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 <linux/types.h> 77 #include <linux/kernel.h> 78 #include <linux/jiffies.h> 79 #include <linux/string.h> 80 #include <linux/socket.h> 81 #include <linux/sockios.h> 82 #include <linux/in.h> 83 #include <linux/inet.h> 84 #include <linux/netdevice.h> 85 #include <linux/skbuff.h> 86 #include <linux/inetdevice.h> 87 #include <linux/igmp.h> 88 #include <linux/if_arp.h> 89 #include <linux/rtnetlink.h> 90 #include <linux/times.h> 91 #include <linux/pkt_sched.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_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) 118 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) 119 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) 120 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 121 122 123 #define IGMP_INITIAL_REPORT_DELAY (1) 124 125 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! 126 * IGMP specs require to report membership immediately after 127 * joining a group, but we delay the first report by a 128 * small interval. It seems more natural and still does not 129 * contradict to specs provided this delay is small enough. 130 */ 131 132 #define IGMP_V1_SEEN(in_dev) \ 133 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 135 ((in_dev)->mr_v1_seen && \ 136 time_before(jiffies, (in_dev)->mr_v1_seen))) 137 #define IGMP_V2_SEEN(in_dev) \ 138 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 140 ((in_dev)->mr_v2_seen && \ 141 time_before(jiffies, (in_dev)->mr_v2_seen))) 142 143 static int unsolicited_report_interval(struct in_device *in_dev) 144 { 145 int interval_ms, interval_jiffies; 146 147 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 148 interval_ms = IN_DEV_CONF_GET( 149 in_dev, 150 IGMPV2_UNSOLICITED_REPORT_INTERVAL); 151 else /* v3 */ 152 interval_ms = IN_DEV_CONF_GET( 153 in_dev, 154 IGMPV3_UNSOLICITED_REPORT_INTERVAL); 155 156 interval_jiffies = msecs_to_jiffies(interval_ms); 157 158 /* _timer functions can't handle a delay of 0 jiffies so ensure 159 * we always return a positive value. 160 */ 161 if (interval_jiffies <= 0) 162 interval_jiffies = 1; 163 return interval_jiffies; 164 } 165 166 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 167 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 168 static void igmpv3_clear_delrec(struct in_device *in_dev); 169 static int sf_setstate(struct ip_mc_list *pmc); 170 static void sf_markstate(struct ip_mc_list *pmc); 171 #endif 172 static void ip_mc_clear_src(struct ip_mc_list *pmc); 173 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 174 int sfcount, __be32 *psfsrc, int delta); 175 176 static void ip_ma_put(struct ip_mc_list *im) 177 { 178 if (atomic_dec_and_test(&im->refcnt)) { 179 in_dev_put(im->interface); 180 kfree_rcu(im, rcu); 181 } 182 } 183 184 #define for_each_pmc_rcu(in_dev, pmc) \ 185 for (pmc = rcu_dereference(in_dev->mc_list); \ 186 pmc != NULL; \ 187 pmc = rcu_dereference(pmc->next_rcu)) 188 189 #define for_each_pmc_rtnl(in_dev, pmc) \ 190 for (pmc = rtnl_dereference(in_dev->mc_list); \ 191 pmc != NULL; \ 192 pmc = rtnl_dereference(pmc->next_rcu)) 193 194 #ifdef CONFIG_IP_MULTICAST 195 196 /* 197 * Timer management 198 */ 199 200 static void igmp_stop_timer(struct ip_mc_list *im) 201 { 202 spin_lock_bh(&im->lock); 203 if (del_timer(&im->timer)) 204 atomic_dec(&im->refcnt); 205 im->tm_running = 0; 206 im->reporter = 0; 207 im->unsolicit_count = 0; 208 spin_unlock_bh(&im->lock); 209 } 210 211 /* It must be called with locked im->lock */ 212 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 213 { 214 int tv = prandom_u32() % max_delay; 215 216 im->tm_running = 1; 217 if (!mod_timer(&im->timer, jiffies+tv+2)) 218 atomic_inc(&im->refcnt); 219 } 220 221 static void igmp_gq_start_timer(struct in_device *in_dev) 222 { 223 int tv = prandom_u32() % in_dev->mr_maxdelay; 224 225 in_dev->mr_gq_running = 1; 226 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 227 in_dev_hold(in_dev); 228 } 229 230 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 231 { 232 int tv = prandom_u32() % delay; 233 234 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 235 in_dev_hold(in_dev); 236 } 237 238 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 239 { 240 spin_lock_bh(&im->lock); 241 im->unsolicit_count = 0; 242 if (del_timer(&im->timer)) { 243 if ((long)(im->timer.expires-jiffies) < max_delay) { 244 add_timer(&im->timer); 245 im->tm_running = 1; 246 spin_unlock_bh(&im->lock); 247 return; 248 } 249 atomic_dec(&im->refcnt); 250 } 251 igmp_start_timer(im, max_delay); 252 spin_unlock_bh(&im->lock); 253 } 254 255 256 /* 257 * Send an IGMP report. 258 */ 259 260 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 261 262 263 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 264 int gdeleted, int sdeleted) 265 { 266 switch (type) { 267 case IGMPV3_MODE_IS_INCLUDE: 268 case IGMPV3_MODE_IS_EXCLUDE: 269 if (gdeleted || sdeleted) 270 return 0; 271 if (!(pmc->gsquery && !psf->sf_gsresp)) { 272 if (pmc->sfmode == MCAST_INCLUDE) 273 return 1; 274 /* don't include if this source is excluded 275 * in all filters 276 */ 277 if (psf->sf_count[MCAST_INCLUDE]) 278 return type == IGMPV3_MODE_IS_INCLUDE; 279 return pmc->sfcount[MCAST_EXCLUDE] == 280 psf->sf_count[MCAST_EXCLUDE]; 281 } 282 return 0; 283 case IGMPV3_CHANGE_TO_INCLUDE: 284 if (gdeleted || sdeleted) 285 return 0; 286 return psf->sf_count[MCAST_INCLUDE] != 0; 287 case IGMPV3_CHANGE_TO_EXCLUDE: 288 if (gdeleted || sdeleted) 289 return 0; 290 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 291 psf->sf_count[MCAST_INCLUDE]) 292 return 0; 293 return pmc->sfcount[MCAST_EXCLUDE] == 294 psf->sf_count[MCAST_EXCLUDE]; 295 case IGMPV3_ALLOW_NEW_SOURCES: 296 if (gdeleted || !psf->sf_crcount) 297 return 0; 298 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 299 case IGMPV3_BLOCK_OLD_SOURCES: 300 if (pmc->sfmode == MCAST_INCLUDE) 301 return gdeleted || (psf->sf_crcount && sdeleted); 302 return psf->sf_crcount && !gdeleted && !sdeleted; 303 } 304 return 0; 305 } 306 307 static int 308 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 309 { 310 struct ip_sf_list *psf; 311 int scount = 0; 312 313 for (psf = pmc->sources; psf; psf = psf->sf_next) { 314 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 315 continue; 316 scount++; 317 } 318 return scount; 319 } 320 321 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) 322 { 323 struct sk_buff *skb; 324 struct rtable *rt; 325 struct iphdr *pip; 326 struct igmpv3_report *pig; 327 struct net *net = dev_net(dev); 328 struct flowi4 fl4; 329 int hlen = LL_RESERVED_SPACE(dev); 330 int tlen = dev->needed_tailroom; 331 unsigned int size = mtu; 332 333 while (1) { 334 skb = alloc_skb(size + hlen + tlen, 335 GFP_ATOMIC | __GFP_NOWARN); 336 if (skb) 337 break; 338 size >>= 1; 339 if (size < 256) 340 return NULL; 341 } 342 skb->priority = TC_PRIO_CONTROL; 343 344 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 345 0, 0, 346 IPPROTO_IGMP, 0, dev->ifindex); 347 if (IS_ERR(rt)) { 348 kfree_skb(skb); 349 return NULL; 350 } 351 352 skb_dst_set(skb, &rt->dst); 353 skb->dev = dev; 354 355 skb->reserved_tailroom = skb_end_offset(skb) - 356 min(mtu, skb_end_offset(skb)); 357 skb_reserve(skb, hlen); 358 359 skb_reset_network_header(skb); 360 pip = ip_hdr(skb); 361 skb_put(skb, sizeof(struct iphdr) + 4); 362 363 pip->version = 4; 364 pip->ihl = (sizeof(struct iphdr)+4)>>2; 365 pip->tos = 0xc0; 366 pip->frag_off = htons(IP_DF); 367 pip->ttl = 1; 368 pip->daddr = fl4.daddr; 369 pip->saddr = fl4.saddr; 370 pip->protocol = IPPROTO_IGMP; 371 pip->tot_len = 0; /* filled in later */ 372 ip_select_ident(skb, NULL); 373 ((u8 *)&pip[1])[0] = IPOPT_RA; 374 ((u8 *)&pip[1])[1] = 4; 375 ((u8 *)&pip[1])[2] = 0; 376 ((u8 *)&pip[1])[3] = 0; 377 378 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 379 skb_put(skb, sizeof(*pig)); 380 pig = igmpv3_report_hdr(skb); 381 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 382 pig->resv1 = 0; 383 pig->csum = 0; 384 pig->resv2 = 0; 385 pig->ngrec = 0; 386 return skb; 387 } 388 389 static int igmpv3_sendpack(struct sk_buff *skb) 390 { 391 struct igmphdr *pig = igmp_hdr(skb); 392 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); 393 394 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 395 396 return ip_local_out(skb); 397 } 398 399 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 400 { 401 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 402 } 403 404 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 405 int type, struct igmpv3_grec **ppgr) 406 { 407 struct net_device *dev = pmc->interface->dev; 408 struct igmpv3_report *pih; 409 struct igmpv3_grec *pgr; 410 411 if (!skb) 412 skb = igmpv3_newpack(dev, dev->mtu); 413 if (!skb) 414 return NULL; 415 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 416 pgr->grec_type = type; 417 pgr->grec_auxwords = 0; 418 pgr->grec_nsrcs = 0; 419 pgr->grec_mca = pmc->multiaddr; 420 pih = igmpv3_report_hdr(skb); 421 pih->ngrec = htons(ntohs(pih->ngrec)+1); 422 *ppgr = pgr; 423 return skb; 424 } 425 426 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) 427 428 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 429 int type, int gdeleted, int sdeleted) 430 { 431 struct net_device *dev = pmc->interface->dev; 432 struct igmpv3_report *pih; 433 struct igmpv3_grec *pgr = NULL; 434 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 435 int scount, stotal, first, isquery, truncate; 436 437 if (pmc->multiaddr == IGMP_ALL_HOSTS) 438 return skb; 439 440 isquery = type == IGMPV3_MODE_IS_INCLUDE || 441 type == IGMPV3_MODE_IS_EXCLUDE; 442 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 443 type == IGMPV3_CHANGE_TO_EXCLUDE; 444 445 stotal = scount = 0; 446 447 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 448 449 if (!*psf_list) 450 goto empty_source; 451 452 pih = skb ? igmpv3_report_hdr(skb) : NULL; 453 454 /* EX and TO_EX get a fresh packet, if needed */ 455 if (truncate) { 456 if (pih && pih->ngrec && 457 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 458 if (skb) 459 igmpv3_sendpack(skb); 460 skb = igmpv3_newpack(dev, dev->mtu); 461 } 462 } 463 first = 1; 464 psf_prev = NULL; 465 for (psf = *psf_list; psf; psf = psf_next) { 466 __be32 *psrc; 467 468 psf_next = psf->sf_next; 469 470 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 471 psf_prev = psf; 472 continue; 473 } 474 475 /* clear marks on query responses */ 476 if (isquery) 477 psf->sf_gsresp = 0; 478 479 if (AVAILABLE(skb) < sizeof(__be32) + 480 first*sizeof(struct igmpv3_grec)) { 481 if (truncate && !first) 482 break; /* truncate these */ 483 if (pgr) 484 pgr->grec_nsrcs = htons(scount); 485 if (skb) 486 igmpv3_sendpack(skb); 487 skb = igmpv3_newpack(dev, dev->mtu); 488 first = 1; 489 scount = 0; 490 } 491 if (first) { 492 skb = add_grhead(skb, pmc, type, &pgr); 493 first = 0; 494 } 495 if (!skb) 496 return NULL; 497 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 498 *psrc = psf->sf_inaddr; 499 scount++; stotal++; 500 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 501 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 502 psf->sf_crcount--; 503 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 504 if (psf_prev) 505 psf_prev->sf_next = psf->sf_next; 506 else 507 *psf_list = psf->sf_next; 508 kfree(psf); 509 continue; 510 } 511 } 512 psf_prev = psf; 513 } 514 515 empty_source: 516 if (!stotal) { 517 if (type == IGMPV3_ALLOW_NEW_SOURCES || 518 type == IGMPV3_BLOCK_OLD_SOURCES) 519 return skb; 520 if (pmc->crcount || isquery) { 521 /* make sure we have room for group header */ 522 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { 523 igmpv3_sendpack(skb); 524 skb = NULL; /* add_grhead will get a new one */ 525 } 526 skb = add_grhead(skb, pmc, type, &pgr); 527 } 528 } 529 if (pgr) 530 pgr->grec_nsrcs = htons(scount); 531 532 if (isquery) 533 pmc->gsquery = 0; /* clear query state on report */ 534 return skb; 535 } 536 537 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 538 { 539 struct sk_buff *skb = NULL; 540 int type; 541 542 if (!pmc) { 543 rcu_read_lock(); 544 for_each_pmc_rcu(in_dev, pmc) { 545 if (pmc->multiaddr == IGMP_ALL_HOSTS) 546 continue; 547 spin_lock_bh(&pmc->lock); 548 if (pmc->sfcount[MCAST_EXCLUDE]) 549 type = IGMPV3_MODE_IS_EXCLUDE; 550 else 551 type = IGMPV3_MODE_IS_INCLUDE; 552 skb = add_grec(skb, pmc, type, 0, 0); 553 spin_unlock_bh(&pmc->lock); 554 } 555 rcu_read_unlock(); 556 } else { 557 spin_lock_bh(&pmc->lock); 558 if (pmc->sfcount[MCAST_EXCLUDE]) 559 type = IGMPV3_MODE_IS_EXCLUDE; 560 else 561 type = IGMPV3_MODE_IS_INCLUDE; 562 skb = add_grec(skb, pmc, type, 0, 0); 563 spin_unlock_bh(&pmc->lock); 564 } 565 if (!skb) 566 return 0; 567 return igmpv3_sendpack(skb); 568 } 569 570 /* 571 * remove zero-count source records from a source filter list 572 */ 573 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 574 { 575 struct ip_sf_list *psf_prev, *psf_next, *psf; 576 577 psf_prev = NULL; 578 for (psf = *ppsf; psf; psf = psf_next) { 579 psf_next = psf->sf_next; 580 if (psf->sf_crcount == 0) { 581 if (psf_prev) 582 psf_prev->sf_next = psf->sf_next; 583 else 584 *ppsf = psf->sf_next; 585 kfree(psf); 586 } else 587 psf_prev = psf; 588 } 589 } 590 591 static void igmpv3_send_cr(struct in_device *in_dev) 592 { 593 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 594 struct sk_buff *skb = NULL; 595 int type, dtype; 596 597 rcu_read_lock(); 598 spin_lock_bh(&in_dev->mc_tomb_lock); 599 600 /* deleted MCA's */ 601 pmc_prev = NULL; 602 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { 603 pmc_next = pmc->next; 604 if (pmc->sfmode == MCAST_INCLUDE) { 605 type = IGMPV3_BLOCK_OLD_SOURCES; 606 dtype = IGMPV3_BLOCK_OLD_SOURCES; 607 skb = add_grec(skb, pmc, type, 1, 0); 608 skb = add_grec(skb, pmc, dtype, 1, 1); 609 } 610 if (pmc->crcount) { 611 if (pmc->sfmode == MCAST_EXCLUDE) { 612 type = IGMPV3_CHANGE_TO_INCLUDE; 613 skb = add_grec(skb, pmc, type, 1, 0); 614 } 615 pmc->crcount--; 616 if (pmc->crcount == 0) { 617 igmpv3_clear_zeros(&pmc->tomb); 618 igmpv3_clear_zeros(&pmc->sources); 619 } 620 } 621 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 622 if (pmc_prev) 623 pmc_prev->next = pmc_next; 624 else 625 in_dev->mc_tomb = pmc_next; 626 in_dev_put(pmc->interface); 627 kfree(pmc); 628 } else 629 pmc_prev = pmc; 630 } 631 spin_unlock_bh(&in_dev->mc_tomb_lock); 632 633 /* change recs */ 634 for_each_pmc_rcu(in_dev, pmc) { 635 spin_lock_bh(&pmc->lock); 636 if (pmc->sfcount[MCAST_EXCLUDE]) { 637 type = IGMPV3_BLOCK_OLD_SOURCES; 638 dtype = IGMPV3_ALLOW_NEW_SOURCES; 639 } else { 640 type = IGMPV3_ALLOW_NEW_SOURCES; 641 dtype = IGMPV3_BLOCK_OLD_SOURCES; 642 } 643 skb = add_grec(skb, pmc, type, 0, 0); 644 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 645 646 /* filter mode changes */ 647 if (pmc->crcount) { 648 if (pmc->sfmode == MCAST_EXCLUDE) 649 type = IGMPV3_CHANGE_TO_EXCLUDE; 650 else 651 type = IGMPV3_CHANGE_TO_INCLUDE; 652 skb = add_grec(skb, pmc, type, 0, 0); 653 pmc->crcount--; 654 } 655 spin_unlock_bh(&pmc->lock); 656 } 657 rcu_read_unlock(); 658 659 if (!skb) 660 return; 661 (void) igmpv3_sendpack(skb); 662 } 663 664 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 665 int type) 666 { 667 struct sk_buff *skb; 668 struct iphdr *iph; 669 struct igmphdr *ih; 670 struct rtable *rt; 671 struct net_device *dev = in_dev->dev; 672 struct net *net = dev_net(dev); 673 __be32 group = pmc ? pmc->multiaddr : 0; 674 struct flowi4 fl4; 675 __be32 dst; 676 int hlen, tlen; 677 678 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 679 return igmpv3_send_report(in_dev, pmc); 680 else if (type == IGMP_HOST_LEAVE_MESSAGE) 681 dst = IGMP_ALL_ROUTER; 682 else 683 dst = group; 684 685 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 686 0, 0, 687 IPPROTO_IGMP, 0, dev->ifindex); 688 if (IS_ERR(rt)) 689 return -1; 690 691 hlen = LL_RESERVED_SPACE(dev); 692 tlen = dev->needed_tailroom; 693 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 694 if (skb == NULL) { 695 ip_rt_put(rt); 696 return -1; 697 } 698 skb->priority = TC_PRIO_CONTROL; 699 700 skb_dst_set(skb, &rt->dst); 701 702 skb_reserve(skb, hlen); 703 704 skb_reset_network_header(skb); 705 iph = ip_hdr(skb); 706 skb_put(skb, sizeof(struct iphdr) + 4); 707 708 iph->version = 4; 709 iph->ihl = (sizeof(struct iphdr)+4)>>2; 710 iph->tos = 0xc0; 711 iph->frag_off = htons(IP_DF); 712 iph->ttl = 1; 713 iph->daddr = dst; 714 iph->saddr = fl4.saddr; 715 iph->protocol = IPPROTO_IGMP; 716 ip_select_ident(skb, NULL); 717 ((u8 *)&iph[1])[0] = IPOPT_RA; 718 ((u8 *)&iph[1])[1] = 4; 719 ((u8 *)&iph[1])[2] = 0; 720 ((u8 *)&iph[1])[3] = 0; 721 722 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 723 ih->type = type; 724 ih->code = 0; 725 ih->csum = 0; 726 ih->group = group; 727 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 728 729 return ip_local_out(skb); 730 } 731 732 static void igmp_gq_timer_expire(unsigned long data) 733 { 734 struct in_device *in_dev = (struct in_device *)data; 735 736 in_dev->mr_gq_running = 0; 737 igmpv3_send_report(in_dev, NULL); 738 in_dev_put(in_dev); 739 } 740 741 static void igmp_ifc_timer_expire(unsigned long data) 742 { 743 struct in_device *in_dev = (struct in_device *)data; 744 745 igmpv3_send_cr(in_dev); 746 if (in_dev->mr_ifc_count) { 747 in_dev->mr_ifc_count--; 748 igmp_ifc_start_timer(in_dev, 749 unsolicited_report_interval(in_dev)); 750 } 751 in_dev_put(in_dev); 752 } 753 754 static void igmp_ifc_event(struct in_device *in_dev) 755 { 756 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 757 return; 758 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv; 759 igmp_ifc_start_timer(in_dev, 1); 760 } 761 762 763 static void igmp_timer_expire(unsigned long data) 764 { 765 struct ip_mc_list *im = (struct ip_mc_list *)data; 766 struct in_device *in_dev = im->interface; 767 768 spin_lock(&im->lock); 769 im->tm_running = 0; 770 771 if (im->unsolicit_count) { 772 im->unsolicit_count--; 773 igmp_start_timer(im, unsolicited_report_interval(in_dev)); 774 } 775 im->reporter = 1; 776 spin_unlock(&im->lock); 777 778 if (IGMP_V1_SEEN(in_dev)) 779 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 780 else if (IGMP_V2_SEEN(in_dev)) 781 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 782 else 783 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 784 785 ip_ma_put(im); 786 } 787 788 /* mark EXCLUDE-mode sources */ 789 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 790 { 791 struct ip_sf_list *psf; 792 int i, scount; 793 794 scount = 0; 795 for (psf = pmc->sources; psf; psf = psf->sf_next) { 796 if (scount == nsrcs) 797 break; 798 for (i = 0; i < nsrcs; i++) { 799 /* skip inactive filters */ 800 if (psf->sf_count[MCAST_INCLUDE] || 801 pmc->sfcount[MCAST_EXCLUDE] != 802 psf->sf_count[MCAST_EXCLUDE]) 803 break; 804 if (srcs[i] == psf->sf_inaddr) { 805 scount++; 806 break; 807 } 808 } 809 } 810 pmc->gsquery = 0; 811 if (scount == nsrcs) /* all sources excluded */ 812 return 0; 813 return 1; 814 } 815 816 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 817 { 818 struct ip_sf_list *psf; 819 int i, scount; 820 821 if (pmc->sfmode == MCAST_EXCLUDE) 822 return igmp_xmarksources(pmc, nsrcs, srcs); 823 824 /* mark INCLUDE-mode sources */ 825 scount = 0; 826 for (psf = pmc->sources; psf; psf = psf->sf_next) { 827 if (scount == nsrcs) 828 break; 829 for (i = 0; i < nsrcs; i++) 830 if (srcs[i] == psf->sf_inaddr) { 831 psf->sf_gsresp = 1; 832 scount++; 833 break; 834 } 835 } 836 if (!scount) { 837 pmc->gsquery = 0; 838 return 0; 839 } 840 pmc->gsquery = 1; 841 return 1; 842 } 843 844 /* return true if packet was dropped */ 845 static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 846 { 847 struct ip_mc_list *im; 848 849 /* Timers are only set for non-local groups */ 850 851 if (group == IGMP_ALL_HOSTS) 852 return false; 853 854 rcu_read_lock(); 855 for_each_pmc_rcu(in_dev, im) { 856 if (im->multiaddr == group) { 857 igmp_stop_timer(im); 858 break; 859 } 860 } 861 rcu_read_unlock(); 862 return false; 863 } 864 865 /* return true if packet was dropped */ 866 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 867 int len) 868 { 869 struct igmphdr *ih = igmp_hdr(skb); 870 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 871 struct ip_mc_list *im; 872 __be32 group = ih->group; 873 int max_delay; 874 int mark = 0; 875 876 877 if (len == 8) { 878 if (ih->code == 0) { 879 /* Alas, old v1 router presents here. */ 880 881 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 882 in_dev->mr_v1_seen = jiffies + 883 IGMP_V1_ROUTER_PRESENT_TIMEOUT; 884 group = 0; 885 } else { 886 /* v2 router present */ 887 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 888 in_dev->mr_v2_seen = jiffies + 889 IGMP_V2_ROUTER_PRESENT_TIMEOUT; 890 } 891 /* cancel the interface change timer */ 892 in_dev->mr_ifc_count = 0; 893 if (del_timer(&in_dev->mr_ifc_timer)) 894 __in_dev_put(in_dev); 895 /* clear deleted report items */ 896 igmpv3_clear_delrec(in_dev); 897 } else if (len < 12) { 898 return true; /* ignore bogus packet; freed by caller */ 899 } else if (IGMP_V1_SEEN(in_dev)) { 900 /* This is a v3 query with v1 queriers present */ 901 max_delay = IGMP_QUERY_RESPONSE_INTERVAL; 902 group = 0; 903 } else if (IGMP_V2_SEEN(in_dev)) { 904 /* this is a v3 query with v2 queriers present; 905 * Interpretation of the max_delay code is problematic here. 906 * A real v2 host would use ih_code directly, while v3 has a 907 * different encoding. We use the v3 encoding as more likely 908 * to be intended in a v3 query. 909 */ 910 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 911 if (!max_delay) 912 max_delay = 1; /* can't mod w/ 0 */ 913 } else { /* v3 */ 914 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 915 return true; 916 917 ih3 = igmpv3_query_hdr(skb); 918 if (ih3->nsrcs) { 919 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 920 + ntohs(ih3->nsrcs)*sizeof(__be32))) 921 return true; 922 ih3 = igmpv3_query_hdr(skb); 923 } 924 925 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 926 if (!max_delay) 927 max_delay = 1; /* can't mod w/ 0 */ 928 in_dev->mr_maxdelay = max_delay; 929 if (ih3->qrv) 930 in_dev->mr_qrv = ih3->qrv; 931 if (!group) { /* general query */ 932 if (ih3->nsrcs) 933 return true; /* no sources allowed */ 934 igmp_gq_start_timer(in_dev); 935 return false; 936 } 937 /* mark sources to include, if group & source-specific */ 938 mark = ih3->nsrcs != 0; 939 } 940 941 /* 942 * - Start the timers in all of our membership records 943 * that the query applies to for the interface on 944 * which the query arrived excl. those that belong 945 * to a "local" group (224.0.0.X) 946 * - For timers already running check if they need to 947 * be reset. 948 * - Use the igmp->igmp_code field as the maximum 949 * delay possible 950 */ 951 rcu_read_lock(); 952 for_each_pmc_rcu(in_dev, im) { 953 int changed; 954 955 if (group && group != im->multiaddr) 956 continue; 957 if (im->multiaddr == IGMP_ALL_HOSTS) 958 continue; 959 spin_lock_bh(&im->lock); 960 if (im->tm_running) 961 im->gsquery = im->gsquery && mark; 962 else 963 im->gsquery = mark; 964 changed = !im->gsquery || 965 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 966 spin_unlock_bh(&im->lock); 967 if (changed) 968 igmp_mod_timer(im, max_delay); 969 } 970 rcu_read_unlock(); 971 return false; 972 } 973 974 /* called in rcu_read_lock() section */ 975 int igmp_rcv(struct sk_buff *skb) 976 { 977 /* This basically follows the spec line by line -- see RFC1112 */ 978 struct igmphdr *ih; 979 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 980 int len = skb->len; 981 bool dropped = true; 982 983 if (in_dev == NULL) 984 goto drop; 985 986 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 987 goto drop; 988 989 if (skb_checksum_simple_validate(skb)) 990 goto drop; 991 992 ih = igmp_hdr(skb); 993 switch (ih->type) { 994 case IGMP_HOST_MEMBERSHIP_QUERY: 995 dropped = igmp_heard_query(in_dev, skb, len); 996 break; 997 case IGMP_HOST_MEMBERSHIP_REPORT: 998 case IGMPV2_HOST_MEMBERSHIP_REPORT: 999 /* Is it our report looped back? */ 1000 if (rt_is_output_route(skb_rtable(skb))) 1001 break; 1002 /* don't rely on MC router hearing unicast reports */ 1003 if (skb->pkt_type == PACKET_MULTICAST || 1004 skb->pkt_type == PACKET_BROADCAST) 1005 dropped = igmp_heard_report(in_dev, ih->group); 1006 break; 1007 case IGMP_PIM: 1008 #ifdef CONFIG_IP_PIMSM_V1 1009 return pim_rcv_v1(skb); 1010 #endif 1011 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1012 case IGMP_DVMRP: 1013 case IGMP_TRACE: 1014 case IGMP_HOST_LEAVE_MESSAGE: 1015 case IGMP_MTRACE: 1016 case IGMP_MTRACE_RESP: 1017 break; 1018 default: 1019 break; 1020 } 1021 1022 drop: 1023 if (dropped) 1024 kfree_skb(skb); 1025 else 1026 consume_skb(skb); 1027 return 0; 1028 } 1029 1030 #endif 1031 1032 1033 /* 1034 * Add a filter to a device 1035 */ 1036 1037 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1038 { 1039 char buf[MAX_ADDR_LEN]; 1040 struct net_device *dev = in_dev->dev; 1041 1042 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1043 We will get multicast token leakage, when IFF_MULTICAST 1044 is changed. This check should be done in ndo_set_rx_mode 1045 routine. Something sort of: 1046 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1047 --ANK 1048 */ 1049 if (arp_mc_map(addr, buf, dev, 0) == 0) 1050 dev_mc_add(dev, buf); 1051 } 1052 1053 /* 1054 * Remove a filter from a device 1055 */ 1056 1057 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1058 { 1059 char buf[MAX_ADDR_LEN]; 1060 struct net_device *dev = in_dev->dev; 1061 1062 if (arp_mc_map(addr, buf, dev, 0) == 0) 1063 dev_mc_del(dev, buf); 1064 } 1065 1066 #ifdef CONFIG_IP_MULTICAST 1067 /* 1068 * deleted ip_mc_list manipulation 1069 */ 1070 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1071 { 1072 struct ip_mc_list *pmc; 1073 1074 /* this is an "ip_mc_list" for convenience; only the fields below 1075 * are actually used. In particular, the refcnt and users are not 1076 * used for management of the delete list. Using the same structure 1077 * for deleted items allows change reports to use common code with 1078 * non-deleted or query-response MCA's. 1079 */ 1080 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1081 if (!pmc) 1082 return; 1083 spin_lock_bh(&im->lock); 1084 pmc->interface = im->interface; 1085 in_dev_hold(in_dev); 1086 pmc->multiaddr = im->multiaddr; 1087 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1088 pmc->sfmode = im->sfmode; 1089 if (pmc->sfmode == MCAST_INCLUDE) { 1090 struct ip_sf_list *psf; 1091 1092 pmc->tomb = im->tomb; 1093 pmc->sources = im->sources; 1094 im->tomb = im->sources = NULL; 1095 for (psf = pmc->sources; psf; psf = psf->sf_next) 1096 psf->sf_crcount = pmc->crcount; 1097 } 1098 spin_unlock_bh(&im->lock); 1099 1100 spin_lock_bh(&in_dev->mc_tomb_lock); 1101 pmc->next = in_dev->mc_tomb; 1102 in_dev->mc_tomb = pmc; 1103 spin_unlock_bh(&in_dev->mc_tomb_lock); 1104 } 1105 1106 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1107 { 1108 struct ip_mc_list *pmc, *pmc_prev; 1109 struct ip_sf_list *psf, *psf_next; 1110 1111 spin_lock_bh(&in_dev->mc_tomb_lock); 1112 pmc_prev = NULL; 1113 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1114 if (pmc->multiaddr == multiaddr) 1115 break; 1116 pmc_prev = pmc; 1117 } 1118 if (pmc) { 1119 if (pmc_prev) 1120 pmc_prev->next = pmc->next; 1121 else 1122 in_dev->mc_tomb = pmc->next; 1123 } 1124 spin_unlock_bh(&in_dev->mc_tomb_lock); 1125 if (pmc) { 1126 for (psf = pmc->tomb; psf; psf = psf_next) { 1127 psf_next = psf->sf_next; 1128 kfree(psf); 1129 } 1130 in_dev_put(pmc->interface); 1131 kfree(pmc); 1132 } 1133 } 1134 1135 static void igmpv3_clear_delrec(struct in_device *in_dev) 1136 { 1137 struct ip_mc_list *pmc, *nextpmc; 1138 1139 spin_lock_bh(&in_dev->mc_tomb_lock); 1140 pmc = in_dev->mc_tomb; 1141 in_dev->mc_tomb = NULL; 1142 spin_unlock_bh(&in_dev->mc_tomb_lock); 1143 1144 for (; pmc; pmc = nextpmc) { 1145 nextpmc = pmc->next; 1146 ip_mc_clear_src(pmc); 1147 in_dev_put(pmc->interface); 1148 kfree(pmc); 1149 } 1150 /* clear dead sources, too */ 1151 rcu_read_lock(); 1152 for_each_pmc_rcu(in_dev, pmc) { 1153 struct ip_sf_list *psf, *psf_next; 1154 1155 spin_lock_bh(&pmc->lock); 1156 psf = pmc->tomb; 1157 pmc->tomb = NULL; 1158 spin_unlock_bh(&pmc->lock); 1159 for (; psf; psf = psf_next) { 1160 psf_next = psf->sf_next; 1161 kfree(psf); 1162 } 1163 } 1164 rcu_read_unlock(); 1165 } 1166 #endif 1167 1168 static void igmp_group_dropped(struct ip_mc_list *im) 1169 { 1170 struct in_device *in_dev = im->interface; 1171 #ifdef CONFIG_IP_MULTICAST 1172 int reporter; 1173 #endif 1174 1175 if (im->loaded) { 1176 im->loaded = 0; 1177 ip_mc_filter_del(in_dev, im->multiaddr); 1178 } 1179 1180 #ifdef CONFIG_IP_MULTICAST 1181 if (im->multiaddr == IGMP_ALL_HOSTS) 1182 return; 1183 1184 reporter = im->reporter; 1185 igmp_stop_timer(im); 1186 1187 if (!in_dev->dead) { 1188 if (IGMP_V1_SEEN(in_dev)) 1189 return; 1190 if (IGMP_V2_SEEN(in_dev)) { 1191 if (reporter) 1192 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1193 return; 1194 } 1195 /* IGMPv3 */ 1196 igmpv3_add_delrec(in_dev, im); 1197 1198 igmp_ifc_event(in_dev); 1199 } 1200 #endif 1201 } 1202 1203 static void igmp_group_added(struct ip_mc_list *im) 1204 { 1205 struct in_device *in_dev = im->interface; 1206 1207 if (im->loaded == 0) { 1208 im->loaded = 1; 1209 ip_mc_filter_add(in_dev, im->multiaddr); 1210 } 1211 1212 #ifdef CONFIG_IP_MULTICAST 1213 if (im->multiaddr == IGMP_ALL_HOSTS) 1214 return; 1215 1216 if (in_dev->dead) 1217 return; 1218 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1219 spin_lock_bh(&im->lock); 1220 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); 1221 spin_unlock_bh(&im->lock); 1222 return; 1223 } 1224 /* else, v3 */ 1225 1226 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1227 igmp_ifc_event(in_dev); 1228 #endif 1229 } 1230 1231 1232 /* 1233 * Multicast list managers 1234 */ 1235 1236 static u32 ip_mc_hash(const struct ip_mc_list *im) 1237 { 1238 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1239 } 1240 1241 static void ip_mc_hash_add(struct in_device *in_dev, 1242 struct ip_mc_list *im) 1243 { 1244 struct ip_mc_list __rcu **mc_hash; 1245 u32 hash; 1246 1247 mc_hash = rtnl_dereference(in_dev->mc_hash); 1248 if (mc_hash) { 1249 hash = ip_mc_hash(im); 1250 im->next_hash = mc_hash[hash]; 1251 rcu_assign_pointer(mc_hash[hash], im); 1252 return; 1253 } 1254 1255 /* do not use a hash table for small number of items */ 1256 if (in_dev->mc_count < 4) 1257 return; 1258 1259 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1260 GFP_KERNEL); 1261 if (!mc_hash) 1262 return; 1263 1264 for_each_pmc_rtnl(in_dev, im) { 1265 hash = ip_mc_hash(im); 1266 im->next_hash = mc_hash[hash]; 1267 RCU_INIT_POINTER(mc_hash[hash], im); 1268 } 1269 1270 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1271 } 1272 1273 static void ip_mc_hash_remove(struct in_device *in_dev, 1274 struct ip_mc_list *im) 1275 { 1276 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1277 struct ip_mc_list *aux; 1278 1279 if (!mc_hash) 1280 return; 1281 mc_hash += ip_mc_hash(im); 1282 while ((aux = rtnl_dereference(*mc_hash)) != im) 1283 mc_hash = &aux->next_hash; 1284 *mc_hash = im->next_hash; 1285 } 1286 1287 1288 /* 1289 * A socket has joined a multicast group on device dev. 1290 */ 1291 1292 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1293 { 1294 struct ip_mc_list *im; 1295 1296 ASSERT_RTNL(); 1297 1298 for_each_pmc_rtnl(in_dev, im) { 1299 if (im->multiaddr == addr) { 1300 im->users++; 1301 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1302 goto out; 1303 } 1304 } 1305 1306 im = kzalloc(sizeof(*im), GFP_KERNEL); 1307 if (!im) 1308 goto out; 1309 1310 im->users = 1; 1311 im->interface = in_dev; 1312 in_dev_hold(in_dev); 1313 im->multiaddr = addr; 1314 /* initial mode is (EX, empty) */ 1315 im->sfmode = MCAST_EXCLUDE; 1316 im->sfcount[MCAST_EXCLUDE] = 1; 1317 atomic_set(&im->refcnt, 1); 1318 spin_lock_init(&im->lock); 1319 #ifdef CONFIG_IP_MULTICAST 1320 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); 1321 im->unsolicit_count = sysctl_igmp_qrv; 1322 #endif 1323 1324 im->next_rcu = in_dev->mc_list; 1325 in_dev->mc_count++; 1326 rcu_assign_pointer(in_dev->mc_list, im); 1327 1328 ip_mc_hash_add(in_dev, im); 1329 1330 #ifdef CONFIG_IP_MULTICAST 1331 igmpv3_del_delrec(in_dev, im->multiaddr); 1332 #endif 1333 igmp_group_added(im); 1334 if (!in_dev->dead) 1335 ip_rt_multicast_event(in_dev); 1336 out: 1337 return; 1338 } 1339 EXPORT_SYMBOL(ip_mc_inc_group); 1340 1341 /* 1342 * Resend IGMP JOIN report; used by netdev notifier. 1343 */ 1344 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1345 { 1346 #ifdef CONFIG_IP_MULTICAST 1347 struct ip_mc_list *im; 1348 int type; 1349 1350 ASSERT_RTNL(); 1351 1352 for_each_pmc_rtnl(in_dev, im) { 1353 if (im->multiaddr == IGMP_ALL_HOSTS) 1354 continue; 1355 1356 /* a failover is happening and switches 1357 * must be notified immediately 1358 */ 1359 if (IGMP_V1_SEEN(in_dev)) 1360 type = IGMP_HOST_MEMBERSHIP_REPORT; 1361 else if (IGMP_V2_SEEN(in_dev)) 1362 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1363 else 1364 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1365 igmp_send_report(in_dev, im, type); 1366 } 1367 #endif 1368 } 1369 1370 /* 1371 * A socket has left a multicast group on device dev 1372 */ 1373 1374 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1375 { 1376 struct ip_mc_list *i; 1377 struct ip_mc_list __rcu **ip; 1378 1379 ASSERT_RTNL(); 1380 1381 for (ip = &in_dev->mc_list; 1382 (i = rtnl_dereference(*ip)) != NULL; 1383 ip = &i->next_rcu) { 1384 if (i->multiaddr == addr) { 1385 if (--i->users == 0) { 1386 ip_mc_hash_remove(in_dev, i); 1387 *ip = i->next_rcu; 1388 in_dev->mc_count--; 1389 igmp_group_dropped(i); 1390 ip_mc_clear_src(i); 1391 1392 if (!in_dev->dead) 1393 ip_rt_multicast_event(in_dev); 1394 1395 ip_ma_put(i); 1396 return; 1397 } 1398 break; 1399 } 1400 } 1401 } 1402 EXPORT_SYMBOL(ip_mc_dec_group); 1403 1404 /* Device changing type */ 1405 1406 void ip_mc_unmap(struct in_device *in_dev) 1407 { 1408 struct ip_mc_list *pmc; 1409 1410 ASSERT_RTNL(); 1411 1412 for_each_pmc_rtnl(in_dev, pmc) 1413 igmp_group_dropped(pmc); 1414 } 1415 1416 void ip_mc_remap(struct in_device *in_dev) 1417 { 1418 struct ip_mc_list *pmc; 1419 1420 ASSERT_RTNL(); 1421 1422 for_each_pmc_rtnl(in_dev, pmc) 1423 igmp_group_added(pmc); 1424 } 1425 1426 /* Device going down */ 1427 1428 void ip_mc_down(struct in_device *in_dev) 1429 { 1430 struct ip_mc_list *pmc; 1431 1432 ASSERT_RTNL(); 1433 1434 for_each_pmc_rtnl(in_dev, pmc) 1435 igmp_group_dropped(pmc); 1436 1437 #ifdef CONFIG_IP_MULTICAST 1438 in_dev->mr_ifc_count = 0; 1439 if (del_timer(&in_dev->mr_ifc_timer)) 1440 __in_dev_put(in_dev); 1441 in_dev->mr_gq_running = 0; 1442 if (del_timer(&in_dev->mr_gq_timer)) 1443 __in_dev_put(in_dev); 1444 igmpv3_clear_delrec(in_dev); 1445 #endif 1446 1447 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1448 } 1449 1450 void ip_mc_init_dev(struct in_device *in_dev) 1451 { 1452 ASSERT_RTNL(); 1453 1454 #ifdef CONFIG_IP_MULTICAST 1455 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1456 (unsigned long)in_dev); 1457 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1458 (unsigned long)in_dev); 1459 in_dev->mr_qrv = sysctl_igmp_qrv; 1460 #endif 1461 1462 spin_lock_init(&in_dev->mc_tomb_lock); 1463 } 1464 1465 /* Device going up */ 1466 1467 void ip_mc_up(struct in_device *in_dev) 1468 { 1469 struct ip_mc_list *pmc; 1470 1471 ASSERT_RTNL(); 1472 1473 #ifdef CONFIG_IP_MULTICAST 1474 in_dev->mr_qrv = sysctl_igmp_qrv; 1475 #endif 1476 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1477 1478 for_each_pmc_rtnl(in_dev, pmc) 1479 igmp_group_added(pmc); 1480 } 1481 1482 /* 1483 * Device is about to be destroyed: clean up. 1484 */ 1485 1486 void ip_mc_destroy_dev(struct in_device *in_dev) 1487 { 1488 struct ip_mc_list *i; 1489 1490 ASSERT_RTNL(); 1491 1492 /* Deactivate timers */ 1493 ip_mc_down(in_dev); 1494 1495 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1496 in_dev->mc_list = i->next_rcu; 1497 in_dev->mc_count--; 1498 1499 /* We've dropped the groups in ip_mc_down already */ 1500 ip_mc_clear_src(i); 1501 ip_ma_put(i); 1502 } 1503 } 1504 1505 /* RTNL is locked */ 1506 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1507 { 1508 struct net_device *dev = NULL; 1509 struct in_device *idev = NULL; 1510 1511 if (imr->imr_ifindex) { 1512 idev = inetdev_by_index(net, imr->imr_ifindex); 1513 return idev; 1514 } 1515 if (imr->imr_address.s_addr) { 1516 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1517 if (!dev) 1518 return NULL; 1519 } 1520 1521 if (!dev) { 1522 struct rtable *rt = ip_route_output(net, 1523 imr->imr_multiaddr.s_addr, 1524 0, 0, 0); 1525 if (!IS_ERR(rt)) { 1526 dev = rt->dst.dev; 1527 ip_rt_put(rt); 1528 } 1529 } 1530 if (dev) { 1531 imr->imr_ifindex = dev->ifindex; 1532 idev = __in_dev_get_rtnl(dev); 1533 } 1534 return idev; 1535 } 1536 1537 /* 1538 * Join a socket to a group 1539 */ 1540 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1541 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1542 #ifdef CONFIG_IP_MULTICAST 1543 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE; 1544 #endif 1545 1546 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1547 __be32 *psfsrc) 1548 { 1549 struct ip_sf_list *psf, *psf_prev; 1550 int rv = 0; 1551 1552 psf_prev = NULL; 1553 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1554 if (psf->sf_inaddr == *psfsrc) 1555 break; 1556 psf_prev = psf; 1557 } 1558 if (!psf || psf->sf_count[sfmode] == 0) { 1559 /* source filter not found, or count wrong => bug */ 1560 return -ESRCH; 1561 } 1562 psf->sf_count[sfmode]--; 1563 if (psf->sf_count[sfmode] == 0) { 1564 ip_rt_multicast_event(pmc->interface); 1565 } 1566 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1567 #ifdef CONFIG_IP_MULTICAST 1568 struct in_device *in_dev = pmc->interface; 1569 #endif 1570 1571 /* no more filters for this source */ 1572 if (psf_prev) 1573 psf_prev->sf_next = psf->sf_next; 1574 else 1575 pmc->sources = psf->sf_next; 1576 #ifdef CONFIG_IP_MULTICAST 1577 if (psf->sf_oldin && 1578 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1579 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1580 psf->sf_next = pmc->tomb; 1581 pmc->tomb = psf; 1582 rv = 1; 1583 } else 1584 #endif 1585 kfree(psf); 1586 } 1587 return rv; 1588 } 1589 1590 #ifndef CONFIG_IP_MULTICAST 1591 #define igmp_ifc_event(x) do { } while (0) 1592 #endif 1593 1594 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1595 int sfcount, __be32 *psfsrc, int delta) 1596 { 1597 struct ip_mc_list *pmc; 1598 int changerec = 0; 1599 int i, err; 1600 1601 if (!in_dev) 1602 return -ENODEV; 1603 rcu_read_lock(); 1604 for_each_pmc_rcu(in_dev, pmc) { 1605 if (*pmca == pmc->multiaddr) 1606 break; 1607 } 1608 if (!pmc) { 1609 /* MCA not found?? bug */ 1610 rcu_read_unlock(); 1611 return -ESRCH; 1612 } 1613 spin_lock_bh(&pmc->lock); 1614 rcu_read_unlock(); 1615 #ifdef CONFIG_IP_MULTICAST 1616 sf_markstate(pmc); 1617 #endif 1618 if (!delta) { 1619 err = -EINVAL; 1620 if (!pmc->sfcount[sfmode]) 1621 goto out_unlock; 1622 pmc->sfcount[sfmode]--; 1623 } 1624 err = 0; 1625 for (i = 0; i < sfcount; i++) { 1626 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1627 1628 changerec |= rv > 0; 1629 if (!err && rv < 0) 1630 err = rv; 1631 } 1632 if (pmc->sfmode == MCAST_EXCLUDE && 1633 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1634 pmc->sfcount[MCAST_INCLUDE]) { 1635 #ifdef CONFIG_IP_MULTICAST 1636 struct ip_sf_list *psf; 1637 #endif 1638 1639 /* filter mode change */ 1640 pmc->sfmode = MCAST_INCLUDE; 1641 #ifdef CONFIG_IP_MULTICAST 1642 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1643 in_dev->mr_ifc_count = pmc->crcount; 1644 for (psf = pmc->sources; psf; psf = psf->sf_next) 1645 psf->sf_crcount = 0; 1646 igmp_ifc_event(pmc->interface); 1647 } else if (sf_setstate(pmc) || changerec) { 1648 igmp_ifc_event(pmc->interface); 1649 #endif 1650 } 1651 out_unlock: 1652 spin_unlock_bh(&pmc->lock); 1653 return err; 1654 } 1655 1656 /* 1657 * Add multicast single-source filter to the interface list 1658 */ 1659 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1660 __be32 *psfsrc) 1661 { 1662 struct ip_sf_list *psf, *psf_prev; 1663 1664 psf_prev = NULL; 1665 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1666 if (psf->sf_inaddr == *psfsrc) 1667 break; 1668 psf_prev = psf; 1669 } 1670 if (!psf) { 1671 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1672 if (!psf) 1673 return -ENOBUFS; 1674 psf->sf_inaddr = *psfsrc; 1675 if (psf_prev) { 1676 psf_prev->sf_next = psf; 1677 } else 1678 pmc->sources = psf; 1679 } 1680 psf->sf_count[sfmode]++; 1681 if (psf->sf_count[sfmode] == 1) { 1682 ip_rt_multicast_event(pmc->interface); 1683 } 1684 return 0; 1685 } 1686 1687 #ifdef CONFIG_IP_MULTICAST 1688 static void sf_markstate(struct ip_mc_list *pmc) 1689 { 1690 struct ip_sf_list *psf; 1691 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1692 1693 for (psf = pmc->sources; psf; psf = psf->sf_next) 1694 if (pmc->sfcount[MCAST_EXCLUDE]) { 1695 psf->sf_oldin = mca_xcount == 1696 psf->sf_count[MCAST_EXCLUDE] && 1697 !psf->sf_count[MCAST_INCLUDE]; 1698 } else 1699 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1700 } 1701 1702 static int sf_setstate(struct ip_mc_list *pmc) 1703 { 1704 struct ip_sf_list *psf, *dpsf; 1705 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1706 int qrv = pmc->interface->mr_qrv; 1707 int new_in, rv; 1708 1709 rv = 0; 1710 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1711 if (pmc->sfcount[MCAST_EXCLUDE]) { 1712 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1713 !psf->sf_count[MCAST_INCLUDE]; 1714 } else 1715 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1716 if (new_in) { 1717 if (!psf->sf_oldin) { 1718 struct ip_sf_list *prev = NULL; 1719 1720 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 1721 if (dpsf->sf_inaddr == psf->sf_inaddr) 1722 break; 1723 prev = dpsf; 1724 } 1725 if (dpsf) { 1726 if (prev) 1727 prev->sf_next = dpsf->sf_next; 1728 else 1729 pmc->tomb = dpsf->sf_next; 1730 kfree(dpsf); 1731 } 1732 psf->sf_crcount = qrv; 1733 rv++; 1734 } 1735 } else if (psf->sf_oldin) { 1736 1737 psf->sf_crcount = 0; 1738 /* 1739 * add or update "delete" records if an active filter 1740 * is now inactive 1741 */ 1742 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 1743 if (dpsf->sf_inaddr == psf->sf_inaddr) 1744 break; 1745 if (!dpsf) { 1746 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1747 if (!dpsf) 1748 continue; 1749 *dpsf = *psf; 1750 /* pmc->lock held by callers */ 1751 dpsf->sf_next = pmc->tomb; 1752 pmc->tomb = dpsf; 1753 } 1754 dpsf->sf_crcount = qrv; 1755 rv++; 1756 } 1757 } 1758 return rv; 1759 } 1760 #endif 1761 1762 /* 1763 * Add multicast source filter list to the interface list 1764 */ 1765 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1766 int sfcount, __be32 *psfsrc, int delta) 1767 { 1768 struct ip_mc_list *pmc; 1769 int isexclude; 1770 int i, err; 1771 1772 if (!in_dev) 1773 return -ENODEV; 1774 rcu_read_lock(); 1775 for_each_pmc_rcu(in_dev, pmc) { 1776 if (*pmca == pmc->multiaddr) 1777 break; 1778 } 1779 if (!pmc) { 1780 /* MCA not found?? bug */ 1781 rcu_read_unlock(); 1782 return -ESRCH; 1783 } 1784 spin_lock_bh(&pmc->lock); 1785 rcu_read_unlock(); 1786 1787 #ifdef CONFIG_IP_MULTICAST 1788 sf_markstate(pmc); 1789 #endif 1790 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1791 if (!delta) 1792 pmc->sfcount[sfmode]++; 1793 err = 0; 1794 for (i = 0; i < sfcount; i++) { 1795 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1796 if (err) 1797 break; 1798 } 1799 if (err) { 1800 int j; 1801 1802 if (!delta) 1803 pmc->sfcount[sfmode]--; 1804 for (j = 0; j < i; j++) 1805 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1806 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1807 #ifdef CONFIG_IP_MULTICAST 1808 struct ip_sf_list *psf; 1809 in_dev = pmc->interface; 1810 #endif 1811 1812 /* filter mode change */ 1813 if (pmc->sfcount[MCAST_EXCLUDE]) 1814 pmc->sfmode = MCAST_EXCLUDE; 1815 else if (pmc->sfcount[MCAST_INCLUDE]) 1816 pmc->sfmode = MCAST_INCLUDE; 1817 #ifdef CONFIG_IP_MULTICAST 1818 /* else no filters; keep old mode for reports */ 1819 1820 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; 1821 in_dev->mr_ifc_count = pmc->crcount; 1822 for (psf = pmc->sources; psf; psf = psf->sf_next) 1823 psf->sf_crcount = 0; 1824 igmp_ifc_event(in_dev); 1825 } else if (sf_setstate(pmc)) { 1826 igmp_ifc_event(in_dev); 1827 #endif 1828 } 1829 spin_unlock_bh(&pmc->lock); 1830 return err; 1831 } 1832 1833 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1834 { 1835 struct ip_sf_list *psf, *nextpsf; 1836 1837 for (psf = pmc->tomb; psf; psf = nextpsf) { 1838 nextpsf = psf->sf_next; 1839 kfree(psf); 1840 } 1841 pmc->tomb = NULL; 1842 for (psf = pmc->sources; psf; psf = nextpsf) { 1843 nextpsf = psf->sf_next; 1844 kfree(psf); 1845 } 1846 pmc->sources = NULL; 1847 pmc->sfmode = MCAST_EXCLUDE; 1848 pmc->sfcount[MCAST_INCLUDE] = 0; 1849 pmc->sfcount[MCAST_EXCLUDE] = 1; 1850 } 1851 1852 1853 /* 1854 * Join a multicast group 1855 */ 1856 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1857 { 1858 int err; 1859 __be32 addr = imr->imr_multiaddr.s_addr; 1860 struct ip_mc_socklist *iml = NULL, *i; 1861 struct in_device *in_dev; 1862 struct inet_sock *inet = inet_sk(sk); 1863 struct net *net = sock_net(sk); 1864 int ifindex; 1865 int count = 0; 1866 1867 if (!ipv4_is_multicast(addr)) 1868 return -EINVAL; 1869 1870 rtnl_lock(); 1871 1872 in_dev = ip_mc_find_dev(net, imr); 1873 1874 if (!in_dev) { 1875 iml = NULL; 1876 err = -ENODEV; 1877 goto done; 1878 } 1879 1880 err = -EADDRINUSE; 1881 ifindex = imr->imr_ifindex; 1882 for_each_pmc_rtnl(inet, i) { 1883 if (i->multi.imr_multiaddr.s_addr == addr && 1884 i->multi.imr_ifindex == ifindex) 1885 goto done; 1886 count++; 1887 } 1888 err = -ENOBUFS; 1889 if (count >= sysctl_igmp_max_memberships) 1890 goto done; 1891 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1892 if (iml == NULL) 1893 goto done; 1894 1895 memcpy(&iml->multi, imr, sizeof(*imr)); 1896 iml->next_rcu = inet->mc_list; 1897 iml->sflist = NULL; 1898 iml->sfmode = MCAST_EXCLUDE; 1899 rcu_assign_pointer(inet->mc_list, iml); 1900 ip_mc_inc_group(in_dev, addr); 1901 err = 0; 1902 done: 1903 rtnl_unlock(); 1904 return err; 1905 } 1906 EXPORT_SYMBOL(ip_mc_join_group); 1907 1908 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1909 struct in_device *in_dev) 1910 { 1911 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1912 int err; 1913 1914 if (psf == NULL) { 1915 /* any-source empty exclude case */ 1916 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1917 iml->sfmode, 0, NULL, 0); 1918 } 1919 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1920 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1921 RCU_INIT_POINTER(iml->sflist, NULL); 1922 /* decrease mem now to avoid the memleak warning */ 1923 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1924 kfree_rcu(psf, rcu); 1925 return err; 1926 } 1927 1928 /* 1929 * Ask a socket to leave a group. 1930 */ 1931 1932 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1933 { 1934 struct inet_sock *inet = inet_sk(sk); 1935 struct ip_mc_socklist *iml; 1936 struct ip_mc_socklist __rcu **imlp; 1937 struct in_device *in_dev; 1938 struct net *net = sock_net(sk); 1939 __be32 group = imr->imr_multiaddr.s_addr; 1940 u32 ifindex; 1941 int ret = -EADDRNOTAVAIL; 1942 1943 rtnl_lock(); 1944 in_dev = ip_mc_find_dev(net, imr); 1945 if (!in_dev) { 1946 ret = -ENODEV; 1947 goto out; 1948 } 1949 ifindex = imr->imr_ifindex; 1950 for (imlp = &inet->mc_list; 1951 (iml = rtnl_dereference(*imlp)) != NULL; 1952 imlp = &iml->next_rcu) { 1953 if (iml->multi.imr_multiaddr.s_addr != group) 1954 continue; 1955 if (ifindex) { 1956 if (iml->multi.imr_ifindex != ifindex) 1957 continue; 1958 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1959 iml->multi.imr_address.s_addr) 1960 continue; 1961 1962 (void) ip_mc_leave_src(sk, iml, in_dev); 1963 1964 *imlp = iml->next_rcu; 1965 1966 ip_mc_dec_group(in_dev, group); 1967 rtnl_unlock(); 1968 /* decrease mem now to avoid the memleak warning */ 1969 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1970 kfree_rcu(iml, rcu); 1971 return 0; 1972 } 1973 out: 1974 rtnl_unlock(); 1975 return ret; 1976 } 1977 EXPORT_SYMBOL(ip_mc_leave_group); 1978 1979 int ip_mc_source(int add, int omode, struct sock *sk, struct 1980 ip_mreq_source *mreqs, int ifindex) 1981 { 1982 int err; 1983 struct ip_mreqn imr; 1984 __be32 addr = mreqs->imr_multiaddr; 1985 struct ip_mc_socklist *pmc; 1986 struct in_device *in_dev = NULL; 1987 struct inet_sock *inet = inet_sk(sk); 1988 struct ip_sf_socklist *psl; 1989 struct net *net = sock_net(sk); 1990 int leavegroup = 0; 1991 int i, j, rv; 1992 1993 if (!ipv4_is_multicast(addr)) 1994 return -EINVAL; 1995 1996 rtnl_lock(); 1997 1998 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1999 imr.imr_address.s_addr = mreqs->imr_interface; 2000 imr.imr_ifindex = ifindex; 2001 in_dev = ip_mc_find_dev(net, &imr); 2002 2003 if (!in_dev) { 2004 err = -ENODEV; 2005 goto done; 2006 } 2007 err = -EADDRNOTAVAIL; 2008 2009 for_each_pmc_rtnl(inet, pmc) { 2010 if ((pmc->multi.imr_multiaddr.s_addr == 2011 imr.imr_multiaddr.s_addr) && 2012 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2013 break; 2014 } 2015 if (!pmc) { /* must have a prior join */ 2016 err = -EINVAL; 2017 goto done; 2018 } 2019 /* if a source filter was set, must be the same mode as before */ 2020 if (pmc->sflist) { 2021 if (pmc->sfmode != omode) { 2022 err = -EINVAL; 2023 goto done; 2024 } 2025 } else if (pmc->sfmode != omode) { 2026 /* allow mode switches for empty-set filters */ 2027 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2028 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2029 NULL, 0); 2030 pmc->sfmode = omode; 2031 } 2032 2033 psl = rtnl_dereference(pmc->sflist); 2034 if (!add) { 2035 if (!psl) 2036 goto done; /* err = -EADDRNOTAVAIL */ 2037 rv = !0; 2038 for (i = 0; i < psl->sl_count; i++) { 2039 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2040 sizeof(__be32)); 2041 if (rv == 0) 2042 break; 2043 } 2044 if (rv) /* source not found */ 2045 goto done; /* err = -EADDRNOTAVAIL */ 2046 2047 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2048 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2049 leavegroup = 1; 2050 goto done; 2051 } 2052 2053 /* update the interface filter */ 2054 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2055 &mreqs->imr_sourceaddr, 1); 2056 2057 for (j = i+1; j < psl->sl_count; j++) 2058 psl->sl_addr[j-1] = psl->sl_addr[j]; 2059 psl->sl_count--; 2060 err = 0; 2061 goto done; 2062 } 2063 /* else, add a new source to the filter */ 2064 2065 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 2066 err = -ENOBUFS; 2067 goto done; 2068 } 2069 if (!psl || psl->sl_count == psl->sl_max) { 2070 struct ip_sf_socklist *newpsl; 2071 int count = IP_SFBLOCK; 2072 2073 if (psl) 2074 count += psl->sl_max; 2075 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2076 if (!newpsl) { 2077 err = -ENOBUFS; 2078 goto done; 2079 } 2080 newpsl->sl_max = count; 2081 newpsl->sl_count = count - IP_SFBLOCK; 2082 if (psl) { 2083 for (i = 0; i < psl->sl_count; i++) 2084 newpsl->sl_addr[i] = psl->sl_addr[i]; 2085 /* decrease mem now to avoid the memleak warning */ 2086 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2087 kfree_rcu(psl, rcu); 2088 } 2089 rcu_assign_pointer(pmc->sflist, newpsl); 2090 psl = newpsl; 2091 } 2092 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2093 for (i = 0; i < psl->sl_count; i++) { 2094 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2095 sizeof(__be32)); 2096 if (rv == 0) 2097 break; 2098 } 2099 if (rv == 0) /* address already there is an error */ 2100 goto done; 2101 for (j = psl->sl_count-1; j >= i; j--) 2102 psl->sl_addr[j+1] = psl->sl_addr[j]; 2103 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2104 psl->sl_count++; 2105 err = 0; 2106 /* update the interface list */ 2107 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2108 &mreqs->imr_sourceaddr, 1); 2109 done: 2110 rtnl_unlock(); 2111 if (leavegroup) 2112 return ip_mc_leave_group(sk, &imr); 2113 return err; 2114 } 2115 2116 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2117 { 2118 int err = 0; 2119 struct ip_mreqn imr; 2120 __be32 addr = msf->imsf_multiaddr; 2121 struct ip_mc_socklist *pmc; 2122 struct in_device *in_dev; 2123 struct inet_sock *inet = inet_sk(sk); 2124 struct ip_sf_socklist *newpsl, *psl; 2125 struct net *net = sock_net(sk); 2126 int leavegroup = 0; 2127 2128 if (!ipv4_is_multicast(addr)) 2129 return -EINVAL; 2130 if (msf->imsf_fmode != MCAST_INCLUDE && 2131 msf->imsf_fmode != MCAST_EXCLUDE) 2132 return -EINVAL; 2133 2134 rtnl_lock(); 2135 2136 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2137 imr.imr_address.s_addr = msf->imsf_interface; 2138 imr.imr_ifindex = ifindex; 2139 in_dev = ip_mc_find_dev(net, &imr); 2140 2141 if (!in_dev) { 2142 err = -ENODEV; 2143 goto done; 2144 } 2145 2146 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2147 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2148 leavegroup = 1; 2149 goto done; 2150 } 2151 2152 for_each_pmc_rtnl(inet, pmc) { 2153 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2154 pmc->multi.imr_ifindex == imr.imr_ifindex) 2155 break; 2156 } 2157 if (!pmc) { /* must have a prior join */ 2158 err = -EINVAL; 2159 goto done; 2160 } 2161 if (msf->imsf_numsrc) { 2162 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2163 GFP_KERNEL); 2164 if (!newpsl) { 2165 err = -ENOBUFS; 2166 goto done; 2167 } 2168 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2169 memcpy(newpsl->sl_addr, msf->imsf_slist, 2170 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2171 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2172 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2173 if (err) { 2174 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2175 goto done; 2176 } 2177 } else { 2178 newpsl = NULL; 2179 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2180 msf->imsf_fmode, 0, NULL, 0); 2181 } 2182 psl = rtnl_dereference(pmc->sflist); 2183 if (psl) { 2184 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2185 psl->sl_count, psl->sl_addr, 0); 2186 /* decrease mem now to avoid the memleak warning */ 2187 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2188 kfree_rcu(psl, rcu); 2189 } else 2190 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2191 0, NULL, 0); 2192 rcu_assign_pointer(pmc->sflist, newpsl); 2193 pmc->sfmode = msf->imsf_fmode; 2194 err = 0; 2195 done: 2196 rtnl_unlock(); 2197 if (leavegroup) 2198 err = ip_mc_leave_group(sk, &imr); 2199 return err; 2200 } 2201 2202 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2203 struct ip_msfilter __user *optval, int __user *optlen) 2204 { 2205 int err, len, count, copycount; 2206 struct ip_mreqn imr; 2207 __be32 addr = msf->imsf_multiaddr; 2208 struct ip_mc_socklist *pmc; 2209 struct in_device *in_dev; 2210 struct inet_sock *inet = inet_sk(sk); 2211 struct ip_sf_socklist *psl; 2212 struct net *net = sock_net(sk); 2213 2214 if (!ipv4_is_multicast(addr)) 2215 return -EINVAL; 2216 2217 rtnl_lock(); 2218 2219 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2220 imr.imr_address.s_addr = msf->imsf_interface; 2221 imr.imr_ifindex = 0; 2222 in_dev = ip_mc_find_dev(net, &imr); 2223 2224 if (!in_dev) { 2225 err = -ENODEV; 2226 goto done; 2227 } 2228 err = -EADDRNOTAVAIL; 2229 2230 for_each_pmc_rtnl(inet, pmc) { 2231 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2232 pmc->multi.imr_ifindex == imr.imr_ifindex) 2233 break; 2234 } 2235 if (!pmc) /* must have a prior join */ 2236 goto done; 2237 msf->imsf_fmode = pmc->sfmode; 2238 psl = rtnl_dereference(pmc->sflist); 2239 rtnl_unlock(); 2240 if (!psl) { 2241 len = 0; 2242 count = 0; 2243 } else { 2244 count = psl->sl_count; 2245 } 2246 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2247 len = copycount * sizeof(psl->sl_addr[0]); 2248 msf->imsf_numsrc = count; 2249 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2250 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2251 return -EFAULT; 2252 } 2253 if (len && 2254 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2255 return -EFAULT; 2256 return 0; 2257 done: 2258 rtnl_unlock(); 2259 return err; 2260 } 2261 2262 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2263 struct group_filter __user *optval, int __user *optlen) 2264 { 2265 int err, i, count, copycount; 2266 struct sockaddr_in *psin; 2267 __be32 addr; 2268 struct ip_mc_socklist *pmc; 2269 struct inet_sock *inet = inet_sk(sk); 2270 struct ip_sf_socklist *psl; 2271 2272 psin = (struct sockaddr_in *)&gsf->gf_group; 2273 if (psin->sin_family != AF_INET) 2274 return -EINVAL; 2275 addr = psin->sin_addr.s_addr; 2276 if (!ipv4_is_multicast(addr)) 2277 return -EINVAL; 2278 2279 rtnl_lock(); 2280 2281 err = -EADDRNOTAVAIL; 2282 2283 for_each_pmc_rtnl(inet, pmc) { 2284 if (pmc->multi.imr_multiaddr.s_addr == addr && 2285 pmc->multi.imr_ifindex == gsf->gf_interface) 2286 break; 2287 } 2288 if (!pmc) /* must have a prior join */ 2289 goto done; 2290 gsf->gf_fmode = pmc->sfmode; 2291 psl = rtnl_dereference(pmc->sflist); 2292 rtnl_unlock(); 2293 count = psl ? psl->sl_count : 0; 2294 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2295 gsf->gf_numsrc = count; 2296 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2297 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2298 return -EFAULT; 2299 } 2300 for (i = 0; i < copycount; i++) { 2301 struct sockaddr_storage ss; 2302 2303 psin = (struct sockaddr_in *)&ss; 2304 memset(&ss, 0, sizeof(ss)); 2305 psin->sin_family = AF_INET; 2306 psin->sin_addr.s_addr = psl->sl_addr[i]; 2307 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2308 return -EFAULT; 2309 } 2310 return 0; 2311 done: 2312 rtnl_unlock(); 2313 return err; 2314 } 2315 2316 /* 2317 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2318 */ 2319 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2320 { 2321 struct inet_sock *inet = inet_sk(sk); 2322 struct ip_mc_socklist *pmc; 2323 struct ip_sf_socklist *psl; 2324 int i; 2325 int ret; 2326 2327 ret = 1; 2328 if (!ipv4_is_multicast(loc_addr)) 2329 goto out; 2330 2331 rcu_read_lock(); 2332 for_each_pmc_rcu(inet, pmc) { 2333 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2334 pmc->multi.imr_ifindex == dif) 2335 break; 2336 } 2337 ret = inet->mc_all; 2338 if (!pmc) 2339 goto unlock; 2340 psl = rcu_dereference(pmc->sflist); 2341 ret = (pmc->sfmode == MCAST_EXCLUDE); 2342 if (!psl) 2343 goto unlock; 2344 2345 for (i = 0; i < psl->sl_count; i++) { 2346 if (psl->sl_addr[i] == rmt_addr) 2347 break; 2348 } 2349 ret = 0; 2350 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2351 goto unlock; 2352 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2353 goto unlock; 2354 ret = 1; 2355 unlock: 2356 rcu_read_unlock(); 2357 out: 2358 return ret; 2359 } 2360 2361 /* 2362 * A socket is closing. 2363 */ 2364 2365 void ip_mc_drop_socket(struct sock *sk) 2366 { 2367 struct inet_sock *inet = inet_sk(sk); 2368 struct ip_mc_socklist *iml; 2369 struct net *net = sock_net(sk); 2370 2371 if (inet->mc_list == NULL) 2372 return; 2373 2374 rtnl_lock(); 2375 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2376 struct in_device *in_dev; 2377 2378 inet->mc_list = iml->next_rcu; 2379 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2380 (void) ip_mc_leave_src(sk, iml, in_dev); 2381 if (in_dev != NULL) 2382 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2383 /* decrease mem now to avoid the memleak warning */ 2384 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2385 kfree_rcu(iml, rcu); 2386 } 2387 rtnl_unlock(); 2388 } 2389 2390 /* called with rcu_read_lock() */ 2391 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2392 { 2393 struct ip_mc_list *im; 2394 struct ip_mc_list __rcu **mc_hash; 2395 struct ip_sf_list *psf; 2396 int rv = 0; 2397 2398 mc_hash = rcu_dereference(in_dev->mc_hash); 2399 if (mc_hash) { 2400 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2401 2402 for (im = rcu_dereference(mc_hash[hash]); 2403 im != NULL; 2404 im = rcu_dereference(im->next_hash)) { 2405 if (im->multiaddr == mc_addr) 2406 break; 2407 } 2408 } else { 2409 for_each_pmc_rcu(in_dev, im) { 2410 if (im->multiaddr == mc_addr) 2411 break; 2412 } 2413 } 2414 if (im && proto == IPPROTO_IGMP) { 2415 rv = 1; 2416 } else if (im) { 2417 if (src_addr) { 2418 for (psf = im->sources; psf; psf = psf->sf_next) { 2419 if (psf->sf_inaddr == src_addr) 2420 break; 2421 } 2422 if (psf) 2423 rv = psf->sf_count[MCAST_INCLUDE] || 2424 psf->sf_count[MCAST_EXCLUDE] != 2425 im->sfcount[MCAST_EXCLUDE]; 2426 else 2427 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2428 } else 2429 rv = 1; /* unspecified source; tentatively allow */ 2430 } 2431 return rv; 2432 } 2433 2434 #if defined(CONFIG_PROC_FS) 2435 struct igmp_mc_iter_state { 2436 struct seq_net_private p; 2437 struct net_device *dev; 2438 struct in_device *in_dev; 2439 }; 2440 2441 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2442 2443 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2444 { 2445 struct net *net = seq_file_net(seq); 2446 struct ip_mc_list *im = NULL; 2447 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2448 2449 state->in_dev = NULL; 2450 for_each_netdev_rcu(net, state->dev) { 2451 struct in_device *in_dev; 2452 2453 in_dev = __in_dev_get_rcu(state->dev); 2454 if (!in_dev) 2455 continue; 2456 im = rcu_dereference(in_dev->mc_list); 2457 if (im) { 2458 state->in_dev = in_dev; 2459 break; 2460 } 2461 } 2462 return im; 2463 } 2464 2465 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2466 { 2467 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2468 2469 im = rcu_dereference(im->next_rcu); 2470 while (!im) { 2471 state->dev = next_net_device_rcu(state->dev); 2472 if (!state->dev) { 2473 state->in_dev = NULL; 2474 break; 2475 } 2476 state->in_dev = __in_dev_get_rcu(state->dev); 2477 if (!state->in_dev) 2478 continue; 2479 im = rcu_dereference(state->in_dev->mc_list); 2480 } 2481 return im; 2482 } 2483 2484 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2485 { 2486 struct ip_mc_list *im = igmp_mc_get_first(seq); 2487 if (im) 2488 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2489 --pos; 2490 return pos ? NULL : im; 2491 } 2492 2493 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2494 __acquires(rcu) 2495 { 2496 rcu_read_lock(); 2497 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2498 } 2499 2500 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2501 { 2502 struct ip_mc_list *im; 2503 if (v == SEQ_START_TOKEN) 2504 im = igmp_mc_get_first(seq); 2505 else 2506 im = igmp_mc_get_next(seq, v); 2507 ++*pos; 2508 return im; 2509 } 2510 2511 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2512 __releases(rcu) 2513 { 2514 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2515 2516 state->in_dev = NULL; 2517 state->dev = NULL; 2518 rcu_read_unlock(); 2519 } 2520 2521 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2522 { 2523 if (v == SEQ_START_TOKEN) 2524 seq_puts(seq, 2525 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2526 else { 2527 struct ip_mc_list *im = (struct ip_mc_list *)v; 2528 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2529 char *querier; 2530 long delta; 2531 2532 #ifdef CONFIG_IP_MULTICAST 2533 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2534 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2535 "V3"; 2536 #else 2537 querier = "NONE"; 2538 #endif 2539 2540 if (rcu_access_pointer(state->in_dev->mc_list) == im) { 2541 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2542 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2543 } 2544 2545 delta = im->timer.expires - jiffies; 2546 seq_printf(seq, 2547 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2548 im->multiaddr, im->users, 2549 im->tm_running, 2550 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2551 im->reporter); 2552 } 2553 return 0; 2554 } 2555 2556 static const struct seq_operations igmp_mc_seq_ops = { 2557 .start = igmp_mc_seq_start, 2558 .next = igmp_mc_seq_next, 2559 .stop = igmp_mc_seq_stop, 2560 .show = igmp_mc_seq_show, 2561 }; 2562 2563 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2564 { 2565 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2566 sizeof(struct igmp_mc_iter_state)); 2567 } 2568 2569 static const struct file_operations igmp_mc_seq_fops = { 2570 .owner = THIS_MODULE, 2571 .open = igmp_mc_seq_open, 2572 .read = seq_read, 2573 .llseek = seq_lseek, 2574 .release = seq_release_net, 2575 }; 2576 2577 struct igmp_mcf_iter_state { 2578 struct seq_net_private p; 2579 struct net_device *dev; 2580 struct in_device *idev; 2581 struct ip_mc_list *im; 2582 }; 2583 2584 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2585 2586 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2587 { 2588 struct net *net = seq_file_net(seq); 2589 struct ip_sf_list *psf = NULL; 2590 struct ip_mc_list *im = NULL; 2591 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2592 2593 state->idev = NULL; 2594 state->im = NULL; 2595 for_each_netdev_rcu(net, state->dev) { 2596 struct in_device *idev; 2597 idev = __in_dev_get_rcu(state->dev); 2598 if (unlikely(idev == NULL)) 2599 continue; 2600 im = rcu_dereference(idev->mc_list); 2601 if (likely(im != NULL)) { 2602 spin_lock_bh(&im->lock); 2603 psf = im->sources; 2604 if (likely(psf != NULL)) { 2605 state->im = im; 2606 state->idev = idev; 2607 break; 2608 } 2609 spin_unlock_bh(&im->lock); 2610 } 2611 } 2612 return psf; 2613 } 2614 2615 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2616 { 2617 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2618 2619 psf = psf->sf_next; 2620 while (!psf) { 2621 spin_unlock_bh(&state->im->lock); 2622 state->im = state->im->next; 2623 while (!state->im) { 2624 state->dev = next_net_device_rcu(state->dev); 2625 if (!state->dev) { 2626 state->idev = NULL; 2627 goto out; 2628 } 2629 state->idev = __in_dev_get_rcu(state->dev); 2630 if (!state->idev) 2631 continue; 2632 state->im = rcu_dereference(state->idev->mc_list); 2633 } 2634 if (!state->im) 2635 break; 2636 spin_lock_bh(&state->im->lock); 2637 psf = state->im->sources; 2638 } 2639 out: 2640 return psf; 2641 } 2642 2643 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2644 { 2645 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2646 if (psf) 2647 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2648 --pos; 2649 return pos ? NULL : psf; 2650 } 2651 2652 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2653 __acquires(rcu) 2654 { 2655 rcu_read_lock(); 2656 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2657 } 2658 2659 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2660 { 2661 struct ip_sf_list *psf; 2662 if (v == SEQ_START_TOKEN) 2663 psf = igmp_mcf_get_first(seq); 2664 else 2665 psf = igmp_mcf_get_next(seq, v); 2666 ++*pos; 2667 return psf; 2668 } 2669 2670 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2671 __releases(rcu) 2672 { 2673 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2674 if (likely(state->im != NULL)) { 2675 spin_unlock_bh(&state->im->lock); 2676 state->im = NULL; 2677 } 2678 state->idev = NULL; 2679 state->dev = NULL; 2680 rcu_read_unlock(); 2681 } 2682 2683 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2684 { 2685 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2686 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2687 2688 if (v == SEQ_START_TOKEN) { 2689 seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); 2690 } else { 2691 seq_printf(seq, 2692 "%3d %6.6s 0x%08x " 2693 "0x%08x %6lu %6lu\n", 2694 state->dev->ifindex, state->dev->name, 2695 ntohl(state->im->multiaddr), 2696 ntohl(psf->sf_inaddr), 2697 psf->sf_count[MCAST_INCLUDE], 2698 psf->sf_count[MCAST_EXCLUDE]); 2699 } 2700 return 0; 2701 } 2702 2703 static const struct seq_operations igmp_mcf_seq_ops = { 2704 .start = igmp_mcf_seq_start, 2705 .next = igmp_mcf_seq_next, 2706 .stop = igmp_mcf_seq_stop, 2707 .show = igmp_mcf_seq_show, 2708 }; 2709 2710 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2711 { 2712 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2713 sizeof(struct igmp_mcf_iter_state)); 2714 } 2715 2716 static const struct file_operations igmp_mcf_seq_fops = { 2717 .owner = THIS_MODULE, 2718 .open = igmp_mcf_seq_open, 2719 .read = seq_read, 2720 .llseek = seq_lseek, 2721 .release = seq_release_net, 2722 }; 2723 2724 static int __net_init igmp_net_init(struct net *net) 2725 { 2726 struct proc_dir_entry *pde; 2727 2728 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); 2729 if (!pde) 2730 goto out_igmp; 2731 pde = proc_create("mcfilter", S_IRUGO, net->proc_net, 2732 &igmp_mcf_seq_fops); 2733 if (!pde) 2734 goto out_mcfilter; 2735 return 0; 2736 2737 out_mcfilter: 2738 remove_proc_entry("igmp", net->proc_net); 2739 out_igmp: 2740 return -ENOMEM; 2741 } 2742 2743 static void __net_exit igmp_net_exit(struct net *net) 2744 { 2745 remove_proc_entry("mcfilter", net->proc_net); 2746 remove_proc_entry("igmp", net->proc_net); 2747 } 2748 2749 static struct pernet_operations igmp_net_ops = { 2750 .init = igmp_net_init, 2751 .exit = igmp_net_exit, 2752 }; 2753 #endif 2754 2755 static int igmp_netdev_event(struct notifier_block *this, 2756 unsigned long event, void *ptr) 2757 { 2758 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2759 struct in_device *in_dev; 2760 2761 switch (event) { 2762 case NETDEV_RESEND_IGMP: 2763 in_dev = __in_dev_get_rtnl(dev); 2764 if (in_dev) 2765 ip_mc_rejoin_groups(in_dev); 2766 break; 2767 default: 2768 break; 2769 } 2770 return NOTIFY_DONE; 2771 } 2772 2773 static struct notifier_block igmp_notifier = { 2774 .notifier_call = igmp_netdev_event, 2775 }; 2776 2777 int __init igmp_mc_init(void) 2778 { 2779 #if defined(CONFIG_PROC_FS) 2780 int err; 2781 2782 err = register_pernet_subsys(&igmp_net_ops); 2783 if (err) 2784 return err; 2785 err = register_netdevice_notifier(&igmp_notifier); 2786 if (err) 2787 goto reg_notif_fail; 2788 return 0; 2789 2790 reg_notif_fail: 2791 unregister_pernet_subsys(&igmp_net_ops); 2792 return err; 2793 #else 2794 return register_netdevice_notifier(&igmp_notifier); 2795 #endif 2796 } 2797