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 * Authors: 12 * Alan Cox <Alan.Cox@linux.org> 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 * Fixes: 20 * 21 * Alan Cox : Added lots of __inline__ to optimise 22 * the memory usage of all the tiny little 23 * functions. 24 * Alan Cox : Dumped the header building experiment. 25 * Alan Cox : Minor tweaks ready for multicast routing 26 * and extended IGMP protocol. 27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 28 * writes utterly bogus code otherwise (sigh) 29 * fixed IGMP loopback to behave in the manner 30 * desired by mrouted, fixed the fact it has been 31 * broken since 1.3.6 and cleaned up a few minor 32 * points. 33 * 34 * Chih-Jen Chang : Tried to revise IGMP to Version 2 35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 36 * The enhancements are mainly based on Steve Deering's 37 * ipmulti-3.5 source code. 38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 40 * the mrouted version on that device. 41 * Chih-Jen Chang : Added the max_resp_time parameter to 42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 43 * to identify the multicast router version 44 * and do what the IGMP version 2 specified. 45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 46 * Tsu-Sheng Tsao if the specified time expired. 47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 48 * Alan Cox : Use GFP_ATOMIC in the right places. 49 * Christian Daudt : igmp timer wasn't set for local group 50 * memberships but was being deleted, 51 * which caused a "del_timer() called 52 * from %p with timer not initialized\n" 53 * message (960131). 54 * Christian Daudt : removed del_timer from 55 * igmp_timer_expire function (960205). 56 * Christian Daudt : igmp_heard_report now only calls 57 * igmp_timer_expire if tm->running is 58 * true (960216). 59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 60 * igmp_heard_query never trigger. Expiry 61 * miscalculation fixed in igmp_heard_query 62 * and random() made to return unsigned to 63 * prevent negative expiry times. 64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 65 * fix from pending 2.1.x patches. 66 * Alan Cox: Forget to enable FDDI support earlier. 67 * Alexey Kuznetsov: Fixed leaving groups on device down. 68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 69 * David L Stevens: IGMPv3 support, with help from 70 * Vinay Kulkarni 71 */ 72 73 #include <linux/module.h> 74 #include <asm/uaccess.h> 75 #include <asm/system.h> 76 #include <linux/types.h> 77 #include <linux/kernel.h> 78 #include <linux/jiffies.h> 79 #include <linux/string.h> 80 #include <linux/socket.h> 81 #include <linux/sockios.h> 82 #include <linux/in.h> 83 #include <linux/inet.h> 84 #include <linux/netdevice.h> 85 #include <linux/skbuff.h> 86 #include <linux/inetdevice.h> 87 #include <linux/igmp.h> 88 #include <linux/if_arp.h> 89 #include <linux/rtnetlink.h> 90 #include <linux/times.h> 91 92 #include <net/net_namespace.h> 93 #include <net/arp.h> 94 #include <net/ip.h> 95 #include <net/protocol.h> 96 #include <net/route.h> 97 #include <net/sock.h> 98 #include <net/checksum.h> 99 #include <linux/netfilter_ipv4.h> 100 #ifdef CONFIG_IP_MROUTE 101 #include <linux/mroute.h> 102 #endif 103 #ifdef CONFIG_PROC_FS 104 #include <linux/proc_fs.h> 105 #include <linux/seq_file.h> 106 #endif 107 108 #define IP_MAX_MEMBERSHIPS 20 109 #define IP_MAX_MSF 10 110 111 #ifdef CONFIG_IP_MULTICAST 112 /* Parameter names and values are taken from igmp-v2-06 draft */ 113 114 #define IGMP_V1_Router_Present_Timeout (400*HZ) 115 #define IGMP_V2_Router_Present_Timeout (400*HZ) 116 #define IGMP_Unsolicited_Report_Interval (10*HZ) 117 #define IGMP_Query_Response_Interval (10*HZ) 118 #define IGMP_Unsolicited_Report_Count 2 119 120 121 #define IGMP_Initial_Report_Delay (1) 122 123 /* IGMP_Initial_Report_Delay is not from IGMP specs! 124 * IGMP specs require to report membership immediately after 125 * joining a group, but we delay the first report by a 126 * small interval. It seems more natural and still does not 127 * contradict to specs provided this delay is small enough. 128 */ 129 130 #define IGMP_V1_SEEN(in_dev) \ 131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 132 IN_DEV_CONF_GET((in_dev), 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) \ 136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 138 ((in_dev)->mr_v2_seen && \ 139 time_before(jiffies, (in_dev)->mr_v2_seen))) 140 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 143 static void igmpv3_clear_delrec(struct in_device *in_dev); 144 static int sf_setstate(struct ip_mc_list *pmc); 145 static void sf_markstate(struct ip_mc_list *pmc); 146 #endif 147 static void ip_mc_clear_src(struct ip_mc_list *pmc); 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 149 int sfcount, __be32 *psfsrc, int delta); 150 151 static void ip_ma_put(struct ip_mc_list *im) 152 { 153 if (atomic_dec_and_test(&im->refcnt)) { 154 in_dev_put(im->interface); 155 kfree(im); 156 } 157 } 158 159 #ifdef CONFIG_IP_MULTICAST 160 161 /* 162 * Timer management 163 */ 164 165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 166 { 167 spin_lock_bh(&im->lock); 168 if (del_timer(&im->timer)) 169 atomic_dec(&im->refcnt); 170 im->tm_running=0; 171 im->reporter = 0; 172 im->unsolicit_count = 0; 173 spin_unlock_bh(&im->lock); 174 } 175 176 /* It must be called with locked im->lock */ 177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 178 { 179 int tv=net_random() % max_delay; 180 181 im->tm_running=1; 182 if (!mod_timer(&im->timer, jiffies+tv+2)) 183 atomic_inc(&im->refcnt); 184 } 185 186 static void igmp_gq_start_timer(struct in_device *in_dev) 187 { 188 int tv = net_random() % in_dev->mr_maxdelay; 189 190 in_dev->mr_gq_running = 1; 191 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 192 in_dev_hold(in_dev); 193 } 194 195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 196 { 197 int tv = net_random() % delay; 198 199 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 200 in_dev_hold(in_dev); 201 } 202 203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 204 { 205 spin_lock_bh(&im->lock); 206 im->unsolicit_count = 0; 207 if (del_timer(&im->timer)) { 208 if ((long)(im->timer.expires-jiffies) < max_delay) { 209 add_timer(&im->timer); 210 im->tm_running=1; 211 spin_unlock_bh(&im->lock); 212 return; 213 } 214 atomic_dec(&im->refcnt); 215 } 216 igmp_start_timer(im, max_delay); 217 spin_unlock_bh(&im->lock); 218 } 219 220 221 /* 222 * Send an IGMP report. 223 */ 224 225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 226 227 228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 229 int gdeleted, int sdeleted) 230 { 231 switch (type) { 232 case IGMPV3_MODE_IS_INCLUDE: 233 case IGMPV3_MODE_IS_EXCLUDE: 234 if (gdeleted || sdeleted) 235 return 0; 236 if (!(pmc->gsquery && !psf->sf_gsresp)) { 237 if (pmc->sfmode == MCAST_INCLUDE) 238 return 1; 239 /* don't include if this source is excluded 240 * in all filters 241 */ 242 if (psf->sf_count[MCAST_INCLUDE]) 243 return type == IGMPV3_MODE_IS_INCLUDE; 244 return pmc->sfcount[MCAST_EXCLUDE] == 245 psf->sf_count[MCAST_EXCLUDE]; 246 } 247 return 0; 248 case IGMPV3_CHANGE_TO_INCLUDE: 249 if (gdeleted || sdeleted) 250 return 0; 251 return psf->sf_count[MCAST_INCLUDE] != 0; 252 case IGMPV3_CHANGE_TO_EXCLUDE: 253 if (gdeleted || sdeleted) 254 return 0; 255 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 256 psf->sf_count[MCAST_INCLUDE]) 257 return 0; 258 return pmc->sfcount[MCAST_EXCLUDE] == 259 psf->sf_count[MCAST_EXCLUDE]; 260 case IGMPV3_ALLOW_NEW_SOURCES: 261 if (gdeleted || !psf->sf_crcount) 262 return 0; 263 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 264 case IGMPV3_BLOCK_OLD_SOURCES: 265 if (pmc->sfmode == MCAST_INCLUDE) 266 return gdeleted || (psf->sf_crcount && sdeleted); 267 return psf->sf_crcount && !gdeleted && !sdeleted; 268 } 269 return 0; 270 } 271 272 static int 273 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 274 { 275 struct ip_sf_list *psf; 276 int scount = 0; 277 278 for (psf=pmc->sources; psf; psf=psf->sf_next) { 279 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 280 continue; 281 scount++; 282 } 283 return scount; 284 } 285 286 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 287 { 288 struct sk_buff *skb; 289 struct rtable *rt; 290 struct iphdr *pip; 291 struct igmpv3_report *pig; 292 struct net *net = dev_net(dev); 293 294 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 295 if (skb == NULL) 296 return NULL; 297 298 { 299 struct flowi fl = { .oif = dev->ifindex, 300 .nl_u = { .ip4_u = { 301 .daddr = IGMPV3_ALL_MCR } }, 302 .proto = IPPROTO_IGMP }; 303 if (ip_route_output_key(net, &rt, &fl)) { 304 kfree_skb(skb); 305 return NULL; 306 } 307 } 308 if (rt->rt_src == 0) { 309 kfree_skb(skb); 310 ip_rt_put(rt); 311 return NULL; 312 } 313 314 skb->dst = &rt->u.dst; 315 skb->dev = dev; 316 317 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 318 319 skb_reset_network_header(skb); 320 pip = ip_hdr(skb); 321 skb_put(skb, sizeof(struct iphdr) + 4); 322 323 pip->version = 4; 324 pip->ihl = (sizeof(struct iphdr)+4)>>2; 325 pip->tos = 0xc0; 326 pip->frag_off = htons(IP_DF); 327 pip->ttl = 1; 328 pip->daddr = rt->rt_dst; 329 pip->saddr = rt->rt_src; 330 pip->protocol = IPPROTO_IGMP; 331 pip->tot_len = 0; /* filled in later */ 332 ip_select_ident(pip, &rt->u.dst, NULL); 333 ((u8*)&pip[1])[0] = IPOPT_RA; 334 ((u8*)&pip[1])[1] = 4; 335 ((u8*)&pip[1])[2] = 0; 336 ((u8*)&pip[1])[3] = 0; 337 338 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 339 skb_put(skb, sizeof(*pig)); 340 pig = igmpv3_report_hdr(skb); 341 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 342 pig->resv1 = 0; 343 pig->csum = 0; 344 pig->resv2 = 0; 345 pig->ngrec = 0; 346 return skb; 347 } 348 349 static int igmpv3_sendpack(struct sk_buff *skb) 350 { 351 struct igmphdr *pig = igmp_hdr(skb); 352 const int igmplen = skb->tail - skb->transport_header; 353 354 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 355 356 return ip_local_out(skb); 357 } 358 359 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 360 { 361 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 362 } 363 364 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 365 int type, struct igmpv3_grec **ppgr) 366 { 367 struct net_device *dev = pmc->interface->dev; 368 struct igmpv3_report *pih; 369 struct igmpv3_grec *pgr; 370 371 if (!skb) 372 skb = igmpv3_newpack(dev, dev->mtu); 373 if (!skb) 374 return NULL; 375 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 376 pgr->grec_type = type; 377 pgr->grec_auxwords = 0; 378 pgr->grec_nsrcs = 0; 379 pgr->grec_mca = pmc->multiaddr; 380 pih = igmpv3_report_hdr(skb); 381 pih->ngrec = htons(ntohs(pih->ngrec)+1); 382 *ppgr = pgr; 383 return skb; 384 } 385 386 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 387 skb_tailroom(skb)) : 0) 388 389 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 390 int type, int gdeleted, int sdeleted) 391 { 392 struct net_device *dev = pmc->interface->dev; 393 struct igmpv3_report *pih; 394 struct igmpv3_grec *pgr = NULL; 395 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 396 int scount, stotal, first, isquery, truncate; 397 398 if (pmc->multiaddr == IGMP_ALL_HOSTS) 399 return skb; 400 401 isquery = type == IGMPV3_MODE_IS_INCLUDE || 402 type == IGMPV3_MODE_IS_EXCLUDE; 403 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 404 type == IGMPV3_CHANGE_TO_EXCLUDE; 405 406 stotal = scount = 0; 407 408 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 409 410 if (!*psf_list) 411 goto empty_source; 412 413 pih = skb ? igmpv3_report_hdr(skb) : NULL; 414 415 /* EX and TO_EX get a fresh packet, if needed */ 416 if (truncate) { 417 if (pih && pih->ngrec && 418 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 419 if (skb) 420 igmpv3_sendpack(skb); 421 skb = igmpv3_newpack(dev, dev->mtu); 422 } 423 } 424 first = 1; 425 psf_prev = NULL; 426 for (psf=*psf_list; psf; psf=psf_next) { 427 __be32 *psrc; 428 429 psf_next = psf->sf_next; 430 431 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 432 psf_prev = psf; 433 continue; 434 } 435 436 /* clear marks on query responses */ 437 if (isquery) 438 psf->sf_gsresp = 0; 439 440 if (AVAILABLE(skb) < sizeof(__be32) + 441 first*sizeof(struct igmpv3_grec)) { 442 if (truncate && !first) 443 break; /* truncate these */ 444 if (pgr) 445 pgr->grec_nsrcs = htons(scount); 446 if (skb) 447 igmpv3_sendpack(skb); 448 skb = igmpv3_newpack(dev, dev->mtu); 449 first = 1; 450 scount = 0; 451 } 452 if (first) { 453 skb = add_grhead(skb, pmc, type, &pgr); 454 first = 0; 455 } 456 if (!skb) 457 return NULL; 458 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 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 struct net *net = dev_net(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(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_ALLOCATED_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 goto drop; 927 928 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 929 goto drop_ref; 930 931 switch (skb->ip_summed) { 932 case CHECKSUM_COMPLETE: 933 if (!csum_fold(skb->csum)) 934 break; 935 /* fall through */ 936 case CHECKSUM_NONE: 937 skb->csum = 0; 938 if (__skb_checksum_complete(skb)) 939 goto drop_ref; 940 } 941 942 ih = igmp_hdr(skb); 943 switch (ih->type) { 944 case IGMP_HOST_MEMBERSHIP_QUERY: 945 igmp_heard_query(in_dev, skb, len); 946 break; 947 case IGMP_HOST_MEMBERSHIP_REPORT: 948 case IGMPV2_HOST_MEMBERSHIP_REPORT: 949 case IGMPV3_HOST_MEMBERSHIP_REPORT: 950 /* Is it our report looped back? */ 951 if (skb->rtable->fl.iif == 0) 952 break; 953 /* don't rely on MC router hearing unicast reports */ 954 if (skb->pkt_type == PACKET_MULTICAST || 955 skb->pkt_type == PACKET_BROADCAST) 956 igmp_heard_report(in_dev, ih->group); 957 break; 958 case IGMP_PIM: 959 #ifdef CONFIG_IP_PIMSM_V1 960 in_dev_put(in_dev); 961 return pim_rcv_v1(skb); 962 #endif 963 case IGMP_DVMRP: 964 case IGMP_TRACE: 965 case IGMP_HOST_LEAVE_MESSAGE: 966 case IGMP_MTRACE: 967 case IGMP_MTRACE_RESP: 968 break; 969 default: 970 break; 971 } 972 973 drop_ref: 974 in_dev_put(in_dev); 975 drop: 976 kfree_skb(skb); 977 return 0; 978 } 979 980 #endif 981 982 983 /* 984 * Add a filter to a device 985 */ 986 987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 988 { 989 char buf[MAX_ADDR_LEN]; 990 struct net_device *dev = in_dev->dev; 991 992 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 993 We will get multicast token leakage, when IFF_MULTICAST 994 is changed. This check should be done in dev->set_multicast_list 995 routine. Something sort of: 996 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 997 --ANK 998 */ 999 if (arp_mc_map(addr, buf, dev, 0) == 0) 1000 dev_mc_add(dev,buf,dev->addr_len,0); 1001 } 1002 1003 /* 1004 * Remove a filter from a device 1005 */ 1006 1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1008 { 1009 char buf[MAX_ADDR_LEN]; 1010 struct net_device *dev = in_dev->dev; 1011 1012 if (arp_mc_map(addr, buf, dev, 0) == 0) 1013 dev_mc_delete(dev,buf,dev->addr_len,0); 1014 } 1015 1016 #ifdef CONFIG_IP_MULTICAST 1017 /* 1018 * deleted ip_mc_list manipulation 1019 */ 1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1021 { 1022 struct ip_mc_list *pmc; 1023 1024 /* this is an "ip_mc_list" for convenience; only the fields below 1025 * are actually used. In particular, the refcnt and users are not 1026 * used for management of the delete list. Using the same structure 1027 * for deleted items allows change reports to use common code with 1028 * non-deleted or query-response MCA's. 1029 */ 1030 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1031 if (!pmc) 1032 return; 1033 spin_lock_bh(&im->lock); 1034 pmc->interface = im->interface; 1035 in_dev_hold(in_dev); 1036 pmc->multiaddr = im->multiaddr; 1037 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1038 IGMP_Unsolicited_Report_Count; 1039 pmc->sfmode = im->sfmode; 1040 if (pmc->sfmode == MCAST_INCLUDE) { 1041 struct ip_sf_list *psf; 1042 1043 pmc->tomb = im->tomb; 1044 pmc->sources = im->sources; 1045 im->tomb = im->sources = NULL; 1046 for (psf=pmc->sources; psf; psf=psf->sf_next) 1047 psf->sf_crcount = pmc->crcount; 1048 } 1049 spin_unlock_bh(&im->lock); 1050 1051 spin_lock_bh(&in_dev->mc_tomb_lock); 1052 pmc->next = in_dev->mc_tomb; 1053 in_dev->mc_tomb = pmc; 1054 spin_unlock_bh(&in_dev->mc_tomb_lock); 1055 } 1056 1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1058 { 1059 struct ip_mc_list *pmc, *pmc_prev; 1060 struct ip_sf_list *psf, *psf_next; 1061 1062 spin_lock_bh(&in_dev->mc_tomb_lock); 1063 pmc_prev = NULL; 1064 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1065 if (pmc->multiaddr == multiaddr) 1066 break; 1067 pmc_prev = pmc; 1068 } 1069 if (pmc) { 1070 if (pmc_prev) 1071 pmc_prev->next = pmc->next; 1072 else 1073 in_dev->mc_tomb = pmc->next; 1074 } 1075 spin_unlock_bh(&in_dev->mc_tomb_lock); 1076 if (pmc) { 1077 for (psf=pmc->tomb; psf; psf=psf_next) { 1078 psf_next = psf->sf_next; 1079 kfree(psf); 1080 } 1081 in_dev_put(pmc->interface); 1082 kfree(pmc); 1083 } 1084 } 1085 1086 static void igmpv3_clear_delrec(struct in_device *in_dev) 1087 { 1088 struct ip_mc_list *pmc, *nextpmc; 1089 1090 spin_lock_bh(&in_dev->mc_tomb_lock); 1091 pmc = in_dev->mc_tomb; 1092 in_dev->mc_tomb = NULL; 1093 spin_unlock_bh(&in_dev->mc_tomb_lock); 1094 1095 for (; pmc; pmc = nextpmc) { 1096 nextpmc = pmc->next; 1097 ip_mc_clear_src(pmc); 1098 in_dev_put(pmc->interface); 1099 kfree(pmc); 1100 } 1101 /* clear dead sources, too */ 1102 read_lock(&in_dev->mc_list_lock); 1103 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1104 struct ip_sf_list *psf, *psf_next; 1105 1106 spin_lock_bh(&pmc->lock); 1107 psf = pmc->tomb; 1108 pmc->tomb = NULL; 1109 spin_unlock_bh(&pmc->lock); 1110 for (; psf; psf=psf_next) { 1111 psf_next = psf->sf_next; 1112 kfree(psf); 1113 } 1114 } 1115 read_unlock(&in_dev->mc_list_lock); 1116 } 1117 #endif 1118 1119 static void igmp_group_dropped(struct ip_mc_list *im) 1120 { 1121 struct in_device *in_dev = im->interface; 1122 #ifdef CONFIG_IP_MULTICAST 1123 int reporter; 1124 #endif 1125 1126 if (im->loaded) { 1127 im->loaded = 0; 1128 ip_mc_filter_del(in_dev, im->multiaddr); 1129 } 1130 1131 #ifdef CONFIG_IP_MULTICAST 1132 if (im->multiaddr == IGMP_ALL_HOSTS) 1133 return; 1134 1135 reporter = im->reporter; 1136 igmp_stop_timer(im); 1137 1138 if (!in_dev->dead) { 1139 if (IGMP_V1_SEEN(in_dev)) 1140 goto done; 1141 if (IGMP_V2_SEEN(in_dev)) { 1142 if (reporter) 1143 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1144 goto done; 1145 } 1146 /* IGMPv3 */ 1147 igmpv3_add_delrec(in_dev, im); 1148 1149 igmp_ifc_event(in_dev); 1150 } 1151 done: 1152 #endif 1153 ip_mc_clear_src(im); 1154 } 1155 1156 static void igmp_group_added(struct ip_mc_list *im) 1157 { 1158 struct in_device *in_dev = im->interface; 1159 1160 if (im->loaded == 0) { 1161 im->loaded = 1; 1162 ip_mc_filter_add(in_dev, im->multiaddr); 1163 } 1164 1165 #ifdef CONFIG_IP_MULTICAST 1166 if (im->multiaddr == IGMP_ALL_HOSTS) 1167 return; 1168 1169 if (in_dev->dead) 1170 return; 1171 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1172 spin_lock_bh(&im->lock); 1173 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1174 spin_unlock_bh(&im->lock); 1175 return; 1176 } 1177 /* else, v3 */ 1178 1179 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1180 IGMP_Unsolicited_Report_Count; 1181 igmp_ifc_event(in_dev); 1182 #endif 1183 } 1184 1185 1186 /* 1187 * Multicast list managers 1188 */ 1189 1190 1191 /* 1192 * A socket has joined a multicast group on device dev. 1193 */ 1194 1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1196 { 1197 struct ip_mc_list *im; 1198 1199 ASSERT_RTNL(); 1200 1201 for (im=in_dev->mc_list; im; im=im->next) { 1202 if (im->multiaddr == addr) { 1203 im->users++; 1204 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1205 goto out; 1206 } 1207 } 1208 1209 im = kmalloc(sizeof(*im), GFP_KERNEL); 1210 if (!im) 1211 goto out; 1212 1213 im->users=1; 1214 im->interface=in_dev; 1215 in_dev_hold(in_dev); 1216 im->multiaddr=addr; 1217 /* initial mode is (EX, empty) */ 1218 im->sfmode = MCAST_EXCLUDE; 1219 im->sfcount[MCAST_INCLUDE] = 0; 1220 im->sfcount[MCAST_EXCLUDE] = 1; 1221 im->sources = NULL; 1222 im->tomb = NULL; 1223 im->crcount = 0; 1224 atomic_set(&im->refcnt, 1); 1225 spin_lock_init(&im->lock); 1226 #ifdef CONFIG_IP_MULTICAST 1227 im->tm_running=0; 1228 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1229 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1230 im->reporter = 0; 1231 im->gsquery = 0; 1232 #endif 1233 im->loaded = 0; 1234 write_lock_bh(&in_dev->mc_list_lock); 1235 im->next=in_dev->mc_list; 1236 in_dev->mc_list=im; 1237 write_unlock_bh(&in_dev->mc_list_lock); 1238 #ifdef CONFIG_IP_MULTICAST 1239 igmpv3_del_delrec(in_dev, im->multiaddr); 1240 #endif 1241 igmp_group_added(im); 1242 if (!in_dev->dead) 1243 ip_rt_multicast_event(in_dev); 1244 out: 1245 return; 1246 } 1247 1248 /* 1249 * Resend IGMP JOIN report; used for bonding. 1250 */ 1251 void ip_mc_rejoin_group(struct ip_mc_list *im) 1252 { 1253 #ifdef CONFIG_IP_MULTICAST 1254 struct in_device *in_dev = im->interface; 1255 1256 if (im->multiaddr == IGMP_ALL_HOSTS) 1257 return; 1258 1259 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1260 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1261 return; 1262 } 1263 /* else, v3 */ 1264 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1265 IGMP_Unsolicited_Report_Count; 1266 igmp_ifc_event(in_dev); 1267 #endif 1268 } 1269 1270 /* 1271 * A socket has left a multicast group on device dev 1272 */ 1273 1274 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1275 { 1276 struct ip_mc_list *i, **ip; 1277 1278 ASSERT_RTNL(); 1279 1280 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1281 if (i->multiaddr==addr) { 1282 if (--i->users == 0) { 1283 write_lock_bh(&in_dev->mc_list_lock); 1284 *ip = i->next; 1285 write_unlock_bh(&in_dev->mc_list_lock); 1286 igmp_group_dropped(i); 1287 1288 if (!in_dev->dead) 1289 ip_rt_multicast_event(in_dev); 1290 1291 ip_ma_put(i); 1292 return; 1293 } 1294 break; 1295 } 1296 } 1297 } 1298 1299 /* Device going down */ 1300 1301 void ip_mc_down(struct in_device *in_dev) 1302 { 1303 struct ip_mc_list *i; 1304 1305 ASSERT_RTNL(); 1306 1307 for (i=in_dev->mc_list; i; i=i->next) 1308 igmp_group_dropped(i); 1309 1310 #ifdef CONFIG_IP_MULTICAST 1311 in_dev->mr_ifc_count = 0; 1312 if (del_timer(&in_dev->mr_ifc_timer)) 1313 __in_dev_put(in_dev); 1314 in_dev->mr_gq_running = 0; 1315 if (del_timer(&in_dev->mr_gq_timer)) 1316 __in_dev_put(in_dev); 1317 igmpv3_clear_delrec(in_dev); 1318 #endif 1319 1320 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1321 } 1322 1323 void ip_mc_init_dev(struct in_device *in_dev) 1324 { 1325 ASSERT_RTNL(); 1326 1327 in_dev->mc_tomb = NULL; 1328 #ifdef CONFIG_IP_MULTICAST 1329 in_dev->mr_gq_running = 0; 1330 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1331 (unsigned long)in_dev); 1332 in_dev->mr_ifc_count = 0; 1333 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1334 (unsigned long)in_dev); 1335 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1336 #endif 1337 1338 rwlock_init(&in_dev->mc_list_lock); 1339 spin_lock_init(&in_dev->mc_tomb_lock); 1340 } 1341 1342 /* Device going up */ 1343 1344 void ip_mc_up(struct in_device *in_dev) 1345 { 1346 struct ip_mc_list *i; 1347 1348 ASSERT_RTNL(); 1349 1350 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1351 1352 for (i=in_dev->mc_list; i; i=i->next) 1353 igmp_group_added(i); 1354 } 1355 1356 /* 1357 * Device is about to be destroyed: clean up. 1358 */ 1359 1360 void ip_mc_destroy_dev(struct in_device *in_dev) 1361 { 1362 struct ip_mc_list *i; 1363 1364 ASSERT_RTNL(); 1365 1366 /* Deactivate timers */ 1367 ip_mc_down(in_dev); 1368 1369 write_lock_bh(&in_dev->mc_list_lock); 1370 while ((i = in_dev->mc_list) != NULL) { 1371 in_dev->mc_list = i->next; 1372 write_unlock_bh(&in_dev->mc_list_lock); 1373 1374 igmp_group_dropped(i); 1375 ip_ma_put(i); 1376 1377 write_lock_bh(&in_dev->mc_list_lock); 1378 } 1379 write_unlock_bh(&in_dev->mc_list_lock); 1380 } 1381 1382 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1383 { 1384 struct flowi fl = { .nl_u = { .ip4_u = 1385 { .daddr = imr->imr_multiaddr.s_addr } } }; 1386 struct rtable *rt; 1387 struct net_device *dev = NULL; 1388 struct in_device *idev = NULL; 1389 1390 if (imr->imr_ifindex) { 1391 idev = inetdev_by_index(net, imr->imr_ifindex); 1392 if (idev) 1393 __in_dev_put(idev); 1394 return idev; 1395 } 1396 if (imr->imr_address.s_addr) { 1397 dev = ip_dev_find(net, imr->imr_address.s_addr); 1398 if (!dev) 1399 return NULL; 1400 dev_put(dev); 1401 } 1402 1403 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1404 dev = rt->u.dst.dev; 1405 ip_rt_put(rt); 1406 } 1407 if (dev) { 1408 imr->imr_ifindex = dev->ifindex; 1409 idev = __in_dev_get_rtnl(dev); 1410 } 1411 return idev; 1412 } 1413 1414 /* 1415 * Join a socket to a group 1416 */ 1417 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1418 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1419 1420 1421 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1422 __be32 *psfsrc) 1423 { 1424 struct ip_sf_list *psf, *psf_prev; 1425 int rv = 0; 1426 1427 psf_prev = NULL; 1428 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1429 if (psf->sf_inaddr == *psfsrc) 1430 break; 1431 psf_prev = psf; 1432 } 1433 if (!psf || psf->sf_count[sfmode] == 0) { 1434 /* source filter not found, or count wrong => bug */ 1435 return -ESRCH; 1436 } 1437 psf->sf_count[sfmode]--; 1438 if (psf->sf_count[sfmode] == 0) { 1439 ip_rt_multicast_event(pmc->interface); 1440 } 1441 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1442 #ifdef CONFIG_IP_MULTICAST 1443 struct in_device *in_dev = pmc->interface; 1444 #endif 1445 1446 /* no more filters for this source */ 1447 if (psf_prev) 1448 psf_prev->sf_next = psf->sf_next; 1449 else 1450 pmc->sources = psf->sf_next; 1451 #ifdef CONFIG_IP_MULTICAST 1452 if (psf->sf_oldin && 1453 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1454 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1455 IGMP_Unsolicited_Report_Count; 1456 psf->sf_next = pmc->tomb; 1457 pmc->tomb = psf; 1458 rv = 1; 1459 } else 1460 #endif 1461 kfree(psf); 1462 } 1463 return rv; 1464 } 1465 1466 #ifndef CONFIG_IP_MULTICAST 1467 #define igmp_ifc_event(x) do { } while (0) 1468 #endif 1469 1470 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1471 int sfcount, __be32 *psfsrc, int delta) 1472 { 1473 struct ip_mc_list *pmc; 1474 int changerec = 0; 1475 int i, err; 1476 1477 if (!in_dev) 1478 return -ENODEV; 1479 read_lock(&in_dev->mc_list_lock); 1480 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1481 if (*pmca == pmc->multiaddr) 1482 break; 1483 } 1484 if (!pmc) { 1485 /* MCA not found?? bug */ 1486 read_unlock(&in_dev->mc_list_lock); 1487 return -ESRCH; 1488 } 1489 spin_lock_bh(&pmc->lock); 1490 read_unlock(&in_dev->mc_list_lock); 1491 #ifdef CONFIG_IP_MULTICAST 1492 sf_markstate(pmc); 1493 #endif 1494 if (!delta) { 1495 err = -EINVAL; 1496 if (!pmc->sfcount[sfmode]) 1497 goto out_unlock; 1498 pmc->sfcount[sfmode]--; 1499 } 1500 err = 0; 1501 for (i=0; i<sfcount; i++) { 1502 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1503 1504 changerec |= rv > 0; 1505 if (!err && rv < 0) 1506 err = rv; 1507 } 1508 if (pmc->sfmode == MCAST_EXCLUDE && 1509 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1510 pmc->sfcount[MCAST_INCLUDE]) { 1511 #ifdef CONFIG_IP_MULTICAST 1512 struct ip_sf_list *psf; 1513 #endif 1514 1515 /* filter mode change */ 1516 pmc->sfmode = MCAST_INCLUDE; 1517 #ifdef CONFIG_IP_MULTICAST 1518 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1519 IGMP_Unsolicited_Report_Count; 1520 in_dev->mr_ifc_count = pmc->crcount; 1521 for (psf=pmc->sources; psf; psf = psf->sf_next) 1522 psf->sf_crcount = 0; 1523 igmp_ifc_event(pmc->interface); 1524 } else if (sf_setstate(pmc) || changerec) { 1525 igmp_ifc_event(pmc->interface); 1526 #endif 1527 } 1528 out_unlock: 1529 spin_unlock_bh(&pmc->lock); 1530 return err; 1531 } 1532 1533 /* 1534 * Add multicast single-source filter to the interface list 1535 */ 1536 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1537 __be32 *psfsrc, int delta) 1538 { 1539 struct ip_sf_list *psf, *psf_prev; 1540 1541 psf_prev = NULL; 1542 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1543 if (psf->sf_inaddr == *psfsrc) 1544 break; 1545 psf_prev = psf; 1546 } 1547 if (!psf) { 1548 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1549 if (!psf) 1550 return -ENOBUFS; 1551 psf->sf_inaddr = *psfsrc; 1552 if (psf_prev) { 1553 psf_prev->sf_next = psf; 1554 } else 1555 pmc->sources = psf; 1556 } 1557 psf->sf_count[sfmode]++; 1558 if (psf->sf_count[sfmode] == 1) { 1559 ip_rt_multicast_event(pmc->interface); 1560 } 1561 return 0; 1562 } 1563 1564 #ifdef CONFIG_IP_MULTICAST 1565 static void sf_markstate(struct ip_mc_list *pmc) 1566 { 1567 struct ip_sf_list *psf; 1568 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1569 1570 for (psf=pmc->sources; psf; psf=psf->sf_next) 1571 if (pmc->sfcount[MCAST_EXCLUDE]) { 1572 psf->sf_oldin = mca_xcount == 1573 psf->sf_count[MCAST_EXCLUDE] && 1574 !psf->sf_count[MCAST_INCLUDE]; 1575 } else 1576 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1577 } 1578 1579 static int sf_setstate(struct ip_mc_list *pmc) 1580 { 1581 struct ip_sf_list *psf, *dpsf; 1582 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1583 int qrv = pmc->interface->mr_qrv; 1584 int new_in, rv; 1585 1586 rv = 0; 1587 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1588 if (pmc->sfcount[MCAST_EXCLUDE]) { 1589 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1590 !psf->sf_count[MCAST_INCLUDE]; 1591 } else 1592 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1593 if (new_in) { 1594 if (!psf->sf_oldin) { 1595 struct ip_sf_list *prev = NULL; 1596 1597 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1598 if (dpsf->sf_inaddr == psf->sf_inaddr) 1599 break; 1600 prev = dpsf; 1601 } 1602 if (dpsf) { 1603 if (prev) 1604 prev->sf_next = dpsf->sf_next; 1605 else 1606 pmc->tomb = dpsf->sf_next; 1607 kfree(dpsf); 1608 } 1609 psf->sf_crcount = qrv; 1610 rv++; 1611 } 1612 } else if (psf->sf_oldin) { 1613 1614 psf->sf_crcount = 0; 1615 /* 1616 * add or update "delete" records if an active filter 1617 * is now inactive 1618 */ 1619 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1620 if (dpsf->sf_inaddr == psf->sf_inaddr) 1621 break; 1622 if (!dpsf) { 1623 dpsf = (struct ip_sf_list *) 1624 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1625 if (!dpsf) 1626 continue; 1627 *dpsf = *psf; 1628 /* pmc->lock held by callers */ 1629 dpsf->sf_next = pmc->tomb; 1630 pmc->tomb = dpsf; 1631 } 1632 dpsf->sf_crcount = qrv; 1633 rv++; 1634 } 1635 } 1636 return rv; 1637 } 1638 #endif 1639 1640 /* 1641 * Add multicast source filter list to the interface list 1642 */ 1643 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1644 int sfcount, __be32 *psfsrc, int delta) 1645 { 1646 struct ip_mc_list *pmc; 1647 int isexclude; 1648 int i, err; 1649 1650 if (!in_dev) 1651 return -ENODEV; 1652 read_lock(&in_dev->mc_list_lock); 1653 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1654 if (*pmca == pmc->multiaddr) 1655 break; 1656 } 1657 if (!pmc) { 1658 /* MCA not found?? bug */ 1659 read_unlock(&in_dev->mc_list_lock); 1660 return -ESRCH; 1661 } 1662 spin_lock_bh(&pmc->lock); 1663 read_unlock(&in_dev->mc_list_lock); 1664 1665 #ifdef CONFIG_IP_MULTICAST 1666 sf_markstate(pmc); 1667 #endif 1668 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1669 if (!delta) 1670 pmc->sfcount[sfmode]++; 1671 err = 0; 1672 for (i=0; i<sfcount; i++) { 1673 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1674 if (err) 1675 break; 1676 } 1677 if (err) { 1678 int j; 1679 1680 pmc->sfcount[sfmode]--; 1681 for (j=0; j<i; j++) 1682 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1683 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1684 #ifdef CONFIG_IP_MULTICAST 1685 struct ip_sf_list *psf; 1686 in_dev = pmc->interface; 1687 #endif 1688 1689 /* filter mode change */ 1690 if (pmc->sfcount[MCAST_EXCLUDE]) 1691 pmc->sfmode = MCAST_EXCLUDE; 1692 else if (pmc->sfcount[MCAST_INCLUDE]) 1693 pmc->sfmode = MCAST_INCLUDE; 1694 #ifdef CONFIG_IP_MULTICAST 1695 /* else no filters; keep old mode for reports */ 1696 1697 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1698 IGMP_Unsolicited_Report_Count; 1699 in_dev->mr_ifc_count = pmc->crcount; 1700 for (psf=pmc->sources; psf; psf = psf->sf_next) 1701 psf->sf_crcount = 0; 1702 igmp_ifc_event(in_dev); 1703 } else if (sf_setstate(pmc)) { 1704 igmp_ifc_event(in_dev); 1705 #endif 1706 } 1707 spin_unlock_bh(&pmc->lock); 1708 return err; 1709 } 1710 1711 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1712 { 1713 struct ip_sf_list *psf, *nextpsf; 1714 1715 for (psf=pmc->tomb; psf; psf=nextpsf) { 1716 nextpsf = psf->sf_next; 1717 kfree(psf); 1718 } 1719 pmc->tomb = NULL; 1720 for (psf=pmc->sources; psf; psf=nextpsf) { 1721 nextpsf = psf->sf_next; 1722 kfree(psf); 1723 } 1724 pmc->sources = NULL; 1725 pmc->sfmode = MCAST_EXCLUDE; 1726 pmc->sfcount[MCAST_INCLUDE] = 0; 1727 pmc->sfcount[MCAST_EXCLUDE] = 1; 1728 } 1729 1730 1731 /* 1732 * Join a multicast group 1733 */ 1734 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1735 { 1736 int err; 1737 __be32 addr = imr->imr_multiaddr.s_addr; 1738 struct ip_mc_socklist *iml=NULL, *i; 1739 struct in_device *in_dev; 1740 struct inet_sock *inet = inet_sk(sk); 1741 struct net *net = sock_net(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(net, 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 struct net *net = sock_net(sk); 1813 __be32 group = imr->imr_multiaddr.s_addr; 1814 u32 ifindex; 1815 int ret = -EADDRNOTAVAIL; 1816 1817 rtnl_lock(); 1818 in_dev = ip_mc_find_dev(net, imr); 1819 ifindex = imr->imr_ifindex; 1820 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1821 if (iml->multi.imr_multiaddr.s_addr != group) 1822 continue; 1823 if (ifindex) { 1824 if (iml->multi.imr_ifindex != ifindex) 1825 continue; 1826 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1827 iml->multi.imr_address.s_addr) 1828 continue; 1829 1830 (void) ip_mc_leave_src(sk, iml, in_dev); 1831 1832 *imlp = iml->next; 1833 1834 if (in_dev) 1835 ip_mc_dec_group(in_dev, group); 1836 rtnl_unlock(); 1837 sock_kfree_s(sk, iml, sizeof(*iml)); 1838 return 0; 1839 } 1840 if (!in_dev) 1841 ret = -ENODEV; 1842 rtnl_unlock(); 1843 return ret; 1844 } 1845 1846 int ip_mc_source(int add, int omode, struct sock *sk, struct 1847 ip_mreq_source *mreqs, int ifindex) 1848 { 1849 int err; 1850 struct ip_mreqn imr; 1851 __be32 addr = mreqs->imr_multiaddr; 1852 struct ip_mc_socklist *pmc; 1853 struct in_device *in_dev = NULL; 1854 struct inet_sock *inet = inet_sk(sk); 1855 struct ip_sf_socklist *psl; 1856 struct net *net = sock_net(sk); 1857 int leavegroup = 0; 1858 int i, j, rv; 1859 1860 if (!ipv4_is_multicast(addr)) 1861 return -EINVAL; 1862 1863 rtnl_lock(); 1864 1865 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1866 imr.imr_address.s_addr = mreqs->imr_interface; 1867 imr.imr_ifindex = ifindex; 1868 in_dev = ip_mc_find_dev(net, &imr); 1869 1870 if (!in_dev) { 1871 err = -ENODEV; 1872 goto done; 1873 } 1874 err = -EADDRNOTAVAIL; 1875 1876 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1877 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1878 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1879 break; 1880 } 1881 if (!pmc) { /* must have a prior join */ 1882 err = -EINVAL; 1883 goto done; 1884 } 1885 /* if a source filter was set, must be the same mode as before */ 1886 if (pmc->sflist) { 1887 if (pmc->sfmode != omode) { 1888 err = -EINVAL; 1889 goto done; 1890 } 1891 } else if (pmc->sfmode != omode) { 1892 /* allow mode switches for empty-set filters */ 1893 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1894 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1895 NULL, 0); 1896 pmc->sfmode = omode; 1897 } 1898 1899 psl = pmc->sflist; 1900 if (!add) { 1901 if (!psl) 1902 goto done; /* err = -EADDRNOTAVAIL */ 1903 rv = !0; 1904 for (i=0; i<psl->sl_count; i++) { 1905 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1906 sizeof(__be32)); 1907 if (rv == 0) 1908 break; 1909 } 1910 if (rv) /* source not found */ 1911 goto done; /* err = -EADDRNOTAVAIL */ 1912 1913 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1914 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1915 leavegroup = 1; 1916 goto done; 1917 } 1918 1919 /* update the interface filter */ 1920 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1921 &mreqs->imr_sourceaddr, 1); 1922 1923 for (j=i+1; j<psl->sl_count; j++) 1924 psl->sl_addr[j-1] = psl->sl_addr[j]; 1925 psl->sl_count--; 1926 err = 0; 1927 goto done; 1928 } 1929 /* else, add a new source to the filter */ 1930 1931 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1932 err = -ENOBUFS; 1933 goto done; 1934 } 1935 if (!psl || psl->sl_count == psl->sl_max) { 1936 struct ip_sf_socklist *newpsl; 1937 int count = IP_SFBLOCK; 1938 1939 if (psl) 1940 count += psl->sl_max; 1941 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1942 if (!newpsl) { 1943 err = -ENOBUFS; 1944 goto done; 1945 } 1946 newpsl->sl_max = count; 1947 newpsl->sl_count = count - IP_SFBLOCK; 1948 if (psl) { 1949 for (i=0; i<psl->sl_count; i++) 1950 newpsl->sl_addr[i] = psl->sl_addr[i]; 1951 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1952 } 1953 pmc->sflist = psl = newpsl; 1954 } 1955 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1956 for (i=0; i<psl->sl_count; i++) { 1957 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1958 sizeof(__be32)); 1959 if (rv == 0) 1960 break; 1961 } 1962 if (rv == 0) /* address already there is an error */ 1963 goto done; 1964 for (j=psl->sl_count-1; j>=i; j--) 1965 psl->sl_addr[j+1] = psl->sl_addr[j]; 1966 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1967 psl->sl_count++; 1968 err = 0; 1969 /* update the interface list */ 1970 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1971 &mreqs->imr_sourceaddr, 1); 1972 done: 1973 rtnl_unlock(); 1974 if (leavegroup) 1975 return ip_mc_leave_group(sk, &imr); 1976 return err; 1977 } 1978 1979 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1980 { 1981 int err = 0; 1982 struct ip_mreqn imr; 1983 __be32 addr = msf->imsf_multiaddr; 1984 struct ip_mc_socklist *pmc; 1985 struct in_device *in_dev; 1986 struct inet_sock *inet = inet_sk(sk); 1987 struct ip_sf_socklist *newpsl, *psl; 1988 struct net *net = sock_net(sk); 1989 int leavegroup = 0; 1990 1991 if (!ipv4_is_multicast(addr)) 1992 return -EINVAL; 1993 if (msf->imsf_fmode != MCAST_INCLUDE && 1994 msf->imsf_fmode != MCAST_EXCLUDE) 1995 return -EINVAL; 1996 1997 rtnl_lock(); 1998 1999 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2000 imr.imr_address.s_addr = msf->imsf_interface; 2001 imr.imr_ifindex = ifindex; 2002 in_dev = ip_mc_find_dev(net, &imr); 2003 2004 if (!in_dev) { 2005 err = -ENODEV; 2006 goto done; 2007 } 2008 2009 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2010 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2011 leavegroup = 1; 2012 goto done; 2013 } 2014 2015 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2016 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2017 pmc->multi.imr_ifindex == imr.imr_ifindex) 2018 break; 2019 } 2020 if (!pmc) { /* must have a prior join */ 2021 err = -EINVAL; 2022 goto done; 2023 } 2024 if (msf->imsf_numsrc) { 2025 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2026 GFP_KERNEL); 2027 if (!newpsl) { 2028 err = -ENOBUFS; 2029 goto done; 2030 } 2031 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2032 memcpy(newpsl->sl_addr, msf->imsf_slist, 2033 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2034 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2035 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2036 if (err) { 2037 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2038 goto done; 2039 } 2040 } else { 2041 newpsl = NULL; 2042 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2043 msf->imsf_fmode, 0, NULL, 0); 2044 } 2045 psl = pmc->sflist; 2046 if (psl) { 2047 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2048 psl->sl_count, psl->sl_addr, 0); 2049 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2050 } else 2051 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2052 0, NULL, 0); 2053 pmc->sflist = newpsl; 2054 pmc->sfmode = msf->imsf_fmode; 2055 err = 0; 2056 done: 2057 rtnl_unlock(); 2058 if (leavegroup) 2059 err = ip_mc_leave_group(sk, &imr); 2060 return err; 2061 } 2062 2063 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2064 struct ip_msfilter __user *optval, int __user *optlen) 2065 { 2066 int err, len, count, copycount; 2067 struct ip_mreqn imr; 2068 __be32 addr = msf->imsf_multiaddr; 2069 struct ip_mc_socklist *pmc; 2070 struct in_device *in_dev; 2071 struct inet_sock *inet = inet_sk(sk); 2072 struct ip_sf_socklist *psl; 2073 struct net *net = sock_net(sk); 2074 2075 if (!ipv4_is_multicast(addr)) 2076 return -EINVAL; 2077 2078 rtnl_lock(); 2079 2080 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2081 imr.imr_address.s_addr = msf->imsf_interface; 2082 imr.imr_ifindex = 0; 2083 in_dev = ip_mc_find_dev(net, &imr); 2084 2085 if (!in_dev) { 2086 err = -ENODEV; 2087 goto done; 2088 } 2089 err = -EADDRNOTAVAIL; 2090 2091 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2092 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2093 pmc->multi.imr_ifindex == imr.imr_ifindex) 2094 break; 2095 } 2096 if (!pmc) /* must have a prior join */ 2097 goto done; 2098 msf->imsf_fmode = pmc->sfmode; 2099 psl = pmc->sflist; 2100 rtnl_unlock(); 2101 if (!psl) { 2102 len = 0; 2103 count = 0; 2104 } else { 2105 count = psl->sl_count; 2106 } 2107 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2108 len = copycount * sizeof(psl->sl_addr[0]); 2109 msf->imsf_numsrc = count; 2110 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2111 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2112 return -EFAULT; 2113 } 2114 if (len && 2115 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2116 return -EFAULT; 2117 return 0; 2118 done: 2119 rtnl_unlock(); 2120 return err; 2121 } 2122 2123 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2124 struct group_filter __user *optval, int __user *optlen) 2125 { 2126 int err, i, count, copycount; 2127 struct sockaddr_in *psin; 2128 __be32 addr; 2129 struct ip_mc_socklist *pmc; 2130 struct inet_sock *inet = inet_sk(sk); 2131 struct ip_sf_socklist *psl; 2132 2133 psin = (struct sockaddr_in *)&gsf->gf_group; 2134 if (psin->sin_family != AF_INET) 2135 return -EINVAL; 2136 addr = psin->sin_addr.s_addr; 2137 if (!ipv4_is_multicast(addr)) 2138 return -EINVAL; 2139 2140 rtnl_lock(); 2141 2142 err = -EADDRNOTAVAIL; 2143 2144 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2145 if (pmc->multi.imr_multiaddr.s_addr == addr && 2146 pmc->multi.imr_ifindex == gsf->gf_interface) 2147 break; 2148 } 2149 if (!pmc) /* must have a prior join */ 2150 goto done; 2151 gsf->gf_fmode = pmc->sfmode; 2152 psl = pmc->sflist; 2153 rtnl_unlock(); 2154 count = psl ? psl->sl_count : 0; 2155 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2156 gsf->gf_numsrc = count; 2157 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2158 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2159 return -EFAULT; 2160 } 2161 for (i=0; i<copycount; i++) { 2162 struct sockaddr_storage ss; 2163 2164 psin = (struct sockaddr_in *)&ss; 2165 memset(&ss, 0, sizeof(ss)); 2166 psin->sin_family = AF_INET; 2167 psin->sin_addr.s_addr = psl->sl_addr[i]; 2168 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2169 return -EFAULT; 2170 } 2171 return 0; 2172 done: 2173 rtnl_unlock(); 2174 return err; 2175 } 2176 2177 /* 2178 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2179 */ 2180 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2181 { 2182 struct inet_sock *inet = inet_sk(sk); 2183 struct ip_mc_socklist *pmc; 2184 struct ip_sf_socklist *psl; 2185 int i; 2186 2187 if (!ipv4_is_multicast(loc_addr)) 2188 return 1; 2189 2190 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2191 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2192 pmc->multi.imr_ifindex == dif) 2193 break; 2194 } 2195 if (!pmc) 2196 return 1; 2197 psl = pmc->sflist; 2198 if (!psl) 2199 return pmc->sfmode == MCAST_EXCLUDE; 2200 2201 for (i=0; i<psl->sl_count; i++) { 2202 if (psl->sl_addr[i] == rmt_addr) 2203 break; 2204 } 2205 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2206 return 0; 2207 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2208 return 0; 2209 return 1; 2210 } 2211 2212 /* 2213 * A socket is closing. 2214 */ 2215 2216 void ip_mc_drop_socket(struct sock *sk) 2217 { 2218 struct inet_sock *inet = inet_sk(sk); 2219 struct ip_mc_socklist *iml; 2220 struct net *net = sock_net(sk); 2221 2222 if (inet->mc_list == NULL) 2223 return; 2224 2225 rtnl_lock(); 2226 while ((iml = inet->mc_list) != NULL) { 2227 struct in_device *in_dev; 2228 inet->mc_list = iml->next; 2229 2230 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2231 (void) ip_mc_leave_src(sk, iml, in_dev); 2232 if (in_dev != NULL) { 2233 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2234 in_dev_put(in_dev); 2235 } 2236 sock_kfree_s(sk, iml, sizeof(*iml)); 2237 } 2238 rtnl_unlock(); 2239 } 2240 2241 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2242 { 2243 struct ip_mc_list *im; 2244 struct ip_sf_list *psf; 2245 int rv = 0; 2246 2247 read_lock(&in_dev->mc_list_lock); 2248 for (im=in_dev->mc_list; im; im=im->next) { 2249 if (im->multiaddr == mc_addr) 2250 break; 2251 } 2252 if (im && proto == IPPROTO_IGMP) { 2253 rv = 1; 2254 } else if (im) { 2255 if (src_addr) { 2256 for (psf=im->sources; psf; psf=psf->sf_next) { 2257 if (psf->sf_inaddr == src_addr) 2258 break; 2259 } 2260 if (psf) 2261 rv = psf->sf_count[MCAST_INCLUDE] || 2262 psf->sf_count[MCAST_EXCLUDE] != 2263 im->sfcount[MCAST_EXCLUDE]; 2264 else 2265 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2266 } else 2267 rv = 1; /* unspecified source; tentatively allow */ 2268 } 2269 read_unlock(&in_dev->mc_list_lock); 2270 return rv; 2271 } 2272 2273 #if defined(CONFIG_PROC_FS) 2274 struct igmp_mc_iter_state { 2275 struct net_device *dev; 2276 struct in_device *in_dev; 2277 }; 2278 2279 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2280 2281 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2282 { 2283 struct ip_mc_list *im = NULL; 2284 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2285 2286 state->in_dev = NULL; 2287 for_each_netdev(&init_net, state->dev) { 2288 struct in_device *in_dev; 2289 in_dev = in_dev_get(state->dev); 2290 if (!in_dev) 2291 continue; 2292 read_lock(&in_dev->mc_list_lock); 2293 im = in_dev->mc_list; 2294 if (im) { 2295 state->in_dev = in_dev; 2296 break; 2297 } 2298 read_unlock(&in_dev->mc_list_lock); 2299 in_dev_put(in_dev); 2300 } 2301 return im; 2302 } 2303 2304 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2305 { 2306 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2307 im = im->next; 2308 while (!im) { 2309 if (likely(state->in_dev != NULL)) { 2310 read_unlock(&state->in_dev->mc_list_lock); 2311 in_dev_put(state->in_dev); 2312 } 2313 state->dev = next_net_device(state->dev); 2314 if (!state->dev) { 2315 state->in_dev = NULL; 2316 break; 2317 } 2318 state->in_dev = in_dev_get(state->dev); 2319 if (!state->in_dev) 2320 continue; 2321 read_lock(&state->in_dev->mc_list_lock); 2322 im = state->in_dev->mc_list; 2323 } 2324 return im; 2325 } 2326 2327 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2328 { 2329 struct ip_mc_list *im = igmp_mc_get_first(seq); 2330 if (im) 2331 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2332 --pos; 2333 return pos ? NULL : im; 2334 } 2335 2336 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2337 __acquires(dev_base_lock) 2338 { 2339 read_lock(&dev_base_lock); 2340 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2341 } 2342 2343 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2344 { 2345 struct ip_mc_list *im; 2346 if (v == SEQ_START_TOKEN) 2347 im = igmp_mc_get_first(seq); 2348 else 2349 im = igmp_mc_get_next(seq, v); 2350 ++*pos; 2351 return im; 2352 } 2353 2354 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2355 __releases(dev_base_lock) 2356 { 2357 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2358 if (likely(state->in_dev != NULL)) { 2359 read_unlock(&state->in_dev->mc_list_lock); 2360 in_dev_put(state->in_dev); 2361 state->in_dev = NULL; 2362 } 2363 state->dev = NULL; 2364 read_unlock(&dev_base_lock); 2365 } 2366 2367 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2368 { 2369 if (v == SEQ_START_TOKEN) 2370 seq_puts(seq, 2371 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2372 else { 2373 struct ip_mc_list *im = (struct ip_mc_list *)v; 2374 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2375 char *querier; 2376 #ifdef CONFIG_IP_MULTICAST 2377 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2378 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2379 "V3"; 2380 #else 2381 querier = "NONE"; 2382 #endif 2383 2384 if (state->in_dev->mc_list == im) { 2385 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2386 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2387 } 2388 2389 seq_printf(seq, 2390 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2391 im->multiaddr, im->users, 2392 im->tm_running, im->tm_running ? 2393 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2394 im->reporter); 2395 } 2396 return 0; 2397 } 2398 2399 static const struct seq_operations igmp_mc_seq_ops = { 2400 .start = igmp_mc_seq_start, 2401 .next = igmp_mc_seq_next, 2402 .stop = igmp_mc_seq_stop, 2403 .show = igmp_mc_seq_show, 2404 }; 2405 2406 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2407 { 2408 return seq_open_private(file, &igmp_mc_seq_ops, 2409 sizeof(struct igmp_mc_iter_state)); 2410 } 2411 2412 static const struct file_operations igmp_mc_seq_fops = { 2413 .owner = THIS_MODULE, 2414 .open = igmp_mc_seq_open, 2415 .read = seq_read, 2416 .llseek = seq_lseek, 2417 .release = seq_release_private, 2418 }; 2419 2420 struct igmp_mcf_iter_state { 2421 struct net_device *dev; 2422 struct in_device *idev; 2423 struct ip_mc_list *im; 2424 }; 2425 2426 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2427 2428 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2429 { 2430 struct ip_sf_list *psf = NULL; 2431 struct ip_mc_list *im = NULL; 2432 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2433 2434 state->idev = NULL; 2435 state->im = NULL; 2436 for_each_netdev(&init_net, state->dev) { 2437 struct in_device *idev; 2438 idev = in_dev_get(state->dev); 2439 if (unlikely(idev == NULL)) 2440 continue; 2441 read_lock(&idev->mc_list_lock); 2442 im = idev->mc_list; 2443 if (likely(im != NULL)) { 2444 spin_lock_bh(&im->lock); 2445 psf = im->sources; 2446 if (likely(psf != NULL)) { 2447 state->im = im; 2448 state->idev = idev; 2449 break; 2450 } 2451 spin_unlock_bh(&im->lock); 2452 } 2453 read_unlock(&idev->mc_list_lock); 2454 in_dev_put(idev); 2455 } 2456 return psf; 2457 } 2458 2459 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2460 { 2461 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2462 2463 psf = psf->sf_next; 2464 while (!psf) { 2465 spin_unlock_bh(&state->im->lock); 2466 state->im = state->im->next; 2467 while (!state->im) { 2468 if (likely(state->idev != NULL)) { 2469 read_unlock(&state->idev->mc_list_lock); 2470 in_dev_put(state->idev); 2471 } 2472 state->dev = next_net_device(state->dev); 2473 if (!state->dev) { 2474 state->idev = NULL; 2475 goto out; 2476 } 2477 state->idev = in_dev_get(state->dev); 2478 if (!state->idev) 2479 continue; 2480 read_lock(&state->idev->mc_list_lock); 2481 state->im = state->idev->mc_list; 2482 } 2483 if (!state->im) 2484 break; 2485 spin_lock_bh(&state->im->lock); 2486 psf = state->im->sources; 2487 } 2488 out: 2489 return psf; 2490 } 2491 2492 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2493 { 2494 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2495 if (psf) 2496 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2497 --pos; 2498 return pos ? NULL : psf; 2499 } 2500 2501 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2502 { 2503 read_lock(&dev_base_lock); 2504 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2505 } 2506 2507 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2508 { 2509 struct ip_sf_list *psf; 2510 if (v == SEQ_START_TOKEN) 2511 psf = igmp_mcf_get_first(seq); 2512 else 2513 psf = igmp_mcf_get_next(seq, v); 2514 ++*pos; 2515 return psf; 2516 } 2517 2518 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2519 { 2520 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2521 if (likely(state->im != NULL)) { 2522 spin_unlock_bh(&state->im->lock); 2523 state->im = NULL; 2524 } 2525 if (likely(state->idev != NULL)) { 2526 read_unlock(&state->idev->mc_list_lock); 2527 in_dev_put(state->idev); 2528 state->idev = NULL; 2529 } 2530 state->dev = NULL; 2531 read_unlock(&dev_base_lock); 2532 } 2533 2534 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2535 { 2536 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2537 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2538 2539 if (v == SEQ_START_TOKEN) { 2540 seq_printf(seq, 2541 "%3s %6s " 2542 "%10s %10s %6s %6s\n", "Idx", 2543 "Device", "MCA", 2544 "SRC", "INC", "EXC"); 2545 } else { 2546 seq_printf(seq, 2547 "%3d %6.6s 0x%08x " 2548 "0x%08x %6lu %6lu\n", 2549 state->dev->ifindex, state->dev->name, 2550 ntohl(state->im->multiaddr), 2551 ntohl(psf->sf_inaddr), 2552 psf->sf_count[MCAST_INCLUDE], 2553 psf->sf_count[MCAST_EXCLUDE]); 2554 } 2555 return 0; 2556 } 2557 2558 static const struct seq_operations igmp_mcf_seq_ops = { 2559 .start = igmp_mcf_seq_start, 2560 .next = igmp_mcf_seq_next, 2561 .stop = igmp_mcf_seq_stop, 2562 .show = igmp_mcf_seq_show, 2563 }; 2564 2565 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2566 { 2567 return seq_open_private(file, &igmp_mcf_seq_ops, 2568 sizeof(struct igmp_mcf_iter_state)); 2569 } 2570 2571 static const struct file_operations igmp_mcf_seq_fops = { 2572 .owner = THIS_MODULE, 2573 .open = igmp_mcf_seq_open, 2574 .read = seq_read, 2575 .llseek = seq_lseek, 2576 .release = seq_release_private, 2577 }; 2578 2579 int __init igmp_mc_proc_init(void) 2580 { 2581 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2582 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2583 return 0; 2584 } 2585 #endif 2586 2587 EXPORT_SYMBOL(ip_mc_dec_group); 2588 EXPORT_SYMBOL(ip_mc_inc_group); 2589 EXPORT_SYMBOL(ip_mc_join_group); 2590 EXPORT_SYMBOL(ip_mc_rejoin_group); 2591