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 = kmalloc(sizeof(*pmc), GFP_ATOMIC); 771 if (!pmc) 772 return; 773 memset(pmc, 0, sizeof(*pmc)); 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 = kmalloc(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 memset(mc, 0, sizeof(struct ifmcaddr6)); 905 init_timer(&mc->mca_timer); 906 mc->mca_timer.function = igmp6_timer_handler; 907 mc->mca_timer.data = (unsigned long) mc; 908 909 ipv6_addr_copy(&mc->mca_addr, addr); 910 mc->idev = idev; 911 mc->mca_users = 1; 912 /* mca_stamp should be updated upon changes */ 913 mc->mca_cstamp = mc->mca_tstamp = jiffies; 914 atomic_set(&mc->mca_refcnt, 2); 915 spin_lock_init(&mc->mca_lock); 916 917 /* initial mode is (EX, empty) */ 918 mc->mca_sfmode = MCAST_EXCLUDE; 919 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 920 921 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 922 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 923 mc->mca_flags |= MAF_NOREPORT; 924 925 mc->next = idev->mc_list; 926 idev->mc_list = mc; 927 write_unlock_bh(&idev->lock); 928 929 mld_del_delrec(idev, &mc->mca_addr); 930 igmp6_group_added(mc); 931 ma_put(mc); 932 return 0; 933 } 934 935 /* 936 * device multicast group del 937 */ 938 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) 939 { 940 struct ifmcaddr6 *ma, **map; 941 942 write_lock_bh(&idev->lock); 943 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 944 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 945 if (--ma->mca_users == 0) { 946 *map = ma->next; 947 write_unlock_bh(&idev->lock); 948 949 igmp6_group_dropped(ma); 950 951 ma_put(ma); 952 return 0; 953 } 954 write_unlock_bh(&idev->lock); 955 return 0; 956 } 957 } 958 write_unlock_bh(&idev->lock); 959 960 return -ENOENT; 961 } 962 963 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) 964 { 965 struct inet6_dev *idev = in6_dev_get(dev); 966 int err; 967 968 if (!idev) 969 return -ENODEV; 970 971 err = __ipv6_dev_mc_dec(idev, addr); 972 973 in6_dev_put(idev); 974 975 return err; 976 } 977 978 /* 979 * identify MLD packets for MLD filter exceptions 980 */ 981 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 982 { 983 struct icmp6hdr *pic; 984 985 if (nexthdr != IPPROTO_ICMPV6) 986 return 0; 987 988 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 989 return 0; 990 991 pic = (struct icmp6hdr *)skb->h.raw; 992 993 switch (pic->icmp6_type) { 994 case ICMPV6_MGM_QUERY: 995 case ICMPV6_MGM_REPORT: 996 case ICMPV6_MGM_REDUCTION: 997 case ICMPV6_MLD2_REPORT: 998 return 1; 999 default: 1000 break; 1001 } 1002 return 0; 1003 } 1004 1005 /* 1006 * check if the interface/address pair is valid 1007 */ 1008 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, 1009 struct in6_addr *src_addr) 1010 { 1011 struct inet6_dev *idev; 1012 struct ifmcaddr6 *mc; 1013 int rv = 0; 1014 1015 idev = in6_dev_get(dev); 1016 if (idev) { 1017 read_lock_bh(&idev->lock); 1018 for (mc = idev->mc_list; mc; mc=mc->next) { 1019 if (ipv6_addr_equal(&mc->mca_addr, group)) 1020 break; 1021 } 1022 if (mc) { 1023 if (src_addr && !ipv6_addr_any(src_addr)) { 1024 struct ip6_sf_list *psf; 1025 1026 spin_lock_bh(&mc->mca_lock); 1027 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1028 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1029 break; 1030 } 1031 if (psf) 1032 rv = psf->sf_count[MCAST_INCLUDE] || 1033 psf->sf_count[MCAST_EXCLUDE] != 1034 mc->mca_sfcount[MCAST_EXCLUDE]; 1035 else 1036 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1037 spin_unlock_bh(&mc->mca_lock); 1038 } else 1039 rv = 1; /* don't filter unspecified source */ 1040 } 1041 read_unlock_bh(&idev->lock); 1042 in6_dev_put(idev); 1043 } 1044 return rv; 1045 } 1046 1047 static void mld_gq_start_timer(struct inet6_dev *idev) 1048 { 1049 int tv = net_random() % idev->mc_maxdelay; 1050 1051 idev->mc_gq_running = 1; 1052 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1053 in6_dev_hold(idev); 1054 } 1055 1056 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1057 { 1058 int tv = net_random() % delay; 1059 1060 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1061 in6_dev_hold(idev); 1062 } 1063 1064 /* 1065 * IGMP handling (alias multicast ICMPv6 messages) 1066 */ 1067 1068 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1069 { 1070 unsigned long delay = resptime; 1071 1072 /* Do not start timer for these addresses */ 1073 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1074 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1075 return; 1076 1077 if (del_timer(&ma->mca_timer)) { 1078 atomic_dec(&ma->mca_refcnt); 1079 delay = ma->mca_timer.expires - jiffies; 1080 } 1081 1082 if (delay >= resptime) { 1083 if (resptime) 1084 delay = net_random() % resptime; 1085 else 1086 delay = 1; 1087 } 1088 ma->mca_timer.expires = jiffies + delay; 1089 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1090 atomic_inc(&ma->mca_refcnt); 1091 ma->mca_flags |= MAF_TIMER_RUNNING; 1092 } 1093 1094 /* mark EXCLUDE-mode sources */ 1095 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1096 struct in6_addr *srcs) 1097 { 1098 struct ip6_sf_list *psf; 1099 int i, scount; 1100 1101 scount = 0; 1102 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1103 if (scount == nsrcs) 1104 break; 1105 for (i=0; i<nsrcs; i++) { 1106 /* skip inactive filters */ 1107 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1108 pmc->mca_sfcount[MCAST_EXCLUDE] != 1109 psf->sf_count[MCAST_EXCLUDE]) 1110 continue; 1111 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1112 scount++; 1113 break; 1114 } 1115 } 1116 } 1117 pmc->mca_flags &= ~MAF_GSQUERY; 1118 if (scount == nsrcs) /* all sources excluded */ 1119 return 0; 1120 return 1; 1121 } 1122 1123 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1124 struct in6_addr *srcs) 1125 { 1126 struct ip6_sf_list *psf; 1127 int i, scount; 1128 1129 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1130 return mld_xmarksources(pmc, nsrcs, srcs); 1131 1132 /* mark INCLUDE-mode sources */ 1133 1134 scount = 0; 1135 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1136 if (scount == nsrcs) 1137 break; 1138 for (i=0; i<nsrcs; i++) { 1139 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1140 psf->sf_gsresp = 1; 1141 scount++; 1142 break; 1143 } 1144 } 1145 } 1146 if (!scount) { 1147 pmc->mca_flags &= ~MAF_GSQUERY; 1148 return 0; 1149 } 1150 pmc->mca_flags |= MAF_GSQUERY; 1151 return 1; 1152 } 1153 1154 int igmp6_event_query(struct sk_buff *skb) 1155 { 1156 struct mld2_query *mlh2 = NULL; 1157 struct ifmcaddr6 *ma; 1158 struct in6_addr *group; 1159 unsigned long max_delay; 1160 struct inet6_dev *idev; 1161 struct icmp6hdr *hdr; 1162 int group_type; 1163 int mark = 0; 1164 int len; 1165 1166 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1167 return -EINVAL; 1168 1169 /* compute payload length excluding extension headers */ 1170 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); 1171 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; 1172 1173 /* Drop queries with not link local source */ 1174 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL)) 1175 return -EINVAL; 1176 1177 idev = in6_dev_get(skb->dev); 1178 1179 if (idev == NULL) 1180 return 0; 1181 1182 hdr = (struct icmp6hdr *) skb->h.raw; 1183 group = (struct in6_addr *) (hdr + 1); 1184 group_type = ipv6_addr_type(group); 1185 1186 if (group_type != IPV6_ADDR_ANY && 1187 !(group_type&IPV6_ADDR_MULTICAST)) { 1188 in6_dev_put(idev); 1189 return -EINVAL; 1190 } 1191 1192 if (len == 24) { 1193 int switchback; 1194 /* MLDv1 router present */ 1195 1196 /* Translate milliseconds to jiffies */ 1197 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1198 1199 switchback = (idev->mc_qrv + 1) * max_delay; 1200 idev->mc_v1_seen = jiffies + switchback; 1201 1202 /* cancel the interface change timer */ 1203 idev->mc_ifc_count = 0; 1204 if (del_timer(&idev->mc_ifc_timer)) 1205 __in6_dev_put(idev); 1206 /* clear deleted report items */ 1207 mld_clear_delrec(idev); 1208 } else if (len >= 28) { 1209 int srcs_offset = sizeof(struct mld2_query) - 1210 sizeof(struct icmp6hdr); 1211 if (!pskb_may_pull(skb, srcs_offset)) { 1212 in6_dev_put(idev); 1213 return -EINVAL; 1214 } 1215 mlh2 = (struct mld2_query *) skb->h.raw; 1216 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1217 if (!max_delay) 1218 max_delay = 1; 1219 idev->mc_maxdelay = max_delay; 1220 if (mlh2->qrv) 1221 idev->mc_qrv = mlh2->qrv; 1222 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1223 if (mlh2->nsrcs) { 1224 in6_dev_put(idev); 1225 return -EINVAL; /* no sources allowed */ 1226 } 1227 mld_gq_start_timer(idev); 1228 in6_dev_put(idev); 1229 return 0; 1230 } 1231 /* mark sources to include, if group & source-specific */ 1232 if (mlh2->nsrcs != 0) { 1233 if (!pskb_may_pull(skb, srcs_offset + 1234 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1235 in6_dev_put(idev); 1236 return -EINVAL; 1237 } 1238 mlh2 = (struct mld2_query *) skb->h.raw; 1239 mark = 1; 1240 } 1241 } else { 1242 in6_dev_put(idev); 1243 return -EINVAL; 1244 } 1245 1246 read_lock_bh(&idev->lock); 1247 if (group_type == IPV6_ADDR_ANY) { 1248 for (ma = idev->mc_list; ma; ma=ma->next) { 1249 spin_lock_bh(&ma->mca_lock); 1250 igmp6_group_queried(ma, max_delay); 1251 spin_unlock_bh(&ma->mca_lock); 1252 } 1253 } else { 1254 for (ma = idev->mc_list; ma; ma=ma->next) { 1255 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1256 continue; 1257 spin_lock_bh(&ma->mca_lock); 1258 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1259 /* gsquery <- gsquery && mark */ 1260 if (!mark) 1261 ma->mca_flags &= ~MAF_GSQUERY; 1262 } else { 1263 /* gsquery <- mark */ 1264 if (mark) 1265 ma->mca_flags |= MAF_GSQUERY; 1266 else 1267 ma->mca_flags &= ~MAF_GSQUERY; 1268 } 1269 if (!(ma->mca_flags & MAF_GSQUERY) || 1270 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1271 igmp6_group_queried(ma, max_delay); 1272 spin_unlock_bh(&ma->mca_lock); 1273 break; 1274 } 1275 } 1276 read_unlock_bh(&idev->lock); 1277 in6_dev_put(idev); 1278 1279 return 0; 1280 } 1281 1282 1283 int igmp6_event_report(struct sk_buff *skb) 1284 { 1285 struct ifmcaddr6 *ma; 1286 struct in6_addr *addrp; 1287 struct inet6_dev *idev; 1288 struct icmp6hdr *hdr; 1289 int addr_type; 1290 1291 /* Our own report looped back. Ignore it. */ 1292 if (skb->pkt_type == PACKET_LOOPBACK) 1293 return 0; 1294 1295 /* send our report if the MC router may not have heard this report */ 1296 if (skb->pkt_type != PACKET_MULTICAST && 1297 skb->pkt_type != PACKET_BROADCAST) 1298 return 0; 1299 1300 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1301 return -EINVAL; 1302 1303 hdr = (struct icmp6hdr*) skb->h.raw; 1304 1305 /* Drop reports with not link local source */ 1306 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); 1307 if (addr_type != IPV6_ADDR_ANY && 1308 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1309 return -EINVAL; 1310 1311 addrp = (struct in6_addr *) (hdr + 1); 1312 1313 idev = in6_dev_get(skb->dev); 1314 if (idev == NULL) 1315 return -ENODEV; 1316 1317 /* 1318 * Cancel the timer for this group 1319 */ 1320 1321 read_lock_bh(&idev->lock); 1322 for (ma = idev->mc_list; ma; ma=ma->next) { 1323 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1324 spin_lock(&ma->mca_lock); 1325 if (del_timer(&ma->mca_timer)) 1326 atomic_dec(&ma->mca_refcnt); 1327 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1328 spin_unlock(&ma->mca_lock); 1329 break; 1330 } 1331 } 1332 read_unlock_bh(&idev->lock); 1333 in6_dev_put(idev); 1334 return 0; 1335 } 1336 1337 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1338 int gdeleted, int sdeleted) 1339 { 1340 switch (type) { 1341 case MLD2_MODE_IS_INCLUDE: 1342 case MLD2_MODE_IS_EXCLUDE: 1343 if (gdeleted || sdeleted) 1344 return 0; 1345 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1346 if (pmc->mca_sfmode == MCAST_INCLUDE) 1347 return 1; 1348 /* don't include if this source is excluded 1349 * in all filters 1350 */ 1351 if (psf->sf_count[MCAST_INCLUDE]) 1352 return type == MLD2_MODE_IS_INCLUDE; 1353 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1354 psf->sf_count[MCAST_EXCLUDE]; 1355 } 1356 return 0; 1357 case MLD2_CHANGE_TO_INCLUDE: 1358 if (gdeleted || sdeleted) 1359 return 0; 1360 return psf->sf_count[MCAST_INCLUDE] != 0; 1361 case MLD2_CHANGE_TO_EXCLUDE: 1362 if (gdeleted || sdeleted) 1363 return 0; 1364 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1365 psf->sf_count[MCAST_INCLUDE]) 1366 return 0; 1367 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1368 psf->sf_count[MCAST_EXCLUDE]; 1369 case MLD2_ALLOW_NEW_SOURCES: 1370 if (gdeleted || !psf->sf_crcount) 1371 return 0; 1372 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1373 case MLD2_BLOCK_OLD_SOURCES: 1374 if (pmc->mca_sfmode == MCAST_INCLUDE) 1375 return gdeleted || (psf->sf_crcount && sdeleted); 1376 return psf->sf_crcount && !gdeleted && !sdeleted; 1377 } 1378 return 0; 1379 } 1380 1381 static int 1382 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1383 { 1384 struct ip6_sf_list *psf; 1385 int scount = 0; 1386 1387 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1388 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1389 continue; 1390 scount++; 1391 } 1392 return scount; 1393 } 1394 1395 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1396 { 1397 struct sock *sk = igmp6_socket->sk; 1398 struct sk_buff *skb; 1399 struct mld2_report *pmr; 1400 struct in6_addr addr_buf; 1401 int err; 1402 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1403 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1404 IPV6_TLV_PADN, 0 }; 1405 1406 /* we assume size > sizeof(ra) here */ 1407 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1408 1409 if (skb == 0) 1410 return NULL; 1411 1412 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1413 1414 if (ipv6_get_lladdr(dev, &addr_buf)) { 1415 /* <draft-ietf-magma-mld-source-05.txt>: 1416 * use unspecified address as the source address 1417 * when a valid link-local address is not available. 1418 */ 1419 memset(&addr_buf, 0, sizeof(addr_buf)); 1420 } 1421 1422 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1423 1424 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1425 1426 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); 1427 skb->h.raw = (unsigned char *)pmr; 1428 pmr->type = ICMPV6_MLD2_REPORT; 1429 pmr->resv1 = 0; 1430 pmr->csum = 0; 1431 pmr->resv2 = 0; 1432 pmr->ngrec = 0; 1433 return skb; 1434 } 1435 1436 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1437 { 1438 struct net_device *dev = skb->dev; 1439 1440 if (dev->hard_header) { 1441 unsigned char ha[MAX_ADDR_LEN]; 1442 int err; 1443 1444 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1); 1445 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); 1446 if (err < 0) { 1447 kfree_skb(skb); 1448 return err; 1449 } 1450 } 1451 return dev_queue_xmit(skb); 1452 } 1453 1454 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1455 { 1456 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1457 mld_dev_queue_xmit2); 1458 } 1459 1460 static void mld_sendpack(struct sk_buff *skb) 1461 { 1462 struct ipv6hdr *pip6 = skb->nh.ipv6h; 1463 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; 1464 int payload_len, mldlen; 1465 struct inet6_dev *idev = in6_dev_get(skb->dev); 1466 int err; 1467 1468 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1469 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - 1470 sizeof(struct ipv6hdr); 1471 mldlen = skb->tail - skb->h.raw; 1472 pip6->payload_len = htons(payload_len); 1473 1474 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1475 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); 1476 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1477 mld_dev_queue_xmit); 1478 if (!err) { 1479 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); 1480 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1481 } else 1482 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1483 1484 if (likely(idev != NULL)) 1485 in6_dev_put(idev); 1486 } 1487 1488 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1489 { 1490 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1491 } 1492 1493 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1494 int type, struct mld2_grec **ppgr) 1495 { 1496 struct net_device *dev = pmc->idev->dev; 1497 struct mld2_report *pmr; 1498 struct mld2_grec *pgr; 1499 1500 if (!skb) 1501 skb = mld_newpack(dev, dev->mtu); 1502 if (!skb) 1503 return NULL; 1504 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1505 pgr->grec_type = type; 1506 pgr->grec_auxwords = 0; 1507 pgr->grec_nsrcs = 0; 1508 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1509 pmr = (struct mld2_report *)skb->h.raw; 1510 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1511 *ppgr = pgr; 1512 return skb; 1513 } 1514 1515 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1516 skb_tailroom(skb)) : 0) 1517 1518 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1519 int type, int gdeleted, int sdeleted) 1520 { 1521 struct net_device *dev = pmc->idev->dev; 1522 struct mld2_report *pmr; 1523 struct mld2_grec *pgr = NULL; 1524 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1525 int scount, stotal, first, isquery, truncate; 1526 1527 if (pmc->mca_flags & MAF_NOREPORT) 1528 return skb; 1529 1530 isquery = type == MLD2_MODE_IS_INCLUDE || 1531 type == MLD2_MODE_IS_EXCLUDE; 1532 truncate = type == MLD2_MODE_IS_EXCLUDE || 1533 type == MLD2_CHANGE_TO_EXCLUDE; 1534 1535 stotal = scount = 0; 1536 1537 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1538 1539 if (!*psf_list) 1540 goto empty_source; 1541 1542 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; 1543 1544 /* EX and TO_EX get a fresh packet, if needed */ 1545 if (truncate) { 1546 if (pmr && pmr->ngrec && 1547 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1548 if (skb) 1549 mld_sendpack(skb); 1550 skb = mld_newpack(dev, dev->mtu); 1551 } 1552 } 1553 first = 1; 1554 psf_prev = NULL; 1555 for (psf=*psf_list; psf; psf=psf_next) { 1556 struct in6_addr *psrc; 1557 1558 psf_next = psf->sf_next; 1559 1560 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1561 psf_prev = psf; 1562 continue; 1563 } 1564 1565 /* clear marks on query responses */ 1566 if (isquery) 1567 psf->sf_gsresp = 0; 1568 1569 if (AVAILABLE(skb) < sizeof(*psrc) + 1570 first*sizeof(struct mld2_grec)) { 1571 if (truncate && !first) 1572 break; /* truncate these */ 1573 if (pgr) 1574 pgr->grec_nsrcs = htons(scount); 1575 if (skb) 1576 mld_sendpack(skb); 1577 skb = mld_newpack(dev, dev->mtu); 1578 first = 1; 1579 scount = 0; 1580 } 1581 if (first) { 1582 skb = add_grhead(skb, pmc, type, &pgr); 1583 first = 0; 1584 } 1585 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1586 *psrc = psf->sf_addr; 1587 scount++; stotal++; 1588 if ((type == MLD2_ALLOW_NEW_SOURCES || 1589 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1590 psf->sf_crcount--; 1591 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1592 if (psf_prev) 1593 psf_prev->sf_next = psf->sf_next; 1594 else 1595 *psf_list = psf->sf_next; 1596 kfree(psf); 1597 continue; 1598 } 1599 } 1600 psf_prev = psf; 1601 } 1602 1603 empty_source: 1604 if (!stotal) { 1605 if (type == MLD2_ALLOW_NEW_SOURCES || 1606 type == MLD2_BLOCK_OLD_SOURCES) 1607 return skb; 1608 if (pmc->mca_crcount || isquery) { 1609 /* make sure we have room for group header */ 1610 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1611 mld_sendpack(skb); 1612 skb = NULL; /* add_grhead will get a new one */ 1613 } 1614 skb = add_grhead(skb, pmc, type, &pgr); 1615 } 1616 } 1617 if (pgr) 1618 pgr->grec_nsrcs = htons(scount); 1619 1620 if (isquery) 1621 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1622 return skb; 1623 } 1624 1625 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1626 { 1627 struct sk_buff *skb = NULL; 1628 int type; 1629 1630 if (!pmc) { 1631 read_lock_bh(&idev->lock); 1632 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1633 if (pmc->mca_flags & MAF_NOREPORT) 1634 continue; 1635 spin_lock_bh(&pmc->mca_lock); 1636 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1637 type = MLD2_MODE_IS_EXCLUDE; 1638 else 1639 type = MLD2_MODE_IS_INCLUDE; 1640 skb = add_grec(skb, pmc, type, 0, 0); 1641 spin_unlock_bh(&pmc->mca_lock); 1642 } 1643 read_unlock_bh(&idev->lock); 1644 } else { 1645 spin_lock_bh(&pmc->mca_lock); 1646 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1647 type = MLD2_MODE_IS_EXCLUDE; 1648 else 1649 type = MLD2_MODE_IS_INCLUDE; 1650 skb = add_grec(skb, pmc, type, 0, 0); 1651 spin_unlock_bh(&pmc->mca_lock); 1652 } 1653 if (skb) 1654 mld_sendpack(skb); 1655 } 1656 1657 /* 1658 * remove zero-count source records from a source filter list 1659 */ 1660 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1661 { 1662 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1663 1664 psf_prev = NULL; 1665 for (psf=*ppsf; psf; psf = psf_next) { 1666 psf_next = psf->sf_next; 1667 if (psf->sf_crcount == 0) { 1668 if (psf_prev) 1669 psf_prev->sf_next = psf->sf_next; 1670 else 1671 *ppsf = psf->sf_next; 1672 kfree(psf); 1673 } else 1674 psf_prev = psf; 1675 } 1676 } 1677 1678 static void mld_send_cr(struct inet6_dev *idev) 1679 { 1680 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1681 struct sk_buff *skb = NULL; 1682 int type, dtype; 1683 1684 read_lock_bh(&idev->lock); 1685 write_lock_bh(&idev->mc_lock); 1686 1687 /* deleted MCA's */ 1688 pmc_prev = NULL; 1689 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1690 pmc_next = pmc->next; 1691 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1692 type = MLD2_BLOCK_OLD_SOURCES; 1693 dtype = MLD2_BLOCK_OLD_SOURCES; 1694 skb = add_grec(skb, pmc, type, 1, 0); 1695 skb = add_grec(skb, pmc, dtype, 1, 1); 1696 } 1697 if (pmc->mca_crcount) { 1698 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1699 type = MLD2_CHANGE_TO_INCLUDE; 1700 skb = add_grec(skb, pmc, type, 1, 0); 1701 } 1702 pmc->mca_crcount--; 1703 if (pmc->mca_crcount == 0) { 1704 mld_clear_zeros(&pmc->mca_tomb); 1705 mld_clear_zeros(&pmc->mca_sources); 1706 } 1707 } 1708 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1709 !pmc->mca_sources) { 1710 if (pmc_prev) 1711 pmc_prev->next = pmc_next; 1712 else 1713 idev->mc_tomb = pmc_next; 1714 in6_dev_put(pmc->idev); 1715 kfree(pmc); 1716 } else 1717 pmc_prev = pmc; 1718 } 1719 write_unlock_bh(&idev->mc_lock); 1720 1721 /* change recs */ 1722 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1723 spin_lock_bh(&pmc->mca_lock); 1724 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1725 type = MLD2_BLOCK_OLD_SOURCES; 1726 dtype = MLD2_ALLOW_NEW_SOURCES; 1727 } else { 1728 type = MLD2_ALLOW_NEW_SOURCES; 1729 dtype = MLD2_BLOCK_OLD_SOURCES; 1730 } 1731 skb = add_grec(skb, pmc, type, 0, 0); 1732 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1733 1734 /* filter mode changes */ 1735 if (pmc->mca_crcount) { 1736 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1737 type = MLD2_CHANGE_TO_EXCLUDE; 1738 else 1739 type = MLD2_CHANGE_TO_INCLUDE; 1740 skb = add_grec(skb, pmc, type, 0, 0); 1741 pmc->mca_crcount--; 1742 } 1743 spin_unlock_bh(&pmc->mca_lock); 1744 } 1745 read_unlock_bh(&idev->lock); 1746 if (!skb) 1747 return; 1748 (void) mld_sendpack(skb); 1749 } 1750 1751 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1752 { 1753 struct sock *sk = igmp6_socket->sk; 1754 struct inet6_dev *idev; 1755 struct sk_buff *skb; 1756 struct icmp6hdr *hdr; 1757 struct in6_addr *snd_addr; 1758 struct in6_addr *addrp; 1759 struct in6_addr addr_buf; 1760 struct in6_addr all_routers; 1761 int err, len, payload_len, full_len; 1762 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1763 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1764 IPV6_TLV_PADN, 0 }; 1765 1766 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1767 snd_addr = addr; 1768 if (type == ICMPV6_MGM_REDUCTION) { 1769 snd_addr = &all_routers; 1770 ipv6_addr_all_routers(&all_routers); 1771 } 1772 1773 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1774 payload_len = len + sizeof(ra); 1775 full_len = sizeof(struct ipv6hdr) + payload_len; 1776 1777 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1778 1779 if (skb == NULL) { 1780 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1781 return; 1782 } 1783 1784 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1785 1786 if (ipv6_get_lladdr(dev, &addr_buf)) { 1787 /* <draft-ietf-magma-mld-source-05.txt>: 1788 * use unspecified address as the source address 1789 * when a valid link-local address is not available. 1790 */ 1791 memset(&addr_buf, 0, sizeof(addr_buf)); 1792 } 1793 1794 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1795 1796 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1797 1798 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1799 memset(hdr, 0, sizeof(struct icmp6hdr)); 1800 hdr->icmp6_type = type; 1801 1802 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1803 ipv6_addr_copy(addrp, addr); 1804 1805 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1806 IPPROTO_ICMPV6, 1807 csum_partial((__u8 *) hdr, len, 0)); 1808 1809 idev = in6_dev_get(skb->dev); 1810 1811 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1812 mld_dev_queue_xmit); 1813 if (!err) { 1814 if (type == ICMPV6_MGM_REDUCTION) 1815 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); 1816 else 1817 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); 1818 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1819 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1820 } else 1821 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1822 1823 if (likely(idev != NULL)) 1824 in6_dev_put(idev); 1825 return; 1826 } 1827 1828 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1829 struct in6_addr *psfsrc) 1830 { 1831 struct ip6_sf_list *psf, *psf_prev; 1832 int rv = 0; 1833 1834 psf_prev = NULL; 1835 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1836 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1837 break; 1838 psf_prev = psf; 1839 } 1840 if (!psf || psf->sf_count[sfmode] == 0) { 1841 /* source filter not found, or count wrong => bug */ 1842 return -ESRCH; 1843 } 1844 psf->sf_count[sfmode]--; 1845 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1846 struct inet6_dev *idev = pmc->idev; 1847 1848 /* no more filters for this source */ 1849 if (psf_prev) 1850 psf_prev->sf_next = psf->sf_next; 1851 else 1852 pmc->mca_sources = psf->sf_next; 1853 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1854 !MLD_V1_SEEN(idev)) { 1855 psf->sf_crcount = idev->mc_qrv; 1856 psf->sf_next = pmc->mca_tomb; 1857 pmc->mca_tomb = psf; 1858 rv = 1; 1859 } else 1860 kfree(psf); 1861 } 1862 return rv; 1863 } 1864 1865 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1866 int sfmode, int sfcount, struct in6_addr *psfsrc, 1867 int delta) 1868 { 1869 struct ifmcaddr6 *pmc; 1870 int changerec = 0; 1871 int i, err; 1872 1873 if (!idev) 1874 return -ENODEV; 1875 read_lock_bh(&idev->lock); 1876 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1877 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1878 break; 1879 } 1880 if (!pmc) { 1881 /* MCA not found?? bug */ 1882 read_unlock_bh(&idev->lock); 1883 return -ESRCH; 1884 } 1885 spin_lock_bh(&pmc->mca_lock); 1886 sf_markstate(pmc); 1887 if (!delta) { 1888 if (!pmc->mca_sfcount[sfmode]) { 1889 spin_unlock_bh(&pmc->mca_lock); 1890 read_unlock_bh(&idev->lock); 1891 return -EINVAL; 1892 } 1893 pmc->mca_sfcount[sfmode]--; 1894 } 1895 err = 0; 1896 for (i=0; i<sfcount; i++) { 1897 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1898 1899 changerec |= rv > 0; 1900 if (!err && rv < 0) 1901 err = rv; 1902 } 1903 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1904 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1905 pmc->mca_sfcount[MCAST_INCLUDE]) { 1906 struct ip6_sf_list *psf; 1907 1908 /* filter mode change */ 1909 pmc->mca_sfmode = MCAST_INCLUDE; 1910 pmc->mca_crcount = idev->mc_qrv; 1911 idev->mc_ifc_count = pmc->mca_crcount; 1912 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1913 psf->sf_crcount = 0; 1914 mld_ifc_event(pmc->idev); 1915 } else if (sf_setstate(pmc) || changerec) 1916 mld_ifc_event(pmc->idev); 1917 spin_unlock_bh(&pmc->mca_lock); 1918 read_unlock_bh(&idev->lock); 1919 return err; 1920 } 1921 1922 /* 1923 * Add multicast single-source filter to the interface list 1924 */ 1925 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1926 struct in6_addr *psfsrc, int delta) 1927 { 1928 struct ip6_sf_list *psf, *psf_prev; 1929 1930 psf_prev = NULL; 1931 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1932 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1933 break; 1934 psf_prev = psf; 1935 } 1936 if (!psf) { 1937 psf = kmalloc(sizeof(*psf), GFP_ATOMIC); 1938 if (!psf) 1939 return -ENOBUFS; 1940 memset(psf, 0, sizeof(*psf)); 1941 psf->sf_addr = *psfsrc; 1942 if (psf_prev) { 1943 psf_prev->sf_next = psf; 1944 } else 1945 pmc->mca_sources = psf; 1946 } 1947 psf->sf_count[sfmode]++; 1948 return 0; 1949 } 1950 1951 static void sf_markstate(struct ifmcaddr6 *pmc) 1952 { 1953 struct ip6_sf_list *psf; 1954 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1955 1956 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1957 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1958 psf->sf_oldin = mca_xcount == 1959 psf->sf_count[MCAST_EXCLUDE] && 1960 !psf->sf_count[MCAST_INCLUDE]; 1961 } else 1962 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1963 } 1964 1965 static int sf_setstate(struct ifmcaddr6 *pmc) 1966 { 1967 struct ip6_sf_list *psf, *dpsf; 1968 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1969 int qrv = pmc->idev->mc_qrv; 1970 int new_in, rv; 1971 1972 rv = 0; 1973 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1974 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1975 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1976 !psf->sf_count[MCAST_INCLUDE]; 1977 } else 1978 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1979 if (new_in) { 1980 if (!psf->sf_oldin) { 1981 struct ip6_sf_list *prev = NULL; 1982 1983 for (dpsf=pmc->mca_tomb; dpsf; 1984 dpsf=dpsf->sf_next) { 1985 if (ipv6_addr_equal(&dpsf->sf_addr, 1986 &psf->sf_addr)) 1987 break; 1988 prev = dpsf; 1989 } 1990 if (dpsf) { 1991 if (prev) 1992 prev->sf_next = dpsf->sf_next; 1993 else 1994 pmc->mca_tomb = dpsf->sf_next; 1995 kfree(dpsf); 1996 } 1997 psf->sf_crcount = qrv; 1998 rv++; 1999 } 2000 } else if (psf->sf_oldin) { 2001 psf->sf_crcount = 0; 2002 /* 2003 * add or update "delete" records if an active filter 2004 * is now inactive 2005 */ 2006 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2007 if (ipv6_addr_equal(&dpsf->sf_addr, 2008 &psf->sf_addr)) 2009 break; 2010 if (!dpsf) { 2011 dpsf = (struct ip6_sf_list *) 2012 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2013 if (!dpsf) 2014 continue; 2015 *dpsf = *psf; 2016 /* pmc->mca_lock held by callers */ 2017 dpsf->sf_next = pmc->mca_tomb; 2018 pmc->mca_tomb = dpsf; 2019 } 2020 dpsf->sf_crcount = qrv; 2021 rv++; 2022 } 2023 } 2024 return rv; 2025 } 2026 2027 /* 2028 * Add multicast source filter list to the interface list 2029 */ 2030 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2031 int sfmode, int sfcount, struct in6_addr *psfsrc, 2032 int delta) 2033 { 2034 struct ifmcaddr6 *pmc; 2035 int isexclude; 2036 int i, err; 2037 2038 if (!idev) 2039 return -ENODEV; 2040 read_lock_bh(&idev->lock); 2041 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2042 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2043 break; 2044 } 2045 if (!pmc) { 2046 /* MCA not found?? bug */ 2047 read_unlock_bh(&idev->lock); 2048 return -ESRCH; 2049 } 2050 spin_lock_bh(&pmc->mca_lock); 2051 2052 sf_markstate(pmc); 2053 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2054 if (!delta) 2055 pmc->mca_sfcount[sfmode]++; 2056 err = 0; 2057 for (i=0; i<sfcount; i++) { 2058 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2059 if (err) 2060 break; 2061 } 2062 if (err) { 2063 int j; 2064 2065 if (!delta) 2066 pmc->mca_sfcount[sfmode]--; 2067 for (j=0; j<i; j++) 2068 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2069 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2070 struct inet6_dev *idev = pmc->idev; 2071 struct ip6_sf_list *psf; 2072 2073 /* filter mode change */ 2074 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2075 pmc->mca_sfmode = MCAST_EXCLUDE; 2076 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2077 pmc->mca_sfmode = MCAST_INCLUDE; 2078 /* else no filters; keep old mode for reports */ 2079 2080 pmc->mca_crcount = idev->mc_qrv; 2081 idev->mc_ifc_count = pmc->mca_crcount; 2082 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2083 psf->sf_crcount = 0; 2084 mld_ifc_event(idev); 2085 } else if (sf_setstate(pmc)) 2086 mld_ifc_event(idev); 2087 spin_unlock_bh(&pmc->mca_lock); 2088 read_unlock_bh(&idev->lock); 2089 return err; 2090 } 2091 2092 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2093 { 2094 struct ip6_sf_list *psf, *nextpsf; 2095 2096 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2097 nextpsf = psf->sf_next; 2098 kfree(psf); 2099 } 2100 pmc->mca_tomb = NULL; 2101 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2102 nextpsf = psf->sf_next; 2103 kfree(psf); 2104 } 2105 pmc->mca_sources = NULL; 2106 pmc->mca_sfmode = MCAST_EXCLUDE; 2107 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2108 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2109 } 2110 2111 2112 static void igmp6_join_group(struct ifmcaddr6 *ma) 2113 { 2114 unsigned long delay; 2115 2116 if (ma->mca_flags & MAF_NOREPORT) 2117 return; 2118 2119 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2120 2121 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2122 2123 spin_lock_bh(&ma->mca_lock); 2124 if (del_timer(&ma->mca_timer)) { 2125 atomic_dec(&ma->mca_refcnt); 2126 delay = ma->mca_timer.expires - jiffies; 2127 } 2128 2129 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2130 atomic_inc(&ma->mca_refcnt); 2131 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2132 spin_unlock_bh(&ma->mca_lock); 2133 } 2134 2135 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2136 struct inet6_dev *idev) 2137 { 2138 int err; 2139 2140 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2141 * so no other readers or writers of iml or its sflist 2142 */ 2143 if (iml->sflist == 0) { 2144 /* any-source empty exclude case */ 2145 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2146 } 2147 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2148 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2149 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2150 iml->sflist = NULL; 2151 return err; 2152 } 2153 2154 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2155 { 2156 if (MLD_V1_SEEN(ma->idev)) { 2157 if (ma->mca_flags & MAF_LAST_REPORTER) 2158 igmp6_send(&ma->mca_addr, ma->idev->dev, 2159 ICMPV6_MGM_REDUCTION); 2160 } else { 2161 mld_add_delrec(ma->idev, ma); 2162 mld_ifc_event(ma->idev); 2163 } 2164 } 2165 2166 static void mld_gq_timer_expire(unsigned long data) 2167 { 2168 struct inet6_dev *idev = (struct inet6_dev *)data; 2169 2170 idev->mc_gq_running = 0; 2171 mld_send_report(idev, NULL); 2172 __in6_dev_put(idev); 2173 } 2174 2175 static void mld_ifc_timer_expire(unsigned long data) 2176 { 2177 struct inet6_dev *idev = (struct inet6_dev *)data; 2178 2179 mld_send_cr(idev); 2180 if (idev->mc_ifc_count) { 2181 idev->mc_ifc_count--; 2182 if (idev->mc_ifc_count) 2183 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2184 } 2185 __in6_dev_put(idev); 2186 } 2187 2188 static void mld_ifc_event(struct inet6_dev *idev) 2189 { 2190 if (MLD_V1_SEEN(idev)) 2191 return; 2192 idev->mc_ifc_count = idev->mc_qrv; 2193 mld_ifc_start_timer(idev, 1); 2194 } 2195 2196 2197 static void igmp6_timer_handler(unsigned long data) 2198 { 2199 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2200 2201 if (MLD_V1_SEEN(ma->idev)) 2202 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2203 else 2204 mld_send_report(ma->idev, ma); 2205 2206 spin_lock(&ma->mca_lock); 2207 ma->mca_flags |= MAF_LAST_REPORTER; 2208 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2209 spin_unlock(&ma->mca_lock); 2210 ma_put(ma); 2211 } 2212 2213 /* Device going down */ 2214 2215 void ipv6_mc_down(struct inet6_dev *idev) 2216 { 2217 struct ifmcaddr6 *i; 2218 2219 /* Withdraw multicast list */ 2220 2221 read_lock_bh(&idev->lock); 2222 idev->mc_ifc_count = 0; 2223 if (del_timer(&idev->mc_ifc_timer)) 2224 __in6_dev_put(idev); 2225 idev->mc_gq_running = 0; 2226 if (del_timer(&idev->mc_gq_timer)) 2227 __in6_dev_put(idev); 2228 2229 for (i = idev->mc_list; i; i=i->next) 2230 igmp6_group_dropped(i); 2231 read_unlock_bh(&idev->lock); 2232 2233 mld_clear_delrec(idev); 2234 } 2235 2236 2237 /* Device going up */ 2238 2239 void ipv6_mc_up(struct inet6_dev *idev) 2240 { 2241 struct ifmcaddr6 *i; 2242 2243 /* Install multicast list, except for all-nodes (already installed) */ 2244 2245 read_lock_bh(&idev->lock); 2246 for (i = idev->mc_list; i; i=i->next) 2247 igmp6_group_added(i); 2248 read_unlock_bh(&idev->lock); 2249 } 2250 2251 /* IPv6 device initialization. */ 2252 2253 void ipv6_mc_init_dev(struct inet6_dev *idev) 2254 { 2255 struct in6_addr maddr; 2256 2257 write_lock_bh(&idev->lock); 2258 rwlock_init(&idev->mc_lock); 2259 idev->mc_gq_running = 0; 2260 init_timer(&idev->mc_gq_timer); 2261 idev->mc_gq_timer.data = (unsigned long) idev; 2262 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2263 idev->mc_tomb = NULL; 2264 idev->mc_ifc_count = 0; 2265 init_timer(&idev->mc_ifc_timer); 2266 idev->mc_ifc_timer.data = (unsigned long) idev; 2267 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2268 idev->mc_qrv = MLD_QRV_DEFAULT; 2269 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2270 idev->mc_v1_seen = 0; 2271 write_unlock_bh(&idev->lock); 2272 2273 /* Add all-nodes address. */ 2274 ipv6_addr_all_nodes(&maddr); 2275 ipv6_dev_mc_inc(idev->dev, &maddr); 2276 } 2277 2278 /* 2279 * Device is about to be destroyed: clean up. 2280 */ 2281 2282 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2283 { 2284 struct ifmcaddr6 *i; 2285 struct in6_addr maddr; 2286 2287 /* Deactivate timers */ 2288 ipv6_mc_down(idev); 2289 2290 /* Delete all-nodes address. */ 2291 ipv6_addr_all_nodes(&maddr); 2292 2293 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2294 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2295 * fail. 2296 */ 2297 __ipv6_dev_mc_dec(idev, &maddr); 2298 2299 if (idev->cnf.forwarding) { 2300 ipv6_addr_all_routers(&maddr); 2301 __ipv6_dev_mc_dec(idev, &maddr); 2302 } 2303 2304 write_lock_bh(&idev->lock); 2305 while ((i = idev->mc_list) != NULL) { 2306 idev->mc_list = i->next; 2307 write_unlock_bh(&idev->lock); 2308 2309 igmp6_group_dropped(i); 2310 ma_put(i); 2311 2312 write_lock_bh(&idev->lock); 2313 } 2314 write_unlock_bh(&idev->lock); 2315 } 2316 2317 #ifdef CONFIG_PROC_FS 2318 struct igmp6_mc_iter_state { 2319 struct net_device *dev; 2320 struct inet6_dev *idev; 2321 }; 2322 2323 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2324 2325 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2326 { 2327 struct ifmcaddr6 *im = NULL; 2328 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2329 2330 for (state->dev = dev_base, state->idev = NULL; 2331 state->dev; 2332 state->dev = state->dev->next) { 2333 struct inet6_dev *idev; 2334 idev = in6_dev_get(state->dev); 2335 if (!idev) 2336 continue; 2337 read_lock_bh(&idev->lock); 2338 im = idev->mc_list; 2339 if (im) { 2340 state->idev = idev; 2341 break; 2342 } 2343 read_unlock_bh(&idev->lock); 2344 in6_dev_put(idev); 2345 } 2346 return im; 2347 } 2348 2349 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2350 { 2351 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2352 2353 im = im->next; 2354 while (!im) { 2355 if (likely(state->idev != NULL)) { 2356 read_unlock_bh(&state->idev->lock); 2357 in6_dev_put(state->idev); 2358 } 2359 state->dev = state->dev->next; 2360 if (!state->dev) { 2361 state->idev = NULL; 2362 break; 2363 } 2364 state->idev = in6_dev_get(state->dev); 2365 if (!state->idev) 2366 continue; 2367 read_lock_bh(&state->idev->lock); 2368 im = state->idev->mc_list; 2369 } 2370 return im; 2371 } 2372 2373 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2374 { 2375 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2376 if (im) 2377 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2378 --pos; 2379 return pos ? NULL : im; 2380 } 2381 2382 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2383 { 2384 read_lock(&dev_base_lock); 2385 return igmp6_mc_get_idx(seq, *pos); 2386 } 2387 2388 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2389 { 2390 struct ifmcaddr6 *im; 2391 im = igmp6_mc_get_next(seq, v); 2392 ++*pos; 2393 return im; 2394 } 2395 2396 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2397 { 2398 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2399 if (likely(state->idev != NULL)) { 2400 read_unlock_bh(&state->idev->lock); 2401 in6_dev_put(state->idev); 2402 state->idev = NULL; 2403 } 2404 state->dev = NULL; 2405 read_unlock(&dev_base_lock); 2406 } 2407 2408 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2409 { 2410 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2411 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2412 2413 seq_printf(seq, 2414 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2415 state->dev->ifindex, state->dev->name, 2416 NIP6(im->mca_addr), 2417 im->mca_users, im->mca_flags, 2418 (im->mca_flags&MAF_TIMER_RUNNING) ? 2419 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2420 return 0; 2421 } 2422 2423 static struct seq_operations igmp6_mc_seq_ops = { 2424 .start = igmp6_mc_seq_start, 2425 .next = igmp6_mc_seq_next, 2426 .stop = igmp6_mc_seq_stop, 2427 .show = igmp6_mc_seq_show, 2428 }; 2429 2430 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2431 { 2432 struct seq_file *seq; 2433 int rc = -ENOMEM; 2434 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2435 2436 if (!s) 2437 goto out; 2438 2439 rc = seq_open(file, &igmp6_mc_seq_ops); 2440 if (rc) 2441 goto out_kfree; 2442 2443 seq = file->private_data; 2444 seq->private = s; 2445 memset(s, 0, sizeof(*s)); 2446 out: 2447 return rc; 2448 out_kfree: 2449 kfree(s); 2450 goto out; 2451 } 2452 2453 static struct file_operations igmp6_mc_seq_fops = { 2454 .owner = THIS_MODULE, 2455 .open = igmp6_mc_seq_open, 2456 .read = seq_read, 2457 .llseek = seq_lseek, 2458 .release = seq_release_private, 2459 }; 2460 2461 struct igmp6_mcf_iter_state { 2462 struct net_device *dev; 2463 struct inet6_dev *idev; 2464 struct ifmcaddr6 *im; 2465 }; 2466 2467 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2468 2469 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2470 { 2471 struct ip6_sf_list *psf = NULL; 2472 struct ifmcaddr6 *im = NULL; 2473 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2474 2475 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2476 state->dev; 2477 state->dev = state->dev->next) { 2478 struct inet6_dev *idev; 2479 idev = in6_dev_get(state->dev); 2480 if (unlikely(idev == NULL)) 2481 continue; 2482 read_lock_bh(&idev->lock); 2483 im = idev->mc_list; 2484 if (likely(im != NULL)) { 2485 spin_lock_bh(&im->mca_lock); 2486 psf = im->mca_sources; 2487 if (likely(psf != NULL)) { 2488 state->im = im; 2489 state->idev = idev; 2490 break; 2491 } 2492 spin_unlock_bh(&im->mca_lock); 2493 } 2494 read_unlock_bh(&idev->lock); 2495 in6_dev_put(idev); 2496 } 2497 return psf; 2498 } 2499 2500 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2501 { 2502 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2503 2504 psf = psf->sf_next; 2505 while (!psf) { 2506 spin_unlock_bh(&state->im->mca_lock); 2507 state->im = state->im->next; 2508 while (!state->im) { 2509 if (likely(state->idev != NULL)) { 2510 read_unlock_bh(&state->idev->lock); 2511 in6_dev_put(state->idev); 2512 } 2513 state->dev = state->dev->next; 2514 if (!state->dev) { 2515 state->idev = NULL; 2516 goto out; 2517 } 2518 state->idev = in6_dev_get(state->dev); 2519 if (!state->idev) 2520 continue; 2521 read_lock_bh(&state->idev->lock); 2522 state->im = state->idev->mc_list; 2523 } 2524 if (!state->im) 2525 break; 2526 spin_lock_bh(&state->im->mca_lock); 2527 psf = state->im->mca_sources; 2528 } 2529 out: 2530 return psf; 2531 } 2532 2533 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2534 { 2535 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2536 if (psf) 2537 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2538 --pos; 2539 return pos ? NULL : psf; 2540 } 2541 2542 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2543 { 2544 read_lock(&dev_base_lock); 2545 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2546 } 2547 2548 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2549 { 2550 struct ip6_sf_list *psf; 2551 if (v == SEQ_START_TOKEN) 2552 psf = igmp6_mcf_get_first(seq); 2553 else 2554 psf = igmp6_mcf_get_next(seq, v); 2555 ++*pos; 2556 return psf; 2557 } 2558 2559 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2560 { 2561 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2562 if (likely(state->im != NULL)) { 2563 spin_unlock_bh(&state->im->mca_lock); 2564 state->im = NULL; 2565 } 2566 if (likely(state->idev != NULL)) { 2567 read_unlock_bh(&state->idev->lock); 2568 in6_dev_put(state->idev); 2569 state->idev = NULL; 2570 } 2571 state->dev = NULL; 2572 read_unlock(&dev_base_lock); 2573 } 2574 2575 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2576 { 2577 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2578 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2579 2580 if (v == SEQ_START_TOKEN) { 2581 seq_printf(seq, 2582 "%3s %6s " 2583 "%32s %32s %6s %6s\n", "Idx", 2584 "Device", "Multicast Address", 2585 "Source Address", "INC", "EXC"); 2586 } else { 2587 seq_printf(seq, 2588 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n", 2589 state->dev->ifindex, state->dev->name, 2590 NIP6(state->im->mca_addr), 2591 NIP6(psf->sf_addr), 2592 psf->sf_count[MCAST_INCLUDE], 2593 psf->sf_count[MCAST_EXCLUDE]); 2594 } 2595 return 0; 2596 } 2597 2598 static struct seq_operations igmp6_mcf_seq_ops = { 2599 .start = igmp6_mcf_seq_start, 2600 .next = igmp6_mcf_seq_next, 2601 .stop = igmp6_mcf_seq_stop, 2602 .show = igmp6_mcf_seq_show, 2603 }; 2604 2605 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2606 { 2607 struct seq_file *seq; 2608 int rc = -ENOMEM; 2609 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2610 2611 if (!s) 2612 goto out; 2613 2614 rc = seq_open(file, &igmp6_mcf_seq_ops); 2615 if (rc) 2616 goto out_kfree; 2617 2618 seq = file->private_data; 2619 seq->private = s; 2620 memset(s, 0, sizeof(*s)); 2621 out: 2622 return rc; 2623 out_kfree: 2624 kfree(s); 2625 goto out; 2626 } 2627 2628 static struct file_operations igmp6_mcf_seq_fops = { 2629 .owner = THIS_MODULE, 2630 .open = igmp6_mcf_seq_open, 2631 .read = seq_read, 2632 .llseek = seq_lseek, 2633 .release = seq_release_private, 2634 }; 2635 #endif 2636 2637 int __init igmp6_init(struct net_proto_family *ops) 2638 { 2639 struct ipv6_pinfo *np; 2640 struct sock *sk; 2641 int err; 2642 2643 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2644 if (err < 0) { 2645 printk(KERN_ERR 2646 "Failed to initialize the IGMP6 control socket (err %d).\n", 2647 err); 2648 igmp6_socket = NULL; /* For safety. */ 2649 return err; 2650 } 2651 2652 sk = igmp6_socket->sk; 2653 sk->sk_allocation = GFP_ATOMIC; 2654 sk->sk_prot->unhash(sk); 2655 2656 np = inet6_sk(sk); 2657 np->hop_limit = 1; 2658 2659 #ifdef CONFIG_PROC_FS 2660 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2661 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2662 #endif 2663 2664 return 0; 2665 } 2666 2667 void igmp6_cleanup(void) 2668 { 2669 sock_release(igmp6_socket); 2670 igmp6_socket = NULL; /* for safety */ 2671 2672 #ifdef CONFIG_PROC_FS 2673 proc_net_remove("mcfilter6"); 2674 proc_net_remove("igmp6"); 2675 #endif 2676 } 2677