1 /* 2 * Multicast support for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 /* Changes: 17 * 18 * yoshfuji : fix format of router-alert option 19 * YOSHIFUJI Hideaki @USAGI: 20 * Fixed source address for MLD message based on 21 * <draft-ietf-magma-mld-source-05.txt>. 22 * YOSHIFUJI Hideaki @USAGI: 23 * - Ignore Queries for invalid addresses. 24 * - MLD for link-local addresses. 25 * David L Stevens <dlstevens@us.ibm.com>: 26 * - MLDv2 support 27 */ 28 29 #include <linux/module.h> 30 #include <linux/errno.h> 31 #include <linux/types.h> 32 #include <linux/string.h> 33 #include <linux/socket.h> 34 #include <linux/sockios.h> 35 #include <linux/jiffies.h> 36 #include <linux/times.h> 37 #include <linux/net.h> 38 #include <linux/in.h> 39 #include <linux/in6.h> 40 #include <linux/netdevice.h> 41 #include <linux/if_arp.h> 42 #include <linux/route.h> 43 #include <linux/init.h> 44 #include <linux/proc_fs.h> 45 #include <linux/seq_file.h> 46 #include <linux/slab.h> 47 48 #include <linux/netfilter.h> 49 #include <linux/netfilter_ipv6.h> 50 51 #include <net/net_namespace.h> 52 #include <net/sock.h> 53 #include <net/snmp.h> 54 55 #include <net/ipv6.h> 56 #include <net/protocol.h> 57 #include <net/if_inet6.h> 58 #include <net/ndisc.h> 59 #include <net/addrconf.h> 60 #include <net/ip6_route.h> 61 #include <net/inet_common.h> 62 63 #include <net/ip6_checksum.h> 64 65 /* Set to 3 to get tracing... */ 66 #define MCAST_DEBUG 2 67 68 #if MCAST_DEBUG >= 3 69 #define MDBG(x) printk x 70 #else 71 #define MDBG(x) 72 #endif 73 74 /* 75 * These header formats should be in a separate include file, but icmpv6.h 76 * doesn't have in6_addr defined in all cases, there is no __u128, and no 77 * other files reference these. 78 * 79 * +-DLS 4/14/03 80 */ 81 82 /* Multicast Listener Discovery version 2 headers */ 83 84 struct mld2_grec { 85 __u8 grec_type; 86 __u8 grec_auxwords; 87 __be16 grec_nsrcs; 88 struct in6_addr grec_mca; 89 struct in6_addr grec_src[0]; 90 }; 91 92 struct mld2_report { 93 __u8 type; 94 __u8 resv1; 95 __sum16 csum; 96 __be16 resv2; 97 __be16 ngrec; 98 struct mld2_grec grec[0]; 99 }; 100 101 struct mld2_query { 102 __u8 type; 103 __u8 code; 104 __sum16 csum; 105 __be16 mrc; 106 __be16 resv1; 107 struct in6_addr mca; 108 #if defined(__LITTLE_ENDIAN_BITFIELD) 109 __u8 qrv:3, 110 suppress:1, 111 resv2:4; 112 #elif defined(__BIG_ENDIAN_BITFIELD) 113 __u8 resv2:4, 114 suppress:1, 115 qrv:3; 116 #else 117 #error "Please fix <asm/byteorder.h>" 118 #endif 119 __u8 qqic; 120 __be16 nsrcs; 121 struct in6_addr srcs[0]; 122 }; 123 124 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 125 126 /* Big mc list lock for all the sockets */ 127 static DEFINE_RWLOCK(ipv6_sk_mc_lock); 128 129 static void igmp6_join_group(struct ifmcaddr6 *ma); 130 static void igmp6_leave_group(struct ifmcaddr6 *ma); 131 static void igmp6_timer_handler(unsigned long data); 132 133 static void mld_gq_timer_expire(unsigned long data); 134 static void mld_ifc_timer_expire(unsigned long data); 135 static void mld_ifc_event(struct inet6_dev *idev); 136 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 137 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 138 static void mld_clear_delrec(struct inet6_dev *idev); 139 static int sf_setstate(struct ifmcaddr6 *pmc); 140 static void sf_markstate(struct ifmcaddr6 *pmc); 141 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 142 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 143 int sfmode, int sfcount, struct in6_addr *psfsrc, 144 int delta); 145 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 146 int sfmode, int sfcount, struct in6_addr *psfsrc, 147 int delta); 148 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 149 struct inet6_dev *idev); 150 151 152 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 153 #define MLD_QRV_DEFAULT 2 154 155 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \ 156 (idev)->cnf.force_mld_version == 1 || \ 157 ((idev)->mc_v1_seen && \ 158 time_before(jiffies, (idev)->mc_v1_seen))) 159 160 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 161 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 162 ((value) < (thresh) ? (value) : \ 163 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \ 164 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 165 166 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) 167 168 #define IPV6_MLD_MAX_MSF 64 169 170 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 171 172 /* 173 * socket join on multicast group 174 */ 175 176 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 177 { 178 struct net_device *dev = NULL; 179 struct ipv6_mc_socklist *mc_lst; 180 struct ipv6_pinfo *np = inet6_sk(sk); 181 struct net *net = sock_net(sk); 182 int err; 183 184 if (!ipv6_addr_is_multicast(addr)) 185 return -EINVAL; 186 187 read_lock_bh(&ipv6_sk_mc_lock); 188 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 189 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 190 ipv6_addr_equal(&mc_lst->addr, addr)) { 191 read_unlock_bh(&ipv6_sk_mc_lock); 192 return -EADDRINUSE; 193 } 194 } 195 read_unlock_bh(&ipv6_sk_mc_lock); 196 197 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 198 199 if (mc_lst == NULL) 200 return -ENOMEM; 201 202 mc_lst->next = NULL; 203 ipv6_addr_copy(&mc_lst->addr, addr); 204 205 if (ifindex == 0) { 206 struct rt6_info *rt; 207 rt = rt6_lookup(net, addr, NULL, 0, 0); 208 if (rt) { 209 dev = rt->rt6i_dev; 210 dev_hold(dev); 211 dst_release(&rt->u.dst); 212 } 213 } else 214 dev = dev_get_by_index(net, ifindex); 215 216 if (dev == NULL) { 217 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 218 return -ENODEV; 219 } 220 221 mc_lst->ifindex = dev->ifindex; 222 mc_lst->sfmode = MCAST_EXCLUDE; 223 rwlock_init(&mc_lst->sflock); 224 mc_lst->sflist = NULL; 225 226 /* 227 * now add/increase the group membership on the device 228 */ 229 230 err = ipv6_dev_mc_inc(dev, addr); 231 232 if (err) { 233 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 234 dev_put(dev); 235 return err; 236 } 237 238 write_lock_bh(&ipv6_sk_mc_lock); 239 mc_lst->next = np->ipv6_mc_list; 240 np->ipv6_mc_list = mc_lst; 241 write_unlock_bh(&ipv6_sk_mc_lock); 242 243 dev_put(dev); 244 245 return 0; 246 } 247 248 /* 249 * socket leave on multicast group 250 */ 251 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 252 { 253 struct ipv6_pinfo *np = inet6_sk(sk); 254 struct ipv6_mc_socklist *mc_lst, **lnk; 255 struct net *net = sock_net(sk); 256 257 write_lock_bh(&ipv6_sk_mc_lock); 258 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { 259 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 260 ipv6_addr_equal(&mc_lst->addr, addr)) { 261 struct net_device *dev; 262 263 *lnk = mc_lst->next; 264 write_unlock_bh(&ipv6_sk_mc_lock); 265 266 dev = dev_get_by_index(net, mc_lst->ifindex); 267 if (dev != NULL) { 268 struct inet6_dev *idev = in6_dev_get(dev); 269 270 (void) ip6_mc_leave_src(sk, mc_lst, idev); 271 if (idev) { 272 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 273 in6_dev_put(idev); 274 } 275 dev_put(dev); 276 } else 277 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 278 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 279 return 0; 280 } 281 } 282 write_unlock_bh(&ipv6_sk_mc_lock); 283 284 return -EADDRNOTAVAIL; 285 } 286 287 static struct inet6_dev *ip6_mc_find_dev(struct net *net, 288 struct in6_addr *group, 289 int ifindex) 290 { 291 struct net_device *dev = NULL; 292 struct inet6_dev *idev = NULL; 293 294 if (ifindex == 0) { 295 struct rt6_info *rt; 296 297 rt = rt6_lookup(net, group, NULL, 0, 0); 298 if (rt) { 299 dev = rt->rt6i_dev; 300 dev_hold(dev); 301 dst_release(&rt->u.dst); 302 } 303 } else 304 dev = dev_get_by_index(net, ifindex); 305 306 if (!dev) 307 goto nodev; 308 idev = in6_dev_get(dev); 309 if (!idev) 310 goto release; 311 read_lock_bh(&idev->lock); 312 if (idev->dead) 313 goto unlock_release; 314 315 return idev; 316 317 unlock_release: 318 read_unlock_bh(&idev->lock); 319 in6_dev_put(idev); 320 release: 321 dev_put(dev); 322 nodev: 323 return NULL; 324 } 325 326 void ipv6_sock_mc_close(struct sock *sk) 327 { 328 struct ipv6_pinfo *np = inet6_sk(sk); 329 struct ipv6_mc_socklist *mc_lst; 330 struct net *net = sock_net(sk); 331 332 write_lock_bh(&ipv6_sk_mc_lock); 333 while ((mc_lst = np->ipv6_mc_list) != NULL) { 334 struct net_device *dev; 335 336 np->ipv6_mc_list = mc_lst->next; 337 write_unlock_bh(&ipv6_sk_mc_lock); 338 339 dev = dev_get_by_index(net, mc_lst->ifindex); 340 if (dev) { 341 struct inet6_dev *idev = in6_dev_get(dev); 342 343 (void) ip6_mc_leave_src(sk, mc_lst, idev); 344 if (idev) { 345 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 346 in6_dev_put(idev); 347 } 348 dev_put(dev); 349 } else 350 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 351 352 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 353 354 write_lock_bh(&ipv6_sk_mc_lock); 355 } 356 write_unlock_bh(&ipv6_sk_mc_lock); 357 } 358 359 int ip6_mc_source(int add, int omode, struct sock *sk, 360 struct group_source_req *pgsr) 361 { 362 struct in6_addr *source, *group; 363 struct ipv6_mc_socklist *pmc; 364 struct net_device *dev; 365 struct inet6_dev *idev; 366 struct ipv6_pinfo *inet6 = inet6_sk(sk); 367 struct ip6_sf_socklist *psl; 368 struct net *net = sock_net(sk); 369 int i, j, rv; 370 int leavegroup = 0; 371 int pmclocked = 0; 372 int err; 373 374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 376 377 if (!ipv6_addr_is_multicast(group)) 378 return -EINVAL; 379 380 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface); 381 if (!idev) 382 return -ENODEV; 383 dev = idev->dev; 384 385 err = -EADDRNOTAVAIL; 386 387 read_lock_bh(&ipv6_sk_mc_lock); 388 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 389 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 390 continue; 391 if (ipv6_addr_equal(&pmc->addr, group)) 392 break; 393 } 394 if (!pmc) { /* must have a prior join */ 395 err = -EINVAL; 396 goto done; 397 } 398 /* if a source filter was set, must be the same mode as before */ 399 if (pmc->sflist) { 400 if (pmc->sfmode != omode) { 401 err = -EINVAL; 402 goto done; 403 } 404 } else if (pmc->sfmode != omode) { 405 /* allow mode switches for empty-set filters */ 406 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 407 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 408 pmc->sfmode = omode; 409 } 410 411 write_lock_bh(&pmc->sflock); 412 pmclocked = 1; 413 414 psl = pmc->sflist; 415 if (!add) { 416 if (!psl) 417 goto done; /* err = -EADDRNOTAVAIL */ 418 rv = !0; 419 for (i=0; i<psl->sl_count; i++) { 420 rv = memcmp(&psl->sl_addr[i], source, 421 sizeof(struct in6_addr)); 422 if (rv == 0) 423 break; 424 } 425 if (rv) /* source not found */ 426 goto done; /* err = -EADDRNOTAVAIL */ 427 428 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 429 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 430 leavegroup = 1; 431 goto done; 432 } 433 434 /* update the interface filter */ 435 ip6_mc_del_src(idev, group, omode, 1, source, 1); 436 437 for (j=i+1; j<psl->sl_count; j++) 438 psl->sl_addr[j-1] = psl->sl_addr[j]; 439 psl->sl_count--; 440 err = 0; 441 goto done; 442 } 443 /* else, add a new source to the filter */ 444 445 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 446 err = -ENOBUFS; 447 goto done; 448 } 449 if (!psl || psl->sl_count == psl->sl_max) { 450 struct ip6_sf_socklist *newpsl; 451 int count = IP6_SFBLOCK; 452 453 if (psl) 454 count += psl->sl_max; 455 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 456 if (!newpsl) { 457 err = -ENOBUFS; 458 goto done; 459 } 460 newpsl->sl_max = count; 461 newpsl->sl_count = count - IP6_SFBLOCK; 462 if (psl) { 463 for (i=0; i<psl->sl_count; i++) 464 newpsl->sl_addr[i] = psl->sl_addr[i]; 465 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 466 } 467 pmc->sflist = psl = newpsl; 468 } 469 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 470 for (i=0; i<psl->sl_count; i++) { 471 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 472 if (rv == 0) 473 break; 474 } 475 if (rv == 0) /* address already there is an error */ 476 goto done; 477 for (j=psl->sl_count-1; j>=i; j--) 478 psl->sl_addr[j+1] = psl->sl_addr[j]; 479 psl->sl_addr[i] = *source; 480 psl->sl_count++; 481 err = 0; 482 /* update the interface list */ 483 ip6_mc_add_src(idev, group, omode, 1, source, 1); 484 done: 485 if (pmclocked) 486 write_unlock_bh(&pmc->sflock); 487 read_unlock_bh(&ipv6_sk_mc_lock); 488 read_unlock_bh(&idev->lock); 489 in6_dev_put(idev); 490 dev_put(dev); 491 if (leavegroup) 492 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 493 return err; 494 } 495 496 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 497 { 498 struct in6_addr *group; 499 struct ipv6_mc_socklist *pmc; 500 struct net_device *dev; 501 struct inet6_dev *idev; 502 struct ipv6_pinfo *inet6 = inet6_sk(sk); 503 struct ip6_sf_socklist *newpsl, *psl; 504 struct net *net = sock_net(sk); 505 int leavegroup = 0; 506 int i, err; 507 508 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 509 510 if (!ipv6_addr_is_multicast(group)) 511 return -EINVAL; 512 if (gsf->gf_fmode != MCAST_INCLUDE && 513 gsf->gf_fmode != MCAST_EXCLUDE) 514 return -EINVAL; 515 516 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 517 518 if (!idev) 519 return -ENODEV; 520 dev = idev->dev; 521 522 err = 0; 523 read_lock_bh(&ipv6_sk_mc_lock); 524 525 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 526 leavegroup = 1; 527 goto done; 528 } 529 530 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 531 if (pmc->ifindex != gsf->gf_interface) 532 continue; 533 if (ipv6_addr_equal(&pmc->addr, group)) 534 break; 535 } 536 if (!pmc) { /* must have a prior join */ 537 err = -EINVAL; 538 goto done; 539 } 540 if (gsf->gf_numsrc) { 541 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 542 GFP_ATOMIC); 543 if (!newpsl) { 544 err = -ENOBUFS; 545 goto done; 546 } 547 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 548 for (i=0; i<newpsl->sl_count; ++i) { 549 struct sockaddr_in6 *psin6; 550 551 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 552 newpsl->sl_addr[i] = psin6->sin6_addr; 553 } 554 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 555 newpsl->sl_count, newpsl->sl_addr, 0); 556 if (err) { 557 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 558 goto done; 559 } 560 } else { 561 newpsl = NULL; 562 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 563 } 564 565 write_lock_bh(&pmc->sflock); 566 psl = pmc->sflist; 567 if (psl) { 568 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 569 psl->sl_count, psl->sl_addr, 0); 570 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 571 } else 572 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 573 pmc->sflist = newpsl; 574 pmc->sfmode = gsf->gf_fmode; 575 write_unlock_bh(&pmc->sflock); 576 err = 0; 577 done: 578 read_unlock_bh(&ipv6_sk_mc_lock); 579 read_unlock_bh(&idev->lock); 580 in6_dev_put(idev); 581 dev_put(dev); 582 if (leavegroup) 583 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 584 return err; 585 } 586 587 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 588 struct group_filter __user *optval, int __user *optlen) 589 { 590 int err, i, count, copycount; 591 struct in6_addr *group; 592 struct ipv6_mc_socklist *pmc; 593 struct inet6_dev *idev; 594 struct net_device *dev; 595 struct ipv6_pinfo *inet6 = inet6_sk(sk); 596 struct ip6_sf_socklist *psl; 597 struct net *net = sock_net(sk); 598 599 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 600 601 if (!ipv6_addr_is_multicast(group)) 602 return -EINVAL; 603 604 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 605 606 if (!idev) 607 return -ENODEV; 608 609 dev = idev->dev; 610 611 err = -EADDRNOTAVAIL; 612 /* 613 * changes to the ipv6_mc_list require the socket lock and 614 * a read lock on ip6_sk_mc_lock. We have the socket lock, 615 * so reading the list is safe. 616 */ 617 618 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 619 if (pmc->ifindex != gsf->gf_interface) 620 continue; 621 if (ipv6_addr_equal(group, &pmc->addr)) 622 break; 623 } 624 if (!pmc) /* must have a prior join */ 625 goto done; 626 gsf->gf_fmode = pmc->sfmode; 627 psl = pmc->sflist; 628 count = psl ? psl->sl_count : 0; 629 read_unlock_bh(&idev->lock); 630 in6_dev_put(idev); 631 dev_put(dev); 632 633 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 634 gsf->gf_numsrc = count; 635 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 636 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 637 return -EFAULT; 638 } 639 /* changes to psl require the socket lock, a read lock on 640 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 641 * have the socket lock, so reading here is safe. 642 */ 643 for (i=0; i<copycount; i++) { 644 struct sockaddr_in6 *psin6; 645 struct sockaddr_storage ss; 646 647 psin6 = (struct sockaddr_in6 *)&ss; 648 memset(&ss, 0, sizeof(ss)); 649 psin6->sin6_family = AF_INET6; 650 psin6->sin6_addr = psl->sl_addr[i]; 651 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 652 return -EFAULT; 653 } 654 return 0; 655 done: 656 read_unlock_bh(&idev->lock); 657 in6_dev_put(idev); 658 dev_put(dev); 659 return err; 660 } 661 662 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 663 const struct in6_addr *src_addr) 664 { 665 struct ipv6_pinfo *np = inet6_sk(sk); 666 struct ipv6_mc_socklist *mc; 667 struct ip6_sf_socklist *psl; 668 int rv = 1; 669 670 read_lock(&ipv6_sk_mc_lock); 671 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 672 if (ipv6_addr_equal(&mc->addr, mc_addr)) 673 break; 674 } 675 if (!mc) { 676 read_unlock(&ipv6_sk_mc_lock); 677 return 1; 678 } 679 read_lock(&mc->sflock); 680 psl = mc->sflist; 681 if (!psl) { 682 rv = mc->sfmode == MCAST_EXCLUDE; 683 } else { 684 int i; 685 686 for (i=0; i<psl->sl_count; i++) { 687 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 688 break; 689 } 690 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 691 rv = 0; 692 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 693 rv = 0; 694 } 695 read_unlock(&mc->sflock); 696 read_unlock(&ipv6_sk_mc_lock); 697 698 return rv; 699 } 700 701 static void ma_put(struct ifmcaddr6 *mc) 702 { 703 if (atomic_dec_and_test(&mc->mca_refcnt)) { 704 in6_dev_put(mc->idev); 705 kfree(mc); 706 } 707 } 708 709 static void igmp6_group_added(struct ifmcaddr6 *mc) 710 { 711 struct net_device *dev = mc->idev->dev; 712 char buf[MAX_ADDR_LEN]; 713 714 spin_lock_bh(&mc->mca_lock); 715 if (!(mc->mca_flags&MAF_LOADED)) { 716 mc->mca_flags |= MAF_LOADED; 717 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 718 dev_mc_add(dev, buf, dev->addr_len, 0); 719 } 720 spin_unlock_bh(&mc->mca_lock); 721 722 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 723 return; 724 725 if (MLD_V1_SEEN(mc->idev)) { 726 igmp6_join_group(mc); 727 return; 728 } 729 /* else v2 */ 730 731 mc->mca_crcount = mc->idev->mc_qrv; 732 mld_ifc_event(mc->idev); 733 } 734 735 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 736 { 737 struct net_device *dev = mc->idev->dev; 738 char buf[MAX_ADDR_LEN]; 739 740 spin_lock_bh(&mc->mca_lock); 741 if (mc->mca_flags&MAF_LOADED) { 742 mc->mca_flags &= ~MAF_LOADED; 743 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 744 dev_mc_delete(dev, buf, dev->addr_len, 0); 745 } 746 747 if (mc->mca_flags & MAF_NOREPORT) 748 goto done; 749 spin_unlock_bh(&mc->mca_lock); 750 751 if (!mc->idev->dead) 752 igmp6_leave_group(mc); 753 754 spin_lock_bh(&mc->mca_lock); 755 if (del_timer(&mc->mca_timer)) 756 atomic_dec(&mc->mca_refcnt); 757 done: 758 ip6_mc_clear_src(mc); 759 spin_unlock_bh(&mc->mca_lock); 760 } 761 762 /* 763 * deleted ifmcaddr6 manipulation 764 */ 765 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 766 { 767 struct ifmcaddr6 *pmc; 768 769 /* this is an "ifmcaddr6" for convenience; only the fields below 770 * are actually used. In particular, the refcnt and users are not 771 * used for management of the delete list. Using the same structure 772 * for deleted items allows change reports to use common code with 773 * non-deleted or query-response MCA's. 774 */ 775 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 776 if (!pmc) 777 return; 778 779 spin_lock_bh(&im->mca_lock); 780 spin_lock_init(&pmc->mca_lock); 781 pmc->idev = im->idev; 782 in6_dev_hold(idev); 783 pmc->mca_addr = im->mca_addr; 784 pmc->mca_crcount = idev->mc_qrv; 785 pmc->mca_sfmode = im->mca_sfmode; 786 if (pmc->mca_sfmode == MCAST_INCLUDE) { 787 struct ip6_sf_list *psf; 788 789 pmc->mca_tomb = im->mca_tomb; 790 pmc->mca_sources = im->mca_sources; 791 im->mca_tomb = im->mca_sources = NULL; 792 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 793 psf->sf_crcount = pmc->mca_crcount; 794 } 795 spin_unlock_bh(&im->mca_lock); 796 797 spin_lock_bh(&idev->mc_lock); 798 pmc->next = idev->mc_tomb; 799 idev->mc_tomb = pmc; 800 spin_unlock_bh(&idev->mc_lock); 801 } 802 803 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 804 { 805 struct ifmcaddr6 *pmc, *pmc_prev; 806 struct ip6_sf_list *psf, *psf_next; 807 808 spin_lock_bh(&idev->mc_lock); 809 pmc_prev = NULL; 810 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 811 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 812 break; 813 pmc_prev = pmc; 814 } 815 if (pmc) { 816 if (pmc_prev) 817 pmc_prev->next = pmc->next; 818 else 819 idev->mc_tomb = pmc->next; 820 } 821 spin_unlock_bh(&idev->mc_lock); 822 823 if (pmc) { 824 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 825 psf_next = psf->sf_next; 826 kfree(psf); 827 } 828 in6_dev_put(pmc->idev); 829 kfree(pmc); 830 } 831 } 832 833 static void mld_clear_delrec(struct inet6_dev *idev) 834 { 835 struct ifmcaddr6 *pmc, *nextpmc; 836 837 spin_lock_bh(&idev->mc_lock); 838 pmc = idev->mc_tomb; 839 idev->mc_tomb = NULL; 840 spin_unlock_bh(&idev->mc_lock); 841 842 for (; pmc; pmc = nextpmc) { 843 nextpmc = pmc->next; 844 ip6_mc_clear_src(pmc); 845 in6_dev_put(pmc->idev); 846 kfree(pmc); 847 } 848 849 /* clear dead sources, too */ 850 read_lock_bh(&idev->lock); 851 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 852 struct ip6_sf_list *psf, *psf_next; 853 854 spin_lock_bh(&pmc->mca_lock); 855 psf = pmc->mca_tomb; 856 pmc->mca_tomb = NULL; 857 spin_unlock_bh(&pmc->mca_lock); 858 for (; psf; psf=psf_next) { 859 psf_next = psf->sf_next; 860 kfree(psf); 861 } 862 } 863 read_unlock_bh(&idev->lock); 864 } 865 866 867 /* 868 * device multicast group inc (add if not found) 869 */ 870 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 871 { 872 struct ifmcaddr6 *mc; 873 struct inet6_dev *idev; 874 875 idev = in6_dev_get(dev); 876 877 if (idev == NULL) 878 return -EINVAL; 879 880 write_lock_bh(&idev->lock); 881 if (idev->dead) { 882 write_unlock_bh(&idev->lock); 883 in6_dev_put(idev); 884 return -ENODEV; 885 } 886 887 for (mc = idev->mc_list; mc; mc = mc->next) { 888 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 889 mc->mca_users++; 890 write_unlock_bh(&idev->lock); 891 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 892 NULL, 0); 893 in6_dev_put(idev); 894 return 0; 895 } 896 } 897 898 /* 899 * not found: create a new one. 900 */ 901 902 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 903 904 if (mc == NULL) { 905 write_unlock_bh(&idev->lock); 906 in6_dev_put(idev); 907 return -ENOMEM; 908 } 909 910 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 911 912 ipv6_addr_copy(&mc->mca_addr, addr); 913 mc->idev = idev; 914 mc->mca_users = 1; 915 /* mca_stamp should be updated upon changes */ 916 mc->mca_cstamp = mc->mca_tstamp = jiffies; 917 atomic_set(&mc->mca_refcnt, 2); 918 spin_lock_init(&mc->mca_lock); 919 920 /* initial mode is (EX, empty) */ 921 mc->mca_sfmode = MCAST_EXCLUDE; 922 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 923 924 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 925 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 926 mc->mca_flags |= MAF_NOREPORT; 927 928 mc->next = idev->mc_list; 929 idev->mc_list = mc; 930 write_unlock_bh(&idev->lock); 931 932 mld_del_delrec(idev, &mc->mca_addr); 933 igmp6_group_added(mc); 934 ma_put(mc); 935 return 0; 936 } 937 938 /* 939 * device multicast group del 940 */ 941 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 942 { 943 struct ifmcaddr6 *ma, **map; 944 945 write_lock_bh(&idev->lock); 946 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 947 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 948 if (--ma->mca_users == 0) { 949 *map = ma->next; 950 write_unlock_bh(&idev->lock); 951 952 igmp6_group_dropped(ma); 953 954 ma_put(ma); 955 return 0; 956 } 957 write_unlock_bh(&idev->lock); 958 return 0; 959 } 960 } 961 write_unlock_bh(&idev->lock); 962 963 return -ENOENT; 964 } 965 966 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 967 { 968 struct inet6_dev *idev = in6_dev_get(dev); 969 int err; 970 971 if (!idev) 972 return -ENODEV; 973 974 err = __ipv6_dev_mc_dec(idev, addr); 975 976 in6_dev_put(idev); 977 978 return err; 979 } 980 981 /* 982 * identify MLD packets for MLD filter exceptions 983 */ 984 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 985 { 986 struct icmp6hdr *pic; 987 988 if (nexthdr != IPPROTO_ICMPV6) 989 return 0; 990 991 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 992 return 0; 993 994 pic = icmp6_hdr(skb); 995 996 switch (pic->icmp6_type) { 997 case ICMPV6_MGM_QUERY: 998 case ICMPV6_MGM_REPORT: 999 case ICMPV6_MGM_REDUCTION: 1000 case ICMPV6_MLD2_REPORT: 1001 return 1; 1002 default: 1003 break; 1004 } 1005 return 0; 1006 } 1007 1008 /* 1009 * check if the interface/address pair is valid 1010 */ 1011 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1012 const struct in6_addr *src_addr) 1013 { 1014 struct inet6_dev *idev; 1015 struct ifmcaddr6 *mc; 1016 int rv = 0; 1017 1018 idev = in6_dev_get(dev); 1019 if (idev) { 1020 read_lock_bh(&idev->lock); 1021 for (mc = idev->mc_list; mc; mc=mc->next) { 1022 if (ipv6_addr_equal(&mc->mca_addr, group)) 1023 break; 1024 } 1025 if (mc) { 1026 if (src_addr && !ipv6_addr_any(src_addr)) { 1027 struct ip6_sf_list *psf; 1028 1029 spin_lock_bh(&mc->mca_lock); 1030 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1031 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1032 break; 1033 } 1034 if (psf) 1035 rv = psf->sf_count[MCAST_INCLUDE] || 1036 psf->sf_count[MCAST_EXCLUDE] != 1037 mc->mca_sfcount[MCAST_EXCLUDE]; 1038 else 1039 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1040 spin_unlock_bh(&mc->mca_lock); 1041 } else 1042 rv = 1; /* don't filter unspecified source */ 1043 } 1044 read_unlock_bh(&idev->lock); 1045 in6_dev_put(idev); 1046 } 1047 return rv; 1048 } 1049 1050 static void mld_gq_start_timer(struct inet6_dev *idev) 1051 { 1052 int tv = net_random() % idev->mc_maxdelay; 1053 1054 idev->mc_gq_running = 1; 1055 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1056 in6_dev_hold(idev); 1057 } 1058 1059 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1060 { 1061 int tv = net_random() % delay; 1062 1063 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1064 in6_dev_hold(idev); 1065 } 1066 1067 /* 1068 * IGMP handling (alias multicast ICMPv6 messages) 1069 */ 1070 1071 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1072 { 1073 unsigned long delay = resptime; 1074 1075 /* Do not start timer for these addresses */ 1076 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1077 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1078 return; 1079 1080 if (del_timer(&ma->mca_timer)) { 1081 atomic_dec(&ma->mca_refcnt); 1082 delay = ma->mca_timer.expires - jiffies; 1083 } 1084 1085 if (delay >= resptime) { 1086 if (resptime) 1087 delay = net_random() % resptime; 1088 else 1089 delay = 1; 1090 } 1091 ma->mca_timer.expires = jiffies + delay; 1092 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1093 atomic_inc(&ma->mca_refcnt); 1094 ma->mca_flags |= MAF_TIMER_RUNNING; 1095 } 1096 1097 /* mark EXCLUDE-mode sources */ 1098 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1099 struct in6_addr *srcs) 1100 { 1101 struct ip6_sf_list *psf; 1102 int i, scount; 1103 1104 scount = 0; 1105 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1106 if (scount == nsrcs) 1107 break; 1108 for (i=0; i<nsrcs; i++) { 1109 /* skip inactive filters */ 1110 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1111 pmc->mca_sfcount[MCAST_EXCLUDE] != 1112 psf->sf_count[MCAST_EXCLUDE]) 1113 continue; 1114 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1115 scount++; 1116 break; 1117 } 1118 } 1119 } 1120 pmc->mca_flags &= ~MAF_GSQUERY; 1121 if (scount == nsrcs) /* all sources excluded */ 1122 return 0; 1123 return 1; 1124 } 1125 1126 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1127 struct in6_addr *srcs) 1128 { 1129 struct ip6_sf_list *psf; 1130 int i, scount; 1131 1132 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1133 return mld_xmarksources(pmc, nsrcs, srcs); 1134 1135 /* mark INCLUDE-mode sources */ 1136 1137 scount = 0; 1138 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1139 if (scount == nsrcs) 1140 break; 1141 for (i=0; i<nsrcs; i++) { 1142 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1143 psf->sf_gsresp = 1; 1144 scount++; 1145 break; 1146 } 1147 } 1148 } 1149 if (!scount) { 1150 pmc->mca_flags &= ~MAF_GSQUERY; 1151 return 0; 1152 } 1153 pmc->mca_flags |= MAF_GSQUERY; 1154 return 1; 1155 } 1156 1157 int igmp6_event_query(struct sk_buff *skb) 1158 { 1159 struct mld2_query *mlh2 = NULL; 1160 struct ifmcaddr6 *ma; 1161 struct in6_addr *group; 1162 unsigned long max_delay; 1163 struct inet6_dev *idev; 1164 struct icmp6hdr *hdr; 1165 int group_type; 1166 int mark = 0; 1167 int len; 1168 1169 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1170 return -EINVAL; 1171 1172 /* compute payload length excluding extension headers */ 1173 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1174 len -= skb_network_header_len(skb); 1175 1176 /* Drop queries with not link local source */ 1177 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1178 return -EINVAL; 1179 1180 idev = in6_dev_get(skb->dev); 1181 1182 if (idev == NULL) 1183 return 0; 1184 1185 hdr = icmp6_hdr(skb); 1186 group = (struct in6_addr *) (hdr + 1); 1187 group_type = ipv6_addr_type(group); 1188 1189 if (group_type != IPV6_ADDR_ANY && 1190 !(group_type&IPV6_ADDR_MULTICAST)) { 1191 in6_dev_put(idev); 1192 return -EINVAL; 1193 } 1194 1195 if (len == 24) { 1196 int switchback; 1197 /* MLDv1 router present */ 1198 1199 /* Translate milliseconds to jiffies */ 1200 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1201 1202 switchback = (idev->mc_qrv + 1) * max_delay; 1203 idev->mc_v1_seen = jiffies + switchback; 1204 1205 /* cancel the interface change timer */ 1206 idev->mc_ifc_count = 0; 1207 if (del_timer(&idev->mc_ifc_timer)) 1208 __in6_dev_put(idev); 1209 /* clear deleted report items */ 1210 mld_clear_delrec(idev); 1211 } else if (len >= 28) { 1212 int srcs_offset = sizeof(struct mld2_query) - 1213 sizeof(struct icmp6hdr); 1214 if (!pskb_may_pull(skb, srcs_offset)) { 1215 in6_dev_put(idev); 1216 return -EINVAL; 1217 } 1218 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1219 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1220 if (!max_delay) 1221 max_delay = 1; 1222 idev->mc_maxdelay = max_delay; 1223 if (mlh2->qrv) 1224 idev->mc_qrv = mlh2->qrv; 1225 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1226 if (mlh2->nsrcs) { 1227 in6_dev_put(idev); 1228 return -EINVAL; /* no sources allowed */ 1229 } 1230 mld_gq_start_timer(idev); 1231 in6_dev_put(idev); 1232 return 0; 1233 } 1234 /* mark sources to include, if group & source-specific */ 1235 if (mlh2->nsrcs != 0) { 1236 if (!pskb_may_pull(skb, srcs_offset + 1237 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1238 in6_dev_put(idev); 1239 return -EINVAL; 1240 } 1241 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1242 mark = 1; 1243 } 1244 } else { 1245 in6_dev_put(idev); 1246 return -EINVAL; 1247 } 1248 1249 read_lock_bh(&idev->lock); 1250 if (group_type == IPV6_ADDR_ANY) { 1251 for (ma = idev->mc_list; ma; ma=ma->next) { 1252 spin_lock_bh(&ma->mca_lock); 1253 igmp6_group_queried(ma, max_delay); 1254 spin_unlock_bh(&ma->mca_lock); 1255 } 1256 } else { 1257 for (ma = idev->mc_list; ma; ma=ma->next) { 1258 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1259 continue; 1260 spin_lock_bh(&ma->mca_lock); 1261 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1262 /* gsquery <- gsquery && mark */ 1263 if (!mark) 1264 ma->mca_flags &= ~MAF_GSQUERY; 1265 } else { 1266 /* gsquery <- mark */ 1267 if (mark) 1268 ma->mca_flags |= MAF_GSQUERY; 1269 else 1270 ma->mca_flags &= ~MAF_GSQUERY; 1271 } 1272 if (!(ma->mca_flags & MAF_GSQUERY) || 1273 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1274 igmp6_group_queried(ma, max_delay); 1275 spin_unlock_bh(&ma->mca_lock); 1276 break; 1277 } 1278 } 1279 read_unlock_bh(&idev->lock); 1280 in6_dev_put(idev); 1281 1282 return 0; 1283 } 1284 1285 1286 int igmp6_event_report(struct sk_buff *skb) 1287 { 1288 struct ifmcaddr6 *ma; 1289 struct in6_addr *addrp; 1290 struct inet6_dev *idev; 1291 struct icmp6hdr *hdr; 1292 int addr_type; 1293 1294 /* Our own report looped back. Ignore it. */ 1295 if (skb->pkt_type == PACKET_LOOPBACK) 1296 return 0; 1297 1298 /* send our report if the MC router may not have heard this report */ 1299 if (skb->pkt_type != PACKET_MULTICAST && 1300 skb->pkt_type != PACKET_BROADCAST) 1301 return 0; 1302 1303 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1304 return -EINVAL; 1305 1306 hdr = icmp6_hdr(skb); 1307 1308 /* Drop reports with not link local source */ 1309 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1310 if (addr_type != IPV6_ADDR_ANY && 1311 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1312 return -EINVAL; 1313 1314 addrp = (struct in6_addr *) (hdr + 1); 1315 1316 idev = in6_dev_get(skb->dev); 1317 if (idev == NULL) 1318 return -ENODEV; 1319 1320 /* 1321 * Cancel the timer for this group 1322 */ 1323 1324 read_lock_bh(&idev->lock); 1325 for (ma = idev->mc_list; ma; ma=ma->next) { 1326 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1327 spin_lock(&ma->mca_lock); 1328 if (del_timer(&ma->mca_timer)) 1329 atomic_dec(&ma->mca_refcnt); 1330 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1331 spin_unlock(&ma->mca_lock); 1332 break; 1333 } 1334 } 1335 read_unlock_bh(&idev->lock); 1336 in6_dev_put(idev); 1337 return 0; 1338 } 1339 1340 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1341 int gdeleted, int sdeleted) 1342 { 1343 switch (type) { 1344 case MLD2_MODE_IS_INCLUDE: 1345 case MLD2_MODE_IS_EXCLUDE: 1346 if (gdeleted || sdeleted) 1347 return 0; 1348 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1349 if (pmc->mca_sfmode == MCAST_INCLUDE) 1350 return 1; 1351 /* don't include if this source is excluded 1352 * in all filters 1353 */ 1354 if (psf->sf_count[MCAST_INCLUDE]) 1355 return type == MLD2_MODE_IS_INCLUDE; 1356 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1357 psf->sf_count[MCAST_EXCLUDE]; 1358 } 1359 return 0; 1360 case MLD2_CHANGE_TO_INCLUDE: 1361 if (gdeleted || sdeleted) 1362 return 0; 1363 return psf->sf_count[MCAST_INCLUDE] != 0; 1364 case MLD2_CHANGE_TO_EXCLUDE: 1365 if (gdeleted || sdeleted) 1366 return 0; 1367 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1368 psf->sf_count[MCAST_INCLUDE]) 1369 return 0; 1370 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1371 psf->sf_count[MCAST_EXCLUDE]; 1372 case MLD2_ALLOW_NEW_SOURCES: 1373 if (gdeleted || !psf->sf_crcount) 1374 return 0; 1375 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1376 case MLD2_BLOCK_OLD_SOURCES: 1377 if (pmc->mca_sfmode == MCAST_INCLUDE) 1378 return gdeleted || (psf->sf_crcount && sdeleted); 1379 return psf->sf_crcount && !gdeleted && !sdeleted; 1380 } 1381 return 0; 1382 } 1383 1384 static int 1385 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1386 { 1387 struct ip6_sf_list *psf; 1388 int scount = 0; 1389 1390 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1391 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1392 continue; 1393 scount++; 1394 } 1395 return scount; 1396 } 1397 1398 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1399 { 1400 struct net *net = dev_net(dev); 1401 struct sock *sk = net->ipv6.igmp_sk; 1402 struct sk_buff *skb; 1403 struct mld2_report *pmr; 1404 struct in6_addr addr_buf; 1405 const struct in6_addr *saddr; 1406 int err; 1407 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1408 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1409 IPV6_TLV_PADN, 0 }; 1410 1411 /* we assume size > sizeof(ra) here */ 1412 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err); 1413 1414 if (!skb) 1415 return NULL; 1416 1417 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1418 1419 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1420 /* <draft-ietf-magma-mld-source-05.txt>: 1421 * use unspecified address as the source address 1422 * when a valid link-local address is not available. 1423 */ 1424 saddr = &in6addr_any; 1425 } else 1426 saddr = &addr_buf; 1427 1428 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); 1429 1430 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1431 1432 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1433 skb_put(skb, sizeof(*pmr)); 1434 pmr = (struct mld2_report *)skb_transport_header(skb); 1435 pmr->type = ICMPV6_MLD2_REPORT; 1436 pmr->resv1 = 0; 1437 pmr->csum = 0; 1438 pmr->resv2 = 0; 1439 pmr->ngrec = 0; 1440 return skb; 1441 } 1442 1443 static void mld_sendpack(struct sk_buff *skb) 1444 { 1445 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1446 struct mld2_report *pmr = 1447 (struct mld2_report *)skb_transport_header(skb); 1448 int payload_len, mldlen; 1449 struct inet6_dev *idev = in6_dev_get(skb->dev); 1450 struct net *net = dev_net(skb->dev); 1451 int err; 1452 struct flowi fl; 1453 struct dst_entry *dst; 1454 1455 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); 1456 1457 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1458 mldlen = skb->tail - skb->transport_header; 1459 pip6->payload_len = htons(payload_len); 1460 1461 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1462 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), 1463 mldlen, 0)); 1464 1465 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1466 1467 if (!dst) { 1468 err = -ENOMEM; 1469 goto err_out; 1470 } 1471 1472 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT, 1473 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1474 skb->dev->ifindex); 1475 1476 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1477 skb_dst_set(skb, dst); 1478 if (err) 1479 goto err_out; 1480 1481 payload_len = skb->len; 1482 1483 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1484 dst_output); 1485 out: 1486 if (!err) { 1487 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT); 1488 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); 1489 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); 1490 } else 1491 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS); 1492 1493 if (likely(idev != NULL)) 1494 in6_dev_put(idev); 1495 return; 1496 1497 err_out: 1498 kfree_skb(skb); 1499 goto out; 1500 } 1501 1502 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1503 { 1504 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1505 } 1506 1507 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1508 int type, struct mld2_grec **ppgr) 1509 { 1510 struct net_device *dev = pmc->idev->dev; 1511 struct mld2_report *pmr; 1512 struct mld2_grec *pgr; 1513 1514 if (!skb) 1515 skb = mld_newpack(dev, dev->mtu); 1516 if (!skb) 1517 return NULL; 1518 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1519 pgr->grec_type = type; 1520 pgr->grec_auxwords = 0; 1521 pgr->grec_nsrcs = 0; 1522 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1523 pmr = (struct mld2_report *)skb_transport_header(skb); 1524 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1525 *ppgr = pgr; 1526 return skb; 1527 } 1528 1529 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1530 skb_tailroom(skb)) : 0) 1531 1532 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1533 int type, int gdeleted, int sdeleted) 1534 { 1535 struct net_device *dev = pmc->idev->dev; 1536 struct mld2_report *pmr; 1537 struct mld2_grec *pgr = NULL; 1538 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1539 int scount, stotal, first, isquery, truncate; 1540 1541 if (pmc->mca_flags & MAF_NOREPORT) 1542 return skb; 1543 1544 isquery = type == MLD2_MODE_IS_INCLUDE || 1545 type == MLD2_MODE_IS_EXCLUDE; 1546 truncate = type == MLD2_MODE_IS_EXCLUDE || 1547 type == MLD2_CHANGE_TO_EXCLUDE; 1548 1549 stotal = scount = 0; 1550 1551 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1552 1553 if (!*psf_list) 1554 goto empty_source; 1555 1556 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1557 1558 /* EX and TO_EX get a fresh packet, if needed */ 1559 if (truncate) { 1560 if (pmr && pmr->ngrec && 1561 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1562 if (skb) 1563 mld_sendpack(skb); 1564 skb = mld_newpack(dev, dev->mtu); 1565 } 1566 } 1567 first = 1; 1568 psf_prev = NULL; 1569 for (psf=*psf_list; psf; psf=psf_next) { 1570 struct in6_addr *psrc; 1571 1572 psf_next = psf->sf_next; 1573 1574 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1575 psf_prev = psf; 1576 continue; 1577 } 1578 1579 /* clear marks on query responses */ 1580 if (isquery) 1581 psf->sf_gsresp = 0; 1582 1583 if (AVAILABLE(skb) < sizeof(*psrc) + 1584 first*sizeof(struct mld2_grec)) { 1585 if (truncate && !first) 1586 break; /* truncate these */ 1587 if (pgr) 1588 pgr->grec_nsrcs = htons(scount); 1589 if (skb) 1590 mld_sendpack(skb); 1591 skb = mld_newpack(dev, dev->mtu); 1592 first = 1; 1593 scount = 0; 1594 } 1595 if (first) { 1596 skb = add_grhead(skb, pmc, type, &pgr); 1597 first = 0; 1598 } 1599 if (!skb) 1600 return NULL; 1601 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1602 *psrc = psf->sf_addr; 1603 scount++; stotal++; 1604 if ((type == MLD2_ALLOW_NEW_SOURCES || 1605 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1606 psf->sf_crcount--; 1607 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1608 if (psf_prev) 1609 psf_prev->sf_next = psf->sf_next; 1610 else 1611 *psf_list = psf->sf_next; 1612 kfree(psf); 1613 continue; 1614 } 1615 } 1616 psf_prev = psf; 1617 } 1618 1619 empty_source: 1620 if (!stotal) { 1621 if (type == MLD2_ALLOW_NEW_SOURCES || 1622 type == MLD2_BLOCK_OLD_SOURCES) 1623 return skb; 1624 if (pmc->mca_crcount || isquery) { 1625 /* make sure we have room for group header */ 1626 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1627 mld_sendpack(skb); 1628 skb = NULL; /* add_grhead will get a new one */ 1629 } 1630 skb = add_grhead(skb, pmc, type, &pgr); 1631 } 1632 } 1633 if (pgr) 1634 pgr->grec_nsrcs = htons(scount); 1635 1636 if (isquery) 1637 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1638 return skb; 1639 } 1640 1641 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1642 { 1643 struct sk_buff *skb = NULL; 1644 int type; 1645 1646 if (!pmc) { 1647 read_lock_bh(&idev->lock); 1648 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1649 if (pmc->mca_flags & MAF_NOREPORT) 1650 continue; 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 read_unlock_bh(&idev->lock); 1660 } else { 1661 spin_lock_bh(&pmc->mca_lock); 1662 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1663 type = MLD2_MODE_IS_EXCLUDE; 1664 else 1665 type = MLD2_MODE_IS_INCLUDE; 1666 skb = add_grec(skb, pmc, type, 0, 0); 1667 spin_unlock_bh(&pmc->mca_lock); 1668 } 1669 if (skb) 1670 mld_sendpack(skb); 1671 } 1672 1673 /* 1674 * remove zero-count source records from a source filter list 1675 */ 1676 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1677 { 1678 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1679 1680 psf_prev = NULL; 1681 for (psf=*ppsf; psf; psf = psf_next) { 1682 psf_next = psf->sf_next; 1683 if (psf->sf_crcount == 0) { 1684 if (psf_prev) 1685 psf_prev->sf_next = psf->sf_next; 1686 else 1687 *ppsf = psf->sf_next; 1688 kfree(psf); 1689 } else 1690 psf_prev = psf; 1691 } 1692 } 1693 1694 static void mld_send_cr(struct inet6_dev *idev) 1695 { 1696 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1697 struct sk_buff *skb = NULL; 1698 int type, dtype; 1699 1700 read_lock_bh(&idev->lock); 1701 spin_lock(&idev->mc_lock); 1702 1703 /* deleted MCA's */ 1704 pmc_prev = NULL; 1705 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1706 pmc_next = pmc->next; 1707 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1708 type = MLD2_BLOCK_OLD_SOURCES; 1709 dtype = MLD2_BLOCK_OLD_SOURCES; 1710 skb = add_grec(skb, pmc, type, 1, 0); 1711 skb = add_grec(skb, pmc, dtype, 1, 1); 1712 } 1713 if (pmc->mca_crcount) { 1714 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1715 type = MLD2_CHANGE_TO_INCLUDE; 1716 skb = add_grec(skb, pmc, type, 1, 0); 1717 } 1718 pmc->mca_crcount--; 1719 if (pmc->mca_crcount == 0) { 1720 mld_clear_zeros(&pmc->mca_tomb); 1721 mld_clear_zeros(&pmc->mca_sources); 1722 } 1723 } 1724 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1725 !pmc->mca_sources) { 1726 if (pmc_prev) 1727 pmc_prev->next = pmc_next; 1728 else 1729 idev->mc_tomb = pmc_next; 1730 in6_dev_put(pmc->idev); 1731 kfree(pmc); 1732 } else 1733 pmc_prev = pmc; 1734 } 1735 spin_unlock(&idev->mc_lock); 1736 1737 /* change recs */ 1738 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1739 spin_lock_bh(&pmc->mca_lock); 1740 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1741 type = MLD2_BLOCK_OLD_SOURCES; 1742 dtype = MLD2_ALLOW_NEW_SOURCES; 1743 } else { 1744 type = MLD2_ALLOW_NEW_SOURCES; 1745 dtype = MLD2_BLOCK_OLD_SOURCES; 1746 } 1747 skb = add_grec(skb, pmc, type, 0, 0); 1748 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1749 1750 /* filter mode changes */ 1751 if (pmc->mca_crcount) { 1752 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1753 type = MLD2_CHANGE_TO_EXCLUDE; 1754 else 1755 type = MLD2_CHANGE_TO_INCLUDE; 1756 skb = add_grec(skb, pmc, type, 0, 0); 1757 pmc->mca_crcount--; 1758 } 1759 spin_unlock_bh(&pmc->mca_lock); 1760 } 1761 read_unlock_bh(&idev->lock); 1762 if (!skb) 1763 return; 1764 (void) mld_sendpack(skb); 1765 } 1766 1767 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1768 { 1769 struct net *net = dev_net(dev); 1770 struct sock *sk = net->ipv6.igmp_sk; 1771 struct inet6_dev *idev; 1772 struct sk_buff *skb; 1773 struct icmp6hdr *hdr; 1774 const struct in6_addr *snd_addr, *saddr; 1775 struct in6_addr *addrp; 1776 struct in6_addr addr_buf; 1777 int err, len, payload_len, full_len; 1778 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1779 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1780 IPV6_TLV_PADN, 0 }; 1781 struct flowi fl; 1782 struct dst_entry *dst; 1783 1784 if (type == ICMPV6_MGM_REDUCTION) 1785 snd_addr = &in6addr_linklocal_allrouters; 1786 else 1787 snd_addr = addr; 1788 1789 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1790 payload_len = len + sizeof(ra); 1791 full_len = sizeof(struct ipv6hdr) + payload_len; 1792 1793 rcu_read_lock(); 1794 IP6_UPD_PO_STATS(net, __in6_dev_get(dev), 1795 IPSTATS_MIB_OUT, full_len); 1796 rcu_read_unlock(); 1797 1798 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err); 1799 1800 if (skb == NULL) { 1801 rcu_read_lock(); 1802 IP6_INC_STATS(net, __in6_dev_get(dev), 1803 IPSTATS_MIB_OUTDISCARDS); 1804 rcu_read_unlock(); 1805 return; 1806 } 1807 1808 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1809 1810 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1811 /* <draft-ietf-magma-mld-source-05.txt>: 1812 * use unspecified address as the source address 1813 * when a valid link-local address is not available. 1814 */ 1815 saddr = &in6addr_any; 1816 } else 1817 saddr = &addr_buf; 1818 1819 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); 1820 1821 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1822 1823 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1824 memset(hdr, 0, sizeof(struct icmp6hdr)); 1825 hdr->icmp6_type = type; 1826 1827 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1828 ipv6_addr_copy(addrp, addr); 1829 1830 hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len, 1831 IPPROTO_ICMPV6, 1832 csum_partial(hdr, len, 0)); 1833 1834 idev = in6_dev_get(skb->dev); 1835 1836 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1837 if (!dst) { 1838 err = -ENOMEM; 1839 goto err_out; 1840 } 1841 1842 icmpv6_flow_init(sk, &fl, type, 1843 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1844 skb->dev->ifindex); 1845 1846 err = xfrm_lookup(net, &dst, &fl, NULL, 0); 1847 if (err) 1848 goto err_out; 1849 1850 skb_dst_set(skb, dst); 1851 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1852 dst_output); 1853 out: 1854 if (!err) { 1855 ICMP6MSGOUT_INC_STATS(net, idev, type); 1856 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); 1857 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); 1858 } else 1859 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); 1860 1861 if (likely(idev != NULL)) 1862 in6_dev_put(idev); 1863 return; 1864 1865 err_out: 1866 kfree_skb(skb); 1867 goto out; 1868 } 1869 1870 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1871 struct in6_addr *psfsrc) 1872 { 1873 struct ip6_sf_list *psf, *psf_prev; 1874 int rv = 0; 1875 1876 psf_prev = NULL; 1877 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1878 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1879 break; 1880 psf_prev = psf; 1881 } 1882 if (!psf || psf->sf_count[sfmode] == 0) { 1883 /* source filter not found, or count wrong => bug */ 1884 return -ESRCH; 1885 } 1886 psf->sf_count[sfmode]--; 1887 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1888 struct inet6_dev *idev = pmc->idev; 1889 1890 /* no more filters for this source */ 1891 if (psf_prev) 1892 psf_prev->sf_next = psf->sf_next; 1893 else 1894 pmc->mca_sources = psf->sf_next; 1895 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1896 !MLD_V1_SEEN(idev)) { 1897 psf->sf_crcount = idev->mc_qrv; 1898 psf->sf_next = pmc->mca_tomb; 1899 pmc->mca_tomb = psf; 1900 rv = 1; 1901 } else 1902 kfree(psf); 1903 } 1904 return rv; 1905 } 1906 1907 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1908 int sfmode, int sfcount, struct in6_addr *psfsrc, 1909 int delta) 1910 { 1911 struct ifmcaddr6 *pmc; 1912 int changerec = 0; 1913 int i, err; 1914 1915 if (!idev) 1916 return -ENODEV; 1917 read_lock_bh(&idev->lock); 1918 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1919 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1920 break; 1921 } 1922 if (!pmc) { 1923 /* MCA not found?? bug */ 1924 read_unlock_bh(&idev->lock); 1925 return -ESRCH; 1926 } 1927 spin_lock_bh(&pmc->mca_lock); 1928 sf_markstate(pmc); 1929 if (!delta) { 1930 if (!pmc->mca_sfcount[sfmode]) { 1931 spin_unlock_bh(&pmc->mca_lock); 1932 read_unlock_bh(&idev->lock); 1933 return -EINVAL; 1934 } 1935 pmc->mca_sfcount[sfmode]--; 1936 } 1937 err = 0; 1938 for (i=0; i<sfcount; i++) { 1939 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1940 1941 changerec |= rv > 0; 1942 if (!err && rv < 0) 1943 err = rv; 1944 } 1945 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1946 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1947 pmc->mca_sfcount[MCAST_INCLUDE]) { 1948 struct ip6_sf_list *psf; 1949 1950 /* filter mode change */ 1951 pmc->mca_sfmode = MCAST_INCLUDE; 1952 pmc->mca_crcount = idev->mc_qrv; 1953 idev->mc_ifc_count = pmc->mca_crcount; 1954 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1955 psf->sf_crcount = 0; 1956 mld_ifc_event(pmc->idev); 1957 } else if (sf_setstate(pmc) || changerec) 1958 mld_ifc_event(pmc->idev); 1959 spin_unlock_bh(&pmc->mca_lock); 1960 read_unlock_bh(&idev->lock); 1961 return err; 1962 } 1963 1964 /* 1965 * Add multicast single-source filter to the interface list 1966 */ 1967 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1968 struct in6_addr *psfsrc, int delta) 1969 { 1970 struct ip6_sf_list *psf, *psf_prev; 1971 1972 psf_prev = NULL; 1973 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1974 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1975 break; 1976 psf_prev = psf; 1977 } 1978 if (!psf) { 1979 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1980 if (!psf) 1981 return -ENOBUFS; 1982 1983 psf->sf_addr = *psfsrc; 1984 if (psf_prev) { 1985 psf_prev->sf_next = psf; 1986 } else 1987 pmc->mca_sources = psf; 1988 } 1989 psf->sf_count[sfmode]++; 1990 return 0; 1991 } 1992 1993 static void sf_markstate(struct ifmcaddr6 *pmc) 1994 { 1995 struct ip6_sf_list *psf; 1996 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1997 1998 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1999 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2000 psf->sf_oldin = mca_xcount == 2001 psf->sf_count[MCAST_EXCLUDE] && 2002 !psf->sf_count[MCAST_INCLUDE]; 2003 } else 2004 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2005 } 2006 2007 static int sf_setstate(struct ifmcaddr6 *pmc) 2008 { 2009 struct ip6_sf_list *psf, *dpsf; 2010 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2011 int qrv = pmc->idev->mc_qrv; 2012 int new_in, rv; 2013 2014 rv = 0; 2015 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2016 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2017 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2018 !psf->sf_count[MCAST_INCLUDE]; 2019 } else 2020 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2021 if (new_in) { 2022 if (!psf->sf_oldin) { 2023 struct ip6_sf_list *prev = NULL; 2024 2025 for (dpsf=pmc->mca_tomb; dpsf; 2026 dpsf=dpsf->sf_next) { 2027 if (ipv6_addr_equal(&dpsf->sf_addr, 2028 &psf->sf_addr)) 2029 break; 2030 prev = dpsf; 2031 } 2032 if (dpsf) { 2033 if (prev) 2034 prev->sf_next = dpsf->sf_next; 2035 else 2036 pmc->mca_tomb = dpsf->sf_next; 2037 kfree(dpsf); 2038 } 2039 psf->sf_crcount = qrv; 2040 rv++; 2041 } 2042 } else if (psf->sf_oldin) { 2043 psf->sf_crcount = 0; 2044 /* 2045 * add or update "delete" records if an active filter 2046 * is now inactive 2047 */ 2048 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2049 if (ipv6_addr_equal(&dpsf->sf_addr, 2050 &psf->sf_addr)) 2051 break; 2052 if (!dpsf) { 2053 dpsf = (struct ip6_sf_list *) 2054 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2055 if (!dpsf) 2056 continue; 2057 *dpsf = *psf; 2058 /* pmc->mca_lock held by callers */ 2059 dpsf->sf_next = pmc->mca_tomb; 2060 pmc->mca_tomb = dpsf; 2061 } 2062 dpsf->sf_crcount = qrv; 2063 rv++; 2064 } 2065 } 2066 return rv; 2067 } 2068 2069 /* 2070 * Add multicast source filter list to the interface list 2071 */ 2072 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2073 int sfmode, int sfcount, struct in6_addr *psfsrc, 2074 int delta) 2075 { 2076 struct ifmcaddr6 *pmc; 2077 int isexclude; 2078 int i, err; 2079 2080 if (!idev) 2081 return -ENODEV; 2082 read_lock_bh(&idev->lock); 2083 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2084 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2085 break; 2086 } 2087 if (!pmc) { 2088 /* MCA not found?? bug */ 2089 read_unlock_bh(&idev->lock); 2090 return -ESRCH; 2091 } 2092 spin_lock_bh(&pmc->mca_lock); 2093 2094 sf_markstate(pmc); 2095 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2096 if (!delta) 2097 pmc->mca_sfcount[sfmode]++; 2098 err = 0; 2099 for (i=0; i<sfcount; i++) { 2100 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2101 if (err) 2102 break; 2103 } 2104 if (err) { 2105 int j; 2106 2107 if (!delta) 2108 pmc->mca_sfcount[sfmode]--; 2109 for (j=0; j<i; j++) 2110 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2111 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2112 struct ip6_sf_list *psf; 2113 2114 /* filter mode change */ 2115 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2116 pmc->mca_sfmode = MCAST_EXCLUDE; 2117 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2118 pmc->mca_sfmode = MCAST_INCLUDE; 2119 /* else no filters; keep old mode for reports */ 2120 2121 pmc->mca_crcount = idev->mc_qrv; 2122 idev->mc_ifc_count = pmc->mca_crcount; 2123 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2124 psf->sf_crcount = 0; 2125 mld_ifc_event(idev); 2126 } else if (sf_setstate(pmc)) 2127 mld_ifc_event(idev); 2128 spin_unlock_bh(&pmc->mca_lock); 2129 read_unlock_bh(&idev->lock); 2130 return err; 2131 } 2132 2133 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2134 { 2135 struct ip6_sf_list *psf, *nextpsf; 2136 2137 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2138 nextpsf = psf->sf_next; 2139 kfree(psf); 2140 } 2141 pmc->mca_tomb = NULL; 2142 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2143 nextpsf = psf->sf_next; 2144 kfree(psf); 2145 } 2146 pmc->mca_sources = NULL; 2147 pmc->mca_sfmode = MCAST_EXCLUDE; 2148 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2149 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2150 } 2151 2152 2153 static void igmp6_join_group(struct ifmcaddr6 *ma) 2154 { 2155 unsigned long delay; 2156 2157 if (ma->mca_flags & MAF_NOREPORT) 2158 return; 2159 2160 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2161 2162 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2163 2164 spin_lock_bh(&ma->mca_lock); 2165 if (del_timer(&ma->mca_timer)) { 2166 atomic_dec(&ma->mca_refcnt); 2167 delay = ma->mca_timer.expires - jiffies; 2168 } 2169 2170 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2171 atomic_inc(&ma->mca_refcnt); 2172 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2173 spin_unlock_bh(&ma->mca_lock); 2174 } 2175 2176 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2177 struct inet6_dev *idev) 2178 { 2179 int err; 2180 2181 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2182 * so no other readers or writers of iml or its sflist 2183 */ 2184 if (!iml->sflist) { 2185 /* any-source empty exclude case */ 2186 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2187 } 2188 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2189 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2190 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2191 iml->sflist = NULL; 2192 return err; 2193 } 2194 2195 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2196 { 2197 if (MLD_V1_SEEN(ma->idev)) { 2198 if (ma->mca_flags & MAF_LAST_REPORTER) 2199 igmp6_send(&ma->mca_addr, ma->idev->dev, 2200 ICMPV6_MGM_REDUCTION); 2201 } else { 2202 mld_add_delrec(ma->idev, ma); 2203 mld_ifc_event(ma->idev); 2204 } 2205 } 2206 2207 static void mld_gq_timer_expire(unsigned long data) 2208 { 2209 struct inet6_dev *idev = (struct inet6_dev *)data; 2210 2211 idev->mc_gq_running = 0; 2212 mld_send_report(idev, NULL); 2213 __in6_dev_put(idev); 2214 } 2215 2216 static void mld_ifc_timer_expire(unsigned long data) 2217 { 2218 struct inet6_dev *idev = (struct inet6_dev *)data; 2219 2220 mld_send_cr(idev); 2221 if (idev->mc_ifc_count) { 2222 idev->mc_ifc_count--; 2223 if (idev->mc_ifc_count) 2224 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2225 } 2226 __in6_dev_put(idev); 2227 } 2228 2229 static void mld_ifc_event(struct inet6_dev *idev) 2230 { 2231 if (MLD_V1_SEEN(idev)) 2232 return; 2233 idev->mc_ifc_count = idev->mc_qrv; 2234 mld_ifc_start_timer(idev, 1); 2235 } 2236 2237 2238 static void igmp6_timer_handler(unsigned long data) 2239 { 2240 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2241 2242 if (MLD_V1_SEEN(ma->idev)) 2243 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2244 else 2245 mld_send_report(ma->idev, ma); 2246 2247 spin_lock(&ma->mca_lock); 2248 ma->mca_flags |= MAF_LAST_REPORTER; 2249 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2250 spin_unlock(&ma->mca_lock); 2251 ma_put(ma); 2252 } 2253 2254 /* Device changing type */ 2255 2256 void ipv6_mc_unmap(struct inet6_dev *idev) 2257 { 2258 struct ifmcaddr6 *i; 2259 2260 /* Install multicast list, except for all-nodes (already installed) */ 2261 2262 read_lock_bh(&idev->lock); 2263 for (i = idev->mc_list; i; i = i->next) 2264 igmp6_group_dropped(i); 2265 read_unlock_bh(&idev->lock); 2266 } 2267 2268 void ipv6_mc_remap(struct inet6_dev *idev) 2269 { 2270 ipv6_mc_up(idev); 2271 } 2272 2273 /* Device going down */ 2274 2275 void ipv6_mc_down(struct inet6_dev *idev) 2276 { 2277 struct ifmcaddr6 *i; 2278 2279 /* Withdraw multicast list */ 2280 2281 read_lock_bh(&idev->lock); 2282 idev->mc_ifc_count = 0; 2283 if (del_timer(&idev->mc_ifc_timer)) 2284 __in6_dev_put(idev); 2285 idev->mc_gq_running = 0; 2286 if (del_timer(&idev->mc_gq_timer)) 2287 __in6_dev_put(idev); 2288 2289 for (i = idev->mc_list; i; i=i->next) 2290 igmp6_group_dropped(i); 2291 read_unlock_bh(&idev->lock); 2292 2293 mld_clear_delrec(idev); 2294 } 2295 2296 2297 /* Device going up */ 2298 2299 void ipv6_mc_up(struct inet6_dev *idev) 2300 { 2301 struct ifmcaddr6 *i; 2302 2303 /* Install multicast list, except for all-nodes (already installed) */ 2304 2305 read_lock_bh(&idev->lock); 2306 for (i = idev->mc_list; i; i=i->next) 2307 igmp6_group_added(i); 2308 read_unlock_bh(&idev->lock); 2309 } 2310 2311 /* IPv6 device initialization. */ 2312 2313 void ipv6_mc_init_dev(struct inet6_dev *idev) 2314 { 2315 write_lock_bh(&idev->lock); 2316 spin_lock_init(&idev->mc_lock); 2317 idev->mc_gq_running = 0; 2318 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2319 (unsigned long)idev); 2320 idev->mc_tomb = NULL; 2321 idev->mc_ifc_count = 0; 2322 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2323 (unsigned long)idev); 2324 idev->mc_qrv = MLD_QRV_DEFAULT; 2325 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2326 idev->mc_v1_seen = 0; 2327 write_unlock_bh(&idev->lock); 2328 } 2329 2330 /* 2331 * Device is about to be destroyed: clean up. 2332 */ 2333 2334 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2335 { 2336 struct ifmcaddr6 *i; 2337 2338 /* Deactivate timers */ 2339 ipv6_mc_down(idev); 2340 2341 /* Delete all-nodes address. */ 2342 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2343 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2344 * fail. 2345 */ 2346 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2347 2348 if (idev->cnf.forwarding) 2349 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2350 2351 write_lock_bh(&idev->lock); 2352 while ((i = idev->mc_list) != NULL) { 2353 idev->mc_list = i->next; 2354 write_unlock_bh(&idev->lock); 2355 2356 igmp6_group_dropped(i); 2357 ma_put(i); 2358 2359 write_lock_bh(&idev->lock); 2360 } 2361 write_unlock_bh(&idev->lock); 2362 } 2363 2364 #ifdef CONFIG_PROC_FS 2365 struct igmp6_mc_iter_state { 2366 struct seq_net_private p; 2367 struct net_device *dev; 2368 struct inet6_dev *idev; 2369 }; 2370 2371 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2372 2373 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2374 { 2375 struct ifmcaddr6 *im = NULL; 2376 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2377 struct net *net = seq_file_net(seq); 2378 2379 state->idev = NULL; 2380 for_each_netdev_rcu(net, state->dev) { 2381 struct inet6_dev *idev; 2382 idev = __in6_dev_get(state->dev); 2383 if (!idev) 2384 continue; 2385 read_lock_bh(&idev->lock); 2386 im = idev->mc_list; 2387 if (im) { 2388 state->idev = idev; 2389 break; 2390 } 2391 read_unlock_bh(&idev->lock); 2392 } 2393 return im; 2394 } 2395 2396 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2397 { 2398 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2399 2400 im = im->next; 2401 while (!im) { 2402 if (likely(state->idev != NULL)) 2403 read_unlock_bh(&state->idev->lock); 2404 2405 state->dev = next_net_device_rcu(state->dev); 2406 if (!state->dev) { 2407 state->idev = NULL; 2408 break; 2409 } 2410 state->idev = __in6_dev_get(state->dev); 2411 if (!state->idev) 2412 continue; 2413 read_lock_bh(&state->idev->lock); 2414 im = state->idev->mc_list; 2415 } 2416 return im; 2417 } 2418 2419 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2420 { 2421 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2422 if (im) 2423 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2424 --pos; 2425 return pos ? NULL : im; 2426 } 2427 2428 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2429 __acquires(RCU) 2430 { 2431 rcu_read_lock(); 2432 return igmp6_mc_get_idx(seq, *pos); 2433 } 2434 2435 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2436 { 2437 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); 2438 2439 ++*pos; 2440 return im; 2441 } 2442 2443 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2444 __releases(RCU) 2445 { 2446 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2447 2448 if (likely(state->idev != NULL)) { 2449 read_unlock_bh(&state->idev->lock); 2450 state->idev = NULL; 2451 } 2452 state->dev = NULL; 2453 rcu_read_unlock(); 2454 } 2455 2456 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2457 { 2458 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2459 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2460 2461 seq_printf(seq, 2462 "%-4d %-15s %pi6 %5d %08X %ld\n", 2463 state->dev->ifindex, state->dev->name, 2464 &im->mca_addr, 2465 im->mca_users, im->mca_flags, 2466 (im->mca_flags&MAF_TIMER_RUNNING) ? 2467 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2468 return 0; 2469 } 2470 2471 static const struct seq_operations igmp6_mc_seq_ops = { 2472 .start = igmp6_mc_seq_start, 2473 .next = igmp6_mc_seq_next, 2474 .stop = igmp6_mc_seq_stop, 2475 .show = igmp6_mc_seq_show, 2476 }; 2477 2478 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2479 { 2480 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2481 sizeof(struct igmp6_mc_iter_state)); 2482 } 2483 2484 static const struct file_operations igmp6_mc_seq_fops = { 2485 .owner = THIS_MODULE, 2486 .open = igmp6_mc_seq_open, 2487 .read = seq_read, 2488 .llseek = seq_lseek, 2489 .release = seq_release_net, 2490 }; 2491 2492 struct igmp6_mcf_iter_state { 2493 struct seq_net_private p; 2494 struct net_device *dev; 2495 struct inet6_dev *idev; 2496 struct ifmcaddr6 *im; 2497 }; 2498 2499 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2500 2501 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2502 { 2503 struct ip6_sf_list *psf = NULL; 2504 struct ifmcaddr6 *im = NULL; 2505 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2506 struct net *net = seq_file_net(seq); 2507 2508 state->idev = NULL; 2509 state->im = NULL; 2510 for_each_netdev_rcu(net, state->dev) { 2511 struct inet6_dev *idev; 2512 idev = __in6_dev_get(state->dev); 2513 if (unlikely(idev == NULL)) 2514 continue; 2515 read_lock_bh(&idev->lock); 2516 im = idev->mc_list; 2517 if (likely(im != NULL)) { 2518 spin_lock_bh(&im->mca_lock); 2519 psf = im->mca_sources; 2520 if (likely(psf != NULL)) { 2521 state->im = im; 2522 state->idev = idev; 2523 break; 2524 } 2525 spin_unlock_bh(&im->mca_lock); 2526 } 2527 read_unlock_bh(&idev->lock); 2528 } 2529 return psf; 2530 } 2531 2532 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2533 { 2534 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2535 2536 psf = psf->sf_next; 2537 while (!psf) { 2538 spin_unlock_bh(&state->im->mca_lock); 2539 state->im = state->im->next; 2540 while (!state->im) { 2541 if (likely(state->idev != NULL)) 2542 read_unlock_bh(&state->idev->lock); 2543 2544 state->dev = next_net_device_rcu(state->dev); 2545 if (!state->dev) { 2546 state->idev = NULL; 2547 goto out; 2548 } 2549 state->idev = __in6_dev_get(state->dev); 2550 if (!state->idev) 2551 continue; 2552 read_lock_bh(&state->idev->lock); 2553 state->im = state->idev->mc_list; 2554 } 2555 if (!state->im) 2556 break; 2557 spin_lock_bh(&state->im->mca_lock); 2558 psf = state->im->mca_sources; 2559 } 2560 out: 2561 return psf; 2562 } 2563 2564 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2565 { 2566 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2567 if (psf) 2568 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2569 --pos; 2570 return pos ? NULL : psf; 2571 } 2572 2573 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2574 __acquires(RCU) 2575 { 2576 rcu_read_lock(); 2577 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2578 } 2579 2580 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2581 { 2582 struct ip6_sf_list *psf; 2583 if (v == SEQ_START_TOKEN) 2584 psf = igmp6_mcf_get_first(seq); 2585 else 2586 psf = igmp6_mcf_get_next(seq, v); 2587 ++*pos; 2588 return psf; 2589 } 2590 2591 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2592 __releases(RCU) 2593 { 2594 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2595 if (likely(state->im != NULL)) { 2596 spin_unlock_bh(&state->im->mca_lock); 2597 state->im = NULL; 2598 } 2599 if (likely(state->idev != NULL)) { 2600 read_unlock_bh(&state->idev->lock); 2601 state->idev = NULL; 2602 } 2603 state->dev = NULL; 2604 rcu_read_unlock(); 2605 } 2606 2607 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2608 { 2609 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2610 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2611 2612 if (v == SEQ_START_TOKEN) { 2613 seq_printf(seq, 2614 "%3s %6s " 2615 "%32s %32s %6s %6s\n", "Idx", 2616 "Device", "Multicast Address", 2617 "Source Address", "INC", "EXC"); 2618 } else { 2619 seq_printf(seq, 2620 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", 2621 state->dev->ifindex, state->dev->name, 2622 &state->im->mca_addr, 2623 &psf->sf_addr, 2624 psf->sf_count[MCAST_INCLUDE], 2625 psf->sf_count[MCAST_EXCLUDE]); 2626 } 2627 return 0; 2628 } 2629 2630 static const struct seq_operations igmp6_mcf_seq_ops = { 2631 .start = igmp6_mcf_seq_start, 2632 .next = igmp6_mcf_seq_next, 2633 .stop = igmp6_mcf_seq_stop, 2634 .show = igmp6_mcf_seq_show, 2635 }; 2636 2637 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2638 { 2639 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2640 sizeof(struct igmp6_mcf_iter_state)); 2641 } 2642 2643 static const struct file_operations igmp6_mcf_seq_fops = { 2644 .owner = THIS_MODULE, 2645 .open = igmp6_mcf_seq_open, 2646 .read = seq_read, 2647 .llseek = seq_lseek, 2648 .release = seq_release_net, 2649 }; 2650 2651 static int __net_init igmp6_proc_init(struct net *net) 2652 { 2653 int err; 2654 2655 err = -ENOMEM; 2656 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2657 goto out; 2658 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2659 &igmp6_mcf_seq_fops)) 2660 goto out_proc_net_igmp6; 2661 2662 err = 0; 2663 out: 2664 return err; 2665 2666 out_proc_net_igmp6: 2667 proc_net_remove(net, "igmp6"); 2668 goto out; 2669 } 2670 2671 static void __net_exit igmp6_proc_exit(struct net *net) 2672 { 2673 proc_net_remove(net, "mcfilter6"); 2674 proc_net_remove(net, "igmp6"); 2675 } 2676 #else 2677 static inline int igmp6_proc_init(struct net *net) 2678 { 2679 return 0; 2680 } 2681 static inline void igmp6_proc_exit(struct net *net) 2682 { 2683 } 2684 #endif 2685 2686 static int __net_init igmp6_net_init(struct net *net) 2687 { 2688 int err; 2689 2690 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2691 SOCK_RAW, IPPROTO_ICMPV6, net); 2692 if (err < 0) { 2693 printk(KERN_ERR 2694 "Failed to initialize the IGMP6 control socket (err %d).\n", 2695 err); 2696 goto out; 2697 } 2698 2699 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2700 2701 err = igmp6_proc_init(net); 2702 if (err) 2703 goto out_sock_create; 2704 out: 2705 return err; 2706 2707 out_sock_create: 2708 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2709 goto out; 2710 } 2711 2712 static void __net_exit igmp6_net_exit(struct net *net) 2713 { 2714 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2715 igmp6_proc_exit(net); 2716 } 2717 2718 static struct pernet_operations igmp6_net_ops = { 2719 .init = igmp6_net_init, 2720 .exit = igmp6_net_exit, 2721 }; 2722 2723 int __init igmp6_init(void) 2724 { 2725 return register_pernet_subsys(&igmp6_net_ops); 2726 } 2727 2728 void igmp6_cleanup(void) 2729 { 2730 unregister_pernet_subsys(&igmp6_net_ops); 2731 } 2732