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