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 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $ 12 * 13 * Authors: 14 * Alan Cox <Alan.Cox@linux.org> 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License 18 * as published by the Free Software Foundation; either version 19 * 2 of the License, or (at your option) any later version. 20 * 21 * Fixes: 22 * 23 * Alan Cox : Added lots of __inline__ to optimise 24 * the memory usage of all the tiny little 25 * functions. 26 * Alan Cox : Dumped the header building experiment. 27 * Alan Cox : Minor tweaks ready for multicast routing 28 * and extended IGMP protocol. 29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 30 * writes utterly bogus code otherwise (sigh) 31 * fixed IGMP loopback to behave in the manner 32 * desired by mrouted, fixed the fact it has been 33 * broken since 1.3.6 and cleaned up a few minor 34 * points. 35 * 36 * Chih-Jen Chang : Tried to revise IGMP to Version 2 37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 38 * The enhancements are mainly based on Steve Deering's 39 * ipmulti-3.5 source code. 40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 42 * the mrouted version on that device. 43 * Chih-Jen Chang : Added the max_resp_time parameter to 44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 45 * to identify the multicast router version 46 * and do what the IGMP version 2 specified. 47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 48 * Tsu-Sheng Tsao if the specified time expired. 49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 50 * Alan Cox : Use GFP_ATOMIC in the right places. 51 * Christian Daudt : igmp timer wasn't set for local group 52 * memberships but was being deleted, 53 * which caused a "del_timer() called 54 * from %p with timer not initialized\n" 55 * message (960131). 56 * Christian Daudt : removed del_timer from 57 * igmp_timer_expire function (960205). 58 * Christian Daudt : igmp_heard_report now only calls 59 * igmp_timer_expire if tm->running is 60 * true (960216). 61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 62 * igmp_heard_query never trigger. Expiry 63 * miscalculation fixed in igmp_heard_query 64 * and random() made to return unsigned to 65 * prevent negative expiry times. 66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 67 * fix from pending 2.1.x patches. 68 * Alan Cox: Forget to enable FDDI support earlier. 69 * Alexey Kuznetsov: Fixed leaving groups on device down. 70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 71 * David L Stevens: IGMPv3 support, with help from 72 * Vinay Kulkarni 73 */ 74 75 #include <linux/module.h> 76 #include <asm/uaccess.h> 77 #include <asm/system.h> 78 #include <linux/types.h> 79 #include <linux/kernel.h> 80 #include <linux/jiffies.h> 81 #include <linux/string.h> 82 #include <linux/socket.h> 83 #include <linux/sockios.h> 84 #include <linux/in.h> 85 #include <linux/inet.h> 86 #include <linux/netdevice.h> 87 #include <linux/skbuff.h> 88 #include <linux/inetdevice.h> 89 #include <linux/igmp.h> 90 #include <linux/if_arp.h> 91 #include <linux/rtnetlink.h> 92 #include <linux/times.h> 93 94 #include <net/arp.h> 95 #include <net/ip.h> 96 #include <net/protocol.h> 97 #include <net/route.h> 98 #include <net/sock.h> 99 #include <net/checksum.h> 100 #include <linux/netfilter_ipv4.h> 101 #ifdef CONFIG_IP_MROUTE 102 #include <linux/mroute.h> 103 #endif 104 #ifdef CONFIG_PROC_FS 105 #include <linux/proc_fs.h> 106 #include <linux/seq_file.h> 107 #endif 108 109 #define IP_MAX_MEMBERSHIPS 20 110 #define IP_MAX_MSF 10 111 112 #ifdef CONFIG_IP_MULTICAST 113 /* Parameter names and values are taken from igmp-v2-06 draft */ 114 115 #define IGMP_V1_Router_Present_Timeout (400*HZ) 116 #define IGMP_V2_Router_Present_Timeout (400*HZ) 117 #define IGMP_Unsolicited_Report_Interval (10*HZ) 118 #define IGMP_Query_Response_Interval (10*HZ) 119 #define IGMP_Unsolicited_Report_Count 2 120 121 122 #define IGMP_Initial_Report_Delay (1) 123 124 /* IGMP_Initial_Report_Delay is not from IGMP specs! 125 * IGMP specs require to report membership immediately after 126 * joining a group, but we delay the first report by a 127 * small interval. It seems more natural and still does not 128 * contradict to specs provided this delay is small enough. 129 */ 130 131 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \ 132 (in_dev)->cnf.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) (ipv4_devconf.force_igmp_version == 2 || \ 136 (in_dev)->cnf.force_igmp_version == 2 || \ 137 ((in_dev)->mr_v2_seen && \ 138 time_before(jiffies, (in_dev)->mr_v2_seen))) 139 140 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 141 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 142 static void igmpv3_clear_delrec(struct in_device *in_dev); 143 static int sf_setstate(struct ip_mc_list *pmc); 144 static void sf_markstate(struct ip_mc_list *pmc); 145 #endif 146 static void ip_mc_clear_src(struct ip_mc_list *pmc); 147 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 148 int sfcount, __be32 *psfsrc, int delta); 149 150 static void ip_ma_put(struct ip_mc_list *im) 151 { 152 if (atomic_dec_and_test(&im->refcnt)) { 153 in_dev_put(im->interface); 154 kfree(im); 155 } 156 } 157 158 #ifdef CONFIG_IP_MULTICAST 159 160 /* 161 * Timer management 162 */ 163 164 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 165 { 166 spin_lock_bh(&im->lock); 167 if (del_timer(&im->timer)) 168 atomic_dec(&im->refcnt); 169 im->tm_running=0; 170 im->reporter = 0; 171 im->unsolicit_count = 0; 172 spin_unlock_bh(&im->lock); 173 } 174 175 /* It must be called with locked im->lock */ 176 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 177 { 178 int tv=net_random() % max_delay; 179 180 im->tm_running=1; 181 if (!mod_timer(&im->timer, jiffies+tv+2)) 182 atomic_inc(&im->refcnt); 183 } 184 185 static void igmp_gq_start_timer(struct in_device *in_dev) 186 { 187 int tv = net_random() % in_dev->mr_maxdelay; 188 189 in_dev->mr_gq_running = 1; 190 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 191 in_dev_hold(in_dev); 192 } 193 194 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 195 { 196 int tv = net_random() % delay; 197 198 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 199 in_dev_hold(in_dev); 200 } 201 202 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 203 { 204 spin_lock_bh(&im->lock); 205 im->unsolicit_count = 0; 206 if (del_timer(&im->timer)) { 207 if ((long)(im->timer.expires-jiffies) < max_delay) { 208 add_timer(&im->timer); 209 im->tm_running=1; 210 spin_unlock_bh(&im->lock); 211 return; 212 } 213 atomic_dec(&im->refcnt); 214 } 215 igmp_start_timer(im, max_delay); 216 spin_unlock_bh(&im->lock); 217 } 218 219 220 /* 221 * Send an IGMP report. 222 */ 223 224 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 225 226 227 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 228 int gdeleted, int sdeleted) 229 { 230 switch (type) { 231 case IGMPV3_MODE_IS_INCLUDE: 232 case IGMPV3_MODE_IS_EXCLUDE: 233 if (gdeleted || sdeleted) 234 return 0; 235 if (!(pmc->gsquery && !psf->sf_gsresp)) { 236 if (pmc->sfmode == MCAST_INCLUDE) 237 return 1; 238 /* don't include if this source is excluded 239 * in all filters 240 */ 241 if (psf->sf_count[MCAST_INCLUDE]) 242 return type == IGMPV3_MODE_IS_INCLUDE; 243 return pmc->sfcount[MCAST_EXCLUDE] == 244 psf->sf_count[MCAST_EXCLUDE]; 245 } 246 return 0; 247 case IGMPV3_CHANGE_TO_INCLUDE: 248 if (gdeleted || sdeleted) 249 return 0; 250 return psf->sf_count[MCAST_INCLUDE] != 0; 251 case IGMPV3_CHANGE_TO_EXCLUDE: 252 if (gdeleted || sdeleted) 253 return 0; 254 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 255 psf->sf_count[MCAST_INCLUDE]) 256 return 0; 257 return pmc->sfcount[MCAST_EXCLUDE] == 258 psf->sf_count[MCAST_EXCLUDE]; 259 case IGMPV3_ALLOW_NEW_SOURCES: 260 if (gdeleted || !psf->sf_crcount) 261 return 0; 262 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 263 case IGMPV3_BLOCK_OLD_SOURCES: 264 if (pmc->sfmode == MCAST_INCLUDE) 265 return gdeleted || (psf->sf_crcount && sdeleted); 266 return psf->sf_crcount && !gdeleted && !sdeleted; 267 } 268 return 0; 269 } 270 271 static int 272 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 273 { 274 struct ip_sf_list *psf; 275 int scount = 0; 276 277 for (psf=pmc->sources; psf; psf=psf->sf_next) { 278 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 279 continue; 280 scount++; 281 } 282 return scount; 283 } 284 285 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 286 { 287 struct sk_buff *skb; 288 struct rtable *rt; 289 struct iphdr *pip; 290 struct igmpv3_report *pig; 291 292 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); 293 if (skb == NULL) 294 return NULL; 295 296 { 297 struct flowi fl = { .oif = dev->ifindex, 298 .nl_u = { .ip4_u = { 299 .daddr = IGMPV3_ALL_MCR } }, 300 .proto = IPPROTO_IGMP }; 301 if (ip_route_output_key(&rt, &fl)) { 302 kfree_skb(skb); 303 return NULL; 304 } 305 } 306 if (rt->rt_src == 0) { 307 kfree_skb(skb); 308 ip_rt_put(rt); 309 return NULL; 310 } 311 312 skb->dst = &rt->u.dst; 313 skb->dev = dev; 314 315 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 316 317 skb_reset_network_header(skb); 318 pip = ip_hdr(skb); 319 skb_put(skb, sizeof(struct iphdr) + 4); 320 321 pip->version = 4; 322 pip->ihl = (sizeof(struct iphdr)+4)>>2; 323 pip->tos = 0xc0; 324 pip->frag_off = htons(IP_DF); 325 pip->ttl = 1; 326 pip->daddr = rt->rt_dst; 327 pip->saddr = rt->rt_src; 328 pip->protocol = IPPROTO_IGMP; 329 pip->tot_len = 0; /* filled in later */ 330 ip_select_ident(pip, &rt->u.dst, NULL); 331 ((u8*)&pip[1])[0] = IPOPT_RA; 332 ((u8*)&pip[1])[1] = 4; 333 ((u8*)&pip[1])[2] = 0; 334 ((u8*)&pip[1])[3] = 0; 335 336 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 337 skb_put(skb, sizeof(*pig)); 338 pig = igmpv3_report_hdr(skb); 339 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 340 pig->resv1 = 0; 341 pig->csum = 0; 342 pig->resv2 = 0; 343 pig->ngrec = 0; 344 return skb; 345 } 346 347 static int igmpv3_sendpack(struct sk_buff *skb) 348 { 349 struct iphdr *pip = ip_hdr(skb); 350 struct igmphdr *pig = igmp_hdr(skb); 351 const int iplen = skb->tail - skb->network_header; 352 const int igmplen = skb->tail - skb->transport_header; 353 354 pip->tot_len = htons(iplen); 355 ip_send_check(pip); 356 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 357 358 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, 359 dst_output); 360 } 361 362 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 363 { 364 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 365 } 366 367 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 368 int type, struct igmpv3_grec **ppgr) 369 { 370 struct net_device *dev = pmc->interface->dev; 371 struct igmpv3_report *pih; 372 struct igmpv3_grec *pgr; 373 374 if (!skb) 375 skb = igmpv3_newpack(dev, dev->mtu); 376 if (!skb) 377 return NULL; 378 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 379 pgr->grec_type = type; 380 pgr->grec_auxwords = 0; 381 pgr->grec_nsrcs = 0; 382 pgr->grec_mca = pmc->multiaddr; 383 pih = igmpv3_report_hdr(skb); 384 pih->ngrec = htons(ntohs(pih->ngrec)+1); 385 *ppgr = pgr; 386 return skb; 387 } 388 389 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 390 skb_tailroom(skb)) : 0) 391 392 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 393 int type, int gdeleted, int sdeleted) 394 { 395 struct net_device *dev = pmc->interface->dev; 396 struct igmpv3_report *pih; 397 struct igmpv3_grec *pgr = NULL; 398 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 399 int scount, stotal, first, isquery, truncate; 400 401 if (pmc->multiaddr == IGMP_ALL_HOSTS) 402 return skb; 403 404 isquery = type == IGMPV3_MODE_IS_INCLUDE || 405 type == IGMPV3_MODE_IS_EXCLUDE; 406 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 407 type == IGMPV3_CHANGE_TO_EXCLUDE; 408 409 stotal = scount = 0; 410 411 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 412 413 if (!*psf_list) 414 goto empty_source; 415 416 pih = skb ? igmpv3_report_hdr(skb) : NULL; 417 418 /* EX and TO_EX get a fresh packet, if needed */ 419 if (truncate) { 420 if (pih && pih->ngrec && 421 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 422 if (skb) 423 igmpv3_sendpack(skb); 424 skb = igmpv3_newpack(dev, dev->mtu); 425 } 426 } 427 first = 1; 428 psf_prev = NULL; 429 for (psf=*psf_list; psf; psf=psf_next) { 430 __be32 *psrc; 431 432 psf_next = psf->sf_next; 433 434 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 435 psf_prev = psf; 436 continue; 437 } 438 439 /* clear marks on query responses */ 440 if (isquery) 441 psf->sf_gsresp = 0; 442 443 if (AVAILABLE(skb) < sizeof(__be32) + 444 first*sizeof(struct igmpv3_grec)) { 445 if (truncate && !first) 446 break; /* truncate these */ 447 if (pgr) 448 pgr->grec_nsrcs = htons(scount); 449 if (skb) 450 igmpv3_sendpack(skb); 451 skb = igmpv3_newpack(dev, dev->mtu); 452 first = 1; 453 scount = 0; 454 } 455 if (first) { 456 skb = add_grhead(skb, pmc, type, &pgr); 457 first = 0; 458 } 459 if (!skb) 460 return NULL; 461 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 462 *psrc = psf->sf_inaddr; 463 scount++; stotal++; 464 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 465 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 466 psf->sf_crcount--; 467 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 468 if (psf_prev) 469 psf_prev->sf_next = psf->sf_next; 470 else 471 *psf_list = psf->sf_next; 472 kfree(psf); 473 continue; 474 } 475 } 476 psf_prev = psf; 477 } 478 479 empty_source: 480 if (!stotal) { 481 if (type == IGMPV3_ALLOW_NEW_SOURCES || 482 type == IGMPV3_BLOCK_OLD_SOURCES) 483 return skb; 484 if (pmc->crcount || isquery) { 485 /* make sure we have room for group header */ 486 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 487 igmpv3_sendpack(skb); 488 skb = NULL; /* add_grhead will get a new one */ 489 } 490 skb = add_grhead(skb, pmc, type, &pgr); 491 } 492 } 493 if (pgr) 494 pgr->grec_nsrcs = htons(scount); 495 496 if (isquery) 497 pmc->gsquery = 0; /* clear query state on report */ 498 return skb; 499 } 500 501 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 502 { 503 struct sk_buff *skb = NULL; 504 int type; 505 506 if (!pmc) { 507 read_lock(&in_dev->mc_list_lock); 508 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 509 if (pmc->multiaddr == IGMP_ALL_HOSTS) 510 continue; 511 spin_lock_bh(&pmc->lock); 512 if (pmc->sfcount[MCAST_EXCLUDE]) 513 type = IGMPV3_MODE_IS_EXCLUDE; 514 else 515 type = IGMPV3_MODE_IS_INCLUDE; 516 skb = add_grec(skb, pmc, type, 0, 0); 517 spin_unlock_bh(&pmc->lock); 518 } 519 read_unlock(&in_dev->mc_list_lock); 520 } else { 521 spin_lock_bh(&pmc->lock); 522 if (pmc->sfcount[MCAST_EXCLUDE]) 523 type = IGMPV3_MODE_IS_EXCLUDE; 524 else 525 type = IGMPV3_MODE_IS_INCLUDE; 526 skb = add_grec(skb, pmc, type, 0, 0); 527 spin_unlock_bh(&pmc->lock); 528 } 529 if (!skb) 530 return 0; 531 return igmpv3_sendpack(skb); 532 } 533 534 /* 535 * remove zero-count source records from a source filter list 536 */ 537 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 538 { 539 struct ip_sf_list *psf_prev, *psf_next, *psf; 540 541 psf_prev = NULL; 542 for (psf=*ppsf; psf; psf = psf_next) { 543 psf_next = psf->sf_next; 544 if (psf->sf_crcount == 0) { 545 if (psf_prev) 546 psf_prev->sf_next = psf->sf_next; 547 else 548 *ppsf = psf->sf_next; 549 kfree(psf); 550 } else 551 psf_prev = psf; 552 } 553 } 554 555 static void igmpv3_send_cr(struct in_device *in_dev) 556 { 557 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 558 struct sk_buff *skb = NULL; 559 int type, dtype; 560 561 read_lock(&in_dev->mc_list_lock); 562 spin_lock_bh(&in_dev->mc_tomb_lock); 563 564 /* deleted MCA's */ 565 pmc_prev = NULL; 566 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 567 pmc_next = pmc->next; 568 if (pmc->sfmode == MCAST_INCLUDE) { 569 type = IGMPV3_BLOCK_OLD_SOURCES; 570 dtype = IGMPV3_BLOCK_OLD_SOURCES; 571 skb = add_grec(skb, pmc, type, 1, 0); 572 skb = add_grec(skb, pmc, dtype, 1, 1); 573 } 574 if (pmc->crcount) { 575 if (pmc->sfmode == MCAST_EXCLUDE) { 576 type = IGMPV3_CHANGE_TO_INCLUDE; 577 skb = add_grec(skb, pmc, type, 1, 0); 578 } 579 pmc->crcount--; 580 if (pmc->crcount == 0) { 581 igmpv3_clear_zeros(&pmc->tomb); 582 igmpv3_clear_zeros(&pmc->sources); 583 } 584 } 585 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 586 if (pmc_prev) 587 pmc_prev->next = pmc_next; 588 else 589 in_dev->mc_tomb = pmc_next; 590 in_dev_put(pmc->interface); 591 kfree(pmc); 592 } else 593 pmc_prev = pmc; 594 } 595 spin_unlock_bh(&in_dev->mc_tomb_lock); 596 597 /* change recs */ 598 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 599 spin_lock_bh(&pmc->lock); 600 if (pmc->sfcount[MCAST_EXCLUDE]) { 601 type = IGMPV3_BLOCK_OLD_SOURCES; 602 dtype = IGMPV3_ALLOW_NEW_SOURCES; 603 } else { 604 type = IGMPV3_ALLOW_NEW_SOURCES; 605 dtype = IGMPV3_BLOCK_OLD_SOURCES; 606 } 607 skb = add_grec(skb, pmc, type, 0, 0); 608 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 609 610 /* filter mode changes */ 611 if (pmc->crcount) { 612 if (pmc->sfmode == MCAST_EXCLUDE) 613 type = IGMPV3_CHANGE_TO_EXCLUDE; 614 else 615 type = IGMPV3_CHANGE_TO_INCLUDE; 616 skb = add_grec(skb, pmc, type, 0, 0); 617 pmc->crcount--; 618 } 619 spin_unlock_bh(&pmc->lock); 620 } 621 read_unlock(&in_dev->mc_list_lock); 622 623 if (!skb) 624 return; 625 (void) igmpv3_sendpack(skb); 626 } 627 628 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 629 int type) 630 { 631 struct sk_buff *skb; 632 struct iphdr *iph; 633 struct igmphdr *ih; 634 struct rtable *rt; 635 struct net_device *dev = in_dev->dev; 636 __be32 group = pmc ? pmc->multiaddr : 0; 637 __be32 dst; 638 639 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 640 return igmpv3_send_report(in_dev, pmc); 641 else if (type == IGMP_HOST_LEAVE_MESSAGE) 642 dst = IGMP_ALL_ROUTER; 643 else 644 dst = group; 645 646 { 647 struct flowi fl = { .oif = dev->ifindex, 648 .nl_u = { .ip4_u = { .daddr = dst } }, 649 .proto = IPPROTO_IGMP }; 650 if (ip_route_output_key(&rt, &fl)) 651 return -1; 652 } 653 if (rt->rt_src == 0) { 654 ip_rt_put(rt); 655 return -1; 656 } 657 658 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 659 if (skb == NULL) { 660 ip_rt_put(rt); 661 return -1; 662 } 663 664 skb->dst = &rt->u.dst; 665 666 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 667 668 skb_reset_network_header(skb); 669 iph = ip_hdr(skb); 670 skb_put(skb, sizeof(struct iphdr) + 4); 671 672 iph->version = 4; 673 iph->ihl = (sizeof(struct iphdr)+4)>>2; 674 iph->tos = 0xc0; 675 iph->frag_off = htons(IP_DF); 676 iph->ttl = 1; 677 iph->daddr = dst; 678 iph->saddr = rt->rt_src; 679 iph->protocol = IPPROTO_IGMP; 680 iph->tot_len = htons(IGMP_SIZE); 681 ip_select_ident(iph, &rt->u.dst, NULL); 682 ((u8*)&iph[1])[0] = IPOPT_RA; 683 ((u8*)&iph[1])[1] = 4; 684 ((u8*)&iph[1])[2] = 0; 685 ((u8*)&iph[1])[3] = 0; 686 ip_send_check(iph); 687 688 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 689 ih->type=type; 690 ih->code=0; 691 ih->csum=0; 692 ih->group=group; 693 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 694 695 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 696 dst_output); 697 } 698 699 static void igmp_gq_timer_expire(unsigned long data) 700 { 701 struct in_device *in_dev = (struct in_device *)data; 702 703 in_dev->mr_gq_running = 0; 704 igmpv3_send_report(in_dev, NULL); 705 __in_dev_put(in_dev); 706 } 707 708 static void igmp_ifc_timer_expire(unsigned long data) 709 { 710 struct in_device *in_dev = (struct in_device *)data; 711 712 igmpv3_send_cr(in_dev); 713 if (in_dev->mr_ifc_count) { 714 in_dev->mr_ifc_count--; 715 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 716 } 717 __in_dev_put(in_dev); 718 } 719 720 static void igmp_ifc_event(struct in_device *in_dev) 721 { 722 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 723 return; 724 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 725 IGMP_Unsolicited_Report_Count; 726 igmp_ifc_start_timer(in_dev, 1); 727 } 728 729 730 static void igmp_timer_expire(unsigned long data) 731 { 732 struct ip_mc_list *im=(struct ip_mc_list *)data; 733 struct in_device *in_dev = im->interface; 734 735 spin_lock(&im->lock); 736 im->tm_running=0; 737 738 if (im->unsolicit_count) { 739 im->unsolicit_count--; 740 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 741 } 742 im->reporter = 1; 743 spin_unlock(&im->lock); 744 745 if (IGMP_V1_SEEN(in_dev)) 746 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 747 else if (IGMP_V2_SEEN(in_dev)) 748 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 749 else 750 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 751 752 ip_ma_put(im); 753 } 754 755 /* mark EXCLUDE-mode sources */ 756 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 757 { 758 struct ip_sf_list *psf; 759 int i, scount; 760 761 scount = 0; 762 for (psf=pmc->sources; psf; psf=psf->sf_next) { 763 if (scount == nsrcs) 764 break; 765 for (i=0; i<nsrcs; i++) { 766 /* skip inactive filters */ 767 if (pmc->sfcount[MCAST_INCLUDE] || 768 pmc->sfcount[MCAST_EXCLUDE] != 769 psf->sf_count[MCAST_EXCLUDE]) 770 continue; 771 if (srcs[i] == psf->sf_inaddr) { 772 scount++; 773 break; 774 } 775 } 776 } 777 pmc->gsquery = 0; 778 if (scount == nsrcs) /* all sources excluded */ 779 return 0; 780 return 1; 781 } 782 783 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 784 { 785 struct ip_sf_list *psf; 786 int i, scount; 787 788 if (pmc->sfmode == MCAST_EXCLUDE) 789 return igmp_xmarksources(pmc, nsrcs, srcs); 790 791 /* mark INCLUDE-mode sources */ 792 scount = 0; 793 for (psf=pmc->sources; psf; psf=psf->sf_next) { 794 if (scount == nsrcs) 795 break; 796 for (i=0; i<nsrcs; i++) 797 if (srcs[i] == psf->sf_inaddr) { 798 psf->sf_gsresp = 1; 799 scount++; 800 break; 801 } 802 } 803 if (!scount) { 804 pmc->gsquery = 0; 805 return 0; 806 } 807 pmc->gsquery = 1; 808 return 1; 809 } 810 811 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 812 { 813 struct ip_mc_list *im; 814 815 /* Timers are only set for non-local groups */ 816 817 if (group == IGMP_ALL_HOSTS) 818 return; 819 820 read_lock(&in_dev->mc_list_lock); 821 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 822 if (im->multiaddr == group) { 823 igmp_stop_timer(im); 824 break; 825 } 826 } 827 read_unlock(&in_dev->mc_list_lock); 828 } 829 830 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 831 int len) 832 { 833 struct igmphdr *ih = igmp_hdr(skb); 834 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 835 struct ip_mc_list *im; 836 __be32 group = ih->group; 837 int max_delay; 838 int mark = 0; 839 840 841 if (len == 8) { 842 if (ih->code == 0) { 843 /* Alas, old v1 router presents here. */ 844 845 max_delay = IGMP_Query_Response_Interval; 846 in_dev->mr_v1_seen = jiffies + 847 IGMP_V1_Router_Present_Timeout; 848 group = 0; 849 } else { 850 /* v2 router present */ 851 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 852 in_dev->mr_v2_seen = jiffies + 853 IGMP_V2_Router_Present_Timeout; 854 } 855 /* cancel the interface change timer */ 856 in_dev->mr_ifc_count = 0; 857 if (del_timer(&in_dev->mr_ifc_timer)) 858 __in_dev_put(in_dev); 859 /* clear deleted report items */ 860 igmpv3_clear_delrec(in_dev); 861 } else if (len < 12) { 862 return; /* ignore bogus packet; freed by caller */ 863 } else { /* v3 */ 864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 865 return; 866 867 ih3 = igmpv3_query_hdr(skb); 868 if (ih3->nsrcs) { 869 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 870 + ntohs(ih3->nsrcs)*sizeof(__be32))) 871 return; 872 ih3 = igmpv3_query_hdr(skb); 873 } 874 875 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 876 if (!max_delay) 877 max_delay = 1; /* can't mod w/ 0 */ 878 in_dev->mr_maxdelay = max_delay; 879 if (ih3->qrv) 880 in_dev->mr_qrv = ih3->qrv; 881 if (!group) { /* general query */ 882 if (ih3->nsrcs) 883 return; /* no sources allowed */ 884 igmp_gq_start_timer(in_dev); 885 return; 886 } 887 /* mark sources to include, if group & source-specific */ 888 mark = ih3->nsrcs != 0; 889 } 890 891 /* 892 * - Start the timers in all of our membership records 893 * that the query applies to for the interface on 894 * which the query arrived excl. those that belong 895 * to a "local" group (224.0.0.X) 896 * - For timers already running check if they need to 897 * be reset. 898 * - Use the igmp->igmp_code field as the maximum 899 * delay possible 900 */ 901 read_lock(&in_dev->mc_list_lock); 902 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 903 int changed; 904 905 if (group && group != im->multiaddr) 906 continue; 907 if (im->multiaddr == IGMP_ALL_HOSTS) 908 continue; 909 spin_lock_bh(&im->lock); 910 if (im->tm_running) 911 im->gsquery = im->gsquery && mark; 912 else 913 im->gsquery = mark; 914 changed = !im->gsquery || 915 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 916 spin_unlock_bh(&im->lock); 917 if (changed) 918 igmp_mod_timer(im, max_delay); 919 } 920 read_unlock(&in_dev->mc_list_lock); 921 } 922 923 int igmp_rcv(struct sk_buff *skb) 924 { 925 /* This basically follows the spec line by line -- see RFC1112 */ 926 struct igmphdr *ih; 927 struct in_device *in_dev = in_dev_get(skb->dev); 928 int len = skb->len; 929 930 if (in_dev==NULL) { 931 kfree_skb(skb); 932 return 0; 933 } 934 935 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 936 goto drop; 937 938 switch (skb->ip_summed) { 939 case CHECKSUM_COMPLETE: 940 if (!csum_fold(skb->csum)) 941 break; 942 /* fall through */ 943 case CHECKSUM_NONE: 944 skb->csum = 0; 945 if (__skb_checksum_complete(skb)) 946 goto drop; 947 } 948 949 ih = igmp_hdr(skb); 950 switch (ih->type) { 951 case IGMP_HOST_MEMBERSHIP_QUERY: 952 igmp_heard_query(in_dev, skb, len); 953 break; 954 case IGMP_HOST_MEMBERSHIP_REPORT: 955 case IGMPV2_HOST_MEMBERSHIP_REPORT: 956 case IGMPV3_HOST_MEMBERSHIP_REPORT: 957 /* Is it our report looped back? */ 958 if (((struct rtable*)skb->dst)->fl.iif == 0) 959 break; 960 /* don't rely on MC router hearing unicast reports */ 961 if (skb->pkt_type == PACKET_MULTICAST || 962 skb->pkt_type == PACKET_BROADCAST) 963 igmp_heard_report(in_dev, ih->group); 964 break; 965 case IGMP_PIM: 966 #ifdef CONFIG_IP_PIMSM_V1 967 in_dev_put(in_dev); 968 return pim_rcv_v1(skb); 969 #endif 970 case IGMP_DVMRP: 971 case IGMP_TRACE: 972 case IGMP_HOST_LEAVE_MESSAGE: 973 case IGMP_MTRACE: 974 case IGMP_MTRACE_RESP: 975 break; 976 default: 977 break; 978 } 979 980 drop: 981 in_dev_put(in_dev); 982 kfree_skb(skb); 983 return 0; 984 } 985 986 #endif 987 988 989 /* 990 * Add a filter to a device 991 */ 992 993 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 994 { 995 char buf[MAX_ADDR_LEN]; 996 struct net_device *dev = in_dev->dev; 997 998 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 999 We will get multicast token leakage, when IFF_MULTICAST 1000 is changed. This check should be done in dev->set_multicast_list 1001 routine. Something sort of: 1002 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1003 --ANK 1004 */ 1005 if (arp_mc_map(addr, buf, dev, 0) == 0) 1006 dev_mc_add(dev,buf,dev->addr_len,0); 1007 } 1008 1009 /* 1010 * Remove a filter from a device 1011 */ 1012 1013 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1014 { 1015 char buf[MAX_ADDR_LEN]; 1016 struct net_device *dev = in_dev->dev; 1017 1018 if (arp_mc_map(addr, buf, dev, 0) == 0) 1019 dev_mc_delete(dev,buf,dev->addr_len,0); 1020 } 1021 1022 #ifdef CONFIG_IP_MULTICAST 1023 /* 1024 * deleted ip_mc_list manipulation 1025 */ 1026 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1027 { 1028 struct ip_mc_list *pmc; 1029 1030 /* this is an "ip_mc_list" for convenience; only the fields below 1031 * are actually used. In particular, the refcnt and users are not 1032 * used for management of the delete list. Using the same structure 1033 * for deleted items allows change reports to use common code with 1034 * non-deleted or query-response MCA's. 1035 */ 1036 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1037 if (!pmc) 1038 return; 1039 spin_lock_bh(&im->lock); 1040 pmc->interface = im->interface; 1041 in_dev_hold(in_dev); 1042 pmc->multiaddr = im->multiaddr; 1043 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1044 IGMP_Unsolicited_Report_Count; 1045 pmc->sfmode = im->sfmode; 1046 if (pmc->sfmode == MCAST_INCLUDE) { 1047 struct ip_sf_list *psf; 1048 1049 pmc->tomb = im->tomb; 1050 pmc->sources = im->sources; 1051 im->tomb = im->sources = NULL; 1052 for (psf=pmc->sources; psf; psf=psf->sf_next) 1053 psf->sf_crcount = pmc->crcount; 1054 } 1055 spin_unlock_bh(&im->lock); 1056 1057 spin_lock_bh(&in_dev->mc_tomb_lock); 1058 pmc->next = in_dev->mc_tomb; 1059 in_dev->mc_tomb = pmc; 1060 spin_unlock_bh(&in_dev->mc_tomb_lock); 1061 } 1062 1063 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1064 { 1065 struct ip_mc_list *pmc, *pmc_prev; 1066 struct ip_sf_list *psf, *psf_next; 1067 1068 spin_lock_bh(&in_dev->mc_tomb_lock); 1069 pmc_prev = NULL; 1070 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1071 if (pmc->multiaddr == multiaddr) 1072 break; 1073 pmc_prev = pmc; 1074 } 1075 if (pmc) { 1076 if (pmc_prev) 1077 pmc_prev->next = pmc->next; 1078 else 1079 in_dev->mc_tomb = pmc->next; 1080 } 1081 spin_unlock_bh(&in_dev->mc_tomb_lock); 1082 if (pmc) { 1083 for (psf=pmc->tomb; psf; psf=psf_next) { 1084 psf_next = psf->sf_next; 1085 kfree(psf); 1086 } 1087 in_dev_put(pmc->interface); 1088 kfree(pmc); 1089 } 1090 } 1091 1092 static void igmpv3_clear_delrec(struct in_device *in_dev) 1093 { 1094 struct ip_mc_list *pmc, *nextpmc; 1095 1096 spin_lock_bh(&in_dev->mc_tomb_lock); 1097 pmc = in_dev->mc_tomb; 1098 in_dev->mc_tomb = NULL; 1099 spin_unlock_bh(&in_dev->mc_tomb_lock); 1100 1101 for (; pmc; pmc = nextpmc) { 1102 nextpmc = pmc->next; 1103 ip_mc_clear_src(pmc); 1104 in_dev_put(pmc->interface); 1105 kfree(pmc); 1106 } 1107 /* clear dead sources, too */ 1108 read_lock(&in_dev->mc_list_lock); 1109 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1110 struct ip_sf_list *psf, *psf_next; 1111 1112 spin_lock_bh(&pmc->lock); 1113 psf = pmc->tomb; 1114 pmc->tomb = NULL; 1115 spin_unlock_bh(&pmc->lock); 1116 for (; psf; psf=psf_next) { 1117 psf_next = psf->sf_next; 1118 kfree(psf); 1119 } 1120 } 1121 read_unlock(&in_dev->mc_list_lock); 1122 } 1123 #endif 1124 1125 static void igmp_group_dropped(struct ip_mc_list *im) 1126 { 1127 struct in_device *in_dev = im->interface; 1128 #ifdef CONFIG_IP_MULTICAST 1129 int reporter; 1130 #endif 1131 1132 if (im->loaded) { 1133 im->loaded = 0; 1134 ip_mc_filter_del(in_dev, im->multiaddr); 1135 } 1136 1137 #ifdef CONFIG_IP_MULTICAST 1138 if (im->multiaddr == IGMP_ALL_HOSTS) 1139 return; 1140 1141 reporter = im->reporter; 1142 igmp_stop_timer(im); 1143 1144 if (!in_dev->dead) { 1145 if (IGMP_V1_SEEN(in_dev)) 1146 goto done; 1147 if (IGMP_V2_SEEN(in_dev)) { 1148 if (reporter) 1149 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1150 goto done; 1151 } 1152 /* IGMPv3 */ 1153 igmpv3_add_delrec(in_dev, im); 1154 1155 igmp_ifc_event(in_dev); 1156 } 1157 done: 1158 #endif 1159 ip_mc_clear_src(im); 1160 } 1161 1162 static void igmp_group_added(struct ip_mc_list *im) 1163 { 1164 struct in_device *in_dev = im->interface; 1165 1166 if (im->loaded == 0) { 1167 im->loaded = 1; 1168 ip_mc_filter_add(in_dev, im->multiaddr); 1169 } 1170 1171 #ifdef CONFIG_IP_MULTICAST 1172 if (im->multiaddr == IGMP_ALL_HOSTS) 1173 return; 1174 1175 if (in_dev->dead) 1176 return; 1177 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1178 spin_lock_bh(&im->lock); 1179 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1180 spin_unlock_bh(&im->lock); 1181 return; 1182 } 1183 /* else, v3 */ 1184 1185 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1186 IGMP_Unsolicited_Report_Count; 1187 igmp_ifc_event(in_dev); 1188 #endif 1189 } 1190 1191 1192 /* 1193 * Multicast list managers 1194 */ 1195 1196 1197 /* 1198 * A socket has joined a multicast group on device dev. 1199 */ 1200 1201 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1202 { 1203 struct ip_mc_list *im; 1204 1205 ASSERT_RTNL(); 1206 1207 for (im=in_dev->mc_list; im; im=im->next) { 1208 if (im->multiaddr == addr) { 1209 im->users++; 1210 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1211 goto out; 1212 } 1213 } 1214 1215 im = kmalloc(sizeof(*im), GFP_KERNEL); 1216 if (!im) 1217 goto out; 1218 1219 im->users=1; 1220 im->interface=in_dev; 1221 in_dev_hold(in_dev); 1222 im->multiaddr=addr; 1223 /* initial mode is (EX, empty) */ 1224 im->sfmode = MCAST_EXCLUDE; 1225 im->sfcount[MCAST_INCLUDE] = 0; 1226 im->sfcount[MCAST_EXCLUDE] = 1; 1227 im->sources = NULL; 1228 im->tomb = NULL; 1229 im->crcount = 0; 1230 atomic_set(&im->refcnt, 1); 1231 spin_lock_init(&im->lock); 1232 #ifdef CONFIG_IP_MULTICAST 1233 im->tm_running=0; 1234 init_timer(&im->timer); 1235 im->timer.data=(unsigned long)im; 1236 im->timer.function=&igmp_timer_expire; 1237 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1238 im->reporter = 0; 1239 im->gsquery = 0; 1240 #endif 1241 im->loaded = 0; 1242 write_lock_bh(&in_dev->mc_list_lock); 1243 im->next=in_dev->mc_list; 1244 in_dev->mc_list=im; 1245 write_unlock_bh(&in_dev->mc_list_lock); 1246 #ifdef CONFIG_IP_MULTICAST 1247 igmpv3_del_delrec(in_dev, im->multiaddr); 1248 #endif 1249 igmp_group_added(im); 1250 if (!in_dev->dead) 1251 ip_rt_multicast_event(in_dev); 1252 out: 1253 return; 1254 } 1255 1256 /* 1257 * Resend IGMP JOIN report; used for bonding. 1258 */ 1259 void ip_mc_rejoin_group(struct ip_mc_list *im) 1260 { 1261 #ifdef CONFIG_IP_MULTICAST 1262 struct in_device *in_dev = im->interface; 1263 1264 if (im->multiaddr == IGMP_ALL_HOSTS) 1265 return; 1266 1267 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1268 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1269 return; 1270 } 1271 /* else, v3 */ 1272 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1273 IGMP_Unsolicited_Report_Count; 1274 igmp_ifc_event(in_dev); 1275 #endif 1276 } 1277 1278 /* 1279 * A socket has left a multicast group on device dev 1280 */ 1281 1282 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1283 { 1284 struct ip_mc_list *i, **ip; 1285 1286 ASSERT_RTNL(); 1287 1288 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1289 if (i->multiaddr==addr) { 1290 if (--i->users == 0) { 1291 write_lock_bh(&in_dev->mc_list_lock); 1292 *ip = i->next; 1293 write_unlock_bh(&in_dev->mc_list_lock); 1294 igmp_group_dropped(i); 1295 1296 if (!in_dev->dead) 1297 ip_rt_multicast_event(in_dev); 1298 1299 ip_ma_put(i); 1300 return; 1301 } 1302 break; 1303 } 1304 } 1305 } 1306 1307 /* Device going down */ 1308 1309 void ip_mc_down(struct in_device *in_dev) 1310 { 1311 struct ip_mc_list *i; 1312 1313 ASSERT_RTNL(); 1314 1315 for (i=in_dev->mc_list; i; i=i->next) 1316 igmp_group_dropped(i); 1317 1318 #ifdef CONFIG_IP_MULTICAST 1319 in_dev->mr_ifc_count = 0; 1320 if (del_timer(&in_dev->mr_ifc_timer)) 1321 __in_dev_put(in_dev); 1322 in_dev->mr_gq_running = 0; 1323 if (del_timer(&in_dev->mr_gq_timer)) 1324 __in_dev_put(in_dev); 1325 igmpv3_clear_delrec(in_dev); 1326 #endif 1327 1328 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1329 } 1330 1331 void ip_mc_init_dev(struct in_device *in_dev) 1332 { 1333 ASSERT_RTNL(); 1334 1335 in_dev->mc_tomb = NULL; 1336 #ifdef CONFIG_IP_MULTICAST 1337 in_dev->mr_gq_running = 0; 1338 init_timer(&in_dev->mr_gq_timer); 1339 in_dev->mr_gq_timer.data=(unsigned long) in_dev; 1340 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; 1341 in_dev->mr_ifc_count = 0; 1342 init_timer(&in_dev->mr_ifc_timer); 1343 in_dev->mr_ifc_timer.data=(unsigned long) in_dev; 1344 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; 1345 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1346 #endif 1347 1348 rwlock_init(&in_dev->mc_list_lock); 1349 spin_lock_init(&in_dev->mc_tomb_lock); 1350 } 1351 1352 /* Device going up */ 1353 1354 void ip_mc_up(struct in_device *in_dev) 1355 { 1356 struct ip_mc_list *i; 1357 1358 ASSERT_RTNL(); 1359 1360 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1361 1362 for (i=in_dev->mc_list; i; i=i->next) 1363 igmp_group_added(i); 1364 } 1365 1366 /* 1367 * Device is about to be destroyed: clean up. 1368 */ 1369 1370 void ip_mc_destroy_dev(struct in_device *in_dev) 1371 { 1372 struct ip_mc_list *i; 1373 1374 ASSERT_RTNL(); 1375 1376 /* Deactivate timers */ 1377 ip_mc_down(in_dev); 1378 1379 write_lock_bh(&in_dev->mc_list_lock); 1380 while ((i = in_dev->mc_list) != NULL) { 1381 in_dev->mc_list = i->next; 1382 write_unlock_bh(&in_dev->mc_list_lock); 1383 1384 igmp_group_dropped(i); 1385 ip_ma_put(i); 1386 1387 write_lock_bh(&in_dev->mc_list_lock); 1388 } 1389 write_unlock_bh(&in_dev->mc_list_lock); 1390 } 1391 1392 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1393 { 1394 struct flowi fl = { .nl_u = { .ip4_u = 1395 { .daddr = imr->imr_multiaddr.s_addr } } }; 1396 struct rtable *rt; 1397 struct net_device *dev = NULL; 1398 struct in_device *idev = NULL; 1399 1400 if (imr->imr_ifindex) { 1401 idev = inetdev_by_index(imr->imr_ifindex); 1402 if (idev) 1403 __in_dev_put(idev); 1404 return idev; 1405 } 1406 if (imr->imr_address.s_addr) { 1407 dev = ip_dev_find(imr->imr_address.s_addr); 1408 if (!dev) 1409 return NULL; 1410 dev_put(dev); 1411 } 1412 1413 if (!dev && !ip_route_output_key(&rt, &fl)) { 1414 dev = rt->u.dst.dev; 1415 ip_rt_put(rt); 1416 } 1417 if (dev) { 1418 imr->imr_ifindex = dev->ifindex; 1419 idev = __in_dev_get_rtnl(dev); 1420 } 1421 return idev; 1422 } 1423 1424 /* 1425 * Join a socket to a group 1426 */ 1427 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1428 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1429 1430 1431 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1432 __be32 *psfsrc) 1433 { 1434 struct ip_sf_list *psf, *psf_prev; 1435 int rv = 0; 1436 1437 psf_prev = NULL; 1438 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1439 if (psf->sf_inaddr == *psfsrc) 1440 break; 1441 psf_prev = psf; 1442 } 1443 if (!psf || psf->sf_count[sfmode] == 0) { 1444 /* source filter not found, or count wrong => bug */ 1445 return -ESRCH; 1446 } 1447 psf->sf_count[sfmode]--; 1448 if (psf->sf_count[sfmode] == 0) { 1449 ip_rt_multicast_event(pmc->interface); 1450 } 1451 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1452 #ifdef CONFIG_IP_MULTICAST 1453 struct in_device *in_dev = pmc->interface; 1454 #endif 1455 1456 /* no more filters for this source */ 1457 if (psf_prev) 1458 psf_prev->sf_next = psf->sf_next; 1459 else 1460 pmc->sources = psf->sf_next; 1461 #ifdef CONFIG_IP_MULTICAST 1462 if (psf->sf_oldin && 1463 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1464 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1465 IGMP_Unsolicited_Report_Count; 1466 psf->sf_next = pmc->tomb; 1467 pmc->tomb = psf; 1468 rv = 1; 1469 } else 1470 #endif 1471 kfree(psf); 1472 } 1473 return rv; 1474 } 1475 1476 #ifndef CONFIG_IP_MULTICAST 1477 #define igmp_ifc_event(x) do { } while (0) 1478 #endif 1479 1480 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1481 int sfcount, __be32 *psfsrc, int delta) 1482 { 1483 struct ip_mc_list *pmc; 1484 int changerec = 0; 1485 int i, err; 1486 1487 if (!in_dev) 1488 return -ENODEV; 1489 read_lock(&in_dev->mc_list_lock); 1490 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1491 if (*pmca == pmc->multiaddr) 1492 break; 1493 } 1494 if (!pmc) { 1495 /* MCA not found?? bug */ 1496 read_unlock(&in_dev->mc_list_lock); 1497 return -ESRCH; 1498 } 1499 spin_lock_bh(&pmc->lock); 1500 read_unlock(&in_dev->mc_list_lock); 1501 #ifdef CONFIG_IP_MULTICAST 1502 sf_markstate(pmc); 1503 #endif 1504 if (!delta) { 1505 err = -EINVAL; 1506 if (!pmc->sfcount[sfmode]) 1507 goto out_unlock; 1508 pmc->sfcount[sfmode]--; 1509 } 1510 err = 0; 1511 for (i=0; i<sfcount; i++) { 1512 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1513 1514 changerec |= rv > 0; 1515 if (!err && rv < 0) 1516 err = rv; 1517 } 1518 if (pmc->sfmode == MCAST_EXCLUDE && 1519 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1520 pmc->sfcount[MCAST_INCLUDE]) { 1521 #ifdef CONFIG_IP_MULTICAST 1522 struct ip_sf_list *psf; 1523 #endif 1524 1525 /* filter mode change */ 1526 pmc->sfmode = MCAST_INCLUDE; 1527 #ifdef CONFIG_IP_MULTICAST 1528 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1529 IGMP_Unsolicited_Report_Count; 1530 in_dev->mr_ifc_count = pmc->crcount; 1531 for (psf=pmc->sources; psf; psf = psf->sf_next) 1532 psf->sf_crcount = 0; 1533 igmp_ifc_event(pmc->interface); 1534 } else if (sf_setstate(pmc) || changerec) { 1535 igmp_ifc_event(pmc->interface); 1536 #endif 1537 } 1538 out_unlock: 1539 spin_unlock_bh(&pmc->lock); 1540 return err; 1541 } 1542 1543 /* 1544 * Add multicast single-source filter to the interface list 1545 */ 1546 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1547 __be32 *psfsrc, int delta) 1548 { 1549 struct ip_sf_list *psf, *psf_prev; 1550 1551 psf_prev = NULL; 1552 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1553 if (psf->sf_inaddr == *psfsrc) 1554 break; 1555 psf_prev = psf; 1556 } 1557 if (!psf) { 1558 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1559 if (!psf) 1560 return -ENOBUFS; 1561 psf->sf_inaddr = *psfsrc; 1562 if (psf_prev) { 1563 psf_prev->sf_next = psf; 1564 } else 1565 pmc->sources = psf; 1566 } 1567 psf->sf_count[sfmode]++; 1568 if (psf->sf_count[sfmode] == 1) { 1569 ip_rt_multicast_event(pmc->interface); 1570 } 1571 return 0; 1572 } 1573 1574 #ifdef CONFIG_IP_MULTICAST 1575 static void sf_markstate(struct ip_mc_list *pmc) 1576 { 1577 struct ip_sf_list *psf; 1578 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1579 1580 for (psf=pmc->sources; psf; psf=psf->sf_next) 1581 if (pmc->sfcount[MCAST_EXCLUDE]) { 1582 psf->sf_oldin = mca_xcount == 1583 psf->sf_count[MCAST_EXCLUDE] && 1584 !psf->sf_count[MCAST_INCLUDE]; 1585 } else 1586 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1587 } 1588 1589 static int sf_setstate(struct ip_mc_list *pmc) 1590 { 1591 struct ip_sf_list *psf, *dpsf; 1592 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1593 int qrv = pmc->interface->mr_qrv; 1594 int new_in, rv; 1595 1596 rv = 0; 1597 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1598 if (pmc->sfcount[MCAST_EXCLUDE]) { 1599 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1600 !psf->sf_count[MCAST_INCLUDE]; 1601 } else 1602 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1603 if (new_in) { 1604 if (!psf->sf_oldin) { 1605 struct ip_sf_list *prev = NULL; 1606 1607 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1608 if (dpsf->sf_inaddr == psf->sf_inaddr) 1609 break; 1610 prev = dpsf; 1611 } 1612 if (dpsf) { 1613 if (prev) 1614 prev->sf_next = dpsf->sf_next; 1615 else 1616 pmc->tomb = dpsf->sf_next; 1617 kfree(dpsf); 1618 } 1619 psf->sf_crcount = qrv; 1620 rv++; 1621 } 1622 } else if (psf->sf_oldin) { 1623 1624 psf->sf_crcount = 0; 1625 /* 1626 * add or update "delete" records if an active filter 1627 * is now inactive 1628 */ 1629 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1630 if (dpsf->sf_inaddr == psf->sf_inaddr) 1631 break; 1632 if (!dpsf) { 1633 dpsf = (struct ip_sf_list *) 1634 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1635 if (!dpsf) 1636 continue; 1637 *dpsf = *psf; 1638 /* pmc->lock held by callers */ 1639 dpsf->sf_next = pmc->tomb; 1640 pmc->tomb = dpsf; 1641 } 1642 dpsf->sf_crcount = qrv; 1643 rv++; 1644 } 1645 } 1646 return rv; 1647 } 1648 #endif 1649 1650 /* 1651 * Add multicast source filter list to the interface list 1652 */ 1653 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1654 int sfcount, __be32 *psfsrc, int delta) 1655 { 1656 struct ip_mc_list *pmc; 1657 int isexclude; 1658 int i, err; 1659 1660 if (!in_dev) 1661 return -ENODEV; 1662 read_lock(&in_dev->mc_list_lock); 1663 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1664 if (*pmca == pmc->multiaddr) 1665 break; 1666 } 1667 if (!pmc) { 1668 /* MCA not found?? bug */ 1669 read_unlock(&in_dev->mc_list_lock); 1670 return -ESRCH; 1671 } 1672 spin_lock_bh(&pmc->lock); 1673 read_unlock(&in_dev->mc_list_lock); 1674 1675 #ifdef CONFIG_IP_MULTICAST 1676 sf_markstate(pmc); 1677 #endif 1678 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1679 if (!delta) 1680 pmc->sfcount[sfmode]++; 1681 err = 0; 1682 for (i=0; i<sfcount; i++) { 1683 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1684 if (err) 1685 break; 1686 } 1687 if (err) { 1688 int j; 1689 1690 pmc->sfcount[sfmode]--; 1691 for (j=0; j<i; j++) 1692 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1693 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1694 #ifdef CONFIG_IP_MULTICAST 1695 struct in_device *in_dev = pmc->interface; 1696 struct ip_sf_list *psf; 1697 #endif 1698 1699 /* filter mode change */ 1700 if (pmc->sfcount[MCAST_EXCLUDE]) 1701 pmc->sfmode = MCAST_EXCLUDE; 1702 else if (pmc->sfcount[MCAST_INCLUDE]) 1703 pmc->sfmode = MCAST_INCLUDE; 1704 #ifdef CONFIG_IP_MULTICAST 1705 /* else no filters; keep old mode for reports */ 1706 1707 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1708 IGMP_Unsolicited_Report_Count; 1709 in_dev->mr_ifc_count = pmc->crcount; 1710 for (psf=pmc->sources; psf; psf = psf->sf_next) 1711 psf->sf_crcount = 0; 1712 igmp_ifc_event(in_dev); 1713 } else if (sf_setstate(pmc)) { 1714 igmp_ifc_event(in_dev); 1715 #endif 1716 } 1717 spin_unlock_bh(&pmc->lock); 1718 return err; 1719 } 1720 1721 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1722 { 1723 struct ip_sf_list *psf, *nextpsf; 1724 1725 for (psf=pmc->tomb; psf; psf=nextpsf) { 1726 nextpsf = psf->sf_next; 1727 kfree(psf); 1728 } 1729 pmc->tomb = NULL; 1730 for (psf=pmc->sources; psf; psf=nextpsf) { 1731 nextpsf = psf->sf_next; 1732 kfree(psf); 1733 } 1734 pmc->sources = NULL; 1735 pmc->sfmode = MCAST_EXCLUDE; 1736 pmc->sfcount[MCAST_INCLUDE] = 0; 1737 pmc->sfcount[MCAST_EXCLUDE] = 1; 1738 } 1739 1740 1741 /* 1742 * Join a multicast group 1743 */ 1744 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1745 { 1746 int err; 1747 __be32 addr = imr->imr_multiaddr.s_addr; 1748 struct ip_mc_socklist *iml=NULL, *i; 1749 struct in_device *in_dev; 1750 struct inet_sock *inet = inet_sk(sk); 1751 int ifindex; 1752 int count = 0; 1753 1754 if (!MULTICAST(addr)) 1755 return -EINVAL; 1756 1757 rtnl_lock(); 1758 1759 in_dev = ip_mc_find_dev(imr); 1760 1761 if (!in_dev) { 1762 iml = NULL; 1763 err = -ENODEV; 1764 goto done; 1765 } 1766 1767 err = -EADDRINUSE; 1768 ifindex = imr->imr_ifindex; 1769 for (i = inet->mc_list; i; i = i->next) { 1770 if (i->multi.imr_multiaddr.s_addr == addr && 1771 i->multi.imr_ifindex == ifindex) 1772 goto done; 1773 count++; 1774 } 1775 err = -ENOBUFS; 1776 if (count >= sysctl_igmp_max_memberships) 1777 goto done; 1778 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1779 if (iml == NULL) 1780 goto done; 1781 1782 memcpy(&iml->multi, imr, sizeof(*imr)); 1783 iml->next = inet->mc_list; 1784 iml->sflist = NULL; 1785 iml->sfmode = MCAST_EXCLUDE; 1786 inet->mc_list = iml; 1787 ip_mc_inc_group(in_dev, addr); 1788 err = 0; 1789 done: 1790 rtnl_unlock(); 1791 return err; 1792 } 1793 1794 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1795 struct in_device *in_dev) 1796 { 1797 int err; 1798 1799 if (iml->sflist == 0) { 1800 /* any-source empty exclude case */ 1801 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1802 iml->sfmode, 0, NULL, 0); 1803 } 1804 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1805 iml->sfmode, iml->sflist->sl_count, 1806 iml->sflist->sl_addr, 0); 1807 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1808 iml->sflist = NULL; 1809 return err; 1810 } 1811 1812 /* 1813 * Ask a socket to leave a group. 1814 */ 1815 1816 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1817 { 1818 struct inet_sock *inet = inet_sk(sk); 1819 struct ip_mc_socklist *iml, **imlp; 1820 struct in_device *in_dev; 1821 __be32 group = imr->imr_multiaddr.s_addr; 1822 u32 ifindex; 1823 int ret = -EADDRNOTAVAIL; 1824 1825 rtnl_lock(); 1826 in_dev = ip_mc_find_dev(imr); 1827 ifindex = imr->imr_ifindex; 1828 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1829 if (iml->multi.imr_multiaddr.s_addr != group) 1830 continue; 1831 if (ifindex) { 1832 if (iml->multi.imr_ifindex != ifindex) 1833 continue; 1834 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1835 iml->multi.imr_address.s_addr) 1836 continue; 1837 1838 (void) ip_mc_leave_src(sk, iml, in_dev); 1839 1840 *imlp = iml->next; 1841 1842 if (in_dev) 1843 ip_mc_dec_group(in_dev, group); 1844 rtnl_unlock(); 1845 sock_kfree_s(sk, iml, sizeof(*iml)); 1846 return 0; 1847 } 1848 if (!in_dev) 1849 ret = -ENODEV; 1850 rtnl_unlock(); 1851 return ret; 1852 } 1853 1854 int ip_mc_source(int add, int omode, struct sock *sk, struct 1855 ip_mreq_source *mreqs, int ifindex) 1856 { 1857 int err; 1858 struct ip_mreqn imr; 1859 __be32 addr = mreqs->imr_multiaddr; 1860 struct ip_mc_socklist *pmc; 1861 struct in_device *in_dev = NULL; 1862 struct inet_sock *inet = inet_sk(sk); 1863 struct ip_sf_socklist *psl; 1864 int leavegroup = 0; 1865 int i, j, rv; 1866 1867 if (!MULTICAST(addr)) 1868 return -EINVAL; 1869 1870 rtnl_lock(); 1871 1872 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1873 imr.imr_address.s_addr = mreqs->imr_interface; 1874 imr.imr_ifindex = ifindex; 1875 in_dev = ip_mc_find_dev(&imr); 1876 1877 if (!in_dev) { 1878 err = -ENODEV; 1879 goto done; 1880 } 1881 err = -EADDRNOTAVAIL; 1882 1883 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1884 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1885 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1886 break; 1887 } 1888 if (!pmc) { /* must have a prior join */ 1889 err = -EINVAL; 1890 goto done; 1891 } 1892 /* if a source filter was set, must be the same mode as before */ 1893 if (pmc->sflist) { 1894 if (pmc->sfmode != omode) { 1895 err = -EINVAL; 1896 goto done; 1897 } 1898 } else if (pmc->sfmode != omode) { 1899 /* allow mode switches for empty-set filters */ 1900 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1901 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1902 NULL, 0); 1903 pmc->sfmode = omode; 1904 } 1905 1906 psl = pmc->sflist; 1907 if (!add) { 1908 if (!psl) 1909 goto done; /* err = -EADDRNOTAVAIL */ 1910 rv = !0; 1911 for (i=0; i<psl->sl_count; i++) { 1912 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1913 sizeof(__be32)); 1914 if (rv == 0) 1915 break; 1916 } 1917 if (rv) /* source not found */ 1918 goto done; /* err = -EADDRNOTAVAIL */ 1919 1920 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1921 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1922 leavegroup = 1; 1923 goto done; 1924 } 1925 1926 /* update the interface filter */ 1927 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1928 &mreqs->imr_sourceaddr, 1); 1929 1930 for (j=i+1; j<psl->sl_count; j++) 1931 psl->sl_addr[j-1] = psl->sl_addr[j]; 1932 psl->sl_count--; 1933 err = 0; 1934 goto done; 1935 } 1936 /* else, add a new source to the filter */ 1937 1938 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1939 err = -ENOBUFS; 1940 goto done; 1941 } 1942 if (!psl || psl->sl_count == psl->sl_max) { 1943 struct ip_sf_socklist *newpsl; 1944 int count = IP_SFBLOCK; 1945 1946 if (psl) 1947 count += psl->sl_max; 1948 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1949 if (!newpsl) { 1950 err = -ENOBUFS; 1951 goto done; 1952 } 1953 newpsl->sl_max = count; 1954 newpsl->sl_count = count - IP_SFBLOCK; 1955 if (psl) { 1956 for (i=0; i<psl->sl_count; i++) 1957 newpsl->sl_addr[i] = psl->sl_addr[i]; 1958 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1959 } 1960 pmc->sflist = psl = newpsl; 1961 } 1962 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1963 for (i=0; i<psl->sl_count; i++) { 1964 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1965 sizeof(__be32)); 1966 if (rv == 0) 1967 break; 1968 } 1969 if (rv == 0) /* address already there is an error */ 1970 goto done; 1971 for (j=psl->sl_count-1; j>=i; j--) 1972 psl->sl_addr[j+1] = psl->sl_addr[j]; 1973 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1974 psl->sl_count++; 1975 err = 0; 1976 /* update the interface list */ 1977 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1978 &mreqs->imr_sourceaddr, 1); 1979 done: 1980 rtnl_unlock(); 1981 if (leavegroup) 1982 return ip_mc_leave_group(sk, &imr); 1983 return err; 1984 } 1985 1986 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1987 { 1988 int err = 0; 1989 struct ip_mreqn imr; 1990 __be32 addr = msf->imsf_multiaddr; 1991 struct ip_mc_socklist *pmc; 1992 struct in_device *in_dev; 1993 struct inet_sock *inet = inet_sk(sk); 1994 struct ip_sf_socklist *newpsl, *psl; 1995 int leavegroup = 0; 1996 1997 if (!MULTICAST(addr)) 1998 return -EINVAL; 1999 if (msf->imsf_fmode != MCAST_INCLUDE && 2000 msf->imsf_fmode != MCAST_EXCLUDE) 2001 return -EINVAL; 2002 2003 rtnl_lock(); 2004 2005 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2006 imr.imr_address.s_addr = msf->imsf_interface; 2007 imr.imr_ifindex = ifindex; 2008 in_dev = ip_mc_find_dev(&imr); 2009 2010 if (!in_dev) { 2011 err = -ENODEV; 2012 goto done; 2013 } 2014 2015 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2016 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2017 leavegroup = 1; 2018 goto done; 2019 } 2020 2021 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2022 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2023 pmc->multi.imr_ifindex == imr.imr_ifindex) 2024 break; 2025 } 2026 if (!pmc) { /* must have a prior join */ 2027 err = -EINVAL; 2028 goto done; 2029 } 2030 if (msf->imsf_numsrc) { 2031 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2032 GFP_KERNEL); 2033 if (!newpsl) { 2034 err = -ENOBUFS; 2035 goto done; 2036 } 2037 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2038 memcpy(newpsl->sl_addr, msf->imsf_slist, 2039 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2040 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2041 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2042 if (err) { 2043 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2044 goto done; 2045 } 2046 } else { 2047 newpsl = NULL; 2048 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2049 msf->imsf_fmode, 0, NULL, 0); 2050 } 2051 psl = pmc->sflist; 2052 if (psl) { 2053 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2054 psl->sl_count, psl->sl_addr, 0); 2055 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2056 } else 2057 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2058 0, NULL, 0); 2059 pmc->sflist = newpsl; 2060 pmc->sfmode = msf->imsf_fmode; 2061 err = 0; 2062 done: 2063 rtnl_unlock(); 2064 if (leavegroup) 2065 err = ip_mc_leave_group(sk, &imr); 2066 return err; 2067 } 2068 2069 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2070 struct ip_msfilter __user *optval, int __user *optlen) 2071 { 2072 int err, len, count, copycount; 2073 struct ip_mreqn imr; 2074 __be32 addr = msf->imsf_multiaddr; 2075 struct ip_mc_socklist *pmc; 2076 struct in_device *in_dev; 2077 struct inet_sock *inet = inet_sk(sk); 2078 struct ip_sf_socklist *psl; 2079 2080 if (!MULTICAST(addr)) 2081 return -EINVAL; 2082 2083 rtnl_lock(); 2084 2085 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2086 imr.imr_address.s_addr = msf->imsf_interface; 2087 imr.imr_ifindex = 0; 2088 in_dev = ip_mc_find_dev(&imr); 2089 2090 if (!in_dev) { 2091 err = -ENODEV; 2092 goto done; 2093 } 2094 err = -EADDRNOTAVAIL; 2095 2096 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2097 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2098 pmc->multi.imr_ifindex == imr.imr_ifindex) 2099 break; 2100 } 2101 if (!pmc) /* must have a prior join */ 2102 goto done; 2103 msf->imsf_fmode = pmc->sfmode; 2104 psl = pmc->sflist; 2105 rtnl_unlock(); 2106 if (!psl) { 2107 len = 0; 2108 count = 0; 2109 } else { 2110 count = psl->sl_count; 2111 } 2112 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2113 len = copycount * sizeof(psl->sl_addr[0]); 2114 msf->imsf_numsrc = count; 2115 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2116 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2117 return -EFAULT; 2118 } 2119 if (len && 2120 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2121 return -EFAULT; 2122 return 0; 2123 done: 2124 rtnl_unlock(); 2125 return err; 2126 } 2127 2128 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2129 struct group_filter __user *optval, int __user *optlen) 2130 { 2131 int err, i, count, copycount; 2132 struct sockaddr_in *psin; 2133 __be32 addr; 2134 struct ip_mc_socklist *pmc; 2135 struct inet_sock *inet = inet_sk(sk); 2136 struct ip_sf_socklist *psl; 2137 2138 psin = (struct sockaddr_in *)&gsf->gf_group; 2139 if (psin->sin_family != AF_INET) 2140 return -EINVAL; 2141 addr = psin->sin_addr.s_addr; 2142 if (!MULTICAST(addr)) 2143 return -EINVAL; 2144 2145 rtnl_lock(); 2146 2147 err = -EADDRNOTAVAIL; 2148 2149 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2150 if (pmc->multi.imr_multiaddr.s_addr == addr && 2151 pmc->multi.imr_ifindex == gsf->gf_interface) 2152 break; 2153 } 2154 if (!pmc) /* must have a prior join */ 2155 goto done; 2156 gsf->gf_fmode = pmc->sfmode; 2157 psl = pmc->sflist; 2158 rtnl_unlock(); 2159 count = psl ? psl->sl_count : 0; 2160 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2161 gsf->gf_numsrc = count; 2162 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2163 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2164 return -EFAULT; 2165 } 2166 for (i=0; i<copycount; i++) { 2167 struct sockaddr_in *psin; 2168 struct sockaddr_storage ss; 2169 2170 psin = (struct sockaddr_in *)&ss; 2171 memset(&ss, 0, sizeof(ss)); 2172 psin->sin_family = AF_INET; 2173 psin->sin_addr.s_addr = psl->sl_addr[i]; 2174 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2175 return -EFAULT; 2176 } 2177 return 0; 2178 done: 2179 rtnl_unlock(); 2180 return err; 2181 } 2182 2183 /* 2184 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2185 */ 2186 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2187 { 2188 struct inet_sock *inet = inet_sk(sk); 2189 struct ip_mc_socklist *pmc; 2190 struct ip_sf_socklist *psl; 2191 int i; 2192 2193 if (!MULTICAST(loc_addr)) 2194 return 1; 2195 2196 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2197 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2198 pmc->multi.imr_ifindex == dif) 2199 break; 2200 } 2201 if (!pmc) 2202 return 1; 2203 psl = pmc->sflist; 2204 if (!psl) 2205 return pmc->sfmode == MCAST_EXCLUDE; 2206 2207 for (i=0; i<psl->sl_count; i++) { 2208 if (psl->sl_addr[i] == rmt_addr) 2209 break; 2210 } 2211 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2212 return 0; 2213 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2214 return 0; 2215 return 1; 2216 } 2217 2218 /* 2219 * A socket is closing. 2220 */ 2221 2222 void ip_mc_drop_socket(struct sock *sk) 2223 { 2224 struct inet_sock *inet = inet_sk(sk); 2225 struct ip_mc_socklist *iml; 2226 2227 if (inet->mc_list == NULL) 2228 return; 2229 2230 rtnl_lock(); 2231 while ((iml = inet->mc_list) != NULL) { 2232 struct in_device *in_dev; 2233 inet->mc_list = iml->next; 2234 2235 in_dev = inetdev_by_index(iml->multi.imr_ifindex); 2236 (void) ip_mc_leave_src(sk, iml, in_dev); 2237 if (in_dev != NULL) { 2238 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2239 in_dev_put(in_dev); 2240 } 2241 sock_kfree_s(sk, iml, sizeof(*iml)); 2242 } 2243 rtnl_unlock(); 2244 } 2245 2246 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2247 { 2248 struct ip_mc_list *im; 2249 struct ip_sf_list *psf; 2250 int rv = 0; 2251 2252 read_lock(&in_dev->mc_list_lock); 2253 for (im=in_dev->mc_list; im; im=im->next) { 2254 if (im->multiaddr == mc_addr) 2255 break; 2256 } 2257 if (im && proto == IPPROTO_IGMP) { 2258 rv = 1; 2259 } else if (im) { 2260 if (src_addr) { 2261 for (psf=im->sources; psf; psf=psf->sf_next) { 2262 if (psf->sf_inaddr == src_addr) 2263 break; 2264 } 2265 if (psf) 2266 rv = psf->sf_count[MCAST_INCLUDE] || 2267 psf->sf_count[MCAST_EXCLUDE] != 2268 im->sfcount[MCAST_EXCLUDE]; 2269 else 2270 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2271 } else 2272 rv = 1; /* unspecified source; tentatively allow */ 2273 } 2274 read_unlock(&in_dev->mc_list_lock); 2275 return rv; 2276 } 2277 2278 #if defined(CONFIG_PROC_FS) 2279 struct igmp_mc_iter_state { 2280 struct net_device *dev; 2281 struct in_device *in_dev; 2282 }; 2283 2284 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2285 2286 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2287 { 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(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 2309 static 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 2332 static 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 2341 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2342 { 2343 read_lock(&dev_base_lock); 2344 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2345 } 2346 2347 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2348 { 2349 struct ip_mc_list *im; 2350 if (v == SEQ_START_TOKEN) 2351 im = igmp_mc_get_first(seq); 2352 else 2353 im = igmp_mc_get_next(seq, v); 2354 ++*pos; 2355 return im; 2356 } 2357 2358 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2359 { 2360 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2361 if (likely(state->in_dev != NULL)) { 2362 read_unlock(&state->in_dev->mc_list_lock); 2363 in_dev_put(state->in_dev); 2364 state->in_dev = NULL; 2365 } 2366 state->dev = NULL; 2367 read_unlock(&dev_base_lock); 2368 } 2369 2370 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2371 { 2372 if (v == SEQ_START_TOKEN) 2373 seq_puts(seq, 2374 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2375 else { 2376 struct ip_mc_list *im = (struct ip_mc_list *)v; 2377 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2378 char *querier; 2379 #ifdef CONFIG_IP_MULTICAST 2380 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2381 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2382 "V3"; 2383 #else 2384 querier = "NONE"; 2385 #endif 2386 2387 if (state->in_dev->mc_list == im) { 2388 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2389 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2390 } 2391 2392 seq_printf(seq, 2393 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2394 im->multiaddr, im->users, 2395 im->tm_running, im->tm_running ? 2396 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2397 im->reporter); 2398 } 2399 return 0; 2400 } 2401 2402 static const struct seq_operations igmp_mc_seq_ops = { 2403 .start = igmp_mc_seq_start, 2404 .next = igmp_mc_seq_next, 2405 .stop = igmp_mc_seq_stop, 2406 .show = igmp_mc_seq_show, 2407 }; 2408 2409 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2410 { 2411 struct seq_file *seq; 2412 int rc = -ENOMEM; 2413 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2414 2415 if (!s) 2416 goto out; 2417 rc = seq_open(file, &igmp_mc_seq_ops); 2418 if (rc) 2419 goto out_kfree; 2420 2421 seq = file->private_data; 2422 seq->private = s; 2423 out: 2424 return rc; 2425 out_kfree: 2426 kfree(s); 2427 goto out; 2428 } 2429 2430 static const struct file_operations igmp_mc_seq_fops = { 2431 .owner = THIS_MODULE, 2432 .open = igmp_mc_seq_open, 2433 .read = seq_read, 2434 .llseek = seq_lseek, 2435 .release = seq_release_private, 2436 }; 2437 2438 struct igmp_mcf_iter_state { 2439 struct net_device *dev; 2440 struct in_device *idev; 2441 struct ip_mc_list *im; 2442 }; 2443 2444 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2445 2446 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2447 { 2448 struct ip_sf_list *psf = NULL; 2449 struct ip_mc_list *im = NULL; 2450 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2451 2452 state->idev = NULL; 2453 state->im = NULL; 2454 for_each_netdev(state->dev) { 2455 struct in_device *idev; 2456 idev = in_dev_get(state->dev); 2457 if (unlikely(idev == NULL)) 2458 continue; 2459 read_lock(&idev->mc_list_lock); 2460 im = idev->mc_list; 2461 if (likely(im != NULL)) { 2462 spin_lock_bh(&im->lock); 2463 psf = im->sources; 2464 if (likely(psf != NULL)) { 2465 state->im = im; 2466 state->idev = idev; 2467 break; 2468 } 2469 spin_unlock_bh(&im->lock); 2470 } 2471 read_unlock(&idev->mc_list_lock); 2472 in_dev_put(idev); 2473 } 2474 return psf; 2475 } 2476 2477 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2478 { 2479 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2480 2481 psf = psf->sf_next; 2482 while (!psf) { 2483 spin_unlock_bh(&state->im->lock); 2484 state->im = state->im->next; 2485 while (!state->im) { 2486 if (likely(state->idev != NULL)) { 2487 read_unlock(&state->idev->mc_list_lock); 2488 in_dev_put(state->idev); 2489 } 2490 state->dev = next_net_device(state->dev); 2491 if (!state->dev) { 2492 state->idev = NULL; 2493 goto out; 2494 } 2495 state->idev = in_dev_get(state->dev); 2496 if (!state->idev) 2497 continue; 2498 read_lock(&state->idev->mc_list_lock); 2499 state->im = state->idev->mc_list; 2500 } 2501 if (!state->im) 2502 break; 2503 spin_lock_bh(&state->im->lock); 2504 psf = state->im->sources; 2505 } 2506 out: 2507 return psf; 2508 } 2509 2510 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2511 { 2512 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2513 if (psf) 2514 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2515 --pos; 2516 return pos ? NULL : psf; 2517 } 2518 2519 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2520 { 2521 read_lock(&dev_base_lock); 2522 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2523 } 2524 2525 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2526 { 2527 struct ip_sf_list *psf; 2528 if (v == SEQ_START_TOKEN) 2529 psf = igmp_mcf_get_first(seq); 2530 else 2531 psf = igmp_mcf_get_next(seq, v); 2532 ++*pos; 2533 return psf; 2534 } 2535 2536 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2537 { 2538 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2539 if (likely(state->im != NULL)) { 2540 spin_unlock_bh(&state->im->lock); 2541 state->im = NULL; 2542 } 2543 if (likely(state->idev != NULL)) { 2544 read_unlock(&state->idev->mc_list_lock); 2545 in_dev_put(state->idev); 2546 state->idev = NULL; 2547 } 2548 state->dev = NULL; 2549 read_unlock(&dev_base_lock); 2550 } 2551 2552 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2553 { 2554 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2555 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2556 2557 if (v == SEQ_START_TOKEN) { 2558 seq_printf(seq, 2559 "%3s %6s " 2560 "%10s %10s %6s %6s\n", "Idx", 2561 "Device", "MCA", 2562 "SRC", "INC", "EXC"); 2563 } else { 2564 seq_printf(seq, 2565 "%3d %6.6s 0x%08x " 2566 "0x%08x %6lu %6lu\n", 2567 state->dev->ifindex, state->dev->name, 2568 ntohl(state->im->multiaddr), 2569 ntohl(psf->sf_inaddr), 2570 psf->sf_count[MCAST_INCLUDE], 2571 psf->sf_count[MCAST_EXCLUDE]); 2572 } 2573 return 0; 2574 } 2575 2576 static const struct seq_operations igmp_mcf_seq_ops = { 2577 .start = igmp_mcf_seq_start, 2578 .next = igmp_mcf_seq_next, 2579 .stop = igmp_mcf_seq_stop, 2580 .show = igmp_mcf_seq_show, 2581 }; 2582 2583 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2584 { 2585 struct seq_file *seq; 2586 int rc = -ENOMEM; 2587 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2588 2589 if (!s) 2590 goto out; 2591 rc = seq_open(file, &igmp_mcf_seq_ops); 2592 if (rc) 2593 goto out_kfree; 2594 2595 seq = file->private_data; 2596 seq->private = s; 2597 out: 2598 return rc; 2599 out_kfree: 2600 kfree(s); 2601 goto out; 2602 } 2603 2604 static const struct file_operations igmp_mcf_seq_fops = { 2605 .owner = THIS_MODULE, 2606 .open = igmp_mcf_seq_open, 2607 .read = seq_read, 2608 .llseek = seq_lseek, 2609 .release = seq_release_private, 2610 }; 2611 2612 int __init igmp_mc_proc_init(void) 2613 { 2614 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); 2615 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2616 return 0; 2617 } 2618 #endif 2619 2620 EXPORT_SYMBOL(ip_mc_dec_group); 2621 EXPORT_SYMBOL(ip_mc_inc_group); 2622 EXPORT_SYMBOL(ip_mc_join_group); 2623 EXPORT_SYMBOL(ip_mc_rejoin_group); 2624