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 <asm/uaccess.h> 75 #include <asm/system.h> 76 #include <linux/types.h> 77 #include <linux/kernel.h> 78 #include <linux/jiffies.h> 79 #include <linux/string.h> 80 #include <linux/socket.h> 81 #include <linux/sockios.h> 82 #include <linux/in.h> 83 #include <linux/inet.h> 84 #include <linux/netdevice.h> 85 #include <linux/skbuff.h> 86 #include <linux/inetdevice.h> 87 #include <linux/igmp.h> 88 #include <linux/if_arp.h> 89 #include <linux/rtnetlink.h> 90 #include <linux/times.h> 91 92 #include <net/net_namespace.h> 93 #include <net/arp.h> 94 #include <net/ip.h> 95 #include <net/protocol.h> 96 #include <net/route.h> 97 #include <net/sock.h> 98 #include <net/checksum.h> 99 #include <linux/netfilter_ipv4.h> 100 #ifdef CONFIG_IP_MROUTE 101 #include <linux/mroute.h> 102 #endif 103 #ifdef CONFIG_PROC_FS 104 #include <linux/proc_fs.h> 105 #include <linux/seq_file.h> 106 #endif 107 108 #define IP_MAX_MEMBERSHIPS 20 109 #define IP_MAX_MSF 10 110 111 #ifdef CONFIG_IP_MULTICAST 112 /* Parameter names and values are taken from igmp-v2-06 draft */ 113 114 #define IGMP_V1_Router_Present_Timeout (400*HZ) 115 #define IGMP_V2_Router_Present_Timeout (400*HZ) 116 #define IGMP_Unsolicited_Report_Interval (10*HZ) 117 #define IGMP_Query_Response_Interval (10*HZ) 118 #define IGMP_Unsolicited_Report_Count 2 119 120 121 #define IGMP_Initial_Report_Delay (1) 122 123 /* IGMP_Initial_Report_Delay is not from IGMP specs! 124 * IGMP specs require to report membership immediately after 125 * joining a group, but we delay the first report by a 126 * small interval. It seems more natural and still does not 127 * contradict to specs provided this delay is small enough. 128 */ 129 130 #define IGMP_V1_SEEN(in_dev) \ 131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 133 ((in_dev)->mr_v1_seen && \ 134 time_before(jiffies, (in_dev)->mr_v1_seen))) 135 #define IGMP_V2_SEEN(in_dev) \ 136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 138 ((in_dev)->mr_v2_seen && \ 139 time_before(jiffies, (in_dev)->mr_v2_seen))) 140 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 143 static void igmpv3_clear_delrec(struct in_device *in_dev); 144 static int sf_setstate(struct ip_mc_list *pmc); 145 static void sf_markstate(struct ip_mc_list *pmc); 146 #endif 147 static void ip_mc_clear_src(struct ip_mc_list *pmc); 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 149 int sfcount, __be32 *psfsrc, int delta); 150 151 static void ip_ma_put(struct ip_mc_list *im) 152 { 153 if (atomic_dec_and_test(&im->refcnt)) { 154 in_dev_put(im->interface); 155 kfree(im); 156 } 157 } 158 159 #ifdef CONFIG_IP_MULTICAST 160 161 /* 162 * Timer management 163 */ 164 165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 166 { 167 spin_lock_bh(&im->lock); 168 if (del_timer(&im->timer)) 169 atomic_dec(&im->refcnt); 170 im->tm_running = 0; 171 im->reporter = 0; 172 im->unsolicit_count = 0; 173 spin_unlock_bh(&im->lock); 174 } 175 176 /* It must be called with locked im->lock */ 177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 178 { 179 int tv = net_random() % max_delay; 180 181 im->tm_running = 1; 182 if (!mod_timer(&im->timer, jiffies+tv+2)) 183 atomic_inc(&im->refcnt); 184 } 185 186 static void igmp_gq_start_timer(struct in_device *in_dev) 187 { 188 int tv = net_random() % in_dev->mr_maxdelay; 189 190 in_dev->mr_gq_running = 1; 191 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 192 in_dev_hold(in_dev); 193 } 194 195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 196 { 197 int tv = net_random() % delay; 198 199 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 200 in_dev_hold(in_dev); 201 } 202 203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 204 { 205 spin_lock_bh(&im->lock); 206 im->unsolicit_count = 0; 207 if (del_timer(&im->timer)) { 208 if ((long)(im->timer.expires-jiffies) < max_delay) { 209 add_timer(&im->timer); 210 im->tm_running = 1; 211 spin_unlock_bh(&im->lock); 212 return; 213 } 214 atomic_dec(&im->refcnt); 215 } 216 igmp_start_timer(im, max_delay); 217 spin_unlock_bh(&im->lock); 218 } 219 220 221 /* 222 * Send an IGMP report. 223 */ 224 225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 226 227 228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 229 int gdeleted, int sdeleted) 230 { 231 switch (type) { 232 case IGMPV3_MODE_IS_INCLUDE: 233 case IGMPV3_MODE_IS_EXCLUDE: 234 if (gdeleted || sdeleted) 235 return 0; 236 if (!(pmc->gsquery && !psf->sf_gsresp)) { 237 if (pmc->sfmode == MCAST_INCLUDE) 238 return 1; 239 /* don't include if this source is excluded 240 * in all filters 241 */ 242 if (psf->sf_count[MCAST_INCLUDE]) 243 return type == IGMPV3_MODE_IS_INCLUDE; 244 return pmc->sfcount[MCAST_EXCLUDE] == 245 psf->sf_count[MCAST_EXCLUDE]; 246 } 247 return 0; 248 case IGMPV3_CHANGE_TO_INCLUDE: 249 if (gdeleted || sdeleted) 250 return 0; 251 return psf->sf_count[MCAST_INCLUDE] != 0; 252 case IGMPV3_CHANGE_TO_EXCLUDE: 253 if (gdeleted || sdeleted) 254 return 0; 255 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 256 psf->sf_count[MCAST_INCLUDE]) 257 return 0; 258 return pmc->sfcount[MCAST_EXCLUDE] == 259 psf->sf_count[MCAST_EXCLUDE]; 260 case IGMPV3_ALLOW_NEW_SOURCES: 261 if (gdeleted || !psf->sf_crcount) 262 return 0; 263 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 264 case IGMPV3_BLOCK_OLD_SOURCES: 265 if (pmc->sfmode == MCAST_INCLUDE) 266 return gdeleted || (psf->sf_crcount && sdeleted); 267 return psf->sf_crcount && !gdeleted && !sdeleted; 268 } 269 return 0; 270 } 271 272 static int 273 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 274 { 275 struct ip_sf_list *psf; 276 int scount = 0; 277 278 for (psf=pmc->sources; psf; psf=psf->sf_next) { 279 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 280 continue; 281 scount++; 282 } 283 return scount; 284 } 285 286 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 287 { 288 struct sk_buff *skb; 289 struct rtable *rt; 290 struct iphdr *pip; 291 struct igmpv3_report *pig; 292 struct net *net = dev_net(dev); 293 294 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 295 if (skb == NULL) 296 return NULL; 297 298 { 299 struct flowi fl = { .oif = dev->ifindex, 300 .nl_u = { .ip4_u = { 301 .daddr = IGMPV3_ALL_MCR } }, 302 .proto = IPPROTO_IGMP }; 303 if (ip_route_output_key(net, &rt, &fl)) { 304 kfree_skb(skb); 305 return NULL; 306 } 307 } 308 if (rt->rt_src == 0) { 309 kfree_skb(skb); 310 ip_rt_put(rt); 311 return NULL; 312 } 313 314 skb_dst_set(skb, &rt->u.dst); 315 skb->dev = dev; 316 317 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 318 319 skb_reset_network_header(skb); 320 pip = ip_hdr(skb); 321 skb_put(skb, sizeof(struct iphdr) + 4); 322 323 pip->version = 4; 324 pip->ihl = (sizeof(struct iphdr)+4)>>2; 325 pip->tos = 0xc0; 326 pip->frag_off = htons(IP_DF); 327 pip->ttl = 1; 328 pip->daddr = rt->rt_dst; 329 pip->saddr = rt->rt_src; 330 pip->protocol = IPPROTO_IGMP; 331 pip->tot_len = 0; /* filled in later */ 332 ip_select_ident(pip, &rt->u.dst, NULL); 333 ((u8*)&pip[1])[0] = IPOPT_RA; 334 ((u8*)&pip[1])[1] = 4; 335 ((u8*)&pip[1])[2] = 0; 336 ((u8*)&pip[1])[3] = 0; 337 338 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 339 skb_put(skb, sizeof(*pig)); 340 pig = igmpv3_report_hdr(skb); 341 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 342 pig->resv1 = 0; 343 pig->csum = 0; 344 pig->resv2 = 0; 345 pig->ngrec = 0; 346 return skb; 347 } 348 349 static int igmpv3_sendpack(struct sk_buff *skb) 350 { 351 struct igmphdr *pig = igmp_hdr(skb); 352 const int igmplen = skb->tail - skb->transport_header; 353 354 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 355 356 return ip_local_out(skb); 357 } 358 359 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 360 { 361 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 362 } 363 364 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 365 int type, struct igmpv3_grec **ppgr) 366 { 367 struct net_device *dev = pmc->interface->dev; 368 struct igmpv3_report *pih; 369 struct igmpv3_grec *pgr; 370 371 if (!skb) 372 skb = igmpv3_newpack(dev, dev->mtu); 373 if (!skb) 374 return NULL; 375 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 376 pgr->grec_type = type; 377 pgr->grec_auxwords = 0; 378 pgr->grec_nsrcs = 0; 379 pgr->grec_mca = pmc->multiaddr; 380 pih = igmpv3_report_hdr(skb); 381 pih->ngrec = htons(ntohs(pih->ngrec)+1); 382 *ppgr = pgr; 383 return skb; 384 } 385 386 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 387 skb_tailroom(skb)) : 0) 388 389 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 390 int type, int gdeleted, int sdeleted) 391 { 392 struct net_device *dev = pmc->interface->dev; 393 struct igmpv3_report *pih; 394 struct igmpv3_grec *pgr = NULL; 395 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 396 int scount, stotal, first, isquery, truncate; 397 398 if (pmc->multiaddr == IGMP_ALL_HOSTS) 399 return skb; 400 401 isquery = type == IGMPV3_MODE_IS_INCLUDE || 402 type == IGMPV3_MODE_IS_EXCLUDE; 403 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 404 type == IGMPV3_CHANGE_TO_EXCLUDE; 405 406 stotal = scount = 0; 407 408 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 409 410 if (!*psf_list) 411 goto empty_source; 412 413 pih = skb ? igmpv3_report_hdr(skb) : NULL; 414 415 /* EX and TO_EX get a fresh packet, if needed */ 416 if (truncate) { 417 if (pih && pih->ngrec && 418 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 419 if (skb) 420 igmpv3_sendpack(skb); 421 skb = igmpv3_newpack(dev, dev->mtu); 422 } 423 } 424 first = 1; 425 psf_prev = NULL; 426 for (psf=*psf_list; psf; psf=psf_next) { 427 __be32 *psrc; 428 429 psf_next = psf->sf_next; 430 431 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 432 psf_prev = psf; 433 continue; 434 } 435 436 /* clear marks on query responses */ 437 if (isquery) 438 psf->sf_gsresp = 0; 439 440 if (AVAILABLE(skb) < sizeof(__be32) + 441 first*sizeof(struct igmpv3_grec)) { 442 if (truncate && !first) 443 break; /* truncate these */ 444 if (pgr) 445 pgr->grec_nsrcs = htons(scount); 446 if (skb) 447 igmpv3_sendpack(skb); 448 skb = igmpv3_newpack(dev, dev->mtu); 449 first = 1; 450 scount = 0; 451 } 452 if (first) { 453 skb = add_grhead(skb, pmc, type, &pgr); 454 first = 0; 455 } 456 if (!skb) 457 return NULL; 458 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 459 *psrc = psf->sf_inaddr; 460 scount++; stotal++; 461 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 462 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 463 psf->sf_crcount--; 464 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 465 if (psf_prev) 466 psf_prev->sf_next = psf->sf_next; 467 else 468 *psf_list = psf->sf_next; 469 kfree(psf); 470 continue; 471 } 472 } 473 psf_prev = psf; 474 } 475 476 empty_source: 477 if (!stotal) { 478 if (type == IGMPV3_ALLOW_NEW_SOURCES || 479 type == IGMPV3_BLOCK_OLD_SOURCES) 480 return skb; 481 if (pmc->crcount || isquery) { 482 /* make sure we have room for group header */ 483 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 484 igmpv3_sendpack(skb); 485 skb = NULL; /* add_grhead will get a new one */ 486 } 487 skb = add_grhead(skb, pmc, type, &pgr); 488 } 489 } 490 if (pgr) 491 pgr->grec_nsrcs = htons(scount); 492 493 if (isquery) 494 pmc->gsquery = 0; /* clear query state on report */ 495 return skb; 496 } 497 498 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 499 { 500 struct sk_buff *skb = NULL; 501 int type; 502 503 if (!pmc) { 504 read_lock(&in_dev->mc_list_lock); 505 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 506 if (pmc->multiaddr == IGMP_ALL_HOSTS) 507 continue; 508 spin_lock_bh(&pmc->lock); 509 if (pmc->sfcount[MCAST_EXCLUDE]) 510 type = IGMPV3_MODE_IS_EXCLUDE; 511 else 512 type = IGMPV3_MODE_IS_INCLUDE; 513 skb = add_grec(skb, pmc, type, 0, 0); 514 spin_unlock_bh(&pmc->lock); 515 } 516 read_unlock(&in_dev->mc_list_lock); 517 } else { 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 if (!skb) 527 return 0; 528 return igmpv3_sendpack(skb); 529 } 530 531 /* 532 * remove zero-count source records from a source filter list 533 */ 534 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 535 { 536 struct ip_sf_list *psf_prev, *psf_next, *psf; 537 538 psf_prev = NULL; 539 for (psf=*ppsf; psf; psf = psf_next) { 540 psf_next = psf->sf_next; 541 if (psf->sf_crcount == 0) { 542 if (psf_prev) 543 psf_prev->sf_next = psf->sf_next; 544 else 545 *ppsf = psf->sf_next; 546 kfree(psf); 547 } else 548 psf_prev = psf; 549 } 550 } 551 552 static void igmpv3_send_cr(struct in_device *in_dev) 553 { 554 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 555 struct sk_buff *skb = NULL; 556 int type, dtype; 557 558 read_lock(&in_dev->mc_list_lock); 559 spin_lock_bh(&in_dev->mc_tomb_lock); 560 561 /* deleted MCA's */ 562 pmc_prev = NULL; 563 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 564 pmc_next = pmc->next; 565 if (pmc->sfmode == MCAST_INCLUDE) { 566 type = IGMPV3_BLOCK_OLD_SOURCES; 567 dtype = IGMPV3_BLOCK_OLD_SOURCES; 568 skb = add_grec(skb, pmc, type, 1, 0); 569 skb = add_grec(skb, pmc, dtype, 1, 1); 570 } 571 if (pmc->crcount) { 572 if (pmc->sfmode == MCAST_EXCLUDE) { 573 type = IGMPV3_CHANGE_TO_INCLUDE; 574 skb = add_grec(skb, pmc, type, 1, 0); 575 } 576 pmc->crcount--; 577 if (pmc->crcount == 0) { 578 igmpv3_clear_zeros(&pmc->tomb); 579 igmpv3_clear_zeros(&pmc->sources); 580 } 581 } 582 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 583 if (pmc_prev) 584 pmc_prev->next = pmc_next; 585 else 586 in_dev->mc_tomb = pmc_next; 587 in_dev_put(pmc->interface); 588 kfree(pmc); 589 } else 590 pmc_prev = pmc; 591 } 592 spin_unlock_bh(&in_dev->mc_tomb_lock); 593 594 /* change recs */ 595 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 596 spin_lock_bh(&pmc->lock); 597 if (pmc->sfcount[MCAST_EXCLUDE]) { 598 type = IGMPV3_BLOCK_OLD_SOURCES; 599 dtype = IGMPV3_ALLOW_NEW_SOURCES; 600 } else { 601 type = IGMPV3_ALLOW_NEW_SOURCES; 602 dtype = IGMPV3_BLOCK_OLD_SOURCES; 603 } 604 skb = add_grec(skb, pmc, type, 0, 0); 605 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 606 607 /* filter mode changes */ 608 if (pmc->crcount) { 609 if (pmc->sfmode == MCAST_EXCLUDE) 610 type = IGMPV3_CHANGE_TO_EXCLUDE; 611 else 612 type = IGMPV3_CHANGE_TO_INCLUDE; 613 skb = add_grec(skb, pmc, type, 0, 0); 614 pmc->crcount--; 615 } 616 spin_unlock_bh(&pmc->lock); 617 } 618 read_unlock(&in_dev->mc_list_lock); 619 620 if (!skb) 621 return; 622 (void) igmpv3_sendpack(skb); 623 } 624 625 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 626 int type) 627 { 628 struct sk_buff *skb; 629 struct iphdr *iph; 630 struct igmphdr *ih; 631 struct rtable *rt; 632 struct net_device *dev = in_dev->dev; 633 struct net *net = dev_net(dev); 634 __be32 group = pmc ? pmc->multiaddr : 0; 635 __be32 dst; 636 637 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 638 return igmpv3_send_report(in_dev, pmc); 639 else if (type == IGMP_HOST_LEAVE_MESSAGE) 640 dst = IGMP_ALL_ROUTER; 641 else 642 dst = group; 643 644 { 645 struct flowi fl = { .oif = dev->ifindex, 646 .nl_u = { .ip4_u = { .daddr = dst } }, 647 .proto = IPPROTO_IGMP }; 648 if (ip_route_output_key(net, &rt, &fl)) 649 return -1; 650 } 651 if (rt->rt_src == 0) { 652 ip_rt_put(rt); 653 return -1; 654 } 655 656 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 657 if (skb == NULL) { 658 ip_rt_put(rt); 659 return -1; 660 } 661 662 skb_dst_set(skb, &rt->u.dst); 663 664 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 665 666 skb_reset_network_header(skb); 667 iph = ip_hdr(skb); 668 skb_put(skb, sizeof(struct iphdr) + 4); 669 670 iph->version = 4; 671 iph->ihl = (sizeof(struct iphdr)+4)>>2; 672 iph->tos = 0xc0; 673 iph->frag_off = htons(IP_DF); 674 iph->ttl = 1; 675 iph->daddr = dst; 676 iph->saddr = rt->rt_src; 677 iph->protocol = IPPROTO_IGMP; 678 ip_select_ident(iph, &rt->u.dst, NULL); 679 ((u8*)&iph[1])[0] = IPOPT_RA; 680 ((u8*)&iph[1])[1] = 4; 681 ((u8*)&iph[1])[2] = 0; 682 ((u8*)&iph[1])[3] = 0; 683 684 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 685 ih->type = type; 686 ih->code = 0; 687 ih->csum = 0; 688 ih->group = group; 689 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 690 691 return ip_local_out(skb); 692 } 693 694 static void igmp_gq_timer_expire(unsigned long data) 695 { 696 struct in_device *in_dev = (struct in_device *)data; 697 698 in_dev->mr_gq_running = 0; 699 igmpv3_send_report(in_dev, NULL); 700 __in_dev_put(in_dev); 701 } 702 703 static void igmp_ifc_timer_expire(unsigned long data) 704 { 705 struct in_device *in_dev = (struct in_device *)data; 706 707 igmpv3_send_cr(in_dev); 708 if (in_dev->mr_ifc_count) { 709 in_dev->mr_ifc_count--; 710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 711 } 712 __in_dev_put(in_dev); 713 } 714 715 static void igmp_ifc_event(struct in_device *in_dev) 716 { 717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 718 return; 719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 720 IGMP_Unsolicited_Report_Count; 721 igmp_ifc_start_timer(in_dev, 1); 722 } 723 724 725 static void igmp_timer_expire(unsigned long data) 726 { 727 struct ip_mc_list *im=(struct ip_mc_list *)data; 728 struct in_device *in_dev = im->interface; 729 730 spin_lock(&im->lock); 731 im->tm_running = 0; 732 733 if (im->unsolicit_count) { 734 im->unsolicit_count--; 735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 736 } 737 im->reporter = 1; 738 spin_unlock(&im->lock); 739 740 if (IGMP_V1_SEEN(in_dev)) 741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 742 else if (IGMP_V2_SEEN(in_dev)) 743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 744 else 745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 746 747 ip_ma_put(im); 748 } 749 750 /* mark EXCLUDE-mode sources */ 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 752 { 753 struct ip_sf_list *psf; 754 int i, scount; 755 756 scount = 0; 757 for (psf=pmc->sources; psf; psf=psf->sf_next) { 758 if (scount == nsrcs) 759 break; 760 for (i=0; i<nsrcs; i++) { 761 /* skip inactive filters */ 762 if (pmc->sfcount[MCAST_INCLUDE] || 763 pmc->sfcount[MCAST_EXCLUDE] != 764 psf->sf_count[MCAST_EXCLUDE]) 765 continue; 766 if (srcs[i] == psf->sf_inaddr) { 767 scount++; 768 break; 769 } 770 } 771 } 772 pmc->gsquery = 0; 773 if (scount == nsrcs) /* all sources excluded */ 774 return 0; 775 return 1; 776 } 777 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 779 { 780 struct ip_sf_list *psf; 781 int i, scount; 782 783 if (pmc->sfmode == MCAST_EXCLUDE) 784 return igmp_xmarksources(pmc, nsrcs, srcs); 785 786 /* mark INCLUDE-mode sources */ 787 scount = 0; 788 for (psf=pmc->sources; psf; psf=psf->sf_next) { 789 if (scount == nsrcs) 790 break; 791 for (i=0; i<nsrcs; i++) 792 if (srcs[i] == psf->sf_inaddr) { 793 psf->sf_gsresp = 1; 794 scount++; 795 break; 796 } 797 } 798 if (!scount) { 799 pmc->gsquery = 0; 800 return 0; 801 } 802 pmc->gsquery = 1; 803 return 1; 804 } 805 806 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 807 { 808 struct ip_mc_list *im; 809 810 /* Timers are only set for non-local groups */ 811 812 if (group == IGMP_ALL_HOSTS) 813 return; 814 815 read_lock(&in_dev->mc_list_lock); 816 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 817 if (im->multiaddr == group) { 818 igmp_stop_timer(im); 819 break; 820 } 821 } 822 read_unlock(&in_dev->mc_list_lock); 823 } 824 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 826 int len) 827 { 828 struct igmphdr *ih = igmp_hdr(skb); 829 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 830 struct ip_mc_list *im; 831 __be32 group = ih->group; 832 int max_delay; 833 int mark = 0; 834 835 836 if (len == 8) { 837 if (ih->code == 0) { 838 /* Alas, old v1 router presents here. */ 839 840 max_delay = IGMP_Query_Response_Interval; 841 in_dev->mr_v1_seen = jiffies + 842 IGMP_V1_Router_Present_Timeout; 843 group = 0; 844 } else { 845 /* v2 router present */ 846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 847 in_dev->mr_v2_seen = jiffies + 848 IGMP_V2_Router_Present_Timeout; 849 } 850 /* cancel the interface change timer */ 851 in_dev->mr_ifc_count = 0; 852 if (del_timer(&in_dev->mr_ifc_timer)) 853 __in_dev_put(in_dev); 854 /* clear deleted report items */ 855 igmpv3_clear_delrec(in_dev); 856 } else if (len < 12) { 857 return; /* ignore bogus packet; freed by caller */ 858 } else { /* v3 */ 859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 860 return; 861 862 ih3 = igmpv3_query_hdr(skb); 863 if (ih3->nsrcs) { 864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 865 + ntohs(ih3->nsrcs)*sizeof(__be32))) 866 return; 867 ih3 = igmpv3_query_hdr(skb); 868 } 869 870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 871 if (!max_delay) 872 max_delay = 1; /* can't mod w/ 0 */ 873 in_dev->mr_maxdelay = max_delay; 874 if (ih3->qrv) 875 in_dev->mr_qrv = ih3->qrv; 876 if (!group) { /* general query */ 877 if (ih3->nsrcs) 878 return; /* no sources allowed */ 879 igmp_gq_start_timer(in_dev); 880 return; 881 } 882 /* mark sources to include, if group & source-specific */ 883 mark = ih3->nsrcs != 0; 884 } 885 886 /* 887 * - Start the timers in all of our membership records 888 * that the query applies to for the interface on 889 * which the query arrived excl. those that belong 890 * to a "local" group (224.0.0.X) 891 * - For timers already running check if they need to 892 * be reset. 893 * - Use the igmp->igmp_code field as the maximum 894 * delay possible 895 */ 896 read_lock(&in_dev->mc_list_lock); 897 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 898 int changed; 899 900 if (group && group != im->multiaddr) 901 continue; 902 if (im->multiaddr == IGMP_ALL_HOSTS) 903 continue; 904 spin_lock_bh(&im->lock); 905 if (im->tm_running) 906 im->gsquery = im->gsquery && mark; 907 else 908 im->gsquery = mark; 909 changed = !im->gsquery || 910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 911 spin_unlock_bh(&im->lock); 912 if (changed) 913 igmp_mod_timer(im, max_delay); 914 } 915 read_unlock(&in_dev->mc_list_lock); 916 } 917 918 int igmp_rcv(struct sk_buff *skb) 919 { 920 /* This basically follows the spec line by line -- see RFC1112 */ 921 struct igmphdr *ih; 922 struct in_device *in_dev = in_dev_get(skb->dev); 923 int len = skb->len; 924 925 if (in_dev == NULL) 926 goto drop; 927 928 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 929 goto drop_ref; 930 931 switch (skb->ip_summed) { 932 case CHECKSUM_COMPLETE: 933 if (!csum_fold(skb->csum)) 934 break; 935 /* fall through */ 936 case CHECKSUM_NONE: 937 skb->csum = 0; 938 if (__skb_checksum_complete(skb)) 939 goto drop_ref; 940 } 941 942 ih = igmp_hdr(skb); 943 switch (ih->type) { 944 case IGMP_HOST_MEMBERSHIP_QUERY: 945 igmp_heard_query(in_dev, skb, len); 946 break; 947 case IGMP_HOST_MEMBERSHIP_REPORT: 948 case IGMPV2_HOST_MEMBERSHIP_REPORT: 949 case IGMPV3_HOST_MEMBERSHIP_REPORT: 950 /* Is it our report looped back? */ 951 if (skb_rtable(skb)->fl.iif == 0) 952 break; 953 /* don't rely on MC router hearing unicast reports */ 954 if (skb->pkt_type == PACKET_MULTICAST || 955 skb->pkt_type == PACKET_BROADCAST) 956 igmp_heard_report(in_dev, ih->group); 957 break; 958 case IGMP_PIM: 959 #ifdef CONFIG_IP_PIMSM_V1 960 in_dev_put(in_dev); 961 return pim_rcv_v1(skb); 962 #endif 963 case IGMP_DVMRP: 964 case IGMP_TRACE: 965 case IGMP_HOST_LEAVE_MESSAGE: 966 case IGMP_MTRACE: 967 case IGMP_MTRACE_RESP: 968 break; 969 default: 970 break; 971 } 972 973 drop_ref: 974 in_dev_put(in_dev); 975 drop: 976 kfree_skb(skb); 977 return 0; 978 } 979 980 #endif 981 982 983 /* 984 * Add a filter to a device 985 */ 986 987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 988 { 989 char buf[MAX_ADDR_LEN]; 990 struct net_device *dev = in_dev->dev; 991 992 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 993 We will get multicast token leakage, when IFF_MULTICAST 994 is changed. This check should be done in dev->set_multicast_list 995 routine. Something sort of: 996 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 997 --ANK 998 */ 999 if (arp_mc_map(addr, buf, dev, 0) == 0) 1000 dev_mc_add(dev, buf, dev->addr_len, 0); 1001 } 1002 1003 /* 1004 * Remove a filter from a device 1005 */ 1006 1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1008 { 1009 char buf[MAX_ADDR_LEN]; 1010 struct net_device *dev = in_dev->dev; 1011 1012 if (arp_mc_map(addr, buf, dev, 0) == 0) 1013 dev_mc_delete(dev, buf, dev->addr_len, 0); 1014 } 1015 1016 #ifdef CONFIG_IP_MULTICAST 1017 /* 1018 * deleted ip_mc_list manipulation 1019 */ 1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1021 { 1022 struct ip_mc_list *pmc; 1023 1024 /* this is an "ip_mc_list" for convenience; only the fields below 1025 * are actually used. In particular, the refcnt and users are not 1026 * used for management of the delete list. Using the same structure 1027 * for deleted items allows change reports to use common code with 1028 * non-deleted or query-response MCA's. 1029 */ 1030 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1031 if (!pmc) 1032 return; 1033 spin_lock_bh(&im->lock); 1034 pmc->interface = im->interface; 1035 in_dev_hold(in_dev); 1036 pmc->multiaddr = im->multiaddr; 1037 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1038 IGMP_Unsolicited_Report_Count; 1039 pmc->sfmode = im->sfmode; 1040 if (pmc->sfmode == MCAST_INCLUDE) { 1041 struct ip_sf_list *psf; 1042 1043 pmc->tomb = im->tomb; 1044 pmc->sources = im->sources; 1045 im->tomb = im->sources = NULL; 1046 for (psf=pmc->sources; psf; psf=psf->sf_next) 1047 psf->sf_crcount = pmc->crcount; 1048 } 1049 spin_unlock_bh(&im->lock); 1050 1051 spin_lock_bh(&in_dev->mc_tomb_lock); 1052 pmc->next = in_dev->mc_tomb; 1053 in_dev->mc_tomb = pmc; 1054 spin_unlock_bh(&in_dev->mc_tomb_lock); 1055 } 1056 1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1058 { 1059 struct ip_mc_list *pmc, *pmc_prev; 1060 struct ip_sf_list *psf, *psf_next; 1061 1062 spin_lock_bh(&in_dev->mc_tomb_lock); 1063 pmc_prev = NULL; 1064 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1065 if (pmc->multiaddr == multiaddr) 1066 break; 1067 pmc_prev = pmc; 1068 } 1069 if (pmc) { 1070 if (pmc_prev) 1071 pmc_prev->next = pmc->next; 1072 else 1073 in_dev->mc_tomb = pmc->next; 1074 } 1075 spin_unlock_bh(&in_dev->mc_tomb_lock); 1076 if (pmc) { 1077 for (psf=pmc->tomb; psf; psf=psf_next) { 1078 psf_next = psf->sf_next; 1079 kfree(psf); 1080 } 1081 in_dev_put(pmc->interface); 1082 kfree(pmc); 1083 } 1084 } 1085 1086 static void igmpv3_clear_delrec(struct in_device *in_dev) 1087 { 1088 struct ip_mc_list *pmc, *nextpmc; 1089 1090 spin_lock_bh(&in_dev->mc_tomb_lock); 1091 pmc = in_dev->mc_tomb; 1092 in_dev->mc_tomb = NULL; 1093 spin_unlock_bh(&in_dev->mc_tomb_lock); 1094 1095 for (; pmc; pmc = nextpmc) { 1096 nextpmc = pmc->next; 1097 ip_mc_clear_src(pmc); 1098 in_dev_put(pmc->interface); 1099 kfree(pmc); 1100 } 1101 /* clear dead sources, too */ 1102 read_lock(&in_dev->mc_list_lock); 1103 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1104 struct ip_sf_list *psf, *psf_next; 1105 1106 spin_lock_bh(&pmc->lock); 1107 psf = pmc->tomb; 1108 pmc->tomb = NULL; 1109 spin_unlock_bh(&pmc->lock); 1110 for (; psf; psf=psf_next) { 1111 psf_next = psf->sf_next; 1112 kfree(psf); 1113 } 1114 } 1115 read_unlock(&in_dev->mc_list_lock); 1116 } 1117 #endif 1118 1119 static void igmp_group_dropped(struct ip_mc_list *im) 1120 { 1121 struct in_device *in_dev = im->interface; 1122 #ifdef CONFIG_IP_MULTICAST 1123 int reporter; 1124 #endif 1125 1126 if (im->loaded) { 1127 im->loaded = 0; 1128 ip_mc_filter_del(in_dev, im->multiaddr); 1129 } 1130 1131 #ifdef CONFIG_IP_MULTICAST 1132 if (im->multiaddr == IGMP_ALL_HOSTS) 1133 return; 1134 1135 reporter = im->reporter; 1136 igmp_stop_timer(im); 1137 1138 if (!in_dev->dead) { 1139 if (IGMP_V1_SEEN(in_dev)) 1140 goto done; 1141 if (IGMP_V2_SEEN(in_dev)) { 1142 if (reporter) 1143 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1144 goto done; 1145 } 1146 /* IGMPv3 */ 1147 igmpv3_add_delrec(in_dev, im); 1148 1149 igmp_ifc_event(in_dev); 1150 } 1151 done: 1152 #endif 1153 ip_mc_clear_src(im); 1154 } 1155 1156 static void igmp_group_added(struct ip_mc_list *im) 1157 { 1158 struct in_device *in_dev = im->interface; 1159 1160 if (im->loaded == 0) { 1161 im->loaded = 1; 1162 ip_mc_filter_add(in_dev, im->multiaddr); 1163 } 1164 1165 #ifdef CONFIG_IP_MULTICAST 1166 if (im->multiaddr == IGMP_ALL_HOSTS) 1167 return; 1168 1169 if (in_dev->dead) 1170 return; 1171 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1172 spin_lock_bh(&im->lock); 1173 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1174 spin_unlock_bh(&im->lock); 1175 return; 1176 } 1177 /* else, v3 */ 1178 1179 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1180 IGMP_Unsolicited_Report_Count; 1181 igmp_ifc_event(in_dev); 1182 #endif 1183 } 1184 1185 1186 /* 1187 * Multicast list managers 1188 */ 1189 1190 1191 /* 1192 * A socket has joined a multicast group on device dev. 1193 */ 1194 1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1196 { 1197 struct ip_mc_list *im; 1198 1199 ASSERT_RTNL(); 1200 1201 for (im=in_dev->mc_list; im; im=im->next) { 1202 if (im->multiaddr == addr) { 1203 im->users++; 1204 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1205 goto out; 1206 } 1207 } 1208 1209 im = kmalloc(sizeof(*im), GFP_KERNEL); 1210 if (!im) 1211 goto out; 1212 1213 im->users = 1; 1214 im->interface = in_dev; 1215 in_dev_hold(in_dev); 1216 im->multiaddr = addr; 1217 /* initial mode is (EX, empty) */ 1218 im->sfmode = MCAST_EXCLUDE; 1219 im->sfcount[MCAST_INCLUDE] = 0; 1220 im->sfcount[MCAST_EXCLUDE] = 1; 1221 im->sources = NULL; 1222 im->tomb = NULL; 1223 im->crcount = 0; 1224 atomic_set(&im->refcnt, 1); 1225 spin_lock_init(&im->lock); 1226 #ifdef CONFIG_IP_MULTICAST 1227 im->tm_running = 0; 1228 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1229 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1230 im->reporter = 0; 1231 im->gsquery = 0; 1232 #endif 1233 im->loaded = 0; 1234 write_lock_bh(&in_dev->mc_list_lock); 1235 im->next = in_dev->mc_list; 1236 in_dev->mc_list = im; 1237 in_dev->mc_count++; 1238 write_unlock_bh(&in_dev->mc_list_lock); 1239 #ifdef CONFIG_IP_MULTICAST 1240 igmpv3_del_delrec(in_dev, im->multiaddr); 1241 #endif 1242 igmp_group_added(im); 1243 if (!in_dev->dead) 1244 ip_rt_multicast_event(in_dev); 1245 out: 1246 return; 1247 } 1248 1249 /* 1250 * Resend IGMP JOIN report; used for bonding. 1251 */ 1252 void ip_mc_rejoin_group(struct ip_mc_list *im) 1253 { 1254 #ifdef CONFIG_IP_MULTICAST 1255 struct in_device *in_dev = im->interface; 1256 1257 if (im->multiaddr == IGMP_ALL_HOSTS) 1258 return; 1259 1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1262 return; 1263 } 1264 /* else, v3 */ 1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1266 IGMP_Unsolicited_Report_Count; 1267 igmp_ifc_event(in_dev); 1268 #endif 1269 } 1270 1271 /* 1272 * A socket has left a multicast group on device dev 1273 */ 1274 1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1276 { 1277 struct ip_mc_list *i, **ip; 1278 1279 ASSERT_RTNL(); 1280 1281 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1282 if (i->multiaddr == addr) { 1283 if (--i->users == 0) { 1284 write_lock_bh(&in_dev->mc_list_lock); 1285 *ip = i->next; 1286 in_dev->mc_count--; 1287 write_unlock_bh(&in_dev->mc_list_lock); 1288 igmp_group_dropped(i); 1289 1290 if (!in_dev->dead) 1291 ip_rt_multicast_event(in_dev); 1292 1293 ip_ma_put(i); 1294 return; 1295 } 1296 break; 1297 } 1298 } 1299 } 1300 1301 /* Device changing type */ 1302 1303 void ip_mc_unmap(struct in_device *in_dev) 1304 { 1305 struct ip_mc_list *i; 1306 1307 ASSERT_RTNL(); 1308 1309 for (i = in_dev->mc_list; i; i = i->next) 1310 igmp_group_dropped(i); 1311 } 1312 1313 void ip_mc_remap(struct in_device *in_dev) 1314 { 1315 struct ip_mc_list *i; 1316 1317 ASSERT_RTNL(); 1318 1319 for (i = in_dev->mc_list; i; i = i->next) 1320 igmp_group_added(i); 1321 } 1322 1323 /* Device going down */ 1324 1325 void ip_mc_down(struct in_device *in_dev) 1326 { 1327 struct ip_mc_list *i; 1328 1329 ASSERT_RTNL(); 1330 1331 for (i=in_dev->mc_list; i; i=i->next) 1332 igmp_group_dropped(i); 1333 1334 #ifdef CONFIG_IP_MULTICAST 1335 in_dev->mr_ifc_count = 0; 1336 if (del_timer(&in_dev->mr_ifc_timer)) 1337 __in_dev_put(in_dev); 1338 in_dev->mr_gq_running = 0; 1339 if (del_timer(&in_dev->mr_gq_timer)) 1340 __in_dev_put(in_dev); 1341 igmpv3_clear_delrec(in_dev); 1342 #endif 1343 1344 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1345 } 1346 1347 void ip_mc_init_dev(struct in_device *in_dev) 1348 { 1349 ASSERT_RTNL(); 1350 1351 in_dev->mc_tomb = NULL; 1352 #ifdef CONFIG_IP_MULTICAST 1353 in_dev->mr_gq_running = 0; 1354 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1355 (unsigned long)in_dev); 1356 in_dev->mr_ifc_count = 0; 1357 in_dev->mc_count = 0; 1358 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1359 (unsigned long)in_dev); 1360 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1361 #endif 1362 1363 rwlock_init(&in_dev->mc_list_lock); 1364 spin_lock_init(&in_dev->mc_tomb_lock); 1365 } 1366 1367 /* Device going up */ 1368 1369 void ip_mc_up(struct in_device *in_dev) 1370 { 1371 struct ip_mc_list *i; 1372 1373 ASSERT_RTNL(); 1374 1375 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1376 1377 for (i=in_dev->mc_list; i; i=i->next) 1378 igmp_group_added(i); 1379 } 1380 1381 /* 1382 * Device is about to be destroyed: clean up. 1383 */ 1384 1385 void ip_mc_destroy_dev(struct in_device *in_dev) 1386 { 1387 struct ip_mc_list *i; 1388 1389 ASSERT_RTNL(); 1390 1391 /* Deactivate timers */ 1392 ip_mc_down(in_dev); 1393 1394 write_lock_bh(&in_dev->mc_list_lock); 1395 while ((i = in_dev->mc_list) != NULL) { 1396 in_dev->mc_list = i->next; 1397 in_dev->mc_count--; 1398 write_unlock_bh(&in_dev->mc_list_lock); 1399 igmp_group_dropped(i); 1400 ip_ma_put(i); 1401 1402 write_lock_bh(&in_dev->mc_list_lock); 1403 } 1404 write_unlock_bh(&in_dev->mc_list_lock); 1405 } 1406 1407 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1408 { 1409 struct flowi fl = { .nl_u = { .ip4_u = 1410 { .daddr = imr->imr_multiaddr.s_addr } } }; 1411 struct rtable *rt; 1412 struct net_device *dev = NULL; 1413 struct in_device *idev = NULL; 1414 1415 if (imr->imr_ifindex) { 1416 idev = inetdev_by_index(net, imr->imr_ifindex); 1417 if (idev) 1418 __in_dev_put(idev); 1419 return idev; 1420 } 1421 if (imr->imr_address.s_addr) { 1422 dev = ip_dev_find(net, imr->imr_address.s_addr); 1423 if (!dev) 1424 return NULL; 1425 dev_put(dev); 1426 } 1427 1428 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1429 dev = rt->u.dst.dev; 1430 ip_rt_put(rt); 1431 } 1432 if (dev) { 1433 imr->imr_ifindex = dev->ifindex; 1434 idev = __in_dev_get_rtnl(dev); 1435 } 1436 return idev; 1437 } 1438 1439 /* 1440 * Join a socket to a group 1441 */ 1442 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1443 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1444 1445 1446 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1447 __be32 *psfsrc) 1448 { 1449 struct ip_sf_list *psf, *psf_prev; 1450 int rv = 0; 1451 1452 psf_prev = NULL; 1453 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1454 if (psf->sf_inaddr == *psfsrc) 1455 break; 1456 psf_prev = psf; 1457 } 1458 if (!psf || psf->sf_count[sfmode] == 0) { 1459 /* source filter not found, or count wrong => bug */ 1460 return -ESRCH; 1461 } 1462 psf->sf_count[sfmode]--; 1463 if (psf->sf_count[sfmode] == 0) { 1464 ip_rt_multicast_event(pmc->interface); 1465 } 1466 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1467 #ifdef CONFIG_IP_MULTICAST 1468 struct in_device *in_dev = pmc->interface; 1469 #endif 1470 1471 /* no more filters for this source */ 1472 if (psf_prev) 1473 psf_prev->sf_next = psf->sf_next; 1474 else 1475 pmc->sources = psf->sf_next; 1476 #ifdef CONFIG_IP_MULTICAST 1477 if (psf->sf_oldin && 1478 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1479 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1480 IGMP_Unsolicited_Report_Count; 1481 psf->sf_next = pmc->tomb; 1482 pmc->tomb = psf; 1483 rv = 1; 1484 } else 1485 #endif 1486 kfree(psf); 1487 } 1488 return rv; 1489 } 1490 1491 #ifndef CONFIG_IP_MULTICAST 1492 #define igmp_ifc_event(x) do { } while (0) 1493 #endif 1494 1495 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1496 int sfcount, __be32 *psfsrc, int delta) 1497 { 1498 struct ip_mc_list *pmc; 1499 int changerec = 0; 1500 int i, err; 1501 1502 if (!in_dev) 1503 return -ENODEV; 1504 read_lock(&in_dev->mc_list_lock); 1505 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1506 if (*pmca == pmc->multiaddr) 1507 break; 1508 } 1509 if (!pmc) { 1510 /* MCA not found?? bug */ 1511 read_unlock(&in_dev->mc_list_lock); 1512 return -ESRCH; 1513 } 1514 spin_lock_bh(&pmc->lock); 1515 read_unlock(&in_dev->mc_list_lock); 1516 #ifdef CONFIG_IP_MULTICAST 1517 sf_markstate(pmc); 1518 #endif 1519 if (!delta) { 1520 err = -EINVAL; 1521 if (!pmc->sfcount[sfmode]) 1522 goto out_unlock; 1523 pmc->sfcount[sfmode]--; 1524 } 1525 err = 0; 1526 for (i=0; i<sfcount; i++) { 1527 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1528 1529 changerec |= rv > 0; 1530 if (!err && rv < 0) 1531 err = rv; 1532 } 1533 if (pmc->sfmode == MCAST_EXCLUDE && 1534 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1535 pmc->sfcount[MCAST_INCLUDE]) { 1536 #ifdef CONFIG_IP_MULTICAST 1537 struct ip_sf_list *psf; 1538 #endif 1539 1540 /* filter mode change */ 1541 pmc->sfmode = MCAST_INCLUDE; 1542 #ifdef CONFIG_IP_MULTICAST 1543 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1544 IGMP_Unsolicited_Report_Count; 1545 in_dev->mr_ifc_count = pmc->crcount; 1546 for (psf=pmc->sources; psf; psf = psf->sf_next) 1547 psf->sf_crcount = 0; 1548 igmp_ifc_event(pmc->interface); 1549 } else if (sf_setstate(pmc) || changerec) { 1550 igmp_ifc_event(pmc->interface); 1551 #endif 1552 } 1553 out_unlock: 1554 spin_unlock_bh(&pmc->lock); 1555 return err; 1556 } 1557 1558 /* 1559 * Add multicast single-source filter to the interface list 1560 */ 1561 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1562 __be32 *psfsrc, int delta) 1563 { 1564 struct ip_sf_list *psf, *psf_prev; 1565 1566 psf_prev = NULL; 1567 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1568 if (psf->sf_inaddr == *psfsrc) 1569 break; 1570 psf_prev = psf; 1571 } 1572 if (!psf) { 1573 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1574 if (!psf) 1575 return -ENOBUFS; 1576 psf->sf_inaddr = *psfsrc; 1577 if (psf_prev) { 1578 psf_prev->sf_next = psf; 1579 } else 1580 pmc->sources = psf; 1581 } 1582 psf->sf_count[sfmode]++; 1583 if (psf->sf_count[sfmode] == 1) { 1584 ip_rt_multicast_event(pmc->interface); 1585 } 1586 return 0; 1587 } 1588 1589 #ifdef CONFIG_IP_MULTICAST 1590 static void sf_markstate(struct ip_mc_list *pmc) 1591 { 1592 struct ip_sf_list *psf; 1593 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1594 1595 for (psf=pmc->sources; psf; psf=psf->sf_next) 1596 if (pmc->sfcount[MCAST_EXCLUDE]) { 1597 psf->sf_oldin = mca_xcount == 1598 psf->sf_count[MCAST_EXCLUDE] && 1599 !psf->sf_count[MCAST_INCLUDE]; 1600 } else 1601 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1602 } 1603 1604 static int sf_setstate(struct ip_mc_list *pmc) 1605 { 1606 struct ip_sf_list *psf, *dpsf; 1607 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1608 int qrv = pmc->interface->mr_qrv; 1609 int new_in, rv; 1610 1611 rv = 0; 1612 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1613 if (pmc->sfcount[MCAST_EXCLUDE]) { 1614 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1615 !psf->sf_count[MCAST_INCLUDE]; 1616 } else 1617 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1618 if (new_in) { 1619 if (!psf->sf_oldin) { 1620 struct ip_sf_list *prev = NULL; 1621 1622 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1623 if (dpsf->sf_inaddr == psf->sf_inaddr) 1624 break; 1625 prev = dpsf; 1626 } 1627 if (dpsf) { 1628 if (prev) 1629 prev->sf_next = dpsf->sf_next; 1630 else 1631 pmc->tomb = dpsf->sf_next; 1632 kfree(dpsf); 1633 } 1634 psf->sf_crcount = qrv; 1635 rv++; 1636 } 1637 } else if (psf->sf_oldin) { 1638 1639 psf->sf_crcount = 0; 1640 /* 1641 * add or update "delete" records if an active filter 1642 * is now inactive 1643 */ 1644 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1645 if (dpsf->sf_inaddr == psf->sf_inaddr) 1646 break; 1647 if (!dpsf) { 1648 dpsf = (struct ip_sf_list *) 1649 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1650 if (!dpsf) 1651 continue; 1652 *dpsf = *psf; 1653 /* pmc->lock held by callers */ 1654 dpsf->sf_next = pmc->tomb; 1655 pmc->tomb = dpsf; 1656 } 1657 dpsf->sf_crcount = qrv; 1658 rv++; 1659 } 1660 } 1661 return rv; 1662 } 1663 #endif 1664 1665 /* 1666 * Add multicast source filter list to the interface list 1667 */ 1668 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1669 int sfcount, __be32 *psfsrc, int delta) 1670 { 1671 struct ip_mc_list *pmc; 1672 int isexclude; 1673 int i, err; 1674 1675 if (!in_dev) 1676 return -ENODEV; 1677 read_lock(&in_dev->mc_list_lock); 1678 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1679 if (*pmca == pmc->multiaddr) 1680 break; 1681 } 1682 if (!pmc) { 1683 /* MCA not found?? bug */ 1684 read_unlock(&in_dev->mc_list_lock); 1685 return -ESRCH; 1686 } 1687 spin_lock_bh(&pmc->lock); 1688 read_unlock(&in_dev->mc_list_lock); 1689 1690 #ifdef CONFIG_IP_MULTICAST 1691 sf_markstate(pmc); 1692 #endif 1693 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1694 if (!delta) 1695 pmc->sfcount[sfmode]++; 1696 err = 0; 1697 for (i=0; i<sfcount; i++) { 1698 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1699 if (err) 1700 break; 1701 } 1702 if (err) { 1703 int j; 1704 1705 pmc->sfcount[sfmode]--; 1706 for (j=0; j<i; j++) 1707 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1708 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1709 #ifdef CONFIG_IP_MULTICAST 1710 struct ip_sf_list *psf; 1711 in_dev = pmc->interface; 1712 #endif 1713 1714 /* filter mode change */ 1715 if (pmc->sfcount[MCAST_EXCLUDE]) 1716 pmc->sfmode = MCAST_EXCLUDE; 1717 else if (pmc->sfcount[MCAST_INCLUDE]) 1718 pmc->sfmode = MCAST_INCLUDE; 1719 #ifdef CONFIG_IP_MULTICAST 1720 /* else no filters; keep old mode for reports */ 1721 1722 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1723 IGMP_Unsolicited_Report_Count; 1724 in_dev->mr_ifc_count = pmc->crcount; 1725 for (psf=pmc->sources; psf; psf = psf->sf_next) 1726 psf->sf_crcount = 0; 1727 igmp_ifc_event(in_dev); 1728 } else if (sf_setstate(pmc)) { 1729 igmp_ifc_event(in_dev); 1730 #endif 1731 } 1732 spin_unlock_bh(&pmc->lock); 1733 return err; 1734 } 1735 1736 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1737 { 1738 struct ip_sf_list *psf, *nextpsf; 1739 1740 for (psf=pmc->tomb; psf; psf=nextpsf) { 1741 nextpsf = psf->sf_next; 1742 kfree(psf); 1743 } 1744 pmc->tomb = NULL; 1745 for (psf=pmc->sources; psf; psf=nextpsf) { 1746 nextpsf = psf->sf_next; 1747 kfree(psf); 1748 } 1749 pmc->sources = NULL; 1750 pmc->sfmode = MCAST_EXCLUDE; 1751 pmc->sfcount[MCAST_INCLUDE] = 0; 1752 pmc->sfcount[MCAST_EXCLUDE] = 1; 1753 } 1754 1755 1756 /* 1757 * Join a multicast group 1758 */ 1759 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1760 { 1761 int err; 1762 __be32 addr = imr->imr_multiaddr.s_addr; 1763 struct ip_mc_socklist *iml = NULL, *i; 1764 struct in_device *in_dev; 1765 struct inet_sock *inet = inet_sk(sk); 1766 struct net *net = sock_net(sk); 1767 int ifindex; 1768 int count = 0; 1769 1770 if (!ipv4_is_multicast(addr)) 1771 return -EINVAL; 1772 1773 rtnl_lock(); 1774 1775 in_dev = ip_mc_find_dev(net, imr); 1776 1777 if (!in_dev) { 1778 iml = NULL; 1779 err = -ENODEV; 1780 goto done; 1781 } 1782 1783 err = -EADDRINUSE; 1784 ifindex = imr->imr_ifindex; 1785 for (i = inet->mc_list; i; i = i->next) { 1786 if (i->multi.imr_multiaddr.s_addr == addr && 1787 i->multi.imr_ifindex == ifindex) 1788 goto done; 1789 count++; 1790 } 1791 err = -ENOBUFS; 1792 if (count >= sysctl_igmp_max_memberships) 1793 goto done; 1794 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1795 if (iml == NULL) 1796 goto done; 1797 1798 memcpy(&iml->multi, imr, sizeof(*imr)); 1799 iml->next = inet->mc_list; 1800 iml->sflist = NULL; 1801 iml->sfmode = MCAST_EXCLUDE; 1802 inet->mc_list = iml; 1803 ip_mc_inc_group(in_dev, addr); 1804 err = 0; 1805 done: 1806 rtnl_unlock(); 1807 return err; 1808 } 1809 1810 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1811 struct in_device *in_dev) 1812 { 1813 int err; 1814 1815 if (iml->sflist == NULL) { 1816 /* any-source empty exclude case */ 1817 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1818 iml->sfmode, 0, NULL, 0); 1819 } 1820 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1821 iml->sfmode, iml->sflist->sl_count, 1822 iml->sflist->sl_addr, 0); 1823 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1824 iml->sflist = NULL; 1825 return err; 1826 } 1827 1828 /* 1829 * Ask a socket to leave a group. 1830 */ 1831 1832 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1833 { 1834 struct inet_sock *inet = inet_sk(sk); 1835 struct ip_mc_socklist *iml, **imlp; 1836 struct in_device *in_dev; 1837 struct net *net = sock_net(sk); 1838 __be32 group = imr->imr_multiaddr.s_addr; 1839 u32 ifindex; 1840 int ret = -EADDRNOTAVAIL; 1841 1842 rtnl_lock(); 1843 in_dev = ip_mc_find_dev(net, imr); 1844 ifindex = imr->imr_ifindex; 1845 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1846 if (iml->multi.imr_multiaddr.s_addr != group) 1847 continue; 1848 if (ifindex) { 1849 if (iml->multi.imr_ifindex != ifindex) 1850 continue; 1851 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1852 iml->multi.imr_address.s_addr) 1853 continue; 1854 1855 (void) ip_mc_leave_src(sk, iml, in_dev); 1856 1857 *imlp = iml->next; 1858 1859 if (in_dev) 1860 ip_mc_dec_group(in_dev, group); 1861 rtnl_unlock(); 1862 sock_kfree_s(sk, iml, sizeof(*iml)); 1863 return 0; 1864 } 1865 if (!in_dev) 1866 ret = -ENODEV; 1867 rtnl_unlock(); 1868 return ret; 1869 } 1870 1871 int ip_mc_source(int add, int omode, struct sock *sk, struct 1872 ip_mreq_source *mreqs, int ifindex) 1873 { 1874 int err; 1875 struct ip_mreqn imr; 1876 __be32 addr = mreqs->imr_multiaddr; 1877 struct ip_mc_socklist *pmc; 1878 struct in_device *in_dev = NULL; 1879 struct inet_sock *inet = inet_sk(sk); 1880 struct ip_sf_socklist *psl; 1881 struct net *net = sock_net(sk); 1882 int leavegroup = 0; 1883 int i, j, rv; 1884 1885 if (!ipv4_is_multicast(addr)) 1886 return -EINVAL; 1887 1888 rtnl_lock(); 1889 1890 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1891 imr.imr_address.s_addr = mreqs->imr_interface; 1892 imr.imr_ifindex = ifindex; 1893 in_dev = ip_mc_find_dev(net, &imr); 1894 1895 if (!in_dev) { 1896 err = -ENODEV; 1897 goto done; 1898 } 1899 err = -EADDRNOTAVAIL; 1900 1901 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1902 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1903 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1904 break; 1905 } 1906 if (!pmc) { /* must have a prior join */ 1907 err = -EINVAL; 1908 goto done; 1909 } 1910 /* if a source filter was set, must be the same mode as before */ 1911 if (pmc->sflist) { 1912 if (pmc->sfmode != omode) { 1913 err = -EINVAL; 1914 goto done; 1915 } 1916 } else if (pmc->sfmode != omode) { 1917 /* allow mode switches for empty-set filters */ 1918 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1919 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1920 NULL, 0); 1921 pmc->sfmode = omode; 1922 } 1923 1924 psl = pmc->sflist; 1925 if (!add) { 1926 if (!psl) 1927 goto done; /* err = -EADDRNOTAVAIL */ 1928 rv = !0; 1929 for (i=0; i<psl->sl_count; i++) { 1930 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1931 sizeof(__be32)); 1932 if (rv == 0) 1933 break; 1934 } 1935 if (rv) /* source not found */ 1936 goto done; /* err = -EADDRNOTAVAIL */ 1937 1938 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1939 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1940 leavegroup = 1; 1941 goto done; 1942 } 1943 1944 /* update the interface filter */ 1945 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1946 &mreqs->imr_sourceaddr, 1); 1947 1948 for (j=i+1; j<psl->sl_count; j++) 1949 psl->sl_addr[j-1] = psl->sl_addr[j]; 1950 psl->sl_count--; 1951 err = 0; 1952 goto done; 1953 } 1954 /* else, add a new source to the filter */ 1955 1956 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1957 err = -ENOBUFS; 1958 goto done; 1959 } 1960 if (!psl || psl->sl_count == psl->sl_max) { 1961 struct ip_sf_socklist *newpsl; 1962 int count = IP_SFBLOCK; 1963 1964 if (psl) 1965 count += psl->sl_max; 1966 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1967 if (!newpsl) { 1968 err = -ENOBUFS; 1969 goto done; 1970 } 1971 newpsl->sl_max = count; 1972 newpsl->sl_count = count - IP_SFBLOCK; 1973 if (psl) { 1974 for (i=0; i<psl->sl_count; i++) 1975 newpsl->sl_addr[i] = psl->sl_addr[i]; 1976 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1977 } 1978 pmc->sflist = psl = newpsl; 1979 } 1980 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1981 for (i=0; i<psl->sl_count; i++) { 1982 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1983 sizeof(__be32)); 1984 if (rv == 0) 1985 break; 1986 } 1987 if (rv == 0) /* address already there is an error */ 1988 goto done; 1989 for (j=psl->sl_count-1; j>=i; j--) 1990 psl->sl_addr[j+1] = psl->sl_addr[j]; 1991 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1992 psl->sl_count++; 1993 err = 0; 1994 /* update the interface list */ 1995 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1996 &mreqs->imr_sourceaddr, 1); 1997 done: 1998 rtnl_unlock(); 1999 if (leavegroup) 2000 return ip_mc_leave_group(sk, &imr); 2001 return err; 2002 } 2003 2004 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2005 { 2006 int err = 0; 2007 struct ip_mreqn imr; 2008 __be32 addr = msf->imsf_multiaddr; 2009 struct ip_mc_socklist *pmc; 2010 struct in_device *in_dev; 2011 struct inet_sock *inet = inet_sk(sk); 2012 struct ip_sf_socklist *newpsl, *psl; 2013 struct net *net = sock_net(sk); 2014 int leavegroup = 0; 2015 2016 if (!ipv4_is_multicast(addr)) 2017 return -EINVAL; 2018 if (msf->imsf_fmode != MCAST_INCLUDE && 2019 msf->imsf_fmode != MCAST_EXCLUDE) 2020 return -EINVAL; 2021 2022 rtnl_lock(); 2023 2024 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2025 imr.imr_address.s_addr = msf->imsf_interface; 2026 imr.imr_ifindex = ifindex; 2027 in_dev = ip_mc_find_dev(net, &imr); 2028 2029 if (!in_dev) { 2030 err = -ENODEV; 2031 goto done; 2032 } 2033 2034 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2035 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2036 leavegroup = 1; 2037 goto done; 2038 } 2039 2040 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2041 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2042 pmc->multi.imr_ifindex == imr.imr_ifindex) 2043 break; 2044 } 2045 if (!pmc) { /* must have a prior join */ 2046 err = -EINVAL; 2047 goto done; 2048 } 2049 if (msf->imsf_numsrc) { 2050 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2051 GFP_KERNEL); 2052 if (!newpsl) { 2053 err = -ENOBUFS; 2054 goto done; 2055 } 2056 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2057 memcpy(newpsl->sl_addr, msf->imsf_slist, 2058 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2059 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2060 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2061 if (err) { 2062 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2063 goto done; 2064 } 2065 } else { 2066 newpsl = NULL; 2067 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2068 msf->imsf_fmode, 0, NULL, 0); 2069 } 2070 psl = pmc->sflist; 2071 if (psl) { 2072 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2073 psl->sl_count, psl->sl_addr, 0); 2074 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2075 } else 2076 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2077 0, NULL, 0); 2078 pmc->sflist = newpsl; 2079 pmc->sfmode = msf->imsf_fmode; 2080 err = 0; 2081 done: 2082 rtnl_unlock(); 2083 if (leavegroup) 2084 err = ip_mc_leave_group(sk, &imr); 2085 return err; 2086 } 2087 2088 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2089 struct ip_msfilter __user *optval, int __user *optlen) 2090 { 2091 int err, len, count, copycount; 2092 struct ip_mreqn imr; 2093 __be32 addr = msf->imsf_multiaddr; 2094 struct ip_mc_socklist *pmc; 2095 struct in_device *in_dev; 2096 struct inet_sock *inet = inet_sk(sk); 2097 struct ip_sf_socklist *psl; 2098 struct net *net = sock_net(sk); 2099 2100 if (!ipv4_is_multicast(addr)) 2101 return -EINVAL; 2102 2103 rtnl_lock(); 2104 2105 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2106 imr.imr_address.s_addr = msf->imsf_interface; 2107 imr.imr_ifindex = 0; 2108 in_dev = ip_mc_find_dev(net, &imr); 2109 2110 if (!in_dev) { 2111 err = -ENODEV; 2112 goto done; 2113 } 2114 err = -EADDRNOTAVAIL; 2115 2116 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2117 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2118 pmc->multi.imr_ifindex == imr.imr_ifindex) 2119 break; 2120 } 2121 if (!pmc) /* must have a prior join */ 2122 goto done; 2123 msf->imsf_fmode = pmc->sfmode; 2124 psl = pmc->sflist; 2125 rtnl_unlock(); 2126 if (!psl) { 2127 len = 0; 2128 count = 0; 2129 } else { 2130 count = psl->sl_count; 2131 } 2132 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2133 len = copycount * sizeof(psl->sl_addr[0]); 2134 msf->imsf_numsrc = count; 2135 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2136 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2137 return -EFAULT; 2138 } 2139 if (len && 2140 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2141 return -EFAULT; 2142 return 0; 2143 done: 2144 rtnl_unlock(); 2145 return err; 2146 } 2147 2148 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2149 struct group_filter __user *optval, int __user *optlen) 2150 { 2151 int err, i, count, copycount; 2152 struct sockaddr_in *psin; 2153 __be32 addr; 2154 struct ip_mc_socklist *pmc; 2155 struct inet_sock *inet = inet_sk(sk); 2156 struct ip_sf_socklist *psl; 2157 2158 psin = (struct sockaddr_in *)&gsf->gf_group; 2159 if (psin->sin_family != AF_INET) 2160 return -EINVAL; 2161 addr = psin->sin_addr.s_addr; 2162 if (!ipv4_is_multicast(addr)) 2163 return -EINVAL; 2164 2165 rtnl_lock(); 2166 2167 err = -EADDRNOTAVAIL; 2168 2169 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2170 if (pmc->multi.imr_multiaddr.s_addr == addr && 2171 pmc->multi.imr_ifindex == gsf->gf_interface) 2172 break; 2173 } 2174 if (!pmc) /* must have a prior join */ 2175 goto done; 2176 gsf->gf_fmode = pmc->sfmode; 2177 psl = pmc->sflist; 2178 rtnl_unlock(); 2179 count = psl ? psl->sl_count : 0; 2180 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2181 gsf->gf_numsrc = count; 2182 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2183 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2184 return -EFAULT; 2185 } 2186 for (i=0; i<copycount; i++) { 2187 struct sockaddr_storage ss; 2188 2189 psin = (struct sockaddr_in *)&ss; 2190 memset(&ss, 0, sizeof(ss)); 2191 psin->sin_family = AF_INET; 2192 psin->sin_addr.s_addr = psl->sl_addr[i]; 2193 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2194 return -EFAULT; 2195 } 2196 return 0; 2197 done: 2198 rtnl_unlock(); 2199 return err; 2200 } 2201 2202 /* 2203 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2204 */ 2205 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2206 { 2207 struct inet_sock *inet = inet_sk(sk); 2208 struct ip_mc_socklist *pmc; 2209 struct ip_sf_socklist *psl; 2210 int i; 2211 2212 if (!ipv4_is_multicast(loc_addr)) 2213 return 1; 2214 2215 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2216 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2217 pmc->multi.imr_ifindex == dif) 2218 break; 2219 } 2220 if (!pmc) 2221 return inet->mc_all; 2222 psl = pmc->sflist; 2223 if (!psl) 2224 return pmc->sfmode == MCAST_EXCLUDE; 2225 2226 for (i=0; i<psl->sl_count; i++) { 2227 if (psl->sl_addr[i] == rmt_addr) 2228 break; 2229 } 2230 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2231 return 0; 2232 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2233 return 0; 2234 return 1; 2235 } 2236 2237 /* 2238 * A socket is closing. 2239 */ 2240 2241 void ip_mc_drop_socket(struct sock *sk) 2242 { 2243 struct inet_sock *inet = inet_sk(sk); 2244 struct ip_mc_socklist *iml; 2245 struct net *net = sock_net(sk); 2246 2247 if (inet->mc_list == NULL) 2248 return; 2249 2250 rtnl_lock(); 2251 while ((iml = inet->mc_list) != NULL) { 2252 struct in_device *in_dev; 2253 inet->mc_list = iml->next; 2254 2255 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2256 (void) ip_mc_leave_src(sk, iml, in_dev); 2257 if (in_dev != NULL) { 2258 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2259 in_dev_put(in_dev); 2260 } 2261 sock_kfree_s(sk, iml, sizeof(*iml)); 2262 } 2263 rtnl_unlock(); 2264 } 2265 2266 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2267 { 2268 struct ip_mc_list *im; 2269 struct ip_sf_list *psf; 2270 int rv = 0; 2271 2272 read_lock(&in_dev->mc_list_lock); 2273 for (im=in_dev->mc_list; im; im=im->next) { 2274 if (im->multiaddr == mc_addr) 2275 break; 2276 } 2277 if (im && proto == IPPROTO_IGMP) { 2278 rv = 1; 2279 } else if (im) { 2280 if (src_addr) { 2281 for (psf=im->sources; psf; psf=psf->sf_next) { 2282 if (psf->sf_inaddr == src_addr) 2283 break; 2284 } 2285 if (psf) 2286 rv = psf->sf_count[MCAST_INCLUDE] || 2287 psf->sf_count[MCAST_EXCLUDE] != 2288 im->sfcount[MCAST_EXCLUDE]; 2289 else 2290 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2291 } else 2292 rv = 1; /* unspecified source; tentatively allow */ 2293 } 2294 read_unlock(&in_dev->mc_list_lock); 2295 return rv; 2296 } 2297 2298 #if defined(CONFIG_PROC_FS) 2299 struct igmp_mc_iter_state { 2300 struct seq_net_private p; 2301 struct net_device *dev; 2302 struct in_device *in_dev; 2303 }; 2304 2305 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2306 2307 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2308 { 2309 struct net *net = seq_file_net(seq); 2310 struct ip_mc_list *im = NULL; 2311 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2312 2313 state->in_dev = NULL; 2314 for_each_netdev(net, state->dev) { 2315 struct in_device *in_dev; 2316 in_dev = in_dev_get(state->dev); 2317 if (!in_dev) 2318 continue; 2319 read_lock(&in_dev->mc_list_lock); 2320 im = in_dev->mc_list; 2321 if (im) { 2322 state->in_dev = in_dev; 2323 break; 2324 } 2325 read_unlock(&in_dev->mc_list_lock); 2326 in_dev_put(in_dev); 2327 } 2328 return im; 2329 } 2330 2331 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2332 { 2333 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2334 im = im->next; 2335 while (!im) { 2336 if (likely(state->in_dev != NULL)) { 2337 read_unlock(&state->in_dev->mc_list_lock); 2338 in_dev_put(state->in_dev); 2339 } 2340 state->dev = next_net_device(state->dev); 2341 if (!state->dev) { 2342 state->in_dev = NULL; 2343 break; 2344 } 2345 state->in_dev = in_dev_get(state->dev); 2346 if (!state->in_dev) 2347 continue; 2348 read_lock(&state->in_dev->mc_list_lock); 2349 im = state->in_dev->mc_list; 2350 } 2351 return im; 2352 } 2353 2354 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2355 { 2356 struct ip_mc_list *im = igmp_mc_get_first(seq); 2357 if (im) 2358 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2359 --pos; 2360 return pos ? NULL : im; 2361 } 2362 2363 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2364 __acquires(dev_base_lock) 2365 { 2366 read_lock(&dev_base_lock); 2367 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2368 } 2369 2370 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2371 { 2372 struct ip_mc_list *im; 2373 if (v == SEQ_START_TOKEN) 2374 im = igmp_mc_get_first(seq); 2375 else 2376 im = igmp_mc_get_next(seq, v); 2377 ++*pos; 2378 return im; 2379 } 2380 2381 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2382 __releases(dev_base_lock) 2383 { 2384 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2385 if (likely(state->in_dev != NULL)) { 2386 read_unlock(&state->in_dev->mc_list_lock); 2387 in_dev_put(state->in_dev); 2388 state->in_dev = NULL; 2389 } 2390 state->dev = NULL; 2391 read_unlock(&dev_base_lock); 2392 } 2393 2394 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2395 { 2396 if (v == SEQ_START_TOKEN) 2397 seq_puts(seq, 2398 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2399 else { 2400 struct ip_mc_list *im = (struct ip_mc_list *)v; 2401 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2402 char *querier; 2403 #ifdef CONFIG_IP_MULTICAST 2404 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2405 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2406 "V3"; 2407 #else 2408 querier = "NONE"; 2409 #endif 2410 2411 if (state->in_dev->mc_list == im) { 2412 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2413 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2414 } 2415 2416 seq_printf(seq, 2417 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2418 im->multiaddr, im->users, 2419 im->tm_running, im->tm_running ? 2420 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2421 im->reporter); 2422 } 2423 return 0; 2424 } 2425 2426 static const struct seq_operations igmp_mc_seq_ops = { 2427 .start = igmp_mc_seq_start, 2428 .next = igmp_mc_seq_next, 2429 .stop = igmp_mc_seq_stop, 2430 .show = igmp_mc_seq_show, 2431 }; 2432 2433 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2434 { 2435 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2436 sizeof(struct igmp_mc_iter_state)); 2437 } 2438 2439 static const struct file_operations igmp_mc_seq_fops = { 2440 .owner = THIS_MODULE, 2441 .open = igmp_mc_seq_open, 2442 .read = seq_read, 2443 .llseek = seq_lseek, 2444 .release = seq_release_net, 2445 }; 2446 2447 struct igmp_mcf_iter_state { 2448 struct seq_net_private p; 2449 struct net_device *dev; 2450 struct in_device *idev; 2451 struct ip_mc_list *im; 2452 }; 2453 2454 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2455 2456 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2457 { 2458 struct net *net = seq_file_net(seq); 2459 struct ip_sf_list *psf = NULL; 2460 struct ip_mc_list *im = NULL; 2461 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2462 2463 state->idev = NULL; 2464 state->im = NULL; 2465 for_each_netdev(net, state->dev) { 2466 struct in_device *idev; 2467 idev = in_dev_get(state->dev); 2468 if (unlikely(idev == NULL)) 2469 continue; 2470 read_lock(&idev->mc_list_lock); 2471 im = idev->mc_list; 2472 if (likely(im != NULL)) { 2473 spin_lock_bh(&im->lock); 2474 psf = im->sources; 2475 if (likely(psf != NULL)) { 2476 state->im = im; 2477 state->idev = idev; 2478 break; 2479 } 2480 spin_unlock_bh(&im->lock); 2481 } 2482 read_unlock(&idev->mc_list_lock); 2483 in_dev_put(idev); 2484 } 2485 return psf; 2486 } 2487 2488 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2489 { 2490 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2491 2492 psf = psf->sf_next; 2493 while (!psf) { 2494 spin_unlock_bh(&state->im->lock); 2495 state->im = state->im->next; 2496 while (!state->im) { 2497 if (likely(state->idev != NULL)) { 2498 read_unlock(&state->idev->mc_list_lock); 2499 in_dev_put(state->idev); 2500 } 2501 state->dev = next_net_device(state->dev); 2502 if (!state->dev) { 2503 state->idev = NULL; 2504 goto out; 2505 } 2506 state->idev = in_dev_get(state->dev); 2507 if (!state->idev) 2508 continue; 2509 read_lock(&state->idev->mc_list_lock); 2510 state->im = state->idev->mc_list; 2511 } 2512 if (!state->im) 2513 break; 2514 spin_lock_bh(&state->im->lock); 2515 psf = state->im->sources; 2516 } 2517 out: 2518 return psf; 2519 } 2520 2521 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2522 { 2523 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2524 if (psf) 2525 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2526 --pos; 2527 return pos ? NULL : psf; 2528 } 2529 2530 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2531 { 2532 read_lock(&dev_base_lock); 2533 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2534 } 2535 2536 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2537 { 2538 struct ip_sf_list *psf; 2539 if (v == SEQ_START_TOKEN) 2540 psf = igmp_mcf_get_first(seq); 2541 else 2542 psf = igmp_mcf_get_next(seq, v); 2543 ++*pos; 2544 return psf; 2545 } 2546 2547 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2548 { 2549 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2550 if (likely(state->im != NULL)) { 2551 spin_unlock_bh(&state->im->lock); 2552 state->im = NULL; 2553 } 2554 if (likely(state->idev != NULL)) { 2555 read_unlock(&state->idev->mc_list_lock); 2556 in_dev_put(state->idev); 2557 state->idev = NULL; 2558 } 2559 state->dev = NULL; 2560 read_unlock(&dev_base_lock); 2561 } 2562 2563 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2564 { 2565 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2566 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2567 2568 if (v == SEQ_START_TOKEN) { 2569 seq_printf(seq, 2570 "%3s %6s " 2571 "%10s %10s %6s %6s\n", "Idx", 2572 "Device", "MCA", 2573 "SRC", "INC", "EXC"); 2574 } else { 2575 seq_printf(seq, 2576 "%3d %6.6s 0x%08x " 2577 "0x%08x %6lu %6lu\n", 2578 state->dev->ifindex, state->dev->name, 2579 ntohl(state->im->multiaddr), 2580 ntohl(psf->sf_inaddr), 2581 psf->sf_count[MCAST_INCLUDE], 2582 psf->sf_count[MCAST_EXCLUDE]); 2583 } 2584 return 0; 2585 } 2586 2587 static const struct seq_operations igmp_mcf_seq_ops = { 2588 .start = igmp_mcf_seq_start, 2589 .next = igmp_mcf_seq_next, 2590 .stop = igmp_mcf_seq_stop, 2591 .show = igmp_mcf_seq_show, 2592 }; 2593 2594 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2595 { 2596 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2597 sizeof(struct igmp_mcf_iter_state)); 2598 } 2599 2600 static const struct file_operations igmp_mcf_seq_fops = { 2601 .owner = THIS_MODULE, 2602 .open = igmp_mcf_seq_open, 2603 .read = seq_read, 2604 .llseek = seq_lseek, 2605 .release = seq_release_net, 2606 }; 2607 2608 static int igmp_net_init(struct net *net) 2609 { 2610 struct proc_dir_entry *pde; 2611 2612 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2613 if (!pde) 2614 goto out_igmp; 2615 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2616 if (!pde) 2617 goto out_mcfilter; 2618 return 0; 2619 2620 out_mcfilter: 2621 proc_net_remove(net, "igmp"); 2622 out_igmp: 2623 return -ENOMEM; 2624 } 2625 2626 static void igmp_net_exit(struct net *net) 2627 { 2628 proc_net_remove(net, "mcfilter"); 2629 proc_net_remove(net, "igmp"); 2630 } 2631 2632 static struct pernet_operations igmp_net_ops = { 2633 .init = igmp_net_init, 2634 .exit = igmp_net_exit, 2635 }; 2636 2637 int __init igmp_mc_proc_init(void) 2638 { 2639 return register_pernet_subsys(&igmp_net_ops); 2640 } 2641 #endif 2642 2643 EXPORT_SYMBOL(ip_mc_dec_group); 2644 EXPORT_SYMBOL(ip_mc_inc_group); 2645 EXPORT_SYMBOL(ip_mc_join_group); 2646 EXPORT_SYMBOL(ip_mc_rejoin_group); 2647