igmp.c revision 7091e728c570157496e52296d2dbe816a6916836
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 <asm/uaccess.h> 75#include <asm/system.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 92#include <net/net_namespace.h> 93#include <net/arp.h> 94#include <net/ip.h> 95#include <net/protocol.h> 96#include <net/route.h> 97#include <net/sock.h> 98#include <net/checksum.h> 99#include <linux/netfilter_ipv4.h> 100#ifdef CONFIG_IP_MROUTE 101#include <linux/mroute.h> 102#endif 103#ifdef CONFIG_PROC_FS 104#include <linux/proc_fs.h> 105#include <linux/seq_file.h> 106#endif 107 108#define IP_MAX_MEMBERSHIPS 20 109#define IP_MAX_MSF 10 110 111#ifdef CONFIG_IP_MULTICAST 112/* Parameter names and values are taken from igmp-v2-06 draft */ 113 114#define IGMP_V1_Router_Present_Timeout (400*HZ) 115#define IGMP_V2_Router_Present_Timeout (400*HZ) 116#define IGMP_Unsolicited_Report_Interval (10*HZ) 117#define IGMP_Query_Response_Interval (10*HZ) 118#define IGMP_Unsolicited_Report_Count 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 141static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 142static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 143static void igmpv3_clear_delrec(struct in_device *in_dev); 144static int sf_setstate(struct ip_mc_list *pmc); 145static void sf_markstate(struct ip_mc_list *pmc); 146#endif 147static void ip_mc_clear_src(struct ip_mc_list *pmc); 148static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 149 int sfcount, __be32 *psfsrc, int delta); 150 151static void ip_ma_put(struct ip_mc_list *im) 152{ 153 if (atomic_dec_and_test(&im->refcnt)) { 154 in_dev_put(im->interface); 155 kfree(im); 156 } 157} 158 159#ifdef CONFIG_IP_MULTICAST 160 161/* 162 * Timer management 163 */ 164 165static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 166{ 167 spin_lock_bh(&im->lock); 168 if (del_timer(&im->timer)) 169 atomic_dec(&im->refcnt); 170 im->tm_running = 0; 171 im->reporter = 0; 172 im->unsolicit_count = 0; 173 spin_unlock_bh(&im->lock); 174} 175 176/* It must be called with locked im->lock */ 177static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 178{ 179 int tv = net_random() % max_delay; 180 181 im->tm_running = 1; 182 if (!mod_timer(&im->timer, jiffies+tv+2)) 183 atomic_inc(&im->refcnt); 184} 185 186static void igmp_gq_start_timer(struct in_device *in_dev) 187{ 188 int tv = net_random() % in_dev->mr_maxdelay; 189 190 in_dev->mr_gq_running = 1; 191 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 192 in_dev_hold(in_dev); 193} 194 195static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 196{ 197 int tv = net_random() % delay; 198 199 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 200 in_dev_hold(in_dev); 201} 202 203static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 204{ 205 spin_lock_bh(&im->lock); 206 im->unsolicit_count = 0; 207 if (del_timer(&im->timer)) { 208 if ((long)(im->timer.expires-jiffies) < max_delay) { 209 add_timer(&im->timer); 210 im->tm_running = 1; 211 spin_unlock_bh(&im->lock); 212 return; 213 } 214 atomic_dec(&im->refcnt); 215 } 216 igmp_start_timer(im, max_delay); 217 spin_unlock_bh(&im->lock); 218} 219 220 221/* 222 * Send an IGMP report. 223 */ 224 225#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 226 227 228static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 229 int gdeleted, int sdeleted) 230{ 231 switch (type) { 232 case IGMPV3_MODE_IS_INCLUDE: 233 case IGMPV3_MODE_IS_EXCLUDE: 234 if (gdeleted || sdeleted) 235 return 0; 236 if (!(pmc->gsquery && !psf->sf_gsresp)) { 237 if (pmc->sfmode == MCAST_INCLUDE) 238 return 1; 239 /* don't include if this source is excluded 240 * in all filters 241 */ 242 if (psf->sf_count[MCAST_INCLUDE]) 243 return type == IGMPV3_MODE_IS_INCLUDE; 244 return pmc->sfcount[MCAST_EXCLUDE] == 245 psf->sf_count[MCAST_EXCLUDE]; 246 } 247 return 0; 248 case IGMPV3_CHANGE_TO_INCLUDE: 249 if (gdeleted || sdeleted) 250 return 0; 251 return psf->sf_count[MCAST_INCLUDE] != 0; 252 case IGMPV3_CHANGE_TO_EXCLUDE: 253 if (gdeleted || sdeleted) 254 return 0; 255 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 256 psf->sf_count[MCAST_INCLUDE]) 257 return 0; 258 return pmc->sfcount[MCAST_EXCLUDE] == 259 psf->sf_count[MCAST_EXCLUDE]; 260 case IGMPV3_ALLOW_NEW_SOURCES: 261 if (gdeleted || !psf->sf_crcount) 262 return 0; 263 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 264 case IGMPV3_BLOCK_OLD_SOURCES: 265 if (pmc->sfmode == MCAST_INCLUDE) 266 return gdeleted || (psf->sf_crcount && sdeleted); 267 return psf->sf_crcount && !gdeleted && !sdeleted; 268 } 269 return 0; 270} 271 272static int 273igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 274{ 275 struct ip_sf_list *psf; 276 int scount = 0; 277 278 for (psf=pmc->sources; psf; psf=psf->sf_next) { 279 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 280 continue; 281 scount++; 282 } 283 return scount; 284} 285 286static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 287{ 288 struct sk_buff *skb; 289 struct rtable *rt; 290 struct iphdr *pip; 291 struct igmpv3_report *pig; 292 struct net *net = dev_net(dev); 293 294 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 295 if (skb == NULL) 296 return NULL; 297 298 { 299 struct flowi fl = { .oif = dev->ifindex, 300 .nl_u = { .ip4_u = { 301 .daddr = IGMPV3_ALL_MCR } }, 302 .proto = IPPROTO_IGMP }; 303 if (ip_route_output_key(net, &rt, &fl)) { 304 kfree_skb(skb); 305 return NULL; 306 } 307 } 308 if (rt->rt_src == 0) { 309 kfree_skb(skb); 310 ip_rt_put(rt); 311 return NULL; 312 } 313 314 skb->dst = &rt->u.dst; 315 skb->dev = dev; 316 317 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 318 319 skb_reset_network_header(skb); 320 pip = ip_hdr(skb); 321 skb_put(skb, sizeof(struct iphdr) + 4); 322 323 pip->version = 4; 324 pip->ihl = (sizeof(struct iphdr)+4)>>2; 325 pip->tos = 0xc0; 326 pip->frag_off = htons(IP_DF); 327 pip->ttl = 1; 328 pip->daddr = rt->rt_dst; 329 pip->saddr = rt->rt_src; 330 pip->protocol = IPPROTO_IGMP; 331 pip->tot_len = 0; /* filled in later */ 332 ip_select_ident(pip, &rt->u.dst, NULL); 333 ((u8*)&pip[1])[0] = IPOPT_RA; 334 ((u8*)&pip[1])[1] = 4; 335 ((u8*)&pip[1])[2] = 0; 336 ((u8*)&pip[1])[3] = 0; 337 338 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 339 skb_put(skb, sizeof(*pig)); 340 pig = igmpv3_report_hdr(skb); 341 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 342 pig->resv1 = 0; 343 pig->csum = 0; 344 pig->resv2 = 0; 345 pig->ngrec = 0; 346 return skb; 347} 348 349static int igmpv3_sendpack(struct sk_buff *skb) 350{ 351 struct igmphdr *pig = igmp_hdr(skb); 352 const int igmplen = skb->tail - skb->transport_header; 353 354 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 355 356 return ip_local_out(skb); 357} 358 359static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 360{ 361 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 362} 363 364static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 365 int type, struct igmpv3_grec **ppgr) 366{ 367 struct net_device *dev = pmc->interface->dev; 368 struct igmpv3_report *pih; 369 struct igmpv3_grec *pgr; 370 371 if (!skb) 372 skb = igmpv3_newpack(dev, dev->mtu); 373 if (!skb) 374 return NULL; 375 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 376 pgr->grec_type = type; 377 pgr->grec_auxwords = 0; 378 pgr->grec_nsrcs = 0; 379 pgr->grec_mca = pmc->multiaddr; 380 pih = igmpv3_report_hdr(skb); 381 pih->ngrec = htons(ntohs(pih->ngrec)+1); 382 *ppgr = pgr; 383 return skb; 384} 385 386#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 387 skb_tailroom(skb)) : 0) 388 389static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 390 int type, int gdeleted, int sdeleted) 391{ 392 struct net_device *dev = pmc->interface->dev; 393 struct igmpv3_report *pih; 394 struct igmpv3_grec *pgr = NULL; 395 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 396 int scount, stotal, first, isquery, truncate; 397 398 if (pmc->multiaddr == IGMP_ALL_HOSTS) 399 return skb; 400 401 isquery = type == IGMPV3_MODE_IS_INCLUDE || 402 type == IGMPV3_MODE_IS_EXCLUDE; 403 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 404 type == IGMPV3_CHANGE_TO_EXCLUDE; 405 406 stotal = scount = 0; 407 408 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 409 410 if (!*psf_list) 411 goto empty_source; 412 413 pih = skb ? igmpv3_report_hdr(skb) : NULL; 414 415 /* EX and TO_EX get a fresh packet, if needed */ 416 if (truncate) { 417 if (pih && pih->ngrec && 418 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 419 if (skb) 420 igmpv3_sendpack(skb); 421 skb = igmpv3_newpack(dev, dev->mtu); 422 } 423 } 424 first = 1; 425 psf_prev = NULL; 426 for (psf=*psf_list; psf; psf=psf_next) { 427 __be32 *psrc; 428 429 psf_next = psf->sf_next; 430 431 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 432 psf_prev = psf; 433 continue; 434 } 435 436 /* clear marks on query responses */ 437 if (isquery) 438 psf->sf_gsresp = 0; 439 440 if (AVAILABLE(skb) < sizeof(__be32) + 441 first*sizeof(struct igmpv3_grec)) { 442 if (truncate && !first) 443 break; /* truncate these */ 444 if (pgr) 445 pgr->grec_nsrcs = htons(scount); 446 if (skb) 447 igmpv3_sendpack(skb); 448 skb = igmpv3_newpack(dev, dev->mtu); 449 first = 1; 450 scount = 0; 451 } 452 if (first) { 453 skb = add_grhead(skb, pmc, type, &pgr); 454 first = 0; 455 } 456 if (!skb) 457 return NULL; 458 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 459 *psrc = psf->sf_inaddr; 460 scount++; stotal++; 461 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 462 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 463 psf->sf_crcount--; 464 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 465 if (psf_prev) 466 psf_prev->sf_next = psf->sf_next; 467 else 468 *psf_list = psf->sf_next; 469 kfree(psf); 470 continue; 471 } 472 } 473 psf_prev = psf; 474 } 475 476empty_source: 477 if (!stotal) { 478 if (type == IGMPV3_ALLOW_NEW_SOURCES || 479 type == IGMPV3_BLOCK_OLD_SOURCES) 480 return skb; 481 if (pmc->crcount || isquery) { 482 /* make sure we have room for group header */ 483 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 484 igmpv3_sendpack(skb); 485 skb = NULL; /* add_grhead will get a new one */ 486 } 487 skb = add_grhead(skb, pmc, type, &pgr); 488 } 489 } 490 if (pgr) 491 pgr->grec_nsrcs = htons(scount); 492 493 if (isquery) 494 pmc->gsquery = 0; /* clear query state on report */ 495 return skb; 496} 497 498static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 499{ 500 struct sk_buff *skb = NULL; 501 int type; 502 503 if (!pmc) { 504 read_lock(&in_dev->mc_list_lock); 505 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 506 if (pmc->multiaddr == IGMP_ALL_HOSTS) 507 continue; 508 spin_lock_bh(&pmc->lock); 509 if (pmc->sfcount[MCAST_EXCLUDE]) 510 type = IGMPV3_MODE_IS_EXCLUDE; 511 else 512 type = IGMPV3_MODE_IS_INCLUDE; 513 skb = add_grec(skb, pmc, type, 0, 0); 514 spin_unlock_bh(&pmc->lock); 515 } 516 read_unlock(&in_dev->mc_list_lock); 517 } else { 518 spin_lock_bh(&pmc->lock); 519 if (pmc->sfcount[MCAST_EXCLUDE]) 520 type = IGMPV3_MODE_IS_EXCLUDE; 521 else 522 type = IGMPV3_MODE_IS_INCLUDE; 523 skb = add_grec(skb, pmc, type, 0, 0); 524 spin_unlock_bh(&pmc->lock); 525 } 526 if (!skb) 527 return 0; 528 return igmpv3_sendpack(skb); 529} 530 531/* 532 * remove zero-count source records from a source filter list 533 */ 534static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 535{ 536 struct ip_sf_list *psf_prev, *psf_next, *psf; 537 538 psf_prev = NULL; 539 for (psf=*ppsf; psf; psf = psf_next) { 540 psf_next = psf->sf_next; 541 if (psf->sf_crcount == 0) { 542 if (psf_prev) 543 psf_prev->sf_next = psf->sf_next; 544 else 545 *ppsf = psf->sf_next; 546 kfree(psf); 547 } else 548 psf_prev = psf; 549 } 550} 551 552static void igmpv3_send_cr(struct in_device *in_dev) 553{ 554 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 555 struct sk_buff *skb = NULL; 556 int type, dtype; 557 558 read_lock(&in_dev->mc_list_lock); 559 spin_lock_bh(&in_dev->mc_tomb_lock); 560 561 /* deleted MCA's */ 562 pmc_prev = NULL; 563 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 564 pmc_next = pmc->next; 565 if (pmc->sfmode == MCAST_INCLUDE) { 566 type = IGMPV3_BLOCK_OLD_SOURCES; 567 dtype = IGMPV3_BLOCK_OLD_SOURCES; 568 skb = add_grec(skb, pmc, type, 1, 0); 569 skb = add_grec(skb, pmc, dtype, 1, 1); 570 } 571 if (pmc->crcount) { 572 if (pmc->sfmode == MCAST_EXCLUDE) { 573 type = IGMPV3_CHANGE_TO_INCLUDE; 574 skb = add_grec(skb, pmc, type, 1, 0); 575 } 576 pmc->crcount--; 577 if (pmc->crcount == 0) { 578 igmpv3_clear_zeros(&pmc->tomb); 579 igmpv3_clear_zeros(&pmc->sources); 580 } 581 } 582 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 583 if (pmc_prev) 584 pmc_prev->next = pmc_next; 585 else 586 in_dev->mc_tomb = pmc_next; 587 in_dev_put(pmc->interface); 588 kfree(pmc); 589 } else 590 pmc_prev = pmc; 591 } 592 spin_unlock_bh(&in_dev->mc_tomb_lock); 593 594 /* change recs */ 595 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 596 spin_lock_bh(&pmc->lock); 597 if (pmc->sfcount[MCAST_EXCLUDE]) { 598 type = IGMPV3_BLOCK_OLD_SOURCES; 599 dtype = IGMPV3_ALLOW_NEW_SOURCES; 600 } else { 601 type = IGMPV3_ALLOW_NEW_SOURCES; 602 dtype = IGMPV3_BLOCK_OLD_SOURCES; 603 } 604 skb = add_grec(skb, pmc, type, 0, 0); 605 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 606 607 /* filter mode changes */ 608 if (pmc->crcount) { 609 if (pmc->sfmode == MCAST_EXCLUDE) 610 type = IGMPV3_CHANGE_TO_EXCLUDE; 611 else 612 type = IGMPV3_CHANGE_TO_INCLUDE; 613 skb = add_grec(skb, pmc, type, 0, 0); 614 pmc->crcount--; 615 } 616 spin_unlock_bh(&pmc->lock); 617 } 618 read_unlock(&in_dev->mc_list_lock); 619 620 if (!skb) 621 return; 622 (void) igmpv3_sendpack(skb); 623} 624 625static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 626 int type) 627{ 628 struct sk_buff *skb; 629 struct iphdr *iph; 630 struct igmphdr *ih; 631 struct rtable *rt; 632 struct net_device *dev = in_dev->dev; 633 struct net *net = dev_net(dev); 634 __be32 group = pmc ? pmc->multiaddr : 0; 635 __be32 dst; 636 637 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 638 return igmpv3_send_report(in_dev, pmc); 639 else if (type == IGMP_HOST_LEAVE_MESSAGE) 640 dst = IGMP_ALL_ROUTER; 641 else 642 dst = group; 643 644 { 645 struct flowi fl = { .oif = dev->ifindex, 646 .nl_u = { .ip4_u = { .daddr = dst } }, 647 .proto = IPPROTO_IGMP }; 648 if (ip_route_output_key(net, &rt, &fl)) 649 return -1; 650 } 651 if (rt->rt_src == 0) { 652 ip_rt_put(rt); 653 return -1; 654 } 655 656 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 657 if (skb == NULL) { 658 ip_rt_put(rt); 659 return -1; 660 } 661 662 skb->dst = &rt->u.dst; 663 664 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 665 666 skb_reset_network_header(skb); 667 iph = ip_hdr(skb); 668 skb_put(skb, sizeof(struct iphdr) + 4); 669 670 iph->version = 4; 671 iph->ihl = (sizeof(struct iphdr)+4)>>2; 672 iph->tos = 0xc0; 673 iph->frag_off = htons(IP_DF); 674 iph->ttl = 1; 675 iph->daddr = dst; 676 iph->saddr = rt->rt_src; 677 iph->protocol = IPPROTO_IGMP; 678 ip_select_ident(iph, &rt->u.dst, NULL); 679 ((u8*)&iph[1])[0] = IPOPT_RA; 680 ((u8*)&iph[1])[1] = 4; 681 ((u8*)&iph[1])[2] = 0; 682 ((u8*)&iph[1])[3] = 0; 683 684 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 685 ih->type = type; 686 ih->code = 0; 687 ih->csum = 0; 688 ih->group = group; 689 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 690 691 return ip_local_out(skb); 692} 693 694static void igmp_gq_timer_expire(unsigned long data) 695{ 696 struct in_device *in_dev = (struct in_device *)data; 697 698 in_dev->mr_gq_running = 0; 699 igmpv3_send_report(in_dev, NULL); 700 __in_dev_put(in_dev); 701} 702 703static void igmp_ifc_timer_expire(unsigned long data) 704{ 705 struct in_device *in_dev = (struct in_device *)data; 706 707 igmpv3_send_cr(in_dev); 708 if (in_dev->mr_ifc_count) { 709 in_dev->mr_ifc_count--; 710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 711 } 712 __in_dev_put(in_dev); 713} 714 715static void igmp_ifc_event(struct in_device *in_dev) 716{ 717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 718 return; 719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 720 IGMP_Unsolicited_Report_Count; 721 igmp_ifc_start_timer(in_dev, 1); 722} 723 724 725static void igmp_timer_expire(unsigned long data) 726{ 727 struct ip_mc_list *im=(struct ip_mc_list *)data; 728 struct in_device *in_dev = im->interface; 729 730 spin_lock(&im->lock); 731 im->tm_running = 0; 732 733 if (im->unsolicit_count) { 734 im->unsolicit_count--; 735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 736 } 737 im->reporter = 1; 738 spin_unlock(&im->lock); 739 740 if (IGMP_V1_SEEN(in_dev)) 741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 742 else if (IGMP_V2_SEEN(in_dev)) 743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 744 else 745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 746 747 ip_ma_put(im); 748} 749 750/* mark EXCLUDE-mode sources */ 751static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 752{ 753 struct ip_sf_list *psf; 754 int i, scount; 755 756 scount = 0; 757 for (psf=pmc->sources; psf; psf=psf->sf_next) { 758 if (scount == nsrcs) 759 break; 760 for (i=0; i<nsrcs; i++) { 761 /* skip inactive filters */ 762 if (pmc->sfcount[MCAST_INCLUDE] || 763 pmc->sfcount[MCAST_EXCLUDE] != 764 psf->sf_count[MCAST_EXCLUDE]) 765 continue; 766 if (srcs[i] == psf->sf_inaddr) { 767 scount++; 768 break; 769 } 770 } 771 } 772 pmc->gsquery = 0; 773 if (scount == nsrcs) /* all sources excluded */ 774 return 0; 775 return 1; 776} 777 778static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 779{ 780 struct ip_sf_list *psf; 781 int i, scount; 782 783 if (pmc->sfmode == MCAST_EXCLUDE) 784 return igmp_xmarksources(pmc, nsrcs, srcs); 785 786 /* mark INCLUDE-mode sources */ 787 scount = 0; 788 for (psf=pmc->sources; psf; psf=psf->sf_next) { 789 if (scount == nsrcs) 790 break; 791 for (i=0; i<nsrcs; i++) 792 if (srcs[i] == psf->sf_inaddr) { 793 psf->sf_gsresp = 1; 794 scount++; 795 break; 796 } 797 } 798 if (!scount) { 799 pmc->gsquery = 0; 800 return 0; 801 } 802 pmc->gsquery = 1; 803 return 1; 804} 805 806static void igmp_heard_report(struct in_device *in_dev, __be32 group) 807{ 808 struct ip_mc_list *im; 809 810 /* Timers are only set for non-local groups */ 811 812 if (group == IGMP_ALL_HOSTS) 813 return; 814 815 read_lock(&in_dev->mc_list_lock); 816 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 817 if (im->multiaddr == group) { 818 igmp_stop_timer(im); 819 break; 820 } 821 } 822 read_unlock(&in_dev->mc_list_lock); 823} 824 825static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 826 int len) 827{ 828 struct igmphdr *ih = igmp_hdr(skb); 829 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 830 struct ip_mc_list *im; 831 __be32 group = ih->group; 832 int max_delay; 833 int mark = 0; 834 835 836 if (len == 8) { 837 if (ih->code == 0) { 838 /* Alas, old v1 router presents here. */ 839 840 max_delay = IGMP_Query_Response_Interval; 841 in_dev->mr_v1_seen = jiffies + 842 IGMP_V1_Router_Present_Timeout; 843 group = 0; 844 } else { 845 /* v2 router present */ 846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 847 in_dev->mr_v2_seen = jiffies + 848 IGMP_V2_Router_Present_Timeout; 849 } 850 /* cancel the interface change timer */ 851 in_dev->mr_ifc_count = 0; 852 if (del_timer(&in_dev->mr_ifc_timer)) 853 __in_dev_put(in_dev); 854 /* clear deleted report items */ 855 igmpv3_clear_delrec(in_dev); 856 } else if (len < 12) { 857 return; /* ignore bogus packet; freed by caller */ 858 } else { /* v3 */ 859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 860 return; 861 862 ih3 = igmpv3_query_hdr(skb); 863 if (ih3->nsrcs) { 864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 865 + ntohs(ih3->nsrcs)*sizeof(__be32))) 866 return; 867 ih3 = igmpv3_query_hdr(skb); 868 } 869 870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 871 if (!max_delay) 872 max_delay = 1; /* can't mod w/ 0 */ 873 in_dev->mr_maxdelay = max_delay; 874 if (ih3->qrv) 875 in_dev->mr_qrv = ih3->qrv; 876 if (!group) { /* general query */ 877 if (ih3->nsrcs) 878 return; /* no sources allowed */ 879 igmp_gq_start_timer(in_dev); 880 return; 881 } 882 /* mark sources to include, if group & source-specific */ 883 mark = ih3->nsrcs != 0; 884 } 885 886 /* 887 * - Start the timers in all of our membership records 888 * that the query applies to for the interface on 889 * which the query arrived excl. those that belong 890 * to a "local" group (224.0.0.X) 891 * - For timers already running check if they need to 892 * be reset. 893 * - Use the igmp->igmp_code field as the maximum 894 * delay possible 895 */ 896 read_lock(&in_dev->mc_list_lock); 897 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 898 int changed; 899 900 if (group && group != im->multiaddr) 901 continue; 902 if (im->multiaddr == IGMP_ALL_HOSTS) 903 continue; 904 spin_lock_bh(&im->lock); 905 if (im->tm_running) 906 im->gsquery = im->gsquery && mark; 907 else 908 im->gsquery = mark; 909 changed = !im->gsquery || 910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 911 spin_unlock_bh(&im->lock); 912 if (changed) 913 igmp_mod_timer(im, max_delay); 914 } 915 read_unlock(&in_dev->mc_list_lock); 916} 917 918int igmp_rcv(struct sk_buff *skb) 919{ 920 /* This basically follows the spec line by line -- see RFC1112 */ 921 struct igmphdr *ih; 922 struct in_device *in_dev = in_dev_get(skb->dev); 923 int len = skb->len; 924 925 if (in_dev == NULL) 926 goto drop; 927 928 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 929 goto drop_ref; 930 931 switch (skb->ip_summed) { 932 case CHECKSUM_COMPLETE: 933 if (!csum_fold(skb->csum)) 934 break; 935 /* fall through */ 936 case CHECKSUM_NONE: 937 skb->csum = 0; 938 if (__skb_checksum_complete(skb)) 939 goto drop_ref; 940 } 941 942 ih = igmp_hdr(skb); 943 switch (ih->type) { 944 case IGMP_HOST_MEMBERSHIP_QUERY: 945 igmp_heard_query(in_dev, skb, len); 946 break; 947 case IGMP_HOST_MEMBERSHIP_REPORT: 948 case IGMPV2_HOST_MEMBERSHIP_REPORT: 949 case IGMPV3_HOST_MEMBERSHIP_REPORT: 950 /* Is it our report looped back? */ 951 if (skb->rtable->fl.iif == 0) 952 break; 953 /* don't rely on MC router hearing unicast reports */ 954 if (skb->pkt_type == PACKET_MULTICAST || 955 skb->pkt_type == PACKET_BROADCAST) 956 igmp_heard_report(in_dev, ih->group); 957 break; 958 case IGMP_PIM: 959#ifdef CONFIG_IP_PIMSM_V1 960 in_dev_put(in_dev); 961 return pim_rcv_v1(skb); 962#endif 963 case IGMP_DVMRP: 964 case IGMP_TRACE: 965 case IGMP_HOST_LEAVE_MESSAGE: 966 case IGMP_MTRACE: 967 case IGMP_MTRACE_RESP: 968 break; 969 default: 970 break; 971 } 972 973drop_ref: 974 in_dev_put(in_dev); 975drop: 976 kfree_skb(skb); 977 return 0; 978} 979 980#endif 981 982 983/* 984 * Add a filter to a device 985 */ 986 987static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 988{ 989 char buf[MAX_ADDR_LEN]; 990 struct net_device *dev = in_dev->dev; 991 992 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 993 We will get multicast token leakage, when IFF_MULTICAST 994 is changed. This check should be done in dev->set_multicast_list 995 routine. Something sort of: 996 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 997 --ANK 998 */ 999 if (arp_mc_map(addr, buf, dev, 0) == 0) 1000 dev_mc_add(dev, buf, dev->addr_len, 0); 1001} 1002 1003/* 1004 * Remove a filter from a device 1005 */ 1006 1007static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1008{ 1009 char buf[MAX_ADDR_LEN]; 1010 struct net_device *dev = in_dev->dev; 1011 1012 if (arp_mc_map(addr, buf, dev, 0) == 0) 1013 dev_mc_delete(dev, buf, dev->addr_len, 0); 1014} 1015 1016#ifdef CONFIG_IP_MULTICAST 1017/* 1018 * deleted ip_mc_list manipulation 1019 */ 1020static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1021{ 1022 struct ip_mc_list *pmc; 1023 1024 /* this is an "ip_mc_list" for convenience; only the fields below 1025 * are actually used. In particular, the refcnt and users are not 1026 * used for management of the delete list. Using the same structure 1027 * for deleted items allows change reports to use common code with 1028 * non-deleted or query-response MCA's. 1029 */ 1030 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1031 if (!pmc) 1032 return; 1033 spin_lock_bh(&im->lock); 1034 pmc->interface = im->interface; 1035 in_dev_hold(in_dev); 1036 pmc->multiaddr = im->multiaddr; 1037 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1038 IGMP_Unsolicited_Report_Count; 1039 pmc->sfmode = im->sfmode; 1040 if (pmc->sfmode == MCAST_INCLUDE) { 1041 struct ip_sf_list *psf; 1042 1043 pmc->tomb = im->tomb; 1044 pmc->sources = im->sources; 1045 im->tomb = im->sources = NULL; 1046 for (psf=pmc->sources; psf; psf=psf->sf_next) 1047 psf->sf_crcount = pmc->crcount; 1048 } 1049 spin_unlock_bh(&im->lock); 1050 1051 spin_lock_bh(&in_dev->mc_tomb_lock); 1052 pmc->next = in_dev->mc_tomb; 1053 in_dev->mc_tomb = pmc; 1054 spin_unlock_bh(&in_dev->mc_tomb_lock); 1055} 1056 1057static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1058{ 1059 struct ip_mc_list *pmc, *pmc_prev; 1060 struct ip_sf_list *psf, *psf_next; 1061 1062 spin_lock_bh(&in_dev->mc_tomb_lock); 1063 pmc_prev = NULL; 1064 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1065 if (pmc->multiaddr == multiaddr) 1066 break; 1067 pmc_prev = pmc; 1068 } 1069 if (pmc) { 1070 if (pmc_prev) 1071 pmc_prev->next = pmc->next; 1072 else 1073 in_dev->mc_tomb = pmc->next; 1074 } 1075 spin_unlock_bh(&in_dev->mc_tomb_lock); 1076 if (pmc) { 1077 for (psf=pmc->tomb; psf; psf=psf_next) { 1078 psf_next = psf->sf_next; 1079 kfree(psf); 1080 } 1081 in_dev_put(pmc->interface); 1082 kfree(pmc); 1083 } 1084} 1085 1086static void igmpv3_clear_delrec(struct in_device *in_dev) 1087{ 1088 struct ip_mc_list *pmc, *nextpmc; 1089 1090 spin_lock_bh(&in_dev->mc_tomb_lock); 1091 pmc = in_dev->mc_tomb; 1092 in_dev->mc_tomb = NULL; 1093 spin_unlock_bh(&in_dev->mc_tomb_lock); 1094 1095 for (; pmc; pmc = nextpmc) { 1096 nextpmc = pmc->next; 1097 ip_mc_clear_src(pmc); 1098 in_dev_put(pmc->interface); 1099 kfree(pmc); 1100 } 1101 /* clear dead sources, too */ 1102 read_lock(&in_dev->mc_list_lock); 1103 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1104 struct ip_sf_list *psf, *psf_next; 1105 1106 spin_lock_bh(&pmc->lock); 1107 psf = pmc->tomb; 1108 pmc->tomb = NULL; 1109 spin_unlock_bh(&pmc->lock); 1110 for (; psf; psf=psf_next) { 1111 psf_next = psf->sf_next; 1112 kfree(psf); 1113 } 1114 } 1115 read_unlock(&in_dev->mc_list_lock); 1116} 1117#endif 1118 1119static void igmp_group_dropped(struct ip_mc_list *im) 1120{ 1121 struct in_device *in_dev = im->interface; 1122#ifdef CONFIG_IP_MULTICAST 1123 int reporter; 1124#endif 1125 1126 if (im->loaded) { 1127 im->loaded = 0; 1128 ip_mc_filter_del(in_dev, im->multiaddr); 1129 } 1130 1131#ifdef CONFIG_IP_MULTICAST 1132 if (im->multiaddr == IGMP_ALL_HOSTS) 1133 return; 1134 1135 reporter = im->reporter; 1136 igmp_stop_timer(im); 1137 1138 if (!in_dev->dead) { 1139 if (IGMP_V1_SEEN(in_dev)) 1140 goto done; 1141 if (IGMP_V2_SEEN(in_dev)) { 1142 if (reporter) 1143 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1144 goto done; 1145 } 1146 /* IGMPv3 */ 1147 igmpv3_add_delrec(in_dev, im); 1148 1149 igmp_ifc_event(in_dev); 1150 } 1151done: 1152#endif 1153 ip_mc_clear_src(im); 1154} 1155 1156static void igmp_group_added(struct ip_mc_list *im) 1157{ 1158 struct in_device *in_dev = im->interface; 1159 1160 if (im->loaded == 0) { 1161 im->loaded = 1; 1162 ip_mc_filter_add(in_dev, im->multiaddr); 1163 } 1164 1165#ifdef CONFIG_IP_MULTICAST 1166 if (im->multiaddr == IGMP_ALL_HOSTS) 1167 return; 1168 1169 if (in_dev->dead) 1170 return; 1171 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1172 spin_lock_bh(&im->lock); 1173 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1174 spin_unlock_bh(&im->lock); 1175 return; 1176 } 1177 /* else, v3 */ 1178 1179 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1180 IGMP_Unsolicited_Report_Count; 1181 igmp_ifc_event(in_dev); 1182#endif 1183} 1184 1185 1186/* 1187 * Multicast list managers 1188 */ 1189 1190 1191/* 1192 * A socket has joined a multicast group on device dev. 1193 */ 1194 1195void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1196{ 1197 struct ip_mc_list *im; 1198 1199 ASSERT_RTNL(); 1200 1201 for (im=in_dev->mc_list; im; im=im->next) { 1202 if (im->multiaddr == addr) { 1203 im->users++; 1204 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1205 goto out; 1206 } 1207 } 1208 1209 im = kmalloc(sizeof(*im), GFP_KERNEL); 1210 if (!im) 1211 goto out; 1212 1213 im->users = 1; 1214 im->interface = in_dev; 1215 in_dev_hold(in_dev); 1216 im->multiaddr = addr; 1217 /* initial mode is (EX, empty) */ 1218 im->sfmode = MCAST_EXCLUDE; 1219 im->sfcount[MCAST_INCLUDE] = 0; 1220 im->sfcount[MCAST_EXCLUDE] = 1; 1221 im->sources = NULL; 1222 im->tomb = NULL; 1223 im->crcount = 0; 1224 atomic_set(&im->refcnt, 1); 1225 spin_lock_init(&im->lock); 1226#ifdef CONFIG_IP_MULTICAST 1227 im->tm_running = 0; 1228 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1229 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1230 im->reporter = 0; 1231 im->gsquery = 0; 1232#endif 1233 im->loaded = 0; 1234 write_lock_bh(&in_dev->mc_list_lock); 1235 im->next = in_dev->mc_list; 1236 in_dev->mc_list = im; 1237 in_dev->mc_count++; 1238 write_unlock_bh(&in_dev->mc_list_lock); 1239#ifdef CONFIG_IP_MULTICAST 1240 igmpv3_del_delrec(in_dev, im->multiaddr); 1241#endif 1242 igmp_group_added(im); 1243 if (!in_dev->dead) 1244 ip_rt_multicast_event(in_dev); 1245out: 1246 return; 1247} 1248 1249/* 1250 * Resend IGMP JOIN report; used for bonding. 1251 */ 1252void ip_mc_rejoin_group(struct ip_mc_list *im) 1253{ 1254#ifdef CONFIG_IP_MULTICAST 1255 struct in_device *in_dev = im->interface; 1256 1257 if (im->multiaddr == IGMP_ALL_HOSTS) 1258 return; 1259 1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1262 return; 1263 } 1264 /* else, v3 */ 1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1266 IGMP_Unsolicited_Report_Count; 1267 igmp_ifc_event(in_dev); 1268#endif 1269} 1270 1271/* 1272 * A socket has left a multicast group on device dev 1273 */ 1274 1275void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1276{ 1277 struct ip_mc_list *i, **ip; 1278 1279 ASSERT_RTNL(); 1280 1281 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1282 if (i->multiaddr == addr) { 1283 if (--i->users == 0) { 1284 write_lock_bh(&in_dev->mc_list_lock); 1285 *ip = i->next; 1286 in_dev->mc_count--; 1287 write_unlock_bh(&in_dev->mc_list_lock); 1288 igmp_group_dropped(i); 1289 1290 if (!in_dev->dead) 1291 ip_rt_multicast_event(in_dev); 1292 1293 ip_ma_put(i); 1294 return; 1295 } 1296 break; 1297 } 1298 } 1299} 1300 1301/* Device going down */ 1302 1303void ip_mc_down(struct in_device *in_dev) 1304{ 1305 struct ip_mc_list *i; 1306 1307 ASSERT_RTNL(); 1308 1309 for (i=in_dev->mc_list; i; i=i->next) 1310 igmp_group_dropped(i); 1311 1312#ifdef CONFIG_IP_MULTICAST 1313 in_dev->mr_ifc_count = 0; 1314 if (del_timer(&in_dev->mr_ifc_timer)) 1315 __in_dev_put(in_dev); 1316 in_dev->mr_gq_running = 0; 1317 if (del_timer(&in_dev->mr_gq_timer)) 1318 __in_dev_put(in_dev); 1319 igmpv3_clear_delrec(in_dev); 1320#endif 1321 1322 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1323} 1324 1325void ip_mc_init_dev(struct in_device *in_dev) 1326{ 1327 ASSERT_RTNL(); 1328 1329 in_dev->mc_tomb = NULL; 1330#ifdef CONFIG_IP_MULTICAST 1331 in_dev->mr_gq_running = 0; 1332 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1333 (unsigned long)in_dev); 1334 in_dev->mr_ifc_count = 0; 1335 in_dev->mc_count = 0; 1336 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1337 (unsigned long)in_dev); 1338 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1339#endif 1340 1341 rwlock_init(&in_dev->mc_list_lock); 1342 spin_lock_init(&in_dev->mc_tomb_lock); 1343} 1344 1345/* Device going up */ 1346 1347void ip_mc_up(struct in_device *in_dev) 1348{ 1349 struct ip_mc_list *i; 1350 1351 ASSERT_RTNL(); 1352 1353 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1354 1355 for (i=in_dev->mc_list; i; i=i->next) 1356 igmp_group_added(i); 1357} 1358 1359/* 1360 * Device is about to be destroyed: clean up. 1361 */ 1362 1363void ip_mc_destroy_dev(struct in_device *in_dev) 1364{ 1365 struct ip_mc_list *i; 1366 1367 ASSERT_RTNL(); 1368 1369 /* Deactivate timers */ 1370 ip_mc_down(in_dev); 1371 1372 write_lock_bh(&in_dev->mc_list_lock); 1373 while ((i = in_dev->mc_list) != NULL) { 1374 in_dev->mc_list = i->next; 1375 in_dev->mc_count--; 1376 write_unlock_bh(&in_dev->mc_list_lock); 1377 igmp_group_dropped(i); 1378 ip_ma_put(i); 1379 1380 write_lock_bh(&in_dev->mc_list_lock); 1381 } 1382 write_unlock_bh(&in_dev->mc_list_lock); 1383} 1384 1385static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1386{ 1387 struct flowi fl = { .nl_u = { .ip4_u = 1388 { .daddr = imr->imr_multiaddr.s_addr } } }; 1389 struct rtable *rt; 1390 struct net_device *dev = NULL; 1391 struct in_device *idev = NULL; 1392 1393 if (imr->imr_ifindex) { 1394 idev = inetdev_by_index(net, imr->imr_ifindex); 1395 if (idev) 1396 __in_dev_put(idev); 1397 return idev; 1398 } 1399 if (imr->imr_address.s_addr) { 1400 dev = ip_dev_find(net, imr->imr_address.s_addr); 1401 if (!dev) 1402 return NULL; 1403 dev_put(dev); 1404 } 1405 1406 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1407 dev = rt->u.dst.dev; 1408 ip_rt_put(rt); 1409 } 1410 if (dev) { 1411 imr->imr_ifindex = dev->ifindex; 1412 idev = __in_dev_get_rtnl(dev); 1413 } 1414 return idev; 1415} 1416 1417/* 1418 * Join a socket to a group 1419 */ 1420int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1421int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1422 1423 1424static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1425 __be32 *psfsrc) 1426{ 1427 struct ip_sf_list *psf, *psf_prev; 1428 int rv = 0; 1429 1430 psf_prev = NULL; 1431 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1432 if (psf->sf_inaddr == *psfsrc) 1433 break; 1434 psf_prev = psf; 1435 } 1436 if (!psf || psf->sf_count[sfmode] == 0) { 1437 /* source filter not found, or count wrong => bug */ 1438 return -ESRCH; 1439 } 1440 psf->sf_count[sfmode]--; 1441 if (psf->sf_count[sfmode] == 0) { 1442 ip_rt_multicast_event(pmc->interface); 1443 } 1444 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1445#ifdef CONFIG_IP_MULTICAST 1446 struct in_device *in_dev = pmc->interface; 1447#endif 1448 1449 /* no more filters for this source */ 1450 if (psf_prev) 1451 psf_prev->sf_next = psf->sf_next; 1452 else 1453 pmc->sources = psf->sf_next; 1454#ifdef CONFIG_IP_MULTICAST 1455 if (psf->sf_oldin && 1456 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1457 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1458 IGMP_Unsolicited_Report_Count; 1459 psf->sf_next = pmc->tomb; 1460 pmc->tomb = psf; 1461 rv = 1; 1462 } else 1463#endif 1464 kfree(psf); 1465 } 1466 return rv; 1467} 1468 1469#ifndef CONFIG_IP_MULTICAST 1470#define igmp_ifc_event(x) do { } while (0) 1471#endif 1472 1473static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1474 int sfcount, __be32 *psfsrc, int delta) 1475{ 1476 struct ip_mc_list *pmc; 1477 int changerec = 0; 1478 int i, err; 1479 1480 if (!in_dev) 1481 return -ENODEV; 1482 read_lock(&in_dev->mc_list_lock); 1483 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1484 if (*pmca == pmc->multiaddr) 1485 break; 1486 } 1487 if (!pmc) { 1488 /* MCA not found?? bug */ 1489 read_unlock(&in_dev->mc_list_lock); 1490 return -ESRCH; 1491 } 1492 spin_lock_bh(&pmc->lock); 1493 read_unlock(&in_dev->mc_list_lock); 1494#ifdef CONFIG_IP_MULTICAST 1495 sf_markstate(pmc); 1496#endif 1497 if (!delta) { 1498 err = -EINVAL; 1499 if (!pmc->sfcount[sfmode]) 1500 goto out_unlock; 1501 pmc->sfcount[sfmode]--; 1502 } 1503 err = 0; 1504 for (i=0; i<sfcount; i++) { 1505 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1506 1507 changerec |= rv > 0; 1508 if (!err && rv < 0) 1509 err = rv; 1510 } 1511 if (pmc->sfmode == MCAST_EXCLUDE && 1512 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1513 pmc->sfcount[MCAST_INCLUDE]) { 1514#ifdef CONFIG_IP_MULTICAST 1515 struct ip_sf_list *psf; 1516#endif 1517 1518 /* filter mode change */ 1519 pmc->sfmode = MCAST_INCLUDE; 1520#ifdef CONFIG_IP_MULTICAST 1521 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1522 IGMP_Unsolicited_Report_Count; 1523 in_dev->mr_ifc_count = pmc->crcount; 1524 for (psf=pmc->sources; psf; psf = psf->sf_next) 1525 psf->sf_crcount = 0; 1526 igmp_ifc_event(pmc->interface); 1527 } else if (sf_setstate(pmc) || changerec) { 1528 igmp_ifc_event(pmc->interface); 1529#endif 1530 } 1531out_unlock: 1532 spin_unlock_bh(&pmc->lock); 1533 return err; 1534} 1535 1536/* 1537 * Add multicast single-source filter to the interface list 1538 */ 1539static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1540 __be32 *psfsrc, int delta) 1541{ 1542 struct ip_sf_list *psf, *psf_prev; 1543 1544 psf_prev = NULL; 1545 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1546 if (psf->sf_inaddr == *psfsrc) 1547 break; 1548 psf_prev = psf; 1549 } 1550 if (!psf) { 1551 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1552 if (!psf) 1553 return -ENOBUFS; 1554 psf->sf_inaddr = *psfsrc; 1555 if (psf_prev) { 1556 psf_prev->sf_next = psf; 1557 } else 1558 pmc->sources = psf; 1559 } 1560 psf->sf_count[sfmode]++; 1561 if (psf->sf_count[sfmode] == 1) { 1562 ip_rt_multicast_event(pmc->interface); 1563 } 1564 return 0; 1565} 1566 1567#ifdef CONFIG_IP_MULTICAST 1568static void sf_markstate(struct ip_mc_list *pmc) 1569{ 1570 struct ip_sf_list *psf; 1571 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1572 1573 for (psf=pmc->sources; psf; psf=psf->sf_next) 1574 if (pmc->sfcount[MCAST_EXCLUDE]) { 1575 psf->sf_oldin = mca_xcount == 1576 psf->sf_count[MCAST_EXCLUDE] && 1577 !psf->sf_count[MCAST_INCLUDE]; 1578 } else 1579 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1580} 1581 1582static int sf_setstate(struct ip_mc_list *pmc) 1583{ 1584 struct ip_sf_list *psf, *dpsf; 1585 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1586 int qrv = pmc->interface->mr_qrv; 1587 int new_in, rv; 1588 1589 rv = 0; 1590 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1591 if (pmc->sfcount[MCAST_EXCLUDE]) { 1592 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1593 !psf->sf_count[MCAST_INCLUDE]; 1594 } else 1595 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1596 if (new_in) { 1597 if (!psf->sf_oldin) { 1598 struct ip_sf_list *prev = NULL; 1599 1600 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1601 if (dpsf->sf_inaddr == psf->sf_inaddr) 1602 break; 1603 prev = dpsf; 1604 } 1605 if (dpsf) { 1606 if (prev) 1607 prev->sf_next = dpsf->sf_next; 1608 else 1609 pmc->tomb = dpsf->sf_next; 1610 kfree(dpsf); 1611 } 1612 psf->sf_crcount = qrv; 1613 rv++; 1614 } 1615 } else if (psf->sf_oldin) { 1616 1617 psf->sf_crcount = 0; 1618 /* 1619 * add or update "delete" records if an active filter 1620 * is now inactive 1621 */ 1622 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1623 if (dpsf->sf_inaddr == psf->sf_inaddr) 1624 break; 1625 if (!dpsf) { 1626 dpsf = (struct ip_sf_list *) 1627 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1628 if (!dpsf) 1629 continue; 1630 *dpsf = *psf; 1631 /* pmc->lock held by callers */ 1632 dpsf->sf_next = pmc->tomb; 1633 pmc->tomb = dpsf; 1634 } 1635 dpsf->sf_crcount = qrv; 1636 rv++; 1637 } 1638 } 1639 return rv; 1640} 1641#endif 1642 1643/* 1644 * Add multicast source filter list to the interface list 1645 */ 1646static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1647 int sfcount, __be32 *psfsrc, int delta) 1648{ 1649 struct ip_mc_list *pmc; 1650 int isexclude; 1651 int i, err; 1652 1653 if (!in_dev) 1654 return -ENODEV; 1655 read_lock(&in_dev->mc_list_lock); 1656 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1657 if (*pmca == pmc->multiaddr) 1658 break; 1659 } 1660 if (!pmc) { 1661 /* MCA not found?? bug */ 1662 read_unlock(&in_dev->mc_list_lock); 1663 return -ESRCH; 1664 } 1665 spin_lock_bh(&pmc->lock); 1666 read_unlock(&in_dev->mc_list_lock); 1667 1668#ifdef CONFIG_IP_MULTICAST 1669 sf_markstate(pmc); 1670#endif 1671 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1672 if (!delta) 1673 pmc->sfcount[sfmode]++; 1674 err = 0; 1675 for (i=0; i<sfcount; i++) { 1676 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1677 if (err) 1678 break; 1679 } 1680 if (err) { 1681 int j; 1682 1683 pmc->sfcount[sfmode]--; 1684 for (j=0; j<i; j++) 1685 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1686 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1687#ifdef CONFIG_IP_MULTICAST 1688 struct ip_sf_list *psf; 1689 in_dev = pmc->interface; 1690#endif 1691 1692 /* filter mode change */ 1693 if (pmc->sfcount[MCAST_EXCLUDE]) 1694 pmc->sfmode = MCAST_EXCLUDE; 1695 else if (pmc->sfcount[MCAST_INCLUDE]) 1696 pmc->sfmode = MCAST_INCLUDE; 1697#ifdef CONFIG_IP_MULTICAST 1698 /* else no filters; keep old mode for reports */ 1699 1700 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1701 IGMP_Unsolicited_Report_Count; 1702 in_dev->mr_ifc_count = pmc->crcount; 1703 for (psf=pmc->sources; psf; psf = psf->sf_next) 1704 psf->sf_crcount = 0; 1705 igmp_ifc_event(in_dev); 1706 } else if (sf_setstate(pmc)) { 1707 igmp_ifc_event(in_dev); 1708#endif 1709 } 1710 spin_unlock_bh(&pmc->lock); 1711 return err; 1712} 1713 1714static void ip_mc_clear_src(struct ip_mc_list *pmc) 1715{ 1716 struct ip_sf_list *psf, *nextpsf; 1717 1718 for (psf=pmc->tomb; psf; psf=nextpsf) { 1719 nextpsf = psf->sf_next; 1720 kfree(psf); 1721 } 1722 pmc->tomb = NULL; 1723 for (psf=pmc->sources; psf; psf=nextpsf) { 1724 nextpsf = psf->sf_next; 1725 kfree(psf); 1726 } 1727 pmc->sources = NULL; 1728 pmc->sfmode = MCAST_EXCLUDE; 1729 pmc->sfcount[MCAST_INCLUDE] = 0; 1730 pmc->sfcount[MCAST_EXCLUDE] = 1; 1731} 1732 1733 1734/* 1735 * Join a multicast group 1736 */ 1737int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1738{ 1739 int err; 1740 __be32 addr = imr->imr_multiaddr.s_addr; 1741 struct ip_mc_socklist *iml = NULL, *i; 1742 struct in_device *in_dev; 1743 struct inet_sock *inet = inet_sk(sk); 1744 struct net *net = sock_net(sk); 1745 int ifindex; 1746 int count = 0; 1747 1748 if (!ipv4_is_multicast(addr)) 1749 return -EINVAL; 1750 1751 rtnl_lock(); 1752 1753 in_dev = ip_mc_find_dev(net, imr); 1754 1755 if (!in_dev) { 1756 iml = NULL; 1757 err = -ENODEV; 1758 goto done; 1759 } 1760 1761 err = -EADDRINUSE; 1762 ifindex = imr->imr_ifindex; 1763 for (i = inet->mc_list; i; i = i->next) { 1764 if (i->multi.imr_multiaddr.s_addr == addr && 1765 i->multi.imr_ifindex == ifindex) 1766 goto done; 1767 count++; 1768 } 1769 err = -ENOBUFS; 1770 if (count >= sysctl_igmp_max_memberships) 1771 goto done; 1772 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1773 if (iml == NULL) 1774 goto done; 1775 1776 memcpy(&iml->multi, imr, sizeof(*imr)); 1777 iml->next = inet->mc_list; 1778 iml->sflist = NULL; 1779 iml->sfmode = MCAST_EXCLUDE; 1780 inet->mc_list = iml; 1781 ip_mc_inc_group(in_dev, addr); 1782 err = 0; 1783done: 1784 rtnl_unlock(); 1785 return err; 1786} 1787 1788static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1789 struct in_device *in_dev) 1790{ 1791 int err; 1792 1793 if (iml->sflist == NULL) { 1794 /* any-source empty exclude case */ 1795 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1796 iml->sfmode, 0, NULL, 0); 1797 } 1798 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1799 iml->sfmode, iml->sflist->sl_count, 1800 iml->sflist->sl_addr, 0); 1801 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1802 iml->sflist = NULL; 1803 return err; 1804} 1805 1806/* 1807 * Ask a socket to leave a group. 1808 */ 1809 1810int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1811{ 1812 struct inet_sock *inet = inet_sk(sk); 1813 struct ip_mc_socklist *iml, **imlp; 1814 struct in_device *in_dev; 1815 struct net *net = sock_net(sk); 1816 __be32 group = imr->imr_multiaddr.s_addr; 1817 u32 ifindex; 1818 int ret = -EADDRNOTAVAIL; 1819 1820 rtnl_lock(); 1821 in_dev = ip_mc_find_dev(net, imr); 1822 ifindex = imr->imr_ifindex; 1823 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1824 if (iml->multi.imr_multiaddr.s_addr != group) 1825 continue; 1826 if (ifindex) { 1827 if (iml->multi.imr_ifindex != ifindex) 1828 continue; 1829 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1830 iml->multi.imr_address.s_addr) 1831 continue; 1832 1833 (void) ip_mc_leave_src(sk, iml, in_dev); 1834 1835 *imlp = iml->next; 1836 1837 if (in_dev) 1838 ip_mc_dec_group(in_dev, group); 1839 rtnl_unlock(); 1840 sock_kfree_s(sk, iml, sizeof(*iml)); 1841 return 0; 1842 } 1843 if (!in_dev) 1844 ret = -ENODEV; 1845 rtnl_unlock(); 1846 return ret; 1847} 1848 1849int ip_mc_source(int add, int omode, struct sock *sk, struct 1850 ip_mreq_source *mreqs, int ifindex) 1851{ 1852 int err; 1853 struct ip_mreqn imr; 1854 __be32 addr = mreqs->imr_multiaddr; 1855 struct ip_mc_socklist *pmc; 1856 struct in_device *in_dev = NULL; 1857 struct inet_sock *inet = inet_sk(sk); 1858 struct ip_sf_socklist *psl; 1859 struct net *net = sock_net(sk); 1860 int leavegroup = 0; 1861 int i, j, rv; 1862 1863 if (!ipv4_is_multicast(addr)) 1864 return -EINVAL; 1865 1866 rtnl_lock(); 1867 1868 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1869 imr.imr_address.s_addr = mreqs->imr_interface; 1870 imr.imr_ifindex = ifindex; 1871 in_dev = ip_mc_find_dev(net, &imr); 1872 1873 if (!in_dev) { 1874 err = -ENODEV; 1875 goto done; 1876 } 1877 err = -EADDRNOTAVAIL; 1878 1879 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1880 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1881 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1882 break; 1883 } 1884 if (!pmc) { /* must have a prior join */ 1885 err = -EINVAL; 1886 goto done; 1887 } 1888 /* if a source filter was set, must be the same mode as before */ 1889 if (pmc->sflist) { 1890 if (pmc->sfmode != omode) { 1891 err = -EINVAL; 1892 goto done; 1893 } 1894 } else if (pmc->sfmode != omode) { 1895 /* allow mode switches for empty-set filters */ 1896 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1897 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1898 NULL, 0); 1899 pmc->sfmode = omode; 1900 } 1901 1902 psl = pmc->sflist; 1903 if (!add) { 1904 if (!psl) 1905 goto done; /* err = -EADDRNOTAVAIL */ 1906 rv = !0; 1907 for (i=0; i<psl->sl_count; i++) { 1908 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1909 sizeof(__be32)); 1910 if (rv == 0) 1911 break; 1912 } 1913 if (rv) /* source not found */ 1914 goto done; /* err = -EADDRNOTAVAIL */ 1915 1916 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1917 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1918 leavegroup = 1; 1919 goto done; 1920 } 1921 1922 /* update the interface filter */ 1923 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1924 &mreqs->imr_sourceaddr, 1); 1925 1926 for (j=i+1; j<psl->sl_count; j++) 1927 psl->sl_addr[j-1] = psl->sl_addr[j]; 1928 psl->sl_count--; 1929 err = 0; 1930 goto done; 1931 } 1932 /* else, add a new source to the filter */ 1933 1934 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1935 err = -ENOBUFS; 1936 goto done; 1937 } 1938 if (!psl || psl->sl_count == psl->sl_max) { 1939 struct ip_sf_socklist *newpsl; 1940 int count = IP_SFBLOCK; 1941 1942 if (psl) 1943 count += psl->sl_max; 1944 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1945 if (!newpsl) { 1946 err = -ENOBUFS; 1947 goto done; 1948 } 1949 newpsl->sl_max = count; 1950 newpsl->sl_count = count - IP_SFBLOCK; 1951 if (psl) { 1952 for (i=0; i<psl->sl_count; i++) 1953 newpsl->sl_addr[i] = psl->sl_addr[i]; 1954 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1955 } 1956 pmc->sflist = psl = newpsl; 1957 } 1958 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1959 for (i=0; i<psl->sl_count; i++) { 1960 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1961 sizeof(__be32)); 1962 if (rv == 0) 1963 break; 1964 } 1965 if (rv == 0) /* address already there is an error */ 1966 goto done; 1967 for (j=psl->sl_count-1; j>=i; j--) 1968 psl->sl_addr[j+1] = psl->sl_addr[j]; 1969 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1970 psl->sl_count++; 1971 err = 0; 1972 /* update the interface list */ 1973 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1974 &mreqs->imr_sourceaddr, 1); 1975done: 1976 rtnl_unlock(); 1977 if (leavegroup) 1978 return ip_mc_leave_group(sk, &imr); 1979 return err; 1980} 1981 1982int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1983{ 1984 int err = 0; 1985 struct ip_mreqn imr; 1986 __be32 addr = msf->imsf_multiaddr; 1987 struct ip_mc_socklist *pmc; 1988 struct in_device *in_dev; 1989 struct inet_sock *inet = inet_sk(sk); 1990 struct ip_sf_socklist *newpsl, *psl; 1991 struct net *net = sock_net(sk); 1992 int leavegroup = 0; 1993 1994 if (!ipv4_is_multicast(addr)) 1995 return -EINVAL; 1996 if (msf->imsf_fmode != MCAST_INCLUDE && 1997 msf->imsf_fmode != MCAST_EXCLUDE) 1998 return -EINVAL; 1999 2000 rtnl_lock(); 2001 2002 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2003 imr.imr_address.s_addr = msf->imsf_interface; 2004 imr.imr_ifindex = ifindex; 2005 in_dev = ip_mc_find_dev(net, &imr); 2006 2007 if (!in_dev) { 2008 err = -ENODEV; 2009 goto done; 2010 } 2011 2012 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2013 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2014 leavegroup = 1; 2015 goto done; 2016 } 2017 2018 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2019 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2020 pmc->multi.imr_ifindex == imr.imr_ifindex) 2021 break; 2022 } 2023 if (!pmc) { /* must have a prior join */ 2024 err = -EINVAL; 2025 goto done; 2026 } 2027 if (msf->imsf_numsrc) { 2028 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2029 GFP_KERNEL); 2030 if (!newpsl) { 2031 err = -ENOBUFS; 2032 goto done; 2033 } 2034 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2035 memcpy(newpsl->sl_addr, msf->imsf_slist, 2036 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2037 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2038 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2039 if (err) { 2040 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2041 goto done; 2042 } 2043 } else { 2044 newpsl = NULL; 2045 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2046 msf->imsf_fmode, 0, NULL, 0); 2047 } 2048 psl = pmc->sflist; 2049 if (psl) { 2050 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2051 psl->sl_count, psl->sl_addr, 0); 2052 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2053 } else 2054 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2055 0, NULL, 0); 2056 pmc->sflist = newpsl; 2057 pmc->sfmode = msf->imsf_fmode; 2058 err = 0; 2059done: 2060 rtnl_unlock(); 2061 if (leavegroup) 2062 err = ip_mc_leave_group(sk, &imr); 2063 return err; 2064} 2065 2066int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2067 struct ip_msfilter __user *optval, int __user *optlen) 2068{ 2069 int err, len, count, copycount; 2070 struct ip_mreqn imr; 2071 __be32 addr = msf->imsf_multiaddr; 2072 struct ip_mc_socklist *pmc; 2073 struct in_device *in_dev; 2074 struct inet_sock *inet = inet_sk(sk); 2075 struct ip_sf_socklist *psl; 2076 struct net *net = sock_net(sk); 2077 2078 if (!ipv4_is_multicast(addr)) 2079 return -EINVAL; 2080 2081 rtnl_lock(); 2082 2083 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2084 imr.imr_address.s_addr = msf->imsf_interface; 2085 imr.imr_ifindex = 0; 2086 in_dev = ip_mc_find_dev(net, &imr); 2087 2088 if (!in_dev) { 2089 err = -ENODEV; 2090 goto done; 2091 } 2092 err = -EADDRNOTAVAIL; 2093 2094 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2095 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2096 pmc->multi.imr_ifindex == imr.imr_ifindex) 2097 break; 2098 } 2099 if (!pmc) /* must have a prior join */ 2100 goto done; 2101 msf->imsf_fmode = pmc->sfmode; 2102 psl = pmc->sflist; 2103 rtnl_unlock(); 2104 if (!psl) { 2105 len = 0; 2106 count = 0; 2107 } else { 2108 count = psl->sl_count; 2109 } 2110 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2111 len = copycount * sizeof(psl->sl_addr[0]); 2112 msf->imsf_numsrc = count; 2113 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2114 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2115 return -EFAULT; 2116 } 2117 if (len && 2118 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2119 return -EFAULT; 2120 return 0; 2121done: 2122 rtnl_unlock(); 2123 return err; 2124} 2125 2126int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2127 struct group_filter __user *optval, int __user *optlen) 2128{ 2129 int err, i, count, copycount; 2130 struct sockaddr_in *psin; 2131 __be32 addr; 2132 struct ip_mc_socklist *pmc; 2133 struct inet_sock *inet = inet_sk(sk); 2134 struct ip_sf_socklist *psl; 2135 2136 psin = (struct sockaddr_in *)&gsf->gf_group; 2137 if (psin->sin_family != AF_INET) 2138 return -EINVAL; 2139 addr = psin->sin_addr.s_addr; 2140 if (!ipv4_is_multicast(addr)) 2141 return -EINVAL; 2142 2143 rtnl_lock(); 2144 2145 err = -EADDRNOTAVAIL; 2146 2147 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2148 if (pmc->multi.imr_multiaddr.s_addr == addr && 2149 pmc->multi.imr_ifindex == gsf->gf_interface) 2150 break; 2151 } 2152 if (!pmc) /* must have a prior join */ 2153 goto done; 2154 gsf->gf_fmode = pmc->sfmode; 2155 psl = pmc->sflist; 2156 rtnl_unlock(); 2157 count = psl ? psl->sl_count : 0; 2158 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2159 gsf->gf_numsrc = count; 2160 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2161 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2162 return -EFAULT; 2163 } 2164 for (i=0; i<copycount; i++) { 2165 struct sockaddr_storage ss; 2166 2167 psin = (struct sockaddr_in *)&ss; 2168 memset(&ss, 0, sizeof(ss)); 2169 psin->sin_family = AF_INET; 2170 psin->sin_addr.s_addr = psl->sl_addr[i]; 2171 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2172 return -EFAULT; 2173 } 2174 return 0; 2175done: 2176 rtnl_unlock(); 2177 return err; 2178} 2179 2180/* 2181 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2182 */ 2183int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2184{ 2185 struct inet_sock *inet = inet_sk(sk); 2186 struct ip_mc_socklist *pmc; 2187 struct ip_sf_socklist *psl; 2188 int i; 2189 2190 if (!ipv4_is_multicast(loc_addr)) 2191 return 1; 2192 2193 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2194 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2195 pmc->multi.imr_ifindex == dif) 2196 break; 2197 } 2198 if (!pmc) 2199 return 1; 2200 psl = pmc->sflist; 2201 if (!psl) 2202 return pmc->sfmode == MCAST_EXCLUDE; 2203 2204 for (i=0; i<psl->sl_count; i++) { 2205 if (psl->sl_addr[i] == rmt_addr) 2206 break; 2207 } 2208 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2209 return 0; 2210 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2211 return 0; 2212 return 1; 2213} 2214 2215/* 2216 * A socket is closing. 2217 */ 2218 2219void ip_mc_drop_socket(struct sock *sk) 2220{ 2221 struct inet_sock *inet = inet_sk(sk); 2222 struct ip_mc_socklist *iml; 2223 struct net *net = sock_net(sk); 2224 2225 if (inet->mc_list == NULL) 2226 return; 2227 2228 rtnl_lock(); 2229 while ((iml = inet->mc_list) != NULL) { 2230 struct in_device *in_dev; 2231 inet->mc_list = iml->next; 2232 2233 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2234 (void) ip_mc_leave_src(sk, iml, in_dev); 2235 if (in_dev != NULL) { 2236 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2237 in_dev_put(in_dev); 2238 } 2239 sock_kfree_s(sk, iml, sizeof(*iml)); 2240 } 2241 rtnl_unlock(); 2242} 2243 2244int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2245{ 2246 struct ip_mc_list *im; 2247 struct ip_sf_list *psf; 2248 int rv = 0; 2249 2250 read_lock(&in_dev->mc_list_lock); 2251 for (im=in_dev->mc_list; im; im=im->next) { 2252 if (im->multiaddr == mc_addr) 2253 break; 2254 } 2255 if (im && proto == IPPROTO_IGMP) { 2256 rv = 1; 2257 } else if (im) { 2258 if (src_addr) { 2259 for (psf=im->sources; psf; psf=psf->sf_next) { 2260 if (psf->sf_inaddr == src_addr) 2261 break; 2262 } 2263 if (psf) 2264 rv = psf->sf_count[MCAST_INCLUDE] || 2265 psf->sf_count[MCAST_EXCLUDE] != 2266 im->sfcount[MCAST_EXCLUDE]; 2267 else 2268 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2269 } else 2270 rv = 1; /* unspecified source; tentatively allow */ 2271 } 2272 read_unlock(&in_dev->mc_list_lock); 2273 return rv; 2274} 2275 2276#if defined(CONFIG_PROC_FS) 2277struct igmp_mc_iter_state { 2278 struct seq_net_private p; 2279 struct net_device *dev; 2280 struct in_device *in_dev; 2281}; 2282 2283#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2284 2285static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2286{ 2287 struct net *net = seq_file_net(seq); 2288 struct ip_mc_list *im = NULL; 2289 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2290 2291 state->in_dev = NULL; 2292 for_each_netdev(net, state->dev) { 2293 struct in_device *in_dev; 2294 in_dev = in_dev_get(state->dev); 2295 if (!in_dev) 2296 continue; 2297 read_lock(&in_dev->mc_list_lock); 2298 im = in_dev->mc_list; 2299 if (im) { 2300 state->in_dev = in_dev; 2301 break; 2302 } 2303 read_unlock(&in_dev->mc_list_lock); 2304 in_dev_put(in_dev); 2305 } 2306 return im; 2307} 2308 2309static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2310{ 2311 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2312 im = im->next; 2313 while (!im) { 2314 if (likely(state->in_dev != NULL)) { 2315 read_unlock(&state->in_dev->mc_list_lock); 2316 in_dev_put(state->in_dev); 2317 } 2318 state->dev = next_net_device(state->dev); 2319 if (!state->dev) { 2320 state->in_dev = NULL; 2321 break; 2322 } 2323 state->in_dev = in_dev_get(state->dev); 2324 if (!state->in_dev) 2325 continue; 2326 read_lock(&state->in_dev->mc_list_lock); 2327 im = state->in_dev->mc_list; 2328 } 2329 return im; 2330} 2331 2332static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2333{ 2334 struct ip_mc_list *im = igmp_mc_get_first(seq); 2335 if (im) 2336 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2337 --pos; 2338 return pos ? NULL : im; 2339} 2340 2341static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2342 __acquires(dev_base_lock) 2343{ 2344 read_lock(&dev_base_lock); 2345 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2346} 2347 2348static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2349{ 2350 struct ip_mc_list *im; 2351 if (v == SEQ_START_TOKEN) 2352 im = igmp_mc_get_first(seq); 2353 else 2354 im = igmp_mc_get_next(seq, v); 2355 ++*pos; 2356 return im; 2357} 2358 2359static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2360 __releases(dev_base_lock) 2361{ 2362 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2363 if (likely(state->in_dev != NULL)) { 2364 read_unlock(&state->in_dev->mc_list_lock); 2365 in_dev_put(state->in_dev); 2366 state->in_dev = NULL; 2367 } 2368 state->dev = NULL; 2369 read_unlock(&dev_base_lock); 2370} 2371 2372static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2373{ 2374 if (v == SEQ_START_TOKEN) 2375 seq_puts(seq, 2376 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2377 else { 2378 struct ip_mc_list *im = (struct ip_mc_list *)v; 2379 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2380 char *querier; 2381#ifdef CONFIG_IP_MULTICAST 2382 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2383 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2384 "V3"; 2385#else 2386 querier = "NONE"; 2387#endif 2388 2389 if (state->in_dev->mc_list == im) { 2390 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2391 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2392 } 2393 2394 seq_printf(seq, 2395 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2396 im->multiaddr, im->users, 2397 im->tm_running, im->tm_running ? 2398 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2399 im->reporter); 2400 } 2401 return 0; 2402} 2403 2404static const struct seq_operations igmp_mc_seq_ops = { 2405 .start = igmp_mc_seq_start, 2406 .next = igmp_mc_seq_next, 2407 .stop = igmp_mc_seq_stop, 2408 .show = igmp_mc_seq_show, 2409}; 2410 2411static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2412{ 2413 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2414 sizeof(struct igmp_mc_iter_state)); 2415} 2416 2417static const struct file_operations igmp_mc_seq_fops = { 2418 .owner = THIS_MODULE, 2419 .open = igmp_mc_seq_open, 2420 .read = seq_read, 2421 .llseek = seq_lseek, 2422 .release = seq_release_net, 2423}; 2424 2425struct igmp_mcf_iter_state { 2426 struct seq_net_private p; 2427 struct net_device *dev; 2428 struct in_device *idev; 2429 struct ip_mc_list *im; 2430}; 2431 2432#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2433 2434static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2435{ 2436 struct net *net = seq_file_net(seq); 2437 struct ip_sf_list *psf = NULL; 2438 struct ip_mc_list *im = NULL; 2439 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2440 2441 state->idev = NULL; 2442 state->im = NULL; 2443 for_each_netdev(net, state->dev) { 2444 struct in_device *idev; 2445 idev = in_dev_get(state->dev); 2446 if (unlikely(idev == NULL)) 2447 continue; 2448 read_lock(&idev->mc_list_lock); 2449 im = idev->mc_list; 2450 if (likely(im != NULL)) { 2451 spin_lock_bh(&im->lock); 2452 psf = im->sources; 2453 if (likely(psf != NULL)) { 2454 state->im = im; 2455 state->idev = idev; 2456 break; 2457 } 2458 spin_unlock_bh(&im->lock); 2459 } 2460 read_unlock(&idev->mc_list_lock); 2461 in_dev_put(idev); 2462 } 2463 return psf; 2464} 2465 2466static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2467{ 2468 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2469 2470 psf = psf->sf_next; 2471 while (!psf) { 2472 spin_unlock_bh(&state->im->lock); 2473 state->im = state->im->next; 2474 while (!state->im) { 2475 if (likely(state->idev != NULL)) { 2476 read_unlock(&state->idev->mc_list_lock); 2477 in_dev_put(state->idev); 2478 } 2479 state->dev = next_net_device(state->dev); 2480 if (!state->dev) { 2481 state->idev = NULL; 2482 goto out; 2483 } 2484 state->idev = in_dev_get(state->dev); 2485 if (!state->idev) 2486 continue; 2487 read_lock(&state->idev->mc_list_lock); 2488 state->im = state->idev->mc_list; 2489 } 2490 if (!state->im) 2491 break; 2492 spin_lock_bh(&state->im->lock); 2493 psf = state->im->sources; 2494 } 2495out: 2496 return psf; 2497} 2498 2499static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2500{ 2501 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2502 if (psf) 2503 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2504 --pos; 2505 return pos ? NULL : psf; 2506} 2507 2508static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2509{ 2510 read_lock(&dev_base_lock); 2511 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2512} 2513 2514static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2515{ 2516 struct ip_sf_list *psf; 2517 if (v == SEQ_START_TOKEN) 2518 psf = igmp_mcf_get_first(seq); 2519 else 2520 psf = igmp_mcf_get_next(seq, v); 2521 ++*pos; 2522 return psf; 2523} 2524 2525static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2526{ 2527 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2528 if (likely(state->im != NULL)) { 2529 spin_unlock_bh(&state->im->lock); 2530 state->im = NULL; 2531 } 2532 if (likely(state->idev != NULL)) { 2533 read_unlock(&state->idev->mc_list_lock); 2534 in_dev_put(state->idev); 2535 state->idev = NULL; 2536 } 2537 state->dev = NULL; 2538 read_unlock(&dev_base_lock); 2539} 2540 2541static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2542{ 2543 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2544 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2545 2546 if (v == SEQ_START_TOKEN) { 2547 seq_printf(seq, 2548 "%3s %6s " 2549 "%10s %10s %6s %6s\n", "Idx", 2550 "Device", "MCA", 2551 "SRC", "INC", "EXC"); 2552 } else { 2553 seq_printf(seq, 2554 "%3d %6.6s 0x%08x " 2555 "0x%08x %6lu %6lu\n", 2556 state->dev->ifindex, state->dev->name, 2557 ntohl(state->im->multiaddr), 2558 ntohl(psf->sf_inaddr), 2559 psf->sf_count[MCAST_INCLUDE], 2560 psf->sf_count[MCAST_EXCLUDE]); 2561 } 2562 return 0; 2563} 2564 2565static const struct seq_operations igmp_mcf_seq_ops = { 2566 .start = igmp_mcf_seq_start, 2567 .next = igmp_mcf_seq_next, 2568 .stop = igmp_mcf_seq_stop, 2569 .show = igmp_mcf_seq_show, 2570}; 2571 2572static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2573{ 2574 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2575 sizeof(struct igmp_mcf_iter_state)); 2576} 2577 2578static const struct file_operations igmp_mcf_seq_fops = { 2579 .owner = THIS_MODULE, 2580 .open = igmp_mcf_seq_open, 2581 .read = seq_read, 2582 .llseek = seq_lseek, 2583 .release = seq_release_net, 2584}; 2585 2586static int igmp_net_init(struct net *net) 2587{ 2588 struct proc_dir_entry *pde; 2589 2590 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2591 if (!pde) 2592 goto out_igmp; 2593 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2594 if (!pde) 2595 goto out_mcfilter; 2596 return 0; 2597 2598out_mcfilter: 2599 proc_net_remove(net, "igmp"); 2600out_igmp: 2601 return -ENOMEM; 2602} 2603 2604static void igmp_net_exit(struct net *net) 2605{ 2606 proc_net_remove(net, "mcfilter"); 2607 proc_net_remove(net, "igmp"); 2608} 2609 2610static struct pernet_operations igmp_net_ops = { 2611 .init = igmp_net_init, 2612 .exit = igmp_net_exit, 2613}; 2614 2615int __init igmp_mc_proc_init(void) 2616{ 2617 return register_pernet_subsys(&igmp_net_ops); 2618} 2619#endif 2620 2621EXPORT_SYMBOL(ip_mc_dec_group); 2622EXPORT_SYMBOL(ip_mc_inc_group); 2623EXPORT_SYMBOL(ip_mc_join_group); 2624EXPORT_SYMBOL(ip_mc_rejoin_group); 2625