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 = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 453 if (!newpsl) { 454 err = -ENOBUFS; 455 goto done; 456 } 457 newpsl->sl_max = count; 458 newpsl->sl_count = count - IP6_SFBLOCK; 459 if (psl) { 460 for (i=0; i<psl->sl_count; i++) 461 newpsl->sl_addr[i] = psl->sl_addr[i]; 462 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 463 } 464 pmc->sflist = psl = newpsl; 465 } 466 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 467 for (i=0; i<psl->sl_count; i++) { 468 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 469 if (rv == 0) 470 break; 471 } 472 if (rv == 0) /* address already there is an error */ 473 goto done; 474 for (j=psl->sl_count-1; j>=i; j--) 475 psl->sl_addr[j+1] = psl->sl_addr[j]; 476 psl->sl_addr[i] = *source; 477 psl->sl_count++; 478 err = 0; 479 /* update the interface list */ 480 ip6_mc_add_src(idev, group, omode, 1, source, 1); 481 done: 482 if (pmclocked) 483 write_unlock_bh(&pmc->sflock); 484 read_unlock_bh(&ipv6_sk_mc_lock); 485 read_unlock_bh(&idev->lock); 486 in6_dev_put(idev); 487 dev_put(dev); 488 if (leavegroup) 489 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 490 return err; 491 } 492 493 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 494 { 495 struct in6_addr *group; 496 struct ipv6_mc_socklist *pmc; 497 struct net_device *dev; 498 struct inet6_dev *idev; 499 struct ipv6_pinfo *inet6 = inet6_sk(sk); 500 struct ip6_sf_socklist *newpsl, *psl; 501 int leavegroup = 0; 502 int i, err; 503 504 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 505 506 if (!ipv6_addr_is_multicast(group)) 507 return -EINVAL; 508 if (gsf->gf_fmode != MCAST_INCLUDE && 509 gsf->gf_fmode != MCAST_EXCLUDE) 510 return -EINVAL; 511 512 idev = ip6_mc_find_dev(group, gsf->gf_interface); 513 514 if (!idev) 515 return -ENODEV; 516 dev = idev->dev; 517 518 err = 0; 519 read_lock_bh(&ipv6_sk_mc_lock); 520 521 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 522 leavegroup = 1; 523 goto done; 524 } 525 526 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 527 if (pmc->ifindex != gsf->gf_interface) 528 continue; 529 if (ipv6_addr_equal(&pmc->addr, group)) 530 break; 531 } 532 if (!pmc) { /* must have a prior join */ 533 err = -EINVAL; 534 goto done; 535 } 536 if (gsf->gf_numsrc) { 537 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 538 GFP_ATOMIC); 539 if (!newpsl) { 540 err = -ENOBUFS; 541 goto done; 542 } 543 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 544 for (i=0; i<newpsl->sl_count; ++i) { 545 struct sockaddr_in6 *psin6; 546 547 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 548 newpsl->sl_addr[i] = psin6->sin6_addr; 549 } 550 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 551 newpsl->sl_count, newpsl->sl_addr, 0); 552 if (err) { 553 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 554 goto done; 555 } 556 } else { 557 newpsl = NULL; 558 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 559 } 560 561 write_lock_bh(&pmc->sflock); 562 psl = pmc->sflist; 563 if (psl) { 564 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 565 psl->sl_count, psl->sl_addr, 0); 566 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 567 } else 568 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 569 pmc->sflist = newpsl; 570 pmc->sfmode = gsf->gf_fmode; 571 write_unlock_bh(&pmc->sflock); 572 err = 0; 573 done: 574 read_unlock_bh(&ipv6_sk_mc_lock); 575 read_unlock_bh(&idev->lock); 576 in6_dev_put(idev); 577 dev_put(dev); 578 if (leavegroup) 579 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 580 return err; 581 } 582 583 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 584 struct group_filter __user *optval, int __user *optlen) 585 { 586 int err, i, count, copycount; 587 struct in6_addr *group; 588 struct ipv6_mc_socklist *pmc; 589 struct inet6_dev *idev; 590 struct net_device *dev; 591 struct ipv6_pinfo *inet6 = inet6_sk(sk); 592 struct ip6_sf_socklist *psl; 593 594 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 595 596 if (!ipv6_addr_is_multicast(group)) 597 return -EINVAL; 598 599 idev = ip6_mc_find_dev(group, gsf->gf_interface); 600 601 if (!idev) 602 return -ENODEV; 603 604 dev = idev->dev; 605 606 err = -EADDRNOTAVAIL; 607 /* 608 * changes to the ipv6_mc_list require the socket lock and 609 * a read lock on ip6_sk_mc_lock. We have the socket lock, 610 * so reading the list is safe. 611 */ 612 613 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 614 if (pmc->ifindex != gsf->gf_interface) 615 continue; 616 if (ipv6_addr_equal(group, &pmc->addr)) 617 break; 618 } 619 if (!pmc) /* must have a prior join */ 620 goto done; 621 gsf->gf_fmode = pmc->sfmode; 622 psl = pmc->sflist; 623 count = psl ? psl->sl_count : 0; 624 read_unlock_bh(&idev->lock); 625 in6_dev_put(idev); 626 dev_put(dev); 627 628 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 629 gsf->gf_numsrc = count; 630 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 631 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 632 return -EFAULT; 633 } 634 /* changes to psl require the socket lock, a read lock on 635 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 636 * have the socket lock, so reading here is safe. 637 */ 638 for (i=0; i<copycount; i++) { 639 struct sockaddr_in6 *psin6; 640 struct sockaddr_storage ss; 641 642 psin6 = (struct sockaddr_in6 *)&ss; 643 memset(&ss, 0, sizeof(ss)); 644 psin6->sin6_family = AF_INET6; 645 psin6->sin6_addr = psl->sl_addr[i]; 646 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 647 return -EFAULT; 648 } 649 return 0; 650 done: 651 read_unlock_bh(&idev->lock); 652 in6_dev_put(idev); 653 dev_put(dev); 654 return err; 655 } 656 657 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr, 658 struct in6_addr *src_addr) 659 { 660 struct ipv6_pinfo *np = inet6_sk(sk); 661 struct ipv6_mc_socklist *mc; 662 struct ip6_sf_socklist *psl; 663 int rv = 1; 664 665 read_lock(&ipv6_sk_mc_lock); 666 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 667 if (ipv6_addr_equal(&mc->addr, mc_addr)) 668 break; 669 } 670 if (!mc) { 671 read_unlock(&ipv6_sk_mc_lock); 672 return 1; 673 } 674 read_lock(&mc->sflock); 675 psl = mc->sflist; 676 if (!psl) { 677 rv = mc->sfmode == MCAST_EXCLUDE; 678 } else { 679 int i; 680 681 for (i=0; i<psl->sl_count; i++) { 682 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 683 break; 684 } 685 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 686 rv = 0; 687 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 688 rv = 0; 689 } 690 read_unlock(&mc->sflock); 691 read_unlock(&ipv6_sk_mc_lock); 692 693 return rv; 694 } 695 696 static void ma_put(struct ifmcaddr6 *mc) 697 { 698 if (atomic_dec_and_test(&mc->mca_refcnt)) { 699 in6_dev_put(mc->idev); 700 kfree(mc); 701 } 702 } 703 704 static void igmp6_group_added(struct ifmcaddr6 *mc) 705 { 706 struct net_device *dev = mc->idev->dev; 707 char buf[MAX_ADDR_LEN]; 708 709 spin_lock_bh(&mc->mca_lock); 710 if (!(mc->mca_flags&MAF_LOADED)) { 711 mc->mca_flags |= MAF_LOADED; 712 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 713 dev_mc_add(dev, buf, dev->addr_len, 0); 714 } 715 spin_unlock_bh(&mc->mca_lock); 716 717 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 718 return; 719 720 if (MLD_V1_SEEN(mc->idev)) { 721 igmp6_join_group(mc); 722 return; 723 } 724 /* else v2 */ 725 726 mc->mca_crcount = mc->idev->mc_qrv; 727 mld_ifc_event(mc->idev); 728 } 729 730 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 731 { 732 struct net_device *dev = mc->idev->dev; 733 char buf[MAX_ADDR_LEN]; 734 735 spin_lock_bh(&mc->mca_lock); 736 if (mc->mca_flags&MAF_LOADED) { 737 mc->mca_flags &= ~MAF_LOADED; 738 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 739 dev_mc_delete(dev, buf, dev->addr_len, 0); 740 } 741 742 if (mc->mca_flags & MAF_NOREPORT) 743 goto done; 744 spin_unlock_bh(&mc->mca_lock); 745 746 if (!mc->idev->dead) 747 igmp6_leave_group(mc); 748 749 spin_lock_bh(&mc->mca_lock); 750 if (del_timer(&mc->mca_timer)) 751 atomic_dec(&mc->mca_refcnt); 752 done: 753 ip6_mc_clear_src(mc); 754 spin_unlock_bh(&mc->mca_lock); 755 } 756 757 /* 758 * deleted ifmcaddr6 manipulation 759 */ 760 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 761 { 762 struct ifmcaddr6 *pmc; 763 764 /* this is an "ifmcaddr6" for convenience; only the fields below 765 * are actually used. In particular, the refcnt and users are not 766 * used for management of the delete list. Using the same structure 767 * for deleted items allows change reports to use common code with 768 * non-deleted or query-response MCA's. 769 */ 770 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 771 if (!pmc) 772 return; 773 774 spin_lock_bh(&im->mca_lock); 775 spin_lock_init(&pmc->mca_lock); 776 pmc->idev = im->idev; 777 in6_dev_hold(idev); 778 pmc->mca_addr = im->mca_addr; 779 pmc->mca_crcount = idev->mc_qrv; 780 pmc->mca_sfmode = im->mca_sfmode; 781 if (pmc->mca_sfmode == MCAST_INCLUDE) { 782 struct ip6_sf_list *psf; 783 784 pmc->mca_tomb = im->mca_tomb; 785 pmc->mca_sources = im->mca_sources; 786 im->mca_tomb = im->mca_sources = NULL; 787 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 788 psf->sf_crcount = pmc->mca_crcount; 789 } 790 spin_unlock_bh(&im->mca_lock); 791 792 write_lock_bh(&idev->mc_lock); 793 pmc->next = idev->mc_tomb; 794 idev->mc_tomb = pmc; 795 write_unlock_bh(&idev->mc_lock); 796 } 797 798 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 799 { 800 struct ifmcaddr6 *pmc, *pmc_prev; 801 struct ip6_sf_list *psf, *psf_next; 802 803 write_lock_bh(&idev->mc_lock); 804 pmc_prev = NULL; 805 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 806 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 807 break; 808 pmc_prev = pmc; 809 } 810 if (pmc) { 811 if (pmc_prev) 812 pmc_prev->next = pmc->next; 813 else 814 idev->mc_tomb = pmc->next; 815 } 816 write_unlock_bh(&idev->mc_lock); 817 if (pmc) { 818 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 819 psf_next = psf->sf_next; 820 kfree(psf); 821 } 822 in6_dev_put(pmc->idev); 823 kfree(pmc); 824 } 825 } 826 827 static void mld_clear_delrec(struct inet6_dev *idev) 828 { 829 struct ifmcaddr6 *pmc, *nextpmc; 830 831 write_lock_bh(&idev->mc_lock); 832 pmc = idev->mc_tomb; 833 idev->mc_tomb = NULL; 834 write_unlock_bh(&idev->mc_lock); 835 836 for (; pmc; pmc = nextpmc) { 837 nextpmc = pmc->next; 838 ip6_mc_clear_src(pmc); 839 in6_dev_put(pmc->idev); 840 kfree(pmc); 841 } 842 843 /* clear dead sources, too */ 844 read_lock_bh(&idev->lock); 845 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 846 struct ip6_sf_list *psf, *psf_next; 847 848 spin_lock_bh(&pmc->mca_lock); 849 psf = pmc->mca_tomb; 850 pmc->mca_tomb = NULL; 851 spin_unlock_bh(&pmc->mca_lock); 852 for (; psf; psf=psf_next) { 853 psf_next = psf->sf_next; 854 kfree(psf); 855 } 856 } 857 read_unlock_bh(&idev->lock); 858 } 859 860 861 /* 862 * device multicast group inc (add if not found) 863 */ 864 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr) 865 { 866 struct ifmcaddr6 *mc; 867 struct inet6_dev *idev; 868 869 idev = in6_dev_get(dev); 870 871 if (idev == NULL) 872 return -EINVAL; 873 874 write_lock_bh(&idev->lock); 875 if (idev->dead) { 876 write_unlock_bh(&idev->lock); 877 in6_dev_put(idev); 878 return -ENODEV; 879 } 880 881 for (mc = idev->mc_list; mc; mc = mc->next) { 882 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 883 mc->mca_users++; 884 write_unlock_bh(&idev->lock); 885 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 886 NULL, 0); 887 in6_dev_put(idev); 888 return 0; 889 } 890 } 891 892 /* 893 * not found: create a new one. 894 */ 895 896 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 897 898 if (mc == NULL) { 899 write_unlock_bh(&idev->lock); 900 in6_dev_put(idev); 901 return -ENOMEM; 902 } 903 904 init_timer(&mc->mca_timer); 905 mc->mca_timer.function = igmp6_timer_handler; 906 mc->mca_timer.data = (unsigned long) mc; 907 908 ipv6_addr_copy(&mc->mca_addr, addr); 909 mc->idev = idev; 910 mc->mca_users = 1; 911 /* mca_stamp should be updated upon changes */ 912 mc->mca_cstamp = mc->mca_tstamp = jiffies; 913 atomic_set(&mc->mca_refcnt, 2); 914 spin_lock_init(&mc->mca_lock); 915 916 /* initial mode is (EX, empty) */ 917 mc->mca_sfmode = MCAST_EXCLUDE; 918 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 919 920 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 921 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 922 mc->mca_flags |= MAF_NOREPORT; 923 924 mc->next = idev->mc_list; 925 idev->mc_list = mc; 926 write_unlock_bh(&idev->lock); 927 928 mld_del_delrec(idev, &mc->mca_addr); 929 igmp6_group_added(mc); 930 ma_put(mc); 931 return 0; 932 } 933 934 /* 935 * device multicast group del 936 */ 937 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) 938 { 939 struct ifmcaddr6 *ma, **map; 940 941 write_lock_bh(&idev->lock); 942 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 943 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 944 if (--ma->mca_users == 0) { 945 *map = ma->next; 946 write_unlock_bh(&idev->lock); 947 948 igmp6_group_dropped(ma); 949 950 ma_put(ma); 951 return 0; 952 } 953 write_unlock_bh(&idev->lock); 954 return 0; 955 } 956 } 957 write_unlock_bh(&idev->lock); 958 959 return -ENOENT; 960 } 961 962 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) 963 { 964 struct inet6_dev *idev = in6_dev_get(dev); 965 int err; 966 967 if (!idev) 968 return -ENODEV; 969 970 err = __ipv6_dev_mc_dec(idev, addr); 971 972 in6_dev_put(idev); 973 974 return err; 975 } 976 977 /* 978 * identify MLD packets for MLD filter exceptions 979 */ 980 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 981 { 982 struct icmp6hdr *pic; 983 984 if (nexthdr != IPPROTO_ICMPV6) 985 return 0; 986 987 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 988 return 0; 989 990 pic = (struct icmp6hdr *)skb->h.raw; 991 992 switch (pic->icmp6_type) { 993 case ICMPV6_MGM_QUERY: 994 case ICMPV6_MGM_REPORT: 995 case ICMPV6_MGM_REDUCTION: 996 case ICMPV6_MLD2_REPORT: 997 return 1; 998 default: 999 break; 1000 } 1001 return 0; 1002 } 1003 1004 /* 1005 * check if the interface/address pair is valid 1006 */ 1007 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, 1008 struct in6_addr *src_addr) 1009 { 1010 struct inet6_dev *idev; 1011 struct ifmcaddr6 *mc; 1012 int rv = 0; 1013 1014 idev = in6_dev_get(dev); 1015 if (idev) { 1016 read_lock_bh(&idev->lock); 1017 for (mc = idev->mc_list; mc; mc=mc->next) { 1018 if (ipv6_addr_equal(&mc->mca_addr, group)) 1019 break; 1020 } 1021 if (mc) { 1022 if (src_addr && !ipv6_addr_any(src_addr)) { 1023 struct ip6_sf_list *psf; 1024 1025 spin_lock_bh(&mc->mca_lock); 1026 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1027 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1028 break; 1029 } 1030 if (psf) 1031 rv = psf->sf_count[MCAST_INCLUDE] || 1032 psf->sf_count[MCAST_EXCLUDE] != 1033 mc->mca_sfcount[MCAST_EXCLUDE]; 1034 else 1035 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1036 spin_unlock_bh(&mc->mca_lock); 1037 } else 1038 rv = 1; /* don't filter unspecified source */ 1039 } 1040 read_unlock_bh(&idev->lock); 1041 in6_dev_put(idev); 1042 } 1043 return rv; 1044 } 1045 1046 static void mld_gq_start_timer(struct inet6_dev *idev) 1047 { 1048 int tv = net_random() % idev->mc_maxdelay; 1049 1050 idev->mc_gq_running = 1; 1051 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1052 in6_dev_hold(idev); 1053 } 1054 1055 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1056 { 1057 int tv = net_random() % delay; 1058 1059 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1060 in6_dev_hold(idev); 1061 } 1062 1063 /* 1064 * IGMP handling (alias multicast ICMPv6 messages) 1065 */ 1066 1067 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1068 { 1069 unsigned long delay = resptime; 1070 1071 /* Do not start timer for these addresses */ 1072 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1073 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1074 return; 1075 1076 if (del_timer(&ma->mca_timer)) { 1077 atomic_dec(&ma->mca_refcnt); 1078 delay = ma->mca_timer.expires - jiffies; 1079 } 1080 1081 if (delay >= resptime) { 1082 if (resptime) 1083 delay = net_random() % resptime; 1084 else 1085 delay = 1; 1086 } 1087 ma->mca_timer.expires = jiffies + delay; 1088 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1089 atomic_inc(&ma->mca_refcnt); 1090 ma->mca_flags |= MAF_TIMER_RUNNING; 1091 } 1092 1093 /* mark EXCLUDE-mode sources */ 1094 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1095 struct in6_addr *srcs) 1096 { 1097 struct ip6_sf_list *psf; 1098 int i, scount; 1099 1100 scount = 0; 1101 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1102 if (scount == nsrcs) 1103 break; 1104 for (i=0; i<nsrcs; i++) { 1105 /* skip inactive filters */ 1106 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1107 pmc->mca_sfcount[MCAST_EXCLUDE] != 1108 psf->sf_count[MCAST_EXCLUDE]) 1109 continue; 1110 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1111 scount++; 1112 break; 1113 } 1114 } 1115 } 1116 pmc->mca_flags &= ~MAF_GSQUERY; 1117 if (scount == nsrcs) /* all sources excluded */ 1118 return 0; 1119 return 1; 1120 } 1121 1122 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1123 struct in6_addr *srcs) 1124 { 1125 struct ip6_sf_list *psf; 1126 int i, scount; 1127 1128 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1129 return mld_xmarksources(pmc, nsrcs, srcs); 1130 1131 /* mark INCLUDE-mode sources */ 1132 1133 scount = 0; 1134 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1135 if (scount == nsrcs) 1136 break; 1137 for (i=0; i<nsrcs; i++) { 1138 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1139 psf->sf_gsresp = 1; 1140 scount++; 1141 break; 1142 } 1143 } 1144 } 1145 if (!scount) { 1146 pmc->mca_flags &= ~MAF_GSQUERY; 1147 return 0; 1148 } 1149 pmc->mca_flags |= MAF_GSQUERY; 1150 return 1; 1151 } 1152 1153 int igmp6_event_query(struct sk_buff *skb) 1154 { 1155 struct mld2_query *mlh2 = NULL; 1156 struct ifmcaddr6 *ma; 1157 struct in6_addr *group; 1158 unsigned long max_delay; 1159 struct inet6_dev *idev; 1160 struct icmp6hdr *hdr; 1161 int group_type; 1162 int mark = 0; 1163 int len; 1164 1165 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1166 return -EINVAL; 1167 1168 /* compute payload length excluding extension headers */ 1169 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); 1170 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; 1171 1172 /* Drop queries with not link local source */ 1173 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL)) 1174 return -EINVAL; 1175 1176 idev = in6_dev_get(skb->dev); 1177 1178 if (idev == NULL) 1179 return 0; 1180 1181 hdr = (struct icmp6hdr *) skb->h.raw; 1182 group = (struct in6_addr *) (hdr + 1); 1183 group_type = ipv6_addr_type(group); 1184 1185 if (group_type != IPV6_ADDR_ANY && 1186 !(group_type&IPV6_ADDR_MULTICAST)) { 1187 in6_dev_put(idev); 1188 return -EINVAL; 1189 } 1190 1191 if (len == 24) { 1192 int switchback; 1193 /* MLDv1 router present */ 1194 1195 /* Translate milliseconds to jiffies */ 1196 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1197 1198 switchback = (idev->mc_qrv + 1) * max_delay; 1199 idev->mc_v1_seen = jiffies + switchback; 1200 1201 /* cancel the interface change timer */ 1202 idev->mc_ifc_count = 0; 1203 if (del_timer(&idev->mc_ifc_timer)) 1204 __in6_dev_put(idev); 1205 /* clear deleted report items */ 1206 mld_clear_delrec(idev); 1207 } else if (len >= 28) { 1208 int srcs_offset = sizeof(struct mld2_query) - 1209 sizeof(struct icmp6hdr); 1210 if (!pskb_may_pull(skb, srcs_offset)) { 1211 in6_dev_put(idev); 1212 return -EINVAL; 1213 } 1214 mlh2 = (struct mld2_query *) skb->h.raw; 1215 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1216 if (!max_delay) 1217 max_delay = 1; 1218 idev->mc_maxdelay = max_delay; 1219 if (mlh2->qrv) 1220 idev->mc_qrv = mlh2->qrv; 1221 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1222 if (mlh2->nsrcs) { 1223 in6_dev_put(idev); 1224 return -EINVAL; /* no sources allowed */ 1225 } 1226 mld_gq_start_timer(idev); 1227 in6_dev_put(idev); 1228 return 0; 1229 } 1230 /* mark sources to include, if group & source-specific */ 1231 if (mlh2->nsrcs != 0) { 1232 if (!pskb_may_pull(skb, srcs_offset + 1233 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1234 in6_dev_put(idev); 1235 return -EINVAL; 1236 } 1237 mlh2 = (struct mld2_query *) skb->h.raw; 1238 mark = 1; 1239 } 1240 } else { 1241 in6_dev_put(idev); 1242 return -EINVAL; 1243 } 1244 1245 read_lock_bh(&idev->lock); 1246 if (group_type == IPV6_ADDR_ANY) { 1247 for (ma = idev->mc_list; ma; ma=ma->next) { 1248 spin_lock_bh(&ma->mca_lock); 1249 igmp6_group_queried(ma, max_delay); 1250 spin_unlock_bh(&ma->mca_lock); 1251 } 1252 } else { 1253 for (ma = idev->mc_list; ma; ma=ma->next) { 1254 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1255 continue; 1256 spin_lock_bh(&ma->mca_lock); 1257 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1258 /* gsquery <- gsquery && mark */ 1259 if (!mark) 1260 ma->mca_flags &= ~MAF_GSQUERY; 1261 } else { 1262 /* gsquery <- mark */ 1263 if (mark) 1264 ma->mca_flags |= MAF_GSQUERY; 1265 else 1266 ma->mca_flags &= ~MAF_GSQUERY; 1267 } 1268 if (!(ma->mca_flags & MAF_GSQUERY) || 1269 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1270 igmp6_group_queried(ma, max_delay); 1271 spin_unlock_bh(&ma->mca_lock); 1272 break; 1273 } 1274 } 1275 read_unlock_bh(&idev->lock); 1276 in6_dev_put(idev); 1277 1278 return 0; 1279 } 1280 1281 1282 int igmp6_event_report(struct sk_buff *skb) 1283 { 1284 struct ifmcaddr6 *ma; 1285 struct in6_addr *addrp; 1286 struct inet6_dev *idev; 1287 struct icmp6hdr *hdr; 1288 int addr_type; 1289 1290 /* Our own report looped back. Ignore it. */ 1291 if (skb->pkt_type == PACKET_LOOPBACK) 1292 return 0; 1293 1294 /* send our report if the MC router may not have heard this report */ 1295 if (skb->pkt_type != PACKET_MULTICAST && 1296 skb->pkt_type != PACKET_BROADCAST) 1297 return 0; 1298 1299 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1300 return -EINVAL; 1301 1302 hdr = (struct icmp6hdr*) skb->h.raw; 1303 1304 /* Drop reports with not link local source */ 1305 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); 1306 if (addr_type != IPV6_ADDR_ANY && 1307 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1308 return -EINVAL; 1309 1310 addrp = (struct in6_addr *) (hdr + 1); 1311 1312 idev = in6_dev_get(skb->dev); 1313 if (idev == NULL) 1314 return -ENODEV; 1315 1316 /* 1317 * Cancel the timer for this group 1318 */ 1319 1320 read_lock_bh(&idev->lock); 1321 for (ma = idev->mc_list; ma; ma=ma->next) { 1322 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1323 spin_lock(&ma->mca_lock); 1324 if (del_timer(&ma->mca_timer)) 1325 atomic_dec(&ma->mca_refcnt); 1326 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1327 spin_unlock(&ma->mca_lock); 1328 break; 1329 } 1330 } 1331 read_unlock_bh(&idev->lock); 1332 in6_dev_put(idev); 1333 return 0; 1334 } 1335 1336 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1337 int gdeleted, int sdeleted) 1338 { 1339 switch (type) { 1340 case MLD2_MODE_IS_INCLUDE: 1341 case MLD2_MODE_IS_EXCLUDE: 1342 if (gdeleted || sdeleted) 1343 return 0; 1344 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1345 if (pmc->mca_sfmode == MCAST_INCLUDE) 1346 return 1; 1347 /* don't include if this source is excluded 1348 * in all filters 1349 */ 1350 if (psf->sf_count[MCAST_INCLUDE]) 1351 return type == MLD2_MODE_IS_INCLUDE; 1352 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1353 psf->sf_count[MCAST_EXCLUDE]; 1354 } 1355 return 0; 1356 case MLD2_CHANGE_TO_INCLUDE: 1357 if (gdeleted || sdeleted) 1358 return 0; 1359 return psf->sf_count[MCAST_INCLUDE] != 0; 1360 case MLD2_CHANGE_TO_EXCLUDE: 1361 if (gdeleted || sdeleted) 1362 return 0; 1363 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1364 psf->sf_count[MCAST_INCLUDE]) 1365 return 0; 1366 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1367 psf->sf_count[MCAST_EXCLUDE]; 1368 case MLD2_ALLOW_NEW_SOURCES: 1369 if (gdeleted || !psf->sf_crcount) 1370 return 0; 1371 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1372 case MLD2_BLOCK_OLD_SOURCES: 1373 if (pmc->mca_sfmode == MCAST_INCLUDE) 1374 return gdeleted || (psf->sf_crcount && sdeleted); 1375 return psf->sf_crcount && !gdeleted && !sdeleted; 1376 } 1377 return 0; 1378 } 1379 1380 static int 1381 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1382 { 1383 struct ip6_sf_list *psf; 1384 int scount = 0; 1385 1386 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1387 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1388 continue; 1389 scount++; 1390 } 1391 return scount; 1392 } 1393 1394 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1395 { 1396 struct sock *sk = igmp6_socket->sk; 1397 struct sk_buff *skb; 1398 struct mld2_report *pmr; 1399 struct in6_addr addr_buf; 1400 int err; 1401 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1402 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1403 IPV6_TLV_PADN, 0 }; 1404 1405 /* we assume size > sizeof(ra) here */ 1406 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1407 1408 if (skb == 0) 1409 return NULL; 1410 1411 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1412 1413 if (ipv6_get_lladdr(dev, &addr_buf)) { 1414 /* <draft-ietf-magma-mld-source-05.txt>: 1415 * use unspecified address as the source address 1416 * when a valid link-local address is not available. 1417 */ 1418 memset(&addr_buf, 0, sizeof(addr_buf)); 1419 } 1420 1421 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1422 1423 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1424 1425 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); 1426 skb->h.raw = (unsigned char *)pmr; 1427 pmr->type = ICMPV6_MLD2_REPORT; 1428 pmr->resv1 = 0; 1429 pmr->csum = 0; 1430 pmr->resv2 = 0; 1431 pmr->ngrec = 0; 1432 return skb; 1433 } 1434 1435 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1436 { 1437 struct net_device *dev = skb->dev; 1438 1439 if (dev->hard_header) { 1440 unsigned char ha[MAX_ADDR_LEN]; 1441 int err; 1442 1443 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1); 1444 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); 1445 if (err < 0) { 1446 kfree_skb(skb); 1447 return err; 1448 } 1449 } 1450 return dev_queue_xmit(skb); 1451 } 1452 1453 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1454 { 1455 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1456 mld_dev_queue_xmit2); 1457 } 1458 1459 static void mld_sendpack(struct sk_buff *skb) 1460 { 1461 struct ipv6hdr *pip6 = skb->nh.ipv6h; 1462 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; 1463 int payload_len, mldlen; 1464 struct inet6_dev *idev = in6_dev_get(skb->dev); 1465 int err; 1466 1467 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1468 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - 1469 sizeof(struct ipv6hdr); 1470 mldlen = skb->tail - skb->h.raw; 1471 pip6->payload_len = htons(payload_len); 1472 1473 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1474 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); 1475 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1476 mld_dev_queue_xmit); 1477 if (!err) { 1478 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); 1479 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1480 } else 1481 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1482 1483 if (likely(idev != NULL)) 1484 in6_dev_put(idev); 1485 } 1486 1487 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1488 { 1489 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1490 } 1491 1492 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1493 int type, struct mld2_grec **ppgr) 1494 { 1495 struct net_device *dev = pmc->idev->dev; 1496 struct mld2_report *pmr; 1497 struct mld2_grec *pgr; 1498 1499 if (!skb) 1500 skb = mld_newpack(dev, dev->mtu); 1501 if (!skb) 1502 return NULL; 1503 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1504 pgr->grec_type = type; 1505 pgr->grec_auxwords = 0; 1506 pgr->grec_nsrcs = 0; 1507 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1508 pmr = (struct mld2_report *)skb->h.raw; 1509 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1510 *ppgr = pgr; 1511 return skb; 1512 } 1513 1514 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1515 skb_tailroom(skb)) : 0) 1516 1517 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1518 int type, int gdeleted, int sdeleted) 1519 { 1520 struct net_device *dev = pmc->idev->dev; 1521 struct mld2_report *pmr; 1522 struct mld2_grec *pgr = NULL; 1523 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1524 int scount, stotal, first, isquery, truncate; 1525 1526 if (pmc->mca_flags & MAF_NOREPORT) 1527 return skb; 1528 1529 isquery = type == MLD2_MODE_IS_INCLUDE || 1530 type == MLD2_MODE_IS_EXCLUDE; 1531 truncate = type == MLD2_MODE_IS_EXCLUDE || 1532 type == MLD2_CHANGE_TO_EXCLUDE; 1533 1534 stotal = scount = 0; 1535 1536 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1537 1538 if (!*psf_list) 1539 goto empty_source; 1540 1541 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; 1542 1543 /* EX and TO_EX get a fresh packet, if needed */ 1544 if (truncate) { 1545 if (pmr && pmr->ngrec && 1546 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1547 if (skb) 1548 mld_sendpack(skb); 1549 skb = mld_newpack(dev, dev->mtu); 1550 } 1551 } 1552 first = 1; 1553 psf_prev = NULL; 1554 for (psf=*psf_list; psf; psf=psf_next) { 1555 struct in6_addr *psrc; 1556 1557 psf_next = psf->sf_next; 1558 1559 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1560 psf_prev = psf; 1561 continue; 1562 } 1563 1564 /* clear marks on query responses */ 1565 if (isquery) 1566 psf->sf_gsresp = 0; 1567 1568 if (AVAILABLE(skb) < sizeof(*psrc) + 1569 first*sizeof(struct mld2_grec)) { 1570 if (truncate && !first) 1571 break; /* truncate these */ 1572 if (pgr) 1573 pgr->grec_nsrcs = htons(scount); 1574 if (skb) 1575 mld_sendpack(skb); 1576 skb = mld_newpack(dev, dev->mtu); 1577 first = 1; 1578 scount = 0; 1579 } 1580 if (first) { 1581 skb = add_grhead(skb, pmc, type, &pgr); 1582 first = 0; 1583 } 1584 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1585 *psrc = psf->sf_addr; 1586 scount++; stotal++; 1587 if ((type == MLD2_ALLOW_NEW_SOURCES || 1588 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1589 psf->sf_crcount--; 1590 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1591 if (psf_prev) 1592 psf_prev->sf_next = psf->sf_next; 1593 else 1594 *psf_list = psf->sf_next; 1595 kfree(psf); 1596 continue; 1597 } 1598 } 1599 psf_prev = psf; 1600 } 1601 1602 empty_source: 1603 if (!stotal) { 1604 if (type == MLD2_ALLOW_NEW_SOURCES || 1605 type == MLD2_BLOCK_OLD_SOURCES) 1606 return skb; 1607 if (pmc->mca_crcount || isquery) { 1608 /* make sure we have room for group header */ 1609 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1610 mld_sendpack(skb); 1611 skb = NULL; /* add_grhead will get a new one */ 1612 } 1613 skb = add_grhead(skb, pmc, type, &pgr); 1614 } 1615 } 1616 if (pgr) 1617 pgr->grec_nsrcs = htons(scount); 1618 1619 if (isquery) 1620 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1621 return skb; 1622 } 1623 1624 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1625 { 1626 struct sk_buff *skb = NULL; 1627 int type; 1628 1629 if (!pmc) { 1630 read_lock_bh(&idev->lock); 1631 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1632 if (pmc->mca_flags & MAF_NOREPORT) 1633 continue; 1634 spin_lock_bh(&pmc->mca_lock); 1635 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1636 type = MLD2_MODE_IS_EXCLUDE; 1637 else 1638 type = MLD2_MODE_IS_INCLUDE; 1639 skb = add_grec(skb, pmc, type, 0, 0); 1640 spin_unlock_bh(&pmc->mca_lock); 1641 } 1642 read_unlock_bh(&idev->lock); 1643 } else { 1644 spin_lock_bh(&pmc->mca_lock); 1645 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1646 type = MLD2_MODE_IS_EXCLUDE; 1647 else 1648 type = MLD2_MODE_IS_INCLUDE; 1649 skb = add_grec(skb, pmc, type, 0, 0); 1650 spin_unlock_bh(&pmc->mca_lock); 1651 } 1652 if (skb) 1653 mld_sendpack(skb); 1654 } 1655 1656 /* 1657 * remove zero-count source records from a source filter list 1658 */ 1659 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1660 { 1661 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1662 1663 psf_prev = NULL; 1664 for (psf=*ppsf; psf; psf = psf_next) { 1665 psf_next = psf->sf_next; 1666 if (psf->sf_crcount == 0) { 1667 if (psf_prev) 1668 psf_prev->sf_next = psf->sf_next; 1669 else 1670 *ppsf = psf->sf_next; 1671 kfree(psf); 1672 } else 1673 psf_prev = psf; 1674 } 1675 } 1676 1677 static void mld_send_cr(struct inet6_dev *idev) 1678 { 1679 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1680 struct sk_buff *skb = NULL; 1681 int type, dtype; 1682 1683 read_lock_bh(&idev->lock); 1684 write_lock_bh(&idev->mc_lock); 1685 1686 /* deleted MCA's */ 1687 pmc_prev = NULL; 1688 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1689 pmc_next = pmc->next; 1690 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1691 type = MLD2_BLOCK_OLD_SOURCES; 1692 dtype = MLD2_BLOCK_OLD_SOURCES; 1693 skb = add_grec(skb, pmc, type, 1, 0); 1694 skb = add_grec(skb, pmc, dtype, 1, 1); 1695 } 1696 if (pmc->mca_crcount) { 1697 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1698 type = MLD2_CHANGE_TO_INCLUDE; 1699 skb = add_grec(skb, pmc, type, 1, 0); 1700 } 1701 pmc->mca_crcount--; 1702 if (pmc->mca_crcount == 0) { 1703 mld_clear_zeros(&pmc->mca_tomb); 1704 mld_clear_zeros(&pmc->mca_sources); 1705 } 1706 } 1707 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1708 !pmc->mca_sources) { 1709 if (pmc_prev) 1710 pmc_prev->next = pmc_next; 1711 else 1712 idev->mc_tomb = pmc_next; 1713 in6_dev_put(pmc->idev); 1714 kfree(pmc); 1715 } else 1716 pmc_prev = pmc; 1717 } 1718 write_unlock_bh(&idev->mc_lock); 1719 1720 /* change recs */ 1721 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1722 spin_lock_bh(&pmc->mca_lock); 1723 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1724 type = MLD2_BLOCK_OLD_SOURCES; 1725 dtype = MLD2_ALLOW_NEW_SOURCES; 1726 } else { 1727 type = MLD2_ALLOW_NEW_SOURCES; 1728 dtype = MLD2_BLOCK_OLD_SOURCES; 1729 } 1730 skb = add_grec(skb, pmc, type, 0, 0); 1731 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1732 1733 /* filter mode changes */ 1734 if (pmc->mca_crcount) { 1735 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1736 type = MLD2_CHANGE_TO_EXCLUDE; 1737 else 1738 type = MLD2_CHANGE_TO_INCLUDE; 1739 skb = add_grec(skb, pmc, type, 0, 0); 1740 pmc->mca_crcount--; 1741 } 1742 spin_unlock_bh(&pmc->mca_lock); 1743 } 1744 read_unlock_bh(&idev->lock); 1745 if (!skb) 1746 return; 1747 (void) mld_sendpack(skb); 1748 } 1749 1750 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1751 { 1752 struct sock *sk = igmp6_socket->sk; 1753 struct inet6_dev *idev; 1754 struct sk_buff *skb; 1755 struct icmp6hdr *hdr; 1756 struct in6_addr *snd_addr; 1757 struct in6_addr *addrp; 1758 struct in6_addr addr_buf; 1759 struct in6_addr all_routers; 1760 int err, len, payload_len, full_len; 1761 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1762 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1763 IPV6_TLV_PADN, 0 }; 1764 1765 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1766 snd_addr = addr; 1767 if (type == ICMPV6_MGM_REDUCTION) { 1768 snd_addr = &all_routers; 1769 ipv6_addr_all_routers(&all_routers); 1770 } 1771 1772 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1773 payload_len = len + sizeof(ra); 1774 full_len = sizeof(struct ipv6hdr) + payload_len; 1775 1776 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1777 1778 if (skb == NULL) { 1779 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1780 return; 1781 } 1782 1783 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1784 1785 if (ipv6_get_lladdr(dev, &addr_buf)) { 1786 /* <draft-ietf-magma-mld-source-05.txt>: 1787 * use unspecified address as the source address 1788 * when a valid link-local address is not available. 1789 */ 1790 memset(&addr_buf, 0, sizeof(addr_buf)); 1791 } 1792 1793 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1794 1795 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1796 1797 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1798 memset(hdr, 0, sizeof(struct icmp6hdr)); 1799 hdr->icmp6_type = type; 1800 1801 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1802 ipv6_addr_copy(addrp, addr); 1803 1804 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1805 IPPROTO_ICMPV6, 1806 csum_partial((__u8 *) hdr, len, 0)); 1807 1808 idev = in6_dev_get(skb->dev); 1809 1810 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1811 mld_dev_queue_xmit); 1812 if (!err) { 1813 if (type == ICMPV6_MGM_REDUCTION) 1814 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); 1815 else 1816 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); 1817 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1818 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1819 } else 1820 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1821 1822 if (likely(idev != NULL)) 1823 in6_dev_put(idev); 1824 return; 1825 } 1826 1827 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1828 struct in6_addr *psfsrc) 1829 { 1830 struct ip6_sf_list *psf, *psf_prev; 1831 int rv = 0; 1832 1833 psf_prev = NULL; 1834 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1835 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1836 break; 1837 psf_prev = psf; 1838 } 1839 if (!psf || psf->sf_count[sfmode] == 0) { 1840 /* source filter not found, or count wrong => bug */ 1841 return -ESRCH; 1842 } 1843 psf->sf_count[sfmode]--; 1844 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1845 struct inet6_dev *idev = pmc->idev; 1846 1847 /* no more filters for this source */ 1848 if (psf_prev) 1849 psf_prev->sf_next = psf->sf_next; 1850 else 1851 pmc->mca_sources = psf->sf_next; 1852 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1853 !MLD_V1_SEEN(idev)) { 1854 psf->sf_crcount = idev->mc_qrv; 1855 psf->sf_next = pmc->mca_tomb; 1856 pmc->mca_tomb = psf; 1857 rv = 1; 1858 } else 1859 kfree(psf); 1860 } 1861 return rv; 1862 } 1863 1864 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1865 int sfmode, int sfcount, struct in6_addr *psfsrc, 1866 int delta) 1867 { 1868 struct ifmcaddr6 *pmc; 1869 int changerec = 0; 1870 int i, err; 1871 1872 if (!idev) 1873 return -ENODEV; 1874 read_lock_bh(&idev->lock); 1875 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1876 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1877 break; 1878 } 1879 if (!pmc) { 1880 /* MCA not found?? bug */ 1881 read_unlock_bh(&idev->lock); 1882 return -ESRCH; 1883 } 1884 spin_lock_bh(&pmc->mca_lock); 1885 sf_markstate(pmc); 1886 if (!delta) { 1887 if (!pmc->mca_sfcount[sfmode]) { 1888 spin_unlock_bh(&pmc->mca_lock); 1889 read_unlock_bh(&idev->lock); 1890 return -EINVAL; 1891 } 1892 pmc->mca_sfcount[sfmode]--; 1893 } 1894 err = 0; 1895 for (i=0; i<sfcount; i++) { 1896 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1897 1898 changerec |= rv > 0; 1899 if (!err && rv < 0) 1900 err = rv; 1901 } 1902 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1903 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1904 pmc->mca_sfcount[MCAST_INCLUDE]) { 1905 struct ip6_sf_list *psf; 1906 1907 /* filter mode change */ 1908 pmc->mca_sfmode = MCAST_INCLUDE; 1909 pmc->mca_crcount = idev->mc_qrv; 1910 idev->mc_ifc_count = pmc->mca_crcount; 1911 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1912 psf->sf_crcount = 0; 1913 mld_ifc_event(pmc->idev); 1914 } else if (sf_setstate(pmc) || changerec) 1915 mld_ifc_event(pmc->idev); 1916 spin_unlock_bh(&pmc->mca_lock); 1917 read_unlock_bh(&idev->lock); 1918 return err; 1919 } 1920 1921 /* 1922 * Add multicast single-source filter to the interface list 1923 */ 1924 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1925 struct in6_addr *psfsrc, int delta) 1926 { 1927 struct ip6_sf_list *psf, *psf_prev; 1928 1929 psf_prev = NULL; 1930 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1931 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1932 break; 1933 psf_prev = psf; 1934 } 1935 if (!psf) { 1936 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1937 if (!psf) 1938 return -ENOBUFS; 1939 1940 psf->sf_addr = *psfsrc; 1941 if (psf_prev) { 1942 psf_prev->sf_next = psf; 1943 } else 1944 pmc->mca_sources = psf; 1945 } 1946 psf->sf_count[sfmode]++; 1947 return 0; 1948 } 1949 1950 static void sf_markstate(struct ifmcaddr6 *pmc) 1951 { 1952 struct ip6_sf_list *psf; 1953 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1954 1955 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1956 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1957 psf->sf_oldin = mca_xcount == 1958 psf->sf_count[MCAST_EXCLUDE] && 1959 !psf->sf_count[MCAST_INCLUDE]; 1960 } else 1961 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1962 } 1963 1964 static int sf_setstate(struct ifmcaddr6 *pmc) 1965 { 1966 struct ip6_sf_list *psf, *dpsf; 1967 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1968 int qrv = pmc->idev->mc_qrv; 1969 int new_in, rv; 1970 1971 rv = 0; 1972 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1973 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1974 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1975 !psf->sf_count[MCAST_INCLUDE]; 1976 } else 1977 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1978 if (new_in) { 1979 if (!psf->sf_oldin) { 1980 struct ip6_sf_list *prev = NULL; 1981 1982 for (dpsf=pmc->mca_tomb; dpsf; 1983 dpsf=dpsf->sf_next) { 1984 if (ipv6_addr_equal(&dpsf->sf_addr, 1985 &psf->sf_addr)) 1986 break; 1987 prev = dpsf; 1988 } 1989 if (dpsf) { 1990 if (prev) 1991 prev->sf_next = dpsf->sf_next; 1992 else 1993 pmc->mca_tomb = dpsf->sf_next; 1994 kfree(dpsf); 1995 } 1996 psf->sf_crcount = qrv; 1997 rv++; 1998 } 1999 } else if (psf->sf_oldin) { 2000 psf->sf_crcount = 0; 2001 /* 2002 * add or update "delete" records if an active filter 2003 * is now inactive 2004 */ 2005 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2006 if (ipv6_addr_equal(&dpsf->sf_addr, 2007 &psf->sf_addr)) 2008 break; 2009 if (!dpsf) { 2010 dpsf = (struct ip6_sf_list *) 2011 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2012 if (!dpsf) 2013 continue; 2014 *dpsf = *psf; 2015 /* pmc->mca_lock held by callers */ 2016 dpsf->sf_next = pmc->mca_tomb; 2017 pmc->mca_tomb = dpsf; 2018 } 2019 dpsf->sf_crcount = qrv; 2020 rv++; 2021 } 2022 } 2023 return rv; 2024 } 2025 2026 /* 2027 * Add multicast source filter list to the interface list 2028 */ 2029 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2030 int sfmode, int sfcount, struct in6_addr *psfsrc, 2031 int delta) 2032 { 2033 struct ifmcaddr6 *pmc; 2034 int isexclude; 2035 int i, err; 2036 2037 if (!idev) 2038 return -ENODEV; 2039 read_lock_bh(&idev->lock); 2040 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2041 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2042 break; 2043 } 2044 if (!pmc) { 2045 /* MCA not found?? bug */ 2046 read_unlock_bh(&idev->lock); 2047 return -ESRCH; 2048 } 2049 spin_lock_bh(&pmc->mca_lock); 2050 2051 sf_markstate(pmc); 2052 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2053 if (!delta) 2054 pmc->mca_sfcount[sfmode]++; 2055 err = 0; 2056 for (i=0; i<sfcount; i++) { 2057 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2058 if (err) 2059 break; 2060 } 2061 if (err) { 2062 int j; 2063 2064 if (!delta) 2065 pmc->mca_sfcount[sfmode]--; 2066 for (j=0; j<i; j++) 2067 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2068 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2069 struct inet6_dev *idev = pmc->idev; 2070 struct ip6_sf_list *psf; 2071 2072 /* filter mode change */ 2073 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2074 pmc->mca_sfmode = MCAST_EXCLUDE; 2075 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2076 pmc->mca_sfmode = MCAST_INCLUDE; 2077 /* else no filters; keep old mode for reports */ 2078 2079 pmc->mca_crcount = idev->mc_qrv; 2080 idev->mc_ifc_count = pmc->mca_crcount; 2081 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2082 psf->sf_crcount = 0; 2083 mld_ifc_event(idev); 2084 } else if (sf_setstate(pmc)) 2085 mld_ifc_event(idev); 2086 spin_unlock_bh(&pmc->mca_lock); 2087 read_unlock_bh(&idev->lock); 2088 return err; 2089 } 2090 2091 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2092 { 2093 struct ip6_sf_list *psf, *nextpsf; 2094 2095 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2096 nextpsf = psf->sf_next; 2097 kfree(psf); 2098 } 2099 pmc->mca_tomb = NULL; 2100 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2101 nextpsf = psf->sf_next; 2102 kfree(psf); 2103 } 2104 pmc->mca_sources = NULL; 2105 pmc->mca_sfmode = MCAST_EXCLUDE; 2106 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2107 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2108 } 2109 2110 2111 static void igmp6_join_group(struct ifmcaddr6 *ma) 2112 { 2113 unsigned long delay; 2114 2115 if (ma->mca_flags & MAF_NOREPORT) 2116 return; 2117 2118 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2119 2120 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2121 2122 spin_lock_bh(&ma->mca_lock); 2123 if (del_timer(&ma->mca_timer)) { 2124 atomic_dec(&ma->mca_refcnt); 2125 delay = ma->mca_timer.expires - jiffies; 2126 } 2127 2128 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2129 atomic_inc(&ma->mca_refcnt); 2130 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2131 spin_unlock_bh(&ma->mca_lock); 2132 } 2133 2134 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2135 struct inet6_dev *idev) 2136 { 2137 int err; 2138 2139 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2140 * so no other readers or writers of iml or its sflist 2141 */ 2142 if (iml->sflist == 0) { 2143 /* any-source empty exclude case */ 2144 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2145 } 2146 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2147 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2148 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2149 iml->sflist = NULL; 2150 return err; 2151 } 2152 2153 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2154 { 2155 if (MLD_V1_SEEN(ma->idev)) { 2156 if (ma->mca_flags & MAF_LAST_REPORTER) 2157 igmp6_send(&ma->mca_addr, ma->idev->dev, 2158 ICMPV6_MGM_REDUCTION); 2159 } else { 2160 mld_add_delrec(ma->idev, ma); 2161 mld_ifc_event(ma->idev); 2162 } 2163 } 2164 2165 static void mld_gq_timer_expire(unsigned long data) 2166 { 2167 struct inet6_dev *idev = (struct inet6_dev *)data; 2168 2169 idev->mc_gq_running = 0; 2170 mld_send_report(idev, NULL); 2171 __in6_dev_put(idev); 2172 } 2173 2174 static void mld_ifc_timer_expire(unsigned long data) 2175 { 2176 struct inet6_dev *idev = (struct inet6_dev *)data; 2177 2178 mld_send_cr(idev); 2179 if (idev->mc_ifc_count) { 2180 idev->mc_ifc_count--; 2181 if (idev->mc_ifc_count) 2182 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2183 } 2184 __in6_dev_put(idev); 2185 } 2186 2187 static void mld_ifc_event(struct inet6_dev *idev) 2188 { 2189 if (MLD_V1_SEEN(idev)) 2190 return; 2191 idev->mc_ifc_count = idev->mc_qrv; 2192 mld_ifc_start_timer(idev, 1); 2193 } 2194 2195 2196 static void igmp6_timer_handler(unsigned long data) 2197 { 2198 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2199 2200 if (MLD_V1_SEEN(ma->idev)) 2201 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2202 else 2203 mld_send_report(ma->idev, ma); 2204 2205 spin_lock(&ma->mca_lock); 2206 ma->mca_flags |= MAF_LAST_REPORTER; 2207 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2208 spin_unlock(&ma->mca_lock); 2209 ma_put(ma); 2210 } 2211 2212 /* Device going down */ 2213 2214 void ipv6_mc_down(struct inet6_dev *idev) 2215 { 2216 struct ifmcaddr6 *i; 2217 2218 /* Withdraw multicast list */ 2219 2220 read_lock_bh(&idev->lock); 2221 idev->mc_ifc_count = 0; 2222 if (del_timer(&idev->mc_ifc_timer)) 2223 __in6_dev_put(idev); 2224 idev->mc_gq_running = 0; 2225 if (del_timer(&idev->mc_gq_timer)) 2226 __in6_dev_put(idev); 2227 2228 for (i = idev->mc_list; i; i=i->next) 2229 igmp6_group_dropped(i); 2230 read_unlock_bh(&idev->lock); 2231 2232 mld_clear_delrec(idev); 2233 } 2234 2235 2236 /* Device going up */ 2237 2238 void ipv6_mc_up(struct inet6_dev *idev) 2239 { 2240 struct ifmcaddr6 *i; 2241 2242 /* Install multicast list, except for all-nodes (already installed) */ 2243 2244 read_lock_bh(&idev->lock); 2245 for (i = idev->mc_list; i; i=i->next) 2246 igmp6_group_added(i); 2247 read_unlock_bh(&idev->lock); 2248 } 2249 2250 /* IPv6 device initialization. */ 2251 2252 void ipv6_mc_init_dev(struct inet6_dev *idev) 2253 { 2254 struct in6_addr maddr; 2255 2256 write_lock_bh(&idev->lock); 2257 rwlock_init(&idev->mc_lock); 2258 idev->mc_gq_running = 0; 2259 init_timer(&idev->mc_gq_timer); 2260 idev->mc_gq_timer.data = (unsigned long) idev; 2261 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2262 idev->mc_tomb = NULL; 2263 idev->mc_ifc_count = 0; 2264 init_timer(&idev->mc_ifc_timer); 2265 idev->mc_ifc_timer.data = (unsigned long) idev; 2266 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2267 idev->mc_qrv = MLD_QRV_DEFAULT; 2268 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2269 idev->mc_v1_seen = 0; 2270 write_unlock_bh(&idev->lock); 2271 2272 /* Add all-nodes address. */ 2273 ipv6_addr_all_nodes(&maddr); 2274 ipv6_dev_mc_inc(idev->dev, &maddr); 2275 } 2276 2277 /* 2278 * Device is about to be destroyed: clean up. 2279 */ 2280 2281 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2282 { 2283 struct ifmcaddr6 *i; 2284 struct in6_addr maddr; 2285 2286 /* Deactivate timers */ 2287 ipv6_mc_down(idev); 2288 2289 /* Delete all-nodes address. */ 2290 ipv6_addr_all_nodes(&maddr); 2291 2292 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2293 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2294 * fail. 2295 */ 2296 __ipv6_dev_mc_dec(idev, &maddr); 2297 2298 if (idev->cnf.forwarding) { 2299 ipv6_addr_all_routers(&maddr); 2300 __ipv6_dev_mc_dec(idev, &maddr); 2301 } 2302 2303 write_lock_bh(&idev->lock); 2304 while ((i = idev->mc_list) != NULL) { 2305 idev->mc_list = i->next; 2306 write_unlock_bh(&idev->lock); 2307 2308 igmp6_group_dropped(i); 2309 ma_put(i); 2310 2311 write_lock_bh(&idev->lock); 2312 } 2313 write_unlock_bh(&idev->lock); 2314 } 2315 2316 #ifdef CONFIG_PROC_FS 2317 struct igmp6_mc_iter_state { 2318 struct net_device *dev; 2319 struct inet6_dev *idev; 2320 }; 2321 2322 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2323 2324 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2325 { 2326 struct ifmcaddr6 *im = NULL; 2327 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2328 2329 for (state->dev = dev_base, state->idev = NULL; 2330 state->dev; 2331 state->dev = state->dev->next) { 2332 struct inet6_dev *idev; 2333 idev = in6_dev_get(state->dev); 2334 if (!idev) 2335 continue; 2336 read_lock_bh(&idev->lock); 2337 im = idev->mc_list; 2338 if (im) { 2339 state->idev = idev; 2340 break; 2341 } 2342 read_unlock_bh(&idev->lock); 2343 in6_dev_put(idev); 2344 } 2345 return im; 2346 } 2347 2348 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2349 { 2350 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2351 2352 im = im->next; 2353 while (!im) { 2354 if (likely(state->idev != NULL)) { 2355 read_unlock_bh(&state->idev->lock); 2356 in6_dev_put(state->idev); 2357 } 2358 state->dev = state->dev->next; 2359 if (!state->dev) { 2360 state->idev = NULL; 2361 break; 2362 } 2363 state->idev = in6_dev_get(state->dev); 2364 if (!state->idev) 2365 continue; 2366 read_lock_bh(&state->idev->lock); 2367 im = state->idev->mc_list; 2368 } 2369 return im; 2370 } 2371 2372 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2373 { 2374 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2375 if (im) 2376 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2377 --pos; 2378 return pos ? NULL : im; 2379 } 2380 2381 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2382 { 2383 read_lock(&dev_base_lock); 2384 return igmp6_mc_get_idx(seq, *pos); 2385 } 2386 2387 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2388 { 2389 struct ifmcaddr6 *im; 2390 im = igmp6_mc_get_next(seq, v); 2391 ++*pos; 2392 return im; 2393 } 2394 2395 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2396 { 2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2398 if (likely(state->idev != NULL)) { 2399 read_unlock_bh(&state->idev->lock); 2400 in6_dev_put(state->idev); 2401 state->idev = NULL; 2402 } 2403 state->dev = NULL; 2404 read_unlock(&dev_base_lock); 2405 } 2406 2407 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2408 { 2409 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2410 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2411 2412 seq_printf(seq, 2413 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2414 state->dev->ifindex, state->dev->name, 2415 NIP6(im->mca_addr), 2416 im->mca_users, im->mca_flags, 2417 (im->mca_flags&MAF_TIMER_RUNNING) ? 2418 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2419 return 0; 2420 } 2421 2422 static struct seq_operations igmp6_mc_seq_ops = { 2423 .start = igmp6_mc_seq_start, 2424 .next = igmp6_mc_seq_next, 2425 .stop = igmp6_mc_seq_stop, 2426 .show = igmp6_mc_seq_show, 2427 }; 2428 2429 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2430 { 2431 struct seq_file *seq; 2432 int rc = -ENOMEM; 2433 struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2434 2435 if (!s) 2436 goto out; 2437 2438 rc = seq_open(file, &igmp6_mc_seq_ops); 2439 if (rc) 2440 goto out_kfree; 2441 2442 seq = file->private_data; 2443 seq->private = s; 2444 out: 2445 return rc; 2446 out_kfree: 2447 kfree(s); 2448 goto out; 2449 } 2450 2451 static struct file_operations igmp6_mc_seq_fops = { 2452 .owner = THIS_MODULE, 2453 .open = igmp6_mc_seq_open, 2454 .read = seq_read, 2455 .llseek = seq_lseek, 2456 .release = seq_release_private, 2457 }; 2458 2459 struct igmp6_mcf_iter_state { 2460 struct net_device *dev; 2461 struct inet6_dev *idev; 2462 struct ifmcaddr6 *im; 2463 }; 2464 2465 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2466 2467 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2468 { 2469 struct ip6_sf_list *psf = NULL; 2470 struct ifmcaddr6 *im = NULL; 2471 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2472 2473 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2474 state->dev; 2475 state->dev = state->dev->next) { 2476 struct inet6_dev *idev; 2477 idev = in6_dev_get(state->dev); 2478 if (unlikely(idev == NULL)) 2479 continue; 2480 read_lock_bh(&idev->lock); 2481 im = idev->mc_list; 2482 if (likely(im != NULL)) { 2483 spin_lock_bh(&im->mca_lock); 2484 psf = im->mca_sources; 2485 if (likely(psf != NULL)) { 2486 state->im = im; 2487 state->idev = idev; 2488 break; 2489 } 2490 spin_unlock_bh(&im->mca_lock); 2491 } 2492 read_unlock_bh(&idev->lock); 2493 in6_dev_put(idev); 2494 } 2495 return psf; 2496 } 2497 2498 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2499 { 2500 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2501 2502 psf = psf->sf_next; 2503 while (!psf) { 2504 spin_unlock_bh(&state->im->mca_lock); 2505 state->im = state->im->next; 2506 while (!state->im) { 2507 if (likely(state->idev != NULL)) { 2508 read_unlock_bh(&state->idev->lock); 2509 in6_dev_put(state->idev); 2510 } 2511 state->dev = state->dev->next; 2512 if (!state->dev) { 2513 state->idev = NULL; 2514 goto out; 2515 } 2516 state->idev = in6_dev_get(state->dev); 2517 if (!state->idev) 2518 continue; 2519 read_lock_bh(&state->idev->lock); 2520 state->im = state->idev->mc_list; 2521 } 2522 if (!state->im) 2523 break; 2524 spin_lock_bh(&state->im->mca_lock); 2525 psf = state->im->mca_sources; 2526 } 2527 out: 2528 return psf; 2529 } 2530 2531 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2532 { 2533 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2534 if (psf) 2535 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2536 --pos; 2537 return pos ? NULL : psf; 2538 } 2539 2540 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2541 { 2542 read_lock(&dev_base_lock); 2543 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2544 } 2545 2546 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2547 { 2548 struct ip6_sf_list *psf; 2549 if (v == SEQ_START_TOKEN) 2550 psf = igmp6_mcf_get_first(seq); 2551 else 2552 psf = igmp6_mcf_get_next(seq, v); 2553 ++*pos; 2554 return psf; 2555 } 2556 2557 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2558 { 2559 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2560 if (likely(state->im != NULL)) { 2561 spin_unlock_bh(&state->im->mca_lock); 2562 state->im = NULL; 2563 } 2564 if (likely(state->idev != NULL)) { 2565 read_unlock_bh(&state->idev->lock); 2566 in6_dev_put(state->idev); 2567 state->idev = NULL; 2568 } 2569 state->dev = NULL; 2570 read_unlock(&dev_base_lock); 2571 } 2572 2573 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2574 { 2575 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2576 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2577 2578 if (v == SEQ_START_TOKEN) { 2579 seq_printf(seq, 2580 "%3s %6s " 2581 "%32s %32s %6s %6s\n", "Idx", 2582 "Device", "Multicast Address", 2583 "Source Address", "INC", "EXC"); 2584 } else { 2585 seq_printf(seq, 2586 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n", 2587 state->dev->ifindex, state->dev->name, 2588 NIP6(state->im->mca_addr), 2589 NIP6(psf->sf_addr), 2590 psf->sf_count[MCAST_INCLUDE], 2591 psf->sf_count[MCAST_EXCLUDE]); 2592 } 2593 return 0; 2594 } 2595 2596 static struct seq_operations igmp6_mcf_seq_ops = { 2597 .start = igmp6_mcf_seq_start, 2598 .next = igmp6_mcf_seq_next, 2599 .stop = igmp6_mcf_seq_stop, 2600 .show = igmp6_mcf_seq_show, 2601 }; 2602 2603 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2604 { 2605 struct seq_file *seq; 2606 int rc = -ENOMEM; 2607 struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2608 2609 if (!s) 2610 goto out; 2611 2612 rc = seq_open(file, &igmp6_mcf_seq_ops); 2613 if (rc) 2614 goto out_kfree; 2615 2616 seq = file->private_data; 2617 seq->private = s; 2618 out: 2619 return rc; 2620 out_kfree: 2621 kfree(s); 2622 goto out; 2623 } 2624 2625 static struct file_operations igmp6_mcf_seq_fops = { 2626 .owner = THIS_MODULE, 2627 .open = igmp6_mcf_seq_open, 2628 .read = seq_read, 2629 .llseek = seq_lseek, 2630 .release = seq_release_private, 2631 }; 2632 #endif 2633 2634 int __init igmp6_init(struct net_proto_family *ops) 2635 { 2636 struct ipv6_pinfo *np; 2637 struct sock *sk; 2638 int err; 2639 2640 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2641 if (err < 0) { 2642 printk(KERN_ERR 2643 "Failed to initialize the IGMP6 control socket (err %d).\n", 2644 err); 2645 igmp6_socket = NULL; /* For safety. */ 2646 return err; 2647 } 2648 2649 sk = igmp6_socket->sk; 2650 sk->sk_allocation = GFP_ATOMIC; 2651 sk->sk_prot->unhash(sk); 2652 2653 np = inet6_sk(sk); 2654 np->hop_limit = 1; 2655 2656 #ifdef CONFIG_PROC_FS 2657 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2658 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2659 #endif 2660 2661 return 0; 2662 } 2663 2664 void igmp6_cleanup(void) 2665 { 2666 sock_release(igmp6_socket); 2667 igmp6_socket = NULL; /* for safety */ 2668 2669 #ifdef CONFIG_PROC_FS 2670 proc_net_remove("mcfilter6"); 2671 proc_net_remove("igmp6"); 2672 #endif 2673 } 2674