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_Unsolicited_Report_Count 2 121 122 123 #define IGMP_Initial_Report_Delay (1) 124 125 /* IGMP_Initial_Report_Delay is not from IGMP specs! 126 * IGMP specs require to report membership immediately after 127 * joining a group, but we delay the first report by a 128 * small interval. It seems more natural and still does not 129 * contradict to specs provided this delay is small enough. 130 */ 131 132 #define IGMP_V1_SEEN(in_dev) \ 133 (IPV4_DEVCONF_ALL(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 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) 322 323 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 324 { 325 struct sk_buff *skb; 326 struct rtable *rt; 327 struct iphdr *pip; 328 struct igmpv3_report *pig; 329 struct net *net = dev_net(dev); 330 struct flowi4 fl4; 331 int hlen = LL_RESERVED_SPACE(dev); 332 int tlen = dev->needed_tailroom; 333 334 while (1) { 335 skb = alloc_skb(size + hlen + tlen, 336 GFP_ATOMIC | __GFP_NOWARN); 337 if (skb) 338 break; 339 size >>= 1; 340 if (size < 256) 341 return NULL; 342 } 343 skb->priority = TC_PRIO_CONTROL; 344 igmp_skb_size(skb) = size; 345 346 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 347 0, 0, 348 IPPROTO_IGMP, 0, dev->ifindex); 349 if (IS_ERR(rt)) { 350 kfree_skb(skb); 351 return NULL; 352 } 353 354 skb_dst_set(skb, &rt->dst); 355 skb->dev = dev; 356 357 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, &rt->dst, 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)->dev ? igmp_skb_size(skb) - (skb)->len : \ 427 skb_tailroom(skb)) : 0) 428 429 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 430 int type, int gdeleted, int sdeleted) 431 { 432 struct net_device *dev = pmc->interface->dev; 433 struct igmpv3_report *pih; 434 struct igmpv3_grec *pgr = NULL; 435 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 436 int scount, stotal, first, isquery, truncate; 437 438 if (pmc->multiaddr == IGMP_ALL_HOSTS) 439 return skb; 440 441 isquery = type == IGMPV3_MODE_IS_INCLUDE || 442 type == IGMPV3_MODE_IS_EXCLUDE; 443 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 444 type == IGMPV3_CHANGE_TO_EXCLUDE; 445 446 stotal = scount = 0; 447 448 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 449 450 if (!*psf_list) 451 goto empty_source; 452 453 pih = skb ? igmpv3_report_hdr(skb) : NULL; 454 455 /* EX and TO_EX get a fresh packet, if needed */ 456 if (truncate) { 457 if (pih && pih->ngrec && 458 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 459 if (skb) 460 igmpv3_sendpack(skb); 461 skb = igmpv3_newpack(dev, dev->mtu); 462 } 463 } 464 first = 1; 465 psf_prev = NULL; 466 for (psf = *psf_list; psf; psf = psf_next) { 467 __be32 *psrc; 468 469 psf_next = psf->sf_next; 470 471 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 472 psf_prev = psf; 473 continue; 474 } 475 476 /* clear marks on query responses */ 477 if (isquery) 478 psf->sf_gsresp = 0; 479 480 if (AVAILABLE(skb) < sizeof(__be32) + 481 first*sizeof(struct igmpv3_grec)) { 482 if (truncate && !first) 483 break; /* truncate these */ 484 if (pgr) 485 pgr->grec_nsrcs = htons(scount); 486 if (skb) 487 igmpv3_sendpack(skb); 488 skb = igmpv3_newpack(dev, dev->mtu); 489 first = 1; 490 scount = 0; 491 } 492 if (first) { 493 skb = add_grhead(skb, pmc, type, &pgr); 494 first = 0; 495 } 496 if (!skb) 497 return NULL; 498 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 499 *psrc = psf->sf_inaddr; 500 scount++; stotal++; 501 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 502 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 503 psf->sf_crcount--; 504 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 505 if (psf_prev) 506 psf_prev->sf_next = psf->sf_next; 507 else 508 *psf_list = psf->sf_next; 509 kfree(psf); 510 continue; 511 } 512 } 513 psf_prev = psf; 514 } 515 516 empty_source: 517 if (!stotal) { 518 if (type == IGMPV3_ALLOW_NEW_SOURCES || 519 type == IGMPV3_BLOCK_OLD_SOURCES) 520 return skb; 521 if (pmc->crcount || isquery) { 522 /* make sure we have room for group header */ 523 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { 524 igmpv3_sendpack(skb); 525 skb = NULL; /* add_grhead will get a new one */ 526 } 527 skb = add_grhead(skb, pmc, type, &pgr); 528 } 529 } 530 if (pgr) 531 pgr->grec_nsrcs = htons(scount); 532 533 if (isquery) 534 pmc->gsquery = 0; /* clear query state on report */ 535 return skb; 536 } 537 538 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 539 { 540 struct sk_buff *skb = NULL; 541 int type; 542 543 if (!pmc) { 544 rcu_read_lock(); 545 for_each_pmc_rcu(in_dev, pmc) { 546 if (pmc->multiaddr == IGMP_ALL_HOSTS) 547 continue; 548 spin_lock_bh(&pmc->lock); 549 if (pmc->sfcount[MCAST_EXCLUDE]) 550 type = IGMPV3_MODE_IS_EXCLUDE; 551 else 552 type = IGMPV3_MODE_IS_INCLUDE; 553 skb = add_grec(skb, pmc, type, 0, 0); 554 spin_unlock_bh(&pmc->lock); 555 } 556 rcu_read_unlock(); 557 } else { 558 spin_lock_bh(&pmc->lock); 559 if (pmc->sfcount[MCAST_EXCLUDE]) 560 type = IGMPV3_MODE_IS_EXCLUDE; 561 else 562 type = IGMPV3_MODE_IS_INCLUDE; 563 skb = add_grec(skb, pmc, type, 0, 0); 564 spin_unlock_bh(&pmc->lock); 565 } 566 if (!skb) 567 return 0; 568 return igmpv3_sendpack(skb); 569 } 570 571 /* 572 * remove zero-count source records from a source filter list 573 */ 574 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 575 { 576 struct ip_sf_list *psf_prev, *psf_next, *psf; 577 578 psf_prev = NULL; 579 for (psf = *ppsf; psf; psf = psf_next) { 580 psf_next = psf->sf_next; 581 if (psf->sf_crcount == 0) { 582 if (psf_prev) 583 psf_prev->sf_next = psf->sf_next; 584 else 585 *ppsf = psf->sf_next; 586 kfree(psf); 587 } else 588 psf_prev = psf; 589 } 590 } 591 592 static void igmpv3_send_cr(struct in_device *in_dev) 593 { 594 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 595 struct sk_buff *skb = NULL; 596 int type, dtype; 597 598 rcu_read_lock(); 599 spin_lock_bh(&in_dev->mc_tomb_lock); 600 601 /* deleted MCA's */ 602 pmc_prev = NULL; 603 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { 604 pmc_next = pmc->next; 605 if (pmc->sfmode == MCAST_INCLUDE) { 606 type = IGMPV3_BLOCK_OLD_SOURCES; 607 dtype = IGMPV3_BLOCK_OLD_SOURCES; 608 skb = add_grec(skb, pmc, type, 1, 0); 609 skb = add_grec(skb, pmc, dtype, 1, 1); 610 } 611 if (pmc->crcount) { 612 if (pmc->sfmode == MCAST_EXCLUDE) { 613 type = IGMPV3_CHANGE_TO_INCLUDE; 614 skb = add_grec(skb, pmc, type, 1, 0); 615 } 616 pmc->crcount--; 617 if (pmc->crcount == 0) { 618 igmpv3_clear_zeros(&pmc->tomb); 619 igmpv3_clear_zeros(&pmc->sources); 620 } 621 } 622 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 623 if (pmc_prev) 624 pmc_prev->next = pmc_next; 625 else 626 in_dev->mc_tomb = pmc_next; 627 in_dev_put(pmc->interface); 628 kfree(pmc); 629 } else 630 pmc_prev = pmc; 631 } 632 spin_unlock_bh(&in_dev->mc_tomb_lock); 633 634 /* change recs */ 635 for_each_pmc_rcu(in_dev, pmc) { 636 spin_lock_bh(&pmc->lock); 637 if (pmc->sfcount[MCAST_EXCLUDE]) { 638 type = IGMPV3_BLOCK_OLD_SOURCES; 639 dtype = IGMPV3_ALLOW_NEW_SOURCES; 640 } else { 641 type = IGMPV3_ALLOW_NEW_SOURCES; 642 dtype = IGMPV3_BLOCK_OLD_SOURCES; 643 } 644 skb = add_grec(skb, pmc, type, 0, 0); 645 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 646 647 /* filter mode changes */ 648 if (pmc->crcount) { 649 if (pmc->sfmode == MCAST_EXCLUDE) 650 type = IGMPV3_CHANGE_TO_EXCLUDE; 651 else 652 type = IGMPV3_CHANGE_TO_INCLUDE; 653 skb = add_grec(skb, pmc, type, 0, 0); 654 pmc->crcount--; 655 } 656 spin_unlock_bh(&pmc->lock); 657 } 658 rcu_read_unlock(); 659 660 if (!skb) 661 return; 662 (void) igmpv3_sendpack(skb); 663 } 664 665 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 666 int type) 667 { 668 struct sk_buff *skb; 669 struct iphdr *iph; 670 struct igmphdr *ih; 671 struct rtable *rt; 672 struct net_device *dev = in_dev->dev; 673 struct net *net = dev_net(dev); 674 __be32 group = pmc ? pmc->multiaddr : 0; 675 struct flowi4 fl4; 676 __be32 dst; 677 int hlen, tlen; 678 679 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 680 return igmpv3_send_report(in_dev, pmc); 681 else if (type == IGMP_HOST_LEAVE_MESSAGE) 682 dst = IGMP_ALL_ROUTER; 683 else 684 dst = group; 685 686 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 687 0, 0, 688 IPPROTO_IGMP, 0, dev->ifindex); 689 if (IS_ERR(rt)) 690 return -1; 691 692 hlen = LL_RESERVED_SPACE(dev); 693 tlen = dev->needed_tailroom; 694 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 695 if (skb == NULL) { 696 ip_rt_put(rt); 697 return -1; 698 } 699 skb->priority = TC_PRIO_CONTROL; 700 701 skb_dst_set(skb, &rt->dst); 702 703 skb_reserve(skb, hlen); 704 705 skb_reset_network_header(skb); 706 iph = ip_hdr(skb); 707 skb_put(skb, sizeof(struct iphdr) + 4); 708 709 iph->version = 4; 710 iph->ihl = (sizeof(struct iphdr)+4)>>2; 711 iph->tos = 0xc0; 712 iph->frag_off = htons(IP_DF); 713 iph->ttl = 1; 714 iph->daddr = dst; 715 iph->saddr = fl4.saddr; 716 iph->protocol = IPPROTO_IGMP; 717 ip_select_ident(skb, &rt->dst, NULL); 718 ((u8 *)&iph[1])[0] = IPOPT_RA; 719 ((u8 *)&iph[1])[1] = 4; 720 ((u8 *)&iph[1])[2] = 0; 721 ((u8 *)&iph[1])[3] = 0; 722 723 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 724 ih->type = type; 725 ih->code = 0; 726 ih->csum = 0; 727 ih->group = group; 728 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 729 730 return ip_local_out(skb); 731 } 732 733 static void igmp_gq_timer_expire(unsigned long data) 734 { 735 struct in_device *in_dev = (struct in_device *)data; 736 737 in_dev->mr_gq_running = 0; 738 igmpv3_send_report(in_dev, NULL); 739 in_dev_put(in_dev); 740 } 741 742 static void igmp_ifc_timer_expire(unsigned long data) 743 { 744 struct in_device *in_dev = (struct in_device *)data; 745 746 igmpv3_send_cr(in_dev); 747 if (in_dev->mr_ifc_count) { 748 in_dev->mr_ifc_count--; 749 igmp_ifc_start_timer(in_dev, 750 unsolicited_report_interval(in_dev)); 751 } 752 in_dev_put(in_dev); 753 } 754 755 static void igmp_ifc_event(struct in_device *in_dev) 756 { 757 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 758 return; 759 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 760 IGMP_Unsolicited_Report_Count; 761 igmp_ifc_start_timer(in_dev, 1); 762 } 763 764 765 static void igmp_timer_expire(unsigned long data) 766 { 767 struct ip_mc_list *im = (struct ip_mc_list *)data; 768 struct in_device *in_dev = im->interface; 769 770 spin_lock(&im->lock); 771 im->tm_running = 0; 772 773 if (im->unsolicit_count) { 774 im->unsolicit_count--; 775 igmp_start_timer(im, unsolicited_report_interval(in_dev)); 776 } 777 im->reporter = 1; 778 spin_unlock(&im->lock); 779 780 if (IGMP_V1_SEEN(in_dev)) 781 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 782 else if (IGMP_V2_SEEN(in_dev)) 783 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 784 else 785 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 786 787 ip_ma_put(im); 788 } 789 790 /* mark EXCLUDE-mode sources */ 791 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 792 { 793 struct ip_sf_list *psf; 794 int i, scount; 795 796 scount = 0; 797 for (psf = pmc->sources; psf; psf = psf->sf_next) { 798 if (scount == nsrcs) 799 break; 800 for (i = 0; i < nsrcs; i++) { 801 /* skip inactive filters */ 802 if (psf->sf_count[MCAST_INCLUDE] || 803 pmc->sfcount[MCAST_EXCLUDE] != 804 psf->sf_count[MCAST_EXCLUDE]) 805 break; 806 if (srcs[i] == psf->sf_inaddr) { 807 scount++; 808 break; 809 } 810 } 811 } 812 pmc->gsquery = 0; 813 if (scount == nsrcs) /* all sources excluded */ 814 return 0; 815 return 1; 816 } 817 818 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 819 { 820 struct ip_sf_list *psf; 821 int i, scount; 822 823 if (pmc->sfmode == MCAST_EXCLUDE) 824 return igmp_xmarksources(pmc, nsrcs, srcs); 825 826 /* mark INCLUDE-mode sources */ 827 scount = 0; 828 for (psf = pmc->sources; psf; psf = psf->sf_next) { 829 if (scount == nsrcs) 830 break; 831 for (i = 0; i < nsrcs; i++) 832 if (srcs[i] == psf->sf_inaddr) { 833 psf->sf_gsresp = 1; 834 scount++; 835 break; 836 } 837 } 838 if (!scount) { 839 pmc->gsquery = 0; 840 return 0; 841 } 842 pmc->gsquery = 1; 843 return 1; 844 } 845 846 /* return true if packet was dropped */ 847 static bool igmp_heard_report(struct in_device *in_dev, __be32 group) 848 { 849 struct ip_mc_list *im; 850 851 /* Timers are only set for non-local groups */ 852 853 if (group == IGMP_ALL_HOSTS) 854 return false; 855 856 rcu_read_lock(); 857 for_each_pmc_rcu(in_dev, im) { 858 if (im->multiaddr == group) { 859 igmp_stop_timer(im); 860 break; 861 } 862 } 863 rcu_read_unlock(); 864 return false; 865 } 866 867 /* return true if packet was dropped */ 868 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 869 int len) 870 { 871 struct igmphdr *ih = igmp_hdr(skb); 872 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 873 struct ip_mc_list *im; 874 __be32 group = ih->group; 875 int max_delay; 876 int mark = 0; 877 878 879 if (len == 8) { 880 if (ih->code == 0) { 881 /* Alas, old v1 router presents here. */ 882 883 max_delay = IGMP_Query_Response_Interval; 884 in_dev->mr_v1_seen = jiffies + 885 IGMP_V1_Router_Present_Timeout; 886 group = 0; 887 } else { 888 /* v2 router present */ 889 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 890 in_dev->mr_v2_seen = jiffies + 891 IGMP_V2_Router_Present_Timeout; 892 } 893 /* cancel the interface change timer */ 894 in_dev->mr_ifc_count = 0; 895 if (del_timer(&in_dev->mr_ifc_timer)) 896 __in_dev_put(in_dev); 897 /* clear deleted report items */ 898 igmpv3_clear_delrec(in_dev); 899 } else if (len < 12) { 900 return true; /* ignore bogus packet; freed by caller */ 901 } else if (IGMP_V1_SEEN(in_dev)) { 902 /* This is a v3 query with v1 queriers present */ 903 max_delay = IGMP_Query_Response_Interval; 904 group = 0; 905 } else if (IGMP_V2_SEEN(in_dev)) { 906 /* this is a v3 query with v2 queriers present; 907 * Interpretation of the max_delay code is problematic here. 908 * A real v2 host would use ih_code directly, while v3 has a 909 * different encoding. We use the v3 encoding as more likely 910 * to be intended in a v3 query. 911 */ 912 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 913 if (!max_delay) 914 max_delay = 1; /* can't mod w/ 0 */ 915 } else { /* v3 */ 916 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 917 return true; 918 919 ih3 = igmpv3_query_hdr(skb); 920 if (ih3->nsrcs) { 921 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 922 + ntohs(ih3->nsrcs)*sizeof(__be32))) 923 return true; 924 ih3 = igmpv3_query_hdr(skb); 925 } 926 927 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 928 if (!max_delay) 929 max_delay = 1; /* can't mod w/ 0 */ 930 in_dev->mr_maxdelay = max_delay; 931 if (ih3->qrv) 932 in_dev->mr_qrv = ih3->qrv; 933 if (!group) { /* general query */ 934 if (ih3->nsrcs) 935 return false; /* no sources allowed */ 936 igmp_gq_start_timer(in_dev); 937 return false; 938 } 939 /* mark sources to include, if group & source-specific */ 940 mark = ih3->nsrcs != 0; 941 } 942 943 /* 944 * - Start the timers in all of our membership records 945 * that the query applies to for the interface on 946 * which the query arrived excl. those that belong 947 * to a "local" group (224.0.0.X) 948 * - For timers already running check if they need to 949 * be reset. 950 * - Use the igmp->igmp_code field as the maximum 951 * delay possible 952 */ 953 rcu_read_lock(); 954 for_each_pmc_rcu(in_dev, im) { 955 int changed; 956 957 if (group && group != im->multiaddr) 958 continue; 959 if (im->multiaddr == IGMP_ALL_HOSTS) 960 continue; 961 spin_lock_bh(&im->lock); 962 if (im->tm_running) 963 im->gsquery = im->gsquery && mark; 964 else 965 im->gsquery = mark; 966 changed = !im->gsquery || 967 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 968 spin_unlock_bh(&im->lock); 969 if (changed) 970 igmp_mod_timer(im, max_delay); 971 } 972 rcu_read_unlock(); 973 return false; 974 } 975 976 /* called in rcu_read_lock() section */ 977 int igmp_rcv(struct sk_buff *skb) 978 { 979 /* This basically follows the spec line by line -- see RFC1112 */ 980 struct igmphdr *ih; 981 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 982 int len = skb->len; 983 bool dropped = true; 984 985 if (in_dev == NULL) 986 goto drop; 987 988 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 989 goto drop; 990 991 switch (skb->ip_summed) { 992 case CHECKSUM_COMPLETE: 993 if (!csum_fold(skb->csum)) 994 break; 995 /* fall through */ 996 case CHECKSUM_NONE: 997 skb->csum = 0; 998 if (__skb_checksum_complete(skb)) 999 goto drop; 1000 } 1001 1002 ih = igmp_hdr(skb); 1003 switch (ih->type) { 1004 case IGMP_HOST_MEMBERSHIP_QUERY: 1005 dropped = igmp_heard_query(in_dev, skb, len); 1006 break; 1007 case IGMP_HOST_MEMBERSHIP_REPORT: 1008 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1009 /* Is it our report looped back? */ 1010 if (rt_is_output_route(skb_rtable(skb))) 1011 break; 1012 /* don't rely on MC router hearing unicast reports */ 1013 if (skb->pkt_type == PACKET_MULTICAST || 1014 skb->pkt_type == PACKET_BROADCAST) 1015 dropped = igmp_heard_report(in_dev, ih->group); 1016 break; 1017 case IGMP_PIM: 1018 #ifdef CONFIG_IP_PIMSM_V1 1019 return pim_rcv_v1(skb); 1020 #endif 1021 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1022 case IGMP_DVMRP: 1023 case IGMP_TRACE: 1024 case IGMP_HOST_LEAVE_MESSAGE: 1025 case IGMP_MTRACE: 1026 case IGMP_MTRACE_RESP: 1027 break; 1028 default: 1029 break; 1030 } 1031 1032 drop: 1033 if (dropped) 1034 kfree_skb(skb); 1035 else 1036 consume_skb(skb); 1037 return 0; 1038 } 1039 1040 #endif 1041 1042 1043 /* 1044 * Add a filter to a device 1045 */ 1046 1047 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1048 { 1049 char buf[MAX_ADDR_LEN]; 1050 struct net_device *dev = in_dev->dev; 1051 1052 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1053 We will get multicast token leakage, when IFF_MULTICAST 1054 is changed. This check should be done in ndo_set_rx_mode 1055 routine. Something sort of: 1056 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1057 --ANK 1058 */ 1059 if (arp_mc_map(addr, buf, dev, 0) == 0) 1060 dev_mc_add(dev, buf); 1061 } 1062 1063 /* 1064 * Remove a filter from a device 1065 */ 1066 1067 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1068 { 1069 char buf[MAX_ADDR_LEN]; 1070 struct net_device *dev = in_dev->dev; 1071 1072 if (arp_mc_map(addr, buf, dev, 0) == 0) 1073 dev_mc_del(dev, buf); 1074 } 1075 1076 #ifdef CONFIG_IP_MULTICAST 1077 /* 1078 * deleted ip_mc_list manipulation 1079 */ 1080 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1081 { 1082 struct ip_mc_list *pmc; 1083 1084 /* this is an "ip_mc_list" for convenience; only the fields below 1085 * are actually used. In particular, the refcnt and users are not 1086 * used for management of the delete list. Using the same structure 1087 * for deleted items allows change reports to use common code with 1088 * non-deleted or query-response MCA's. 1089 */ 1090 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1091 if (!pmc) 1092 return; 1093 spin_lock_bh(&im->lock); 1094 pmc->interface = im->interface; 1095 in_dev_hold(in_dev); 1096 pmc->multiaddr = im->multiaddr; 1097 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1098 IGMP_Unsolicited_Report_Count; 1099 pmc->sfmode = im->sfmode; 1100 if (pmc->sfmode == MCAST_INCLUDE) { 1101 struct ip_sf_list *psf; 1102 1103 pmc->tomb = im->tomb; 1104 pmc->sources = im->sources; 1105 im->tomb = im->sources = NULL; 1106 for (psf = pmc->sources; psf; psf = psf->sf_next) 1107 psf->sf_crcount = pmc->crcount; 1108 } 1109 spin_unlock_bh(&im->lock); 1110 1111 spin_lock_bh(&in_dev->mc_tomb_lock); 1112 pmc->next = in_dev->mc_tomb; 1113 in_dev->mc_tomb = pmc; 1114 spin_unlock_bh(&in_dev->mc_tomb_lock); 1115 } 1116 1117 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1118 { 1119 struct ip_mc_list *pmc, *pmc_prev; 1120 struct ip_sf_list *psf, *psf_next; 1121 1122 spin_lock_bh(&in_dev->mc_tomb_lock); 1123 pmc_prev = NULL; 1124 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1125 if (pmc->multiaddr == multiaddr) 1126 break; 1127 pmc_prev = pmc; 1128 } 1129 if (pmc) { 1130 if (pmc_prev) 1131 pmc_prev->next = pmc->next; 1132 else 1133 in_dev->mc_tomb = pmc->next; 1134 } 1135 spin_unlock_bh(&in_dev->mc_tomb_lock); 1136 if (pmc) { 1137 for (psf = pmc->tomb; psf; psf = psf_next) { 1138 psf_next = psf->sf_next; 1139 kfree(psf); 1140 } 1141 in_dev_put(pmc->interface); 1142 kfree(pmc); 1143 } 1144 } 1145 1146 static void igmpv3_clear_delrec(struct in_device *in_dev) 1147 { 1148 struct ip_mc_list *pmc, *nextpmc; 1149 1150 spin_lock_bh(&in_dev->mc_tomb_lock); 1151 pmc = in_dev->mc_tomb; 1152 in_dev->mc_tomb = NULL; 1153 spin_unlock_bh(&in_dev->mc_tomb_lock); 1154 1155 for (; pmc; pmc = nextpmc) { 1156 nextpmc = pmc->next; 1157 ip_mc_clear_src(pmc); 1158 in_dev_put(pmc->interface); 1159 kfree(pmc); 1160 } 1161 /* clear dead sources, too */ 1162 rcu_read_lock(); 1163 for_each_pmc_rcu(in_dev, pmc) { 1164 struct ip_sf_list *psf, *psf_next; 1165 1166 spin_lock_bh(&pmc->lock); 1167 psf = pmc->tomb; 1168 pmc->tomb = NULL; 1169 spin_unlock_bh(&pmc->lock); 1170 for (; psf; psf = psf_next) { 1171 psf_next = psf->sf_next; 1172 kfree(psf); 1173 } 1174 } 1175 rcu_read_unlock(); 1176 } 1177 #endif 1178 1179 static void igmp_group_dropped(struct ip_mc_list *im) 1180 { 1181 struct in_device *in_dev = im->interface; 1182 #ifdef CONFIG_IP_MULTICAST 1183 int reporter; 1184 #endif 1185 1186 if (im->loaded) { 1187 im->loaded = 0; 1188 ip_mc_filter_del(in_dev, im->multiaddr); 1189 } 1190 1191 #ifdef CONFIG_IP_MULTICAST 1192 if (im->multiaddr == IGMP_ALL_HOSTS) 1193 return; 1194 1195 reporter = im->reporter; 1196 igmp_stop_timer(im); 1197 1198 if (!in_dev->dead) { 1199 if (IGMP_V1_SEEN(in_dev)) 1200 return; 1201 if (IGMP_V2_SEEN(in_dev)) { 1202 if (reporter) 1203 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1204 return; 1205 } 1206 /* IGMPv3 */ 1207 igmpv3_add_delrec(in_dev, im); 1208 1209 igmp_ifc_event(in_dev); 1210 } 1211 #endif 1212 } 1213 1214 static void igmp_group_added(struct ip_mc_list *im) 1215 { 1216 struct in_device *in_dev = im->interface; 1217 1218 if (im->loaded == 0) { 1219 im->loaded = 1; 1220 ip_mc_filter_add(in_dev, im->multiaddr); 1221 } 1222 1223 #ifdef CONFIG_IP_MULTICAST 1224 if (im->multiaddr == IGMP_ALL_HOSTS) 1225 return; 1226 1227 if (in_dev->dead) 1228 return; 1229 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1230 spin_lock_bh(&im->lock); 1231 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1232 spin_unlock_bh(&im->lock); 1233 return; 1234 } 1235 /* else, v3 */ 1236 1237 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1238 IGMP_Unsolicited_Report_Count; 1239 igmp_ifc_event(in_dev); 1240 #endif 1241 } 1242 1243 1244 /* 1245 * Multicast list managers 1246 */ 1247 1248 static u32 ip_mc_hash(const struct ip_mc_list *im) 1249 { 1250 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1251 } 1252 1253 static void ip_mc_hash_add(struct in_device *in_dev, 1254 struct ip_mc_list *im) 1255 { 1256 struct ip_mc_list __rcu **mc_hash; 1257 u32 hash; 1258 1259 mc_hash = rtnl_dereference(in_dev->mc_hash); 1260 if (mc_hash) { 1261 hash = ip_mc_hash(im); 1262 im->next_hash = mc_hash[hash]; 1263 rcu_assign_pointer(mc_hash[hash], im); 1264 return; 1265 } 1266 1267 /* do not use a hash table for small number of items */ 1268 if (in_dev->mc_count < 4) 1269 return; 1270 1271 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1272 GFP_KERNEL); 1273 if (!mc_hash) 1274 return; 1275 1276 for_each_pmc_rtnl(in_dev, im) { 1277 hash = ip_mc_hash(im); 1278 im->next_hash = mc_hash[hash]; 1279 RCU_INIT_POINTER(mc_hash[hash], im); 1280 } 1281 1282 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1283 } 1284 1285 static void ip_mc_hash_remove(struct in_device *in_dev, 1286 struct ip_mc_list *im) 1287 { 1288 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1289 struct ip_mc_list *aux; 1290 1291 if (!mc_hash) 1292 return; 1293 mc_hash += ip_mc_hash(im); 1294 while ((aux = rtnl_dereference(*mc_hash)) != im) 1295 mc_hash = &aux->next_hash; 1296 *mc_hash = im->next_hash; 1297 } 1298 1299 1300 /* 1301 * A socket has joined a multicast group on device dev. 1302 */ 1303 1304 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1305 { 1306 struct ip_mc_list *im; 1307 1308 ASSERT_RTNL(); 1309 1310 for_each_pmc_rtnl(in_dev, im) { 1311 if (im->multiaddr == addr) { 1312 im->users++; 1313 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1314 goto out; 1315 } 1316 } 1317 1318 im = kzalloc(sizeof(*im), GFP_KERNEL); 1319 if (!im) 1320 goto out; 1321 1322 im->users = 1; 1323 im->interface = in_dev; 1324 in_dev_hold(in_dev); 1325 im->multiaddr = addr; 1326 /* initial mode is (EX, empty) */ 1327 im->sfmode = MCAST_EXCLUDE; 1328 im->sfcount[MCAST_EXCLUDE] = 1; 1329 atomic_set(&im->refcnt, 1); 1330 spin_lock_init(&im->lock); 1331 #ifdef CONFIG_IP_MULTICAST 1332 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1333 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1334 #endif 1335 1336 im->next_rcu = in_dev->mc_list; 1337 in_dev->mc_count++; 1338 rcu_assign_pointer(in_dev->mc_list, im); 1339 1340 ip_mc_hash_add(in_dev, im); 1341 1342 #ifdef CONFIG_IP_MULTICAST 1343 igmpv3_del_delrec(in_dev, im->multiaddr); 1344 #endif 1345 igmp_group_added(im); 1346 if (!in_dev->dead) 1347 ip_rt_multicast_event(in_dev); 1348 out: 1349 return; 1350 } 1351 EXPORT_SYMBOL(ip_mc_inc_group); 1352 1353 /* 1354 * Resend IGMP JOIN report; used by netdev notifier. 1355 */ 1356 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1357 { 1358 #ifdef CONFIG_IP_MULTICAST 1359 struct ip_mc_list *im; 1360 int type; 1361 1362 ASSERT_RTNL(); 1363 1364 for_each_pmc_rtnl(in_dev, im) { 1365 if (im->multiaddr == IGMP_ALL_HOSTS) 1366 continue; 1367 1368 /* a failover is happening and switches 1369 * must be notified immediately 1370 */ 1371 if (IGMP_V1_SEEN(in_dev)) 1372 type = IGMP_HOST_MEMBERSHIP_REPORT; 1373 else if (IGMP_V2_SEEN(in_dev)) 1374 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1375 else 1376 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1377 igmp_send_report(in_dev, im, type); 1378 } 1379 #endif 1380 } 1381 1382 /* 1383 * A socket has left a multicast group on device dev 1384 */ 1385 1386 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1387 { 1388 struct ip_mc_list *i; 1389 struct ip_mc_list __rcu **ip; 1390 1391 ASSERT_RTNL(); 1392 1393 for (ip = &in_dev->mc_list; 1394 (i = rtnl_dereference(*ip)) != NULL; 1395 ip = &i->next_rcu) { 1396 if (i->multiaddr == addr) { 1397 if (--i->users == 0) { 1398 ip_mc_hash_remove(in_dev, i); 1399 *ip = i->next_rcu; 1400 in_dev->mc_count--; 1401 igmp_group_dropped(i); 1402 ip_mc_clear_src(i); 1403 1404 if (!in_dev->dead) 1405 ip_rt_multicast_event(in_dev); 1406 1407 ip_ma_put(i); 1408 return; 1409 } 1410 break; 1411 } 1412 } 1413 } 1414 EXPORT_SYMBOL(ip_mc_dec_group); 1415 1416 /* Device changing type */ 1417 1418 void ip_mc_unmap(struct in_device *in_dev) 1419 { 1420 struct ip_mc_list *pmc; 1421 1422 ASSERT_RTNL(); 1423 1424 for_each_pmc_rtnl(in_dev, pmc) 1425 igmp_group_dropped(pmc); 1426 } 1427 1428 void ip_mc_remap(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_added(pmc); 1436 } 1437 1438 /* Device going down */ 1439 1440 void ip_mc_down(struct in_device *in_dev) 1441 { 1442 struct ip_mc_list *pmc; 1443 1444 ASSERT_RTNL(); 1445 1446 for_each_pmc_rtnl(in_dev, pmc) 1447 igmp_group_dropped(pmc); 1448 1449 #ifdef CONFIG_IP_MULTICAST 1450 in_dev->mr_ifc_count = 0; 1451 if (del_timer(&in_dev->mr_ifc_timer)) 1452 __in_dev_put(in_dev); 1453 in_dev->mr_gq_running = 0; 1454 if (del_timer(&in_dev->mr_gq_timer)) 1455 __in_dev_put(in_dev); 1456 igmpv3_clear_delrec(in_dev); 1457 #endif 1458 1459 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1460 } 1461 1462 void ip_mc_init_dev(struct in_device *in_dev) 1463 { 1464 ASSERT_RTNL(); 1465 1466 #ifdef CONFIG_IP_MULTICAST 1467 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1468 (unsigned long)in_dev); 1469 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1470 (unsigned long)in_dev); 1471 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1472 #endif 1473 1474 spin_lock_init(&in_dev->mc_tomb_lock); 1475 } 1476 1477 /* Device going up */ 1478 1479 void ip_mc_up(struct in_device *in_dev) 1480 { 1481 struct ip_mc_list *pmc; 1482 1483 ASSERT_RTNL(); 1484 1485 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1486 1487 for_each_pmc_rtnl(in_dev, pmc) 1488 igmp_group_added(pmc); 1489 } 1490 1491 /* 1492 * Device is about to be destroyed: clean up. 1493 */ 1494 1495 void ip_mc_destroy_dev(struct in_device *in_dev) 1496 { 1497 struct ip_mc_list *i; 1498 1499 ASSERT_RTNL(); 1500 1501 /* Deactivate timers */ 1502 ip_mc_down(in_dev); 1503 1504 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1505 in_dev->mc_list = i->next_rcu; 1506 in_dev->mc_count--; 1507 1508 /* We've dropped the groups in ip_mc_down already */ 1509 ip_mc_clear_src(i); 1510 ip_ma_put(i); 1511 } 1512 } 1513 1514 /* RTNL is locked */ 1515 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1516 { 1517 struct net_device *dev = NULL; 1518 struct in_device *idev = NULL; 1519 1520 if (imr->imr_ifindex) { 1521 idev = inetdev_by_index(net, imr->imr_ifindex); 1522 return idev; 1523 } 1524 if (imr->imr_address.s_addr) { 1525 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1526 if (!dev) 1527 return NULL; 1528 } 1529 1530 if (!dev) { 1531 struct rtable *rt = ip_route_output(net, 1532 imr->imr_multiaddr.s_addr, 1533 0, 0, 0); 1534 if (!IS_ERR(rt)) { 1535 dev = rt->dst.dev; 1536 ip_rt_put(rt); 1537 } 1538 } 1539 if (dev) { 1540 imr->imr_ifindex = dev->ifindex; 1541 idev = __in_dev_get_rtnl(dev); 1542 } 1543 return idev; 1544 } 1545 1546 /* 1547 * Join a socket to a group 1548 */ 1549 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1550 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1551 1552 1553 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1554 __be32 *psfsrc) 1555 { 1556 struct ip_sf_list *psf, *psf_prev; 1557 int rv = 0; 1558 1559 psf_prev = NULL; 1560 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1561 if (psf->sf_inaddr == *psfsrc) 1562 break; 1563 psf_prev = psf; 1564 } 1565 if (!psf || psf->sf_count[sfmode] == 0) { 1566 /* source filter not found, or count wrong => bug */ 1567 return -ESRCH; 1568 } 1569 psf->sf_count[sfmode]--; 1570 if (psf->sf_count[sfmode] == 0) { 1571 ip_rt_multicast_event(pmc->interface); 1572 } 1573 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1574 #ifdef CONFIG_IP_MULTICAST 1575 struct in_device *in_dev = pmc->interface; 1576 #endif 1577 1578 /* no more filters for this source */ 1579 if (psf_prev) 1580 psf_prev->sf_next = psf->sf_next; 1581 else 1582 pmc->sources = psf->sf_next; 1583 #ifdef CONFIG_IP_MULTICAST 1584 if (psf->sf_oldin && 1585 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1586 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1587 IGMP_Unsolicited_Report_Count; 1588 psf->sf_next = pmc->tomb; 1589 pmc->tomb = psf; 1590 rv = 1; 1591 } else 1592 #endif 1593 kfree(psf); 1594 } 1595 return rv; 1596 } 1597 1598 #ifndef CONFIG_IP_MULTICAST 1599 #define igmp_ifc_event(x) do { } while (0) 1600 #endif 1601 1602 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1603 int sfcount, __be32 *psfsrc, int delta) 1604 { 1605 struct ip_mc_list *pmc; 1606 int changerec = 0; 1607 int i, err; 1608 1609 if (!in_dev) 1610 return -ENODEV; 1611 rcu_read_lock(); 1612 for_each_pmc_rcu(in_dev, pmc) { 1613 if (*pmca == pmc->multiaddr) 1614 break; 1615 } 1616 if (!pmc) { 1617 /* MCA not found?? bug */ 1618 rcu_read_unlock(); 1619 return -ESRCH; 1620 } 1621 spin_lock_bh(&pmc->lock); 1622 rcu_read_unlock(); 1623 #ifdef CONFIG_IP_MULTICAST 1624 sf_markstate(pmc); 1625 #endif 1626 if (!delta) { 1627 err = -EINVAL; 1628 if (!pmc->sfcount[sfmode]) 1629 goto out_unlock; 1630 pmc->sfcount[sfmode]--; 1631 } 1632 err = 0; 1633 for (i = 0; i < sfcount; i++) { 1634 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1635 1636 changerec |= rv > 0; 1637 if (!err && rv < 0) 1638 err = rv; 1639 } 1640 if (pmc->sfmode == MCAST_EXCLUDE && 1641 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1642 pmc->sfcount[MCAST_INCLUDE]) { 1643 #ifdef CONFIG_IP_MULTICAST 1644 struct ip_sf_list *psf; 1645 #endif 1646 1647 /* filter mode change */ 1648 pmc->sfmode = MCAST_INCLUDE; 1649 #ifdef CONFIG_IP_MULTICAST 1650 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1651 IGMP_Unsolicited_Report_Count; 1652 in_dev->mr_ifc_count = pmc->crcount; 1653 for (psf = pmc->sources; psf; psf = psf->sf_next) 1654 psf->sf_crcount = 0; 1655 igmp_ifc_event(pmc->interface); 1656 } else if (sf_setstate(pmc) || changerec) { 1657 igmp_ifc_event(pmc->interface); 1658 #endif 1659 } 1660 out_unlock: 1661 spin_unlock_bh(&pmc->lock); 1662 return err; 1663 } 1664 1665 /* 1666 * Add multicast single-source filter to the interface list 1667 */ 1668 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1669 __be32 *psfsrc) 1670 { 1671 struct ip_sf_list *psf, *psf_prev; 1672 1673 psf_prev = NULL; 1674 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1675 if (psf->sf_inaddr == *psfsrc) 1676 break; 1677 psf_prev = psf; 1678 } 1679 if (!psf) { 1680 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1681 if (!psf) 1682 return -ENOBUFS; 1683 psf->sf_inaddr = *psfsrc; 1684 if (psf_prev) { 1685 psf_prev->sf_next = psf; 1686 } else 1687 pmc->sources = psf; 1688 } 1689 psf->sf_count[sfmode]++; 1690 if (psf->sf_count[sfmode] == 1) { 1691 ip_rt_multicast_event(pmc->interface); 1692 } 1693 return 0; 1694 } 1695 1696 #ifdef CONFIG_IP_MULTICAST 1697 static void sf_markstate(struct ip_mc_list *pmc) 1698 { 1699 struct ip_sf_list *psf; 1700 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1701 1702 for (psf = pmc->sources; psf; psf = psf->sf_next) 1703 if (pmc->sfcount[MCAST_EXCLUDE]) { 1704 psf->sf_oldin = mca_xcount == 1705 psf->sf_count[MCAST_EXCLUDE] && 1706 !psf->sf_count[MCAST_INCLUDE]; 1707 } else 1708 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1709 } 1710 1711 static int sf_setstate(struct ip_mc_list *pmc) 1712 { 1713 struct ip_sf_list *psf, *dpsf; 1714 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1715 int qrv = pmc->interface->mr_qrv; 1716 int new_in, rv; 1717 1718 rv = 0; 1719 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1720 if (pmc->sfcount[MCAST_EXCLUDE]) { 1721 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1722 !psf->sf_count[MCAST_INCLUDE]; 1723 } else 1724 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1725 if (new_in) { 1726 if (!psf->sf_oldin) { 1727 struct ip_sf_list *prev = NULL; 1728 1729 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 1730 if (dpsf->sf_inaddr == psf->sf_inaddr) 1731 break; 1732 prev = dpsf; 1733 } 1734 if (dpsf) { 1735 if (prev) 1736 prev->sf_next = dpsf->sf_next; 1737 else 1738 pmc->tomb = dpsf->sf_next; 1739 kfree(dpsf); 1740 } 1741 psf->sf_crcount = qrv; 1742 rv++; 1743 } 1744 } else if (psf->sf_oldin) { 1745 1746 psf->sf_crcount = 0; 1747 /* 1748 * add or update "delete" records if an active filter 1749 * is now inactive 1750 */ 1751 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 1752 if (dpsf->sf_inaddr == psf->sf_inaddr) 1753 break; 1754 if (!dpsf) { 1755 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1756 if (!dpsf) 1757 continue; 1758 *dpsf = *psf; 1759 /* pmc->lock held by callers */ 1760 dpsf->sf_next = pmc->tomb; 1761 pmc->tomb = dpsf; 1762 } 1763 dpsf->sf_crcount = qrv; 1764 rv++; 1765 } 1766 } 1767 return rv; 1768 } 1769 #endif 1770 1771 /* 1772 * Add multicast source filter list to the interface list 1773 */ 1774 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1775 int sfcount, __be32 *psfsrc, int delta) 1776 { 1777 struct ip_mc_list *pmc; 1778 int isexclude; 1779 int i, err; 1780 1781 if (!in_dev) 1782 return -ENODEV; 1783 rcu_read_lock(); 1784 for_each_pmc_rcu(in_dev, pmc) { 1785 if (*pmca == pmc->multiaddr) 1786 break; 1787 } 1788 if (!pmc) { 1789 /* MCA not found?? bug */ 1790 rcu_read_unlock(); 1791 return -ESRCH; 1792 } 1793 spin_lock_bh(&pmc->lock); 1794 rcu_read_unlock(); 1795 1796 #ifdef CONFIG_IP_MULTICAST 1797 sf_markstate(pmc); 1798 #endif 1799 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1800 if (!delta) 1801 pmc->sfcount[sfmode]++; 1802 err = 0; 1803 for (i = 0; i < sfcount; i++) { 1804 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1805 if (err) 1806 break; 1807 } 1808 if (err) { 1809 int j; 1810 1811 if (!delta) 1812 pmc->sfcount[sfmode]--; 1813 for (j = 0; j < i; j++) 1814 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1815 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1816 #ifdef CONFIG_IP_MULTICAST 1817 struct ip_sf_list *psf; 1818 in_dev = pmc->interface; 1819 #endif 1820 1821 /* filter mode change */ 1822 if (pmc->sfcount[MCAST_EXCLUDE]) 1823 pmc->sfmode = MCAST_EXCLUDE; 1824 else if (pmc->sfcount[MCAST_INCLUDE]) 1825 pmc->sfmode = MCAST_INCLUDE; 1826 #ifdef CONFIG_IP_MULTICAST 1827 /* else no filters; keep old mode for reports */ 1828 1829 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1830 IGMP_Unsolicited_Report_Count; 1831 in_dev->mr_ifc_count = pmc->crcount; 1832 for (psf = pmc->sources; psf; psf = psf->sf_next) 1833 psf->sf_crcount = 0; 1834 igmp_ifc_event(in_dev); 1835 } else if (sf_setstate(pmc)) { 1836 igmp_ifc_event(in_dev); 1837 #endif 1838 } 1839 spin_unlock_bh(&pmc->lock); 1840 return err; 1841 } 1842 1843 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1844 { 1845 struct ip_sf_list *psf, *nextpsf; 1846 1847 for (psf = pmc->tomb; psf; psf = nextpsf) { 1848 nextpsf = psf->sf_next; 1849 kfree(psf); 1850 } 1851 pmc->tomb = NULL; 1852 for (psf = pmc->sources; psf; psf = nextpsf) { 1853 nextpsf = psf->sf_next; 1854 kfree(psf); 1855 } 1856 pmc->sources = NULL; 1857 pmc->sfmode = MCAST_EXCLUDE; 1858 pmc->sfcount[MCAST_INCLUDE] = 0; 1859 pmc->sfcount[MCAST_EXCLUDE] = 1; 1860 } 1861 1862 1863 /* 1864 * Join a multicast group 1865 */ 1866 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1867 { 1868 int err; 1869 __be32 addr = imr->imr_multiaddr.s_addr; 1870 struct ip_mc_socklist *iml = NULL, *i; 1871 struct in_device *in_dev; 1872 struct inet_sock *inet = inet_sk(sk); 1873 struct net *net = sock_net(sk); 1874 int ifindex; 1875 int count = 0; 1876 1877 if (!ipv4_is_multicast(addr)) 1878 return -EINVAL; 1879 1880 rtnl_lock(); 1881 1882 in_dev = ip_mc_find_dev(net, imr); 1883 1884 if (!in_dev) { 1885 iml = NULL; 1886 err = -ENODEV; 1887 goto done; 1888 } 1889 1890 err = -EADDRINUSE; 1891 ifindex = imr->imr_ifindex; 1892 for_each_pmc_rtnl(inet, i) { 1893 if (i->multi.imr_multiaddr.s_addr == addr && 1894 i->multi.imr_ifindex == ifindex) 1895 goto done; 1896 count++; 1897 } 1898 err = -ENOBUFS; 1899 if (count >= sysctl_igmp_max_memberships) 1900 goto done; 1901 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1902 if (iml == NULL) 1903 goto done; 1904 1905 memcpy(&iml->multi, imr, sizeof(*imr)); 1906 iml->next_rcu = inet->mc_list; 1907 iml->sflist = NULL; 1908 iml->sfmode = MCAST_EXCLUDE; 1909 rcu_assign_pointer(inet->mc_list, iml); 1910 ip_mc_inc_group(in_dev, addr); 1911 err = 0; 1912 done: 1913 rtnl_unlock(); 1914 return err; 1915 } 1916 EXPORT_SYMBOL(ip_mc_join_group); 1917 1918 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1919 struct in_device *in_dev) 1920 { 1921 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1922 int err; 1923 1924 if (psf == NULL) { 1925 /* any-source empty exclude case */ 1926 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1927 iml->sfmode, 0, NULL, 0); 1928 } 1929 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1930 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1931 RCU_INIT_POINTER(iml->sflist, NULL); 1932 /* decrease mem now to avoid the memleak warning */ 1933 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1934 kfree_rcu(psf, rcu); 1935 return err; 1936 } 1937 1938 /* 1939 * Ask a socket to leave a group. 1940 */ 1941 1942 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1943 { 1944 struct inet_sock *inet = inet_sk(sk); 1945 struct ip_mc_socklist *iml; 1946 struct ip_mc_socklist __rcu **imlp; 1947 struct in_device *in_dev; 1948 struct net *net = sock_net(sk); 1949 __be32 group = imr->imr_multiaddr.s_addr; 1950 u32 ifindex; 1951 int ret = -EADDRNOTAVAIL; 1952 1953 rtnl_lock(); 1954 in_dev = ip_mc_find_dev(net, imr); 1955 ifindex = imr->imr_ifindex; 1956 for (imlp = &inet->mc_list; 1957 (iml = rtnl_dereference(*imlp)) != NULL; 1958 imlp = &iml->next_rcu) { 1959 if (iml->multi.imr_multiaddr.s_addr != group) 1960 continue; 1961 if (ifindex) { 1962 if (iml->multi.imr_ifindex != ifindex) 1963 continue; 1964 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1965 iml->multi.imr_address.s_addr) 1966 continue; 1967 1968 (void) ip_mc_leave_src(sk, iml, in_dev); 1969 1970 *imlp = iml->next_rcu; 1971 1972 if (in_dev) 1973 ip_mc_dec_group(in_dev, group); 1974 rtnl_unlock(); 1975 /* decrease mem now to avoid the memleak warning */ 1976 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1977 kfree_rcu(iml, rcu); 1978 return 0; 1979 } 1980 if (!in_dev) 1981 ret = -ENODEV; 1982 rtnl_unlock(); 1983 return ret; 1984 } 1985 EXPORT_SYMBOL(ip_mc_leave_group); 1986 1987 int ip_mc_source(int add, int omode, struct sock *sk, struct 1988 ip_mreq_source *mreqs, int ifindex) 1989 { 1990 int err; 1991 struct ip_mreqn imr; 1992 __be32 addr = mreqs->imr_multiaddr; 1993 struct ip_mc_socklist *pmc; 1994 struct in_device *in_dev = NULL; 1995 struct inet_sock *inet = inet_sk(sk); 1996 struct ip_sf_socklist *psl; 1997 struct net *net = sock_net(sk); 1998 int leavegroup = 0; 1999 int i, j, rv; 2000 2001 if (!ipv4_is_multicast(addr)) 2002 return -EINVAL; 2003 2004 rtnl_lock(); 2005 2006 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 2007 imr.imr_address.s_addr = mreqs->imr_interface; 2008 imr.imr_ifindex = ifindex; 2009 in_dev = ip_mc_find_dev(net, &imr); 2010 2011 if (!in_dev) { 2012 err = -ENODEV; 2013 goto done; 2014 } 2015 err = -EADDRNOTAVAIL; 2016 2017 for_each_pmc_rtnl(inet, pmc) { 2018 if ((pmc->multi.imr_multiaddr.s_addr == 2019 imr.imr_multiaddr.s_addr) && 2020 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 2021 break; 2022 } 2023 if (!pmc) { /* must have a prior join */ 2024 err = -EINVAL; 2025 goto done; 2026 } 2027 /* if a source filter was set, must be the same mode as before */ 2028 if (pmc->sflist) { 2029 if (pmc->sfmode != omode) { 2030 err = -EINVAL; 2031 goto done; 2032 } 2033 } else if (pmc->sfmode != omode) { 2034 /* allow mode switches for empty-set filters */ 2035 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 2036 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 2037 NULL, 0); 2038 pmc->sfmode = omode; 2039 } 2040 2041 psl = rtnl_dereference(pmc->sflist); 2042 if (!add) { 2043 if (!psl) 2044 goto done; /* err = -EADDRNOTAVAIL */ 2045 rv = !0; 2046 for (i = 0; i < psl->sl_count; i++) { 2047 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2048 sizeof(__be32)); 2049 if (rv == 0) 2050 break; 2051 } 2052 if (rv) /* source not found */ 2053 goto done; /* err = -EADDRNOTAVAIL */ 2054 2055 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2056 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 2057 leavegroup = 1; 2058 goto done; 2059 } 2060 2061 /* update the interface filter */ 2062 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2063 &mreqs->imr_sourceaddr, 1); 2064 2065 for (j = i+1; j < psl->sl_count; j++) 2066 psl->sl_addr[j-1] = psl->sl_addr[j]; 2067 psl->sl_count--; 2068 err = 0; 2069 goto done; 2070 } 2071 /* else, add a new source to the filter */ 2072 2073 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 2074 err = -ENOBUFS; 2075 goto done; 2076 } 2077 if (!psl || psl->sl_count == psl->sl_max) { 2078 struct ip_sf_socklist *newpsl; 2079 int count = IP_SFBLOCK; 2080 2081 if (psl) 2082 count += psl->sl_max; 2083 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2084 if (!newpsl) { 2085 err = -ENOBUFS; 2086 goto done; 2087 } 2088 newpsl->sl_max = count; 2089 newpsl->sl_count = count - IP_SFBLOCK; 2090 if (psl) { 2091 for (i = 0; i < psl->sl_count; i++) 2092 newpsl->sl_addr[i] = psl->sl_addr[i]; 2093 /* decrease mem now to avoid the memleak warning */ 2094 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2095 kfree_rcu(psl, rcu); 2096 } 2097 rcu_assign_pointer(pmc->sflist, newpsl); 2098 psl = newpsl; 2099 } 2100 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2101 for (i = 0; i < psl->sl_count; i++) { 2102 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2103 sizeof(__be32)); 2104 if (rv == 0) 2105 break; 2106 } 2107 if (rv == 0) /* address already there is an error */ 2108 goto done; 2109 for (j = psl->sl_count-1; j >= i; j--) 2110 psl->sl_addr[j+1] = psl->sl_addr[j]; 2111 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2112 psl->sl_count++; 2113 err = 0; 2114 /* update the interface list */ 2115 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2116 &mreqs->imr_sourceaddr, 1); 2117 done: 2118 rtnl_unlock(); 2119 if (leavegroup) 2120 return ip_mc_leave_group(sk, &imr); 2121 return err; 2122 } 2123 2124 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2125 { 2126 int err = 0; 2127 struct ip_mreqn imr; 2128 __be32 addr = msf->imsf_multiaddr; 2129 struct ip_mc_socklist *pmc; 2130 struct in_device *in_dev; 2131 struct inet_sock *inet = inet_sk(sk); 2132 struct ip_sf_socklist *newpsl, *psl; 2133 struct net *net = sock_net(sk); 2134 int leavegroup = 0; 2135 2136 if (!ipv4_is_multicast(addr)) 2137 return -EINVAL; 2138 if (msf->imsf_fmode != MCAST_INCLUDE && 2139 msf->imsf_fmode != MCAST_EXCLUDE) 2140 return -EINVAL; 2141 2142 rtnl_lock(); 2143 2144 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2145 imr.imr_address.s_addr = msf->imsf_interface; 2146 imr.imr_ifindex = ifindex; 2147 in_dev = ip_mc_find_dev(net, &imr); 2148 2149 if (!in_dev) { 2150 err = -ENODEV; 2151 goto done; 2152 } 2153 2154 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2155 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2156 leavegroup = 1; 2157 goto done; 2158 } 2159 2160 for_each_pmc_rtnl(inet, pmc) { 2161 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2162 pmc->multi.imr_ifindex == imr.imr_ifindex) 2163 break; 2164 } 2165 if (!pmc) { /* must have a prior join */ 2166 err = -EINVAL; 2167 goto done; 2168 } 2169 if (msf->imsf_numsrc) { 2170 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2171 GFP_KERNEL); 2172 if (!newpsl) { 2173 err = -ENOBUFS; 2174 goto done; 2175 } 2176 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2177 memcpy(newpsl->sl_addr, msf->imsf_slist, 2178 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2179 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2180 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2181 if (err) { 2182 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2183 goto done; 2184 } 2185 } else { 2186 newpsl = NULL; 2187 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2188 msf->imsf_fmode, 0, NULL, 0); 2189 } 2190 psl = rtnl_dereference(pmc->sflist); 2191 if (psl) { 2192 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2193 psl->sl_count, psl->sl_addr, 0); 2194 /* decrease mem now to avoid the memleak warning */ 2195 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2196 kfree_rcu(psl, rcu); 2197 } else 2198 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2199 0, NULL, 0); 2200 rcu_assign_pointer(pmc->sflist, newpsl); 2201 pmc->sfmode = msf->imsf_fmode; 2202 err = 0; 2203 done: 2204 rtnl_unlock(); 2205 if (leavegroup) 2206 err = ip_mc_leave_group(sk, &imr); 2207 return err; 2208 } 2209 2210 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2211 struct ip_msfilter __user *optval, int __user *optlen) 2212 { 2213 int err, len, count, copycount; 2214 struct ip_mreqn imr; 2215 __be32 addr = msf->imsf_multiaddr; 2216 struct ip_mc_socklist *pmc; 2217 struct in_device *in_dev; 2218 struct inet_sock *inet = inet_sk(sk); 2219 struct ip_sf_socklist *psl; 2220 struct net *net = sock_net(sk); 2221 2222 if (!ipv4_is_multicast(addr)) 2223 return -EINVAL; 2224 2225 rtnl_lock(); 2226 2227 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2228 imr.imr_address.s_addr = msf->imsf_interface; 2229 imr.imr_ifindex = 0; 2230 in_dev = ip_mc_find_dev(net, &imr); 2231 2232 if (!in_dev) { 2233 err = -ENODEV; 2234 goto done; 2235 } 2236 err = -EADDRNOTAVAIL; 2237 2238 for_each_pmc_rtnl(inet, pmc) { 2239 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2240 pmc->multi.imr_ifindex == imr.imr_ifindex) 2241 break; 2242 } 2243 if (!pmc) /* must have a prior join */ 2244 goto done; 2245 msf->imsf_fmode = pmc->sfmode; 2246 psl = rtnl_dereference(pmc->sflist); 2247 rtnl_unlock(); 2248 if (!psl) { 2249 len = 0; 2250 count = 0; 2251 } else { 2252 count = psl->sl_count; 2253 } 2254 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2255 len = copycount * sizeof(psl->sl_addr[0]); 2256 msf->imsf_numsrc = count; 2257 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2258 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2259 return -EFAULT; 2260 } 2261 if (len && 2262 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2263 return -EFAULT; 2264 return 0; 2265 done: 2266 rtnl_unlock(); 2267 return err; 2268 } 2269 2270 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2271 struct group_filter __user *optval, int __user *optlen) 2272 { 2273 int err, i, count, copycount; 2274 struct sockaddr_in *psin; 2275 __be32 addr; 2276 struct ip_mc_socklist *pmc; 2277 struct inet_sock *inet = inet_sk(sk); 2278 struct ip_sf_socklist *psl; 2279 2280 psin = (struct sockaddr_in *)&gsf->gf_group; 2281 if (psin->sin_family != AF_INET) 2282 return -EINVAL; 2283 addr = psin->sin_addr.s_addr; 2284 if (!ipv4_is_multicast(addr)) 2285 return -EINVAL; 2286 2287 rtnl_lock(); 2288 2289 err = -EADDRNOTAVAIL; 2290 2291 for_each_pmc_rtnl(inet, pmc) { 2292 if (pmc->multi.imr_multiaddr.s_addr == addr && 2293 pmc->multi.imr_ifindex == gsf->gf_interface) 2294 break; 2295 } 2296 if (!pmc) /* must have a prior join */ 2297 goto done; 2298 gsf->gf_fmode = pmc->sfmode; 2299 psl = rtnl_dereference(pmc->sflist); 2300 rtnl_unlock(); 2301 count = psl ? psl->sl_count : 0; 2302 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2303 gsf->gf_numsrc = count; 2304 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2305 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2306 return -EFAULT; 2307 } 2308 for (i = 0; i < copycount; i++) { 2309 struct sockaddr_storage ss; 2310 2311 psin = (struct sockaddr_in *)&ss; 2312 memset(&ss, 0, sizeof(ss)); 2313 psin->sin_family = AF_INET; 2314 psin->sin_addr.s_addr = psl->sl_addr[i]; 2315 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2316 return -EFAULT; 2317 } 2318 return 0; 2319 done: 2320 rtnl_unlock(); 2321 return err; 2322 } 2323 2324 /* 2325 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2326 */ 2327 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2328 { 2329 struct inet_sock *inet = inet_sk(sk); 2330 struct ip_mc_socklist *pmc; 2331 struct ip_sf_socklist *psl; 2332 int i; 2333 int ret; 2334 2335 ret = 1; 2336 if (!ipv4_is_multicast(loc_addr)) 2337 goto out; 2338 2339 rcu_read_lock(); 2340 for_each_pmc_rcu(inet, pmc) { 2341 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2342 pmc->multi.imr_ifindex == dif) 2343 break; 2344 } 2345 ret = inet->mc_all; 2346 if (!pmc) 2347 goto unlock; 2348 psl = rcu_dereference(pmc->sflist); 2349 ret = (pmc->sfmode == MCAST_EXCLUDE); 2350 if (!psl) 2351 goto unlock; 2352 2353 for (i = 0; i < psl->sl_count; i++) { 2354 if (psl->sl_addr[i] == rmt_addr) 2355 break; 2356 } 2357 ret = 0; 2358 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2359 goto unlock; 2360 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2361 goto unlock; 2362 ret = 1; 2363 unlock: 2364 rcu_read_unlock(); 2365 out: 2366 return ret; 2367 } 2368 2369 /* 2370 * A socket is closing. 2371 */ 2372 2373 void ip_mc_drop_socket(struct sock *sk) 2374 { 2375 struct inet_sock *inet = inet_sk(sk); 2376 struct ip_mc_socklist *iml; 2377 struct net *net = sock_net(sk); 2378 2379 if (inet->mc_list == NULL) 2380 return; 2381 2382 rtnl_lock(); 2383 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2384 struct in_device *in_dev; 2385 2386 inet->mc_list = iml->next_rcu; 2387 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2388 (void) ip_mc_leave_src(sk, iml, in_dev); 2389 if (in_dev != NULL) 2390 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2391 /* decrease mem now to avoid the memleak warning */ 2392 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2393 kfree_rcu(iml, rcu); 2394 } 2395 rtnl_unlock(); 2396 } 2397 2398 /* called with rcu_read_lock() */ 2399 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2400 { 2401 struct ip_mc_list *im; 2402 struct ip_mc_list __rcu **mc_hash; 2403 struct ip_sf_list *psf; 2404 int rv = 0; 2405 2406 mc_hash = rcu_dereference(in_dev->mc_hash); 2407 if (mc_hash) { 2408 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); 2409 2410 for (im = rcu_dereference(mc_hash[hash]); 2411 im != NULL; 2412 im = rcu_dereference(im->next_hash)) { 2413 if (im->multiaddr == mc_addr) 2414 break; 2415 } 2416 } else { 2417 for_each_pmc_rcu(in_dev, im) { 2418 if (im->multiaddr == mc_addr) 2419 break; 2420 } 2421 } 2422 if (im && proto == IPPROTO_IGMP) { 2423 rv = 1; 2424 } else if (im) { 2425 if (src_addr) { 2426 for (psf = im->sources; psf; psf = psf->sf_next) { 2427 if (psf->sf_inaddr == src_addr) 2428 break; 2429 } 2430 if (psf) 2431 rv = psf->sf_count[MCAST_INCLUDE] || 2432 psf->sf_count[MCAST_EXCLUDE] != 2433 im->sfcount[MCAST_EXCLUDE]; 2434 else 2435 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2436 } else 2437 rv = 1; /* unspecified source; tentatively allow */ 2438 } 2439 return rv; 2440 } 2441 2442 #if defined(CONFIG_PROC_FS) 2443 struct igmp_mc_iter_state { 2444 struct seq_net_private p; 2445 struct net_device *dev; 2446 struct in_device *in_dev; 2447 }; 2448 2449 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2450 2451 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2452 { 2453 struct net *net = seq_file_net(seq); 2454 struct ip_mc_list *im = NULL; 2455 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2456 2457 state->in_dev = NULL; 2458 for_each_netdev_rcu(net, state->dev) { 2459 struct in_device *in_dev; 2460 2461 in_dev = __in_dev_get_rcu(state->dev); 2462 if (!in_dev) 2463 continue; 2464 im = rcu_dereference(in_dev->mc_list); 2465 if (im) { 2466 state->in_dev = in_dev; 2467 break; 2468 } 2469 } 2470 return im; 2471 } 2472 2473 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2474 { 2475 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2476 2477 im = rcu_dereference(im->next_rcu); 2478 while (!im) { 2479 state->dev = next_net_device_rcu(state->dev); 2480 if (!state->dev) { 2481 state->in_dev = NULL; 2482 break; 2483 } 2484 state->in_dev = __in_dev_get_rcu(state->dev); 2485 if (!state->in_dev) 2486 continue; 2487 im = rcu_dereference(state->in_dev->mc_list); 2488 } 2489 return im; 2490 } 2491 2492 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2493 { 2494 struct ip_mc_list *im = igmp_mc_get_first(seq); 2495 if (im) 2496 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2497 --pos; 2498 return pos ? NULL : im; 2499 } 2500 2501 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2502 __acquires(rcu) 2503 { 2504 rcu_read_lock(); 2505 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2506 } 2507 2508 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2509 { 2510 struct ip_mc_list *im; 2511 if (v == SEQ_START_TOKEN) 2512 im = igmp_mc_get_first(seq); 2513 else 2514 im = igmp_mc_get_next(seq, v); 2515 ++*pos; 2516 return im; 2517 } 2518 2519 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2520 __releases(rcu) 2521 { 2522 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2523 2524 state->in_dev = NULL; 2525 state->dev = NULL; 2526 rcu_read_unlock(); 2527 } 2528 2529 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2530 { 2531 if (v == SEQ_START_TOKEN) 2532 seq_puts(seq, 2533 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2534 else { 2535 struct ip_mc_list *im = (struct ip_mc_list *)v; 2536 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2537 char *querier; 2538 long delta; 2539 2540 #ifdef CONFIG_IP_MULTICAST 2541 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2542 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2543 "V3"; 2544 #else 2545 querier = "NONE"; 2546 #endif 2547 2548 if (rcu_dereference(state->in_dev->mc_list) == im) { 2549 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2550 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2551 } 2552 2553 delta = im->timer.expires - jiffies; 2554 seq_printf(seq, 2555 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2556 im->multiaddr, im->users, 2557 im->tm_running, 2558 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, 2559 im->reporter); 2560 } 2561 return 0; 2562 } 2563 2564 static const struct seq_operations igmp_mc_seq_ops = { 2565 .start = igmp_mc_seq_start, 2566 .next = igmp_mc_seq_next, 2567 .stop = igmp_mc_seq_stop, 2568 .show = igmp_mc_seq_show, 2569 }; 2570 2571 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2572 { 2573 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2574 sizeof(struct igmp_mc_iter_state)); 2575 } 2576 2577 static const struct file_operations igmp_mc_seq_fops = { 2578 .owner = THIS_MODULE, 2579 .open = igmp_mc_seq_open, 2580 .read = seq_read, 2581 .llseek = seq_lseek, 2582 .release = seq_release_net, 2583 }; 2584 2585 struct igmp_mcf_iter_state { 2586 struct seq_net_private p; 2587 struct net_device *dev; 2588 struct in_device *idev; 2589 struct ip_mc_list *im; 2590 }; 2591 2592 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2593 2594 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2595 { 2596 struct net *net = seq_file_net(seq); 2597 struct ip_sf_list *psf = NULL; 2598 struct ip_mc_list *im = NULL; 2599 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2600 2601 state->idev = NULL; 2602 state->im = NULL; 2603 for_each_netdev_rcu(net, state->dev) { 2604 struct in_device *idev; 2605 idev = __in_dev_get_rcu(state->dev); 2606 if (unlikely(idev == NULL)) 2607 continue; 2608 im = rcu_dereference(idev->mc_list); 2609 if (likely(im != NULL)) { 2610 spin_lock_bh(&im->lock); 2611 psf = im->sources; 2612 if (likely(psf != NULL)) { 2613 state->im = im; 2614 state->idev = idev; 2615 break; 2616 } 2617 spin_unlock_bh(&im->lock); 2618 } 2619 } 2620 return psf; 2621 } 2622 2623 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2624 { 2625 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2626 2627 psf = psf->sf_next; 2628 while (!psf) { 2629 spin_unlock_bh(&state->im->lock); 2630 state->im = state->im->next; 2631 while (!state->im) { 2632 state->dev = next_net_device_rcu(state->dev); 2633 if (!state->dev) { 2634 state->idev = NULL; 2635 goto out; 2636 } 2637 state->idev = __in_dev_get_rcu(state->dev); 2638 if (!state->idev) 2639 continue; 2640 state->im = rcu_dereference(state->idev->mc_list); 2641 } 2642 if (!state->im) 2643 break; 2644 spin_lock_bh(&state->im->lock); 2645 psf = state->im->sources; 2646 } 2647 out: 2648 return psf; 2649 } 2650 2651 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2652 { 2653 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2654 if (psf) 2655 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2656 --pos; 2657 return pos ? NULL : psf; 2658 } 2659 2660 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2661 __acquires(rcu) 2662 { 2663 rcu_read_lock(); 2664 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2665 } 2666 2667 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2668 { 2669 struct ip_sf_list *psf; 2670 if (v == SEQ_START_TOKEN) 2671 psf = igmp_mcf_get_first(seq); 2672 else 2673 psf = igmp_mcf_get_next(seq, v); 2674 ++*pos; 2675 return psf; 2676 } 2677 2678 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2679 __releases(rcu) 2680 { 2681 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2682 if (likely(state->im != NULL)) { 2683 spin_unlock_bh(&state->im->lock); 2684 state->im = NULL; 2685 } 2686 state->idev = NULL; 2687 state->dev = NULL; 2688 rcu_read_unlock(); 2689 } 2690 2691 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2692 { 2693 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2694 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2695 2696 if (v == SEQ_START_TOKEN) { 2697 seq_printf(seq, 2698 "%3s %6s " 2699 "%10s %10s %6s %6s\n", "Idx", 2700 "Device", "MCA", 2701 "SRC", "INC", "EXC"); 2702 } else { 2703 seq_printf(seq, 2704 "%3d %6.6s 0x%08x " 2705 "0x%08x %6lu %6lu\n", 2706 state->dev->ifindex, state->dev->name, 2707 ntohl(state->im->multiaddr), 2708 ntohl(psf->sf_inaddr), 2709 psf->sf_count[MCAST_INCLUDE], 2710 psf->sf_count[MCAST_EXCLUDE]); 2711 } 2712 return 0; 2713 } 2714 2715 static const struct seq_operations igmp_mcf_seq_ops = { 2716 .start = igmp_mcf_seq_start, 2717 .next = igmp_mcf_seq_next, 2718 .stop = igmp_mcf_seq_stop, 2719 .show = igmp_mcf_seq_show, 2720 }; 2721 2722 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2723 { 2724 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2725 sizeof(struct igmp_mcf_iter_state)); 2726 } 2727 2728 static const struct file_operations igmp_mcf_seq_fops = { 2729 .owner = THIS_MODULE, 2730 .open = igmp_mcf_seq_open, 2731 .read = seq_read, 2732 .llseek = seq_lseek, 2733 .release = seq_release_net, 2734 }; 2735 2736 static int __net_init igmp_net_init(struct net *net) 2737 { 2738 struct proc_dir_entry *pde; 2739 2740 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); 2741 if (!pde) 2742 goto out_igmp; 2743 pde = proc_create("mcfilter", S_IRUGO, net->proc_net, 2744 &igmp_mcf_seq_fops); 2745 if (!pde) 2746 goto out_mcfilter; 2747 return 0; 2748 2749 out_mcfilter: 2750 remove_proc_entry("igmp", net->proc_net); 2751 out_igmp: 2752 return -ENOMEM; 2753 } 2754 2755 static void __net_exit igmp_net_exit(struct net *net) 2756 { 2757 remove_proc_entry("mcfilter", net->proc_net); 2758 remove_proc_entry("igmp", net->proc_net); 2759 } 2760 2761 static struct pernet_operations igmp_net_ops = { 2762 .init = igmp_net_init, 2763 .exit = igmp_net_exit, 2764 }; 2765 #endif 2766 2767 static int igmp_netdev_event(struct notifier_block *this, 2768 unsigned long event, void *ptr) 2769 { 2770 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2771 struct in_device *in_dev; 2772 2773 switch (event) { 2774 case NETDEV_RESEND_IGMP: 2775 in_dev = __in_dev_get_rtnl(dev); 2776 if (in_dev) 2777 ip_mc_rejoin_groups(in_dev); 2778 break; 2779 default: 2780 break; 2781 } 2782 return NOTIFY_DONE; 2783 } 2784 2785 static struct notifier_block igmp_notifier = { 2786 .notifier_call = igmp_netdev_event, 2787 }; 2788 2789 int __init igmp_mc_init(void) 2790 { 2791 #if defined(CONFIG_PROC_FS) 2792 int err; 2793 2794 err = register_pernet_subsys(&igmp_net_ops); 2795 if (err) 2796 return err; 2797 err = register_netdevice_notifier(&igmp_notifier); 2798 if (err) 2799 goto reg_notif_fail; 2800 return 0; 2801 2802 reg_notif_fail: 2803 unregister_pernet_subsys(&igmp_net_ops); 2804 return err; 2805 #else 2806 return register_netdevice_notifier(&igmp_notifier); 2807 #endif 2808 } 2809