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_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) 115 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) 116 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) 117 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) 118 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) 119 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 120 121 122 #define IGMP_INITIAL_REPORT_DELAY (1) 123 124 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! 125 * IGMP specs require to report membership immediately after 126 * joining a group, but we delay the first report by a 127 * small interval. It seems more natural and still does not 128 * contradict to specs provided this delay is small enough. 129 */ 130 131 #define IGMP_V1_SEEN(in_dev) \ 132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 134 ((in_dev)->mr_v1_seen && \ 135 time_before(jiffies, (in_dev)->mr_v1_seen))) 136 #define IGMP_V2_SEEN(in_dev) \ 137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 139 ((in_dev)->mr_v2_seen && \ 140 time_before(jiffies, (in_dev)->mr_v2_seen))) 141 142 static int unsolicited_report_interval(struct in_device *in_dev) 143 { 144 int interval_ms, interval_jiffies; 145 146 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 147 interval_ms = IN_DEV_CONF_GET( 148 in_dev, 149 IGMPV2_UNSOLICITED_REPORT_INTERVAL); 150 else /* v3 */ 151 interval_ms = IN_DEV_CONF_GET( 152 in_dev, 153 IGMPV3_UNSOLICITED_REPORT_INTERVAL); 154 155 interval_jiffies = msecs_to_jiffies(interval_ms); 156 157 /* _timer functions can't handle a delay of 0 jiffies so ensure 158 * we always return a positive value. 159 */ 160 if (interval_jiffies <= 0) 161 interval_jiffies = 1; 162 return interval_jiffies; 163 } 164 165 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 166 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); 167 static void igmpv3_clear_delrec(struct in_device *in_dev); 168 static int sf_setstate(struct ip_mc_list *pmc); 169 static void sf_markstate(struct ip_mc_list *pmc); 170 #endif 171 static void ip_mc_clear_src(struct ip_mc_list *pmc); 172 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 173 int sfcount, __be32 *psfsrc, int delta); 174 175 static void ip_ma_put(struct ip_mc_list *im) 176 { 177 if (refcount_dec_and_test(&im->refcnt)) { 178 in_dev_put(im->interface); 179 kfree_rcu(im, rcu); 180 } 181 } 182 183 #define for_each_pmc_rcu(in_dev, pmc) \ 184 for (pmc = rcu_dereference(in_dev->mc_list); \ 185 pmc != NULL; \ 186 pmc = rcu_dereference(pmc->next_rcu)) 187 188 #define for_each_pmc_rtnl(in_dev, pmc) \ 189 for (pmc = rtnl_dereference(in_dev->mc_list); \ 190 pmc != NULL; \ 191 pmc = rtnl_dereference(pmc->next_rcu)) 192 193 #ifdef CONFIG_IP_MULTICAST 194 195 /* 196 * Timer management 197 */ 198 199 static void igmp_stop_timer(struct ip_mc_list *im) 200 { 201 spin_lock_bh(&im->lock); 202 if (del_timer(&im->timer)) 203 refcount_dec(&im->refcnt); 204 im->tm_running = 0; 205 im->reporter = 0; 206 im->unsolicit_count = 0; 207 spin_unlock_bh(&im->lock); 208 } 209 210 /* It must be called with locked im->lock */ 211 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 212 { 213 int tv = prandom_u32() % max_delay; 214 215 im->tm_running = 1; 216 if (!mod_timer(&im->timer, jiffies+tv+2)) 217 refcount_inc(&im->refcnt); 218 } 219 220 static void igmp_gq_start_timer(struct in_device *in_dev) 221 { 222 int tv = prandom_u32() % in_dev->mr_maxdelay; 223 unsigned long exp = jiffies + tv + 2; 224 225 if (in_dev->mr_gq_running && 226 time_after_eq(exp, (in_dev->mr_gq_timer).expires)) 227 return; 228 229 in_dev->mr_gq_running = 1; 230 if (!mod_timer(&in_dev->mr_gq_timer, exp)) 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 refcount_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 /* source address selection per RFC 3376 section 4.2.13 */ 326 static __be32 igmpv3_get_srcaddr(struct net_device *dev, 327 const struct flowi4 *fl4) 328 { 329 struct in_device *in_dev = __in_dev_get_rcu(dev); 330 331 if (!in_dev) 332 return htonl(INADDR_ANY); 333 334 for_ifa(in_dev) { 335 if (fl4->saddr == ifa->ifa_local) 336 return fl4->saddr; 337 } endfor_ifa(in_dev); 338 339 return htonl(INADDR_ANY); 340 } 341 342 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) 343 { 344 struct sk_buff *skb; 345 struct rtable *rt; 346 struct iphdr *pip; 347 struct igmpv3_report *pig; 348 struct net *net = dev_net(dev); 349 struct flowi4 fl4; 350 int hlen = LL_RESERVED_SPACE(dev); 351 int tlen = dev->needed_tailroom; 352 unsigned int size = mtu; 353 354 while (1) { 355 skb = alloc_skb(size + hlen + tlen, 356 GFP_ATOMIC | __GFP_NOWARN); 357 if (skb) 358 break; 359 size >>= 1; 360 if (size < 256) 361 return NULL; 362 } 363 skb->priority = TC_PRIO_CONTROL; 364 365 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 366 0, 0, 367 IPPROTO_IGMP, 0, dev->ifindex); 368 if (IS_ERR(rt)) { 369 kfree_skb(skb); 370 return NULL; 371 } 372 373 skb_dst_set(skb, &rt->dst); 374 skb->dev = dev; 375 376 skb_reserve(skb, hlen); 377 skb_tailroom_reserve(skb, mtu, tlen); 378 379 skb_reset_network_header(skb); 380 pip = ip_hdr(skb); 381 skb_put(skb, sizeof(struct iphdr) + 4); 382 383 pip->version = 4; 384 pip->ihl = (sizeof(struct iphdr)+4)>>2; 385 pip->tos = 0xc0; 386 pip->frag_off = htons(IP_DF); 387 pip->ttl = 1; 388 pip->daddr = fl4.daddr; 389 390 rcu_read_lock(); 391 pip->saddr = igmpv3_get_srcaddr(dev, &fl4); 392 rcu_read_unlock(); 393 394 pip->protocol = IPPROTO_IGMP; 395 pip->tot_len = 0; /* filled in later */ 396 ip_select_ident(net, skb, NULL); 397 ((u8 *)&pip[1])[0] = IPOPT_RA; 398 ((u8 *)&pip[1])[1] = 4; 399 ((u8 *)&pip[1])[2] = 0; 400 ((u8 *)&pip[1])[3] = 0; 401 402 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 403 skb_put(skb, sizeof(*pig)); 404 pig = igmpv3_report_hdr(skb); 405 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 406 pig->resv1 = 0; 407 pig->csum = 0; 408 pig->resv2 = 0; 409 pig->ngrec = 0; 410 return skb; 411 } 412 413 static int igmpv3_sendpack(struct sk_buff *skb) 414 { 415 struct igmphdr *pig = igmp_hdr(skb); 416 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); 417 418 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 419 420 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 421 } 422 423 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 424 { 425 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 426 } 427 428 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 429 int type, struct igmpv3_grec **ppgr, unsigned int mtu) 430 { 431 struct net_device *dev = pmc->interface->dev; 432 struct igmpv3_report *pih; 433 struct igmpv3_grec *pgr; 434 435 if (!skb) { 436 skb = igmpv3_newpack(dev, mtu); 437 if (!skb) 438 return NULL; 439 } 440 pgr = skb_put(skb, sizeof(struct igmpv3_grec)); 441 pgr->grec_type = type; 442 pgr->grec_auxwords = 0; 443 pgr->grec_nsrcs = 0; 444 pgr->grec_mca = pmc->multiaddr; 445 pih = igmpv3_report_hdr(skb); 446 pih->ngrec = htons(ntohs(pih->ngrec)+1); 447 *ppgr = pgr; 448 return skb; 449 } 450 451 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 452 453 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 454 int type, int gdeleted, int sdeleted) 455 { 456 struct net_device *dev = pmc->interface->dev; 457 struct net *net = dev_net(dev); 458 struct igmpv3_report *pih; 459 struct igmpv3_grec *pgr = NULL; 460 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 461 int scount, stotal, first, isquery, truncate; 462 unsigned int mtu; 463 464 if (pmc->multiaddr == IGMP_ALL_HOSTS) 465 return skb; 466 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 467 return skb; 468 469 mtu = READ_ONCE(dev->mtu); 470 if (mtu < IPV4_MIN_MTU) 471 return skb; 472 473 isquery = type == IGMPV3_MODE_IS_INCLUDE || 474 type == IGMPV3_MODE_IS_EXCLUDE; 475 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 476 type == IGMPV3_CHANGE_TO_EXCLUDE; 477 478 stotal = scount = 0; 479 480 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 481 482 if (!*psf_list) 483 goto empty_source; 484 485 pih = skb ? igmpv3_report_hdr(skb) : NULL; 486 487 /* EX and TO_EX get a fresh packet, if needed */ 488 if (truncate) { 489 if (pih && pih->ngrec && 490 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 491 if (skb) 492 igmpv3_sendpack(skb); 493 skb = igmpv3_newpack(dev, mtu); 494 } 495 } 496 first = 1; 497 psf_prev = NULL; 498 for (psf = *psf_list; psf; psf = psf_next) { 499 __be32 *psrc; 500 501 psf_next = psf->sf_next; 502 503 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 504 psf_prev = psf; 505 continue; 506 } 507 508 /* Based on RFC3376 5.1. Should not send source-list change 509 * records when there is a filter mode change. 510 */ 511 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || 512 (!gdeleted && pmc->crcount)) && 513 (type == IGMPV3_ALLOW_NEW_SOURCES || 514 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) 515 goto decrease_sf_crcount; 516 517 /* clear marks on query responses */ 518 if (isquery) 519 psf->sf_gsresp = 0; 520 521 if (AVAILABLE(skb) < sizeof(__be32) + 522 first*sizeof(struct igmpv3_grec)) { 523 if (truncate && !first) 524 break; /* truncate these */ 525 if (pgr) 526 pgr->grec_nsrcs = htons(scount); 527 if (skb) 528 igmpv3_sendpack(skb); 529 skb = igmpv3_newpack(dev, mtu); 530 first = 1; 531 scount = 0; 532 } 533 if (first) { 534 skb = add_grhead(skb, pmc, type, &pgr, mtu); 535 first = 0; 536 } 537 if (!skb) 538 return NULL; 539 psrc = skb_put(skb, sizeof(__be32)); 540 *psrc = psf->sf_inaddr; 541 scount++; stotal++; 542 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 543 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 544 decrease_sf_crcount: 545 psf->sf_crcount--; 546 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 547 if (psf_prev) 548 psf_prev->sf_next = psf->sf_next; 549 else 550 *psf_list = psf->sf_next; 551 kfree(psf); 552 continue; 553 } 554 } 555 psf_prev = psf; 556 } 557 558 empty_source: 559 if (!stotal) { 560 if (type == IGMPV3_ALLOW_NEW_SOURCES || 561 type == IGMPV3_BLOCK_OLD_SOURCES) 562 return skb; 563 if (pmc->crcount || isquery) { 564 /* make sure we have room for group header */ 565 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { 566 igmpv3_sendpack(skb); 567 skb = NULL; /* add_grhead will get a new one */ 568 } 569 skb = add_grhead(skb, pmc, type, &pgr, mtu); 570 } 571 } 572 if (pgr) 573 pgr->grec_nsrcs = htons(scount); 574 575 if (isquery) 576 pmc->gsquery = 0; /* clear query state on report */ 577 return skb; 578 } 579 580 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 581 { 582 struct sk_buff *skb = NULL; 583 struct net *net = dev_net(in_dev->dev); 584 int type; 585 586 if (!pmc) { 587 rcu_read_lock(); 588 for_each_pmc_rcu(in_dev, pmc) { 589 if (pmc->multiaddr == IGMP_ALL_HOSTS) 590 continue; 591 if (ipv4_is_local_multicast(pmc->multiaddr) && 592 !net->ipv4.sysctl_igmp_llm_reports) 593 continue; 594 spin_lock_bh(&pmc->lock); 595 if (pmc->sfcount[MCAST_EXCLUDE]) 596 type = IGMPV3_MODE_IS_EXCLUDE; 597 else 598 type = IGMPV3_MODE_IS_INCLUDE; 599 skb = add_grec(skb, pmc, type, 0, 0); 600 spin_unlock_bh(&pmc->lock); 601 } 602 rcu_read_unlock(); 603 } else { 604 spin_lock_bh(&pmc->lock); 605 if (pmc->sfcount[MCAST_EXCLUDE]) 606 type = IGMPV3_MODE_IS_EXCLUDE; 607 else 608 type = IGMPV3_MODE_IS_INCLUDE; 609 skb = add_grec(skb, pmc, type, 0, 0); 610 spin_unlock_bh(&pmc->lock); 611 } 612 if (!skb) 613 return 0; 614 return igmpv3_sendpack(skb); 615 } 616 617 /* 618 * remove zero-count source records from a source filter list 619 */ 620 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 621 { 622 struct ip_sf_list *psf_prev, *psf_next, *psf; 623 624 psf_prev = NULL; 625 for (psf = *ppsf; psf; psf = psf_next) { 626 psf_next = psf->sf_next; 627 if (psf->sf_crcount == 0) { 628 if (psf_prev) 629 psf_prev->sf_next = psf->sf_next; 630 else 631 *ppsf = psf->sf_next; 632 kfree(psf); 633 } else 634 psf_prev = psf; 635 } 636 } 637 638 static void igmpv3_send_cr(struct in_device *in_dev) 639 { 640 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 641 struct sk_buff *skb = NULL; 642 int type, dtype; 643 644 rcu_read_lock(); 645 spin_lock_bh(&in_dev->mc_tomb_lock); 646 647 /* deleted MCA's */ 648 pmc_prev = NULL; 649 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { 650 pmc_next = pmc->next; 651 if (pmc->sfmode == MCAST_INCLUDE) { 652 type = IGMPV3_BLOCK_OLD_SOURCES; 653 dtype = IGMPV3_BLOCK_OLD_SOURCES; 654 skb = add_grec(skb, pmc, type, 1, 0); 655 skb = add_grec(skb, pmc, dtype, 1, 1); 656 } 657 if (pmc->crcount) { 658 if (pmc->sfmode == MCAST_EXCLUDE) { 659 type = IGMPV3_CHANGE_TO_INCLUDE; 660 skb = add_grec(skb, pmc, type, 1, 0); 661 } 662 pmc->crcount--; 663 if (pmc->crcount == 0) { 664 igmpv3_clear_zeros(&pmc->tomb); 665 igmpv3_clear_zeros(&pmc->sources); 666 } 667 } 668 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 669 if (pmc_prev) 670 pmc_prev->next = pmc_next; 671 else 672 in_dev->mc_tomb = pmc_next; 673 in_dev_put(pmc->interface); 674 kfree(pmc); 675 } else 676 pmc_prev = pmc; 677 } 678 spin_unlock_bh(&in_dev->mc_tomb_lock); 679 680 /* change recs */ 681 for_each_pmc_rcu(in_dev, pmc) { 682 spin_lock_bh(&pmc->lock); 683 if (pmc->sfcount[MCAST_EXCLUDE]) { 684 type = IGMPV3_BLOCK_OLD_SOURCES; 685 dtype = IGMPV3_ALLOW_NEW_SOURCES; 686 } else { 687 type = IGMPV3_ALLOW_NEW_SOURCES; 688 dtype = IGMPV3_BLOCK_OLD_SOURCES; 689 } 690 skb = add_grec(skb, pmc, type, 0, 0); 691 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 692 693 /* filter mode changes */ 694 if (pmc->crcount) { 695 if (pmc->sfmode == MCAST_EXCLUDE) 696 type = IGMPV3_CHANGE_TO_EXCLUDE; 697 else 698 type = IGMPV3_CHANGE_TO_INCLUDE; 699 skb = add_grec(skb, pmc, type, 0, 0); 700 pmc->crcount--; 701 } 702 spin_unlock_bh(&pmc->lock); 703 } 704 rcu_read_unlock(); 705 706 if (!skb) 707 return; 708 (void) igmpv3_sendpack(skb); 709 } 710 711 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 712 int type) 713 { 714 struct sk_buff *skb; 715 struct iphdr *iph; 716 struct igmphdr *ih; 717 struct rtable *rt; 718 struct net_device *dev = in_dev->dev; 719 struct net *net = dev_net(dev); 720 __be32 group = pmc ? pmc->multiaddr : 0; 721 struct flowi4 fl4; 722 __be32 dst; 723 int hlen, tlen; 724 725 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 726 return igmpv3_send_report(in_dev, pmc); 727 728 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 729 return 0; 730 731 if (type == IGMP_HOST_LEAVE_MESSAGE) 732 dst = IGMP_ALL_ROUTER; 733 else 734 dst = group; 735 736 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 737 0, 0, 738 IPPROTO_IGMP, 0, dev->ifindex); 739 if (IS_ERR(rt)) 740 return -1; 741 742 hlen = LL_RESERVED_SPACE(dev); 743 tlen = dev->needed_tailroom; 744 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 745 if (!skb) { 746 ip_rt_put(rt); 747 return -1; 748 } 749 skb->priority = TC_PRIO_CONTROL; 750 751 skb_dst_set(skb, &rt->dst); 752 753 skb_reserve(skb, hlen); 754 755 skb_reset_network_header(skb); 756 iph = ip_hdr(skb); 757 skb_put(skb, sizeof(struct iphdr) + 4); 758 759 iph->version = 4; 760 iph->ihl = (sizeof(struct iphdr)+4)>>2; 761 iph->tos = 0xc0; 762 iph->frag_off = htons(IP_DF); 763 iph->ttl = 1; 764 iph->daddr = dst; 765 iph->saddr = fl4.saddr; 766 iph->protocol = IPPROTO_IGMP; 767 ip_select_ident(net, skb, NULL); 768 ((u8 *)&iph[1])[0] = IPOPT_RA; 769 ((u8 *)&iph[1])[1] = 4; 770 ((u8 *)&iph[1])[2] = 0; 771 ((u8 *)&iph[1])[3] = 0; 772 773 ih = skb_put(skb, sizeof(struct igmphdr)); 774 ih->type = type; 775 ih->code = 0; 776 ih->csum = 0; 777 ih->group = group; 778 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 779 780 return ip_local_out(net, skb->sk, skb); 781 } 782 783 static void igmp_gq_timer_expire(struct timer_list *t) 784 { 785 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); 786 787 in_dev->mr_gq_running = 0; 788 igmpv3_send_report(in_dev, NULL); 789 in_dev_put(in_dev); 790 } 791 792 static void igmp_ifc_timer_expire(struct timer_list *t) 793 { 794 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); 795 796 igmpv3_send_cr(in_dev); 797 if (in_dev->mr_ifc_count) { 798 in_dev->mr_ifc_count--; 799 igmp_ifc_start_timer(in_dev, 800 unsolicited_report_interval(in_dev)); 801 } 802 in_dev_put(in_dev); 803 } 804 805 static void igmp_ifc_event(struct in_device *in_dev) 806 { 807 struct net *net = dev_net(in_dev->dev); 808 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 809 return; 810 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 811 igmp_ifc_start_timer(in_dev, 1); 812 } 813 814 815 static void igmp_timer_expire(struct timer_list *t) 816 { 817 struct ip_mc_list *im = from_timer(im, t, timer); 818 struct in_device *in_dev = im->interface; 819 820 spin_lock(&im->lock); 821 im->tm_running = 0; 822 823 if (im->unsolicit_count) { 824 im->unsolicit_count--; 825 igmp_start_timer(im, unsolicited_report_interval(in_dev)); 826 } 827 im->reporter = 1; 828 spin_unlock(&im->lock); 829 830 if (IGMP_V1_SEEN(in_dev)) 831 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 832 else if (IGMP_V2_SEEN(in_dev)) 833 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 834 else 835 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 836 837 ip_ma_put(im); 838 } 839 840 /* mark EXCLUDE-mode sources */ 841 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 842 { 843 struct ip_sf_list *psf; 844 int i, scount; 845 846 scount = 0; 847 for (psf = pmc->sources; psf; psf = psf->sf_next) { 848 if (scount == nsrcs) 849 break; 850 for (i = 0; i < nsrcs; i++) { 851 /* skip inactive filters */ 852 if (psf->sf_count[MCAST_INCLUDE] || 853 pmc->sfcount[MCAST_EXCLUDE] != 854 psf->sf_count[MCAST_EXCLUDE]) 855 break; 856 if (srcs[i] == psf->sf_inaddr) { 857 scount++; 858 break; 859 } 860 } 861 } 862 pmc->gsquery = 0; 863 if (scount == nsrcs) /* all sources excluded */ 864 return 0; 865 return 1; 866 } 867 868 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 869 { 870 struct ip_sf_list *psf; 871 int i, scount; 872 873 if (pmc->sfmode == MCAST_EXCLUDE) 874 return igmp_xmarksources(pmc, nsrcs, srcs); 875 876 /* mark INCLUDE-mode sources */ 877 scount = 0; 878 for (psf = pmc->sources; psf; psf = psf->sf_next) { 879 if (scount == nsrcs) 880 break; 881 for (i = 0; i < nsrcs; i++) 882 if (srcs[i] == psf->sf_inaddr) { 883 psf->sf_gsresp = 1; 884 scount++; 885 break; 886 } 887 } 888 if (!scount) { 889 pmc->gsquery = 0; 890 return 0; 891 } 892 pmc->gsquery = 1; 893 return 1; 894 } 895 896 /* return true if packet was dropped */ 897 static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 898 { 899 struct ip_mc_list *im; 900 struct net *net = dev_net(in_dev->dev); 901 902 /* Timers are only set for non-local groups */ 903 904 if (group == IGMP_ALL_HOSTS) 905 return false; 906 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 907 return false; 908 909 rcu_read_lock(); 910 for_each_pmc_rcu(in_dev, im) { 911 if (im->multiaddr == group) { 912 igmp_stop_timer(im); 913 break; 914 } 915 } 916 rcu_read_unlock(); 917 return false; 918 } 919 920 /* return true if packet was dropped */ 921 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 922 int len) 923 { 924 struct igmphdr *ih = igmp_hdr(skb); 925 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 926 struct ip_mc_list *im; 927 __be32 group = ih->group; 928 int max_delay; 929 int mark = 0; 930 struct net *net = dev_net(in_dev->dev); 931 932 933 if (len == 8) { 934 if (ih->code == 0) { 935 /* Alas, old v1 router presents here. */ 936 937 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 938 in_dev->mr_v1_seen = jiffies + 939 IGMP_V1_ROUTER_PRESENT_TIMEOUT; 940 group = 0; 941 } else { 942 /* v2 router present */ 943 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 944 in_dev->mr_v2_seen = jiffies + 945 IGMP_V2_ROUTER_PRESENT_TIMEOUT; 946 } 947 /* cancel the interface change timer */ 948 in_dev->mr_ifc_count = 0; 949 if (del_timer(&in_dev->mr_ifc_timer)) 950 __in_dev_put(in_dev); 951 /* clear deleted report items */ 952 igmpv3_clear_delrec(in_dev); 953 } else if (len < 12) { 954 return true; /* ignore bogus packet; freed by caller */ 955 } else if (IGMP_V1_SEEN(in_dev)) { 956 /* This is a v3 query with v1 queriers present */ 957 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 958 group = 0; 959 } else if (IGMP_V2_SEEN(in_dev)) { 960 /* this is a v3 query with v2 queriers present; 961 * Interpretation of the max_delay code is problematic here. 962 * A real v2 host would use ih_code directly, while v3 has a 963 * different encoding. We use the v3 encoding as more likely 964 * to be intended in a v3 query. 965 */ 966 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 967 if (!max_delay) 968 max_delay = 1; /* can't mod w/ 0 */ 969 } else { /* v3 */ 970 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 971 return true; 972 973 ih3 = igmpv3_query_hdr(skb); 974 if (ih3->nsrcs) { 975 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 976 + ntohs(ih3->nsrcs)*sizeof(__be32))) 977 return true; 978 ih3 = igmpv3_query_hdr(skb); 979 } 980 981 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 982 if (!max_delay) 983 max_delay = 1; /* can't mod w/ 0 */ 984 in_dev->mr_maxdelay = max_delay; 985 if (ih3->qrv) 986 in_dev->mr_qrv = ih3->qrv; 987 if (!group) { /* general query */ 988 if (ih3->nsrcs) 989 return true; /* no sources allowed */ 990 igmp_gq_start_timer(in_dev); 991 return false; 992 } 993 /* mark sources to include, if group & source-specific */ 994 mark = ih3->nsrcs != 0; 995 } 996 997 /* 998 * - Start the timers in all of our membership records 999 * that the query applies to for the interface on 1000 * which the query arrived excl. those that belong 1001 * to a "local" group (224.0.0.X) 1002 * - For timers already running check if they need to 1003 * be reset. 1004 * - Use the igmp->igmp_code field as the maximum 1005 * delay possible 1006 */ 1007 rcu_read_lock(); 1008 for_each_pmc_rcu(in_dev, im) { 1009 int changed; 1010 1011 if (group && group != im->multiaddr) 1012 continue; 1013 if (im->multiaddr == IGMP_ALL_HOSTS) 1014 continue; 1015 if (ipv4_is_local_multicast(im->multiaddr) && 1016 !net->ipv4.sysctl_igmp_llm_reports) 1017 continue; 1018 spin_lock_bh(&im->lock); 1019 if (im->tm_running) 1020 im->gsquery = im->gsquery && mark; 1021 else 1022 im->gsquery = mark; 1023 changed = !im->gsquery || 1024 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 1025 spin_unlock_bh(&im->lock); 1026 if (changed) 1027 igmp_mod_timer(im, max_delay); 1028 } 1029 rcu_read_unlock(); 1030 return false; 1031 } 1032 1033 /* called in rcu_read_lock() section */ 1034 int igmp_rcv(struct sk_buff *skb) 1035 { 1036 /* This basically follows the spec line by line -- see RFC1112 */ 1037 struct igmphdr *ih; 1038 struct net_device *dev = skb->dev; 1039 struct in_device *in_dev; 1040 int len = skb->len; 1041 bool dropped = true; 1042 1043 if (netif_is_l3_master(dev)) { 1044 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); 1045 if (!dev) 1046 goto drop; 1047 } 1048 1049 in_dev = __in_dev_get_rcu(dev); 1050 if (!in_dev) 1051 goto drop; 1052 1053 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 1054 goto drop; 1055 1056 if (skb_checksum_simple_validate(skb)) 1057 goto drop; 1058 1059 ih = igmp_hdr(skb); 1060 switch (ih->type) { 1061 case IGMP_HOST_MEMBERSHIP_QUERY: 1062 dropped = igmp_heard_query(in_dev, skb, len); 1063 break; 1064 case IGMP_HOST_MEMBERSHIP_REPORT: 1065 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1066 /* Is it our report looped back? */ 1067 if (rt_is_output_route(skb_rtable(skb))) 1068 break; 1069 /* don't rely on MC router hearing unicast reports */ 1070 if (skb->pkt_type == PACKET_MULTICAST || 1071 skb->pkt_type == PACKET_BROADCAST) 1072 dropped = igmp_heard_report(in_dev, ih->group); 1073 break; 1074 case IGMP_PIM: 1075 #ifdef CONFIG_IP_PIMSM_V1 1076 return pim_rcv_v1(skb); 1077 #endif 1078 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1079 case IGMP_DVMRP: 1080 case IGMP_TRACE: 1081 case IGMP_HOST_LEAVE_MESSAGE: 1082 case IGMP_MTRACE: 1083 case IGMP_MTRACE_RESP: 1084 break; 1085 default: 1086 break; 1087 } 1088 1089 drop: 1090 if (dropped) 1091 kfree_skb(skb); 1092 else 1093 consume_skb(skb); 1094 return 0; 1095 } 1096 1097 #endif 1098 1099 1100 /* 1101 * Add a filter to a device 1102 */ 1103 1104 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1105 { 1106 char buf[MAX_ADDR_LEN]; 1107 struct net_device *dev = in_dev->dev; 1108 1109 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1110 We will get multicast token leakage, when IFF_MULTICAST 1111 is changed. This check should be done in ndo_set_rx_mode 1112 routine. Something sort of: 1113 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1114 --ANK 1115 */ 1116 if (arp_mc_map(addr, buf, dev, 0) == 0) 1117 dev_mc_add(dev, buf); 1118 } 1119 1120 /* 1121 * Remove a filter from a device 1122 */ 1123 1124 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1125 { 1126 char buf[MAX_ADDR_LEN]; 1127 struct net_device *dev = in_dev->dev; 1128 1129 if (arp_mc_map(addr, buf, dev, 0) == 0) 1130 dev_mc_del(dev, buf); 1131 } 1132 1133 #ifdef CONFIG_IP_MULTICAST 1134 /* 1135 * deleted ip_mc_list manipulation 1136 */ 1137 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1138 { 1139 struct ip_mc_list *pmc; 1140 struct net *net = dev_net(in_dev->dev); 1141 1142 /* this is an "ip_mc_list" for convenience; only the fields below 1143 * are actually used. In particular, the refcnt and users are not 1144 * used for management of the delete list. Using the same structure 1145 * for deleted items allows change reports to use common code with 1146 * non-deleted or query-response MCA's. 1147 */ 1148 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1149 if (!pmc) 1150 return; 1151 spin_lock_init(&pmc->lock); 1152 spin_lock_bh(&im->lock); 1153 pmc->interface = im->interface; 1154 in_dev_hold(in_dev); 1155 pmc->multiaddr = im->multiaddr; 1156 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1157 pmc->sfmode = im->sfmode; 1158 if (pmc->sfmode == MCAST_INCLUDE) { 1159 struct ip_sf_list *psf; 1160 1161 pmc->tomb = im->tomb; 1162 pmc->sources = im->sources; 1163 im->tomb = im->sources = NULL; 1164 for (psf = pmc->sources; psf; psf = psf->sf_next) 1165 psf->sf_crcount = pmc->crcount; 1166 } 1167 spin_unlock_bh(&im->lock); 1168 1169 spin_lock_bh(&in_dev->mc_tomb_lock); 1170 pmc->next = in_dev->mc_tomb; 1171 in_dev->mc_tomb = pmc; 1172 spin_unlock_bh(&in_dev->mc_tomb_lock); 1173 } 1174 1175 /* 1176 * restore ip_mc_list deleted records 1177 */ 1178 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1179 { 1180 struct ip_mc_list *pmc, *pmc_prev; 1181 struct ip_sf_list *psf; 1182 struct net *net = dev_net(in_dev->dev); 1183 __be32 multiaddr = im->multiaddr; 1184 1185 spin_lock_bh(&in_dev->mc_tomb_lock); 1186 pmc_prev = NULL; 1187 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1188 if (pmc->multiaddr == multiaddr) 1189 break; 1190 pmc_prev = pmc; 1191 } 1192 if (pmc) { 1193 if (pmc_prev) 1194 pmc_prev->next = pmc->next; 1195 else 1196 in_dev->mc_tomb = pmc->next; 1197 } 1198 spin_unlock_bh(&in_dev->mc_tomb_lock); 1199 1200 spin_lock_bh(&im->lock); 1201 if (pmc) { 1202 im->interface = pmc->interface; 1203 im->sfmode = pmc->sfmode; 1204 if (pmc->sfmode == MCAST_INCLUDE) { 1205 im->tomb = pmc->tomb; 1206 im->sources = pmc->sources; 1207 for (psf = im->sources; psf; psf = psf->sf_next) 1208 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1209 } else { 1210 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1211 } 1212 in_dev_put(pmc->interface); 1213 kfree(pmc); 1214 } 1215 spin_unlock_bh(&im->lock); 1216 } 1217 1218 /* 1219 * flush ip_mc_list deleted records 1220 */ 1221 static void igmpv3_clear_delrec(struct in_device *in_dev) 1222 { 1223 struct ip_mc_list *pmc, *nextpmc; 1224 1225 spin_lock_bh(&in_dev->mc_tomb_lock); 1226 pmc = in_dev->mc_tomb; 1227 in_dev->mc_tomb = NULL; 1228 spin_unlock_bh(&in_dev->mc_tomb_lock); 1229 1230 for (; pmc; pmc = nextpmc) { 1231 nextpmc = pmc->next; 1232 ip_mc_clear_src(pmc); 1233 in_dev_put(pmc->interface); 1234 kfree(pmc); 1235 } 1236 /* clear dead sources, too */ 1237 rcu_read_lock(); 1238 for_each_pmc_rcu(in_dev, pmc) { 1239 struct ip_sf_list *psf, *psf_next; 1240 1241 spin_lock_bh(&pmc->lock); 1242 psf = pmc->tomb; 1243 pmc->tomb = NULL; 1244 spin_unlock_bh(&pmc->lock); 1245 for (; psf; psf = psf_next) { 1246 psf_next = psf->sf_next; 1247 kfree(psf); 1248 } 1249 } 1250 rcu_read_unlock(); 1251 } 1252 #endif 1253 1254 static void igmp_group_dropped(struct ip_mc_list *im) 1255 { 1256 struct in_device *in_dev = im->interface; 1257 #ifdef CONFIG_IP_MULTICAST 1258 struct net *net = dev_net(in_dev->dev); 1259 int reporter; 1260 #endif 1261 1262 if (im->loaded) { 1263 im->loaded = 0; 1264 ip_mc_filter_del(in_dev, im->multiaddr); 1265 } 1266 1267 #ifdef CONFIG_IP_MULTICAST 1268 if (im->multiaddr == IGMP_ALL_HOSTS) 1269 return; 1270 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1271 return; 1272 1273 reporter = im->reporter; 1274 igmp_stop_timer(im); 1275 1276 if (!in_dev->dead) { 1277 if (IGMP_V1_SEEN(in_dev)) 1278 return; 1279 if (IGMP_V2_SEEN(in_dev)) { 1280 if (reporter) 1281 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1282 return; 1283 } 1284 /* IGMPv3 */ 1285 igmpv3_add_delrec(in_dev, im); 1286 1287 igmp_ifc_event(in_dev); 1288 } 1289 #endif 1290 } 1291 1292 static void igmp_group_added(struct ip_mc_list *im) 1293 { 1294 struct in_device *in_dev = im->interface; 1295 #ifdef CONFIG_IP_MULTICAST 1296 struct net *net = dev_net(in_dev->dev); 1297 #endif 1298 1299 if (im->loaded == 0) { 1300 im->loaded = 1; 1301 ip_mc_filter_add(in_dev, im->multiaddr); 1302 } 1303 1304 #ifdef CONFIG_IP_MULTICAST 1305 if (im->multiaddr == IGMP_ALL_HOSTS) 1306 return; 1307 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1308 return; 1309 1310 if (in_dev->dead) 1311 return; 1312 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1313 spin_lock_bh(&im->lock); 1314 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1315 spin_unlock_bh(&im->lock); 1316 return; 1317 } 1318 /* else, v3 */ 1319 1320 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should 1321 * not send filter-mode change record as the mode should be from 1322 * IN() to IN(A). 1323 */ 1324 if (im->sfmode == MCAST_EXCLUDE) 1325 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1326 1327 igmp_ifc_event(in_dev); 1328 #endif 1329 } 1330 1331 1332 /* 1333 * Multicast list managers 1334 */ 1335 1336 static u32 ip_mc_hash(const struct ip_mc_list *im) 1337 { 1338 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1339 } 1340 1341 static void ip_mc_hash_add(struct in_device *in_dev, 1342 struct ip_mc_list *im) 1343 { 1344 struct ip_mc_list __rcu **mc_hash; 1345 u32 hash; 1346 1347 mc_hash = rtnl_dereference(in_dev->mc_hash); 1348 if (mc_hash) { 1349 hash = ip_mc_hash(im); 1350 im->next_hash = mc_hash[hash]; 1351 rcu_assign_pointer(mc_hash[hash], im); 1352 return; 1353 } 1354 1355 /* do not use a hash table for small number of items */ 1356 if (in_dev->mc_count < 4) 1357 return; 1358 1359 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1360 GFP_KERNEL); 1361 if (!mc_hash) 1362 return; 1363 1364 for_each_pmc_rtnl(in_dev, im) { 1365 hash = ip_mc_hash(im); 1366 im->next_hash = mc_hash[hash]; 1367 RCU_INIT_POINTER(mc_hash[hash], im); 1368 } 1369 1370 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1371 } 1372 1373 static void ip_mc_hash_remove(struct in_device *in_dev, 1374 struct ip_mc_list *im) 1375 { 1376 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1377 struct ip_mc_list *aux; 1378 1379 if (!mc_hash) 1380 return; 1381 mc_hash += ip_mc_hash(im); 1382 while ((aux = rtnl_dereference(*mc_hash)) != im) 1383 mc_hash = &aux->next_hash; 1384 *mc_hash = im->next_hash; 1385 } 1386 1387 1388 /* 1389 * A socket has joined a multicast group on device dev. 1390 */ 1391 void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, unsigned int mode) 1392 { 1393 struct ip_mc_list *im; 1394 #ifdef CONFIG_IP_MULTICAST 1395 struct net *net = dev_net(in_dev->dev); 1396 #endif 1397 1398 ASSERT_RTNL(); 1399 1400 for_each_pmc_rtnl(in_dev, im) { 1401 if (im->multiaddr == addr) { 1402 im->users++; 1403 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); 1404 goto out; 1405 } 1406 } 1407 1408 im = kzalloc(sizeof(*im), GFP_KERNEL); 1409 if (!im) 1410 goto out; 1411 1412 im->users = 1; 1413 im->interface = in_dev; 1414 in_dev_hold(in_dev); 1415 im->multiaddr = addr; 1416 /* initial mode is (EX, empty) */ 1417 im->sfmode = mode; 1418 im->sfcount[mode] = 1; 1419 refcount_set(&im->refcnt, 1); 1420 spin_lock_init(&im->lock); 1421 #ifdef CONFIG_IP_MULTICAST 1422 timer_setup(&im->timer, igmp_timer_expire, 0); 1423 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; 1424 #endif 1425 1426 im->next_rcu = in_dev->mc_list; 1427 in_dev->mc_count++; 1428 rcu_assign_pointer(in_dev->mc_list, im); 1429 1430 ip_mc_hash_add(in_dev, im); 1431 1432 #ifdef CONFIG_IP_MULTICAST 1433 igmpv3_del_delrec(in_dev, im); 1434 #endif 1435 igmp_group_added(im); 1436 if (!in_dev->dead) 1437 ip_rt_multicast_event(in_dev); 1438 out: 1439 return; 1440 } 1441 1442 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1443 { 1444 __ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE); 1445 } 1446 EXPORT_SYMBOL(ip_mc_inc_group); 1447 1448 static int ip_mc_check_iphdr(struct sk_buff *skb) 1449 { 1450 const struct iphdr *iph; 1451 unsigned int len; 1452 unsigned int offset = skb_network_offset(skb) + sizeof(*iph); 1453 1454 if (!pskb_may_pull(skb, offset)) 1455 return -EINVAL; 1456 1457 iph = ip_hdr(skb); 1458 1459 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) 1460 return -EINVAL; 1461 1462 offset += ip_hdrlen(skb) - sizeof(*iph); 1463 1464 if (!pskb_may_pull(skb, offset)) 1465 return -EINVAL; 1466 1467 iph = ip_hdr(skb); 1468 1469 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1470 return -EINVAL; 1471 1472 len = skb_network_offset(skb) + ntohs(iph->tot_len); 1473 if (skb->len < len || len < offset) 1474 return -EINVAL; 1475 1476 skb_set_transport_header(skb, offset); 1477 1478 return 0; 1479 } 1480 1481 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) 1482 { 1483 unsigned int len = skb_transport_offset(skb); 1484 1485 len += sizeof(struct igmpv3_report); 1486 1487 return pskb_may_pull(skb, len) ? 0 : -EINVAL; 1488 } 1489 1490 static int ip_mc_check_igmp_query(struct sk_buff *skb) 1491 { 1492 unsigned int len = skb_transport_offset(skb); 1493 1494 len += sizeof(struct igmphdr); 1495 if (skb->len < len) 1496 return -EINVAL; 1497 1498 /* IGMPv{1,2}? */ 1499 if (skb->len != len) { 1500 /* or IGMPv3? */ 1501 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); 1502 if (skb->len < len || !pskb_may_pull(skb, len)) 1503 return -EINVAL; 1504 } 1505 1506 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1507 * all-systems destination addresses (224.0.0.1) for general queries 1508 */ 1509 if (!igmp_hdr(skb)->group && 1510 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) 1511 return -EINVAL; 1512 1513 return 0; 1514 } 1515 1516 static int ip_mc_check_igmp_msg(struct sk_buff *skb) 1517 { 1518 switch (igmp_hdr(skb)->type) { 1519 case IGMP_HOST_LEAVE_MESSAGE: 1520 case IGMP_HOST_MEMBERSHIP_REPORT: 1521 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1522 /* fall through */ 1523 return 0; 1524 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1525 return ip_mc_check_igmp_reportv3(skb); 1526 case IGMP_HOST_MEMBERSHIP_QUERY: 1527 return ip_mc_check_igmp_query(skb); 1528 default: 1529 return -ENOMSG; 1530 } 1531 } 1532 1533 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) 1534 { 1535 return skb_checksum_simple_validate(skb); 1536 } 1537 1538 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1539 1540 { 1541 struct sk_buff *skb_chk; 1542 unsigned int transport_len; 1543 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); 1544 int ret = -EINVAL; 1545 1546 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 1547 1548 skb_chk = skb_checksum_trimmed(skb, transport_len, 1549 ip_mc_validate_checksum); 1550 if (!skb_chk) 1551 goto err; 1552 1553 if (!pskb_may_pull(skb_chk, len)) 1554 goto err; 1555 1556 ret = ip_mc_check_igmp_msg(skb_chk); 1557 if (ret) 1558 goto err; 1559 1560 if (skb_trimmed) 1561 *skb_trimmed = skb_chk; 1562 /* free now unneeded clone */ 1563 else if (skb_chk != skb) 1564 kfree_skb(skb_chk); 1565 1566 ret = 0; 1567 1568 err: 1569 if (ret && skb_chk && skb_chk != skb) 1570 kfree_skb(skb_chk); 1571 1572 return ret; 1573 } 1574 1575 /** 1576 * ip_mc_check_igmp - checks whether this is a sane IGMP packet 1577 * @skb: the skb to validate 1578 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) 1579 * 1580 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets 1581 * skb transport header accordingly and returns zero. 1582 * 1583 * -EINVAL: A broken packet was detected, i.e. it violates some internet 1584 * standard 1585 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. 1586 * -ENOMEM: A memory allocation failure happened. 1587 * 1588 * Optionally, an skb pointer might be provided via skb_trimmed (or set it 1589 * to NULL): After parsing an IGMP packet successfully it will point to 1590 * an skb which has its tail aligned to the IP packet end. This might 1591 * either be the originally provided skb or a trimmed, cloned version if 1592 * the skb frame had data beyond the IP packet. A cloned skb allows us 1593 * to leave the original skb and its full frame unchanged (which might be 1594 * desirable for layer 2 frame jugglers). 1595 * 1596 * Caller needs to set the skb network header and free any returned skb if it 1597 * differs from the provided skb. 1598 */ 1599 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1600 { 1601 int ret = ip_mc_check_iphdr(skb); 1602 1603 if (ret < 0) 1604 return ret; 1605 1606 if (ip_hdr(skb)->protocol != IPPROTO_IGMP) 1607 return -ENOMSG; 1608 1609 return __ip_mc_check_igmp(skb, skb_trimmed); 1610 } 1611 EXPORT_SYMBOL(ip_mc_check_igmp); 1612 1613 /* 1614 * Resend IGMP JOIN report; used by netdev notifier. 1615 */ 1616 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1617 { 1618 #ifdef CONFIG_IP_MULTICAST 1619 struct ip_mc_list *im; 1620 int type; 1621 struct net *net = dev_net(in_dev->dev); 1622 1623 ASSERT_RTNL(); 1624 1625 for_each_pmc_rtnl(in_dev, im) { 1626 if (im->multiaddr == IGMP_ALL_HOSTS) 1627 continue; 1628 if (ipv4_is_local_multicast(im->multiaddr) && 1629 !net->ipv4.sysctl_igmp_llm_reports) 1630 continue; 1631 1632 /* a failover is happening and switches 1633 * must be notified immediately 1634 */ 1635 if (IGMP_V1_SEEN(in_dev)) 1636 type = IGMP_HOST_MEMBERSHIP_REPORT; 1637 else if (IGMP_V2_SEEN(in_dev)) 1638 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1639 else 1640 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1641 igmp_send_report(in_dev, im, type); 1642 } 1643 #endif 1644 } 1645 1646 /* 1647 * A socket has left a multicast group on device dev 1648 */ 1649 1650 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1651 { 1652 struct ip_mc_list *i; 1653 struct ip_mc_list __rcu **ip; 1654 1655 ASSERT_RTNL(); 1656 1657 for (ip = &in_dev->mc_list; 1658 (i = rtnl_dereference(*ip)) != NULL; 1659 ip = &i->next_rcu) { 1660 if (i->multiaddr == addr) { 1661 if (--i->users == 0) { 1662 ip_mc_hash_remove(in_dev, i); 1663 *ip = i->next_rcu; 1664 in_dev->mc_count--; 1665 igmp_group_dropped(i); 1666 ip_mc_clear_src(i); 1667 1668 if (!in_dev->dead) 1669 ip_rt_multicast_event(in_dev); 1670 1671 ip_ma_put(i); 1672 return; 1673 } 1674 break; 1675 } 1676 } 1677 } 1678 EXPORT_SYMBOL(ip_mc_dec_group); 1679 1680 /* Device changing type */ 1681 1682 void ip_mc_unmap(struct in_device *in_dev) 1683 { 1684 struct ip_mc_list *pmc; 1685 1686 ASSERT_RTNL(); 1687 1688 for_each_pmc_rtnl(in_dev, pmc) 1689 igmp_group_dropped(pmc); 1690 } 1691 1692 void ip_mc_remap(struct in_device *in_dev) 1693 { 1694 struct ip_mc_list *pmc; 1695 1696 ASSERT_RTNL(); 1697 1698 for_each_pmc_rtnl(in_dev, pmc) { 1699 #ifdef CONFIG_IP_MULTICAST 1700 igmpv3_del_delrec(in_dev, pmc); 1701 #endif 1702 igmp_group_added(pmc); 1703 } 1704 } 1705 1706 /* Device going down */ 1707 1708 void ip_mc_down(struct in_device *in_dev) 1709 { 1710 struct ip_mc_list *pmc; 1711 1712 ASSERT_RTNL(); 1713 1714 for_each_pmc_rtnl(in_dev, pmc) 1715 igmp_group_dropped(pmc); 1716 1717 #ifdef CONFIG_IP_MULTICAST 1718 in_dev->mr_ifc_count = 0; 1719 if (del_timer(&in_dev->mr_ifc_timer)) 1720 __in_dev_put(in_dev); 1721 in_dev->mr_gq_running = 0; 1722 if (del_timer(&in_dev->mr_gq_timer)) 1723 __in_dev_put(in_dev); 1724 #endif 1725 1726 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1727 } 1728 1729 void ip_mc_init_dev(struct in_device *in_dev) 1730 { 1731 #ifdef CONFIG_IP_MULTICAST 1732 struct net *net = dev_net(in_dev->dev); 1733 #endif 1734 ASSERT_RTNL(); 1735 1736 #ifdef CONFIG_IP_MULTICAST 1737 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); 1738 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); 1739 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1740 #endif 1741 1742 spin_lock_init(&in_dev->mc_tomb_lock); 1743 } 1744 1745 /* Device going up */ 1746 1747 void ip_mc_up(struct in_device *in_dev) 1748 { 1749 struct ip_mc_list *pmc; 1750 #ifdef CONFIG_IP_MULTICAST 1751 struct net *net = dev_net(in_dev->dev); 1752 #endif 1753 1754 ASSERT_RTNL(); 1755 1756 #ifdef CONFIG_IP_MULTICAST 1757 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1758 #endif 1759 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1760 1761 for_each_pmc_rtnl(in_dev, pmc) { 1762 #ifdef CONFIG_IP_MULTICAST 1763 igmpv3_del_delrec(in_dev, pmc); 1764 #endif 1765 igmp_group_added(pmc); 1766 } 1767 } 1768 1769 /* 1770 * Device is about to be destroyed: clean up. 1771 */ 1772 1773 void ip_mc_destroy_dev(struct in_device *in_dev) 1774 { 1775 struct ip_mc_list *i; 1776 1777 ASSERT_RTNL(); 1778 1779 /* Deactivate timers */ 1780 ip_mc_down(in_dev); 1781 #ifdef CONFIG_IP_MULTICAST 1782 igmpv3_clear_delrec(in_dev); 1783 #endif 1784 1785 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1786 in_dev->mc_list = i->next_rcu; 1787 in_dev->mc_count--; 1788 ip_ma_put(i); 1789 } 1790 } 1791 1792 /* RTNL is locked */ 1793 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1794 { 1795 struct net_device *dev = NULL; 1796 struct in_device *idev = NULL; 1797 1798 if (imr->imr_ifindex) { 1799 idev = inetdev_by_index(net, imr->imr_ifindex); 1800 return idev; 1801 } 1802 if (imr->imr_address.s_addr) { 1803 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1804 if (!dev) 1805 return NULL; 1806 } 1807 1808 if (!dev) { 1809 struct rtable *rt = ip_route_output(net, 1810 imr->imr_multiaddr.s_addr, 1811 0, 0, 0); 1812 if (!IS_ERR(rt)) { 1813 dev = rt->dst.dev; 1814 ip_rt_put(rt); 1815 } 1816 } 1817 if (dev) { 1818 imr->imr_ifindex = dev->ifindex; 1819 idev = __in_dev_get_rtnl(dev); 1820 } 1821 return idev; 1822 } 1823 1824 /* 1825 * Join a socket to a group 1826 */ 1827 1828 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1829 __be32 *psfsrc) 1830 { 1831 struct ip_sf_list *psf, *psf_prev; 1832 int rv = 0; 1833 1834 psf_prev = NULL; 1835 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1836 if (psf->sf_inaddr == *psfsrc) 1837 break; 1838 psf_prev = psf; 1839 } 1840 if (!psf || psf->sf_count[sfmode] == 0) { 1841 /* source filter not found, or count wrong => bug */ 1842 return -ESRCH; 1843 } 1844 psf->sf_count[sfmode]--; 1845 if (psf->sf_count[sfmode] == 0) { 1846 ip_rt_multicast_event(pmc->interface); 1847 } 1848 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1849 #ifdef CONFIG_IP_MULTICAST 1850 struct in_device *in_dev = pmc->interface; 1851 struct net *net = dev_net(in_dev->dev); 1852 #endif 1853 1854 /* no more filters for this source */ 1855 if (psf_prev) 1856 psf_prev->sf_next = psf->sf_next; 1857 else 1858 pmc->sources = psf->sf_next; 1859 #ifdef CONFIG_IP_MULTICAST 1860 if (psf->sf_oldin && 1861 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1862 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1863 psf->sf_next = pmc->tomb; 1864 pmc->tomb = psf; 1865 rv = 1; 1866 } else 1867 #endif 1868 kfree(psf); 1869 } 1870 return rv; 1871 } 1872 1873 #ifndef CONFIG_IP_MULTICAST 1874 #define igmp_ifc_event(x) do { } while (0) 1875 #endif 1876 1877 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1878 int sfcount, __be32 *psfsrc, int delta) 1879 { 1880 struct ip_mc_list *pmc; 1881 int changerec = 0; 1882 int i, err; 1883 1884 if (!in_dev) 1885 return -ENODEV; 1886 rcu_read_lock(); 1887 for_each_pmc_rcu(in_dev, pmc) { 1888 if (*pmca == pmc->multiaddr) 1889 break; 1890 } 1891 if (!pmc) { 1892 /* MCA not found?? bug */ 1893 rcu_read_unlock(); 1894 return -ESRCH; 1895 } 1896 spin_lock_bh(&pmc->lock); 1897 rcu_read_unlock(); 1898 #ifdef CONFIG_IP_MULTICAST 1899 sf_markstate(pmc); 1900 #endif 1901 if (!delta) { 1902 err = -EINVAL; 1903 if (!pmc->sfcount[sfmode]) 1904 goto out_unlock; 1905 pmc->sfcount[sfmode]--; 1906 } 1907 err = 0; 1908 for (i = 0; i < sfcount; i++) { 1909 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1910 1911 changerec |= rv > 0; 1912 if (!err && rv < 0) 1913 err = rv; 1914 } 1915 if (pmc->sfmode == MCAST_EXCLUDE && 1916 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1917 pmc->sfcount[MCAST_INCLUDE]) { 1918 #ifdef CONFIG_IP_MULTICAST 1919 struct ip_sf_list *psf; 1920 struct net *net = dev_net(in_dev->dev); 1921 #endif 1922 1923 /* filter mode change */ 1924 pmc->sfmode = MCAST_INCLUDE; 1925 #ifdef CONFIG_IP_MULTICAST 1926 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1927 in_dev->mr_ifc_count = pmc->crcount; 1928 for (psf = pmc->sources; psf; psf = psf->sf_next) 1929 psf->sf_crcount = 0; 1930 igmp_ifc_event(pmc->interface); 1931 } else if (sf_setstate(pmc) || changerec) { 1932 igmp_ifc_event(pmc->interface); 1933 #endif 1934 } 1935 out_unlock: 1936 spin_unlock_bh(&pmc->lock); 1937 return err; 1938 } 1939 1940 /* 1941 * Add multicast single-source filter to the interface list 1942 */ 1943 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1944 __be32 *psfsrc) 1945 { 1946 struct ip_sf_list *psf, *psf_prev; 1947 1948 psf_prev = NULL; 1949 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1950 if (psf->sf_inaddr == *psfsrc) 1951 break; 1952 psf_prev = psf; 1953 } 1954 if (!psf) { 1955 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1956 if (!psf) 1957 return -ENOBUFS; 1958 psf->sf_inaddr = *psfsrc; 1959 if (psf_prev) { 1960 psf_prev->sf_next = psf; 1961 } else 1962 pmc->sources = psf; 1963 } 1964 psf->sf_count[sfmode]++; 1965 if (psf->sf_count[sfmode] == 1) { 1966 ip_rt_multicast_event(pmc->interface); 1967 } 1968 return 0; 1969 } 1970 1971 #ifdef CONFIG_IP_MULTICAST 1972 static void sf_markstate(struct ip_mc_list *pmc) 1973 { 1974 struct ip_sf_list *psf; 1975 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1976 1977 for (psf = pmc->sources; psf; psf = psf->sf_next) 1978 if (pmc->sfcount[MCAST_EXCLUDE]) { 1979 psf->sf_oldin = mca_xcount == 1980 psf->sf_count[MCAST_EXCLUDE] && 1981 !psf->sf_count[MCAST_INCLUDE]; 1982 } else 1983 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1984 } 1985 1986 static int sf_setstate(struct ip_mc_list *pmc) 1987 { 1988 struct ip_sf_list *psf, *dpsf; 1989 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1990 int qrv = pmc->interface->mr_qrv; 1991 int new_in, rv; 1992 1993 rv = 0; 1994 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1995 if (pmc->sfcount[MCAST_EXCLUDE]) { 1996 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1997 !psf->sf_count[MCAST_INCLUDE]; 1998 } else 1999 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2000 if (new_in) { 2001 if (!psf->sf_oldin) { 2002 struct ip_sf_list *prev = NULL; 2003 2004 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 2005 if (dpsf->sf_inaddr == psf->sf_inaddr) 2006 break; 2007 prev = dpsf; 2008 } 2009 if (dpsf) { 2010 if (prev) 2011 prev->sf_next = dpsf->sf_next; 2012 else 2013 pmc->tomb = dpsf->sf_next; 2014 kfree(dpsf); 2015 } 2016 psf->sf_crcount = qrv; 2017 rv++; 2018 } 2019 } else if (psf->sf_oldin) { 2020 2021 psf->sf_crcount = 0; 2022 /* 2023 * add or update "delete" records if an active filter 2024 * is now inactive 2025 */ 2026 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 2027 if (dpsf->sf_inaddr == psf->sf_inaddr) 2028 break; 2029 if (!dpsf) { 2030 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2031 if (!dpsf) 2032 continue; 2033 *dpsf = *psf; 2034 /* pmc->lock held by callers */ 2035 dpsf->sf_next = pmc->tomb; 2036 pmc->tomb = dpsf; 2037 } 2038 dpsf->sf_crcount = qrv; 2039 rv++; 2040 } 2041 } 2042 return rv; 2043 } 2044 #endif 2045 2046 /* 2047 * Add multicast source filter list to the interface list 2048 */ 2049 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 2050 int sfcount, __be32 *psfsrc, int delta) 2051 { 2052 struct ip_mc_list *pmc; 2053 int isexclude; 2054 int i, err; 2055 2056 if (!in_dev) 2057 return -ENODEV; 2058 rcu_read_lock(); 2059 for_each_pmc_rcu(in_dev, pmc) { 2060 if (*pmca == pmc->multiaddr) 2061 break; 2062 } 2063 if (!pmc) { 2064 /* MCA not found?? bug */ 2065 rcu_read_unlock(); 2066 return -ESRCH; 2067 } 2068 spin_lock_bh(&pmc->lock); 2069 rcu_read_unlock(); 2070 2071 #ifdef CONFIG_IP_MULTICAST 2072 sf_markstate(pmc); 2073 #endif 2074 isexclude = pmc->sfmode == MCAST_EXCLUDE; 2075 if (!delta) 2076 pmc->sfcount[sfmode]++; 2077 err = 0; 2078 for (i = 0; i < sfcount; i++) { 2079 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2080 if (err) 2081 break; 2082 } 2083 if (err) { 2084 int j; 2085 2086 if (!delta) 2087 pmc->sfcount[sfmode]--; 2088 for (j = 0; j < i; j++) 2089 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2090 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 2091 #ifdef CONFIG_IP_MULTICAST 2092 struct ip_sf_list *psf; 2093 struct net *net = dev_net(pmc->interface->dev); 2094 in_dev = pmc->interface; 2095 #endif 2096 2097 /* filter mode change */ 2098 if (pmc->sfcount[MCAST_EXCLUDE]) 2099 pmc->sfmode = MCAST_EXCLUDE; 2100 else if (pmc->sfcount[MCAST_INCLUDE]) 2101 pmc->sfmode = MCAST_INCLUDE; 2102 #ifdef CONFIG_IP_MULTICAST 2103 /* else no filters; keep old mode for reports */ 2104 2105 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 2106 in_dev->mr_ifc_count = pmc->crcount; 2107 for (psf = pmc->sources; psf; psf = psf->sf_next) 2108 psf->sf_crcount = 0; 2109 igmp_ifc_event(in_dev); 2110 } else if (sf_setstate(pmc)) { 2111 igmp_ifc_event(in_dev); 2112 #endif 2113 } 2114 spin_unlock_bh(&pmc->lock); 2115 return err; 2116 } 2117 2118 static void ip_mc_clear_src(struct ip_mc_list *pmc) 2119 { 2120 struct ip_sf_list *psf, *nextpsf, *tomb, *sources; 2121 2122 spin_lock_bh(&pmc->lock); 2123 tomb = pmc->tomb; 2124 pmc->tomb = NULL; 2125 sources = pmc->sources; 2126 pmc->sources = NULL; 2127 pmc->sfmode = MCAST_EXCLUDE; 2128 pmc->sfcount[MCAST_INCLUDE] = 0; 2129 pmc->sfcount[MCAST_EXCLUDE] = 1; 2130 spin_unlock_bh(&pmc->lock); 2131 2132 for (psf = tomb; psf; psf = nextpsf) { 2133 nextpsf = psf->sf_next; 2134 kfree(psf); 2135 } 2136 for (psf = sources; psf; psf = nextpsf) { 2137 nextpsf = psf->sf_next; 2138 kfree(psf); 2139 } 2140 } 2141 2142 /* Join a multicast group 2143 */ 2144 static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, 2145 unsigned int mode) 2146 { 2147 __be32 addr = imr->imr_multiaddr.s_addr; 2148 struct ip_mc_socklist *iml, *i; 2149 struct in_device *in_dev; 2150 struct inet_sock *inet = inet_sk(sk); 2151 struct net *net = sock_net(sk); 2152 int ifindex; 2153 int count = 0; 2154 int err; 2155 2156 ASSERT_RTNL(); 2157 2158 if (!ipv4_is_multicast(addr)) 2159 return -EINVAL; 2160 2161 in_dev = ip_mc_find_dev(net, imr); 2162 2163 if (!in_dev) { 2164 err = -ENODEV; 2165 goto done; 2166 } 2167 2168 err = -EADDRINUSE; 2169 ifindex = imr->imr_ifindex; 2170 for_each_pmc_rtnl(inet, i) { 2171 if (i->multi.imr_multiaddr.s_addr == addr && 2172 i->multi.imr_ifindex == ifindex) 2173 goto done; 2174 count++; 2175 } 2176 err = -ENOBUFS; 2177 if (count >= net->ipv4.sysctl_igmp_max_memberships) 2178 goto done; 2179 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 2180 if (!iml) 2181 goto done; 2182 2183 memcpy(&iml->multi, imr, sizeof(*imr)); 2184 iml->next_rcu = inet->mc_list; 2185 iml->sflist = NULL; 2186 iml->sfmode = mode; 2187 rcu_assign_pointer(inet->mc_list, iml); 2188 __ip_mc_inc_group(in_dev, addr, mode); 2189 err = 0; 2190 done: 2191 return err; 2192 } 2193 2194 /* Join ASM (Any-Source Multicast) group 2195 */ 2196 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) 2197 { 2198 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); 2199 } 2200 EXPORT_SYMBOL(ip_mc_join_group); 2201 2202 /* Join SSM (Source-Specific Multicast) group 2203 */ 2204 int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, 2205 unsigned int mode) 2206 { 2207 return __ip_mc_join_group(sk, imr, mode); 2208 } 2209 2210 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 2211 struct in_device *in_dev) 2212 { 2213 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 2214 int err; 2215 2216 if (!psf) { 2217 /* any-source empty exclude case */ 2218 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2219 iml->sfmode, 0, NULL, 0); 2220 } 2221 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2222 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 2223 RCU_INIT_POINTER(iml->sflist, NULL); 2224 /* decrease mem now to avoid the memleak warning */ 2225 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 2226 kfree_rcu(psf, rcu); 2227 return err; 2228 } 2229 2230 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 2231 { 2232 struct inet_sock *inet = inet_sk(sk); 2233 struct ip_mc_socklist *iml; 2234 struct ip_mc_socklist __rcu **imlp; 2235 struct in_device *in_dev; 2236 struct net *net = sock_net(sk); 2237 __be32 group = imr->imr_multiaddr.s_addr; 2238 u32 ifindex; 2239 int ret = -EADDRNOTAVAIL; 2240 2241 ASSERT_RTNL(); 2242 2243 in_dev = ip_mc_find_dev(net, imr); 2244 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { 2245 ret = -ENODEV; 2246 goto out; 2247 } 2248 ifindex = imr->imr_ifindex; 2249 for (imlp = &inet->mc_list; 2250 (iml = rtnl_dereference(*imlp)) != NULL; 2251 imlp = &iml->next_rcu) { 2252 if (iml->multi.imr_multiaddr.s_addr != group) 2253 continue; 2254 if (ifindex) { 2255 if (iml->multi.imr_ifindex != ifindex) 2256 continue; 2257 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 2258 iml->multi.imr_address.s_addr) 2259 continue; 2260 2261 (void) ip_mc_leave_src(sk, iml, in_dev); 2262 2263 *imlp = iml->next_rcu; 2264 2265 if (in_dev) 2266 ip_mc_dec_group(in_dev, group); 2267 2268 /* decrease mem now to avoid the memleak warning */ 2269 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2270 kfree_rcu(iml, rcu); 2271 return 0; 2272 } 2273 out: 2274 return ret; 2275 } 2276 EXPORT_SYMBOL(ip_mc_leave_group); 2277 2278 int ip_mc_source(int add, int omode, struct sock *sk, struct 2279 ip_mreq_source *mreqs, int ifindex) 2280 { 2281 int err; 2282 struct ip_mreqn imr; 2283 __be32 addr = mreqs->imr_multiaddr; 2284 struct ip_mc_socklist *pmc; 2285 struct in_device *in_dev = NULL; 2286 struct inet_sock *inet = inet_sk(sk); 2287 struct ip_sf_socklist *psl; 2288 struct net *net = sock_net(sk); 2289 int leavegroup = 0; 2290 int i, j, rv; 2291 2292 if (!ipv4_is_multicast(addr)) 2293 return -EINVAL; 2294 2295 ASSERT_RTNL(); 2296 2297 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2298 imr.imr_address.s_addr = mreqs->imr_interface; 2299 imr.imr_ifindex = ifindex; 2300 in_dev = ip_mc_find_dev(net, &imr); 2301 2302 if (!in_dev) { 2303 err = -ENODEV; 2304 goto done; 2305 } 2306 err = -EADDRNOTAVAIL; 2307 2308 for_each_pmc_rtnl(inet, pmc) { 2309 if ((pmc->multi.imr_multiaddr.s_addr == 2310 imr.imr_multiaddr.s_addr) && 2311 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2312 break; 2313 } 2314 if (!pmc) { /* must have a prior join */ 2315 err = -EINVAL; 2316 goto done; 2317 } 2318 /* if a source filter was set, must be the same mode as before */ 2319 if (pmc->sflist) { 2320 if (pmc->sfmode != omode) { 2321 err = -EINVAL; 2322 goto done; 2323 } 2324 } else if (pmc->sfmode != omode) { 2325 /* allow mode switches for empty-set filters */ 2326 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2327 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2328 NULL, 0); 2329 pmc->sfmode = omode; 2330 } 2331 2332 psl = rtnl_dereference(pmc->sflist); 2333 if (!add) { 2334 if (!psl) 2335 goto done; /* err = -EADDRNOTAVAIL */ 2336 rv = !0; 2337 for (i = 0; i < psl->sl_count; i++) { 2338 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2339 sizeof(__be32)); 2340 if (rv == 0) 2341 break; 2342 } 2343 if (rv) /* source not found */ 2344 goto done; /* err = -EADDRNOTAVAIL */ 2345 2346 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2347 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2348 leavegroup = 1; 2349 goto done; 2350 } 2351 2352 /* update the interface filter */ 2353 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2354 &mreqs->imr_sourceaddr, 1); 2355 2356 for (j = i+1; j < psl->sl_count; j++) 2357 psl->sl_addr[j-1] = psl->sl_addr[j]; 2358 psl->sl_count--; 2359 err = 0; 2360 goto done; 2361 } 2362 /* else, add a new source to the filter */ 2363 2364 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { 2365 err = -ENOBUFS; 2366 goto done; 2367 } 2368 if (!psl || psl->sl_count == psl->sl_max) { 2369 struct ip_sf_socklist *newpsl; 2370 int count = IP_SFBLOCK; 2371 2372 if (psl) 2373 count += psl->sl_max; 2374 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2375 if (!newpsl) { 2376 err = -ENOBUFS; 2377 goto done; 2378 } 2379 newpsl->sl_max = count; 2380 newpsl->sl_count = count - IP_SFBLOCK; 2381 if (psl) { 2382 for (i = 0; i < psl->sl_count; i++) 2383 newpsl->sl_addr[i] = psl->sl_addr[i]; 2384 /* decrease mem now to avoid the memleak warning */ 2385 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2386 kfree_rcu(psl, rcu); 2387 } 2388 rcu_assign_pointer(pmc->sflist, newpsl); 2389 psl = newpsl; 2390 } 2391 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2392 for (i = 0; i < psl->sl_count; i++) { 2393 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2394 sizeof(__be32)); 2395 if (rv == 0) 2396 break; 2397 } 2398 if (rv == 0) /* address already there is an error */ 2399 goto done; 2400 for (j = psl->sl_count-1; j >= i; j--) 2401 psl->sl_addr[j+1] = psl->sl_addr[j]; 2402 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2403 psl->sl_count++; 2404 err = 0; 2405 /* update the interface list */ 2406 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2407 &mreqs->imr_sourceaddr, 1); 2408 done: 2409 if (leavegroup) 2410 err = ip_mc_leave_group(sk, &imr); 2411 return err; 2412 } 2413 2414 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2415 { 2416 int err = 0; 2417 struct ip_mreqn imr; 2418 __be32 addr = msf->imsf_multiaddr; 2419 struct ip_mc_socklist *pmc; 2420 struct in_device *in_dev; 2421 struct inet_sock *inet = inet_sk(sk); 2422 struct ip_sf_socklist *newpsl, *psl; 2423 struct net *net = sock_net(sk); 2424 int leavegroup = 0; 2425 2426 if (!ipv4_is_multicast(addr)) 2427 return -EINVAL; 2428 if (msf->imsf_fmode != MCAST_INCLUDE && 2429 msf->imsf_fmode != MCAST_EXCLUDE) 2430 return -EINVAL; 2431 2432 ASSERT_RTNL(); 2433 2434 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2435 imr.imr_address.s_addr = msf->imsf_interface; 2436 imr.imr_ifindex = ifindex; 2437 in_dev = ip_mc_find_dev(net, &imr); 2438 2439 if (!in_dev) { 2440 err = -ENODEV; 2441 goto done; 2442 } 2443 2444 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2445 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2446 leavegroup = 1; 2447 goto done; 2448 } 2449 2450 for_each_pmc_rtnl(inet, pmc) { 2451 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2452 pmc->multi.imr_ifindex == imr.imr_ifindex) 2453 break; 2454 } 2455 if (!pmc) { /* must have a prior join */ 2456 err = -EINVAL; 2457 goto done; 2458 } 2459 if (msf->imsf_numsrc) { 2460 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2461 GFP_KERNEL); 2462 if (!newpsl) { 2463 err = -ENOBUFS; 2464 goto done; 2465 } 2466 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2467 memcpy(newpsl->sl_addr, msf->imsf_slist, 2468 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2469 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2470 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2471 if (err) { 2472 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2473 goto done; 2474 } 2475 } else { 2476 newpsl = NULL; 2477 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2478 msf->imsf_fmode, 0, NULL, 0); 2479 } 2480 psl = rtnl_dereference(pmc->sflist); 2481 if (psl) { 2482 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2483 psl->sl_count, psl->sl_addr, 0); 2484 /* decrease mem now to avoid the memleak warning */ 2485 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2486 kfree_rcu(psl, rcu); 2487 } else 2488 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2489 0, NULL, 0); 2490 rcu_assign_pointer(pmc->sflist, newpsl); 2491 pmc->sfmode = msf->imsf_fmode; 2492 err = 0; 2493 done: 2494 if (leavegroup) 2495 err = ip_mc_leave_group(sk, &imr); 2496 return err; 2497 } 2498 2499 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2500 struct ip_msfilter __user *optval, int __user *optlen) 2501 { 2502 int err, len, count, copycount; 2503 struct ip_mreqn imr; 2504 __be32 addr = msf->imsf_multiaddr; 2505 struct ip_mc_socklist *pmc; 2506 struct in_device *in_dev; 2507 struct inet_sock *inet = inet_sk(sk); 2508 struct ip_sf_socklist *psl; 2509 struct net *net = sock_net(sk); 2510 2511 ASSERT_RTNL(); 2512 2513 if (!ipv4_is_multicast(addr)) 2514 return -EINVAL; 2515 2516 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2517 imr.imr_address.s_addr = msf->imsf_interface; 2518 imr.imr_ifindex = 0; 2519 in_dev = ip_mc_find_dev(net, &imr); 2520 2521 if (!in_dev) { 2522 err = -ENODEV; 2523 goto done; 2524 } 2525 err = -EADDRNOTAVAIL; 2526 2527 for_each_pmc_rtnl(inet, pmc) { 2528 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2529 pmc->multi.imr_ifindex == imr.imr_ifindex) 2530 break; 2531 } 2532 if (!pmc) /* must have a prior join */ 2533 goto done; 2534 msf->imsf_fmode = pmc->sfmode; 2535 psl = rtnl_dereference(pmc->sflist); 2536 if (!psl) { 2537 len = 0; 2538 count = 0; 2539 } else { 2540 count = psl->sl_count; 2541 } 2542 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2543 len = copycount * sizeof(psl->sl_addr[0]); 2544 msf->imsf_numsrc = count; 2545 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2546 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2547 return -EFAULT; 2548 } 2549 if (len && 2550 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2551 return -EFAULT; 2552 return 0; 2553 done: 2554 return err; 2555 } 2556 2557 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2558 struct group_filter __user *optval, int __user *optlen) 2559 { 2560 int err, i, count, copycount; 2561 struct sockaddr_in *psin; 2562 __be32 addr; 2563 struct ip_mc_socklist *pmc; 2564 struct inet_sock *inet = inet_sk(sk); 2565 struct ip_sf_socklist *psl; 2566 2567 ASSERT_RTNL(); 2568 2569 psin = (struct sockaddr_in *)&gsf->gf_group; 2570 if (psin->sin_family != AF_INET) 2571 return -EINVAL; 2572 addr = psin->sin_addr.s_addr; 2573 if (!ipv4_is_multicast(addr)) 2574 return -EINVAL; 2575 2576 err = -EADDRNOTAVAIL; 2577 2578 for_each_pmc_rtnl(inet, pmc) { 2579 if (pmc->multi.imr_multiaddr.s_addr == addr && 2580 pmc->multi.imr_ifindex == gsf->gf_interface) 2581 break; 2582 } 2583 if (!pmc) /* must have a prior join */ 2584 goto done; 2585 gsf->gf_fmode = pmc->sfmode; 2586 psl = rtnl_dereference(pmc->sflist); 2587 count = psl ? psl->sl_count : 0; 2588 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2589 gsf->gf_numsrc = count; 2590 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2591 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2592 return -EFAULT; 2593 } 2594 for (i = 0; i < copycount; i++) { 2595 struct sockaddr_storage ss; 2596 2597 psin = (struct sockaddr_in *)&ss; 2598 memset(&ss, 0, sizeof(ss)); 2599 psin->sin_family = AF_INET; 2600 psin->sin_addr.s_addr = psl->sl_addr[i]; 2601 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2602 return -EFAULT; 2603 } 2604 return 0; 2605 done: 2606 return err; 2607 } 2608 2609 /* 2610 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2611 */ 2612 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, 2613 int dif, int sdif) 2614 { 2615 struct inet_sock *inet = inet_sk(sk); 2616 struct ip_mc_socklist *pmc; 2617 struct ip_sf_socklist *psl; 2618 int i; 2619 int ret; 2620 2621 ret = 1; 2622 if (!ipv4_is_multicast(loc_addr)) 2623 goto out; 2624 2625 rcu_read_lock(); 2626 for_each_pmc_rcu(inet, pmc) { 2627 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2628 (pmc->multi.imr_ifindex == dif || 2629 (sdif && pmc->multi.imr_ifindex == sdif))) 2630 break; 2631 } 2632 ret = inet->mc_all; 2633 if (!pmc) 2634 goto unlock; 2635 psl = rcu_dereference(pmc->sflist); 2636 ret = (pmc->sfmode == MCAST_EXCLUDE); 2637 if (!psl) 2638 goto unlock; 2639 2640 for (i = 0; i < psl->sl_count; i++) { 2641 if (psl->sl_addr[i] == rmt_addr) 2642 break; 2643 } 2644 ret = 0; 2645 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2646 goto unlock; 2647 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2648 goto unlock; 2649 ret = 1; 2650 unlock: 2651 rcu_read_unlock(); 2652 out: 2653 return ret; 2654 } 2655 2656 /* 2657 * A socket is closing. 2658 */ 2659 2660 void ip_mc_drop_socket(struct sock *sk) 2661 { 2662 struct inet_sock *inet = inet_sk(sk); 2663 struct ip_mc_socklist *iml; 2664 struct net *net = sock_net(sk); 2665 2666 if (!inet->mc_list) 2667 return; 2668 2669 rtnl_lock(); 2670 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2671 struct in_device *in_dev; 2672 2673 inet->mc_list = iml->next_rcu; 2674 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2675 (void) ip_mc_leave_src(sk, iml, in_dev); 2676 if (in_dev) 2677 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2678 /* decrease mem now to avoid the memleak warning */ 2679 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2680 kfree_rcu(iml, rcu); 2681 } 2682 rtnl_unlock(); 2683 } 2684 2685 /* called with rcu_read_lock() */ 2686 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) 2687 { 2688 struct ip_mc_list *im; 2689 struct ip_mc_list __rcu **mc_hash; 2690 struct ip_sf_list *psf; 2691 int rv = 0; 2692 2693 mc_hash = rcu_dereference(in_dev->mc_hash); 2694 if (mc_hash) { 2695 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2696 2697 for (im = rcu_dereference(mc_hash[hash]); 2698 im != NULL; 2699 im = rcu_dereference(im->next_hash)) { 2700 if (im->multiaddr == mc_addr) 2701 break; 2702 } 2703 } else { 2704 for_each_pmc_rcu(in_dev, im) { 2705 if (im->multiaddr == mc_addr) 2706 break; 2707 } 2708 } 2709 if (im && proto == IPPROTO_IGMP) { 2710 rv = 1; 2711 } else if (im) { 2712 if (src_addr) { 2713 for (psf = im->sources; psf; psf = psf->sf_next) { 2714 if (psf->sf_inaddr == src_addr) 2715 break; 2716 } 2717 if (psf) 2718 rv = psf->sf_count[MCAST_INCLUDE] || 2719 psf->sf_count[MCAST_EXCLUDE] != 2720 im->sfcount[MCAST_EXCLUDE]; 2721 else 2722 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2723 } else 2724 rv = 1; /* unspecified source; tentatively allow */ 2725 } 2726 return rv; 2727 } 2728 2729 #if defined(CONFIG_PROC_FS) 2730 struct igmp_mc_iter_state { 2731 struct seq_net_private p; 2732 struct net_device *dev; 2733 struct in_device *in_dev; 2734 }; 2735 2736 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2737 2738 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2739 { 2740 struct net *net = seq_file_net(seq); 2741 struct ip_mc_list *im = NULL; 2742 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2743 2744 state->in_dev = NULL; 2745 for_each_netdev_rcu(net, state->dev) { 2746 struct in_device *in_dev; 2747 2748 in_dev = __in_dev_get_rcu(state->dev); 2749 if (!in_dev) 2750 continue; 2751 im = rcu_dereference(in_dev->mc_list); 2752 if (im) { 2753 state->in_dev = in_dev; 2754 break; 2755 } 2756 } 2757 return im; 2758 } 2759 2760 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2761 { 2762 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2763 2764 im = rcu_dereference(im->next_rcu); 2765 while (!im) { 2766 state->dev = next_net_device_rcu(state->dev); 2767 if (!state->dev) { 2768 state->in_dev = NULL; 2769 break; 2770 } 2771 state->in_dev = __in_dev_get_rcu(state->dev); 2772 if (!state->in_dev) 2773 continue; 2774 im = rcu_dereference(state->in_dev->mc_list); 2775 } 2776 return im; 2777 } 2778 2779 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2780 { 2781 struct ip_mc_list *im = igmp_mc_get_first(seq); 2782 if (im) 2783 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2784 --pos; 2785 return pos ? NULL : im; 2786 } 2787 2788 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2789 __acquires(rcu) 2790 { 2791 rcu_read_lock(); 2792 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2793 } 2794 2795 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2796 { 2797 struct ip_mc_list *im; 2798 if (v == SEQ_START_TOKEN) 2799 im = igmp_mc_get_first(seq); 2800 else 2801 im = igmp_mc_get_next(seq, v); 2802 ++*pos; 2803 return im; 2804 } 2805 2806 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2807 __releases(rcu) 2808 { 2809 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2810 2811 state->in_dev = NULL; 2812 state->dev = NULL; 2813 rcu_read_unlock(); 2814 } 2815 2816 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2817 { 2818 if (v == SEQ_START_TOKEN) 2819 seq_puts(seq, 2820 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2821 else { 2822 struct ip_mc_list *im = (struct ip_mc_list *)v; 2823 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2824 char *querier; 2825 long delta; 2826 2827 #ifdef CONFIG_IP_MULTICAST 2828 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2829 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2830 "V3"; 2831 #else 2832 querier = "NONE"; 2833 #endif 2834 2835 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2836 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2837 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2838 } 2839 2840 delta = im->timer.expires - jiffies; 2841 seq_printf(seq, 2842 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2843 im->multiaddr, im->users, 2844 im->tm_running, 2845 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2846 im->reporter); 2847 } 2848 return 0; 2849 } 2850 2851 static const struct seq_operations igmp_mc_seq_ops = { 2852 .start = igmp_mc_seq_start, 2853 .next = igmp_mc_seq_next, 2854 .stop = igmp_mc_seq_stop, 2855 .show = igmp_mc_seq_show, 2856 }; 2857 2858 struct igmp_mcf_iter_state { 2859 struct seq_net_private p; 2860 struct net_device *dev; 2861 struct in_device *idev; 2862 struct ip_mc_list *im; 2863 }; 2864 2865 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2866 2867 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2868 { 2869 struct net *net = seq_file_net(seq); 2870 struct ip_sf_list *psf = NULL; 2871 struct ip_mc_list *im = NULL; 2872 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2873 2874 state->idev = NULL; 2875 state->im = NULL; 2876 for_each_netdev_rcu(net, state->dev) { 2877 struct in_device *idev; 2878 idev = __in_dev_get_rcu(state->dev); 2879 if (unlikely(!idev)) 2880 continue; 2881 im = rcu_dereference(idev->mc_list); 2882 if (likely(im)) { 2883 spin_lock_bh(&im->lock); 2884 psf = im->sources; 2885 if (likely(psf)) { 2886 state->im = im; 2887 state->idev = idev; 2888 break; 2889 } 2890 spin_unlock_bh(&im->lock); 2891 } 2892 } 2893 return psf; 2894 } 2895 2896 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2897 { 2898 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2899 2900 psf = psf->sf_next; 2901 while (!psf) { 2902 spin_unlock_bh(&state->im->lock); 2903 state->im = state->im->next; 2904 while (!state->im) { 2905 state->dev = next_net_device_rcu(state->dev); 2906 if (!state->dev) { 2907 state->idev = NULL; 2908 goto out; 2909 } 2910 state->idev = __in_dev_get_rcu(state->dev); 2911 if (!state->idev) 2912 continue; 2913 state->im = rcu_dereference(state->idev->mc_list); 2914 } 2915 if (!state->im) 2916 break; 2917 spin_lock_bh(&state->im->lock); 2918 psf = state->im->sources; 2919 } 2920 out: 2921 return psf; 2922 } 2923 2924 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2925 { 2926 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2927 if (psf) 2928 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2929 --pos; 2930 return pos ? NULL : psf; 2931 } 2932 2933 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2934 __acquires(rcu) 2935 { 2936 rcu_read_lock(); 2937 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2938 } 2939 2940 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2941 { 2942 struct ip_sf_list *psf; 2943 if (v == SEQ_START_TOKEN) 2944 psf = igmp_mcf_get_first(seq); 2945 else 2946 psf = igmp_mcf_get_next(seq, v); 2947 ++*pos; 2948 return psf; 2949 } 2950 2951 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2952 __releases(rcu) 2953 { 2954 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2955 if (likely(state->im)) { 2956 spin_unlock_bh(&state->im->lock); 2957 state->im = NULL; 2958 } 2959 state->idev = NULL; 2960 state->dev = NULL; 2961 rcu_read_unlock(); 2962 } 2963 2964 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2965 { 2966 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2967 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2968 2969 if (v == SEQ_START_TOKEN) { 2970 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2971 } else { 2972 seq_printf(seq, 2973 "%3d %6.6s 0x%08x " 2974 "0x%08x %6lu %6lu\n", 2975 state->dev->ifindex, state->dev->name, 2976 ntohl(state->im->multiaddr), 2977 ntohl(psf->sf_inaddr), 2978 psf->sf_count[MCAST_INCLUDE], 2979 psf->sf_count[MCAST_EXCLUDE]); 2980 } 2981 return 0; 2982 } 2983 2984 static const struct seq_operations igmp_mcf_seq_ops = { 2985 .start = igmp_mcf_seq_start, 2986 .next = igmp_mcf_seq_next, 2987 .stop = igmp_mcf_seq_stop, 2988 .show = igmp_mcf_seq_show, 2989 }; 2990 2991 static int __net_init igmp_net_init(struct net *net) 2992 { 2993 struct proc_dir_entry *pde; 2994 int err; 2995 2996 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, 2997 sizeof(struct igmp_mc_iter_state)); 2998 if (!pde) 2999 goto out_igmp; 3000 pde = proc_create_net("mcfilter", 0444, net->proc_net, 3001 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); 3002 if (!pde) 3003 goto out_mcfilter; 3004 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, 3005 SOCK_DGRAM, 0, net); 3006 if (err < 0) { 3007 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", 3008 err); 3009 goto out_sock; 3010 } 3011 3012 return 0; 3013 3014 out_sock: 3015 remove_proc_entry("mcfilter", net->proc_net); 3016 out_mcfilter: 3017 remove_proc_entry("igmp", net->proc_net); 3018 out_igmp: 3019 return -ENOMEM; 3020 } 3021 3022 static void __net_exit igmp_net_exit(struct net *net) 3023 { 3024 remove_proc_entry("mcfilter", net->proc_net); 3025 remove_proc_entry("igmp", net->proc_net); 3026 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); 3027 } 3028 3029 static struct pernet_operations igmp_net_ops = { 3030 .init = igmp_net_init, 3031 .exit = igmp_net_exit, 3032 }; 3033 #endif 3034 3035 static int igmp_netdev_event(struct notifier_block *this, 3036 unsigned long event, void *ptr) 3037 { 3038 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3039 struct in_device *in_dev; 3040 3041 switch (event) { 3042 case NETDEV_RESEND_IGMP: 3043 in_dev = __in_dev_get_rtnl(dev); 3044 if (in_dev) 3045 ip_mc_rejoin_groups(in_dev); 3046 break; 3047 default: 3048 break; 3049 } 3050 return NOTIFY_DONE; 3051 } 3052 3053 static struct notifier_block igmp_notifier = { 3054 .notifier_call = igmp_netdev_event, 3055 }; 3056 3057 int __init igmp_mc_init(void) 3058 { 3059 #if defined(CONFIG_PROC_FS) 3060 int err; 3061 3062 err = register_pernet_subsys(&igmp_net_ops); 3063 if (err) 3064 return err; 3065 err = register_netdevice_notifier(&igmp_notifier); 3066 if (err) 3067 goto reg_notif_fail; 3068 return 0; 3069 3070 reg_notif_fail: 3071 unregister_pernet_subsys(&igmp_net_ops); 3072 return err; 3073 #else 3074 return register_netdevice_notifier(&igmp_notifier); 3075 #endif 3076 } 3077