mca_crcount; 744 } 745 spin_unlock_bh(&im->mca_lock); 746 747 spin_lock_bh(&idev->mc_lock); 748 pmc->next = idev->mc_tomb; 749 idev->mc_tomb = pmc; 750 spin_unlock_bh(&idev->mc_lock); 751 } 752 753 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 754 { 755 struct ifmcaddr6 *pmc, *pmc_prev; 756 struct ip6_sf_list *psf, *psf_next; 757 758 spin_lock_bh(&idev->mc_lock); 759 pmc_prev = NULL; 760 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 761 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 762 break; 763 pmc_prev = pmc; 764 } 765 if (pmc) { 766 if (pmc_prev) 767 pmc_prev->next = pmc->next; 768 else 769 idev->mc_tomb = pmc->next; 770 } 771 spin_unlock_bh(&idev->mc_lock); 772 773 if (pmc) { 774 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 775 psf_next = psf->sf_next; 776 kfree(psf); 777 } 778 in6_dev_put(pmc->idev); 779 kfree(pmc); 780 } 781 } 782 783 static void mld_clear_delrec(struct inet6_dev *idev) 784 { 785 struct ifmcaddr6 *pmc, *nextpmc; 786 787 spin_lock_bh(&idev->mc_lock); 788 pmc = idev->mc_tomb; 789 idev->mc_tomb = NULL; 790 spin_unlock_bh(&idev->mc_lock); 791 792 for (; pmc; pmc = nextpmc) { 793 nextpmc = pmc->next; 794 ip6_mc_clear_src(pmc); 795 in6_dev_put(pmc->idev); 796 kfree(pmc); 797 } 798 799 /* clear dead sources, too */ 800 read_lock_bh(&idev->lock); 801 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 802 struct ip6_sf_list *psf, *psf_next; 803 804 spin_lock_bh(&pmc->mca_lock); 805 psf = pmc->mca_tomb; 806 pmc->mca_tomb = NULL; 807 spin_unlock_bh(&pmc->mca_lock); 808 for (; psf; psf=psf_next) { 809 psf_next = psf->sf_next; 810 kfree(psf); 811 } 812 } 813 read_unlock_bh(&idev->lock); 814 } 815 816 817 /* 818 * device multicast group inc (add if not found) 819 */ 820 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 821 { 822 struct ifmcaddr6 *mc; 823 struct inet6_dev *idev; 824 825 idev = in6_dev_get(dev); 826 827 if (idev == NULL) 828 return -EINVAL; 829 830 write_lock_bh(&idev->lock); 831 if (idev->dead) { 832 write_unlock_bh(&idev->lock); 833 in6_dev_put(idev); 834 return -ENODEV; 835 } 836 837 for (mc = idev->mc_list; mc; mc = mc->next) { 838 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 839 mc->mca_users++; 840 write_unlock_bh(&idev->lock); 841 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 842 NULL, 0); 843 in6_dev_put(idev); 844 return 0; 845 } 846 } 847 848 /* 849 * not found: create a new one. 850 */ 851 852 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 853 854 if (mc == NULL) { 855 write_unlock_bh(&idev->lock); 856 in6_dev_put(idev); 857 return -ENOMEM; 858 } 859 860 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 861 862 ipv6_addr_copy(&mc->mca_addr, addr); 863 mc->idev = idev; 864 mc->mca_users = 1; 865 /* mca_stamp should be updated upon changes */ 866 mc->mca_cstamp = mc->mca_tstamp = jiffies; 867 atomic_set(&mc->mca_refcnt, 2); 868 spin_lock_init(&mc->mca_lock); 869 870 /* initial mode is (EX, empty) */ 871 mc->mca_sfmode = MCAST_EXCLUDE; 872 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 873 874 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 875 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 876 mc->mca_flags |= MAF_NOREPORT; 877 878 mc->next = idev->mc_list; 879 idev->mc_list = mc; 880 write_unlock_bh(&idev->lock); 881 882 mld_del_delrec(idev, &mc->mca_addr); 883 igmp6_group_added(mc); 884 ma_put(mc); 885 return 0; 886 } 887 888 /* 889 * device multicast group del 890 */ 891 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 892 { 893 struct ifmcaddr6 *ma, **map; 894 895 write_lock_bh(&idev->lock); 896 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 897 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 898 if (--ma->mca_users == 0) { 899 *map = ma->next; 900 write_unlock_bh(&idev->lock); 901 902 igmp6_group_dropped(ma); 903 904 ma_put(ma); 905 return 0; 906 } 907 write_unlock_bh(&idev->lock); 908 return 0; 909 } 910 } 911 write_unlock_bh(&idev->lock); 912 913 return -ENOENT; 914 } 915 916 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 917 { 918 struct inet6_dev *idev = in6_dev_get(dev); 919 int err; 920 921 if (!idev) 922 return -ENODEV; 923 924 err = __ipv6_dev_mc_dec(idev, addr); 925 926 in6_dev_put(idev); 927 928 return err; 929 } 930 931 /* 932 * identify MLD packets for MLD filter exceptions 933 */ 934 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 935 { 936 struct icmp6hdr *pic; 937 938 if (nexthdr != IPPROTO_ICMPV6) 939 return 0; 940 941 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 942 return 0; 943 944 pic = icmp6_hdr(skb); 945 946 switch (pic->icmp6_type) { 947 case ICMPV6_MGM_QUERY: 948 case ICMPV6_MGM_REPORT: 949 case ICMPV6_MGM_REDUCTION: 950 case ICMPV6_MLD2_REPORT: 951 return 1; 952 default: 953 break; 954 } 955 return 0; 956 } 957 958 /* 959 * check if the interface/address pair is valid 960 */ 961 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 962 const struct in6_addr *src_addr) 963 { 964 struct inet6_dev *idev; 965 struct ifmcaddr6 *mc; 966 int rv = 0; 967 968 idev = in6_dev_get(dev); 969 if (idev) { 970 read_lock_bh(&idev->lock); 971 for (mc = idev->mc_list; mc; mc=mc->next) { 972 if (ipv6_addr_equal(&mc->mca_addr, group)) 973 break; 974 } 975 if (mc) { 976 if (src_addr && !ipv6_addr_any(src_addr)) { 977 struct ip6_sf_list *psf; 978 979 spin_lock_bh(&mc->mca_lock); 980 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 981 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 982 break; 983 } 984 if (psf) 985 rv = psf->sf_count[MCAST_INCLUDE] || 986 psf->sf_count[MCAST_EXCLUDE] != 987 mc->mca_sfcount[MCAST_EXCLUDE]; 988 else 989 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 990 spin_unlock_bh(&mc->mca_lock); 991 } else 992 rv = 1; /* don't filter unspecified source */ 993 } 994 read_unlock_bh(&idev->lock); 995 in6_dev_put(idev); 996 } 997 return rv; 998 } 999 1000 static void mld_gq_start_timer(struct inet6_dev *idev) 1001 { 1002 int tv = net_random() % idev->mc_maxdelay; 1003 1004 idev->mc_gq_running = 1; 1005 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1006 in6_dev_hold(idev); 1007 } 1008 1009 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1010 { 1011 int tv = net_random() % delay; 1012 1013 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1014 in6_dev_hold(idev); 1015 } 1016 1017 /* 1018 * IGMP handling (alias multicast ICMPv6 messages) 1019 */ 1020 1021 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1022 { 1023 unsigned long delay = resptime; 1024 1025 /* Do not start timer for these addresses */ 1026 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1027 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1028 return; 1029 1030 if (del_timer(&ma->mca_timer)) { 1031 atomic_dec(&ma->mca_refcnt); 1032 delay = ma->mca_timer.expires - jiffies; 1033 } 1034 1035 if (delay >= resptime) { 1036 if (resptime) 1037 delay = net_random() % resptime; 1038 else 1039 delay = 1; 1040 } 1041 ma->mca_timer.expires = jiffies + delay; 1042 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1043 atomic_inc(&ma->mca_refcnt); 1044 ma->mca_flags |= MAF_TIMER_RUNNING; 1045 } 1046 1047 /* mark EXCLUDE-mode sources */ 1048 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1049 struct in6_addr *srcs) 1050 { 1051 struct ip6_sf_list *psf; 1052 int i, scount; 1053 1054 scount = 0; 1055 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1056 if (scount == nsrcs) 1057 break; 1058 for (i=0; i<nsrcs; i++) { 1059 /* skip inactive filters */ 1060 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1061 pmc->mca_sfcount[MCAST_EXCLUDE] != 1062 psf->sf_count[MCAST_EXCLUDE]) 1063 continue; 1064 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1065 scount++; 1066 break; 1067 } 1068 } 1069 } 1070 pmc->mca_flags &= ~MAF_GSQUERY; 1071 if (scount == nsrcs) /* all sources excluded */ 1072 return 0; 1073 return 1; 1074 } 1075 1076 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1077 struct in6_addr *srcs) 1078 { 1079 struct ip6_sf_list *psf; 1080 int i, scount; 1081 1082 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1083 return mld_xmarksources(pmc, nsrcs, srcs); 1084 1085 /* mark INCLUDE-mode sources */ 1086 1087 scount = 0; 1088 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1089 if (scount == nsrcs) 1090 break; 1091 for (i=0; i<nsrcs; i++) { 1092 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1093 psf->sf_gsresp = 1; 1094 scount++; 1095 break; 1096 } 1097 } 1098 } 1099 if (!scount) { 1100 pmc->mca_flags &= ~MAF_GSQUERY; 1101 return 0; 1102 } 1103 pmc->mca_flags |= MAF_GSQUERY; 1104 return 1; 1105 } 1106 1107 int igmp6_event_query(struct sk_buff *skb) 1108 { 1109 struct mld2_query *mlh2 = NULL; 1110 struct ifmcaddr6 *ma; 1111 struct in6_addr *group; 1112 unsigned long max_delay; 1113 struct inet6_dev *idev; 1114 struct mld_msg *mld; 1115 int group_type; 1116 int mark = 0; 1117 int len; 1118 1119 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1120 return -EINVAL; 1121 1122 /* compute payload length excluding extension headers */ 1123 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1124 len -= skb_network_header_len(skb); 1125 1126 /* Drop queries with not link local source */ 1127 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1128 return -EINVAL; 1129 1130 idev = in6_dev_get(skb->dev); 1131 1132 if (idev == NULL) 1133 return 0; 1134 1135 mld = (struct mld_msg *)icmp6_hdr(skb); 1136 group = &mld->mld_mca; 1137 group_type = ipv6_addr_type(group); 1138 1139 if (group_type != IPV6_ADDR_ANY && 1140 !(group_type&IPV6_ADDR_MULTICAST)) { 1141 in6_dev_put(idev); 1142 return -EINVAL; 1143 } 1144 1145 if (len == 24) { 1146 int switchback; 1147 /* MLDv1 router present */ 1148 1149 /* Translate milliseconds to jiffies */ 1150 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000; 1151 1152 switchback = (idev->mc_qrv + 1) * max_delay; 1153 idev->mc_v1_seen = jiffies + switchback; 1154 1155 /* cancel the interface change timer */ 1156 idev->mc_ifc_count = 0; 1157 if (del_timer(&idev->mc_ifc_timer)) 1158 __in6_dev_put(idev); 1159 /* clear deleted report items */ 1160 mld_clear_delrec(idev); 1161 } else if (len >= 28) { 1162 int srcs_offset = sizeof(struct mld2_query) - 1163 sizeof(struct icmp6hdr); 1164 if (!pskb_may_pull(skb, srcs_offset)) { 1165 in6_dev_put(idev); 1166 return -EINVAL; 1167 } 1168 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1169 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000; 1170 if (!max_delay) 1171 max_delay = 1; 1172 idev->mc_maxdelay = max_delay; 1173 if (mlh2->mld2q_qrv) 1174 idev->mc_qrv = mlh2->mld2q_qrv; 1175 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1176 if (mlh2->mld2q_nsrcs) { 1177 in6_dev_put(idev); 1178 return -EINVAL; /* no sources allowed */ 1179 } 1180 mld_gq_start_timer(idev); 1181 in6_dev_put(idev); 1182 return 0; 1183 } 1184 /* mark sources to include, if group & source-specific */ 1185 if (mlh2->mld2q_nsrcs != 0) { 1186 if (!pskb_may_pull(skb, srcs_offset + 1187 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) { 1188 in6_dev_put(idev); 1189 return -EINVAL; 1190 } 1191 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1192 mark = 1; 1193 } 1194 } else { 1195 in6_dev_put(idev); 1196 return -EINVAL; 1197 } 1198 1199 read_lock_bh(&idev->lock); 1200 if (group_type == IPV6_ADDR_ANY) { 1201 for (ma = idev->mc_list; ma; ma=ma->next) { 1202 spin_lock_bh(&ma->mca_lock); 1203 igmp6_group_queried(ma, max_delay); 1204 spin_unlock_bh(&ma->mca_lock); 1205 } 1206 } else { 1207 for (ma = idev->mc_list; ma; ma=ma->next) { 1208 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1209 continue; 1210 spin_lock_bh(&ma->mca_lock); 1211 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1212 /* gsquery <- gsquery && mark */ 1213 if (!mark) 1214 ma->mca_flags &= ~MAF_GSQUERY; 1215 } else { 1216 /* gsquery <- mark */ 1217 if (mark) 1218 ma->mca_flags |= MAF_GSQUERY; 1219 else 1220 ma->mca_flags &= ~MAF_GSQUERY; 1221 } 1222 if (!(ma->mca_flags & MAF_GSQUERY) || 1223 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) 1224 igmp6_group_queried(ma, max_delay); 1225 spin_unlock_bh(&ma->mca_lock); 1226 break; 1227 } 1228 } 1229 read_unlock_bh(&idev->lock); 1230 in6_dev_put(idev); 1231 1232 return 0; 1233 } 1234 1235 1236 int igmp6_event_report(struct sk_buff *skb) 1237 { 1238 struct ifmcaddr6 *ma; 1239 struct inet6_dev *idev; 1240 struct mld_msg *mld; 1241 int addr_type; 1242 1243 /* Our own report looped back. Ignore it. */ 1244 if (skb->pkt_type == PACKET_LOOPBACK) 1245 return 0; 1246 1247 /* send our report if the MC router may not have heard this report */ 1248 if (skb->pkt_type != PACKET_MULTICAST && 1249 skb->pkt_type != PACKET_BROADCAST) 1250 return 0; 1251 1252 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) 1253 return -EINVAL; 1254 1255 mld = (struct mld_msg *)icmp6_hdr(skb); 1256 1257 /* Drop reports with not link local source */ 1258 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1259 if (addr_type != IPV6_ADDR_ANY && 1260 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1261 return -EINVAL; 1262 1263 idev = in6_dev_get(skb->dev); 1264 if (idev == NULL) 1265 return -ENODEV; 1266 1267 /* 1268 * Cancel the timer for this group 1269 */ 1270 1271 read_lock_bh(&idev->lock); 1272 for (ma = idev->mc_list; ma; ma=ma->next) { 1273 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { 1274 spin_lock(&ma->mca_lock); 1275 if (del_timer(&ma->mca_timer)) 1276 atomic_dec(&ma->mca_refcnt); 1277 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1278 spin_unlock(&ma->mca_lock); 1279 break; 1280 } 1281 } 1282 read_unlock_bh(&idev->lock); 1283 in6_dev_put(idev); 1284 return 0; 1285 } 1286 1287 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1288 int gdeleted, int sdeleted) 1289 { 1290 switch (type) { 1291 case MLD2_MODE_IS_INCLUDE: 1292 case MLD2_MODE_IS_EXCLUDE: 1293 if (gdeleted || sdeleted) 1294 return 0; 1295 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1296 if (pmc->mca_sfmode == MCAST_INCLUDE) 1297 return 1; 1298 /* don't include if this source is excluded 1299 * in all filters 1300 */ 1301 if (psf->sf_count[MCAST_INCLUDE]) 1302 return type == MLD2_MODE_IS_INCLUDE; 1303 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1304 psf->sf_count[MCAST_EXCLUDE]; 1305 } 1306 return 0; 1307 case MLD2_CHANGE_TO_INCLUDE: 1308 if (gdeleted || sdeleted) 1309 return 0; 1310 return psf->sf_count[MCAST_INCLUDE] != 0; 1311 case MLD2_CHANGE_TO_EXCLUDE: 1312 if (gdeleted || sdeleted) 1313 return 0; 1314 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1315 psf->sf_count[MCAST_INCLUDE]) 1316 return 0; 1317 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1318 psf->sf_count[MCAST_EXCLUDE]; 1319 case MLD2_ALLOW_NEW_SOURCES: 1320 if (gdeleted || !psf->sf_crcount) 1321 return 0; 1322 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1323 case MLD2_BLOCK_OLD_SOURCES: 1324 if (pmc->mca_sfmode == MCAST_INCLUDE) 1325 return gdeleted || (psf->sf_crcount && sdeleted); 1326 return psf->sf_crcount && !gdeleted && !sdeleted; 1327 } 1328 return 0; 1329 } 1330 1331 static int 1332 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1333 { 1334 struct ip6_sf_list *psf; 1335 int scount = 0; 1336 1337 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1338 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1339 continue; 1340 scount++; 1341 } 1342 return scount; 1343 } 1344 1345 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1346 { 1347 struct net *net = dev_net(dev); 1348 struct sock *sk = net->ipv6.igmp_sk; 1349 struct sk_buff *skb; 1350 struct mld2_report *pmr; 1351 struct in6_addr addr_buf; 1352 const struct in6_addr *saddr; 1353 int err; 1354 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1355 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1356 IPV6_TLV_PADN, 0 }; 1357 1358 /* we assume size > sizeof(ra) here */ 1359 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err); 1360 1361 if (!skb) 1362 return NULL; 1363 1364 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1365 1366 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1367 /* <draft-ietf-magma-mld-source-05.txt>: 1368 * use unspecified address as the source address 1369 * when a valid link-local address is not available. 1370 */ 1371 saddr = &in6addr_any; 1372 } else 1373 saddr = &addr_buf; 1374 1375 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1376 1377 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1378 1379 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1380 skb_put(skb, sizeof(*pmr)); 1381 pmr = (struct mld2_report *)skb_transport_header(skb); 1382 pmr->mld2r_type = ICMPV6_MLD2_REPORT; 1383 pmr->mld2r_resv1 = 0; 1384 pmr->mld2r_cksum = 0; 1385 pmr->mld2r_resv2 = 0; 1386 pmr->mld2r_ngrec = 0; 1387 return skb; 1388 } 1389 1390 static void mld_sendpack(struct sk_buff *skb) 1391 { 1392 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1393 struct mld2_report *pmr = 1394 (struct mld2_report *)skb_transport_header(skb); 1395 int payload_len, mldlen; 1396 struct inet6_dev *idev = in6_dev_get(skb->dev); 1397 struct net *net = dev_net(skb->dev); 1398 int err; 1399 struct flowi fl; 1400 struct dst_entry *dst; 1401 1402 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1403 1404 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1405 mldlen = skb->tail - skb->transport_header; 1406 pip6->payload_len = htons(payload_len); 1407 1408 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1409 IPPROTO_ICMPV6, 1410 csum_partial(skb_transport_header(skb), 1411 mldlen, 0)); 1412 1413 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1414 1415 if (!dst) { 1416 err = -ENOMEM; 1417 goto err_out; 1418 } 1419 1420 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT, 1421 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1422 skb->dev->ifindex); 1423 1424 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1425 skb_dst_set(skb, dst); 1426 if (err) 1427 goto err_out; 1428 1429 payload_len = skb->len; 1430 1431 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1432 dst_output); 1433 out: 1434 if (!err) { 1435 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1436 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1437 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1438 } else 1439 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1440 1441 if (likely(idev != NULL)) 1442 in6_dev_put(idev); 1443 return; 1444 1445 err_out: 1446 kfree_skb(skb); 1447 goto out; 1448 } 1449 1450 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1451 { 1452 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1453 } 1454 1455 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1456 int type, struct mld2_grec **ppgr) 1457 { 1458 struct net_device *dev = pmc->idev->dev; 1459 struct mld2_report *pmr; 1460 struct mld2_grec *pgr; 1461 1462 if (!skb) 1463 skb = mld_newpack(dev, dev->mtu); 1464 if (!skb) 1465 return NULL; 1466 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1467 pgr->grec_type = type; 1468 pgr->grec_auxwords = 0; 1469 pgr->grec_nsrcs = 0; 1470 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1471 pmr = (struct mld2_report *)skb_transport_header(skb); 1472 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); 1473 *ppgr = pgr; 1474 return skb; 1475 } 1476 1477 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1478 skb_tailroom(skb)) : 0) 1479 1480 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1481 int type, int gdeleted, int sdeleted) 1482 { 1483 struct net_device *dev = pmc->idev->dev; 1484 struct mld2_report *pmr; 1485 struct mld2_grec *pgr = NULL; 1486 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1487 int scount, stotal, first, isquery, truncate; 1488 1489 if (pmc->mca_flags & MAF_NOREPORT) 1490 return skb; 1491 1492 isquery = type == MLD2_MODE_IS_INCLUDE || 1493 type == MLD2_MODE_IS_EXCLUDE; 1494 truncate = type == MLD2_MODE_IS_EXCLUDE || 1495 type == MLD2_CHANGE_TO_EXCLUDE; 1496 1497 stotal = scount = 0; 1498 1499 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1500 1501 if (!*psf_list) 1502 goto empty_source; 1503 1504 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1505 1506 /* EX and TO_EX get a fresh packet, if needed */ 1507 if (truncate) { 1508 if (pmr && pmr->mld2r_ngrec && 1509 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1510 if (skb) 1511 mld_sendpack(skb); 1512 skb = mld_newpack(dev, dev->mtu); 1513 } 1514 } 1515 first = 1; 1516 psf_prev = NULL; 1517 for (psf=*psf_list; psf; psf=psf_next) { 1518 struct in6_addr *psrc; 1519 1520 psf_next = psf->sf_next; 1521 1522 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1523 psf_prev = psf; 1524 continue; 1525 } 1526 1527 /* clear marks on query responses */ 1528 if (isquery) 1529 psf->sf_gsresp = 0; 1530 1531 if (AVAILABLE(skb) < sizeof(*psrc) + 1532 first*sizeof(struct mld2_grec)) { 1533 if (truncate && !first) 1534 break; /* truncate these */ 1535 if (pgr) 1536 pgr->grec_nsrcs = htons(scount); 1537 if (skb) 1538 mld_sendpack(skb); 1539 skb = mld_newpack(dev, dev->mtu); 1540 first = 1; 1541 scount = 0; 1542 } 1543 if (first) { 1544 skb = add_grhead(skb, pmc, type, &pgr); 1545 first = 0; 1546 } 1547 if (!skb) 1548 return NULL; 1549 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1550 *psrc = psf->sf_addr; 1551 scount++; stotal++; 1552 if ((type == MLD2_ALLOW_NEW_SOURCES || 1553 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1554 psf->sf_crcount--; 1555 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1556 if (psf_prev) 1557 psf_prev->sf_next = psf->sf_next; 1558 else 1559 *psf_list = psf->sf_next; 1560 kfree(psf); 1561 continue; 1562 } 1563 } 1564 psf_prev = psf; 1565 } 1566 1567 empty_source: 1568 if (!stotal) { 1569 if (type == MLD2_ALLOW_NEW_SOURCES || 1570 type == MLD2_BLOCK_OLD_SOURCES) 1571 return skb; 1572 if (pmc->mca_crcount || isquery) { 1573 /* make sure we have room for group header */ 1574 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1575 mld_sendpack(skb); 1576 skb = NULL; /* add_grhead will get a new one */ 1577 } 1578 skb = add_grhead(skb, pmc, type, &pgr); 1579 } 1580 } 1581 if (pgr) 1582 pgr->grec_nsrcs = htons(scount); 1583 1584 if (isquery) 1585 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1586 return skb; 1587 } 1588 1589 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1590 { 1591 struct sk_buff *skb = NULL; 1592 int type; 1593 1594 if (!pmc) { 1595 read_lock_bh(&idev->lock); 1596 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1597 if (pmc->mca_flags & MAF_NOREPORT) 1598 continue; 1599 spin_lock_bh(&pmc->mca_lock); 1600 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1601 type = MLD2_MODE_IS_EXCLUDE; 1602 else 1603 type = MLD2_MODE_IS_INCLUDE; 1604 skb = add_grec(skb, pmc, type, 0, 0); 1605 spin_unlock_bh(&pmc->mca_lock); 1606 } 1607 read_unlock_bh(&idev->lock); 1608 } else { 1609 spin_lock_bh(&pmc->mca_lock); 1610 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1611 type = MLD2_MODE_IS_EXCLUDE; 1612 else 1613 type = MLD2_MODE_IS_INCLUDE; 1614 skb = add_grec(skb, pmc, type, 0, 0); 1615 spin_unlock_bh(&pmc->mca_lock); 1616 } 1617 if (skb) 1618 mld_sendpack(skb); 1619 } 1620 1621 /* 1622 * remove zero-count source records from a source filter list 1623 */ 1624 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1625 { 1626 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1627 1628 psf_prev = NULL; 1629 for (psf=*ppsf; psf; psf = psf_next) { 1630 psf_next = psf->sf_next; 1631 if (psf->sf_crcount == 0) { 1632 if (psf_prev) 1633 psf_prev->sf_next = psf->sf_next; 1634 else 1635 *ppsf = psf->sf_next; 1636 kfree(psf); 1637 } else 1638 psf_prev = psf; 1639 } 1640 } 1641 1642 static void mld_send_cr(struct inet6_dev *idev) 1643 { 1644 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1645 struct sk_buff *skb = NULL; 1646 int type, dtype; 1647 1648 read_lock_bh(&idev->lock); 1649 spin_lock(&idev->mc_lock); 1650 1651 /* deleted MCA's */ 1652 pmc_prev = NULL; 1653 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1654 pmc_next = pmc->next; 1655 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1656 type = MLD2_BLOCK_OLD_SOURCES; 1657 dtype = MLD2_BLOCK_OLD_SOURCES; 1658 skb = add_grec(skb, pmc, type, 1, 0); 1659 skb = add_grec(skb, pmc, dtype, 1, 1); 1660 } 1661 if (pmc->mca_crcount) { 1662 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1663 type = MLD2_CHANGE_TO_INCLUDE; 1664 skb = add_grec(skb, pmc, type, 1, 0); 1665 } 1666 pmc->mca_crcount--; 1667 if (pmc->mca_crcount == 0) { 1668 mld_clear_zeros(&pmc->mca_tomb); 1669 mld_clear_zeros(&pmc->mca_sources); 1670 } 1671 } 1672 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1673 !pmc->mca_sources) { 1674 if (pmc_prev) 1675 pmc_prev->next = pmc_next; 1676 else 1677 idev->mc_tomb = pmc_next; 1678 in6_dev_put(pmc->idev); 1679 kfree(pmc); 1680 } else 1681 pmc_prev = pmc; 1682 } 1683 spin_unlock(&idev->mc_lock); 1684 1685 /* change recs */ 1686 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1687 spin_lock_bh(&pmc->mca_lock); 1688 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1689 type = MLD2_BLOCK_OLD_SOURCES; 1690 dtype = MLD2_ALLOW_NEW_SOURCES; 1691 } else { 1692 type = MLD2_ALLOW_NEW_SOURCES; 1693 dtype = MLD2_BLOCK_OLD_SOURCES; 1694 } 1695 skb = add_grec(skb, pmc, type, 0, 0); 1696 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1697 1698 /* filter mode changes */ 1699 if (pmc->mca_crcount) { 1700 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1701 type = MLD2_CHANGE_TO_EXCLUDE; 1702 else 1703 type = MLD2_CHANGE_TO_INCLUDE; 1704 skb = add_grec(skb, pmc, type, 0, 0); 1705 pmc->mca_crcount--; 1706 } 1707 spin_unlock_bh(&pmc->mca_lock); 1708 } 1709 read_unlock_bh(&idev->lock); 1710 if (!skb) 1711 return; 1712 (void) mld_sendpack(skb); 1713 } 1714 1715 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1716 { 1717 struct net *net = dev_net(dev); 1718 struct sock *sk = net->ipv6.igmp_sk; 1719 struct inet6_dev *idev; 1720 struct sk_buff *skb; 1721 struct mld_msg *hdr; 1722 const struct in6_addr *snd_addr, *saddr; 1723 struct in6_addr addr_buf; 1724 int err, len, payload_len, full_len; 1725 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1726 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1727 IPV6_TLV_PADN, 0 }; 1728 struct flowi fl; 1729 struct dst_entry *dst; 1730 1731 if (type == ICMPV6_MGM_REDUCTION) 1732 snd_addr = &in6addr_linklocal_allrouters; 1733 else 1734 snd_addr = addr; 1735 1736 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1737 payload_len = len + sizeof(ra); 1738 full_len = sizeof(struct ipv6hdr) + payload_len; 1739 1740 rcu_read_lock(); 1741 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1742 IPSTATS_MIB_OUT, full_len); 1743 rcu_read_unlock(); 1744 1745 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err); 1746 1747 if (skb == NULL) { 1748 rcu_read_lock(); 1749 IP6_INC_STATS(net, __in6_dev_get(dev), 1750 IPSTATS_MIB_OUTDISCARDS); 1751 rcu_read_unlock(); 1752 return; 1753 } 1754 1755 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1756 1757 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1758 /* <draft-ietf-magma-mld-source-05.txt>: 1759 * use unspecified address as the source address 1760 * when a valid link-local address is not available. 1761 */ 1762 saddr = &in6addr_any; 1763 } else 1764 saddr = &addr_buf; 1765 1766 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1767 1768 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1769 1770 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); 1771 memset(hdr, 0, sizeof(struct mld_msg)); 1772 hdr->mld_type = type; 1773 ipv6_addr_copy(&hdr->mld_mca, addr); 1774 1775 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1776 IPPROTO_ICMPV6, 1777 csum_partial(hdr, len, 0)); 1778 1779 idev = in6_dev_get(skb->dev); 1780 1781 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1782 if (!dst) { 1783 err = -ENOMEM; 1784 goto err_out; 1785 } 1786 1787 icmpv6_flow_init(sk, &fl, type, 1788 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1789 skb->dev->ifindex); 1790 1791 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1792 if (err) 1793 goto err_out; 1794 1795 skb_dst_set(skb, dst); 1796 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1797 dst_output); 1798 out: 1799 if (!err) { 1800 ICMP6MSGOUT_INC_STATS(net, idev, type); 1801 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1802 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1803 } else 1804 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1805 1806 if (likely(idev != NULL)) 1807 in6_dev_put(idev); 1808 return; 1809 1810 err_out: 1811 kfree_skb(skb); 1812 goto out; 1813 } 1814 1815 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1816 struct in6_addr *psfsrc) 1817 { 1818 struct ip6_sf_list *psf, *psf_prev; 1819 int rv = 0; 1820 1821 psf_prev = NULL; 1822 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1823 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1824 break; 1825 psf_prev = psf; 1826 } 1827 if (!psf || psf->sf_count[sfmode] == 0) { 1828 /* source filter not found, or count wrong => bug */ 1829 return -ESRCH; 1830 } 1831 psf->sf_count[sfmode]--; 1832 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1833 struct inet6_dev *idev = pmc->idev; 1834 1835 /* no more filters for this source */ 1836 if (psf_prev) 1837 psf_prev->sf_next = psf->sf_next; 1838 else 1839 pmc->mca_sources = psf->sf_next; 1840 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1841 !MLD_V1_SEEN(idev)) { 1842 psf->sf_crcount = idev->mc_qrv; 1843 psf->sf_next = pmc->mca_tomb; 1844 pmc->mca_tomb = psf; 1845 rv = 1; 1846 } else 1847 kfree(psf); 1848 } 1849 return rv; 1850 } 1851 1852 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1853 int sfmode, int sfcount, struct in6_addr *psfsrc, 1854 int delta) 1855 { 1856 struct ifmcaddr6 *pmc; 1857 int changerec = 0; 1858 int i, err; 1859 1860 if (!idev) 1861 return -ENODEV; 1862 read_lock_bh(&idev->lock); 1863 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1864 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1865 break; 1866 } 1867 if (!pmc) { 1868 /* MCA not found?? bug */ 1869 read_unlock_bh(&idev->lock); 1870 return -ESRCH; 1871 } 1872 spin_lock_bh(&pmc->mca_lock); 1873 sf_markstate(pmc); 1874 if (!delta) { 1875 if (!pmc->mca_sfcount[sfmode]) { 1876 spin_unlock_bh(&pmc->mca_lock); 1877 read_unlock_bh(&idev->lock); 1878 return -EINVAL; 1879 } 1880 pmc->mca_sfcount[sfmode]--; 1881 } 1882 err = 0; 1883 for (i=0; i<sfcount; i++) { 1884 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1885 1886 changerec |= rv > 0; 1887 if (!err && rv < 0) 1888 err = rv; 1889 } 1890 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1891 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1892 pmc->mca_sfcount[MCAST_INCLUDE]) { 1893 struct ip6_sf_list *psf; 1894 1895 /* filter mode change */ 1896 pmc->mca_sfmode = MCAST_INCLUDE; 1897 pmc->mca_crcount = idev->mc_qrv; 1898 idev->mc_ifc_count = pmc->mca_crcount; 1899 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1900 psf->sf_crcount = 0; 1901 mld_ifc_event(pmc->idev); 1902 } else if (sf_setstate(pmc) || changerec) 1903 mld_ifc_event(pmc->idev); 1904 spin_unlock_bh(&pmc->mca_lock); 1905 read_unlock_bh(&idev->lock); 1906 return err; 1907 } 1908 1909 /* 1910 * Add multicast single-source filter to the interface list 1911 */ 1912 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1913 struct in6_addr *psfsrc, int delta) 1914 { 1915 struct ip6_sf_list *psf, *psf_prev; 1916 1917 psf_prev = NULL; 1918 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1919 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1920 break; 1921 psf_prev = psf; 1922 } 1923 if (!psf) { 1924 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1925 if (!psf) 1926 return -ENOBUFS; 1927 1928 psf->sf_addr = *psfsrc; 1929 if (psf_prev) { 1930 psf_prev->sf_next = psf; 1931 } else 1932 pmc->mca_sources = psf; 1933 } 1934 psf->sf_count[sfmode]++; 1935 return 0; 1936 } 1937 1938 static void sf_markstate(struct ifmcaddr6 *pmc) 1939 { 1940 struct ip6_sf_list *psf; 1941 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1942 1943 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1944 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1945 psf->sf_oldin = mca_xcount == 1946 psf->sf_count[MCAST_EXCLUDE] && 1947 !psf->sf_count[MCAST_INCLUDE]; 1948 } else 1949 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1950 } 1951 1952 static int sf_setstate(struct ifmcaddr6 *pmc) 1953 { 1954 struct ip6_sf_list *psf, *dpsf; 1955 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1956 int qrv = pmc->idev->mc_qrv; 1957 int new_in, rv; 1958 1959 rv = 0; 1960 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1961 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1962 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1963 !psf->sf_count[MCAST_INCLUDE]; 1964 } else 1965 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1966 if (new_in) { 1967 if (!psf->sf_oldin) { 1968 struct ip6_sf_list *prev = NULL; 1969 1970 for (dpsf=pmc->mca_tomb; dpsf; 1971 dpsf=dpsf->sf_next) { 1972 if (ipv6_addr_equal(&dpsf->sf_addr, 1973 &psf->sf_addr)) 1974 break; 1975 prev = dpsf; 1976 } 1977 if (dpsf) { 1978 if (prev) 1979 prev->sf_next = dpsf->sf_next; 1980 else 1981 pmc->mca_tomb = dpsf->sf_next; 1982 kfree(dpsf); 1983 } 1984 psf->sf_crcount = qrv; 1985 rv++; 1986 } 1987 } else if (psf->sf_oldin) { 1988 psf->sf_crcount = 0; 1989 /* 1990 * add or update "delete" records if an active filter 1991 * is now inactive 1992 */ 1993 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 1994 if (ipv6_addr_equal(&dpsf->sf_addr, 1995 &psf->sf_addr)) 1996 break; 1997 if (!dpsf) { 1998 dpsf = (struct ip6_sf_list *) 1999 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2000 if (!dpsf) 2001 continue; 2002 *dpsf = *psf; 2003 /* pmc->mca_lock held by callers */ 2004 dpsf->sf_next = pmc->mca_tomb; 2005 pmc->mca_tomb = dpsf; 2006 } 2007 dpsf->sf_crcount = qrv; 2008 rv++; 2009 } 2010 } 2011 return rv; 2012 } 2013 2014 /* 2015 * Add multicast source filter list to the interface list 2016 */ 2017 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2018 int sfmode, int sfcount, struct in6_addr *psfsrc, 2019 int delta) 2020 { 2021 struct ifmcaddr6 *pmc; 2022 int isexclude; 2023 int i, err; 2024 2025 if (!idev) 2026 return -ENODEV; 2027 read_lock_bh(&idev->lock); 2028 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2029 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2030 break; 2031 } 2032 if (!pmc) { 2033 /* MCA not found?? bug */ 2034 read_unlock_bh(&idev->lock); 2035 return -ESRCH; 2036 } 2037 spin_lock_bh(&pmc->mca_lock); 2038 2039 sf_markstate(pmc); 2040 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2041 if (!delta) 2042 pmc->mca_sfcount[sfmode]++; 2043 err = 0; 2044 for (i=0; i<sfcount; i++) { 2045 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2046 if (err) 2047 break; 2048 } 2049 if (err) { 2050 int j; 2051 2052 if (!delta) 2053 pmc->mca_sfcount[sfmode]--; 2054 for (j=0; j<i; j++) 2055 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2056 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2057 struct ip6_sf_list *psf; 2058 2059 /* filter mode change */ 2060 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2061 pmc->mca_sfmode = MCAST_EXCLUDE; 2062 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2063 pmc->mca_sfmode = MCAST_INCLUDE; 2064 /* else no filters; keep old mode for reports */ 2065 2066 pmc->mca_crcount = idev->mc_qrv; 2067 idev->mc_ifc_count = pmc->mca_crcount; 2068 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2069 psf->sf_crcount = 0; 2070 mld_ifc_event(idev); 2071 } else if (sf_setstate(pmc)) 2072 mld_ifc_event(idev); 2073 spin_unlock_bh(&pmc->mca_lock); 2074 read_unlock_bh(&idev->lock); 2075 return err; 2076 } 2077 2078 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2079 { 2080 struct ip6_sf_list *psf, *nextpsf; 2081 2082 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2083 nextpsf = psf->sf_next; 2084 kfree(psf); 2085 } 2086 pmc->mca_tomb = NULL; 2087 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2088 nextpsf = psf->sf_next; 2089 kfree(psf); 2090 } 2091 pmc->mca_sources = NULL; 2092 pmc->mca_sfmode = MCAST_EXCLUDE; 2093 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2094 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2095 } 2096 2097 2098 static void igmp6_join_group(struct ifmcaddr6 *ma) 2099 { 2100 unsigned long delay; 2101 2102 if (ma->mca_flags & MAF_NOREPORT) 2103 return; 2104 2105 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2106 2107 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2108 2109 spin_lock_bh(&ma->mca_lock); 2110 if (del_timer(&ma->mca_timer)) { 2111 atomic_dec(&ma->mca_refcnt); 2112 delay = ma->mca_timer.expires - jiffies; 2113 } 2114 2115 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2116 atomic_inc(&ma->mca_refcnt); 2117 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2118 spin_unlock_bh(&ma->mca_lock); 2119 } 2120 2121 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2122 struct inet6_dev *idev) 2123 { 2124 int err; 2125 2126 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2127 * so no other readers or writers of iml or its sflist 2128 */ 2129 if (!iml->sflist) { 2130 /* any-source empty exclude case */ 2131 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2132 } 2133 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2134 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2135 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2136 iml->sflist = NULL; 2137 return err; 2138 } 2139 2140 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2141 { 2142 if (MLD_V1_SEEN(ma->idev)) { 2143 if (ma->mca_flags & MAF_LAST_REPORTER) 2144 igmp6_send(&ma->mca_addr, ma->idev->dev, 2145 ICMPV6_MGM_REDUCTION); 2146 } else { 2147 mld_add_delrec(ma->idev, ma); 2148 mld_ifc_event(ma->idev); 2149 } 2150 } 2151 2152 static void mld_gq_timer_expire(unsigned long data) 2153 { 2154 struct inet6_dev *idev = (struct inet6_dev *)data; 2155 2156 idev->mc_gq_running = 0; 2157 mld_send_report(idev, NULL); 2158 __in6_dev_put(idev); 2159 } 2160 2161 static void mld_ifc_timer_expire(unsigned long data) 2162 { 2163 struct inet6_dev *idev = (struct inet6_dev *)data; 2164 2165 mld_send_cr(idev); 2166 if (idev->mc_ifc_count) { 2167 idev->mc_ifc_count--; 2168 if (idev->mc_ifc_count) 2169 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2170 } 2171 __in6_dev_put(idev); 2172 } 2173 2174 static void mld_ifc_event(struct inet6_dev *idev) 2175 { 2176 if (MLD_V1_SEEN(idev)) 2177 return; 2178 idev->mc_ifc_count = idev->mc_qrv; 2179 mld_ifc_start_timer(idev, 1); 2180 } 2181 2182 2183 static void igmp6_timer_handler(unsigned long data) 2184 { 2185 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2186 2187 if (MLD_V1_SEEN(ma->idev)) 2188 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2189 else 2190 mld_send_report(ma->idev, ma); 2191 2192 spin_lock(&ma->mca_lock); 2193 ma->mca_flags |= MAF_LAST_REPORTER; 2194 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2195 spin_unlock(&ma->mca_lock); 2196 ma_put(ma); 2197 } 2198 2199 /* Device changing type */ 2200 2201 void ipv6_mc_unmap(struct inet6_dev *idev) 2202 { 2203 struct ifmcaddr6 *i; 2204 2205 /* Install multicast list, except for all-nodes (already installed) */ 2206 2207 read_lock_bh(&idev->lock); 2208 for (i = idev->mc_list; i; i = i->next) 2209 igmp6_group_dropped(i); 2210 read_unlock_bh(&idev->lock); 2211 } 2212 2213 void ipv6_mc_remap(struct inet6_dev *idev) 2214 { 2215 ipv6_mc_up(idev); 2216 } 2217 2218 /* Device going down */ 2219 2220 void ipv6_mc_down(struct inet6_dev *idev) 2221 { 2222 struct ifmcaddr6 *i; 2223 2224 /* Withdraw multicast list */ 2225 2226 read_lock_bh(&idev->lock); 2227 idev->mc_ifc_count = 0; 2228 if (del_timer(&idev->mc_ifc_timer)) 2229 __in6_dev_put(idev); 2230 idev->mc_gq_running = 0; 2231 if (del_timer(&idev->mc_gq_timer)) 2232 __in6_dev_put(idev); 2233 2234 for (i = idev->mc_list; i; i=i->next) 2235 igmp6_group_dropped(i); 2236 read_unlock_bh(&idev->lock); 2237 2238 mld_clear_delrec(idev); 2239 } 2240 2241 2242 /* Device going up */ 2243 2244 void ipv6_mc_up(struct inet6_dev *idev) 2245 { 2246 struct ifmcaddr6 *i; 2247 2248 /* Install multicast list, except for all-nodes (already installed) */ 2249 2250 read_lock_bh(&idev->lock); 2251 for (i = idev->mc_list; i; i=i->next) 2252 igmp6_group_added(i); 2253 read_unlock_bh(&idev->lock); 2254 } 2255 2256 /* IPv6 device initialization. */ 2257 2258 void ipv6_mc_init_dev(struct inet6_dev *idev) 2259 { 2260 write_lock_bh(&idev->lock); 2261 spin_lock_init(&idev->mc_lock); 2262 idev->mc_gq_running = 0; 2263 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2264 (unsigned long)idev); 2265 idev->mc_tomb = NULL; 2266 idev->mc_ifc_count = 0; 2267 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2268 (unsigned long)idev); 2269 idev->mc_qrv = MLD_QRV_DEFAULT; 2270 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2271 idev->mc_v1_seen = 0; 2272 write_unlock_bh(&idev->lock); 2273 } 2274 2275 /* 2276 * Device is about to be destroyed: clean up. 2277 */ 2278 2279 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2280 { 2281 struct ifmcaddr6 *i; 2282 2283 /* Deactivate timers */ 2284 ipv6_mc_down(idev); 2285 2286 /* Delete all-nodes address. */ 2287 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2288 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2289 * fail. 2290 */ 2291 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2292 2293 if (idev->cnf.forwarding) 2294 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2295 2296 write_lock_bh(&idev->lock); 2297 while ((i = idev->mc_list) != NULL) { 2298 idev->mc_list = i->next; 2299 write_unlock_bh(&idev->lock); 2300 2301 igmp6_group_dropped(i); 2302 ma_put(i); 2303 2304 write_lock_bh(&idev->lock); 2305 } 2306 write_unlock_bh(&idev->lock); 2307 } 2308 2309 #ifdef CONFIG_PROC_FS 2310 struct igmp6_mc_iter_state { 2311 struct seq_net_private p; 2312 struct net_device *dev; 2313 struct inet6_dev *idev; 2314 }; 2315 2316 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2317 2318 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2319 { 2320 struct ifmcaddr6 *im = NULL; 2321 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2322 struct net *net = seq_file_net(seq); 2323 2324 state->idev = NULL; 2325 for_each_netdev_rcu(net, state->dev) { 2326 struct inet6_dev *idev; 2327 idev = __in6_dev_get(state->dev); 2328 if (!idev) 2329 continue; 2330 read_lock_bh(&idev->lock); 2331 im = idev->mc_list; 2332 if (im) { 2333 state->idev = idev; 2334 break; 2335 } 2336 read_unlock_bh(&idev->lock); 2337 } 2338 return im; 2339 } 2340 2341 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2342 { 2343 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2344 2345 im = im->next; 2346 while (!im) { 2347 if (likely(state->idev != NULL)) 2348 read_unlock_bh(&state->idev->lock); 2349 2350 state->dev = next_net_device_rcu(state->dev); 2351 if (!state->dev) { 2352 state->idev = NULL; 2353 break; 2354 } 2355 state->idev = __in6_dev_get(state->dev); 2356 if (!state->idev) 2357 continue; 2358 read_lock_bh(&state->idev->lock); 2359 im = state->idev->mc_list; 2360 } 2361 return im; 2362 } 2363 2364 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2365 { 2366 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2367 if (im) 2368 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2369 --pos; 2370 return pos ? NULL : im; 2371 } 2372 2373 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2374 __acquires(RCU) 2375 { 2376 rcu_read_lock(); 2377 return igmp6_mc_get_idx(seq, *pos); 2378 } 2379 2380 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2381 { 2382 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2383 2384 ++*pos; 2385 return im; 2386 } 2387 2388 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2389 __releases(RCU) 2390 { 2391 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2392 2393 if (likely(state->idev != NULL)) { 2394 read_unlock_bh(&state->idev->lock); 2395 state->idev = NULL; 2396 } 2397 state->dev = NULL; 2398 rcu_read_unlock(); 2399 } 2400 2401 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2402 { 2403 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2404 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2405 2406 seq_printf(seq, 2407 "%-4d %-15s %pi6 %5d %08X %ld\n", 2408 state->dev->ifindex, state->dev->name, 2409 &im->mca_addr, 2410 im->mca_users, im->mca_flags, 2411 (im->mca_flags&MAF_TIMER_RUNNING) ? 2412 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2413 return 0; 2414 } 2415 2416 static const struct seq_operations igmp6_mc_seq_ops = { 2417 .start = igmp6_mc_seq_start, 2418 .next = igmp6_mc_seq_next, 2419 .stop = igmp6_mc_seq_stop, 2420 .show = igmp6_mc_seq_show, 2421 }; 2422 2423 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2424 { 2425 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2426 sizeof(struct igmp6_mc_iter_state)); 2427 } 2428 2429 static const struct file_operations igmp6_mc_seq_fops = { 2430 .owner = THIS_MODULE, 2431 .open = igmp6_mc_seq_open, 2432 .read = seq_read, 2433 .llseek = seq_lseek, 2434 .release = seq_release_net, 2435 }; 2436 2437 struct igmp6_mcf_iter_state { 2438 struct seq_net_private p; 2439 struct net_device *dev; 2440 struct inet6_dev *idev; 2441 struct ifmcaddr6 *im; 2442 }; 2443 2444 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2445 2446 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2447 { 2448 struct ip6_sf_list *psf = NULL; 2449 struct ifmcaddr6 *im = NULL; 2450 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2451 struct net *net = seq_file_net(seq); 2452 2453 state->idev = NULL; 2454 state->im = NULL; 2455 for_each_netdev_rcu(net, state->dev) { 2456 struct inet6_dev *idev; 2457 idev = __in6_dev_get(state->dev); 2458 if (unlikely(idev == NULL)) 2459 continue; 2460 read_lock_bh(&idev->lock); 2461 im = idev->mc_list; 2462 if (likely(im != NULL)) { 2463 spin_lock_bh(&im->mca_lock); 2464 psf = im->mca_sources; 2465 if (likely(psf != NULL)) { 2466 state->im = im; 2467 state->idev = idev; 2468 break; 2469 } 2470 spin_unlock_bh(&im->mca_lock); 2471 } 2472 read_unlock_bh(&idev->lock); 2473 } 2474 return psf; 2475 } 2476 2477 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2478 { 2479 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2480 2481 psf = psf->sf_next; 2482 while (!psf) { 2483 spin_unlock_bh(&state->im->mca_lock); 2484 state->im = state->im->next; 2485 while (!state->im) { 2486 if (likely(state->idev != NULL)) 2487 read_unlock_bh(&state->idev->lock); 2488 2489 state->dev = next_net_device_rcu(state->dev); 2490 if (!state->dev) { 2491 state->idev = NULL; 2492 goto out; 2493 } 2494 state->idev = __in6_dev_get(state->dev); 2495 if (!state->idev) 2496 continue; 2497 read_lock_bh(&state->idev->lock); 2498 state->im = state->idev->mc_list; 2499 } 2500 if (!state->im) 2501 break; 2502 spin_lock_bh(&state->im->mca_lock); 2503 psf = state->im->mca_sources; 2504 } 2505 out: 2506 return psf; 2507 } 2508 2509 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2510 { 2511 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2512 if (psf) 2513 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2514 --pos; 2515 return pos ? NULL : psf; 2516 } 2517 2518 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2519 __acquires(RCU) 2520 { 2521 rcu_read_lock(); 2522 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2523 } 2524 2525 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2526 { 2527 struct ip6_sf_list *psf; 2528 if (v == SEQ_START_TOKEN) 2529 psf = igmp6_mcf_get_first(seq); 2530 else 2531 psf = igmp6_mcf_get_next(seq, v); 2532 ++*pos; 2533 return psf; 2534 } 2535 2536 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2537 __releases(RCU) 2538 { 2539 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2540 if (likely(state->im != NULL)) { 2541 spin_unlock_bh(&state->im->mca_lock); 2542 state->im = NULL; 2543 } 2544 if (likely(state->idev != NULL)) { 2545 read_unlock_bh(&state->idev->lock); 2546 state->idev = NULL; 2547 } 2548 state->dev = NULL; 2549 rcu_read_unlock(); 2550 } 2551 2552 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2553 { 2554 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2555 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2556 2557 if (v == SEQ_START_TOKEN) { 2558 seq_printf(seq, 2559 "%3s %6s " 2560 "%32s %32s %6s %6s\n", "Idx", 2561 "Device", "Multicast Address", 2562 "Source Address", "INC", "EXC"); 2563 } else { 2564 seq_printf(seq, 2565 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2566 state->dev->ifindex, state->dev->name, 2567 &state->im->mca_addr, 2568 &psf->sf_addr, 2569 psf->sf_count[MCAST_INCLUDE], 2570 psf->sf_count[MCAST_EXCLUDE]); 2571 } 2572 return 0; 2573 } 2574 2575 static const struct seq_operations igmp6_mcf_seq_ops = { 2576 .start = igmp6_mcf_seq_start, 2577 .next = igmp6_mcf_seq_next, 2578 .stop = igmp6_mcf_seq_stop, 2579 .show = igmp6_mcf_seq_show, 2580 }; 2581 2582 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2583 { 2584 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2585 sizeof(struct igmp6_mcf_iter_state)); 2586 } 2587 2588 static const struct file_operations igmp6_mcf_seq_fops = { 2589 .owner = THIS_MODULE, 2590 .open = igmp6_mcf_seq_open, 2591 .read = seq_read, 2592 .llseek = seq_lseek, 2593 .release = seq_release_net, 2594 }; 2595 2596 static int __net_init igmp6_proc_init(struct net *net) 2597 { 2598 int err; 2599 2600 err = -ENOMEM; 2601 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2602 goto out; 2603 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2604 &igmp6_mcf_seq_fops)) 2605 goto out_proc_net_igmp6; 2606 2607 err = 0; 2608 out: 2609 return err; 2610 2611 out_proc_net_igmp6: 2612 proc_net_remove(net, "igmp6"); 2613 goto out; 2614 } 2615 2616 static void __net_exit igmp6_proc_exit(struct net *net) 2617 { 2618 proc_net_remove(net, "mcfilter6"); 2619 proc_net_remove(net, "igmp6"); 2620 } 2621 #else 2622 static inline int igmp6_proc_init(struct net *net) 2623 { 2624 return 0; 2625 } 2626 static inline void igmp6_proc_exit(struct net *net) 2627 { 2628 } 2629 #endif 2630 2631 static int __net_init igmp6_net_init(struct net *net) 2632 { 2633 int err; 2634 2635 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2636 SOCK_RAW, IPPROTO_ICMPV6, net); 2637 if (err < 0) { 2638 printk(KERN_ERR 2639 "Failed to initialize the IGMP6 control socket (err %d).\n", 2640 err); 2641 goto out; 2642 } 2643 2644 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2645 2646 err = igmp6_proc_init(net); 2647 if (err) 2648 goto out_sock_create; 2649 out: 2650 return err; 2651 2652 out_sock_create: 2653 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2654 goto out; 2655 } 2656 2657 static void __net_exit igmp6_net_exit(struct net *net) 2658 { 2659 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2660 igmp6_proc_exit(net); 2661 } 2662 2663 static struct pernet_operations igmp6_net_ops = { 2664 .init = igmp6_net_init, 2665 .exit = igmp6_net_exit, 2666 }; 2667 2668 int __init igmp6_init(void) 2669 { 2670 return register_pernet_subsys(&igmp6_net_ops); 2671 } 2672 2673 void igmp6_cleanup(void) 2674 { 2675 unregister_pernet_subsys(&igmp6_net_ops); 2676 } 2677