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) \ 132 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 1 || \ 133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 134 ((in_dev)->mr_v1_seen && \ 135 time_before(jiffies, (in_dev)->mr_v1_seen))) 136 #define IGMP_V2_SEEN(in_dev) \ 137 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 2 || \ 138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 139 ((in_dev)->mr_v2_seen && \ 140 time_before(jiffies, (in_dev)->mr_v2_seen))) 141 142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 144 static void igmpv3_clear_delrec(struct in_device *in_dev); 145 static int sf_setstate(struct ip_mc_list *pmc); 146 static void sf_markstate(struct ip_mc_list *pmc); 147 #endif 148 static void ip_mc_clear_src(struct ip_mc_list *pmc); 149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 150 int sfcount, __be32 *psfsrc, int delta); 151 152 static void ip_ma_put(struct ip_mc_list *im) 153 { 154 if (atomic_dec_and_test(&im->refcnt)) { 155 in_dev_put(im->interface); 156 kfree(im); 157 } 158 } 159 160 #ifdef CONFIG_IP_MULTICAST 161 162 /* 163 * Timer management 164 */ 165 166 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 167 { 168 spin_lock_bh(&im->lock); 169 if (del_timer(&im->timer)) 170 atomic_dec(&im->refcnt); 171 im->tm_running=0; 172 im->reporter = 0; 173 im->unsolicit_count = 0; 174 spin_unlock_bh(&im->lock); 175 } 176 177 /* It must be called with locked im->lock */ 178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 179 { 180 int tv=net_random() % max_delay; 181 182 im->tm_running=1; 183 if (!mod_timer(&im->timer, jiffies+tv+2)) 184 atomic_inc(&im->refcnt); 185 } 186 187 static void igmp_gq_start_timer(struct in_device *in_dev) 188 { 189 int tv = net_random() % in_dev->mr_maxdelay; 190 191 in_dev->mr_gq_running = 1; 192 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 193 in_dev_hold(in_dev); 194 } 195 196 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 197 { 198 int tv = net_random() % delay; 199 200 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 201 in_dev_hold(in_dev); 202 } 203 204 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 205 { 206 spin_lock_bh(&im->lock); 207 im->unsolicit_count = 0; 208 if (del_timer(&im->timer)) { 209 if ((long)(im->timer.expires-jiffies) < max_delay) { 210 add_timer(&im->timer); 211 im->tm_running=1; 212 spin_unlock_bh(&im->lock); 213 return; 214 } 215 atomic_dec(&im->refcnt); 216 } 217 igmp_start_timer(im, max_delay); 218 spin_unlock_bh(&im->lock); 219 } 220 221 222 /* 223 * Send an IGMP report. 224 */ 225 226 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 227 228 229 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 230 int gdeleted, int sdeleted) 231 { 232 switch (type) { 233 case IGMPV3_MODE_IS_INCLUDE: 234 case IGMPV3_MODE_IS_EXCLUDE: 235 if (gdeleted || sdeleted) 236 return 0; 237 if (!(pmc->gsquery && !psf->sf_gsresp)) { 238 if (pmc->sfmode == MCAST_INCLUDE) 239 return 1; 240 /* don't include if this source is excluded 241 * in all filters 242 */ 243 if (psf->sf_count[MCAST_INCLUDE]) 244 return type == IGMPV3_MODE_IS_INCLUDE; 245 return pmc->sfcount[MCAST_EXCLUDE] == 246 psf->sf_count[MCAST_EXCLUDE]; 247 } 248 return 0; 249 case IGMPV3_CHANGE_TO_INCLUDE: 250 if (gdeleted || sdeleted) 251 return 0; 252 return psf->sf_count[MCAST_INCLUDE] != 0; 253 case IGMPV3_CHANGE_TO_EXCLUDE: 254 if (gdeleted || sdeleted) 255 return 0; 256 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 257 psf->sf_count[MCAST_INCLUDE]) 258 return 0; 259 return pmc->sfcount[MCAST_EXCLUDE] == 260 psf->sf_count[MCAST_EXCLUDE]; 261 case IGMPV3_ALLOW_NEW_SOURCES: 262 if (gdeleted || !psf->sf_crcount) 263 return 0; 264 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 265 case IGMPV3_BLOCK_OLD_SOURCES: 266 if (pmc->sfmode == MCAST_INCLUDE) 267 return gdeleted || (psf->sf_crcount && sdeleted); 268 return psf->sf_crcount && !gdeleted && !sdeleted; 269 } 270 return 0; 271 } 272 273 static int 274 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 275 { 276 struct ip_sf_list *psf; 277 int scount = 0; 278 279 for (psf=pmc->sources; psf; psf=psf->sf_next) { 280 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 281 continue; 282 scount++; 283 } 284 return scount; 285 } 286 287 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 288 { 289 struct sk_buff *skb; 290 struct rtable *rt; 291 struct iphdr *pip; 292 struct igmpv3_report *pig; 293 294 skb = alloc_skb(size + LL_RESERVED_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(&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 } 348 349 static int igmpv3_sendpack(struct sk_buff *skb) 350 { 351 struct iphdr *pip = ip_hdr(skb); 352 struct igmphdr *pig = igmp_hdr(skb); 353 const int iplen = skb->tail - skb->network_header; 354 const int igmplen = skb->tail - skb->transport_header; 355 356 pip->tot_len = htons(iplen); 357 ip_send_check(pip); 358 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 359 360 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, 361 dst_output); 362 } 363 364 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 365 { 366 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 367 } 368 369 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 370 int type, struct igmpv3_grec **ppgr) 371 { 372 struct net_device *dev = pmc->interface->dev; 373 struct igmpv3_report *pih; 374 struct igmpv3_grec *pgr; 375 376 if (!skb) 377 skb = igmpv3_newpack(dev, dev->mtu); 378 if (!skb) 379 return NULL; 380 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 381 pgr->grec_type = type; 382 pgr->grec_auxwords = 0; 383 pgr->grec_nsrcs = 0; 384 pgr->grec_mca = pmc->multiaddr; 385 pih = igmpv3_report_hdr(skb); 386 pih->ngrec = htons(ntohs(pih->ngrec)+1); 387 *ppgr = pgr; 388 return skb; 389 } 390 391 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 392 skb_tailroom(skb)) : 0) 393 394 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 395 int type, int gdeleted, int sdeleted) 396 { 397 struct net_device *dev = pmc->interface->dev; 398 struct igmpv3_report *pih; 399 struct igmpv3_grec *pgr = NULL; 400 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 401 int scount, stotal, first, isquery, truncate; 402 403 if (pmc->multiaddr == IGMP_ALL_HOSTS) 404 return skb; 405 406 isquery = type == IGMPV3_MODE_IS_INCLUDE || 407 type == IGMPV3_MODE_IS_EXCLUDE; 408 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 409 type == IGMPV3_CHANGE_TO_EXCLUDE; 410 411 stotal = scount = 0; 412 413 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 414 415 if (!*psf_list) 416 goto empty_source; 417 418 pih = skb ? igmpv3_report_hdr(skb) : NULL; 419 420 /* EX and TO_EX get a fresh packet, if needed */ 421 if (truncate) { 422 if (pih && pih->ngrec && 423 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 424 if (skb) 425 igmpv3_sendpack(skb); 426 skb = igmpv3_newpack(dev, dev->mtu); 427 } 428 } 429 first = 1; 430 psf_prev = NULL; 431 for (psf=*psf_list; psf; psf=psf_next) { 432 __be32 *psrc; 433 434 psf_next = psf->sf_next; 435 436 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 437 psf_prev = psf; 438 continue; 439 } 440 441 /* clear marks on query responses */ 442 if (isquery) 443 psf->sf_gsresp = 0; 444 445 if (AVAILABLE(skb) < sizeof(__be32) + 446 first*sizeof(struct igmpv3_grec)) { 447 if (truncate && !first) 448 break; /* truncate these */ 449 if (pgr) 450 pgr->grec_nsrcs = htons(scount); 451 if (skb) 452 igmpv3_sendpack(skb); 453 skb = igmpv3_newpack(dev, dev->mtu); 454 first = 1; 455 scount = 0; 456 } 457 if (first) { 458 skb = add_grhead(skb, pmc, type, &pgr); 459 first = 0; 460 } 461 if (!skb) 462 return NULL; 463 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 464 *psrc = psf->sf_inaddr; 465 scount++; stotal++; 466 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 467 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 468 psf->sf_crcount--; 469 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 470 if (psf_prev) 471 psf_prev->sf_next = psf->sf_next; 472 else 473 *psf_list = psf->sf_next; 474 kfree(psf); 475 continue; 476 } 477 } 478 psf_prev = psf; 479 } 480 481 empty_source: 482 if (!stotal) { 483 if (type == IGMPV3_ALLOW_NEW_SOURCES || 484 type == IGMPV3_BLOCK_OLD_SOURCES) 485 return skb; 486 if (pmc->crcount || isquery) { 487 /* make sure we have room for group header */ 488 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 489 igmpv3_sendpack(skb); 490 skb = NULL; /* add_grhead will get a new one */ 491 } 492 skb = add_grhead(skb, pmc, type, &pgr); 493 } 494 } 495 if (pgr) 496 pgr->grec_nsrcs = htons(scount); 497 498 if (isquery) 499 pmc->gsquery = 0; /* clear query state on report */ 500 return skb; 501 } 502 503 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 504 { 505 struct sk_buff *skb = NULL; 506 int type; 507 508 if (!pmc) { 509 read_lock(&in_dev->mc_list_lock); 510 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 511 if (pmc->multiaddr == IGMP_ALL_HOSTS) 512 continue; 513 spin_lock_bh(&pmc->lock); 514 if (pmc->sfcount[MCAST_EXCLUDE]) 515 type = IGMPV3_MODE_IS_EXCLUDE; 516 else 517 type = IGMPV3_MODE_IS_INCLUDE; 518 skb = add_grec(skb, pmc, type, 0, 0); 519 spin_unlock_bh(&pmc->lock); 520 } 521 read_unlock(&in_dev->mc_list_lock); 522 } else { 523 spin_lock_bh(&pmc->lock); 524 if (pmc->sfcount[MCAST_EXCLUDE]) 525 type = IGMPV3_MODE_IS_EXCLUDE; 526 else 527 type = IGMPV3_MODE_IS_INCLUDE; 528 skb = add_grec(skb, pmc, type, 0, 0); 529 spin_unlock_bh(&pmc->lock); 530 } 531 if (!skb) 532 return 0; 533 return igmpv3_sendpack(skb); 534 } 535 536 /* 537 * remove zero-count source records from a source filter list 538 */ 539 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 540 { 541 struct ip_sf_list *psf_prev, *psf_next, *psf; 542 543 psf_prev = NULL; 544 for (psf=*ppsf; psf; psf = psf_next) { 545 psf_next = psf->sf_next; 546 if (psf->sf_crcount == 0) { 547 if (psf_prev) 548 psf_prev->sf_next = psf->sf_next; 549 else 550 *ppsf = psf->sf_next; 551 kfree(psf); 552 } else 553 psf_prev = psf; 554 } 555 } 556 557 static void igmpv3_send_cr(struct in_device *in_dev) 558 { 559 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 560 struct sk_buff *skb = NULL; 561 int type, dtype; 562 563 read_lock(&in_dev->mc_list_lock); 564 spin_lock_bh(&in_dev->mc_tomb_lock); 565 566 /* deleted MCA's */ 567 pmc_prev = NULL; 568 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 569 pmc_next = pmc->next; 570 if (pmc->sfmode == MCAST_INCLUDE) { 571 type = IGMPV3_BLOCK_OLD_SOURCES; 572 dtype = IGMPV3_BLOCK_OLD_SOURCES; 573 skb = add_grec(skb, pmc, type, 1, 0); 574 skb = add_grec(skb, pmc, dtype, 1, 1); 575 } 576 if (pmc->crcount) { 577 if (pmc->sfmode == MCAST_EXCLUDE) { 578 type = IGMPV3_CHANGE_TO_INCLUDE; 579 skb = add_grec(skb, pmc, type, 1, 0); 580 } 581 pmc->crcount--; 582 if (pmc->crcount == 0) { 583 igmpv3_clear_zeros(&pmc->tomb); 584 igmpv3_clear_zeros(&pmc->sources); 585 } 586 } 587 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 588 if (pmc_prev) 589 pmc_prev->next = pmc_next; 590 else 591 in_dev->mc_tomb = pmc_next; 592 in_dev_put(pmc->interface); 593 kfree(pmc); 594 } else 595 pmc_prev = pmc; 596 } 597 spin_unlock_bh(&in_dev->mc_tomb_lock); 598 599 /* change recs */ 600 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 601 spin_lock_bh(&pmc->lock); 602 if (pmc->sfcount[MCAST_EXCLUDE]) { 603 type = IGMPV3_BLOCK_OLD_SOURCES; 604 dtype = IGMPV3_ALLOW_NEW_SOURCES; 605 } else { 606 type = IGMPV3_ALLOW_NEW_SOURCES; 607 dtype = IGMPV3_BLOCK_OLD_SOURCES; 608 } 609 skb = add_grec(skb, pmc, type, 0, 0); 610 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 611 612 /* filter mode changes */ 613 if (pmc->crcount) { 614 if (pmc->sfmode == MCAST_EXCLUDE) 615 type = IGMPV3_CHANGE_TO_EXCLUDE; 616 else 617 type = IGMPV3_CHANGE_TO_INCLUDE; 618 skb = add_grec(skb, pmc, type, 0, 0); 619 pmc->crcount--; 620 } 621 spin_unlock_bh(&pmc->lock); 622 } 623 read_unlock(&in_dev->mc_list_lock); 624 625 if (!skb) 626 return; 627 (void) igmpv3_sendpack(skb); 628 } 629 630 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 631 int type) 632 { 633 struct sk_buff *skb; 634 struct iphdr *iph; 635 struct igmphdr *ih; 636 struct rtable *rt; 637 struct net_device *dev = in_dev->dev; 638 __be32 group = pmc ? pmc->multiaddr : 0; 639 __be32 dst; 640 641 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 642 return igmpv3_send_report(in_dev, pmc); 643 else if (type == IGMP_HOST_LEAVE_MESSAGE) 644 dst = IGMP_ALL_ROUTER; 645 else 646 dst = group; 647 648 { 649 struct flowi fl = { .oif = dev->ifindex, 650 .nl_u = { .ip4_u = { .daddr = dst } }, 651 .proto = IPPROTO_IGMP }; 652 if (ip_route_output_key(&rt, &fl)) 653 return -1; 654 } 655 if (rt->rt_src == 0) { 656 ip_rt_put(rt); 657 return -1; 658 } 659 660 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 661 if (skb == NULL) { 662 ip_rt_put(rt); 663 return -1; 664 } 665 666 skb->dst = &rt->u.dst; 667 668 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 669 670 skb_reset_network_header(skb); 671 iph = ip_hdr(skb); 672 skb_put(skb, sizeof(struct iphdr) + 4); 673 674 iph->version = 4; 675 iph->ihl = (sizeof(struct iphdr)+4)>>2; 676 iph->tos = 0xc0; 677 iph->frag_off = htons(IP_DF); 678 iph->ttl = 1; 679 iph->daddr = dst; 680 iph->saddr = rt->rt_src; 681 iph->protocol = IPPROTO_IGMP; 682 iph->tot_len = htons(IGMP_SIZE); 683 ip_select_ident(iph, &rt->u.dst, NULL); 684 ((u8*)&iph[1])[0] = IPOPT_RA; 685 ((u8*)&iph[1])[1] = 4; 686 ((u8*)&iph[1])[2] = 0; 687 ((u8*)&iph[1])[3] = 0; 688 ip_send_check(iph); 689 690 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 691 ih->type=type; 692 ih->code=0; 693 ih->csum=0; 694 ih->group=group; 695 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 696 697 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 698 dst_output); 699 } 700 701 static void igmp_gq_timer_expire(unsigned long data) 702 { 703 struct in_device *in_dev = (struct in_device *)data; 704 705 in_dev->mr_gq_running = 0; 706 igmpv3_send_report(in_dev, NULL); 707 __in_dev_put(in_dev); 708 } 709 710 static void igmp_ifc_timer_expire(unsigned long data) 711 { 712 struct in_device *in_dev = (struct in_device *)data; 713 714 igmpv3_send_cr(in_dev); 715 if (in_dev->mr_ifc_count) { 716 in_dev->mr_ifc_count--; 717 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 718 } 719 __in_dev_put(in_dev); 720 } 721 722 static void igmp_ifc_event(struct in_device *in_dev) 723 { 724 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 725 return; 726 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 727 IGMP_Unsolicited_Report_Count; 728 igmp_ifc_start_timer(in_dev, 1); 729 } 730 731 732 static void igmp_timer_expire(unsigned long data) 733 { 734 struct ip_mc_list *im=(struct ip_mc_list *)data; 735 struct in_device *in_dev = im->interface; 736 737 spin_lock(&im->lock); 738 im->tm_running=0; 739 740 if (im->unsolicit_count) { 741 im->unsolicit_count--; 742 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 743 } 744 im->reporter = 1; 745 spin_unlock(&im->lock); 746 747 if (IGMP_V1_SEEN(in_dev)) 748 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 749 else if (IGMP_V2_SEEN(in_dev)) 750 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 751 else 752 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 753 754 ip_ma_put(im); 755 } 756 757 /* mark EXCLUDE-mode sources */ 758 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 759 { 760 struct ip_sf_list *psf; 761 int i, scount; 762 763 scount = 0; 764 for (psf=pmc->sources; psf; psf=psf->sf_next) { 765 if (scount == nsrcs) 766 break; 767 for (i=0; i<nsrcs; i++) { 768 /* skip inactive filters */ 769 if (pmc->sfcount[MCAST_INCLUDE] || 770 pmc->sfcount[MCAST_EXCLUDE] != 771 psf->sf_count[MCAST_EXCLUDE]) 772 continue; 773 if (srcs[i] == psf->sf_inaddr) { 774 scount++; 775 break; 776 } 777 } 778 } 779 pmc->gsquery = 0; 780 if (scount == nsrcs) /* all sources excluded */ 781 return 0; 782 return 1; 783 } 784 785 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 786 { 787 struct ip_sf_list *psf; 788 int i, scount; 789 790 if (pmc->sfmode == MCAST_EXCLUDE) 791 return igmp_xmarksources(pmc, nsrcs, srcs); 792 793 /* mark INCLUDE-mode sources */ 794 scount = 0; 795 for (psf=pmc->sources; psf; psf=psf->sf_next) { 796 if (scount == nsrcs) 797 break; 798 for (i=0; i<nsrcs; i++) 799 if (srcs[i] == psf->sf_inaddr) { 800 psf->sf_gsresp = 1; 801 scount++; 802 break; 803 } 804 } 805 if (!scount) { 806 pmc->gsquery = 0; 807 return 0; 808 } 809 pmc->gsquery = 1; 810 return 1; 811 } 812 813 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 814 { 815 struct ip_mc_list *im; 816 817 /* Timers are only set for non-local groups */ 818 819 if (group == IGMP_ALL_HOSTS) 820 return; 821 822 read_lock(&in_dev->mc_list_lock); 823 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 824 if (im->multiaddr == group) { 825 igmp_stop_timer(im); 826 break; 827 } 828 } 829 read_unlock(&in_dev->mc_list_lock); 830 } 831 832 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 833 int len) 834 { 835 struct igmphdr *ih = igmp_hdr(skb); 836 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 837 struct ip_mc_list *im; 838 __be32 group = ih->group; 839 int max_delay; 840 int mark = 0; 841 842 843 if (len == 8) { 844 if (ih->code == 0) { 845 /* Alas, old v1 router presents here. */ 846 847 max_delay = IGMP_Query_Response_Interval; 848 in_dev->mr_v1_seen = jiffies + 849 IGMP_V1_Router_Present_Timeout; 850 group = 0; 851 } else { 852 /* v2 router present */ 853 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 854 in_dev->mr_v2_seen = jiffies + 855 IGMP_V2_Router_Present_Timeout; 856 } 857 /* cancel the interface change timer */ 858 in_dev->mr_ifc_count = 0; 859 if (del_timer(&in_dev->mr_ifc_timer)) 860 __in_dev_put(in_dev); 861 /* clear deleted report items */ 862 igmpv3_clear_delrec(in_dev); 863 } else if (len < 12) { 864 return; /* ignore bogus packet; freed by caller */ 865 } else { /* v3 */ 866 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 867 return; 868 869 ih3 = igmpv3_query_hdr(skb); 870 if (ih3->nsrcs) { 871 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 872 + ntohs(ih3->nsrcs)*sizeof(__be32))) 873 return; 874 ih3 = igmpv3_query_hdr(skb); 875 } 876 877 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 878 if (!max_delay) 879 max_delay = 1; /* can't mod w/ 0 */ 880 in_dev->mr_maxdelay = max_delay; 881 if (ih3->qrv) 882 in_dev->mr_qrv = ih3->qrv; 883 if (!group) { /* general query */ 884 if (ih3->nsrcs) 885 return; /* no sources allowed */ 886 igmp_gq_start_timer(in_dev); 887 return; 888 } 889 /* mark sources to include, if group & source-specific */ 890 mark = ih3->nsrcs != 0; 891 } 892 893 /* 894 * - Start the timers in all of our membership records 895 * that the query applies to for the interface on 896 * which the query arrived excl. those that belong 897 * to a "local" group (224.0.0.X) 898 * - For timers already running check if they need to 899 * be reset. 900 * - Use the igmp->igmp_code field as the maximum 901 * delay possible 902 */ 903 read_lock(&in_dev->mc_list_lock); 904 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 905 int changed; 906 907 if (group && group != im->multiaddr) 908 continue; 909 if (im->multiaddr == IGMP_ALL_HOSTS) 910 continue; 911 spin_lock_bh(&im->lock); 912 if (im->tm_running) 913 im->gsquery = im->gsquery && mark; 914 else 915 im->gsquery = mark; 916 changed = !im->gsquery || 917 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 918 spin_unlock_bh(&im->lock); 919 if (changed) 920 igmp_mod_timer(im, max_delay); 921 } 922 read_unlock(&in_dev->mc_list_lock); 923 } 924 925 int igmp_rcv(struct sk_buff *skb) 926 { 927 /* This basically follows the spec line by line -- see RFC1112 */ 928 struct igmphdr *ih; 929 struct in_device *in_dev = in_dev_get(skb->dev); 930 int len = skb->len; 931 932 if (in_dev==NULL) { 933 kfree_skb(skb); 934 return 0; 935 } 936 937 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 938 goto drop; 939 940 switch (skb->ip_summed) { 941 case CHECKSUM_COMPLETE: 942 if (!csum_fold(skb->csum)) 943 break; 944 /* fall through */ 945 case CHECKSUM_NONE: 946 skb->csum = 0; 947 if (__skb_checksum_complete(skb)) 948 goto drop; 949 } 950 951 ih = igmp_hdr(skb); 952 switch (ih->type) { 953 case IGMP_HOST_MEMBERSHIP_QUERY: 954 igmp_heard_query(in_dev, skb, len); 955 break; 956 case IGMP_HOST_MEMBERSHIP_REPORT: 957 case IGMPV2_HOST_MEMBERSHIP_REPORT: 958 case IGMPV3_HOST_MEMBERSHIP_REPORT: 959 /* Is it our report looped back? */ 960 if (((struct rtable*)skb->dst)->fl.iif == 0) 961 break; 962 /* don't rely on MC router hearing unicast reports */ 963 if (skb->pkt_type == PACKET_MULTICAST || 964 skb->pkt_type == PACKET_BROADCAST) 965 igmp_heard_report(in_dev, ih->group); 966 break; 967 case IGMP_PIM: 968 #ifdef CONFIG_IP_PIMSM_V1 969 in_dev_put(in_dev); 970 return pim_rcv_v1(skb); 971 #endif 972 case IGMP_DVMRP: 973 case IGMP_TRACE: 974 case IGMP_HOST_LEAVE_MESSAGE: 975 case IGMP_MTRACE: 976 case IGMP_MTRACE_RESP: 977 break; 978 default: 979 break; 980 } 981 982 drop: 983 in_dev_put(in_dev); 984 kfree_skb(skb); 985 return 0; 986 } 987 988 #endif 989 990 991 /* 992 * Add a filter to a device 993 */ 994 995 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 996 { 997 char buf[MAX_ADDR_LEN]; 998 struct net_device *dev = in_dev->dev; 999 1000 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1001 We will get multicast token leakage, when IFF_MULTICAST 1002 is changed. This check should be done in dev->set_multicast_list 1003 routine. Something sort of: 1004 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1005 --ANK 1006 */ 1007 if (arp_mc_map(addr, buf, dev, 0) == 0) 1008 dev_mc_add(dev,buf,dev->addr_len,0); 1009 } 1010 1011 /* 1012 * Remove a filter from a device 1013 */ 1014 1015 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1016 { 1017 char buf[MAX_ADDR_LEN]; 1018 struct net_device *dev = in_dev->dev; 1019 1020 if (arp_mc_map(addr, buf, dev, 0) == 0) 1021 dev_mc_delete(dev,buf,dev->addr_len,0); 1022 } 1023 1024 #ifdef CONFIG_IP_MULTICAST 1025 /* 1026 * deleted ip_mc_list manipulation 1027 */ 1028 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1029 { 1030 struct ip_mc_list *pmc; 1031 1032 /* this is an "ip_mc_list" for convenience; only the fields below 1033 * are actually used. In particular, the refcnt and users are not 1034 * used for management of the delete list. Using the same structure 1035 * for deleted items allows change reports to use common code with 1036 * non-deleted or query-response MCA's. 1037 */ 1038 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1039 if (!pmc) 1040 return; 1041 spin_lock_bh(&im->lock); 1042 pmc->interface = im->interface; 1043 in_dev_hold(in_dev); 1044 pmc->multiaddr = im->multiaddr; 1045 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1046 IGMP_Unsolicited_Report_Count; 1047 pmc->sfmode = im->sfmode; 1048 if (pmc->sfmode == MCAST_INCLUDE) { 1049 struct ip_sf_list *psf; 1050 1051 pmc->tomb = im->tomb; 1052 pmc->sources = im->sources; 1053 im->tomb = im->sources = NULL; 1054 for (psf=pmc->sources; psf; psf=psf->sf_next) 1055 psf->sf_crcount = pmc->crcount; 1056 } 1057 spin_unlock_bh(&im->lock); 1058 1059 spin_lock_bh(&in_dev->mc_tomb_lock); 1060 pmc->next = in_dev->mc_tomb; 1061 in_dev->mc_tomb = pmc; 1062 spin_unlock_bh(&in_dev->mc_tomb_lock); 1063 } 1064 1065 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1066 { 1067 struct ip_mc_list *pmc, *pmc_prev; 1068 struct ip_sf_list *psf, *psf_next; 1069 1070 spin_lock_bh(&in_dev->mc_tomb_lock); 1071 pmc_prev = NULL; 1072 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1073 if (pmc->multiaddr == multiaddr) 1074 break; 1075 pmc_prev = pmc; 1076 } 1077 if (pmc) { 1078 if (pmc_prev) 1079 pmc_prev->next = pmc->next; 1080 else 1081 in_dev->mc_tomb = pmc->next; 1082 } 1083 spin_unlock_bh(&in_dev->mc_tomb_lock); 1084 if (pmc) { 1085 for (psf=pmc->tomb; psf; psf=psf_next) { 1086 psf_next = psf->sf_next; 1087 kfree(psf); 1088 } 1089 in_dev_put(pmc->interface); 1090 kfree(pmc); 1091 } 1092 } 1093 1094 static void igmpv3_clear_delrec(struct in_device *in_dev) 1095 { 1096 struct ip_mc_list *pmc, *nextpmc; 1097 1098 spin_lock_bh(&in_dev->mc_tomb_lock); 1099 pmc = in_dev->mc_tomb; 1100 in_dev->mc_tomb = NULL; 1101 spin_unlock_bh(&in_dev->mc_tomb_lock); 1102 1103 for (; pmc; pmc = nextpmc) { 1104 nextpmc = pmc->next; 1105 ip_mc_clear_src(pmc); 1106 in_dev_put(pmc->interface); 1107 kfree(pmc); 1108 } 1109 /* clear dead sources, too */ 1110 read_lock(&in_dev->mc_list_lock); 1111 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1112 struct ip_sf_list *psf, *psf_next; 1113 1114 spin_lock_bh(&pmc->lock); 1115 psf = pmc->tomb; 1116 pmc->tomb = NULL; 1117 spin_unlock_bh(&pmc->lock); 1118 for (; psf; psf=psf_next) { 1119 psf_next = psf->sf_next; 1120 kfree(psf); 1121 } 1122 } 1123 read_unlock(&in_dev->mc_list_lock); 1124 } 1125 #endif 1126 1127 static void igmp_group_dropped(struct ip_mc_list *im) 1128 { 1129 struct in_device *in_dev = im->interface; 1130 #ifdef CONFIG_IP_MULTICAST 1131 int reporter; 1132 #endif 1133 1134 if (im->loaded) { 1135 im->loaded = 0; 1136 ip_mc_filter_del(in_dev, im->multiaddr); 1137 } 1138 1139 #ifdef CONFIG_IP_MULTICAST 1140 if (im->multiaddr == IGMP_ALL_HOSTS) 1141 return; 1142 1143 reporter = im->reporter; 1144 igmp_stop_timer(im); 1145 1146 if (!in_dev->dead) { 1147 if (IGMP_V1_SEEN(in_dev)) 1148 goto done; 1149 if (IGMP_V2_SEEN(in_dev)) { 1150 if (reporter) 1151 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1152 goto done; 1153 } 1154 /* IGMPv3 */ 1155 igmpv3_add_delrec(in_dev, im); 1156 1157 igmp_ifc_event(in_dev); 1158 } 1159 done: 1160 #endif 1161 ip_mc_clear_src(im); 1162 } 1163 1164 static void igmp_group_added(struct ip_mc_list *im) 1165 { 1166 struct in_device *in_dev = im->interface; 1167 1168 if (im->loaded == 0) { 1169 im->loaded = 1; 1170 ip_mc_filter_add(in_dev, im->multiaddr); 1171 } 1172 1173 #ifdef CONFIG_IP_MULTICAST 1174 if (im->multiaddr == IGMP_ALL_HOSTS) 1175 return; 1176 1177 if (in_dev->dead) 1178 return; 1179 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1180 spin_lock_bh(&im->lock); 1181 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1182 spin_unlock_bh(&im->lock); 1183 return; 1184 } 1185 /* else, v3 */ 1186 1187 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1188 IGMP_Unsolicited_Report_Count; 1189 igmp_ifc_event(in_dev); 1190 #endif 1191 } 1192 1193 1194 /* 1195 * Multicast list managers 1196 */ 1197 1198 1199 /* 1200 * A socket has joined a multicast group on device dev. 1201 */ 1202 1203 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1204 { 1205 struct ip_mc_list *im; 1206 1207 ASSERT_RTNL(); 1208 1209 for (im=in_dev->mc_list; im; im=im->next) { 1210 if (im->multiaddr == addr) { 1211 im->users++; 1212 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1213 goto out; 1214 } 1215 } 1216 1217 im = kmalloc(sizeof(*im), GFP_KERNEL); 1218 if (!im) 1219 goto out; 1220 1221 im->users=1; 1222 im->interface=in_dev; 1223 in_dev_hold(in_dev); 1224 im->multiaddr=addr; 1225 /* initial mode is (EX, empty) */ 1226 im->sfmode = MCAST_EXCLUDE; 1227 im->sfcount[MCAST_INCLUDE] = 0; 1228 im->sfcount[MCAST_EXCLUDE] = 1; 1229 im->sources = NULL; 1230 im->tomb = NULL; 1231 im->crcount = 0; 1232 atomic_set(&im->refcnt, 1); 1233 spin_lock_init(&im->lock); 1234 #ifdef CONFIG_IP_MULTICAST 1235 im->tm_running=0; 1236 init_timer(&im->timer); 1237 im->timer.data=(unsigned long)im; 1238 im->timer.function=&igmp_timer_expire; 1239 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1240 im->reporter = 0; 1241 im->gsquery = 0; 1242 #endif 1243 im->loaded = 0; 1244 write_lock_bh(&in_dev->mc_list_lock); 1245 im->next=in_dev->mc_list; 1246 in_dev->mc_list=im; 1247 write_unlock_bh(&in_dev->mc_list_lock); 1248 #ifdef CONFIG_IP_MULTICAST 1249 igmpv3_del_delrec(in_dev, im->multiaddr); 1250 #endif 1251 igmp_group_added(im); 1252 if (!in_dev->dead) 1253 ip_rt_multicast_event(in_dev); 1254 out: 1255 return; 1256 } 1257 1258 /* 1259 * Resend IGMP JOIN report; used for bonding. 1260 */ 1261 void ip_mc_rejoin_group(struct ip_mc_list *im) 1262 { 1263 #ifdef CONFIG_IP_MULTICAST 1264 struct in_device *in_dev = im->interface; 1265 1266 if (im->multiaddr == IGMP_ALL_HOSTS) 1267 return; 1268 1269 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1270 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1271 return; 1272 } 1273 /* else, v3 */ 1274 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1275 IGMP_Unsolicited_Report_Count; 1276 igmp_ifc_event(in_dev); 1277 #endif 1278 } 1279 1280 /* 1281 * A socket has left a multicast group on device dev 1282 */ 1283 1284 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1285 { 1286 struct ip_mc_list *i, **ip; 1287 1288 ASSERT_RTNL(); 1289 1290 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1291 if (i->multiaddr==addr) { 1292 if (--i->users == 0) { 1293 write_lock_bh(&in_dev->mc_list_lock); 1294 *ip = i->next; 1295 write_unlock_bh(&in_dev->mc_list_lock); 1296 igmp_group_dropped(i); 1297 1298 if (!in_dev->dead) 1299 ip_rt_multicast_event(in_dev); 1300 1301 ip_ma_put(i); 1302 return; 1303 } 1304 break; 1305 } 1306 } 1307 } 1308 1309 /* Device going down */ 1310 1311 void ip_mc_down(struct in_device *in_dev) 1312 { 1313 struct ip_mc_list *i; 1314 1315 ASSERT_RTNL(); 1316 1317 for (i=in_dev->mc_list; i; i=i->next) 1318 igmp_group_dropped(i); 1319 1320 #ifdef CONFIG_IP_MULTICAST 1321 in_dev->mr_ifc_count = 0; 1322 if (del_timer(&in_dev->mr_ifc_timer)) 1323 __in_dev_put(in_dev); 1324 in_dev->mr_gq_running = 0; 1325 if (del_timer(&in_dev->mr_gq_timer)) 1326 __in_dev_put(in_dev); 1327 igmpv3_clear_delrec(in_dev); 1328 #endif 1329 1330 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1331 } 1332 1333 void ip_mc_init_dev(struct in_device *in_dev) 1334 { 1335 ASSERT_RTNL(); 1336 1337 in_dev->mc_tomb = NULL; 1338 #ifdef CONFIG_IP_MULTICAST 1339 in_dev->mr_gq_running = 0; 1340 init_timer(&in_dev->mr_gq_timer); 1341 in_dev->mr_gq_timer.data=(unsigned long) in_dev; 1342 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; 1343 in_dev->mr_ifc_count = 0; 1344 init_timer(&in_dev->mr_ifc_timer); 1345 in_dev->mr_ifc_timer.data=(unsigned long) in_dev; 1346 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; 1347 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1348 #endif 1349 1350 rwlock_init(&in_dev->mc_list_lock); 1351 spin_lock_init(&in_dev->mc_tomb_lock); 1352 } 1353 1354 /* Device going up */ 1355 1356 void ip_mc_up(struct in_device *in_dev) 1357 { 1358 struct ip_mc_list *i; 1359 1360 ASSERT_RTNL(); 1361 1362 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1363 1364 for (i=in_dev->mc_list; i; i=i->next) 1365 igmp_group_added(i); 1366 } 1367 1368 /* 1369 * Device is about to be destroyed: clean up. 1370 */ 1371 1372 void ip_mc_destroy_dev(struct in_device *in_dev) 1373 { 1374 struct ip_mc_list *i; 1375 1376 ASSERT_RTNL(); 1377 1378 /* Deactivate timers */ 1379 ip_mc_down(in_dev); 1380 1381 write_lock_bh(&in_dev->mc_list_lock); 1382 while ((i = in_dev->mc_list) != NULL) { 1383 in_dev->mc_list = i->next; 1384 write_unlock_bh(&in_dev->mc_list_lock); 1385 1386 igmp_group_dropped(i); 1387 ip_ma_put(i); 1388 1389 write_lock_bh(&in_dev->mc_list_lock); 1390 } 1391 write_unlock_bh(&in_dev->mc_list_lock); 1392 } 1393 1394 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1395 { 1396 struct flowi fl = { .nl_u = { .ip4_u = 1397 { .daddr = imr->imr_multiaddr.s_addr } } }; 1398 struct rtable *rt; 1399 struct net_device *dev = NULL; 1400 struct in_device *idev = NULL; 1401 1402 if (imr->imr_ifindex) { 1403 idev = inetdev_by_index(imr->imr_ifindex); 1404 if (idev) 1405 __in_dev_put(idev); 1406 return idev; 1407 } 1408 if (imr->imr_address.s_addr) { 1409 dev = ip_dev_find(imr->imr_address.s_addr); 1410 if (!dev) 1411 return NULL; 1412 dev_put(dev); 1413 } 1414 1415 if (!dev && !ip_route_output_key(&rt, &fl)) { 1416 dev = rt->u.dst.dev; 1417 ip_rt_put(rt); 1418 } 1419 if (dev) { 1420 imr->imr_ifindex = dev->ifindex; 1421 idev = __in_dev_get_rtnl(dev); 1422 } 1423 return idev; 1424 } 1425 1426 /* 1427 * Join a socket to a group 1428 */ 1429 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1430 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1431 1432 1433 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1434 __be32 *psfsrc) 1435 { 1436 struct ip_sf_list *psf, *psf_prev; 1437 int rv = 0; 1438 1439 psf_prev = NULL; 1440 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1441 if (psf->sf_inaddr == *psfsrc) 1442 break; 1443 psf_prev = psf; 1444 } 1445 if (!psf || psf->sf_count[sfmode] == 0) { 1446 /* source filter not found, or count wrong => bug */ 1447 return -ESRCH; 1448 } 1449 psf->sf_count[sfmode]--; 1450 if (psf->sf_count[sfmode] == 0) { 1451 ip_rt_multicast_event(pmc->interface); 1452 } 1453 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1454 #ifdef CONFIG_IP_MULTICAST 1455 struct in_device *in_dev = pmc->interface; 1456 #endif 1457 1458 /* no more filters for this source */ 1459 if (psf_prev) 1460 psf_prev->sf_next = psf->sf_next; 1461 else 1462 pmc->sources = psf->sf_next; 1463 #ifdef CONFIG_IP_MULTICAST 1464 if (psf->sf_oldin && 1465 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1466 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1467 IGMP_Unsolicited_Report_Count; 1468 psf->sf_next = pmc->tomb; 1469 pmc->tomb = psf; 1470 rv = 1; 1471 } else 1472 #endif 1473 kfree(psf); 1474 } 1475 return rv; 1476 } 1477 1478 #ifndef CONFIG_IP_MULTICAST 1479 #define igmp_ifc_event(x) do { } while (0) 1480 #endif 1481 1482 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1483 int sfcount, __be32 *psfsrc, int delta) 1484 { 1485 struct ip_mc_list *pmc; 1486 int changerec = 0; 1487 int i, err; 1488 1489 if (!in_dev) 1490 return -ENODEV; 1491 read_lock(&in_dev->mc_list_lock); 1492 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1493 if (*pmca == pmc->multiaddr) 1494 break; 1495 } 1496 if (!pmc) { 1497 /* MCA not found?? bug */ 1498 read_unlock(&in_dev->mc_list_lock); 1499 return -ESRCH; 1500 } 1501 spin_lock_bh(&pmc->lock); 1502 read_unlock(&in_dev->mc_list_lock); 1503 #ifdef CONFIG_IP_MULTICAST 1504 sf_markstate(pmc); 1505 #endif 1506 if (!delta) { 1507 err = -EINVAL; 1508 if (!pmc->sfcount[sfmode]) 1509 goto out_unlock; 1510 pmc->sfcount[sfmode]--; 1511 } 1512 err = 0; 1513 for (i=0; i<sfcount; i++) { 1514 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1515 1516 changerec |= rv > 0; 1517 if (!err && rv < 0) 1518 err = rv; 1519 } 1520 if (pmc->sfmode == MCAST_EXCLUDE && 1521 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1522 pmc->sfcount[MCAST_INCLUDE]) { 1523 #ifdef CONFIG_IP_MULTICAST 1524 struct ip_sf_list *psf; 1525 #endif 1526 1527 /* filter mode change */ 1528 pmc->sfmode = MCAST_INCLUDE; 1529 #ifdef CONFIG_IP_MULTICAST 1530 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1531 IGMP_Unsolicited_Report_Count; 1532 in_dev->mr_ifc_count = pmc->crcount; 1533 for (psf=pmc->sources; psf; psf = psf->sf_next) 1534 psf->sf_crcount = 0; 1535 igmp_ifc_event(pmc->interface); 1536 } else if (sf_setstate(pmc) || changerec) { 1537 igmp_ifc_event(pmc->interface); 1538 #endif 1539 } 1540 out_unlock: 1541 spin_unlock_bh(&pmc->lock); 1542 return err; 1543 } 1544 1545 /* 1546 * Add multicast single-source filter to the interface list 1547 */ 1548 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1549 __be32 *psfsrc, int delta) 1550 { 1551 struct ip_sf_list *psf, *psf_prev; 1552 1553 psf_prev = NULL; 1554 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1555 if (psf->sf_inaddr == *psfsrc) 1556 break; 1557 psf_prev = psf; 1558 } 1559 if (!psf) { 1560 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1561 if (!psf) 1562 return -ENOBUFS; 1563 psf->sf_inaddr = *psfsrc; 1564 if (psf_prev) { 1565 psf_prev->sf_next = psf; 1566 } else 1567 pmc->sources = psf; 1568 } 1569 psf->sf_count[sfmode]++; 1570 if (psf->sf_count[sfmode] == 1) { 1571 ip_rt_multicast_event(pmc->interface); 1572 } 1573 return 0; 1574 } 1575 1576 #ifdef CONFIG_IP_MULTICAST 1577 static void sf_markstate(struct ip_mc_list *pmc) 1578 { 1579 struct ip_sf_list *psf; 1580 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1581 1582 for (psf=pmc->sources; psf; psf=psf->sf_next) 1583 if (pmc->sfcount[MCAST_EXCLUDE]) { 1584 psf->sf_oldin = mca_xcount == 1585 psf->sf_count[MCAST_EXCLUDE] && 1586 !psf->sf_count[MCAST_INCLUDE]; 1587 } else 1588 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1589 } 1590 1591 static int sf_setstate(struct ip_mc_list *pmc) 1592 { 1593 struct ip_sf_list *psf, *dpsf; 1594 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1595 int qrv = pmc->interface->mr_qrv; 1596 int new_in, rv; 1597 1598 rv = 0; 1599 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1600 if (pmc->sfcount[MCAST_EXCLUDE]) { 1601 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1602 !psf->sf_count[MCAST_INCLUDE]; 1603 } else 1604 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1605 if (new_in) { 1606 if (!psf->sf_oldin) { 1607 struct ip_sf_list *prev = NULL; 1608 1609 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1610 if (dpsf->sf_inaddr == psf->sf_inaddr) 1611 break; 1612 prev = dpsf; 1613 } 1614 if (dpsf) { 1615 if (prev) 1616 prev->sf_next = dpsf->sf_next; 1617 else 1618 pmc->tomb = dpsf->sf_next; 1619 kfree(dpsf); 1620 } 1621 psf->sf_crcount = qrv; 1622 rv++; 1623 } 1624 } else if (psf->sf_oldin) { 1625 1626 psf->sf_crcount = 0; 1627 /* 1628 * add or update "delete" records if an active filter 1629 * is now inactive 1630 */ 1631 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1632 if (dpsf->sf_inaddr == psf->sf_inaddr) 1633 break; 1634 if (!dpsf) { 1635 dpsf = (struct ip_sf_list *) 1636 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1637 if (!dpsf) 1638 continue; 1639 *dpsf = *psf; 1640 /* pmc->lock held by callers */ 1641 dpsf->sf_next = pmc->tomb; 1642 pmc->tomb = dpsf; 1643 } 1644 dpsf->sf_crcount = qrv; 1645 rv++; 1646 } 1647 } 1648 return rv; 1649 } 1650 #endif 1651 1652 /* 1653 * Add multicast source filter list to the interface list 1654 */ 1655 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1656 int sfcount, __be32 *psfsrc, int delta) 1657 { 1658 struct ip_mc_list *pmc; 1659 int isexclude; 1660 int i, err; 1661 1662 if (!in_dev) 1663 return -ENODEV; 1664 read_lock(&in_dev->mc_list_lock); 1665 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1666 if (*pmca == pmc->multiaddr) 1667 break; 1668 } 1669 if (!pmc) { 1670 /* MCA not found?? bug */ 1671 read_unlock(&in_dev->mc_list_lock); 1672 return -ESRCH; 1673 } 1674 spin_lock_bh(&pmc->lock); 1675 read_unlock(&in_dev->mc_list_lock); 1676 1677 #ifdef CONFIG_IP_MULTICAST 1678 sf_markstate(pmc); 1679 #endif 1680 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1681 if (!delta) 1682 pmc->sfcount[sfmode]++; 1683 err = 0; 1684 for (i=0; i<sfcount; i++) { 1685 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1686 if (err) 1687 break; 1688 } 1689 if (err) { 1690 int j; 1691 1692 pmc->sfcount[sfmode]--; 1693 for (j=0; j<i; j++) 1694 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1695 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1696 #ifdef CONFIG_IP_MULTICAST 1697 struct in_device *in_dev = pmc->interface; 1698 struct ip_sf_list *psf; 1699 #endif 1700 1701 /* filter mode change */ 1702 if (pmc->sfcount[MCAST_EXCLUDE]) 1703 pmc->sfmode = MCAST_EXCLUDE; 1704 else if (pmc->sfcount[MCAST_INCLUDE]) 1705 pmc->sfmode = MCAST_INCLUDE; 1706 #ifdef CONFIG_IP_MULTICAST 1707 /* else no filters; keep old mode for reports */ 1708 1709 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1710 IGMP_Unsolicited_Report_Count; 1711 in_dev->mr_ifc_count = pmc->crcount; 1712 for (psf=pmc->sources; psf; psf = psf->sf_next) 1713 psf->sf_crcount = 0; 1714 igmp_ifc_event(in_dev); 1715 } else if (sf_setstate(pmc)) { 1716 igmp_ifc_event(in_dev); 1717 #endif 1718 } 1719 spin_unlock_bh(&pmc->lock); 1720 return err; 1721 } 1722 1723 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1724 { 1725 struct ip_sf_list *psf, *nextpsf; 1726 1727 for (psf=pmc->tomb; psf; psf=nextpsf) { 1728 nextpsf = psf->sf_next; 1729 kfree(psf); 1730 } 1731 pmc->tomb = NULL; 1732 for (psf=pmc->sources; psf; psf=nextpsf) { 1733 nextpsf = psf->sf_next; 1734 kfree(psf); 1735 } 1736 pmc->sources = NULL; 1737 pmc->sfmode = MCAST_EXCLUDE; 1738 pmc->sfcount[MCAST_INCLUDE] = 0; 1739 pmc->sfcount[MCAST_EXCLUDE] = 1; 1740 } 1741 1742 1743 /* 1744 * Join a multicast group 1745 */ 1746 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1747 { 1748 int err; 1749 __be32 addr = imr->imr_multiaddr.s_addr; 1750 struct ip_mc_socklist *iml=NULL, *i; 1751 struct in_device *in_dev; 1752 struct inet_sock *inet = inet_sk(sk); 1753 int ifindex; 1754 int count = 0; 1755 1756 if (!MULTICAST(addr)) 1757 return -EINVAL; 1758 1759 rtnl_lock(); 1760 1761 in_dev = ip_mc_find_dev(imr); 1762 1763 if (!in_dev) { 1764 iml = NULL; 1765 err = -ENODEV; 1766 goto done; 1767 } 1768 1769 err = -EADDRINUSE; 1770 ifindex = imr->imr_ifindex; 1771 for (i = inet->mc_list; i; i = i->next) { 1772 if (i->multi.imr_multiaddr.s_addr == addr && 1773 i->multi.imr_ifindex == ifindex) 1774 goto done; 1775 count++; 1776 } 1777 err = -ENOBUFS; 1778 if (count >= sysctl_igmp_max_memberships) 1779 goto done; 1780 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1781 if (iml == NULL) 1782 goto done; 1783 1784 memcpy(&iml->multi, imr, sizeof(*imr)); 1785 iml->next = inet->mc_list; 1786 iml->sflist = NULL; 1787 iml->sfmode = MCAST_EXCLUDE; 1788 inet->mc_list = iml; 1789 ip_mc_inc_group(in_dev, addr); 1790 err = 0; 1791 done: 1792 rtnl_unlock(); 1793 return err; 1794 } 1795 1796 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1797 struct in_device *in_dev) 1798 { 1799 int err; 1800 1801 if (iml->sflist == 0) { 1802 /* any-source empty exclude case */ 1803 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1804 iml->sfmode, 0, NULL, 0); 1805 } 1806 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1807 iml->sfmode, iml->sflist->sl_count, 1808 iml->sflist->sl_addr, 0); 1809 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1810 iml->sflist = NULL; 1811 return err; 1812 } 1813 1814 /* 1815 * Ask a socket to leave a group. 1816 */ 1817 1818 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1819 { 1820 struct inet_sock *inet = inet_sk(sk); 1821 struct ip_mc_socklist *iml, **imlp; 1822 struct in_device *in_dev; 1823 __be32 group = imr->imr_multiaddr.s_addr; 1824 u32 ifindex; 1825 int ret = -EADDRNOTAVAIL; 1826 1827 rtnl_lock(); 1828 in_dev = ip_mc_find_dev(imr); 1829 ifindex = imr->imr_ifindex; 1830 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1831 if (iml->multi.imr_multiaddr.s_addr != group) 1832 continue; 1833 if (ifindex) { 1834 if (iml->multi.imr_ifindex != ifindex) 1835 continue; 1836 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1837 iml->multi.imr_address.s_addr) 1838 continue; 1839 1840 (void) ip_mc_leave_src(sk, iml, in_dev); 1841 1842 *imlp = iml->next; 1843 1844 if (in_dev) 1845 ip_mc_dec_group(in_dev, group); 1846 rtnl_unlock(); 1847 sock_kfree_s(sk, iml, sizeof(*iml)); 1848 return 0; 1849 } 1850 if (!in_dev) 1851 ret = -ENODEV; 1852 rtnl_unlock(); 1853 return ret; 1854 } 1855 1856 int ip_mc_source(int add, int omode, struct sock *sk, struct 1857 ip_mreq_source *mreqs, int ifindex) 1858 { 1859 int err; 1860 struct ip_mreqn imr; 1861 __be32 addr = mreqs->imr_multiaddr; 1862 struct ip_mc_socklist *pmc; 1863 struct in_device *in_dev = NULL; 1864 struct inet_sock *inet = inet_sk(sk); 1865 struct ip_sf_socklist *psl; 1866 int leavegroup = 0; 1867 int i, j, rv; 1868 1869 if (!MULTICAST(addr)) 1870 return -EINVAL; 1871 1872 rtnl_lock(); 1873 1874 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1875 imr.imr_address.s_addr = mreqs->imr_interface; 1876 imr.imr_ifindex = ifindex; 1877 in_dev = ip_mc_find_dev(&imr); 1878 1879 if (!in_dev) { 1880 err = -ENODEV; 1881 goto done; 1882 } 1883 err = -EADDRNOTAVAIL; 1884 1885 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1886 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1887 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1888 break; 1889 } 1890 if (!pmc) { /* must have a prior join */ 1891 err = -EINVAL; 1892 goto done; 1893 } 1894 /* if a source filter was set, must be the same mode as before */ 1895 if (pmc->sflist) { 1896 if (pmc->sfmode != omode) { 1897 err = -EINVAL; 1898 goto done; 1899 } 1900 } else if (pmc->sfmode != omode) { 1901 /* allow mode switches for empty-set filters */ 1902 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1903 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1904 NULL, 0); 1905 pmc->sfmode = omode; 1906 } 1907 1908 psl = pmc->sflist; 1909 if (!add) { 1910 if (!psl) 1911 goto done; /* err = -EADDRNOTAVAIL */ 1912 rv = !0; 1913 for (i=0; i<psl->sl_count; i++) { 1914 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1915 sizeof(__be32)); 1916 if (rv == 0) 1917 break; 1918 } 1919 if (rv) /* source not found */ 1920 goto done; /* err = -EADDRNOTAVAIL */ 1921 1922 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1923 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1924 leavegroup = 1; 1925 goto done; 1926 } 1927 1928 /* update the interface filter */ 1929 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1930 &mreqs->imr_sourceaddr, 1); 1931 1932 for (j=i+1; j<psl->sl_count; j++) 1933 psl->sl_addr[j-1] = psl->sl_addr[j]; 1934 psl->sl_count--; 1935 err = 0; 1936 goto done; 1937 } 1938 /* else, add a new source to the filter */ 1939 1940 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1941 err = -ENOBUFS; 1942 goto done; 1943 } 1944 if (!psl || psl->sl_count == psl->sl_max) { 1945 struct ip_sf_socklist *newpsl; 1946 int count = IP_SFBLOCK; 1947 1948 if (psl) 1949 count += psl->sl_max; 1950 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1951 if (!newpsl) { 1952 err = -ENOBUFS; 1953 goto done; 1954 } 1955 newpsl->sl_max = count; 1956 newpsl->sl_count = count - IP_SFBLOCK; 1957 if (psl) { 1958 for (i=0; i<psl->sl_count; i++) 1959 newpsl->sl_addr[i] = psl->sl_addr[i]; 1960 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1961 } 1962 pmc->sflist = psl = newpsl; 1963 } 1964 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1965 for (i=0; i<psl->sl_count; i++) { 1966 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1967 sizeof(__be32)); 1968 if (rv == 0) 1969 break; 1970 } 1971 if (rv == 0) /* address already there is an error */ 1972 goto done; 1973 for (j=psl->sl_count-1; j>=i; j--) 1974 psl->sl_addr[j+1] = psl->sl_addr[j]; 1975 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1976 psl->sl_count++; 1977 err = 0; 1978 /* update the interface list */ 1979 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1980 &mreqs->imr_sourceaddr, 1); 1981 done: 1982 rtnl_unlock(); 1983 if (leavegroup) 1984 return ip_mc_leave_group(sk, &imr); 1985 return err; 1986 } 1987 1988 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1989 { 1990 int err = 0; 1991 struct ip_mreqn imr; 1992 __be32 addr = msf->imsf_multiaddr; 1993 struct ip_mc_socklist *pmc; 1994 struct in_device *in_dev; 1995 struct inet_sock *inet = inet_sk(sk); 1996 struct ip_sf_socklist *newpsl, *psl; 1997 int leavegroup = 0; 1998 1999 if (!MULTICAST(addr)) 2000 return -EINVAL; 2001 if (msf->imsf_fmode != MCAST_INCLUDE && 2002 msf->imsf_fmode != MCAST_EXCLUDE) 2003 return -EINVAL; 2004 2005 rtnl_lock(); 2006 2007 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2008 imr.imr_address.s_addr = msf->imsf_interface; 2009 imr.imr_ifindex = ifindex; 2010 in_dev = ip_mc_find_dev(&imr); 2011 2012 if (!in_dev) { 2013 err = -ENODEV; 2014 goto done; 2015 } 2016 2017 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2018 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2019 leavegroup = 1; 2020 goto done; 2021 } 2022 2023 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2024 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2025 pmc->multi.imr_ifindex == imr.imr_ifindex) 2026 break; 2027 } 2028 if (!pmc) { /* must have a prior join */ 2029 err = -EINVAL; 2030 goto done; 2031 } 2032 if (msf->imsf_numsrc) { 2033 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2034 GFP_KERNEL); 2035 if (!newpsl) { 2036 err = -ENOBUFS; 2037 goto done; 2038 } 2039 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2040 memcpy(newpsl->sl_addr, msf->imsf_slist, 2041 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2042 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2043 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2044 if (err) { 2045 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2046 goto done; 2047 } 2048 } else { 2049 newpsl = NULL; 2050 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2051 msf->imsf_fmode, 0, NULL, 0); 2052 } 2053 psl = pmc->sflist; 2054 if (psl) { 2055 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2056 psl->sl_count, psl->sl_addr, 0); 2057 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2058 } else 2059 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2060 0, NULL, 0); 2061 pmc->sflist = newpsl; 2062 pmc->sfmode = msf->imsf_fmode; 2063 err = 0; 2064 done: 2065 rtnl_unlock(); 2066 if (leavegroup) 2067 err = ip_mc_leave_group(sk, &imr); 2068 return err; 2069 } 2070 2071 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2072 struct ip_msfilter __user *optval, int __user *optlen) 2073 { 2074 int err, len, count, copycount; 2075 struct ip_mreqn imr; 2076 __be32 addr = msf->imsf_multiaddr; 2077 struct ip_mc_socklist *pmc; 2078 struct in_device *in_dev; 2079 struct inet_sock *inet = inet_sk(sk); 2080 struct ip_sf_socklist *psl; 2081 2082 if (!MULTICAST(addr)) 2083 return -EINVAL; 2084 2085 rtnl_lock(); 2086 2087 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2088 imr.imr_address.s_addr = msf->imsf_interface; 2089 imr.imr_ifindex = 0; 2090 in_dev = ip_mc_find_dev(&imr); 2091 2092 if (!in_dev) { 2093 err = -ENODEV; 2094 goto done; 2095 } 2096 err = -EADDRNOTAVAIL; 2097 2098 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2099 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2100 pmc->multi.imr_ifindex == imr.imr_ifindex) 2101 break; 2102 } 2103 if (!pmc) /* must have a prior join */ 2104 goto done; 2105 msf->imsf_fmode = pmc->sfmode; 2106 psl = pmc->sflist; 2107 rtnl_unlock(); 2108 if (!psl) { 2109 len = 0; 2110 count = 0; 2111 } else { 2112 count = psl->sl_count; 2113 } 2114 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2115 len = copycount * sizeof(psl->sl_addr[0]); 2116 msf->imsf_numsrc = count; 2117 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2118 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2119 return -EFAULT; 2120 } 2121 if (len && 2122 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2123 return -EFAULT; 2124 return 0; 2125 done: 2126 rtnl_unlock(); 2127 return err; 2128 } 2129 2130 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2131 struct group_filter __user *optval, int __user *optlen) 2132 { 2133 int err, i, count, copycount; 2134 struct sockaddr_in *psin; 2135 __be32 addr; 2136 struct ip_mc_socklist *pmc; 2137 struct inet_sock *inet = inet_sk(sk); 2138 struct ip_sf_socklist *psl; 2139 2140 psin = (struct sockaddr_in *)&gsf->gf_group; 2141 if (psin->sin_family != AF_INET) 2142 return -EINVAL; 2143 addr = psin->sin_addr.s_addr; 2144 if (!MULTICAST(addr)) 2145 return -EINVAL; 2146 2147 rtnl_lock(); 2148 2149 err = -EADDRNOTAVAIL; 2150 2151 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2152 if (pmc->multi.imr_multiaddr.s_addr == addr && 2153 pmc->multi.imr_ifindex == gsf->gf_interface) 2154 break; 2155 } 2156 if (!pmc) /* must have a prior join */ 2157 goto done; 2158 gsf->gf_fmode = pmc->sfmode; 2159 psl = pmc->sflist; 2160 rtnl_unlock(); 2161 count = psl ? psl->sl_count : 0; 2162 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2163 gsf->gf_numsrc = count; 2164 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2165 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2166 return -EFAULT; 2167 } 2168 for (i=0; i<copycount; i++) { 2169 struct sockaddr_in *psin; 2170 struct sockaddr_storage ss; 2171 2172 psin = (struct sockaddr_in *)&ss; 2173 memset(&ss, 0, sizeof(ss)); 2174 psin->sin_family = AF_INET; 2175 psin->sin_addr.s_addr = psl->sl_addr[i]; 2176 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2177 return -EFAULT; 2178 } 2179 return 0; 2180 done: 2181 rtnl_unlock(); 2182 return err; 2183 } 2184 2185 /* 2186 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2187 */ 2188 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2189 { 2190 struct inet_sock *inet = inet_sk(sk); 2191 struct ip_mc_socklist *pmc; 2192 struct ip_sf_socklist *psl; 2193 int i; 2194 2195 if (!MULTICAST(loc_addr)) 2196 return 1; 2197 2198 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2199 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2200 pmc->multi.imr_ifindex == dif) 2201 break; 2202 } 2203 if (!pmc) 2204 return 1; 2205 psl = pmc->sflist; 2206 if (!psl) 2207 return pmc->sfmode == MCAST_EXCLUDE; 2208 2209 for (i=0; i<psl->sl_count; i++) { 2210 if (psl->sl_addr[i] == rmt_addr) 2211 break; 2212 } 2213 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2214 return 0; 2215 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2216 return 0; 2217 return 1; 2218 } 2219 2220 /* 2221 * A socket is closing. 2222 */ 2223 2224 void ip_mc_drop_socket(struct sock *sk) 2225 { 2226 struct inet_sock *inet = inet_sk(sk); 2227 struct ip_mc_socklist *iml; 2228 2229 if (inet->mc_list == NULL) 2230 return; 2231 2232 rtnl_lock(); 2233 while ((iml = inet->mc_list) != NULL) { 2234 struct in_device *in_dev; 2235 inet->mc_list = iml->next; 2236 2237 in_dev = inetdev_by_index(iml->multi.imr_ifindex); 2238 (void) ip_mc_leave_src(sk, iml, in_dev); 2239 if (in_dev != NULL) { 2240 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2241 in_dev_put(in_dev); 2242 } 2243 sock_kfree_s(sk, iml, sizeof(*iml)); 2244 } 2245 rtnl_unlock(); 2246 } 2247 2248 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2249 { 2250 struct ip_mc_list *im; 2251 struct ip_sf_list *psf; 2252 int rv = 0; 2253 2254 read_lock(&in_dev->mc_list_lock); 2255 for (im=in_dev->mc_list; im; im=im->next) { 2256 if (im->multiaddr == mc_addr) 2257 break; 2258 } 2259 if (im && proto == IPPROTO_IGMP) { 2260 rv = 1; 2261 } else if (im) { 2262 if (src_addr) { 2263 for (psf=im->sources; psf; psf=psf->sf_next) { 2264 if (psf->sf_inaddr == src_addr) 2265 break; 2266 } 2267 if (psf) 2268 rv = psf->sf_count[MCAST_INCLUDE] || 2269 psf->sf_count[MCAST_EXCLUDE] != 2270 im->sfcount[MCAST_EXCLUDE]; 2271 else 2272 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2273 } else 2274 rv = 1; /* unspecified source; tentatively allow */ 2275 } 2276 read_unlock(&in_dev->mc_list_lock); 2277 return rv; 2278 } 2279 2280 #if defined(CONFIG_PROC_FS) 2281 struct igmp_mc_iter_state { 2282 struct net_device *dev; 2283 struct in_device *in_dev; 2284 }; 2285 2286 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2287 2288 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2289 { 2290 struct ip_mc_list *im = NULL; 2291 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2292 2293 state->in_dev = NULL; 2294 for_each_netdev(state->dev) { 2295 struct in_device *in_dev; 2296 in_dev = in_dev_get(state->dev); 2297 if (!in_dev) 2298 continue; 2299 read_lock(&in_dev->mc_list_lock); 2300 im = in_dev->mc_list; 2301 if (im) { 2302 state->in_dev = in_dev; 2303 break; 2304 } 2305 read_unlock(&in_dev->mc_list_lock); 2306 in_dev_put(in_dev); 2307 } 2308 return im; 2309 } 2310 2311 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2312 { 2313 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2314 im = im->next; 2315 while (!im) { 2316 if (likely(state->in_dev != NULL)) { 2317 read_unlock(&state->in_dev->mc_list_lock); 2318 in_dev_put(state->in_dev); 2319 } 2320 state->dev = next_net_device(state->dev); 2321 if (!state->dev) { 2322 state->in_dev = NULL; 2323 break; 2324 } 2325 state->in_dev = in_dev_get(state->dev); 2326 if (!state->in_dev) 2327 continue; 2328 read_lock(&state->in_dev->mc_list_lock); 2329 im = state->in_dev->mc_list; 2330 } 2331 return im; 2332 } 2333 2334 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2335 { 2336 struct ip_mc_list *im = igmp_mc_get_first(seq); 2337 if (im) 2338 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2339 --pos; 2340 return pos ? NULL : im; 2341 } 2342 2343 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2344 { 2345 read_lock(&dev_base_lock); 2346 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2347 } 2348 2349 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2350 { 2351 struct ip_mc_list *im; 2352 if (v == SEQ_START_TOKEN) 2353 im = igmp_mc_get_first(seq); 2354 else 2355 im = igmp_mc_get_next(seq, v); 2356 ++*pos; 2357 return im; 2358 } 2359 2360 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 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 2372 static 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->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 2404 static 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 2411 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2412 { 2413 struct seq_file *seq; 2414 int rc = -ENOMEM; 2415 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2416 2417 if (!s) 2418 goto out; 2419 rc = seq_open(file, &igmp_mc_seq_ops); 2420 if (rc) 2421 goto out_kfree; 2422 2423 seq = file->private_data; 2424 seq->private = s; 2425 out: 2426 return rc; 2427 out_kfree: 2428 kfree(s); 2429 goto out; 2430 } 2431 2432 static const struct file_operations igmp_mc_seq_fops = { 2433 .owner = THIS_MODULE, 2434 .open = igmp_mc_seq_open, 2435 .read = seq_read, 2436 .llseek = seq_lseek, 2437 .release = seq_release_private, 2438 }; 2439 2440 struct igmp_mcf_iter_state { 2441 struct net_device *dev; 2442 struct in_device *idev; 2443 struct ip_mc_list *im; 2444 }; 2445 2446 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2447 2448 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2449 { 2450 struct ip_sf_list *psf = NULL; 2451 struct ip_mc_list *im = NULL; 2452 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2453 2454 state->idev = NULL; 2455 state->im = NULL; 2456 for_each_netdev(state->dev) { 2457 struct in_device *idev; 2458 idev = in_dev_get(state->dev); 2459 if (unlikely(idev == NULL)) 2460 continue; 2461 read_lock(&idev->mc_list_lock); 2462 im = idev->mc_list; 2463 if (likely(im != NULL)) { 2464 spin_lock_bh(&im->lock); 2465 psf = im->sources; 2466 if (likely(psf != NULL)) { 2467 state->im = im; 2468 state->idev = idev; 2469 break; 2470 } 2471 spin_unlock_bh(&im->lock); 2472 } 2473 read_unlock(&idev->mc_list_lock); 2474 in_dev_put(idev); 2475 } 2476 return psf; 2477 } 2478 2479 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2480 { 2481 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2482 2483 psf = psf->sf_next; 2484 while (!psf) { 2485 spin_unlock_bh(&state->im->lock); 2486 state->im = state->im->next; 2487 while (!state->im) { 2488 if (likely(state->idev != NULL)) { 2489 read_unlock(&state->idev->mc_list_lock); 2490 in_dev_put(state->idev); 2491 } 2492 state->dev = next_net_device(state->dev); 2493 if (!state->dev) { 2494 state->idev = NULL; 2495 goto out; 2496 } 2497 state->idev = in_dev_get(state->dev); 2498 if (!state->idev) 2499 continue; 2500 read_lock(&state->idev->mc_list_lock); 2501 state->im = state->idev->mc_list; 2502 } 2503 if (!state->im) 2504 break; 2505 spin_lock_bh(&state->im->lock); 2506 psf = state->im->sources; 2507 } 2508 out: 2509 return psf; 2510 } 2511 2512 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2513 { 2514 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2515 if (psf) 2516 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2517 --pos; 2518 return pos ? NULL : psf; 2519 } 2520 2521 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2522 { 2523 read_lock(&dev_base_lock); 2524 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2525 } 2526 2527 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2528 { 2529 struct ip_sf_list *psf; 2530 if (v == SEQ_START_TOKEN) 2531 psf = igmp_mcf_get_first(seq); 2532 else 2533 psf = igmp_mcf_get_next(seq, v); 2534 ++*pos; 2535 return psf; 2536 } 2537 2538 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2539 { 2540 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2541 if (likely(state->im != NULL)) { 2542 spin_unlock_bh(&state->im->lock); 2543 state->im = NULL; 2544 } 2545 if (likely(state->idev != NULL)) { 2546 read_unlock(&state->idev->mc_list_lock); 2547 in_dev_put(state->idev); 2548 state->idev = NULL; 2549 } 2550 state->dev = NULL; 2551 read_unlock(&dev_base_lock); 2552 } 2553 2554 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2555 { 2556 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2557 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2558 2559 if (v == SEQ_START_TOKEN) { 2560 seq_printf(seq, 2561 "%3s %6s " 2562 "%10s %10s %6s %6s\n", "Idx", 2563 "Device", "MCA", 2564 "SRC", "INC", "EXC"); 2565 } else { 2566 seq_printf(seq, 2567 "%3d %6.6s 0x%08x " 2568 "0x%08x %6lu %6lu\n", 2569 state->dev->ifindex, state->dev->name, 2570 ntohl(state->im->multiaddr), 2571 ntohl(psf->sf_inaddr), 2572 psf->sf_count[MCAST_INCLUDE], 2573 psf->sf_count[MCAST_EXCLUDE]); 2574 } 2575 return 0; 2576 } 2577 2578 static const struct seq_operations igmp_mcf_seq_ops = { 2579 .start = igmp_mcf_seq_start, 2580 .next = igmp_mcf_seq_next, 2581 .stop = igmp_mcf_seq_stop, 2582 .show = igmp_mcf_seq_show, 2583 }; 2584 2585 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2586 { 2587 struct seq_file *seq; 2588 int rc = -ENOMEM; 2589 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2590 2591 if (!s) 2592 goto out; 2593 rc = seq_open(file, &igmp_mcf_seq_ops); 2594 if (rc) 2595 goto out_kfree; 2596 2597 seq = file->private_data; 2598 seq->private = s; 2599 out: 2600 return rc; 2601 out_kfree: 2602 kfree(s); 2603 goto out; 2604 } 2605 2606 static const struct file_operations igmp_mcf_seq_fops = { 2607 .owner = THIS_MODULE, 2608 .open = igmp_mcf_seq_open, 2609 .read = seq_read, 2610 .llseek = seq_lseek, 2611 .release = seq_release_private, 2612 }; 2613 2614 int __init igmp_mc_proc_init(void) 2615 { 2616 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); 2617 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2618 return 0; 2619 } 2620 #endif 2621 2622 EXPORT_SYMBOL(ip_mc_dec_group); 2623 EXPORT_SYMBOL(ip_mc_inc_group); 2624 EXPORT_SYMBOL(ip_mc_join_group); 2625 EXPORT_SYMBOL(ip_mc_rejoin_group); 2626