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/config.h> 76 #include <linux/module.h> 77 #include <asm/uaccess.h> 78 #include <asm/system.h> 79 #include <linux/types.h> 80 #include <linux/kernel.h> 81 #include <linux/jiffies.h> 82 #include <linux/string.h> 83 #include <linux/socket.h> 84 #include <linux/sockios.h> 85 #include <linux/in.h> 86 #include <linux/inet.h> 87 #include <linux/netdevice.h> 88 #include <linux/skbuff.h> 89 #include <linux/inetdevice.h> 90 #include <linux/igmp.h> 91 #include <linux/if_arp.h> 92 #include <linux/rtnetlink.h> 93 #include <linux/times.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) (ipv4_devconf.force_igmp_version == 1 || \ 131 (in_dev)->cnf.force_igmp_version == 1 || \ 132 ((in_dev)->mr_v1_seen && \ 133 time_before(jiffies, (in_dev)->mr_v1_seen))) 134 #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \ 135 (in_dev)->cnf.force_igmp_version == 2 || \ 136 ((in_dev)->mr_v2_seen && \ 137 time_before(jiffies, (in_dev)->mr_v2_seen))) 138 139 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 140 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr); 141 static void igmpv3_clear_delrec(struct in_device *in_dev); 142 static int sf_setstate(struct ip_mc_list *pmc); 143 static void sf_markstate(struct ip_mc_list *pmc); 144 #endif 145 static void ip_mc_clear_src(struct ip_mc_list *pmc); 146 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 147 int sfcount, __u32 *psfsrc, int delta); 148 149 static void ip_ma_put(struct ip_mc_list *im) 150 { 151 if (atomic_dec_and_test(&im->refcnt)) { 152 in_dev_put(im->interface); 153 kfree(im); 154 } 155 } 156 157 #ifdef CONFIG_IP_MULTICAST 158 159 /* 160 * Timer management 161 */ 162 163 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 164 { 165 spin_lock_bh(&im->lock); 166 if (del_timer(&im->timer)) 167 atomic_dec(&im->refcnt); 168 im->tm_running=0; 169 im->reporter = 0; 170 im->unsolicit_count = 0; 171 spin_unlock_bh(&im->lock); 172 } 173 174 /* It must be called with locked im->lock */ 175 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 176 { 177 int tv=net_random() % max_delay; 178 179 im->tm_running=1; 180 if (!mod_timer(&im->timer, jiffies+tv+2)) 181 atomic_inc(&im->refcnt); 182 } 183 184 static void igmp_gq_start_timer(struct in_device *in_dev) 185 { 186 int tv = net_random() % in_dev->mr_maxdelay; 187 188 in_dev->mr_gq_running = 1; 189 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 190 in_dev_hold(in_dev); 191 } 192 193 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 194 { 195 int tv = net_random() % delay; 196 197 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 198 in_dev_hold(in_dev); 199 } 200 201 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 202 { 203 spin_lock_bh(&im->lock); 204 im->unsolicit_count = 0; 205 if (del_timer(&im->timer)) { 206 if ((long)(im->timer.expires-jiffies) < max_delay) { 207 add_timer(&im->timer); 208 im->tm_running=1; 209 spin_unlock_bh(&im->lock); 210 return; 211 } 212 atomic_dec(&im->refcnt); 213 } 214 igmp_start_timer(im, max_delay); 215 spin_unlock_bh(&im->lock); 216 } 217 218 219 /* 220 * Send an IGMP report. 221 */ 222 223 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 224 225 226 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 227 int gdeleted, int sdeleted) 228 { 229 switch (type) { 230 case IGMPV3_MODE_IS_INCLUDE: 231 case IGMPV3_MODE_IS_EXCLUDE: 232 if (gdeleted || sdeleted) 233 return 0; 234 return !(pmc->gsquery && !psf->sf_gsresp); 235 case IGMPV3_CHANGE_TO_INCLUDE: 236 if (gdeleted || sdeleted) 237 return 0; 238 return psf->sf_count[MCAST_INCLUDE] != 0; 239 case IGMPV3_CHANGE_TO_EXCLUDE: 240 if (gdeleted || sdeleted) 241 return 0; 242 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 243 psf->sf_count[MCAST_INCLUDE]) 244 return 0; 245 return pmc->sfcount[MCAST_EXCLUDE] == 246 psf->sf_count[MCAST_EXCLUDE]; 247 case IGMPV3_ALLOW_NEW_SOURCES: 248 if (gdeleted || !psf->sf_crcount) 249 return 0; 250 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 251 case IGMPV3_BLOCK_OLD_SOURCES: 252 if (pmc->sfmode == MCAST_INCLUDE) 253 return gdeleted || (psf->sf_crcount && sdeleted); 254 return psf->sf_crcount && !gdeleted && !sdeleted; 255 } 256 return 0; 257 } 258 259 static int 260 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 261 { 262 struct ip_sf_list *psf; 263 int scount = 0; 264 265 for (psf=pmc->sources; psf; psf=psf->sf_next) { 266 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 267 continue; 268 scount++; 269 } 270 return scount; 271 } 272 273 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 274 { 275 struct sk_buff *skb; 276 struct rtable *rt; 277 struct iphdr *pip; 278 struct igmpv3_report *pig; 279 280 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); 281 if (skb == NULL) 282 return NULL; 283 284 { 285 struct flowi fl = { .oif = dev->ifindex, 286 .nl_u = { .ip4_u = { 287 .daddr = IGMPV3_ALL_MCR } }, 288 .proto = IPPROTO_IGMP }; 289 if (ip_route_output_key(&rt, &fl)) { 290 kfree_skb(skb); 291 return NULL; 292 } 293 } 294 if (rt->rt_src == 0) { 295 kfree_skb(skb); 296 ip_rt_put(rt); 297 return NULL; 298 } 299 300 skb->dst = &rt->u.dst; 301 skb->dev = dev; 302 303 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 304 305 skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); 306 307 pip->version = 4; 308 pip->ihl = (sizeof(struct iphdr)+4)>>2; 309 pip->tos = 0xc0; 310 pip->frag_off = htons(IP_DF); 311 pip->ttl = 1; 312 pip->daddr = rt->rt_dst; 313 pip->saddr = rt->rt_src; 314 pip->protocol = IPPROTO_IGMP; 315 pip->tot_len = 0; /* filled in later */ 316 ip_select_ident(pip, &rt->u.dst, NULL); 317 ((u8*)&pip[1])[0] = IPOPT_RA; 318 ((u8*)&pip[1])[1] = 4; 319 ((u8*)&pip[1])[2] = 0; 320 ((u8*)&pip[1])[3] = 0; 321 322 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); 323 skb->h.igmph = (struct igmphdr *)pig; 324 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 325 pig->resv1 = 0; 326 pig->csum = 0; 327 pig->resv2 = 0; 328 pig->ngrec = 0; 329 return skb; 330 } 331 332 static int igmpv3_sendpack(struct sk_buff *skb) 333 { 334 struct iphdr *pip = skb->nh.iph; 335 struct igmphdr *pig = skb->h.igmph; 336 int iplen, igmplen; 337 338 iplen = skb->tail - (unsigned char *)skb->nh.iph; 339 pip->tot_len = htons(iplen); 340 ip_send_check(pip); 341 342 igmplen = skb->tail - (unsigned char *)skb->h.igmph; 343 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); 344 345 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, 346 dst_output); 347 } 348 349 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 350 { 351 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 352 } 353 354 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 355 int type, struct igmpv3_grec **ppgr) 356 { 357 struct net_device *dev = pmc->interface->dev; 358 struct igmpv3_report *pih; 359 struct igmpv3_grec *pgr; 360 361 if (!skb) 362 skb = igmpv3_newpack(dev, dev->mtu); 363 if (!skb) 364 return NULL; 365 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 366 pgr->grec_type = type; 367 pgr->grec_auxwords = 0; 368 pgr->grec_nsrcs = 0; 369 pgr->grec_mca = pmc->multiaddr; 370 pih = (struct igmpv3_report *)skb->h.igmph; 371 pih->ngrec = htons(ntohs(pih->ngrec)+1); 372 *ppgr = pgr; 373 return skb; 374 } 375 376 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 377 skb_tailroom(skb)) : 0) 378 379 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 380 int type, int gdeleted, int sdeleted) 381 { 382 struct net_device *dev = pmc->interface->dev; 383 struct igmpv3_report *pih; 384 struct igmpv3_grec *pgr = NULL; 385 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 386 int scount, first, isquery, truncate; 387 388 if (pmc->multiaddr == IGMP_ALL_HOSTS) 389 return skb; 390 391 isquery = type == IGMPV3_MODE_IS_INCLUDE || 392 type == IGMPV3_MODE_IS_EXCLUDE; 393 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 394 type == IGMPV3_CHANGE_TO_EXCLUDE; 395 396 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 397 398 if (!*psf_list) { 399 if (type == IGMPV3_ALLOW_NEW_SOURCES || 400 type == IGMPV3_BLOCK_OLD_SOURCES) 401 return skb; 402 if (pmc->crcount || isquery) { 403 /* make sure we have room for group header and at 404 * least one source. 405 */ 406 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+ 407 sizeof(__u32)) { 408 igmpv3_sendpack(skb); 409 skb = NULL; /* add_grhead will get a new one */ 410 } 411 skb = add_grhead(skb, pmc, type, &pgr); 412 } 413 return skb; 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 scount = 0; 428 psf_prev = NULL; 429 for (psf=*psf_list; psf; psf=psf_next) { 430 u32 *psrc; 431 432 psf_next = psf->sf_next; 433 434 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 435 psf_prev = psf; 436 continue; 437 } 438 439 /* clear marks on query responses */ 440 if (isquery) 441 psf->sf_gsresp = 0; 442 443 if (AVAILABLE(skb) < sizeof(u32) + 444 first*sizeof(struct igmpv3_grec)) { 445 if (truncate && !first) 446 break; /* truncate these */ 447 if (pgr) 448 pgr->grec_nsrcs = htons(scount); 449 if (skb) 450 igmpv3_sendpack(skb); 451 skb = igmpv3_newpack(dev, dev->mtu); 452 first = 1; 453 scount = 0; 454 } 455 if (first) { 456 skb = add_grhead(skb, pmc, type, &pgr); 457 first = 0; 458 } 459 psrc = (u32 *)skb_put(skb, sizeof(u32)); 460 *psrc = psf->sf_inaddr; 461 scount++; 462 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 464 psf->sf_crcount--; 465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 466 if (psf_prev) 467 psf_prev->sf_next = psf->sf_next; 468 else 469 *psf_list = psf->sf_next; 470 kfree(psf); 471 continue; 472 } 473 } 474 psf_prev = psf; 475 } 476 if (pgr) 477 pgr->grec_nsrcs = htons(scount); 478 479 if (isquery) 480 pmc->gsquery = 0; /* clear query state on report */ 481 return skb; 482 } 483 484 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 485 { 486 struct sk_buff *skb = NULL; 487 int type; 488 489 if (!pmc) { 490 read_lock(&in_dev->mc_list_lock); 491 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 492 if (pmc->multiaddr == IGMP_ALL_HOSTS) 493 continue; 494 spin_lock_bh(&pmc->lock); 495 if (pmc->sfcount[MCAST_EXCLUDE]) 496 type = IGMPV3_MODE_IS_EXCLUDE; 497 else 498 type = IGMPV3_MODE_IS_INCLUDE; 499 skb = add_grec(skb, pmc, type, 0, 0); 500 spin_unlock_bh(&pmc->lock); 501 } 502 read_unlock(&in_dev->mc_list_lock); 503 } else { 504 spin_lock_bh(&pmc->lock); 505 if (pmc->sfcount[MCAST_EXCLUDE]) 506 type = IGMPV3_MODE_IS_EXCLUDE; 507 else 508 type = IGMPV3_MODE_IS_INCLUDE; 509 skb = add_grec(skb, pmc, type, 0, 0); 510 spin_unlock_bh(&pmc->lock); 511 } 512 if (!skb) 513 return 0; 514 return igmpv3_sendpack(skb); 515 } 516 517 /* 518 * remove zero-count source records from a source filter list 519 */ 520 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 521 { 522 struct ip_sf_list *psf_prev, *psf_next, *psf; 523 524 psf_prev = NULL; 525 for (psf=*ppsf; psf; psf = psf_next) { 526 psf_next = psf->sf_next; 527 if (psf->sf_crcount == 0) { 528 if (psf_prev) 529 psf_prev->sf_next = psf->sf_next; 530 else 531 *ppsf = psf->sf_next; 532 kfree(psf); 533 } else 534 psf_prev = psf; 535 } 536 } 537 538 static void igmpv3_send_cr(struct in_device *in_dev) 539 { 540 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 541 struct sk_buff *skb = NULL; 542 int type, dtype; 543 544 read_lock(&in_dev->mc_list_lock); 545 spin_lock_bh(&in_dev->mc_tomb_lock); 546 547 /* deleted MCA's */ 548 pmc_prev = NULL; 549 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 550 pmc_next = pmc->next; 551 if (pmc->sfmode == MCAST_INCLUDE) { 552 type = IGMPV3_BLOCK_OLD_SOURCES; 553 dtype = IGMPV3_BLOCK_OLD_SOURCES; 554 skb = add_grec(skb, pmc, type, 1, 0); 555 skb = add_grec(skb, pmc, dtype, 1, 1); 556 } 557 if (pmc->crcount) { 558 pmc->crcount--; 559 if (pmc->sfmode == MCAST_EXCLUDE) { 560 type = IGMPV3_CHANGE_TO_INCLUDE; 561 skb = add_grec(skb, pmc, type, 1, 0); 562 } 563 if (pmc->crcount == 0) { 564 igmpv3_clear_zeros(&pmc->tomb); 565 igmpv3_clear_zeros(&pmc->sources); 566 } 567 } 568 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 569 if (pmc_prev) 570 pmc_prev->next = pmc_next; 571 else 572 in_dev->mc_tomb = pmc_next; 573 in_dev_put(pmc->interface); 574 kfree(pmc); 575 } else 576 pmc_prev = pmc; 577 } 578 spin_unlock_bh(&in_dev->mc_tomb_lock); 579 580 /* change recs */ 581 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 582 spin_lock_bh(&pmc->lock); 583 if (pmc->sfcount[MCAST_EXCLUDE]) { 584 type = IGMPV3_BLOCK_OLD_SOURCES; 585 dtype = IGMPV3_ALLOW_NEW_SOURCES; 586 } else { 587 type = IGMPV3_ALLOW_NEW_SOURCES; 588 dtype = IGMPV3_BLOCK_OLD_SOURCES; 589 } 590 skb = add_grec(skb, pmc, type, 0, 0); 591 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 592 593 /* filter mode changes */ 594 if (pmc->crcount) { 595 pmc->crcount--; 596 if (pmc->sfmode == MCAST_EXCLUDE) 597 type = IGMPV3_CHANGE_TO_EXCLUDE; 598 else 599 type = IGMPV3_CHANGE_TO_INCLUDE; 600 skb = add_grec(skb, pmc, type, 0, 0); 601 } 602 spin_unlock_bh(&pmc->lock); 603 } 604 read_unlock(&in_dev->mc_list_lock); 605 606 if (!skb) 607 return; 608 (void) igmpv3_sendpack(skb); 609 } 610 611 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 612 int type) 613 { 614 struct sk_buff *skb; 615 struct iphdr *iph; 616 struct igmphdr *ih; 617 struct rtable *rt; 618 struct net_device *dev = in_dev->dev; 619 u32 group = pmc ? pmc->multiaddr : 0; 620 u32 dst; 621 622 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 623 return igmpv3_send_report(in_dev, pmc); 624 else if (type == IGMP_HOST_LEAVE_MESSAGE) 625 dst = IGMP_ALL_ROUTER; 626 else 627 dst = group; 628 629 { 630 struct flowi fl = { .oif = dev->ifindex, 631 .nl_u = { .ip4_u = { .daddr = dst } }, 632 .proto = IPPROTO_IGMP }; 633 if (ip_route_output_key(&rt, &fl)) 634 return -1; 635 } 636 if (rt->rt_src == 0) { 637 ip_rt_put(rt); 638 return -1; 639 } 640 641 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 642 if (skb == NULL) { 643 ip_rt_put(rt); 644 return -1; 645 } 646 647 skb->dst = &rt->u.dst; 648 649 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 650 651 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); 652 653 iph->version = 4; 654 iph->ihl = (sizeof(struct iphdr)+4)>>2; 655 iph->tos = 0xc0; 656 iph->frag_off = htons(IP_DF); 657 iph->ttl = 1; 658 iph->daddr = dst; 659 iph->saddr = rt->rt_src; 660 iph->protocol = IPPROTO_IGMP; 661 iph->tot_len = htons(IGMP_SIZE); 662 ip_select_ident(iph, &rt->u.dst, NULL); 663 ((u8*)&iph[1])[0] = IPOPT_RA; 664 ((u8*)&iph[1])[1] = 4; 665 ((u8*)&iph[1])[2] = 0; 666 ((u8*)&iph[1])[3] = 0; 667 ip_send_check(iph); 668 669 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 670 ih->type=type; 671 ih->code=0; 672 ih->csum=0; 673 ih->group=group; 674 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 675 676 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 677 dst_output); 678 } 679 680 static void igmp_gq_timer_expire(unsigned long data) 681 { 682 struct in_device *in_dev = (struct in_device *)data; 683 684 in_dev->mr_gq_running = 0; 685 igmpv3_send_report(in_dev, NULL); 686 __in_dev_put(in_dev); 687 } 688 689 static void igmp_ifc_timer_expire(unsigned long data) 690 { 691 struct in_device *in_dev = (struct in_device *)data; 692 693 igmpv3_send_cr(in_dev); 694 if (in_dev->mr_ifc_count) { 695 in_dev->mr_ifc_count--; 696 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 697 } 698 __in_dev_put(in_dev); 699 } 700 701 static void igmp_ifc_event(struct in_device *in_dev) 702 { 703 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 704 return; 705 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 706 IGMP_Unsolicited_Report_Count; 707 igmp_ifc_start_timer(in_dev, 1); 708 } 709 710 711 static void igmp_timer_expire(unsigned long data) 712 { 713 struct ip_mc_list *im=(struct ip_mc_list *)data; 714 struct in_device *in_dev = im->interface; 715 716 spin_lock(&im->lock); 717 im->tm_running=0; 718 719 if (im->unsolicit_count) { 720 im->unsolicit_count--; 721 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 722 } 723 im->reporter = 1; 724 spin_unlock(&im->lock); 725 726 if (IGMP_V1_SEEN(in_dev)) 727 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 728 else if (IGMP_V2_SEEN(in_dev)) 729 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 730 else 731 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 732 733 ip_ma_put(im); 734 } 735 736 static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) 737 { 738 struct ip_sf_list *psf; 739 int i, scount; 740 741 scount = 0; 742 for (psf=pmc->sources; psf; psf=psf->sf_next) { 743 if (scount == nsrcs) 744 break; 745 for (i=0; i<nsrcs; i++) 746 if (srcs[i] == psf->sf_inaddr) { 747 psf->sf_gsresp = 1; 748 scount++; 749 break; 750 } 751 } 752 } 753 754 static void igmp_heard_report(struct in_device *in_dev, u32 group) 755 { 756 struct ip_mc_list *im; 757 758 /* Timers are only set for non-local groups */ 759 760 if (group == IGMP_ALL_HOSTS) 761 return; 762 763 read_lock(&in_dev->mc_list_lock); 764 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 765 if (im->multiaddr == group) { 766 igmp_stop_timer(im); 767 break; 768 } 769 } 770 read_unlock(&in_dev->mc_list_lock); 771 } 772 773 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 774 int len) 775 { 776 struct igmphdr *ih = skb->h.igmph; 777 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; 778 struct ip_mc_list *im; 779 u32 group = ih->group; 780 int max_delay; 781 int mark = 0; 782 783 784 if (len == 8) { 785 if (ih->code == 0) { 786 /* Alas, old v1 router presents here. */ 787 788 max_delay = IGMP_Query_Response_Interval; 789 in_dev->mr_v1_seen = jiffies + 790 IGMP_V1_Router_Present_Timeout; 791 group = 0; 792 } else { 793 /* v2 router present */ 794 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 795 in_dev->mr_v2_seen = jiffies + 796 IGMP_V2_Router_Present_Timeout; 797 } 798 /* cancel the interface change timer */ 799 in_dev->mr_ifc_count = 0; 800 if (del_timer(&in_dev->mr_ifc_timer)) 801 __in_dev_put(in_dev); 802 /* clear deleted report items */ 803 igmpv3_clear_delrec(in_dev); 804 } else if (len < 12) { 805 return; /* ignore bogus packet; freed by caller */ 806 } else { /* v3 */ 807 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 808 return; 809 810 ih3 = (struct igmpv3_query *) skb->h.raw; 811 if (ih3->nsrcs) { 812 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 813 + ntohs(ih3->nsrcs)*sizeof(__u32))) 814 return; 815 ih3 = (struct igmpv3_query *) skb->h.raw; 816 } 817 818 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 819 if (!max_delay) 820 max_delay = 1; /* can't mod w/ 0 */ 821 in_dev->mr_maxdelay = max_delay; 822 if (ih3->qrv) 823 in_dev->mr_qrv = ih3->qrv; 824 if (!group) { /* general query */ 825 if (ih3->nsrcs) 826 return; /* no sources allowed */ 827 igmp_gq_start_timer(in_dev); 828 return; 829 } 830 /* mark sources to include, if group & source-specific */ 831 mark = ih3->nsrcs != 0; 832 } 833 834 /* 835 * - Start the timers in all of our membership records 836 * that the query applies to for the interface on 837 * which the query arrived excl. those that belong 838 * to a "local" group (224.0.0.X) 839 * - For timers already running check if they need to 840 * be reset. 841 * - Use the igmp->igmp_code field as the maximum 842 * delay possible 843 */ 844 read_lock(&in_dev->mc_list_lock); 845 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 846 if (group && group != im->multiaddr) 847 continue; 848 if (im->multiaddr == IGMP_ALL_HOSTS) 849 continue; 850 spin_lock_bh(&im->lock); 851 if (im->tm_running) 852 im->gsquery = im->gsquery && mark; 853 else 854 im->gsquery = mark; 855 if (im->gsquery) 856 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 857 spin_unlock_bh(&im->lock); 858 igmp_mod_timer(im, max_delay); 859 } 860 read_unlock(&in_dev->mc_list_lock); 861 } 862 863 int igmp_rcv(struct sk_buff *skb) 864 { 865 /* This basically follows the spec line by line -- see RFC1112 */ 866 struct igmphdr *ih; 867 struct in_device *in_dev = in_dev_get(skb->dev); 868 int len = skb->len; 869 870 if (in_dev==NULL) { 871 kfree_skb(skb); 872 return 0; 873 } 874 875 if (!pskb_may_pull(skb, sizeof(struct igmphdr)) || 876 (u16)csum_fold(skb_checksum(skb, 0, len, 0))) { 877 in_dev_put(in_dev); 878 kfree_skb(skb); 879 return 0; 880 } 881 882 ih = skb->h.igmph; 883 switch (ih->type) { 884 case IGMP_HOST_MEMBERSHIP_QUERY: 885 igmp_heard_query(in_dev, skb, len); 886 break; 887 case IGMP_HOST_MEMBERSHIP_REPORT: 888 case IGMPV2_HOST_MEMBERSHIP_REPORT: 889 case IGMPV3_HOST_MEMBERSHIP_REPORT: 890 /* Is it our report looped back? */ 891 if (((struct rtable*)skb->dst)->fl.iif == 0) 892 break; 893 igmp_heard_report(in_dev, ih->group); 894 break; 895 case IGMP_PIM: 896 #ifdef CONFIG_IP_PIMSM_V1 897 in_dev_put(in_dev); 898 return pim_rcv_v1(skb); 899 #endif 900 case IGMP_DVMRP: 901 case IGMP_TRACE: 902 case IGMP_HOST_LEAVE_MESSAGE: 903 case IGMP_MTRACE: 904 case IGMP_MTRACE_RESP: 905 break; 906 default: 907 NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type)); 908 } 909 in_dev_put(in_dev); 910 kfree_skb(skb); 911 return 0; 912 } 913 914 #endif 915 916 917 /* 918 * Add a filter to a device 919 */ 920 921 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr) 922 { 923 char buf[MAX_ADDR_LEN]; 924 struct net_device *dev = in_dev->dev; 925 926 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 927 We will get multicast token leakage, when IFF_MULTICAST 928 is changed. This check should be done in dev->set_multicast_list 929 routine. Something sort of: 930 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 931 --ANK 932 */ 933 if (arp_mc_map(addr, buf, dev, 0) == 0) 934 dev_mc_add(dev,buf,dev->addr_len,0); 935 } 936 937 /* 938 * Remove a filter from a device 939 */ 940 941 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) 942 { 943 char buf[MAX_ADDR_LEN]; 944 struct net_device *dev = in_dev->dev; 945 946 if (arp_mc_map(addr, buf, dev, 0) == 0) 947 dev_mc_delete(dev,buf,dev->addr_len,0); 948 } 949 950 #ifdef CONFIG_IP_MULTICAST 951 /* 952 * deleted ip_mc_list manipulation 953 */ 954 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 955 { 956 struct ip_mc_list *pmc; 957 958 /* this is an "ip_mc_list" for convenience; only the fields below 959 * are actually used. In particular, the refcnt and users are not 960 * used for management of the delete list. Using the same structure 961 * for deleted items allows change reports to use common code with 962 * non-deleted or query-response MCA's. 963 */ 964 pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL); 965 if (!pmc) 966 return; 967 memset(pmc, 0, sizeof(*pmc)); 968 spin_lock_bh(&im->lock); 969 pmc->interface = im->interface; 970 in_dev_hold(in_dev); 971 pmc->multiaddr = im->multiaddr; 972 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 973 IGMP_Unsolicited_Report_Count; 974 pmc->sfmode = im->sfmode; 975 if (pmc->sfmode == MCAST_INCLUDE) { 976 struct ip_sf_list *psf; 977 978 pmc->tomb = im->tomb; 979 pmc->sources = im->sources; 980 im->tomb = im->sources = NULL; 981 for (psf=pmc->sources; psf; psf=psf->sf_next) 982 psf->sf_crcount = pmc->crcount; 983 } 984 spin_unlock_bh(&im->lock); 985 986 spin_lock_bh(&in_dev->mc_tomb_lock); 987 pmc->next = in_dev->mc_tomb; 988 in_dev->mc_tomb = pmc; 989 spin_unlock_bh(&in_dev->mc_tomb_lock); 990 } 991 992 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) 993 { 994 struct ip_mc_list *pmc, *pmc_prev; 995 struct ip_sf_list *psf, *psf_next; 996 997 spin_lock_bh(&in_dev->mc_tomb_lock); 998 pmc_prev = NULL; 999 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1000 if (pmc->multiaddr == multiaddr) 1001 break; 1002 pmc_prev = pmc; 1003 } 1004 if (pmc) { 1005 if (pmc_prev) 1006 pmc_prev->next = pmc->next; 1007 else 1008 in_dev->mc_tomb = pmc->next; 1009 } 1010 spin_unlock_bh(&in_dev->mc_tomb_lock); 1011 if (pmc) { 1012 for (psf=pmc->tomb; psf; psf=psf_next) { 1013 psf_next = psf->sf_next; 1014 kfree(psf); 1015 } 1016 in_dev_put(pmc->interface); 1017 kfree(pmc); 1018 } 1019 } 1020 1021 static void igmpv3_clear_delrec(struct in_device *in_dev) 1022 { 1023 struct ip_mc_list *pmc, *nextpmc; 1024 1025 spin_lock_bh(&in_dev->mc_tomb_lock); 1026 pmc = in_dev->mc_tomb; 1027 in_dev->mc_tomb = NULL; 1028 spin_unlock_bh(&in_dev->mc_tomb_lock); 1029 1030 for (; pmc; pmc = nextpmc) { 1031 nextpmc = pmc->next; 1032 ip_mc_clear_src(pmc); 1033 in_dev_put(pmc->interface); 1034 kfree(pmc); 1035 } 1036 /* clear dead sources, too */ 1037 read_lock(&in_dev->mc_list_lock); 1038 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1039 struct ip_sf_list *psf, *psf_next; 1040 1041 spin_lock_bh(&pmc->lock); 1042 psf = pmc->tomb; 1043 pmc->tomb = NULL; 1044 spin_unlock_bh(&pmc->lock); 1045 for (; psf; psf=psf_next) { 1046 psf_next = psf->sf_next; 1047 kfree(psf); 1048 } 1049 } 1050 read_unlock(&in_dev->mc_list_lock); 1051 } 1052 #endif 1053 1054 static void igmp_group_dropped(struct ip_mc_list *im) 1055 { 1056 struct in_device *in_dev = im->interface; 1057 #ifdef CONFIG_IP_MULTICAST 1058 int reporter; 1059 #endif 1060 1061 if (im->loaded) { 1062 im->loaded = 0; 1063 ip_mc_filter_del(in_dev, im->multiaddr); 1064 } 1065 1066 #ifdef CONFIG_IP_MULTICAST 1067 if (im->multiaddr == IGMP_ALL_HOSTS) 1068 return; 1069 1070 reporter = im->reporter; 1071 igmp_stop_timer(im); 1072 1073 if (!in_dev->dead) { 1074 if (IGMP_V1_SEEN(in_dev)) 1075 goto done; 1076 if (IGMP_V2_SEEN(in_dev)) { 1077 if (reporter) 1078 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1079 goto done; 1080 } 1081 /* IGMPv3 */ 1082 igmpv3_add_delrec(in_dev, im); 1083 1084 igmp_ifc_event(in_dev); 1085 } 1086 done: 1087 #endif 1088 ip_mc_clear_src(im); 1089 } 1090 1091 static void igmp_group_added(struct ip_mc_list *im) 1092 { 1093 struct in_device *in_dev = im->interface; 1094 1095 if (im->loaded == 0) { 1096 im->loaded = 1; 1097 ip_mc_filter_add(in_dev, im->multiaddr); 1098 } 1099 1100 #ifdef CONFIG_IP_MULTICAST 1101 if (im->multiaddr == IGMP_ALL_HOSTS) 1102 return; 1103 1104 if (in_dev->dead) 1105 return; 1106 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1107 spin_lock_bh(&im->lock); 1108 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1109 spin_unlock_bh(&im->lock); 1110 return; 1111 } 1112 /* else, v3 */ 1113 1114 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1115 IGMP_Unsolicited_Report_Count; 1116 igmp_ifc_event(in_dev); 1117 #endif 1118 } 1119 1120 1121 /* 1122 * Multicast list managers 1123 */ 1124 1125 1126 /* 1127 * A socket has joined a multicast group on device dev. 1128 */ 1129 1130 void ip_mc_inc_group(struct in_device *in_dev, u32 addr) 1131 { 1132 struct ip_mc_list *im; 1133 1134 ASSERT_RTNL(); 1135 1136 for (im=in_dev->mc_list; im; im=im->next) { 1137 if (im->multiaddr == addr) { 1138 im->users++; 1139 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1140 goto out; 1141 } 1142 } 1143 1144 im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL); 1145 if (!im) 1146 goto out; 1147 1148 im->users=1; 1149 im->interface=in_dev; 1150 in_dev_hold(in_dev); 1151 im->multiaddr=addr; 1152 /* initial mode is (EX, empty) */ 1153 im->sfmode = MCAST_EXCLUDE; 1154 im->sfcount[MCAST_INCLUDE] = 0; 1155 im->sfcount[MCAST_EXCLUDE] = 1; 1156 im->sources = NULL; 1157 im->tomb = NULL; 1158 im->crcount = 0; 1159 atomic_set(&im->refcnt, 1); 1160 spin_lock_init(&im->lock); 1161 #ifdef CONFIG_IP_MULTICAST 1162 im->tm_running=0; 1163 init_timer(&im->timer); 1164 im->timer.data=(unsigned long)im; 1165 im->timer.function=&igmp_timer_expire; 1166 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1167 im->reporter = 0; 1168 im->gsquery = 0; 1169 #endif 1170 im->loaded = 0; 1171 write_lock_bh(&in_dev->mc_list_lock); 1172 im->next=in_dev->mc_list; 1173 in_dev->mc_list=im; 1174 write_unlock_bh(&in_dev->mc_list_lock); 1175 #ifdef CONFIG_IP_MULTICAST 1176 igmpv3_del_delrec(in_dev, im->multiaddr); 1177 #endif 1178 igmp_group_added(im); 1179 if (!in_dev->dead) 1180 ip_rt_multicast_event(in_dev); 1181 out: 1182 return; 1183 } 1184 1185 /* 1186 * A socket has left a multicast group on device dev 1187 */ 1188 1189 void ip_mc_dec_group(struct in_device *in_dev, u32 addr) 1190 { 1191 struct ip_mc_list *i, **ip; 1192 1193 ASSERT_RTNL(); 1194 1195 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1196 if (i->multiaddr==addr) { 1197 if (--i->users == 0) { 1198 write_lock_bh(&in_dev->mc_list_lock); 1199 *ip = i->next; 1200 write_unlock_bh(&in_dev->mc_list_lock); 1201 igmp_group_dropped(i); 1202 1203 if (!in_dev->dead) 1204 ip_rt_multicast_event(in_dev); 1205 1206 ip_ma_put(i); 1207 return; 1208 } 1209 break; 1210 } 1211 } 1212 } 1213 1214 /* Device going down */ 1215 1216 void ip_mc_down(struct in_device *in_dev) 1217 { 1218 struct ip_mc_list *i; 1219 1220 ASSERT_RTNL(); 1221 1222 for (i=in_dev->mc_list; i; i=i->next) 1223 igmp_group_dropped(i); 1224 1225 #ifdef CONFIG_IP_MULTICAST 1226 in_dev->mr_ifc_count = 0; 1227 if (del_timer(&in_dev->mr_ifc_timer)) 1228 __in_dev_put(in_dev); 1229 in_dev->mr_gq_running = 0; 1230 if (del_timer(&in_dev->mr_gq_timer)) 1231 __in_dev_put(in_dev); 1232 igmpv3_clear_delrec(in_dev); 1233 #endif 1234 1235 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1236 } 1237 1238 void ip_mc_init_dev(struct in_device *in_dev) 1239 { 1240 ASSERT_RTNL(); 1241 1242 in_dev->mc_tomb = NULL; 1243 #ifdef CONFIG_IP_MULTICAST 1244 in_dev->mr_gq_running = 0; 1245 init_timer(&in_dev->mr_gq_timer); 1246 in_dev->mr_gq_timer.data=(unsigned long) in_dev; 1247 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; 1248 in_dev->mr_ifc_count = 0; 1249 init_timer(&in_dev->mr_ifc_timer); 1250 in_dev->mr_ifc_timer.data=(unsigned long) in_dev; 1251 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; 1252 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1253 #endif 1254 1255 rwlock_init(&in_dev->mc_list_lock); 1256 spin_lock_init(&in_dev->mc_tomb_lock); 1257 } 1258 1259 /* Device going up */ 1260 1261 void ip_mc_up(struct in_device *in_dev) 1262 { 1263 struct ip_mc_list *i; 1264 1265 ASSERT_RTNL(); 1266 1267 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1268 1269 for (i=in_dev->mc_list; i; i=i->next) 1270 igmp_group_added(i); 1271 } 1272 1273 /* 1274 * Device is about to be destroyed: clean up. 1275 */ 1276 1277 void ip_mc_destroy_dev(struct in_device *in_dev) 1278 { 1279 struct ip_mc_list *i; 1280 1281 ASSERT_RTNL(); 1282 1283 /* Deactivate timers */ 1284 ip_mc_down(in_dev); 1285 1286 write_lock_bh(&in_dev->mc_list_lock); 1287 while ((i = in_dev->mc_list) != NULL) { 1288 in_dev->mc_list = i->next; 1289 write_unlock_bh(&in_dev->mc_list_lock); 1290 1291 igmp_group_dropped(i); 1292 ip_ma_put(i); 1293 1294 write_lock_bh(&in_dev->mc_list_lock); 1295 } 1296 write_unlock_bh(&in_dev->mc_list_lock); 1297 } 1298 1299 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1300 { 1301 struct flowi fl = { .nl_u = { .ip4_u = 1302 { .daddr = imr->imr_multiaddr.s_addr } } }; 1303 struct rtable *rt; 1304 struct net_device *dev = NULL; 1305 struct in_device *idev = NULL; 1306 1307 if (imr->imr_ifindex) { 1308 idev = inetdev_by_index(imr->imr_ifindex); 1309 if (idev) 1310 __in_dev_put(idev); 1311 return idev; 1312 } 1313 if (imr->imr_address.s_addr) { 1314 dev = ip_dev_find(imr->imr_address.s_addr); 1315 if (!dev) 1316 return NULL; 1317 __dev_put(dev); 1318 } 1319 1320 if (!dev && !ip_route_output_key(&rt, &fl)) { 1321 dev = rt->u.dst.dev; 1322 ip_rt_put(rt); 1323 } 1324 if (dev) { 1325 imr->imr_ifindex = dev->ifindex; 1326 idev = __in_dev_get(dev); 1327 } 1328 return idev; 1329 } 1330 1331 /* 1332 * Join a socket to a group 1333 */ 1334 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; 1335 int sysctl_igmp_max_msf = IP_MAX_MSF; 1336 1337 1338 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1339 __u32 *psfsrc) 1340 { 1341 struct ip_sf_list *psf, *psf_prev; 1342 int rv = 0; 1343 1344 psf_prev = NULL; 1345 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1346 if (psf->sf_inaddr == *psfsrc) 1347 break; 1348 psf_prev = psf; 1349 } 1350 if (!psf || psf->sf_count[sfmode] == 0) { 1351 /* source filter not found, or count wrong => bug */ 1352 return -ESRCH; 1353 } 1354 psf->sf_count[sfmode]--; 1355 if (psf->sf_count[sfmode] == 0) { 1356 ip_rt_multicast_event(pmc->interface); 1357 } 1358 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1359 #ifdef CONFIG_IP_MULTICAST 1360 struct in_device *in_dev = pmc->interface; 1361 #endif 1362 1363 /* no more filters for this source */ 1364 if (psf_prev) 1365 psf_prev->sf_next = psf->sf_next; 1366 else 1367 pmc->sources = psf->sf_next; 1368 #ifdef CONFIG_IP_MULTICAST 1369 if (psf->sf_oldin && 1370 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1371 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1372 IGMP_Unsolicited_Report_Count; 1373 psf->sf_next = pmc->tomb; 1374 pmc->tomb = psf; 1375 rv = 1; 1376 } else 1377 #endif 1378 kfree(psf); 1379 } 1380 return rv; 1381 } 1382 1383 #ifndef CONFIG_IP_MULTICAST 1384 #define igmp_ifc_event(x) do { } while (0) 1385 #endif 1386 1387 static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 1388 int sfcount, __u32 *psfsrc, int delta) 1389 { 1390 struct ip_mc_list *pmc; 1391 int changerec = 0; 1392 int i, err; 1393 1394 if (!in_dev) 1395 return -ENODEV; 1396 read_lock(&in_dev->mc_list_lock); 1397 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1398 if (*pmca == pmc->multiaddr) 1399 break; 1400 } 1401 if (!pmc) { 1402 /* MCA not found?? bug */ 1403 read_unlock(&in_dev->mc_list_lock); 1404 return -ESRCH; 1405 } 1406 spin_lock_bh(&pmc->lock); 1407 read_unlock(&in_dev->mc_list_lock); 1408 #ifdef CONFIG_IP_MULTICAST 1409 sf_markstate(pmc); 1410 #endif 1411 if (!delta) { 1412 err = -EINVAL; 1413 if (!pmc->sfcount[sfmode]) 1414 goto out_unlock; 1415 pmc->sfcount[sfmode]--; 1416 } 1417 err = 0; 1418 for (i=0; i<sfcount; i++) { 1419 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1420 1421 changerec |= rv > 0; 1422 if (!err && rv < 0) 1423 err = rv; 1424 } 1425 if (pmc->sfmode == MCAST_EXCLUDE && 1426 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1427 pmc->sfcount[MCAST_INCLUDE]) { 1428 #ifdef CONFIG_IP_MULTICAST 1429 struct ip_sf_list *psf; 1430 #endif 1431 1432 /* filter mode change */ 1433 pmc->sfmode = MCAST_INCLUDE; 1434 #ifdef CONFIG_IP_MULTICAST 1435 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1436 IGMP_Unsolicited_Report_Count; 1437 in_dev->mr_ifc_count = pmc->crcount; 1438 for (psf=pmc->sources; psf; psf = psf->sf_next) 1439 psf->sf_crcount = 0; 1440 igmp_ifc_event(pmc->interface); 1441 } else if (sf_setstate(pmc) || changerec) { 1442 igmp_ifc_event(pmc->interface); 1443 #endif 1444 } 1445 out_unlock: 1446 spin_unlock_bh(&pmc->lock); 1447 return err; 1448 } 1449 1450 /* 1451 * Add multicast single-source filter to the interface list 1452 */ 1453 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1454 __u32 *psfsrc, int delta) 1455 { 1456 struct ip_sf_list *psf, *psf_prev; 1457 1458 psf_prev = NULL; 1459 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1460 if (psf->sf_inaddr == *psfsrc) 1461 break; 1462 psf_prev = psf; 1463 } 1464 if (!psf) { 1465 psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); 1466 if (!psf) 1467 return -ENOBUFS; 1468 memset(psf, 0, sizeof(*psf)); 1469 psf->sf_inaddr = *psfsrc; 1470 if (psf_prev) { 1471 psf_prev->sf_next = psf; 1472 } else 1473 pmc->sources = psf; 1474 } 1475 psf->sf_count[sfmode]++; 1476 if (psf->sf_count[sfmode] == 1) { 1477 ip_rt_multicast_event(pmc->interface); 1478 } 1479 return 0; 1480 } 1481 1482 #ifdef CONFIG_IP_MULTICAST 1483 static void sf_markstate(struct ip_mc_list *pmc) 1484 { 1485 struct ip_sf_list *psf; 1486 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1487 1488 for (psf=pmc->sources; psf; psf=psf->sf_next) 1489 if (pmc->sfcount[MCAST_EXCLUDE]) { 1490 psf->sf_oldin = mca_xcount == 1491 psf->sf_count[MCAST_EXCLUDE] && 1492 !psf->sf_count[MCAST_INCLUDE]; 1493 } else 1494 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1495 } 1496 1497 static int sf_setstate(struct ip_mc_list *pmc) 1498 { 1499 struct ip_sf_list *psf; 1500 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1501 int qrv = pmc->interface->mr_qrv; 1502 int new_in, rv; 1503 1504 rv = 0; 1505 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1506 if (pmc->sfcount[MCAST_EXCLUDE]) { 1507 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1508 !psf->sf_count[MCAST_INCLUDE]; 1509 } else 1510 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1511 if (new_in != psf->sf_oldin) { 1512 psf->sf_crcount = qrv; 1513 rv++; 1514 } 1515 } 1516 return rv; 1517 } 1518 #endif 1519 1520 /* 1521 * Add multicast source filter list to the interface list 1522 */ 1523 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 1524 int sfcount, __u32 *psfsrc, int delta) 1525 { 1526 struct ip_mc_list *pmc; 1527 int isexclude; 1528 int i, err; 1529 1530 if (!in_dev) 1531 return -ENODEV; 1532 read_lock(&in_dev->mc_list_lock); 1533 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1534 if (*pmca == pmc->multiaddr) 1535 break; 1536 } 1537 if (!pmc) { 1538 /* MCA not found?? bug */ 1539 read_unlock(&in_dev->mc_list_lock); 1540 return -ESRCH; 1541 } 1542 spin_lock_bh(&pmc->lock); 1543 read_unlock(&in_dev->mc_list_lock); 1544 1545 #ifdef CONFIG_IP_MULTICAST 1546 sf_markstate(pmc); 1547 #endif 1548 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1549 if (!delta) 1550 pmc->sfcount[sfmode]++; 1551 err = 0; 1552 for (i=0; i<sfcount; i++) { 1553 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1554 if (err) 1555 break; 1556 } 1557 if (err) { 1558 int j; 1559 1560 pmc->sfcount[sfmode]--; 1561 for (j=0; j<i; j++) 1562 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1563 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1564 #ifdef CONFIG_IP_MULTICAST 1565 struct in_device *in_dev = pmc->interface; 1566 struct ip_sf_list *psf; 1567 #endif 1568 1569 /* filter mode change */ 1570 if (pmc->sfcount[MCAST_EXCLUDE]) 1571 pmc->sfmode = MCAST_EXCLUDE; 1572 else if (pmc->sfcount[MCAST_INCLUDE]) 1573 pmc->sfmode = MCAST_INCLUDE; 1574 #ifdef CONFIG_IP_MULTICAST 1575 /* else no filters; keep old mode for reports */ 1576 1577 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1578 IGMP_Unsolicited_Report_Count; 1579 in_dev->mr_ifc_count = pmc->crcount; 1580 for (psf=pmc->sources; psf; psf = psf->sf_next) 1581 psf->sf_crcount = 0; 1582 igmp_ifc_event(in_dev); 1583 } else if (sf_setstate(pmc)) { 1584 igmp_ifc_event(in_dev); 1585 #endif 1586 } 1587 spin_unlock_bh(&pmc->lock); 1588 return err; 1589 } 1590 1591 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1592 { 1593 struct ip_sf_list *psf, *nextpsf; 1594 1595 for (psf=pmc->tomb; psf; psf=nextpsf) { 1596 nextpsf = psf->sf_next; 1597 kfree(psf); 1598 } 1599 pmc->tomb = NULL; 1600 for (psf=pmc->sources; psf; psf=nextpsf) { 1601 nextpsf = psf->sf_next; 1602 kfree(psf); 1603 } 1604 pmc->sources = NULL; 1605 pmc->sfmode = MCAST_EXCLUDE; 1606 pmc->sfcount[MCAST_EXCLUDE] = 0; 1607 pmc->sfcount[MCAST_EXCLUDE] = 1; 1608 } 1609 1610 1611 /* 1612 * Join a multicast group 1613 */ 1614 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1615 { 1616 int err; 1617 u32 addr = imr->imr_multiaddr.s_addr; 1618 struct ip_mc_socklist *iml=NULL, *i; 1619 struct in_device *in_dev; 1620 struct inet_sock *inet = inet_sk(sk); 1621 int ifindex; 1622 int count = 0; 1623 1624 if (!MULTICAST(addr)) 1625 return -EINVAL; 1626 1627 rtnl_shlock(); 1628 1629 in_dev = ip_mc_find_dev(imr); 1630 1631 if (!in_dev) { 1632 iml = NULL; 1633 err = -ENODEV; 1634 goto done; 1635 } 1636 1637 err = -EADDRINUSE; 1638 ifindex = imr->imr_ifindex; 1639 for (i = inet->mc_list; i; i = i->next) { 1640 if (i->multi.imr_multiaddr.s_addr == addr && 1641 i->multi.imr_ifindex == ifindex) 1642 goto done; 1643 count++; 1644 } 1645 err = -ENOBUFS; 1646 if (count >= sysctl_igmp_max_memberships) 1647 goto done; 1648 iml = (struct ip_mc_socklist *)sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1649 if (iml == NULL) 1650 goto done; 1651 1652 memcpy(&iml->multi, imr, sizeof(*imr)); 1653 iml->next = inet->mc_list; 1654 iml->sflist = NULL; 1655 iml->sfmode = MCAST_EXCLUDE; 1656 inet->mc_list = iml; 1657 ip_mc_inc_group(in_dev, addr); 1658 err = 0; 1659 done: 1660 rtnl_shunlock(); 1661 return err; 1662 } 1663 1664 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1665 struct in_device *in_dev) 1666 { 1667 int err; 1668 1669 if (iml->sflist == 0) { 1670 /* any-source empty exclude case */ 1671 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1672 iml->sfmode, 0, NULL, 0); 1673 } 1674 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1675 iml->sfmode, iml->sflist->sl_count, 1676 iml->sflist->sl_addr, 0); 1677 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1678 iml->sflist = NULL; 1679 return err; 1680 } 1681 1682 /* 1683 * Ask a socket to leave a group. 1684 */ 1685 1686 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1687 { 1688 struct inet_sock *inet = inet_sk(sk); 1689 struct ip_mc_socklist *iml, **imlp; 1690 1691 rtnl_lock(); 1692 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1693 if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr && 1694 iml->multi.imr_address.s_addr==imr->imr_address.s_addr && 1695 (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) { 1696 struct in_device *in_dev; 1697 1698 in_dev = inetdev_by_index(iml->multi.imr_ifindex); 1699 if (in_dev) 1700 (void) ip_mc_leave_src(sk, iml, in_dev); 1701 1702 *imlp = iml->next; 1703 1704 if (in_dev) { 1705 ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr); 1706 in_dev_put(in_dev); 1707 } 1708 rtnl_unlock(); 1709 sock_kfree_s(sk, iml, sizeof(*iml)); 1710 return 0; 1711 } 1712 } 1713 rtnl_unlock(); 1714 return -EADDRNOTAVAIL; 1715 } 1716 1717 int ip_mc_source(int add, int omode, struct sock *sk, struct 1718 ip_mreq_source *mreqs, int ifindex) 1719 { 1720 int err; 1721 struct ip_mreqn imr; 1722 u32 addr = mreqs->imr_multiaddr; 1723 struct ip_mc_socklist *pmc; 1724 struct in_device *in_dev = NULL; 1725 struct inet_sock *inet = inet_sk(sk); 1726 struct ip_sf_socklist *psl; 1727 int i, j, rv; 1728 1729 if (!MULTICAST(addr)) 1730 return -EINVAL; 1731 1732 rtnl_shlock(); 1733 1734 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1735 imr.imr_address.s_addr = mreqs->imr_interface; 1736 imr.imr_ifindex = ifindex; 1737 in_dev = ip_mc_find_dev(&imr); 1738 1739 if (!in_dev) { 1740 err = -ENODEV; 1741 goto done; 1742 } 1743 err = -EADDRNOTAVAIL; 1744 1745 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1746 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1747 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1748 break; 1749 } 1750 if (!pmc) /* must have a prior join */ 1751 goto done; 1752 /* if a source filter was set, must be the same mode as before */ 1753 if (pmc->sflist) { 1754 if (pmc->sfmode != omode) 1755 goto done; 1756 } else if (pmc->sfmode != omode) { 1757 /* allow mode switches for empty-set filters */ 1758 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1759 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1760 NULL, 0); 1761 pmc->sfmode = omode; 1762 } 1763 1764 psl = pmc->sflist; 1765 if (!add) { 1766 if (!psl) 1767 goto done; 1768 rv = !0; 1769 for (i=0; i<psl->sl_count; i++) { 1770 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1771 sizeof(__u32)); 1772 if (rv == 0) 1773 break; 1774 } 1775 if (rv) /* source not found */ 1776 goto done; 1777 1778 /* update the interface filter */ 1779 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1780 &mreqs->imr_sourceaddr, 1); 1781 1782 for (j=i+1; j<psl->sl_count; j++) 1783 psl->sl_addr[j-1] = psl->sl_addr[j]; 1784 psl->sl_count--; 1785 err = 0; 1786 goto done; 1787 } 1788 /* else, add a new source to the filter */ 1789 1790 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1791 err = -ENOBUFS; 1792 goto done; 1793 } 1794 if (!psl || psl->sl_count == psl->sl_max) { 1795 struct ip_sf_socklist *newpsl; 1796 int count = IP_SFBLOCK; 1797 1798 if (psl) 1799 count += psl->sl_max; 1800 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, 1801 IP_SFLSIZE(count), GFP_KERNEL); 1802 if (!newpsl) { 1803 err = -ENOBUFS; 1804 goto done; 1805 } 1806 newpsl->sl_max = count; 1807 newpsl->sl_count = count - IP_SFBLOCK; 1808 if (psl) { 1809 for (i=0; i<psl->sl_count; i++) 1810 newpsl->sl_addr[i] = psl->sl_addr[i]; 1811 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1812 } 1813 pmc->sflist = psl = newpsl; 1814 } 1815 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1816 for (i=0; i<psl->sl_count; i++) { 1817 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1818 sizeof(__u32)); 1819 if (rv == 0) 1820 break; 1821 } 1822 if (rv == 0) /* address already there is an error */ 1823 goto done; 1824 for (j=psl->sl_count-1; j>=i; j--) 1825 psl->sl_addr[j+1] = psl->sl_addr[j]; 1826 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1827 psl->sl_count++; 1828 err = 0; 1829 /* update the interface list */ 1830 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1831 &mreqs->imr_sourceaddr, 1); 1832 done: 1833 rtnl_shunlock(); 1834 return err; 1835 } 1836 1837 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1838 { 1839 int err; 1840 struct ip_mreqn imr; 1841 u32 addr = msf->imsf_multiaddr; 1842 struct ip_mc_socklist *pmc; 1843 struct in_device *in_dev; 1844 struct inet_sock *inet = inet_sk(sk); 1845 struct ip_sf_socklist *newpsl, *psl; 1846 1847 if (!MULTICAST(addr)) 1848 return -EINVAL; 1849 if (msf->imsf_fmode != MCAST_INCLUDE && 1850 msf->imsf_fmode != MCAST_EXCLUDE) 1851 return -EINVAL; 1852 1853 rtnl_shlock(); 1854 1855 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 1856 imr.imr_address.s_addr = msf->imsf_interface; 1857 imr.imr_ifindex = ifindex; 1858 in_dev = ip_mc_find_dev(&imr); 1859 1860 if (!in_dev) { 1861 err = -ENODEV; 1862 goto done; 1863 } 1864 err = -EADDRNOTAVAIL; 1865 1866 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1867 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 1868 pmc->multi.imr_ifindex == imr.imr_ifindex) 1869 break; 1870 } 1871 if (!pmc) /* must have a prior join */ 1872 goto done; 1873 if (msf->imsf_numsrc) { 1874 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, 1875 IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL); 1876 if (!newpsl) { 1877 err = -ENOBUFS; 1878 goto done; 1879 } 1880 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 1881 memcpy(newpsl->sl_addr, msf->imsf_slist, 1882 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 1883 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 1884 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 1885 if (err) { 1886 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 1887 goto done; 1888 } 1889 } else 1890 newpsl = NULL; 1891 psl = pmc->sflist; 1892 if (psl) { 1893 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 1894 psl->sl_count, psl->sl_addr, 0); 1895 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1896 } else 1897 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 1898 0, NULL, 0); 1899 pmc->sflist = newpsl; 1900 pmc->sfmode = msf->imsf_fmode; 1901 done: 1902 rtnl_shunlock(); 1903 return err; 1904 } 1905 1906 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 1907 struct ip_msfilter __user *optval, int __user *optlen) 1908 { 1909 int err, len, count, copycount; 1910 struct ip_mreqn imr; 1911 u32 addr = msf->imsf_multiaddr; 1912 struct ip_mc_socklist *pmc; 1913 struct in_device *in_dev; 1914 struct inet_sock *inet = inet_sk(sk); 1915 struct ip_sf_socklist *psl; 1916 1917 if (!MULTICAST(addr)) 1918 return -EINVAL; 1919 1920 rtnl_shlock(); 1921 1922 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 1923 imr.imr_address.s_addr = msf->imsf_interface; 1924 imr.imr_ifindex = 0; 1925 in_dev = ip_mc_find_dev(&imr); 1926 1927 if (!in_dev) { 1928 err = -ENODEV; 1929 goto done; 1930 } 1931 err = -EADDRNOTAVAIL; 1932 1933 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1934 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 1935 pmc->multi.imr_ifindex == imr.imr_ifindex) 1936 break; 1937 } 1938 if (!pmc) /* must have a prior join */ 1939 goto done; 1940 msf->imsf_fmode = pmc->sfmode; 1941 psl = pmc->sflist; 1942 rtnl_shunlock(); 1943 if (!psl) { 1944 len = 0; 1945 count = 0; 1946 } else { 1947 count = psl->sl_count; 1948 } 1949 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 1950 len = copycount * sizeof(psl->sl_addr[0]); 1951 msf->imsf_numsrc = count; 1952 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 1953 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 1954 return -EFAULT; 1955 } 1956 if (len && 1957 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 1958 return -EFAULT; 1959 return 0; 1960 done: 1961 rtnl_shunlock(); 1962 return err; 1963 } 1964 1965 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 1966 struct group_filter __user *optval, int __user *optlen) 1967 { 1968 int err, i, count, copycount; 1969 struct sockaddr_in *psin; 1970 u32 addr; 1971 struct ip_mc_socklist *pmc; 1972 struct inet_sock *inet = inet_sk(sk); 1973 struct ip_sf_socklist *psl; 1974 1975 psin = (struct sockaddr_in *)&gsf->gf_group; 1976 if (psin->sin_family != AF_INET) 1977 return -EINVAL; 1978 addr = psin->sin_addr.s_addr; 1979 if (!MULTICAST(addr)) 1980 return -EINVAL; 1981 1982 rtnl_shlock(); 1983 1984 err = -EADDRNOTAVAIL; 1985 1986 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1987 if (pmc->multi.imr_multiaddr.s_addr == addr && 1988 pmc->multi.imr_ifindex == gsf->gf_interface) 1989 break; 1990 } 1991 if (!pmc) /* must have a prior join */ 1992 goto done; 1993 gsf->gf_fmode = pmc->sfmode; 1994 psl = pmc->sflist; 1995 rtnl_shunlock(); 1996 count = psl ? psl->sl_count : 0; 1997 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 1998 gsf->gf_numsrc = count; 1999 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2000 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2001 return -EFAULT; 2002 } 2003 for (i=0; i<copycount; i++) { 2004 struct sockaddr_in *psin; 2005 struct sockaddr_storage ss; 2006 2007 psin = (struct sockaddr_in *)&ss; 2008 memset(&ss, 0, sizeof(ss)); 2009 psin->sin_family = AF_INET; 2010 psin->sin_addr.s_addr = psl->sl_addr[i]; 2011 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2012 return -EFAULT; 2013 } 2014 return 0; 2015 done: 2016 rtnl_shunlock(); 2017 return err; 2018 } 2019 2020 /* 2021 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2022 */ 2023 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) 2024 { 2025 struct inet_sock *inet = inet_sk(sk); 2026 struct ip_mc_socklist *pmc; 2027 struct ip_sf_socklist *psl; 2028 int i; 2029 2030 if (!MULTICAST(loc_addr)) 2031 return 1; 2032 2033 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2034 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2035 pmc->multi.imr_ifindex == dif) 2036 break; 2037 } 2038 if (!pmc) 2039 return 1; 2040 psl = pmc->sflist; 2041 if (!psl) 2042 return pmc->sfmode == MCAST_EXCLUDE; 2043 2044 for (i=0; i<psl->sl_count; i++) { 2045 if (psl->sl_addr[i] == rmt_addr) 2046 break; 2047 } 2048 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2049 return 0; 2050 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2051 return 0; 2052 return 1; 2053 } 2054 2055 /* 2056 * A socket is closing. 2057 */ 2058 2059 void ip_mc_drop_socket(struct sock *sk) 2060 { 2061 struct inet_sock *inet = inet_sk(sk); 2062 struct ip_mc_socklist *iml; 2063 2064 if (inet->mc_list == NULL) 2065 return; 2066 2067 rtnl_lock(); 2068 while ((iml = inet->mc_list) != NULL) { 2069 struct in_device *in_dev; 2070 inet->mc_list = iml->next; 2071 2072 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { 2073 (void) ip_mc_leave_src(sk, iml, in_dev); 2074 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2075 in_dev_put(in_dev); 2076 } 2077 sock_kfree_s(sk, iml, sizeof(*iml)); 2078 2079 } 2080 rtnl_unlock(); 2081 } 2082 2083 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) 2084 { 2085 struct ip_mc_list *im; 2086 struct ip_sf_list *psf; 2087 int rv = 0; 2088 2089 read_lock(&in_dev->mc_list_lock); 2090 for (im=in_dev->mc_list; im; im=im->next) { 2091 if (im->multiaddr == mc_addr) 2092 break; 2093 } 2094 if (im && proto == IPPROTO_IGMP) { 2095 rv = 1; 2096 } else if (im) { 2097 if (src_addr) { 2098 for (psf=im->sources; psf; psf=psf->sf_next) { 2099 if (psf->sf_inaddr == src_addr) 2100 break; 2101 } 2102 if (psf) 2103 rv = psf->sf_count[MCAST_INCLUDE] || 2104 psf->sf_count[MCAST_EXCLUDE] != 2105 im->sfcount[MCAST_EXCLUDE]; 2106 else 2107 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2108 } else 2109 rv = 1; /* unspecified source; tentatively allow */ 2110 } 2111 read_unlock(&in_dev->mc_list_lock); 2112 return rv; 2113 } 2114 2115 #if defined(CONFIG_PROC_FS) 2116 struct igmp_mc_iter_state { 2117 struct net_device *dev; 2118 struct in_device *in_dev; 2119 }; 2120 2121 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2122 2123 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2124 { 2125 struct ip_mc_list *im = NULL; 2126 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2127 2128 for (state->dev = dev_base, state->in_dev = NULL; 2129 state->dev; 2130 state->dev = state->dev->next) { 2131 struct in_device *in_dev; 2132 in_dev = in_dev_get(state->dev); 2133 if (!in_dev) 2134 continue; 2135 read_lock(&in_dev->mc_list_lock); 2136 im = in_dev->mc_list; 2137 if (im) { 2138 state->in_dev = in_dev; 2139 break; 2140 } 2141 read_unlock(&in_dev->mc_list_lock); 2142 in_dev_put(in_dev); 2143 } 2144 return im; 2145 } 2146 2147 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2148 { 2149 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2150 im = im->next; 2151 while (!im) { 2152 if (likely(state->in_dev != NULL)) { 2153 read_unlock(&state->in_dev->mc_list_lock); 2154 in_dev_put(state->in_dev); 2155 } 2156 state->dev = state->dev->next; 2157 if (!state->dev) { 2158 state->in_dev = NULL; 2159 break; 2160 } 2161 state->in_dev = in_dev_get(state->dev); 2162 if (!state->in_dev) 2163 continue; 2164 read_lock(&state->in_dev->mc_list_lock); 2165 im = state->in_dev->mc_list; 2166 } 2167 return im; 2168 } 2169 2170 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2171 { 2172 struct ip_mc_list *im = igmp_mc_get_first(seq); 2173 if (im) 2174 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2175 --pos; 2176 return pos ? NULL : im; 2177 } 2178 2179 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2180 { 2181 read_lock(&dev_base_lock); 2182 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2183 } 2184 2185 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2186 { 2187 struct ip_mc_list *im; 2188 if (v == SEQ_START_TOKEN) 2189 im = igmp_mc_get_first(seq); 2190 else 2191 im = igmp_mc_get_next(seq, v); 2192 ++*pos; 2193 return im; 2194 } 2195 2196 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2197 { 2198 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2199 if (likely(state->in_dev != NULL)) { 2200 read_unlock(&state->in_dev->mc_list_lock); 2201 in_dev_put(state->in_dev); 2202 state->in_dev = NULL; 2203 } 2204 state->dev = NULL; 2205 read_unlock(&dev_base_lock); 2206 } 2207 2208 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2209 { 2210 if (v == SEQ_START_TOKEN) 2211 seq_puts(seq, 2212 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2213 else { 2214 struct ip_mc_list *im = (struct ip_mc_list *)v; 2215 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2216 char *querier; 2217 #ifdef CONFIG_IP_MULTICAST 2218 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2219 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2220 "V3"; 2221 #else 2222 querier = "NONE"; 2223 #endif 2224 2225 if (state->in_dev->mc_list == im) { 2226 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2227 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2228 } 2229 2230 seq_printf(seq, 2231 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", 2232 im->multiaddr, im->users, 2233 im->tm_running, im->tm_running ? 2234 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2235 im->reporter); 2236 } 2237 return 0; 2238 } 2239 2240 static struct seq_operations igmp_mc_seq_ops = { 2241 .start = igmp_mc_seq_start, 2242 .next = igmp_mc_seq_next, 2243 .stop = igmp_mc_seq_stop, 2244 .show = igmp_mc_seq_show, 2245 }; 2246 2247 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2248 { 2249 struct seq_file *seq; 2250 int rc = -ENOMEM; 2251 struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2252 2253 if (!s) 2254 goto out; 2255 rc = seq_open(file, &igmp_mc_seq_ops); 2256 if (rc) 2257 goto out_kfree; 2258 2259 seq = file->private_data; 2260 seq->private = s; 2261 memset(s, 0, sizeof(*s)); 2262 out: 2263 return rc; 2264 out_kfree: 2265 kfree(s); 2266 goto out; 2267 } 2268 2269 static struct file_operations igmp_mc_seq_fops = { 2270 .owner = THIS_MODULE, 2271 .open = igmp_mc_seq_open, 2272 .read = seq_read, 2273 .llseek = seq_lseek, 2274 .release = seq_release_private, 2275 }; 2276 2277 struct igmp_mcf_iter_state { 2278 struct net_device *dev; 2279 struct in_device *idev; 2280 struct ip_mc_list *im; 2281 }; 2282 2283 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2284 2285 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2286 { 2287 struct ip_sf_list *psf = NULL; 2288 struct ip_mc_list *im = NULL; 2289 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2290 2291 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2292 state->dev; 2293 state->dev = state->dev->next) { 2294 struct in_device *idev; 2295 idev = in_dev_get(state->dev); 2296 if (unlikely(idev == NULL)) 2297 continue; 2298 read_lock(&idev->mc_list_lock); 2299 im = idev->mc_list; 2300 if (likely(im != NULL)) { 2301 spin_lock_bh(&im->lock); 2302 psf = im->sources; 2303 if (likely(psf != NULL)) { 2304 state->im = im; 2305 state->idev = idev; 2306 break; 2307 } 2308 spin_unlock_bh(&im->lock); 2309 } 2310 read_unlock(&idev->mc_list_lock); 2311 in_dev_put(idev); 2312 } 2313 return psf; 2314 } 2315 2316 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2317 { 2318 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2319 2320 psf = psf->sf_next; 2321 while (!psf) { 2322 spin_unlock_bh(&state->im->lock); 2323 state->im = state->im->next; 2324 while (!state->im) { 2325 if (likely(state->idev != NULL)) { 2326 read_unlock(&state->idev->mc_list_lock); 2327 in_dev_put(state->idev); 2328 } 2329 state->dev = state->dev->next; 2330 if (!state->dev) { 2331 state->idev = NULL; 2332 goto out; 2333 } 2334 state->idev = in_dev_get(state->dev); 2335 if (!state->idev) 2336 continue; 2337 read_lock(&state->idev->mc_list_lock); 2338 state->im = state->idev->mc_list; 2339 } 2340 if (!state->im) 2341 break; 2342 spin_lock_bh(&state->im->lock); 2343 psf = state->im->sources; 2344 } 2345 out: 2346 return psf; 2347 } 2348 2349 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2350 { 2351 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2352 if (psf) 2353 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2354 --pos; 2355 return pos ? NULL : psf; 2356 } 2357 2358 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2359 { 2360 read_lock(&dev_base_lock); 2361 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2362 } 2363 2364 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2365 { 2366 struct ip_sf_list *psf; 2367 if (v == SEQ_START_TOKEN) 2368 psf = igmp_mcf_get_first(seq); 2369 else 2370 psf = igmp_mcf_get_next(seq, v); 2371 ++*pos; 2372 return psf; 2373 } 2374 2375 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2376 { 2377 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2378 if (likely(state->im != NULL)) { 2379 spin_unlock_bh(&state->im->lock); 2380 state->im = NULL; 2381 } 2382 if (likely(state->idev != NULL)) { 2383 read_unlock(&state->idev->mc_list_lock); 2384 in_dev_put(state->idev); 2385 state->idev = NULL; 2386 } 2387 state->dev = NULL; 2388 read_unlock(&dev_base_lock); 2389 } 2390 2391 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2392 { 2393 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2394 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2395 2396 if (v == SEQ_START_TOKEN) { 2397 seq_printf(seq, 2398 "%3s %6s " 2399 "%10s %10s %6s %6s\n", "Idx", 2400 "Device", "MCA", 2401 "SRC", "INC", "EXC"); 2402 } else { 2403 seq_printf(seq, 2404 "%3d %6.6s 0x%08x " 2405 "0x%08x %6lu %6lu\n", 2406 state->dev->ifindex, state->dev->name, 2407 ntohl(state->im->multiaddr), 2408 ntohl(psf->sf_inaddr), 2409 psf->sf_count[MCAST_INCLUDE], 2410 psf->sf_count[MCAST_EXCLUDE]); 2411 } 2412 return 0; 2413 } 2414 2415 static struct seq_operations igmp_mcf_seq_ops = { 2416 .start = igmp_mcf_seq_start, 2417 .next = igmp_mcf_seq_next, 2418 .stop = igmp_mcf_seq_stop, 2419 .show = igmp_mcf_seq_show, 2420 }; 2421 2422 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2423 { 2424 struct seq_file *seq; 2425 int rc = -ENOMEM; 2426 struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2427 2428 if (!s) 2429 goto out; 2430 rc = seq_open(file, &igmp_mcf_seq_ops); 2431 if (rc) 2432 goto out_kfree; 2433 2434 seq = file->private_data; 2435 seq->private = s; 2436 memset(s, 0, sizeof(*s)); 2437 out: 2438 return rc; 2439 out_kfree: 2440 kfree(s); 2441 goto out; 2442 } 2443 2444 static struct file_operations igmp_mcf_seq_fops = { 2445 .owner = THIS_MODULE, 2446 .open = igmp_mcf_seq_open, 2447 .read = seq_read, 2448 .llseek = seq_lseek, 2449 .release = seq_release_private, 2450 }; 2451 2452 int __init igmp_mc_proc_init(void) 2453 { 2454 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); 2455 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2456 return 0; 2457 } 2458 #endif 2459 2460 EXPORT_SYMBOL(ip_mc_dec_group); 2461 EXPORT_SYMBOL(ip_mc_inc_group); 2462 EXPORT_SYMBOL(ip_mc_join_group); 2463