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/sock.h> 53 #include <net/snmp.h> 54 55 #include <net/ipv6.h> 56 #include <net/protocol.h> 57 #include <net/if_inet6.h> 58 #include <net/ndisc.h> 59 #include <net/addrconf.h> 60 #include <net/ip6_route.h> 61 62 #include <net/ip6_checksum.h> 63 64 /* Set to 3 to get tracing... */ 65 #define MCAST_DEBUG 2 66 67 #if MCAST_DEBUG >= 3 68 #define MDBG(x) printk x 69 #else 70 #define MDBG(x) 71 #endif 72 73 /* 74 * These header formats should be in a separate include file, but icmpv6.h 75 * doesn't have in6_addr defined in all cases, there is no __u128, and no 76 * other files reference these. 77 * 78 * +-DLS 4/14/03 79 */ 80 81 /* Multicast Listener Discovery version 2 headers */ 82 83 struct mld2_grec { 84 __u8 grec_type; 85 __u8 grec_auxwords; 86 __be16 grec_nsrcs; 87 struct in6_addr grec_mca; 88 struct in6_addr grec_src[0]; 89 }; 90 91 struct mld2_report { 92 __u8 type; 93 __u8 resv1; 94 __sum16 csum; 95 __be16 resv2; 96 __be16 ngrec; 97 struct mld2_grec grec[0]; 98 }; 99 100 struct mld2_query { 101 __u8 type; 102 __u8 code; 103 __sum16 csum; 104 __be16 mrc; 105 __be16 resv1; 106 struct in6_addr mca; 107 #if defined(__LITTLE_ENDIAN_BITFIELD) 108 __u8 qrv:3, 109 suppress:1, 110 resv2:4; 111 #elif defined(__BIG_ENDIAN_BITFIELD) 112 __u8 resv2:4, 113 suppress:1, 114 qrv:3; 115 #else 116 #error "Please fix <asm/byteorder.h>" 117 #endif 118 __u8 qqic; 119 __be16 nsrcs; 120 struct in6_addr srcs[0]; 121 }; 122 123 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 124 125 /* Big mc list lock for all the sockets */ 126 static DEFINE_RWLOCK(ipv6_sk_mc_lock); 127 128 static struct socket *igmp6_socket; 129 130 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr); 131 132 static void igmp6_join_group(struct ifmcaddr6 *ma); 133 static void igmp6_leave_group(struct ifmcaddr6 *ma); 134 static void igmp6_timer_handler(unsigned long data); 135 136 static void mld_gq_timer_expire(unsigned long data); 137 static void mld_ifc_timer_expire(unsigned long data); 138 static void mld_ifc_event(struct inet6_dev *idev); 139 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 140 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 141 static void mld_clear_delrec(struct inet6_dev *idev); 142 static int sf_setstate(struct ifmcaddr6 *pmc); 143 static void sf_markstate(struct ifmcaddr6 *pmc); 144 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 145 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 146 int sfmode, int sfcount, struct in6_addr *psfsrc, 147 int delta); 148 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 149 int sfmode, int sfcount, struct in6_addr *psfsrc, 150 int delta); 151 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 152 struct inet6_dev *idev); 153 154 155 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 156 #define MLD_QRV_DEFAULT 2 157 158 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \ 159 (idev)->cnf.force_mld_version == 1 || \ 160 ((idev)->mc_v1_seen && \ 161 time_before(jiffies, (idev)->mc_v1_seen))) 162 163 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 164 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 165 ((value) < (thresh) ? (value) : \ 166 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \ 167 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 168 169 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) 170 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) 171 172 #define IPV6_MLD_MAX_MSF 64 173 174 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; 175 176 /* 177 * socket join on multicast group 178 */ 179 180 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr) 181 { 182 struct net_device *dev = NULL; 183 struct ipv6_mc_socklist *mc_lst; 184 struct ipv6_pinfo *np = inet6_sk(sk); 185 int err; 186 187 if (!ipv6_addr_is_multicast(addr)) 188 return -EINVAL; 189 190 read_lock_bh(&ipv6_sk_mc_lock); 191 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 192 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 193 ipv6_addr_equal(&mc_lst->addr, addr)) { 194 read_unlock_bh(&ipv6_sk_mc_lock); 195 return -EADDRINUSE; 196 } 197 } 198 read_unlock_bh(&ipv6_sk_mc_lock); 199 200 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 201 202 if (mc_lst == NULL) 203 return -ENOMEM; 204 205 mc_lst->next = NULL; 206 ipv6_addr_copy(&mc_lst->addr, addr); 207 208 if (ifindex == 0) { 209 struct rt6_info *rt; 210 rt = rt6_lookup(addr, NULL, 0, 0); 211 if (rt) { 212 dev = rt->rt6i_dev; 213 dev_hold(dev); 214 dst_release(&rt->u.dst); 215 } 216 } else 217 dev = dev_get_by_index(ifindex); 218 219 if (dev == NULL) { 220 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 221 return -ENODEV; 222 } 223 224 mc_lst->ifindex = dev->ifindex; 225 mc_lst->sfmode = MCAST_EXCLUDE; 226 rwlock_init(&mc_lst->sflock); 227 mc_lst->sflist = NULL; 228 229 /* 230 * now add/increase the group membership on the device 231 */ 232 233 err = ipv6_dev_mc_inc(dev, addr); 234 235 if (err) { 236 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 237 dev_put(dev); 238 return err; 239 } 240 241 write_lock_bh(&ipv6_sk_mc_lock); 242 mc_lst->next = np->ipv6_mc_list; 243 np->ipv6_mc_list = mc_lst; 244 write_unlock_bh(&ipv6_sk_mc_lock); 245 246 dev_put(dev); 247 248 return 0; 249 } 250 251 /* 252 * socket leave on multicast group 253 */ 254 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr) 255 { 256 struct ipv6_pinfo *np = inet6_sk(sk); 257 struct ipv6_mc_socklist *mc_lst, **lnk; 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 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) { 269 struct inet6_dev *idev = in6_dev_get(dev); 270 271 (void) ip6_mc_leave_src(sk, mc_lst, idev); 272 if (idev) { 273 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 274 in6_dev_put(idev); 275 } 276 dev_put(dev); 277 } else 278 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 279 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 280 return 0; 281 } 282 } 283 write_unlock_bh(&ipv6_sk_mc_lock); 284 285 return -EADDRNOTAVAIL; 286 } 287 288 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex) 289 { 290 struct net_device *dev = NULL; 291 struct inet6_dev *idev = NULL; 292 293 if (ifindex == 0) { 294 struct rt6_info *rt; 295 296 rt = rt6_lookup(group, NULL, 0, 0); 297 if (rt) { 298 dev = rt->rt6i_dev; 299 dev_hold(dev); 300 dst_release(&rt->u.dst); 301 } 302 } else 303 dev = dev_get_by_index(ifindex); 304 305 if (!dev) 306 return NULL; 307 idev = in6_dev_get(dev); 308 if (!idev) { 309 dev_put(dev); 310 return NULL; 311 } 312 read_lock_bh(&idev->lock); 313 if (idev->dead) { 314 read_unlock_bh(&idev->lock); 315 in6_dev_put(idev); 316 dev_put(dev); 317 return NULL; 318 } 319 return idev; 320 } 321 322 void ipv6_sock_mc_close(struct sock *sk) 323 { 324 struct ipv6_pinfo *np = inet6_sk(sk); 325 struct ipv6_mc_socklist *mc_lst; 326 327 write_lock_bh(&ipv6_sk_mc_lock); 328 while ((mc_lst = np->ipv6_mc_list) != NULL) { 329 struct net_device *dev; 330 331 np->ipv6_mc_list = mc_lst->next; 332 write_unlock_bh(&ipv6_sk_mc_lock); 333 334 dev = dev_get_by_index(mc_lst->ifindex); 335 if (dev) { 336 struct inet6_dev *idev = in6_dev_get(dev); 337 338 (void) ip6_mc_leave_src(sk, mc_lst, idev); 339 if (idev) { 340 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 341 in6_dev_put(idev); 342 } 343 dev_put(dev); 344 } else 345 (void) ip6_mc_leave_src(sk, mc_lst, NULL); 346 347 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 348 349 write_lock_bh(&ipv6_sk_mc_lock); 350 } 351 write_unlock_bh(&ipv6_sk_mc_lock); 352 } 353 354 int ip6_mc_source(int add, int omode, struct sock *sk, 355 struct group_source_req *pgsr) 356 { 357 struct in6_addr *source, *group; 358 struct ipv6_mc_socklist *pmc; 359 struct net_device *dev; 360 struct inet6_dev *idev; 361 struct ipv6_pinfo *inet6 = inet6_sk(sk); 362 struct ip6_sf_socklist *psl; 363 int i, j, rv; 364 int leavegroup = 0; 365 int pmclocked = 0; 366 int err; 367 368 if (pgsr->gsr_group.ss_family != AF_INET6 || 369 pgsr->gsr_source.ss_family != AF_INET6) 370 return -EINVAL; 371 372 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 373 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 374 375 if (!ipv6_addr_is_multicast(group)) 376 return -EINVAL; 377 378 idev = ip6_mc_find_dev(group, pgsr->gsr_interface); 379 if (!idev) 380 return -ENODEV; 381 dev = idev->dev; 382 383 err = -EADDRNOTAVAIL; 384 385 read_lock_bh(&ipv6_sk_mc_lock); 386 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 387 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 388 continue; 389 if (ipv6_addr_equal(&pmc->addr, group)) 390 break; 391 } 392 if (!pmc) { /* must have a prior join */ 393 err = -EINVAL; 394 goto done; 395 } 396 /* if a source filter was set, must be the same mode as before */ 397 if (pmc->sflist) { 398 if (pmc->sfmode != omode) { 399 err = -EINVAL; 400 goto done; 401 } 402 } else if (pmc->sfmode != omode) { 403 /* allow mode switches for empty-set filters */ 404 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 405 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 406 pmc->sfmode = omode; 407 } 408 409 write_lock_bh(&pmc->sflock); 410 pmclocked = 1; 411 412 psl = pmc->sflist; 413 if (!add) { 414 if (!psl) 415 goto done; /* err = -EADDRNOTAVAIL */ 416 rv = !0; 417 for (i=0; i<psl->sl_count; i++) { 418 rv = memcmp(&psl->sl_addr[i], source, 419 sizeof(struct in6_addr)); 420 if (rv == 0) 421 break; 422 } 423 if (rv) /* source not found */ 424 goto done; /* err = -EADDRNOTAVAIL */ 425 426 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 427 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 428 leavegroup = 1; 429 goto done; 430 } 431 432 /* update the interface filter */ 433 ip6_mc_del_src(idev, group, omode, 1, source, 1); 434 435 for (j=i+1; j<psl->sl_count; j++) 436 psl->sl_addr[j-1] = psl->sl_addr[j]; 437 psl->sl_count--; 438 err = 0; 439 goto done; 440 } 441 /* else, add a new source to the filter */ 442 443 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 444 err = -ENOBUFS; 445 goto done; 446 } 447 if (!psl || psl->sl_count == psl->sl_max) { 448 struct ip6_sf_socklist *newpsl; 449 int count = IP6_SFBLOCK; 450 451 if (psl) 452 count += psl->sl_max; 453 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 454 if (!newpsl) { 455 err = -ENOBUFS; 456 goto done; 457 } 458 newpsl->sl_max = count; 459 newpsl->sl_count = count - IP6_SFBLOCK; 460 if (psl) { 461 for (i=0; i<psl->sl_count; i++) 462 newpsl->sl_addr[i] = psl->sl_addr[i]; 463 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 464 } 465 pmc->sflist = psl = newpsl; 466 } 467 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 468 for (i=0; i<psl->sl_count; i++) { 469 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 470 if (rv == 0) 471 break; 472 } 473 if (rv == 0) /* address already there is an error */ 474 goto done; 475 for (j=psl->sl_count-1; j>=i; j--) 476 psl->sl_addr[j+1] = psl->sl_addr[j]; 477 psl->sl_addr[i] = *source; 478 psl->sl_count++; 479 err = 0; 480 /* update the interface list */ 481 ip6_mc_add_src(idev, group, omode, 1, source, 1); 482 done: 483 if (pmclocked) 484 write_unlock_bh(&pmc->sflock); 485 read_unlock_bh(&ipv6_sk_mc_lock); 486 read_unlock_bh(&idev->lock); 487 in6_dev_put(idev); 488 dev_put(dev); 489 if (leavegroup) 490 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 491 return err; 492 } 493 494 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 495 { 496 struct in6_addr *group; 497 struct ipv6_mc_socklist *pmc; 498 struct net_device *dev; 499 struct inet6_dev *idev; 500 struct ipv6_pinfo *inet6 = inet6_sk(sk); 501 struct ip6_sf_socklist *newpsl, *psl; 502 int leavegroup = 0; 503 int i, err; 504 505 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 506 507 if (!ipv6_addr_is_multicast(group)) 508 return -EINVAL; 509 if (gsf->gf_fmode != MCAST_INCLUDE && 510 gsf->gf_fmode != MCAST_EXCLUDE) 511 return -EINVAL; 512 513 idev = ip6_mc_find_dev(group, gsf->gf_interface); 514 515 if (!idev) 516 return -ENODEV; 517 dev = idev->dev; 518 519 err = 0; 520 read_lock_bh(&ipv6_sk_mc_lock); 521 522 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 523 leavegroup = 1; 524 goto done; 525 } 526 527 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 528 if (pmc->ifindex != gsf->gf_interface) 529 continue; 530 if (ipv6_addr_equal(&pmc->addr, group)) 531 break; 532 } 533 if (!pmc) { /* must have a prior join */ 534 err = -EINVAL; 535 goto done; 536 } 537 if (gsf->gf_numsrc) { 538 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 539 GFP_ATOMIC); 540 if (!newpsl) { 541 err = -ENOBUFS; 542 goto done; 543 } 544 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 545 for (i=0; i<newpsl->sl_count; ++i) { 546 struct sockaddr_in6 *psin6; 547 548 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 549 newpsl->sl_addr[i] = psin6->sin6_addr; 550 } 551 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 552 newpsl->sl_count, newpsl->sl_addr, 0); 553 if (err) { 554 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 555 goto done; 556 } 557 } else { 558 newpsl = NULL; 559 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 560 } 561 562 write_lock_bh(&pmc->sflock); 563 psl = pmc->sflist; 564 if (psl) { 565 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 566 psl->sl_count, psl->sl_addr, 0); 567 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 568 } else 569 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 570 pmc->sflist = newpsl; 571 pmc->sfmode = gsf->gf_fmode; 572 write_unlock_bh(&pmc->sflock); 573 err = 0; 574 done: 575 read_unlock_bh(&ipv6_sk_mc_lock); 576 read_unlock_bh(&idev->lock); 577 in6_dev_put(idev); 578 dev_put(dev); 579 if (leavegroup) 580 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 581 return err; 582 } 583 584 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 585 struct group_filter __user *optval, int __user *optlen) 586 { 587 int err, i, count, copycount; 588 struct in6_addr *group; 589 struct ipv6_mc_socklist *pmc; 590 struct inet6_dev *idev; 591 struct net_device *dev; 592 struct ipv6_pinfo *inet6 = inet6_sk(sk); 593 struct ip6_sf_socklist *psl; 594 595 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 596 597 if (!ipv6_addr_is_multicast(group)) 598 return -EINVAL; 599 600 idev = ip6_mc_find_dev(group, gsf->gf_interface); 601 602 if (!idev) 603 return -ENODEV; 604 605 dev = idev->dev; 606 607 err = -EADDRNOTAVAIL; 608 /* 609 * changes to the ipv6_mc_list require the socket lock and 610 * a read lock on ip6_sk_mc_lock. We have the socket lock, 611 * so reading the list is safe. 612 */ 613 614 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 615 if (pmc->ifindex != gsf->gf_interface) 616 continue; 617 if (ipv6_addr_equal(group, &pmc->addr)) 618 break; 619 } 620 if (!pmc) /* must have a prior join */ 621 goto done; 622 gsf->gf_fmode = pmc->sfmode; 623 psl = pmc->sflist; 624 count = psl ? psl->sl_count : 0; 625 read_unlock_bh(&idev->lock); 626 in6_dev_put(idev); 627 dev_put(dev); 628 629 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 630 gsf->gf_numsrc = count; 631 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 632 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 633 return -EFAULT; 634 } 635 /* changes to psl require the socket lock, a read lock on 636 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 637 * have the socket lock, so reading here is safe. 638 */ 639 for (i=0; i<copycount; i++) { 640 struct sockaddr_in6 *psin6; 641 struct sockaddr_storage ss; 642 643 psin6 = (struct sockaddr_in6 *)&ss; 644 memset(&ss, 0, sizeof(ss)); 645 psin6->sin6_family = AF_INET6; 646 psin6->sin6_addr = psl->sl_addr[i]; 647 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 648 return -EFAULT; 649 } 650 return 0; 651 done: 652 read_unlock_bh(&idev->lock); 653 in6_dev_put(idev); 654 dev_put(dev); 655 return err; 656 } 657 658 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr, 659 struct in6_addr *src_addr) 660 { 661 struct ipv6_pinfo *np = inet6_sk(sk); 662 struct ipv6_mc_socklist *mc; 663 struct ip6_sf_socklist *psl; 664 int rv = 1; 665 666 read_lock(&ipv6_sk_mc_lock); 667 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 668 if (ipv6_addr_equal(&mc->addr, mc_addr)) 669 break; 670 } 671 if (!mc) { 672 read_unlock(&ipv6_sk_mc_lock); 673 return 1; 674 } 675 read_lock(&mc->sflock); 676 psl = mc->sflist; 677 if (!psl) { 678 rv = mc->sfmode == MCAST_EXCLUDE; 679 } else { 680 int i; 681 682 for (i=0; i<psl->sl_count; i++) { 683 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 684 break; 685 } 686 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 687 rv = 0; 688 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 689 rv = 0; 690 } 691 read_unlock(&mc->sflock); 692 read_unlock(&ipv6_sk_mc_lock); 693 694 return rv; 695 } 696 697 static void ma_put(struct ifmcaddr6 *mc) 698 { 699 if (atomic_dec_and_test(&mc->mca_refcnt)) { 700 in6_dev_put(mc->idev); 701 kfree(mc); 702 } 703 } 704 705 static void igmp6_group_added(struct ifmcaddr6 *mc) 706 { 707 struct net_device *dev = mc->idev->dev; 708 char buf[MAX_ADDR_LEN]; 709 710 spin_lock_bh(&mc->mca_lock); 711 if (!(mc->mca_flags&MAF_LOADED)) { 712 mc->mca_flags |= MAF_LOADED; 713 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 714 dev_mc_add(dev, buf, dev->addr_len, 0); 715 } 716 spin_unlock_bh(&mc->mca_lock); 717 718 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 719 return; 720 721 if (MLD_V1_SEEN(mc->idev)) { 722 igmp6_join_group(mc); 723 return; 724 } 725 /* else v2 */ 726 727 mc->mca_crcount = mc->idev->mc_qrv; 728 mld_ifc_event(mc->idev); 729 } 730 731 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 732 { 733 struct net_device *dev = mc->idev->dev; 734 char buf[MAX_ADDR_LEN]; 735 736 spin_lock_bh(&mc->mca_lock); 737 if (mc->mca_flags&MAF_LOADED) { 738 mc->mca_flags &= ~MAF_LOADED; 739 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 740 dev_mc_delete(dev, buf, dev->addr_len, 0); 741 } 742 743 if (mc->mca_flags & MAF_NOREPORT) 744 goto done; 745 spin_unlock_bh(&mc->mca_lock); 746 747 if (!mc->idev->dead) 748 igmp6_leave_group(mc); 749 750 spin_lock_bh(&mc->mca_lock); 751 if (del_timer(&mc->mca_timer)) 752 atomic_dec(&mc->mca_refcnt); 753 done: 754 ip6_mc_clear_src(mc); 755 spin_unlock_bh(&mc->mca_lock); 756 } 757 758 /* 759 * deleted ifmcaddr6 manipulation 760 */ 761 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 762 { 763 struct ifmcaddr6 *pmc; 764 765 /* this is an "ifmcaddr6" for convenience; only the fields below 766 * are actually used. In particular, the refcnt and users are not 767 * used for management of the delete list. Using the same structure 768 * for deleted items allows change reports to use common code with 769 * non-deleted or query-response MCA's. 770 */ 771 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 772 if (!pmc) 773 return; 774 775 spin_lock_bh(&im->mca_lock); 776 spin_lock_init(&pmc->mca_lock); 777 pmc->idev = im->idev; 778 in6_dev_hold(idev); 779 pmc->mca_addr = im->mca_addr; 780 pmc->mca_crcount = idev->mc_qrv; 781 pmc->mca_sfmode = im->mca_sfmode; 782 if (pmc->mca_sfmode == MCAST_INCLUDE) { 783 struct ip6_sf_list *psf; 784 785 pmc->mca_tomb = im->mca_tomb; 786 pmc->mca_sources = im->mca_sources; 787 im->mca_tomb = im->mca_sources = NULL; 788 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 789 psf->sf_crcount = pmc->mca_crcount; 790 } 791 spin_unlock_bh(&im->mca_lock); 792 793 write_lock_bh(&idev->mc_lock); 794 pmc->next = idev->mc_tomb; 795 idev->mc_tomb = pmc; 796 write_unlock_bh(&idev->mc_lock); 797 } 798 799 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 800 { 801 struct ifmcaddr6 *pmc, *pmc_prev; 802 struct ip6_sf_list *psf, *psf_next; 803 804 write_lock_bh(&idev->mc_lock); 805 pmc_prev = NULL; 806 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 807 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 808 break; 809 pmc_prev = pmc; 810 } 811 if (pmc) { 812 if (pmc_prev) 813 pmc_prev->next = pmc->next; 814 else 815 idev->mc_tomb = pmc->next; 816 } 817 write_unlock_bh(&idev->mc_lock); 818 if (pmc) { 819 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 820 psf_next = psf->sf_next; 821 kfree(psf); 822 } 823 in6_dev_put(pmc->idev); 824 kfree(pmc); 825 } 826 } 827 828 static void mld_clear_delrec(struct inet6_dev *idev) 829 { 830 struct ifmcaddr6 *pmc, *nextpmc; 831 832 write_lock_bh(&idev->mc_lock); 833 pmc = idev->mc_tomb; 834 idev->mc_tomb = NULL; 835 write_unlock_bh(&idev->mc_lock); 836 837 for (; pmc; pmc = nextpmc) { 838 nextpmc = pmc->next; 839 ip6_mc_clear_src(pmc); 840 in6_dev_put(pmc->idev); 841 kfree(pmc); 842 } 843 844 /* clear dead sources, too */ 845 read_lock_bh(&idev->lock); 846 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 847 struct ip6_sf_list *psf, *psf_next; 848 849 spin_lock_bh(&pmc->mca_lock); 850 psf = pmc->mca_tomb; 851 pmc->mca_tomb = NULL; 852 spin_unlock_bh(&pmc->mca_lock); 853 for (; psf; psf=psf_next) { 854 psf_next = psf->sf_next; 855 kfree(psf); 856 } 857 } 858 read_unlock_bh(&idev->lock); 859 } 860 861 862 /* 863 * device multicast group inc (add if not found) 864 */ 865 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr) 866 { 867 struct ifmcaddr6 *mc; 868 struct inet6_dev *idev; 869 870 idev = in6_dev_get(dev); 871 872 if (idev == NULL) 873 return -EINVAL; 874 875 write_lock_bh(&idev->lock); 876 if (idev->dead) { 877 write_unlock_bh(&idev->lock); 878 in6_dev_put(idev); 879 return -ENODEV; 880 } 881 882 for (mc = idev->mc_list; mc; mc = mc->next) { 883 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 884 mc->mca_users++; 885 write_unlock_bh(&idev->lock); 886 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 887 NULL, 0); 888 in6_dev_put(idev); 889 return 0; 890 } 891 } 892 893 /* 894 * not found: create a new one. 895 */ 896 897 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 898 899 if (mc == NULL) { 900 write_unlock_bh(&idev->lock); 901 in6_dev_put(idev); 902 return -ENOMEM; 903 } 904 905 init_timer(&mc->mca_timer); 906 mc->mca_timer.function = igmp6_timer_handler; 907 mc->mca_timer.data = (unsigned long) mc; 908 909 ipv6_addr_copy(&mc->mca_addr, addr); 910 mc->idev = idev; 911 mc->mca_users = 1; 912 /* mca_stamp should be updated upon changes */ 913 mc->mca_cstamp = mc->mca_tstamp = jiffies; 914 atomic_set(&mc->mca_refcnt, 2); 915 spin_lock_init(&mc->mca_lock); 916 917 /* initial mode is (EX, empty) */ 918 mc->mca_sfmode = MCAST_EXCLUDE; 919 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 920 921 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 922 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 923 mc->mca_flags |= MAF_NOREPORT; 924 925 mc->next = idev->mc_list; 926 idev->mc_list = mc; 927 write_unlock_bh(&idev->lock); 928 929 mld_del_delrec(idev, &mc->mca_addr); 930 igmp6_group_added(mc); 931 ma_put(mc); 932 return 0; 933 } 934 935 /* 936 * device multicast group del 937 */ 938 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) 939 { 940 struct ifmcaddr6 *ma, **map; 941 942 write_lock_bh(&idev->lock); 943 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 944 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 945 if (--ma->mca_users == 0) { 946 *map = ma->next; 947 write_unlock_bh(&idev->lock); 948 949 igmp6_group_dropped(ma); 950 951 ma_put(ma); 952 return 0; 953 } 954 write_unlock_bh(&idev->lock); 955 return 0; 956 } 957 } 958 write_unlock_bh(&idev->lock); 959 960 return -ENOENT; 961 } 962 963 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) 964 { 965 struct inet6_dev *idev = in6_dev_get(dev); 966 int err; 967 968 if (!idev) 969 return -ENODEV; 970 971 err = __ipv6_dev_mc_dec(idev, addr); 972 973 in6_dev_put(idev); 974 975 return err; 976 } 977 978 /* 979 * identify MLD packets for MLD filter exceptions 980 */ 981 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 982 { 983 struct icmp6hdr *pic; 984 985 if (nexthdr != IPPROTO_ICMPV6) 986 return 0; 987 988 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 989 return 0; 990 991 pic = icmp6_hdr(skb); 992 993 switch (pic->icmp6_type) { 994 case ICMPV6_MGM_QUERY: 995 case ICMPV6_MGM_REPORT: 996 case ICMPV6_MGM_REDUCTION: 997 case ICMPV6_MLD2_REPORT: 998 return 1; 999 default: 1000 break; 1001 } 1002 return 0; 1003 } 1004 1005 /* 1006 * check if the interface/address pair is valid 1007 */ 1008 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, 1009 struct in6_addr *src_addr) 1010 { 1011 struct inet6_dev *idev; 1012 struct ifmcaddr6 *mc; 1013 int rv = 0; 1014 1015 idev = in6_dev_get(dev); 1016 if (idev) { 1017 read_lock_bh(&idev->lock); 1018 for (mc = idev->mc_list; mc; mc=mc->next) { 1019 if (ipv6_addr_equal(&mc->mca_addr, group)) 1020 break; 1021 } 1022 if (mc) { 1023 if (src_addr && !ipv6_addr_any(src_addr)) { 1024 struct ip6_sf_list *psf; 1025 1026 spin_lock_bh(&mc->mca_lock); 1027 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1028 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1029 break; 1030 } 1031 if (psf) 1032 rv = psf->sf_count[MCAST_INCLUDE] || 1033 psf->sf_count[MCAST_EXCLUDE] != 1034 mc->mca_sfcount[MCAST_EXCLUDE]; 1035 else 1036 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1037 spin_unlock_bh(&mc->mca_lock); 1038 } else 1039 rv = 1; /* don't filter unspecified source */ 1040 } 1041 read_unlock_bh(&idev->lock); 1042 in6_dev_put(idev); 1043 } 1044 return rv; 1045 } 1046 1047 static void mld_gq_start_timer(struct inet6_dev *idev) 1048 { 1049 int tv = net_random() % idev->mc_maxdelay; 1050 1051 idev->mc_gq_running = 1; 1052 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1053 in6_dev_hold(idev); 1054 } 1055 1056 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1057 { 1058 int tv = net_random() % delay; 1059 1060 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1061 in6_dev_hold(idev); 1062 } 1063 1064 /* 1065 * IGMP handling (alias multicast ICMPv6 messages) 1066 */ 1067 1068 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1069 { 1070 unsigned long delay = resptime; 1071 1072 /* Do not start timer for these addresses */ 1073 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1074 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1075 return; 1076 1077 if (del_timer(&ma->mca_timer)) { 1078 atomic_dec(&ma->mca_refcnt); 1079 delay = ma->mca_timer.expires - jiffies; 1080 } 1081 1082 if (delay >= resptime) { 1083 if (resptime) 1084 delay = net_random() % resptime; 1085 else 1086 delay = 1; 1087 } 1088 ma->mca_timer.expires = jiffies + delay; 1089 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1090 atomic_inc(&ma->mca_refcnt); 1091 ma->mca_flags |= MAF_TIMER_RUNNING; 1092 } 1093 1094 /* mark EXCLUDE-mode sources */ 1095 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1096 struct in6_addr *srcs) 1097 { 1098 struct ip6_sf_list *psf; 1099 int i, scount; 1100 1101 scount = 0; 1102 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1103 if (scount == nsrcs) 1104 break; 1105 for (i=0; i<nsrcs; i++) { 1106 /* skip inactive filters */ 1107 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1108 pmc->mca_sfcount[MCAST_EXCLUDE] != 1109 psf->sf_count[MCAST_EXCLUDE]) 1110 continue; 1111 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1112 scount++; 1113 break; 1114 } 1115 } 1116 } 1117 pmc->mca_flags &= ~MAF_GSQUERY; 1118 if (scount == nsrcs) /* all sources excluded */ 1119 return 0; 1120 return 1; 1121 } 1122 1123 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1124 struct in6_addr *srcs) 1125 { 1126 struct ip6_sf_list *psf; 1127 int i, scount; 1128 1129 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1130 return mld_xmarksources(pmc, nsrcs, srcs); 1131 1132 /* mark INCLUDE-mode sources */ 1133 1134 scount = 0; 1135 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1136 if (scount == nsrcs) 1137 break; 1138 for (i=0; i<nsrcs; i++) { 1139 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1140 psf->sf_gsresp = 1; 1141 scount++; 1142 break; 1143 } 1144 } 1145 } 1146 if (!scount) { 1147 pmc->mca_flags &= ~MAF_GSQUERY; 1148 return 0; 1149 } 1150 pmc->mca_flags |= MAF_GSQUERY; 1151 return 1; 1152 } 1153 1154 int igmp6_event_query(struct sk_buff *skb) 1155 { 1156 struct mld2_query *mlh2 = NULL; 1157 struct ifmcaddr6 *ma; 1158 struct in6_addr *group; 1159 unsigned long max_delay; 1160 struct inet6_dev *idev; 1161 struct icmp6hdr *hdr; 1162 int group_type; 1163 int mark = 0; 1164 int len; 1165 1166 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1167 return -EINVAL; 1168 1169 /* compute payload length excluding extension headers */ 1170 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); 1171 len -= skb_network_header_len(skb); 1172 1173 /* Drop queries with not link local source */ 1174 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) 1175 return -EINVAL; 1176 1177 idev = in6_dev_get(skb->dev); 1178 1179 if (idev == NULL) 1180 return 0; 1181 1182 hdr = icmp6_hdr(skb); 1183 group = (struct in6_addr *) (hdr + 1); 1184 group_type = ipv6_addr_type(group); 1185 1186 if (group_type != IPV6_ADDR_ANY && 1187 !(group_type&IPV6_ADDR_MULTICAST)) { 1188 in6_dev_put(idev); 1189 return -EINVAL; 1190 } 1191 1192 if (len == 24) { 1193 int switchback; 1194 /* MLDv1 router present */ 1195 1196 /* Translate milliseconds to jiffies */ 1197 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1198 1199 switchback = (idev->mc_qrv + 1) * max_delay; 1200 idev->mc_v1_seen = jiffies + switchback; 1201 1202 /* cancel the interface change timer */ 1203 idev->mc_ifc_count = 0; 1204 if (del_timer(&idev->mc_ifc_timer)) 1205 __in6_dev_put(idev); 1206 /* clear deleted report items */ 1207 mld_clear_delrec(idev); 1208 } else if (len >= 28) { 1209 int srcs_offset = sizeof(struct mld2_query) - 1210 sizeof(struct icmp6hdr); 1211 if (!pskb_may_pull(skb, srcs_offset)) { 1212 in6_dev_put(idev); 1213 return -EINVAL; 1214 } 1215 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1216 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1217 if (!max_delay) 1218 max_delay = 1; 1219 idev->mc_maxdelay = max_delay; 1220 if (mlh2->qrv) 1221 idev->mc_qrv = mlh2->qrv; 1222 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1223 if (mlh2->nsrcs) { 1224 in6_dev_put(idev); 1225 return -EINVAL; /* no sources allowed */ 1226 } 1227 mld_gq_start_timer(idev); 1228 in6_dev_put(idev); 1229 return 0; 1230 } 1231 /* mark sources to include, if group & source-specific */ 1232 if (mlh2->nsrcs != 0) { 1233 if (!pskb_may_pull(skb, srcs_offset + 1234 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1235 in6_dev_put(idev); 1236 return -EINVAL; 1237 } 1238 mlh2 = (struct mld2_query *)skb_transport_header(skb); 1239 mark = 1; 1240 } 1241 } else { 1242 in6_dev_put(idev); 1243 return -EINVAL; 1244 } 1245 1246 read_lock_bh(&idev->lock); 1247 if (group_type == IPV6_ADDR_ANY) { 1248 for (ma = idev->mc_list; ma; ma=ma->next) { 1249 spin_lock_bh(&ma->mca_lock); 1250 igmp6_group_queried(ma, max_delay); 1251 spin_unlock_bh(&ma->mca_lock); 1252 } 1253 } else { 1254 for (ma = idev->mc_list; ma; ma=ma->next) { 1255 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1256 continue; 1257 spin_lock_bh(&ma->mca_lock); 1258 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1259 /* gsquery <- gsquery && mark */ 1260 if (!mark) 1261 ma->mca_flags &= ~MAF_GSQUERY; 1262 } else { 1263 /* gsquery <- mark */ 1264 if (mark) 1265 ma->mca_flags |= MAF_GSQUERY; 1266 else 1267 ma->mca_flags &= ~MAF_GSQUERY; 1268 } 1269 if (!(ma->mca_flags & MAF_GSQUERY) || 1270 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1271 igmp6_group_queried(ma, max_delay); 1272 spin_unlock_bh(&ma->mca_lock); 1273 break; 1274 } 1275 } 1276 read_unlock_bh(&idev->lock); 1277 in6_dev_put(idev); 1278 1279 return 0; 1280 } 1281 1282 1283 int igmp6_event_report(struct sk_buff *skb) 1284 { 1285 struct ifmcaddr6 *ma; 1286 struct in6_addr *addrp; 1287 struct inet6_dev *idev; 1288 struct icmp6hdr *hdr; 1289 int addr_type; 1290 1291 /* Our own report looped back. Ignore it. */ 1292 if (skb->pkt_type == PACKET_LOOPBACK) 1293 return 0; 1294 1295 /* send our report if the MC router may not have heard this report */ 1296 if (skb->pkt_type != PACKET_MULTICAST && 1297 skb->pkt_type != PACKET_BROADCAST) 1298 return 0; 1299 1300 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1301 return -EINVAL; 1302 1303 hdr = icmp6_hdr(skb); 1304 1305 /* Drop reports with not link local source */ 1306 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); 1307 if (addr_type != IPV6_ADDR_ANY && 1308 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1309 return -EINVAL; 1310 1311 addrp = (struct in6_addr *) (hdr + 1); 1312 1313 idev = in6_dev_get(skb->dev); 1314 if (idev == NULL) 1315 return -ENODEV; 1316 1317 /* 1318 * Cancel the timer for this group 1319 */ 1320 1321 read_lock_bh(&idev->lock); 1322 for (ma = idev->mc_list; ma; ma=ma->next) { 1323 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1324 spin_lock(&ma->mca_lock); 1325 if (del_timer(&ma->mca_timer)) 1326 atomic_dec(&ma->mca_refcnt); 1327 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1328 spin_unlock(&ma->mca_lock); 1329 break; 1330 } 1331 } 1332 read_unlock_bh(&idev->lock); 1333 in6_dev_put(idev); 1334 return 0; 1335 } 1336 1337 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1338 int gdeleted, int sdeleted) 1339 { 1340 switch (type) { 1341 case MLD2_MODE_IS_INCLUDE: 1342 case MLD2_MODE_IS_EXCLUDE: 1343 if (gdeleted || sdeleted) 1344 return 0; 1345 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1346 if (pmc->mca_sfmode == MCAST_INCLUDE) 1347 return 1; 1348 /* don't include if this source is excluded 1349 * in all filters 1350 */ 1351 if (psf->sf_count[MCAST_INCLUDE]) 1352 return type == MLD2_MODE_IS_INCLUDE; 1353 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1354 psf->sf_count[MCAST_EXCLUDE]; 1355 } 1356 return 0; 1357 case MLD2_CHANGE_TO_INCLUDE: 1358 if (gdeleted || sdeleted) 1359 return 0; 1360 return psf->sf_count[MCAST_INCLUDE] != 0; 1361 case MLD2_CHANGE_TO_EXCLUDE: 1362 if (gdeleted || sdeleted) 1363 return 0; 1364 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1365 psf->sf_count[MCAST_INCLUDE]) 1366 return 0; 1367 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1368 psf->sf_count[MCAST_EXCLUDE]; 1369 case MLD2_ALLOW_NEW_SOURCES: 1370 if (gdeleted || !psf->sf_crcount) 1371 return 0; 1372 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1373 case MLD2_BLOCK_OLD_SOURCES: 1374 if (pmc->mca_sfmode == MCAST_INCLUDE) 1375 return gdeleted || (psf->sf_crcount && sdeleted); 1376 return psf->sf_crcount && !gdeleted && !sdeleted; 1377 } 1378 return 0; 1379 } 1380 1381 static int 1382 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1383 { 1384 struct ip6_sf_list *psf; 1385 int scount = 0; 1386 1387 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1388 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1389 continue; 1390 scount++; 1391 } 1392 return scount; 1393 } 1394 1395 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1396 { 1397 struct sock *sk = igmp6_socket->sk; 1398 struct sk_buff *skb; 1399 struct mld2_report *pmr; 1400 struct in6_addr addr_buf; 1401 int err; 1402 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1403 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1404 IPV6_TLV_PADN, 0 }; 1405 1406 /* we assume size > sizeof(ra) here */ 1407 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1408 1409 if (skb == 0) 1410 return NULL; 1411 1412 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1413 1414 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1415 /* <draft-ietf-magma-mld-source-05.txt>: 1416 * use unspecified address as the source address 1417 * when a valid link-local address is not available. 1418 */ 1419 memset(&addr_buf, 0, sizeof(addr_buf)); 1420 } 1421 1422 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1423 1424 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1425 1426 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); 1427 skb_put(skb, sizeof(*pmr)); 1428 pmr = (struct mld2_report *)skb_transport_header(skb); 1429 pmr->type = ICMPV6_MLD2_REPORT; 1430 pmr->resv1 = 0; 1431 pmr->csum = 0; 1432 pmr->resv2 = 0; 1433 pmr->ngrec = 0; 1434 return skb; 1435 } 1436 1437 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1438 { 1439 struct net_device *dev = skb->dev; 1440 1441 if (dev->hard_header) { 1442 unsigned char ha[MAX_ADDR_LEN]; 1443 int err; 1444 1445 ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1); 1446 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); 1447 if (err < 0) { 1448 kfree_skb(skb); 1449 return err; 1450 } 1451 } 1452 return dev_queue_xmit(skb); 1453 } 1454 1455 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1456 { 1457 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1458 mld_dev_queue_xmit2); 1459 } 1460 1461 static void mld_sendpack(struct sk_buff *skb) 1462 { 1463 struct ipv6hdr *pip6 = ipv6_hdr(skb); 1464 struct mld2_report *pmr = 1465 (struct mld2_report *)skb_transport_header(skb); 1466 int payload_len, mldlen; 1467 struct inet6_dev *idev = in6_dev_get(skb->dev); 1468 int err; 1469 1470 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); 1471 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); 1472 mldlen = skb->tail - skb->transport_header; 1473 pip6->payload_len = htons(payload_len); 1474 1475 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1476 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), 1477 mldlen, 0)); 1478 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1479 mld_dev_queue_xmit); 1480 if (!err) { 1481 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); 1482 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); 1483 } else 1484 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); 1485 1486 if (likely(idev != NULL)) 1487 in6_dev_put(idev); 1488 } 1489 1490 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1491 { 1492 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1493 } 1494 1495 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1496 int type, struct mld2_grec **ppgr) 1497 { 1498 struct net_device *dev = pmc->idev->dev; 1499 struct mld2_report *pmr; 1500 struct mld2_grec *pgr; 1501 1502 if (!skb) 1503 skb = mld_newpack(dev, dev->mtu); 1504 if (!skb) 1505 return NULL; 1506 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1507 pgr->grec_type = type; 1508 pgr->grec_auxwords = 0; 1509 pgr->grec_nsrcs = 0; 1510 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1511 pmr = (struct mld2_report *)skb_transport_header(skb); 1512 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1513 *ppgr = pgr; 1514 return skb; 1515 } 1516 1517 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1518 skb_tailroom(skb)) : 0) 1519 1520 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1521 int type, int gdeleted, int sdeleted) 1522 { 1523 struct net_device *dev = pmc->idev->dev; 1524 struct mld2_report *pmr; 1525 struct mld2_grec *pgr = NULL; 1526 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1527 int scount, stotal, first, isquery, truncate; 1528 1529 if (pmc->mca_flags & MAF_NOREPORT) 1530 return skb; 1531 1532 isquery = type == MLD2_MODE_IS_INCLUDE || 1533 type == MLD2_MODE_IS_EXCLUDE; 1534 truncate = type == MLD2_MODE_IS_EXCLUDE || 1535 type == MLD2_CHANGE_TO_EXCLUDE; 1536 1537 stotal = scount = 0; 1538 1539 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1540 1541 if (!*psf_list) 1542 goto empty_source; 1543 1544 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; 1545 1546 /* EX and TO_EX get a fresh packet, if needed */ 1547 if (truncate) { 1548 if (pmr && pmr->ngrec && 1549 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1550 if (skb) 1551 mld_sendpack(skb); 1552 skb = mld_newpack(dev, dev->mtu); 1553 } 1554 } 1555 first = 1; 1556 psf_prev = NULL; 1557 for (psf=*psf_list; psf; psf=psf_next) { 1558 struct in6_addr *psrc; 1559 1560 psf_next = psf->sf_next; 1561 1562 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1563 psf_prev = psf; 1564 continue; 1565 } 1566 1567 /* clear marks on query responses */ 1568 if (isquery) 1569 psf->sf_gsresp = 0; 1570 1571 if (AVAILABLE(skb) < sizeof(*psrc) + 1572 first*sizeof(struct mld2_grec)) { 1573 if (truncate && !first) 1574 break; /* truncate these */ 1575 if (pgr) 1576 pgr->grec_nsrcs = htons(scount); 1577 if (skb) 1578 mld_sendpack(skb); 1579 skb = mld_newpack(dev, dev->mtu); 1580 first = 1; 1581 scount = 0; 1582 } 1583 if (first) { 1584 skb = add_grhead(skb, pmc, type, &pgr); 1585 first = 0; 1586 } 1587 if (!skb) 1588 return NULL; 1589 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1590 *psrc = psf->sf_addr; 1591 scount++; stotal++; 1592 if ((type == MLD2_ALLOW_NEW_SOURCES || 1593 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1594 psf->sf_crcount--; 1595 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1596 if (psf_prev) 1597 psf_prev->sf_next = psf->sf_next; 1598 else 1599 *psf_list = psf->sf_next; 1600 kfree(psf); 1601 continue; 1602 } 1603 } 1604 psf_prev = psf; 1605 } 1606 1607 empty_source: 1608 if (!stotal) { 1609 if (type == MLD2_ALLOW_NEW_SOURCES || 1610 type == MLD2_BLOCK_OLD_SOURCES) 1611 return skb; 1612 if (pmc->mca_crcount || isquery) { 1613 /* make sure we have room for group header */ 1614 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1615 mld_sendpack(skb); 1616 skb = NULL; /* add_grhead will get a new one */ 1617 } 1618 skb = add_grhead(skb, pmc, type, &pgr); 1619 } 1620 } 1621 if (pgr) 1622 pgr->grec_nsrcs = htons(scount); 1623 1624 if (isquery) 1625 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1626 return skb; 1627 } 1628 1629 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1630 { 1631 struct sk_buff *skb = NULL; 1632 int type; 1633 1634 if (!pmc) { 1635 read_lock_bh(&idev->lock); 1636 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1637 if (pmc->mca_flags & MAF_NOREPORT) 1638 continue; 1639 spin_lock_bh(&pmc->mca_lock); 1640 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1641 type = MLD2_MODE_IS_EXCLUDE; 1642 else 1643 type = MLD2_MODE_IS_INCLUDE; 1644 skb = add_grec(skb, pmc, type, 0, 0); 1645 spin_unlock_bh(&pmc->mca_lock); 1646 } 1647 read_unlock_bh(&idev->lock); 1648 } else { 1649 spin_lock_bh(&pmc->mca_lock); 1650 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1651 type = MLD2_MODE_IS_EXCLUDE; 1652 else 1653 type = MLD2_MODE_IS_INCLUDE; 1654 skb = add_grec(skb, pmc, type, 0, 0); 1655 spin_unlock_bh(&pmc->mca_lock); 1656 } 1657 if (skb) 1658 mld_sendpack(skb); 1659 } 1660 1661 /* 1662 * remove zero-count source records from a source filter list 1663 */ 1664 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1665 { 1666 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1667 1668 psf_prev = NULL; 1669 for (psf=*ppsf; psf; psf = psf_next) { 1670 psf_next = psf->sf_next; 1671 if (psf->sf_crcount == 0) { 1672 if (psf_prev) 1673 psf_prev->sf_next = psf->sf_next; 1674 else 1675 *ppsf = psf->sf_next; 1676 kfree(psf); 1677 } else 1678 psf_prev = psf; 1679 } 1680 } 1681 1682 static void mld_send_cr(struct inet6_dev *idev) 1683 { 1684 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1685 struct sk_buff *skb = NULL; 1686 int type, dtype; 1687 1688 read_lock_bh(&idev->lock); 1689 write_lock_bh(&idev->mc_lock); 1690 1691 /* deleted MCA's */ 1692 pmc_prev = NULL; 1693 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1694 pmc_next = pmc->next; 1695 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1696 type = MLD2_BLOCK_OLD_SOURCES; 1697 dtype = MLD2_BLOCK_OLD_SOURCES; 1698 skb = add_grec(skb, pmc, type, 1, 0); 1699 skb = add_grec(skb, pmc, dtype, 1, 1); 1700 } 1701 if (pmc->mca_crcount) { 1702 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1703 type = MLD2_CHANGE_TO_INCLUDE; 1704 skb = add_grec(skb, pmc, type, 1, 0); 1705 } 1706 pmc->mca_crcount--; 1707 if (pmc->mca_crcount == 0) { 1708 mld_clear_zeros(&pmc->mca_tomb); 1709 mld_clear_zeros(&pmc->mca_sources); 1710 } 1711 } 1712 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1713 !pmc->mca_sources) { 1714 if (pmc_prev) 1715 pmc_prev->next = pmc_next; 1716 else 1717 idev->mc_tomb = pmc_next; 1718 in6_dev_put(pmc->idev); 1719 kfree(pmc); 1720 } else 1721 pmc_prev = pmc; 1722 } 1723 write_unlock_bh(&idev->mc_lock); 1724 1725 /* change recs */ 1726 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1727 spin_lock_bh(&pmc->mca_lock); 1728 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1729 type = MLD2_BLOCK_OLD_SOURCES; 1730 dtype = MLD2_ALLOW_NEW_SOURCES; 1731 } else { 1732 type = MLD2_ALLOW_NEW_SOURCES; 1733 dtype = MLD2_BLOCK_OLD_SOURCES; 1734 } 1735 skb = add_grec(skb, pmc, type, 0, 0); 1736 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1737 1738 /* filter mode changes */ 1739 if (pmc->mca_crcount) { 1740 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1741 type = MLD2_CHANGE_TO_EXCLUDE; 1742 else 1743 type = MLD2_CHANGE_TO_INCLUDE; 1744 skb = add_grec(skb, pmc, type, 0, 0); 1745 pmc->mca_crcount--; 1746 } 1747 spin_unlock_bh(&pmc->mca_lock); 1748 } 1749 read_unlock_bh(&idev->lock); 1750 if (!skb) 1751 return; 1752 (void) mld_sendpack(skb); 1753 } 1754 1755 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1756 { 1757 struct sock *sk = igmp6_socket->sk; 1758 struct inet6_dev *idev; 1759 struct sk_buff *skb; 1760 struct icmp6hdr *hdr; 1761 struct in6_addr *snd_addr; 1762 struct in6_addr *addrp; 1763 struct in6_addr addr_buf; 1764 struct in6_addr all_routers; 1765 int err, len, payload_len, full_len; 1766 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1767 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1768 IPV6_TLV_PADN, 0 }; 1769 1770 rcu_read_lock(); 1771 IP6_INC_STATS(__in6_dev_get(dev), 1772 IPSTATS_MIB_OUTREQUESTS); 1773 rcu_read_unlock(); 1774 snd_addr = addr; 1775 if (type == ICMPV6_MGM_REDUCTION) { 1776 snd_addr = &all_routers; 1777 ipv6_addr_all_routers(&all_routers); 1778 } 1779 1780 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1781 payload_len = len + sizeof(ra); 1782 full_len = sizeof(struct ipv6hdr) + payload_len; 1783 1784 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1785 1786 if (skb == NULL) { 1787 rcu_read_lock(); 1788 IP6_INC_STATS(__in6_dev_get(dev), 1789 IPSTATS_MIB_OUTDISCARDS); 1790 rcu_read_unlock(); 1791 return; 1792 } 1793 1794 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1795 1796 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { 1797 /* <draft-ietf-magma-mld-source-05.txt>: 1798 * use unspecified address as the source address 1799 * when a valid link-local address is not available. 1800 */ 1801 memset(&addr_buf, 0, sizeof(addr_buf)); 1802 } 1803 1804 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1805 1806 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1807 1808 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1809 memset(hdr, 0, sizeof(struct icmp6hdr)); 1810 hdr->icmp6_type = type; 1811 1812 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1813 ipv6_addr_copy(addrp, addr); 1814 1815 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1816 IPPROTO_ICMPV6, 1817 csum_partial((__u8 *) hdr, len, 0)); 1818 1819 idev = in6_dev_get(skb->dev); 1820 1821 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1822 mld_dev_queue_xmit); 1823 if (!err) { 1824 if (type == ICMPV6_MGM_REDUCTION) 1825 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); 1826 else 1827 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); 1828 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1829 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); 1830 } else 1831 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); 1832 1833 if (likely(idev != NULL)) 1834 in6_dev_put(idev); 1835 return; 1836 } 1837 1838 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1839 struct in6_addr *psfsrc) 1840 { 1841 struct ip6_sf_list *psf, *psf_prev; 1842 int rv = 0; 1843 1844 psf_prev = NULL; 1845 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1846 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1847 break; 1848 psf_prev = psf; 1849 } 1850 if (!psf || psf->sf_count[sfmode] == 0) { 1851 /* source filter not found, or count wrong => bug */ 1852 return -ESRCH; 1853 } 1854 psf->sf_count[sfmode]--; 1855 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1856 struct inet6_dev *idev = pmc->idev; 1857 1858 /* no more filters for this source */ 1859 if (psf_prev) 1860 psf_prev->sf_next = psf->sf_next; 1861 else 1862 pmc->mca_sources = psf->sf_next; 1863 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1864 !MLD_V1_SEEN(idev)) { 1865 psf->sf_crcount = idev->mc_qrv; 1866 psf->sf_next = pmc->mca_tomb; 1867 pmc->mca_tomb = psf; 1868 rv = 1; 1869 } else 1870 kfree(psf); 1871 } 1872 return rv; 1873 } 1874 1875 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1876 int sfmode, int sfcount, struct in6_addr *psfsrc, 1877 int delta) 1878 { 1879 struct ifmcaddr6 *pmc; 1880 int changerec = 0; 1881 int i, err; 1882 1883 if (!idev) 1884 return -ENODEV; 1885 read_lock_bh(&idev->lock); 1886 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1887 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1888 break; 1889 } 1890 if (!pmc) { 1891 /* MCA not found?? bug */ 1892 read_unlock_bh(&idev->lock); 1893 return -ESRCH; 1894 } 1895 spin_lock_bh(&pmc->mca_lock); 1896 sf_markstate(pmc); 1897 if (!delta) { 1898 if (!pmc->mca_sfcount[sfmode]) { 1899 spin_unlock_bh(&pmc->mca_lock); 1900 read_unlock_bh(&idev->lock); 1901 return -EINVAL; 1902 } 1903 pmc->mca_sfcount[sfmode]--; 1904 } 1905 err = 0; 1906 for (i=0; i<sfcount; i++) { 1907 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1908 1909 changerec |= rv > 0; 1910 if (!err && rv < 0) 1911 err = rv; 1912 } 1913 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1914 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1915 pmc->mca_sfcount[MCAST_INCLUDE]) { 1916 struct ip6_sf_list *psf; 1917 1918 /* filter mode change */ 1919 pmc->mca_sfmode = MCAST_INCLUDE; 1920 pmc->mca_crcount = idev->mc_qrv; 1921 idev->mc_ifc_count = pmc->mca_crcount; 1922 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1923 psf->sf_crcount = 0; 1924 mld_ifc_event(pmc->idev); 1925 } else if (sf_setstate(pmc) || changerec) 1926 mld_ifc_event(pmc->idev); 1927 spin_unlock_bh(&pmc->mca_lock); 1928 read_unlock_bh(&idev->lock); 1929 return err; 1930 } 1931 1932 /* 1933 * Add multicast single-source filter to the interface list 1934 */ 1935 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1936 struct in6_addr *psfsrc, int delta) 1937 { 1938 struct ip6_sf_list *psf, *psf_prev; 1939 1940 psf_prev = NULL; 1941 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1942 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1943 break; 1944 psf_prev = psf; 1945 } 1946 if (!psf) { 1947 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1948 if (!psf) 1949 return -ENOBUFS; 1950 1951 psf->sf_addr = *psfsrc; 1952 if (psf_prev) { 1953 psf_prev->sf_next = psf; 1954 } else 1955 pmc->mca_sources = psf; 1956 } 1957 psf->sf_count[sfmode]++; 1958 return 0; 1959 } 1960 1961 static void sf_markstate(struct ifmcaddr6 *pmc) 1962 { 1963 struct ip6_sf_list *psf; 1964 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1965 1966 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1967 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1968 psf->sf_oldin = mca_xcount == 1969 psf->sf_count[MCAST_EXCLUDE] && 1970 !psf->sf_count[MCAST_INCLUDE]; 1971 } else 1972 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1973 } 1974 1975 static int sf_setstate(struct ifmcaddr6 *pmc) 1976 { 1977 struct ip6_sf_list *psf, *dpsf; 1978 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1979 int qrv = pmc->idev->mc_qrv; 1980 int new_in, rv; 1981 1982 rv = 0; 1983 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1984 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1985 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1986 !psf->sf_count[MCAST_INCLUDE]; 1987 } else 1988 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1989 if (new_in) { 1990 if (!psf->sf_oldin) { 1991 struct ip6_sf_list *prev = NULL; 1992 1993 for (dpsf=pmc->mca_tomb; dpsf; 1994 dpsf=dpsf->sf_next) { 1995 if (ipv6_addr_equal(&dpsf->sf_addr, 1996 &psf->sf_addr)) 1997 break; 1998 prev = dpsf; 1999 } 2000 if (dpsf) { 2001 if (prev) 2002 prev->sf_next = dpsf->sf_next; 2003 else 2004 pmc->mca_tomb = dpsf->sf_next; 2005 kfree(dpsf); 2006 } 2007 psf->sf_crcount = qrv; 2008 rv++; 2009 } 2010 } else if (psf->sf_oldin) { 2011 psf->sf_crcount = 0; 2012 /* 2013 * add or update "delete" records if an active filter 2014 * is now inactive 2015 */ 2016 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2017 if (ipv6_addr_equal(&dpsf->sf_addr, 2018 &psf->sf_addr)) 2019 break; 2020 if (!dpsf) { 2021 dpsf = (struct ip6_sf_list *) 2022 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2023 if (!dpsf) 2024 continue; 2025 *dpsf = *psf; 2026 /* pmc->mca_lock held by callers */ 2027 dpsf->sf_next = pmc->mca_tomb; 2028 pmc->mca_tomb = dpsf; 2029 } 2030 dpsf->sf_crcount = qrv; 2031 rv++; 2032 } 2033 } 2034 return rv; 2035 } 2036 2037 /* 2038 * Add multicast source filter list to the interface list 2039 */ 2040 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2041 int sfmode, int sfcount, struct in6_addr *psfsrc, 2042 int delta) 2043 { 2044 struct ifmcaddr6 *pmc; 2045 int isexclude; 2046 int i, err; 2047 2048 if (!idev) 2049 return -ENODEV; 2050 read_lock_bh(&idev->lock); 2051 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2052 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2053 break; 2054 } 2055 if (!pmc) { 2056 /* MCA not found?? bug */ 2057 read_unlock_bh(&idev->lock); 2058 return -ESRCH; 2059 } 2060 spin_lock_bh(&pmc->mca_lock); 2061 2062 sf_markstate(pmc); 2063 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2064 if (!delta) 2065 pmc->mca_sfcount[sfmode]++; 2066 err = 0; 2067 for (i=0; i<sfcount; i++) { 2068 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2069 if (err) 2070 break; 2071 } 2072 if (err) { 2073 int j; 2074 2075 if (!delta) 2076 pmc->mca_sfcount[sfmode]--; 2077 for (j=0; j<i; j++) 2078 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2079 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2080 struct inet6_dev *idev = pmc->idev; 2081 struct ip6_sf_list *psf; 2082 2083 /* filter mode change */ 2084 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2085 pmc->mca_sfmode = MCAST_EXCLUDE; 2086 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2087 pmc->mca_sfmode = MCAST_INCLUDE; 2088 /* else no filters; keep old mode for reports */ 2089 2090 pmc->mca_crcount = idev->mc_qrv; 2091 idev->mc_ifc_count = pmc->mca_crcount; 2092 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2093 psf->sf_crcount = 0; 2094 mld_ifc_event(idev); 2095 } else if (sf_setstate(pmc)) 2096 mld_ifc_event(idev); 2097 spin_unlock_bh(&pmc->mca_lock); 2098 read_unlock_bh(&idev->lock); 2099 return err; 2100 } 2101 2102 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2103 { 2104 struct ip6_sf_list *psf, *nextpsf; 2105 2106 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2107 nextpsf = psf->sf_next; 2108 kfree(psf); 2109 } 2110 pmc->mca_tomb = NULL; 2111 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2112 nextpsf = psf->sf_next; 2113 kfree(psf); 2114 } 2115 pmc->mca_sources = NULL; 2116 pmc->mca_sfmode = MCAST_EXCLUDE; 2117 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2118 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2119 } 2120 2121 2122 static void igmp6_join_group(struct ifmcaddr6 *ma) 2123 { 2124 unsigned long delay; 2125 2126 if (ma->mca_flags & MAF_NOREPORT) 2127 return; 2128 2129 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2130 2131 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2132 2133 spin_lock_bh(&ma->mca_lock); 2134 if (del_timer(&ma->mca_timer)) { 2135 atomic_dec(&ma->mca_refcnt); 2136 delay = ma->mca_timer.expires - jiffies; 2137 } 2138 2139 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2140 atomic_inc(&ma->mca_refcnt); 2141 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2142 spin_unlock_bh(&ma->mca_lock); 2143 } 2144 2145 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2146 struct inet6_dev *idev) 2147 { 2148 int err; 2149 2150 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2151 * so no other readers or writers of iml or its sflist 2152 */ 2153 if (iml->sflist == 0) { 2154 /* any-source empty exclude case */ 2155 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2156 } 2157 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2158 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2159 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2160 iml->sflist = NULL; 2161 return err; 2162 } 2163 2164 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2165 { 2166 if (MLD_V1_SEEN(ma->idev)) { 2167 if (ma->mca_flags & MAF_LAST_REPORTER) 2168 igmp6_send(&ma->mca_addr, ma->idev->dev, 2169 ICMPV6_MGM_REDUCTION); 2170 } else { 2171 mld_add_delrec(ma->idev, ma); 2172 mld_ifc_event(ma->idev); 2173 } 2174 } 2175 2176 static void mld_gq_timer_expire(unsigned long data) 2177 { 2178 struct inet6_dev *idev = (struct inet6_dev *)data; 2179 2180 idev->mc_gq_running = 0; 2181 mld_send_report(idev, NULL); 2182 __in6_dev_put(idev); 2183 } 2184 2185 static void mld_ifc_timer_expire(unsigned long data) 2186 { 2187 struct inet6_dev *idev = (struct inet6_dev *)data; 2188 2189 mld_send_cr(idev); 2190 if (idev->mc_ifc_count) { 2191 idev->mc_ifc_count--; 2192 if (idev->mc_ifc_count) 2193 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2194 } 2195 __in6_dev_put(idev); 2196 } 2197 2198 static void mld_ifc_event(struct inet6_dev *idev) 2199 { 2200 if (MLD_V1_SEEN(idev)) 2201 return; 2202 idev->mc_ifc_count = idev->mc_qrv; 2203 mld_ifc_start_timer(idev, 1); 2204 } 2205 2206 2207 static void igmp6_timer_handler(unsigned long data) 2208 { 2209 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2210 2211 if (MLD_V1_SEEN(ma->idev)) 2212 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2213 else 2214 mld_send_report(ma->idev, ma); 2215 2216 spin_lock(&ma->mca_lock); 2217 ma->mca_flags |= MAF_LAST_REPORTER; 2218 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2219 spin_unlock(&ma->mca_lock); 2220 ma_put(ma); 2221 } 2222 2223 /* Device going down */ 2224 2225 void ipv6_mc_down(struct inet6_dev *idev) 2226 { 2227 struct ifmcaddr6 *i; 2228 2229 /* Withdraw multicast list */ 2230 2231 read_lock_bh(&idev->lock); 2232 idev->mc_ifc_count = 0; 2233 if (del_timer(&idev->mc_ifc_timer)) 2234 __in6_dev_put(idev); 2235 idev->mc_gq_running = 0; 2236 if (del_timer(&idev->mc_gq_timer)) 2237 __in6_dev_put(idev); 2238 2239 for (i = idev->mc_list; i; i=i->next) 2240 igmp6_group_dropped(i); 2241 read_unlock_bh(&idev->lock); 2242 2243 mld_clear_delrec(idev); 2244 } 2245 2246 2247 /* Device going up */ 2248 2249 void ipv6_mc_up(struct inet6_dev *idev) 2250 { 2251 struct ifmcaddr6 *i; 2252 2253 /* Install multicast list, except for all-nodes (already installed) */ 2254 2255 read_lock_bh(&idev->lock); 2256 for (i = idev->mc_list; i; i=i->next) 2257 igmp6_group_added(i); 2258 read_unlock_bh(&idev->lock); 2259 } 2260 2261 /* IPv6 device initialization. */ 2262 2263 void ipv6_mc_init_dev(struct inet6_dev *idev) 2264 { 2265 write_lock_bh(&idev->lock); 2266 rwlock_init(&idev->mc_lock); 2267 idev->mc_gq_running = 0; 2268 init_timer(&idev->mc_gq_timer); 2269 idev->mc_gq_timer.data = (unsigned long) idev; 2270 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2271 idev->mc_tomb = NULL; 2272 idev->mc_ifc_count = 0; 2273 init_timer(&idev->mc_ifc_timer); 2274 idev->mc_ifc_timer.data = (unsigned long) idev; 2275 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2276 idev->mc_qrv = MLD_QRV_DEFAULT; 2277 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2278 idev->mc_v1_seen = 0; 2279 write_unlock_bh(&idev->lock); 2280 } 2281 2282 /* 2283 * Device is about to be destroyed: clean up. 2284 */ 2285 2286 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2287 { 2288 struct ifmcaddr6 *i; 2289 struct in6_addr maddr; 2290 2291 /* Deactivate timers */ 2292 ipv6_mc_down(idev); 2293 2294 /* Delete all-nodes address. */ 2295 ipv6_addr_all_nodes(&maddr); 2296 2297 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2298 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2299 * fail. 2300 */ 2301 __ipv6_dev_mc_dec(idev, &maddr); 2302 2303 if (idev->cnf.forwarding) { 2304 ipv6_addr_all_routers(&maddr); 2305 __ipv6_dev_mc_dec(idev, &maddr); 2306 } 2307 2308 write_lock_bh(&idev->lock); 2309 while ((i = idev->mc_list) != NULL) { 2310 idev->mc_list = i->next; 2311 write_unlock_bh(&idev->lock); 2312 2313 igmp6_group_dropped(i); 2314 ma_put(i); 2315 2316 write_lock_bh(&idev->lock); 2317 } 2318 write_unlock_bh(&idev->lock); 2319 } 2320 2321 #ifdef CONFIG_PROC_FS 2322 struct igmp6_mc_iter_state { 2323 struct net_device *dev; 2324 struct inet6_dev *idev; 2325 }; 2326 2327 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2328 2329 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2330 { 2331 struct ifmcaddr6 *im = NULL; 2332 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2333 2334 state->idev = NULL; 2335 for_each_netdev(state->dev) { 2336 struct inet6_dev *idev; 2337 idev = in6_dev_get(state->dev); 2338 if (!idev) 2339 continue; 2340 read_lock_bh(&idev->lock); 2341 im = idev->mc_list; 2342 if (im) { 2343 state->idev = idev; 2344 break; 2345 } 2346 read_unlock_bh(&idev->lock); 2347 in6_dev_put(idev); 2348 } 2349 return im; 2350 } 2351 2352 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2353 { 2354 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2355 2356 im = im->next; 2357 while (!im) { 2358 if (likely(state->idev != NULL)) { 2359 read_unlock_bh(&state->idev->lock); 2360 in6_dev_put(state->idev); 2361 } 2362 state->dev = next_net_device(state->dev); 2363 if (!state->dev) { 2364 state->idev = NULL; 2365 break; 2366 } 2367 state->idev = in6_dev_get(state->dev); 2368 if (!state->idev) 2369 continue; 2370 read_lock_bh(&state->idev->lock); 2371 im = state->idev->mc_list; 2372 } 2373 return im; 2374 } 2375 2376 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2377 { 2378 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2379 if (im) 2380 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2381 --pos; 2382 return pos ? NULL : im; 2383 } 2384 2385 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2386 { 2387 read_lock(&dev_base_lock); 2388 return igmp6_mc_get_idx(seq, *pos); 2389 } 2390 2391 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2392 { 2393 struct ifmcaddr6 *im; 2394 im = igmp6_mc_get_next(seq, v); 2395 ++*pos; 2396 return im; 2397 } 2398 2399 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2400 { 2401 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2402 if (likely(state->idev != NULL)) { 2403 read_unlock_bh(&state->idev->lock); 2404 in6_dev_put(state->idev); 2405 state->idev = NULL; 2406 } 2407 state->dev = NULL; 2408 read_unlock(&dev_base_lock); 2409 } 2410 2411 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2412 { 2413 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2414 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2415 2416 seq_printf(seq, 2417 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2418 state->dev->ifindex, state->dev->name, 2419 NIP6(im->mca_addr), 2420 im->mca_users, im->mca_flags, 2421 (im->mca_flags&MAF_TIMER_RUNNING) ? 2422 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2423 return 0; 2424 } 2425 2426 static struct seq_operations igmp6_mc_seq_ops = { 2427 .start = igmp6_mc_seq_start, 2428 .next = igmp6_mc_seq_next, 2429 .stop = igmp6_mc_seq_stop, 2430 .show = igmp6_mc_seq_show, 2431 }; 2432 2433 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2434 { 2435 struct seq_file *seq; 2436 int rc = -ENOMEM; 2437 struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2438 2439 if (!s) 2440 goto out; 2441 2442 rc = seq_open(file, &igmp6_mc_seq_ops); 2443 if (rc) 2444 goto out_kfree; 2445 2446 seq = file->private_data; 2447 seq->private = s; 2448 out: 2449 return rc; 2450 out_kfree: 2451 kfree(s); 2452 goto out; 2453 } 2454 2455 static const struct file_operations igmp6_mc_seq_fops = { 2456 .owner = THIS_MODULE, 2457 .open = igmp6_mc_seq_open, 2458 .read = seq_read, 2459 .llseek = seq_lseek, 2460 .release = seq_release_private, 2461 }; 2462 2463 struct igmp6_mcf_iter_state { 2464 struct net_device *dev; 2465 struct inet6_dev *idev; 2466 struct ifmcaddr6 *im; 2467 }; 2468 2469 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2470 2471 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2472 { 2473 struct ip6_sf_list *psf = NULL; 2474 struct ifmcaddr6 *im = NULL; 2475 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2476 2477 state->idev = NULL; 2478 state->im = NULL; 2479 for_each_netdev(state->dev) { 2480 struct inet6_dev *idev; 2481 idev = in6_dev_get(state->dev); 2482 if (unlikely(idev == NULL)) 2483 continue; 2484 read_lock_bh(&idev->lock); 2485 im = idev->mc_list; 2486 if (likely(im != NULL)) { 2487 spin_lock_bh(&im->mca_lock); 2488 psf = im->mca_sources; 2489 if (likely(psf != NULL)) { 2490 state->im = im; 2491 state->idev = idev; 2492 break; 2493 } 2494 spin_unlock_bh(&im->mca_lock); 2495 } 2496 read_unlock_bh(&idev->lock); 2497 in6_dev_put(idev); 2498 } 2499 return psf; 2500 } 2501 2502 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2503 { 2504 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2505 2506 psf = psf->sf_next; 2507 while (!psf) { 2508 spin_unlock_bh(&state->im->mca_lock); 2509 state->im = state->im->next; 2510 while (!state->im) { 2511 if (likely(state->idev != NULL)) { 2512 read_unlock_bh(&state->idev->lock); 2513 in6_dev_put(state->idev); 2514 } 2515 state->dev = next_net_device(state->dev); 2516 if (!state->dev) { 2517 state->idev = NULL; 2518 goto out; 2519 } 2520 state->idev = in6_dev_get(state->dev); 2521 if (!state->idev) 2522 continue; 2523 read_lock_bh(&state->idev->lock); 2524 state->im = state->idev->mc_list; 2525 } 2526 if (!state->im) 2527 break; 2528 spin_lock_bh(&state->im->mca_lock); 2529 psf = state->im->mca_sources; 2530 } 2531 out: 2532 return psf; 2533 } 2534 2535 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2536 { 2537 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2538 if (psf) 2539 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2540 --pos; 2541 return pos ? NULL : psf; 2542 } 2543 2544 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2545 { 2546 read_lock(&dev_base_lock); 2547 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2548 } 2549 2550 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2551 { 2552 struct ip6_sf_list *psf; 2553 if (v == SEQ_START_TOKEN) 2554 psf = igmp6_mcf_get_first(seq); 2555 else 2556 psf = igmp6_mcf_get_next(seq, v); 2557 ++*pos; 2558 return psf; 2559 } 2560 2561 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2562 { 2563 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2564 if (likely(state->im != NULL)) { 2565 spin_unlock_bh(&state->im->mca_lock); 2566 state->im = NULL; 2567 } 2568 if (likely(state->idev != NULL)) { 2569 read_unlock_bh(&state->idev->lock); 2570 in6_dev_put(state->idev); 2571 state->idev = NULL; 2572 } 2573 state->dev = NULL; 2574 read_unlock(&dev_base_lock); 2575 } 2576 2577 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2578 { 2579 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2580 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2581 2582 if (v == SEQ_START_TOKEN) { 2583 seq_printf(seq, 2584 "%3s %6s " 2585 "%32s %32s %6s %6s\n", "Idx", 2586 "Device", "Multicast Address", 2587 "Source Address", "INC", "EXC"); 2588 } else { 2589 seq_printf(seq, 2590 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n", 2591 state->dev->ifindex, state->dev->name, 2592 NIP6(state->im->mca_addr), 2593 NIP6(psf->sf_addr), 2594 psf->sf_count[MCAST_INCLUDE], 2595 psf->sf_count[MCAST_EXCLUDE]); 2596 } 2597 return 0; 2598 } 2599 2600 static struct seq_operations igmp6_mcf_seq_ops = { 2601 .start = igmp6_mcf_seq_start, 2602 .next = igmp6_mcf_seq_next, 2603 .stop = igmp6_mcf_seq_stop, 2604 .show = igmp6_mcf_seq_show, 2605 }; 2606 2607 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2608 { 2609 struct seq_file *seq; 2610 int rc = -ENOMEM; 2611 struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2612 2613 if (!s) 2614 goto out; 2615 2616 rc = seq_open(file, &igmp6_mcf_seq_ops); 2617 if (rc) 2618 goto out_kfree; 2619 2620 seq = file->private_data; 2621 seq->private = s; 2622 out: 2623 return rc; 2624 out_kfree: 2625 kfree(s); 2626 goto out; 2627 } 2628 2629 static const struct file_operations igmp6_mcf_seq_fops = { 2630 .owner = THIS_MODULE, 2631 .open = igmp6_mcf_seq_open, 2632 .read = seq_read, 2633 .llseek = seq_lseek, 2634 .release = seq_release_private, 2635 }; 2636 #endif 2637 2638 int __init igmp6_init(struct net_proto_family *ops) 2639 { 2640 struct ipv6_pinfo *np; 2641 struct sock *sk; 2642 int err; 2643 2644 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2645 if (err < 0) { 2646 printk(KERN_ERR 2647 "Failed to initialize the IGMP6 control socket (err %d).\n", 2648 err); 2649 igmp6_socket = NULL; /* For safety. */ 2650 return err; 2651 } 2652 2653 sk = igmp6_socket->sk; 2654 sk->sk_allocation = GFP_ATOMIC; 2655 sk->sk_prot->unhash(sk); 2656 2657 np = inet6_sk(sk); 2658 np->hop_limit = 1; 2659 2660 #ifdef CONFIG_PROC_FS 2661 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2662 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2663 #endif 2664 2665 return 0; 2666 } 2667 2668 void igmp6_cleanup(void) 2669 { 2670 sock_release(igmp6_socket); 2671 igmp6_socket = NULL; /* for safety */ 2672 2673 #ifdef CONFIG_PROC_FS 2674 proc_net_remove("mcfilter6"); 2675 proc_net_remove("igmp6"); 2676 #endif 2677 } 2678