1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * This code implements the IGMP protocol as defined in RFC1112. There has 5 * been a further revision of this protocol since which is now supported. 6 * 7 * If you have trouble with this module be careful what gcc you have used, 8 * the older version didn't come out right using gcc 2.5.8, the newer one 9 * seems to fall out with gcc 2.6.2. 10 * 11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $ 12 * 13 * Authors: 14 * Alan Cox <Alan.Cox@linux.org> 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License 18 * as published by the Free Software Foundation; either version 19 * 2 of the License, or (at your option) any later version. 20 * 21 * Fixes: 22 * 23 * Alan Cox : Added lots of __inline__ to optimise 24 * the memory usage of all the tiny little 25 * functions. 26 * Alan Cox : Dumped the header building experiment. 27 * Alan Cox : Minor tweaks ready for multicast routing 28 * and extended IGMP protocol. 29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 30 * writes utterly bogus code otherwise (sigh) 31 * fixed IGMP loopback to behave in the manner 32 * desired by mrouted, fixed the fact it has been 33 * broken since 1.3.6 and cleaned up a few minor 34 * points. 35 * 36 * Chih-Jen Chang : Tried to revise IGMP to Version 2 37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 38 * The enhancements are mainly based on Steve Deering's 39 * ipmulti-3.5 source code. 40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 42 * the mrouted version on that device. 43 * Chih-Jen Chang : Added the max_resp_time parameter to 44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 45 * to identify the multicast router version 46 * and do what the IGMP version 2 specified. 47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 48 * Tsu-Sheng Tsao if the specified time expired. 49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 50 * Alan Cox : Use GFP_ATOMIC in the right places. 51 * Christian Daudt : igmp timer wasn't set for local group 52 * memberships but was being deleted, 53 * which caused a "del_timer() called 54 * from %p with timer not initialized\n" 55 * message (960131). 56 * Christian Daudt : removed del_timer from 57 * igmp_timer_expire function (960205). 58 * Christian Daudt : igmp_heard_report now only calls 59 * igmp_timer_expire if tm->running is 60 * true (960216). 61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 62 * igmp_heard_query never trigger. Expiry 63 * miscalculation fixed in igmp_heard_query 64 * and random() made to return unsigned to 65 * prevent negative expiry times. 66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 67 * fix from pending 2.1.x patches. 68 * Alan Cox: Forget to enable FDDI support earlier. 69 * Alexey Kuznetsov: Fixed leaving groups on device down. 70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 71 * David L Stevens: IGMPv3 support, with help from 72 * Vinay Kulkarni 73 */ 74 75 #include <linux/module.h> 76 #include <asm/uaccess.h> 77 #include <asm/system.h> 78 #include <linux/types.h> 79 #include <linux/kernel.h> 80 #include <linux/jiffies.h> 81 #include <linux/string.h> 82 #include <linux/socket.h> 83 #include <linux/sockios.h> 84 #include <linux/in.h> 85 #include <linux/inet.h> 86 #include <linux/netdevice.h> 87 #include <linux/skbuff.h> 88 #include <linux/inetdevice.h> 89 #include <linux/igmp.h> 90 #include <linux/if_arp.h> 91 #include <linux/rtnetlink.h> 92 #include <linux/times.h> 93 94 #include <net/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) (ipv4_devconf.force_igmp_version == 1 || \ 132 (in_dev)->cnf.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) (ipv4_devconf.force_igmp_version == 2 || \ 136 (in_dev)->cnf.force_igmp_version == 2 || \ 137 ((in_dev)->mr_v2_seen && \ 138 time_before(jiffies, (in_dev)->mr_v2_seen))) 139 140 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 141 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 142 static void igmpv3_clear_delrec(struct in_device *in_dev); 143 static int sf_setstate(struct ip_mc_list *pmc); 144 static void sf_markstate(struct ip_mc_list *pmc); 145 #endif 146 static void ip_mc_clear_src(struct ip_mc_list *pmc); 147 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 148 int sfcount, __be32 *psfsrc, int delta); 149 150 static void ip_ma_put(struct ip_mc_list *im) 151 { 152 if (atomic_dec_and_test(&im->refcnt)) { 153 in_dev_put(im->interface); 154 kfree(im); 155 } 156 } 157 158 #ifdef CONFIG_IP_MULTICAST 159 160 /* 161 * Timer management 162 */ 163 164 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 165 { 166 spin_lock_bh(&im->lock); 167 if (del_timer(&im->timer)) 168 atomic_dec(&im->refcnt); 169 im->tm_running=0; 170 im->reporter = 0; 171 im->unsolicit_count = 0; 172 spin_unlock_bh(&im->lock); 173 } 174 175 /* It must be called with locked im->lock */ 176 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 177 { 178 int tv=net_random() % max_delay; 179 180 im->tm_running=1; 181 if (!mod_timer(&im->timer, jiffies+tv+2)) 182 atomic_inc(&im->refcnt); 183 } 184 185 static void igmp_gq_start_timer(struct in_device *in_dev) 186 { 187 int tv = net_random() % in_dev->mr_maxdelay; 188 189 in_dev->mr_gq_running = 1; 190 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 191 in_dev_hold(in_dev); 192 } 193 194 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 195 { 196 int tv = net_random() % delay; 197 198 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 199 in_dev_hold(in_dev); 200 } 201 202 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 203 { 204 spin_lock_bh(&im->lock); 205 im->unsolicit_count = 0; 206 if (del_timer(&im->timer)) { 207 if ((long)(im->timer.expires-jiffies) < max_delay) { 208 add_timer(&im->timer); 209 im->tm_running=1; 210 spin_unlock_bh(&im->lock); 211 return; 212 } 213 atomic_dec(&im->refcnt); 214 } 215 igmp_start_timer(im, max_delay); 216 spin_unlock_bh(&im->lock); 217 } 218 219 220 /* 221 * Send an IGMP report. 222 */ 223 224 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 225 226 227 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 228 int gdeleted, int sdeleted) 229 { 230 switch (type) { 231 case IGMPV3_MODE_IS_INCLUDE: 232 case IGMPV3_MODE_IS_EXCLUDE: 233 if (gdeleted || sdeleted) 234 return 0; 235 if (!(pmc->gsquery && !psf->sf_gsresp)) { 236 if (pmc->sfmode == MCAST_INCLUDE) 237 return 1; 238 /* don't include if this source is excluded 239 * in all filters 240 */ 241 if (psf->sf_count[MCAST_INCLUDE]) 242 return type == IGMPV3_MODE_IS_INCLUDE; 243 return pmc->sfcount[MCAST_EXCLUDE] == 244 psf->sf_count[MCAST_EXCLUDE]; 245 } 246 return 0; 247 case IGMPV3_CHANGE_TO_INCLUDE: 248 if (gdeleted || sdeleted) 249 return 0; 250 return psf->sf_count[MCAST_INCLUDE] != 0; 251 case IGMPV3_CHANGE_TO_EXCLUDE: 252 if (gdeleted || sdeleted) 253 return 0; 254 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 255 psf->sf_count[MCAST_INCLUDE]) 256 return 0; 257 return pmc->sfcount[MCAST_EXCLUDE] == 258 psf->sf_count[MCAST_EXCLUDE]; 259 case IGMPV3_ALLOW_NEW_SOURCES: 260 if (gdeleted || !psf->sf_crcount) 261 return 0; 262 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 263 case IGMPV3_BLOCK_OLD_SOURCES: 264 if (pmc->sfmode == MCAST_INCLUDE) 265 return gdeleted || (psf->sf_crcount && sdeleted); 266 return psf->sf_crcount && !gdeleted && !sdeleted; 267 } 268 return 0; 269 } 270 271 static int 272 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 273 { 274 struct ip_sf_list *psf; 275 int scount = 0; 276 277 for (psf=pmc->sources; psf; psf=psf->sf_next) { 278 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 279 continue; 280 scount++; 281 } 282 return scount; 283 } 284 285 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 286 { 287 struct sk_buff *skb; 288 struct rtable *rt; 289 struct iphdr *pip; 290 struct igmpv3_report *pig; 291 292 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); 293 if (skb == NULL) 294 return NULL; 295 296 { 297 struct flowi fl = { .oif = dev->ifindex, 298 .nl_u = { .ip4_u = { 299 .daddr = IGMPV3_ALL_MCR } }, 300 .proto = IPPROTO_IGMP }; 301 if (ip_route_output_key(&rt, &fl)) { 302 kfree_skb(skb); 303 return NULL; 304 } 305 } 306 if (rt->rt_src == 0) { 307 kfree_skb(skb); 308 ip_rt_put(rt); 309 return NULL; 310 } 311 312 skb->dst = &rt->u.dst; 313 skb->dev = dev; 314 315 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 316 317 skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); 318 319 pip->version = 4; 320 pip->ihl = (sizeof(struct iphdr)+4)>>2; 321 pip->tos = 0xc0; 322 pip->frag_off = htons(IP_DF); 323 pip->ttl = 1; 324 pip->daddr = rt->rt_dst; 325 pip->saddr = rt->rt_src; 326 pip->protocol = IPPROTO_IGMP; 327 pip->tot_len = 0; /* filled in later */ 328 ip_select_ident(pip, &rt->u.dst, NULL); 329 ((u8*)&pip[1])[0] = IPOPT_RA; 330 ((u8*)&pip[1])[1] = 4; 331 ((u8*)&pip[1])[2] = 0; 332 ((u8*)&pip[1])[3] = 0; 333 334 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); 335 skb->h.igmph = (struct igmphdr *)pig; 336 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 337 pig->resv1 = 0; 338 pig->csum = 0; 339 pig->resv2 = 0; 340 pig->ngrec = 0; 341 return skb; 342 } 343 344 static int igmpv3_sendpack(struct sk_buff *skb) 345 { 346 struct iphdr *pip = skb->nh.iph; 347 struct igmphdr *pig = skb->h.igmph; 348 int iplen, igmplen; 349 350 iplen = skb->tail - (unsigned char *)skb->nh.iph; 351 pip->tot_len = htons(iplen); 352 ip_send_check(pip); 353 354 igmplen = skb->tail - (unsigned char *)skb->h.igmph; 355 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); 356 357 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, 358 dst_output); 359 } 360 361 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 362 { 363 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 364 } 365 366 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 367 int type, struct igmpv3_grec **ppgr) 368 { 369 struct net_device *dev = pmc->interface->dev; 370 struct igmpv3_report *pih; 371 struct igmpv3_grec *pgr; 372 373 if (!skb) 374 skb = igmpv3_newpack(dev, dev->mtu); 375 if (!skb) 376 return NULL; 377 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 378 pgr->grec_type = type; 379 pgr->grec_auxwords = 0; 380 pgr->grec_nsrcs = 0; 381 pgr->grec_mca = pmc->multiaddr; 382 pih = (struct igmpv3_report *)skb->h.igmph; 383 pih->ngrec = htons(ntohs(pih->ngrec)+1); 384 *ppgr = pgr; 385 return skb; 386 } 387 388 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 389 skb_tailroom(skb)) : 0) 390 391 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 392 int type, int gdeleted, int sdeleted) 393 { 394 struct net_device *dev = pmc->interface->dev; 395 struct igmpv3_report *pih; 396 struct igmpv3_grec *pgr = NULL; 397 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 398 int scount, stotal, first, isquery, truncate; 399 400 if (pmc->multiaddr == IGMP_ALL_HOSTS) 401 return skb; 402 403 isquery = type == IGMPV3_MODE_IS_INCLUDE || 404 type == IGMPV3_MODE_IS_EXCLUDE; 405 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 406 type == IGMPV3_CHANGE_TO_EXCLUDE; 407 408 stotal = scount = 0; 409 410 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 411 412 if (!*psf_list) 413 goto empty_source; 414 415 pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL; 416 417 /* EX and TO_EX get a fresh packet, if needed */ 418 if (truncate) { 419 if (pih && pih->ngrec && 420 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 421 if (skb) 422 igmpv3_sendpack(skb); 423 skb = igmpv3_newpack(dev, dev->mtu); 424 } 425 } 426 first = 1; 427 psf_prev = NULL; 428 for (psf=*psf_list; psf; psf=psf_next) { 429 __be32 *psrc; 430 431 psf_next = psf->sf_next; 432 433 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 434 psf_prev = psf; 435 continue; 436 } 437 438 /* clear marks on query responses */ 439 if (isquery) 440 psf->sf_gsresp = 0; 441 442 if (AVAILABLE(skb) < sizeof(__be32) + 443 first*sizeof(struct igmpv3_grec)) { 444 if (truncate && !first) 445 break; /* truncate these */ 446 if (pgr) 447 pgr->grec_nsrcs = htons(scount); 448 if (skb) 449 igmpv3_sendpack(skb); 450 skb = igmpv3_newpack(dev, dev->mtu); 451 first = 1; 452 scount = 0; 453 } 454 if (first) { 455 skb = add_grhead(skb, pmc, type, &pgr); 456 first = 0; 457 } 458 if (!skb) 459 return NULL; 460 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 461 *psrc = psf->sf_inaddr; 462 scount++; stotal++; 463 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 464 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 465 psf->sf_crcount--; 466 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 467 if (psf_prev) 468 psf_prev->sf_next = psf->sf_next; 469 else 470 *psf_list = psf->sf_next; 471 kfree(psf); 472 continue; 473 } 474 } 475 psf_prev = psf; 476 } 477 478 empty_source: 479 if (!stotal) { 480 if (type == IGMPV3_ALLOW_NEW_SOURCES || 481 type == IGMPV3_BLOCK_OLD_SOURCES) 482 return skb; 483 if (pmc->crcount || isquery) { 484 /* make sure we have room for group header */ 485 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 486 igmpv3_sendpack(skb); 487 skb = NULL; /* add_grhead will get a new one */ 488 } 489 skb = add_grhead(skb, pmc, type, &pgr); 490 } 491 } 492 if (pgr) 493 pgr->grec_nsrcs = htons(scount); 494 495 if (isquery) 496 pmc->gsquery = 0; /* clear query state on report */ 497 return skb; 498 } 499 500 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 501 { 502 struct sk_buff *skb = NULL; 503 int type; 504 505 if (!pmc) { 506 read_lock(&in_dev->mc_list_lock); 507 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 508 if (pmc->multiaddr == IGMP_ALL_HOSTS) 509 continue; 510 spin_lock_bh(&pmc->lock); 511 if (pmc->sfcount[MCAST_EXCLUDE]) 512 type = IGMPV3_MODE_IS_EXCLUDE; 513 else 514 type = IGMPV3_MODE_IS_INCLUDE; 515 skb = add_grec(skb, pmc, type, 0, 0); 516 spin_unlock_bh(&pmc->lock); 517 } 518 read_unlock(&in_dev->mc_list_lock); 519 } else { 520 spin_lock_bh(&pmc->lock); 521 if (pmc->sfcount[MCAST_EXCLUDE]) 522 type = IGMPV3_MODE_IS_EXCLUDE; 523 else 524 type = IGMPV3_MODE_IS_INCLUDE; 525 skb = add_grec(skb, pmc, type, 0, 0); 526 spin_unlock_bh(&pmc->lock); 527 } 528 if (!skb) 529 return 0; 530 return igmpv3_sendpack(skb); 531 } 532 533 /* 534 * remove zero-count source records from a source filter list 535 */ 536 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 537 { 538 struct ip_sf_list *psf_prev, *psf_next, *psf; 539 540 psf_prev = NULL; 541 for (psf=*ppsf; psf; psf = psf_next) { 542 psf_next = psf->sf_next; 543 if (psf->sf_crcount == 0) { 544 if (psf_prev) 545 psf_prev->sf_next = psf->sf_next; 546 else 547 *ppsf = psf->sf_next; 548 kfree(psf); 549 } else 550 psf_prev = psf; 551 } 552 } 553 554 static void igmpv3_send_cr(struct in_device *in_dev) 555 { 556 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 557 struct sk_buff *skb = NULL; 558 int type, dtype; 559 560 read_lock(&in_dev->mc_list_lock); 561 spin_lock_bh(&in_dev->mc_tomb_lock); 562 563 /* deleted MCA's */ 564 pmc_prev = NULL; 565 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 566 pmc_next = pmc->next; 567 if (pmc->sfmode == MCAST_INCLUDE) { 568 type = IGMPV3_BLOCK_OLD_SOURCES; 569 dtype = IGMPV3_BLOCK_OLD_SOURCES; 570 skb = add_grec(skb, pmc, type, 1, 0); 571 skb = add_grec(skb, pmc, dtype, 1, 1); 572 } 573 if (pmc->crcount) { 574 if (pmc->sfmode == MCAST_EXCLUDE) { 575 type = IGMPV3_CHANGE_TO_INCLUDE; 576 skb = add_grec(skb, pmc, type, 1, 0); 577 } 578 pmc->crcount--; 579 if (pmc->crcount == 0) { 580 igmpv3_clear_zeros(&pmc->tomb); 581 igmpv3_clear_zeros(&pmc->sources); 582 } 583 } 584 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 585 if (pmc_prev) 586 pmc_prev->next = pmc_next; 587 else 588 in_dev->mc_tomb = pmc_next; 589 in_dev_put(pmc->interface); 590 kfree(pmc); 591 } else 592 pmc_prev = pmc; 593 } 594 spin_unlock_bh(&in_dev->mc_tomb_lock); 595 596 /* change recs */ 597 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 598 spin_lock_bh(&pmc->lock); 599 if (pmc->sfcount[MCAST_EXCLUDE]) { 600 type = IGMPV3_BLOCK_OLD_SOURCES; 601 dtype = IGMPV3_ALLOW_NEW_SOURCES; 602 } else { 603 type = IGMPV3_ALLOW_NEW_SOURCES; 604 dtype = IGMPV3_BLOCK_OLD_SOURCES; 605 } 606 skb = add_grec(skb, pmc, type, 0, 0); 607 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 608 609 /* filter mode changes */ 610 if (pmc->crcount) { 611 if (pmc->sfmode == MCAST_EXCLUDE) 612 type = IGMPV3_CHANGE_TO_EXCLUDE; 613 else 614 type = IGMPV3_CHANGE_TO_INCLUDE; 615 skb = add_grec(skb, pmc, type, 0, 0); 616 pmc->crcount--; 617 } 618 spin_unlock_bh(&pmc->lock); 619 } 620 read_unlock(&in_dev->mc_list_lock); 621 622 if (!skb) 623 return; 624 (void) igmpv3_sendpack(skb); 625 } 626 627 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 628 int type) 629 { 630 struct sk_buff *skb; 631 struct iphdr *iph; 632 struct igmphdr *ih; 633 struct rtable *rt; 634 struct net_device *dev = in_dev->dev; 635 __be32 group = pmc ? pmc->multiaddr : 0; 636 __be32 dst; 637 638 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 639 return igmpv3_send_report(in_dev, pmc); 640 else if (type == IGMP_HOST_LEAVE_MESSAGE) 641 dst = IGMP_ALL_ROUTER; 642 else 643 dst = group; 644 645 { 646 struct flowi fl = { .oif = dev->ifindex, 647 .nl_u = { .ip4_u = { .daddr = dst } }, 648 .proto = IPPROTO_IGMP }; 649 if (ip_route_output_key(&rt, &fl)) 650 return -1; 651 } 652 if (rt->rt_src == 0) { 653 ip_rt_put(rt); 654 return -1; 655 } 656 657 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 658 if (skb == NULL) { 659 ip_rt_put(rt); 660 return -1; 661 } 662 663 skb->dst = &rt->u.dst; 664 665 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 666 667 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); 668 669 iph->version = 4; 670 iph->ihl = (sizeof(struct iphdr)+4)>>2; 671 iph->tos = 0xc0; 672 iph->frag_off = htons(IP_DF); 673 iph->ttl = 1; 674 iph->daddr = dst; 675 iph->saddr = rt->rt_src; 676 iph->protocol = IPPROTO_IGMP; 677 iph->tot_len = htons(IGMP_SIZE); 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 ip_send_check(iph); 684 685 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 686 ih->type=type; 687 ih->code=0; 688 ih->csum=0; 689 ih->group=group; 690 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 691 692 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 693 dst_output); 694 } 695 696 static void igmp_gq_timer_expire(unsigned long data) 697 { 698 struct in_device *in_dev = (struct in_device *)data; 699 700 in_dev->mr_gq_running = 0; 701 igmpv3_send_report(in_dev, NULL); 702 __in_dev_put(in_dev); 703 } 704 705 static void igmp_ifc_timer_expire(unsigned long data) 706 { 707 struct in_device *in_dev = (struct in_device *)data; 708 709 igmpv3_send_cr(in_dev); 710 if (in_dev->mr_ifc_count) { 711 in_dev->mr_ifc_count--; 712 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 713 } 714 __in_dev_put(in_dev); 715 } 716 717 static void igmp_ifc_event(struct in_device *in_dev) 718 { 719 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 720 return; 721 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 722 IGMP_Unsolicited_Report_Count; 723 igmp_ifc_start_timer(in_dev, 1); 724 } 725 726 727 static void igmp_timer_expire(unsigned long data) 728 { 729 struct ip_mc_list *im=(struct ip_mc_list *)data; 730 struct in_device *in_dev = im->interface; 731 732 spin_lock(&im->lock); 733 im->tm_running=0; 734 735 if (im->unsolicit_count) { 736 im->unsolicit_count--; 737 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 738 } 739 im->reporter = 1; 740 spin_unlock(&im->lock); 741 742 if (IGMP_V1_SEEN(in_dev)) 743 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 744 else if (IGMP_V2_SEEN(in_dev)) 745 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 746 else 747 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 748 749 ip_ma_put(im); 750 } 751 752 /* mark EXCLUDE-mode sources */ 753 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 754 { 755 struct ip_sf_list *psf; 756 int i, scount; 757 758 scount = 0; 759 for (psf=pmc->sources; psf; psf=psf->sf_next) { 760 if (scount == nsrcs) 761 break; 762 for (i=0; i<nsrcs; i++) { 763 /* skip inactive filters */ 764 if (pmc->sfcount[MCAST_INCLUDE] || 765 pmc->sfcount[MCAST_EXCLUDE] != 766 psf->sf_count[MCAST_EXCLUDE]) 767 continue; 768 if (srcs[i] == psf->sf_inaddr) { 769 scount++; 770 break; 771 } 772 } 773 } 774 pmc->gsquery = 0; 775 if (scount == nsrcs) /* all sources excluded */ 776 return 0; 777 return 1; 778 } 779 780 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 781 { 782 struct ip_sf_list *psf; 783 int i, scount; 784 785 if (pmc->sfmode == MCAST_EXCLUDE) 786 return igmp_xmarksources(pmc, nsrcs, srcs); 787 788 /* mark INCLUDE-mode sources */ 789 scount = 0; 790 for (psf=pmc->sources; psf; psf=psf->sf_next) { 791 if (scount == nsrcs) 792 break; 793 for (i=0; i<nsrcs; i++) 794 if (srcs[i] == psf->sf_inaddr) { 795 psf->sf_gsresp = 1; 796 scount++; 797 break; 798 } 799 } 800 if (!scount) { 801 pmc->gsquery = 0; 802 return 0; 803 } 804 pmc->gsquery = 1; 805 return 1; 806 } 807 808 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 809 { 810 struct ip_mc_list *im; 811 812 /* Timers are only set for non-local groups */ 813 814 if (group == IGMP_ALL_HOSTS) 815 return; 816 817 read_lock(&in_dev->mc_list_lock); 818 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 819 if (im->multiaddr == group) { 820 igmp_stop_timer(im); 821 break; 822 } 823 } 824 read_unlock(&in_dev->mc_list_lock); 825 } 826 827 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 828 int len) 829 { 830 struct igmphdr *ih = skb->h.igmph; 831 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; 832 struct ip_mc_list *im; 833 __be32 group = ih->group; 834 int max_delay; 835 int mark = 0; 836 837 838 if (len == 8) { 839 if (ih->code == 0) { 840 /* Alas, old v1 router presents here. */ 841 842 max_delay = IGMP_Query_Response_Interval; 843 in_dev->mr_v1_seen = jiffies + 844 IGMP_V1_Router_Present_Timeout; 845 group = 0; 846 } else { 847 /* v2 router present */ 848 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 849 in_dev->mr_v2_seen = jiffies + 850 IGMP_V2_Router_Present_Timeout; 851 } 852 /* cancel the interface change timer */ 853 in_dev->mr_ifc_count = 0; 854 if (del_timer(&in_dev->mr_ifc_timer)) 855 __in_dev_put(in_dev); 856 /* clear deleted report items */ 857 igmpv3_clear_delrec(in_dev); 858 } else if (len < 12) { 859 return; /* ignore bogus packet; freed by caller */ 860 } else { /* v3 */ 861 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 862 return; 863 864 ih3 = (struct igmpv3_query *) skb->h.raw; 865 if (ih3->nsrcs) { 866 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 867 + ntohs(ih3->nsrcs)*sizeof(__be32))) 868 return; 869 ih3 = (struct igmpv3_query *) skb->h.raw; 870 } 871 872 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 873 if (!max_delay) 874 max_delay = 1; /* can't mod w/ 0 */ 875 in_dev->mr_maxdelay = max_delay; 876 if (ih3->qrv) 877 in_dev->mr_qrv = ih3->qrv; 878 if (!group) { /* general query */ 879 if (ih3->nsrcs) 880 return; /* no sources allowed */ 881 igmp_gq_start_timer(in_dev); 882 return; 883 } 884 /* mark sources to include, if group & source-specific */ 885 mark = ih3->nsrcs != 0; 886 } 887 888 /* 889 * - Start the timers in all of our membership records 890 * that the query applies to for the interface on 891 * which the query arrived excl. those that belong 892 * to a "local" group (224.0.0.X) 893 * - For timers already running check if they need to 894 * be reset. 895 * - Use the igmp->igmp_code field as the maximum 896 * delay possible 897 */ 898 read_lock(&in_dev->mc_list_lock); 899 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 900 int changed; 901 902 if (group && group != im->multiaddr) 903 continue; 904 if (im->multiaddr == IGMP_ALL_HOSTS) 905 continue; 906 spin_lock_bh(&im->lock); 907 if (im->tm_running) 908 im->gsquery = im->gsquery && mark; 909 else 910 im->gsquery = mark; 911 changed = !im->gsquery || 912 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 913 spin_unlock_bh(&im->lock); 914 if (changed) 915 igmp_mod_timer(im, max_delay); 916 } 917 read_unlock(&in_dev->mc_list_lock); 918 } 919 920 int igmp_rcv(struct sk_buff *skb) 921 { 922 /* This basically follows the spec line by line -- see RFC1112 */ 923 struct igmphdr *ih; 924 struct in_device *in_dev = in_dev_get(skb->dev); 925 int len = skb->len; 926 927 if (in_dev==NULL) { 928 kfree_skb(skb); 929 return 0; 930 } 931 932 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 933 goto drop; 934 935 switch (skb->ip_summed) { 936 case CHECKSUM_COMPLETE: 937 if (!csum_fold(skb->csum)) 938 break; 939 /* fall through */ 940 case CHECKSUM_NONE: 941 skb->csum = 0; 942 if (__skb_checksum_complete(skb)) 943 goto drop; 944 } 945 946 ih = skb->h.igmph; 947 switch (ih->type) { 948 case IGMP_HOST_MEMBERSHIP_QUERY: 949 igmp_heard_query(in_dev, skb, len); 950 break; 951 case IGMP_HOST_MEMBERSHIP_REPORT: 952 case IGMPV2_HOST_MEMBERSHIP_REPORT: 953 case IGMPV3_HOST_MEMBERSHIP_REPORT: 954 /* Is it our report looped back? */ 955 if (((struct rtable*)skb->dst)->fl.iif == 0) 956 break; 957 /* don't rely on MC router hearing unicast reports */ 958 if (skb->pkt_type == PACKET_MULTICAST || 959 skb->pkt_type == PACKET_BROADCAST) 960 igmp_heard_report(in_dev, ih->group); 961 break; 962 case IGMP_PIM: 963 #ifdef CONFIG_IP_PIMSM_V1 964 in_dev_put(in_dev); 965 return pim_rcv_v1(skb); 966 #endif 967 case IGMP_DVMRP: 968 case IGMP_TRACE: 969 case IGMP_HOST_LEAVE_MESSAGE: 970 case IGMP_MTRACE: 971 case IGMP_MTRACE_RESP: 972 break; 973 default: 974 break; 975 } 976 977 drop: 978 in_dev_put(in_dev); 979 kfree_skb(skb); 980 return 0; 981 } 982 983 #endif 984 985 986 /* 987 * Add a filter to a device 988 */ 989 990 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 991 { 992 char buf[MAX_ADDR_LEN]; 993 struct net_device *dev = in_dev->dev; 994 995 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 996 We will get multicast token leakage, when IFF_MULTICAST 997 is changed. This check should be done in dev->set_multicast_list 998 routine. Something sort of: 999 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1000 --ANK 1001 */ 1002 if (arp_mc_map(addr, buf, dev, 0) == 0) 1003 dev_mc_add(dev,buf,dev->addr_len,0); 1004 } 1005 1006 /* 1007 * Remove a filter from a device 1008 */ 1009 1010 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1011 { 1012 char buf[MAX_ADDR_LEN]; 1013 struct net_device *dev = in_dev->dev; 1014 1015 if (arp_mc_map(addr, buf, dev, 0) == 0) 1016 dev_mc_delete(dev,buf,dev->addr_len,0); 1017 } 1018 1019 #ifdef CONFIG_IP_MULTICAST 1020 /* 1021 * deleted ip_mc_list manipulation 1022 */ 1023 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1024 { 1025 struct ip_mc_list *pmc; 1026 1027 /* this is an "ip_mc_list" for convenience; only the fields below 1028 * are actually used. In particular, the refcnt and users are not 1029 * used for management of the delete list. Using the same structure 1030 * for deleted items allows change reports to use common code with 1031 * non-deleted or query-response MCA's. 1032 */ 1033 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1034 if (!pmc) 1035 return; 1036 spin_lock_bh(&im->lock); 1037 pmc->interface = im->interface; 1038 in_dev_hold(in_dev); 1039 pmc->multiaddr = im->multiaddr; 1040 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1041 IGMP_Unsolicited_Report_Count; 1042 pmc->sfmode = im->sfmode; 1043 if (pmc->sfmode == MCAST_INCLUDE) { 1044 struct ip_sf_list *psf; 1045 1046 pmc->tomb = im->tomb; 1047 pmc->sources = im->sources; 1048 im->tomb = im->sources = NULL; 1049 for (psf=pmc->sources; psf; psf=psf->sf_next) 1050 psf->sf_crcount = pmc->crcount; 1051 } 1052 spin_unlock_bh(&im->lock); 1053 1054 spin_lock_bh(&in_dev->mc_tomb_lock); 1055 pmc->next = in_dev->mc_tomb; 1056 in_dev->mc_tomb = pmc; 1057 spin_unlock_bh(&in_dev->mc_tomb_lock); 1058 } 1059 1060 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1061 { 1062 struct ip_mc_list *pmc, *pmc_prev; 1063 struct ip_sf_list *psf, *psf_next; 1064 1065 spin_lock_bh(&in_dev->mc_tomb_lock); 1066 pmc_prev = NULL; 1067 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1068 if (pmc->multiaddr == multiaddr) 1069 break; 1070 pmc_prev = pmc; 1071 } 1072 if (pmc) { 1073 if (pmc_prev) 1074 pmc_prev->next = pmc->next; 1075 else 1076 in_dev->mc_tomb = pmc->next; 1077 } 1078 spin_unlock_bh(&in_dev->mc_tomb_lock); 1079 if (pmc) { 1080 for (psf=pmc->tomb; psf; psf=psf_next) { 1081 psf_next = psf->sf_next; 1082 kfree(psf); 1083 } 1084 in_dev_put(pmc->interface); 1085 kfree(pmc); 1086 } 1087 } 1088 1089 static void igmpv3_clear_delrec(struct in_device *in_dev) 1090 { 1091 struct ip_mc_list *pmc, *nextpmc; 1092 1093 spin_lock_bh(&in_dev->mc_tomb_lock); 1094 pmc = in_dev->mc_tomb; 1095 in_dev->mc_tomb = NULL; 1096 spin_unlock_bh(&in_dev->mc_tomb_lock); 1097 1098 for (; pmc; pmc = nextpmc) { 1099 nextpmc = pmc->next; 1100 ip_mc_clear_src(pmc); 1101 in_dev_put(pmc->interface); 1102 kfree(pmc); 1103 } 1104 /* clear dead sources, too */ 1105 read_lock(&in_dev->mc_list_lock); 1106 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1107 struct ip_sf_list *psf, *psf_next; 1108 1109 spin_lock_bh(&pmc->lock); 1110 psf = pmc->tomb; 1111 pmc->tomb = NULL; 1112 spin_unlock_bh(&pmc->lock); 1113 for (; psf; psf=psf_next) { 1114 psf_next = psf->sf_next; 1115 kfree(psf); 1116 } 1117 } 1118 read_unlock(&in_dev->mc_list_lock); 1119 } 1120 #endif 1121 1122 static void igmp_group_dropped(struct ip_mc_list *im) 1123 { 1124 struct in_device *in_dev = im->interface; 1125 #ifdef CONFIG_IP_MULTICAST 1126 int reporter; 1127 #endif 1128 1129 if (im->loaded) { 1130 im->loaded = 0; 1131 ip_mc_filter_del(in_dev, im->multiaddr); 1132 } 1133 1134 #ifdef CONFIG_IP_MULTICAST 1135 if (im->multiaddr == IGMP_ALL_HOSTS) 1136 return; 1137 1138 reporter = im->reporter; 1139 igmp_stop_timer(im); 1140 1141 if (!in_dev->dead) { 1142 if (IGMP_V1_SEEN(in_dev)) 1143 goto done; 1144 if (IGMP_V2_SEEN(in_dev)) { 1145 if (reporter) 1146 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1147 goto done; 1148 } 1149 /* IGMPv3 */ 1150 igmpv3_add_delrec(in_dev, im); 1151 1152 igmp_ifc_event(in_dev); 1153 } 1154 done: 1155 #endif 1156 ip_mc_clear_src(im); 1157 } 1158 1159 static void igmp_group_added(struct ip_mc_list *im) 1160 { 1161 struct in_device *in_dev = im->interface; 1162 1163 if (im->loaded == 0) { 1164 im->loaded = 1; 1165 ip_mc_filter_add(in_dev, im->multiaddr); 1166 } 1167 1168 #ifdef CONFIG_IP_MULTICAST 1169 if (im->multiaddr == IGMP_ALL_HOSTS) 1170 return; 1171 1172 if (in_dev->dead) 1173 return; 1174 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1175 spin_lock_bh(&im->lock); 1176 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1177 spin_unlock_bh(&im->lock); 1178 return; 1179 } 1180 /* else, v3 */ 1181 1182 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1183 IGMP_Unsolicited_Report_Count; 1184 igmp_ifc_event(in_dev); 1185 #endif 1186 } 1187 1188 1189 /* 1190 * Multicast list managers 1191 */ 1192 1193 1194 /* 1195 * A socket has joined a multicast group on device dev. 1196 */ 1197 1198 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1199 { 1200 struct ip_mc_list *im; 1201 1202 ASSERT_RTNL(); 1203 1204 for (im=in_dev->mc_list; im; im=im->next) { 1205 if (im->multiaddr == addr) { 1206 im->users++; 1207 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1208 goto out; 1209 } 1210 } 1211 1212 im = kmalloc(sizeof(*im), GFP_KERNEL); 1213 if (!im) 1214 goto out; 1215 1216 im->users=1; 1217 im->interface=in_dev; 1218 in_dev_hold(in_dev); 1219 im->multiaddr=addr; 1220 /* initial mode is (EX, empty) */ 1221 im->sfmode = MCAST_EXCLUDE; 1222 im->sfcount[MCAST_INCLUDE] = 0; 1223 im->sfcount[MCAST_EXCLUDE] = 1; 1224 im->sources = NULL; 1225 im->tomb = NULL; 1226 im->crcount = 0; 1227 atomic_set(&im->refcnt, 1); 1228 spin_lock_init(&im->lock); 1229 #ifdef CONFIG_IP_MULTICAST 1230 im->tm_running=0; 1231 init_timer(&im->timer); 1232 im->timer.data=(unsigned long)im; 1233 im->timer.function=&igmp_timer_expire; 1234 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1235 im->reporter = 0; 1236 im->gsquery = 0; 1237 #endif 1238 im->loaded = 0; 1239 write_lock_bh(&in_dev->mc_list_lock); 1240 im->next=in_dev->mc_list; 1241 in_dev->mc_list=im; 1242 write_unlock_bh(&in_dev->mc_list_lock); 1243 #ifdef CONFIG_IP_MULTICAST 1244 igmpv3_del_delrec(in_dev, im->multiaddr); 1245 #endif 1246 igmp_group_added(im); 1247 if (!in_dev->dead) 1248 ip_rt_multicast_event(in_dev); 1249 out: 1250 return; 1251 } 1252 1253 /* 1254 * A socket has left a multicast group on device dev 1255 */ 1256 1257 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1258 { 1259 struct ip_mc_list *i, **ip; 1260 1261 ASSERT_RTNL(); 1262 1263 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1264 if (i->multiaddr==addr) { 1265 if (--i->users == 0) { 1266 write_lock_bh(&in_dev->mc_list_lock); 1267 *ip = i->next; 1268 write_unlock_bh(&in_dev->mc_list_lock); 1269 igmp_group_dropped(i); 1270 1271 if (!in_dev->dead) 1272 ip_rt_multicast_event(in_dev); 1273 1274 ip_ma_put(i); 1275 return; 1276 } 1277 break; 1278 } 1279 } 1280 } 1281 1282 /* Device going down */ 1283 1284 void ip_mc_down(struct in_device *in_dev) 1285 { 1286 struct ip_mc_list *i; 1287 1288 ASSERT_RTNL(); 1289 1290 for (i=in_dev->mc_list; i; i=i->next) 1291 igmp_group_dropped(i); 1292 1293 #ifdef CONFIG_IP_MULTICAST 1294 in_dev->mr_ifc_count = 0; 1295 if (del_timer(&in_dev->mr_ifc_timer)) 1296 __in_dev_put(in_dev); 1297 in_dev->mr_gq_running = 0; 1298 if (del_timer(&in_dev->mr_gq_timer)) 1299 __in_dev_put(in_dev); 1300 igmpv3_clear_delrec(in_dev); 1301 #endif 1302 1303 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1304 } 1305 1306 void ip_mc_init_dev(struct in_device *in_dev) 1307 { 1308 ASSERT_RTNL(); 1309 1310 in_dev->mc_tomb = NULL; 1311 #ifdef CONFIG_IP_MULTICAST 1312 in_dev->mr_gq_running = 0; 1313 init_timer(&in_dev->mr_gq_timer); 1314 in_dev->mr_gq_timer.data=(unsigned long) in_dev; 1315 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; 1316 in_dev->mr_ifc_count = 0; 1317 init_timer(&in_dev->mr_ifc_timer); 1318 in_dev->mr_ifc_timer.data=(unsigned long) in_dev; 1319 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; 1320 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1321 #endif 1322 1323 rwlock_init(&in_dev->mc_list_lock); 1324 spin_lock_init(&in_dev->mc_tomb_lock); 1325 } 1326 1327 /* Device going up */ 1328 1329 void ip_mc_up(struct in_device *in_dev) 1330 { 1331 struct ip_mc_list *i; 1332 1333 ASSERT_RTNL(); 1334 1335 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1336 1337 for (i=in_dev->mc_list; i; i=i->next) 1338 igmp_group_added(i); 1339 } 1340 1341 /* 1342 * Device is about to be destroyed: clean up. 1343 */ 1344 1345 void ip_mc_destroy_dev(struct in_device *in_dev) 1346 { 1347 struct ip_mc_list *i; 1348 1349 ASSERT_RTNL(); 1350 1351 /* Deactivate timers */ 1352 ip_mc_down(in_dev); 1353 1354 write_lock_bh(&in_dev->mc_list_lock); 1355 while ((i = in_dev->mc_list) != NULL) { 1356 in_dev->mc_list = i->next; 1357 write_unlock_bh(&in_dev->mc_list_lock); 1358 1359 igmp_group_dropped(i); 1360 ip_ma_put(i); 1361 1362 write_lock_bh(&in_dev->mc_list_lock); 1363 } 1364 write_unlock_bh(&in_dev->mc_list_lock); 1365 } 1366 1367 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1368 { 1369 struct flowi fl = { .nl_u = { .ip4_u = 1370 { .daddr = imr->imr_multiaddr.s_addr } } }; 1371 struct rtable *rt; 1372 struct net_device *dev = NULL; 1373 struct in_device *idev = NULL; 1374 1375 if (imr->imr_ifindex) { 1376 idev = inetdev_by_index(imr->imr_ifindex); 1377 if (idev) 1378 __in_dev_put(idev); 1379 return idev; 1380 } 1381 if (imr->imr_address.s_addr) { 1382 dev = ip_dev_find(imr->imr_address.s_addr); 1383 if (!dev) 1384 return NULL; 1385 dev_put(dev); 1386 } 1387 1388 if (!dev && !ip_route_output_key(&rt, &fl)) { 1389 dev = rt->u.dst.dev; 1390 ip_rt_put(rt); 1391 } 1392 if (dev) { 1393 imr->imr_ifindex = dev->ifindex; 1394 idev = __in_dev_get_rtnl(dev); 1395 } 1396 return idev; 1397 } 1398 1399 /* 1400 * Join a socket to a group 1401 */ 1402 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1403 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1404 1405 1406 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1407 __be32 *psfsrc) 1408 { 1409 struct ip_sf_list *psf, *psf_prev; 1410 int rv = 0; 1411 1412 psf_prev = NULL; 1413 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1414 if (psf->sf_inaddr == *psfsrc) 1415 break; 1416 psf_prev = psf; 1417 } 1418 if (!psf || psf->sf_count[sfmode] == 0) { 1419 /* source filter not found, or count wrong => bug */ 1420 return -ESRCH; 1421 } 1422 psf->sf_count[sfmode]--; 1423 if (psf->sf_count[sfmode] == 0) { 1424 ip_rt_multicast_event(pmc->interface); 1425 } 1426 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1427 #ifdef CONFIG_IP_MULTICAST 1428 struct in_device *in_dev = pmc->interface; 1429 #endif 1430 1431 /* no more filters for this source */ 1432 if (psf_prev) 1433 psf_prev->sf_next = psf->sf_next; 1434 else 1435 pmc->sources = psf->sf_next; 1436 #ifdef CONFIG_IP_MULTICAST 1437 if (psf->sf_oldin && 1438 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1439 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1440 IGMP_Unsolicited_Report_Count; 1441 psf->sf_next = pmc->tomb; 1442 pmc->tomb = psf; 1443 rv = 1; 1444 } else 1445 #endif 1446 kfree(psf); 1447 } 1448 return rv; 1449 } 1450 1451 #ifndef CONFIG_IP_MULTICAST 1452 #define igmp_ifc_event(x) do { } while (0) 1453 #endif 1454 1455 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1456 int sfcount, __be32 *psfsrc, int delta) 1457 { 1458 struct ip_mc_list *pmc; 1459 int changerec = 0; 1460 int i, err; 1461 1462 if (!in_dev) 1463 return -ENODEV; 1464 read_lock(&in_dev->mc_list_lock); 1465 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1466 if (*pmca == pmc->multiaddr) 1467 break; 1468 } 1469 if (!pmc) { 1470 /* MCA not found?? bug */ 1471 read_unlock(&in_dev->mc_list_lock); 1472 return -ESRCH; 1473 } 1474 spin_lock_bh(&pmc->lock); 1475 read_unlock(&in_dev->mc_list_lock); 1476 #ifdef CONFIG_IP_MULTICAST 1477 sf_markstate(pmc); 1478 #endif 1479 if (!delta) { 1480 err = -EINVAL; 1481 if (!pmc->sfcount[sfmode]) 1482 goto out_unlock; 1483 pmc->sfcount[sfmode]--; 1484 } 1485 err = 0; 1486 for (i=0; i<sfcount; i++) { 1487 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1488 1489 changerec |= rv > 0; 1490 if (!err && rv < 0) 1491 err = rv; 1492 } 1493 if (pmc->sfmode == MCAST_EXCLUDE && 1494 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1495 pmc->sfcount[MCAST_INCLUDE]) { 1496 #ifdef CONFIG_IP_MULTICAST 1497 struct ip_sf_list *psf; 1498 #endif 1499 1500 /* filter mode change */ 1501 pmc->sfmode = MCAST_INCLUDE; 1502 #ifdef CONFIG_IP_MULTICAST 1503 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1504 IGMP_Unsolicited_Report_Count; 1505 in_dev->mr_ifc_count = pmc->crcount; 1506 for (psf=pmc->sources; psf; psf = psf->sf_next) 1507 psf->sf_crcount = 0; 1508 igmp_ifc_event(pmc->interface); 1509 } else if (sf_setstate(pmc) || changerec) { 1510 igmp_ifc_event(pmc->interface); 1511 #endif 1512 } 1513 out_unlock: 1514 spin_unlock_bh(&pmc->lock); 1515 return err; 1516 } 1517 1518 /* 1519 * Add multicast single-source filter to the interface list 1520 */ 1521 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1522 __be32 *psfsrc, int delta) 1523 { 1524 struct ip_sf_list *psf, *psf_prev; 1525 1526 psf_prev = NULL; 1527 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1528 if (psf->sf_inaddr == *psfsrc) 1529 break; 1530 psf_prev = psf; 1531 } 1532 if (!psf) { 1533 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1534 if (!psf) 1535 return -ENOBUFS; 1536 psf->sf_inaddr = *psfsrc; 1537 if (psf_prev) { 1538 psf_prev->sf_next = psf; 1539 } else 1540 pmc->sources = psf; 1541 } 1542 psf->sf_count[sfmode]++; 1543 if (psf->sf_count[sfmode] == 1) { 1544 ip_rt_multicast_event(pmc->interface); 1545 } 1546 return 0; 1547 } 1548 1549 #ifdef CONFIG_IP_MULTICAST 1550 static void sf_markstate(struct ip_mc_list *pmc) 1551 { 1552 struct ip_sf_list *psf; 1553 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1554 1555 for (psf=pmc->sources; psf; psf=psf->sf_next) 1556 if (pmc->sfcount[MCAST_EXCLUDE]) { 1557 psf->sf_oldin = mca_xcount == 1558 psf->sf_count[MCAST_EXCLUDE] && 1559 !psf->sf_count[MCAST_INCLUDE]; 1560 } else 1561 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1562 } 1563 1564 static int sf_setstate(struct ip_mc_list *pmc) 1565 { 1566 struct ip_sf_list *psf, *dpsf; 1567 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1568 int qrv = pmc->interface->mr_qrv; 1569 int new_in, rv; 1570 1571 rv = 0; 1572 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1573 if (pmc->sfcount[MCAST_EXCLUDE]) { 1574 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1575 !psf->sf_count[MCAST_INCLUDE]; 1576 } else 1577 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1578 if (new_in) { 1579 if (!psf->sf_oldin) { 1580 struct ip_sf_list *prev = NULL; 1581 1582 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1583 if (dpsf->sf_inaddr == psf->sf_inaddr) 1584 break; 1585 prev = dpsf; 1586 } 1587 if (dpsf) { 1588 if (prev) 1589 prev->sf_next = dpsf->sf_next; 1590 else 1591 pmc->tomb = dpsf->sf_next; 1592 kfree(dpsf); 1593 } 1594 psf->sf_crcount = qrv; 1595 rv++; 1596 } 1597 } else if (psf->sf_oldin) { 1598 1599 psf->sf_crcount = 0; 1600 /* 1601 * add or update "delete" records if an active filter 1602 * is now inactive 1603 */ 1604 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1605 if (dpsf->sf_inaddr == psf->sf_inaddr) 1606 break; 1607 if (!dpsf) { 1608 dpsf = (struct ip_sf_list *) 1609 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1610 if (!dpsf) 1611 continue; 1612 *dpsf = *psf; 1613 /* pmc->lock held by callers */ 1614 dpsf->sf_next = pmc->tomb; 1615 pmc->tomb = dpsf; 1616 } 1617 dpsf->sf_crcount = qrv; 1618 rv++; 1619 } 1620 } 1621 return rv; 1622 } 1623 #endif 1624 1625 /* 1626 * Add multicast source filter list to the interface list 1627 */ 1628 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1629 int sfcount, __be32 *psfsrc, int delta) 1630 { 1631 struct ip_mc_list *pmc; 1632 int isexclude; 1633 int i, err; 1634 1635 if (!in_dev) 1636 return -ENODEV; 1637 read_lock(&in_dev->mc_list_lock); 1638 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1639 if (*pmca == pmc->multiaddr) 1640 break; 1641 } 1642 if (!pmc) { 1643 /* MCA not found?? bug */ 1644 read_unlock(&in_dev->mc_list_lock); 1645 return -ESRCH; 1646 } 1647 spin_lock_bh(&pmc->lock); 1648 read_unlock(&in_dev->mc_list_lock); 1649 1650 #ifdef CONFIG_IP_MULTICAST 1651 sf_markstate(pmc); 1652 #endif 1653 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1654 if (!delta) 1655 pmc->sfcount[sfmode]++; 1656 err = 0; 1657 for (i=0; i<sfcount; i++) { 1658 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1659 if (err) 1660 break; 1661 } 1662 if (err) { 1663 int j; 1664 1665 pmc->sfcount[sfmode]--; 1666 for (j=0; j<i; j++) 1667 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1668 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1669 #ifdef CONFIG_IP_MULTICAST 1670 struct in_device *in_dev = pmc->interface; 1671 struct ip_sf_list *psf; 1672 #endif 1673 1674 /* filter mode change */ 1675 if (pmc->sfcount[MCAST_EXCLUDE]) 1676 pmc->sfmode = MCAST_EXCLUDE; 1677 else if (pmc->sfcount[MCAST_INCLUDE]) 1678 pmc->sfmode = MCAST_INCLUDE; 1679 #ifdef CONFIG_IP_MULTICAST 1680 /* else no filters; keep old mode for reports */ 1681 1682 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1683 IGMP_Unsolicited_Report_Count; 1684 in_dev->mr_ifc_count = pmc->crcount; 1685 for (psf=pmc->sources; psf; psf = psf->sf_next) 1686 psf->sf_crcount = 0; 1687 igmp_ifc_event(in_dev); 1688 } else if (sf_setstate(pmc)) { 1689 igmp_ifc_event(in_dev); 1690 #endif 1691 } 1692 spin_unlock_bh(&pmc->lock); 1693 return err; 1694 } 1695 1696 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1697 { 1698 struct ip_sf_list *psf, *nextpsf; 1699 1700 for (psf=pmc->tomb; psf; psf=nextpsf) { 1701 nextpsf = psf->sf_next; 1702 kfree(psf); 1703 } 1704 pmc->tomb = NULL; 1705 for (psf=pmc->sources; psf; psf=nextpsf) { 1706 nextpsf = psf->sf_next; 1707 kfree(psf); 1708 } 1709 pmc->sources = NULL; 1710 pmc->sfmode = MCAST_EXCLUDE; 1711 pmc->sfcount[MCAST_INCLUDE] = 0; 1712 pmc->sfcount[MCAST_EXCLUDE] = 1; 1713 } 1714 1715 1716 /* 1717 * Join a multicast group 1718 */ 1719 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1720 { 1721 int err; 1722 __be32 addr = imr->imr_multiaddr.s_addr; 1723 struct ip_mc_socklist *iml=NULL, *i; 1724 struct in_device *in_dev; 1725 struct inet_sock *inet = inet_sk(sk); 1726 int ifindex; 1727 int count = 0; 1728 1729 if (!MULTICAST(addr)) 1730 return -EINVAL; 1731 1732 rtnl_lock(); 1733 1734 in_dev = ip_mc_find_dev(imr); 1735 1736 if (!in_dev) { 1737 iml = NULL; 1738 err = -ENODEV; 1739 goto done; 1740 } 1741 1742 err = -EADDRINUSE; 1743 ifindex = imr->imr_ifindex; 1744 for (i = inet->mc_list; i; i = i->next) { 1745 if (i->multi.imr_multiaddr.s_addr == addr && 1746 i->multi.imr_ifindex == ifindex) 1747 goto done; 1748 count++; 1749 } 1750 err = -ENOBUFS; 1751 if (count >= sysctl_igmp_max_memberships) 1752 goto done; 1753 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1754 if (iml == NULL) 1755 goto done; 1756 1757 memcpy(&iml->multi, imr, sizeof(*imr)); 1758 iml->next = inet->mc_list; 1759 iml->sflist = NULL; 1760 iml->sfmode = MCAST_EXCLUDE; 1761 inet->mc_list = iml; 1762 ip_mc_inc_group(in_dev, addr); 1763 err = 0; 1764 done: 1765 rtnl_unlock(); 1766 return err; 1767 } 1768 1769 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1770 struct in_device *in_dev) 1771 { 1772 int err; 1773 1774 if (iml->sflist == 0) { 1775 /* any-source empty exclude case */ 1776 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1777 iml->sfmode, 0, NULL, 0); 1778 } 1779 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1780 iml->sfmode, iml->sflist->sl_count, 1781 iml->sflist->sl_addr, 0); 1782 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1783 iml->sflist = NULL; 1784 return err; 1785 } 1786 1787 /* 1788 * Ask a socket to leave a group. 1789 */ 1790 1791 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1792 { 1793 struct inet_sock *inet = inet_sk(sk); 1794 struct ip_mc_socklist *iml, **imlp; 1795 struct in_device *in_dev; 1796 __be32 group = imr->imr_multiaddr.s_addr; 1797 u32 ifindex; 1798 int ret = -EADDRNOTAVAIL; 1799 1800 rtnl_lock(); 1801 in_dev = ip_mc_find_dev(imr); 1802 ifindex = imr->imr_ifindex; 1803 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1804 if (iml->multi.imr_multiaddr.s_addr != group) 1805 continue; 1806 if (ifindex) { 1807 if (iml->multi.imr_ifindex != ifindex) 1808 continue; 1809 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1810 iml->multi.imr_address.s_addr) 1811 continue; 1812 1813 (void) ip_mc_leave_src(sk, iml, in_dev); 1814 1815 *imlp = iml->next; 1816 1817 if (in_dev) 1818 ip_mc_dec_group(in_dev, group); 1819 rtnl_unlock(); 1820 sock_kfree_s(sk, iml, sizeof(*iml)); 1821 return 0; 1822 } 1823 if (!in_dev) 1824 ret = -ENODEV; 1825 rtnl_unlock(); 1826 return ret; 1827 } 1828 1829 int ip_mc_source(int add, int omode, struct sock *sk, struct 1830 ip_mreq_source *mreqs, int ifindex) 1831 { 1832 int err; 1833 struct ip_mreqn imr; 1834 __be32 addr = mreqs->imr_multiaddr; 1835 struct ip_mc_socklist *pmc; 1836 struct in_device *in_dev = NULL; 1837 struct inet_sock *inet = inet_sk(sk); 1838 struct ip_sf_socklist *psl; 1839 int leavegroup = 0; 1840 int i, j, rv; 1841 1842 if (!MULTICAST(addr)) 1843 return -EINVAL; 1844 1845 rtnl_lock(); 1846 1847 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1848 imr.imr_address.s_addr = mreqs->imr_interface; 1849 imr.imr_ifindex = ifindex; 1850 in_dev = ip_mc_find_dev(&imr); 1851 1852 if (!in_dev) { 1853 err = -ENODEV; 1854 goto done; 1855 } 1856 err = -EADDRNOTAVAIL; 1857 1858 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1859 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1860 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1861 break; 1862 } 1863 if (!pmc) { /* must have a prior join */ 1864 err = -EINVAL; 1865 goto done; 1866 } 1867 /* if a source filter was set, must be the same mode as before */ 1868 if (pmc->sflist) { 1869 if (pmc->sfmode != omode) { 1870 err = -EINVAL; 1871 goto done; 1872 } 1873 } else if (pmc->sfmode != omode) { 1874 /* allow mode switches for empty-set filters */ 1875 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1876 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1877 NULL, 0); 1878 pmc->sfmode = omode; 1879 } 1880 1881 psl = pmc->sflist; 1882 if (!add) { 1883 if (!psl) 1884 goto done; /* err = -EADDRNOTAVAIL */ 1885 rv = !0; 1886 for (i=0; i<psl->sl_count; i++) { 1887 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1888 sizeof(__be32)); 1889 if (rv == 0) 1890 break; 1891 } 1892 if (rv) /* source not found */ 1893 goto done; /* err = -EADDRNOTAVAIL */ 1894 1895 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1896 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1897 leavegroup = 1; 1898 goto done; 1899 } 1900 1901 /* update the interface filter */ 1902 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1903 &mreqs->imr_sourceaddr, 1); 1904 1905 for (j=i+1; j<psl->sl_count; j++) 1906 psl->sl_addr[j-1] = psl->sl_addr[j]; 1907 psl->sl_count--; 1908 err = 0; 1909 goto done; 1910 } 1911 /* else, add a new source to the filter */ 1912 1913 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1914 err = -ENOBUFS; 1915 goto done; 1916 } 1917 if (!psl || psl->sl_count == psl->sl_max) { 1918 struct ip_sf_socklist *newpsl; 1919 int count = IP_SFBLOCK; 1920 1921 if (psl) 1922 count += psl->sl_max; 1923 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1924 if (!newpsl) { 1925 err = -ENOBUFS; 1926 goto done; 1927 } 1928 newpsl->sl_max = count; 1929 newpsl->sl_count = count - IP_SFBLOCK; 1930 if (psl) { 1931 for (i=0; i<psl->sl_count; i++) 1932 newpsl->sl_addr[i] = psl->sl_addr[i]; 1933 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1934 } 1935 pmc->sflist = psl = newpsl; 1936 } 1937 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1938 for (i=0; i<psl->sl_count; i++) { 1939 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1940 sizeof(__be32)); 1941 if (rv == 0) 1942 break; 1943 } 1944 if (rv == 0) /* address already there is an error */ 1945 goto done; 1946 for (j=psl->sl_count-1; j>=i; j--) 1947 psl->sl_addr[j+1] = psl->sl_addr[j]; 1948 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1949 psl->sl_count++; 1950 err = 0; 1951 /* update the interface list */ 1952 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1953 &mreqs->imr_sourceaddr, 1); 1954 done: 1955 rtnl_unlock(); 1956 if (leavegroup) 1957 return ip_mc_leave_group(sk, &imr); 1958 return err; 1959 } 1960 1961 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1962 { 1963 int err = 0; 1964 struct ip_mreqn imr; 1965 __be32 addr = msf->imsf_multiaddr; 1966 struct ip_mc_socklist *pmc; 1967 struct in_device *in_dev; 1968 struct inet_sock *inet = inet_sk(sk); 1969 struct ip_sf_socklist *newpsl, *psl; 1970 int leavegroup = 0; 1971 1972 if (!MULTICAST(addr)) 1973 return -EINVAL; 1974 if (msf->imsf_fmode != MCAST_INCLUDE && 1975 msf->imsf_fmode != MCAST_EXCLUDE) 1976 return -EINVAL; 1977 1978 rtnl_lock(); 1979 1980 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 1981 imr.imr_address.s_addr = msf->imsf_interface; 1982 imr.imr_ifindex = ifindex; 1983 in_dev = ip_mc_find_dev(&imr); 1984 1985 if (!in_dev) { 1986 err = -ENODEV; 1987 goto done; 1988 } 1989 1990 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1991 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 1992 leavegroup = 1; 1993 goto done; 1994 } 1995 1996 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1997 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 1998 pmc->multi.imr_ifindex == imr.imr_ifindex) 1999 break; 2000 } 2001 if (!pmc) { /* must have a prior join */ 2002 err = -EINVAL; 2003 goto done; 2004 } 2005 if (msf->imsf_numsrc) { 2006 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2007 GFP_KERNEL); 2008 if (!newpsl) { 2009 err = -ENOBUFS; 2010 goto done; 2011 } 2012 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2013 memcpy(newpsl->sl_addr, msf->imsf_slist, 2014 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2015 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2016 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2017 if (err) { 2018 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2019 goto done; 2020 } 2021 } else { 2022 newpsl = NULL; 2023 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2024 msf->imsf_fmode, 0, NULL, 0); 2025 } 2026 psl = pmc->sflist; 2027 if (psl) { 2028 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2029 psl->sl_count, psl->sl_addr, 0); 2030 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2031 } else 2032 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2033 0, NULL, 0); 2034 pmc->sflist = newpsl; 2035 pmc->sfmode = msf->imsf_fmode; 2036 err = 0; 2037 done: 2038 rtnl_unlock(); 2039 if (leavegroup) 2040 err = ip_mc_leave_group(sk, &imr); 2041 return err; 2042 } 2043 2044 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2045 struct ip_msfilter __user *optval, int __user *optlen) 2046 { 2047 int err, len, count, copycount; 2048 struct ip_mreqn imr; 2049 __be32 addr = msf->imsf_multiaddr; 2050 struct ip_mc_socklist *pmc; 2051 struct in_device *in_dev; 2052 struct inet_sock *inet = inet_sk(sk); 2053 struct ip_sf_socklist *psl; 2054 2055 if (!MULTICAST(addr)) 2056 return -EINVAL; 2057 2058 rtnl_lock(); 2059 2060 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2061 imr.imr_address.s_addr = msf->imsf_interface; 2062 imr.imr_ifindex = 0; 2063 in_dev = ip_mc_find_dev(&imr); 2064 2065 if (!in_dev) { 2066 err = -ENODEV; 2067 goto done; 2068 } 2069 err = -EADDRNOTAVAIL; 2070 2071 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2072 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2073 pmc->multi.imr_ifindex == imr.imr_ifindex) 2074 break; 2075 } 2076 if (!pmc) /* must have a prior join */ 2077 goto done; 2078 msf->imsf_fmode = pmc->sfmode; 2079 psl = pmc->sflist; 2080 rtnl_unlock(); 2081 if (!psl) { 2082 len = 0; 2083 count = 0; 2084 } else { 2085 count = psl->sl_count; 2086 } 2087 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2088 len = copycount * sizeof(psl->sl_addr[0]); 2089 msf->imsf_numsrc = count; 2090 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2091 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2092 return -EFAULT; 2093 } 2094 if (len && 2095 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2096 return -EFAULT; 2097 return 0; 2098 done: 2099 rtnl_unlock(); 2100 return err; 2101 } 2102 2103 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2104 struct group_filter __user *optval, int __user *optlen) 2105 { 2106 int err, i, count, copycount; 2107 struct sockaddr_in *psin; 2108 __be32 addr; 2109 struct ip_mc_socklist *pmc; 2110 struct inet_sock *inet = inet_sk(sk); 2111 struct ip_sf_socklist *psl; 2112 2113 psin = (struct sockaddr_in *)&gsf->gf_group; 2114 if (psin->sin_family != AF_INET) 2115 return -EINVAL; 2116 addr = psin->sin_addr.s_addr; 2117 if (!MULTICAST(addr)) 2118 return -EINVAL; 2119 2120 rtnl_lock(); 2121 2122 err = -EADDRNOTAVAIL; 2123 2124 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2125 if (pmc->multi.imr_multiaddr.s_addr == addr && 2126 pmc->multi.imr_ifindex == gsf->gf_interface) 2127 break; 2128 } 2129 if (!pmc) /* must have a prior join */ 2130 goto done; 2131 gsf->gf_fmode = pmc->sfmode; 2132 psl = pmc->sflist; 2133 rtnl_unlock(); 2134 count = psl ? psl->sl_count : 0; 2135 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2136 gsf->gf_numsrc = count; 2137 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2138 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2139 return -EFAULT; 2140 } 2141 for (i=0; i<copycount; i++) { 2142 struct sockaddr_in *psin; 2143 struct sockaddr_storage ss; 2144 2145 psin = (struct sockaddr_in *)&ss; 2146 memset(&ss, 0, sizeof(ss)); 2147 psin->sin_family = AF_INET; 2148 psin->sin_addr.s_addr = psl->sl_addr[i]; 2149 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2150 return -EFAULT; 2151 } 2152 return 0; 2153 done: 2154 rtnl_unlock(); 2155 return err; 2156 } 2157 2158 /* 2159 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2160 */ 2161 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2162 { 2163 struct inet_sock *inet = inet_sk(sk); 2164 struct ip_mc_socklist *pmc; 2165 struct ip_sf_socklist *psl; 2166 int i; 2167 2168 if (!MULTICAST(loc_addr)) 2169 return 1; 2170 2171 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2172 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2173 pmc->multi.imr_ifindex == dif) 2174 break; 2175 } 2176 if (!pmc) 2177 return 1; 2178 psl = pmc->sflist; 2179 if (!psl) 2180 return pmc->sfmode == MCAST_EXCLUDE; 2181 2182 for (i=0; i<psl->sl_count; i++) { 2183 if (psl->sl_addr[i] == rmt_addr) 2184 break; 2185 } 2186 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2187 return 0; 2188 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2189 return 0; 2190 return 1; 2191 } 2192 2193 /* 2194 * A socket is closing. 2195 */ 2196 2197 void ip_mc_drop_socket(struct sock *sk) 2198 { 2199 struct inet_sock *inet = inet_sk(sk); 2200 struct ip_mc_socklist *iml; 2201 2202 if (inet->mc_list == NULL) 2203 return; 2204 2205 rtnl_lock(); 2206 while ((iml = inet->mc_list) != NULL) { 2207 struct in_device *in_dev; 2208 inet->mc_list = iml->next; 2209 2210 in_dev = inetdev_by_index(iml->multi.imr_ifindex); 2211 (void) ip_mc_leave_src(sk, iml, in_dev); 2212 if (in_dev != NULL) { 2213 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2214 in_dev_put(in_dev); 2215 } 2216 sock_kfree_s(sk, iml, sizeof(*iml)); 2217 } 2218 rtnl_unlock(); 2219 } 2220 2221 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2222 { 2223 struct ip_mc_list *im; 2224 struct ip_sf_list *psf; 2225 int rv = 0; 2226 2227 read_lock(&in_dev->mc_list_lock); 2228 for (im=in_dev->mc_list; im; im=im->next) { 2229 if (im->multiaddr == mc_addr) 2230 break; 2231 } 2232 if (im && proto == IPPROTO_IGMP) { 2233 rv = 1; 2234 } else if (im) { 2235 if (src_addr) { 2236 for (psf=im->sources; psf; psf=psf->sf_next) { 2237 if (psf->sf_inaddr == src_addr) 2238 break; 2239 } 2240 if (psf) 2241 rv = psf->sf_count[MCAST_INCLUDE] || 2242 psf->sf_count[MCAST_EXCLUDE] != 2243 im->sfcount[MCAST_EXCLUDE]; 2244 else 2245 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2246 } else 2247 rv = 1; /* unspecified source; tentatively allow */ 2248 } 2249 read_unlock(&in_dev->mc_list_lock); 2250 return rv; 2251 } 2252 2253 #if defined(CONFIG_PROC_FS) 2254 struct igmp_mc_iter_state { 2255 struct net_device *dev; 2256 struct in_device *in_dev; 2257 }; 2258 2259 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2260 2261 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2262 { 2263 struct ip_mc_list *im = NULL; 2264 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2265 2266 for (state->dev = dev_base, state->in_dev = NULL; 2267 state->dev; 2268 state->dev = state->dev->next) { 2269 struct in_device *in_dev; 2270 in_dev = in_dev_get(state->dev); 2271 if (!in_dev) 2272 continue; 2273 read_lock(&in_dev->mc_list_lock); 2274 im = in_dev->mc_list; 2275 if (im) { 2276 state->in_dev = in_dev; 2277 break; 2278 } 2279 read_unlock(&in_dev->mc_list_lock); 2280 in_dev_put(in_dev); 2281 } 2282 return im; 2283 } 2284 2285 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2286 { 2287 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2288 im = im->next; 2289 while (!im) { 2290 if (likely(state->in_dev != NULL)) { 2291 read_unlock(&state->in_dev->mc_list_lock); 2292 in_dev_put(state->in_dev); 2293 } 2294 state->dev = state->dev->next; 2295 if (!state->dev) { 2296 state->in_dev = NULL; 2297 break; 2298 } 2299 state->in_dev = in_dev_get(state->dev); 2300 if (!state->in_dev) 2301 continue; 2302 read_lock(&state->in_dev->mc_list_lock); 2303 im = state->in_dev->mc_list; 2304 } 2305 return im; 2306 } 2307 2308 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2309 { 2310 struct ip_mc_list *im = igmp_mc_get_first(seq); 2311 if (im) 2312 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2313 --pos; 2314 return pos ? NULL : im; 2315 } 2316 2317 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2318 { 2319 read_lock(&dev_base_lock); 2320 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2321 } 2322 2323 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2324 { 2325 struct ip_mc_list *im; 2326 if (v == SEQ_START_TOKEN) 2327 im = igmp_mc_get_first(seq); 2328 else 2329 im = igmp_mc_get_next(seq, v); 2330 ++*pos; 2331 return im; 2332 } 2333 2334 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2335 { 2336 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2337 if (likely(state->in_dev != NULL)) { 2338 read_unlock(&state->in_dev->mc_list_lock); 2339 in_dev_put(state->in_dev); 2340 state->in_dev = NULL; 2341 } 2342 state->dev = NULL; 2343 read_unlock(&dev_base_lock); 2344 } 2345 2346 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2347 { 2348 if (v == SEQ_START_TOKEN) 2349 seq_puts(seq, 2350 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2351 else { 2352 struct ip_mc_list *im = (struct ip_mc_list *)v; 2353 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2354 char *querier; 2355 #ifdef CONFIG_IP_MULTICAST 2356 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2357 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2358 "V3"; 2359 #else 2360 querier = "NONE"; 2361 #endif 2362 2363 if (state->in_dev->mc_list == im) { 2364 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2365 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2366 } 2367 2368 seq_printf(seq, 2369 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2370 im->multiaddr, im->users, 2371 im->tm_running, im->tm_running ? 2372 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2373 im->reporter); 2374 } 2375 return 0; 2376 } 2377 2378 static struct seq_operations igmp_mc_seq_ops = { 2379 .start = igmp_mc_seq_start, 2380 .next = igmp_mc_seq_next, 2381 .stop = igmp_mc_seq_stop, 2382 .show = igmp_mc_seq_show, 2383 }; 2384 2385 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2386 { 2387 struct seq_file *seq; 2388 int rc = -ENOMEM; 2389 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2390 2391 if (!s) 2392 goto out; 2393 rc = seq_open(file, &igmp_mc_seq_ops); 2394 if (rc) 2395 goto out_kfree; 2396 2397 seq = file->private_data; 2398 seq->private = s; 2399 out: 2400 return rc; 2401 out_kfree: 2402 kfree(s); 2403 goto out; 2404 } 2405 2406 static const struct file_operations igmp_mc_seq_fops = { 2407 .owner = THIS_MODULE, 2408 .open = igmp_mc_seq_open, 2409 .read = seq_read, 2410 .llseek = seq_lseek, 2411 .release = seq_release_private, 2412 }; 2413 2414 struct igmp_mcf_iter_state { 2415 struct net_device *dev; 2416 struct in_device *idev; 2417 struct ip_mc_list *im; 2418 }; 2419 2420 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2421 2422 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2423 { 2424 struct ip_sf_list *psf = NULL; 2425 struct ip_mc_list *im = NULL; 2426 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2427 2428 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2429 state->dev; 2430 state->dev = state->dev->next) { 2431 struct in_device *idev; 2432 idev = in_dev_get(state->dev); 2433 if (unlikely(idev == NULL)) 2434 continue; 2435 read_lock(&idev->mc_list_lock); 2436 im = idev->mc_list; 2437 if (likely(im != NULL)) { 2438 spin_lock_bh(&im->lock); 2439 psf = im->sources; 2440 if (likely(psf != NULL)) { 2441 state->im = im; 2442 state->idev = idev; 2443 break; 2444 } 2445 spin_unlock_bh(&im->lock); 2446 } 2447 read_unlock(&idev->mc_list_lock); 2448 in_dev_put(idev); 2449 } 2450 return psf; 2451 } 2452 2453 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2454 { 2455 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2456 2457 psf = psf->sf_next; 2458 while (!psf) { 2459 spin_unlock_bh(&state->im->lock); 2460 state->im = state->im->next; 2461 while (!state->im) { 2462 if (likely(state->idev != NULL)) { 2463 read_unlock(&state->idev->mc_list_lock); 2464 in_dev_put(state->idev); 2465 } 2466 state->dev = state->dev->next; 2467 if (!state->dev) { 2468 state->idev = NULL; 2469 goto out; 2470 } 2471 state->idev = in_dev_get(state->dev); 2472 if (!state->idev) 2473 continue; 2474 read_lock(&state->idev->mc_list_lock); 2475 state->im = state->idev->mc_list; 2476 } 2477 if (!state->im) 2478 break; 2479 spin_lock_bh(&state->im->lock); 2480 psf = state->im->sources; 2481 } 2482 out: 2483 return psf; 2484 } 2485 2486 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2487 { 2488 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2489 if (psf) 2490 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2491 --pos; 2492 return pos ? NULL : psf; 2493 } 2494 2495 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2496 { 2497 read_lock(&dev_base_lock); 2498 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2499 } 2500 2501 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2502 { 2503 struct ip_sf_list *psf; 2504 if (v == SEQ_START_TOKEN) 2505 psf = igmp_mcf_get_first(seq); 2506 else 2507 psf = igmp_mcf_get_next(seq, v); 2508 ++*pos; 2509 return psf; 2510 } 2511 2512 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2513 { 2514 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2515 if (likely(state->im != NULL)) { 2516 spin_unlock_bh(&state->im->lock); 2517 state->im = NULL; 2518 } 2519 if (likely(state->idev != NULL)) { 2520 read_unlock(&state->idev->mc_list_lock); 2521 in_dev_put(state->idev); 2522 state->idev = NULL; 2523 } 2524 state->dev = NULL; 2525 read_unlock(&dev_base_lock); 2526 } 2527 2528 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2529 { 2530 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2531 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2532 2533 if (v == SEQ_START_TOKEN) { 2534 seq_printf(seq, 2535 "%3s %6s " 2536 "%10s %10s %6s %6s\n", "Idx", 2537 "Device", "MCA", 2538 "SRC", "INC", "EXC"); 2539 } else { 2540 seq_printf(seq, 2541 "%3d %6.6s 0x%08x " 2542 "0x%08x %6lu %6lu\n", 2543 state->dev->ifindex, state->dev->name, 2544 ntohl(state->im->multiaddr), 2545 ntohl(psf->sf_inaddr), 2546 psf->sf_count[MCAST_INCLUDE], 2547 psf->sf_count[MCAST_EXCLUDE]); 2548 } 2549 return 0; 2550 } 2551 2552 static struct seq_operations igmp_mcf_seq_ops = { 2553 .start = igmp_mcf_seq_start, 2554 .next = igmp_mcf_seq_next, 2555 .stop = igmp_mcf_seq_stop, 2556 .show = igmp_mcf_seq_show, 2557 }; 2558 2559 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2560 { 2561 struct seq_file *seq; 2562 int rc = -ENOMEM; 2563 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2564 2565 if (!s) 2566 goto out; 2567 rc = seq_open(file, &igmp_mcf_seq_ops); 2568 if (rc) 2569 goto out_kfree; 2570 2571 seq = file->private_data; 2572 seq->private = s; 2573 out: 2574 return rc; 2575 out_kfree: 2576 kfree(s); 2577 goto out; 2578 } 2579 2580 static const struct file_operations igmp_mcf_seq_fops = { 2581 .owner = THIS_MODULE, 2582 .open = igmp_mcf_seq_open, 2583 .read = seq_read, 2584 .llseek = seq_lseek, 2585 .release = seq_release_private, 2586 }; 2587 2588 int __init igmp_mc_proc_init(void) 2589 { 2590 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); 2591 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2592 return 0; 2593 } 2594 #endif 2595 2596 EXPORT_SYMBOL(ip_mc_dec_group); 2597 EXPORT_SYMBOL(ip_mc_inc_group); 2598 EXPORT_SYMBOL(ip_mc_join_group); 2599