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 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 907 908 ipv6_addr_copy(&mc->mca_addr, addr); 909 mc->idev = idev; 910 mc->mca_users = 1; 911 /* mca_stamp should be updated upon changes */ 912 mc->mca_cstamp = mc->mca_tstamp = jiffies; 913 atomic_set(&mc->mca_refcnt, 2); 914 spin_lock_init(&mc->mca_lock); 915 916 /* initial mode is (EX, empty) */ 917 mc->mca_sfmode = MCAST_EXCLUDE; 918 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 919 920 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 921 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 922 mc->mca_flags |= MAF_NOREPORT; 923 924 mc->next = idev->mc_list; 925 idev->mc_list = mc; 926 write_unlock_bh(&idev->lock); 927 928 mld_del_delrec(idev, &mc->mca_addr); 929 igmp6_group_added(mc); 930 ma_put(mc); 931 return 0; 932 } 933 934 /* 935 * device multicast group del 936 */ 937 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) 938 { 939 struct ifmcaddr6 *ma, **map; 940 941 write_lock_bh(&idev->lock); 942 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 943 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 944 if (--ma->mca_users == 0) { 945 *map = ma->next; 946 write_unlock_bh(&idev->lock); 947 948 igmp6_group_dropped(ma); 949 950 ma_put(ma); 951 return 0; 952 } 953 write_unlock_bh(&idev->lock); 954 return 0; 955 } 956 } 957 write_unlock_bh(&idev->lock); 958 959 return -ENOENT; 960 } 961 962 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) 963 { 964 struct inet6_dev *idev = in6_dev_get(dev); 965 int err; 966 967 if (!idev) 968 return -ENODEV; 969 970 err = __ipv6_dev_mc_dec(idev, addr); 971 972 in6_dev_put(idev); 973 974 return err; 975 } 976 977 /* 978 * identify MLD packets for MLD filter exceptions 979 */ 980 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 981 { 982 struct icmp6hdr *pic; 983 984 if (nexthdr != IPPROTO_ICMPV6) 985 return 0; 986 987 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 988 return 0; 989 990 pic = icmp6_hdr(skb); 991 992 switch (pic->icmp6_type) { 993 case ICMPV6_MGM_QUERY: 994 case ICMPV6_MGM_REPORT: 995 case ICMPV6_MGM_REDUCTION: 996 case ICMPV6_MLD2_REPORT: 997 return 1; 998 default: 999 break; 1000 } 1001 return 0; 1002 } 1003 1004 /* 1005 * check if the interface/address pair is valid 1006 */ 1007 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, 1008 struct in6_addr *src_addr) 1009 { 1010 struct inet6_dev *idev; 1011 struct ifmcaddr6 *mc; 1012 int rv = 0; 1013 1014 idev = in6_dev_get(dev); 1015 if (idev) { 1016 read_lock_bh(&idev->lock); 1017 for (mc = idev->mc_list; mc; mc=mc->next) { 1018 if (ipv6_addr_equal(&mc->mca_addr, group)) 1019 break; 1020 } 1021 if (mc) { 1022 if (src_addr && !ipv6_addr_any(src_addr)) { 1023 struct ip6_sf_list *psf; 1024 1025 spin_lock_bh(&mc->mca_lock); 1026 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1027 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1028 break; 1029 } 1030 if (psf) 1031 rv = psf->sf_count[MCAST_INCLUDE] || 1032 psf->sf_count[MCAST_EXCLUDE] != 1033 mc->mca_sfcount[MCAST_EXCLUDE]; 1034 else 1035 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1036 spin_unlock_bh(&mc->mca_lock); 1037 } else 1038 rv = 1; /* don't filter unspecified source */ 1039 } 1040 read_unlock_bh(&idev->lock); 1041 in6_dev_put(idev); 1042 } 1043 return rv; 1044 } 1045 1046 static void mld_gq_start_timer(struct inet6_dev *idev) 1047 { 1048 int tv = net_random() % idev->mc_maxdelay; 1049 1050 idev->mc_gq_running = 1; 1051 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1052 in6_dev_hold(idev); 1053 } 1054 1055 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1056 { 1057 int tv = net_random() % delay; 1058 1059 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1060 in6_dev_hold(idev); 1061 } 1062 1063 /* 1064 * IGMP handling (alias multicast ICMPv6 messages) 1065 */ 1066 1067 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1068 { 1069 unsigned long delay = resptime; 1070 1071 /* Do not start timer for these addresses */ 1072 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1073 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1074 return; 1075 1076 if (del_timer(&ma->mca_timer)) { 1077 atomic_dec(&ma->mca_refcnt); 1078 delay = ma->mca_timer.expires - jiffies; 1079 } 1080 1081 if (delay >= resptime) { 1082 if (resptime) 1083 delay = net_random() % resptime; 1084 else 1085 delay = 1; 1086 } 1087 ma->mca_timer.expires = jiffies + delay; 1088 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1089 atomic_inc(&ma->mca_refcnt); 1090 ma->mca_flags |= MAF_TIMER_RUNNING; 1091 } 1092 1093 /* mark EXCLUDE-mode sources */ 1094 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1095 struct in6_addr *srcs) 1096 { 1097 struct ip6_sf_list *psf; 1098 int i, scount; 1099 1100 scount = 0; 1101 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1102 if (scount == nsrcs) 1103 break; 1104 for (i=0; i<nsrcs; i++) { 1105 /* skip inactive filters */ 1106 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1107 pmc->mca_sfcount[MCAST_EXCLUDE] != 1108 psf->sf_count[MCAST_EXCLUDE]) 1109 continue; 1110 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1111 scount++; 1112 break; 1113 } 1114 } 1115 } 1116 pmc->mca_flags &= ~MAF_GSQUERY; 1117 if (scount == nsrcs) /* all sources excluded */ 1118 return 0; 1119 return 1; 1120 } 1121 1122 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1123 struct in6_addr *srcs) 1124 { 1125 struct ip6_sf_list *psf; 1126 int i, scount; 1127 1128 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1129 return mld_xmarksources(pmc, nsrcs, srcs); 1130 1131 /* mark INCLUDE-mode sources */ 1132 1133 scount = 0; 1134 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1135 if (scount == nsrcs) 1136 break; 1137 for (i=0; i<nsrcs; i++) { 1138 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1139 psf->sf_gsresp = 1; 1140 scount++; 1141 break; 1142 } 1143 } 1144 } 1145 if (!scount) { 1146 pmc->mca_flags &= ~MAF_GSQUERY; 1147 return 0; 1148 } 1149 pmc->mca_flags |= MAF_GSQUERY; 1150 return 1; 1151 } 1152 1153 int igmp6_event_query(struct sk_buff *skb) 1154 { 1155 struct mld2_query *mlh2 = NULL; 1156 struct ifmcaddr6 *ma; 1157 struct in6_addr *group; 1158 unsigned long max_delay; 1159 struct inet6_dev *idev; 1160 struct icmp6hdr *hdr; 1161 int group_type; 1162 int mark = 0; 1163 int len; 1164 1165 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1166 return -EINVAL; 1167 1168 /* compute payload length excluding extension headers */ 1169 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1170 len -= skb_network_header_len(skb); 1171 1172 /* Drop queries with not link local source */ 1173 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1174 return -EINVAL; 1175 1176 idev = in6_dev_get(skb->dev); 1177 1178 if (idev == NULL) 1179 return 0; 1180 1181 hdr = icmp6_hdr(skb); 1182 group = (struct in6_addr *) (hdr + 1); 1183 group_type = ipv6_addr_type(group); 1184 1185 if (group_type != IPV6_ADDR_ANY && 1186 !(group_type&IPV6_ADDR_MULTICAST)) { 1187 in6_dev_put(idev); 1188 return -EINVAL; 1189 } 1190 1191 if (len == 24) { 1192 int switchback; 1193 /* MLDv1 router present */ 1194 1195 /* Translate milliseconds to jiffies */ 1196 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1197 1198 switchback = (idev->mc_qrv + 1) * max_delay; 1199 idev->mc_v1_seen = jiffies + switchback; 1200 1201 /* cancel the interface change timer */ 1202 idev->mc_ifc_count = 0; 1203 if (del_timer(&idev->mc_ifc_timer)) 1204 __in6_dev_put(idev); 1205 /* clear deleted report items */ 1206 mld_clear_delrec(idev); 1207 } else if (len >= 28) { 1208 int srcs_offset = sizeof(struct mld2_query) - 1209 sizeof(struct icmp6hdr); 1210 if (!pskb_may_pull(skb, srcs_offset)) { 1211 in6_dev_put(idev); 1212 return -EINVAL; 1213 } 1214 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1215 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1216 if (!max_delay) 1217 max_delay = 1; 1218 idev->mc_maxdelay = max_delay; 1219 if (mlh2->qrv) 1220 idev->mc_qrv = mlh2->qrv; 1221 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1222 if (mlh2->nsrcs) { 1223 in6_dev_put(idev); 1224 return -EINVAL; /* no sources allowed */ 1225 } 1226 mld_gq_start_timer(idev); 1227 in6_dev_put(idev); 1228 return 0; 1229 } 1230 /* mark sources to include, if group & source-specific */ 1231 if (mlh2->nsrcs != 0) { 1232 if (!pskb_may_pull(skb, srcs_offset + 1233 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1234 in6_dev_put(idev); 1235 return -EINVAL; 1236 } 1237 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1238 mark = 1; 1239 } 1240 } else { 1241 in6_dev_put(idev); 1242 return -EINVAL; 1243 } 1244 1245 read_lock_bh(&idev->lock); 1246 if (group_type == IPV6_ADDR_ANY) { 1247 for (ma = idev->mc_list; ma; ma=ma->next) { 1248 spin_lock_bh(&ma->mca_lock); 1249 igmp6_group_queried(ma, max_delay); 1250 spin_unlock_bh(&ma->mca_lock); 1251 } 1252 } else { 1253 for (ma = idev->mc_list; ma; ma=ma->next) { 1254 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1255 continue; 1256 spin_lock_bh(&ma->mca_lock); 1257 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1258 /* gsquery <- gsquery && mark */ 1259 if (!mark) 1260 ma->mca_flags &= ~MAF_GSQUERY; 1261 } else { 1262 /* gsquery <- mark */ 1263 if (mark) 1264 ma->mca_flags |= MAF_GSQUERY; 1265 else 1266 ma->mca_flags &= ~MAF_GSQUERY; 1267 } 1268 if (!(ma->mca_flags & MAF_GSQUERY) || 1269 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1270 igmp6_group_queried(ma, max_delay); 1271 spin_unlock_bh(&ma->mca_lock); 1272 break; 1273 } 1274 } 1275 read_unlock_bh(&idev->lock); 1276 in6_dev_put(idev); 1277 1278 return 0; 1279 } 1280 1281 1282 int igmp6_event_report(struct sk_buff *skb) 1283 { 1284 struct ifmcaddr6 *ma; 1285 struct in6_addr *addrp; 1286 struct inet6_dev *idev; 1287 struct icmp6hdr *hdr; 1288 int addr_type; 1289 1290 /* Our own report looped back. Ignore it. */ 1291 if (skb->pkt_type == PACKET_LOOPBACK) 1292 return 0; 1293 1294 /* send our report if the MC router may not have heard this report */ 1295 if (skb->pkt_type != PACKET_MULTICAST && 1296 skb->pkt_type != PACKET_BROADCAST) 1297 return 0; 1298 1299 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1300 return -EINVAL; 1301 1302 hdr = icmp6_hdr(skb); 1303 1304 /* Drop reports with not link local source */ 1305 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1306 if (addr_type != IPV6_ADDR_ANY && 1307 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1308 return -EINVAL; 1309 1310 addrp = (struct in6_addr *) (hdr + 1); 1311 1312 idev = in6_dev_get(skb->dev); 1313 if (idev == NULL) 1314 return -ENODEV; 1315 1316 /* 1317 * Cancel the timer for this group 1318 */ 1319 1320 read_lock_bh(&idev->lock); 1321 for (ma = idev->mc_list; ma; ma=ma->next) { 1322 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1323 spin_lock(&ma->mca_lock); 1324 if (del_timer(&ma->mca_timer)) 1325 atomic_dec(&ma->mca_refcnt); 1326 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1327 spin_unlock(&ma->mca_lock); 1328 break; 1329 } 1330 } 1331 read_unlock_bh(&idev->lock); 1332 in6_dev_put(idev); 1333 return 0; 1334 } 1335 1336 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1337 int gdeleted, int sdeleted) 1338 { 1339 switch (type) { 1340 case MLD2_MODE_IS_INCLUDE: 1341 case MLD2_MODE_IS_EXCLUDE: 1342 if (gdeleted || sdeleted) 1343 return 0; 1344 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1345 if (pmc->mca_sfmode == MCAST_INCLUDE) 1346 return 1; 1347 /* don't include if this source is excluded 1348 * in all filters 1349 */ 1350 if (psf->sf_count[MCAST_INCLUDE]) 1351 return type == MLD2_MODE_IS_INCLUDE; 1352 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1353 psf->sf_count[MCAST_EXCLUDE]; 1354 } 1355 return 0; 1356 case MLD2_CHANGE_TO_INCLUDE: 1357 if (gdeleted || sdeleted) 1358 return 0; 1359 return psf->sf_count[MCAST_INCLUDE] != 0; 1360 case MLD2_CHANGE_TO_EXCLUDE: 1361 if (gdeleted || sdeleted) 1362 return 0; 1363 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1364 psf->sf_count[MCAST_INCLUDE]) 1365 return 0; 1366 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1367 psf->sf_count[MCAST_EXCLUDE]; 1368 case MLD2_ALLOW_NEW_SOURCES: 1369 if (gdeleted || !psf->sf_crcount) 1370 return 0; 1371 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1372 case MLD2_BLOCK_OLD_SOURCES: 1373 if (pmc->mca_sfmode == MCAST_INCLUDE) 1374 return gdeleted || (psf->sf_crcount && sdeleted); 1375 return psf->sf_crcount && !gdeleted && !sdeleted; 1376 } 1377 return 0; 1378 } 1379 1380 static int 1381 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1382 { 1383 struct ip6_sf_list *psf; 1384 int scount = 0; 1385 1386 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1387 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1388 continue; 1389 scount++; 1390 } 1391 return scount; 1392 } 1393 1394 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1395 { 1396 struct sock *sk = igmp6_socket->sk; 1397 struct sk_buff *skb; 1398 struct mld2_report *pmr; 1399 struct in6_addr addr_buf; 1400 int err; 1401 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1402 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1403 IPV6_TLV_PADN, 0 }; 1404 1405 /* we assume size > sizeof(ra) here */ 1406 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1407 1408 if (!skb) 1409 return NULL; 1410 1411 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1412 1413 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1414 /* <draft-ietf-magma-mld-source-05.txt>: 1415 * use unspecified address as the source address 1416 * when a valid link-local address is not available. 1417 */ 1418 memset(&addr_buf, 0, sizeof(addr_buf)); 1419 } 1420 1421 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1422 1423 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1424 1425 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1426 skb_put(skb, sizeof(*pmr)); 1427 pmr = (struct mld2_report *)skb_transport_header(skb); 1428 pmr->type = ICMPV6_MLD2_REPORT; 1429 pmr->resv1 = 0; 1430 pmr->csum = 0; 1431 pmr->resv2 = 0; 1432 pmr->ngrec = 0; 1433 return skb; 1434 } 1435 1436 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1437 { 1438 struct net_device *dev = skb->dev; 1439 unsigned char ha[MAX_ADDR_LEN]; 1440 1441 ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1); 1442 if (dev_hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len) < 0) { 1443 kfree_skb(skb); 1444 return -EINVAL; 1445 } 1446 return dev_queue_xmit(skb); 1447 } 1448 1449 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1450 { 1451 return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev, 1452 mld_dev_queue_xmit2); 1453 } 1454 1455 static void mld_sendpack(struct sk_buff *skb) 1456 { 1457 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1458 struct mld2_report *pmr = 1459 (struct mld2_report *)skb_transport_header(skb); 1460 int payload_len, mldlen; 1461 struct inet6_dev *idev = in6_dev_get(skb->dev); 1462 int err; 1463 1464 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); 1465 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1466 mldlen = skb->tail - skb->transport_header; 1467 pip6->payload_len = htons(payload_len); 1468 1469 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1470 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), 1471 mldlen, 0)); 1472 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1473 mld_dev_queue_xmit); 1474 if (!err) { 1475 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT); 1476 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 1477 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS); 1478 } else 1479 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS); 1480 1481 if (likely(idev != NULL)) 1482 in6_dev_put(idev); 1483 } 1484 1485 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1486 { 1487 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1488 } 1489 1490 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1491 int type, struct mld2_grec **ppgr) 1492 { 1493 struct net_device *dev = pmc->idev->dev; 1494 struct mld2_report *pmr; 1495 struct mld2_grec *pgr; 1496 1497 if (!skb) 1498 skb = mld_newpack(dev, dev->mtu); 1499 if (!skb) 1500 return NULL; 1501 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1502 pgr->grec_type = type; 1503 pgr->grec_auxwords = 0; 1504 pgr->grec_nsrcs = 0; 1505 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1506 pmr = (struct mld2_report *)skb_transport_header(skb); 1507 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1508 *ppgr = pgr; 1509 return skb; 1510 } 1511 1512 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1513 skb_tailroom(skb)) : 0) 1514 1515 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1516 int type, int gdeleted, int sdeleted) 1517 { 1518 struct net_device *dev = pmc->idev->dev; 1519 struct mld2_report *pmr; 1520 struct mld2_grec *pgr = NULL; 1521 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1522 int scount, stotal, first, isquery, truncate; 1523 1524 if (pmc->mca_flags & MAF_NOREPORT) 1525 return skb; 1526 1527 isquery = type == MLD2_MODE_IS_INCLUDE || 1528 type == MLD2_MODE_IS_EXCLUDE; 1529 truncate = type == MLD2_MODE_IS_EXCLUDE || 1530 type == MLD2_CHANGE_TO_EXCLUDE; 1531 1532 stotal = scount = 0; 1533 1534 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1535 1536 if (!*psf_list) 1537 goto empty_source; 1538 1539 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1540 1541 /* EX and TO_EX get a fresh packet, if needed */ 1542 if (truncate) { 1543 if (pmr && pmr->ngrec && 1544 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1545 if (skb) 1546 mld_sendpack(skb); 1547 skb = mld_newpack(dev, dev->mtu); 1548 } 1549 } 1550 first = 1; 1551 psf_prev = NULL; 1552 for (psf=*psf_list; psf; psf=psf_next) { 1553 struct in6_addr *psrc; 1554 1555 psf_next = psf->sf_next; 1556 1557 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1558 psf_prev = psf; 1559 continue; 1560 } 1561 1562 /* clear marks on query responses */ 1563 if (isquery) 1564 psf->sf_gsresp = 0; 1565 1566 if (AVAILABLE(skb) < sizeof(*psrc) + 1567 first*sizeof(struct mld2_grec)) { 1568 if (truncate && !first) 1569 break; /* truncate these */ 1570 if (pgr) 1571 pgr->grec_nsrcs = htons(scount); 1572 if (skb) 1573 mld_sendpack(skb); 1574 skb = mld_newpack(dev, dev->mtu); 1575 first = 1; 1576 scount = 0; 1577 } 1578 if (first) { 1579 skb = add_grhead(skb, pmc, type, &pgr); 1580 first = 0; 1581 } 1582 if (!skb) 1583 return NULL; 1584 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1585 *psrc = psf->sf_addr; 1586 scount++; stotal++; 1587 if ((type == MLD2_ALLOW_NEW_SOURCES || 1588 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1589 psf->sf_crcount--; 1590 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1591 if (psf_prev) 1592 psf_prev->sf_next = psf->sf_next; 1593 else 1594 *psf_list = psf->sf_next; 1595 kfree(psf); 1596 continue; 1597 } 1598 } 1599 psf_prev = psf; 1600 } 1601 1602 empty_source: 1603 if (!stotal) { 1604 if (type == MLD2_ALLOW_NEW_SOURCES || 1605 type == MLD2_BLOCK_OLD_SOURCES) 1606 return skb; 1607 if (pmc->mca_crcount || isquery) { 1608 /* make sure we have room for group header */ 1609 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1610 mld_sendpack(skb); 1611 skb = NULL; /* add_grhead will get a new one */ 1612 } 1613 skb = add_grhead(skb, pmc, type, &pgr); 1614 } 1615 } 1616 if (pgr) 1617 pgr->grec_nsrcs = htons(scount); 1618 1619 if (isquery) 1620 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1621 return skb; 1622 } 1623 1624 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1625 { 1626 struct sk_buff *skb = NULL; 1627 int type; 1628 1629 if (!pmc) { 1630 read_lock_bh(&idev->lock); 1631 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1632 if (pmc->mca_flags & MAF_NOREPORT) 1633 continue; 1634 spin_lock_bh(&pmc->mca_lock); 1635 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1636 type = MLD2_MODE_IS_EXCLUDE; 1637 else 1638 type = MLD2_MODE_IS_INCLUDE; 1639 skb = add_grec(skb, pmc, type, 0, 0); 1640 spin_unlock_bh(&pmc->mca_lock); 1641 } 1642 read_unlock_bh(&idev->lock); 1643 } else { 1644 spin_lock_bh(&pmc->mca_lock); 1645 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1646 type = MLD2_MODE_IS_EXCLUDE; 1647 else 1648 type = MLD2_MODE_IS_INCLUDE; 1649 skb = add_grec(skb, pmc, type, 0, 0); 1650 spin_unlock_bh(&pmc->mca_lock); 1651 } 1652 if (skb) 1653 mld_sendpack(skb); 1654 } 1655 1656 /* 1657 * remove zero-count source records from a source filter list 1658 */ 1659 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1660 { 1661 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1662 1663 psf_prev = NULL; 1664 for (psf=*ppsf; psf; psf = psf_next) { 1665 psf_next = psf->sf_next; 1666 if (psf->sf_crcount == 0) { 1667 if (psf_prev) 1668 psf_prev->sf_next = psf->sf_next; 1669 else 1670 *ppsf = psf->sf_next; 1671 kfree(psf); 1672 } else 1673 psf_prev = psf; 1674 } 1675 } 1676 1677 static void mld_send_cr(struct inet6_dev *idev) 1678 { 1679 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1680 struct sk_buff *skb = NULL; 1681 int type, dtype; 1682 1683 read_lock_bh(&idev->lock); 1684 write_lock_bh(&idev->mc_lock); 1685 1686 /* deleted MCA's */ 1687 pmc_prev = NULL; 1688 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1689 pmc_next = pmc->next; 1690 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1691 type = MLD2_BLOCK_OLD_SOURCES; 1692 dtype = MLD2_BLOCK_OLD_SOURCES; 1693 skb = add_grec(skb, pmc, type, 1, 0); 1694 skb = add_grec(skb, pmc, dtype, 1, 1); 1695 } 1696 if (pmc->mca_crcount) { 1697 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1698 type = MLD2_CHANGE_TO_INCLUDE; 1699 skb = add_grec(skb, pmc, type, 1, 0); 1700 } 1701 pmc->mca_crcount--; 1702 if (pmc->mca_crcount == 0) { 1703 mld_clear_zeros(&pmc->mca_tomb); 1704 mld_clear_zeros(&pmc->mca_sources); 1705 } 1706 } 1707 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1708 !pmc->mca_sources) { 1709 if (pmc_prev) 1710 pmc_prev->next = pmc_next; 1711 else 1712 idev->mc_tomb = pmc_next; 1713 in6_dev_put(pmc->idev); 1714 kfree(pmc); 1715 } else 1716 pmc_prev = pmc; 1717 } 1718 write_unlock_bh(&idev->mc_lock); 1719 1720 /* change recs */ 1721 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1722 spin_lock_bh(&pmc->mca_lock); 1723 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1724 type = MLD2_BLOCK_OLD_SOURCES; 1725 dtype = MLD2_ALLOW_NEW_SOURCES; 1726 } else { 1727 type = MLD2_ALLOW_NEW_SOURCES; 1728 dtype = MLD2_BLOCK_OLD_SOURCES; 1729 } 1730 skb = add_grec(skb, pmc, type, 0, 0); 1731 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1732 1733 /* filter mode changes */ 1734 if (pmc->mca_crcount) { 1735 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1736 type = MLD2_CHANGE_TO_EXCLUDE; 1737 else 1738 type = MLD2_CHANGE_TO_INCLUDE; 1739 skb = add_grec(skb, pmc, type, 0, 0); 1740 pmc->mca_crcount--; 1741 } 1742 spin_unlock_bh(&pmc->mca_lock); 1743 } 1744 read_unlock_bh(&idev->lock); 1745 if (!skb) 1746 return; 1747 (void) mld_sendpack(skb); 1748 } 1749 1750 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1751 { 1752 struct sock *sk = igmp6_socket->sk; 1753 struct inet6_dev *idev; 1754 struct sk_buff *skb; 1755 struct icmp6hdr *hdr; 1756 struct in6_addr *snd_addr; 1757 struct in6_addr *addrp; 1758 struct in6_addr addr_buf; 1759 struct in6_addr all_routers; 1760 int err, len, payload_len, full_len; 1761 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1762 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1763 IPV6_TLV_PADN, 0 }; 1764 1765 rcu_read_lock(); 1766 IP6_INC_STATS(__in6_dev_get(dev), 1767 IPSTATS_MIB_OUTREQUESTS); 1768 rcu_read_unlock(); 1769 snd_addr = addr; 1770 if (type == ICMPV6_MGM_REDUCTION) { 1771 snd_addr = &all_routers; 1772 ipv6_addr_all_routers(&all_routers); 1773 } 1774 1775 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1776 payload_len = len + sizeof(ra); 1777 full_len = sizeof(struct ipv6hdr) + payload_len; 1778 1779 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1780 1781 if (skb == NULL) { 1782 rcu_read_lock(); 1783 IP6_INC_STATS(__in6_dev_get(dev), 1784 IPSTATS_MIB_OUTDISCARDS); 1785 rcu_read_unlock(); 1786 return; 1787 } 1788 1789 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1790 1791 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1792 /* <draft-ietf-magma-mld-source-05.txt>: 1793 * use unspecified address as the source address 1794 * when a valid link-local address is not available. 1795 */ 1796 memset(&addr_buf, 0, sizeof(addr_buf)); 1797 } 1798 1799 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1800 1801 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1802 1803 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1804 memset(hdr, 0, sizeof(struct icmp6hdr)); 1805 hdr->icmp6_type = type; 1806 1807 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1808 ipv6_addr_copy(addrp, addr); 1809 1810 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1811 IPPROTO_ICMPV6, 1812 csum_partial((__u8 *) hdr, len, 0)); 1813 1814 idev = in6_dev_get(skb->dev); 1815 1816 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1817 mld_dev_queue_xmit); 1818 if (!err) { 1819 ICMP6MSGOUT_INC_STATS(idev, type); 1820 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1821 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); 1822 } else 1823 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); 1824 1825 if (likely(idev != NULL)) 1826 in6_dev_put(idev); 1827 return; 1828 } 1829 1830 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1831 struct in6_addr *psfsrc) 1832 { 1833 struct ip6_sf_list *psf, *psf_prev; 1834 int rv = 0; 1835 1836 psf_prev = NULL; 1837 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1838 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1839 break; 1840 psf_prev = psf; 1841 } 1842 if (!psf || psf->sf_count[sfmode] == 0) { 1843 /* source filter not found, or count wrong => bug */ 1844 return -ESRCH; 1845 } 1846 psf->sf_count[sfmode]--; 1847 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1848 struct inet6_dev *idev = pmc->idev; 1849 1850 /* no more filters for this source */ 1851 if (psf_prev) 1852 psf_prev->sf_next = psf->sf_next; 1853 else 1854 pmc->mca_sources = psf->sf_next; 1855 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1856 !MLD_V1_SEEN(idev)) { 1857 psf->sf_crcount = idev->mc_qrv; 1858 psf->sf_next = pmc->mca_tomb; 1859 pmc->mca_tomb = psf; 1860 rv = 1; 1861 } else 1862 kfree(psf); 1863 } 1864 return rv; 1865 } 1866 1867 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1868 int sfmode, int sfcount, struct in6_addr *psfsrc, 1869 int delta) 1870 { 1871 struct ifmcaddr6 *pmc; 1872 int changerec = 0; 1873 int i, err; 1874 1875 if (!idev) 1876 return -ENODEV; 1877 read_lock_bh(&idev->lock); 1878 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1879 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1880 break; 1881 } 1882 if (!pmc) { 1883 /* MCA not found?? bug */ 1884 read_unlock_bh(&idev->lock); 1885 return -ESRCH; 1886 } 1887 spin_lock_bh(&pmc->mca_lock); 1888 sf_markstate(pmc); 1889 if (!delta) { 1890 if (!pmc->mca_sfcount[sfmode]) { 1891 spin_unlock_bh(&pmc->mca_lock); 1892 read_unlock_bh(&idev->lock); 1893 return -EINVAL; 1894 } 1895 pmc->mca_sfcount[sfmode]--; 1896 } 1897 err = 0; 1898 for (i=0; i<sfcount; i++) { 1899 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1900 1901 changerec |= rv > 0; 1902 if (!err && rv < 0) 1903 err = rv; 1904 } 1905 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1906 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1907 pmc->mca_sfcount[MCAST_INCLUDE]) { 1908 struct ip6_sf_list *psf; 1909 1910 /* filter mode change */ 1911 pmc->mca_sfmode = MCAST_INCLUDE; 1912 pmc->mca_crcount = idev->mc_qrv; 1913 idev->mc_ifc_count = pmc->mca_crcount; 1914 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1915 psf->sf_crcount = 0; 1916 mld_ifc_event(pmc->idev); 1917 } else if (sf_setstate(pmc) || changerec) 1918 mld_ifc_event(pmc->idev); 1919 spin_unlock_bh(&pmc->mca_lock); 1920 read_unlock_bh(&idev->lock); 1921 return err; 1922 } 1923 1924 /* 1925 * Add multicast single-source filter to the interface list 1926 */ 1927 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1928 struct in6_addr *psfsrc, int delta) 1929 { 1930 struct ip6_sf_list *psf, *psf_prev; 1931 1932 psf_prev = NULL; 1933 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1934 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1935 break; 1936 psf_prev = psf; 1937 } 1938 if (!psf) { 1939 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1940 if (!psf) 1941 return -ENOBUFS; 1942 1943 psf->sf_addr = *psfsrc; 1944 if (psf_prev) { 1945 psf_prev->sf_next = psf; 1946 } else 1947 pmc->mca_sources = psf; 1948 } 1949 psf->sf_count[sfmode]++; 1950 return 0; 1951 } 1952 1953 static void sf_markstate(struct ifmcaddr6 *pmc) 1954 { 1955 struct ip6_sf_list *psf; 1956 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1957 1958 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1959 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1960 psf->sf_oldin = mca_xcount == 1961 psf->sf_count[MCAST_EXCLUDE] && 1962 !psf->sf_count[MCAST_INCLUDE]; 1963 } else 1964 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1965 } 1966 1967 static int sf_setstate(struct ifmcaddr6 *pmc) 1968 { 1969 struct ip6_sf_list *psf, *dpsf; 1970 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1971 int qrv = pmc->idev->mc_qrv; 1972 int new_in, rv; 1973 1974 rv = 0; 1975 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1976 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1977 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1978 !psf->sf_count[MCAST_INCLUDE]; 1979 } else 1980 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1981 if (new_in) { 1982 if (!psf->sf_oldin) { 1983 struct ip6_sf_list *prev = NULL; 1984 1985 for (dpsf=pmc->mca_tomb; dpsf; 1986 dpsf=dpsf->sf_next) { 1987 if (ipv6_addr_equal(&dpsf->sf_addr, 1988 &psf->sf_addr)) 1989 break; 1990 prev = dpsf; 1991 } 1992 if (dpsf) { 1993 if (prev) 1994 prev->sf_next = dpsf->sf_next; 1995 else 1996 pmc->mca_tomb = dpsf->sf_next; 1997 kfree(dpsf); 1998 } 1999 psf->sf_crcount = qrv; 2000 rv++; 2001 } 2002 } else if (psf->sf_oldin) { 2003 psf->sf_crcount = 0; 2004 /* 2005 * add or update "delete" records if an active filter 2006 * is now inactive 2007 */ 2008 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2009 if (ipv6_addr_equal(&dpsf->sf_addr, 2010 &psf->sf_addr)) 2011 break; 2012 if (!dpsf) { 2013 dpsf = (struct ip6_sf_list *) 2014 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2015 if (!dpsf) 2016 continue; 2017 *dpsf = *psf; 2018 /* pmc->mca_lock held by callers */ 2019 dpsf->sf_next = pmc->mca_tomb; 2020 pmc->mca_tomb = dpsf; 2021 } 2022 dpsf->sf_crcount = qrv; 2023 rv++; 2024 } 2025 } 2026 return rv; 2027 } 2028 2029 /* 2030 * Add multicast source filter list to the interface list 2031 */ 2032 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2033 int sfmode, int sfcount, struct in6_addr *psfsrc, 2034 int delta) 2035 { 2036 struct ifmcaddr6 *pmc; 2037 int isexclude; 2038 int i, err; 2039 2040 if (!idev) 2041 return -ENODEV; 2042 read_lock_bh(&idev->lock); 2043 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2044 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2045 break; 2046 } 2047 if (!pmc) { 2048 /* MCA not found?? bug */ 2049 read_unlock_bh(&idev->lock); 2050 return -ESRCH; 2051 } 2052 spin_lock_bh(&pmc->mca_lock); 2053 2054 sf_markstate(pmc); 2055 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2056 if (!delta) 2057 pmc->mca_sfcount[sfmode]++; 2058 err = 0; 2059 for (i=0; i<sfcount; i++) { 2060 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2061 if (err) 2062 break; 2063 } 2064 if (err) { 2065 int j; 2066 2067 if (!delta) 2068 pmc->mca_sfcount[sfmode]--; 2069 for (j=0; j<i; j++) 2070 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2071 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2072 struct inet6_dev *idev = pmc->idev; 2073 struct ip6_sf_list *psf; 2074 2075 /* filter mode change */ 2076 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2077 pmc->mca_sfmode = MCAST_EXCLUDE; 2078 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2079 pmc->mca_sfmode = MCAST_INCLUDE; 2080 /* else no filters; keep old mode for reports */ 2081 2082 pmc->mca_crcount = idev->mc_qrv; 2083 idev->mc_ifc_count = pmc->mca_crcount; 2084 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2085 psf->sf_crcount = 0; 2086 mld_ifc_event(idev); 2087 } else if (sf_setstate(pmc)) 2088 mld_ifc_event(idev); 2089 spin_unlock_bh(&pmc->mca_lock); 2090 read_unlock_bh(&idev->lock); 2091 return err; 2092 } 2093 2094 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2095 { 2096 struct ip6_sf_list *psf, *nextpsf; 2097 2098 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2099 nextpsf = psf->sf_next; 2100 kfree(psf); 2101 } 2102 pmc->mca_tomb = NULL; 2103 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2104 nextpsf = psf->sf_next; 2105 kfree(psf); 2106 } 2107 pmc->mca_sources = NULL; 2108 pmc->mca_sfmode = MCAST_EXCLUDE; 2109 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2110 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2111 } 2112 2113 2114 static void igmp6_join_group(struct ifmcaddr6 *ma) 2115 { 2116 unsigned long delay; 2117 2118 if (ma->mca_flags & MAF_NOREPORT) 2119 return; 2120 2121 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2122 2123 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2124 2125 spin_lock_bh(&ma->mca_lock); 2126 if (del_timer(&ma->mca_timer)) { 2127 atomic_dec(&ma->mca_refcnt); 2128 delay = ma->mca_timer.expires - jiffies; 2129 } 2130 2131 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2132 atomic_inc(&ma->mca_refcnt); 2133 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2134 spin_unlock_bh(&ma->mca_lock); 2135 } 2136 2137 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2138 struct inet6_dev *idev) 2139 { 2140 int err; 2141 2142 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2143 * so no other readers or writers of iml or its sflist 2144 */ 2145 if (!iml->sflist) { 2146 /* any-source empty exclude case */ 2147 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2148 } 2149 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2150 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2151 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2152 iml->sflist = NULL; 2153 return err; 2154 } 2155 2156 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2157 { 2158 if (MLD_V1_SEEN(ma->idev)) { 2159 if (ma->mca_flags & MAF_LAST_REPORTER) 2160 igmp6_send(&ma->mca_addr, ma->idev->dev, 2161 ICMPV6_MGM_REDUCTION); 2162 } else { 2163 mld_add_delrec(ma->idev, ma); 2164 mld_ifc_event(ma->idev); 2165 } 2166 } 2167 2168 static void mld_gq_timer_expire(unsigned long data) 2169 { 2170 struct inet6_dev *idev = (struct inet6_dev *)data; 2171 2172 idev->mc_gq_running = 0; 2173 mld_send_report(idev, NULL); 2174 __in6_dev_put(idev); 2175 } 2176 2177 static void mld_ifc_timer_expire(unsigned long data) 2178 { 2179 struct inet6_dev *idev = (struct inet6_dev *)data; 2180 2181 mld_send_cr(idev); 2182 if (idev->mc_ifc_count) { 2183 idev->mc_ifc_count--; 2184 if (idev->mc_ifc_count) 2185 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2186 } 2187 __in6_dev_put(idev); 2188 } 2189 2190 static void mld_ifc_event(struct inet6_dev *idev) 2191 { 2192 if (MLD_V1_SEEN(idev)) 2193 return; 2194 idev->mc_ifc_count = idev->mc_qrv; 2195 mld_ifc_start_timer(idev, 1); 2196 } 2197 2198 2199 static void igmp6_timer_handler(unsigned long data) 2200 { 2201 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2202 2203 if (MLD_V1_SEEN(ma->idev)) 2204 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2205 else 2206 mld_send_report(ma->idev, ma); 2207 2208 spin_lock(&ma->mca_lock); 2209 ma->mca_flags |= MAF_LAST_REPORTER; 2210 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2211 spin_unlock(&ma->mca_lock); 2212 ma_put(ma); 2213 } 2214 2215 /* Device going down */ 2216 2217 void ipv6_mc_down(struct inet6_dev *idev) 2218 { 2219 struct ifmcaddr6 *i; 2220 2221 /* Withdraw multicast list */ 2222 2223 read_lock_bh(&idev->lock); 2224 idev->mc_ifc_count = 0; 2225 if (del_timer(&idev->mc_ifc_timer)) 2226 __in6_dev_put(idev); 2227 idev->mc_gq_running = 0; 2228 if (del_timer(&idev->mc_gq_timer)) 2229 __in6_dev_put(idev); 2230 2231 for (i = idev->mc_list; i; i=i->next) 2232 igmp6_group_dropped(i); 2233 read_unlock_bh(&idev->lock); 2234 2235 mld_clear_delrec(idev); 2236 } 2237 2238 2239 /* Device going up */ 2240 2241 void ipv6_mc_up(struct inet6_dev *idev) 2242 { 2243 struct ifmcaddr6 *i; 2244 2245 /* Install multicast list, except for all-nodes (already installed) */ 2246 2247 read_lock_bh(&idev->lock); 2248 for (i = idev->mc_list; i; i=i->next) 2249 igmp6_group_added(i); 2250 read_unlock_bh(&idev->lock); 2251 } 2252 2253 /* IPv6 device initialization. */ 2254 2255 void ipv6_mc_init_dev(struct inet6_dev *idev) 2256 { 2257 write_lock_bh(&idev->lock); 2258 rwlock_init(&idev->mc_lock); 2259 idev->mc_gq_running = 0; 2260 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2261 (unsigned long)idev); 2262 idev->mc_tomb = NULL; 2263 idev->mc_ifc_count = 0; 2264 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2265 (unsigned long)idev); 2266 idev->mc_qrv = MLD_QRV_DEFAULT; 2267 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2268 idev->mc_v1_seen = 0; 2269 write_unlock_bh(&idev->lock); 2270 } 2271 2272 /* 2273 * Device is about to be destroyed: clean up. 2274 */ 2275 2276 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2277 { 2278 struct ifmcaddr6 *i; 2279 struct in6_addr maddr; 2280 2281 /* Deactivate timers */ 2282 ipv6_mc_down(idev); 2283 2284 /* Delete all-nodes address. */ 2285 ipv6_addr_all_nodes(&maddr); 2286 2287 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2288 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2289 * fail. 2290 */ 2291 __ipv6_dev_mc_dec(idev, &maddr); 2292 2293 if (idev->cnf.forwarding) { 2294 ipv6_addr_all_routers(&maddr); 2295 __ipv6_dev_mc_dec(idev, &maddr); 2296 } 2297 2298 write_lock_bh(&idev->lock); 2299 while ((i = idev->mc_list) != NULL) { 2300 idev->mc_list = i->next; 2301 write_unlock_bh(&idev->lock); 2302 2303 igmp6_group_dropped(i); 2304 ma_put(i); 2305 2306 write_lock_bh(&idev->lock); 2307 } 2308 write_unlock_bh(&idev->lock); 2309 } 2310 2311 #ifdef CONFIG_PROC_FS 2312 struct igmp6_mc_iter_state { 2313 struct net_device *dev; 2314 struct inet6_dev *idev; 2315 }; 2316 2317 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2318 2319 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2320 { 2321 struct ifmcaddr6 *im = NULL; 2322 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2323 2324 state->idev = NULL; 2325 for_each_netdev(&init_net, state->dev) { 2326 struct inet6_dev *idev; 2327 idev = in6_dev_get(state->dev); 2328 if (!idev) 2329 continue; 2330 read_lock_bh(&idev->lock); 2331 im = idev->mc_list; 2332 if (im) { 2333 state->idev = idev; 2334 break; 2335 } 2336 read_unlock_bh(&idev->lock); 2337 in6_dev_put(idev); 2338 } 2339 return im; 2340 } 2341 2342 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2343 { 2344 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2345 2346 im = im->next; 2347 while (!im) { 2348 if (likely(state->idev != NULL)) { 2349 read_unlock_bh(&state->idev->lock); 2350 in6_dev_put(state->idev); 2351 } 2352 state->dev = next_net_device(state->dev); 2353 if (!state->dev) { 2354 state->idev = NULL; 2355 break; 2356 } 2357 state->idev = in6_dev_get(state->dev); 2358 if (!state->idev) 2359 continue; 2360 read_lock_bh(&state->idev->lock); 2361 im = state->idev->mc_list; 2362 } 2363 return im; 2364 } 2365 2366 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2367 { 2368 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2369 if (im) 2370 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2371 --pos; 2372 return pos ? NULL : im; 2373 } 2374 2375 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2376 __acquires(dev_base_lock) 2377 { 2378 read_lock(&dev_base_lock); 2379 return igmp6_mc_get_idx(seq, *pos); 2380 } 2381 2382 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2383 { 2384 struct ifmcaddr6 *im; 2385 im = igmp6_mc_get_next(seq, v); 2386 ++*pos; 2387 return im; 2388 } 2389 2390 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2391 __releases(dev_base_lock) 2392 { 2393 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2394 if (likely(state->idev != NULL)) { 2395 read_unlock_bh(&state->idev->lock); 2396 in6_dev_put(state->idev); 2397 state->idev = NULL; 2398 } 2399 state->dev = NULL; 2400 read_unlock(&dev_base_lock); 2401 } 2402 2403 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2404 { 2405 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2406 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2407 2408 seq_printf(seq, 2409 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2410 state->dev->ifindex, state->dev->name, 2411 NIP6(im->mca_addr), 2412 im->mca_users, im->mca_flags, 2413 (im->mca_flags&MAF_TIMER_RUNNING) ? 2414 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2415 return 0; 2416 } 2417 2418 static const struct seq_operations igmp6_mc_seq_ops = { 2419 .start = igmp6_mc_seq_start, 2420 .next = igmp6_mc_seq_next, 2421 .stop = igmp6_mc_seq_stop, 2422 .show = igmp6_mc_seq_show, 2423 }; 2424 2425 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2426 { 2427 return seq_open_private(file, &igmp6_mc_seq_ops, 2428 sizeof(struct igmp6_mc_iter_state)); 2429 } 2430 2431 static const struct file_operations igmp6_mc_seq_fops = { 2432 .owner = THIS_MODULE, 2433 .open = igmp6_mc_seq_open, 2434 .read = seq_read, 2435 .llseek = seq_lseek, 2436 .release = seq_release_private, 2437 }; 2438 2439 struct igmp6_mcf_iter_state { 2440 struct net_device *dev; 2441 struct inet6_dev *idev; 2442 struct ifmcaddr6 *im; 2443 }; 2444 2445 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2446 2447 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2448 { 2449 struct ip6_sf_list *psf = NULL; 2450 struct ifmcaddr6 *im = NULL; 2451 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2452 2453 state->idev = NULL; 2454 state->im = NULL; 2455 for_each_netdev(&init_net, state->dev) { 2456 struct inet6_dev *idev; 2457 idev = in6_dev_get(state->dev); 2458 if (unlikely(idev == NULL)) 2459 continue; 2460 read_lock_bh(&idev->lock); 2461 im = idev->mc_list; 2462 if (likely(im != NULL)) { 2463 spin_lock_bh(&im->mca_lock); 2464 psf = im->mca_sources; 2465 if (likely(psf != NULL)) { 2466 state->im = im; 2467 state->idev = idev; 2468 break; 2469 } 2470 spin_unlock_bh(&im->mca_lock); 2471 } 2472 read_unlock_bh(&idev->lock); 2473 in6_dev_put(idev); 2474 } 2475 return psf; 2476 } 2477 2478 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2479 { 2480 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2481 2482 psf = psf->sf_next; 2483 while (!psf) { 2484 spin_unlock_bh(&state->im->mca_lock); 2485 state->im = state->im->next; 2486 while (!state->im) { 2487 if (likely(state->idev != NULL)) { 2488 read_unlock_bh(&state->idev->lock); 2489 in6_dev_put(state->idev); 2490 } 2491 state->dev = next_net_device(state->dev); 2492 if (!state->dev) { 2493 state->idev = NULL; 2494 goto out; 2495 } 2496 state->idev = in6_dev_get(state->dev); 2497 if (!state->idev) 2498 continue; 2499 read_lock_bh(&state->idev->lock); 2500 state->im = state->idev->mc_list; 2501 } 2502 if (!state->im) 2503 break; 2504 spin_lock_bh(&state->im->mca_lock); 2505 psf = state->im->mca_sources; 2506 } 2507 out: 2508 return psf; 2509 } 2510 2511 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2512 { 2513 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2514 if (psf) 2515 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2516 --pos; 2517 return pos ? NULL : psf; 2518 } 2519 2520 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2521 __acquires(dev_base_lock) 2522 { 2523 read_lock(&dev_base_lock); 2524 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2525 } 2526 2527 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2528 { 2529 struct ip6_sf_list *psf; 2530 if (v == SEQ_START_TOKEN) 2531 psf = igmp6_mcf_get_first(seq); 2532 else 2533 psf = igmp6_mcf_get_next(seq, v); 2534 ++*pos; 2535 return psf; 2536 } 2537 2538 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2539 __releases(dev_base_lock) 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