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); 151 152 153 static void ip_mc_list_reclaim(struct rcu_head *head) 154 { 155 kfree(container_of(head, struct ip_mc_list, rcu)); 156 } 157 158 static void ip_ma_put(struct ip_mc_list *im) 159 { 160 if (atomic_dec_and_test(&im->refcnt)) { 161 in_dev_put(im->interface); 162 call_rcu(&im->rcu, ip_mc_list_reclaim); 163 } 164 } 165 166 #define for_each_pmc_rcu(in_dev, pmc) \ 167 for (pmc = rcu_dereference(in_dev->mc_list); \ 168 pmc != NULL; \ 169 pmc = rcu_dereference(pmc->next_rcu)) 170 171 #define for_each_pmc_rtnl(in_dev, pmc) \ 172 for (pmc = rtnl_dereference(in_dev->mc_list); \ 173 pmc != NULL; \ 174 pmc = rtnl_dereference(pmc->next_rcu)) 175 176 #ifdef CONFIG_IP_MULTICAST 177 178 /* 179 * Timer management 180 */ 181 182 static void igmp_stop_timer(struct ip_mc_list *im) 183 { 184 spin_lock_bh(&im->lock); 185 if (del_timer(&im->timer)) 186 atomic_dec(&im->refcnt); 187 im->tm_running = 0; 188 im->reporter = 0; 189 im->unsolicit_count = 0; 190 spin_unlock_bh(&im->lock); 191 } 192 193 /* It must be called with locked im->lock */ 194 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 195 { 196 int tv = net_random() % max_delay; 197 198 im->tm_running = 1; 199 if (!mod_timer(&im->timer, jiffies+tv+2)) 200 atomic_inc(&im->refcnt); 201 } 202 203 static void igmp_gq_start_timer(struct in_device *in_dev) 204 { 205 int tv = net_random() % in_dev->mr_maxdelay; 206 207 in_dev->mr_gq_running = 1; 208 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 209 in_dev_hold(in_dev); 210 } 211 212 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 213 { 214 int tv = net_random() % delay; 215 216 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 217 in_dev_hold(in_dev); 218 } 219 220 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 221 { 222 spin_lock_bh(&im->lock); 223 im->unsolicit_count = 0; 224 if (del_timer(&im->timer)) { 225 if ((long)(im->timer.expires-jiffies) < max_delay) { 226 add_timer(&im->timer); 227 im->tm_running = 1; 228 spin_unlock_bh(&im->lock); 229 return; 230 } 231 atomic_dec(&im->refcnt); 232 } 233 igmp_start_timer(im, max_delay); 234 spin_unlock_bh(&im->lock); 235 } 236 237 238 /* 239 * Send an IGMP report. 240 */ 241 242 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 243 244 245 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 246 int gdeleted, int sdeleted) 247 { 248 switch (type) { 249 case IGMPV3_MODE_IS_INCLUDE: 250 case IGMPV3_MODE_IS_EXCLUDE: 251 if (gdeleted || sdeleted) 252 return 0; 253 if (!(pmc->gsquery && !psf->sf_gsresp)) { 254 if (pmc->sfmode == MCAST_INCLUDE) 255 return 1; 256 /* don't include if this source is excluded 257 * in all filters 258 */ 259 if (psf->sf_count[MCAST_INCLUDE]) 260 return type == IGMPV3_MODE_IS_INCLUDE; 261 return pmc->sfcount[MCAST_EXCLUDE] == 262 psf->sf_count[MCAST_EXCLUDE]; 263 } 264 return 0; 265 case IGMPV3_CHANGE_TO_INCLUDE: 266 if (gdeleted || sdeleted) 267 return 0; 268 return psf->sf_count[MCAST_INCLUDE] != 0; 269 case IGMPV3_CHANGE_TO_EXCLUDE: 270 if (gdeleted || sdeleted) 271 return 0; 272 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 273 psf->sf_count[MCAST_INCLUDE]) 274 return 0; 275 return pmc->sfcount[MCAST_EXCLUDE] == 276 psf->sf_count[MCAST_EXCLUDE]; 277 case IGMPV3_ALLOW_NEW_SOURCES: 278 if (gdeleted || !psf->sf_crcount) 279 return 0; 280 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 281 case IGMPV3_BLOCK_OLD_SOURCES: 282 if (pmc->sfmode == MCAST_INCLUDE) 283 return gdeleted || (psf->sf_crcount && sdeleted); 284 return psf->sf_crcount && !gdeleted && !sdeleted; 285 } 286 return 0; 287 } 288 289 static int 290 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 291 { 292 struct ip_sf_list *psf; 293 int scount = 0; 294 295 for (psf=pmc->sources; psf; psf=psf->sf_next) { 296 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 297 continue; 298 scount++; 299 } 300 return scount; 301 } 302 303 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) 304 305 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 306 { 307 struct sk_buff *skb; 308 struct rtable *rt; 309 struct iphdr *pip; 310 struct igmpv3_report *pig; 311 struct net *net = dev_net(dev); 312 313 while (1) { 314 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), 315 GFP_ATOMIC | __GFP_NOWARN); 316 if (skb) 317 break; 318 size >>= 1; 319 if (size < 256) 320 return NULL; 321 } 322 igmp_skb_size(skb) = size; 323 324 { 325 struct flowi fl = { .oif = dev->ifindex, 326 .fl4_dst = IGMPV3_ALL_MCR, 327 .proto = IPPROTO_IGMP }; 328 if (ip_route_output_key(net, &rt, &fl)) { 329 kfree_skb(skb); 330 return NULL; 331 } 332 } 333 if (rt->rt_src == 0) { 334 kfree_skb(skb); 335 ip_rt_put(rt); 336 return NULL; 337 } 338 339 skb_dst_set(skb, &rt->dst); 340 skb->dev = dev; 341 342 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 343 344 skb_reset_network_header(skb); 345 pip = ip_hdr(skb); 346 skb_put(skb, sizeof(struct iphdr) + 4); 347 348 pip->version = 4; 349 pip->ihl = (sizeof(struct iphdr)+4)>>2; 350 pip->tos = 0xc0; 351 pip->frag_off = htons(IP_DF); 352 pip->ttl = 1; 353 pip->daddr = rt->rt_dst; 354 pip->saddr = rt->rt_src; 355 pip->protocol = IPPROTO_IGMP; 356 pip->tot_len = 0; /* filled in later */ 357 ip_select_ident(pip, &rt->dst, NULL); 358 ((u8*)&pip[1])[0] = IPOPT_RA; 359 ((u8*)&pip[1])[1] = 4; 360 ((u8*)&pip[1])[2] = 0; 361 ((u8*)&pip[1])[3] = 0; 362 363 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 364 skb_put(skb, sizeof(*pig)); 365 pig = igmpv3_report_hdr(skb); 366 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 367 pig->resv1 = 0; 368 pig->csum = 0; 369 pig->resv2 = 0; 370 pig->ngrec = 0; 371 return skb; 372 } 373 374 static int igmpv3_sendpack(struct sk_buff *skb) 375 { 376 struct igmphdr *pig = igmp_hdr(skb); 377 const int igmplen = skb->tail - skb->transport_header; 378 379 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 380 381 return ip_local_out(skb); 382 } 383 384 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 385 { 386 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 387 } 388 389 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 390 int type, struct igmpv3_grec **ppgr) 391 { 392 struct net_device *dev = pmc->interface->dev; 393 struct igmpv3_report *pih; 394 struct igmpv3_grec *pgr; 395 396 if (!skb) 397 skb = igmpv3_newpack(dev, dev->mtu); 398 if (!skb) 399 return NULL; 400 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 401 pgr->grec_type = type; 402 pgr->grec_auxwords = 0; 403 pgr->grec_nsrcs = 0; 404 pgr->grec_mca = pmc->multiaddr; 405 pih = igmpv3_report_hdr(skb); 406 pih->ngrec = htons(ntohs(pih->ngrec)+1); 407 *ppgr = pgr; 408 return skb; 409 } 410 411 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ 412 skb_tailroom(skb)) : 0) 413 414 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 415 int type, int gdeleted, int sdeleted) 416 { 417 struct net_device *dev = pmc->interface->dev; 418 struct igmpv3_report *pih; 419 struct igmpv3_grec *pgr = NULL; 420 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 421 int scount, stotal, first, isquery, truncate; 422 423 if (pmc->multiaddr == IGMP_ALL_HOSTS) 424 return skb; 425 426 isquery = type == IGMPV3_MODE_IS_INCLUDE || 427 type == IGMPV3_MODE_IS_EXCLUDE; 428 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 429 type == IGMPV3_CHANGE_TO_EXCLUDE; 430 431 stotal = scount = 0; 432 433 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 434 435 if (!*psf_list) 436 goto empty_source; 437 438 pih = skb ? igmpv3_report_hdr(skb) : NULL; 439 440 /* EX and TO_EX get a fresh packet, if needed */ 441 if (truncate) { 442 if (pih && pih->ngrec && 443 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 444 if (skb) 445 igmpv3_sendpack(skb); 446 skb = igmpv3_newpack(dev, dev->mtu); 447 } 448 } 449 first = 1; 450 psf_prev = NULL; 451 for (psf=*psf_list; psf; psf=psf_next) { 452 __be32 *psrc; 453 454 psf_next = psf->sf_next; 455 456 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 457 psf_prev = psf; 458 continue; 459 } 460 461 /* clear marks on query responses */ 462 if (isquery) 463 psf->sf_gsresp = 0; 464 465 if (AVAILABLE(skb) < sizeof(__be32) + 466 first*sizeof(struct igmpv3_grec)) { 467 if (truncate && !first) 468 break; /* truncate these */ 469 if (pgr) 470 pgr->grec_nsrcs = htons(scount); 471 if (skb) 472 igmpv3_sendpack(skb); 473 skb = igmpv3_newpack(dev, dev->mtu); 474 first = 1; 475 scount = 0; 476 } 477 if (first) { 478 skb = add_grhead(skb, pmc, type, &pgr); 479 first = 0; 480 } 481 if (!skb) 482 return NULL; 483 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 484 *psrc = psf->sf_inaddr; 485 scount++; stotal++; 486 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 487 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 488 psf->sf_crcount--; 489 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 490 if (psf_prev) 491 psf_prev->sf_next = psf->sf_next; 492 else 493 *psf_list = psf->sf_next; 494 kfree(psf); 495 continue; 496 } 497 } 498 psf_prev = psf; 499 } 500 501 empty_source: 502 if (!stotal) { 503 if (type == IGMPV3_ALLOW_NEW_SOURCES || 504 type == IGMPV3_BLOCK_OLD_SOURCES) 505 return skb; 506 if (pmc->crcount || isquery) { 507 /* make sure we have room for group header */ 508 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 509 igmpv3_sendpack(skb); 510 skb = NULL; /* add_grhead will get a new one */ 511 } 512 skb = add_grhead(skb, pmc, type, &pgr); 513 } 514 } 515 if (pgr) 516 pgr->grec_nsrcs = htons(scount); 517 518 if (isquery) 519 pmc->gsquery = 0; /* clear query state on report */ 520 return skb; 521 } 522 523 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 524 { 525 struct sk_buff *skb = NULL; 526 int type; 527 528 if (!pmc) { 529 rcu_read_lock(); 530 for_each_pmc_rcu(in_dev, pmc) { 531 if (pmc->multiaddr == IGMP_ALL_HOSTS) 532 continue; 533 spin_lock_bh(&pmc->lock); 534 if (pmc->sfcount[MCAST_EXCLUDE]) 535 type = IGMPV3_MODE_IS_EXCLUDE; 536 else 537 type = IGMPV3_MODE_IS_INCLUDE; 538 skb = add_grec(skb, pmc, type, 0, 0); 539 spin_unlock_bh(&pmc->lock); 540 } 541 rcu_read_unlock(); 542 } else { 543 spin_lock_bh(&pmc->lock); 544 if (pmc->sfcount[MCAST_EXCLUDE]) 545 type = IGMPV3_MODE_IS_EXCLUDE; 546 else 547 type = IGMPV3_MODE_IS_INCLUDE; 548 skb = add_grec(skb, pmc, type, 0, 0); 549 spin_unlock_bh(&pmc->lock); 550 } 551 if (!skb) 552 return 0; 553 return igmpv3_sendpack(skb); 554 } 555 556 /* 557 * remove zero-count source records from a source filter list 558 */ 559 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 560 { 561 struct ip_sf_list *psf_prev, *psf_next, *psf; 562 563 psf_prev = NULL; 564 for (psf=*ppsf; psf; psf = psf_next) { 565 psf_next = psf->sf_next; 566 if (psf->sf_crcount == 0) { 567 if (psf_prev) 568 psf_prev->sf_next = psf->sf_next; 569 else 570 *ppsf = psf->sf_next; 571 kfree(psf); 572 } else 573 psf_prev = psf; 574 } 575 } 576 577 static void igmpv3_send_cr(struct in_device *in_dev) 578 { 579 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 580 struct sk_buff *skb = NULL; 581 int type, dtype; 582 583 rcu_read_lock(); 584 spin_lock_bh(&in_dev->mc_tomb_lock); 585 586 /* deleted MCA's */ 587 pmc_prev = NULL; 588 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 589 pmc_next = pmc->next; 590 if (pmc->sfmode == MCAST_INCLUDE) { 591 type = IGMPV3_BLOCK_OLD_SOURCES; 592 dtype = IGMPV3_BLOCK_OLD_SOURCES; 593 skb = add_grec(skb, pmc, type, 1, 0); 594 skb = add_grec(skb, pmc, dtype, 1, 1); 595 } 596 if (pmc->crcount) { 597 if (pmc->sfmode == MCAST_EXCLUDE) { 598 type = IGMPV3_CHANGE_TO_INCLUDE; 599 skb = add_grec(skb, pmc, type, 1, 0); 600 } 601 pmc->crcount--; 602 if (pmc->crcount == 0) { 603 igmpv3_clear_zeros(&pmc->tomb); 604 igmpv3_clear_zeros(&pmc->sources); 605 } 606 } 607 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 608 if (pmc_prev) 609 pmc_prev->next = pmc_next; 610 else 611 in_dev->mc_tomb = pmc_next; 612 in_dev_put(pmc->interface); 613 kfree(pmc); 614 } else 615 pmc_prev = pmc; 616 } 617 spin_unlock_bh(&in_dev->mc_tomb_lock); 618 619 /* change recs */ 620 for_each_pmc_rcu(in_dev, pmc) { 621 spin_lock_bh(&pmc->lock); 622 if (pmc->sfcount[MCAST_EXCLUDE]) { 623 type = IGMPV3_BLOCK_OLD_SOURCES; 624 dtype = IGMPV3_ALLOW_NEW_SOURCES; 625 } else { 626 type = IGMPV3_ALLOW_NEW_SOURCES; 627 dtype = IGMPV3_BLOCK_OLD_SOURCES; 628 } 629 skb = add_grec(skb, pmc, type, 0, 0); 630 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 631 632 /* filter mode changes */ 633 if (pmc->crcount) { 634 if (pmc->sfmode == MCAST_EXCLUDE) 635 type = IGMPV3_CHANGE_TO_EXCLUDE; 636 else 637 type = IGMPV3_CHANGE_TO_INCLUDE; 638 skb = add_grec(skb, pmc, type, 0, 0); 639 pmc->crcount--; 640 } 641 spin_unlock_bh(&pmc->lock); 642 } 643 rcu_read_unlock(); 644 645 if (!skb) 646 return; 647 (void) igmpv3_sendpack(skb); 648 } 649 650 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 651 int type) 652 { 653 struct sk_buff *skb; 654 struct iphdr *iph; 655 struct igmphdr *ih; 656 struct rtable *rt; 657 struct net_device *dev = in_dev->dev; 658 struct net *net = dev_net(dev); 659 __be32 group = pmc ? pmc->multiaddr : 0; 660 __be32 dst; 661 662 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 663 return igmpv3_send_report(in_dev, pmc); 664 else if (type == IGMP_HOST_LEAVE_MESSAGE) 665 dst = IGMP_ALL_ROUTER; 666 else 667 dst = group; 668 669 { 670 struct flowi fl = { .oif = dev->ifindex, 671 .fl4_dst = dst, 672 .proto = IPPROTO_IGMP }; 673 if (ip_route_output_key(net, &rt, &fl)) 674 return -1; 675 } 676 if (rt->rt_src == 0) { 677 ip_rt_put(rt); 678 return -1; 679 } 680 681 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 682 if (skb == NULL) { 683 ip_rt_put(rt); 684 return -1; 685 } 686 687 skb_dst_set(skb, &rt->dst); 688 689 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 690 691 skb_reset_network_header(skb); 692 iph = ip_hdr(skb); 693 skb_put(skb, sizeof(struct iphdr) + 4); 694 695 iph->version = 4; 696 iph->ihl = (sizeof(struct iphdr)+4)>>2; 697 iph->tos = 0xc0; 698 iph->frag_off = htons(IP_DF); 699 iph->ttl = 1; 700 iph->daddr = dst; 701 iph->saddr = rt->rt_src; 702 iph->protocol = IPPROTO_IGMP; 703 ip_select_ident(iph, &rt->dst, NULL); 704 ((u8*)&iph[1])[0] = IPOPT_RA; 705 ((u8*)&iph[1])[1] = 4; 706 ((u8*)&iph[1])[2] = 0; 707 ((u8*)&iph[1])[3] = 0; 708 709 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 710 ih->type = type; 711 ih->code = 0; 712 ih->csum = 0; 713 ih->group = group; 714 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 715 716 return ip_local_out(skb); 717 } 718 719 static void igmp_gq_timer_expire(unsigned long data) 720 { 721 struct in_device *in_dev = (struct in_device *)data; 722 723 in_dev->mr_gq_running = 0; 724 igmpv3_send_report(in_dev, NULL); 725 __in_dev_put(in_dev); 726 } 727 728 static void igmp_ifc_timer_expire(unsigned long data) 729 { 730 struct in_device *in_dev = (struct in_device *)data; 731 732 igmpv3_send_cr(in_dev); 733 if (in_dev->mr_ifc_count) { 734 in_dev->mr_ifc_count--; 735 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 736 } 737 __in_dev_put(in_dev); 738 } 739 740 static void igmp_ifc_event(struct in_device *in_dev) 741 { 742 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 743 return; 744 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 745 IGMP_Unsolicited_Report_Count; 746 igmp_ifc_start_timer(in_dev, 1); 747 } 748 749 750 static void igmp_timer_expire(unsigned long data) 751 { 752 struct ip_mc_list *im=(struct ip_mc_list *)data; 753 struct in_device *in_dev = im->interface; 754 755 spin_lock(&im->lock); 756 im->tm_running = 0; 757 758 if (im->unsolicit_count) { 759 im->unsolicit_count--; 760 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 761 } 762 im->reporter = 1; 763 spin_unlock(&im->lock); 764 765 if (IGMP_V1_SEEN(in_dev)) 766 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 767 else if (IGMP_V2_SEEN(in_dev)) 768 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 769 else 770 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 771 772 ip_ma_put(im); 773 } 774 775 /* mark EXCLUDE-mode sources */ 776 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 777 { 778 struct ip_sf_list *psf; 779 int i, scount; 780 781 scount = 0; 782 for (psf=pmc->sources; psf; psf=psf->sf_next) { 783 if (scount == nsrcs) 784 break; 785 for (i=0; i<nsrcs; i++) { 786 /* skip inactive filters */ 787 if (pmc->sfcount[MCAST_INCLUDE] || 788 pmc->sfcount[MCAST_EXCLUDE] != 789 psf->sf_count[MCAST_EXCLUDE]) 790 continue; 791 if (srcs[i] == psf->sf_inaddr) { 792 scount++; 793 break; 794 } 795 } 796 } 797 pmc->gsquery = 0; 798 if (scount == nsrcs) /* all sources excluded */ 799 return 0; 800 return 1; 801 } 802 803 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 804 { 805 struct ip_sf_list *psf; 806 int i, scount; 807 808 if (pmc->sfmode == MCAST_EXCLUDE) 809 return igmp_xmarksources(pmc, nsrcs, srcs); 810 811 /* mark INCLUDE-mode sources */ 812 scount = 0; 813 for (psf=pmc->sources; psf; psf=psf->sf_next) { 814 if (scount == nsrcs) 815 break; 816 for (i=0; i<nsrcs; i++) 817 if (srcs[i] == psf->sf_inaddr) { 818 psf->sf_gsresp = 1; 819 scount++; 820 break; 821 } 822 } 823 if (!scount) { 824 pmc->gsquery = 0; 825 return 0; 826 } 827 pmc->gsquery = 1; 828 return 1; 829 } 830 831 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 832 { 833 struct ip_mc_list *im; 834 835 /* Timers are only set for non-local groups */ 836 837 if (group == IGMP_ALL_HOSTS) 838 return; 839 840 rcu_read_lock(); 841 for_each_pmc_rcu(in_dev, im) { 842 if (im->multiaddr == group) { 843 igmp_stop_timer(im); 844 break; 845 } 846 } 847 rcu_read_unlock(); 848 } 849 850 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 851 int len) 852 { 853 struct igmphdr *ih = igmp_hdr(skb); 854 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 855 struct ip_mc_list *im; 856 __be32 group = ih->group; 857 int max_delay; 858 int mark = 0; 859 860 861 if (len == 8) { 862 if (ih->code == 0) { 863 /* Alas, old v1 router presents here. */ 864 865 max_delay = IGMP_Query_Response_Interval; 866 in_dev->mr_v1_seen = jiffies + 867 IGMP_V1_Router_Present_Timeout; 868 group = 0; 869 } else { 870 /* v2 router present */ 871 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 872 in_dev->mr_v2_seen = jiffies + 873 IGMP_V2_Router_Present_Timeout; 874 } 875 /* cancel the interface change timer */ 876 in_dev->mr_ifc_count = 0; 877 if (del_timer(&in_dev->mr_ifc_timer)) 878 __in_dev_put(in_dev); 879 /* clear deleted report items */ 880 igmpv3_clear_delrec(in_dev); 881 } else if (len < 12) { 882 return; /* ignore bogus packet; freed by caller */ 883 } else if (IGMP_V1_SEEN(in_dev)) { 884 /* This is a v3 query with v1 queriers present */ 885 max_delay = IGMP_Query_Response_Interval; 886 group = 0; 887 } else if (IGMP_V2_SEEN(in_dev)) { 888 /* this is a v3 query with v2 queriers present; 889 * Interpretation of the max_delay code is problematic here. 890 * A real v2 host would use ih_code directly, while v3 has a 891 * different encoding. We use the v3 encoding as more likely 892 * to be intended in a v3 query. 893 */ 894 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 895 } else { /* v3 */ 896 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 897 return; 898 899 ih3 = igmpv3_query_hdr(skb); 900 if (ih3->nsrcs) { 901 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 902 + ntohs(ih3->nsrcs)*sizeof(__be32))) 903 return; 904 ih3 = igmpv3_query_hdr(skb); 905 } 906 907 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 908 if (!max_delay) 909 max_delay = 1; /* can't mod w/ 0 */ 910 in_dev->mr_maxdelay = max_delay; 911 if (ih3->qrv) 912 in_dev->mr_qrv = ih3->qrv; 913 if (!group) { /* general query */ 914 if (ih3->nsrcs) 915 return; /* no sources allowed */ 916 igmp_gq_start_timer(in_dev); 917 return; 918 } 919 /* mark sources to include, if group & source-specific */ 920 mark = ih3->nsrcs != 0; 921 } 922 923 /* 924 * - Start the timers in all of our membership records 925 * that the query applies to for the interface on 926 * which the query arrived excl. those that belong 927 * to a "local" group (224.0.0.X) 928 * - For timers already running check if they need to 929 * be reset. 930 * - Use the igmp->igmp_code field as the maximum 931 * delay possible 932 */ 933 rcu_read_lock(); 934 for_each_pmc_rcu(in_dev, im) { 935 int changed; 936 937 if (group && group != im->multiaddr) 938 continue; 939 if (im->multiaddr == IGMP_ALL_HOSTS) 940 continue; 941 spin_lock_bh(&im->lock); 942 if (im->tm_running) 943 im->gsquery = im->gsquery && mark; 944 else 945 im->gsquery = mark; 946 changed = !im->gsquery || 947 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 948 spin_unlock_bh(&im->lock); 949 if (changed) 950 igmp_mod_timer(im, max_delay); 951 } 952 rcu_read_unlock(); 953 } 954 955 /* called in rcu_read_lock() section */ 956 int igmp_rcv(struct sk_buff *skb) 957 { 958 /* This basically follows the spec line by line -- see RFC1112 */ 959 struct igmphdr *ih; 960 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 961 int len = skb->len; 962 963 if (in_dev == NULL) 964 goto drop; 965 966 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 967 goto drop; 968 969 switch (skb->ip_summed) { 970 case CHECKSUM_COMPLETE: 971 if (!csum_fold(skb->csum)) 972 break; 973 /* fall through */ 974 case CHECKSUM_NONE: 975 skb->csum = 0; 976 if (__skb_checksum_complete(skb)) 977 goto drop; 978 } 979 980 ih = igmp_hdr(skb); 981 switch (ih->type) { 982 case IGMP_HOST_MEMBERSHIP_QUERY: 983 igmp_heard_query(in_dev, skb, len); 984 break; 985 case IGMP_HOST_MEMBERSHIP_REPORT: 986 case IGMPV2_HOST_MEMBERSHIP_REPORT: 987 /* Is it our report looped back? */ 988 if (rt_is_output_route(skb_rtable(skb))) 989 break; 990 /* don't rely on MC router hearing unicast reports */ 991 if (skb->pkt_type == PACKET_MULTICAST || 992 skb->pkt_type == PACKET_BROADCAST) 993 igmp_heard_report(in_dev, ih->group); 994 break; 995 case IGMP_PIM: 996 #ifdef CONFIG_IP_PIMSM_V1 997 return pim_rcv_v1(skb); 998 #endif 999 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1000 case IGMP_DVMRP: 1001 case IGMP_TRACE: 1002 case IGMP_HOST_LEAVE_MESSAGE: 1003 case IGMP_MTRACE: 1004 case IGMP_MTRACE_RESP: 1005 break; 1006 default: 1007 break; 1008 } 1009 1010 drop: 1011 kfree_skb(skb); 1012 return 0; 1013 } 1014 1015 #endif 1016 1017 1018 /* 1019 * Add a filter to a device 1020 */ 1021 1022 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1023 { 1024 char buf[MAX_ADDR_LEN]; 1025 struct net_device *dev = in_dev->dev; 1026 1027 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1028 We will get multicast token leakage, when IFF_MULTICAST 1029 is changed. This check should be done in dev->set_multicast_list 1030 routine. Something sort of: 1031 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1032 --ANK 1033 */ 1034 if (arp_mc_map(addr, buf, dev, 0) == 0) 1035 dev_mc_add(dev, buf); 1036 } 1037 1038 /* 1039 * Remove a filter from a device 1040 */ 1041 1042 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1043 { 1044 char buf[MAX_ADDR_LEN]; 1045 struct net_device *dev = in_dev->dev; 1046 1047 if (arp_mc_map(addr, buf, dev, 0) == 0) 1048 dev_mc_del(dev, buf); 1049 } 1050 1051 #ifdef CONFIG_IP_MULTICAST 1052 /* 1053 * deleted ip_mc_list manipulation 1054 */ 1055 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1056 { 1057 struct ip_mc_list *pmc; 1058 1059 /* this is an "ip_mc_list" for convenience; only the fields below 1060 * are actually used. In particular, the refcnt and users are not 1061 * used for management of the delete list. Using the same structure 1062 * for deleted items allows change reports to use common code with 1063 * non-deleted or query-response MCA's. 1064 */ 1065 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1066 if (!pmc) 1067 return; 1068 spin_lock_bh(&im->lock); 1069 pmc->interface = im->interface; 1070 in_dev_hold(in_dev); 1071 pmc->multiaddr = im->multiaddr; 1072 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1073 IGMP_Unsolicited_Report_Count; 1074 pmc->sfmode = im->sfmode; 1075 if (pmc->sfmode == MCAST_INCLUDE) { 1076 struct ip_sf_list *psf; 1077 1078 pmc->tomb = im->tomb; 1079 pmc->sources = im->sources; 1080 im->tomb = im->sources = NULL; 1081 for (psf=pmc->sources; psf; psf=psf->sf_next) 1082 psf->sf_crcount = pmc->crcount; 1083 } 1084 spin_unlock_bh(&im->lock); 1085 1086 spin_lock_bh(&in_dev->mc_tomb_lock); 1087 pmc->next = in_dev->mc_tomb; 1088 in_dev->mc_tomb = pmc; 1089 spin_unlock_bh(&in_dev->mc_tomb_lock); 1090 } 1091 1092 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1093 { 1094 struct ip_mc_list *pmc, *pmc_prev; 1095 struct ip_sf_list *psf, *psf_next; 1096 1097 spin_lock_bh(&in_dev->mc_tomb_lock); 1098 pmc_prev = NULL; 1099 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1100 if (pmc->multiaddr == multiaddr) 1101 break; 1102 pmc_prev = pmc; 1103 } 1104 if (pmc) { 1105 if (pmc_prev) 1106 pmc_prev->next = pmc->next; 1107 else 1108 in_dev->mc_tomb = pmc->next; 1109 } 1110 spin_unlock_bh(&in_dev->mc_tomb_lock); 1111 if (pmc) { 1112 for (psf=pmc->tomb; psf; psf=psf_next) { 1113 psf_next = psf->sf_next; 1114 kfree(psf); 1115 } 1116 in_dev_put(pmc->interface); 1117 kfree(pmc); 1118 } 1119 } 1120 1121 static void igmpv3_clear_delrec(struct in_device *in_dev) 1122 { 1123 struct ip_mc_list *pmc, *nextpmc; 1124 1125 spin_lock_bh(&in_dev->mc_tomb_lock); 1126 pmc = in_dev->mc_tomb; 1127 in_dev->mc_tomb = NULL; 1128 spin_unlock_bh(&in_dev->mc_tomb_lock); 1129 1130 for (; pmc; pmc = nextpmc) { 1131 nextpmc = pmc->next; 1132 ip_mc_clear_src(pmc); 1133 in_dev_put(pmc->interface); 1134 kfree(pmc); 1135 } 1136 /* clear dead sources, too */ 1137 rcu_read_lock(); 1138 for_each_pmc_rcu(in_dev, pmc) { 1139 struct ip_sf_list *psf, *psf_next; 1140 1141 spin_lock_bh(&pmc->lock); 1142 psf = pmc->tomb; 1143 pmc->tomb = NULL; 1144 spin_unlock_bh(&pmc->lock); 1145 for (; psf; psf=psf_next) { 1146 psf_next = psf->sf_next; 1147 kfree(psf); 1148 } 1149 } 1150 rcu_read_unlock(); 1151 } 1152 #endif 1153 1154 static void igmp_group_dropped(struct ip_mc_list *im) 1155 { 1156 struct in_device *in_dev = im->interface; 1157 #ifdef CONFIG_IP_MULTICAST 1158 int reporter; 1159 #endif 1160 1161 if (im->loaded) { 1162 im->loaded = 0; 1163 ip_mc_filter_del(in_dev, im->multiaddr); 1164 } 1165 1166 #ifdef CONFIG_IP_MULTICAST 1167 if (im->multiaddr == IGMP_ALL_HOSTS) 1168 return; 1169 1170 reporter = im->reporter; 1171 igmp_stop_timer(im); 1172 1173 if (!in_dev->dead) { 1174 if (IGMP_V1_SEEN(in_dev)) 1175 goto done; 1176 if (IGMP_V2_SEEN(in_dev)) { 1177 if (reporter) 1178 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1179 goto done; 1180 } 1181 /* IGMPv3 */ 1182 igmpv3_add_delrec(in_dev, im); 1183 1184 igmp_ifc_event(in_dev); 1185 } 1186 done: 1187 #endif 1188 ip_mc_clear_src(im); 1189 } 1190 1191 static void igmp_group_added(struct ip_mc_list *im) 1192 { 1193 struct in_device *in_dev = im->interface; 1194 1195 if (im->loaded == 0) { 1196 im->loaded = 1; 1197 ip_mc_filter_add(in_dev, im->multiaddr); 1198 } 1199 1200 #ifdef CONFIG_IP_MULTICAST 1201 if (im->multiaddr == IGMP_ALL_HOSTS) 1202 return; 1203 1204 if (in_dev->dead) 1205 return; 1206 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1207 spin_lock_bh(&im->lock); 1208 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1209 spin_unlock_bh(&im->lock); 1210 return; 1211 } 1212 /* else, v3 */ 1213 1214 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1215 IGMP_Unsolicited_Report_Count; 1216 igmp_ifc_event(in_dev); 1217 #endif 1218 } 1219 1220 1221 /* 1222 * Multicast list managers 1223 */ 1224 1225 1226 /* 1227 * A socket has joined a multicast group on device dev. 1228 */ 1229 1230 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1231 { 1232 struct ip_mc_list *im; 1233 1234 ASSERT_RTNL(); 1235 1236 for_each_pmc_rtnl(in_dev, im) { 1237 if (im->multiaddr == addr) { 1238 im->users++; 1239 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1240 goto out; 1241 } 1242 } 1243 1244 im = kzalloc(sizeof(*im), GFP_KERNEL); 1245 if (!im) 1246 goto out; 1247 1248 im->users = 1; 1249 im->interface = in_dev; 1250 in_dev_hold(in_dev); 1251 im->multiaddr = addr; 1252 /* initial mode is (EX, empty) */ 1253 im->sfmode = MCAST_EXCLUDE; 1254 im->sfcount[MCAST_EXCLUDE] = 1; 1255 atomic_set(&im->refcnt, 1); 1256 spin_lock_init(&im->lock); 1257 #ifdef CONFIG_IP_MULTICAST 1258 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1259 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1260 #endif 1261 1262 im->next_rcu = in_dev->mc_list; 1263 in_dev->mc_count++; 1264 rcu_assign_pointer(in_dev->mc_list, im); 1265 1266 #ifdef CONFIG_IP_MULTICAST 1267 igmpv3_del_delrec(in_dev, im->multiaddr); 1268 #endif 1269 igmp_group_added(im); 1270 if (!in_dev->dead) 1271 ip_rt_multicast_event(in_dev); 1272 out: 1273 return; 1274 } 1275 EXPORT_SYMBOL(ip_mc_inc_group); 1276 1277 /* 1278 * Resend IGMP JOIN report; used for bonding. 1279 * Called with rcu_read_lock() 1280 */ 1281 void ip_mc_rejoin_groups(struct in_device *in_dev) 1282 { 1283 #ifdef CONFIG_IP_MULTICAST 1284 struct ip_mc_list *im; 1285 int type; 1286 1287 for_each_pmc_rcu(in_dev, im) { 1288 if (im->multiaddr == IGMP_ALL_HOSTS) 1289 continue; 1290 1291 /* a failover is happening and switches 1292 * must be notified immediately 1293 */ 1294 if (IGMP_V1_SEEN(in_dev)) 1295 type = IGMP_HOST_MEMBERSHIP_REPORT; 1296 else if (IGMP_V2_SEEN(in_dev)) 1297 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1298 else 1299 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1300 igmp_send_report(in_dev, im, type); 1301 } 1302 #endif 1303 } 1304 EXPORT_SYMBOL(ip_mc_rejoin_groups); 1305 1306 /* 1307 * A socket has left a multicast group on device dev 1308 */ 1309 1310 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1311 { 1312 struct ip_mc_list *i; 1313 struct ip_mc_list __rcu **ip; 1314 1315 ASSERT_RTNL(); 1316 1317 for (ip = &in_dev->mc_list; 1318 (i = rtnl_dereference(*ip)) != NULL; 1319 ip = &i->next_rcu) { 1320 if (i->multiaddr == addr) { 1321 if (--i->users == 0) { 1322 *ip = i->next_rcu; 1323 in_dev->mc_count--; 1324 igmp_group_dropped(i); 1325 1326 if (!in_dev->dead) 1327 ip_rt_multicast_event(in_dev); 1328 1329 ip_ma_put(i); 1330 return; 1331 } 1332 break; 1333 } 1334 } 1335 } 1336 EXPORT_SYMBOL(ip_mc_dec_group); 1337 1338 /* Device changing type */ 1339 1340 void ip_mc_unmap(struct in_device *in_dev) 1341 { 1342 struct ip_mc_list *pmc; 1343 1344 ASSERT_RTNL(); 1345 1346 for_each_pmc_rtnl(in_dev, pmc) 1347 igmp_group_dropped(pmc); 1348 } 1349 1350 void ip_mc_remap(struct in_device *in_dev) 1351 { 1352 struct ip_mc_list *pmc; 1353 1354 ASSERT_RTNL(); 1355 1356 for_each_pmc_rtnl(in_dev, pmc) 1357 igmp_group_added(pmc); 1358 } 1359 1360 /* Device going down */ 1361 1362 void ip_mc_down(struct in_device *in_dev) 1363 { 1364 struct ip_mc_list *pmc; 1365 1366 ASSERT_RTNL(); 1367 1368 for_each_pmc_rtnl(in_dev, pmc) 1369 igmp_group_dropped(pmc); 1370 1371 #ifdef CONFIG_IP_MULTICAST 1372 in_dev->mr_ifc_count = 0; 1373 if (del_timer(&in_dev->mr_ifc_timer)) 1374 __in_dev_put(in_dev); 1375 in_dev->mr_gq_running = 0; 1376 if (del_timer(&in_dev->mr_gq_timer)) 1377 __in_dev_put(in_dev); 1378 igmpv3_clear_delrec(in_dev); 1379 #endif 1380 1381 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1382 } 1383 1384 void ip_mc_init_dev(struct in_device *in_dev) 1385 { 1386 ASSERT_RTNL(); 1387 1388 in_dev->mc_tomb = NULL; 1389 #ifdef CONFIG_IP_MULTICAST 1390 in_dev->mr_gq_running = 0; 1391 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1392 (unsigned long)in_dev); 1393 in_dev->mr_ifc_count = 0; 1394 in_dev->mc_count = 0; 1395 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1396 (unsigned long)in_dev); 1397 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1398 #endif 1399 1400 spin_lock_init(&in_dev->mc_tomb_lock); 1401 } 1402 1403 /* Device going up */ 1404 1405 void ip_mc_up(struct in_device *in_dev) 1406 { 1407 struct ip_mc_list *pmc; 1408 1409 ASSERT_RTNL(); 1410 1411 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1412 1413 for_each_pmc_rtnl(in_dev, pmc) 1414 igmp_group_added(pmc); 1415 } 1416 1417 /* 1418 * Device is about to be destroyed: clean up. 1419 */ 1420 1421 void ip_mc_destroy_dev(struct in_device *in_dev) 1422 { 1423 struct ip_mc_list *i; 1424 1425 ASSERT_RTNL(); 1426 1427 /* Deactivate timers */ 1428 ip_mc_down(in_dev); 1429 1430 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1431 in_dev->mc_list = i->next_rcu; 1432 in_dev->mc_count--; 1433 1434 igmp_group_dropped(i); 1435 ip_ma_put(i); 1436 } 1437 } 1438 1439 /* RTNL is locked */ 1440 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1441 { 1442 struct flowi fl = { .fl4_dst = imr->imr_multiaddr.s_addr }; 1443 struct rtable *rt; 1444 struct net_device *dev = NULL; 1445 struct in_device *idev = NULL; 1446 1447 if (imr->imr_ifindex) { 1448 idev = inetdev_by_index(net, imr->imr_ifindex); 1449 return idev; 1450 } 1451 if (imr->imr_address.s_addr) { 1452 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1453 if (!dev) 1454 return NULL; 1455 } 1456 1457 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1458 dev = rt->dst.dev; 1459 ip_rt_put(rt); 1460 } 1461 if (dev) { 1462 imr->imr_ifindex = dev->ifindex; 1463 idev = __in_dev_get_rtnl(dev); 1464 } 1465 return idev; 1466 } 1467 1468 /* 1469 * Join a socket to a group 1470 */ 1471 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1472 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1473 1474 1475 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1476 __be32 *psfsrc) 1477 { 1478 struct ip_sf_list *psf, *psf_prev; 1479 int rv = 0; 1480 1481 psf_prev = NULL; 1482 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1483 if (psf->sf_inaddr == *psfsrc) 1484 break; 1485 psf_prev = psf; 1486 } 1487 if (!psf || psf->sf_count[sfmode] == 0) { 1488 /* source filter not found, or count wrong => bug */ 1489 return -ESRCH; 1490 } 1491 psf->sf_count[sfmode]--; 1492 if (psf->sf_count[sfmode] == 0) { 1493 ip_rt_multicast_event(pmc->interface); 1494 } 1495 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1496 #ifdef CONFIG_IP_MULTICAST 1497 struct in_device *in_dev = pmc->interface; 1498 #endif 1499 1500 /* no more filters for this source */ 1501 if (psf_prev) 1502 psf_prev->sf_next = psf->sf_next; 1503 else 1504 pmc->sources = psf->sf_next; 1505 #ifdef CONFIG_IP_MULTICAST 1506 if (psf->sf_oldin && 1507 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1508 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1509 IGMP_Unsolicited_Report_Count; 1510 psf->sf_next = pmc->tomb; 1511 pmc->tomb = psf; 1512 rv = 1; 1513 } else 1514 #endif 1515 kfree(psf); 1516 } 1517 return rv; 1518 } 1519 1520 #ifndef CONFIG_IP_MULTICAST 1521 #define igmp_ifc_event(x) do { } while (0) 1522 #endif 1523 1524 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1525 int sfcount, __be32 *psfsrc, int delta) 1526 { 1527 struct ip_mc_list *pmc; 1528 int changerec = 0; 1529 int i, err; 1530 1531 if (!in_dev) 1532 return -ENODEV; 1533 rcu_read_lock(); 1534 for_each_pmc_rcu(in_dev, pmc) { 1535 if (*pmca == pmc->multiaddr) 1536 break; 1537 } 1538 if (!pmc) { 1539 /* MCA not found?? bug */ 1540 rcu_read_unlock(); 1541 return -ESRCH; 1542 } 1543 spin_lock_bh(&pmc->lock); 1544 rcu_read_unlock(); 1545 #ifdef CONFIG_IP_MULTICAST 1546 sf_markstate(pmc); 1547 #endif 1548 if (!delta) { 1549 err = -EINVAL; 1550 if (!pmc->sfcount[sfmode]) 1551 goto out_unlock; 1552 pmc->sfcount[sfmode]--; 1553 } 1554 err = 0; 1555 for (i=0; i<sfcount; i++) { 1556 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1557 1558 changerec |= rv > 0; 1559 if (!err && rv < 0) 1560 err = rv; 1561 } 1562 if (pmc->sfmode == MCAST_EXCLUDE && 1563 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1564 pmc->sfcount[MCAST_INCLUDE]) { 1565 #ifdef CONFIG_IP_MULTICAST 1566 struct ip_sf_list *psf; 1567 #endif 1568 1569 /* filter mode change */ 1570 pmc->sfmode = MCAST_INCLUDE; 1571 #ifdef CONFIG_IP_MULTICAST 1572 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1573 IGMP_Unsolicited_Report_Count; 1574 in_dev->mr_ifc_count = pmc->crcount; 1575 for (psf=pmc->sources; psf; psf = psf->sf_next) 1576 psf->sf_crcount = 0; 1577 igmp_ifc_event(pmc->interface); 1578 } else if (sf_setstate(pmc) || changerec) { 1579 igmp_ifc_event(pmc->interface); 1580 #endif 1581 } 1582 out_unlock: 1583 spin_unlock_bh(&pmc->lock); 1584 return err; 1585 } 1586 1587 /* 1588 * Add multicast single-source filter to the interface list 1589 */ 1590 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1591 __be32 *psfsrc, int delta) 1592 { 1593 struct ip_sf_list *psf, *psf_prev; 1594 1595 psf_prev = NULL; 1596 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1597 if (psf->sf_inaddr == *psfsrc) 1598 break; 1599 psf_prev = psf; 1600 } 1601 if (!psf) { 1602 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1603 if (!psf) 1604 return -ENOBUFS; 1605 psf->sf_inaddr = *psfsrc; 1606 if (psf_prev) { 1607 psf_prev->sf_next = psf; 1608 } else 1609 pmc->sources = psf; 1610 } 1611 psf->sf_count[sfmode]++; 1612 if (psf->sf_count[sfmode] == 1) { 1613 ip_rt_multicast_event(pmc->interface); 1614 } 1615 return 0; 1616 } 1617 1618 #ifdef CONFIG_IP_MULTICAST 1619 static void sf_markstate(struct ip_mc_list *pmc) 1620 { 1621 struct ip_sf_list *psf; 1622 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1623 1624 for (psf=pmc->sources; psf; psf=psf->sf_next) 1625 if (pmc->sfcount[MCAST_EXCLUDE]) { 1626 psf->sf_oldin = mca_xcount == 1627 psf->sf_count[MCAST_EXCLUDE] && 1628 !psf->sf_count[MCAST_INCLUDE]; 1629 } else 1630 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1631 } 1632 1633 static int sf_setstate(struct ip_mc_list *pmc) 1634 { 1635 struct ip_sf_list *psf, *dpsf; 1636 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1637 int qrv = pmc->interface->mr_qrv; 1638 int new_in, rv; 1639 1640 rv = 0; 1641 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1642 if (pmc->sfcount[MCAST_EXCLUDE]) { 1643 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1644 !psf->sf_count[MCAST_INCLUDE]; 1645 } else 1646 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1647 if (new_in) { 1648 if (!psf->sf_oldin) { 1649 struct ip_sf_list *prev = NULL; 1650 1651 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1652 if (dpsf->sf_inaddr == psf->sf_inaddr) 1653 break; 1654 prev = dpsf; 1655 } 1656 if (dpsf) { 1657 if (prev) 1658 prev->sf_next = dpsf->sf_next; 1659 else 1660 pmc->tomb = dpsf->sf_next; 1661 kfree(dpsf); 1662 } 1663 psf->sf_crcount = qrv; 1664 rv++; 1665 } 1666 } else if (psf->sf_oldin) { 1667 1668 psf->sf_crcount = 0; 1669 /* 1670 * add or update "delete" records if an active filter 1671 * is now inactive 1672 */ 1673 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1674 if (dpsf->sf_inaddr == psf->sf_inaddr) 1675 break; 1676 if (!dpsf) { 1677 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1678 if (!dpsf) 1679 continue; 1680 *dpsf = *psf; 1681 /* pmc->lock held by callers */ 1682 dpsf->sf_next = pmc->tomb; 1683 pmc->tomb = dpsf; 1684 } 1685 dpsf->sf_crcount = qrv; 1686 rv++; 1687 } 1688 } 1689 return rv; 1690 } 1691 #endif 1692 1693 /* 1694 * Add multicast source filter list to the interface list 1695 */ 1696 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1697 int sfcount, __be32 *psfsrc, int delta) 1698 { 1699 struct ip_mc_list *pmc; 1700 int isexclude; 1701 int i, err; 1702 1703 if (!in_dev) 1704 return -ENODEV; 1705 rcu_read_lock(); 1706 for_each_pmc_rcu(in_dev, pmc) { 1707 if (*pmca == pmc->multiaddr) 1708 break; 1709 } 1710 if (!pmc) { 1711 /* MCA not found?? bug */ 1712 rcu_read_unlock(); 1713 return -ESRCH; 1714 } 1715 spin_lock_bh(&pmc->lock); 1716 rcu_read_unlock(); 1717 1718 #ifdef CONFIG_IP_MULTICAST 1719 sf_markstate(pmc); 1720 #endif 1721 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1722 if (!delta) 1723 pmc->sfcount[sfmode]++; 1724 err = 0; 1725 for (i=0; i<sfcount; i++) { 1726 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1727 if (err) 1728 break; 1729 } 1730 if (err) { 1731 int j; 1732 1733 pmc->sfcount[sfmode]--; 1734 for (j=0; j<i; j++) 1735 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1736 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1737 #ifdef CONFIG_IP_MULTICAST 1738 struct ip_sf_list *psf; 1739 in_dev = pmc->interface; 1740 #endif 1741 1742 /* filter mode change */ 1743 if (pmc->sfcount[MCAST_EXCLUDE]) 1744 pmc->sfmode = MCAST_EXCLUDE; 1745 else if (pmc->sfcount[MCAST_INCLUDE]) 1746 pmc->sfmode = MCAST_INCLUDE; 1747 #ifdef CONFIG_IP_MULTICAST 1748 /* else no filters; keep old mode for reports */ 1749 1750 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1751 IGMP_Unsolicited_Report_Count; 1752 in_dev->mr_ifc_count = pmc->crcount; 1753 for (psf=pmc->sources; psf; psf = psf->sf_next) 1754 psf->sf_crcount = 0; 1755 igmp_ifc_event(in_dev); 1756 } else if (sf_setstate(pmc)) { 1757 igmp_ifc_event(in_dev); 1758 #endif 1759 } 1760 spin_unlock_bh(&pmc->lock); 1761 return err; 1762 } 1763 1764 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1765 { 1766 struct ip_sf_list *psf, *nextpsf; 1767 1768 for (psf=pmc->tomb; psf; psf=nextpsf) { 1769 nextpsf = psf->sf_next; 1770 kfree(psf); 1771 } 1772 pmc->tomb = NULL; 1773 for (psf=pmc->sources; psf; psf=nextpsf) { 1774 nextpsf = psf->sf_next; 1775 kfree(psf); 1776 } 1777 pmc->sources = NULL; 1778 pmc->sfmode = MCAST_EXCLUDE; 1779 pmc->sfcount[MCAST_INCLUDE] = 0; 1780 pmc->sfcount[MCAST_EXCLUDE] = 1; 1781 } 1782 1783 1784 /* 1785 * Join a multicast group 1786 */ 1787 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1788 { 1789 int err; 1790 __be32 addr = imr->imr_multiaddr.s_addr; 1791 struct ip_mc_socklist *iml = NULL, *i; 1792 struct in_device *in_dev; 1793 struct inet_sock *inet = inet_sk(sk); 1794 struct net *net = sock_net(sk); 1795 int ifindex; 1796 int count = 0; 1797 1798 if (!ipv4_is_multicast(addr)) 1799 return -EINVAL; 1800 1801 rtnl_lock(); 1802 1803 in_dev = ip_mc_find_dev(net, imr); 1804 1805 if (!in_dev) { 1806 iml = NULL; 1807 err = -ENODEV; 1808 goto done; 1809 } 1810 1811 err = -EADDRINUSE; 1812 ifindex = imr->imr_ifindex; 1813 for_each_pmc_rtnl(inet, i) { 1814 if (i->multi.imr_multiaddr.s_addr == addr && 1815 i->multi.imr_ifindex == ifindex) 1816 goto done; 1817 count++; 1818 } 1819 err = -ENOBUFS; 1820 if (count >= sysctl_igmp_max_memberships) 1821 goto done; 1822 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1823 if (iml == NULL) 1824 goto done; 1825 1826 memcpy(&iml->multi, imr, sizeof(*imr)); 1827 iml->next_rcu = inet->mc_list; 1828 iml->sflist = NULL; 1829 iml->sfmode = MCAST_EXCLUDE; 1830 rcu_assign_pointer(inet->mc_list, iml); 1831 ip_mc_inc_group(in_dev, addr); 1832 err = 0; 1833 done: 1834 rtnl_unlock(); 1835 return err; 1836 } 1837 EXPORT_SYMBOL(ip_mc_join_group); 1838 1839 static void ip_sf_socklist_reclaim(struct rcu_head *rp) 1840 { 1841 kfree(container_of(rp, struct ip_sf_socklist, rcu)); 1842 /* sk_omem_alloc should have been decreased by the caller*/ 1843 } 1844 1845 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1846 struct in_device *in_dev) 1847 { 1848 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1849 int err; 1850 1851 if (psf == NULL) { 1852 /* any-source empty exclude case */ 1853 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1854 iml->sfmode, 0, NULL, 0); 1855 } 1856 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1857 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1858 rcu_assign_pointer(iml->sflist, NULL); 1859 /* decrease mem now to avoid the memleak warning */ 1860 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1861 call_rcu(&psf->rcu, ip_sf_socklist_reclaim); 1862 return err; 1863 } 1864 1865 1866 static void ip_mc_socklist_reclaim(struct rcu_head *rp) 1867 { 1868 kfree(container_of(rp, struct ip_mc_socklist, rcu)); 1869 /* sk_omem_alloc should have been decreased by the caller*/ 1870 } 1871 1872 1873 /* 1874 * Ask a socket to leave a group. 1875 */ 1876 1877 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1878 { 1879 struct inet_sock *inet = inet_sk(sk); 1880 struct ip_mc_socklist *iml; 1881 struct ip_mc_socklist __rcu **imlp; 1882 struct in_device *in_dev; 1883 struct net *net = sock_net(sk); 1884 __be32 group = imr->imr_multiaddr.s_addr; 1885 u32 ifindex; 1886 int ret = -EADDRNOTAVAIL; 1887 1888 rtnl_lock(); 1889 in_dev = ip_mc_find_dev(net, imr); 1890 ifindex = imr->imr_ifindex; 1891 for (imlp = &inet->mc_list; 1892 (iml = rtnl_dereference(*imlp)) != NULL; 1893 imlp = &iml->next_rcu) { 1894 if (iml->multi.imr_multiaddr.s_addr != group) 1895 continue; 1896 if (ifindex) { 1897 if (iml->multi.imr_ifindex != ifindex) 1898 continue; 1899 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1900 iml->multi.imr_address.s_addr) 1901 continue; 1902 1903 (void) ip_mc_leave_src(sk, iml, in_dev); 1904 1905 *imlp = iml->next_rcu; 1906 1907 if (in_dev) 1908 ip_mc_dec_group(in_dev, group); 1909 rtnl_unlock(); 1910 /* decrease mem now to avoid the memleak warning */ 1911 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1912 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 1913 return 0; 1914 } 1915 if (!in_dev) 1916 ret = -ENODEV; 1917 rtnl_unlock(); 1918 return ret; 1919 } 1920 1921 int ip_mc_source(int add, int omode, struct sock *sk, struct 1922 ip_mreq_source *mreqs, int ifindex) 1923 { 1924 int err; 1925 struct ip_mreqn imr; 1926 __be32 addr = mreqs->imr_multiaddr; 1927 struct ip_mc_socklist *pmc; 1928 struct in_device *in_dev = NULL; 1929 struct inet_sock *inet = inet_sk(sk); 1930 struct ip_sf_socklist *psl; 1931 struct net *net = sock_net(sk); 1932 int leavegroup = 0; 1933 int i, j, rv; 1934 1935 if (!ipv4_is_multicast(addr)) 1936 return -EINVAL; 1937 1938 rtnl_lock(); 1939 1940 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1941 imr.imr_address.s_addr = mreqs->imr_interface; 1942 imr.imr_ifindex = ifindex; 1943 in_dev = ip_mc_find_dev(net, &imr); 1944 1945 if (!in_dev) { 1946 err = -ENODEV; 1947 goto done; 1948 } 1949 err = -EADDRNOTAVAIL; 1950 1951 for_each_pmc_rtnl(inet, pmc) { 1952 if ((pmc->multi.imr_multiaddr.s_addr == 1953 imr.imr_multiaddr.s_addr) && 1954 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1955 break; 1956 } 1957 if (!pmc) { /* must have a prior join */ 1958 err = -EINVAL; 1959 goto done; 1960 } 1961 /* if a source filter was set, must be the same mode as before */ 1962 if (pmc->sflist) { 1963 if (pmc->sfmode != omode) { 1964 err = -EINVAL; 1965 goto done; 1966 } 1967 } else if (pmc->sfmode != omode) { 1968 /* allow mode switches for empty-set filters */ 1969 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1970 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1971 NULL, 0); 1972 pmc->sfmode = omode; 1973 } 1974 1975 psl = rtnl_dereference(pmc->sflist); 1976 if (!add) { 1977 if (!psl) 1978 goto done; /* err = -EADDRNOTAVAIL */ 1979 rv = !0; 1980 for (i=0; i<psl->sl_count; i++) { 1981 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1982 sizeof(__be32)); 1983 if (rv == 0) 1984 break; 1985 } 1986 if (rv) /* source not found */ 1987 goto done; /* err = -EADDRNOTAVAIL */ 1988 1989 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1990 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1991 leavegroup = 1; 1992 goto done; 1993 } 1994 1995 /* update the interface filter */ 1996 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1997 &mreqs->imr_sourceaddr, 1); 1998 1999 for (j=i+1; j<psl->sl_count; j++) 2000 psl->sl_addr[j-1] = psl->sl_addr[j]; 2001 psl->sl_count--; 2002 err = 0; 2003 goto done; 2004 } 2005 /* else, add a new source to the filter */ 2006 2007 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 2008 err = -ENOBUFS; 2009 goto done; 2010 } 2011 if (!psl || psl->sl_count == psl->sl_max) { 2012 struct ip_sf_socklist *newpsl; 2013 int count = IP_SFBLOCK; 2014 2015 if (psl) 2016 count += psl->sl_max; 2017 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2018 if (!newpsl) { 2019 err = -ENOBUFS; 2020 goto done; 2021 } 2022 newpsl->sl_max = count; 2023 newpsl->sl_count = count - IP_SFBLOCK; 2024 if (psl) { 2025 for (i=0; i<psl->sl_count; i++) 2026 newpsl->sl_addr[i] = psl->sl_addr[i]; 2027 /* decrease mem now to avoid the memleak warning */ 2028 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2029 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2030 } 2031 rcu_assign_pointer(pmc->sflist, newpsl); 2032 psl = newpsl; 2033 } 2034 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2035 for (i=0; i<psl->sl_count; i++) { 2036 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2037 sizeof(__be32)); 2038 if (rv == 0) 2039 break; 2040 } 2041 if (rv == 0) /* address already there is an error */ 2042 goto done; 2043 for (j=psl->sl_count-1; j>=i; j--) 2044 psl->sl_addr[j+1] = psl->sl_addr[j]; 2045 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2046 psl->sl_count++; 2047 err = 0; 2048 /* update the interface list */ 2049 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2050 &mreqs->imr_sourceaddr, 1); 2051 done: 2052 rtnl_unlock(); 2053 if (leavegroup) 2054 return ip_mc_leave_group(sk, &imr); 2055 return err; 2056 } 2057 2058 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2059 { 2060 int err = 0; 2061 struct ip_mreqn imr; 2062 __be32 addr = msf->imsf_multiaddr; 2063 struct ip_mc_socklist *pmc; 2064 struct in_device *in_dev; 2065 struct inet_sock *inet = inet_sk(sk); 2066 struct ip_sf_socklist *newpsl, *psl; 2067 struct net *net = sock_net(sk); 2068 int leavegroup = 0; 2069 2070 if (!ipv4_is_multicast(addr)) 2071 return -EINVAL; 2072 if (msf->imsf_fmode != MCAST_INCLUDE && 2073 msf->imsf_fmode != MCAST_EXCLUDE) 2074 return -EINVAL; 2075 2076 rtnl_lock(); 2077 2078 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2079 imr.imr_address.s_addr = msf->imsf_interface; 2080 imr.imr_ifindex = ifindex; 2081 in_dev = ip_mc_find_dev(net, &imr); 2082 2083 if (!in_dev) { 2084 err = -ENODEV; 2085 goto done; 2086 } 2087 2088 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2089 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2090 leavegroup = 1; 2091 goto done; 2092 } 2093 2094 for_each_pmc_rtnl(inet, pmc) { 2095 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2096 pmc->multi.imr_ifindex == imr.imr_ifindex) 2097 break; 2098 } 2099 if (!pmc) { /* must have a prior join */ 2100 err = -EINVAL; 2101 goto done; 2102 } 2103 if (msf->imsf_numsrc) { 2104 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2105 GFP_KERNEL); 2106 if (!newpsl) { 2107 err = -ENOBUFS; 2108 goto done; 2109 } 2110 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2111 memcpy(newpsl->sl_addr, msf->imsf_slist, 2112 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2113 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2114 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2115 if (err) { 2116 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2117 goto done; 2118 } 2119 } else { 2120 newpsl = NULL; 2121 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2122 msf->imsf_fmode, 0, NULL, 0); 2123 } 2124 psl = rtnl_dereference(pmc->sflist); 2125 if (psl) { 2126 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2127 psl->sl_count, psl->sl_addr, 0); 2128 /* decrease mem now to avoid the memleak warning */ 2129 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2130 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2131 } else 2132 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2133 0, NULL, 0); 2134 rcu_assign_pointer(pmc->sflist, newpsl); 2135 pmc->sfmode = msf->imsf_fmode; 2136 err = 0; 2137 done: 2138 rtnl_unlock(); 2139 if (leavegroup) 2140 err = ip_mc_leave_group(sk, &imr); 2141 return err; 2142 } 2143 2144 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2145 struct ip_msfilter __user *optval, int __user *optlen) 2146 { 2147 int err, len, count, copycount; 2148 struct ip_mreqn imr; 2149 __be32 addr = msf->imsf_multiaddr; 2150 struct ip_mc_socklist *pmc; 2151 struct in_device *in_dev; 2152 struct inet_sock *inet = inet_sk(sk); 2153 struct ip_sf_socklist *psl; 2154 struct net *net = sock_net(sk); 2155 2156 if (!ipv4_is_multicast(addr)) 2157 return -EINVAL; 2158 2159 rtnl_lock(); 2160 2161 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2162 imr.imr_address.s_addr = msf->imsf_interface; 2163 imr.imr_ifindex = 0; 2164 in_dev = ip_mc_find_dev(net, &imr); 2165 2166 if (!in_dev) { 2167 err = -ENODEV; 2168 goto done; 2169 } 2170 err = -EADDRNOTAVAIL; 2171 2172 for_each_pmc_rtnl(inet, pmc) { 2173 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2174 pmc->multi.imr_ifindex == imr.imr_ifindex) 2175 break; 2176 } 2177 if (!pmc) /* must have a prior join */ 2178 goto done; 2179 msf->imsf_fmode = pmc->sfmode; 2180 psl = rtnl_dereference(pmc->sflist); 2181 rtnl_unlock(); 2182 if (!psl) { 2183 len = 0; 2184 count = 0; 2185 } else { 2186 count = psl->sl_count; 2187 } 2188 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2189 len = copycount * sizeof(psl->sl_addr[0]); 2190 msf->imsf_numsrc = count; 2191 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2192 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2193 return -EFAULT; 2194 } 2195 if (len && 2196 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2197 return -EFAULT; 2198 return 0; 2199 done: 2200 rtnl_unlock(); 2201 return err; 2202 } 2203 2204 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2205 struct group_filter __user *optval, int __user *optlen) 2206 { 2207 int err, i, count, copycount; 2208 struct sockaddr_in *psin; 2209 __be32 addr; 2210 struct ip_mc_socklist *pmc; 2211 struct inet_sock *inet = inet_sk(sk); 2212 struct ip_sf_socklist *psl; 2213 2214 psin = (struct sockaddr_in *)&gsf->gf_group; 2215 if (psin->sin_family != AF_INET) 2216 return -EINVAL; 2217 addr = psin->sin_addr.s_addr; 2218 if (!ipv4_is_multicast(addr)) 2219 return -EINVAL; 2220 2221 rtnl_lock(); 2222 2223 err = -EADDRNOTAVAIL; 2224 2225 for_each_pmc_rtnl(inet, pmc) { 2226 if (pmc->multi.imr_multiaddr.s_addr == addr && 2227 pmc->multi.imr_ifindex == gsf->gf_interface) 2228 break; 2229 } 2230 if (!pmc) /* must have a prior join */ 2231 goto done; 2232 gsf->gf_fmode = pmc->sfmode; 2233 psl = rtnl_dereference(pmc->sflist); 2234 rtnl_unlock(); 2235 count = psl ? psl->sl_count : 0; 2236 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2237 gsf->gf_numsrc = count; 2238 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2239 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2240 return -EFAULT; 2241 } 2242 for (i=0; i<copycount; i++) { 2243 struct sockaddr_storage ss; 2244 2245 psin = (struct sockaddr_in *)&ss; 2246 memset(&ss, 0, sizeof(ss)); 2247 psin->sin_family = AF_INET; 2248 psin->sin_addr.s_addr = psl->sl_addr[i]; 2249 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2250 return -EFAULT; 2251 } 2252 return 0; 2253 done: 2254 rtnl_unlock(); 2255 return err; 2256 } 2257 2258 /* 2259 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2260 */ 2261 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2262 { 2263 struct inet_sock *inet = inet_sk(sk); 2264 struct ip_mc_socklist *pmc; 2265 struct ip_sf_socklist *psl; 2266 int i; 2267 int ret; 2268 2269 ret = 1; 2270 if (!ipv4_is_multicast(loc_addr)) 2271 goto out; 2272 2273 rcu_read_lock(); 2274 for_each_pmc_rcu(inet, pmc) { 2275 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2276 pmc->multi.imr_ifindex == dif) 2277 break; 2278 } 2279 ret = inet->mc_all; 2280 if (!pmc) 2281 goto unlock; 2282 psl = rcu_dereference(pmc->sflist); 2283 ret = (pmc->sfmode == MCAST_EXCLUDE); 2284 if (!psl) 2285 goto unlock; 2286 2287 for (i=0; i<psl->sl_count; i++) { 2288 if (psl->sl_addr[i] == rmt_addr) 2289 break; 2290 } 2291 ret = 0; 2292 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2293 goto unlock; 2294 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2295 goto unlock; 2296 ret = 1; 2297 unlock: 2298 rcu_read_unlock(); 2299 out: 2300 return ret; 2301 } 2302 2303 /* 2304 * A socket is closing. 2305 */ 2306 2307 void ip_mc_drop_socket(struct sock *sk) 2308 { 2309 struct inet_sock *inet = inet_sk(sk); 2310 struct ip_mc_socklist *iml; 2311 struct net *net = sock_net(sk); 2312 2313 if (inet->mc_list == NULL) 2314 return; 2315 2316 rtnl_lock(); 2317 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2318 struct in_device *in_dev; 2319 2320 inet->mc_list = iml->next_rcu; 2321 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2322 (void) ip_mc_leave_src(sk, iml, in_dev); 2323 if (in_dev != NULL) 2324 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2325 /* decrease mem now to avoid the memleak warning */ 2326 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2327 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 2328 } 2329 rtnl_unlock(); 2330 } 2331 2332 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2333 { 2334 struct ip_mc_list *im; 2335 struct ip_sf_list *psf; 2336 int rv = 0; 2337 2338 rcu_read_lock(); 2339 for_each_pmc_rcu(in_dev, im) { 2340 if (im->multiaddr == mc_addr) 2341 break; 2342 } 2343 if (im && proto == IPPROTO_IGMP) { 2344 rv = 1; 2345 } else if (im) { 2346 if (src_addr) { 2347 for (psf=im->sources; psf; psf=psf->sf_next) { 2348 if (psf->sf_inaddr == src_addr) 2349 break; 2350 } 2351 if (psf) 2352 rv = psf->sf_count[MCAST_INCLUDE] || 2353 psf->sf_count[MCAST_EXCLUDE] != 2354 im->sfcount[MCAST_EXCLUDE]; 2355 else 2356 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2357 } else 2358 rv = 1; /* unspecified source; tentatively allow */ 2359 } 2360 rcu_read_unlock(); 2361 return rv; 2362 } 2363 2364 #if defined(CONFIG_PROC_FS) 2365 struct igmp_mc_iter_state { 2366 struct seq_net_private p; 2367 struct net_device *dev; 2368 struct in_device *in_dev; 2369 }; 2370 2371 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2372 2373 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2374 { 2375 struct net *net = seq_file_net(seq); 2376 struct ip_mc_list *im = NULL; 2377 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2378 2379 state->in_dev = NULL; 2380 for_each_netdev_rcu(net, state->dev) { 2381 struct in_device *in_dev; 2382 2383 in_dev = __in_dev_get_rcu(state->dev); 2384 if (!in_dev) 2385 continue; 2386 im = rcu_dereference(in_dev->mc_list); 2387 if (im) { 2388 state->in_dev = in_dev; 2389 break; 2390 } 2391 } 2392 return im; 2393 } 2394 2395 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2396 { 2397 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2398 2399 im = rcu_dereference(im->next_rcu); 2400 while (!im) { 2401 state->dev = next_net_device_rcu(state->dev); 2402 if (!state->dev) { 2403 state->in_dev = NULL; 2404 break; 2405 } 2406 state->in_dev = __in_dev_get_rcu(state->dev); 2407 if (!state->in_dev) 2408 continue; 2409 im = rcu_dereference(state->in_dev->mc_list); 2410 } 2411 return im; 2412 } 2413 2414 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2415 { 2416 struct ip_mc_list *im = igmp_mc_get_first(seq); 2417 if (im) 2418 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2419 --pos; 2420 return pos ? NULL : im; 2421 } 2422 2423 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2424 __acquires(rcu) 2425 { 2426 rcu_read_lock(); 2427 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2428 } 2429 2430 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2431 { 2432 struct ip_mc_list *im; 2433 if (v == SEQ_START_TOKEN) 2434 im = igmp_mc_get_first(seq); 2435 else 2436 im = igmp_mc_get_next(seq, v); 2437 ++*pos; 2438 return im; 2439 } 2440 2441 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2442 __releases(rcu) 2443 { 2444 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2445 2446 state->in_dev = NULL; 2447 state->dev = NULL; 2448 rcu_read_unlock(); 2449 } 2450 2451 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2452 { 2453 if (v == SEQ_START_TOKEN) 2454 seq_puts(seq, 2455 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2456 else { 2457 struct ip_mc_list *im = (struct ip_mc_list *)v; 2458 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2459 char *querier; 2460 #ifdef CONFIG_IP_MULTICAST 2461 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2462 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2463 "V3"; 2464 #else 2465 querier = "NONE"; 2466 #endif 2467 2468 if (rcu_dereference(state->in_dev->mc_list) == im) { 2469 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2470 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2471 } 2472 2473 seq_printf(seq, 2474 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2475 im->multiaddr, im->users, 2476 im->tm_running, im->tm_running ? 2477 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2478 im->reporter); 2479 } 2480 return 0; 2481 } 2482 2483 static const struct seq_operations igmp_mc_seq_ops = { 2484 .start = igmp_mc_seq_start, 2485 .next = igmp_mc_seq_next, 2486 .stop = igmp_mc_seq_stop, 2487 .show = igmp_mc_seq_show, 2488 }; 2489 2490 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2491 { 2492 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2493 sizeof(struct igmp_mc_iter_state)); 2494 } 2495 2496 static const struct file_operations igmp_mc_seq_fops = { 2497 .owner = THIS_MODULE, 2498 .open = igmp_mc_seq_open, 2499 .read = seq_read, 2500 .llseek = seq_lseek, 2501 .release = seq_release_net, 2502 }; 2503 2504 struct igmp_mcf_iter_state { 2505 struct seq_net_private p; 2506 struct net_device *dev; 2507 struct in_device *idev; 2508 struct ip_mc_list *im; 2509 }; 2510 2511 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2512 2513 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2514 { 2515 struct net *net = seq_file_net(seq); 2516 struct ip_sf_list *psf = NULL; 2517 struct ip_mc_list *im = NULL; 2518 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2519 2520 state->idev = NULL; 2521 state->im = NULL; 2522 for_each_netdev_rcu(net, state->dev) { 2523 struct in_device *idev; 2524 idev = __in_dev_get_rcu(state->dev); 2525 if (unlikely(idev == NULL)) 2526 continue; 2527 im = rcu_dereference(idev->mc_list); 2528 if (likely(im != NULL)) { 2529 spin_lock_bh(&im->lock); 2530 psf = im->sources; 2531 if (likely(psf != NULL)) { 2532 state->im = im; 2533 state->idev = idev; 2534 break; 2535 } 2536 spin_unlock_bh(&im->lock); 2537 } 2538 } 2539 return psf; 2540 } 2541 2542 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2543 { 2544 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2545 2546 psf = psf->sf_next; 2547 while (!psf) { 2548 spin_unlock_bh(&state->im->lock); 2549 state->im = state->im->next; 2550 while (!state->im) { 2551 state->dev = next_net_device_rcu(state->dev); 2552 if (!state->dev) { 2553 state->idev = NULL; 2554 goto out; 2555 } 2556 state->idev = __in_dev_get_rcu(state->dev); 2557 if (!state->idev) 2558 continue; 2559 state->im = rcu_dereference(state->idev->mc_list); 2560 } 2561 if (!state->im) 2562 break; 2563 spin_lock_bh(&state->im->lock); 2564 psf = state->im->sources; 2565 } 2566 out: 2567 return psf; 2568 } 2569 2570 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2571 { 2572 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2573 if (psf) 2574 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2575 --pos; 2576 return pos ? NULL : psf; 2577 } 2578 2579 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2580 __acquires(rcu) 2581 { 2582 rcu_read_lock(); 2583 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2584 } 2585 2586 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2587 { 2588 struct ip_sf_list *psf; 2589 if (v == SEQ_START_TOKEN) 2590 psf = igmp_mcf_get_first(seq); 2591 else 2592 psf = igmp_mcf_get_next(seq, v); 2593 ++*pos; 2594 return psf; 2595 } 2596 2597 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2598 __releases(rcu) 2599 { 2600 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2601 if (likely(state->im != NULL)) { 2602 spin_unlock_bh(&state->im->lock); 2603 state->im = NULL; 2604 } 2605 state->idev = NULL; 2606 state->dev = NULL; 2607 rcu_read_unlock(); 2608 } 2609 2610 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2611 { 2612 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2613 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2614 2615 if (v == SEQ_START_TOKEN) { 2616 seq_printf(seq, 2617 "%3s %6s " 2618 "%10s %10s %6s %6s\n", "Idx", 2619 "Device", "MCA", 2620 "SRC", "INC", "EXC"); 2621 } else { 2622 seq_printf(seq, 2623 "%3d %6.6s 0x%08x " 2624 "0x%08x %6lu %6lu\n", 2625 state->dev->ifindex, state->dev->name, 2626 ntohl(state->im->multiaddr), 2627 ntohl(psf->sf_inaddr), 2628 psf->sf_count[MCAST_INCLUDE], 2629 psf->sf_count[MCAST_EXCLUDE]); 2630 } 2631 return 0; 2632 } 2633 2634 static const struct seq_operations igmp_mcf_seq_ops = { 2635 .start = igmp_mcf_seq_start, 2636 .next = igmp_mcf_seq_next, 2637 .stop = igmp_mcf_seq_stop, 2638 .show = igmp_mcf_seq_show, 2639 }; 2640 2641 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2642 { 2643 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2644 sizeof(struct igmp_mcf_iter_state)); 2645 } 2646 2647 static const struct file_operations igmp_mcf_seq_fops = { 2648 .owner = THIS_MODULE, 2649 .open = igmp_mcf_seq_open, 2650 .read = seq_read, 2651 .llseek = seq_lseek, 2652 .release = seq_release_net, 2653 }; 2654 2655 static int __net_init igmp_net_init(struct net *net) 2656 { 2657 struct proc_dir_entry *pde; 2658 2659 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2660 if (!pde) 2661 goto out_igmp; 2662 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2663 if (!pde) 2664 goto out_mcfilter; 2665 return 0; 2666 2667 out_mcfilter: 2668 proc_net_remove(net, "igmp"); 2669 out_igmp: 2670 return -ENOMEM; 2671 } 2672 2673 static void __net_exit igmp_net_exit(struct net *net) 2674 { 2675 proc_net_remove(net, "mcfilter"); 2676 proc_net_remove(net, "igmp"); 2677 } 2678 2679 static struct pernet_operations igmp_net_ops = { 2680 .init = igmp_net_init, 2681 .exit = igmp_net_exit, 2682 }; 2683 2684 int __init igmp_mc_proc_init(void) 2685 { 2686 return register_pernet_subsys(&igmp_net_ops); 2687 } 2688 #endif 2689