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 <linux/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 #include <linux/byteorder/generic.h> 93 94 #include <net/net_namespace.h> 95 #include <net/arp.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/route.h> 99 #include <net/sock.h> 100 #include <net/checksum.h> 101 #include <net/inet_common.h> 102 #include <linux/netfilter_ipv4.h> 103 #ifdef CONFIG_IP_MROUTE 104 #include <linux/mroute.h> 105 #endif 106 #ifdef CONFIG_PROC_FS 107 #include <linux/proc_fs.h> 108 #include <linux/seq_file.h> 109 #endif 110 111 #ifdef CONFIG_IP_MULTICAST 112 /* Parameter names and values are taken from igmp-v2-06 draft */ 113 114 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) 115 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) 116 #define IGMP_QUERY_INTERVAL (125*HZ) 117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) 118 119 #define IGMP_INITIAL_REPORT_DELAY (1) 120 121 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! 122 * IGMP specs require to report membership immediately after 123 * joining a group, but we delay the first report by a 124 * small interval. It seems more natural and still does not 125 * contradict to specs provided this delay is small enough. 126 */ 127 128 #define IGMP_V1_SEEN(in_dev) \ 129 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 130 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 131 ((in_dev)->mr_v1_seen && \ 132 time_before(jiffies, (in_dev)->mr_v1_seen))) 133 #define IGMP_V2_SEEN(in_dev) \ 134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 136 ((in_dev)->mr_v2_seen && \ 137 time_before(jiffies, (in_dev)->mr_v2_seen))) 138 139 static int unsolicited_report_interval(struct in_device *in_dev) 140 { 141 int interval_ms, interval_jiffies; 142 143 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 144 interval_ms = IN_DEV_CONF_GET( 145 in_dev, 146 IGMPV2_UNSOLICITED_REPORT_INTERVAL); 147 else /* v3 */ 148 interval_ms = IN_DEV_CONF_GET( 149 in_dev, 150 IGMPV3_UNSOLICITED_REPORT_INTERVAL); 151 152 interval_jiffies = msecs_to_jiffies(interval_ms); 153 154 /* _timer functions can't handle a delay of 0 jiffies so ensure 155 * we always return a positive value. 156 */ 157 if (interval_jiffies <= 0) 158 interval_jiffies = 1; 159 return interval_jiffies; 160 } 161 162 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, 163 gfp_t gfp); 164 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); 165 static void igmpv3_clear_delrec(struct in_device *in_dev); 166 static int sf_setstate(struct ip_mc_list *pmc); 167 static void sf_markstate(struct ip_mc_list *pmc); 168 #endif 169 static void ip_mc_clear_src(struct ip_mc_list *pmc); 170 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 171 int sfcount, __be32 *psfsrc, int delta); 172 173 static void ip_ma_put(struct ip_mc_list *im) 174 { 175 if (refcount_dec_and_test(&im->refcnt)) { 176 in_dev_put(im->interface); 177 kfree_rcu(im, rcu); 178 } 179 } 180 181 #define for_each_pmc_rcu(in_dev, pmc) \ 182 for (pmc = rcu_dereference(in_dev->mc_list); \ 183 pmc != NULL; \ 184 pmc = rcu_dereference(pmc->next_rcu)) 185 186 #define for_each_pmc_rtnl(in_dev, pmc) \ 187 for (pmc = rtnl_dereference(in_dev->mc_list); \ 188 pmc != NULL; \ 189 pmc = rtnl_dereference(pmc->next_rcu)) 190 191 #ifdef CONFIG_IP_MULTICAST 192 193 /* 194 * Timer management 195 */ 196 197 static void igmp_stop_timer(struct ip_mc_list *im) 198 { 199 spin_lock_bh(&im->lock); 200 if (del_timer(&im->timer)) 201 refcount_dec(&im->refcnt); 202 im->tm_running = 0; 203 im->reporter = 0; 204 im->unsolicit_count = 0; 205 spin_unlock_bh(&im->lock); 206 } 207 208 /* It must be called with locked im->lock */ 209 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 210 { 211 int tv = prandom_u32() % max_delay; 212 213 im->tm_running = 1; 214 if (!mod_timer(&im->timer, jiffies+tv+2)) 215 refcount_inc(&im->refcnt); 216 } 217 218 static void igmp_gq_start_timer(struct in_device *in_dev) 219 { 220 int tv = prandom_u32() % in_dev->mr_maxdelay; 221 unsigned long exp = jiffies + tv + 2; 222 223 if (in_dev->mr_gq_running && 224 time_after_eq(exp, (in_dev->mr_gq_timer).expires)) 225 return; 226 227 in_dev->mr_gq_running = 1; 228 if (!mod_timer(&in_dev->mr_gq_timer, exp)) 229 in_dev_hold(in_dev); 230 } 231 232 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 233 { 234 int tv = prandom_u32() % delay; 235 236 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 237 in_dev_hold(in_dev); 238 } 239 240 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 241 { 242 spin_lock_bh(&im->lock); 243 im->unsolicit_count = 0; 244 if (del_timer(&im->timer)) { 245 if ((long)(im->timer.expires-jiffies) < max_delay) { 246 add_timer(&im->timer); 247 im->tm_running = 1; 248 spin_unlock_bh(&im->lock); 249 return; 250 } 251 refcount_dec(&im->refcnt); 252 } 253 igmp_start_timer(im, max_delay); 254 spin_unlock_bh(&im->lock); 255 } 256 257 258 /* 259 * Send an IGMP report. 260 */ 261 262 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 263 264 265 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 266 int gdeleted, int sdeleted) 267 { 268 switch (type) { 269 case IGMPV3_MODE_IS_INCLUDE: 270 case IGMPV3_MODE_IS_EXCLUDE: 271 if (gdeleted || sdeleted) 272 return 0; 273 if (!(pmc->gsquery && !psf->sf_gsresp)) { 274 if (pmc->sfmode == MCAST_INCLUDE) 275 return 1; 276 /* don't include if this source is excluded 277 * in all filters 278 */ 279 if (psf->sf_count[MCAST_INCLUDE]) 280 return type == IGMPV3_MODE_IS_INCLUDE; 281 return pmc->sfcount[MCAST_EXCLUDE] == 282 psf->sf_count[MCAST_EXCLUDE]; 283 } 284 return 0; 285 case IGMPV3_CHANGE_TO_INCLUDE: 286 if (gdeleted || sdeleted) 287 return 0; 288 return psf->sf_count[MCAST_INCLUDE] != 0; 289 case IGMPV3_CHANGE_TO_EXCLUDE: 290 if (gdeleted || sdeleted) 291 return 0; 292 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 293 psf->sf_count[MCAST_INCLUDE]) 294 return 0; 295 return pmc->sfcount[MCAST_EXCLUDE] == 296 psf->sf_count[MCAST_EXCLUDE]; 297 case IGMPV3_ALLOW_NEW_SOURCES: 298 if (gdeleted || !psf->sf_crcount) 299 return 0; 300 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 301 case IGMPV3_BLOCK_OLD_SOURCES: 302 if (pmc->sfmode == MCAST_INCLUDE) 303 return gdeleted || (psf->sf_crcount && sdeleted); 304 return psf->sf_crcount && !gdeleted && !sdeleted; 305 } 306 return 0; 307 } 308 309 static int 310 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 311 { 312 struct ip_sf_list *psf; 313 int scount = 0; 314 315 for (psf = pmc->sources; psf; psf = psf->sf_next) { 316 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 317 continue; 318 scount++; 319 } 320 return scount; 321 } 322 323 /* source address selection per RFC 3376 section 4.2.13 */ 324 static __be32 igmpv3_get_srcaddr(struct net_device *dev, 325 const struct flowi4 *fl4) 326 { 327 struct in_device *in_dev = __in_dev_get_rcu(dev); 328 329 if (!in_dev) 330 return htonl(INADDR_ANY); 331 332 for_ifa(in_dev) { 333 if (fl4->saddr == ifa->ifa_local) 334 return fl4->saddr; 335 } endfor_ifa(in_dev); 336 337 return htonl(INADDR_ANY); 338 } 339 340 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) 341 { 342 struct sk_buff *skb; 343 struct rtable *rt; 344 struct iphdr *pip; 345 struct igmpv3_report *pig; 346 struct net *net = dev_net(dev); 347 struct flowi4 fl4; 348 int hlen = LL_RESERVED_SPACE(dev); 349 int tlen = dev->needed_tailroom; 350 unsigned int size = mtu; 351 352 while (1) { 353 skb = alloc_skb(size + hlen + tlen, 354 GFP_ATOMIC | __GFP_NOWARN); 355 if (skb) 356 break; 357 size >>= 1; 358 if (size < 256) 359 return NULL; 360 } 361 skb->priority = TC_PRIO_CONTROL; 362 363 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 364 0, 0, 365 IPPROTO_IGMP, 0, dev->ifindex); 366 if (IS_ERR(rt)) { 367 kfree_skb(skb); 368 return NULL; 369 } 370 371 skb_dst_set(skb, &rt->dst); 372 skb->dev = dev; 373 374 skb_reserve(skb, hlen); 375 skb_tailroom_reserve(skb, mtu, tlen); 376 377 skb_reset_network_header(skb); 378 pip = ip_hdr(skb); 379 skb_put(skb, sizeof(struct iphdr) + 4); 380 381 pip->version = 4; 382 pip->ihl = (sizeof(struct iphdr)+4)>>2; 383 pip->tos = 0xc0; 384 pip->frag_off = htons(IP_DF); 385 pip->ttl = 1; 386 pip->daddr = fl4.daddr; 387 388 rcu_read_lock(); 389 pip->saddr = igmpv3_get_srcaddr(dev, &fl4); 390 rcu_read_unlock(); 391 392 pip->protocol = IPPROTO_IGMP; 393 pip->tot_len = 0; /* filled in later */ 394 ip_select_ident(net, skb, NULL); 395 ((u8 *)&pip[1])[0] = IPOPT_RA; 396 ((u8 *)&pip[1])[1] = 4; 397 ((u8 *)&pip[1])[2] = 0; 398 ((u8 *)&pip[1])[3] = 0; 399 400 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 401 skb_put(skb, sizeof(*pig)); 402 pig = igmpv3_report_hdr(skb); 403 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 404 pig->resv1 = 0; 405 pig->csum = 0; 406 pig->resv2 = 0; 407 pig->ngrec = 0; 408 return skb; 409 } 410 411 static int igmpv3_sendpack(struct sk_buff *skb) 412 { 413 struct igmphdr *pig = igmp_hdr(skb); 414 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); 415 416 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 417 418 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 419 } 420 421 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 422 { 423 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 424 } 425 426 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 427 int type, struct igmpv3_grec **ppgr, unsigned int mtu) 428 { 429 struct net_device *dev = pmc->interface->dev; 430 struct igmpv3_report *pih; 431 struct igmpv3_grec *pgr; 432 433 if (!skb) { 434 skb = igmpv3_newpack(dev, mtu); 435 if (!skb) 436 return NULL; 437 } 438 pgr = skb_put(skb, sizeof(struct igmpv3_grec)); 439 pgr->grec_type = type; 440 pgr->grec_auxwords = 0; 441 pgr->grec_nsrcs = 0; 442 pgr->grec_mca = pmc->multiaddr; 443 pih = igmpv3_report_hdr(skb); 444 pih->ngrec = htons(ntohs(pih->ngrec)+1); 445 *ppgr = pgr; 446 return skb; 447 } 448 449 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 450 451 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 452 int type, int gdeleted, int sdeleted) 453 { 454 struct net_device *dev = pmc->interface->dev; 455 struct net *net = dev_net(dev); 456 struct igmpv3_report *pih; 457 struct igmpv3_grec *pgr = NULL; 458 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 459 int scount, stotal, first, isquery, truncate; 460 unsigned int mtu; 461 462 if (pmc->multiaddr == IGMP_ALL_HOSTS) 463 return skb; 464 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 465 return skb; 466 467 mtu = READ_ONCE(dev->mtu); 468 if (mtu < IPV4_MIN_MTU) 469 return skb; 470 471 isquery = type == IGMPV3_MODE_IS_INCLUDE || 472 type == IGMPV3_MODE_IS_EXCLUDE; 473 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 474 type == IGMPV3_CHANGE_TO_EXCLUDE; 475 476 stotal = scount = 0; 477 478 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 479 480 if (!*psf_list) 481 goto empty_source; 482 483 pih = skb ? igmpv3_report_hdr(skb) : NULL; 484 485 /* EX and TO_EX get a fresh packet, if needed */ 486 if (truncate) { 487 if (pih && pih->ngrec && 488 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 489 if (skb) 490 igmpv3_sendpack(skb); 491 skb = igmpv3_newpack(dev, mtu); 492 } 493 } 494 first = 1; 495 psf_prev = NULL; 496 for (psf = *psf_list; psf; psf = psf_next) { 497 __be32 *psrc; 498 499 psf_next = psf->sf_next; 500 501 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 502 psf_prev = psf; 503 continue; 504 } 505 506 /* Based on RFC3376 5.1. Should not send source-list change 507 * records when there is a filter mode change. 508 */ 509 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || 510 (!gdeleted && pmc->crcount)) && 511 (type == IGMPV3_ALLOW_NEW_SOURCES || 512 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) 513 goto decrease_sf_crcount; 514 515 /* clear marks on query responses */ 516 if (isquery) 517 psf->sf_gsresp = 0; 518 519 if (AVAILABLE(skb) < sizeof(__be32) + 520 first*sizeof(struct igmpv3_grec)) { 521 if (truncate && !first) 522 break; /* truncate these */ 523 if (pgr) 524 pgr->grec_nsrcs = htons(scount); 525 if (skb) 526 igmpv3_sendpack(skb); 527 skb = igmpv3_newpack(dev, mtu); 528 first = 1; 529 scount = 0; 530 } 531 if (first) { 532 skb = add_grhead(skb, pmc, type, &pgr, mtu); 533 first = 0; 534 } 535 if (!skb) 536 return NULL; 537 psrc = skb_put(skb, sizeof(__be32)); 538 *psrc = psf->sf_inaddr; 539 scount++; stotal++; 540 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 541 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 542 decrease_sf_crcount: 543 psf->sf_crcount--; 544 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 545 if (psf_prev) 546 psf_prev->sf_next = psf->sf_next; 547 else 548 *psf_list = psf->sf_next; 549 kfree(psf); 550 continue; 551 } 552 } 553 psf_prev = psf; 554 } 555 556 empty_source: 557 if (!stotal) { 558 if (type == IGMPV3_ALLOW_NEW_SOURCES || 559 type == IGMPV3_BLOCK_OLD_SOURCES) 560 return skb; 561 if (pmc->crcount || isquery) { 562 /* make sure we have room for group header */ 563 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { 564 igmpv3_sendpack(skb); 565 skb = NULL; /* add_grhead will get a new one */ 566 } 567 skb = add_grhead(skb, pmc, type, &pgr, mtu); 568 } 569 } 570 if (pgr) 571 pgr->grec_nsrcs = htons(scount); 572 573 if (isquery) 574 pmc->gsquery = 0; /* clear query state on report */ 575 return skb; 576 } 577 578 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 579 { 580 struct sk_buff *skb = NULL; 581 struct net *net = dev_net(in_dev->dev); 582 int type; 583 584 if (!pmc) { 585 rcu_read_lock(); 586 for_each_pmc_rcu(in_dev, pmc) { 587 if (pmc->multiaddr == IGMP_ALL_HOSTS) 588 continue; 589 if (ipv4_is_local_multicast(pmc->multiaddr) && 590 !net->ipv4.sysctl_igmp_llm_reports) 591 continue; 592 spin_lock_bh(&pmc->lock); 593 if (pmc->sfcount[MCAST_EXCLUDE]) 594 type = IGMPV3_MODE_IS_EXCLUDE; 595 else 596 type = IGMPV3_MODE_IS_INCLUDE; 597 skb = add_grec(skb, pmc, type, 0, 0); 598 spin_unlock_bh(&pmc->lock); 599 } 600 rcu_read_unlock(); 601 } else { 602 spin_lock_bh(&pmc->lock); 603 if (pmc->sfcount[MCAST_EXCLUDE]) 604 type = IGMPV3_MODE_IS_EXCLUDE; 605 else 606 type = IGMPV3_MODE_IS_INCLUDE; 607 skb = add_grec(skb, pmc, type, 0, 0); 608 spin_unlock_bh(&pmc->lock); 609 } 610 if (!skb) 611 return 0; 612 return igmpv3_sendpack(skb); 613 } 614 615 /* 616 * remove zero-count source records from a source filter list 617 */ 618 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 619 { 620 struct ip_sf_list *psf_prev, *psf_next, *psf; 621 622 psf_prev = NULL; 623 for (psf = *ppsf; psf; psf = psf_next) { 624 psf_next = psf->sf_next; 625 if (psf->sf_crcount == 0) { 626 if (psf_prev) 627 psf_prev->sf_next = psf->sf_next; 628 else 629 *ppsf = psf->sf_next; 630 kfree(psf); 631 } else 632 psf_prev = psf; 633 } 634 } 635 636 static void igmpv3_send_cr(struct in_device *in_dev) 637 { 638 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 639 struct sk_buff *skb = NULL; 640 int type, dtype; 641 642 rcu_read_lock(); 643 spin_lock_bh(&in_dev->mc_tomb_lock); 644 645 /* deleted MCA's */ 646 pmc_prev = NULL; 647 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { 648 pmc_next = pmc->next; 649 if (pmc->sfmode == MCAST_INCLUDE) { 650 type = IGMPV3_BLOCK_OLD_SOURCES; 651 dtype = IGMPV3_BLOCK_OLD_SOURCES; 652 skb = add_grec(skb, pmc, type, 1, 0); 653 skb = add_grec(skb, pmc, dtype, 1, 1); 654 } 655 if (pmc->crcount) { 656 if (pmc->sfmode == MCAST_EXCLUDE) { 657 type = IGMPV3_CHANGE_TO_INCLUDE; 658 skb = add_grec(skb, pmc, type, 1, 0); 659 } 660 pmc->crcount--; 661 if (pmc->crcount == 0) { 662 igmpv3_clear_zeros(&pmc->tomb); 663 igmpv3_clear_zeros(&pmc->sources); 664 } 665 } 666 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 667 if (pmc_prev) 668 pmc_prev->next = pmc_next; 669 else 670 in_dev->mc_tomb = pmc_next; 671 in_dev_put(pmc->interface); 672 kfree(pmc); 673 } else 674 pmc_prev = pmc; 675 } 676 spin_unlock_bh(&in_dev->mc_tomb_lock); 677 678 /* change recs */ 679 for_each_pmc_rcu(in_dev, pmc) { 680 spin_lock_bh(&pmc->lock); 681 if (pmc->sfcount[MCAST_EXCLUDE]) { 682 type = IGMPV3_BLOCK_OLD_SOURCES; 683 dtype = IGMPV3_ALLOW_NEW_SOURCES; 684 } else { 685 type = IGMPV3_ALLOW_NEW_SOURCES; 686 dtype = IGMPV3_BLOCK_OLD_SOURCES; 687 } 688 skb = add_grec(skb, pmc, type, 0, 0); 689 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 690 691 /* filter mode changes */ 692 if (pmc->crcount) { 693 if (pmc->sfmode == MCAST_EXCLUDE) 694 type = IGMPV3_CHANGE_TO_EXCLUDE; 695 else 696 type = IGMPV3_CHANGE_TO_INCLUDE; 697 skb = add_grec(skb, pmc, type, 0, 0); 698 pmc->crcount--; 699 } 700 spin_unlock_bh(&pmc->lock); 701 } 702 rcu_read_unlock(); 703 704 if (!skb) 705 return; 706 (void) igmpv3_sendpack(skb); 707 } 708 709 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 710 int type) 711 { 712 struct sk_buff *skb; 713 struct iphdr *iph; 714 struct igmphdr *ih; 715 struct rtable *rt; 716 struct net_device *dev = in_dev->dev; 717 struct net *net = dev_net(dev); 718 __be32 group = pmc ? pmc->multiaddr : 0; 719 struct flowi4 fl4; 720 __be32 dst; 721 int hlen, tlen; 722 723 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 724 return igmpv3_send_report(in_dev, pmc); 725 726 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 727 return 0; 728 729 if (type == IGMP_HOST_LEAVE_MESSAGE) 730 dst = IGMP_ALL_ROUTER; 731 else 732 dst = group; 733 734 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 735 0, 0, 736 IPPROTO_IGMP, 0, dev->ifindex); 737 if (IS_ERR(rt)) 738 return -1; 739 740 hlen = LL_RESERVED_SPACE(dev); 741 tlen = dev->needed_tailroom; 742 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 743 if (!skb) { 744 ip_rt_put(rt); 745 return -1; 746 } 747 skb->priority = TC_PRIO_CONTROL; 748 749 skb_dst_set(skb, &rt->dst); 750 751 skb_reserve(skb, hlen); 752 753 skb_reset_network_header(skb); 754 iph = ip_hdr(skb); 755 skb_put(skb, sizeof(struct iphdr) + 4); 756 757 iph->version = 4; 758 iph->ihl = (sizeof(struct iphdr)+4)>>2; 759 iph->tos = 0xc0; 760 iph->frag_off = htons(IP_DF); 761 iph->ttl = 1; 762 iph->daddr = dst; 763 iph->saddr = fl4.saddr; 764 iph->protocol = IPPROTO_IGMP; 765 ip_select_ident(net, skb, NULL); 766 ((u8 *)&iph[1])[0] = IPOPT_RA; 767 ((u8 *)&iph[1])[1] = 4; 768 ((u8 *)&iph[1])[2] = 0; 769 ((u8 *)&iph[1])[3] = 0; 770 771 ih = skb_put(skb, sizeof(struct igmphdr)); 772 ih->type = type; 773 ih->code = 0; 774 ih->csum = 0; 775 ih->group = group; 776 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 777 778 return ip_local_out(net, skb->sk, skb); 779 } 780 781 static void igmp_gq_timer_expire(struct timer_list *t) 782 { 783 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); 784 785 in_dev->mr_gq_running = 0; 786 igmpv3_send_report(in_dev, NULL); 787 in_dev_put(in_dev); 788 } 789 790 static void igmp_ifc_timer_expire(struct timer_list *t) 791 { 792 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); 793 794 igmpv3_send_cr(in_dev); 795 if (in_dev->mr_ifc_count) { 796 in_dev->mr_ifc_count--; 797 igmp_ifc_start_timer(in_dev, 798 unsolicited_report_interval(in_dev)); 799 } 800 in_dev_put(in_dev); 801 } 802 803 static void igmp_ifc_event(struct in_device *in_dev) 804 { 805 struct net *net = dev_net(in_dev->dev); 806 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 807 return; 808 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 809 igmp_ifc_start_timer(in_dev, 1); 810 } 811 812 813 static void igmp_timer_expire(struct timer_list *t) 814 { 815 struct ip_mc_list *im = from_timer(im, t, timer); 816 struct in_device *in_dev = im->interface; 817 818 spin_lock(&im->lock); 819 im->tm_running = 0; 820 821 if (im->unsolicit_count && --im->unsolicit_count) 822 igmp_start_timer(im, unsolicited_report_interval(in_dev)); 823 824 im->reporter = 1; 825 spin_unlock(&im->lock); 826 827 if (IGMP_V1_SEEN(in_dev)) 828 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 829 else if (IGMP_V2_SEEN(in_dev)) 830 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 831 else 832 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 833 834 ip_ma_put(im); 835 } 836 837 /* mark EXCLUDE-mode sources */ 838 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 839 { 840 struct ip_sf_list *psf; 841 int i, scount; 842 843 scount = 0; 844 for (psf = pmc->sources; psf; psf = psf->sf_next) { 845 if (scount == nsrcs) 846 break; 847 for (i = 0; i < nsrcs; i++) { 848 /* skip inactive filters */ 849 if (psf->sf_count[MCAST_INCLUDE] || 850 pmc->sfcount[MCAST_EXCLUDE] != 851 psf->sf_count[MCAST_EXCLUDE]) 852 break; 853 if (srcs[i] == psf->sf_inaddr) { 854 scount++; 855 break; 856 } 857 } 858 } 859 pmc->gsquery = 0; 860 if (scount == nsrcs) /* all sources excluded */ 861 return 0; 862 return 1; 863 } 864 865 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 866 { 867 struct ip_sf_list *psf; 868 int i, scount; 869 870 if (pmc->sfmode == MCAST_EXCLUDE) 871 return igmp_xmarksources(pmc, nsrcs, srcs); 872 873 /* mark INCLUDE-mode sources */ 874 scount = 0; 875 for (psf = pmc->sources; psf; psf = psf->sf_next) { 876 if (scount == nsrcs) 877 break; 878 for (i = 0; i < nsrcs; i++) 879 if (srcs[i] == psf->sf_inaddr) { 880 psf->sf_gsresp = 1; 881 scount++; 882 break; 883 } 884 } 885 if (!scount) { 886 pmc->gsquery = 0; 887 return 0; 888 } 889 pmc->gsquery = 1; 890 return 1; 891 } 892 893 /* return true if packet was dropped */ 894 static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 895 { 896 struct ip_mc_list *im; 897 struct net *net = dev_net(in_dev->dev); 898 899 /* Timers are only set for non-local groups */ 900 901 if (group == IGMP_ALL_HOSTS) 902 return false; 903 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 904 return false; 905 906 rcu_read_lock(); 907 for_each_pmc_rcu(in_dev, im) { 908 if (im->multiaddr == group) { 909 igmp_stop_timer(im); 910 break; 911 } 912 } 913 rcu_read_unlock(); 914 return false; 915 } 916 917 /* return true if packet was dropped */ 918 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 919 int len) 920 { 921 struct igmphdr *ih = igmp_hdr(skb); 922 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 923 struct ip_mc_list *im; 924 __be32 group = ih->group; 925 int max_delay; 926 int mark = 0; 927 struct net *net = dev_net(in_dev->dev); 928 929 930 if (len == 8) { 931 if (ih->code == 0) { 932 /* Alas, old v1 router presents here. */ 933 934 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 935 in_dev->mr_v1_seen = jiffies + 936 (in_dev->mr_qrv * in_dev->mr_qi) + 937 in_dev->mr_qri; 938 group = 0; 939 } else { 940 /* v2 router present */ 941 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 942 in_dev->mr_v2_seen = jiffies + 943 (in_dev->mr_qrv * in_dev->mr_qi) + 944 in_dev->mr_qri; 945 } 946 /* cancel the interface change timer */ 947 in_dev->mr_ifc_count = 0; 948 if (del_timer(&in_dev->mr_ifc_timer)) 949 __in_dev_put(in_dev); 950 /* clear deleted report items */ 951 igmpv3_clear_delrec(in_dev); 952 } else if (len < 12) { 953 return true; /* ignore bogus packet; freed by caller */ 954 } else if (IGMP_V1_SEEN(in_dev)) { 955 /* This is a v3 query with v1 queriers present */ 956 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 957 group = 0; 958 } else if (IGMP_V2_SEEN(in_dev)) { 959 /* this is a v3 query with v2 queriers present; 960 * Interpretation of the max_delay code is problematic here. 961 * A real v2 host would use ih_code directly, while v3 has a 962 * different encoding. We use the v3 encoding as more likely 963 * to be intended in a v3 query. 964 */ 965 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 966 if (!max_delay) 967 max_delay = 1; /* can't mod w/ 0 */ 968 } else { /* v3 */ 969 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 970 return true; 971 972 ih3 = igmpv3_query_hdr(skb); 973 if (ih3->nsrcs) { 974 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 975 + ntohs(ih3->nsrcs)*sizeof(__be32))) 976 return true; 977 ih3 = igmpv3_query_hdr(skb); 978 } 979 980 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 981 if (!max_delay) 982 max_delay = 1; /* can't mod w/ 0 */ 983 in_dev->mr_maxdelay = max_delay; 984 985 /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently 986 * received value was zero, use the default or statically 987 * configured value. 988 */ 989 in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv; 990 in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; 991 992 /* RFC3376, 8.3. Query Response Interval: 993 * The number of seconds represented by the [Query Response 994 * Interval] must be less than the [Query Interval]. 995 */ 996 if (in_dev->mr_qri >= in_dev->mr_qi) 997 in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; 998 999 if (!group) { /* general query */ 1000 if (ih3->nsrcs) 1001 return true; /* no sources allowed */ 1002 igmp_gq_start_timer(in_dev); 1003 return false; 1004 } 1005 /* mark sources to include, if group & source-specific */ 1006 mark = ih3->nsrcs != 0; 1007 } 1008 1009 /* 1010 * - Start the timers in all of our membership records 1011 * that the query applies to for the interface on 1012 * which the query arrived excl. those that belong 1013 * to a "local" group (224.0.0.X) 1014 * - For timers already running check if they need to 1015 * be reset. 1016 * - Use the igmp->igmp_code field as the maximum 1017 * delay possible 1018 */ 1019 rcu_read_lock(); 1020 for_each_pmc_rcu(in_dev, im) { 1021 int changed; 1022 1023 if (group && group != im->multiaddr) 1024 continue; 1025 if (im->multiaddr == IGMP_ALL_HOSTS) 1026 continue; 1027 if (ipv4_is_local_multicast(im->multiaddr) && 1028 !net->ipv4.sysctl_igmp_llm_reports) 1029 continue; 1030 spin_lock_bh(&im->lock); 1031 if (im->tm_running) 1032 im->gsquery = im->gsquery && mark; 1033 else 1034 im->gsquery = mark; 1035 changed = !im->gsquery || 1036 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 1037 spin_unlock_bh(&im->lock); 1038 if (changed) 1039 igmp_mod_timer(im, max_delay); 1040 } 1041 rcu_read_unlock(); 1042 return false; 1043 } 1044 1045 /* called in rcu_read_lock() section */ 1046 int igmp_rcv(struct sk_buff *skb) 1047 { 1048 /* This basically follows the spec line by line -- see RFC1112 */ 1049 struct igmphdr *ih; 1050 struct net_device *dev = skb->dev; 1051 struct in_device *in_dev; 1052 int len = skb->len; 1053 bool dropped = true; 1054 1055 if (netif_is_l3_master(dev)) { 1056 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); 1057 if (!dev) 1058 goto drop; 1059 } 1060 1061 in_dev = __in_dev_get_rcu(dev); 1062 if (!in_dev) 1063 goto drop; 1064 1065 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 1066 goto drop; 1067 1068 if (skb_checksum_simple_validate(skb)) 1069 goto drop; 1070 1071 ih = igmp_hdr(skb); 1072 switch (ih->type) { 1073 case IGMP_HOST_MEMBERSHIP_QUERY: 1074 dropped = igmp_heard_query(in_dev, skb, len); 1075 break; 1076 case IGMP_HOST_MEMBERSHIP_REPORT: 1077 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1078 /* Is it our report looped back? */ 1079 if (rt_is_output_route(skb_rtable(skb))) 1080 break; 1081 /* don't rely on MC router hearing unicast reports */ 1082 if (skb->pkt_type == PACKET_MULTICAST || 1083 skb->pkt_type == PACKET_BROADCAST) 1084 dropped = igmp_heard_report(in_dev, ih->group); 1085 break; 1086 case IGMP_PIM: 1087 #ifdef CONFIG_IP_PIMSM_V1 1088 return pim_rcv_v1(skb); 1089 #endif 1090 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1091 case IGMP_DVMRP: 1092 case IGMP_TRACE: 1093 case IGMP_HOST_LEAVE_MESSAGE: 1094 case IGMP_MTRACE: 1095 case IGMP_MTRACE_RESP: 1096 break; 1097 default: 1098 break; 1099 } 1100 1101 drop: 1102 if (dropped) 1103 kfree_skb(skb); 1104 else 1105 consume_skb(skb); 1106 return 0; 1107 } 1108 1109 #endif 1110 1111 1112 /* 1113 * Add a filter to a device 1114 */ 1115 1116 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1117 { 1118 char buf[MAX_ADDR_LEN]; 1119 struct net_device *dev = in_dev->dev; 1120 1121 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1122 We will get multicast token leakage, when IFF_MULTICAST 1123 is changed. This check should be done in ndo_set_rx_mode 1124 routine. Something sort of: 1125 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1126 --ANK 1127 */ 1128 if (arp_mc_map(addr, buf, dev, 0) == 0) 1129 dev_mc_add(dev, buf); 1130 } 1131 1132 /* 1133 * Remove a filter from a device 1134 */ 1135 1136 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1137 { 1138 char buf[MAX_ADDR_LEN]; 1139 struct net_device *dev = in_dev->dev; 1140 1141 if (arp_mc_map(addr, buf, dev, 0) == 0) 1142 dev_mc_del(dev, buf); 1143 } 1144 1145 #ifdef CONFIG_IP_MULTICAST 1146 /* 1147 * deleted ip_mc_list manipulation 1148 */ 1149 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, 1150 gfp_t gfp) 1151 { 1152 struct ip_mc_list *pmc; 1153 struct net *net = dev_net(in_dev->dev); 1154 1155 /* this is an "ip_mc_list" for convenience; only the fields below 1156 * are actually used. In particular, the refcnt and users are not 1157 * used for management of the delete list. Using the same structure 1158 * for deleted items allows change reports to use common code with 1159 * non-deleted or query-response MCA's. 1160 */ 1161 pmc = kzalloc(sizeof(*pmc), gfp); 1162 if (!pmc) 1163 return; 1164 spin_lock_init(&pmc->lock); 1165 spin_lock_bh(&im->lock); 1166 pmc->interface = im->interface; 1167 in_dev_hold(in_dev); 1168 pmc->multiaddr = im->multiaddr; 1169 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1170 pmc->sfmode = im->sfmode; 1171 if (pmc->sfmode == MCAST_INCLUDE) { 1172 struct ip_sf_list *psf; 1173 1174 pmc->tomb = im->tomb; 1175 pmc->sources = im->sources; 1176 im->tomb = im->sources = NULL; 1177 for (psf = pmc->sources; psf; psf = psf->sf_next) 1178 psf->sf_crcount = pmc->crcount; 1179 } 1180 spin_unlock_bh(&im->lock); 1181 1182 spin_lock_bh(&in_dev->mc_tomb_lock); 1183 pmc->next = in_dev->mc_tomb; 1184 in_dev->mc_tomb = pmc; 1185 spin_unlock_bh(&in_dev->mc_tomb_lock); 1186 } 1187 1188 /* 1189 * restore ip_mc_list deleted records 1190 */ 1191 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1192 { 1193 struct ip_mc_list *pmc, *pmc_prev; 1194 struct ip_sf_list *psf; 1195 struct net *net = dev_net(in_dev->dev); 1196 __be32 multiaddr = im->multiaddr; 1197 1198 spin_lock_bh(&in_dev->mc_tomb_lock); 1199 pmc_prev = NULL; 1200 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1201 if (pmc->multiaddr == multiaddr) 1202 break; 1203 pmc_prev = pmc; 1204 } 1205 if (pmc) { 1206 if (pmc_prev) 1207 pmc_prev->next = pmc->next; 1208 else 1209 in_dev->mc_tomb = pmc->next; 1210 } 1211 spin_unlock_bh(&in_dev->mc_tomb_lock); 1212 1213 spin_lock_bh(&im->lock); 1214 if (pmc) { 1215 im->interface = pmc->interface; 1216 if (im->sfmode == MCAST_INCLUDE) { 1217 im->tomb = pmc->tomb; 1218 im->sources = pmc->sources; 1219 for (psf = im->sources; psf; psf = psf->sf_next) 1220 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1221 } else { 1222 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1223 } 1224 in_dev_put(pmc->interface); 1225 kfree(pmc); 1226 } 1227 spin_unlock_bh(&im->lock); 1228 } 1229 1230 /* 1231 * flush ip_mc_list deleted records 1232 */ 1233 static void igmpv3_clear_delrec(struct in_device *in_dev) 1234 { 1235 struct ip_mc_list *pmc, *nextpmc; 1236 1237 spin_lock_bh(&in_dev->mc_tomb_lock); 1238 pmc = in_dev->mc_tomb; 1239 in_dev->mc_tomb = NULL; 1240 spin_unlock_bh(&in_dev->mc_tomb_lock); 1241 1242 for (; pmc; pmc = nextpmc) { 1243 nextpmc = pmc->next; 1244 ip_mc_clear_src(pmc); 1245 in_dev_put(pmc->interface); 1246 kfree(pmc); 1247 } 1248 /* clear dead sources, too */ 1249 rcu_read_lock(); 1250 for_each_pmc_rcu(in_dev, pmc) { 1251 struct ip_sf_list *psf, *psf_next; 1252 1253 spin_lock_bh(&pmc->lock); 1254 psf = pmc->tomb; 1255 pmc->tomb = NULL; 1256 spin_unlock_bh(&pmc->lock); 1257 for (; psf; psf = psf_next) { 1258 psf_next = psf->sf_next; 1259 kfree(psf); 1260 } 1261 } 1262 rcu_read_unlock(); 1263 } 1264 #endif 1265 1266 static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp) 1267 { 1268 struct in_device *in_dev = im->interface; 1269 #ifdef CONFIG_IP_MULTICAST 1270 struct net *net = dev_net(in_dev->dev); 1271 int reporter; 1272 #endif 1273 1274 if (im->loaded) { 1275 im->loaded = 0; 1276 ip_mc_filter_del(in_dev, im->multiaddr); 1277 } 1278 1279 #ifdef CONFIG_IP_MULTICAST 1280 if (im->multiaddr == IGMP_ALL_HOSTS) 1281 return; 1282 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1283 return; 1284 1285 reporter = im->reporter; 1286 igmp_stop_timer(im); 1287 1288 if (!in_dev->dead) { 1289 if (IGMP_V1_SEEN(in_dev)) 1290 return; 1291 if (IGMP_V2_SEEN(in_dev)) { 1292 if (reporter) 1293 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1294 return; 1295 } 1296 /* IGMPv3 */ 1297 igmpv3_add_delrec(in_dev, im, gfp); 1298 1299 igmp_ifc_event(in_dev); 1300 } 1301 #endif 1302 } 1303 1304 static void igmp_group_dropped(struct ip_mc_list *im) 1305 { 1306 __igmp_group_dropped(im, GFP_KERNEL); 1307 } 1308 1309 static void igmp_group_added(struct ip_mc_list *im) 1310 { 1311 struct in_device *in_dev = im->interface; 1312 #ifdef CONFIG_IP_MULTICAST 1313 struct net *net = dev_net(in_dev->dev); 1314 #endif 1315 1316 if (im->loaded == 0) { 1317 im->loaded = 1; 1318 ip_mc_filter_add(in_dev, im->multiaddr); 1319 } 1320 1321 #ifdef CONFIG_IP_MULTICAST 1322 if (im->multiaddr == IGMP_ALL_HOSTS) 1323 return; 1324 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1325 return; 1326 1327 if (in_dev->dead) 1328 return; 1329 1330 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; 1331 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1332 spin_lock_bh(&im->lock); 1333 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1334 spin_unlock_bh(&im->lock); 1335 return; 1336 } 1337 /* else, v3 */ 1338 1339 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should 1340 * not send filter-mode change record as the mode should be from 1341 * IN() to IN(A). 1342 */ 1343 if (im->sfmode == MCAST_EXCLUDE) 1344 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1345 1346 igmp_ifc_event(in_dev); 1347 #endif 1348 } 1349 1350 1351 /* 1352 * Multicast list managers 1353 */ 1354 1355 static u32 ip_mc_hash(const struct ip_mc_list *im) 1356 { 1357 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1358 } 1359 1360 static void ip_mc_hash_add(struct in_device *in_dev, 1361 struct ip_mc_list *im) 1362 { 1363 struct ip_mc_list __rcu **mc_hash; 1364 u32 hash; 1365 1366 mc_hash = rtnl_dereference(in_dev->mc_hash); 1367 if (mc_hash) { 1368 hash = ip_mc_hash(im); 1369 im->next_hash = mc_hash[hash]; 1370 rcu_assign_pointer(mc_hash[hash], im); 1371 return; 1372 } 1373 1374 /* do not use a hash table for small number of items */ 1375 if (in_dev->mc_count < 4) 1376 return; 1377 1378 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1379 GFP_KERNEL); 1380 if (!mc_hash) 1381 return; 1382 1383 for_each_pmc_rtnl(in_dev, im) { 1384 hash = ip_mc_hash(im); 1385 im->next_hash = mc_hash[hash]; 1386 RCU_INIT_POINTER(mc_hash[hash], im); 1387 } 1388 1389 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1390 } 1391 1392 static void ip_mc_hash_remove(struct in_device *in_dev, 1393 struct ip_mc_list *im) 1394 { 1395 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1396 struct ip_mc_list *aux; 1397 1398 if (!mc_hash) 1399 return; 1400 mc_hash += ip_mc_hash(im); 1401 while ((aux = rtnl_dereference(*mc_hash)) != im) 1402 mc_hash = &aux->next_hash; 1403 *mc_hash = im->next_hash; 1404 } 1405 1406 1407 /* 1408 * A socket has joined a multicast group on device dev. 1409 */ 1410 static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr, 1411 unsigned int mode, gfp_t gfp) 1412 { 1413 struct ip_mc_list *im; 1414 1415 ASSERT_RTNL(); 1416 1417 for_each_pmc_rtnl(in_dev, im) { 1418 if (im->multiaddr == addr) { 1419 im->users++; 1420 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); 1421 goto out; 1422 } 1423 } 1424 1425 im = kzalloc(sizeof(*im), gfp); 1426 if (!im) 1427 goto out; 1428 1429 im->users = 1; 1430 im->interface = in_dev; 1431 in_dev_hold(in_dev); 1432 im->multiaddr = addr; 1433 /* initial mode is (EX, empty) */ 1434 im->sfmode = mode; 1435 im->sfcount[mode] = 1; 1436 refcount_set(&im->refcnt, 1); 1437 spin_lock_init(&im->lock); 1438 #ifdef CONFIG_IP_MULTICAST 1439 timer_setup(&im->timer, igmp_timer_expire, 0); 1440 #endif 1441 1442 im->next_rcu = in_dev->mc_list; 1443 in_dev->mc_count++; 1444 rcu_assign_pointer(in_dev->mc_list, im); 1445 1446 ip_mc_hash_add(in_dev, im); 1447 1448 #ifdef CONFIG_IP_MULTICAST 1449 igmpv3_del_delrec(in_dev, im); 1450 #endif 1451 igmp_group_added(im); 1452 if (!in_dev->dead) 1453 ip_rt_multicast_event(in_dev); 1454 out: 1455 return; 1456 } 1457 1458 void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) 1459 { 1460 ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp); 1461 } 1462 EXPORT_SYMBOL(__ip_mc_inc_group); 1463 1464 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1465 { 1466 __ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE); 1467 } 1468 EXPORT_SYMBOL(ip_mc_inc_group); 1469 1470 static int ip_mc_check_iphdr(struct sk_buff *skb) 1471 { 1472 const struct iphdr *iph; 1473 unsigned int len; 1474 unsigned int offset = skb_network_offset(skb) + sizeof(*iph); 1475 1476 if (!pskb_may_pull(skb, offset)) 1477 return -EINVAL; 1478 1479 iph = ip_hdr(skb); 1480 1481 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) 1482 return -EINVAL; 1483 1484 offset += ip_hdrlen(skb) - sizeof(*iph); 1485 1486 if (!pskb_may_pull(skb, offset)) 1487 return -EINVAL; 1488 1489 iph = ip_hdr(skb); 1490 1491 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1492 return -EINVAL; 1493 1494 len = skb_network_offset(skb) + ntohs(iph->tot_len); 1495 if (skb->len < len || len < offset) 1496 return -EINVAL; 1497 1498 skb_set_transport_header(skb, offset); 1499 1500 return 0; 1501 } 1502 1503 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) 1504 { 1505 unsigned int len = skb_transport_offset(skb); 1506 1507 len += sizeof(struct igmpv3_report); 1508 1509 return ip_mc_may_pull(skb, len) ? 0 : -EINVAL; 1510 } 1511 1512 static int ip_mc_check_igmp_query(struct sk_buff *skb) 1513 { 1514 unsigned int transport_len = ip_transport_len(skb); 1515 unsigned int len; 1516 1517 /* IGMPv{1,2}? */ 1518 if (transport_len != sizeof(struct igmphdr)) { 1519 /* or IGMPv3? */ 1520 if (transport_len < sizeof(struct igmpv3_query)) 1521 return -EINVAL; 1522 1523 len = skb_transport_offset(skb) + sizeof(struct igmpv3_query); 1524 if (!ip_mc_may_pull(skb, len)) 1525 return -EINVAL; 1526 } 1527 1528 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1529 * all-systems destination addresses (224.0.0.1) for general queries 1530 */ 1531 if (!igmp_hdr(skb)->group && 1532 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) 1533 return -EINVAL; 1534 1535 return 0; 1536 } 1537 1538 static int ip_mc_check_igmp_msg(struct sk_buff *skb) 1539 { 1540 switch (igmp_hdr(skb)->type) { 1541 case IGMP_HOST_LEAVE_MESSAGE: 1542 case IGMP_HOST_MEMBERSHIP_REPORT: 1543 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1544 return 0; 1545 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1546 return ip_mc_check_igmp_reportv3(skb); 1547 case IGMP_HOST_MEMBERSHIP_QUERY: 1548 return ip_mc_check_igmp_query(skb); 1549 default: 1550 return -ENOMSG; 1551 } 1552 } 1553 1554 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) 1555 { 1556 return skb_checksum_simple_validate(skb); 1557 } 1558 1559 static int ip_mc_check_igmp_csum(struct sk_buff *skb) 1560 { 1561 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); 1562 unsigned int transport_len = ip_transport_len(skb); 1563 struct sk_buff *skb_chk; 1564 1565 if (!ip_mc_may_pull(skb, len)) 1566 return -EINVAL; 1567 1568 skb_chk = skb_checksum_trimmed(skb, transport_len, 1569 ip_mc_validate_checksum); 1570 if (!skb_chk) 1571 return -EINVAL; 1572 1573 if (skb_chk != skb) 1574 kfree_skb(skb_chk); 1575 1576 return 0; 1577 } 1578 1579 /** 1580 * ip_mc_check_igmp - checks whether this is a sane IGMP packet 1581 * @skb: the skb to validate 1582 * 1583 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets 1584 * skb transport header accordingly and returns zero. 1585 * 1586 * -EINVAL: A broken packet was detected, i.e. it violates some internet 1587 * standard 1588 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. 1589 * -ENOMEM: A memory allocation failure happened. 1590 * 1591 * Caller needs to set the skb network header and free any returned skb if it 1592 * differs from the provided skb. 1593 */ 1594 int ip_mc_check_igmp(struct sk_buff *skb) 1595 { 1596 int ret = ip_mc_check_iphdr(skb); 1597 1598 if (ret < 0) 1599 return ret; 1600 1601 if (ip_hdr(skb)->protocol != IPPROTO_IGMP) 1602 return -ENOMSG; 1603 1604 ret = ip_mc_check_igmp_csum(skb); 1605 if (ret < 0) 1606 return ret; 1607 1608 return ip_mc_check_igmp_msg(skb); 1609 } 1610 EXPORT_SYMBOL(ip_mc_check_igmp); 1611 1612 /* 1613 * Resend IGMP JOIN report; used by netdev notifier. 1614 */ 1615 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1616 { 1617 #ifdef CONFIG_IP_MULTICAST 1618 struct ip_mc_list *im; 1619 int type; 1620 struct net *net = dev_net(in_dev->dev); 1621 1622 ASSERT_RTNL(); 1623 1624 for_each_pmc_rtnl(in_dev, im) { 1625 if (im->multiaddr == IGMP_ALL_HOSTS) 1626 continue; 1627 if (ipv4_is_local_multicast(im->multiaddr) && 1628 !net->ipv4.sysctl_igmp_llm_reports) 1629 continue; 1630 1631 /* a failover is happening and switches 1632 * must be notified immediately 1633 */ 1634 if (IGMP_V1_SEEN(in_dev)) 1635 type = IGMP_HOST_MEMBERSHIP_REPORT; 1636 else if (IGMP_V2_SEEN(in_dev)) 1637 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1638 else 1639 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1640 igmp_send_report(in_dev, im, type); 1641 } 1642 #endif 1643 } 1644 1645 /* 1646 * A socket has left a multicast group on device dev 1647 */ 1648 1649 void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) 1650 { 1651 struct ip_mc_list *i; 1652 struct ip_mc_list __rcu **ip; 1653 1654 ASSERT_RTNL(); 1655 1656 for (ip = &in_dev->mc_list; 1657 (i = rtnl_dereference(*ip)) != NULL; 1658 ip = &i->next_rcu) { 1659 if (i->multiaddr == addr) { 1660 if (--i->users == 0) { 1661 ip_mc_hash_remove(in_dev, i); 1662 *ip = i->next_rcu; 1663 in_dev->mc_count--; 1664 __igmp_group_dropped(i, gfp); 1665 ip_mc_clear_src(i); 1666 1667 if (!in_dev->dead) 1668 ip_rt_multicast_event(in_dev); 1669 1670 ip_ma_put(i); 1671 return; 1672 } 1673 break; 1674 } 1675 } 1676 } 1677 EXPORT_SYMBOL(__ip_mc_dec_group); 1678 1679 /* Device changing type */ 1680 1681 void ip_mc_unmap(struct in_device *in_dev) 1682 { 1683 struct ip_mc_list *pmc; 1684 1685 ASSERT_RTNL(); 1686 1687 for_each_pmc_rtnl(in_dev, pmc) 1688 igmp_group_dropped(pmc); 1689 } 1690 1691 void ip_mc_remap(struct in_device *in_dev) 1692 { 1693 struct ip_mc_list *pmc; 1694 1695 ASSERT_RTNL(); 1696 1697 for_each_pmc_rtnl(in_dev, pmc) { 1698 #ifdef CONFIG_IP_MULTICAST 1699 igmpv3_del_delrec(in_dev, pmc); 1700 #endif 1701 igmp_group_added(pmc); 1702 } 1703 } 1704 1705 /* Device going down */ 1706 1707 void ip_mc_down(struct in_device *in_dev) 1708 { 1709 struct ip_mc_list *pmc; 1710 1711 ASSERT_RTNL(); 1712 1713 for_each_pmc_rtnl(in_dev, pmc) 1714 igmp_group_dropped(pmc); 1715 1716 #ifdef CONFIG_IP_MULTICAST 1717 in_dev->mr_ifc_count = 0; 1718 if (del_timer(&in_dev->mr_ifc_timer)) 1719 __in_dev_put(in_dev); 1720 in_dev->mr_gq_running = 0; 1721 if (del_timer(&in_dev->mr_gq_timer)) 1722 __in_dev_put(in_dev); 1723 #endif 1724 1725 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1726 } 1727 1728 #ifdef CONFIG_IP_MULTICAST 1729 static void ip_mc_reset(struct in_device *in_dev) 1730 { 1731 struct net *net = dev_net(in_dev->dev); 1732 1733 in_dev->mr_qi = IGMP_QUERY_INTERVAL; 1734 in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL; 1735 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1736 } 1737 #else 1738 static void ip_mc_reset(struct in_device *in_dev) 1739 { 1740 } 1741 #endif 1742 1743 void ip_mc_init_dev(struct in_device *in_dev) 1744 { 1745 ASSERT_RTNL(); 1746 1747 #ifdef CONFIG_IP_MULTICAST 1748 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); 1749 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); 1750 #endif 1751 ip_mc_reset(in_dev); 1752 1753 spin_lock_init(&in_dev->mc_tomb_lock); 1754 } 1755 1756 /* Device going up */ 1757 1758 void ip_mc_up(struct in_device *in_dev) 1759 { 1760 struct ip_mc_list *pmc; 1761 1762 ASSERT_RTNL(); 1763 1764 ip_mc_reset(in_dev); 1765 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1766 1767 for_each_pmc_rtnl(in_dev, pmc) { 1768 #ifdef CONFIG_IP_MULTICAST 1769 igmpv3_del_delrec(in_dev, pmc); 1770 #endif 1771 igmp_group_added(pmc); 1772 } 1773 } 1774 1775 /* 1776 * Device is about to be destroyed: clean up. 1777 */ 1778 1779 void ip_mc_destroy_dev(struct in_device *in_dev) 1780 { 1781 struct ip_mc_list *i; 1782 1783 ASSERT_RTNL(); 1784 1785 /* Deactivate timers */ 1786 ip_mc_down(in_dev); 1787 #ifdef CONFIG_IP_MULTICAST 1788 igmpv3_clear_delrec(in_dev); 1789 #endif 1790 1791 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1792 in_dev->mc_list = i->next_rcu; 1793 in_dev->mc_count--; 1794 ip_ma_put(i); 1795 } 1796 } 1797 1798 /* RTNL is locked */ 1799 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1800 { 1801 struct net_device *dev = NULL; 1802 struct in_device *idev = NULL; 1803 1804 if (imr->imr_ifindex) { 1805 idev = inetdev_by_index(net, imr->imr_ifindex); 1806 return idev; 1807 } 1808 if (imr->imr_address.s_addr) { 1809 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1810 if (!dev) 1811 return NULL; 1812 } 1813 1814 if (!dev) { 1815 struct rtable *rt = ip_route_output(net, 1816 imr->imr_multiaddr.s_addr, 1817 0, 0, 0); 1818 if (!IS_ERR(rt)) { 1819 dev = rt->dst.dev; 1820 ip_rt_put(rt); 1821 } 1822 } 1823 if (dev) { 1824 imr->imr_ifindex = dev->ifindex; 1825 idev = __in_dev_get_rtnl(dev); 1826 } 1827 return idev; 1828 } 1829 1830 /* 1831 * Join a socket to a group 1832 */ 1833 1834 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1835 __be32 *psfsrc) 1836 { 1837 struct ip_sf_list *psf, *psf_prev; 1838 int rv = 0; 1839 1840 psf_prev = NULL; 1841 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1842 if (psf->sf_inaddr == *psfsrc) 1843 break; 1844 psf_prev = psf; 1845 } 1846 if (!psf || psf->sf_count[sfmode] == 0) { 1847 /* source filter not found, or count wrong => bug */ 1848 return -ESRCH; 1849 } 1850 psf->sf_count[sfmode]--; 1851 if (psf->sf_count[sfmode] == 0) { 1852 ip_rt_multicast_event(pmc->interface); 1853 } 1854 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1855 #ifdef CONFIG_IP_MULTICAST 1856 struct in_device *in_dev = pmc->interface; 1857 struct net *net = dev_net(in_dev->dev); 1858 #endif 1859 1860 /* no more filters for this source */ 1861 if (psf_prev) 1862 psf_prev->sf_next = psf->sf_next; 1863 else 1864 pmc->sources = psf->sf_next; 1865 #ifdef CONFIG_IP_MULTICAST 1866 if (psf->sf_oldin && 1867 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1868 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1869 psf->sf_next = pmc->tomb; 1870 pmc->tomb = psf; 1871 rv = 1; 1872 } else 1873 #endif 1874 kfree(psf); 1875 } 1876 return rv; 1877 } 1878 1879 #ifndef CONFIG_IP_MULTICAST 1880 #define igmp_ifc_event(x) do { } while (0) 1881 #endif 1882 1883 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1884 int sfcount, __be32 *psfsrc, int delta) 1885 { 1886 struct ip_mc_list *pmc; 1887 int changerec = 0; 1888 int i, err; 1889 1890 if (!in_dev) 1891 return -ENODEV; 1892 rcu_read_lock(); 1893 for_each_pmc_rcu(in_dev, pmc) { 1894 if (*pmca == pmc->multiaddr) 1895 break; 1896 } 1897 if (!pmc) { 1898 /* MCA not found?? bug */ 1899 rcu_read_unlock(); 1900 return -ESRCH; 1901 } 1902 spin_lock_bh(&pmc->lock); 1903 rcu_read_unlock(); 1904 #ifdef CONFIG_IP_MULTICAST 1905 sf_markstate(pmc); 1906 #endif 1907 if (!delta) { 1908 err = -EINVAL; 1909 if (!pmc->sfcount[sfmode]) 1910 goto out_unlock; 1911 pmc->sfcount[sfmode]--; 1912 } 1913 err = 0; 1914 for (i = 0; i < sfcount; i++) { 1915 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1916 1917 changerec |= rv > 0; 1918 if (!err && rv < 0) 1919 err = rv; 1920 } 1921 if (pmc->sfmode == MCAST_EXCLUDE && 1922 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1923 pmc->sfcount[MCAST_INCLUDE]) { 1924 #ifdef CONFIG_IP_MULTICAST 1925 struct ip_sf_list *psf; 1926 struct net *net = dev_net(in_dev->dev); 1927 #endif 1928 1929 /* filter mode change */ 1930 pmc->sfmode = MCAST_INCLUDE; 1931 #ifdef CONFIG_IP_MULTICAST 1932 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1933 in_dev->mr_ifc_count = pmc->crcount; 1934 for (psf = pmc->sources; psf; psf = psf->sf_next) 1935 psf->sf_crcount = 0; 1936 igmp_ifc_event(pmc->interface); 1937 } else if (sf_setstate(pmc) || changerec) { 1938 igmp_ifc_event(pmc->interface); 1939 #endif 1940 } 1941 out_unlock: 1942 spin_unlock_bh(&pmc->lock); 1943 return err; 1944 } 1945 1946 /* 1947 * Add multicast single-source filter to the interface list 1948 */ 1949 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1950 __be32 *psfsrc) 1951 { 1952 struct ip_sf_list *psf, *psf_prev; 1953 1954 psf_prev = NULL; 1955 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1956 if (psf->sf_inaddr == *psfsrc) 1957 break; 1958 psf_prev = psf; 1959 } 1960 if (!psf) { 1961 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1962 if (!psf) 1963 return -ENOBUFS; 1964 psf->sf_inaddr = *psfsrc; 1965 if (psf_prev) { 1966 psf_prev->sf_next = psf; 1967 } else 1968 pmc->sources = psf; 1969 } 1970 psf->sf_count[sfmode]++; 1971 if (psf->sf_count[sfmode] == 1) { 1972 ip_rt_multicast_event(pmc->interface); 1973 } 1974 return 0; 1975 } 1976 1977 #ifdef CONFIG_IP_MULTICAST 1978 static void sf_markstate(struct ip_mc_list *pmc) 1979 { 1980 struct ip_sf_list *psf; 1981 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1982 1983 for (psf = pmc->sources; psf; psf = psf->sf_next) 1984 if (pmc->sfcount[MCAST_EXCLUDE]) { 1985 psf->sf_oldin = mca_xcount == 1986 psf->sf_count[MCAST_EXCLUDE] && 1987 !psf->sf_count[MCAST_INCLUDE]; 1988 } else 1989 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1990 } 1991 1992 static int sf_setstate(struct ip_mc_list *pmc) 1993 { 1994 struct ip_sf_list *psf, *dpsf; 1995 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1996 int qrv = pmc->interface->mr_qrv; 1997 int new_in, rv; 1998 1999 rv = 0; 2000 for (psf = pmc->sources; psf; psf = psf->sf_next) { 2001 if (pmc->sfcount[MCAST_EXCLUDE]) { 2002 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2003 !psf->sf_count[MCAST_INCLUDE]; 2004 } else 2005 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2006 if (new_in) { 2007 if (!psf->sf_oldin) { 2008 struct ip_sf_list *prev = NULL; 2009 2010 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 2011 if (dpsf->sf_inaddr == psf->sf_inaddr) 2012 break; 2013 prev = dpsf; 2014 } 2015 if (dpsf) { 2016 if (prev) 2017 prev->sf_next = dpsf->sf_next; 2018 else 2019 pmc->tomb = dpsf->sf_next; 2020 kfree(dpsf); 2021 } 2022 psf->sf_crcount = qrv; 2023 rv++; 2024 } 2025 } else if (psf->sf_oldin) { 2026 2027 psf->sf_crcount = 0; 2028 /* 2029 * add or update "delete" records if an active filter 2030 * is now inactive 2031 */ 2032 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 2033 if (dpsf->sf_inaddr == psf->sf_inaddr) 2034 break; 2035 if (!dpsf) { 2036 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2037 if (!dpsf) 2038 continue; 2039 *dpsf = *psf; 2040 /* pmc->lock held by callers */ 2041 dpsf->sf_next = pmc->tomb; 2042 pmc->tomb = dpsf; 2043 } 2044 dpsf->sf_crcount = qrv; 2045 rv++; 2046 } 2047 } 2048 return rv; 2049 } 2050 #endif 2051 2052 /* 2053 * Add multicast source filter list to the interface list 2054 */ 2055 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 2056 int sfcount, __be32 *psfsrc, int delta) 2057 { 2058 struct ip_mc_list *pmc; 2059 int isexclude; 2060 int i, err; 2061 2062 if (!in_dev) 2063 return -ENODEV; 2064 rcu_read_lock(); 2065 for_each_pmc_rcu(in_dev, pmc) { 2066 if (*pmca == pmc->multiaddr) 2067 break; 2068 } 2069 if (!pmc) { 2070 /* MCA not found?? bug */ 2071 rcu_read_unlock(); 2072 return -ESRCH; 2073 } 2074 spin_lock_bh(&pmc->lock); 2075 rcu_read_unlock(); 2076 2077 #ifdef CONFIG_IP_MULTICAST 2078 sf_markstate(pmc); 2079 #endif 2080 isexclude = pmc->sfmode == MCAST_EXCLUDE; 2081 if (!delta) 2082 pmc->sfcount[sfmode]++; 2083 err = 0; 2084 for (i = 0; i < sfcount; i++) { 2085 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2086 if (err) 2087 break; 2088 } 2089 if (err) { 2090 int j; 2091 2092 if (!delta) 2093 pmc->sfcount[sfmode]--; 2094 for (j = 0; j < i; j++) 2095 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2096 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 2097 #ifdef CONFIG_IP_MULTICAST 2098 struct ip_sf_list *psf; 2099 struct net *net = dev_net(pmc->interface->dev); 2100 in_dev = pmc->interface; 2101 #endif 2102 2103 /* filter mode change */ 2104 if (pmc->sfcount[MCAST_EXCLUDE]) 2105 pmc->sfmode = MCAST_EXCLUDE; 2106 else if (pmc->sfcount[MCAST_INCLUDE]) 2107 pmc->sfmode = MCAST_INCLUDE; 2108 #ifdef CONFIG_IP_MULTICAST 2109 /* else no filters; keep old mode for reports */ 2110 2111 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 2112 in_dev->mr_ifc_count = pmc->crcount; 2113 for (psf = pmc->sources; psf; psf = psf->sf_next) 2114 psf->sf_crcount = 0; 2115 igmp_ifc_event(in_dev); 2116 } else if (sf_setstate(pmc)) { 2117 igmp_ifc_event(in_dev); 2118 #endif 2119 } 2120 spin_unlock_bh(&pmc->lock); 2121 return err; 2122 } 2123 2124 static void ip_mc_clear_src(struct ip_mc_list *pmc) 2125 { 2126 struct ip_sf_list *psf, *nextpsf, *tomb, *sources; 2127 2128 spin_lock_bh(&pmc->lock); 2129 tomb = pmc->tomb; 2130 pmc->tomb = NULL; 2131 sources = pmc->sources; 2132 pmc->sources = NULL; 2133 pmc->sfmode = MCAST_EXCLUDE; 2134 pmc->sfcount[MCAST_INCLUDE] = 0; 2135 pmc->sfcount[MCAST_EXCLUDE] = 1; 2136 spin_unlock_bh(&pmc->lock); 2137 2138 for (psf = tomb; psf; psf = nextpsf) { 2139 nextpsf = psf->sf_next; 2140 kfree(psf); 2141 } 2142 for (psf = sources; psf; psf = nextpsf) { 2143 nextpsf = psf->sf_next; 2144 kfree(psf); 2145 } 2146 } 2147 2148 /* Join a multicast group 2149 */ 2150 static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, 2151 unsigned int mode) 2152 { 2153 __be32 addr = imr->imr_multiaddr.s_addr; 2154 struct ip_mc_socklist *iml, *i; 2155 struct in_device *in_dev; 2156 struct inet_sock *inet = inet_sk(sk); 2157 struct net *net = sock_net(sk); 2158 int ifindex; 2159 int count = 0; 2160 int err; 2161 2162 ASSERT_RTNL(); 2163 2164 if (!ipv4_is_multicast(addr)) 2165 return -EINVAL; 2166 2167 in_dev = ip_mc_find_dev(net, imr); 2168 2169 if (!in_dev) { 2170 err = -ENODEV; 2171 goto done; 2172 } 2173 2174 err = -EADDRINUSE; 2175 ifindex = imr->imr_ifindex; 2176 for_each_pmc_rtnl(inet, i) { 2177 if (i->multi.imr_multiaddr.s_addr == addr && 2178 i->multi.imr_ifindex == ifindex) 2179 goto done; 2180 count++; 2181 } 2182 err = -ENOBUFS; 2183 if (count >= net->ipv4.sysctl_igmp_max_memberships) 2184 goto done; 2185 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 2186 if (!iml) 2187 goto done; 2188 2189 memcpy(&iml->multi, imr, sizeof(*imr)); 2190 iml->next_rcu = inet->mc_list; 2191 iml->sflist = NULL; 2192 iml->sfmode = mode; 2193 rcu_assign_pointer(inet->mc_list, iml); 2194 __ip_mc_inc_group(in_dev, addr, mode); 2195 err = 0; 2196 done: 2197 return err; 2198 } 2199 2200 /* Join ASM (Any-Source Multicast) group 2201 */ 2202 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) 2203 { 2204 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); 2205 } 2206 EXPORT_SYMBOL(ip_mc_join_group); 2207 2208 /* Join SSM (Source-Specific Multicast) group 2209 */ 2210 int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, 2211 unsigned int mode) 2212 { 2213 return __ip_mc_join_group(sk, imr, mode); 2214 } 2215 2216 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 2217 struct in_device *in_dev) 2218 { 2219 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 2220 int err; 2221 2222 if (!psf) { 2223 /* any-source empty exclude case */ 2224 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2225 iml->sfmode, 0, NULL, 0); 2226 } 2227 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2228 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 2229 RCU_INIT_POINTER(iml->sflist, NULL); 2230 /* decrease mem now to avoid the memleak warning */ 2231 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 2232 kfree_rcu(psf, rcu); 2233 return err; 2234 } 2235 2236 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 2237 { 2238 struct inet_sock *inet = inet_sk(sk); 2239 struct ip_mc_socklist *iml; 2240 struct ip_mc_socklist __rcu **imlp; 2241 struct in_device *in_dev; 2242 struct net *net = sock_net(sk); 2243 __be32 group = imr->imr_multiaddr.s_addr; 2244 u32 ifindex; 2245 int ret = -EADDRNOTAVAIL; 2246 2247 ASSERT_RTNL(); 2248 2249 in_dev = ip_mc_find_dev(net, imr); 2250 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { 2251 ret = -ENODEV; 2252 goto out; 2253 } 2254 ifindex = imr->imr_ifindex; 2255 for (imlp = &inet->mc_list; 2256 (iml = rtnl_dereference(*imlp)) != NULL; 2257 imlp = &iml->next_rcu) { 2258 if (iml->multi.imr_multiaddr.s_addr != group) 2259 continue; 2260 if (ifindex) { 2261 if (iml->multi.imr_ifindex != ifindex) 2262 continue; 2263 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 2264 iml->multi.imr_address.s_addr) 2265 continue; 2266 2267 (void) ip_mc_leave_src(sk, iml, in_dev); 2268 2269 *imlp = iml->next_rcu; 2270 2271 if (in_dev) 2272 ip_mc_dec_group(in_dev, group); 2273 2274 /* decrease mem now to avoid the memleak warning */ 2275 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2276 kfree_rcu(iml, rcu); 2277 return 0; 2278 } 2279 out: 2280 return ret; 2281 } 2282 EXPORT_SYMBOL(ip_mc_leave_group); 2283 2284 int ip_mc_source(int add, int omode, struct sock *sk, struct 2285 ip_mreq_source *mreqs, int ifindex) 2286 { 2287 int err; 2288 struct ip_mreqn imr; 2289 __be32 addr = mreqs->imr_multiaddr; 2290 struct ip_mc_socklist *pmc; 2291 struct in_device *in_dev = NULL; 2292 struct inet_sock *inet = inet_sk(sk); 2293 struct ip_sf_socklist *psl; 2294 struct net *net = sock_net(sk); 2295 int leavegroup = 0; 2296 int i, j, rv; 2297 2298 if (!ipv4_is_multicast(addr)) 2299 return -EINVAL; 2300 2301 ASSERT_RTNL(); 2302 2303 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2304 imr.imr_address.s_addr = mreqs->imr_interface; 2305 imr.imr_ifindex = ifindex; 2306 in_dev = ip_mc_find_dev(net, &imr); 2307 2308 if (!in_dev) { 2309 err = -ENODEV; 2310 goto done; 2311 } 2312 err = -EADDRNOTAVAIL; 2313 2314 for_each_pmc_rtnl(inet, pmc) { 2315 if ((pmc->multi.imr_multiaddr.s_addr == 2316 imr.imr_multiaddr.s_addr) && 2317 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2318 break; 2319 } 2320 if (!pmc) { /* must have a prior join */ 2321 err = -EINVAL; 2322 goto done; 2323 } 2324 /* if a source filter was set, must be the same mode as before */ 2325 if (pmc->sflist) { 2326 if (pmc->sfmode != omode) { 2327 err = -EINVAL; 2328 goto done; 2329 } 2330 } else if (pmc->sfmode != omode) { 2331 /* allow mode switches for empty-set filters */ 2332 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2333 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2334 NULL, 0); 2335 pmc->sfmode = omode; 2336 } 2337 2338 psl = rtnl_dereference(pmc->sflist); 2339 if (!add) { 2340 if (!psl) 2341 goto done; /* err = -EADDRNOTAVAIL */ 2342 rv = !0; 2343 for (i = 0; i < psl->sl_count; i++) { 2344 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2345 sizeof(__be32)); 2346 if (rv == 0) 2347 break; 2348 } 2349 if (rv) /* source not found */ 2350 goto done; /* err = -EADDRNOTAVAIL */ 2351 2352 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2353 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2354 leavegroup = 1; 2355 goto done; 2356 } 2357 2358 /* update the interface filter */ 2359 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2360 &mreqs->imr_sourceaddr, 1); 2361 2362 for (j = i+1; j < psl->sl_count; j++) 2363 psl->sl_addr[j-1] = psl->sl_addr[j]; 2364 psl->sl_count--; 2365 err = 0; 2366 goto done; 2367 } 2368 /* else, add a new source to the filter */ 2369 2370 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { 2371 err = -ENOBUFS; 2372 goto done; 2373 } 2374 if (!psl || psl->sl_count == psl->sl_max) { 2375 struct ip_sf_socklist *newpsl; 2376 int count = IP_SFBLOCK; 2377 2378 if (psl) 2379 count += psl->sl_max; 2380 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2381 if (!newpsl) { 2382 err = -ENOBUFS; 2383 goto done; 2384 } 2385 newpsl->sl_max = count; 2386 newpsl->sl_count = count - IP_SFBLOCK; 2387 if (psl) { 2388 for (i = 0; i < psl->sl_count; i++) 2389 newpsl->sl_addr[i] = psl->sl_addr[i]; 2390 /* decrease mem now to avoid the memleak warning */ 2391 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2392 kfree_rcu(psl, rcu); 2393 } 2394 rcu_assign_pointer(pmc->sflist, newpsl); 2395 psl = newpsl; 2396 } 2397 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2398 for (i = 0; i < psl->sl_count; i++) { 2399 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2400 sizeof(__be32)); 2401 if (rv == 0) 2402 break; 2403 } 2404 if (rv == 0) /* address already there is an error */ 2405 goto done; 2406 for (j = psl->sl_count-1; j >= i; j--) 2407 psl->sl_addr[j+1] = psl->sl_addr[j]; 2408 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2409 psl->sl_count++; 2410 err = 0; 2411 /* update the interface list */ 2412 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2413 &mreqs->imr_sourceaddr, 1); 2414 done: 2415 if (leavegroup) 2416 err = ip_mc_leave_group(sk, &imr); 2417 return err; 2418 } 2419 2420 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2421 { 2422 int err = 0; 2423 struct ip_mreqn imr; 2424 __be32 addr = msf->imsf_multiaddr; 2425 struct ip_mc_socklist *pmc; 2426 struct in_device *in_dev; 2427 struct inet_sock *inet = inet_sk(sk); 2428 struct ip_sf_socklist *newpsl, *psl; 2429 struct net *net = sock_net(sk); 2430 int leavegroup = 0; 2431 2432 if (!ipv4_is_multicast(addr)) 2433 return -EINVAL; 2434 if (msf->imsf_fmode != MCAST_INCLUDE && 2435 msf->imsf_fmode != MCAST_EXCLUDE) 2436 return -EINVAL; 2437 2438 ASSERT_RTNL(); 2439 2440 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2441 imr.imr_address.s_addr = msf->imsf_interface; 2442 imr.imr_ifindex = ifindex; 2443 in_dev = ip_mc_find_dev(net, &imr); 2444 2445 if (!in_dev) { 2446 err = -ENODEV; 2447 goto done; 2448 } 2449 2450 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2451 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2452 leavegroup = 1; 2453 goto done; 2454 } 2455 2456 for_each_pmc_rtnl(inet, pmc) { 2457 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2458 pmc->multi.imr_ifindex == imr.imr_ifindex) 2459 break; 2460 } 2461 if (!pmc) { /* must have a prior join */ 2462 err = -EINVAL; 2463 goto done; 2464 } 2465 if (msf->imsf_numsrc) { 2466 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2467 GFP_KERNEL); 2468 if (!newpsl) { 2469 err = -ENOBUFS; 2470 goto done; 2471 } 2472 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2473 memcpy(newpsl->sl_addr, msf->imsf_slist, 2474 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2475 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2476 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2477 if (err) { 2478 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2479 goto done; 2480 } 2481 } else { 2482 newpsl = NULL; 2483 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2484 msf->imsf_fmode, 0, NULL, 0); 2485 } 2486 psl = rtnl_dereference(pmc->sflist); 2487 if (psl) { 2488 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2489 psl->sl_count, psl->sl_addr, 0); 2490 /* decrease mem now to avoid the memleak warning */ 2491 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2492 kfree_rcu(psl, rcu); 2493 } else 2494 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2495 0, NULL, 0); 2496 rcu_assign_pointer(pmc->sflist, newpsl); 2497 pmc->sfmode = msf->imsf_fmode; 2498 err = 0; 2499 done: 2500 if (leavegroup) 2501 err = ip_mc_leave_group(sk, &imr); 2502 return err; 2503 } 2504 2505 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2506 struct ip_msfilter __user *optval, int __user *optlen) 2507 { 2508 int err, len, count, copycount; 2509 struct ip_mreqn imr; 2510 __be32 addr = msf->imsf_multiaddr; 2511 struct ip_mc_socklist *pmc; 2512 struct in_device *in_dev; 2513 struct inet_sock *inet = inet_sk(sk); 2514 struct ip_sf_socklist *psl; 2515 struct net *net = sock_net(sk); 2516 2517 ASSERT_RTNL(); 2518 2519 if (!ipv4_is_multicast(addr)) 2520 return -EINVAL; 2521 2522 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2523 imr.imr_address.s_addr = msf->imsf_interface; 2524 imr.imr_ifindex = 0; 2525 in_dev = ip_mc_find_dev(net, &imr); 2526 2527 if (!in_dev) { 2528 err = -ENODEV; 2529 goto done; 2530 } 2531 err = -EADDRNOTAVAIL; 2532 2533 for_each_pmc_rtnl(inet, pmc) { 2534 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2535 pmc->multi.imr_ifindex == imr.imr_ifindex) 2536 break; 2537 } 2538 if (!pmc) /* must have a prior join */ 2539 goto done; 2540 msf->imsf_fmode = pmc->sfmode; 2541 psl = rtnl_dereference(pmc->sflist); 2542 if (!psl) { 2543 len = 0; 2544 count = 0; 2545 } else { 2546 count = psl->sl_count; 2547 } 2548 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2549 len = copycount * sizeof(psl->sl_addr[0]); 2550 msf->imsf_numsrc = count; 2551 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2552 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2553 return -EFAULT; 2554 } 2555 if (len && 2556 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2557 return -EFAULT; 2558 return 0; 2559 done: 2560 return err; 2561 } 2562 2563 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2564 struct group_filter __user *optval, int __user *optlen) 2565 { 2566 int err, i, count, copycount; 2567 struct sockaddr_in *psin; 2568 __be32 addr; 2569 struct ip_mc_socklist *pmc; 2570 struct inet_sock *inet = inet_sk(sk); 2571 struct ip_sf_socklist *psl; 2572 2573 ASSERT_RTNL(); 2574 2575 psin = (struct sockaddr_in *)&gsf->gf_group; 2576 if (psin->sin_family != AF_INET) 2577 return -EINVAL; 2578 addr = psin->sin_addr.s_addr; 2579 if (!ipv4_is_multicast(addr)) 2580 return -EINVAL; 2581 2582 err = -EADDRNOTAVAIL; 2583 2584 for_each_pmc_rtnl(inet, pmc) { 2585 if (pmc->multi.imr_multiaddr.s_addr == addr && 2586 pmc->multi.imr_ifindex == gsf->gf_interface) 2587 break; 2588 } 2589 if (!pmc) /* must have a prior join */ 2590 goto done; 2591 gsf->gf_fmode = pmc->sfmode; 2592 psl = rtnl_dereference(pmc->sflist); 2593 count = psl ? psl->sl_count : 0; 2594 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2595 gsf->gf_numsrc = count; 2596 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2597 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2598 return -EFAULT; 2599 } 2600 for (i = 0; i < copycount; i++) { 2601 struct sockaddr_storage ss; 2602 2603 psin = (struct sockaddr_in *)&ss; 2604 memset(&ss, 0, sizeof(ss)); 2605 psin->sin_family = AF_INET; 2606 psin->sin_addr.s_addr = psl->sl_addr[i]; 2607 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2608 return -EFAULT; 2609 } 2610 return 0; 2611 done: 2612 return err; 2613 } 2614 2615 /* 2616 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2617 */ 2618 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, 2619 int dif, int sdif) 2620 { 2621 struct inet_sock *inet = inet_sk(sk); 2622 struct ip_mc_socklist *pmc; 2623 struct ip_sf_socklist *psl; 2624 int i; 2625 int ret; 2626 2627 ret = 1; 2628 if (!ipv4_is_multicast(loc_addr)) 2629 goto out; 2630 2631 rcu_read_lock(); 2632 for_each_pmc_rcu(inet, pmc) { 2633 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2634 (pmc->multi.imr_ifindex == dif || 2635 (sdif && pmc->multi.imr_ifindex == sdif))) 2636 break; 2637 } 2638 ret = inet->mc_all; 2639 if (!pmc) 2640 goto unlock; 2641 psl = rcu_dereference(pmc->sflist); 2642 ret = (pmc->sfmode == MCAST_EXCLUDE); 2643 if (!psl) 2644 goto unlock; 2645 2646 for (i = 0; i < psl->sl_count; i++) { 2647 if (psl->sl_addr[i] == rmt_addr) 2648 break; 2649 } 2650 ret = 0; 2651 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2652 goto unlock; 2653 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2654 goto unlock; 2655 ret = 1; 2656 unlock: 2657 rcu_read_unlock(); 2658 out: 2659 return ret; 2660 } 2661 2662 /* 2663 * A socket is closing. 2664 */ 2665 2666 void ip_mc_drop_socket(struct sock *sk) 2667 { 2668 struct inet_sock *inet = inet_sk(sk); 2669 struct ip_mc_socklist *iml; 2670 struct net *net = sock_net(sk); 2671 2672 if (!inet->mc_list) 2673 return; 2674 2675 rtnl_lock(); 2676 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2677 struct in_device *in_dev; 2678 2679 inet->mc_list = iml->next_rcu; 2680 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2681 (void) ip_mc_leave_src(sk, iml, in_dev); 2682 if (in_dev) 2683 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2684 /* decrease mem now to avoid the memleak warning */ 2685 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2686 kfree_rcu(iml, rcu); 2687 } 2688 rtnl_unlock(); 2689 } 2690 2691 /* called with rcu_read_lock() */ 2692 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) 2693 { 2694 struct ip_mc_list *im; 2695 struct ip_mc_list __rcu **mc_hash; 2696 struct ip_sf_list *psf; 2697 int rv = 0; 2698 2699 mc_hash = rcu_dereference(in_dev->mc_hash); 2700 if (mc_hash) { 2701 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2702 2703 for (im = rcu_dereference(mc_hash[hash]); 2704 im != NULL; 2705 im = rcu_dereference(im->next_hash)) { 2706 if (im->multiaddr == mc_addr) 2707 break; 2708 } 2709 } else { 2710 for_each_pmc_rcu(in_dev, im) { 2711 if (im->multiaddr == mc_addr) 2712 break; 2713 } 2714 } 2715 if (im && proto == IPPROTO_IGMP) { 2716 rv = 1; 2717 } else if (im) { 2718 if (src_addr) { 2719 for (psf = im->sources; psf; psf = psf->sf_next) { 2720 if (psf->sf_inaddr == src_addr) 2721 break; 2722 } 2723 if (psf) 2724 rv = psf->sf_count[MCAST_INCLUDE] || 2725 psf->sf_count[MCAST_EXCLUDE] != 2726 im->sfcount[MCAST_EXCLUDE]; 2727 else 2728 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2729 } else 2730 rv = 1; /* unspecified source; tentatively allow */ 2731 } 2732 return rv; 2733 } 2734 2735 #if defined(CONFIG_PROC_FS) 2736 struct igmp_mc_iter_state { 2737 struct seq_net_private p; 2738 struct net_device *dev; 2739 struct in_device *in_dev; 2740 }; 2741 2742 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2743 2744 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2745 { 2746 struct net *net = seq_file_net(seq); 2747 struct ip_mc_list *im = NULL; 2748 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2749 2750 state->in_dev = NULL; 2751 for_each_netdev_rcu(net, state->dev) { 2752 struct in_device *in_dev; 2753 2754 in_dev = __in_dev_get_rcu(state->dev); 2755 if (!in_dev) 2756 continue; 2757 im = rcu_dereference(in_dev->mc_list); 2758 if (im) { 2759 state->in_dev = in_dev; 2760 break; 2761 } 2762 } 2763 return im; 2764 } 2765 2766 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2767 { 2768 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2769 2770 im = rcu_dereference(im->next_rcu); 2771 while (!im) { 2772 state->dev = next_net_device_rcu(state->dev); 2773 if (!state->dev) { 2774 state->in_dev = NULL; 2775 break; 2776 } 2777 state->in_dev = __in_dev_get_rcu(state->dev); 2778 if (!state->in_dev) 2779 continue; 2780 im = rcu_dereference(state->in_dev->mc_list); 2781 } 2782 return im; 2783 } 2784 2785 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2786 { 2787 struct ip_mc_list *im = igmp_mc_get_first(seq); 2788 if (im) 2789 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2790 --pos; 2791 return pos ? NULL : im; 2792 } 2793 2794 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2795 __acquires(rcu) 2796 { 2797 rcu_read_lock(); 2798 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2799 } 2800 2801 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2802 { 2803 struct ip_mc_list *im; 2804 if (v == SEQ_START_TOKEN) 2805 im = igmp_mc_get_first(seq); 2806 else 2807 im = igmp_mc_get_next(seq, v); 2808 ++*pos; 2809 return im; 2810 } 2811 2812 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2813 __releases(rcu) 2814 { 2815 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2816 2817 state->in_dev = NULL; 2818 state->dev = NULL; 2819 rcu_read_unlock(); 2820 } 2821 2822 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2823 { 2824 if (v == SEQ_START_TOKEN) 2825 seq_puts(seq, 2826 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2827 else { 2828 struct ip_mc_list *im = (struct ip_mc_list *)v; 2829 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2830 char *querier; 2831 long delta; 2832 2833 #ifdef CONFIG_IP_MULTICAST 2834 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2835 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2836 "V3"; 2837 #else 2838 querier = "NONE"; 2839 #endif 2840 2841 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2842 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2843 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2844 } 2845 2846 delta = im->timer.expires - jiffies; 2847 seq_printf(seq, 2848 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2849 im->multiaddr, im->users, 2850 im->tm_running, 2851 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2852 im->reporter); 2853 } 2854 return 0; 2855 } 2856 2857 static const struct seq_operations igmp_mc_seq_ops = { 2858 .start = igmp_mc_seq_start, 2859 .next = igmp_mc_seq_next, 2860 .stop = igmp_mc_seq_stop, 2861 .show = igmp_mc_seq_show, 2862 }; 2863 2864 struct igmp_mcf_iter_state { 2865 struct seq_net_private p; 2866 struct net_device *dev; 2867 struct in_device *idev; 2868 struct ip_mc_list *im; 2869 }; 2870 2871 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2872 2873 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2874 { 2875 struct net *net = seq_file_net(seq); 2876 struct ip_sf_list *psf = NULL; 2877 struct ip_mc_list *im = NULL; 2878 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2879 2880 state->idev = NULL; 2881 state->im = NULL; 2882 for_each_netdev_rcu(net, state->dev) { 2883 struct in_device *idev; 2884 idev = __in_dev_get_rcu(state->dev); 2885 if (unlikely(!idev)) 2886 continue; 2887 im = rcu_dereference(idev->mc_list); 2888 if (likely(im)) { 2889 spin_lock_bh(&im->lock); 2890 psf = im->sources; 2891 if (likely(psf)) { 2892 state->im = im; 2893 state->idev = idev; 2894 break; 2895 } 2896 spin_unlock_bh(&im->lock); 2897 } 2898 } 2899 return psf; 2900 } 2901 2902 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2903 { 2904 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2905 2906 psf = psf->sf_next; 2907 while (!psf) { 2908 spin_unlock_bh(&state->im->lock); 2909 state->im = state->im->next; 2910 while (!state->im) { 2911 state->dev = next_net_device_rcu(state->dev); 2912 if (!state->dev) { 2913 state->idev = NULL; 2914 goto out; 2915 } 2916 state->idev = __in_dev_get_rcu(state->dev); 2917 if (!state->idev) 2918 continue; 2919 state->im = rcu_dereference(state->idev->mc_list); 2920 } 2921 if (!state->im) 2922 break; 2923 spin_lock_bh(&state->im->lock); 2924 psf = state->im->sources; 2925 } 2926 out: 2927 return psf; 2928 } 2929 2930 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2931 { 2932 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2933 if (psf) 2934 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2935 --pos; 2936 return pos ? NULL : psf; 2937 } 2938 2939 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2940 __acquires(rcu) 2941 { 2942 rcu_read_lock(); 2943 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2944 } 2945 2946 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2947 { 2948 struct ip_sf_list *psf; 2949 if (v == SEQ_START_TOKEN) 2950 psf = igmp_mcf_get_first(seq); 2951 else 2952 psf = igmp_mcf_get_next(seq, v); 2953 ++*pos; 2954 return psf; 2955 } 2956 2957 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2958 __releases(rcu) 2959 { 2960 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2961 if (likely(state->im)) { 2962 spin_unlock_bh(&state->im->lock); 2963 state->im = NULL; 2964 } 2965 state->idev = NULL; 2966 state->dev = NULL; 2967 rcu_read_unlock(); 2968 } 2969 2970 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2971 { 2972 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2973 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2974 2975 if (v == SEQ_START_TOKEN) { 2976 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2977 } else { 2978 seq_printf(seq, 2979 "%3d %6.6s 0x%08x " 2980 "0x%08x %6lu %6lu\n", 2981 state->dev->ifindex, state->dev->name, 2982 ntohl(state->im->multiaddr), 2983 ntohl(psf->sf_inaddr), 2984 psf->sf_count[MCAST_INCLUDE], 2985 psf->sf_count[MCAST_EXCLUDE]); 2986 } 2987 return 0; 2988 } 2989 2990 static const struct seq_operations igmp_mcf_seq_ops = { 2991 .start = igmp_mcf_seq_start, 2992 .next = igmp_mcf_seq_next, 2993 .stop = igmp_mcf_seq_stop, 2994 .show = igmp_mcf_seq_show, 2995 }; 2996 2997 static int __net_init igmp_net_init(struct net *net) 2998 { 2999 struct proc_dir_entry *pde; 3000 int err; 3001 3002 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, 3003 sizeof(struct igmp_mc_iter_state)); 3004 if (!pde) 3005 goto out_igmp; 3006 pde = proc_create_net("mcfilter", 0444, net->proc_net, 3007 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); 3008 if (!pde) 3009 goto out_mcfilter; 3010 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, 3011 SOCK_DGRAM, 0, net); 3012 if (err < 0) { 3013 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", 3014 err); 3015 goto out_sock; 3016 } 3017 3018 return 0; 3019 3020 out_sock: 3021 remove_proc_entry("mcfilter", net->proc_net); 3022 out_mcfilter: 3023 remove_proc_entry("igmp", net->proc_net); 3024 out_igmp: 3025 return -ENOMEM; 3026 } 3027 3028 static void __net_exit igmp_net_exit(struct net *net) 3029 { 3030 remove_proc_entry("mcfilter", net->proc_net); 3031 remove_proc_entry("igmp", net->proc_net); 3032 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); 3033 } 3034 3035 static struct pernet_operations igmp_net_ops = { 3036 .init = igmp_net_init, 3037 .exit = igmp_net_exit, 3038 }; 3039 #endif 3040 3041 static int igmp_netdev_event(struct notifier_block *this, 3042 unsigned long event, void *ptr) 3043 { 3044 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3045 struct in_device *in_dev; 3046 3047 switch (event) { 3048 case NETDEV_RESEND_IGMP: 3049 in_dev = __in_dev_get_rtnl(dev); 3050 if (in_dev) 3051 ip_mc_rejoin_groups(in_dev); 3052 break; 3053 default: 3054 break; 3055 } 3056 return NOTIFY_DONE; 3057 } 3058 3059 static struct notifier_block igmp_notifier = { 3060 .notifier_call = igmp_netdev_event, 3061 }; 3062 3063 int __init igmp_mc_init(void) 3064 { 3065 #if defined(CONFIG_PROC_FS) 3066 int err; 3067 3068 err = register_pernet_subsys(&igmp_net_ops); 3069 if (err) 3070 return err; 3071 err = register_netdevice_notifier(&igmp_notifier); 3072 if (err) 3073 goto reg_notif_fail; 3074 return 0; 3075 3076 reg_notif_fail: 3077 unregister_pernet_subsys(&igmp_net_ops); 3078 return err; 3079 #else 3080 return register_netdevice_notifier(&igmp_notifier); 3081 #endif 3082 } 3083