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 if (!pskb_may_pull(skb, sizeof(struct in6_addr))) 1235 return -EINVAL; 1236 1237 hdr = (struct icmp6hdr*) skb->h.raw; 1238 1239 /* Drop reports with not link local source */ 1240 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); 1241 if (addr_type != IPV6_ADDR_ANY && 1242 !(addr_type&IPV6_ADDR_LINKLOCAL)) 1243 return -EINVAL; 1244 1245 addrp = (struct in6_addr *) (hdr + 1); 1246 1247 idev = in6_dev_get(skb->dev); 1248 if (idev == NULL) 1249 return -ENODEV; 1250 1251 /* 1252 * Cancel the timer for this group 1253 */ 1254 1255 read_lock_bh(&idev->lock); 1256 for (ma = idev->mc_list; ma; ma=ma->next) { 1257 if (ipv6_addr_equal(&ma->mca_addr, addrp)) { 1258 spin_lock(&ma->mca_lock); 1259 if (del_timer(&ma->mca_timer)) 1260 atomic_dec(&ma->mca_refcnt); 1261 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); 1262 spin_unlock(&ma->mca_lock); 1263 break; 1264 } 1265 } 1266 read_unlock_bh(&idev->lock); 1267 in6_dev_put(idev); 1268 return 0; 1269 } 1270 1271 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, 1272 int gdeleted, int sdeleted) 1273 { 1274 switch (type) { 1275 case MLD2_MODE_IS_INCLUDE: 1276 case MLD2_MODE_IS_EXCLUDE: 1277 if (gdeleted || sdeleted) 1278 return 0; 1279 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp); 1280 case MLD2_CHANGE_TO_INCLUDE: 1281 if (gdeleted || sdeleted) 1282 return 0; 1283 return psf->sf_count[MCAST_INCLUDE] != 0; 1284 case MLD2_CHANGE_TO_EXCLUDE: 1285 if (gdeleted || sdeleted) 1286 return 0; 1287 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || 1288 psf->sf_count[MCAST_INCLUDE]) 1289 return 0; 1290 return pmc->mca_sfcount[MCAST_EXCLUDE] == 1291 psf->sf_count[MCAST_EXCLUDE]; 1292 case MLD2_ALLOW_NEW_SOURCES: 1293 if (gdeleted || !psf->sf_crcount) 1294 return 0; 1295 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; 1296 case MLD2_BLOCK_OLD_SOURCES: 1297 if (pmc->mca_sfmode == MCAST_INCLUDE) 1298 return gdeleted || (psf->sf_crcount && sdeleted); 1299 return psf->sf_crcount && !gdeleted && !sdeleted; 1300 } 1301 return 0; 1302 } 1303 1304 static int 1305 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) 1306 { 1307 struct ip6_sf_list *psf; 1308 int scount = 0; 1309 1310 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1311 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 1312 continue; 1313 scount++; 1314 } 1315 return scount; 1316 } 1317 1318 static struct sk_buff *mld_newpack(struct net_device *dev, int size) 1319 { 1320 struct sock *sk = igmp6_socket->sk; 1321 struct sk_buff *skb; 1322 struct mld2_report *pmr; 1323 struct in6_addr addr_buf; 1324 int err; 1325 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1326 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1327 IPV6_TLV_PADN, 0 }; 1328 1329 /* we assume size > sizeof(ra) here */ 1330 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); 1331 1332 if (skb == 0) 1333 return NULL; 1334 1335 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1336 1337 if (ipv6_get_lladdr(dev, &addr_buf)) { 1338 /* <draft-ietf-magma-mld-source-05.txt>: 1339 * use unspecified address as the source address 1340 * when a valid link-local address is not available. 1341 */ 1342 memset(&addr_buf, 0, sizeof(addr_buf)); 1343 } 1344 1345 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); 1346 1347 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1348 1349 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); 1350 skb->h.raw = (unsigned char *)pmr; 1351 pmr->type = ICMPV6_MLD2_REPORT; 1352 pmr->resv1 = 0; 1353 pmr->csum = 0; 1354 pmr->resv2 = 0; 1355 pmr->ngrec = 0; 1356 return skb; 1357 } 1358 1359 static inline int mld_dev_queue_xmit2(struct sk_buff *skb) 1360 { 1361 struct net_device *dev = skb->dev; 1362 1363 if (dev->hard_header) { 1364 unsigned char ha[MAX_ADDR_LEN]; 1365 int err; 1366 1367 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1); 1368 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); 1369 if (err < 0) { 1370 kfree_skb(skb); 1371 return err; 1372 } 1373 } 1374 return dev_queue_xmit(skb); 1375 } 1376 1377 static inline int mld_dev_queue_xmit(struct sk_buff *skb) 1378 { 1379 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, 1380 mld_dev_queue_xmit2); 1381 } 1382 1383 static void mld_sendpack(struct sk_buff *skb) 1384 { 1385 struct ipv6hdr *pip6 = skb->nh.ipv6h; 1386 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; 1387 int payload_len, mldlen; 1388 struct inet6_dev *idev = in6_dev_get(skb->dev); 1389 int err; 1390 1391 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1392 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - 1393 sizeof(struct ipv6hdr); 1394 mldlen = skb->tail - skb->h.raw; 1395 pip6->payload_len = htons(payload_len); 1396 1397 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, 1398 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); 1399 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1400 mld_dev_queue_xmit); 1401 if (!err) { 1402 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); 1403 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1404 } else 1405 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1406 1407 if (likely(idev != NULL)) 1408 in6_dev_put(idev); 1409 } 1410 1411 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) 1412 { 1413 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); 1414 } 1415 1416 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1417 int type, struct mld2_grec **ppgr) 1418 { 1419 struct net_device *dev = pmc->idev->dev; 1420 struct mld2_report *pmr; 1421 struct mld2_grec *pgr; 1422 1423 if (!skb) 1424 skb = mld_newpack(dev, dev->mtu); 1425 if (!skb) 1426 return NULL; 1427 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); 1428 pgr->grec_type = type; 1429 pgr->grec_auxwords = 0; 1430 pgr->grec_nsrcs = 0; 1431 pgr->grec_mca = pmc->mca_addr; /* structure copy */ 1432 pmr = (struct mld2_report *)skb->h.raw; 1433 pmr->ngrec = htons(ntohs(pmr->ngrec)+1); 1434 *ppgr = pgr; 1435 return skb; 1436 } 1437 1438 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 1439 skb_tailroom(skb)) : 0) 1440 1441 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, 1442 int type, int gdeleted, int sdeleted) 1443 { 1444 struct net_device *dev = pmc->idev->dev; 1445 struct mld2_report *pmr; 1446 struct mld2_grec *pgr = NULL; 1447 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; 1448 int scount, first, isquery, truncate; 1449 1450 if (pmc->mca_flags & MAF_NOREPORT) 1451 return skb; 1452 1453 isquery = type == MLD2_MODE_IS_INCLUDE || 1454 type == MLD2_MODE_IS_EXCLUDE; 1455 truncate = type == MLD2_MODE_IS_EXCLUDE || 1456 type == MLD2_CHANGE_TO_EXCLUDE; 1457 1458 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; 1459 1460 if (!*psf_list) { 1461 if (type == MLD2_ALLOW_NEW_SOURCES || 1462 type == MLD2_BLOCK_OLD_SOURCES) 1463 return skb; 1464 if (pmc->mca_crcount || isquery) { 1465 /* make sure we have room for group header and at 1466 * least one source. 1467 */ 1468 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+ 1469 sizeof(struct in6_addr)) { 1470 mld_sendpack(skb); 1471 skb = NULL; /* add_grhead will get a new one */ 1472 } 1473 skb = add_grhead(skb, pmc, type, &pgr); 1474 } 1475 return skb; 1476 } 1477 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; 1478 1479 /* EX and TO_EX get a fresh packet, if needed */ 1480 if (truncate) { 1481 if (pmr && pmr->ngrec && 1482 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 1483 if (skb) 1484 mld_sendpack(skb); 1485 skb = mld_newpack(dev, dev->mtu); 1486 } 1487 } 1488 first = 1; 1489 scount = 0; 1490 psf_prev = NULL; 1491 for (psf=*psf_list; psf; psf=psf_next) { 1492 struct in6_addr *psrc; 1493 1494 psf_next = psf->sf_next; 1495 1496 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 1497 psf_prev = psf; 1498 continue; 1499 } 1500 1501 /* clear marks on query responses */ 1502 if (isquery) 1503 psf->sf_gsresp = 0; 1504 1505 if (AVAILABLE(skb) < sizeof(*psrc) + 1506 first*sizeof(struct mld2_grec)) { 1507 if (truncate && !first) 1508 break; /* truncate these */ 1509 if (pgr) 1510 pgr->grec_nsrcs = htons(scount); 1511 if (skb) 1512 mld_sendpack(skb); 1513 skb = mld_newpack(dev, dev->mtu); 1514 first = 1; 1515 scount = 0; 1516 } 1517 if (first) { 1518 skb = add_grhead(skb, pmc, type, &pgr); 1519 first = 0; 1520 } 1521 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); 1522 *psrc = psf->sf_addr; 1523 scount++; 1524 if ((type == MLD2_ALLOW_NEW_SOURCES || 1525 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 1526 psf->sf_crcount--; 1527 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 1528 if (psf_prev) 1529 psf_prev->sf_next = psf->sf_next; 1530 else 1531 *psf_list = psf->sf_next; 1532 kfree(psf); 1533 continue; 1534 } 1535 } 1536 psf_prev = psf; 1537 } 1538 if (pgr) 1539 pgr->grec_nsrcs = htons(scount); 1540 1541 if (isquery) 1542 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ 1543 return skb; 1544 } 1545 1546 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) 1547 { 1548 struct sk_buff *skb = NULL; 1549 int type; 1550 1551 if (!pmc) { 1552 read_lock_bh(&idev->lock); 1553 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1554 if (pmc->mca_flags & MAF_NOREPORT) 1555 continue; 1556 spin_lock_bh(&pmc->mca_lock); 1557 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1558 type = MLD2_MODE_IS_EXCLUDE; 1559 else 1560 type = MLD2_MODE_IS_INCLUDE; 1561 skb = add_grec(skb, pmc, type, 0, 0); 1562 spin_unlock_bh(&pmc->mca_lock); 1563 } 1564 read_unlock_bh(&idev->lock); 1565 } else { 1566 spin_lock_bh(&pmc->mca_lock); 1567 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1568 type = MLD2_MODE_IS_EXCLUDE; 1569 else 1570 type = MLD2_MODE_IS_INCLUDE; 1571 skb = add_grec(skb, pmc, type, 0, 0); 1572 spin_unlock_bh(&pmc->mca_lock); 1573 } 1574 if (skb) 1575 mld_sendpack(skb); 1576 } 1577 1578 /* 1579 * remove zero-count source records from a source filter list 1580 */ 1581 static void mld_clear_zeros(struct ip6_sf_list **ppsf) 1582 { 1583 struct ip6_sf_list *psf_prev, *psf_next, *psf; 1584 1585 psf_prev = NULL; 1586 for (psf=*ppsf; psf; psf = psf_next) { 1587 psf_next = psf->sf_next; 1588 if (psf->sf_crcount == 0) { 1589 if (psf_prev) 1590 psf_prev->sf_next = psf->sf_next; 1591 else 1592 *ppsf = psf->sf_next; 1593 kfree(psf); 1594 } else 1595 psf_prev = psf; 1596 } 1597 } 1598 1599 static void mld_send_cr(struct inet6_dev *idev) 1600 { 1601 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; 1602 struct sk_buff *skb = NULL; 1603 int type, dtype; 1604 1605 read_lock_bh(&idev->lock); 1606 write_lock_bh(&idev->mc_lock); 1607 1608 /* deleted MCA's */ 1609 pmc_prev = NULL; 1610 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { 1611 pmc_next = pmc->next; 1612 if (pmc->mca_sfmode == MCAST_INCLUDE) { 1613 type = MLD2_BLOCK_OLD_SOURCES; 1614 dtype = MLD2_BLOCK_OLD_SOURCES; 1615 skb = add_grec(skb, pmc, type, 1, 0); 1616 skb = add_grec(skb, pmc, dtype, 1, 1); 1617 } 1618 if (pmc->mca_crcount) { 1619 pmc->mca_crcount--; 1620 if (pmc->mca_sfmode == MCAST_EXCLUDE) { 1621 type = MLD2_CHANGE_TO_INCLUDE; 1622 skb = add_grec(skb, pmc, type, 1, 0); 1623 } 1624 if (pmc->mca_crcount == 0) { 1625 mld_clear_zeros(&pmc->mca_tomb); 1626 mld_clear_zeros(&pmc->mca_sources); 1627 } 1628 } 1629 if (pmc->mca_crcount == 0 && !pmc->mca_tomb && 1630 !pmc->mca_sources) { 1631 if (pmc_prev) 1632 pmc_prev->next = pmc_next; 1633 else 1634 idev->mc_tomb = pmc_next; 1635 in6_dev_put(pmc->idev); 1636 kfree(pmc); 1637 } else 1638 pmc_prev = pmc; 1639 } 1640 write_unlock_bh(&idev->mc_lock); 1641 1642 /* change recs */ 1643 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1644 spin_lock_bh(&pmc->mca_lock); 1645 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1646 type = MLD2_BLOCK_OLD_SOURCES; 1647 dtype = MLD2_ALLOW_NEW_SOURCES; 1648 } else { 1649 type = MLD2_ALLOW_NEW_SOURCES; 1650 dtype = MLD2_BLOCK_OLD_SOURCES; 1651 } 1652 skb = add_grec(skb, pmc, type, 0, 0); 1653 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 1654 1655 /* filter mode changes */ 1656 if (pmc->mca_crcount) { 1657 pmc->mca_crcount--; 1658 if (pmc->mca_sfmode == MCAST_EXCLUDE) 1659 type = MLD2_CHANGE_TO_EXCLUDE; 1660 else 1661 type = MLD2_CHANGE_TO_INCLUDE; 1662 skb = add_grec(skb, pmc, type, 0, 0); 1663 } 1664 spin_unlock_bh(&pmc->mca_lock); 1665 } 1666 read_unlock_bh(&idev->lock); 1667 if (!skb) 1668 return; 1669 (void) mld_sendpack(skb); 1670 } 1671 1672 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) 1673 { 1674 struct sock *sk = igmp6_socket->sk; 1675 struct inet6_dev *idev; 1676 struct sk_buff *skb; 1677 struct icmp6hdr *hdr; 1678 struct in6_addr *snd_addr; 1679 struct in6_addr *addrp; 1680 struct in6_addr addr_buf; 1681 struct in6_addr all_routers; 1682 int err, len, payload_len, full_len; 1683 u8 ra[8] = { IPPROTO_ICMPV6, 0, 1684 IPV6_TLV_ROUTERALERT, 2, 0, 0, 1685 IPV6_TLV_PADN, 0 }; 1686 1687 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); 1688 snd_addr = addr; 1689 if (type == ICMPV6_MGM_REDUCTION) { 1690 snd_addr = &all_routers; 1691 ipv6_addr_all_routers(&all_routers); 1692 } 1693 1694 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); 1695 payload_len = len + sizeof(ra); 1696 full_len = sizeof(struct ipv6hdr) + payload_len; 1697 1698 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); 1699 1700 if (skb == NULL) { 1701 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1702 return; 1703 } 1704 1705 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 1706 1707 if (ipv6_get_lladdr(dev, &addr_buf)) { 1708 /* <draft-ietf-magma-mld-source-05.txt>: 1709 * use unspecified address as the source address 1710 * when a valid link-local address is not available. 1711 */ 1712 memset(&addr_buf, 0, sizeof(addr_buf)); 1713 } 1714 1715 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); 1716 1717 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); 1718 1719 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); 1720 memset(hdr, 0, sizeof(struct icmp6hdr)); 1721 hdr->icmp6_type = type; 1722 1723 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); 1724 ipv6_addr_copy(addrp, addr); 1725 1726 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, 1727 IPPROTO_ICMPV6, 1728 csum_partial((__u8 *) hdr, len, 0)); 1729 1730 idev = in6_dev_get(skb->dev); 1731 1732 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, 1733 mld_dev_queue_xmit); 1734 if (!err) { 1735 if (type == ICMPV6_MGM_REDUCTION) 1736 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); 1737 else 1738 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); 1739 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); 1740 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); 1741 } else 1742 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 1743 1744 if (likely(idev != NULL)) 1745 in6_dev_put(idev); 1746 return; 1747 } 1748 1749 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, 1750 struct in6_addr *psfsrc) 1751 { 1752 struct ip6_sf_list *psf, *psf_prev; 1753 int rv = 0; 1754 1755 psf_prev = NULL; 1756 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1757 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1758 break; 1759 psf_prev = psf; 1760 } 1761 if (!psf || psf->sf_count[sfmode] == 0) { 1762 /* source filter not found, or count wrong => bug */ 1763 return -ESRCH; 1764 } 1765 psf->sf_count[sfmode]--; 1766 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1767 struct inet6_dev *idev = pmc->idev; 1768 1769 /* no more filters for this source */ 1770 if (psf_prev) 1771 psf_prev->sf_next = psf->sf_next; 1772 else 1773 pmc->mca_sources = psf->sf_next; 1774 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && 1775 !MLD_V1_SEEN(idev)) { 1776 psf->sf_crcount = idev->mc_qrv; 1777 psf->sf_next = pmc->mca_tomb; 1778 pmc->mca_tomb = psf; 1779 rv = 1; 1780 } else 1781 kfree(psf); 1782 } 1783 return rv; 1784 } 1785 1786 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, 1787 int sfmode, int sfcount, struct in6_addr *psfsrc, 1788 int delta) 1789 { 1790 struct ifmcaddr6 *pmc; 1791 int changerec = 0; 1792 int i, err; 1793 1794 if (!idev) 1795 return -ENODEV; 1796 read_lock_bh(&idev->lock); 1797 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1798 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1799 break; 1800 } 1801 if (!pmc) { 1802 /* MCA not found?? bug */ 1803 read_unlock_bh(&idev->lock); 1804 return -ESRCH; 1805 } 1806 spin_lock_bh(&pmc->mca_lock); 1807 sf_markstate(pmc); 1808 if (!delta) { 1809 if (!pmc->mca_sfcount[sfmode]) { 1810 spin_unlock_bh(&pmc->mca_lock); 1811 read_unlock_bh(&idev->lock); 1812 return -EINVAL; 1813 } 1814 pmc->mca_sfcount[sfmode]--; 1815 } 1816 err = 0; 1817 for (i=0; i<sfcount; i++) { 1818 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1819 1820 changerec |= rv > 0; 1821 if (!err && rv < 0) 1822 err = rv; 1823 } 1824 if (pmc->mca_sfmode == MCAST_EXCLUDE && 1825 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && 1826 pmc->mca_sfcount[MCAST_INCLUDE]) { 1827 struct ip6_sf_list *psf; 1828 1829 /* filter mode change */ 1830 pmc->mca_sfmode = MCAST_INCLUDE; 1831 pmc->mca_crcount = idev->mc_qrv; 1832 idev->mc_ifc_count = pmc->mca_crcount; 1833 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1834 psf->sf_crcount = 0; 1835 mld_ifc_event(pmc->idev); 1836 } else if (sf_setstate(pmc) || changerec) 1837 mld_ifc_event(pmc->idev); 1838 spin_unlock_bh(&pmc->mca_lock); 1839 read_unlock_bh(&idev->lock); 1840 return err; 1841 } 1842 1843 /* 1844 * Add multicast single-source filter to the interface list 1845 */ 1846 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, 1847 struct in6_addr *psfsrc, int delta) 1848 { 1849 struct ip6_sf_list *psf, *psf_prev; 1850 1851 psf_prev = NULL; 1852 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1853 if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) 1854 break; 1855 psf_prev = psf; 1856 } 1857 if (!psf) { 1858 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); 1859 if (!psf) 1860 return -ENOBUFS; 1861 memset(psf, 0, sizeof(*psf)); 1862 psf->sf_addr = *psfsrc; 1863 if (psf_prev) { 1864 psf_prev->sf_next = psf; 1865 } else 1866 pmc->mca_sources = psf; 1867 } 1868 psf->sf_count[sfmode]++; 1869 return 0; 1870 } 1871 1872 static void sf_markstate(struct ifmcaddr6 *pmc) 1873 { 1874 struct ip6_sf_list *psf; 1875 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1876 1877 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) 1878 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1879 psf->sf_oldin = mca_xcount == 1880 psf->sf_count[MCAST_EXCLUDE] && 1881 !psf->sf_count[MCAST_INCLUDE]; 1882 } else 1883 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1884 } 1885 1886 static int sf_setstate(struct ifmcaddr6 *pmc) 1887 { 1888 struct ip6_sf_list *psf; 1889 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; 1890 int qrv = pmc->idev->mc_qrv; 1891 int new_in, rv; 1892 1893 rv = 0; 1894 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { 1895 if (pmc->mca_sfcount[MCAST_EXCLUDE]) { 1896 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1897 !psf->sf_count[MCAST_INCLUDE]; 1898 } else 1899 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1900 if (new_in != psf->sf_oldin) { 1901 psf->sf_crcount = qrv; 1902 rv++; 1903 } 1904 } 1905 return rv; 1906 } 1907 1908 /* 1909 * Add multicast source filter list to the interface list 1910 */ 1911 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, 1912 int sfmode, int sfcount, struct in6_addr *psfsrc, 1913 int delta) 1914 { 1915 struct ifmcaddr6 *pmc; 1916 int isexclude; 1917 int i, err; 1918 1919 if (!idev) 1920 return -ENODEV; 1921 read_lock_bh(&idev->lock); 1922 for (pmc=idev->mc_list; pmc; pmc=pmc->next) { 1923 if (ipv6_addr_equal(pmca, &pmc->mca_addr)) 1924 break; 1925 } 1926 if (!pmc) { 1927 /* MCA not found?? bug */ 1928 read_unlock_bh(&idev->lock); 1929 return -ESRCH; 1930 } 1931 spin_lock_bh(&pmc->mca_lock); 1932 1933 sf_markstate(pmc); 1934 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; 1935 if (!delta) 1936 pmc->mca_sfcount[sfmode]++; 1937 err = 0; 1938 for (i=0; i<sfcount; i++) { 1939 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1940 if (err) 1941 break; 1942 } 1943 if (err) { 1944 int j; 1945 1946 if (!delta) 1947 pmc->mca_sfcount[sfmode]--; 1948 for (j=0; j<i; j++) 1949 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1950 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { 1951 struct inet6_dev *idev = pmc->idev; 1952 struct ip6_sf_list *psf; 1953 1954 /* filter mode change */ 1955 if (pmc->mca_sfcount[MCAST_EXCLUDE]) 1956 pmc->mca_sfmode = MCAST_EXCLUDE; 1957 else if (pmc->mca_sfcount[MCAST_INCLUDE]) 1958 pmc->mca_sfmode = MCAST_INCLUDE; 1959 /* else no filters; keep old mode for reports */ 1960 1961 pmc->mca_crcount = idev->mc_qrv; 1962 idev->mc_ifc_count = pmc->mca_crcount; 1963 for (psf=pmc->mca_sources; psf; psf = psf->sf_next) 1964 psf->sf_crcount = 0; 1965 mld_ifc_event(idev); 1966 } else if (sf_setstate(pmc)) 1967 mld_ifc_event(idev); 1968 spin_unlock_bh(&pmc->mca_lock); 1969 read_unlock_bh(&idev->lock); 1970 return err; 1971 } 1972 1973 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) 1974 { 1975 struct ip6_sf_list *psf, *nextpsf; 1976 1977 for (psf=pmc->mca_tomb; psf; psf=nextpsf) { 1978 nextpsf = psf->sf_next; 1979 kfree(psf); 1980 } 1981 pmc->mca_tomb = NULL; 1982 for (psf=pmc->mca_sources; psf; psf=nextpsf) { 1983 nextpsf = psf->sf_next; 1984 kfree(psf); 1985 } 1986 pmc->mca_sources = NULL; 1987 pmc->mca_sfmode = MCAST_EXCLUDE; 1988 pmc->mca_sfcount[MCAST_INCLUDE] = 0; 1989 pmc->mca_sfcount[MCAST_EXCLUDE] = 1; 1990 } 1991 1992 1993 static void igmp6_join_group(struct ifmcaddr6 *ma) 1994 { 1995 unsigned long delay; 1996 1997 if (ma->mca_flags & MAF_NOREPORT) 1998 return; 1999 2000 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2001 2002 delay = net_random() % IGMP6_UNSOLICITED_IVAL; 2003 2004 spin_lock_bh(&ma->mca_lock); 2005 if (del_timer(&ma->mca_timer)) { 2006 atomic_dec(&ma->mca_refcnt); 2007 delay = ma->mca_timer.expires - jiffies; 2008 } 2009 2010 if (!mod_timer(&ma->mca_timer, jiffies + delay)) 2011 atomic_inc(&ma->mca_refcnt); 2012 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; 2013 spin_unlock_bh(&ma->mca_lock); 2014 } 2015 2016 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, 2017 struct inet6_dev *idev) 2018 { 2019 int err; 2020 2021 if (iml->sflist == 0) { 2022 /* any-source empty exclude case */ 2023 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); 2024 } 2025 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 2026 iml->sflist->sl_count, iml->sflist->sl_addr, 0); 2027 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); 2028 iml->sflist = NULL; 2029 return err; 2030 } 2031 2032 static void igmp6_leave_group(struct ifmcaddr6 *ma) 2033 { 2034 if (MLD_V1_SEEN(ma->idev)) { 2035 if (ma->mca_flags & MAF_LAST_REPORTER) 2036 igmp6_send(&ma->mca_addr, ma->idev->dev, 2037 ICMPV6_MGM_REDUCTION); 2038 } else { 2039 mld_add_delrec(ma->idev, ma); 2040 mld_ifc_event(ma->idev); 2041 } 2042 } 2043 2044 static void mld_gq_timer_expire(unsigned long data) 2045 { 2046 struct inet6_dev *idev = (struct inet6_dev *)data; 2047 2048 idev->mc_gq_running = 0; 2049 mld_send_report(idev, NULL); 2050 __in6_dev_put(idev); 2051 } 2052 2053 static void mld_ifc_timer_expire(unsigned long data) 2054 { 2055 struct inet6_dev *idev = (struct inet6_dev *)data; 2056 2057 mld_send_cr(idev); 2058 if (idev->mc_ifc_count) { 2059 idev->mc_ifc_count--; 2060 if (idev->mc_ifc_count) 2061 mld_ifc_start_timer(idev, idev->mc_maxdelay); 2062 } 2063 __in6_dev_put(idev); 2064 } 2065 2066 static void mld_ifc_event(struct inet6_dev *idev) 2067 { 2068 if (MLD_V1_SEEN(idev)) 2069 return; 2070 idev->mc_ifc_count = idev->mc_qrv; 2071 mld_ifc_start_timer(idev, 1); 2072 } 2073 2074 2075 static void igmp6_timer_handler(unsigned long data) 2076 { 2077 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; 2078 2079 if (MLD_V1_SEEN(ma->idev)) 2080 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); 2081 else 2082 mld_send_report(ma->idev, ma); 2083 2084 spin_lock(&ma->mca_lock); 2085 ma->mca_flags |= MAF_LAST_REPORTER; 2086 ma->mca_flags &= ~MAF_TIMER_RUNNING; 2087 spin_unlock(&ma->mca_lock); 2088 ma_put(ma); 2089 } 2090 2091 /* Device going down */ 2092 2093 void ipv6_mc_down(struct inet6_dev *idev) 2094 { 2095 struct ifmcaddr6 *i; 2096 2097 /* Withdraw multicast list */ 2098 2099 read_lock_bh(&idev->lock); 2100 idev->mc_ifc_count = 0; 2101 if (del_timer(&idev->mc_ifc_timer)) 2102 __in6_dev_put(idev); 2103 idev->mc_gq_running = 0; 2104 if (del_timer(&idev->mc_gq_timer)) 2105 __in6_dev_put(idev); 2106 2107 for (i = idev->mc_list; i; i=i->next) 2108 igmp6_group_dropped(i); 2109 read_unlock_bh(&idev->lock); 2110 2111 mld_clear_delrec(idev); 2112 } 2113 2114 2115 /* Device going up */ 2116 2117 void ipv6_mc_up(struct inet6_dev *idev) 2118 { 2119 struct ifmcaddr6 *i; 2120 2121 /* Install multicast list, except for all-nodes (already installed) */ 2122 2123 read_lock_bh(&idev->lock); 2124 for (i = idev->mc_list; i; i=i->next) 2125 igmp6_group_added(i); 2126 read_unlock_bh(&idev->lock); 2127 } 2128 2129 /* IPv6 device initialization. */ 2130 2131 void ipv6_mc_init_dev(struct inet6_dev *idev) 2132 { 2133 struct in6_addr maddr; 2134 2135 write_lock_bh(&idev->lock); 2136 rwlock_init(&idev->mc_lock); 2137 idev->mc_gq_running = 0; 2138 init_timer(&idev->mc_gq_timer); 2139 idev->mc_gq_timer.data = (unsigned long) idev; 2140 idev->mc_gq_timer.function = &mld_gq_timer_expire; 2141 idev->mc_tomb = NULL; 2142 idev->mc_ifc_count = 0; 2143 init_timer(&idev->mc_ifc_timer); 2144 idev->mc_ifc_timer.data = (unsigned long) idev; 2145 idev->mc_ifc_timer.function = &mld_ifc_timer_expire; 2146 idev->mc_qrv = MLD_QRV_DEFAULT; 2147 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; 2148 idev->mc_v1_seen = 0; 2149 write_unlock_bh(&idev->lock); 2150 2151 /* Add all-nodes address. */ 2152 ipv6_addr_all_nodes(&maddr); 2153 ipv6_dev_mc_inc(idev->dev, &maddr); 2154 } 2155 2156 /* 2157 * Device is about to be destroyed: clean up. 2158 */ 2159 2160 void ipv6_mc_destroy_dev(struct inet6_dev *idev) 2161 { 2162 struct ifmcaddr6 *i; 2163 struct in6_addr maddr; 2164 2165 /* Deactivate timers */ 2166 ipv6_mc_down(idev); 2167 2168 /* Delete all-nodes address. */ 2169 ipv6_addr_all_nodes(&maddr); 2170 2171 /* We cannot call ipv6_dev_mc_dec() directly, our caller in 2172 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will 2173 * fail. 2174 */ 2175 __ipv6_dev_mc_dec(idev, &maddr); 2176 2177 if (idev->cnf.forwarding) { 2178 ipv6_addr_all_routers(&maddr); 2179 __ipv6_dev_mc_dec(idev, &maddr); 2180 } 2181 2182 write_lock_bh(&idev->lock); 2183 while ((i = idev->mc_list) != NULL) { 2184 idev->mc_list = i->next; 2185 write_unlock_bh(&idev->lock); 2186 2187 igmp6_group_dropped(i); 2188 ma_put(i); 2189 2190 write_lock_bh(&idev->lock); 2191 } 2192 write_unlock_bh(&idev->lock); 2193 } 2194 2195 #ifdef CONFIG_PROC_FS 2196 struct igmp6_mc_iter_state { 2197 struct net_device *dev; 2198 struct inet6_dev *idev; 2199 }; 2200 2201 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) 2202 2203 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) 2204 { 2205 struct ifmcaddr6 *im = NULL; 2206 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2207 2208 for (state->dev = dev_base, state->idev = NULL; 2209 state->dev; 2210 state->dev = state->dev->next) { 2211 struct inet6_dev *idev; 2212 idev = in6_dev_get(state->dev); 2213 if (!idev) 2214 continue; 2215 read_lock_bh(&idev->lock); 2216 im = idev->mc_list; 2217 if (im) { 2218 state->idev = idev; 2219 break; 2220 } 2221 read_unlock_bh(&idev->lock); 2222 in6_dev_put(idev); 2223 } 2224 return im; 2225 } 2226 2227 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) 2228 { 2229 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2230 2231 im = im->next; 2232 while (!im) { 2233 if (likely(state->idev != NULL)) { 2234 read_unlock_bh(&state->idev->lock); 2235 in6_dev_put(state->idev); 2236 } 2237 state->dev = state->dev->next; 2238 if (!state->dev) { 2239 state->idev = NULL; 2240 break; 2241 } 2242 state->idev = in6_dev_get(state->dev); 2243 if (!state->idev) 2244 continue; 2245 read_lock_bh(&state->idev->lock); 2246 im = state->idev->mc_list; 2247 } 2248 return im; 2249 } 2250 2251 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) 2252 { 2253 struct ifmcaddr6 *im = igmp6_mc_get_first(seq); 2254 if (im) 2255 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) 2256 --pos; 2257 return pos ? NULL : im; 2258 } 2259 2260 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) 2261 { 2262 read_lock(&dev_base_lock); 2263 return igmp6_mc_get_idx(seq, *pos); 2264 } 2265 2266 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2267 { 2268 struct ifmcaddr6 *im; 2269 im = igmp6_mc_get_next(seq, v); 2270 ++*pos; 2271 return im; 2272 } 2273 2274 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) 2275 { 2276 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2277 if (likely(state->idev != NULL)) { 2278 read_unlock_bh(&state->idev->lock); 2279 in6_dev_put(state->idev); 2280 state->idev = NULL; 2281 } 2282 state->dev = NULL; 2283 read_unlock(&dev_base_lock); 2284 } 2285 2286 static int igmp6_mc_seq_show(struct seq_file *seq, void *v) 2287 { 2288 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; 2289 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); 2290 2291 seq_printf(seq, 2292 "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n", 2293 state->dev->ifindex, state->dev->name, 2294 NIP6(im->mca_addr), 2295 im->mca_users, im->mca_flags, 2296 (im->mca_flags&MAF_TIMER_RUNNING) ? 2297 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); 2298 return 0; 2299 } 2300 2301 static struct seq_operations igmp6_mc_seq_ops = { 2302 .start = igmp6_mc_seq_start, 2303 .next = igmp6_mc_seq_next, 2304 .stop = igmp6_mc_seq_stop, 2305 .show = igmp6_mc_seq_show, 2306 }; 2307 2308 static int igmp6_mc_seq_open(struct inode *inode, struct file *file) 2309 { 2310 struct seq_file *seq; 2311 int rc = -ENOMEM; 2312 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2313 2314 if (!s) 2315 goto out; 2316 2317 rc = seq_open(file, &igmp6_mc_seq_ops); 2318 if (rc) 2319 goto out_kfree; 2320 2321 seq = file->private_data; 2322 seq->private = s; 2323 memset(s, 0, sizeof(*s)); 2324 out: 2325 return rc; 2326 out_kfree: 2327 kfree(s); 2328 goto out; 2329 } 2330 2331 static struct file_operations igmp6_mc_seq_fops = { 2332 .owner = THIS_MODULE, 2333 .open = igmp6_mc_seq_open, 2334 .read = seq_read, 2335 .llseek = seq_lseek, 2336 .release = seq_release_private, 2337 }; 2338 2339 struct igmp6_mcf_iter_state { 2340 struct net_device *dev; 2341 struct inet6_dev *idev; 2342 struct ifmcaddr6 *im; 2343 }; 2344 2345 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) 2346 2347 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) 2348 { 2349 struct ip6_sf_list *psf = NULL; 2350 struct ifmcaddr6 *im = NULL; 2351 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2352 2353 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2354 state->dev; 2355 state->dev = state->dev->next) { 2356 struct inet6_dev *idev; 2357 idev = in6_dev_get(state->dev); 2358 if (unlikely(idev == NULL)) 2359 continue; 2360 read_lock_bh(&idev->lock); 2361 im = idev->mc_list; 2362 if (likely(im != NULL)) { 2363 spin_lock_bh(&im->mca_lock); 2364 psf = im->mca_sources; 2365 if (likely(psf != NULL)) { 2366 state->im = im; 2367 state->idev = idev; 2368 break; 2369 } 2370 spin_unlock_bh(&im->mca_lock); 2371 } 2372 read_unlock_bh(&idev->lock); 2373 in6_dev_put(idev); 2374 } 2375 return psf; 2376 } 2377 2378 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) 2379 { 2380 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2381 2382 psf = psf->sf_next; 2383 while (!psf) { 2384 spin_unlock_bh(&state->im->mca_lock); 2385 state->im = state->im->next; 2386 while (!state->im) { 2387 if (likely(state->idev != NULL)) { 2388 read_unlock_bh(&state->idev->lock); 2389 in6_dev_put(state->idev); 2390 } 2391 state->dev = state->dev->next; 2392 if (!state->dev) { 2393 state->idev = NULL; 2394 goto out; 2395 } 2396 state->idev = in6_dev_get(state->dev); 2397 if (!state->idev) 2398 continue; 2399 read_lock_bh(&state->idev->lock); 2400 state->im = state->idev->mc_list; 2401 } 2402 if (!state->im) 2403 break; 2404 spin_lock_bh(&state->im->mca_lock); 2405 psf = state->im->mca_sources; 2406 } 2407 out: 2408 return psf; 2409 } 2410 2411 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) 2412 { 2413 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); 2414 if (psf) 2415 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) 2416 --pos; 2417 return pos ? NULL : psf; 2418 } 2419 2420 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2421 { 2422 read_lock(&dev_base_lock); 2423 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2424 } 2425 2426 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2427 { 2428 struct ip6_sf_list *psf; 2429 if (v == SEQ_START_TOKEN) 2430 psf = igmp6_mcf_get_first(seq); 2431 else 2432 psf = igmp6_mcf_get_next(seq, v); 2433 ++*pos; 2434 return psf; 2435 } 2436 2437 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) 2438 { 2439 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2440 if (likely(state->im != NULL)) { 2441 spin_unlock_bh(&state->im->mca_lock); 2442 state->im = NULL; 2443 } 2444 if (likely(state->idev != NULL)) { 2445 read_unlock_bh(&state->idev->lock); 2446 in6_dev_put(state->idev); 2447 state->idev = NULL; 2448 } 2449 state->dev = NULL; 2450 read_unlock(&dev_base_lock); 2451 } 2452 2453 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) 2454 { 2455 struct ip6_sf_list *psf = (struct ip6_sf_list *)v; 2456 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); 2457 2458 if (v == SEQ_START_TOKEN) { 2459 seq_printf(seq, 2460 "%3s %6s " 2461 "%32s %32s %6s %6s\n", "Idx", 2462 "Device", "Multicast Address", 2463 "Source Address", "INC", "EXC"); 2464 } else { 2465 seq_printf(seq, 2466 "%3d %6.6s " 2467 "%04x%04x%04x%04x%04x%04x%04x%04x " 2468 "%04x%04x%04x%04x%04x%04x%04x%04x " 2469 "%6lu %6lu\n", 2470 state->dev->ifindex, state->dev->name, 2471 NIP6(state->im->mca_addr), 2472 NIP6(psf->sf_addr), 2473 psf->sf_count[MCAST_INCLUDE], 2474 psf->sf_count[MCAST_EXCLUDE]); 2475 } 2476 return 0; 2477 } 2478 2479 static struct seq_operations igmp6_mcf_seq_ops = { 2480 .start = igmp6_mcf_seq_start, 2481 .next = igmp6_mcf_seq_next, 2482 .stop = igmp6_mcf_seq_stop, 2483 .show = igmp6_mcf_seq_show, 2484 }; 2485 2486 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) 2487 { 2488 struct seq_file *seq; 2489 int rc = -ENOMEM; 2490 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2491 2492 if (!s) 2493 goto out; 2494 2495 rc = seq_open(file, &igmp6_mcf_seq_ops); 2496 if (rc) 2497 goto out_kfree; 2498 2499 seq = file->private_data; 2500 seq->private = s; 2501 memset(s, 0, sizeof(*s)); 2502 out: 2503 return rc; 2504 out_kfree: 2505 kfree(s); 2506 goto out; 2507 } 2508 2509 static struct file_operations igmp6_mcf_seq_fops = { 2510 .owner = THIS_MODULE, 2511 .open = igmp6_mcf_seq_open, 2512 .read = seq_read, 2513 .llseek = seq_lseek, 2514 .release = seq_release_private, 2515 }; 2516 #endif 2517 2518 int __init igmp6_init(struct net_proto_family *ops) 2519 { 2520 struct ipv6_pinfo *np; 2521 struct sock *sk; 2522 int err; 2523 2524 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); 2525 if (err < 0) { 2526 printk(KERN_ERR 2527 "Failed to initialize the IGMP6 control socket (err %d).\n", 2528 err); 2529 igmp6_socket = NULL; /* For safety. */ 2530 return err; 2531 } 2532 2533 sk = igmp6_socket->sk; 2534 sk->sk_allocation = GFP_ATOMIC; 2535 sk->sk_prot->unhash(sk); 2536 2537 np = inet6_sk(sk); 2538 np->hop_limit = 1; 2539 2540 #ifdef CONFIG_PROC_FS 2541 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); 2542 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); 2543 #endif 2544 2545 return 0; 2546 } 2547 2548 void igmp6_cleanup(void) 2549 { 2550 sock_release(igmp6_socket); 2551 igmp6_socket = NULL; /* for safety */ 2552 2553 #ifdef CONFIG_PROC_FS 2554 proc_net_remove("mcfilter6"); 2555 proc_net_remove("igmp6"); 2556 #endif 2557 } 2558