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 goto nodev; 307 idev = in6_dev_get(dev); 308 if (!idev) 309 goto release; 310 read_lock_bh(&idev->lock); 311 if (idev->dead) 312 goto unlock_release; 313 314 return idev; 315 316 unlock_release: 317 read_unlock_bh(&idev->lock); 318 in6_dev_put(idev); 319 release: 320 dev_put(dev); 321 nodev: 322 return NULL; 323 } 324 325 void ipv6_sock_mc_close(struct sock *sk) 326 { 327 struct ipv6_pinfo *np = inet6_sk(sk); 328 struct ipv6_mc_socklist *mc_lst; 329 struct net *net = sock_net(sk); 330 331 write_lock_bh(&ipv6_sk_mc_lock); 332 while ((mc_lst = np->ipv6_mc_list) != NULL) { 333 struct net_device *dev; 334 335 np->ipv6_mc_list = mc_lst->next; 336 write_unlock_bh(&ipv6_sk_mc_lock); 337 338 dev = dev_get_by_index(net, mc_lst->ifindex); 339 if (dev) { 340 struct inet6_dev *idev = in6_dev_get(dev); 341 342 (void) ip6_mc_leave_src(sk, mc_lst, idev); 343 if (idev) { 344 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 345 in6_dev_put(idev); 346 } 347 dev_put(dev); 348 } else 349 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 350 351 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 352 353 write_lock_bh(&ipv6_sk_mc_lock); 354 } 355 write_unlock_bh(&ipv6_sk_mc_lock); 356 } 357 358 int ip6_mc_source(int add, int omode, struct sock *sk, 359 struct group_source_req *pgsr) 360 { 361 struct in6_addr *source, *group; 362 struct ipv6_mc_socklist *pmc; 363 struct net_device *dev; 364 struct inet6_dev *idev; 365 struct ipv6_pinfo *inet6 = inet6_sk(sk); 366 struct ip6_sf_socklist *psl; 367 struct net *net = sock_net(sk); 368 int i, j, rv; 369 int leavegroup = 0; 370 int pmclocked = 0; 371 int err; 372 373 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 374 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 375 376 if (!ipv6_addr_is_multicast(group)) 377 return -EINVAL; 378 379 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface); 380 if (!idev) 381 return -ENODEV; 382 dev = idev->dev; 383 384 err = -EADDRNOTAVAIL; 385 386 read_lock_bh(&ipv6_sk_mc_lock); 387 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 389 continue; 390 if (ipv6_addr_equal(&pmc->addr, group)) 391 break; 392 } 393 if (!pmc) { /* must have a prior join */ 394 err = -EINVAL; 395 goto done; 396 } 397 /* if a source filter was set, must be the same mode as before */ 398 if (pmc->sflist) { 399 if (pmc->sfmode != omode) { 400 err = -EINVAL; 401 goto done; 402 } 403 } else if (pmc->sfmode != omode) { 404 /* allow mode switches for empty-set filters */ 405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 407 pmc->sfmode = omode; 408 } 409 410 write_lock_bh(&pmc->sflock); 411 pmclocked = 1; 412 413 psl = pmc->sflist; 414 if (!add) { 415 if (!psl) 416 goto done; /* err = -EADDRNOTAVAIL */ 417 rv = !0; 418 for (i=0; i<psl->sl_count; i++) { 419 rv = memcmp(&psl->sl_addr[i], source, 420 sizeof(struct in6_addr)); 421 if (rv == 0) 422 break; 423 } 424 if (rv) /* source not found */ 425 goto done; /* err = -EADDRNOTAVAIL */ 426 427 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 428 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 429 leavegroup = 1; 430 goto done; 431 } 432 433 /* update the interface filter */ 434 ip6_mc_del_src(idev, group, omode, 1, source, 1); 435 436 for (j=i+1; j<psl->sl_count; j++) 437 psl->sl_addr[j-1] = psl->sl_addr[j]; 438 psl->sl_count--; 439 err = 0; 440 goto done; 441 } 442 /* else, add a new source to the filter */ 443 444 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 445 err = -ENOBUFS; 446 goto done; 447 } 448 if (!psl || psl->sl_count == psl->sl_max) { 449 struct ip6_sf_socklist *newpsl; 450 int count = IP6_SFBLOCK; 451 452 if (psl) 453 count += psl->sl_max; 454 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 455 if (!newpsl) { 456 err = -ENOBUFS; 457 goto done; 458 } 459 newpsl->sl_max = count; 460 newpsl->sl_count = count - IP6_SFBLOCK; 461 if (psl) { 462 for (i=0; i<psl->sl_count; i++) 463 newpsl->sl_addr[i] = psl->sl_addr[i]; 464 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 465 } 466 pmc->sflist = psl = newpsl; 467 } 468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 469 for (i=0; i<psl->sl_count; i++) { 470 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 471 if (rv == 0) 472 break; 473 } 474 if (rv == 0) /* address already there is an error */ 475 goto done; 476 for (j=psl->sl_count-1; j>=i; j--) 477 psl->sl_addr[j+1] = psl->sl_addr[j]; 478 psl->sl_addr[i] = *source; 479 psl->sl_count++; 480 err = 0; 481 /* update the interface list */ 482 ip6_mc_add_src(idev, group, omode, 1, source, 1); 483 done: 484 if (pmclocked) 485 write_unlock_bh(&pmc->sflock); 486 read_unlock_bh(&ipv6_sk_mc_lock); 487 read_unlock_bh(&idev->lock); 488 in6_dev_put(idev); 489 dev_put(dev); 490 if (leavegroup) 491 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 492 return err; 493 } 494 495 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 496 { 497 struct in6_addr *group; 498 struct ipv6_mc_socklist *pmc; 499 struct net_device *dev; 500 struct inet6_dev *idev; 501 struct ipv6_pinfo *inet6 = inet6_sk(sk); 502 struct ip6_sf_socklist *newpsl, *psl; 503 struct net *net = sock_net(sk); 504 int leavegroup = 0; 505 int i, err; 506 507 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 508 509 if (!ipv6_addr_is_multicast(group)) 510 return -EINVAL; 511 if (gsf->gf_fmode != MCAST_INCLUDE && 512 gsf->gf_fmode != MCAST_EXCLUDE) 513 return -EINVAL; 514 515 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 516 517 if (!idev) 518 return -ENODEV; 519 dev = idev->dev; 520 521 err = 0; 522 read_lock_bh(&ipv6_sk_mc_lock); 523 524 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 525 leavegroup = 1; 526 goto done; 527 } 528 529 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 530 if (pmc->ifindex != gsf->gf_interface) 531 continue; 532 if (ipv6_addr_equal(&pmc->addr, group)) 533 break; 534 } 535 if (!pmc) { /* must have a prior join */ 536 err = -EINVAL; 537 goto done; 538 } 539 if (gsf->gf_numsrc) { 540 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 541 GFP_ATOMIC); 542 if (!newpsl) { 543 err = -ENOBUFS; 544 goto done; 545 } 546 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 547 for (i=0; i<newpsl->sl_count; ++i) { 548 struct sockaddr_in6 *psin6; 549 550 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 551 newpsl->sl_addr[i] = psin6->sin6_addr; 552 } 553 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 554 newpsl->sl_count, newpsl->sl_addr, 0); 555 if (err) { 556 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 557 goto done; 558 } 559 } else { 560 newpsl = NULL; 561 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 562 } 563 564 write_lock_bh(&pmc->sflock); 565 psl = pmc->sflist; 566 if (psl) { 567 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 568 psl->sl_count, psl->sl_addr, 0); 569 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 570 } else 571 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 572 pmc->sflist = newpsl; 573 pmc->sfmode = gsf->gf_fmode; 574 write_unlock_bh(&pmc->sflock); 575 err = 0; 576 done: 577 read_unlock_bh(&ipv6_sk_mc_lock); 578 read_unlock_bh(&idev->lock); 579 in6_dev_put(idev); 580 dev_put(dev); 581 if (leavegroup) 582 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 583 return err; 584 } 585 586 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 587 struct group_filter __user *optval, int __user *optlen) 588 { 589 int err, i, count, copycount; 590 struct in6_addr *group; 591 struct ipv6_mc_socklist *pmc; 592 struct inet6_dev *idev; 593 struct net_device *dev; 594 struct ipv6_pinfo *inet6 = inet6_sk(sk); 595 struct ip6_sf_socklist *psl; 596 struct net *net = sock_net(sk); 597 598 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 599 600 if (!ipv6_addr_is_multicast(group)) 601 return -EINVAL; 602 603 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 604 605 if (!idev) 606 return -ENODEV; 607 608 dev = idev->dev; 609 610 err = -EADDRNOTAVAIL; 611 /* 612 * changes to the ipv6_mc_list require the socket lock and 613 * a read lock on ip6_sk_mc_lock. We have the socket lock, 614 * so reading the list is safe. 615 */ 616 617 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 618 if (pmc->ifindex != gsf->gf_interface) 619 continue; 620 if (ipv6_addr_equal(group, &pmc->addr)) 621 break; 622 } 623 if (!pmc) /* must have a prior join */ 624 goto done; 625 gsf->gf_fmode = pmc->sfmode; 626 psl = pmc->sflist; 627 count = psl ? psl->sl_count : 0; 628 read_unlock_bh(&idev->lock); 629 in6_dev_put(idev); 630 dev_put(dev); 631 632 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 633 gsf->gf_numsrc = count; 634 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 635 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 636 return -EFAULT; 637 } 638 /* changes to psl require the socket lock, a read lock on 639 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 640 * have the socket lock, so reading here is safe. 641 */ 642 for (i=0; i<copycount; i++) { 643 struct sockaddr_in6 *psin6; 644 struct sockaddr_storage ss; 645 646 psin6 = (struct sockaddr_in6 *)&ss; 647 memset(&ss, 0, sizeof(ss)); 648 psin6->sin6_family = AF_INET6; 649 psin6->sin6_addr = psl->sl_addr[i]; 650 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 651 return -EFAULT; 652 } 653 return 0; 654 done: 655 read_unlock_bh(&idev->lock); 656 in6_dev_put(idev); 657 dev_put(dev); 658 return err; 659 } 660 661 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 662 const struct in6_addr *src_addr) 663 { 664 struct ipv6_pinfo *np = inet6_sk(sk); 665 struct ipv6_mc_socklist *mc; 666 struct ip6_sf_socklist *psl; 667 int rv = 1; 668 669 read_lock(&ipv6_sk_mc_lock); 670 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 671 if (ipv6_addr_equal(&mc->addr, mc_addr)) 672 break; 673 } 674 if (!mc) { 675 read_unlock(&ipv6_sk_mc_lock); 676 return 1; 677 } 678 read_lock(&mc->sflock); 679 psl = mc->sflist; 680 if (!psl) { 681 rv = mc->sfmode == MCAST_EXCLUDE; 682 } else { 683 int i; 684 685 for (i=0; i<psl->sl_count; i++) { 686 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 687 break; 688 } 689 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 690 rv = 0; 691 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 692 rv = 0; 693 } 694 read_unlock(&mc->sflock); 695 read_unlock(&ipv6_sk_mc_lock); 696 697 return rv; 698 } 699 700 static void ma_put(struct ifmcaddr6 *mc) 701 { 702 if (atomic_dec_and_test(&mc->mca_refcnt)) { 703 in6_dev_put(mc->idev); 704 kfree(mc); 705 } 706 } 707 708 static void igmp6_group_added(struct ifmcaddr6 *mc) 709 { 710 struct net_device *dev = mc->idev->dev; 711 char buf[MAX_ADDR_LEN]; 712 713 spin_lock_bh(&mc->mca_lock); 714 if (!(mc->mca_flags&MAF_LOADED)) { 715 mc->mca_flags |= MAF_LOADED; 716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 717 dev_mc_add(dev, buf, dev->addr_len, 0); 718 } 719 spin_unlock_bh(&mc->mca_lock); 720 721 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 722 return; 723 724 if (MLD_V1_SEEN(mc->idev)) { 725 igmp6_join_group(mc); 726 return; 727 } 728 /* else v2 */ 729 730 mc->mca_crcount = mc->idev->mc_qrv; 731 mld_ifc_event(mc->idev); 732 } 733 734 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 735 { 736 struct net_device *dev = mc->idev->dev; 737 char buf[MAX_ADDR_LEN]; 738 739 spin_lock_bh(&mc->mca_lock); 740 if (mc->mca_flags&MAF_LOADED) { 741 mc->mca_flags &= ~MAF_LOADED; 742 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 743 dev_mc_delete(dev, buf, dev->addr_len, 0); 744 } 745 746 if (mc->mca_flags & MAF_NOREPORT) 747 goto done; 748 spin_unlock_bh(&mc->mca_lock); 749 750 if (!mc->idev->dead) 751 igmp6_leave_group(mc); 752 753 spin_lock_bh(&mc->mca_lock); 754 if (del_timer(&mc->mca_timer)) 755 atomic_dec(&mc->mca_refcnt); 756 done: 757 ip6_mc_clear_src(mc); 758 spin_unlock_bh(&mc->mca_lock); 759 } 760 761 /* 762 * deleted ifmcaddr6 manipulation 763 */ 764 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 765 { 766 struct ifmcaddr6 *pmc; 767 768 /* this is an "ifmcaddr6" for convenience; only the fields below 769 * are actually used. In particular, the refcnt and users are not 770 * used for management of the delete list. Using the same structure 771 * for deleted items allows change reports to use common code with 772 * non-deleted or query-response MCA's. 773 */ 774 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 775 if (!pmc) 776 return; 777 778 spin_lock_bh(&im->mca_lock); 779 spin_lock_init(&pmc->mca_lock); 780 pmc->idev = im->idev; 781 in6_dev_hold(idev); 782 pmc->mca_addr = im->mca_addr; 783 pmc->mca_crcount = idev->mc_qrv; 784 pmc->mca_sfmode = im->mca_sfmode; 785 if (pmc->mca_sfmode == MCAST_INCLUDE) { 786 struct ip6_sf_list *psf; 787 788 pmc->mca_tomb = im->mca_tomb; 789 pmc->mca_sources = im->mca_sources; 790 im->mca_tomb = im->mca_sources = NULL; 791 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 792 psf->sf_crcount = pmc->mca_crcount; 793 } 794 spin_unlock_bh(&im->mca_lock); 795 796 write_lock_bh(&idev->mc_lock); 797 pmc->next = idev->mc_tomb; 798 idev->mc_tomb = pmc; 799 write_unlock_bh(&idev->mc_lock); 800 } 801 802 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 803 { 804 struct ifmcaddr6 *pmc, *pmc_prev; 805 struct ip6_sf_list *psf, *psf_next; 806 807 write_lock_bh(&idev->mc_lock); 808 pmc_prev = NULL; 809 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 810 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 811 break; 812 pmc_prev = pmc; 813 } 814 if (pmc) { 815 if (pmc_prev) 816 pmc_prev->next = pmc->next; 817 else 818 idev->mc_tomb = pmc->next; 819 } 820 write_unlock_bh(&idev->mc_lock); 821 if (pmc) { 822 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 823 psf_next = psf->sf_next; 824 kfree(psf); 825 } 826 in6_dev_put(pmc->idev); 827 kfree(pmc); 828 } 829 } 830 831 static void mld_clear_delrec(struct inet6_dev *idev) 832 { 833 struct ifmcaddr6 *pmc, *nextpmc; 834 835 write_lock_bh(&idev->mc_lock); 836 pmc = idev->mc_tomb; 837 idev->mc_tomb = NULL; 838 write_unlock_bh(&idev->mc_lock); 839 840 for (; pmc; pmc = nextpmc) { 841 nextpmc = pmc->next; 842 ip6_mc_clear_src(pmc); 843 in6_dev_put(pmc->idev); 844 kfree(pmc); 845 } 846 847 /* clear dead sources, too */ 848 read_lock_bh(&idev->lock); 849 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 850 struct ip6_sf_list *psf, *psf_next; 851 852 spin_lock_bh(&pmc->mca_lock); 853 psf = pmc->mca_tomb; 854 pmc->mca_tomb = NULL; 855 spin_unlock_bh(&pmc->mca_lock); 856 for (; psf; psf=psf_next) { 857 psf_next = psf->sf_next; 858 kfree(psf); 859 } 860 } 861 read_unlock_bh(&idev->lock); 862 } 863 864 865 /* 866 * device multicast group inc (add if not found) 867 */ 868 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 869 { 870 struct ifmcaddr6 *mc; 871 struct inet6_dev *idev; 872 873 idev = in6_dev_get(dev); 874 875 if (idev == NULL) 876 return -EINVAL; 877 878 write_lock_bh(&idev->lock); 879 if (idev->dead) { 880 write_unlock_bh(&idev->lock); 881 in6_dev_put(idev); 882 return -ENODEV; 883 } 884 885 for (mc = idev->mc_list; mc; mc = mc->next) { 886 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 887 mc->mca_users++; 888 write_unlock_bh(&idev->lock); 889 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 890 NULL, 0); 891 in6_dev_put(idev); 892 return 0; 893 } 894 } 895 896 /* 897 * not found: create a new one. 898 */ 899 900 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 901 902 if (mc == NULL) { 903 write_unlock_bh(&idev->lock); 904 in6_dev_put(idev); 905 return -ENOMEM; 906 } 907 908 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 909 910 ipv6_addr_copy(&mc->mca_addr, addr); 911 mc->idev = idev; 912 mc->mca_users = 1; 913 /* mca_stamp should be updated upon changes */ 914 mc->mca_cstamp = mc->mca_tstamp = jiffies; 915 atomic_set(&mc->mca_refcnt, 2); 916 spin_lock_init(&mc->mca_lock); 917 918 /* initial mode is (EX, empty) */ 919 mc->mca_sfmode = MCAST_EXCLUDE; 920 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 921 922 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 923 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 924 mc->mca_flags |= MAF_NOREPORT; 925 926 mc->next = idev->mc_list; 927 idev->mc_list = mc; 928 write_unlock_bh(&idev->lock); 929 930 mld_del_delrec(idev, &mc->mca_addr); 931 igmp6_group_added(mc); 932 ma_put(mc); 933 return 0; 934 } 935 936 /* 937 * device multicast group del 938 */ 939 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 940 { 941 struct ifmcaddr6 *ma, **map; 942 943 write_lock_bh(&idev->lock); 944 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 945 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 946 if (--ma->mca_users == 0) { 947 *map = ma->next; 948 write_unlock_bh(&idev->lock); 949 950 igmp6_group_dropped(ma); 951 952 ma_put(ma); 953 return 0; 954 } 955 write_unlock_bh(&idev->lock); 956 return 0; 957 } 958 } 959 write_unlock_bh(&idev->lock); 960 961 return -ENOENT; 962 } 963 964 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 965 { 966 struct inet6_dev *idev = in6_dev_get(dev); 967 int err; 968 969 if (!idev) 970 return -ENODEV; 971 972 err = __ipv6_dev_mc_dec(idev, addr); 973 974 in6_dev_put(idev); 975 976 return err; 977 } 978 979 /* 980 * identify MLD packets for MLD filter exceptions 981 */ 982 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 983 { 984 struct icmp6hdr *pic; 985 986 if (nexthdr != IPPROTO_ICMPV6) 987 return 0; 988 989 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 990 return 0; 991 992 pic = icmp6_hdr(skb); 993 994 switch (pic->icmp6_type) { 995 case ICMPV6_MGM_QUERY: 996 case ICMPV6_MGM_REPORT: 997 case ICMPV6_MGM_REDUCTION: 998 case ICMPV6_MLD2_REPORT: 999 return 1; 1000 default: 1001 break; 1002 } 1003 return 0; 1004 } 1005 1006 /* 1007 * check if the interface/address pair is valid 1008 */ 1009 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1010 const struct in6_addr *src_addr) 1011 { 1012 struct inet6_dev *idev; 1013 struct ifmcaddr6 *mc; 1014 int rv = 0; 1015 1016 idev = in6_dev_get(dev); 1017 if (idev) { 1018 read_lock_bh(&idev->lock); 1019 for (mc = idev->mc_list; mc; mc=mc->next) { 1020 if (ipv6_addr_equal(&mc->mca_addr, group)) 1021 break; 1022 } 1023 if (mc) { 1024 if (src_addr && !ipv6_addr_any(src_addr)) { 1025 struct ip6_sf_list *psf; 1026 1027 spin_lock_bh(&mc->mca_lock); 1028 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1029 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1030 break; 1031 } 1032 if (psf) 1033 rv = psf->sf_count[MCAST_INCLUDE] || 1034 psf->sf_count[MCAST_EXCLUDE] != 1035 mc->mca_sfcount[MCAST_EXCLUDE]; 1036 else 1037 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1038 spin_unlock_bh(&mc->mca_lock); 1039 } else 1040 rv = 1; /* don't filter unspecified source */ 1041 } 1042 read_unlock_bh(&idev->lock); 1043 in6_dev_put(idev); 1044 } 1045 return rv; 1046 } 1047 1048 static void mld_gq_start_timer(struct inet6_dev *idev) 1049 { 1050 int tv = net_random() % idev->mc_maxdelay; 1051 1052 idev->mc_gq_running = 1; 1053 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1054 in6_dev_hold(idev); 1055 } 1056 1057 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1058 { 1059 int tv = net_random() % delay; 1060 1061 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1062 in6_dev_hold(idev); 1063 } 1064 1065 /* 1066 * IGMP handling (alias multicast ICMPv6 messages) 1067 */ 1068 1069 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1070 { 1071 unsigned long delay = resptime; 1072 1073 /* Do not start timer for these addresses */ 1074 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1075 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1076 return; 1077 1078 if (del_timer(&ma->mca_timer)) { 1079 atomic_dec(&ma->mca_refcnt); 1080 delay = ma->mca_timer.expires - jiffies; 1081 } 1082 1083 if (delay >= resptime) { 1084 if (resptime) 1085 delay = net_random() % resptime; 1086 else 1087 delay = 1; 1088 } 1089 ma->mca_timer.expires = jiffies + delay; 1090 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1091 atomic_inc(&ma->mca_refcnt); 1092 ma->mca_flags |= MAF_TIMER_RUNNING; 1093 } 1094 1095 /* mark EXCLUDE-mode sources */ 1096 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1097 struct in6_addr *srcs) 1098 { 1099 struct ip6_sf_list *psf; 1100 int i, scount; 1101 1102 scount = 0; 1103 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1104 if (scount == nsrcs) 1105 break; 1106 for (i=0; i<nsrcs; i++) { 1107 /* skip inactive filters */ 1108 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1109 pmc->mca_sfcount[MCAST_EXCLUDE] != 1110 psf->sf_count[MCAST_EXCLUDE]) 1111 continue; 1112 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1113 scount++; 1114 break; 1115 } 1116 } 1117 } 1118 pmc->mca_flags &= ~MAF_GSQUERY; 1119 if (scount == nsrcs) /* all sources excluded */ 1120 return 0; 1121 return 1; 1122 } 1123 1124 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1125 struct in6_addr *srcs) 1126 { 1127 struct ip6_sf_list *psf; 1128 int i, scount; 1129 1130 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1131 return mld_xmarksources(pmc, nsrcs, srcs); 1132 1133 /* mark INCLUDE-mode sources */ 1134 1135 scount = 0; 1136 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1137 if (scount == nsrcs) 1138 break; 1139 for (i=0; i<nsrcs; i++) { 1140 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1141 psf->sf_gsresp = 1; 1142 scount++; 1143 break; 1144 } 1145 } 1146 } 1147 if (!scount) { 1148 pmc->mca_flags &= ~MAF_GSQUERY; 1149 return 0; 1150 } 1151 pmc->mca_flags |= MAF_GSQUERY; 1152 return 1; 1153 } 1154 1155 int igmp6_event_query(struct sk_buff *skb) 1156 { 1157 struct mld2_query *mlh2 = NULL; 1158 struct ifmcaddr6 *ma; 1159 struct in6_addr *group; 1160 unsigned long max_delay; 1161 struct inet6_dev *idev; 1162 struct icmp6hdr *hdr; 1163 int group_type; 1164 int mark = 0; 1165 int len; 1166 1167 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1168 return -EINVAL; 1169 1170 /* compute payload length excluding extension headers */ 1171 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1172 len -= skb_network_header_len(skb); 1173 1174 /* Drop queries with not link local source */ 1175 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1176 return -EINVAL; 1177 1178 idev = in6_dev_get(skb->dev); 1179 1180 if (idev == NULL) 1181 return 0; 1182 1183 hdr = icmp6_hdr(skb); 1184 group = (struct in6_addr *) (hdr + 1); 1185 group_type = ipv6_addr_type(group); 1186 1187 if (group_type != IPV6_ADDR_ANY && 1188 !(group_type&IPV6_ADDR_MULTICAST)) { 1189 in6_dev_put(idev); 1190 return -EINVAL; 1191 } 1192 1193 if (len == 24) { 1194 int switchback; 1195 /* MLDv1 router present */ 1196 1197 /* Translate milliseconds to jiffies */ 1198 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1199 1200 switchback = (idev->mc_qrv + 1) * max_delay; 1201 idev->mc_v1_seen = jiffies + switchback; 1202 1203 /* cancel the interface change timer */ 1204 idev->mc_ifc_count = 0; 1205 if (del_timer(&idev->mc_ifc_timer)) 1206 __in6_dev_put(idev); 1207 /* clear deleted report items */ 1208 mld_clear_delrec(idev); 1209 } else if (len >= 28) { 1210 int srcs_offset = sizeof(struct mld2_query) - 1211 sizeof(struct icmp6hdr); 1212 if (!pskb_may_pull(skb, srcs_offset)) { 1213 in6_dev_put(idev); 1214 return -EINVAL; 1215 } 1216 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1217 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1218 if (!max_delay) 1219 max_delay = 1; 1220 idev->mc_maxdelay = max_delay; 1221 if (mlh2->qrv) 1222 idev->mc_qrv = mlh2->qrv; 1223 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1224 if (mlh2->nsrcs) { 1225 in6_dev_put(idev); 1226 return -EINVAL; /* no sources allowed */ 1227 } 1228 mld_gq_start_timer(idev); 1229 in6_dev_put(idev); 1230 return 0; 1231 } 1232 /* mark sources to include, if group & source-specific */ 1233 if (mlh2->nsrcs != 0) { 1234 if (!pskb_may_pull(skb, srcs_offset + 1235 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1236 in6_dev_put(idev); 1237 return -EINVAL; 1238 } 1239 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1240 mark = 1; 1241 } 1242 } else { 1243 in6_dev_put(idev); 1244 return -EINVAL; 1245 } 1246 1247 read_lock_bh(&idev->lock); 1248 if (group_type == IPV6_ADDR_ANY) { 1249 for (ma = idev->mc_list; ma; ma=ma->next) { 1250 spin_lock_bh(&ma->mca_lock); 1251 igmp6_group_queried(ma, max_delay); 1252 spin_unlock_bh(&ma->mca_lock); 1253 } 1254 } else { 1255 for (ma = idev->mc_list; ma; ma=ma->next) { 1256 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1257 continue; 1258 spin_lock_bh(&ma->mca_lock); 1259 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1260 /* gsquery <- gsquery && mark */ 1261 if (!mark) 1262 ma->mca_flags &= ~MAF_GSQUERY; 1263 } else { 1264 /* gsquery <- mark */ 1265 if (mark) 1266 ma->mca_flags |= MAF_GSQUERY; 1267 else 1268 ma->mca_flags &= ~MAF_GSQUERY; 1269 } 1270 if (!(ma->mca_flags & MAF_GSQUERY) || 1271 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1272 igmp6_group_queried(ma, max_delay); 1273 spin_unlock_bh(&ma->mca_lock); 1274 break; 1275 } 1276 } 1277 read_unlock_bh(&idev->lock); 1278 in6_dev_put(idev); 1279 1280 return 0; 1281 } 1282 1283 1284 int igmp6_event_report(struct sk_buff *skb) 1285 { 1286 struct ifmcaddr6 *ma; 1287 struct in6_addr *addrp; 1288 struct inet6_dev *idev; 1289 struct icmp6hdr *hdr; 1290 int addr_type; 1291 1292 /* Our own report looped back. Ignore it. */ 1293 if (skb->pkt_type == PACKET_LOOPBACK) 1294 return 0; 1295 1296 /* send our report if the MC router may not have heard this report */ 1297 if (skb->pkt_type != PACKET_MULTICAST && 1298 skb->pkt_type != PACKET_BROADCAST) 1299 return 0; 1300 1301 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1302 return -EINVAL; 1303 1304 hdr = icmp6_hdr(skb); 1305 1306 /* Drop reports with not link local source */ 1307 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1308 if (addr_type != IPV6_ADDR_ANY && 1309 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1310 return -EINVAL; 1311 1312 addrp = (struct in6_addr *) (hdr + 1); 1313 1314 idev = in6_dev_get(skb->dev); 1315 if (idev == NULL) 1316 return -ENODEV; 1317 1318 /* 1319 * Cancel the timer for this group 1320 */ 1321 1322 read_lock_bh(&idev->lock); 1323 for (ma = idev->mc_list; ma; ma=ma->next) { 1324 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1325 spin_lock(&ma->mca_lock); 1326 if (del_timer(&ma->mca_timer)) 1327 atomic_dec(&ma->mca_refcnt); 1328 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1329 spin_unlock(&ma->mca_lock); 1330 break; 1331 } 1332 } 1333 read_unlock_bh(&idev->lock); 1334 in6_dev_put(idev); 1335 return 0; 1336 } 1337 1338 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1339 int gdeleted, int sdeleted) 1340 { 1341 switch (type) { 1342 case MLD2_MODE_IS_INCLUDE: 1343 case MLD2_MODE_IS_EXCLUDE: 1344 if (gdeleted || sdeleted) 1345 return 0; 1346 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1347 if (pmc->mca_sfmode == MCAST_INCLUDE) 1348 return 1; 1349 /* don't include if this source is excluded 1350 * in all filters 1351 */ 1352 if (psf->sf_count[MCAST_INCLUDE]) 1353 return type == MLD2_MODE_IS_INCLUDE; 1354 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1355 psf->sf_count[MCAST_EXCLUDE]; 1356 } 1357 return 0; 1358 case MLD2_CHANGE_TO_INCLUDE: 1359 if (gdeleted || sdeleted) 1360 return 0; 1361 return psf->sf_count[MCAST_INCLUDE] != 0; 1362 case MLD2_CHANGE_TO_EXCLUDE: 1363 if (gdeleted || sdeleted) 1364 return 0; 1365 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1366 psf->sf_count[MCAST_INCLUDE]) 1367 return 0; 1368 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1369 psf->sf_count[MCAST_EXCLUDE]; 1370 case MLD2_ALLOW_NEW_SOURCES: 1371 if (gdeleted || !psf->sf_crcount) 1372 return 0; 1373 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1374 case MLD2_BLOCK_OLD_SOURCES: 1375 if (pmc->mca_sfmode == MCAST_INCLUDE) 1376 return gdeleted || (psf->sf_crcount && sdeleted); 1377 return psf->sf_crcount && !gdeleted && !sdeleted; 1378 } 1379 return 0; 1380 } 1381 1382 static int 1383 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1384 { 1385 struct ip6_sf_list *psf; 1386 int scount = 0; 1387 1388 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1389 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1390 continue; 1391 scount++; 1392 } 1393 return scount; 1394 } 1395 1396 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1397 { 1398 struct net *net = dev_net(dev); 1399 struct sock *sk = net->ipv6.igmp_sk; 1400 struct sk_buff *skb; 1401 struct mld2_report *pmr; 1402 struct in6_addr addr_buf; 1403 const struct in6_addr *saddr; 1404 int err; 1405 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1406 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1407 IPV6_TLV_PADN, 0 }; 1408 1409 /* we assume size > sizeof(ra) here */ 1410 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err); 1411 1412 if (!skb) 1413 return NULL; 1414 1415 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1416 1417 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1418 /* <draft-ietf-magma-mld-source-05.txt>: 1419 * use unspecified address as the source address 1420 * when a valid link-local address is not available. 1421 */ 1422 saddr = &in6addr_any; 1423 } else 1424 saddr = &addr_buf; 1425 1426 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1427 1428 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1429 1430 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1431 skb_put(skb, sizeof(*pmr)); 1432 pmr = (struct mld2_report *)skb_transport_header(skb); 1433 pmr->type = ICMPV6_MLD2_REPORT; 1434 pmr->resv1 = 0; 1435 pmr->csum = 0; 1436 pmr->resv2 = 0; 1437 pmr->ngrec = 0; 1438 return skb; 1439 } 1440 1441 static void mld_sendpack(struct sk_buff *skb) 1442 { 1443 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1444 struct mld2_report *pmr = 1445 (struct mld2_report *)skb_transport_header(skb); 1446 int payload_len, mldlen; 1447 struct inet6_dev *idev = in6_dev_get(skb->dev); 1448 struct net *net = dev_net(skb->dev); 1449 int err; 1450 struct flowi fl; 1451 struct dst_entry *dst; 1452 1453 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1454 1455 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1456 mldlen = skb->tail - skb->transport_header; 1457 pip6->payload_len = htons(payload_len); 1458 1459 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1460 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), 1461 mldlen, 0)); 1462 1463 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1464 1465 if (!dst) { 1466 err = -ENOMEM; 1467 goto err_out; 1468 } 1469 1470 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT, 1471 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1472 skb->dev->ifindex); 1473 1474 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1475 skb_dst_set(skb, dst); 1476 if (err) 1477 goto err_out; 1478 1479 payload_len = skb->len; 1480 1481 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1482 dst_output); 1483 out: 1484 if (!err) { 1485 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1486 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1487 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1488 } else 1489 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1490 1491 if (likely(idev != NULL)) 1492 in6_dev_put(idev); 1493 return; 1494 1495 err_out: 1496 kfree_skb(skb); 1497 goto out; 1498 } 1499 1500 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1501 { 1502 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1503 } 1504 1505 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1506 int type, struct mld2_grec **ppgr) 1507 { 1508 struct net_device *dev = pmc->idev->dev; 1509 struct mld2_report *pmr; 1510 struct mld2_grec *pgr; 1511 1512 if (!skb) 1513 skb = mld_newpack(dev, dev->mtu); 1514 if (!skb) 1515 return NULL; 1516 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1517 pgr->grec_type = type; 1518 pgr->grec_auxwords = 0; 1519 pgr->grec_nsrcs = 0; 1520 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1521 pmr = (struct mld2_report *)skb_transport_header(skb); 1522 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1523 *ppgr = pgr; 1524 return skb; 1525 } 1526 1527 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1528 skb_tailroom(skb)) : 0) 1529 1530 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1531 int type, int gdeleted, int sdeleted) 1532 { 1533 struct net_device *dev = pmc->idev->dev; 1534 struct mld2_report *pmr; 1535 struct mld2_grec *pgr = NULL; 1536 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1537 int scount, stotal, first, isquery, truncate; 1538 1539 if (pmc->mca_flags & MAF_NOREPORT) 1540 return skb; 1541 1542 isquery = type == MLD2_MODE_IS_INCLUDE || 1543 type == MLD2_MODE_IS_EXCLUDE; 1544 truncate = type == MLD2_MODE_IS_EXCLUDE || 1545 type == MLD2_CHANGE_TO_EXCLUDE; 1546 1547 stotal = scount = 0; 1548 1549 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1550 1551 if (!*psf_list) 1552 goto empty_source; 1553 1554 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1555 1556 /* EX and TO_EX get a fresh packet, if needed */ 1557 if (truncate) { 1558 if (pmr && pmr->ngrec && 1559 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1560 if (skb) 1561 mld_sendpack(skb); 1562 skb = mld_newpack(dev, dev->mtu); 1563 } 1564 } 1565 first = 1; 1566 psf_prev = NULL; 1567 for (psf=*psf_list; psf; psf=psf_next) { 1568 struct in6_addr *psrc; 1569 1570 psf_next = psf->sf_next; 1571 1572 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1573 psf_prev = psf; 1574 continue; 1575 } 1576 1577 /* clear marks on query responses */ 1578 if (isquery) 1579 psf->sf_gsresp = 0; 1580 1581 if (AVAILABLE(skb) < sizeof(*psrc) + 1582 first*sizeof(struct mld2_grec)) { 1583 if (truncate && !first) 1584 break; /* truncate these */ 1585 if (pgr) 1586 pgr->grec_nsrcs = htons(scount); 1587 if (skb) 1588 mld_sendpack(skb); 1589 skb = mld_newpack(dev, dev->mtu); 1590 first = 1; 1591 scount = 0; 1592 } 1593 if (first) { 1594 skb = add_grhead(skb, pmc, type, &pgr); 1595 first = 0; 1596 } 1597 if (!skb) 1598 return NULL; 1599 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1600 *psrc = psf->sf_addr; 1601 scount++; stotal++; 1602 if ((type == MLD2_ALLOW_NEW_SOURCES || 1603 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1604 psf->sf_crcount--; 1605 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1606 if (psf_prev) 1607 psf_prev->sf_next = psf->sf_next; 1608 else 1609 *psf_list = psf->sf_next; 1610 kfree(psf); 1611 continue; 1612 } 1613 } 1614 psf_prev = psf; 1615 } 1616 1617 empty_source: 1618 if (!stotal) { 1619 if (type == MLD2_ALLOW_NEW_SOURCES || 1620 type == MLD2_BLOCK_OLD_SOURCES) 1621 return skb; 1622 if (pmc->mca_crcount || isquery) { 1623 /* make sure we have room for group header */ 1624 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1625 mld_sendpack(skb); 1626 skb = NULL; /* add_grhead will get a new one */ 1627 } 1628 skb = add_grhead(skb, pmc, type, &pgr); 1629 } 1630 } 1631 if (pgr) 1632 pgr->grec_nsrcs = htons(scount); 1633 1634 if (isquery) 1635 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1636 return skb; 1637 } 1638 1639 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1640 { 1641 struct sk_buff *skb = NULL; 1642 int type; 1643 1644 if (!pmc) { 1645 read_lock_bh(&idev->lock); 1646 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1647 if (pmc->mca_flags & MAF_NOREPORT) 1648 continue; 1649 spin_lock_bh(&pmc->mca_lock); 1650 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1651 type = MLD2_MODE_IS_EXCLUDE; 1652 else 1653 type = MLD2_MODE_IS_INCLUDE; 1654 skb = add_grec(skb, pmc, type, 0, 0); 1655 spin_unlock_bh(&pmc->mca_lock); 1656 } 1657 read_unlock_bh(&idev->lock); 1658 } else { 1659 spin_lock_bh(&pmc->mca_lock); 1660 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1661 type = MLD2_MODE_IS_EXCLUDE; 1662 else 1663 type = MLD2_MODE_IS_INCLUDE; 1664 skb = add_grec(skb, pmc, type, 0, 0); 1665 spin_unlock_bh(&pmc->mca_lock); 1666 } 1667 if (skb) 1668 mld_sendpack(skb); 1669 } 1670 1671 /* 1672 * remove zero-count source records from a source filter list 1673 */ 1674 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1675 { 1676 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1677 1678 psf_prev = NULL; 1679 for (psf=*ppsf; psf; psf = psf_next) { 1680 psf_next = psf->sf_next; 1681 if (psf->sf_crcount == 0) { 1682 if (psf_prev) 1683 psf_prev->sf_next = psf->sf_next; 1684 else 1685 *ppsf = psf->sf_next; 1686 kfree(psf); 1687 } else 1688 psf_prev = psf; 1689 } 1690 } 1691 1692 static void mld_send_cr(struct inet6_dev *idev) 1693 { 1694 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1695 struct sk_buff *skb = NULL; 1696 int type, dtype; 1697 1698 read_lock_bh(&idev->lock); 1699 write_lock_bh(&idev->mc_lock); 1700 1701 /* deleted MCA's */ 1702 pmc_prev = NULL; 1703 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1704 pmc_next = pmc->next; 1705 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1706 type = MLD2_BLOCK_OLD_SOURCES; 1707 dtype = MLD2_BLOCK_OLD_SOURCES; 1708 skb = add_grec(skb, pmc, type, 1, 0); 1709 skb = add_grec(skb, pmc, dtype, 1, 1); 1710 } 1711 if (pmc->mca_crcount) { 1712 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1713 type = MLD2_CHANGE_TO_INCLUDE; 1714 skb = add_grec(skb, pmc, type, 1, 0); 1715 } 1716 pmc->mca_crcount--; 1717 if (pmc->mca_crcount == 0) { 1718 mld_clear_zeros(&pmc->mca_tomb); 1719 mld_clear_zeros(&pmc->mca_sources); 1720 } 1721 } 1722 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1723 !pmc->mca_sources) { 1724 if (pmc_prev) 1725 pmc_prev->next = pmc_next; 1726 else 1727 idev->mc_tomb = pmc_next; 1728 in6_dev_put(pmc->idev); 1729 kfree(pmc); 1730 } else 1731 pmc_prev = pmc; 1732 } 1733 write_unlock_bh(&idev->mc_lock); 1734 1735 /* change recs */ 1736 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1737 spin_lock_bh(&pmc->mca_lock); 1738 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1739 type = MLD2_BLOCK_OLD_SOURCES; 1740 dtype = MLD2_ALLOW_NEW_SOURCES; 1741 } else { 1742 type = MLD2_ALLOW_NEW_SOURCES; 1743 dtype = MLD2_BLOCK_OLD_SOURCES; 1744 } 1745 skb = add_grec(skb, pmc, type, 0, 0); 1746 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1747 1748 /* filter mode changes */ 1749 if (pmc->mca_crcount) { 1750 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1751 type = MLD2_CHANGE_TO_EXCLUDE; 1752 else 1753 type = MLD2_CHANGE_TO_INCLUDE; 1754 skb = add_grec(skb, pmc, type, 0, 0); 1755 pmc->mca_crcount--; 1756 } 1757 spin_unlock_bh(&pmc->mca_lock); 1758 } 1759 read_unlock_bh(&idev->lock); 1760 if (!skb) 1761 return; 1762 (void) mld_sendpack(skb); 1763 } 1764 1765 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1766 { 1767 struct net *net = dev_net(dev); 1768 struct sock *sk = net->ipv6.igmp_sk; 1769 struct inet6_dev *idev; 1770 struct sk_buff *skb; 1771 struct icmp6hdr *hdr; 1772 const struct in6_addr *snd_addr, *saddr; 1773 struct in6_addr *addrp; 1774 struct in6_addr addr_buf; 1775 int err, len, payload_len, full_len; 1776 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1777 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1778 IPV6_TLV_PADN, 0 }; 1779 struct flowi fl; 1780 struct dst_entry *dst; 1781 1782 if (type == ICMPV6_MGM_REDUCTION) 1783 snd_addr = &in6addr_linklocal_allrouters; 1784 else 1785 snd_addr = addr; 1786 1787 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1788 payload_len = len + sizeof(ra); 1789 full_len = sizeof(struct ipv6hdr) + payload_len; 1790 1791 rcu_read_lock(); 1792 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1793 IPSTATS_MIB_OUT, full_len); 1794 rcu_read_unlock(); 1795 1796 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err); 1797 1798 if (skb == NULL) { 1799 rcu_read_lock(); 1800 IP6_INC_STATS(net, __in6_dev_get(dev), 1801 IPSTATS_MIB_OUTDISCARDS); 1802 rcu_read_unlock(); 1803 return; 1804 } 1805 1806 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1807 1808 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1809 /* <draft-ietf-magma-mld-source-05.txt>: 1810 * use unspecified address as the source address 1811 * when a valid link-local address is not available. 1812 */ 1813 saddr = &in6addr_any; 1814 } else 1815 saddr = &addr_buf; 1816 1817 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1818 1819 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1820 1821 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1822 memset(hdr, 0, sizeof(struct icmp6hdr)); 1823 hdr->icmp6_type = type; 1824 1825 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1826 ipv6_addr_copy(addrp, addr); 1827 1828 hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1829 IPPROTO_ICMPV6, 1830 csum_partial(hdr, len, 0)); 1831 1832 idev = in6_dev_get(skb->dev); 1833 1834 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1835 if (!dst) { 1836 err = -ENOMEM; 1837 goto err_out; 1838 } 1839 1840 icmpv6_flow_init(sk, &fl, type, 1841 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1842 skb->dev->ifindex); 1843 1844 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1845 if (err) 1846 goto err_out; 1847 1848 skb_dst_set(skb, dst); 1849 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1850 dst_output); 1851 out: 1852 if (!err) { 1853 ICMP6MSGOUT_INC_STATS(net, idev, type); 1854 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1855 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1856 } else 1857 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1858 1859 if (likely(idev != NULL)) 1860 in6_dev_put(idev); 1861 return; 1862 1863 err_out: 1864 kfree_skb(skb); 1865 goto out; 1866 } 1867 1868 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1869 struct in6_addr *psfsrc) 1870 { 1871 struct ip6_sf_list *psf, *psf_prev; 1872 int rv = 0; 1873 1874 psf_prev = NULL; 1875 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1876 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1877 break; 1878 psf_prev = psf; 1879 } 1880 if (!psf || psf->sf_count[sfmode] == 0) { 1881 /* source filter not found, or count wrong => bug */ 1882 return -ESRCH; 1883 } 1884 psf->sf_count[sfmode]--; 1885 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1886 struct inet6_dev *idev = pmc->idev; 1887 1888 /* no more filters for this source */ 1889 if (psf_prev) 1890 psf_prev->sf_next = psf->sf_next; 1891 else 1892 pmc->mca_sources = psf->sf_next; 1893 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1894 !MLD_V1_SEEN(idev)) { 1895 psf->sf_crcount = idev->mc_qrv; 1896 psf->sf_next = pmc->mca_tomb; 1897 pmc->mca_tomb = psf; 1898 rv = 1; 1899 } else 1900 kfree(psf); 1901 } 1902 return rv; 1903 } 1904 1905 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1906 int sfmode, int sfcount, struct in6_addr *psfsrc, 1907 int delta) 1908 { 1909 struct ifmcaddr6 *pmc; 1910 int changerec = 0; 1911 int i, err; 1912 1913 if (!idev) 1914 return -ENODEV; 1915 read_lock_bh(&idev->lock); 1916 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1917 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1918 break; 1919 } 1920 if (!pmc) { 1921 /* MCA not found?? bug */ 1922 read_unlock_bh(&idev->lock); 1923 return -ESRCH; 1924 } 1925 spin_lock_bh(&pmc->mca_lock); 1926 sf_markstate(pmc); 1927 if (!delta) { 1928 if (!pmc->mca_sfcount[sfmode]) { 1929 spin_unlock_bh(&pmc->mca_lock); 1930 read_unlock_bh(&idev->lock); 1931 return -EINVAL; 1932 } 1933 pmc->mca_sfcount[sfmode]--; 1934 } 1935 err = 0; 1936 for (i=0; i<sfcount; i++) { 1937 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1938 1939 changerec |= rv > 0; 1940 if (!err && rv < 0) 1941 err = rv; 1942 } 1943 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1944 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1945 pmc->mca_sfcount[MCAST_INCLUDE]) { 1946 struct ip6_sf_list *psf; 1947 1948 /* filter mode change */ 1949 pmc->mca_sfmode = MCAST_INCLUDE; 1950 pmc->mca_crcount = idev->mc_qrv; 1951 idev->mc_ifc_count = pmc->mca_crcount; 1952 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1953 psf->sf_crcount = 0; 1954 mld_ifc_event(pmc->idev); 1955 } else if (sf_setstate(pmc) || changerec) 1956 mld_ifc_event(pmc->idev); 1957 spin_unlock_bh(&pmc->mca_lock); 1958 read_unlock_bh(&idev->lock); 1959 return err; 1960 } 1961 1962 /* 1963 * Add multicast single-source filter to the interface list 1964 */ 1965 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1966 struct in6_addr *psfsrc, int delta) 1967 { 1968 struct ip6_sf_list *psf, *psf_prev; 1969 1970 psf_prev = NULL; 1971 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1972 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1973 break; 1974 psf_prev = psf; 1975 } 1976 if (!psf) { 1977 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1978 if (!psf) 1979 return -ENOBUFS; 1980 1981 psf->sf_addr = *psfsrc; 1982 if (psf_prev) { 1983 psf_prev->sf_next = psf; 1984 } else 1985 pmc->mca_sources = psf; 1986 } 1987 psf->sf_count[sfmode]++; 1988 return 0; 1989 } 1990 1991 static void sf_markstate(struct ifmcaddr6 *pmc) 1992 { 1993 struct ip6_sf_list *psf; 1994 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1995 1996 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1997 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1998 psf->sf_oldin = mca_xcount == 1999 psf->sf_count[MCAST_EXCLUDE] && 2000 !psf->sf_count[MCAST_INCLUDE]; 2001 } else 2002 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2003 } 2004 2005 static int sf_setstate(struct ifmcaddr6 *pmc) 2006 { 2007 struct ip6_sf_list *psf, *dpsf; 2008 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2009 int qrv = pmc->idev->mc_qrv; 2010 int new_in, rv; 2011 2012 rv = 0; 2013 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2014 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2015 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2016 !psf->sf_count[MCAST_INCLUDE]; 2017 } else 2018 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2019 if (new_in) { 2020 if (!psf->sf_oldin) { 2021 struct ip6_sf_list *prev = NULL; 2022 2023 for (dpsf=pmc->mca_tomb; dpsf; 2024 dpsf=dpsf->sf_next) { 2025 if (ipv6_addr_equal(&dpsf->sf_addr, 2026 &psf->sf_addr)) 2027 break; 2028 prev = dpsf; 2029 } 2030 if (dpsf) { 2031 if (prev) 2032 prev->sf_next = dpsf->sf_next; 2033 else 2034 pmc->mca_tomb = dpsf->sf_next; 2035 kfree(dpsf); 2036 } 2037 psf->sf_crcount = qrv; 2038 rv++; 2039 } 2040 } else if (psf->sf_oldin) { 2041 psf->sf_crcount = 0; 2042 /* 2043 * add or update "delete" records if an active filter 2044 * is now inactive 2045 */ 2046 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2047 if (ipv6_addr_equal(&dpsf->sf_addr, 2048 &psf->sf_addr)) 2049 break; 2050 if (!dpsf) { 2051 dpsf = (struct ip6_sf_list *) 2052 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2053 if (!dpsf) 2054 continue; 2055 *dpsf = *psf; 2056 /* pmc->mca_lock held by callers */ 2057 dpsf->sf_next = pmc->mca_tomb; 2058 pmc->mca_tomb = dpsf; 2059 } 2060 dpsf->sf_crcount = qrv; 2061 rv++; 2062 } 2063 } 2064 return rv; 2065 } 2066 2067 /* 2068 * Add multicast source filter list to the interface list 2069 */ 2070 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2071 int sfmode, int sfcount, struct in6_addr *psfsrc, 2072 int delta) 2073 { 2074 struct ifmcaddr6 *pmc; 2075 int isexclude; 2076 int i, err; 2077 2078 if (!idev) 2079 return -ENODEV; 2080 read_lock_bh(&idev->lock); 2081 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2082 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2083 break; 2084 } 2085 if (!pmc) { 2086 /* MCA not found?? bug */ 2087 read_unlock_bh(&idev->lock); 2088 return -ESRCH; 2089 } 2090 spin_lock_bh(&pmc->mca_lock); 2091 2092 sf_markstate(pmc); 2093 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2094 if (!delta) 2095 pmc->mca_sfcount[sfmode]++; 2096 err = 0; 2097 for (i=0; i<sfcount; i++) { 2098 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2099 if (err) 2100 break; 2101 } 2102 if (err) { 2103 int j; 2104 2105 if (!delta) 2106 pmc->mca_sfcount[sfmode]--; 2107 for (j=0; j<i; j++) 2108 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2109 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2110 struct inet6_dev *idev = pmc->idev; 2111 struct ip6_sf_list *psf; 2112 2113 /* filter mode change */ 2114 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2115 pmc->mca_sfmode = MCAST_EXCLUDE; 2116 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2117 pmc->mca_sfmode = MCAST_INCLUDE; 2118 /* else no filters; keep old mode for reports */ 2119 2120 pmc->mca_crcount = idev->mc_qrv; 2121 idev->mc_ifc_count = pmc->mca_crcount; 2122 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2123 psf->sf_crcount = 0; 2124 mld_ifc_event(idev); 2125 } else if (sf_setstate(pmc)) 2126 mld_ifc_event(idev); 2127 spin_unlock_bh(&pmc->mca_lock); 2128 read_unlock_bh(&idev->lock); 2129 return err; 2130 } 2131 2132 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2133 { 2134 struct ip6_sf_list *psf, *nextpsf; 2135 2136 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2137 nextpsf = psf->sf_next; 2138 kfree(psf); 2139 } 2140 pmc->mca_tomb = NULL; 2141 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2142 nextpsf = psf->sf_next; 2143 kfree(psf); 2144 } 2145 pmc->mca_sources = NULL; 2146 pmc->mca_sfmode = MCAST_EXCLUDE; 2147 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2148 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2149 } 2150 2151 2152 static void igmp6_join_group(struct ifmcaddr6 *ma) 2153 { 2154 unsigned long delay; 2155 2156 if (ma->mca_flags & MAF_NOREPORT) 2157 return; 2158 2159 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2160 2161 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2162 2163 spin_lock_bh(&ma->mca_lock); 2164 if (del_timer(&ma->mca_timer)) { 2165 atomic_dec(&ma->mca_refcnt); 2166 delay = ma->mca_timer.expires - jiffies; 2167 } 2168 2169 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2170 atomic_inc(&ma->mca_refcnt); 2171 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2172 spin_unlock_bh(&ma->mca_lock); 2173 } 2174 2175 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2176 struct inet6_dev *idev) 2177 { 2178 int err; 2179 2180 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2181 * so no other readers or writers of iml or its sflist 2182 */ 2183 if (!iml->sflist) { 2184 /* any-source empty exclude case */ 2185 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2186 } 2187 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2188 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2189 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2190 iml->sflist = NULL; 2191 return err; 2192 } 2193 2194 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2195 { 2196 if (MLD_V1_SEEN(ma->idev)) { 2197 if (ma->mca_flags & MAF_LAST_REPORTER) 2198 igmp6_send(&ma->mca_addr, ma->idev->dev, 2199 ICMPV6_MGM_REDUCTION); 2200 } else { 2201 mld_add_delrec(ma->idev, ma); 2202 mld_ifc_event(ma->idev); 2203 } 2204 } 2205 2206 static void mld_gq_timer_expire(unsigned long data) 2207 { 2208 struct inet6_dev *idev = (struct inet6_dev *)data; 2209 2210 idev->mc_gq_running = 0; 2211 mld_send_report(idev, NULL); 2212 __in6_dev_put(idev); 2213 } 2214 2215 static void mld_ifc_timer_expire(unsigned long data) 2216 { 2217 struct inet6_dev *idev = (struct inet6_dev *)data; 2218 2219 mld_send_cr(idev); 2220 if (idev->mc_ifc_count) { 2221 idev->mc_ifc_count--; 2222 if (idev->mc_ifc_count) 2223 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2224 } 2225 __in6_dev_put(idev); 2226 } 2227 2228 static void mld_ifc_event(struct inet6_dev *idev) 2229 { 2230 if (MLD_V1_SEEN(idev)) 2231 return; 2232 idev->mc_ifc_count = idev->mc_qrv; 2233 mld_ifc_start_timer(idev, 1); 2234 } 2235 2236 2237 static void igmp6_timer_handler(unsigned long data) 2238 { 2239 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2240 2241 if (MLD_V1_SEEN(ma->idev)) 2242 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2243 else 2244 mld_send_report(ma->idev, ma); 2245 2246 spin_lock(&ma->mca_lock); 2247 ma->mca_flags |= MAF_LAST_REPORTER; 2248 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2249 spin_unlock(&ma->mca_lock); 2250 ma_put(ma); 2251 } 2252 2253 /* Device going down */ 2254 2255 void ipv6_mc_down(struct inet6_dev *idev) 2256 { 2257 struct ifmcaddr6 *i; 2258 2259 /* Withdraw multicast list */ 2260 2261 read_lock_bh(&idev->lock); 2262 idev->mc_ifc_count = 0; 2263 if (del_timer(&idev->mc_ifc_timer)) 2264 __in6_dev_put(idev); 2265 idev->mc_gq_running = 0; 2266 if (del_timer(&idev->mc_gq_timer)) 2267 __in6_dev_put(idev); 2268 2269 for (i = idev->mc_list; i; i=i->next) 2270 igmp6_group_dropped(i); 2271 read_unlock_bh(&idev->lock); 2272 2273 mld_clear_delrec(idev); 2274 } 2275 2276 2277 /* Device going up */ 2278 2279 void ipv6_mc_up(struct inet6_dev *idev) 2280 { 2281 struct ifmcaddr6 *i; 2282 2283 /* Install multicast list, except for all-nodes (already installed) */ 2284 2285 read_lock_bh(&idev->lock); 2286 for (i = idev->mc_list; i; i=i->next) 2287 igmp6_group_added(i); 2288 read_unlock_bh(&idev->lock); 2289 } 2290 2291 /* IPv6 device initialization. */ 2292 2293 void ipv6_mc_init_dev(struct inet6_dev *idev) 2294 { 2295 write_lock_bh(&idev->lock); 2296 rwlock_init(&idev->mc_lock); 2297 idev->mc_gq_running = 0; 2298 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2299 (unsigned long)idev); 2300 idev->mc_tomb = NULL; 2301 idev->mc_ifc_count = 0; 2302 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2303 (unsigned long)idev); 2304 idev->mc_qrv = MLD_QRV_DEFAULT; 2305 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2306 idev->mc_v1_seen = 0; 2307 write_unlock_bh(&idev->lock); 2308 } 2309 2310 /* 2311 * Device is about to be destroyed: clean up. 2312 */ 2313 2314 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2315 { 2316 struct ifmcaddr6 *i; 2317 2318 /* Deactivate timers */ 2319 ipv6_mc_down(idev); 2320 2321 /* Delete all-nodes address. */ 2322 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2323 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2324 * fail. 2325 */ 2326 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2327 2328 if (idev->cnf.forwarding) 2329 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2330 2331 write_lock_bh(&idev->lock); 2332 while ((i = idev->mc_list) != NULL) { 2333 idev->mc_list = i->next; 2334 write_unlock_bh(&idev->lock); 2335 2336 igmp6_group_dropped(i); 2337 ma_put(i); 2338 2339 write_lock_bh(&idev->lock); 2340 } 2341 write_unlock_bh(&idev->lock); 2342 } 2343 2344 #ifdef CONFIG_PROC_FS 2345 struct igmp6_mc_iter_state { 2346 struct seq_net_private p; 2347 struct net_device *dev; 2348 struct inet6_dev *idev; 2349 }; 2350 2351 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2352 2353 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2354 { 2355 struct ifmcaddr6 *im = NULL; 2356 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2357 struct net *net = seq_file_net(seq); 2358 2359 state->idev = NULL; 2360 for_each_netdev(net, state->dev) { 2361 struct inet6_dev *idev; 2362 idev = in6_dev_get(state->dev); 2363 if (!idev) 2364 continue; 2365 read_lock_bh(&idev->lock); 2366 im = idev->mc_list; 2367 if (im) { 2368 state->idev = idev; 2369 break; 2370 } 2371 read_unlock_bh(&idev->lock); 2372 in6_dev_put(idev); 2373 } 2374 return im; 2375 } 2376 2377 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2378 { 2379 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2380 2381 im = im->next; 2382 while (!im) { 2383 if (likely(state->idev != NULL)) { 2384 read_unlock_bh(&state->idev->lock); 2385 in6_dev_put(state->idev); 2386 } 2387 state->dev = next_net_device(state->dev); 2388 if (!state->dev) { 2389 state->idev = NULL; 2390 break; 2391 } 2392 state->idev = in6_dev_get(state->dev); 2393 if (!state->idev) 2394 continue; 2395 read_lock_bh(&state->idev->lock); 2396 im = state->idev->mc_list; 2397 } 2398 return im; 2399 } 2400 2401 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2402 { 2403 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2404 if (im) 2405 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2406 --pos; 2407 return pos ? NULL : im; 2408 } 2409 2410 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2411 __acquires(dev_base_lock) 2412 { 2413 read_lock(&dev_base_lock); 2414 return igmp6_mc_get_idx(seq, *pos); 2415 } 2416 2417 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2418 { 2419 struct ifmcaddr6 *im; 2420 im = igmp6_mc_get_next(seq, v); 2421 ++*pos; 2422 return im; 2423 } 2424 2425 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2426 __releases(dev_base_lock) 2427 { 2428 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2429 if (likely(state->idev != NULL)) { 2430 read_unlock_bh(&state->idev->lock); 2431 in6_dev_put(state->idev); 2432 state->idev = NULL; 2433 } 2434 state->dev = NULL; 2435 read_unlock(&dev_base_lock); 2436 } 2437 2438 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2439 { 2440 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2441 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2442 2443 seq_printf(seq, 2444 "%-4d %-15s %pi6 %5d %08X %ld\n", 2445 state->dev->ifindex, state->dev->name, 2446 &im->mca_addr, 2447 im->mca_users, im->mca_flags, 2448 (im->mca_flags&MAF_TIMER_RUNNING) ? 2449 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2450 return 0; 2451 } 2452 2453 static const struct seq_operations igmp6_mc_seq_ops = { 2454 .start = igmp6_mc_seq_start, 2455 .next = igmp6_mc_seq_next, 2456 .stop = igmp6_mc_seq_stop, 2457 .show = igmp6_mc_seq_show, 2458 }; 2459 2460 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2461 { 2462 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2463 sizeof(struct igmp6_mc_iter_state)); 2464 } 2465 2466 static const struct file_operations igmp6_mc_seq_fops = { 2467 .owner = THIS_MODULE, 2468 .open = igmp6_mc_seq_open, 2469 .read = seq_read, 2470 .llseek = seq_lseek, 2471 .release = seq_release_net, 2472 }; 2473 2474 struct igmp6_mcf_iter_state { 2475 struct seq_net_private p; 2476 struct net_device *dev; 2477 struct inet6_dev *idev; 2478 struct ifmcaddr6 *im; 2479 }; 2480 2481 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2482 2483 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2484 { 2485 struct ip6_sf_list *psf = NULL; 2486 struct ifmcaddr6 *im = NULL; 2487 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2488 struct net *net = seq_file_net(seq); 2489 2490 state->idev = NULL; 2491 state->im = NULL; 2492 for_each_netdev(net, state->dev) { 2493 struct inet6_dev *idev; 2494 idev = in6_dev_get(state->dev); 2495 if (unlikely(idev == NULL)) 2496 continue; 2497 read_lock_bh(&idev->lock); 2498 im = idev->mc_list; 2499 if (likely(im != NULL)) { 2500 spin_lock_bh(&im->mca_lock); 2501 psf = im->mca_sources; 2502 if (likely(psf != NULL)) { 2503 state->im = im; 2504 state->idev = idev; 2505 break; 2506 } 2507 spin_unlock_bh(&im->mca_lock); 2508 } 2509 read_unlock_bh(&idev->lock); 2510 in6_dev_put(idev); 2511 } 2512 return psf; 2513 } 2514 2515 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2516 { 2517 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2518 2519 psf = psf->sf_next; 2520 while (!psf) { 2521 spin_unlock_bh(&state->im->mca_lock); 2522 state->im = state->im->next; 2523 while (!state->im) { 2524 if (likely(state->idev != NULL)) { 2525 read_unlock_bh(&state->idev->lock); 2526 in6_dev_put(state->idev); 2527 } 2528 state->dev = next_net_device(state->dev); 2529 if (!state->dev) { 2530 state->idev = NULL; 2531 goto out; 2532 } 2533 state->idev = in6_dev_get(state->dev); 2534 if (!state->idev) 2535 continue; 2536 read_lock_bh(&state->idev->lock); 2537 state->im = state->idev->mc_list; 2538 } 2539 if (!state->im) 2540 break; 2541 spin_lock_bh(&state->im->mca_lock); 2542 psf = state->im->mca_sources; 2543 } 2544 out: 2545 return psf; 2546 } 2547 2548 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2549 { 2550 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2551 if (psf) 2552 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2553 --pos; 2554 return pos ? NULL : psf; 2555 } 2556 2557 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2558 __acquires(dev_base_lock) 2559 { 2560 read_lock(&dev_base_lock); 2561 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2562 } 2563 2564 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2565 { 2566 struct ip6_sf_list *psf; 2567 if (v == SEQ_START_TOKEN) 2568 psf = igmp6_mcf_get_first(seq); 2569 else 2570 psf = igmp6_mcf_get_next(seq, v); 2571 ++*pos; 2572 return psf; 2573 } 2574 2575 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2576 __releases(dev_base_lock) 2577 { 2578 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2579 if (likely(state->im != NULL)) { 2580 spin_unlock_bh(&state->im->mca_lock); 2581 state->im = NULL; 2582 } 2583 if (likely(state->idev != NULL)) { 2584 read_unlock_bh(&state->idev->lock); 2585 in6_dev_put(state->idev); 2586 state->idev = NULL; 2587 } 2588 state->dev = NULL; 2589 read_unlock(&dev_base_lock); 2590 } 2591 2592 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2593 { 2594 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2595 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2596 2597 if (v == SEQ_START_TOKEN) { 2598 seq_printf(seq, 2599 "%3s %6s " 2600 "%32s %32s %6s %6s\n", "Idx", 2601 "Device", "Multicast Address", 2602 "Source Address", "INC", "EXC"); 2603 } else { 2604 seq_printf(seq, 2605 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2606 state->dev->ifindex, state->dev->name, 2607 &state->im->mca_addr, 2608 &psf->sf_addr, 2609 psf->sf_count[MCAST_INCLUDE], 2610 psf->sf_count[MCAST_EXCLUDE]); 2611 } 2612 return 0; 2613 } 2614 2615 static const struct seq_operations igmp6_mcf_seq_ops = { 2616 .start = igmp6_mcf_seq_start, 2617 .next = igmp6_mcf_seq_next, 2618 .stop = igmp6_mcf_seq_stop, 2619 .show = igmp6_mcf_seq_show, 2620 }; 2621 2622 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2623 { 2624 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2625 sizeof(struct igmp6_mcf_iter_state)); 2626 } 2627 2628 static const struct file_operations igmp6_mcf_seq_fops = { 2629 .owner = THIS_MODULE, 2630 .open = igmp6_mcf_seq_open, 2631 .read = seq_read, 2632 .llseek = seq_lseek, 2633 .release = seq_release_net, 2634 }; 2635 2636 static int igmp6_proc_init(struct net *net) 2637 { 2638 int err; 2639 2640 err = -ENOMEM; 2641 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2642 goto out; 2643 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2644 &igmp6_mcf_seq_fops)) 2645 goto out_proc_net_igmp6; 2646 2647 err = 0; 2648 out: 2649 return err; 2650 2651 out_proc_net_igmp6: 2652 proc_net_remove(net, "igmp6"); 2653 goto out; 2654 } 2655 2656 static void igmp6_proc_exit(struct net *net) 2657 { 2658 proc_net_remove(net, "mcfilter6"); 2659 proc_net_remove(net, "igmp6"); 2660 } 2661 #else 2662 static int igmp6_proc_init(struct net *net) 2663 { 2664 return 0; 2665 } 2666 static void igmp6_proc_exit(struct net *net) 2667 { 2668 ; 2669 } 2670 #endif 2671 2672 static int igmp6_net_init(struct net *net) 2673 { 2674 int err; 2675 2676 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2677 SOCK_RAW, IPPROTO_ICMPV6, net); 2678 if (err < 0) { 2679 printk(KERN_ERR 2680 "Failed to initialize the IGMP6 control socket (err %d).\n", 2681 err); 2682 goto out; 2683 } 2684 2685 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2686 2687 err = igmp6_proc_init(net); 2688 if (err) 2689 goto out_sock_create; 2690 out: 2691 return err; 2692 2693 out_sock_create: 2694 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2695 goto out; 2696 } 2697 2698 static void igmp6_net_exit(struct net *net) 2699 { 2700 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2701 igmp6_proc_exit(net); 2702 } 2703 2704 static struct pernet_operations igmp6_net_ops = { 2705 .init = igmp6_net_init, 2706 .exit = igmp6_net_exit, 2707 }; 2708 2709 int __init igmp6_init(void) 2710 { 2711 return register_pernet_subsys(&igmp6_net_ops); 2712 } 2713 2714 void igmp6_cleanup(void) 2715 { 2716 unregister_pernet_subsys(&igmp6_net_ops); 2717 } 2718