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 10 174 175 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 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 err; 364 365 if (pgsr->gsr_group.ss_family != AF_INET6 || 366 pgsr->gsr_source.ss_family != AF_INET6) 367 return -EINVAL; 368 369 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; 370 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; 371 372 if (!ipv6_addr_is_multicast(group)) 373 return -EINVAL; 374 375 idev = ip6_mc_find_dev(group, pgsr->gsr_interface); 376 if (!idev) 377 return -ENODEV; 378 dev = idev->dev; 379 380 err = -EADDRNOTAVAIL; 381 382 read_lock_bh(&ipv6_sk_mc_lock); 383 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 384 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) 385 continue; 386 if (ipv6_addr_equal(&pmc->addr, group)) 387 break; 388 } 389 if (!pmc) { /* must have a prior join */ 390 err = -EINVAL; 391 goto done; 392 } 393 /* if a source filter was set, must be the same mode as before */ 394 if (pmc->sflist) { 395 if (pmc->sfmode != omode) { 396 err = -EINVAL; 397 goto done; 398 } 399 } else if (pmc->sfmode != omode) { 400 /* allow mode switches for empty-set filters */ 401 ip6_mc_add_src(idev, group, omode, 0, NULL, 0); 402 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 403 pmc->sfmode = omode; 404 } 405 406 psl = pmc->sflist; 407 if (!add) { 408 if (!psl) 409 goto done; /* err = -EADDRNOTAVAIL */ 410 rv = !0; 411 for (i=0; i<psl->sl_count; i++) { 412 rv = memcmp(&psl->sl_addr[i], source, 413 sizeof(struct in6_addr)); 414 if (rv == 0) 415 break; 416 } 417 if (rv) /* source not found */ 418 goto done; /* err = -EADDRNOTAVAIL */ 419 420 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 421 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 422 leavegroup = 1; 423 goto done; 424 } 425 426 /* update the interface filter */ 427 ip6_mc_del_src(idev, group, omode, 1, source, 1); 428 429 for (j=i+1; j<psl->sl_count; j++) 430 psl->sl_addr[j-1] = psl->sl_addr[j]; 431 psl->sl_count--; 432 err = 0; 433 goto done; 434 } 435 /* else, add a new source to the filter */ 436 437 if (psl && psl->sl_count >= sysctl_mld_max_msf) { 438 err = -ENOBUFS; 439 goto done; 440 } 441 if (!psl || psl->sl_count == psl->sl_max) { 442 struct ip6_sf_socklist *newpsl; 443 int count = IP6_SFBLOCK; 444 445 if (psl) 446 count += psl->sl_max; 447 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk, 448 IP6_SFLSIZE(count), GFP_ATOMIC); 449 if (!newpsl) { 450 err = -ENOBUFS; 451 goto done; 452 } 453 newpsl->sl_max = count; 454 newpsl->sl_count = count - IP6_SFBLOCK; 455 if (psl) { 456 for (i=0; i<psl->sl_count; i++) 457 newpsl->sl_addr[i] = psl->sl_addr[i]; 458 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 459 } 460 pmc->sflist = psl = newpsl; 461 } 462 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 463 for (i=0; i<psl->sl_count; i++) { 464 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); 465 if (rv == 0) 466 break; 467 } 468 if (rv == 0) /* address already there is an error */ 469 goto done; 470 for (j=psl->sl_count-1; j>=i; j--) 471 psl->sl_addr[j+1] = psl->sl_addr[j]; 472 psl->sl_addr[i] = *source; 473 psl->sl_count++; 474 err = 0; 475 /* update the interface list */ 476 ip6_mc_add_src(idev, group, omode, 1, source, 1); 477 done: 478 read_unlock_bh(&ipv6_sk_mc_lock); 479 read_unlock_bh(&idev->lock); 480 in6_dev_put(idev); 481 dev_put(dev); 482 if (leavegroup) 483 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 484 return err; 485 } 486 487 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) 488 { 489 struct in6_addr *group; 490 struct ipv6_mc_socklist *pmc; 491 struct net_device *dev; 492 struct inet6_dev *idev; 493 struct ipv6_pinfo *inet6 = inet6_sk(sk); 494 struct ip6_sf_socklist *newpsl, *psl; 495 int leavegroup = 0; 496 int i, err; 497 498 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 499 500 if (!ipv6_addr_is_multicast(group)) 501 return -EINVAL; 502 if (gsf->gf_fmode != MCAST_INCLUDE && 503 gsf->gf_fmode != MCAST_EXCLUDE) 504 return -EINVAL; 505 506 idev = ip6_mc_find_dev(group, gsf->gf_interface); 507 508 if (!idev) 509 return -ENODEV; 510 dev = idev->dev; 511 512 err = 0; 513 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { 514 leavegroup = 1; 515 goto done; 516 } 517 518 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 519 if (pmc->ifindex != gsf->gf_interface) 520 continue; 521 if (ipv6_addr_equal(&pmc->addr, group)) 522 break; 523 } 524 if (!pmc) { /* must have a prior join */ 525 err = -EINVAL; 526 goto done; 527 } 528 if (gsf->gf_numsrc) { 529 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk, 530 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC); 531 if (!newpsl) { 532 err = -ENOBUFS; 533 goto done; 534 } 535 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; 536 for (i=0; i<newpsl->sl_count; ++i) { 537 struct sockaddr_in6 *psin6; 538 539 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; 540 newpsl->sl_addr[i] = psin6->sin6_addr; 541 } 542 err = ip6_mc_add_src(idev, group, gsf->gf_fmode, 543 newpsl->sl_count, newpsl->sl_addr, 0); 544 if (err) { 545 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); 546 goto done; 547 } 548 } else { 549 newpsl = NULL; 550 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); 551 } 552 psl = pmc->sflist; 553 if (psl) { 554 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 555 psl->sl_count, psl->sl_addr, 0); 556 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); 557 } else 558 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); 559 pmc->sflist = newpsl; 560 pmc->sfmode = gsf->gf_fmode; 561 err = 0; 562 done: 563 read_unlock_bh(&idev->lock); 564 in6_dev_put(idev); 565 dev_put(dev); 566 if (leavegroup) 567 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 568 return err; 569 } 570 571 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, 572 struct group_filter __user *optval, int __user *optlen) 573 { 574 int err, i, count, copycount; 575 struct in6_addr *group; 576 struct ipv6_mc_socklist *pmc; 577 struct inet6_dev *idev; 578 struct net_device *dev; 579 struct ipv6_pinfo *inet6 = inet6_sk(sk); 580 struct ip6_sf_socklist *psl; 581 582 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; 583 584 if (!ipv6_addr_is_multicast(group)) 585 return -EINVAL; 586 587 idev = ip6_mc_find_dev(group, gsf->gf_interface); 588 589 if (!idev) 590 return -ENODEV; 591 592 dev = idev->dev; 593 594 err = -EADDRNOTAVAIL; 595 596 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { 597 if (pmc->ifindex != gsf->gf_interface) 598 continue; 599 if (ipv6_addr_equal(group, &pmc->addr)) 600 break; 601 } 602 if (!pmc) /* must have a prior join */ 603 goto done; 604 gsf->gf_fmode = pmc->sfmode; 605 psl = pmc->sflist; 606 count = psl ? psl->sl_count : 0; 607 read_unlock_bh(&idev->lock); 608 in6_dev_put(idev); 609 dev_put(dev); 610 611 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 612 gsf->gf_numsrc = count; 613 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 614 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 615 return -EFAULT; 616 } 617 for (i=0; i<copycount; i++) { 618 struct sockaddr_in6 *psin6; 619 struct sockaddr_storage ss; 620 621 psin6 = (struct sockaddr_in6 *)&ss; 622 memset(&ss, 0, sizeof(ss)); 623 psin6->sin6_family = AF_INET6; 624 psin6->sin6_addr = psl->sl_addr[i]; 625 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 626 return -EFAULT; 627 } 628 return 0; 629 done: 630 read_unlock_bh(&idev->lock); 631 in6_dev_put(idev); 632 dev_put(dev); 633 return err; 634 } 635 636 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr, 637 struct in6_addr *src_addr) 638 { 639 struct ipv6_pinfo *np = inet6_sk(sk); 640 struct ipv6_mc_socklist *mc; 641 struct ip6_sf_socklist *psl; 642 int rv = 1; 643 644 read_lock(&ipv6_sk_mc_lock); 645 for (mc = np->ipv6_mc_list; mc; mc = mc->next) { 646 if (ipv6_addr_equal(&mc->addr, mc_addr)) 647 break; 648 } 649 if (!mc) { 650 read_unlock(&ipv6_sk_mc_lock); 651 return 1; 652 } 653 psl = mc->sflist; 654 if (!psl) { 655 rv = mc->sfmode == MCAST_EXCLUDE; 656 } else { 657 int i; 658 659 for (i=0; i<psl->sl_count; i++) { 660 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) 661 break; 662 } 663 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 664 rv = 0; 665 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 666 rv = 0; 667 } 668 read_unlock(&ipv6_sk_mc_lock); 669 670 return rv; 671 } 672 673 static void ma_put(struct ifmcaddr6 *mc) 674 { 675 if (atomic_dec_and_test(&mc->mca_refcnt)) { 676 in6_dev_put(mc->idev); 677 kfree(mc); 678 } 679 } 680 681 static void igmp6_group_added(struct ifmcaddr6 *mc) 682 { 683 struct net_device *dev = mc->idev->dev; 684 char buf[MAX_ADDR_LEN]; 685 686 spin_lock_bh(&mc->mca_lock); 687 if (!(mc->mca_flags&MAF_LOADED)) { 688 mc->mca_flags |= MAF_LOADED; 689 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 690 dev_mc_add(dev, buf, dev->addr_len, 0); 691 } 692 spin_unlock_bh(&mc->mca_lock); 693 694 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) 695 return; 696 697 if (MLD_V1_SEEN(mc->idev)) { 698 igmp6_join_group(mc); 699 return; 700 } 701 /* else v2 */ 702 703 mc->mca_crcount = mc->idev->mc_qrv; 704 mld_ifc_event(mc->idev); 705 } 706 707 static void igmp6_group_dropped(struct ifmcaddr6 *mc) 708 { 709 struct net_device *dev = mc->idev->dev; 710 char buf[MAX_ADDR_LEN]; 711 712 spin_lock_bh(&mc->mca_lock); 713 if (mc->mca_flags&MAF_LOADED) { 714 mc->mca_flags &= ~MAF_LOADED; 715 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) 716 dev_mc_delete(dev, buf, dev->addr_len, 0); 717 } 718 719 if (mc->mca_flags & MAF_NOREPORT) 720 goto done; 721 spin_unlock_bh(&mc->mca_lock); 722 723 if (!mc->idev->dead) 724 igmp6_leave_group(mc); 725 726 spin_lock_bh(&mc->mca_lock); 727 if (del_timer(&mc->mca_timer)) 728 atomic_dec(&mc->mca_refcnt); 729 done: 730 ip6_mc_clear_src(mc); 731 spin_unlock_bh(&mc->mca_lock); 732 } 733 734 /* 735 * deleted ifmcaddr6 manipulation 736 */ 737 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) 738 { 739 struct ifmcaddr6 *pmc; 740 741 /* this is an "ifmcaddr6" for convenience; only the fields below 742 * are actually used. In particular, the refcnt and users are not 743 * used for management of the delete list. Using the same structure 744 * for deleted items allows change reports to use common code with 745 * non-deleted or query-response MCA's. 746 */ 747 pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC); 748 if (!pmc) 749 return; 750 memset(pmc, 0, sizeof(*pmc)); 751 spin_lock_bh(&im->mca_lock); 752 spin_lock_init(&pmc->mca_lock); 753 pmc->idev = im->idev; 754 in6_dev_hold(idev); 755 pmc->mca_addr = im->mca_addr; 756 pmc->mca_crcount = idev->mc_qrv; 757 pmc->mca_sfmode = im->mca_sfmode; 758 if (pmc->mca_sfmode == MCAST_INCLUDE) { 759 struct ip6_sf_list *psf; 760 761 pmc->mca_tomb = im->mca_tomb; 762 pmc->mca_sources = im->mca_sources; 763 im->mca_tomb = im->mca_sources = NULL; 764 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 765 psf->sf_crcount = pmc->mca_crcount; 766 } 767 spin_unlock_bh(&im->mca_lock); 768 769 write_lock_bh(&idev->mc_lock); 770 pmc->next = idev->mc_tomb; 771 idev->mc_tomb = pmc; 772 write_unlock_bh(&idev->mc_lock); 773 } 774 775 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) 776 { 777 struct ifmcaddr6 *pmc, *pmc_prev; 778 struct ip6_sf_list *psf, *psf_next; 779 780 write_lock_bh(&idev->mc_lock); 781 pmc_prev = NULL; 782 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { 783 if (ipv6_addr_equal(&pmc->mca_addr, pmca)) 784 break; 785 pmc_prev = pmc; 786 } 787 if (pmc) { 788 if (pmc_prev) 789 pmc_prev->next = pmc->next; 790 else 791 idev->mc_tomb = pmc->next; 792 } 793 write_unlock_bh(&idev->mc_lock); 794 if (pmc) { 795 for (psf=pmc->mca_tomb; psf; psf=psf_next) { 796 psf_next = psf->sf_next; 797 kfree(psf); 798 } 799 in6_dev_put(pmc->idev); 800 kfree(pmc); 801 } 802 } 803 804 static void mld_clear_delrec(struct inet6_dev *idev) 805 { 806 struct ifmcaddr6 *pmc, *nextpmc; 807 808 write_lock_bh(&idev->mc_lock); 809 pmc = idev->mc_tomb; 810 idev->mc_tomb = NULL; 811 write_unlock_bh(&idev->mc_lock); 812 813 for (; pmc; pmc = nextpmc) { 814 nextpmc = pmc->next; 815 ip6_mc_clear_src(pmc); 816 in6_dev_put(pmc->idev); 817 kfree(pmc); 818 } 819 820 /* clear dead sources, too */ 821 read_lock_bh(&idev->lock); 822 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 823 struct ip6_sf_list *psf, *psf_next; 824 825 spin_lock_bh(&pmc->mca_lock); 826 psf = pmc->mca_tomb; 827 pmc->mca_tomb = NULL; 828 spin_unlock_bh(&pmc->mca_lock); 829 for (; psf; psf=psf_next) { 830 psf_next = psf->sf_next; 831 kfree(psf); 832 } 833 } 834 read_unlock_bh(&idev->lock); 835 } 836 837 838 /* 839 * device multicast group inc (add if not found) 840 */ 841 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr) 842 { 843 struct ifmcaddr6 *mc; 844 struct inet6_dev *idev; 845 846 idev = in6_dev_get(dev); 847 848 if (idev == NULL) 849 return -EINVAL; 850 851 write_lock_bh(&idev->lock); 852 if (idev->dead) { 853 write_unlock_bh(&idev->lock); 854 in6_dev_put(idev); 855 return -ENODEV; 856 } 857 858 for (mc = idev->mc_list; mc; mc = mc->next) { 859 if (ipv6_addr_equal(&mc->mca_addr, addr)) { 860 mc->mca_users++; 861 write_unlock_bh(&idev->lock); 862 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, 863 NULL, 0); 864 in6_dev_put(idev); 865 return 0; 866 } 867 } 868 869 /* 870 * not found: create a new one. 871 */ 872 873 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); 874 875 if (mc == NULL) { 876 write_unlock_bh(&idev->lock); 877 in6_dev_put(idev); 878 return -ENOMEM; 879 } 880 881 memset(mc, 0, sizeof(struct ifmcaddr6)); 882 init_timer(&mc->mca_timer); 883 mc->mca_timer.function = igmp6_timer_handler; 884 mc->mca_timer.data = (unsigned long) mc; 885 886 ipv6_addr_copy(&mc->mca_addr, addr); 887 mc->idev = idev; 888 mc->mca_users = 1; 889 /* mca_stamp should be updated upon changes */ 890 mc->mca_cstamp = mc->mca_tstamp = jiffies; 891 atomic_set(&mc->mca_refcnt, 2); 892 spin_lock_init(&mc->mca_lock); 893 894 /* initial mode is (EX, empty) */ 895 mc->mca_sfmode = MCAST_EXCLUDE; 896 mc->mca_sfcount[MCAST_EXCLUDE] = 1; 897 898 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || 899 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 900 mc->mca_flags |= MAF_NOREPORT; 901 902 mc->next = idev->mc_list; 903 idev->mc_list = mc; 904 write_unlock_bh(&idev->lock); 905 906 mld_del_delrec(idev, &mc->mca_addr); 907 igmp6_group_added(mc); 908 ma_put(mc); 909 return 0; 910 } 911 912 /* 913 * device multicast group del 914 */ 915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) 916 { 917 struct ifmcaddr6 *ma, **map; 918 919 write_lock_bh(&idev->lock); 920 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { 921 if (ipv6_addr_equal(&ma->mca_addr, addr)) { 922 if (--ma->mca_users == 0) { 923 *map = ma->next; 924 write_unlock_bh(&idev->lock); 925 926 igmp6_group_dropped(ma); 927 928 ma_put(ma); 929 return 0; 930 } 931 write_unlock_bh(&idev->lock); 932 return 0; 933 } 934 } 935 write_unlock_bh(&idev->lock); 936 937 return -ENOENT; 938 } 939 940 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) 941 { 942 struct inet6_dev *idev = in6_dev_get(dev); 943 int err; 944 945 if (!idev) 946 return -ENODEV; 947 948 err = __ipv6_dev_mc_dec(idev, addr); 949 950 in6_dev_put(idev); 951 952 return err; 953 } 954 955 /* 956 * identify MLD packets for MLD filter exceptions 957 */ 958 int ipv6_is_mld(struct sk_buff *skb, int nexthdr) 959 { 960 struct icmp6hdr *pic; 961 962 if (nexthdr != IPPROTO_ICMPV6) 963 return 0; 964 965 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) 966 return 0; 967 968 pic = (struct icmp6hdr *)skb->h.raw; 969 970 switch (pic->icmp6_type) { 971 case ICMPV6_MGM_QUERY: 972 case ICMPV6_MGM_REPORT: 973 case ICMPV6_MGM_REDUCTION: 974 case ICMPV6_MLD2_REPORT: 975 return 1; 976 default: 977 break; 978 } 979 return 0; 980 } 981 982 /* 983 * check if the interface/address pair is valid 984 */ 985 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, 986 struct in6_addr *src_addr) 987 { 988 struct inet6_dev *idev; 989 struct ifmcaddr6 *mc; 990 int rv = 0; 991 992 idev = in6_dev_get(dev); 993 if (idev) { 994 read_lock_bh(&idev->lock); 995 for (mc = idev->mc_list; mc; mc=mc->next) { 996 if (ipv6_addr_equal(&mc->mca_addr, group)) 997 break; 998 } 999 if (mc) { 1000 if (src_addr && !ipv6_addr_any(src_addr)) { 1001 struct ip6_sf_list *psf; 1002 1003 spin_lock_bh(&mc->mca_lock); 1004 for (psf=mc->mca_sources;psf;psf=psf->sf_next) { 1005 if (ipv6_addr_equal(&psf->sf_addr, src_addr)) 1006 break; 1007 } 1008 if (psf) 1009 rv = psf->sf_count[MCAST_INCLUDE] || 1010 psf->sf_count[MCAST_EXCLUDE] != 1011 mc->mca_sfcount[MCAST_EXCLUDE]; 1012 else 1013 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; 1014 spin_unlock_bh(&mc->mca_lock); 1015 } else 1016 rv = 1; /* don't filter unspecified source */ 1017 } 1018 read_unlock_bh(&idev->lock); 1019 in6_dev_put(idev); 1020 } 1021 return rv; 1022 } 1023 1024 static void mld_gq_start_timer(struct inet6_dev *idev) 1025 { 1026 int tv = net_random() % idev->mc_maxdelay; 1027 1028 idev->mc_gq_running = 1; 1029 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) 1030 in6_dev_hold(idev); 1031 } 1032 1033 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) 1034 { 1035 int tv = net_random() % delay; 1036 1037 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) 1038 in6_dev_hold(idev); 1039 } 1040 1041 /* 1042 * IGMP handling (alias multicast ICMPv6 messages) 1043 */ 1044 1045 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) 1046 { 1047 unsigned long delay = resptime; 1048 1049 /* Do not start timer for these addresses */ 1050 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || 1051 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1052 return; 1053 1054 if (del_timer(&ma->mca_timer)) { 1055 atomic_dec(&ma->mca_refcnt); 1056 delay = ma->mca_timer.expires - jiffies; 1057 } 1058 1059 if (delay >= resptime) { 1060 if (resptime) 1061 delay = net_random() % resptime; 1062 else 1063 delay = 1; 1064 } 1065 ma->mca_timer.expires = jiffies + delay; 1066 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 1067 atomic_inc(&ma->mca_refcnt); 1068 ma->mca_flags |= MAF_TIMER_RUNNING; 1069 } 1070 1071 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, 1072 struct in6_addr *srcs) 1073 { 1074 struct ip6_sf_list *psf; 1075 int i, scount; 1076 1077 scount = 0; 1078 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1079 if (scount == nsrcs) 1080 break; 1081 for (i=0; i<nsrcs; i++) 1082 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { 1083 psf->sf_gsresp = 1; 1084 scount++; 1085 break; 1086 } 1087 } 1088 } 1089 1090 int igmp6_event_query(struct sk_buff *skb) 1091 { 1092 struct mld2_query *mlh2 = NULL; 1093 struct ifmcaddr6 *ma; 1094 struct in6_addr *group; 1095 unsigned long max_delay; 1096 struct inet6_dev *idev; 1097 struct icmp6hdr *hdr; 1098 int group_type; 1099 int mark = 0; 1100 int len; 1101 1102 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1103 return -EINVAL; 1104 1105 /* compute payload length excluding extension headers */ 1106 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); 1107 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; 1108 1109 /* Drop queries with not link local source */ 1110 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL)) 1111 return -EINVAL; 1112 1113 idev = in6_dev_get(skb->dev); 1114 1115 if (idev == NULL) 1116 return 0; 1117 1118 hdr = (struct icmp6hdr *) skb->h.raw; 1119 group = (struct in6_addr *) (hdr + 1); 1120 group_type = ipv6_addr_type(group); 1121 1122 if (group_type != IPV6_ADDR_ANY && 1123 !(group_type&IPV6_ADDR_MULTICAST)) { 1124 in6_dev_put(idev); 1125 return -EINVAL; 1126 } 1127 1128 if (len == 24) { 1129 int switchback; 1130 /* MLDv1 router present */ 1131 1132 /* Translate milliseconds to jiffies */ 1133 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; 1134 1135 switchback = (idev->mc_qrv + 1) * max_delay; 1136 idev->mc_v1_seen = jiffies + switchback; 1137 1138 /* cancel the interface change timer */ 1139 idev->mc_ifc_count = 0; 1140 if (del_timer(&idev->mc_ifc_timer)) 1141 __in6_dev_put(idev); 1142 /* clear deleted report items */ 1143 mld_clear_delrec(idev); 1144 } else if (len >= 28) { 1145 int srcs_offset = sizeof(struct mld2_query) - 1146 sizeof(struct icmp6hdr); 1147 if (!pskb_may_pull(skb, srcs_offset)) { 1148 in6_dev_put(idev); 1149 return -EINVAL; 1150 } 1151 mlh2 = (struct mld2_query *) skb->h.raw; 1152 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; 1153 if (!max_delay) 1154 max_delay = 1; 1155 idev->mc_maxdelay = max_delay; 1156 if (mlh2->qrv) 1157 idev->mc_qrv = mlh2->qrv; 1158 if (group_type == IPV6_ADDR_ANY) { /* general query */ 1159 if (mlh2->nsrcs) { 1160 in6_dev_put(idev); 1161 return -EINVAL; /* no sources allowed */ 1162 } 1163 mld_gq_start_timer(idev); 1164 in6_dev_put(idev); 1165 return 0; 1166 } 1167 /* mark sources to include, if group & source-specific */ 1168 if (mlh2->nsrcs != 0) { 1169 if (!pskb_may_pull(skb, srcs_offset + 1170 mlh2->nsrcs * sizeof(struct in6_addr))) { 1171 in6_dev_put(idev); 1172 return -EINVAL; 1173 } 1174 mlh2 = (struct mld2_query *) skb->h.raw; 1175 mark = 1; 1176 } 1177 } else { 1178 in6_dev_put(idev); 1179 return -EINVAL; 1180 } 1181 1182 read_lock_bh(&idev->lock); 1183 if (group_type == IPV6_ADDR_ANY) { 1184 for (ma = idev->mc_list; ma; ma=ma->next) { 1185 spin_lock_bh(&ma->mca_lock); 1186 igmp6_group_queried(ma, max_delay); 1187 spin_unlock_bh(&ma->mca_lock); 1188 } 1189 } else { 1190 for (ma = idev->mc_list; ma; ma=ma->next) { 1191 if (group_type != IPV6_ADDR_ANY && 1192 !ipv6_addr_equal(group, &ma->mca_addr)) 1193 continue; 1194 spin_lock_bh(&ma->mca_lock); 1195 if (ma->mca_flags & MAF_TIMER_RUNNING) { 1196 /* gsquery <- gsquery && mark */ 1197 if (!mark) 1198 ma->mca_flags &= ~MAF_GSQUERY; 1199 } else { 1200 /* gsquery <- mark */ 1201 if (mark) 1202 ma->mca_flags |= MAF_GSQUERY; 1203 else 1204 ma->mca_flags &= ~MAF_GSQUERY; 1205 } 1206 if (ma->mca_flags & MAF_GSQUERY) 1207 mld_marksources(ma, ntohs(mlh2->nsrcs), 1208 mlh2->srcs); 1209 igmp6_group_queried(ma, max_delay); 1210 spin_unlock_bh(&ma->mca_lock); 1211 if (group_type != IPV6_ADDR_ANY) 1212 break; 1213 } 1214 } 1215 read_unlock_bh(&idev->lock); 1216 in6_dev_put(idev); 1217 1218 return 0; 1219 } 1220 1221 1222 int igmp6_event_report(struct sk_buff *skb) 1223 { 1224 struct ifmcaddr6 *ma; 1225 struct in6_addr *addrp; 1226 struct inet6_dev *idev; 1227 struct icmp6hdr *hdr; 1228 int addr_type; 1229 1230 /* Our own report looped back. Ignore it. */ 1231 if (skb->pkt_type == PACKET_LOOPBACK) 1232 return 0; 1233 1234 /* send our report if the MC router may not have heard this report */ 1235 if (skb->pkt_type != PACKET_MULTICAST && 1236 skb->pkt_type != PACKET_BROADCAST) 1237 return 0; 1238 1239 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1240 return -EINVAL; 1241 1242 hdr = (struct icmp6hdr*) skb->h.raw; 1243 1244 /* Drop reports with not link local source */ 1245 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); 1246 if (addr_type != IPV6_ADDR_ANY && 1247 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1248 return -EINVAL; 1249 1250 addrp = (struct in6_addr *) (hdr + 1); 1251 1252 idev = in6_dev_get(skb->dev); 1253 if (idev == NULL) 1254 return -ENODEV; 1255 1256 /* 1257 * Cancel the timer for this group 1258 */ 1259 1260 read_lock_bh(&idev->lock); 1261 for (ma = idev->mc_list; ma; ma=ma->next) { 1262 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1263 spin_lock(&ma->mca_lock); 1264 if (del_timer(&ma->mca_timer)) 1265 atomic_dec(&ma->mca_refcnt); 1266 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1267 spin_unlock(&ma->mca_lock); 1268 break; 1269 } 1270 } 1271 read_unlock_bh(&idev->lock); 1272 in6_dev_put(idev); 1273 return 0; 1274 } 1275 1276 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1277 int gdeleted, int sdeleted) 1278 { 1279 switch (type) { 1280 case MLD2_MODE_IS_INCLUDE: 1281 case MLD2_MODE_IS_EXCLUDE: 1282 if (gdeleted || sdeleted) 1283 return 0; 1284 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp); 1285 case MLD2_CHANGE_TO_INCLUDE: 1286 if (gdeleted || sdeleted) 1287 return 0; 1288 return psf->sf_count[MCAST_INCLUDE] != 0; 1289 case MLD2_CHANGE_TO_EXCLUDE: 1290 if (gdeleted || sdeleted) 1291 return 0; 1292 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1293 psf->sf_count[MCAST_INCLUDE]) 1294 return 0; 1295 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1296 psf->sf_count[MCAST_EXCLUDE]; 1297 case MLD2_ALLOW_NEW_SOURCES: 1298 if (gdeleted || !psf->sf_crcount) 1299 return 0; 1300 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1301 case MLD2_BLOCK_OLD_SOURCES: 1302 if (pmc->mca_sfmode == MCAST_INCLUDE) 1303 return gdeleted || (psf->sf_crcount && sdeleted); 1304 return psf->sf_crcount && !gdeleted && !sdeleted; 1305 } 1306 return 0; 1307 } 1308 1309 static int 1310 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1311 { 1312 struct ip6_sf_list *psf; 1313 int scount = 0; 1314 1315 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1316 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1317 continue; 1318 scount++; 1319 } 1320 return scount; 1321 } 1322 1323 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1324 { 1325 struct sock *sk = igmp6_socket->sk; 1326 struct sk_buff *skb; 1327 struct mld2_report *pmr; 1328 struct in6_addr addr_buf; 1329 int err; 1330 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1331 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1332 IPV6_TLV_PADN, 0 }; 1333 1334 /* we assume size > sizeof(ra) here */ 1335 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1336 1337 if (skb == 0) 1338 return NULL; 1339 1340 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1341 1342 if (ipv6_get_lladdr(dev, &addr_buf)) { 1343 /* <draft-ietf-magma-mld-source-05.txt>: 1344 * use unspecified address as the source address 1345 * when a valid link-local address is not available. 1346 */ 1347 memset(&addr_buf, 0, sizeof(addr_buf)); 1348 } 1349 1350 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1351 1352 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1353 1354 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); 1355 skb->h.raw = (unsigned char *)pmr; 1356 pmr->type = ICMPV6_MLD2_REPORT; 1357 pmr->resv1 = 0; 1358 pmr->csum = 0; 1359 pmr->resv2 = 0; 1360 pmr->ngrec = 0; 1361 return skb; 1362 } 1363 1364 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1365 { 1366 struct net_device *dev = skb->dev; 1367 1368 if (dev->hard_header) { 1369 unsigned char ha[MAX_ADDR_LEN]; 1370 int err; 1371 1372 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1); 1373 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); 1374 if (err < 0) { 1375 kfree_skb(skb); 1376 return err; 1377 } 1378 } 1379 return dev_queue_xmit(skb); 1380 } 1381 1382 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1383 { 1384 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1385 mld_dev_queue_xmit2); 1386 } 1387 1388 static void mld_sendpack(struct sk_buff *skb) 1389 { 1390 struct ipv6hdr *pip6 = skb->nh.ipv6h; 1391 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; 1392 int payload_len, mldlen; 1393 struct inet6_dev *idev = in6_dev_get(skb->dev); 1394 int err; 1395 1396 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1397 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - 1398 sizeof(struct ipv6hdr); 1399 mldlen = skb->tail - skb->h.raw; 1400 pip6->payload_len = htons(payload_len); 1401 1402 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1403 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); 1404 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1405 mld_dev_queue_xmit); 1406 if (!err) { 1407 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); 1408 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1409 } else 1410 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1411 1412 if (likely(idev != NULL)) 1413 in6_dev_put(idev); 1414 } 1415 1416 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1417 { 1418 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1419 } 1420 1421 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1422 int type, struct mld2_grec **ppgr) 1423 { 1424 struct net_device *dev = pmc->idev->dev; 1425 struct mld2_report *pmr; 1426 struct mld2_grec *pgr; 1427 1428 if (!skb) 1429 skb = mld_newpack(dev, dev->mtu); 1430 if (!skb) 1431 return NULL; 1432 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1433 pgr->grec_type = type; 1434 pgr->grec_auxwords = 0; 1435 pgr->grec_nsrcs = 0; 1436 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1437 pmr = (struct mld2_report *)skb->h.raw; 1438 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1439 *ppgr = pgr; 1440 return skb; 1441 } 1442 1443 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1444 skb_tailroom(skb)) : 0) 1445 1446 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1447 int type, int gdeleted, int sdeleted) 1448 { 1449 struct net_device *dev = pmc->idev->dev; 1450 struct mld2_report *pmr; 1451 struct mld2_grec *pgr = NULL; 1452 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1453 int scount, first, isquery, truncate; 1454 1455 if (pmc->mca_flags & MAF_NOREPORT) 1456 return skb; 1457 1458 isquery = type == MLD2_MODE_IS_INCLUDE || 1459 type == MLD2_MODE_IS_EXCLUDE; 1460 truncate = type == MLD2_MODE_IS_EXCLUDE || 1461 type == MLD2_CHANGE_TO_EXCLUDE; 1462 1463 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1464 1465 if (!*psf_list) { 1466 if (type == MLD2_ALLOW_NEW_SOURCES || 1467 type == MLD2_BLOCK_OLD_SOURCES) 1468 return skb; 1469 if (pmc->mca_crcount || isquery) { 1470 /* make sure we have room for group header and at 1471 * least one source. 1472 */ 1473 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+ 1474 sizeof(struct in6_addr)) { 1475 mld_sendpack(skb); 1476 skb = NULL; /* add_grhead will get a new one */ 1477 } 1478 skb = add_grhead(skb, pmc, type, &pgr); 1479 } 1480 return skb; 1481 } 1482 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; 1483 1484 /* EX and TO_EX get a fresh packet, if needed */ 1485 if (truncate) { 1486 if (pmr && pmr->ngrec && 1487 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1488 if (skb) 1489 mld_sendpack(skb); 1490 skb = mld_newpack(dev, dev->mtu); 1491 } 1492 } 1493 first = 1; 1494 scount = 0; 1495 psf_prev = NULL; 1496 for (psf=*psf_list; psf; psf=psf_next) { 1497 struct in6_addr *psrc; 1498 1499 psf_next = psf->sf_next; 1500 1501 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1502 psf_prev = psf; 1503 continue; 1504 } 1505 1506 /* clear marks on query responses */ 1507 if (isquery) 1508 psf->sf_gsresp = 0; 1509 1510 if (AVAILABLE(skb) < sizeof(*psrc) + 1511 first*sizeof(struct mld2_grec)) { 1512 if (truncate && !first) 1513 break; /* truncate these */ 1514 if (pgr) 1515 pgr->grec_nsrcs = htons(scount); 1516 if (skb) 1517 mld_sendpack(skb); 1518 skb = mld_newpack(dev, dev->mtu); 1519 first = 1; 1520 scount = 0; 1521 } 1522 if (first) { 1523 skb = add_grhead(skb, pmc, type, &pgr); 1524 first = 0; 1525 } 1526 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1527 *psrc = psf->sf_addr; 1528 scount++; 1529 if ((type == MLD2_ALLOW_NEW_SOURCES || 1530 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1531 psf->sf_crcount--; 1532 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1533 if (psf_prev) 1534 psf_prev->sf_next = psf->sf_next; 1535 else 1536 *psf_list = psf->sf_next; 1537 kfree(psf); 1538 continue; 1539 } 1540 } 1541 psf_prev = psf; 1542 } 1543 if (pgr) 1544 pgr->grec_nsrcs = htons(scount); 1545 1546 if (isquery) 1547 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1548 return skb; 1549 } 1550 1551 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1552 { 1553 struct sk_buff *skb = NULL; 1554 int type; 1555 1556 if (!pmc) { 1557 read_lock_bh(&idev->lock); 1558 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1559 if (pmc->mca_flags & MAF_NOREPORT) 1560 continue; 1561 spin_lock_bh(&pmc->mca_lock); 1562 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1563 type = MLD2_MODE_IS_EXCLUDE; 1564 else 1565 type = MLD2_MODE_IS_INCLUDE; 1566 skb = add_grec(skb, pmc, type, 0, 0); 1567 spin_unlock_bh(&pmc->mca_lock); 1568 } 1569 read_unlock_bh(&idev->lock); 1570 } else { 1571 spin_lock_bh(&pmc->mca_lock); 1572 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1573 type = MLD2_MODE_IS_EXCLUDE; 1574 else 1575 type = MLD2_MODE_IS_INCLUDE; 1576 skb = add_grec(skb, pmc, type, 0, 0); 1577 spin_unlock_bh(&pmc->mca_lock); 1578 } 1579 if (skb) 1580 mld_sendpack(skb); 1581 } 1582 1583 /* 1584 * remove zero-count source records from a source filter list 1585 */ 1586 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1587 { 1588 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1589 1590 psf_prev = NULL; 1591 for (psf=*ppsf; psf; psf = psf_next) { 1592 psf_next = psf->sf_next; 1593 if (psf->sf_crcount == 0) { 1594 if (psf_prev) 1595 psf_prev->sf_next = psf->sf_next; 1596 else 1597 *ppsf = psf->sf_next; 1598 kfree(psf); 1599 } else 1600 psf_prev = psf; 1601 } 1602 } 1603 1604 static void mld_send_cr(struct inet6_dev *idev) 1605 { 1606 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1607 struct sk_buff *skb = NULL; 1608 int type, dtype; 1609 1610 read_lock_bh(&idev->lock); 1611 write_lock_bh(&idev->mc_lock); 1612 1613 /* deleted MCA's */ 1614 pmc_prev = NULL; 1615 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1616 pmc_next = pmc->next; 1617 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1618 type = MLD2_BLOCK_OLD_SOURCES; 1619 dtype = MLD2_BLOCK_OLD_SOURCES; 1620 skb = add_grec(skb, pmc, type, 1, 0); 1621 skb = add_grec(skb, pmc, dtype, 1, 1); 1622 } 1623 if (pmc->mca_crcount) { 1624 pmc->mca_crcount--; 1625 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1626 type = MLD2_CHANGE_TO_INCLUDE; 1627 skb = add_grec(skb, pmc, type, 1, 0); 1628 } 1629 if (pmc->mca_crcount == 0) { 1630 mld_clear_zeros(&pmc->mca_tomb); 1631 mld_clear_zeros(&pmc->mca_sources); 1632 } 1633 } 1634 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1635 !pmc->mca_sources) { 1636 if (pmc_prev) 1637 pmc_prev->next = pmc_next; 1638 else 1639 idev->mc_tomb = pmc_next; 1640 in6_dev_put(pmc->idev); 1641 kfree(pmc); 1642 } else 1643 pmc_prev = pmc; 1644 } 1645 write_unlock_bh(&idev->mc_lock); 1646 1647 /* change recs */ 1648 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1649 spin_lock_bh(&pmc->mca_lock); 1650 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1651 type = MLD2_BLOCK_OLD_SOURCES; 1652 dtype = MLD2_ALLOW_NEW_SOURCES; 1653 } else { 1654 type = MLD2_ALLOW_NEW_SOURCES; 1655 dtype = MLD2_BLOCK_OLD_SOURCES; 1656 } 1657 skb = add_grec(skb, pmc, type, 0, 0); 1658 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1659 1660 /* filter mode changes */ 1661 if (pmc->mca_crcount) { 1662 pmc->mca_crcount--; 1663 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1664 type = MLD2_CHANGE_TO_EXCLUDE; 1665 else 1666 type = MLD2_CHANGE_TO_INCLUDE; 1667 skb = add_grec(skb, pmc, type, 0, 0); 1668 } 1669 spin_unlock_bh(&pmc->mca_lock); 1670 } 1671 read_unlock_bh(&idev->lock); 1672 if (!skb) 1673 return; 1674 (void) mld_sendpack(skb); 1675 } 1676 1677 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1678 { 1679 struct sock *sk = igmp6_socket->sk; 1680 struct inet6_dev *idev; 1681 struct sk_buff *skb; 1682 struct icmp6hdr *hdr; 1683 struct in6_addr *snd_addr; 1684 struct in6_addr *addrp; 1685 struct in6_addr addr_buf; 1686 struct in6_addr all_routers; 1687 int err, len, payload_len, full_len; 1688 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1689 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1690 IPV6_TLV_PADN, 0 }; 1691 1692 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1693 snd_addr = addr; 1694 if (type == ICMPV6_MGM_REDUCTION) { 1695 snd_addr = &all_routers; 1696 ipv6_addr_all_routers(&all_routers); 1697 } 1698 1699 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1700 payload_len = len + sizeof(ra); 1701 full_len = sizeof(struct ipv6hdr) + payload_len; 1702 1703 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1704 1705 if (skb == NULL) { 1706 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1707 return; 1708 } 1709 1710 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1711 1712 if (ipv6_get_lladdr(dev, &addr_buf)) { 1713 /* <draft-ietf-magma-mld-source-05.txt>: 1714 * use unspecified address as the source address 1715 * when a valid link-local address is not available. 1716 */ 1717 memset(&addr_buf, 0, sizeof(addr_buf)); 1718 } 1719 1720 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1721 1722 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1723 1724 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1725 memset(hdr, 0, sizeof(struct icmp6hdr)); 1726 hdr->icmp6_type = type; 1727 1728 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1729 ipv6_addr_copy(addrp, addr); 1730 1731 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1732 IPPROTO_ICMPV6, 1733 csum_partial((__u8 *) hdr, len, 0)); 1734 1735 idev = in6_dev_get(skb->dev); 1736 1737 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1738 mld_dev_queue_xmit); 1739 if (!err) { 1740 if (type == ICMPV6_MGM_REDUCTION) 1741 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); 1742 else 1743 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); 1744 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1745 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1746 } else 1747 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1748 1749 if (likely(idev != NULL)) 1750 in6_dev_put(idev); 1751 return; 1752 } 1753 1754 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1755 struct in6_addr *psfsrc) 1756 { 1757 struct ip6_sf_list *psf, *psf_prev; 1758 int rv = 0; 1759 1760 psf_prev = NULL; 1761 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1762 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1763 break; 1764 psf_prev = psf; 1765 } 1766 if (!psf || psf->sf_count[sfmode] == 0) { 1767 /* source filter not found, or count wrong => bug */ 1768 return -ESRCH; 1769 } 1770 psf->sf_count[sfmode]--; 1771 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1772 struct inet6_dev *idev = pmc->idev; 1773 1774 /* no more filters for this source */ 1775 if (psf_prev) 1776 psf_prev->sf_next = psf->sf_next; 1777 else 1778 pmc->mca_sources = psf->sf_next; 1779 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1780 !MLD_V1_SEEN(idev)) { 1781 psf->sf_crcount = idev->mc_qrv; 1782 psf->sf_next = pmc->mca_tomb; 1783 pmc->mca_tomb = psf; 1784 rv = 1; 1785 } else 1786 kfree(psf); 1787 } 1788 return rv; 1789 } 1790 1791 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1792 int sfmode, int sfcount, struct in6_addr *psfsrc, 1793 int delta) 1794 { 1795 struct ifmcaddr6 *pmc; 1796 int changerec = 0; 1797 int i, err; 1798 1799 if (!idev) 1800 return -ENODEV; 1801 read_lock_bh(&idev->lock); 1802 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1803 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1804 break; 1805 } 1806 if (!pmc) { 1807 /* MCA not found?? bug */ 1808 read_unlock_bh(&idev->lock); 1809 return -ESRCH; 1810 } 1811 spin_lock_bh(&pmc->mca_lock); 1812 sf_markstate(pmc); 1813 if (!delta) { 1814 if (!pmc->mca_sfcount[sfmode]) { 1815 spin_unlock_bh(&pmc->mca_lock); 1816 read_unlock_bh(&idev->lock); 1817 return -EINVAL; 1818 } 1819 pmc->mca_sfcount[sfmode]--; 1820 } 1821 err = 0; 1822 for (i=0; i<sfcount; i++) { 1823 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1824 1825 changerec |= rv > 0; 1826 if (!err && rv < 0) 1827 err = rv; 1828 } 1829 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1830 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1831 pmc->mca_sfcount[MCAST_INCLUDE]) { 1832 struct ip6_sf_list *psf; 1833 1834 /* filter mode change */ 1835 pmc->mca_sfmode = MCAST_INCLUDE; 1836 pmc->mca_crcount = idev->mc_qrv; 1837 idev->mc_ifc_count = pmc->mca_crcount; 1838 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1839 psf->sf_crcount = 0; 1840 mld_ifc_event(pmc->idev); 1841 } else if (sf_setstate(pmc) || changerec) 1842 mld_ifc_event(pmc->idev); 1843 spin_unlock_bh(&pmc->mca_lock); 1844 read_unlock_bh(&idev->lock); 1845 return err; 1846 } 1847 1848 /* 1849 * Add multicast single-source filter to the interface list 1850 */ 1851 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1852 struct in6_addr *psfsrc, int delta) 1853 { 1854 struct ip6_sf_list *psf, *psf_prev; 1855 1856 psf_prev = NULL; 1857 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1858 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1859 break; 1860 psf_prev = psf; 1861 } 1862 if (!psf) { 1863 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); 1864 if (!psf) 1865 return -ENOBUFS; 1866 memset(psf, 0, sizeof(*psf)); 1867 psf->sf_addr = *psfsrc; 1868 if (psf_prev) { 1869 psf_prev->sf_next = psf; 1870 } else 1871 pmc->mca_sources = psf; 1872 } 1873 psf->sf_count[sfmode]++; 1874 return 0; 1875 } 1876 1877 static void sf_markstate(struct ifmcaddr6 *pmc) 1878 { 1879 struct ip6_sf_list *psf; 1880 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1881 1882 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1883 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1884 psf->sf_oldin = mca_xcount == 1885 psf->sf_count[MCAST_EXCLUDE] && 1886 !psf->sf_count[MCAST_INCLUDE]; 1887 } else 1888 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1889 } 1890 1891 static int sf_setstate(struct ifmcaddr6 *pmc) 1892 { 1893 struct ip6_sf_list *psf; 1894 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1895 int qrv = pmc->idev->mc_qrv; 1896 int new_in, rv; 1897 1898 rv = 0; 1899 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1900 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1901 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1902 !psf->sf_count[MCAST_INCLUDE]; 1903 } else 1904 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1905 if (new_in != psf->sf_oldin) { 1906 psf->sf_crcount = qrv; 1907 rv++; 1908 } 1909 } 1910 return rv; 1911 } 1912 1913 /* 1914 * Add multicast source filter list to the interface list 1915 */ 1916 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 1917 int sfmode, int sfcount, struct in6_addr *psfsrc, 1918 int delta) 1919 { 1920 struct ifmcaddr6 *pmc; 1921 int isexclude; 1922 int i, err; 1923 1924 if (!idev) 1925 return -ENODEV; 1926 read_lock_bh(&idev->lock); 1927 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1928 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1929 break; 1930 } 1931 if (!pmc) { 1932 /* MCA not found?? bug */ 1933 read_unlock_bh(&idev->lock); 1934 return -ESRCH; 1935 } 1936 spin_lock_bh(&pmc->mca_lock); 1937 1938 sf_markstate(pmc); 1939 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 1940 if (!delta) 1941 pmc->mca_sfcount[sfmode]++; 1942 err = 0; 1943 for (i=0; i<sfcount; i++) { 1944 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1945 if (err) 1946 break; 1947 } 1948 if (err) { 1949 int j; 1950 1951 if (!delta) 1952 pmc->mca_sfcount[sfmode]--; 1953 for (j=0; j<i; j++) 1954 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1955 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 1956 struct inet6_dev *idev = pmc->idev; 1957 struct ip6_sf_list *psf; 1958 1959 /* filter mode change */ 1960 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1961 pmc->mca_sfmode = MCAST_EXCLUDE; 1962 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 1963 pmc->mca_sfmode = MCAST_INCLUDE; 1964 /* else no filters; keep old mode for reports */ 1965 1966 pmc->mca_crcount = idev->mc_qrv; 1967 idev->mc_ifc_count = pmc->mca_crcount; 1968 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1969 psf->sf_crcount = 0; 1970 mld_ifc_event(idev); 1971 } else if (sf_setstate(pmc)) 1972 mld_ifc_event(idev); 1973 spin_unlock_bh(&pmc->mca_lock); 1974 read_unlock_bh(&idev->lock); 1975 return err; 1976 } 1977 1978 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 1979 { 1980 struct ip6_sf_list *psf, *nextpsf; 1981 1982 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 1983 nextpsf = psf->sf_next; 1984 kfree(psf); 1985 } 1986 pmc->mca_tomb = NULL; 1987 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 1988 nextpsf = psf->sf_next; 1989 kfree(psf); 1990 } 1991 pmc->mca_sources = NULL; 1992 pmc->mca_sfmode = MCAST_EXCLUDE; 1993 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 1994 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 1995 } 1996 1997 1998 static void igmp6_join_group(struct ifmcaddr6 *ma) 1999 { 2000 unsigned long delay; 2001 2002 if (ma->mca_flags & MAF_NOREPORT) 2003 return; 2004 2005 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2006 2007 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2008 2009 spin_lock_bh(&ma->mca_lock); 2010 if (del_timer(&ma->mca_timer)) { 2011 atomic_dec(&ma->mca_refcnt); 2012 delay = ma->mca_timer.expires - jiffies; 2013 } 2014 2015 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2016 atomic_inc(&ma->mca_refcnt); 2017 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2018 spin_unlock_bh(&ma->mca_lock); 2019 } 2020 2021 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2022 struct inet6_dev *idev) 2023 { 2024 int err; 2025 2026 if (iml->sflist == 0) { 2027 /* any-source empty exclude case */ 2028 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2029 } 2030 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2031 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2032 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2033 iml->sflist = NULL; 2034 return err; 2035 } 2036 2037 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2038 { 2039 if (MLD_V1_SEEN(ma->idev)) { 2040 if (ma->mca_flags & MAF_LAST_REPORTER) 2041 igmp6_send(&ma->mca_addr, ma->idev->dev, 2042 ICMPV6_MGM_REDUCTION); 2043 } else { 2044 mld_add_delrec(ma->idev, ma); 2045 mld_ifc_event(ma->idev); 2046 } 2047 } 2048 2049 static void mld_gq_timer_expire(unsigned long data) 2050 { 2051 struct inet6_dev *idev = (struct inet6_dev *)data; 2052 2053 idev->mc_gq_running = 0; 2054 mld_send_report(idev, NULL); 2055 __in6_dev_put(idev); 2056 } 2057 2058 static void mld_ifc_timer_expire(unsigned long data) 2059 { 2060 struct inet6_dev *idev = (struct inet6_dev *)data; 2061 2062 mld_send_cr(idev); 2063 if (idev->mc_ifc_count) { 2064 idev->mc_ifc_count--; 2065 if (idev->mc_ifc_count) 2066 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2067 } 2068 __in6_dev_put(idev); 2069 } 2070 2071 static void mld_ifc_event(struct inet6_dev *idev) 2072 { 2073 if (MLD_V1_SEEN(idev)) 2074 return; 2075 idev->mc_ifc_count = idev->mc_qrv; 2076 mld_ifc_start_timer(idev, 1); 2077 } 2078 2079 2080 static void igmp6_timer_handler(unsigned long data) 2081 { 2082 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2083 2084 if (MLD_V1_SEEN(ma->idev)) 2085 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2086 else 2087 mld_send_report(ma->idev, ma); 2088 2089 spin_lock(&ma->mca_lock); 2090 ma->mca_flags |= MAF_LAST_REPORTER; 2091 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2092 spin_unlock(&ma->mca_lock); 2093 ma_put(ma); 2094 } 2095 2096 /* Device going down */ 2097 2098 void ipv6_mc_down(struct inet6_dev *idev) 2099 { 2100 struct ifmcaddr6 *i; 2101 2102 /* Withdraw multicast list */ 2103 2104 read_lock_bh(&idev->lock); 2105 idev->mc_ifc_count = 0; 2106 if (del_timer(&idev->mc_ifc_timer)) 2107 __in6_dev_put(idev); 2108 idev->mc_gq_running = 0; 2109 if (del_timer(&idev->mc_gq_timer)) 2110 __in6_dev_put(idev); 2111 2112 for (i = idev->mc_list; i; i=i->next) 2113 igmp6_group_dropped(i); 2114 read_unlock_bh(&idev->lock); 2115 2116 mld_clear_delrec(idev); 2117 } 2118 2119 2120 /* Device going up */ 2121 2122 void ipv6_mc_up(struct inet6_dev *idev) 2123 { 2124 struct ifmcaddr6 *i; 2125 2126 /* Install multicast list, except for all-nodes (already installed) */ 2127 2128 read_lock_bh(&idev->lock); 2129 for (i = idev->mc_list; i; i=i->next) 2130 igmp6_group_added(i); 2131 read_unlock_bh(&idev->lock); 2132 } 2133 2134 /* IPv6 device initialization. */ 2135 2136 void ipv6_mc_init_dev(struct inet6_dev *idev) 2137 { 2138 struct in6_addr maddr; 2139 2140 write_lock_bh(&idev->lock); 2141 rwlock_init(&idev->mc_lock); 2142 idev->mc_gq_running = 0; 2143 init_timer(&idev->mc_gq_timer); 2144 idev->mc_gq_timer.data = (unsigned long) idev; 2145 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2146 idev->mc_tomb = NULL; 2147 idev->mc_ifc_count = 0; 2148 init_timer(&idev->mc_ifc_timer); 2149 idev->mc_ifc_timer.data = (unsigned long) idev; 2150 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2151 idev->mc_qrv = MLD_QRV_DEFAULT; 2152 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2153 idev->mc_v1_seen = 0; 2154 write_unlock_bh(&idev->lock); 2155 2156 /* Add all-nodes address. */ 2157 ipv6_addr_all_nodes(&maddr); 2158 ipv6_dev_mc_inc(idev->dev, &maddr); 2159 } 2160 2161 /* 2162 * Device is about to be destroyed: clean up. 2163 */ 2164 2165 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2166 { 2167 struct ifmcaddr6 *i; 2168 struct in6_addr maddr; 2169 2170 /* Deactivate timers */ 2171 ipv6_mc_down(idev); 2172 2173 /* Delete all-nodes address. */ 2174 ipv6_addr_all_nodes(&maddr); 2175 2176 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2177 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2178 * fail. 2179 */ 2180 __ipv6_dev_mc_dec(idev, &maddr); 2181 2182 if (idev->cnf.forwarding) { 2183 ipv6_addr_all_routers(&maddr); 2184 __ipv6_dev_mc_dec(idev, &maddr); 2185 } 2186 2187 write_lock_bh(&idev->lock); 2188 while ((i = idev->mc_list) != NULL) { 2189 idev->mc_list = i->next; 2190 write_unlock_bh(&idev->lock); 2191 2192 igmp6_group_dropped(i); 2193 ma_put(i); 2194 2195 write_lock_bh(&idev->lock); 2196 } 2197 write_unlock_bh(&idev->lock); 2198 } 2199 2200 #ifdef CONFIG_PROC_FS 2201 struct igmp6_mc_iter_state { 2202 struct net_device *dev; 2203 struct inet6_dev *idev; 2204 }; 2205 2206 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2207 2208 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2209 { 2210 struct ifmcaddr6 *im = NULL; 2211 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2212 2213 for (state->dev = dev_base, state->idev = NULL; 2214 state->dev; 2215 state->dev = state->dev->next) { 2216 struct inet6_dev *idev; 2217 idev = in6_dev_get(state->dev); 2218 if (!idev) 2219 continue; 2220 read_lock_bh(&idev->lock); 2221 im = idev->mc_list; 2222 if (im) { 2223 state->idev = idev; 2224 break; 2225 } 2226 read_unlock_bh(&idev->lock); 2227 in6_dev_put(idev); 2228 } 2229 return im; 2230 } 2231 2232 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2233 { 2234 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2235 2236 im = im->next; 2237 while (!im) { 2238 if (likely(state->idev != NULL)) { 2239 read_unlock_bh(&state->idev->lock); 2240 in6_dev_put(state->idev); 2241 } 2242 state->dev = state->dev->next; 2243 if (!state->dev) { 2244 state->idev = NULL; 2245 break; 2246 } 2247 state->idev = in6_dev_get(state->dev); 2248 if (!state->idev) 2249 continue; 2250 read_lock_bh(&state->idev->lock); 2251 im = state->idev->mc_list; 2252 } 2253 return im; 2254 } 2255 2256 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2257 { 2258 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2259 if (im) 2260 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2261 --pos; 2262 return pos ? NULL : im; 2263 } 2264 2265 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2266 { 2267 read_lock(&dev_base_lock); 2268 return igmp6_mc_get_idx(seq, *pos); 2269 } 2270 2271 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2272 { 2273 struct ifmcaddr6 *im; 2274 im = igmp6_mc_get_next(seq, v); 2275 ++*pos; 2276 return im; 2277 } 2278 2279 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2280 { 2281 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2282 if (likely(state->idev != NULL)) { 2283 read_unlock_bh(&state->idev->lock); 2284 in6_dev_put(state->idev); 2285 state->idev = NULL; 2286 } 2287 state->dev = NULL; 2288 read_unlock(&dev_base_lock); 2289 } 2290 2291 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2292 { 2293 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2294 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2295 2296 seq_printf(seq, 2297 "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n", 2298 state->dev->ifindex, state->dev->name, 2299 NIP6(im->mca_addr), 2300 im->mca_users, im->mca_flags, 2301 (im->mca_flags&MAF_TIMER_RUNNING) ? 2302 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2303 return 0; 2304 } 2305 2306 static struct seq_operations igmp6_mc_seq_ops = { 2307 .start = igmp6_mc_seq_start, 2308 .next = igmp6_mc_seq_next, 2309 .stop = igmp6_mc_seq_stop, 2310 .show = igmp6_mc_seq_show, 2311 }; 2312 2313 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2314 { 2315 struct seq_file *seq; 2316 int rc = -ENOMEM; 2317 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2318 2319 if (!s) 2320 goto out; 2321 2322 rc = seq_open(file, &igmp6_mc_seq_ops); 2323 if (rc) 2324 goto out_kfree; 2325 2326 seq = file->private_data; 2327 seq->private = s; 2328 memset(s, 0, sizeof(*s)); 2329 out: 2330 return rc; 2331 out_kfree: 2332 kfree(s); 2333 goto out; 2334 } 2335 2336 static struct file_operations igmp6_mc_seq_fops = { 2337 .owner = THIS_MODULE, 2338 .open = igmp6_mc_seq_open, 2339 .read = seq_read, 2340 .llseek = seq_lseek, 2341 .release = seq_release_private, 2342 }; 2343 2344 struct igmp6_mcf_iter_state { 2345 struct net_device *dev; 2346 struct inet6_dev *idev; 2347 struct ifmcaddr6 *im; 2348 }; 2349 2350 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2351 2352 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2353 { 2354 struct ip6_sf_list *psf = NULL; 2355 struct ifmcaddr6 *im = NULL; 2356 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2357 2358 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2359 state->dev; 2360 state->dev = state->dev->next) { 2361 struct inet6_dev *idev; 2362 idev = in6_dev_get(state->dev); 2363 if (unlikely(idev == NULL)) 2364 continue; 2365 read_lock_bh(&idev->lock); 2366 im = idev->mc_list; 2367 if (likely(im != NULL)) { 2368 spin_lock_bh(&im->mca_lock); 2369 psf = im->mca_sources; 2370 if (likely(psf != NULL)) { 2371 state->im = im; 2372 state->idev = idev; 2373 break; 2374 } 2375 spin_unlock_bh(&im->mca_lock); 2376 } 2377 read_unlock_bh(&idev->lock); 2378 in6_dev_put(idev); 2379 } 2380 return psf; 2381 } 2382 2383 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2384 { 2385 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2386 2387 psf = psf->sf_next; 2388 while (!psf) { 2389 spin_unlock_bh(&state->im->mca_lock); 2390 state->im = state->im->next; 2391 while (!state->im) { 2392 if (likely(state->idev != NULL)) { 2393 read_unlock_bh(&state->idev->lock); 2394 in6_dev_put(state->idev); 2395 } 2396 state->dev = state->dev->next; 2397 if (!state->dev) { 2398 state->idev = NULL; 2399 goto out; 2400 } 2401 state->idev = in6_dev_get(state->dev); 2402 if (!state->idev) 2403 continue; 2404 read_lock_bh(&state->idev->lock); 2405 state->im = state->idev->mc_list; 2406 } 2407 if (!state->im) 2408 break; 2409 spin_lock_bh(&state->im->mca_lock); 2410 psf = state->im->mca_sources; 2411 } 2412 out: 2413 return psf; 2414 } 2415 2416 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2417 { 2418 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2419 if (psf) 2420 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2421 --pos; 2422 return pos ? NULL : psf; 2423 } 2424 2425 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2426 { 2427 read_lock(&dev_base_lock); 2428 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2429 } 2430 2431 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2432 { 2433 struct ip6_sf_list *psf; 2434 if (v == SEQ_START_TOKEN) 2435 psf = igmp6_mcf_get_first(seq); 2436 else 2437 psf = igmp6_mcf_get_next(seq, v); 2438 ++*pos; 2439 return psf; 2440 } 2441 2442 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2443 { 2444 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2445 if (likely(state->im != NULL)) { 2446 spin_unlock_bh(&state->im->mca_lock); 2447 state->im = NULL; 2448 } 2449 if (likely(state->idev != NULL)) { 2450 read_unlock_bh(&state->idev->lock); 2451 in6_dev_put(state->idev); 2452 state->idev = NULL; 2453 } 2454 state->dev = NULL; 2455 read_unlock(&dev_base_lock); 2456 } 2457 2458 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2459 { 2460 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2461 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2462 2463 if (v == SEQ_START_TOKEN) { 2464 seq_printf(seq, 2465 "%3s %6s " 2466 "%32s %32s %6s %6s\n", "Idx", 2467 "Device", "Multicast Address", 2468 "Source Address", "INC", "EXC"); 2469 } else { 2470 seq_printf(seq, 2471 "%3d %6.6s " 2472 "%04x%04x%04x%04x%04x%04x%04x%04x " 2473 "%04x%04x%04x%04x%04x%04x%04x%04x " 2474 "%6lu %6lu\n", 2475 state->dev->ifindex, state->dev->name, 2476 NIP6(state->im->mca_addr), 2477 NIP6(psf->sf_addr), 2478 psf->sf_count[MCAST_INCLUDE], 2479 psf->sf_count[MCAST_EXCLUDE]); 2480 } 2481 return 0; 2482 } 2483 2484 static struct seq_operations igmp6_mcf_seq_ops = { 2485 .start = igmp6_mcf_seq_start, 2486 .next = igmp6_mcf_seq_next, 2487 .stop = igmp6_mcf_seq_stop, 2488 .show = igmp6_mcf_seq_show, 2489 }; 2490 2491 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2492 { 2493 struct seq_file *seq; 2494 int rc = -ENOMEM; 2495 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2496 2497 if (!s) 2498 goto out; 2499 2500 rc = seq_open(file, &igmp6_mcf_seq_ops); 2501 if (rc) 2502 goto out_kfree; 2503 2504 seq = file->private_data; 2505 seq->private = s; 2506 memset(s, 0, sizeof(*s)); 2507 out: 2508 return rc; 2509 out_kfree: 2510 kfree(s); 2511 goto out; 2512 } 2513 2514 static struct file_operations igmp6_mcf_seq_fops = { 2515 .owner = THIS_MODULE, 2516 .open = igmp6_mcf_seq_open, 2517 .read = seq_read, 2518 .llseek = seq_lseek, 2519 .release = seq_release_private, 2520 }; 2521 #endif 2522 2523 int __init igmp6_init(struct net_proto_family *ops) 2524 { 2525 struct ipv6_pinfo *np; 2526 struct sock *sk; 2527 int err; 2528 2529 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2530 if (err < 0) { 2531 printk(KERN_ERR 2532 "Failed to initialize the IGMP6 control socket (err %d).\n", 2533 err); 2534 igmp6_socket = NULL; /* For safety. */ 2535 return err; 2536 } 2537 2538 sk = igmp6_socket->sk; 2539 sk->sk_allocation = GFP_ATOMIC; 2540 sk->sk_prot->unhash(sk); 2541 2542 np = inet6_sk(sk); 2543 np->hop_limit = 1; 2544 2545 #ifdef CONFIG_PROC_FS 2546 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2547 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2548 #endif 2549 2550 return 0; 2551 } 2552 2553 void igmp6_cleanup(void) 2554 { 2555 sock_release(igmp6_socket); 2556 igmp6_socket = NULL; /* for safety */ 2557 2558 #ifdef CONFIG_PROC_FS 2559 proc_net_remove("mcfilter6"); 2560 proc_net_remove("igmp6"); 2561 #endif 2562 } 2563