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 goto drop; 877 878 switch (skb->ip_summed) { 879 case CHECKSUM_HW: 880 if (!(u16)csum_fold(skb->csum)) 881 break; 882 /* fall through */ 883 case CHECKSUM_NONE: 884 skb->csum = 0; 885 if (__skb_checksum_complete(skb)) 886 goto drop; 887 } 888 889 ih = skb->h.igmph; 890 switch (ih->type) { 891 case IGMP_HOST_MEMBERSHIP_QUERY: 892 igmp_heard_query(in_dev, skb, len); 893 break; 894 case IGMP_HOST_MEMBERSHIP_REPORT: 895 case IGMPV2_HOST_MEMBERSHIP_REPORT: 896 case IGMPV3_HOST_MEMBERSHIP_REPORT: 897 /* Is it our report looped back? */ 898 if (((struct rtable*)skb->dst)->fl.iif == 0) 899 break; 900 /* don't rely on MC router hearing unicast reports */ 901 if (skb->pkt_type == PACKET_MULTICAST || 902 skb->pkt_type == PACKET_BROADCAST) 903 igmp_heard_report(in_dev, ih->group); 904 break; 905 case IGMP_PIM: 906 #ifdef CONFIG_IP_PIMSM_V1 907 in_dev_put(in_dev); 908 return pim_rcv_v1(skb); 909 #endif 910 case IGMP_DVMRP: 911 case IGMP_TRACE: 912 case IGMP_HOST_LEAVE_MESSAGE: 913 case IGMP_MTRACE: 914 case IGMP_MTRACE_RESP: 915 break; 916 default: 917 NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type); 918 } 919 920 drop: 921 in_dev_put(in_dev); 922 kfree_skb(skb); 923 return 0; 924 } 925 926 #endif 927 928 929 /* 930 * Add a filter to a device 931 */ 932 933 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr) 934 { 935 char buf[MAX_ADDR_LEN]; 936 struct net_device *dev = in_dev->dev; 937 938 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 939 We will get multicast token leakage, when IFF_MULTICAST 940 is changed. This check should be done in dev->set_multicast_list 941 routine. Something sort of: 942 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 943 --ANK 944 */ 945 if (arp_mc_map(addr, buf, dev, 0) == 0) 946 dev_mc_add(dev,buf,dev->addr_len,0); 947 } 948 949 /* 950 * Remove a filter from a device 951 */ 952 953 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) 954 { 955 char buf[MAX_ADDR_LEN]; 956 struct net_device *dev = in_dev->dev; 957 958 if (arp_mc_map(addr, buf, dev, 0) == 0) 959 dev_mc_delete(dev,buf,dev->addr_len,0); 960 } 961 962 #ifdef CONFIG_IP_MULTICAST 963 /* 964 * deleted ip_mc_list manipulation 965 */ 966 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 967 { 968 struct ip_mc_list *pmc; 969 970 /* this is an "ip_mc_list" for convenience; only the fields below 971 * are actually used. In particular, the refcnt and users are not 972 * used for management of the delete list. Using the same structure 973 * for deleted items allows change reports to use common code with 974 * non-deleted or query-response MCA's. 975 */ 976 pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL); 977 if (!pmc) 978 return; 979 memset(pmc, 0, sizeof(*pmc)); 980 spin_lock_bh(&im->lock); 981 pmc->interface = im->interface; 982 in_dev_hold(in_dev); 983 pmc->multiaddr = im->multiaddr; 984 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 985 IGMP_Unsolicited_Report_Count; 986 pmc->sfmode = im->sfmode; 987 if (pmc->sfmode == MCAST_INCLUDE) { 988 struct ip_sf_list *psf; 989 990 pmc->tomb = im->tomb; 991 pmc->sources = im->sources; 992 im->tomb = im->sources = NULL; 993 for (psf=pmc->sources; psf; psf=psf->sf_next) 994 psf->sf_crcount = pmc->crcount; 995 } 996 spin_unlock_bh(&im->lock); 997 998 spin_lock_bh(&in_dev->mc_tomb_lock); 999 pmc->next = in_dev->mc_tomb; 1000 in_dev->mc_tomb = pmc; 1001 spin_unlock_bh(&in_dev->mc_tomb_lock); 1002 } 1003 1004 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) 1005 { 1006 struct ip_mc_list *pmc, *pmc_prev; 1007 struct ip_sf_list *psf, *psf_next; 1008 1009 spin_lock_bh(&in_dev->mc_tomb_lock); 1010 pmc_prev = NULL; 1011 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1012 if (pmc->multiaddr == multiaddr) 1013 break; 1014 pmc_prev = pmc; 1015 } 1016 if (pmc) { 1017 if (pmc_prev) 1018 pmc_prev->next = pmc->next; 1019 else 1020 in_dev->mc_tomb = pmc->next; 1021 } 1022 spin_unlock_bh(&in_dev->mc_tomb_lock); 1023 if (pmc) { 1024 for (psf=pmc->tomb; psf; psf=psf_next) { 1025 psf_next = psf->sf_next; 1026 kfree(psf); 1027 } 1028 in_dev_put(pmc->interface); 1029 kfree(pmc); 1030 } 1031 } 1032 1033 static void igmpv3_clear_delrec(struct in_device *in_dev) 1034 { 1035 struct ip_mc_list *pmc, *nextpmc; 1036 1037 spin_lock_bh(&in_dev->mc_tomb_lock); 1038 pmc = in_dev->mc_tomb; 1039 in_dev->mc_tomb = NULL; 1040 spin_unlock_bh(&in_dev->mc_tomb_lock); 1041 1042 for (; pmc; pmc = nextpmc) { 1043 nextpmc = pmc->next; 1044 ip_mc_clear_src(pmc); 1045 in_dev_put(pmc->interface); 1046 kfree(pmc); 1047 } 1048 /* clear dead sources, too */ 1049 read_lock(&in_dev->mc_list_lock); 1050 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1051 struct ip_sf_list *psf, *psf_next; 1052 1053 spin_lock_bh(&pmc->lock); 1054 psf = pmc->tomb; 1055 pmc->tomb = NULL; 1056 spin_unlock_bh(&pmc->lock); 1057 for (; psf; psf=psf_next) { 1058 psf_next = psf->sf_next; 1059 kfree(psf); 1060 } 1061 } 1062 read_unlock(&in_dev->mc_list_lock); 1063 } 1064 #endif 1065 1066 static void igmp_group_dropped(struct ip_mc_list *im) 1067 { 1068 struct in_device *in_dev = im->interface; 1069 #ifdef CONFIG_IP_MULTICAST 1070 int reporter; 1071 #endif 1072 1073 if (im->loaded) { 1074 im->loaded = 0; 1075 ip_mc_filter_del(in_dev, im->multiaddr); 1076 } 1077 1078 #ifdef CONFIG_IP_MULTICAST 1079 if (im->multiaddr == IGMP_ALL_HOSTS) 1080 return; 1081 1082 reporter = im->reporter; 1083 igmp_stop_timer(im); 1084 1085 if (!in_dev->dead) { 1086 if (IGMP_V1_SEEN(in_dev)) 1087 goto done; 1088 if (IGMP_V2_SEEN(in_dev)) { 1089 if (reporter) 1090 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1091 goto done; 1092 } 1093 /* IGMPv3 */ 1094 igmpv3_add_delrec(in_dev, im); 1095 1096 igmp_ifc_event(in_dev); 1097 } 1098 done: 1099 #endif 1100 ip_mc_clear_src(im); 1101 } 1102 1103 static void igmp_group_added(struct ip_mc_list *im) 1104 { 1105 struct in_device *in_dev = im->interface; 1106 1107 if (im->loaded == 0) { 1108 im->loaded = 1; 1109 ip_mc_filter_add(in_dev, im->multiaddr); 1110 } 1111 1112 #ifdef CONFIG_IP_MULTICAST 1113 if (im->multiaddr == IGMP_ALL_HOSTS) 1114 return; 1115 1116 if (in_dev->dead) 1117 return; 1118 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1119 spin_lock_bh(&im->lock); 1120 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1121 spin_unlock_bh(&im->lock); 1122 return; 1123 } 1124 /* else, v3 */ 1125 1126 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1127 IGMP_Unsolicited_Report_Count; 1128 igmp_ifc_event(in_dev); 1129 #endif 1130 } 1131 1132 1133 /* 1134 * Multicast list managers 1135 */ 1136 1137 1138 /* 1139 * A socket has joined a multicast group on device dev. 1140 */ 1141 1142 void ip_mc_inc_group(struct in_device *in_dev, u32 addr) 1143 { 1144 struct ip_mc_list *im; 1145 1146 ASSERT_RTNL(); 1147 1148 for (im=in_dev->mc_list; im; im=im->next) { 1149 if (im->multiaddr == addr) { 1150 im->users++; 1151 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1152 goto out; 1153 } 1154 } 1155 1156 im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL); 1157 if (!im) 1158 goto out; 1159 1160 im->users=1; 1161 im->interface=in_dev; 1162 in_dev_hold(in_dev); 1163 im->multiaddr=addr; 1164 /* initial mode is (EX, empty) */ 1165 im->sfmode = MCAST_EXCLUDE; 1166 im->sfcount[MCAST_INCLUDE] = 0; 1167 im->sfcount[MCAST_EXCLUDE] = 1; 1168 im->sources = NULL; 1169 im->tomb = NULL; 1170 im->crcount = 0; 1171 atomic_set(&im->refcnt, 1); 1172 spin_lock_init(&im->lock); 1173 #ifdef CONFIG_IP_MULTICAST 1174 im->tm_running=0; 1175 init_timer(&im->timer); 1176 im->timer.data=(unsigned long)im; 1177 im->timer.function=&igmp_timer_expire; 1178 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1179 im->reporter = 0; 1180 im->gsquery = 0; 1181 #endif 1182 im->loaded = 0; 1183 write_lock_bh(&in_dev->mc_list_lock); 1184 im->next=in_dev->mc_list; 1185 in_dev->mc_list=im; 1186 write_unlock_bh(&in_dev->mc_list_lock); 1187 #ifdef CONFIG_IP_MULTICAST 1188 igmpv3_del_delrec(in_dev, im->multiaddr); 1189 #endif 1190 igmp_group_added(im); 1191 if (!in_dev->dead) 1192 ip_rt_multicast_event(in_dev); 1193 out: 1194 return; 1195 } 1196 1197 /* 1198 * A socket has left a multicast group on device dev 1199 */ 1200 1201 void ip_mc_dec_group(struct in_device *in_dev, u32 addr) 1202 { 1203 struct ip_mc_list *i, **ip; 1204 1205 ASSERT_RTNL(); 1206 1207 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1208 if (i->multiaddr==addr) { 1209 if (--i->users == 0) { 1210 write_lock_bh(&in_dev->mc_list_lock); 1211 *ip = i->next; 1212 write_unlock_bh(&in_dev->mc_list_lock); 1213 igmp_group_dropped(i); 1214 1215 if (!in_dev->dead) 1216 ip_rt_multicast_event(in_dev); 1217 1218 ip_ma_put(i); 1219 return; 1220 } 1221 break; 1222 } 1223 } 1224 } 1225 1226 /* Device going down */ 1227 1228 void ip_mc_down(struct in_device *in_dev) 1229 { 1230 struct ip_mc_list *i; 1231 1232 ASSERT_RTNL(); 1233 1234 for (i=in_dev->mc_list; i; i=i->next) 1235 igmp_group_dropped(i); 1236 1237 #ifdef CONFIG_IP_MULTICAST 1238 in_dev->mr_ifc_count = 0; 1239 if (del_timer(&in_dev->mr_ifc_timer)) 1240 __in_dev_put(in_dev); 1241 in_dev->mr_gq_running = 0; 1242 if (del_timer(&in_dev->mr_gq_timer)) 1243 __in_dev_put(in_dev); 1244 igmpv3_clear_delrec(in_dev); 1245 #endif 1246 1247 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1248 } 1249 1250 void ip_mc_init_dev(struct in_device *in_dev) 1251 { 1252 ASSERT_RTNL(); 1253 1254 in_dev->mc_tomb = NULL; 1255 #ifdef CONFIG_IP_MULTICAST 1256 in_dev->mr_gq_running = 0; 1257 init_timer(&in_dev->mr_gq_timer); 1258 in_dev->mr_gq_timer.data=(unsigned long) in_dev; 1259 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; 1260 in_dev->mr_ifc_count = 0; 1261 init_timer(&in_dev->mr_ifc_timer); 1262 in_dev->mr_ifc_timer.data=(unsigned long) in_dev; 1263 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; 1264 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1265 #endif 1266 1267 rwlock_init(&in_dev->mc_list_lock); 1268 spin_lock_init(&in_dev->mc_tomb_lock); 1269 } 1270 1271 /* Device going up */ 1272 1273 void ip_mc_up(struct in_device *in_dev) 1274 { 1275 struct ip_mc_list *i; 1276 1277 ASSERT_RTNL(); 1278 1279 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1280 1281 for (i=in_dev->mc_list; i; i=i->next) 1282 igmp_group_added(i); 1283 } 1284 1285 /* 1286 * Device is about to be destroyed: clean up. 1287 */ 1288 1289 void ip_mc_destroy_dev(struct in_device *in_dev) 1290 { 1291 struct ip_mc_list *i; 1292 1293 ASSERT_RTNL(); 1294 1295 /* Deactivate timers */ 1296 ip_mc_down(in_dev); 1297 1298 write_lock_bh(&in_dev->mc_list_lock); 1299 while ((i = in_dev->mc_list) != NULL) { 1300 in_dev->mc_list = i->next; 1301 write_unlock_bh(&in_dev->mc_list_lock); 1302 1303 igmp_group_dropped(i); 1304 ip_ma_put(i); 1305 1306 write_lock_bh(&in_dev->mc_list_lock); 1307 } 1308 write_unlock_bh(&in_dev->mc_list_lock); 1309 } 1310 1311 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1312 { 1313 struct flowi fl = { .nl_u = { .ip4_u = 1314 { .daddr = imr->imr_multiaddr.s_addr } } }; 1315 struct rtable *rt; 1316 struct net_device *dev = NULL; 1317 struct in_device *idev = NULL; 1318 1319 if (imr->imr_ifindex) { 1320 idev = inetdev_by_index(imr->imr_ifindex); 1321 if (idev) 1322 __in_dev_put(idev); 1323 return idev; 1324 } 1325 if (imr->imr_address.s_addr) { 1326 dev = ip_dev_find(imr->imr_address.s_addr); 1327 if (!dev) 1328 return NULL; 1329 __dev_put(dev); 1330 } 1331 1332 if (!dev && !ip_route_output_key(&rt, &fl)) { 1333 dev = rt->u.dst.dev; 1334 ip_rt_put(rt); 1335 } 1336 if (dev) { 1337 imr->imr_ifindex = dev->ifindex; 1338 idev = __in_dev_get_rtnl(dev); 1339 } 1340 return idev; 1341 } 1342 1343 /* 1344 * Join a socket to a group 1345 */ 1346 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; 1347 int sysctl_igmp_max_msf = IP_MAX_MSF; 1348 1349 1350 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1351 __u32 *psfsrc) 1352 { 1353 struct ip_sf_list *psf, *psf_prev; 1354 int rv = 0; 1355 1356 psf_prev = NULL; 1357 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1358 if (psf->sf_inaddr == *psfsrc) 1359 break; 1360 psf_prev = psf; 1361 } 1362 if (!psf || psf->sf_count[sfmode] == 0) { 1363 /* source filter not found, or count wrong => bug */ 1364 return -ESRCH; 1365 } 1366 psf->sf_count[sfmode]--; 1367 if (psf->sf_count[sfmode] == 0) { 1368 ip_rt_multicast_event(pmc->interface); 1369 } 1370 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1371 #ifdef CONFIG_IP_MULTICAST 1372 struct in_device *in_dev = pmc->interface; 1373 #endif 1374 1375 /* no more filters for this source */ 1376 if (psf_prev) 1377 psf_prev->sf_next = psf->sf_next; 1378 else 1379 pmc->sources = psf->sf_next; 1380 #ifdef CONFIG_IP_MULTICAST 1381 if (psf->sf_oldin && 1382 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1383 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1384 IGMP_Unsolicited_Report_Count; 1385 psf->sf_next = pmc->tomb; 1386 pmc->tomb = psf; 1387 rv = 1; 1388 } else 1389 #endif 1390 kfree(psf); 1391 } 1392 return rv; 1393 } 1394 1395 #ifndef CONFIG_IP_MULTICAST 1396 #define igmp_ifc_event(x) do { } while (0) 1397 #endif 1398 1399 static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 1400 int sfcount, __u32 *psfsrc, int delta) 1401 { 1402 struct ip_mc_list *pmc; 1403 int changerec = 0; 1404 int i, err; 1405 1406 if (!in_dev) 1407 return -ENODEV; 1408 read_lock(&in_dev->mc_list_lock); 1409 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1410 if (*pmca == pmc->multiaddr) 1411 break; 1412 } 1413 if (!pmc) { 1414 /* MCA not found?? bug */ 1415 read_unlock(&in_dev->mc_list_lock); 1416 return -ESRCH; 1417 } 1418 spin_lock_bh(&pmc->lock); 1419 read_unlock(&in_dev->mc_list_lock); 1420 #ifdef CONFIG_IP_MULTICAST 1421 sf_markstate(pmc); 1422 #endif 1423 if (!delta) { 1424 err = -EINVAL; 1425 if (!pmc->sfcount[sfmode]) 1426 goto out_unlock; 1427 pmc->sfcount[sfmode]--; 1428 } 1429 err = 0; 1430 for (i=0; i<sfcount; i++) { 1431 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1432 1433 changerec |= rv > 0; 1434 if (!err && rv < 0) 1435 err = rv; 1436 } 1437 if (pmc->sfmode == MCAST_EXCLUDE && 1438 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1439 pmc->sfcount[MCAST_INCLUDE]) { 1440 #ifdef CONFIG_IP_MULTICAST 1441 struct ip_sf_list *psf; 1442 #endif 1443 1444 /* filter mode change */ 1445 pmc->sfmode = MCAST_INCLUDE; 1446 #ifdef CONFIG_IP_MULTICAST 1447 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1448 IGMP_Unsolicited_Report_Count; 1449 in_dev->mr_ifc_count = pmc->crcount; 1450 for (psf=pmc->sources; psf; psf = psf->sf_next) 1451 psf->sf_crcount = 0; 1452 igmp_ifc_event(pmc->interface); 1453 } else if (sf_setstate(pmc) || changerec) { 1454 igmp_ifc_event(pmc->interface); 1455 #endif 1456 } 1457 out_unlock: 1458 spin_unlock_bh(&pmc->lock); 1459 return err; 1460 } 1461 1462 /* 1463 * Add multicast single-source filter to the interface list 1464 */ 1465 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1466 __u32 *psfsrc, int delta) 1467 { 1468 struct ip_sf_list *psf, *psf_prev; 1469 1470 psf_prev = NULL; 1471 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1472 if (psf->sf_inaddr == *psfsrc) 1473 break; 1474 psf_prev = psf; 1475 } 1476 if (!psf) { 1477 psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); 1478 if (!psf) 1479 return -ENOBUFS; 1480 memset(psf, 0, sizeof(*psf)); 1481 psf->sf_inaddr = *psfsrc; 1482 if (psf_prev) { 1483 psf_prev->sf_next = psf; 1484 } else 1485 pmc->sources = psf; 1486 } 1487 psf->sf_count[sfmode]++; 1488 if (psf->sf_count[sfmode] == 1) { 1489 ip_rt_multicast_event(pmc->interface); 1490 } 1491 return 0; 1492 } 1493 1494 #ifdef CONFIG_IP_MULTICAST 1495 static void sf_markstate(struct ip_mc_list *pmc) 1496 { 1497 struct ip_sf_list *psf; 1498 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1499 1500 for (psf=pmc->sources; psf; psf=psf->sf_next) 1501 if (pmc->sfcount[MCAST_EXCLUDE]) { 1502 psf->sf_oldin = mca_xcount == 1503 psf->sf_count[MCAST_EXCLUDE] && 1504 !psf->sf_count[MCAST_INCLUDE]; 1505 } else 1506 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1507 } 1508 1509 static int sf_setstate(struct ip_mc_list *pmc) 1510 { 1511 struct ip_sf_list *psf; 1512 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1513 int qrv = pmc->interface->mr_qrv; 1514 int new_in, rv; 1515 1516 rv = 0; 1517 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1518 if (pmc->sfcount[MCAST_EXCLUDE]) { 1519 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1520 !psf->sf_count[MCAST_INCLUDE]; 1521 } else 1522 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1523 if (new_in != psf->sf_oldin) { 1524 psf->sf_crcount = qrv; 1525 rv++; 1526 } 1527 } 1528 return rv; 1529 } 1530 #endif 1531 1532 /* 1533 * Add multicast source filter list to the interface list 1534 */ 1535 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 1536 int sfcount, __u32 *psfsrc, int delta) 1537 { 1538 struct ip_mc_list *pmc; 1539 int isexclude; 1540 int i, err; 1541 1542 if (!in_dev) 1543 return -ENODEV; 1544 read_lock(&in_dev->mc_list_lock); 1545 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1546 if (*pmca == pmc->multiaddr) 1547 break; 1548 } 1549 if (!pmc) { 1550 /* MCA not found?? bug */ 1551 read_unlock(&in_dev->mc_list_lock); 1552 return -ESRCH; 1553 } 1554 spin_lock_bh(&pmc->lock); 1555 read_unlock(&in_dev->mc_list_lock); 1556 1557 #ifdef CONFIG_IP_MULTICAST 1558 sf_markstate(pmc); 1559 #endif 1560 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1561 if (!delta) 1562 pmc->sfcount[sfmode]++; 1563 err = 0; 1564 for (i=0; i<sfcount; i++) { 1565 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1566 if (err) 1567 break; 1568 } 1569 if (err) { 1570 int j; 1571 1572 pmc->sfcount[sfmode]--; 1573 for (j=0; j<i; j++) 1574 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1575 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1576 #ifdef CONFIG_IP_MULTICAST 1577 struct in_device *in_dev = pmc->interface; 1578 struct ip_sf_list *psf; 1579 #endif 1580 1581 /* filter mode change */ 1582 if (pmc->sfcount[MCAST_EXCLUDE]) 1583 pmc->sfmode = MCAST_EXCLUDE; 1584 else if (pmc->sfcount[MCAST_INCLUDE]) 1585 pmc->sfmode = MCAST_INCLUDE; 1586 #ifdef CONFIG_IP_MULTICAST 1587 /* else no filters; keep old mode for reports */ 1588 1589 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1590 IGMP_Unsolicited_Report_Count; 1591 in_dev->mr_ifc_count = pmc->crcount; 1592 for (psf=pmc->sources; psf; psf = psf->sf_next) 1593 psf->sf_crcount = 0; 1594 igmp_ifc_event(in_dev); 1595 } else if (sf_setstate(pmc)) { 1596 igmp_ifc_event(in_dev); 1597 #endif 1598 } 1599 spin_unlock_bh(&pmc->lock); 1600 return err; 1601 } 1602 1603 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1604 { 1605 struct ip_sf_list *psf, *nextpsf; 1606 1607 for (psf=pmc->tomb; psf; psf=nextpsf) { 1608 nextpsf = psf->sf_next; 1609 kfree(psf); 1610 } 1611 pmc->tomb = NULL; 1612 for (psf=pmc->sources; psf; psf=nextpsf) { 1613 nextpsf = psf->sf_next; 1614 kfree(psf); 1615 } 1616 pmc->sources = NULL; 1617 pmc->sfmode = MCAST_EXCLUDE; 1618 pmc->sfcount[MCAST_INCLUDE] = 0; 1619 pmc->sfcount[MCAST_EXCLUDE] = 1; 1620 } 1621 1622 1623 /* 1624 * Join a multicast group 1625 */ 1626 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1627 { 1628 int err; 1629 u32 addr = imr->imr_multiaddr.s_addr; 1630 struct ip_mc_socklist *iml=NULL, *i; 1631 struct in_device *in_dev; 1632 struct inet_sock *inet = inet_sk(sk); 1633 int ifindex; 1634 int count = 0; 1635 1636 if (!MULTICAST(addr)) 1637 return -EINVAL; 1638 1639 rtnl_shlock(); 1640 1641 in_dev = ip_mc_find_dev(imr); 1642 1643 if (!in_dev) { 1644 iml = NULL; 1645 err = -ENODEV; 1646 goto done; 1647 } 1648 1649 err = -EADDRINUSE; 1650 ifindex = imr->imr_ifindex; 1651 for (i = inet->mc_list; i; i = i->next) { 1652 if (i->multi.imr_multiaddr.s_addr == addr && 1653 i->multi.imr_ifindex == ifindex) 1654 goto done; 1655 count++; 1656 } 1657 err = -ENOBUFS; 1658 if (count >= sysctl_igmp_max_memberships) 1659 goto done; 1660 iml = (struct ip_mc_socklist *)sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1661 if (iml == NULL) 1662 goto done; 1663 1664 memcpy(&iml->multi, imr, sizeof(*imr)); 1665 iml->next = inet->mc_list; 1666 iml->sflist = NULL; 1667 iml->sfmode = MCAST_EXCLUDE; 1668 inet->mc_list = iml; 1669 ip_mc_inc_group(in_dev, addr); 1670 err = 0; 1671 done: 1672 rtnl_shunlock(); 1673 return err; 1674 } 1675 1676 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1677 struct in_device *in_dev) 1678 { 1679 int err; 1680 1681 if (iml->sflist == 0) { 1682 /* any-source empty exclude case */ 1683 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1684 iml->sfmode, 0, NULL, 0); 1685 } 1686 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1687 iml->sfmode, iml->sflist->sl_count, 1688 iml->sflist->sl_addr, 0); 1689 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1690 iml->sflist = NULL; 1691 return err; 1692 } 1693 1694 /* 1695 * Ask a socket to leave a group. 1696 */ 1697 1698 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1699 { 1700 struct inet_sock *inet = inet_sk(sk); 1701 struct ip_mc_socklist *iml, **imlp; 1702 struct in_device *in_dev; 1703 u32 group = imr->imr_multiaddr.s_addr; 1704 u32 ifindex; 1705 1706 rtnl_lock(); 1707 in_dev = ip_mc_find_dev(imr); 1708 if (!in_dev) { 1709 rtnl_unlock(); 1710 return -ENODEV; 1711 } 1712 ifindex = imr->imr_ifindex; 1713 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1714 if (iml->multi.imr_multiaddr.s_addr == group && 1715 iml->multi.imr_ifindex == ifindex) { 1716 (void) ip_mc_leave_src(sk, iml, in_dev); 1717 1718 *imlp = iml->next; 1719 1720 ip_mc_dec_group(in_dev, group); 1721 rtnl_unlock(); 1722 sock_kfree_s(sk, iml, sizeof(*iml)); 1723 return 0; 1724 } 1725 } 1726 rtnl_unlock(); 1727 return -EADDRNOTAVAIL; 1728 } 1729 1730 int ip_mc_source(int add, int omode, struct sock *sk, struct 1731 ip_mreq_source *mreqs, int ifindex) 1732 { 1733 int err; 1734 struct ip_mreqn imr; 1735 u32 addr = mreqs->imr_multiaddr; 1736 struct ip_mc_socklist *pmc; 1737 struct in_device *in_dev = NULL; 1738 struct inet_sock *inet = inet_sk(sk); 1739 struct ip_sf_socklist *psl; 1740 int leavegroup = 0; 1741 int i, j, rv; 1742 1743 if (!MULTICAST(addr)) 1744 return -EINVAL; 1745 1746 rtnl_shlock(); 1747 1748 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1749 imr.imr_address.s_addr = mreqs->imr_interface; 1750 imr.imr_ifindex = ifindex; 1751 in_dev = ip_mc_find_dev(&imr); 1752 1753 if (!in_dev) { 1754 err = -ENODEV; 1755 goto done; 1756 } 1757 err = -EADDRNOTAVAIL; 1758 1759 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1760 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1761 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1762 break; 1763 } 1764 if (!pmc) { /* must have a prior join */ 1765 err = -EINVAL; 1766 goto done; 1767 } 1768 /* if a source filter was set, must be the same mode as before */ 1769 if (pmc->sflist) { 1770 if (pmc->sfmode != omode) { 1771 err = -EINVAL; 1772 goto done; 1773 } 1774 } else if (pmc->sfmode != omode) { 1775 /* allow mode switches for empty-set filters */ 1776 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1777 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1778 NULL, 0); 1779 pmc->sfmode = omode; 1780 } 1781 1782 psl = pmc->sflist; 1783 if (!add) { 1784 if (!psl) 1785 goto done; /* err = -EADDRNOTAVAIL */ 1786 rv = !0; 1787 for (i=0; i<psl->sl_count; i++) { 1788 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1789 sizeof(__u32)); 1790 if (rv == 0) 1791 break; 1792 } 1793 if (rv) /* source not found */ 1794 goto done; /* err = -EADDRNOTAVAIL */ 1795 1796 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1797 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1798 leavegroup = 1; 1799 goto done; 1800 } 1801 1802 /* update the interface filter */ 1803 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1804 &mreqs->imr_sourceaddr, 1); 1805 1806 for (j=i+1; j<psl->sl_count; j++) 1807 psl->sl_addr[j-1] = psl->sl_addr[j]; 1808 psl->sl_count--; 1809 err = 0; 1810 goto done; 1811 } 1812 /* else, add a new source to the filter */ 1813 1814 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1815 err = -ENOBUFS; 1816 goto done; 1817 } 1818 if (!psl || psl->sl_count == psl->sl_max) { 1819 struct ip_sf_socklist *newpsl; 1820 int count = IP_SFBLOCK; 1821 1822 if (psl) 1823 count += psl->sl_max; 1824 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, 1825 IP_SFLSIZE(count), GFP_KERNEL); 1826 if (!newpsl) { 1827 err = -ENOBUFS; 1828 goto done; 1829 } 1830 newpsl->sl_max = count; 1831 newpsl->sl_count = count - IP_SFBLOCK; 1832 if (psl) { 1833 for (i=0; i<psl->sl_count; i++) 1834 newpsl->sl_addr[i] = psl->sl_addr[i]; 1835 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1836 } 1837 pmc->sflist = psl = newpsl; 1838 } 1839 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1840 for (i=0; i<psl->sl_count; i++) { 1841 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1842 sizeof(__u32)); 1843 if (rv == 0) 1844 break; 1845 } 1846 if (rv == 0) /* address already there is an error */ 1847 goto done; 1848 for (j=psl->sl_count-1; j>=i; j--) 1849 psl->sl_addr[j+1] = psl->sl_addr[j]; 1850 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1851 psl->sl_count++; 1852 err = 0; 1853 /* update the interface list */ 1854 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1855 &mreqs->imr_sourceaddr, 1); 1856 done: 1857 rtnl_shunlock(); 1858 if (leavegroup) 1859 return ip_mc_leave_group(sk, &imr); 1860 return err; 1861 } 1862 1863 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1864 { 1865 int err = 0; 1866 struct ip_mreqn imr; 1867 u32 addr = msf->imsf_multiaddr; 1868 struct ip_mc_socklist *pmc; 1869 struct in_device *in_dev; 1870 struct inet_sock *inet = inet_sk(sk); 1871 struct ip_sf_socklist *newpsl, *psl; 1872 int leavegroup = 0; 1873 1874 if (!MULTICAST(addr)) 1875 return -EINVAL; 1876 if (msf->imsf_fmode != MCAST_INCLUDE && 1877 msf->imsf_fmode != MCAST_EXCLUDE) 1878 return -EINVAL; 1879 1880 rtnl_shlock(); 1881 1882 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 1883 imr.imr_address.s_addr = msf->imsf_interface; 1884 imr.imr_ifindex = ifindex; 1885 in_dev = ip_mc_find_dev(&imr); 1886 1887 if (!in_dev) { 1888 err = -ENODEV; 1889 goto done; 1890 } 1891 1892 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1893 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 1894 leavegroup = 1; 1895 goto done; 1896 } 1897 1898 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1899 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 1900 pmc->multi.imr_ifindex == imr.imr_ifindex) 1901 break; 1902 } 1903 if (!pmc) { /* must have a prior join */ 1904 err = -EINVAL; 1905 goto done; 1906 } 1907 if (msf->imsf_numsrc) { 1908 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, 1909 IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL); 1910 if (!newpsl) { 1911 err = -ENOBUFS; 1912 goto done; 1913 } 1914 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 1915 memcpy(newpsl->sl_addr, msf->imsf_slist, 1916 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 1917 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 1918 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 1919 if (err) { 1920 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 1921 goto done; 1922 } 1923 } else { 1924 newpsl = NULL; 1925 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 1926 msf->imsf_fmode, 0, NULL, 0); 1927 } 1928 psl = pmc->sflist; 1929 if (psl) { 1930 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 1931 psl->sl_count, psl->sl_addr, 0); 1932 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1933 } else 1934 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 1935 0, NULL, 0); 1936 pmc->sflist = newpsl; 1937 pmc->sfmode = msf->imsf_fmode; 1938 err = 0; 1939 done: 1940 rtnl_shunlock(); 1941 if (leavegroup) 1942 err = ip_mc_leave_group(sk, &imr); 1943 return err; 1944 } 1945 1946 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 1947 struct ip_msfilter __user *optval, int __user *optlen) 1948 { 1949 int err, len, count, copycount; 1950 struct ip_mreqn imr; 1951 u32 addr = msf->imsf_multiaddr; 1952 struct ip_mc_socklist *pmc; 1953 struct in_device *in_dev; 1954 struct inet_sock *inet = inet_sk(sk); 1955 struct ip_sf_socklist *psl; 1956 1957 if (!MULTICAST(addr)) 1958 return -EINVAL; 1959 1960 rtnl_shlock(); 1961 1962 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 1963 imr.imr_address.s_addr = msf->imsf_interface; 1964 imr.imr_ifindex = 0; 1965 in_dev = ip_mc_find_dev(&imr); 1966 1967 if (!in_dev) { 1968 err = -ENODEV; 1969 goto done; 1970 } 1971 err = -EADDRNOTAVAIL; 1972 1973 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1974 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 1975 pmc->multi.imr_ifindex == imr.imr_ifindex) 1976 break; 1977 } 1978 if (!pmc) /* must have a prior join */ 1979 goto done; 1980 msf->imsf_fmode = pmc->sfmode; 1981 psl = pmc->sflist; 1982 rtnl_shunlock(); 1983 if (!psl) { 1984 len = 0; 1985 count = 0; 1986 } else { 1987 count = psl->sl_count; 1988 } 1989 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 1990 len = copycount * sizeof(psl->sl_addr[0]); 1991 msf->imsf_numsrc = count; 1992 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 1993 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 1994 return -EFAULT; 1995 } 1996 if (len && 1997 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 1998 return -EFAULT; 1999 return 0; 2000 done: 2001 rtnl_shunlock(); 2002 return err; 2003 } 2004 2005 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2006 struct group_filter __user *optval, int __user *optlen) 2007 { 2008 int err, i, count, copycount; 2009 struct sockaddr_in *psin; 2010 u32 addr; 2011 struct ip_mc_socklist *pmc; 2012 struct inet_sock *inet = inet_sk(sk); 2013 struct ip_sf_socklist *psl; 2014 2015 psin = (struct sockaddr_in *)&gsf->gf_group; 2016 if (psin->sin_family != AF_INET) 2017 return -EINVAL; 2018 addr = psin->sin_addr.s_addr; 2019 if (!MULTICAST(addr)) 2020 return -EINVAL; 2021 2022 rtnl_shlock(); 2023 2024 err = -EADDRNOTAVAIL; 2025 2026 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2027 if (pmc->multi.imr_multiaddr.s_addr == addr && 2028 pmc->multi.imr_ifindex == gsf->gf_interface) 2029 break; 2030 } 2031 if (!pmc) /* must have a prior join */ 2032 goto done; 2033 gsf->gf_fmode = pmc->sfmode; 2034 psl = pmc->sflist; 2035 rtnl_shunlock(); 2036 count = psl ? psl->sl_count : 0; 2037 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2038 gsf->gf_numsrc = count; 2039 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2040 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2041 return -EFAULT; 2042 } 2043 for (i=0; i<copycount; i++) { 2044 struct sockaddr_in *psin; 2045 struct sockaddr_storage ss; 2046 2047 psin = (struct sockaddr_in *)&ss; 2048 memset(&ss, 0, sizeof(ss)); 2049 psin->sin_family = AF_INET; 2050 psin->sin_addr.s_addr = psl->sl_addr[i]; 2051 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2052 return -EFAULT; 2053 } 2054 return 0; 2055 done: 2056 rtnl_shunlock(); 2057 return err; 2058 } 2059 2060 /* 2061 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2062 */ 2063 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) 2064 { 2065 struct inet_sock *inet = inet_sk(sk); 2066 struct ip_mc_socklist *pmc; 2067 struct ip_sf_socklist *psl; 2068 int i; 2069 2070 if (!MULTICAST(loc_addr)) 2071 return 1; 2072 2073 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2074 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2075 pmc->multi.imr_ifindex == dif) 2076 break; 2077 } 2078 if (!pmc) 2079 return 1; 2080 psl = pmc->sflist; 2081 if (!psl) 2082 return pmc->sfmode == MCAST_EXCLUDE; 2083 2084 for (i=0; i<psl->sl_count; i++) { 2085 if (psl->sl_addr[i] == rmt_addr) 2086 break; 2087 } 2088 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2089 return 0; 2090 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2091 return 0; 2092 return 1; 2093 } 2094 2095 /* 2096 * A socket is closing. 2097 */ 2098 2099 void ip_mc_drop_socket(struct sock *sk) 2100 { 2101 struct inet_sock *inet = inet_sk(sk); 2102 struct ip_mc_socklist *iml; 2103 2104 if (inet->mc_list == NULL) 2105 return; 2106 2107 rtnl_lock(); 2108 while ((iml = inet->mc_list) != NULL) { 2109 struct in_device *in_dev; 2110 inet->mc_list = iml->next; 2111 2112 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { 2113 (void) ip_mc_leave_src(sk, iml, in_dev); 2114 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2115 in_dev_put(in_dev); 2116 } 2117 sock_kfree_s(sk, iml, sizeof(*iml)); 2118 2119 } 2120 rtnl_unlock(); 2121 } 2122 2123 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) 2124 { 2125 struct ip_mc_list *im; 2126 struct ip_sf_list *psf; 2127 int rv = 0; 2128 2129 read_lock(&in_dev->mc_list_lock); 2130 for (im=in_dev->mc_list; im; im=im->next) { 2131 if (im->multiaddr == mc_addr) 2132 break; 2133 } 2134 if (im && proto == IPPROTO_IGMP) { 2135 rv = 1; 2136 } else if (im) { 2137 if (src_addr) { 2138 for (psf=im->sources; psf; psf=psf->sf_next) { 2139 if (psf->sf_inaddr == src_addr) 2140 break; 2141 } 2142 if (psf) 2143 rv = psf->sf_count[MCAST_INCLUDE] || 2144 psf->sf_count[MCAST_EXCLUDE] != 2145 im->sfcount[MCAST_EXCLUDE]; 2146 else 2147 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2148 } else 2149 rv = 1; /* unspecified source; tentatively allow */ 2150 } 2151 read_unlock(&in_dev->mc_list_lock); 2152 return rv; 2153 } 2154 2155 #if defined(CONFIG_PROC_FS) 2156 struct igmp_mc_iter_state { 2157 struct net_device *dev; 2158 struct in_device *in_dev; 2159 }; 2160 2161 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2162 2163 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2164 { 2165 struct ip_mc_list *im = NULL; 2166 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2167 2168 for (state->dev = dev_base, state->in_dev = NULL; 2169 state->dev; 2170 state->dev = state->dev->next) { 2171 struct in_device *in_dev; 2172 in_dev = in_dev_get(state->dev); 2173 if (!in_dev) 2174 continue; 2175 read_lock(&in_dev->mc_list_lock); 2176 im = in_dev->mc_list; 2177 if (im) { 2178 state->in_dev = in_dev; 2179 break; 2180 } 2181 read_unlock(&in_dev->mc_list_lock); 2182 in_dev_put(in_dev); 2183 } 2184 return im; 2185 } 2186 2187 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2188 { 2189 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2190 im = im->next; 2191 while (!im) { 2192 if (likely(state->in_dev != NULL)) { 2193 read_unlock(&state->in_dev->mc_list_lock); 2194 in_dev_put(state->in_dev); 2195 } 2196 state->dev = state->dev->next; 2197 if (!state->dev) { 2198 state->in_dev = NULL; 2199 break; 2200 } 2201 state->in_dev = in_dev_get(state->dev); 2202 if (!state->in_dev) 2203 continue; 2204 read_lock(&state->in_dev->mc_list_lock); 2205 im = state->in_dev->mc_list; 2206 } 2207 return im; 2208 } 2209 2210 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2211 { 2212 struct ip_mc_list *im = igmp_mc_get_first(seq); 2213 if (im) 2214 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2215 --pos; 2216 return pos ? NULL : im; 2217 } 2218 2219 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2220 { 2221 read_lock(&dev_base_lock); 2222 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2223 } 2224 2225 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2226 { 2227 struct ip_mc_list *im; 2228 if (v == SEQ_START_TOKEN) 2229 im = igmp_mc_get_first(seq); 2230 else 2231 im = igmp_mc_get_next(seq, v); 2232 ++*pos; 2233 return im; 2234 } 2235 2236 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2237 { 2238 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2239 if (likely(state->in_dev != NULL)) { 2240 read_unlock(&state->in_dev->mc_list_lock); 2241 in_dev_put(state->in_dev); 2242 state->in_dev = NULL; 2243 } 2244 state->dev = NULL; 2245 read_unlock(&dev_base_lock); 2246 } 2247 2248 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2249 { 2250 if (v == SEQ_START_TOKEN) 2251 seq_puts(seq, 2252 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2253 else { 2254 struct ip_mc_list *im = (struct ip_mc_list *)v; 2255 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2256 char *querier; 2257 #ifdef CONFIG_IP_MULTICAST 2258 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2259 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2260 "V3"; 2261 #else 2262 querier = "NONE"; 2263 #endif 2264 2265 if (state->in_dev->mc_list == im) { 2266 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2267 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2268 } 2269 2270 seq_printf(seq, 2271 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", 2272 im->multiaddr, im->users, 2273 im->tm_running, im->tm_running ? 2274 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2275 im->reporter); 2276 } 2277 return 0; 2278 } 2279 2280 static struct seq_operations igmp_mc_seq_ops = { 2281 .start = igmp_mc_seq_start, 2282 .next = igmp_mc_seq_next, 2283 .stop = igmp_mc_seq_stop, 2284 .show = igmp_mc_seq_show, 2285 }; 2286 2287 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2288 { 2289 struct seq_file *seq; 2290 int rc = -ENOMEM; 2291 struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2292 2293 if (!s) 2294 goto out; 2295 rc = seq_open(file, &igmp_mc_seq_ops); 2296 if (rc) 2297 goto out_kfree; 2298 2299 seq = file->private_data; 2300 seq->private = s; 2301 memset(s, 0, sizeof(*s)); 2302 out: 2303 return rc; 2304 out_kfree: 2305 kfree(s); 2306 goto out; 2307 } 2308 2309 static struct file_operations igmp_mc_seq_fops = { 2310 .owner = THIS_MODULE, 2311 .open = igmp_mc_seq_open, 2312 .read = seq_read, 2313 .llseek = seq_lseek, 2314 .release = seq_release_private, 2315 }; 2316 2317 struct igmp_mcf_iter_state { 2318 struct net_device *dev; 2319 struct in_device *idev; 2320 struct ip_mc_list *im; 2321 }; 2322 2323 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2324 2325 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2326 { 2327 struct ip_sf_list *psf = NULL; 2328 struct ip_mc_list *im = NULL; 2329 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2330 2331 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2332 state->dev; 2333 state->dev = state->dev->next) { 2334 struct in_device *idev; 2335 idev = in_dev_get(state->dev); 2336 if (unlikely(idev == NULL)) 2337 continue; 2338 read_lock(&idev->mc_list_lock); 2339 im = idev->mc_list; 2340 if (likely(im != NULL)) { 2341 spin_lock_bh(&im->lock); 2342 psf = im->sources; 2343 if (likely(psf != NULL)) { 2344 state->im = im; 2345 state->idev = idev; 2346 break; 2347 } 2348 spin_unlock_bh(&im->lock); 2349 } 2350 read_unlock(&idev->mc_list_lock); 2351 in_dev_put(idev); 2352 } 2353 return psf; 2354 } 2355 2356 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2357 { 2358 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2359 2360 psf = psf->sf_next; 2361 while (!psf) { 2362 spin_unlock_bh(&state->im->lock); 2363 state->im = state->im->next; 2364 while (!state->im) { 2365 if (likely(state->idev != NULL)) { 2366 read_unlock(&state->idev->mc_list_lock); 2367 in_dev_put(state->idev); 2368 } 2369 state->dev = state->dev->next; 2370 if (!state->dev) { 2371 state->idev = NULL; 2372 goto out; 2373 } 2374 state->idev = in_dev_get(state->dev); 2375 if (!state->idev) 2376 continue; 2377 read_lock(&state->idev->mc_list_lock); 2378 state->im = state->idev->mc_list; 2379 } 2380 if (!state->im) 2381 break; 2382 spin_lock_bh(&state->im->lock); 2383 psf = state->im->sources; 2384 } 2385 out: 2386 return psf; 2387 } 2388 2389 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2390 { 2391 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2392 if (psf) 2393 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2394 --pos; 2395 return pos ? NULL : psf; 2396 } 2397 2398 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2399 { 2400 read_lock(&dev_base_lock); 2401 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2402 } 2403 2404 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2405 { 2406 struct ip_sf_list *psf; 2407 if (v == SEQ_START_TOKEN) 2408 psf = igmp_mcf_get_first(seq); 2409 else 2410 psf = igmp_mcf_get_next(seq, v); 2411 ++*pos; 2412 return psf; 2413 } 2414 2415 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2416 { 2417 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2418 if (likely(state->im != NULL)) { 2419 spin_unlock_bh(&state->im->lock); 2420 state->im = NULL; 2421 } 2422 if (likely(state->idev != NULL)) { 2423 read_unlock(&state->idev->mc_list_lock); 2424 in_dev_put(state->idev); 2425 state->idev = NULL; 2426 } 2427 state->dev = NULL; 2428 read_unlock(&dev_base_lock); 2429 } 2430 2431 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2432 { 2433 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2434 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2435 2436 if (v == SEQ_START_TOKEN) { 2437 seq_printf(seq, 2438 "%3s %6s " 2439 "%10s %10s %6s %6s\n", "Idx", 2440 "Device", "MCA", 2441 "SRC", "INC", "EXC"); 2442 } else { 2443 seq_printf(seq, 2444 "%3d %6.6s 0x%08x " 2445 "0x%08x %6lu %6lu\n", 2446 state->dev->ifindex, state->dev->name, 2447 ntohl(state->im->multiaddr), 2448 ntohl(psf->sf_inaddr), 2449 psf->sf_count[MCAST_INCLUDE], 2450 psf->sf_count[MCAST_EXCLUDE]); 2451 } 2452 return 0; 2453 } 2454 2455 static struct seq_operations igmp_mcf_seq_ops = { 2456 .start = igmp_mcf_seq_start, 2457 .next = igmp_mcf_seq_next, 2458 .stop = igmp_mcf_seq_stop, 2459 .show = igmp_mcf_seq_show, 2460 }; 2461 2462 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2463 { 2464 struct seq_file *seq; 2465 int rc = -ENOMEM; 2466 struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 2467 2468 if (!s) 2469 goto out; 2470 rc = seq_open(file, &igmp_mcf_seq_ops); 2471 if (rc) 2472 goto out_kfree; 2473 2474 seq = file->private_data; 2475 seq->private = s; 2476 memset(s, 0, sizeof(*s)); 2477 out: 2478 return rc; 2479 out_kfree: 2480 kfree(s); 2481 goto out; 2482 } 2483 2484 static struct file_operations igmp_mcf_seq_fops = { 2485 .owner = THIS_MODULE, 2486 .open = igmp_mcf_seq_open, 2487 .read = seq_read, 2488 .llseek = seq_lseek, 2489 .release = seq_release_private, 2490 }; 2491 2492 int __init igmp_mc_proc_init(void) 2493 { 2494 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); 2495 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2496 return 0; 2497 } 2498 #endif 2499 2500 EXPORT_SYMBOL(ip_mc_dec_group); 2501 EXPORT_SYMBOL(ip_mc_inc_group); 2502 EXPORT_SYMBOL(ip_mc_join_group); 2503