1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * This code implements the IGMP protocol as defined in RFC1112. There has 5 * been a further revision of this protocol since which is now supported. 6 * 7 * If you have trouble with this module be careful what gcc you have used, 8 * the older version didn't come out right using gcc 2.5.8, the newer one 9 * seems to fall out with gcc 2.6.2. 10 * 11 * Authors: 12 * Alan Cox <alan@lxorguk.ukuu.org.uk> 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 * Fixes: 20 * 21 * Alan Cox : Added lots of __inline__ to optimise 22 * the memory usage of all the tiny little 23 * functions. 24 * Alan Cox : Dumped the header building experiment. 25 * Alan Cox : Minor tweaks ready for multicast routing 26 * and extended IGMP protocol. 27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 28 * writes utterly bogus code otherwise (sigh) 29 * fixed IGMP loopback to behave in the manner 30 * desired by mrouted, fixed the fact it has been 31 * broken since 1.3.6 and cleaned up a few minor 32 * points. 33 * 34 * Chih-Jen Chang : Tried to revise IGMP to Version 2 35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 36 * The enhancements are mainly based on Steve Deering's 37 * ipmulti-3.5 source code. 38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 40 * the mrouted version on that device. 41 * Chih-Jen Chang : Added the max_resp_time parameter to 42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 43 * to identify the multicast router version 44 * and do what the IGMP version 2 specified. 45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 46 * Tsu-Sheng Tsao if the specified time expired. 47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 48 * Alan Cox : Use GFP_ATOMIC in the right places. 49 * Christian Daudt : igmp timer wasn't set for local group 50 * memberships but was being deleted, 51 * which caused a "del_timer() called 52 * from %p with timer not initialized\n" 53 * message (960131). 54 * Christian Daudt : removed del_timer from 55 * igmp_timer_expire function (960205). 56 * Christian Daudt : igmp_heard_report now only calls 57 * igmp_timer_expire if tm->running is 58 * true (960216). 59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 60 * igmp_heard_query never trigger. Expiry 61 * miscalculation fixed in igmp_heard_query 62 * and random() made to return unsigned to 63 * prevent negative expiry times. 64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 65 * fix from pending 2.1.x patches. 66 * Alan Cox: Forget to enable FDDI support earlier. 67 * Alexey Kuznetsov: Fixed leaving groups on device down. 68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 69 * David L Stevens: IGMPv3 support, with help from 70 * Vinay Kulkarni 71 */ 72 73 #include <linux/module.h> 74 #include <linux/slab.h> 75 #include <asm/uaccess.h> 76 #include <linux/types.h> 77 #include <linux/kernel.h> 78 #include <linux/jiffies.h> 79 #include <linux/string.h> 80 #include <linux/socket.h> 81 #include <linux/sockios.h> 82 #include <linux/in.h> 83 #include <linux/inet.h> 84 #include <linux/netdevice.h> 85 #include <linux/skbuff.h> 86 #include <linux/inetdevice.h> 87 #include <linux/igmp.h> 88 #include <linux/if_arp.h> 89 #include <linux/rtnetlink.h> 90 #include <linux/times.h> 91 #include <linux/pkt_sched.h> 92 93 #include <net/net_namespace.h> 94 #include <net/arp.h> 95 #include <net/ip.h> 96 #include <net/protocol.h> 97 #include <net/route.h> 98 #include <net/sock.h> 99 #include <net/checksum.h> 100 #include <net/inet_common.h> 101 #include <linux/netfilter_ipv4.h> 102 #ifdef CONFIG_IP_MROUTE 103 #include <linux/mroute.h> 104 #endif 105 #ifdef CONFIG_PROC_FS 106 #include <linux/proc_fs.h> 107 #include <linux/seq_file.h> 108 #endif 109 110 #define IP_MAX_MEMBERSHIPS 20 111 #define IP_MAX_MSF 10 112 113 /* IGMP reports for link-local multicast groups are enabled by default */ 114 int sysctl_igmp_llm_reports __read_mostly = 1; 115 116 #ifdef CONFIG_IP_MULTICAST 117 /* Parameter names and values are taken from igmp-v2-06 draft */ 118 119 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) 120 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) 121 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) 122 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) 123 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) 124 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 125 126 127 #define IGMP_INITIAL_REPORT_DELAY (1) 128 129 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! 130 * IGMP specs require to report membership immediately after 131 * joining a group, but we delay the first report by a 132 * small interval. It seems more natural and still does not 133 * contradict to specs provided this delay is small enough. 134 */ 135 136 #define IGMP_V1_SEEN(in_dev) \ 137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 139 ((in_dev)->mr_v1_seen && \ 140 time_before(jiffies, (in_dev)->mr_v1_seen))) 141 #define IGMP_V2_SEEN(in_dev) \ 142 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 143 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 144 ((in_dev)->mr_v2_seen && \ 145 time_before(jiffies, (in_dev)->mr_v2_seen))) 146 147 static int unsolicited_report_interval(struct in_device *in_dev) 148 { 149 int interval_ms, interval_jiffies; 150 151 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 152 interval_ms = IN_DEV_CONF_GET( 153 in_dev, 154 IGMPV2_UNSOLICITED_REPORT_INTERVAL); 155 else /* v3 */ 156 interval_ms = IN_DEV_CONF_GET( 157 in_dev, 158 IGMPV3_UNSOLICITED_REPORT_INTERVAL); 159 160 interval_jiffies = msecs_to_jiffies(interval_ms); 161 162 /* _timer functions can't handle a delay of 0 jiffies so ensure 163 * we always return a positive value. 164 */ 165 if (interval_jiffies <= 0) 166 interval_jiffies = 1; 167 return interval_jiffies; 168 } 169 170 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 171 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 172 static void igmpv3_clear_delrec(struct in_device *in_dev); 173 static int sf_setstate(struct ip_mc_list *pmc); 174 static void sf_markstate(struct ip_mc_list *pmc); 175 #endif 176 static void ip_mc_clear_src(struct ip_mc_list *pmc); 177 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 178 int sfcount, __be32 *psfsrc, int delta); 179 180 static void ip_ma_put(struct ip_mc_list *im) 181 { 182 if (atomic_dec_and_test(&im->refcnt)) { 183 in_dev_put(im->interface); 184 kfree_rcu(im, rcu); 185 } 186 } 187 188 #define for_each_pmc_rcu(in_dev, pmc) \ 189 for (pmc = rcu_dereference(in_dev->mc_list); \ 190 pmc != NULL; \ 191 pmc = rcu_dereference(pmc->next_rcu)) 192 193 #define for_each_pmc_rtnl(in_dev, pmc) \ 194 for (pmc = rtnl_dereference(in_dev->mc_list); \ 195 pmc != NULL; \ 196 pmc = rtnl_dereference(pmc->next_rcu)) 197 198 #ifdef CONFIG_IP_MULTICAST 199 200 /* 201 * Timer management 202 */ 203 204 static void igmp_stop_timer(struct ip_mc_list *im) 205 { 206 spin_lock_bh(&im->lock); 207 if (del_timer(&im->timer)) 208 atomic_dec(&im->refcnt); 209 im->tm_running = 0; 210 im->reporter = 0; 211 im->unsolicit_count = 0; 212 spin_unlock_bh(&im->lock); 213 } 214 215 /* It must be called with locked im->lock */ 216 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 217 { 218 int tv = prandom_u32() % max_delay; 219 220 im->tm_running = 1; 221 if (!mod_timer(&im->timer, jiffies+tv+2)) 222 atomic_inc(&im->refcnt); 223 } 224 225 static void igmp_gq_start_timer(struct in_device *in_dev) 226 { 227 int tv = prandom_u32() % in_dev->mr_maxdelay; 228 229 in_dev->mr_gq_running = 1; 230 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 231 in_dev_hold(in_dev); 232 } 233 234 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 235 { 236 int tv = prandom_u32() % delay; 237 238 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 239 in_dev_hold(in_dev); 240 } 241 242 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 243 { 244 spin_lock_bh(&im->lock); 245 im->unsolicit_count = 0; 246 if (del_timer(&im->timer)) { 247 if ((long)(im->timer.expires-jiffies) < max_delay) { 248 add_timer(&im->timer); 249 im->tm_running = 1; 250 spin_unlock_bh(&im->lock); 251 return; 252 } 253 atomic_dec(&im->refcnt); 254 } 255 igmp_start_timer(im, max_delay); 256 spin_unlock_bh(&im->lock); 257 } 258 259 260 /* 261 * Send an IGMP report. 262 */ 263 264 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 265 266 267 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 268 int gdeleted, int sdeleted) 269 { 270 switch (type) { 271 case IGMPV3_MODE_IS_INCLUDE: 272 case IGMPV3_MODE_IS_EXCLUDE: 273 if (gdeleted || sdeleted) 274 return 0; 275 if (!(pmc->gsquery && !psf->sf_gsresp)) { 276 if (pmc->sfmode == MCAST_INCLUDE) 277 return 1; 278 /* don't include if this source is excluded 279 * in all filters 280 */ 281 if (psf->sf_count[MCAST_INCLUDE]) 282 return type == IGMPV3_MODE_IS_INCLUDE; 283 return pmc->sfcount[MCAST_EXCLUDE] == 284 psf->sf_count[MCAST_EXCLUDE]; 285 } 286 return 0; 287 case IGMPV3_CHANGE_TO_INCLUDE: 288 if (gdeleted || sdeleted) 289 return 0; 290 return psf->sf_count[MCAST_INCLUDE] != 0; 291 case IGMPV3_CHANGE_TO_EXCLUDE: 292 if (gdeleted || sdeleted) 293 return 0; 294 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 295 psf->sf_count[MCAST_INCLUDE]) 296 return 0; 297 return pmc->sfcount[MCAST_EXCLUDE] == 298 psf->sf_count[MCAST_EXCLUDE]; 299 case IGMPV3_ALLOW_NEW_SOURCES: 300 if (gdeleted || !psf->sf_crcount) 301 return 0; 302 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 303 case IGMPV3_BLOCK_OLD_SOURCES: 304 if (pmc->sfmode == MCAST_INCLUDE) 305 return gdeleted || (psf->sf_crcount && sdeleted); 306 return psf->sf_crcount && !gdeleted && !sdeleted; 307 } 308 return 0; 309 } 310 311 static int 312 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 313 { 314 struct ip_sf_list *psf; 315 int scount = 0; 316 317 for (psf = pmc->sources; psf; psf = psf->sf_next) { 318 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 319 continue; 320 scount++; 321 } 322 return scount; 323 } 324 325 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) 326 { 327 struct sk_buff *skb; 328 struct rtable *rt; 329 struct iphdr *pip; 330 struct igmpv3_report *pig; 331 struct net *net = dev_net(dev); 332 struct flowi4 fl4; 333 int hlen = LL_RESERVED_SPACE(dev); 334 int tlen = dev->needed_tailroom; 335 unsigned int size = mtu; 336 337 while (1) { 338 skb = alloc_skb(size + hlen + tlen, 339 GFP_ATOMIC | __GFP_NOWARN); 340 if (skb) 341 break; 342 size >>= 1; 343 if (size < 256) 344 return NULL; 345 } 346 skb->priority = TC_PRIO_CONTROL; 347 348 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 349 0, 0, 350 IPPROTO_IGMP, 0, dev->ifindex); 351 if (IS_ERR(rt)) { 352 kfree_skb(skb); 353 return NULL; 354 } 355 356 skb_dst_set(skb, &rt->dst); 357 skb->dev = dev; 358 359 skb_reserve(skb, hlen); 360 skb_tailroom_reserve(skb, mtu, tlen); 361 362 skb_reset_network_header(skb); 363 pip = ip_hdr(skb); 364 skb_put(skb, sizeof(struct iphdr) + 4); 365 366 pip->version = 4; 367 pip->ihl = (sizeof(struct iphdr)+4)>>2; 368 pip->tos = 0xc0; 369 pip->frag_off = htons(IP_DF); 370 pip->ttl = 1; 371 pip->daddr = fl4.daddr; 372 pip->saddr = fl4.saddr; 373 pip->protocol = IPPROTO_IGMP; 374 pip->tot_len = 0; /* filled in later */ 375 ip_select_ident(net, skb, NULL); 376 ((u8 *)&pip[1])[0] = IPOPT_RA; 377 ((u8 *)&pip[1])[1] = 4; 378 ((u8 *)&pip[1])[2] = 0; 379 ((u8 *)&pip[1])[3] = 0; 380 381 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 382 skb_put(skb, sizeof(*pig)); 383 pig = igmpv3_report_hdr(skb); 384 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 385 pig->resv1 = 0; 386 pig->csum = 0; 387 pig->resv2 = 0; 388 pig->ngrec = 0; 389 return skb; 390 } 391 392 static int igmpv3_sendpack(struct sk_buff *skb) 393 { 394 struct igmphdr *pig = igmp_hdr(skb); 395 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); 396 397 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 398 399 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 400 } 401 402 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 403 { 404 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 405 } 406 407 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 408 int type, struct igmpv3_grec **ppgr) 409 { 410 struct net_device *dev = pmc->interface->dev; 411 struct igmpv3_report *pih; 412 struct igmpv3_grec *pgr; 413 414 if (!skb) 415 skb = igmpv3_newpack(dev, dev->mtu); 416 if (!skb) 417 return NULL; 418 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 419 pgr->grec_type = type; 420 pgr->grec_auxwords = 0; 421 pgr->grec_nsrcs = 0; 422 pgr->grec_mca = pmc->multiaddr; 423 pih = igmpv3_report_hdr(skb); 424 pih->ngrec = htons(ntohs(pih->ngrec)+1); 425 *ppgr = pgr; 426 return skb; 427 } 428 429 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 430 431 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 432 int type, int gdeleted, int sdeleted) 433 { 434 struct net_device *dev = pmc->interface->dev; 435 struct igmpv3_report *pih; 436 struct igmpv3_grec *pgr = NULL; 437 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 438 int scount, stotal, first, isquery, truncate; 439 440 if (pmc->multiaddr == IGMP_ALL_HOSTS) 441 return skb; 442 if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports) 443 return skb; 444 445 isquery = type == IGMPV3_MODE_IS_INCLUDE || 446 type == IGMPV3_MODE_IS_EXCLUDE; 447 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 448 type == IGMPV3_CHANGE_TO_EXCLUDE; 449 450 stotal = scount = 0; 451 452 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 453 454 if (!*psf_list) 455 goto empty_source; 456 457 pih = skb ? igmpv3_report_hdr(skb) : NULL; 458 459 /* EX and TO_EX get a fresh packet, if needed */ 460 if (truncate) { 461 if (pih && pih->ngrec && 462 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 463 if (skb) 464 igmpv3_sendpack(skb); 465 skb = igmpv3_newpack(dev, dev->mtu); 466 } 467 } 468 first = 1; 469 psf_prev = NULL; 470 for (psf = *psf_list; psf; psf = psf_next) { 471 __be32 *psrc; 472 473 psf_next = psf->sf_next; 474 475 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 476 psf_prev = psf; 477 continue; 478 } 479 480 /* clear marks on query responses */ 481 if (isquery) 482 psf->sf_gsresp = 0; 483 484 if (AVAILABLE(skb) < sizeof(__be32) + 485 first*sizeof(struct igmpv3_grec)) { 486 if (truncate && !first) 487 break; /* truncate these */ 488 if (pgr) 489 pgr->grec_nsrcs = htons(scount); 490 if (skb) 491 igmpv3_sendpack(skb); 492 skb = igmpv3_newpack(dev, dev->mtu); 493 first = 1; 494 scount = 0; 495 } 496 if (first) { 497 skb = add_grhead(skb, pmc, type, &pgr); 498 first = 0; 499 } 500 if (!skb) 501 return NULL; 502 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 503 *psrc = psf->sf_inaddr; 504 scount++; stotal++; 505 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 506 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 507 psf->sf_crcount--; 508 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 509 if (psf_prev) 510 psf_prev->sf_next = psf->sf_next; 511 else 512 *psf_list = psf->sf_next; 513 kfree(psf); 514 continue; 515 } 516 } 517 psf_prev = psf; 518 } 519 520 empty_source: 521 if (!stotal) { 522 if (type == IGMPV3_ALLOW_NEW_SOURCES || 523 type == IGMPV3_BLOCK_OLD_SOURCES) 524 return skb; 525 if (pmc->crcount || isquery) { 526 /* make sure we have room for group header */ 527 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { 528 igmpv3_sendpack(skb); 529 skb = NULL; /* add_grhead will get a new one */ 530 } 531 skb = add_grhead(skb, pmc, type, &pgr); 532 } 533 } 534 if (pgr) 535 pgr->grec_nsrcs = htons(scount); 536 537 if (isquery) 538 pmc->gsquery = 0; /* clear query state on report */ 539 return skb; 540 } 541 542 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 543 { 544 struct sk_buff *skb = NULL; 545 int type; 546 547 if (!pmc) { 548 rcu_read_lock(); 549 for_each_pmc_rcu(in_dev, pmc) { 550 if (pmc->multiaddr == IGMP_ALL_HOSTS) 551 continue; 552 if (ipv4_is_local_multicast(pmc->multiaddr) && 553 !sysctl_igmp_llm_reports) 554 continue; 555 spin_lock_bh(&pmc->lock); 556 if (pmc->sfcount[MCAST_EXCLUDE]) 557 type = IGMPV3_MODE_IS_EXCLUDE; 558 else 559 type = IGMPV3_MODE_IS_INCLUDE; 560 skb = add_grec(skb, pmc, type, 0, 0); 561 spin_unlock_bh(&pmc->lock); 562 } 563 rcu_read_unlock(); 564 } else { 565 spin_lock_bh(&pmc->lock); 566 if (pmc->sfcount[MCAST_EXCLUDE]) 567 type = IGMPV3_MODE_IS_EXCLUDE; 568 else 569 type = IGMPV3_MODE_IS_INCLUDE; 570 skb = add_grec(skb, pmc, type, 0, 0); 571 spin_unlock_bh(&pmc->lock); 572 } 573 if (!skb) 574 return 0; 575 return igmpv3_sendpack(skb); 576 } 577 578 /* 579 * remove zero-count source records from a source filter list 580 */ 581 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 582 { 583 struct ip_sf_list *psf_prev, *psf_next, *psf; 584 585 psf_prev = NULL; 586 for (psf = *ppsf; psf; psf = psf_next) { 587 psf_next = psf->sf_next; 588 if (psf->sf_crcount == 0) { 589 if (psf_prev) 590 psf_prev->sf_next = psf->sf_next; 591 else 592 *ppsf = psf->sf_next; 593 kfree(psf); 594 } else 595 psf_prev = psf; 596 } 597 } 598 599 static void igmpv3_send_cr(struct in_device *in_dev) 600 { 601 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 602 struct sk_buff *skb = NULL; 603 int type, dtype; 604 605 rcu_read_lock(); 606 spin_lock_bh(&in_dev->mc_tomb_lock); 607 608 /* deleted MCA's */ 609 pmc_prev = NULL; 610 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { 611 pmc_next = pmc->next; 612 if (pmc->sfmode == MCAST_INCLUDE) { 613 type = IGMPV3_BLOCK_OLD_SOURCES; 614 dtype = IGMPV3_BLOCK_OLD_SOURCES; 615 skb = add_grec(skb, pmc, type, 1, 0); 616 skb = add_grec(skb, pmc, dtype, 1, 1); 617 } 618 if (pmc->crcount) { 619 if (pmc->sfmode == MCAST_EXCLUDE) { 620 type = IGMPV3_CHANGE_TO_INCLUDE; 621 skb = add_grec(skb, pmc, type, 1, 0); 622 } 623 pmc->crcount--; 624 if (pmc->crcount == 0) { 625 igmpv3_clear_zeros(&pmc->tomb); 626 igmpv3_clear_zeros(&pmc->sources); 627 } 628 } 629 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 630 if (pmc_prev) 631 pmc_prev->next = pmc_next; 632 else 633 in_dev->mc_tomb = pmc_next; 634 in_dev_put(pmc->interface); 635 kfree(pmc); 636 } else 637 pmc_prev = pmc; 638 } 639 spin_unlock_bh(&in_dev->mc_tomb_lock); 640 641 /* change recs */ 642 for_each_pmc_rcu(in_dev, pmc) { 643 spin_lock_bh(&pmc->lock); 644 if (pmc->sfcount[MCAST_EXCLUDE]) { 645 type = IGMPV3_BLOCK_OLD_SOURCES; 646 dtype = IGMPV3_ALLOW_NEW_SOURCES; 647 } else { 648 type = IGMPV3_ALLOW_NEW_SOURCES; 649 dtype = IGMPV3_BLOCK_OLD_SOURCES; 650 } 651 skb = add_grec(skb, pmc, type, 0, 0); 652 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 653 654 /* filter mode changes */ 655 if (pmc->crcount) { 656 if (pmc->sfmode == MCAST_EXCLUDE) 657 type = IGMPV3_CHANGE_TO_EXCLUDE; 658 else 659 type = IGMPV3_CHANGE_TO_INCLUDE; 660 skb = add_grec(skb, pmc, type, 0, 0); 661 pmc->crcount--; 662 } 663 spin_unlock_bh(&pmc->lock); 664 } 665 rcu_read_unlock(); 666 667 if (!skb) 668 return; 669 (void) igmpv3_sendpack(skb); 670 } 671 672 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 673 int type) 674 { 675 struct sk_buff *skb; 676 struct iphdr *iph; 677 struct igmphdr *ih; 678 struct rtable *rt; 679 struct net_device *dev = in_dev->dev; 680 struct net *net = dev_net(dev); 681 __be32 group = pmc ? pmc->multiaddr : 0; 682 struct flowi4 fl4; 683 __be32 dst; 684 int hlen, tlen; 685 686 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 687 return igmpv3_send_report(in_dev, pmc); 688 689 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports) 690 return 0; 691 692 if (type == IGMP_HOST_LEAVE_MESSAGE) 693 dst = IGMP_ALL_ROUTER; 694 else 695 dst = group; 696 697 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 698 0, 0, 699 IPPROTO_IGMP, 0, dev->ifindex); 700 if (IS_ERR(rt)) 701 return -1; 702 703 hlen = LL_RESERVED_SPACE(dev); 704 tlen = dev->needed_tailroom; 705 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 706 if (!skb) { 707 ip_rt_put(rt); 708 return -1; 709 } 710 skb->priority = TC_PRIO_CONTROL; 711 712 skb_dst_set(skb, &rt->dst); 713 714 skb_reserve(skb, hlen); 715 716 skb_reset_network_header(skb); 717 iph = ip_hdr(skb); 718 skb_put(skb, sizeof(struct iphdr) + 4); 719 720 iph->version = 4; 721 iph->ihl = (sizeof(struct iphdr)+4)>>2; 722 iph->tos = 0xc0; 723 iph->frag_off = htons(IP_DF); 724 iph->ttl = 1; 725 iph->daddr = dst; 726 iph->saddr = fl4.saddr; 727 iph->protocol = IPPROTO_IGMP; 728 ip_select_ident(net, skb, NULL); 729 ((u8 *)&iph[1])[0] = IPOPT_RA; 730 ((u8 *)&iph[1])[1] = 4; 731 ((u8 *)&iph[1])[2] = 0; 732 ((u8 *)&iph[1])[3] = 0; 733 734 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 735 ih->type = type; 736 ih->code = 0; 737 ih->csum = 0; 738 ih->group = group; 739 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 740 741 return ip_local_out(net, skb->sk, skb); 742 } 743 744 static void igmp_gq_timer_expire(unsigned long data) 745 { 746 struct in_device *in_dev = (struct in_device *)data; 747 748 in_dev->mr_gq_running = 0; 749 igmpv3_send_report(in_dev, NULL); 750 in_dev_put(in_dev); 751 } 752 753 static void igmp_ifc_timer_expire(unsigned long data) 754 { 755 struct in_device *in_dev = (struct in_device *)data; 756 757 igmpv3_send_cr(in_dev); 758 if (in_dev->mr_ifc_count) { 759 in_dev->mr_ifc_count--; 760 igmp_ifc_start_timer(in_dev, 761 unsolicited_report_interval(in_dev)); 762 } 763 in_dev_put(in_dev); 764 } 765 766 static void igmp_ifc_event(struct in_device *in_dev) 767 { 768 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 769 return; 770 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv; 771 igmp_ifc_start_timer(in_dev, 1); 772 } 773 774 775 static void igmp_timer_expire(unsigned long data) 776 { 777 struct ip_mc_list *im = (struct ip_mc_list *)data; 778 struct in_device *in_dev = im->interface; 779 780 spin_lock(&im->lock); 781 im->tm_running = 0; 782 783 if (im->unsolicit_count) { 784 im->unsolicit_count--; 785 igmp_start_timer(im, unsolicited_report_interval(in_dev)); 786 } 787 im->reporter = 1; 788 spin_unlock(&im->lock); 789 790 if (IGMP_V1_SEEN(in_dev)) 791 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 792 else if (IGMP_V2_SEEN(in_dev)) 793 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 794 else 795 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 796 797 ip_ma_put(im); 798 } 799 800 /* mark EXCLUDE-mode sources */ 801 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 802 { 803 struct ip_sf_list *psf; 804 int i, scount; 805 806 scount = 0; 807 for (psf = pmc->sources; psf; psf = psf->sf_next) { 808 if (scount == nsrcs) 809 break; 810 for (i = 0; i < nsrcs; i++) { 811 /* skip inactive filters */ 812 if (psf->sf_count[MCAST_INCLUDE] || 813 pmc->sfcount[MCAST_EXCLUDE] != 814 psf->sf_count[MCAST_EXCLUDE]) 815 break; 816 if (srcs[i] == psf->sf_inaddr) { 817 scount++; 818 break; 819 } 820 } 821 } 822 pmc->gsquery = 0; 823 if (scount == nsrcs) /* all sources excluded */ 824 return 0; 825 return 1; 826 } 827 828 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 829 { 830 struct ip_sf_list *psf; 831 int i, scount; 832 833 if (pmc->sfmode == MCAST_EXCLUDE) 834 return igmp_xmarksources(pmc, nsrcs, srcs); 835 836 /* mark INCLUDE-mode sources */ 837 scount = 0; 838 for (psf = pmc->sources; psf; psf = psf->sf_next) { 839 if (scount == nsrcs) 840 break; 841 for (i = 0; i < nsrcs; i++) 842 if (srcs[i] == psf->sf_inaddr) { 843 psf->sf_gsresp = 1; 844 scount++; 845 break; 846 } 847 } 848 if (!scount) { 849 pmc->gsquery = 0; 850 return 0; 851 } 852 pmc->gsquery = 1; 853 return 1; 854 } 855 856 /* return true if packet was dropped */ 857 static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 858 { 859 struct ip_mc_list *im; 860 861 /* Timers are only set for non-local groups */ 862 863 if (group == IGMP_ALL_HOSTS) 864 return false; 865 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports) 866 return false; 867 868 rcu_read_lock(); 869 for_each_pmc_rcu(in_dev, im) { 870 if (im->multiaddr == group) { 871 igmp_stop_timer(im); 872 break; 873 } 874 } 875 rcu_read_unlock(); 876 return false; 877 } 878 879 /* return true if packet was dropped */ 880 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 881 int len) 882 { 883 struct igmphdr *ih = igmp_hdr(skb); 884 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 885 struct ip_mc_list *im; 886 __be32 group = ih->group; 887 int max_delay; 888 int mark = 0; 889 890 891 if (len == 8) { 892 if (ih->code == 0) { 893 /* Alas, old v1 router presents here. */ 894 895 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 896 in_dev->mr_v1_seen = jiffies + 897 IGMP_V1_ROUTER_PRESENT_TIMEOUT; 898 group = 0; 899 } else { 900 /* v2 router present */ 901 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 902 in_dev->mr_v2_seen = jiffies + 903 IGMP_V2_ROUTER_PRESENT_TIMEOUT; 904 } 905 /* cancel the interface change timer */ 906 in_dev->mr_ifc_count = 0; 907 if (del_timer(&in_dev->mr_ifc_timer)) 908 __in_dev_put(in_dev); 909 /* clear deleted report items */ 910 igmpv3_clear_delrec(in_dev); 911 } else if (len < 12) { 912 return true; /* ignore bogus packet; freed by caller */ 913 } else if (IGMP_V1_SEEN(in_dev)) { 914 /* This is a v3 query with v1 queriers present */ 915 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 916 group = 0; 917 } else if (IGMP_V2_SEEN(in_dev)) { 918 /* this is a v3 query with v2 queriers present; 919 * Interpretation of the max_delay code is problematic here. 920 * A real v2 host would use ih_code directly, while v3 has a 921 * different encoding. We use the v3 encoding as more likely 922 * to be intended in a v3 query. 923 */ 924 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 925 if (!max_delay) 926 max_delay = 1; /* can't mod w/ 0 */ 927 } else { /* v3 */ 928 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 929 return true; 930 931 ih3 = igmpv3_query_hdr(skb); 932 if (ih3->nsrcs) { 933 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 934 + ntohs(ih3->nsrcs)*sizeof(__be32))) 935 return true; 936 ih3 = igmpv3_query_hdr(skb); 937 } 938 939 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 940 if (!max_delay) 941 max_delay = 1; /* can't mod w/ 0 */ 942 in_dev->mr_maxdelay = max_delay; 943 if (ih3->qrv) 944 in_dev->mr_qrv = ih3->qrv; 945 if (!group) { /* general query */ 946 if (ih3->nsrcs) 947 return true; /* no sources allowed */ 948 igmp_gq_start_timer(in_dev); 949 return false; 950 } 951 /* mark sources to include, if group & source-specific */ 952 mark = ih3->nsrcs != 0; 953 } 954 955 /* 956 * - Start the timers in all of our membership records 957 * that the query applies to for the interface on 958 * which the query arrived excl. those that belong 959 * to a "local" group (224.0.0.X) 960 * - For timers already running check if they need to 961 * be reset. 962 * - Use the igmp->igmp_code field as the maximum 963 * delay possible 964 */ 965 rcu_read_lock(); 966 for_each_pmc_rcu(in_dev, im) { 967 int changed; 968 969 if (group && group != im->multiaddr) 970 continue; 971 if (im->multiaddr == IGMP_ALL_HOSTS) 972 continue; 973 if (ipv4_is_local_multicast(im->multiaddr) && 974 !sysctl_igmp_llm_reports) 975 continue; 976 spin_lock_bh(&im->lock); 977 if (im->tm_running) 978 im->gsquery = im->gsquery && mark; 979 else 980 im->gsquery = mark; 981 changed = !im->gsquery || 982 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 983 spin_unlock_bh(&im->lock); 984 if (changed) 985 igmp_mod_timer(im, max_delay); 986 } 987 rcu_read_unlock(); 988 return false; 989 } 990 991 /* called in rcu_read_lock() section */ 992 int igmp_rcv(struct sk_buff *skb) 993 { 994 /* This basically follows the spec line by line -- see RFC1112 */ 995 struct igmphdr *ih; 996 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 997 int len = skb->len; 998 bool dropped = true; 999 1000 if (!in_dev) 1001 goto drop; 1002 1003 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 1004 goto drop; 1005 1006 if (skb_checksum_simple_validate(skb)) 1007 goto drop; 1008 1009 ih = igmp_hdr(skb); 1010 switch (ih->type) { 1011 case IGMP_HOST_MEMBERSHIP_QUERY: 1012 dropped = igmp_heard_query(in_dev, skb, len); 1013 break; 1014 case IGMP_HOST_MEMBERSHIP_REPORT: 1015 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1016 /* Is it our report looped back? */ 1017 if (rt_is_output_route(skb_rtable(skb))) 1018 break; 1019 /* don't rely on MC router hearing unicast reports */ 1020 if (skb->pkt_type == PACKET_MULTICAST || 1021 skb->pkt_type == PACKET_BROADCAST) 1022 dropped = igmp_heard_report(in_dev, ih->group); 1023 break; 1024 case IGMP_PIM: 1025 #ifdef CONFIG_IP_PIMSM_V1 1026 return pim_rcv_v1(skb); 1027 #endif 1028 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1029 case IGMP_DVMRP: 1030 case IGMP_TRACE: 1031 case IGMP_HOST_LEAVE_MESSAGE: 1032 case IGMP_MTRACE: 1033 case IGMP_MTRACE_RESP: 1034 break; 1035 default: 1036 break; 1037 } 1038 1039 drop: 1040 if (dropped) 1041 kfree_skb(skb); 1042 else 1043 consume_skb(skb); 1044 return 0; 1045 } 1046 1047 #endif 1048 1049 1050 /* 1051 * Add a filter to a device 1052 */ 1053 1054 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1055 { 1056 char buf[MAX_ADDR_LEN]; 1057 struct net_device *dev = in_dev->dev; 1058 1059 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1060 We will get multicast token leakage, when IFF_MULTICAST 1061 is changed. This check should be done in ndo_set_rx_mode 1062 routine. Something sort of: 1063 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1064 --ANK 1065 */ 1066 if (arp_mc_map(addr, buf, dev, 0) == 0) 1067 dev_mc_add(dev, buf); 1068 } 1069 1070 /* 1071 * Remove a filter from a device 1072 */ 1073 1074 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1075 { 1076 char buf[MAX_ADDR_LEN]; 1077 struct net_device *dev = in_dev->dev; 1078 1079 if (arp_mc_map(addr, buf, dev, 0) == 0) 1080 dev_mc_del(dev, buf); 1081 } 1082 1083 #ifdef CONFIG_IP_MULTICAST 1084 /* 1085 * deleted ip_mc_list manipulation 1086 */ 1087 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1088 { 1089 struct ip_mc_list *pmc; 1090 1091 /* this is an "ip_mc_list" for convenience; only the fields below 1092 * are actually used. In particular, the refcnt and users are not 1093 * used for management of the delete list. Using the same structure 1094 * for deleted items allows change reports to use common code with 1095 * non-deleted or query-response MCA's. 1096 */ 1097 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1098 if (!pmc) 1099 return; 1100 spin_lock_bh(&im->lock); 1101 pmc->interface = im->interface; 1102 in_dev_hold(in_dev); 1103 pmc->multiaddr = im->multiaddr; 1104 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1105 pmc->sfmode = im->sfmode; 1106 if (pmc->sfmode == MCAST_INCLUDE) { 1107 struct ip_sf_list *psf; 1108 1109 pmc->tomb = im->tomb; 1110 pmc->sources = im->sources; 1111 im->tomb = im->sources = NULL; 1112 for (psf = pmc->sources; psf; psf = psf->sf_next) 1113 psf->sf_crcount = pmc->crcount; 1114 } 1115 spin_unlock_bh(&im->lock); 1116 1117 spin_lock_bh(&in_dev->mc_tomb_lock); 1118 pmc->next = in_dev->mc_tomb; 1119 in_dev->mc_tomb = pmc; 1120 spin_unlock_bh(&in_dev->mc_tomb_lock); 1121 } 1122 1123 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1124 { 1125 struct ip_mc_list *pmc, *pmc_prev; 1126 struct ip_sf_list *psf, *psf_next; 1127 1128 spin_lock_bh(&in_dev->mc_tomb_lock); 1129 pmc_prev = NULL; 1130 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1131 if (pmc->multiaddr == multiaddr) 1132 break; 1133 pmc_prev = pmc; 1134 } 1135 if (pmc) { 1136 if (pmc_prev) 1137 pmc_prev->next = pmc->next; 1138 else 1139 in_dev->mc_tomb = pmc->next; 1140 } 1141 spin_unlock_bh(&in_dev->mc_tomb_lock); 1142 if (pmc) { 1143 for (psf = pmc->tomb; psf; psf = psf_next) { 1144 psf_next = psf->sf_next; 1145 kfree(psf); 1146 } 1147 in_dev_put(pmc->interface); 1148 kfree(pmc); 1149 } 1150 } 1151 1152 static void igmpv3_clear_delrec(struct in_device *in_dev) 1153 { 1154 struct ip_mc_list *pmc, *nextpmc; 1155 1156 spin_lock_bh(&in_dev->mc_tomb_lock); 1157 pmc = in_dev->mc_tomb; 1158 in_dev->mc_tomb = NULL; 1159 spin_unlock_bh(&in_dev->mc_tomb_lock); 1160 1161 for (; pmc; pmc = nextpmc) { 1162 nextpmc = pmc->next; 1163 ip_mc_clear_src(pmc); 1164 in_dev_put(pmc->interface); 1165 kfree(pmc); 1166 } 1167 /* clear dead sources, too */ 1168 rcu_read_lock(); 1169 for_each_pmc_rcu(in_dev, pmc) { 1170 struct ip_sf_list *psf, *psf_next; 1171 1172 spin_lock_bh(&pmc->lock); 1173 psf = pmc->tomb; 1174 pmc->tomb = NULL; 1175 spin_unlock_bh(&pmc->lock); 1176 for (; psf; psf = psf_next) { 1177 psf_next = psf->sf_next; 1178 kfree(psf); 1179 } 1180 } 1181 rcu_read_unlock(); 1182 } 1183 #endif 1184 1185 static void igmp_group_dropped(struct ip_mc_list *im) 1186 { 1187 struct in_device *in_dev = im->interface; 1188 #ifdef CONFIG_IP_MULTICAST 1189 int reporter; 1190 #endif 1191 1192 if (im->loaded) { 1193 im->loaded = 0; 1194 ip_mc_filter_del(in_dev, im->multiaddr); 1195 } 1196 1197 #ifdef CONFIG_IP_MULTICAST 1198 if (im->multiaddr == IGMP_ALL_HOSTS) 1199 return; 1200 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports) 1201 return; 1202 1203 reporter = im->reporter; 1204 igmp_stop_timer(im); 1205 1206 if (!in_dev->dead) { 1207 if (IGMP_V1_SEEN(in_dev)) 1208 return; 1209 if (IGMP_V2_SEEN(in_dev)) { 1210 if (reporter) 1211 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1212 return; 1213 } 1214 /* IGMPv3 */ 1215 igmpv3_add_delrec(in_dev, im); 1216 1217 igmp_ifc_event(in_dev); 1218 } 1219 #endif 1220 } 1221 1222 static void igmp_group_added(struct ip_mc_list *im) 1223 { 1224 struct in_device *in_dev = im->interface; 1225 1226 if (im->loaded == 0) { 1227 im->loaded = 1; 1228 ip_mc_filter_add(in_dev, im->multiaddr); 1229 } 1230 1231 #ifdef CONFIG_IP_MULTICAST 1232 if (im->multiaddr == IGMP_ALL_HOSTS) 1233 return; 1234 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports) 1235 return; 1236 1237 if (in_dev->dead) 1238 return; 1239 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1240 spin_lock_bh(&im->lock); 1241 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1242 spin_unlock_bh(&im->lock); 1243 return; 1244 } 1245 /* else, v3 */ 1246 1247 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1248 igmp_ifc_event(in_dev); 1249 #endif 1250 } 1251 1252 1253 /* 1254 * Multicast list managers 1255 */ 1256 1257 static u32 ip_mc_hash(const struct ip_mc_list *im) 1258 { 1259 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1260 } 1261 1262 static void ip_mc_hash_add(struct in_device *in_dev, 1263 struct ip_mc_list *im) 1264 { 1265 struct ip_mc_list __rcu **mc_hash; 1266 u32 hash; 1267 1268 mc_hash = rtnl_dereference(in_dev->mc_hash); 1269 if (mc_hash) { 1270 hash = ip_mc_hash(im); 1271 im->next_hash = mc_hash[hash]; 1272 rcu_assign_pointer(mc_hash[hash], im); 1273 return; 1274 } 1275 1276 /* do not use a hash table for small number of items */ 1277 if (in_dev->mc_count < 4) 1278 return; 1279 1280 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1281 GFP_KERNEL); 1282 if (!mc_hash) 1283 return; 1284 1285 for_each_pmc_rtnl(in_dev, im) { 1286 hash = ip_mc_hash(im); 1287 im->next_hash = mc_hash[hash]; 1288 RCU_INIT_POINTER(mc_hash[hash], im); 1289 } 1290 1291 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1292 } 1293 1294 static void ip_mc_hash_remove(struct in_device *in_dev, 1295 struct ip_mc_list *im) 1296 { 1297 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1298 struct ip_mc_list *aux; 1299 1300 if (!mc_hash) 1301 return; 1302 mc_hash += ip_mc_hash(im); 1303 while ((aux = rtnl_dereference(*mc_hash)) != im) 1304 mc_hash = &aux->next_hash; 1305 *mc_hash = im->next_hash; 1306 } 1307 1308 1309 /* 1310 * A socket has joined a multicast group on device dev. 1311 */ 1312 1313 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1314 { 1315 struct ip_mc_list *im; 1316 1317 ASSERT_RTNL(); 1318 1319 for_each_pmc_rtnl(in_dev, im) { 1320 if (im->multiaddr == addr) { 1321 im->users++; 1322 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1323 goto out; 1324 } 1325 } 1326 1327 im = kzalloc(sizeof(*im), GFP_KERNEL); 1328 if (!im) 1329 goto out; 1330 1331 im->users = 1; 1332 im->interface = in_dev; 1333 in_dev_hold(in_dev); 1334 im->multiaddr = addr; 1335 /* initial mode is (EX, empty) */ 1336 im->sfmode = MCAST_EXCLUDE; 1337 im->sfcount[MCAST_EXCLUDE] = 1; 1338 atomic_set(&im->refcnt, 1); 1339 spin_lock_init(&im->lock); 1340 #ifdef CONFIG_IP_MULTICAST 1341 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); 1342 im->unsolicit_count = sysctl_igmp_qrv; 1343 #endif 1344 1345 im->next_rcu = in_dev->mc_list; 1346 in_dev->mc_count++; 1347 rcu_assign_pointer(in_dev->mc_list, im); 1348 1349 ip_mc_hash_add(in_dev, im); 1350 1351 #ifdef CONFIG_IP_MULTICAST 1352 igmpv3_del_delrec(in_dev, im->multiaddr); 1353 #endif 1354 igmp_group_added(im); 1355 if (!in_dev->dead) 1356 ip_rt_multicast_event(in_dev); 1357 out: 1358 return; 1359 } 1360 EXPORT_SYMBOL(ip_mc_inc_group); 1361 1362 static int ip_mc_check_iphdr(struct sk_buff *skb) 1363 { 1364 const struct iphdr *iph; 1365 unsigned int len; 1366 unsigned int offset = skb_network_offset(skb) + sizeof(*iph); 1367 1368 if (!pskb_may_pull(skb, offset)) 1369 return -EINVAL; 1370 1371 iph = ip_hdr(skb); 1372 1373 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) 1374 return -EINVAL; 1375 1376 offset += ip_hdrlen(skb) - sizeof(*iph); 1377 1378 if (!pskb_may_pull(skb, offset)) 1379 return -EINVAL; 1380 1381 iph = ip_hdr(skb); 1382 1383 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1384 return -EINVAL; 1385 1386 len = skb_network_offset(skb) + ntohs(iph->tot_len); 1387 if (skb->len < len || len < offset) 1388 return -EINVAL; 1389 1390 skb_set_transport_header(skb, offset); 1391 1392 return 0; 1393 } 1394 1395 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) 1396 { 1397 unsigned int len = skb_transport_offset(skb); 1398 1399 len += sizeof(struct igmpv3_report); 1400 1401 return pskb_may_pull(skb, len) ? 0 : -EINVAL; 1402 } 1403 1404 static int ip_mc_check_igmp_query(struct sk_buff *skb) 1405 { 1406 unsigned int len = skb_transport_offset(skb); 1407 1408 len += sizeof(struct igmphdr); 1409 if (skb->len < len) 1410 return -EINVAL; 1411 1412 /* IGMPv{1,2}? */ 1413 if (skb->len != len) { 1414 /* or IGMPv3? */ 1415 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); 1416 if (skb->len < len || !pskb_may_pull(skb, len)) 1417 return -EINVAL; 1418 } 1419 1420 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1421 * all-systems destination addresses (224.0.0.1) for general queries 1422 */ 1423 if (!igmp_hdr(skb)->group && 1424 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) 1425 return -EINVAL; 1426 1427 return 0; 1428 } 1429 1430 static int ip_mc_check_igmp_msg(struct sk_buff *skb) 1431 { 1432 switch (igmp_hdr(skb)->type) { 1433 case IGMP_HOST_LEAVE_MESSAGE: 1434 case IGMP_HOST_MEMBERSHIP_REPORT: 1435 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1436 /* fall through */ 1437 return 0; 1438 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1439 return ip_mc_check_igmp_reportv3(skb); 1440 case IGMP_HOST_MEMBERSHIP_QUERY: 1441 return ip_mc_check_igmp_query(skb); 1442 default: 1443 return -ENOMSG; 1444 } 1445 } 1446 1447 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) 1448 { 1449 return skb_checksum_simple_validate(skb); 1450 } 1451 1452 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1453 1454 { 1455 struct sk_buff *skb_chk; 1456 unsigned int transport_len; 1457 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); 1458 int ret = -EINVAL; 1459 1460 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 1461 1462 skb_chk = skb_checksum_trimmed(skb, transport_len, 1463 ip_mc_validate_checksum); 1464 if (!skb_chk) 1465 goto err; 1466 1467 if (!pskb_may_pull(skb_chk, len)) 1468 goto err; 1469 1470 ret = ip_mc_check_igmp_msg(skb_chk); 1471 if (ret) 1472 goto err; 1473 1474 if (skb_trimmed) 1475 *skb_trimmed = skb_chk; 1476 /* free now unneeded clone */ 1477 else if (skb_chk != skb) 1478 kfree_skb(skb_chk); 1479 1480 ret = 0; 1481 1482 err: 1483 if (ret && skb_chk && skb_chk != skb) 1484 kfree_skb(skb_chk); 1485 1486 return ret; 1487 } 1488 1489 /** 1490 * ip_mc_check_igmp - checks whether this is a sane IGMP packet 1491 * @skb: the skb to validate 1492 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) 1493 * 1494 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets 1495 * skb transport header accordingly and returns zero. 1496 * 1497 * -EINVAL: A broken packet was detected, i.e. it violates some internet 1498 * standard 1499 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. 1500 * -ENOMEM: A memory allocation failure happened. 1501 * 1502 * Optionally, an skb pointer might be provided via skb_trimmed (or set it 1503 * to NULL): After parsing an IGMP packet successfully it will point to 1504 * an skb which has its tail aligned to the IP packet end. This might 1505 * either be the originally provided skb or a trimmed, cloned version if 1506 * the skb frame had data beyond the IP packet. A cloned skb allows us 1507 * to leave the original skb and its full frame unchanged (which might be 1508 * desirable for layer 2 frame jugglers). 1509 * 1510 * Caller needs to set the skb network header and free any returned skb if it 1511 * differs from the provided skb. 1512 */ 1513 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1514 { 1515 int ret = ip_mc_check_iphdr(skb); 1516 1517 if (ret < 0) 1518 return ret; 1519 1520 if (ip_hdr(skb)->protocol != IPPROTO_IGMP) 1521 return -ENOMSG; 1522 1523 return __ip_mc_check_igmp(skb, skb_trimmed); 1524 } 1525 EXPORT_SYMBOL(ip_mc_check_igmp); 1526 1527 /* 1528 * Resend IGMP JOIN report; used by netdev notifier. 1529 */ 1530 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1531 { 1532 #ifdef CONFIG_IP_MULTICAST 1533 struct ip_mc_list *im; 1534 int type; 1535 1536 ASSERT_RTNL(); 1537 1538 for_each_pmc_rtnl(in_dev, im) { 1539 if (im->multiaddr == IGMP_ALL_HOSTS) 1540 continue; 1541 if (ipv4_is_local_multicast(im->multiaddr) && 1542 !sysctl_igmp_llm_reports) 1543 continue; 1544 1545 /* a failover is happening and switches 1546 * must be notified immediately 1547 */ 1548 if (IGMP_V1_SEEN(in_dev)) 1549 type = IGMP_HOST_MEMBERSHIP_REPORT; 1550 else if (IGMP_V2_SEEN(in_dev)) 1551 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1552 else 1553 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1554 igmp_send_report(in_dev, im, type); 1555 } 1556 #endif 1557 } 1558 1559 /* 1560 * A socket has left a multicast group on device dev 1561 */ 1562 1563 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1564 { 1565 struct ip_mc_list *i; 1566 struct ip_mc_list __rcu **ip; 1567 1568 ASSERT_RTNL(); 1569 1570 for (ip = &in_dev->mc_list; 1571 (i = rtnl_dereference(*ip)) != NULL; 1572 ip = &i->next_rcu) { 1573 if (i->multiaddr == addr) { 1574 if (--i->users == 0) { 1575 ip_mc_hash_remove(in_dev, i); 1576 *ip = i->next_rcu; 1577 in_dev->mc_count--; 1578 igmp_group_dropped(i); 1579 ip_mc_clear_src(i); 1580 1581 if (!in_dev->dead) 1582 ip_rt_multicast_event(in_dev); 1583 1584 ip_ma_put(i); 1585 return; 1586 } 1587 break; 1588 } 1589 } 1590 } 1591 EXPORT_SYMBOL(ip_mc_dec_group); 1592 1593 /* Device changing type */ 1594 1595 void ip_mc_unmap(struct in_device *in_dev) 1596 { 1597 struct ip_mc_list *pmc; 1598 1599 ASSERT_RTNL(); 1600 1601 for_each_pmc_rtnl(in_dev, pmc) 1602 igmp_group_dropped(pmc); 1603 } 1604 1605 void ip_mc_remap(struct in_device *in_dev) 1606 { 1607 struct ip_mc_list *pmc; 1608 1609 ASSERT_RTNL(); 1610 1611 for_each_pmc_rtnl(in_dev, pmc) 1612 igmp_group_added(pmc); 1613 } 1614 1615 /* Device going down */ 1616 1617 void ip_mc_down(struct in_device *in_dev) 1618 { 1619 struct ip_mc_list *pmc; 1620 1621 ASSERT_RTNL(); 1622 1623 for_each_pmc_rtnl(in_dev, pmc) 1624 igmp_group_dropped(pmc); 1625 1626 #ifdef CONFIG_IP_MULTICAST 1627 in_dev->mr_ifc_count = 0; 1628 if (del_timer(&in_dev->mr_ifc_timer)) 1629 __in_dev_put(in_dev); 1630 in_dev->mr_gq_running = 0; 1631 if (del_timer(&in_dev->mr_gq_timer)) 1632 __in_dev_put(in_dev); 1633 igmpv3_clear_delrec(in_dev); 1634 #endif 1635 1636 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1637 } 1638 1639 void ip_mc_init_dev(struct in_device *in_dev) 1640 { 1641 ASSERT_RTNL(); 1642 1643 #ifdef CONFIG_IP_MULTICAST 1644 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1645 (unsigned long)in_dev); 1646 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1647 (unsigned long)in_dev); 1648 in_dev->mr_qrv = sysctl_igmp_qrv; 1649 #endif 1650 1651 spin_lock_init(&in_dev->mc_tomb_lock); 1652 } 1653 1654 /* Device going up */ 1655 1656 void ip_mc_up(struct in_device *in_dev) 1657 { 1658 struct ip_mc_list *pmc; 1659 1660 ASSERT_RTNL(); 1661 1662 #ifdef CONFIG_IP_MULTICAST 1663 in_dev->mr_qrv = sysctl_igmp_qrv; 1664 #endif 1665 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1666 1667 for_each_pmc_rtnl(in_dev, pmc) 1668 igmp_group_added(pmc); 1669 } 1670 1671 /* 1672 * Device is about to be destroyed: clean up. 1673 */ 1674 1675 void ip_mc_destroy_dev(struct in_device *in_dev) 1676 { 1677 struct ip_mc_list *i; 1678 1679 ASSERT_RTNL(); 1680 1681 /* Deactivate timers */ 1682 ip_mc_down(in_dev); 1683 1684 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1685 in_dev->mc_list = i->next_rcu; 1686 in_dev->mc_count--; 1687 1688 /* We've dropped the groups in ip_mc_down already */ 1689 ip_mc_clear_src(i); 1690 ip_ma_put(i); 1691 } 1692 } 1693 1694 /* RTNL is locked */ 1695 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1696 { 1697 struct net_device *dev = NULL; 1698 struct in_device *idev = NULL; 1699 1700 if (imr->imr_ifindex) { 1701 idev = inetdev_by_index(net, imr->imr_ifindex); 1702 return idev; 1703 } 1704 if (imr->imr_address.s_addr) { 1705 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1706 if (!dev) 1707 return NULL; 1708 } 1709 1710 if (!dev) { 1711 struct rtable *rt = ip_route_output(net, 1712 imr->imr_multiaddr.s_addr, 1713 0, 0, 0); 1714 if (!IS_ERR(rt)) { 1715 dev = rt->dst.dev; 1716 ip_rt_put(rt); 1717 } 1718 } 1719 if (dev) { 1720 imr->imr_ifindex = dev->ifindex; 1721 idev = __in_dev_get_rtnl(dev); 1722 } 1723 return idev; 1724 } 1725 1726 /* 1727 * Join a socket to a group 1728 */ 1729 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1730 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1731 #ifdef CONFIG_IP_MULTICAST 1732 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE; 1733 #endif 1734 1735 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1736 __be32 *psfsrc) 1737 { 1738 struct ip_sf_list *psf, *psf_prev; 1739 int rv = 0; 1740 1741 psf_prev = NULL; 1742 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1743 if (psf->sf_inaddr == *psfsrc) 1744 break; 1745 psf_prev = psf; 1746 } 1747 if (!psf || psf->sf_count[sfmode] == 0) { 1748 /* source filter not found, or count wrong => bug */ 1749 return -ESRCH; 1750 } 1751 psf->sf_count[sfmode]--; 1752 if (psf->sf_count[sfmode] == 0) { 1753 ip_rt_multicast_event(pmc->interface); 1754 } 1755 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1756 #ifdef CONFIG_IP_MULTICAST 1757 struct in_device *in_dev = pmc->interface; 1758 #endif 1759 1760 /* no more filters for this source */ 1761 if (psf_prev) 1762 psf_prev->sf_next = psf->sf_next; 1763 else 1764 pmc->sources = psf->sf_next; 1765 #ifdef CONFIG_IP_MULTICAST 1766 if (psf->sf_oldin && 1767 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1768 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1769 psf->sf_next = pmc->tomb; 1770 pmc->tomb = psf; 1771 rv = 1; 1772 } else 1773 #endif 1774 kfree(psf); 1775 } 1776 return rv; 1777 } 1778 1779 #ifndef CONFIG_IP_MULTICAST 1780 #define igmp_ifc_event(x) do { } while (0) 1781 #endif 1782 1783 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1784 int sfcount, __be32 *psfsrc, int delta) 1785 { 1786 struct ip_mc_list *pmc; 1787 int changerec = 0; 1788 int i, err; 1789 1790 if (!in_dev) 1791 return -ENODEV; 1792 rcu_read_lock(); 1793 for_each_pmc_rcu(in_dev, pmc) { 1794 if (*pmca == pmc->multiaddr) 1795 break; 1796 } 1797 if (!pmc) { 1798 /* MCA not found?? bug */ 1799 rcu_read_unlock(); 1800 return -ESRCH; 1801 } 1802 spin_lock_bh(&pmc->lock); 1803 rcu_read_unlock(); 1804 #ifdef CONFIG_IP_MULTICAST 1805 sf_markstate(pmc); 1806 #endif 1807 if (!delta) { 1808 err = -EINVAL; 1809 if (!pmc->sfcount[sfmode]) 1810 goto out_unlock; 1811 pmc->sfcount[sfmode]--; 1812 } 1813 err = 0; 1814 for (i = 0; i < sfcount; i++) { 1815 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1816 1817 changerec |= rv > 0; 1818 if (!err && rv < 0) 1819 err = rv; 1820 } 1821 if (pmc->sfmode == MCAST_EXCLUDE && 1822 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1823 pmc->sfcount[MCAST_INCLUDE]) { 1824 #ifdef CONFIG_IP_MULTICAST 1825 struct ip_sf_list *psf; 1826 #endif 1827 1828 /* filter mode change */ 1829 pmc->sfmode = MCAST_INCLUDE; 1830 #ifdef CONFIG_IP_MULTICAST 1831 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1832 in_dev->mr_ifc_count = pmc->crcount; 1833 for (psf = pmc->sources; psf; psf = psf->sf_next) 1834 psf->sf_crcount = 0; 1835 igmp_ifc_event(pmc->interface); 1836 } else if (sf_setstate(pmc) || changerec) { 1837 igmp_ifc_event(pmc->interface); 1838 #endif 1839 } 1840 out_unlock: 1841 spin_unlock_bh(&pmc->lock); 1842 return err; 1843 } 1844 1845 /* 1846 * Add multicast single-source filter to the interface list 1847 */ 1848 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1849 __be32 *psfsrc) 1850 { 1851 struct ip_sf_list *psf, *psf_prev; 1852 1853 psf_prev = NULL; 1854 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1855 if (psf->sf_inaddr == *psfsrc) 1856 break; 1857 psf_prev = psf; 1858 } 1859 if (!psf) { 1860 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1861 if (!psf) 1862 return -ENOBUFS; 1863 psf->sf_inaddr = *psfsrc; 1864 if (psf_prev) { 1865 psf_prev->sf_next = psf; 1866 } else 1867 pmc->sources = psf; 1868 } 1869 psf->sf_count[sfmode]++; 1870 if (psf->sf_count[sfmode] == 1) { 1871 ip_rt_multicast_event(pmc->interface); 1872 } 1873 return 0; 1874 } 1875 1876 #ifdef CONFIG_IP_MULTICAST 1877 static void sf_markstate(struct ip_mc_list *pmc) 1878 { 1879 struct ip_sf_list *psf; 1880 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1881 1882 for (psf = pmc->sources; psf; psf = psf->sf_next) 1883 if (pmc->sfcount[MCAST_EXCLUDE]) { 1884 psf->sf_oldin = mca_xcount == 1885 psf->sf_count[MCAST_EXCLUDE] && 1886 !psf->sf_count[MCAST_INCLUDE]; 1887 } else 1888 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1889 } 1890 1891 static int sf_setstate(struct ip_mc_list *pmc) 1892 { 1893 struct ip_sf_list *psf, *dpsf; 1894 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1895 int qrv = pmc->interface->mr_qrv; 1896 int new_in, rv; 1897 1898 rv = 0; 1899 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1900 if (pmc->sfcount[MCAST_EXCLUDE]) { 1901 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1902 !psf->sf_count[MCAST_INCLUDE]; 1903 } else 1904 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1905 if (new_in) { 1906 if (!psf->sf_oldin) { 1907 struct ip_sf_list *prev = NULL; 1908 1909 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 1910 if (dpsf->sf_inaddr == psf->sf_inaddr) 1911 break; 1912 prev = dpsf; 1913 } 1914 if (dpsf) { 1915 if (prev) 1916 prev->sf_next = dpsf->sf_next; 1917 else 1918 pmc->tomb = dpsf->sf_next; 1919 kfree(dpsf); 1920 } 1921 psf->sf_crcount = qrv; 1922 rv++; 1923 } 1924 } else if (psf->sf_oldin) { 1925 1926 psf->sf_crcount = 0; 1927 /* 1928 * add or update "delete" records if an active filter 1929 * is now inactive 1930 */ 1931 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 1932 if (dpsf->sf_inaddr == psf->sf_inaddr) 1933 break; 1934 if (!dpsf) { 1935 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1936 if (!dpsf) 1937 continue; 1938 *dpsf = *psf; 1939 /* pmc->lock held by callers */ 1940 dpsf->sf_next = pmc->tomb; 1941 pmc->tomb = dpsf; 1942 } 1943 dpsf->sf_crcount = qrv; 1944 rv++; 1945 } 1946 } 1947 return rv; 1948 } 1949 #endif 1950 1951 /* 1952 * Add multicast source filter list to the interface list 1953 */ 1954 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1955 int sfcount, __be32 *psfsrc, int delta) 1956 { 1957 struct ip_mc_list *pmc; 1958 int isexclude; 1959 int i, err; 1960 1961 if (!in_dev) 1962 return -ENODEV; 1963 rcu_read_lock(); 1964 for_each_pmc_rcu(in_dev, pmc) { 1965 if (*pmca == pmc->multiaddr) 1966 break; 1967 } 1968 if (!pmc) { 1969 /* MCA not found?? bug */ 1970 rcu_read_unlock(); 1971 return -ESRCH; 1972 } 1973 spin_lock_bh(&pmc->lock); 1974 rcu_read_unlock(); 1975 1976 #ifdef CONFIG_IP_MULTICAST 1977 sf_markstate(pmc); 1978 #endif 1979 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1980 if (!delta) 1981 pmc->sfcount[sfmode]++; 1982 err = 0; 1983 for (i = 0; i < sfcount; i++) { 1984 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1985 if (err) 1986 break; 1987 } 1988 if (err) { 1989 int j; 1990 1991 if (!delta) 1992 pmc->sfcount[sfmode]--; 1993 for (j = 0; j < i; j++) 1994 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1995 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1996 #ifdef CONFIG_IP_MULTICAST 1997 struct ip_sf_list *psf; 1998 in_dev = pmc->interface; 1999 #endif 2000 2001 /* filter mode change */ 2002 if (pmc->sfcount[MCAST_EXCLUDE]) 2003 pmc->sfmode = MCAST_EXCLUDE; 2004 else if (pmc->sfcount[MCAST_INCLUDE]) 2005 pmc->sfmode = MCAST_INCLUDE; 2006 #ifdef CONFIG_IP_MULTICAST 2007 /* else no filters; keep old mode for reports */ 2008 2009 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 2010 in_dev->mr_ifc_count = pmc->crcount; 2011 for (psf = pmc->sources; psf; psf = psf->sf_next) 2012 psf->sf_crcount = 0; 2013 igmp_ifc_event(in_dev); 2014 } else if (sf_setstate(pmc)) { 2015 igmp_ifc_event(in_dev); 2016 #endif 2017 } 2018 spin_unlock_bh(&pmc->lock); 2019 return err; 2020 } 2021 2022 static void ip_mc_clear_src(struct ip_mc_list *pmc) 2023 { 2024 struct ip_sf_list *psf, *nextpsf; 2025 2026 for (psf = pmc->tomb; psf; psf = nextpsf) { 2027 nextpsf = psf->sf_next; 2028 kfree(psf); 2029 } 2030 pmc->tomb = NULL; 2031 for (psf = pmc->sources; psf; psf = nextpsf) { 2032 nextpsf = psf->sf_next; 2033 kfree(psf); 2034 } 2035 pmc->sources = NULL; 2036 pmc->sfmode = MCAST_EXCLUDE; 2037 pmc->sfcount[MCAST_INCLUDE] = 0; 2038 pmc->sfcount[MCAST_EXCLUDE] = 1; 2039 } 2040 2041 /* Join a multicast group 2042 */ 2043 2044 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) 2045 { 2046 __be32 addr = imr->imr_multiaddr.s_addr; 2047 struct ip_mc_socklist *iml, *i; 2048 struct in_device *in_dev; 2049 struct inet_sock *inet = inet_sk(sk); 2050 struct net *net = sock_net(sk); 2051 int ifindex; 2052 int count = 0; 2053 int err; 2054 2055 ASSERT_RTNL(); 2056 2057 if (!ipv4_is_multicast(addr)) 2058 return -EINVAL; 2059 2060 in_dev = ip_mc_find_dev(net, imr); 2061 2062 if (!in_dev) { 2063 err = -ENODEV; 2064 goto done; 2065 } 2066 2067 err = -EADDRINUSE; 2068 ifindex = imr->imr_ifindex; 2069 for_each_pmc_rtnl(inet, i) { 2070 if (i->multi.imr_multiaddr.s_addr == addr && 2071 i->multi.imr_ifindex == ifindex) 2072 goto done; 2073 count++; 2074 } 2075 err = -ENOBUFS; 2076 if (count >= sysctl_igmp_max_memberships) 2077 goto done; 2078 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 2079 if (!iml) 2080 goto done; 2081 2082 memcpy(&iml->multi, imr, sizeof(*imr)); 2083 iml->next_rcu = inet->mc_list; 2084 iml->sflist = NULL; 2085 iml->sfmode = MCAST_EXCLUDE; 2086 rcu_assign_pointer(inet->mc_list, iml); 2087 ip_mc_inc_group(in_dev, addr); 2088 err = 0; 2089 done: 2090 return err; 2091 } 2092 EXPORT_SYMBOL(ip_mc_join_group); 2093 2094 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 2095 struct in_device *in_dev) 2096 { 2097 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 2098 int err; 2099 2100 if (!psf) { 2101 /* any-source empty exclude case */ 2102 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2103 iml->sfmode, 0, NULL, 0); 2104 } 2105 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2106 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 2107 RCU_INIT_POINTER(iml->sflist, NULL); 2108 /* decrease mem now to avoid the memleak warning */ 2109 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 2110 kfree_rcu(psf, rcu); 2111 return err; 2112 } 2113 2114 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 2115 { 2116 struct inet_sock *inet = inet_sk(sk); 2117 struct ip_mc_socklist *iml; 2118 struct ip_mc_socklist __rcu **imlp; 2119 struct in_device *in_dev; 2120 struct net *net = sock_net(sk); 2121 __be32 group = imr->imr_multiaddr.s_addr; 2122 u32 ifindex; 2123 int ret = -EADDRNOTAVAIL; 2124 2125 ASSERT_RTNL(); 2126 2127 in_dev = ip_mc_find_dev(net, imr); 2128 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { 2129 ret = -ENODEV; 2130 goto out; 2131 } 2132 ifindex = imr->imr_ifindex; 2133 for (imlp = &inet->mc_list; 2134 (iml = rtnl_dereference(*imlp)) != NULL; 2135 imlp = &iml->next_rcu) { 2136 if (iml->multi.imr_multiaddr.s_addr != group) 2137 continue; 2138 if (ifindex) { 2139 if (iml->multi.imr_ifindex != ifindex) 2140 continue; 2141 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 2142 iml->multi.imr_address.s_addr) 2143 continue; 2144 2145 (void) ip_mc_leave_src(sk, iml, in_dev); 2146 2147 *imlp = iml->next_rcu; 2148 2149 if (in_dev) 2150 ip_mc_dec_group(in_dev, group); 2151 2152 /* decrease mem now to avoid the memleak warning */ 2153 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2154 kfree_rcu(iml, rcu); 2155 return 0; 2156 } 2157 out: 2158 return ret; 2159 } 2160 EXPORT_SYMBOL(ip_mc_leave_group); 2161 2162 int ip_mc_source(int add, int omode, struct sock *sk, struct 2163 ip_mreq_source *mreqs, int ifindex) 2164 { 2165 int err; 2166 struct ip_mreqn imr; 2167 __be32 addr = mreqs->imr_multiaddr; 2168 struct ip_mc_socklist *pmc; 2169 struct in_device *in_dev = NULL; 2170 struct inet_sock *inet = inet_sk(sk); 2171 struct ip_sf_socklist *psl; 2172 struct net *net = sock_net(sk); 2173 int leavegroup = 0; 2174 int i, j, rv; 2175 2176 if (!ipv4_is_multicast(addr)) 2177 return -EINVAL; 2178 2179 ASSERT_RTNL(); 2180 2181 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2182 imr.imr_address.s_addr = mreqs->imr_interface; 2183 imr.imr_ifindex = ifindex; 2184 in_dev = ip_mc_find_dev(net, &imr); 2185 2186 if (!in_dev) { 2187 err = -ENODEV; 2188 goto done; 2189 } 2190 err = -EADDRNOTAVAIL; 2191 2192 for_each_pmc_rtnl(inet, pmc) { 2193 if ((pmc->multi.imr_multiaddr.s_addr == 2194 imr.imr_multiaddr.s_addr) && 2195 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2196 break; 2197 } 2198 if (!pmc) { /* must have a prior join */ 2199 err = -EINVAL; 2200 goto done; 2201 } 2202 /* if a source filter was set, must be the same mode as before */ 2203 if (pmc->sflist) { 2204 if (pmc->sfmode != omode) { 2205 err = -EINVAL; 2206 goto done; 2207 } 2208 } else if (pmc->sfmode != omode) { 2209 /* allow mode switches for empty-set filters */ 2210 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2211 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2212 NULL, 0); 2213 pmc->sfmode = omode; 2214 } 2215 2216 psl = rtnl_dereference(pmc->sflist); 2217 if (!add) { 2218 if (!psl) 2219 goto done; /* err = -EADDRNOTAVAIL */ 2220 rv = !0; 2221 for (i = 0; i < psl->sl_count; i++) { 2222 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2223 sizeof(__be32)); 2224 if (rv == 0) 2225 break; 2226 } 2227 if (rv) /* source not found */ 2228 goto done; /* err = -EADDRNOTAVAIL */ 2229 2230 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2231 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2232 leavegroup = 1; 2233 goto done; 2234 } 2235 2236 /* update the interface filter */ 2237 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2238 &mreqs->imr_sourceaddr, 1); 2239 2240 for (j = i+1; j < psl->sl_count; j++) 2241 psl->sl_addr[j-1] = psl->sl_addr[j]; 2242 psl->sl_count--; 2243 err = 0; 2244 goto done; 2245 } 2246 /* else, add a new source to the filter */ 2247 2248 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 2249 err = -ENOBUFS; 2250 goto done; 2251 } 2252 if (!psl || psl->sl_count == psl->sl_max) { 2253 struct ip_sf_socklist *newpsl; 2254 int count = IP_SFBLOCK; 2255 2256 if (psl) 2257 count += psl->sl_max; 2258 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2259 if (!newpsl) { 2260 err = -ENOBUFS; 2261 goto done; 2262 } 2263 newpsl->sl_max = count; 2264 newpsl->sl_count = count - IP_SFBLOCK; 2265 if (psl) { 2266 for (i = 0; i < psl->sl_count; i++) 2267 newpsl->sl_addr[i] = psl->sl_addr[i]; 2268 /* decrease mem now to avoid the memleak warning */ 2269 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2270 kfree_rcu(psl, rcu); 2271 } 2272 rcu_assign_pointer(pmc->sflist, newpsl); 2273 psl = newpsl; 2274 } 2275 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2276 for (i = 0; i < psl->sl_count; i++) { 2277 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2278 sizeof(__be32)); 2279 if (rv == 0) 2280 break; 2281 } 2282 if (rv == 0) /* address already there is an error */ 2283 goto done; 2284 for (j = psl->sl_count-1; j >= i; j--) 2285 psl->sl_addr[j+1] = psl->sl_addr[j]; 2286 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2287 psl->sl_count++; 2288 err = 0; 2289 /* update the interface list */ 2290 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2291 &mreqs->imr_sourceaddr, 1); 2292 done: 2293 if (leavegroup) 2294 err = ip_mc_leave_group(sk, &imr); 2295 return err; 2296 } 2297 2298 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2299 { 2300 int err = 0; 2301 struct ip_mreqn imr; 2302 __be32 addr = msf->imsf_multiaddr; 2303 struct ip_mc_socklist *pmc; 2304 struct in_device *in_dev; 2305 struct inet_sock *inet = inet_sk(sk); 2306 struct ip_sf_socklist *newpsl, *psl; 2307 struct net *net = sock_net(sk); 2308 int leavegroup = 0; 2309 2310 if (!ipv4_is_multicast(addr)) 2311 return -EINVAL; 2312 if (msf->imsf_fmode != MCAST_INCLUDE && 2313 msf->imsf_fmode != MCAST_EXCLUDE) 2314 return -EINVAL; 2315 2316 ASSERT_RTNL(); 2317 2318 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2319 imr.imr_address.s_addr = msf->imsf_interface; 2320 imr.imr_ifindex = ifindex; 2321 in_dev = ip_mc_find_dev(net, &imr); 2322 2323 if (!in_dev) { 2324 err = -ENODEV; 2325 goto done; 2326 } 2327 2328 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2329 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2330 leavegroup = 1; 2331 goto done; 2332 } 2333 2334 for_each_pmc_rtnl(inet, pmc) { 2335 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2336 pmc->multi.imr_ifindex == imr.imr_ifindex) 2337 break; 2338 } 2339 if (!pmc) { /* must have a prior join */ 2340 err = -EINVAL; 2341 goto done; 2342 } 2343 if (msf->imsf_numsrc) { 2344 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2345 GFP_KERNEL); 2346 if (!newpsl) { 2347 err = -ENOBUFS; 2348 goto done; 2349 } 2350 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2351 memcpy(newpsl->sl_addr, msf->imsf_slist, 2352 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2353 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2354 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2355 if (err) { 2356 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2357 goto done; 2358 } 2359 } else { 2360 newpsl = NULL; 2361 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2362 msf->imsf_fmode, 0, NULL, 0); 2363 } 2364 psl = rtnl_dereference(pmc->sflist); 2365 if (psl) { 2366 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2367 psl->sl_count, psl->sl_addr, 0); 2368 /* decrease mem now to avoid the memleak warning */ 2369 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2370 kfree_rcu(psl, rcu); 2371 } else 2372 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2373 0, NULL, 0); 2374 rcu_assign_pointer(pmc->sflist, newpsl); 2375 pmc->sfmode = msf->imsf_fmode; 2376 err = 0; 2377 done: 2378 if (leavegroup) 2379 err = ip_mc_leave_group(sk, &imr); 2380 return err; 2381 } 2382 2383 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2384 struct ip_msfilter __user *optval, int __user *optlen) 2385 { 2386 int err, len, count, copycount; 2387 struct ip_mreqn imr; 2388 __be32 addr = msf->imsf_multiaddr; 2389 struct ip_mc_socklist *pmc; 2390 struct in_device *in_dev; 2391 struct inet_sock *inet = inet_sk(sk); 2392 struct ip_sf_socklist *psl; 2393 struct net *net = sock_net(sk); 2394 2395 ASSERT_RTNL(); 2396 2397 if (!ipv4_is_multicast(addr)) 2398 return -EINVAL; 2399 2400 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2401 imr.imr_address.s_addr = msf->imsf_interface; 2402 imr.imr_ifindex = 0; 2403 in_dev = ip_mc_find_dev(net, &imr); 2404 2405 if (!in_dev) { 2406 err = -ENODEV; 2407 goto done; 2408 } 2409 err = -EADDRNOTAVAIL; 2410 2411 for_each_pmc_rtnl(inet, pmc) { 2412 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2413 pmc->multi.imr_ifindex == imr.imr_ifindex) 2414 break; 2415 } 2416 if (!pmc) /* must have a prior join */ 2417 goto done; 2418 msf->imsf_fmode = pmc->sfmode; 2419 psl = rtnl_dereference(pmc->sflist); 2420 if (!psl) { 2421 len = 0; 2422 count = 0; 2423 } else { 2424 count = psl->sl_count; 2425 } 2426 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2427 len = copycount * sizeof(psl->sl_addr[0]); 2428 msf->imsf_numsrc = count; 2429 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2430 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2431 return -EFAULT; 2432 } 2433 if (len && 2434 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2435 return -EFAULT; 2436 return 0; 2437 done: 2438 return err; 2439 } 2440 2441 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2442 struct group_filter __user *optval, int __user *optlen) 2443 { 2444 int err, i, count, copycount; 2445 struct sockaddr_in *psin; 2446 __be32 addr; 2447 struct ip_mc_socklist *pmc; 2448 struct inet_sock *inet = inet_sk(sk); 2449 struct ip_sf_socklist *psl; 2450 2451 ASSERT_RTNL(); 2452 2453 psin = (struct sockaddr_in *)&gsf->gf_group; 2454 if (psin->sin_family != AF_INET) 2455 return -EINVAL; 2456 addr = psin->sin_addr.s_addr; 2457 if (!ipv4_is_multicast(addr)) 2458 return -EINVAL; 2459 2460 err = -EADDRNOTAVAIL; 2461 2462 for_each_pmc_rtnl(inet, pmc) { 2463 if (pmc->multi.imr_multiaddr.s_addr == addr && 2464 pmc->multi.imr_ifindex == gsf->gf_interface) 2465 break; 2466 } 2467 if (!pmc) /* must have a prior join */ 2468 goto done; 2469 gsf->gf_fmode = pmc->sfmode; 2470 psl = rtnl_dereference(pmc->sflist); 2471 count = psl ? psl->sl_count : 0; 2472 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2473 gsf->gf_numsrc = count; 2474 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2475 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2476 return -EFAULT; 2477 } 2478 for (i = 0; i < copycount; i++) { 2479 struct sockaddr_storage ss; 2480 2481 psin = (struct sockaddr_in *)&ss; 2482 memset(&ss, 0, sizeof(ss)); 2483 psin->sin_family = AF_INET; 2484 psin->sin_addr.s_addr = psl->sl_addr[i]; 2485 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2486 return -EFAULT; 2487 } 2488 return 0; 2489 done: 2490 return err; 2491 } 2492 2493 /* 2494 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2495 */ 2496 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2497 { 2498 struct inet_sock *inet = inet_sk(sk); 2499 struct ip_mc_socklist *pmc; 2500 struct ip_sf_socklist *psl; 2501 int i; 2502 int ret; 2503 2504 ret = 1; 2505 if (!ipv4_is_multicast(loc_addr)) 2506 goto out; 2507 2508 rcu_read_lock(); 2509 for_each_pmc_rcu(inet, pmc) { 2510 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2511 pmc->multi.imr_ifindex == dif) 2512 break; 2513 } 2514 ret = inet->mc_all; 2515 if (!pmc) 2516 goto unlock; 2517 psl = rcu_dereference(pmc->sflist); 2518 ret = (pmc->sfmode == MCAST_EXCLUDE); 2519 if (!psl) 2520 goto unlock; 2521 2522 for (i = 0; i < psl->sl_count; i++) { 2523 if (psl->sl_addr[i] == rmt_addr) 2524 break; 2525 } 2526 ret = 0; 2527 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2528 goto unlock; 2529 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2530 goto unlock; 2531 ret = 1; 2532 unlock: 2533 rcu_read_unlock(); 2534 out: 2535 return ret; 2536 } 2537 2538 /* 2539 * A socket is closing. 2540 */ 2541 2542 void ip_mc_drop_socket(struct sock *sk) 2543 { 2544 struct inet_sock *inet = inet_sk(sk); 2545 struct ip_mc_socklist *iml; 2546 struct net *net = sock_net(sk); 2547 2548 if (!inet->mc_list) 2549 return; 2550 2551 rtnl_lock(); 2552 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2553 struct in_device *in_dev; 2554 2555 inet->mc_list = iml->next_rcu; 2556 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2557 (void) ip_mc_leave_src(sk, iml, in_dev); 2558 if (in_dev) 2559 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2560 /* decrease mem now to avoid the memleak warning */ 2561 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2562 kfree_rcu(iml, rcu); 2563 } 2564 rtnl_unlock(); 2565 } 2566 2567 /* called with rcu_read_lock() */ 2568 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) 2569 { 2570 struct ip_mc_list *im; 2571 struct ip_mc_list __rcu **mc_hash; 2572 struct ip_sf_list *psf; 2573 int rv = 0; 2574 2575 mc_hash = rcu_dereference(in_dev->mc_hash); 2576 if (mc_hash) { 2577 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2578 2579 for (im = rcu_dereference(mc_hash[hash]); 2580 im != NULL; 2581 im = rcu_dereference(im->next_hash)) { 2582 if (im->multiaddr == mc_addr) 2583 break; 2584 } 2585 } else { 2586 for_each_pmc_rcu(in_dev, im) { 2587 if (im->multiaddr == mc_addr) 2588 break; 2589 } 2590 } 2591 if (im && proto == IPPROTO_IGMP) { 2592 rv = 1; 2593 } else if (im) { 2594 if (src_addr) { 2595 for (psf = im->sources; psf; psf = psf->sf_next) { 2596 if (psf->sf_inaddr == src_addr) 2597 break; 2598 } 2599 if (psf) 2600 rv = psf->sf_count[MCAST_INCLUDE] || 2601 psf->sf_count[MCAST_EXCLUDE] != 2602 im->sfcount[MCAST_EXCLUDE]; 2603 else 2604 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2605 } else 2606 rv = 1; /* unspecified source; tentatively allow */ 2607 } 2608 return rv; 2609 } 2610 2611 #if defined(CONFIG_PROC_FS) 2612 struct igmp_mc_iter_state { 2613 struct seq_net_private p; 2614 struct net_device *dev; 2615 struct in_device *in_dev; 2616 }; 2617 2618 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2619 2620 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2621 { 2622 struct net *net = seq_file_net(seq); 2623 struct ip_mc_list *im = NULL; 2624 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2625 2626 state->in_dev = NULL; 2627 for_each_netdev_rcu(net, state->dev) { 2628 struct in_device *in_dev; 2629 2630 in_dev = __in_dev_get_rcu(state->dev); 2631 if (!in_dev) 2632 continue; 2633 im = rcu_dereference(in_dev->mc_list); 2634 if (im) { 2635 state->in_dev = in_dev; 2636 break; 2637 } 2638 } 2639 return im; 2640 } 2641 2642 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2643 { 2644 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2645 2646 im = rcu_dereference(im->next_rcu); 2647 while (!im) { 2648 state->dev = next_net_device_rcu(state->dev); 2649 if (!state->dev) { 2650 state->in_dev = NULL; 2651 break; 2652 } 2653 state->in_dev = __in_dev_get_rcu(state->dev); 2654 if (!state->in_dev) 2655 continue; 2656 im = rcu_dereference(state->in_dev->mc_list); 2657 } 2658 return im; 2659 } 2660 2661 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2662 { 2663 struct ip_mc_list *im = igmp_mc_get_first(seq); 2664 if (im) 2665 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2666 --pos; 2667 return pos ? NULL : im; 2668 } 2669 2670 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2671 __acquires(rcu) 2672 { 2673 rcu_read_lock(); 2674 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2675 } 2676 2677 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2678 { 2679 struct ip_mc_list *im; 2680 if (v == SEQ_START_TOKEN) 2681 im = igmp_mc_get_first(seq); 2682 else 2683 im = igmp_mc_get_next(seq, v); 2684 ++*pos; 2685 return im; 2686 } 2687 2688 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2689 __releases(rcu) 2690 { 2691 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2692 2693 state->in_dev = NULL; 2694 state->dev = NULL; 2695 rcu_read_unlock(); 2696 } 2697 2698 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2699 { 2700 if (v == SEQ_START_TOKEN) 2701 seq_puts(seq, 2702 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2703 else { 2704 struct ip_mc_list *im = (struct ip_mc_list *)v; 2705 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2706 char *querier; 2707 long delta; 2708 2709 #ifdef CONFIG_IP_MULTICAST 2710 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2711 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2712 "V3"; 2713 #else 2714 querier = "NONE"; 2715 #endif 2716 2717 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2718 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2719 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2720 } 2721 2722 delta = im->timer.expires - jiffies; 2723 seq_printf(seq, 2724 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2725 im->multiaddr, im->users, 2726 im->tm_running, 2727 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2728 im->reporter); 2729 } 2730 return 0; 2731 } 2732 2733 static const struct seq_operations igmp_mc_seq_ops = { 2734 .start = igmp_mc_seq_start, 2735 .next = igmp_mc_seq_next, 2736 .stop = igmp_mc_seq_stop, 2737 .show = igmp_mc_seq_show, 2738 }; 2739 2740 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2741 { 2742 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2743 sizeof(struct igmp_mc_iter_state)); 2744 } 2745 2746 static const struct file_operations igmp_mc_seq_fops = { 2747 .owner = THIS_MODULE, 2748 .open = igmp_mc_seq_open, 2749 .read = seq_read, 2750 .llseek = seq_lseek, 2751 .release = seq_release_net, 2752 }; 2753 2754 struct igmp_mcf_iter_state { 2755 struct seq_net_private p; 2756 struct net_device *dev; 2757 struct in_device *idev; 2758 struct ip_mc_list *im; 2759 }; 2760 2761 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2762 2763 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2764 { 2765 struct net *net = seq_file_net(seq); 2766 struct ip_sf_list *psf = NULL; 2767 struct ip_mc_list *im = NULL; 2768 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2769 2770 state->idev = NULL; 2771 state->im = NULL; 2772 for_each_netdev_rcu(net, state->dev) { 2773 struct in_device *idev; 2774 idev = __in_dev_get_rcu(state->dev); 2775 if (unlikely(!idev)) 2776 continue; 2777 im = rcu_dereference(idev->mc_list); 2778 if (likely(im)) { 2779 spin_lock_bh(&im->lock); 2780 psf = im->sources; 2781 if (likely(psf)) { 2782 state->im = im; 2783 state->idev = idev; 2784 break; 2785 } 2786 spin_unlock_bh(&im->lock); 2787 } 2788 } 2789 return psf; 2790 } 2791 2792 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2793 { 2794 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2795 2796 psf = psf->sf_next; 2797 while (!psf) { 2798 spin_unlock_bh(&state->im->lock); 2799 state->im = state->im->next; 2800 while (!state->im) { 2801 state->dev = next_net_device_rcu(state->dev); 2802 if (!state->dev) { 2803 state->idev = NULL; 2804 goto out; 2805 } 2806 state->idev = __in_dev_get_rcu(state->dev); 2807 if (!state->idev) 2808 continue; 2809 state->im = rcu_dereference(state->idev->mc_list); 2810 } 2811 if (!state->im) 2812 break; 2813 spin_lock_bh(&state->im->lock); 2814 psf = state->im->sources; 2815 } 2816 out: 2817 return psf; 2818 } 2819 2820 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2821 { 2822 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2823 if (psf) 2824 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2825 --pos; 2826 return pos ? NULL : psf; 2827 } 2828 2829 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2830 __acquires(rcu) 2831 { 2832 rcu_read_lock(); 2833 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2834 } 2835 2836 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2837 { 2838 struct ip_sf_list *psf; 2839 if (v == SEQ_START_TOKEN) 2840 psf = igmp_mcf_get_first(seq); 2841 else 2842 psf = igmp_mcf_get_next(seq, v); 2843 ++*pos; 2844 return psf; 2845 } 2846 2847 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2848 __releases(rcu) 2849 { 2850 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2851 if (likely(state->im)) { 2852 spin_unlock_bh(&state->im->lock); 2853 state->im = NULL; 2854 } 2855 state->idev = NULL; 2856 state->dev = NULL; 2857 rcu_read_unlock(); 2858 } 2859 2860 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2861 { 2862 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2863 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2864 2865 if (v == SEQ_START_TOKEN) { 2866 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2867 } else { 2868 seq_printf(seq, 2869 "%3d %6.6s 0x%08x " 2870 "0x%08x %6lu %6lu\n", 2871 state->dev->ifindex, state->dev->name, 2872 ntohl(state->im->multiaddr), 2873 ntohl(psf->sf_inaddr), 2874 psf->sf_count[MCAST_INCLUDE], 2875 psf->sf_count[MCAST_EXCLUDE]); 2876 } 2877 return 0; 2878 } 2879 2880 static const struct seq_operations igmp_mcf_seq_ops = { 2881 .start = igmp_mcf_seq_start, 2882 .next = igmp_mcf_seq_next, 2883 .stop = igmp_mcf_seq_stop, 2884 .show = igmp_mcf_seq_show, 2885 }; 2886 2887 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2888 { 2889 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2890 sizeof(struct igmp_mcf_iter_state)); 2891 } 2892 2893 static const struct file_operations igmp_mcf_seq_fops = { 2894 .owner = THIS_MODULE, 2895 .open = igmp_mcf_seq_open, 2896 .read = seq_read, 2897 .llseek = seq_lseek, 2898 .release = seq_release_net, 2899 }; 2900 2901 static int __net_init igmp_net_init(struct net *net) 2902 { 2903 struct proc_dir_entry *pde; 2904 int err; 2905 2906 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); 2907 if (!pde) 2908 goto out_igmp; 2909 pde = proc_create("mcfilter", S_IRUGO, net->proc_net, 2910 &igmp_mcf_seq_fops); 2911 if (!pde) 2912 goto out_mcfilter; 2913 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, 2914 SOCK_DGRAM, 0, net); 2915 if (err < 0) { 2916 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", 2917 err); 2918 goto out_sock; 2919 } 2920 2921 return 0; 2922 2923 out_sock: 2924 remove_proc_entry("mcfilter", net->proc_net); 2925 out_mcfilter: 2926 remove_proc_entry("igmp", net->proc_net); 2927 out_igmp: 2928 return -ENOMEM; 2929 } 2930 2931 static void __net_exit igmp_net_exit(struct net *net) 2932 { 2933 remove_proc_entry("mcfilter", net->proc_net); 2934 remove_proc_entry("igmp", net->proc_net); 2935 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); 2936 } 2937 2938 static struct pernet_operations igmp_net_ops = { 2939 .init = igmp_net_init, 2940 .exit = igmp_net_exit, 2941 }; 2942 #endif 2943 2944 static int igmp_netdev_event(struct notifier_block *this, 2945 unsigned long event, void *ptr) 2946 { 2947 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2948 struct in_device *in_dev; 2949 2950 switch (event) { 2951 case NETDEV_RESEND_IGMP: 2952 in_dev = __in_dev_get_rtnl(dev); 2953 if (in_dev) 2954 ip_mc_rejoin_groups(in_dev); 2955 break; 2956 default: 2957 break; 2958 } 2959 return NOTIFY_DONE; 2960 } 2961 2962 static struct notifier_block igmp_notifier = { 2963 .notifier_call = igmp_netdev_event, 2964 }; 2965 2966 int __init igmp_mc_init(void) 2967 { 2968 #if defined(CONFIG_PROC_FS) 2969 int err; 2970 2971 err = register_pernet_subsys(&igmp_net_ops); 2972 if (err) 2973 return err; 2974 err = register_netdevice_notifier(&igmp_notifier); 2975 if (err) 2976 goto reg_notif_fail; 2977 return 0; 2978 2979 reg_notif_fail: 2980 unregister_pernet_subsys(&igmp_net_ops); 2981 return err; 2982 #else 2983 return register_netdevice_notifier(&igmp_notifier); 2984 #endif 2985 } 2986