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->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->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->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->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 /* called in rcu_read_lock() section */ 920 int igmp_rcv(struct sk_buff *skb) 921 { 922 /* This basically follows the spec line by line -- see RFC1112 */ 923 struct igmphdr *ih; 924 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 925 int len = skb->len; 926 927 if (in_dev == NULL) 928 goto drop; 929 930 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 931 goto drop; 932 933 switch (skb->ip_summed) { 934 case CHECKSUM_COMPLETE: 935 if (!csum_fold(skb->csum)) 936 break; 937 /* fall through */ 938 case CHECKSUM_NONE: 939 skb->csum = 0; 940 if (__skb_checksum_complete(skb)) 941 goto drop; 942 } 943 944 ih = igmp_hdr(skb); 945 switch (ih->type) { 946 case IGMP_HOST_MEMBERSHIP_QUERY: 947 igmp_heard_query(in_dev, skb, len); 948 break; 949 case IGMP_HOST_MEMBERSHIP_REPORT: 950 case IGMPV2_HOST_MEMBERSHIP_REPORT: 951 /* Is it our report looped back? */ 952 if (skb_rtable(skb)->fl.iif == 0) 953 break; 954 /* don't rely on MC router hearing unicast reports */ 955 if (skb->pkt_type == PACKET_MULTICAST || 956 skb->pkt_type == PACKET_BROADCAST) 957 igmp_heard_report(in_dev, ih->group); 958 break; 959 case IGMP_PIM: 960 #ifdef CONFIG_IP_PIMSM_V1 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: 975 kfree_skb(skb); 976 return 0; 977 } 978 979 #endif 980 981 982 /* 983 * Add a filter to a device 984 */ 985 986 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 987 { 988 char buf[MAX_ADDR_LEN]; 989 struct net_device *dev = in_dev->dev; 990 991 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 992 We will get multicast token leakage, when IFF_MULTICAST 993 is changed. This check should be done in dev->set_multicast_list 994 routine. Something sort of: 995 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 996 --ANK 997 */ 998 if (arp_mc_map(addr, buf, dev, 0) == 0) 999 dev_mc_add(dev, buf); 1000 } 1001 1002 /* 1003 * Remove a filter from a device 1004 */ 1005 1006 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1007 { 1008 char buf[MAX_ADDR_LEN]; 1009 struct net_device *dev = in_dev->dev; 1010 1011 if (arp_mc_map(addr, buf, dev, 0) == 0) 1012 dev_mc_del(dev, buf); 1013 } 1014 1015 #ifdef CONFIG_IP_MULTICAST 1016 /* 1017 * deleted ip_mc_list manipulation 1018 */ 1019 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1020 { 1021 struct ip_mc_list *pmc; 1022 1023 /* this is an "ip_mc_list" for convenience; only the fields below 1024 * are actually used. In particular, the refcnt and users are not 1025 * used for management of the delete list. Using the same structure 1026 * for deleted items allows change reports to use common code with 1027 * non-deleted or query-response MCA's. 1028 */ 1029 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1030 if (!pmc) 1031 return; 1032 spin_lock_bh(&im->lock); 1033 pmc->interface = im->interface; 1034 in_dev_hold(in_dev); 1035 pmc->multiaddr = im->multiaddr; 1036 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1037 IGMP_Unsolicited_Report_Count; 1038 pmc->sfmode = im->sfmode; 1039 if (pmc->sfmode == MCAST_INCLUDE) { 1040 struct ip_sf_list *psf; 1041 1042 pmc->tomb = im->tomb; 1043 pmc->sources = im->sources; 1044 im->tomb = im->sources = NULL; 1045 for (psf=pmc->sources; psf; psf=psf->sf_next) 1046 psf->sf_crcount = pmc->crcount; 1047 } 1048 spin_unlock_bh(&im->lock); 1049 1050 spin_lock_bh(&in_dev->mc_tomb_lock); 1051 pmc->next = in_dev->mc_tomb; 1052 in_dev->mc_tomb = pmc; 1053 spin_unlock_bh(&in_dev->mc_tomb_lock); 1054 } 1055 1056 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1057 { 1058 struct ip_mc_list *pmc, *pmc_prev; 1059 struct ip_sf_list *psf, *psf_next; 1060 1061 spin_lock_bh(&in_dev->mc_tomb_lock); 1062 pmc_prev = NULL; 1063 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1064 if (pmc->multiaddr == multiaddr) 1065 break; 1066 pmc_prev = pmc; 1067 } 1068 if (pmc) { 1069 if (pmc_prev) 1070 pmc_prev->next = pmc->next; 1071 else 1072 in_dev->mc_tomb = pmc->next; 1073 } 1074 spin_unlock_bh(&in_dev->mc_tomb_lock); 1075 if (pmc) { 1076 for (psf=pmc->tomb; psf; psf=psf_next) { 1077 psf_next = psf->sf_next; 1078 kfree(psf); 1079 } 1080 in_dev_put(pmc->interface); 1081 kfree(pmc); 1082 } 1083 } 1084 1085 static void igmpv3_clear_delrec(struct in_device *in_dev) 1086 { 1087 struct ip_mc_list *pmc, *nextpmc; 1088 1089 spin_lock_bh(&in_dev->mc_tomb_lock); 1090 pmc = in_dev->mc_tomb; 1091 in_dev->mc_tomb = NULL; 1092 spin_unlock_bh(&in_dev->mc_tomb_lock); 1093 1094 for (; pmc; pmc = nextpmc) { 1095 nextpmc = pmc->next; 1096 ip_mc_clear_src(pmc); 1097 in_dev_put(pmc->interface); 1098 kfree(pmc); 1099 } 1100 /* clear dead sources, too */ 1101 read_lock(&in_dev->mc_list_lock); 1102 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1103 struct ip_sf_list *psf, *psf_next; 1104 1105 spin_lock_bh(&pmc->lock); 1106 psf = pmc->tomb; 1107 pmc->tomb = NULL; 1108 spin_unlock_bh(&pmc->lock); 1109 for (; psf; psf=psf_next) { 1110 psf_next = psf->sf_next; 1111 kfree(psf); 1112 } 1113 } 1114 read_unlock(&in_dev->mc_list_lock); 1115 } 1116 #endif 1117 1118 static void igmp_group_dropped(struct ip_mc_list *im) 1119 { 1120 struct in_device *in_dev = im->interface; 1121 #ifdef CONFIG_IP_MULTICAST 1122 int reporter; 1123 #endif 1124 1125 if (im->loaded) { 1126 im->loaded = 0; 1127 ip_mc_filter_del(in_dev, im->multiaddr); 1128 } 1129 1130 #ifdef CONFIG_IP_MULTICAST 1131 if (im->multiaddr == IGMP_ALL_HOSTS) 1132 return; 1133 1134 reporter = im->reporter; 1135 igmp_stop_timer(im); 1136 1137 if (!in_dev->dead) { 1138 if (IGMP_V1_SEEN(in_dev)) 1139 goto done; 1140 if (IGMP_V2_SEEN(in_dev)) { 1141 if (reporter) 1142 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1143 goto done; 1144 } 1145 /* IGMPv3 */ 1146 igmpv3_add_delrec(in_dev, im); 1147 1148 igmp_ifc_event(in_dev); 1149 } 1150 done: 1151 #endif 1152 ip_mc_clear_src(im); 1153 } 1154 1155 static void igmp_group_added(struct ip_mc_list *im) 1156 { 1157 struct in_device *in_dev = im->interface; 1158 1159 if (im->loaded == 0) { 1160 im->loaded = 1; 1161 ip_mc_filter_add(in_dev, im->multiaddr); 1162 } 1163 1164 #ifdef CONFIG_IP_MULTICAST 1165 if (im->multiaddr == IGMP_ALL_HOSTS) 1166 return; 1167 1168 if (in_dev->dead) 1169 return; 1170 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1171 spin_lock_bh(&im->lock); 1172 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1173 spin_unlock_bh(&im->lock); 1174 return; 1175 } 1176 /* else, v3 */ 1177 1178 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1179 IGMP_Unsolicited_Report_Count; 1180 igmp_ifc_event(in_dev); 1181 #endif 1182 } 1183 1184 1185 /* 1186 * Multicast list managers 1187 */ 1188 1189 1190 /* 1191 * A socket has joined a multicast group on device dev. 1192 */ 1193 1194 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1195 { 1196 struct ip_mc_list *im; 1197 1198 ASSERT_RTNL(); 1199 1200 for (im=in_dev->mc_list; im; im=im->next) { 1201 if (im->multiaddr == addr) { 1202 im->users++; 1203 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1204 goto out; 1205 } 1206 } 1207 1208 im = kmalloc(sizeof(*im), GFP_KERNEL); 1209 if (!im) 1210 goto out; 1211 1212 im->users = 1; 1213 im->interface = in_dev; 1214 in_dev_hold(in_dev); 1215 im->multiaddr = addr; 1216 /* initial mode is (EX, empty) */ 1217 im->sfmode = MCAST_EXCLUDE; 1218 im->sfcount[MCAST_INCLUDE] = 0; 1219 im->sfcount[MCAST_EXCLUDE] = 1; 1220 im->sources = NULL; 1221 im->tomb = NULL; 1222 im->crcount = 0; 1223 atomic_set(&im->refcnt, 1); 1224 spin_lock_init(&im->lock); 1225 #ifdef CONFIG_IP_MULTICAST 1226 im->tm_running = 0; 1227 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1228 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1229 im->reporter = 0; 1230 im->gsquery = 0; 1231 #endif 1232 im->loaded = 0; 1233 write_lock_bh(&in_dev->mc_list_lock); 1234 im->next = in_dev->mc_list; 1235 in_dev->mc_list = im; 1236 in_dev->mc_count++; 1237 write_unlock_bh(&in_dev->mc_list_lock); 1238 #ifdef CONFIG_IP_MULTICAST 1239 igmpv3_del_delrec(in_dev, im->multiaddr); 1240 #endif 1241 igmp_group_added(im); 1242 if (!in_dev->dead) 1243 ip_rt_multicast_event(in_dev); 1244 out: 1245 return; 1246 } 1247 EXPORT_SYMBOL(ip_mc_inc_group); 1248 1249 /* 1250 * Resend IGMP JOIN report; used for bonding. 1251 */ 1252 void ip_mc_rejoin_group(struct ip_mc_list *im) 1253 { 1254 #ifdef CONFIG_IP_MULTICAST 1255 struct in_device *in_dev = im->interface; 1256 1257 if (im->multiaddr == IGMP_ALL_HOSTS) 1258 return; 1259 1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay); 1262 return; 1263 } 1264 /* else, v3 */ 1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1266 IGMP_Unsolicited_Report_Count; 1267 igmp_ifc_event(in_dev); 1268 #endif 1269 } 1270 EXPORT_SYMBOL(ip_mc_rejoin_group); 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 EXPORT_SYMBOL(ip_mc_dec_group); 1302 1303 /* Device changing type */ 1304 1305 void ip_mc_unmap(struct in_device *in_dev) 1306 { 1307 struct ip_mc_list *i; 1308 1309 ASSERT_RTNL(); 1310 1311 for (i = in_dev->mc_list; i; i = i->next) 1312 igmp_group_dropped(i); 1313 } 1314 1315 void ip_mc_remap(struct in_device *in_dev) 1316 { 1317 struct ip_mc_list *i; 1318 1319 ASSERT_RTNL(); 1320 1321 for (i = in_dev->mc_list; i; i = i->next) 1322 igmp_group_added(i); 1323 } 1324 1325 /* Device going down */ 1326 1327 void ip_mc_down(struct in_device *in_dev) 1328 { 1329 struct ip_mc_list *i; 1330 1331 ASSERT_RTNL(); 1332 1333 for (i=in_dev->mc_list; i; i=i->next) 1334 igmp_group_dropped(i); 1335 1336 #ifdef CONFIG_IP_MULTICAST 1337 in_dev->mr_ifc_count = 0; 1338 if (del_timer(&in_dev->mr_ifc_timer)) 1339 __in_dev_put(in_dev); 1340 in_dev->mr_gq_running = 0; 1341 if (del_timer(&in_dev->mr_gq_timer)) 1342 __in_dev_put(in_dev); 1343 igmpv3_clear_delrec(in_dev); 1344 #endif 1345 1346 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1347 } 1348 1349 void ip_mc_init_dev(struct in_device *in_dev) 1350 { 1351 ASSERT_RTNL(); 1352 1353 in_dev->mc_tomb = NULL; 1354 #ifdef CONFIG_IP_MULTICAST 1355 in_dev->mr_gq_running = 0; 1356 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1357 (unsigned long)in_dev); 1358 in_dev->mr_ifc_count = 0; 1359 in_dev->mc_count = 0; 1360 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1361 (unsigned long)in_dev); 1362 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1363 #endif 1364 1365 rwlock_init(&in_dev->mc_list_lock); 1366 spin_lock_init(&in_dev->mc_tomb_lock); 1367 } 1368 1369 /* Device going up */ 1370 1371 void ip_mc_up(struct in_device *in_dev) 1372 { 1373 struct ip_mc_list *i; 1374 1375 ASSERT_RTNL(); 1376 1377 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1378 1379 for (i=in_dev->mc_list; i; i=i->next) 1380 igmp_group_added(i); 1381 } 1382 1383 /* 1384 * Device is about to be destroyed: clean up. 1385 */ 1386 1387 void ip_mc_destroy_dev(struct in_device *in_dev) 1388 { 1389 struct ip_mc_list *i; 1390 1391 ASSERT_RTNL(); 1392 1393 /* Deactivate timers */ 1394 ip_mc_down(in_dev); 1395 1396 write_lock_bh(&in_dev->mc_list_lock); 1397 while ((i = in_dev->mc_list) != NULL) { 1398 in_dev->mc_list = i->next; 1399 in_dev->mc_count--; 1400 write_unlock_bh(&in_dev->mc_list_lock); 1401 igmp_group_dropped(i); 1402 ip_ma_put(i); 1403 1404 write_lock_bh(&in_dev->mc_list_lock); 1405 } 1406 write_unlock_bh(&in_dev->mc_list_lock); 1407 } 1408 1409 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1410 { 1411 struct flowi fl = { .nl_u = { .ip4_u = 1412 { .daddr = imr->imr_multiaddr.s_addr } } }; 1413 struct rtable *rt; 1414 struct net_device *dev = NULL; 1415 struct in_device *idev = NULL; 1416 1417 if (imr->imr_ifindex) { 1418 idev = inetdev_by_index(net, imr->imr_ifindex); 1419 if (idev) 1420 __in_dev_put(idev); 1421 return idev; 1422 } 1423 if (imr->imr_address.s_addr) { 1424 dev = ip_dev_find(net, imr->imr_address.s_addr); 1425 if (!dev) 1426 return NULL; 1427 dev_put(dev); 1428 } 1429 1430 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1431 dev = rt->dst.dev; 1432 ip_rt_put(rt); 1433 } 1434 if (dev) { 1435 imr->imr_ifindex = dev->ifindex; 1436 idev = __in_dev_get_rtnl(dev); 1437 } 1438 return idev; 1439 } 1440 1441 /* 1442 * Join a socket to a group 1443 */ 1444 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1445 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1446 1447 1448 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1449 __be32 *psfsrc) 1450 { 1451 struct ip_sf_list *psf, *psf_prev; 1452 int rv = 0; 1453 1454 psf_prev = NULL; 1455 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1456 if (psf->sf_inaddr == *psfsrc) 1457 break; 1458 psf_prev = psf; 1459 } 1460 if (!psf || psf->sf_count[sfmode] == 0) { 1461 /* source filter not found, or count wrong => bug */ 1462 return -ESRCH; 1463 } 1464 psf->sf_count[sfmode]--; 1465 if (psf->sf_count[sfmode] == 0) { 1466 ip_rt_multicast_event(pmc->interface); 1467 } 1468 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1469 #ifdef CONFIG_IP_MULTICAST 1470 struct in_device *in_dev = pmc->interface; 1471 #endif 1472 1473 /* no more filters for this source */ 1474 if (psf_prev) 1475 psf_prev->sf_next = psf->sf_next; 1476 else 1477 pmc->sources = psf->sf_next; 1478 #ifdef CONFIG_IP_MULTICAST 1479 if (psf->sf_oldin && 1480 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1481 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1482 IGMP_Unsolicited_Report_Count; 1483 psf->sf_next = pmc->tomb; 1484 pmc->tomb = psf; 1485 rv = 1; 1486 } else 1487 #endif 1488 kfree(psf); 1489 } 1490 return rv; 1491 } 1492 1493 #ifndef CONFIG_IP_MULTICAST 1494 #define igmp_ifc_event(x) do { } while (0) 1495 #endif 1496 1497 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1498 int sfcount, __be32 *psfsrc, int delta) 1499 { 1500 struct ip_mc_list *pmc; 1501 int changerec = 0; 1502 int i, err; 1503 1504 if (!in_dev) 1505 return -ENODEV; 1506 read_lock(&in_dev->mc_list_lock); 1507 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1508 if (*pmca == pmc->multiaddr) 1509 break; 1510 } 1511 if (!pmc) { 1512 /* MCA not found?? bug */ 1513 read_unlock(&in_dev->mc_list_lock); 1514 return -ESRCH; 1515 } 1516 spin_lock_bh(&pmc->lock); 1517 read_unlock(&in_dev->mc_list_lock); 1518 #ifdef CONFIG_IP_MULTICAST 1519 sf_markstate(pmc); 1520 #endif 1521 if (!delta) { 1522 err = -EINVAL; 1523 if (!pmc->sfcount[sfmode]) 1524 goto out_unlock; 1525 pmc->sfcount[sfmode]--; 1526 } 1527 err = 0; 1528 for (i=0; i<sfcount; i++) { 1529 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1530 1531 changerec |= rv > 0; 1532 if (!err && rv < 0) 1533 err = rv; 1534 } 1535 if (pmc->sfmode == MCAST_EXCLUDE && 1536 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1537 pmc->sfcount[MCAST_INCLUDE]) { 1538 #ifdef CONFIG_IP_MULTICAST 1539 struct ip_sf_list *psf; 1540 #endif 1541 1542 /* filter mode change */ 1543 pmc->sfmode = MCAST_INCLUDE; 1544 #ifdef CONFIG_IP_MULTICAST 1545 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1546 IGMP_Unsolicited_Report_Count; 1547 in_dev->mr_ifc_count = pmc->crcount; 1548 for (psf=pmc->sources; psf; psf = psf->sf_next) 1549 psf->sf_crcount = 0; 1550 igmp_ifc_event(pmc->interface); 1551 } else if (sf_setstate(pmc) || changerec) { 1552 igmp_ifc_event(pmc->interface); 1553 #endif 1554 } 1555 out_unlock: 1556 spin_unlock_bh(&pmc->lock); 1557 return err; 1558 } 1559 1560 /* 1561 * Add multicast single-source filter to the interface list 1562 */ 1563 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1564 __be32 *psfsrc, int delta) 1565 { 1566 struct ip_sf_list *psf, *psf_prev; 1567 1568 psf_prev = NULL; 1569 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1570 if (psf->sf_inaddr == *psfsrc) 1571 break; 1572 psf_prev = psf; 1573 } 1574 if (!psf) { 1575 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1576 if (!psf) 1577 return -ENOBUFS; 1578 psf->sf_inaddr = *psfsrc; 1579 if (psf_prev) { 1580 psf_prev->sf_next = psf; 1581 } else 1582 pmc->sources = psf; 1583 } 1584 psf->sf_count[sfmode]++; 1585 if (psf->sf_count[sfmode] == 1) { 1586 ip_rt_multicast_event(pmc->interface); 1587 } 1588 return 0; 1589 } 1590 1591 #ifdef CONFIG_IP_MULTICAST 1592 static void sf_markstate(struct ip_mc_list *pmc) 1593 { 1594 struct ip_sf_list *psf; 1595 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1596 1597 for (psf=pmc->sources; psf; psf=psf->sf_next) 1598 if (pmc->sfcount[MCAST_EXCLUDE]) { 1599 psf->sf_oldin = mca_xcount == 1600 psf->sf_count[MCAST_EXCLUDE] && 1601 !psf->sf_count[MCAST_INCLUDE]; 1602 } else 1603 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1604 } 1605 1606 static int sf_setstate(struct ip_mc_list *pmc) 1607 { 1608 struct ip_sf_list *psf, *dpsf; 1609 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1610 int qrv = pmc->interface->mr_qrv; 1611 int new_in, rv; 1612 1613 rv = 0; 1614 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1615 if (pmc->sfcount[MCAST_EXCLUDE]) { 1616 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1617 !psf->sf_count[MCAST_INCLUDE]; 1618 } else 1619 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1620 if (new_in) { 1621 if (!psf->sf_oldin) { 1622 struct ip_sf_list *prev = NULL; 1623 1624 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1625 if (dpsf->sf_inaddr == psf->sf_inaddr) 1626 break; 1627 prev = dpsf; 1628 } 1629 if (dpsf) { 1630 if (prev) 1631 prev->sf_next = dpsf->sf_next; 1632 else 1633 pmc->tomb = dpsf->sf_next; 1634 kfree(dpsf); 1635 } 1636 psf->sf_crcount = qrv; 1637 rv++; 1638 } 1639 } else if (psf->sf_oldin) { 1640 1641 psf->sf_crcount = 0; 1642 /* 1643 * add or update "delete" records if an active filter 1644 * is now inactive 1645 */ 1646 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1647 if (dpsf->sf_inaddr == psf->sf_inaddr) 1648 break; 1649 if (!dpsf) { 1650 dpsf = 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 EXPORT_SYMBOL(ip_mc_join_group); 1811 1812 static void ip_sf_socklist_reclaim(struct rcu_head *rp) 1813 { 1814 struct ip_sf_socklist *psf; 1815 1816 psf = container_of(rp, struct ip_sf_socklist, rcu); 1817 /* sk_omem_alloc should have been decreased by the caller*/ 1818 kfree(psf); 1819 } 1820 1821 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1822 struct in_device *in_dev) 1823 { 1824 struct ip_sf_socklist *psf = iml->sflist; 1825 int err; 1826 1827 if (psf == NULL) { 1828 /* any-source empty exclude case */ 1829 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1830 iml->sfmode, 0, NULL, 0); 1831 } 1832 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1833 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1834 rcu_assign_pointer(iml->sflist, NULL); 1835 /* decrease mem now to avoid the memleak warning */ 1836 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1837 call_rcu(&psf->rcu, ip_sf_socklist_reclaim); 1838 return err; 1839 } 1840 1841 1842 static void ip_mc_socklist_reclaim(struct rcu_head *rp) 1843 { 1844 struct ip_mc_socklist *iml; 1845 1846 iml = container_of(rp, struct ip_mc_socklist, rcu); 1847 /* sk_omem_alloc should have been decreased by the caller*/ 1848 kfree(iml); 1849 } 1850 1851 1852 /* 1853 * Ask a socket to leave a group. 1854 */ 1855 1856 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1857 { 1858 struct inet_sock *inet = inet_sk(sk); 1859 struct ip_mc_socklist *iml, **imlp; 1860 struct in_device *in_dev; 1861 struct net *net = sock_net(sk); 1862 __be32 group = imr->imr_multiaddr.s_addr; 1863 u32 ifindex; 1864 int ret = -EADDRNOTAVAIL; 1865 1866 rtnl_lock(); 1867 in_dev = ip_mc_find_dev(net, imr); 1868 ifindex = imr->imr_ifindex; 1869 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1870 if (iml->multi.imr_multiaddr.s_addr != group) 1871 continue; 1872 if (ifindex) { 1873 if (iml->multi.imr_ifindex != ifindex) 1874 continue; 1875 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1876 iml->multi.imr_address.s_addr) 1877 continue; 1878 1879 (void) ip_mc_leave_src(sk, iml, in_dev); 1880 1881 rcu_assign_pointer(*imlp, iml->next); 1882 1883 if (in_dev) 1884 ip_mc_dec_group(in_dev, group); 1885 rtnl_unlock(); 1886 /* decrease mem now to avoid the memleak warning */ 1887 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1888 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 1889 return 0; 1890 } 1891 if (!in_dev) 1892 ret = -ENODEV; 1893 rtnl_unlock(); 1894 return ret; 1895 } 1896 1897 int ip_mc_source(int add, int omode, struct sock *sk, struct 1898 ip_mreq_source *mreqs, int ifindex) 1899 { 1900 int err; 1901 struct ip_mreqn imr; 1902 __be32 addr = mreqs->imr_multiaddr; 1903 struct ip_mc_socklist *pmc; 1904 struct in_device *in_dev = NULL; 1905 struct inet_sock *inet = inet_sk(sk); 1906 struct ip_sf_socklist *psl; 1907 struct net *net = sock_net(sk); 1908 int leavegroup = 0; 1909 int i, j, rv; 1910 1911 if (!ipv4_is_multicast(addr)) 1912 return -EINVAL; 1913 1914 rtnl_lock(); 1915 1916 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1917 imr.imr_address.s_addr = mreqs->imr_interface; 1918 imr.imr_ifindex = ifindex; 1919 in_dev = ip_mc_find_dev(net, &imr); 1920 1921 if (!in_dev) { 1922 err = -ENODEV; 1923 goto done; 1924 } 1925 err = -EADDRNOTAVAIL; 1926 1927 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1928 if ((pmc->multi.imr_multiaddr.s_addr == 1929 imr.imr_multiaddr.s_addr) && 1930 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1931 break; 1932 } 1933 if (!pmc) { /* must have a prior join */ 1934 err = -EINVAL; 1935 goto done; 1936 } 1937 /* if a source filter was set, must be the same mode as before */ 1938 if (pmc->sflist) { 1939 if (pmc->sfmode != omode) { 1940 err = -EINVAL; 1941 goto done; 1942 } 1943 } else if (pmc->sfmode != omode) { 1944 /* allow mode switches for empty-set filters */ 1945 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1946 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1947 NULL, 0); 1948 pmc->sfmode = omode; 1949 } 1950 1951 psl = pmc->sflist; 1952 if (!add) { 1953 if (!psl) 1954 goto done; /* err = -EADDRNOTAVAIL */ 1955 rv = !0; 1956 for (i=0; i<psl->sl_count; i++) { 1957 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1958 sizeof(__be32)); 1959 if (rv == 0) 1960 break; 1961 } 1962 if (rv) /* source not found */ 1963 goto done; /* err = -EADDRNOTAVAIL */ 1964 1965 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1966 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1967 leavegroup = 1; 1968 goto done; 1969 } 1970 1971 /* update the interface filter */ 1972 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1973 &mreqs->imr_sourceaddr, 1); 1974 1975 for (j=i+1; j<psl->sl_count; j++) 1976 psl->sl_addr[j-1] = psl->sl_addr[j]; 1977 psl->sl_count--; 1978 err = 0; 1979 goto done; 1980 } 1981 /* else, add a new source to the filter */ 1982 1983 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1984 err = -ENOBUFS; 1985 goto done; 1986 } 1987 if (!psl || psl->sl_count == psl->sl_max) { 1988 struct ip_sf_socklist *newpsl; 1989 int count = IP_SFBLOCK; 1990 1991 if (psl) 1992 count += psl->sl_max; 1993 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1994 if (!newpsl) { 1995 err = -ENOBUFS; 1996 goto done; 1997 } 1998 newpsl->sl_max = count; 1999 newpsl->sl_count = count - IP_SFBLOCK; 2000 if (psl) { 2001 for (i=0; i<psl->sl_count; i++) 2002 newpsl->sl_addr[i] = psl->sl_addr[i]; 2003 /* decrease mem now to avoid the memleak warning */ 2004 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2005 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2006 } 2007 rcu_assign_pointer(pmc->sflist, newpsl); 2008 psl = newpsl; 2009 } 2010 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2011 for (i=0; i<psl->sl_count; i++) { 2012 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2013 sizeof(__be32)); 2014 if (rv == 0) 2015 break; 2016 } 2017 if (rv == 0) /* address already there is an error */ 2018 goto done; 2019 for (j=psl->sl_count-1; j>=i; j--) 2020 psl->sl_addr[j+1] = psl->sl_addr[j]; 2021 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2022 psl->sl_count++; 2023 err = 0; 2024 /* update the interface list */ 2025 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2026 &mreqs->imr_sourceaddr, 1); 2027 done: 2028 rtnl_unlock(); 2029 if (leavegroup) 2030 return ip_mc_leave_group(sk, &imr); 2031 return err; 2032 } 2033 2034 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2035 { 2036 int err = 0; 2037 struct ip_mreqn imr; 2038 __be32 addr = msf->imsf_multiaddr; 2039 struct ip_mc_socklist *pmc; 2040 struct in_device *in_dev; 2041 struct inet_sock *inet = inet_sk(sk); 2042 struct ip_sf_socklist *newpsl, *psl; 2043 struct net *net = sock_net(sk); 2044 int leavegroup = 0; 2045 2046 if (!ipv4_is_multicast(addr)) 2047 return -EINVAL; 2048 if (msf->imsf_fmode != MCAST_INCLUDE && 2049 msf->imsf_fmode != MCAST_EXCLUDE) 2050 return -EINVAL; 2051 2052 rtnl_lock(); 2053 2054 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2055 imr.imr_address.s_addr = msf->imsf_interface; 2056 imr.imr_ifindex = ifindex; 2057 in_dev = ip_mc_find_dev(net, &imr); 2058 2059 if (!in_dev) { 2060 err = -ENODEV; 2061 goto done; 2062 } 2063 2064 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2065 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2066 leavegroup = 1; 2067 goto done; 2068 } 2069 2070 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2071 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2072 pmc->multi.imr_ifindex == imr.imr_ifindex) 2073 break; 2074 } 2075 if (!pmc) { /* must have a prior join */ 2076 err = -EINVAL; 2077 goto done; 2078 } 2079 if (msf->imsf_numsrc) { 2080 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2081 GFP_KERNEL); 2082 if (!newpsl) { 2083 err = -ENOBUFS; 2084 goto done; 2085 } 2086 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2087 memcpy(newpsl->sl_addr, msf->imsf_slist, 2088 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2089 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2090 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2091 if (err) { 2092 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2093 goto done; 2094 } 2095 } else { 2096 newpsl = NULL; 2097 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2098 msf->imsf_fmode, 0, NULL, 0); 2099 } 2100 psl = pmc->sflist; 2101 if (psl) { 2102 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2103 psl->sl_count, psl->sl_addr, 0); 2104 /* decrease mem now to avoid the memleak warning */ 2105 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2106 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2107 } else 2108 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2109 0, NULL, 0); 2110 rcu_assign_pointer(pmc->sflist, newpsl); 2111 pmc->sfmode = msf->imsf_fmode; 2112 err = 0; 2113 done: 2114 rtnl_unlock(); 2115 if (leavegroup) 2116 err = ip_mc_leave_group(sk, &imr); 2117 return err; 2118 } 2119 2120 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2121 struct ip_msfilter __user *optval, int __user *optlen) 2122 { 2123 int err, len, count, copycount; 2124 struct ip_mreqn imr; 2125 __be32 addr = msf->imsf_multiaddr; 2126 struct ip_mc_socklist *pmc; 2127 struct in_device *in_dev; 2128 struct inet_sock *inet = inet_sk(sk); 2129 struct ip_sf_socklist *psl; 2130 struct net *net = sock_net(sk); 2131 2132 if (!ipv4_is_multicast(addr)) 2133 return -EINVAL; 2134 2135 rtnl_lock(); 2136 2137 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2138 imr.imr_address.s_addr = msf->imsf_interface; 2139 imr.imr_ifindex = 0; 2140 in_dev = ip_mc_find_dev(net, &imr); 2141 2142 if (!in_dev) { 2143 err = -ENODEV; 2144 goto done; 2145 } 2146 err = -EADDRNOTAVAIL; 2147 2148 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2149 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2150 pmc->multi.imr_ifindex == imr.imr_ifindex) 2151 break; 2152 } 2153 if (!pmc) /* must have a prior join */ 2154 goto done; 2155 msf->imsf_fmode = pmc->sfmode; 2156 psl = pmc->sflist; 2157 rtnl_unlock(); 2158 if (!psl) { 2159 len = 0; 2160 count = 0; 2161 } else { 2162 count = psl->sl_count; 2163 } 2164 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2165 len = copycount * sizeof(psl->sl_addr[0]); 2166 msf->imsf_numsrc = count; 2167 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2168 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2169 return -EFAULT; 2170 } 2171 if (len && 2172 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2173 return -EFAULT; 2174 return 0; 2175 done: 2176 rtnl_unlock(); 2177 return err; 2178 } 2179 2180 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2181 struct group_filter __user *optval, int __user *optlen) 2182 { 2183 int err, i, count, copycount; 2184 struct sockaddr_in *psin; 2185 __be32 addr; 2186 struct ip_mc_socklist *pmc; 2187 struct inet_sock *inet = inet_sk(sk); 2188 struct ip_sf_socklist *psl; 2189 2190 psin = (struct sockaddr_in *)&gsf->gf_group; 2191 if (psin->sin_family != AF_INET) 2192 return -EINVAL; 2193 addr = psin->sin_addr.s_addr; 2194 if (!ipv4_is_multicast(addr)) 2195 return -EINVAL; 2196 2197 rtnl_lock(); 2198 2199 err = -EADDRNOTAVAIL; 2200 2201 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2202 if (pmc->multi.imr_multiaddr.s_addr == addr && 2203 pmc->multi.imr_ifindex == gsf->gf_interface) 2204 break; 2205 } 2206 if (!pmc) /* must have a prior join */ 2207 goto done; 2208 gsf->gf_fmode = pmc->sfmode; 2209 psl = pmc->sflist; 2210 rtnl_unlock(); 2211 count = psl ? psl->sl_count : 0; 2212 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2213 gsf->gf_numsrc = count; 2214 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2215 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2216 return -EFAULT; 2217 } 2218 for (i=0; i<copycount; i++) { 2219 struct sockaddr_storage ss; 2220 2221 psin = (struct sockaddr_in *)&ss; 2222 memset(&ss, 0, sizeof(ss)); 2223 psin->sin_family = AF_INET; 2224 psin->sin_addr.s_addr = psl->sl_addr[i]; 2225 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2226 return -EFAULT; 2227 } 2228 return 0; 2229 done: 2230 rtnl_unlock(); 2231 return err; 2232 } 2233 2234 /* 2235 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2236 */ 2237 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2238 { 2239 struct inet_sock *inet = inet_sk(sk); 2240 struct ip_mc_socklist *pmc; 2241 struct ip_sf_socklist *psl; 2242 int i; 2243 int ret; 2244 2245 ret = 1; 2246 if (!ipv4_is_multicast(loc_addr)) 2247 goto out; 2248 2249 rcu_read_lock(); 2250 for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) { 2251 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2252 pmc->multi.imr_ifindex == dif) 2253 break; 2254 } 2255 ret = inet->mc_all; 2256 if (!pmc) 2257 goto unlock; 2258 psl = pmc->sflist; 2259 ret = (pmc->sfmode == MCAST_EXCLUDE); 2260 if (!psl) 2261 goto unlock; 2262 2263 for (i=0; i<psl->sl_count; i++) { 2264 if (psl->sl_addr[i] == rmt_addr) 2265 break; 2266 } 2267 ret = 0; 2268 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2269 goto unlock; 2270 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2271 goto unlock; 2272 ret = 1; 2273 unlock: 2274 rcu_read_unlock(); 2275 out: 2276 return ret; 2277 } 2278 2279 /* 2280 * A socket is closing. 2281 */ 2282 2283 void ip_mc_drop_socket(struct sock *sk) 2284 { 2285 struct inet_sock *inet = inet_sk(sk); 2286 struct ip_mc_socklist *iml; 2287 struct net *net = sock_net(sk); 2288 2289 if (inet->mc_list == NULL) 2290 return; 2291 2292 rtnl_lock(); 2293 while ((iml = inet->mc_list) != NULL) { 2294 struct in_device *in_dev; 2295 rcu_assign_pointer(inet->mc_list, iml->next); 2296 2297 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2298 (void) ip_mc_leave_src(sk, iml, in_dev); 2299 if (in_dev != NULL) { 2300 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2301 in_dev_put(in_dev); 2302 } 2303 /* decrease mem now to avoid the memleak warning */ 2304 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2305 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 2306 } 2307 rtnl_unlock(); 2308 } 2309 2310 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2311 { 2312 struct ip_mc_list *im; 2313 struct ip_sf_list *psf; 2314 int rv = 0; 2315 2316 read_lock(&in_dev->mc_list_lock); 2317 for (im=in_dev->mc_list; im; im=im->next) { 2318 if (im->multiaddr == mc_addr) 2319 break; 2320 } 2321 if (im && proto == IPPROTO_IGMP) { 2322 rv = 1; 2323 } else if (im) { 2324 if (src_addr) { 2325 for (psf=im->sources; psf; psf=psf->sf_next) { 2326 if (psf->sf_inaddr == src_addr) 2327 break; 2328 } 2329 if (psf) 2330 rv = psf->sf_count[MCAST_INCLUDE] || 2331 psf->sf_count[MCAST_EXCLUDE] != 2332 im->sfcount[MCAST_EXCLUDE]; 2333 else 2334 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2335 } else 2336 rv = 1; /* unspecified source; tentatively allow */ 2337 } 2338 read_unlock(&in_dev->mc_list_lock); 2339 return rv; 2340 } 2341 2342 #if defined(CONFIG_PROC_FS) 2343 struct igmp_mc_iter_state { 2344 struct seq_net_private p; 2345 struct net_device *dev; 2346 struct in_device *in_dev; 2347 }; 2348 2349 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2350 2351 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2352 { 2353 struct net *net = seq_file_net(seq); 2354 struct ip_mc_list *im = NULL; 2355 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2356 2357 state->in_dev = NULL; 2358 for_each_netdev_rcu(net, state->dev) { 2359 struct in_device *in_dev; 2360 2361 in_dev = __in_dev_get_rcu(state->dev); 2362 if (!in_dev) 2363 continue; 2364 read_lock(&in_dev->mc_list_lock); 2365 im = in_dev->mc_list; 2366 if (im) { 2367 state->in_dev = in_dev; 2368 break; 2369 } 2370 read_unlock(&in_dev->mc_list_lock); 2371 } 2372 return im; 2373 } 2374 2375 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2376 { 2377 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2378 im = im->next; 2379 while (!im) { 2380 if (likely(state->in_dev != NULL)) 2381 read_unlock(&state->in_dev->mc_list_lock); 2382 2383 state->dev = next_net_device_rcu(state->dev); 2384 if (!state->dev) { 2385 state->in_dev = NULL; 2386 break; 2387 } 2388 state->in_dev = __in_dev_get_rcu(state->dev); 2389 if (!state->in_dev) 2390 continue; 2391 read_lock(&state->in_dev->mc_list_lock); 2392 im = state->in_dev->mc_list; 2393 } 2394 return im; 2395 } 2396 2397 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2398 { 2399 struct ip_mc_list *im = igmp_mc_get_first(seq); 2400 if (im) 2401 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2402 --pos; 2403 return pos ? NULL : im; 2404 } 2405 2406 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2407 __acquires(rcu) 2408 { 2409 rcu_read_lock(); 2410 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2411 } 2412 2413 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2414 { 2415 struct ip_mc_list *im; 2416 if (v == SEQ_START_TOKEN) 2417 im = igmp_mc_get_first(seq); 2418 else 2419 im = igmp_mc_get_next(seq, v); 2420 ++*pos; 2421 return im; 2422 } 2423 2424 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2425 __releases(rcu) 2426 { 2427 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2428 if (likely(state->in_dev != NULL)) { 2429 read_unlock(&state->in_dev->mc_list_lock); 2430 state->in_dev = NULL; 2431 } 2432 state->dev = NULL; 2433 rcu_read_unlock(); 2434 } 2435 2436 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2437 { 2438 if (v == SEQ_START_TOKEN) 2439 seq_puts(seq, 2440 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2441 else { 2442 struct ip_mc_list *im = (struct ip_mc_list *)v; 2443 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2444 char *querier; 2445 #ifdef CONFIG_IP_MULTICAST 2446 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2447 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2448 "V3"; 2449 #else 2450 querier = "NONE"; 2451 #endif 2452 2453 if (state->in_dev->mc_list == im) { 2454 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2455 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2456 } 2457 2458 seq_printf(seq, 2459 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2460 im->multiaddr, im->users, 2461 im->tm_running, im->tm_running ? 2462 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2463 im->reporter); 2464 } 2465 return 0; 2466 } 2467 2468 static const struct seq_operations igmp_mc_seq_ops = { 2469 .start = igmp_mc_seq_start, 2470 .next = igmp_mc_seq_next, 2471 .stop = igmp_mc_seq_stop, 2472 .show = igmp_mc_seq_show, 2473 }; 2474 2475 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2476 { 2477 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2478 sizeof(struct igmp_mc_iter_state)); 2479 } 2480 2481 static const struct file_operations igmp_mc_seq_fops = { 2482 .owner = THIS_MODULE, 2483 .open = igmp_mc_seq_open, 2484 .read = seq_read, 2485 .llseek = seq_lseek, 2486 .release = seq_release_net, 2487 }; 2488 2489 struct igmp_mcf_iter_state { 2490 struct seq_net_private p; 2491 struct net_device *dev; 2492 struct in_device *idev; 2493 struct ip_mc_list *im; 2494 }; 2495 2496 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2497 2498 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2499 { 2500 struct net *net = seq_file_net(seq); 2501 struct ip_sf_list *psf = NULL; 2502 struct ip_mc_list *im = NULL; 2503 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2504 2505 state->idev = NULL; 2506 state->im = NULL; 2507 for_each_netdev_rcu(net, state->dev) { 2508 struct in_device *idev; 2509 idev = __in_dev_get_rcu(state->dev); 2510 if (unlikely(idev == NULL)) 2511 continue; 2512 read_lock(&idev->mc_list_lock); 2513 im = idev->mc_list; 2514 if (likely(im != NULL)) { 2515 spin_lock_bh(&im->lock); 2516 psf = im->sources; 2517 if (likely(psf != NULL)) { 2518 state->im = im; 2519 state->idev = idev; 2520 break; 2521 } 2522 spin_unlock_bh(&im->lock); 2523 } 2524 read_unlock(&idev->mc_list_lock); 2525 } 2526 return psf; 2527 } 2528 2529 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2530 { 2531 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2532 2533 psf = psf->sf_next; 2534 while (!psf) { 2535 spin_unlock_bh(&state->im->lock); 2536 state->im = state->im->next; 2537 while (!state->im) { 2538 if (likely(state->idev != NULL)) 2539 read_unlock(&state->idev->mc_list_lock); 2540 2541 state->dev = next_net_device_rcu(state->dev); 2542 if (!state->dev) { 2543 state->idev = NULL; 2544 goto out; 2545 } 2546 state->idev = __in_dev_get_rcu(state->dev); 2547 if (!state->idev) 2548 continue; 2549 read_lock(&state->idev->mc_list_lock); 2550 state->im = state->idev->mc_list; 2551 } 2552 if (!state->im) 2553 break; 2554 spin_lock_bh(&state->im->lock); 2555 psf = state->im->sources; 2556 } 2557 out: 2558 return psf; 2559 } 2560 2561 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2562 { 2563 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2564 if (psf) 2565 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2566 --pos; 2567 return pos ? NULL : psf; 2568 } 2569 2570 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2571 __acquires(rcu) 2572 { 2573 rcu_read_lock(); 2574 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2575 } 2576 2577 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2578 { 2579 struct ip_sf_list *psf; 2580 if (v == SEQ_START_TOKEN) 2581 psf = igmp_mcf_get_first(seq); 2582 else 2583 psf = igmp_mcf_get_next(seq, v); 2584 ++*pos; 2585 return psf; 2586 } 2587 2588 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2589 __releases(rcu) 2590 { 2591 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2592 if (likely(state->im != NULL)) { 2593 spin_unlock_bh(&state->im->lock); 2594 state->im = NULL; 2595 } 2596 if (likely(state->idev != NULL)) { 2597 read_unlock(&state->idev->mc_list_lock); 2598 state->idev = NULL; 2599 } 2600 state->dev = NULL; 2601 rcu_read_unlock(); 2602 } 2603 2604 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2605 { 2606 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2607 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2608 2609 if (v == SEQ_START_TOKEN) { 2610 seq_printf(seq, 2611 "%3s %6s " 2612 "%10s %10s %6s %6s\n", "Idx", 2613 "Device", "MCA", 2614 "SRC", "INC", "EXC"); 2615 } else { 2616 seq_printf(seq, 2617 "%3d %6.6s 0x%08x " 2618 "0x%08x %6lu %6lu\n", 2619 state->dev->ifindex, state->dev->name, 2620 ntohl(state->im->multiaddr), 2621 ntohl(psf->sf_inaddr), 2622 psf->sf_count[MCAST_INCLUDE], 2623 psf->sf_count[MCAST_EXCLUDE]); 2624 } 2625 return 0; 2626 } 2627 2628 static const struct seq_operations igmp_mcf_seq_ops = { 2629 .start = igmp_mcf_seq_start, 2630 .next = igmp_mcf_seq_next, 2631 .stop = igmp_mcf_seq_stop, 2632 .show = igmp_mcf_seq_show, 2633 }; 2634 2635 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2636 { 2637 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2638 sizeof(struct igmp_mcf_iter_state)); 2639 } 2640 2641 static const struct file_operations igmp_mcf_seq_fops = { 2642 .owner = THIS_MODULE, 2643 .open = igmp_mcf_seq_open, 2644 .read = seq_read, 2645 .llseek = seq_lseek, 2646 .release = seq_release_net, 2647 }; 2648 2649 static int __net_init igmp_net_init(struct net *net) 2650 { 2651 struct proc_dir_entry *pde; 2652 2653 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2654 if (!pde) 2655 goto out_igmp; 2656 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2657 if (!pde) 2658 goto out_mcfilter; 2659 return 0; 2660 2661 out_mcfilter: 2662 proc_net_remove(net, "igmp"); 2663 out_igmp: 2664 return -ENOMEM; 2665 } 2666 2667 static void __net_exit igmp_net_exit(struct net *net) 2668 { 2669 proc_net_remove(net, "mcfilter"); 2670 proc_net_remove(net, "igmp"); 2671 } 2672 2673 static struct pernet_operations igmp_net_ops = { 2674 .init = igmp_net_init, 2675 .exit = igmp_net_exit, 2676 }; 2677 2678 int __init igmp_mc_proc_init(void) 2679 { 2680 return register_pernet_subsys(&igmp_net_ops); 2681 } 2682 #endif 2683