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 #include <net/inet_common.h> 63 64 #include <net/ip6_checksum.h> 65 66 /* Set to 3 to get tracing... */ 67 #define MCAST_DEBUG 2 68 69 #if MCAST_DEBUG >= 3 70 #define MDBG(x) printk x 71 #else 72 #define MDBG(x) 73 #endif 74 75 /* 76 * These header formats should be in a separate include file, but icmpv6.h 77 * doesn't have in6_addr defined in all cases, there is no __u128, and no 78 * other files reference these. 79 * 80 * +-DLS 4/14/03 81 */ 82 83 /* Multicast Listener Discovery version 2 headers */ 84 85 struct mld2_grec { 86 __u8 grec_type; 87 __u8 grec_auxwords; 88 __be16 grec_nsrcs; 89 struct in6_addr grec_mca; 90 struct in6_addr grec_src[0]; 91 }; 92 93 struct mld2_report { 94 __u8 type; 95 __u8 resv1; 96 __sum16 csum; 97 __be16 resv2; 98 __be16 ngrec; 99 struct mld2_grec grec[0]; 100 }; 101 102 struct mld2_query { 103 __u8 type; 104 __u8 code; 105 __sum16 csum; 106 __be16 mrc; 107 __be16 resv1; 108 struct in6_addr mca; 109 #if defined(__LITTLE_ENDIAN_BITFIELD) 110 __u8 qrv:3, 111 suppress:1, 112 resv2:4; 113 #elif defined(__BIG_ENDIAN_BITFIELD) 114 __u8 resv2:4, 115 suppress:1, 116 qrv:3; 117 #else 118 #error "Please fix <asm/byteorder.h>" 119 #endif 120 __u8 qqic; 121 __be16 nsrcs; 122 struct in6_addr srcs[0]; 123 }; 124 125 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 126 127 /* Big mc list lock for all the sockets */ 128 static DEFINE_RWLOCK(ipv6_sk_mc_lock); 129 130 static void igmp6_join_group(struct ifmcaddr6 *ma); 131 static void igmp6_leave_group(struct ifmcaddr6 *ma); 132 static void igmp6_timer_handler(unsigned long data); 133 134 static void mld_gq_timer_expire(unsigned long data); 135 static void mld_ifc_timer_expire(unsigned long data); 136 static void mld_ifc_event(struct inet6_dev *idev); 137 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 138 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 139 static void mld_clear_delrec(struct inet6_dev *idev); 140 static int sf_setstate(struct ifmcaddr6 *pmc); 141 static void sf_markstate(struct ifmcaddr6 *pmc); 142 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 143 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 144 int sfmode, int sfcount, struct in6_addr *psfsrc, 145 int delta); 146 static int ip6_mc_add_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_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 150 struct inet6_dev *idev); 151 152 153 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 154 #define MLD_QRV_DEFAULT 2 155 156 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \ 157 (idev)->cnf.force_mld_version == 1 || \ 158 ((idev)->mc_v1_seen && \ 159 time_before(jiffies, (idev)->mc_v1_seen))) 160 161 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 162 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 163 ((value) < (thresh) ? (value) : \ 164 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \ 165 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 166 167 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) 168 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) 169 170 #define IPV6_MLD_MAX_MSF 64 171 172 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 173 174 /* 175 * socket join on multicast group 176 */ 177 178 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) 179 { 180 struct net_device *dev = NULL; 181 struct ipv6_mc_socklist *mc_lst; 182 struct ipv6_pinfo *np = inet6_sk(sk); 183 struct net *net = sock_net(sk); 184 int err; 185 186 if (!ipv6_addr_is_multicast(addr)) 187 return -EINVAL; 188 189 read_lock_bh(&ipv6_sk_mc_lock); 190 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 191 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 192 ipv6_addr_equal(&mc_lst->addr, addr)) { 193 read_unlock_bh(&ipv6_sk_mc_lock); 194 return -EADDRINUSE; 195 } 196 } 197 read_unlock_bh(&ipv6_sk_mc_lock); 198 199 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 200 201 if (mc_lst == NULL) 202 return -ENOMEM; 203 204 mc_lst->next = NULL; 205 ipv6_addr_copy(&mc_lst->addr, addr); 206 207 if (ifindex == 0) { 208 struct rt6_info *rt; 209 rt = rt6_lookup(net, addr, NULL, 0, 0); 210 if (rt) { 211 dev = rt->rt6i_dev; 212 dev_hold(dev); 213 dst_release(&rt->u.dst); 214 } 215 } else 216 dev = dev_get_by_index(net, ifindex); 217 218 if (dev == NULL) { 219 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 220 return -ENODEV; 221 } 222 223 mc_lst->ifindex = dev->ifindex; 224 mc_lst->sfmode = MCAST_EXCLUDE; 225 rwlock_init(&mc_lst->sflock); 226 mc_lst->sflist = NULL; 227 228 /* 229 * now add/increase the group membership on the device 230 */ 231 232 err = ipv6_dev_mc_inc(dev, addr); 233 234 if (err) { 235 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 236 dev_put(dev); 237 return err; 238 } 239 240 write_lock_bh(&ipv6_sk_mc_lock); 241 mc_lst->next = np->ipv6_mc_list; 242 np->ipv6_mc_list = mc_lst; 243 write_unlock_bh(&ipv6_sk_mc_lock); 244 245 dev_put(dev); 246 247 return 0; 248 } 249 250 /* 251 * socket leave on multicast group 252 */ 253 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) 254 { 255 struct ipv6_pinfo *np = inet6_sk(sk); 256 struct ipv6_mc_socklist *mc_lst, **lnk; 257 struct net *net = sock_net(sk); 258 259 write_lock_bh(&ipv6_sk_mc_lock); 260 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { 261 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 262 ipv6_addr_equal(&mc_lst->addr, addr)) { 263 struct net_device *dev; 264 265 *lnk = mc_lst->next; 266 write_unlock_bh(&ipv6_sk_mc_lock); 267 268 dev = dev_get_by_index(net, mc_lst->ifindex); 269 if (dev != 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 net *net, 290 struct in6_addr *group, 291 int ifindex) 292 { 293 struct net_device *dev = NULL; 294 struct inet6_dev *idev = NULL; 295 296 if (ifindex == 0) { 297 struct rt6_info *rt; 298 299 rt = rt6_lookup(net, group, NULL, 0, 0); 300 if (rt) { 301 dev = rt->rt6i_dev; 302 dev_hold(dev); 303 dst_release(&rt->u.dst); 304 } 305 } else 306 dev = dev_get_by_index(net, ifindex); 307 308 if (!dev) 309 return NULL; 310 idev = in6_dev_get(dev); 311 if (!idev) { 312 dev_put(dev); 313 return NULL; 314 } 315 read_lock_bh(&idev->lock); 316 if (idev->dead) { 317 read_unlock_bh(&idev->lock); 318 in6_dev_put(idev); 319 dev_put(dev); 320 return NULL; 321 } 322 return idev; 323 } 324 325 void ipv6_sock_mc_close(struct sock *sk) 326 { 327 struct ipv6_pinfo *np = inet6_sk(sk); 328 struct ipv6_mc_socklist *mc_lst; 329 struct net *net = sock_net(sk); 330 331 write_lock_bh(&ipv6_sk_mc_lock); 332 while ((mc_lst = np->ipv6_mc_list) != NULL) { 333 struct net_device *dev; 334 335 np->ipv6_mc_list = mc_lst->next; 336 write_unlock_bh(&ipv6_sk_mc_lock); 337 338 dev = dev_get_by_index(net, mc_lst->ifindex); 339 if (dev) { 340 struct inet6_dev *idev = in6_dev_get(dev); 341 342 (void) ip6_mc_leave_src(sk, mc_lst, idev); 343 if (idev) { 344 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 345 in6_dev_put(idev); 346 } 347 dev_put(dev); 348 } else 349 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 350 351 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 352 353 write_lock_bh(&ipv6_sk_mc_lock); 354 } 355 write_unlock_bh(&ipv6_sk_mc_lock); 356 } 357 358 int ip6_mc_source(int add, int omode, struct sock *sk, 359 struct group_source_req *pgsr) 360 { 361 struct in6_addr *source, *group; 362 struct ipv6_mc_socklist *pmc; 363 struct net_device *dev; 364 struct inet6_dev *idev; 365 struct ipv6_pinfo *inet6 = inet6_sk(sk); 366 struct ip6_sf_socklist *psl; 367 struct net *net = sock_net(sk); 368 int i, j, rv; 369 int leavegroup = 0; 370 int pmclocked = 0; 371 int err; 372 373 if (pgsr->gsr_group.ss_family != AF_INET6 || 374 pgsr->gsr_source.ss_family != AF_INET6) 375 return -EINVAL; 376 377 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 378 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 379 380 if (!ipv6_addr_is_multicast(group)) 381 return -EINVAL; 382 383 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface); 384 if (!idev) 385 return -ENODEV; 386 dev = idev->dev; 387 388 err = -EADDRNOTAVAIL; 389 390 read_lock_bh(&ipv6_sk_mc_lock); 391 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 392 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 393 continue; 394 if (ipv6_addr_equal(&pmc->addr, group)) 395 break; 396 } 397 if (!pmc) { /* must have a prior join */ 398 err = -EINVAL; 399 goto done; 400 } 401 /* if a source filter was set, must be the same mode as before */ 402 if (pmc->sflist) { 403 if (pmc->sfmode != omode) { 404 err = -EINVAL; 405 goto done; 406 } 407 } else if (pmc->sfmode != omode) { 408 /* allow mode switches for empty-set filters */ 409 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 410 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 411 pmc->sfmode = omode; 412 } 413 414 write_lock_bh(&pmc->sflock); 415 pmclocked = 1; 416 417 psl = pmc->sflist; 418 if (!add) { 419 if (!psl) 420 goto done; /* err = -EADDRNOTAVAIL */ 421 rv = !0; 422 for (i=0; i<psl->sl_count; i++) { 423 rv = memcmp(&psl->sl_addr[i], source, 424 sizeof(struct in6_addr)); 425 if (rv == 0) 426 break; 427 } 428 if (rv) /* source not found */ 429 goto done; /* err = -EADDRNOTAVAIL */ 430 431 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 432 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 433 leavegroup = 1; 434 goto done; 435 } 436 437 /* update the interface filter */ 438 ip6_mc_del_src(idev, group, omode, 1, source, 1); 439 440 for (j=i+1; j<psl->sl_count; j++) 441 psl->sl_addr[j-1] = psl->sl_addr[j]; 442 psl->sl_count--; 443 err = 0; 444 goto done; 445 } 446 /* else, add a new source to the filter */ 447 448 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 449 err = -ENOBUFS; 450 goto done; 451 } 452 if (!psl || psl->sl_count == psl->sl_max) { 453 struct ip6_sf_socklist *newpsl; 454 int count = IP6_SFBLOCK; 455 456 if (psl) 457 count += psl->sl_max; 458 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 459 if (!newpsl) { 460 err = -ENOBUFS; 461 goto done; 462 } 463 newpsl->sl_max = count; 464 newpsl->sl_count = count - IP6_SFBLOCK; 465 if (psl) { 466 for (i=0; i<psl->sl_count; i++) 467 newpsl->sl_addr[i] = psl->sl_addr[i]; 468 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 469 } 470 pmc->sflist = psl = newpsl; 471 } 472 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 473 for (i=0; i<psl->sl_count; i++) { 474 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 475 if (rv == 0) 476 break; 477 } 478 if (rv == 0) /* address already there is an error */ 479 goto done; 480 for (j=psl->sl_count-1; j>=i; j--) 481 psl->sl_addr[j+1] = psl->sl_addr[j]; 482 psl->sl_addr[i] = *source; 483 psl->sl_count++; 484 err = 0; 485 /* update the interface list */ 486 ip6_mc_add_src(idev, group, omode, 1, source, 1); 487 done: 488 if (pmclocked) 489 write_unlock_bh(&pmc->sflock); 490 read_unlock_bh(&ipv6_sk_mc_lock); 491 read_unlock_bh(&idev->lock); 492 in6_dev_put(idev); 493 dev_put(dev); 494 if (leavegroup) 495 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 496 return err; 497 } 498 499 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 500 { 501 struct in6_addr *group; 502 struct ipv6_mc_socklist *pmc; 503 struct net_device *dev; 504 struct inet6_dev *idev; 505 struct ipv6_pinfo *inet6 = inet6_sk(sk); 506 struct ip6_sf_socklist *newpsl, *psl; 507 struct net *net = sock_net(sk); 508 int leavegroup = 0; 509 int i, err; 510 511 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 512 513 if (!ipv6_addr_is_multicast(group)) 514 return -EINVAL; 515 if (gsf->gf_fmode != MCAST_INCLUDE && 516 gsf->gf_fmode != MCAST_EXCLUDE) 517 return -EINVAL; 518 519 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 520 521 if (!idev) 522 return -ENODEV; 523 dev = idev->dev; 524 525 err = 0; 526 read_lock_bh(&ipv6_sk_mc_lock); 527 528 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 529 leavegroup = 1; 530 goto done; 531 } 532 533 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 534 if (pmc->ifindex != gsf->gf_interface) 535 continue; 536 if (ipv6_addr_equal(&pmc->addr, group)) 537 break; 538 } 539 if (!pmc) { /* must have a prior join */ 540 err = -EINVAL; 541 goto done; 542 } 543 if (gsf->gf_numsrc) { 544 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 545 GFP_ATOMIC); 546 if (!newpsl) { 547 err = -ENOBUFS; 548 goto done; 549 } 550 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 551 for (i=0; i<newpsl->sl_count; ++i) { 552 struct sockaddr_in6 *psin6; 553 554 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 555 newpsl->sl_addr[i] = psin6->sin6_addr; 556 } 557 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 558 newpsl->sl_count, newpsl->sl_addr, 0); 559 if (err) { 560 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 561 goto done; 562 } 563 } else { 564 newpsl = NULL; 565 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 566 } 567 568 write_lock_bh(&pmc->sflock); 569 psl = pmc->sflist; 570 if (psl) { 571 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 572 psl->sl_count, psl->sl_addr, 0); 573 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 574 } else 575 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 576 pmc->sflist = newpsl; 577 pmc->sfmode = gsf->gf_fmode; 578 write_unlock_bh(&pmc->sflock); 579 err = 0; 580 done: 581 read_unlock_bh(&ipv6_sk_mc_lock); 582 read_unlock_bh(&idev->lock); 583 in6_dev_put(idev); 584 dev_put(dev); 585 if (leavegroup) 586 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 587 return err; 588 } 589 590 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 591 struct group_filter __user *optval, int __user *optlen) 592 { 593 int err, i, count, copycount; 594 struct in6_addr *group; 595 struct ipv6_mc_socklist *pmc; 596 struct inet6_dev *idev; 597 struct net_device *dev; 598 struct ipv6_pinfo *inet6 = inet6_sk(sk); 599 struct ip6_sf_socklist *psl; 600 struct net *net = sock_net(sk); 601 602 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 603 604 if (!ipv6_addr_is_multicast(group)) 605 return -EINVAL; 606 607 idev = ip6_mc_find_dev(net, group, gsf->gf_interface); 608 609 if (!idev) 610 return -ENODEV; 611 612 dev = idev->dev; 613 614 err = -EADDRNOTAVAIL; 615 /* 616 * changes to the ipv6_mc_list require the socket lock and 617 * a read lock on ip6_sk_mc_lock. We have the socket lock, 618 * so reading the list is safe. 619 */ 620 621 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 622 if (pmc->ifindex != gsf->gf_interface) 623 continue; 624 if (ipv6_addr_equal(group, &pmc->addr)) 625 break; 626 } 627 if (!pmc) /* must have a prior join */ 628 goto done; 629 gsf->gf_fmode = pmc->sfmode; 630 psl = pmc->sflist; 631 count = psl ? psl->sl_count : 0; 632 read_unlock_bh(&idev->lock); 633 in6_dev_put(idev); 634 dev_put(dev); 635 636 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 637 gsf->gf_numsrc = count; 638 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 639 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 640 return -EFAULT; 641 } 642 /* changes to psl require the socket lock, a read lock on 643 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 644 * have the socket lock, so reading here is safe. 645 */ 646 for (i=0; i<copycount; i++) { 647 struct sockaddr_in6 *psin6; 648 struct sockaddr_storage ss; 649 650 psin6 = (struct sockaddr_in6 *)&ss; 651 memset(&ss, 0, sizeof(ss)); 652 psin6->sin6_family = AF_INET6; 653 psin6->sin6_addr = psl->sl_addr[i]; 654 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 655 return -EFAULT; 656 } 657 return 0; 658 done: 659 read_unlock_bh(&idev->lock); 660 in6_dev_put(idev); 661 dev_put(dev); 662 return err; 663 } 664 665 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, 666 const struct in6_addr *src_addr) 667 { 668 struct ipv6_pinfo *np = inet6_sk(sk); 669 struct ipv6_mc_socklist *mc; 670 struct ip6_sf_socklist *psl; 671 int rv = 1; 672 673 read_lock(&ipv6_sk_mc_lock); 674 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 675 if (ipv6_addr_equal(&mc->addr, mc_addr)) 676 break; 677 } 678 if (!mc) { 679 read_unlock(&ipv6_sk_mc_lock); 680 return 1; 681 } 682 read_lock(&mc->sflock); 683 psl = mc->sflist; 684 if (!psl) { 685 rv = mc->sfmode == MCAST_EXCLUDE; 686 } else { 687 int i; 688 689 for (i=0; i<psl->sl_count; i++) { 690 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 691 break; 692 } 693 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 694 rv = 0; 695 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 696 rv = 0; 697 } 698 read_unlock(&mc->sflock); 699 read_unlock(&ipv6_sk_mc_lock); 700 701 return rv; 702 } 703 704 static void ma_put(struct ifmcaddr6 *mc) 705 { 706 if (atomic_dec_and_test(&mc->mca_refcnt)) { 707 in6_dev_put(mc->idev); 708 kfree(mc); 709 } 710 } 711 712 static void igmp6_group_added(struct ifmcaddr6 *mc) 713 { 714 struct net_device *dev = mc->idev->dev; 715 char buf[MAX_ADDR_LEN]; 716 717 spin_lock_bh(&mc->mca_lock); 718 if (!(mc->mca_flags&MAF_LOADED)) { 719 mc->mca_flags |= MAF_LOADED; 720 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 721 dev_mc_add(dev, buf, dev->addr_len, 0); 722 } 723 spin_unlock_bh(&mc->mca_lock); 724 725 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 726 return; 727 728 if (MLD_V1_SEEN(mc->idev)) { 729 igmp6_join_group(mc); 730 return; 731 } 732 /* else v2 */ 733 734 mc->mca_crcount = mc->idev->mc_qrv; 735 mld_ifc_event(mc->idev); 736 } 737 738 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 739 { 740 struct net_device *dev = mc->idev->dev; 741 char buf[MAX_ADDR_LEN]; 742 743 spin_lock_bh(&mc->mca_lock); 744 if (mc->mca_flags&MAF_LOADED) { 745 mc->mca_flags &= ~MAF_LOADED; 746 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 747 dev_mc_delete(dev, buf, dev->addr_len, 0); 748 } 749 750 if (mc->mca_flags & MAF_NOREPORT) 751 goto done; 752 spin_unlock_bh(&mc->mca_lock); 753 754 if (!mc->idev->dead) 755 igmp6_leave_group(mc); 756 757 spin_lock_bh(&mc->mca_lock); 758 if (del_timer(&mc->mca_timer)) 759 atomic_dec(&mc->mca_refcnt); 760 done: 761 ip6_mc_clear_src(mc); 762 spin_unlock_bh(&mc->mca_lock); 763 } 764 765 /* 766 * deleted ifmcaddr6 manipulation 767 */ 768 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 769 { 770 struct ifmcaddr6 *pmc; 771 772 /* this is an "ifmcaddr6" for convenience; only the fields below 773 * are actually used. In particular, the refcnt and users are not 774 * used for management of the delete list. Using the same structure 775 * for deleted items allows change reports to use common code with 776 * non-deleted or query-response MCA's. 777 */ 778 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 779 if (!pmc) 780 return; 781 782 spin_lock_bh(&im->mca_lock); 783 spin_lock_init(&pmc->mca_lock); 784 pmc->idev = im->idev; 785 in6_dev_hold(idev); 786 pmc->mca_addr = im->mca_addr; 787 pmc->mca_crcount = idev->mc_qrv; 788 pmc->mca_sfmode = im->mca_sfmode; 789 if (pmc->mca_sfmode == MCAST_INCLUDE) { 790 struct ip6_sf_list *psf; 791 792 pmc->mca_tomb = im->mca_tomb; 793 pmc->mca_sources = im->mca_sources; 794 im->mca_tomb = im->mca_sources = NULL; 795 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 796 psf->sf_crcount = pmc->mca_crcount; 797 } 798 spin_unlock_bh(&im->mca_lock); 799 800 write_lock_bh(&idev->mc_lock); 801 pmc->next = idev->mc_tomb; 802 idev->mc_tomb = pmc; 803 write_unlock_bh(&idev->mc_lock); 804 } 805 806 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 807 { 808 struct ifmcaddr6 *pmc, *pmc_prev; 809 struct ip6_sf_list *psf, *psf_next; 810 811 write_lock_bh(&idev->mc_lock); 812 pmc_prev = NULL; 813 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 814 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 815 break; 816 pmc_prev = pmc; 817 } 818 if (pmc) { 819 if (pmc_prev) 820 pmc_prev->next = pmc->next; 821 else 822 idev->mc_tomb = pmc->next; 823 } 824 write_unlock_bh(&idev->mc_lock); 825 if (pmc) { 826 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 827 psf_next = psf->sf_next; 828 kfree(psf); 829 } 830 in6_dev_put(pmc->idev); 831 kfree(pmc); 832 } 833 } 834 835 static void mld_clear_delrec(struct inet6_dev *idev) 836 { 837 struct ifmcaddr6 *pmc, *nextpmc; 838 839 write_lock_bh(&idev->mc_lock); 840 pmc = idev->mc_tomb; 841 idev->mc_tomb = NULL; 842 write_unlock_bh(&idev->mc_lock); 843 844 for (; pmc; pmc = nextpmc) { 845 nextpmc = pmc->next; 846 ip6_mc_clear_src(pmc); 847 in6_dev_put(pmc->idev); 848 kfree(pmc); 849 } 850 851 /* clear dead sources, too */ 852 read_lock_bh(&idev->lock); 853 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 854 struct ip6_sf_list *psf, *psf_next; 855 856 spin_lock_bh(&pmc->mca_lock); 857 psf = pmc->mca_tomb; 858 pmc->mca_tomb = NULL; 859 spin_unlock_bh(&pmc->mca_lock); 860 for (; psf; psf=psf_next) { 861 psf_next = psf->sf_next; 862 kfree(psf); 863 } 864 } 865 read_unlock_bh(&idev->lock); 866 } 867 868 869 /* 870 * device multicast group inc (add if not found) 871 */ 872 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) 873 { 874 struct ifmcaddr6 *mc; 875 struct inet6_dev *idev; 876 877 idev = in6_dev_get(dev); 878 879 if (idev == NULL) 880 return -EINVAL; 881 882 write_lock_bh(&idev->lock); 883 if (idev->dead) { 884 write_unlock_bh(&idev->lock); 885 in6_dev_put(idev); 886 return -ENODEV; 887 } 888 889 for (mc = idev->mc_list; mc; mc = mc->next) { 890 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 891 mc->mca_users++; 892 write_unlock_bh(&idev->lock); 893 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 894 NULL, 0); 895 in6_dev_put(idev); 896 return 0; 897 } 898 } 899 900 /* 901 * not found: create a new one. 902 */ 903 904 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 905 906 if (mc == NULL) { 907 write_unlock_bh(&idev->lock); 908 in6_dev_put(idev); 909 return -ENOMEM; 910 } 911 912 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); 913 914 ipv6_addr_copy(&mc->mca_addr, addr); 915 mc->idev = idev; 916 mc->mca_users = 1; 917 /* mca_stamp should be updated upon changes */ 918 mc->mca_cstamp = mc->mca_tstamp = jiffies; 919 atomic_set(&mc->mca_refcnt, 2); 920 spin_lock_init(&mc->mca_lock); 921 922 /* initial mode is (EX, empty) */ 923 mc->mca_sfmode = MCAST_EXCLUDE; 924 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 925 926 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 927 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 928 mc->mca_flags |= MAF_NOREPORT; 929 930 mc->next = idev->mc_list; 931 idev->mc_list = mc; 932 write_unlock_bh(&idev->lock); 933 934 mld_del_delrec(idev, &mc->mca_addr); 935 igmp6_group_added(mc); 936 ma_put(mc); 937 return 0; 938 } 939 940 /* 941 * device multicast group del 942 */ 943 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) 944 { 945 struct ifmcaddr6 *ma, **map; 946 947 write_lock_bh(&idev->lock); 948 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 949 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 950 if (--ma->mca_users == 0) { 951 *map = ma->next; 952 write_unlock_bh(&idev->lock); 953 954 igmp6_group_dropped(ma); 955 956 ma_put(ma); 957 return 0; 958 } 959 write_unlock_bh(&idev->lock); 960 return 0; 961 } 962 } 963 write_unlock_bh(&idev->lock); 964 965 return -ENOENT; 966 } 967 968 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) 969 { 970 struct inet6_dev *idev = in6_dev_get(dev); 971 int err; 972 973 if (!idev) 974 return -ENODEV; 975 976 err = __ipv6_dev_mc_dec(idev, addr); 977 978 in6_dev_put(idev); 979 980 return err; 981 } 982 983 /* 984 * identify MLD packets for MLD filter exceptions 985 */ 986 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 987 { 988 struct icmp6hdr *pic; 989 990 if (nexthdr != IPPROTO_ICMPV6) 991 return 0; 992 993 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 994 return 0; 995 996 pic = icmp6_hdr(skb); 997 998 switch (pic->icmp6_type) { 999 case ICMPV6_MGM_QUERY: 1000 case ICMPV6_MGM_REPORT: 1001 case ICMPV6_MGM_REDUCTION: 1002 case ICMPV6_MLD2_REPORT: 1003 return 1; 1004 default: 1005 break; 1006 } 1007 return 0; 1008 } 1009 1010 /* 1011 * check if the interface/address pair is valid 1012 */ 1013 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, 1014 const struct in6_addr *src_addr) 1015 { 1016 struct inet6_dev *idev; 1017 struct ifmcaddr6 *mc; 1018 int rv = 0; 1019 1020 idev = in6_dev_get(dev); 1021 if (idev) { 1022 read_lock_bh(&idev->lock); 1023 for (mc = idev->mc_list; mc; mc=mc->next) { 1024 if (ipv6_addr_equal(&mc->mca_addr, group)) 1025 break; 1026 } 1027 if (mc) { 1028 if (src_addr && !ipv6_addr_any(src_addr)) { 1029 struct ip6_sf_list *psf; 1030 1031 spin_lock_bh(&mc->mca_lock); 1032 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1034 break; 1035 } 1036 if (psf) 1037 rv = psf->sf_count[MCAST_INCLUDE] || 1038 psf->sf_count[MCAST_EXCLUDE] != 1039 mc->mca_sfcount[MCAST_EXCLUDE]; 1040 else 1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1042 spin_unlock_bh(&mc->mca_lock); 1043 } else 1044 rv = 1; /* don't filter unspecified source */ 1045 } 1046 read_unlock_bh(&idev->lock); 1047 in6_dev_put(idev); 1048 } 1049 return rv; 1050 } 1051 1052 static void mld_gq_start_timer(struct inet6_dev *idev) 1053 { 1054 int tv = net_random() % idev->mc_maxdelay; 1055 1056 idev->mc_gq_running = 1; 1057 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1058 in6_dev_hold(idev); 1059 } 1060 1061 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1062 { 1063 int tv = net_random() % delay; 1064 1065 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1066 in6_dev_hold(idev); 1067 } 1068 1069 /* 1070 * IGMP handling (alias multicast ICMPv6 messages) 1071 */ 1072 1073 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1074 { 1075 unsigned long delay = resptime; 1076 1077 /* Do not start timer for these addresses */ 1078 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1079 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1080 return; 1081 1082 if (del_timer(&ma->mca_timer)) { 1083 atomic_dec(&ma->mca_refcnt); 1084 delay = ma->mca_timer.expires - jiffies; 1085 } 1086 1087 if (delay >= resptime) { 1088 if (resptime) 1089 delay = net_random() % resptime; 1090 else 1091 delay = 1; 1092 } 1093 ma->mca_timer.expires = jiffies + delay; 1094 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1095 atomic_inc(&ma->mca_refcnt); 1096 ma->mca_flags |= MAF_TIMER_RUNNING; 1097 } 1098 1099 /* mark EXCLUDE-mode sources */ 1100 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1101 struct in6_addr *srcs) 1102 { 1103 struct ip6_sf_list *psf; 1104 int i, scount; 1105 1106 scount = 0; 1107 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1108 if (scount == nsrcs) 1109 break; 1110 for (i=0; i<nsrcs; i++) { 1111 /* skip inactive filters */ 1112 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1113 pmc->mca_sfcount[MCAST_EXCLUDE] != 1114 psf->sf_count[MCAST_EXCLUDE]) 1115 continue; 1116 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1117 scount++; 1118 break; 1119 } 1120 } 1121 } 1122 pmc->mca_flags &= ~MAF_GSQUERY; 1123 if (scount == nsrcs) /* all sources excluded */ 1124 return 0; 1125 return 1; 1126 } 1127 1128 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1129 struct in6_addr *srcs) 1130 { 1131 struct ip6_sf_list *psf; 1132 int i, scount; 1133 1134 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1135 return mld_xmarksources(pmc, nsrcs, srcs); 1136 1137 /* mark INCLUDE-mode sources */ 1138 1139 scount = 0; 1140 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1141 if (scount == nsrcs) 1142 break; 1143 for (i=0; i<nsrcs; i++) { 1144 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1145 psf->sf_gsresp = 1; 1146 scount++; 1147 break; 1148 } 1149 } 1150 } 1151 if (!scount) { 1152 pmc->mca_flags &= ~MAF_GSQUERY; 1153 return 0; 1154 } 1155 pmc->mca_flags |= MAF_GSQUERY; 1156 return 1; 1157 } 1158 1159 int igmp6_event_query(struct sk_buff *skb) 1160 { 1161 struct mld2_query *mlh2 = NULL; 1162 struct ifmcaddr6 *ma; 1163 struct in6_addr *group; 1164 unsigned long max_delay; 1165 struct inet6_dev *idev; 1166 struct icmp6hdr *hdr; 1167 int group_type; 1168 int mark = 0; 1169 int len; 1170 1171 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1172 return -EINVAL; 1173 1174 /* compute payload length excluding extension headers */ 1175 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1176 len -= skb_network_header_len(skb); 1177 1178 /* Drop queries with not link local source */ 1179 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1180 return -EINVAL; 1181 1182 idev = in6_dev_get(skb->dev); 1183 1184 if (idev == NULL) 1185 return 0; 1186 1187 hdr = icmp6_hdr(skb); 1188 group = (struct in6_addr *) (hdr + 1); 1189 group_type = ipv6_addr_type(group); 1190 1191 if (group_type != IPV6_ADDR_ANY && 1192 !(group_type&IPV6_ADDR_MULTICAST)) { 1193 in6_dev_put(idev); 1194 return -EINVAL; 1195 } 1196 1197 if (len == 24) { 1198 int switchback; 1199 /* MLDv1 router present */ 1200 1201 /* Translate milliseconds to jiffies */ 1202 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1203 1204 switchback = (idev->mc_qrv + 1) * max_delay; 1205 idev->mc_v1_seen = jiffies + switchback; 1206 1207 /* cancel the interface change timer */ 1208 idev->mc_ifc_count = 0; 1209 if (del_timer(&idev->mc_ifc_timer)) 1210 __in6_dev_put(idev); 1211 /* clear deleted report items */ 1212 mld_clear_delrec(idev); 1213 } else if (len >= 28) { 1214 int srcs_offset = sizeof(struct mld2_query) - 1215 sizeof(struct icmp6hdr); 1216 if (!pskb_may_pull(skb, srcs_offset)) { 1217 in6_dev_put(idev); 1218 return -EINVAL; 1219 } 1220 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1221 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1222 if (!max_delay) 1223 max_delay = 1; 1224 idev->mc_maxdelay = max_delay; 1225 if (mlh2->qrv) 1226 idev->mc_qrv = mlh2->qrv; 1227 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1228 if (mlh2->nsrcs) { 1229 in6_dev_put(idev); 1230 return -EINVAL; /* no sources allowed */ 1231 } 1232 mld_gq_start_timer(idev); 1233 in6_dev_put(idev); 1234 return 0; 1235 } 1236 /* mark sources to include, if group & source-specific */ 1237 if (mlh2->nsrcs != 0) { 1238 if (!pskb_may_pull(skb, srcs_offset + 1239 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1240 in6_dev_put(idev); 1241 return -EINVAL; 1242 } 1243 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1244 mark = 1; 1245 } 1246 } else { 1247 in6_dev_put(idev); 1248 return -EINVAL; 1249 } 1250 1251 read_lock_bh(&idev->lock); 1252 if (group_type == IPV6_ADDR_ANY) { 1253 for (ma = idev->mc_list; ma; ma=ma->next) { 1254 spin_lock_bh(&ma->mca_lock); 1255 igmp6_group_queried(ma, max_delay); 1256 spin_unlock_bh(&ma->mca_lock); 1257 } 1258 } else { 1259 for (ma = idev->mc_list; ma; ma=ma->next) { 1260 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1261 continue; 1262 spin_lock_bh(&ma->mca_lock); 1263 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1264 /* gsquery <- gsquery && mark */ 1265 if (!mark) 1266 ma->mca_flags &= ~MAF_GSQUERY; 1267 } else { 1268 /* gsquery <- mark */ 1269 if (mark) 1270 ma->mca_flags |= MAF_GSQUERY; 1271 else 1272 ma->mca_flags &= ~MAF_GSQUERY; 1273 } 1274 if (!(ma->mca_flags & MAF_GSQUERY) || 1275 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1276 igmp6_group_queried(ma, max_delay); 1277 spin_unlock_bh(&ma->mca_lock); 1278 break; 1279 } 1280 } 1281 read_unlock_bh(&idev->lock); 1282 in6_dev_put(idev); 1283 1284 return 0; 1285 } 1286 1287 1288 int igmp6_event_report(struct sk_buff *skb) 1289 { 1290 struct ifmcaddr6 *ma; 1291 struct in6_addr *addrp; 1292 struct inet6_dev *idev; 1293 struct icmp6hdr *hdr; 1294 int addr_type; 1295 1296 /* Our own report looped back. Ignore it. */ 1297 if (skb->pkt_type == PACKET_LOOPBACK) 1298 return 0; 1299 1300 /* send our report if the MC router may not have heard this report */ 1301 if (skb->pkt_type != PACKET_MULTICAST && 1302 skb->pkt_type != PACKET_BROADCAST) 1303 return 0; 1304 1305 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1306 return -EINVAL; 1307 1308 hdr = icmp6_hdr(skb); 1309 1310 /* Drop reports with not link local source */ 1311 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1312 if (addr_type != IPV6_ADDR_ANY && 1313 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1314 return -EINVAL; 1315 1316 addrp = (struct in6_addr *) (hdr + 1); 1317 1318 idev = in6_dev_get(skb->dev); 1319 if (idev == NULL) 1320 return -ENODEV; 1321 1322 /* 1323 * Cancel the timer for this group 1324 */ 1325 1326 read_lock_bh(&idev->lock); 1327 for (ma = idev->mc_list; ma; ma=ma->next) { 1328 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1329 spin_lock(&ma->mca_lock); 1330 if (del_timer(&ma->mca_timer)) 1331 atomic_dec(&ma->mca_refcnt); 1332 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1333 spin_unlock(&ma->mca_lock); 1334 break; 1335 } 1336 } 1337 read_unlock_bh(&idev->lock); 1338 in6_dev_put(idev); 1339 return 0; 1340 } 1341 1342 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1343 int gdeleted, int sdeleted) 1344 { 1345 switch (type) { 1346 case MLD2_MODE_IS_INCLUDE: 1347 case MLD2_MODE_IS_EXCLUDE: 1348 if (gdeleted || sdeleted) 1349 return 0; 1350 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1351 if (pmc->mca_sfmode == MCAST_INCLUDE) 1352 return 1; 1353 /* don't include if this source is excluded 1354 * in all filters 1355 */ 1356 if (psf->sf_count[MCAST_INCLUDE]) 1357 return type == MLD2_MODE_IS_INCLUDE; 1358 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1359 psf->sf_count[MCAST_EXCLUDE]; 1360 } 1361 return 0; 1362 case MLD2_CHANGE_TO_INCLUDE: 1363 if (gdeleted || sdeleted) 1364 return 0; 1365 return psf->sf_count[MCAST_INCLUDE] != 0; 1366 case MLD2_CHANGE_TO_EXCLUDE: 1367 if (gdeleted || sdeleted) 1368 return 0; 1369 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1370 psf->sf_count[MCAST_INCLUDE]) 1371 return 0; 1372 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1373 psf->sf_count[MCAST_EXCLUDE]; 1374 case MLD2_ALLOW_NEW_SOURCES: 1375 if (gdeleted || !psf->sf_crcount) 1376 return 0; 1377 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1378 case MLD2_BLOCK_OLD_SOURCES: 1379 if (pmc->mca_sfmode == MCAST_INCLUDE) 1380 return gdeleted || (psf->sf_crcount && sdeleted); 1381 return psf->sf_crcount && !gdeleted && !sdeleted; 1382 } 1383 return 0; 1384 } 1385 1386 static int 1387 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1388 { 1389 struct ip6_sf_list *psf; 1390 int scount = 0; 1391 1392 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1393 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1394 continue; 1395 scount++; 1396 } 1397 return scount; 1398 } 1399 1400 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1401 { 1402 struct net *net = dev_net(dev); 1403 struct sock *sk = net->ipv6.igmp_sk; 1404 struct sk_buff *skb; 1405 struct mld2_report *pmr; 1406 struct in6_addr addr_buf; 1407 int err; 1408 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1409 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1410 IPV6_TLV_PADN, 0 }; 1411 1412 /* we assume size > sizeof(ra) here */ 1413 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1414 1415 if (!skb) 1416 return NULL; 1417 1418 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1419 1420 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1421 /* <draft-ietf-magma-mld-source-05.txt>: 1422 * use unspecified address as the source address 1423 * when a valid link-local address is not available. 1424 */ 1425 memset(&addr_buf, 0, sizeof(addr_buf)); 1426 } 1427 1428 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1429 1430 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1431 1432 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1433 skb_put(skb, sizeof(*pmr)); 1434 pmr = (struct mld2_report *)skb_transport_header(skb); 1435 pmr->type = ICMPV6_MLD2_REPORT; 1436 pmr->resv1 = 0; 1437 pmr->csum = 0; 1438 pmr->resv2 = 0; 1439 pmr->ngrec = 0; 1440 return skb; 1441 } 1442 1443 static void mld_sendpack(struct sk_buff *skb) 1444 { 1445 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1446 struct mld2_report *pmr = 1447 (struct mld2_report *)skb_transport_header(skb); 1448 int payload_len, mldlen; 1449 struct inet6_dev *idev = in6_dev_get(skb->dev); 1450 struct net *net = dev_net(skb->dev); 1451 int err; 1452 struct flowi fl; 1453 1454 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); 1455 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1456 mldlen = skb->tail - skb->transport_header; 1457 pip6->payload_len = htons(payload_len); 1458 1459 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1460 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), 1461 mldlen, 0)); 1462 1463 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1464 1465 if (!skb->dst) { 1466 err = -ENOMEM; 1467 goto err_out; 1468 } 1469 1470 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT, 1471 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1472 skb->dev->ifindex); 1473 1474 err = xfrm_lookup(&skb->dst, &fl, NULL, 0); 1475 if (err) 1476 goto err_out; 1477 1478 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1479 dst_output); 1480 out: 1481 if (!err) { 1482 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT); 1483 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); 1484 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS); 1485 } else 1486 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS); 1487 1488 if (likely(idev != NULL)) 1489 in6_dev_put(idev); 1490 return; 1491 1492 err_out: 1493 kfree_skb(skb); 1494 goto out; 1495 } 1496 1497 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1498 { 1499 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1500 } 1501 1502 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1503 int type, struct mld2_grec **ppgr) 1504 { 1505 struct net_device *dev = pmc->idev->dev; 1506 struct mld2_report *pmr; 1507 struct mld2_grec *pgr; 1508 1509 if (!skb) 1510 skb = mld_newpack(dev, dev->mtu); 1511 if (!skb) 1512 return NULL; 1513 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1514 pgr->grec_type = type; 1515 pgr->grec_auxwords = 0; 1516 pgr->grec_nsrcs = 0; 1517 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1518 pmr = (struct mld2_report *)skb_transport_header(skb); 1519 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1520 *ppgr = pgr; 1521 return skb; 1522 } 1523 1524 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1525 skb_tailroom(skb)) : 0) 1526 1527 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1528 int type, int gdeleted, int sdeleted) 1529 { 1530 struct net_device *dev = pmc->idev->dev; 1531 struct mld2_report *pmr; 1532 struct mld2_grec *pgr = NULL; 1533 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1534 int scount, stotal, first, isquery, truncate; 1535 1536 if (pmc->mca_flags & MAF_NOREPORT) 1537 return skb; 1538 1539 isquery = type == MLD2_MODE_IS_INCLUDE || 1540 type == MLD2_MODE_IS_EXCLUDE; 1541 truncate = type == MLD2_MODE_IS_EXCLUDE || 1542 type == MLD2_CHANGE_TO_EXCLUDE; 1543 1544 stotal = scount = 0; 1545 1546 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1547 1548 if (!*psf_list) 1549 goto empty_source; 1550 1551 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1552 1553 /* EX and TO_EX get a fresh packet, if needed */ 1554 if (truncate) { 1555 if (pmr && pmr->ngrec && 1556 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1557 if (skb) 1558 mld_sendpack(skb); 1559 skb = mld_newpack(dev, dev->mtu); 1560 } 1561 } 1562 first = 1; 1563 psf_prev = NULL; 1564 for (psf=*psf_list; psf; psf=psf_next) { 1565 struct in6_addr *psrc; 1566 1567 psf_next = psf->sf_next; 1568 1569 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1570 psf_prev = psf; 1571 continue; 1572 } 1573 1574 /* clear marks on query responses */ 1575 if (isquery) 1576 psf->sf_gsresp = 0; 1577 1578 if (AVAILABLE(skb) < sizeof(*psrc) + 1579 first*sizeof(struct mld2_grec)) { 1580 if (truncate && !first) 1581 break; /* truncate these */ 1582 if (pgr) 1583 pgr->grec_nsrcs = htons(scount); 1584 if (skb) 1585 mld_sendpack(skb); 1586 skb = mld_newpack(dev, dev->mtu); 1587 first = 1; 1588 scount = 0; 1589 } 1590 if (first) { 1591 skb = add_grhead(skb, pmc, type, &pgr); 1592 first = 0; 1593 } 1594 if (!skb) 1595 return NULL; 1596 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1597 *psrc = psf->sf_addr; 1598 scount++; stotal++; 1599 if ((type == MLD2_ALLOW_NEW_SOURCES || 1600 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1601 psf->sf_crcount--; 1602 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1603 if (psf_prev) 1604 psf_prev->sf_next = psf->sf_next; 1605 else 1606 *psf_list = psf->sf_next; 1607 kfree(psf); 1608 continue; 1609 } 1610 } 1611 psf_prev = psf; 1612 } 1613 1614 empty_source: 1615 if (!stotal) { 1616 if (type == MLD2_ALLOW_NEW_SOURCES || 1617 type == MLD2_BLOCK_OLD_SOURCES) 1618 return skb; 1619 if (pmc->mca_crcount || isquery) { 1620 /* make sure we have room for group header */ 1621 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1622 mld_sendpack(skb); 1623 skb = NULL; /* add_grhead will get a new one */ 1624 } 1625 skb = add_grhead(skb, pmc, type, &pgr); 1626 } 1627 } 1628 if (pgr) 1629 pgr->grec_nsrcs = htons(scount); 1630 1631 if (isquery) 1632 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1633 return skb; 1634 } 1635 1636 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1637 { 1638 struct sk_buff *skb = NULL; 1639 int type; 1640 1641 if (!pmc) { 1642 read_lock_bh(&idev->lock); 1643 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1644 if (pmc->mca_flags & MAF_NOREPORT) 1645 continue; 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 read_unlock_bh(&idev->lock); 1655 } else { 1656 spin_lock_bh(&pmc->mca_lock); 1657 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1658 type = MLD2_MODE_IS_EXCLUDE; 1659 else 1660 type = MLD2_MODE_IS_INCLUDE; 1661 skb = add_grec(skb, pmc, type, 0, 0); 1662 spin_unlock_bh(&pmc->mca_lock); 1663 } 1664 if (skb) 1665 mld_sendpack(skb); 1666 } 1667 1668 /* 1669 * remove zero-count source records from a source filter list 1670 */ 1671 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1672 { 1673 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1674 1675 psf_prev = NULL; 1676 for (psf=*ppsf; psf; psf = psf_next) { 1677 psf_next = psf->sf_next; 1678 if (psf->sf_crcount == 0) { 1679 if (psf_prev) 1680 psf_prev->sf_next = psf->sf_next; 1681 else 1682 *ppsf = psf->sf_next; 1683 kfree(psf); 1684 } else 1685 psf_prev = psf; 1686 } 1687 } 1688 1689 static void mld_send_cr(struct inet6_dev *idev) 1690 { 1691 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1692 struct sk_buff *skb = NULL; 1693 int type, dtype; 1694 1695 read_lock_bh(&idev->lock); 1696 write_lock_bh(&idev->mc_lock); 1697 1698 /* deleted MCA's */ 1699 pmc_prev = NULL; 1700 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1701 pmc_next = pmc->next; 1702 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1703 type = MLD2_BLOCK_OLD_SOURCES; 1704 dtype = MLD2_BLOCK_OLD_SOURCES; 1705 skb = add_grec(skb, pmc, type, 1, 0); 1706 skb = add_grec(skb, pmc, dtype, 1, 1); 1707 } 1708 if (pmc->mca_crcount) { 1709 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1710 type = MLD2_CHANGE_TO_INCLUDE; 1711 skb = add_grec(skb, pmc, type, 1, 0); 1712 } 1713 pmc->mca_crcount--; 1714 if (pmc->mca_crcount == 0) { 1715 mld_clear_zeros(&pmc->mca_tomb); 1716 mld_clear_zeros(&pmc->mca_sources); 1717 } 1718 } 1719 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1720 !pmc->mca_sources) { 1721 if (pmc_prev) 1722 pmc_prev->next = pmc_next; 1723 else 1724 idev->mc_tomb = pmc_next; 1725 in6_dev_put(pmc->idev); 1726 kfree(pmc); 1727 } else 1728 pmc_prev = pmc; 1729 } 1730 write_unlock_bh(&idev->mc_lock); 1731 1732 /* change recs */ 1733 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1734 spin_lock_bh(&pmc->mca_lock); 1735 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1736 type = MLD2_BLOCK_OLD_SOURCES; 1737 dtype = MLD2_ALLOW_NEW_SOURCES; 1738 } else { 1739 type = MLD2_ALLOW_NEW_SOURCES; 1740 dtype = MLD2_BLOCK_OLD_SOURCES; 1741 } 1742 skb = add_grec(skb, pmc, type, 0, 0); 1743 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1744 1745 /* filter mode changes */ 1746 if (pmc->mca_crcount) { 1747 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1748 type = MLD2_CHANGE_TO_EXCLUDE; 1749 else 1750 type = MLD2_CHANGE_TO_INCLUDE; 1751 skb = add_grec(skb, pmc, type, 0, 0); 1752 pmc->mca_crcount--; 1753 } 1754 spin_unlock_bh(&pmc->mca_lock); 1755 } 1756 read_unlock_bh(&idev->lock); 1757 if (!skb) 1758 return; 1759 (void) mld_sendpack(skb); 1760 } 1761 1762 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1763 { 1764 struct net *net = dev_net(dev); 1765 struct sock *sk = net->ipv6.igmp_sk; 1766 struct inet6_dev *idev; 1767 struct sk_buff *skb; 1768 struct icmp6hdr *hdr; 1769 const struct in6_addr *snd_addr; 1770 struct in6_addr *addrp; 1771 struct in6_addr addr_buf; 1772 int err, len, payload_len, full_len; 1773 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1774 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1775 IPV6_TLV_PADN, 0 }; 1776 struct flowi fl; 1777 1778 rcu_read_lock(); 1779 IP6_INC_STATS(__in6_dev_get(dev), 1780 IPSTATS_MIB_OUTREQUESTS); 1781 rcu_read_unlock(); 1782 if (type == ICMPV6_MGM_REDUCTION) 1783 snd_addr = &in6addr_linklocal_allrouters; 1784 else 1785 snd_addr = addr; 1786 1787 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1788 payload_len = len + sizeof(ra); 1789 full_len = sizeof(struct ipv6hdr) + payload_len; 1790 1791 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1792 1793 if (skb == NULL) { 1794 rcu_read_lock(); 1795 IP6_INC_STATS(__in6_dev_get(dev), 1796 IPSTATS_MIB_OUTDISCARDS); 1797 rcu_read_unlock(); 1798 return; 1799 } 1800 1801 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1802 1803 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1804 /* <draft-ietf-magma-mld-source-05.txt>: 1805 * use unspecified address as the source address 1806 * when a valid link-local address is not available. 1807 */ 1808 memset(&addr_buf, 0, sizeof(addr_buf)); 1809 } 1810 1811 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1812 1813 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1814 1815 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1816 memset(hdr, 0, sizeof(struct icmp6hdr)); 1817 hdr->icmp6_type = type; 1818 1819 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1820 ipv6_addr_copy(addrp, addr); 1821 1822 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1823 IPPROTO_ICMPV6, 1824 csum_partial((__u8 *) hdr, len, 0)); 1825 1826 idev = in6_dev_get(skb->dev); 1827 1828 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr); 1829 if (!skb->dst) { 1830 err = -ENOMEM; 1831 goto err_out; 1832 } 1833 1834 icmpv6_flow_init(sk, &fl, type, 1835 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 1836 skb->dev->ifindex); 1837 1838 err = xfrm_lookup(&skb->dst, &fl, NULL, 0); 1839 if (err) 1840 goto err_out; 1841 1842 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, 1843 dst_output); 1844 out: 1845 if (!err) { 1846 ICMP6MSGOUT_INC_STATS(idev, type); 1847 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1848 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); 1849 } else 1850 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); 1851 1852 if (likely(idev != NULL)) 1853 in6_dev_put(idev); 1854 return; 1855 1856 err_out: 1857 kfree_skb(skb); 1858 goto out; 1859 } 1860 1861 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1862 struct in6_addr *psfsrc) 1863 { 1864 struct ip6_sf_list *psf, *psf_prev; 1865 int rv = 0; 1866 1867 psf_prev = NULL; 1868 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1869 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1870 break; 1871 psf_prev = psf; 1872 } 1873 if (!psf || psf->sf_count[sfmode] == 0) { 1874 /* source filter not found, or count wrong => bug */ 1875 return -ESRCH; 1876 } 1877 psf->sf_count[sfmode]--; 1878 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1879 struct inet6_dev *idev = pmc->idev; 1880 1881 /* no more filters for this source */ 1882 if (psf_prev) 1883 psf_prev->sf_next = psf->sf_next; 1884 else 1885 pmc->mca_sources = psf->sf_next; 1886 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1887 !MLD_V1_SEEN(idev)) { 1888 psf->sf_crcount = idev->mc_qrv; 1889 psf->sf_next = pmc->mca_tomb; 1890 pmc->mca_tomb = psf; 1891 rv = 1; 1892 } else 1893 kfree(psf); 1894 } 1895 return rv; 1896 } 1897 1898 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1899 int sfmode, int sfcount, struct in6_addr *psfsrc, 1900 int delta) 1901 { 1902 struct ifmcaddr6 *pmc; 1903 int changerec = 0; 1904 int i, err; 1905 1906 if (!idev) 1907 return -ENODEV; 1908 read_lock_bh(&idev->lock); 1909 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1910 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1911 break; 1912 } 1913 if (!pmc) { 1914 /* MCA not found?? bug */ 1915 read_unlock_bh(&idev->lock); 1916 return -ESRCH; 1917 } 1918 spin_lock_bh(&pmc->mca_lock); 1919 sf_markstate(pmc); 1920 if (!delta) { 1921 if (!pmc->mca_sfcount[sfmode]) { 1922 spin_unlock_bh(&pmc->mca_lock); 1923 read_unlock_bh(&idev->lock); 1924 return -EINVAL; 1925 } 1926 pmc->mca_sfcount[sfmode]--; 1927 } 1928 err = 0; 1929 for (i=0; i<sfcount; i++) { 1930 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1931 1932 changerec |= rv > 0; 1933 if (!err && rv < 0) 1934 err = rv; 1935 } 1936 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1937 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1938 pmc->mca_sfcount[MCAST_INCLUDE]) { 1939 struct ip6_sf_list *psf; 1940 1941 /* filter mode change */ 1942 pmc->mca_sfmode = MCAST_INCLUDE; 1943 pmc->mca_crcount = idev->mc_qrv; 1944 idev->mc_ifc_count = pmc->mca_crcount; 1945 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1946 psf->sf_crcount = 0; 1947 mld_ifc_event(pmc->idev); 1948 } else if (sf_setstate(pmc) || changerec) 1949 mld_ifc_event(pmc->idev); 1950 spin_unlock_bh(&pmc->mca_lock); 1951 read_unlock_bh(&idev->lock); 1952 return err; 1953 } 1954 1955 /* 1956 * Add multicast single-source filter to the interface list 1957 */ 1958 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1959 struct in6_addr *psfsrc, int delta) 1960 { 1961 struct ip6_sf_list *psf, *psf_prev; 1962 1963 psf_prev = NULL; 1964 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1965 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1966 break; 1967 psf_prev = psf; 1968 } 1969 if (!psf) { 1970 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1971 if (!psf) 1972 return -ENOBUFS; 1973 1974 psf->sf_addr = *psfsrc; 1975 if (psf_prev) { 1976 psf_prev->sf_next = psf; 1977 } else 1978 pmc->mca_sources = psf; 1979 } 1980 psf->sf_count[sfmode]++; 1981 return 0; 1982 } 1983 1984 static void sf_markstate(struct ifmcaddr6 *pmc) 1985 { 1986 struct ip6_sf_list *psf; 1987 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1988 1989 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1990 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1991 psf->sf_oldin = mca_xcount == 1992 psf->sf_count[MCAST_EXCLUDE] && 1993 !psf->sf_count[MCAST_INCLUDE]; 1994 } else 1995 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1996 } 1997 1998 static int sf_setstate(struct ifmcaddr6 *pmc) 1999 { 2000 struct ip6_sf_list *psf, *dpsf; 2001 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 2002 int qrv = pmc->idev->mc_qrv; 2003 int new_in, rv; 2004 2005 rv = 0; 2006 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 2007 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 2008 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2009 !psf->sf_count[MCAST_INCLUDE]; 2010 } else 2011 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2012 if (new_in) { 2013 if (!psf->sf_oldin) { 2014 struct ip6_sf_list *prev = NULL; 2015 2016 for (dpsf=pmc->mca_tomb; dpsf; 2017 dpsf=dpsf->sf_next) { 2018 if (ipv6_addr_equal(&dpsf->sf_addr, 2019 &psf->sf_addr)) 2020 break; 2021 prev = dpsf; 2022 } 2023 if (dpsf) { 2024 if (prev) 2025 prev->sf_next = dpsf->sf_next; 2026 else 2027 pmc->mca_tomb = dpsf->sf_next; 2028 kfree(dpsf); 2029 } 2030 psf->sf_crcount = qrv; 2031 rv++; 2032 } 2033 } else if (psf->sf_oldin) { 2034 psf->sf_crcount = 0; 2035 /* 2036 * add or update "delete" records if an active filter 2037 * is now inactive 2038 */ 2039 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2040 if (ipv6_addr_equal(&dpsf->sf_addr, 2041 &psf->sf_addr)) 2042 break; 2043 if (!dpsf) { 2044 dpsf = (struct ip6_sf_list *) 2045 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2046 if (!dpsf) 2047 continue; 2048 *dpsf = *psf; 2049 /* pmc->mca_lock held by callers */ 2050 dpsf->sf_next = pmc->mca_tomb; 2051 pmc->mca_tomb = dpsf; 2052 } 2053 dpsf->sf_crcount = qrv; 2054 rv++; 2055 } 2056 } 2057 return rv; 2058 } 2059 2060 /* 2061 * Add multicast source filter list to the interface list 2062 */ 2063 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2064 int sfmode, int sfcount, struct in6_addr *psfsrc, 2065 int delta) 2066 { 2067 struct ifmcaddr6 *pmc; 2068 int isexclude; 2069 int i, err; 2070 2071 if (!idev) 2072 return -ENODEV; 2073 read_lock_bh(&idev->lock); 2074 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2075 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2076 break; 2077 } 2078 if (!pmc) { 2079 /* MCA not found?? bug */ 2080 read_unlock_bh(&idev->lock); 2081 return -ESRCH; 2082 } 2083 spin_lock_bh(&pmc->mca_lock); 2084 2085 sf_markstate(pmc); 2086 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2087 if (!delta) 2088 pmc->mca_sfcount[sfmode]++; 2089 err = 0; 2090 for (i=0; i<sfcount; i++) { 2091 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2092 if (err) 2093 break; 2094 } 2095 if (err) { 2096 int j; 2097 2098 if (!delta) 2099 pmc->mca_sfcount[sfmode]--; 2100 for (j=0; j<i; j++) 2101 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2102 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2103 struct inet6_dev *idev = pmc->idev; 2104 struct ip6_sf_list *psf; 2105 2106 /* filter mode change */ 2107 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2108 pmc->mca_sfmode = MCAST_EXCLUDE; 2109 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2110 pmc->mca_sfmode = MCAST_INCLUDE; 2111 /* else no filters; keep old mode for reports */ 2112 2113 pmc->mca_crcount = idev->mc_qrv; 2114 idev->mc_ifc_count = pmc->mca_crcount; 2115 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2116 psf->sf_crcount = 0; 2117 mld_ifc_event(idev); 2118 } else if (sf_setstate(pmc)) 2119 mld_ifc_event(idev); 2120 spin_unlock_bh(&pmc->mca_lock); 2121 read_unlock_bh(&idev->lock); 2122 return err; 2123 } 2124 2125 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2126 { 2127 struct ip6_sf_list *psf, *nextpsf; 2128 2129 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2130 nextpsf = psf->sf_next; 2131 kfree(psf); 2132 } 2133 pmc->mca_tomb = NULL; 2134 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2135 nextpsf = psf->sf_next; 2136 kfree(psf); 2137 } 2138 pmc->mca_sources = NULL; 2139 pmc->mca_sfmode = MCAST_EXCLUDE; 2140 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2141 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2142 } 2143 2144 2145 static void igmp6_join_group(struct ifmcaddr6 *ma) 2146 { 2147 unsigned long delay; 2148 2149 if (ma->mca_flags & MAF_NOREPORT) 2150 return; 2151 2152 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2153 2154 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2155 2156 spin_lock_bh(&ma->mca_lock); 2157 if (del_timer(&ma->mca_timer)) { 2158 atomic_dec(&ma->mca_refcnt); 2159 delay = ma->mca_timer.expires - jiffies; 2160 } 2161 2162 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2163 atomic_inc(&ma->mca_refcnt); 2164 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2165 spin_unlock_bh(&ma->mca_lock); 2166 } 2167 2168 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2169 struct inet6_dev *idev) 2170 { 2171 int err; 2172 2173 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2174 * so no other readers or writers of iml or its sflist 2175 */ 2176 if (!iml->sflist) { 2177 /* any-source empty exclude case */ 2178 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2179 } 2180 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2181 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2182 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2183 iml->sflist = NULL; 2184 return err; 2185 } 2186 2187 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2188 { 2189 if (MLD_V1_SEEN(ma->idev)) { 2190 if (ma->mca_flags & MAF_LAST_REPORTER) 2191 igmp6_send(&ma->mca_addr, ma->idev->dev, 2192 ICMPV6_MGM_REDUCTION); 2193 } else { 2194 mld_add_delrec(ma->idev, ma); 2195 mld_ifc_event(ma->idev); 2196 } 2197 } 2198 2199 static void mld_gq_timer_expire(unsigned long data) 2200 { 2201 struct inet6_dev *idev = (struct inet6_dev *)data; 2202 2203 idev->mc_gq_running = 0; 2204 mld_send_report(idev, NULL); 2205 __in6_dev_put(idev); 2206 } 2207 2208 static void mld_ifc_timer_expire(unsigned long data) 2209 { 2210 struct inet6_dev *idev = (struct inet6_dev *)data; 2211 2212 mld_send_cr(idev); 2213 if (idev->mc_ifc_count) { 2214 idev->mc_ifc_count--; 2215 if (idev->mc_ifc_count) 2216 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2217 } 2218 __in6_dev_put(idev); 2219 } 2220 2221 static void mld_ifc_event(struct inet6_dev *idev) 2222 { 2223 if (MLD_V1_SEEN(idev)) 2224 return; 2225 idev->mc_ifc_count = idev->mc_qrv; 2226 mld_ifc_start_timer(idev, 1); 2227 } 2228 2229 2230 static void igmp6_timer_handler(unsigned long data) 2231 { 2232 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2233 2234 if (MLD_V1_SEEN(ma->idev)) 2235 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2236 else 2237 mld_send_report(ma->idev, ma); 2238 2239 spin_lock(&ma->mca_lock); 2240 ma->mca_flags |= MAF_LAST_REPORTER; 2241 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2242 spin_unlock(&ma->mca_lock); 2243 ma_put(ma); 2244 } 2245 2246 /* Device going down */ 2247 2248 void ipv6_mc_down(struct inet6_dev *idev) 2249 { 2250 struct ifmcaddr6 *i; 2251 2252 /* Withdraw multicast list */ 2253 2254 read_lock_bh(&idev->lock); 2255 idev->mc_ifc_count = 0; 2256 if (del_timer(&idev->mc_ifc_timer)) 2257 __in6_dev_put(idev); 2258 idev->mc_gq_running = 0; 2259 if (del_timer(&idev->mc_gq_timer)) 2260 __in6_dev_put(idev); 2261 2262 for (i = idev->mc_list; i; i=i->next) 2263 igmp6_group_dropped(i); 2264 read_unlock_bh(&idev->lock); 2265 2266 mld_clear_delrec(idev); 2267 } 2268 2269 2270 /* Device going up */ 2271 2272 void ipv6_mc_up(struct inet6_dev *idev) 2273 { 2274 struct ifmcaddr6 *i; 2275 2276 /* Install multicast list, except for all-nodes (already installed) */ 2277 2278 read_lock_bh(&idev->lock); 2279 for (i = idev->mc_list; i; i=i->next) 2280 igmp6_group_added(i); 2281 read_unlock_bh(&idev->lock); 2282 } 2283 2284 /* IPv6 device initialization. */ 2285 2286 void ipv6_mc_init_dev(struct inet6_dev *idev) 2287 { 2288 write_lock_bh(&idev->lock); 2289 rwlock_init(&idev->mc_lock); 2290 idev->mc_gq_running = 0; 2291 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, 2292 (unsigned long)idev); 2293 idev->mc_tomb = NULL; 2294 idev->mc_ifc_count = 0; 2295 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, 2296 (unsigned long)idev); 2297 idev->mc_qrv = MLD_QRV_DEFAULT; 2298 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2299 idev->mc_v1_seen = 0; 2300 write_unlock_bh(&idev->lock); 2301 } 2302 2303 /* 2304 * Device is about to be destroyed: clean up. 2305 */ 2306 2307 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2308 { 2309 struct ifmcaddr6 *i; 2310 2311 /* Deactivate timers */ 2312 ipv6_mc_down(idev); 2313 2314 /* Delete all-nodes address. */ 2315 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2316 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2317 * fail. 2318 */ 2319 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); 2320 2321 if (idev->cnf.forwarding) 2322 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); 2323 2324 write_lock_bh(&idev->lock); 2325 while ((i = idev->mc_list) != NULL) { 2326 idev->mc_list = i->next; 2327 write_unlock_bh(&idev->lock); 2328 2329 igmp6_group_dropped(i); 2330 ma_put(i); 2331 2332 write_lock_bh(&idev->lock); 2333 } 2334 write_unlock_bh(&idev->lock); 2335 } 2336 2337 #ifdef CONFIG_PROC_FS 2338 struct igmp6_mc_iter_state { 2339 struct seq_net_private p; 2340 struct net_device *dev; 2341 struct inet6_dev *idev; 2342 }; 2343 2344 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2345 2346 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2347 { 2348 struct ifmcaddr6 *im = NULL; 2349 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2350 struct net *net = seq_file_net(seq); 2351 2352 state->idev = NULL; 2353 for_each_netdev(net, state->dev) { 2354 struct inet6_dev *idev; 2355 idev = in6_dev_get(state->dev); 2356 if (!idev) 2357 continue; 2358 read_lock_bh(&idev->lock); 2359 im = idev->mc_list; 2360 if (im) { 2361 state->idev = idev; 2362 break; 2363 } 2364 read_unlock_bh(&idev->lock); 2365 in6_dev_put(idev); 2366 } 2367 return im; 2368 } 2369 2370 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2371 { 2372 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2373 2374 im = im->next; 2375 while (!im) { 2376 if (likely(state->idev != NULL)) { 2377 read_unlock_bh(&state->idev->lock); 2378 in6_dev_put(state->idev); 2379 } 2380 state->dev = next_net_device(state->dev); 2381 if (!state->dev) { 2382 state->idev = NULL; 2383 break; 2384 } 2385 state->idev = in6_dev_get(state->dev); 2386 if (!state->idev) 2387 continue; 2388 read_lock_bh(&state->idev->lock); 2389 im = state->idev->mc_list; 2390 } 2391 return im; 2392 } 2393 2394 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2395 { 2396 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2397 if (im) 2398 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2399 --pos; 2400 return pos ? NULL : im; 2401 } 2402 2403 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2404 __acquires(dev_base_lock) 2405 { 2406 read_lock(&dev_base_lock); 2407 return igmp6_mc_get_idx(seq, *pos); 2408 } 2409 2410 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2411 { 2412 struct ifmcaddr6 *im; 2413 im = igmp6_mc_get_next(seq, v); 2414 ++*pos; 2415 return im; 2416 } 2417 2418 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2419 __releases(dev_base_lock) 2420 { 2421 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2422 if (likely(state->idev != NULL)) { 2423 read_unlock_bh(&state->idev->lock); 2424 in6_dev_put(state->idev); 2425 state->idev = NULL; 2426 } 2427 state->dev = NULL; 2428 read_unlock(&dev_base_lock); 2429 } 2430 2431 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2432 { 2433 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2434 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2435 2436 seq_printf(seq, 2437 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2438 state->dev->ifindex, state->dev->name, 2439 NIP6(im->mca_addr), 2440 im->mca_users, im->mca_flags, 2441 (im->mca_flags&MAF_TIMER_RUNNING) ? 2442 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2443 return 0; 2444 } 2445 2446 static const struct seq_operations igmp6_mc_seq_ops = { 2447 .start = igmp6_mc_seq_start, 2448 .next = igmp6_mc_seq_next, 2449 .stop = igmp6_mc_seq_stop, 2450 .show = igmp6_mc_seq_show, 2451 }; 2452 2453 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2454 { 2455 return seq_open_net(inode, file, &igmp6_mc_seq_ops, 2456 sizeof(struct igmp6_mc_iter_state)); 2457 } 2458 2459 static const struct file_operations igmp6_mc_seq_fops = { 2460 .owner = THIS_MODULE, 2461 .open = igmp6_mc_seq_open, 2462 .read = seq_read, 2463 .llseek = seq_lseek, 2464 .release = seq_release_net, 2465 }; 2466 2467 struct igmp6_mcf_iter_state { 2468 struct seq_net_private p; 2469 struct net_device *dev; 2470 struct inet6_dev *idev; 2471 struct ifmcaddr6 *im; 2472 }; 2473 2474 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2475 2476 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2477 { 2478 struct ip6_sf_list *psf = NULL; 2479 struct ifmcaddr6 *im = NULL; 2480 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2481 struct net *net = seq_file_net(seq); 2482 2483 state->idev = NULL; 2484 state->im = NULL; 2485 for_each_netdev(net, state->dev) { 2486 struct inet6_dev *idev; 2487 idev = in6_dev_get(state->dev); 2488 if (unlikely(idev == NULL)) 2489 continue; 2490 read_lock_bh(&idev->lock); 2491 im = idev->mc_list; 2492 if (likely(im != NULL)) { 2493 spin_lock_bh(&im->mca_lock); 2494 psf = im->mca_sources; 2495 if (likely(psf != NULL)) { 2496 state->im = im; 2497 state->idev = idev; 2498 break; 2499 } 2500 spin_unlock_bh(&im->mca_lock); 2501 } 2502 read_unlock_bh(&idev->lock); 2503 in6_dev_put(idev); 2504 } 2505 return psf; 2506 } 2507 2508 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2509 { 2510 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2511 2512 psf = psf->sf_next; 2513 while (!psf) { 2514 spin_unlock_bh(&state->im->mca_lock); 2515 state->im = state->im->next; 2516 while (!state->im) { 2517 if (likely(state->idev != NULL)) { 2518 read_unlock_bh(&state->idev->lock); 2519 in6_dev_put(state->idev); 2520 } 2521 state->dev = next_net_device(state->dev); 2522 if (!state->dev) { 2523 state->idev = NULL; 2524 goto out; 2525 } 2526 state->idev = in6_dev_get(state->dev); 2527 if (!state->idev) 2528 continue; 2529 read_lock_bh(&state->idev->lock); 2530 state->im = state->idev->mc_list; 2531 } 2532 if (!state->im) 2533 break; 2534 spin_lock_bh(&state->im->mca_lock); 2535 psf = state->im->mca_sources; 2536 } 2537 out: 2538 return psf; 2539 } 2540 2541 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2542 { 2543 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2544 if (psf) 2545 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2546 --pos; 2547 return pos ? NULL : psf; 2548 } 2549 2550 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2551 __acquires(dev_base_lock) 2552 { 2553 read_lock(&dev_base_lock); 2554 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2555 } 2556 2557 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2558 { 2559 struct ip6_sf_list *psf; 2560 if (v == SEQ_START_TOKEN) 2561 psf = igmp6_mcf_get_first(seq); 2562 else 2563 psf = igmp6_mcf_get_next(seq, v); 2564 ++*pos; 2565 return psf; 2566 } 2567 2568 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2569 __releases(dev_base_lock) 2570 { 2571 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2572 if (likely(state->im != NULL)) { 2573 spin_unlock_bh(&state->im->mca_lock); 2574 state->im = NULL; 2575 } 2576 if (likely(state->idev != NULL)) { 2577 read_unlock_bh(&state->idev->lock); 2578 in6_dev_put(state->idev); 2579 state->idev = NULL; 2580 } 2581 state->dev = NULL; 2582 read_unlock(&dev_base_lock); 2583 } 2584 2585 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2586 { 2587 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2588 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2589 2590 if (v == SEQ_START_TOKEN) { 2591 seq_printf(seq, 2592 "%3s %6s " 2593 "%32s %32s %6s %6s\n", "Idx", 2594 "Device", "Multicast Address", 2595 "Source Address", "INC", "EXC"); 2596 } else { 2597 seq_printf(seq, 2598 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n", 2599 state->dev->ifindex, state->dev->name, 2600 NIP6(state->im->mca_addr), 2601 NIP6(psf->sf_addr), 2602 psf->sf_count[MCAST_INCLUDE], 2603 psf->sf_count[MCAST_EXCLUDE]); 2604 } 2605 return 0; 2606 } 2607 2608 static const struct seq_operations igmp6_mcf_seq_ops = { 2609 .start = igmp6_mcf_seq_start, 2610 .next = igmp6_mcf_seq_next, 2611 .stop = igmp6_mcf_seq_stop, 2612 .show = igmp6_mcf_seq_show, 2613 }; 2614 2615 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2616 { 2617 return seq_open_net(inode, file, &igmp6_mcf_seq_ops, 2618 sizeof(struct igmp6_mcf_iter_state)); 2619 } 2620 2621 static const struct file_operations igmp6_mcf_seq_fops = { 2622 .owner = THIS_MODULE, 2623 .open = igmp6_mcf_seq_open, 2624 .read = seq_read, 2625 .llseek = seq_lseek, 2626 .release = seq_release_net, 2627 }; 2628 2629 static int igmp6_proc_init(struct net *net) 2630 { 2631 int err; 2632 2633 err = -ENOMEM; 2634 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops)) 2635 goto out; 2636 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO, 2637 &igmp6_mcf_seq_fops)) 2638 goto out_proc_net_igmp6; 2639 2640 err = 0; 2641 out: 2642 return err; 2643 2644 out_proc_net_igmp6: 2645 proc_net_remove(net, "igmp6"); 2646 goto out; 2647 } 2648 2649 static void igmp6_proc_exit(struct net *net) 2650 { 2651 proc_net_remove(net, "mcfilter6"); 2652 proc_net_remove(net, "igmp6"); 2653 } 2654 #else 2655 static int igmp6_proc_init(struct net *net) 2656 { 2657 return 0; 2658 } 2659 static void igmp6_proc_exit(struct net *net) 2660 { 2661 ; 2662 } 2663 #endif 2664 2665 static int igmp6_net_init(struct net *net) 2666 { 2667 int err; 2668 2669 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, 2670 SOCK_RAW, IPPROTO_ICMPV6, net); 2671 if (err < 0) { 2672 printk(KERN_ERR 2673 "Failed to initialize the IGMP6 control socket (err %d).\n", 2674 err); 2675 goto out; 2676 } 2677 2678 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; 2679 2680 err = igmp6_proc_init(net); 2681 if (err) 2682 goto out_sock_create; 2683 out: 2684 return err; 2685 2686 out_sock_create: 2687 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2688 goto out; 2689 } 2690 2691 static void igmp6_net_exit(struct net *net) 2692 { 2693 inet_ctl_sock_destroy(net->ipv6.igmp_sk); 2694 igmp6_proc_exit(net); 2695 } 2696 2697 static struct pernet_operations igmp6_net_ops = { 2698 .init = igmp6_net_init, 2699 .exit = igmp6_net_exit, 2700 }; 2701 2702 int __init igmp6_init(void) 2703 { 2704 return register_pernet_subsys(&igmp6_net_ops); 2705 } 2706 2707 void igmp6_cleanup(void) 2708 { 2709 unregister_pernet_subsys(&igmp6_net_ops); 2710 } 2711