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(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(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(&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 iphdr *pip = ip_hdr(skb); 353 struct igmphdr *pig = igmp_hdr(skb); 354 const int iplen = skb->tail - skb->network_header; 355 const int igmplen = skb->tail - skb->transport_header; 356 357 pip->tot_len = htons(iplen); 358 ip_send_check(pip); 359 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 360 361 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, 362 dst_output); 363 } 364 365 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 366 { 367 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); 368 } 369 370 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 371 int type, struct igmpv3_grec **ppgr) 372 { 373 struct net_device *dev = pmc->interface->dev; 374 struct igmpv3_report *pih; 375 struct igmpv3_grec *pgr; 376 377 if (!skb) 378 skb = igmpv3_newpack(dev, dev->mtu); 379 if (!skb) 380 return NULL; 381 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 382 pgr->grec_type = type; 383 pgr->grec_auxwords = 0; 384 pgr->grec_nsrcs = 0; 385 pgr->grec_mca = pmc->multiaddr; 386 pih = igmpv3_report_hdr(skb); 387 pih->ngrec = htons(ntohs(pih->ngrec)+1); 388 *ppgr = pgr; 389 return skb; 390 } 391 392 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 393 skb_tailroom(skb)) : 0) 394 395 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 396 int type, int gdeleted, int sdeleted) 397 { 398 struct net_device *dev = pmc->interface->dev; 399 struct igmpv3_report *pih; 400 struct igmpv3_grec *pgr = NULL; 401 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 402 int scount, stotal, first, isquery, truncate; 403 404 if (pmc->multiaddr == IGMP_ALL_HOSTS) 405 return skb; 406 407 isquery = type == IGMPV3_MODE_IS_INCLUDE || 408 type == IGMPV3_MODE_IS_EXCLUDE; 409 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 410 type == IGMPV3_CHANGE_TO_EXCLUDE; 411 412 stotal = scount = 0; 413 414 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 415 416 if (!*psf_list) 417 goto empty_source; 418 419 pih = skb ? igmpv3_report_hdr(skb) : NULL; 420 421 /* EX and TO_EX get a fresh packet, if needed */ 422 if (truncate) { 423 if (pih && pih->ngrec && 424 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 425 if (skb) 426 igmpv3_sendpack(skb); 427 skb = igmpv3_newpack(dev, dev->mtu); 428 } 429 } 430 first = 1; 431 psf_prev = NULL; 432 for (psf=*psf_list; psf; psf=psf_next) { 433 __be32 *psrc; 434 435 psf_next = psf->sf_next; 436 437 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 438 psf_prev = psf; 439 continue; 440 } 441 442 /* clear marks on query responses */ 443 if (isquery) 444 psf->sf_gsresp = 0; 445 446 if (AVAILABLE(skb) < sizeof(__be32) + 447 first*sizeof(struct igmpv3_grec)) { 448 if (truncate && !first) 449 break; /* truncate these */ 450 if (pgr) 451 pgr->grec_nsrcs = htons(scount); 452 if (skb) 453 igmpv3_sendpack(skb); 454 skb = igmpv3_newpack(dev, dev->mtu); 455 first = 1; 456 scount = 0; 457 } 458 if (first) { 459 skb = add_grhead(skb, pmc, type, &pgr); 460 first = 0; 461 } 462 if (!skb) 463 return NULL; 464 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 465 *psrc = psf->sf_inaddr; 466 scount++; stotal++; 467 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 468 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 469 psf->sf_crcount--; 470 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 471 if (psf_prev) 472 psf_prev->sf_next = psf->sf_next; 473 else 474 *psf_list = psf->sf_next; 475 kfree(psf); 476 continue; 477 } 478 } 479 psf_prev = psf; 480 } 481 482 empty_source: 483 if (!stotal) { 484 if (type == IGMPV3_ALLOW_NEW_SOURCES || 485 type == IGMPV3_BLOCK_OLD_SOURCES) 486 return skb; 487 if (pmc->crcount || isquery) { 488 /* make sure we have room for group header */ 489 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 490 igmpv3_sendpack(skb); 491 skb = NULL; /* add_grhead will get a new one */ 492 } 493 skb = add_grhead(skb, pmc, type, &pgr); 494 } 495 } 496 if (pgr) 497 pgr->grec_nsrcs = htons(scount); 498 499 if (isquery) 500 pmc->gsquery = 0; /* clear query state on report */ 501 return skb; 502 } 503 504 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 505 { 506 struct sk_buff *skb = NULL; 507 int type; 508 509 if (!pmc) { 510 read_lock(&in_dev->mc_list_lock); 511 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 512 if (pmc->multiaddr == IGMP_ALL_HOSTS) 513 continue; 514 spin_lock_bh(&pmc->lock); 515 if (pmc->sfcount[MCAST_EXCLUDE]) 516 type = IGMPV3_MODE_IS_EXCLUDE; 517 else 518 type = IGMPV3_MODE_IS_INCLUDE; 519 skb = add_grec(skb, pmc, type, 0, 0); 520 spin_unlock_bh(&pmc->lock); 521 } 522 read_unlock(&in_dev->mc_list_lock); 523 } else { 524 spin_lock_bh(&pmc->lock); 525 if (pmc->sfcount[MCAST_EXCLUDE]) 526 type = IGMPV3_MODE_IS_EXCLUDE; 527 else 528 type = IGMPV3_MODE_IS_INCLUDE; 529 skb = add_grec(skb, pmc, type, 0, 0); 530 spin_unlock_bh(&pmc->lock); 531 } 532 if (!skb) 533 return 0; 534 return igmpv3_sendpack(skb); 535 } 536 537 /* 538 * remove zero-count source records from a source filter list 539 */ 540 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 541 { 542 struct ip_sf_list *psf_prev, *psf_next, *psf; 543 544 psf_prev = NULL; 545 for (psf=*ppsf; psf; psf = psf_next) { 546 psf_next = psf->sf_next; 547 if (psf->sf_crcount == 0) { 548 if (psf_prev) 549 psf_prev->sf_next = psf->sf_next; 550 else 551 *ppsf = psf->sf_next; 552 kfree(psf); 553 } else 554 psf_prev = psf; 555 } 556 } 557 558 static void igmpv3_send_cr(struct in_device *in_dev) 559 { 560 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 561 struct sk_buff *skb = NULL; 562 int type, dtype; 563 564 read_lock(&in_dev->mc_list_lock); 565 spin_lock_bh(&in_dev->mc_tomb_lock); 566 567 /* deleted MCA's */ 568 pmc_prev = NULL; 569 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 570 pmc_next = pmc->next; 571 if (pmc->sfmode == MCAST_INCLUDE) { 572 type = IGMPV3_BLOCK_OLD_SOURCES; 573 dtype = IGMPV3_BLOCK_OLD_SOURCES; 574 skb = add_grec(skb, pmc, type, 1, 0); 575 skb = add_grec(skb, pmc, dtype, 1, 1); 576 } 577 if (pmc->crcount) { 578 if (pmc->sfmode == MCAST_EXCLUDE) { 579 type = IGMPV3_CHANGE_TO_INCLUDE; 580 skb = add_grec(skb, pmc, type, 1, 0); 581 } 582 pmc->crcount--; 583 if (pmc->crcount == 0) { 584 igmpv3_clear_zeros(&pmc->tomb); 585 igmpv3_clear_zeros(&pmc->sources); 586 } 587 } 588 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 589 if (pmc_prev) 590 pmc_prev->next = pmc_next; 591 else 592 in_dev->mc_tomb = pmc_next; 593 in_dev_put(pmc->interface); 594 kfree(pmc); 595 } else 596 pmc_prev = pmc; 597 } 598 spin_unlock_bh(&in_dev->mc_tomb_lock); 599 600 /* change recs */ 601 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 602 spin_lock_bh(&pmc->lock); 603 if (pmc->sfcount[MCAST_EXCLUDE]) { 604 type = IGMPV3_BLOCK_OLD_SOURCES; 605 dtype = IGMPV3_ALLOW_NEW_SOURCES; 606 } else { 607 type = IGMPV3_ALLOW_NEW_SOURCES; 608 dtype = IGMPV3_BLOCK_OLD_SOURCES; 609 } 610 skb = add_grec(skb, pmc, type, 0, 0); 611 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 612 613 /* filter mode changes */ 614 if (pmc->crcount) { 615 if (pmc->sfmode == MCAST_EXCLUDE) 616 type = IGMPV3_CHANGE_TO_EXCLUDE; 617 else 618 type = IGMPV3_CHANGE_TO_INCLUDE; 619 skb = add_grec(skb, pmc, type, 0, 0); 620 pmc->crcount--; 621 } 622 spin_unlock_bh(&pmc->lock); 623 } 624 read_unlock(&in_dev->mc_list_lock); 625 626 if (!skb) 627 return; 628 (void) igmpv3_sendpack(skb); 629 } 630 631 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 632 int type) 633 { 634 struct sk_buff *skb; 635 struct iphdr *iph; 636 struct igmphdr *ih; 637 struct rtable *rt; 638 struct net_device *dev = in_dev->dev; 639 __be32 group = pmc ? pmc->multiaddr : 0; 640 __be32 dst; 641 642 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 643 return igmpv3_send_report(in_dev, pmc); 644 else if (type == IGMP_HOST_LEAVE_MESSAGE) 645 dst = IGMP_ALL_ROUTER; 646 else 647 dst = group; 648 649 { 650 struct flowi fl = { .oif = dev->ifindex, 651 .nl_u = { .ip4_u = { .daddr = dst } }, 652 .proto = IPPROTO_IGMP }; 653 if (ip_route_output_key(&rt, &fl)) 654 return -1; 655 } 656 if (rt->rt_src == 0) { 657 ip_rt_put(rt); 658 return -1; 659 } 660 661 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); 662 if (skb == NULL) { 663 ip_rt_put(rt); 664 return -1; 665 } 666 667 skb->dst = &rt->u.dst; 668 669 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 670 671 skb_reset_network_header(skb); 672 iph = ip_hdr(skb); 673 skb_put(skb, sizeof(struct iphdr) + 4); 674 675 iph->version = 4; 676 iph->ihl = (sizeof(struct iphdr)+4)>>2; 677 iph->tos = 0xc0; 678 iph->frag_off = htons(IP_DF); 679 iph->ttl = 1; 680 iph->daddr = dst; 681 iph->saddr = rt->rt_src; 682 iph->protocol = IPPROTO_IGMP; 683 iph->tot_len = htons(IGMP_SIZE); 684 ip_select_ident(iph, &rt->u.dst, NULL); 685 ((u8*)&iph[1])[0] = IPOPT_RA; 686 ((u8*)&iph[1])[1] = 4; 687 ((u8*)&iph[1])[2] = 0; 688 ((u8*)&iph[1])[3] = 0; 689 ip_send_check(iph); 690 691 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 692 ih->type=type; 693 ih->code=0; 694 ih->csum=0; 695 ih->group=group; 696 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 697 698 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 699 dst_output); 700 } 701 702 static void igmp_gq_timer_expire(unsigned long data) 703 { 704 struct in_device *in_dev = (struct in_device *)data; 705 706 in_dev->mr_gq_running = 0; 707 igmpv3_send_report(in_dev, NULL); 708 __in_dev_put(in_dev); 709 } 710 711 static void igmp_ifc_timer_expire(unsigned long data) 712 { 713 struct in_device *in_dev = (struct in_device *)data; 714 715 igmpv3_send_cr(in_dev); 716 if (in_dev->mr_ifc_count) { 717 in_dev->mr_ifc_count--; 718 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 719 } 720 __in_dev_put(in_dev); 721 } 722 723 static void igmp_ifc_event(struct in_device *in_dev) 724 { 725 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 726 return; 727 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 728 IGMP_Unsolicited_Report_Count; 729 igmp_ifc_start_timer(in_dev, 1); 730 } 731 732 733 static void igmp_timer_expire(unsigned long data) 734 { 735 struct ip_mc_list *im=(struct ip_mc_list *)data; 736 struct in_device *in_dev = im->interface; 737 738 spin_lock(&im->lock); 739 im->tm_running=0; 740 741 if (im->unsolicit_count) { 742 im->unsolicit_count--; 743 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 744 } 745 im->reporter = 1; 746 spin_unlock(&im->lock); 747 748 if (IGMP_V1_SEEN(in_dev)) 749 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 750 else if (IGMP_V2_SEEN(in_dev)) 751 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 752 else 753 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 754 755 ip_ma_put(im); 756 } 757 758 /* mark EXCLUDE-mode sources */ 759 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 760 { 761 struct ip_sf_list *psf; 762 int i, scount; 763 764 scount = 0; 765 for (psf=pmc->sources; psf; psf=psf->sf_next) { 766 if (scount == nsrcs) 767 break; 768 for (i=0; i<nsrcs; i++) { 769 /* skip inactive filters */ 770 if (pmc->sfcount[MCAST_INCLUDE] || 771 pmc->sfcount[MCAST_EXCLUDE] != 772 psf->sf_count[MCAST_EXCLUDE]) 773 continue; 774 if (srcs[i] == psf->sf_inaddr) { 775 scount++; 776 break; 777 } 778 } 779 } 780 pmc->gsquery = 0; 781 if (scount == nsrcs) /* all sources excluded */ 782 return 0; 783 return 1; 784 } 785 786 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 787 { 788 struct ip_sf_list *psf; 789 int i, scount; 790 791 if (pmc->sfmode == MCAST_EXCLUDE) 792 return igmp_xmarksources(pmc, nsrcs, srcs); 793 794 /* mark INCLUDE-mode sources */ 795 scount = 0; 796 for (psf=pmc->sources; psf; psf=psf->sf_next) { 797 if (scount == nsrcs) 798 break; 799 for (i=0; i<nsrcs; i++) 800 if (srcs[i] == psf->sf_inaddr) { 801 psf->sf_gsresp = 1; 802 scount++; 803 break; 804 } 805 } 806 if (!scount) { 807 pmc->gsquery = 0; 808 return 0; 809 } 810 pmc->gsquery = 1; 811 return 1; 812 } 813 814 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 815 { 816 struct ip_mc_list *im; 817 818 /* Timers are only set for non-local groups */ 819 820 if (group == IGMP_ALL_HOSTS) 821 return; 822 823 read_lock(&in_dev->mc_list_lock); 824 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 825 if (im->multiaddr == group) { 826 igmp_stop_timer(im); 827 break; 828 } 829 } 830 read_unlock(&in_dev->mc_list_lock); 831 } 832 833 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 834 int len) 835 { 836 struct igmphdr *ih = igmp_hdr(skb); 837 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 838 struct ip_mc_list *im; 839 __be32 group = ih->group; 840 int max_delay; 841 int mark = 0; 842 843 844 if (len == 8) { 845 if (ih->code == 0) { 846 /* Alas, old v1 router presents here. */ 847 848 max_delay = IGMP_Query_Response_Interval; 849 in_dev->mr_v1_seen = jiffies + 850 IGMP_V1_Router_Present_Timeout; 851 group = 0; 852 } else { 853 /* v2 router present */ 854 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 855 in_dev->mr_v2_seen = jiffies + 856 IGMP_V2_Router_Present_Timeout; 857 } 858 /* cancel the interface change timer */ 859 in_dev->mr_ifc_count = 0; 860 if (del_timer(&in_dev->mr_ifc_timer)) 861 __in_dev_put(in_dev); 862 /* clear deleted report items */ 863 igmpv3_clear_delrec(in_dev); 864 } else if (len < 12) { 865 return; /* ignore bogus packet; freed by caller */ 866 } else { /* v3 */ 867 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 868 return; 869 870 ih3 = igmpv3_query_hdr(skb); 871 if (ih3->nsrcs) { 872 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 873 + ntohs(ih3->nsrcs)*sizeof(__be32))) 874 return; 875 ih3 = igmpv3_query_hdr(skb); 876 } 877 878 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 879 if (!max_delay) 880 max_delay = 1; /* can't mod w/ 0 */ 881 in_dev->mr_maxdelay = max_delay; 882 if (ih3->qrv) 883 in_dev->mr_qrv = ih3->qrv; 884 if (!group) { /* general query */ 885 if (ih3->nsrcs) 886 return; /* no sources allowed */ 887 igmp_gq_start_timer(in_dev); 888 return; 889 } 890 /* mark sources to include, if group & source-specific */ 891 mark = ih3->nsrcs != 0; 892 } 893 894 /* 895 * - Start the timers in all of our membership records 896 * that the query applies to for the interface on 897 * which the query arrived excl. those that belong 898 * to a "local" group (224.0.0.X) 899 * - For timers already running check if they need to 900 * be reset. 901 * - Use the igmp->igmp_code field as the maximum 902 * delay possible 903 */ 904 read_lock(&in_dev->mc_list_lock); 905 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 906 int changed; 907 908 if (group && group != im->multiaddr) 909 continue; 910 if (im->multiaddr == IGMP_ALL_HOSTS) 911 continue; 912 spin_lock_bh(&im->lock); 913 if (im->tm_running) 914 im->gsquery = im->gsquery && mark; 915 else 916 im->gsquery = mark; 917 changed = !im->gsquery || 918 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 919 spin_unlock_bh(&im->lock); 920 if (changed) 921 igmp_mod_timer(im, max_delay); 922 } 923 read_unlock(&in_dev->mc_list_lock); 924 } 925 926 int igmp_rcv(struct sk_buff *skb) 927 { 928 /* This basically follows the spec line by line -- see RFC1112 */ 929 struct igmphdr *ih; 930 struct in_device *in_dev = in_dev_get(skb->dev); 931 int len = skb->len; 932 933 if (in_dev==NULL) { 934 kfree_skb(skb); 935 return 0; 936 } 937 938 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 939 goto drop; 940 941 switch (skb->ip_summed) { 942 case CHECKSUM_COMPLETE: 943 if (!csum_fold(skb->csum)) 944 break; 945 /* fall through */ 946 case CHECKSUM_NONE: 947 skb->csum = 0; 948 if (__skb_checksum_complete(skb)) 949 goto drop; 950 } 951 952 ih = igmp_hdr(skb); 953 switch (ih->type) { 954 case IGMP_HOST_MEMBERSHIP_QUERY: 955 igmp_heard_query(in_dev, skb, len); 956 break; 957 case IGMP_HOST_MEMBERSHIP_REPORT: 958 case IGMPV2_HOST_MEMBERSHIP_REPORT: 959 case IGMPV3_HOST_MEMBERSHIP_REPORT: 960 /* Is it our report looped back? */ 961 if (((struct rtable*)skb->dst)->fl.iif == 0) 962 break; 963 /* don't rely on MC router hearing unicast reports */ 964 if (skb->pkt_type == PACKET_MULTICAST || 965 skb->pkt_type == PACKET_BROADCAST) 966 igmp_heard_report(in_dev, ih->group); 967 break; 968 case IGMP_PIM: 969 #ifdef CONFIG_IP_PIMSM_V1 970 in_dev_put(in_dev); 971 return pim_rcv_v1(skb); 972 #endif 973 case IGMP_DVMRP: 974 case IGMP_TRACE: 975 case IGMP_HOST_LEAVE_MESSAGE: 976 case IGMP_MTRACE: 977 case IGMP_MTRACE_RESP: 978 break; 979 default: 980 break; 981 } 982 983 drop: 984 in_dev_put(in_dev); 985 kfree_skb(skb); 986 return 0; 987 } 988 989 #endif 990 991 992 /* 993 * Add a filter to a device 994 */ 995 996 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 997 { 998 char buf[MAX_ADDR_LEN]; 999 struct net_device *dev = in_dev->dev; 1000 1001 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1002 We will get multicast token leakage, when IFF_MULTICAST 1003 is changed. This check should be done in dev->set_multicast_list 1004 routine. Something sort of: 1005 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1006 --ANK 1007 */ 1008 if (arp_mc_map(addr, buf, dev, 0) == 0) 1009 dev_mc_add(dev,buf,dev->addr_len,0); 1010 } 1011 1012 /* 1013 * Remove a filter from a device 1014 */ 1015 1016 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1017 { 1018 char buf[MAX_ADDR_LEN]; 1019 struct net_device *dev = in_dev->dev; 1020 1021 if (arp_mc_map(addr, buf, dev, 0) == 0) 1022 dev_mc_delete(dev,buf,dev->addr_len,0); 1023 } 1024 1025 #ifdef CONFIG_IP_MULTICAST 1026 /* 1027 * deleted ip_mc_list manipulation 1028 */ 1029 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1030 { 1031 struct ip_mc_list *pmc; 1032 1033 /* this is an "ip_mc_list" for convenience; only the fields below 1034 * are actually used. In particular, the refcnt and users are not 1035 * used for management of the delete list. Using the same structure 1036 * for deleted items allows change reports to use common code with 1037 * non-deleted or query-response MCA's. 1038 */ 1039 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1040 if (!pmc) 1041 return; 1042 spin_lock_bh(&im->lock); 1043 pmc->interface = im->interface; 1044 in_dev_hold(in_dev); 1045 pmc->multiaddr = im->multiaddr; 1046 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1047 IGMP_Unsolicited_Report_Count; 1048 pmc->sfmode = im->sfmode; 1049 if (pmc->sfmode == MCAST_INCLUDE) { 1050 struct ip_sf_list *psf; 1051 1052 pmc->tomb = im->tomb; 1053 pmc->sources = im->sources; 1054 im->tomb = im->sources = NULL; 1055 for (psf=pmc->sources; psf; psf=psf->sf_next) 1056 psf->sf_crcount = pmc->crcount; 1057 } 1058 spin_unlock_bh(&im->lock); 1059 1060 spin_lock_bh(&in_dev->mc_tomb_lock); 1061 pmc->next = in_dev->mc_tomb; 1062 in_dev->mc_tomb = pmc; 1063 spin_unlock_bh(&in_dev->mc_tomb_lock); 1064 } 1065 1066 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1067 { 1068 struct ip_mc_list *pmc, *pmc_prev; 1069 struct ip_sf_list *psf, *psf_next; 1070 1071 spin_lock_bh(&in_dev->mc_tomb_lock); 1072 pmc_prev = NULL; 1073 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1074 if (pmc->multiaddr == multiaddr) 1075 break; 1076 pmc_prev = pmc; 1077 } 1078 if (pmc) { 1079 if (pmc_prev) 1080 pmc_prev->next = pmc->next; 1081 else 1082 in_dev->mc_tomb = pmc->next; 1083 } 1084 spin_unlock_bh(&in_dev->mc_tomb_lock); 1085 if (pmc) { 1086 for (psf=pmc->tomb; psf; psf=psf_next) { 1087 psf_next = psf->sf_next; 1088 kfree(psf); 1089 } 1090 in_dev_put(pmc->interface); 1091 kfree(pmc); 1092 } 1093 } 1094 1095 static void igmpv3_clear_delrec(struct in_device *in_dev) 1096 { 1097 struct ip_mc_list *pmc, *nextpmc; 1098 1099 spin_lock_bh(&in_dev->mc_tomb_lock); 1100 pmc = in_dev->mc_tomb; 1101 in_dev->mc_tomb = NULL; 1102 spin_unlock_bh(&in_dev->mc_tomb_lock); 1103 1104 for (; pmc; pmc = nextpmc) { 1105 nextpmc = pmc->next; 1106 ip_mc_clear_src(pmc); 1107 in_dev_put(pmc->interface); 1108 kfree(pmc); 1109 } 1110 /* clear dead sources, too */ 1111 read_lock(&in_dev->mc_list_lock); 1112 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1113 struct ip_sf_list *psf, *psf_next; 1114 1115 spin_lock_bh(&pmc->lock); 1116 psf = pmc->tomb; 1117 pmc->tomb = NULL; 1118 spin_unlock_bh(&pmc->lock); 1119 for (; psf; psf=psf_next) { 1120 psf_next = psf->sf_next; 1121 kfree(psf); 1122 } 1123 } 1124 read_unlock(&in_dev->mc_list_lock); 1125 } 1126 #endif 1127 1128 static void igmp_group_dropped(struct ip_mc_list *im) 1129 { 1130 struct in_device *in_dev = im->interface; 1131 #ifdef CONFIG_IP_MULTICAST 1132 int reporter; 1133 #endif 1134 1135 if (im->loaded) { 1136 im->loaded = 0; 1137 ip_mc_filter_del(in_dev, im->multiaddr); 1138 } 1139 1140 #ifdef CONFIG_IP_MULTICAST 1141 if (im->multiaddr == IGMP_ALL_HOSTS) 1142 return; 1143 1144 reporter = im->reporter; 1145 igmp_stop_timer(im); 1146 1147 if (!in_dev->dead) { 1148 if (IGMP_V1_SEEN(in_dev)) 1149 goto done; 1150 if (IGMP_V2_SEEN(in_dev)) { 1151 if (reporter) 1152 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1153 goto done; 1154 } 1155 /* IGMPv3 */ 1156 igmpv3_add_delrec(in_dev, im); 1157 1158 igmp_ifc_event(in_dev); 1159 } 1160 done: 1161 #endif 1162 ip_mc_clear_src(im); 1163 } 1164 1165 static void igmp_group_added(struct ip_mc_list *im) 1166 { 1167 struct in_device *in_dev = im->interface; 1168 1169 if (im->loaded == 0) { 1170 im->loaded = 1; 1171 ip_mc_filter_add(in_dev, im->multiaddr); 1172 } 1173 1174 #ifdef CONFIG_IP_MULTICAST 1175 if (im->multiaddr == IGMP_ALL_HOSTS) 1176 return; 1177 1178 if (in_dev->dead) 1179 return; 1180 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1181 spin_lock_bh(&im->lock); 1182 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1183 spin_unlock_bh(&im->lock); 1184 return; 1185 } 1186 /* else, v3 */ 1187 1188 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1189 IGMP_Unsolicited_Report_Count; 1190 igmp_ifc_event(in_dev); 1191 #endif 1192 } 1193 1194 1195 /* 1196 * Multicast list managers 1197 */ 1198 1199 1200 /* 1201 * A socket has joined a multicast group on device dev. 1202 */ 1203 1204 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1205 { 1206 struct ip_mc_list *im; 1207 1208 ASSERT_RTNL(); 1209 1210 for (im=in_dev->mc_list; im; im=im->next) { 1211 if (im->multiaddr == addr) { 1212 im->users++; 1213 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1214 goto out; 1215 } 1216 } 1217 1218 im = kmalloc(sizeof(*im), GFP_KERNEL); 1219 if (!im) 1220 goto out; 1221 1222 im->users=1; 1223 im->interface=in_dev; 1224 in_dev_hold(in_dev); 1225 im->multiaddr=addr; 1226 /* initial mode is (EX, empty) */ 1227 im->sfmode = MCAST_EXCLUDE; 1228 im->sfcount[MCAST_INCLUDE] = 0; 1229 im->sfcount[MCAST_EXCLUDE] = 1; 1230 im->sources = NULL; 1231 im->tomb = NULL; 1232 im->crcount = 0; 1233 atomic_set(&im->refcnt, 1); 1234 spin_lock_init(&im->lock); 1235 #ifdef CONFIG_IP_MULTICAST 1236 im->tm_running=0; 1237 init_timer(&im->timer); 1238 im->timer.data=(unsigned long)im; 1239 im->timer.function=&igmp_timer_expire; 1240 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1241 im->reporter = 0; 1242 im->gsquery = 0; 1243 #endif 1244 im->loaded = 0; 1245 write_lock_bh(&in_dev->mc_list_lock); 1246 im->next=in_dev->mc_list; 1247 in_dev->mc_list=im; 1248 write_unlock_bh(&in_dev->mc_list_lock); 1249 #ifdef CONFIG_IP_MULTICAST 1250 igmpv3_del_delrec(in_dev, im->multiaddr); 1251 #endif 1252 igmp_group_added(im); 1253 if (!in_dev->dead) 1254 ip_rt_multicast_event(in_dev); 1255 out: 1256 return; 1257 } 1258 1259 /* 1260 * Resend IGMP JOIN report; used for bonding. 1261 */ 1262 void ip_mc_rejoin_group(struct ip_mc_list *im) 1263 { 1264 #ifdef CONFIG_IP_MULTICAST 1265 struct in_device *in_dev = im->interface; 1266 1267 if (im->multiaddr == IGMP_ALL_HOSTS) 1268 return; 1269 1270 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1271 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1272 return; 1273 } 1274 /* else, v3 */ 1275 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1276 IGMP_Unsolicited_Report_Count; 1277 igmp_ifc_event(in_dev); 1278 #endif 1279 } 1280 1281 /* 1282 * A socket has left a multicast group on device dev 1283 */ 1284 1285 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1286 { 1287 struct ip_mc_list *i, **ip; 1288 1289 ASSERT_RTNL(); 1290 1291 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1292 if (i->multiaddr==addr) { 1293 if (--i->users == 0) { 1294 write_lock_bh(&in_dev->mc_list_lock); 1295 *ip = i->next; 1296 write_unlock_bh(&in_dev->mc_list_lock); 1297 igmp_group_dropped(i); 1298 1299 if (!in_dev->dead) 1300 ip_rt_multicast_event(in_dev); 1301 1302 ip_ma_put(i); 1303 return; 1304 } 1305 break; 1306 } 1307 } 1308 } 1309 1310 /* Device going down */ 1311 1312 void ip_mc_down(struct in_device *in_dev) 1313 { 1314 struct ip_mc_list *i; 1315 1316 ASSERT_RTNL(); 1317 1318 for (i=in_dev->mc_list; i; i=i->next) 1319 igmp_group_dropped(i); 1320 1321 #ifdef CONFIG_IP_MULTICAST 1322 in_dev->mr_ifc_count = 0; 1323 if (del_timer(&in_dev->mr_ifc_timer)) 1324 __in_dev_put(in_dev); 1325 in_dev->mr_gq_running = 0; 1326 if (del_timer(&in_dev->mr_gq_timer)) 1327 __in_dev_put(in_dev); 1328 igmpv3_clear_delrec(in_dev); 1329 #endif 1330 1331 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1332 } 1333 1334 void ip_mc_init_dev(struct in_device *in_dev) 1335 { 1336 ASSERT_RTNL(); 1337 1338 in_dev->mc_tomb = NULL; 1339 #ifdef CONFIG_IP_MULTICAST 1340 in_dev->mr_gq_running = 0; 1341 init_timer(&in_dev->mr_gq_timer); 1342 in_dev->mr_gq_timer.data=(unsigned long) in_dev; 1343 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; 1344 in_dev->mr_ifc_count = 0; 1345 init_timer(&in_dev->mr_ifc_timer); 1346 in_dev->mr_ifc_timer.data=(unsigned long) in_dev; 1347 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; 1348 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1349 #endif 1350 1351 rwlock_init(&in_dev->mc_list_lock); 1352 spin_lock_init(&in_dev->mc_tomb_lock); 1353 } 1354 1355 /* Device going up */ 1356 1357 void ip_mc_up(struct in_device *in_dev) 1358 { 1359 struct ip_mc_list *i; 1360 1361 ASSERT_RTNL(); 1362 1363 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1364 1365 for (i=in_dev->mc_list; i; i=i->next) 1366 igmp_group_added(i); 1367 } 1368 1369 /* 1370 * Device is about to be destroyed: clean up. 1371 */ 1372 1373 void ip_mc_destroy_dev(struct in_device *in_dev) 1374 { 1375 struct ip_mc_list *i; 1376 1377 ASSERT_RTNL(); 1378 1379 /* Deactivate timers */ 1380 ip_mc_down(in_dev); 1381 1382 write_lock_bh(&in_dev->mc_list_lock); 1383 while ((i = in_dev->mc_list) != NULL) { 1384 in_dev->mc_list = i->next; 1385 write_unlock_bh(&in_dev->mc_list_lock); 1386 1387 igmp_group_dropped(i); 1388 ip_ma_put(i); 1389 1390 write_lock_bh(&in_dev->mc_list_lock); 1391 } 1392 write_unlock_bh(&in_dev->mc_list_lock); 1393 } 1394 1395 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) 1396 { 1397 struct flowi fl = { .nl_u = { .ip4_u = 1398 { .daddr = imr->imr_multiaddr.s_addr } } }; 1399 struct rtable *rt; 1400 struct net_device *dev = NULL; 1401 struct in_device *idev = NULL; 1402 1403 if (imr->imr_ifindex) { 1404 idev = inetdev_by_index(imr->imr_ifindex); 1405 if (idev) 1406 __in_dev_put(idev); 1407 return idev; 1408 } 1409 if (imr->imr_address.s_addr) { 1410 dev = ip_dev_find(imr->imr_address.s_addr); 1411 if (!dev) 1412 return NULL; 1413 dev_put(dev); 1414 } 1415 1416 if (!dev && !ip_route_output_key(&rt, &fl)) { 1417 dev = rt->u.dst.dev; 1418 ip_rt_put(rt); 1419 } 1420 if (dev) { 1421 imr->imr_ifindex = dev->ifindex; 1422 idev = __in_dev_get_rtnl(dev); 1423 } 1424 return idev; 1425 } 1426 1427 /* 1428 * Join a socket to a group 1429 */ 1430 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1431 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1432 1433 1434 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1435 __be32 *psfsrc) 1436 { 1437 struct ip_sf_list *psf, *psf_prev; 1438 int rv = 0; 1439 1440 psf_prev = NULL; 1441 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1442 if (psf->sf_inaddr == *psfsrc) 1443 break; 1444 psf_prev = psf; 1445 } 1446 if (!psf || psf->sf_count[sfmode] == 0) { 1447 /* source filter not found, or count wrong => bug */ 1448 return -ESRCH; 1449 } 1450 psf->sf_count[sfmode]--; 1451 if (psf->sf_count[sfmode] == 0) { 1452 ip_rt_multicast_event(pmc->interface); 1453 } 1454 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1455 #ifdef CONFIG_IP_MULTICAST 1456 struct in_device *in_dev = pmc->interface; 1457 #endif 1458 1459 /* no more filters for this source */ 1460 if (psf_prev) 1461 psf_prev->sf_next = psf->sf_next; 1462 else 1463 pmc->sources = psf->sf_next; 1464 #ifdef CONFIG_IP_MULTICAST 1465 if (psf->sf_oldin && 1466 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1467 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1468 IGMP_Unsolicited_Report_Count; 1469 psf->sf_next = pmc->tomb; 1470 pmc->tomb = psf; 1471 rv = 1; 1472 } else 1473 #endif 1474 kfree(psf); 1475 } 1476 return rv; 1477 } 1478 1479 #ifndef CONFIG_IP_MULTICAST 1480 #define igmp_ifc_event(x) do { } while (0) 1481 #endif 1482 1483 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1484 int sfcount, __be32 *psfsrc, int delta) 1485 { 1486 struct ip_mc_list *pmc; 1487 int changerec = 0; 1488 int i, err; 1489 1490 if (!in_dev) 1491 return -ENODEV; 1492 read_lock(&in_dev->mc_list_lock); 1493 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1494 if (*pmca == pmc->multiaddr) 1495 break; 1496 } 1497 if (!pmc) { 1498 /* MCA not found?? bug */ 1499 read_unlock(&in_dev->mc_list_lock); 1500 return -ESRCH; 1501 } 1502 spin_lock_bh(&pmc->lock); 1503 read_unlock(&in_dev->mc_list_lock); 1504 #ifdef CONFIG_IP_MULTICAST 1505 sf_markstate(pmc); 1506 #endif 1507 if (!delta) { 1508 err = -EINVAL; 1509 if (!pmc->sfcount[sfmode]) 1510 goto out_unlock; 1511 pmc->sfcount[sfmode]--; 1512 } 1513 err = 0; 1514 for (i=0; i<sfcount; i++) { 1515 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1516 1517 changerec |= rv > 0; 1518 if (!err && rv < 0) 1519 err = rv; 1520 } 1521 if (pmc->sfmode == MCAST_EXCLUDE && 1522 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1523 pmc->sfcount[MCAST_INCLUDE]) { 1524 #ifdef CONFIG_IP_MULTICAST 1525 struct ip_sf_list *psf; 1526 #endif 1527 1528 /* filter mode change */ 1529 pmc->sfmode = MCAST_INCLUDE; 1530 #ifdef CONFIG_IP_MULTICAST 1531 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1532 IGMP_Unsolicited_Report_Count; 1533 in_dev->mr_ifc_count = pmc->crcount; 1534 for (psf=pmc->sources; psf; psf = psf->sf_next) 1535 psf->sf_crcount = 0; 1536 igmp_ifc_event(pmc->interface); 1537 } else if (sf_setstate(pmc) || changerec) { 1538 igmp_ifc_event(pmc->interface); 1539 #endif 1540 } 1541 out_unlock: 1542 spin_unlock_bh(&pmc->lock); 1543 return err; 1544 } 1545 1546 /* 1547 * Add multicast single-source filter to the interface list 1548 */ 1549 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1550 __be32 *psfsrc, int delta) 1551 { 1552 struct ip_sf_list *psf, *psf_prev; 1553 1554 psf_prev = NULL; 1555 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1556 if (psf->sf_inaddr == *psfsrc) 1557 break; 1558 psf_prev = psf; 1559 } 1560 if (!psf) { 1561 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1562 if (!psf) 1563 return -ENOBUFS; 1564 psf->sf_inaddr = *psfsrc; 1565 if (psf_prev) { 1566 psf_prev->sf_next = psf; 1567 } else 1568 pmc->sources = psf; 1569 } 1570 psf->sf_count[sfmode]++; 1571 if (psf->sf_count[sfmode] == 1) { 1572 ip_rt_multicast_event(pmc->interface); 1573 } 1574 return 0; 1575 } 1576 1577 #ifdef CONFIG_IP_MULTICAST 1578 static void sf_markstate(struct ip_mc_list *pmc) 1579 { 1580 struct ip_sf_list *psf; 1581 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1582 1583 for (psf=pmc->sources; psf; psf=psf->sf_next) 1584 if (pmc->sfcount[MCAST_EXCLUDE]) { 1585 psf->sf_oldin = mca_xcount == 1586 psf->sf_count[MCAST_EXCLUDE] && 1587 !psf->sf_count[MCAST_INCLUDE]; 1588 } else 1589 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1590 } 1591 1592 static int sf_setstate(struct ip_mc_list *pmc) 1593 { 1594 struct ip_sf_list *psf, *dpsf; 1595 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1596 int qrv = pmc->interface->mr_qrv; 1597 int new_in, rv; 1598 1599 rv = 0; 1600 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1601 if (pmc->sfcount[MCAST_EXCLUDE]) { 1602 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1603 !psf->sf_count[MCAST_INCLUDE]; 1604 } else 1605 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1606 if (new_in) { 1607 if (!psf->sf_oldin) { 1608 struct ip_sf_list *prev = NULL; 1609 1610 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1611 if (dpsf->sf_inaddr == psf->sf_inaddr) 1612 break; 1613 prev = dpsf; 1614 } 1615 if (dpsf) { 1616 if (prev) 1617 prev->sf_next = dpsf->sf_next; 1618 else 1619 pmc->tomb = dpsf->sf_next; 1620 kfree(dpsf); 1621 } 1622 psf->sf_crcount = qrv; 1623 rv++; 1624 } 1625 } else if (psf->sf_oldin) { 1626 1627 psf->sf_crcount = 0; 1628 /* 1629 * add or update "delete" records if an active filter 1630 * is now inactive 1631 */ 1632 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1633 if (dpsf->sf_inaddr == psf->sf_inaddr) 1634 break; 1635 if (!dpsf) { 1636 dpsf = (struct ip_sf_list *) 1637 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1638 if (!dpsf) 1639 continue; 1640 *dpsf = *psf; 1641 /* pmc->lock held by callers */ 1642 dpsf->sf_next = pmc->tomb; 1643 pmc->tomb = dpsf; 1644 } 1645 dpsf->sf_crcount = qrv; 1646 rv++; 1647 } 1648 } 1649 return rv; 1650 } 1651 #endif 1652 1653 /* 1654 * Add multicast source filter list to the interface list 1655 */ 1656 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1657 int sfcount, __be32 *psfsrc, int delta) 1658 { 1659 struct ip_mc_list *pmc; 1660 int isexclude; 1661 int i, err; 1662 1663 if (!in_dev) 1664 return -ENODEV; 1665 read_lock(&in_dev->mc_list_lock); 1666 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1667 if (*pmca == pmc->multiaddr) 1668 break; 1669 } 1670 if (!pmc) { 1671 /* MCA not found?? bug */ 1672 read_unlock(&in_dev->mc_list_lock); 1673 return -ESRCH; 1674 } 1675 spin_lock_bh(&pmc->lock); 1676 read_unlock(&in_dev->mc_list_lock); 1677 1678 #ifdef CONFIG_IP_MULTICAST 1679 sf_markstate(pmc); 1680 #endif 1681 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1682 if (!delta) 1683 pmc->sfcount[sfmode]++; 1684 err = 0; 1685 for (i=0; i<sfcount; i++) { 1686 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1687 if (err) 1688 break; 1689 } 1690 if (err) { 1691 int j; 1692 1693 pmc->sfcount[sfmode]--; 1694 for (j=0; j<i; j++) 1695 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1696 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1697 #ifdef CONFIG_IP_MULTICAST 1698 struct ip_sf_list *psf; 1699 in_dev = pmc->interface; 1700 #endif 1701 1702 /* filter mode change */ 1703 if (pmc->sfcount[MCAST_EXCLUDE]) 1704 pmc->sfmode = MCAST_EXCLUDE; 1705 else if (pmc->sfcount[MCAST_INCLUDE]) 1706 pmc->sfmode = MCAST_INCLUDE; 1707 #ifdef CONFIG_IP_MULTICAST 1708 /* else no filters; keep old mode for reports */ 1709 1710 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1711 IGMP_Unsolicited_Report_Count; 1712 in_dev->mr_ifc_count = pmc->crcount; 1713 for (psf=pmc->sources; psf; psf = psf->sf_next) 1714 psf->sf_crcount = 0; 1715 igmp_ifc_event(in_dev); 1716 } else if (sf_setstate(pmc)) { 1717 igmp_ifc_event(in_dev); 1718 #endif 1719 } 1720 spin_unlock_bh(&pmc->lock); 1721 return err; 1722 } 1723 1724 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1725 { 1726 struct ip_sf_list *psf, *nextpsf; 1727 1728 for (psf=pmc->tomb; psf; psf=nextpsf) { 1729 nextpsf = psf->sf_next; 1730 kfree(psf); 1731 } 1732 pmc->tomb = NULL; 1733 for (psf=pmc->sources; psf; psf=nextpsf) { 1734 nextpsf = psf->sf_next; 1735 kfree(psf); 1736 } 1737 pmc->sources = NULL; 1738 pmc->sfmode = MCAST_EXCLUDE; 1739 pmc->sfcount[MCAST_INCLUDE] = 0; 1740 pmc->sfcount[MCAST_EXCLUDE] = 1; 1741 } 1742 1743 1744 /* 1745 * Join a multicast group 1746 */ 1747 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1748 { 1749 int err; 1750 __be32 addr = imr->imr_multiaddr.s_addr; 1751 struct ip_mc_socklist *iml=NULL, *i; 1752 struct in_device *in_dev; 1753 struct inet_sock *inet = inet_sk(sk); 1754 int ifindex; 1755 int count = 0; 1756 1757 if (!MULTICAST(addr)) 1758 return -EINVAL; 1759 1760 rtnl_lock(); 1761 1762 in_dev = ip_mc_find_dev(imr); 1763 1764 if (!in_dev) { 1765 iml = NULL; 1766 err = -ENODEV; 1767 goto done; 1768 } 1769 1770 err = -EADDRINUSE; 1771 ifindex = imr->imr_ifindex; 1772 for (i = inet->mc_list; i; i = i->next) { 1773 if (i->multi.imr_multiaddr.s_addr == addr && 1774 i->multi.imr_ifindex == ifindex) 1775 goto done; 1776 count++; 1777 } 1778 err = -ENOBUFS; 1779 if (count >= sysctl_igmp_max_memberships) 1780 goto done; 1781 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); 1782 if (iml == NULL) 1783 goto done; 1784 1785 memcpy(&iml->multi, imr, sizeof(*imr)); 1786 iml->next = inet->mc_list; 1787 iml->sflist = NULL; 1788 iml->sfmode = MCAST_EXCLUDE; 1789 inet->mc_list = iml; 1790 ip_mc_inc_group(in_dev, addr); 1791 err = 0; 1792 done: 1793 rtnl_unlock(); 1794 return err; 1795 } 1796 1797 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1798 struct in_device *in_dev) 1799 { 1800 int err; 1801 1802 if (iml->sflist == NULL) { 1803 /* any-source empty exclude case */ 1804 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1805 iml->sfmode, 0, NULL, 0); 1806 } 1807 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1808 iml->sfmode, iml->sflist->sl_count, 1809 iml->sflist->sl_addr, 0); 1810 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); 1811 iml->sflist = NULL; 1812 return err; 1813 } 1814 1815 /* 1816 * Ask a socket to leave a group. 1817 */ 1818 1819 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1820 { 1821 struct inet_sock *inet = inet_sk(sk); 1822 struct ip_mc_socklist *iml, **imlp; 1823 struct in_device *in_dev; 1824 __be32 group = imr->imr_multiaddr.s_addr; 1825 u32 ifindex; 1826 int ret = -EADDRNOTAVAIL; 1827 1828 rtnl_lock(); 1829 in_dev = ip_mc_find_dev(imr); 1830 ifindex = imr->imr_ifindex; 1831 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1832 if (iml->multi.imr_multiaddr.s_addr != group) 1833 continue; 1834 if (ifindex) { 1835 if (iml->multi.imr_ifindex != ifindex) 1836 continue; 1837 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1838 iml->multi.imr_address.s_addr) 1839 continue; 1840 1841 (void) ip_mc_leave_src(sk, iml, in_dev); 1842 1843 *imlp = iml->next; 1844 1845 if (in_dev) 1846 ip_mc_dec_group(in_dev, group); 1847 rtnl_unlock(); 1848 sock_kfree_s(sk, iml, sizeof(*iml)); 1849 return 0; 1850 } 1851 if (!in_dev) 1852 ret = -ENODEV; 1853 rtnl_unlock(); 1854 return ret; 1855 } 1856 1857 int ip_mc_source(int add, int omode, struct sock *sk, struct 1858 ip_mreq_source *mreqs, int ifindex) 1859 { 1860 int err; 1861 struct ip_mreqn imr; 1862 __be32 addr = mreqs->imr_multiaddr; 1863 struct ip_mc_socklist *pmc; 1864 struct in_device *in_dev = NULL; 1865 struct inet_sock *inet = inet_sk(sk); 1866 struct ip_sf_socklist *psl; 1867 int leavegroup = 0; 1868 int i, j, rv; 1869 1870 if (!MULTICAST(addr)) 1871 return -EINVAL; 1872 1873 rtnl_lock(); 1874 1875 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1876 imr.imr_address.s_addr = mreqs->imr_interface; 1877 imr.imr_ifindex = ifindex; 1878 in_dev = ip_mc_find_dev(&imr); 1879 1880 if (!in_dev) { 1881 err = -ENODEV; 1882 goto done; 1883 } 1884 err = -EADDRNOTAVAIL; 1885 1886 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1887 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr 1888 && pmc->multi.imr_ifindex == imr.imr_ifindex) 1889 break; 1890 } 1891 if (!pmc) { /* must have a prior join */ 1892 err = -EINVAL; 1893 goto done; 1894 } 1895 /* if a source filter was set, must be the same mode as before */ 1896 if (pmc->sflist) { 1897 if (pmc->sfmode != omode) { 1898 err = -EINVAL; 1899 goto done; 1900 } 1901 } else if (pmc->sfmode != omode) { 1902 /* allow mode switches for empty-set filters */ 1903 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1904 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1905 NULL, 0); 1906 pmc->sfmode = omode; 1907 } 1908 1909 psl = pmc->sflist; 1910 if (!add) { 1911 if (!psl) 1912 goto done; /* err = -EADDRNOTAVAIL */ 1913 rv = !0; 1914 for (i=0; i<psl->sl_count; i++) { 1915 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1916 sizeof(__be32)); 1917 if (rv == 0) 1918 break; 1919 } 1920 if (rv) /* source not found */ 1921 goto done; /* err = -EADDRNOTAVAIL */ 1922 1923 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1924 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1925 leavegroup = 1; 1926 goto done; 1927 } 1928 1929 /* update the interface filter */ 1930 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1931 &mreqs->imr_sourceaddr, 1); 1932 1933 for (j=i+1; j<psl->sl_count; j++) 1934 psl->sl_addr[j-1] = psl->sl_addr[j]; 1935 psl->sl_count--; 1936 err = 0; 1937 goto done; 1938 } 1939 /* else, add a new source to the filter */ 1940 1941 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1942 err = -ENOBUFS; 1943 goto done; 1944 } 1945 if (!psl || psl->sl_count == psl->sl_max) { 1946 struct ip_sf_socklist *newpsl; 1947 int count = IP_SFBLOCK; 1948 1949 if (psl) 1950 count += psl->sl_max; 1951 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1952 if (!newpsl) { 1953 err = -ENOBUFS; 1954 goto done; 1955 } 1956 newpsl->sl_max = count; 1957 newpsl->sl_count = count - IP_SFBLOCK; 1958 if (psl) { 1959 for (i=0; i<psl->sl_count; i++) 1960 newpsl->sl_addr[i] = psl->sl_addr[i]; 1961 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 1962 } 1963 pmc->sflist = psl = newpsl; 1964 } 1965 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 1966 for (i=0; i<psl->sl_count; i++) { 1967 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1968 sizeof(__be32)); 1969 if (rv == 0) 1970 break; 1971 } 1972 if (rv == 0) /* address already there is an error */ 1973 goto done; 1974 for (j=psl->sl_count-1; j>=i; j--) 1975 psl->sl_addr[j+1] = psl->sl_addr[j]; 1976 psl->sl_addr[i] = mreqs->imr_sourceaddr; 1977 psl->sl_count++; 1978 err = 0; 1979 /* update the interface list */ 1980 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1981 &mreqs->imr_sourceaddr, 1); 1982 done: 1983 rtnl_unlock(); 1984 if (leavegroup) 1985 return ip_mc_leave_group(sk, &imr); 1986 return err; 1987 } 1988 1989 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 1990 { 1991 int err = 0; 1992 struct ip_mreqn imr; 1993 __be32 addr = msf->imsf_multiaddr; 1994 struct ip_mc_socklist *pmc; 1995 struct in_device *in_dev; 1996 struct inet_sock *inet = inet_sk(sk); 1997 struct ip_sf_socklist *newpsl, *psl; 1998 int leavegroup = 0; 1999 2000 if (!MULTICAST(addr)) 2001 return -EINVAL; 2002 if (msf->imsf_fmode != MCAST_INCLUDE && 2003 msf->imsf_fmode != MCAST_EXCLUDE) 2004 return -EINVAL; 2005 2006 rtnl_lock(); 2007 2008 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2009 imr.imr_address.s_addr = msf->imsf_interface; 2010 imr.imr_ifindex = ifindex; 2011 in_dev = ip_mc_find_dev(&imr); 2012 2013 if (!in_dev) { 2014 err = -ENODEV; 2015 goto done; 2016 } 2017 2018 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2019 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2020 leavegroup = 1; 2021 goto done; 2022 } 2023 2024 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2025 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2026 pmc->multi.imr_ifindex == imr.imr_ifindex) 2027 break; 2028 } 2029 if (!pmc) { /* must have a prior join */ 2030 err = -EINVAL; 2031 goto done; 2032 } 2033 if (msf->imsf_numsrc) { 2034 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2035 GFP_KERNEL); 2036 if (!newpsl) { 2037 err = -ENOBUFS; 2038 goto done; 2039 } 2040 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2041 memcpy(newpsl->sl_addr, msf->imsf_slist, 2042 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2043 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2044 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2045 if (err) { 2046 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2047 goto done; 2048 } 2049 } else { 2050 newpsl = NULL; 2051 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2052 msf->imsf_fmode, 0, NULL, 0); 2053 } 2054 psl = pmc->sflist; 2055 if (psl) { 2056 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2057 psl->sl_count, psl->sl_addr, 0); 2058 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); 2059 } else 2060 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2061 0, NULL, 0); 2062 pmc->sflist = newpsl; 2063 pmc->sfmode = msf->imsf_fmode; 2064 err = 0; 2065 done: 2066 rtnl_unlock(); 2067 if (leavegroup) 2068 err = ip_mc_leave_group(sk, &imr); 2069 return err; 2070 } 2071 2072 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2073 struct ip_msfilter __user *optval, int __user *optlen) 2074 { 2075 int err, len, count, copycount; 2076 struct ip_mreqn imr; 2077 __be32 addr = msf->imsf_multiaddr; 2078 struct ip_mc_socklist *pmc; 2079 struct in_device *in_dev; 2080 struct inet_sock *inet = inet_sk(sk); 2081 struct ip_sf_socklist *psl; 2082 2083 if (!MULTICAST(addr)) 2084 return -EINVAL; 2085 2086 rtnl_lock(); 2087 2088 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2089 imr.imr_address.s_addr = msf->imsf_interface; 2090 imr.imr_ifindex = 0; 2091 in_dev = ip_mc_find_dev(&imr); 2092 2093 if (!in_dev) { 2094 err = -ENODEV; 2095 goto done; 2096 } 2097 err = -EADDRNOTAVAIL; 2098 2099 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2100 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2101 pmc->multi.imr_ifindex == imr.imr_ifindex) 2102 break; 2103 } 2104 if (!pmc) /* must have a prior join */ 2105 goto done; 2106 msf->imsf_fmode = pmc->sfmode; 2107 psl = pmc->sflist; 2108 rtnl_unlock(); 2109 if (!psl) { 2110 len = 0; 2111 count = 0; 2112 } else { 2113 count = psl->sl_count; 2114 } 2115 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2116 len = copycount * sizeof(psl->sl_addr[0]); 2117 msf->imsf_numsrc = count; 2118 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2119 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2120 return -EFAULT; 2121 } 2122 if (len && 2123 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2124 return -EFAULT; 2125 return 0; 2126 done: 2127 rtnl_unlock(); 2128 return err; 2129 } 2130 2131 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2132 struct group_filter __user *optval, int __user *optlen) 2133 { 2134 int err, i, count, copycount; 2135 struct sockaddr_in *psin; 2136 __be32 addr; 2137 struct ip_mc_socklist *pmc; 2138 struct inet_sock *inet = inet_sk(sk); 2139 struct ip_sf_socklist *psl; 2140 2141 psin = (struct sockaddr_in *)&gsf->gf_group; 2142 if (psin->sin_family != AF_INET) 2143 return -EINVAL; 2144 addr = psin->sin_addr.s_addr; 2145 if (!MULTICAST(addr)) 2146 return -EINVAL; 2147 2148 rtnl_lock(); 2149 2150 err = -EADDRNOTAVAIL; 2151 2152 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2153 if (pmc->multi.imr_multiaddr.s_addr == addr && 2154 pmc->multi.imr_ifindex == gsf->gf_interface) 2155 break; 2156 } 2157 if (!pmc) /* must have a prior join */ 2158 goto done; 2159 gsf->gf_fmode = pmc->sfmode; 2160 psl = pmc->sflist; 2161 rtnl_unlock(); 2162 count = psl ? psl->sl_count : 0; 2163 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2164 gsf->gf_numsrc = count; 2165 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2166 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2167 return -EFAULT; 2168 } 2169 for (i=0; i<copycount; i++) { 2170 struct sockaddr_storage ss; 2171 2172 psin = (struct sockaddr_in *)&ss; 2173 memset(&ss, 0, sizeof(ss)); 2174 psin->sin_family = AF_INET; 2175 psin->sin_addr.s_addr = psl->sl_addr[i]; 2176 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2177 return -EFAULT; 2178 } 2179 return 0; 2180 done: 2181 rtnl_unlock(); 2182 return err; 2183 } 2184 2185 /* 2186 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2187 */ 2188 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2189 { 2190 struct inet_sock *inet = inet_sk(sk); 2191 struct ip_mc_socklist *pmc; 2192 struct ip_sf_socklist *psl; 2193 int i; 2194 2195 if (!MULTICAST(loc_addr)) 2196 return 1; 2197 2198 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2199 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2200 pmc->multi.imr_ifindex == dif) 2201 break; 2202 } 2203 if (!pmc) 2204 return 1; 2205 psl = pmc->sflist; 2206 if (!psl) 2207 return pmc->sfmode == MCAST_EXCLUDE; 2208 2209 for (i=0; i<psl->sl_count; i++) { 2210 if (psl->sl_addr[i] == rmt_addr) 2211 break; 2212 } 2213 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2214 return 0; 2215 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2216 return 0; 2217 return 1; 2218 } 2219 2220 /* 2221 * A socket is closing. 2222 */ 2223 2224 void ip_mc_drop_socket(struct sock *sk) 2225 { 2226 struct inet_sock *inet = inet_sk(sk); 2227 struct ip_mc_socklist *iml; 2228 2229 if (inet->mc_list == NULL) 2230 return; 2231 2232 rtnl_lock(); 2233 while ((iml = inet->mc_list) != NULL) { 2234 struct in_device *in_dev; 2235 inet->mc_list = iml->next; 2236 2237 in_dev = inetdev_by_index(iml->multi.imr_ifindex); 2238 (void) ip_mc_leave_src(sk, iml, in_dev); 2239 if (in_dev != NULL) { 2240 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2241 in_dev_put(in_dev); 2242 } 2243 sock_kfree_s(sk, iml, sizeof(*iml)); 2244 } 2245 rtnl_unlock(); 2246 } 2247 2248 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2249 { 2250 struct ip_mc_list *im; 2251 struct ip_sf_list *psf; 2252 int rv = 0; 2253 2254 read_lock(&in_dev->mc_list_lock); 2255 for (im=in_dev->mc_list; im; im=im->next) { 2256 if (im->multiaddr == mc_addr) 2257 break; 2258 } 2259 if (im && proto == IPPROTO_IGMP) { 2260 rv = 1; 2261 } else if (im) { 2262 if (src_addr) { 2263 for (psf=im->sources; psf; psf=psf->sf_next) { 2264 if (psf->sf_inaddr == src_addr) 2265 break; 2266 } 2267 if (psf) 2268 rv = psf->sf_count[MCAST_INCLUDE] || 2269 psf->sf_count[MCAST_EXCLUDE] != 2270 im->sfcount[MCAST_EXCLUDE]; 2271 else 2272 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2273 } else 2274 rv = 1; /* unspecified source; tentatively allow */ 2275 } 2276 read_unlock(&in_dev->mc_list_lock); 2277 return rv; 2278 } 2279 2280 #if defined(CONFIG_PROC_FS) 2281 struct igmp_mc_iter_state { 2282 struct net_device *dev; 2283 struct in_device *in_dev; 2284 }; 2285 2286 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2287 2288 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2289 { 2290 struct ip_mc_list *im = NULL; 2291 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2292 2293 state->in_dev = NULL; 2294 for_each_netdev(&init_net, state->dev) { 2295 struct in_device *in_dev; 2296 in_dev = in_dev_get(state->dev); 2297 if (!in_dev) 2298 continue; 2299 read_lock(&in_dev->mc_list_lock); 2300 im = in_dev->mc_list; 2301 if (im) { 2302 state->in_dev = in_dev; 2303 break; 2304 } 2305 read_unlock(&in_dev->mc_list_lock); 2306 in_dev_put(in_dev); 2307 } 2308 return im; 2309 } 2310 2311 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2312 { 2313 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2314 im = im->next; 2315 while (!im) { 2316 if (likely(state->in_dev != NULL)) { 2317 read_unlock(&state->in_dev->mc_list_lock); 2318 in_dev_put(state->in_dev); 2319 } 2320 state->dev = next_net_device(state->dev); 2321 if (!state->dev) { 2322 state->in_dev = NULL; 2323 break; 2324 } 2325 state->in_dev = in_dev_get(state->dev); 2326 if (!state->in_dev) 2327 continue; 2328 read_lock(&state->in_dev->mc_list_lock); 2329 im = state->in_dev->mc_list; 2330 } 2331 return im; 2332 } 2333 2334 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2335 { 2336 struct ip_mc_list *im = igmp_mc_get_first(seq); 2337 if (im) 2338 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2339 --pos; 2340 return pos ? NULL : im; 2341 } 2342 2343 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2344 { 2345 read_lock(&dev_base_lock); 2346 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2347 } 2348 2349 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2350 { 2351 struct ip_mc_list *im; 2352 if (v == SEQ_START_TOKEN) 2353 im = igmp_mc_get_first(seq); 2354 else 2355 im = igmp_mc_get_next(seq, v); 2356 ++*pos; 2357 return im; 2358 } 2359 2360 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2361 { 2362 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2363 if (likely(state->in_dev != NULL)) { 2364 read_unlock(&state->in_dev->mc_list_lock); 2365 in_dev_put(state->in_dev); 2366 state->in_dev = NULL; 2367 } 2368 state->dev = NULL; 2369 read_unlock(&dev_base_lock); 2370 } 2371 2372 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2373 { 2374 if (v == SEQ_START_TOKEN) 2375 seq_puts(seq, 2376 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2377 else { 2378 struct ip_mc_list *im = (struct ip_mc_list *)v; 2379 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2380 char *querier; 2381 #ifdef CONFIG_IP_MULTICAST 2382 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2383 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2384 "V3"; 2385 #else 2386 querier = "NONE"; 2387 #endif 2388 2389 if (state->in_dev->mc_list == im) { 2390 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2391 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); 2392 } 2393 2394 seq_printf(seq, 2395 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2396 im->multiaddr, im->users, 2397 im->tm_running, im->tm_running ? 2398 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2399 im->reporter); 2400 } 2401 return 0; 2402 } 2403 2404 static const struct seq_operations igmp_mc_seq_ops = { 2405 .start = igmp_mc_seq_start, 2406 .next = igmp_mc_seq_next, 2407 .stop = igmp_mc_seq_stop, 2408 .show = igmp_mc_seq_show, 2409 }; 2410 2411 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2412 { 2413 return seq_open_private(file, &igmp_mc_seq_ops, 2414 sizeof(struct igmp_mc_iter_state)); 2415 } 2416 2417 static const struct file_operations igmp_mc_seq_fops = { 2418 .owner = THIS_MODULE, 2419 .open = igmp_mc_seq_open, 2420 .read = seq_read, 2421 .llseek = seq_lseek, 2422 .release = seq_release_private, 2423 }; 2424 2425 struct igmp_mcf_iter_state { 2426 struct net_device *dev; 2427 struct in_device *idev; 2428 struct ip_mc_list *im; 2429 }; 2430 2431 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2432 2433 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2434 { 2435 struct ip_sf_list *psf = NULL; 2436 struct ip_mc_list *im = NULL; 2437 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2438 2439 state->idev = NULL; 2440 state->im = NULL; 2441 for_each_netdev(&init_net, state->dev) { 2442 struct in_device *idev; 2443 idev = in_dev_get(state->dev); 2444 if (unlikely(idev == NULL)) 2445 continue; 2446 read_lock(&idev->mc_list_lock); 2447 im = idev->mc_list; 2448 if (likely(im != NULL)) { 2449 spin_lock_bh(&im->lock); 2450 psf = im->sources; 2451 if (likely(psf != NULL)) { 2452 state->im = im; 2453 state->idev = idev; 2454 break; 2455 } 2456 spin_unlock_bh(&im->lock); 2457 } 2458 read_unlock(&idev->mc_list_lock); 2459 in_dev_put(idev); 2460 } 2461 return psf; 2462 } 2463 2464 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2465 { 2466 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2467 2468 psf = psf->sf_next; 2469 while (!psf) { 2470 spin_unlock_bh(&state->im->lock); 2471 state->im = state->im->next; 2472 while (!state->im) { 2473 if (likely(state->idev != NULL)) { 2474 read_unlock(&state->idev->mc_list_lock); 2475 in_dev_put(state->idev); 2476 } 2477 state->dev = next_net_device(state->dev); 2478 if (!state->dev) { 2479 state->idev = NULL; 2480 goto out; 2481 } 2482 state->idev = in_dev_get(state->dev); 2483 if (!state->idev) 2484 continue; 2485 read_lock(&state->idev->mc_list_lock); 2486 state->im = state->idev->mc_list; 2487 } 2488 if (!state->im) 2489 break; 2490 spin_lock_bh(&state->im->lock); 2491 psf = state->im->sources; 2492 } 2493 out: 2494 return psf; 2495 } 2496 2497 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2498 { 2499 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2500 if (psf) 2501 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2502 --pos; 2503 return pos ? NULL : psf; 2504 } 2505 2506 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2507 { 2508 read_lock(&dev_base_lock); 2509 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2510 } 2511 2512 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2513 { 2514 struct ip_sf_list *psf; 2515 if (v == SEQ_START_TOKEN) 2516 psf = igmp_mcf_get_first(seq); 2517 else 2518 psf = igmp_mcf_get_next(seq, v); 2519 ++*pos; 2520 return psf; 2521 } 2522 2523 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2524 { 2525 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2526 if (likely(state->im != NULL)) { 2527 spin_unlock_bh(&state->im->lock); 2528 state->im = NULL; 2529 } 2530 if (likely(state->idev != NULL)) { 2531 read_unlock(&state->idev->mc_list_lock); 2532 in_dev_put(state->idev); 2533 state->idev = NULL; 2534 } 2535 state->dev = NULL; 2536 read_unlock(&dev_base_lock); 2537 } 2538 2539 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2540 { 2541 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2542 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2543 2544 if (v == SEQ_START_TOKEN) { 2545 seq_printf(seq, 2546 "%3s %6s " 2547 "%10s %10s %6s %6s\n", "Idx", 2548 "Device", "MCA", 2549 "SRC", "INC", "EXC"); 2550 } else { 2551 seq_printf(seq, 2552 "%3d %6.6s 0x%08x " 2553 "0x%08x %6lu %6lu\n", 2554 state->dev->ifindex, state->dev->name, 2555 ntohl(state->im->multiaddr), 2556 ntohl(psf->sf_inaddr), 2557 psf->sf_count[MCAST_INCLUDE], 2558 psf->sf_count[MCAST_EXCLUDE]); 2559 } 2560 return 0; 2561 } 2562 2563 static const struct seq_operations igmp_mcf_seq_ops = { 2564 .start = igmp_mcf_seq_start, 2565 .next = igmp_mcf_seq_next, 2566 .stop = igmp_mcf_seq_stop, 2567 .show = igmp_mcf_seq_show, 2568 }; 2569 2570 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2571 { 2572 return seq_open_private(file, &igmp_mcf_seq_ops, 2573 sizeof(struct igmp_mcf_iter_state)); 2574 } 2575 2576 static const struct file_operations igmp_mcf_seq_fops = { 2577 .owner = THIS_MODULE, 2578 .open = igmp_mcf_seq_open, 2579 .read = seq_read, 2580 .llseek = seq_lseek, 2581 .release = seq_release_private, 2582 }; 2583 2584 int __init igmp_mc_proc_init(void) 2585 { 2586 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2587 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2588 return 0; 2589 } 2590 #endif 2591 2592 EXPORT_SYMBOL(ip_mc_dec_group); 2593 EXPORT_SYMBOL(ip_mc_inc_group); 2594 EXPORT_SYMBOL(ip_mc_join_group); 2595 EXPORT_SYMBOL(ip_mc_rejoin_group); 2596