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 (refcount_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 refcount_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 refcount_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 refcount_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 = 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 = 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 = 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_init(&pmc->lock); 1116 spin_lock_bh(&im->lock); 1117 pmc->interface = im->interface; 1118 in_dev_hold(in_dev); 1119 pmc->multiaddr = im->multiaddr; 1120 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1121 pmc->sfmode = im->sfmode; 1122 if (pmc->sfmode == MCAST_INCLUDE) { 1123 struct ip_sf_list *psf; 1124 1125 pmc->tomb = im->tomb; 1126 pmc->sources = im->sources; 1127 im->tomb = im->sources = NULL; 1128 for (psf = pmc->sources; psf; psf = psf->sf_next) 1129 psf->sf_crcount = pmc->crcount; 1130 } 1131 spin_unlock_bh(&im->lock); 1132 1133 spin_lock_bh(&in_dev->mc_tomb_lock); 1134 pmc->next = in_dev->mc_tomb; 1135 in_dev->mc_tomb = pmc; 1136 spin_unlock_bh(&in_dev->mc_tomb_lock); 1137 } 1138 1139 /* 1140 * restore ip_mc_list deleted records 1141 */ 1142 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1143 { 1144 struct ip_mc_list *pmc, *pmc_prev; 1145 struct ip_sf_list *psf; 1146 struct net *net = dev_net(in_dev->dev); 1147 __be32 multiaddr = im->multiaddr; 1148 1149 spin_lock_bh(&in_dev->mc_tomb_lock); 1150 pmc_prev = NULL; 1151 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1152 if (pmc->multiaddr == multiaddr) 1153 break; 1154 pmc_prev = pmc; 1155 } 1156 if (pmc) { 1157 if (pmc_prev) 1158 pmc_prev->next = pmc->next; 1159 else 1160 in_dev->mc_tomb = pmc->next; 1161 } 1162 spin_unlock_bh(&in_dev->mc_tomb_lock); 1163 1164 spin_lock_bh(&im->lock); 1165 if (pmc) { 1166 im->interface = pmc->interface; 1167 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1168 im->sfmode = pmc->sfmode; 1169 if (pmc->sfmode == MCAST_INCLUDE) { 1170 im->tomb = pmc->tomb; 1171 im->sources = pmc->sources; 1172 for (psf = im->sources; psf; psf = psf->sf_next) 1173 psf->sf_crcount = im->crcount; 1174 } 1175 in_dev_put(pmc->interface); 1176 kfree(pmc); 1177 } 1178 spin_unlock_bh(&im->lock); 1179 } 1180 1181 /* 1182 * flush ip_mc_list deleted records 1183 */ 1184 static void igmpv3_clear_delrec(struct in_device *in_dev) 1185 { 1186 struct ip_mc_list *pmc, *nextpmc; 1187 1188 spin_lock_bh(&in_dev->mc_tomb_lock); 1189 pmc = in_dev->mc_tomb; 1190 in_dev->mc_tomb = NULL; 1191 spin_unlock_bh(&in_dev->mc_tomb_lock); 1192 1193 for (; pmc; pmc = nextpmc) { 1194 nextpmc = pmc->next; 1195 ip_mc_clear_src(pmc); 1196 in_dev_put(pmc->interface); 1197 kfree(pmc); 1198 } 1199 /* clear dead sources, too */ 1200 rcu_read_lock(); 1201 for_each_pmc_rcu(in_dev, pmc) { 1202 struct ip_sf_list *psf, *psf_next; 1203 1204 spin_lock_bh(&pmc->lock); 1205 psf = pmc->tomb; 1206 pmc->tomb = NULL; 1207 spin_unlock_bh(&pmc->lock); 1208 for (; psf; psf = psf_next) { 1209 psf_next = psf->sf_next; 1210 kfree(psf); 1211 } 1212 } 1213 rcu_read_unlock(); 1214 } 1215 #endif 1216 1217 static void igmp_group_dropped(struct ip_mc_list *im) 1218 { 1219 struct in_device *in_dev = im->interface; 1220 #ifdef CONFIG_IP_MULTICAST 1221 struct net *net = dev_net(in_dev->dev); 1222 int reporter; 1223 #endif 1224 1225 if (im->loaded) { 1226 im->loaded = 0; 1227 ip_mc_filter_del(in_dev, im->multiaddr); 1228 } 1229 1230 #ifdef CONFIG_IP_MULTICAST 1231 if (im->multiaddr == IGMP_ALL_HOSTS) 1232 return; 1233 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1234 return; 1235 1236 reporter = im->reporter; 1237 igmp_stop_timer(im); 1238 1239 if (!in_dev->dead) { 1240 if (IGMP_V1_SEEN(in_dev)) 1241 return; 1242 if (IGMP_V2_SEEN(in_dev)) { 1243 if (reporter) 1244 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1245 return; 1246 } 1247 /* IGMPv3 */ 1248 igmpv3_add_delrec(in_dev, im); 1249 1250 igmp_ifc_event(in_dev); 1251 } 1252 #endif 1253 } 1254 1255 static void igmp_group_added(struct ip_mc_list *im) 1256 { 1257 struct in_device *in_dev = im->interface; 1258 #ifdef CONFIG_IP_MULTICAST 1259 struct net *net = dev_net(in_dev->dev); 1260 #endif 1261 1262 if (im->loaded == 0) { 1263 im->loaded = 1; 1264 ip_mc_filter_add(in_dev, im->multiaddr); 1265 } 1266 1267 #ifdef CONFIG_IP_MULTICAST 1268 if (im->multiaddr == IGMP_ALL_HOSTS) 1269 return; 1270 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1271 return; 1272 1273 if (in_dev->dead) 1274 return; 1275 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1276 spin_lock_bh(&im->lock); 1277 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1278 spin_unlock_bh(&im->lock); 1279 return; 1280 } 1281 /* else, v3 */ 1282 1283 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1284 igmp_ifc_event(in_dev); 1285 #endif 1286 } 1287 1288 1289 /* 1290 * Multicast list managers 1291 */ 1292 1293 static u32 ip_mc_hash(const struct ip_mc_list *im) 1294 { 1295 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1296 } 1297 1298 static void ip_mc_hash_add(struct in_device *in_dev, 1299 struct ip_mc_list *im) 1300 { 1301 struct ip_mc_list __rcu **mc_hash; 1302 u32 hash; 1303 1304 mc_hash = rtnl_dereference(in_dev->mc_hash); 1305 if (mc_hash) { 1306 hash = ip_mc_hash(im); 1307 im->next_hash = mc_hash[hash]; 1308 rcu_assign_pointer(mc_hash[hash], im); 1309 return; 1310 } 1311 1312 /* do not use a hash table for small number of items */ 1313 if (in_dev->mc_count < 4) 1314 return; 1315 1316 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1317 GFP_KERNEL); 1318 if (!mc_hash) 1319 return; 1320 1321 for_each_pmc_rtnl(in_dev, im) { 1322 hash = ip_mc_hash(im); 1323 im->next_hash = mc_hash[hash]; 1324 RCU_INIT_POINTER(mc_hash[hash], im); 1325 } 1326 1327 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1328 } 1329 1330 static void ip_mc_hash_remove(struct in_device *in_dev, 1331 struct ip_mc_list *im) 1332 { 1333 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1334 struct ip_mc_list *aux; 1335 1336 if (!mc_hash) 1337 return; 1338 mc_hash += ip_mc_hash(im); 1339 while ((aux = rtnl_dereference(*mc_hash)) != im) 1340 mc_hash = &aux->next_hash; 1341 *mc_hash = im->next_hash; 1342 } 1343 1344 1345 /* 1346 * A socket has joined a multicast group on device dev. 1347 */ 1348 1349 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1350 { 1351 struct ip_mc_list *im; 1352 #ifdef CONFIG_IP_MULTICAST 1353 struct net *net = dev_net(in_dev->dev); 1354 #endif 1355 1356 ASSERT_RTNL(); 1357 1358 for_each_pmc_rtnl(in_dev, im) { 1359 if (im->multiaddr == addr) { 1360 im->users++; 1361 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1362 goto out; 1363 } 1364 } 1365 1366 im = kzalloc(sizeof(*im), GFP_KERNEL); 1367 if (!im) 1368 goto out; 1369 1370 im->users = 1; 1371 im->interface = in_dev; 1372 in_dev_hold(in_dev); 1373 im->multiaddr = addr; 1374 /* initial mode is (EX, empty) */ 1375 im->sfmode = MCAST_EXCLUDE; 1376 im->sfcount[MCAST_EXCLUDE] = 1; 1377 refcount_set(&im->refcnt, 1); 1378 spin_lock_init(&im->lock); 1379 #ifdef CONFIG_IP_MULTICAST 1380 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); 1381 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; 1382 #endif 1383 1384 im->next_rcu = in_dev->mc_list; 1385 in_dev->mc_count++; 1386 rcu_assign_pointer(in_dev->mc_list, im); 1387 1388 ip_mc_hash_add(in_dev, im); 1389 1390 #ifdef CONFIG_IP_MULTICAST 1391 igmpv3_del_delrec(in_dev, im); 1392 #endif 1393 igmp_group_added(im); 1394 if (!in_dev->dead) 1395 ip_rt_multicast_event(in_dev); 1396 out: 1397 return; 1398 } 1399 EXPORT_SYMBOL(ip_mc_inc_group); 1400 1401 static int ip_mc_check_iphdr(struct sk_buff *skb) 1402 { 1403 const struct iphdr *iph; 1404 unsigned int len; 1405 unsigned int offset = skb_network_offset(skb) + sizeof(*iph); 1406 1407 if (!pskb_may_pull(skb, offset)) 1408 return -EINVAL; 1409 1410 iph = ip_hdr(skb); 1411 1412 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) 1413 return -EINVAL; 1414 1415 offset += ip_hdrlen(skb) - sizeof(*iph); 1416 1417 if (!pskb_may_pull(skb, offset)) 1418 return -EINVAL; 1419 1420 iph = ip_hdr(skb); 1421 1422 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1423 return -EINVAL; 1424 1425 len = skb_network_offset(skb) + ntohs(iph->tot_len); 1426 if (skb->len < len || len < offset) 1427 return -EINVAL; 1428 1429 skb_set_transport_header(skb, offset); 1430 1431 return 0; 1432 } 1433 1434 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) 1435 { 1436 unsigned int len = skb_transport_offset(skb); 1437 1438 len += sizeof(struct igmpv3_report); 1439 1440 return pskb_may_pull(skb, len) ? 0 : -EINVAL; 1441 } 1442 1443 static int ip_mc_check_igmp_query(struct sk_buff *skb) 1444 { 1445 unsigned int len = skb_transport_offset(skb); 1446 1447 len += sizeof(struct igmphdr); 1448 if (skb->len < len) 1449 return -EINVAL; 1450 1451 /* IGMPv{1,2}? */ 1452 if (skb->len != len) { 1453 /* or IGMPv3? */ 1454 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); 1455 if (skb->len < len || !pskb_may_pull(skb, len)) 1456 return -EINVAL; 1457 } 1458 1459 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1460 * all-systems destination addresses (224.0.0.1) for general queries 1461 */ 1462 if (!igmp_hdr(skb)->group && 1463 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) 1464 return -EINVAL; 1465 1466 return 0; 1467 } 1468 1469 static int ip_mc_check_igmp_msg(struct sk_buff *skb) 1470 { 1471 switch (igmp_hdr(skb)->type) { 1472 case IGMP_HOST_LEAVE_MESSAGE: 1473 case IGMP_HOST_MEMBERSHIP_REPORT: 1474 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1475 /* fall through */ 1476 return 0; 1477 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1478 return ip_mc_check_igmp_reportv3(skb); 1479 case IGMP_HOST_MEMBERSHIP_QUERY: 1480 return ip_mc_check_igmp_query(skb); 1481 default: 1482 return -ENOMSG; 1483 } 1484 } 1485 1486 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) 1487 { 1488 return skb_checksum_simple_validate(skb); 1489 } 1490 1491 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1492 1493 { 1494 struct sk_buff *skb_chk; 1495 unsigned int transport_len; 1496 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); 1497 int ret = -EINVAL; 1498 1499 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); 1500 1501 skb_chk = skb_checksum_trimmed(skb, transport_len, 1502 ip_mc_validate_checksum); 1503 if (!skb_chk) 1504 goto err; 1505 1506 if (!pskb_may_pull(skb_chk, len)) 1507 goto err; 1508 1509 ret = ip_mc_check_igmp_msg(skb_chk); 1510 if (ret) 1511 goto err; 1512 1513 if (skb_trimmed) 1514 *skb_trimmed = skb_chk; 1515 /* free now unneeded clone */ 1516 else if (skb_chk != skb) 1517 kfree_skb(skb_chk); 1518 1519 ret = 0; 1520 1521 err: 1522 if (ret && skb_chk && skb_chk != skb) 1523 kfree_skb(skb_chk); 1524 1525 return ret; 1526 } 1527 1528 /** 1529 * ip_mc_check_igmp - checks whether this is a sane IGMP packet 1530 * @skb: the skb to validate 1531 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) 1532 * 1533 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets 1534 * skb transport header accordingly and returns zero. 1535 * 1536 * -EINVAL: A broken packet was detected, i.e. it violates some internet 1537 * standard 1538 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. 1539 * -ENOMEM: A memory allocation failure happened. 1540 * 1541 * Optionally, an skb pointer might be provided via skb_trimmed (or set it 1542 * to NULL): After parsing an IGMP packet successfully it will point to 1543 * an skb which has its tail aligned to the IP packet end. This might 1544 * either be the originally provided skb or a trimmed, cloned version if 1545 * the skb frame had data beyond the IP packet. A cloned skb allows us 1546 * to leave the original skb and its full frame unchanged (which might be 1547 * desirable for layer 2 frame jugglers). 1548 * 1549 * Caller needs to set the skb network header and free any returned skb if it 1550 * differs from the provided skb. 1551 */ 1552 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) 1553 { 1554 int ret = ip_mc_check_iphdr(skb); 1555 1556 if (ret < 0) 1557 return ret; 1558 1559 if (ip_hdr(skb)->protocol != IPPROTO_IGMP) 1560 return -ENOMSG; 1561 1562 return __ip_mc_check_igmp(skb, skb_trimmed); 1563 } 1564 EXPORT_SYMBOL(ip_mc_check_igmp); 1565 1566 /* 1567 * Resend IGMP JOIN report; used by netdev notifier. 1568 */ 1569 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1570 { 1571 #ifdef CONFIG_IP_MULTICAST 1572 struct ip_mc_list *im; 1573 int type; 1574 struct net *net = dev_net(in_dev->dev); 1575 1576 ASSERT_RTNL(); 1577 1578 for_each_pmc_rtnl(in_dev, im) { 1579 if (im->multiaddr == IGMP_ALL_HOSTS) 1580 continue; 1581 if (ipv4_is_local_multicast(im->multiaddr) && 1582 !net->ipv4.sysctl_igmp_llm_reports) 1583 continue; 1584 1585 /* a failover is happening and switches 1586 * must be notified immediately 1587 */ 1588 if (IGMP_V1_SEEN(in_dev)) 1589 type = IGMP_HOST_MEMBERSHIP_REPORT; 1590 else if (IGMP_V2_SEEN(in_dev)) 1591 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1592 else 1593 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1594 igmp_send_report(in_dev, im, type); 1595 } 1596 #endif 1597 } 1598 1599 /* 1600 * A socket has left a multicast group on device dev 1601 */ 1602 1603 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1604 { 1605 struct ip_mc_list *i; 1606 struct ip_mc_list __rcu **ip; 1607 1608 ASSERT_RTNL(); 1609 1610 for (ip = &in_dev->mc_list; 1611 (i = rtnl_dereference(*ip)) != NULL; 1612 ip = &i->next_rcu) { 1613 if (i->multiaddr == addr) { 1614 if (--i->users == 0) { 1615 ip_mc_hash_remove(in_dev, i); 1616 *ip = i->next_rcu; 1617 in_dev->mc_count--; 1618 igmp_group_dropped(i); 1619 ip_mc_clear_src(i); 1620 1621 if (!in_dev->dead) 1622 ip_rt_multicast_event(in_dev); 1623 1624 ip_ma_put(i); 1625 return; 1626 } 1627 break; 1628 } 1629 } 1630 } 1631 EXPORT_SYMBOL(ip_mc_dec_group); 1632 1633 /* Device changing type */ 1634 1635 void ip_mc_unmap(struct in_device *in_dev) 1636 { 1637 struct ip_mc_list *pmc; 1638 1639 ASSERT_RTNL(); 1640 1641 for_each_pmc_rtnl(in_dev, pmc) 1642 igmp_group_dropped(pmc); 1643 } 1644 1645 void ip_mc_remap(struct in_device *in_dev) 1646 { 1647 struct ip_mc_list *pmc; 1648 1649 ASSERT_RTNL(); 1650 1651 for_each_pmc_rtnl(in_dev, pmc) { 1652 #ifdef CONFIG_IP_MULTICAST 1653 igmpv3_del_delrec(in_dev, pmc); 1654 #endif 1655 igmp_group_added(pmc); 1656 } 1657 } 1658 1659 /* Device going down */ 1660 1661 void ip_mc_down(struct in_device *in_dev) 1662 { 1663 struct ip_mc_list *pmc; 1664 1665 ASSERT_RTNL(); 1666 1667 for_each_pmc_rtnl(in_dev, pmc) 1668 igmp_group_dropped(pmc); 1669 1670 #ifdef CONFIG_IP_MULTICAST 1671 in_dev->mr_ifc_count = 0; 1672 if (del_timer(&in_dev->mr_ifc_timer)) 1673 __in_dev_put(in_dev); 1674 in_dev->mr_gq_running = 0; 1675 if (del_timer(&in_dev->mr_gq_timer)) 1676 __in_dev_put(in_dev); 1677 #endif 1678 1679 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1680 } 1681 1682 void ip_mc_init_dev(struct in_device *in_dev) 1683 { 1684 #ifdef CONFIG_IP_MULTICAST 1685 struct net *net = dev_net(in_dev->dev); 1686 #endif 1687 ASSERT_RTNL(); 1688 1689 #ifdef CONFIG_IP_MULTICAST 1690 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1691 (unsigned long)in_dev); 1692 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1693 (unsigned long)in_dev); 1694 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1695 #endif 1696 1697 spin_lock_init(&in_dev->mc_tomb_lock); 1698 } 1699 1700 /* Device going up */ 1701 1702 void ip_mc_up(struct in_device *in_dev) 1703 { 1704 struct ip_mc_list *pmc; 1705 #ifdef CONFIG_IP_MULTICAST 1706 struct net *net = dev_net(in_dev->dev); 1707 #endif 1708 1709 ASSERT_RTNL(); 1710 1711 #ifdef CONFIG_IP_MULTICAST 1712 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1713 #endif 1714 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1715 1716 for_each_pmc_rtnl(in_dev, pmc) { 1717 #ifdef CONFIG_IP_MULTICAST 1718 igmpv3_del_delrec(in_dev, pmc); 1719 #endif 1720 igmp_group_added(pmc); 1721 } 1722 } 1723 1724 /* 1725 * Device is about to be destroyed: clean up. 1726 */ 1727 1728 void ip_mc_destroy_dev(struct in_device *in_dev) 1729 { 1730 struct ip_mc_list *i; 1731 1732 ASSERT_RTNL(); 1733 1734 /* Deactivate timers */ 1735 ip_mc_down(in_dev); 1736 #ifdef CONFIG_IP_MULTICAST 1737 igmpv3_clear_delrec(in_dev); 1738 #endif 1739 1740 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1741 in_dev->mc_list = i->next_rcu; 1742 in_dev->mc_count--; 1743 ip_ma_put(i); 1744 } 1745 } 1746 1747 /* RTNL is locked */ 1748 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1749 { 1750 struct net_device *dev = NULL; 1751 struct in_device *idev = NULL; 1752 1753 if (imr->imr_ifindex) { 1754 idev = inetdev_by_index(net, imr->imr_ifindex); 1755 return idev; 1756 } 1757 if (imr->imr_address.s_addr) { 1758 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1759 if (!dev) 1760 return NULL; 1761 } 1762 1763 if (!dev) { 1764 struct rtable *rt = ip_route_output(net, 1765 imr->imr_multiaddr.s_addr, 1766 0, 0, 0); 1767 if (!IS_ERR(rt)) { 1768 dev = rt->dst.dev; 1769 ip_rt_put(rt); 1770 } 1771 } 1772 if (dev) { 1773 imr->imr_ifindex = dev->ifindex; 1774 idev = __in_dev_get_rtnl(dev); 1775 } 1776 return idev; 1777 } 1778 1779 /* 1780 * Join a socket to a group 1781 */ 1782 1783 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1784 __be32 *psfsrc) 1785 { 1786 struct ip_sf_list *psf, *psf_prev; 1787 int rv = 0; 1788 1789 psf_prev = NULL; 1790 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1791 if (psf->sf_inaddr == *psfsrc) 1792 break; 1793 psf_prev = psf; 1794 } 1795 if (!psf || psf->sf_count[sfmode] == 0) { 1796 /* source filter not found, or count wrong => bug */ 1797 return -ESRCH; 1798 } 1799 psf->sf_count[sfmode]--; 1800 if (psf->sf_count[sfmode] == 0) { 1801 ip_rt_multicast_event(pmc->interface); 1802 } 1803 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1804 #ifdef CONFIG_IP_MULTICAST 1805 struct in_device *in_dev = pmc->interface; 1806 struct net *net = dev_net(in_dev->dev); 1807 #endif 1808 1809 /* no more filters for this source */ 1810 if (psf_prev) 1811 psf_prev->sf_next = psf->sf_next; 1812 else 1813 pmc->sources = psf->sf_next; 1814 #ifdef CONFIG_IP_MULTICAST 1815 if (psf->sf_oldin && 1816 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1817 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1818 psf->sf_next = pmc->tomb; 1819 pmc->tomb = psf; 1820 rv = 1; 1821 } else 1822 #endif 1823 kfree(psf); 1824 } 1825 return rv; 1826 } 1827 1828 #ifndef CONFIG_IP_MULTICAST 1829 #define igmp_ifc_event(x) do { } while (0) 1830 #endif 1831 1832 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1833 int sfcount, __be32 *psfsrc, int delta) 1834 { 1835 struct ip_mc_list *pmc; 1836 int changerec = 0; 1837 int i, err; 1838 1839 if (!in_dev) 1840 return -ENODEV; 1841 rcu_read_lock(); 1842 for_each_pmc_rcu(in_dev, pmc) { 1843 if (*pmca == pmc->multiaddr) 1844 break; 1845 } 1846 if (!pmc) { 1847 /* MCA not found?? bug */ 1848 rcu_read_unlock(); 1849 return -ESRCH; 1850 } 1851 spin_lock_bh(&pmc->lock); 1852 rcu_read_unlock(); 1853 #ifdef CONFIG_IP_MULTICAST 1854 sf_markstate(pmc); 1855 #endif 1856 if (!delta) { 1857 err = -EINVAL; 1858 if (!pmc->sfcount[sfmode]) 1859 goto out_unlock; 1860 pmc->sfcount[sfmode]--; 1861 } 1862 err = 0; 1863 for (i = 0; i < sfcount; i++) { 1864 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1865 1866 changerec |= rv > 0; 1867 if (!err && rv < 0) 1868 err = rv; 1869 } 1870 if (pmc->sfmode == MCAST_EXCLUDE && 1871 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1872 pmc->sfcount[MCAST_INCLUDE]) { 1873 #ifdef CONFIG_IP_MULTICAST 1874 struct ip_sf_list *psf; 1875 struct net *net = dev_net(in_dev->dev); 1876 #endif 1877 1878 /* filter mode change */ 1879 pmc->sfmode = MCAST_INCLUDE; 1880 #ifdef CONFIG_IP_MULTICAST 1881 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1882 in_dev->mr_ifc_count = pmc->crcount; 1883 for (psf = pmc->sources; psf; psf = psf->sf_next) 1884 psf->sf_crcount = 0; 1885 igmp_ifc_event(pmc->interface); 1886 } else if (sf_setstate(pmc) || changerec) { 1887 igmp_ifc_event(pmc->interface); 1888 #endif 1889 } 1890 out_unlock: 1891 spin_unlock_bh(&pmc->lock); 1892 return err; 1893 } 1894 1895 /* 1896 * Add multicast single-source filter to the interface list 1897 */ 1898 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1899 __be32 *psfsrc) 1900 { 1901 struct ip_sf_list *psf, *psf_prev; 1902 1903 psf_prev = NULL; 1904 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1905 if (psf->sf_inaddr == *psfsrc) 1906 break; 1907 psf_prev = psf; 1908 } 1909 if (!psf) { 1910 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1911 if (!psf) 1912 return -ENOBUFS; 1913 psf->sf_inaddr = *psfsrc; 1914 if (psf_prev) { 1915 psf_prev->sf_next = psf; 1916 } else 1917 pmc->sources = psf; 1918 } 1919 psf->sf_count[sfmode]++; 1920 if (psf->sf_count[sfmode] == 1) { 1921 ip_rt_multicast_event(pmc->interface); 1922 } 1923 return 0; 1924 } 1925 1926 #ifdef CONFIG_IP_MULTICAST 1927 static void sf_markstate(struct ip_mc_list *pmc) 1928 { 1929 struct ip_sf_list *psf; 1930 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1931 1932 for (psf = pmc->sources; psf; psf = psf->sf_next) 1933 if (pmc->sfcount[MCAST_EXCLUDE]) { 1934 psf->sf_oldin = mca_xcount == 1935 psf->sf_count[MCAST_EXCLUDE] && 1936 !psf->sf_count[MCAST_INCLUDE]; 1937 } else 1938 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1939 } 1940 1941 static int sf_setstate(struct ip_mc_list *pmc) 1942 { 1943 struct ip_sf_list *psf, *dpsf; 1944 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1945 int qrv = pmc->interface->mr_qrv; 1946 int new_in, rv; 1947 1948 rv = 0; 1949 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1950 if (pmc->sfcount[MCAST_EXCLUDE]) { 1951 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1952 !psf->sf_count[MCAST_INCLUDE]; 1953 } else 1954 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1955 if (new_in) { 1956 if (!psf->sf_oldin) { 1957 struct ip_sf_list *prev = NULL; 1958 1959 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 1960 if (dpsf->sf_inaddr == psf->sf_inaddr) 1961 break; 1962 prev = dpsf; 1963 } 1964 if (dpsf) { 1965 if (prev) 1966 prev->sf_next = dpsf->sf_next; 1967 else 1968 pmc->tomb = dpsf->sf_next; 1969 kfree(dpsf); 1970 } 1971 psf->sf_crcount = qrv; 1972 rv++; 1973 } 1974 } else if (psf->sf_oldin) { 1975 1976 psf->sf_crcount = 0; 1977 /* 1978 * add or update "delete" records if an active filter 1979 * is now inactive 1980 */ 1981 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 1982 if (dpsf->sf_inaddr == psf->sf_inaddr) 1983 break; 1984 if (!dpsf) { 1985 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1986 if (!dpsf) 1987 continue; 1988 *dpsf = *psf; 1989 /* pmc->lock held by callers */ 1990 dpsf->sf_next = pmc->tomb; 1991 pmc->tomb = dpsf; 1992 } 1993 dpsf->sf_crcount = qrv; 1994 rv++; 1995 } 1996 } 1997 return rv; 1998 } 1999 #endif 2000 2001 /* 2002 * Add multicast source filter list to the interface list 2003 */ 2004 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 2005 int sfcount, __be32 *psfsrc, int delta) 2006 { 2007 struct ip_mc_list *pmc; 2008 int isexclude; 2009 int i, err; 2010 2011 if (!in_dev) 2012 return -ENODEV; 2013 rcu_read_lock(); 2014 for_each_pmc_rcu(in_dev, pmc) { 2015 if (*pmca == pmc->multiaddr) 2016 break; 2017 } 2018 if (!pmc) { 2019 /* MCA not found?? bug */ 2020 rcu_read_unlock(); 2021 return -ESRCH; 2022 } 2023 spin_lock_bh(&pmc->lock); 2024 rcu_read_unlock(); 2025 2026 #ifdef CONFIG_IP_MULTICAST 2027 sf_markstate(pmc); 2028 #endif 2029 isexclude = pmc->sfmode == MCAST_EXCLUDE; 2030 if (!delta) 2031 pmc->sfcount[sfmode]++; 2032 err = 0; 2033 for (i = 0; i < sfcount; i++) { 2034 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2035 if (err) 2036 break; 2037 } 2038 if (err) { 2039 int j; 2040 2041 if (!delta) 2042 pmc->sfcount[sfmode]--; 2043 for (j = 0; j < i; j++) 2044 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2045 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 2046 #ifdef CONFIG_IP_MULTICAST 2047 struct ip_sf_list *psf; 2048 struct net *net = dev_net(pmc->interface->dev); 2049 in_dev = pmc->interface; 2050 #endif 2051 2052 /* filter mode change */ 2053 if (pmc->sfcount[MCAST_EXCLUDE]) 2054 pmc->sfmode = MCAST_EXCLUDE; 2055 else if (pmc->sfcount[MCAST_INCLUDE]) 2056 pmc->sfmode = MCAST_INCLUDE; 2057 #ifdef CONFIG_IP_MULTICAST 2058 /* else no filters; keep old mode for reports */ 2059 2060 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 2061 in_dev->mr_ifc_count = pmc->crcount; 2062 for (psf = pmc->sources; psf; psf = psf->sf_next) 2063 psf->sf_crcount = 0; 2064 igmp_ifc_event(in_dev); 2065 } else if (sf_setstate(pmc)) { 2066 igmp_ifc_event(in_dev); 2067 #endif 2068 } 2069 spin_unlock_bh(&pmc->lock); 2070 return err; 2071 } 2072 2073 static void ip_mc_clear_src(struct ip_mc_list *pmc) 2074 { 2075 struct ip_sf_list *psf, *nextpsf, *tomb, *sources; 2076 2077 spin_lock_bh(&pmc->lock); 2078 tomb = pmc->tomb; 2079 pmc->tomb = NULL; 2080 sources = pmc->sources; 2081 pmc->sources = NULL; 2082 pmc->sfmode = MCAST_EXCLUDE; 2083 pmc->sfcount[MCAST_INCLUDE] = 0; 2084 pmc->sfcount[MCAST_EXCLUDE] = 1; 2085 spin_unlock_bh(&pmc->lock); 2086 2087 for (psf = tomb; psf; psf = nextpsf) { 2088 nextpsf = psf->sf_next; 2089 kfree(psf); 2090 } 2091 for (psf = sources; psf; psf = nextpsf) { 2092 nextpsf = psf->sf_next; 2093 kfree(psf); 2094 } 2095 } 2096 2097 /* Join a multicast group 2098 */ 2099 2100 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) 2101 { 2102 __be32 addr = imr->imr_multiaddr.s_addr; 2103 struct ip_mc_socklist *iml, *i; 2104 struct in_device *in_dev; 2105 struct inet_sock *inet = inet_sk(sk); 2106 struct net *net = sock_net(sk); 2107 int ifindex; 2108 int count = 0; 2109 int err; 2110 2111 ASSERT_RTNL(); 2112 2113 if (!ipv4_is_multicast(addr)) 2114 return -EINVAL; 2115 2116 in_dev = ip_mc_find_dev(net, imr); 2117 2118 if (!in_dev) { 2119 err = -ENODEV; 2120 goto done; 2121 } 2122 2123 err = -EADDRINUSE; 2124 ifindex = imr->imr_ifindex; 2125 for_each_pmc_rtnl(inet, i) { 2126 if (i->multi.imr_multiaddr.s_addr == addr && 2127 i->multi.imr_ifindex == ifindex) 2128 goto done; 2129 count++; 2130 } 2131 err = -ENOBUFS; 2132 if (count >= net->ipv4.sysctl_igmp_max_memberships) 2133 goto done; 2134 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 2135 if (!iml) 2136 goto done; 2137 2138 memcpy(&iml->multi, imr, sizeof(*imr)); 2139 iml->next_rcu = inet->mc_list; 2140 iml->sflist = NULL; 2141 iml->sfmode = MCAST_EXCLUDE; 2142 rcu_assign_pointer(inet->mc_list, iml); 2143 ip_mc_inc_group(in_dev, addr); 2144 err = 0; 2145 done: 2146 return err; 2147 } 2148 EXPORT_SYMBOL(ip_mc_join_group); 2149 2150 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 2151 struct in_device *in_dev) 2152 { 2153 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 2154 int err; 2155 2156 if (!psf) { 2157 /* any-source empty exclude case */ 2158 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2159 iml->sfmode, 0, NULL, 0); 2160 } 2161 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2162 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 2163 RCU_INIT_POINTER(iml->sflist, NULL); 2164 /* decrease mem now to avoid the memleak warning */ 2165 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 2166 kfree_rcu(psf, rcu); 2167 return err; 2168 } 2169 2170 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 2171 { 2172 struct inet_sock *inet = inet_sk(sk); 2173 struct ip_mc_socklist *iml; 2174 struct ip_mc_socklist __rcu **imlp; 2175 struct in_device *in_dev; 2176 struct net *net = sock_net(sk); 2177 __be32 group = imr->imr_multiaddr.s_addr; 2178 u32 ifindex; 2179 int ret = -EADDRNOTAVAIL; 2180 2181 ASSERT_RTNL(); 2182 2183 in_dev = ip_mc_find_dev(net, imr); 2184 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { 2185 ret = -ENODEV; 2186 goto out; 2187 } 2188 ifindex = imr->imr_ifindex; 2189 for (imlp = &inet->mc_list; 2190 (iml = rtnl_dereference(*imlp)) != NULL; 2191 imlp = &iml->next_rcu) { 2192 if (iml->multi.imr_multiaddr.s_addr != group) 2193 continue; 2194 if (ifindex) { 2195 if (iml->multi.imr_ifindex != ifindex) 2196 continue; 2197 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 2198 iml->multi.imr_address.s_addr) 2199 continue; 2200 2201 (void) ip_mc_leave_src(sk, iml, in_dev); 2202 2203 *imlp = iml->next_rcu; 2204 2205 if (in_dev) 2206 ip_mc_dec_group(in_dev, group); 2207 2208 /* decrease mem now to avoid the memleak warning */ 2209 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2210 kfree_rcu(iml, rcu); 2211 return 0; 2212 } 2213 out: 2214 return ret; 2215 } 2216 EXPORT_SYMBOL(ip_mc_leave_group); 2217 2218 int ip_mc_source(int add, int omode, struct sock *sk, struct 2219 ip_mreq_source *mreqs, int ifindex) 2220 { 2221 int err; 2222 struct ip_mreqn imr; 2223 __be32 addr = mreqs->imr_multiaddr; 2224 struct ip_mc_socklist *pmc; 2225 struct in_device *in_dev = NULL; 2226 struct inet_sock *inet = inet_sk(sk); 2227 struct ip_sf_socklist *psl; 2228 struct net *net = sock_net(sk); 2229 int leavegroup = 0; 2230 int i, j, rv; 2231 2232 if (!ipv4_is_multicast(addr)) 2233 return -EINVAL; 2234 2235 ASSERT_RTNL(); 2236 2237 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2238 imr.imr_address.s_addr = mreqs->imr_interface; 2239 imr.imr_ifindex = ifindex; 2240 in_dev = ip_mc_find_dev(net, &imr); 2241 2242 if (!in_dev) { 2243 err = -ENODEV; 2244 goto done; 2245 } 2246 err = -EADDRNOTAVAIL; 2247 2248 for_each_pmc_rtnl(inet, pmc) { 2249 if ((pmc->multi.imr_multiaddr.s_addr == 2250 imr.imr_multiaddr.s_addr) && 2251 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2252 break; 2253 } 2254 if (!pmc) { /* must have a prior join */ 2255 err = -EINVAL; 2256 goto done; 2257 } 2258 /* if a source filter was set, must be the same mode as before */ 2259 if (pmc->sflist) { 2260 if (pmc->sfmode != omode) { 2261 err = -EINVAL; 2262 goto done; 2263 } 2264 } else if (pmc->sfmode != omode) { 2265 /* allow mode switches for empty-set filters */ 2266 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2267 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2268 NULL, 0); 2269 pmc->sfmode = omode; 2270 } 2271 2272 psl = rtnl_dereference(pmc->sflist); 2273 if (!add) { 2274 if (!psl) 2275 goto done; /* err = -EADDRNOTAVAIL */ 2276 rv = !0; 2277 for (i = 0; i < psl->sl_count; i++) { 2278 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2279 sizeof(__be32)); 2280 if (rv == 0) 2281 break; 2282 } 2283 if (rv) /* source not found */ 2284 goto done; /* err = -EADDRNOTAVAIL */ 2285 2286 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2287 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2288 leavegroup = 1; 2289 goto done; 2290 } 2291 2292 /* update the interface filter */ 2293 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2294 &mreqs->imr_sourceaddr, 1); 2295 2296 for (j = i+1; j < psl->sl_count; j++) 2297 psl->sl_addr[j-1] = psl->sl_addr[j]; 2298 psl->sl_count--; 2299 err = 0; 2300 goto done; 2301 } 2302 /* else, add a new source to the filter */ 2303 2304 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { 2305 err = -ENOBUFS; 2306 goto done; 2307 } 2308 if (!psl || psl->sl_count == psl->sl_max) { 2309 struct ip_sf_socklist *newpsl; 2310 int count = IP_SFBLOCK; 2311 2312 if (psl) 2313 count += psl->sl_max; 2314 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2315 if (!newpsl) { 2316 err = -ENOBUFS; 2317 goto done; 2318 } 2319 newpsl->sl_max = count; 2320 newpsl->sl_count = count - IP_SFBLOCK; 2321 if (psl) { 2322 for (i = 0; i < psl->sl_count; i++) 2323 newpsl->sl_addr[i] = psl->sl_addr[i]; 2324 /* decrease mem now to avoid the memleak warning */ 2325 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2326 kfree_rcu(psl, rcu); 2327 } 2328 rcu_assign_pointer(pmc->sflist, newpsl); 2329 psl = newpsl; 2330 } 2331 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2332 for (i = 0; i < psl->sl_count; i++) { 2333 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2334 sizeof(__be32)); 2335 if (rv == 0) 2336 break; 2337 } 2338 if (rv == 0) /* address already there is an error */ 2339 goto done; 2340 for (j = psl->sl_count-1; j >= i; j--) 2341 psl->sl_addr[j+1] = psl->sl_addr[j]; 2342 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2343 psl->sl_count++; 2344 err = 0; 2345 /* update the interface list */ 2346 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2347 &mreqs->imr_sourceaddr, 1); 2348 done: 2349 if (leavegroup) 2350 err = ip_mc_leave_group(sk, &imr); 2351 return err; 2352 } 2353 2354 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2355 { 2356 int err = 0; 2357 struct ip_mreqn imr; 2358 __be32 addr = msf->imsf_multiaddr; 2359 struct ip_mc_socklist *pmc; 2360 struct in_device *in_dev; 2361 struct inet_sock *inet = inet_sk(sk); 2362 struct ip_sf_socklist *newpsl, *psl; 2363 struct net *net = sock_net(sk); 2364 int leavegroup = 0; 2365 2366 if (!ipv4_is_multicast(addr)) 2367 return -EINVAL; 2368 if (msf->imsf_fmode != MCAST_INCLUDE && 2369 msf->imsf_fmode != MCAST_EXCLUDE) 2370 return -EINVAL; 2371 2372 ASSERT_RTNL(); 2373 2374 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2375 imr.imr_address.s_addr = msf->imsf_interface; 2376 imr.imr_ifindex = ifindex; 2377 in_dev = ip_mc_find_dev(net, &imr); 2378 2379 if (!in_dev) { 2380 err = -ENODEV; 2381 goto done; 2382 } 2383 2384 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2385 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2386 leavegroup = 1; 2387 goto done; 2388 } 2389 2390 for_each_pmc_rtnl(inet, pmc) { 2391 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2392 pmc->multi.imr_ifindex == imr.imr_ifindex) 2393 break; 2394 } 2395 if (!pmc) { /* must have a prior join */ 2396 err = -EINVAL; 2397 goto done; 2398 } 2399 if (msf->imsf_numsrc) { 2400 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2401 GFP_KERNEL); 2402 if (!newpsl) { 2403 err = -ENOBUFS; 2404 goto done; 2405 } 2406 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2407 memcpy(newpsl->sl_addr, msf->imsf_slist, 2408 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2409 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2410 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2411 if (err) { 2412 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2413 goto done; 2414 } 2415 } else { 2416 newpsl = NULL; 2417 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2418 msf->imsf_fmode, 0, NULL, 0); 2419 } 2420 psl = rtnl_dereference(pmc->sflist); 2421 if (psl) { 2422 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2423 psl->sl_count, psl->sl_addr, 0); 2424 /* decrease mem now to avoid the memleak warning */ 2425 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2426 kfree_rcu(psl, rcu); 2427 } else 2428 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2429 0, NULL, 0); 2430 rcu_assign_pointer(pmc->sflist, newpsl); 2431 pmc->sfmode = msf->imsf_fmode; 2432 err = 0; 2433 done: 2434 if (leavegroup) 2435 err = ip_mc_leave_group(sk, &imr); 2436 return err; 2437 } 2438 2439 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2440 struct ip_msfilter __user *optval, int __user *optlen) 2441 { 2442 int err, len, count, copycount; 2443 struct ip_mreqn imr; 2444 __be32 addr = msf->imsf_multiaddr; 2445 struct ip_mc_socklist *pmc; 2446 struct in_device *in_dev; 2447 struct inet_sock *inet = inet_sk(sk); 2448 struct ip_sf_socklist *psl; 2449 struct net *net = sock_net(sk); 2450 2451 ASSERT_RTNL(); 2452 2453 if (!ipv4_is_multicast(addr)) 2454 return -EINVAL; 2455 2456 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2457 imr.imr_address.s_addr = msf->imsf_interface; 2458 imr.imr_ifindex = 0; 2459 in_dev = ip_mc_find_dev(net, &imr); 2460 2461 if (!in_dev) { 2462 err = -ENODEV; 2463 goto done; 2464 } 2465 err = -EADDRNOTAVAIL; 2466 2467 for_each_pmc_rtnl(inet, pmc) { 2468 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2469 pmc->multi.imr_ifindex == imr.imr_ifindex) 2470 break; 2471 } 2472 if (!pmc) /* must have a prior join */ 2473 goto done; 2474 msf->imsf_fmode = pmc->sfmode; 2475 psl = rtnl_dereference(pmc->sflist); 2476 if (!psl) { 2477 len = 0; 2478 count = 0; 2479 } else { 2480 count = psl->sl_count; 2481 } 2482 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2483 len = copycount * sizeof(psl->sl_addr[0]); 2484 msf->imsf_numsrc = count; 2485 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2486 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2487 return -EFAULT; 2488 } 2489 if (len && 2490 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2491 return -EFAULT; 2492 return 0; 2493 done: 2494 return err; 2495 } 2496 2497 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2498 struct group_filter __user *optval, int __user *optlen) 2499 { 2500 int err, i, count, copycount; 2501 struct sockaddr_in *psin; 2502 __be32 addr; 2503 struct ip_mc_socklist *pmc; 2504 struct inet_sock *inet = inet_sk(sk); 2505 struct ip_sf_socklist *psl; 2506 2507 ASSERT_RTNL(); 2508 2509 psin = (struct sockaddr_in *)&gsf->gf_group; 2510 if (psin->sin_family != AF_INET) 2511 return -EINVAL; 2512 addr = psin->sin_addr.s_addr; 2513 if (!ipv4_is_multicast(addr)) 2514 return -EINVAL; 2515 2516 err = -EADDRNOTAVAIL; 2517 2518 for_each_pmc_rtnl(inet, pmc) { 2519 if (pmc->multi.imr_multiaddr.s_addr == addr && 2520 pmc->multi.imr_ifindex == gsf->gf_interface) 2521 break; 2522 } 2523 if (!pmc) /* must have a prior join */ 2524 goto done; 2525 gsf->gf_fmode = pmc->sfmode; 2526 psl = rtnl_dereference(pmc->sflist); 2527 count = psl ? psl->sl_count : 0; 2528 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2529 gsf->gf_numsrc = count; 2530 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2531 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2532 return -EFAULT; 2533 } 2534 for (i = 0; i < copycount; i++) { 2535 struct sockaddr_storage ss; 2536 2537 psin = (struct sockaddr_in *)&ss; 2538 memset(&ss, 0, sizeof(ss)); 2539 psin->sin_family = AF_INET; 2540 psin->sin_addr.s_addr = psl->sl_addr[i]; 2541 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2542 return -EFAULT; 2543 } 2544 return 0; 2545 done: 2546 return err; 2547 } 2548 2549 /* 2550 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2551 */ 2552 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2553 { 2554 struct inet_sock *inet = inet_sk(sk); 2555 struct ip_mc_socklist *pmc; 2556 struct ip_sf_socklist *psl; 2557 int i; 2558 int ret; 2559 2560 ret = 1; 2561 if (!ipv4_is_multicast(loc_addr)) 2562 goto out; 2563 2564 rcu_read_lock(); 2565 for_each_pmc_rcu(inet, pmc) { 2566 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2567 pmc->multi.imr_ifindex == dif) 2568 break; 2569 } 2570 ret = inet->mc_all; 2571 if (!pmc) 2572 goto unlock; 2573 psl = rcu_dereference(pmc->sflist); 2574 ret = (pmc->sfmode == MCAST_EXCLUDE); 2575 if (!psl) 2576 goto unlock; 2577 2578 for (i = 0; i < psl->sl_count; i++) { 2579 if (psl->sl_addr[i] == rmt_addr) 2580 break; 2581 } 2582 ret = 0; 2583 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2584 goto unlock; 2585 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2586 goto unlock; 2587 ret = 1; 2588 unlock: 2589 rcu_read_unlock(); 2590 out: 2591 return ret; 2592 } 2593 2594 /* 2595 * A socket is closing. 2596 */ 2597 2598 void ip_mc_drop_socket(struct sock *sk) 2599 { 2600 struct inet_sock *inet = inet_sk(sk); 2601 struct ip_mc_socklist *iml; 2602 struct net *net = sock_net(sk); 2603 2604 if (!inet->mc_list) 2605 return; 2606 2607 rtnl_lock(); 2608 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2609 struct in_device *in_dev; 2610 2611 inet->mc_list = iml->next_rcu; 2612 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2613 (void) ip_mc_leave_src(sk, iml, in_dev); 2614 if (in_dev) 2615 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2616 /* decrease mem now to avoid the memleak warning */ 2617 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2618 kfree_rcu(iml, rcu); 2619 } 2620 rtnl_unlock(); 2621 } 2622 2623 /* called with rcu_read_lock() */ 2624 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) 2625 { 2626 struct ip_mc_list *im; 2627 struct ip_mc_list __rcu **mc_hash; 2628 struct ip_sf_list *psf; 2629 int rv = 0; 2630 2631 mc_hash = rcu_dereference(in_dev->mc_hash); 2632 if (mc_hash) { 2633 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2634 2635 for (im = rcu_dereference(mc_hash[hash]); 2636 im != NULL; 2637 im = rcu_dereference(im->next_hash)) { 2638 if (im->multiaddr == mc_addr) 2639 break; 2640 } 2641 } else { 2642 for_each_pmc_rcu(in_dev, im) { 2643 if (im->multiaddr == mc_addr) 2644 break; 2645 } 2646 } 2647 if (im && proto == IPPROTO_IGMP) { 2648 rv = 1; 2649 } else if (im) { 2650 if (src_addr) { 2651 for (psf = im->sources; psf; psf = psf->sf_next) { 2652 if (psf->sf_inaddr == src_addr) 2653 break; 2654 } 2655 if (psf) 2656 rv = psf->sf_count[MCAST_INCLUDE] || 2657 psf->sf_count[MCAST_EXCLUDE] != 2658 im->sfcount[MCAST_EXCLUDE]; 2659 else 2660 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2661 } else 2662 rv = 1; /* unspecified source; tentatively allow */ 2663 } 2664 return rv; 2665 } 2666 2667 #if defined(CONFIG_PROC_FS) 2668 struct igmp_mc_iter_state { 2669 struct seq_net_private p; 2670 struct net_device *dev; 2671 struct in_device *in_dev; 2672 }; 2673 2674 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2675 2676 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2677 { 2678 struct net *net = seq_file_net(seq); 2679 struct ip_mc_list *im = NULL; 2680 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2681 2682 state->in_dev = NULL; 2683 for_each_netdev_rcu(net, state->dev) { 2684 struct in_device *in_dev; 2685 2686 in_dev = __in_dev_get_rcu(state->dev); 2687 if (!in_dev) 2688 continue; 2689 im = rcu_dereference(in_dev->mc_list); 2690 if (im) { 2691 state->in_dev = in_dev; 2692 break; 2693 } 2694 } 2695 return im; 2696 } 2697 2698 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2699 { 2700 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2701 2702 im = rcu_dereference(im->next_rcu); 2703 while (!im) { 2704 state->dev = next_net_device_rcu(state->dev); 2705 if (!state->dev) { 2706 state->in_dev = NULL; 2707 break; 2708 } 2709 state->in_dev = __in_dev_get_rcu(state->dev); 2710 if (!state->in_dev) 2711 continue; 2712 im = rcu_dereference(state->in_dev->mc_list); 2713 } 2714 return im; 2715 } 2716 2717 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2718 { 2719 struct ip_mc_list *im = igmp_mc_get_first(seq); 2720 if (im) 2721 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2722 --pos; 2723 return pos ? NULL : im; 2724 } 2725 2726 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2727 __acquires(rcu) 2728 { 2729 rcu_read_lock(); 2730 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2731 } 2732 2733 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2734 { 2735 struct ip_mc_list *im; 2736 if (v == SEQ_START_TOKEN) 2737 im = igmp_mc_get_first(seq); 2738 else 2739 im = igmp_mc_get_next(seq, v); 2740 ++*pos; 2741 return im; 2742 } 2743 2744 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2745 __releases(rcu) 2746 { 2747 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2748 2749 state->in_dev = NULL; 2750 state->dev = NULL; 2751 rcu_read_unlock(); 2752 } 2753 2754 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2755 { 2756 if (v == SEQ_START_TOKEN) 2757 seq_puts(seq, 2758 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2759 else { 2760 struct ip_mc_list *im = (struct ip_mc_list *)v; 2761 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2762 char *querier; 2763 long delta; 2764 2765 #ifdef CONFIG_IP_MULTICAST 2766 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2767 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2768 "V3"; 2769 #else 2770 querier = "NONE"; 2771 #endif 2772 2773 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2774 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2775 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2776 } 2777 2778 delta = im->timer.expires - jiffies; 2779 seq_printf(seq, 2780 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2781 im->multiaddr, im->users, 2782 im->tm_running, 2783 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2784 im->reporter); 2785 } 2786 return 0; 2787 } 2788 2789 static const struct seq_operations igmp_mc_seq_ops = { 2790 .start = igmp_mc_seq_start, 2791 .next = igmp_mc_seq_next, 2792 .stop = igmp_mc_seq_stop, 2793 .show = igmp_mc_seq_show, 2794 }; 2795 2796 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2797 { 2798 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2799 sizeof(struct igmp_mc_iter_state)); 2800 } 2801 2802 static const struct file_operations igmp_mc_seq_fops = { 2803 .owner = THIS_MODULE, 2804 .open = igmp_mc_seq_open, 2805 .read = seq_read, 2806 .llseek = seq_lseek, 2807 .release = seq_release_net, 2808 }; 2809 2810 struct igmp_mcf_iter_state { 2811 struct seq_net_private p; 2812 struct net_device *dev; 2813 struct in_device *idev; 2814 struct ip_mc_list *im; 2815 }; 2816 2817 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2818 2819 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2820 { 2821 struct net *net = seq_file_net(seq); 2822 struct ip_sf_list *psf = NULL; 2823 struct ip_mc_list *im = NULL; 2824 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2825 2826 state->idev = NULL; 2827 state->im = NULL; 2828 for_each_netdev_rcu(net, state->dev) { 2829 struct in_device *idev; 2830 idev = __in_dev_get_rcu(state->dev); 2831 if (unlikely(!idev)) 2832 continue; 2833 im = rcu_dereference(idev->mc_list); 2834 if (likely(im)) { 2835 spin_lock_bh(&im->lock); 2836 psf = im->sources; 2837 if (likely(psf)) { 2838 state->im = im; 2839 state->idev = idev; 2840 break; 2841 } 2842 spin_unlock_bh(&im->lock); 2843 } 2844 } 2845 return psf; 2846 } 2847 2848 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2849 { 2850 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2851 2852 psf = psf->sf_next; 2853 while (!psf) { 2854 spin_unlock_bh(&state->im->lock); 2855 state->im = state->im->next; 2856 while (!state->im) { 2857 state->dev = next_net_device_rcu(state->dev); 2858 if (!state->dev) { 2859 state->idev = NULL; 2860 goto out; 2861 } 2862 state->idev = __in_dev_get_rcu(state->dev); 2863 if (!state->idev) 2864 continue; 2865 state->im = rcu_dereference(state->idev->mc_list); 2866 } 2867 if (!state->im) 2868 break; 2869 spin_lock_bh(&state->im->lock); 2870 psf = state->im->sources; 2871 } 2872 out: 2873 return psf; 2874 } 2875 2876 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2877 { 2878 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2879 if (psf) 2880 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2881 --pos; 2882 return pos ? NULL : psf; 2883 } 2884 2885 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2886 __acquires(rcu) 2887 { 2888 rcu_read_lock(); 2889 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2890 } 2891 2892 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2893 { 2894 struct ip_sf_list *psf; 2895 if (v == SEQ_START_TOKEN) 2896 psf = igmp_mcf_get_first(seq); 2897 else 2898 psf = igmp_mcf_get_next(seq, v); 2899 ++*pos; 2900 return psf; 2901 } 2902 2903 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2904 __releases(rcu) 2905 { 2906 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2907 if (likely(state->im)) { 2908 spin_unlock_bh(&state->im->lock); 2909 state->im = NULL; 2910 } 2911 state->idev = NULL; 2912 state->dev = NULL; 2913 rcu_read_unlock(); 2914 } 2915 2916 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2917 { 2918 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2919 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2920 2921 if (v == SEQ_START_TOKEN) { 2922 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2923 } else { 2924 seq_printf(seq, 2925 "%3d %6.6s 0x%08x " 2926 "0x%08x %6lu %6lu\n", 2927 state->dev->ifindex, state->dev->name, 2928 ntohl(state->im->multiaddr), 2929 ntohl(psf->sf_inaddr), 2930 psf->sf_count[MCAST_INCLUDE], 2931 psf->sf_count[MCAST_EXCLUDE]); 2932 } 2933 return 0; 2934 } 2935 2936 static const struct seq_operations igmp_mcf_seq_ops = { 2937 .start = igmp_mcf_seq_start, 2938 .next = igmp_mcf_seq_next, 2939 .stop = igmp_mcf_seq_stop, 2940 .show = igmp_mcf_seq_show, 2941 }; 2942 2943 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2944 { 2945 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2946 sizeof(struct igmp_mcf_iter_state)); 2947 } 2948 2949 static const struct file_operations igmp_mcf_seq_fops = { 2950 .owner = THIS_MODULE, 2951 .open = igmp_mcf_seq_open, 2952 .read = seq_read, 2953 .llseek = seq_lseek, 2954 .release = seq_release_net, 2955 }; 2956 2957 static int __net_init igmp_net_init(struct net *net) 2958 { 2959 struct proc_dir_entry *pde; 2960 int err; 2961 2962 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); 2963 if (!pde) 2964 goto out_igmp; 2965 pde = proc_create("mcfilter", S_IRUGO, net->proc_net, 2966 &igmp_mcf_seq_fops); 2967 if (!pde) 2968 goto out_mcfilter; 2969 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, 2970 SOCK_DGRAM, 0, net); 2971 if (err < 0) { 2972 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", 2973 err); 2974 goto out_sock; 2975 } 2976 2977 /* Sysctl initialization */ 2978 net->ipv4.sysctl_igmp_max_memberships = 20; 2979 net->ipv4.sysctl_igmp_max_msf = 10; 2980 /* IGMP reports for link-local multicast groups are enabled by default */ 2981 net->ipv4.sysctl_igmp_llm_reports = 1; 2982 net->ipv4.sysctl_igmp_qrv = 2; 2983 return 0; 2984 2985 out_sock: 2986 remove_proc_entry("mcfilter", net->proc_net); 2987 out_mcfilter: 2988 remove_proc_entry("igmp", net->proc_net); 2989 out_igmp: 2990 return -ENOMEM; 2991 } 2992 2993 static void __net_exit igmp_net_exit(struct net *net) 2994 { 2995 remove_proc_entry("mcfilter", net->proc_net); 2996 remove_proc_entry("igmp", net->proc_net); 2997 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); 2998 } 2999 3000 static struct pernet_operations igmp_net_ops = { 3001 .init = igmp_net_init, 3002 .exit = igmp_net_exit, 3003 }; 3004 #endif 3005 3006 static int igmp_netdev_event(struct notifier_block *this, 3007 unsigned long event, void *ptr) 3008 { 3009 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3010 struct in_device *in_dev; 3011 3012 switch (event) { 3013 case NETDEV_RESEND_IGMP: 3014 in_dev = __in_dev_get_rtnl(dev); 3015 if (in_dev) 3016 ip_mc_rejoin_groups(in_dev); 3017 break; 3018 default: 3019 break; 3020 } 3021 return NOTIFY_DONE; 3022 } 3023 3024 static struct notifier_block igmp_notifier = { 3025 .notifier_call = igmp_netdev_event, 3026 }; 3027 3028 int __init igmp_mc_init(void) 3029 { 3030 #if defined(CONFIG_PROC_FS) 3031 int err; 3032 3033 err = register_pernet_subsys(&igmp_net_ops); 3034 if (err) 3035 return err; 3036 err = register_netdevice_notifier(&igmp_notifier); 3037 if (err) 3038 goto reg_notif_fail; 3039 return 0; 3040 3041 reg_notif_fail: 3042 unregister_pernet_subsys(&igmp_net_ops); 3043 return err; 3044 #else 3045 return register_netdevice_notifier(&igmp_notifier); 3046 #endif 3047 } 3048