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/net_namespace.h> 95 #include <net/arp.h> 96 #include <net/ip.h> 97 #include <net/protocol.h> 98 #include <net/route.h> 99 #include <net/sock.h> 100 #include <net/checksum.h> 101 #include <linux/netfilter_ipv4.h> 102 #ifdef CONFIG_IP_MROUTE 103 #include <linux/mroute.h> 104 #endif 105 #ifdef CONFIG_PROC_FS 106 #include <linux/proc_fs.h> 107 #include <linux/seq_file.h> 108 #endif 109 110 #define IP_MAX_MEMBERSHIPS 20 111 #define IP_MAX_MSF 10 112 113 #ifdef CONFIG_IP_MULTICAST 114 /* Parameter names and values are taken from igmp-v2-06 draft */ 115 116 #define IGMP_V1_Router_Present_Timeout (400*HZ) 117 #define IGMP_V2_Router_Present_Timeout (400*HZ) 118 #define IGMP_Unsolicited_Report_Interval (10*HZ) 119 #define IGMP_Query_Response_Interval (10*HZ) 120 #define IGMP_Unsolicited_Report_Count 2 121 122 123 #define IGMP_Initial_Report_Delay (1) 124 125 /* IGMP_Initial_Report_Delay is not from IGMP specs! 126 * IGMP specs require to report membership immediately after 127 * joining a group, but we delay the first report by a 128 * small interval. It seems more natural and still does not 129 * contradict to specs provided this delay is small enough. 130 */ 131 132 #define IGMP_V1_SEEN(in_dev) \ 133 (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 1 || \ 134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 135 ((in_dev)->mr_v1_seen && \ 136 time_before(jiffies, (in_dev)->mr_v1_seen))) 137 #define IGMP_V2_SEEN(in_dev) \ 138 (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 2 || \ 139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 140 ((in_dev)->mr_v2_seen && \ 141 time_before(jiffies, (in_dev)->mr_v2_seen))) 142 143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 145 static void igmpv3_clear_delrec(struct in_device *in_dev); 146 static int sf_setstate(struct ip_mc_list *pmc); 147 static void sf_markstate(struct ip_mc_list *pmc); 148 #endif 149 static void ip_mc_clear_src(struct ip_mc_list *pmc); 150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 151 int sfcount, __be32 *psfsrc, int delta); 152 153 static void ip_ma_put(struct ip_mc_list *im) 154 { 155 if (atomic_dec_and_test(&im->refcnt)) { 156 in_dev_put(im->interface); 157 kfree(im); 158 } 159 } 160 161 #ifdef CONFIG_IP_MULTICAST 162 163 /* 164 * Timer management 165 */ 166 167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 168 { 169 spin_lock_bh(&im->lock); 170 if (del_timer(&im->timer)) 171 atomic_dec(&im->refcnt); 172 im->tm_running=0; 173 im->reporter = 0; 174 im->unsolicit_count = 0; 175 spin_unlock_bh(&im->lock); 176 } 177 178 /* It must be called with locked im->lock */ 179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 180 { 181 int tv=net_random() % max_delay; 182 183 im->tm_running=1; 184 if (!mod_timer(&im->timer, jiffies+tv+2)) 185 atomic_inc(&im->refcnt); 186 } 187 188 static void igmp_gq_start_timer(struct in_device *in_dev) 189 { 190 int tv = net_random() % in_dev->mr_maxdelay; 191 192 in_dev->mr_gq_running = 1; 193 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 194 in_dev_hold(in_dev); 195 } 196 197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 198 { 199 int tv = net_random() % delay; 200 201 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 202 in_dev_hold(in_dev); 203 } 204 205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 206 { 207 spin_lock_bh(&im->lock); 208 im->unsolicit_count = 0; 209 if (del_timer(&im->timer)) { 210 if ((long)(im->timer.expires-jiffies) < max_delay) { 211 add_timer(&im->timer); 212 im->tm_running=1; 213 spin_unlock_bh(&im->lock); 214 return; 215 } 216 atomic_dec(&im->refcnt); 217 } 218 igmp_start_timer(im, max_delay); 219 spin_unlock_bh(&im->lock); 220 } 221 222 223 /* 224 * Send an IGMP report. 225 */ 226 227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 228 229 230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 231 int gdeleted, int sdeleted) 232 { 233 switch (type) { 234 case IGMPV3_MODE_IS_INCLUDE: 235 case IGMPV3_MODE_IS_EXCLUDE: 236 if (gdeleted || sdeleted) 237 return 0; 238 if (!(pmc->gsquery && !psf->sf_gsresp)) { 239 if (pmc->sfmode == MCAST_INCLUDE) 240 return 1; 241 /* don't include if this source is excluded 242 * in all filters 243 */ 244 if (psf->sf_count[MCAST_INCLUDE]) 245 return type == IGMPV3_MODE_IS_INCLUDE; 246 return pmc->sfcount[MCAST_EXCLUDE] == 247 psf->sf_count[MCAST_EXCLUDE]; 248 } 249 return 0; 250 case IGMPV3_CHANGE_TO_INCLUDE: 251 if (gdeleted || sdeleted) 252 return 0; 253 return psf->sf_count[MCAST_INCLUDE] != 0; 254 case IGMPV3_CHANGE_TO_EXCLUDE: 255 if (gdeleted || sdeleted) 256 return 0; 257 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 258 psf->sf_count[MCAST_INCLUDE]) 259 return 0; 260 return pmc->sfcount[MCAST_EXCLUDE] == 261 psf->sf_count[MCAST_EXCLUDE]; 262 case IGMPV3_ALLOW_NEW_SOURCES: 263 if (gdeleted || !psf->sf_crcount) 264 return 0; 265 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 266 case IGMPV3_BLOCK_OLD_SOURCES: 267 if (pmc->sfmode == MCAST_INCLUDE) 268 return gdeleted || (psf->sf_crcount && sdeleted); 269 return psf->sf_crcount && !gdeleted && !sdeleted; 270 } 271 return 0; 272 } 273 274 static int 275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 276 { 277 struct ip_sf_list *psf; 278 int scount = 0; 279 280 for (psf=pmc->sources; psf; psf=psf->sf_next) { 281 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 282 continue; 283 scount++; 284 } 285 return scount; 286 } 287 288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 289 { 290 struct sk_buff *skb; 291 struct rtable *rt; 292 struct iphdr *pip; 293 struct igmpv3_report *pig; 294 295 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); 296 if (skb == NULL) 297 return NULL; 298 299 { 300 struct flowi fl = { .oif = dev->ifindex, 301 .nl_u = { .ip4_u = { 302 .daddr = IGMPV3_ALL_MCR } }, 303 .proto = IPPROTO_IGMP }; 304 if (ip_route_output_key(&init_net, &rt, &fl)) { 305 kfree_skb(skb); 306 return NULL; 307 } 308 } 309 if (rt->rt_src == 0) { 310 kfree_skb(skb); 311 ip_rt_put(rt); 312 return NULL; 313 } 314 315 skb->dst = &rt->u.dst; 316 skb->dev = dev; 317 318 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 319 320 skb_reset_network_header(skb); 321 pip = ip_hdr(skb); 322 skb_put(skb, sizeof(struct iphdr) + 4); 323 324 pip->version = 4; 325 pip->ihl = (sizeof(struct iphdr)+4)>>2; 326 pip->tos = 0xc0; 327 pip->frag_off = htons(IP_DF); 328 pip->ttl = 1; 329 pip->daddr = rt->rt_dst; 330 pip->saddr = rt->rt_src; 331 pip->protocol = IPPROTO_IGMP; 332 pip->tot_len = 0; /* filled in later */ 333 ip_select_ident(pip, &rt->u.dst, NULL); 334 ((u8*)&pip[1])[0] = IPOPT_RA; 335 ((u8*)&pip[1])[1] = 4; 336 ((u8*)&pip[1])[2] = 0; 337 ((u8*)&pip[1])[3] = 0; 338 339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 340 skb_put(skb, sizeof(*pig)); 341 pig = igmpv3_report_hdr(skb); 342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 343 pig->resv1 = 0; 344 pig->csum = 0; 345 pig->resv2 = 0; 346 pig->ngrec = 0; 347 return skb; 348 } 349 350 static int igmpv3_sendpack(struct sk_buff *skb) 351 { 352 struct igmphdr *pig = igmp_hdr(skb); 353 const int igmplen = skb->tail - skb->transport_header; 354 355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 356 357 return ip_local_out(skb); 358 } 359 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 361 { 362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 363 } 364 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 366 int type, struct igmpv3_grec **ppgr) 367 { 368 struct net_device *dev = pmc->interface->dev; 369 struct igmpv3_report *pih; 370 struct igmpv3_grec *pgr; 371 372 if (!skb) 373 skb = igmpv3_newpack(dev, dev->mtu); 374 if (!skb) 375 return NULL; 376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 377 pgr->grec_type = type; 378 pgr->grec_auxwords = 0; 379 pgr->grec_nsrcs = 0; 380 pgr->grec_mca = pmc->multiaddr; 381 pih = igmpv3_report_hdr(skb); 382 pih->ngrec = htons(ntohs(pih->ngrec)+1); 383 *ppgr = pgr; 384 return skb; 385 } 386 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 388 skb_tailroom(skb)) : 0) 389 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 391 int type, int gdeleted, int sdeleted) 392 { 393 struct net_device *dev = pmc->interface->dev; 394 struct igmpv3_report *pih; 395 struct igmpv3_grec *pgr = NULL; 396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 397 int scount, stotal, first, isquery, truncate; 398 399 if (pmc->multiaddr == IGMP_ALL_HOSTS) 400 return skb; 401 402 isquery = type == IGMPV3_MODE_IS_INCLUDE || 403 type == IGMPV3_MODE_IS_EXCLUDE; 404 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 405 type == IGMPV3_CHANGE_TO_EXCLUDE; 406 407 stotal = scount = 0; 408 409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 410 411 if (!*psf_list) 412 goto empty_source; 413 414 pih = skb ? igmpv3_report_hdr(skb) : NULL; 415 416 /* EX and TO_EX get a fresh packet, if needed */ 417 if (truncate) { 418 if (pih && pih->ngrec && 419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 420 if (skb) 421 igmpv3_sendpack(skb); 422 skb = igmpv3_newpack(dev, dev->mtu); 423 } 424 } 425 first = 1; 426 psf_prev = NULL; 427 for (psf=*psf_list; psf; psf=psf_next) { 428 __be32 *psrc; 429 430 psf_next = psf->sf_next; 431 432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 433 psf_prev = psf; 434 continue; 435 } 436 437 /* clear marks on query responses */ 438 if (isquery) 439 psf->sf_gsresp = 0; 440 441 if (AVAILABLE(skb) < sizeof(__be32) + 442 first*sizeof(struct igmpv3_grec)) { 443 if (truncate && !first) 444 break; /* truncate these */ 445 if (pgr) 446 pgr->grec_nsrcs = htons(scount); 447 if (skb) 448 igmpv3_sendpack(skb); 449 skb = igmpv3_newpack(dev, dev->mtu); 450 first = 1; 451 scount = 0; 452 } 453 if (first) { 454 skb = add_grhead(skb, pmc, type, &pgr); 455 first = 0; 456 } 457 if (!skb) 458 return NULL; 459 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 460 *psrc = psf->sf_inaddr; 461 scount++; stotal++; 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 } 476 477 empty_source: 478 if (!stotal) { 479 if (type == IGMPV3_ALLOW_NEW_SOURCES || 480 type == IGMPV3_BLOCK_OLD_SOURCES) 481 return skb; 482 if (pmc->crcount || isquery) { 483 /* make sure we have room for group header */ 484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 485 igmpv3_sendpack(skb); 486 skb = NULL; /* add_grhead will get a new one */ 487 } 488 skb = add_grhead(skb, pmc, type, &pgr); 489 } 490 } 491 if (pgr) 492 pgr->grec_nsrcs = htons(scount); 493 494 if (isquery) 495 pmc->gsquery = 0; /* clear query state on report */ 496 return skb; 497 } 498 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 500 { 501 struct sk_buff *skb = NULL; 502 int type; 503 504 if (!pmc) { 505 read_lock(&in_dev->mc_list_lock); 506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 507 if (pmc->multiaddr == IGMP_ALL_HOSTS) 508 continue; 509 spin_lock_bh(&pmc->lock); 510 if (pmc->sfcount[MCAST_EXCLUDE]) 511 type = IGMPV3_MODE_IS_EXCLUDE; 512 else 513 type = IGMPV3_MODE_IS_INCLUDE; 514 skb = add_grec(skb, pmc, type, 0, 0); 515 spin_unlock_bh(&pmc->lock); 516 } 517 read_unlock(&in_dev->mc_list_lock); 518 } else { 519 spin_lock_bh(&pmc->lock); 520 if (pmc->sfcount[MCAST_EXCLUDE]) 521 type = IGMPV3_MODE_IS_EXCLUDE; 522 else 523 type = IGMPV3_MODE_IS_INCLUDE; 524 skb = add_grec(skb, pmc, type, 0, 0); 525 spin_unlock_bh(&pmc->lock); 526 } 527 if (!skb) 528 return 0; 529 return igmpv3_sendpack(skb); 530 } 531 532 /* 533 * remove zero-count source records from a source filter list 534 */ 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 536 { 537 struct ip_sf_list *psf_prev, *psf_next, *psf; 538 539 psf_prev = NULL; 540 for (psf=*ppsf; psf; psf = psf_next) { 541 psf_next = psf->sf_next; 542 if (psf->sf_crcount == 0) { 543 if (psf_prev) 544 psf_prev->sf_next = psf->sf_next; 545 else 546 *ppsf = psf->sf_next; 547 kfree(psf); 548 } else 549 psf_prev = psf; 550 } 551 } 552 553 static void igmpv3_send_cr(struct in_device *in_dev) 554 { 555 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 556 struct sk_buff *skb = NULL; 557 int type, dtype; 558 559 read_lock(&in_dev->mc_list_lock); 560 spin_lock_bh(&in_dev->mc_tomb_lock); 561 562 /* deleted MCA's */ 563 pmc_prev = NULL; 564 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 565 pmc_next = pmc->next; 566 if (pmc->sfmode == MCAST_INCLUDE) { 567 type = IGMPV3_BLOCK_OLD_SOURCES; 568 dtype = IGMPV3_BLOCK_OLD_SOURCES; 569 skb = add_grec(skb, pmc, type, 1, 0); 570 skb = add_grec(skb, pmc, dtype, 1, 1); 571 } 572 if (pmc->crcount) { 573 if (pmc->sfmode == MCAST_EXCLUDE) { 574 type = IGMPV3_CHANGE_TO_INCLUDE; 575 skb = add_grec(skb, pmc, type, 1, 0); 576 } 577 pmc->crcount--; 578 if (pmc->crcount == 0) { 579 igmpv3_clear_zeros(&pmc->tomb); 580 igmpv3_clear_zeros(&pmc->sources); 581 } 582 } 583 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 584 if (pmc_prev) 585 pmc_prev->next = pmc_next; 586 else 587 in_dev->mc_tomb = pmc_next; 588 in_dev_put(pmc->interface); 589 kfree(pmc); 590 } else 591 pmc_prev = pmc; 592 } 593 spin_unlock_bh(&in_dev->mc_tomb_lock); 594 595 /* change recs */ 596 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 597 spin_lock_bh(&pmc->lock); 598 if (pmc->sfcount[MCAST_EXCLUDE]) { 599 type = IGMPV3_BLOCK_OLD_SOURCES; 600 dtype = IGMPV3_ALLOW_NEW_SOURCES; 601 } else { 602 type = IGMPV3_ALLOW_NEW_SOURCES; 603 dtype = IGMPV3_BLOCK_OLD_SOURCES; 604 } 605 skb = add_grec(skb, pmc, type, 0, 0); 606 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 607 608 /* filter mode changes */ 609 if (pmc->crcount) { 610 if (pmc->sfmode == MCAST_EXCLUDE) 611 type = IGMPV3_CHANGE_TO_EXCLUDE; 612 else 613 type = IGMPV3_CHANGE_TO_INCLUDE; 614 skb = add_grec(skb, pmc, type, 0, 0); 615 pmc->crcount--; 616 } 617 spin_unlock_bh(&pmc->lock); 618 } 619 read_unlock(&in_dev->mc_list_lock); 620 621 if (!skb) 622 return; 623 (void) igmpv3_sendpack(skb); 624 } 625 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 627 int type) 628 { 629 struct sk_buff *skb; 630 struct iphdr *iph; 631 struct igmphdr *ih; 632 struct rtable *rt; 633 struct net_device *dev = in_dev->dev; 634 __be32 group = pmc ? pmc->multiaddr : 0; 635 __be32 dst; 636 637 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 638 return igmpv3_send_report(in_dev, pmc); 639 else if (type == IGMP_HOST_LEAVE_MESSAGE) 640 dst = IGMP_ALL_ROUTER; 641 else 642 dst = group; 643 644 { 645 struct flowi fl = { .oif = dev->ifindex, 646 .nl_u = { .ip4_u = { .daddr = dst } }, 647 .proto = IPPROTO_IGMP }; 648 if (ip_route_output_key(&init_net, &rt, &fl)) 649 return -1; 650 } 651 if (rt->rt_src == 0) { 652 ip_rt_put(rt); 653 return -1; 654 } 655 656 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 657 if (skb == NULL) { 658 ip_rt_put(rt); 659 return -1; 660 } 661 662 skb->dst = &rt->u.dst; 663 664 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 665 666 skb_reset_network_header(skb); 667 iph = ip_hdr(skb); 668 skb_put(skb, sizeof(struct iphdr) + 4); 669 670 iph->version = 4; 671 iph->ihl = (sizeof(struct iphdr)+4)>>2; 672 iph->tos = 0xc0; 673 iph->frag_off = htons(IP_DF); 674 iph->ttl = 1; 675 iph->daddr = dst; 676 iph->saddr = rt->rt_src; 677 iph->protocol = IPPROTO_IGMP; 678 ip_select_ident(iph, &rt->u.dst, NULL); 679 ((u8*)&iph[1])[0] = IPOPT_RA; 680 ((u8*)&iph[1])[1] = 4; 681 ((u8*)&iph[1])[2] = 0; 682 ((u8*)&iph[1])[3] = 0; 683 684 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 685 ih->type=type; 686 ih->code=0; 687 ih->csum=0; 688 ih->group=group; 689 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 690 691 return ip_local_out(skb); 692 } 693 694 static void igmp_gq_timer_expire(unsigned long data) 695 { 696 struct in_device *in_dev = (struct in_device *)data; 697 698 in_dev->mr_gq_running = 0; 699 igmpv3_send_report(in_dev, NULL); 700 __in_dev_put(in_dev); 701 } 702 703 static void igmp_ifc_timer_expire(unsigned long data) 704 { 705 struct in_device *in_dev = (struct in_device *)data; 706 707 igmpv3_send_cr(in_dev); 708 if (in_dev->mr_ifc_count) { 709 in_dev->mr_ifc_count--; 710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 711 } 712 __in_dev_put(in_dev); 713 } 714 715 static void igmp_ifc_event(struct in_device *in_dev) 716 { 717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 718 return; 719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 720 IGMP_Unsolicited_Report_Count; 721 igmp_ifc_start_timer(in_dev, 1); 722 } 723 724 725 static void igmp_timer_expire(unsigned long data) 726 { 727 struct ip_mc_list *im=(struct ip_mc_list *)data; 728 struct in_device *in_dev = im->interface; 729 730 spin_lock(&im->lock); 731 im->tm_running=0; 732 733 if (im->unsolicit_count) { 734 im->unsolicit_count--; 735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 736 } 737 im->reporter = 1; 738 spin_unlock(&im->lock); 739 740 if (IGMP_V1_SEEN(in_dev)) 741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 742 else if (IGMP_V2_SEEN(in_dev)) 743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 744 else 745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 746 747 ip_ma_put(im); 748 } 749 750 /* mark EXCLUDE-mode sources */ 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 752 { 753 struct ip_sf_list *psf; 754 int i, scount; 755 756 scount = 0; 757 for (psf=pmc->sources; psf; psf=psf->sf_next) { 758 if (scount == nsrcs) 759 break; 760 for (i=0; i<nsrcs; i++) { 761 /* skip inactive filters */ 762 if (pmc->sfcount[MCAST_INCLUDE] || 763 pmc->sfcount[MCAST_EXCLUDE] != 764 psf->sf_count[MCAST_EXCLUDE]) 765 continue; 766 if (srcs[i] == psf->sf_inaddr) { 767 scount++; 768 break; 769 } 770 } 771 } 772 pmc->gsquery = 0; 773 if (scount == nsrcs) /* all sources excluded */ 774 return 0; 775 return 1; 776 } 777 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 779 { 780 struct ip_sf_list *psf; 781 int i, scount; 782 783 if (pmc->sfmode == MCAST_EXCLUDE) 784 return igmp_xmarksources(pmc, nsrcs, srcs); 785 786 /* mark INCLUDE-mode sources */ 787 scount = 0; 788 for (psf=pmc->sources; psf; psf=psf->sf_next) { 789 if (scount == nsrcs) 790 break; 791 for (i=0; i<nsrcs; i++) 792 if (srcs[i] == psf->sf_inaddr) { 793 psf->sf_gsresp = 1; 794 scount++; 795 break; 796 } 797 } 798 if (!scount) { 799 pmc->gsquery = 0; 800 return 0; 801 } 802 pmc->gsquery = 1; 803 return 1; 804 } 805 806 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 807 { 808 struct ip_mc_list *im; 809 810 /* Timers are only set for non-local groups */ 811 812 if (group == IGMP_ALL_HOSTS) 813 return; 814 815 read_lock(&in_dev->mc_list_lock); 816 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 817 if (im->multiaddr == group) { 818 igmp_stop_timer(im); 819 break; 820 } 821 } 822 read_unlock(&in_dev->mc_list_lock); 823 } 824 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 826 int len) 827 { 828 struct igmphdr *ih = igmp_hdr(skb); 829 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 830 struct ip_mc_list *im; 831 __be32 group = ih->group; 832 int max_delay; 833 int mark = 0; 834 835 836 if (len == 8) { 837 if (ih->code == 0) { 838 /* Alas, old v1 router presents here. */ 839 840 max_delay = IGMP_Query_Response_Interval; 841 in_dev->mr_v1_seen = jiffies + 842 IGMP_V1_Router_Present_Timeout; 843 group = 0; 844 } else { 845 /* v2 router present */ 846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 847 in_dev->mr_v2_seen = jiffies + 848 IGMP_V2_Router_Present_Timeout; 849 } 850 /* cancel the interface change timer */ 851 in_dev->mr_ifc_count = 0; 852 if (del_timer(&in_dev->mr_ifc_timer)) 853 __in_dev_put(in_dev); 854 /* clear deleted report items */ 855 igmpv3_clear_delrec(in_dev); 856 } else if (len < 12) { 857 return; /* ignore bogus packet; freed by caller */ 858 } else { /* v3 */ 859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 860 return; 861 862 ih3 = igmpv3_query_hdr(skb); 863 if (ih3->nsrcs) { 864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 865 + ntohs(ih3->nsrcs)*sizeof(__be32))) 866 return; 867 ih3 = igmpv3_query_hdr(skb); 868 } 869 870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 871 if (!max_delay) 872 max_delay = 1; /* can't mod w/ 0 */ 873 in_dev->mr_maxdelay = max_delay; 874 if (ih3->qrv) 875 in_dev->mr_qrv = ih3->qrv; 876 if (!group) { /* general query */ 877 if (ih3->nsrcs) 878 return; /* no sources allowed */ 879 igmp_gq_start_timer(in_dev); 880 return; 881 } 882 /* mark sources to include, if group & source-specific */ 883 mark = ih3->nsrcs != 0; 884 } 885 886 /* 887 * - Start the timers in all of our membership records 888 * that the query applies to for the interface on 889 * which the query arrived excl. those that belong 890 * to a "local" group (224.0.0.X) 891 * - For timers already running check if they need to 892 * be reset. 893 * - Use the igmp->igmp_code field as the maximum 894 * delay possible 895 */ 896 read_lock(&in_dev->mc_list_lock); 897 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 898 int changed; 899 900 if (group && group != im->multiaddr) 901 continue; 902 if (im->multiaddr == IGMP_ALL_HOSTS) 903 continue; 904 spin_lock_bh(&im->lock); 905 if (im->tm_running) 906 im->gsquery = im->gsquery && mark; 907 else 908 im->gsquery = mark; 909 changed = !im->gsquery || 910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 911 spin_unlock_bh(&im->lock); 912 if (changed) 913 igmp_mod_timer(im, max_delay); 914 } 915 read_unlock(&in_dev->mc_list_lock); 916 } 917 918 int igmp_rcv(struct sk_buff *skb) 919 { 920 /* This basically follows the spec line by line -- see RFC1112 */ 921 struct igmphdr *ih; 922 struct in_device *in_dev = in_dev_get(skb->dev); 923 int len = skb->len; 924 925 if (in_dev==NULL) { 926 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_COMPLETE: 935 if (!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 = igmp_hdr(skb); 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, __be32 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, __be32 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, __be32 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, __be32 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 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1230 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1231 im->reporter = 0; 1232 im->gsquery = 0; 1233 #endif 1234 im->loaded = 0; 1235 write_lock_bh(&in_dev->mc_list_lock); 1236 im->next=in_dev->mc_list; 1237 in_dev->mc_list=im; 1238 write_unlock_bh(&in_dev->mc_list_lock); 1239 #ifdef CONFIG_IP_MULTICAST 1240 igmpv3_del_delrec(in_dev, im->multiaddr); 1241 #endif 1242 igmp_group_added(im); 1243 if (!in_dev->dead) 1244 ip_rt_multicast_event(in_dev); 1245 out: 1246 return; 1247 } 1248 1249 /* 1250 * Resend IGMP JOIN report; used for bonding. 1251 */ 1252 void ip_mc_rejoin_group(struct ip_mc_list *im) 1253 { 1254 #ifdef CONFIG_IP_MULTICAST 1255 struct in_device *in_dev = im->interface; 1256 1257 if (im->multiaddr == IGMP_ALL_HOSTS) 1258 return; 1259 1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1262 return; 1263 } 1264 /* else, v3 */ 1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1266 IGMP_Unsolicited_Report_Count; 1267 igmp_ifc_event(in_dev); 1268 #endif 1269 } 1270 1271 /* 1272 * A socket has left a multicast group on device dev 1273 */ 1274 1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1276 { 1277 struct ip_mc_list *i, **ip; 1278 1279 ASSERT_RTNL(); 1280 1281 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1282 if (i->multiaddr==addr) { 1283 if (--i->users == 0) { 1284 write_lock_bh(&in_dev->mc_list_lock); 1285 *ip = i->next; 1286 write_unlock_bh(&in_dev->mc_list_lock); 1287 igmp_group_dropped(i); 1288 1289 if (!in_dev->dead) 1290 ip_rt_multicast_event(in_dev); 1291 1292 ip_ma_put(i); 1293 return; 1294 } 1295 break; 1296 } 1297 } 1298 } 1299 1300 /* Device going down */ 1301 1302 void ip_mc_down(struct in_device *in_dev) 1303 { 1304 struct ip_mc_list *i; 1305 1306 ASSERT_RTNL(); 1307 1308 for (i=in_dev->mc_list; i; i=i->next) 1309 igmp_group_dropped(i); 1310 1311 #ifdef CONFIG_IP_MULTICAST 1312 in_dev->mr_ifc_count = 0; 1313 if (del_timer(&in_dev->mr_ifc_timer)) 1314 __in_dev_put(in_dev); 1315 in_dev->mr_gq_running = 0; 1316 if (del_timer(&in_dev->mr_gq_timer)) 1317 __in_dev_put(in_dev); 1318 igmpv3_clear_delrec(in_dev); 1319 #endif 1320 1321 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1322 } 1323 1324 void ip_mc_init_dev(struct in_device *in_dev) 1325 { 1326 ASSERT_RTNL(); 1327 1328 in_dev->mc_tomb = NULL; 1329 #ifdef CONFIG_IP_MULTICAST 1330 in_dev->mr_gq_running = 0; 1331 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1332 (unsigned long)in_dev); 1333 in_dev->mr_ifc_count = 0; 1334 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1335 (unsigned long)in_dev); 1336 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1337 #endif 1338 1339 rwlock_init(&in_dev->mc_list_lock); 1340 spin_lock_init(&in_dev->mc_tomb_lock); 1341 } 1342 1343 /* Device going up */ 1344 1345 void ip_mc_up(struct in_device *in_dev) 1346 { 1347 struct ip_mc_list *i; 1348 1349 ASSERT_RTNL(); 1350 1351 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1352 1353 for (i=in_dev->mc_list; i; i=i->next) 1354 igmp_group_added(i); 1355 } 1356 1357 /* 1358 * Device is about to be destroyed: clean up. 1359 */ 1360 1361 void ip_mc_destroy_dev(struct in_device *in_dev) 1362 { 1363 struct ip_mc_list *i; 1364 1365 ASSERT_RTNL(); 1366 1367 /* Deactivate timers */ 1368 ip_mc_down(in_dev); 1369 1370 write_lock_bh(&in_dev->mc_list_lock); 1371 while ((i = in_dev->mc_list) != NULL) { 1372 in_dev->mc_list = i->next; 1373 write_unlock_bh(&in_dev->mc_list_lock); 1374 1375 igmp_group_dropped(i); 1376 ip_ma_put(i); 1377 1378 write_lock_bh(&in_dev->mc_list_lock); 1379 } 1380 write_unlock_bh(&in_dev->mc_list_lock); 1381 } 1382 1383 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1384 { 1385 struct flowi fl = { .nl_u = { .ip4_u = 1386 { .daddr = imr->imr_multiaddr.s_addr } } }; 1387 struct rtable *rt; 1388 struct net_device *dev = NULL; 1389 struct in_device *idev = NULL; 1390 1391 if (imr->imr_ifindex) { 1392 idev = inetdev_by_index(&init_net, imr->imr_ifindex); 1393 if (idev) 1394 __in_dev_put(idev); 1395 return idev; 1396 } 1397 if (imr->imr_address.s_addr) { 1398 dev = ip_dev_find(&init_net, imr->imr_address.s_addr); 1399 if (!dev) 1400 return NULL; 1401 dev_put(dev); 1402 } 1403 1404 if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) { 1405 dev = rt->u.dst.dev; 1406 ip_rt_put(rt); 1407 } 1408 if (dev) { 1409 imr->imr_ifindex = dev->ifindex; 1410 idev = __in_dev_get_rtnl(dev); 1411 } 1412 return idev; 1413 } 1414 1415 /* 1416 * Join a socket to a group 1417 */ 1418 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1419 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1420 1421 1422 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1423 __be32 *psfsrc) 1424 { 1425 struct ip_sf_list *psf, *psf_prev; 1426 int rv = 0; 1427 1428 psf_prev = NULL; 1429 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1430 if (psf->sf_inaddr == *psfsrc) 1431 break; 1432 psf_prev = psf; 1433 } 1434 if (!psf || psf->sf_count[sfmode] == 0) { 1435 /* source filter not found, or count wrong => bug */ 1436 return -ESRCH; 1437 } 1438 psf->sf_count[sfmode]--; 1439 if (psf->sf_count[sfmode] == 0) { 1440 ip_rt_multicast_event(pmc->interface); 1441 } 1442 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1443 #ifdef CONFIG_IP_MULTICAST 1444 struct in_device *in_dev = pmc->interface; 1445 #endif 1446 1447 /* no more filters for this source */ 1448 if (psf_prev) 1449 psf_prev->sf_next = psf->sf_next; 1450 else 1451 pmc->sources = psf->sf_next; 1452 #ifdef CONFIG_IP_MULTICAST 1453 if (psf->sf_oldin && 1454 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1455 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1456 IGMP_Unsolicited_Report_Count; 1457 psf->sf_next = pmc->tomb; 1458 pmc->tomb = psf; 1459 rv = 1; 1460 } else 1461 #endif 1462 kfree(psf); 1463 } 1464 return rv; 1465 } 1466 1467 #ifndef CONFIG_IP_MULTICAST 1468 #define igmp_ifc_event(x) do { } while (0) 1469 #endif 1470 1471 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1472 int sfcount, __be32 *psfsrc, int delta) 1473 { 1474 struct ip_mc_list *pmc; 1475 int changerec = 0; 1476 int i, err; 1477 1478 if (!in_dev) 1479 return -ENODEV; 1480 read_lock(&in_dev->mc_list_lock); 1481 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1482 if (*pmca == pmc->multiaddr) 1483 break; 1484 } 1485 if (!pmc) { 1486 /* MCA not found?? bug */ 1487 read_unlock(&in_dev->mc_list_lock); 1488 return -ESRCH; 1489 } 1490 spin_lock_bh(&pmc->lock); 1491 read_unlock(&in_dev->mc_list_lock); 1492 #ifdef CONFIG_IP_MULTICAST 1493 sf_markstate(pmc); 1494 #endif 1495 if (!delta) { 1496 err = -EINVAL; 1497 if (!pmc->sfcount[sfmode]) 1498 goto out_unlock; 1499 pmc->sfcount[sfmode]--; 1500 } 1501 err = 0; 1502 for (i=0; i<sfcount; i++) { 1503 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1504 1505 changerec |= rv > 0; 1506 if (!err && rv < 0) 1507 err = rv; 1508 } 1509 if (pmc->sfmode == MCAST_EXCLUDE && 1510 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1511 pmc->sfcount[MCAST_INCLUDE]) { 1512 #ifdef CONFIG_IP_MULTICAST 1513 struct ip_sf_list *psf; 1514 #endif 1515 1516 /* filter mode change */ 1517 pmc->sfmode = MCAST_INCLUDE; 1518 #ifdef CONFIG_IP_MULTICAST 1519 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1520 IGMP_Unsolicited_Report_Count; 1521 in_dev->mr_ifc_count = pmc->crcount; 1522 for (psf=pmc->sources; psf; psf = psf->sf_next) 1523 psf->sf_crcount = 0; 1524 igmp_ifc_event(pmc->interface); 1525 } else if (sf_setstate(pmc) || changerec) { 1526 igmp_ifc_event(pmc->interface); 1527 #endif 1528 } 1529 out_unlock: 1530 spin_unlock_bh(&pmc->lock); 1531 return err; 1532 } 1533 1534 /* 1535 * Add multicast single-source filter to the interface list 1536 */ 1537 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1538 __be32 *psfsrc, int delta) 1539 { 1540 struct ip_sf_list *psf, *psf_prev; 1541 1542 psf_prev = NULL; 1543 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1544 if (psf->sf_inaddr == *psfsrc) 1545 break; 1546 psf_prev = psf; 1547 } 1548 if (!psf) { 1549 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1550 if (!psf) 1551 return -ENOBUFS; 1552 psf->sf_inaddr = *psfsrc; 1553 if (psf_prev) { 1554 psf_prev->sf_next = psf; 1555 } else 1556 pmc->sources = psf; 1557 } 1558 psf->sf_count[sfmode]++; 1559 if (psf->sf_count[sfmode] == 1) { 1560 ip_rt_multicast_event(pmc->interface); 1561 } 1562 return 0; 1563 } 1564 1565 #ifdef CONFIG_IP_MULTICAST 1566 static void sf_markstate(struct ip_mc_list *pmc) 1567 { 1568 struct ip_sf_list *psf; 1569 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1570 1571 for (psf=pmc->sources; psf; psf=psf->sf_next) 1572 if (pmc->sfcount[MCAST_EXCLUDE]) { 1573 psf->sf_oldin = mca_xcount == 1574 psf->sf_count[MCAST_EXCLUDE] && 1575 !psf->sf_count[MCAST_INCLUDE]; 1576 } else 1577 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1578 } 1579 1580 static int sf_setstate(struct ip_mc_list *pmc) 1581 { 1582 struct ip_sf_list *psf, *dpsf; 1583 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1584 int qrv = pmc->interface->mr_qrv; 1585 int new_in, rv; 1586 1587 rv = 0; 1588 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1589 if (pmc->sfcount[MCAST_EXCLUDE]) { 1590 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1591 !psf->sf_count[MCAST_INCLUDE]; 1592 } else 1593 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1594 if (new_in) { 1595 if (!psf->sf_oldin) { 1596 struct ip_sf_list *prev = NULL; 1597 1598 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1599 if (dpsf->sf_inaddr == psf->sf_inaddr) 1600 break; 1601 prev = dpsf; 1602 } 1603 if (dpsf) { 1604 if (prev) 1605 prev->sf_next = dpsf->sf_next; 1606 else 1607 pmc->tomb = dpsf->sf_next; 1608 kfree(dpsf); 1609 } 1610 psf->sf_crcount = qrv; 1611 rv++; 1612 } 1613 } else if (psf->sf_oldin) { 1614 1615 psf->sf_crcount = 0; 1616 /* 1617 * add or update "delete" records if an active filter 1618 * is now inactive 1619 */ 1620 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1621 if (dpsf->sf_inaddr == psf->sf_inaddr) 1622 break; 1623 if (!dpsf) { 1624 dpsf = (struct ip_sf_list *) 1625 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1626 if (!dpsf) 1627 continue; 1628 *dpsf = *psf; 1629 /* pmc->lock held by callers */ 1630 dpsf->sf_next = pmc->tomb; 1631 pmc->tomb = dpsf; 1632 } 1633 dpsf->sf_crcount = qrv; 1634 rv++; 1635 } 1636 } 1637 return rv; 1638 } 1639 #endif 1640 1641 /* 1642 * Add multicast source filter list to the interface list 1643 */ 1644 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1645 int sfcount, __be32 *psfsrc, int delta) 1646 { 1647 struct ip_mc_list *pmc; 1648 int isexclude; 1649 int i, err; 1650 1651 if (!in_dev) 1652 return -ENODEV; 1653 read_lock(&in_dev->mc_list_lock); 1654 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1655 if (*pmca == pmc->multiaddr) 1656 break; 1657 } 1658 if (!pmc) { 1659 /* MCA not found?? bug */ 1660 read_unlock(&in_dev->mc_list_lock); 1661 return -ESRCH; 1662 } 1663 spin_lock_bh(&pmc->lock); 1664 read_unlock(&in_dev->mc_list_lock); 1665 1666 #ifdef CONFIG_IP_MULTICAST 1667 sf_markstate(pmc); 1668 #endif 1669 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1670 if (!delta) 1671 pmc->sfcount[sfmode]++; 1672 err = 0; 1673 for (i=0; i<sfcount; i++) { 1674 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1675 if (err) 1676 break; 1677 } 1678 if (err) { 1679 int j; 1680 1681 pmc->sfcount[sfmode]--; 1682 for (j=0; j<i; j++) 1683 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1684 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1685 #ifdef CONFIG_IP_MULTICAST 1686 struct ip_sf_list *psf; 1687 in_dev = pmc->interface; 1688 #endif 1689 1690 /* filter mode change */ 1691 if (pmc->sfcount[MCAST_EXCLUDE]) 1692 pmc->sfmode = MCAST_EXCLUDE; 1693 else if (pmc->sfcount[MCAST_INCLUDE]) 1694 pmc->sfmode = MCAST_INCLUDE; 1695 #ifdef CONFIG_IP_MULTICAST 1696 /* else no filters; keep old mode for reports */ 1697 1698 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1699 IGMP_Unsolicited_Report_Count; 1700 in_dev->mr_ifc_count = pmc->crcount; 1701 for (psf=pmc->sources; psf; psf = psf->sf_next) 1702 psf->sf_crcount = 0; 1703 igmp_ifc_event(in_dev); 1704 } else if (sf_setstate(pmc)) { 1705 igmp_ifc_event(in_dev); 1706 #endif 1707 } 1708 spin_unlock_bh(&pmc->lock); 1709 return err; 1710 } 1711 1712 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1713 { 1714 struct ip_sf_list *psf, *nextpsf; 1715 1716 for (psf=pmc->tomb; psf; psf=nextpsf) { 1717 nextpsf = psf->sf_next; 1718 kfree(psf); 1719 } 1720 pmc->tomb = NULL; 1721 for (psf=pmc->sources; psf; psf=nextpsf) { 1722 nextpsf = psf->sf_next; 1723 kfree(psf); 1724 } 1725 pmc->sources = NULL; 1726 pmc->sfmode = MCAST_EXCLUDE; 1727 pmc->sfcount[MCAST_INCLUDE] = 0; 1728 pmc->sfcount[MCAST_EXCLUDE] = 1; 1729 } 1730 1731 1732 /* 1733 * Join a multicast group 1734 */ 1735 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1736 { 1737 int err; 1738 __be32 addr = imr->imr_multiaddr.s_addr; 1739 struct ip_mc_socklist *iml=NULL, *i; 1740 struct in_device *in_dev; 1741 struct inet_sock *inet = inet_sk(sk); 1742 int ifindex; 1743 int count = 0; 1744 1745 if (!ipv4_is_multicast(addr)) 1746 return -EINVAL; 1747 1748 rtnl_lock(); 1749 1750 in_dev = ip_mc_find_dev(imr); 1751 1752 if (!in_dev) { 1753 iml = NULL; 1754 err = -ENODEV; 1755 goto done; 1756 } 1757 1758 err = -EADDRINUSE; 1759 ifindex = imr->imr_ifindex; 1760 for (i = inet->mc_list; i; i = i->next) { 1761 if (i->multi.imr_multiaddr.s_addr == addr && 1762 i->multi.imr_ifindex == ifindex) 1763 goto done; 1764 count++; 1765 } 1766 err = -ENOBUFS; 1767 if (count >= sysctl_igmp_max_memberships) 1768 goto done; 1769 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1770 if (iml == NULL) 1771 goto done; 1772 1773 memcpy(&iml->multi, imr, sizeof(*imr)); 1774 iml->next = inet->mc_list; 1775 iml->sflist = NULL; 1776 iml->sfmode = MCAST_EXCLUDE; 1777 inet->mc_list = iml; 1778 ip_mc_inc_group(in_dev, addr); 1779 err = 0; 1780 done: 1781 rtnl_unlock(); 1782 return err; 1783 } 1784 1785 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1786 struct in_device *in_dev) 1787 { 1788 int err; 1789 1790 if (iml->sflist == NULL) { 1791 /* any-source empty exclude case */ 1792 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1793 iml->sfmode, 0, NULL, 0); 1794 } 1795 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1796 iml->sfmode, iml->sflist->sl_count, 1797 iml->sflist->sl_addr, 0); 1798 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1799 iml->sflist = NULL; 1800 return err; 1801 } 1802 1803 /* 1804 * Ask a socket to leave a group. 1805 */ 1806 1807 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1808 { 1809 struct inet_sock *inet = inet_sk(sk); 1810 struct ip_mc_socklist *iml, **imlp; 1811 struct in_device *in_dev; 1812 __be32 group = imr->imr_multiaddr.s_addr; 1813 u32 ifindex; 1814 int ret = -EADDRNOTAVAIL; 1815 1816 rtnl_lock(); 1817 in_dev = ip_mc_find_dev(imr); 1818 ifindex = imr->imr_ifindex; 1819 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1820 if (iml->multi.imr_multiaddr.s_addr != group) 1821 continue; 1822 if (ifindex) { 1823 if (iml->multi.imr_ifindex != ifindex) 1824 continue; 1825 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1826 iml->multi.imr_address.s_addr) 1827 continue; 1828 1829 (void) ip_mc_leave_src(sk, iml, in_dev); 1830 1831 *imlp = iml->next; 1832 1833 if (in_dev) 1834 ip_mc_dec_group(in_dev, group); 1835 rtnl_unlock(); 1836 sock_kfree_s(sk, iml, sizeof(*iml)); 1837 return 0; 1838 } 1839 if (!in_dev) 1840 ret = -ENODEV; 1841 rtnl_unlock(); 1842 return ret; 1843 } 1844 1845 int ip_mc_source(int add, int omode, struct sock *sk, struct 1846 ip_mreq_source *mreqs, int ifindex) 1847 { 1848 int err; 1849 struct ip_mreqn imr; 1850 __be32 addr = mreqs->imr_multiaddr; 1851 struct ip_mc_socklist *pmc; 1852 struct in_device *in_dev = NULL; 1853 struct inet_sock *inet = inet_sk(sk); 1854 struct ip_sf_socklist *psl; 1855 int leavegroup = 0; 1856 int i, j, rv; 1857 1858 if (!ipv4_is_multicast(addr)) 1859 return -EINVAL; 1860 1861 rtnl_lock(); 1862 1863 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1864 imr.imr_address.s_addr = mreqs->imr_interface; 1865 imr.imr_ifindex = ifindex; 1866 in_dev = ip_mc_find_dev(&imr); 1867 1868 if (!in_dev) { 1869 err = -ENODEV; 1870 goto done; 1871 } 1872 err = -EADDRNOTAVAIL; 1873 1874 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1875 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1876 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1877 break; 1878 } 1879 if (!pmc) { /* must have a prior join */ 1880 err = -EINVAL; 1881 goto done; 1882 } 1883 /* if a source filter was set, must be the same mode as before */ 1884 if (pmc->sflist) { 1885 if (pmc->sfmode != omode) { 1886 err = -EINVAL; 1887 goto done; 1888 } 1889 } else if (pmc->sfmode != omode) { 1890 /* allow mode switches for empty-set filters */ 1891 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1892 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1893 NULL, 0); 1894 pmc->sfmode = omode; 1895 } 1896 1897 psl = pmc->sflist; 1898 if (!add) { 1899 if (!psl) 1900 goto done; /* err = -EADDRNOTAVAIL */ 1901 rv = !0; 1902 for (i=0; i<psl->sl_count; i++) { 1903 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1904 sizeof(__be32)); 1905 if (rv == 0) 1906 break; 1907 } 1908 if (rv) /* source not found */ 1909 goto done; /* err = -EADDRNOTAVAIL */ 1910 1911 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1912 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1913 leavegroup = 1; 1914 goto done; 1915 } 1916 1917 /* update the interface filter */ 1918 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1919 &mreqs->imr_sourceaddr, 1); 1920 1921 for (j=i+1; j<psl->sl_count; j++) 1922 psl->sl_addr[j-1] = psl->sl_addr[j]; 1923 psl->sl_count--; 1924 err = 0; 1925 goto done; 1926 } 1927 /* else, add a new source to the filter */ 1928 1929 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1930 err = -ENOBUFS; 1931 goto done; 1932 } 1933 if (!psl || psl->sl_count == psl->sl_max) { 1934 struct ip_sf_socklist *newpsl; 1935 int count = IP_SFBLOCK; 1936 1937 if (psl) 1938 count += psl->sl_max; 1939 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1940 if (!newpsl) { 1941 err = -ENOBUFS; 1942 goto done; 1943 } 1944 newpsl->sl_max = count; 1945 newpsl->sl_count = count - IP_SFBLOCK; 1946 if (psl) { 1947 for (i=0; i<psl->sl_count; i++) 1948 newpsl->sl_addr[i] = psl->sl_addr[i]; 1949 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1950 } 1951 pmc->sflist = psl = newpsl; 1952 } 1953 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1954 for (i=0; i<psl->sl_count; i++) { 1955 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1956 sizeof(__be32)); 1957 if (rv == 0) 1958 break; 1959 } 1960 if (rv == 0) /* address already there is an error */ 1961 goto done; 1962 for (j=psl->sl_count-1; j>=i; j--) 1963 psl->sl_addr[j+1] = psl->sl_addr[j]; 1964 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1965 psl->sl_count++; 1966 err = 0; 1967 /* update the interface list */ 1968 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1969 &mreqs->imr_sourceaddr, 1); 1970 done: 1971 rtnl_unlock(); 1972 if (leavegroup) 1973 return ip_mc_leave_group(sk, &imr); 1974 return err; 1975 } 1976 1977 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1978 { 1979 int err = 0; 1980 struct ip_mreqn imr; 1981 __be32 addr = msf->imsf_multiaddr; 1982 struct ip_mc_socklist *pmc; 1983 struct in_device *in_dev; 1984 struct inet_sock *inet = inet_sk(sk); 1985 struct ip_sf_socklist *newpsl, *psl; 1986 int leavegroup = 0; 1987 1988 if (!ipv4_is_multicast(addr)) 1989 return -EINVAL; 1990 if (msf->imsf_fmode != MCAST_INCLUDE && 1991 msf->imsf_fmode != MCAST_EXCLUDE) 1992 return -EINVAL; 1993 1994 rtnl_lock(); 1995 1996 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 1997 imr.imr_address.s_addr = msf->imsf_interface; 1998 imr.imr_ifindex = ifindex; 1999 in_dev = ip_mc_find_dev(&imr); 2000 2001 if (!in_dev) { 2002 err = -ENODEV; 2003 goto done; 2004 } 2005 2006 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2007 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2008 leavegroup = 1; 2009 goto done; 2010 } 2011 2012 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2013 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2014 pmc->multi.imr_ifindex == imr.imr_ifindex) 2015 break; 2016 } 2017 if (!pmc) { /* must have a prior join */ 2018 err = -EINVAL; 2019 goto done; 2020 } 2021 if (msf->imsf_numsrc) { 2022 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2023 GFP_KERNEL); 2024 if (!newpsl) { 2025 err = -ENOBUFS; 2026 goto done; 2027 } 2028 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2029 memcpy(newpsl->sl_addr, msf->imsf_slist, 2030 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2031 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2032 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2033 if (err) { 2034 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2035 goto done; 2036 } 2037 } else { 2038 newpsl = NULL; 2039 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2040 msf->imsf_fmode, 0, NULL, 0); 2041 } 2042 psl = pmc->sflist; 2043 if (psl) { 2044 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2045 psl->sl_count, psl->sl_addr, 0); 2046 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2047 } else 2048 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2049 0, NULL, 0); 2050 pmc->sflist = newpsl; 2051 pmc->sfmode = msf->imsf_fmode; 2052 err = 0; 2053 done: 2054 rtnl_unlock(); 2055 if (leavegroup) 2056 err = ip_mc_leave_group(sk, &imr); 2057 return err; 2058 } 2059 2060 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2061 struct ip_msfilter __user *optval, int __user *optlen) 2062 { 2063 int err, len, count, copycount; 2064 struct ip_mreqn imr; 2065 __be32 addr = msf->imsf_multiaddr; 2066 struct ip_mc_socklist *pmc; 2067 struct in_device *in_dev; 2068 struct inet_sock *inet = inet_sk(sk); 2069 struct ip_sf_socklist *psl; 2070 2071 if (!ipv4_is_multicast(addr)) 2072 return -EINVAL; 2073 2074 rtnl_lock(); 2075 2076 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2077 imr.imr_address.s_addr = msf->imsf_interface; 2078 imr.imr_ifindex = 0; 2079 in_dev = ip_mc_find_dev(&imr); 2080 2081 if (!in_dev) { 2082 err = -ENODEV; 2083 goto done; 2084 } 2085 err = -EADDRNOTAVAIL; 2086 2087 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2088 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2089 pmc->multi.imr_ifindex == imr.imr_ifindex) 2090 break; 2091 } 2092 if (!pmc) /* must have a prior join */ 2093 goto done; 2094 msf->imsf_fmode = pmc->sfmode; 2095 psl = pmc->sflist; 2096 rtnl_unlock(); 2097 if (!psl) { 2098 len = 0; 2099 count = 0; 2100 } else { 2101 count = psl->sl_count; 2102 } 2103 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2104 len = copycount * sizeof(psl->sl_addr[0]); 2105 msf->imsf_numsrc = count; 2106 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2107 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2108 return -EFAULT; 2109 } 2110 if (len && 2111 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2112 return -EFAULT; 2113 return 0; 2114 done: 2115 rtnl_unlock(); 2116 return err; 2117 } 2118 2119 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2120 struct group_filter __user *optval, int __user *optlen) 2121 { 2122 int err, i, count, copycount; 2123 struct sockaddr_in *psin; 2124 __be32 addr; 2125 struct ip_mc_socklist *pmc; 2126 struct inet_sock *inet = inet_sk(sk); 2127 struct ip_sf_socklist *psl; 2128 2129 psin = (struct sockaddr_in *)&gsf->gf_group; 2130 if (psin->sin_family != AF_INET) 2131 return -EINVAL; 2132 addr = psin->sin_addr.s_addr; 2133 if (!ipv4_is_multicast(addr)) 2134 return -EINVAL; 2135 2136 rtnl_lock(); 2137 2138 err = -EADDRNOTAVAIL; 2139 2140 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2141 if (pmc->multi.imr_multiaddr.s_addr == addr && 2142 pmc->multi.imr_ifindex == gsf->gf_interface) 2143 break; 2144 } 2145 if (!pmc) /* must have a prior join */ 2146 goto done; 2147 gsf->gf_fmode = pmc->sfmode; 2148 psl = pmc->sflist; 2149 rtnl_unlock(); 2150 count = psl ? psl->sl_count : 0; 2151 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2152 gsf->gf_numsrc = count; 2153 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2154 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2155 return -EFAULT; 2156 } 2157 for (i=0; i<copycount; i++) { 2158 struct sockaddr_storage ss; 2159 2160 psin = (struct sockaddr_in *)&ss; 2161 memset(&ss, 0, sizeof(ss)); 2162 psin->sin_family = AF_INET; 2163 psin->sin_addr.s_addr = psl->sl_addr[i]; 2164 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2165 return -EFAULT; 2166 } 2167 return 0; 2168 done: 2169 rtnl_unlock(); 2170 return err; 2171 } 2172 2173 /* 2174 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2175 */ 2176 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2177 { 2178 struct inet_sock *inet = inet_sk(sk); 2179 struct ip_mc_socklist *pmc; 2180 struct ip_sf_socklist *psl; 2181 int i; 2182 2183 if (!ipv4_is_multicast(loc_addr)) 2184 return 1; 2185 2186 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2187 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2188 pmc->multi.imr_ifindex == dif) 2189 break; 2190 } 2191 if (!pmc) 2192 return 1; 2193 psl = pmc->sflist; 2194 if (!psl) 2195 return pmc->sfmode == MCAST_EXCLUDE; 2196 2197 for (i=0; i<psl->sl_count; i++) { 2198 if (psl->sl_addr[i] == rmt_addr) 2199 break; 2200 } 2201 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2202 return 0; 2203 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2204 return 0; 2205 return 1; 2206 } 2207 2208 /* 2209 * A socket is closing. 2210 */ 2211 2212 void ip_mc_drop_socket(struct sock *sk) 2213 { 2214 struct inet_sock *inet = inet_sk(sk); 2215 struct ip_mc_socklist *iml; 2216 2217 if (inet->mc_list == NULL) 2218 return; 2219 2220 rtnl_lock(); 2221 while ((iml = inet->mc_list) != NULL) { 2222 struct in_device *in_dev; 2223 inet->mc_list = iml->next; 2224 2225 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex); 2226 (void) ip_mc_leave_src(sk, iml, in_dev); 2227 if (in_dev != NULL) { 2228 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2229 in_dev_put(in_dev); 2230 } 2231 sock_kfree_s(sk, iml, sizeof(*iml)); 2232 } 2233 rtnl_unlock(); 2234 } 2235 2236 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2237 { 2238 struct ip_mc_list *im; 2239 struct ip_sf_list *psf; 2240 int rv = 0; 2241 2242 read_lock(&in_dev->mc_list_lock); 2243 for (im=in_dev->mc_list; im; im=im->next) { 2244 if (im->multiaddr == mc_addr) 2245 break; 2246 } 2247 if (im && proto == IPPROTO_IGMP) { 2248 rv = 1; 2249 } else if (im) { 2250 if (src_addr) { 2251 for (psf=im->sources; psf; psf=psf->sf_next) { 2252 if (psf->sf_inaddr == src_addr) 2253 break; 2254 } 2255 if (psf) 2256 rv = psf->sf_count[MCAST_INCLUDE] || 2257 psf->sf_count[MCAST_EXCLUDE] != 2258 im->sfcount[MCAST_EXCLUDE]; 2259 else 2260 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2261 } else 2262 rv = 1; /* unspecified source; tentatively allow */ 2263 } 2264 read_unlock(&in_dev->mc_list_lock); 2265 return rv; 2266 } 2267 2268 #if defined(CONFIG_PROC_FS) 2269 struct igmp_mc_iter_state { 2270 struct net_device *dev; 2271 struct in_device *in_dev; 2272 }; 2273 2274 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2275 2276 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2277 { 2278 struct ip_mc_list *im = NULL; 2279 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2280 2281 state->in_dev = NULL; 2282 for_each_netdev(&init_net, state->dev) { 2283 struct in_device *in_dev; 2284 in_dev = in_dev_get(state->dev); 2285 if (!in_dev) 2286 continue; 2287 read_lock(&in_dev->mc_list_lock); 2288 im = in_dev->mc_list; 2289 if (im) { 2290 state->in_dev = in_dev; 2291 break; 2292 } 2293 read_unlock(&in_dev->mc_list_lock); 2294 in_dev_put(in_dev); 2295 } 2296 return im; 2297 } 2298 2299 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2300 { 2301 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2302 im = im->next; 2303 while (!im) { 2304 if (likely(state->in_dev != NULL)) { 2305 read_unlock(&state->in_dev->mc_list_lock); 2306 in_dev_put(state->in_dev); 2307 } 2308 state->dev = next_net_device(state->dev); 2309 if (!state->dev) { 2310 state->in_dev = NULL; 2311 break; 2312 } 2313 state->in_dev = in_dev_get(state->dev); 2314 if (!state->in_dev) 2315 continue; 2316 read_lock(&state->in_dev->mc_list_lock); 2317 im = state->in_dev->mc_list; 2318 } 2319 return im; 2320 } 2321 2322 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2323 { 2324 struct ip_mc_list *im = igmp_mc_get_first(seq); 2325 if (im) 2326 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2327 --pos; 2328 return pos ? NULL : im; 2329 } 2330 2331 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2332 __acquires(dev_base_lock) 2333 { 2334 read_lock(&dev_base_lock); 2335 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2336 } 2337 2338 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2339 { 2340 struct ip_mc_list *im; 2341 if (v == SEQ_START_TOKEN) 2342 im = igmp_mc_get_first(seq); 2343 else 2344 im = igmp_mc_get_next(seq, v); 2345 ++*pos; 2346 return im; 2347 } 2348 2349 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2350 __releases(dev_base_lock) 2351 { 2352 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2353 if (likely(state->in_dev != NULL)) { 2354 read_unlock(&state->in_dev->mc_list_lock); 2355 in_dev_put(state->in_dev); 2356 state->in_dev = NULL; 2357 } 2358 state->dev = NULL; 2359 read_unlock(&dev_base_lock); 2360 } 2361 2362 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2363 { 2364 if (v == SEQ_START_TOKEN) 2365 seq_puts(seq, 2366 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2367 else { 2368 struct ip_mc_list *im = (struct ip_mc_list *)v; 2369 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2370 char *querier; 2371 #ifdef CONFIG_IP_MULTICAST 2372 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2373 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2374 "V3"; 2375 #else 2376 querier = "NONE"; 2377 #endif 2378 2379 if (state->in_dev->mc_list == im) { 2380 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2381 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2382 } 2383 2384 seq_printf(seq, 2385 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2386 im->multiaddr, im->users, 2387 im->tm_running, im->tm_running ? 2388 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2389 im->reporter); 2390 } 2391 return 0; 2392 } 2393 2394 static const struct seq_operations igmp_mc_seq_ops = { 2395 .start = igmp_mc_seq_start, 2396 .next = igmp_mc_seq_next, 2397 .stop = igmp_mc_seq_stop, 2398 .show = igmp_mc_seq_show, 2399 }; 2400 2401 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2402 { 2403 return seq_open_private(file, &igmp_mc_seq_ops, 2404 sizeof(struct igmp_mc_iter_state)); 2405 } 2406 2407 static const struct file_operations igmp_mc_seq_fops = { 2408 .owner = THIS_MODULE, 2409 .open = igmp_mc_seq_open, 2410 .read = seq_read, 2411 .llseek = seq_lseek, 2412 .release = seq_release_private, 2413 }; 2414 2415 struct igmp_mcf_iter_state { 2416 struct net_device *dev; 2417 struct in_device *idev; 2418 struct ip_mc_list *im; 2419 }; 2420 2421 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2422 2423 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2424 { 2425 struct ip_sf_list *psf = NULL; 2426 struct ip_mc_list *im = NULL; 2427 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2428 2429 state->idev = NULL; 2430 state->im = NULL; 2431 for_each_netdev(&init_net, state->dev) { 2432 struct in_device *idev; 2433 idev = in_dev_get(state->dev); 2434 if (unlikely(idev == NULL)) 2435 continue; 2436 read_lock(&idev->mc_list_lock); 2437 im = idev->mc_list; 2438 if (likely(im != NULL)) { 2439 spin_lock_bh(&im->lock); 2440 psf = im->sources; 2441 if (likely(psf != NULL)) { 2442 state->im = im; 2443 state->idev = idev; 2444 break; 2445 } 2446 spin_unlock_bh(&im->lock); 2447 } 2448 read_unlock(&idev->mc_list_lock); 2449 in_dev_put(idev); 2450 } 2451 return psf; 2452 } 2453 2454 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2455 { 2456 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2457 2458 psf = psf->sf_next; 2459 while (!psf) { 2460 spin_unlock_bh(&state->im->lock); 2461 state->im = state->im->next; 2462 while (!state->im) { 2463 if (likely(state->idev != NULL)) { 2464 read_unlock(&state->idev->mc_list_lock); 2465 in_dev_put(state->idev); 2466 } 2467 state->dev = next_net_device(state->dev); 2468 if (!state->dev) { 2469 state->idev = NULL; 2470 goto out; 2471 } 2472 state->idev = in_dev_get(state->dev); 2473 if (!state->idev) 2474 continue; 2475 read_lock(&state->idev->mc_list_lock); 2476 state->im = state->idev->mc_list; 2477 } 2478 if (!state->im) 2479 break; 2480 spin_lock_bh(&state->im->lock); 2481 psf = state->im->sources; 2482 } 2483 out: 2484 return psf; 2485 } 2486 2487 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2488 { 2489 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2490 if (psf) 2491 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2492 --pos; 2493 return pos ? NULL : psf; 2494 } 2495 2496 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2497 { 2498 read_lock(&dev_base_lock); 2499 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2500 } 2501 2502 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2503 { 2504 struct ip_sf_list *psf; 2505 if (v == SEQ_START_TOKEN) 2506 psf = igmp_mcf_get_first(seq); 2507 else 2508 psf = igmp_mcf_get_next(seq, v); 2509 ++*pos; 2510 return psf; 2511 } 2512 2513 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2514 { 2515 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2516 if (likely(state->im != NULL)) { 2517 spin_unlock_bh(&state->im->lock); 2518 state->im = NULL; 2519 } 2520 if (likely(state->idev != NULL)) { 2521 read_unlock(&state->idev->mc_list_lock); 2522 in_dev_put(state->idev); 2523 state->idev = NULL; 2524 } 2525 state->dev = NULL; 2526 read_unlock(&dev_base_lock); 2527 } 2528 2529 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2530 { 2531 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2532 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2533 2534 if (v == SEQ_START_TOKEN) { 2535 seq_printf(seq, 2536 "%3s %6s " 2537 "%10s %10s %6s %6s\n", "Idx", 2538 "Device", "MCA", 2539 "SRC", "INC", "EXC"); 2540 } else { 2541 seq_printf(seq, 2542 "%3d %6.6s 0x%08x " 2543 "0x%08x %6lu %6lu\n", 2544 state->dev->ifindex, state->dev->name, 2545 ntohl(state->im->multiaddr), 2546 ntohl(psf->sf_inaddr), 2547 psf->sf_count[MCAST_INCLUDE], 2548 psf->sf_count[MCAST_EXCLUDE]); 2549 } 2550 return 0; 2551 } 2552 2553 static const struct seq_operations igmp_mcf_seq_ops = { 2554 .start = igmp_mcf_seq_start, 2555 .next = igmp_mcf_seq_next, 2556 .stop = igmp_mcf_seq_stop, 2557 .show = igmp_mcf_seq_show, 2558 }; 2559 2560 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2561 { 2562 return seq_open_private(file, &igmp_mcf_seq_ops, 2563 sizeof(struct igmp_mcf_iter_state)); 2564 } 2565 2566 static const struct file_operations igmp_mcf_seq_fops = { 2567 .owner = THIS_MODULE, 2568 .open = igmp_mcf_seq_open, 2569 .read = seq_read, 2570 .llseek = seq_lseek, 2571 .release = seq_release_private, 2572 }; 2573 2574 int __init igmp_mc_proc_init(void) 2575 { 2576 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2577 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2578 return 0; 2579 } 2580 #endif 2581 2582 EXPORT_SYMBOL(ip_mc_dec_group); 2583 EXPORT_SYMBOL(ip_mc_inc_group); 2584 EXPORT_SYMBOL(ip_mc_join_group); 2585 EXPORT_SYMBOL(ip_mc_rejoin_group); 2586