igmp.c revision 193ba924524e6afe192217982b2c2d67e4715d33
1/* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * This code implements the IGMP protocol as defined in RFC1112. There has 5 * been a further revision of this protocol since which is now supported. 6 * 7 * If you have trouble with this module be careful what gcc you have used, 8 * the older version didn't come out right using gcc 2.5.8, the newer one 9 * seems to fall out with gcc 2.6.2. 10 * 11 * Authors: 12 * Alan Cox <alan@lxorguk.ukuu.org.uk> 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 * Fixes: 20 * 21 * Alan Cox : Added lots of __inline__ to optimise 22 * the memory usage of all the tiny little 23 * functions. 24 * Alan Cox : Dumped the header building experiment. 25 * Alan Cox : Minor tweaks ready for multicast routing 26 * and extended IGMP protocol. 27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 28 * writes utterly bogus code otherwise (sigh) 29 * fixed IGMP loopback to behave in the manner 30 * desired by mrouted, fixed the fact it has been 31 * broken since 1.3.6 and cleaned up a few minor 32 * points. 33 * 34 * Chih-Jen Chang : Tried to revise IGMP to Version 2 35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 36 * The enhancements are mainly based on Steve Deering's 37 * ipmulti-3.5 source code. 38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 40 * the mrouted version on that device. 41 * Chih-Jen Chang : Added the max_resp_time parameter to 42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 43 * to identify the multicast router version 44 * and do what the IGMP version 2 specified. 45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 46 * Tsu-Sheng Tsao if the specified time expired. 47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 48 * Alan Cox : Use GFP_ATOMIC in the right places. 49 * Christian Daudt : igmp timer wasn't set for local group 50 * memberships but was being deleted, 51 * which caused a "del_timer() called 52 * from %p with timer not initialized\n" 53 * message (960131). 54 * Christian Daudt : removed del_timer from 55 * igmp_timer_expire function (960205). 56 * Christian Daudt : igmp_heard_report now only calls 57 * igmp_timer_expire if tm->running is 58 * true (960216). 59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 60 * igmp_heard_query never trigger. Expiry 61 * miscalculation fixed in igmp_heard_query 62 * and random() made to return unsigned to 63 * prevent negative expiry times. 64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 65 * fix from pending 2.1.x patches. 66 * Alan Cox: Forget to enable FDDI support earlier. 67 * Alexey Kuznetsov: Fixed leaving groups on device down. 68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 69 * David L Stevens: IGMPv3 support, with help from 70 * Vinay Kulkarni 71 */ 72 73#include <linux/module.h> 74#include <linux/slab.h> 75#include <asm/uaccess.h> 76#include <linux/types.h> 77#include <linux/kernel.h> 78#include <linux/jiffies.h> 79#include <linux/string.h> 80#include <linux/socket.h> 81#include <linux/sockios.h> 82#include <linux/in.h> 83#include <linux/inet.h> 84#include <linux/netdevice.h> 85#include <linux/skbuff.h> 86#include <linux/inetdevice.h> 87#include <linux/igmp.h> 88#include <linux/if_arp.h> 89#include <linux/rtnetlink.h> 90#include <linux/times.h> 91 92#include <net/net_namespace.h> 93#include <net/arp.h> 94#include <net/ip.h> 95#include <net/protocol.h> 96#include <net/route.h> 97#include <net/sock.h> 98#include <net/checksum.h> 99#include <linux/netfilter_ipv4.h> 100#ifdef CONFIG_IP_MROUTE 101#include <linux/mroute.h> 102#endif 103#ifdef CONFIG_PROC_FS 104#include <linux/proc_fs.h> 105#include <linux/seq_file.h> 106#endif 107 108#define IP_MAX_MEMBERSHIPS 20 109#define IP_MAX_MSF 10 110 111#ifdef CONFIG_IP_MULTICAST 112/* Parameter names and values are taken from igmp-v2-06 draft */ 113 114#define IGMP_V1_Router_Present_Timeout (400*HZ) 115#define IGMP_V2_Router_Present_Timeout (400*HZ) 116#define IGMP_Unsolicited_Report_Interval (10*HZ) 117#define IGMP_Query_Response_Interval (10*HZ) 118#define IGMP_Unsolicited_Report_Count 2 119 120 121#define IGMP_Initial_Report_Delay (1) 122 123/* IGMP_Initial_Report_Delay is not from IGMP specs! 124 * IGMP specs require to report membership immediately after 125 * joining a group, but we delay the first report by a 126 * small interval. It seems more natural and still does not 127 * contradict to specs provided this delay is small enough. 128 */ 129 130#define IGMP_V1_SEEN(in_dev) \ 131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 133 ((in_dev)->mr_v1_seen && \ 134 time_before(jiffies, (in_dev)->mr_v1_seen))) 135#define IGMP_V2_SEEN(in_dev) \ 136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 138 ((in_dev)->mr_v2_seen && \ 139 time_before(jiffies, (in_dev)->mr_v2_seen))) 140 141static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 142static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 143static void igmpv3_clear_delrec(struct in_device *in_dev); 144static int sf_setstate(struct ip_mc_list *pmc); 145static void sf_markstate(struct ip_mc_list *pmc); 146#endif 147static void ip_mc_clear_src(struct ip_mc_list *pmc); 148static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 149 int sfcount, __be32 *psfsrc, int delta); 150 151static void ip_ma_put(struct ip_mc_list *im) 152{ 153 if (atomic_dec_and_test(&im->refcnt)) { 154 in_dev_put(im->interface); 155 kfree_rcu(im, rcu); 156 } 157} 158 159#define for_each_pmc_rcu(in_dev, pmc) \ 160 for (pmc = rcu_dereference(in_dev->mc_list); \ 161 pmc != NULL; \ 162 pmc = rcu_dereference(pmc->next_rcu)) 163 164#define for_each_pmc_rtnl(in_dev, pmc) \ 165 for (pmc = rtnl_dereference(in_dev->mc_list); \ 166 pmc != NULL; \ 167 pmc = rtnl_dereference(pmc->next_rcu)) 168 169#ifdef CONFIG_IP_MULTICAST 170 171/* 172 * Timer management 173 */ 174 175static void igmp_stop_timer(struct ip_mc_list *im) 176{ 177 spin_lock_bh(&im->lock); 178 if (del_timer(&im->timer)) 179 atomic_dec(&im->refcnt); 180 im->tm_running = 0; 181 im->reporter = 0; 182 im->unsolicit_count = 0; 183 spin_unlock_bh(&im->lock); 184} 185 186/* It must be called with locked im->lock */ 187static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 188{ 189 int tv = net_random() % max_delay; 190 191 im->tm_running = 1; 192 if (!mod_timer(&im->timer, jiffies+tv+2)) 193 atomic_inc(&im->refcnt); 194} 195 196static void igmp_gq_start_timer(struct in_device *in_dev) 197{ 198 int tv = net_random() % in_dev->mr_maxdelay; 199 200 in_dev->mr_gq_running = 1; 201 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 202 in_dev_hold(in_dev); 203} 204 205static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 206{ 207 int tv = net_random() % delay; 208 209 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 210 in_dev_hold(in_dev); 211} 212 213static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 214{ 215 spin_lock_bh(&im->lock); 216 im->unsolicit_count = 0; 217 if (del_timer(&im->timer)) { 218 if ((long)(im->timer.expires-jiffies) < max_delay) { 219 add_timer(&im->timer); 220 im->tm_running = 1; 221 spin_unlock_bh(&im->lock); 222 return; 223 } 224 atomic_dec(&im->refcnt); 225 } 226 igmp_start_timer(im, max_delay); 227 spin_unlock_bh(&im->lock); 228} 229 230 231/* 232 * Send an IGMP report. 233 */ 234 235#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 236 237 238static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 239 int gdeleted, int sdeleted) 240{ 241 switch (type) { 242 case IGMPV3_MODE_IS_INCLUDE: 243 case IGMPV3_MODE_IS_EXCLUDE: 244 if (gdeleted || sdeleted) 245 return 0; 246 if (!(pmc->gsquery && !psf->sf_gsresp)) { 247 if (pmc->sfmode == MCAST_INCLUDE) 248 return 1; 249 /* don't include if this source is excluded 250 * in all filters 251 */ 252 if (psf->sf_count[MCAST_INCLUDE]) 253 return type == IGMPV3_MODE_IS_INCLUDE; 254 return pmc->sfcount[MCAST_EXCLUDE] == 255 psf->sf_count[MCAST_EXCLUDE]; 256 } 257 return 0; 258 case IGMPV3_CHANGE_TO_INCLUDE: 259 if (gdeleted || sdeleted) 260 return 0; 261 return psf->sf_count[MCAST_INCLUDE] != 0; 262 case IGMPV3_CHANGE_TO_EXCLUDE: 263 if (gdeleted || sdeleted) 264 return 0; 265 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 266 psf->sf_count[MCAST_INCLUDE]) 267 return 0; 268 return pmc->sfcount[MCAST_EXCLUDE] == 269 psf->sf_count[MCAST_EXCLUDE]; 270 case IGMPV3_ALLOW_NEW_SOURCES: 271 if (gdeleted || !psf->sf_crcount) 272 return 0; 273 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 274 case IGMPV3_BLOCK_OLD_SOURCES: 275 if (pmc->sfmode == MCAST_INCLUDE) 276 return gdeleted || (psf->sf_crcount && sdeleted); 277 return psf->sf_crcount && !gdeleted && !sdeleted; 278 } 279 return 0; 280} 281 282static int 283igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 284{ 285 struct ip_sf_list *psf; 286 int scount = 0; 287 288 for (psf=pmc->sources; psf; psf=psf->sf_next) { 289 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 290 continue; 291 scount++; 292 } 293 return scount; 294} 295 296#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) 297 298static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 299{ 300 struct sk_buff *skb; 301 struct rtable *rt; 302 struct iphdr *pip; 303 struct igmpv3_report *pig; 304 struct net *net = dev_net(dev); 305 struct flowi4 fl4; 306 int hlen = LL_RESERVED_SPACE(dev); 307 int tlen = dev->needed_tailroom; 308 309 while (1) { 310 skb = alloc_skb(size + hlen + tlen, 311 GFP_ATOMIC | __GFP_NOWARN); 312 if (skb) 313 break; 314 size >>= 1; 315 if (size < 256) 316 return NULL; 317 } 318 igmp_skb_size(skb) = size; 319 320 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 321 0, 0, 322 IPPROTO_IGMP, 0, dev->ifindex); 323 if (IS_ERR(rt)) { 324 kfree_skb(skb); 325 return NULL; 326 } 327 328 skb_dst_set(skb, &rt->dst); 329 skb->dev = dev; 330 331 skb_reserve(skb, hlen); 332 333 skb_reset_network_header(skb); 334 pip = ip_hdr(skb); 335 skb_put(skb, sizeof(struct iphdr) + 4); 336 337 pip->version = 4; 338 pip->ihl = (sizeof(struct iphdr)+4)>>2; 339 pip->tos = 0xc0; 340 pip->frag_off = htons(IP_DF); 341 pip->ttl = 1; 342 pip->daddr = fl4.daddr; 343 pip->saddr = fl4.saddr; 344 pip->protocol = IPPROTO_IGMP; 345 pip->tot_len = 0; /* filled in later */ 346 ip_select_ident(pip, &rt->dst, NULL); 347 ((u8 *)&pip[1])[0] = IPOPT_RA; 348 ((u8 *)&pip[1])[1] = 4; 349 ((u8 *)&pip[1])[2] = 0; 350 ((u8 *)&pip[1])[3] = 0; 351 352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 353 skb_put(skb, sizeof(*pig)); 354 pig = igmpv3_report_hdr(skb); 355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 356 pig->resv1 = 0; 357 pig->csum = 0; 358 pig->resv2 = 0; 359 pig->ngrec = 0; 360 return skb; 361} 362 363static int igmpv3_sendpack(struct sk_buff *skb) 364{ 365 struct igmphdr *pig = igmp_hdr(skb); 366 const int igmplen = skb->tail - skb->transport_header; 367 368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 369 370 return ip_local_out(skb); 371} 372 373static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 374{ 375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 376} 377 378static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 379 int type, struct igmpv3_grec **ppgr) 380{ 381 struct net_device *dev = pmc->interface->dev; 382 struct igmpv3_report *pih; 383 struct igmpv3_grec *pgr; 384 385 if (!skb) 386 skb = igmpv3_newpack(dev, dev->mtu); 387 if (!skb) 388 return NULL; 389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 390 pgr->grec_type = type; 391 pgr->grec_auxwords = 0; 392 pgr->grec_nsrcs = 0; 393 pgr->grec_mca = pmc->multiaddr; 394 pih = igmpv3_report_hdr(skb); 395 pih->ngrec = htons(ntohs(pih->ngrec)+1); 396 *ppgr = pgr; 397 return skb; 398} 399 400#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ 401 skb_tailroom(skb)) : 0) 402 403static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 404 int type, int gdeleted, int sdeleted) 405{ 406 struct net_device *dev = pmc->interface->dev; 407 struct igmpv3_report *pih; 408 struct igmpv3_grec *pgr = NULL; 409 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 410 int scount, stotal, first, isquery, truncate; 411 412 if (pmc->multiaddr == IGMP_ALL_HOSTS) 413 return skb; 414 415 isquery = type == IGMPV3_MODE_IS_INCLUDE || 416 type == IGMPV3_MODE_IS_EXCLUDE; 417 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 418 type == IGMPV3_CHANGE_TO_EXCLUDE; 419 420 stotal = scount = 0; 421 422 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 423 424 if (!*psf_list) 425 goto empty_source; 426 427 pih = skb ? igmpv3_report_hdr(skb) : NULL; 428 429 /* EX and TO_EX get a fresh packet, if needed */ 430 if (truncate) { 431 if (pih && pih->ngrec && 432 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 433 if (skb) 434 igmpv3_sendpack(skb); 435 skb = igmpv3_newpack(dev, dev->mtu); 436 } 437 } 438 first = 1; 439 psf_prev = NULL; 440 for (psf=*psf_list; psf; psf=psf_next) { 441 __be32 *psrc; 442 443 psf_next = psf->sf_next; 444 445 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 446 psf_prev = psf; 447 continue; 448 } 449 450 /* clear marks on query responses */ 451 if (isquery) 452 psf->sf_gsresp = 0; 453 454 if (AVAILABLE(skb) < sizeof(__be32) + 455 first*sizeof(struct igmpv3_grec)) { 456 if (truncate && !first) 457 break; /* truncate these */ 458 if (pgr) 459 pgr->grec_nsrcs = htons(scount); 460 if (skb) 461 igmpv3_sendpack(skb); 462 skb = igmpv3_newpack(dev, dev->mtu); 463 first = 1; 464 scount = 0; 465 } 466 if (first) { 467 skb = add_grhead(skb, pmc, type, &pgr); 468 first = 0; 469 } 470 if (!skb) 471 return NULL; 472 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 473 *psrc = psf->sf_inaddr; 474 scount++; stotal++; 475 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 476 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 477 psf->sf_crcount--; 478 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 479 if (psf_prev) 480 psf_prev->sf_next = psf->sf_next; 481 else 482 *psf_list = psf->sf_next; 483 kfree(psf); 484 continue; 485 } 486 } 487 psf_prev = psf; 488 } 489 490empty_source: 491 if (!stotal) { 492 if (type == IGMPV3_ALLOW_NEW_SOURCES || 493 type == IGMPV3_BLOCK_OLD_SOURCES) 494 return skb; 495 if (pmc->crcount || isquery) { 496 /* make sure we have room for group header */ 497 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 498 igmpv3_sendpack(skb); 499 skb = NULL; /* add_grhead will get a new one */ 500 } 501 skb = add_grhead(skb, pmc, type, &pgr); 502 } 503 } 504 if (pgr) 505 pgr->grec_nsrcs = htons(scount); 506 507 if (isquery) 508 pmc->gsquery = 0; /* clear query state on report */ 509 return skb; 510} 511 512static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 513{ 514 struct sk_buff *skb = NULL; 515 int type; 516 517 if (!pmc) { 518 rcu_read_lock(); 519 for_each_pmc_rcu(in_dev, pmc) { 520 if (pmc->multiaddr == IGMP_ALL_HOSTS) 521 continue; 522 spin_lock_bh(&pmc->lock); 523 if (pmc->sfcount[MCAST_EXCLUDE]) 524 type = IGMPV3_MODE_IS_EXCLUDE; 525 else 526 type = IGMPV3_MODE_IS_INCLUDE; 527 skb = add_grec(skb, pmc, type, 0, 0); 528 spin_unlock_bh(&pmc->lock); 529 } 530 rcu_read_unlock(); 531 } else { 532 spin_lock_bh(&pmc->lock); 533 if (pmc->sfcount[MCAST_EXCLUDE]) 534 type = IGMPV3_MODE_IS_EXCLUDE; 535 else 536 type = IGMPV3_MODE_IS_INCLUDE; 537 skb = add_grec(skb, pmc, type, 0, 0); 538 spin_unlock_bh(&pmc->lock); 539 } 540 if (!skb) 541 return 0; 542 return igmpv3_sendpack(skb); 543} 544 545/* 546 * remove zero-count source records from a source filter list 547 */ 548static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 549{ 550 struct ip_sf_list *psf_prev, *psf_next, *psf; 551 552 psf_prev = NULL; 553 for (psf=*ppsf; psf; psf = psf_next) { 554 psf_next = psf->sf_next; 555 if (psf->sf_crcount == 0) { 556 if (psf_prev) 557 psf_prev->sf_next = psf->sf_next; 558 else 559 *ppsf = psf->sf_next; 560 kfree(psf); 561 } else 562 psf_prev = psf; 563 } 564} 565 566static void igmpv3_send_cr(struct in_device *in_dev) 567{ 568 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 569 struct sk_buff *skb = NULL; 570 int type, dtype; 571 572 rcu_read_lock(); 573 spin_lock_bh(&in_dev->mc_tomb_lock); 574 575 /* deleted MCA's */ 576 pmc_prev = NULL; 577 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 578 pmc_next = pmc->next; 579 if (pmc->sfmode == MCAST_INCLUDE) { 580 type = IGMPV3_BLOCK_OLD_SOURCES; 581 dtype = IGMPV3_BLOCK_OLD_SOURCES; 582 skb = add_grec(skb, pmc, type, 1, 0); 583 skb = add_grec(skb, pmc, dtype, 1, 1); 584 } 585 if (pmc->crcount) { 586 if (pmc->sfmode == MCAST_EXCLUDE) { 587 type = IGMPV3_CHANGE_TO_INCLUDE; 588 skb = add_grec(skb, pmc, type, 1, 0); 589 } 590 pmc->crcount--; 591 if (pmc->crcount == 0) { 592 igmpv3_clear_zeros(&pmc->tomb); 593 igmpv3_clear_zeros(&pmc->sources); 594 } 595 } 596 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 597 if (pmc_prev) 598 pmc_prev->next = pmc_next; 599 else 600 in_dev->mc_tomb = pmc_next; 601 in_dev_put(pmc->interface); 602 kfree(pmc); 603 } else 604 pmc_prev = pmc; 605 } 606 spin_unlock_bh(&in_dev->mc_tomb_lock); 607 608 /* change recs */ 609 for_each_pmc_rcu(in_dev, pmc) { 610 spin_lock_bh(&pmc->lock); 611 if (pmc->sfcount[MCAST_EXCLUDE]) { 612 type = IGMPV3_BLOCK_OLD_SOURCES; 613 dtype = IGMPV3_ALLOW_NEW_SOURCES; 614 } else { 615 type = IGMPV3_ALLOW_NEW_SOURCES; 616 dtype = IGMPV3_BLOCK_OLD_SOURCES; 617 } 618 skb = add_grec(skb, pmc, type, 0, 0); 619 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 620 621 /* filter mode changes */ 622 if (pmc->crcount) { 623 if (pmc->sfmode == MCAST_EXCLUDE) 624 type = IGMPV3_CHANGE_TO_EXCLUDE; 625 else 626 type = IGMPV3_CHANGE_TO_INCLUDE; 627 skb = add_grec(skb, pmc, type, 0, 0); 628 pmc->crcount--; 629 } 630 spin_unlock_bh(&pmc->lock); 631 } 632 rcu_read_unlock(); 633 634 if (!skb) 635 return; 636 (void) igmpv3_sendpack(skb); 637} 638 639static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 640 int type) 641{ 642 struct sk_buff *skb; 643 struct iphdr *iph; 644 struct igmphdr *ih; 645 struct rtable *rt; 646 struct net_device *dev = in_dev->dev; 647 struct net *net = dev_net(dev); 648 __be32 group = pmc ? pmc->multiaddr : 0; 649 struct flowi4 fl4; 650 __be32 dst; 651 int hlen, tlen; 652 653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 654 return igmpv3_send_report(in_dev, pmc); 655 else if (type == IGMP_HOST_LEAVE_MESSAGE) 656 dst = IGMP_ALL_ROUTER; 657 else 658 dst = group; 659 660 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 661 0, 0, 662 IPPROTO_IGMP, 0, dev->ifindex); 663 if (IS_ERR(rt)) 664 return -1; 665 666 hlen = LL_RESERVED_SPACE(dev); 667 tlen = dev->needed_tailroom; 668 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 669 if (skb == NULL) { 670 ip_rt_put(rt); 671 return -1; 672 } 673 674 skb_dst_set(skb, &rt->dst); 675 676 skb_reserve(skb, hlen); 677 678 skb_reset_network_header(skb); 679 iph = ip_hdr(skb); 680 skb_put(skb, sizeof(struct iphdr) + 4); 681 682 iph->version = 4; 683 iph->ihl = (sizeof(struct iphdr)+4)>>2; 684 iph->tos = 0xc0; 685 iph->frag_off = htons(IP_DF); 686 iph->ttl = 1; 687 iph->daddr = dst; 688 iph->saddr = fl4.saddr; 689 iph->protocol = IPPROTO_IGMP; 690 ip_select_ident(iph, &rt->dst, NULL); 691 ((u8 *)&iph[1])[0] = IPOPT_RA; 692 ((u8 *)&iph[1])[1] = 4; 693 ((u8 *)&iph[1])[2] = 0; 694 ((u8 *)&iph[1])[3] = 0; 695 696 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 697 ih->type = type; 698 ih->code = 0; 699 ih->csum = 0; 700 ih->group = group; 701 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 702 703 return ip_local_out(skb); 704} 705 706static void igmp_gq_timer_expire(unsigned long data) 707{ 708 struct in_device *in_dev = (struct in_device *)data; 709 710 in_dev->mr_gq_running = 0; 711 igmpv3_send_report(in_dev, NULL); 712 __in_dev_put(in_dev); 713} 714 715static void igmp_ifc_timer_expire(unsigned long data) 716{ 717 struct in_device *in_dev = (struct in_device *)data; 718 719 igmpv3_send_cr(in_dev); 720 if (in_dev->mr_ifc_count) { 721 in_dev->mr_ifc_count--; 722 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 723 } 724 __in_dev_put(in_dev); 725} 726 727static void igmp_ifc_event(struct in_device *in_dev) 728{ 729 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 730 return; 731 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 732 IGMP_Unsolicited_Report_Count; 733 igmp_ifc_start_timer(in_dev, 1); 734} 735 736 737static void igmp_timer_expire(unsigned long data) 738{ 739 struct ip_mc_list *im=(struct ip_mc_list *)data; 740 struct in_device *in_dev = im->interface; 741 742 spin_lock(&im->lock); 743 im->tm_running = 0; 744 745 if (im->unsolicit_count) { 746 im->unsolicit_count--; 747 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 748 } 749 im->reporter = 1; 750 spin_unlock(&im->lock); 751 752 if (IGMP_V1_SEEN(in_dev)) 753 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 754 else if (IGMP_V2_SEEN(in_dev)) 755 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 756 else 757 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 758 759 ip_ma_put(im); 760} 761 762/* mark EXCLUDE-mode sources */ 763static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 764{ 765 struct ip_sf_list *psf; 766 int i, scount; 767 768 scount = 0; 769 for (psf=pmc->sources; psf; psf=psf->sf_next) { 770 if (scount == nsrcs) 771 break; 772 for (i=0; i<nsrcs; i++) { 773 /* skip inactive filters */ 774 if (psf->sf_count[MCAST_INCLUDE] || 775 pmc->sfcount[MCAST_EXCLUDE] != 776 psf->sf_count[MCAST_EXCLUDE]) 777 break; 778 if (srcs[i] == psf->sf_inaddr) { 779 scount++; 780 break; 781 } 782 } 783 } 784 pmc->gsquery = 0; 785 if (scount == nsrcs) /* all sources excluded */ 786 return 0; 787 return 1; 788} 789 790static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 791{ 792 struct ip_sf_list *psf; 793 int i, scount; 794 795 if (pmc->sfmode == MCAST_EXCLUDE) 796 return igmp_xmarksources(pmc, nsrcs, srcs); 797 798 /* mark INCLUDE-mode sources */ 799 scount = 0; 800 for (psf=pmc->sources; psf; psf=psf->sf_next) { 801 if (scount == nsrcs) 802 break; 803 for (i=0; i<nsrcs; i++) 804 if (srcs[i] == psf->sf_inaddr) { 805 psf->sf_gsresp = 1; 806 scount++; 807 break; 808 } 809 } 810 if (!scount) { 811 pmc->gsquery = 0; 812 return 0; 813 } 814 pmc->gsquery = 1; 815 return 1; 816} 817 818/* return true if packet was dropped */ 819static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 820{ 821 struct ip_mc_list *im; 822 823 /* Timers are only set for non-local groups */ 824 825 if (group == IGMP_ALL_HOSTS) 826 return false; 827 828 rcu_read_lock(); 829 for_each_pmc_rcu(in_dev, im) { 830 if (im->multiaddr == group) { 831 igmp_stop_timer(im); 832 break; 833 } 834 } 835 rcu_read_unlock(); 836 return false; 837} 838 839/* return true if packet was dropped */ 840static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 841 int len) 842{ 843 struct igmphdr *ih = igmp_hdr(skb); 844 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 845 struct ip_mc_list *im; 846 __be32 group = ih->group; 847 int max_delay; 848 int mark = 0; 849 850 851 if (len == 8) { 852 if (ih->code == 0) { 853 /* Alas, old v1 router presents here. */ 854 855 max_delay = IGMP_Query_Response_Interval; 856 in_dev->mr_v1_seen = jiffies + 857 IGMP_V1_Router_Present_Timeout; 858 group = 0; 859 } else { 860 /* v2 router present */ 861 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 862 in_dev->mr_v2_seen = jiffies + 863 IGMP_V2_Router_Present_Timeout; 864 } 865 /* cancel the interface change timer */ 866 in_dev->mr_ifc_count = 0; 867 if (del_timer(&in_dev->mr_ifc_timer)) 868 __in_dev_put(in_dev); 869 /* clear deleted report items */ 870 igmpv3_clear_delrec(in_dev); 871 } else if (len < 12) { 872 return true; /* ignore bogus packet; freed by caller */ 873 } else if (IGMP_V1_SEEN(in_dev)) { 874 /* This is a v3 query with v1 queriers present */ 875 max_delay = IGMP_Query_Response_Interval; 876 group = 0; 877 } else if (IGMP_V2_SEEN(in_dev)) { 878 /* this is a v3 query with v2 queriers present; 879 * Interpretation of the max_delay code is problematic here. 880 * A real v2 host would use ih_code directly, while v3 has a 881 * different encoding. We use the v3 encoding as more likely 882 * to be intended in a v3 query. 883 */ 884 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 885 if (!max_delay) 886 max_delay = 1; /* can't mod w/ 0 */ 887 } else { /* v3 */ 888 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 889 return true; 890 891 ih3 = igmpv3_query_hdr(skb); 892 if (ih3->nsrcs) { 893 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 894 + ntohs(ih3->nsrcs)*sizeof(__be32))) 895 return true; 896 ih3 = igmpv3_query_hdr(skb); 897 } 898 899 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 900 if (!max_delay) 901 max_delay = 1; /* can't mod w/ 0 */ 902 in_dev->mr_maxdelay = max_delay; 903 if (ih3->qrv) 904 in_dev->mr_qrv = ih3->qrv; 905 if (!group) { /* general query */ 906 if (ih3->nsrcs) 907 return false; /* no sources allowed */ 908 igmp_gq_start_timer(in_dev); 909 return false; 910 } 911 /* mark sources to include, if group & source-specific */ 912 mark = ih3->nsrcs != 0; 913 } 914 915 /* 916 * - Start the timers in all of our membership records 917 * that the query applies to for the interface on 918 * which the query arrived excl. those that belong 919 * to a "local" group (224.0.0.X) 920 * - For timers already running check if they need to 921 * be reset. 922 * - Use the igmp->igmp_code field as the maximum 923 * delay possible 924 */ 925 rcu_read_lock(); 926 for_each_pmc_rcu(in_dev, im) { 927 int changed; 928 929 if (group && group != im->multiaddr) 930 continue; 931 if (im->multiaddr == IGMP_ALL_HOSTS) 932 continue; 933 spin_lock_bh(&im->lock); 934 if (im->tm_running) 935 im->gsquery = im->gsquery && mark; 936 else 937 im->gsquery = mark; 938 changed = !im->gsquery || 939 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 940 spin_unlock_bh(&im->lock); 941 if (changed) 942 igmp_mod_timer(im, max_delay); 943 } 944 rcu_read_unlock(); 945 return false; 946} 947 948/* called in rcu_read_lock() section */ 949int igmp_rcv(struct sk_buff *skb) 950{ 951 /* This basically follows the spec line by line -- see RFC1112 */ 952 struct igmphdr *ih; 953 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 954 int len = skb->len; 955 bool dropped = true; 956 957 if (in_dev == NULL) 958 goto drop; 959 960 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 961 goto drop; 962 963 switch (skb->ip_summed) { 964 case CHECKSUM_COMPLETE: 965 if (!csum_fold(skb->csum)) 966 break; 967 /* fall through */ 968 case CHECKSUM_NONE: 969 skb->csum = 0; 970 if (__skb_checksum_complete(skb)) 971 goto drop; 972 } 973 974 ih = igmp_hdr(skb); 975 switch (ih->type) { 976 case IGMP_HOST_MEMBERSHIP_QUERY: 977 dropped = igmp_heard_query(in_dev, skb, len); 978 break; 979 case IGMP_HOST_MEMBERSHIP_REPORT: 980 case IGMPV2_HOST_MEMBERSHIP_REPORT: 981 /* Is it our report looped back? */ 982 if (rt_is_output_route(skb_rtable(skb))) 983 break; 984 /* don't rely on MC router hearing unicast reports */ 985 if (skb->pkt_type == PACKET_MULTICAST || 986 skb->pkt_type == PACKET_BROADCAST) 987 dropped = igmp_heard_report(in_dev, ih->group); 988 break; 989 case IGMP_PIM: 990#ifdef CONFIG_IP_PIMSM_V1 991 return pim_rcv_v1(skb); 992#endif 993 case IGMPV3_HOST_MEMBERSHIP_REPORT: 994 case IGMP_DVMRP: 995 case IGMP_TRACE: 996 case IGMP_HOST_LEAVE_MESSAGE: 997 case IGMP_MTRACE: 998 case IGMP_MTRACE_RESP: 999 break; 1000 default: 1001 break; 1002 } 1003 1004drop: 1005 if (dropped) 1006 kfree_skb(skb); 1007 else 1008 consume_skb(skb); 1009 return 0; 1010} 1011 1012#endif 1013 1014 1015/* 1016 * Add a filter to a device 1017 */ 1018 1019static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1020{ 1021 char buf[MAX_ADDR_LEN]; 1022 struct net_device *dev = in_dev->dev; 1023 1024 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1025 We will get multicast token leakage, when IFF_MULTICAST 1026 is changed. This check should be done in ndo_set_rx_mode 1027 routine. Something sort of: 1028 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1029 --ANK 1030 */ 1031 if (arp_mc_map(addr, buf, dev, 0) == 0) 1032 dev_mc_add(dev, buf); 1033} 1034 1035/* 1036 * Remove a filter from a device 1037 */ 1038 1039static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1040{ 1041 char buf[MAX_ADDR_LEN]; 1042 struct net_device *dev = in_dev->dev; 1043 1044 if (arp_mc_map(addr, buf, dev, 0) == 0) 1045 dev_mc_del(dev, buf); 1046} 1047 1048#ifdef CONFIG_IP_MULTICAST 1049/* 1050 * deleted ip_mc_list manipulation 1051 */ 1052static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1053{ 1054 struct ip_mc_list *pmc; 1055 1056 /* this is an "ip_mc_list" for convenience; only the fields below 1057 * are actually used. In particular, the refcnt and users are not 1058 * used for management of the delete list. Using the same structure 1059 * for deleted items allows change reports to use common code with 1060 * non-deleted or query-response MCA's. 1061 */ 1062 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1063 if (!pmc) 1064 return; 1065 spin_lock_bh(&im->lock); 1066 pmc->interface = im->interface; 1067 in_dev_hold(in_dev); 1068 pmc->multiaddr = im->multiaddr; 1069 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1070 IGMP_Unsolicited_Report_Count; 1071 pmc->sfmode = im->sfmode; 1072 if (pmc->sfmode == MCAST_INCLUDE) { 1073 struct ip_sf_list *psf; 1074 1075 pmc->tomb = im->tomb; 1076 pmc->sources = im->sources; 1077 im->tomb = im->sources = NULL; 1078 for (psf=pmc->sources; psf; psf=psf->sf_next) 1079 psf->sf_crcount = pmc->crcount; 1080 } 1081 spin_unlock_bh(&im->lock); 1082 1083 spin_lock_bh(&in_dev->mc_tomb_lock); 1084 pmc->next = in_dev->mc_tomb; 1085 in_dev->mc_tomb = pmc; 1086 spin_unlock_bh(&in_dev->mc_tomb_lock); 1087} 1088 1089static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1090{ 1091 struct ip_mc_list *pmc, *pmc_prev; 1092 struct ip_sf_list *psf, *psf_next; 1093 1094 spin_lock_bh(&in_dev->mc_tomb_lock); 1095 pmc_prev = NULL; 1096 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1097 if (pmc->multiaddr == multiaddr) 1098 break; 1099 pmc_prev = pmc; 1100 } 1101 if (pmc) { 1102 if (pmc_prev) 1103 pmc_prev->next = pmc->next; 1104 else 1105 in_dev->mc_tomb = pmc->next; 1106 } 1107 spin_unlock_bh(&in_dev->mc_tomb_lock); 1108 if (pmc) { 1109 for (psf=pmc->tomb; psf; psf=psf_next) { 1110 psf_next = psf->sf_next; 1111 kfree(psf); 1112 } 1113 in_dev_put(pmc->interface); 1114 kfree(pmc); 1115 } 1116} 1117 1118static void igmpv3_clear_delrec(struct in_device *in_dev) 1119{ 1120 struct ip_mc_list *pmc, *nextpmc; 1121 1122 spin_lock_bh(&in_dev->mc_tomb_lock); 1123 pmc = in_dev->mc_tomb; 1124 in_dev->mc_tomb = NULL; 1125 spin_unlock_bh(&in_dev->mc_tomb_lock); 1126 1127 for (; pmc; pmc = nextpmc) { 1128 nextpmc = pmc->next; 1129 ip_mc_clear_src(pmc); 1130 in_dev_put(pmc->interface); 1131 kfree(pmc); 1132 } 1133 /* clear dead sources, too */ 1134 rcu_read_lock(); 1135 for_each_pmc_rcu(in_dev, pmc) { 1136 struct ip_sf_list *psf, *psf_next; 1137 1138 spin_lock_bh(&pmc->lock); 1139 psf = pmc->tomb; 1140 pmc->tomb = NULL; 1141 spin_unlock_bh(&pmc->lock); 1142 for (; psf; psf=psf_next) { 1143 psf_next = psf->sf_next; 1144 kfree(psf); 1145 } 1146 } 1147 rcu_read_unlock(); 1148} 1149#endif 1150 1151static void igmp_group_dropped(struct ip_mc_list *im) 1152{ 1153 struct in_device *in_dev = im->interface; 1154#ifdef CONFIG_IP_MULTICAST 1155 int reporter; 1156#endif 1157 1158 if (im->loaded) { 1159 im->loaded = 0; 1160 ip_mc_filter_del(in_dev, im->multiaddr); 1161 } 1162 1163#ifdef CONFIG_IP_MULTICAST 1164 if (im->multiaddr == IGMP_ALL_HOSTS) 1165 return; 1166 1167 reporter = im->reporter; 1168 igmp_stop_timer(im); 1169 1170 if (!in_dev->dead) { 1171 if (IGMP_V1_SEEN(in_dev)) 1172 return; 1173 if (IGMP_V2_SEEN(in_dev)) { 1174 if (reporter) 1175 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1176 return; 1177 } 1178 /* IGMPv3 */ 1179 igmpv3_add_delrec(in_dev, im); 1180 1181 igmp_ifc_event(in_dev); 1182 } 1183#endif 1184} 1185 1186static void igmp_group_added(struct ip_mc_list *im) 1187{ 1188 struct in_device *in_dev = im->interface; 1189 1190 if (im->loaded == 0) { 1191 im->loaded = 1; 1192 ip_mc_filter_add(in_dev, im->multiaddr); 1193 } 1194 1195#ifdef CONFIG_IP_MULTICAST 1196 if (im->multiaddr == IGMP_ALL_HOSTS) 1197 return; 1198 1199 if (in_dev->dead) 1200 return; 1201 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1202 spin_lock_bh(&im->lock); 1203 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1204 spin_unlock_bh(&im->lock); 1205 return; 1206 } 1207 /* else, v3 */ 1208 1209 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1210 IGMP_Unsolicited_Report_Count; 1211 igmp_ifc_event(in_dev); 1212#endif 1213} 1214 1215 1216/* 1217 * Multicast list managers 1218 */ 1219 1220 1221/* 1222 * A socket has joined a multicast group on device dev. 1223 */ 1224 1225void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1226{ 1227 struct ip_mc_list *im; 1228 1229 ASSERT_RTNL(); 1230 1231 for_each_pmc_rtnl(in_dev, im) { 1232 if (im->multiaddr == addr) { 1233 im->users++; 1234 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1235 goto out; 1236 } 1237 } 1238 1239 im = kzalloc(sizeof(*im), GFP_KERNEL); 1240 if (!im) 1241 goto out; 1242 1243 im->users = 1; 1244 im->interface = in_dev; 1245 in_dev_hold(in_dev); 1246 im->multiaddr = addr; 1247 /* initial mode is (EX, empty) */ 1248 im->sfmode = MCAST_EXCLUDE; 1249 im->sfcount[MCAST_EXCLUDE] = 1; 1250 atomic_set(&im->refcnt, 1); 1251 spin_lock_init(&im->lock); 1252#ifdef CONFIG_IP_MULTICAST 1253 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1254 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1255#endif 1256 1257 im->next_rcu = in_dev->mc_list; 1258 in_dev->mc_count++; 1259 rcu_assign_pointer(in_dev->mc_list, im); 1260 1261#ifdef CONFIG_IP_MULTICAST 1262 igmpv3_del_delrec(in_dev, im->multiaddr); 1263#endif 1264 igmp_group_added(im); 1265 if (!in_dev->dead) 1266 ip_rt_multicast_event(in_dev); 1267out: 1268 return; 1269} 1270EXPORT_SYMBOL(ip_mc_inc_group); 1271 1272/* 1273 * Resend IGMP JOIN report; used for bonding. 1274 * Called with rcu_read_lock() 1275 */ 1276void ip_mc_rejoin_groups(struct in_device *in_dev) 1277{ 1278#ifdef CONFIG_IP_MULTICAST 1279 struct ip_mc_list *im; 1280 int type; 1281 1282 for_each_pmc_rcu(in_dev, im) { 1283 if (im->multiaddr == IGMP_ALL_HOSTS) 1284 continue; 1285 1286 /* a failover is happening and switches 1287 * must be notified immediately 1288 */ 1289 if (IGMP_V1_SEEN(in_dev)) 1290 type = IGMP_HOST_MEMBERSHIP_REPORT; 1291 else if (IGMP_V2_SEEN(in_dev)) 1292 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1293 else 1294 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1295 igmp_send_report(in_dev, im, type); 1296 } 1297#endif 1298} 1299EXPORT_SYMBOL(ip_mc_rejoin_groups); 1300 1301/* 1302 * A socket has left a multicast group on device dev 1303 */ 1304 1305void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1306{ 1307 struct ip_mc_list *i; 1308 struct ip_mc_list __rcu **ip; 1309 1310 ASSERT_RTNL(); 1311 1312 for (ip = &in_dev->mc_list; 1313 (i = rtnl_dereference(*ip)) != NULL; 1314 ip = &i->next_rcu) { 1315 if (i->multiaddr == addr) { 1316 if (--i->users == 0) { 1317 *ip = i->next_rcu; 1318 in_dev->mc_count--; 1319 igmp_group_dropped(i); 1320 ip_mc_clear_src(i); 1321 1322 if (!in_dev->dead) 1323 ip_rt_multicast_event(in_dev); 1324 1325 ip_ma_put(i); 1326 return; 1327 } 1328 break; 1329 } 1330 } 1331} 1332EXPORT_SYMBOL(ip_mc_dec_group); 1333 1334/* Device changing type */ 1335 1336void ip_mc_unmap(struct in_device *in_dev) 1337{ 1338 struct ip_mc_list *pmc; 1339 1340 ASSERT_RTNL(); 1341 1342 for_each_pmc_rtnl(in_dev, pmc) 1343 igmp_group_dropped(pmc); 1344} 1345 1346void ip_mc_remap(struct in_device *in_dev) 1347{ 1348 struct ip_mc_list *pmc; 1349 1350 ASSERT_RTNL(); 1351 1352 for_each_pmc_rtnl(in_dev, pmc) 1353 igmp_group_added(pmc); 1354} 1355 1356/* Device going down */ 1357 1358void ip_mc_down(struct in_device *in_dev) 1359{ 1360 struct ip_mc_list *pmc; 1361 1362 ASSERT_RTNL(); 1363 1364 for_each_pmc_rtnl(in_dev, pmc) 1365 igmp_group_dropped(pmc); 1366 1367#ifdef CONFIG_IP_MULTICAST 1368 in_dev->mr_ifc_count = 0; 1369 if (del_timer(&in_dev->mr_ifc_timer)) 1370 __in_dev_put(in_dev); 1371 in_dev->mr_gq_running = 0; 1372 if (del_timer(&in_dev->mr_gq_timer)) 1373 __in_dev_put(in_dev); 1374 igmpv3_clear_delrec(in_dev); 1375#endif 1376 1377 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1378} 1379 1380void ip_mc_init_dev(struct in_device *in_dev) 1381{ 1382 ASSERT_RTNL(); 1383 1384 in_dev->mc_tomb = NULL; 1385#ifdef CONFIG_IP_MULTICAST 1386 in_dev->mr_gq_running = 0; 1387 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1388 (unsigned long)in_dev); 1389 in_dev->mr_ifc_count = 0; 1390 in_dev->mc_count = 0; 1391 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1392 (unsigned long)in_dev); 1393 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1394#endif 1395 1396 spin_lock_init(&in_dev->mc_tomb_lock); 1397} 1398 1399/* Device going up */ 1400 1401void ip_mc_up(struct in_device *in_dev) 1402{ 1403 struct ip_mc_list *pmc; 1404 1405 ASSERT_RTNL(); 1406 1407 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1408 1409 for_each_pmc_rtnl(in_dev, pmc) 1410 igmp_group_added(pmc); 1411} 1412 1413/* 1414 * Device is about to be destroyed: clean up. 1415 */ 1416 1417void ip_mc_destroy_dev(struct in_device *in_dev) 1418{ 1419 struct ip_mc_list *i; 1420 1421 ASSERT_RTNL(); 1422 1423 /* Deactivate timers */ 1424 ip_mc_down(in_dev); 1425 1426 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1427 in_dev->mc_list = i->next_rcu; 1428 in_dev->mc_count--; 1429 1430 /* We've dropped the groups in ip_mc_down already */ 1431 ip_mc_clear_src(i); 1432 ip_ma_put(i); 1433 } 1434} 1435 1436/* RTNL is locked */ 1437static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1438{ 1439 struct net_device *dev = NULL; 1440 struct in_device *idev = NULL; 1441 1442 if (imr->imr_ifindex) { 1443 idev = inetdev_by_index(net, imr->imr_ifindex); 1444 return idev; 1445 } 1446 if (imr->imr_address.s_addr) { 1447 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1448 if (!dev) 1449 return NULL; 1450 } 1451 1452 if (!dev) { 1453 struct rtable *rt = ip_route_output(net, 1454 imr->imr_multiaddr.s_addr, 1455 0, 0, 0); 1456 if (!IS_ERR(rt)) { 1457 dev = rt->dst.dev; 1458 ip_rt_put(rt); 1459 } 1460 } 1461 if (dev) { 1462 imr->imr_ifindex = dev->ifindex; 1463 idev = __in_dev_get_rtnl(dev); 1464 } 1465 return idev; 1466} 1467 1468/* 1469 * Join a socket to a group 1470 */ 1471int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1472int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1473 1474 1475static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1476 __be32 *psfsrc) 1477{ 1478 struct ip_sf_list *psf, *psf_prev; 1479 int rv = 0; 1480 1481 psf_prev = NULL; 1482 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1483 if (psf->sf_inaddr == *psfsrc) 1484 break; 1485 psf_prev = psf; 1486 } 1487 if (!psf || psf->sf_count[sfmode] == 0) { 1488 /* source filter not found, or count wrong => bug */ 1489 return -ESRCH; 1490 } 1491 psf->sf_count[sfmode]--; 1492 if (psf->sf_count[sfmode] == 0) { 1493 ip_rt_multicast_event(pmc->interface); 1494 } 1495 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1496#ifdef CONFIG_IP_MULTICAST 1497 struct in_device *in_dev = pmc->interface; 1498#endif 1499 1500 /* no more filters for this source */ 1501 if (psf_prev) 1502 psf_prev->sf_next = psf->sf_next; 1503 else 1504 pmc->sources = psf->sf_next; 1505#ifdef CONFIG_IP_MULTICAST 1506 if (psf->sf_oldin && 1507 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1508 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1509 IGMP_Unsolicited_Report_Count; 1510 psf->sf_next = pmc->tomb; 1511 pmc->tomb = psf; 1512 rv = 1; 1513 } else 1514#endif 1515 kfree(psf); 1516 } 1517 return rv; 1518} 1519 1520#ifndef CONFIG_IP_MULTICAST 1521#define igmp_ifc_event(x) do { } while (0) 1522#endif 1523 1524static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1525 int sfcount, __be32 *psfsrc, int delta) 1526{ 1527 struct ip_mc_list *pmc; 1528 int changerec = 0; 1529 int i, err; 1530 1531 if (!in_dev) 1532 return -ENODEV; 1533 rcu_read_lock(); 1534 for_each_pmc_rcu(in_dev, pmc) { 1535 if (*pmca == pmc->multiaddr) 1536 break; 1537 } 1538 if (!pmc) { 1539 /* MCA not found?? bug */ 1540 rcu_read_unlock(); 1541 return -ESRCH; 1542 } 1543 spin_lock_bh(&pmc->lock); 1544 rcu_read_unlock(); 1545#ifdef CONFIG_IP_MULTICAST 1546 sf_markstate(pmc); 1547#endif 1548 if (!delta) { 1549 err = -EINVAL; 1550 if (!pmc->sfcount[sfmode]) 1551 goto out_unlock; 1552 pmc->sfcount[sfmode]--; 1553 } 1554 err = 0; 1555 for (i=0; i<sfcount; i++) { 1556 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1557 1558 changerec |= rv > 0; 1559 if (!err && rv < 0) 1560 err = rv; 1561 } 1562 if (pmc->sfmode == MCAST_EXCLUDE && 1563 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1564 pmc->sfcount[MCAST_INCLUDE]) { 1565#ifdef CONFIG_IP_MULTICAST 1566 struct ip_sf_list *psf; 1567#endif 1568 1569 /* filter mode change */ 1570 pmc->sfmode = MCAST_INCLUDE; 1571#ifdef CONFIG_IP_MULTICAST 1572 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1573 IGMP_Unsolicited_Report_Count; 1574 in_dev->mr_ifc_count = pmc->crcount; 1575 for (psf=pmc->sources; psf; psf = psf->sf_next) 1576 psf->sf_crcount = 0; 1577 igmp_ifc_event(pmc->interface); 1578 } else if (sf_setstate(pmc) || changerec) { 1579 igmp_ifc_event(pmc->interface); 1580#endif 1581 } 1582out_unlock: 1583 spin_unlock_bh(&pmc->lock); 1584 return err; 1585} 1586 1587/* 1588 * Add multicast single-source filter to the interface list 1589 */ 1590static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1591 __be32 *psfsrc) 1592{ 1593 struct ip_sf_list *psf, *psf_prev; 1594 1595 psf_prev = NULL; 1596 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1597 if (psf->sf_inaddr == *psfsrc) 1598 break; 1599 psf_prev = psf; 1600 } 1601 if (!psf) { 1602 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1603 if (!psf) 1604 return -ENOBUFS; 1605 psf->sf_inaddr = *psfsrc; 1606 if (psf_prev) { 1607 psf_prev->sf_next = psf; 1608 } else 1609 pmc->sources = psf; 1610 } 1611 psf->sf_count[sfmode]++; 1612 if (psf->sf_count[sfmode] == 1) { 1613 ip_rt_multicast_event(pmc->interface); 1614 } 1615 return 0; 1616} 1617 1618#ifdef CONFIG_IP_MULTICAST 1619static void sf_markstate(struct ip_mc_list *pmc) 1620{ 1621 struct ip_sf_list *psf; 1622 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1623 1624 for (psf=pmc->sources; psf; psf=psf->sf_next) 1625 if (pmc->sfcount[MCAST_EXCLUDE]) { 1626 psf->sf_oldin = mca_xcount == 1627 psf->sf_count[MCAST_EXCLUDE] && 1628 !psf->sf_count[MCAST_INCLUDE]; 1629 } else 1630 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1631} 1632 1633static int sf_setstate(struct ip_mc_list *pmc) 1634{ 1635 struct ip_sf_list *psf, *dpsf; 1636 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1637 int qrv = pmc->interface->mr_qrv; 1638 int new_in, rv; 1639 1640 rv = 0; 1641 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1642 if (pmc->sfcount[MCAST_EXCLUDE]) { 1643 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1644 !psf->sf_count[MCAST_INCLUDE]; 1645 } else 1646 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1647 if (new_in) { 1648 if (!psf->sf_oldin) { 1649 struct ip_sf_list *prev = NULL; 1650 1651 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1652 if (dpsf->sf_inaddr == psf->sf_inaddr) 1653 break; 1654 prev = dpsf; 1655 } 1656 if (dpsf) { 1657 if (prev) 1658 prev->sf_next = dpsf->sf_next; 1659 else 1660 pmc->tomb = dpsf->sf_next; 1661 kfree(dpsf); 1662 } 1663 psf->sf_crcount = qrv; 1664 rv++; 1665 } 1666 } else if (psf->sf_oldin) { 1667 1668 psf->sf_crcount = 0; 1669 /* 1670 * add or update "delete" records if an active filter 1671 * is now inactive 1672 */ 1673 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1674 if (dpsf->sf_inaddr == psf->sf_inaddr) 1675 break; 1676 if (!dpsf) { 1677 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1678 if (!dpsf) 1679 continue; 1680 *dpsf = *psf; 1681 /* pmc->lock held by callers */ 1682 dpsf->sf_next = pmc->tomb; 1683 pmc->tomb = dpsf; 1684 } 1685 dpsf->sf_crcount = qrv; 1686 rv++; 1687 } 1688 } 1689 return rv; 1690} 1691#endif 1692 1693/* 1694 * Add multicast source filter list to the interface list 1695 */ 1696static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1697 int sfcount, __be32 *psfsrc, int delta) 1698{ 1699 struct ip_mc_list *pmc; 1700 int isexclude; 1701 int i, err; 1702 1703 if (!in_dev) 1704 return -ENODEV; 1705 rcu_read_lock(); 1706 for_each_pmc_rcu(in_dev, pmc) { 1707 if (*pmca == pmc->multiaddr) 1708 break; 1709 } 1710 if (!pmc) { 1711 /* MCA not found?? bug */ 1712 rcu_read_unlock(); 1713 return -ESRCH; 1714 } 1715 spin_lock_bh(&pmc->lock); 1716 rcu_read_unlock(); 1717 1718#ifdef CONFIG_IP_MULTICAST 1719 sf_markstate(pmc); 1720#endif 1721 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1722 if (!delta) 1723 pmc->sfcount[sfmode]++; 1724 err = 0; 1725 for (i=0; i<sfcount; i++) { 1726 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1727 if (err) 1728 break; 1729 } 1730 if (err) { 1731 int j; 1732 1733 if (!delta) 1734 pmc->sfcount[sfmode]--; 1735 for (j=0; j<i; j++) 1736 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1737 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1738#ifdef CONFIG_IP_MULTICAST 1739 struct ip_sf_list *psf; 1740 in_dev = pmc->interface; 1741#endif 1742 1743 /* filter mode change */ 1744 if (pmc->sfcount[MCAST_EXCLUDE]) 1745 pmc->sfmode = MCAST_EXCLUDE; 1746 else if (pmc->sfcount[MCAST_INCLUDE]) 1747 pmc->sfmode = MCAST_INCLUDE; 1748#ifdef CONFIG_IP_MULTICAST 1749 /* else no filters; keep old mode for reports */ 1750 1751 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1752 IGMP_Unsolicited_Report_Count; 1753 in_dev->mr_ifc_count = pmc->crcount; 1754 for (psf=pmc->sources; psf; psf = psf->sf_next) 1755 psf->sf_crcount = 0; 1756 igmp_ifc_event(in_dev); 1757 } else if (sf_setstate(pmc)) { 1758 igmp_ifc_event(in_dev); 1759#endif 1760 } 1761 spin_unlock_bh(&pmc->lock); 1762 return err; 1763} 1764 1765static void ip_mc_clear_src(struct ip_mc_list *pmc) 1766{ 1767 struct ip_sf_list *psf, *nextpsf; 1768 1769 for (psf=pmc->tomb; psf; psf=nextpsf) { 1770 nextpsf = psf->sf_next; 1771 kfree(psf); 1772 } 1773 pmc->tomb = NULL; 1774 for (psf=pmc->sources; psf; psf=nextpsf) { 1775 nextpsf = psf->sf_next; 1776 kfree(psf); 1777 } 1778 pmc->sources = NULL; 1779 pmc->sfmode = MCAST_EXCLUDE; 1780 pmc->sfcount[MCAST_INCLUDE] = 0; 1781 pmc->sfcount[MCAST_EXCLUDE] = 1; 1782} 1783 1784 1785/* 1786 * Join a multicast group 1787 */ 1788int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1789{ 1790 int err; 1791 __be32 addr = imr->imr_multiaddr.s_addr; 1792 struct ip_mc_socklist *iml = NULL, *i; 1793 struct in_device *in_dev; 1794 struct inet_sock *inet = inet_sk(sk); 1795 struct net *net = sock_net(sk); 1796 int ifindex; 1797 int count = 0; 1798 1799 if (!ipv4_is_multicast(addr)) 1800 return -EINVAL; 1801 1802 rtnl_lock(); 1803 1804 in_dev = ip_mc_find_dev(net, imr); 1805 1806 if (!in_dev) { 1807 iml = NULL; 1808 err = -ENODEV; 1809 goto done; 1810 } 1811 1812 err = -EADDRINUSE; 1813 ifindex = imr->imr_ifindex; 1814 for_each_pmc_rtnl(inet, i) { 1815 if (i->multi.imr_multiaddr.s_addr == addr && 1816 i->multi.imr_ifindex == ifindex) 1817 goto done; 1818 count++; 1819 } 1820 err = -ENOBUFS; 1821 if (count >= sysctl_igmp_max_memberships) 1822 goto done; 1823 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1824 if (iml == NULL) 1825 goto done; 1826 1827 memcpy(&iml->multi, imr, sizeof(*imr)); 1828 iml->next_rcu = inet->mc_list; 1829 iml->sflist = NULL; 1830 iml->sfmode = MCAST_EXCLUDE; 1831 rcu_assign_pointer(inet->mc_list, iml); 1832 ip_mc_inc_group(in_dev, addr); 1833 err = 0; 1834done: 1835 rtnl_unlock(); 1836 return err; 1837} 1838EXPORT_SYMBOL(ip_mc_join_group); 1839 1840static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1841 struct in_device *in_dev) 1842{ 1843 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1844 int err; 1845 1846 if (psf == NULL) { 1847 /* any-source empty exclude case */ 1848 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1849 iml->sfmode, 0, NULL, 0); 1850 } 1851 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1852 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1853 RCU_INIT_POINTER(iml->sflist, NULL); 1854 /* decrease mem now to avoid the memleak warning */ 1855 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1856 kfree_rcu(psf, rcu); 1857 return err; 1858} 1859 1860/* 1861 * Ask a socket to leave a group. 1862 */ 1863 1864int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1865{ 1866 struct inet_sock *inet = inet_sk(sk); 1867 struct ip_mc_socklist *iml; 1868 struct ip_mc_socklist __rcu **imlp; 1869 struct in_device *in_dev; 1870 struct net *net = sock_net(sk); 1871 __be32 group = imr->imr_multiaddr.s_addr; 1872 u32 ifindex; 1873 int ret = -EADDRNOTAVAIL; 1874 1875 rtnl_lock(); 1876 in_dev = ip_mc_find_dev(net, imr); 1877 ifindex = imr->imr_ifindex; 1878 for (imlp = &inet->mc_list; 1879 (iml = rtnl_dereference(*imlp)) != NULL; 1880 imlp = &iml->next_rcu) { 1881 if (iml->multi.imr_multiaddr.s_addr != group) 1882 continue; 1883 if (ifindex) { 1884 if (iml->multi.imr_ifindex != ifindex) 1885 continue; 1886 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1887 iml->multi.imr_address.s_addr) 1888 continue; 1889 1890 (void) ip_mc_leave_src(sk, iml, in_dev); 1891 1892 *imlp = iml->next_rcu; 1893 1894 if (in_dev) 1895 ip_mc_dec_group(in_dev, group); 1896 rtnl_unlock(); 1897 /* decrease mem now to avoid the memleak warning */ 1898 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1899 kfree_rcu(iml, rcu); 1900 return 0; 1901 } 1902 if (!in_dev) 1903 ret = -ENODEV; 1904 rtnl_unlock(); 1905 return ret; 1906} 1907EXPORT_SYMBOL(ip_mc_leave_group); 1908 1909int ip_mc_source(int add, int omode, struct sock *sk, struct 1910 ip_mreq_source *mreqs, int ifindex) 1911{ 1912 int err; 1913 struct ip_mreqn imr; 1914 __be32 addr = mreqs->imr_multiaddr; 1915 struct ip_mc_socklist *pmc; 1916 struct in_device *in_dev = NULL; 1917 struct inet_sock *inet = inet_sk(sk); 1918 struct ip_sf_socklist *psl; 1919 struct net *net = sock_net(sk); 1920 int leavegroup = 0; 1921 int i, j, rv; 1922 1923 if (!ipv4_is_multicast(addr)) 1924 return -EINVAL; 1925 1926 rtnl_lock(); 1927 1928 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1929 imr.imr_address.s_addr = mreqs->imr_interface; 1930 imr.imr_ifindex = ifindex; 1931 in_dev = ip_mc_find_dev(net, &imr); 1932 1933 if (!in_dev) { 1934 err = -ENODEV; 1935 goto done; 1936 } 1937 err = -EADDRNOTAVAIL; 1938 1939 for_each_pmc_rtnl(inet, pmc) { 1940 if ((pmc->multi.imr_multiaddr.s_addr == 1941 imr.imr_multiaddr.s_addr) && 1942 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1943 break; 1944 } 1945 if (!pmc) { /* must have a prior join */ 1946 err = -EINVAL; 1947 goto done; 1948 } 1949 /* if a source filter was set, must be the same mode as before */ 1950 if (pmc->sflist) { 1951 if (pmc->sfmode != omode) { 1952 err = -EINVAL; 1953 goto done; 1954 } 1955 } else if (pmc->sfmode != omode) { 1956 /* allow mode switches for empty-set filters */ 1957 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1958 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1959 NULL, 0); 1960 pmc->sfmode = omode; 1961 } 1962 1963 psl = rtnl_dereference(pmc->sflist); 1964 if (!add) { 1965 if (!psl) 1966 goto done; /* err = -EADDRNOTAVAIL */ 1967 rv = !0; 1968 for (i=0; i<psl->sl_count; i++) { 1969 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1970 sizeof(__be32)); 1971 if (rv == 0) 1972 break; 1973 } 1974 if (rv) /* source not found */ 1975 goto done; /* err = -EADDRNOTAVAIL */ 1976 1977 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1978 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1979 leavegroup = 1; 1980 goto done; 1981 } 1982 1983 /* update the interface filter */ 1984 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1985 &mreqs->imr_sourceaddr, 1); 1986 1987 for (j=i+1; j<psl->sl_count; j++) 1988 psl->sl_addr[j-1] = psl->sl_addr[j]; 1989 psl->sl_count--; 1990 err = 0; 1991 goto done; 1992 } 1993 /* else, add a new source to the filter */ 1994 1995 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1996 err = -ENOBUFS; 1997 goto done; 1998 } 1999 if (!psl || psl->sl_count == psl->sl_max) { 2000 struct ip_sf_socklist *newpsl; 2001 int count = IP_SFBLOCK; 2002 2003 if (psl) 2004 count += psl->sl_max; 2005 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2006 if (!newpsl) { 2007 err = -ENOBUFS; 2008 goto done; 2009 } 2010 newpsl->sl_max = count; 2011 newpsl->sl_count = count - IP_SFBLOCK; 2012 if (psl) { 2013 for (i=0; i<psl->sl_count; i++) 2014 newpsl->sl_addr[i] = psl->sl_addr[i]; 2015 /* decrease mem now to avoid the memleak warning */ 2016 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2017 kfree_rcu(psl, rcu); 2018 } 2019 rcu_assign_pointer(pmc->sflist, newpsl); 2020 psl = newpsl; 2021 } 2022 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2023 for (i=0; i<psl->sl_count; i++) { 2024 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2025 sizeof(__be32)); 2026 if (rv == 0) 2027 break; 2028 } 2029 if (rv == 0) /* address already there is an error */ 2030 goto done; 2031 for (j=psl->sl_count-1; j>=i; j--) 2032 psl->sl_addr[j+1] = psl->sl_addr[j]; 2033 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2034 psl->sl_count++; 2035 err = 0; 2036 /* update the interface list */ 2037 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2038 &mreqs->imr_sourceaddr, 1); 2039done: 2040 rtnl_unlock(); 2041 if (leavegroup) 2042 return ip_mc_leave_group(sk, &imr); 2043 return err; 2044} 2045 2046int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2047{ 2048 int err = 0; 2049 struct ip_mreqn imr; 2050 __be32 addr = msf->imsf_multiaddr; 2051 struct ip_mc_socklist *pmc; 2052 struct in_device *in_dev; 2053 struct inet_sock *inet = inet_sk(sk); 2054 struct ip_sf_socklist *newpsl, *psl; 2055 struct net *net = sock_net(sk); 2056 int leavegroup = 0; 2057 2058 if (!ipv4_is_multicast(addr)) 2059 return -EINVAL; 2060 if (msf->imsf_fmode != MCAST_INCLUDE && 2061 msf->imsf_fmode != MCAST_EXCLUDE) 2062 return -EINVAL; 2063 2064 rtnl_lock(); 2065 2066 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2067 imr.imr_address.s_addr = msf->imsf_interface; 2068 imr.imr_ifindex = ifindex; 2069 in_dev = ip_mc_find_dev(net, &imr); 2070 2071 if (!in_dev) { 2072 err = -ENODEV; 2073 goto done; 2074 } 2075 2076 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2077 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2078 leavegroup = 1; 2079 goto done; 2080 } 2081 2082 for_each_pmc_rtnl(inet, pmc) { 2083 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2084 pmc->multi.imr_ifindex == imr.imr_ifindex) 2085 break; 2086 } 2087 if (!pmc) { /* must have a prior join */ 2088 err = -EINVAL; 2089 goto done; 2090 } 2091 if (msf->imsf_numsrc) { 2092 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2093 GFP_KERNEL); 2094 if (!newpsl) { 2095 err = -ENOBUFS; 2096 goto done; 2097 } 2098 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2099 memcpy(newpsl->sl_addr, msf->imsf_slist, 2100 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2101 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2102 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2103 if (err) { 2104 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2105 goto done; 2106 } 2107 } else { 2108 newpsl = NULL; 2109 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2110 msf->imsf_fmode, 0, NULL, 0); 2111 } 2112 psl = rtnl_dereference(pmc->sflist); 2113 if (psl) { 2114 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2115 psl->sl_count, psl->sl_addr, 0); 2116 /* decrease mem now to avoid the memleak warning */ 2117 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2118 kfree_rcu(psl, rcu); 2119 } else 2120 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2121 0, NULL, 0); 2122 rcu_assign_pointer(pmc->sflist, newpsl); 2123 pmc->sfmode = msf->imsf_fmode; 2124 err = 0; 2125done: 2126 rtnl_unlock(); 2127 if (leavegroup) 2128 err = ip_mc_leave_group(sk, &imr); 2129 return err; 2130} 2131 2132int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2133 struct ip_msfilter __user *optval, int __user *optlen) 2134{ 2135 int err, len, count, copycount; 2136 struct ip_mreqn imr; 2137 __be32 addr = msf->imsf_multiaddr; 2138 struct ip_mc_socklist *pmc; 2139 struct in_device *in_dev; 2140 struct inet_sock *inet = inet_sk(sk); 2141 struct ip_sf_socklist *psl; 2142 struct net *net = sock_net(sk); 2143 2144 if (!ipv4_is_multicast(addr)) 2145 return -EINVAL; 2146 2147 rtnl_lock(); 2148 2149 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2150 imr.imr_address.s_addr = msf->imsf_interface; 2151 imr.imr_ifindex = 0; 2152 in_dev = ip_mc_find_dev(net, &imr); 2153 2154 if (!in_dev) { 2155 err = -ENODEV; 2156 goto done; 2157 } 2158 err = -EADDRNOTAVAIL; 2159 2160 for_each_pmc_rtnl(inet, pmc) { 2161 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2162 pmc->multi.imr_ifindex == imr.imr_ifindex) 2163 break; 2164 } 2165 if (!pmc) /* must have a prior join */ 2166 goto done; 2167 msf->imsf_fmode = pmc->sfmode; 2168 psl = rtnl_dereference(pmc->sflist); 2169 rtnl_unlock(); 2170 if (!psl) { 2171 len = 0; 2172 count = 0; 2173 } else { 2174 count = psl->sl_count; 2175 } 2176 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2177 len = copycount * sizeof(psl->sl_addr[0]); 2178 msf->imsf_numsrc = count; 2179 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2180 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2181 return -EFAULT; 2182 } 2183 if (len && 2184 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2185 return -EFAULT; 2186 return 0; 2187done: 2188 rtnl_unlock(); 2189 return err; 2190} 2191 2192int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2193 struct group_filter __user *optval, int __user *optlen) 2194{ 2195 int err, i, count, copycount; 2196 struct sockaddr_in *psin; 2197 __be32 addr; 2198 struct ip_mc_socklist *pmc; 2199 struct inet_sock *inet = inet_sk(sk); 2200 struct ip_sf_socklist *psl; 2201 2202 psin = (struct sockaddr_in *)&gsf->gf_group; 2203 if (psin->sin_family != AF_INET) 2204 return -EINVAL; 2205 addr = psin->sin_addr.s_addr; 2206 if (!ipv4_is_multicast(addr)) 2207 return -EINVAL; 2208 2209 rtnl_lock(); 2210 2211 err = -EADDRNOTAVAIL; 2212 2213 for_each_pmc_rtnl(inet, pmc) { 2214 if (pmc->multi.imr_multiaddr.s_addr == addr && 2215 pmc->multi.imr_ifindex == gsf->gf_interface) 2216 break; 2217 } 2218 if (!pmc) /* must have a prior join */ 2219 goto done; 2220 gsf->gf_fmode = pmc->sfmode; 2221 psl = rtnl_dereference(pmc->sflist); 2222 rtnl_unlock(); 2223 count = psl ? psl->sl_count : 0; 2224 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2225 gsf->gf_numsrc = count; 2226 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2227 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2228 return -EFAULT; 2229 } 2230 for (i=0; i<copycount; i++) { 2231 struct sockaddr_storage ss; 2232 2233 psin = (struct sockaddr_in *)&ss; 2234 memset(&ss, 0, sizeof(ss)); 2235 psin->sin_family = AF_INET; 2236 psin->sin_addr.s_addr = psl->sl_addr[i]; 2237 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2238 return -EFAULT; 2239 } 2240 return 0; 2241done: 2242 rtnl_unlock(); 2243 return err; 2244} 2245 2246/* 2247 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2248 */ 2249int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2250{ 2251 struct inet_sock *inet = inet_sk(sk); 2252 struct ip_mc_socklist *pmc; 2253 struct ip_sf_socklist *psl; 2254 int i; 2255 int ret; 2256 2257 ret = 1; 2258 if (!ipv4_is_multicast(loc_addr)) 2259 goto out; 2260 2261 rcu_read_lock(); 2262 for_each_pmc_rcu(inet, pmc) { 2263 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2264 pmc->multi.imr_ifindex == dif) 2265 break; 2266 } 2267 ret = inet->mc_all; 2268 if (!pmc) 2269 goto unlock; 2270 psl = rcu_dereference(pmc->sflist); 2271 ret = (pmc->sfmode == MCAST_EXCLUDE); 2272 if (!psl) 2273 goto unlock; 2274 2275 for (i=0; i<psl->sl_count; i++) { 2276 if (psl->sl_addr[i] == rmt_addr) 2277 break; 2278 } 2279 ret = 0; 2280 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2281 goto unlock; 2282 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2283 goto unlock; 2284 ret = 1; 2285unlock: 2286 rcu_read_unlock(); 2287out: 2288 return ret; 2289} 2290 2291/* 2292 * A socket is closing. 2293 */ 2294 2295void ip_mc_drop_socket(struct sock *sk) 2296{ 2297 struct inet_sock *inet = inet_sk(sk); 2298 struct ip_mc_socklist *iml; 2299 struct net *net = sock_net(sk); 2300 2301 if (inet->mc_list == NULL) 2302 return; 2303 2304 rtnl_lock(); 2305 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2306 struct in_device *in_dev; 2307 2308 inet->mc_list = iml->next_rcu; 2309 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2310 (void) ip_mc_leave_src(sk, iml, in_dev); 2311 if (in_dev != NULL) 2312 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2313 /* decrease mem now to avoid the memleak warning */ 2314 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2315 kfree_rcu(iml, rcu); 2316 } 2317 rtnl_unlock(); 2318} 2319 2320/* called with rcu_read_lock() */ 2321int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2322{ 2323 struct ip_mc_list *im; 2324 struct ip_sf_list *psf; 2325 int rv = 0; 2326 2327 for_each_pmc_rcu(in_dev, im) { 2328 if (im->multiaddr == mc_addr) 2329 break; 2330 } 2331 if (im && proto == IPPROTO_IGMP) { 2332 rv = 1; 2333 } else if (im) { 2334 if (src_addr) { 2335 for (psf=im->sources; psf; psf=psf->sf_next) { 2336 if (psf->sf_inaddr == src_addr) 2337 break; 2338 } 2339 if (psf) 2340 rv = psf->sf_count[MCAST_INCLUDE] || 2341 psf->sf_count[MCAST_EXCLUDE] != 2342 im->sfcount[MCAST_EXCLUDE]; 2343 else 2344 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2345 } else 2346 rv = 1; /* unspecified source; tentatively allow */ 2347 } 2348 return rv; 2349} 2350 2351#if defined(CONFIG_PROC_FS) 2352struct igmp_mc_iter_state { 2353 struct seq_net_private p; 2354 struct net_device *dev; 2355 struct in_device *in_dev; 2356}; 2357 2358#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2359 2360static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2361{ 2362 struct net *net = seq_file_net(seq); 2363 struct ip_mc_list *im = NULL; 2364 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2365 2366 state->in_dev = NULL; 2367 for_each_netdev_rcu(net, state->dev) { 2368 struct in_device *in_dev; 2369 2370 in_dev = __in_dev_get_rcu(state->dev); 2371 if (!in_dev) 2372 continue; 2373 im = rcu_dereference(in_dev->mc_list); 2374 if (im) { 2375 state->in_dev = in_dev; 2376 break; 2377 } 2378 } 2379 return im; 2380} 2381 2382static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2383{ 2384 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2385 2386 im = rcu_dereference(im->next_rcu); 2387 while (!im) { 2388 state->dev = next_net_device_rcu(state->dev); 2389 if (!state->dev) { 2390 state->in_dev = NULL; 2391 break; 2392 } 2393 state->in_dev = __in_dev_get_rcu(state->dev); 2394 if (!state->in_dev) 2395 continue; 2396 im = rcu_dereference(state->in_dev->mc_list); 2397 } 2398 return im; 2399} 2400 2401static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2402{ 2403 struct ip_mc_list *im = igmp_mc_get_first(seq); 2404 if (im) 2405 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2406 --pos; 2407 return pos ? NULL : im; 2408} 2409 2410static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2411 __acquires(rcu) 2412{ 2413 rcu_read_lock(); 2414 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2415} 2416 2417static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2418{ 2419 struct ip_mc_list *im; 2420 if (v == SEQ_START_TOKEN) 2421 im = igmp_mc_get_first(seq); 2422 else 2423 im = igmp_mc_get_next(seq, v); 2424 ++*pos; 2425 return im; 2426} 2427 2428static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2429 __releases(rcu) 2430{ 2431 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2432 2433 state->in_dev = NULL; 2434 state->dev = NULL; 2435 rcu_read_unlock(); 2436} 2437 2438static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2439{ 2440 if (v == SEQ_START_TOKEN) 2441 seq_puts(seq, 2442 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2443 else { 2444 struct ip_mc_list *im = (struct ip_mc_list *)v; 2445 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2446 char *querier; 2447 long delta; 2448 2449#ifdef CONFIG_IP_MULTICAST 2450 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2451 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2452 "V3"; 2453#else 2454 querier = "NONE"; 2455#endif 2456 2457 if (rcu_dereference(state->in_dev->mc_list) == im) { 2458 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2459 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2460 } 2461 2462 delta = im->timer.expires - jiffies; 2463 seq_printf(seq, 2464 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2465 im->multiaddr, im->users, 2466 im->tm_running, 2467 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2468 im->reporter); 2469 } 2470 return 0; 2471} 2472 2473static const struct seq_operations igmp_mc_seq_ops = { 2474 .start = igmp_mc_seq_start, 2475 .next = igmp_mc_seq_next, 2476 .stop = igmp_mc_seq_stop, 2477 .show = igmp_mc_seq_show, 2478}; 2479 2480static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2481{ 2482 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2483 sizeof(struct igmp_mc_iter_state)); 2484} 2485 2486static const struct file_operations igmp_mc_seq_fops = { 2487 .owner = THIS_MODULE, 2488 .open = igmp_mc_seq_open, 2489 .read = seq_read, 2490 .llseek = seq_lseek, 2491 .release = seq_release_net, 2492}; 2493 2494struct igmp_mcf_iter_state { 2495 struct seq_net_private p; 2496 struct net_device *dev; 2497 struct in_device *idev; 2498 struct ip_mc_list *im; 2499}; 2500 2501#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2502 2503static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2504{ 2505 struct net *net = seq_file_net(seq); 2506 struct ip_sf_list *psf = NULL; 2507 struct ip_mc_list *im = NULL; 2508 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2509 2510 state->idev = NULL; 2511 state->im = NULL; 2512 for_each_netdev_rcu(net, state->dev) { 2513 struct in_device *idev; 2514 idev = __in_dev_get_rcu(state->dev); 2515 if (unlikely(idev == NULL)) 2516 continue; 2517 im = rcu_dereference(idev->mc_list); 2518 if (likely(im != NULL)) { 2519 spin_lock_bh(&im->lock); 2520 psf = im->sources; 2521 if (likely(psf != NULL)) { 2522 state->im = im; 2523 state->idev = idev; 2524 break; 2525 } 2526 spin_unlock_bh(&im->lock); 2527 } 2528 } 2529 return psf; 2530} 2531 2532static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2533{ 2534 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2535 2536 psf = psf->sf_next; 2537 while (!psf) { 2538 spin_unlock_bh(&state->im->lock); 2539 state->im = state->im->next; 2540 while (!state->im) { 2541 state->dev = next_net_device_rcu(state->dev); 2542 if (!state->dev) { 2543 state->idev = NULL; 2544 goto out; 2545 } 2546 state->idev = __in_dev_get_rcu(state->dev); 2547 if (!state->idev) 2548 continue; 2549 state->im = rcu_dereference(state->idev->mc_list); 2550 } 2551 if (!state->im) 2552 break; 2553 spin_lock_bh(&state->im->lock); 2554 psf = state->im->sources; 2555 } 2556out: 2557 return psf; 2558} 2559 2560static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2561{ 2562 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2563 if (psf) 2564 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2565 --pos; 2566 return pos ? NULL : psf; 2567} 2568 2569static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2570 __acquires(rcu) 2571{ 2572 rcu_read_lock(); 2573 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2574} 2575 2576static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2577{ 2578 struct ip_sf_list *psf; 2579 if (v == SEQ_START_TOKEN) 2580 psf = igmp_mcf_get_first(seq); 2581 else 2582 psf = igmp_mcf_get_next(seq, v); 2583 ++*pos; 2584 return psf; 2585} 2586 2587static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2588 __releases(rcu) 2589{ 2590 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2591 if (likely(state->im != NULL)) { 2592 spin_unlock_bh(&state->im->lock); 2593 state->im = NULL; 2594 } 2595 state->idev = NULL; 2596 state->dev = NULL; 2597 rcu_read_unlock(); 2598} 2599 2600static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2601{ 2602 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2603 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2604 2605 if (v == SEQ_START_TOKEN) { 2606 seq_printf(seq, 2607 "%3s %6s " 2608 "%10s %10s %6s %6s\n", "Idx", 2609 "Device", "MCA", 2610 "SRC", "INC", "EXC"); 2611 } else { 2612 seq_printf(seq, 2613 "%3d %6.6s 0x%08x " 2614 "0x%08x %6lu %6lu\n", 2615 state->dev->ifindex, state->dev->name, 2616 ntohl(state->im->multiaddr), 2617 ntohl(psf->sf_inaddr), 2618 psf->sf_count[MCAST_INCLUDE], 2619 psf->sf_count[MCAST_EXCLUDE]); 2620 } 2621 return 0; 2622} 2623 2624static const struct seq_operations igmp_mcf_seq_ops = { 2625 .start = igmp_mcf_seq_start, 2626 .next = igmp_mcf_seq_next, 2627 .stop = igmp_mcf_seq_stop, 2628 .show = igmp_mcf_seq_show, 2629}; 2630 2631static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2632{ 2633 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2634 sizeof(struct igmp_mcf_iter_state)); 2635} 2636 2637static const struct file_operations igmp_mcf_seq_fops = { 2638 .owner = THIS_MODULE, 2639 .open = igmp_mcf_seq_open, 2640 .read = seq_read, 2641 .llseek = seq_lseek, 2642 .release = seq_release_net, 2643}; 2644 2645static int __net_init igmp_net_init(struct net *net) 2646{ 2647 struct proc_dir_entry *pde; 2648 2649 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2650 if (!pde) 2651 goto out_igmp; 2652 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2653 if (!pde) 2654 goto out_mcfilter; 2655 return 0; 2656 2657out_mcfilter: 2658 proc_net_remove(net, "igmp"); 2659out_igmp: 2660 return -ENOMEM; 2661} 2662 2663static void __net_exit igmp_net_exit(struct net *net) 2664{ 2665 proc_net_remove(net, "mcfilter"); 2666 proc_net_remove(net, "igmp"); 2667} 2668 2669static struct pernet_operations igmp_net_ops = { 2670 .init = igmp_net_init, 2671 .exit = igmp_net_exit, 2672}; 2673 2674int __init igmp_mc_proc_init(void) 2675{ 2676 return register_pernet_subsys(&igmp_net_ops); 2677} 2678#endif 2679