1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * This code implements the IGMP protocol as defined in RFC1112. There has 5 * been a further revision of this protocol since which is now supported. 6 * 7 * If you have trouble with this module be careful what gcc you have used, 8 * the older version didn't come out right using gcc 2.5.8, the newer one 9 * seems to fall out with gcc 2.6.2. 10 * 11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $ 12 * 13 * Authors: 14 * Alan Cox <Alan.Cox@linux.org> 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License 18 * as published by the Free Software Foundation; either version 19 * 2 of the License, or (at your option) any later version. 20 * 21 * Fixes: 22 * 23 * Alan Cox : Added lots of __inline__ to optimise 24 * the memory usage of all the tiny little 25 * functions. 26 * Alan Cox : Dumped the header building experiment. 27 * Alan Cox : Minor tweaks ready for multicast routing 28 * and extended IGMP protocol. 29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 30 * writes utterly bogus code otherwise (sigh) 31 * fixed IGMP loopback to behave in the manner 32 * desired by mrouted, fixed the fact it has been 33 * broken since 1.3.6 and cleaned up a few minor 34 * points. 35 * 36 * Chih-Jen Chang : Tried to revise IGMP to Version 2 37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 38 * The enhancements are mainly based on Steve Deering's 39 * ipmulti-3.5 source code. 40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 42 * the mrouted version on that device. 43 * Chih-Jen Chang : Added the max_resp_time parameter to 44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 45 * to identify the multicast router version 46 * and do what the IGMP version 2 specified. 47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 48 * Tsu-Sheng Tsao if the specified time expired. 49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 50 * Alan Cox : Use GFP_ATOMIC in the right places. 51 * Christian Daudt : igmp timer wasn't set for local group 52 * memberships but was being deleted, 53 * which caused a "del_timer() called 54 * from %p with timer not initialized\n" 55 * message (960131). 56 * Christian Daudt : removed del_timer from 57 * igmp_timer_expire function (960205). 58 * Christian Daudt : igmp_heard_report now only calls 59 * igmp_timer_expire if tm->running is 60 * true (960216). 61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 62 * igmp_heard_query never trigger. Expiry 63 * miscalculation fixed in igmp_heard_query 64 * and random() made to return unsigned to 65 * prevent negative expiry times. 66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 67 * fix from pending 2.1.x patches. 68 * Alan Cox: Forget to enable FDDI support earlier. 69 * Alexey Kuznetsov: Fixed leaving groups on device down. 70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 71 * David L Stevens: IGMPv3 support, with help from 72 * Vinay Kulkarni 73 */ 74 75 #include <linux/module.h> 76 #include <asm/uaccess.h> 77 #include <asm/system.h> 78 #include <linux/types.h> 79 #include <linux/kernel.h> 80 #include <linux/jiffies.h> 81 #include <linux/string.h> 82 #include <linux/socket.h> 83 #include <linux/sockios.h> 84 #include <linux/in.h> 85 #include <linux/inet.h> 86 #include <linux/netdevice.h> 87 #include <linux/skbuff.h> 88 #include <linux/inetdevice.h> 89 #include <linux/igmp.h> 90 #include <linux/if_arp.h> 91 #include <linux/rtnetlink.h> 92 #include <linux/times.h> 93 94 #include <net/arp.h> 95 #include <net/ip.h> 96 #include <net/protocol.h> 97 #include <net/route.h> 98 #include <net/sock.h> 99 #include <net/checksum.h> 100 #include <linux/netfilter_ipv4.h> 101 #ifdef CONFIG_IP_MROUTE 102 #include <linux/mroute.h> 103 #endif 104 #ifdef CONFIG_PROC_FS 105 #include <linux/proc_fs.h> 106 #include <linux/seq_file.h> 107 #endif 108 109 #define IP_MAX_MEMBERSHIPS 20 110 #define IP_MAX_MSF 10 111 112 #ifdef CONFIG_IP_MULTICAST 113 /* Parameter names and values are taken from igmp-v2-06 draft */ 114 115 #define IGMP_V1_Router_Present_Timeout (400*HZ) 116 #define IGMP_V2_Router_Present_Timeout (400*HZ) 117 #define IGMP_Unsolicited_Report_Interval (10*HZ) 118 #define IGMP_Query_Response_Interval (10*HZ) 119 #define IGMP_Unsolicited_Report_Count 2 120 121 122 #define IGMP_Initial_Report_Delay (1) 123 124 /* IGMP_Initial_Report_Delay is not from IGMP specs! 125 * IGMP specs require to report membership immediately after 126 * joining a group, but we delay the first report by a 127 * small interval. It seems more natural and still does not 128 * contradict to specs provided this delay is small enough. 129 */ 130 131 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \ 132 (in_dev)->cnf.force_igmp_version == 1 || \ 133 ((in_dev)->mr_v1_seen && \ 134 time_before(jiffies, (in_dev)->mr_v1_seen))) 135 #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \ 136 (in_dev)->cnf.force_igmp_version == 2 || \ 137 ((in_dev)->mr_v2_seen && \ 138 time_before(jiffies, (in_dev)->mr_v2_seen))) 139 140 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 141 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr); 142 static void igmpv3_clear_delrec(struct in_device *in_dev); 143 static int sf_setstate(struct ip_mc_list *pmc); 144 static void sf_markstate(struct ip_mc_list *pmc); 145 #endif 146 static void ip_mc_clear_src(struct ip_mc_list *pmc); 147 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 148 int sfcount, __u32 *psfsrc, int delta); 149 150 static void ip_ma_put(struct ip_mc_list *im) 151 { 152 if (atomic_dec_and_test(&im->refcnt)) { 153 in_dev_put(im->interface); 154 kfree(im); 155 } 156 } 157 158 #ifdef CONFIG_IP_MULTICAST 159 160 /* 161 * Timer management 162 */ 163 164 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 165 { 166 spin_lock_bh(&im->lock); 167 if (del_timer(&im->timer)) 168 atomic_dec(&im->refcnt); 169 im->tm_running=0; 170 im->reporter = 0; 171 im->unsolicit_count = 0; 172 spin_unlock_bh(&im->lock); 173 } 174 175 /* It must be called with locked im->lock */ 176 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 177 { 178 int tv=net_random() % max_delay; 179 180 im->tm_running=1; 181 if (!mod_timer(&im->timer, jiffies+tv+2)) 182 atomic_inc(&im->refcnt); 183 } 184 185 static void igmp_gq_start_timer(struct in_device *in_dev) 186 { 187 int tv = net_random() % in_dev->mr_maxdelay; 188 189 in_dev->mr_gq_running = 1; 190 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 191 in_dev_hold(in_dev); 192 } 193 194 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 195 { 196 int tv = net_random() % delay; 197 198 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 199 in_dev_hold(in_dev); 200 } 201 202 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 203 { 204 spin_lock_bh(&im->lock); 205 im->unsolicit_count = 0; 206 if (del_timer(&im->timer)) { 207 if ((long)(im->timer.expires-jiffies) < max_delay) { 208 add_timer(&im->timer); 209 im->tm_running=1; 210 spin_unlock_bh(&im->lock); 211 return; 212 } 213 atomic_dec(&im->refcnt); 214 } 215 igmp_start_timer(im, max_delay); 216 spin_unlock_bh(&im->lock); 217 } 218 219 220 /* 221 * Send an IGMP report. 222 */ 223 224 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 225 226 227 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 228 int gdeleted, int sdeleted) 229 { 230 switch (type) { 231 case IGMPV3_MODE_IS_INCLUDE: 232 case IGMPV3_MODE_IS_EXCLUDE: 233 if (gdeleted || sdeleted) 234 return 0; 235 if (!(pmc->gsquery && !psf->sf_gsresp)) { 236 if (pmc->sfmode == MCAST_INCLUDE) 237 return 1; 238 /* don't include if this source is excluded 239 * in all filters 240 */ 241 if (psf->sf_count[MCAST_INCLUDE]) 242 return type == IGMPV3_MODE_IS_INCLUDE; 243 return pmc->sfcount[MCAST_EXCLUDE] == 244 psf->sf_count[MCAST_EXCLUDE]; 245 } 246 return 0; 247 case IGMPV3_CHANGE_TO_INCLUDE: 248 if (gdeleted || sdeleted) 249 return 0; 250 return psf->sf_count[MCAST_INCLUDE] != 0; 251 case IGMPV3_CHANGE_TO_EXCLUDE: 252 if (gdeleted || sdeleted) 253 return 0; 254 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 255 psf->sf_count[MCAST_INCLUDE]) 256 return 0; 257 return pmc->sfcount[MCAST_EXCLUDE] == 258 psf->sf_count[MCAST_EXCLUDE]; 259 case IGMPV3_ALLOW_NEW_SOURCES: 260 if (gdeleted || !psf->sf_crcount) 261 return 0; 262 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 263 case IGMPV3_BLOCK_OLD_SOURCES: 264 if (pmc->sfmode == MCAST_INCLUDE) 265 return gdeleted || (psf->sf_crcount && sdeleted); 266 return psf->sf_crcount && !gdeleted && !sdeleted; 267 } 268 return 0; 269 } 270 271 static int 272 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 273 { 274 struct ip_sf_list *psf; 275 int scount = 0; 276 277 for (psf=pmc->sources; psf; psf=psf->sf_next) { 278 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 279 continue; 280 scount++; 281 } 282 return scount; 283 } 284 285 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 286 { 287 struct sk_buff *skb; 288 struct rtable *rt; 289 struct iphdr *pip; 290 struct igmpv3_report *pig; 291 292 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); 293 if (skb == NULL) 294 return NULL; 295 296 { 297 struct flowi fl = { .oif = dev->ifindex, 298 .nl_u = { .ip4_u = { 299 .daddr = IGMPV3_ALL_MCR } }, 300 .proto = IPPROTO_IGMP }; 301 if (ip_route_output_key(&rt, &fl)) { 302 kfree_skb(skb); 303 return NULL; 304 } 305 } 306 if (rt->rt_src == 0) { 307 kfree_skb(skb); 308 ip_rt_put(rt); 309 return NULL; 310 } 311 312 skb->dst = &rt->u.dst; 313 skb->dev = dev; 314 315 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 316 317 skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); 318 319 pip->version = 4; 320 pip->ihl = (sizeof(struct iphdr)+4)>>2; 321 pip->tos = 0xc0; 322 pip->frag_off = htons(IP_DF); 323 pip->ttl = 1; 324 pip->daddr = rt->rt_dst; 325 pip->saddr = rt->rt_src; 326 pip->protocol = IPPROTO_IGMP; 327 pip->tot_len = 0; /* filled in later */ 328 ip_select_ident(pip, &rt->u.dst, NULL); 329 ((u8*)&pip[1])[0] = IPOPT_RA; 330 ((u8*)&pip[1])[1] = 4; 331 ((u8*)&pip[1])[2] = 0; 332 ((u8*)&pip[1])[3] = 0; 333 334 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); 335 skb->h.igmph = (struct igmphdr *)pig; 336 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 337 pig->resv1 = 0; 338 pig->csum = 0; 339 pig->resv2 = 0; 340 pig->ngrec = 0; 341 return skb; 342 } 343 344 static int igmpv3_sendpack(struct sk_buff *skb) 345 { 346 struct iphdr *pip = skb->nh.iph; 347 struct igmphdr *pig = skb->h.igmph; 348 int iplen, igmplen; 349 350 iplen = skb->tail - (unsigned char *)skb->nh.iph; 351 pip->tot_len = htons(iplen); 352 ip_send_check(pip); 353 354 igmplen = skb->tail - (unsigned char *)skb->h.igmph; 355 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); 356 357 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, 358 dst_output); 359 } 360 361 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 362 { 363 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 364 } 365 366 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 367 int type, struct igmpv3_grec **ppgr) 368 { 369 struct net_device *dev = pmc->interface->dev; 370 struct igmpv3_report *pih; 371 struct igmpv3_grec *pgr; 372 373 if (!skb) 374 skb = igmpv3_newpack(dev, dev->mtu); 375 if (!skb) 376 return NULL; 377 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 378 pgr->grec_type = type; 379 pgr->grec_auxwords = 0; 380 pgr->grec_nsrcs = 0; 381 pgr->grec_mca = pmc->multiaddr; 382 pih = (struct igmpv3_report *)skb->h.igmph; 383 pih->ngrec = htons(ntohs(pih->ngrec)+1); 384 *ppgr = pgr; 385 return skb; 386 } 387 388 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 389 skb_tailroom(skb)) : 0) 390 391 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 392 int type, int gdeleted, int sdeleted) 393 { 394 struct net_device *dev = pmc->interface->dev; 395 struct igmpv3_report *pih; 396 struct igmpv3_grec *pgr = NULL; 397 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 398 int scount, stotal, first, isquery, truncate; 399 400 if (pmc->multiaddr == IGMP_ALL_HOSTS) 401 return skb; 402 403 isquery = type == IGMPV3_MODE_IS_INCLUDE || 404 type == IGMPV3_MODE_IS_EXCLUDE; 405 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 406 type == IGMPV3_CHANGE_TO_EXCLUDE; 407 408 stotal = scount = 0; 409 410 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 411 412 if (!*psf_list) 413 goto empty_source; 414 415 pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL; 416 417 /* EX and TO_EX get a fresh packet, if needed */ 418 if (truncate) { 419 if (pih && pih->ngrec && 420 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 421 if (skb) 422 igmpv3_sendpack(skb); 423 skb = igmpv3_newpack(dev, dev->mtu); 424 } 425 } 426 first = 1; 427 psf_prev = NULL; 428 for (psf=*psf_list; psf; psf=psf_next) { 429 u32 *psrc; 430 431 psf_next = psf->sf_next; 432 433 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 434 psf_prev = psf; 435 continue; 436 } 437 438 /* clear marks on query responses */ 439 if (isquery) 440 psf->sf_gsresp = 0; 441 442 if (AVAILABLE(skb) < sizeof(u32) + 443 first*sizeof(struct igmpv3_grec)) { 444 if (truncate && !first) 445 break; /* truncate these */ 446 if (pgr) 447 pgr->grec_nsrcs = htons(scount); 448 if (skb) 449 igmpv3_sendpack(skb); 450 skb = igmpv3_newpack(dev, dev->mtu); 451 first = 1; 452 scount = 0; 453 } 454 if (first) { 455 skb = add_grhead(skb, pmc, type, &pgr); 456 first = 0; 457 } 458 psrc = (u32 *)skb_put(skb, sizeof(u32)); 459 *psrc = psf->sf_inaddr; 460 scount++; stotal++; 461 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 462 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 463 psf->sf_crcount--; 464 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 465 if (psf_prev) 466 psf_prev->sf_next = psf->sf_next; 467 else 468 *psf_list = psf->sf_next; 469 kfree(psf); 470 continue; 471 } 472 } 473 psf_prev = psf; 474 } 475 476 empty_source: 477 if (!stotal) { 478 if (type == IGMPV3_ALLOW_NEW_SOURCES || 479 type == IGMPV3_BLOCK_OLD_SOURCES) 480 return skb; 481 if (pmc->crcount || isquery) { 482 /* make sure we have room for group header */ 483 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 484 igmpv3_sendpack(skb); 485 skb = NULL; /* add_grhead will get a new one */ 486 } 487 skb = add_grhead(skb, pmc, type, &pgr); 488 } 489 } 490 if (pgr) 491 pgr->grec_nsrcs = htons(scount); 492 493 if (isquery) 494 pmc->gsquery = 0; /* clear query state on report */ 495 return skb; 496 } 497 498 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 499 { 500 struct sk_buff *skb = NULL; 501 int type; 502 503 if (!pmc) { 504 read_lock(&in_dev->mc_list_lock); 505 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 506 if (pmc->multiaddr == IGMP_ALL_HOSTS) 507 continue; 508 spin_lock_bh(&pmc->lock); 509 if (pmc->sfcount[MCAST_EXCLUDE]) 510 type = IGMPV3_MODE_IS_EXCLUDE; 511 else 512 type = IGMPV3_MODE_IS_INCLUDE; 513 skb = add_grec(skb, pmc, type, 0, 0); 514 spin_unlock_bh(&pmc->lock); 515 } 516 read_unlock(&in_dev->mc_list_lock); 517 } else { 518 spin_lock_bh(&pmc->lock); 519 if (pmc->sfcount[MCAST_EXCLUDE]) 520 type = IGMPV3_MODE_IS_EXCLUDE; 521 else 522 type = IGMPV3_MODE_IS_INCLUDE; 523 skb = add_grec(skb, pmc, type, 0, 0); 524 spin_unlock_bh(&pmc->lock); 525 } 526 if (!skb) 527 return 0; 528 return igmpv3_sendpack(skb); 529 } 530 531 /* 532 * remove zero-count source records from a source filter list 533 */ 534 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 535 { 536 struct ip_sf_list *psf_prev, *psf_next, *psf; 537 538 psf_prev = NULL; 539 for (psf=*ppsf; psf; psf = psf_next) { 540 psf_next = psf->sf_next; 541 if (psf->sf_crcount == 0) { 542 if (psf_prev) 543 psf_prev->sf_next = psf->sf_next; 544 else 545 *ppsf = psf->sf_next; 546 kfree(psf); 547 } else 548 psf_prev = psf; 549 } 550 } 551 552 static void igmpv3_send_cr(struct in_device *in_dev) 553 { 554 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 555 struct sk_buff *skb = NULL; 556 int type, dtype; 557 558 read_lock(&in_dev->mc_list_lock); 559 spin_lock_bh(&in_dev->mc_tomb_lock); 560 561 /* deleted MCA's */ 562 pmc_prev = NULL; 563 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 564 pmc_next = pmc->next; 565 if (pmc->sfmode == MCAST_INCLUDE) { 566 type = IGMPV3_BLOCK_OLD_SOURCES; 567 dtype = IGMPV3_BLOCK_OLD_SOURCES; 568 skb = add_grec(skb, pmc, type, 1, 0); 569 skb = add_grec(skb, pmc, dtype, 1, 1); 570 } 571 if (pmc->crcount) { 572 if (pmc->sfmode == MCAST_EXCLUDE) { 573 type = IGMPV3_CHANGE_TO_INCLUDE; 574 skb = add_grec(skb, pmc, type, 1, 0); 575 } 576 pmc->crcount--; 577 if (pmc->crcount == 0) { 578 igmpv3_clear_zeros(&pmc->tomb); 579 igmpv3_clear_zeros(&pmc->sources); 580 } 581 } 582 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 583 if (pmc_prev) 584 pmc_prev->next = pmc_next; 585 else 586 in_dev->mc_tomb = pmc_next; 587 in_dev_put(pmc->interface); 588 kfree(pmc); 589 } else 590 pmc_prev = pmc; 591 } 592 spin_unlock_bh(&in_dev->mc_tomb_lock); 593 594 /* change recs */ 595 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 596 spin_lock_bh(&pmc->lock); 597 if (pmc->sfcount[MCAST_EXCLUDE]) { 598 type = IGMPV3_BLOCK_OLD_SOURCES; 599 dtype = IGMPV3_ALLOW_NEW_SOURCES; 600 } else { 601 type = IGMPV3_ALLOW_NEW_SOURCES; 602 dtype = IGMPV3_BLOCK_OLD_SOURCES; 603 } 604 skb = add_grec(skb, pmc, type, 0, 0); 605 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 606 607 /* filter mode changes */ 608 if (pmc->crcount) { 609 if (pmc->sfmode == MCAST_EXCLUDE) 610 type = IGMPV3_CHANGE_TO_EXCLUDE; 611 else 612 type = IGMPV3_CHANGE_TO_INCLUDE; 613 skb = add_grec(skb, pmc, type, 0, 0); 614 pmc->crcount--; 615 } 616 spin_unlock_bh(&pmc->lock); 617 } 618 read_unlock(&in_dev->mc_list_lock); 619 620 if (!skb) 621 return; 622 (void) igmpv3_sendpack(skb); 623 } 624 625 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 626 int type) 627 { 628 struct sk_buff *skb; 629 struct iphdr *iph; 630 struct igmphdr *ih; 631 struct rtable *rt; 632 struct net_device *dev = in_dev->dev; 633 u32 group = pmc ? pmc->multiaddr : 0; 634 u32 dst; 635 636 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 637 return igmpv3_send_report(in_dev, pmc); 638 else if (type == IGMP_HOST_LEAVE_MESSAGE) 639 dst = IGMP_ALL_ROUTER; 640 else 641 dst = group; 642 643 { 644 struct flowi fl = { .oif = dev->ifindex, 645 .nl_u = { .ip4_u = { .daddr = dst } }, 646 .proto = IPPROTO_IGMP }; 647 if (ip_route_output_key(&rt, &fl)) 648 return -1; 649 } 650 if (rt->rt_src == 0) { 651 ip_rt_put(rt); 652 return -1; 653 } 654 655 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 656 if (skb == NULL) { 657 ip_rt_put(rt); 658 return -1; 659 } 660 661 skb->dst = &rt->u.dst; 662 663 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 664 665 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); 666 667 iph->version = 4; 668 iph->ihl = (sizeof(struct iphdr)+4)>>2; 669 iph->tos = 0xc0; 670 iph->frag_off = htons(IP_DF); 671 iph->ttl = 1; 672 iph->daddr = dst; 673 iph->saddr = rt->rt_src; 674 iph->protocol = IPPROTO_IGMP; 675 iph->tot_len = htons(IGMP_SIZE); 676 ip_select_ident(iph, &rt->u.dst, NULL); 677 ((u8*)&iph[1])[0] = IPOPT_RA; 678 ((u8*)&iph[1])[1] = 4; 679 ((u8*)&iph[1])[2] = 0; 680 ((u8*)&iph[1])[3] = 0; 681 ip_send_check(iph); 682 683 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 684 ih->type=type; 685 ih->code=0; 686 ih->csum=0; 687 ih->group=group; 688 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 689 690 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 691 dst_output); 692 } 693 694 static void igmp_gq_timer_expire(unsigned long data) 695 { 696 struct in_device *in_dev = (struct in_device *)data; 697 698 in_dev->mr_gq_running = 0; 699 igmpv3_send_report(in_dev, NULL); 700 __in_dev_put(in_dev); 701 } 702 703 static void igmp_ifc_timer_expire(unsigned long data) 704 { 705 struct in_device *in_dev = (struct in_device *)data; 706 707 igmpv3_send_cr(in_dev); 708 if (in_dev->mr_ifc_count) { 709 in_dev->mr_ifc_count--; 710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 711 } 712 __in_dev_put(in_dev); 713 } 714 715 static void igmp_ifc_event(struct in_device *in_dev) 716 { 717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 718 return; 719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 720 IGMP_Unsolicited_Report_Count; 721 igmp_ifc_start_timer(in_dev, 1); 722 } 723 724 725 static void igmp_timer_expire(unsigned long data) 726 { 727 struct ip_mc_list *im=(struct ip_mc_list *)data; 728 struct in_device *in_dev = im->interface; 729 730 spin_lock(&im->lock); 731 im->tm_running=0; 732 733 if (im->unsolicit_count) { 734 im->unsolicit_count--; 735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 736 } 737 im->reporter = 1; 738 spin_unlock(&im->lock); 739 740 if (IGMP_V1_SEEN(in_dev)) 741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 742 else if (IGMP_V2_SEEN(in_dev)) 743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 744 else 745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 746 747 ip_ma_put(im); 748 } 749 750 /* mark EXCLUDE-mode sources */ 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) 752 { 753 struct ip_sf_list *psf; 754 int i, scount; 755 756 scount = 0; 757 for (psf=pmc->sources; psf; psf=psf->sf_next) { 758 if (scount == nsrcs) 759 break; 760 for (i=0; i<nsrcs; i++) { 761 /* skip inactive filters */ 762 if (pmc->sfcount[MCAST_INCLUDE] || 763 pmc->sfcount[MCAST_EXCLUDE] != 764 psf->sf_count[MCAST_EXCLUDE]) 765 continue; 766 if (srcs[i] == psf->sf_inaddr) { 767 scount++; 768 break; 769 } 770 } 771 } 772 pmc->gsquery = 0; 773 if (scount == nsrcs) /* all sources excluded */ 774 return 0; 775 return 1; 776 } 777 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) 779 { 780 struct ip_sf_list *psf; 781 int i, scount; 782 783 if (pmc->sfmode == MCAST_EXCLUDE) 784 return igmp_xmarksources(pmc, nsrcs, srcs); 785 786 /* mark INCLUDE-mode sources */ 787 scount = 0; 788 for (psf=pmc->sources; psf; psf=psf->sf_next) { 789 if (scount == nsrcs) 790 break; 791 for (i=0; i<nsrcs; i++) 792 if (srcs[i] == psf->sf_inaddr) { 793 psf->sf_gsresp = 1; 794 scount++; 795 break; 796 } 797 } 798 if (!scount) { 799 pmc->gsquery = 0; 800 return 0; 801 } 802 pmc->gsquery = 1; 803 return 1; 804 } 805 806 static void igmp_heard_report(struct in_device *in_dev, u32 group) 807 { 808 struct ip_mc_list *im; 809 810 /* Timers are only set for non-local groups */ 811 812 if (group == IGMP_ALL_HOSTS) 813 return; 814 815 read_lock(&in_dev->mc_list_lock); 816 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 817 if (im->multiaddr == group) { 818 igmp_stop_timer(im); 819 break; 820 } 821 } 822 read_unlock(&in_dev->mc_list_lock); 823 } 824 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 826 int len) 827 { 828 struct igmphdr *ih = skb->h.igmph; 829 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; 830 struct ip_mc_list *im; 831 u32 group = ih->group; 832 int max_delay; 833 int mark = 0; 834 835 836 if (len == 8) { 837 if (ih->code == 0) { 838 /* Alas, old v1 router presents here. */ 839 840 max_delay = IGMP_Query_Response_Interval; 841 in_dev->mr_v1_seen = jiffies + 842 IGMP_V1_Router_Present_Timeout; 843 group = 0; 844 } else { 845 /* v2 router present */ 846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 847 in_dev->mr_v2_seen = jiffies + 848 IGMP_V2_Router_Present_Timeout; 849 } 850 /* cancel the interface change timer */ 851 in_dev->mr_ifc_count = 0; 852 if (del_timer(&in_dev->mr_ifc_timer)) 853 __in_dev_put(in_dev); 854 /* clear deleted report items */ 855 igmpv3_clear_delrec(in_dev); 856 } else if (len < 12) { 857 return; /* ignore bogus packet; freed by caller */ 858 } else { /* v3 */ 859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 860 return; 861 862 ih3 = (struct igmpv3_query *) skb->h.raw; 863 if (ih3->nsrcs) { 864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 865 + ntohs(ih3->nsrcs)*sizeof(__u32))) 866 return; 867 ih3 = (struct igmpv3_query *) skb->h.raw; 868 } 869 870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 871 if (!max_delay) 872 max_delay = 1; /* can't mod w/ 0 */ 873 in_dev->mr_maxdelay = max_delay; 874 if (ih3->qrv) 875 in_dev->mr_qrv = ih3->qrv; 876 if (!group) { /* general query */ 877 if (ih3->nsrcs) 878 return; /* no sources allowed */ 879 igmp_gq_start_timer(in_dev); 880 return; 881 } 882 /* mark sources to include, if group & source-specific */ 883 mark = ih3->nsrcs != 0; 884 } 885 886 /* 887 * - Start the timers in all of our membership records 888 * that the query applies to for the interface on 889 * which the query arrived excl. those that belong 890 * to a "local" group (224.0.0.X) 891 * - For timers already running check if they need to 892 * be reset. 893 * - Use the igmp->igmp_code field as the maximum 894 * delay possible 895 */ 896 read_lock(&in_dev->mc_list_lock); 897 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 898 int changed; 899 900 if (group && group != im->multiaddr) 901 continue; 902 if (im->multiaddr == IGMP_ALL_HOSTS) 903 continue; 904 spin_lock_bh(&im->lock); 905 if (im->tm_running) 906 im->gsquery = im->gsquery && mark; 907 else 908 im->gsquery = mark; 909 changed = !im->gsquery || 910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 911 spin_unlock_bh(&im->lock); 912 if (changed) 913 igmp_mod_timer(im, max_delay); 914 } 915 read_unlock(&in_dev->mc_list_lock); 916 } 917 918 int igmp_rcv(struct sk_buff *skb) 919 { 920 /* This basically follows the spec line by line -- see RFC1112 */ 921 struct igmphdr *ih; 922 struct in_device *in_dev = in_dev_get(skb->dev); 923 int len = skb->len; 924 925 if (in_dev==NULL) { 926 kfree_skb(skb); 927 return 0; 928 } 929 930 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 931 goto drop; 932 933 switch (skb->ip_summed) { 934 case CHECKSUM_HW: 935 if (!(u16)csum_fold(skb->csum)) 936 break; 937 /* fall through */ 938 case CHECKSUM_NONE: 939 skb->csum = 0; 940 if (__skb_checksum_complete(skb)) 941 goto drop; 942 } 943 944 ih = skb->h.igmph; 945 switch (ih->type) { 946 case IGMP_HOST_MEMBERSHIP_QUERY: 947 igmp_heard_query(in_dev, skb, len); 948 break; 949 case IGMP_HOST_MEMBERSHIP_REPORT: 950 case IGMPV2_HOST_MEMBERSHIP_REPORT: 951 case IGMPV3_HOST_MEMBERSHIP_REPORT: 952 /* Is it our report looped back? */ 953 if (((struct rtable*)skb->dst)->fl.iif == 0) 954 break; 955 /* don't rely on MC router hearing unicast reports */ 956 if (skb->pkt_type == PACKET_MULTICAST || 957 skb->pkt_type == PACKET_BROADCAST) 958 igmp_heard_report(in_dev, ih->group); 959 break; 960 case IGMP_PIM: 961 #ifdef CONFIG_IP_PIMSM_V1 962 in_dev_put(in_dev); 963 return pim_rcv_v1(skb); 964 #endif 965 case IGMP_DVMRP: 966 case IGMP_TRACE: 967 case IGMP_HOST_LEAVE_MESSAGE: 968 case IGMP_MTRACE: 969 case IGMP_MTRACE_RESP: 970 break; 971 default: 972 break; 973 } 974 975 drop: 976 in_dev_put(in_dev); 977 kfree_skb(skb); 978 return 0; 979 } 980 981 #endif 982 983 984 /* 985 * Add a filter to a device 986 */ 987 988 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr) 989 { 990 char buf[MAX_ADDR_LEN]; 991 struct net_device *dev = in_dev->dev; 992 993 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 994 We will get multicast token leakage, when IFF_MULTICAST 995 is changed. This check should be done in dev->set_multicast_list 996 routine. Something sort of: 997 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 998 --ANK 999 */ 1000 if (arp_mc_map(addr, buf, dev, 0) == 0) 1001 dev_mc_add(dev,buf,dev->addr_len,0); 1002 } 1003 1004 /* 1005 * Remove a filter from a device 1006 */ 1007 1008 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) 1009 { 1010 char buf[MAX_ADDR_LEN]; 1011 struct net_device *dev = in_dev->dev; 1012 1013 if (arp_mc_map(addr, buf, dev, 0) == 0) 1014 dev_mc_delete(dev,buf,dev->addr_len,0); 1015 } 1016 1017 #ifdef CONFIG_IP_MULTICAST 1018 /* 1019 * deleted ip_mc_list manipulation 1020 */ 1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1022 { 1023 struct ip_mc_list *pmc; 1024 1025 /* this is an "ip_mc_list" for convenience; only the fields below 1026 * are actually used. In particular, the refcnt and users are not 1027 * used for management of the delete list. Using the same structure 1028 * for deleted items allows change reports to use common code with 1029 * non-deleted or query-response MCA's. 1030 */ 1031 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1032 if (!pmc) 1033 return; 1034 spin_lock_bh(&im->lock); 1035 pmc->interface = im->interface; 1036 in_dev_hold(in_dev); 1037 pmc->multiaddr = im->multiaddr; 1038 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1039 IGMP_Unsolicited_Report_Count; 1040 pmc->sfmode = im->sfmode; 1041 if (pmc->sfmode == MCAST_INCLUDE) { 1042 struct ip_sf_list *psf; 1043 1044 pmc->tomb = im->tomb; 1045 pmc->sources = im->sources; 1046 im->tomb = im->sources = NULL; 1047 for (psf=pmc->sources; psf; psf=psf->sf_next) 1048 psf->sf_crcount = pmc->crcount; 1049 } 1050 spin_unlock_bh(&im->lock); 1051 1052 spin_lock_bh(&in_dev->mc_tomb_lock); 1053 pmc->next = in_dev->mc_tomb; 1054 in_dev->mc_tomb = pmc; 1055 spin_unlock_bh(&in_dev->mc_tomb_lock); 1056 } 1057 1058 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) 1059 { 1060 struct ip_mc_list *pmc, *pmc_prev; 1061 struct ip_sf_list *psf, *psf_next; 1062 1063 spin_lock_bh(&in_dev->mc_tomb_lock); 1064 pmc_prev = NULL; 1065 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1066 if (pmc->multiaddr == multiaddr) 1067 break; 1068 pmc_prev = pmc; 1069 } 1070 if (pmc) { 1071 if (pmc_prev) 1072 pmc_prev->next = pmc->next; 1073 else 1074 in_dev->mc_tomb = pmc->next; 1075 } 1076 spin_unlock_bh(&in_dev->mc_tomb_lock); 1077 if (pmc) { 1078 for (psf=pmc->tomb; psf; psf=psf_next) { 1079 psf_next = psf->sf_next; 1080 kfree(psf); 1081 } 1082 in_dev_put(pmc->interface); 1083 kfree(pmc); 1084 } 1085 } 1086 1087 static void igmpv3_clear_delrec(struct in_device *in_dev) 1088 { 1089 struct ip_mc_list *pmc, *nextpmc; 1090 1091 spin_lock_bh(&in_dev->mc_tomb_lock); 1092 pmc = in_dev->mc_tomb; 1093 in_dev->mc_tomb = NULL; 1094 spin_unlock_bh(&in_dev->mc_tomb_lock); 1095 1096 for (; pmc; pmc = nextpmc) { 1097 nextpmc = pmc->next; 1098 ip_mc_clear_src(pmc); 1099 in_dev_put(pmc->interface); 1100 kfree(pmc); 1101 } 1102 /* clear dead sources, too */ 1103 read_lock(&in_dev->mc_list_lock); 1104 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1105 struct ip_sf_list *psf, *psf_next; 1106 1107 spin_lock_bh(&pmc->lock); 1108 psf = pmc->tomb; 1109 pmc->tomb = NULL; 1110 spin_unlock_bh(&pmc->lock); 1111 for (; psf; psf=psf_next) { 1112 psf_next = psf->sf_next; 1113 kfree(psf); 1114 } 1115 } 1116 read_unlock(&in_dev->mc_list_lock); 1117 } 1118 #endif 1119 1120 static void igmp_group_dropped(struct ip_mc_list *im) 1121 { 1122 struct in_device *in_dev = im->interface; 1123 #ifdef CONFIG_IP_MULTICAST 1124 int reporter; 1125 #endif 1126 1127 if (im->loaded) { 1128 im->loaded = 0; 1129 ip_mc_filter_del(in_dev, im->multiaddr); 1130 } 1131 1132 #ifdef CONFIG_IP_MULTICAST 1133 if (im->multiaddr == IGMP_ALL_HOSTS) 1134 return; 1135 1136 reporter = im->reporter; 1137 igmp_stop_timer(im); 1138 1139 if (!in_dev->dead) { 1140 if (IGMP_V1_SEEN(in_dev)) 1141 goto done; 1142 if (IGMP_V2_SEEN(in_dev)) { 1143 if (reporter) 1144 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1145 goto done; 1146 } 1147 /* IGMPv3 */ 1148 igmpv3_add_delrec(in_dev, im); 1149 1150 igmp_ifc_event(in_dev); 1151 } 1152 done: 1153 #endif 1154 ip_mc_clear_src(im); 1155 } 1156 1157 static void igmp_group_added(struct ip_mc_list *im) 1158 { 1159 struct in_device *in_dev = im->interface; 1160 1161 if (im->loaded == 0) { 1162 im->loaded = 1; 1163 ip_mc_filter_add(in_dev, im->multiaddr); 1164 } 1165 1166 #ifdef CONFIG_IP_MULTICAST 1167 if (im->multiaddr == IGMP_ALL_HOSTS) 1168 return; 1169 1170 if (in_dev->dead) 1171 return; 1172 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1173 spin_lock_bh(&im->lock); 1174 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1175 spin_unlock_bh(&im->lock); 1176 return; 1177 } 1178 /* else, v3 */ 1179 1180 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1181 IGMP_Unsolicited_Report_Count; 1182 igmp_ifc_event(in_dev); 1183 #endif 1184 } 1185 1186 1187 /* 1188 * Multicast list managers 1189 */ 1190 1191 1192 /* 1193 * A socket has joined a multicast group on device dev. 1194 */ 1195 1196 void ip_mc_inc_group(struct in_device *in_dev, u32 addr) 1197 { 1198 struct ip_mc_list *im; 1199 1200 ASSERT_RTNL(); 1201 1202 for (im=in_dev->mc_list; im; im=im->next) { 1203 if (im->multiaddr == addr) { 1204 im->users++; 1205 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1206 goto out; 1207 } 1208 } 1209 1210 im = kmalloc(sizeof(*im), GFP_KERNEL); 1211 if (!im) 1212 goto out; 1213 1214 im->users=1; 1215 im->interface=in_dev; 1216 in_dev_hold(in_dev); 1217 im->multiaddr=addr; 1218 /* initial mode is (EX, empty) */ 1219 im->sfmode = MCAST_EXCLUDE; 1220 im->sfcount[MCAST_INCLUDE] = 0; 1221 im->sfcount[MCAST_EXCLUDE] = 1; 1222 im->sources = NULL; 1223 im->tomb = NULL; 1224 im->crcount = 0; 1225 atomic_set(&im->refcnt, 1); 1226 spin_lock_init(&im->lock); 1227 #ifdef CONFIG_IP_MULTICAST 1228 im->tm_running=0; 1229 init_timer(&im->timer); 1230 im->timer.data=(unsigned long)im; 1231 im->timer.function=&igmp_timer_expire; 1232 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1233 im->reporter = 0; 1234 im->gsquery = 0; 1235 #endif 1236 im->loaded = 0; 1237 write_lock_bh(&in_dev->mc_list_lock); 1238 im->next=in_dev->mc_list; 1239 in_dev->mc_list=im; 1240 write_unlock_bh(&in_dev->mc_list_lock); 1241 #ifdef CONFIG_IP_MULTICAST 1242 igmpv3_del_delrec(in_dev, im->multiaddr); 1243 #endif 1244 igmp_group_added(im); 1245 if (!in_dev->dead) 1246 ip_rt_multicast_event(in_dev); 1247 out: 1248 return; 1249 } 1250 1251 /* 1252 * A socket has left a multicast group on device dev 1253 */ 1254 1255 void ip_mc_dec_group(struct in_device *in_dev, u32 addr) 1256 { 1257 struct ip_mc_list *i, **ip; 1258 1259 ASSERT_RTNL(); 1260 1261 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1262 if (i->multiaddr==addr) { 1263 if (--i->users == 0) { 1264 write_lock_bh(&in_dev->mc_list_lock); 1265 *ip = i->next; 1266 write_unlock_bh(&in_dev->mc_list_lock); 1267 igmp_group_dropped(i); 1268 1269 if (!in_dev->dead) 1270 ip_rt_multicast_event(in_dev); 1271 1272 ip_ma_put(i); 1273 return; 1274 } 1275 break; 1276 } 1277 } 1278 } 1279 1280 /* Device going down */ 1281 1282 void ip_mc_down(struct in_device *in_dev) 1283 { 1284 struct ip_mc_list *i; 1285 1286 ASSERT_RTNL(); 1287 1288 for (i=in_dev->mc_list; i; i=i->next) 1289 igmp_group_dropped(i); 1290 1291 #ifdef CONFIG_IP_MULTICAST 1292 in_dev->mr_ifc_count = 0; 1293 if (del_timer(&in_dev->mr_ifc_timer)) 1294 __in_dev_put(in_dev); 1295 in_dev->mr_gq_running = 0; 1296 if (del_timer(&in_dev->mr_gq_timer)) 1297 __in_dev_put(in_dev); 1298 igmpv3_clear_delrec(in_dev); 1299 #endif 1300 1301 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1302 } 1303 1304 void ip_mc_init_dev(struct in_device *in_dev) 1305 { 1306 ASSERT_RTNL(); 1307 1308 in_dev->mc_tomb = NULL; 1309 #ifdef CONFIG_IP_MULTICAST 1310 in_dev->mr_gq_running = 0; 1311 init_timer(&in_dev->mr_gq_timer); 1312 in_dev->mr_gq_timer.data=(unsigned long) in_dev; 1313 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; 1314 in_dev->mr_ifc_count = 0; 1315 init_timer(&in_dev->mr_ifc_timer); 1316 in_dev->mr_ifc_timer.data=(unsigned long) in_dev; 1317 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; 1318 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1319 #endif 1320 1321 rwlock_init(&in_dev->mc_list_lock); 1322 spin_lock_init(&in_dev->mc_tomb_lock); 1323 } 1324 1325 /* Device going up */ 1326 1327 void ip_mc_up(struct in_device *in_dev) 1328 { 1329 struct ip_mc_list *i; 1330 1331 ASSERT_RTNL(); 1332 1333 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1334 1335 for (i=in_dev->mc_list; i; i=i->next) 1336 igmp_group_added(i); 1337 } 1338 1339 /* 1340 * Device is about to be destroyed: clean up. 1341 */ 1342 1343 void ip_mc_destroy_dev(struct in_device *in_dev) 1344 { 1345 struct ip_mc_list *i; 1346 1347 ASSERT_RTNL(); 1348 1349 /* Deactivate timers */ 1350 ip_mc_down(in_dev); 1351 1352 write_lock_bh(&in_dev->mc_list_lock); 1353 while ((i = in_dev->mc_list) != NULL) { 1354 in_dev->mc_list = i->next; 1355 write_unlock_bh(&in_dev->mc_list_lock); 1356 1357 igmp_group_dropped(i); 1358 ip_ma_put(i); 1359 1360 write_lock_bh(&in_dev->mc_list_lock); 1361 } 1362 write_unlock_bh(&in_dev->mc_list_lock); 1363 } 1364 1365 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1366 { 1367 struct flowi fl = { .nl_u = { .ip4_u = 1368 { .daddr = imr->imr_multiaddr.s_addr } } }; 1369 struct rtable *rt; 1370 struct net_device *dev = NULL; 1371 struct in_device *idev = NULL; 1372 1373 if (imr->imr_ifindex) { 1374 idev = inetdev_by_index(imr->imr_ifindex); 1375 if (idev) 1376 __in_dev_put(idev); 1377 return idev; 1378 } 1379 if (imr->imr_address.s_addr) { 1380 dev = ip_dev_find(imr->imr_address.s_addr); 1381 if (!dev) 1382 return NULL; 1383 dev_put(dev); 1384 } 1385 1386 if (!dev && !ip_route_output_key(&rt, &fl)) { 1387 dev = rt->u.dst.dev; 1388 ip_rt_put(rt); 1389 } 1390 if (dev) { 1391 imr->imr_ifindex = dev->ifindex; 1392 idev = __in_dev_get_rtnl(dev); 1393 } 1394 return idev; 1395 } 1396 1397 /* 1398 * Join a socket to a group 1399 */ 1400 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; 1401 int sysctl_igmp_max_msf = IP_MAX_MSF; 1402 1403 1404 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1405 __u32 *psfsrc) 1406 { 1407 struct ip_sf_list *psf, *psf_prev; 1408 int rv = 0; 1409 1410 psf_prev = NULL; 1411 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1412 if (psf->sf_inaddr == *psfsrc) 1413 break; 1414 psf_prev = psf; 1415 } 1416 if (!psf || psf->sf_count[sfmode] == 0) { 1417 /* source filter not found, or count wrong => bug */ 1418 return -ESRCH; 1419 } 1420 psf->sf_count[sfmode]--; 1421 if (psf->sf_count[sfmode] == 0) { 1422 ip_rt_multicast_event(pmc->interface); 1423 } 1424 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1425 #ifdef CONFIG_IP_MULTICAST 1426 struct in_device *in_dev = pmc->interface; 1427 #endif 1428 1429 /* no more filters for this source */ 1430 if (psf_prev) 1431 psf_prev->sf_next = psf->sf_next; 1432 else 1433 pmc->sources = psf->sf_next; 1434 #ifdef CONFIG_IP_MULTICAST 1435 if (psf->sf_oldin && 1436 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1437 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1438 IGMP_Unsolicited_Report_Count; 1439 psf->sf_next = pmc->tomb; 1440 pmc->tomb = psf; 1441 rv = 1; 1442 } else 1443 #endif 1444 kfree(psf); 1445 } 1446 return rv; 1447 } 1448 1449 #ifndef CONFIG_IP_MULTICAST 1450 #define igmp_ifc_event(x) do { } while (0) 1451 #endif 1452 1453 static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 1454 int sfcount, __u32 *psfsrc, int delta) 1455 { 1456 struct ip_mc_list *pmc; 1457 int changerec = 0; 1458 int i, err; 1459 1460 if (!in_dev) 1461 return -ENODEV; 1462 read_lock(&in_dev->mc_list_lock); 1463 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1464 if (*pmca == pmc->multiaddr) 1465 break; 1466 } 1467 if (!pmc) { 1468 /* MCA not found?? bug */ 1469 read_unlock(&in_dev->mc_list_lock); 1470 return -ESRCH; 1471 } 1472 spin_lock_bh(&pmc->lock); 1473 read_unlock(&in_dev->mc_list_lock); 1474 #ifdef CONFIG_IP_MULTICAST 1475 sf_markstate(pmc); 1476 #endif 1477 if (!delta) { 1478 err = -EINVAL; 1479 if (!pmc->sfcount[sfmode]) 1480 goto out_unlock; 1481 pmc->sfcount[sfmode]--; 1482 } 1483 err = 0; 1484 for (i=0; i<sfcount; i++) { 1485 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1486 1487 changerec |= rv > 0; 1488 if (!err && rv < 0) 1489 err = rv; 1490 } 1491 if (pmc->sfmode == MCAST_EXCLUDE && 1492 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1493 pmc->sfcount[MCAST_INCLUDE]) { 1494 #ifdef CONFIG_IP_MULTICAST 1495 struct ip_sf_list *psf; 1496 #endif 1497 1498 /* filter mode change */ 1499 pmc->sfmode = MCAST_INCLUDE; 1500 #ifdef CONFIG_IP_MULTICAST 1501 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1502 IGMP_Unsolicited_Report_Count; 1503 in_dev->mr_ifc_count = pmc->crcount; 1504 for (psf=pmc->sources; psf; psf = psf->sf_next) 1505 psf->sf_crcount = 0; 1506 igmp_ifc_event(pmc->interface); 1507 } else if (sf_setstate(pmc) || changerec) { 1508 igmp_ifc_event(pmc->interface); 1509 #endif 1510 } 1511 out_unlock: 1512 spin_unlock_bh(&pmc->lock); 1513 return err; 1514 } 1515 1516 /* 1517 * Add multicast single-source filter to the interface list 1518 */ 1519 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1520 __u32 *psfsrc, int delta) 1521 { 1522 struct ip_sf_list *psf, *psf_prev; 1523 1524 psf_prev = NULL; 1525 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1526 if (psf->sf_inaddr == *psfsrc) 1527 break; 1528 psf_prev = psf; 1529 } 1530 if (!psf) { 1531 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1532 if (!psf) 1533 return -ENOBUFS; 1534 psf->sf_inaddr = *psfsrc; 1535 if (psf_prev) { 1536 psf_prev->sf_next = psf; 1537 } else 1538 pmc->sources = psf; 1539 } 1540 psf->sf_count[sfmode]++; 1541 if (psf->sf_count[sfmode] == 1) { 1542 ip_rt_multicast_event(pmc->interface); 1543 } 1544 return 0; 1545 } 1546 1547 #ifdef CONFIG_IP_MULTICAST 1548 static void sf_markstate(struct ip_mc_list *pmc) 1549 { 1550 struct ip_sf_list *psf; 1551 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1552 1553 for (psf=pmc->sources; psf; psf=psf->sf_next) 1554 if (pmc->sfcount[MCAST_EXCLUDE]) { 1555 psf->sf_oldin = mca_xcount == 1556 psf->sf_count[MCAST_EXCLUDE] && 1557 !psf->sf_count[MCAST_INCLUDE]; 1558 } else 1559 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1560 } 1561 1562 static int sf_setstate(struct ip_mc_list *pmc) 1563 { 1564 struct ip_sf_list *psf, *dpsf; 1565 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1566 int qrv = pmc->interface->mr_qrv; 1567 int new_in, rv; 1568 1569 rv = 0; 1570 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1571 if (pmc->sfcount[MCAST_EXCLUDE]) { 1572 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1573 !psf->sf_count[MCAST_INCLUDE]; 1574 } else 1575 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1576 if (new_in) { 1577 if (!psf->sf_oldin) { 1578 struct ip_sf_list *prev = NULL; 1579 1580 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1581 if (dpsf->sf_inaddr == psf->sf_inaddr) 1582 break; 1583 prev = dpsf; 1584 } 1585 if (dpsf) { 1586 if (prev) 1587 prev->sf_next = dpsf->sf_next; 1588 else 1589 pmc->tomb = dpsf->sf_next; 1590 kfree(dpsf); 1591 } 1592 psf->sf_crcount = qrv; 1593 rv++; 1594 } 1595 } else if (psf->sf_oldin) { 1596 1597 psf->sf_crcount = 0; 1598 /* 1599 * add or update "delete" records if an active filter 1600 * is now inactive 1601 */ 1602 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1603 if (dpsf->sf_inaddr == psf->sf_inaddr) 1604 break; 1605 if (!dpsf) { 1606 dpsf = (struct ip_sf_list *) 1607 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1608 if (!dpsf) 1609 continue; 1610 *dpsf = *psf; 1611 /* pmc->lock held by callers */ 1612 dpsf->sf_next = pmc->tomb; 1613 pmc->tomb = dpsf; 1614 } 1615 dpsf->sf_crcount = qrv; 1616 rv++; 1617 } 1618 } 1619 return rv; 1620 } 1621 #endif 1622 1623 /* 1624 * Add multicast source filter list to the interface list 1625 */ 1626 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, 1627 int sfcount, __u32 *psfsrc, int delta) 1628 { 1629 struct ip_mc_list *pmc; 1630 int isexclude; 1631 int i, err; 1632 1633 if (!in_dev) 1634 return -ENODEV; 1635 read_lock(&in_dev->mc_list_lock); 1636 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1637 if (*pmca == pmc->multiaddr) 1638 break; 1639 } 1640 if (!pmc) { 1641 /* MCA not found?? bug */ 1642 read_unlock(&in_dev->mc_list_lock); 1643 return -ESRCH; 1644 } 1645 spin_lock_bh(&pmc->lock); 1646 read_unlock(&in_dev->mc_list_lock); 1647 1648 #ifdef CONFIG_IP_MULTICAST 1649 sf_markstate(pmc); 1650 #endif 1651 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1652 if (!delta) 1653 pmc->sfcount[sfmode]++; 1654 err = 0; 1655 for (i=0; i<sfcount; i++) { 1656 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1657 if (err) 1658 break; 1659 } 1660 if (err) { 1661 int j; 1662 1663 pmc->sfcount[sfmode]--; 1664 for (j=0; j<i; j++) 1665 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1666 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1667 #ifdef CONFIG_IP_MULTICAST 1668 struct in_device *in_dev = pmc->interface; 1669 struct ip_sf_list *psf; 1670 #endif 1671 1672 /* filter mode change */ 1673 if (pmc->sfcount[MCAST_EXCLUDE]) 1674 pmc->sfmode = MCAST_EXCLUDE; 1675 else if (pmc->sfcount[MCAST_INCLUDE]) 1676 pmc->sfmode = MCAST_INCLUDE; 1677 #ifdef CONFIG_IP_MULTICAST 1678 /* else no filters; keep old mode for reports */ 1679 1680 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1681 IGMP_Unsolicited_Report_Count; 1682 in_dev->mr_ifc_count = pmc->crcount; 1683 for (psf=pmc->sources; psf; psf = psf->sf_next) 1684 psf->sf_crcount = 0; 1685 igmp_ifc_event(in_dev); 1686 } else if (sf_setstate(pmc)) { 1687 igmp_ifc_event(in_dev); 1688 #endif 1689 } 1690 spin_unlock_bh(&pmc->lock); 1691 return err; 1692 } 1693 1694 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1695 { 1696 struct ip_sf_list *psf, *nextpsf; 1697 1698 for (psf=pmc->tomb; psf; psf=nextpsf) { 1699 nextpsf = psf->sf_next; 1700 kfree(psf); 1701 } 1702 pmc->tomb = NULL; 1703 for (psf=pmc->sources; psf; psf=nextpsf) { 1704 nextpsf = psf->sf_next; 1705 kfree(psf); 1706 } 1707 pmc->sources = NULL; 1708 pmc->sfmode = MCAST_EXCLUDE; 1709 pmc->sfcount[MCAST_INCLUDE] = 0; 1710 pmc->sfcount[MCAST_EXCLUDE] = 1; 1711 } 1712 1713 1714 /* 1715 * Join a multicast group 1716 */ 1717 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1718 { 1719 int err; 1720 u32 addr = imr->imr_multiaddr.s_addr; 1721 struct ip_mc_socklist *iml=NULL, *i; 1722 struct in_device *in_dev; 1723 struct inet_sock *inet = inet_sk(sk); 1724 int ifindex; 1725 int count = 0; 1726 1727 if (!MULTICAST(addr)) 1728 return -EINVAL; 1729 1730 rtnl_lock(); 1731 1732 in_dev = ip_mc_find_dev(imr); 1733 1734 if (!in_dev) { 1735 iml = NULL; 1736 err = -ENODEV; 1737 goto done; 1738 } 1739 1740 err = -EADDRINUSE; 1741 ifindex = imr->imr_ifindex; 1742 for (i = inet->mc_list; i; i = i->next) { 1743 if (i->multi.imr_multiaddr.s_addr == addr && 1744 i->multi.imr_ifindex == ifindex) 1745 goto done; 1746 count++; 1747 } 1748 err = -ENOBUFS; 1749 if (count >= sysctl_igmp_max_memberships) 1750 goto done; 1751 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1752 if (iml == NULL) 1753 goto done; 1754 1755 memcpy(&iml->multi, imr, sizeof(*imr)); 1756 iml->next = inet->mc_list; 1757 iml->sflist = NULL; 1758 iml->sfmode = MCAST_EXCLUDE; 1759 inet->mc_list = iml; 1760 ip_mc_inc_group(in_dev, addr); 1761 err = 0; 1762 done: 1763 rtnl_unlock(); 1764 return err; 1765 } 1766 1767 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1768 struct in_device *in_dev) 1769 { 1770 int err; 1771 1772 if (iml->sflist == 0) { 1773 /* any-source empty exclude case */ 1774 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1775 iml->sfmode, 0, NULL, 0); 1776 } 1777 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1778 iml->sfmode, iml->sflist->sl_count, 1779 iml->sflist->sl_addr, 0); 1780 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1781 iml->sflist = NULL; 1782 return err; 1783 } 1784 1785 /* 1786 * Ask a socket to leave a group. 1787 */ 1788 1789 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1790 { 1791 struct inet_sock *inet = inet_sk(sk); 1792 struct ip_mc_socklist *iml, **imlp; 1793 struct in_device *in_dev; 1794 u32 group = imr->imr_multiaddr.s_addr; 1795 u32 ifindex; 1796 int ret = -EADDRNOTAVAIL; 1797 1798 rtnl_lock(); 1799 in_dev = ip_mc_find_dev(imr); 1800 ifindex = imr->imr_ifindex; 1801 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1802 if (iml->multi.imr_multiaddr.s_addr != group) 1803 continue; 1804 if (ifindex) { 1805 if (iml->multi.imr_ifindex != ifindex) 1806 continue; 1807 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1808 iml->multi.imr_address.s_addr) 1809 continue; 1810 1811 (void) ip_mc_leave_src(sk, iml, in_dev); 1812 1813 *imlp = iml->next; 1814 1815 if (in_dev) 1816 ip_mc_dec_group(in_dev, group); 1817 rtnl_unlock(); 1818 sock_kfree_s(sk, iml, sizeof(*iml)); 1819 return 0; 1820 } 1821 if (!in_dev) 1822 ret = -ENODEV; 1823 rtnl_unlock(); 1824 return ret; 1825 } 1826 1827 int ip_mc_source(int add, int omode, struct sock *sk, struct 1828 ip_mreq_source *mreqs, int ifindex) 1829 { 1830 int err; 1831 struct ip_mreqn imr; 1832 u32 addr = mreqs->imr_multiaddr; 1833 struct ip_mc_socklist *pmc; 1834 struct in_device *in_dev = NULL; 1835 struct inet_sock *inet = inet_sk(sk); 1836 struct ip_sf_socklist *psl; 1837 int leavegroup = 0; 1838 int i, j, rv; 1839 1840 if (!MULTICAST(addr)) 1841 return -EINVAL; 1842 1843 rtnl_lock(); 1844 1845 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1846 imr.imr_address.s_addr = mreqs->imr_interface; 1847 imr.imr_ifindex = ifindex; 1848 in_dev = ip_mc_find_dev(&imr); 1849 1850 if (!in_dev) { 1851 err = -ENODEV; 1852 goto done; 1853 } 1854 err = -EADDRNOTAVAIL; 1855 1856 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1857 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1858 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1859 break; 1860 } 1861 if (!pmc) { /* must have a prior join */ 1862 err = -EINVAL; 1863 goto done; 1864 } 1865 /* if a source filter was set, must be the same mode as before */ 1866 if (pmc->sflist) { 1867 if (pmc->sfmode != omode) { 1868 err = -EINVAL; 1869 goto done; 1870 } 1871 } else if (pmc->sfmode != omode) { 1872 /* allow mode switches for empty-set filters */ 1873 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1874 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1875 NULL, 0); 1876 pmc->sfmode = omode; 1877 } 1878 1879 psl = pmc->sflist; 1880 if (!add) { 1881 if (!psl) 1882 goto done; /* err = -EADDRNOTAVAIL */ 1883 rv = !0; 1884 for (i=0; i<psl->sl_count; i++) { 1885 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1886 sizeof(__u32)); 1887 if (rv == 0) 1888 break; 1889 } 1890 if (rv) /* source not found */ 1891 goto done; /* err = -EADDRNOTAVAIL */ 1892 1893 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1894 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1895 leavegroup = 1; 1896 goto done; 1897 } 1898 1899 /* update the interface filter */ 1900 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1901 &mreqs->imr_sourceaddr, 1); 1902 1903 for (j=i+1; j<psl->sl_count; j++) 1904 psl->sl_addr[j-1] = psl->sl_addr[j]; 1905 psl->sl_count--; 1906 err = 0; 1907 goto done; 1908 } 1909 /* else, add a new source to the filter */ 1910 1911 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1912 err = -ENOBUFS; 1913 goto done; 1914 } 1915 if (!psl || psl->sl_count == psl->sl_max) { 1916 struct ip_sf_socklist *newpsl; 1917 int count = IP_SFBLOCK; 1918 1919 if (psl) 1920 count += psl->sl_max; 1921 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1922 if (!newpsl) { 1923 err = -ENOBUFS; 1924 goto done; 1925 } 1926 newpsl->sl_max = count; 1927 newpsl->sl_count = count - IP_SFBLOCK; 1928 if (psl) { 1929 for (i=0; i<psl->sl_count; i++) 1930 newpsl->sl_addr[i] = psl->sl_addr[i]; 1931 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1932 } 1933 pmc->sflist = psl = newpsl; 1934 } 1935 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1936 for (i=0; i<psl->sl_count; i++) { 1937 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1938 sizeof(__u32)); 1939 if (rv == 0) 1940 break; 1941 } 1942 if (rv == 0) /* address already there is an error */ 1943 goto done; 1944 for (j=psl->sl_count-1; j>=i; j--) 1945 psl->sl_addr[j+1] = psl->sl_addr[j]; 1946 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1947 psl->sl_count++; 1948 err = 0; 1949 /* update the interface list */ 1950 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1951 &mreqs->imr_sourceaddr, 1); 1952 done: 1953 rtnl_unlock(); 1954 if (leavegroup) 1955 return ip_mc_leave_group(sk, &imr); 1956 return err; 1957 } 1958 1959 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1960 { 1961 int err = 0; 1962 struct ip_mreqn imr; 1963 u32 addr = msf->imsf_multiaddr; 1964 struct ip_mc_socklist *pmc; 1965 struct in_device *in_dev; 1966 struct inet_sock *inet = inet_sk(sk); 1967 struct ip_sf_socklist *newpsl, *psl; 1968 int leavegroup = 0; 1969 1970 if (!MULTICAST(addr)) 1971 return -EINVAL; 1972 if (msf->imsf_fmode != MCAST_INCLUDE && 1973 msf->imsf_fmode != MCAST_EXCLUDE) 1974 return -EINVAL; 1975 1976 rtnl_lock(); 1977 1978 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 1979 imr.imr_address.s_addr = msf->imsf_interface; 1980 imr.imr_ifindex = ifindex; 1981 in_dev = ip_mc_find_dev(&imr); 1982 1983 if (!in_dev) { 1984 err = -ENODEV; 1985 goto done; 1986 } 1987 1988 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1989 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 1990 leavegroup = 1; 1991 goto done; 1992 } 1993 1994 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1995 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 1996 pmc->multi.imr_ifindex == imr.imr_ifindex) 1997 break; 1998 } 1999 if (!pmc) { /* must have a prior join */ 2000 err = -EINVAL; 2001 goto done; 2002 } 2003 if (msf->imsf_numsrc) { 2004 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2005 GFP_KERNEL); 2006 if (!newpsl) { 2007 err = -ENOBUFS; 2008 goto done; 2009 } 2010 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2011 memcpy(newpsl->sl_addr, msf->imsf_slist, 2012 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2013 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2014 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2015 if (err) { 2016 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2017 goto done; 2018 } 2019 } else { 2020 newpsl = NULL; 2021 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2022 msf->imsf_fmode, 0, NULL, 0); 2023 } 2024 psl = pmc->sflist; 2025 if (psl) { 2026 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2027 psl->sl_count, psl->sl_addr, 0); 2028 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2029 } else 2030 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2031 0, NULL, 0); 2032 pmc->sflist = newpsl; 2033 pmc->sfmode = msf->imsf_fmode; 2034 err = 0; 2035 done: 2036 rtnl_unlock(); 2037 if (leavegroup) 2038 err = ip_mc_leave_group(sk, &imr); 2039 return err; 2040 } 2041 2042 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2043 struct ip_msfilter __user *optval, int __user *optlen) 2044 { 2045 int err, len, count, copycount; 2046 struct ip_mreqn imr; 2047 u32 addr = msf->imsf_multiaddr; 2048 struct ip_mc_socklist *pmc; 2049 struct in_device *in_dev; 2050 struct inet_sock *inet = inet_sk(sk); 2051 struct ip_sf_socklist *psl; 2052 2053 if (!MULTICAST(addr)) 2054 return -EINVAL; 2055 2056 rtnl_lock(); 2057 2058 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2059 imr.imr_address.s_addr = msf->imsf_interface; 2060 imr.imr_ifindex = 0; 2061 in_dev = ip_mc_find_dev(&imr); 2062 2063 if (!in_dev) { 2064 err = -ENODEV; 2065 goto done; 2066 } 2067 err = -EADDRNOTAVAIL; 2068 2069 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2070 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2071 pmc->multi.imr_ifindex == imr.imr_ifindex) 2072 break; 2073 } 2074 if (!pmc) /* must have a prior join */ 2075 goto done; 2076 msf->imsf_fmode = pmc->sfmode; 2077 psl = pmc->sflist; 2078 rtnl_unlock(); 2079 if (!psl) { 2080 len = 0; 2081 count = 0; 2082 } else { 2083 count = psl->sl_count; 2084 } 2085 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2086 len = copycount * sizeof(psl->sl_addr[0]); 2087 msf->imsf_numsrc = count; 2088 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2089 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2090 return -EFAULT; 2091 } 2092 if (len && 2093 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2094 return -EFAULT; 2095 return 0; 2096 done: 2097 rtnl_unlock(); 2098 return err; 2099 } 2100 2101 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2102 struct group_filter __user *optval, int __user *optlen) 2103 { 2104 int err, i, count, copycount; 2105 struct sockaddr_in *psin; 2106 u32 addr; 2107 struct ip_mc_socklist *pmc; 2108 struct inet_sock *inet = inet_sk(sk); 2109 struct ip_sf_socklist *psl; 2110 2111 psin = (struct sockaddr_in *)&gsf->gf_group; 2112 if (psin->sin_family != AF_INET) 2113 return -EINVAL; 2114 addr = psin->sin_addr.s_addr; 2115 if (!MULTICAST(addr)) 2116 return -EINVAL; 2117 2118 rtnl_lock(); 2119 2120 err = -EADDRNOTAVAIL; 2121 2122 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2123 if (pmc->multi.imr_multiaddr.s_addr == addr && 2124 pmc->multi.imr_ifindex == gsf->gf_interface) 2125 break; 2126 } 2127 if (!pmc) /* must have a prior join */ 2128 goto done; 2129 gsf->gf_fmode = pmc->sfmode; 2130 psl = pmc->sflist; 2131 rtnl_unlock(); 2132 count = psl ? psl->sl_count : 0; 2133 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2134 gsf->gf_numsrc = count; 2135 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2136 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2137 return -EFAULT; 2138 } 2139 for (i=0; i<copycount; i++) { 2140 struct sockaddr_in *psin; 2141 struct sockaddr_storage ss; 2142 2143 psin = (struct sockaddr_in *)&ss; 2144 memset(&ss, 0, sizeof(ss)); 2145 psin->sin_family = AF_INET; 2146 psin->sin_addr.s_addr = psl->sl_addr[i]; 2147 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2148 return -EFAULT; 2149 } 2150 return 0; 2151 done: 2152 rtnl_unlock(); 2153 return err; 2154 } 2155 2156 /* 2157 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2158 */ 2159 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) 2160 { 2161 struct inet_sock *inet = inet_sk(sk); 2162 struct ip_mc_socklist *pmc; 2163 struct ip_sf_socklist *psl; 2164 int i; 2165 2166 if (!MULTICAST(loc_addr)) 2167 return 1; 2168 2169 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2170 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2171 pmc->multi.imr_ifindex == dif) 2172 break; 2173 } 2174 if (!pmc) 2175 return 1; 2176 psl = pmc->sflist; 2177 if (!psl) 2178 return pmc->sfmode == MCAST_EXCLUDE; 2179 2180 for (i=0; i<psl->sl_count; i++) { 2181 if (psl->sl_addr[i] == rmt_addr) 2182 break; 2183 } 2184 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2185 return 0; 2186 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2187 return 0; 2188 return 1; 2189 } 2190 2191 /* 2192 * A socket is closing. 2193 */ 2194 2195 void ip_mc_drop_socket(struct sock *sk) 2196 { 2197 struct inet_sock *inet = inet_sk(sk); 2198 struct ip_mc_socklist *iml; 2199 2200 if (inet->mc_list == NULL) 2201 return; 2202 2203 rtnl_lock(); 2204 while ((iml = inet->mc_list) != NULL) { 2205 struct in_device *in_dev; 2206 inet->mc_list = iml->next; 2207 2208 in_dev = inetdev_by_index(iml->multi.imr_ifindex); 2209 (void) ip_mc_leave_src(sk, iml, in_dev); 2210 if (in_dev != NULL) { 2211 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2212 in_dev_put(in_dev); 2213 } 2214 sock_kfree_s(sk, iml, sizeof(*iml)); 2215 } 2216 rtnl_unlock(); 2217 } 2218 2219 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) 2220 { 2221 struct ip_mc_list *im; 2222 struct ip_sf_list *psf; 2223 int rv = 0; 2224 2225 read_lock(&in_dev->mc_list_lock); 2226 for (im=in_dev->mc_list; im; im=im->next) { 2227 if (im->multiaddr == mc_addr) 2228 break; 2229 } 2230 if (im && proto == IPPROTO_IGMP) { 2231 rv = 1; 2232 } else if (im) { 2233 if (src_addr) { 2234 for (psf=im->sources; psf; psf=psf->sf_next) { 2235 if (psf->sf_inaddr == src_addr) 2236 break; 2237 } 2238 if (psf) 2239 rv = psf->sf_count[MCAST_INCLUDE] || 2240 psf->sf_count[MCAST_EXCLUDE] != 2241 im->sfcount[MCAST_EXCLUDE]; 2242 else 2243 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2244 } else 2245 rv = 1; /* unspecified source; tentatively allow */ 2246 } 2247 read_unlock(&in_dev->mc_list_lock); 2248 return rv; 2249 } 2250 2251 #if defined(CONFIG_PROC_FS) 2252 struct igmp_mc_iter_state { 2253 struct net_device *dev; 2254 struct in_device *in_dev; 2255 }; 2256 2257 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2258 2259 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2260 { 2261 struct ip_mc_list *im = NULL; 2262 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2263 2264 for (state->dev = dev_base, state->in_dev = NULL; 2265 state->dev; 2266 state->dev = state->dev->next) { 2267 struct in_device *in_dev; 2268 in_dev = in_dev_get(state->dev); 2269 if (!in_dev) 2270 continue; 2271 read_lock(&in_dev->mc_list_lock); 2272 im = in_dev->mc_list; 2273 if (im) { 2274 state->in_dev = in_dev; 2275 break; 2276 } 2277 read_unlock(&in_dev->mc_list_lock); 2278 in_dev_put(in_dev); 2279 } 2280 return im; 2281 } 2282 2283 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2284 { 2285 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2286 im = im->next; 2287 while (!im) { 2288 if (likely(state->in_dev != NULL)) { 2289 read_unlock(&state->in_dev->mc_list_lock); 2290 in_dev_put(state->in_dev); 2291 } 2292 state->dev = state->dev->next; 2293 if (!state->dev) { 2294 state->in_dev = NULL; 2295 break; 2296 } 2297 state->in_dev = in_dev_get(state->dev); 2298 if (!state->in_dev) 2299 continue; 2300 read_lock(&state->in_dev->mc_list_lock); 2301 im = state->in_dev->mc_list; 2302 } 2303 return im; 2304 } 2305 2306 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2307 { 2308 struct ip_mc_list *im = igmp_mc_get_first(seq); 2309 if (im) 2310 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2311 --pos; 2312 return pos ? NULL : im; 2313 } 2314 2315 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2316 { 2317 read_lock(&dev_base_lock); 2318 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2319 } 2320 2321 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2322 { 2323 struct ip_mc_list *im; 2324 if (v == SEQ_START_TOKEN) 2325 im = igmp_mc_get_first(seq); 2326 else 2327 im = igmp_mc_get_next(seq, v); 2328 ++*pos; 2329 return im; 2330 } 2331 2332 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2333 { 2334 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2335 if (likely(state->in_dev != NULL)) { 2336 read_unlock(&state->in_dev->mc_list_lock); 2337 in_dev_put(state->in_dev); 2338 state->in_dev = NULL; 2339 } 2340 state->dev = NULL; 2341 read_unlock(&dev_base_lock); 2342 } 2343 2344 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2345 { 2346 if (v == SEQ_START_TOKEN) 2347 seq_puts(seq, 2348 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2349 else { 2350 struct ip_mc_list *im = (struct ip_mc_list *)v; 2351 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2352 char *querier; 2353 #ifdef CONFIG_IP_MULTICAST 2354 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2355 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2356 "V3"; 2357 #else 2358 querier = "NONE"; 2359 #endif 2360 2361 if (state->in_dev->mc_list == im) { 2362 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2363 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2364 } 2365 2366 seq_printf(seq, 2367 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2368 im->multiaddr, im->users, 2369 im->tm_running, im->tm_running ? 2370 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2371 im->reporter); 2372 } 2373 return 0; 2374 } 2375 2376 static struct seq_operations igmp_mc_seq_ops = { 2377 .start = igmp_mc_seq_start, 2378 .next = igmp_mc_seq_next, 2379 .stop = igmp_mc_seq_stop, 2380 .show = igmp_mc_seq_show, 2381 }; 2382 2383 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2384 { 2385 struct seq_file *seq; 2386 int rc = -ENOMEM; 2387 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2388 2389 if (!s) 2390 goto out; 2391 rc = seq_open(file, &igmp_mc_seq_ops); 2392 if (rc) 2393 goto out_kfree; 2394 2395 seq = file->private_data; 2396 seq->private = s; 2397 out: 2398 return rc; 2399 out_kfree: 2400 kfree(s); 2401 goto out; 2402 } 2403 2404 static struct file_operations igmp_mc_seq_fops = { 2405 .owner = THIS_MODULE, 2406 .open = igmp_mc_seq_open, 2407 .read = seq_read, 2408 .llseek = seq_lseek, 2409 .release = seq_release_private, 2410 }; 2411 2412 struct igmp_mcf_iter_state { 2413 struct net_device *dev; 2414 struct in_device *idev; 2415 struct ip_mc_list *im; 2416 }; 2417 2418 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2419 2420 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2421 { 2422 struct ip_sf_list *psf = NULL; 2423 struct ip_mc_list *im = NULL; 2424 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2425 2426 for (state->dev = dev_base, state->idev = NULL, state->im = NULL; 2427 state->dev; 2428 state->dev = state->dev->next) { 2429 struct in_device *idev; 2430 idev = in_dev_get(state->dev); 2431 if (unlikely(idev == NULL)) 2432 continue; 2433 read_lock(&idev->mc_list_lock); 2434 im = idev->mc_list; 2435 if (likely(im != NULL)) { 2436 spin_lock_bh(&im->lock); 2437 psf = im->sources; 2438 if (likely(psf != NULL)) { 2439 state->im = im; 2440 state->idev = idev; 2441 break; 2442 } 2443 spin_unlock_bh(&im->lock); 2444 } 2445 read_unlock(&idev->mc_list_lock); 2446 in_dev_put(idev); 2447 } 2448 return psf; 2449 } 2450 2451 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2452 { 2453 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2454 2455 psf = psf->sf_next; 2456 while (!psf) { 2457 spin_unlock_bh(&state->im->lock); 2458 state->im = state->im->next; 2459 while (!state->im) { 2460 if (likely(state->idev != NULL)) { 2461 read_unlock(&state->idev->mc_list_lock); 2462 in_dev_put(state->idev); 2463 } 2464 state->dev = state->dev->next; 2465 if (!state->dev) { 2466 state->idev = NULL; 2467 goto out; 2468 } 2469 state->idev = in_dev_get(state->dev); 2470 if (!state->idev) 2471 continue; 2472 read_lock(&state->idev->mc_list_lock); 2473 state->im = state->idev->mc_list; 2474 } 2475 if (!state->im) 2476 break; 2477 spin_lock_bh(&state->im->lock); 2478 psf = state->im->sources; 2479 } 2480 out: 2481 return psf; 2482 } 2483 2484 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2485 { 2486 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2487 if (psf) 2488 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2489 --pos; 2490 return pos ? NULL : psf; 2491 } 2492 2493 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2494 { 2495 read_lock(&dev_base_lock); 2496 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2497 } 2498 2499 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2500 { 2501 struct ip_sf_list *psf; 2502 if (v == SEQ_START_TOKEN) 2503 psf = igmp_mcf_get_first(seq); 2504 else 2505 psf = igmp_mcf_get_next(seq, v); 2506 ++*pos; 2507 return psf; 2508 } 2509 2510 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2511 { 2512 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2513 if (likely(state->im != NULL)) { 2514 spin_unlock_bh(&state->im->lock); 2515 state->im = NULL; 2516 } 2517 if (likely(state->idev != NULL)) { 2518 read_unlock(&state->idev->mc_list_lock); 2519 in_dev_put(state->idev); 2520 state->idev = NULL; 2521 } 2522 state->dev = NULL; 2523 read_unlock(&dev_base_lock); 2524 } 2525 2526 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2527 { 2528 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2529 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2530 2531 if (v == SEQ_START_TOKEN) { 2532 seq_printf(seq, 2533 "%3s %6s " 2534 "%10s %10s %6s %6s\n", "Idx", 2535 "Device", "MCA", 2536 "SRC", "INC", "EXC"); 2537 } else { 2538 seq_printf(seq, 2539 "%3d %6.6s 0x%08x " 2540 "0x%08x %6lu %6lu\n", 2541 state->dev->ifindex, state->dev->name, 2542 ntohl(state->im->multiaddr), 2543 ntohl(psf->sf_inaddr), 2544 psf->sf_count[MCAST_INCLUDE], 2545 psf->sf_count[MCAST_EXCLUDE]); 2546 } 2547 return 0; 2548 } 2549 2550 static struct seq_operations igmp_mcf_seq_ops = { 2551 .start = igmp_mcf_seq_start, 2552 .next = igmp_mcf_seq_next, 2553 .stop = igmp_mcf_seq_stop, 2554 .show = igmp_mcf_seq_show, 2555 }; 2556 2557 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2558 { 2559 struct seq_file *seq; 2560 int rc = -ENOMEM; 2561 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); 2562 2563 if (!s) 2564 goto out; 2565 rc = seq_open(file, &igmp_mcf_seq_ops); 2566 if (rc) 2567 goto out_kfree; 2568 2569 seq = file->private_data; 2570 seq->private = s; 2571 out: 2572 return rc; 2573 out_kfree: 2574 kfree(s); 2575 goto out; 2576 } 2577 2578 static struct file_operations igmp_mcf_seq_fops = { 2579 .owner = THIS_MODULE, 2580 .open = igmp_mcf_seq_open, 2581 .read = seq_read, 2582 .llseek = seq_lseek, 2583 .release = seq_release_private, 2584 }; 2585 2586 int __init igmp_mc_proc_init(void) 2587 { 2588 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); 2589 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2590 return 0; 2591 } 2592 #endif 2593 2594 EXPORT_SYMBOL(ip_mc_dec_group); 2595 EXPORT_SYMBOL(ip_mc_inc_group); 2596 EXPORT_SYMBOL(ip_mc_join_group); 2597