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 kfree(pmc); 1176 } 1177 spin_unlock_bh(&im->lock); 1178 } 1179 1180 /* 1181 * flush ip_mc_list deleted records 1182 */ 1183 static void igmpv3_clear_delrec(struct in_device *in_dev) 1184 { 1185 struct ip_mc_list *pmc, *nextpmc; 1186 1187 spin_lock_bh(&in_dev->mc_tomb_lock); 1188 pmc = in_dev->mc_tomb; 1189 in_dev->mc_tomb = NULL; 1190 spin_unlock_bh(&in_dev->mc_tomb_lock); 1191 1192 for (; pmc; pmc = nextpmc) { 1193 nextpmc = pmc->next; 1194 ip_mc_clear_src(pmc); 1195 in_dev_put(pmc->interface); 1196 kfree(pmc); 1197 } 1198 /* clear dead sources, too */ 1199 rcu_read_lock(); 1200 for_each_pmc_rcu(in_dev, pmc) { 1201 struct ip_sf_list *psf, *psf_next; 1202 1203 spin_lock_bh(&pmc->lock); 1204 psf = pmc->tomb; 1205 pmc->tomb = NULL; 1206 spin_unlock_bh(&pmc->lock); 1207 for (; psf; psf = psf_next) { 1208 psf_next = psf->sf_next; 1209 kfree(psf); 1210 } 1211 } 1212 rcu_read_unlock(); 1213 } 1214 #endif 1215 1216 static void igmp_group_dropped(struct ip_mc_list *im) 1217 { 1218 struct in_device *in_dev = im->interface; 1219 #ifdef CONFIG_IP_MULTICAST 1220 struct net *net = dev_net(in_dev->dev); 1221 int reporter; 1222 #endif 1223 1224 if (im->loaded) { 1225 im->loaded = 0; 1226 ip_mc_filter_del(in_dev, im->multiaddr); 1227 } 1228 1229 #ifdef CONFIG_IP_MULTICAST 1230 if (im->multiaddr == IGMP_ALL_HOSTS) 1231 return; 1232 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1233 return; 1234 1235 reporter = im->reporter; 1236 igmp_stop_timer(im); 1237 1238 if (!in_dev->dead) { 1239 if (IGMP_V1_SEEN(in_dev)) 1240 return; 1241 if (IGMP_V2_SEEN(in_dev)) { 1242 if (reporter) 1243 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1244 return; 1245 } 1246 /* IGMPv3 */ 1247 igmpv3_add_delrec(in_dev, im); 1248 1249 igmp_ifc_event(in_dev); 1250 } 1251 #endif 1252 } 1253 1254 static void igmp_group_added(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 #endif 1260 1261 if (im->loaded == 0) { 1262 im->loaded = 1; 1263 ip_mc_filter_add(in_dev, im->multiaddr); 1264 } 1265 1266 #ifdef CONFIG_IP_MULTICAST 1267 if (im->multiaddr == IGMP_ALL_HOSTS) 1268 return; 1269 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1270 return; 1271 1272 if (in_dev->dead) 1273 return; 1274 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1275 spin_lock_bh(&im->lock); 1276 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1277 spin_unlock_bh(&im->lock); 1278 return; 1279 } 1280 /* else, v3 */ 1281 1282 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1283 igmp_ifc_event(in_dev); 1284 #endif 1285 } 1286 1287 1288 /* 1289 * Multicast list managers 1290 */ 1291 1292 static u32 ip_mc_hash(const struct ip_mc_list *im) 1293 { 1294 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1295 } 1296 1297 static void ip_mc_hash_add(struct in_device *in_dev, 1298 struct ip_mc_list *im) 1299 { 1300 struct ip_mc_list __rcu **mc_hash; 1301 u32 hash; 1302 1303 mc_hash = rtnl_dereference(in_dev->mc_hash); 1304 if (mc_hash) { 1305 hash = ip_mc_hash(im); 1306 im->next_hash = mc_hash[hash]; 1307 rcu_assign_pointer(mc_hash[hash], im); 1308 return; 1309 } 1310 1311 /* do not use a hash table for small number of items */ 1312 if (in_dev->mc_count < 4) 1313 return; 1314 1315 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1316 GFP_KERNEL); 1317 if (!mc_hash) 1318 return; 1319 1320 for_each_pmc_rtnl(in_dev, im) { 1321 hash = ip_mc_hash(im); 1322 im->next_hash = mc_hash[hash]; 1323 RCU_INIT_POINTER(mc_hash[hash], im); 1324 } 1325 1326 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1327 } 1328 1329 static void ip_mc_hash_remove(struct in_device *in_dev, 1330 struct ip_mc_list *im) 1331 { 1332 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1333 struct ip_mc_list *aux; 1334 1335 if (!mc_hash) 1336 return; 1337 mc_hash += ip_mc_hash(im); 1338 while ((aux = rtnl_dereference(*mc_hash)) != im) 1339 mc_hash = &aux->next_hash; 1340 *mc_hash = im->next_hash; 1341 } 1342 1343 1344 /* 1345 * A socket has joined a multicast group on device dev. 1346 */ 1347 1348 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1349 { 1350 struct ip_mc_list *im; 1351 #ifdef CONFIG_IP_MULTICAST 1352 struct net *net = dev_net(in_dev->dev); 1353 #endif 1354 1355 ASSERT_RTNL(); 1356 1357 for_each_pmc_rtnl(in_dev, im) { 1358 if (im->multiaddr == addr) { 1359 im->users++; 1360 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1361 goto out; 1362 } 1363 } 1364 1365 im = kzalloc(sizeof(*im), GFP_KERNEL); 1366 if (!im) 1367 goto out; 1368 1369 im->users = 1; 1370 im->interface = in_dev; 1371 in_dev_hold(in_dev); 1372 im->multiaddr = addr; 1373 /* initial mode is (EX, empty) */ 1374 im->sfmode = MCAST_EXCLUDE; 1375 im->sfcount[MCAST_EXCLUDE] = 1; 1376 atomic_set(&im->refcnt, 1); 1377 spin_lock_init(&im->lock); 1378 #ifdef CONFIG_IP_MULTICAST 1379 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); 1380 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; 1381 #endif 1382 1383 im->next_rcu = in_dev->mc_list; 1384 in_dev->mc_count++; 1385 rcu_assign_pointer(in_dev->mc_list, im); 1386 1387 ip_mc_hash_add(in_dev, im); 1388 1389 #ifdef CONFIG_IP_MULTICAST 1390 igmpv3_del_delrec(in_dev, im); 1391 #endif 1392 igmp_group_added(im); 1393 if (!in_dev->dead) 1394 ip_rt_multicast_event(in_dev); 1395 out: 1396 return; 1397 } 1398 EXPORT_SYMBOL(ip_mc_inc_group); 1399 1400 static int ip_mc_check_iphdr(struct sk_buff *skb) 1401 { 1402 const struct iphdr *iph; 1403 unsigned int len; 1404 unsigned int offset = skb_network_offset(skb) + sizeof(*iph); 1405 1406 if (!pskb_may_pull(skb, offset)) 1407 return -EINVAL; 1408 1409 iph = ip_hdr(skb); 1410 1411 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) 1412 return -EINVAL; 1413 1414 offset += ip_hdrlen(skb) - sizeof(*iph); 1415 1416 if (!pskb_may_pull(skb, offset)) 1417 return -EINVAL; 1418 1419 iph = ip_hdr(skb); 1420 1421 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1422 return -EINVAL; 1423 1424 len = skb_network_offset(skb) + ntohs(iph->tot_len); 1425 if (skb->len < len || len < offset) 1426 return -EINVAL; 1427 1428 skb_set_transport_header(skb, offset); 1429 1430 return 0; 1431 } 1432 1433 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) 1434 { 1435 unsigned int len = skb_transport_offset(skb); 1436 1437 len += sizeof(struct igmpv3_report); 1438 1439 return pskb_may_pull(skb, len) ? 0 : -EINVAL; 1440 } 1441 1442 static int ip_mc_check_igmp_query(struct sk_buff *skb) 1443 { 1444 unsigned int len = skb_transport_offset(skb); 1445 1446 len += sizeof(struct igmphdr); 1447 if (skb->len < len) 1448 return -EINVAL; 1449 1450 /* IGMPv{1,2}? */ 1451 if (skb->len != len) { 1452 /* or IGMPv3? */ 1453 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); 1454 if (skb->len < len || !pskb_may_pull(skb, len)) 1455 return -EINVAL; 1456 } 1457 1458 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1459 * all-systems destination addresses (224.0.0.1) for general queries 1460 */ 1461 if (!igmp_hdr(skb)->group && 1462 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) 1463 return -EINVAL; 1464 1465 return 0; 1466 } 1467 1468 static int ip_mc_check_igmp_msg(struct sk_buff *skb) 1469 { 1470 switch (igmp_hdr(skb)->type) { 1471 case IGMP_HOST_LEAVE_MESSAGE: 1472 case IGMP_HOST_MEMBERSHIP_REPORT: 1473 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1474 /* fall through */ 1475 return 0; 1476 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1477 return ip_mc_check_igmp_reportv3(skb); 1478 case IGMP_HOST_MEMBERSHIP_QUERY: 1479 return ip_mc_check_igmp_query(skb); 1480 default: 1481 return -ENOMSG; 1482 } 1483 } 1484 1485 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) 1486 { 1487 return skb_checksum_simple_validate(skb); 1488 } 1489 1490 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1491 1492 { 1493 struct sk_buff *skb_chk; 1494 unsigned int transport_len; 1495 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); 1496 int ret = -EINVAL; 1497 1498 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 1499 1500 skb_chk = skb_checksum_trimmed(skb, transport_len, 1501 ip_mc_validate_checksum); 1502 if (!skb_chk) 1503 goto err; 1504 1505 if (!pskb_may_pull(skb_chk, len)) 1506 goto err; 1507 1508 ret = ip_mc_check_igmp_msg(skb_chk); 1509 if (ret) 1510 goto err; 1511 1512 if (skb_trimmed) 1513 *skb_trimmed = skb_chk; 1514 /* free now unneeded clone */ 1515 else if (skb_chk != skb) 1516 kfree_skb(skb_chk); 1517 1518 ret = 0; 1519 1520 err: 1521 if (ret && skb_chk && skb_chk != skb) 1522 kfree_skb(skb_chk); 1523 1524 return ret; 1525 } 1526 1527 /** 1528 * ip_mc_check_igmp - checks whether this is a sane IGMP packet 1529 * @skb: the skb to validate 1530 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) 1531 * 1532 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets 1533 * skb transport header accordingly and returns zero. 1534 * 1535 * -EINVAL: A broken packet was detected, i.e. it violates some internet 1536 * standard 1537 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. 1538 * -ENOMEM: A memory allocation failure happened. 1539 * 1540 * Optionally, an skb pointer might be provided via skb_trimmed (or set it 1541 * to NULL): After parsing an IGMP packet successfully it will point to 1542 * an skb which has its tail aligned to the IP packet end. This might 1543 * either be the originally provided skb or a trimmed, cloned version if 1544 * the skb frame had data beyond the IP packet. A cloned skb allows us 1545 * to leave the original skb and its full frame unchanged (which might be 1546 * desirable for layer 2 frame jugglers). 1547 * 1548 * Caller needs to set the skb network header and free any returned skb if it 1549 * differs from the provided skb. 1550 */ 1551 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1552 { 1553 int ret = ip_mc_check_iphdr(skb); 1554 1555 if (ret < 0) 1556 return ret; 1557 1558 if (ip_hdr(skb)->protocol != IPPROTO_IGMP) 1559 return -ENOMSG; 1560 1561 return __ip_mc_check_igmp(skb, skb_trimmed); 1562 } 1563 EXPORT_SYMBOL(ip_mc_check_igmp); 1564 1565 /* 1566 * Resend IGMP JOIN report; used by netdev notifier. 1567 */ 1568 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1569 { 1570 #ifdef CONFIG_IP_MULTICAST 1571 struct ip_mc_list *im; 1572 int type; 1573 struct net *net = dev_net(in_dev->dev); 1574 1575 ASSERT_RTNL(); 1576 1577 for_each_pmc_rtnl(in_dev, im) { 1578 if (im->multiaddr == IGMP_ALL_HOSTS) 1579 continue; 1580 if (ipv4_is_local_multicast(im->multiaddr) && 1581 !net->ipv4.sysctl_igmp_llm_reports) 1582 continue; 1583 1584 /* a failover is happening and switches 1585 * must be notified immediately 1586 */ 1587 if (IGMP_V1_SEEN(in_dev)) 1588 type = IGMP_HOST_MEMBERSHIP_REPORT; 1589 else if (IGMP_V2_SEEN(in_dev)) 1590 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1591 else 1592 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1593 igmp_send_report(in_dev, im, type); 1594 } 1595 #endif 1596 } 1597 1598 /* 1599 * A socket has left a multicast group on device dev 1600 */ 1601 1602 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1603 { 1604 struct ip_mc_list *i; 1605 struct ip_mc_list __rcu **ip; 1606 1607 ASSERT_RTNL(); 1608 1609 for (ip = &in_dev->mc_list; 1610 (i = rtnl_dereference(*ip)) != NULL; 1611 ip = &i->next_rcu) { 1612 if (i->multiaddr == addr) { 1613 if (--i->users == 0) { 1614 ip_mc_hash_remove(in_dev, i); 1615 *ip = i->next_rcu; 1616 in_dev->mc_count--; 1617 igmp_group_dropped(i); 1618 ip_mc_clear_src(i); 1619 1620 if (!in_dev->dead) 1621 ip_rt_multicast_event(in_dev); 1622 1623 ip_ma_put(i); 1624 return; 1625 } 1626 break; 1627 } 1628 } 1629 } 1630 EXPORT_SYMBOL(ip_mc_dec_group); 1631 1632 /* Device changing type */ 1633 1634 void ip_mc_unmap(struct in_device *in_dev) 1635 { 1636 struct ip_mc_list *pmc; 1637 1638 ASSERT_RTNL(); 1639 1640 for_each_pmc_rtnl(in_dev, pmc) 1641 igmp_group_dropped(pmc); 1642 } 1643 1644 void ip_mc_remap(struct in_device *in_dev) 1645 { 1646 struct ip_mc_list *pmc; 1647 1648 ASSERT_RTNL(); 1649 1650 for_each_pmc_rtnl(in_dev, pmc) { 1651 #ifdef CONFIG_IP_MULTICAST 1652 igmpv3_del_delrec(in_dev, pmc); 1653 #endif 1654 igmp_group_added(pmc); 1655 } 1656 } 1657 1658 /* Device going down */ 1659 1660 void ip_mc_down(struct in_device *in_dev) 1661 { 1662 struct ip_mc_list *pmc; 1663 1664 ASSERT_RTNL(); 1665 1666 for_each_pmc_rtnl(in_dev, pmc) 1667 igmp_group_dropped(pmc); 1668 1669 #ifdef CONFIG_IP_MULTICAST 1670 in_dev->mr_ifc_count = 0; 1671 if (del_timer(&in_dev->mr_ifc_timer)) 1672 __in_dev_put(in_dev); 1673 in_dev->mr_gq_running = 0; 1674 if (del_timer(&in_dev->mr_gq_timer)) 1675 __in_dev_put(in_dev); 1676 #endif 1677 1678 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1679 } 1680 1681 void ip_mc_init_dev(struct in_device *in_dev) 1682 { 1683 #ifdef CONFIG_IP_MULTICAST 1684 struct net *net = dev_net(in_dev->dev); 1685 #endif 1686 ASSERT_RTNL(); 1687 1688 #ifdef CONFIG_IP_MULTICAST 1689 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1690 (unsigned long)in_dev); 1691 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1692 (unsigned long)in_dev); 1693 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1694 #endif 1695 1696 spin_lock_init(&in_dev->mc_tomb_lock); 1697 } 1698 1699 /* Device going up */ 1700 1701 void ip_mc_up(struct in_device *in_dev) 1702 { 1703 struct ip_mc_list *pmc; 1704 #ifdef CONFIG_IP_MULTICAST 1705 struct net *net = dev_net(in_dev->dev); 1706 #endif 1707 1708 ASSERT_RTNL(); 1709 1710 #ifdef CONFIG_IP_MULTICAST 1711 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1712 #endif 1713 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1714 1715 for_each_pmc_rtnl(in_dev, pmc) { 1716 #ifdef CONFIG_IP_MULTICAST 1717 igmpv3_del_delrec(in_dev, pmc); 1718 #endif 1719 igmp_group_added(pmc); 1720 } 1721 } 1722 1723 /* 1724 * Device is about to be destroyed: clean up. 1725 */ 1726 1727 void ip_mc_destroy_dev(struct in_device *in_dev) 1728 { 1729 struct ip_mc_list *i; 1730 1731 ASSERT_RTNL(); 1732 1733 /* Deactivate timers */ 1734 ip_mc_down(in_dev); 1735 #ifdef CONFIG_IP_MULTICAST 1736 igmpv3_clear_delrec(in_dev); 1737 #endif 1738 1739 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1740 in_dev->mc_list = i->next_rcu; 1741 in_dev->mc_count--; 1742 ip_ma_put(i); 1743 } 1744 } 1745 1746 /* RTNL is locked */ 1747 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1748 { 1749 struct net_device *dev = NULL; 1750 struct in_device *idev = NULL; 1751 1752 if (imr->imr_ifindex) { 1753 idev = inetdev_by_index(net, imr->imr_ifindex); 1754 return idev; 1755 } 1756 if (imr->imr_address.s_addr) { 1757 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1758 if (!dev) 1759 return NULL; 1760 } 1761 1762 if (!dev) { 1763 struct rtable *rt = ip_route_output(net, 1764 imr->imr_multiaddr.s_addr, 1765 0, 0, 0); 1766 if (!IS_ERR(rt)) { 1767 dev = rt->dst.dev; 1768 ip_rt_put(rt); 1769 } 1770 } 1771 if (dev) { 1772 imr->imr_ifindex = dev->ifindex; 1773 idev = __in_dev_get_rtnl(dev); 1774 } 1775 return idev; 1776 } 1777 1778 /* 1779 * Join a socket to a group 1780 */ 1781 1782 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1783 __be32 *psfsrc) 1784 { 1785 struct ip_sf_list *psf, *psf_prev; 1786 int rv = 0; 1787 1788 psf_prev = NULL; 1789 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1790 if (psf->sf_inaddr == *psfsrc) 1791 break; 1792 psf_prev = psf; 1793 } 1794 if (!psf || psf->sf_count[sfmode] == 0) { 1795 /* source filter not found, or count wrong => bug */ 1796 return -ESRCH; 1797 } 1798 psf->sf_count[sfmode]--; 1799 if (psf->sf_count[sfmode] == 0) { 1800 ip_rt_multicast_event(pmc->interface); 1801 } 1802 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1803 #ifdef CONFIG_IP_MULTICAST 1804 struct in_device *in_dev = pmc->interface; 1805 struct net *net = dev_net(in_dev->dev); 1806 #endif 1807 1808 /* no more filters for this source */ 1809 if (psf_prev) 1810 psf_prev->sf_next = psf->sf_next; 1811 else 1812 pmc->sources = psf->sf_next; 1813 #ifdef CONFIG_IP_MULTICAST 1814 if (psf->sf_oldin && 1815 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1816 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1817 psf->sf_next = pmc->tomb; 1818 pmc->tomb = psf; 1819 rv = 1; 1820 } else 1821 #endif 1822 kfree(psf); 1823 } 1824 return rv; 1825 } 1826 1827 #ifndef CONFIG_IP_MULTICAST 1828 #define igmp_ifc_event(x) do { } while (0) 1829 #endif 1830 1831 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1832 int sfcount, __be32 *psfsrc, int delta) 1833 { 1834 struct ip_mc_list *pmc; 1835 int changerec = 0; 1836 int i, err; 1837 1838 if (!in_dev) 1839 return -ENODEV; 1840 rcu_read_lock(); 1841 for_each_pmc_rcu(in_dev, pmc) { 1842 if (*pmca == pmc->multiaddr) 1843 break; 1844 } 1845 if (!pmc) { 1846 /* MCA not found?? bug */ 1847 rcu_read_unlock(); 1848 return -ESRCH; 1849 } 1850 spin_lock_bh(&pmc->lock); 1851 rcu_read_unlock(); 1852 #ifdef CONFIG_IP_MULTICAST 1853 sf_markstate(pmc); 1854 #endif 1855 if (!delta) { 1856 err = -EINVAL; 1857 if (!pmc->sfcount[sfmode]) 1858 goto out_unlock; 1859 pmc->sfcount[sfmode]--; 1860 } 1861 err = 0; 1862 for (i = 0; i < sfcount; i++) { 1863 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1864 1865 changerec |= rv > 0; 1866 if (!err && rv < 0) 1867 err = rv; 1868 } 1869 if (pmc->sfmode == MCAST_EXCLUDE && 1870 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1871 pmc->sfcount[MCAST_INCLUDE]) { 1872 #ifdef CONFIG_IP_MULTICAST 1873 struct ip_sf_list *psf; 1874 struct net *net = dev_net(in_dev->dev); 1875 #endif 1876 1877 /* filter mode change */ 1878 pmc->sfmode = MCAST_INCLUDE; 1879 #ifdef CONFIG_IP_MULTICAST 1880 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1881 in_dev->mr_ifc_count = pmc->crcount; 1882 for (psf = pmc->sources; psf; psf = psf->sf_next) 1883 psf->sf_crcount = 0; 1884 igmp_ifc_event(pmc->interface); 1885 } else if (sf_setstate(pmc) || changerec) { 1886 igmp_ifc_event(pmc->interface); 1887 #endif 1888 } 1889 out_unlock: 1890 spin_unlock_bh(&pmc->lock); 1891 return err; 1892 } 1893 1894 /* 1895 * Add multicast single-source filter to the interface list 1896 */ 1897 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1898 __be32 *psfsrc) 1899 { 1900 struct ip_sf_list *psf, *psf_prev; 1901 1902 psf_prev = NULL; 1903 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1904 if (psf->sf_inaddr == *psfsrc) 1905 break; 1906 psf_prev = psf; 1907 } 1908 if (!psf) { 1909 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1910 if (!psf) 1911 return -ENOBUFS; 1912 psf->sf_inaddr = *psfsrc; 1913 if (psf_prev) { 1914 psf_prev->sf_next = psf; 1915 } else 1916 pmc->sources = psf; 1917 } 1918 psf->sf_count[sfmode]++; 1919 if (psf->sf_count[sfmode] == 1) { 1920 ip_rt_multicast_event(pmc->interface); 1921 } 1922 return 0; 1923 } 1924 1925 #ifdef CONFIG_IP_MULTICAST 1926 static void sf_markstate(struct ip_mc_list *pmc) 1927 { 1928 struct ip_sf_list *psf; 1929 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1930 1931 for (psf = pmc->sources; psf; psf = psf->sf_next) 1932 if (pmc->sfcount[MCAST_EXCLUDE]) { 1933 psf->sf_oldin = mca_xcount == 1934 psf->sf_count[MCAST_EXCLUDE] && 1935 !psf->sf_count[MCAST_INCLUDE]; 1936 } else 1937 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1938 } 1939 1940 static int sf_setstate(struct ip_mc_list *pmc) 1941 { 1942 struct ip_sf_list *psf, *dpsf; 1943 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1944 int qrv = pmc->interface->mr_qrv; 1945 int new_in, rv; 1946 1947 rv = 0; 1948 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1949 if (pmc->sfcount[MCAST_EXCLUDE]) { 1950 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1951 !psf->sf_count[MCAST_INCLUDE]; 1952 } else 1953 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1954 if (new_in) { 1955 if (!psf->sf_oldin) { 1956 struct ip_sf_list *prev = NULL; 1957 1958 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 1959 if (dpsf->sf_inaddr == psf->sf_inaddr) 1960 break; 1961 prev = dpsf; 1962 } 1963 if (dpsf) { 1964 if (prev) 1965 prev->sf_next = dpsf->sf_next; 1966 else 1967 pmc->tomb = dpsf->sf_next; 1968 kfree(dpsf); 1969 } 1970 psf->sf_crcount = qrv; 1971 rv++; 1972 } 1973 } else if (psf->sf_oldin) { 1974 1975 psf->sf_crcount = 0; 1976 /* 1977 * add or update "delete" records if an active filter 1978 * is now inactive 1979 */ 1980 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 1981 if (dpsf->sf_inaddr == psf->sf_inaddr) 1982 break; 1983 if (!dpsf) { 1984 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1985 if (!dpsf) 1986 continue; 1987 *dpsf = *psf; 1988 /* pmc->lock held by callers */ 1989 dpsf->sf_next = pmc->tomb; 1990 pmc->tomb = dpsf; 1991 } 1992 dpsf->sf_crcount = qrv; 1993 rv++; 1994 } 1995 } 1996 return rv; 1997 } 1998 #endif 1999 2000 /* 2001 * Add multicast source filter list to the interface list 2002 */ 2003 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 2004 int sfcount, __be32 *psfsrc, int delta) 2005 { 2006 struct ip_mc_list *pmc; 2007 int isexclude; 2008 int i, err; 2009 2010 if (!in_dev) 2011 return -ENODEV; 2012 rcu_read_lock(); 2013 for_each_pmc_rcu(in_dev, pmc) { 2014 if (*pmca == pmc->multiaddr) 2015 break; 2016 } 2017 if (!pmc) { 2018 /* MCA not found?? bug */ 2019 rcu_read_unlock(); 2020 return -ESRCH; 2021 } 2022 spin_lock_bh(&pmc->lock); 2023 rcu_read_unlock(); 2024 2025 #ifdef CONFIG_IP_MULTICAST 2026 sf_markstate(pmc); 2027 #endif 2028 isexclude = pmc->sfmode == MCAST_EXCLUDE; 2029 if (!delta) 2030 pmc->sfcount[sfmode]++; 2031 err = 0; 2032 for (i = 0; i < sfcount; i++) { 2033 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2034 if (err) 2035 break; 2036 } 2037 if (err) { 2038 int j; 2039 2040 if (!delta) 2041 pmc->sfcount[sfmode]--; 2042 for (j = 0; j < i; j++) 2043 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2044 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 2045 #ifdef CONFIG_IP_MULTICAST 2046 struct ip_sf_list *psf; 2047 struct net *net = dev_net(pmc->interface->dev); 2048 in_dev = pmc->interface; 2049 #endif 2050 2051 /* filter mode change */ 2052 if (pmc->sfcount[MCAST_EXCLUDE]) 2053 pmc->sfmode = MCAST_EXCLUDE; 2054 else if (pmc->sfcount[MCAST_INCLUDE]) 2055 pmc->sfmode = MCAST_INCLUDE; 2056 #ifdef CONFIG_IP_MULTICAST 2057 /* else no filters; keep old mode for reports */ 2058 2059 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 2060 in_dev->mr_ifc_count = pmc->crcount; 2061 for (psf = pmc->sources; psf; psf = psf->sf_next) 2062 psf->sf_crcount = 0; 2063 igmp_ifc_event(in_dev); 2064 } else if (sf_setstate(pmc)) { 2065 igmp_ifc_event(in_dev); 2066 #endif 2067 } 2068 spin_unlock_bh(&pmc->lock); 2069 return err; 2070 } 2071 2072 static void ip_mc_clear_src(struct ip_mc_list *pmc) 2073 { 2074 struct ip_sf_list *psf, *nextpsf; 2075 2076 for (psf = pmc->tomb; psf; psf = nextpsf) { 2077 nextpsf = psf->sf_next; 2078 kfree(psf); 2079 } 2080 pmc->tomb = NULL; 2081 for (psf = pmc->sources; psf; psf = nextpsf) { 2082 nextpsf = psf->sf_next; 2083 kfree(psf); 2084 } 2085 pmc->sources = NULL; 2086 pmc->sfmode = MCAST_EXCLUDE; 2087 pmc->sfcount[MCAST_INCLUDE] = 0; 2088 pmc->sfcount[MCAST_EXCLUDE] = 1; 2089 } 2090 2091 /* Join a multicast group 2092 */ 2093 2094 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) 2095 { 2096 __be32 addr = imr->imr_multiaddr.s_addr; 2097 struct ip_mc_socklist *iml, *i; 2098 struct in_device *in_dev; 2099 struct inet_sock *inet = inet_sk(sk); 2100 struct net *net = sock_net(sk); 2101 int ifindex; 2102 int count = 0; 2103 int err; 2104 2105 ASSERT_RTNL(); 2106 2107 if (!ipv4_is_multicast(addr)) 2108 return -EINVAL; 2109 2110 in_dev = ip_mc_find_dev(net, imr); 2111 2112 if (!in_dev) { 2113 err = -ENODEV; 2114 goto done; 2115 } 2116 2117 err = -EADDRINUSE; 2118 ifindex = imr->imr_ifindex; 2119 for_each_pmc_rtnl(inet, i) { 2120 if (i->multi.imr_multiaddr.s_addr == addr && 2121 i->multi.imr_ifindex == ifindex) 2122 goto done; 2123 count++; 2124 } 2125 err = -ENOBUFS; 2126 if (count >= net->ipv4.sysctl_igmp_max_memberships) 2127 goto done; 2128 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 2129 if (!iml) 2130 goto done; 2131 2132 memcpy(&iml->multi, imr, sizeof(*imr)); 2133 iml->next_rcu = inet->mc_list; 2134 iml->sflist = NULL; 2135 iml->sfmode = MCAST_EXCLUDE; 2136 rcu_assign_pointer(inet->mc_list, iml); 2137 ip_mc_inc_group(in_dev, addr); 2138 err = 0; 2139 done: 2140 return err; 2141 } 2142 EXPORT_SYMBOL(ip_mc_join_group); 2143 2144 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 2145 struct in_device *in_dev) 2146 { 2147 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 2148 int err; 2149 2150 if (!psf) { 2151 /* any-source empty exclude case */ 2152 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2153 iml->sfmode, 0, NULL, 0); 2154 } 2155 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2156 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 2157 RCU_INIT_POINTER(iml->sflist, NULL); 2158 /* decrease mem now to avoid the memleak warning */ 2159 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 2160 kfree_rcu(psf, rcu); 2161 return err; 2162 } 2163 2164 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 2165 { 2166 struct inet_sock *inet = inet_sk(sk); 2167 struct ip_mc_socklist *iml; 2168 struct ip_mc_socklist __rcu **imlp; 2169 struct in_device *in_dev; 2170 struct net *net = sock_net(sk); 2171 __be32 group = imr->imr_multiaddr.s_addr; 2172 u32 ifindex; 2173 int ret = -EADDRNOTAVAIL; 2174 2175 ASSERT_RTNL(); 2176 2177 in_dev = ip_mc_find_dev(net, imr); 2178 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { 2179 ret = -ENODEV; 2180 goto out; 2181 } 2182 ifindex = imr->imr_ifindex; 2183 for (imlp = &inet->mc_list; 2184 (iml = rtnl_dereference(*imlp)) != NULL; 2185 imlp = &iml->next_rcu) { 2186 if (iml->multi.imr_multiaddr.s_addr != group) 2187 continue; 2188 if (ifindex) { 2189 if (iml->multi.imr_ifindex != ifindex) 2190 continue; 2191 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 2192 iml->multi.imr_address.s_addr) 2193 continue; 2194 2195 (void) ip_mc_leave_src(sk, iml, in_dev); 2196 2197 *imlp = iml->next_rcu; 2198 2199 if (in_dev) 2200 ip_mc_dec_group(in_dev, group); 2201 2202 /* decrease mem now to avoid the memleak warning */ 2203 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2204 kfree_rcu(iml, rcu); 2205 return 0; 2206 } 2207 out: 2208 return ret; 2209 } 2210 EXPORT_SYMBOL(ip_mc_leave_group); 2211 2212 int ip_mc_source(int add, int omode, struct sock *sk, struct 2213 ip_mreq_source *mreqs, int ifindex) 2214 { 2215 int err; 2216 struct ip_mreqn imr; 2217 __be32 addr = mreqs->imr_multiaddr; 2218 struct ip_mc_socklist *pmc; 2219 struct in_device *in_dev = NULL; 2220 struct inet_sock *inet = inet_sk(sk); 2221 struct ip_sf_socklist *psl; 2222 struct net *net = sock_net(sk); 2223 int leavegroup = 0; 2224 int i, j, rv; 2225 2226 if (!ipv4_is_multicast(addr)) 2227 return -EINVAL; 2228 2229 ASSERT_RTNL(); 2230 2231 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2232 imr.imr_address.s_addr = mreqs->imr_interface; 2233 imr.imr_ifindex = ifindex; 2234 in_dev = ip_mc_find_dev(net, &imr); 2235 2236 if (!in_dev) { 2237 err = -ENODEV; 2238 goto done; 2239 } 2240 err = -EADDRNOTAVAIL; 2241 2242 for_each_pmc_rtnl(inet, pmc) { 2243 if ((pmc->multi.imr_multiaddr.s_addr == 2244 imr.imr_multiaddr.s_addr) && 2245 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2246 break; 2247 } 2248 if (!pmc) { /* must have a prior join */ 2249 err = -EINVAL; 2250 goto done; 2251 } 2252 /* if a source filter was set, must be the same mode as before */ 2253 if (pmc->sflist) { 2254 if (pmc->sfmode != omode) { 2255 err = -EINVAL; 2256 goto done; 2257 } 2258 } else if (pmc->sfmode != omode) { 2259 /* allow mode switches for empty-set filters */ 2260 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2261 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2262 NULL, 0); 2263 pmc->sfmode = omode; 2264 } 2265 2266 psl = rtnl_dereference(pmc->sflist); 2267 if (!add) { 2268 if (!psl) 2269 goto done; /* err = -EADDRNOTAVAIL */ 2270 rv = !0; 2271 for (i = 0; i < psl->sl_count; i++) { 2272 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2273 sizeof(__be32)); 2274 if (rv == 0) 2275 break; 2276 } 2277 if (rv) /* source not found */ 2278 goto done; /* err = -EADDRNOTAVAIL */ 2279 2280 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2281 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2282 leavegroup = 1; 2283 goto done; 2284 } 2285 2286 /* update the interface filter */ 2287 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2288 &mreqs->imr_sourceaddr, 1); 2289 2290 for (j = i+1; j < psl->sl_count; j++) 2291 psl->sl_addr[j-1] = psl->sl_addr[j]; 2292 psl->sl_count--; 2293 err = 0; 2294 goto done; 2295 } 2296 /* else, add a new source to the filter */ 2297 2298 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { 2299 err = -ENOBUFS; 2300 goto done; 2301 } 2302 if (!psl || psl->sl_count == psl->sl_max) { 2303 struct ip_sf_socklist *newpsl; 2304 int count = IP_SFBLOCK; 2305 2306 if (psl) 2307 count += psl->sl_max; 2308 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2309 if (!newpsl) { 2310 err = -ENOBUFS; 2311 goto done; 2312 } 2313 newpsl->sl_max = count; 2314 newpsl->sl_count = count - IP_SFBLOCK; 2315 if (psl) { 2316 for (i = 0; i < psl->sl_count; i++) 2317 newpsl->sl_addr[i] = psl->sl_addr[i]; 2318 /* decrease mem now to avoid the memleak warning */ 2319 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2320 kfree_rcu(psl, rcu); 2321 } 2322 rcu_assign_pointer(pmc->sflist, newpsl); 2323 psl = newpsl; 2324 } 2325 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2326 for (i = 0; i < psl->sl_count; i++) { 2327 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2328 sizeof(__be32)); 2329 if (rv == 0) 2330 break; 2331 } 2332 if (rv == 0) /* address already there is an error */ 2333 goto done; 2334 for (j = psl->sl_count-1; j >= i; j--) 2335 psl->sl_addr[j+1] = psl->sl_addr[j]; 2336 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2337 psl->sl_count++; 2338 err = 0; 2339 /* update the interface list */ 2340 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2341 &mreqs->imr_sourceaddr, 1); 2342 done: 2343 if (leavegroup) 2344 err = ip_mc_leave_group(sk, &imr); 2345 return err; 2346 } 2347 2348 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2349 { 2350 int err = 0; 2351 struct ip_mreqn imr; 2352 __be32 addr = msf->imsf_multiaddr; 2353 struct ip_mc_socklist *pmc; 2354 struct in_device *in_dev; 2355 struct inet_sock *inet = inet_sk(sk); 2356 struct ip_sf_socklist *newpsl, *psl; 2357 struct net *net = sock_net(sk); 2358 int leavegroup = 0; 2359 2360 if (!ipv4_is_multicast(addr)) 2361 return -EINVAL; 2362 if (msf->imsf_fmode != MCAST_INCLUDE && 2363 msf->imsf_fmode != MCAST_EXCLUDE) 2364 return -EINVAL; 2365 2366 ASSERT_RTNL(); 2367 2368 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2369 imr.imr_address.s_addr = msf->imsf_interface; 2370 imr.imr_ifindex = ifindex; 2371 in_dev = ip_mc_find_dev(net, &imr); 2372 2373 if (!in_dev) { 2374 err = -ENODEV; 2375 goto done; 2376 } 2377 2378 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2379 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2380 leavegroup = 1; 2381 goto done; 2382 } 2383 2384 for_each_pmc_rtnl(inet, pmc) { 2385 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2386 pmc->multi.imr_ifindex == imr.imr_ifindex) 2387 break; 2388 } 2389 if (!pmc) { /* must have a prior join */ 2390 err = -EINVAL; 2391 goto done; 2392 } 2393 if (msf->imsf_numsrc) { 2394 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2395 GFP_KERNEL); 2396 if (!newpsl) { 2397 err = -ENOBUFS; 2398 goto done; 2399 } 2400 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2401 memcpy(newpsl->sl_addr, msf->imsf_slist, 2402 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2403 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2404 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2405 if (err) { 2406 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2407 goto done; 2408 } 2409 } else { 2410 newpsl = NULL; 2411 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2412 msf->imsf_fmode, 0, NULL, 0); 2413 } 2414 psl = rtnl_dereference(pmc->sflist); 2415 if (psl) { 2416 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2417 psl->sl_count, psl->sl_addr, 0); 2418 /* decrease mem now to avoid the memleak warning */ 2419 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2420 kfree_rcu(psl, rcu); 2421 } else 2422 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2423 0, NULL, 0); 2424 rcu_assign_pointer(pmc->sflist, newpsl); 2425 pmc->sfmode = msf->imsf_fmode; 2426 err = 0; 2427 done: 2428 if (leavegroup) 2429 err = ip_mc_leave_group(sk, &imr); 2430 return err; 2431 } 2432 2433 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2434 struct ip_msfilter __user *optval, int __user *optlen) 2435 { 2436 int err, len, count, copycount; 2437 struct ip_mreqn imr; 2438 __be32 addr = msf->imsf_multiaddr; 2439 struct ip_mc_socklist *pmc; 2440 struct in_device *in_dev; 2441 struct inet_sock *inet = inet_sk(sk); 2442 struct ip_sf_socklist *psl; 2443 struct net *net = sock_net(sk); 2444 2445 ASSERT_RTNL(); 2446 2447 if (!ipv4_is_multicast(addr)) 2448 return -EINVAL; 2449 2450 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2451 imr.imr_address.s_addr = msf->imsf_interface; 2452 imr.imr_ifindex = 0; 2453 in_dev = ip_mc_find_dev(net, &imr); 2454 2455 if (!in_dev) { 2456 err = -ENODEV; 2457 goto done; 2458 } 2459 err = -EADDRNOTAVAIL; 2460 2461 for_each_pmc_rtnl(inet, pmc) { 2462 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2463 pmc->multi.imr_ifindex == imr.imr_ifindex) 2464 break; 2465 } 2466 if (!pmc) /* must have a prior join */ 2467 goto done; 2468 msf->imsf_fmode = pmc->sfmode; 2469 psl = rtnl_dereference(pmc->sflist); 2470 if (!psl) { 2471 len = 0; 2472 count = 0; 2473 } else { 2474 count = psl->sl_count; 2475 } 2476 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2477 len = copycount * sizeof(psl->sl_addr[0]); 2478 msf->imsf_numsrc = count; 2479 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2480 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2481 return -EFAULT; 2482 } 2483 if (len && 2484 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2485 return -EFAULT; 2486 return 0; 2487 done: 2488 return err; 2489 } 2490 2491 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2492 struct group_filter __user *optval, int __user *optlen) 2493 { 2494 int err, i, count, copycount; 2495 struct sockaddr_in *psin; 2496 __be32 addr; 2497 struct ip_mc_socklist *pmc; 2498 struct inet_sock *inet = inet_sk(sk); 2499 struct ip_sf_socklist *psl; 2500 2501 ASSERT_RTNL(); 2502 2503 psin = (struct sockaddr_in *)&gsf->gf_group; 2504 if (psin->sin_family != AF_INET) 2505 return -EINVAL; 2506 addr = psin->sin_addr.s_addr; 2507 if (!ipv4_is_multicast(addr)) 2508 return -EINVAL; 2509 2510 err = -EADDRNOTAVAIL; 2511 2512 for_each_pmc_rtnl(inet, pmc) { 2513 if (pmc->multi.imr_multiaddr.s_addr == addr && 2514 pmc->multi.imr_ifindex == gsf->gf_interface) 2515 break; 2516 } 2517 if (!pmc) /* must have a prior join */ 2518 goto done; 2519 gsf->gf_fmode = pmc->sfmode; 2520 psl = rtnl_dereference(pmc->sflist); 2521 count = psl ? psl->sl_count : 0; 2522 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2523 gsf->gf_numsrc = count; 2524 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2525 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2526 return -EFAULT; 2527 } 2528 for (i = 0; i < copycount; i++) { 2529 struct sockaddr_storage ss; 2530 2531 psin = (struct sockaddr_in *)&ss; 2532 memset(&ss, 0, sizeof(ss)); 2533 psin->sin_family = AF_INET; 2534 psin->sin_addr.s_addr = psl->sl_addr[i]; 2535 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2536 return -EFAULT; 2537 } 2538 return 0; 2539 done: 2540 return err; 2541 } 2542 2543 /* 2544 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2545 */ 2546 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2547 { 2548 struct inet_sock *inet = inet_sk(sk); 2549 struct ip_mc_socklist *pmc; 2550 struct ip_sf_socklist *psl; 2551 int i; 2552 int ret; 2553 2554 ret = 1; 2555 if (!ipv4_is_multicast(loc_addr)) 2556 goto out; 2557 2558 rcu_read_lock(); 2559 for_each_pmc_rcu(inet, pmc) { 2560 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2561 pmc->multi.imr_ifindex == dif) 2562 break; 2563 } 2564 ret = inet->mc_all; 2565 if (!pmc) 2566 goto unlock; 2567 psl = rcu_dereference(pmc->sflist); 2568 ret = (pmc->sfmode == MCAST_EXCLUDE); 2569 if (!psl) 2570 goto unlock; 2571 2572 for (i = 0; i < psl->sl_count; i++) { 2573 if (psl->sl_addr[i] == rmt_addr) 2574 break; 2575 } 2576 ret = 0; 2577 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2578 goto unlock; 2579 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2580 goto unlock; 2581 ret = 1; 2582 unlock: 2583 rcu_read_unlock(); 2584 out: 2585 return ret; 2586 } 2587 2588 /* 2589 * A socket is closing. 2590 */ 2591 2592 void ip_mc_drop_socket(struct sock *sk) 2593 { 2594 struct inet_sock *inet = inet_sk(sk); 2595 struct ip_mc_socklist *iml; 2596 struct net *net = sock_net(sk); 2597 2598 if (!inet->mc_list) 2599 return; 2600 2601 rtnl_lock(); 2602 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2603 struct in_device *in_dev; 2604 2605 inet->mc_list = iml->next_rcu; 2606 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2607 (void) ip_mc_leave_src(sk, iml, in_dev); 2608 if (in_dev) 2609 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2610 /* decrease mem now to avoid the memleak warning */ 2611 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2612 kfree_rcu(iml, rcu); 2613 } 2614 rtnl_unlock(); 2615 } 2616 2617 /* called with rcu_read_lock() */ 2618 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) 2619 { 2620 struct ip_mc_list *im; 2621 struct ip_mc_list __rcu **mc_hash; 2622 struct ip_sf_list *psf; 2623 int rv = 0; 2624 2625 mc_hash = rcu_dereference(in_dev->mc_hash); 2626 if (mc_hash) { 2627 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2628 2629 for (im = rcu_dereference(mc_hash[hash]); 2630 im != NULL; 2631 im = rcu_dereference(im->next_hash)) { 2632 if (im->multiaddr == mc_addr) 2633 break; 2634 } 2635 } else { 2636 for_each_pmc_rcu(in_dev, im) { 2637 if (im->multiaddr == mc_addr) 2638 break; 2639 } 2640 } 2641 if (im && proto == IPPROTO_IGMP) { 2642 rv = 1; 2643 } else if (im) { 2644 if (src_addr) { 2645 for (psf = im->sources; psf; psf = psf->sf_next) { 2646 if (psf->sf_inaddr == src_addr) 2647 break; 2648 } 2649 if (psf) 2650 rv = psf->sf_count[MCAST_INCLUDE] || 2651 psf->sf_count[MCAST_EXCLUDE] != 2652 im->sfcount[MCAST_EXCLUDE]; 2653 else 2654 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2655 } else 2656 rv = 1; /* unspecified source; tentatively allow */ 2657 } 2658 return rv; 2659 } 2660 2661 #if defined(CONFIG_PROC_FS) 2662 struct igmp_mc_iter_state { 2663 struct seq_net_private p; 2664 struct net_device *dev; 2665 struct in_device *in_dev; 2666 }; 2667 2668 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2669 2670 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2671 { 2672 struct net *net = seq_file_net(seq); 2673 struct ip_mc_list *im = NULL; 2674 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2675 2676 state->in_dev = NULL; 2677 for_each_netdev_rcu(net, state->dev) { 2678 struct in_device *in_dev; 2679 2680 in_dev = __in_dev_get_rcu(state->dev); 2681 if (!in_dev) 2682 continue; 2683 im = rcu_dereference(in_dev->mc_list); 2684 if (im) { 2685 state->in_dev = in_dev; 2686 break; 2687 } 2688 } 2689 return im; 2690 } 2691 2692 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2693 { 2694 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2695 2696 im = rcu_dereference(im->next_rcu); 2697 while (!im) { 2698 state->dev = next_net_device_rcu(state->dev); 2699 if (!state->dev) { 2700 state->in_dev = NULL; 2701 break; 2702 } 2703 state->in_dev = __in_dev_get_rcu(state->dev); 2704 if (!state->in_dev) 2705 continue; 2706 im = rcu_dereference(state->in_dev->mc_list); 2707 } 2708 return im; 2709 } 2710 2711 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2712 { 2713 struct ip_mc_list *im = igmp_mc_get_first(seq); 2714 if (im) 2715 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2716 --pos; 2717 return pos ? NULL : im; 2718 } 2719 2720 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2721 __acquires(rcu) 2722 { 2723 rcu_read_lock(); 2724 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2725 } 2726 2727 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2728 { 2729 struct ip_mc_list *im; 2730 if (v == SEQ_START_TOKEN) 2731 im = igmp_mc_get_first(seq); 2732 else 2733 im = igmp_mc_get_next(seq, v); 2734 ++*pos; 2735 return im; 2736 } 2737 2738 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2739 __releases(rcu) 2740 { 2741 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2742 2743 state->in_dev = NULL; 2744 state->dev = NULL; 2745 rcu_read_unlock(); 2746 } 2747 2748 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2749 { 2750 if (v == SEQ_START_TOKEN) 2751 seq_puts(seq, 2752 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2753 else { 2754 struct ip_mc_list *im = (struct ip_mc_list *)v; 2755 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2756 char *querier; 2757 long delta; 2758 2759 #ifdef CONFIG_IP_MULTICAST 2760 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2761 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2762 "V3"; 2763 #else 2764 querier = "NONE"; 2765 #endif 2766 2767 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2768 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2769 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2770 } 2771 2772 delta = im->timer.expires - jiffies; 2773 seq_printf(seq, 2774 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2775 im->multiaddr, im->users, 2776 im->tm_running, 2777 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2778 im->reporter); 2779 } 2780 return 0; 2781 } 2782 2783 static const struct seq_operations igmp_mc_seq_ops = { 2784 .start = igmp_mc_seq_start, 2785 .next = igmp_mc_seq_next, 2786 .stop = igmp_mc_seq_stop, 2787 .show = igmp_mc_seq_show, 2788 }; 2789 2790 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2791 { 2792 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2793 sizeof(struct igmp_mc_iter_state)); 2794 } 2795 2796 static const struct file_operations igmp_mc_seq_fops = { 2797 .owner = THIS_MODULE, 2798 .open = igmp_mc_seq_open, 2799 .read = seq_read, 2800 .llseek = seq_lseek, 2801 .release = seq_release_net, 2802 }; 2803 2804 struct igmp_mcf_iter_state { 2805 struct seq_net_private p; 2806 struct net_device *dev; 2807 struct in_device *idev; 2808 struct ip_mc_list *im; 2809 }; 2810 2811 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2812 2813 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2814 { 2815 struct net *net = seq_file_net(seq); 2816 struct ip_sf_list *psf = NULL; 2817 struct ip_mc_list *im = NULL; 2818 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2819 2820 state->idev = NULL; 2821 state->im = NULL; 2822 for_each_netdev_rcu(net, state->dev) { 2823 struct in_device *idev; 2824 idev = __in_dev_get_rcu(state->dev); 2825 if (unlikely(!idev)) 2826 continue; 2827 im = rcu_dereference(idev->mc_list); 2828 if (likely(im)) { 2829 spin_lock_bh(&im->lock); 2830 psf = im->sources; 2831 if (likely(psf)) { 2832 state->im = im; 2833 state->idev = idev; 2834 break; 2835 } 2836 spin_unlock_bh(&im->lock); 2837 } 2838 } 2839 return psf; 2840 } 2841 2842 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2843 { 2844 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2845 2846 psf = psf->sf_next; 2847 while (!psf) { 2848 spin_unlock_bh(&state->im->lock); 2849 state->im = state->im->next; 2850 while (!state->im) { 2851 state->dev = next_net_device_rcu(state->dev); 2852 if (!state->dev) { 2853 state->idev = NULL; 2854 goto out; 2855 } 2856 state->idev = __in_dev_get_rcu(state->dev); 2857 if (!state->idev) 2858 continue; 2859 state->im = rcu_dereference(state->idev->mc_list); 2860 } 2861 if (!state->im) 2862 break; 2863 spin_lock_bh(&state->im->lock); 2864 psf = state->im->sources; 2865 } 2866 out: 2867 return psf; 2868 } 2869 2870 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2871 { 2872 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2873 if (psf) 2874 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2875 --pos; 2876 return pos ? NULL : psf; 2877 } 2878 2879 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2880 __acquires(rcu) 2881 { 2882 rcu_read_lock(); 2883 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2884 } 2885 2886 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2887 { 2888 struct ip_sf_list *psf; 2889 if (v == SEQ_START_TOKEN) 2890 psf = igmp_mcf_get_first(seq); 2891 else 2892 psf = igmp_mcf_get_next(seq, v); 2893 ++*pos; 2894 return psf; 2895 } 2896 2897 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2898 __releases(rcu) 2899 { 2900 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2901 if (likely(state->im)) { 2902 spin_unlock_bh(&state->im->lock); 2903 state->im = NULL; 2904 } 2905 state->idev = NULL; 2906 state->dev = NULL; 2907 rcu_read_unlock(); 2908 } 2909 2910 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2911 { 2912 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2913 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2914 2915 if (v == SEQ_START_TOKEN) { 2916 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2917 } else { 2918 seq_printf(seq, 2919 "%3d %6.6s 0x%08x " 2920 "0x%08x %6lu %6lu\n", 2921 state->dev->ifindex, state->dev->name, 2922 ntohl(state->im->multiaddr), 2923 ntohl(psf->sf_inaddr), 2924 psf->sf_count[MCAST_INCLUDE], 2925 psf->sf_count[MCAST_EXCLUDE]); 2926 } 2927 return 0; 2928 } 2929 2930 static const struct seq_operations igmp_mcf_seq_ops = { 2931 .start = igmp_mcf_seq_start, 2932 .next = igmp_mcf_seq_next, 2933 .stop = igmp_mcf_seq_stop, 2934 .show = igmp_mcf_seq_show, 2935 }; 2936 2937 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2938 { 2939 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2940 sizeof(struct igmp_mcf_iter_state)); 2941 } 2942 2943 static const struct file_operations igmp_mcf_seq_fops = { 2944 .owner = THIS_MODULE, 2945 .open = igmp_mcf_seq_open, 2946 .read = seq_read, 2947 .llseek = seq_lseek, 2948 .release = seq_release_net, 2949 }; 2950 2951 static int __net_init igmp_net_init(struct net *net) 2952 { 2953 struct proc_dir_entry *pde; 2954 int err; 2955 2956 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); 2957 if (!pde) 2958 goto out_igmp; 2959 pde = proc_create("mcfilter", S_IRUGO, net->proc_net, 2960 &igmp_mcf_seq_fops); 2961 if (!pde) 2962 goto out_mcfilter; 2963 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, 2964 SOCK_DGRAM, 0, net); 2965 if (err < 0) { 2966 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", 2967 err); 2968 goto out_sock; 2969 } 2970 2971 /* Sysctl initialization */ 2972 net->ipv4.sysctl_igmp_max_memberships = 20; 2973 net->ipv4.sysctl_igmp_max_msf = 10; 2974 /* IGMP reports for link-local multicast groups are enabled by default */ 2975 net->ipv4.sysctl_igmp_llm_reports = 1; 2976 net->ipv4.sysctl_igmp_qrv = 2; 2977 return 0; 2978 2979 out_sock: 2980 remove_proc_entry("mcfilter", net->proc_net); 2981 out_mcfilter: 2982 remove_proc_entry("igmp", net->proc_net); 2983 out_igmp: 2984 return -ENOMEM; 2985 } 2986 2987 static void __net_exit igmp_net_exit(struct net *net) 2988 { 2989 remove_proc_entry("mcfilter", net->proc_net); 2990 remove_proc_entry("igmp", net->proc_net); 2991 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); 2992 } 2993 2994 static struct pernet_operations igmp_net_ops = { 2995 .init = igmp_net_init, 2996 .exit = igmp_net_exit, 2997 }; 2998 #endif 2999 3000 static int igmp_netdev_event(struct notifier_block *this, 3001 unsigned long event, void *ptr) 3002 { 3003 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3004 struct in_device *in_dev; 3005 3006 switch (event) { 3007 case NETDEV_RESEND_IGMP: 3008 in_dev = __in_dev_get_rtnl(dev); 3009 if (in_dev) 3010 ip_mc_rejoin_groups(in_dev); 3011 break; 3012 default: 3013 break; 3014 } 3015 return NOTIFY_DONE; 3016 } 3017 3018 static struct notifier_block igmp_notifier = { 3019 .notifier_call = igmp_netdev_event, 3020 }; 3021 3022 int __init igmp_mc_init(void) 3023 { 3024 #if defined(CONFIG_PROC_FS) 3025 int err; 3026 3027 err = register_pernet_subsys(&igmp_net_ops); 3028 if (err) 3029 return err; 3030 err = register_netdevice_notifier(&igmp_notifier); 3031 if (err) 3032 goto reg_notif_fail; 3033 return 0; 3034 3035 reg_notif_fail: 3036 unregister_pernet_subsys(&igmp_net_ops); 3037 return err; 3038 #else 3039 return register_netdevice_notifier(&igmp_notifier); 3040 #endif 3041 } 3042