1 /* 2 * Multicast support for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $ 9 * 10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 18 /* Changes: 19 * 20 * yoshfuji : fix format of router-alert option 21 * YOSHIFUJI Hideaki @USAGI: 22 * Fixed source address for MLD message based on 23 * <draft-ietf-magma-mld-source-05.txt>. 24 * YOSHIFUJI Hideaki @USAGI: 25 * - Ignore Queries for invalid addresses. 26 * - MLD for link-local addresses. 27 * David L Stevens <dlstevens@us.ibm.com>: 28 * - MLDv2 support 29 */ 30 31 #include <linux/module.h> 32 #include <linux/errno.h> 33 #include <linux/types.h> 34 #include <linux/string.h> 35 #include <linux/socket.h> 36 #include <linux/sockios.h> 37 #include <linux/jiffies.h> 38 #include <linux/times.h> 39 #include <linux/net.h> 40 #include <linux/in.h> 41 #include <linux/in6.h> 42 #include <linux/netdevice.h> 43 #include <linux/if_arp.h> 44 #include <linux/route.h> 45 #include <linux/init.h> 46 #include <linux/proc_fs.h> 47 #include <linux/seq_file.h> 48 49 #include <linux/netfilter.h> 50 #include <linux/netfilter_ipv6.h> 51 52 #include <net/net_namespace.h> 53 #include <net/sock.h> 54 #include <net/snmp.h> 55 56 #include <net/ipv6.h> 57 #include <net/protocol.h> 58 #include <net/if_inet6.h> 59 #include <net/ndisc.h> 60 #include <net/addrconf.h> 61 #include <net/ip6_route.h> 62 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 struct socket *igmp6_socket; 130 131 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr); 132 133 static void igmp6_join_group(struct ifmcaddr6 *ma); 134 static void igmp6_leave_group(struct ifmcaddr6 *ma); 135 static void igmp6_timer_handler(unsigned long data); 136 137 static void mld_gq_timer_expire(unsigned long data); 138 static void mld_ifc_timer_expire(unsigned long data); 139 static void mld_ifc_event(struct inet6_dev *idev); 140 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 141 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 142 static void mld_clear_delrec(struct inet6_dev *idev); 143 static int sf_setstate(struct ifmcaddr6 *pmc); 144 static void sf_markstate(struct ifmcaddr6 *pmc); 145 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 146 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 147 int sfmode, int sfcount, struct in6_addr *psfsrc, 148 int delta); 149 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 150 int sfmode, int sfcount, struct in6_addr *psfsrc, 151 int delta); 152 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 153 struct inet6_dev *idev); 154 155 156 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 157 #define MLD_QRV_DEFAULT 2 158 159 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \ 160 (idev)->cnf.force_mld_version == 1 || \ 161 ((idev)->mc_v1_seen && \ 162 time_before(jiffies, (idev)->mc_v1_seen))) 163 164 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 165 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 166 ((value) < (thresh) ? (value) : \ 167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \ 168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 169 170 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) 171 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) 172 173 #define IPV6_MLD_MAX_MSF 64 174 175 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 176 177 /* 178 * socket join on multicast group 179 */ 180 181 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr) 182 { 183 struct net_device *dev = NULL; 184 struct ipv6_mc_socklist *mc_lst; 185 struct ipv6_pinfo *np = inet6_sk(sk); 186 int err; 187 188 if (!ipv6_addr_is_multicast(addr)) 189 return -EINVAL; 190 191 read_lock_bh(&ipv6_sk_mc_lock); 192 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 193 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 194 ipv6_addr_equal(&mc_lst->addr, addr)) { 195 read_unlock_bh(&ipv6_sk_mc_lock); 196 return -EADDRINUSE; 197 } 198 } 199 read_unlock_bh(&ipv6_sk_mc_lock); 200 201 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 202 203 if (mc_lst == NULL) 204 return -ENOMEM; 205 206 mc_lst->next = NULL; 207 ipv6_addr_copy(&mc_lst->addr, addr); 208 209 if (ifindex == 0) { 210 struct rt6_info *rt; 211 rt = rt6_lookup(addr, NULL, 0, 0); 212 if (rt) { 213 dev = rt->rt6i_dev; 214 dev_hold(dev); 215 dst_release(&rt->u.dst); 216 } 217 } else 218 dev = dev_get_by_index(&init_net, ifindex); 219 220 if (dev == NULL) { 221 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 222 return -ENODEV; 223 } 224 225 mc_lst->ifindex = dev->ifindex; 226 mc_lst->sfmode = MCAST_EXCLUDE; 227 rwlock_init(&mc_lst->sflock); 228 mc_lst->sflist = NULL; 229 230 /* 231 * now add/increase the group membership on the device 232 */ 233 234 err = ipv6_dev_mc_inc(dev, addr); 235 236 if (err) { 237 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 238 dev_put(dev); 239 return err; 240 } 241 242 write_lock_bh(&ipv6_sk_mc_lock); 243 mc_lst->next = np->ipv6_mc_list; 244 np->ipv6_mc_list = mc_lst; 245 write_unlock_bh(&ipv6_sk_mc_lock); 246 247 dev_put(dev); 248 249 return 0; 250 } 251 252 /* 253 * socket leave on multicast group 254 */ 255 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr) 256 { 257 struct ipv6_pinfo *np = inet6_sk(sk); 258 struct ipv6_mc_socklist *mc_lst, **lnk; 259 260 write_lock_bh(&ipv6_sk_mc_lock); 261 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { 262 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 263 ipv6_addr_equal(&mc_lst->addr, addr)) { 264 struct net_device *dev; 265 266 *lnk = mc_lst->next; 267 write_unlock_bh(&ipv6_sk_mc_lock); 268 269 if ((dev = dev_get_by_index(&init_net, mc_lst->ifindex)) != NULL) { 270 struct inet6_dev *idev = in6_dev_get(dev); 271 272 (void) ip6_mc_leave_src(sk, mc_lst, idev); 273 if (idev) { 274 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 275 in6_dev_put(idev); 276 } 277 dev_put(dev); 278 } else 279 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 280 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 281 return 0; 282 } 283 } 284 write_unlock_bh(&ipv6_sk_mc_lock); 285 286 return -EADDRNOTAVAIL; 287 } 288 289 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, 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(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(&init_net, ifindex); 305 306 if (!dev) 307 return NULL; 308 idev = in6_dev_get(dev); 309 if (!idev) { 310 dev_put(dev); 311 return NULL; 312 } 313 read_lock_bh(&idev->lock); 314 if (idev->dead) { 315 read_unlock_bh(&idev->lock); 316 in6_dev_put(idev); 317 dev_put(dev); 318 return NULL; 319 } 320 return idev; 321 } 322 323 void ipv6_sock_mc_close(struct sock *sk) 324 { 325 struct ipv6_pinfo *np = inet6_sk(sk); 326 struct ipv6_mc_socklist *mc_lst; 327 328 write_lock_bh(&ipv6_sk_mc_lock); 329 while ((mc_lst = np->ipv6_mc_list) != NULL) { 330 struct net_device *dev; 331 332 np->ipv6_mc_list = mc_lst->next; 333 write_unlock_bh(&ipv6_sk_mc_lock); 334 335 dev = dev_get_by_index(&init_net, mc_lst->ifindex); 336 if (dev) { 337 struct inet6_dev *idev = in6_dev_get(dev); 338 339 (void) ip6_mc_leave_src(sk, mc_lst, idev); 340 if (idev) { 341 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 342 in6_dev_put(idev); 343 } 344 dev_put(dev); 345 } else 346 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 347 348 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 349 350 write_lock_bh(&ipv6_sk_mc_lock); 351 } 352 write_unlock_bh(&ipv6_sk_mc_lock); 353 } 354 355 int ip6_mc_source(int add, int omode, struct sock *sk, 356 struct group_source_req *pgsr) 357 { 358 struct in6_addr *source, *group; 359 struct ipv6_mc_socklist *pmc; 360 struct net_device *dev; 361 struct inet6_dev *idev; 362 struct ipv6_pinfo *inet6 = inet6_sk(sk); 363 struct ip6_sf_socklist *psl; 364 int i, j, rv; 365 int leavegroup = 0; 366 int pmclocked = 0; 367 int err; 368 369 if (pgsr->gsr_group.ss_family != AF_INET6 || 370 pgsr->gsr_source.ss_family != AF_INET6) 371 return -EINVAL; 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(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 int leavegroup = 0; 504 int i, err; 505 506 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 507 508 if (!ipv6_addr_is_multicast(group)) 509 return -EINVAL; 510 if (gsf->gf_fmode != MCAST_INCLUDE && 511 gsf->gf_fmode != MCAST_EXCLUDE) 512 return -EINVAL; 513 514 idev = ip6_mc_find_dev(group, gsf->gf_interface); 515 516 if (!idev) 517 return -ENODEV; 518 dev = idev->dev; 519 520 err = 0; 521 read_lock_bh(&ipv6_sk_mc_lock); 522 523 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 524 leavegroup = 1; 525 goto done; 526 } 527 528 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 529 if (pmc->ifindex != gsf->gf_interface) 530 continue; 531 if (ipv6_addr_equal(&pmc->addr, group)) 532 break; 533 } 534 if (!pmc) { /* must have a prior join */ 535 err = -EINVAL; 536 goto done; 537 } 538 if (gsf->gf_numsrc) { 539 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 540 GFP_ATOMIC); 541 if (!newpsl) { 542 err = -ENOBUFS; 543 goto done; 544 } 545 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 546 for (i=0; i<newpsl->sl_count; ++i) { 547 struct sockaddr_in6 *psin6; 548 549 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 550 newpsl->sl_addr[i] = psin6->sin6_addr; 551 } 552 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 553 newpsl->sl_count, newpsl->sl_addr, 0); 554 if (err) { 555 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 556 goto done; 557 } 558 } else { 559 newpsl = NULL; 560 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 561 } 562 563 write_lock_bh(&pmc->sflock); 564 psl = pmc->sflist; 565 if (psl) { 566 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 567 psl->sl_count, psl->sl_addr, 0); 568 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 569 } else 570 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 571 pmc->sflist = newpsl; 572 pmc->sfmode = gsf->gf_fmode; 573 write_unlock_bh(&pmc->sflock); 574 err = 0; 575 done: 576 read_unlock_bh(&ipv6_sk_mc_lock); 577 read_unlock_bh(&idev->lock); 578 in6_dev_put(idev); 579 dev_put(dev); 580 if (leavegroup) 581 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 582 return err; 583 } 584 585 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 586 struct group_filter __user *optval, int __user *optlen) 587 { 588 int err, i, count, copycount; 589 struct in6_addr *group; 590 struct ipv6_mc_socklist *pmc; 591 struct inet6_dev *idev; 592 struct net_device *dev; 593 struct ipv6_pinfo *inet6 = inet6_sk(sk); 594 struct ip6_sf_socklist *psl; 595 596 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 597 598 if (!ipv6_addr_is_multicast(group)) 599 return -EINVAL; 600 601 idev = ip6_mc_find_dev(group, gsf->gf_interface); 602 603 if (!idev) 604 return -ENODEV; 605 606 dev = idev->dev; 607 608 err = -EADDRNOTAVAIL; 609 /* 610 * changes to the ipv6_mc_list require the socket lock and 611 * a read lock on ip6_sk_mc_lock. We have the socket lock, 612 * so reading the list is safe. 613 */ 614 615 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 616 if (pmc->ifindex != gsf->gf_interface) 617 continue; 618 if (ipv6_addr_equal(group, &pmc->addr)) 619 break; 620 } 621 if (!pmc) /* must have a prior join */ 622 goto done; 623 gsf->gf_fmode = pmc->sfmode; 624 psl = pmc->sflist; 625 count = psl ? psl->sl_count : 0; 626 read_unlock_bh(&idev->lock); 627 in6_dev_put(idev); 628 dev_put(dev); 629 630 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 631 gsf->gf_numsrc = count; 632 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 633 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 634 return -EFAULT; 635 } 636 /* changes to psl require the socket lock, a read lock on 637 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 638 * have the socket lock, so reading here is safe. 639 */ 640 for (i=0; i<copycount; i++) { 641 struct sockaddr_in6 *psin6; 642 struct sockaddr_storage ss; 643 644 psin6 = (struct sockaddr_in6 *)&ss; 645 memset(&ss, 0, sizeof(ss)); 646 psin6->sin6_family = AF_INET6; 647 psin6->sin6_addr = psl->sl_addr[i]; 648 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 649 return -EFAULT; 650 } 651 return 0; 652 done: 653 read_unlock_bh(&idev->lock); 654 in6_dev_put(idev); 655 dev_put(dev); 656 return err; 657 } 658 659 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr, 660 struct in6_addr *src_addr) 661 { 662 struct ipv6_pinfo *np = inet6_sk(sk); 663 struct ipv6_mc_socklist *mc; 664 struct ip6_sf_socklist *psl; 665 int rv = 1; 666 667 read_lock(&ipv6_sk_mc_lock); 668 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 669 if (ipv6_addr_equal(&mc->addr, mc_addr)) 670 break; 671 } 672 if (!mc) { 673 read_unlock(&ipv6_sk_mc_lock); 674 return 1; 675 } 676 read_lock(&mc->sflock); 677 psl = mc->sflist; 678 if (!psl) { 679 rv = mc->sfmode == MCAST_EXCLUDE; 680 } else { 681 int i; 682 683 for (i=0; i<psl->sl_count; i++) { 684 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 685 break; 686 } 687 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 688 rv = 0; 689 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 690 rv = 0; 691 } 692 read_unlock(&mc->sflock); 693 read_unlock(&ipv6_sk_mc_lock); 694 695 return rv; 696 } 697 698 static void ma_put(struct ifmcaddr6 *mc) 699 { 700 if (atomic_dec_and_test(&mc->mca_refcnt)) { 701 in6_dev_put(mc->idev); 702 kfree(mc); 703 } 704 } 705 706 static void igmp6_group_added(struct ifmcaddr6 *mc) 707 { 708 struct net_device *dev = mc->idev->dev; 709 char buf[MAX_ADDR_LEN]; 710 711 spin_lock_bh(&mc->mca_lock); 712 if (!(mc->mca_flags&MAF_LOADED)) { 713 mc->mca_flags |= MAF_LOADED; 714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 715 dev_mc_add(dev, buf, dev->addr_len, 0); 716 } 717 spin_unlock_bh(&mc->mca_lock); 718 719 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 720 return; 721 722 if (MLD_V1_SEEN(mc->idev)) { 723 igmp6_join_group(mc); 724 return; 725 } 726 /* else v2 */ 727 728 mc->mca_crcount = mc->idev->mc_qrv; 729 mld_ifc_event(mc->idev); 730 } 731 732 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 733 { 734 struct net_device *dev = mc->idev->dev; 735 char buf[MAX_ADDR_LEN]; 736 737 spin_lock_bh(&mc->mca_lock); 738 if (mc->mca_flags&MAF_LOADED) { 739 mc->mca_flags &= ~MAF_LOADED; 740 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 741 dev_mc_delete(dev, buf, dev->addr_len, 0); 742 } 743 744 if (mc->mca_flags & MAF_NOREPORT) 745 goto done; 746 spin_unlock_bh(&mc->mca_lock); 747 748 if (!mc->idev->dead) 749 igmp6_leave_group(mc); 750 751 spin_lock_bh(&mc->mca_lock); 752 if (del_timer(&mc->mca_timer)) 753 atomic_dec(&mc->mca_refcnt); 754 done: 755 ip6_mc_clear_src(mc); 756 spin_unlock_bh(&mc->mca_lock); 757 } 758 759 /* 760 * deleted ifmcaddr6 manipulation 761 */ 762 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 763 { 764 struct ifmcaddr6 *pmc; 765 766 /* this is an "ifmcaddr6" for convenience; only the fields below 767 * are actually used. In particular, the refcnt and users are not 768 * used for management of the delete list. Using the same structure 769 * for deleted items allows change reports to use common code with 770 * non-deleted or query-response MCA's. 771 */ 772 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 773 if (!pmc) 774 return; 775 776 spin_lock_bh(&im->mca_lock); 777 spin_lock_init(&pmc->mca_lock); 778 pmc->idev = im->idev; 779 in6_dev_hold(idev); 780 pmc->mca_addr = im->mca_addr; 781 pmc->mca_crcount = idev->mc_qrv; 782 pmc->mca_sfmode = im->mca_sfmode; 783 if (pmc->mca_sfmode == MCAST_INCLUDE) { 784 struct ip6_sf_list *psf; 785 786 pmc->mca_tomb = im->mca_tomb; 787 pmc->mca_sources = im->mca_sources; 788 im->mca_tomb = im->mca_sources = NULL; 789 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 790 psf->sf_crcount = pmc->mca_crcount; 791 } 792 spin_unlock_bh(&im->mca_lock); 793 794 write_lock_bh(&idev->mc_lock); 795 pmc->next = idev->mc_tomb; 796 idev->mc_tomb = pmc; 797 write_unlock_bh(&idev->mc_lock); 798 } 799 800 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 801 { 802 struct ifmcaddr6 *pmc, *pmc_prev; 803 struct ip6_sf_list *psf, *psf_next; 804 805 write_lock_bh(&idev->mc_lock); 806 pmc_prev = NULL; 807 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 808 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 809 break; 810 pmc_prev = pmc; 811 } 812 if (pmc) { 813 if (pmc_prev) 814 pmc_prev->next = pmc->next; 815 else 816 idev->mc_tomb = pmc->next; 817 } 818 write_unlock_bh(&idev->mc_lock); 819 if (pmc) { 820 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 821 psf_next = psf->sf_next; 822 kfree(psf); 823 } 824 in6_dev_put(pmc->idev); 825 kfree(pmc); 826 } 827 } 828 829 static void mld_clear_delrec(struct inet6_dev *idev) 830 { 831 struct ifmcaddr6 *pmc, *nextpmc; 832 833 write_lock_bh(&idev->mc_lock); 834 pmc = idev->mc_tomb; 835 idev->mc_tomb = NULL; 836 write_unlock_bh(&idev->mc_lock); 837 838 for (; pmc; pmc = nextpmc) { 839 nextpmc = pmc->next; 840 ip6_mc_clear_src(pmc); 841 in6_dev_put(pmc->idev); 842 kfree(pmc); 843 } 844 845 /* clear dead sources, too */ 846 read_lock_bh(&idev->lock); 847 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 848 struct ip6_sf_list *psf, *psf_next; 849 850 spin_lock_bh(&pmc->mca_lock); 851 psf = pmc->mca_tomb; 852 pmc->mca_tomb = NULL; 853 spin_unlock_bh(&pmc->mca_lock); 854 for (; psf; psf=psf_next) { 855 psf_next = psf->sf_next; 856 kfree(psf); 857 } 858 } 859 read_unlock_bh(&idev->lock); 860 } 861 862 863 /* 864 * device multicast group inc (add if not found) 865 */ 866 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr) 867 { 868 struct ifmcaddr6 *mc; 869 struct inet6_dev *idev; 870 871 idev = in6_dev_get(dev); 872 873 if (idev == NULL) 874 return -EINVAL; 875 876 write_lock_bh(&idev->lock); 877 if (idev->dead) { 878 write_unlock_bh(&idev->lock); 879 in6_dev_put(idev); 880 return -ENODEV; 881 } 882 883 for (mc = idev->mc_list; mc; mc = mc->next) { 884 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 885 mc->mca_users++; 886 write_unlock_bh(&idev->lock); 887 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 888 NULL, 0); 889 in6_dev_put(idev); 890 return 0; 891 } 892 } 893 894 /* 895 * not found: create a new one. 896 */ 897 898 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 899 900 if (mc == NULL) { 901 write_unlock_bh(&idev->lock); 902 in6_dev_put(idev); 903 return -ENOMEM; 904 } 905 906 init_timer(&mc->mca_timer); 907 mc->mca_timer.function = igmp6_timer_handler; 908 mc->mca_timer.data = (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, 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, 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, struct in6_addr *group, 1010 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 sock *sk = igmp6_socket->sk; 1399 struct sk_buff *skb; 1400 struct mld2_report *pmr; 1401 struct in6_addr addr_buf; 1402 int err; 1403 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1404 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1405 IPV6_TLV_PADN, 0 }; 1406 1407 /* we assume size > sizeof(ra) here */ 1408 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1409 1410 if (!skb) 1411 return NULL; 1412 1413 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1414 1415 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1416 /* <draft-ietf-magma-mld-source-05.txt>: 1417 * use unspecified address as the source address 1418 * when a valid link-local address is not available. 1419 */ 1420 memset(&addr_buf, 0, sizeof(addr_buf)); 1421 } 1422 1423 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1424 1425 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1426 1427 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1428 skb_put(skb, sizeof(*pmr)); 1429 pmr = (struct mld2_report *)skb_transport_header(skb); 1430 pmr->type = ICMPV6_MLD2_REPORT; 1431 pmr->resv1 = 0; 1432 pmr->csum = 0; 1433 pmr->resv2 = 0; 1434 pmr->ngrec = 0; 1435 return skb; 1436 } 1437 1438 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1439 { 1440 struct net_device *dev = skb->dev; 1441 unsigned char ha[MAX_ADDR_LEN]; 1442 1443 ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1); 1444 if (dev_hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len) < 0) { 1445 kfree_skb(skb); 1446 return -EINVAL; 1447 } 1448 return dev_queue_xmit(skb); 1449 } 1450 1451 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1452 { 1453 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1454 mld_dev_queue_xmit2); 1455 } 1456 1457 static void mld_sendpack(struct sk_buff *skb) 1458 { 1459 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1460 struct mld2_report *pmr = 1461 (struct mld2_report *)skb_transport_header(skb); 1462 int payload_len, mldlen; 1463 struct inet6_dev *idev = in6_dev_get(skb->dev); 1464 int err; 1465 1466 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); 1467 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1468 mldlen = skb->tail - skb->transport_header; 1469 pip6->payload_len = htons(payload_len); 1470 1471 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1472 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), 1473 mldlen, 0)); 1474 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1475 mld_dev_queue_xmit); 1476 if (!err) { 1477 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT); 1478 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 1479 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS); 1480 } else 1481 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS); 1482 1483 if (likely(idev != NULL)) 1484 in6_dev_put(idev); 1485 } 1486 1487 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1488 { 1489 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1490 } 1491 1492 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1493 int type, struct mld2_grec **ppgr) 1494 { 1495 struct net_device *dev = pmc->idev->dev; 1496 struct mld2_report *pmr; 1497 struct mld2_grec *pgr; 1498 1499 if (!skb) 1500 skb = mld_newpack(dev, dev->mtu); 1501 if (!skb) 1502 return NULL; 1503 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1504 pgr->grec_type = type; 1505 pgr->grec_auxwords = 0; 1506 pgr->grec_nsrcs = 0; 1507 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1508 pmr = (struct mld2_report *)skb_transport_header(skb); 1509 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1510 *ppgr = pgr; 1511 return skb; 1512 } 1513 1514 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1515 skb_tailroom(skb)) : 0) 1516 1517 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1518 int type, int gdeleted, int sdeleted) 1519 { 1520 struct net_device *dev = pmc->idev->dev; 1521 struct mld2_report *pmr; 1522 struct mld2_grec *pgr = NULL; 1523 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1524 int scount, stotal, first, isquery, truncate; 1525 1526 if (pmc->mca_flags & MAF_NOREPORT) 1527 return skb; 1528 1529 isquery = type == MLD2_MODE_IS_INCLUDE || 1530 type == MLD2_MODE_IS_EXCLUDE; 1531 truncate = type == MLD2_MODE_IS_EXCLUDE || 1532 type == MLD2_CHANGE_TO_EXCLUDE; 1533 1534 stotal = scount = 0; 1535 1536 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1537 1538 if (!*psf_list) 1539 goto empty_source; 1540 1541 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1542 1543 /* EX and TO_EX get a fresh packet, if needed */ 1544 if (truncate) { 1545 if (pmr && pmr->ngrec && 1546 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1547 if (skb) 1548 mld_sendpack(skb); 1549 skb = mld_newpack(dev, dev->mtu); 1550 } 1551 } 1552 first = 1; 1553 psf_prev = NULL; 1554 for (psf=*psf_list; psf; psf=psf_next) { 1555 struct in6_addr *psrc; 1556 1557 psf_next = psf->sf_next; 1558 1559 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1560 psf_prev = psf; 1561 continue; 1562 } 1563 1564 /* clear marks on query responses */ 1565 if (isquery) 1566 psf->sf_gsresp = 0; 1567 1568 if (AVAILABLE(skb) < sizeof(*psrc) + 1569 first*sizeof(struct mld2_grec)) { 1570 if (truncate && !first) 1571 break; /* truncate these */ 1572 if (pgr) 1573 pgr->grec_nsrcs = htons(scount); 1574 if (skb) 1575 mld_sendpack(skb); 1576 skb = mld_newpack(dev, dev->mtu); 1577 first = 1; 1578 scount = 0; 1579 } 1580 if (first) { 1581 skb = add_grhead(skb, pmc, type, &pgr); 1582 first = 0; 1583 } 1584 if (!skb) 1585 return NULL; 1586 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1587 *psrc = psf->sf_addr; 1588 scount++; stotal++; 1589 if ((type == MLD2_ALLOW_NEW_SOURCES || 1590 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1591 psf->sf_crcount--; 1592 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1593 if (psf_prev) 1594 psf_prev->sf_next = psf->sf_next; 1595 else 1596 *psf_list = psf->sf_next; 1597 kfree(psf); 1598 continue; 1599 } 1600 } 1601 psf_prev = psf; 1602 } 1603 1604 empty_source: 1605 if (!stotal) { 1606 if (type == MLD2_ALLOW_NEW_SOURCES || 1607 type == MLD2_BLOCK_OLD_SOURCES) 1608 return skb; 1609 if (pmc->mca_crcount || isquery) { 1610 /* make sure we have room for group header */ 1611 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1612 mld_sendpack(skb); 1613 skb = NULL; /* add_grhead will get a new one */ 1614 } 1615 skb = add_grhead(skb, pmc, type, &pgr); 1616 } 1617 } 1618 if (pgr) 1619 pgr->grec_nsrcs = htons(scount); 1620 1621 if (isquery) 1622 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1623 return skb; 1624 } 1625 1626 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1627 { 1628 struct sk_buff *skb = NULL; 1629 int type; 1630 1631 if (!pmc) { 1632 read_lock_bh(&idev->lock); 1633 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1634 if (pmc->mca_flags & MAF_NOREPORT) 1635 continue; 1636 spin_lock_bh(&pmc->mca_lock); 1637 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1638 type = MLD2_MODE_IS_EXCLUDE; 1639 else 1640 type = MLD2_MODE_IS_INCLUDE; 1641 skb = add_grec(skb, pmc, type, 0, 0); 1642 spin_unlock_bh(&pmc->mca_lock); 1643 } 1644 read_unlock_bh(&idev->lock); 1645 } else { 1646 spin_lock_bh(&pmc->mca_lock); 1647 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1648 type = MLD2_MODE_IS_EXCLUDE; 1649 else 1650 type = MLD2_MODE_IS_INCLUDE; 1651 skb = add_grec(skb, pmc, type, 0, 0); 1652 spin_unlock_bh(&pmc->mca_lock); 1653 } 1654 if (skb) 1655 mld_sendpack(skb); 1656 } 1657 1658 /* 1659 * remove zero-count source records from a source filter list 1660 */ 1661 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1662 { 1663 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1664 1665 psf_prev = NULL; 1666 for (psf=*ppsf; psf; psf = psf_next) { 1667 psf_next = psf->sf_next; 1668 if (psf->sf_crcount == 0) { 1669 if (psf_prev) 1670 psf_prev->sf_next = psf->sf_next; 1671 else 1672 *ppsf = psf->sf_next; 1673 kfree(psf); 1674 } else 1675 psf_prev = psf; 1676 } 1677 } 1678 1679 static void mld_send_cr(struct inet6_dev *idev) 1680 { 1681 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1682 struct sk_buff *skb = NULL; 1683 int type, dtype; 1684 1685 read_lock_bh(&idev->lock); 1686 write_lock_bh(&idev->mc_lock); 1687 1688 /* deleted MCA's */ 1689 pmc_prev = NULL; 1690 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1691 pmc_next = pmc->next; 1692 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1693 type = MLD2_BLOCK_OLD_SOURCES; 1694 dtype = MLD2_BLOCK_OLD_SOURCES; 1695 skb = add_grec(skb, pmc, type, 1, 0); 1696 skb = add_grec(skb, pmc, dtype, 1, 1); 1697 } 1698 if (pmc->mca_crcount) { 1699 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1700 type = MLD2_CHANGE_TO_INCLUDE; 1701 skb = add_grec(skb, pmc, type, 1, 0); 1702 } 1703 pmc->mca_crcount--; 1704 if (pmc->mca_crcount == 0) { 1705 mld_clear_zeros(&pmc->mca_tomb); 1706 mld_clear_zeros(&pmc->mca_sources); 1707 } 1708 } 1709 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1710 !pmc->mca_sources) { 1711 if (pmc_prev) 1712 pmc_prev->next = pmc_next; 1713 else 1714 idev->mc_tomb = pmc_next; 1715 in6_dev_put(pmc->idev); 1716 kfree(pmc); 1717 } else 1718 pmc_prev = pmc; 1719 } 1720 write_unlock_bh(&idev->mc_lock); 1721 1722 /* change recs */ 1723 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1724 spin_lock_bh(&pmc->mca_lock); 1725 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1726 type = MLD2_BLOCK_OLD_SOURCES; 1727 dtype = MLD2_ALLOW_NEW_SOURCES; 1728 } else { 1729 type = MLD2_ALLOW_NEW_SOURCES; 1730 dtype = MLD2_BLOCK_OLD_SOURCES; 1731 } 1732 skb = add_grec(skb, pmc, type, 0, 0); 1733 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1734 1735 /* filter mode changes */ 1736 if (pmc->mca_crcount) { 1737 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1738 type = MLD2_CHANGE_TO_EXCLUDE; 1739 else 1740 type = MLD2_CHANGE_TO_INCLUDE; 1741 skb = add_grec(skb, pmc, type, 0, 0); 1742 pmc->mca_crcount--; 1743 } 1744 spin_unlock_bh(&pmc->mca_lock); 1745 } 1746 read_unlock_bh(&idev->lock); 1747 if (!skb) 1748 return; 1749 (void) mld_sendpack(skb); 1750 } 1751 1752 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1753 { 1754 struct sock *sk = igmp6_socket->sk; 1755 struct inet6_dev *idev; 1756 struct sk_buff *skb; 1757 struct icmp6hdr *hdr; 1758 struct in6_addr *snd_addr; 1759 struct in6_addr *addrp; 1760 struct in6_addr addr_buf; 1761 struct in6_addr all_routers; 1762 int err, len, payload_len, full_len; 1763 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1764 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1765 IPV6_TLV_PADN, 0 }; 1766 1767 rcu_read_lock(); 1768 IP6_INC_STATS(__in6_dev_get(dev), 1769 IPSTATS_MIB_OUTREQUESTS); 1770 rcu_read_unlock(); 1771 snd_addr = addr; 1772 if (type == ICMPV6_MGM_REDUCTION) { 1773 snd_addr = &all_routers; 1774 ipv6_addr_all_routers(&all_routers); 1775 } 1776 1777 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1778 payload_len = len + sizeof(ra); 1779 full_len = sizeof(struct ipv6hdr) + payload_len; 1780 1781 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1782 1783 if (skb == NULL) { 1784 rcu_read_lock(); 1785 IP6_INC_STATS(__in6_dev_get(dev), 1786 IPSTATS_MIB_OUTDISCARDS); 1787 rcu_read_unlock(); 1788 return; 1789 } 1790 1791 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1792 1793 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1794 /* <draft-ietf-magma-mld-source-05.txt>: 1795 * use unspecified address as the source address 1796 * when a valid link-local address is not available. 1797 */ 1798 memset(&addr_buf, 0, sizeof(addr_buf)); 1799 } 1800 1801 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1802 1803 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1804 1805 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1806 memset(hdr, 0, sizeof(struct icmp6hdr)); 1807 hdr->icmp6_type = type; 1808 1809 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1810 ipv6_addr_copy(addrp, addr); 1811 1812 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1813 IPPROTO_ICMPV6, 1814 csum_partial((__u8 *) hdr, len, 0)); 1815 1816 idev = in6_dev_get(skb->dev); 1817 1818 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1819 mld_dev_queue_xmit); 1820 if (!err) { 1821 ICMP6MSGOUT_INC_STATS(idev, type); 1822 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1823 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); 1824 } else 1825 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); 1826 1827 if (likely(idev != NULL)) 1828 in6_dev_put(idev); 1829 return; 1830 } 1831 1832 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1833 struct in6_addr *psfsrc) 1834 { 1835 struct ip6_sf_list *psf, *psf_prev; 1836 int rv = 0; 1837 1838 psf_prev = NULL; 1839 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1840 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1841 break; 1842 psf_prev = psf; 1843 } 1844 if (!psf || psf->sf_count[sfmode] == 0) { 1845 /* source filter not found, or count wrong => bug */ 1846 return -ESRCH; 1847 } 1848 psf->sf_count[sfmode]--; 1849 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1850 struct inet6_dev *idev = pmc->idev; 1851 1852 /* no more filters for this source */ 1853 if (psf_prev) 1854 psf_prev->sf_next = psf->sf_next; 1855 else 1856 pmc->mca_sources = psf->sf_next; 1857 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1858 !MLD_V1_SEEN(idev)) { 1859 psf->sf_crcount = idev->mc_qrv; 1860 psf->sf_next = pmc->mca_tomb; 1861 pmc->mca_tomb = psf; 1862 rv = 1; 1863 } else 1864 kfree(psf); 1865 } 1866 return rv; 1867 } 1868 1869 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1870 int sfmode, int sfcount, struct in6_addr *psfsrc, 1871 int delta) 1872 { 1873 struct ifmcaddr6 *pmc; 1874 int changerec = 0; 1875 int i, err; 1876 1877 if (!idev) 1878 return -ENODEV; 1879 read_lock_bh(&idev->lock); 1880 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1881 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1882 break; 1883 } 1884 if (!pmc) { 1885 /* MCA not found?? bug */ 1886 read_unlock_bh(&idev->lock); 1887 return -ESRCH; 1888 } 1889 spin_lock_bh(&pmc->mca_lock); 1890 sf_markstate(pmc); 1891 if (!delta) { 1892 if (!pmc->mca_sfcount[sfmode]) { 1893 spin_unlock_bh(&pmc->mca_lock); 1894 read_unlock_bh(&idev->lock); 1895 return -EINVAL; 1896 } 1897 pmc->mca_sfcount[sfmode]--; 1898 } 1899 err = 0; 1900 for (i=0; i<sfcount; i++) { 1901 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1902 1903 changerec |= rv > 0; 1904 if (!err && rv < 0) 1905 err = rv; 1906 } 1907 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1908 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1909 pmc->mca_sfcount[MCAST_INCLUDE]) { 1910 struct ip6_sf_list *psf; 1911 1912 /* filter mode change */ 1913 pmc->mca_sfmode = MCAST_INCLUDE; 1914 pmc->mca_crcount = idev->mc_qrv; 1915 idev->mc_ifc_count = pmc->mca_crcount; 1916 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1917 psf->sf_crcount = 0; 1918 mld_ifc_event(pmc->idev); 1919 } else if (sf_setstate(pmc) || changerec) 1920 mld_ifc_event(pmc->idev); 1921 spin_unlock_bh(&pmc->mca_lock); 1922 read_unlock_bh(&idev->lock); 1923 return err; 1924 } 1925 1926 /* 1927 * Add multicast single-source filter to the interface list 1928 */ 1929 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1930 struct in6_addr *psfsrc, int delta) 1931 { 1932 struct ip6_sf_list *psf, *psf_prev; 1933 1934 psf_prev = NULL; 1935 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1936 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1937 break; 1938 psf_prev = psf; 1939 } 1940 if (!psf) { 1941 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1942 if (!psf) 1943 return -ENOBUFS; 1944 1945 psf->sf_addr = *psfsrc; 1946 if (psf_prev) { 1947 psf_prev->sf_next = psf; 1948 } else 1949 pmc->mca_sources = psf; 1950 } 1951 psf->sf_count[sfmode]++; 1952 return 0; 1953 } 1954 1955 static void sf_markstate(struct ifmcaddr6 *pmc) 1956 { 1957 struct ip6_sf_list *psf; 1958 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1959 1960 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1961 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1962 psf->sf_oldin = mca_xcount == 1963 psf->sf_count[MCAST_EXCLUDE] && 1964 !psf->sf_count[MCAST_INCLUDE]; 1965 } else 1966 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1967 } 1968 1969 static int sf_setstate(struct ifmcaddr6 *pmc) 1970 { 1971 struct ip6_sf_list *psf, *dpsf; 1972 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1973 int qrv = pmc->idev->mc_qrv; 1974 int new_in, rv; 1975 1976 rv = 0; 1977 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1978 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1979 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1980 !psf->sf_count[MCAST_INCLUDE]; 1981 } else 1982 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1983 if (new_in) { 1984 if (!psf->sf_oldin) { 1985 struct ip6_sf_list *prev = NULL; 1986 1987 for (dpsf=pmc->mca_tomb; dpsf; 1988 dpsf=dpsf->sf_next) { 1989 if (ipv6_addr_equal(&dpsf->sf_addr, 1990 &psf->sf_addr)) 1991 break; 1992 prev = dpsf; 1993 } 1994 if (dpsf) { 1995 if (prev) 1996 prev->sf_next = dpsf->sf_next; 1997 else 1998 pmc->mca_tomb = dpsf->sf_next; 1999 kfree(dpsf); 2000 } 2001 psf->sf_crcount = qrv; 2002 rv++; 2003 } 2004 } else if (psf->sf_oldin) { 2005 psf->sf_crcount = 0; 2006 /* 2007 * add or update "delete" records if an active filter 2008 * is now inactive 2009 */ 2010 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2011 if (ipv6_addr_equal(&dpsf->sf_addr, 2012 &psf->sf_addr)) 2013 break; 2014 if (!dpsf) { 2015 dpsf = (struct ip6_sf_list *) 2016 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2017 if (!dpsf) 2018 continue; 2019 *dpsf = *psf; 2020 /* pmc->mca_lock held by callers */ 2021 dpsf->sf_next = pmc->mca_tomb; 2022 pmc->mca_tomb = dpsf; 2023 } 2024 dpsf->sf_crcount = qrv; 2025 rv++; 2026 } 2027 } 2028 return rv; 2029 } 2030 2031 /* 2032 * Add multicast source filter list to the interface list 2033 */ 2034 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2035 int sfmode, int sfcount, struct in6_addr *psfsrc, 2036 int delta) 2037 { 2038 struct ifmcaddr6 *pmc; 2039 int isexclude; 2040 int i, err; 2041 2042 if (!idev) 2043 return -ENODEV; 2044 read_lock_bh(&idev->lock); 2045 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2046 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2047 break; 2048 } 2049 if (!pmc) { 2050 /* MCA not found?? bug */ 2051 read_unlock_bh(&idev->lock); 2052 return -ESRCH; 2053 } 2054 spin_lock_bh(&pmc->mca_lock); 2055 2056 sf_markstate(pmc); 2057 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2058 if (!delta) 2059 pmc->mca_sfcount[sfmode]++; 2060 err = 0; 2061 for (i=0; i<sfcount; i++) { 2062 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2063 if (err) 2064 break; 2065 } 2066 if (err) { 2067 int j; 2068 2069 if (!delta) 2070 pmc->mca_sfcount[sfmode]--; 2071 for (j=0; j<i; j++) 2072 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2073 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2074 struct inet6_dev *idev = pmc->idev; 2075 struct ip6_sf_list *psf; 2076 2077 /* filter mode change */ 2078 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2079 pmc->mca_sfmode = MCAST_EXCLUDE; 2080 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2081 pmc->mca_sfmode = MCAST_INCLUDE; 2082 /* else no filters; keep old mode for reports */ 2083 2084 pmc->mca_crcount = idev->mc_qrv; 2085 idev->mc_ifc_count = pmc->mca_crcount; 2086 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2087 psf->sf_crcount = 0; 2088 mld_ifc_event(idev); 2089 } else if (sf_setstate(pmc)) 2090 mld_ifc_event(idev); 2091 spin_unlock_bh(&pmc->mca_lock); 2092 read_unlock_bh(&idev->lock); 2093 return err; 2094 } 2095 2096 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2097 { 2098 struct ip6_sf_list *psf, *nextpsf; 2099 2100 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2101 nextpsf = psf->sf_next; 2102 kfree(psf); 2103 } 2104 pmc->mca_tomb = NULL; 2105 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2106 nextpsf = psf->sf_next; 2107 kfree(psf); 2108 } 2109 pmc->mca_sources = NULL; 2110 pmc->mca_sfmode = MCAST_EXCLUDE; 2111 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2112 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2113 } 2114 2115 2116 static void igmp6_join_group(struct ifmcaddr6 *ma) 2117 { 2118 unsigned long delay; 2119 2120 if (ma->mca_flags & MAF_NOREPORT) 2121 return; 2122 2123 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2124 2125 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2126 2127 spin_lock_bh(&ma->mca_lock); 2128 if (del_timer(&ma->mca_timer)) { 2129 atomic_dec(&ma->mca_refcnt); 2130 delay = ma->mca_timer.expires - jiffies; 2131 } 2132 2133 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2134 atomic_inc(&ma->mca_refcnt); 2135 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2136 spin_unlock_bh(&ma->mca_lock); 2137 } 2138 2139 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2140 struct inet6_dev *idev) 2141 { 2142 int err; 2143 2144 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2145 * so no other readers or writers of iml or its sflist 2146 */ 2147 if (!iml->sflist) { 2148 /* any-source empty exclude case */ 2149 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2150 } 2151 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2152 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2153 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2154 iml->sflist = NULL; 2155 return err; 2156 } 2157 2158 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2159 { 2160 if (MLD_V1_SEEN(ma->idev)) { 2161 if (ma->mca_flags & MAF_LAST_REPORTER) 2162 igmp6_send(&ma->mca_addr, ma->idev->dev, 2163 ICMPV6_MGM_REDUCTION); 2164 } else { 2165 mld_add_delrec(ma->idev, ma); 2166 mld_ifc_event(ma->idev); 2167 } 2168 } 2169 2170 static void mld_gq_timer_expire(unsigned long data) 2171 { 2172 struct inet6_dev *idev = (struct inet6_dev *)data; 2173 2174 idev->mc_gq_running = 0; 2175 mld_send_report(idev, NULL); 2176 __in6_dev_put(idev); 2177 } 2178 2179 static void mld_ifc_timer_expire(unsigned long data) 2180 { 2181 struct inet6_dev *idev = (struct inet6_dev *)data; 2182 2183 mld_send_cr(idev); 2184 if (idev->mc_ifc_count) { 2185 idev->mc_ifc_count--; 2186 if (idev->mc_ifc_count) 2187 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2188 } 2189 __in6_dev_put(idev); 2190 } 2191 2192 static void mld_ifc_event(struct inet6_dev *idev) 2193 { 2194 if (MLD_V1_SEEN(idev)) 2195 return; 2196 idev->mc_ifc_count = idev->mc_qrv; 2197 mld_ifc_start_timer(idev, 1); 2198 } 2199 2200 2201 static void igmp6_timer_handler(unsigned long data) 2202 { 2203 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2204 2205 if (MLD_V1_SEEN(ma->idev)) 2206 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2207 else 2208 mld_send_report(ma->idev, ma); 2209 2210 spin_lock(&ma->mca_lock); 2211 ma->mca_flags |= MAF_LAST_REPORTER; 2212 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2213 spin_unlock(&ma->mca_lock); 2214 ma_put(ma); 2215 } 2216 2217 /* Device going down */ 2218 2219 void ipv6_mc_down(struct inet6_dev *idev) 2220 { 2221 struct ifmcaddr6 *i; 2222 2223 /* Withdraw multicast list */ 2224 2225 read_lock_bh(&idev->lock); 2226 idev->mc_ifc_count = 0; 2227 if (del_timer(&idev->mc_ifc_timer)) 2228 __in6_dev_put(idev); 2229 idev->mc_gq_running = 0; 2230 if (del_timer(&idev->mc_gq_timer)) 2231 __in6_dev_put(idev); 2232 2233 for (i = idev->mc_list; i; i=i->next) 2234 igmp6_group_dropped(i); 2235 read_unlock_bh(&idev->lock); 2236 2237 mld_clear_delrec(idev); 2238 } 2239 2240 2241 /* Device going up */ 2242 2243 void ipv6_mc_up(struct inet6_dev *idev) 2244 { 2245 struct ifmcaddr6 *i; 2246 2247 /* Install multicast list, except for all-nodes (already installed) */ 2248 2249 read_lock_bh(&idev->lock); 2250 for (i = idev->mc_list; i; i=i->next) 2251 igmp6_group_added(i); 2252 read_unlock_bh(&idev->lock); 2253 } 2254 2255 /* IPv6 device initialization. */ 2256 2257 void ipv6_mc_init_dev(struct inet6_dev *idev) 2258 { 2259 write_lock_bh(&idev->lock); 2260 rwlock_init(&idev->mc_lock); 2261 idev->mc_gq_running = 0; 2262 init_timer(&idev->mc_gq_timer); 2263 idev->mc_gq_timer.data = (unsigned long) idev; 2264 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2265 idev->mc_tomb = NULL; 2266 idev->mc_ifc_count = 0; 2267 init_timer(&idev->mc_ifc_timer); 2268 idev->mc_ifc_timer.data = (unsigned long) idev; 2269 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2270 idev->mc_qrv = MLD_QRV_DEFAULT; 2271 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2272 idev->mc_v1_seen = 0; 2273 write_unlock_bh(&idev->lock); 2274 } 2275 2276 /* 2277 * Device is about to be destroyed: clean up. 2278 */ 2279 2280 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2281 { 2282 struct ifmcaddr6 *i; 2283 struct in6_addr maddr; 2284 2285 /* Deactivate timers */ 2286 ipv6_mc_down(idev); 2287 2288 /* Delete all-nodes address. */ 2289 ipv6_addr_all_nodes(&maddr); 2290 2291 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2292 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2293 * fail. 2294 */ 2295 __ipv6_dev_mc_dec(idev, &maddr); 2296 2297 if (idev->cnf.forwarding) { 2298 ipv6_addr_all_routers(&maddr); 2299 __ipv6_dev_mc_dec(idev, &maddr); 2300 } 2301 2302 write_lock_bh(&idev->lock); 2303 while ((i = idev->mc_list) != NULL) { 2304 idev->mc_list = i->next; 2305 write_unlock_bh(&idev->lock); 2306 2307 igmp6_group_dropped(i); 2308 ma_put(i); 2309 2310 write_lock_bh(&idev->lock); 2311 } 2312 write_unlock_bh(&idev->lock); 2313 } 2314 2315 #ifdef CONFIG_PROC_FS 2316 struct igmp6_mc_iter_state { 2317 struct net_device *dev; 2318 struct inet6_dev *idev; 2319 }; 2320 2321 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2322 2323 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2324 { 2325 struct ifmcaddr6 *im = NULL; 2326 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2327 2328 state->idev = NULL; 2329 for_each_netdev(&init_net, state->dev) { 2330 struct inet6_dev *idev; 2331 idev = in6_dev_get(state->dev); 2332 if (!idev) 2333 continue; 2334 read_lock_bh(&idev->lock); 2335 im = idev->mc_list; 2336 if (im) { 2337 state->idev = idev; 2338 break; 2339 } 2340 read_unlock_bh(&idev->lock); 2341 in6_dev_put(idev); 2342 } 2343 return im; 2344 } 2345 2346 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2347 { 2348 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2349 2350 im = im->next; 2351 while (!im) { 2352 if (likely(state->idev != NULL)) { 2353 read_unlock_bh(&state->idev->lock); 2354 in6_dev_put(state->idev); 2355 } 2356 state->dev = next_net_device(state->dev); 2357 if (!state->dev) { 2358 state->idev = NULL; 2359 break; 2360 } 2361 state->idev = in6_dev_get(state->dev); 2362 if (!state->idev) 2363 continue; 2364 read_lock_bh(&state->idev->lock); 2365 im = state->idev->mc_list; 2366 } 2367 return im; 2368 } 2369 2370 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2371 { 2372 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2373 if (im) 2374 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2375 --pos; 2376 return pos ? NULL : im; 2377 } 2378 2379 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2380 { 2381 read_lock(&dev_base_lock); 2382 return igmp6_mc_get_idx(seq, *pos); 2383 } 2384 2385 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2386 { 2387 struct ifmcaddr6 *im; 2388 im = igmp6_mc_get_next(seq, v); 2389 ++*pos; 2390 return im; 2391 } 2392 2393 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2394 { 2395 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2396 if (likely(state->idev != NULL)) { 2397 read_unlock_bh(&state->idev->lock); 2398 in6_dev_put(state->idev); 2399 state->idev = NULL; 2400 } 2401 state->dev = NULL; 2402 read_unlock(&dev_base_lock); 2403 } 2404 2405 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2406 { 2407 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2408 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2409 2410 seq_printf(seq, 2411 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2412 state->dev->ifindex, state->dev->name, 2413 NIP6(im->mca_addr), 2414 im->mca_users, im->mca_flags, 2415 (im->mca_flags&MAF_TIMER_RUNNING) ? 2416 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2417 return 0; 2418 } 2419 2420 static const struct seq_operations igmp6_mc_seq_ops = { 2421 .start = igmp6_mc_seq_start, 2422 .next = igmp6_mc_seq_next, 2423 .stop = igmp6_mc_seq_stop, 2424 .show = igmp6_mc_seq_show, 2425 }; 2426 2427 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2428 { 2429 return seq_open_private(file, &igmp6_mc_seq_ops, 2430 sizeof(struct igmp6_mc_iter_state)); 2431 } 2432 2433 static const struct file_operations igmp6_mc_seq_fops = { 2434 .owner = THIS_MODULE, 2435 .open = igmp6_mc_seq_open, 2436 .read = seq_read, 2437 .llseek = seq_lseek, 2438 .release = seq_release_private, 2439 }; 2440 2441 struct igmp6_mcf_iter_state { 2442 struct net_device *dev; 2443 struct inet6_dev *idev; 2444 struct ifmcaddr6 *im; 2445 }; 2446 2447 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2448 2449 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2450 { 2451 struct ip6_sf_list *psf = NULL; 2452 struct ifmcaddr6 *im = NULL; 2453 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2454 2455 state->idev = NULL; 2456 state->im = NULL; 2457 for_each_netdev(&init_net, state->dev) { 2458 struct inet6_dev *idev; 2459 idev = in6_dev_get(state->dev); 2460 if (unlikely(idev == NULL)) 2461 continue; 2462 read_lock_bh(&idev->lock); 2463 im = idev->mc_list; 2464 if (likely(im != NULL)) { 2465 spin_lock_bh(&im->mca_lock); 2466 psf = im->mca_sources; 2467 if (likely(psf != NULL)) { 2468 state->im = im; 2469 state->idev = idev; 2470 break; 2471 } 2472 spin_unlock_bh(&im->mca_lock); 2473 } 2474 read_unlock_bh(&idev->lock); 2475 in6_dev_put(idev); 2476 } 2477 return psf; 2478 } 2479 2480 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2481 { 2482 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2483 2484 psf = psf->sf_next; 2485 while (!psf) { 2486 spin_unlock_bh(&state->im->mca_lock); 2487 state->im = state->im->next; 2488 while (!state->im) { 2489 if (likely(state->idev != NULL)) { 2490 read_unlock_bh(&state->idev->lock); 2491 in6_dev_put(state->idev); 2492 } 2493 state->dev = next_net_device(state->dev); 2494 if (!state->dev) { 2495 state->idev = NULL; 2496 goto out; 2497 } 2498 state->idev = in6_dev_get(state->dev); 2499 if (!state->idev) 2500 continue; 2501 read_lock_bh(&state->idev->lock); 2502 state->im = state->idev->mc_list; 2503 } 2504 if (!state->im) 2505 break; 2506 spin_lock_bh(&state->im->mca_lock); 2507 psf = state->im->mca_sources; 2508 } 2509 out: 2510 return psf; 2511 } 2512 2513 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2514 { 2515 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2516 if (psf) 2517 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2518 --pos; 2519 return pos ? NULL : psf; 2520 } 2521 2522 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2523 { 2524 read_lock(&dev_base_lock); 2525 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2526 } 2527 2528 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2529 { 2530 struct ip6_sf_list *psf; 2531 if (v == SEQ_START_TOKEN) 2532 psf = igmp6_mcf_get_first(seq); 2533 else 2534 psf = igmp6_mcf_get_next(seq, v); 2535 ++*pos; 2536 return psf; 2537 } 2538 2539 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2540 { 2541 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2542 if (likely(state->im != NULL)) { 2543 spin_unlock_bh(&state->im->mca_lock); 2544 state->im = NULL; 2545 } 2546 if (likely(state->idev != NULL)) { 2547 read_unlock_bh(&state->idev->lock); 2548 in6_dev_put(state->idev); 2549 state->idev = NULL; 2550 } 2551 state->dev = NULL; 2552 read_unlock(&dev_base_lock); 2553 } 2554 2555 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2556 { 2557 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2558 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2559 2560 if (v == SEQ_START_TOKEN) { 2561 seq_printf(seq, 2562 "%3s %6s " 2563 "%32s %32s %6s %6s\n", "Idx", 2564 "Device", "Multicast Address", 2565 "Source Address", "INC", "EXC"); 2566 } else { 2567 seq_printf(seq, 2568 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n", 2569 state->dev->ifindex, state->dev->name, 2570 NIP6(state->im->mca_addr), 2571 NIP6(psf->sf_addr), 2572 psf->sf_count[MCAST_INCLUDE], 2573 psf->sf_count[MCAST_EXCLUDE]); 2574 } 2575 return 0; 2576 } 2577 2578 static const struct seq_operations igmp6_mcf_seq_ops = { 2579 .start = igmp6_mcf_seq_start, 2580 .next = igmp6_mcf_seq_next, 2581 .stop = igmp6_mcf_seq_stop, 2582 .show = igmp6_mcf_seq_show, 2583 }; 2584 2585 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2586 { 2587 return seq_open_private(file, &igmp6_mcf_seq_ops, 2588 sizeof(struct igmp6_mcf_iter_state)); 2589 } 2590 2591 static const struct file_operations igmp6_mcf_seq_fops = { 2592 .owner = THIS_MODULE, 2593 .open = igmp6_mcf_seq_open, 2594 .read = seq_read, 2595 .llseek = seq_lseek, 2596 .release = seq_release_private, 2597 }; 2598 #endif 2599 2600 int __init igmp6_init(struct net_proto_family *ops) 2601 { 2602 struct ipv6_pinfo *np; 2603 struct sock *sk; 2604 int err; 2605 2606 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2607 if (err < 0) { 2608 printk(KERN_ERR 2609 "Failed to initialize the IGMP6 control socket (err %d).\n", 2610 err); 2611 igmp6_socket = NULL; /* For safety. */ 2612 return err; 2613 } 2614 2615 sk = igmp6_socket->sk; 2616 sk->sk_allocation = GFP_ATOMIC; 2617 sk->sk_prot->unhash(sk); 2618 2619 np = inet6_sk(sk); 2620 np->hop_limit = 1; 2621 2622 #ifdef CONFIG_PROC_FS 2623 proc_net_fops_create(&init_net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2624 proc_net_fops_create(&init_net, "mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2625 #endif 2626 2627 return 0; 2628 } 2629 2630 void igmp6_cleanup(void) 2631 { 2632 sock_release(igmp6_socket); 2633 igmp6_socket = NULL; /* for safety */ 2634 2635 #ifdef CONFIG_PROC_FS 2636 proc_net_remove(&init_net, "mcfilter6"); 2637 proc_net_remove(&init_net, "igmp6"); 2638 #endif 2639 } 2640