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@lxorguk.ukuu.org.uk> 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 <linux/slab.h> 75 #include <asm/uaccess.h> 76 #include <asm/system.h> 77 #include <linux/types.h> 78 #include <linux/kernel.h> 79 #include <linux/jiffies.h> 80 #include <linux/string.h> 81 #include <linux/socket.h> 82 #include <linux/sockios.h> 83 #include <linux/in.h> 84 #include <linux/inet.h> 85 #include <linux/netdevice.h> 86 #include <linux/skbuff.h> 87 #include <linux/inetdevice.h> 88 #include <linux/igmp.h> 89 #include <linux/if_arp.h> 90 #include <linux/rtnetlink.h> 91 #include <linux/times.h> 92 93 #include <net/net_namespace.h> 94 #include <net/arp.h> 95 #include <net/ip.h> 96 #include <net/protocol.h> 97 #include <net/route.h> 98 #include <net/sock.h> 99 #include <net/checksum.h> 100 #include <linux/netfilter_ipv4.h> 101 #ifdef CONFIG_IP_MROUTE 102 #include <linux/mroute.h> 103 #endif 104 #ifdef CONFIG_PROC_FS 105 #include <linux/proc_fs.h> 106 #include <linux/seq_file.h> 107 #endif 108 109 #define IP_MAX_MEMBERSHIPS 20 110 #define IP_MAX_MSF 10 111 112 #ifdef CONFIG_IP_MULTICAST 113 /* Parameter names and values are taken from igmp-v2-06 draft */ 114 115 #define IGMP_V1_Router_Present_Timeout (400*HZ) 116 #define IGMP_V2_Router_Present_Timeout (400*HZ) 117 #define IGMP_Unsolicited_Report_Interval (10*HZ) 118 #define IGMP_Query_Response_Interval (10*HZ) 119 #define IGMP_Unsolicited_Report_Count 2 120 121 122 #define IGMP_Initial_Report_Delay (1) 123 124 /* IGMP_Initial_Report_Delay is not from IGMP specs! 125 * IGMP specs require to report membership immediately after 126 * joining a group, but we delay the first report by a 127 * small interval. It seems more natural and still does not 128 * contradict to specs provided this delay is small enough. 129 */ 130 131 #define IGMP_V1_SEEN(in_dev) \ 132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 134 ((in_dev)->mr_v1_seen && \ 135 time_before(jiffies, (in_dev)->mr_v1_seen))) 136 #define IGMP_V2_SEEN(in_dev) \ 137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 139 ((in_dev)->mr_v2_seen && \ 140 time_before(jiffies, (in_dev)->mr_v2_seen))) 141 142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 144 static void igmpv3_clear_delrec(struct in_device *in_dev); 145 static int sf_setstate(struct ip_mc_list *pmc); 146 static void sf_markstate(struct ip_mc_list *pmc); 147 #endif 148 static void ip_mc_clear_src(struct ip_mc_list *pmc); 149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 150 int sfcount, __be32 *psfsrc, int delta); 151 152 static void ip_ma_put(struct ip_mc_list *im) 153 { 154 if (atomic_dec_and_test(&im->refcnt)) { 155 in_dev_put(im->interface); 156 kfree(im); 157 } 158 } 159 160 #ifdef CONFIG_IP_MULTICAST 161 162 /* 163 * Timer management 164 */ 165 166 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 167 { 168 spin_lock_bh(&im->lock); 169 if (del_timer(&im->timer)) 170 atomic_dec(&im->refcnt); 171 im->tm_running = 0; 172 im->reporter = 0; 173 im->unsolicit_count = 0; 174 spin_unlock_bh(&im->lock); 175 } 176 177 /* It must be called with locked im->lock */ 178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 179 { 180 int tv = net_random() % max_delay; 181 182 im->tm_running = 1; 183 if (!mod_timer(&im->timer, jiffies+tv+2)) 184 atomic_inc(&im->refcnt); 185 } 186 187 static void igmp_gq_start_timer(struct in_device *in_dev) 188 { 189 int tv = net_random() % in_dev->mr_maxdelay; 190 191 in_dev->mr_gq_running = 1; 192 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 193 in_dev_hold(in_dev); 194 } 195 196 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 197 { 198 int tv = net_random() % delay; 199 200 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 201 in_dev_hold(in_dev); 202 } 203 204 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 205 { 206 spin_lock_bh(&im->lock); 207 im->unsolicit_count = 0; 208 if (del_timer(&im->timer)) { 209 if ((long)(im->timer.expires-jiffies) < max_delay) { 210 add_timer(&im->timer); 211 im->tm_running = 1; 212 spin_unlock_bh(&im->lock); 213 return; 214 } 215 atomic_dec(&im->refcnt); 216 } 217 igmp_start_timer(im, max_delay); 218 spin_unlock_bh(&im->lock); 219 } 220 221 222 /* 223 * Send an IGMP report. 224 */ 225 226 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 227 228 229 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 230 int gdeleted, int sdeleted) 231 { 232 switch (type) { 233 case IGMPV3_MODE_IS_INCLUDE: 234 case IGMPV3_MODE_IS_EXCLUDE: 235 if (gdeleted || sdeleted) 236 return 0; 237 if (!(pmc->gsquery && !psf->sf_gsresp)) { 238 if (pmc->sfmode == MCAST_INCLUDE) 239 return 1; 240 /* don't include if this source is excluded 241 * in all filters 242 */ 243 if (psf->sf_count[MCAST_INCLUDE]) 244 return type == IGMPV3_MODE_IS_INCLUDE; 245 return pmc->sfcount[MCAST_EXCLUDE] == 246 psf->sf_count[MCAST_EXCLUDE]; 247 } 248 return 0; 249 case IGMPV3_CHANGE_TO_INCLUDE: 250 if (gdeleted || sdeleted) 251 return 0; 252 return psf->sf_count[MCAST_INCLUDE] != 0; 253 case IGMPV3_CHANGE_TO_EXCLUDE: 254 if (gdeleted || sdeleted) 255 return 0; 256 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 257 psf->sf_count[MCAST_INCLUDE]) 258 return 0; 259 return pmc->sfcount[MCAST_EXCLUDE] == 260 psf->sf_count[MCAST_EXCLUDE]; 261 case IGMPV3_ALLOW_NEW_SOURCES: 262 if (gdeleted || !psf->sf_crcount) 263 return 0; 264 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 265 case IGMPV3_BLOCK_OLD_SOURCES: 266 if (pmc->sfmode == MCAST_INCLUDE) 267 return gdeleted || (psf->sf_crcount && sdeleted); 268 return psf->sf_crcount && !gdeleted && !sdeleted; 269 } 270 return 0; 271 } 272 273 static int 274 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 275 { 276 struct ip_sf_list *psf; 277 int scount = 0; 278 279 for (psf=pmc->sources; psf; psf=psf->sf_next) { 280 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 281 continue; 282 scount++; 283 } 284 return scount; 285 } 286 287 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 288 { 289 struct sk_buff *skb; 290 struct rtable *rt; 291 struct iphdr *pip; 292 struct igmpv3_report *pig; 293 struct net *net = dev_net(dev); 294 295 skb = alloc_skb(size + LL_ALLOCATED_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(net, &rt, &fl)) { 305 kfree_skb(skb); 306 return NULL; 307 } 308 } 309 if (rt->rt_src == 0) { 310 kfree_skb(skb); 311 ip_rt_put(rt); 312 return NULL; 313 } 314 315 skb_dst_set(skb, &rt->u.dst); 316 skb->dev = dev; 317 318 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 319 320 skb_reset_network_header(skb); 321 pip = ip_hdr(skb); 322 skb_put(skb, sizeof(struct iphdr) + 4); 323 324 pip->version = 4; 325 pip->ihl = (sizeof(struct iphdr)+4)>>2; 326 pip->tos = 0xc0; 327 pip->frag_off = htons(IP_DF); 328 pip->ttl = 1; 329 pip->daddr = rt->rt_dst; 330 pip->saddr = rt->rt_src; 331 pip->protocol = IPPROTO_IGMP; 332 pip->tot_len = 0; /* filled in later */ 333 ip_select_ident(pip, &rt->u.dst, NULL); 334 ((u8*)&pip[1])[0] = IPOPT_RA; 335 ((u8*)&pip[1])[1] = 4; 336 ((u8*)&pip[1])[2] = 0; 337 ((u8*)&pip[1])[3] = 0; 338 339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 340 skb_put(skb, sizeof(*pig)); 341 pig = igmpv3_report_hdr(skb); 342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 343 pig->resv1 = 0; 344 pig->csum = 0; 345 pig->resv2 = 0; 346 pig->ngrec = 0; 347 return skb; 348 } 349 350 static int igmpv3_sendpack(struct sk_buff *skb) 351 { 352 struct igmphdr *pig = igmp_hdr(skb); 353 const int igmplen = skb->tail - skb->transport_header; 354 355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 356 357 return ip_local_out(skb); 358 } 359 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 361 { 362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 363 } 364 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 366 int type, struct igmpv3_grec **ppgr) 367 { 368 struct net_device *dev = pmc->interface->dev; 369 struct igmpv3_report *pih; 370 struct igmpv3_grec *pgr; 371 372 if (!skb) 373 skb = igmpv3_newpack(dev, dev->mtu); 374 if (!skb) 375 return NULL; 376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 377 pgr->grec_type = type; 378 pgr->grec_auxwords = 0; 379 pgr->grec_nsrcs = 0; 380 pgr->grec_mca = pmc->multiaddr; 381 pih = igmpv3_report_hdr(skb); 382 pih->ngrec = htons(ntohs(pih->ngrec)+1); 383 *ppgr = pgr; 384 return skb; 385 } 386 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 388 skb_tailroom(skb)) : 0) 389 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 391 int type, int gdeleted, int sdeleted) 392 { 393 struct net_device *dev = pmc->interface->dev; 394 struct igmpv3_report *pih; 395 struct igmpv3_grec *pgr = NULL; 396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 397 int scount, stotal, first, isquery, truncate; 398 399 if (pmc->multiaddr == IGMP_ALL_HOSTS) 400 return skb; 401 402 isquery = type == IGMPV3_MODE_IS_INCLUDE || 403 type == IGMPV3_MODE_IS_EXCLUDE; 404 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 405 type == IGMPV3_CHANGE_TO_EXCLUDE; 406 407 stotal = scount = 0; 408 409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 410 411 if (!*psf_list) 412 goto empty_source; 413 414 pih = skb ? igmpv3_report_hdr(skb) : NULL; 415 416 /* EX and TO_EX get a fresh packet, if needed */ 417 if (truncate) { 418 if (pih && pih->ngrec && 419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 420 if (skb) 421 igmpv3_sendpack(skb); 422 skb = igmpv3_newpack(dev, dev->mtu); 423 } 424 } 425 first = 1; 426 psf_prev = NULL; 427 for (psf=*psf_list; psf; psf=psf_next) { 428 __be32 *psrc; 429 430 psf_next = psf->sf_next; 431 432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 433 psf_prev = psf; 434 continue; 435 } 436 437 /* clear marks on query responses */ 438 if (isquery) 439 psf->sf_gsresp = 0; 440 441 if (AVAILABLE(skb) < sizeof(__be32) + 442 first*sizeof(struct igmpv3_grec)) { 443 if (truncate && !first) 444 break; /* truncate these */ 445 if (pgr) 446 pgr->grec_nsrcs = htons(scount); 447 if (skb) 448 igmpv3_sendpack(skb); 449 skb = igmpv3_newpack(dev, dev->mtu); 450 first = 1; 451 scount = 0; 452 } 453 if (first) { 454 skb = add_grhead(skb, pmc, type, &pgr); 455 first = 0; 456 } 457 if (!skb) 458 return NULL; 459 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 460 *psrc = psf->sf_inaddr; 461 scount++; stotal++; 462 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 464 psf->sf_crcount--; 465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 466 if (psf_prev) 467 psf_prev->sf_next = psf->sf_next; 468 else 469 *psf_list = psf->sf_next; 470 kfree(psf); 471 continue; 472 } 473 } 474 psf_prev = psf; 475 } 476 477 empty_source: 478 if (!stotal) { 479 if (type == IGMPV3_ALLOW_NEW_SOURCES || 480 type == IGMPV3_BLOCK_OLD_SOURCES) 481 return skb; 482 if (pmc->crcount || isquery) { 483 /* make sure we have room for group header */ 484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 485 igmpv3_sendpack(skb); 486 skb = NULL; /* add_grhead will get a new one */ 487 } 488 skb = add_grhead(skb, pmc, type, &pgr); 489 } 490 } 491 if (pgr) 492 pgr->grec_nsrcs = htons(scount); 493 494 if (isquery) 495 pmc->gsquery = 0; /* clear query state on report */ 496 return skb; 497 } 498 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 500 { 501 struct sk_buff *skb = NULL; 502 int type; 503 504 if (!pmc) { 505 read_lock(&in_dev->mc_list_lock); 506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 507 if (pmc->multiaddr == IGMP_ALL_HOSTS) 508 continue; 509 spin_lock_bh(&pmc->lock); 510 if (pmc->sfcount[MCAST_EXCLUDE]) 511 type = IGMPV3_MODE_IS_EXCLUDE; 512 else 513 type = IGMPV3_MODE_IS_INCLUDE; 514 skb = add_grec(skb, pmc, type, 0, 0); 515 spin_unlock_bh(&pmc->lock); 516 } 517 read_unlock(&in_dev->mc_list_lock); 518 } else { 519 spin_lock_bh(&pmc->lock); 520 if (pmc->sfcount[MCAST_EXCLUDE]) 521 type = IGMPV3_MODE_IS_EXCLUDE; 522 else 523 type = IGMPV3_MODE_IS_INCLUDE; 524 skb = add_grec(skb, pmc, type, 0, 0); 525 spin_unlock_bh(&pmc->lock); 526 } 527 if (!skb) 528 return 0; 529 return igmpv3_sendpack(skb); 530 } 531 532 /* 533 * remove zero-count source records from a source filter list 534 */ 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 536 { 537 struct ip_sf_list *psf_prev, *psf_next, *psf; 538 539 psf_prev = NULL; 540 for (psf=*ppsf; psf; psf = psf_next) { 541 psf_next = psf->sf_next; 542 if (psf->sf_crcount == 0) { 543 if (psf_prev) 544 psf_prev->sf_next = psf->sf_next; 545 else 546 *ppsf = psf->sf_next; 547 kfree(psf); 548 } else 549 psf_prev = psf; 550 } 551 } 552 553 static void igmpv3_send_cr(struct in_device *in_dev) 554 { 555 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 556 struct sk_buff *skb = NULL; 557 int type, dtype; 558 559 read_lock(&in_dev->mc_list_lock); 560 spin_lock_bh(&in_dev->mc_tomb_lock); 561 562 /* deleted MCA's */ 563 pmc_prev = NULL; 564 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 565 pmc_next = pmc->next; 566 if (pmc->sfmode == MCAST_INCLUDE) { 567 type = IGMPV3_BLOCK_OLD_SOURCES; 568 dtype = IGMPV3_BLOCK_OLD_SOURCES; 569 skb = add_grec(skb, pmc, type, 1, 0); 570 skb = add_grec(skb, pmc, dtype, 1, 1); 571 } 572 if (pmc->crcount) { 573 if (pmc->sfmode == MCAST_EXCLUDE) { 574 type = IGMPV3_CHANGE_TO_INCLUDE; 575 skb = add_grec(skb, pmc, type, 1, 0); 576 } 577 pmc->crcount--; 578 if (pmc->crcount == 0) { 579 igmpv3_clear_zeros(&pmc->tomb); 580 igmpv3_clear_zeros(&pmc->sources); 581 } 582 } 583 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 584 if (pmc_prev) 585 pmc_prev->next = pmc_next; 586 else 587 in_dev->mc_tomb = pmc_next; 588 in_dev_put(pmc->interface); 589 kfree(pmc); 590 } else 591 pmc_prev = pmc; 592 } 593 spin_unlock_bh(&in_dev->mc_tomb_lock); 594 595 /* change recs */ 596 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 597 spin_lock_bh(&pmc->lock); 598 if (pmc->sfcount[MCAST_EXCLUDE]) { 599 type = IGMPV3_BLOCK_OLD_SOURCES; 600 dtype = IGMPV3_ALLOW_NEW_SOURCES; 601 } else { 602 type = IGMPV3_ALLOW_NEW_SOURCES; 603 dtype = IGMPV3_BLOCK_OLD_SOURCES; 604 } 605 skb = add_grec(skb, pmc, type, 0, 0); 606 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 607 608 /* filter mode changes */ 609 if (pmc->crcount) { 610 if (pmc->sfmode == MCAST_EXCLUDE) 611 type = IGMPV3_CHANGE_TO_EXCLUDE; 612 else 613 type = IGMPV3_CHANGE_TO_INCLUDE; 614 skb = add_grec(skb, pmc, type, 0, 0); 615 pmc->crcount--; 616 } 617 spin_unlock_bh(&pmc->lock); 618 } 619 read_unlock(&in_dev->mc_list_lock); 620 621 if (!skb) 622 return; 623 (void) igmpv3_sendpack(skb); 624 } 625 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 627 int type) 628 { 629 struct sk_buff *skb; 630 struct iphdr *iph; 631 struct igmphdr *ih; 632 struct rtable *rt; 633 struct net_device *dev = in_dev->dev; 634 struct net *net = dev_net(dev); 635 __be32 group = pmc ? pmc->multiaddr : 0; 636 __be32 dst; 637 638 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 639 return igmpv3_send_report(in_dev, pmc); 640 else if (type == IGMP_HOST_LEAVE_MESSAGE) 641 dst = IGMP_ALL_ROUTER; 642 else 643 dst = group; 644 645 { 646 struct flowi fl = { .oif = dev->ifindex, 647 .nl_u = { .ip4_u = { .daddr = dst } }, 648 .proto = IPPROTO_IGMP }; 649 if (ip_route_output_key(net, &rt, &fl)) 650 return -1; 651 } 652 if (rt->rt_src == 0) { 653 ip_rt_put(rt); 654 return -1; 655 } 656 657 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 658 if (skb == NULL) { 659 ip_rt_put(rt); 660 return -1; 661 } 662 663 skb_dst_set(skb, &rt->u.dst); 664 665 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 666 667 skb_reset_network_header(skb); 668 iph = ip_hdr(skb); 669 skb_put(skb, sizeof(struct iphdr) + 4); 670 671 iph->version = 4; 672 iph->ihl = (sizeof(struct iphdr)+4)>>2; 673 iph->tos = 0xc0; 674 iph->frag_off = htons(IP_DF); 675 iph->ttl = 1; 676 iph->daddr = dst; 677 iph->saddr = rt->rt_src; 678 iph->protocol = IPPROTO_IGMP; 679 ip_select_ident(iph, &rt->u.dst, NULL); 680 ((u8*)&iph[1])[0] = IPOPT_RA; 681 ((u8*)&iph[1])[1] = 4; 682 ((u8*)&iph[1])[2] = 0; 683 ((u8*)&iph[1])[3] = 0; 684 685 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 686 ih->type = type; 687 ih->code = 0; 688 ih->csum = 0; 689 ih->group = group; 690 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 691 692 return ip_local_out(skb); 693 } 694 695 static void igmp_gq_timer_expire(unsigned long data) 696 { 697 struct in_device *in_dev = (struct in_device *)data; 698 699 in_dev->mr_gq_running = 0; 700 igmpv3_send_report(in_dev, NULL); 701 __in_dev_put(in_dev); 702 } 703 704 static void igmp_ifc_timer_expire(unsigned long data) 705 { 706 struct in_device *in_dev = (struct in_device *)data; 707 708 igmpv3_send_cr(in_dev); 709 if (in_dev->mr_ifc_count) { 710 in_dev->mr_ifc_count--; 711 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 712 } 713 __in_dev_put(in_dev); 714 } 715 716 static void igmp_ifc_event(struct in_device *in_dev) 717 { 718 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 719 return; 720 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 721 IGMP_Unsolicited_Report_Count; 722 igmp_ifc_start_timer(in_dev, 1); 723 } 724 725 726 static void igmp_timer_expire(unsigned long data) 727 { 728 struct ip_mc_list *im=(struct ip_mc_list *)data; 729 struct in_device *in_dev = im->interface; 730 731 spin_lock(&im->lock); 732 im->tm_running = 0; 733 734 if (im->unsolicit_count) { 735 im->unsolicit_count--; 736 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 737 } 738 im->reporter = 1; 739 spin_unlock(&im->lock); 740 741 if (IGMP_V1_SEEN(in_dev)) 742 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 743 else if (IGMP_V2_SEEN(in_dev)) 744 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 745 else 746 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 747 748 ip_ma_put(im); 749 } 750 751 /* mark EXCLUDE-mode sources */ 752 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 753 { 754 struct ip_sf_list *psf; 755 int i, scount; 756 757 scount = 0; 758 for (psf=pmc->sources; psf; psf=psf->sf_next) { 759 if (scount == nsrcs) 760 break; 761 for (i=0; i<nsrcs; i++) { 762 /* skip inactive filters */ 763 if (pmc->sfcount[MCAST_INCLUDE] || 764 pmc->sfcount[MCAST_EXCLUDE] != 765 psf->sf_count[MCAST_EXCLUDE]) 766 continue; 767 if (srcs[i] == psf->sf_inaddr) { 768 scount++; 769 break; 770 } 771 } 772 } 773 pmc->gsquery = 0; 774 if (scount == nsrcs) /* all sources excluded */ 775 return 0; 776 return 1; 777 } 778 779 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 780 { 781 struct ip_sf_list *psf; 782 int i, scount; 783 784 if (pmc->sfmode == MCAST_EXCLUDE) 785 return igmp_xmarksources(pmc, nsrcs, srcs); 786 787 /* mark INCLUDE-mode sources */ 788 scount = 0; 789 for (psf=pmc->sources; psf; psf=psf->sf_next) { 790 if (scount == nsrcs) 791 break; 792 for (i=0; i<nsrcs; i++) 793 if (srcs[i] == psf->sf_inaddr) { 794 psf->sf_gsresp = 1; 795 scount++; 796 break; 797 } 798 } 799 if (!scount) { 800 pmc->gsquery = 0; 801 return 0; 802 } 803 pmc->gsquery = 1; 804 return 1; 805 } 806 807 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 808 { 809 struct ip_mc_list *im; 810 811 /* Timers are only set for non-local groups */ 812 813 if (group == IGMP_ALL_HOSTS) 814 return; 815 816 read_lock(&in_dev->mc_list_lock); 817 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 818 if (im->multiaddr == group) { 819 igmp_stop_timer(im); 820 break; 821 } 822 } 823 read_unlock(&in_dev->mc_list_lock); 824 } 825 826 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 827 int len) 828 { 829 struct igmphdr *ih = igmp_hdr(skb); 830 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 831 struct ip_mc_list *im; 832 __be32 group = ih->group; 833 int max_delay; 834 int mark = 0; 835 836 837 if (len == 8) { 838 if (ih->code == 0) { 839 /* Alas, old v1 router presents here. */ 840 841 max_delay = IGMP_Query_Response_Interval; 842 in_dev->mr_v1_seen = jiffies + 843 IGMP_V1_Router_Present_Timeout; 844 group = 0; 845 } else { 846 /* v2 router present */ 847 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 848 in_dev->mr_v2_seen = jiffies + 849 IGMP_V2_Router_Present_Timeout; 850 } 851 /* cancel the interface change timer */ 852 in_dev->mr_ifc_count = 0; 853 if (del_timer(&in_dev->mr_ifc_timer)) 854 __in_dev_put(in_dev); 855 /* clear deleted report items */ 856 igmpv3_clear_delrec(in_dev); 857 } else if (len < 12) { 858 return; /* ignore bogus packet; freed by caller */ 859 } else { /* v3 */ 860 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 861 return; 862 863 ih3 = igmpv3_query_hdr(skb); 864 if (ih3->nsrcs) { 865 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 866 + ntohs(ih3->nsrcs)*sizeof(__be32))) 867 return; 868 ih3 = igmpv3_query_hdr(skb); 869 } 870 871 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 872 if (!max_delay) 873 max_delay = 1; /* can't mod w/ 0 */ 874 in_dev->mr_maxdelay = max_delay; 875 if (ih3->qrv) 876 in_dev->mr_qrv = ih3->qrv; 877 if (!group) { /* general query */ 878 if (ih3->nsrcs) 879 return; /* no sources allowed */ 880 igmp_gq_start_timer(in_dev); 881 return; 882 } 883 /* mark sources to include, if group & source-specific */ 884 mark = ih3->nsrcs != 0; 885 } 886 887 /* 888 * - Start the timers in all of our membership records 889 * that the query applies to for the interface on 890 * which the query arrived excl. those that belong 891 * to a "local" group (224.0.0.X) 892 * - For timers already running check if they need to 893 * be reset. 894 * - Use the igmp->igmp_code field as the maximum 895 * delay possible 896 */ 897 read_lock(&in_dev->mc_list_lock); 898 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 899 int changed; 900 901 if (group && group != im->multiaddr) 902 continue; 903 if (im->multiaddr == IGMP_ALL_HOSTS) 904 continue; 905 spin_lock_bh(&im->lock); 906 if (im->tm_running) 907 im->gsquery = im->gsquery && mark; 908 else 909 im->gsquery = mark; 910 changed = !im->gsquery || 911 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 912 spin_unlock_bh(&im->lock); 913 if (changed) 914 igmp_mod_timer(im, max_delay); 915 } 916 read_unlock(&in_dev->mc_list_lock); 917 } 918 919 int igmp_rcv(struct sk_buff *skb) 920 { 921 /* This basically follows the spec line by line -- see RFC1112 */ 922 struct igmphdr *ih; 923 struct in_device *in_dev = in_dev_get(skb->dev); 924 int len = skb->len; 925 926 if (in_dev == NULL) 927 goto drop; 928 929 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 930 goto drop_ref; 931 932 switch (skb->ip_summed) { 933 case CHECKSUM_COMPLETE: 934 if (!csum_fold(skb->csum)) 935 break; 936 /* fall through */ 937 case CHECKSUM_NONE: 938 skb->csum = 0; 939 if (__skb_checksum_complete(skb)) 940 goto drop_ref; 941 } 942 943 ih = igmp_hdr(skb); 944 switch (ih->type) { 945 case IGMP_HOST_MEMBERSHIP_QUERY: 946 igmp_heard_query(in_dev, skb, len); 947 break; 948 case IGMP_HOST_MEMBERSHIP_REPORT: 949 case IGMPV2_HOST_MEMBERSHIP_REPORT: 950 /* Is it our report looped back? */ 951 if (skb_rtable(skb)->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 IGMPV3_HOST_MEMBERSHIP_REPORT: 964 case IGMP_DVMRP: 965 case IGMP_TRACE: 966 case IGMP_HOST_LEAVE_MESSAGE: 967 case IGMP_MTRACE: 968 case IGMP_MTRACE_RESP: 969 break; 970 default: 971 break; 972 } 973 974 drop_ref: 975 in_dev_put(in_dev); 976 drop: 977 kfree_skb(skb); 978 return 0; 979 } 980 981 #endif 982 983 984 /* 985 * Add a filter to a device 986 */ 987 988 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 989 { 990 char buf[MAX_ADDR_LEN]; 991 struct net_device *dev = in_dev->dev; 992 993 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 994 We will get multicast token leakage, when IFF_MULTICAST 995 is changed. This check should be done in dev->set_multicast_list 996 routine. Something sort of: 997 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 998 --ANK 999 */ 1000 if (arp_mc_map(addr, buf, dev, 0) == 0) 1001 dev_mc_add(dev, buf, dev->addr_len, 0); 1002 } 1003 1004 /* 1005 * Remove a filter from a device 1006 */ 1007 1008 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1009 { 1010 char buf[MAX_ADDR_LEN]; 1011 struct net_device *dev = in_dev->dev; 1012 1013 if (arp_mc_map(addr, buf, dev, 0) == 0) 1014 dev_mc_delete(dev, buf, dev->addr_len, 0); 1015 } 1016 1017 #ifdef CONFIG_IP_MULTICAST 1018 /* 1019 * deleted ip_mc_list manipulation 1020 */ 1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1022 { 1023 struct ip_mc_list *pmc; 1024 1025 /* this is an "ip_mc_list" for convenience; only the fields below 1026 * are actually used. In particular, the refcnt and users are not 1027 * used for management of the delete list. Using the same structure 1028 * for deleted items allows change reports to use common code with 1029 * non-deleted or query-response MCA's. 1030 */ 1031 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1032 if (!pmc) 1033 return; 1034 spin_lock_bh(&im->lock); 1035 pmc->interface = im->interface; 1036 in_dev_hold(in_dev); 1037 pmc->multiaddr = im->multiaddr; 1038 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1039 IGMP_Unsolicited_Report_Count; 1040 pmc->sfmode = im->sfmode; 1041 if (pmc->sfmode == MCAST_INCLUDE) { 1042 struct ip_sf_list *psf; 1043 1044 pmc->tomb = im->tomb; 1045 pmc->sources = im->sources; 1046 im->tomb = im->sources = NULL; 1047 for (psf=pmc->sources; psf; psf=psf->sf_next) 1048 psf->sf_crcount = pmc->crcount; 1049 } 1050 spin_unlock_bh(&im->lock); 1051 1052 spin_lock_bh(&in_dev->mc_tomb_lock); 1053 pmc->next = in_dev->mc_tomb; 1054 in_dev->mc_tomb = pmc; 1055 spin_unlock_bh(&in_dev->mc_tomb_lock); 1056 } 1057 1058 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1059 { 1060 struct ip_mc_list *pmc, *pmc_prev; 1061 struct ip_sf_list *psf, *psf_next; 1062 1063 spin_lock_bh(&in_dev->mc_tomb_lock); 1064 pmc_prev = NULL; 1065 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1066 if (pmc->multiaddr == multiaddr) 1067 break; 1068 pmc_prev = pmc; 1069 } 1070 if (pmc) { 1071 if (pmc_prev) 1072 pmc_prev->next = pmc->next; 1073 else 1074 in_dev->mc_tomb = pmc->next; 1075 } 1076 spin_unlock_bh(&in_dev->mc_tomb_lock); 1077 if (pmc) { 1078 for (psf=pmc->tomb; psf; psf=psf_next) { 1079 psf_next = psf->sf_next; 1080 kfree(psf); 1081 } 1082 in_dev_put(pmc->interface); 1083 kfree(pmc); 1084 } 1085 } 1086 1087 static void igmpv3_clear_delrec(struct in_device *in_dev) 1088 { 1089 struct ip_mc_list *pmc, *nextpmc; 1090 1091 spin_lock_bh(&in_dev->mc_tomb_lock); 1092 pmc = in_dev->mc_tomb; 1093 in_dev->mc_tomb = NULL; 1094 spin_unlock_bh(&in_dev->mc_tomb_lock); 1095 1096 for (; pmc; pmc = nextpmc) { 1097 nextpmc = pmc->next; 1098 ip_mc_clear_src(pmc); 1099 in_dev_put(pmc->interface); 1100 kfree(pmc); 1101 } 1102 /* clear dead sources, too */ 1103 read_lock(&in_dev->mc_list_lock); 1104 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1105 struct ip_sf_list *psf, *psf_next; 1106 1107 spin_lock_bh(&pmc->lock); 1108 psf = pmc->tomb; 1109 pmc->tomb = NULL; 1110 spin_unlock_bh(&pmc->lock); 1111 for (; psf; psf=psf_next) { 1112 psf_next = psf->sf_next; 1113 kfree(psf); 1114 } 1115 } 1116 read_unlock(&in_dev->mc_list_lock); 1117 } 1118 #endif 1119 1120 static void igmp_group_dropped(struct ip_mc_list *im) 1121 { 1122 struct in_device *in_dev = im->interface; 1123 #ifdef CONFIG_IP_MULTICAST 1124 int reporter; 1125 #endif 1126 1127 if (im->loaded) { 1128 im->loaded = 0; 1129 ip_mc_filter_del(in_dev, im->multiaddr); 1130 } 1131 1132 #ifdef CONFIG_IP_MULTICAST 1133 if (im->multiaddr == IGMP_ALL_HOSTS) 1134 return; 1135 1136 reporter = im->reporter; 1137 igmp_stop_timer(im); 1138 1139 if (!in_dev->dead) { 1140 if (IGMP_V1_SEEN(in_dev)) 1141 goto done; 1142 if (IGMP_V2_SEEN(in_dev)) { 1143 if (reporter) 1144 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1145 goto done; 1146 } 1147 /* IGMPv3 */ 1148 igmpv3_add_delrec(in_dev, im); 1149 1150 igmp_ifc_event(in_dev); 1151 } 1152 done: 1153 #endif 1154 ip_mc_clear_src(im); 1155 } 1156 1157 static void igmp_group_added(struct ip_mc_list *im) 1158 { 1159 struct in_device *in_dev = im->interface; 1160 1161 if (im->loaded == 0) { 1162 im->loaded = 1; 1163 ip_mc_filter_add(in_dev, im->multiaddr); 1164 } 1165 1166 #ifdef CONFIG_IP_MULTICAST 1167 if (im->multiaddr == IGMP_ALL_HOSTS) 1168 return; 1169 1170 if (in_dev->dead) 1171 return; 1172 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1173 spin_lock_bh(&im->lock); 1174 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1175 spin_unlock_bh(&im->lock); 1176 return; 1177 } 1178 /* else, v3 */ 1179 1180 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1181 IGMP_Unsolicited_Report_Count; 1182 igmp_ifc_event(in_dev); 1183 #endif 1184 } 1185 1186 1187 /* 1188 * Multicast list managers 1189 */ 1190 1191 1192 /* 1193 * A socket has joined a multicast group on device dev. 1194 */ 1195 1196 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1197 { 1198 struct ip_mc_list *im; 1199 1200 ASSERT_RTNL(); 1201 1202 for (im=in_dev->mc_list; im; im=im->next) { 1203 if (im->multiaddr == addr) { 1204 im->users++; 1205 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1206 goto out; 1207 } 1208 } 1209 1210 im = kmalloc(sizeof(*im), GFP_KERNEL); 1211 if (!im) 1212 goto out; 1213 1214 im->users = 1; 1215 im->interface = in_dev; 1216 in_dev_hold(in_dev); 1217 im->multiaddr = addr; 1218 /* initial mode is (EX, empty) */ 1219 im->sfmode = MCAST_EXCLUDE; 1220 im->sfcount[MCAST_INCLUDE] = 0; 1221 im->sfcount[MCAST_EXCLUDE] = 1; 1222 im->sources = NULL; 1223 im->tomb = NULL; 1224 im->crcount = 0; 1225 atomic_set(&im->refcnt, 1); 1226 spin_lock_init(&im->lock); 1227 #ifdef CONFIG_IP_MULTICAST 1228 im->tm_running = 0; 1229 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1230 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1231 im->reporter = 0; 1232 im->gsquery = 0; 1233 #endif 1234 im->loaded = 0; 1235 write_lock_bh(&in_dev->mc_list_lock); 1236 im->next = in_dev->mc_list; 1237 in_dev->mc_list = im; 1238 in_dev->mc_count++; 1239 write_unlock_bh(&in_dev->mc_list_lock); 1240 #ifdef CONFIG_IP_MULTICAST 1241 igmpv3_del_delrec(in_dev, im->multiaddr); 1242 #endif 1243 igmp_group_added(im); 1244 if (!in_dev->dead) 1245 ip_rt_multicast_event(in_dev); 1246 out: 1247 return; 1248 } 1249 1250 /* 1251 * Resend IGMP JOIN report; used for bonding. 1252 */ 1253 void ip_mc_rejoin_group(struct ip_mc_list *im) 1254 { 1255 #ifdef CONFIG_IP_MULTICAST 1256 struct in_device *in_dev = im->interface; 1257 1258 if (im->multiaddr == IGMP_ALL_HOSTS) 1259 return; 1260 1261 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1262 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1263 return; 1264 } 1265 /* else, v3 */ 1266 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1267 IGMP_Unsolicited_Report_Count; 1268 igmp_ifc_event(in_dev); 1269 #endif 1270 } 1271 1272 /* 1273 * A socket has left a multicast group on device dev 1274 */ 1275 1276 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1277 { 1278 struct ip_mc_list *i, **ip; 1279 1280 ASSERT_RTNL(); 1281 1282 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1283 if (i->multiaddr == addr) { 1284 if (--i->users == 0) { 1285 write_lock_bh(&in_dev->mc_list_lock); 1286 *ip = i->next; 1287 in_dev->mc_count--; 1288 write_unlock_bh(&in_dev->mc_list_lock); 1289 igmp_group_dropped(i); 1290 1291 if (!in_dev->dead) 1292 ip_rt_multicast_event(in_dev); 1293 1294 ip_ma_put(i); 1295 return; 1296 } 1297 break; 1298 } 1299 } 1300 } 1301 1302 /* Device changing type */ 1303 1304 void ip_mc_unmap(struct in_device *in_dev) 1305 { 1306 struct ip_mc_list *i; 1307 1308 ASSERT_RTNL(); 1309 1310 for (i = in_dev->mc_list; i; i = i->next) 1311 igmp_group_dropped(i); 1312 } 1313 1314 void ip_mc_remap(struct in_device *in_dev) 1315 { 1316 struct ip_mc_list *i; 1317 1318 ASSERT_RTNL(); 1319 1320 for (i = in_dev->mc_list; i; i = i->next) 1321 igmp_group_added(i); 1322 } 1323 1324 /* Device going down */ 1325 1326 void ip_mc_down(struct in_device *in_dev) 1327 { 1328 struct ip_mc_list *i; 1329 1330 ASSERT_RTNL(); 1331 1332 for (i=in_dev->mc_list; i; i=i->next) 1333 igmp_group_dropped(i); 1334 1335 #ifdef CONFIG_IP_MULTICAST 1336 in_dev->mr_ifc_count = 0; 1337 if (del_timer(&in_dev->mr_ifc_timer)) 1338 __in_dev_put(in_dev); 1339 in_dev->mr_gq_running = 0; 1340 if (del_timer(&in_dev->mr_gq_timer)) 1341 __in_dev_put(in_dev); 1342 igmpv3_clear_delrec(in_dev); 1343 #endif 1344 1345 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1346 } 1347 1348 void ip_mc_init_dev(struct in_device *in_dev) 1349 { 1350 ASSERT_RTNL(); 1351 1352 in_dev->mc_tomb = NULL; 1353 #ifdef CONFIG_IP_MULTICAST 1354 in_dev->mr_gq_running = 0; 1355 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1356 (unsigned long)in_dev); 1357 in_dev->mr_ifc_count = 0; 1358 in_dev->mc_count = 0; 1359 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1360 (unsigned long)in_dev); 1361 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1362 #endif 1363 1364 rwlock_init(&in_dev->mc_list_lock); 1365 spin_lock_init(&in_dev->mc_tomb_lock); 1366 } 1367 1368 /* Device going up */ 1369 1370 void ip_mc_up(struct in_device *in_dev) 1371 { 1372 struct ip_mc_list *i; 1373 1374 ASSERT_RTNL(); 1375 1376 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1377 1378 for (i=in_dev->mc_list; i; i=i->next) 1379 igmp_group_added(i); 1380 } 1381 1382 /* 1383 * Device is about to be destroyed: clean up. 1384 */ 1385 1386 void ip_mc_destroy_dev(struct in_device *in_dev) 1387 { 1388 struct ip_mc_list *i; 1389 1390 ASSERT_RTNL(); 1391 1392 /* Deactivate timers */ 1393 ip_mc_down(in_dev); 1394 1395 write_lock_bh(&in_dev->mc_list_lock); 1396 while ((i = in_dev->mc_list) != NULL) { 1397 in_dev->mc_list = i->next; 1398 in_dev->mc_count--; 1399 write_unlock_bh(&in_dev->mc_list_lock); 1400 igmp_group_dropped(i); 1401 ip_ma_put(i); 1402 1403 write_lock_bh(&in_dev->mc_list_lock); 1404 } 1405 write_unlock_bh(&in_dev->mc_list_lock); 1406 } 1407 1408 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1409 { 1410 struct flowi fl = { .nl_u = { .ip4_u = 1411 { .daddr = imr->imr_multiaddr.s_addr } } }; 1412 struct rtable *rt; 1413 struct net_device *dev = NULL; 1414 struct in_device *idev = NULL; 1415 1416 if (imr->imr_ifindex) { 1417 idev = inetdev_by_index(net, imr->imr_ifindex); 1418 if (idev) 1419 __in_dev_put(idev); 1420 return idev; 1421 } 1422 if (imr->imr_address.s_addr) { 1423 dev = ip_dev_find(net, imr->imr_address.s_addr); 1424 if (!dev) 1425 return NULL; 1426 dev_put(dev); 1427 } 1428 1429 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1430 dev = rt->u.dst.dev; 1431 ip_rt_put(rt); 1432 } 1433 if (dev) { 1434 imr->imr_ifindex = dev->ifindex; 1435 idev = __in_dev_get_rtnl(dev); 1436 } 1437 return idev; 1438 } 1439 1440 /* 1441 * Join a socket to a group 1442 */ 1443 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1444 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1445 1446 1447 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1448 __be32 *psfsrc) 1449 { 1450 struct ip_sf_list *psf, *psf_prev; 1451 int rv = 0; 1452 1453 psf_prev = NULL; 1454 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1455 if (psf->sf_inaddr == *psfsrc) 1456 break; 1457 psf_prev = psf; 1458 } 1459 if (!psf || psf->sf_count[sfmode] == 0) { 1460 /* source filter not found, or count wrong => bug */ 1461 return -ESRCH; 1462 } 1463 psf->sf_count[sfmode]--; 1464 if (psf->sf_count[sfmode] == 0) { 1465 ip_rt_multicast_event(pmc->interface); 1466 } 1467 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1468 #ifdef CONFIG_IP_MULTICAST 1469 struct in_device *in_dev = pmc->interface; 1470 #endif 1471 1472 /* no more filters for this source */ 1473 if (psf_prev) 1474 psf_prev->sf_next = psf->sf_next; 1475 else 1476 pmc->sources = psf->sf_next; 1477 #ifdef CONFIG_IP_MULTICAST 1478 if (psf->sf_oldin && 1479 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1480 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1481 IGMP_Unsolicited_Report_Count; 1482 psf->sf_next = pmc->tomb; 1483 pmc->tomb = psf; 1484 rv = 1; 1485 } else 1486 #endif 1487 kfree(psf); 1488 } 1489 return rv; 1490 } 1491 1492 #ifndef CONFIG_IP_MULTICAST 1493 #define igmp_ifc_event(x) do { } while (0) 1494 #endif 1495 1496 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1497 int sfcount, __be32 *psfsrc, int delta) 1498 { 1499 struct ip_mc_list *pmc; 1500 int changerec = 0; 1501 int i, err; 1502 1503 if (!in_dev) 1504 return -ENODEV; 1505 read_lock(&in_dev->mc_list_lock); 1506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1507 if (*pmca == pmc->multiaddr) 1508 break; 1509 } 1510 if (!pmc) { 1511 /* MCA not found?? bug */ 1512 read_unlock(&in_dev->mc_list_lock); 1513 return -ESRCH; 1514 } 1515 spin_lock_bh(&pmc->lock); 1516 read_unlock(&in_dev->mc_list_lock); 1517 #ifdef CONFIG_IP_MULTICAST 1518 sf_markstate(pmc); 1519 #endif 1520 if (!delta) { 1521 err = -EINVAL; 1522 if (!pmc->sfcount[sfmode]) 1523 goto out_unlock; 1524 pmc->sfcount[sfmode]--; 1525 } 1526 err = 0; 1527 for (i=0; i<sfcount; i++) { 1528 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1529 1530 changerec |= rv > 0; 1531 if (!err && rv < 0) 1532 err = rv; 1533 } 1534 if (pmc->sfmode == MCAST_EXCLUDE && 1535 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1536 pmc->sfcount[MCAST_INCLUDE]) { 1537 #ifdef CONFIG_IP_MULTICAST 1538 struct ip_sf_list *psf; 1539 #endif 1540 1541 /* filter mode change */ 1542 pmc->sfmode = MCAST_INCLUDE; 1543 #ifdef CONFIG_IP_MULTICAST 1544 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1545 IGMP_Unsolicited_Report_Count; 1546 in_dev->mr_ifc_count = pmc->crcount; 1547 for (psf=pmc->sources; psf; psf = psf->sf_next) 1548 psf->sf_crcount = 0; 1549 igmp_ifc_event(pmc->interface); 1550 } else if (sf_setstate(pmc) || changerec) { 1551 igmp_ifc_event(pmc->interface); 1552 #endif 1553 } 1554 out_unlock: 1555 spin_unlock_bh(&pmc->lock); 1556 return err; 1557 } 1558 1559 /* 1560 * Add multicast single-source filter to the interface list 1561 */ 1562 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1563 __be32 *psfsrc, int delta) 1564 { 1565 struct ip_sf_list *psf, *psf_prev; 1566 1567 psf_prev = NULL; 1568 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1569 if (psf->sf_inaddr == *psfsrc) 1570 break; 1571 psf_prev = psf; 1572 } 1573 if (!psf) { 1574 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1575 if (!psf) 1576 return -ENOBUFS; 1577 psf->sf_inaddr = *psfsrc; 1578 if (psf_prev) { 1579 psf_prev->sf_next = psf; 1580 } else 1581 pmc->sources = psf; 1582 } 1583 psf->sf_count[sfmode]++; 1584 if (psf->sf_count[sfmode] == 1) { 1585 ip_rt_multicast_event(pmc->interface); 1586 } 1587 return 0; 1588 } 1589 1590 #ifdef CONFIG_IP_MULTICAST 1591 static void sf_markstate(struct ip_mc_list *pmc) 1592 { 1593 struct ip_sf_list *psf; 1594 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1595 1596 for (psf=pmc->sources; psf; psf=psf->sf_next) 1597 if (pmc->sfcount[MCAST_EXCLUDE]) { 1598 psf->sf_oldin = mca_xcount == 1599 psf->sf_count[MCAST_EXCLUDE] && 1600 !psf->sf_count[MCAST_INCLUDE]; 1601 } else 1602 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1603 } 1604 1605 static int sf_setstate(struct ip_mc_list *pmc) 1606 { 1607 struct ip_sf_list *psf, *dpsf; 1608 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1609 int qrv = pmc->interface->mr_qrv; 1610 int new_in, rv; 1611 1612 rv = 0; 1613 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1614 if (pmc->sfcount[MCAST_EXCLUDE]) { 1615 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1616 !psf->sf_count[MCAST_INCLUDE]; 1617 } else 1618 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1619 if (new_in) { 1620 if (!psf->sf_oldin) { 1621 struct ip_sf_list *prev = NULL; 1622 1623 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1624 if (dpsf->sf_inaddr == psf->sf_inaddr) 1625 break; 1626 prev = dpsf; 1627 } 1628 if (dpsf) { 1629 if (prev) 1630 prev->sf_next = dpsf->sf_next; 1631 else 1632 pmc->tomb = dpsf->sf_next; 1633 kfree(dpsf); 1634 } 1635 psf->sf_crcount = qrv; 1636 rv++; 1637 } 1638 } else if (psf->sf_oldin) { 1639 1640 psf->sf_crcount = 0; 1641 /* 1642 * add or update "delete" records if an active filter 1643 * is now inactive 1644 */ 1645 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1646 if (dpsf->sf_inaddr == psf->sf_inaddr) 1647 break; 1648 if (!dpsf) { 1649 dpsf = (struct ip_sf_list *) 1650 kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1651 if (!dpsf) 1652 continue; 1653 *dpsf = *psf; 1654 /* pmc->lock held by callers */ 1655 dpsf->sf_next = pmc->tomb; 1656 pmc->tomb = dpsf; 1657 } 1658 dpsf->sf_crcount = qrv; 1659 rv++; 1660 } 1661 } 1662 return rv; 1663 } 1664 #endif 1665 1666 /* 1667 * Add multicast source filter list to the interface list 1668 */ 1669 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1670 int sfcount, __be32 *psfsrc, int delta) 1671 { 1672 struct ip_mc_list *pmc; 1673 int isexclude; 1674 int i, err; 1675 1676 if (!in_dev) 1677 return -ENODEV; 1678 read_lock(&in_dev->mc_list_lock); 1679 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1680 if (*pmca == pmc->multiaddr) 1681 break; 1682 } 1683 if (!pmc) { 1684 /* MCA not found?? bug */ 1685 read_unlock(&in_dev->mc_list_lock); 1686 return -ESRCH; 1687 } 1688 spin_lock_bh(&pmc->lock); 1689 read_unlock(&in_dev->mc_list_lock); 1690 1691 #ifdef CONFIG_IP_MULTICAST 1692 sf_markstate(pmc); 1693 #endif 1694 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1695 if (!delta) 1696 pmc->sfcount[sfmode]++; 1697 err = 0; 1698 for (i=0; i<sfcount; i++) { 1699 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1700 if (err) 1701 break; 1702 } 1703 if (err) { 1704 int j; 1705 1706 pmc->sfcount[sfmode]--; 1707 for (j=0; j<i; j++) 1708 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1709 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1710 #ifdef CONFIG_IP_MULTICAST 1711 struct ip_sf_list *psf; 1712 in_dev = pmc->interface; 1713 #endif 1714 1715 /* filter mode change */ 1716 if (pmc->sfcount[MCAST_EXCLUDE]) 1717 pmc->sfmode = MCAST_EXCLUDE; 1718 else if (pmc->sfcount[MCAST_INCLUDE]) 1719 pmc->sfmode = MCAST_INCLUDE; 1720 #ifdef CONFIG_IP_MULTICAST 1721 /* else no filters; keep old mode for reports */ 1722 1723 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1724 IGMP_Unsolicited_Report_Count; 1725 in_dev->mr_ifc_count = pmc->crcount; 1726 for (psf=pmc->sources; psf; psf = psf->sf_next) 1727 psf->sf_crcount = 0; 1728 igmp_ifc_event(in_dev); 1729 } else if (sf_setstate(pmc)) { 1730 igmp_ifc_event(in_dev); 1731 #endif 1732 } 1733 spin_unlock_bh(&pmc->lock); 1734 return err; 1735 } 1736 1737 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1738 { 1739 struct ip_sf_list *psf, *nextpsf; 1740 1741 for (psf=pmc->tomb; psf; psf=nextpsf) { 1742 nextpsf = psf->sf_next; 1743 kfree(psf); 1744 } 1745 pmc->tomb = NULL; 1746 for (psf=pmc->sources; psf; psf=nextpsf) { 1747 nextpsf = psf->sf_next; 1748 kfree(psf); 1749 } 1750 pmc->sources = NULL; 1751 pmc->sfmode = MCAST_EXCLUDE; 1752 pmc->sfcount[MCAST_INCLUDE] = 0; 1753 pmc->sfcount[MCAST_EXCLUDE] = 1; 1754 } 1755 1756 1757 /* 1758 * Join a multicast group 1759 */ 1760 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1761 { 1762 int err; 1763 __be32 addr = imr->imr_multiaddr.s_addr; 1764 struct ip_mc_socklist *iml = NULL, *i; 1765 struct in_device *in_dev; 1766 struct inet_sock *inet = inet_sk(sk); 1767 struct net *net = sock_net(sk); 1768 int ifindex; 1769 int count = 0; 1770 1771 if (!ipv4_is_multicast(addr)) 1772 return -EINVAL; 1773 1774 rtnl_lock(); 1775 1776 in_dev = ip_mc_find_dev(net, imr); 1777 1778 if (!in_dev) { 1779 iml = NULL; 1780 err = -ENODEV; 1781 goto done; 1782 } 1783 1784 err = -EADDRINUSE; 1785 ifindex = imr->imr_ifindex; 1786 for (i = inet->mc_list; i; i = i->next) { 1787 if (i->multi.imr_multiaddr.s_addr == addr && 1788 i->multi.imr_ifindex == ifindex) 1789 goto done; 1790 count++; 1791 } 1792 err = -ENOBUFS; 1793 if (count >= sysctl_igmp_max_memberships) 1794 goto done; 1795 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1796 if (iml == NULL) 1797 goto done; 1798 1799 memcpy(&iml->multi, imr, sizeof(*imr)); 1800 iml->next = inet->mc_list; 1801 iml->sflist = NULL; 1802 iml->sfmode = MCAST_EXCLUDE; 1803 rcu_assign_pointer(inet->mc_list, iml); 1804 ip_mc_inc_group(in_dev, addr); 1805 err = 0; 1806 done: 1807 rtnl_unlock(); 1808 return err; 1809 } 1810 1811 static void ip_sf_socklist_reclaim(struct rcu_head *rp) 1812 { 1813 struct ip_sf_socklist *psf; 1814 1815 psf = container_of(rp, struct ip_sf_socklist, rcu); 1816 /* sk_omem_alloc should have been decreased by the caller*/ 1817 kfree(psf); 1818 } 1819 1820 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1821 struct in_device *in_dev) 1822 { 1823 struct ip_sf_socklist *psf = iml->sflist; 1824 int err; 1825 1826 if (psf == NULL) { 1827 /* any-source empty exclude case */ 1828 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1829 iml->sfmode, 0, NULL, 0); 1830 } 1831 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1832 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1833 rcu_assign_pointer(iml->sflist, NULL); 1834 /* decrease mem now to avoid the memleak warning */ 1835 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1836 call_rcu(&psf->rcu, ip_sf_socklist_reclaim); 1837 return err; 1838 } 1839 1840 1841 static void ip_mc_socklist_reclaim(struct rcu_head *rp) 1842 { 1843 struct ip_mc_socklist *iml; 1844 1845 iml = container_of(rp, struct ip_mc_socklist, rcu); 1846 /* sk_omem_alloc should have been decreased by the caller*/ 1847 kfree(iml); 1848 } 1849 1850 1851 /* 1852 * Ask a socket to leave a group. 1853 */ 1854 1855 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1856 { 1857 struct inet_sock *inet = inet_sk(sk); 1858 struct ip_mc_socklist *iml, **imlp; 1859 struct in_device *in_dev; 1860 struct net *net = sock_net(sk); 1861 __be32 group = imr->imr_multiaddr.s_addr; 1862 u32 ifindex; 1863 int ret = -EADDRNOTAVAIL; 1864 1865 rtnl_lock(); 1866 in_dev = ip_mc_find_dev(net, imr); 1867 ifindex = imr->imr_ifindex; 1868 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1869 if (iml->multi.imr_multiaddr.s_addr != group) 1870 continue; 1871 if (ifindex) { 1872 if (iml->multi.imr_ifindex != ifindex) 1873 continue; 1874 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1875 iml->multi.imr_address.s_addr) 1876 continue; 1877 1878 (void) ip_mc_leave_src(sk, iml, in_dev); 1879 1880 rcu_assign_pointer(*imlp, iml->next); 1881 1882 if (in_dev) 1883 ip_mc_dec_group(in_dev, group); 1884 rtnl_unlock(); 1885 /* decrease mem now to avoid the memleak warning */ 1886 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1887 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 1888 return 0; 1889 } 1890 if (!in_dev) 1891 ret = -ENODEV; 1892 rtnl_unlock(); 1893 return ret; 1894 } 1895 1896 int ip_mc_source(int add, int omode, struct sock *sk, struct 1897 ip_mreq_source *mreqs, int ifindex) 1898 { 1899 int err; 1900 struct ip_mreqn imr; 1901 __be32 addr = mreqs->imr_multiaddr; 1902 struct ip_mc_socklist *pmc; 1903 struct in_device *in_dev = NULL; 1904 struct inet_sock *inet = inet_sk(sk); 1905 struct ip_sf_socklist *psl; 1906 struct net *net = sock_net(sk); 1907 int leavegroup = 0; 1908 int i, j, rv; 1909 1910 if (!ipv4_is_multicast(addr)) 1911 return -EINVAL; 1912 1913 rtnl_lock(); 1914 1915 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1916 imr.imr_address.s_addr = mreqs->imr_interface; 1917 imr.imr_ifindex = ifindex; 1918 in_dev = ip_mc_find_dev(net, &imr); 1919 1920 if (!in_dev) { 1921 err = -ENODEV; 1922 goto done; 1923 } 1924 err = -EADDRNOTAVAIL; 1925 1926 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1927 if ((pmc->multi.imr_multiaddr.s_addr == 1928 imr.imr_multiaddr.s_addr) && 1929 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1930 break; 1931 } 1932 if (!pmc) { /* must have a prior join */ 1933 err = -EINVAL; 1934 goto done; 1935 } 1936 /* if a source filter was set, must be the same mode as before */ 1937 if (pmc->sflist) { 1938 if (pmc->sfmode != omode) { 1939 err = -EINVAL; 1940 goto done; 1941 } 1942 } else if (pmc->sfmode != omode) { 1943 /* allow mode switches for empty-set filters */ 1944 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1945 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1946 NULL, 0); 1947 pmc->sfmode = omode; 1948 } 1949 1950 psl = pmc->sflist; 1951 if (!add) { 1952 if (!psl) 1953 goto done; /* err = -EADDRNOTAVAIL */ 1954 rv = !0; 1955 for (i=0; i<psl->sl_count; i++) { 1956 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1957 sizeof(__be32)); 1958 if (rv == 0) 1959 break; 1960 } 1961 if (rv) /* source not found */ 1962 goto done; /* err = -EADDRNOTAVAIL */ 1963 1964 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1965 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1966 leavegroup = 1; 1967 goto done; 1968 } 1969 1970 /* update the interface filter */ 1971 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1972 &mreqs->imr_sourceaddr, 1); 1973 1974 for (j=i+1; j<psl->sl_count; j++) 1975 psl->sl_addr[j-1] = psl->sl_addr[j]; 1976 psl->sl_count--; 1977 err = 0; 1978 goto done; 1979 } 1980 /* else, add a new source to the filter */ 1981 1982 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1983 err = -ENOBUFS; 1984 goto done; 1985 } 1986 if (!psl || psl->sl_count == psl->sl_max) { 1987 struct ip_sf_socklist *newpsl; 1988 int count = IP_SFBLOCK; 1989 1990 if (psl) 1991 count += psl->sl_max; 1992 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1993 if (!newpsl) { 1994 err = -ENOBUFS; 1995 goto done; 1996 } 1997 newpsl->sl_max = count; 1998 newpsl->sl_count = count - IP_SFBLOCK; 1999 if (psl) { 2000 for (i=0; i<psl->sl_count; i++) 2001 newpsl->sl_addr[i] = psl->sl_addr[i]; 2002 /* decrease mem now to avoid the memleak warning */ 2003 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2004 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2005 } 2006 rcu_assign_pointer(pmc->sflist, newpsl); 2007 psl = newpsl; 2008 } 2009 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2010 for (i=0; i<psl->sl_count; i++) { 2011 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2012 sizeof(__be32)); 2013 if (rv == 0) 2014 break; 2015 } 2016 if (rv == 0) /* address already there is an error */ 2017 goto done; 2018 for (j=psl->sl_count-1; j>=i; j--) 2019 psl->sl_addr[j+1] = psl->sl_addr[j]; 2020 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2021 psl->sl_count++; 2022 err = 0; 2023 /* update the interface list */ 2024 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2025 &mreqs->imr_sourceaddr, 1); 2026 done: 2027 rtnl_unlock(); 2028 if (leavegroup) 2029 return ip_mc_leave_group(sk, &imr); 2030 return err; 2031 } 2032 2033 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2034 { 2035 int err = 0; 2036 struct ip_mreqn imr; 2037 __be32 addr = msf->imsf_multiaddr; 2038 struct ip_mc_socklist *pmc; 2039 struct in_device *in_dev; 2040 struct inet_sock *inet = inet_sk(sk); 2041 struct ip_sf_socklist *newpsl, *psl; 2042 struct net *net = sock_net(sk); 2043 int leavegroup = 0; 2044 2045 if (!ipv4_is_multicast(addr)) 2046 return -EINVAL; 2047 if (msf->imsf_fmode != MCAST_INCLUDE && 2048 msf->imsf_fmode != MCAST_EXCLUDE) 2049 return -EINVAL; 2050 2051 rtnl_lock(); 2052 2053 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2054 imr.imr_address.s_addr = msf->imsf_interface; 2055 imr.imr_ifindex = ifindex; 2056 in_dev = ip_mc_find_dev(net, &imr); 2057 2058 if (!in_dev) { 2059 err = -ENODEV; 2060 goto done; 2061 } 2062 2063 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2064 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2065 leavegroup = 1; 2066 goto done; 2067 } 2068 2069 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2070 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2071 pmc->multi.imr_ifindex == imr.imr_ifindex) 2072 break; 2073 } 2074 if (!pmc) { /* must have a prior join */ 2075 err = -EINVAL; 2076 goto done; 2077 } 2078 if (msf->imsf_numsrc) { 2079 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2080 GFP_KERNEL); 2081 if (!newpsl) { 2082 err = -ENOBUFS; 2083 goto done; 2084 } 2085 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2086 memcpy(newpsl->sl_addr, msf->imsf_slist, 2087 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2088 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2089 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2090 if (err) { 2091 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2092 goto done; 2093 } 2094 } else { 2095 newpsl = NULL; 2096 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2097 msf->imsf_fmode, 0, NULL, 0); 2098 } 2099 psl = pmc->sflist; 2100 if (psl) { 2101 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2102 psl->sl_count, psl->sl_addr, 0); 2103 /* decrease mem now to avoid the memleak warning */ 2104 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2105 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2106 } else 2107 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2108 0, NULL, 0); 2109 rcu_assign_pointer(pmc->sflist, newpsl); 2110 pmc->sfmode = msf->imsf_fmode; 2111 err = 0; 2112 done: 2113 rtnl_unlock(); 2114 if (leavegroup) 2115 err = ip_mc_leave_group(sk, &imr); 2116 return err; 2117 } 2118 2119 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2120 struct ip_msfilter __user *optval, int __user *optlen) 2121 { 2122 int err, len, count, copycount; 2123 struct ip_mreqn imr; 2124 __be32 addr = msf->imsf_multiaddr; 2125 struct ip_mc_socklist *pmc; 2126 struct in_device *in_dev; 2127 struct inet_sock *inet = inet_sk(sk); 2128 struct ip_sf_socklist *psl; 2129 struct net *net = sock_net(sk); 2130 2131 if (!ipv4_is_multicast(addr)) 2132 return -EINVAL; 2133 2134 rtnl_lock(); 2135 2136 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2137 imr.imr_address.s_addr = msf->imsf_interface; 2138 imr.imr_ifindex = 0; 2139 in_dev = ip_mc_find_dev(net, &imr); 2140 2141 if (!in_dev) { 2142 err = -ENODEV; 2143 goto done; 2144 } 2145 err = -EADDRNOTAVAIL; 2146 2147 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2148 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2149 pmc->multi.imr_ifindex == imr.imr_ifindex) 2150 break; 2151 } 2152 if (!pmc) /* must have a prior join */ 2153 goto done; 2154 msf->imsf_fmode = pmc->sfmode; 2155 psl = pmc->sflist; 2156 rtnl_unlock(); 2157 if (!psl) { 2158 len = 0; 2159 count = 0; 2160 } else { 2161 count = psl->sl_count; 2162 } 2163 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2164 len = copycount * sizeof(psl->sl_addr[0]); 2165 msf->imsf_numsrc = count; 2166 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2167 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2168 return -EFAULT; 2169 } 2170 if (len && 2171 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2172 return -EFAULT; 2173 return 0; 2174 done: 2175 rtnl_unlock(); 2176 return err; 2177 } 2178 2179 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2180 struct group_filter __user *optval, int __user *optlen) 2181 { 2182 int err, i, count, copycount; 2183 struct sockaddr_in *psin; 2184 __be32 addr; 2185 struct ip_mc_socklist *pmc; 2186 struct inet_sock *inet = inet_sk(sk); 2187 struct ip_sf_socklist *psl; 2188 2189 psin = (struct sockaddr_in *)&gsf->gf_group; 2190 if (psin->sin_family != AF_INET) 2191 return -EINVAL; 2192 addr = psin->sin_addr.s_addr; 2193 if (!ipv4_is_multicast(addr)) 2194 return -EINVAL; 2195 2196 rtnl_lock(); 2197 2198 err = -EADDRNOTAVAIL; 2199 2200 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2201 if (pmc->multi.imr_multiaddr.s_addr == addr && 2202 pmc->multi.imr_ifindex == gsf->gf_interface) 2203 break; 2204 } 2205 if (!pmc) /* must have a prior join */ 2206 goto done; 2207 gsf->gf_fmode = pmc->sfmode; 2208 psl = pmc->sflist; 2209 rtnl_unlock(); 2210 count = psl ? psl->sl_count : 0; 2211 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2212 gsf->gf_numsrc = count; 2213 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2214 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2215 return -EFAULT; 2216 } 2217 for (i=0; i<copycount; i++) { 2218 struct sockaddr_storage ss; 2219 2220 psin = (struct sockaddr_in *)&ss; 2221 memset(&ss, 0, sizeof(ss)); 2222 psin->sin_family = AF_INET; 2223 psin->sin_addr.s_addr = psl->sl_addr[i]; 2224 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2225 return -EFAULT; 2226 } 2227 return 0; 2228 done: 2229 rtnl_unlock(); 2230 return err; 2231 } 2232 2233 /* 2234 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2235 */ 2236 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2237 { 2238 struct inet_sock *inet = inet_sk(sk); 2239 struct ip_mc_socklist *pmc; 2240 struct ip_sf_socklist *psl; 2241 int i; 2242 int ret; 2243 2244 ret = 1; 2245 if (!ipv4_is_multicast(loc_addr)) 2246 goto out; 2247 2248 rcu_read_lock(); 2249 for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) { 2250 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2251 pmc->multi.imr_ifindex == dif) 2252 break; 2253 } 2254 ret = inet->mc_all; 2255 if (!pmc) 2256 goto unlock; 2257 psl = pmc->sflist; 2258 ret = (pmc->sfmode == MCAST_EXCLUDE); 2259 if (!psl) 2260 goto unlock; 2261 2262 for (i=0; i<psl->sl_count; i++) { 2263 if (psl->sl_addr[i] == rmt_addr) 2264 break; 2265 } 2266 ret = 0; 2267 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2268 goto unlock; 2269 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2270 goto unlock; 2271 ret = 1; 2272 unlock: 2273 rcu_read_unlock(); 2274 out: 2275 return ret; 2276 } 2277 2278 /* 2279 * A socket is closing. 2280 */ 2281 2282 void ip_mc_drop_socket(struct sock *sk) 2283 { 2284 struct inet_sock *inet = inet_sk(sk); 2285 struct ip_mc_socklist *iml; 2286 struct net *net = sock_net(sk); 2287 2288 if (inet->mc_list == NULL) 2289 return; 2290 2291 rtnl_lock(); 2292 while ((iml = inet->mc_list) != NULL) { 2293 struct in_device *in_dev; 2294 rcu_assign_pointer(inet->mc_list, iml->next); 2295 2296 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2297 (void) ip_mc_leave_src(sk, iml, in_dev); 2298 if (in_dev != NULL) { 2299 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2300 in_dev_put(in_dev); 2301 } 2302 /* decrease mem now to avoid the memleak warning */ 2303 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2304 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 2305 } 2306 rtnl_unlock(); 2307 } 2308 2309 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2310 { 2311 struct ip_mc_list *im; 2312 struct ip_sf_list *psf; 2313 int rv = 0; 2314 2315 read_lock(&in_dev->mc_list_lock); 2316 for (im=in_dev->mc_list; im; im=im->next) { 2317 if (im->multiaddr == mc_addr) 2318 break; 2319 } 2320 if (im && proto == IPPROTO_IGMP) { 2321 rv = 1; 2322 } else if (im) { 2323 if (src_addr) { 2324 for (psf=im->sources; psf; psf=psf->sf_next) { 2325 if (psf->sf_inaddr == src_addr) 2326 break; 2327 } 2328 if (psf) 2329 rv = psf->sf_count[MCAST_INCLUDE] || 2330 psf->sf_count[MCAST_EXCLUDE] != 2331 im->sfcount[MCAST_EXCLUDE]; 2332 else 2333 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2334 } else 2335 rv = 1; /* unspecified source; tentatively allow */ 2336 } 2337 read_unlock(&in_dev->mc_list_lock); 2338 return rv; 2339 } 2340 2341 #if defined(CONFIG_PROC_FS) 2342 struct igmp_mc_iter_state { 2343 struct seq_net_private p; 2344 struct net_device *dev; 2345 struct in_device *in_dev; 2346 }; 2347 2348 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2349 2350 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2351 { 2352 struct net *net = seq_file_net(seq); 2353 struct ip_mc_list *im = NULL; 2354 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2355 2356 state->in_dev = NULL; 2357 for_each_netdev_rcu(net, state->dev) { 2358 struct in_device *in_dev; 2359 2360 in_dev = __in_dev_get_rcu(state->dev); 2361 if (!in_dev) 2362 continue; 2363 read_lock(&in_dev->mc_list_lock); 2364 im = in_dev->mc_list; 2365 if (im) { 2366 state->in_dev = in_dev; 2367 break; 2368 } 2369 read_unlock(&in_dev->mc_list_lock); 2370 } 2371 return im; 2372 } 2373 2374 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2375 { 2376 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2377 im = im->next; 2378 while (!im) { 2379 if (likely(state->in_dev != NULL)) 2380 read_unlock(&state->in_dev->mc_list_lock); 2381 2382 state->dev = next_net_device_rcu(state->dev); 2383 if (!state->dev) { 2384 state->in_dev = NULL; 2385 break; 2386 } 2387 state->in_dev = __in_dev_get_rcu(state->dev); 2388 if (!state->in_dev) 2389 continue; 2390 read_lock(&state->in_dev->mc_list_lock); 2391 im = state->in_dev->mc_list; 2392 } 2393 return im; 2394 } 2395 2396 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2397 { 2398 struct ip_mc_list *im = igmp_mc_get_first(seq); 2399 if (im) 2400 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2401 --pos; 2402 return pos ? NULL : im; 2403 } 2404 2405 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2406 __acquires(rcu) 2407 { 2408 rcu_read_lock(); 2409 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2410 } 2411 2412 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2413 { 2414 struct ip_mc_list *im; 2415 if (v == SEQ_START_TOKEN) 2416 im = igmp_mc_get_first(seq); 2417 else 2418 im = igmp_mc_get_next(seq, v); 2419 ++*pos; 2420 return im; 2421 } 2422 2423 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2424 __releases(rcu) 2425 { 2426 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2427 if (likely(state->in_dev != NULL)) { 2428 read_unlock(&state->in_dev->mc_list_lock); 2429 state->in_dev = NULL; 2430 } 2431 state->dev = NULL; 2432 rcu_read_unlock(); 2433 } 2434 2435 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2436 { 2437 if (v == SEQ_START_TOKEN) 2438 seq_puts(seq, 2439 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2440 else { 2441 struct ip_mc_list *im = (struct ip_mc_list *)v; 2442 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2443 char *querier; 2444 #ifdef CONFIG_IP_MULTICAST 2445 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2446 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2447 "V3"; 2448 #else 2449 querier = "NONE"; 2450 #endif 2451 2452 if (state->in_dev->mc_list == im) { 2453 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2454 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2455 } 2456 2457 seq_printf(seq, 2458 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2459 im->multiaddr, im->users, 2460 im->tm_running, im->tm_running ? 2461 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2462 im->reporter); 2463 } 2464 return 0; 2465 } 2466 2467 static const struct seq_operations igmp_mc_seq_ops = { 2468 .start = igmp_mc_seq_start, 2469 .next = igmp_mc_seq_next, 2470 .stop = igmp_mc_seq_stop, 2471 .show = igmp_mc_seq_show, 2472 }; 2473 2474 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2475 { 2476 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2477 sizeof(struct igmp_mc_iter_state)); 2478 } 2479 2480 static const struct file_operations igmp_mc_seq_fops = { 2481 .owner = THIS_MODULE, 2482 .open = igmp_mc_seq_open, 2483 .read = seq_read, 2484 .llseek = seq_lseek, 2485 .release = seq_release_net, 2486 }; 2487 2488 struct igmp_mcf_iter_state { 2489 struct seq_net_private p; 2490 struct net_device *dev; 2491 struct in_device *idev; 2492 struct ip_mc_list *im; 2493 }; 2494 2495 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2496 2497 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2498 { 2499 struct net *net = seq_file_net(seq); 2500 struct ip_sf_list *psf = NULL; 2501 struct ip_mc_list *im = NULL; 2502 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2503 2504 state->idev = NULL; 2505 state->im = NULL; 2506 for_each_netdev_rcu(net, state->dev) { 2507 struct in_device *idev; 2508 idev = __in_dev_get_rcu(state->dev); 2509 if (unlikely(idev == NULL)) 2510 continue; 2511 read_lock(&idev->mc_list_lock); 2512 im = idev->mc_list; 2513 if (likely(im != NULL)) { 2514 spin_lock_bh(&im->lock); 2515 psf = im->sources; 2516 if (likely(psf != NULL)) { 2517 state->im = im; 2518 state->idev = idev; 2519 break; 2520 } 2521 spin_unlock_bh(&im->lock); 2522 } 2523 read_unlock(&idev->mc_list_lock); 2524 } 2525 return psf; 2526 } 2527 2528 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2529 { 2530 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2531 2532 psf = psf->sf_next; 2533 while (!psf) { 2534 spin_unlock_bh(&state->im->lock); 2535 state->im = state->im->next; 2536 while (!state->im) { 2537 if (likely(state->idev != NULL)) 2538 read_unlock(&state->idev->mc_list_lock); 2539 2540 state->dev = next_net_device_rcu(state->dev); 2541 if (!state->dev) { 2542 state->idev = NULL; 2543 goto out; 2544 } 2545 state->idev = __in_dev_get_rcu(state->dev); 2546 if (!state->idev) 2547 continue; 2548 read_lock(&state->idev->mc_list_lock); 2549 state->im = state->idev->mc_list; 2550 } 2551 if (!state->im) 2552 break; 2553 spin_lock_bh(&state->im->lock); 2554 psf = state->im->sources; 2555 } 2556 out: 2557 return psf; 2558 } 2559 2560 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2561 { 2562 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2563 if (psf) 2564 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2565 --pos; 2566 return pos ? NULL : psf; 2567 } 2568 2569 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2570 __acquires(rcu) 2571 { 2572 rcu_read_lock(); 2573 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2574 } 2575 2576 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2577 { 2578 struct ip_sf_list *psf; 2579 if (v == SEQ_START_TOKEN) 2580 psf = igmp_mcf_get_first(seq); 2581 else 2582 psf = igmp_mcf_get_next(seq, v); 2583 ++*pos; 2584 return psf; 2585 } 2586 2587 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2588 __releases(rcu) 2589 { 2590 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2591 if (likely(state->im != NULL)) { 2592 spin_unlock_bh(&state->im->lock); 2593 state->im = NULL; 2594 } 2595 if (likely(state->idev != NULL)) { 2596 read_unlock(&state->idev->mc_list_lock); 2597 state->idev = NULL; 2598 } 2599 state->dev = NULL; 2600 rcu_read_unlock(); 2601 } 2602 2603 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2604 { 2605 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2606 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2607 2608 if (v == SEQ_START_TOKEN) { 2609 seq_printf(seq, 2610 "%3s %6s " 2611 "%10s %10s %6s %6s\n", "Idx", 2612 "Device", "MCA", 2613 "SRC", "INC", "EXC"); 2614 } else { 2615 seq_printf(seq, 2616 "%3d %6.6s 0x%08x " 2617 "0x%08x %6lu %6lu\n", 2618 state->dev->ifindex, state->dev->name, 2619 ntohl(state->im->multiaddr), 2620 ntohl(psf->sf_inaddr), 2621 psf->sf_count[MCAST_INCLUDE], 2622 psf->sf_count[MCAST_EXCLUDE]); 2623 } 2624 return 0; 2625 } 2626 2627 static const struct seq_operations igmp_mcf_seq_ops = { 2628 .start = igmp_mcf_seq_start, 2629 .next = igmp_mcf_seq_next, 2630 .stop = igmp_mcf_seq_stop, 2631 .show = igmp_mcf_seq_show, 2632 }; 2633 2634 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2635 { 2636 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2637 sizeof(struct igmp_mcf_iter_state)); 2638 } 2639 2640 static const struct file_operations igmp_mcf_seq_fops = { 2641 .owner = THIS_MODULE, 2642 .open = igmp_mcf_seq_open, 2643 .read = seq_read, 2644 .llseek = seq_lseek, 2645 .release = seq_release_net, 2646 }; 2647 2648 static int __net_init igmp_net_init(struct net *net) 2649 { 2650 struct proc_dir_entry *pde; 2651 2652 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2653 if (!pde) 2654 goto out_igmp; 2655 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2656 if (!pde) 2657 goto out_mcfilter; 2658 return 0; 2659 2660 out_mcfilter: 2661 proc_net_remove(net, "igmp"); 2662 out_igmp: 2663 return -ENOMEM; 2664 } 2665 2666 static void __net_exit igmp_net_exit(struct net *net) 2667 { 2668 proc_net_remove(net, "mcfilter"); 2669 proc_net_remove(net, "igmp"); 2670 } 2671 2672 static struct pernet_operations igmp_net_ops = { 2673 .init = igmp_net_init, 2674 .exit = igmp_net_exit, 2675 }; 2676 2677 int __init igmp_mc_proc_init(void) 2678 { 2679 return register_pernet_subsys(&igmp_net_ops); 2680 } 2681 #endif 2682 2683 EXPORT_SYMBOL(ip_mc_dec_group); 2684 EXPORT_SYMBOL(ip_mc_inc_group); 2685 EXPORT_SYMBOL(ip_mc_join_group); 2686 EXPORT_SYMBOL(ip_mc_rejoin_group); 2687