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, 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, 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 if (skb_checksum_simple_validate(skb)) 992 goto drop; 993 994 ih = igmp_hdr(skb); 995 switch (ih->type) { 996 case IGMP_HOST_MEMBERSHIP_QUERY: 997 dropped = igmp_heard_query(in_dev, skb, len); 998 break; 999 case IGMP_HOST_MEMBERSHIP_REPORT: 1000 case IGMPV2_HOST_MEMBERSHIP_REPORT: 1001 /* Is it our report looped back? */ 1002 if (rt_is_output_route(skb_rtable(skb))) 1003 break; 1004 /* don't rely on MC router hearing unicast reports */ 1005 if (skb->pkt_type == PACKET_MULTICAST || 1006 skb->pkt_type == PACKET_BROADCAST) 1007 dropped = igmp_heard_report(in_dev, ih->group); 1008 break; 1009 case IGMP_PIM: 1010 #ifdef CONFIG_IP_PIMSM_V1 1011 return pim_rcv_v1(skb); 1012 #endif 1013 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1014 case IGMP_DVMRP: 1015 case IGMP_TRACE: 1016 case IGMP_HOST_LEAVE_MESSAGE: 1017 case IGMP_MTRACE: 1018 case IGMP_MTRACE_RESP: 1019 break; 1020 default: 1021 break; 1022 } 1023 1024 drop: 1025 if (dropped) 1026 kfree_skb(skb); 1027 else 1028 consume_skb(skb); 1029 return 0; 1030 } 1031 1032 #endif 1033 1034 1035 /* 1036 * Add a filter to a device 1037 */ 1038 1039 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1040 { 1041 char buf[MAX_ADDR_LEN]; 1042 struct net_device *dev = in_dev->dev; 1043 1044 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1045 We will get multicast token leakage, when IFF_MULTICAST 1046 is changed. This check should be done in ndo_set_rx_mode 1047 routine. Something sort of: 1048 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1049 --ANK 1050 */ 1051 if (arp_mc_map(addr, buf, dev, 0) == 0) 1052 dev_mc_add(dev, buf); 1053 } 1054 1055 /* 1056 * Remove a filter from a device 1057 */ 1058 1059 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1060 { 1061 char buf[MAX_ADDR_LEN]; 1062 struct net_device *dev = in_dev->dev; 1063 1064 if (arp_mc_map(addr, buf, dev, 0) == 0) 1065 dev_mc_del(dev, buf); 1066 } 1067 1068 #ifdef CONFIG_IP_MULTICAST 1069 /* 1070 * deleted ip_mc_list manipulation 1071 */ 1072 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1073 { 1074 struct ip_mc_list *pmc; 1075 1076 /* this is an "ip_mc_list" for convenience; only the fields below 1077 * are actually used. In particular, the refcnt and users are not 1078 * used for management of the delete list. Using the same structure 1079 * for deleted items allows change reports to use common code with 1080 * non-deleted or query-response MCA's. 1081 */ 1082 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1083 if (!pmc) 1084 return; 1085 spin_lock_bh(&im->lock); 1086 pmc->interface = im->interface; 1087 in_dev_hold(in_dev); 1088 pmc->multiaddr = im->multiaddr; 1089 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1090 IGMP_Unsolicited_Report_Count; 1091 pmc->sfmode = im->sfmode; 1092 if (pmc->sfmode == MCAST_INCLUDE) { 1093 struct ip_sf_list *psf; 1094 1095 pmc->tomb = im->tomb; 1096 pmc->sources = im->sources; 1097 im->tomb = im->sources = NULL; 1098 for (psf = pmc->sources; psf; psf = psf->sf_next) 1099 psf->sf_crcount = pmc->crcount; 1100 } 1101 spin_unlock_bh(&im->lock); 1102 1103 spin_lock_bh(&in_dev->mc_tomb_lock); 1104 pmc->next = in_dev->mc_tomb; 1105 in_dev->mc_tomb = pmc; 1106 spin_unlock_bh(&in_dev->mc_tomb_lock); 1107 } 1108 1109 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1110 { 1111 struct ip_mc_list *pmc, *pmc_prev; 1112 struct ip_sf_list *psf, *psf_next; 1113 1114 spin_lock_bh(&in_dev->mc_tomb_lock); 1115 pmc_prev = NULL; 1116 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { 1117 if (pmc->multiaddr == multiaddr) 1118 break; 1119 pmc_prev = pmc; 1120 } 1121 if (pmc) { 1122 if (pmc_prev) 1123 pmc_prev->next = pmc->next; 1124 else 1125 in_dev->mc_tomb = pmc->next; 1126 } 1127 spin_unlock_bh(&in_dev->mc_tomb_lock); 1128 if (pmc) { 1129 for (psf = pmc->tomb; psf; psf = psf_next) { 1130 psf_next = psf->sf_next; 1131 kfree(psf); 1132 } 1133 in_dev_put(pmc->interface); 1134 kfree(pmc); 1135 } 1136 } 1137 1138 static void igmpv3_clear_delrec(struct in_device *in_dev) 1139 { 1140 struct ip_mc_list *pmc, *nextpmc; 1141 1142 spin_lock_bh(&in_dev->mc_tomb_lock); 1143 pmc = in_dev->mc_tomb; 1144 in_dev->mc_tomb = NULL; 1145 spin_unlock_bh(&in_dev->mc_tomb_lock); 1146 1147 for (; pmc; pmc = nextpmc) { 1148 nextpmc = pmc->next; 1149 ip_mc_clear_src(pmc); 1150 in_dev_put(pmc->interface); 1151 kfree(pmc); 1152 } 1153 /* clear dead sources, too */ 1154 rcu_read_lock(); 1155 for_each_pmc_rcu(in_dev, pmc) { 1156 struct ip_sf_list *psf, *psf_next; 1157 1158 spin_lock_bh(&pmc->lock); 1159 psf = pmc->tomb; 1160 pmc->tomb = NULL; 1161 spin_unlock_bh(&pmc->lock); 1162 for (; psf; psf = psf_next) { 1163 psf_next = psf->sf_next; 1164 kfree(psf); 1165 } 1166 } 1167 rcu_read_unlock(); 1168 } 1169 #endif 1170 1171 static void igmp_group_dropped(struct ip_mc_list *im) 1172 { 1173 struct in_device *in_dev = im->interface; 1174 #ifdef CONFIG_IP_MULTICAST 1175 int reporter; 1176 #endif 1177 1178 if (im->loaded) { 1179 im->loaded = 0; 1180 ip_mc_filter_del(in_dev, im->multiaddr); 1181 } 1182 1183 #ifdef CONFIG_IP_MULTICAST 1184 if (im->multiaddr == IGMP_ALL_HOSTS) 1185 return; 1186 1187 reporter = im->reporter; 1188 igmp_stop_timer(im); 1189 1190 if (!in_dev->dead) { 1191 if (IGMP_V1_SEEN(in_dev)) 1192 return; 1193 if (IGMP_V2_SEEN(in_dev)) { 1194 if (reporter) 1195 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1196 return; 1197 } 1198 /* IGMPv3 */ 1199 igmpv3_add_delrec(in_dev, im); 1200 1201 igmp_ifc_event(in_dev); 1202 } 1203 #endif 1204 } 1205 1206 static void igmp_group_added(struct ip_mc_list *im) 1207 { 1208 struct in_device *in_dev = im->interface; 1209 1210 if (im->loaded == 0) { 1211 im->loaded = 1; 1212 ip_mc_filter_add(in_dev, im->multiaddr); 1213 } 1214 1215 #ifdef CONFIG_IP_MULTICAST 1216 if (im->multiaddr == IGMP_ALL_HOSTS) 1217 return; 1218 1219 if (in_dev->dead) 1220 return; 1221 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1222 spin_lock_bh(&im->lock); 1223 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1224 spin_unlock_bh(&im->lock); 1225 return; 1226 } 1227 /* else, v3 */ 1228 1229 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1230 IGMP_Unsolicited_Report_Count; 1231 igmp_ifc_event(in_dev); 1232 #endif 1233 } 1234 1235 1236 /* 1237 * Multicast list managers 1238 */ 1239 1240 static u32 ip_mc_hash(const struct ip_mc_list *im) 1241 { 1242 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); 1243 } 1244 1245 static void ip_mc_hash_add(struct in_device *in_dev, 1246 struct ip_mc_list *im) 1247 { 1248 struct ip_mc_list __rcu **mc_hash; 1249 u32 hash; 1250 1251 mc_hash = rtnl_dereference(in_dev->mc_hash); 1252 if (mc_hash) { 1253 hash = ip_mc_hash(im); 1254 im->next_hash = mc_hash[hash]; 1255 rcu_assign_pointer(mc_hash[hash], im); 1256 return; 1257 } 1258 1259 /* do not use a hash table for small number of items */ 1260 if (in_dev->mc_count < 4) 1261 return; 1262 1263 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, 1264 GFP_KERNEL); 1265 if (!mc_hash) 1266 return; 1267 1268 for_each_pmc_rtnl(in_dev, im) { 1269 hash = ip_mc_hash(im); 1270 im->next_hash = mc_hash[hash]; 1271 RCU_INIT_POINTER(mc_hash[hash], im); 1272 } 1273 1274 rcu_assign_pointer(in_dev->mc_hash, mc_hash); 1275 } 1276 1277 static void ip_mc_hash_remove(struct in_device *in_dev, 1278 struct ip_mc_list *im) 1279 { 1280 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); 1281 struct ip_mc_list *aux; 1282 1283 if (!mc_hash) 1284 return; 1285 mc_hash += ip_mc_hash(im); 1286 while ((aux = rtnl_dereference(*mc_hash)) != im) 1287 mc_hash = &aux->next_hash; 1288 *mc_hash = im->next_hash; 1289 } 1290 1291 1292 /* 1293 * A socket has joined a multicast group on device dev. 1294 */ 1295 1296 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1297 { 1298 struct ip_mc_list *im; 1299 1300 ASSERT_RTNL(); 1301 1302 for_each_pmc_rtnl(in_dev, im) { 1303 if (im->multiaddr == addr) { 1304 im->users++; 1305 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1306 goto out; 1307 } 1308 } 1309 1310 im = kzalloc(sizeof(*im), GFP_KERNEL); 1311 if (!im) 1312 goto out; 1313 1314 im->users = 1; 1315 im->interface = in_dev; 1316 in_dev_hold(in_dev); 1317 im->multiaddr = addr; 1318 /* initial mode is (EX, empty) */ 1319 im->sfmode = MCAST_EXCLUDE; 1320 im->sfcount[MCAST_EXCLUDE] = 1; 1321 atomic_set(&im->refcnt, 1); 1322 spin_lock_init(&im->lock); 1323 #ifdef CONFIG_IP_MULTICAST 1324 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1325 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1326 #endif 1327 1328 im->next_rcu = in_dev->mc_list; 1329 in_dev->mc_count++; 1330 rcu_assign_pointer(in_dev->mc_list, im); 1331 1332 ip_mc_hash_add(in_dev, im); 1333 1334 #ifdef CONFIG_IP_MULTICAST 1335 igmpv3_del_delrec(in_dev, im->multiaddr); 1336 #endif 1337 igmp_group_added(im); 1338 if (!in_dev->dead) 1339 ip_rt_multicast_event(in_dev); 1340 out: 1341 return; 1342 } 1343 EXPORT_SYMBOL(ip_mc_inc_group); 1344 1345 /* 1346 * Resend IGMP JOIN report; used by netdev notifier. 1347 */ 1348 static void ip_mc_rejoin_groups(struct in_device *in_dev) 1349 { 1350 #ifdef CONFIG_IP_MULTICAST 1351 struct ip_mc_list *im; 1352 int type; 1353 1354 ASSERT_RTNL(); 1355 1356 for_each_pmc_rtnl(in_dev, im) { 1357 if (im->multiaddr == IGMP_ALL_HOSTS) 1358 continue; 1359 1360 /* a failover is happening and switches 1361 * must be notified immediately 1362 */ 1363 if (IGMP_V1_SEEN(in_dev)) 1364 type = IGMP_HOST_MEMBERSHIP_REPORT; 1365 else if (IGMP_V2_SEEN(in_dev)) 1366 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1367 else 1368 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1369 igmp_send_report(in_dev, im, type); 1370 } 1371 #endif 1372 } 1373 1374 /* 1375 * A socket has left a multicast group on device dev 1376 */ 1377 1378 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1379 { 1380 struct ip_mc_list *i; 1381 struct ip_mc_list __rcu **ip; 1382 1383 ASSERT_RTNL(); 1384 1385 for (ip = &in_dev->mc_list; 1386 (i = rtnl_dereference(*ip)) != NULL; 1387 ip = &i->next_rcu) { 1388 if (i->multiaddr == addr) { 1389 if (--i->users == 0) { 1390 ip_mc_hash_remove(in_dev, i); 1391 *ip = i->next_rcu; 1392 in_dev->mc_count--; 1393 igmp_group_dropped(i); 1394 ip_mc_clear_src(i); 1395 1396 if (!in_dev->dead) 1397 ip_rt_multicast_event(in_dev); 1398 1399 ip_ma_put(i); 1400 return; 1401 } 1402 break; 1403 } 1404 } 1405 } 1406 EXPORT_SYMBOL(ip_mc_dec_group); 1407 1408 /* Device changing type */ 1409 1410 void ip_mc_unmap(struct in_device *in_dev) 1411 { 1412 struct ip_mc_list *pmc; 1413 1414 ASSERT_RTNL(); 1415 1416 for_each_pmc_rtnl(in_dev, pmc) 1417 igmp_group_dropped(pmc); 1418 } 1419 1420 void ip_mc_remap(struct in_device *in_dev) 1421 { 1422 struct ip_mc_list *pmc; 1423 1424 ASSERT_RTNL(); 1425 1426 for_each_pmc_rtnl(in_dev, pmc) 1427 igmp_group_added(pmc); 1428 } 1429 1430 /* Device going down */ 1431 1432 void ip_mc_down(struct in_device *in_dev) 1433 { 1434 struct ip_mc_list *pmc; 1435 1436 ASSERT_RTNL(); 1437 1438 for_each_pmc_rtnl(in_dev, pmc) 1439 igmp_group_dropped(pmc); 1440 1441 #ifdef CONFIG_IP_MULTICAST 1442 in_dev->mr_ifc_count = 0; 1443 if (del_timer(&in_dev->mr_ifc_timer)) 1444 __in_dev_put(in_dev); 1445 in_dev->mr_gq_running = 0; 1446 if (del_timer(&in_dev->mr_gq_timer)) 1447 __in_dev_put(in_dev); 1448 igmpv3_clear_delrec(in_dev); 1449 #endif 1450 1451 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1452 } 1453 1454 void ip_mc_init_dev(struct in_device *in_dev) 1455 { 1456 ASSERT_RTNL(); 1457 1458 #ifdef CONFIG_IP_MULTICAST 1459 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1460 (unsigned long)in_dev); 1461 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1462 (unsigned long)in_dev); 1463 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1464 #endif 1465 1466 spin_lock_init(&in_dev->mc_tomb_lock); 1467 } 1468 1469 /* Device going up */ 1470 1471 void ip_mc_up(struct in_device *in_dev) 1472 { 1473 struct ip_mc_list *pmc; 1474 1475 ASSERT_RTNL(); 1476 1477 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1478 1479 for_each_pmc_rtnl(in_dev, pmc) 1480 igmp_group_added(pmc); 1481 } 1482 1483 /* 1484 * Device is about to be destroyed: clean up. 1485 */ 1486 1487 void ip_mc_destroy_dev(struct in_device *in_dev) 1488 { 1489 struct ip_mc_list *i; 1490 1491 ASSERT_RTNL(); 1492 1493 /* Deactivate timers */ 1494 ip_mc_down(in_dev); 1495 1496 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1497 in_dev->mc_list = i->next_rcu; 1498 in_dev->mc_count--; 1499 1500 /* We've dropped the groups in ip_mc_down already */ 1501 ip_mc_clear_src(i); 1502 ip_ma_put(i); 1503 } 1504 } 1505 1506 /* RTNL is locked */ 1507 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1508 { 1509 struct net_device *dev = NULL; 1510 struct in_device *idev = NULL; 1511 1512 if (imr->imr_ifindex) { 1513 idev = inetdev_by_index(net, imr->imr_ifindex); 1514 return idev; 1515 } 1516 if (imr->imr_address.s_addr) { 1517 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1518 if (!dev) 1519 return NULL; 1520 } 1521 1522 if (!dev) { 1523 struct rtable *rt = ip_route_output(net, 1524 imr->imr_multiaddr.s_addr, 1525 0, 0, 0); 1526 if (!IS_ERR(rt)) { 1527 dev = rt->dst.dev; 1528 ip_rt_put(rt); 1529 } 1530 } 1531 if (dev) { 1532 imr->imr_ifindex = dev->ifindex; 1533 idev = __in_dev_get_rtnl(dev); 1534 } 1535 return idev; 1536 } 1537 1538 /* 1539 * Join a socket to a group 1540 */ 1541 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1542 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1543 1544 1545 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1546 __be32 *psfsrc) 1547 { 1548 struct ip_sf_list *psf, *psf_prev; 1549 int rv = 0; 1550 1551 psf_prev = NULL; 1552 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1553 if (psf->sf_inaddr == *psfsrc) 1554 break; 1555 psf_prev = psf; 1556 } 1557 if (!psf || psf->sf_count[sfmode] == 0) { 1558 /* source filter not found, or count wrong => bug */ 1559 return -ESRCH; 1560 } 1561 psf->sf_count[sfmode]--; 1562 if (psf->sf_count[sfmode] == 0) { 1563 ip_rt_multicast_event(pmc->interface); 1564 } 1565 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1566 #ifdef CONFIG_IP_MULTICAST 1567 struct in_device *in_dev = pmc->interface; 1568 #endif 1569 1570 /* no more filters for this source */ 1571 if (psf_prev) 1572 psf_prev->sf_next = psf->sf_next; 1573 else 1574 pmc->sources = psf->sf_next; 1575 #ifdef CONFIG_IP_MULTICAST 1576 if (psf->sf_oldin && 1577 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1578 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1579 IGMP_Unsolicited_Report_Count; 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 ? in_dev->mr_qrv : 1643 IGMP_Unsolicited_Report_Count; 1644 in_dev->mr_ifc_count = pmc->crcount; 1645 for (psf = pmc->sources; psf; psf = psf->sf_next) 1646 psf->sf_crcount = 0; 1647 igmp_ifc_event(pmc->interface); 1648 } else if (sf_setstate(pmc) || changerec) { 1649 igmp_ifc_event(pmc->interface); 1650 #endif 1651 } 1652 out_unlock: 1653 spin_unlock_bh(&pmc->lock); 1654 return err; 1655 } 1656 1657 /* 1658 * Add multicast single-source filter to the interface list 1659 */ 1660 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1661 __be32 *psfsrc) 1662 { 1663 struct ip_sf_list *psf, *psf_prev; 1664 1665 psf_prev = NULL; 1666 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1667 if (psf->sf_inaddr == *psfsrc) 1668 break; 1669 psf_prev = psf; 1670 } 1671 if (!psf) { 1672 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1673 if (!psf) 1674 return -ENOBUFS; 1675 psf->sf_inaddr = *psfsrc; 1676 if (psf_prev) { 1677 psf_prev->sf_next = psf; 1678 } else 1679 pmc->sources = psf; 1680 } 1681 psf->sf_count[sfmode]++; 1682 if (psf->sf_count[sfmode] == 1) { 1683 ip_rt_multicast_event(pmc->interface); 1684 } 1685 return 0; 1686 } 1687 1688 #ifdef CONFIG_IP_MULTICAST 1689 static void sf_markstate(struct ip_mc_list *pmc) 1690 { 1691 struct ip_sf_list *psf; 1692 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1693 1694 for (psf = pmc->sources; psf; psf = psf->sf_next) 1695 if (pmc->sfcount[MCAST_EXCLUDE]) { 1696 psf->sf_oldin = mca_xcount == 1697 psf->sf_count[MCAST_EXCLUDE] && 1698 !psf->sf_count[MCAST_INCLUDE]; 1699 } else 1700 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1701 } 1702 1703 static int sf_setstate(struct ip_mc_list *pmc) 1704 { 1705 struct ip_sf_list *psf, *dpsf; 1706 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1707 int qrv = pmc->interface->mr_qrv; 1708 int new_in, rv; 1709 1710 rv = 0; 1711 for (psf = pmc->sources; psf; psf = psf->sf_next) { 1712 if (pmc->sfcount[MCAST_EXCLUDE]) { 1713 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1714 !psf->sf_count[MCAST_INCLUDE]; 1715 } else 1716 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1717 if (new_in) { 1718 if (!psf->sf_oldin) { 1719 struct ip_sf_list *prev = NULL; 1720 1721 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { 1722 if (dpsf->sf_inaddr == psf->sf_inaddr) 1723 break; 1724 prev = dpsf; 1725 } 1726 if (dpsf) { 1727 if (prev) 1728 prev->sf_next = dpsf->sf_next; 1729 else 1730 pmc->tomb = dpsf->sf_next; 1731 kfree(dpsf); 1732 } 1733 psf->sf_crcount = qrv; 1734 rv++; 1735 } 1736 } else if (psf->sf_oldin) { 1737 1738 psf->sf_crcount = 0; 1739 /* 1740 * add or update "delete" records if an active filter 1741 * is now inactive 1742 */ 1743 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) 1744 if (dpsf->sf_inaddr == psf->sf_inaddr) 1745 break; 1746 if (!dpsf) { 1747 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1748 if (!dpsf) 1749 continue; 1750 *dpsf = *psf; 1751 /* pmc->lock held by callers */ 1752 dpsf->sf_next = pmc->tomb; 1753 pmc->tomb = dpsf; 1754 } 1755 dpsf->sf_crcount = qrv; 1756 rv++; 1757 } 1758 } 1759 return rv; 1760 } 1761 #endif 1762 1763 /* 1764 * Add multicast source filter list to the interface list 1765 */ 1766 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1767 int sfcount, __be32 *psfsrc, int delta) 1768 { 1769 struct ip_mc_list *pmc; 1770 int isexclude; 1771 int i, err; 1772 1773 if (!in_dev) 1774 return -ENODEV; 1775 rcu_read_lock(); 1776 for_each_pmc_rcu(in_dev, pmc) { 1777 if (*pmca == pmc->multiaddr) 1778 break; 1779 } 1780 if (!pmc) { 1781 /* MCA not found?? bug */ 1782 rcu_read_unlock(); 1783 return -ESRCH; 1784 } 1785 spin_lock_bh(&pmc->lock); 1786 rcu_read_unlock(); 1787 1788 #ifdef CONFIG_IP_MULTICAST 1789 sf_markstate(pmc); 1790 #endif 1791 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1792 if (!delta) 1793 pmc->sfcount[sfmode]++; 1794 err = 0; 1795 for (i = 0; i < sfcount; i++) { 1796 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1797 if (err) 1798 break; 1799 } 1800 if (err) { 1801 int j; 1802 1803 if (!delta) 1804 pmc->sfcount[sfmode]--; 1805 for (j = 0; j < i; j++) 1806 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1807 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1808 #ifdef CONFIG_IP_MULTICAST 1809 struct ip_sf_list *psf; 1810 in_dev = pmc->interface; 1811 #endif 1812 1813 /* filter mode change */ 1814 if (pmc->sfcount[MCAST_EXCLUDE]) 1815 pmc->sfmode = MCAST_EXCLUDE; 1816 else if (pmc->sfcount[MCAST_INCLUDE]) 1817 pmc->sfmode = MCAST_INCLUDE; 1818 #ifdef CONFIG_IP_MULTICAST 1819 /* else no filters; keep old mode for reports */ 1820 1821 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1822 IGMP_Unsolicited_Report_Count; 1823 in_dev->mr_ifc_count = pmc->crcount; 1824 for (psf = pmc->sources; psf; psf = psf->sf_next) 1825 psf->sf_crcount = 0; 1826 igmp_ifc_event(in_dev); 1827 } else if (sf_setstate(pmc)) { 1828 igmp_ifc_event(in_dev); 1829 #endif 1830 } 1831 spin_unlock_bh(&pmc->lock); 1832 return err; 1833 } 1834 1835 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1836 { 1837 struct ip_sf_list *psf, *nextpsf; 1838 1839 for (psf = pmc->tomb; psf; psf = nextpsf) { 1840 nextpsf = psf->sf_next; 1841 kfree(psf); 1842 } 1843 pmc->tomb = NULL; 1844 for (psf = pmc->sources; psf; psf = nextpsf) { 1845 nextpsf = psf->sf_next; 1846 kfree(psf); 1847 } 1848 pmc->sources = NULL; 1849 pmc->sfmode = MCAST_EXCLUDE; 1850 pmc->sfcount[MCAST_INCLUDE] = 0; 1851 pmc->sfcount[MCAST_EXCLUDE] = 1; 1852 } 1853 1854 1855 /* 1856 * Join a multicast group 1857 */ 1858 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1859 { 1860 int err; 1861 __be32 addr = imr->imr_multiaddr.s_addr; 1862 struct ip_mc_socklist *iml = NULL, *i; 1863 struct in_device *in_dev; 1864 struct inet_sock *inet = inet_sk(sk); 1865 struct net *net = sock_net(sk); 1866 int ifindex; 1867 int count = 0; 1868 1869 if (!ipv4_is_multicast(addr)) 1870 return -EINVAL; 1871 1872 rtnl_lock(); 1873 1874 in_dev = ip_mc_find_dev(net, imr); 1875 1876 if (!in_dev) { 1877 iml = NULL; 1878 err = -ENODEV; 1879 goto done; 1880 } 1881 1882 err = -EADDRINUSE; 1883 ifindex = imr->imr_ifindex; 1884 for_each_pmc_rtnl(inet, i) { 1885 if (i->multi.imr_multiaddr.s_addr == addr && 1886 i->multi.imr_ifindex == ifindex) 1887 goto done; 1888 count++; 1889 } 1890 err = -ENOBUFS; 1891 if (count >= sysctl_igmp_max_memberships) 1892 goto done; 1893 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1894 if (iml == NULL) 1895 goto done; 1896 1897 memcpy(&iml->multi, imr, sizeof(*imr)); 1898 iml->next_rcu = inet->mc_list; 1899 iml->sflist = NULL; 1900 iml->sfmode = MCAST_EXCLUDE; 1901 rcu_assign_pointer(inet->mc_list, iml); 1902 ip_mc_inc_group(in_dev, addr); 1903 err = 0; 1904 done: 1905 rtnl_unlock(); 1906 return err; 1907 } 1908 EXPORT_SYMBOL(ip_mc_join_group); 1909 1910 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1911 struct in_device *in_dev) 1912 { 1913 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1914 int err; 1915 1916 if (psf == NULL) { 1917 /* any-source empty exclude case */ 1918 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1919 iml->sfmode, 0, NULL, 0); 1920 } 1921 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1922 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1923 RCU_INIT_POINTER(iml->sflist, NULL); 1924 /* decrease mem now to avoid the memleak warning */ 1925 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1926 kfree_rcu(psf, rcu); 1927 return err; 1928 } 1929 1930 /* 1931 * Ask a socket to leave a group. 1932 */ 1933 1934 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1935 { 1936 struct inet_sock *inet = inet_sk(sk); 1937 struct ip_mc_socklist *iml; 1938 struct ip_mc_socklist __rcu **imlp; 1939 struct in_device *in_dev; 1940 struct net *net = sock_net(sk); 1941 __be32 group = imr->imr_multiaddr.s_addr; 1942 u32 ifindex; 1943 int ret = -EADDRNOTAVAIL; 1944 1945 rtnl_lock(); 1946 in_dev = ip_mc_find_dev(net, imr); 1947 ifindex = imr->imr_ifindex; 1948 for (imlp = &inet->mc_list; 1949 (iml = rtnl_dereference(*imlp)) != NULL; 1950 imlp = &iml->next_rcu) { 1951 if (iml->multi.imr_multiaddr.s_addr != group) 1952 continue; 1953 if (ifindex) { 1954 if (iml->multi.imr_ifindex != ifindex) 1955 continue; 1956 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1957 iml->multi.imr_address.s_addr) 1958 continue; 1959 1960 (void) ip_mc_leave_src(sk, iml, in_dev); 1961 1962 *imlp = iml->next_rcu; 1963 1964 if (in_dev) 1965 ip_mc_dec_group(in_dev, group); 1966 rtnl_unlock(); 1967 /* decrease mem now to avoid the memleak warning */ 1968 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1969 kfree_rcu(iml, rcu); 1970 return 0; 1971 } 1972 if (!in_dev) 1973 ret = -ENODEV; 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_dereference(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_printf(seq, 2690 "%3s %6s " 2691 "%10s %10s %6s %6s\n", "Idx", 2692 "Device", "MCA", 2693 "SRC", "INC", "EXC"); 2694 } else { 2695 seq_printf(seq, 2696 "%3d %6.6s 0x%08x " 2697 "0x%08x %6lu %6lu\n", 2698 state->dev->ifindex, state->dev->name, 2699 ntohl(state->im->multiaddr), 2700 ntohl(psf->sf_inaddr), 2701 psf->sf_count[MCAST_INCLUDE], 2702 psf->sf_count[MCAST_EXCLUDE]); 2703 } 2704 return 0; 2705 } 2706 2707 static const struct seq_operations igmp_mcf_seq_ops = { 2708 .start = igmp_mcf_seq_start, 2709 .next = igmp_mcf_seq_next, 2710 .stop = igmp_mcf_seq_stop, 2711 .show = igmp_mcf_seq_show, 2712 }; 2713 2714 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2715 { 2716 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2717 sizeof(struct igmp_mcf_iter_state)); 2718 } 2719 2720 static const struct file_operations igmp_mcf_seq_fops = { 2721 .owner = THIS_MODULE, 2722 .open = igmp_mcf_seq_open, 2723 .read = seq_read, 2724 .llseek = seq_lseek, 2725 .release = seq_release_net, 2726 }; 2727 2728 static int __net_init igmp_net_init(struct net *net) 2729 { 2730 struct proc_dir_entry *pde; 2731 2732 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); 2733 if (!pde) 2734 goto out_igmp; 2735 pde = proc_create("mcfilter", S_IRUGO, net->proc_net, 2736 &igmp_mcf_seq_fops); 2737 if (!pde) 2738 goto out_mcfilter; 2739 return 0; 2740 2741 out_mcfilter: 2742 remove_proc_entry("igmp", net->proc_net); 2743 out_igmp: 2744 return -ENOMEM; 2745 } 2746 2747 static void __net_exit igmp_net_exit(struct net *net) 2748 { 2749 remove_proc_entry("mcfilter", net->proc_net); 2750 remove_proc_entry("igmp", net->proc_net); 2751 } 2752 2753 static struct pernet_operations igmp_net_ops = { 2754 .init = igmp_net_init, 2755 .exit = igmp_net_exit, 2756 }; 2757 #endif 2758 2759 static int igmp_netdev_event(struct notifier_block *this, 2760 unsigned long event, void *ptr) 2761 { 2762 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2763 struct in_device *in_dev; 2764 2765 switch (event) { 2766 case NETDEV_RESEND_IGMP: 2767 in_dev = __in_dev_get_rtnl(dev); 2768 if (in_dev) 2769 ip_mc_rejoin_groups(in_dev); 2770 break; 2771 default: 2772 break; 2773 } 2774 return NOTIFY_DONE; 2775 } 2776 2777 static struct notifier_block igmp_notifier = { 2778 .notifier_call = igmp_netdev_event, 2779 }; 2780 2781 int __init igmp_mc_init(void) 2782 { 2783 #if defined(CONFIG_PROC_FS) 2784 int err; 2785 2786 err = register_pernet_subsys(&igmp_net_ops); 2787 if (err) 2788 return err; 2789 err = register_netdevice_notifier(&igmp_notifier); 2790 if (err) 2791 goto reg_notif_fail; 2792 return 0; 2793 2794 reg_notif_fail: 2795 unregister_pernet_subsys(&igmp_net_ops); 2796 return err; 2797 #else 2798 return register_netdevice_notifier(&igmp_notifier); 2799 #endif 2800 } 2801