1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * This code implements the IGMP protocol as defined in RFC1112. There has 5 * been a further revision of this protocol since which is now supported. 6 * 7 * If you have trouble with this module be careful what gcc you have used, 8 * the older version didn't come out right using gcc 2.5.8, the newer one 9 * seems to fall out with gcc 2.6.2. 10 * 11 * Authors: 12 * Alan Cox <Alan.Cox@linux.org> 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 * Fixes: 20 * 21 * Alan Cox : Added lots of __inline__ to optimise 22 * the memory usage of all the tiny little 23 * functions. 24 * Alan Cox : Dumped the header building experiment. 25 * Alan Cox : Minor tweaks ready for multicast routing 26 * and extended IGMP protocol. 27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 28 * writes utterly bogus code otherwise (sigh) 29 * fixed IGMP loopback to behave in the manner 30 * desired by mrouted, fixed the fact it has been 31 * broken since 1.3.6 and cleaned up a few minor 32 * points. 33 * 34 * Chih-Jen Chang : Tried to revise IGMP to Version 2 35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 36 * The enhancements are mainly based on Steve Deering's 37 * ipmulti-3.5 source code. 38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 40 * the mrouted version on that device. 41 * Chih-Jen Chang : Added the max_resp_time parameter to 42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 43 * to identify the multicast router version 44 * and do what the IGMP version 2 specified. 45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 46 * Tsu-Sheng Tsao if the specified time expired. 47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 48 * Alan Cox : Use GFP_ATOMIC in the right places. 49 * Christian Daudt : igmp timer wasn't set for local group 50 * memberships but was being deleted, 51 * which caused a "del_timer() called 52 * from %p with timer not initialized\n" 53 * message (960131). 54 * Christian Daudt : removed del_timer from 55 * igmp_timer_expire function (960205). 56 * Christian Daudt : igmp_heard_report now only calls 57 * igmp_timer_expire if tm->running is 58 * true (960216). 59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 60 * igmp_heard_query never trigger. Expiry 61 * miscalculation fixed in igmp_heard_query 62 * and random() made to return unsigned to 63 * prevent negative expiry times. 64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 65 * fix from pending 2.1.x patches. 66 * Alan Cox: Forget to enable FDDI support earlier. 67 * Alexey Kuznetsov: Fixed leaving groups on device down. 68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 69 * David L Stevens: IGMPv3 support, with help from 70 * Vinay Kulkarni 71 */ 72 73 #include <linux/module.h> 74 #include <asm/uaccess.h> 75 #include <asm/system.h> 76 #include <linux/types.h> 77 #include <linux/kernel.h> 78 #include <linux/jiffies.h> 79 #include <linux/string.h> 80 #include <linux/socket.h> 81 #include <linux/sockios.h> 82 #include <linux/in.h> 83 #include <linux/inet.h> 84 #include <linux/netdevice.h> 85 #include <linux/skbuff.h> 86 #include <linux/inetdevice.h> 87 #include <linux/igmp.h> 88 #include <linux/if_arp.h> 89 #include <linux/rtnetlink.h> 90 #include <linux/times.h> 91 92 #include <net/net_namespace.h> 93 #include <net/arp.h> 94 #include <net/ip.h> 95 #include <net/protocol.h> 96 #include <net/route.h> 97 #include <net/sock.h> 98 #include <net/checksum.h> 99 #include <linux/netfilter_ipv4.h> 100 #ifdef CONFIG_IP_MROUTE 101 #include <linux/mroute.h> 102 #endif 103 #ifdef CONFIG_PROC_FS 104 #include <linux/proc_fs.h> 105 #include <linux/seq_file.h> 106 #endif 107 108 #define IP_MAX_MEMBERSHIPS 20 109 #define IP_MAX_MSF 10 110 111 #ifdef CONFIG_IP_MULTICAST 112 /* Parameter names and values are taken from igmp-v2-06 draft */ 113 114 #define IGMP_V1_Router_Present_Timeout (400*HZ) 115 #define IGMP_V2_Router_Present_Timeout (400*HZ) 116 #define IGMP_Unsolicited_Report_Interval (10*HZ) 117 #define IGMP_Query_Response_Interval (10*HZ) 118 #define IGMP_Unsolicited_Report_Count 2 119 120 121 #define IGMP_Initial_Report_Delay (1) 122 123 /* IGMP_Initial_Report_Delay is not from IGMP specs! 124 * IGMP specs require to report membership immediately after 125 * joining a group, but we delay the first report by a 126 * small interval. It seems more natural and still does not 127 * contradict to specs provided this delay is small enough. 128 */ 129 130 #define IGMP_V1_SEEN(in_dev) \ 131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 133 ((in_dev)->mr_v1_seen && \ 134 time_before(jiffies, (in_dev)->mr_v1_seen))) 135 #define IGMP_V2_SEEN(in_dev) \ 136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 138 ((in_dev)->mr_v2_seen && \ 139 time_before(jiffies, (in_dev)->mr_v2_seen))) 140 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 143 static void igmpv3_clear_delrec(struct in_device *in_dev); 144 static int sf_setstate(struct ip_mc_list *pmc); 145 static void sf_markstate(struct ip_mc_list *pmc); 146 #endif 147 static void ip_mc_clear_src(struct ip_mc_list *pmc); 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 149 int sfcount, __be32 *psfsrc, int delta); 150 151 static void ip_ma_put(struct ip_mc_list *im) 152 { 153 if (atomic_dec_and_test(&im->refcnt)) { 154 in_dev_put(im->interface); 155 kfree(im); 156 } 157 } 158 159 #ifdef CONFIG_IP_MULTICAST 160 161 /* 162 * Timer management 163 */ 164 165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 166 { 167 spin_lock_bh(&im->lock); 168 if (del_timer(&im->timer)) 169 atomic_dec(&im->refcnt); 170 im->tm_running=0; 171 im->reporter = 0; 172 im->unsolicit_count = 0; 173 spin_unlock_bh(&im->lock); 174 } 175 176 /* It must be called with locked im->lock */ 177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 178 { 179 int tv=net_random() % max_delay; 180 181 im->tm_running=1; 182 if (!mod_timer(&im->timer, jiffies+tv+2)) 183 atomic_inc(&im->refcnt); 184 } 185 186 static void igmp_gq_start_timer(struct in_device *in_dev) 187 { 188 int tv = net_random() % in_dev->mr_maxdelay; 189 190 in_dev->mr_gq_running = 1; 191 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 192 in_dev_hold(in_dev); 193 } 194 195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 196 { 197 int tv = net_random() % delay; 198 199 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 200 in_dev_hold(in_dev); 201 } 202 203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 204 { 205 spin_lock_bh(&im->lock); 206 im->unsolicit_count = 0; 207 if (del_timer(&im->timer)) { 208 if ((long)(im->timer.expires-jiffies) < max_delay) { 209 add_timer(&im->timer); 210 im->tm_running=1; 211 spin_unlock_bh(&im->lock); 212 return; 213 } 214 atomic_dec(&im->refcnt); 215 } 216 igmp_start_timer(im, max_delay); 217 spin_unlock_bh(&im->lock); 218 } 219 220 221 /* 222 * Send an IGMP report. 223 */ 224 225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 226 227 228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 229 int gdeleted, int sdeleted) 230 { 231 switch (type) { 232 case IGMPV3_MODE_IS_INCLUDE: 233 case IGMPV3_MODE_IS_EXCLUDE: 234 if (gdeleted || sdeleted) 235 return 0; 236 if (!(pmc->gsquery && !psf->sf_gsresp)) { 237 if (pmc->sfmode == MCAST_INCLUDE) 238 return 1; 239 /* don't include if this source is excluded 240 * in all filters 241 */ 242 if (psf->sf_count[MCAST_INCLUDE]) 243 return type == IGMPV3_MODE_IS_INCLUDE; 244 return pmc->sfcount[MCAST_EXCLUDE] == 245 psf->sf_count[MCAST_EXCLUDE]; 246 } 247 return 0; 248 case IGMPV3_CHANGE_TO_INCLUDE: 249 if (gdeleted || sdeleted) 250 return 0; 251 return psf->sf_count[MCAST_INCLUDE] != 0; 252 case IGMPV3_CHANGE_TO_EXCLUDE: 253 if (gdeleted || sdeleted) 254 return 0; 255 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 256 psf->sf_count[MCAST_INCLUDE]) 257 return 0; 258 return pmc->sfcount[MCAST_EXCLUDE] == 259 psf->sf_count[MCAST_EXCLUDE]; 260 case IGMPV3_ALLOW_NEW_SOURCES: 261 if (gdeleted || !psf->sf_crcount) 262 return 0; 263 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 264 case IGMPV3_BLOCK_OLD_SOURCES: 265 if (pmc->sfmode == MCAST_INCLUDE) 266 return gdeleted || (psf->sf_crcount && sdeleted); 267 return psf->sf_crcount && !gdeleted && !sdeleted; 268 } 269 return 0; 270 } 271 272 static int 273 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 274 { 275 struct ip_sf_list *psf; 276 int scount = 0; 277 278 for (psf=pmc->sources; psf; psf=psf->sf_next) { 279 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 280 continue; 281 scount++; 282 } 283 return scount; 284 } 285 286 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 287 { 288 struct sk_buff *skb; 289 struct rtable *rt; 290 struct iphdr *pip; 291 struct igmpv3_report *pig; 292 293 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 294 if (skb == NULL) 295 return NULL; 296 297 { 298 struct flowi fl = { .oif = dev->ifindex, 299 .nl_u = { .ip4_u = { 300 .daddr = IGMPV3_ALL_MCR } }, 301 .proto = IPPROTO_IGMP }; 302 if (ip_route_output_key(&init_net, &rt, &fl)) { 303 kfree_skb(skb); 304 return NULL; 305 } 306 } 307 if (rt->rt_src == 0) { 308 kfree_skb(skb); 309 ip_rt_put(rt); 310 return NULL; 311 } 312 313 skb->dst = &rt->u.dst; 314 skb->dev = dev; 315 316 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 317 318 skb_reset_network_header(skb); 319 pip = ip_hdr(skb); 320 skb_put(skb, sizeof(struct iphdr) + 4); 321 322 pip->version = 4; 323 pip->ihl = (sizeof(struct iphdr)+4)>>2; 324 pip->tos = 0xc0; 325 pip->frag_off = htons(IP_DF); 326 pip->ttl = 1; 327 pip->daddr = rt->rt_dst; 328 pip->saddr = rt->rt_src; 329 pip->protocol = IPPROTO_IGMP; 330 pip->tot_len = 0; /* filled in later */ 331 ip_select_ident(pip, &rt->u.dst, NULL); 332 ((u8*)&pip[1])[0] = IPOPT_RA; 333 ((u8*)&pip[1])[1] = 4; 334 ((u8*)&pip[1])[2] = 0; 335 ((u8*)&pip[1])[3] = 0; 336 337 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 338 skb_put(skb, sizeof(*pig)); 339 pig = igmpv3_report_hdr(skb); 340 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 341 pig->resv1 = 0; 342 pig->csum = 0; 343 pig->resv2 = 0; 344 pig->ngrec = 0; 345 return skb; 346 } 347 348 static int igmpv3_sendpack(struct sk_buff *skb) 349 { 350 struct igmphdr *pig = igmp_hdr(skb); 351 const int igmplen = skb->tail - skb->transport_header; 352 353 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 354 355 return ip_local_out(skb); 356 } 357 358 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 359 { 360 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 361 } 362 363 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 364 int type, struct igmpv3_grec **ppgr) 365 { 366 struct net_device *dev = pmc->interface->dev; 367 struct igmpv3_report *pih; 368 struct igmpv3_grec *pgr; 369 370 if (!skb) 371 skb = igmpv3_newpack(dev, dev->mtu); 372 if (!skb) 373 return NULL; 374 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 375 pgr->grec_type = type; 376 pgr->grec_auxwords = 0; 377 pgr->grec_nsrcs = 0; 378 pgr->grec_mca = pmc->multiaddr; 379 pih = igmpv3_report_hdr(skb); 380 pih->ngrec = htons(ntohs(pih->ngrec)+1); 381 *ppgr = pgr; 382 return skb; 383 } 384 385 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 386 skb_tailroom(skb)) : 0) 387 388 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 389 int type, int gdeleted, int sdeleted) 390 { 391 struct net_device *dev = pmc->interface->dev; 392 struct igmpv3_report *pih; 393 struct igmpv3_grec *pgr = NULL; 394 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 395 int scount, stotal, first, isquery, truncate; 396 397 if (pmc->multiaddr == IGMP_ALL_HOSTS) 398 return skb; 399 400 isquery = type == IGMPV3_MODE_IS_INCLUDE || 401 type == IGMPV3_MODE_IS_EXCLUDE; 402 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 403 type == IGMPV3_CHANGE_TO_EXCLUDE; 404 405 stotal = scount = 0; 406 407 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 408 409 if (!*psf_list) 410 goto empty_source; 411 412 pih = skb ? igmpv3_report_hdr(skb) : NULL; 413 414 /* EX and TO_EX get a fresh packet, if needed */ 415 if (truncate) { 416 if (pih && pih->ngrec && 417 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 418 if (skb) 419 igmpv3_sendpack(skb); 420 skb = igmpv3_newpack(dev, dev->mtu); 421 } 422 } 423 first = 1; 424 psf_prev = NULL; 425 for (psf=*psf_list; psf; psf=psf_next) { 426 __be32 *psrc; 427 428 psf_next = psf->sf_next; 429 430 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 431 psf_prev = psf; 432 continue; 433 } 434 435 /* clear marks on query responses */ 436 if (isquery) 437 psf->sf_gsresp = 0; 438 439 if (AVAILABLE(skb) < sizeof(__be32) + 440 first*sizeof(struct igmpv3_grec)) { 441 if (truncate && !first) 442 break; /* truncate these */ 443 if (pgr) 444 pgr->grec_nsrcs = htons(scount); 445 if (skb) 446 igmpv3_sendpack(skb); 447 skb = igmpv3_newpack(dev, dev->mtu); 448 first = 1; 449 scount = 0; 450 } 451 if (first) { 452 skb = add_grhead(skb, pmc, type, &pgr); 453 first = 0; 454 } 455 if (!skb) 456 return NULL; 457 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 458 *psrc = psf->sf_inaddr; 459 scount++; stotal++; 460 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 461 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 462 psf->sf_crcount--; 463 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 464 if (psf_prev) 465 psf_prev->sf_next = psf->sf_next; 466 else 467 *psf_list = psf->sf_next; 468 kfree(psf); 469 continue; 470 } 471 } 472 psf_prev = psf; 473 } 474 475 empty_source: 476 if (!stotal) { 477 if (type == IGMPV3_ALLOW_NEW_SOURCES || 478 type == IGMPV3_BLOCK_OLD_SOURCES) 479 return skb; 480 if (pmc->crcount || isquery) { 481 /* make sure we have room for group header */ 482 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 483 igmpv3_sendpack(skb); 484 skb = NULL; /* add_grhead will get a new one */ 485 } 486 skb = add_grhead(skb, pmc, type, &pgr); 487 } 488 } 489 if (pgr) 490 pgr->grec_nsrcs = htons(scount); 491 492 if (isquery) 493 pmc->gsquery = 0; /* clear query state on report */ 494 return skb; 495 } 496 497 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 498 { 499 struct sk_buff *skb = NULL; 500 int type; 501 502 if (!pmc) { 503 read_lock(&in_dev->mc_list_lock); 504 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 505 if (pmc->multiaddr == IGMP_ALL_HOSTS) 506 continue; 507 spin_lock_bh(&pmc->lock); 508 if (pmc->sfcount[MCAST_EXCLUDE]) 509 type = IGMPV3_MODE_IS_EXCLUDE; 510 else 511 type = IGMPV3_MODE_IS_INCLUDE; 512 skb = add_grec(skb, pmc, type, 0, 0); 513 spin_unlock_bh(&pmc->lock); 514 } 515 read_unlock(&in_dev->mc_list_lock); 516 } else { 517 spin_lock_bh(&pmc->lock); 518 if (pmc->sfcount[MCAST_EXCLUDE]) 519 type = IGMPV3_MODE_IS_EXCLUDE; 520 else 521 type = IGMPV3_MODE_IS_INCLUDE; 522 skb = add_grec(skb, pmc, type, 0, 0); 523 spin_unlock_bh(&pmc->lock); 524 } 525 if (!skb) 526 return 0; 527 return igmpv3_sendpack(skb); 528 } 529 530 /* 531 * remove zero-count source records from a source filter list 532 */ 533 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 534 { 535 struct ip_sf_list *psf_prev, *psf_next, *psf; 536 537 psf_prev = NULL; 538 for (psf=*ppsf; psf; psf = psf_next) { 539 psf_next = psf->sf_next; 540 if (psf->sf_crcount == 0) { 541 if (psf_prev) 542 psf_prev->sf_next = psf->sf_next; 543 else 544 *ppsf = psf->sf_next; 545 kfree(psf); 546 } else 547 psf_prev = psf; 548 } 549 } 550 551 static void igmpv3_send_cr(struct in_device *in_dev) 552 { 553 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 554 struct sk_buff *skb = NULL; 555 int type, dtype; 556 557 read_lock(&in_dev->mc_list_lock); 558 spin_lock_bh(&in_dev->mc_tomb_lock); 559 560 /* deleted MCA's */ 561 pmc_prev = NULL; 562 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 563 pmc_next = pmc->next; 564 if (pmc->sfmode == MCAST_INCLUDE) { 565 type = IGMPV3_BLOCK_OLD_SOURCES; 566 dtype = IGMPV3_BLOCK_OLD_SOURCES; 567 skb = add_grec(skb, pmc, type, 1, 0); 568 skb = add_grec(skb, pmc, dtype, 1, 1); 569 } 570 if (pmc->crcount) { 571 if (pmc->sfmode == MCAST_EXCLUDE) { 572 type = IGMPV3_CHANGE_TO_INCLUDE; 573 skb = add_grec(skb, pmc, type, 1, 0); 574 } 575 pmc->crcount--; 576 if (pmc->crcount == 0) { 577 igmpv3_clear_zeros(&pmc->tomb); 578 igmpv3_clear_zeros(&pmc->sources); 579 } 580 } 581 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 582 if (pmc_prev) 583 pmc_prev->next = pmc_next; 584 else 585 in_dev->mc_tomb = pmc_next; 586 in_dev_put(pmc->interface); 587 kfree(pmc); 588 } else 589 pmc_prev = pmc; 590 } 591 spin_unlock_bh(&in_dev->mc_tomb_lock); 592 593 /* change recs */ 594 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 595 spin_lock_bh(&pmc->lock); 596 if (pmc->sfcount[MCAST_EXCLUDE]) { 597 type = IGMPV3_BLOCK_OLD_SOURCES; 598 dtype = IGMPV3_ALLOW_NEW_SOURCES; 599 } else { 600 type = IGMPV3_ALLOW_NEW_SOURCES; 601 dtype = IGMPV3_BLOCK_OLD_SOURCES; 602 } 603 skb = add_grec(skb, pmc, type, 0, 0); 604 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 605 606 /* filter mode changes */ 607 if (pmc->crcount) { 608 if (pmc->sfmode == MCAST_EXCLUDE) 609 type = IGMPV3_CHANGE_TO_EXCLUDE; 610 else 611 type = IGMPV3_CHANGE_TO_INCLUDE; 612 skb = add_grec(skb, pmc, type, 0, 0); 613 pmc->crcount--; 614 } 615 spin_unlock_bh(&pmc->lock); 616 } 617 read_unlock(&in_dev->mc_list_lock); 618 619 if (!skb) 620 return; 621 (void) igmpv3_sendpack(skb); 622 } 623 624 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 625 int type) 626 { 627 struct sk_buff *skb; 628 struct iphdr *iph; 629 struct igmphdr *ih; 630 struct rtable *rt; 631 struct net_device *dev = in_dev->dev; 632 __be32 group = pmc ? pmc->multiaddr : 0; 633 __be32 dst; 634 635 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 636 return igmpv3_send_report(in_dev, pmc); 637 else if (type == IGMP_HOST_LEAVE_MESSAGE) 638 dst = IGMP_ALL_ROUTER; 639 else 640 dst = group; 641 642 { 643 struct flowi fl = { .oif = dev->ifindex, 644 .nl_u = { .ip4_u = { .daddr = dst } }, 645 .proto = IPPROTO_IGMP }; 646 if (ip_route_output_key(&init_net, &rt, &fl)) 647 return -1; 648 } 649 if (rt->rt_src == 0) { 650 ip_rt_put(rt); 651 return -1; 652 } 653 654 skb=alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 655 if (skb == NULL) { 656 ip_rt_put(rt); 657 return -1; 658 } 659 660 skb->dst = &rt->u.dst; 661 662 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 663 664 skb_reset_network_header(skb); 665 iph = ip_hdr(skb); 666 skb_put(skb, sizeof(struct iphdr) + 4); 667 668 iph->version = 4; 669 iph->ihl = (sizeof(struct iphdr)+4)>>2; 670 iph->tos = 0xc0; 671 iph->frag_off = htons(IP_DF); 672 iph->ttl = 1; 673 iph->daddr = dst; 674 iph->saddr = rt->rt_src; 675 iph->protocol = IPPROTO_IGMP; 676 ip_select_ident(iph, &rt->u.dst, NULL); 677 ((u8*)&iph[1])[0] = IPOPT_RA; 678 ((u8*)&iph[1])[1] = 4; 679 ((u8*)&iph[1])[2] = 0; 680 ((u8*)&iph[1])[3] = 0; 681 682 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 683 ih->type=type; 684 ih->code=0; 685 ih->csum=0; 686 ih->group=group; 687 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 688 689 return ip_local_out(skb); 690 } 691 692 static void igmp_gq_timer_expire(unsigned long data) 693 { 694 struct in_device *in_dev = (struct in_device *)data; 695 696 in_dev->mr_gq_running = 0; 697 igmpv3_send_report(in_dev, NULL); 698 __in_dev_put(in_dev); 699 } 700 701 static void igmp_ifc_timer_expire(unsigned long data) 702 { 703 struct in_device *in_dev = (struct in_device *)data; 704 705 igmpv3_send_cr(in_dev); 706 if (in_dev->mr_ifc_count) { 707 in_dev->mr_ifc_count--; 708 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 709 } 710 __in_dev_put(in_dev); 711 } 712 713 static void igmp_ifc_event(struct in_device *in_dev) 714 { 715 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 716 return; 717 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 718 IGMP_Unsolicited_Report_Count; 719 igmp_ifc_start_timer(in_dev, 1); 720 } 721 722 723 static void igmp_timer_expire(unsigned long data) 724 { 725 struct ip_mc_list *im=(struct ip_mc_list *)data; 726 struct in_device *in_dev = im->interface; 727 728 spin_lock(&im->lock); 729 im->tm_running=0; 730 731 if (im->unsolicit_count) { 732 im->unsolicit_count--; 733 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 734 } 735 im->reporter = 1; 736 spin_unlock(&im->lock); 737 738 if (IGMP_V1_SEEN(in_dev)) 739 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 740 else if (IGMP_V2_SEEN(in_dev)) 741 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 742 else 743 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 744 745 ip_ma_put(im); 746 } 747 748 /* mark EXCLUDE-mode sources */ 749 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 750 { 751 struct ip_sf_list *psf; 752 int i, scount; 753 754 scount = 0; 755 for (psf=pmc->sources; psf; psf=psf->sf_next) { 756 if (scount == nsrcs) 757 break; 758 for (i=0; i<nsrcs; i++) { 759 /* skip inactive filters */ 760 if (pmc->sfcount[MCAST_INCLUDE] || 761 pmc->sfcount[MCAST_EXCLUDE] != 762 psf->sf_count[MCAST_EXCLUDE]) 763 continue; 764 if (srcs[i] == psf->sf_inaddr) { 765 scount++; 766 break; 767 } 768 } 769 } 770 pmc->gsquery = 0; 771 if (scount == nsrcs) /* all sources excluded */ 772 return 0; 773 return 1; 774 } 775 776 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 777 { 778 struct ip_sf_list *psf; 779 int i, scount; 780 781 if (pmc->sfmode == MCAST_EXCLUDE) 782 return igmp_xmarksources(pmc, nsrcs, srcs); 783 784 /* mark INCLUDE-mode sources */ 785 scount = 0; 786 for (psf=pmc->sources; psf; psf=psf->sf_next) { 787 if (scount == nsrcs) 788 break; 789 for (i=0; i<nsrcs; i++) 790 if (srcs[i] == psf->sf_inaddr) { 791 psf->sf_gsresp = 1; 792 scount++; 793 break; 794 } 795 } 796 if (!scount) { 797 pmc->gsquery = 0; 798 return 0; 799 } 800 pmc->gsquery = 1; 801 return 1; 802 } 803 804 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 805 { 806 struct ip_mc_list *im; 807 808 /* Timers are only set for non-local groups */ 809 810 if (group == IGMP_ALL_HOSTS) 811 return; 812 813 read_lock(&in_dev->mc_list_lock); 814 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 815 if (im->multiaddr == group) { 816 igmp_stop_timer(im); 817 break; 818 } 819 } 820 read_unlock(&in_dev->mc_list_lock); 821 } 822 823 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 824 int len) 825 { 826 struct igmphdr *ih = igmp_hdr(skb); 827 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 828 struct ip_mc_list *im; 829 __be32 group = ih->group; 830 int max_delay; 831 int mark = 0; 832 833 834 if (len == 8) { 835 if (ih->code == 0) { 836 /* Alas, old v1 router presents here. */ 837 838 max_delay = IGMP_Query_Response_Interval; 839 in_dev->mr_v1_seen = jiffies + 840 IGMP_V1_Router_Present_Timeout; 841 group = 0; 842 } else { 843 /* v2 router present */ 844 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 845 in_dev->mr_v2_seen = jiffies + 846 IGMP_V2_Router_Present_Timeout; 847 } 848 /* cancel the interface change timer */ 849 in_dev->mr_ifc_count = 0; 850 if (del_timer(&in_dev->mr_ifc_timer)) 851 __in_dev_put(in_dev); 852 /* clear deleted report items */ 853 igmpv3_clear_delrec(in_dev); 854 } else if (len < 12) { 855 return; /* ignore bogus packet; freed by caller */ 856 } else { /* v3 */ 857 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 858 return; 859 860 ih3 = igmpv3_query_hdr(skb); 861 if (ih3->nsrcs) { 862 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 863 + ntohs(ih3->nsrcs)*sizeof(__be32))) 864 return; 865 ih3 = igmpv3_query_hdr(skb); 866 } 867 868 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 869 if (!max_delay) 870 max_delay = 1; /* can't mod w/ 0 */ 871 in_dev->mr_maxdelay = max_delay; 872 if (ih3->qrv) 873 in_dev->mr_qrv = ih3->qrv; 874 if (!group) { /* general query */ 875 if (ih3->nsrcs) 876 return; /* no sources allowed */ 877 igmp_gq_start_timer(in_dev); 878 return; 879 } 880 /* mark sources to include, if group & source-specific */ 881 mark = ih3->nsrcs != 0; 882 } 883 884 /* 885 * - Start the timers in all of our membership records 886 * that the query applies to for the interface on 887 * which the query arrived excl. those that belong 888 * to a "local" group (224.0.0.X) 889 * - For timers already running check if they need to 890 * be reset. 891 * - Use the igmp->igmp_code field as the maximum 892 * delay possible 893 */ 894 read_lock(&in_dev->mc_list_lock); 895 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 896 int changed; 897 898 if (group && group != im->multiaddr) 899 continue; 900 if (im->multiaddr == IGMP_ALL_HOSTS) 901 continue; 902 spin_lock_bh(&im->lock); 903 if (im->tm_running) 904 im->gsquery = im->gsquery && mark; 905 else 906 im->gsquery = mark; 907 changed = !im->gsquery || 908 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 909 spin_unlock_bh(&im->lock); 910 if (changed) 911 igmp_mod_timer(im, max_delay); 912 } 913 read_unlock(&in_dev->mc_list_lock); 914 } 915 916 int igmp_rcv(struct sk_buff *skb) 917 { 918 /* This basically follows the spec line by line -- see RFC1112 */ 919 struct igmphdr *ih; 920 struct in_device *in_dev = in_dev_get(skb->dev); 921 int len = skb->len; 922 923 if (in_dev == NULL) 924 goto drop; 925 926 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 927 goto drop_ref; 928 929 switch (skb->ip_summed) { 930 case CHECKSUM_COMPLETE: 931 if (!csum_fold(skb->csum)) 932 break; 933 /* fall through */ 934 case CHECKSUM_NONE: 935 skb->csum = 0; 936 if (__skb_checksum_complete(skb)) 937 goto drop_ref; 938 } 939 940 ih = igmp_hdr(skb); 941 switch (ih->type) { 942 case IGMP_HOST_MEMBERSHIP_QUERY: 943 igmp_heard_query(in_dev, skb, len); 944 break; 945 case IGMP_HOST_MEMBERSHIP_REPORT: 946 case IGMPV2_HOST_MEMBERSHIP_REPORT: 947 case IGMPV3_HOST_MEMBERSHIP_REPORT: 948 /* Is it our report looped back? */ 949 if (skb->rtable->fl.iif == 0) 950 break; 951 /* don't rely on MC router hearing unicast reports */ 952 if (skb->pkt_type == PACKET_MULTICAST || 953 skb->pkt_type == PACKET_BROADCAST) 954 igmp_heard_report(in_dev, ih->group); 955 break; 956 case IGMP_PIM: 957 #ifdef CONFIG_IP_PIMSM_V1 958 in_dev_put(in_dev); 959 return pim_rcv_v1(skb); 960 #endif 961 case IGMP_DVMRP: 962 case IGMP_TRACE: 963 case IGMP_HOST_LEAVE_MESSAGE: 964 case IGMP_MTRACE: 965 case IGMP_MTRACE_RESP: 966 break; 967 default: 968 break; 969 } 970 971 drop_ref: 972 in_dev_put(in_dev); 973 drop: 974 kfree_skb(skb); 975 return 0; 976 } 977 978 #endif 979 980 981 /* 982 * Add a filter to a device 983 */ 984 985 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 986 { 987 char buf[MAX_ADDR_LEN]; 988 struct net_device *dev = in_dev->dev; 989 990 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 991 We will get multicast token leakage, when IFF_MULTICAST 992 is changed. This check should be done in dev->set_multicast_list 993 routine. Something sort of: 994 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 995 --ANK 996 */ 997 if (arp_mc_map(addr, buf, dev, 0) == 0) 998 dev_mc_add(dev,buf,dev->addr_len,0); 999 } 1000 1001 /* 1002 * Remove a filter from a device 1003 */ 1004 1005 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1006 { 1007 char buf[MAX_ADDR_LEN]; 1008 struct net_device *dev = in_dev->dev; 1009 1010 if (arp_mc_map(addr, buf, dev, 0) == 0) 1011 dev_mc_delete(dev,buf,dev->addr_len,0); 1012 } 1013 1014 #ifdef CONFIG_IP_MULTICAST 1015 /* 1016 * deleted ip_mc_list manipulation 1017 */ 1018 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1019 { 1020 struct ip_mc_list *pmc; 1021 1022 /* this is an "ip_mc_list" for convenience; only the fields below 1023 * are actually used. In particular, the refcnt and users are not 1024 * used for management of the delete list. Using the same structure 1025 * for deleted items allows change reports to use common code with 1026 * non-deleted or query-response MCA's. 1027 */ 1028 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1029 if (!pmc) 1030 return; 1031 spin_lock_bh(&im->lock); 1032 pmc->interface = im->interface; 1033 in_dev_hold(in_dev); 1034 pmc->multiaddr = im->multiaddr; 1035 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1036 IGMP_Unsolicited_Report_Count; 1037 pmc->sfmode = im->sfmode; 1038 if (pmc->sfmode == MCAST_INCLUDE) { 1039 struct ip_sf_list *psf; 1040 1041 pmc->tomb = im->tomb; 1042 pmc->sources = im->sources; 1043 im->tomb = im->sources = NULL; 1044 for (psf=pmc->sources; psf; psf=psf->sf_next) 1045 psf->sf_crcount = pmc->crcount; 1046 } 1047 spin_unlock_bh(&im->lock); 1048 1049 spin_lock_bh(&in_dev->mc_tomb_lock); 1050 pmc->next = in_dev->mc_tomb; 1051 in_dev->mc_tomb = pmc; 1052 spin_unlock_bh(&in_dev->mc_tomb_lock); 1053 } 1054 1055 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1056 { 1057 struct ip_mc_list *pmc, *pmc_prev; 1058 struct ip_sf_list *psf, *psf_next; 1059 1060 spin_lock_bh(&in_dev->mc_tomb_lock); 1061 pmc_prev = NULL; 1062 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1063 if (pmc->multiaddr == multiaddr) 1064 break; 1065 pmc_prev = pmc; 1066 } 1067 if (pmc) { 1068 if (pmc_prev) 1069 pmc_prev->next = pmc->next; 1070 else 1071 in_dev->mc_tomb = pmc->next; 1072 } 1073 spin_unlock_bh(&in_dev->mc_tomb_lock); 1074 if (pmc) { 1075 for (psf=pmc->tomb; psf; psf=psf_next) { 1076 psf_next = psf->sf_next; 1077 kfree(psf); 1078 } 1079 in_dev_put(pmc->interface); 1080 kfree(pmc); 1081 } 1082 } 1083 1084 static void igmpv3_clear_delrec(struct in_device *in_dev) 1085 { 1086 struct ip_mc_list *pmc, *nextpmc; 1087 1088 spin_lock_bh(&in_dev->mc_tomb_lock); 1089 pmc = in_dev->mc_tomb; 1090 in_dev->mc_tomb = NULL; 1091 spin_unlock_bh(&in_dev->mc_tomb_lock); 1092 1093 for (; pmc; pmc = nextpmc) { 1094 nextpmc = pmc->next; 1095 ip_mc_clear_src(pmc); 1096 in_dev_put(pmc->interface); 1097 kfree(pmc); 1098 } 1099 /* clear dead sources, too */ 1100 read_lock(&in_dev->mc_list_lock); 1101 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1102 struct ip_sf_list *psf, *psf_next; 1103 1104 spin_lock_bh(&pmc->lock); 1105 psf = pmc->tomb; 1106 pmc->tomb = NULL; 1107 spin_unlock_bh(&pmc->lock); 1108 for (; psf; psf=psf_next) { 1109 psf_next = psf->sf_next; 1110 kfree(psf); 1111 } 1112 } 1113 read_unlock(&in_dev->mc_list_lock); 1114 } 1115 #endif 1116 1117 static void igmp_group_dropped(struct ip_mc_list *im) 1118 { 1119 struct in_device *in_dev = im->interface; 1120 #ifdef CONFIG_IP_MULTICAST 1121 int reporter; 1122 #endif 1123 1124 if (im->loaded) { 1125 im->loaded = 0; 1126 ip_mc_filter_del(in_dev, im->multiaddr); 1127 } 1128 1129 #ifdef CONFIG_IP_MULTICAST 1130 if (im->multiaddr == IGMP_ALL_HOSTS) 1131 return; 1132 1133 reporter = im->reporter; 1134 igmp_stop_timer(im); 1135 1136 if (!in_dev->dead) { 1137 if (IGMP_V1_SEEN(in_dev)) 1138 goto done; 1139 if (IGMP_V2_SEEN(in_dev)) { 1140 if (reporter) 1141 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1142 goto done; 1143 } 1144 /* IGMPv3 */ 1145 igmpv3_add_delrec(in_dev, im); 1146 1147 igmp_ifc_event(in_dev); 1148 } 1149 done: 1150 #endif 1151 ip_mc_clear_src(im); 1152 } 1153 1154 static void igmp_group_added(struct ip_mc_list *im) 1155 { 1156 struct in_device *in_dev = im->interface; 1157 1158 if (im->loaded == 0) { 1159 im->loaded = 1; 1160 ip_mc_filter_add(in_dev, im->multiaddr); 1161 } 1162 1163 #ifdef CONFIG_IP_MULTICAST 1164 if (im->multiaddr == IGMP_ALL_HOSTS) 1165 return; 1166 1167 if (in_dev->dead) 1168 return; 1169 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1170 spin_lock_bh(&im->lock); 1171 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1172 spin_unlock_bh(&im->lock); 1173 return; 1174 } 1175 /* else, v3 */ 1176 1177 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1178 IGMP_Unsolicited_Report_Count; 1179 igmp_ifc_event(in_dev); 1180 #endif 1181 } 1182 1183 1184 /* 1185 * Multicast list managers 1186 */ 1187 1188 1189 /* 1190 * A socket has joined a multicast group on device dev. 1191 */ 1192 1193 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1194 { 1195 struct ip_mc_list *im; 1196 1197 ASSERT_RTNL(); 1198 1199 if (!net_eq(dev_net(in_dev->dev), &init_net)) 1200 return; 1201 1202 for (im=in_dev->mc_list; im; im=im->next) { 1203 if (im->multiaddr == addr) { 1204 im->users++; 1205 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1206 goto out; 1207 } 1208 } 1209 1210 im = kmalloc(sizeof(*im), GFP_KERNEL); 1211 if (!im) 1212 goto out; 1213 1214 im->users=1; 1215 im->interface=in_dev; 1216 in_dev_hold(in_dev); 1217 im->multiaddr=addr; 1218 /* initial mode is (EX, empty) */ 1219 im->sfmode = MCAST_EXCLUDE; 1220 im->sfcount[MCAST_INCLUDE] = 0; 1221 im->sfcount[MCAST_EXCLUDE] = 1; 1222 im->sources = NULL; 1223 im->tomb = NULL; 1224 im->crcount = 0; 1225 atomic_set(&im->refcnt, 1); 1226 spin_lock_init(&im->lock); 1227 #ifdef CONFIG_IP_MULTICAST 1228 im->tm_running=0; 1229 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1230 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1231 im->reporter = 0; 1232 im->gsquery = 0; 1233 #endif 1234 im->loaded = 0; 1235 write_lock_bh(&in_dev->mc_list_lock); 1236 im->next=in_dev->mc_list; 1237 in_dev->mc_list=im; 1238 write_unlock_bh(&in_dev->mc_list_lock); 1239 #ifdef CONFIG_IP_MULTICAST 1240 igmpv3_del_delrec(in_dev, im->multiaddr); 1241 #endif 1242 igmp_group_added(im); 1243 if (!in_dev->dead) 1244 ip_rt_multicast_event(in_dev); 1245 out: 1246 return; 1247 } 1248 1249 /* 1250 * Resend IGMP JOIN report; used for bonding. 1251 */ 1252 void ip_mc_rejoin_group(struct ip_mc_list *im) 1253 { 1254 #ifdef CONFIG_IP_MULTICAST 1255 struct in_device *in_dev = im->interface; 1256 1257 if (im->multiaddr == IGMP_ALL_HOSTS) 1258 return; 1259 1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1262 return; 1263 } 1264 /* else, v3 */ 1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1266 IGMP_Unsolicited_Report_Count; 1267 igmp_ifc_event(in_dev); 1268 #endif 1269 } 1270 1271 /* 1272 * A socket has left a multicast group on device dev 1273 */ 1274 1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1276 { 1277 struct ip_mc_list *i, **ip; 1278 1279 ASSERT_RTNL(); 1280 1281 if (!net_eq(dev_net(in_dev->dev), &init_net)) 1282 return; 1283 1284 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1285 if (i->multiaddr==addr) { 1286 if (--i->users == 0) { 1287 write_lock_bh(&in_dev->mc_list_lock); 1288 *ip = i->next; 1289 write_unlock_bh(&in_dev->mc_list_lock); 1290 igmp_group_dropped(i); 1291 1292 if (!in_dev->dead) 1293 ip_rt_multicast_event(in_dev); 1294 1295 ip_ma_put(i); 1296 return; 1297 } 1298 break; 1299 } 1300 } 1301 } 1302 1303 /* Device going down */ 1304 1305 void ip_mc_down(struct in_device *in_dev) 1306 { 1307 struct ip_mc_list *i; 1308 1309 ASSERT_RTNL(); 1310 1311 if (!net_eq(dev_net(in_dev->dev), &init_net)) 1312 return; 1313 1314 for (i=in_dev->mc_list; i; i=i->next) 1315 igmp_group_dropped(i); 1316 1317 #ifdef CONFIG_IP_MULTICAST 1318 in_dev->mr_ifc_count = 0; 1319 if (del_timer(&in_dev->mr_ifc_timer)) 1320 __in_dev_put(in_dev); 1321 in_dev->mr_gq_running = 0; 1322 if (del_timer(&in_dev->mr_gq_timer)) 1323 __in_dev_put(in_dev); 1324 igmpv3_clear_delrec(in_dev); 1325 #endif 1326 1327 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1328 } 1329 1330 void ip_mc_init_dev(struct in_device *in_dev) 1331 { 1332 ASSERT_RTNL(); 1333 1334 if (!net_eq(dev_net(in_dev->dev), &init_net)) 1335 return; 1336 1337 in_dev->mc_tomb = NULL; 1338 #ifdef CONFIG_IP_MULTICAST 1339 in_dev->mr_gq_running = 0; 1340 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1341 (unsigned long)in_dev); 1342 in_dev->mr_ifc_count = 0; 1343 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1344 (unsigned long)in_dev); 1345 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1346 #endif 1347 1348 rwlock_init(&in_dev->mc_list_lock); 1349 spin_lock_init(&in_dev->mc_tomb_lock); 1350 } 1351 1352 /* Device going up */ 1353 1354 void ip_mc_up(struct in_device *in_dev) 1355 { 1356 struct ip_mc_list *i; 1357 1358 ASSERT_RTNL(); 1359 1360 if (!net_eq(dev_net(in_dev->dev), &init_net)) 1361 return; 1362 1363 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1364 1365 for (i=in_dev->mc_list; i; i=i->next) 1366 igmp_group_added(i); 1367 } 1368 1369 /* 1370 * Device is about to be destroyed: clean up. 1371 */ 1372 1373 void ip_mc_destroy_dev(struct in_device *in_dev) 1374 { 1375 struct ip_mc_list *i; 1376 1377 ASSERT_RTNL(); 1378 1379 if (!net_eq(dev_net(in_dev->dev), &init_net)) 1380 return; 1381 1382 /* Deactivate timers */ 1383 ip_mc_down(in_dev); 1384 1385 write_lock_bh(&in_dev->mc_list_lock); 1386 while ((i = in_dev->mc_list) != NULL) { 1387 in_dev->mc_list = i->next; 1388 write_unlock_bh(&in_dev->mc_list_lock); 1389 1390 igmp_group_dropped(i); 1391 ip_ma_put(i); 1392 1393 write_lock_bh(&in_dev->mc_list_lock); 1394 } 1395 write_unlock_bh(&in_dev->mc_list_lock); 1396 } 1397 1398 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1399 { 1400 struct flowi fl = { .nl_u = { .ip4_u = 1401 { .daddr = imr->imr_multiaddr.s_addr } } }; 1402 struct rtable *rt; 1403 struct net_device *dev = NULL; 1404 struct in_device *idev = NULL; 1405 1406 if (imr->imr_ifindex) { 1407 idev = inetdev_by_index(&init_net, imr->imr_ifindex); 1408 if (idev) 1409 __in_dev_put(idev); 1410 return idev; 1411 } 1412 if (imr->imr_address.s_addr) { 1413 dev = ip_dev_find(&init_net, imr->imr_address.s_addr); 1414 if (!dev) 1415 return NULL; 1416 dev_put(dev); 1417 } 1418 1419 if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) { 1420 dev = rt->u.dst.dev; 1421 ip_rt_put(rt); 1422 } 1423 if (dev) { 1424 imr->imr_ifindex = dev->ifindex; 1425 idev = __in_dev_get_rtnl(dev); 1426 } 1427 return idev; 1428 } 1429 1430 /* 1431 * Join a socket to a group 1432 */ 1433 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1434 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1435 1436 1437 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1438 __be32 *psfsrc) 1439 { 1440 struct ip_sf_list *psf, *psf_prev; 1441 int rv = 0; 1442 1443 psf_prev = NULL; 1444 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1445 if (psf->sf_inaddr == *psfsrc) 1446 break; 1447 psf_prev = psf; 1448 } 1449 if (!psf || psf->sf_count[sfmode] == 0) { 1450 /* source filter not found, or count wrong => bug */ 1451 return -ESRCH; 1452 } 1453 psf->sf_count[sfmode]--; 1454 if (psf->sf_count[sfmode] == 0) { 1455 ip_rt_multicast_event(pmc->interface); 1456 } 1457 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1458 #ifdef CONFIG_IP_MULTICAST 1459 struct in_device *in_dev = pmc->interface; 1460 #endif 1461 1462 /* no more filters for this source */ 1463 if (psf_prev) 1464 psf_prev->sf_next = psf->sf_next; 1465 else 1466 pmc->sources = psf->sf_next; 1467 #ifdef CONFIG_IP_MULTICAST 1468 if (psf->sf_oldin && 1469 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1470 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1471 IGMP_Unsolicited_Report_Count; 1472 psf->sf_next = pmc->tomb; 1473 pmc->tomb = psf; 1474 rv = 1; 1475 } else 1476 #endif 1477 kfree(psf); 1478 } 1479 return rv; 1480 } 1481 1482 #ifndef CONFIG_IP_MULTICAST 1483 #define igmp_ifc_event(x) do { } while (0) 1484 #endif 1485 1486 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1487 int sfcount, __be32 *psfsrc, int delta) 1488 { 1489 struct ip_mc_list *pmc; 1490 int changerec = 0; 1491 int i, err; 1492 1493 if (!in_dev) 1494 return -ENODEV; 1495 read_lock(&in_dev->mc_list_lock); 1496 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1497 if (*pmca == pmc->multiaddr) 1498 break; 1499 } 1500 if (!pmc) { 1501 /* MCA not found?? bug */ 1502 read_unlock(&in_dev->mc_list_lock); 1503 return -ESRCH; 1504 } 1505 spin_lock_bh(&pmc->lock); 1506 read_unlock(&in_dev->mc_list_lock); 1507 #ifdef CONFIG_IP_MULTICAST 1508 sf_markstate(pmc); 1509 #endif 1510 if (!delta) { 1511 err = -EINVAL; 1512 if (!pmc->sfcount[sfmode]) 1513 goto out_unlock; 1514 pmc->sfcount[sfmode]--; 1515 } 1516 err = 0; 1517 for (i=0; i<sfcount; i++) { 1518 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1519 1520 changerec |= rv > 0; 1521 if (!err && rv < 0) 1522 err = rv; 1523 } 1524 if (pmc->sfmode == MCAST_EXCLUDE && 1525 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1526 pmc->sfcount[MCAST_INCLUDE]) { 1527 #ifdef CONFIG_IP_MULTICAST 1528 struct ip_sf_list *psf; 1529 #endif 1530 1531 /* filter mode change */ 1532 pmc->sfmode = MCAST_INCLUDE; 1533 #ifdef CONFIG_IP_MULTICAST 1534 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1535 IGMP_Unsolicited_Report_Count; 1536 in_dev->mr_ifc_count = pmc->crcount; 1537 for (psf=pmc->sources; psf; psf = psf->sf_next) 1538 psf->sf_crcount = 0; 1539 igmp_ifc_event(pmc->interface); 1540 } else if (sf_setstate(pmc) || changerec) { 1541 igmp_ifc_event(pmc->interface); 1542 #endif 1543 } 1544 out_unlock: 1545 spin_unlock_bh(&pmc->lock); 1546 return err; 1547 } 1548 1549 /* 1550 * Add multicast single-source filter to the interface list 1551 */ 1552 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1553 __be32 *psfsrc, int delta) 1554 { 1555 struct ip_sf_list *psf, *psf_prev; 1556 1557 psf_prev = NULL; 1558 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1559 if (psf->sf_inaddr == *psfsrc) 1560 break; 1561 psf_prev = psf; 1562 } 1563 if (!psf) { 1564 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1565 if (!psf) 1566 return -ENOBUFS; 1567 psf->sf_inaddr = *psfsrc; 1568 if (psf_prev) { 1569 psf_prev->sf_next = psf; 1570 } else 1571 pmc->sources = psf; 1572 } 1573 psf->sf_count[sfmode]++; 1574 if (psf->sf_count[sfmode] == 1) { 1575 ip_rt_multicast_event(pmc->interface); 1576 } 1577 return 0; 1578 } 1579 1580 #ifdef CONFIG_IP_MULTICAST 1581 static void sf_markstate(struct ip_mc_list *pmc) 1582 { 1583 struct ip_sf_list *psf; 1584 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1585 1586 for (psf=pmc->sources; psf; psf=psf->sf_next) 1587 if (pmc->sfcount[MCAST_EXCLUDE]) { 1588 psf->sf_oldin = mca_xcount == 1589 psf->sf_count[MCAST_EXCLUDE] && 1590 !psf->sf_count[MCAST_INCLUDE]; 1591 } else 1592 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1593 } 1594 1595 static int sf_setstate(struct ip_mc_list *pmc) 1596 { 1597 struct ip_sf_list *psf, *dpsf; 1598 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1599 int qrv = pmc->interface->mr_qrv; 1600 int new_in, rv; 1601 1602 rv = 0; 1603 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1604 if (pmc->sfcount[MCAST_EXCLUDE]) { 1605 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1606 !psf->sf_count[MCAST_INCLUDE]; 1607 } else 1608 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1609 if (new_in) { 1610 if (!psf->sf_oldin) { 1611 struct ip_sf_list *prev = NULL; 1612 1613 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1614 if (dpsf->sf_inaddr == psf->sf_inaddr) 1615 break; 1616 prev = dpsf; 1617 } 1618 if (dpsf) { 1619 if (prev) 1620 prev->sf_next = dpsf->sf_next; 1621 else 1622 pmc->tomb = dpsf->sf_next; 1623 kfree(dpsf); 1624 } 1625 psf->sf_crcount = qrv; 1626 rv++; 1627 } 1628 } else if (psf->sf_oldin) { 1629 1630 psf->sf_crcount = 0; 1631 /* 1632 * add or update "delete" records if an active filter 1633 * is now inactive 1634 */ 1635 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1636 if (dpsf->sf_inaddr == psf->sf_inaddr) 1637 break; 1638 if (!dpsf) { 1639 dpsf = (struct ip_sf_list *) 1640 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1641 if (!dpsf) 1642 continue; 1643 *dpsf = *psf; 1644 /* pmc->lock held by callers */ 1645 dpsf->sf_next = pmc->tomb; 1646 pmc->tomb = dpsf; 1647 } 1648 dpsf->sf_crcount = qrv; 1649 rv++; 1650 } 1651 } 1652 return rv; 1653 } 1654 #endif 1655 1656 /* 1657 * Add multicast source filter list to the interface list 1658 */ 1659 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1660 int sfcount, __be32 *psfsrc, int delta) 1661 { 1662 struct ip_mc_list *pmc; 1663 int isexclude; 1664 int i, err; 1665 1666 if (!in_dev) 1667 return -ENODEV; 1668 read_lock(&in_dev->mc_list_lock); 1669 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1670 if (*pmca == pmc->multiaddr) 1671 break; 1672 } 1673 if (!pmc) { 1674 /* MCA not found?? bug */ 1675 read_unlock(&in_dev->mc_list_lock); 1676 return -ESRCH; 1677 } 1678 spin_lock_bh(&pmc->lock); 1679 read_unlock(&in_dev->mc_list_lock); 1680 1681 #ifdef CONFIG_IP_MULTICAST 1682 sf_markstate(pmc); 1683 #endif 1684 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1685 if (!delta) 1686 pmc->sfcount[sfmode]++; 1687 err = 0; 1688 for (i=0; i<sfcount; i++) { 1689 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1690 if (err) 1691 break; 1692 } 1693 if (err) { 1694 int j; 1695 1696 pmc->sfcount[sfmode]--; 1697 for (j=0; j<i; j++) 1698 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1699 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1700 #ifdef CONFIG_IP_MULTICAST 1701 struct ip_sf_list *psf; 1702 in_dev = pmc->interface; 1703 #endif 1704 1705 /* filter mode change */ 1706 if (pmc->sfcount[MCAST_EXCLUDE]) 1707 pmc->sfmode = MCAST_EXCLUDE; 1708 else if (pmc->sfcount[MCAST_INCLUDE]) 1709 pmc->sfmode = MCAST_INCLUDE; 1710 #ifdef CONFIG_IP_MULTICAST 1711 /* else no filters; keep old mode for reports */ 1712 1713 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1714 IGMP_Unsolicited_Report_Count; 1715 in_dev->mr_ifc_count = pmc->crcount; 1716 for (psf=pmc->sources; psf; psf = psf->sf_next) 1717 psf->sf_crcount = 0; 1718 igmp_ifc_event(in_dev); 1719 } else if (sf_setstate(pmc)) { 1720 igmp_ifc_event(in_dev); 1721 #endif 1722 } 1723 spin_unlock_bh(&pmc->lock); 1724 return err; 1725 } 1726 1727 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1728 { 1729 struct ip_sf_list *psf, *nextpsf; 1730 1731 for (psf=pmc->tomb; psf; psf=nextpsf) { 1732 nextpsf = psf->sf_next; 1733 kfree(psf); 1734 } 1735 pmc->tomb = NULL; 1736 for (psf=pmc->sources; psf; psf=nextpsf) { 1737 nextpsf = psf->sf_next; 1738 kfree(psf); 1739 } 1740 pmc->sources = NULL; 1741 pmc->sfmode = MCAST_EXCLUDE; 1742 pmc->sfcount[MCAST_INCLUDE] = 0; 1743 pmc->sfcount[MCAST_EXCLUDE] = 1; 1744 } 1745 1746 1747 /* 1748 * Join a multicast group 1749 */ 1750 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1751 { 1752 int err; 1753 __be32 addr = imr->imr_multiaddr.s_addr; 1754 struct ip_mc_socklist *iml=NULL, *i; 1755 struct in_device *in_dev; 1756 struct inet_sock *inet = inet_sk(sk); 1757 int ifindex; 1758 int count = 0; 1759 1760 if (!ipv4_is_multicast(addr)) 1761 return -EINVAL; 1762 1763 if (!net_eq(sock_net(sk), &init_net)) 1764 return -EPROTONOSUPPORT; 1765 1766 rtnl_lock(); 1767 1768 in_dev = ip_mc_find_dev(imr); 1769 1770 if (!in_dev) { 1771 iml = NULL; 1772 err = -ENODEV; 1773 goto done; 1774 } 1775 1776 err = -EADDRINUSE; 1777 ifindex = imr->imr_ifindex; 1778 for (i = inet->mc_list; i; i = i->next) { 1779 if (i->multi.imr_multiaddr.s_addr == addr && 1780 i->multi.imr_ifindex == ifindex) 1781 goto done; 1782 count++; 1783 } 1784 err = -ENOBUFS; 1785 if (count >= sysctl_igmp_max_memberships) 1786 goto done; 1787 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1788 if (iml == NULL) 1789 goto done; 1790 1791 memcpy(&iml->multi, imr, sizeof(*imr)); 1792 iml->next = inet->mc_list; 1793 iml->sflist = NULL; 1794 iml->sfmode = MCAST_EXCLUDE; 1795 inet->mc_list = iml; 1796 ip_mc_inc_group(in_dev, addr); 1797 err = 0; 1798 done: 1799 rtnl_unlock(); 1800 return err; 1801 } 1802 1803 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1804 struct in_device *in_dev) 1805 { 1806 int err; 1807 1808 if (iml->sflist == NULL) { 1809 /* any-source empty exclude case */ 1810 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1811 iml->sfmode, 0, NULL, 0); 1812 } 1813 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1814 iml->sfmode, iml->sflist->sl_count, 1815 iml->sflist->sl_addr, 0); 1816 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1817 iml->sflist = NULL; 1818 return err; 1819 } 1820 1821 /* 1822 * Ask a socket to leave a group. 1823 */ 1824 1825 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1826 { 1827 struct inet_sock *inet = inet_sk(sk); 1828 struct ip_mc_socklist *iml, **imlp; 1829 struct in_device *in_dev; 1830 __be32 group = imr->imr_multiaddr.s_addr; 1831 u32 ifindex; 1832 int ret = -EADDRNOTAVAIL; 1833 1834 if (!net_eq(sock_net(sk), &init_net)) 1835 return -EPROTONOSUPPORT; 1836 1837 rtnl_lock(); 1838 in_dev = ip_mc_find_dev(imr); 1839 ifindex = imr->imr_ifindex; 1840 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1841 if (iml->multi.imr_multiaddr.s_addr != group) 1842 continue; 1843 if (ifindex) { 1844 if (iml->multi.imr_ifindex != ifindex) 1845 continue; 1846 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1847 iml->multi.imr_address.s_addr) 1848 continue; 1849 1850 (void) ip_mc_leave_src(sk, iml, in_dev); 1851 1852 *imlp = iml->next; 1853 1854 if (in_dev) 1855 ip_mc_dec_group(in_dev, group); 1856 rtnl_unlock(); 1857 sock_kfree_s(sk, iml, sizeof(*iml)); 1858 return 0; 1859 } 1860 if (!in_dev) 1861 ret = -ENODEV; 1862 rtnl_unlock(); 1863 return ret; 1864 } 1865 1866 int ip_mc_source(int add, int omode, struct sock *sk, struct 1867 ip_mreq_source *mreqs, int ifindex) 1868 { 1869 int err; 1870 struct ip_mreqn imr; 1871 __be32 addr = mreqs->imr_multiaddr; 1872 struct ip_mc_socklist *pmc; 1873 struct in_device *in_dev = NULL; 1874 struct inet_sock *inet = inet_sk(sk); 1875 struct ip_sf_socklist *psl; 1876 int leavegroup = 0; 1877 int i, j, rv; 1878 1879 if (!ipv4_is_multicast(addr)) 1880 return -EINVAL; 1881 1882 if (!net_eq(sock_net(sk), &init_net)) 1883 return -EPROTONOSUPPORT; 1884 1885 rtnl_lock(); 1886 1887 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1888 imr.imr_address.s_addr = mreqs->imr_interface; 1889 imr.imr_ifindex = ifindex; 1890 in_dev = ip_mc_find_dev(&imr); 1891 1892 if (!in_dev) { 1893 err = -ENODEV; 1894 goto done; 1895 } 1896 err = -EADDRNOTAVAIL; 1897 1898 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1899 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1900 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1901 break; 1902 } 1903 if (!pmc) { /* must have a prior join */ 1904 err = -EINVAL; 1905 goto done; 1906 } 1907 /* if a source filter was set, must be the same mode as before */ 1908 if (pmc->sflist) { 1909 if (pmc->sfmode != omode) { 1910 err = -EINVAL; 1911 goto done; 1912 } 1913 } else if (pmc->sfmode != omode) { 1914 /* allow mode switches for empty-set filters */ 1915 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1916 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1917 NULL, 0); 1918 pmc->sfmode = omode; 1919 } 1920 1921 psl = pmc->sflist; 1922 if (!add) { 1923 if (!psl) 1924 goto done; /* err = -EADDRNOTAVAIL */ 1925 rv = !0; 1926 for (i=0; i<psl->sl_count; i++) { 1927 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1928 sizeof(__be32)); 1929 if (rv == 0) 1930 break; 1931 } 1932 if (rv) /* source not found */ 1933 goto done; /* err = -EADDRNOTAVAIL */ 1934 1935 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1936 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1937 leavegroup = 1; 1938 goto done; 1939 } 1940 1941 /* update the interface filter */ 1942 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1943 &mreqs->imr_sourceaddr, 1); 1944 1945 for (j=i+1; j<psl->sl_count; j++) 1946 psl->sl_addr[j-1] = psl->sl_addr[j]; 1947 psl->sl_count--; 1948 err = 0; 1949 goto done; 1950 } 1951 /* else, add a new source to the filter */ 1952 1953 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1954 err = -ENOBUFS; 1955 goto done; 1956 } 1957 if (!psl || psl->sl_count == psl->sl_max) { 1958 struct ip_sf_socklist *newpsl; 1959 int count = IP_SFBLOCK; 1960 1961 if (psl) 1962 count += psl->sl_max; 1963 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1964 if (!newpsl) { 1965 err = -ENOBUFS; 1966 goto done; 1967 } 1968 newpsl->sl_max = count; 1969 newpsl->sl_count = count - IP_SFBLOCK; 1970 if (psl) { 1971 for (i=0; i<psl->sl_count; i++) 1972 newpsl->sl_addr[i] = psl->sl_addr[i]; 1973 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1974 } 1975 pmc->sflist = psl = newpsl; 1976 } 1977 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1978 for (i=0; i<psl->sl_count; i++) { 1979 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1980 sizeof(__be32)); 1981 if (rv == 0) 1982 break; 1983 } 1984 if (rv == 0) /* address already there is an error */ 1985 goto done; 1986 for (j=psl->sl_count-1; j>=i; j--) 1987 psl->sl_addr[j+1] = psl->sl_addr[j]; 1988 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1989 psl->sl_count++; 1990 err = 0; 1991 /* update the interface list */ 1992 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1993 &mreqs->imr_sourceaddr, 1); 1994 done: 1995 rtnl_unlock(); 1996 if (leavegroup) 1997 return ip_mc_leave_group(sk, &imr); 1998 return err; 1999 } 2000 2001 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2002 { 2003 int err = 0; 2004 struct ip_mreqn imr; 2005 __be32 addr = msf->imsf_multiaddr; 2006 struct ip_mc_socklist *pmc; 2007 struct in_device *in_dev; 2008 struct inet_sock *inet = inet_sk(sk); 2009 struct ip_sf_socklist *newpsl, *psl; 2010 int leavegroup = 0; 2011 2012 if (!ipv4_is_multicast(addr)) 2013 return -EINVAL; 2014 if (msf->imsf_fmode != MCAST_INCLUDE && 2015 msf->imsf_fmode != MCAST_EXCLUDE) 2016 return -EINVAL; 2017 2018 if (!net_eq(sock_net(sk), &init_net)) 2019 return -EPROTONOSUPPORT; 2020 2021 rtnl_lock(); 2022 2023 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2024 imr.imr_address.s_addr = msf->imsf_interface; 2025 imr.imr_ifindex = ifindex; 2026 in_dev = ip_mc_find_dev(&imr); 2027 2028 if (!in_dev) { 2029 err = -ENODEV; 2030 goto done; 2031 } 2032 2033 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2034 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2035 leavegroup = 1; 2036 goto done; 2037 } 2038 2039 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2040 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2041 pmc->multi.imr_ifindex == imr.imr_ifindex) 2042 break; 2043 } 2044 if (!pmc) { /* must have a prior join */ 2045 err = -EINVAL; 2046 goto done; 2047 } 2048 if (msf->imsf_numsrc) { 2049 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2050 GFP_KERNEL); 2051 if (!newpsl) { 2052 err = -ENOBUFS; 2053 goto done; 2054 } 2055 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2056 memcpy(newpsl->sl_addr, msf->imsf_slist, 2057 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2058 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2059 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2060 if (err) { 2061 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2062 goto done; 2063 } 2064 } else { 2065 newpsl = NULL; 2066 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2067 msf->imsf_fmode, 0, NULL, 0); 2068 } 2069 psl = pmc->sflist; 2070 if (psl) { 2071 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2072 psl->sl_count, psl->sl_addr, 0); 2073 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2074 } else 2075 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2076 0, NULL, 0); 2077 pmc->sflist = newpsl; 2078 pmc->sfmode = msf->imsf_fmode; 2079 err = 0; 2080 done: 2081 rtnl_unlock(); 2082 if (leavegroup) 2083 err = ip_mc_leave_group(sk, &imr); 2084 return err; 2085 } 2086 2087 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2088 struct ip_msfilter __user *optval, int __user *optlen) 2089 { 2090 int err, len, count, copycount; 2091 struct ip_mreqn imr; 2092 __be32 addr = msf->imsf_multiaddr; 2093 struct ip_mc_socklist *pmc; 2094 struct in_device *in_dev; 2095 struct inet_sock *inet = inet_sk(sk); 2096 struct ip_sf_socklist *psl; 2097 2098 if (!ipv4_is_multicast(addr)) 2099 return -EINVAL; 2100 2101 if (!net_eq(sock_net(sk), &init_net)) 2102 return -EPROTONOSUPPORT; 2103 2104 rtnl_lock(); 2105 2106 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2107 imr.imr_address.s_addr = msf->imsf_interface; 2108 imr.imr_ifindex = 0; 2109 in_dev = ip_mc_find_dev(&imr); 2110 2111 if (!in_dev) { 2112 err = -ENODEV; 2113 goto done; 2114 } 2115 err = -EADDRNOTAVAIL; 2116 2117 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2118 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2119 pmc->multi.imr_ifindex == imr.imr_ifindex) 2120 break; 2121 } 2122 if (!pmc) /* must have a prior join */ 2123 goto done; 2124 msf->imsf_fmode = pmc->sfmode; 2125 psl = pmc->sflist; 2126 rtnl_unlock(); 2127 if (!psl) { 2128 len = 0; 2129 count = 0; 2130 } else { 2131 count = psl->sl_count; 2132 } 2133 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2134 len = copycount * sizeof(psl->sl_addr[0]); 2135 msf->imsf_numsrc = count; 2136 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2137 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2138 return -EFAULT; 2139 } 2140 if (len && 2141 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2142 return -EFAULT; 2143 return 0; 2144 done: 2145 rtnl_unlock(); 2146 return err; 2147 } 2148 2149 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2150 struct group_filter __user *optval, int __user *optlen) 2151 { 2152 int err, i, count, copycount; 2153 struct sockaddr_in *psin; 2154 __be32 addr; 2155 struct ip_mc_socklist *pmc; 2156 struct inet_sock *inet = inet_sk(sk); 2157 struct ip_sf_socklist *psl; 2158 2159 psin = (struct sockaddr_in *)&gsf->gf_group; 2160 if (psin->sin_family != AF_INET) 2161 return -EINVAL; 2162 addr = psin->sin_addr.s_addr; 2163 if (!ipv4_is_multicast(addr)) 2164 return -EINVAL; 2165 2166 if (!net_eq(sock_net(sk), &init_net)) 2167 return -EPROTONOSUPPORT; 2168 2169 rtnl_lock(); 2170 2171 err = -EADDRNOTAVAIL; 2172 2173 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2174 if (pmc->multi.imr_multiaddr.s_addr == addr && 2175 pmc->multi.imr_ifindex == gsf->gf_interface) 2176 break; 2177 } 2178 if (!pmc) /* must have a prior join */ 2179 goto done; 2180 gsf->gf_fmode = pmc->sfmode; 2181 psl = pmc->sflist; 2182 rtnl_unlock(); 2183 count = psl ? psl->sl_count : 0; 2184 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2185 gsf->gf_numsrc = count; 2186 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2187 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2188 return -EFAULT; 2189 } 2190 for (i=0; i<copycount; i++) { 2191 struct sockaddr_storage ss; 2192 2193 psin = (struct sockaddr_in *)&ss; 2194 memset(&ss, 0, sizeof(ss)); 2195 psin->sin_family = AF_INET; 2196 psin->sin_addr.s_addr = psl->sl_addr[i]; 2197 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2198 return -EFAULT; 2199 } 2200 return 0; 2201 done: 2202 rtnl_unlock(); 2203 return err; 2204 } 2205 2206 /* 2207 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2208 */ 2209 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2210 { 2211 struct inet_sock *inet = inet_sk(sk); 2212 struct ip_mc_socklist *pmc; 2213 struct ip_sf_socklist *psl; 2214 int i; 2215 2216 if (!ipv4_is_multicast(loc_addr)) 2217 return 1; 2218 2219 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2220 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2221 pmc->multi.imr_ifindex == dif) 2222 break; 2223 } 2224 if (!pmc) 2225 return 1; 2226 psl = pmc->sflist; 2227 if (!psl) 2228 return pmc->sfmode == MCAST_EXCLUDE; 2229 2230 for (i=0; i<psl->sl_count; i++) { 2231 if (psl->sl_addr[i] == rmt_addr) 2232 break; 2233 } 2234 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2235 return 0; 2236 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2237 return 0; 2238 return 1; 2239 } 2240 2241 /* 2242 * A socket is closing. 2243 */ 2244 2245 void ip_mc_drop_socket(struct sock *sk) 2246 { 2247 struct inet_sock *inet = inet_sk(sk); 2248 struct ip_mc_socklist *iml; 2249 2250 if (inet->mc_list == NULL) 2251 return; 2252 2253 if (!net_eq(sock_net(sk), &init_net)) 2254 return; 2255 2256 rtnl_lock(); 2257 while ((iml = inet->mc_list) != NULL) { 2258 struct in_device *in_dev; 2259 inet->mc_list = iml->next; 2260 2261 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex); 2262 (void) ip_mc_leave_src(sk, iml, in_dev); 2263 if (in_dev != NULL) { 2264 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2265 in_dev_put(in_dev); 2266 } 2267 sock_kfree_s(sk, iml, sizeof(*iml)); 2268 } 2269 rtnl_unlock(); 2270 } 2271 2272 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2273 { 2274 struct ip_mc_list *im; 2275 struct ip_sf_list *psf; 2276 int rv = 0; 2277 2278 read_lock(&in_dev->mc_list_lock); 2279 for (im=in_dev->mc_list; im; im=im->next) { 2280 if (im->multiaddr == mc_addr) 2281 break; 2282 } 2283 if (im && proto == IPPROTO_IGMP) { 2284 rv = 1; 2285 } else if (im) { 2286 if (src_addr) { 2287 for (psf=im->sources; psf; psf=psf->sf_next) { 2288 if (psf->sf_inaddr == src_addr) 2289 break; 2290 } 2291 if (psf) 2292 rv = psf->sf_count[MCAST_INCLUDE] || 2293 psf->sf_count[MCAST_EXCLUDE] != 2294 im->sfcount[MCAST_EXCLUDE]; 2295 else 2296 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2297 } else 2298 rv = 1; /* unspecified source; tentatively allow */ 2299 } 2300 read_unlock(&in_dev->mc_list_lock); 2301 return rv; 2302 } 2303 2304 #if defined(CONFIG_PROC_FS) 2305 struct igmp_mc_iter_state { 2306 struct net_device *dev; 2307 struct in_device *in_dev; 2308 }; 2309 2310 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2311 2312 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2313 { 2314 struct ip_mc_list *im = NULL; 2315 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2316 2317 state->in_dev = NULL; 2318 for_each_netdev(&init_net, state->dev) { 2319 struct in_device *in_dev; 2320 in_dev = in_dev_get(state->dev); 2321 if (!in_dev) 2322 continue; 2323 read_lock(&in_dev->mc_list_lock); 2324 im = in_dev->mc_list; 2325 if (im) { 2326 state->in_dev = in_dev; 2327 break; 2328 } 2329 read_unlock(&in_dev->mc_list_lock); 2330 in_dev_put(in_dev); 2331 } 2332 return im; 2333 } 2334 2335 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2336 { 2337 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2338 im = im->next; 2339 while (!im) { 2340 if (likely(state->in_dev != NULL)) { 2341 read_unlock(&state->in_dev->mc_list_lock); 2342 in_dev_put(state->in_dev); 2343 } 2344 state->dev = next_net_device(state->dev); 2345 if (!state->dev) { 2346 state->in_dev = NULL; 2347 break; 2348 } 2349 state->in_dev = in_dev_get(state->dev); 2350 if (!state->in_dev) 2351 continue; 2352 read_lock(&state->in_dev->mc_list_lock); 2353 im = state->in_dev->mc_list; 2354 } 2355 return im; 2356 } 2357 2358 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2359 { 2360 struct ip_mc_list *im = igmp_mc_get_first(seq); 2361 if (im) 2362 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2363 --pos; 2364 return pos ? NULL : im; 2365 } 2366 2367 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2368 __acquires(dev_base_lock) 2369 { 2370 read_lock(&dev_base_lock); 2371 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2372 } 2373 2374 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2375 { 2376 struct ip_mc_list *im; 2377 if (v == SEQ_START_TOKEN) 2378 im = igmp_mc_get_first(seq); 2379 else 2380 im = igmp_mc_get_next(seq, v); 2381 ++*pos; 2382 return im; 2383 } 2384 2385 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2386 __releases(dev_base_lock) 2387 { 2388 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2389 if (likely(state->in_dev != NULL)) { 2390 read_unlock(&state->in_dev->mc_list_lock); 2391 in_dev_put(state->in_dev); 2392 state->in_dev = NULL; 2393 } 2394 state->dev = NULL; 2395 read_unlock(&dev_base_lock); 2396 } 2397 2398 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2399 { 2400 if (v == SEQ_START_TOKEN) 2401 seq_puts(seq, 2402 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2403 else { 2404 struct ip_mc_list *im = (struct ip_mc_list *)v; 2405 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2406 char *querier; 2407 #ifdef CONFIG_IP_MULTICAST 2408 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2409 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2410 "V3"; 2411 #else 2412 querier = "NONE"; 2413 #endif 2414 2415 if (state->in_dev->mc_list == im) { 2416 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2417 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2418 } 2419 2420 seq_printf(seq, 2421 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2422 im->multiaddr, im->users, 2423 im->tm_running, im->tm_running ? 2424 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2425 im->reporter); 2426 } 2427 return 0; 2428 } 2429 2430 static const struct seq_operations igmp_mc_seq_ops = { 2431 .start = igmp_mc_seq_start, 2432 .next = igmp_mc_seq_next, 2433 .stop = igmp_mc_seq_stop, 2434 .show = igmp_mc_seq_show, 2435 }; 2436 2437 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2438 { 2439 return seq_open_private(file, &igmp_mc_seq_ops, 2440 sizeof(struct igmp_mc_iter_state)); 2441 } 2442 2443 static const struct file_operations igmp_mc_seq_fops = { 2444 .owner = THIS_MODULE, 2445 .open = igmp_mc_seq_open, 2446 .read = seq_read, 2447 .llseek = seq_lseek, 2448 .release = seq_release_private, 2449 }; 2450 2451 struct igmp_mcf_iter_state { 2452 struct net_device *dev; 2453 struct in_device *idev; 2454 struct ip_mc_list *im; 2455 }; 2456 2457 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2458 2459 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2460 { 2461 struct ip_sf_list *psf = NULL; 2462 struct ip_mc_list *im = NULL; 2463 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2464 2465 state->idev = NULL; 2466 state->im = NULL; 2467 for_each_netdev(&init_net, state->dev) { 2468 struct in_device *idev; 2469 idev = in_dev_get(state->dev); 2470 if (unlikely(idev == NULL)) 2471 continue; 2472 read_lock(&idev->mc_list_lock); 2473 im = idev->mc_list; 2474 if (likely(im != NULL)) { 2475 spin_lock_bh(&im->lock); 2476 psf = im->sources; 2477 if (likely(psf != NULL)) { 2478 state->im = im; 2479 state->idev = idev; 2480 break; 2481 } 2482 spin_unlock_bh(&im->lock); 2483 } 2484 read_unlock(&idev->mc_list_lock); 2485 in_dev_put(idev); 2486 } 2487 return psf; 2488 } 2489 2490 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2491 { 2492 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2493 2494 psf = psf->sf_next; 2495 while (!psf) { 2496 spin_unlock_bh(&state->im->lock); 2497 state->im = state->im->next; 2498 while (!state->im) { 2499 if (likely(state->idev != NULL)) { 2500 read_unlock(&state->idev->mc_list_lock); 2501 in_dev_put(state->idev); 2502 } 2503 state->dev = next_net_device(state->dev); 2504 if (!state->dev) { 2505 state->idev = NULL; 2506 goto out; 2507 } 2508 state->idev = in_dev_get(state->dev); 2509 if (!state->idev) 2510 continue; 2511 read_lock(&state->idev->mc_list_lock); 2512 state->im = state->idev->mc_list; 2513 } 2514 if (!state->im) 2515 break; 2516 spin_lock_bh(&state->im->lock); 2517 psf = state->im->sources; 2518 } 2519 out: 2520 return psf; 2521 } 2522 2523 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2524 { 2525 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2526 if (psf) 2527 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2528 --pos; 2529 return pos ? NULL : psf; 2530 } 2531 2532 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2533 { 2534 read_lock(&dev_base_lock); 2535 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2536 } 2537 2538 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2539 { 2540 struct ip_sf_list *psf; 2541 if (v == SEQ_START_TOKEN) 2542 psf = igmp_mcf_get_first(seq); 2543 else 2544 psf = igmp_mcf_get_next(seq, v); 2545 ++*pos; 2546 return psf; 2547 } 2548 2549 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2550 { 2551 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2552 if (likely(state->im != NULL)) { 2553 spin_unlock_bh(&state->im->lock); 2554 state->im = NULL; 2555 } 2556 if (likely(state->idev != NULL)) { 2557 read_unlock(&state->idev->mc_list_lock); 2558 in_dev_put(state->idev); 2559 state->idev = NULL; 2560 } 2561 state->dev = NULL; 2562 read_unlock(&dev_base_lock); 2563 } 2564 2565 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2566 { 2567 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2568 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2569 2570 if (v == SEQ_START_TOKEN) { 2571 seq_printf(seq, 2572 "%3s %6s " 2573 "%10s %10s %6s %6s\n", "Idx", 2574 "Device", "MCA", 2575 "SRC", "INC", "EXC"); 2576 } else { 2577 seq_printf(seq, 2578 "%3d %6.6s 0x%08x " 2579 "0x%08x %6lu %6lu\n", 2580 state->dev->ifindex, state->dev->name, 2581 ntohl(state->im->multiaddr), 2582 ntohl(psf->sf_inaddr), 2583 psf->sf_count[MCAST_INCLUDE], 2584 psf->sf_count[MCAST_EXCLUDE]); 2585 } 2586 return 0; 2587 } 2588 2589 static const struct seq_operations igmp_mcf_seq_ops = { 2590 .start = igmp_mcf_seq_start, 2591 .next = igmp_mcf_seq_next, 2592 .stop = igmp_mcf_seq_stop, 2593 .show = igmp_mcf_seq_show, 2594 }; 2595 2596 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2597 { 2598 return seq_open_private(file, &igmp_mcf_seq_ops, 2599 sizeof(struct igmp_mcf_iter_state)); 2600 } 2601 2602 static const struct file_operations igmp_mcf_seq_fops = { 2603 .owner = THIS_MODULE, 2604 .open = igmp_mcf_seq_open, 2605 .read = seq_read, 2606 .llseek = seq_lseek, 2607 .release = seq_release_private, 2608 }; 2609 2610 int __init igmp_mc_proc_init(void) 2611 { 2612 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2613 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2614 return 0; 2615 } 2616 #endif 2617 2618 EXPORT_SYMBOL(ip_mc_dec_group); 2619 EXPORT_SYMBOL(ip_mc_inc_group); 2620 EXPORT_SYMBOL(ip_mc_join_group); 2621 EXPORT_SYMBOL(ip_mc_rejoin_group); 2622