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 47 #include <linux/netfilter.h> 48 #include <linux/netfilter_ipv6.h> 49 50 #include <net/net_namespace.h> 51 #include <net/sock.h> 52 #include <net/snmp.h> 53 54 #include <net/ipv6.h> 55 #include <net/protocol.h> 56 #include <net/if_inet6.h> 57 #include <net/ndisc.h> 58 #include <net/addrconf.h> 59 #include <net/ip6_route.h> 60 #include <net/inet_common.h> 61 62 #include <net/ip6_checksum.h> 63 64 /* Set to 3 to get tracing... */ 65 #define MCAST_DEBUG 2 66 67 #if MCAST_DEBUG >= 3 68 #define MDBG(x) printk x 69 #else 70 #define MDBG(x) 71 #endif 72 73 /* 74 * These header formats should be in a separate include file, but icmpv6.h 75 * doesn't have in6_addr defined in all cases, there is no __u128, and no 76 * other files reference these. 77 * 78 * +-DLS 4/14/03 79 */ 80 81 /* Multicast Listener Discovery version 2 headers */ 82 83 struct mld2_grec { 84 __u8 grec_type; 85 __u8 grec_auxwords; 86 __be16 grec_nsrcs; 87 struct in6_addr grec_mca; 88 struct in6_addr grec_src[0]; 89 }; 90 91 struct mld2_report { 92 __u8 type; 93 __u8 resv1; 94 __sum16 csum; 95 __be16 resv2; 96 __be16 ngrec; 97 struct mld2_grec grec[0]; 98 }; 99 100 struct mld2_query { 101 __u8 type; 102 __u8 code; 103 __sum16 csum; 104 __be16 mrc; 105 __be16 resv1; 106 struct in6_addr mca; 107 #if defined(__LITTLE_ENDIAN_BITFIELD) 108 __u8 qrv:3, 109 suppress:1, 110 resv2:4; 111 #elif defined(__BIG_ENDIAN_BITFIELD) 112 __u8 resv2:4, 113 suppress:1, 114 qrv:3; 115 #else 116 #error "Please fix <asm/byteorder.h>" 117 #endif 118 __u8 qqic; 119 __be16 nsrcs; 120 struct in6_addr srcs[0]; 121 }; 122 123 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 124 125 /* Big mc list lock for all the sockets */ 126 static DEFINE_RWLOCK(ipv6_sk_mc_lock); 127 128 static void igmp6_join_group(struct ifmcaddr6 *ma); 129 static void igmp6_leave_group(struct ifmcaddr6 *ma); 130 static void igmp6_timer_handler(unsigned long data); 131 132 static void mld_gq_timer_expire(unsigned long data); 133 static void mld_ifc_timer_expire(unsigned long data); 134 static void mld_ifc_event(struct inet6_dev *idev); 135 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 136 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 137 static void mld_clear_delrec(struct inet6_dev *idev); 138 static int sf_setstate(struct ifmcaddr6 *pmc); 139 static void sf_markstate(struct ifmcaddr6 *pmc); 140 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 141 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 142 int sfmode, int sfcount, struct in6_addr *psfsrc, 143 int delta); 144 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 145 int sfmode, int sfcount, struct in6_addr *psfsrc, 146 int delta); 147 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 148 struct inet6_dev *idev); 149 150 151 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 152 #define MLD_QRV_DEFAULT 2 153 154 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \ 155 (idev)->cnf.force_mld_version == 1 || \ 156 ((idev)->mc_v1_seen && \ 157 time_before(jiffies, (idev)->mc_v1_seen))) 158 159 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 160 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 161 ((value) < (thresh) ? (value) : \ 162 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \ 163 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 164 165 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) 166 167 #define IPV6_MLD_MAX_MSF 64 168 169 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 170 171 /* 172 * socket join on multicast group 173 */ 174 175 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 176 { 177 struct net_device *dev = NULL; 178 struct ipv6_mc_socklist *mc_lst; 179 struct ipv6_pinfo *np = inet6_sk(sk); 180 struct net *net = sock_net(sk); 181 int err; 182 183 if (!ipv6_addr_is_multicast(addr)) 184 return -EINVAL; 185 186 read_lock_bh(&ipv6_sk_mc_lock); 187 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 188 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 189 ipv6_addr_equal(&mc_lst->addr, addr)) { 190 read_unlock_bh(&ipv6_sk_mc_lock); 191 return -EADDRINUSE; 192 } 193 } 194 read_unlock_bh(&ipv6_sk_mc_lock); 195 196 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 197 198 if (mc_lst == NULL) 199 return -ENOMEM; 200 201 mc_lst->next = NULL; 202 ipv6_addr_copy(&mc_lst->addr, addr); 203 204 if (ifindex == 0) { 205 struct rt6_info *rt; 206 rt = rt6_lookup(net, addr, NULL, 0, 0); 207 if (rt) { 208 dev = rt->rt6i_dev; 209 dev_hold(dev); 210 dst_release(&rt->u.dst); 211 } 212 } else 213 dev = dev_get_by_index(net, ifindex); 214 215 if (dev == NULL) { 216 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 217 return -ENODEV; 218 } 219 220 mc_lst->ifindex = dev->ifindex; 221 mc_lst->sfmode = MCAST_EXCLUDE; 222 rwlock_init(&mc_lst->sflock); 223 mc_lst->sflist = NULL; 224 225 /* 226 * now add/increase the group membership on the device 227 */ 228 229 err = ipv6_dev_mc_inc(dev, addr); 230 231 if (err) { 232 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 233 dev_put(dev); 234 return err; 235 } 236 237 write_lock_bh(&ipv6_sk_mc_lock); 238 mc_lst->next = np->ipv6_mc_list; 239 np->ipv6_mc_list = mc_lst; 240 write_unlock_bh(&ipv6_sk_mc_lock); 241 242 dev_put(dev); 243 244 return 0; 245 } 246 247 /* 248 * socket leave on multicast group 249 */ 250 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 251 { 252 struct ipv6_pinfo *np = inet6_sk(sk); 253 struct ipv6_mc_socklist *mc_lst, **lnk; 254 struct net *net = sock_net(sk); 255 256 write_lock_bh(&ipv6_sk_mc_lock); 257 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { 258 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 259 ipv6_addr_equal(&mc_lst->addr, addr)) { 260 struct net_device *dev; 261 262 *lnk = mc_lst->next; 263 write_unlock_bh(&ipv6_sk_mc_lock); 264 265 dev = dev_get_by_index(net, mc_lst->ifindex); 266 if (dev != NULL) { 267 struct inet6_dev *idev = in6_dev_get(dev); 268 269 (void) ip6_mc_leave_src(sk, mc_lst, idev); 270 if (idev) { 271 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 272 in6_dev_put(idev); 273 } 274 dev_put(dev); 275 } else 276 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 277 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 278 return 0; 279 } 280 } 281 write_unlock_bh(&ipv6_sk_mc_lock); 282 283 return -EADDRNOTAVAIL; 284 } 285 286 static struct inet6_dev *ip6_mc_find_dev(struct net *net, 287 struct in6_addr *group, 288 int ifindex) 289 { 290 struct net_device *dev = NULL; 291 struct inet6_dev *idev = NULL; 292 293 if (ifindex == 0) { 294 struct rt6_info *rt; 295 296 rt = rt6_lookup(net, group, NULL, 0, 0); 297 if (rt) { 298 dev = rt->rt6i_dev; 299 dev_hold(dev); 300 dst_release(&rt->u.dst); 301 } 302 } else 303 dev = dev_get_by_index(net, ifindex); 304 305 if (!dev) 306 return NULL; 307 idev = in6_dev_get(dev); 308 if (!idev) { 309 dev_put(dev); 310 return NULL; 311 } 312 read_lock_bh(&idev->lock); 313 if (idev->dead) { 314 read_unlock_bh(&idev->lock); 315 in6_dev_put(idev); 316 dev_put(dev); 317 return NULL; 318 } 319 return idev; 320 } 321 322 void ipv6_sock_mc_close(struct sock *sk) 323 { 324 struct ipv6_pinfo *np = inet6_sk(sk); 325 struct ipv6_mc_socklist *mc_lst; 326 struct net *net = sock_net(sk); 327 328 write_lock_bh(&ipv6_sk_mc_lock); 329 while ((mc_lst = np->ipv6_mc_list) != NULL) { 330 struct net_device *dev; 331 332 np->ipv6_mc_list = mc_lst->next; 333 write_unlock_bh(&ipv6_sk_mc_lock); 334 335 dev = dev_get_by_index(net, mc_lst->ifindex); 336 if (dev) { 337 struct inet6_dev *idev = in6_dev_get(dev); 338 339 (void) ip6_mc_leave_src(sk, mc_lst, idev); 340 if (idev) { 341 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 342 in6_dev_put(idev); 343 } 344 dev_put(dev); 345 } else 346 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 347 348 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 349 350 write_lock_bh(&ipv6_sk_mc_lock); 351 } 352 write_unlock_bh(&ipv6_sk_mc_lock); 353 } 354 355 int ip6_mc_source(int add, int omode, struct sock *sk, 356 struct group_source_req *pgsr) 357 { 358 struct in6_addr *source, *group; 359 struct ipv6_mc_socklist *pmc; 360 struct net_device *dev; 361 struct inet6_dev *idev; 362 struct ipv6_pinfo *inet6 = inet6_sk(sk); 363 struct ip6_sf_socklist *psl; 364 struct net *net = sock_net(sk); 365 int i, j, rv; 366 int leavegroup = 0; 367 int pmclocked = 0; 368 int err; 369 370 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 371 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 372 373 if (!ipv6_addr_is_multicast(group)) 374 return -EINVAL; 375 376 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface); 377 if (!idev) 378 return -ENODEV; 379 dev = idev->dev; 380 381 err = -EADDRNOTAVAIL; 382 383 read_lock_bh(&ipv6_sk_mc_lock); 384 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 385 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 386 continue; 387 if (ipv6_addr_equal(&pmc->addr, group)) 388 break; 389 } 390 if (!pmc) { /* must have a prior join */ 391 err = -EINVAL; 392 goto done; 393 } 394 /* if a source filter was set, must be the same mode as before */ 395 if (pmc->sflist) { 396 if (pmc->sfmode != omode) { 397 err = -EINVAL; 398 goto done; 399 } 400 } else if (pmc->sfmode != omode) { 401 /* allow mode switches for empty-set filters */ 402 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 403 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 404 pmc->sfmode = omode; 405 } 406 407 write_lock_bh(&pmc->sflock); 408 pmclocked = 1; 409 410 psl = pmc->sflist; 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 = memcmp(&psl->sl_addr[i], source, 417 sizeof(struct in6_addr)); 418 if (rv == 0) 419 break; 420 } 421 if (rv) /* source not found */ 422 goto done; /* err = -EADDRNOTAVAIL */ 423 424 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 425 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 426 leavegroup = 1; 427 goto done; 428 } 429 430 /* update the interface filter */ 431 ip6_mc_del_src(idev, group, omode, 1, source, 1); 432 433 for (j=i+1; j<psl->sl_count; j++) 434 psl->sl_addr[j-1] = psl->sl_addr[j]; 435 psl->sl_count--; 436 err = 0; 437 goto done; 438 } 439 /* else, add a new source to the filter */ 440 441 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 442 err = -ENOBUFS; 443 goto done; 444 } 445 if (!psl || psl->sl_count == psl->sl_max) { 446 struct ip6_sf_socklist *newpsl; 447 int count = IP6_SFBLOCK; 448 449 if (psl) 450 count += psl->sl_max; 451 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 452 if (!newpsl) { 453 err = -ENOBUFS; 454 goto done; 455 } 456 newpsl->sl_max = count; 457 newpsl->sl_count = count - IP6_SFBLOCK; 458 if (psl) { 459 for (i=0; i<psl->sl_count; i++) 460 newpsl->sl_addr[i] = psl->sl_addr[i]; 461 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 462 } 463 pmc->sflist = psl = newpsl; 464 } 465 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 466 for (i=0; i<psl->sl_count; i++) { 467 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 468 if (rv == 0) 469 break; 470 } 471 if (rv == 0) /* address already there is an error */ 472 goto done; 473 for (j=psl->sl_count-1; j>=i; j--) 474 psl->sl_addr[j+1] = psl->sl_addr[j]; 475 psl->sl_addr[i] = *source; 476 psl->sl_count++; 477 err = 0; 478 /* update the interface list */ 479 ip6_mc_add_src(idev, group, omode, 1, source, 1); 480 done: 481 if (pmclocked) 482 write_unlock_bh(&pmc->sflock); 483 read_unlock_bh(&ipv6_sk_mc_lock); 484 read_unlock_bh(&idev->lock); 485 in6_dev_put(idev); 486 dev_put(dev); 487 if (leavegroup) 488 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 489 return err; 490 } 491 492 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 493 { 494 struct in6_addr *group; 495 struct ipv6_mc_socklist *pmc; 496 struct net_device *dev; 497 struct inet6_dev *idev; 498 struct ipv6_pinfo *inet6 = inet6_sk(sk); 499 struct ip6_sf_socklist *newpsl, *psl; 500 struct net *net = sock_net(sk); 501 int leavegroup = 0; 502 int i, err; 503 504 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 505 506 if (!ipv6_addr_is_multicast(group)) 507 return -EINVAL; 508 if (gsf->gf_fmode != MCAST_INCLUDE && 509 gsf->gf_fmode != MCAST_EXCLUDE) 510 return -EINVAL; 511 512 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 513 514 if (!idev) 515 return -ENODEV; 516 dev = idev->dev; 517 518 err = 0; 519 read_lock_bh(&ipv6_sk_mc_lock); 520 521 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 522 leavegroup = 1; 523 goto done; 524 } 525 526 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 527 if (pmc->ifindex != gsf->gf_interface) 528 continue; 529 if (ipv6_addr_equal(&pmc->addr, group)) 530 break; 531 } 532 if (!pmc) { /* must have a prior join */ 533 err = -EINVAL; 534 goto done; 535 } 536 if (gsf->gf_numsrc) { 537 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 538 GFP_ATOMIC); 539 if (!newpsl) { 540 err = -ENOBUFS; 541 goto done; 542 } 543 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 544 for (i=0; i<newpsl->sl_count; ++i) { 545 struct sockaddr_in6 *psin6; 546 547 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 548 newpsl->sl_addr[i] = psin6->sin6_addr; 549 } 550 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 551 newpsl->sl_count, newpsl->sl_addr, 0); 552 if (err) { 553 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 554 goto done; 555 } 556 } else { 557 newpsl = NULL; 558 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 559 } 560 561 write_lock_bh(&pmc->sflock); 562 psl = pmc->sflist; 563 if (psl) { 564 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 565 psl->sl_count, psl->sl_addr, 0); 566 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 567 } else 568 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 569 pmc->sflist = newpsl; 570 pmc->sfmode = gsf->gf_fmode; 571 write_unlock_bh(&pmc->sflock); 572 err = 0; 573 done: 574 read_unlock_bh(&ipv6_sk_mc_lock); 575 read_unlock_bh(&idev->lock); 576 in6_dev_put(idev); 577 dev_put(dev); 578 if (leavegroup) 579 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 580 return err; 581 } 582 583 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 584 struct group_filter __user *optval, int __user *optlen) 585 { 586 int err, i, count, copycount; 587 struct in6_addr *group; 588 struct ipv6_mc_socklist *pmc; 589 struct inet6_dev *idev; 590 struct net_device *dev; 591 struct ipv6_pinfo *inet6 = inet6_sk(sk); 592 struct ip6_sf_socklist *psl; 593 struct net *net = sock_net(sk); 594 595 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 596 597 if (!ipv6_addr_is_multicast(group)) 598 return -EINVAL; 599 600 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 601 602 if (!idev) 603 return -ENODEV; 604 605 dev = idev->dev; 606 607 err = -EADDRNOTAVAIL; 608 /* 609 * changes to the ipv6_mc_list require the socket lock and 610 * a read lock on ip6_sk_mc_lock. We have the socket lock, 611 * so reading the list is safe. 612 */ 613 614 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 615 if (pmc->ifindex != gsf->gf_interface) 616 continue; 617 if (ipv6_addr_equal(group, &pmc->addr)) 618 break; 619 } 620 if (!pmc) /* must have a prior join */ 621 goto done; 622 gsf->gf_fmode = pmc->sfmode; 623 psl = pmc->sflist; 624 count = psl ? psl->sl_count : 0; 625 read_unlock_bh(&idev->lock); 626 in6_dev_put(idev); 627 dev_put(dev); 628 629 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 630 gsf->gf_numsrc = count; 631 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 632 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 633 return -EFAULT; 634 } 635 /* changes to psl require the socket lock, a read lock on 636 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 637 * have the socket lock, so reading here is safe. 638 */ 639 for (i=0; i<copycount; i++) { 640 struct sockaddr_in6 *psin6; 641 struct sockaddr_storage ss; 642 643 psin6 = (struct sockaddr_in6 *)&ss; 644 memset(&ss, 0, sizeof(ss)); 645 psin6->sin6_family = AF_INET6; 646 psin6->sin6_addr = psl->sl_addr[i]; 647 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 648 return -EFAULT; 649 } 650 return 0; 651 done: 652 read_unlock_bh(&idev->lock); 653 in6_dev_put(idev); 654 dev_put(dev); 655 return err; 656 } 657 658 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 659 const struct in6_addr *src_addr) 660 { 661 struct ipv6_pinfo *np = inet6_sk(sk); 662 struct ipv6_mc_socklist *mc; 663 struct ip6_sf_socklist *psl; 664 int rv = 1; 665 666 read_lock(&ipv6_sk_mc_lock); 667 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 668 if (ipv6_addr_equal(&mc->addr, mc_addr)) 669 break; 670 } 671 if (!mc) { 672 read_unlock(&ipv6_sk_mc_lock); 673 return 1; 674 } 675 read_lock(&mc->sflock); 676 psl = mc->sflist; 677 if (!psl) { 678 rv = mc->sfmode == MCAST_EXCLUDE; 679 } else { 680 int i; 681 682 for (i=0; i<psl->sl_count; i++) { 683 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 684 break; 685 } 686 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 687 rv = 0; 688 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 689 rv = 0; 690 } 691 read_unlock(&mc->sflock); 692 read_unlock(&ipv6_sk_mc_lock); 693 694 return rv; 695 } 696 697 static void ma_put(struct ifmcaddr6 *mc) 698 { 699 if (atomic_dec_and_test(&mc->mca_refcnt)) { 700 in6_dev_put(mc->idev); 701 kfree(mc); 702 } 703 } 704 705 static void igmp6_group_added(struct ifmcaddr6 *mc) 706 { 707 struct net_device *dev = mc->idev->dev; 708 char buf[MAX_ADDR_LEN]; 709 710 spin_lock_bh(&mc->mca_lock); 711 if (!(mc->mca_flags&MAF_LOADED)) { 712 mc->mca_flags |= MAF_LOADED; 713 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 714 dev_mc_add(dev, buf, dev->addr_len, 0); 715 } 716 spin_unlock_bh(&mc->mca_lock); 717 718 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 719 return; 720 721 if (MLD_V1_SEEN(mc->idev)) { 722 igmp6_join_group(mc); 723 return; 724 } 725 /* else v2 */ 726 727 mc->mca_crcount = mc->idev->mc_qrv; 728 mld_ifc_event(mc->idev); 729 } 730 731 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 732 { 733 struct net_device *dev = mc->idev->dev; 734 char buf[MAX_ADDR_LEN]; 735 736 spin_lock_bh(&mc->mca_lock); 737 if (mc->mca_flags&MAF_LOADED) { 738 mc->mca_flags &= ~MAF_LOADED; 739 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 740 dev_mc_delete(dev, buf, dev->addr_len, 0); 741 } 742 743 if (mc->mca_flags & MAF_NOREPORT) 744 goto done; 745 spin_unlock_bh(&mc->mca_lock); 746 747 if (!mc->idev->dead) 748 igmp6_leave_group(mc); 749 750 spin_lock_bh(&mc->mca_lock); 751 if (del_timer(&mc->mca_timer)) 752 atomic_dec(&mc->mca_refcnt); 753 done: 754 ip6_mc_clear_src(mc); 755 spin_unlock_bh(&mc->mca_lock); 756 } 757 758 /* 759 * deleted ifmcaddr6 manipulation 760 */ 761 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 762 { 763 struct ifmcaddr6 *pmc; 764 765 /* this is an "ifmcaddr6" for convenience; only the fields below 766 * are actually used. In particular, the refcnt and users are not 767 * used for management of the delete list. Using the same structure 768 * for deleted items allows change reports to use common code with 769 * non-deleted or query-response MCA's. 770 */ 771 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 772 if (!pmc) 773 return; 774 775 spin_lock_bh(&im->mca_lock); 776 spin_lock_init(&pmc->mca_lock); 777 pmc->idev = im->idev; 778 in6_dev_hold(idev); 779 pmc->mca_addr = im->mca_addr; 780 pmc->mca_crcount = idev->mc_qrv; 781 pmc->mca_sfmode = im->mca_sfmode; 782 if (pmc->mca_sfmode == MCAST_INCLUDE) { 783 struct ip6_sf_list *psf; 784 785 pmc->mca_tomb = im->mca_tomb; 786 pmc->mca_sources = im->mca_sources; 787 im->mca_tomb = im->mca_sources = NULL; 788 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 789 psf->sf_crcount = pmc->mca_crcount; 790 } 791 spin_unlock_bh(&im->mca_lock); 792 793 write_lock_bh(&idev->mc_lock); 794 pmc->next = idev->mc_tomb; 795 idev->mc_tomb = pmc; 796 write_unlock_bh(&idev->mc_lock); 797 } 798 799 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 800 { 801 struct ifmcaddr6 *pmc, *pmc_prev; 802 struct ip6_sf_list *psf, *psf_next; 803 804 write_lock_bh(&idev->mc_lock); 805 pmc_prev = NULL; 806 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 807 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 808 break; 809 pmc_prev = pmc; 810 } 811 if (pmc) { 812 if (pmc_prev) 813 pmc_prev->next = pmc->next; 814 else 815 idev->mc_tomb = pmc->next; 816 } 817 write_unlock_bh(&idev->mc_lock); 818 if (pmc) { 819 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 820 psf_next = psf->sf_next; 821 kfree(psf); 822 } 823 in6_dev_put(pmc->idev); 824 kfree(pmc); 825 } 826 } 827 828 static void mld_clear_delrec(struct inet6_dev *idev) 829 { 830 struct ifmcaddr6 *pmc, *nextpmc; 831 832 write_lock_bh(&idev->mc_lock); 833 pmc = idev->mc_tomb; 834 idev->mc_tomb = NULL; 835 write_unlock_bh(&idev->mc_lock); 836 837 for (; pmc; pmc = nextpmc) { 838 nextpmc = pmc->next; 839 ip6_mc_clear_src(pmc); 840 in6_dev_put(pmc->idev); 841 kfree(pmc); 842 } 843 844 /* clear dead sources, too */ 845 read_lock_bh(&idev->lock); 846 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 847 struct ip6_sf_list *psf, *psf_next; 848 849 spin_lock_bh(&pmc->mca_lock); 850 psf = pmc->mca_tomb; 851 pmc->mca_tomb = NULL; 852 spin_unlock_bh(&pmc->mca_lock); 853 for (; psf; psf=psf_next) { 854 psf_next = psf->sf_next; 855 kfree(psf); 856 } 857 } 858 read_unlock_bh(&idev->lock); 859 } 860 861 862 /* 863 * device multicast group inc (add if not found) 864 */ 865 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 866 { 867 struct ifmcaddr6 *mc; 868 struct inet6_dev *idev; 869 870 idev = in6_dev_get(dev); 871 872 if (idev == NULL) 873 return -EINVAL; 874 875 write_lock_bh(&idev->lock); 876 if (idev->dead) { 877 write_unlock_bh(&idev->lock); 878 in6_dev_put(idev); 879 return -ENODEV; 880 } 881 882 for (mc = idev->mc_list; mc; mc = mc->next) { 883 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 884 mc->mca_users++; 885 write_unlock_bh(&idev->lock); 886 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 887 NULL, 0); 888 in6_dev_put(idev); 889 return 0; 890 } 891 } 892 893 /* 894 * not found: create a new one. 895 */ 896 897 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 898 899 if (mc == NULL) { 900 write_unlock_bh(&idev->lock); 901 in6_dev_put(idev); 902 return -ENOMEM; 903 } 904 905 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 906 907 ipv6_addr_copy(&mc->mca_addr, addr); 908 mc->idev = idev; 909 mc->mca_users = 1; 910 /* mca_stamp should be updated upon changes */ 911 mc->mca_cstamp = mc->mca_tstamp = jiffies; 912 atomic_set(&mc->mca_refcnt, 2); 913 spin_lock_init(&mc->mca_lock); 914 915 /* initial mode is (EX, empty) */ 916 mc->mca_sfmode = MCAST_EXCLUDE; 917 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 918 919 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 920 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 921 mc->mca_flags |= MAF_NOREPORT; 922 923 mc->next = idev->mc_list; 924 idev->mc_list = mc; 925 write_unlock_bh(&idev->lock); 926 927 mld_del_delrec(idev, &mc->mca_addr); 928 igmp6_group_added(mc); 929 ma_put(mc); 930 return 0; 931 } 932 933 /* 934 * device multicast group del 935 */ 936 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 937 { 938 struct ifmcaddr6 *ma, **map; 939 940 write_lock_bh(&idev->lock); 941 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 942 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 943 if (--ma->mca_users == 0) { 944 *map = ma->next; 945 write_unlock_bh(&idev->lock); 946 947 igmp6_group_dropped(ma); 948 949 ma_put(ma); 950 return 0; 951 } 952 write_unlock_bh(&idev->lock); 953 return 0; 954 } 955 } 956 write_unlock_bh(&idev->lock); 957 958 return -ENOENT; 959 } 960 961 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 962 { 963 struct inet6_dev *idev = in6_dev_get(dev); 964 int err; 965 966 if (!idev) 967 return -ENODEV; 968 969 err = __ipv6_dev_mc_dec(idev, addr); 970 971 in6_dev_put(idev); 972 973 return err; 974 } 975 976 /* 977 * identify MLD packets for MLD filter exceptions 978 */ 979 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 980 { 981 struct icmp6hdr *pic; 982 983 if (nexthdr != IPPROTO_ICMPV6) 984 return 0; 985 986 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 987 return 0; 988 989 pic = icmp6_hdr(skb); 990 991 switch (pic->icmp6_type) { 992 case ICMPV6_MGM_QUERY: 993 case ICMPV6_MGM_REPORT: 994 case ICMPV6_MGM_REDUCTION: 995 case ICMPV6_MLD2_REPORT: 996 return 1; 997 default: 998 break; 999 } 1000 return 0; 1001 } 1002 1003 /* 1004 * check if the interface/address pair is valid 1005 */ 1006 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1007 const struct in6_addr *src_addr) 1008 { 1009 struct inet6_dev *idev; 1010 struct ifmcaddr6 *mc; 1011 int rv = 0; 1012 1013 idev = in6_dev_get(dev); 1014 if (idev) { 1015 read_lock_bh(&idev->lock); 1016 for (mc = idev->mc_list; mc; mc=mc->next) { 1017 if (ipv6_addr_equal(&mc->mca_addr, group)) 1018 break; 1019 } 1020 if (mc) { 1021 if (src_addr && !ipv6_addr_any(src_addr)) { 1022 struct ip6_sf_list *psf; 1023 1024 spin_lock_bh(&mc->mca_lock); 1025 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1026 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1027 break; 1028 } 1029 if (psf) 1030 rv = psf->sf_count[MCAST_INCLUDE] || 1031 psf->sf_count[MCAST_EXCLUDE] != 1032 mc->mca_sfcount[MCAST_EXCLUDE]; 1033 else 1034 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1035 spin_unlock_bh(&mc->mca_lock); 1036 } else 1037 rv = 1; /* don't filter unspecified source */ 1038 } 1039 read_unlock_bh(&idev->lock); 1040 in6_dev_put(idev); 1041 } 1042 return rv; 1043 } 1044 1045 static void mld_gq_start_timer(struct inet6_dev *idev) 1046 { 1047 int tv = net_random() % idev->mc_maxdelay; 1048 1049 idev->mc_gq_running = 1; 1050 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1051 in6_dev_hold(idev); 1052 } 1053 1054 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1055 { 1056 int tv = net_random() % delay; 1057 1058 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1059 in6_dev_hold(idev); 1060 } 1061 1062 /* 1063 * IGMP handling (alias multicast ICMPv6 messages) 1064 */ 1065 1066 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1067 { 1068 unsigned long delay = resptime; 1069 1070 /* Do not start timer for these addresses */ 1071 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1072 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1073 return; 1074 1075 if (del_timer(&ma->mca_timer)) { 1076 atomic_dec(&ma->mca_refcnt); 1077 delay = ma->mca_timer.expires - jiffies; 1078 } 1079 1080 if (delay >= resptime) { 1081 if (resptime) 1082 delay = net_random() % resptime; 1083 else 1084 delay = 1; 1085 } 1086 ma->mca_timer.expires = jiffies + delay; 1087 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1088 atomic_inc(&ma->mca_refcnt); 1089 ma->mca_flags |= MAF_TIMER_RUNNING; 1090 } 1091 1092 /* mark EXCLUDE-mode sources */ 1093 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1094 struct in6_addr *srcs) 1095 { 1096 struct ip6_sf_list *psf; 1097 int i, scount; 1098 1099 scount = 0; 1100 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1101 if (scount == nsrcs) 1102 break; 1103 for (i=0; i<nsrcs; i++) { 1104 /* skip inactive filters */ 1105 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1106 pmc->mca_sfcount[MCAST_EXCLUDE] != 1107 psf->sf_count[MCAST_EXCLUDE]) 1108 continue; 1109 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1110 scount++; 1111 break; 1112 } 1113 } 1114 } 1115 pmc->mca_flags &= ~MAF_GSQUERY; 1116 if (scount == nsrcs) /* all sources excluded */ 1117 return 0; 1118 return 1; 1119 } 1120 1121 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1122 struct in6_addr *srcs) 1123 { 1124 struct ip6_sf_list *psf; 1125 int i, scount; 1126 1127 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1128 return mld_xmarksources(pmc, nsrcs, srcs); 1129 1130 /* mark INCLUDE-mode sources */ 1131 1132 scount = 0; 1133 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1134 if (scount == nsrcs) 1135 break; 1136 for (i=0; i<nsrcs; i++) { 1137 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1138 psf->sf_gsresp = 1; 1139 scount++; 1140 break; 1141 } 1142 } 1143 } 1144 if (!scount) { 1145 pmc->mca_flags &= ~MAF_GSQUERY; 1146 return 0; 1147 } 1148 pmc->mca_flags |= MAF_GSQUERY; 1149 return 1; 1150 } 1151 1152 int igmp6_event_query(struct sk_buff *skb) 1153 { 1154 struct mld2_query *mlh2 = NULL; 1155 struct ifmcaddr6 *ma; 1156 struct in6_addr *group; 1157 unsigned long max_delay; 1158 struct inet6_dev *idev; 1159 struct icmp6hdr *hdr; 1160 int group_type; 1161 int mark = 0; 1162 int len; 1163 1164 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1165 return -EINVAL; 1166 1167 /* compute payload length excluding extension headers */ 1168 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1169 len -= skb_network_header_len(skb); 1170 1171 /* Drop queries with not link local source */ 1172 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1173 return -EINVAL; 1174 1175 idev = in6_dev_get(skb->dev); 1176 1177 if (idev == NULL) 1178 return 0; 1179 1180 hdr = icmp6_hdr(skb); 1181 group = (struct in6_addr *) (hdr + 1); 1182 group_type = ipv6_addr_type(group); 1183 1184 if (group_type != IPV6_ADDR_ANY && 1185 !(group_type&IPV6_ADDR_MULTICAST)) { 1186 in6_dev_put(idev); 1187 return -EINVAL; 1188 } 1189 1190 if (len == 24) { 1191 int switchback; 1192 /* MLDv1 router present */ 1193 1194 /* Translate milliseconds to jiffies */ 1195 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1196 1197 switchback = (idev->mc_qrv + 1) * max_delay; 1198 idev->mc_v1_seen = jiffies + switchback; 1199 1200 /* cancel the interface change timer */ 1201 idev->mc_ifc_count = 0; 1202 if (del_timer(&idev->mc_ifc_timer)) 1203 __in6_dev_put(idev); 1204 /* clear deleted report items */ 1205 mld_clear_delrec(idev); 1206 } else if (len >= 28) { 1207 int srcs_offset = sizeof(struct mld2_query) - 1208 sizeof(struct icmp6hdr); 1209 if (!pskb_may_pull(skb, srcs_offset)) { 1210 in6_dev_put(idev); 1211 return -EINVAL; 1212 } 1213 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1214 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1215 if (!max_delay) 1216 max_delay = 1; 1217 idev->mc_maxdelay = max_delay; 1218 if (mlh2->qrv) 1219 idev->mc_qrv = mlh2->qrv; 1220 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1221 if (mlh2->nsrcs) { 1222 in6_dev_put(idev); 1223 return -EINVAL; /* no sources allowed */ 1224 } 1225 mld_gq_start_timer(idev); 1226 in6_dev_put(idev); 1227 return 0; 1228 } 1229 /* mark sources to include, if group & source-specific */ 1230 if (mlh2->nsrcs != 0) { 1231 if (!pskb_may_pull(skb, srcs_offset + 1232 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1233 in6_dev_put(idev); 1234 return -EINVAL; 1235 } 1236 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1237 mark = 1; 1238 } 1239 } else { 1240 in6_dev_put(idev); 1241 return -EINVAL; 1242 } 1243 1244 read_lock_bh(&idev->lock); 1245 if (group_type == IPV6_ADDR_ANY) { 1246 for (ma = idev->mc_list; ma; ma=ma->next) { 1247 spin_lock_bh(&ma->mca_lock); 1248 igmp6_group_queried(ma, max_delay); 1249 spin_unlock_bh(&ma->mca_lock); 1250 } 1251 } else { 1252 for (ma = idev->mc_list; ma; ma=ma->next) { 1253 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1254 continue; 1255 spin_lock_bh(&ma->mca_lock); 1256 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1257 /* gsquery <- gsquery && mark */ 1258 if (!mark) 1259 ma->mca_flags &= ~MAF_GSQUERY; 1260 } else { 1261 /* gsquery <- mark */ 1262 if (mark) 1263 ma->mca_flags |= MAF_GSQUERY; 1264 else 1265 ma->mca_flags &= ~MAF_GSQUERY; 1266 } 1267 if (!(ma->mca_flags & MAF_GSQUERY) || 1268 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1269 igmp6_group_queried(ma, max_delay); 1270 spin_unlock_bh(&ma->mca_lock); 1271 break; 1272 } 1273 } 1274 read_unlock_bh(&idev->lock); 1275 in6_dev_put(idev); 1276 1277 return 0; 1278 } 1279 1280 1281 int igmp6_event_report(struct sk_buff *skb) 1282 { 1283 struct ifmcaddr6 *ma; 1284 struct in6_addr *addrp; 1285 struct inet6_dev *idev; 1286 struct icmp6hdr *hdr; 1287 int addr_type; 1288 1289 /* Our own report looped back. Ignore it. */ 1290 if (skb->pkt_type == PACKET_LOOPBACK) 1291 return 0; 1292 1293 /* send our report if the MC router may not have heard this report */ 1294 if (skb->pkt_type != PACKET_MULTICAST && 1295 skb->pkt_type != PACKET_BROADCAST) 1296 return 0; 1297 1298 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1299 return -EINVAL; 1300 1301 hdr = icmp6_hdr(skb); 1302 1303 /* Drop reports with not link local source */ 1304 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1305 if (addr_type != IPV6_ADDR_ANY && 1306 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1307 return -EINVAL; 1308 1309 addrp = (struct in6_addr *) (hdr + 1); 1310 1311 idev = in6_dev_get(skb->dev); 1312 if (idev == NULL) 1313 return -ENODEV; 1314 1315 /* 1316 * Cancel the timer for this group 1317 */ 1318 1319 read_lock_bh(&idev->lock); 1320 for (ma = idev->mc_list; ma; ma=ma->next) { 1321 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1322 spin_lock(&ma->mca_lock); 1323 if (del_timer(&ma->mca_timer)) 1324 atomic_dec(&ma->mca_refcnt); 1325 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1326 spin_unlock(&ma->mca_lock); 1327 break; 1328 } 1329 } 1330 read_unlock_bh(&idev->lock); 1331 in6_dev_put(idev); 1332 return 0; 1333 } 1334 1335 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1336 int gdeleted, int sdeleted) 1337 { 1338 switch (type) { 1339 case MLD2_MODE_IS_INCLUDE: 1340 case MLD2_MODE_IS_EXCLUDE: 1341 if (gdeleted || sdeleted) 1342 return 0; 1343 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1344 if (pmc->mca_sfmode == MCAST_INCLUDE) 1345 return 1; 1346 /* don't include if this source is excluded 1347 * in all filters 1348 */ 1349 if (psf->sf_count[MCAST_INCLUDE]) 1350 return type == MLD2_MODE_IS_INCLUDE; 1351 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1352 psf->sf_count[MCAST_EXCLUDE]; 1353 } 1354 return 0; 1355 case MLD2_CHANGE_TO_INCLUDE: 1356 if (gdeleted || sdeleted) 1357 return 0; 1358 return psf->sf_count[MCAST_INCLUDE] != 0; 1359 case MLD2_CHANGE_TO_EXCLUDE: 1360 if (gdeleted || sdeleted) 1361 return 0; 1362 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1363 psf->sf_count[MCAST_INCLUDE]) 1364 return 0; 1365 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1366 psf->sf_count[MCAST_EXCLUDE]; 1367 case MLD2_ALLOW_NEW_SOURCES: 1368 if (gdeleted || !psf->sf_crcount) 1369 return 0; 1370 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1371 case MLD2_BLOCK_OLD_SOURCES: 1372 if (pmc->mca_sfmode == MCAST_INCLUDE) 1373 return gdeleted || (psf->sf_crcount && sdeleted); 1374 return psf->sf_crcount && !gdeleted && !sdeleted; 1375 } 1376 return 0; 1377 } 1378 1379 static int 1380 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1381 { 1382 struct ip6_sf_list *psf; 1383 int scount = 0; 1384 1385 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1386 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1387 continue; 1388 scount++; 1389 } 1390 return scount; 1391 } 1392 1393 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1394 { 1395 struct net *net = dev_net(dev); 1396 struct sock *sk = net->ipv6.igmp_sk; 1397 struct sk_buff *skb; 1398 struct mld2_report *pmr; 1399 struct in6_addr addr_buf; 1400 const struct in6_addr *saddr; 1401 int err; 1402 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1403 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1404 IPV6_TLV_PADN, 0 }; 1405 1406 /* we assume size > sizeof(ra) here */ 1407 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err); 1408 1409 if (!skb) 1410 return NULL; 1411 1412 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1413 1414 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1415 /* <draft-ietf-magma-mld-source-05.txt>: 1416 * use unspecified address as the source address 1417 * when a valid link-local address is not available. 1418 */ 1419 saddr = &in6addr_any; 1420 } else 1421 saddr = &addr_buf; 1422 1423 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1424 1425 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1426 1427 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1428 skb_put(skb, sizeof(*pmr)); 1429 pmr = (struct mld2_report *)skb_transport_header(skb); 1430 pmr->type = ICMPV6_MLD2_REPORT; 1431 pmr->resv1 = 0; 1432 pmr->csum = 0; 1433 pmr->resv2 = 0; 1434 pmr->ngrec = 0; 1435 return skb; 1436 } 1437 1438 static void mld_sendpack(struct sk_buff *skb) 1439 { 1440 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1441 struct mld2_report *pmr = 1442 (struct mld2_report *)skb_transport_header(skb); 1443 int payload_len, mldlen; 1444 struct inet6_dev *idev = in6_dev_get(skb->dev); 1445 struct net *net = dev_net(skb->dev); 1446 int err; 1447 struct flowi fl; 1448 1449 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); 1450 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1451 mldlen = skb->tail - skb->transport_header; 1452 pip6->payload_len = htons(payload_len); 1453 1454 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1455 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), 1456 mldlen, 0)); 1457 1458 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1459 1460 if (!skb->dst) { 1461 err = -ENOMEM; 1462 goto err_out; 1463 } 1464 1465 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT, 1466 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1467 skb->dev->ifindex); 1468 1469 err = xfrm_lookup(&skb->dst, &fl, NULL, 0); 1470 if (err) 1471 goto err_out; 1472 1473 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1474 dst_output); 1475 out: 1476 if (!err) { 1477 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT); 1478 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 1479 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS); 1480 } else 1481 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS); 1482 1483 if (likely(idev != NULL)) 1484 in6_dev_put(idev); 1485 return; 1486 1487 err_out: 1488 kfree_skb(skb); 1489 goto out; 1490 } 1491 1492 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1493 { 1494 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1495 } 1496 1497 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1498 int type, struct mld2_grec **ppgr) 1499 { 1500 struct net_device *dev = pmc->idev->dev; 1501 struct mld2_report *pmr; 1502 struct mld2_grec *pgr; 1503 1504 if (!skb) 1505 skb = mld_newpack(dev, dev->mtu); 1506 if (!skb) 1507 return NULL; 1508 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1509 pgr->grec_type = type; 1510 pgr->grec_auxwords = 0; 1511 pgr->grec_nsrcs = 0; 1512 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1513 pmr = (struct mld2_report *)skb_transport_header(skb); 1514 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1515 *ppgr = pgr; 1516 return skb; 1517 } 1518 1519 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1520 skb_tailroom(skb)) : 0) 1521 1522 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1523 int type, int gdeleted, int sdeleted) 1524 { 1525 struct net_device *dev = pmc->idev->dev; 1526 struct mld2_report *pmr; 1527 struct mld2_grec *pgr = NULL; 1528 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1529 int scount, stotal, first, isquery, truncate; 1530 1531 if (pmc->mca_flags & MAF_NOREPORT) 1532 return skb; 1533 1534 isquery = type == MLD2_MODE_IS_INCLUDE || 1535 type == MLD2_MODE_IS_EXCLUDE; 1536 truncate = type == MLD2_MODE_IS_EXCLUDE || 1537 type == MLD2_CHANGE_TO_EXCLUDE; 1538 1539 stotal = scount = 0; 1540 1541 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1542 1543 if (!*psf_list) 1544 goto empty_source; 1545 1546 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1547 1548 /* EX and TO_EX get a fresh packet, if needed */ 1549 if (truncate) { 1550 if (pmr && pmr->ngrec && 1551 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1552 if (skb) 1553 mld_sendpack(skb); 1554 skb = mld_newpack(dev, dev->mtu); 1555 } 1556 } 1557 first = 1; 1558 psf_prev = NULL; 1559 for (psf=*psf_list; psf; psf=psf_next) { 1560 struct in6_addr *psrc; 1561 1562 psf_next = psf->sf_next; 1563 1564 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1565 psf_prev = psf; 1566 continue; 1567 } 1568 1569 /* clear marks on query responses */ 1570 if (isquery) 1571 psf->sf_gsresp = 0; 1572 1573 if (AVAILABLE(skb) < sizeof(*psrc) + 1574 first*sizeof(struct mld2_grec)) { 1575 if (truncate && !first) 1576 break; /* truncate these */ 1577 if (pgr) 1578 pgr->grec_nsrcs = htons(scount); 1579 if (skb) 1580 mld_sendpack(skb); 1581 skb = mld_newpack(dev, dev->mtu); 1582 first = 1; 1583 scount = 0; 1584 } 1585 if (first) { 1586 skb = add_grhead(skb, pmc, type, &pgr); 1587 first = 0; 1588 } 1589 if (!skb) 1590 return NULL; 1591 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1592 *psrc = psf->sf_addr; 1593 scount++; stotal++; 1594 if ((type == MLD2_ALLOW_NEW_SOURCES || 1595 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1596 psf->sf_crcount--; 1597 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1598 if (psf_prev) 1599 psf_prev->sf_next = psf->sf_next; 1600 else 1601 *psf_list = psf->sf_next; 1602 kfree(psf); 1603 continue; 1604 } 1605 } 1606 psf_prev = psf; 1607 } 1608 1609 empty_source: 1610 if (!stotal) { 1611 if (type == MLD2_ALLOW_NEW_SOURCES || 1612 type == MLD2_BLOCK_OLD_SOURCES) 1613 return skb; 1614 if (pmc->mca_crcount || isquery) { 1615 /* make sure we have room for group header */ 1616 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1617 mld_sendpack(skb); 1618 skb = NULL; /* add_grhead will get a new one */ 1619 } 1620 skb = add_grhead(skb, pmc, type, &pgr); 1621 } 1622 } 1623 if (pgr) 1624 pgr->grec_nsrcs = htons(scount); 1625 1626 if (isquery) 1627 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1628 return skb; 1629 } 1630 1631 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1632 { 1633 struct sk_buff *skb = NULL; 1634 int type; 1635 1636 if (!pmc) { 1637 read_lock_bh(&idev->lock); 1638 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1639 if (pmc->mca_flags & MAF_NOREPORT) 1640 continue; 1641 spin_lock_bh(&pmc->mca_lock); 1642 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1643 type = MLD2_MODE_IS_EXCLUDE; 1644 else 1645 type = MLD2_MODE_IS_INCLUDE; 1646 skb = add_grec(skb, pmc, type, 0, 0); 1647 spin_unlock_bh(&pmc->mca_lock); 1648 } 1649 read_unlock_bh(&idev->lock); 1650 } else { 1651 spin_lock_bh(&pmc->mca_lock); 1652 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1653 type = MLD2_MODE_IS_EXCLUDE; 1654 else 1655 type = MLD2_MODE_IS_INCLUDE; 1656 skb = add_grec(skb, pmc, type, 0, 0); 1657 spin_unlock_bh(&pmc->mca_lock); 1658 } 1659 if (skb) 1660 mld_sendpack(skb); 1661 } 1662 1663 /* 1664 * remove zero-count source records from a source filter list 1665 */ 1666 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1667 { 1668 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1669 1670 psf_prev = NULL; 1671 for (psf=*ppsf; psf; psf = psf_next) { 1672 psf_next = psf->sf_next; 1673 if (psf->sf_crcount == 0) { 1674 if (psf_prev) 1675 psf_prev->sf_next = psf->sf_next; 1676 else 1677 *ppsf = psf->sf_next; 1678 kfree(psf); 1679 } else 1680 psf_prev = psf; 1681 } 1682 } 1683 1684 static void mld_send_cr(struct inet6_dev *idev) 1685 { 1686 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1687 struct sk_buff *skb = NULL; 1688 int type, dtype; 1689 1690 read_lock_bh(&idev->lock); 1691 write_lock_bh(&idev->mc_lock); 1692 1693 /* deleted MCA's */ 1694 pmc_prev = NULL; 1695 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1696 pmc_next = pmc->next; 1697 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1698 type = MLD2_BLOCK_OLD_SOURCES; 1699 dtype = MLD2_BLOCK_OLD_SOURCES; 1700 skb = add_grec(skb, pmc, type, 1, 0); 1701 skb = add_grec(skb, pmc, dtype, 1, 1); 1702 } 1703 if (pmc->mca_crcount) { 1704 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1705 type = MLD2_CHANGE_TO_INCLUDE; 1706 skb = add_grec(skb, pmc, type, 1, 0); 1707 } 1708 pmc->mca_crcount--; 1709 if (pmc->mca_crcount == 0) { 1710 mld_clear_zeros(&pmc->mca_tomb); 1711 mld_clear_zeros(&pmc->mca_sources); 1712 } 1713 } 1714 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1715 !pmc->mca_sources) { 1716 if (pmc_prev) 1717 pmc_prev->next = pmc_next; 1718 else 1719 idev->mc_tomb = pmc_next; 1720 in6_dev_put(pmc->idev); 1721 kfree(pmc); 1722 } else 1723 pmc_prev = pmc; 1724 } 1725 write_unlock_bh(&idev->mc_lock); 1726 1727 /* change recs */ 1728 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1729 spin_lock_bh(&pmc->mca_lock); 1730 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1731 type = MLD2_BLOCK_OLD_SOURCES; 1732 dtype = MLD2_ALLOW_NEW_SOURCES; 1733 } else { 1734 type = MLD2_ALLOW_NEW_SOURCES; 1735 dtype = MLD2_BLOCK_OLD_SOURCES; 1736 } 1737 skb = add_grec(skb, pmc, type, 0, 0); 1738 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1739 1740 /* filter mode changes */ 1741 if (pmc->mca_crcount) { 1742 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1743 type = MLD2_CHANGE_TO_EXCLUDE; 1744 else 1745 type = MLD2_CHANGE_TO_INCLUDE; 1746 skb = add_grec(skb, pmc, type, 0, 0); 1747 pmc->mca_crcount--; 1748 } 1749 spin_unlock_bh(&pmc->mca_lock); 1750 } 1751 read_unlock_bh(&idev->lock); 1752 if (!skb) 1753 return; 1754 (void) mld_sendpack(skb); 1755 } 1756 1757 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1758 { 1759 struct net *net = dev_net(dev); 1760 struct sock *sk = net->ipv6.igmp_sk; 1761 struct inet6_dev *idev; 1762 struct sk_buff *skb; 1763 struct icmp6hdr *hdr; 1764 const struct in6_addr *snd_addr, *saddr; 1765 struct in6_addr *addrp; 1766 struct in6_addr addr_buf; 1767 int err, len, payload_len, full_len; 1768 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1769 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1770 IPV6_TLV_PADN, 0 }; 1771 struct flowi fl; 1772 1773 rcu_read_lock(); 1774 IP6_INC_STATS(__in6_dev_get(dev), 1775 IPSTATS_MIB_OUTREQUESTS); 1776 rcu_read_unlock(); 1777 if (type == ICMPV6_MGM_REDUCTION) 1778 snd_addr = &in6addr_linklocal_allrouters; 1779 else 1780 snd_addr = addr; 1781 1782 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1783 payload_len = len + sizeof(ra); 1784 full_len = sizeof(struct ipv6hdr) + payload_len; 1785 1786 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err); 1787 1788 if (skb == NULL) { 1789 rcu_read_lock(); 1790 IP6_INC_STATS(__in6_dev_get(dev), 1791 IPSTATS_MIB_OUTDISCARDS); 1792 rcu_read_unlock(); 1793 return; 1794 } 1795 1796 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1797 1798 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1799 /* <draft-ietf-magma-mld-source-05.txt>: 1800 * use unspecified address as the source address 1801 * when a valid link-local address is not available. 1802 */ 1803 saddr = &in6addr_any; 1804 } else 1805 saddr = &addr_buf; 1806 1807 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1808 1809 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1810 1811 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1812 memset(hdr, 0, sizeof(struct icmp6hdr)); 1813 hdr->icmp6_type = type; 1814 1815 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1816 ipv6_addr_copy(addrp, addr); 1817 1818 hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1819 IPPROTO_ICMPV6, 1820 csum_partial((__u8 *) hdr, len, 0)); 1821 1822 idev = in6_dev_get(skb->dev); 1823 1824 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1825 if (!skb->dst) { 1826 err = -ENOMEM; 1827 goto err_out; 1828 } 1829 1830 icmpv6_flow_init(sk, &fl, type, 1831 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1832 skb->dev->ifindex); 1833 1834 err = xfrm_lookup(&skb->dst, &fl, NULL, 0); 1835 if (err) 1836 goto err_out; 1837 1838 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1839 dst_output); 1840 out: 1841 if (!err) { 1842 ICMP6MSGOUT_INC_STATS(idev, type); 1843 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1844 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); 1845 } else 1846 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); 1847 1848 if (likely(idev != NULL)) 1849 in6_dev_put(idev); 1850 return; 1851 1852 err_out: 1853 kfree_skb(skb); 1854 goto out; 1855 } 1856 1857 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1858 struct in6_addr *psfsrc) 1859 { 1860 struct ip6_sf_list *psf, *psf_prev; 1861 int rv = 0; 1862 1863 psf_prev = NULL; 1864 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1865 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1866 break; 1867 psf_prev = psf; 1868 } 1869 if (!psf || psf->sf_count[sfmode] == 0) { 1870 /* source filter not found, or count wrong => bug */ 1871 return -ESRCH; 1872 } 1873 psf->sf_count[sfmode]--; 1874 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1875 struct inet6_dev *idev = pmc->idev; 1876 1877 /* no more filters for this source */ 1878 if (psf_prev) 1879 psf_prev->sf_next = psf->sf_next; 1880 else 1881 pmc->mca_sources = psf->sf_next; 1882 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1883 !MLD_V1_SEEN(idev)) { 1884 psf->sf_crcount = idev->mc_qrv; 1885 psf->sf_next = pmc->mca_tomb; 1886 pmc->mca_tomb = psf; 1887 rv = 1; 1888 } else 1889 kfree(psf); 1890 } 1891 return rv; 1892 } 1893 1894 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1895 int sfmode, int sfcount, struct in6_addr *psfsrc, 1896 int delta) 1897 { 1898 struct ifmcaddr6 *pmc; 1899 int changerec = 0; 1900 int i, err; 1901 1902 if (!idev) 1903 return -ENODEV; 1904 read_lock_bh(&idev->lock); 1905 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1906 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1907 break; 1908 } 1909 if (!pmc) { 1910 /* MCA not found?? bug */ 1911 read_unlock_bh(&idev->lock); 1912 return -ESRCH; 1913 } 1914 spin_lock_bh(&pmc->mca_lock); 1915 sf_markstate(pmc); 1916 if (!delta) { 1917 if (!pmc->mca_sfcount[sfmode]) { 1918 spin_unlock_bh(&pmc->mca_lock); 1919 read_unlock_bh(&idev->lock); 1920 return -EINVAL; 1921 } 1922 pmc->mca_sfcount[sfmode]--; 1923 } 1924 err = 0; 1925 for (i=0; i<sfcount; i++) { 1926 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1927 1928 changerec |= rv > 0; 1929 if (!err && rv < 0) 1930 err = rv; 1931 } 1932 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1933 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1934 pmc->mca_sfcount[MCAST_INCLUDE]) { 1935 struct ip6_sf_list *psf; 1936 1937 /* filter mode change */ 1938 pmc->mca_sfmode = MCAST_INCLUDE; 1939 pmc->mca_crcount = idev->mc_qrv; 1940 idev->mc_ifc_count = pmc->mca_crcount; 1941 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1942 psf->sf_crcount = 0; 1943 mld_ifc_event(pmc->idev); 1944 } else if (sf_setstate(pmc) || changerec) 1945 mld_ifc_event(pmc->idev); 1946 spin_unlock_bh(&pmc->mca_lock); 1947 read_unlock_bh(&idev->lock); 1948 return err; 1949 } 1950 1951 /* 1952 * Add multicast single-source filter to the interface list 1953 */ 1954 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1955 struct in6_addr *psfsrc, int delta) 1956 { 1957 struct ip6_sf_list *psf, *psf_prev; 1958 1959 psf_prev = NULL; 1960 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1961 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1962 break; 1963 psf_prev = psf; 1964 } 1965 if (!psf) { 1966 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1967 if (!psf) 1968 return -ENOBUFS; 1969 1970 psf->sf_addr = *psfsrc; 1971 if (psf_prev) { 1972 psf_prev->sf_next = psf; 1973 } else 1974 pmc->mca_sources = psf; 1975 } 1976 psf->sf_count[sfmode]++; 1977 return 0; 1978 } 1979 1980 static void sf_markstate(struct ifmcaddr6 *pmc) 1981 { 1982 struct ip6_sf_list *psf; 1983 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1984 1985 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1986 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1987 psf->sf_oldin = mca_xcount == 1988 psf->sf_count[MCAST_EXCLUDE] && 1989 !psf->sf_count[MCAST_INCLUDE]; 1990 } else 1991 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1992 } 1993 1994 static int sf_setstate(struct ifmcaddr6 *pmc) 1995 { 1996 struct ip6_sf_list *psf, *dpsf; 1997 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1998 int qrv = pmc->idev->mc_qrv; 1999 int new_in, rv; 2000 2001 rv = 0; 2002 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2003 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2004 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2005 !psf->sf_count[MCAST_INCLUDE]; 2006 } else 2007 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2008 if (new_in) { 2009 if (!psf->sf_oldin) { 2010 struct ip6_sf_list *prev = NULL; 2011 2012 for (dpsf=pmc->mca_tomb; dpsf; 2013 dpsf=dpsf->sf_next) { 2014 if (ipv6_addr_equal(&dpsf->sf_addr, 2015 &psf->sf_addr)) 2016 break; 2017 prev = dpsf; 2018 } 2019 if (dpsf) { 2020 if (prev) 2021 prev->sf_next = dpsf->sf_next; 2022 else 2023 pmc->mca_tomb = dpsf->sf_next; 2024 kfree(dpsf); 2025 } 2026 psf->sf_crcount = qrv; 2027 rv++; 2028 } 2029 } else if (psf->sf_oldin) { 2030 psf->sf_crcount = 0; 2031 /* 2032 * add or update "delete" records if an active filter 2033 * is now inactive 2034 */ 2035 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2036 if (ipv6_addr_equal(&dpsf->sf_addr, 2037 &psf->sf_addr)) 2038 break; 2039 if (!dpsf) { 2040 dpsf = (struct ip6_sf_list *) 2041 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2042 if (!dpsf) 2043 continue; 2044 *dpsf = *psf; 2045 /* pmc->mca_lock held by callers */ 2046 dpsf->sf_next = pmc->mca_tomb; 2047 pmc->mca_tomb = dpsf; 2048 } 2049 dpsf->sf_crcount = qrv; 2050 rv++; 2051 } 2052 } 2053 return rv; 2054 } 2055 2056 /* 2057 * Add multicast source filter list to the interface list 2058 */ 2059 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2060 int sfmode, int sfcount, struct in6_addr *psfsrc, 2061 int delta) 2062 { 2063 struct ifmcaddr6 *pmc; 2064 int isexclude; 2065 int i, err; 2066 2067 if (!idev) 2068 return -ENODEV; 2069 read_lock_bh(&idev->lock); 2070 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2071 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2072 break; 2073 } 2074 if (!pmc) { 2075 /* MCA not found?? bug */ 2076 read_unlock_bh(&idev->lock); 2077 return -ESRCH; 2078 } 2079 spin_lock_bh(&pmc->mca_lock); 2080 2081 sf_markstate(pmc); 2082 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2083 if (!delta) 2084 pmc->mca_sfcount[sfmode]++; 2085 err = 0; 2086 for (i=0; i<sfcount; i++) { 2087 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2088 if (err) 2089 break; 2090 } 2091 if (err) { 2092 int j; 2093 2094 if (!delta) 2095 pmc->mca_sfcount[sfmode]--; 2096 for (j=0; j<i; j++) 2097 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2098 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2099 struct inet6_dev *idev = pmc->idev; 2100 struct ip6_sf_list *psf; 2101 2102 /* filter mode change */ 2103 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2104 pmc->mca_sfmode = MCAST_EXCLUDE; 2105 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2106 pmc->mca_sfmode = MCAST_INCLUDE; 2107 /* else no filters; keep old mode for reports */ 2108 2109 pmc->mca_crcount = idev->mc_qrv; 2110 idev->mc_ifc_count = pmc->mca_crcount; 2111 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2112 psf->sf_crcount = 0; 2113 mld_ifc_event(idev); 2114 } else if (sf_setstate(pmc)) 2115 mld_ifc_event(idev); 2116 spin_unlock_bh(&pmc->mca_lock); 2117 read_unlock_bh(&idev->lock); 2118 return err; 2119 } 2120 2121 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2122 { 2123 struct ip6_sf_list *psf, *nextpsf; 2124 2125 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2126 nextpsf = psf->sf_next; 2127 kfree(psf); 2128 } 2129 pmc->mca_tomb = NULL; 2130 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2131 nextpsf = psf->sf_next; 2132 kfree(psf); 2133 } 2134 pmc->mca_sources = NULL; 2135 pmc->mca_sfmode = MCAST_EXCLUDE; 2136 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2137 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2138 } 2139 2140 2141 static void igmp6_join_group(struct ifmcaddr6 *ma) 2142 { 2143 unsigned long delay; 2144 2145 if (ma->mca_flags & MAF_NOREPORT) 2146 return; 2147 2148 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2149 2150 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2151 2152 spin_lock_bh(&ma->mca_lock); 2153 if (del_timer(&ma->mca_timer)) { 2154 atomic_dec(&ma->mca_refcnt); 2155 delay = ma->mca_timer.expires - jiffies; 2156 } 2157 2158 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2159 atomic_inc(&ma->mca_refcnt); 2160 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2161 spin_unlock_bh(&ma->mca_lock); 2162 } 2163 2164 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2165 struct inet6_dev *idev) 2166 { 2167 int err; 2168 2169 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2170 * so no other readers or writers of iml or its sflist 2171 */ 2172 if (!iml->sflist) { 2173 /* any-source empty exclude case */ 2174 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2175 } 2176 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2177 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2178 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2179 iml->sflist = NULL; 2180 return err; 2181 } 2182 2183 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2184 { 2185 if (MLD_V1_SEEN(ma->idev)) { 2186 if (ma->mca_flags & MAF_LAST_REPORTER) 2187 igmp6_send(&ma->mca_addr, ma->idev->dev, 2188 ICMPV6_MGM_REDUCTION); 2189 } else { 2190 mld_add_delrec(ma->idev, ma); 2191 mld_ifc_event(ma->idev); 2192 } 2193 } 2194 2195 static void mld_gq_timer_expire(unsigned long data) 2196 { 2197 struct inet6_dev *idev = (struct inet6_dev *)data; 2198 2199 idev->mc_gq_running = 0; 2200 mld_send_report(idev, NULL); 2201 __in6_dev_put(idev); 2202 } 2203 2204 static void mld_ifc_timer_expire(unsigned long data) 2205 { 2206 struct inet6_dev *idev = (struct inet6_dev *)data; 2207 2208 mld_send_cr(idev); 2209 if (idev->mc_ifc_count) { 2210 idev->mc_ifc_count--; 2211 if (idev->mc_ifc_count) 2212 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2213 } 2214 __in6_dev_put(idev); 2215 } 2216 2217 static void mld_ifc_event(struct inet6_dev *idev) 2218 { 2219 if (MLD_V1_SEEN(idev)) 2220 return; 2221 idev->mc_ifc_count = idev->mc_qrv; 2222 mld_ifc_start_timer(idev, 1); 2223 } 2224 2225 2226 static void igmp6_timer_handler(unsigned long data) 2227 { 2228 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2229 2230 if (MLD_V1_SEEN(ma->idev)) 2231 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2232 else 2233 mld_send_report(ma->idev, ma); 2234 2235 spin_lock(&ma->mca_lock); 2236 ma->mca_flags |= MAF_LAST_REPORTER; 2237 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2238 spin_unlock(&ma->mca_lock); 2239 ma_put(ma); 2240 } 2241 2242 /* Device going down */ 2243 2244 void ipv6_mc_down(struct inet6_dev *idev) 2245 { 2246 struct ifmcaddr6 *i; 2247 2248 /* Withdraw multicast list */ 2249 2250 read_lock_bh(&idev->lock); 2251 idev->mc_ifc_count = 0; 2252 if (del_timer(&idev->mc_ifc_timer)) 2253 __in6_dev_put(idev); 2254 idev->mc_gq_running = 0; 2255 if (del_timer(&idev->mc_gq_timer)) 2256 __in6_dev_put(idev); 2257 2258 for (i = idev->mc_list; i; i=i->next) 2259 igmp6_group_dropped(i); 2260 read_unlock_bh(&idev->lock); 2261 2262 mld_clear_delrec(idev); 2263 } 2264 2265 2266 /* Device going up */ 2267 2268 void ipv6_mc_up(struct inet6_dev *idev) 2269 { 2270 struct ifmcaddr6 *i; 2271 2272 /* Install multicast list, except for all-nodes (already installed) */ 2273 2274 read_lock_bh(&idev->lock); 2275 for (i = idev->mc_list; i; i=i->next) 2276 igmp6_group_added(i); 2277 read_unlock_bh(&idev->lock); 2278 } 2279 2280 /* IPv6 device initialization. */ 2281 2282 void ipv6_mc_init_dev(struct inet6_dev *idev) 2283 { 2284 write_lock_bh(&idev->lock); 2285 rwlock_init(&idev->mc_lock); 2286 idev->mc_gq_running = 0; 2287 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2288 (unsigned long)idev); 2289 idev->mc_tomb = NULL; 2290 idev->mc_ifc_count = 0; 2291 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2292 (unsigned long)idev); 2293 idev->mc_qrv = MLD_QRV_DEFAULT; 2294 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2295 idev->mc_v1_seen = 0; 2296 write_unlock_bh(&idev->lock); 2297 } 2298 2299 /* 2300 * Device is about to be destroyed: clean up. 2301 */ 2302 2303 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2304 { 2305 struct ifmcaddr6 *i; 2306 2307 /* Deactivate timers */ 2308 ipv6_mc_down(idev); 2309 2310 /* Delete all-nodes address. */ 2311 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2312 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2313 * fail. 2314 */ 2315 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2316 2317 if (idev->cnf.forwarding) 2318 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2319 2320 write_lock_bh(&idev->lock); 2321 while ((i = idev->mc_list) != NULL) { 2322 idev->mc_list = i->next; 2323 write_unlock_bh(&idev->lock); 2324 2325 igmp6_group_dropped(i); 2326 ma_put(i); 2327 2328 write_lock_bh(&idev->lock); 2329 } 2330 write_unlock_bh(&idev->lock); 2331 } 2332 2333 #ifdef CONFIG_PROC_FS 2334 struct igmp6_mc_iter_state { 2335 struct seq_net_private p; 2336 struct net_device *dev; 2337 struct inet6_dev *idev; 2338 }; 2339 2340 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2341 2342 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2343 { 2344 struct ifmcaddr6 *im = NULL; 2345 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2346 struct net *net = seq_file_net(seq); 2347 2348 state->idev = NULL; 2349 for_each_netdev(net, state->dev) { 2350 struct inet6_dev *idev; 2351 idev = in6_dev_get(state->dev); 2352 if (!idev) 2353 continue; 2354 read_lock_bh(&idev->lock); 2355 im = idev->mc_list; 2356 if (im) { 2357 state->idev = idev; 2358 break; 2359 } 2360 read_unlock_bh(&idev->lock); 2361 in6_dev_put(idev); 2362 } 2363 return im; 2364 } 2365 2366 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2367 { 2368 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2369 2370 im = im->next; 2371 while (!im) { 2372 if (likely(state->idev != NULL)) { 2373 read_unlock_bh(&state->idev->lock); 2374 in6_dev_put(state->idev); 2375 } 2376 state->dev = next_net_device(state->dev); 2377 if (!state->dev) { 2378 state->idev = NULL; 2379 break; 2380 } 2381 state->idev = in6_dev_get(state->dev); 2382 if (!state->idev) 2383 continue; 2384 read_lock_bh(&state->idev->lock); 2385 im = state->idev->mc_list; 2386 } 2387 return im; 2388 } 2389 2390 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2391 { 2392 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2393 if (im) 2394 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2395 --pos; 2396 return pos ? NULL : im; 2397 } 2398 2399 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2400 __acquires(dev_base_lock) 2401 { 2402 read_lock(&dev_base_lock); 2403 return igmp6_mc_get_idx(seq, *pos); 2404 } 2405 2406 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2407 { 2408 struct ifmcaddr6 *im; 2409 im = igmp6_mc_get_next(seq, v); 2410 ++*pos; 2411 return im; 2412 } 2413 2414 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2415 __releases(dev_base_lock) 2416 { 2417 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2418 if (likely(state->idev != NULL)) { 2419 read_unlock_bh(&state->idev->lock); 2420 in6_dev_put(state->idev); 2421 state->idev = NULL; 2422 } 2423 state->dev = NULL; 2424 read_unlock(&dev_base_lock); 2425 } 2426 2427 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2428 { 2429 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2430 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2431 2432 seq_printf(seq, 2433 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2434 state->dev->ifindex, state->dev->name, 2435 NIP6(im->mca_addr), 2436 im->mca_users, im->mca_flags, 2437 (im->mca_flags&MAF_TIMER_RUNNING) ? 2438 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2439 return 0; 2440 } 2441 2442 static const struct seq_operations igmp6_mc_seq_ops = { 2443 .start = igmp6_mc_seq_start, 2444 .next = igmp6_mc_seq_next, 2445 .stop = igmp6_mc_seq_stop, 2446 .show = igmp6_mc_seq_show, 2447 }; 2448 2449 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2450 { 2451 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2452 sizeof(struct igmp6_mc_iter_state)); 2453 } 2454 2455 static const struct file_operations igmp6_mc_seq_fops = { 2456 .owner = THIS_MODULE, 2457 .open = igmp6_mc_seq_open, 2458 .read = seq_read, 2459 .llseek = seq_lseek, 2460 .release = seq_release_net, 2461 }; 2462 2463 struct igmp6_mcf_iter_state { 2464 struct seq_net_private p; 2465 struct net_device *dev; 2466 struct inet6_dev *idev; 2467 struct ifmcaddr6 *im; 2468 }; 2469 2470 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2471 2472 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2473 { 2474 struct ip6_sf_list *psf = NULL; 2475 struct ifmcaddr6 *im = NULL; 2476 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2477 struct net *net = seq_file_net(seq); 2478 2479 state->idev = NULL; 2480 state->im = NULL; 2481 for_each_netdev(net, state->dev) { 2482 struct inet6_dev *idev; 2483 idev = in6_dev_get(state->dev); 2484 if (unlikely(idev == NULL)) 2485 continue; 2486 read_lock_bh(&idev->lock); 2487 im = idev->mc_list; 2488 if (likely(im != NULL)) { 2489 spin_lock_bh(&im->mca_lock); 2490 psf = im->mca_sources; 2491 if (likely(psf != NULL)) { 2492 state->im = im; 2493 state->idev = idev; 2494 break; 2495 } 2496 spin_unlock_bh(&im->mca_lock); 2497 } 2498 read_unlock_bh(&idev->lock); 2499 in6_dev_put(idev); 2500 } 2501 return psf; 2502 } 2503 2504 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2505 { 2506 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2507 2508 psf = psf->sf_next; 2509 while (!psf) { 2510 spin_unlock_bh(&state->im->mca_lock); 2511 state->im = state->im->next; 2512 while (!state->im) { 2513 if (likely(state->idev != NULL)) { 2514 read_unlock_bh(&state->idev->lock); 2515 in6_dev_put(state->idev); 2516 } 2517 state->dev = next_net_device(state->dev); 2518 if (!state->dev) { 2519 state->idev = NULL; 2520 goto out; 2521 } 2522 state->idev = in6_dev_get(state->dev); 2523 if (!state->idev) 2524 continue; 2525 read_lock_bh(&state->idev->lock); 2526 state->im = state->idev->mc_list; 2527 } 2528 if (!state->im) 2529 break; 2530 spin_lock_bh(&state->im->mca_lock); 2531 psf = state->im->mca_sources; 2532 } 2533 out: 2534 return psf; 2535 } 2536 2537 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2538 { 2539 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2540 if (psf) 2541 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2542 --pos; 2543 return pos ? NULL : psf; 2544 } 2545 2546 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2547 __acquires(dev_base_lock) 2548 { 2549 read_lock(&dev_base_lock); 2550 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2551 } 2552 2553 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2554 { 2555 struct ip6_sf_list *psf; 2556 if (v == SEQ_START_TOKEN) 2557 psf = igmp6_mcf_get_first(seq); 2558 else 2559 psf = igmp6_mcf_get_next(seq, v); 2560 ++*pos; 2561 return psf; 2562 } 2563 2564 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2565 __releases(dev_base_lock) 2566 { 2567 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2568 if (likely(state->im != NULL)) { 2569 spin_unlock_bh(&state->im->mca_lock); 2570 state->im = NULL; 2571 } 2572 if (likely(state->idev != NULL)) { 2573 read_unlock_bh(&state->idev->lock); 2574 in6_dev_put(state->idev); 2575 state->idev = NULL; 2576 } 2577 state->dev = NULL; 2578 read_unlock(&dev_base_lock); 2579 } 2580 2581 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2582 { 2583 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2584 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2585 2586 if (v == SEQ_START_TOKEN) { 2587 seq_printf(seq, 2588 "%3s %6s " 2589 "%32s %32s %6s %6s\n", "Idx", 2590 "Device", "Multicast Address", 2591 "Source Address", "INC", "EXC"); 2592 } else { 2593 seq_printf(seq, 2594 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n", 2595 state->dev->ifindex, state->dev->name, 2596 NIP6(state->im->mca_addr), 2597 NIP6(psf->sf_addr), 2598 psf->sf_count[MCAST_INCLUDE], 2599 psf->sf_count[MCAST_EXCLUDE]); 2600 } 2601 return 0; 2602 } 2603 2604 static const struct seq_operations igmp6_mcf_seq_ops = { 2605 .start = igmp6_mcf_seq_start, 2606 .next = igmp6_mcf_seq_next, 2607 .stop = igmp6_mcf_seq_stop, 2608 .show = igmp6_mcf_seq_show, 2609 }; 2610 2611 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2612 { 2613 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2614 sizeof(struct igmp6_mcf_iter_state)); 2615 } 2616 2617 static const struct file_operations igmp6_mcf_seq_fops = { 2618 .owner = THIS_MODULE, 2619 .open = igmp6_mcf_seq_open, 2620 .read = seq_read, 2621 .llseek = seq_lseek, 2622 .release = seq_release_net, 2623 }; 2624 2625 static int igmp6_proc_init(struct net *net) 2626 { 2627 int err; 2628 2629 err = -ENOMEM; 2630 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2631 goto out; 2632 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2633 &igmp6_mcf_seq_fops)) 2634 goto out_proc_net_igmp6; 2635 2636 err = 0; 2637 out: 2638 return err; 2639 2640 out_proc_net_igmp6: 2641 proc_net_remove(net, "igmp6"); 2642 goto out; 2643 } 2644 2645 static void igmp6_proc_exit(struct net *net) 2646 { 2647 proc_net_remove(net, "mcfilter6"); 2648 proc_net_remove(net, "igmp6"); 2649 } 2650 #else 2651 static int igmp6_proc_init(struct net *net) 2652 { 2653 return 0; 2654 } 2655 static void igmp6_proc_exit(struct net *net) 2656 { 2657 ; 2658 } 2659 #endif 2660 2661 static int igmp6_net_init(struct net *net) 2662 { 2663 int err; 2664 2665 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2666 SOCK_RAW, IPPROTO_ICMPV6, net); 2667 if (err < 0) { 2668 printk(KERN_ERR 2669 "Failed to initialize the IGMP6 control socket (err %d).\n", 2670 err); 2671 goto out; 2672 } 2673 2674 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2675 2676 err = igmp6_proc_init(net); 2677 if (err) 2678 goto out_sock_create; 2679 out: 2680 return err; 2681 2682 out_sock_create: 2683 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2684 goto out; 2685 } 2686 2687 static void igmp6_net_exit(struct net *net) 2688 { 2689 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2690 igmp6_proc_exit(net); 2691 } 2692 2693 static struct pernet_operations igmp6_net_ops = { 2694 .init = igmp6_net_init, 2695 .exit = igmp6_net_exit, 2696 }; 2697 2698 int __init igmp6_init(void) 2699 { 2700 return register_pernet_subsys(&igmp6_net_ops); 2701 } 2702 2703 void igmp6_cleanup(void) 2704 { 2705 unregister_pernet_subsys(&igmp6_net_ops); 2706 } 2707