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 93 #include <net/net_namespace.h> 94 #include <net/arp.h> 95 #include <net/ip.h> 96 #include <net/protocol.h> 97 #include <net/route.h> 98 #include <net/sock.h> 99 #include <net/checksum.h> 100 #include <net/inet_common.h> 101 #include <linux/netfilter_ipv4.h> 102 #ifdef CONFIG_IP_MROUTE 103 #include <linux/mroute.h> 104 #endif 105 #ifdef CONFIG_PROC_FS 106 #include <linux/proc_fs.h> 107 #include <linux/seq_file.h> 108 #endif 109 110 #ifdef CONFIG_IP_MULTICAST 111 /* Parameter names and values are taken from igmp-v2-06 draft */ 112 113 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) 114 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) 115 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) 116 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) 117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) 118 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 119 120 121 #define IGMP_INITIAL_REPORT_DELAY (1) 122 123 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! 124 * IGMP specs require to report membership immediately after 125 * joining a group, but we delay the first report by a 126 * small interval. It seems more natural and still does not 127 * contradict to specs provided this delay is small enough. 128 */ 129 130 #define IGMP_V1_SEEN(in_dev) \ 131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 133 ((in_dev)->mr_v1_seen && \ 134 time_before(jiffies, (in_dev)->mr_v1_seen))) 135 #define IGMP_V2_SEEN(in_dev) \ 136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 138 ((in_dev)->mr_v2_seen && \ 139 time_before(jiffies, (in_dev)->mr_v2_seen))) 140 141 static int unsolicited_report_interval(struct in_device *in_dev) 142 { 143 int interval_ms, interval_jiffies; 144 145 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 146 interval_ms = IN_DEV_CONF_GET( 147 in_dev, 148 IGMPV2_UNSOLICITED_REPORT_INTERVAL); 149 else /* v3 */ 150 interval_ms = IN_DEV_CONF_GET( 151 in_dev, 152 IGMPV3_UNSOLICITED_REPORT_INTERVAL); 153 154 interval_jiffies = msecs_to_jiffies(interval_ms); 155 156 /* _timer functions can't handle a delay of 0 jiffies so ensure 157 * we always return a positive value. 158 */ 159 if (interval_jiffies <= 0) 160 interval_jiffies = 1; 161 return interval_jiffies; 162 } 163 164 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 165 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); 166 static void igmpv3_clear_delrec(struct in_device *in_dev); 167 static int sf_setstate(struct ip_mc_list *pmc); 168 static void sf_markstate(struct ip_mc_list *pmc); 169 #endif 170 static void ip_mc_clear_src(struct ip_mc_list *pmc); 171 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 172 int sfcount, __be32 *psfsrc, int delta); 173 174 static void ip_ma_put(struct ip_mc_list *im) 175 { 176 if (atomic_dec_and_test(&im->refcnt)) { 177 in_dev_put(im->interface); 178 kfree_rcu(im, rcu); 179 } 180 } 181 182 #define for_each_pmc_rcu(in_dev, pmc) \ 183 for (pmc = rcu_dereference(in_dev->mc_list); \ 184 pmc != NULL; \ 185 pmc = rcu_dereference(pmc->next_rcu)) 186 187 #define for_each_pmc_rtnl(in_dev, pmc) \ 188 for (pmc = rtnl_dereference(in_dev->mc_list); \ 189 pmc != NULL; \ 190 pmc = rtnl_dereference(pmc->next_rcu)) 191 192 #ifdef CONFIG_IP_MULTICAST 193 194 /* 195 * Timer management 196 */ 197 198 static void igmp_stop_timer(struct ip_mc_list *im) 199 { 200 spin_lock_bh(&im->lock); 201 if (del_timer(&im->timer)) 202 atomic_dec(&im->refcnt); 203 im->tm_running = 0; 204 im->reporter = 0; 205 im->unsolicit_count = 0; 206 spin_unlock_bh(&im->lock); 207 } 208 209 /* It must be called with locked im->lock */ 210 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 211 { 212 int tv = prandom_u32() % max_delay; 213 214 im->tm_running = 1; 215 if (!mod_timer(&im->timer, jiffies+tv+2)) 216 atomic_inc(&im->refcnt); 217 } 218 219 static void igmp_gq_start_timer(struct in_device *in_dev) 220 { 221 int tv = prandom_u32() % in_dev->mr_maxdelay; 222 unsigned long exp = jiffies + tv + 2; 223 224 if (in_dev->mr_gq_running && 225 time_after_eq(exp, (in_dev->mr_gq_timer).expires)) 226 return; 227 228 in_dev->mr_gq_running = 1; 229 if (!mod_timer(&in_dev->mr_gq_timer, exp)) 230 in_dev_hold(in_dev); 231 } 232 233 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 234 { 235 int tv = prandom_u32() % delay; 236 237 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 238 in_dev_hold(in_dev); 239 } 240 241 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 242 { 243 spin_lock_bh(&im->lock); 244 im->unsolicit_count = 0; 245 if (del_timer(&im->timer)) { 246 if ((long)(im->timer.expires-jiffies) < max_delay) { 247 add_timer(&im->timer); 248 im->tm_running = 1; 249 spin_unlock_bh(&im->lock); 250 return; 251 } 252 atomic_dec(&im->refcnt); 253 } 254 igmp_start_timer(im, max_delay); 255 spin_unlock_bh(&im->lock); 256 } 257 258 259 /* 260 * Send an IGMP report. 261 */ 262 263 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 264 265 266 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 267 int gdeleted, int sdeleted) 268 { 269 switch (type) { 270 case IGMPV3_MODE_IS_INCLUDE: 271 case IGMPV3_MODE_IS_EXCLUDE: 272 if (gdeleted || sdeleted) 273 return 0; 274 if (!(pmc->gsquery && !psf->sf_gsresp)) { 275 if (pmc->sfmode == MCAST_INCLUDE) 276 return 1; 277 /* don't include if this source is excluded 278 * in all filters 279 */ 280 if (psf->sf_count[MCAST_INCLUDE]) 281 return type == IGMPV3_MODE_IS_INCLUDE; 282 return pmc->sfcount[MCAST_EXCLUDE] == 283 psf->sf_count[MCAST_EXCLUDE]; 284 } 285 return 0; 286 case IGMPV3_CHANGE_TO_INCLUDE: 287 if (gdeleted || sdeleted) 288 return 0; 289 return psf->sf_count[MCAST_INCLUDE] != 0; 290 case IGMPV3_CHANGE_TO_EXCLUDE: 291 if (gdeleted || sdeleted) 292 return 0; 293 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 294 psf->sf_count[MCAST_INCLUDE]) 295 return 0; 296 return pmc->sfcount[MCAST_EXCLUDE] == 297 psf->sf_count[MCAST_EXCLUDE]; 298 case IGMPV3_ALLOW_NEW_SOURCES: 299 if (gdeleted || !psf->sf_crcount) 300 return 0; 301 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 302 case IGMPV3_BLOCK_OLD_SOURCES: 303 if (pmc->sfmode == MCAST_INCLUDE) 304 return gdeleted || (psf->sf_crcount && sdeleted); 305 return psf->sf_crcount && !gdeleted && !sdeleted; 306 } 307 return 0; 308 } 309 310 static int 311 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 312 { 313 struct ip_sf_list *psf; 314 int scount = 0; 315 316 for (psf = pmc->sources; psf; psf = psf->sf_next) { 317 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 318 continue; 319 scount++; 320 } 321 return scount; 322 } 323 324 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) 325 { 326 struct sk_buff *skb; 327 struct rtable *rt; 328 struct iphdr *pip; 329 struct igmpv3_report *pig; 330 struct net *net = dev_net(dev); 331 struct flowi4 fl4; 332 int hlen = LL_RESERVED_SPACE(dev); 333 int tlen = dev->needed_tailroom; 334 unsigned int size = mtu; 335 336 while (1) { 337 skb = alloc_skb(size + hlen + tlen, 338 GFP_ATOMIC | __GFP_NOWARN); 339 if (skb) 340 break; 341 size >>= 1; 342 if (size < 256) 343 return NULL; 344 } 345 skb->priority = TC_PRIO_CONTROL; 346 347 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 348 0, 0, 349 IPPROTO_IGMP, 0, dev->ifindex); 350 if (IS_ERR(rt)) { 351 kfree_skb(skb); 352 return NULL; 353 } 354 355 skb_dst_set(skb, &rt->dst); 356 skb->dev = dev; 357 358 skb_reserve(skb, hlen); 359 skb_tailroom_reserve(skb, mtu, tlen); 360 361 skb_reset_network_header(skb); 362 pip = ip_hdr(skb); 363 skb_put(skb, sizeof(struct iphdr) + 4); 364 365 pip->version = 4; 366 pip->ihl = (sizeof(struct iphdr)+4)>>2; 367 pip->tos = 0xc0; 368 pip->frag_off = htons(IP_DF); 369 pip->ttl = 1; 370 pip->daddr = fl4.daddr; 371 pip->saddr = fl4.saddr; 372 pip->protocol = IPPROTO_IGMP; 373 pip->tot_len = 0; /* filled in later */ 374 ip_select_ident(net, skb, NULL); 375 ((u8 *)&pip[1])[0] = IPOPT_RA; 376 ((u8 *)&pip[1])[1] = 4; 377 ((u8 *)&pip[1])[2] = 0; 378 ((u8 *)&pip[1])[3] = 0; 379 380 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 381 skb_put(skb, sizeof(*pig)); 382 pig = igmpv3_report_hdr(skb); 383 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 384 pig->resv1 = 0; 385 pig->csum = 0; 386 pig->resv2 = 0; 387 pig->ngrec = 0; 388 return skb; 389 } 390 391 static int igmpv3_sendpack(struct sk_buff *skb) 392 { 393 struct igmphdr *pig = igmp_hdr(skb); 394 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); 395 396 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 397 398 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 399 } 400 401 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 402 { 403 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 404 } 405 406 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 407 int type, struct igmpv3_grec **ppgr) 408 { 409 struct net_device *dev = pmc->interface->dev; 410 struct igmpv3_report *pih; 411 struct igmpv3_grec *pgr; 412 413 if (!skb) 414 skb = igmpv3_newpack(dev, dev->mtu); 415 if (!skb) 416 return NULL; 417 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 418 pgr->grec_type = type; 419 pgr->grec_auxwords = 0; 420 pgr->grec_nsrcs = 0; 421 pgr->grec_mca = pmc->multiaddr; 422 pih = igmpv3_report_hdr(skb); 423 pih->ngrec = htons(ntohs(pih->ngrec)+1); 424 *ppgr = pgr; 425 return skb; 426 } 427 428 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 429 430 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 431 int type, int gdeleted, int sdeleted) 432 { 433 struct net_device *dev = pmc->interface->dev; 434 struct net *net = dev_net(dev); 435 struct igmpv3_report *pih; 436 struct igmpv3_grec *pgr = NULL; 437 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 438 int scount, stotal, first, isquery, truncate; 439 440 if (pmc->multiaddr == IGMP_ALL_HOSTS) 441 return skb; 442 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 443 return skb; 444 445 isquery = type == IGMPV3_MODE_IS_INCLUDE || 446 type == IGMPV3_MODE_IS_EXCLUDE; 447 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 448 type == IGMPV3_CHANGE_TO_EXCLUDE; 449 450 stotal = scount = 0; 451 452 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 453 454 if (!*psf_list) 455 goto empty_source; 456 457 pih = skb ? igmpv3_report_hdr(skb) : NULL; 458 459 /* EX and TO_EX get a fresh packet, if needed */ 460 if (truncate) { 461 if (pih && pih->ngrec && 462 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 463 if (skb) 464 igmpv3_sendpack(skb); 465 skb = igmpv3_newpack(dev, dev->mtu); 466 } 467 } 468 first = 1; 469 psf_prev = NULL; 470 for (psf = *psf_list; psf; psf = psf_next) { 471 __be32 *psrc; 472 473 psf_next = psf->sf_next; 474 475 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 476 psf_prev = psf; 477 continue; 478 } 479 480 /* Based on RFC3376 5.1. Should not send source-list change 481 * records when there is a filter mode change. 482 */ 483 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || 484 (!gdeleted && pmc->crcount)) && 485 (type == IGMPV3_ALLOW_NEW_SOURCES || 486 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) 487 goto decrease_sf_crcount; 488 489 /* clear marks on query responses */ 490 if (isquery) 491 psf->sf_gsresp = 0; 492 493 if (AVAILABLE(skb) < sizeof(__be32) + 494 first*sizeof(struct igmpv3_grec)) { 495 if (truncate && !first) 496 break; /* truncate these */ 497 if (pgr) 498 pgr->grec_nsrcs = htons(scount); 499 if (skb) 500 igmpv3_sendpack(skb); 501 skb = igmpv3_newpack(dev, dev->mtu); 502 first = 1; 503 scount = 0; 504 } 505 if (first) { 506 skb = add_grhead(skb, pmc, type, &pgr); 507 first = 0; 508 } 509 if (!skb) 510 return NULL; 511 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 512 *psrc = psf->sf_inaddr; 513 scount++; stotal++; 514 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 515 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 516 decrease_sf_crcount: 517 psf->sf_crcount--; 518 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 519 if (psf_prev) 520 psf_prev->sf_next = psf->sf_next; 521 else 522 *psf_list = psf->sf_next; 523 kfree(psf); 524 continue; 525 } 526 } 527 psf_prev = psf; 528 } 529 530 empty_source: 531 if (!stotal) { 532 if (type == IGMPV3_ALLOW_NEW_SOURCES || 533 type == IGMPV3_BLOCK_OLD_SOURCES) 534 return skb; 535 if (pmc->crcount || isquery) { 536 /* make sure we have room for group header */ 537 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { 538 igmpv3_sendpack(skb); 539 skb = NULL; /* add_grhead will get a new one */ 540 } 541 skb = add_grhead(skb, pmc, type, &pgr); 542 } 543 } 544 if (pgr) 545 pgr->grec_nsrcs = htons(scount); 546 547 if (isquery) 548 pmc->gsquery = 0; /* clear query state on report */ 549 return skb; 550 } 551 552 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 553 { 554 struct sk_buff *skb = NULL; 555 struct net *net = dev_net(in_dev->dev); 556 int type; 557 558 if (!pmc) { 559 rcu_read_lock(); 560 for_each_pmc_rcu(in_dev, pmc) { 561 if (pmc->multiaddr == IGMP_ALL_HOSTS) 562 continue; 563 if (ipv4_is_local_multicast(pmc->multiaddr) && 564 !net->ipv4.sysctl_igmp_llm_reports) 565 continue; 566 spin_lock_bh(&pmc->lock); 567 if (pmc->sfcount[MCAST_EXCLUDE]) 568 type = IGMPV3_MODE_IS_EXCLUDE; 569 else 570 type = IGMPV3_MODE_IS_INCLUDE; 571 skb = add_grec(skb, pmc, type, 0, 0); 572 spin_unlock_bh(&pmc->lock); 573 } 574 rcu_read_unlock(); 575 } else { 576 spin_lock_bh(&pmc->lock); 577 if (pmc->sfcount[MCAST_EXCLUDE]) 578 type = IGMPV3_MODE_IS_EXCLUDE; 579 else 580 type = IGMPV3_MODE_IS_INCLUDE; 581 skb = add_grec(skb, pmc, type, 0, 0); 582 spin_unlock_bh(&pmc->lock); 583 } 584 if (!skb) 585 return 0; 586 return igmpv3_sendpack(skb); 587 } 588 589 /* 590 * remove zero-count source records from a source filter list 591 */ 592 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 593 { 594 struct ip_sf_list *psf_prev, *psf_next, *psf; 595 596 psf_prev = NULL; 597 for (psf = *ppsf; psf; psf = psf_next) { 598 psf_next = psf->sf_next; 599 if (psf->sf_crcount == 0) { 600 if (psf_prev) 601 psf_prev->sf_next = psf->sf_next; 602 else 603 *ppsf = psf->sf_next; 604 kfree(psf); 605 } else 606 psf_prev = psf; 607 } 608 } 609 610 static void igmpv3_send_cr(struct in_device *in_dev) 611 { 612 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 613 struct sk_buff *skb = NULL; 614 int type, dtype; 615 616 rcu_read_lock(); 617 spin_lock_bh(&in_dev->mc_tomb_lock); 618 619 /* deleted MCA's */ 620 pmc_prev = NULL; 621 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { 622 pmc_next = pmc->next; 623 if (pmc->sfmode == MCAST_INCLUDE) { 624 type = IGMPV3_BLOCK_OLD_SOURCES; 625 dtype = IGMPV3_BLOCK_OLD_SOURCES; 626 skb = add_grec(skb, pmc, type, 1, 0); 627 skb = add_grec(skb, pmc, dtype, 1, 1); 628 } 629 if (pmc->crcount) { 630 if (pmc->sfmode == MCAST_EXCLUDE) { 631 type = IGMPV3_CHANGE_TO_INCLUDE; 632 skb = add_grec(skb, pmc, type, 1, 0); 633 } 634 pmc->crcount--; 635 if (pmc->crcount == 0) { 636 igmpv3_clear_zeros(&pmc->tomb); 637 igmpv3_clear_zeros(&pmc->sources); 638 } 639 } 640 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 641 if (pmc_prev) 642 pmc_prev->next = pmc_next; 643 else 644 in_dev->mc_tomb = pmc_next; 645 in_dev_put(pmc->interface); 646 kfree(pmc); 647 } else 648 pmc_prev = pmc; 649 } 650 spin_unlock_bh(&in_dev->mc_tomb_lock); 651 652 /* change recs */ 653 for_each_pmc_rcu(in_dev, pmc) { 654 spin_lock_bh(&pmc->lock); 655 if (pmc->sfcount[MCAST_EXCLUDE]) { 656 type = IGMPV3_BLOCK_OLD_SOURCES; 657 dtype = IGMPV3_ALLOW_NEW_SOURCES; 658 } else { 659 type = IGMPV3_ALLOW_NEW_SOURCES; 660 dtype = IGMPV3_BLOCK_OLD_SOURCES; 661 } 662 skb = add_grec(skb, pmc, type, 0, 0); 663 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 664 665 /* filter mode changes */ 666 if (pmc->crcount) { 667 if (pmc->sfmode == MCAST_EXCLUDE) 668 type = IGMPV3_CHANGE_TO_EXCLUDE; 669 else 670 type = IGMPV3_CHANGE_TO_INCLUDE; 671 skb = add_grec(skb, pmc, type, 0, 0); 672 pmc->crcount--; 673 } 674 spin_unlock_bh(&pmc->lock); 675 } 676 rcu_read_unlock(); 677 678 if (!skb) 679 return; 680 (void) igmpv3_sendpack(skb); 681 } 682 683 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 684 int type) 685 { 686 struct sk_buff *skb; 687 struct iphdr *iph; 688 struct igmphdr *ih; 689 struct rtable *rt; 690 struct net_device *dev = in_dev->dev; 691 struct net *net = dev_net(dev); 692 __be32 group = pmc ? pmc->multiaddr : 0; 693 struct flowi4 fl4; 694 __be32 dst; 695 int hlen, tlen; 696 697 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 698 return igmpv3_send_report(in_dev, pmc); 699 700 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 701 return 0; 702 703 if (type == IGMP_HOST_LEAVE_MESSAGE) 704 dst = IGMP_ALL_ROUTER; 705 else 706 dst = group; 707 708 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 709 0, 0, 710 IPPROTO_IGMP, 0, dev->ifindex); 711 if (IS_ERR(rt)) 712 return -1; 713 714 hlen = LL_RESERVED_SPACE(dev); 715 tlen = dev->needed_tailroom; 716 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 717 if (!skb) { 718 ip_rt_put(rt); 719 return -1; 720 } 721 skb->priority = TC_PRIO_CONTROL; 722 723 skb_dst_set(skb, &rt->dst); 724 725 skb_reserve(skb, hlen); 726 727 skb_reset_network_header(skb); 728 iph = ip_hdr(skb); 729 skb_put(skb, sizeof(struct iphdr) + 4); 730 731 iph->version = 4; 732 iph->ihl = (sizeof(struct iphdr)+4)>>2; 733 iph->tos = 0xc0; 734 iph->frag_off = htons(IP_DF); 735 iph->ttl = 1; 736 iph->daddr = dst; 737 iph->saddr = fl4.saddr; 738 iph->protocol = IPPROTO_IGMP; 739 ip_select_ident(net, skb, NULL); 740 ((u8 *)&iph[1])[0] = IPOPT_RA; 741 ((u8 *)&iph[1])[1] = 4; 742 ((u8 *)&iph[1])[2] = 0; 743 ((u8 *)&iph[1])[3] = 0; 744 745 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 746 ih->type = type; 747 ih->code = 0; 748 ih->csum = 0; 749 ih->group = group; 750 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 751 752 return ip_local_out(net, skb->sk, skb); 753 } 754 755 static void igmp_gq_timer_expire(unsigned long data) 756 { 757 struct in_device *in_dev = (struct in_device *)data; 758 759 in_dev->mr_gq_running = 0; 760 igmpv3_send_report(in_dev, NULL); 761 in_dev_put(in_dev); 762 } 763 764 static void igmp_ifc_timer_expire(unsigned long data) 765 { 766 struct in_device *in_dev = (struct in_device *)data; 767 768 igmpv3_send_cr(in_dev); 769 if (in_dev->mr_ifc_count) { 770 in_dev->mr_ifc_count--; 771 igmp_ifc_start_timer(in_dev, 772 unsolicited_report_interval(in_dev)); 773 } 774 in_dev_put(in_dev); 775 } 776 777 static void igmp_ifc_event(struct in_device *in_dev) 778 { 779 struct net *net = dev_net(in_dev->dev); 780 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 781 return; 782 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 783 igmp_ifc_start_timer(in_dev, 1); 784 } 785 786 787 static void igmp_timer_expire(unsigned long data) 788 { 789 struct ip_mc_list *im = (struct ip_mc_list *)data; 790 struct in_device *in_dev = im->interface; 791 792 spin_lock(&im->lock); 793 im->tm_running = 0; 794 795 if (im->unsolicit_count) { 796 im->unsolicit_count--; 797 igmp_start_timer(im, unsolicited_report_interval(in_dev)); 798 } 799 im->reporter = 1; 800 spin_unlock(&im->lock); 801 802 if (IGMP_V1_SEEN(in_dev)) 803 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 804 else if (IGMP_V2_SEEN(in_dev)) 805 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 806 else 807 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 808 809 ip_ma_put(im); 810 } 811 812 /* mark EXCLUDE-mode sources */ 813 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 814 { 815 struct ip_sf_list *psf; 816 int i, scount; 817 818 scount = 0; 819 for (psf = pmc->sources; psf; psf = psf->sf_next) { 820 if (scount == nsrcs) 821 break; 822 for (i = 0; i < nsrcs; i++) { 823 /* skip inactive filters */ 824 if (psf->sf_count[MCAST_INCLUDE] || 825 pmc->sfcount[MCAST_EXCLUDE] != 826 psf->sf_count[MCAST_EXCLUDE]) 827 break; 828 if (srcs[i] == psf->sf_inaddr) { 829 scount++; 830 break; 831 } 832 } 833 } 834 pmc->gsquery = 0; 835 if (scount == nsrcs) /* all sources excluded */ 836 return 0; 837 return 1; 838 } 839 840 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 841 { 842 struct ip_sf_list *psf; 843 int i, scount; 844 845 if (pmc->sfmode == MCAST_EXCLUDE) 846 return igmp_xmarksources(pmc, nsrcs, srcs); 847 848 /* mark INCLUDE-mode sources */ 849 scount = 0; 850 for (psf = pmc->sources; psf; psf = psf->sf_next) { 851 if (scount == nsrcs) 852 break; 853 for (i = 0; i < nsrcs; i++) 854 if (srcs[i] == psf->sf_inaddr) { 855 psf->sf_gsresp = 1; 856 scount++; 857 break; 858 } 859 } 860 if (!scount) { 861 pmc->gsquery = 0; 862 return 0; 863 } 864 pmc->gsquery = 1; 865 return 1; 866 } 867 868 /* return true if packet was dropped */ 869 static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 870 { 871 struct ip_mc_list *im; 872 struct net *net = dev_net(in_dev->dev); 873 874 /* Timers are only set for non-local groups */ 875 876 if (group == IGMP_ALL_HOSTS) 877 return false; 878 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 879 return false; 880 881 rcu_read_lock(); 882 for_each_pmc_rcu(in_dev, im) { 883 if (im->multiaddr == group) { 884 igmp_stop_timer(im); 885 break; 886 } 887 } 888 rcu_read_unlock(); 889 return false; 890 } 891 892 /* return true if packet was dropped */ 893 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 894 int len) 895 { 896 struct igmphdr *ih = igmp_hdr(skb); 897 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 898 struct ip_mc_list *im; 899 __be32 group = ih->group; 900 int max_delay; 901 int mark = 0; 902 struct net *net = dev_net(in_dev->dev); 903 904 905 if (len == 8) { 906 if (ih->code == 0) { 907 /* Alas, old v1 router presents here. */ 908 909 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 910 in_dev->mr_v1_seen = jiffies + 911 IGMP_V1_ROUTER_PRESENT_TIMEOUT; 912 group = 0; 913 } else { 914 /* v2 router present */ 915 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 916 in_dev->mr_v2_seen = jiffies + 917 IGMP_V2_ROUTER_PRESENT_TIMEOUT; 918 } 919 /* cancel the interface change timer */ 920 in_dev->mr_ifc_count = 0; 921 if (del_timer(&in_dev->mr_ifc_timer)) 922 __in_dev_put(in_dev); 923 /* clear deleted report items */ 924 igmpv3_clear_delrec(in_dev); 925 } else if (len < 12) { 926 return true; /* ignore bogus packet; freed by caller */ 927 } else if (IGMP_V1_SEEN(in_dev)) { 928 /* This is a v3 query with v1 queriers present */ 929 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 930 group = 0; 931 } else if (IGMP_V2_SEEN(in_dev)) { 932 /* this is a v3 query with v2 queriers present; 933 * Interpretation of the max_delay code is problematic here. 934 * A real v2 host would use ih_code directly, while v3 has a 935 * different encoding. We use the v3 encoding as more likely 936 * to be intended in a v3 query. 937 */ 938 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 939 if (!max_delay) 940 max_delay = 1; /* can't mod w/ 0 */ 941 } else { /* v3 */ 942 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 943 return true; 944 945 ih3 = igmpv3_query_hdr(skb); 946 if (ih3->nsrcs) { 947 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 948 + ntohs(ih3->nsrcs)*sizeof(__be32))) 949 return true; 950 ih3 = igmpv3_query_hdr(skb); 951 } 952 953 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 954 if (!max_delay) 955 max_delay = 1; /* can't mod w/ 0 */ 956 in_dev->mr_maxdelay = max_delay; 957 if (ih3->qrv) 958 in_dev->mr_qrv = ih3->qrv; 959 if (!group) { /* general query */ 960 if (ih3->nsrcs) 961 return true; /* no sources allowed */ 962 igmp_gq_start_timer(in_dev); 963 return false; 964 } 965 /* mark sources to include, if group & source-specific */ 966 mark = ih3->nsrcs != 0; 967 } 968 969 /* 970 * - Start the timers in all of our membership records 971 * that the query applies to for the interface on 972 * which the query arrived excl. those that belong 973 * to a "local" group (224.0.0.X) 974 * - For timers already running check if they need to 975 * be reset. 976 * - Use the igmp->igmp_code field as the maximum 977 * delay possible 978 */ 979 rcu_read_lock(); 980 for_each_pmc_rcu(in_dev, im) { 981 int changed; 982 983 if (group && group != im->multiaddr) 984 continue; 985 if (im->multiaddr == IGMP_ALL_HOSTS) 986 continue; 987 if (ipv4_is_local_multicast(im->multiaddr) && 988 !net->ipv4.sysctl_igmp_llm_reports) 989 continue; 990 spin_lock_bh(&im->lock); 991 if (im->tm_running) 992 im->gsquery = im->gsquery && mark; 993 else 994 im->gsquery = mark; 995 changed = !im->gsquery || 996 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 997 spin_unlock_bh(&im->lock); 998 if (changed) 999 igmp_mod_timer(im, max_delay); 1000 } 1001 rcu_read_unlock(); 1002 return false; 1003 } 1004 1005 /* called in rcu_read_lock() section */ 1006 int igmp_rcv(struct sk_buff *skb) 1007 { 1008 /* This basically follows the spec line by line -- see RFC1112 */ 1009 struct igmphdr *ih; 1010 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 1011 int len = skb->len; 1012 bool dropped = true; 1013 1014 if (!in_dev) 1015 goto drop; 1016 1017 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 1018 goto drop; 1019 1020 if (skb_checksum_simple_validate(skb)) 1021 goto drop; 1022 1023 ih = igmp_hdr(skb); 1024 switch (ih->type) { 1025 case IGMP_HOST_MEMBERSHIP_QUERY: 1026 dropped = igmp_heard_query(in_dev, skb, len); 1027 break; 1028 case IGMP_HOST_MEMBERSHIP_REPORT: 1029 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1030 /* Is it our report looped back? */ 1031 if (rt_is_output_route(skb_rtable(skb))) 1032 break; 1033 /* don't rely on MC router hearing unicast reports */ 1034 if (skb->pkt_type == PACKET_MULTICAST || 1035 skb->pkt_type == PACKET_BROADCAST) 1036 dropped = igmp_heard_report(in_dev, ih->group); 1037 break; 1038 case IGMP_PIM: 1039 #ifdef CONFIG_IP_PIMSM_V1 1040 return pim_rcv_v1(skb); 1041 #endif 1042 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1043 case IGMP_DVMRP: 1044 case IGMP_TRACE: 1045 case IGMP_HOST_LEAVE_MESSAGE: 1046 case IGMP_MTRACE: 1047 case IGMP_MTRACE_RESP: 1048 break; 1049 default: 1050 break; 1051 } 1052 1053 drop: 1054 if (dropped) 1055 kfree_skb(skb); 1056 else 1057 consume_skb(skb); 1058 return 0; 1059 } 1060 1061 #endif 1062 1063 1064 /* 1065 * Add a filter to a device 1066 */ 1067 1068 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1069 { 1070 char buf[MAX_ADDR_LEN]; 1071 struct net_device *dev = in_dev->dev; 1072 1073 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1074 We will get multicast token leakage, when IFF_MULTICAST 1075 is changed. This check should be done in ndo_set_rx_mode 1076 routine. Something sort of: 1077 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1078 --ANK 1079 */ 1080 if (arp_mc_map(addr, buf, dev, 0) == 0) 1081 dev_mc_add(dev, buf); 1082 } 1083 1084 /* 1085 * Remove a filter from a device 1086 */ 1087 1088 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1089 { 1090 char buf[MAX_ADDR_LEN]; 1091 struct net_device *dev = in_dev->dev; 1092 1093 if (arp_mc_map(addr, buf, dev, 0) == 0) 1094 dev_mc_del(dev, buf); 1095 } 1096 1097 #ifdef CONFIG_IP_MULTICAST 1098 /* 1099 * deleted ip_mc_list manipulation 1100 */ 1101 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1102 { 1103 struct ip_mc_list *pmc; 1104 struct net *net = dev_net(in_dev->dev); 1105 1106 /* this is an "ip_mc_list" for convenience; only the fields below 1107 * are actually used. In particular, the refcnt and users are not 1108 * used for management of the delete list. Using the same structure 1109 * for deleted items allows change reports to use common code with 1110 * non-deleted or query-response MCA's. 1111 */ 1112 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1113 if (!pmc) 1114 return; 1115 spin_lock_bh(&im->lock); 1116 pmc->interface = im->interface; 1117 in_dev_hold(in_dev); 1118 pmc->multiaddr = im->multiaddr; 1119 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1120 pmc->sfmode = im->sfmode; 1121 if (pmc->sfmode == MCAST_INCLUDE) { 1122 struct ip_sf_list *psf; 1123 1124 pmc->tomb = im->tomb; 1125 pmc->sources = im->sources; 1126 im->tomb = im->sources = NULL; 1127 for (psf = pmc->sources; psf; psf = psf->sf_next) 1128 psf->sf_crcount = pmc->crcount; 1129 } 1130 spin_unlock_bh(&im->lock); 1131 1132 spin_lock_bh(&in_dev->mc_tomb_lock); 1133 pmc->next = in_dev->mc_tomb; 1134 in_dev->mc_tomb = pmc; 1135 spin_unlock_bh(&in_dev->mc_tomb_lock); 1136 } 1137 1138 /* 1139 * restore ip_mc_list deleted records 1140 */ 1141 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1142 { 1143 struct ip_mc_list *pmc, *pmc_prev; 1144 struct ip_sf_list *psf; 1145 struct net *net = dev_net(in_dev->dev); 1146 __be32 multiaddr = im->multiaddr; 1147 1148 spin_lock_bh(&in_dev->mc_tomb_lock); 1149 pmc_prev = NULL; 1150 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1151 if (pmc->multiaddr == multiaddr) 1152 break; 1153 pmc_prev = pmc; 1154 } 1155 if (pmc) { 1156 if (pmc_prev) 1157 pmc_prev->next = pmc->next; 1158 else 1159 in_dev->mc_tomb = pmc->next; 1160 } 1161 spin_unlock_bh(&in_dev->mc_tomb_lock); 1162 1163 spin_lock_bh(&im->lock); 1164 if (pmc) { 1165 im->interface = pmc->interface; 1166 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1167 im->sfmode = pmc->sfmode; 1168 if (pmc->sfmode == MCAST_INCLUDE) { 1169 im->tomb = pmc->tomb; 1170 im->sources = pmc->sources; 1171 for (psf = im->sources; psf; psf = psf->sf_next) 1172 psf->sf_crcount = im->crcount; 1173 } 1174 in_dev_put(pmc->interface); 1175 } 1176 spin_unlock_bh(&im->lock); 1177 } 1178 1179 /* 1180 * flush ip_mc_list deleted records 1181 */ 1182 static void igmpv3_clear_delrec(struct in_device *in_dev) 1183 { 1184 struct ip_mc_list *pmc, *nextpmc; 1185 1186 spin_lock_bh(&in_dev->mc_tomb_lock); 1187 pmc = in_dev->mc_tomb; 1188 in_dev->mc_tomb = NULL; 1189 spin_unlock_bh(&in_dev->mc_tomb_lock); 1190 1191 for (; pmc; pmc = nextpmc) { 1192 nextpmc = pmc->next; 1193 ip_mc_clear_src(pmc); 1194 in_dev_put(pmc->interface); 1195 kfree(pmc); 1196 } 1197 /* clear dead sources, too */ 1198 rcu_read_lock(); 1199 for_each_pmc_rcu(in_dev, pmc) { 1200 struct ip_sf_list *psf, *psf_next; 1201 1202 spin_lock_bh(&pmc->lock); 1203 psf = pmc->tomb; 1204 pmc->tomb = NULL; 1205 spin_unlock_bh(&pmc->lock); 1206 for (; psf; psf = psf_next) { 1207 psf_next = psf->sf_next; 1208 kfree(psf); 1209 } 1210 } 1211 rcu_read_unlock(); 1212 } 1213 #endif 1214 1215 static void igmp_group_dropped(struct ip_mc_list *im) 1216 { 1217 struct in_device *in_dev = im->interface; 1218 #ifdef CONFIG_IP_MULTICAST 1219 struct net *net = dev_net(in_dev->dev); 1220 int reporter; 1221 #endif 1222 1223 if (im->loaded) { 1224 im->loaded = 0; 1225 ip_mc_filter_del(in_dev, im->multiaddr); 1226 } 1227 1228 #ifdef CONFIG_IP_MULTICAST 1229 if (im->multiaddr == IGMP_ALL_HOSTS) 1230 return; 1231 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1232 return; 1233 1234 reporter = im->reporter; 1235 igmp_stop_timer(im); 1236 1237 if (!in_dev->dead) { 1238 if (IGMP_V1_SEEN(in_dev)) 1239 return; 1240 if (IGMP_V2_SEEN(in_dev)) { 1241 if (reporter) 1242 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1243 return; 1244 } 1245 /* IGMPv3 */ 1246 igmpv3_add_delrec(in_dev, im); 1247 1248 igmp_ifc_event(in_dev); 1249 } 1250 #endif 1251 } 1252 1253 static void igmp_group_added(struct ip_mc_list *im) 1254 { 1255 struct in_device *in_dev = im->interface; 1256 #ifdef CONFIG_IP_MULTICAST 1257 struct net *net = dev_net(in_dev->dev); 1258 #endif 1259 1260 if (im->loaded == 0) { 1261 im->loaded = 1; 1262 ip_mc_filter_add(in_dev, im->multiaddr); 1263 } 1264 1265 #ifdef CONFIG_IP_MULTICAST 1266 if (im->multiaddr == IGMP_ALL_HOSTS) 1267 return; 1268 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1269 return; 1270 1271 if (in_dev->dead) 1272 return; 1273 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1274 spin_lock_bh(&im->lock); 1275 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1276 spin_unlock_bh(&im->lock); 1277 return; 1278 } 1279 /* else, v3 */ 1280 1281 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1282 igmp_ifc_event(in_dev); 1283 #endif 1284 } 1285 1286 1287 /* 1288 * Multicast list managers 1289 */ 1290 1291 static u32 ip_mc_hash(const struct ip_mc_list *im) 1292 { 1293 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1294 } 1295 1296 static void ip_mc_hash_add(struct in_device *in_dev, 1297 struct ip_mc_list *im) 1298 { 1299 struct ip_mc_list __rcu **mc_hash; 1300 u32 hash; 1301 1302 mc_hash = rtnl_dereference(in_dev->mc_hash); 1303 if (mc_hash) { 1304 hash = ip_mc_hash(im); 1305 im->next_hash = mc_hash[hash]; 1306 rcu_assign_pointer(mc_hash[hash], im); 1307 return; 1308 } 1309 1310 /* do not use a hash table for small number of items */ 1311 if (in_dev->mc_count < 4) 1312 return; 1313 1314 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1315 GFP_KERNEL); 1316 if (!mc_hash) 1317 return; 1318 1319 for_each_pmc_rtnl(in_dev, im) { 1320 hash = ip_mc_hash(im); 1321 im->next_hash = mc_hash[hash]; 1322 RCU_INIT_POINTER(mc_hash[hash], im); 1323 } 1324 1325 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1326 } 1327 1328 static void ip_mc_hash_remove(struct in_device *in_dev, 1329 struct ip_mc_list *im) 1330 { 1331 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1332 struct ip_mc_list *aux; 1333 1334 if (!mc_hash) 1335 return; 1336 mc_hash += ip_mc_hash(im); 1337 while ((aux = rtnl_dereference(*mc_hash)) != im) 1338 mc_hash = &aux->next_hash; 1339 *mc_hash = im->next_hash; 1340 } 1341 1342 1343 /* 1344 * A socket has joined a multicast group on device dev. 1345 */ 1346 1347 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1348 { 1349 struct ip_mc_list *im; 1350 #ifdef CONFIG_IP_MULTICAST 1351 struct net *net = dev_net(in_dev->dev); 1352 #endif 1353 1354 ASSERT_RTNL(); 1355 1356 for_each_pmc_rtnl(in_dev, im) { 1357 if (im->multiaddr == addr) { 1358 im->users++; 1359 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1360 goto out; 1361 } 1362 } 1363 1364 im = kzalloc(sizeof(*im), GFP_KERNEL); 1365 if (!im) 1366 goto out; 1367 1368 im->users = 1; 1369 im->interface = in_dev; 1370 in_dev_hold(in_dev); 1371 im->multiaddr = addr; 1372 /* initial mode is (EX, empty) */ 1373 im->sfmode = MCAST_EXCLUDE; 1374 im->sfcount[MCAST_EXCLUDE] = 1; 1375 atomic_set(&im->refcnt, 1); 1376 spin_lock_init(&im->lock); 1377 #ifdef CONFIG_IP_MULTICAST 1378 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); 1379 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; 1380 #endif 1381 1382 im->next_rcu = in_dev->mc_list; 1383 in_dev->mc_count++; 1384 rcu_assign_pointer(in_dev->mc_list, im); 1385 1386 ip_mc_hash_add(in_dev, im); 1387 1388 #ifdef CONFIG_IP_MULTICAST 1389 igmpv3_del_delrec(in_dev, im); 1390 #endif 1391 igmp_group_added(im); 1392 if (!in_dev->dead) 1393 ip_rt_multicast_event(in_dev); 1394 out: 1395 return; 1396 } 1397 EXPORT_SYMBOL(ip_mc_inc_group); 1398 1399 static int ip_mc_check_iphdr(struct sk_buff *skb) 1400 { 1401 const struct iphdr *iph; 1402 unsigned int len; 1403 unsigned int offset = skb_network_offset(skb) + sizeof(*iph); 1404 1405 if (!pskb_may_pull(skb, offset)) 1406 return -EINVAL; 1407 1408 iph = ip_hdr(skb); 1409 1410 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) 1411 return -EINVAL; 1412 1413 offset += ip_hdrlen(skb) - sizeof(*iph); 1414 1415 if (!pskb_may_pull(skb, offset)) 1416 return -EINVAL; 1417 1418 iph = ip_hdr(skb); 1419 1420 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1421 return -EINVAL; 1422 1423 len = skb_network_offset(skb) + ntohs(iph->tot_len); 1424 if (skb->len < len || len < offset) 1425 return -EINVAL; 1426 1427 skb_set_transport_header(skb, offset); 1428 1429 return 0; 1430 } 1431 1432 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) 1433 { 1434 unsigned int len = skb_transport_offset(skb); 1435 1436 len += sizeof(struct igmpv3_report); 1437 1438 return pskb_may_pull(skb, len) ? 0 : -EINVAL; 1439 } 1440 1441 static int ip_mc_check_igmp_query(struct sk_buff *skb) 1442 { 1443 unsigned int len = skb_transport_offset(skb); 1444 1445 len += sizeof(struct igmphdr); 1446 if (skb->len < len) 1447 return -EINVAL; 1448 1449 /* IGMPv{1,2}? */ 1450 if (skb->len != len) { 1451 /* or IGMPv3? */ 1452 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); 1453 if (skb->len < len || !pskb_may_pull(skb, len)) 1454 return -EINVAL; 1455 } 1456 1457 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1458 * all-systems destination addresses (224.0.0.1) for general queries 1459 */ 1460 if (!igmp_hdr(skb)->group && 1461 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) 1462 return -EINVAL; 1463 1464 return 0; 1465 } 1466 1467 static int ip_mc_check_igmp_msg(struct sk_buff *skb) 1468 { 1469 switch (igmp_hdr(skb)->type) { 1470 case IGMP_HOST_LEAVE_MESSAGE: 1471 case IGMP_HOST_MEMBERSHIP_REPORT: 1472 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1473 /* fall through */ 1474 return 0; 1475 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1476 return ip_mc_check_igmp_reportv3(skb); 1477 case IGMP_HOST_MEMBERSHIP_QUERY: 1478 return ip_mc_check_igmp_query(skb); 1479 default: 1480 return -ENOMSG; 1481 } 1482 } 1483 1484 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) 1485 { 1486 return skb_checksum_simple_validate(skb); 1487 } 1488 1489 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1490 1491 { 1492 struct sk_buff *skb_chk; 1493 unsigned int transport_len; 1494 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); 1495 int ret = -EINVAL; 1496 1497 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 1498 1499 skb_chk = skb_checksum_trimmed(skb, transport_len, 1500 ip_mc_validate_checksum); 1501 if (!skb_chk) 1502 goto err; 1503 1504 if (!pskb_may_pull(skb_chk, len)) 1505 goto err; 1506 1507 ret = ip_mc_check_igmp_msg(skb_chk); 1508 if (ret) 1509 goto err; 1510 1511 if (skb_trimmed) 1512 *skb_trimmed = skb_chk; 1513 /* free now unneeded clone */ 1514 else if (skb_chk != skb) 1515 kfree_skb(skb_chk); 1516 1517 ret = 0; 1518 1519 err: 1520 if (ret && skb_chk && skb_chk != skb) 1521 kfree_skb(skb_chk); 1522 1523 return ret; 1524 } 1525 1526 /** 1527 * ip_mc_check_igmp - checks whether this is a sane IGMP packet 1528 * @skb: the skb to validate 1529 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) 1530 * 1531 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets 1532 * skb transport header accordingly and returns zero. 1533 * 1534 * -EINVAL: A broken packet was detected, i.e. it violates some internet 1535 * standard 1536 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. 1537 * -ENOMEM: A memory allocation failure happened. 1538 * 1539 * Optionally, an skb pointer might be provided via skb_trimmed (or set it 1540 * to NULL): After parsing an IGMP packet successfully it will point to 1541 * an skb which has its tail aligned to the IP packet end. This might 1542 * either be the originally provided skb or a trimmed, cloned version if 1543 * the skb frame had data beyond the IP packet. A cloned skb allows us 1544 * to leave the original skb and its full frame unchanged (which might be 1545 * desirable for layer 2 frame jugglers). 1546 * 1547 * Caller needs to set the skb network header and free any returned skb if it 1548 * differs from the provided skb. 1549 */ 1550 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1551 { 1552 int ret = ip_mc_check_iphdr(skb); 1553 1554 if (ret < 0) 1555 return ret; 1556 1557 if (ip_hdr(skb)->protocol != IPPROTO_IGMP) 1558 return -ENOMSG; 1559 1560 return __ip_mc_check_igmp(skb, skb_trimmed); 1561 } 1562 EXPORT_SYMBOL(ip_mc_check_igmp); 1563 1564 /* 1565 * Resend IGMP JOIN report; used by netdev notifier. 1566 */ 1567 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1568 { 1569 #ifdef CONFIG_IP_MULTICAST 1570 struct ip_mc_list *im; 1571 int type; 1572 struct net *net = dev_net(in_dev->dev); 1573 1574 ASSERT_RTNL(); 1575 1576 for_each_pmc_rtnl(in_dev, im) { 1577 if (im->multiaddr == IGMP_ALL_HOSTS) 1578 continue; 1579 if (ipv4_is_local_multicast(im->multiaddr) && 1580 !net->ipv4.sysctl_igmp_llm_reports) 1581 continue; 1582 1583 /* a failover is happening and switches 1584 * must be notified immediately 1585 */ 1586 if (IGMP_V1_SEEN(in_dev)) 1587 type = IGMP_HOST_MEMBERSHIP_REPORT; 1588 else if (IGMP_V2_SEEN(in_dev)) 1589 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1590 else 1591 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1592 igmp_send_report(in_dev, im, type); 1593 } 1594 #endif 1595 } 1596 1597 /* 1598 * A socket has left a multicast group on device dev 1599 */ 1600 1601 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1602 { 1603 struct ip_mc_list *i; 1604 struct ip_mc_list __rcu **ip; 1605 1606 ASSERT_RTNL(); 1607 1608 for (ip = &in_dev->mc_list; 1609 (i = rtnl_dereference(*ip)) != NULL; 1610 ip = &i->next_rcu) { 1611 if (i->multiaddr == addr) { 1612 if (--i->users == 0) { 1613 ip_mc_hash_remove(in_dev, i); 1614 *ip = i->next_rcu; 1615 in_dev->mc_count--; 1616 igmp_group_dropped(i); 1617 ip_mc_clear_src(i); 1618 1619 if (!in_dev->dead) 1620 ip_rt_multicast_event(in_dev); 1621 1622 ip_ma_put(i); 1623 return; 1624 } 1625 break; 1626 } 1627 } 1628 } 1629 EXPORT_SYMBOL(ip_mc_dec_group); 1630 1631 /* Device changing type */ 1632 1633 void ip_mc_unmap(struct in_device *in_dev) 1634 { 1635 struct ip_mc_list *pmc; 1636 1637 ASSERT_RTNL(); 1638 1639 for_each_pmc_rtnl(in_dev, pmc) 1640 igmp_group_dropped(pmc); 1641 } 1642 1643 void ip_mc_remap(struct in_device *in_dev) 1644 { 1645 struct ip_mc_list *pmc; 1646 1647 ASSERT_RTNL(); 1648 1649 for_each_pmc_rtnl(in_dev, pmc) { 1650 #ifdef CONFIG_IP_MULTICAST 1651 igmpv3_del_delrec(in_dev, pmc); 1652 #endif 1653 igmp_group_added(pmc); 1654 } 1655 } 1656 1657 /* Device going down */ 1658 1659 void ip_mc_down(struct in_device *in_dev) 1660 { 1661 struct ip_mc_list *pmc; 1662 1663 ASSERT_RTNL(); 1664 1665 for_each_pmc_rtnl(in_dev, pmc) 1666 igmp_group_dropped(pmc); 1667 1668 #ifdef CONFIG_IP_MULTICAST 1669 in_dev->mr_ifc_count = 0; 1670 if (del_timer(&in_dev->mr_ifc_timer)) 1671 __in_dev_put(in_dev); 1672 in_dev->mr_gq_running = 0; 1673 if (del_timer(&in_dev->mr_gq_timer)) 1674 __in_dev_put(in_dev); 1675 #endif 1676 1677 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1678 } 1679 1680 void ip_mc_init_dev(struct in_device *in_dev) 1681 { 1682 #ifdef CONFIG_IP_MULTICAST 1683 struct net *net = dev_net(in_dev->dev); 1684 #endif 1685 ASSERT_RTNL(); 1686 1687 #ifdef CONFIG_IP_MULTICAST 1688 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1689 (unsigned long)in_dev); 1690 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1691 (unsigned long)in_dev); 1692 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1693 #endif 1694 1695 spin_lock_init(&in_dev->mc_tomb_lock); 1696 } 1697 1698 /* Device going up */ 1699 1700 void ip_mc_up(struct in_device *in_dev) 1701 { 1702 struct ip_mc_list *pmc; 1703 #ifdef CONFIG_IP_MULTICAST 1704 struct net *net = dev_net(in_dev->dev); 1705 #endif 1706 1707 ASSERT_RTNL(); 1708 1709 #ifdef CONFIG_IP_MULTICAST 1710 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1711 #endif 1712 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1713 1714 for_each_pmc_rtnl(in_dev, pmc) { 1715 #ifdef CONFIG_IP_MULTICAST 1716 igmpv3_del_delrec(in_dev, pmc); 1717 #endif 1718 igmp_group_added(pmc); 1719 } 1720 } 1721 1722 /* 1723 * Device is about to be destroyed: clean up. 1724 */ 1725 1726 void ip_mc_destroy_dev(struct in_device *in_dev) 1727 { 1728 struct ip_mc_list *i; 1729 1730 ASSERT_RTNL(); 1731 1732 /* Deactivate timers */ 1733 ip_mc_down(in_dev); 1734 #ifdef CONFIG_IP_MULTICAST 1735 igmpv3_clear_delrec(in_dev); 1736 #endif 1737 1738 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1739 in_dev->mc_list = i->next_rcu; 1740 in_dev->mc_count--; 1741 ip_ma_put(i); 1742 } 1743 } 1744 1745 /* RTNL is locked */ 1746 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1747 { 1748 struct net_device *dev = NULL; 1749 struct in_device *idev = NULL; 1750 1751 if (imr->imr_ifindex) { 1752 idev = inetdev_by_index(net, imr->imr_ifindex); 1753 return idev; 1754 } 1755 if (imr->imr_address.s_addr) { 1756 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1757 if (!dev) 1758 return NULL; 1759 } 1760 1761 if (!dev) { 1762 struct rtable *rt = ip_route_output(net, 1763 imr->imr_multiaddr.s_addr, 1764 0, 0, 0); 1765 if (!IS_ERR(rt)) { 1766 dev = rt->dst.dev; 1767 ip_rt_put(rt); 1768 } 1769 } 1770 if (dev) { 1771 imr->imr_ifindex = dev->ifindex; 1772 idev = __in_dev_get_rtnl(dev); 1773 } 1774 return idev; 1775 } 1776 1777 /* 1778 * Join a socket to a group 1779 */ 1780 1781 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1782 __be32 *psfsrc) 1783 { 1784 struct ip_sf_list *psf, *psf_prev; 1785 int rv = 0; 1786 1787 psf_prev = NULL; 1788 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1789 if (psf->sf_inaddr == *psfsrc) 1790 break; 1791 psf_prev = psf; 1792 } 1793 if (!psf || psf->sf_count[sfmode] == 0) { 1794 /* source filter not found, or count wrong => bug */ 1795 return -ESRCH; 1796 } 1797 psf->sf_count[sfmode]--; 1798 if (psf->sf_count[sfmode] == 0) { 1799 ip_rt_multicast_event(pmc->interface); 1800 } 1801 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1802 #ifdef CONFIG_IP_MULTICAST 1803 struct in_device *in_dev = pmc->interface; 1804 struct net *net = dev_net(in_dev->dev); 1805 #endif 1806 1807 /* no more filters for this source */ 1808 if (psf_prev) 1809 psf_prev->sf_next = psf->sf_next; 1810 else 1811 pmc->sources = psf->sf_next; 1812 #ifdef CONFIG_IP_MULTICAST 1813 if (psf->sf_oldin && 1814 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1815 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1816 psf->sf_next = pmc->tomb; 1817 pmc->tomb = psf; 1818 rv = 1; 1819 } else 1820 #endif 1821 kfree(psf); 1822 } 1823 return rv; 1824 } 1825 1826 #ifndef CONFIG_IP_MULTICAST 1827 #define igmp_ifc_event(x) do { } while (0) 1828 #endif 1829 1830 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1831 int sfcount, __be32 *psfsrc, int delta) 1832 { 1833 struct ip_mc_list *pmc; 1834 int changerec = 0; 1835 int i, err; 1836 1837 if (!in_dev) 1838 return -ENODEV; 1839 rcu_read_lock(); 1840 for_each_pmc_rcu(in_dev, pmc) { 1841 if (*pmca == pmc->multiaddr) 1842 break; 1843 } 1844 if (!pmc) { 1845 /* MCA not found?? bug */ 1846 rcu_read_unlock(); 1847 return -ESRCH; 1848 } 1849 spin_lock_bh(&pmc->lock); 1850 rcu_read_unlock(); 1851 #ifdef CONFIG_IP_MULTICAST 1852 sf_markstate(pmc); 1853 #endif 1854 if (!delta) { 1855 err = -EINVAL; 1856 if (!pmc->sfcount[sfmode]) 1857 goto out_unlock; 1858 pmc->sfcount[sfmode]--; 1859 } 1860 err = 0; 1861 for (i = 0; i < sfcount; i++) { 1862 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1863 1864 changerec |= rv > 0; 1865 if (!err && rv < 0) 1866 err = rv; 1867 } 1868 if (pmc->sfmode == MCAST_EXCLUDE && 1869 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1870 pmc->sfcount[MCAST_INCLUDE]) { 1871 #ifdef CONFIG_IP_MULTICAST 1872 struct ip_sf_list *psf; 1873 struct net *net = dev_net(in_dev->dev); 1874 #endif 1875 1876 /* filter mode change */ 1877 pmc->sfmode = MCAST_INCLUDE; 1878 #ifdef CONFIG_IP_MULTICAST 1879 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1880 in_dev->mr_ifc_count = pmc->crcount; 1881 for (psf = pmc->sources; psf; psf = psf->sf_next) 1882 psf->sf_crcount = 0; 1883 igmp_ifc_event(pmc->interface); 1884 } else if (sf_setstate(pmc) || changerec) { 1885 igmp_ifc_event(pmc->interface); 1886 #endif 1887 } 1888 out_unlock: 1889 spin_unlock_bh(&pmc->lock); 1890 return err; 1891 } 1892 1893 /* 1894 * Add multicast single-source filter to the interface list 1895 */ 1896 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1897 __be32 *psfsrc) 1898 { 1899 struct ip_sf_list *psf, *psf_prev; 1900 1901 psf_prev = NULL; 1902 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1903 if (psf->sf_inaddr == *psfsrc) 1904 break; 1905 psf_prev = psf; 1906 } 1907 if (!psf) { 1908 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1909 if (!psf) 1910 return -ENOBUFS; 1911 psf->sf_inaddr = *psfsrc; 1912 if (psf_prev) { 1913 psf_prev->sf_next = psf; 1914 } else 1915 pmc->sources = psf; 1916 } 1917 psf->sf_count[sfmode]++; 1918 if (psf->sf_count[sfmode] == 1) { 1919 ip_rt_multicast_event(pmc->interface); 1920 } 1921 return 0; 1922 } 1923 1924 #ifdef CONFIG_IP_MULTICAST 1925 static void sf_markstate(struct ip_mc_list *pmc) 1926 { 1927 struct ip_sf_list *psf; 1928 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1929 1930 for (psf = pmc->sources; psf; psf = psf->sf_next) 1931 if (pmc->sfcount[MCAST_EXCLUDE]) { 1932 psf->sf_oldin = mca_xcount == 1933 psf->sf_count[MCAST_EXCLUDE] && 1934 !psf->sf_count[MCAST_INCLUDE]; 1935 } else 1936 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1937 } 1938 1939 static int sf_setstate(struct ip_mc_list *pmc) 1940 { 1941 struct ip_sf_list *psf, *dpsf; 1942 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1943 int qrv = pmc->interface->mr_qrv; 1944 int new_in, rv; 1945 1946 rv = 0; 1947 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1948 if (pmc->sfcount[MCAST_EXCLUDE]) { 1949 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1950 !psf->sf_count[MCAST_INCLUDE]; 1951 } else 1952 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1953 if (new_in) { 1954 if (!psf->sf_oldin) { 1955 struct ip_sf_list *prev = NULL; 1956 1957 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 1958 if (dpsf->sf_inaddr == psf->sf_inaddr) 1959 break; 1960 prev = dpsf; 1961 } 1962 if (dpsf) { 1963 if (prev) 1964 prev->sf_next = dpsf->sf_next; 1965 else 1966 pmc->tomb = dpsf->sf_next; 1967 kfree(dpsf); 1968 } 1969 psf->sf_crcount = qrv; 1970 rv++; 1971 } 1972 } else if (psf->sf_oldin) { 1973 1974 psf->sf_crcount = 0; 1975 /* 1976 * add or update "delete" records if an active filter 1977 * is now inactive 1978 */ 1979 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 1980 if (dpsf->sf_inaddr == psf->sf_inaddr) 1981 break; 1982 if (!dpsf) { 1983 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1984 if (!dpsf) 1985 continue; 1986 *dpsf = *psf; 1987 /* pmc->lock held by callers */ 1988 dpsf->sf_next = pmc->tomb; 1989 pmc->tomb = dpsf; 1990 } 1991 dpsf->sf_crcount = qrv; 1992 rv++; 1993 } 1994 } 1995 return rv; 1996 } 1997 #endif 1998 1999 /* 2000 * Add multicast source filter list to the interface list 2001 */ 2002 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 2003 int sfcount, __be32 *psfsrc, int delta) 2004 { 2005 struct ip_mc_list *pmc; 2006 int isexclude; 2007 int i, err; 2008 2009 if (!in_dev) 2010 return -ENODEV; 2011 rcu_read_lock(); 2012 for_each_pmc_rcu(in_dev, pmc) { 2013 if (*pmca == pmc->multiaddr) 2014 break; 2015 } 2016 if (!pmc) { 2017 /* MCA not found?? bug */ 2018 rcu_read_unlock(); 2019 return -ESRCH; 2020 } 2021 spin_lock_bh(&pmc->lock); 2022 rcu_read_unlock(); 2023 2024 #ifdef CONFIG_IP_MULTICAST 2025 sf_markstate(pmc); 2026 #endif 2027 isexclude = pmc->sfmode == MCAST_EXCLUDE; 2028 if (!delta) 2029 pmc->sfcount[sfmode]++; 2030 err = 0; 2031 for (i = 0; i < sfcount; i++) { 2032 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2033 if (err) 2034 break; 2035 } 2036 if (err) { 2037 int j; 2038 2039 if (!delta) 2040 pmc->sfcount[sfmode]--; 2041 for (j = 0; j < i; j++) 2042 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2043 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 2044 #ifdef CONFIG_IP_MULTICAST 2045 struct ip_sf_list *psf; 2046 struct net *net = dev_net(pmc->interface->dev); 2047 in_dev = pmc->interface; 2048 #endif 2049 2050 /* filter mode change */ 2051 if (pmc->sfcount[MCAST_EXCLUDE]) 2052 pmc->sfmode = MCAST_EXCLUDE; 2053 else if (pmc->sfcount[MCAST_INCLUDE]) 2054 pmc->sfmode = MCAST_INCLUDE; 2055 #ifdef CONFIG_IP_MULTICAST 2056 /* else no filters; keep old mode for reports */ 2057 2058 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 2059 in_dev->mr_ifc_count = pmc->crcount; 2060 for (psf = pmc->sources; psf; psf = psf->sf_next) 2061 psf->sf_crcount = 0; 2062 igmp_ifc_event(in_dev); 2063 } else if (sf_setstate(pmc)) { 2064 igmp_ifc_event(in_dev); 2065 #endif 2066 } 2067 spin_unlock_bh(&pmc->lock); 2068 return err; 2069 } 2070 2071 static void ip_mc_clear_src(struct ip_mc_list *pmc) 2072 { 2073 struct ip_sf_list *psf, *nextpsf; 2074 2075 for (psf = pmc->tomb; psf; psf = nextpsf) { 2076 nextpsf = psf->sf_next; 2077 kfree(psf); 2078 } 2079 pmc->tomb = NULL; 2080 for (psf = pmc->sources; psf; psf = nextpsf) { 2081 nextpsf = psf->sf_next; 2082 kfree(psf); 2083 } 2084 pmc->sources = NULL; 2085 pmc->sfmode = MCAST_EXCLUDE; 2086 pmc->sfcount[MCAST_INCLUDE] = 0; 2087 pmc->sfcount[MCAST_EXCLUDE] = 1; 2088 } 2089 2090 /* Join a multicast group 2091 */ 2092 2093 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) 2094 { 2095 __be32 addr = imr->imr_multiaddr.s_addr; 2096 struct ip_mc_socklist *iml, *i; 2097 struct in_device *in_dev; 2098 struct inet_sock *inet = inet_sk(sk); 2099 struct net *net = sock_net(sk); 2100 int ifindex; 2101 int count = 0; 2102 int err; 2103 2104 ASSERT_RTNL(); 2105 2106 if (!ipv4_is_multicast(addr)) 2107 return -EINVAL; 2108 2109 in_dev = ip_mc_find_dev(net, imr); 2110 2111 if (!in_dev) { 2112 err = -ENODEV; 2113 goto done; 2114 } 2115 2116 err = -EADDRINUSE; 2117 ifindex = imr->imr_ifindex; 2118 for_each_pmc_rtnl(inet, i) { 2119 if (i->multi.imr_multiaddr.s_addr == addr && 2120 i->multi.imr_ifindex == ifindex) 2121 goto done; 2122 count++; 2123 } 2124 err = -ENOBUFS; 2125 if (count >= net->ipv4.sysctl_igmp_max_memberships) 2126 goto done; 2127 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 2128 if (!iml) 2129 goto done; 2130 2131 memcpy(&iml->multi, imr, sizeof(*imr)); 2132 iml->next_rcu = inet->mc_list; 2133 iml->sflist = NULL; 2134 iml->sfmode = MCAST_EXCLUDE; 2135 rcu_assign_pointer(inet->mc_list, iml); 2136 ip_mc_inc_group(in_dev, addr); 2137 err = 0; 2138 done: 2139 return err; 2140 } 2141 EXPORT_SYMBOL(ip_mc_join_group); 2142 2143 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 2144 struct in_device *in_dev) 2145 { 2146 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 2147 int err; 2148 2149 if (!psf) { 2150 /* any-source empty exclude case */ 2151 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2152 iml->sfmode, 0, NULL, 0); 2153 } 2154 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2155 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 2156 RCU_INIT_POINTER(iml->sflist, NULL); 2157 /* decrease mem now to avoid the memleak warning */ 2158 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 2159 kfree_rcu(psf, rcu); 2160 return err; 2161 } 2162 2163 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 2164 { 2165 struct inet_sock *inet = inet_sk(sk); 2166 struct ip_mc_socklist *iml; 2167 struct ip_mc_socklist __rcu **imlp; 2168 struct in_device *in_dev; 2169 struct net *net = sock_net(sk); 2170 __be32 group = imr->imr_multiaddr.s_addr; 2171 u32 ifindex; 2172 int ret = -EADDRNOTAVAIL; 2173 2174 ASSERT_RTNL(); 2175 2176 in_dev = ip_mc_find_dev(net, imr); 2177 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { 2178 ret = -ENODEV; 2179 goto out; 2180 } 2181 ifindex = imr->imr_ifindex; 2182 for (imlp = &inet->mc_list; 2183 (iml = rtnl_dereference(*imlp)) != NULL; 2184 imlp = &iml->next_rcu) { 2185 if (iml->multi.imr_multiaddr.s_addr != group) 2186 continue; 2187 if (ifindex) { 2188 if (iml->multi.imr_ifindex != ifindex) 2189 continue; 2190 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 2191 iml->multi.imr_address.s_addr) 2192 continue; 2193 2194 (void) ip_mc_leave_src(sk, iml, in_dev); 2195 2196 *imlp = iml->next_rcu; 2197 2198 if (in_dev) 2199 ip_mc_dec_group(in_dev, group); 2200 2201 /* decrease mem now to avoid the memleak warning */ 2202 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2203 kfree_rcu(iml, rcu); 2204 return 0; 2205 } 2206 out: 2207 return ret; 2208 } 2209 EXPORT_SYMBOL(ip_mc_leave_group); 2210 2211 int ip_mc_source(int add, int omode, struct sock *sk, struct 2212 ip_mreq_source *mreqs, int ifindex) 2213 { 2214 int err; 2215 struct ip_mreqn imr; 2216 __be32 addr = mreqs->imr_multiaddr; 2217 struct ip_mc_socklist *pmc; 2218 struct in_device *in_dev = NULL; 2219 struct inet_sock *inet = inet_sk(sk); 2220 struct ip_sf_socklist *psl; 2221 struct net *net = sock_net(sk); 2222 int leavegroup = 0; 2223 int i, j, rv; 2224 2225 if (!ipv4_is_multicast(addr)) 2226 return -EINVAL; 2227 2228 ASSERT_RTNL(); 2229 2230 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2231 imr.imr_address.s_addr = mreqs->imr_interface; 2232 imr.imr_ifindex = ifindex; 2233 in_dev = ip_mc_find_dev(net, &imr); 2234 2235 if (!in_dev) { 2236 err = -ENODEV; 2237 goto done; 2238 } 2239 err = -EADDRNOTAVAIL; 2240 2241 for_each_pmc_rtnl(inet, pmc) { 2242 if ((pmc->multi.imr_multiaddr.s_addr == 2243 imr.imr_multiaddr.s_addr) && 2244 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2245 break; 2246 } 2247 if (!pmc) { /* must have a prior join */ 2248 err = -EINVAL; 2249 goto done; 2250 } 2251 /* if a source filter was set, must be the same mode as before */ 2252 if (pmc->sflist) { 2253 if (pmc->sfmode != omode) { 2254 err = -EINVAL; 2255 goto done; 2256 } 2257 } else if (pmc->sfmode != omode) { 2258 /* allow mode switches for empty-set filters */ 2259 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2260 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2261 NULL, 0); 2262 pmc->sfmode = omode; 2263 } 2264 2265 psl = rtnl_dereference(pmc->sflist); 2266 if (!add) { 2267 if (!psl) 2268 goto done; /* err = -EADDRNOTAVAIL */ 2269 rv = !0; 2270 for (i = 0; i < psl->sl_count; i++) { 2271 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2272 sizeof(__be32)); 2273 if (rv == 0) 2274 break; 2275 } 2276 if (rv) /* source not found */ 2277 goto done; /* err = -EADDRNOTAVAIL */ 2278 2279 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2280 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2281 leavegroup = 1; 2282 goto done; 2283 } 2284 2285 /* update the interface filter */ 2286 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2287 &mreqs->imr_sourceaddr, 1); 2288 2289 for (j = i+1; j < psl->sl_count; j++) 2290 psl->sl_addr[j-1] = psl->sl_addr[j]; 2291 psl->sl_count--; 2292 err = 0; 2293 goto done; 2294 } 2295 /* else, add a new source to the filter */ 2296 2297 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { 2298 err = -ENOBUFS; 2299 goto done; 2300 } 2301 if (!psl || psl->sl_count == psl->sl_max) { 2302 struct ip_sf_socklist *newpsl; 2303 int count = IP_SFBLOCK; 2304 2305 if (psl) 2306 count += psl->sl_max; 2307 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2308 if (!newpsl) { 2309 err = -ENOBUFS; 2310 goto done; 2311 } 2312 newpsl->sl_max = count; 2313 newpsl->sl_count = count - IP_SFBLOCK; 2314 if (psl) { 2315 for (i = 0; i < psl->sl_count; i++) 2316 newpsl->sl_addr[i] = psl->sl_addr[i]; 2317 /* decrease mem now to avoid the memleak warning */ 2318 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2319 kfree_rcu(psl, rcu); 2320 } 2321 rcu_assign_pointer(pmc->sflist, newpsl); 2322 psl = newpsl; 2323 } 2324 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2325 for (i = 0; i < psl->sl_count; i++) { 2326 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2327 sizeof(__be32)); 2328 if (rv == 0) 2329 break; 2330 } 2331 if (rv == 0) /* address already there is an error */ 2332 goto done; 2333 for (j = psl->sl_count-1; j >= i; j--) 2334 psl->sl_addr[j+1] = psl->sl_addr[j]; 2335 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2336 psl->sl_count++; 2337 err = 0; 2338 /* update the interface list */ 2339 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2340 &mreqs->imr_sourceaddr, 1); 2341 done: 2342 if (leavegroup) 2343 err = ip_mc_leave_group(sk, &imr); 2344 return err; 2345 } 2346 2347 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2348 { 2349 int err = 0; 2350 struct ip_mreqn imr; 2351 __be32 addr = msf->imsf_multiaddr; 2352 struct ip_mc_socklist *pmc; 2353 struct in_device *in_dev; 2354 struct inet_sock *inet = inet_sk(sk); 2355 struct ip_sf_socklist *newpsl, *psl; 2356 struct net *net = sock_net(sk); 2357 int leavegroup = 0; 2358 2359 if (!ipv4_is_multicast(addr)) 2360 return -EINVAL; 2361 if (msf->imsf_fmode != MCAST_INCLUDE && 2362 msf->imsf_fmode != MCAST_EXCLUDE) 2363 return -EINVAL; 2364 2365 ASSERT_RTNL(); 2366 2367 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2368 imr.imr_address.s_addr = msf->imsf_interface; 2369 imr.imr_ifindex = ifindex; 2370 in_dev = ip_mc_find_dev(net, &imr); 2371 2372 if (!in_dev) { 2373 err = -ENODEV; 2374 goto done; 2375 } 2376 2377 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2378 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2379 leavegroup = 1; 2380 goto done; 2381 } 2382 2383 for_each_pmc_rtnl(inet, pmc) { 2384 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2385 pmc->multi.imr_ifindex == imr.imr_ifindex) 2386 break; 2387 } 2388 if (!pmc) { /* must have a prior join */ 2389 err = -EINVAL; 2390 goto done; 2391 } 2392 if (msf->imsf_numsrc) { 2393 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2394 GFP_KERNEL); 2395 if (!newpsl) { 2396 err = -ENOBUFS; 2397 goto done; 2398 } 2399 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2400 memcpy(newpsl->sl_addr, msf->imsf_slist, 2401 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2402 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2403 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2404 if (err) { 2405 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2406 goto done; 2407 } 2408 } else { 2409 newpsl = NULL; 2410 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2411 msf->imsf_fmode, 0, NULL, 0); 2412 } 2413 psl = rtnl_dereference(pmc->sflist); 2414 if (psl) { 2415 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2416 psl->sl_count, psl->sl_addr, 0); 2417 /* decrease mem now to avoid the memleak warning */ 2418 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2419 kfree_rcu(psl, rcu); 2420 } else 2421 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2422 0, NULL, 0); 2423 rcu_assign_pointer(pmc->sflist, newpsl); 2424 pmc->sfmode = msf->imsf_fmode; 2425 err = 0; 2426 done: 2427 if (leavegroup) 2428 err = ip_mc_leave_group(sk, &imr); 2429 return err; 2430 } 2431 2432 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2433 struct ip_msfilter __user *optval, int __user *optlen) 2434 { 2435 int err, len, count, copycount; 2436 struct ip_mreqn imr; 2437 __be32 addr = msf->imsf_multiaddr; 2438 struct ip_mc_socklist *pmc; 2439 struct in_device *in_dev; 2440 struct inet_sock *inet = inet_sk(sk); 2441 struct ip_sf_socklist *psl; 2442 struct net *net = sock_net(sk); 2443 2444 ASSERT_RTNL(); 2445 2446 if (!ipv4_is_multicast(addr)) 2447 return -EINVAL; 2448 2449 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2450 imr.imr_address.s_addr = msf->imsf_interface; 2451 imr.imr_ifindex = 0; 2452 in_dev = ip_mc_find_dev(net, &imr); 2453 2454 if (!in_dev) { 2455 err = -ENODEV; 2456 goto done; 2457 } 2458 err = -EADDRNOTAVAIL; 2459 2460 for_each_pmc_rtnl(inet, pmc) { 2461 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2462 pmc->multi.imr_ifindex == imr.imr_ifindex) 2463 break; 2464 } 2465 if (!pmc) /* must have a prior join */ 2466 goto done; 2467 msf->imsf_fmode = pmc->sfmode; 2468 psl = rtnl_dereference(pmc->sflist); 2469 if (!psl) { 2470 len = 0; 2471 count = 0; 2472 } else { 2473 count = psl->sl_count; 2474 } 2475 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2476 len = copycount * sizeof(psl->sl_addr[0]); 2477 msf->imsf_numsrc = count; 2478 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2479 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2480 return -EFAULT; 2481 } 2482 if (len && 2483 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2484 return -EFAULT; 2485 return 0; 2486 done: 2487 return err; 2488 } 2489 2490 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2491 struct group_filter __user *optval, int __user *optlen) 2492 { 2493 int err, i, count, copycount; 2494 struct sockaddr_in *psin; 2495 __be32 addr; 2496 struct ip_mc_socklist *pmc; 2497 struct inet_sock *inet = inet_sk(sk); 2498 struct ip_sf_socklist *psl; 2499 2500 ASSERT_RTNL(); 2501 2502 psin = (struct sockaddr_in *)&gsf->gf_group; 2503 if (psin->sin_family != AF_INET) 2504 return -EINVAL; 2505 addr = psin->sin_addr.s_addr; 2506 if (!ipv4_is_multicast(addr)) 2507 return -EINVAL; 2508 2509 err = -EADDRNOTAVAIL; 2510 2511 for_each_pmc_rtnl(inet, pmc) { 2512 if (pmc->multi.imr_multiaddr.s_addr == addr && 2513 pmc->multi.imr_ifindex == gsf->gf_interface) 2514 break; 2515 } 2516 if (!pmc) /* must have a prior join */ 2517 goto done; 2518 gsf->gf_fmode = pmc->sfmode; 2519 psl = rtnl_dereference(pmc->sflist); 2520 count = psl ? psl->sl_count : 0; 2521 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2522 gsf->gf_numsrc = count; 2523 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2524 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2525 return -EFAULT; 2526 } 2527 for (i = 0; i < copycount; i++) { 2528 struct sockaddr_storage ss; 2529 2530 psin = (struct sockaddr_in *)&ss; 2531 memset(&ss, 0, sizeof(ss)); 2532 psin->sin_family = AF_INET; 2533 psin->sin_addr.s_addr = psl->sl_addr[i]; 2534 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2535 return -EFAULT; 2536 } 2537 return 0; 2538 done: 2539 return err; 2540 } 2541 2542 /* 2543 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2544 */ 2545 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2546 { 2547 struct inet_sock *inet = inet_sk(sk); 2548 struct ip_mc_socklist *pmc; 2549 struct ip_sf_socklist *psl; 2550 int i; 2551 int ret; 2552 2553 ret = 1; 2554 if (!ipv4_is_multicast(loc_addr)) 2555 goto out; 2556 2557 rcu_read_lock(); 2558 for_each_pmc_rcu(inet, pmc) { 2559 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2560 pmc->multi.imr_ifindex == dif) 2561 break; 2562 } 2563 ret = inet->mc_all; 2564 if (!pmc) 2565 goto unlock; 2566 psl = rcu_dereference(pmc->sflist); 2567 ret = (pmc->sfmode == MCAST_EXCLUDE); 2568 if (!psl) 2569 goto unlock; 2570 2571 for (i = 0; i < psl->sl_count; i++) { 2572 if (psl->sl_addr[i] == rmt_addr) 2573 break; 2574 } 2575 ret = 0; 2576 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2577 goto unlock; 2578 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2579 goto unlock; 2580 ret = 1; 2581 unlock: 2582 rcu_read_unlock(); 2583 out: 2584 return ret; 2585 } 2586 2587 /* 2588 * A socket is closing. 2589 */ 2590 2591 void ip_mc_drop_socket(struct sock *sk) 2592 { 2593 struct inet_sock *inet = inet_sk(sk); 2594 struct ip_mc_socklist *iml; 2595 struct net *net = sock_net(sk); 2596 2597 if (!inet->mc_list) 2598 return; 2599 2600 rtnl_lock(); 2601 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2602 struct in_device *in_dev; 2603 2604 inet->mc_list = iml->next_rcu; 2605 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2606 (void) ip_mc_leave_src(sk, iml, in_dev); 2607 if (in_dev) 2608 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2609 /* decrease mem now to avoid the memleak warning */ 2610 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2611 kfree_rcu(iml, rcu); 2612 } 2613 rtnl_unlock(); 2614 } 2615 2616 /* called with rcu_read_lock() */ 2617 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) 2618 { 2619 struct ip_mc_list *im; 2620 struct ip_mc_list __rcu **mc_hash; 2621 struct ip_sf_list *psf; 2622 int rv = 0; 2623 2624 mc_hash = rcu_dereference(in_dev->mc_hash); 2625 if (mc_hash) { 2626 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2627 2628 for (im = rcu_dereference(mc_hash[hash]); 2629 im != NULL; 2630 im = rcu_dereference(im->next_hash)) { 2631 if (im->multiaddr == mc_addr) 2632 break; 2633 } 2634 } else { 2635 for_each_pmc_rcu(in_dev, im) { 2636 if (im->multiaddr == mc_addr) 2637 break; 2638 } 2639 } 2640 if (im && proto == IPPROTO_IGMP) { 2641 rv = 1; 2642 } else if (im) { 2643 if (src_addr) { 2644 for (psf = im->sources; psf; psf = psf->sf_next) { 2645 if (psf->sf_inaddr == src_addr) 2646 break; 2647 } 2648 if (psf) 2649 rv = psf->sf_count[MCAST_INCLUDE] || 2650 psf->sf_count[MCAST_EXCLUDE] != 2651 im->sfcount[MCAST_EXCLUDE]; 2652 else 2653 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2654 } else 2655 rv = 1; /* unspecified source; tentatively allow */ 2656 } 2657 return rv; 2658 } 2659 2660 #if defined(CONFIG_PROC_FS) 2661 struct igmp_mc_iter_state { 2662 struct seq_net_private p; 2663 struct net_device *dev; 2664 struct in_device *in_dev; 2665 }; 2666 2667 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2668 2669 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2670 { 2671 struct net *net = seq_file_net(seq); 2672 struct ip_mc_list *im = NULL; 2673 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2674 2675 state->in_dev = NULL; 2676 for_each_netdev_rcu(net, state->dev) { 2677 struct in_device *in_dev; 2678 2679 in_dev = __in_dev_get_rcu(state->dev); 2680 if (!in_dev) 2681 continue; 2682 im = rcu_dereference(in_dev->mc_list); 2683 if (im) { 2684 state->in_dev = in_dev; 2685 break; 2686 } 2687 } 2688 return im; 2689 } 2690 2691 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2692 { 2693 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2694 2695 im = rcu_dereference(im->next_rcu); 2696 while (!im) { 2697 state->dev = next_net_device_rcu(state->dev); 2698 if (!state->dev) { 2699 state->in_dev = NULL; 2700 break; 2701 } 2702 state->in_dev = __in_dev_get_rcu(state->dev); 2703 if (!state->in_dev) 2704 continue; 2705 im = rcu_dereference(state->in_dev->mc_list); 2706 } 2707 return im; 2708 } 2709 2710 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2711 { 2712 struct ip_mc_list *im = igmp_mc_get_first(seq); 2713 if (im) 2714 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2715 --pos; 2716 return pos ? NULL : im; 2717 } 2718 2719 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2720 __acquires(rcu) 2721 { 2722 rcu_read_lock(); 2723 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2724 } 2725 2726 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2727 { 2728 struct ip_mc_list *im; 2729 if (v == SEQ_START_TOKEN) 2730 im = igmp_mc_get_first(seq); 2731 else 2732 im = igmp_mc_get_next(seq, v); 2733 ++*pos; 2734 return im; 2735 } 2736 2737 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2738 __releases(rcu) 2739 { 2740 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2741 2742 state->in_dev = NULL; 2743 state->dev = NULL; 2744 rcu_read_unlock(); 2745 } 2746 2747 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2748 { 2749 if (v == SEQ_START_TOKEN) 2750 seq_puts(seq, 2751 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2752 else { 2753 struct ip_mc_list *im = (struct ip_mc_list *)v; 2754 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2755 char *querier; 2756 long delta; 2757 2758 #ifdef CONFIG_IP_MULTICAST 2759 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2760 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2761 "V3"; 2762 #else 2763 querier = "NONE"; 2764 #endif 2765 2766 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2767 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2768 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2769 } 2770 2771 delta = im->timer.expires - jiffies; 2772 seq_printf(seq, 2773 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2774 im->multiaddr, im->users, 2775 im->tm_running, 2776 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2777 im->reporter); 2778 } 2779 return 0; 2780 } 2781 2782 static const struct seq_operations igmp_mc_seq_ops = { 2783 .start = igmp_mc_seq_start, 2784 .next = igmp_mc_seq_next, 2785 .stop = igmp_mc_seq_stop, 2786 .show = igmp_mc_seq_show, 2787 }; 2788 2789 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2790 { 2791 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2792 sizeof(struct igmp_mc_iter_state)); 2793 } 2794 2795 static const struct file_operations igmp_mc_seq_fops = { 2796 .owner = THIS_MODULE, 2797 .open = igmp_mc_seq_open, 2798 .read = seq_read, 2799 .llseek = seq_lseek, 2800 .release = seq_release_net, 2801 }; 2802 2803 struct igmp_mcf_iter_state { 2804 struct seq_net_private p; 2805 struct net_device *dev; 2806 struct in_device *idev; 2807 struct ip_mc_list *im; 2808 }; 2809 2810 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2811 2812 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2813 { 2814 struct net *net = seq_file_net(seq); 2815 struct ip_sf_list *psf = NULL; 2816 struct ip_mc_list *im = NULL; 2817 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2818 2819 state->idev = NULL; 2820 state->im = NULL; 2821 for_each_netdev_rcu(net, state->dev) { 2822 struct in_device *idev; 2823 idev = __in_dev_get_rcu(state->dev); 2824 if (unlikely(!idev)) 2825 continue; 2826 im = rcu_dereference(idev->mc_list); 2827 if (likely(im)) { 2828 spin_lock_bh(&im->lock); 2829 psf = im->sources; 2830 if (likely(psf)) { 2831 state->im = im; 2832 state->idev = idev; 2833 break; 2834 } 2835 spin_unlock_bh(&im->lock); 2836 } 2837 } 2838 return psf; 2839 } 2840 2841 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2842 { 2843 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2844 2845 psf = psf->sf_next; 2846 while (!psf) { 2847 spin_unlock_bh(&state->im->lock); 2848 state->im = state->im->next; 2849 while (!state->im) { 2850 state->dev = next_net_device_rcu(state->dev); 2851 if (!state->dev) { 2852 state->idev = NULL; 2853 goto out; 2854 } 2855 state->idev = __in_dev_get_rcu(state->dev); 2856 if (!state->idev) 2857 continue; 2858 state->im = rcu_dereference(state->idev->mc_list); 2859 } 2860 if (!state->im) 2861 break; 2862 spin_lock_bh(&state->im->lock); 2863 psf = state->im->sources; 2864 } 2865 out: 2866 return psf; 2867 } 2868 2869 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2870 { 2871 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2872 if (psf) 2873 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2874 --pos; 2875 return pos ? NULL : psf; 2876 } 2877 2878 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2879 __acquires(rcu) 2880 { 2881 rcu_read_lock(); 2882 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2883 } 2884 2885 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2886 { 2887 struct ip_sf_list *psf; 2888 if (v == SEQ_START_TOKEN) 2889 psf = igmp_mcf_get_first(seq); 2890 else 2891 psf = igmp_mcf_get_next(seq, v); 2892 ++*pos; 2893 return psf; 2894 } 2895 2896 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2897 __releases(rcu) 2898 { 2899 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2900 if (likely(state->im)) { 2901 spin_unlock_bh(&state->im->lock); 2902 state->im = NULL; 2903 } 2904 state->idev = NULL; 2905 state->dev = NULL; 2906 rcu_read_unlock(); 2907 } 2908 2909 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2910 { 2911 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2912 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2913 2914 if (v == SEQ_START_TOKEN) { 2915 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2916 } else { 2917 seq_printf(seq, 2918 "%3d %6.6s 0x%08x " 2919 "0x%08x %6lu %6lu\n", 2920 state->dev->ifindex, state->dev->name, 2921 ntohl(state->im->multiaddr), 2922 ntohl(psf->sf_inaddr), 2923 psf->sf_count[MCAST_INCLUDE], 2924 psf->sf_count[MCAST_EXCLUDE]); 2925 } 2926 return 0; 2927 } 2928 2929 static const struct seq_operations igmp_mcf_seq_ops = { 2930 .start = igmp_mcf_seq_start, 2931 .next = igmp_mcf_seq_next, 2932 .stop = igmp_mcf_seq_stop, 2933 .show = igmp_mcf_seq_show, 2934 }; 2935 2936 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2937 { 2938 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2939 sizeof(struct igmp_mcf_iter_state)); 2940 } 2941 2942 static const struct file_operations igmp_mcf_seq_fops = { 2943 .owner = THIS_MODULE, 2944 .open = igmp_mcf_seq_open, 2945 .read = seq_read, 2946 .llseek = seq_lseek, 2947 .release = seq_release_net, 2948 }; 2949 2950 static int __net_init igmp_net_init(struct net *net) 2951 { 2952 struct proc_dir_entry *pde; 2953 int err; 2954 2955 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); 2956 if (!pde) 2957 goto out_igmp; 2958 pde = proc_create("mcfilter", S_IRUGO, net->proc_net, 2959 &igmp_mcf_seq_fops); 2960 if (!pde) 2961 goto out_mcfilter; 2962 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, 2963 SOCK_DGRAM, 0, net); 2964 if (err < 0) { 2965 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", 2966 err); 2967 goto out_sock; 2968 } 2969 2970 /* Sysctl initialization */ 2971 net->ipv4.sysctl_igmp_max_memberships = 20; 2972 net->ipv4.sysctl_igmp_max_msf = 10; 2973 /* IGMP reports for link-local multicast groups are enabled by default */ 2974 net->ipv4.sysctl_igmp_llm_reports = 1; 2975 net->ipv4.sysctl_igmp_qrv = 2; 2976 return 0; 2977 2978 out_sock: 2979 remove_proc_entry("mcfilter", net->proc_net); 2980 out_mcfilter: 2981 remove_proc_entry("igmp", net->proc_net); 2982 out_igmp: 2983 return -ENOMEM; 2984 } 2985 2986 static void __net_exit igmp_net_exit(struct net *net) 2987 { 2988 remove_proc_entry("mcfilter", net->proc_net); 2989 remove_proc_entry("igmp", net->proc_net); 2990 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); 2991 } 2992 2993 static struct pernet_operations igmp_net_ops = { 2994 .init = igmp_net_init, 2995 .exit = igmp_net_exit, 2996 }; 2997 #endif 2998 2999 static int igmp_netdev_event(struct notifier_block *this, 3000 unsigned long event, void *ptr) 3001 { 3002 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3003 struct in_device *in_dev; 3004 3005 switch (event) { 3006 case NETDEV_RESEND_IGMP: 3007 in_dev = __in_dev_get_rtnl(dev); 3008 if (in_dev) 3009 ip_mc_rejoin_groups(in_dev); 3010 break; 3011 default: 3012 break; 3013 } 3014 return NOTIFY_DONE; 3015 } 3016 3017 static struct notifier_block igmp_notifier = { 3018 .notifier_call = igmp_netdev_event, 3019 }; 3020 3021 int __init igmp_mc_init(void) 3022 { 3023 #if defined(CONFIG_PROC_FS) 3024 int err; 3025 3026 err = register_pernet_subsys(&igmp_net_ops); 3027 if (err) 3028 return err; 3029 err = register_netdevice_notifier(&igmp_notifier); 3030 if (err) 3031 goto reg_notif_fail; 3032 return 0; 3033 3034 reg_notif_fail: 3035 unregister_pernet_subsys(&igmp_net_ops); 3036 return err; 3037 #else 3038 return register_netdevice_notifier(&igmp_notifier); 3039 #endif 3040 } 3041