1 /* 2 * Multicast support for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $ 9 * 10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 18 /* Changes: 19 * 20 * yoshfuji : fix format of router-alert option 21 * YOSHIFUJI Hideaki @USAGI: 22 * Fixed source address for MLD message based on 23 * <draft-ietf-magma-mld-source-05.txt>. 24 * YOSHIFUJI Hideaki @USAGI: 25 * - Ignore Queries for invalid addresses. 26 * - MLD for link-local addresses. 27 * David L Stevens <dlstevens@us.ibm.com>: 28 * - MLDv2 support 29 */ 30 31 #include <linux/module.h> 32 #include <linux/errno.h> 33 #include <linux/types.h> 34 #include <linux/string.h> 35 #include <linux/socket.h> 36 #include <linux/sockios.h> 37 #include <linux/jiffies.h> 38 #include <linux/times.h> 39 #include <linux/net.h> 40 #include <linux/in.h> 41 #include <linux/in6.h> 42 #include <linux/netdevice.h> 43 #include <linux/if_arp.h> 44 #include <linux/route.h> 45 #include <linux/init.h> 46 #include <linux/proc_fs.h> 47 #include <linux/seq_file.h> 48 49 #include <linux/netfilter.h> 50 #include <linux/netfilter_ipv6.h> 51 52 #include <net/sock.h> 53 #include <net/snmp.h> 54 55 #include <net/ipv6.h> 56 #include <net/protocol.h> 57 #include <net/if_inet6.h> 58 #include <net/ndisc.h> 59 #include <net/addrconf.h> 60 #include <net/ip6_route.h> 61 62 #include <net/ip6_checksum.h> 63 64 /* Set to 3 to get tracing... */ 65 #define MCAST_DEBUG 2 66 67 #if MCAST_DEBUG >= 3 68 #define MDBG(x) printk x 69 #else 70 #define MDBG(x) 71 #endif 72 73 /* 74 * These header formats should be in a separate include file, but icmpv6.h 75 * doesn't have in6_addr defined in all cases, there is no __u128, and no 76 * other files reference these. 77 * 78 * +-DLS 4/14/03 79 */ 80 81 /* Multicast Listener Discovery version 2 headers */ 82 83 struct mld2_grec { 84 __u8 grec_type; 85 __u8 grec_auxwords; 86 __u16 grec_nsrcs; 87 struct in6_addr grec_mca; 88 struct in6_addr grec_src[0]; 89 }; 90 91 struct mld2_report { 92 __u8 type; 93 __u8 resv1; 94 __u16 csum; 95 __u16 resv2; 96 __u16 ngrec; 97 struct mld2_grec grec[0]; 98 }; 99 100 struct mld2_query { 101 __u8 type; 102 __u8 code; 103 __u16 csum; 104 __u16 mrc; 105 __u16 resv1; 106 struct in6_addr mca; 107 #if defined(__LITTLE_ENDIAN_BITFIELD) 108 __u8 qrv:3, 109 suppress:1, 110 resv2:4; 111 #elif defined(__BIG_ENDIAN_BITFIELD) 112 __u8 resv2:4, 113 suppress:1, 114 qrv:3; 115 #else 116 #error "Please fix <asm/byteorder.h>" 117 #endif 118 __u8 qqic; 119 __u16 nsrcs; 120 struct in6_addr srcs[0]; 121 }; 122 123 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; 124 125 /* Big mc list lock for all the sockets */ 126 static DEFINE_RWLOCK(ipv6_sk_mc_lock); 127 128 static struct socket *igmp6_socket; 129 130 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr); 131 132 static void igmp6_join_group(struct ifmcaddr6 *ma); 133 static void igmp6_leave_group(struct ifmcaddr6 *ma); 134 static void igmp6_timer_handler(unsigned long data); 135 136 static void mld_gq_timer_expire(unsigned long data); 137 static void mld_ifc_timer_expire(unsigned long data); 138 static void mld_ifc_event(struct inet6_dev *idev); 139 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); 140 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); 141 static void mld_clear_delrec(struct inet6_dev *idev); 142 static int sf_setstate(struct ifmcaddr6 *pmc); 143 static void sf_markstate(struct ifmcaddr6 *pmc); 144 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); 145 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 146 int sfmode, int sfcount, struct in6_addr *psfsrc, 147 int delta); 148 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 149 int sfmode, int sfcount, struct in6_addr *psfsrc, 150 int delta); 151 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 152 struct inet6_dev *idev); 153 154 155 #define IGMP6_UNSOLICITED_IVAL (10*HZ) 156 #define MLD_QRV_DEFAULT 2 157 158 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \ 159 (idev)->cnf.force_mld_version == 1 || \ 160 ((idev)->mc_v1_seen && \ 161 time_before(jiffies, (idev)->mc_v1_seen))) 162 163 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 164 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 165 ((value) < (thresh) ? (value) : \ 166 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \ 167 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 168 169 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) 170 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) 171 172 #define IPV6_MLD_MAX_MSF 64 173 174 int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF; 175 176 /* 177 * socket join on multicast group 178 */ 179 180 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr) 181 { 182 struct net_device *dev = NULL; 183 struct ipv6_mc_socklist *mc_lst; 184 struct ipv6_pinfo *np = inet6_sk(sk); 185 int err; 186 187 if (!ipv6_addr_is_multicast(addr)) 188 return -EINVAL; 189 190 read_lock_bh(&ipv6_sk_mc_lock); 191 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { 192 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 193 ipv6_addr_equal(&mc_lst->addr, addr)) { 194 read_unlock_bh(&ipv6_sk_mc_lock); 195 return -EADDRINUSE; 196 } 197 } 198 read_unlock_bh(&ipv6_sk_mc_lock); 199 200 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); 201 202 if (mc_lst == NULL) 203 return -ENOMEM; 204 205 mc_lst->next = NULL; 206 ipv6_addr_copy(&mc_lst->addr, addr); 207 208 if (ifindex == 0) { 209 struct rt6_info *rt; 210 rt = rt6_lookup(addr, NULL, 0, 0); 211 if (rt) { 212 dev = rt->rt6i_dev; 213 dev_hold(dev); 214 dst_release(&rt->u.dst); 215 } 216 } else 217 dev = dev_get_by_index(ifindex); 218 219 if (dev == NULL) { 220 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 221 return -ENODEV; 222 } 223 224 mc_lst->ifindex = dev->ifindex; 225 mc_lst->sfmode = MCAST_EXCLUDE; 226 rwlock_init(&mc_lst->sflock); 227 mc_lst->sflist = NULL; 228 229 /* 230 * now add/increase the group membership on the device 231 */ 232 233 err = ipv6_dev_mc_inc(dev, addr); 234 235 if (err) { 236 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 237 dev_put(dev); 238 return err; 239 } 240 241 write_lock_bh(&ipv6_sk_mc_lock); 242 mc_lst->next = np->ipv6_mc_list; 243 np->ipv6_mc_list = mc_lst; 244 write_unlock_bh(&ipv6_sk_mc_lock); 245 246 dev_put(dev); 247 248 return 0; 249 } 250 251 /* 252 * socket leave on multicast group 253 */ 254 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr) 255 { 256 struct ipv6_pinfo *np = inet6_sk(sk); 257 struct ipv6_mc_socklist *mc_lst, **lnk; 258 259 write_lock_bh(&ipv6_sk_mc_lock); 260 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { 261 if ((ifindex == 0 || mc_lst->ifindex == ifindex) && 262 ipv6_addr_equal(&mc_lst->addr, addr)) { 263 struct net_device *dev; 264 265 *lnk = mc_lst->next; 266 write_unlock_bh(&ipv6_sk_mc_lock); 267 268 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) { 269 struct inet6_dev *idev = in6_dev_get(dev); 270 271 if (idev) { 272 (void) ip6_mc_leave_src(sk,mc_lst,idev); 273 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 274 in6_dev_put(idev); 275 } 276 dev_put(dev); 277 } 278 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 279 return 0; 280 } 281 } 282 write_unlock_bh(&ipv6_sk_mc_lock); 283 284 return -EADDRNOTAVAIL; 285 } 286 287 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex) 288 { 289 struct net_device *dev = NULL; 290 struct inet6_dev *idev = NULL; 291 292 if (ifindex == 0) { 293 struct rt6_info *rt; 294 295 rt = rt6_lookup(group, NULL, 0, 0); 296 if (rt) { 297 dev = rt->rt6i_dev; 298 dev_hold(dev); 299 dst_release(&rt->u.dst); 300 } 301 } else 302 dev = dev_get_by_index(ifindex); 303 304 if (!dev) 305 return NULL; 306 idev = in6_dev_get(dev); 307 if (!idev) { 308 dev_put(dev); 309 return NULL; 310 } 311 read_lock_bh(&idev->lock); 312 if (idev->dead) { 313 read_unlock_bh(&idev->lock); 314 in6_dev_put(idev); 315 dev_put(dev); 316 return NULL; 317 } 318 return idev; 319 } 320 321 void ipv6_sock_mc_close(struct sock *sk) 322 { 323 struct ipv6_pinfo *np = inet6_sk(sk); 324 struct ipv6_mc_socklist *mc_lst; 325 326 write_lock_bh(&ipv6_sk_mc_lock); 327 while ((mc_lst = np->ipv6_mc_list) != NULL) { 328 struct net_device *dev; 329 330 np->ipv6_mc_list = mc_lst->next; 331 write_unlock_bh(&ipv6_sk_mc_lock); 332 333 dev = dev_get_by_index(mc_lst->ifindex); 334 if (dev) { 335 struct inet6_dev *idev = in6_dev_get(dev); 336 337 if (idev) { 338 (void) ip6_mc_leave_src(sk, mc_lst, idev); 339 __ipv6_dev_mc_dec(idev, &mc_lst->addr); 340 in6_dev_put(idev); 341 } 342 dev_put(dev); 343 } 344 345 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); 346 347 write_lock_bh(&ipv6_sk_mc_lock); 348 } 349 write_unlock_bh(&ipv6_sk_mc_lock); 350 } 351 352 int ip6_mc_source(int add, int omode, struct sock *sk, 353 struct group_source_req *pgsr) 354 { 355 struct in6_addr *source, *group; 356 struct ipv6_mc_socklist *pmc; 357 struct net_device *dev; 358 struct inet6_dev *idev; 359 struct ipv6_pinfo *inet6 = inet6_sk(sk); 360 struct ip6_sf_socklist *psl; 361 int i, j, rv; 362 int leavegroup = 0; 363 int pmclocked = 0; 364 int err; 365 366 if (pgsr->gsr_group.ss_family != AF_INET6 || 367 pgsr->gsr_source.ss_family != AF_INET6) 368 return -EINVAL; 369 370 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 371 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 372 373 if (!ipv6_addr_is_multicast(group)) 374 return -EINVAL; 375 376 idev = ip6_mc_find_dev(group, pgsr->gsr_interface); 377 if (!idev) 378 return -ENODEV; 379 dev = idev->dev; 380 381 err = -EADDRNOTAVAIL; 382 383 read_lock_bh(&ipv6_sk_mc_lock); 384 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 385 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 386 continue; 387 if (ipv6_addr_equal(&pmc->addr, group)) 388 break; 389 } 390 if (!pmc) { /* must have a prior join */ 391 err = -EINVAL; 392 goto done; 393 } 394 /* if a source filter was set, must be the same mode as before */ 395 if (pmc->sflist) { 396 if (pmc->sfmode != omode) { 397 err = -EINVAL; 398 goto done; 399 } 400 } else if (pmc->sfmode != omode) { 401 /* allow mode switches for empty-set filters */ 402 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 403 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 404 pmc->sfmode = omode; 405 } 406 407 write_lock_bh(&pmc->sflock); 408 pmclocked = 1; 409 410 psl = pmc->sflist; 411 if (!add) { 412 if (!psl) 413 goto done; /* err = -EADDRNOTAVAIL */ 414 rv = !0; 415 for (i=0; i<psl->sl_count; i++) { 416 rv = memcmp(&psl->sl_addr[i], source, 417 sizeof(struct in6_addr)); 418 if (rv == 0) 419 break; 420 } 421 if (rv) /* source not found */ 422 goto done; /* err = -EADDRNOTAVAIL */ 423 424 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 425 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 426 leavegroup = 1; 427 goto done; 428 } 429 430 /* update the interface filter */ 431 ip6_mc_del_src(idev, group, omode, 1, source, 1); 432 433 for (j=i+1; j<psl->sl_count; j++) 434 psl->sl_addr[j-1] = psl->sl_addr[j]; 435 psl->sl_count--; 436 err = 0; 437 goto done; 438 } 439 /* else, add a new source to the filter */ 440 441 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 442 err = -ENOBUFS; 443 goto done; 444 } 445 if (!psl || psl->sl_count == psl->sl_max) { 446 struct ip6_sf_socklist *newpsl; 447 int count = IP6_SFBLOCK; 448 449 if (psl) 450 count += psl->sl_max; 451 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); 452 if (!newpsl) { 453 err = -ENOBUFS; 454 goto done; 455 } 456 newpsl->sl_max = count; 457 newpsl->sl_count = count - IP6_SFBLOCK; 458 if (psl) { 459 for (i=0; i<psl->sl_count; i++) 460 newpsl->sl_addr[i] = psl->sl_addr[i]; 461 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 462 } 463 pmc->sflist = psl = newpsl; 464 } 465 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 466 for (i=0; i<psl->sl_count; i++) { 467 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 468 if (rv == 0) 469 break; 470 } 471 if (rv == 0) /* address already there is an error */ 472 goto done; 473 for (j=psl->sl_count-1; j>=i; j--) 474 psl->sl_addr[j+1] = psl->sl_addr[j]; 475 psl->sl_addr[i] = *source; 476 psl->sl_count++; 477 err = 0; 478 /* update the interface list */ 479 ip6_mc_add_src(idev, group, omode, 1, source, 1); 480 done: 481 if (pmclocked) 482 write_unlock_bh(&pmc->sflock); 483 read_unlock_bh(&ipv6_sk_mc_lock); 484 read_unlock_bh(&idev->lock); 485 in6_dev_put(idev); 486 dev_put(dev); 487 if (leavegroup) 488 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 489 return err; 490 } 491 492 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 493 { 494 struct in6_addr *group; 495 struct ipv6_mc_socklist *pmc; 496 struct net_device *dev; 497 struct inet6_dev *idev; 498 struct ipv6_pinfo *inet6 = inet6_sk(sk); 499 struct ip6_sf_socklist *newpsl, *psl; 500 int leavegroup = 0; 501 int i, err; 502 503 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 504 505 if (!ipv6_addr_is_multicast(group)) 506 return -EINVAL; 507 if (gsf->gf_fmode != MCAST_INCLUDE && 508 gsf->gf_fmode != MCAST_EXCLUDE) 509 return -EINVAL; 510 511 idev = ip6_mc_find_dev(group, gsf->gf_interface); 512 513 if (!idev) 514 return -ENODEV; 515 dev = idev->dev; 516 517 err = 0; 518 read_lock_bh(&ipv6_sk_mc_lock); 519 520 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 521 leavegroup = 1; 522 goto done; 523 } 524 525 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 526 if (pmc->ifindex != gsf->gf_interface) 527 continue; 528 if (ipv6_addr_equal(&pmc->addr, group)) 529 break; 530 } 531 if (!pmc) { /* must have a prior join */ 532 err = -EINVAL; 533 goto done; 534 } 535 if (gsf->gf_numsrc) { 536 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), 537 GFP_ATOMIC); 538 if (!newpsl) { 539 err = -ENOBUFS; 540 goto done; 541 } 542 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 543 for (i=0; i<newpsl->sl_count; ++i) { 544 struct sockaddr_in6 *psin6; 545 546 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 547 newpsl->sl_addr[i] = psin6->sin6_addr; 548 } 549 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 550 newpsl->sl_count, newpsl->sl_addr, 0); 551 if (err) { 552 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 553 goto done; 554 } 555 } else { 556 newpsl = NULL; 557 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 558 } 559 560 write_lock_bh(&pmc->sflock); 561 psl = pmc->sflist; 562 if (psl) { 563 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 564 psl->sl_count, psl->sl_addr, 0); 565 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 566 } else 567 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 568 pmc->sflist = newpsl; 569 pmc->sfmode = gsf->gf_fmode; 570 write_unlock_bh(&pmc->sflock); 571 err = 0; 572 done: 573 read_unlock_bh(&ipv6_sk_mc_lock); 574 read_unlock_bh(&idev->lock); 575 in6_dev_put(idev); 576 dev_put(dev); 577 if (leavegroup) 578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 579 return err; 580 } 581 582 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 583 struct group_filter __user *optval, int __user *optlen) 584 { 585 int err, i, count, copycount; 586 struct in6_addr *group; 587 struct ipv6_mc_socklist *pmc; 588 struct inet6_dev *idev; 589 struct net_device *dev; 590 struct ipv6_pinfo *inet6 = inet6_sk(sk); 591 struct ip6_sf_socklist *psl; 592 593 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 594 595 if (!ipv6_addr_is_multicast(group)) 596 return -EINVAL; 597 598 idev = ip6_mc_find_dev(group, gsf->gf_interface); 599 600 if (!idev) 601 return -ENODEV; 602 603 dev = idev->dev; 604 605 err = -EADDRNOTAVAIL; 606 /* 607 * changes to the ipv6_mc_list require the socket lock and 608 * a read lock on ip6_sk_mc_lock. We have the socket lock, 609 * so reading the list is safe. 610 */ 611 612 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 613 if (pmc->ifindex != gsf->gf_interface) 614 continue; 615 if (ipv6_addr_equal(group, &pmc->addr)) 616 break; 617 } 618 if (!pmc) /* must have a prior join */ 619 goto done; 620 gsf->gf_fmode = pmc->sfmode; 621 psl = pmc->sflist; 622 count = psl ? psl->sl_count : 0; 623 read_unlock_bh(&idev->lock); 624 in6_dev_put(idev); 625 dev_put(dev); 626 627 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 628 gsf->gf_numsrc = count; 629 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 630 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 631 return -EFAULT; 632 } 633 /* changes to psl require the socket lock, a read lock on 634 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We 635 * have the socket lock, so reading here is safe. 636 */ 637 for (i=0; i<copycount; i++) { 638 struct sockaddr_in6 *psin6; 639 struct sockaddr_storage ss; 640 641 psin6 = (struct sockaddr_in6 *)&ss; 642 memset(&ss, 0, sizeof(ss)); 643 psin6->sin6_family = AF_INET6; 644 psin6->sin6_addr = psl->sl_addr[i]; 645 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 646 return -EFAULT; 647 } 648 return 0; 649 done: 650 read_unlock_bh(&idev->lock); 651 in6_dev_put(idev); 652 dev_put(dev); 653 return err; 654 } 655 656 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr, 657 struct in6_addr *src_addr) 658 { 659 struct ipv6_pinfo *np = inet6_sk(sk); 660 struct ipv6_mc_socklist *mc; 661 struct ip6_sf_socklist *psl; 662 int rv = 1; 663 664 read_lock(&ipv6_sk_mc_lock); 665 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 666 if (ipv6_addr_equal(&mc->addr, mc_addr)) 667 break; 668 } 669 if (!mc) { 670 read_unlock(&ipv6_sk_mc_lock); 671 return 1; 672 } 673 read_lock(&mc->sflock); 674 psl = mc->sflist; 675 if (!psl) { 676 rv = mc->sfmode == MCAST_EXCLUDE; 677 } else { 678 int i; 679 680 for (i=0; i<psl->sl_count; i++) { 681 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 682 break; 683 } 684 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 685 rv = 0; 686 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 687 rv = 0; 688 } 689 read_unlock(&mc->sflock); 690 read_unlock(&ipv6_sk_mc_lock); 691 692 return rv; 693 } 694 695 static void ma_put(struct ifmcaddr6 *mc) 696 { 697 if (atomic_dec_and_test(&mc->mca_refcnt)) { 698 in6_dev_put(mc->idev); 699 kfree(mc); 700 } 701 } 702 703 static void igmp6_group_added(struct ifmcaddr6 *mc) 704 { 705 struct net_device *dev = mc->idev->dev; 706 char buf[MAX_ADDR_LEN]; 707 708 spin_lock_bh(&mc->mca_lock); 709 if (!(mc->mca_flags&MAF_LOADED)) { 710 mc->mca_flags |= MAF_LOADED; 711 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 712 dev_mc_add(dev, buf, dev->addr_len, 0); 713 } 714 spin_unlock_bh(&mc->mca_lock); 715 716 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 717 return; 718 719 if (MLD_V1_SEEN(mc->idev)) { 720 igmp6_join_group(mc); 721 return; 722 } 723 /* else v2 */ 724 725 mc->mca_crcount = mc->idev->mc_qrv; 726 mld_ifc_event(mc->idev); 727 } 728 729 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 730 { 731 struct net_device *dev = mc->idev->dev; 732 char buf[MAX_ADDR_LEN]; 733 734 spin_lock_bh(&mc->mca_lock); 735 if (mc->mca_flags&MAF_LOADED) { 736 mc->mca_flags &= ~MAF_LOADED; 737 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 738 dev_mc_delete(dev, buf, dev->addr_len, 0); 739 } 740 741 if (mc->mca_flags & MAF_NOREPORT) 742 goto done; 743 spin_unlock_bh(&mc->mca_lock); 744 745 if (!mc->idev->dead) 746 igmp6_leave_group(mc); 747 748 spin_lock_bh(&mc->mca_lock); 749 if (del_timer(&mc->mca_timer)) 750 atomic_dec(&mc->mca_refcnt); 751 done: 752 ip6_mc_clear_src(mc); 753 spin_unlock_bh(&mc->mca_lock); 754 } 755 756 /* 757 * deleted ifmcaddr6 manipulation 758 */ 759 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 760 { 761 struct ifmcaddr6 *pmc; 762 763 /* this is an "ifmcaddr6" for convenience; only the fields below 764 * are actually used. In particular, the refcnt and users are not 765 * used for management of the delete list. Using the same structure 766 * for deleted items allows change reports to use common code with 767 * non-deleted or query-response MCA's. 768 */ 769 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); 770 if (!pmc) 771 return; 772 773 spin_lock_bh(&im->mca_lock); 774 spin_lock_init(&pmc->mca_lock); 775 pmc->idev = im->idev; 776 in6_dev_hold(idev); 777 pmc->mca_addr = im->mca_addr; 778 pmc->mca_crcount = idev->mc_qrv; 779 pmc->mca_sfmode = im->mca_sfmode; 780 if (pmc->mca_sfmode == MCAST_INCLUDE) { 781 struct ip6_sf_list *psf; 782 783 pmc->mca_tomb = im->mca_tomb; 784 pmc->mca_sources = im->mca_sources; 785 im->mca_tomb = im->mca_sources = NULL; 786 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 787 psf->sf_crcount = pmc->mca_crcount; 788 } 789 spin_unlock_bh(&im->mca_lock); 790 791 write_lock_bh(&idev->mc_lock); 792 pmc->next = idev->mc_tomb; 793 idev->mc_tomb = pmc; 794 write_unlock_bh(&idev->mc_lock); 795 } 796 797 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 798 { 799 struct ifmcaddr6 *pmc, *pmc_prev; 800 struct ip6_sf_list *psf, *psf_next; 801 802 write_lock_bh(&idev->mc_lock); 803 pmc_prev = NULL; 804 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 805 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 806 break; 807 pmc_prev = pmc; 808 } 809 if (pmc) { 810 if (pmc_prev) 811 pmc_prev->next = pmc->next; 812 else 813 idev->mc_tomb = pmc->next; 814 } 815 write_unlock_bh(&idev->mc_lock); 816 if (pmc) { 817 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 818 psf_next = psf->sf_next; 819 kfree(psf); 820 } 821 in6_dev_put(pmc->idev); 822 kfree(pmc); 823 } 824 } 825 826 static void mld_clear_delrec(struct inet6_dev *idev) 827 { 828 struct ifmcaddr6 *pmc, *nextpmc; 829 830 write_lock_bh(&idev->mc_lock); 831 pmc = idev->mc_tomb; 832 idev->mc_tomb = NULL; 833 write_unlock_bh(&idev->mc_lock); 834 835 for (; pmc; pmc = nextpmc) { 836 nextpmc = pmc->next; 837 ip6_mc_clear_src(pmc); 838 in6_dev_put(pmc->idev); 839 kfree(pmc); 840 } 841 842 /* clear dead sources, too */ 843 read_lock_bh(&idev->lock); 844 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 845 struct ip6_sf_list *psf, *psf_next; 846 847 spin_lock_bh(&pmc->mca_lock); 848 psf = pmc->mca_tomb; 849 pmc->mca_tomb = NULL; 850 spin_unlock_bh(&pmc->mca_lock); 851 for (; psf; psf=psf_next) { 852 psf_next = psf->sf_next; 853 kfree(psf); 854 } 855 } 856 read_unlock_bh(&idev->lock); 857 } 858 859 860 /* 861 * device multicast group inc (add if not found) 862 */ 863 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr) 864 { 865 struct ifmcaddr6 *mc; 866 struct inet6_dev *idev; 867 868 idev = in6_dev_get(dev); 869 870 if (idev == NULL) 871 return -EINVAL; 872 873 write_lock_bh(&idev->lock); 874 if (idev->dead) { 875 write_unlock_bh(&idev->lock); 876 in6_dev_put(idev); 877 return -ENODEV; 878 } 879 880 for (mc = idev->mc_list; mc; mc = mc->next) { 881 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 882 mc->mca_users++; 883 write_unlock_bh(&idev->lock); 884 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 885 NULL, 0); 886 in6_dev_put(idev); 887 return 0; 888 } 889 } 890 891 /* 892 * not found: create a new one. 893 */ 894 895 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 896 897 if (mc == NULL) { 898 write_unlock_bh(&idev->lock); 899 in6_dev_put(idev); 900 return -ENOMEM; 901 } 902 903 init_timer(&mc->mca_timer); 904 mc->mca_timer.function = igmp6_timer_handler; 905 mc->mca_timer.data = (unsigned long) mc; 906 907 ipv6_addr_copy(&mc->mca_addr, addr); 908 mc->idev = idev; 909 mc->mca_users = 1; 910 /* mca_stamp should be updated upon changes */ 911 mc->mca_cstamp = mc->mca_tstamp = jiffies; 912 atomic_set(&mc->mca_refcnt, 2); 913 spin_lock_init(&mc->mca_lock); 914 915 /* initial mode is (EX, empty) */ 916 mc->mca_sfmode = MCAST_EXCLUDE; 917 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 918 919 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 920 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 921 mc->mca_flags |= MAF_NOREPORT; 922 923 mc->next = idev->mc_list; 924 idev->mc_list = mc; 925 write_unlock_bh(&idev->lock); 926 927 mld_del_delrec(idev, &mc->mca_addr); 928 igmp6_group_added(mc); 929 ma_put(mc); 930 return 0; 931 } 932 933 /* 934 * device multicast group del 935 */ 936 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) 937 { 938 struct ifmcaddr6 *ma, **map; 939 940 write_lock_bh(&idev->lock); 941 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 942 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 943 if (--ma->mca_users == 0) { 944 *map = ma->next; 945 write_unlock_bh(&idev->lock); 946 947 igmp6_group_dropped(ma); 948 949 ma_put(ma); 950 return 0; 951 } 952 write_unlock_bh(&idev->lock); 953 return 0; 954 } 955 } 956 write_unlock_bh(&idev->lock); 957 958 return -ENOENT; 959 } 960 961 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) 962 { 963 struct inet6_dev *idev = in6_dev_get(dev); 964 int err; 965 966 if (!idev) 967 return -ENODEV; 968 969 err = __ipv6_dev_mc_dec(idev, addr); 970 971 in6_dev_put(idev); 972 973 return err; 974 } 975 976 /* 977 * identify MLD packets for MLD filter exceptions 978 */ 979 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 980 { 981 struct icmp6hdr *pic; 982 983 if (nexthdr != IPPROTO_ICMPV6) 984 return 0; 985 986 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 987 return 0; 988 989 pic = (struct icmp6hdr *)skb->h.raw; 990 991 switch (pic->icmp6_type) { 992 case ICMPV6_MGM_QUERY: 993 case ICMPV6_MGM_REPORT: 994 case ICMPV6_MGM_REDUCTION: 995 case ICMPV6_MLD2_REPORT: 996 return 1; 997 default: 998 break; 999 } 1000 return 0; 1001 } 1002 1003 /* 1004 * check if the interface/address pair is valid 1005 */ 1006 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, 1007 struct in6_addr *src_addr) 1008 { 1009 struct inet6_dev *idev; 1010 struct ifmcaddr6 *mc; 1011 int rv = 0; 1012 1013 idev = in6_dev_get(dev); 1014 if (idev) { 1015 read_lock_bh(&idev->lock); 1016 for (mc = idev->mc_list; mc; mc=mc->next) { 1017 if (ipv6_addr_equal(&mc->mca_addr, group)) 1018 break; 1019 } 1020 if (mc) { 1021 if (src_addr && !ipv6_addr_any(src_addr)) { 1022 struct ip6_sf_list *psf; 1023 1024 spin_lock_bh(&mc->mca_lock); 1025 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1026 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1027 break; 1028 } 1029 if (psf) 1030 rv = psf->sf_count[MCAST_INCLUDE] || 1031 psf->sf_count[MCAST_EXCLUDE] != 1032 mc->mca_sfcount[MCAST_EXCLUDE]; 1033 else 1034 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1035 spin_unlock_bh(&mc->mca_lock); 1036 } else 1037 rv = 1; /* don't filter unspecified source */ 1038 } 1039 read_unlock_bh(&idev->lock); 1040 in6_dev_put(idev); 1041 } 1042 return rv; 1043 } 1044 1045 static void mld_gq_start_timer(struct inet6_dev *idev) 1046 { 1047 int tv = net_random() % idev->mc_maxdelay; 1048 1049 idev->mc_gq_running = 1; 1050 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1051 in6_dev_hold(idev); 1052 } 1053 1054 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1055 { 1056 int tv = net_random() % delay; 1057 1058 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1059 in6_dev_hold(idev); 1060 } 1061 1062 /* 1063 * IGMP handling (alias multicast ICMPv6 messages) 1064 */ 1065 1066 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1067 { 1068 unsigned long delay = resptime; 1069 1070 /* Do not start timer for these addresses */ 1071 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1072 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1073 return; 1074 1075 if (del_timer(&ma->mca_timer)) { 1076 atomic_dec(&ma->mca_refcnt); 1077 delay = ma->mca_timer.expires - jiffies; 1078 } 1079 1080 if (delay >= resptime) { 1081 if (resptime) 1082 delay = net_random() % resptime; 1083 else 1084 delay = 1; 1085 } 1086 ma->mca_timer.expires = jiffies + delay; 1087 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1088 atomic_inc(&ma->mca_refcnt); 1089 ma->mca_flags |= MAF_TIMER_RUNNING; 1090 } 1091 1092 /* mark EXCLUDE-mode sources */ 1093 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, 1094 struct in6_addr *srcs) 1095 { 1096 struct ip6_sf_list *psf; 1097 int i, scount; 1098 1099 scount = 0; 1100 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1101 if (scount == nsrcs) 1102 break; 1103 for (i=0; i<nsrcs; i++) { 1104 /* skip inactive filters */ 1105 if (pmc->mca_sfcount[MCAST_INCLUDE] || 1106 pmc->mca_sfcount[MCAST_EXCLUDE] != 1107 psf->sf_count[MCAST_EXCLUDE]) 1108 continue; 1109 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1110 scount++; 1111 break; 1112 } 1113 } 1114 } 1115 pmc->mca_flags &= ~MAF_GSQUERY; 1116 if (scount == nsrcs) /* all sources excluded */ 1117 return 0; 1118 return 1; 1119 } 1120 1121 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1122 struct in6_addr *srcs) 1123 { 1124 struct ip6_sf_list *psf; 1125 int i, scount; 1126 1127 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1128 return mld_xmarksources(pmc, nsrcs, srcs); 1129 1130 /* mark INCLUDE-mode sources */ 1131 1132 scount = 0; 1133 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1134 if (scount == nsrcs) 1135 break; 1136 for (i=0; i<nsrcs; i++) { 1137 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1138 psf->sf_gsresp = 1; 1139 scount++; 1140 break; 1141 } 1142 } 1143 } 1144 if (!scount) { 1145 pmc->mca_flags &= ~MAF_GSQUERY; 1146 return 0; 1147 } 1148 pmc->mca_flags |= MAF_GSQUERY; 1149 return 1; 1150 } 1151 1152 int igmp6_event_query(struct sk_buff *skb) 1153 { 1154 struct mld2_query *mlh2 = NULL; 1155 struct ifmcaddr6 *ma; 1156 struct in6_addr *group; 1157 unsigned long max_delay; 1158 struct inet6_dev *idev; 1159 struct icmp6hdr *hdr; 1160 int group_type; 1161 int mark = 0; 1162 int len; 1163 1164 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1165 return -EINVAL; 1166 1167 /* compute payload length excluding extension headers */ 1168 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); 1169 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; 1170 1171 /* Drop queries with not link local source */ 1172 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL)) 1173 return -EINVAL; 1174 1175 idev = in6_dev_get(skb->dev); 1176 1177 if (idev == NULL) 1178 return 0; 1179 1180 hdr = (struct icmp6hdr *) skb->h.raw; 1181 group = (struct in6_addr *) (hdr + 1); 1182 group_type = ipv6_addr_type(group); 1183 1184 if (group_type != IPV6_ADDR_ANY && 1185 !(group_type&IPV6_ADDR_MULTICAST)) { 1186 in6_dev_put(idev); 1187 return -EINVAL; 1188 } 1189 1190 if (len == 24) { 1191 int switchback; 1192 /* MLDv1 router present */ 1193 1194 /* Translate milliseconds to jiffies */ 1195 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1196 1197 switchback = (idev->mc_qrv + 1) * max_delay; 1198 idev->mc_v1_seen = jiffies + switchback; 1199 1200 /* cancel the interface change timer */ 1201 idev->mc_ifc_count = 0; 1202 if (del_timer(&idev->mc_ifc_timer)) 1203 __in6_dev_put(idev); 1204 /* clear deleted report items */ 1205 mld_clear_delrec(idev); 1206 } else if (len >= 28) { 1207 int srcs_offset = sizeof(struct mld2_query) - 1208 sizeof(struct icmp6hdr); 1209 if (!pskb_may_pull(skb, srcs_offset)) { 1210 in6_dev_put(idev); 1211 return -EINVAL; 1212 } 1213 mlh2 = (struct mld2_query *) skb->h.raw; 1214 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1215 if (!max_delay) 1216 max_delay = 1; 1217 idev->mc_maxdelay = max_delay; 1218 if (mlh2->qrv) 1219 idev->mc_qrv = mlh2->qrv; 1220 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1221 if (mlh2->nsrcs) { 1222 in6_dev_put(idev); 1223 return -EINVAL; /* no sources allowed */ 1224 } 1225 mld_gq_start_timer(idev); 1226 in6_dev_put(idev); 1227 return 0; 1228 } 1229 /* mark sources to include, if group & source-specific */ 1230 if (mlh2->nsrcs != 0) { 1231 if (!pskb_may_pull(skb, srcs_offset + 1232 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { 1233 in6_dev_put(idev); 1234 return -EINVAL; 1235 } 1236 mlh2 = (struct mld2_query *) skb->h.raw; 1237 mark = 1; 1238 } 1239 } else { 1240 in6_dev_put(idev); 1241 return -EINVAL; 1242 } 1243 1244 read_lock_bh(&idev->lock); 1245 if (group_type == IPV6_ADDR_ANY) { 1246 for (ma = idev->mc_list; ma; ma=ma->next) { 1247 spin_lock_bh(&ma->mca_lock); 1248 igmp6_group_queried(ma, max_delay); 1249 spin_unlock_bh(&ma->mca_lock); 1250 } 1251 } else { 1252 for (ma = idev->mc_list; ma; ma=ma->next) { 1253 if (!ipv6_addr_equal(group, &ma->mca_addr)) 1254 continue; 1255 spin_lock_bh(&ma->mca_lock); 1256 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1257 /* gsquery <- gsquery && mark */ 1258 if (!mark) 1259 ma->mca_flags &= ~MAF_GSQUERY; 1260 } else { 1261 /* gsquery <- mark */ 1262 if (mark) 1263 ma->mca_flags |= MAF_GSQUERY; 1264 else 1265 ma->mca_flags &= ~MAF_GSQUERY; 1266 } 1267 if (!(ma->mca_flags & MAF_GSQUERY) || 1268 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs)) 1269 igmp6_group_queried(ma, max_delay); 1270 spin_unlock_bh(&ma->mca_lock); 1271 break; 1272 } 1273 } 1274 read_unlock_bh(&idev->lock); 1275 in6_dev_put(idev); 1276 1277 return 0; 1278 } 1279 1280 1281 int igmp6_event_report(struct sk_buff *skb) 1282 { 1283 struct ifmcaddr6 *ma; 1284 struct in6_addr *addrp; 1285 struct inet6_dev *idev; 1286 struct icmp6hdr *hdr; 1287 int addr_type; 1288 1289 /* Our own report looped back. Ignore it. */ 1290 if (skb->pkt_type == PACKET_LOOPBACK) 1291 return 0; 1292 1293 /* send our report if the MC router may not have heard this report */ 1294 if (skb->pkt_type != PACKET_MULTICAST && 1295 skb->pkt_type != PACKET_BROADCAST) 1296 return 0; 1297 1298 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1299 return -EINVAL; 1300 1301 hdr = (struct icmp6hdr*) skb->h.raw; 1302 1303 /* Drop reports with not link local source */ 1304 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); 1305 if (addr_type != IPV6_ADDR_ANY && 1306 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1307 return -EINVAL; 1308 1309 addrp = (struct in6_addr *) (hdr + 1); 1310 1311 idev = in6_dev_get(skb->dev); 1312 if (idev == NULL) 1313 return -ENODEV; 1314 1315 /* 1316 * Cancel the timer for this group 1317 */ 1318 1319 read_lock_bh(&idev->lock); 1320 for (ma = idev->mc_list; ma; ma=ma->next) { 1321 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1322 spin_lock(&ma->mca_lock); 1323 if (del_timer(&ma->mca_timer)) 1324 atomic_dec(&ma->mca_refcnt); 1325 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1326 spin_unlock(&ma->mca_lock); 1327 break; 1328 } 1329 } 1330 read_unlock_bh(&idev->lock); 1331 in6_dev_put(idev); 1332 return 0; 1333 } 1334 1335 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1336 int gdeleted, int sdeleted) 1337 { 1338 switch (type) { 1339 case MLD2_MODE_IS_INCLUDE: 1340 case MLD2_MODE_IS_EXCLUDE: 1341 if (gdeleted || sdeleted) 1342 return 0; 1343 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { 1344 if (pmc->mca_sfmode == MCAST_INCLUDE) 1345 return 1; 1346 /* don't include if this source is excluded 1347 * in all filters 1348 */ 1349 if (psf->sf_count[MCAST_INCLUDE]) 1350 return type == MLD2_MODE_IS_INCLUDE; 1351 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1352 psf->sf_count[MCAST_EXCLUDE]; 1353 } 1354 return 0; 1355 case MLD2_CHANGE_TO_INCLUDE: 1356 if (gdeleted || sdeleted) 1357 return 0; 1358 return psf->sf_count[MCAST_INCLUDE] != 0; 1359 case MLD2_CHANGE_TO_EXCLUDE: 1360 if (gdeleted || sdeleted) 1361 return 0; 1362 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1363 psf->sf_count[MCAST_INCLUDE]) 1364 return 0; 1365 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1366 psf->sf_count[MCAST_EXCLUDE]; 1367 case MLD2_ALLOW_NEW_SOURCES: 1368 if (gdeleted || !psf->sf_crcount) 1369 return 0; 1370 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1371 case MLD2_BLOCK_OLD_SOURCES: 1372 if (pmc->mca_sfmode == MCAST_INCLUDE) 1373 return gdeleted || (psf->sf_crcount && sdeleted); 1374 return psf->sf_crcount && !gdeleted && !sdeleted; 1375 } 1376 return 0; 1377 } 1378 1379 static int 1380 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1381 { 1382 struct ip6_sf_list *psf; 1383 int scount = 0; 1384 1385 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1386 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1387 continue; 1388 scount++; 1389 } 1390 return scount; 1391 } 1392 1393 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1394 { 1395 struct sock *sk = igmp6_socket->sk; 1396 struct sk_buff *skb; 1397 struct mld2_report *pmr; 1398 struct in6_addr addr_buf; 1399 int err; 1400 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1401 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1402 IPV6_TLV_PADN, 0 }; 1403 1404 /* we assume size > sizeof(ra) here */ 1405 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1406 1407 if (skb == 0) 1408 return NULL; 1409 1410 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1411 1412 if (ipv6_get_lladdr(dev, &addr_buf)) { 1413 /* <draft-ietf-magma-mld-source-05.txt>: 1414 * use unspecified address as the source address 1415 * when a valid link-local address is not available. 1416 */ 1417 memset(&addr_buf, 0, sizeof(addr_buf)); 1418 } 1419 1420 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1421 1422 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1423 1424 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); 1425 skb->h.raw = (unsigned char *)pmr; 1426 pmr->type = ICMPV6_MLD2_REPORT; 1427 pmr->resv1 = 0; 1428 pmr->csum = 0; 1429 pmr->resv2 = 0; 1430 pmr->ngrec = 0; 1431 return skb; 1432 } 1433 1434 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1435 { 1436 struct net_device *dev = skb->dev; 1437 1438 if (dev->hard_header) { 1439 unsigned char ha[MAX_ADDR_LEN]; 1440 int err; 1441 1442 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1); 1443 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); 1444 if (err < 0) { 1445 kfree_skb(skb); 1446 return err; 1447 } 1448 } 1449 return dev_queue_xmit(skb); 1450 } 1451 1452 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1453 { 1454 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1455 mld_dev_queue_xmit2); 1456 } 1457 1458 static void mld_sendpack(struct sk_buff *skb) 1459 { 1460 struct ipv6hdr *pip6 = skb->nh.ipv6h; 1461 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; 1462 int payload_len, mldlen; 1463 struct inet6_dev *idev = in6_dev_get(skb->dev); 1464 int err; 1465 1466 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1467 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - 1468 sizeof(struct ipv6hdr); 1469 mldlen = skb->tail - skb->h.raw; 1470 pip6->payload_len = htons(payload_len); 1471 1472 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1473 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); 1474 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1475 mld_dev_queue_xmit); 1476 if (!err) { 1477 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); 1478 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1479 } else 1480 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1481 1482 if (likely(idev != NULL)) 1483 in6_dev_put(idev); 1484 } 1485 1486 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1487 { 1488 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1489 } 1490 1491 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1492 int type, struct mld2_grec **ppgr) 1493 { 1494 struct net_device *dev = pmc->idev->dev; 1495 struct mld2_report *pmr; 1496 struct mld2_grec *pgr; 1497 1498 if (!skb) 1499 skb = mld_newpack(dev, dev->mtu); 1500 if (!skb) 1501 return NULL; 1502 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1503 pgr->grec_type = type; 1504 pgr->grec_auxwords = 0; 1505 pgr->grec_nsrcs = 0; 1506 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1507 pmr = (struct mld2_report *)skb->h.raw; 1508 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1509 *ppgr = pgr; 1510 return skb; 1511 } 1512 1513 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1514 skb_tailroom(skb)) : 0) 1515 1516 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1517 int type, int gdeleted, int sdeleted) 1518 { 1519 struct net_device *dev = pmc->idev->dev; 1520 struct mld2_report *pmr; 1521 struct mld2_grec *pgr = NULL; 1522 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1523 int scount, stotal, first, isquery, truncate; 1524 1525 if (pmc->mca_flags & MAF_NOREPORT) 1526 return skb; 1527 1528 isquery = type == MLD2_MODE_IS_INCLUDE || 1529 type == MLD2_MODE_IS_EXCLUDE; 1530 truncate = type == MLD2_MODE_IS_EXCLUDE || 1531 type == MLD2_CHANGE_TO_EXCLUDE; 1532 1533 stotal = scount = 0; 1534 1535 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1536 1537 if (!*psf_list) 1538 goto empty_source; 1539 1540 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; 1541 1542 /* EX and TO_EX get a fresh packet, if needed */ 1543 if (truncate) { 1544 if (pmr && pmr->ngrec && 1545 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1546 if (skb) 1547 mld_sendpack(skb); 1548 skb = mld_newpack(dev, dev->mtu); 1549 } 1550 } 1551 first = 1; 1552 psf_prev = NULL; 1553 for (psf=*psf_list; psf; psf=psf_next) { 1554 struct in6_addr *psrc; 1555 1556 psf_next = psf->sf_next; 1557 1558 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1559 psf_prev = psf; 1560 continue; 1561 } 1562 1563 /* clear marks on query responses */ 1564 if (isquery) 1565 psf->sf_gsresp = 0; 1566 1567 if (AVAILABLE(skb) < sizeof(*psrc) + 1568 first*sizeof(struct mld2_grec)) { 1569 if (truncate && !first) 1570 break; /* truncate these */ 1571 if (pgr) 1572 pgr->grec_nsrcs = htons(scount); 1573 if (skb) 1574 mld_sendpack(skb); 1575 skb = mld_newpack(dev, dev->mtu); 1576 first = 1; 1577 scount = 0; 1578 } 1579 if (first) { 1580 skb = add_grhead(skb, pmc, type, &pgr); 1581 first = 0; 1582 } 1583 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1584 *psrc = psf->sf_addr; 1585 scount++; stotal++; 1586 if ((type == MLD2_ALLOW_NEW_SOURCES || 1587 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1588 psf->sf_crcount--; 1589 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1590 if (psf_prev) 1591 psf_prev->sf_next = psf->sf_next; 1592 else 1593 *psf_list = psf->sf_next; 1594 kfree(psf); 1595 continue; 1596 } 1597 } 1598 psf_prev = psf; 1599 } 1600 1601 empty_source: 1602 if (!stotal) { 1603 if (type == MLD2_ALLOW_NEW_SOURCES || 1604 type == MLD2_BLOCK_OLD_SOURCES) 1605 return skb; 1606 if (pmc->mca_crcount || isquery) { 1607 /* make sure we have room for group header */ 1608 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { 1609 mld_sendpack(skb); 1610 skb = NULL; /* add_grhead will get a new one */ 1611 } 1612 skb = add_grhead(skb, pmc, type, &pgr); 1613 } 1614 } 1615 if (pgr) 1616 pgr->grec_nsrcs = htons(scount); 1617 1618 if (isquery) 1619 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1620 return skb; 1621 } 1622 1623 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1624 { 1625 struct sk_buff *skb = NULL; 1626 int type; 1627 1628 if (!pmc) { 1629 read_lock_bh(&idev->lock); 1630 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1631 if (pmc->mca_flags & MAF_NOREPORT) 1632 continue; 1633 spin_lock_bh(&pmc->mca_lock); 1634 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1635 type = MLD2_MODE_IS_EXCLUDE; 1636 else 1637 type = MLD2_MODE_IS_INCLUDE; 1638 skb = add_grec(skb, pmc, type, 0, 0); 1639 spin_unlock_bh(&pmc->mca_lock); 1640 } 1641 read_unlock_bh(&idev->lock); 1642 } else { 1643 spin_lock_bh(&pmc->mca_lock); 1644 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1645 type = MLD2_MODE_IS_EXCLUDE; 1646 else 1647 type = MLD2_MODE_IS_INCLUDE; 1648 skb = add_grec(skb, pmc, type, 0, 0); 1649 spin_unlock_bh(&pmc->mca_lock); 1650 } 1651 if (skb) 1652 mld_sendpack(skb); 1653 } 1654 1655 /* 1656 * remove zero-count source records from a source filter list 1657 */ 1658 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1659 { 1660 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1661 1662 psf_prev = NULL; 1663 for (psf=*ppsf; psf; psf = psf_next) { 1664 psf_next = psf->sf_next; 1665 if (psf->sf_crcount == 0) { 1666 if (psf_prev) 1667 psf_prev->sf_next = psf->sf_next; 1668 else 1669 *ppsf = psf->sf_next; 1670 kfree(psf); 1671 } else 1672 psf_prev = psf; 1673 } 1674 } 1675 1676 static void mld_send_cr(struct inet6_dev *idev) 1677 { 1678 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1679 struct sk_buff *skb = NULL; 1680 int type, dtype; 1681 1682 read_lock_bh(&idev->lock); 1683 write_lock_bh(&idev->mc_lock); 1684 1685 /* deleted MCA's */ 1686 pmc_prev = NULL; 1687 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1688 pmc_next = pmc->next; 1689 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1690 type = MLD2_BLOCK_OLD_SOURCES; 1691 dtype = MLD2_BLOCK_OLD_SOURCES; 1692 skb = add_grec(skb, pmc, type, 1, 0); 1693 skb = add_grec(skb, pmc, dtype, 1, 1); 1694 } 1695 if (pmc->mca_crcount) { 1696 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1697 type = MLD2_CHANGE_TO_INCLUDE; 1698 skb = add_grec(skb, pmc, type, 1, 0); 1699 } 1700 pmc->mca_crcount--; 1701 if (pmc->mca_crcount == 0) { 1702 mld_clear_zeros(&pmc->mca_tomb); 1703 mld_clear_zeros(&pmc->mca_sources); 1704 } 1705 } 1706 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1707 !pmc->mca_sources) { 1708 if (pmc_prev) 1709 pmc_prev->next = pmc_next; 1710 else 1711 idev->mc_tomb = pmc_next; 1712 in6_dev_put(pmc->idev); 1713 kfree(pmc); 1714 } else 1715 pmc_prev = pmc; 1716 } 1717 write_unlock_bh(&idev->mc_lock); 1718 1719 /* change recs */ 1720 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1721 spin_lock_bh(&pmc->mca_lock); 1722 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1723 type = MLD2_BLOCK_OLD_SOURCES; 1724 dtype = MLD2_ALLOW_NEW_SOURCES; 1725 } else { 1726 type = MLD2_ALLOW_NEW_SOURCES; 1727 dtype = MLD2_BLOCK_OLD_SOURCES; 1728 } 1729 skb = add_grec(skb, pmc, type, 0, 0); 1730 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1731 1732 /* filter mode changes */ 1733 if (pmc->mca_crcount) { 1734 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1735 type = MLD2_CHANGE_TO_EXCLUDE; 1736 else 1737 type = MLD2_CHANGE_TO_INCLUDE; 1738 skb = add_grec(skb, pmc, type, 0, 0); 1739 pmc->mca_crcount--; 1740 } 1741 spin_unlock_bh(&pmc->mca_lock); 1742 } 1743 read_unlock_bh(&idev->lock); 1744 if (!skb) 1745 return; 1746 (void) mld_sendpack(skb); 1747 } 1748 1749 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1750 { 1751 struct sock *sk = igmp6_socket->sk; 1752 struct inet6_dev *idev; 1753 struct sk_buff *skb; 1754 struct icmp6hdr *hdr; 1755 struct in6_addr *snd_addr; 1756 struct in6_addr *addrp; 1757 struct in6_addr addr_buf; 1758 struct in6_addr all_routers; 1759 int err, len, payload_len, full_len; 1760 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1761 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1762 IPV6_TLV_PADN, 0 }; 1763 1764 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1765 snd_addr = addr; 1766 if (type == ICMPV6_MGM_REDUCTION) { 1767 snd_addr = &all_routers; 1768 ipv6_addr_all_routers(&all_routers); 1769 } 1770 1771 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1772 payload_len = len + sizeof(ra); 1773 full_len = sizeof(struct ipv6hdr) + payload_len; 1774 1775 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1776 1777 if (skb == NULL) { 1778 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1779 return; 1780 } 1781 1782 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1783 1784 if (ipv6_get_lladdr(dev, &addr_buf)) { 1785 /* <draft-ietf-magma-mld-source-05.txt>: 1786 * use unspecified address as the source address 1787 * when a valid link-local address is not available. 1788 */ 1789 memset(&addr_buf, 0, sizeof(addr_buf)); 1790 } 1791 1792 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1793 1794 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1795 1796 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1797 memset(hdr, 0, sizeof(struct icmp6hdr)); 1798 hdr->icmp6_type = type; 1799 1800 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1801 ipv6_addr_copy(addrp, addr); 1802 1803 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1804 IPPROTO_ICMPV6, 1805 csum_partial((__u8 *) hdr, len, 0)); 1806 1807 idev = in6_dev_get(skb->dev); 1808 1809 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1810 mld_dev_queue_xmit); 1811 if (!err) { 1812 if (type == ICMPV6_MGM_REDUCTION) 1813 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); 1814 else 1815 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); 1816 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1817 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1818 } else 1819 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1820 1821 if (likely(idev != NULL)) 1822 in6_dev_put(idev); 1823 return; 1824 } 1825 1826 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1827 struct in6_addr *psfsrc) 1828 { 1829 struct ip6_sf_list *psf, *psf_prev; 1830 int rv = 0; 1831 1832 psf_prev = NULL; 1833 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1834 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1835 break; 1836 psf_prev = psf; 1837 } 1838 if (!psf || psf->sf_count[sfmode] == 0) { 1839 /* source filter not found, or count wrong => bug */ 1840 return -ESRCH; 1841 } 1842 psf->sf_count[sfmode]--; 1843 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1844 struct inet6_dev *idev = pmc->idev; 1845 1846 /* no more filters for this source */ 1847 if (psf_prev) 1848 psf_prev->sf_next = psf->sf_next; 1849 else 1850 pmc->mca_sources = psf->sf_next; 1851 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1852 !MLD_V1_SEEN(idev)) { 1853 psf->sf_crcount = idev->mc_qrv; 1854 psf->sf_next = pmc->mca_tomb; 1855 pmc->mca_tomb = psf; 1856 rv = 1; 1857 } else 1858 kfree(psf); 1859 } 1860 return rv; 1861 } 1862 1863 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1864 int sfmode, int sfcount, struct in6_addr *psfsrc, 1865 int delta) 1866 { 1867 struct ifmcaddr6 *pmc; 1868 int changerec = 0; 1869 int i, err; 1870 1871 if (!idev) 1872 return -ENODEV; 1873 read_lock_bh(&idev->lock); 1874 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1875 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1876 break; 1877 } 1878 if (!pmc) { 1879 /* MCA not found?? bug */ 1880 read_unlock_bh(&idev->lock); 1881 return -ESRCH; 1882 } 1883 spin_lock_bh(&pmc->mca_lock); 1884 sf_markstate(pmc); 1885 if (!delta) { 1886 if (!pmc->mca_sfcount[sfmode]) { 1887 spin_unlock_bh(&pmc->mca_lock); 1888 read_unlock_bh(&idev->lock); 1889 return -EINVAL; 1890 } 1891 pmc->mca_sfcount[sfmode]--; 1892 } 1893 err = 0; 1894 for (i=0; i<sfcount; i++) { 1895 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1896 1897 changerec |= rv > 0; 1898 if (!err && rv < 0) 1899 err = rv; 1900 } 1901 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1902 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1903 pmc->mca_sfcount[MCAST_INCLUDE]) { 1904 struct ip6_sf_list *psf; 1905 1906 /* filter mode change */ 1907 pmc->mca_sfmode = MCAST_INCLUDE; 1908 pmc->mca_crcount = idev->mc_qrv; 1909 idev->mc_ifc_count = pmc->mca_crcount; 1910 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1911 psf->sf_crcount = 0; 1912 mld_ifc_event(pmc->idev); 1913 } else if (sf_setstate(pmc) || changerec) 1914 mld_ifc_event(pmc->idev); 1915 spin_unlock_bh(&pmc->mca_lock); 1916 read_unlock_bh(&idev->lock); 1917 return err; 1918 } 1919 1920 /* 1921 * Add multicast single-source filter to the interface list 1922 */ 1923 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1924 struct in6_addr *psfsrc, int delta) 1925 { 1926 struct ip6_sf_list *psf, *psf_prev; 1927 1928 psf_prev = NULL; 1929 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1930 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1931 break; 1932 psf_prev = psf; 1933 } 1934 if (!psf) { 1935 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1936 if (!psf) 1937 return -ENOBUFS; 1938 1939 psf->sf_addr = *psfsrc; 1940 if (psf_prev) { 1941 psf_prev->sf_next = psf; 1942 } else 1943 pmc->mca_sources = psf; 1944 } 1945 psf->sf_count[sfmode]++; 1946 return 0; 1947 } 1948 1949 static void sf_markstate(struct ifmcaddr6 *pmc) 1950 { 1951 struct ip6_sf_list *psf; 1952 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1953 1954 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1955 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1956 psf->sf_oldin = mca_xcount == 1957 psf->sf_count[MCAST_EXCLUDE] && 1958 !psf->sf_count[MCAST_INCLUDE]; 1959 } else 1960 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1961 } 1962 1963 static int sf_setstate(struct ifmcaddr6 *pmc) 1964 { 1965 struct ip6_sf_list *psf, *dpsf; 1966 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1967 int qrv = pmc->idev->mc_qrv; 1968 int new_in, rv; 1969 1970 rv = 0; 1971 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1972 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1973 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1974 !psf->sf_count[MCAST_INCLUDE]; 1975 } else 1976 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1977 if (new_in) { 1978 if (!psf->sf_oldin) { 1979 struct ip6_sf_list *prev = NULL; 1980 1981 for (dpsf=pmc->mca_tomb; dpsf; 1982 dpsf=dpsf->sf_next) { 1983 if (ipv6_addr_equal(&dpsf->sf_addr, 1984 &psf->sf_addr)) 1985 break; 1986 prev = dpsf; 1987 } 1988 if (dpsf) { 1989 if (prev) 1990 prev->sf_next = dpsf->sf_next; 1991 else 1992 pmc->mca_tomb = dpsf->sf_next; 1993 kfree(dpsf); 1994 } 1995 psf->sf_crcount = qrv; 1996 rv++; 1997 } 1998 } else if (psf->sf_oldin) { 1999 psf->sf_crcount = 0; 2000 /* 2001 * add or update "delete" records if an active filter 2002 * is now inactive 2003 */ 2004 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) 2005 if (ipv6_addr_equal(&dpsf->sf_addr, 2006 &psf->sf_addr)) 2007 break; 2008 if (!dpsf) { 2009 dpsf = (struct ip6_sf_list *) 2010 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2011 if (!dpsf) 2012 continue; 2013 *dpsf = *psf; 2014 /* pmc->mca_lock held by callers */ 2015 dpsf->sf_next = pmc->mca_tomb; 2016 pmc->mca_tomb = dpsf; 2017 } 2018 dpsf->sf_crcount = qrv; 2019 rv++; 2020 } 2021 } 2022 return rv; 2023 } 2024 2025 /* 2026 * Add multicast source filter list to the interface list 2027 */ 2028 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 2029 int sfmode, int sfcount, struct in6_addr *psfsrc, 2030 int delta) 2031 { 2032 struct ifmcaddr6 *pmc; 2033 int isexclude; 2034 int i, err; 2035 2036 if (!idev) 2037 return -ENODEV; 2038 read_lock_bh(&idev->lock); 2039 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 2040 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 2041 break; 2042 } 2043 if (!pmc) { 2044 /* MCA not found?? bug */ 2045 read_unlock_bh(&idev->lock); 2046 return -ESRCH; 2047 } 2048 spin_lock_bh(&pmc->mca_lock); 2049 2050 sf_markstate(pmc); 2051 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 2052 if (!delta) 2053 pmc->mca_sfcount[sfmode]++; 2054 err = 0; 2055 for (i=0; i<sfcount; i++) { 2056 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 2057 if (err) 2058 break; 2059 } 2060 if (err) { 2061 int j; 2062 2063 if (!delta) 2064 pmc->mca_sfcount[sfmode]--; 2065 for (j=0; j<i; j++) 2066 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 2067 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 2068 struct inet6_dev *idev = pmc->idev; 2069 struct ip6_sf_list *psf; 2070 2071 /* filter mode change */ 2072 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 2073 pmc->mca_sfmode = MCAST_EXCLUDE; 2074 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 2075 pmc->mca_sfmode = MCAST_INCLUDE; 2076 /* else no filters; keep old mode for reports */ 2077 2078 pmc->mca_crcount = idev->mc_qrv; 2079 idev->mc_ifc_count = pmc->mca_crcount; 2080 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 2081 psf->sf_crcount = 0; 2082 mld_ifc_event(idev); 2083 } else if (sf_setstate(pmc)) 2084 mld_ifc_event(idev); 2085 spin_unlock_bh(&pmc->mca_lock); 2086 read_unlock_bh(&idev->lock); 2087 return err; 2088 } 2089 2090 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 2091 { 2092 struct ip6_sf_list *psf, *nextpsf; 2093 2094 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 2095 nextpsf = psf->sf_next; 2096 kfree(psf); 2097 } 2098 pmc->mca_tomb = NULL; 2099 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 2100 nextpsf = psf->sf_next; 2101 kfree(psf); 2102 } 2103 pmc->mca_sources = NULL; 2104 pmc->mca_sfmode = MCAST_EXCLUDE; 2105 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 2106 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 2107 } 2108 2109 2110 static void igmp6_join_group(struct ifmcaddr6 *ma) 2111 { 2112 unsigned long delay; 2113 2114 if (ma->mca_flags & MAF_NOREPORT) 2115 return; 2116 2117 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2118 2119 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2120 2121 spin_lock_bh(&ma->mca_lock); 2122 if (del_timer(&ma->mca_timer)) { 2123 atomic_dec(&ma->mca_refcnt); 2124 delay = ma->mca_timer.expires - jiffies; 2125 } 2126 2127 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2128 atomic_inc(&ma->mca_refcnt); 2129 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2130 spin_unlock_bh(&ma->mca_lock); 2131 } 2132 2133 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2134 struct inet6_dev *idev) 2135 { 2136 int err; 2137 2138 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, 2139 * so no other readers or writers of iml or its sflist 2140 */ 2141 if (iml->sflist == 0) { 2142 /* any-source empty exclude case */ 2143 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2144 } 2145 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2146 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2147 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2148 iml->sflist = NULL; 2149 return err; 2150 } 2151 2152 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2153 { 2154 if (MLD_V1_SEEN(ma->idev)) { 2155 if (ma->mca_flags & MAF_LAST_REPORTER) 2156 igmp6_send(&ma->mca_addr, ma->idev->dev, 2157 ICMPV6_MGM_REDUCTION); 2158 } else { 2159 mld_add_delrec(ma->idev, ma); 2160 mld_ifc_event(ma->idev); 2161 } 2162 } 2163 2164 static void mld_gq_timer_expire(unsigned long data) 2165 { 2166 struct inet6_dev *idev = (struct inet6_dev *)data; 2167 2168 idev->mc_gq_running = 0; 2169 mld_send_report(idev, NULL); 2170 __in6_dev_put(idev); 2171 } 2172 2173 static void mld_ifc_timer_expire(unsigned long data) 2174 { 2175 struct inet6_dev *idev = (struct inet6_dev *)data; 2176 2177 mld_send_cr(idev); 2178 if (idev->mc_ifc_count) { 2179 idev->mc_ifc_count--; 2180 if (idev->mc_ifc_count) 2181 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2182 } 2183 __in6_dev_put(idev); 2184 } 2185 2186 static void mld_ifc_event(struct inet6_dev *idev) 2187 { 2188 if (MLD_V1_SEEN(idev)) 2189 return; 2190 idev->mc_ifc_count = idev->mc_qrv; 2191 mld_ifc_start_timer(idev, 1); 2192 } 2193 2194 2195 static void igmp6_timer_handler(unsigned long data) 2196 { 2197 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2198 2199 if (MLD_V1_SEEN(ma->idev)) 2200 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2201 else 2202 mld_send_report(ma->idev, ma); 2203 2204 spin_lock(&ma->mca_lock); 2205 ma->mca_flags |= MAF_LAST_REPORTER; 2206 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2207 spin_unlock(&ma->mca_lock); 2208 ma_put(ma); 2209 } 2210 2211 /* Device going down */ 2212 2213 void ipv6_mc_down(struct inet6_dev *idev) 2214 { 2215 struct ifmcaddr6 *i; 2216 2217 /* Withdraw multicast list */ 2218 2219 read_lock_bh(&idev->lock); 2220 idev->mc_ifc_count = 0; 2221 if (del_timer(&idev->mc_ifc_timer)) 2222 __in6_dev_put(idev); 2223 idev->mc_gq_running = 0; 2224 if (del_timer(&idev->mc_gq_timer)) 2225 __in6_dev_put(idev); 2226 2227 for (i = idev->mc_list; i; i=i->next) 2228 igmp6_group_dropped(i); 2229 read_unlock_bh(&idev->lock); 2230 2231 mld_clear_delrec(idev); 2232 } 2233 2234 2235 /* Device going up */ 2236 2237 void ipv6_mc_up(struct inet6_dev *idev) 2238 { 2239 struct ifmcaddr6 *i; 2240 2241 /* Install multicast list, except for all-nodes (already installed) */ 2242 2243 read_lock_bh(&idev->lock); 2244 for (i = idev->mc_list; i; i=i->next) 2245 igmp6_group_added(i); 2246 read_unlock_bh(&idev->lock); 2247 } 2248 2249 /* IPv6 device initialization. */ 2250 2251 void ipv6_mc_init_dev(struct inet6_dev *idev) 2252 { 2253 struct in6_addr maddr; 2254 2255 write_lock_bh(&idev->lock); 2256 rwlock_init(&idev->mc_lock); 2257 idev->mc_gq_running = 0; 2258 init_timer(&idev->mc_gq_timer); 2259 idev->mc_gq_timer.data = (unsigned long) idev; 2260 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2261 idev->mc_tomb = NULL; 2262 idev->mc_ifc_count = 0; 2263 init_timer(&idev->mc_ifc_timer); 2264 idev->mc_ifc_timer.data = (unsigned long) idev; 2265 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2266 idev->mc_qrv = MLD_QRV_DEFAULT; 2267 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2268 idev->mc_v1_seen = 0; 2269 write_unlock_bh(&idev->lock); 2270 2271 /* Add all-nodes address. */ 2272 ipv6_addr_all_nodes(&maddr); 2273 ipv6_dev_mc_inc(idev->dev, &maddr); 2274 } 2275 2276 /* 2277 * Device is about to be destroyed: clean up. 2278 */ 2279 2280 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2281 { 2282 struct ifmcaddr6 *i; 2283 struct in6_addr maddr; 2284 2285 /* Deactivate timers */ 2286 ipv6_mc_down(idev); 2287 2288 /* Delete all-nodes address. */ 2289 ipv6_addr_all_nodes(&maddr); 2290 2291 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2292 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2293 * fail. 2294 */ 2295 __ipv6_dev_mc_dec(idev, &maddr); 2296 2297 if (idev->cnf.forwarding) { 2298 ipv6_addr_all_routers(&maddr); 2299 __ipv6_dev_mc_dec(idev, &maddr); 2300 } 2301 2302 write_lock_bh(&idev->lock); 2303 while ((i = idev->mc_list) != NULL) { 2304 idev->mc_list = i->next; 2305 write_unlock_bh(&idev->lock); 2306 2307 igmp6_group_dropped(i); 2308 ma_put(i); 2309 2310 write_lock_bh(&idev->lock); 2311 } 2312 write_unlock_bh(&idev->lock); 2313 } 2314 2315 #ifdef CONFIG_PROC_FS 2316 struct igmp6_mc_iter_state { 2317 struct net_device *dev; 2318 struct inet6_dev *idev; 2319 }; 2320 2321 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2322 2323 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2324 { 2325 struct ifmcaddr6 *im = NULL; 2326 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2327 2328 for (state->dev = dev_base, state->idev = NULL; 2329 state->dev; 2330 state->dev = state->dev->next) { 2331 struct inet6_dev *idev; 2332 idev = in6_dev_get(state->dev); 2333 if (!idev) 2334 continue; 2335 read_lock_bh(&idev->lock); 2336 im = idev->mc_list; 2337 if (im) { 2338 state->idev = idev; 2339 break; 2340 } 2341 read_unlock_bh(&idev->lock); 2342 in6_dev_put(idev); 2343 } 2344 return im; 2345 } 2346 2347 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2348 { 2349 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2350 2351 im = im->next; 2352 while (!im) { 2353 if (likely(state->idev != NULL)) { 2354 read_unlock_bh(&state->idev->lock); 2355 in6_dev_put(state->idev); 2356 } 2357 state->dev = state->dev->next; 2358 if (!state->dev) { 2359 state->idev = NULL; 2360 break; 2361 } 2362 state->idev = in6_dev_get(state->dev); 2363 if (!state->idev) 2364 continue; 2365 read_lock_bh(&state->idev->lock); 2366 im = state->idev->mc_list; 2367 } 2368 return im; 2369 } 2370 2371 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2372 { 2373 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2374 if (im) 2375 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2376 --pos; 2377 return pos ? NULL : im; 2378 } 2379 2380 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2381 { 2382 read_lock(&dev_base_lock); 2383 return igmp6_mc_get_idx(seq, *pos); 2384 } 2385 2386 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2387 { 2388 struct ifmcaddr6 *im; 2389 im = igmp6_mc_get_next(seq, v); 2390 ++*pos; 2391 return im; 2392 } 2393 2394 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2395 { 2396 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2397 if (likely(state->idev != NULL)) { 2398 read_unlock_bh(&state->idev->lock); 2399 in6_dev_put(state->idev); 2400 state->idev = NULL; 2401 } 2402 state->dev = NULL; 2403 read_unlock(&dev_base_lock); 2404 } 2405 2406 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2407 { 2408 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2409 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2410 2411 seq_printf(seq, 2412 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n", 2413 state->dev->ifindex, state->dev->name, 2414 NIP6(im->mca_addr), 2415 im->mca_users, im->mca_flags, 2416 (im->mca_flags&MAF_TIMER_RUNNING) ? 2417 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2418 return 0; 2419 } 2420 2421 static struct seq_operations igmp6_mc_seq_ops = { 2422 .start = igmp6_mc_seq_start, 2423 .next = igmp6_mc_seq_next, 2424 .stop = igmp6_mc_seq_stop, 2425 .show = igmp6_mc_seq_show, 2426 }; 2427 2428 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2429 { 2430 struct seq_file *seq; 2431 int rc = -ENOMEM; 2432 struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2433 2434 if (!s) 2435 goto out; 2436 2437 rc = seq_open(file, &igmp6_mc_seq_ops); 2438 if (rc) 2439 goto out_kfree; 2440 2441 seq = file->private_data; 2442 seq->private = s; 2443 out: 2444 return rc; 2445 out_kfree: 2446 kfree(s); 2447 goto out; 2448 } 2449 2450 static struct file_operations igmp6_mc_seq_fops = { 2451 .owner = THIS_MODULE, 2452 .open = igmp6_mc_seq_open, 2453 .read = seq_read, 2454 .llseek = seq_lseek, 2455 .release = seq_release_private, 2456 }; 2457 2458 struct igmp6_mcf_iter_state { 2459 struct net_device *dev; 2460 struct inet6_dev *idev; 2461 struct ifmcaddr6 *im; 2462 }; 2463 2464 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2465 2466 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2467 { 2468 struct ip6_sf_list *psf = NULL; 2469 struct ifmcaddr6 *im = NULL; 2470 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2471 2472 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2473 state->dev; 2474 state->dev = state->dev->next) { 2475 struct inet6_dev *idev; 2476 idev = in6_dev_get(state->dev); 2477 if (unlikely(idev == NULL)) 2478 continue; 2479 read_lock_bh(&idev->lock); 2480 im = idev->mc_list; 2481 if (likely(im != NULL)) { 2482 spin_lock_bh(&im->mca_lock); 2483 psf = im->mca_sources; 2484 if (likely(psf != NULL)) { 2485 state->im = im; 2486 state->idev = idev; 2487 break; 2488 } 2489 spin_unlock_bh(&im->mca_lock); 2490 } 2491 read_unlock_bh(&idev->lock); 2492 in6_dev_put(idev); 2493 } 2494 return psf; 2495 } 2496 2497 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2498 { 2499 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2500 2501 psf = psf->sf_next; 2502 while (!psf) { 2503 spin_unlock_bh(&state->im->mca_lock); 2504 state->im = state->im->next; 2505 while (!state->im) { 2506 if (likely(state->idev != NULL)) { 2507 read_unlock_bh(&state->idev->lock); 2508 in6_dev_put(state->idev); 2509 } 2510 state->dev = state->dev->next; 2511 if (!state->dev) { 2512 state->idev = NULL; 2513 goto out; 2514 } 2515 state->idev = in6_dev_get(state->dev); 2516 if (!state->idev) 2517 continue; 2518 read_lock_bh(&state->idev->lock); 2519 state->im = state->idev->mc_list; 2520 } 2521 if (!state->im) 2522 break; 2523 spin_lock_bh(&state->im->mca_lock); 2524 psf = state->im->mca_sources; 2525 } 2526 out: 2527 return psf; 2528 } 2529 2530 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2531 { 2532 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2533 if (psf) 2534 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2535 --pos; 2536 return pos ? NULL : psf; 2537 } 2538 2539 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2540 { 2541 read_lock(&dev_base_lock); 2542 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2543 } 2544 2545 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2546 { 2547 struct ip6_sf_list *psf; 2548 if (v == SEQ_START_TOKEN) 2549 psf = igmp6_mcf_get_first(seq); 2550 else 2551 psf = igmp6_mcf_get_next(seq, v); 2552 ++*pos; 2553 return psf; 2554 } 2555 2556 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2557 { 2558 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2559 if (likely(state->im != NULL)) { 2560 spin_unlock_bh(&state->im->mca_lock); 2561 state->im = NULL; 2562 } 2563 if (likely(state->idev != NULL)) { 2564 read_unlock_bh(&state->idev->lock); 2565 in6_dev_put(state->idev); 2566 state->idev = NULL; 2567 } 2568 state->dev = NULL; 2569 read_unlock(&dev_base_lock); 2570 } 2571 2572 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2573 { 2574 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2575 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2576 2577 if (v == SEQ_START_TOKEN) { 2578 seq_printf(seq, 2579 "%3s %6s " 2580 "%32s %32s %6s %6s\n", "Idx", 2581 "Device", "Multicast Address", 2582 "Source Address", "INC", "EXC"); 2583 } else { 2584 seq_printf(seq, 2585 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n", 2586 state->dev->ifindex, state->dev->name, 2587 NIP6(state->im->mca_addr), 2588 NIP6(psf->sf_addr), 2589 psf->sf_count[MCAST_INCLUDE], 2590 psf->sf_count[MCAST_EXCLUDE]); 2591 } 2592 return 0; 2593 } 2594 2595 static struct seq_operations igmp6_mcf_seq_ops = { 2596 .start = igmp6_mcf_seq_start, 2597 .next = igmp6_mcf_seq_next, 2598 .stop = igmp6_mcf_seq_stop, 2599 .show = igmp6_mcf_seq_show, 2600 }; 2601 2602 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2603 { 2604 struct seq_file *seq; 2605 int rc = -ENOMEM; 2606 struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2607 2608 if (!s) 2609 goto out; 2610 2611 rc = seq_open(file, &igmp6_mcf_seq_ops); 2612 if (rc) 2613 goto out_kfree; 2614 2615 seq = file->private_data; 2616 seq->private = s; 2617 out: 2618 return rc; 2619 out_kfree: 2620 kfree(s); 2621 goto out; 2622 } 2623 2624 static struct file_operations igmp6_mcf_seq_fops = { 2625 .owner = THIS_MODULE, 2626 .open = igmp6_mcf_seq_open, 2627 .read = seq_read, 2628 .llseek = seq_lseek, 2629 .release = seq_release_private, 2630 }; 2631 #endif 2632 2633 int __init igmp6_init(struct net_proto_family *ops) 2634 { 2635 struct ipv6_pinfo *np; 2636 struct sock *sk; 2637 int err; 2638 2639 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2640 if (err < 0) { 2641 printk(KERN_ERR 2642 "Failed to initialize the IGMP6 control socket (err %d).\n", 2643 err); 2644 igmp6_socket = NULL; /* For safety. */ 2645 return err; 2646 } 2647 2648 sk = igmp6_socket->sk; 2649 sk->sk_allocation = GFP_ATOMIC; 2650 sk->sk_prot->unhash(sk); 2651 2652 np = inet6_sk(sk); 2653 np->hop_limit = 1; 2654 2655 #ifdef CONFIG_PROC_FS 2656 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2657 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2658 #endif 2659 2660 return 0; 2661 } 2662 2663 void igmp6_cleanup(void) 2664 { 2665 sock_release(igmp6_socket); 2666 igmp6_socket = NULL; /* for safety */ 2667 2668 #ifdef CONFIG_PROC_FS 2669 proc_net_remove("mcfilter6"); 2670 proc_net_remove("igmp6"); 2671 #endif 2672 } 2673