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 <asm/system.h> 77#include <linux/types.h> 78#include <linux/kernel.h> 79#include <linux/jiffies.h> 80#include <linux/string.h> 81#include <linux/socket.h> 82#include <linux/sockios.h> 83#include <linux/in.h> 84#include <linux/inet.h> 85#include <linux/netdevice.h> 86#include <linux/skbuff.h> 87#include <linux/inetdevice.h> 88#include <linux/igmp.h> 89#include <linux/if_arp.h> 90#include <linux/rtnetlink.h> 91#include <linux/times.h> 92 93#include <net/net_namespace.h> 94#include <net/arp.h> 95#include <net/ip.h> 96#include <net/protocol.h> 97#include <net/route.h> 98#include <net/sock.h> 99#include <net/checksum.h> 100#include <linux/netfilter_ipv4.h> 101#ifdef CONFIG_IP_MROUTE 102#include <linux/mroute.h> 103#endif 104#ifdef CONFIG_PROC_FS 105#include <linux/proc_fs.h> 106#include <linux/seq_file.h> 107#endif 108 109#define IP_MAX_MEMBERSHIPS 20 110#define IP_MAX_MSF 10 111 112#ifdef CONFIG_IP_MULTICAST 113/* Parameter names and values are taken from igmp-v2-06 draft */ 114 115#define IGMP_V1_Router_Present_Timeout (400*HZ) 116#define IGMP_V2_Router_Present_Timeout (400*HZ) 117#define IGMP_Unsolicited_Report_Interval (10*HZ) 118#define IGMP_Query_Response_Interval (10*HZ) 119#define IGMP_Unsolicited_Report_Count 2 120 121 122#define IGMP_Initial_Report_Delay (1) 123 124/* IGMP_Initial_Report_Delay is not from IGMP specs! 125 * IGMP specs require to report membership immediately after 126 * joining a group, but we delay the first report by a 127 * small interval. It seems more natural and still does not 128 * contradict to specs provided this delay is small enough. 129 */ 130 131#define IGMP_V1_SEEN(in_dev) \ 132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 134 ((in_dev)->mr_v1_seen && \ 135 time_before(jiffies, (in_dev)->mr_v1_seen))) 136#define IGMP_V2_SEEN(in_dev) \ 137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 139 ((in_dev)->mr_v2_seen && \ 140 time_before(jiffies, (in_dev)->mr_v2_seen))) 141 142static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 143static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 144static void igmpv3_clear_delrec(struct in_device *in_dev); 145static int sf_setstate(struct ip_mc_list *pmc); 146static void sf_markstate(struct ip_mc_list *pmc); 147#endif 148static void ip_mc_clear_src(struct ip_mc_list *pmc); 149static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 150 int sfcount, __be32 *psfsrc, int delta); 151 152static void ip_ma_put(struct ip_mc_list *im) 153{ 154 if (atomic_dec_and_test(&im->refcnt)) { 155 in_dev_put(im->interface); 156 kfree(im); 157 } 158} 159 160#ifdef CONFIG_IP_MULTICAST 161 162/* 163 * Timer management 164 */ 165 166static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 167{ 168 spin_lock_bh(&im->lock); 169 if (del_timer(&im->timer)) 170 atomic_dec(&im->refcnt); 171 im->tm_running = 0; 172 im->reporter = 0; 173 im->unsolicit_count = 0; 174 spin_unlock_bh(&im->lock); 175} 176 177/* It must be called with locked im->lock */ 178static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 179{ 180 int tv = net_random() % max_delay; 181 182 im->tm_running = 1; 183 if (!mod_timer(&im->timer, jiffies+tv+2)) 184 atomic_inc(&im->refcnt); 185} 186 187static void igmp_gq_start_timer(struct in_device *in_dev) 188{ 189 int tv = net_random() % in_dev->mr_maxdelay; 190 191 in_dev->mr_gq_running = 1; 192 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 193 in_dev_hold(in_dev); 194} 195 196static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 197{ 198 int tv = net_random() % delay; 199 200 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 201 in_dev_hold(in_dev); 202} 203 204static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 205{ 206 spin_lock_bh(&im->lock); 207 im->unsolicit_count = 0; 208 if (del_timer(&im->timer)) { 209 if ((long)(im->timer.expires-jiffies) < max_delay) { 210 add_timer(&im->timer); 211 im->tm_running = 1; 212 spin_unlock_bh(&im->lock); 213 return; 214 } 215 atomic_dec(&im->refcnt); 216 } 217 igmp_start_timer(im, max_delay); 218 spin_unlock_bh(&im->lock); 219} 220 221 222/* 223 * Send an IGMP report. 224 */ 225 226#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 227 228 229static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 230 int gdeleted, int sdeleted) 231{ 232 switch (type) { 233 case IGMPV3_MODE_IS_INCLUDE: 234 case IGMPV3_MODE_IS_EXCLUDE: 235 if (gdeleted || sdeleted) 236 return 0; 237 if (!(pmc->gsquery && !psf->sf_gsresp)) { 238 if (pmc->sfmode == MCAST_INCLUDE) 239 return 1; 240 /* don't include if this source is excluded 241 * in all filters 242 */ 243 if (psf->sf_count[MCAST_INCLUDE]) 244 return type == IGMPV3_MODE_IS_INCLUDE; 245 return pmc->sfcount[MCAST_EXCLUDE] == 246 psf->sf_count[MCAST_EXCLUDE]; 247 } 248 return 0; 249 case IGMPV3_CHANGE_TO_INCLUDE: 250 if (gdeleted || sdeleted) 251 return 0; 252 return psf->sf_count[MCAST_INCLUDE] != 0; 253 case IGMPV3_CHANGE_TO_EXCLUDE: 254 if (gdeleted || sdeleted) 255 return 0; 256 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 257 psf->sf_count[MCAST_INCLUDE]) 258 return 0; 259 return pmc->sfcount[MCAST_EXCLUDE] == 260 psf->sf_count[MCAST_EXCLUDE]; 261 case IGMPV3_ALLOW_NEW_SOURCES: 262 if (gdeleted || !psf->sf_crcount) 263 return 0; 264 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 265 case IGMPV3_BLOCK_OLD_SOURCES: 266 if (pmc->sfmode == MCAST_INCLUDE) 267 return gdeleted || (psf->sf_crcount && sdeleted); 268 return psf->sf_crcount && !gdeleted && !sdeleted; 269 } 270 return 0; 271} 272 273static int 274igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 275{ 276 struct ip_sf_list *psf; 277 int scount = 0; 278 279 for (psf=pmc->sources; psf; psf=psf->sf_next) { 280 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 281 continue; 282 scount++; 283 } 284 return scount; 285} 286 287static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 288{ 289 struct sk_buff *skb; 290 struct rtable *rt; 291 struct iphdr *pip; 292 struct igmpv3_report *pig; 293 struct net *net = dev_net(dev); 294 295 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 296 if (skb == NULL) 297 return NULL; 298 299 { 300 struct flowi fl = { .oif = dev->ifindex, 301 .nl_u = { .ip4_u = { 302 .daddr = IGMPV3_ALL_MCR } }, 303 .proto = IPPROTO_IGMP }; 304 if (ip_route_output_key(net, &rt, &fl)) { 305 kfree_skb(skb); 306 return NULL; 307 } 308 } 309 if (rt->rt_src == 0) { 310 kfree_skb(skb); 311 ip_rt_put(rt); 312 return NULL; 313 } 314 315 skb_dst_set(skb, &rt->dst); 316 skb->dev = dev; 317 318 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 319 320 skb_reset_network_header(skb); 321 pip = ip_hdr(skb); 322 skb_put(skb, sizeof(struct iphdr) + 4); 323 324 pip->version = 4; 325 pip->ihl = (sizeof(struct iphdr)+4)>>2; 326 pip->tos = 0xc0; 327 pip->frag_off = htons(IP_DF); 328 pip->ttl = 1; 329 pip->daddr = rt->rt_dst; 330 pip->saddr = rt->rt_src; 331 pip->protocol = IPPROTO_IGMP; 332 pip->tot_len = 0; /* filled in later */ 333 ip_select_ident(pip, &rt->dst, NULL); 334 ((u8*)&pip[1])[0] = IPOPT_RA; 335 ((u8*)&pip[1])[1] = 4; 336 ((u8*)&pip[1])[2] = 0; 337 ((u8*)&pip[1])[3] = 0; 338 339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 340 skb_put(skb, sizeof(*pig)); 341 pig = igmpv3_report_hdr(skb); 342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 343 pig->resv1 = 0; 344 pig->csum = 0; 345 pig->resv2 = 0; 346 pig->ngrec = 0; 347 return skb; 348} 349 350static int igmpv3_sendpack(struct sk_buff *skb) 351{ 352 struct igmphdr *pig = igmp_hdr(skb); 353 const int igmplen = skb->tail - skb->transport_header; 354 355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 356 357 return ip_local_out(skb); 358} 359 360static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 361{ 362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 363} 364 365static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 366 int type, struct igmpv3_grec **ppgr) 367{ 368 struct net_device *dev = pmc->interface->dev; 369 struct igmpv3_report *pih; 370 struct igmpv3_grec *pgr; 371 372 if (!skb) 373 skb = igmpv3_newpack(dev, dev->mtu); 374 if (!skb) 375 return NULL; 376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 377 pgr->grec_type = type; 378 pgr->grec_auxwords = 0; 379 pgr->grec_nsrcs = 0; 380 pgr->grec_mca = pmc->multiaddr; 381 pih = igmpv3_report_hdr(skb); 382 pih->ngrec = htons(ntohs(pih->ngrec)+1); 383 *ppgr = pgr; 384 return skb; 385} 386 387#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 388 skb_tailroom(skb)) : 0) 389 390static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 391 int type, int gdeleted, int sdeleted) 392{ 393 struct net_device *dev = pmc->interface->dev; 394 struct igmpv3_report *pih; 395 struct igmpv3_grec *pgr = NULL; 396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 397 int scount, stotal, first, isquery, truncate; 398 399 if (pmc->multiaddr == IGMP_ALL_HOSTS) 400 return skb; 401 402 isquery = type == IGMPV3_MODE_IS_INCLUDE || 403 type == IGMPV3_MODE_IS_EXCLUDE; 404 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 405 type == IGMPV3_CHANGE_TO_EXCLUDE; 406 407 stotal = scount = 0; 408 409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 410 411 if (!*psf_list) 412 goto empty_source; 413 414 pih = skb ? igmpv3_report_hdr(skb) : NULL; 415 416 /* EX and TO_EX get a fresh packet, if needed */ 417 if (truncate) { 418 if (pih && pih->ngrec && 419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 420 if (skb) 421 igmpv3_sendpack(skb); 422 skb = igmpv3_newpack(dev, dev->mtu); 423 } 424 } 425 first = 1; 426 psf_prev = NULL; 427 for (psf=*psf_list; psf; psf=psf_next) { 428 __be32 *psrc; 429 430 psf_next = psf->sf_next; 431 432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 433 psf_prev = psf; 434 continue; 435 } 436 437 /* clear marks on query responses */ 438 if (isquery) 439 psf->sf_gsresp = 0; 440 441 if (AVAILABLE(skb) < sizeof(__be32) + 442 first*sizeof(struct igmpv3_grec)) { 443 if (truncate && !first) 444 break; /* truncate these */ 445 if (pgr) 446 pgr->grec_nsrcs = htons(scount); 447 if (skb) 448 igmpv3_sendpack(skb); 449 skb = igmpv3_newpack(dev, dev->mtu); 450 first = 1; 451 scount = 0; 452 } 453 if (first) { 454 skb = add_grhead(skb, pmc, type, &pgr); 455 first = 0; 456 } 457 if (!skb) 458 return NULL; 459 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 460 *psrc = psf->sf_inaddr; 461 scount++; stotal++; 462 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 464 psf->sf_crcount--; 465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 466 if (psf_prev) 467 psf_prev->sf_next = psf->sf_next; 468 else 469 *psf_list = psf->sf_next; 470 kfree(psf); 471 continue; 472 } 473 } 474 psf_prev = psf; 475 } 476 477empty_source: 478 if (!stotal) { 479 if (type == IGMPV3_ALLOW_NEW_SOURCES || 480 type == IGMPV3_BLOCK_OLD_SOURCES) 481 return skb; 482 if (pmc->crcount || isquery) { 483 /* make sure we have room for group header */ 484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 485 igmpv3_sendpack(skb); 486 skb = NULL; /* add_grhead will get a new one */ 487 } 488 skb = add_grhead(skb, pmc, type, &pgr); 489 } 490 } 491 if (pgr) 492 pgr->grec_nsrcs = htons(scount); 493 494 if (isquery) 495 pmc->gsquery = 0; /* clear query state on report */ 496 return skb; 497} 498 499static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 500{ 501 struct sk_buff *skb = NULL; 502 int type; 503 504#if 0 505 /* foxconn added start, zacker, 11/19/2010 */ 506 /* not to let kernel send igmp packets */ 507#ifdef IGMP_PROXY 508 return 0; 509#endif 510 /* foxconn added end, zacker, 11/19/2010 */ 511#endif 512 513 if (!pmc) { 514 read_lock(&in_dev->mc_list_lock); 515 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 516 if (pmc->multiaddr == IGMP_ALL_HOSTS) 517 continue; 518 spin_lock_bh(&pmc->lock); 519 if (pmc->sfcount[MCAST_EXCLUDE]) 520 type = IGMPV3_MODE_IS_EXCLUDE; 521 else 522 type = IGMPV3_MODE_IS_INCLUDE; 523 skb = add_grec(skb, pmc, type, 0, 0); 524 spin_unlock_bh(&pmc->lock); 525 } 526 read_unlock(&in_dev->mc_list_lock); 527 } else { 528 spin_lock_bh(&pmc->lock); 529 if (pmc->sfcount[MCAST_EXCLUDE]) 530 type = IGMPV3_MODE_IS_EXCLUDE; 531 else 532 type = IGMPV3_MODE_IS_INCLUDE; 533 skb = add_grec(skb, pmc, type, 0, 0); 534 spin_unlock_bh(&pmc->lock); 535 } 536 if (!skb) 537 return 0; 538 return igmpv3_sendpack(skb); 539} 540 541/* 542 * remove zero-count source records from a source filter list 543 */ 544static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 545{ 546 struct ip_sf_list *psf_prev, *psf_next, *psf; 547 548 psf_prev = NULL; 549 for (psf=*ppsf; psf; psf = psf_next) { 550 psf_next = psf->sf_next; 551 if (psf->sf_crcount == 0) { 552 if (psf_prev) 553 psf_prev->sf_next = psf->sf_next; 554 else 555 *ppsf = psf->sf_next; 556 kfree(psf); 557 } else 558 psf_prev = psf; 559 } 560} 561 562static void igmpv3_send_cr(struct in_device *in_dev) 563{ 564 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 565 struct sk_buff *skb = NULL; 566 int type, dtype; 567 568#if 0 569 /* foxconn added start, zacker, 11/19/2010 */ 570 /* not to let kernel send igmp packets */ 571#ifdef IGMP_PROXY 572 return; 573#endif 574 /* foxconn added end, zacker, 11/19/2010 */ 575#endif 576 577 read_lock(&in_dev->mc_list_lock); 578 spin_lock_bh(&in_dev->mc_tomb_lock); 579 580 /* deleted MCA's */ 581 pmc_prev = NULL; 582 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 583 pmc_next = pmc->next; 584 if (pmc->sfmode == MCAST_INCLUDE) { 585 type = IGMPV3_BLOCK_OLD_SOURCES; 586 dtype = IGMPV3_BLOCK_OLD_SOURCES; 587 skb = add_grec(skb, pmc, type, 1, 0); 588 skb = add_grec(skb, pmc, dtype, 1, 1); 589 } 590 if (pmc->crcount) { 591 if (pmc->sfmode == MCAST_EXCLUDE) { 592 type = IGMPV3_CHANGE_TO_INCLUDE; 593 skb = add_grec(skb, pmc, type, 1, 0); 594 } 595 pmc->crcount--; 596 if (pmc->crcount == 0) { 597 igmpv3_clear_zeros(&pmc->tomb); 598 igmpv3_clear_zeros(&pmc->sources); 599 } 600 } 601 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 602 if (pmc_prev) 603 pmc_prev->next = pmc_next; 604 else 605 in_dev->mc_tomb = pmc_next; 606 in_dev_put(pmc->interface); 607 kfree(pmc); 608 } else 609 pmc_prev = pmc; 610 } 611 spin_unlock_bh(&in_dev->mc_tomb_lock); 612 613 /* change recs */ 614 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 615 spin_lock_bh(&pmc->lock); 616 if (pmc->sfcount[MCAST_EXCLUDE]) { 617 type = IGMPV3_BLOCK_OLD_SOURCES; 618 dtype = IGMPV3_ALLOW_NEW_SOURCES; 619 } else { 620 type = IGMPV3_ALLOW_NEW_SOURCES; 621 dtype = IGMPV3_BLOCK_OLD_SOURCES; 622 } 623 skb = add_grec(skb, pmc, type, 0, 0); 624 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 625 626 /* filter mode changes */ 627 if (pmc->crcount) { 628 if (pmc->sfmode == MCAST_EXCLUDE) 629 type = IGMPV3_CHANGE_TO_EXCLUDE; 630 else 631 type = IGMPV3_CHANGE_TO_INCLUDE; 632 skb = add_grec(skb, pmc, type, 0, 0); 633 pmc->crcount--; 634 } 635 spin_unlock_bh(&pmc->lock); 636 } 637 read_unlock(&in_dev->mc_list_lock); 638 639 if (!skb) 640 return; 641 (void) igmpv3_sendpack(skb); 642} 643 644static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 645 int type) 646{ 647 struct sk_buff *skb; 648 struct iphdr *iph; 649 struct igmphdr *ih; 650 struct rtable *rt; 651 struct net_device *dev = in_dev->dev; 652 struct net *net = dev_net(dev); 653 __be32 group = pmc ? pmc->multiaddr : 0; 654 __be32 dst; 655 656#if 0 657 /* foxconn added start, zacker, 11/19/2010 */ 658 /* not to let kernel send igmp packets */ 659#ifdef IGMP_PROXY 660 return 0; 661#endif 662 /* foxconn added end, zacker, 11/19/2010 */ 663#endif 664 665 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 666 return igmpv3_send_report(in_dev, pmc); 667 else if (type == IGMP_HOST_LEAVE_MESSAGE) 668 dst = IGMP_ALL_ROUTER; 669 else 670 dst = group; 671 672 { 673 struct flowi fl = { .oif = dev->ifindex, 674 .nl_u = { .ip4_u = { .daddr = dst } }, 675 .proto = IPPROTO_IGMP }; 676 if (ip_route_output_key(net, &rt, &fl)) 677 return -1; 678 } 679 if (rt->rt_src == 0) { 680 ip_rt_put(rt); 681 return -1; 682 } 683 684 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 685 if (skb == NULL) { 686 ip_rt_put(rt); 687 return -1; 688 } 689 690 skb_dst_set(skb, &rt->dst); 691 692 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 693 694 skb_reset_network_header(skb); 695 iph = ip_hdr(skb); 696 skb_put(skb, sizeof(struct iphdr) + 4); 697 698 iph->version = 4; 699 iph->ihl = (sizeof(struct iphdr)+4)>>2; 700 iph->tos = 0xc0; 701 iph->frag_off = htons(IP_DF); 702 iph->ttl = 1; 703 iph->daddr = dst; 704 iph->saddr = rt->rt_src; 705 iph->protocol = IPPROTO_IGMP; 706 ip_select_ident(iph, &rt->dst, NULL); 707 ((u8*)&iph[1])[0] = IPOPT_RA; 708 ((u8*)&iph[1])[1] = 4; 709 ((u8*)&iph[1])[2] = 0; 710 ((u8*)&iph[1])[3] = 0; 711 712 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 713 ih->type = type; 714 ih->code = 0; 715 ih->csum = 0; 716 ih->group = group; 717 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 718 719 return ip_local_out(skb); 720} 721 722static void igmp_gq_timer_expire(unsigned long data) 723{ 724 struct in_device *in_dev = (struct in_device *)data; 725 726 in_dev->mr_gq_running = 0; 727 igmpv3_send_report(in_dev, NULL); 728 __in_dev_put(in_dev); 729} 730 731static void igmp_ifc_timer_expire(unsigned long data) 732{ 733 struct in_device *in_dev = (struct in_device *)data; 734 735 igmpv3_send_cr(in_dev); 736 if (in_dev->mr_ifc_count) { 737 in_dev->mr_ifc_count--; 738 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 739 } 740 __in_dev_put(in_dev); 741} 742 743static void igmp_ifc_event(struct in_device *in_dev) 744{ 745 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 746 return; 747 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 748 IGMP_Unsolicited_Report_Count; 749 igmp_ifc_start_timer(in_dev, 1); 750} 751 752 753static void igmp_timer_expire(unsigned long data) 754{ 755 struct ip_mc_list *im=(struct ip_mc_list *)data; 756 struct in_device *in_dev = im->interface; 757 758 spin_lock(&im->lock); 759 im->tm_running = 0; 760 761 if (im->unsolicit_count) { 762 im->unsolicit_count--; 763 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 764 } 765 im->reporter = 1; 766 spin_unlock(&im->lock); 767 768 if (IGMP_V1_SEEN(in_dev)) 769 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 770 else if (IGMP_V2_SEEN(in_dev)) 771 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 772 else 773 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 774 775 ip_ma_put(im); 776} 777 778/* mark EXCLUDE-mode sources */ 779static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 780{ 781 struct ip_sf_list *psf; 782 int i, scount; 783 784 scount = 0; 785 for (psf=pmc->sources; psf; psf=psf->sf_next) { 786 if (scount == nsrcs) 787 break; 788 for (i=0; i<nsrcs; i++) { 789 /* skip inactive filters */ 790 if (pmc->sfcount[MCAST_INCLUDE] || 791 pmc->sfcount[MCAST_EXCLUDE] != 792 psf->sf_count[MCAST_EXCLUDE]) 793 continue; 794 if (srcs[i] == psf->sf_inaddr) { 795 scount++; 796 break; 797 } 798 } 799 } 800 pmc->gsquery = 0; 801 if (scount == nsrcs) /* all sources excluded */ 802 return 0; 803 return 1; 804} 805 806static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 807{ 808 struct ip_sf_list *psf; 809 int i, scount; 810 811 if (pmc->sfmode == MCAST_EXCLUDE) 812 return igmp_xmarksources(pmc, nsrcs, srcs); 813 814 /* mark INCLUDE-mode sources */ 815 scount = 0; 816 for (psf=pmc->sources; psf; psf=psf->sf_next) { 817 if (scount == nsrcs) 818 break; 819 for (i=0; i<nsrcs; i++) 820 if (srcs[i] == psf->sf_inaddr) { 821 psf->sf_gsresp = 1; 822 scount++; 823 break; 824 } 825 } 826 if (!scount) { 827 pmc->gsquery = 0; 828 return 0; 829 } 830 pmc->gsquery = 1; 831 return 1; 832} 833 834static void igmp_heard_report(struct in_device *in_dev, __be32 group) 835{ 836 struct ip_mc_list *im; 837 838 /* Timers are only set for non-local groups */ 839 840 if (group == IGMP_ALL_HOSTS) 841 return; 842 843 read_lock(&in_dev->mc_list_lock); 844 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 845 if (im->multiaddr == group) { 846 igmp_stop_timer(im); 847 break; 848 } 849 } 850 read_unlock(&in_dev->mc_list_lock); 851} 852 853static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 854 int len) 855{ 856 struct igmphdr *ih = igmp_hdr(skb); 857 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 858 struct ip_mc_list *im; 859 __be32 group = ih->group; 860 int max_delay; 861 int mark = 0; 862 863 864 if (len == 8) { 865 if (ih->code == 0) { 866 /* Alas, old v1 router presents here. */ 867 868 max_delay = IGMP_Query_Response_Interval; 869 in_dev->mr_v1_seen = jiffies + 870 IGMP_V1_Router_Present_Timeout; 871 group = 0; 872 } else { 873 /* v2 router present */ 874 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 875 in_dev->mr_v2_seen = jiffies + 876 IGMP_V2_Router_Present_Timeout; 877 } 878 /* cancel the interface change timer */ 879 in_dev->mr_ifc_count = 0; 880 if (del_timer(&in_dev->mr_ifc_timer)) 881 __in_dev_put(in_dev); 882 /* clear deleted report items */ 883 igmpv3_clear_delrec(in_dev); 884 } else if (len < 12) { 885 return; /* ignore bogus packet; freed by caller */ 886 } else if (IGMP_V1_SEEN(in_dev)) { 887 /* This is a v3 query with v1 queriers present */ 888 max_delay = IGMP_Query_Response_Interval; 889 group = 0; 890 } else if (IGMP_V2_SEEN(in_dev)) { 891 /* this is a v3 query with v2 queriers present; 892 * Interpretation of the max_delay code is problematic here. 893 * A real v2 host would use ih_code directly, while v3 has a 894 * different encoding. We use the v3 encoding as more likely 895 * to be intended in a v3 query. 896 */ 897 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 898 } else { /* v3 */ 899 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 900 return; 901 902 ih3 = igmpv3_query_hdr(skb); 903 if (ih3->nsrcs) { 904 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 905 + ntohs(ih3->nsrcs)*sizeof(__be32))) 906 return; 907 ih3 = igmpv3_query_hdr(skb); 908 } 909 910 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 911 if (!max_delay) 912 max_delay = 1; /* can't mod w/ 0 */ 913 in_dev->mr_maxdelay = max_delay; 914 if (ih3->qrv) 915 in_dev->mr_qrv = ih3->qrv; 916 if (!group) { /* general query */ 917 if (ih3->nsrcs) 918 return; /* no sources allowed */ 919 igmp_gq_start_timer(in_dev); 920 return; 921 } 922 /* mark sources to include, if group & source-specific */ 923 mark = ih3->nsrcs != 0; 924 } 925 926 /* 927 * - Start the timers in all of our membership records 928 * that the query applies to for the interface on 929 * which the query arrived excl. those that belong 930 * to a "local" group (224.0.0.X) 931 * - For timers already running check if they need to 932 * be reset. 933 * - Use the igmp->igmp_code field as the maximum 934 * delay possible 935 */ 936 read_lock(&in_dev->mc_list_lock); 937 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 938 int changed; 939 940 if (group && group != im->multiaddr) 941 continue; 942 if (im->multiaddr == IGMP_ALL_HOSTS) 943 continue; 944 spin_lock_bh(&im->lock); 945 if (im->tm_running) 946 im->gsquery = im->gsquery && mark; 947 else 948 im->gsquery = mark; 949 changed = !im->gsquery || 950 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 951 spin_unlock_bh(&im->lock); 952 if (changed) 953 igmp_mod_timer(im, max_delay); 954 } 955 read_unlock(&in_dev->mc_list_lock); 956} 957 958/* called in rcu_read_lock() section */ 959int igmp_rcv(struct sk_buff *skb) 960{ 961 /* This basically follows the spec line by line -- see RFC1112 */ 962 struct igmphdr *ih; 963 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 964 int len = skb->len; 965 966 if (in_dev == NULL) 967 goto drop; 968 969 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 970 goto drop; 971 972 switch (skb->ip_summed) { 973 case CHECKSUM_COMPLETE: 974 if (!csum_fold(skb->csum)) 975 break; 976 /* fall through */ 977 case CHECKSUM_NONE: 978 skb->csum = 0; 979 if (__skb_checksum_complete(skb)) 980 goto drop; 981 } 982 983 ih = igmp_hdr(skb); 984 switch (ih->type) { 985 case IGMP_HOST_MEMBERSHIP_QUERY: 986 igmp_heard_query(in_dev, skb, len); 987 break; 988 case IGMP_HOST_MEMBERSHIP_REPORT: 989 case IGMPV2_HOST_MEMBERSHIP_REPORT: 990 /* Is it our report looped back? */ 991 if (skb_rtable(skb)->fl.iif == 0) 992 break; 993 /* don't rely on MC router hearing unicast reports */ 994 if (skb->pkt_type == PACKET_MULTICAST || 995 skb->pkt_type == PACKET_BROADCAST) 996 igmp_heard_report(in_dev, ih->group); 997 break; 998 case IGMP_PIM: 999#ifdef CONFIG_IP_PIMSM_V1 1000 return pim_rcv_v1(skb); 1001#endif 1002 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1003 case IGMP_DVMRP: 1004 case IGMP_TRACE: 1005 case IGMP_HOST_LEAVE_MESSAGE: 1006 case IGMP_MTRACE: 1007 case IGMP_MTRACE_RESP: 1008 break; 1009 default: 1010 break; 1011 } 1012 1013drop: 1014 kfree_skb(skb); 1015 return 0; 1016} 1017 1018#endif 1019 1020 1021/* 1022 * Add a filter to a device 1023 */ 1024 1025static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1026{ 1027 char buf[MAX_ADDR_LEN]; 1028 struct net_device *dev = in_dev->dev; 1029 1030 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1031 We will get multicast token leakage, when IFF_MULTICAST 1032 is changed. This check should be done in dev->set_multicast_list 1033 routine. Something sort of: 1034 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1035 --ANK 1036 */ 1037 if (arp_mc_map(addr, buf, dev, 0) == 0) 1038 dev_mc_add(dev, buf); 1039} 1040 1041/* 1042 * Remove a filter from a device 1043 */ 1044 1045static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1046{ 1047 char buf[MAX_ADDR_LEN]; 1048 struct net_device *dev = in_dev->dev; 1049 1050 if (arp_mc_map(addr, buf, dev, 0) == 0) 1051 dev_mc_del(dev, buf); 1052} 1053 1054#ifdef CONFIG_IP_MULTICAST 1055/* 1056 * deleted ip_mc_list manipulation 1057 */ 1058static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1059{ 1060 struct ip_mc_list *pmc; 1061 1062 /* this is an "ip_mc_list" for convenience; only the fields below 1063 * are actually used. In particular, the refcnt and users are not 1064 * used for management of the delete list. Using the same structure 1065 * for deleted items allows change reports to use common code with 1066 * non-deleted or query-response MCA's. 1067 */ 1068 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1069 if (!pmc) 1070 return; 1071 spin_lock_bh(&im->lock); 1072 pmc->interface = im->interface; 1073 in_dev_hold(in_dev); 1074 pmc->multiaddr = im->multiaddr; 1075 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1076 IGMP_Unsolicited_Report_Count; 1077 pmc->sfmode = im->sfmode; 1078 if (pmc->sfmode == MCAST_INCLUDE) { 1079 struct ip_sf_list *psf; 1080 1081 pmc->tomb = im->tomb; 1082 pmc->sources = im->sources; 1083 im->tomb = im->sources = NULL; 1084 for (psf=pmc->sources; psf; psf=psf->sf_next) 1085 psf->sf_crcount = pmc->crcount; 1086 } 1087 spin_unlock_bh(&im->lock); 1088 1089 spin_lock_bh(&in_dev->mc_tomb_lock); 1090 pmc->next = in_dev->mc_tomb; 1091 in_dev->mc_tomb = pmc; 1092 spin_unlock_bh(&in_dev->mc_tomb_lock); 1093} 1094 1095static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1096{ 1097 struct ip_mc_list *pmc, *pmc_prev; 1098 struct ip_sf_list *psf, *psf_next; 1099 1100 spin_lock_bh(&in_dev->mc_tomb_lock); 1101 pmc_prev = NULL; 1102 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1103 if (pmc->multiaddr == multiaddr) 1104 break; 1105 pmc_prev = pmc; 1106 } 1107 if (pmc) { 1108 if (pmc_prev) 1109 pmc_prev->next = pmc->next; 1110 else 1111 in_dev->mc_tomb = pmc->next; 1112 } 1113 spin_unlock_bh(&in_dev->mc_tomb_lock); 1114 if (pmc) { 1115 for (psf=pmc->tomb; psf; psf=psf_next) { 1116 psf_next = psf->sf_next; 1117 kfree(psf); 1118 } 1119 in_dev_put(pmc->interface); 1120 kfree(pmc); 1121 } 1122} 1123 1124static void igmpv3_clear_delrec(struct in_device *in_dev) 1125{ 1126 struct ip_mc_list *pmc, *nextpmc; 1127 1128 spin_lock_bh(&in_dev->mc_tomb_lock); 1129 pmc = in_dev->mc_tomb; 1130 in_dev->mc_tomb = NULL; 1131 spin_unlock_bh(&in_dev->mc_tomb_lock); 1132 1133 for (; pmc; pmc = nextpmc) { 1134 nextpmc = pmc->next; 1135 ip_mc_clear_src(pmc); 1136 in_dev_put(pmc->interface); 1137 kfree(pmc); 1138 } 1139 /* clear dead sources, too */ 1140 read_lock(&in_dev->mc_list_lock); 1141 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1142 struct ip_sf_list *psf, *psf_next; 1143 1144 spin_lock_bh(&pmc->lock); 1145 psf = pmc->tomb; 1146 pmc->tomb = NULL; 1147 spin_unlock_bh(&pmc->lock); 1148 for (; psf; psf=psf_next) { 1149 psf_next = psf->sf_next; 1150 kfree(psf); 1151 } 1152 } 1153 read_unlock(&in_dev->mc_list_lock); 1154} 1155#endif 1156 1157static void igmp_group_dropped(struct ip_mc_list *im) 1158{ 1159 struct in_device *in_dev = im->interface; 1160#ifdef CONFIG_IP_MULTICAST 1161 int reporter; 1162#endif 1163 1164 if (im->loaded) { 1165 im->loaded = 0; 1166 ip_mc_filter_del(in_dev, im->multiaddr); 1167 } 1168 1169#ifdef CONFIG_IP_MULTICAST 1170 if (im->multiaddr == IGMP_ALL_HOSTS) 1171 return; 1172 1173 reporter = im->reporter; 1174 igmp_stop_timer(im); 1175 1176 if (!in_dev->dead) { 1177 if (IGMP_V1_SEEN(in_dev)) 1178 goto done; 1179 if (IGMP_V2_SEEN(in_dev)) { 1180 if (reporter) 1181 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1182 goto done; 1183 } 1184 /* IGMPv3 */ 1185 igmpv3_add_delrec(in_dev, im); 1186 1187 igmp_ifc_event(in_dev); 1188 } 1189done: 1190#endif 1191 ip_mc_clear_src(im); 1192} 1193 1194static void igmp_group_added(struct ip_mc_list *im) 1195{ 1196 struct in_device *in_dev = im->interface; 1197 1198 if (im->loaded == 0) { 1199 im->loaded = 1; 1200 ip_mc_filter_add(in_dev, im->multiaddr); 1201 } 1202 1203#ifdef CONFIG_IP_MULTICAST 1204 if (im->multiaddr == IGMP_ALL_HOSTS) 1205 return; 1206 1207 if (in_dev->dead) 1208 return; 1209 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1210 spin_lock_bh(&im->lock); 1211 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1212 spin_unlock_bh(&im->lock); 1213 return; 1214 } 1215 /* else, v3 */ 1216 1217 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1218 IGMP_Unsolicited_Report_Count; 1219 igmp_ifc_event(in_dev); 1220#endif 1221} 1222 1223 1224/* 1225 * Multicast list managers 1226 */ 1227 1228 1229/* 1230 * A socket has joined a multicast group on device dev. 1231 */ 1232 1233void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1234{ 1235 struct ip_mc_list *im; 1236 1237 ASSERT_RTNL(); 1238 1239 for (im=in_dev->mc_list; im; im=im->next) { 1240 if (im->multiaddr == addr) { 1241 im->users++; 1242 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1243 goto out; 1244 } 1245 } 1246 1247 im = kmalloc(sizeof(*im), GFP_KERNEL); 1248 if (!im) 1249 goto out; 1250 1251 im->users = 1; 1252 im->interface = in_dev; 1253 in_dev_hold(in_dev); 1254 im->multiaddr = addr; 1255 /* initial mode is (EX, empty) */ 1256 im->sfmode = MCAST_EXCLUDE; 1257 im->sfcount[MCAST_INCLUDE] = 0; 1258 im->sfcount[MCAST_EXCLUDE] = 1; 1259 im->sources = NULL; 1260 im->tomb = NULL; 1261 im->crcount = 0; 1262 atomic_set(&im->refcnt, 1); 1263 spin_lock_init(&im->lock); 1264#ifdef CONFIG_IP_MULTICAST 1265 im->tm_running = 0; 1266 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1267 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1268 im->reporter = 0; 1269 im->gsquery = 0; 1270#endif 1271 im->loaded = 0; 1272 write_lock_bh(&in_dev->mc_list_lock); 1273 im->next = in_dev->mc_list; 1274 in_dev->mc_list = im; 1275 in_dev->mc_count++; 1276 write_unlock_bh(&in_dev->mc_list_lock); 1277#ifdef CONFIG_IP_MULTICAST 1278 igmpv3_del_delrec(in_dev, im->multiaddr); 1279#endif 1280 igmp_group_added(im); 1281 if (!in_dev->dead) 1282 ip_rt_multicast_event(in_dev); 1283out: 1284 return; 1285} 1286EXPORT_SYMBOL(ip_mc_inc_group); 1287 1288/* 1289 * Resend IGMP JOIN report; used for bonding. 1290 */ 1291void ip_mc_rejoin_group(struct ip_mc_list *im) 1292{ 1293#ifdef CONFIG_IP_MULTICAST 1294 struct in_device *in_dev = im->interface; 1295 1296 if (im->multiaddr == IGMP_ALL_HOSTS) 1297 return; 1298 1299 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1300 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1301 return; 1302 } 1303 /* else, v3 */ 1304 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1305 IGMP_Unsolicited_Report_Count; 1306 igmp_ifc_event(in_dev); 1307#endif 1308} 1309EXPORT_SYMBOL(ip_mc_rejoin_group); 1310 1311/* 1312 * A socket has left a multicast group on device dev 1313 */ 1314 1315void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1316{ 1317 struct ip_mc_list *i, **ip; 1318 1319 ASSERT_RTNL(); 1320 1321 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1322 if (i->multiaddr == addr) { 1323 if (--i->users == 0) { 1324 write_lock_bh(&in_dev->mc_list_lock); 1325 *ip = i->next; 1326 in_dev->mc_count--; 1327 write_unlock_bh(&in_dev->mc_list_lock); 1328 igmp_group_dropped(i); 1329 1330 if (!in_dev->dead) 1331 ip_rt_multicast_event(in_dev); 1332 1333 ip_ma_put(i); 1334 return; 1335 } 1336 break; 1337 } 1338 } 1339} 1340EXPORT_SYMBOL(ip_mc_dec_group); 1341 1342/* Device changing type */ 1343 1344void ip_mc_unmap(struct in_device *in_dev) 1345{ 1346 struct ip_mc_list *i; 1347 1348 ASSERT_RTNL(); 1349 1350 for (i = in_dev->mc_list; i; i = i->next) 1351 igmp_group_dropped(i); 1352} 1353 1354void ip_mc_remap(struct in_device *in_dev) 1355{ 1356 struct ip_mc_list *i; 1357 1358 ASSERT_RTNL(); 1359 1360 for (i = in_dev->mc_list; i; i = i->next) 1361 igmp_group_added(i); 1362} 1363 1364/* Device going down */ 1365 1366void ip_mc_down(struct in_device *in_dev) 1367{ 1368 struct ip_mc_list *i; 1369 1370 ASSERT_RTNL(); 1371 1372 for (i=in_dev->mc_list; i; i=i->next) 1373 igmp_group_dropped(i); 1374 1375#ifdef CONFIG_IP_MULTICAST 1376 in_dev->mr_ifc_count = 0; 1377 if (del_timer(&in_dev->mr_ifc_timer)) 1378 __in_dev_put(in_dev); 1379 in_dev->mr_gq_running = 0; 1380 if (del_timer(&in_dev->mr_gq_timer)) 1381 __in_dev_put(in_dev); 1382 igmpv3_clear_delrec(in_dev); 1383#endif 1384 1385 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1386} 1387 1388void ip_mc_init_dev(struct in_device *in_dev) 1389{ 1390 ASSERT_RTNL(); 1391 1392 in_dev->mc_tomb = NULL; 1393#ifdef CONFIG_IP_MULTICAST 1394 in_dev->mr_gq_running = 0; 1395 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1396 (unsigned long)in_dev); 1397 in_dev->mr_ifc_count = 0; 1398 in_dev->mc_count = 0; 1399 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1400 (unsigned long)in_dev); 1401 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1402#endif 1403 1404 rwlock_init(&in_dev->mc_list_lock); 1405 spin_lock_init(&in_dev->mc_tomb_lock); 1406} 1407 1408/* Device going up */ 1409 1410void ip_mc_up(struct in_device *in_dev) 1411{ 1412 struct ip_mc_list *i; 1413 1414 ASSERT_RTNL(); 1415 1416 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1417 1418 for (i=in_dev->mc_list; i; i=i->next) 1419 igmp_group_added(i); 1420} 1421 1422/* 1423 * Device is about to be destroyed: clean up. 1424 */ 1425 1426void ip_mc_destroy_dev(struct in_device *in_dev) 1427{ 1428 struct ip_mc_list *i; 1429 1430 ASSERT_RTNL(); 1431 1432 /* Deactivate timers */ 1433 ip_mc_down(in_dev); 1434 1435 write_lock_bh(&in_dev->mc_list_lock); 1436 while ((i = in_dev->mc_list) != NULL) { 1437 in_dev->mc_list = i->next; 1438 in_dev->mc_count--; 1439 write_unlock_bh(&in_dev->mc_list_lock); 1440 igmp_group_dropped(i); 1441 ip_ma_put(i); 1442 1443 write_lock_bh(&in_dev->mc_list_lock); 1444 } 1445 write_unlock_bh(&in_dev->mc_list_lock); 1446} 1447 1448static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1449{ 1450 struct flowi fl = { .nl_u = { .ip4_u = 1451 { .daddr = imr->imr_multiaddr.s_addr } } }; 1452 struct rtable *rt; 1453 struct net_device *dev = NULL; 1454 struct in_device *idev = NULL; 1455 1456 if (imr->imr_ifindex) { 1457 idev = inetdev_by_index(net, imr->imr_ifindex); 1458 if (idev) 1459 __in_dev_put(idev); 1460 return idev; 1461 } 1462 if (imr->imr_address.s_addr) { 1463 dev = ip_dev_find(net, imr->imr_address.s_addr); 1464 if (!dev) 1465 return NULL; 1466 dev_put(dev); 1467 } 1468 1469 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1470 dev = rt->dst.dev; 1471 ip_rt_put(rt); 1472 } 1473 if (dev) { 1474 imr->imr_ifindex = dev->ifindex; 1475 idev = __in_dev_get_rtnl(dev); 1476 } 1477 return idev; 1478} 1479 1480/* 1481 * Join a socket to a group 1482 */ 1483int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1484int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1485 1486 1487static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1488 __be32 *psfsrc) 1489{ 1490 struct ip_sf_list *psf, *psf_prev; 1491 int rv = 0; 1492 1493 psf_prev = NULL; 1494 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1495 if (psf->sf_inaddr == *psfsrc) 1496 break; 1497 psf_prev = psf; 1498 } 1499 if (!psf || psf->sf_count[sfmode] == 0) { 1500 /* source filter not found, or count wrong => bug */ 1501 return -ESRCH; 1502 } 1503 psf->sf_count[sfmode]--; 1504 if (psf->sf_count[sfmode] == 0) { 1505 ip_rt_multicast_event(pmc->interface); 1506 } 1507 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1508#ifdef CONFIG_IP_MULTICAST 1509 struct in_device *in_dev = pmc->interface; 1510#endif 1511 1512 /* no more filters for this source */ 1513 if (psf_prev) 1514 psf_prev->sf_next = psf->sf_next; 1515 else 1516 pmc->sources = psf->sf_next; 1517#ifdef CONFIG_IP_MULTICAST 1518 if (psf->sf_oldin && 1519 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1520 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1521 IGMP_Unsolicited_Report_Count; 1522 psf->sf_next = pmc->tomb; 1523 pmc->tomb = psf; 1524 rv = 1; 1525 } else 1526#endif 1527 kfree(psf); 1528 } 1529 return rv; 1530} 1531 1532#ifndef CONFIG_IP_MULTICAST 1533#define igmp_ifc_event(x) do { } while (0) 1534#endif 1535 1536static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1537 int sfcount, __be32 *psfsrc, int delta) 1538{ 1539 struct ip_mc_list *pmc; 1540 int changerec = 0; 1541 int i, err; 1542 1543 if (!in_dev) 1544 return -ENODEV; 1545 read_lock(&in_dev->mc_list_lock); 1546 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1547 if (*pmca == pmc->multiaddr) 1548 break; 1549 } 1550 if (!pmc) { 1551 /* MCA not found?? bug */ 1552 read_unlock(&in_dev->mc_list_lock); 1553 return -ESRCH; 1554 } 1555 spin_lock_bh(&pmc->lock); 1556 read_unlock(&in_dev->mc_list_lock); 1557#ifdef CONFIG_IP_MULTICAST 1558 sf_markstate(pmc); 1559#endif 1560 if (!delta) { 1561 err = -EINVAL; 1562 if (!pmc->sfcount[sfmode]) 1563 goto out_unlock; 1564 pmc->sfcount[sfmode]--; 1565 } 1566 err = 0; 1567 for (i=0; i<sfcount; i++) { 1568 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1569 1570 changerec |= rv > 0; 1571 if (!err && rv < 0) 1572 err = rv; 1573 } 1574 if (pmc->sfmode == MCAST_EXCLUDE && 1575 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1576 pmc->sfcount[MCAST_INCLUDE]) { 1577#ifdef CONFIG_IP_MULTICAST 1578 struct ip_sf_list *psf; 1579#endif 1580 1581 /* filter mode change */ 1582 pmc->sfmode = MCAST_INCLUDE; 1583#ifdef CONFIG_IP_MULTICAST 1584 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1585 IGMP_Unsolicited_Report_Count; 1586 in_dev->mr_ifc_count = pmc->crcount; 1587 for (psf=pmc->sources; psf; psf = psf->sf_next) 1588 psf->sf_crcount = 0; 1589 igmp_ifc_event(pmc->interface); 1590 } else if (sf_setstate(pmc) || changerec) { 1591 igmp_ifc_event(pmc->interface); 1592#endif 1593 } 1594out_unlock: 1595 spin_unlock_bh(&pmc->lock); 1596 return err; 1597} 1598 1599/* 1600 * Add multicast single-source filter to the interface list 1601 */ 1602static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1603 __be32 *psfsrc, int delta) 1604{ 1605 struct ip_sf_list *psf, *psf_prev; 1606 1607 psf_prev = NULL; 1608 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1609 if (psf->sf_inaddr == *psfsrc) 1610 break; 1611 psf_prev = psf; 1612 } 1613 if (!psf) { 1614 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1615 if (!psf) 1616 return -ENOBUFS; 1617 psf->sf_inaddr = *psfsrc; 1618 if (psf_prev) { 1619 psf_prev->sf_next = psf; 1620 } else 1621 pmc->sources = psf; 1622 } 1623 psf->sf_count[sfmode]++; 1624 if (psf->sf_count[sfmode] == 1) { 1625 ip_rt_multicast_event(pmc->interface); 1626 } 1627 return 0; 1628} 1629 1630#ifdef CONFIG_IP_MULTICAST 1631static void sf_markstate(struct ip_mc_list *pmc) 1632{ 1633 struct ip_sf_list *psf; 1634 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1635 1636 for (psf=pmc->sources; psf; psf=psf->sf_next) 1637 if (pmc->sfcount[MCAST_EXCLUDE]) { 1638 psf->sf_oldin = mca_xcount == 1639 psf->sf_count[MCAST_EXCLUDE] && 1640 !psf->sf_count[MCAST_INCLUDE]; 1641 } else 1642 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1643} 1644 1645static int sf_setstate(struct ip_mc_list *pmc) 1646{ 1647 struct ip_sf_list *psf, *dpsf; 1648 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1649 int qrv = pmc->interface->mr_qrv; 1650 int new_in, rv; 1651 1652 rv = 0; 1653 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1654 if (pmc->sfcount[MCAST_EXCLUDE]) { 1655 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1656 !psf->sf_count[MCAST_INCLUDE]; 1657 } else 1658 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1659 if (new_in) { 1660 if (!psf->sf_oldin) { 1661 struct ip_sf_list *prev = NULL; 1662 1663 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1664 if (dpsf->sf_inaddr == psf->sf_inaddr) 1665 break; 1666 prev = dpsf; 1667 } 1668 if (dpsf) { 1669 if (prev) 1670 prev->sf_next = dpsf->sf_next; 1671 else 1672 pmc->tomb = dpsf->sf_next; 1673 kfree(dpsf); 1674 } 1675 psf->sf_crcount = qrv; 1676 rv++; 1677 } 1678 } else if (psf->sf_oldin) { 1679 1680 psf->sf_crcount = 0; 1681 /* 1682 * add or update "delete" records if an active filter 1683 * is now inactive 1684 */ 1685 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1686 if (dpsf->sf_inaddr == psf->sf_inaddr) 1687 break; 1688 if (!dpsf) { 1689 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1690 if (!dpsf) 1691 continue; 1692 *dpsf = *psf; 1693 /* pmc->lock held by callers */ 1694 dpsf->sf_next = pmc->tomb; 1695 pmc->tomb = dpsf; 1696 } 1697 dpsf->sf_crcount = qrv; 1698 rv++; 1699 } 1700 } 1701 return rv; 1702} 1703#endif 1704 1705/* 1706 * Add multicast source filter list to the interface list 1707 */ 1708static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1709 int sfcount, __be32 *psfsrc, int delta) 1710{ 1711 struct ip_mc_list *pmc; 1712 int isexclude; 1713 int i, err; 1714 1715 if (!in_dev) 1716 return -ENODEV; 1717 read_lock(&in_dev->mc_list_lock); 1718 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1719 if (*pmca == pmc->multiaddr) 1720 break; 1721 } 1722 if (!pmc) { 1723 /* MCA not found?? bug */ 1724 read_unlock(&in_dev->mc_list_lock); 1725 return -ESRCH; 1726 } 1727 spin_lock_bh(&pmc->lock); 1728 read_unlock(&in_dev->mc_list_lock); 1729 1730#ifdef CONFIG_IP_MULTICAST 1731 sf_markstate(pmc); 1732#endif 1733 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1734 if (!delta) 1735 pmc->sfcount[sfmode]++; 1736 err = 0; 1737 for (i=0; i<sfcount; i++) { 1738 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1739 if (err) 1740 break; 1741 } 1742 if (err) { 1743 int j; 1744 1745 pmc->sfcount[sfmode]--; 1746 for (j=0; j<i; j++) 1747 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1748 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1749#ifdef CONFIG_IP_MULTICAST 1750 struct ip_sf_list *psf; 1751 in_dev = pmc->interface; 1752#endif 1753 1754 /* filter mode change */ 1755 if (pmc->sfcount[MCAST_EXCLUDE]) 1756 pmc->sfmode = MCAST_EXCLUDE; 1757 else if (pmc->sfcount[MCAST_INCLUDE]) 1758 pmc->sfmode = MCAST_INCLUDE; 1759#ifdef CONFIG_IP_MULTICAST 1760 /* else no filters; keep old mode for reports */ 1761 1762 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1763 IGMP_Unsolicited_Report_Count; 1764 in_dev->mr_ifc_count = pmc->crcount; 1765 for (psf=pmc->sources; psf; psf = psf->sf_next) 1766 psf->sf_crcount = 0; 1767 igmp_ifc_event(in_dev); 1768 } else if (sf_setstate(pmc)) { 1769 igmp_ifc_event(in_dev); 1770#endif 1771 } 1772 spin_unlock_bh(&pmc->lock); 1773 return err; 1774} 1775 1776static void ip_mc_clear_src(struct ip_mc_list *pmc) 1777{ 1778 struct ip_sf_list *psf, *nextpsf; 1779 1780 for (psf=pmc->tomb; psf; psf=nextpsf) { 1781 nextpsf = psf->sf_next; 1782 kfree(psf); 1783 } 1784 pmc->tomb = NULL; 1785 for (psf=pmc->sources; psf; psf=nextpsf) { 1786 nextpsf = psf->sf_next; 1787 kfree(psf); 1788 } 1789 pmc->sources = NULL; 1790 pmc->sfmode = MCAST_EXCLUDE; 1791 pmc->sfcount[MCAST_INCLUDE] = 0; 1792 pmc->sfcount[MCAST_EXCLUDE] = 1; 1793} 1794 1795 1796/* 1797 * Join a multicast group 1798 */ 1799int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1800{ 1801 int err; 1802 __be32 addr = imr->imr_multiaddr.s_addr; 1803 struct ip_mc_socklist *iml = NULL, *i; 1804 struct in_device *in_dev; 1805 struct inet_sock *inet = inet_sk(sk); 1806 struct net *net = sock_net(sk); 1807 int ifindex; 1808 int count = 0; 1809 1810 if (!ipv4_is_multicast(addr)) 1811 return -EINVAL; 1812 1813 rtnl_lock(); 1814 1815 in_dev = ip_mc_find_dev(net, imr); 1816 1817 if (!in_dev) { 1818 iml = NULL; 1819 err = -ENODEV; 1820 goto done; 1821 } 1822 1823 err = -EADDRINUSE; 1824 ifindex = imr->imr_ifindex; 1825 for (i = inet->mc_list; i; i = i->next) { 1826 if (i->multi.imr_multiaddr.s_addr == addr && 1827 i->multi.imr_ifindex == ifindex) 1828 goto done; 1829 count++; 1830 } 1831 err = -ENOBUFS; 1832 if (count >= sysctl_igmp_max_memberships) 1833 goto done; 1834 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1835 if (iml == NULL) 1836 goto done; 1837 1838 memcpy(&iml->multi, imr, sizeof(*imr)); 1839 iml->next = inet->mc_list; 1840 iml->sflist = NULL; 1841 iml->sfmode = MCAST_EXCLUDE; 1842 rcu_assign_pointer(inet->mc_list, iml); 1843 ip_mc_inc_group(in_dev, addr); 1844 err = 0; 1845done: 1846 rtnl_unlock(); 1847 return err; 1848} 1849EXPORT_SYMBOL(ip_mc_join_group); 1850 1851static void ip_sf_socklist_reclaim(struct rcu_head *rp) 1852{ 1853 struct ip_sf_socklist *psf; 1854 1855 psf = container_of(rp, struct ip_sf_socklist, rcu); 1856 /* sk_omem_alloc should have been decreased by the caller*/ 1857 kfree(psf); 1858} 1859 1860static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1861 struct in_device *in_dev) 1862{ 1863 struct ip_sf_socklist *psf = iml->sflist; 1864 int err; 1865 1866 if (psf == NULL) { 1867 /* any-source empty exclude case */ 1868 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1869 iml->sfmode, 0, NULL, 0); 1870 } 1871 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1872 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1873 rcu_assign_pointer(iml->sflist, NULL); 1874 /* decrease mem now to avoid the memleak warning */ 1875 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1876 call_rcu(&psf->rcu, ip_sf_socklist_reclaim); 1877 return err; 1878} 1879 1880 1881static void ip_mc_socklist_reclaim(struct rcu_head *rp) 1882{ 1883 struct ip_mc_socklist *iml; 1884 1885 iml = container_of(rp, struct ip_mc_socklist, rcu); 1886 /* sk_omem_alloc should have been decreased by the caller*/ 1887 kfree(iml); 1888} 1889 1890 1891/* 1892 * Ask a socket to leave a group. 1893 */ 1894 1895int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1896{ 1897 struct inet_sock *inet = inet_sk(sk); 1898 struct ip_mc_socklist *iml, **imlp; 1899 struct in_device *in_dev; 1900 struct net *net = sock_net(sk); 1901 __be32 group = imr->imr_multiaddr.s_addr; 1902 u32 ifindex; 1903 int ret = -EADDRNOTAVAIL; 1904 1905 rtnl_lock(); 1906 in_dev = ip_mc_find_dev(net, imr); 1907 ifindex = imr->imr_ifindex; 1908 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1909 if (iml->multi.imr_multiaddr.s_addr != group) 1910 continue; 1911 if (ifindex) { 1912 if (iml->multi.imr_ifindex != ifindex) 1913 continue; 1914 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1915 iml->multi.imr_address.s_addr) 1916 continue; 1917 1918 (void) ip_mc_leave_src(sk, iml, in_dev); 1919 1920 rcu_assign_pointer(*imlp, iml->next); 1921 1922 if (in_dev) 1923 ip_mc_dec_group(in_dev, group); 1924 rtnl_unlock(); 1925 /* decrease mem now to avoid the memleak warning */ 1926 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1927 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 1928 return 0; 1929 } 1930 if (!in_dev) 1931 ret = -ENODEV; 1932 rtnl_unlock(); 1933 return ret; 1934} 1935 1936int ip_mc_source(int add, int omode, struct sock *sk, struct 1937 ip_mreq_source *mreqs, int ifindex) 1938{ 1939 int err; 1940 struct ip_mreqn imr; 1941 __be32 addr = mreqs->imr_multiaddr; 1942 struct ip_mc_socklist *pmc; 1943 struct in_device *in_dev = NULL; 1944 struct inet_sock *inet = inet_sk(sk); 1945 struct ip_sf_socklist *psl; 1946 struct net *net = sock_net(sk); 1947 int leavegroup = 0; 1948 int i, j, rv; 1949 1950 if (!ipv4_is_multicast(addr)) 1951 return -EINVAL; 1952 1953 rtnl_lock(); 1954 1955 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1956 imr.imr_address.s_addr = mreqs->imr_interface; 1957 imr.imr_ifindex = ifindex; 1958 in_dev = ip_mc_find_dev(net, &imr); 1959 1960 if (!in_dev) { 1961 err = -ENODEV; 1962 goto done; 1963 } 1964 err = -EADDRNOTAVAIL; 1965 1966 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1967 if ((pmc->multi.imr_multiaddr.s_addr == 1968 imr.imr_multiaddr.s_addr) && 1969 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1970 break; 1971 } 1972 if (!pmc) { /* must have a prior join */ 1973 err = -EINVAL; 1974 goto done; 1975 } 1976 /* if a source filter was set, must be the same mode as before */ 1977 if (pmc->sflist) { 1978 if (pmc->sfmode != omode) { 1979 err = -EINVAL; 1980 goto done; 1981 } 1982 } else if (pmc->sfmode != omode) { 1983 /* allow mode switches for empty-set filters */ 1984 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1985 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1986 NULL, 0); 1987 pmc->sfmode = omode; 1988 } 1989 1990 psl = pmc->sflist; 1991 if (!add) { 1992 if (!psl) 1993 goto done; /* err = -EADDRNOTAVAIL */ 1994 rv = !0; 1995 for (i=0; i<psl->sl_count; i++) { 1996 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1997 sizeof(__be32)); 1998 if (rv == 0) 1999 break; 2000 } 2001 if (rv) /* source not found */ 2002 goto done; /* err = -EADDRNOTAVAIL */ 2003 2004 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2005 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2006 leavegroup = 1; 2007 goto done; 2008 } 2009 2010 /* update the interface filter */ 2011 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2012 &mreqs->imr_sourceaddr, 1); 2013 2014 for (j=i+1; j<psl->sl_count; j++) 2015 psl->sl_addr[j-1] = psl->sl_addr[j]; 2016 psl->sl_count--; 2017 err = 0; 2018 goto done; 2019 } 2020 /* else, add a new source to the filter */ 2021 2022 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 2023 err = -ENOBUFS; 2024 goto done; 2025 } 2026 if (!psl || psl->sl_count == psl->sl_max) { 2027 struct ip_sf_socklist *newpsl; 2028 int count = IP_SFBLOCK; 2029 2030 if (psl) 2031 count += psl->sl_max; 2032 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2033 if (!newpsl) { 2034 err = -ENOBUFS; 2035 goto done; 2036 } 2037 newpsl->sl_max = count; 2038 newpsl->sl_count = count - IP_SFBLOCK; 2039 if (psl) { 2040 for (i=0; i<psl->sl_count; i++) 2041 newpsl->sl_addr[i] = psl->sl_addr[i]; 2042 /* decrease mem now to avoid the memleak warning */ 2043 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2044 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2045 } 2046 rcu_assign_pointer(pmc->sflist, newpsl); 2047 psl = newpsl; 2048 } 2049 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2050 for (i=0; i<psl->sl_count; i++) { 2051 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2052 sizeof(__be32)); 2053 if (rv == 0) 2054 break; 2055 } 2056 if (rv == 0) /* address already there is an error */ 2057 goto done; 2058 for (j=psl->sl_count-1; j>=i; j--) 2059 psl->sl_addr[j+1] = psl->sl_addr[j]; 2060 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2061 psl->sl_count++; 2062 err = 0; 2063 /* update the interface list */ 2064 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2065 &mreqs->imr_sourceaddr, 1); 2066done: 2067 rtnl_unlock(); 2068 if (leavegroup) 2069 return ip_mc_leave_group(sk, &imr); 2070 return err; 2071} 2072 2073int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2074{ 2075 int err = 0; 2076 struct ip_mreqn imr; 2077 __be32 addr = msf->imsf_multiaddr; 2078 struct ip_mc_socklist *pmc; 2079 struct in_device *in_dev; 2080 struct inet_sock *inet = inet_sk(sk); 2081 struct ip_sf_socklist *newpsl, *psl; 2082 struct net *net = sock_net(sk); 2083 int leavegroup = 0; 2084 2085 if (!ipv4_is_multicast(addr)) 2086 return -EINVAL; 2087 if (msf->imsf_fmode != MCAST_INCLUDE && 2088 msf->imsf_fmode != MCAST_EXCLUDE) 2089 return -EINVAL; 2090 2091 rtnl_lock(); 2092 2093 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2094 imr.imr_address.s_addr = msf->imsf_interface; 2095 imr.imr_ifindex = ifindex; 2096 in_dev = ip_mc_find_dev(net, &imr); 2097 2098 if (!in_dev) { 2099 err = -ENODEV; 2100 goto done; 2101 } 2102 2103 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2104 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2105 leavegroup = 1; 2106 goto done; 2107 } 2108 2109 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2110 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2111 pmc->multi.imr_ifindex == imr.imr_ifindex) 2112 break; 2113 } 2114 if (!pmc) { /* must have a prior join */ 2115 err = -EINVAL; 2116 goto done; 2117 } 2118 if (msf->imsf_numsrc) { 2119 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2120 GFP_KERNEL); 2121 if (!newpsl) { 2122 err = -ENOBUFS; 2123 goto done; 2124 } 2125 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2126 memcpy(newpsl->sl_addr, msf->imsf_slist, 2127 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2128 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2129 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2130 if (err) { 2131 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2132 goto done; 2133 } 2134 } else { 2135 newpsl = NULL; 2136 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2137 msf->imsf_fmode, 0, NULL, 0); 2138 } 2139 psl = pmc->sflist; 2140 if (psl) { 2141 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2142 psl->sl_count, psl->sl_addr, 0); 2143 /* decrease mem now to avoid the memleak warning */ 2144 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2145 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2146 } else 2147 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2148 0, NULL, 0); 2149 rcu_assign_pointer(pmc->sflist, newpsl); 2150 pmc->sfmode = msf->imsf_fmode; 2151 err = 0; 2152done: 2153 rtnl_unlock(); 2154 if (leavegroup) 2155 err = ip_mc_leave_group(sk, &imr); 2156 return err; 2157} 2158 2159int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2160 struct ip_msfilter __user *optval, int __user *optlen) 2161{ 2162 int err, len, count, copycount; 2163 struct ip_mreqn imr; 2164 __be32 addr = msf->imsf_multiaddr; 2165 struct ip_mc_socklist *pmc; 2166 struct in_device *in_dev; 2167 struct inet_sock *inet = inet_sk(sk); 2168 struct ip_sf_socklist *psl; 2169 struct net *net = sock_net(sk); 2170 2171 if (!ipv4_is_multicast(addr)) 2172 return -EINVAL; 2173 2174 rtnl_lock(); 2175 2176 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2177 imr.imr_address.s_addr = msf->imsf_interface; 2178 imr.imr_ifindex = 0; 2179 in_dev = ip_mc_find_dev(net, &imr); 2180 2181 if (!in_dev) { 2182 err = -ENODEV; 2183 goto done; 2184 } 2185 err = -EADDRNOTAVAIL; 2186 2187 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2188 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2189 pmc->multi.imr_ifindex == imr.imr_ifindex) 2190 break; 2191 } 2192 if (!pmc) /* must have a prior join */ 2193 goto done; 2194 msf->imsf_fmode = pmc->sfmode; 2195 psl = pmc->sflist; 2196 rtnl_unlock(); 2197 if (!psl) { 2198 len = 0; 2199 count = 0; 2200 } else { 2201 count = psl->sl_count; 2202 } 2203 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2204 len = copycount * sizeof(psl->sl_addr[0]); 2205 msf->imsf_numsrc = count; 2206 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2207 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2208 return -EFAULT; 2209 } 2210 if (len && 2211 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2212 return -EFAULT; 2213 return 0; 2214done: 2215 rtnl_unlock(); 2216 return err; 2217} 2218 2219int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2220 struct group_filter __user *optval, int __user *optlen) 2221{ 2222 int err, i, count, copycount; 2223 struct sockaddr_in *psin; 2224 __be32 addr; 2225 struct ip_mc_socklist *pmc; 2226 struct inet_sock *inet = inet_sk(sk); 2227 struct ip_sf_socklist *psl; 2228 2229 psin = (struct sockaddr_in *)&gsf->gf_group; 2230 if (psin->sin_family != AF_INET) 2231 return -EINVAL; 2232 addr = psin->sin_addr.s_addr; 2233 if (!ipv4_is_multicast(addr)) 2234 return -EINVAL; 2235 2236 rtnl_lock(); 2237 2238 err = -EADDRNOTAVAIL; 2239 2240 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2241 if (pmc->multi.imr_multiaddr.s_addr == addr && 2242 pmc->multi.imr_ifindex == gsf->gf_interface) 2243 break; 2244 } 2245 if (!pmc) /* must have a prior join */ 2246 goto done; 2247 gsf->gf_fmode = pmc->sfmode; 2248 psl = pmc->sflist; 2249 rtnl_unlock(); 2250 count = psl ? psl->sl_count : 0; 2251 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2252 gsf->gf_numsrc = count; 2253 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2254 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2255 return -EFAULT; 2256 } 2257 for (i=0; i<copycount; i++) { 2258 struct sockaddr_storage ss; 2259 2260 psin = (struct sockaddr_in *)&ss; 2261 memset(&ss, 0, sizeof(ss)); 2262 psin->sin_family = AF_INET; 2263 psin->sin_addr.s_addr = psl->sl_addr[i]; 2264 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2265 return -EFAULT; 2266 } 2267 return 0; 2268done: 2269 rtnl_unlock(); 2270 return err; 2271} 2272 2273/* 2274 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2275 */ 2276int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2277{ 2278 struct inet_sock *inet = inet_sk(sk); 2279 struct ip_mc_socklist *pmc; 2280 struct ip_sf_socklist *psl; 2281 int i; 2282 int ret; 2283 2284 ret = 1; 2285 if (!ipv4_is_multicast(loc_addr)) 2286 goto out; 2287 2288 rcu_read_lock(); 2289 for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) { 2290 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2291 pmc->multi.imr_ifindex == dif) 2292 break; 2293 } 2294 ret = inet->mc_all; 2295 if (!pmc) 2296 goto unlock; 2297 psl = pmc->sflist; 2298 ret = (pmc->sfmode == MCAST_EXCLUDE); 2299 if (!psl) 2300 goto unlock; 2301 2302 for (i=0; i<psl->sl_count; i++) { 2303 if (psl->sl_addr[i] == rmt_addr) 2304 break; 2305 } 2306 ret = 0; 2307 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2308 goto unlock; 2309 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2310 goto unlock; 2311 ret = 1; 2312unlock: 2313 rcu_read_unlock(); 2314out: 2315 return ret; 2316} 2317 2318/* 2319 * A socket is closing. 2320 */ 2321 2322void ip_mc_drop_socket(struct sock *sk) 2323{ 2324 struct inet_sock *inet = inet_sk(sk); 2325 struct ip_mc_socklist *iml; 2326 struct net *net = sock_net(sk); 2327 2328 if (inet->mc_list == NULL) 2329 return; 2330 2331 rtnl_lock(); 2332 while ((iml = inet->mc_list) != NULL) { 2333 struct in_device *in_dev; 2334 rcu_assign_pointer(inet->mc_list, iml->next); 2335 2336 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2337 (void) ip_mc_leave_src(sk, iml, in_dev); 2338 if (in_dev != NULL) { 2339 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2340 in_dev_put(in_dev); 2341 } 2342 /* decrease mem now to avoid the memleak warning */ 2343 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2344 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 2345 } 2346 rtnl_unlock(); 2347} 2348 2349int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2350{ 2351 struct ip_mc_list *im; 2352 struct ip_sf_list *psf; 2353 int rv = 0; 2354 2355 read_lock(&in_dev->mc_list_lock); 2356 for (im=in_dev->mc_list; im; im=im->next) { 2357 if (im->multiaddr == mc_addr) 2358 break; 2359 } 2360 if (im && proto == IPPROTO_IGMP) { 2361 rv = 1; 2362 } else if (im) { 2363 if (src_addr) { 2364 for (psf=im->sources; psf; psf=psf->sf_next) { 2365 if (psf->sf_inaddr == src_addr) 2366 break; 2367 } 2368 if (psf) 2369 rv = psf->sf_count[MCAST_INCLUDE] || 2370 psf->sf_count[MCAST_EXCLUDE] != 2371 im->sfcount[MCAST_EXCLUDE]; 2372 else 2373 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2374 } else 2375 rv = 1; /* unspecified source; tentatively allow */ 2376 } 2377 read_unlock(&in_dev->mc_list_lock); 2378 return rv; 2379} 2380 2381#if defined(CONFIG_PROC_FS) 2382struct igmp_mc_iter_state { 2383 struct seq_net_private p; 2384 struct net_device *dev; 2385 struct in_device *in_dev; 2386}; 2387 2388#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2389 2390static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2391{ 2392 struct net *net = seq_file_net(seq); 2393 struct ip_mc_list *im = NULL; 2394 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2395 2396 state->in_dev = NULL; 2397 for_each_netdev_rcu(net, state->dev) { 2398 struct in_device *in_dev; 2399 2400 in_dev = __in_dev_get_rcu(state->dev); 2401 if (!in_dev) 2402 continue; 2403 read_lock(&in_dev->mc_list_lock); 2404 im = in_dev->mc_list; 2405 if (im) { 2406 state->in_dev = in_dev; 2407 break; 2408 } 2409 read_unlock(&in_dev->mc_list_lock); 2410 } 2411 return im; 2412} 2413 2414static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2415{ 2416 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2417 im = im->next; 2418 while (!im) { 2419 if (likely(state->in_dev != NULL)) 2420 read_unlock(&state->in_dev->mc_list_lock); 2421 2422 state->dev = next_net_device_rcu(state->dev); 2423 if (!state->dev) { 2424 state->in_dev = NULL; 2425 break; 2426 } 2427 state->in_dev = __in_dev_get_rcu(state->dev); 2428 if (!state->in_dev) 2429 continue; 2430 read_lock(&state->in_dev->mc_list_lock); 2431 im = state->in_dev->mc_list; 2432 } 2433 return im; 2434} 2435 2436static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2437{ 2438 struct ip_mc_list *im = igmp_mc_get_first(seq); 2439 if (im) 2440 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2441 --pos; 2442 return pos ? NULL : im; 2443} 2444 2445static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2446 __acquires(rcu) 2447{ 2448 rcu_read_lock(); 2449 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2450} 2451 2452static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2453{ 2454 struct ip_mc_list *im; 2455 if (v == SEQ_START_TOKEN) 2456 im = igmp_mc_get_first(seq); 2457 else 2458 im = igmp_mc_get_next(seq, v); 2459 ++*pos; 2460 return im; 2461} 2462 2463static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2464 __releases(rcu) 2465{ 2466 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2467 if (likely(state->in_dev != NULL)) { 2468 read_unlock(&state->in_dev->mc_list_lock); 2469 state->in_dev = NULL; 2470 } 2471 state->dev = NULL; 2472 rcu_read_unlock(); 2473} 2474 2475static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2476{ 2477 if (v == SEQ_START_TOKEN) 2478 seq_puts(seq, 2479 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2480 else { 2481 struct ip_mc_list *im = (struct ip_mc_list *)v; 2482 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2483 char *querier; 2484#ifdef CONFIG_IP_MULTICAST 2485 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2486 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2487 "V3"; 2488#else 2489 querier = "NONE"; 2490#endif 2491 2492 if (state->in_dev->mc_list == im) { 2493 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2494 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2495 } 2496 2497 seq_printf(seq, 2498 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2499 im->multiaddr, im->users, 2500 im->tm_running, im->tm_running ? 2501 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2502 im->reporter); 2503 } 2504 return 0; 2505} 2506 2507static const struct seq_operations igmp_mc_seq_ops = { 2508 .start = igmp_mc_seq_start, 2509 .next = igmp_mc_seq_next, 2510 .stop = igmp_mc_seq_stop, 2511 .show = igmp_mc_seq_show, 2512}; 2513 2514static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2515{ 2516 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2517 sizeof(struct igmp_mc_iter_state)); 2518} 2519 2520static const struct file_operations igmp_mc_seq_fops = { 2521 .owner = THIS_MODULE, 2522 .open = igmp_mc_seq_open, 2523 .read = seq_read, 2524 .llseek = seq_lseek, 2525 .release = seq_release_net, 2526}; 2527 2528struct igmp_mcf_iter_state { 2529 struct seq_net_private p; 2530 struct net_device *dev; 2531 struct in_device *idev; 2532 struct ip_mc_list *im; 2533}; 2534 2535#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2536 2537static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2538{ 2539 struct net *net = seq_file_net(seq); 2540 struct ip_sf_list *psf = NULL; 2541 struct ip_mc_list *im = NULL; 2542 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2543 2544 state->idev = NULL; 2545 state->im = NULL; 2546 for_each_netdev_rcu(net, state->dev) { 2547 struct in_device *idev; 2548 idev = __in_dev_get_rcu(state->dev); 2549 if (unlikely(idev == NULL)) 2550 continue; 2551 read_lock(&idev->mc_list_lock); 2552 im = idev->mc_list; 2553 if (likely(im != NULL)) { 2554 spin_lock_bh(&im->lock); 2555 psf = im->sources; 2556 if (likely(psf != NULL)) { 2557 state->im = im; 2558 state->idev = idev; 2559 break; 2560 } 2561 spin_unlock_bh(&im->lock); 2562 } 2563 read_unlock(&idev->mc_list_lock); 2564 } 2565 return psf; 2566} 2567 2568static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2569{ 2570 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2571 2572 psf = psf->sf_next; 2573 while (!psf) { 2574 spin_unlock_bh(&state->im->lock); 2575 state->im = state->im->next; 2576 while (!state->im) { 2577 if (likely(state->idev != NULL)) 2578 read_unlock(&state->idev->mc_list_lock); 2579 2580 state->dev = next_net_device_rcu(state->dev); 2581 if (!state->dev) { 2582 state->idev = NULL; 2583 goto out; 2584 } 2585 state->idev = __in_dev_get_rcu(state->dev); 2586 if (!state->idev) 2587 continue; 2588 read_lock(&state->idev->mc_list_lock); 2589 state->im = state->idev->mc_list; 2590 } 2591 if (!state->im) 2592 break; 2593 spin_lock_bh(&state->im->lock); 2594 psf = state->im->sources; 2595 } 2596out: 2597 return psf; 2598} 2599 2600static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2601{ 2602 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2603 if (psf) 2604 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2605 --pos; 2606 return pos ? NULL : psf; 2607} 2608 2609static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2610 __acquires(rcu) 2611{ 2612 rcu_read_lock(); 2613 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2614} 2615 2616static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2617{ 2618 struct ip_sf_list *psf; 2619 if (v == SEQ_START_TOKEN) 2620 psf = igmp_mcf_get_first(seq); 2621 else 2622 psf = igmp_mcf_get_next(seq, v); 2623 ++*pos; 2624 return psf; 2625} 2626 2627static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2628 __releases(rcu) 2629{ 2630 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2631 if (likely(state->im != NULL)) { 2632 spin_unlock_bh(&state->im->lock); 2633 state->im = NULL; 2634 } 2635 if (likely(state->idev != NULL)) { 2636 read_unlock(&state->idev->mc_list_lock); 2637 state->idev = NULL; 2638 } 2639 state->dev = NULL; 2640 rcu_read_unlock(); 2641} 2642 2643static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2644{ 2645 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2646 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2647 2648 if (v == SEQ_START_TOKEN) { 2649 seq_printf(seq, 2650 "%3s %6s " 2651 "%10s %10s %6s %6s\n", "Idx", 2652 "Device", "MCA", 2653 "SRC", "INC", "EXC"); 2654 } else { 2655 seq_printf(seq, 2656 "%3d %6.6s 0x%08x " 2657 "0x%08x %6lu %6lu\n", 2658 state->dev->ifindex, state->dev->name, 2659 ntohl(state->im->multiaddr), 2660 ntohl(psf->sf_inaddr), 2661 psf->sf_count[MCAST_INCLUDE], 2662 psf->sf_count[MCAST_EXCLUDE]); 2663 } 2664 return 0; 2665} 2666 2667static const struct seq_operations igmp_mcf_seq_ops = { 2668 .start = igmp_mcf_seq_start, 2669 .next = igmp_mcf_seq_next, 2670 .stop = igmp_mcf_seq_stop, 2671 .show = igmp_mcf_seq_show, 2672}; 2673 2674static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2675{ 2676 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2677 sizeof(struct igmp_mcf_iter_state)); 2678} 2679 2680static const struct file_operations igmp_mcf_seq_fops = { 2681 .owner = THIS_MODULE, 2682 .open = igmp_mcf_seq_open, 2683 .read = seq_read, 2684 .llseek = seq_lseek, 2685 .release = seq_release_net, 2686}; 2687 2688static int __net_init igmp_net_init(struct net *net) 2689{ 2690 struct proc_dir_entry *pde; 2691 2692 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2693 if (!pde) 2694 goto out_igmp; 2695 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2696 if (!pde) 2697 goto out_mcfilter; 2698 return 0; 2699 2700out_mcfilter: 2701 proc_net_remove(net, "igmp"); 2702out_igmp: 2703 return -ENOMEM; 2704} 2705 2706static void __net_exit igmp_net_exit(struct net *net) 2707{ 2708 proc_net_remove(net, "mcfilter"); 2709 proc_net_remove(net, "igmp"); 2710} 2711 2712static struct pernet_operations igmp_net_ops = { 2713 .init = igmp_net_init, 2714 .exit = igmp_net_exit, 2715}; 2716 2717int __init igmp_mc_proc_init(void) 2718{ 2719 return register_pernet_subsys(&igmp_net_ops); 2720} 2721#endif 2722