1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux NET3: Internet Group Management Protocol [IGMP] 4 * 5 * This code implements the IGMP protocol as defined in RFC1112. There has 6 * been a further revision of this protocol since which is now supported. 7 * 8 * If you have trouble with this module be careful what gcc you have used, 9 * the older version didn't come out right using gcc 2.5.8, the newer one 10 * seems to fall out with gcc 2.6.2. 11 * 12 * Authors: 13 * Alan Cox <alan@lxorguk.ukuu.org.uk> 14 * 15 * Fixes: 16 * 17 * Alan Cox : Added lots of __inline__ to optimise 18 * the memory usage of all the tiny little 19 * functions. 20 * Alan Cox : Dumped the header building experiment. 21 * Alan Cox : Minor tweaks ready for multicast routing 22 * and extended IGMP protocol. 23 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 24 * writes utterly bogus code otherwise (sigh) 25 * fixed IGMP loopback to behave in the manner 26 * desired by mrouted, fixed the fact it has been 27 * broken since 1.3.6 and cleaned up a few minor 28 * points. 29 * 30 * Chih-Jen Chang : Tried to revise IGMP to Version 2 31 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 32 * The enhancements are mainly based on Steve Deering's 33 * ipmulti-3.5 source code. 34 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 35 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 36 * the mrouted version on that device. 37 * Chih-Jen Chang : Added the max_resp_time parameter to 38 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 39 * to identify the multicast router version 40 * and do what the IGMP version 2 specified. 41 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 42 * Tsu-Sheng Tsao if the specified time expired. 43 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 44 * Alan Cox : Use GFP_ATOMIC in the right places. 45 * Christian Daudt : igmp timer wasn't set for local group 46 * memberships but was being deleted, 47 * which caused a "del_timer() called 48 * from %p with timer not initialized\n" 49 * message (960131). 50 * Christian Daudt : removed del_timer from 51 * igmp_timer_expire function (960205). 52 * Christian Daudt : igmp_heard_report now only calls 53 * igmp_timer_expire if tm->running is 54 * true (960216). 55 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 56 * igmp_heard_query never trigger. Expiry 57 * miscalculation fixed in igmp_heard_query 58 * and random() made to return unsigned to 59 * prevent negative expiry times. 60 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 61 * fix from pending 2.1.x patches. 62 * Alan Cox: Forget to enable FDDI support earlier. 63 * Alexey Kuznetsov: Fixed leaving groups on device down. 64 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 65 * David L Stevens: IGMPv3 support, with help from 66 * Vinay Kulkarni 67 */ 68 69 #include <linux/module.h> 70 #include <linux/slab.h> 71 #include <linux/uaccess.h> 72 #include <linux/types.h> 73 #include <linux/kernel.h> 74 #include <linux/jiffies.h> 75 #include <linux/string.h> 76 #include <linux/socket.h> 77 #include <linux/sockios.h> 78 #include <linux/in.h> 79 #include <linux/inet.h> 80 #include <linux/netdevice.h> 81 #include <linux/skbuff.h> 82 #include <linux/inetdevice.h> 83 #include <linux/igmp.h> 84 #include <linux/if_arp.h> 85 #include <linux/rtnetlink.h> 86 #include <linux/times.h> 87 #include <linux/pkt_sched.h> 88 #include <linux/byteorder/generic.h> 89 90 #include <net/net_namespace.h> 91 #include <net/arp.h> 92 #include <net/ip.h> 93 #include <net/protocol.h> 94 #include <net/route.h> 95 #include <net/sock.h> 96 #include <net/checksum.h> 97 #include <net/inet_common.h> 98 #include <linux/netfilter_ipv4.h> 99 #ifdef CONFIG_IP_MROUTE 100 #include <linux/mroute.h> 101 #endif 102 #ifdef CONFIG_PROC_FS 103 #include <linux/proc_fs.h> 104 #include <linux/seq_file.h> 105 #endif 106 107 #ifdef CONFIG_IP_MULTICAST 108 /* Parameter names and values are taken from igmp-v2-06 draft */ 109 110 #define IGMP_QUERY_INTERVAL (125*HZ) 111 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) 112 113 #define IGMP_INITIAL_REPORT_DELAY (1) 114 115 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! 116 * IGMP specs require to report membership immediately after 117 * joining a group, but we delay the first report by a 118 * small interval. It seems more natural and still does not 119 * contradict to specs provided this delay is small enough. 120 */ 121 122 #define IGMP_V1_SEEN(in_dev) \ 123 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 124 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 125 ((in_dev)->mr_v1_seen && \ 126 time_before(jiffies, (in_dev)->mr_v1_seen))) 127 #define IGMP_V2_SEEN(in_dev) \ 128 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 129 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 130 ((in_dev)->mr_v2_seen && \ 131 time_before(jiffies, (in_dev)->mr_v2_seen))) 132 133 static int unsolicited_report_interval(struct in_device *in_dev) 134 { 135 int interval_ms, interval_jiffies; 136 137 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 138 interval_ms = IN_DEV_CONF_GET( 139 in_dev, 140 IGMPV2_UNSOLICITED_REPORT_INTERVAL); 141 else /* v3 */ 142 interval_ms = IN_DEV_CONF_GET( 143 in_dev, 144 IGMPV3_UNSOLICITED_REPORT_INTERVAL); 145 146 interval_jiffies = msecs_to_jiffies(interval_ms); 147 148 /* _timer functions can't handle a delay of 0 jiffies so ensure 149 * we always return a positive value. 150 */ 151 if (interval_jiffies <= 0) 152 interval_jiffies = 1; 153 return interval_jiffies; 154 } 155 156 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, 157 gfp_t gfp); 158 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); 159 static void igmpv3_clear_delrec(struct in_device *in_dev); 160 static int sf_setstate(struct ip_mc_list *pmc); 161 static void sf_markstate(struct ip_mc_list *pmc); 162 #endif 163 static void ip_mc_clear_src(struct ip_mc_list *pmc); 164 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 165 int sfcount, __be32 *psfsrc, int delta); 166 167 static void ip_ma_put(struct ip_mc_list *im) 168 { 169 if (refcount_dec_and_test(&im->refcnt)) { 170 in_dev_put(im->interface); 171 kfree_rcu(im, rcu); 172 } 173 } 174 175 #define for_each_pmc_rcu(in_dev, pmc) \ 176 for (pmc = rcu_dereference(in_dev->mc_list); \ 177 pmc != NULL; \ 178 pmc = rcu_dereference(pmc->next_rcu)) 179 180 #define for_each_pmc_rtnl(in_dev, pmc) \ 181 for (pmc = rtnl_dereference(in_dev->mc_list); \ 182 pmc != NULL; \ 183 pmc = rtnl_dereference(pmc->next_rcu)) 184 185 static void ip_sf_list_clear_all(struct ip_sf_list *psf) 186 { 187 struct ip_sf_list *next; 188 189 while (psf) { 190 next = psf->sf_next; 191 kfree(psf); 192 psf = next; 193 } 194 } 195 196 #ifdef CONFIG_IP_MULTICAST 197 198 /* 199 * Timer management 200 */ 201 202 static void igmp_stop_timer(struct ip_mc_list *im) 203 { 204 spin_lock_bh(&im->lock); 205 if (del_timer(&im->timer)) 206 refcount_dec(&im->refcnt); 207 im->tm_running = 0; 208 im->reporter = 0; 209 im->unsolicit_count = 0; 210 spin_unlock_bh(&im->lock); 211 } 212 213 /* It must be called with locked im->lock */ 214 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 215 { 216 int tv = prandom_u32() % max_delay; 217 218 im->tm_running = 1; 219 if (!mod_timer(&im->timer, jiffies+tv+2)) 220 refcount_inc(&im->refcnt); 221 } 222 223 static void igmp_gq_start_timer(struct in_device *in_dev) 224 { 225 int tv = prandom_u32() % in_dev->mr_maxdelay; 226 unsigned long exp = jiffies + tv + 2; 227 228 if (in_dev->mr_gq_running && 229 time_after_eq(exp, (in_dev->mr_gq_timer).expires)) 230 return; 231 232 in_dev->mr_gq_running = 1; 233 if (!mod_timer(&in_dev->mr_gq_timer, exp)) 234 in_dev_hold(in_dev); 235 } 236 237 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 238 { 239 int tv = prandom_u32() % delay; 240 241 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 242 in_dev_hold(in_dev); 243 } 244 245 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 246 { 247 spin_lock_bh(&im->lock); 248 im->unsolicit_count = 0; 249 if (del_timer(&im->timer)) { 250 if ((long)(im->timer.expires-jiffies) < max_delay) { 251 add_timer(&im->timer); 252 im->tm_running = 1; 253 spin_unlock_bh(&im->lock); 254 return; 255 } 256 refcount_dec(&im->refcnt); 257 } 258 igmp_start_timer(im, max_delay); 259 spin_unlock_bh(&im->lock); 260 } 261 262 263 /* 264 * Send an IGMP report. 265 */ 266 267 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 268 269 270 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 271 int gdeleted, int sdeleted) 272 { 273 switch (type) { 274 case IGMPV3_MODE_IS_INCLUDE: 275 case IGMPV3_MODE_IS_EXCLUDE: 276 if (gdeleted || sdeleted) 277 return 0; 278 if (!(pmc->gsquery && !psf->sf_gsresp)) { 279 if (pmc->sfmode == MCAST_INCLUDE) 280 return 1; 281 /* don't include if this source is excluded 282 * in all filters 283 */ 284 if (psf->sf_count[MCAST_INCLUDE]) 285 return type == IGMPV3_MODE_IS_INCLUDE; 286 return pmc->sfcount[MCAST_EXCLUDE] == 287 psf->sf_count[MCAST_EXCLUDE]; 288 } 289 return 0; 290 case IGMPV3_CHANGE_TO_INCLUDE: 291 if (gdeleted || sdeleted) 292 return 0; 293 return psf->sf_count[MCAST_INCLUDE] != 0; 294 case IGMPV3_CHANGE_TO_EXCLUDE: 295 if (gdeleted || sdeleted) 296 return 0; 297 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 298 psf->sf_count[MCAST_INCLUDE]) 299 return 0; 300 return pmc->sfcount[MCAST_EXCLUDE] == 301 psf->sf_count[MCAST_EXCLUDE]; 302 case IGMPV3_ALLOW_NEW_SOURCES: 303 if (gdeleted || !psf->sf_crcount) 304 return 0; 305 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 306 case IGMPV3_BLOCK_OLD_SOURCES: 307 if (pmc->sfmode == MCAST_INCLUDE) 308 return gdeleted || (psf->sf_crcount && sdeleted); 309 return psf->sf_crcount && !gdeleted && !sdeleted; 310 } 311 return 0; 312 } 313 314 static int 315 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 316 { 317 struct ip_sf_list *psf; 318 int scount = 0; 319 320 for (psf = pmc->sources; psf; psf = psf->sf_next) { 321 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 322 continue; 323 scount++; 324 } 325 return scount; 326 } 327 328 /* source address selection per RFC 3376 section 4.2.13 */ 329 static __be32 igmpv3_get_srcaddr(struct net_device *dev, 330 const struct flowi4 *fl4) 331 { 332 struct in_device *in_dev = __in_dev_get_rcu(dev); 333 const struct in_ifaddr *ifa; 334 335 if (!in_dev) 336 return htonl(INADDR_ANY); 337 338 in_dev_for_each_ifa_rcu(ifa, in_dev) { 339 if (fl4->saddr == ifa->ifa_local) 340 return fl4->saddr; 341 } 342 343 return htonl(INADDR_ANY); 344 } 345 346 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) 347 { 348 struct sk_buff *skb; 349 struct rtable *rt; 350 struct iphdr *pip; 351 struct igmpv3_report *pig; 352 struct net *net = dev_net(dev); 353 struct flowi4 fl4; 354 int hlen = LL_RESERVED_SPACE(dev); 355 int tlen = dev->needed_tailroom; 356 unsigned int size = mtu; 357 358 while (1) { 359 skb = alloc_skb(size + hlen + tlen, 360 GFP_ATOMIC | __GFP_NOWARN); 361 if (skb) 362 break; 363 size >>= 1; 364 if (size < 256) 365 return NULL; 366 } 367 skb->priority = TC_PRIO_CONTROL; 368 369 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 370 0, 0, 371 IPPROTO_IGMP, 0, dev->ifindex); 372 if (IS_ERR(rt)) { 373 kfree_skb(skb); 374 return NULL; 375 } 376 377 skb_dst_set(skb, &rt->dst); 378 skb->dev = dev; 379 380 skb_reserve(skb, hlen); 381 skb_tailroom_reserve(skb, mtu, tlen); 382 383 skb_reset_network_header(skb); 384 pip = ip_hdr(skb); 385 skb_put(skb, sizeof(struct iphdr) + 4); 386 387 pip->version = 4; 388 pip->ihl = (sizeof(struct iphdr)+4)>>2; 389 pip->tos = 0xc0; 390 pip->frag_off = htons(IP_DF); 391 pip->ttl = 1; 392 pip->daddr = fl4.daddr; 393 394 rcu_read_lock(); 395 pip->saddr = igmpv3_get_srcaddr(dev, &fl4); 396 rcu_read_unlock(); 397 398 pip->protocol = IPPROTO_IGMP; 399 pip->tot_len = 0; /* filled in later */ 400 ip_select_ident(net, skb, NULL); 401 ((u8 *)&pip[1])[0] = IPOPT_RA; 402 ((u8 *)&pip[1])[1] = 4; 403 ((u8 *)&pip[1])[2] = 0; 404 ((u8 *)&pip[1])[3] = 0; 405 406 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 407 skb_put(skb, sizeof(*pig)); 408 pig = igmpv3_report_hdr(skb); 409 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 410 pig->resv1 = 0; 411 pig->csum = 0; 412 pig->resv2 = 0; 413 pig->ngrec = 0; 414 return skb; 415 } 416 417 static int igmpv3_sendpack(struct sk_buff *skb) 418 { 419 struct igmphdr *pig = igmp_hdr(skb); 420 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); 421 422 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 423 424 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 425 } 426 427 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 428 { 429 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 430 } 431 432 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 433 int type, struct igmpv3_grec **ppgr, unsigned int mtu) 434 { 435 struct net_device *dev = pmc->interface->dev; 436 struct igmpv3_report *pih; 437 struct igmpv3_grec *pgr; 438 439 if (!skb) { 440 skb = igmpv3_newpack(dev, mtu); 441 if (!skb) 442 return NULL; 443 } 444 pgr = skb_put(skb, sizeof(struct igmpv3_grec)); 445 pgr->grec_type = type; 446 pgr->grec_auxwords = 0; 447 pgr->grec_nsrcs = 0; 448 pgr->grec_mca = pmc->multiaddr; 449 pih = igmpv3_report_hdr(skb); 450 pih->ngrec = htons(ntohs(pih->ngrec)+1); 451 *ppgr = pgr; 452 return skb; 453 } 454 455 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 456 457 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 458 int type, int gdeleted, int sdeleted) 459 { 460 struct net_device *dev = pmc->interface->dev; 461 struct net *net = dev_net(dev); 462 struct igmpv3_report *pih; 463 struct igmpv3_grec *pgr = NULL; 464 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 465 int scount, stotal, first, isquery, truncate; 466 unsigned int mtu; 467 468 if (pmc->multiaddr == IGMP_ALL_HOSTS) 469 return skb; 470 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 471 return skb; 472 473 mtu = READ_ONCE(dev->mtu); 474 if (mtu < IPV4_MIN_MTU) 475 return skb; 476 477 isquery = type == IGMPV3_MODE_IS_INCLUDE || 478 type == IGMPV3_MODE_IS_EXCLUDE; 479 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 480 type == IGMPV3_CHANGE_TO_EXCLUDE; 481 482 stotal = scount = 0; 483 484 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 485 486 if (!*psf_list) 487 goto empty_source; 488 489 pih = skb ? igmpv3_report_hdr(skb) : NULL; 490 491 /* EX and TO_EX get a fresh packet, if needed */ 492 if (truncate) { 493 if (pih && pih->ngrec && 494 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 495 if (skb) 496 igmpv3_sendpack(skb); 497 skb = igmpv3_newpack(dev, mtu); 498 } 499 } 500 first = 1; 501 psf_prev = NULL; 502 for (psf = *psf_list; psf; psf = psf_next) { 503 __be32 *psrc; 504 505 psf_next = psf->sf_next; 506 507 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 508 psf_prev = psf; 509 continue; 510 } 511 512 /* Based on RFC3376 5.1. Should not send source-list change 513 * records when there is a filter mode change. 514 */ 515 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || 516 (!gdeleted && pmc->crcount)) && 517 (type == IGMPV3_ALLOW_NEW_SOURCES || 518 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) 519 goto decrease_sf_crcount; 520 521 /* clear marks on query responses */ 522 if (isquery) 523 psf->sf_gsresp = 0; 524 525 if (AVAILABLE(skb) < sizeof(__be32) + 526 first*sizeof(struct igmpv3_grec)) { 527 if (truncate && !first) 528 break; /* truncate these */ 529 if (pgr) 530 pgr->grec_nsrcs = htons(scount); 531 if (skb) 532 igmpv3_sendpack(skb); 533 skb = igmpv3_newpack(dev, mtu); 534 first = 1; 535 scount = 0; 536 } 537 if (first) { 538 skb = add_grhead(skb, pmc, type, &pgr, mtu); 539 first = 0; 540 } 541 if (!skb) 542 return NULL; 543 psrc = skb_put(skb, sizeof(__be32)); 544 *psrc = psf->sf_inaddr; 545 scount++; stotal++; 546 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 547 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 548 decrease_sf_crcount: 549 psf->sf_crcount--; 550 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 551 if (psf_prev) 552 psf_prev->sf_next = psf->sf_next; 553 else 554 *psf_list = psf->sf_next; 555 kfree(psf); 556 continue; 557 } 558 } 559 psf_prev = psf; 560 } 561 562 empty_source: 563 if (!stotal) { 564 if (type == IGMPV3_ALLOW_NEW_SOURCES || 565 type == IGMPV3_BLOCK_OLD_SOURCES) 566 return skb; 567 if (pmc->crcount || isquery) { 568 /* make sure we have room for group header */ 569 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { 570 igmpv3_sendpack(skb); 571 skb = NULL; /* add_grhead will get a new one */ 572 } 573 skb = add_grhead(skb, pmc, type, &pgr, mtu); 574 } 575 } 576 if (pgr) 577 pgr->grec_nsrcs = htons(scount); 578 579 if (isquery) 580 pmc->gsquery = 0; /* clear query state on report */ 581 return skb; 582 } 583 584 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 585 { 586 struct sk_buff *skb = NULL; 587 struct net *net = dev_net(in_dev->dev); 588 int type; 589 590 if (!pmc) { 591 rcu_read_lock(); 592 for_each_pmc_rcu(in_dev, pmc) { 593 if (pmc->multiaddr == IGMP_ALL_HOSTS) 594 continue; 595 if (ipv4_is_local_multicast(pmc->multiaddr) && 596 !net->ipv4.sysctl_igmp_llm_reports) 597 continue; 598 spin_lock_bh(&pmc->lock); 599 if (pmc->sfcount[MCAST_EXCLUDE]) 600 type = IGMPV3_MODE_IS_EXCLUDE; 601 else 602 type = IGMPV3_MODE_IS_INCLUDE; 603 skb = add_grec(skb, pmc, type, 0, 0); 604 spin_unlock_bh(&pmc->lock); 605 } 606 rcu_read_unlock(); 607 } else { 608 spin_lock_bh(&pmc->lock); 609 if (pmc->sfcount[MCAST_EXCLUDE]) 610 type = IGMPV3_MODE_IS_EXCLUDE; 611 else 612 type = IGMPV3_MODE_IS_INCLUDE; 613 skb = add_grec(skb, pmc, type, 0, 0); 614 spin_unlock_bh(&pmc->lock); 615 } 616 if (!skb) 617 return 0; 618 return igmpv3_sendpack(skb); 619 } 620 621 /* 622 * remove zero-count source records from a source filter list 623 */ 624 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 625 { 626 struct ip_sf_list *psf_prev, *psf_next, *psf; 627 628 psf_prev = NULL; 629 for (psf = *ppsf; psf; psf = psf_next) { 630 psf_next = psf->sf_next; 631 if (psf->sf_crcount == 0) { 632 if (psf_prev) 633 psf_prev->sf_next = psf->sf_next; 634 else 635 *ppsf = psf->sf_next; 636 kfree(psf); 637 } else 638 psf_prev = psf; 639 } 640 } 641 642 static void kfree_pmc(struct ip_mc_list *pmc) 643 { 644 ip_sf_list_clear_all(pmc->sources); 645 ip_sf_list_clear_all(pmc->tomb); 646 kfree(pmc); 647 } 648 649 static void igmpv3_send_cr(struct in_device *in_dev) 650 { 651 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 652 struct sk_buff *skb = NULL; 653 int type, dtype; 654 655 rcu_read_lock(); 656 spin_lock_bh(&in_dev->mc_tomb_lock); 657 658 /* deleted MCA's */ 659 pmc_prev = NULL; 660 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { 661 pmc_next = pmc->next; 662 if (pmc->sfmode == MCAST_INCLUDE) { 663 type = IGMPV3_BLOCK_OLD_SOURCES; 664 dtype = IGMPV3_BLOCK_OLD_SOURCES; 665 skb = add_grec(skb, pmc, type, 1, 0); 666 skb = add_grec(skb, pmc, dtype, 1, 1); 667 } 668 if (pmc->crcount) { 669 if (pmc->sfmode == MCAST_EXCLUDE) { 670 type = IGMPV3_CHANGE_TO_INCLUDE; 671 skb = add_grec(skb, pmc, type, 1, 0); 672 } 673 pmc->crcount--; 674 if (pmc->crcount == 0) { 675 igmpv3_clear_zeros(&pmc->tomb); 676 igmpv3_clear_zeros(&pmc->sources); 677 } 678 } 679 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 680 if (pmc_prev) 681 pmc_prev->next = pmc_next; 682 else 683 in_dev->mc_tomb = pmc_next; 684 in_dev_put(pmc->interface); 685 kfree_pmc(pmc); 686 } else 687 pmc_prev = pmc; 688 } 689 spin_unlock_bh(&in_dev->mc_tomb_lock); 690 691 /* change recs */ 692 for_each_pmc_rcu(in_dev, pmc) { 693 spin_lock_bh(&pmc->lock); 694 if (pmc->sfcount[MCAST_EXCLUDE]) { 695 type = IGMPV3_BLOCK_OLD_SOURCES; 696 dtype = IGMPV3_ALLOW_NEW_SOURCES; 697 } else { 698 type = IGMPV3_ALLOW_NEW_SOURCES; 699 dtype = IGMPV3_BLOCK_OLD_SOURCES; 700 } 701 skb = add_grec(skb, pmc, type, 0, 0); 702 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 703 704 /* filter mode changes */ 705 if (pmc->crcount) { 706 if (pmc->sfmode == MCAST_EXCLUDE) 707 type = IGMPV3_CHANGE_TO_EXCLUDE; 708 else 709 type = IGMPV3_CHANGE_TO_INCLUDE; 710 skb = add_grec(skb, pmc, type, 0, 0); 711 pmc->crcount--; 712 } 713 spin_unlock_bh(&pmc->lock); 714 } 715 rcu_read_unlock(); 716 717 if (!skb) 718 return; 719 (void) igmpv3_sendpack(skb); 720 } 721 722 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 723 int type) 724 { 725 struct sk_buff *skb; 726 struct iphdr *iph; 727 struct igmphdr *ih; 728 struct rtable *rt; 729 struct net_device *dev = in_dev->dev; 730 struct net *net = dev_net(dev); 731 __be32 group = pmc ? pmc->multiaddr : 0; 732 struct flowi4 fl4; 733 __be32 dst; 734 int hlen, tlen; 735 736 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 737 return igmpv3_send_report(in_dev, pmc); 738 739 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 740 return 0; 741 742 if (type == IGMP_HOST_LEAVE_MESSAGE) 743 dst = IGMP_ALL_ROUTER; 744 else 745 dst = group; 746 747 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 748 0, 0, 749 IPPROTO_IGMP, 0, dev->ifindex); 750 if (IS_ERR(rt)) 751 return -1; 752 753 hlen = LL_RESERVED_SPACE(dev); 754 tlen = dev->needed_tailroom; 755 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 756 if (!skb) { 757 ip_rt_put(rt); 758 return -1; 759 } 760 skb->priority = TC_PRIO_CONTROL; 761 762 skb_dst_set(skb, &rt->dst); 763 764 skb_reserve(skb, hlen); 765 766 skb_reset_network_header(skb); 767 iph = ip_hdr(skb); 768 skb_put(skb, sizeof(struct iphdr) + 4); 769 770 iph->version = 4; 771 iph->ihl = (sizeof(struct iphdr)+4)>>2; 772 iph->tos = 0xc0; 773 iph->frag_off = htons(IP_DF); 774 iph->ttl = 1; 775 iph->daddr = dst; 776 iph->saddr = fl4.saddr; 777 iph->protocol = IPPROTO_IGMP; 778 ip_select_ident(net, skb, NULL); 779 ((u8 *)&iph[1])[0] = IPOPT_RA; 780 ((u8 *)&iph[1])[1] = 4; 781 ((u8 *)&iph[1])[2] = 0; 782 ((u8 *)&iph[1])[3] = 0; 783 784 ih = skb_put(skb, sizeof(struct igmphdr)); 785 ih->type = type; 786 ih->code = 0; 787 ih->csum = 0; 788 ih->group = group; 789 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 790 791 return ip_local_out(net, skb->sk, skb); 792 } 793 794 static void igmp_gq_timer_expire(struct timer_list *t) 795 { 796 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); 797 798 in_dev->mr_gq_running = 0; 799 igmpv3_send_report(in_dev, NULL); 800 in_dev_put(in_dev); 801 } 802 803 static void igmp_ifc_timer_expire(struct timer_list *t) 804 { 805 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); 806 807 igmpv3_send_cr(in_dev); 808 if (in_dev->mr_ifc_count) { 809 in_dev->mr_ifc_count--; 810 igmp_ifc_start_timer(in_dev, 811 unsolicited_report_interval(in_dev)); 812 } 813 in_dev_put(in_dev); 814 } 815 816 static void igmp_ifc_event(struct in_device *in_dev) 817 { 818 struct net *net = dev_net(in_dev->dev); 819 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 820 return; 821 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 822 igmp_ifc_start_timer(in_dev, 1); 823 } 824 825 826 static void igmp_timer_expire(struct timer_list *t) 827 { 828 struct ip_mc_list *im = from_timer(im, t, timer); 829 struct in_device *in_dev = im->interface; 830 831 spin_lock(&im->lock); 832 im->tm_running = 0; 833 834 if (im->unsolicit_count && --im->unsolicit_count) 835 igmp_start_timer(im, unsolicited_report_interval(in_dev)); 836 837 im->reporter = 1; 838 spin_unlock(&im->lock); 839 840 if (IGMP_V1_SEEN(in_dev)) 841 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 842 else if (IGMP_V2_SEEN(in_dev)) 843 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 844 else 845 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 846 847 ip_ma_put(im); 848 } 849 850 /* mark EXCLUDE-mode sources */ 851 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 852 { 853 struct ip_sf_list *psf; 854 int i, scount; 855 856 scount = 0; 857 for (psf = pmc->sources; psf; psf = psf->sf_next) { 858 if (scount == nsrcs) 859 break; 860 for (i = 0; i < nsrcs; i++) { 861 /* skip inactive filters */ 862 if (psf->sf_count[MCAST_INCLUDE] || 863 pmc->sfcount[MCAST_EXCLUDE] != 864 psf->sf_count[MCAST_EXCLUDE]) 865 break; 866 if (srcs[i] == psf->sf_inaddr) { 867 scount++; 868 break; 869 } 870 } 871 } 872 pmc->gsquery = 0; 873 if (scount == nsrcs) /* all sources excluded */ 874 return 0; 875 return 1; 876 } 877 878 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 879 { 880 struct ip_sf_list *psf; 881 int i, scount; 882 883 if (pmc->sfmode == MCAST_EXCLUDE) 884 return igmp_xmarksources(pmc, nsrcs, srcs); 885 886 /* mark INCLUDE-mode sources */ 887 scount = 0; 888 for (psf = pmc->sources; psf; psf = psf->sf_next) { 889 if (scount == nsrcs) 890 break; 891 for (i = 0; i < nsrcs; i++) 892 if (srcs[i] == psf->sf_inaddr) { 893 psf->sf_gsresp = 1; 894 scount++; 895 break; 896 } 897 } 898 if (!scount) { 899 pmc->gsquery = 0; 900 return 0; 901 } 902 pmc->gsquery = 1; 903 return 1; 904 } 905 906 /* return true if packet was dropped */ 907 static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 908 { 909 struct ip_mc_list *im; 910 struct net *net = dev_net(in_dev->dev); 911 912 /* Timers are only set for non-local groups */ 913 914 if (group == IGMP_ALL_HOSTS) 915 return false; 916 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) 917 return false; 918 919 rcu_read_lock(); 920 for_each_pmc_rcu(in_dev, im) { 921 if (im->multiaddr == group) { 922 igmp_stop_timer(im); 923 break; 924 } 925 } 926 rcu_read_unlock(); 927 return false; 928 } 929 930 /* return true if packet was dropped */ 931 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 932 int len) 933 { 934 struct igmphdr *ih = igmp_hdr(skb); 935 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 936 struct ip_mc_list *im; 937 __be32 group = ih->group; 938 int max_delay; 939 int mark = 0; 940 struct net *net = dev_net(in_dev->dev); 941 942 943 if (len == 8) { 944 if (ih->code == 0) { 945 /* Alas, old v1 router presents here. */ 946 947 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 948 in_dev->mr_v1_seen = jiffies + 949 (in_dev->mr_qrv * in_dev->mr_qi) + 950 in_dev->mr_qri; 951 group = 0; 952 } else { 953 /* v2 router present */ 954 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 955 in_dev->mr_v2_seen = jiffies + 956 (in_dev->mr_qrv * in_dev->mr_qi) + 957 in_dev->mr_qri; 958 } 959 /* cancel the interface change timer */ 960 in_dev->mr_ifc_count = 0; 961 if (del_timer(&in_dev->mr_ifc_timer)) 962 __in_dev_put(in_dev); 963 /* clear deleted report items */ 964 igmpv3_clear_delrec(in_dev); 965 } else if (len < 12) { 966 return true; /* ignore bogus packet; freed by caller */ 967 } else if (IGMP_V1_SEEN(in_dev)) { 968 /* This is a v3 query with v1 queriers present */ 969 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 970 group = 0; 971 } else if (IGMP_V2_SEEN(in_dev)) { 972 /* this is a v3 query with v2 queriers present; 973 * Interpretation of the max_delay code is problematic here. 974 * A real v2 host would use ih_code directly, while v3 has a 975 * different encoding. We use the v3 encoding as more likely 976 * to be intended in a v3 query. 977 */ 978 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 979 if (!max_delay) 980 max_delay = 1; /* can't mod w/ 0 */ 981 } else { /* v3 */ 982 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 983 return true; 984 985 ih3 = igmpv3_query_hdr(skb); 986 if (ih3->nsrcs) { 987 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 988 + ntohs(ih3->nsrcs)*sizeof(__be32))) 989 return true; 990 ih3 = igmpv3_query_hdr(skb); 991 } 992 993 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 994 if (!max_delay) 995 max_delay = 1; /* can't mod w/ 0 */ 996 in_dev->mr_maxdelay = max_delay; 997 998 /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently 999 * received value was zero, use the default or statically 1000 * configured value. 1001 */ 1002 in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv; 1003 in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; 1004 1005 /* RFC3376, 8.3. Query Response Interval: 1006 * The number of seconds represented by the [Query Response 1007 * Interval] must be less than the [Query Interval]. 1008 */ 1009 if (in_dev->mr_qri >= in_dev->mr_qi) 1010 in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; 1011 1012 if (!group) { /* general query */ 1013 if (ih3->nsrcs) 1014 return true; /* no sources allowed */ 1015 igmp_gq_start_timer(in_dev); 1016 return false; 1017 } 1018 /* mark sources to include, if group & source-specific */ 1019 mark = ih3->nsrcs != 0; 1020 } 1021 1022 /* 1023 * - Start the timers in all of our membership records 1024 * that the query applies to for the interface on 1025 * which the query arrived excl. those that belong 1026 * to a "local" group (224.0.0.X) 1027 * - For timers already running check if they need to 1028 * be reset. 1029 * - Use the igmp->igmp_code field as the maximum 1030 * delay possible 1031 */ 1032 rcu_read_lock(); 1033 for_each_pmc_rcu(in_dev, im) { 1034 int changed; 1035 1036 if (group && group != im->multiaddr) 1037 continue; 1038 if (im->multiaddr == IGMP_ALL_HOSTS) 1039 continue; 1040 if (ipv4_is_local_multicast(im->multiaddr) && 1041 !net->ipv4.sysctl_igmp_llm_reports) 1042 continue; 1043 spin_lock_bh(&im->lock); 1044 if (im->tm_running) 1045 im->gsquery = im->gsquery && mark; 1046 else 1047 im->gsquery = mark; 1048 changed = !im->gsquery || 1049 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 1050 spin_unlock_bh(&im->lock); 1051 if (changed) 1052 igmp_mod_timer(im, max_delay); 1053 } 1054 rcu_read_unlock(); 1055 return false; 1056 } 1057 1058 /* called in rcu_read_lock() section */ 1059 int igmp_rcv(struct sk_buff *skb) 1060 { 1061 /* This basically follows the spec line by line -- see RFC1112 */ 1062 struct igmphdr *ih; 1063 struct net_device *dev = skb->dev; 1064 struct in_device *in_dev; 1065 int len = skb->len; 1066 bool dropped = true; 1067 1068 if (netif_is_l3_master(dev)) { 1069 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); 1070 if (!dev) 1071 goto drop; 1072 } 1073 1074 in_dev = __in_dev_get_rcu(dev); 1075 if (!in_dev) 1076 goto drop; 1077 1078 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 1079 goto drop; 1080 1081 if (skb_checksum_simple_validate(skb)) 1082 goto drop; 1083 1084 ih = igmp_hdr(skb); 1085 switch (ih->type) { 1086 case IGMP_HOST_MEMBERSHIP_QUERY: 1087 dropped = igmp_heard_query(in_dev, skb, len); 1088 break; 1089 case IGMP_HOST_MEMBERSHIP_REPORT: 1090 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1091 /* Is it our report looped back? */ 1092 if (rt_is_output_route(skb_rtable(skb))) 1093 break; 1094 /* don't rely on MC router hearing unicast reports */ 1095 if (skb->pkt_type == PACKET_MULTICAST || 1096 skb->pkt_type == PACKET_BROADCAST) 1097 dropped = igmp_heard_report(in_dev, ih->group); 1098 break; 1099 case IGMP_PIM: 1100 #ifdef CONFIG_IP_PIMSM_V1 1101 return pim_rcv_v1(skb); 1102 #endif 1103 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1104 case IGMP_DVMRP: 1105 case IGMP_TRACE: 1106 case IGMP_HOST_LEAVE_MESSAGE: 1107 case IGMP_MTRACE: 1108 case IGMP_MTRACE_RESP: 1109 break; 1110 default: 1111 break; 1112 } 1113 1114 drop: 1115 if (dropped) 1116 kfree_skb(skb); 1117 else 1118 consume_skb(skb); 1119 return 0; 1120 } 1121 1122 #endif 1123 1124 1125 /* 1126 * Add a filter to a device 1127 */ 1128 1129 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1130 { 1131 char buf[MAX_ADDR_LEN]; 1132 struct net_device *dev = in_dev->dev; 1133 1134 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1135 We will get multicast token leakage, when IFF_MULTICAST 1136 is changed. This check should be done in ndo_set_rx_mode 1137 routine. Something sort of: 1138 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1139 --ANK 1140 */ 1141 if (arp_mc_map(addr, buf, dev, 0) == 0) 1142 dev_mc_add(dev, buf); 1143 } 1144 1145 /* 1146 * Remove a filter from a device 1147 */ 1148 1149 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1150 { 1151 char buf[MAX_ADDR_LEN]; 1152 struct net_device *dev = in_dev->dev; 1153 1154 if (arp_mc_map(addr, buf, dev, 0) == 0) 1155 dev_mc_del(dev, buf); 1156 } 1157 1158 #ifdef CONFIG_IP_MULTICAST 1159 /* 1160 * deleted ip_mc_list manipulation 1161 */ 1162 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, 1163 gfp_t gfp) 1164 { 1165 struct ip_mc_list *pmc; 1166 struct net *net = dev_net(in_dev->dev); 1167 1168 /* this is an "ip_mc_list" for convenience; only the fields below 1169 * are actually used. In particular, the refcnt and users are not 1170 * used for management of the delete list. Using the same structure 1171 * for deleted items allows change reports to use common code with 1172 * non-deleted or query-response MCA's. 1173 */ 1174 pmc = kzalloc(sizeof(*pmc), gfp); 1175 if (!pmc) 1176 return; 1177 spin_lock_init(&pmc->lock); 1178 spin_lock_bh(&im->lock); 1179 pmc->interface = im->interface; 1180 in_dev_hold(in_dev); 1181 pmc->multiaddr = im->multiaddr; 1182 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1183 pmc->sfmode = im->sfmode; 1184 if (pmc->sfmode == MCAST_INCLUDE) { 1185 struct ip_sf_list *psf; 1186 1187 pmc->tomb = im->tomb; 1188 pmc->sources = im->sources; 1189 im->tomb = im->sources = NULL; 1190 for (psf = pmc->sources; psf; psf = psf->sf_next) 1191 psf->sf_crcount = pmc->crcount; 1192 } 1193 spin_unlock_bh(&im->lock); 1194 1195 spin_lock_bh(&in_dev->mc_tomb_lock); 1196 pmc->next = in_dev->mc_tomb; 1197 in_dev->mc_tomb = pmc; 1198 spin_unlock_bh(&in_dev->mc_tomb_lock); 1199 } 1200 1201 /* 1202 * restore ip_mc_list deleted records 1203 */ 1204 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1205 { 1206 struct ip_mc_list *pmc, *pmc_prev; 1207 struct ip_sf_list *psf; 1208 struct net *net = dev_net(in_dev->dev); 1209 __be32 multiaddr = im->multiaddr; 1210 1211 spin_lock_bh(&in_dev->mc_tomb_lock); 1212 pmc_prev = NULL; 1213 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1214 if (pmc->multiaddr == multiaddr) 1215 break; 1216 pmc_prev = pmc; 1217 } 1218 if (pmc) { 1219 if (pmc_prev) 1220 pmc_prev->next = pmc->next; 1221 else 1222 in_dev->mc_tomb = pmc->next; 1223 } 1224 spin_unlock_bh(&in_dev->mc_tomb_lock); 1225 1226 spin_lock_bh(&im->lock); 1227 if (pmc) { 1228 im->interface = pmc->interface; 1229 if (im->sfmode == MCAST_INCLUDE) { 1230 swap(im->tomb, pmc->tomb); 1231 swap(im->sources, pmc->sources); 1232 for (psf = im->sources; psf; psf = psf->sf_next) 1233 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1234 } else { 1235 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1236 } 1237 in_dev_put(pmc->interface); 1238 kfree_pmc(pmc); 1239 } 1240 spin_unlock_bh(&im->lock); 1241 } 1242 1243 /* 1244 * flush ip_mc_list deleted records 1245 */ 1246 static void igmpv3_clear_delrec(struct in_device *in_dev) 1247 { 1248 struct ip_mc_list *pmc, *nextpmc; 1249 1250 spin_lock_bh(&in_dev->mc_tomb_lock); 1251 pmc = in_dev->mc_tomb; 1252 in_dev->mc_tomb = NULL; 1253 spin_unlock_bh(&in_dev->mc_tomb_lock); 1254 1255 for (; pmc; pmc = nextpmc) { 1256 nextpmc = pmc->next; 1257 ip_mc_clear_src(pmc); 1258 in_dev_put(pmc->interface); 1259 kfree_pmc(pmc); 1260 } 1261 /* clear dead sources, too */ 1262 rcu_read_lock(); 1263 for_each_pmc_rcu(in_dev, pmc) { 1264 struct ip_sf_list *psf; 1265 1266 spin_lock_bh(&pmc->lock); 1267 psf = pmc->tomb; 1268 pmc->tomb = NULL; 1269 spin_unlock_bh(&pmc->lock); 1270 ip_sf_list_clear_all(psf); 1271 } 1272 rcu_read_unlock(); 1273 } 1274 #endif 1275 1276 static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp) 1277 { 1278 struct in_device *in_dev = im->interface; 1279 #ifdef CONFIG_IP_MULTICAST 1280 struct net *net = dev_net(in_dev->dev); 1281 int reporter; 1282 #endif 1283 1284 if (im->loaded) { 1285 im->loaded = 0; 1286 ip_mc_filter_del(in_dev, im->multiaddr); 1287 } 1288 1289 #ifdef CONFIG_IP_MULTICAST 1290 if (im->multiaddr == IGMP_ALL_HOSTS) 1291 return; 1292 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1293 return; 1294 1295 reporter = im->reporter; 1296 igmp_stop_timer(im); 1297 1298 if (!in_dev->dead) { 1299 if (IGMP_V1_SEEN(in_dev)) 1300 return; 1301 if (IGMP_V2_SEEN(in_dev)) { 1302 if (reporter) 1303 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1304 return; 1305 } 1306 /* IGMPv3 */ 1307 igmpv3_add_delrec(in_dev, im, gfp); 1308 1309 igmp_ifc_event(in_dev); 1310 } 1311 #endif 1312 } 1313 1314 static void igmp_group_dropped(struct ip_mc_list *im) 1315 { 1316 __igmp_group_dropped(im, GFP_KERNEL); 1317 } 1318 1319 static void igmp_group_added(struct ip_mc_list *im) 1320 { 1321 struct in_device *in_dev = im->interface; 1322 #ifdef CONFIG_IP_MULTICAST 1323 struct net *net = dev_net(in_dev->dev); 1324 #endif 1325 1326 if (im->loaded == 0) { 1327 im->loaded = 1; 1328 ip_mc_filter_add(in_dev, im->multiaddr); 1329 } 1330 1331 #ifdef CONFIG_IP_MULTICAST 1332 if (im->multiaddr == IGMP_ALL_HOSTS) 1333 return; 1334 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) 1335 return; 1336 1337 if (in_dev->dead) 1338 return; 1339 1340 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; 1341 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1342 spin_lock_bh(&im->lock); 1343 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1344 spin_unlock_bh(&im->lock); 1345 return; 1346 } 1347 /* else, v3 */ 1348 1349 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should 1350 * not send filter-mode change record as the mode should be from 1351 * IN() to IN(A). 1352 */ 1353 if (im->sfmode == MCAST_EXCLUDE) 1354 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1355 1356 igmp_ifc_event(in_dev); 1357 #endif 1358 } 1359 1360 1361 /* 1362 * Multicast list managers 1363 */ 1364 1365 static u32 ip_mc_hash(const struct ip_mc_list *im) 1366 { 1367 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1368 } 1369 1370 static void ip_mc_hash_add(struct in_device *in_dev, 1371 struct ip_mc_list *im) 1372 { 1373 struct ip_mc_list __rcu **mc_hash; 1374 u32 hash; 1375 1376 mc_hash = rtnl_dereference(in_dev->mc_hash); 1377 if (mc_hash) { 1378 hash = ip_mc_hash(im); 1379 im->next_hash = mc_hash[hash]; 1380 rcu_assign_pointer(mc_hash[hash], im); 1381 return; 1382 } 1383 1384 /* do not use a hash table for small number of items */ 1385 if (in_dev->mc_count < 4) 1386 return; 1387 1388 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1389 GFP_KERNEL); 1390 if (!mc_hash) 1391 return; 1392 1393 for_each_pmc_rtnl(in_dev, im) { 1394 hash = ip_mc_hash(im); 1395 im->next_hash = mc_hash[hash]; 1396 RCU_INIT_POINTER(mc_hash[hash], im); 1397 } 1398 1399 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1400 } 1401 1402 static void ip_mc_hash_remove(struct in_device *in_dev, 1403 struct ip_mc_list *im) 1404 { 1405 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1406 struct ip_mc_list *aux; 1407 1408 if (!mc_hash) 1409 return; 1410 mc_hash += ip_mc_hash(im); 1411 while ((aux = rtnl_dereference(*mc_hash)) != im) 1412 mc_hash = &aux->next_hash; 1413 *mc_hash = im->next_hash; 1414 } 1415 1416 1417 /* 1418 * A socket has joined a multicast group on device dev. 1419 */ 1420 static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr, 1421 unsigned int mode, gfp_t gfp) 1422 { 1423 struct ip_mc_list *im; 1424 1425 ASSERT_RTNL(); 1426 1427 for_each_pmc_rtnl(in_dev, im) { 1428 if (im->multiaddr == addr) { 1429 im->users++; 1430 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); 1431 goto out; 1432 } 1433 } 1434 1435 im = kzalloc(sizeof(*im), gfp); 1436 if (!im) 1437 goto out; 1438 1439 im->users = 1; 1440 im->interface = in_dev; 1441 in_dev_hold(in_dev); 1442 im->multiaddr = addr; 1443 /* initial mode is (EX, empty) */ 1444 im->sfmode = mode; 1445 im->sfcount[mode] = 1; 1446 refcount_set(&im->refcnt, 1); 1447 spin_lock_init(&im->lock); 1448 #ifdef CONFIG_IP_MULTICAST 1449 timer_setup(&im->timer, igmp_timer_expire, 0); 1450 #endif 1451 1452 im->next_rcu = in_dev->mc_list; 1453 in_dev->mc_count++; 1454 rcu_assign_pointer(in_dev->mc_list, im); 1455 1456 ip_mc_hash_add(in_dev, im); 1457 1458 #ifdef CONFIG_IP_MULTICAST 1459 igmpv3_del_delrec(in_dev, im); 1460 #endif 1461 igmp_group_added(im); 1462 if (!in_dev->dead) 1463 ip_rt_multicast_event(in_dev); 1464 out: 1465 return; 1466 } 1467 1468 void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) 1469 { 1470 ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp); 1471 } 1472 EXPORT_SYMBOL(__ip_mc_inc_group); 1473 1474 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1475 { 1476 __ip_mc_inc_group(in_dev, addr, GFP_KERNEL); 1477 } 1478 EXPORT_SYMBOL(ip_mc_inc_group); 1479 1480 static int ip_mc_check_iphdr(struct sk_buff *skb) 1481 { 1482 const struct iphdr *iph; 1483 unsigned int len; 1484 unsigned int offset = skb_network_offset(skb) + sizeof(*iph); 1485 1486 if (!pskb_may_pull(skb, offset)) 1487 return -EINVAL; 1488 1489 iph = ip_hdr(skb); 1490 1491 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) 1492 return -EINVAL; 1493 1494 offset += ip_hdrlen(skb) - sizeof(*iph); 1495 1496 if (!pskb_may_pull(skb, offset)) 1497 return -EINVAL; 1498 1499 iph = ip_hdr(skb); 1500 1501 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) 1502 return -EINVAL; 1503 1504 len = skb_network_offset(skb) + ntohs(iph->tot_len); 1505 if (skb->len < len || len < offset) 1506 return -EINVAL; 1507 1508 skb_set_transport_header(skb, offset); 1509 1510 return 0; 1511 } 1512 1513 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) 1514 { 1515 unsigned int len = skb_transport_offset(skb); 1516 1517 len += sizeof(struct igmpv3_report); 1518 1519 return ip_mc_may_pull(skb, len) ? 0 : -EINVAL; 1520 } 1521 1522 static int ip_mc_check_igmp_query(struct sk_buff *skb) 1523 { 1524 unsigned int transport_len = ip_transport_len(skb); 1525 unsigned int len; 1526 1527 /* IGMPv{1,2}? */ 1528 if (transport_len != sizeof(struct igmphdr)) { 1529 /* or IGMPv3? */ 1530 if (transport_len < sizeof(struct igmpv3_query)) 1531 return -EINVAL; 1532 1533 len = skb_transport_offset(skb) + sizeof(struct igmpv3_query); 1534 if (!ip_mc_may_pull(skb, len)) 1535 return -EINVAL; 1536 } 1537 1538 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer 1539 * all-systems destination addresses (224.0.0.1) for general queries 1540 */ 1541 if (!igmp_hdr(skb)->group && 1542 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) 1543 return -EINVAL; 1544 1545 return 0; 1546 } 1547 1548 static int ip_mc_check_igmp_msg(struct sk_buff *skb) 1549 { 1550 switch (igmp_hdr(skb)->type) { 1551 case IGMP_HOST_LEAVE_MESSAGE: 1552 case IGMP_HOST_MEMBERSHIP_REPORT: 1553 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1554 return 0; 1555 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1556 return ip_mc_check_igmp_reportv3(skb); 1557 case IGMP_HOST_MEMBERSHIP_QUERY: 1558 return ip_mc_check_igmp_query(skb); 1559 default: 1560 return -ENOMSG; 1561 } 1562 } 1563 1564 static __sum16 ip_mc_validate_checksum(struct sk_buff *skb) 1565 { 1566 return skb_checksum_simple_validate(skb); 1567 } 1568 1569 static int ip_mc_check_igmp_csum(struct sk_buff *skb) 1570 { 1571 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); 1572 unsigned int transport_len = ip_transport_len(skb); 1573 struct sk_buff *skb_chk; 1574 1575 if (!ip_mc_may_pull(skb, len)) 1576 return -EINVAL; 1577 1578 skb_chk = skb_checksum_trimmed(skb, transport_len, 1579 ip_mc_validate_checksum); 1580 if (!skb_chk) 1581 return -EINVAL; 1582 1583 if (skb_chk != skb) 1584 kfree_skb(skb_chk); 1585 1586 return 0; 1587 } 1588 1589 /** 1590 * ip_mc_check_igmp - checks whether this is a sane IGMP packet 1591 * @skb: the skb to validate 1592 * 1593 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets 1594 * skb transport header accordingly and returns zero. 1595 * 1596 * -EINVAL: A broken packet was detected, i.e. it violates some internet 1597 * standard 1598 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. 1599 * -ENOMEM: A memory allocation failure happened. 1600 * 1601 * Caller needs to set the skb network header and free any returned skb if it 1602 * differs from the provided skb. 1603 */ 1604 int ip_mc_check_igmp(struct sk_buff *skb) 1605 { 1606 int ret = ip_mc_check_iphdr(skb); 1607 1608 if (ret < 0) 1609 return ret; 1610 1611 if (ip_hdr(skb)->protocol != IPPROTO_IGMP) 1612 return -ENOMSG; 1613 1614 ret = ip_mc_check_igmp_csum(skb); 1615 if (ret < 0) 1616 return ret; 1617 1618 return ip_mc_check_igmp_msg(skb); 1619 } 1620 EXPORT_SYMBOL(ip_mc_check_igmp); 1621 1622 /* 1623 * Resend IGMP JOIN report; used by netdev notifier. 1624 */ 1625 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1626 { 1627 #ifdef CONFIG_IP_MULTICAST 1628 struct ip_mc_list *im; 1629 int type; 1630 struct net *net = dev_net(in_dev->dev); 1631 1632 ASSERT_RTNL(); 1633 1634 for_each_pmc_rtnl(in_dev, im) { 1635 if (im->multiaddr == IGMP_ALL_HOSTS) 1636 continue; 1637 if (ipv4_is_local_multicast(im->multiaddr) && 1638 !net->ipv4.sysctl_igmp_llm_reports) 1639 continue; 1640 1641 /* a failover is happening and switches 1642 * must be notified immediately 1643 */ 1644 if (IGMP_V1_SEEN(in_dev)) 1645 type = IGMP_HOST_MEMBERSHIP_REPORT; 1646 else if (IGMP_V2_SEEN(in_dev)) 1647 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1648 else 1649 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1650 igmp_send_report(in_dev, im, type); 1651 } 1652 #endif 1653 } 1654 1655 /* 1656 * A socket has left a multicast group on device dev 1657 */ 1658 1659 void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) 1660 { 1661 struct ip_mc_list *i; 1662 struct ip_mc_list __rcu **ip; 1663 1664 ASSERT_RTNL(); 1665 1666 for (ip = &in_dev->mc_list; 1667 (i = rtnl_dereference(*ip)) != NULL; 1668 ip = &i->next_rcu) { 1669 if (i->multiaddr == addr) { 1670 if (--i->users == 0) { 1671 ip_mc_hash_remove(in_dev, i); 1672 *ip = i->next_rcu; 1673 in_dev->mc_count--; 1674 __igmp_group_dropped(i, gfp); 1675 ip_mc_clear_src(i); 1676 1677 if (!in_dev->dead) 1678 ip_rt_multicast_event(in_dev); 1679 1680 ip_ma_put(i); 1681 return; 1682 } 1683 break; 1684 } 1685 } 1686 } 1687 EXPORT_SYMBOL(__ip_mc_dec_group); 1688 1689 /* Device changing type */ 1690 1691 void ip_mc_unmap(struct in_device *in_dev) 1692 { 1693 struct ip_mc_list *pmc; 1694 1695 ASSERT_RTNL(); 1696 1697 for_each_pmc_rtnl(in_dev, pmc) 1698 igmp_group_dropped(pmc); 1699 } 1700 1701 void ip_mc_remap(struct in_device *in_dev) 1702 { 1703 struct ip_mc_list *pmc; 1704 1705 ASSERT_RTNL(); 1706 1707 for_each_pmc_rtnl(in_dev, pmc) { 1708 #ifdef CONFIG_IP_MULTICAST 1709 igmpv3_del_delrec(in_dev, pmc); 1710 #endif 1711 igmp_group_added(pmc); 1712 } 1713 } 1714 1715 /* Device going down */ 1716 1717 void ip_mc_down(struct in_device *in_dev) 1718 { 1719 struct ip_mc_list *pmc; 1720 1721 ASSERT_RTNL(); 1722 1723 for_each_pmc_rtnl(in_dev, pmc) 1724 igmp_group_dropped(pmc); 1725 1726 #ifdef CONFIG_IP_MULTICAST 1727 in_dev->mr_ifc_count = 0; 1728 if (del_timer(&in_dev->mr_ifc_timer)) 1729 __in_dev_put(in_dev); 1730 in_dev->mr_gq_running = 0; 1731 if (del_timer(&in_dev->mr_gq_timer)) 1732 __in_dev_put(in_dev); 1733 #endif 1734 1735 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1736 } 1737 1738 #ifdef CONFIG_IP_MULTICAST 1739 static void ip_mc_reset(struct in_device *in_dev) 1740 { 1741 struct net *net = dev_net(in_dev->dev); 1742 1743 in_dev->mr_qi = IGMP_QUERY_INTERVAL; 1744 in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL; 1745 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; 1746 } 1747 #else 1748 static void ip_mc_reset(struct in_device *in_dev) 1749 { 1750 } 1751 #endif 1752 1753 void ip_mc_init_dev(struct in_device *in_dev) 1754 { 1755 ASSERT_RTNL(); 1756 1757 #ifdef CONFIG_IP_MULTICAST 1758 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); 1759 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); 1760 #endif 1761 ip_mc_reset(in_dev); 1762 1763 spin_lock_init(&in_dev->mc_tomb_lock); 1764 } 1765 1766 /* Device going up */ 1767 1768 void ip_mc_up(struct in_device *in_dev) 1769 { 1770 struct ip_mc_list *pmc; 1771 1772 ASSERT_RTNL(); 1773 1774 ip_mc_reset(in_dev); 1775 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1776 1777 for_each_pmc_rtnl(in_dev, pmc) { 1778 #ifdef CONFIG_IP_MULTICAST 1779 igmpv3_del_delrec(in_dev, pmc); 1780 #endif 1781 igmp_group_added(pmc); 1782 } 1783 } 1784 1785 /* 1786 * Device is about to be destroyed: clean up. 1787 */ 1788 1789 void ip_mc_destroy_dev(struct in_device *in_dev) 1790 { 1791 struct ip_mc_list *i; 1792 1793 ASSERT_RTNL(); 1794 1795 /* Deactivate timers */ 1796 ip_mc_down(in_dev); 1797 #ifdef CONFIG_IP_MULTICAST 1798 igmpv3_clear_delrec(in_dev); 1799 #endif 1800 1801 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1802 in_dev->mc_list = i->next_rcu; 1803 in_dev->mc_count--; 1804 ip_ma_put(i); 1805 } 1806 } 1807 1808 /* RTNL is locked */ 1809 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1810 { 1811 struct net_device *dev = NULL; 1812 struct in_device *idev = NULL; 1813 1814 if (imr->imr_ifindex) { 1815 idev = inetdev_by_index(net, imr->imr_ifindex); 1816 return idev; 1817 } 1818 if (imr->imr_address.s_addr) { 1819 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1820 if (!dev) 1821 return NULL; 1822 } 1823 1824 if (!dev) { 1825 struct rtable *rt = ip_route_output(net, 1826 imr->imr_multiaddr.s_addr, 1827 0, 0, 0); 1828 if (!IS_ERR(rt)) { 1829 dev = rt->dst.dev; 1830 ip_rt_put(rt); 1831 } 1832 } 1833 if (dev) { 1834 imr->imr_ifindex = dev->ifindex; 1835 idev = __in_dev_get_rtnl(dev); 1836 } 1837 return idev; 1838 } 1839 1840 /* 1841 * Join a socket to a group 1842 */ 1843 1844 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1845 __be32 *psfsrc) 1846 { 1847 struct ip_sf_list *psf, *psf_prev; 1848 int rv = 0; 1849 1850 psf_prev = NULL; 1851 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1852 if (psf->sf_inaddr == *psfsrc) 1853 break; 1854 psf_prev = psf; 1855 } 1856 if (!psf || psf->sf_count[sfmode] == 0) { 1857 /* source filter not found, or count wrong => bug */ 1858 return -ESRCH; 1859 } 1860 psf->sf_count[sfmode]--; 1861 if (psf->sf_count[sfmode] == 0) { 1862 ip_rt_multicast_event(pmc->interface); 1863 } 1864 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1865 #ifdef CONFIG_IP_MULTICAST 1866 struct in_device *in_dev = pmc->interface; 1867 struct net *net = dev_net(in_dev->dev); 1868 #endif 1869 1870 /* no more filters for this source */ 1871 if (psf_prev) 1872 psf_prev->sf_next = psf->sf_next; 1873 else 1874 pmc->sources = psf->sf_next; 1875 #ifdef CONFIG_IP_MULTICAST 1876 if (psf->sf_oldin && 1877 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1878 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1879 psf->sf_next = pmc->tomb; 1880 pmc->tomb = psf; 1881 rv = 1; 1882 } else 1883 #endif 1884 kfree(psf); 1885 } 1886 return rv; 1887 } 1888 1889 #ifndef CONFIG_IP_MULTICAST 1890 #define igmp_ifc_event(x) do { } while (0) 1891 #endif 1892 1893 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1894 int sfcount, __be32 *psfsrc, int delta) 1895 { 1896 struct ip_mc_list *pmc; 1897 int changerec = 0; 1898 int i, err; 1899 1900 if (!in_dev) 1901 return -ENODEV; 1902 rcu_read_lock(); 1903 for_each_pmc_rcu(in_dev, pmc) { 1904 if (*pmca == pmc->multiaddr) 1905 break; 1906 } 1907 if (!pmc) { 1908 /* MCA not found?? bug */ 1909 rcu_read_unlock(); 1910 return -ESRCH; 1911 } 1912 spin_lock_bh(&pmc->lock); 1913 rcu_read_unlock(); 1914 #ifdef CONFIG_IP_MULTICAST 1915 sf_markstate(pmc); 1916 #endif 1917 if (!delta) { 1918 err = -EINVAL; 1919 if (!pmc->sfcount[sfmode]) 1920 goto out_unlock; 1921 pmc->sfcount[sfmode]--; 1922 } 1923 err = 0; 1924 for (i = 0; i < sfcount; i++) { 1925 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1926 1927 changerec |= rv > 0; 1928 if (!err && rv < 0) 1929 err = rv; 1930 } 1931 if (pmc->sfmode == MCAST_EXCLUDE && 1932 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1933 pmc->sfcount[MCAST_INCLUDE]) { 1934 #ifdef CONFIG_IP_MULTICAST 1935 struct ip_sf_list *psf; 1936 struct net *net = dev_net(in_dev->dev); 1937 #endif 1938 1939 /* filter mode change */ 1940 pmc->sfmode = MCAST_INCLUDE; 1941 #ifdef CONFIG_IP_MULTICAST 1942 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 1943 in_dev->mr_ifc_count = pmc->crcount; 1944 for (psf = pmc->sources; psf; psf = psf->sf_next) 1945 psf->sf_crcount = 0; 1946 igmp_ifc_event(pmc->interface); 1947 } else if (sf_setstate(pmc) || changerec) { 1948 igmp_ifc_event(pmc->interface); 1949 #endif 1950 } 1951 out_unlock: 1952 spin_unlock_bh(&pmc->lock); 1953 return err; 1954 } 1955 1956 /* 1957 * Add multicast single-source filter to the interface list 1958 */ 1959 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1960 __be32 *psfsrc) 1961 { 1962 struct ip_sf_list *psf, *psf_prev; 1963 1964 psf_prev = NULL; 1965 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1966 if (psf->sf_inaddr == *psfsrc) 1967 break; 1968 psf_prev = psf; 1969 } 1970 if (!psf) { 1971 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1972 if (!psf) 1973 return -ENOBUFS; 1974 psf->sf_inaddr = *psfsrc; 1975 if (psf_prev) { 1976 psf_prev->sf_next = psf; 1977 } else 1978 pmc->sources = psf; 1979 } 1980 psf->sf_count[sfmode]++; 1981 if (psf->sf_count[sfmode] == 1) { 1982 ip_rt_multicast_event(pmc->interface); 1983 } 1984 return 0; 1985 } 1986 1987 #ifdef CONFIG_IP_MULTICAST 1988 static void sf_markstate(struct ip_mc_list *pmc) 1989 { 1990 struct ip_sf_list *psf; 1991 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1992 1993 for (psf = pmc->sources; psf; psf = psf->sf_next) 1994 if (pmc->sfcount[MCAST_EXCLUDE]) { 1995 psf->sf_oldin = mca_xcount == 1996 psf->sf_count[MCAST_EXCLUDE] && 1997 !psf->sf_count[MCAST_INCLUDE]; 1998 } else 1999 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 2000 } 2001 2002 static int sf_setstate(struct ip_mc_list *pmc) 2003 { 2004 struct ip_sf_list *psf, *dpsf; 2005 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 2006 int qrv = pmc->interface->mr_qrv; 2007 int new_in, rv; 2008 2009 rv = 0; 2010 for (psf = pmc->sources; psf; psf = psf->sf_next) { 2011 if (pmc->sfcount[MCAST_EXCLUDE]) { 2012 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 2013 !psf->sf_count[MCAST_INCLUDE]; 2014 } else 2015 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 2016 if (new_in) { 2017 if (!psf->sf_oldin) { 2018 struct ip_sf_list *prev = NULL; 2019 2020 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 2021 if (dpsf->sf_inaddr == psf->sf_inaddr) 2022 break; 2023 prev = dpsf; 2024 } 2025 if (dpsf) { 2026 if (prev) 2027 prev->sf_next = dpsf->sf_next; 2028 else 2029 pmc->tomb = dpsf->sf_next; 2030 kfree(dpsf); 2031 } 2032 psf->sf_crcount = qrv; 2033 rv++; 2034 } 2035 } else if (psf->sf_oldin) { 2036 2037 psf->sf_crcount = 0; 2038 /* 2039 * add or update "delete" records if an active filter 2040 * is now inactive 2041 */ 2042 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 2043 if (dpsf->sf_inaddr == psf->sf_inaddr) 2044 break; 2045 if (!dpsf) { 2046 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 2047 if (!dpsf) 2048 continue; 2049 *dpsf = *psf; 2050 /* pmc->lock held by callers */ 2051 dpsf->sf_next = pmc->tomb; 2052 pmc->tomb = dpsf; 2053 } 2054 dpsf->sf_crcount = qrv; 2055 rv++; 2056 } 2057 } 2058 return rv; 2059 } 2060 #endif 2061 2062 /* 2063 * Add multicast source filter list to the interface list 2064 */ 2065 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 2066 int sfcount, __be32 *psfsrc, int delta) 2067 { 2068 struct ip_mc_list *pmc; 2069 int isexclude; 2070 int i, err; 2071 2072 if (!in_dev) 2073 return -ENODEV; 2074 rcu_read_lock(); 2075 for_each_pmc_rcu(in_dev, pmc) { 2076 if (*pmca == pmc->multiaddr) 2077 break; 2078 } 2079 if (!pmc) { 2080 /* MCA not found?? bug */ 2081 rcu_read_unlock(); 2082 return -ESRCH; 2083 } 2084 spin_lock_bh(&pmc->lock); 2085 rcu_read_unlock(); 2086 2087 #ifdef CONFIG_IP_MULTICAST 2088 sf_markstate(pmc); 2089 #endif 2090 isexclude = pmc->sfmode == MCAST_EXCLUDE; 2091 if (!delta) 2092 pmc->sfcount[sfmode]++; 2093 err = 0; 2094 for (i = 0; i < sfcount; i++) { 2095 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 2096 if (err) 2097 break; 2098 } 2099 if (err) { 2100 int j; 2101 2102 if (!delta) 2103 pmc->sfcount[sfmode]--; 2104 for (j = 0; j < i; j++) 2105 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 2106 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 2107 #ifdef CONFIG_IP_MULTICAST 2108 struct ip_sf_list *psf; 2109 struct net *net = dev_net(pmc->interface->dev); 2110 in_dev = pmc->interface; 2111 #endif 2112 2113 /* filter mode change */ 2114 if (pmc->sfcount[MCAST_EXCLUDE]) 2115 pmc->sfmode = MCAST_EXCLUDE; 2116 else if (pmc->sfcount[MCAST_INCLUDE]) 2117 pmc->sfmode = MCAST_INCLUDE; 2118 #ifdef CONFIG_IP_MULTICAST 2119 /* else no filters; keep old mode for reports */ 2120 2121 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; 2122 in_dev->mr_ifc_count = pmc->crcount; 2123 for (psf = pmc->sources; psf; psf = psf->sf_next) 2124 psf->sf_crcount = 0; 2125 igmp_ifc_event(in_dev); 2126 } else if (sf_setstate(pmc)) { 2127 igmp_ifc_event(in_dev); 2128 #endif 2129 } 2130 spin_unlock_bh(&pmc->lock); 2131 return err; 2132 } 2133 2134 static void ip_mc_clear_src(struct ip_mc_list *pmc) 2135 { 2136 struct ip_sf_list *tomb, *sources; 2137 2138 spin_lock_bh(&pmc->lock); 2139 tomb = pmc->tomb; 2140 pmc->tomb = NULL; 2141 sources = pmc->sources; 2142 pmc->sources = NULL; 2143 pmc->sfmode = MCAST_EXCLUDE; 2144 pmc->sfcount[MCAST_INCLUDE] = 0; 2145 pmc->sfcount[MCAST_EXCLUDE] = 1; 2146 spin_unlock_bh(&pmc->lock); 2147 2148 ip_sf_list_clear_all(tomb); 2149 ip_sf_list_clear_all(sources); 2150 } 2151 2152 /* Join a multicast group 2153 */ 2154 static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, 2155 unsigned int mode) 2156 { 2157 __be32 addr = imr->imr_multiaddr.s_addr; 2158 struct ip_mc_socklist *iml, *i; 2159 struct in_device *in_dev; 2160 struct inet_sock *inet = inet_sk(sk); 2161 struct net *net = sock_net(sk); 2162 int ifindex; 2163 int count = 0; 2164 int err; 2165 2166 ASSERT_RTNL(); 2167 2168 if (!ipv4_is_multicast(addr)) 2169 return -EINVAL; 2170 2171 in_dev = ip_mc_find_dev(net, imr); 2172 2173 if (!in_dev) { 2174 err = -ENODEV; 2175 goto done; 2176 } 2177 2178 err = -EADDRINUSE; 2179 ifindex = imr->imr_ifindex; 2180 for_each_pmc_rtnl(inet, i) { 2181 if (i->multi.imr_multiaddr.s_addr == addr && 2182 i->multi.imr_ifindex == ifindex) 2183 goto done; 2184 count++; 2185 } 2186 err = -ENOBUFS; 2187 if (count >= net->ipv4.sysctl_igmp_max_memberships) 2188 goto done; 2189 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 2190 if (!iml) 2191 goto done; 2192 2193 memcpy(&iml->multi, imr, sizeof(*imr)); 2194 iml->next_rcu = inet->mc_list; 2195 iml->sflist = NULL; 2196 iml->sfmode = mode; 2197 rcu_assign_pointer(inet->mc_list, iml); 2198 ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL); 2199 err = 0; 2200 done: 2201 return err; 2202 } 2203 2204 /* Join ASM (Any-Source Multicast) group 2205 */ 2206 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) 2207 { 2208 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); 2209 } 2210 EXPORT_SYMBOL(ip_mc_join_group); 2211 2212 /* Join SSM (Source-Specific Multicast) group 2213 */ 2214 int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, 2215 unsigned int mode) 2216 { 2217 return __ip_mc_join_group(sk, imr, mode); 2218 } 2219 2220 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 2221 struct in_device *in_dev) 2222 { 2223 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 2224 int err; 2225 2226 if (!psf) { 2227 /* any-source empty exclude case */ 2228 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2229 iml->sfmode, 0, NULL, 0); 2230 } 2231 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 2232 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 2233 RCU_INIT_POINTER(iml->sflist, NULL); 2234 /* decrease mem now to avoid the memleak warning */ 2235 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 2236 kfree_rcu(psf, rcu); 2237 return err; 2238 } 2239 2240 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 2241 { 2242 struct inet_sock *inet = inet_sk(sk); 2243 struct ip_mc_socklist *iml; 2244 struct ip_mc_socklist __rcu **imlp; 2245 struct in_device *in_dev; 2246 struct net *net = sock_net(sk); 2247 __be32 group = imr->imr_multiaddr.s_addr; 2248 u32 ifindex; 2249 int ret = -EADDRNOTAVAIL; 2250 2251 ASSERT_RTNL(); 2252 2253 in_dev = ip_mc_find_dev(net, imr); 2254 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { 2255 ret = -ENODEV; 2256 goto out; 2257 } 2258 ifindex = imr->imr_ifindex; 2259 for (imlp = &inet->mc_list; 2260 (iml = rtnl_dereference(*imlp)) != NULL; 2261 imlp = &iml->next_rcu) { 2262 if (iml->multi.imr_multiaddr.s_addr != group) 2263 continue; 2264 if (ifindex) { 2265 if (iml->multi.imr_ifindex != ifindex) 2266 continue; 2267 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 2268 iml->multi.imr_address.s_addr) 2269 continue; 2270 2271 (void) ip_mc_leave_src(sk, iml, in_dev); 2272 2273 *imlp = iml->next_rcu; 2274 2275 if (in_dev) 2276 ip_mc_dec_group(in_dev, group); 2277 2278 /* decrease mem now to avoid the memleak warning */ 2279 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2280 kfree_rcu(iml, rcu); 2281 return 0; 2282 } 2283 out: 2284 return ret; 2285 } 2286 EXPORT_SYMBOL(ip_mc_leave_group); 2287 2288 int ip_mc_source(int add, int omode, struct sock *sk, struct 2289 ip_mreq_source *mreqs, int ifindex) 2290 { 2291 int err; 2292 struct ip_mreqn imr; 2293 __be32 addr = mreqs->imr_multiaddr; 2294 struct ip_mc_socklist *pmc; 2295 struct in_device *in_dev = NULL; 2296 struct inet_sock *inet = inet_sk(sk); 2297 struct ip_sf_socklist *psl; 2298 struct net *net = sock_net(sk); 2299 int leavegroup = 0; 2300 int i, j, rv; 2301 2302 if (!ipv4_is_multicast(addr)) 2303 return -EINVAL; 2304 2305 ASSERT_RTNL(); 2306 2307 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2308 imr.imr_address.s_addr = mreqs->imr_interface; 2309 imr.imr_ifindex = ifindex; 2310 in_dev = ip_mc_find_dev(net, &imr); 2311 2312 if (!in_dev) { 2313 err = -ENODEV; 2314 goto done; 2315 } 2316 err = -EADDRNOTAVAIL; 2317 2318 for_each_pmc_rtnl(inet, pmc) { 2319 if ((pmc->multi.imr_multiaddr.s_addr == 2320 imr.imr_multiaddr.s_addr) && 2321 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2322 break; 2323 } 2324 if (!pmc) { /* must have a prior join */ 2325 err = -EINVAL; 2326 goto done; 2327 } 2328 /* if a source filter was set, must be the same mode as before */ 2329 if (pmc->sflist) { 2330 if (pmc->sfmode != omode) { 2331 err = -EINVAL; 2332 goto done; 2333 } 2334 } else if (pmc->sfmode != omode) { 2335 /* allow mode switches for empty-set filters */ 2336 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2337 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2338 NULL, 0); 2339 pmc->sfmode = omode; 2340 } 2341 2342 psl = rtnl_dereference(pmc->sflist); 2343 if (!add) { 2344 if (!psl) 2345 goto done; /* err = -EADDRNOTAVAIL */ 2346 rv = !0; 2347 for (i = 0; i < psl->sl_count; i++) { 2348 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2349 sizeof(__be32)); 2350 if (rv == 0) 2351 break; 2352 } 2353 if (rv) /* source not found */ 2354 goto done; /* err = -EADDRNOTAVAIL */ 2355 2356 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2357 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2358 leavegroup = 1; 2359 goto done; 2360 } 2361 2362 /* update the interface filter */ 2363 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2364 &mreqs->imr_sourceaddr, 1); 2365 2366 for (j = i+1; j < psl->sl_count; j++) 2367 psl->sl_addr[j-1] = psl->sl_addr[j]; 2368 psl->sl_count--; 2369 err = 0; 2370 goto done; 2371 } 2372 /* else, add a new source to the filter */ 2373 2374 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { 2375 err = -ENOBUFS; 2376 goto done; 2377 } 2378 if (!psl || psl->sl_count == psl->sl_max) { 2379 struct ip_sf_socklist *newpsl; 2380 int count = IP_SFBLOCK; 2381 2382 if (psl) 2383 count += psl->sl_max; 2384 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2385 if (!newpsl) { 2386 err = -ENOBUFS; 2387 goto done; 2388 } 2389 newpsl->sl_max = count; 2390 newpsl->sl_count = count - IP_SFBLOCK; 2391 if (psl) { 2392 for (i = 0; i < psl->sl_count; i++) 2393 newpsl->sl_addr[i] = psl->sl_addr[i]; 2394 /* decrease mem now to avoid the memleak warning */ 2395 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2396 kfree_rcu(psl, rcu); 2397 } 2398 rcu_assign_pointer(pmc->sflist, newpsl); 2399 psl = newpsl; 2400 } 2401 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2402 for (i = 0; i < psl->sl_count; i++) { 2403 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2404 sizeof(__be32)); 2405 if (rv == 0) 2406 break; 2407 } 2408 if (rv == 0) /* address already there is an error */ 2409 goto done; 2410 for (j = psl->sl_count-1; j >= i; j--) 2411 psl->sl_addr[j+1] = psl->sl_addr[j]; 2412 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2413 psl->sl_count++; 2414 err = 0; 2415 /* update the interface list */ 2416 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2417 &mreqs->imr_sourceaddr, 1); 2418 done: 2419 if (leavegroup) 2420 err = ip_mc_leave_group(sk, &imr); 2421 return err; 2422 } 2423 2424 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2425 { 2426 int err = 0; 2427 struct ip_mreqn imr; 2428 __be32 addr = msf->imsf_multiaddr; 2429 struct ip_mc_socklist *pmc; 2430 struct in_device *in_dev; 2431 struct inet_sock *inet = inet_sk(sk); 2432 struct ip_sf_socklist *newpsl, *psl; 2433 struct net *net = sock_net(sk); 2434 int leavegroup = 0; 2435 2436 if (!ipv4_is_multicast(addr)) 2437 return -EINVAL; 2438 if (msf->imsf_fmode != MCAST_INCLUDE && 2439 msf->imsf_fmode != MCAST_EXCLUDE) 2440 return -EINVAL; 2441 2442 ASSERT_RTNL(); 2443 2444 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2445 imr.imr_address.s_addr = msf->imsf_interface; 2446 imr.imr_ifindex = ifindex; 2447 in_dev = ip_mc_find_dev(net, &imr); 2448 2449 if (!in_dev) { 2450 err = -ENODEV; 2451 goto done; 2452 } 2453 2454 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2455 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2456 leavegroup = 1; 2457 goto done; 2458 } 2459 2460 for_each_pmc_rtnl(inet, pmc) { 2461 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2462 pmc->multi.imr_ifindex == imr.imr_ifindex) 2463 break; 2464 } 2465 if (!pmc) { /* must have a prior join */ 2466 err = -EINVAL; 2467 goto done; 2468 } 2469 if (msf->imsf_numsrc) { 2470 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2471 GFP_KERNEL); 2472 if (!newpsl) { 2473 err = -ENOBUFS; 2474 goto done; 2475 } 2476 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2477 memcpy(newpsl->sl_addr, msf->imsf_slist, 2478 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2479 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2480 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2481 if (err) { 2482 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2483 goto done; 2484 } 2485 } else { 2486 newpsl = NULL; 2487 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2488 msf->imsf_fmode, 0, NULL, 0); 2489 } 2490 psl = rtnl_dereference(pmc->sflist); 2491 if (psl) { 2492 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2493 psl->sl_count, psl->sl_addr, 0); 2494 /* decrease mem now to avoid the memleak warning */ 2495 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2496 kfree_rcu(psl, rcu); 2497 } else 2498 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2499 0, NULL, 0); 2500 rcu_assign_pointer(pmc->sflist, newpsl); 2501 pmc->sfmode = msf->imsf_fmode; 2502 err = 0; 2503 done: 2504 if (leavegroup) 2505 err = ip_mc_leave_group(sk, &imr); 2506 return err; 2507 } 2508 2509 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2510 struct ip_msfilter __user *optval, int __user *optlen) 2511 { 2512 int err, len, count, copycount; 2513 struct ip_mreqn imr; 2514 __be32 addr = msf->imsf_multiaddr; 2515 struct ip_mc_socklist *pmc; 2516 struct in_device *in_dev; 2517 struct inet_sock *inet = inet_sk(sk); 2518 struct ip_sf_socklist *psl; 2519 struct net *net = sock_net(sk); 2520 2521 ASSERT_RTNL(); 2522 2523 if (!ipv4_is_multicast(addr)) 2524 return -EINVAL; 2525 2526 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2527 imr.imr_address.s_addr = msf->imsf_interface; 2528 imr.imr_ifindex = 0; 2529 in_dev = ip_mc_find_dev(net, &imr); 2530 2531 if (!in_dev) { 2532 err = -ENODEV; 2533 goto done; 2534 } 2535 err = -EADDRNOTAVAIL; 2536 2537 for_each_pmc_rtnl(inet, pmc) { 2538 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2539 pmc->multi.imr_ifindex == imr.imr_ifindex) 2540 break; 2541 } 2542 if (!pmc) /* must have a prior join */ 2543 goto done; 2544 msf->imsf_fmode = pmc->sfmode; 2545 psl = rtnl_dereference(pmc->sflist); 2546 if (!psl) { 2547 len = 0; 2548 count = 0; 2549 } else { 2550 count = psl->sl_count; 2551 } 2552 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2553 len = copycount * sizeof(psl->sl_addr[0]); 2554 msf->imsf_numsrc = count; 2555 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2556 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2557 return -EFAULT; 2558 } 2559 if (len && 2560 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2561 return -EFAULT; 2562 return 0; 2563 done: 2564 return err; 2565 } 2566 2567 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2568 struct group_filter __user *optval, int __user *optlen) 2569 { 2570 int err, i, count, copycount; 2571 struct sockaddr_in *psin; 2572 __be32 addr; 2573 struct ip_mc_socklist *pmc; 2574 struct inet_sock *inet = inet_sk(sk); 2575 struct ip_sf_socklist *psl; 2576 2577 ASSERT_RTNL(); 2578 2579 psin = (struct sockaddr_in *)&gsf->gf_group; 2580 if (psin->sin_family != AF_INET) 2581 return -EINVAL; 2582 addr = psin->sin_addr.s_addr; 2583 if (!ipv4_is_multicast(addr)) 2584 return -EINVAL; 2585 2586 err = -EADDRNOTAVAIL; 2587 2588 for_each_pmc_rtnl(inet, pmc) { 2589 if (pmc->multi.imr_multiaddr.s_addr == addr && 2590 pmc->multi.imr_ifindex == gsf->gf_interface) 2591 break; 2592 } 2593 if (!pmc) /* must have a prior join */ 2594 goto done; 2595 gsf->gf_fmode = pmc->sfmode; 2596 psl = rtnl_dereference(pmc->sflist); 2597 count = psl ? psl->sl_count : 0; 2598 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2599 gsf->gf_numsrc = count; 2600 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2601 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2602 return -EFAULT; 2603 } 2604 for (i = 0; i < copycount; i++) { 2605 struct sockaddr_storage ss; 2606 2607 psin = (struct sockaddr_in *)&ss; 2608 memset(&ss, 0, sizeof(ss)); 2609 psin->sin_family = AF_INET; 2610 psin->sin_addr.s_addr = psl->sl_addr[i]; 2611 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2612 return -EFAULT; 2613 } 2614 return 0; 2615 done: 2616 return err; 2617 } 2618 2619 /* 2620 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2621 */ 2622 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, 2623 int dif, int sdif) 2624 { 2625 struct inet_sock *inet = inet_sk(sk); 2626 struct ip_mc_socklist *pmc; 2627 struct ip_sf_socklist *psl; 2628 int i; 2629 int ret; 2630 2631 ret = 1; 2632 if (!ipv4_is_multicast(loc_addr)) 2633 goto out; 2634 2635 rcu_read_lock(); 2636 for_each_pmc_rcu(inet, pmc) { 2637 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2638 (pmc->multi.imr_ifindex == dif || 2639 (sdif && pmc->multi.imr_ifindex == sdif))) 2640 break; 2641 } 2642 ret = inet->mc_all; 2643 if (!pmc) 2644 goto unlock; 2645 psl = rcu_dereference(pmc->sflist); 2646 ret = (pmc->sfmode == MCAST_EXCLUDE); 2647 if (!psl) 2648 goto unlock; 2649 2650 for (i = 0; i < psl->sl_count; i++) { 2651 if (psl->sl_addr[i] == rmt_addr) 2652 break; 2653 } 2654 ret = 0; 2655 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2656 goto unlock; 2657 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2658 goto unlock; 2659 ret = 1; 2660 unlock: 2661 rcu_read_unlock(); 2662 out: 2663 return ret; 2664 } 2665 2666 /* 2667 * A socket is closing. 2668 */ 2669 2670 void ip_mc_drop_socket(struct sock *sk) 2671 { 2672 struct inet_sock *inet = inet_sk(sk); 2673 struct ip_mc_socklist *iml; 2674 struct net *net = sock_net(sk); 2675 2676 if (!inet->mc_list) 2677 return; 2678 2679 rtnl_lock(); 2680 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2681 struct in_device *in_dev; 2682 2683 inet->mc_list = iml->next_rcu; 2684 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2685 (void) ip_mc_leave_src(sk, iml, in_dev); 2686 if (in_dev) 2687 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2688 /* decrease mem now to avoid the memleak warning */ 2689 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2690 kfree_rcu(iml, rcu); 2691 } 2692 rtnl_unlock(); 2693 } 2694 2695 /* called with rcu_read_lock() */ 2696 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) 2697 { 2698 struct ip_mc_list *im; 2699 struct ip_mc_list __rcu **mc_hash; 2700 struct ip_sf_list *psf; 2701 int rv = 0; 2702 2703 mc_hash = rcu_dereference(in_dev->mc_hash); 2704 if (mc_hash) { 2705 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2706 2707 for (im = rcu_dereference(mc_hash[hash]); 2708 im != NULL; 2709 im = rcu_dereference(im->next_hash)) { 2710 if (im->multiaddr == mc_addr) 2711 break; 2712 } 2713 } else { 2714 for_each_pmc_rcu(in_dev, im) { 2715 if (im->multiaddr == mc_addr) 2716 break; 2717 } 2718 } 2719 if (im && proto == IPPROTO_IGMP) { 2720 rv = 1; 2721 } else if (im) { 2722 if (src_addr) { 2723 for (psf = im->sources; psf; psf = psf->sf_next) { 2724 if (psf->sf_inaddr == src_addr) 2725 break; 2726 } 2727 if (psf) 2728 rv = psf->sf_count[MCAST_INCLUDE] || 2729 psf->sf_count[MCAST_EXCLUDE] != 2730 im->sfcount[MCAST_EXCLUDE]; 2731 else 2732 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2733 } else 2734 rv = 1; /* unspecified source; tentatively allow */ 2735 } 2736 return rv; 2737 } 2738 2739 #if defined(CONFIG_PROC_FS) 2740 struct igmp_mc_iter_state { 2741 struct seq_net_private p; 2742 struct net_device *dev; 2743 struct in_device *in_dev; 2744 }; 2745 2746 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2747 2748 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2749 { 2750 struct net *net = seq_file_net(seq); 2751 struct ip_mc_list *im = NULL; 2752 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2753 2754 state->in_dev = NULL; 2755 for_each_netdev_rcu(net, state->dev) { 2756 struct in_device *in_dev; 2757 2758 in_dev = __in_dev_get_rcu(state->dev); 2759 if (!in_dev) 2760 continue; 2761 im = rcu_dereference(in_dev->mc_list); 2762 if (im) { 2763 state->in_dev = in_dev; 2764 break; 2765 } 2766 } 2767 return im; 2768 } 2769 2770 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2771 { 2772 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2773 2774 im = rcu_dereference(im->next_rcu); 2775 while (!im) { 2776 state->dev = next_net_device_rcu(state->dev); 2777 if (!state->dev) { 2778 state->in_dev = NULL; 2779 break; 2780 } 2781 state->in_dev = __in_dev_get_rcu(state->dev); 2782 if (!state->in_dev) 2783 continue; 2784 im = rcu_dereference(state->in_dev->mc_list); 2785 } 2786 return im; 2787 } 2788 2789 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2790 { 2791 struct ip_mc_list *im = igmp_mc_get_first(seq); 2792 if (im) 2793 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2794 --pos; 2795 return pos ? NULL : im; 2796 } 2797 2798 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2799 __acquires(rcu) 2800 { 2801 rcu_read_lock(); 2802 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2803 } 2804 2805 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2806 { 2807 struct ip_mc_list *im; 2808 if (v == SEQ_START_TOKEN) 2809 im = igmp_mc_get_first(seq); 2810 else 2811 im = igmp_mc_get_next(seq, v); 2812 ++*pos; 2813 return im; 2814 } 2815 2816 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2817 __releases(rcu) 2818 { 2819 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2820 2821 state->in_dev = NULL; 2822 state->dev = NULL; 2823 rcu_read_unlock(); 2824 } 2825 2826 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2827 { 2828 if (v == SEQ_START_TOKEN) 2829 seq_puts(seq, 2830 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2831 else { 2832 struct ip_mc_list *im = (struct ip_mc_list *)v; 2833 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2834 char *querier; 2835 long delta; 2836 2837 #ifdef CONFIG_IP_MULTICAST 2838 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2839 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2840 "V3"; 2841 #else 2842 querier = "NONE"; 2843 #endif 2844 2845 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2846 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2847 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2848 } 2849 2850 delta = im->timer.expires - jiffies; 2851 seq_printf(seq, 2852 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2853 im->multiaddr, im->users, 2854 im->tm_running, 2855 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2856 im->reporter); 2857 } 2858 return 0; 2859 } 2860 2861 static const struct seq_operations igmp_mc_seq_ops = { 2862 .start = igmp_mc_seq_start, 2863 .next = igmp_mc_seq_next, 2864 .stop = igmp_mc_seq_stop, 2865 .show = igmp_mc_seq_show, 2866 }; 2867 2868 struct igmp_mcf_iter_state { 2869 struct seq_net_private p; 2870 struct net_device *dev; 2871 struct in_device *idev; 2872 struct ip_mc_list *im; 2873 }; 2874 2875 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2876 2877 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2878 { 2879 struct net *net = seq_file_net(seq); 2880 struct ip_sf_list *psf = NULL; 2881 struct ip_mc_list *im = NULL; 2882 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2883 2884 state->idev = NULL; 2885 state->im = NULL; 2886 for_each_netdev_rcu(net, state->dev) { 2887 struct in_device *idev; 2888 idev = __in_dev_get_rcu(state->dev); 2889 if (unlikely(!idev)) 2890 continue; 2891 im = rcu_dereference(idev->mc_list); 2892 if (likely(im)) { 2893 spin_lock_bh(&im->lock); 2894 psf = im->sources; 2895 if (likely(psf)) { 2896 state->im = im; 2897 state->idev = idev; 2898 break; 2899 } 2900 spin_unlock_bh(&im->lock); 2901 } 2902 } 2903 return psf; 2904 } 2905 2906 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2907 { 2908 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2909 2910 psf = psf->sf_next; 2911 while (!psf) { 2912 spin_unlock_bh(&state->im->lock); 2913 state->im = state->im->next; 2914 while (!state->im) { 2915 state->dev = next_net_device_rcu(state->dev); 2916 if (!state->dev) { 2917 state->idev = NULL; 2918 goto out; 2919 } 2920 state->idev = __in_dev_get_rcu(state->dev); 2921 if (!state->idev) 2922 continue; 2923 state->im = rcu_dereference(state->idev->mc_list); 2924 } 2925 if (!state->im) 2926 break; 2927 spin_lock_bh(&state->im->lock); 2928 psf = state->im->sources; 2929 } 2930 out: 2931 return psf; 2932 } 2933 2934 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2935 { 2936 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2937 if (psf) 2938 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2939 --pos; 2940 return pos ? NULL : psf; 2941 } 2942 2943 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2944 __acquires(rcu) 2945 { 2946 rcu_read_lock(); 2947 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2948 } 2949 2950 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2951 { 2952 struct ip_sf_list *psf; 2953 if (v == SEQ_START_TOKEN) 2954 psf = igmp_mcf_get_first(seq); 2955 else 2956 psf = igmp_mcf_get_next(seq, v); 2957 ++*pos; 2958 return psf; 2959 } 2960 2961 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2962 __releases(rcu) 2963 { 2964 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2965 if (likely(state->im)) { 2966 spin_unlock_bh(&state->im->lock); 2967 state->im = NULL; 2968 } 2969 state->idev = NULL; 2970 state->dev = NULL; 2971 rcu_read_unlock(); 2972 } 2973 2974 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2975 { 2976 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2977 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2978 2979 if (v == SEQ_START_TOKEN) { 2980 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2981 } else { 2982 seq_printf(seq, 2983 "%3d %6.6s 0x%08x " 2984 "0x%08x %6lu %6lu\n", 2985 state->dev->ifindex, state->dev->name, 2986 ntohl(state->im->multiaddr), 2987 ntohl(psf->sf_inaddr), 2988 psf->sf_count[MCAST_INCLUDE], 2989 psf->sf_count[MCAST_EXCLUDE]); 2990 } 2991 return 0; 2992 } 2993 2994 static const struct seq_operations igmp_mcf_seq_ops = { 2995 .start = igmp_mcf_seq_start, 2996 .next = igmp_mcf_seq_next, 2997 .stop = igmp_mcf_seq_stop, 2998 .show = igmp_mcf_seq_show, 2999 }; 3000 3001 static int __net_init igmp_net_init(struct net *net) 3002 { 3003 struct proc_dir_entry *pde; 3004 int err; 3005 3006 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, 3007 sizeof(struct igmp_mc_iter_state)); 3008 if (!pde) 3009 goto out_igmp; 3010 pde = proc_create_net("mcfilter", 0444, net->proc_net, 3011 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); 3012 if (!pde) 3013 goto out_mcfilter; 3014 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, 3015 SOCK_DGRAM, 0, net); 3016 if (err < 0) { 3017 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", 3018 err); 3019 goto out_sock; 3020 } 3021 3022 return 0; 3023 3024 out_sock: 3025 remove_proc_entry("mcfilter", net->proc_net); 3026 out_mcfilter: 3027 remove_proc_entry("igmp", net->proc_net); 3028 out_igmp: 3029 return -ENOMEM; 3030 } 3031 3032 static void __net_exit igmp_net_exit(struct net *net) 3033 { 3034 remove_proc_entry("mcfilter", net->proc_net); 3035 remove_proc_entry("igmp", net->proc_net); 3036 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); 3037 } 3038 3039 static struct pernet_operations igmp_net_ops = { 3040 .init = igmp_net_init, 3041 .exit = igmp_net_exit, 3042 }; 3043 #endif 3044 3045 static int igmp_netdev_event(struct notifier_block *this, 3046 unsigned long event, void *ptr) 3047 { 3048 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3049 struct in_device *in_dev; 3050 3051 switch (event) { 3052 case NETDEV_RESEND_IGMP: 3053 in_dev = __in_dev_get_rtnl(dev); 3054 if (in_dev) 3055 ip_mc_rejoin_groups(in_dev); 3056 break; 3057 default: 3058 break; 3059 } 3060 return NOTIFY_DONE; 3061 } 3062 3063 static struct notifier_block igmp_notifier = { 3064 .notifier_call = igmp_netdev_event, 3065 }; 3066 3067 int __init igmp_mc_init(void) 3068 { 3069 #if defined(CONFIG_PROC_FS) 3070 int err; 3071 3072 err = register_pernet_subsys(&igmp_net_ops); 3073 if (err) 3074 return err; 3075 err = register_netdevice_notifier(&igmp_notifier); 3076 if (err) 3077 goto reg_notif_fail; 3078 return 0; 3079 3080 reg_notif_fail: 3081 unregister_pernet_subsys(&igmp_net_ops); 3082 return err; 3083 #else 3084 return register_netdevice_notifier(&igmp_notifier); 3085 #endif 3086 } 3087