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/net_namespace.h> 95 #include <net/arp.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/route.h> 99 #include <net/sock.h> 100 #include <net/checksum.h> 101 #include <linux/netfilter_ipv4.h> 102 #ifdef CONFIG_IP_MROUTE 103 #include <linux/mroute.h> 104 #endif 105 #ifdef CONFIG_PROC_FS 106 #include <linux/proc_fs.h> 107 #include <linux/seq_file.h> 108 #endif 109 110 #define IP_MAX_MEMBERSHIPS 20 111 #define IP_MAX_MSF 10 112 113 #ifdef CONFIG_IP_MULTICAST 114 /* Parameter names and values are taken from igmp-v2-06 draft */ 115 116 #define IGMP_V1_Router_Present_Timeout (400*HZ) 117 #define IGMP_V2_Router_Present_Timeout (400*HZ) 118 #define IGMP_Unsolicited_Report_Interval (10*HZ) 119 #define IGMP_Query_Response_Interval (10*HZ) 120 #define IGMP_Unsolicited_Report_Count 2 121 122 123 #define IGMP_Initial_Report_Delay (1) 124 125 /* IGMP_Initial_Report_Delay is not from IGMP specs! 126 * IGMP specs require to report membership immediately after 127 * joining a group, but we delay the first report by a 128 * small interval. It seems more natural and still does not 129 * contradict to specs provided this delay is small enough. 130 */ 131 132 #define IGMP_V1_SEEN(in_dev) \ 133 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 135 ((in_dev)->mr_v1_seen && \ 136 time_before(jiffies, (in_dev)->mr_v1_seen))) 137 #define IGMP_V2_SEEN(in_dev) \ 138 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 140 ((in_dev)->mr_v2_seen && \ 141 time_before(jiffies, (in_dev)->mr_v2_seen))) 142 143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 145 static void igmpv3_clear_delrec(struct in_device *in_dev); 146 static int sf_setstate(struct ip_mc_list *pmc); 147 static void sf_markstate(struct ip_mc_list *pmc); 148 #endif 149 static void ip_mc_clear_src(struct ip_mc_list *pmc); 150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 151 int sfcount, __be32 *psfsrc, int delta); 152 153 static void ip_ma_put(struct ip_mc_list *im) 154 { 155 if (atomic_dec_and_test(&im->refcnt)) { 156 in_dev_put(im->interface); 157 kfree(im); 158 } 159 } 160 161 #ifdef CONFIG_IP_MULTICAST 162 163 /* 164 * Timer management 165 */ 166 167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 168 { 169 spin_lock_bh(&im->lock); 170 if (del_timer(&im->timer)) 171 atomic_dec(&im->refcnt); 172 im->tm_running=0; 173 im->reporter = 0; 174 im->unsolicit_count = 0; 175 spin_unlock_bh(&im->lock); 176 } 177 178 /* It must be called with locked im->lock */ 179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 180 { 181 int tv=net_random() % max_delay; 182 183 im->tm_running=1; 184 if (!mod_timer(&im->timer, jiffies+tv+2)) 185 atomic_inc(&im->refcnt); 186 } 187 188 static void igmp_gq_start_timer(struct in_device *in_dev) 189 { 190 int tv = net_random() % in_dev->mr_maxdelay; 191 192 in_dev->mr_gq_running = 1; 193 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 194 in_dev_hold(in_dev); 195 } 196 197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 198 { 199 int tv = net_random() % delay; 200 201 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 202 in_dev_hold(in_dev); 203 } 204 205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 206 { 207 spin_lock_bh(&im->lock); 208 im->unsolicit_count = 0; 209 if (del_timer(&im->timer)) { 210 if ((long)(im->timer.expires-jiffies) < max_delay) { 211 add_timer(&im->timer); 212 im->tm_running=1; 213 spin_unlock_bh(&im->lock); 214 return; 215 } 216 atomic_dec(&im->refcnt); 217 } 218 igmp_start_timer(im, max_delay); 219 spin_unlock_bh(&im->lock); 220 } 221 222 223 /* 224 * Send an IGMP report. 225 */ 226 227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 228 229 230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 231 int gdeleted, int sdeleted) 232 { 233 switch (type) { 234 case IGMPV3_MODE_IS_INCLUDE: 235 case IGMPV3_MODE_IS_EXCLUDE: 236 if (gdeleted || sdeleted) 237 return 0; 238 if (!(pmc->gsquery && !psf->sf_gsresp)) { 239 if (pmc->sfmode == MCAST_INCLUDE) 240 return 1; 241 /* don't include if this source is excluded 242 * in all filters 243 */ 244 if (psf->sf_count[MCAST_INCLUDE]) 245 return type == IGMPV3_MODE_IS_INCLUDE; 246 return pmc->sfcount[MCAST_EXCLUDE] == 247 psf->sf_count[MCAST_EXCLUDE]; 248 } 249 return 0; 250 case IGMPV3_CHANGE_TO_INCLUDE: 251 if (gdeleted || sdeleted) 252 return 0; 253 return psf->sf_count[MCAST_INCLUDE] != 0; 254 case IGMPV3_CHANGE_TO_EXCLUDE: 255 if (gdeleted || sdeleted) 256 return 0; 257 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 258 psf->sf_count[MCAST_INCLUDE]) 259 return 0; 260 return pmc->sfcount[MCAST_EXCLUDE] == 261 psf->sf_count[MCAST_EXCLUDE]; 262 case IGMPV3_ALLOW_NEW_SOURCES: 263 if (gdeleted || !psf->sf_crcount) 264 return 0; 265 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 266 case IGMPV3_BLOCK_OLD_SOURCES: 267 if (pmc->sfmode == MCAST_INCLUDE) 268 return gdeleted || (psf->sf_crcount && sdeleted); 269 return psf->sf_crcount && !gdeleted && !sdeleted; 270 } 271 return 0; 272 } 273 274 static int 275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 276 { 277 struct ip_sf_list *psf; 278 int scount = 0; 279 280 for (psf=pmc->sources; psf; psf=psf->sf_next) { 281 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 282 continue; 283 scount++; 284 } 285 return scount; 286 } 287 288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 289 { 290 struct sk_buff *skb; 291 struct rtable *rt; 292 struct iphdr *pip; 293 struct igmpv3_report *pig; 294 295 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); 296 if (skb == NULL) 297 return NULL; 298 299 { 300 struct flowi fl = { .oif = dev->ifindex, 301 .nl_u = { .ip4_u = { 302 .daddr = IGMPV3_ALL_MCR } }, 303 .proto = IPPROTO_IGMP }; 304 if (ip_route_output_key(&init_net, &rt, &fl)) { 305 kfree_skb(skb); 306 return NULL; 307 } 308 } 309 if (rt->rt_src == 0) { 310 kfree_skb(skb); 311 ip_rt_put(rt); 312 return NULL; 313 } 314 315 skb->dst = &rt->u.dst; 316 skb->dev = dev; 317 318 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 319 320 skb_reset_network_header(skb); 321 pip = ip_hdr(skb); 322 skb_put(skb, sizeof(struct iphdr) + 4); 323 324 pip->version = 4; 325 pip->ihl = (sizeof(struct iphdr)+4)>>2; 326 pip->tos = 0xc0; 327 pip->frag_off = htons(IP_DF); 328 pip->ttl = 1; 329 pip->daddr = rt->rt_dst; 330 pip->saddr = rt->rt_src; 331 pip->protocol = IPPROTO_IGMP; 332 pip->tot_len = 0; /* filled in later */ 333 ip_select_ident(pip, &rt->u.dst, NULL); 334 ((u8*)&pip[1])[0] = IPOPT_RA; 335 ((u8*)&pip[1])[1] = 4; 336 ((u8*)&pip[1])[2] = 0; 337 ((u8*)&pip[1])[3] = 0; 338 339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 340 skb_put(skb, sizeof(*pig)); 341 pig = igmpv3_report_hdr(skb); 342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 343 pig->resv1 = 0; 344 pig->csum = 0; 345 pig->resv2 = 0; 346 pig->ngrec = 0; 347 return skb; 348 } 349 350 static int igmpv3_sendpack(struct sk_buff *skb) 351 { 352 struct igmphdr *pig = igmp_hdr(skb); 353 const int igmplen = skb->tail - skb->transport_header; 354 355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 356 357 return ip_local_out(skb); 358 } 359 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 361 { 362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 363 } 364 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 366 int type, struct igmpv3_grec **ppgr) 367 { 368 struct net_device *dev = pmc->interface->dev; 369 struct igmpv3_report *pih; 370 struct igmpv3_grec *pgr; 371 372 if (!skb) 373 skb = igmpv3_newpack(dev, dev->mtu); 374 if (!skb) 375 return NULL; 376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 377 pgr->grec_type = type; 378 pgr->grec_auxwords = 0; 379 pgr->grec_nsrcs = 0; 380 pgr->grec_mca = pmc->multiaddr; 381 pih = igmpv3_report_hdr(skb); 382 pih->ngrec = htons(ntohs(pih->ngrec)+1); 383 *ppgr = pgr; 384 return skb; 385 } 386 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 388 skb_tailroom(skb)) : 0) 389 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 391 int type, int gdeleted, int sdeleted) 392 { 393 struct net_device *dev = pmc->interface->dev; 394 struct igmpv3_report *pih; 395 struct igmpv3_grec *pgr = NULL; 396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 397 int scount, stotal, first, isquery, truncate; 398 399 if (pmc->multiaddr == IGMP_ALL_HOSTS) 400 return skb; 401 402 isquery = type == IGMPV3_MODE_IS_INCLUDE || 403 type == IGMPV3_MODE_IS_EXCLUDE; 404 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 405 type == IGMPV3_CHANGE_TO_EXCLUDE; 406 407 stotal = scount = 0; 408 409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 410 411 if (!*psf_list) 412 goto empty_source; 413 414 pih = skb ? igmpv3_report_hdr(skb) : NULL; 415 416 /* EX and TO_EX get a fresh packet, if needed */ 417 if (truncate) { 418 if (pih && pih->ngrec && 419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 420 if (skb) 421 igmpv3_sendpack(skb); 422 skb = igmpv3_newpack(dev, dev->mtu); 423 } 424 } 425 first = 1; 426 psf_prev = NULL; 427 for (psf=*psf_list; psf; psf=psf_next) { 428 __be32 *psrc; 429 430 psf_next = psf->sf_next; 431 432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 433 psf_prev = psf; 434 continue; 435 } 436 437 /* clear marks on query responses */ 438 if (isquery) 439 psf->sf_gsresp = 0; 440 441 if (AVAILABLE(skb) < sizeof(__be32) + 442 first*sizeof(struct igmpv3_grec)) { 443 if (truncate && !first) 444 break; /* truncate these */ 445 if (pgr) 446 pgr->grec_nsrcs = htons(scount); 447 if (skb) 448 igmpv3_sendpack(skb); 449 skb = igmpv3_newpack(dev, dev->mtu); 450 first = 1; 451 scount = 0; 452 } 453 if (first) { 454 skb = add_grhead(skb, pmc, type, &pgr); 455 first = 0; 456 } 457 if (!skb) 458 return NULL; 459 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 460 *psrc = psf->sf_inaddr; 461 scount++; stotal++; 462 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 464 psf->sf_crcount--; 465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 466 if (psf_prev) 467 psf_prev->sf_next = psf->sf_next; 468 else 469 *psf_list = psf->sf_next; 470 kfree(psf); 471 continue; 472 } 473 } 474 psf_prev = psf; 475 } 476 477 empty_source: 478 if (!stotal) { 479 if (type == IGMPV3_ALLOW_NEW_SOURCES || 480 type == IGMPV3_BLOCK_OLD_SOURCES) 481 return skb; 482 if (pmc->crcount || isquery) { 483 /* make sure we have room for group header */ 484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 485 igmpv3_sendpack(skb); 486 skb = NULL; /* add_grhead will get a new one */ 487 } 488 skb = add_grhead(skb, pmc, type, &pgr); 489 } 490 } 491 if (pgr) 492 pgr->grec_nsrcs = htons(scount); 493 494 if (isquery) 495 pmc->gsquery = 0; /* clear query state on report */ 496 return skb; 497 } 498 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 500 { 501 struct sk_buff *skb = NULL; 502 int type; 503 504 if (!pmc) { 505 read_lock(&in_dev->mc_list_lock); 506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 507 if (pmc->multiaddr == IGMP_ALL_HOSTS) 508 continue; 509 spin_lock_bh(&pmc->lock); 510 if (pmc->sfcount[MCAST_EXCLUDE]) 511 type = IGMPV3_MODE_IS_EXCLUDE; 512 else 513 type = IGMPV3_MODE_IS_INCLUDE; 514 skb = add_grec(skb, pmc, type, 0, 0); 515 spin_unlock_bh(&pmc->lock); 516 } 517 read_unlock(&in_dev->mc_list_lock); 518 } else { 519 spin_lock_bh(&pmc->lock); 520 if (pmc->sfcount[MCAST_EXCLUDE]) 521 type = IGMPV3_MODE_IS_EXCLUDE; 522 else 523 type = IGMPV3_MODE_IS_INCLUDE; 524 skb = add_grec(skb, pmc, type, 0, 0); 525 spin_unlock_bh(&pmc->lock); 526 } 527 if (!skb) 528 return 0; 529 return igmpv3_sendpack(skb); 530 } 531 532 /* 533 * remove zero-count source records from a source filter list 534 */ 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 536 { 537 struct ip_sf_list *psf_prev, *psf_next, *psf; 538 539 psf_prev = NULL; 540 for (psf=*ppsf; psf; psf = psf_next) { 541 psf_next = psf->sf_next; 542 if (psf->sf_crcount == 0) { 543 if (psf_prev) 544 psf_prev->sf_next = psf->sf_next; 545 else 546 *ppsf = psf->sf_next; 547 kfree(psf); 548 } else 549 psf_prev = psf; 550 } 551 } 552 553 static void igmpv3_send_cr(struct in_device *in_dev) 554 { 555 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 556 struct sk_buff *skb = NULL; 557 int type, dtype; 558 559 read_lock(&in_dev->mc_list_lock); 560 spin_lock_bh(&in_dev->mc_tomb_lock); 561 562 /* deleted MCA's */ 563 pmc_prev = NULL; 564 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 565 pmc_next = pmc->next; 566 if (pmc->sfmode == MCAST_INCLUDE) { 567 type = IGMPV3_BLOCK_OLD_SOURCES; 568 dtype = IGMPV3_BLOCK_OLD_SOURCES; 569 skb = add_grec(skb, pmc, type, 1, 0); 570 skb = add_grec(skb, pmc, dtype, 1, 1); 571 } 572 if (pmc->crcount) { 573 if (pmc->sfmode == MCAST_EXCLUDE) { 574 type = IGMPV3_CHANGE_TO_INCLUDE; 575 skb = add_grec(skb, pmc, type, 1, 0); 576 } 577 pmc->crcount--; 578 if (pmc->crcount == 0) { 579 igmpv3_clear_zeros(&pmc->tomb); 580 igmpv3_clear_zeros(&pmc->sources); 581 } 582 } 583 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 584 if (pmc_prev) 585 pmc_prev->next = pmc_next; 586 else 587 in_dev->mc_tomb = pmc_next; 588 in_dev_put(pmc->interface); 589 kfree(pmc); 590 } else 591 pmc_prev = pmc; 592 } 593 spin_unlock_bh(&in_dev->mc_tomb_lock); 594 595 /* change recs */ 596 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 597 spin_lock_bh(&pmc->lock); 598 if (pmc->sfcount[MCAST_EXCLUDE]) { 599 type = IGMPV3_BLOCK_OLD_SOURCES; 600 dtype = IGMPV3_ALLOW_NEW_SOURCES; 601 } else { 602 type = IGMPV3_ALLOW_NEW_SOURCES; 603 dtype = IGMPV3_BLOCK_OLD_SOURCES; 604 } 605 skb = add_grec(skb, pmc, type, 0, 0); 606 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 607 608 /* filter mode changes */ 609 if (pmc->crcount) { 610 if (pmc->sfmode == MCAST_EXCLUDE) 611 type = IGMPV3_CHANGE_TO_EXCLUDE; 612 else 613 type = IGMPV3_CHANGE_TO_INCLUDE; 614 skb = add_grec(skb, pmc, type, 0, 0); 615 pmc->crcount--; 616 } 617 spin_unlock_bh(&pmc->lock); 618 } 619 read_unlock(&in_dev->mc_list_lock); 620 621 if (!skb) 622 return; 623 (void) igmpv3_sendpack(skb); 624 } 625 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 627 int type) 628 { 629 struct sk_buff *skb; 630 struct iphdr *iph; 631 struct igmphdr *ih; 632 struct rtable *rt; 633 struct net_device *dev = in_dev->dev; 634 __be32 group = pmc ? pmc->multiaddr : 0; 635 __be32 dst; 636 637 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 638 return igmpv3_send_report(in_dev, pmc); 639 else if (type == IGMP_HOST_LEAVE_MESSAGE) 640 dst = IGMP_ALL_ROUTER; 641 else 642 dst = group; 643 644 { 645 struct flowi fl = { .oif = dev->ifindex, 646 .nl_u = { .ip4_u = { .daddr = dst } }, 647 .proto = IPPROTO_IGMP }; 648 if (ip_route_output_key(&init_net, &rt, &fl)) 649 return -1; 650 } 651 if (rt->rt_src == 0) { 652 ip_rt_put(rt); 653 return -1; 654 } 655 656 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 657 if (skb == NULL) { 658 ip_rt_put(rt); 659 return -1; 660 } 661 662 skb->dst = &rt->u.dst; 663 664 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 665 666 skb_reset_network_header(skb); 667 iph = ip_hdr(skb); 668 skb_put(skb, sizeof(struct iphdr) + 4); 669 670 iph->version = 4; 671 iph->ihl = (sizeof(struct iphdr)+4)>>2; 672 iph->tos = 0xc0; 673 iph->frag_off = htons(IP_DF); 674 iph->ttl = 1; 675 iph->daddr = dst; 676 iph->saddr = rt->rt_src; 677 iph->protocol = IPPROTO_IGMP; 678 ip_select_ident(iph, &rt->u.dst, NULL); 679 ((u8*)&iph[1])[0] = IPOPT_RA; 680 ((u8*)&iph[1])[1] = 4; 681 ((u8*)&iph[1])[2] = 0; 682 ((u8*)&iph[1])[3] = 0; 683 684 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 685 ih->type=type; 686 ih->code=0; 687 ih->csum=0; 688 ih->group=group; 689 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 690 691 return ip_local_out(skb); 692 } 693 694 static void igmp_gq_timer_expire(unsigned long data) 695 { 696 struct in_device *in_dev = (struct in_device *)data; 697 698 in_dev->mr_gq_running = 0; 699 igmpv3_send_report(in_dev, NULL); 700 __in_dev_put(in_dev); 701 } 702 703 static void igmp_ifc_timer_expire(unsigned long data) 704 { 705 struct in_device *in_dev = (struct in_device *)data; 706 707 igmpv3_send_cr(in_dev); 708 if (in_dev->mr_ifc_count) { 709 in_dev->mr_ifc_count--; 710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 711 } 712 __in_dev_put(in_dev); 713 } 714 715 static void igmp_ifc_event(struct in_device *in_dev) 716 { 717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 718 return; 719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 720 IGMP_Unsolicited_Report_Count; 721 igmp_ifc_start_timer(in_dev, 1); 722 } 723 724 725 static void igmp_timer_expire(unsigned long data) 726 { 727 struct ip_mc_list *im=(struct ip_mc_list *)data; 728 struct in_device *in_dev = im->interface; 729 730 spin_lock(&im->lock); 731 im->tm_running=0; 732 733 if (im->unsolicit_count) { 734 im->unsolicit_count--; 735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 736 } 737 im->reporter = 1; 738 spin_unlock(&im->lock); 739 740 if (IGMP_V1_SEEN(in_dev)) 741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 742 else if (IGMP_V2_SEEN(in_dev)) 743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 744 else 745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 746 747 ip_ma_put(im); 748 } 749 750 /* mark EXCLUDE-mode sources */ 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 752 { 753 struct ip_sf_list *psf; 754 int i, scount; 755 756 scount = 0; 757 for (psf=pmc->sources; psf; psf=psf->sf_next) { 758 if (scount == nsrcs) 759 break; 760 for (i=0; i<nsrcs; i++) { 761 /* skip inactive filters */ 762 if (pmc->sfcount[MCAST_INCLUDE] || 763 pmc->sfcount[MCAST_EXCLUDE] != 764 psf->sf_count[MCAST_EXCLUDE]) 765 continue; 766 if (srcs[i] == psf->sf_inaddr) { 767 scount++; 768 break; 769 } 770 } 771 } 772 pmc->gsquery = 0; 773 if (scount == nsrcs) /* all sources excluded */ 774 return 0; 775 return 1; 776 } 777 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 779 { 780 struct ip_sf_list *psf; 781 int i, scount; 782 783 if (pmc->sfmode == MCAST_EXCLUDE) 784 return igmp_xmarksources(pmc, nsrcs, srcs); 785 786 /* mark INCLUDE-mode sources */ 787 scount = 0; 788 for (psf=pmc->sources; psf; psf=psf->sf_next) { 789 if (scount == nsrcs) 790 break; 791 for (i=0; i<nsrcs; i++) 792 if (srcs[i] == psf->sf_inaddr) { 793 psf->sf_gsresp = 1; 794 scount++; 795 break; 796 } 797 } 798 if (!scount) { 799 pmc->gsquery = 0; 800 return 0; 801 } 802 pmc->gsquery = 1; 803 return 1; 804 } 805 806 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 807 { 808 struct ip_mc_list *im; 809 810 /* Timers are only set for non-local groups */ 811 812 if (group == IGMP_ALL_HOSTS) 813 return; 814 815 read_lock(&in_dev->mc_list_lock); 816 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 817 if (im->multiaddr == group) { 818 igmp_stop_timer(im); 819 break; 820 } 821 } 822 read_unlock(&in_dev->mc_list_lock); 823 } 824 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 826 int len) 827 { 828 struct igmphdr *ih = igmp_hdr(skb); 829 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 830 struct ip_mc_list *im; 831 __be32 group = ih->group; 832 int max_delay; 833 int mark = 0; 834 835 836 if (len == 8) { 837 if (ih->code == 0) { 838 /* Alas, old v1 router presents here. */ 839 840 max_delay = IGMP_Query_Response_Interval; 841 in_dev->mr_v1_seen = jiffies + 842 IGMP_V1_Router_Present_Timeout; 843 group = 0; 844 } else { 845 /* v2 router present */ 846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 847 in_dev->mr_v2_seen = jiffies + 848 IGMP_V2_Router_Present_Timeout; 849 } 850 /* cancel the interface change timer */ 851 in_dev->mr_ifc_count = 0; 852 if (del_timer(&in_dev->mr_ifc_timer)) 853 __in_dev_put(in_dev); 854 /* clear deleted report items */ 855 igmpv3_clear_delrec(in_dev); 856 } else if (len < 12) { 857 return; /* ignore bogus packet; freed by caller */ 858 } else { /* v3 */ 859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 860 return; 861 862 ih3 = igmpv3_query_hdr(skb); 863 if (ih3->nsrcs) { 864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 865 + ntohs(ih3->nsrcs)*sizeof(__be32))) 866 return; 867 ih3 = igmpv3_query_hdr(skb); 868 } 869 870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 871 if (!max_delay) 872 max_delay = 1; /* can't mod w/ 0 */ 873 in_dev->mr_maxdelay = max_delay; 874 if (ih3->qrv) 875 in_dev->mr_qrv = ih3->qrv; 876 if (!group) { /* general query */ 877 if (ih3->nsrcs) 878 return; /* no sources allowed */ 879 igmp_gq_start_timer(in_dev); 880 return; 881 } 882 /* mark sources to include, if group & source-specific */ 883 mark = ih3->nsrcs != 0; 884 } 885 886 /* 887 * - Start the timers in all of our membership records 888 * that the query applies to for the interface on 889 * which the query arrived excl. those that belong 890 * to a "local" group (224.0.0.X) 891 * - For timers already running check if they need to 892 * be reset. 893 * - Use the igmp->igmp_code field as the maximum 894 * delay possible 895 */ 896 read_lock(&in_dev->mc_list_lock); 897 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 898 int changed; 899 900 if (group && group != im->multiaddr) 901 continue; 902 if (im->multiaddr == IGMP_ALL_HOSTS) 903 continue; 904 spin_lock_bh(&im->lock); 905 if (im->tm_running) 906 im->gsquery = im->gsquery && mark; 907 else 908 im->gsquery = mark; 909 changed = !im->gsquery || 910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 911 spin_unlock_bh(&im->lock); 912 if (changed) 913 igmp_mod_timer(im, max_delay); 914 } 915 read_unlock(&in_dev->mc_list_lock); 916 } 917 918 int igmp_rcv(struct sk_buff *skb) 919 { 920 /* This basically follows the spec line by line -- see RFC1112 */ 921 struct igmphdr *ih; 922 struct in_device *in_dev = in_dev_get(skb->dev); 923 int len = skb->len; 924 925 if (in_dev == NULL) 926 goto drop; 927 928 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 929 goto drop_ref; 930 931 switch (skb->ip_summed) { 932 case CHECKSUM_COMPLETE: 933 if (!csum_fold(skb->csum)) 934 break; 935 /* fall through */ 936 case CHECKSUM_NONE: 937 skb->csum = 0; 938 if (__skb_checksum_complete(skb)) 939 goto drop_ref; 940 } 941 942 ih = igmp_hdr(skb); 943 switch (ih->type) { 944 case IGMP_HOST_MEMBERSHIP_QUERY: 945 igmp_heard_query(in_dev, skb, len); 946 break; 947 case IGMP_HOST_MEMBERSHIP_REPORT: 948 case IGMPV2_HOST_MEMBERSHIP_REPORT: 949 case IGMPV3_HOST_MEMBERSHIP_REPORT: 950 /* Is it our report looped back? */ 951 if (skb->rtable->fl.iif == 0) 952 break; 953 /* don't rely on MC router hearing unicast reports */ 954 if (skb->pkt_type == PACKET_MULTICAST || 955 skb->pkt_type == PACKET_BROADCAST) 956 igmp_heard_report(in_dev, ih->group); 957 break; 958 case IGMP_PIM: 959 #ifdef CONFIG_IP_PIMSM_V1 960 in_dev_put(in_dev); 961 return pim_rcv_v1(skb); 962 #endif 963 case IGMP_DVMRP: 964 case IGMP_TRACE: 965 case IGMP_HOST_LEAVE_MESSAGE: 966 case IGMP_MTRACE: 967 case IGMP_MTRACE_RESP: 968 break; 969 default: 970 break; 971 } 972 973 drop_ref: 974 in_dev_put(in_dev); 975 drop: 976 kfree_skb(skb); 977 return 0; 978 } 979 980 #endif 981 982 983 /* 984 * Add a filter to a device 985 */ 986 987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 988 { 989 char buf[MAX_ADDR_LEN]; 990 struct net_device *dev = in_dev->dev; 991 992 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 993 We will get multicast token leakage, when IFF_MULTICAST 994 is changed. This check should be done in dev->set_multicast_list 995 routine. Something sort of: 996 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 997 --ANK 998 */ 999 if (arp_mc_map(addr, buf, dev, 0) == 0) 1000 dev_mc_add(dev,buf,dev->addr_len,0); 1001 } 1002 1003 /* 1004 * Remove a filter from a device 1005 */ 1006 1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1008 { 1009 char buf[MAX_ADDR_LEN]; 1010 struct net_device *dev = in_dev->dev; 1011 1012 if (arp_mc_map(addr, buf, dev, 0) == 0) 1013 dev_mc_delete(dev,buf,dev->addr_len,0); 1014 } 1015 1016 #ifdef CONFIG_IP_MULTICAST 1017 /* 1018 * deleted ip_mc_list manipulation 1019 */ 1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1021 { 1022 struct ip_mc_list *pmc; 1023 1024 /* this is an "ip_mc_list" for convenience; only the fields below 1025 * are actually used. In particular, the refcnt and users are not 1026 * used for management of the delete list. Using the same structure 1027 * for deleted items allows change reports to use common code with 1028 * non-deleted or query-response MCA's. 1029 */ 1030 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1031 if (!pmc) 1032 return; 1033 spin_lock_bh(&im->lock); 1034 pmc->interface = im->interface; 1035 in_dev_hold(in_dev); 1036 pmc->multiaddr = im->multiaddr; 1037 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1038 IGMP_Unsolicited_Report_Count; 1039 pmc->sfmode = im->sfmode; 1040 if (pmc->sfmode == MCAST_INCLUDE) { 1041 struct ip_sf_list *psf; 1042 1043 pmc->tomb = im->tomb; 1044 pmc->sources = im->sources; 1045 im->tomb = im->sources = NULL; 1046 for (psf=pmc->sources; psf; psf=psf->sf_next) 1047 psf->sf_crcount = pmc->crcount; 1048 } 1049 spin_unlock_bh(&im->lock); 1050 1051 spin_lock_bh(&in_dev->mc_tomb_lock); 1052 pmc->next = in_dev->mc_tomb; 1053 in_dev->mc_tomb = pmc; 1054 spin_unlock_bh(&in_dev->mc_tomb_lock); 1055 } 1056 1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1058 { 1059 struct ip_mc_list *pmc, *pmc_prev; 1060 struct ip_sf_list *psf, *psf_next; 1061 1062 spin_lock_bh(&in_dev->mc_tomb_lock); 1063 pmc_prev = NULL; 1064 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1065 if (pmc->multiaddr == multiaddr) 1066 break; 1067 pmc_prev = pmc; 1068 } 1069 if (pmc) { 1070 if (pmc_prev) 1071 pmc_prev->next = pmc->next; 1072 else 1073 in_dev->mc_tomb = pmc->next; 1074 } 1075 spin_unlock_bh(&in_dev->mc_tomb_lock); 1076 if (pmc) { 1077 for (psf=pmc->tomb; psf; psf=psf_next) { 1078 psf_next = psf->sf_next; 1079 kfree(psf); 1080 } 1081 in_dev_put(pmc->interface); 1082 kfree(pmc); 1083 } 1084 } 1085 1086 static void igmpv3_clear_delrec(struct in_device *in_dev) 1087 { 1088 struct ip_mc_list *pmc, *nextpmc; 1089 1090 spin_lock_bh(&in_dev->mc_tomb_lock); 1091 pmc = in_dev->mc_tomb; 1092 in_dev->mc_tomb = NULL; 1093 spin_unlock_bh(&in_dev->mc_tomb_lock); 1094 1095 for (; pmc; pmc = nextpmc) { 1096 nextpmc = pmc->next; 1097 ip_mc_clear_src(pmc); 1098 in_dev_put(pmc->interface); 1099 kfree(pmc); 1100 } 1101 /* clear dead sources, too */ 1102 read_lock(&in_dev->mc_list_lock); 1103 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1104 struct ip_sf_list *psf, *psf_next; 1105 1106 spin_lock_bh(&pmc->lock); 1107 psf = pmc->tomb; 1108 pmc->tomb = NULL; 1109 spin_unlock_bh(&pmc->lock); 1110 for (; psf; psf=psf_next) { 1111 psf_next = psf->sf_next; 1112 kfree(psf); 1113 } 1114 } 1115 read_unlock(&in_dev->mc_list_lock); 1116 } 1117 #endif 1118 1119 static void igmp_group_dropped(struct ip_mc_list *im) 1120 { 1121 struct in_device *in_dev = im->interface; 1122 #ifdef CONFIG_IP_MULTICAST 1123 int reporter; 1124 #endif 1125 1126 if (im->loaded) { 1127 im->loaded = 0; 1128 ip_mc_filter_del(in_dev, im->multiaddr); 1129 } 1130 1131 #ifdef CONFIG_IP_MULTICAST 1132 if (im->multiaddr == IGMP_ALL_HOSTS) 1133 return; 1134 1135 reporter = im->reporter; 1136 igmp_stop_timer(im); 1137 1138 if (!in_dev->dead) { 1139 if (IGMP_V1_SEEN(in_dev)) 1140 goto done; 1141 if (IGMP_V2_SEEN(in_dev)) { 1142 if (reporter) 1143 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1144 goto done; 1145 } 1146 /* IGMPv3 */ 1147 igmpv3_add_delrec(in_dev, im); 1148 1149 igmp_ifc_event(in_dev); 1150 } 1151 done: 1152 #endif 1153 ip_mc_clear_src(im); 1154 } 1155 1156 static void igmp_group_added(struct ip_mc_list *im) 1157 { 1158 struct in_device *in_dev = im->interface; 1159 1160 if (im->loaded == 0) { 1161 im->loaded = 1; 1162 ip_mc_filter_add(in_dev, im->multiaddr); 1163 } 1164 1165 #ifdef CONFIG_IP_MULTICAST 1166 if (im->multiaddr == IGMP_ALL_HOSTS) 1167 return; 1168 1169 if (in_dev->dead) 1170 return; 1171 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1172 spin_lock_bh(&im->lock); 1173 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1174 spin_unlock_bh(&im->lock); 1175 return; 1176 } 1177 /* else, v3 */ 1178 1179 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1180 IGMP_Unsolicited_Report_Count; 1181 igmp_ifc_event(in_dev); 1182 #endif 1183 } 1184 1185 1186 /* 1187 * Multicast list managers 1188 */ 1189 1190 1191 /* 1192 * A socket has joined a multicast group on device dev. 1193 */ 1194 1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1196 { 1197 struct ip_mc_list *im; 1198 1199 ASSERT_RTNL(); 1200 1201 if (dev_net(in_dev->dev) != &init_net) 1202 return; 1203 1204 for (im=in_dev->mc_list; im; im=im->next) { 1205 if (im->multiaddr == addr) { 1206 im->users++; 1207 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1208 goto out; 1209 } 1210 } 1211 1212 im = kmalloc(sizeof(*im), GFP_KERNEL); 1213 if (!im) 1214 goto out; 1215 1216 im->users=1; 1217 im->interface=in_dev; 1218 in_dev_hold(in_dev); 1219 im->multiaddr=addr; 1220 /* initial mode is (EX, empty) */ 1221 im->sfmode = MCAST_EXCLUDE; 1222 im->sfcount[MCAST_INCLUDE] = 0; 1223 im->sfcount[MCAST_EXCLUDE] = 1; 1224 im->sources = NULL; 1225 im->tomb = NULL; 1226 im->crcount = 0; 1227 atomic_set(&im->refcnt, 1); 1228 spin_lock_init(&im->lock); 1229 #ifdef CONFIG_IP_MULTICAST 1230 im->tm_running=0; 1231 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1232 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1233 im->reporter = 0; 1234 im->gsquery = 0; 1235 #endif 1236 im->loaded = 0; 1237 write_lock_bh(&in_dev->mc_list_lock); 1238 im->next=in_dev->mc_list; 1239 in_dev->mc_list=im; 1240 write_unlock_bh(&in_dev->mc_list_lock); 1241 #ifdef CONFIG_IP_MULTICAST 1242 igmpv3_del_delrec(in_dev, im->multiaddr); 1243 #endif 1244 igmp_group_added(im); 1245 if (!in_dev->dead) 1246 ip_rt_multicast_event(in_dev); 1247 out: 1248 return; 1249 } 1250 1251 /* 1252 * Resend IGMP JOIN report; used for bonding. 1253 */ 1254 void ip_mc_rejoin_group(struct ip_mc_list *im) 1255 { 1256 #ifdef CONFIG_IP_MULTICAST 1257 struct in_device *in_dev = im->interface; 1258 1259 if (im->multiaddr == IGMP_ALL_HOSTS) 1260 return; 1261 1262 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1263 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1264 return; 1265 } 1266 /* else, v3 */ 1267 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1268 IGMP_Unsolicited_Report_Count; 1269 igmp_ifc_event(in_dev); 1270 #endif 1271 } 1272 1273 /* 1274 * A socket has left a multicast group on device dev 1275 */ 1276 1277 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1278 { 1279 struct ip_mc_list *i, **ip; 1280 1281 ASSERT_RTNL(); 1282 1283 if (dev_net(in_dev->dev) != &init_net) 1284 return; 1285 1286 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1287 if (i->multiaddr==addr) { 1288 if (--i->users == 0) { 1289 write_lock_bh(&in_dev->mc_list_lock); 1290 *ip = i->next; 1291 write_unlock_bh(&in_dev->mc_list_lock); 1292 igmp_group_dropped(i); 1293 1294 if (!in_dev->dead) 1295 ip_rt_multicast_event(in_dev); 1296 1297 ip_ma_put(i); 1298 return; 1299 } 1300 break; 1301 } 1302 } 1303 } 1304 1305 /* Device going down */ 1306 1307 void ip_mc_down(struct in_device *in_dev) 1308 { 1309 struct ip_mc_list *i; 1310 1311 ASSERT_RTNL(); 1312 1313 if (dev_net(in_dev->dev) != &init_net) 1314 return; 1315 1316 for (i=in_dev->mc_list; i; i=i->next) 1317 igmp_group_dropped(i); 1318 1319 #ifdef CONFIG_IP_MULTICAST 1320 in_dev->mr_ifc_count = 0; 1321 if (del_timer(&in_dev->mr_ifc_timer)) 1322 __in_dev_put(in_dev); 1323 in_dev->mr_gq_running = 0; 1324 if (del_timer(&in_dev->mr_gq_timer)) 1325 __in_dev_put(in_dev); 1326 igmpv3_clear_delrec(in_dev); 1327 #endif 1328 1329 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1330 } 1331 1332 void ip_mc_init_dev(struct in_device *in_dev) 1333 { 1334 ASSERT_RTNL(); 1335 1336 if (dev_net(in_dev->dev) != &init_net) 1337 return; 1338 1339 in_dev->mc_tomb = NULL; 1340 #ifdef CONFIG_IP_MULTICAST 1341 in_dev->mr_gq_running = 0; 1342 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1343 (unsigned long)in_dev); 1344 in_dev->mr_ifc_count = 0; 1345 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1346 (unsigned long)in_dev); 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 if (dev_net(in_dev->dev) != &init_net) 1363 return; 1364 1365 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1366 1367 for (i=in_dev->mc_list; i; i=i->next) 1368 igmp_group_added(i); 1369 } 1370 1371 /* 1372 * Device is about to be destroyed: clean up. 1373 */ 1374 1375 void ip_mc_destroy_dev(struct in_device *in_dev) 1376 { 1377 struct ip_mc_list *i; 1378 1379 ASSERT_RTNL(); 1380 1381 if (dev_net(in_dev->dev) != &init_net) 1382 return; 1383 1384 /* Deactivate timers */ 1385 ip_mc_down(in_dev); 1386 1387 write_lock_bh(&in_dev->mc_list_lock); 1388 while ((i = in_dev->mc_list) != NULL) { 1389 in_dev->mc_list = i->next; 1390 write_unlock_bh(&in_dev->mc_list_lock); 1391 1392 igmp_group_dropped(i); 1393 ip_ma_put(i); 1394 1395 write_lock_bh(&in_dev->mc_list_lock); 1396 } 1397 write_unlock_bh(&in_dev->mc_list_lock); 1398 } 1399 1400 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1401 { 1402 struct flowi fl = { .nl_u = { .ip4_u = 1403 { .daddr = imr->imr_multiaddr.s_addr } } }; 1404 struct rtable *rt; 1405 struct net_device *dev = NULL; 1406 struct in_device *idev = NULL; 1407 1408 if (imr->imr_ifindex) { 1409 idev = inetdev_by_index(&init_net, imr->imr_ifindex); 1410 if (idev) 1411 __in_dev_put(idev); 1412 return idev; 1413 } 1414 if (imr->imr_address.s_addr) { 1415 dev = ip_dev_find(&init_net, imr->imr_address.s_addr); 1416 if (!dev) 1417 return NULL; 1418 dev_put(dev); 1419 } 1420 1421 if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) { 1422 dev = rt->u.dst.dev; 1423 ip_rt_put(rt); 1424 } 1425 if (dev) { 1426 imr->imr_ifindex = dev->ifindex; 1427 idev = __in_dev_get_rtnl(dev); 1428 } 1429 return idev; 1430 } 1431 1432 /* 1433 * Join a socket to a group 1434 */ 1435 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1436 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1437 1438 1439 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1440 __be32 *psfsrc) 1441 { 1442 struct ip_sf_list *psf, *psf_prev; 1443 int rv = 0; 1444 1445 psf_prev = NULL; 1446 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1447 if (psf->sf_inaddr == *psfsrc) 1448 break; 1449 psf_prev = psf; 1450 } 1451 if (!psf || psf->sf_count[sfmode] == 0) { 1452 /* source filter not found, or count wrong => bug */ 1453 return -ESRCH; 1454 } 1455 psf->sf_count[sfmode]--; 1456 if (psf->sf_count[sfmode] == 0) { 1457 ip_rt_multicast_event(pmc->interface); 1458 } 1459 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1460 #ifdef CONFIG_IP_MULTICAST 1461 struct in_device *in_dev = pmc->interface; 1462 #endif 1463 1464 /* no more filters for this source */ 1465 if (psf_prev) 1466 psf_prev->sf_next = psf->sf_next; 1467 else 1468 pmc->sources = psf->sf_next; 1469 #ifdef CONFIG_IP_MULTICAST 1470 if (psf->sf_oldin && 1471 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1472 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1473 IGMP_Unsolicited_Report_Count; 1474 psf->sf_next = pmc->tomb; 1475 pmc->tomb = psf; 1476 rv = 1; 1477 } else 1478 #endif 1479 kfree(psf); 1480 } 1481 return rv; 1482 } 1483 1484 #ifndef CONFIG_IP_MULTICAST 1485 #define igmp_ifc_event(x) do { } while (0) 1486 #endif 1487 1488 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1489 int sfcount, __be32 *psfsrc, int delta) 1490 { 1491 struct ip_mc_list *pmc; 1492 int changerec = 0; 1493 int i, err; 1494 1495 if (!in_dev) 1496 return -ENODEV; 1497 read_lock(&in_dev->mc_list_lock); 1498 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1499 if (*pmca == pmc->multiaddr) 1500 break; 1501 } 1502 if (!pmc) { 1503 /* MCA not found?? bug */ 1504 read_unlock(&in_dev->mc_list_lock); 1505 return -ESRCH; 1506 } 1507 spin_lock_bh(&pmc->lock); 1508 read_unlock(&in_dev->mc_list_lock); 1509 #ifdef CONFIG_IP_MULTICAST 1510 sf_markstate(pmc); 1511 #endif 1512 if (!delta) { 1513 err = -EINVAL; 1514 if (!pmc->sfcount[sfmode]) 1515 goto out_unlock; 1516 pmc->sfcount[sfmode]--; 1517 } 1518 err = 0; 1519 for (i=0; i<sfcount; i++) { 1520 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1521 1522 changerec |= rv > 0; 1523 if (!err && rv < 0) 1524 err = rv; 1525 } 1526 if (pmc->sfmode == MCAST_EXCLUDE && 1527 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1528 pmc->sfcount[MCAST_INCLUDE]) { 1529 #ifdef CONFIG_IP_MULTICAST 1530 struct ip_sf_list *psf; 1531 #endif 1532 1533 /* filter mode change */ 1534 pmc->sfmode = MCAST_INCLUDE; 1535 #ifdef CONFIG_IP_MULTICAST 1536 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1537 IGMP_Unsolicited_Report_Count; 1538 in_dev->mr_ifc_count = pmc->crcount; 1539 for (psf=pmc->sources; psf; psf = psf->sf_next) 1540 psf->sf_crcount = 0; 1541 igmp_ifc_event(pmc->interface); 1542 } else if (sf_setstate(pmc) || changerec) { 1543 igmp_ifc_event(pmc->interface); 1544 #endif 1545 } 1546 out_unlock: 1547 spin_unlock_bh(&pmc->lock); 1548 return err; 1549 } 1550 1551 /* 1552 * Add multicast single-source filter to the interface list 1553 */ 1554 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1555 __be32 *psfsrc, int delta) 1556 { 1557 struct ip_sf_list *psf, *psf_prev; 1558 1559 psf_prev = NULL; 1560 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1561 if (psf->sf_inaddr == *psfsrc) 1562 break; 1563 psf_prev = psf; 1564 } 1565 if (!psf) { 1566 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1567 if (!psf) 1568 return -ENOBUFS; 1569 psf->sf_inaddr = *psfsrc; 1570 if (psf_prev) { 1571 psf_prev->sf_next = psf; 1572 } else 1573 pmc->sources = psf; 1574 } 1575 psf->sf_count[sfmode]++; 1576 if (psf->sf_count[sfmode] == 1) { 1577 ip_rt_multicast_event(pmc->interface); 1578 } 1579 return 0; 1580 } 1581 1582 #ifdef CONFIG_IP_MULTICAST 1583 static void sf_markstate(struct ip_mc_list *pmc) 1584 { 1585 struct ip_sf_list *psf; 1586 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1587 1588 for (psf=pmc->sources; psf; psf=psf->sf_next) 1589 if (pmc->sfcount[MCAST_EXCLUDE]) { 1590 psf->sf_oldin = mca_xcount == 1591 psf->sf_count[MCAST_EXCLUDE] && 1592 !psf->sf_count[MCAST_INCLUDE]; 1593 } else 1594 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1595 } 1596 1597 static int sf_setstate(struct ip_mc_list *pmc) 1598 { 1599 struct ip_sf_list *psf, *dpsf; 1600 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1601 int qrv = pmc->interface->mr_qrv; 1602 int new_in, rv; 1603 1604 rv = 0; 1605 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1606 if (pmc->sfcount[MCAST_EXCLUDE]) { 1607 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1608 !psf->sf_count[MCAST_INCLUDE]; 1609 } else 1610 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1611 if (new_in) { 1612 if (!psf->sf_oldin) { 1613 struct ip_sf_list *prev = NULL; 1614 1615 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1616 if (dpsf->sf_inaddr == psf->sf_inaddr) 1617 break; 1618 prev = dpsf; 1619 } 1620 if (dpsf) { 1621 if (prev) 1622 prev->sf_next = dpsf->sf_next; 1623 else 1624 pmc->tomb = dpsf->sf_next; 1625 kfree(dpsf); 1626 } 1627 psf->sf_crcount = qrv; 1628 rv++; 1629 } 1630 } else if (psf->sf_oldin) { 1631 1632 psf->sf_crcount = 0; 1633 /* 1634 * add or update "delete" records if an active filter 1635 * is now inactive 1636 */ 1637 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1638 if (dpsf->sf_inaddr == psf->sf_inaddr) 1639 break; 1640 if (!dpsf) { 1641 dpsf = (struct ip_sf_list *) 1642 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1643 if (!dpsf) 1644 continue; 1645 *dpsf = *psf; 1646 /* pmc->lock held by callers */ 1647 dpsf->sf_next = pmc->tomb; 1648 pmc->tomb = dpsf; 1649 } 1650 dpsf->sf_crcount = qrv; 1651 rv++; 1652 } 1653 } 1654 return rv; 1655 } 1656 #endif 1657 1658 /* 1659 * Add multicast source filter list to the interface list 1660 */ 1661 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1662 int sfcount, __be32 *psfsrc, int delta) 1663 { 1664 struct ip_mc_list *pmc; 1665 int isexclude; 1666 int i, err; 1667 1668 if (!in_dev) 1669 return -ENODEV; 1670 read_lock(&in_dev->mc_list_lock); 1671 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1672 if (*pmca == pmc->multiaddr) 1673 break; 1674 } 1675 if (!pmc) { 1676 /* MCA not found?? bug */ 1677 read_unlock(&in_dev->mc_list_lock); 1678 return -ESRCH; 1679 } 1680 spin_lock_bh(&pmc->lock); 1681 read_unlock(&in_dev->mc_list_lock); 1682 1683 #ifdef CONFIG_IP_MULTICAST 1684 sf_markstate(pmc); 1685 #endif 1686 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1687 if (!delta) 1688 pmc->sfcount[sfmode]++; 1689 err = 0; 1690 for (i=0; i<sfcount; i++) { 1691 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1692 if (err) 1693 break; 1694 } 1695 if (err) { 1696 int j; 1697 1698 pmc->sfcount[sfmode]--; 1699 for (j=0; j<i; j++) 1700 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1701 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1702 #ifdef CONFIG_IP_MULTICAST 1703 struct ip_sf_list *psf; 1704 in_dev = pmc->interface; 1705 #endif 1706 1707 /* filter mode change */ 1708 if (pmc->sfcount[MCAST_EXCLUDE]) 1709 pmc->sfmode = MCAST_EXCLUDE; 1710 else if (pmc->sfcount[MCAST_INCLUDE]) 1711 pmc->sfmode = MCAST_INCLUDE; 1712 #ifdef CONFIG_IP_MULTICAST 1713 /* else no filters; keep old mode for reports */ 1714 1715 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1716 IGMP_Unsolicited_Report_Count; 1717 in_dev->mr_ifc_count = pmc->crcount; 1718 for (psf=pmc->sources; psf; psf = psf->sf_next) 1719 psf->sf_crcount = 0; 1720 igmp_ifc_event(in_dev); 1721 } else if (sf_setstate(pmc)) { 1722 igmp_ifc_event(in_dev); 1723 #endif 1724 } 1725 spin_unlock_bh(&pmc->lock); 1726 return err; 1727 } 1728 1729 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1730 { 1731 struct ip_sf_list *psf, *nextpsf; 1732 1733 for (psf=pmc->tomb; psf; psf=nextpsf) { 1734 nextpsf = psf->sf_next; 1735 kfree(psf); 1736 } 1737 pmc->tomb = NULL; 1738 for (psf=pmc->sources; psf; psf=nextpsf) { 1739 nextpsf = psf->sf_next; 1740 kfree(psf); 1741 } 1742 pmc->sources = NULL; 1743 pmc->sfmode = MCAST_EXCLUDE; 1744 pmc->sfcount[MCAST_INCLUDE] = 0; 1745 pmc->sfcount[MCAST_EXCLUDE] = 1; 1746 } 1747 1748 1749 /* 1750 * Join a multicast group 1751 */ 1752 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1753 { 1754 int err; 1755 __be32 addr = imr->imr_multiaddr.s_addr; 1756 struct ip_mc_socklist *iml=NULL, *i; 1757 struct in_device *in_dev; 1758 struct inet_sock *inet = inet_sk(sk); 1759 int ifindex; 1760 int count = 0; 1761 1762 if (!ipv4_is_multicast(addr)) 1763 return -EINVAL; 1764 1765 if (sock_net(sk) != &init_net) 1766 return -EPROTONOSUPPORT; 1767 1768 rtnl_lock(); 1769 1770 in_dev = ip_mc_find_dev(imr); 1771 1772 if (!in_dev) { 1773 iml = NULL; 1774 err = -ENODEV; 1775 goto done; 1776 } 1777 1778 err = -EADDRINUSE; 1779 ifindex = imr->imr_ifindex; 1780 for (i = inet->mc_list; i; i = i->next) { 1781 if (i->multi.imr_multiaddr.s_addr == addr && 1782 i->multi.imr_ifindex == ifindex) 1783 goto done; 1784 count++; 1785 } 1786 err = -ENOBUFS; 1787 if (count >= sysctl_igmp_max_memberships) 1788 goto done; 1789 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1790 if (iml == NULL) 1791 goto done; 1792 1793 memcpy(&iml->multi, imr, sizeof(*imr)); 1794 iml->next = inet->mc_list; 1795 iml->sflist = NULL; 1796 iml->sfmode = MCAST_EXCLUDE; 1797 inet->mc_list = iml; 1798 ip_mc_inc_group(in_dev, addr); 1799 err = 0; 1800 done: 1801 rtnl_unlock(); 1802 return err; 1803 } 1804 1805 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1806 struct in_device *in_dev) 1807 { 1808 int err; 1809 1810 if (iml->sflist == NULL) { 1811 /* any-source empty exclude case */ 1812 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1813 iml->sfmode, 0, NULL, 0); 1814 } 1815 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1816 iml->sfmode, iml->sflist->sl_count, 1817 iml->sflist->sl_addr, 0); 1818 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1819 iml->sflist = NULL; 1820 return err; 1821 } 1822 1823 /* 1824 * Ask a socket to leave a group. 1825 */ 1826 1827 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1828 { 1829 struct inet_sock *inet = inet_sk(sk); 1830 struct ip_mc_socklist *iml, **imlp; 1831 struct in_device *in_dev; 1832 __be32 group = imr->imr_multiaddr.s_addr; 1833 u32 ifindex; 1834 int ret = -EADDRNOTAVAIL; 1835 1836 if (sock_net(sk) != &init_net) 1837 return -EPROTONOSUPPORT; 1838 1839 rtnl_lock(); 1840 in_dev = ip_mc_find_dev(imr); 1841 ifindex = imr->imr_ifindex; 1842 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1843 if (iml->multi.imr_multiaddr.s_addr != group) 1844 continue; 1845 if (ifindex) { 1846 if (iml->multi.imr_ifindex != ifindex) 1847 continue; 1848 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1849 iml->multi.imr_address.s_addr) 1850 continue; 1851 1852 (void) ip_mc_leave_src(sk, iml, in_dev); 1853 1854 *imlp = iml->next; 1855 1856 if (in_dev) 1857 ip_mc_dec_group(in_dev, group); 1858 rtnl_unlock(); 1859 sock_kfree_s(sk, iml, sizeof(*iml)); 1860 return 0; 1861 } 1862 if (!in_dev) 1863 ret = -ENODEV; 1864 rtnl_unlock(); 1865 return ret; 1866 } 1867 1868 int ip_mc_source(int add, int omode, struct sock *sk, struct 1869 ip_mreq_source *mreqs, int ifindex) 1870 { 1871 int err; 1872 struct ip_mreqn imr; 1873 __be32 addr = mreqs->imr_multiaddr; 1874 struct ip_mc_socklist *pmc; 1875 struct in_device *in_dev = NULL; 1876 struct inet_sock *inet = inet_sk(sk); 1877 struct ip_sf_socklist *psl; 1878 int leavegroup = 0; 1879 int i, j, rv; 1880 1881 if (!ipv4_is_multicast(addr)) 1882 return -EINVAL; 1883 1884 if (sock_net(sk) != &init_net) 1885 return -EPROTONOSUPPORT; 1886 1887 rtnl_lock(); 1888 1889 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1890 imr.imr_address.s_addr = mreqs->imr_interface; 1891 imr.imr_ifindex = ifindex; 1892 in_dev = ip_mc_find_dev(&imr); 1893 1894 if (!in_dev) { 1895 err = -ENODEV; 1896 goto done; 1897 } 1898 err = -EADDRNOTAVAIL; 1899 1900 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1901 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1902 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1903 break; 1904 } 1905 if (!pmc) { /* must have a prior join */ 1906 err = -EINVAL; 1907 goto done; 1908 } 1909 /* if a source filter was set, must be the same mode as before */ 1910 if (pmc->sflist) { 1911 if (pmc->sfmode != omode) { 1912 err = -EINVAL; 1913 goto done; 1914 } 1915 } else if (pmc->sfmode != omode) { 1916 /* allow mode switches for empty-set filters */ 1917 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1918 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1919 NULL, 0); 1920 pmc->sfmode = omode; 1921 } 1922 1923 psl = pmc->sflist; 1924 if (!add) { 1925 if (!psl) 1926 goto done; /* err = -EADDRNOTAVAIL */ 1927 rv = !0; 1928 for (i=0; i<psl->sl_count; i++) { 1929 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1930 sizeof(__be32)); 1931 if (rv == 0) 1932 break; 1933 } 1934 if (rv) /* source not found */ 1935 goto done; /* err = -EADDRNOTAVAIL */ 1936 1937 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1938 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1939 leavegroup = 1; 1940 goto done; 1941 } 1942 1943 /* update the interface filter */ 1944 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1945 &mreqs->imr_sourceaddr, 1); 1946 1947 for (j=i+1; j<psl->sl_count; j++) 1948 psl->sl_addr[j-1] = psl->sl_addr[j]; 1949 psl->sl_count--; 1950 err = 0; 1951 goto done; 1952 } 1953 /* else, add a new source to the filter */ 1954 1955 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1956 err = -ENOBUFS; 1957 goto done; 1958 } 1959 if (!psl || psl->sl_count == psl->sl_max) { 1960 struct ip_sf_socklist *newpsl; 1961 int count = IP_SFBLOCK; 1962 1963 if (psl) 1964 count += psl->sl_max; 1965 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1966 if (!newpsl) { 1967 err = -ENOBUFS; 1968 goto done; 1969 } 1970 newpsl->sl_max = count; 1971 newpsl->sl_count = count - IP_SFBLOCK; 1972 if (psl) { 1973 for (i=0; i<psl->sl_count; i++) 1974 newpsl->sl_addr[i] = psl->sl_addr[i]; 1975 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1976 } 1977 pmc->sflist = psl = newpsl; 1978 } 1979 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1980 for (i=0; i<psl->sl_count; i++) { 1981 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1982 sizeof(__be32)); 1983 if (rv == 0) 1984 break; 1985 } 1986 if (rv == 0) /* address already there is an error */ 1987 goto done; 1988 for (j=psl->sl_count-1; j>=i; j--) 1989 psl->sl_addr[j+1] = psl->sl_addr[j]; 1990 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1991 psl->sl_count++; 1992 err = 0; 1993 /* update the interface list */ 1994 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1995 &mreqs->imr_sourceaddr, 1); 1996 done: 1997 rtnl_unlock(); 1998 if (leavegroup) 1999 return ip_mc_leave_group(sk, &imr); 2000 return err; 2001 } 2002 2003 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2004 { 2005 int err = 0; 2006 struct ip_mreqn imr; 2007 __be32 addr = msf->imsf_multiaddr; 2008 struct ip_mc_socklist *pmc; 2009 struct in_device *in_dev; 2010 struct inet_sock *inet = inet_sk(sk); 2011 struct ip_sf_socklist *newpsl, *psl; 2012 int leavegroup = 0; 2013 2014 if (!ipv4_is_multicast(addr)) 2015 return -EINVAL; 2016 if (msf->imsf_fmode != MCAST_INCLUDE && 2017 msf->imsf_fmode != MCAST_EXCLUDE) 2018 return -EINVAL; 2019 2020 if (sock_net(sk) != &init_net) 2021 return -EPROTONOSUPPORT; 2022 2023 rtnl_lock(); 2024 2025 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2026 imr.imr_address.s_addr = msf->imsf_interface; 2027 imr.imr_ifindex = ifindex; 2028 in_dev = ip_mc_find_dev(&imr); 2029 2030 if (!in_dev) { 2031 err = -ENODEV; 2032 goto done; 2033 } 2034 2035 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2036 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2037 leavegroup = 1; 2038 goto done; 2039 } 2040 2041 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2042 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2043 pmc->multi.imr_ifindex == imr.imr_ifindex) 2044 break; 2045 } 2046 if (!pmc) { /* must have a prior join */ 2047 err = -EINVAL; 2048 goto done; 2049 } 2050 if (msf->imsf_numsrc) { 2051 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2052 GFP_KERNEL); 2053 if (!newpsl) { 2054 err = -ENOBUFS; 2055 goto done; 2056 } 2057 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2058 memcpy(newpsl->sl_addr, msf->imsf_slist, 2059 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2060 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2061 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2062 if (err) { 2063 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2064 goto done; 2065 } 2066 } else { 2067 newpsl = NULL; 2068 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2069 msf->imsf_fmode, 0, NULL, 0); 2070 } 2071 psl = pmc->sflist; 2072 if (psl) { 2073 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2074 psl->sl_count, psl->sl_addr, 0); 2075 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2076 } else 2077 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2078 0, NULL, 0); 2079 pmc->sflist = newpsl; 2080 pmc->sfmode = msf->imsf_fmode; 2081 err = 0; 2082 done: 2083 rtnl_unlock(); 2084 if (leavegroup) 2085 err = ip_mc_leave_group(sk, &imr); 2086 return err; 2087 } 2088 2089 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2090 struct ip_msfilter __user *optval, int __user *optlen) 2091 { 2092 int err, len, count, copycount; 2093 struct ip_mreqn imr; 2094 __be32 addr = msf->imsf_multiaddr; 2095 struct ip_mc_socklist *pmc; 2096 struct in_device *in_dev; 2097 struct inet_sock *inet = inet_sk(sk); 2098 struct ip_sf_socklist *psl; 2099 2100 if (!ipv4_is_multicast(addr)) 2101 return -EINVAL; 2102 2103 if (sock_net(sk) != &init_net) 2104 return -EPROTONOSUPPORT; 2105 2106 rtnl_lock(); 2107 2108 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2109 imr.imr_address.s_addr = msf->imsf_interface; 2110 imr.imr_ifindex = 0; 2111 in_dev = ip_mc_find_dev(&imr); 2112 2113 if (!in_dev) { 2114 err = -ENODEV; 2115 goto done; 2116 } 2117 err = -EADDRNOTAVAIL; 2118 2119 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2120 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2121 pmc->multi.imr_ifindex == imr.imr_ifindex) 2122 break; 2123 } 2124 if (!pmc) /* must have a prior join */ 2125 goto done; 2126 msf->imsf_fmode = pmc->sfmode; 2127 psl = pmc->sflist; 2128 rtnl_unlock(); 2129 if (!psl) { 2130 len = 0; 2131 count = 0; 2132 } else { 2133 count = psl->sl_count; 2134 } 2135 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2136 len = copycount * sizeof(psl->sl_addr[0]); 2137 msf->imsf_numsrc = count; 2138 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2139 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2140 return -EFAULT; 2141 } 2142 if (len && 2143 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2144 return -EFAULT; 2145 return 0; 2146 done: 2147 rtnl_unlock(); 2148 return err; 2149 } 2150 2151 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2152 struct group_filter __user *optval, int __user *optlen) 2153 { 2154 int err, i, count, copycount; 2155 struct sockaddr_in *psin; 2156 __be32 addr; 2157 struct ip_mc_socklist *pmc; 2158 struct inet_sock *inet = inet_sk(sk); 2159 struct ip_sf_socklist *psl; 2160 2161 psin = (struct sockaddr_in *)&gsf->gf_group; 2162 if (psin->sin_family != AF_INET) 2163 return -EINVAL; 2164 addr = psin->sin_addr.s_addr; 2165 if (!ipv4_is_multicast(addr)) 2166 return -EINVAL; 2167 2168 if (sock_net(sk) != &init_net) 2169 return -EPROTONOSUPPORT; 2170 2171 rtnl_lock(); 2172 2173 err = -EADDRNOTAVAIL; 2174 2175 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2176 if (pmc->multi.imr_multiaddr.s_addr == addr && 2177 pmc->multi.imr_ifindex == gsf->gf_interface) 2178 break; 2179 } 2180 if (!pmc) /* must have a prior join */ 2181 goto done; 2182 gsf->gf_fmode = pmc->sfmode; 2183 psl = pmc->sflist; 2184 rtnl_unlock(); 2185 count = psl ? psl->sl_count : 0; 2186 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2187 gsf->gf_numsrc = count; 2188 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2189 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2190 return -EFAULT; 2191 } 2192 for (i=0; i<copycount; i++) { 2193 struct sockaddr_storage ss; 2194 2195 psin = (struct sockaddr_in *)&ss; 2196 memset(&ss, 0, sizeof(ss)); 2197 psin->sin_family = AF_INET; 2198 psin->sin_addr.s_addr = psl->sl_addr[i]; 2199 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2200 return -EFAULT; 2201 } 2202 return 0; 2203 done: 2204 rtnl_unlock(); 2205 return err; 2206 } 2207 2208 /* 2209 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2210 */ 2211 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2212 { 2213 struct inet_sock *inet = inet_sk(sk); 2214 struct ip_mc_socklist *pmc; 2215 struct ip_sf_socklist *psl; 2216 int i; 2217 2218 if (!ipv4_is_multicast(loc_addr)) 2219 return 1; 2220 2221 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2222 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2223 pmc->multi.imr_ifindex == dif) 2224 break; 2225 } 2226 if (!pmc) 2227 return 1; 2228 psl = pmc->sflist; 2229 if (!psl) 2230 return pmc->sfmode == MCAST_EXCLUDE; 2231 2232 for (i=0; i<psl->sl_count; i++) { 2233 if (psl->sl_addr[i] == rmt_addr) 2234 break; 2235 } 2236 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2237 return 0; 2238 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2239 return 0; 2240 return 1; 2241 } 2242 2243 /* 2244 * A socket is closing. 2245 */ 2246 2247 void ip_mc_drop_socket(struct sock *sk) 2248 { 2249 struct inet_sock *inet = inet_sk(sk); 2250 struct ip_mc_socklist *iml; 2251 2252 if (inet->mc_list == NULL) 2253 return; 2254 2255 if (sock_net(sk) != &init_net) 2256 return; 2257 2258 rtnl_lock(); 2259 while ((iml = inet->mc_list) != NULL) { 2260 struct in_device *in_dev; 2261 inet->mc_list = iml->next; 2262 2263 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex); 2264 (void) ip_mc_leave_src(sk, iml, in_dev); 2265 if (in_dev != NULL) { 2266 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2267 in_dev_put(in_dev); 2268 } 2269 sock_kfree_s(sk, iml, sizeof(*iml)); 2270 } 2271 rtnl_unlock(); 2272 } 2273 2274 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2275 { 2276 struct ip_mc_list *im; 2277 struct ip_sf_list *psf; 2278 int rv = 0; 2279 2280 read_lock(&in_dev->mc_list_lock); 2281 for (im=in_dev->mc_list; im; im=im->next) { 2282 if (im->multiaddr == mc_addr) 2283 break; 2284 } 2285 if (im && proto == IPPROTO_IGMP) { 2286 rv = 1; 2287 } else if (im) { 2288 if (src_addr) { 2289 for (psf=im->sources; psf; psf=psf->sf_next) { 2290 if (psf->sf_inaddr == src_addr) 2291 break; 2292 } 2293 if (psf) 2294 rv = psf->sf_count[MCAST_INCLUDE] || 2295 psf->sf_count[MCAST_EXCLUDE] != 2296 im->sfcount[MCAST_EXCLUDE]; 2297 else 2298 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2299 } else 2300 rv = 1; /* unspecified source; tentatively allow */ 2301 } 2302 read_unlock(&in_dev->mc_list_lock); 2303 return rv; 2304 } 2305 2306 #if defined(CONFIG_PROC_FS) 2307 struct igmp_mc_iter_state { 2308 struct net_device *dev; 2309 struct in_device *in_dev; 2310 }; 2311 2312 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2313 2314 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2315 { 2316 struct ip_mc_list *im = NULL; 2317 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2318 2319 state->in_dev = NULL; 2320 for_each_netdev(&init_net, state->dev) { 2321 struct in_device *in_dev; 2322 in_dev = in_dev_get(state->dev); 2323 if (!in_dev) 2324 continue; 2325 read_lock(&in_dev->mc_list_lock); 2326 im = in_dev->mc_list; 2327 if (im) { 2328 state->in_dev = in_dev; 2329 break; 2330 } 2331 read_unlock(&in_dev->mc_list_lock); 2332 in_dev_put(in_dev); 2333 } 2334 return im; 2335 } 2336 2337 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2338 { 2339 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2340 im = im->next; 2341 while (!im) { 2342 if (likely(state->in_dev != NULL)) { 2343 read_unlock(&state->in_dev->mc_list_lock); 2344 in_dev_put(state->in_dev); 2345 } 2346 state->dev = next_net_device(state->dev); 2347 if (!state->dev) { 2348 state->in_dev = NULL; 2349 break; 2350 } 2351 state->in_dev = in_dev_get(state->dev); 2352 if (!state->in_dev) 2353 continue; 2354 read_lock(&state->in_dev->mc_list_lock); 2355 im = state->in_dev->mc_list; 2356 } 2357 return im; 2358 } 2359 2360 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2361 { 2362 struct ip_mc_list *im = igmp_mc_get_first(seq); 2363 if (im) 2364 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2365 --pos; 2366 return pos ? NULL : im; 2367 } 2368 2369 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2370 __acquires(dev_base_lock) 2371 { 2372 read_lock(&dev_base_lock); 2373 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2374 } 2375 2376 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2377 { 2378 struct ip_mc_list *im; 2379 if (v == SEQ_START_TOKEN) 2380 im = igmp_mc_get_first(seq); 2381 else 2382 im = igmp_mc_get_next(seq, v); 2383 ++*pos; 2384 return im; 2385 } 2386 2387 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2388 __releases(dev_base_lock) 2389 { 2390 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2391 if (likely(state->in_dev != NULL)) { 2392 read_unlock(&state->in_dev->mc_list_lock); 2393 in_dev_put(state->in_dev); 2394 state->in_dev = NULL; 2395 } 2396 state->dev = NULL; 2397 read_unlock(&dev_base_lock); 2398 } 2399 2400 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2401 { 2402 if (v == SEQ_START_TOKEN) 2403 seq_puts(seq, 2404 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2405 else { 2406 struct ip_mc_list *im = (struct ip_mc_list *)v; 2407 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2408 char *querier; 2409 #ifdef CONFIG_IP_MULTICAST 2410 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2411 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2412 "V3"; 2413 #else 2414 querier = "NONE"; 2415 #endif 2416 2417 if (state->in_dev->mc_list == im) { 2418 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2419 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2420 } 2421 2422 seq_printf(seq, 2423 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2424 im->multiaddr, im->users, 2425 im->tm_running, im->tm_running ? 2426 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2427 im->reporter); 2428 } 2429 return 0; 2430 } 2431 2432 static const struct seq_operations igmp_mc_seq_ops = { 2433 .start = igmp_mc_seq_start, 2434 .next = igmp_mc_seq_next, 2435 .stop = igmp_mc_seq_stop, 2436 .show = igmp_mc_seq_show, 2437 }; 2438 2439 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2440 { 2441 return seq_open_private(file, &igmp_mc_seq_ops, 2442 sizeof(struct igmp_mc_iter_state)); 2443 } 2444 2445 static const struct file_operations igmp_mc_seq_fops = { 2446 .owner = THIS_MODULE, 2447 .open = igmp_mc_seq_open, 2448 .read = seq_read, 2449 .llseek = seq_lseek, 2450 .release = seq_release_private, 2451 }; 2452 2453 struct igmp_mcf_iter_state { 2454 struct net_device *dev; 2455 struct in_device *idev; 2456 struct ip_mc_list *im; 2457 }; 2458 2459 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2460 2461 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2462 { 2463 struct ip_sf_list *psf = NULL; 2464 struct ip_mc_list *im = NULL; 2465 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2466 2467 state->idev = NULL; 2468 state->im = NULL; 2469 for_each_netdev(&init_net, state->dev) { 2470 struct in_device *idev; 2471 idev = in_dev_get(state->dev); 2472 if (unlikely(idev == NULL)) 2473 continue; 2474 read_lock(&idev->mc_list_lock); 2475 im = idev->mc_list; 2476 if (likely(im != NULL)) { 2477 spin_lock_bh(&im->lock); 2478 psf = im->sources; 2479 if (likely(psf != NULL)) { 2480 state->im = im; 2481 state->idev = idev; 2482 break; 2483 } 2484 spin_unlock_bh(&im->lock); 2485 } 2486 read_unlock(&idev->mc_list_lock); 2487 in_dev_put(idev); 2488 } 2489 return psf; 2490 } 2491 2492 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2493 { 2494 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2495 2496 psf = psf->sf_next; 2497 while (!psf) { 2498 spin_unlock_bh(&state->im->lock); 2499 state->im = state->im->next; 2500 while (!state->im) { 2501 if (likely(state->idev != NULL)) { 2502 read_unlock(&state->idev->mc_list_lock); 2503 in_dev_put(state->idev); 2504 } 2505 state->dev = next_net_device(state->dev); 2506 if (!state->dev) { 2507 state->idev = NULL; 2508 goto out; 2509 } 2510 state->idev = in_dev_get(state->dev); 2511 if (!state->idev) 2512 continue; 2513 read_lock(&state->idev->mc_list_lock); 2514 state->im = state->idev->mc_list; 2515 } 2516 if (!state->im) 2517 break; 2518 spin_lock_bh(&state->im->lock); 2519 psf = state->im->sources; 2520 } 2521 out: 2522 return psf; 2523 } 2524 2525 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2526 { 2527 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2528 if (psf) 2529 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2530 --pos; 2531 return pos ? NULL : psf; 2532 } 2533 2534 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2535 { 2536 read_lock(&dev_base_lock); 2537 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2538 } 2539 2540 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2541 { 2542 struct ip_sf_list *psf; 2543 if (v == SEQ_START_TOKEN) 2544 psf = igmp_mcf_get_first(seq); 2545 else 2546 psf = igmp_mcf_get_next(seq, v); 2547 ++*pos; 2548 return psf; 2549 } 2550 2551 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2552 { 2553 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2554 if (likely(state->im != NULL)) { 2555 spin_unlock_bh(&state->im->lock); 2556 state->im = NULL; 2557 } 2558 if (likely(state->idev != NULL)) { 2559 read_unlock(&state->idev->mc_list_lock); 2560 in_dev_put(state->idev); 2561 state->idev = NULL; 2562 } 2563 state->dev = NULL; 2564 read_unlock(&dev_base_lock); 2565 } 2566 2567 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2568 { 2569 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2570 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2571 2572 if (v == SEQ_START_TOKEN) { 2573 seq_printf(seq, 2574 "%3s %6s " 2575 "%10s %10s %6s %6s\n", "Idx", 2576 "Device", "MCA", 2577 "SRC", "INC", "EXC"); 2578 } else { 2579 seq_printf(seq, 2580 "%3d %6.6s 0x%08x " 2581 "0x%08x %6lu %6lu\n", 2582 state->dev->ifindex, state->dev->name, 2583 ntohl(state->im->multiaddr), 2584 ntohl(psf->sf_inaddr), 2585 psf->sf_count[MCAST_INCLUDE], 2586 psf->sf_count[MCAST_EXCLUDE]); 2587 } 2588 return 0; 2589 } 2590 2591 static const struct seq_operations igmp_mcf_seq_ops = { 2592 .start = igmp_mcf_seq_start, 2593 .next = igmp_mcf_seq_next, 2594 .stop = igmp_mcf_seq_stop, 2595 .show = igmp_mcf_seq_show, 2596 }; 2597 2598 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2599 { 2600 return seq_open_private(file, &igmp_mcf_seq_ops, 2601 sizeof(struct igmp_mcf_iter_state)); 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(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2615 proc_net_fops_create(&init_net, "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