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/config.h> 32 #include <linux/module.h> 33 #include <linux/errno.h> 34 #include <linux/types.h> 35 #include <linux/string.h> 36 #include <linux/socket.h> 37 #include <linux/sockios.h> 38 #include <linux/jiffies.h> 39 #include <linux/times.h> 40 #include <linux/net.h> 41 #include <linux/in.h> 42 #include <linux/in6.h> 43 #include <linux/netdevice.h> 44 #include <linux/if_arp.h> 45 #include <linux/route.h> 46 #include <linux/init.h> 47 #include <linux/proc_fs.h> 48 #include <linux/seq_file.h> 49 50 #include <linux/netfilter.h> 51 #include <linux/netfilter_ipv6.h> 52 53 #include <net/sock.h> 54 #include <net/snmp.h> 55 56 #include <net/ipv6.h> 57 #include <net/protocol.h> 58 #include <net/if_inet6.h> 59 #include <net/ndisc.h> 60 #include <net/addrconf.h> 61 #include <net/ip6_route.h> 62 63 #include <net/ip6_checksum.h> 64 65 /* Set to 3 to get tracing... */ 66 #define MCAST_DEBUG 2 67 68 #if MCAST_DEBUG >= 3 69 #define MDBG(x) printk x 70 #else 71 #define MDBG(x) 72 #endif 73 74 /* 75 * These header formats should be in a separate include file, but icmpv6.h 76 * doesn't have in6_addr defined in all cases, there is no __u128, and no 77 * other files reference these. 78 * 79 * +-DLS 4/14/03 80 */ 81 82 /* Multicast Listener Discovery version 2 headers */ 83 84 struct mld2_grec { 85 __u8 grec_type; 86 __u8 grec_auxwords; 87 __u16 grec_nsrcs; 88 struct in6_addr grec_mca; 89 struct in6_addr grec_src[0]; 90 }; 91 92 struct mld2_report { 93 __u8 type; 94 __u8 resv1; 95 __u16 csum; 96 __u16 resv2; 97 __u16 ngrec; 98 struct mld2_grec grec[0]; 99 }; 100 101 struct mld2_query { 102 __u8 type; 103 __u8 code; 104 __u16 csum; 105 __u16 mrc; 106 __u16 resv1; 107 struct in6_addr mca; 108 #if defined(__LITTLE_ENDIAN_BITFIELD) 109 __u8 qrv:3, 110 suppress:1, 111 resv2:4; 112 #elif defined(__BIG_ENDIAN_BITFIELD) 113 __u8 resv2:4, 114 suppress:1, 115 qrv:3; 116 #else 117 #error "Please fix <asm/byteorder.h>" 118 #endif 119 __u8 qqic; 120 __u16 nsrcs; 121 struct in6_addr srcs[0]; 122 }; 123 124 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 125 126 /* Big mc list lock for all the sockets */ 127 static DEFINE_RWLOCK(ipv6_sk_mc_lock); 128 129 static struct socket *igmp6_socket; 130 131 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr); 132 133 static void igmp6_join_group(struct ifmcaddr6 *ma); 134 static void igmp6_leave_group(struct ifmcaddr6 *ma); 135 static void igmp6_timer_handler(unsigned long data); 136 137 static void mld_gq_timer_expire(unsigned long data); 138 static void mld_ifc_timer_expire(unsigned long data); 139 static void mld_ifc_event(struct inet6_dev *idev); 140 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 141 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 142 static void mld_clear_delrec(struct inet6_dev *idev); 143 static int sf_setstate(struct ifmcaddr6 *pmc); 144 static void sf_markstate(struct ifmcaddr6 *pmc); 145 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 146 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 147 int sfmode, int sfcount, struct in6_addr *psfsrc, 148 int delta); 149 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 150 int sfmode, int sfcount, struct in6_addr *psfsrc, 151 int delta); 152 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 153 struct inet6_dev *idev); 154 155 156 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 157 #define MLD_QRV_DEFAULT 2 158 159 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \ 160 (idev)->cnf.force_mld_version == 1 || \ 161 ((idev)->mc_v1_seen && \ 162 time_before(jiffies, (idev)->mc_v1_seen))) 163 164 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 165 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 166 ((value) < (thresh) ? (value) : \ 167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \ 168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 169 170 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) 171 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) 172 173 #define IPV6_MLD_MAX_MSF 64 174 175 int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF; 176 177 /* 178 * socket join on multicast group 179 */ 180 181 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr) 182 { 183 struct net_device *dev = NULL; 184 struct ipv6_mc_socklist *mc_lst; 185 struct ipv6_pinfo *np = inet6_sk(sk); 186 int err; 187 188 if (!ipv6_addr_is_multicast(addr)) 189 return -EINVAL; 190 191 read_lock_bh(&ipv6_sk_mc_lock); 192 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 193 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 194 ipv6_addr_equal(&mc_lst->addr, addr)) { 195 read_unlock_bh(&ipv6_sk_mc_lock); 196 return -EADDRINUSE; 197 } 198 } 199 read_unlock_bh(&ipv6_sk_mc_lock); 200 201 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 202 203 if (mc_lst == NULL) 204 return -ENOMEM; 205 206 mc_lst->next = NULL; 207 ipv6_addr_copy(&mc_lst->addr, addr); 208 209 if (ifindex == 0) { 210 struct rt6_info *rt; 211 rt = rt6_lookup(addr, NULL, 0, 0); 212 if (rt) { 213 dev = rt->rt6i_dev; 214 dev_hold(dev); 215 dst_release(&rt->u.dst); 216 } 217 } else 218 dev = dev_get_by_index(ifindex); 219 220 if (dev == NULL) { 221 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 222 return -ENODEV; 223 } 224 225 mc_lst->ifindex = dev->ifindex; 226 mc_lst->sfmode = MCAST_EXCLUDE; 227 rwlock_init(&mc_lst->sflock); 228 mc_lst->sflist = NULL; 229 230 /* 231 * now add/increase the group membership on the device 232 */ 233 234 err = ipv6_dev_mc_inc(dev, addr); 235 236 if (err) { 237 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 238 dev_put(dev); 239 return err; 240 } 241 242 write_lock_bh(&ipv6_sk_mc_lock); 243 mc_lst->next = np->ipv6_mc_list; 244 np->ipv6_mc_list = mc_lst; 245 write_unlock_bh(&ipv6_sk_mc_lock); 246 247 dev_put(dev); 248 249 return 0; 250 } 251 252 /* 253 * socket leave on multicast group 254 */ 255 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr) 256 { 257 struct ipv6_pinfo *np = inet6_sk(sk); 258 struct ipv6_mc_socklist *mc_lst, **lnk; 259 260 write_lock_bh(&ipv6_sk_mc_lock); 261 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { 262 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 263 ipv6_addr_equal(&mc_lst->addr, addr)) { 264 struct net_device *dev; 265 266 *lnk = mc_lst->next; 267 write_unlock_bh(&ipv6_sk_mc_lock); 268 269 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) { 270 struct inet6_dev *idev = in6_dev_get(dev); 271 272 if (idev) { 273 (void) ip6_mc_leave_src(sk,mc_lst,idev); 274 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 275 in6_dev_put(idev); 276 } 277 dev_put(dev); 278 } 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 if (idev) { 339 (void) ip6_mc_leave_src(sk, mc_lst, idev); 340 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 341 in6_dev_put(idev); 342 } 343 dev_put(dev); 344 } 345 346 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 347 348 write_lock_bh(&ipv6_sk_mc_lock); 349 } 350 write_unlock_bh(&ipv6_sk_mc_lock); 351 } 352 353 int ip6_mc_source(int add, int omode, struct sock *sk, 354 struct group_source_req *pgsr) 355 { 356 struct in6_addr *source, *group; 357 struct ipv6_mc_socklist *pmc; 358 struct net_device *dev; 359 struct inet6_dev *idev; 360 struct ipv6_pinfo *inet6 = inet6_sk(sk); 361 struct ip6_sf_socklist *psl; 362 int i, j, rv; 363 int leavegroup = 0; 364 int pmclocked = 0; 365 int err; 366 367 if (pgsr->gsr_group.ss_family != AF_INET6 || 368 pgsr->gsr_source.ss_family != AF_INET6) 369 return -EINVAL; 370 371 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 372 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 373 374 if (!ipv6_addr_is_multicast(group)) 375 return -EINVAL; 376 377 idev = ip6_mc_find_dev(group, pgsr->gsr_interface); 378 if (!idev) 379 return -ENODEV; 380 dev = idev->dev; 381 382 err = -EADDRNOTAVAIL; 383 384 read_lock_bh(&ipv6_sk_mc_lock); 385 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 386 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 387 continue; 388 if (ipv6_addr_equal(&pmc->addr, group)) 389 break; 390 } 391 if (!pmc) { /* must have a prior join */ 392 err = -EINVAL; 393 goto done; 394 } 395 /* if a source filter was set, must be the same mode as before */ 396 if (pmc->sflist) { 397 if (pmc->sfmode != omode) { 398 err = -EINVAL; 399 goto done; 400 } 401 } else if (pmc->sfmode != omode) { 402 /* allow mode switches for empty-set filters */ 403 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 404 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 405 pmc->sfmode = omode; 406 } 407 408 write_lock_bh(&pmc->sflock); 409 pmclocked = 1; 410 411 psl = pmc->sflist; 412 if (!add) { 413 if (!psl) 414 goto done; /* err = -EADDRNOTAVAIL */ 415 rv = !0; 416 for (i=0; i<psl->sl_count; i++) { 417 rv = memcmp(&psl->sl_addr[i], source, 418 sizeof(struct in6_addr)); 419 if (rv == 0) 420 break; 421 } 422 if (rv) /* source not found */ 423 goto done; /* err = -EADDRNOTAVAIL */ 424 425 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 426 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 427 leavegroup = 1; 428 goto done; 429 } 430 431 /* update the interface filter */ 432 ip6_mc_del_src(idev, group, omode, 1, source, 1); 433 434 for (j=i+1; j<psl->sl_count; j++) 435 psl->sl_addr[j-1] = psl->sl_addr[j]; 436 psl->sl_count--; 437 err = 0; 438 goto done; 439 } 440 /* else, add a new source to the filter */ 441 442 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 443 err = -ENOBUFS; 444 goto done; 445 } 446 if (!psl || psl->sl_count == psl->sl_max) { 447 struct ip6_sf_socklist *newpsl; 448 int count = IP6_SFBLOCK; 449 450 if (psl) 451 count += psl->sl_max; 452 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk, 453 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 = (struct ip6_sf_socklist *)sock_kmalloc(sk, 539 IP6_SFLSIZE(gsf->gf_numsrc), 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 = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC); 772 if (!pmc) 773 return; 774 memset(pmc, 0, sizeof(*pmc)); 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 = kmalloc(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 memset(mc, 0, sizeof(struct ifmcaddr6)); 906 init_timer(&mc->mca_timer); 907 mc->mca_timer.function = igmp6_timer_handler; 908 mc->mca_timer.data = (unsigned long) mc; 909 910 ipv6_addr_copy(&mc->mca_addr, addr); 911 mc->idev = idev; 912 mc->mca_users = 1; 913 /* mca_stamp should be updated upon changes */ 914 mc->mca_cstamp = mc->mca_tstamp = jiffies; 915 atomic_set(&mc->mca_refcnt, 2); 916 spin_lock_init(&mc->mca_lock); 917 918 /* initial mode is (EX, empty) */ 919 mc->mca_sfmode = MCAST_EXCLUDE; 920 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 921 922 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 923 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 924 mc->mca_flags |= MAF_NOREPORT; 925 926 mc->next = idev->mc_list; 927 idev->mc_list = mc; 928 write_unlock_bh(&idev->lock); 929 930 mld_del_delrec(idev, &mc->mca_addr); 931 igmp6_group_added(mc); 932 ma_put(mc); 933 return 0; 934 } 935 936 /* 937 * device multicast group del 938 */ 939 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) 940 { 941 struct ifmcaddr6 *ma, **map; 942 943 write_lock_bh(&idev->lock); 944 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 945 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 946 if (--ma->mca_users == 0) { 947 *map = ma->next; 948 write_unlock_bh(&idev->lock); 949 950 igmp6_group_dropped(ma); 951 952 ma_put(ma); 953 return 0; 954 } 955 write_unlock_bh(&idev->lock); 956 return 0; 957 } 958 } 959 write_unlock_bh(&idev->lock); 960 961 return -ENOENT; 962 } 963 964 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) 965 { 966 struct inet6_dev *idev = in6_dev_get(dev); 967 int err; 968 969 if (!idev) 970 return -ENODEV; 971 972 err = __ipv6_dev_mc_dec(idev, addr); 973 974 in6_dev_put(idev); 975 976 return err; 977 } 978 979 /* 980 * identify MLD packets for MLD filter exceptions 981 */ 982 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 983 { 984 struct icmp6hdr *pic; 985 986 if (nexthdr != IPPROTO_ICMPV6) 987 return 0; 988 989 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 990 return 0; 991 992 pic = (struct icmp6hdr *)skb->h.raw; 993 994 switch (pic->icmp6_type) { 995 case ICMPV6_MGM_QUERY: 996 case ICMPV6_MGM_REPORT: 997 case ICMPV6_MGM_REDUCTION: 998 case ICMPV6_MLD2_REPORT: 999 return 1; 1000 default: 1001 break; 1002 } 1003 return 0; 1004 } 1005 1006 /* 1007 * check if the interface/address pair is valid 1008 */ 1009 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, 1010 struct in6_addr *src_addr) 1011 { 1012 struct inet6_dev *idev; 1013 struct ifmcaddr6 *mc; 1014 int rv = 0; 1015 1016 idev = in6_dev_get(dev); 1017 if (idev) { 1018 read_lock_bh(&idev->lock); 1019 for (mc = idev->mc_list; mc; mc=mc->next) { 1020 if (ipv6_addr_equal(&mc->mca_addr, group)) 1021 break; 1022 } 1023 if (mc) { 1024 if (src_addr && !ipv6_addr_any(src_addr)) { 1025 struct ip6_sf_list *psf; 1026 1027 spin_lock_bh(&mc->mca_lock); 1028 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1029 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1030 break; 1031 } 1032 if (psf) 1033 rv = psf->sf_count[MCAST_INCLUDE] || 1034 psf->sf_count[MCAST_EXCLUDE] != 1035 mc->mca_sfcount[MCAST_EXCLUDE]; 1036 else 1037 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1038 spin_unlock_bh(&mc->mca_lock); 1039 } else 1040 rv = 1; /* don't filter unspecified source */ 1041 } 1042 read_unlock_bh(&idev->lock); 1043 in6_dev_put(idev); 1044 } 1045 return rv; 1046 } 1047 1048 static void mld_gq_start_timer(struct inet6_dev *idev) 1049 { 1050 int tv = net_random() % idev->mc_maxdelay; 1051 1052 idev->mc_gq_running = 1; 1053 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1054 in6_dev_hold(idev); 1055 } 1056 1057 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1058 { 1059 int tv = net_random() % delay; 1060 1061 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1062 in6_dev_hold(idev); 1063 } 1064 1065 /* 1066 * IGMP handling (alias multicast ICMPv6 messages) 1067 */ 1068 1069 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1070 { 1071 unsigned long delay = resptime; 1072 1073 /* Do not start timer for these addresses */ 1074 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1075 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1076 return; 1077 1078 if (del_timer(&ma->mca_timer)) { 1079 atomic_dec(&ma->mca_refcnt); 1080 delay = ma->mca_timer.expires - jiffies; 1081 } 1082 1083 if (delay >= resptime) { 1084 if (resptime) 1085 delay = net_random() % resptime; 1086 else 1087 delay = 1; 1088 } 1089 ma->mca_timer.expires = jiffies + delay; 1090 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1091 atomic_inc(&ma->mca_refcnt); 1092 ma->mca_flags |= MAF_TIMER_RUNNING; 1093 } 1094 1095 /* mark EXCLUDE-mode sources */ 1096 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1097 struct in6_addr *srcs) 1098 { 1099 struct ip6_sf_list *psf; 1100 int i, scount; 1101 1102 scount = 0; 1103 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1104 if (scount == nsrcs) 1105 break; 1106 for (i=0; i<nsrcs; i++) { 1107 /* skip inactive filters */ 1108 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1109 pmc->mca_sfcount[MCAST_EXCLUDE] != 1110 psf->sf_count[MCAST_EXCLUDE]) 1111 continue; 1112 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1113 scount++; 1114 break; 1115 } 1116 } 1117 } 1118 pmc->mca_flags &= ~MAF_GSQUERY; 1119 if (scount == nsrcs) /* all sources excluded */ 1120 return 0; 1121 return 1; 1122 } 1123 1124 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1125 struct in6_addr *srcs) 1126 { 1127 struct ip6_sf_list *psf; 1128 int i, scount; 1129 1130 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1131 return mld_xmarksources(pmc, nsrcs, srcs); 1132 1133 /* mark INCLUDE-mode sources */ 1134 1135 scount = 0; 1136 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1137 if (scount == nsrcs) 1138 break; 1139 for (i=0; i<nsrcs; i++) { 1140 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1141 psf->sf_gsresp = 1; 1142 scount++; 1143 break; 1144 } 1145 } 1146 } 1147 if (!scount) { 1148 pmc->mca_flags &= ~MAF_GSQUERY; 1149 return 0; 1150 } 1151 pmc->mca_flags |= MAF_GSQUERY; 1152 return 1; 1153 } 1154 1155 int igmp6_event_query(struct sk_buff *skb) 1156 { 1157 struct mld2_query *mlh2 = NULL; 1158 struct ifmcaddr6 *ma; 1159 struct in6_addr *group; 1160 unsigned long max_delay; 1161 struct inet6_dev *idev; 1162 struct icmp6hdr *hdr; 1163 int group_type; 1164 int mark = 0; 1165 int len; 1166 1167 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1168 return -EINVAL; 1169 1170 /* compute payload length excluding extension headers */ 1171 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); 1172 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; 1173 1174 /* Drop queries with not link local source */ 1175 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL)) 1176 return -EINVAL; 1177 1178 idev = in6_dev_get(skb->dev); 1179 1180 if (idev == NULL) 1181 return 0; 1182 1183 hdr = (struct icmp6hdr *) skb->h.raw; 1184 group = (struct in6_addr *) (hdr + 1); 1185 group_type = ipv6_addr_type(group); 1186 1187 if (group_type != IPV6_ADDR_ANY && 1188 !(group_type&IPV6_ADDR_MULTICAST)) { 1189 in6_dev_put(idev); 1190 return -EINVAL; 1191 } 1192 1193 if (len == 24) { 1194 int switchback; 1195 /* MLDv1 router present */ 1196 1197 /* Translate milliseconds to jiffies */ 1198 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1199 1200 switchback = (idev->mc_qrv + 1) * max_delay; 1201 idev->mc_v1_seen = jiffies + switchback; 1202 1203 /* cancel the interface change timer */ 1204 idev->mc_ifc_count = 0; 1205 if (del_timer(&idev->mc_ifc_timer)) 1206 __in6_dev_put(idev); 1207 /* clear deleted report items */ 1208 mld_clear_delrec(idev); 1209 } else if (len >= 28) { 1210 int srcs_offset = sizeof(struct mld2_query) - 1211 sizeof(struct icmp6hdr); 1212 if (!pskb_may_pull(skb, srcs_offset)) { 1213 in6_dev_put(idev); 1214 return -EINVAL; 1215 } 1216 mlh2 = (struct mld2_query *) skb->h.raw; 1217 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1218 if (!max_delay) 1219 max_delay = 1; 1220 idev->mc_maxdelay = max_delay; 1221 if (mlh2->qrv) 1222 idev->mc_qrv = mlh2->qrv; 1223 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1224 if (mlh2->nsrcs) { 1225 in6_dev_put(idev); 1226 return -EINVAL; /* no sources allowed */ 1227 } 1228 mld_gq_start_timer(idev); 1229 in6_dev_put(idev); 1230 return 0; 1231 } 1232 /* mark sources to include, if group & source-specific */ 1233 if (mlh2->nsrcs != 0) { 1234 if (!pskb_may_pull(skb, srcs_offset + 1235 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1236 in6_dev_put(idev); 1237 return -EINVAL; 1238 } 1239 mlh2 = (struct mld2_query *) skb->h.raw; 1240 mark = 1; 1241 } 1242 } else { 1243 in6_dev_put(idev); 1244 return -EINVAL; 1245 } 1246 1247 read_lock_bh(&idev->lock); 1248 if (group_type == IPV6_ADDR_ANY) { 1249 for (ma = idev->mc_list; ma; ma=ma->next) { 1250 spin_lock_bh(&ma->mca_lock); 1251 igmp6_group_queried(ma, max_delay); 1252 spin_unlock_bh(&ma->mca_lock); 1253 } 1254 } else { 1255 for (ma = idev->mc_list; ma; ma=ma->next) { 1256 if (group_type != IPV6_ADDR_ANY && 1257 !ipv6_addr_equal(group, &ma->mca_addr)) 1258 continue; 1259 spin_lock_bh(&ma->mca_lock); 1260 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1261 /* gsquery <- gsquery && mark */ 1262 if (!mark) 1263 ma->mca_flags &= ~MAF_GSQUERY; 1264 } else { 1265 /* gsquery <- mark */ 1266 if (mark) 1267 ma->mca_flags |= MAF_GSQUERY; 1268 else 1269 ma->mca_flags &= ~MAF_GSQUERY; 1270 } 1271 if (!(ma->mca_flags & MAF_GSQUERY) || 1272 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1273 igmp6_group_queried(ma, max_delay); 1274 spin_unlock_bh(&ma->mca_lock); 1275 if (group_type != IPV6_ADDR_ANY) 1276 break; 1277 } 1278 } 1279 read_unlock_bh(&idev->lock); 1280 in6_dev_put(idev); 1281 1282 return 0; 1283 } 1284 1285 1286 int igmp6_event_report(struct sk_buff *skb) 1287 { 1288 struct ifmcaddr6 *ma; 1289 struct in6_addr *addrp; 1290 struct inet6_dev *idev; 1291 struct icmp6hdr *hdr; 1292 int addr_type; 1293 1294 /* Our own report looped back. Ignore it. */ 1295 if (skb->pkt_type == PACKET_LOOPBACK) 1296 return 0; 1297 1298 /* send our report if the MC router may not have heard this report */ 1299 if (skb->pkt_type != PACKET_MULTICAST && 1300 skb->pkt_type != PACKET_BROADCAST) 1301 return 0; 1302 1303 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1304 return -EINVAL; 1305 1306 hdr = (struct icmp6hdr*) skb->h.raw; 1307 1308 /* Drop reports with not link local source */ 1309 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); 1310 if (addr_type != IPV6_ADDR_ANY && 1311 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1312 return -EINVAL; 1313 1314 addrp = (struct in6_addr *) (hdr + 1); 1315 1316 idev = in6_dev_get(skb->dev); 1317 if (idev == NULL) 1318 return -ENODEV; 1319 1320 /* 1321 * Cancel the timer for this group 1322 */ 1323 1324 read_lock_bh(&idev->lock); 1325 for (ma = idev->mc_list; ma; ma=ma->next) { 1326 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1327 spin_lock(&ma->mca_lock); 1328 if (del_timer(&ma->mca_timer)) 1329 atomic_dec(&ma->mca_refcnt); 1330 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1331 spin_unlock(&ma->mca_lock); 1332 break; 1333 } 1334 } 1335 read_unlock_bh(&idev->lock); 1336 in6_dev_put(idev); 1337 return 0; 1338 } 1339 1340 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1341 int gdeleted, int sdeleted) 1342 { 1343 switch (type) { 1344 case MLD2_MODE_IS_INCLUDE: 1345 case MLD2_MODE_IS_EXCLUDE: 1346 if (gdeleted || sdeleted) 1347 return 0; 1348 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1349 if (pmc->mca_sfmode == MCAST_INCLUDE) 1350 return 1; 1351 /* don't include if this source is excluded 1352 * in all filters 1353 */ 1354 if (psf->sf_count[MCAST_INCLUDE]) 1355 return 0; 1356 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1357 psf->sf_count[MCAST_EXCLUDE]; 1358 } 1359 return 0; 1360 case MLD2_CHANGE_TO_INCLUDE: 1361 if (gdeleted || sdeleted) 1362 return 0; 1363 return psf->sf_count[MCAST_INCLUDE] != 0; 1364 case MLD2_CHANGE_TO_EXCLUDE: 1365 if (gdeleted || sdeleted) 1366 return 0; 1367 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1368 psf->sf_count[MCAST_INCLUDE]) 1369 return 0; 1370 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1371 psf->sf_count[MCAST_EXCLUDE]; 1372 case MLD2_ALLOW_NEW_SOURCES: 1373 if (gdeleted || !psf->sf_crcount) 1374 return 0; 1375 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1376 case MLD2_BLOCK_OLD_SOURCES: 1377 if (pmc->mca_sfmode == MCAST_INCLUDE) 1378 return gdeleted || (psf->sf_crcount && sdeleted); 1379 return psf->sf_crcount && !gdeleted && !sdeleted; 1380 } 1381 return 0; 1382 } 1383 1384 static int 1385 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1386 { 1387 struct ip6_sf_list *psf; 1388 int scount = 0; 1389 1390 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1391 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1392 continue; 1393 scount++; 1394 } 1395 return scount; 1396 } 1397 1398 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1399 { 1400 struct sock *sk = igmp6_socket->sk; 1401 struct sk_buff *skb; 1402 struct mld2_report *pmr; 1403 struct in6_addr addr_buf; 1404 int err; 1405 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1406 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1407 IPV6_TLV_PADN, 0 }; 1408 1409 /* we assume size > sizeof(ra) here */ 1410 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1411 1412 if (skb == 0) 1413 return NULL; 1414 1415 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1416 1417 if (ipv6_get_lladdr(dev, &addr_buf)) { 1418 /* <draft-ietf-magma-mld-source-05.txt>: 1419 * use unspecified address as the source address 1420 * when a valid link-local address is not available. 1421 */ 1422 memset(&addr_buf, 0, sizeof(addr_buf)); 1423 } 1424 1425 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1426 1427 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1428 1429 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); 1430 skb->h.raw = (unsigned char *)pmr; 1431 pmr->type = ICMPV6_MLD2_REPORT; 1432 pmr->resv1 = 0; 1433 pmr->csum = 0; 1434 pmr->resv2 = 0; 1435 pmr->ngrec = 0; 1436 return skb; 1437 } 1438 1439 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1440 { 1441 struct net_device *dev = skb->dev; 1442 1443 if (dev->hard_header) { 1444 unsigned char ha[MAX_ADDR_LEN]; 1445 int err; 1446 1447 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1); 1448 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); 1449 if (err < 0) { 1450 kfree_skb(skb); 1451 return err; 1452 } 1453 } 1454 return dev_queue_xmit(skb); 1455 } 1456 1457 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1458 { 1459 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1460 mld_dev_queue_xmit2); 1461 } 1462 1463 static void mld_sendpack(struct sk_buff *skb) 1464 { 1465 struct ipv6hdr *pip6 = skb->nh.ipv6h; 1466 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; 1467 int payload_len, mldlen; 1468 struct inet6_dev *idev = in6_dev_get(skb->dev); 1469 int err; 1470 1471 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1472 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - 1473 sizeof(struct ipv6hdr); 1474 mldlen = skb->tail - skb->h.raw; 1475 pip6->payload_len = htons(payload_len); 1476 1477 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1478 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); 1479 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1480 mld_dev_queue_xmit); 1481 if (!err) { 1482 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); 1483 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1484 } else 1485 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1486 1487 if (likely(idev != NULL)) 1488 in6_dev_put(idev); 1489 } 1490 1491 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1492 { 1493 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1494 } 1495 1496 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1497 int type, struct mld2_grec **ppgr) 1498 { 1499 struct net_device *dev = pmc->idev->dev; 1500 struct mld2_report *pmr; 1501 struct mld2_grec *pgr; 1502 1503 if (!skb) 1504 skb = mld_newpack(dev, dev->mtu); 1505 if (!skb) 1506 return NULL; 1507 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1508 pgr->grec_type = type; 1509 pgr->grec_auxwords = 0; 1510 pgr->grec_nsrcs = 0; 1511 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1512 pmr = (struct mld2_report *)skb->h.raw; 1513 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1514 *ppgr = pgr; 1515 return skb; 1516 } 1517 1518 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1519 skb_tailroom(skb)) : 0) 1520 1521 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1522 int type, int gdeleted, int sdeleted) 1523 { 1524 struct net_device *dev = pmc->idev->dev; 1525 struct mld2_report *pmr; 1526 struct mld2_grec *pgr = NULL; 1527 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1528 int scount, stotal, first, isquery, truncate; 1529 1530 if (pmc->mca_flags & MAF_NOREPORT) 1531 return skb; 1532 1533 isquery = type == MLD2_MODE_IS_INCLUDE || 1534 type == MLD2_MODE_IS_EXCLUDE; 1535 truncate = type == MLD2_MODE_IS_EXCLUDE || 1536 type == MLD2_CHANGE_TO_EXCLUDE; 1537 1538 stotal = scount = 0; 1539 1540 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1541 1542 if (!*psf_list) 1543 goto empty_source; 1544 1545 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; 1546 1547 /* EX and TO_EX get a fresh packet, if needed */ 1548 if (truncate) { 1549 if (pmr && pmr->ngrec && 1550 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1551 if (skb) 1552 mld_sendpack(skb); 1553 skb = mld_newpack(dev, dev->mtu); 1554 } 1555 } 1556 first = 1; 1557 psf_prev = NULL; 1558 for (psf=*psf_list; psf; psf=psf_next) { 1559 struct in6_addr *psrc; 1560 1561 psf_next = psf->sf_next; 1562 1563 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1564 psf_prev = psf; 1565 continue; 1566 } 1567 1568 /* clear marks on query responses */ 1569 if (isquery) 1570 psf->sf_gsresp = 0; 1571 1572 if (AVAILABLE(skb) < sizeof(*psrc) + 1573 first*sizeof(struct mld2_grec)) { 1574 if (truncate && !first) 1575 break; /* truncate these */ 1576 if (pgr) 1577 pgr->grec_nsrcs = htons(scount); 1578 if (skb) 1579 mld_sendpack(skb); 1580 skb = mld_newpack(dev, dev->mtu); 1581 first = 1; 1582 scount = 0; 1583 } 1584 if (first) { 1585 skb = add_grhead(skb, pmc, type, &pgr); 1586 first = 0; 1587 } 1588 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1589 *psrc = psf->sf_addr; 1590 scount++; stotal++; 1591 if ((type == MLD2_ALLOW_NEW_SOURCES || 1592 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1593 psf->sf_crcount--; 1594 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1595 if (psf_prev) 1596 psf_prev->sf_next = psf->sf_next; 1597 else 1598 *psf_list = psf->sf_next; 1599 kfree(psf); 1600 continue; 1601 } 1602 } 1603 psf_prev = psf; 1604 } 1605 1606 empty_source: 1607 if (!stotal) { 1608 if (type == MLD2_ALLOW_NEW_SOURCES || 1609 type == MLD2_BLOCK_OLD_SOURCES) 1610 return skb; 1611 if (pmc->mca_crcount || isquery) { 1612 /* make sure we have room for group header */ 1613 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1614 mld_sendpack(skb); 1615 skb = NULL; /* add_grhead will get a new one */ 1616 } 1617 skb = add_grhead(skb, pmc, type, &pgr); 1618 } 1619 } 1620 if (pgr) 1621 pgr->grec_nsrcs = htons(scount); 1622 1623 if (isquery) 1624 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1625 return skb; 1626 } 1627 1628 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1629 { 1630 struct sk_buff *skb = NULL; 1631 int type; 1632 1633 if (!pmc) { 1634 read_lock_bh(&idev->lock); 1635 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1636 if (pmc->mca_flags & MAF_NOREPORT) 1637 continue; 1638 spin_lock_bh(&pmc->mca_lock); 1639 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1640 type = MLD2_MODE_IS_EXCLUDE; 1641 else 1642 type = MLD2_MODE_IS_INCLUDE; 1643 skb = add_grec(skb, pmc, type, 0, 0); 1644 spin_unlock_bh(&pmc->mca_lock); 1645 } 1646 read_unlock_bh(&idev->lock); 1647 } else { 1648 spin_lock_bh(&pmc->mca_lock); 1649 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1650 type = MLD2_MODE_IS_EXCLUDE; 1651 else 1652 type = MLD2_MODE_IS_INCLUDE; 1653 skb = add_grec(skb, pmc, type, 0, 0); 1654 spin_unlock_bh(&pmc->mca_lock); 1655 } 1656 if (skb) 1657 mld_sendpack(skb); 1658 } 1659 1660 /* 1661 * remove zero-count source records from a source filter list 1662 */ 1663 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1664 { 1665 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1666 1667 psf_prev = NULL; 1668 for (psf=*ppsf; psf; psf = psf_next) { 1669 psf_next = psf->sf_next; 1670 if (psf->sf_crcount == 0) { 1671 if (psf_prev) 1672 psf_prev->sf_next = psf->sf_next; 1673 else 1674 *ppsf = psf->sf_next; 1675 kfree(psf); 1676 } else 1677 psf_prev = psf; 1678 } 1679 } 1680 1681 static void mld_send_cr(struct inet6_dev *idev) 1682 { 1683 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1684 struct sk_buff *skb = NULL; 1685 int type, dtype; 1686 1687 read_lock_bh(&idev->lock); 1688 write_lock_bh(&idev->mc_lock); 1689 1690 /* deleted MCA's */ 1691 pmc_prev = NULL; 1692 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1693 pmc_next = pmc->next; 1694 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1695 type = MLD2_BLOCK_OLD_SOURCES; 1696 dtype = MLD2_BLOCK_OLD_SOURCES; 1697 skb = add_grec(skb, pmc, type, 1, 0); 1698 skb = add_grec(skb, pmc, dtype, 1, 1); 1699 } 1700 if (pmc->mca_crcount) { 1701 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1702 type = MLD2_CHANGE_TO_INCLUDE; 1703 skb = add_grec(skb, pmc, type, 1, 0); 1704 } 1705 pmc->mca_crcount--; 1706 if (pmc->mca_crcount == 0) { 1707 mld_clear_zeros(&pmc->mca_tomb); 1708 mld_clear_zeros(&pmc->mca_sources); 1709 } 1710 } 1711 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1712 !pmc->mca_sources) { 1713 if (pmc_prev) 1714 pmc_prev->next = pmc_next; 1715 else 1716 idev->mc_tomb = pmc_next; 1717 in6_dev_put(pmc->idev); 1718 kfree(pmc); 1719 } else 1720 pmc_prev = pmc; 1721 } 1722 write_unlock_bh(&idev->mc_lock); 1723 1724 /* change recs */ 1725 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1726 spin_lock_bh(&pmc->mca_lock); 1727 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1728 type = MLD2_BLOCK_OLD_SOURCES; 1729 dtype = MLD2_ALLOW_NEW_SOURCES; 1730 } else { 1731 type = MLD2_ALLOW_NEW_SOURCES; 1732 dtype = MLD2_BLOCK_OLD_SOURCES; 1733 } 1734 skb = add_grec(skb, pmc, type, 0, 0); 1735 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1736 1737 /* filter mode changes */ 1738 if (pmc->mca_crcount) { 1739 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1740 type = MLD2_CHANGE_TO_EXCLUDE; 1741 else 1742 type = MLD2_CHANGE_TO_INCLUDE; 1743 skb = add_grec(skb, pmc, type, 0, 0); 1744 pmc->mca_crcount--; 1745 } 1746 spin_unlock_bh(&pmc->mca_lock); 1747 } 1748 read_unlock_bh(&idev->lock); 1749 if (!skb) 1750 return; 1751 (void) mld_sendpack(skb); 1752 } 1753 1754 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1755 { 1756 struct sock *sk = igmp6_socket->sk; 1757 struct inet6_dev *idev; 1758 struct sk_buff *skb; 1759 struct icmp6hdr *hdr; 1760 struct in6_addr *snd_addr; 1761 struct in6_addr *addrp; 1762 struct in6_addr addr_buf; 1763 struct in6_addr all_routers; 1764 int err, len, payload_len, full_len; 1765 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1766 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1767 IPV6_TLV_PADN, 0 }; 1768 1769 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1770 snd_addr = addr; 1771 if (type == ICMPV6_MGM_REDUCTION) { 1772 snd_addr = &all_routers; 1773 ipv6_addr_all_routers(&all_routers); 1774 } 1775 1776 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1777 payload_len = len + sizeof(ra); 1778 full_len = sizeof(struct ipv6hdr) + payload_len; 1779 1780 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1781 1782 if (skb == NULL) { 1783 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1784 return; 1785 } 1786 1787 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1788 1789 if (ipv6_get_lladdr(dev, &addr_buf)) { 1790 /* <draft-ietf-magma-mld-source-05.txt>: 1791 * use unspecified address as the source address 1792 * when a valid link-local address is not available. 1793 */ 1794 memset(&addr_buf, 0, sizeof(addr_buf)); 1795 } 1796 1797 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1798 1799 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1800 1801 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1802 memset(hdr, 0, sizeof(struct icmp6hdr)); 1803 hdr->icmp6_type = type; 1804 1805 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1806 ipv6_addr_copy(addrp, addr); 1807 1808 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1809 IPPROTO_ICMPV6, 1810 csum_partial((__u8 *) hdr, len, 0)); 1811 1812 idev = in6_dev_get(skb->dev); 1813 1814 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1815 mld_dev_queue_xmit); 1816 if (!err) { 1817 if (type == ICMPV6_MGM_REDUCTION) 1818 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); 1819 else 1820 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); 1821 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1822 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1823 } else 1824 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1825 1826 if (likely(idev != NULL)) 1827 in6_dev_put(idev); 1828 return; 1829 } 1830 1831 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1832 struct in6_addr *psfsrc) 1833 { 1834 struct ip6_sf_list *psf, *psf_prev; 1835 int rv = 0; 1836 1837 psf_prev = NULL; 1838 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1839 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1840 break; 1841 psf_prev = psf; 1842 } 1843 if (!psf || psf->sf_count[sfmode] == 0) { 1844 /* source filter not found, or count wrong => bug */ 1845 return -ESRCH; 1846 } 1847 psf->sf_count[sfmode]--; 1848 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1849 struct inet6_dev *idev = pmc->idev; 1850 1851 /* no more filters for this source */ 1852 if (psf_prev) 1853 psf_prev->sf_next = psf->sf_next; 1854 else 1855 pmc->mca_sources = psf->sf_next; 1856 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1857 !MLD_V1_SEEN(idev)) { 1858 psf->sf_crcount = idev->mc_qrv; 1859 psf->sf_next = pmc->mca_tomb; 1860 pmc->mca_tomb = psf; 1861 rv = 1; 1862 } else 1863 kfree(psf); 1864 } 1865 return rv; 1866 } 1867 1868 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1869 int sfmode, int sfcount, struct in6_addr *psfsrc, 1870 int delta) 1871 { 1872 struct ifmcaddr6 *pmc; 1873 int changerec = 0; 1874 int i, err; 1875 1876 if (!idev) 1877 return -ENODEV; 1878 read_lock_bh(&idev->lock); 1879 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1880 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1881 break; 1882 } 1883 if (!pmc) { 1884 /* MCA not found?? bug */ 1885 read_unlock_bh(&idev->lock); 1886 return -ESRCH; 1887 } 1888 spin_lock_bh(&pmc->mca_lock); 1889 sf_markstate(pmc); 1890 if (!delta) { 1891 if (!pmc->mca_sfcount[sfmode]) { 1892 spin_unlock_bh(&pmc->mca_lock); 1893 read_unlock_bh(&idev->lock); 1894 return -EINVAL; 1895 } 1896 pmc->mca_sfcount[sfmode]--; 1897 } 1898 err = 0; 1899 for (i=0; i<sfcount; i++) { 1900 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1901 1902 changerec |= rv > 0; 1903 if (!err && rv < 0) 1904 err = rv; 1905 } 1906 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1907 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1908 pmc->mca_sfcount[MCAST_INCLUDE]) { 1909 struct ip6_sf_list *psf; 1910 1911 /* filter mode change */ 1912 pmc->mca_sfmode = MCAST_INCLUDE; 1913 pmc->mca_crcount = idev->mc_qrv; 1914 idev->mc_ifc_count = pmc->mca_crcount; 1915 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1916 psf->sf_crcount = 0; 1917 mld_ifc_event(pmc->idev); 1918 } else if (sf_setstate(pmc) || changerec) 1919 mld_ifc_event(pmc->idev); 1920 spin_unlock_bh(&pmc->mca_lock); 1921 read_unlock_bh(&idev->lock); 1922 return err; 1923 } 1924 1925 /* 1926 * Add multicast single-source filter to the interface list 1927 */ 1928 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1929 struct in6_addr *psfsrc, int delta) 1930 { 1931 struct ip6_sf_list *psf, *psf_prev; 1932 1933 psf_prev = NULL; 1934 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1935 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1936 break; 1937 psf_prev = psf; 1938 } 1939 if (!psf) { 1940 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); 1941 if (!psf) 1942 return -ENOBUFS; 1943 memset(psf, 0, sizeof(*psf)); 1944 psf->sf_addr = *psfsrc; 1945 if (psf_prev) { 1946 psf_prev->sf_next = psf; 1947 } else 1948 pmc->mca_sources = psf; 1949 } 1950 psf->sf_count[sfmode]++; 1951 return 0; 1952 } 1953 1954 static void sf_markstate(struct ifmcaddr6 *pmc) 1955 { 1956 struct ip6_sf_list *psf; 1957 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1958 1959 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1960 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1961 psf->sf_oldin = mca_xcount == 1962 psf->sf_count[MCAST_EXCLUDE] && 1963 !psf->sf_count[MCAST_INCLUDE]; 1964 } else 1965 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1966 } 1967 1968 static int sf_setstate(struct ifmcaddr6 *pmc) 1969 { 1970 struct ip6_sf_list *psf; 1971 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1972 int qrv = pmc->idev->mc_qrv; 1973 int new_in, rv; 1974 1975 rv = 0; 1976 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1977 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1978 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1979 !psf->sf_count[MCAST_INCLUDE]; 1980 } else 1981 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1982 if (new_in != psf->sf_oldin) { 1983 psf->sf_crcount = qrv; 1984 rv++; 1985 } 1986 } 1987 return rv; 1988 } 1989 1990 /* 1991 * Add multicast source filter list to the interface list 1992 */ 1993 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 1994 int sfmode, int sfcount, struct in6_addr *psfsrc, 1995 int delta) 1996 { 1997 struct ifmcaddr6 *pmc; 1998 int isexclude; 1999 int i, err; 2000 2001 if (!idev) 2002 return -ENODEV; 2003 read_lock_bh(&idev->lock); 2004 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2005 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2006 break; 2007 } 2008 if (!pmc) { 2009 /* MCA not found?? bug */ 2010 read_unlock_bh(&idev->lock); 2011 return -ESRCH; 2012 } 2013 spin_lock_bh(&pmc->mca_lock); 2014 2015 sf_markstate(pmc); 2016 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2017 if (!delta) 2018 pmc->mca_sfcount[sfmode]++; 2019 err = 0; 2020 for (i=0; i<sfcount; i++) { 2021 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2022 if (err) 2023 break; 2024 } 2025 if (err) { 2026 int j; 2027 2028 if (!delta) 2029 pmc->mca_sfcount[sfmode]--; 2030 for (j=0; j<i; j++) 2031 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2032 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2033 struct inet6_dev *idev = pmc->idev; 2034 struct ip6_sf_list *psf; 2035 2036 /* filter mode change */ 2037 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2038 pmc->mca_sfmode = MCAST_EXCLUDE; 2039 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2040 pmc->mca_sfmode = MCAST_INCLUDE; 2041 /* else no filters; keep old mode for reports */ 2042 2043 pmc->mca_crcount = idev->mc_qrv; 2044 idev->mc_ifc_count = pmc->mca_crcount; 2045 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2046 psf->sf_crcount = 0; 2047 mld_ifc_event(idev); 2048 } else if (sf_setstate(pmc)) 2049 mld_ifc_event(idev); 2050 spin_unlock_bh(&pmc->mca_lock); 2051 read_unlock_bh(&idev->lock); 2052 return err; 2053 } 2054 2055 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2056 { 2057 struct ip6_sf_list *psf, *nextpsf; 2058 2059 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2060 nextpsf = psf->sf_next; 2061 kfree(psf); 2062 } 2063 pmc->mca_tomb = NULL; 2064 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2065 nextpsf = psf->sf_next; 2066 kfree(psf); 2067 } 2068 pmc->mca_sources = NULL; 2069 pmc->mca_sfmode = MCAST_EXCLUDE; 2070 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2071 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2072 } 2073 2074 2075 static void igmp6_join_group(struct ifmcaddr6 *ma) 2076 { 2077 unsigned long delay; 2078 2079 if (ma->mca_flags & MAF_NOREPORT) 2080 return; 2081 2082 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2083 2084 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2085 2086 spin_lock_bh(&ma->mca_lock); 2087 if (del_timer(&ma->mca_timer)) { 2088 atomic_dec(&ma->mca_refcnt); 2089 delay = ma->mca_timer.expires - jiffies; 2090 } 2091 2092 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2093 atomic_inc(&ma->mca_refcnt); 2094 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2095 spin_unlock_bh(&ma->mca_lock); 2096 } 2097 2098 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2099 struct inet6_dev *idev) 2100 { 2101 int err; 2102 2103 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2104 * so no other readers or writers of iml or its sflist 2105 */ 2106 if (iml->sflist == 0) { 2107 /* any-source empty exclude case */ 2108 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2109 } 2110 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2111 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2112 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2113 iml->sflist = NULL; 2114 return err; 2115 } 2116 2117 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2118 { 2119 if (MLD_V1_SEEN(ma->idev)) { 2120 if (ma->mca_flags & MAF_LAST_REPORTER) 2121 igmp6_send(&ma->mca_addr, ma->idev->dev, 2122 ICMPV6_MGM_REDUCTION); 2123 } else { 2124 mld_add_delrec(ma->idev, ma); 2125 mld_ifc_event(ma->idev); 2126 } 2127 } 2128 2129 static void mld_gq_timer_expire(unsigned long data) 2130 { 2131 struct inet6_dev *idev = (struct inet6_dev *)data; 2132 2133 idev->mc_gq_running = 0; 2134 mld_send_report(idev, NULL); 2135 __in6_dev_put(idev); 2136 } 2137 2138 static void mld_ifc_timer_expire(unsigned long data) 2139 { 2140 struct inet6_dev *idev = (struct inet6_dev *)data; 2141 2142 mld_send_cr(idev); 2143 if (idev->mc_ifc_count) { 2144 idev->mc_ifc_count--; 2145 if (idev->mc_ifc_count) 2146 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2147 } 2148 __in6_dev_put(idev); 2149 } 2150 2151 static void mld_ifc_event(struct inet6_dev *idev) 2152 { 2153 if (MLD_V1_SEEN(idev)) 2154 return; 2155 idev->mc_ifc_count = idev->mc_qrv; 2156 mld_ifc_start_timer(idev, 1); 2157 } 2158 2159 2160 static void igmp6_timer_handler(unsigned long data) 2161 { 2162 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2163 2164 if (MLD_V1_SEEN(ma->idev)) 2165 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2166 else 2167 mld_send_report(ma->idev, ma); 2168 2169 spin_lock(&ma->mca_lock); 2170 ma->mca_flags |= MAF_LAST_REPORTER; 2171 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2172 spin_unlock(&ma->mca_lock); 2173 ma_put(ma); 2174 } 2175 2176 /* Device going down */ 2177 2178 void ipv6_mc_down(struct inet6_dev *idev) 2179 { 2180 struct ifmcaddr6 *i; 2181 2182 /* Withdraw multicast list */ 2183 2184 read_lock_bh(&idev->lock); 2185 idev->mc_ifc_count = 0; 2186 if (del_timer(&idev->mc_ifc_timer)) 2187 __in6_dev_put(idev); 2188 idev->mc_gq_running = 0; 2189 if (del_timer(&idev->mc_gq_timer)) 2190 __in6_dev_put(idev); 2191 2192 for (i = idev->mc_list; i; i=i->next) 2193 igmp6_group_dropped(i); 2194 read_unlock_bh(&idev->lock); 2195 2196 mld_clear_delrec(idev); 2197 } 2198 2199 2200 /* Device going up */ 2201 2202 void ipv6_mc_up(struct inet6_dev *idev) 2203 { 2204 struct ifmcaddr6 *i; 2205 2206 /* Install multicast list, except for all-nodes (already installed) */ 2207 2208 read_lock_bh(&idev->lock); 2209 for (i = idev->mc_list; i; i=i->next) 2210 igmp6_group_added(i); 2211 read_unlock_bh(&idev->lock); 2212 } 2213 2214 /* IPv6 device initialization. */ 2215 2216 void ipv6_mc_init_dev(struct inet6_dev *idev) 2217 { 2218 struct in6_addr maddr; 2219 2220 write_lock_bh(&idev->lock); 2221 rwlock_init(&idev->mc_lock); 2222 idev->mc_gq_running = 0; 2223 init_timer(&idev->mc_gq_timer); 2224 idev->mc_gq_timer.data = (unsigned long) idev; 2225 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2226 idev->mc_tomb = NULL; 2227 idev->mc_ifc_count = 0; 2228 init_timer(&idev->mc_ifc_timer); 2229 idev->mc_ifc_timer.data = (unsigned long) idev; 2230 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2231 idev->mc_qrv = MLD_QRV_DEFAULT; 2232 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2233 idev->mc_v1_seen = 0; 2234 write_unlock_bh(&idev->lock); 2235 2236 /* Add all-nodes address. */ 2237 ipv6_addr_all_nodes(&maddr); 2238 ipv6_dev_mc_inc(idev->dev, &maddr); 2239 } 2240 2241 /* 2242 * Device is about to be destroyed: clean up. 2243 */ 2244 2245 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2246 { 2247 struct ifmcaddr6 *i; 2248 struct in6_addr maddr; 2249 2250 /* Deactivate timers */ 2251 ipv6_mc_down(idev); 2252 2253 /* Delete all-nodes address. */ 2254 ipv6_addr_all_nodes(&maddr); 2255 2256 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2257 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2258 * fail. 2259 */ 2260 __ipv6_dev_mc_dec(idev, &maddr); 2261 2262 if (idev->cnf.forwarding) { 2263 ipv6_addr_all_routers(&maddr); 2264 __ipv6_dev_mc_dec(idev, &maddr); 2265 } 2266 2267 write_lock_bh(&idev->lock); 2268 while ((i = idev->mc_list) != NULL) { 2269 idev->mc_list = i->next; 2270 write_unlock_bh(&idev->lock); 2271 2272 igmp6_group_dropped(i); 2273 ma_put(i); 2274 2275 write_lock_bh(&idev->lock); 2276 } 2277 write_unlock_bh(&idev->lock); 2278 } 2279 2280 #ifdef CONFIG_PROC_FS 2281 struct igmp6_mc_iter_state { 2282 struct net_device *dev; 2283 struct inet6_dev *idev; 2284 }; 2285 2286 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2287 2288 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2289 { 2290 struct ifmcaddr6 *im = NULL; 2291 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2292 2293 for (state->dev = dev_base, state->idev = NULL; 2294 state->dev; 2295 state->dev = state->dev->next) { 2296 struct inet6_dev *idev; 2297 idev = in6_dev_get(state->dev); 2298 if (!idev) 2299 continue; 2300 read_lock_bh(&idev->lock); 2301 im = idev->mc_list; 2302 if (im) { 2303 state->idev = idev; 2304 break; 2305 } 2306 read_unlock_bh(&idev->lock); 2307 in6_dev_put(idev); 2308 } 2309 return im; 2310 } 2311 2312 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2313 { 2314 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2315 2316 im = im->next; 2317 while (!im) { 2318 if (likely(state->idev != NULL)) { 2319 read_unlock_bh(&state->idev->lock); 2320 in6_dev_put(state->idev); 2321 } 2322 state->dev = state->dev->next; 2323 if (!state->dev) { 2324 state->idev = NULL; 2325 break; 2326 } 2327 state->idev = in6_dev_get(state->dev); 2328 if (!state->idev) 2329 continue; 2330 read_lock_bh(&state->idev->lock); 2331 im = state->idev->mc_list; 2332 } 2333 return im; 2334 } 2335 2336 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2337 { 2338 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2339 if (im) 2340 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2341 --pos; 2342 return pos ? NULL : im; 2343 } 2344 2345 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2346 { 2347 read_lock(&dev_base_lock); 2348 return igmp6_mc_get_idx(seq, *pos); 2349 } 2350 2351 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2352 { 2353 struct ifmcaddr6 *im; 2354 im = igmp6_mc_get_next(seq, v); 2355 ++*pos; 2356 return im; 2357 } 2358 2359 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2360 { 2361 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2362 if (likely(state->idev != NULL)) { 2363 read_unlock_bh(&state->idev->lock); 2364 in6_dev_put(state->idev); 2365 state->idev = NULL; 2366 } 2367 state->dev = NULL; 2368 read_unlock(&dev_base_lock); 2369 } 2370 2371 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2372 { 2373 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2374 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2375 2376 seq_printf(seq, 2377 "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n", 2378 state->dev->ifindex, state->dev->name, 2379 NIP6(im->mca_addr), 2380 im->mca_users, im->mca_flags, 2381 (im->mca_flags&MAF_TIMER_RUNNING) ? 2382 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2383 return 0; 2384 } 2385 2386 static struct seq_operations igmp6_mc_seq_ops = { 2387 .start = igmp6_mc_seq_start, 2388 .next = igmp6_mc_seq_next, 2389 .stop = igmp6_mc_seq_stop, 2390 .show = igmp6_mc_seq_show, 2391 }; 2392 2393 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2394 { 2395 struct seq_file *seq; 2396 int rc = -ENOMEM; 2397 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2398 2399 if (!s) 2400 goto out; 2401 2402 rc = seq_open(file, &igmp6_mc_seq_ops); 2403 if (rc) 2404 goto out_kfree; 2405 2406 seq = file->private_data; 2407 seq->private = s; 2408 memset(s, 0, sizeof(*s)); 2409 out: 2410 return rc; 2411 out_kfree: 2412 kfree(s); 2413 goto out; 2414 } 2415 2416 static struct file_operations igmp6_mc_seq_fops = { 2417 .owner = THIS_MODULE, 2418 .open = igmp6_mc_seq_open, 2419 .read = seq_read, 2420 .llseek = seq_lseek, 2421 .release = seq_release_private, 2422 }; 2423 2424 struct igmp6_mcf_iter_state { 2425 struct net_device *dev; 2426 struct inet6_dev *idev; 2427 struct ifmcaddr6 *im; 2428 }; 2429 2430 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2431 2432 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2433 { 2434 struct ip6_sf_list *psf = NULL; 2435 struct ifmcaddr6 *im = NULL; 2436 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2437 2438 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2439 state->dev; 2440 state->dev = state->dev->next) { 2441 struct inet6_dev *idev; 2442 idev = in6_dev_get(state->dev); 2443 if (unlikely(idev == NULL)) 2444 continue; 2445 read_lock_bh(&idev->lock); 2446 im = idev->mc_list; 2447 if (likely(im != NULL)) { 2448 spin_lock_bh(&im->mca_lock); 2449 psf = im->mca_sources; 2450 if (likely(psf != NULL)) { 2451 state->im = im; 2452 state->idev = idev; 2453 break; 2454 } 2455 spin_unlock_bh(&im->mca_lock); 2456 } 2457 read_unlock_bh(&idev->lock); 2458 in6_dev_put(idev); 2459 } 2460 return psf; 2461 } 2462 2463 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2464 { 2465 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2466 2467 psf = psf->sf_next; 2468 while (!psf) { 2469 spin_unlock_bh(&state->im->mca_lock); 2470 state->im = state->im->next; 2471 while (!state->im) { 2472 if (likely(state->idev != NULL)) { 2473 read_unlock_bh(&state->idev->lock); 2474 in6_dev_put(state->idev); 2475 } 2476 state->dev = state->dev->next; 2477 if (!state->dev) { 2478 state->idev = NULL; 2479 goto out; 2480 } 2481 state->idev = in6_dev_get(state->dev); 2482 if (!state->idev) 2483 continue; 2484 read_lock_bh(&state->idev->lock); 2485 state->im = state->idev->mc_list; 2486 } 2487 if (!state->im) 2488 break; 2489 spin_lock_bh(&state->im->mca_lock); 2490 psf = state->im->mca_sources; 2491 } 2492 out: 2493 return psf; 2494 } 2495 2496 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2497 { 2498 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2499 if (psf) 2500 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2501 --pos; 2502 return pos ? NULL : psf; 2503 } 2504 2505 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2506 { 2507 read_lock(&dev_base_lock); 2508 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2509 } 2510 2511 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2512 { 2513 struct ip6_sf_list *psf; 2514 if (v == SEQ_START_TOKEN) 2515 psf = igmp6_mcf_get_first(seq); 2516 else 2517 psf = igmp6_mcf_get_next(seq, v); 2518 ++*pos; 2519 return psf; 2520 } 2521 2522 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2523 { 2524 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2525 if (likely(state->im != NULL)) { 2526 spin_unlock_bh(&state->im->mca_lock); 2527 state->im = NULL; 2528 } 2529 if (likely(state->idev != NULL)) { 2530 read_unlock_bh(&state->idev->lock); 2531 in6_dev_put(state->idev); 2532 state->idev = NULL; 2533 } 2534 state->dev = NULL; 2535 read_unlock(&dev_base_lock); 2536 } 2537 2538 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2539 { 2540 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2541 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2542 2543 if (v == SEQ_START_TOKEN) { 2544 seq_printf(seq, 2545 "%3s %6s " 2546 "%32s %32s %6s %6s\n", "Idx", 2547 "Device", "Multicast Address", 2548 "Source Address", "INC", "EXC"); 2549 } else { 2550 seq_printf(seq, 2551 "%3d %6.6s " 2552 "%04x%04x%04x%04x%04x%04x%04x%04x " 2553 "%04x%04x%04x%04x%04x%04x%04x%04x " 2554 "%6lu %6lu\n", 2555 state->dev->ifindex, state->dev->name, 2556 NIP6(state->im->mca_addr), 2557 NIP6(psf->sf_addr), 2558 psf->sf_count[MCAST_INCLUDE], 2559 psf->sf_count[MCAST_EXCLUDE]); 2560 } 2561 return 0; 2562 } 2563 2564 static struct seq_operations igmp6_mcf_seq_ops = { 2565 .start = igmp6_mcf_seq_start, 2566 .next = igmp6_mcf_seq_next, 2567 .stop = igmp6_mcf_seq_stop, 2568 .show = igmp6_mcf_seq_show, 2569 }; 2570 2571 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2572 { 2573 struct seq_file *seq; 2574 int rc = -ENOMEM; 2575 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2576 2577 if (!s) 2578 goto out; 2579 2580 rc = seq_open(file, &igmp6_mcf_seq_ops); 2581 if (rc) 2582 goto out_kfree; 2583 2584 seq = file->private_data; 2585 seq->private = s; 2586 memset(s, 0, sizeof(*s)); 2587 out: 2588 return rc; 2589 out_kfree: 2590 kfree(s); 2591 goto out; 2592 } 2593 2594 static struct file_operations igmp6_mcf_seq_fops = { 2595 .owner = THIS_MODULE, 2596 .open = igmp6_mcf_seq_open, 2597 .read = seq_read, 2598 .llseek = seq_lseek, 2599 .release = seq_release_private, 2600 }; 2601 #endif 2602 2603 int __init igmp6_init(struct net_proto_family *ops) 2604 { 2605 struct ipv6_pinfo *np; 2606 struct sock *sk; 2607 int err; 2608 2609 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2610 if (err < 0) { 2611 printk(KERN_ERR 2612 "Failed to initialize the IGMP6 control socket (err %d).\n", 2613 err); 2614 igmp6_socket = NULL; /* For safety. */ 2615 return err; 2616 } 2617 2618 sk = igmp6_socket->sk; 2619 sk->sk_allocation = GFP_ATOMIC; 2620 sk->sk_prot->unhash(sk); 2621 2622 np = inet6_sk(sk); 2623 np->hop_limit = 1; 2624 2625 #ifdef CONFIG_PROC_FS 2626 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2627 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2628 #endif 2629 2630 return 0; 2631 } 2632 2633 void igmp6_cleanup(void) 2634 { 2635 sock_release(igmp6_socket); 2636 igmp6_socket = NULL; /* for safety */ 2637 2638 #ifdef CONFIG_PROC_FS 2639 proc_net_remove("mcfilter6"); 2640 proc_net_remove("igmp6"); 2641 #endif 2642 } 2643