1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * This code implements the IGMP protocol as defined in RFC1112. There has 5 * been a further revision of this protocol since which is now supported. 6 * 7 * If you have trouble with this module be careful what gcc you have used, 8 * the older version didn't come out right using gcc 2.5.8, the newer one 9 * seems to fall out with gcc 2.6.2. 10 * 11 * Authors: 12 * Alan Cox <alan@lxorguk.ukuu.org.uk> 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 * Fixes: 20 * 21 * Alan Cox : Added lots of __inline__ to optimise 22 * the memory usage of all the tiny little 23 * functions. 24 * Alan Cox : Dumped the header building experiment. 25 * Alan Cox : Minor tweaks ready for multicast routing 26 * and extended IGMP protocol. 27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 28 * writes utterly bogus code otherwise (sigh) 29 * fixed IGMP loopback to behave in the manner 30 * desired by mrouted, fixed the fact it has been 31 * broken since 1.3.6 and cleaned up a few minor 32 * points. 33 * 34 * Chih-Jen Chang : Tried to revise IGMP to Version 2 35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 36 * The enhancements are mainly based on Steve Deering's 37 * ipmulti-3.5 source code. 38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 40 * the mrouted version on that device. 41 * Chih-Jen Chang : Added the max_resp_time parameter to 42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 43 * to identify the multicast router version 44 * and do what the IGMP version 2 specified. 45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 46 * Tsu-Sheng Tsao if the specified time expired. 47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 48 * Alan Cox : Use GFP_ATOMIC in the right places. 49 * Christian Daudt : igmp timer wasn't set for local group 50 * memberships but was being deleted, 51 * which caused a "del_timer() called 52 * from %p with timer not initialized\n" 53 * message (960131). 54 * Christian Daudt : removed del_timer from 55 * igmp_timer_expire function (960205). 56 * Christian Daudt : igmp_heard_report now only calls 57 * igmp_timer_expire if tm->running is 58 * true (960216). 59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 60 * igmp_heard_query never trigger. Expiry 61 * miscalculation fixed in igmp_heard_query 62 * and random() made to return unsigned to 63 * prevent negative expiry times. 64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 65 * fix from pending 2.1.x patches. 66 * Alan Cox: Forget to enable FDDI support earlier. 67 * Alexey Kuznetsov: Fixed leaving groups on device down. 68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 69 * David L Stevens: IGMPv3 support, with help from 70 * Vinay Kulkarni 71 */ 72 73 #include <linux/module.h> 74 #include <linux/slab.h> 75 #include <asm/uaccess.h> 76 #include <asm/system.h> 77 #include <linux/types.h> 78 #include <linux/kernel.h> 79 #include <linux/jiffies.h> 80 #include <linux/string.h> 81 #include <linux/socket.h> 82 #include <linux/sockios.h> 83 #include <linux/in.h> 84 #include <linux/inet.h> 85 #include <linux/netdevice.h> 86 #include <linux/skbuff.h> 87 #include <linux/inetdevice.h> 88 #include <linux/igmp.h> 89 #include <linux/if_arp.h> 90 #include <linux/rtnetlink.h> 91 #include <linux/times.h> 92 93 #include <net/net_namespace.h> 94 #include <net/arp.h> 95 #include <net/ip.h> 96 #include <net/protocol.h> 97 #include <net/route.h> 98 #include <net/sock.h> 99 #include <net/checksum.h> 100 #include <linux/netfilter_ipv4.h> 101 #ifdef CONFIG_IP_MROUTE 102 #include <linux/mroute.h> 103 #endif 104 #ifdef CONFIG_PROC_FS 105 #include <linux/proc_fs.h> 106 #include <linux/seq_file.h> 107 #endif 108 109 #define IP_MAX_MEMBERSHIPS 20 110 #define IP_MAX_MSF 10 111 112 #ifdef CONFIG_IP_MULTICAST 113 /* Parameter names and values are taken from igmp-v2-06 draft */ 114 115 #define IGMP_V1_Router_Present_Timeout (400*HZ) 116 #define IGMP_V2_Router_Present_Timeout (400*HZ) 117 #define IGMP_Unsolicited_Report_Interval (10*HZ) 118 #define IGMP_Query_Response_Interval (10*HZ) 119 #define IGMP_Unsolicited_Report_Count 2 120 121 122 #define IGMP_Initial_Report_Delay (1) 123 124 /* IGMP_Initial_Report_Delay is not from IGMP specs! 125 * IGMP specs require to report membership immediately after 126 * joining a group, but we delay the first report by a 127 * small interval. It seems more natural and still does not 128 * contradict to specs provided this delay is small enough. 129 */ 130 131 #define IGMP_V1_SEEN(in_dev) \ 132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 134 ((in_dev)->mr_v1_seen && \ 135 time_before(jiffies, (in_dev)->mr_v1_seen))) 136 #define IGMP_V2_SEEN(in_dev) \ 137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 139 ((in_dev)->mr_v2_seen && \ 140 time_before(jiffies, (in_dev)->mr_v2_seen))) 141 142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 144 static void igmpv3_clear_delrec(struct in_device *in_dev); 145 static int sf_setstate(struct ip_mc_list *pmc); 146 static void sf_markstate(struct ip_mc_list *pmc); 147 #endif 148 static void ip_mc_clear_src(struct ip_mc_list *pmc); 149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 150 int sfcount, __be32 *psfsrc, int delta); 151 152 static void ip_ma_put(struct ip_mc_list *im) 153 { 154 if (atomic_dec_and_test(&im->refcnt)) { 155 in_dev_put(im->interface); 156 kfree_rcu(im, rcu); 157 } 158 } 159 160 #define for_each_pmc_rcu(in_dev, pmc) \ 161 for (pmc = rcu_dereference(in_dev->mc_list); \ 162 pmc != NULL; \ 163 pmc = rcu_dereference(pmc->next_rcu)) 164 165 #define for_each_pmc_rtnl(in_dev, pmc) \ 166 for (pmc = rtnl_dereference(in_dev->mc_list); \ 167 pmc != NULL; \ 168 pmc = rtnl_dereference(pmc->next_rcu)) 169 170 #ifdef CONFIG_IP_MULTICAST 171 172 /* 173 * Timer management 174 */ 175 176 static void igmp_stop_timer(struct ip_mc_list *im) 177 { 178 spin_lock_bh(&im->lock); 179 if (del_timer(&im->timer)) 180 atomic_dec(&im->refcnt); 181 im->tm_running = 0; 182 im->reporter = 0; 183 im->unsolicit_count = 0; 184 spin_unlock_bh(&im->lock); 185 } 186 187 /* It must be called with locked im->lock */ 188 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 189 { 190 int tv = net_random() % max_delay; 191 192 im->tm_running = 1; 193 if (!mod_timer(&im->timer, jiffies+tv+2)) 194 atomic_inc(&im->refcnt); 195 } 196 197 static void igmp_gq_start_timer(struct in_device *in_dev) 198 { 199 int tv = net_random() % in_dev->mr_maxdelay; 200 201 in_dev->mr_gq_running = 1; 202 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 203 in_dev_hold(in_dev); 204 } 205 206 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 207 { 208 int tv = net_random() % delay; 209 210 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 211 in_dev_hold(in_dev); 212 } 213 214 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 215 { 216 spin_lock_bh(&im->lock); 217 im->unsolicit_count = 0; 218 if (del_timer(&im->timer)) { 219 if ((long)(im->timer.expires-jiffies) < max_delay) { 220 add_timer(&im->timer); 221 im->tm_running = 1; 222 spin_unlock_bh(&im->lock); 223 return; 224 } 225 atomic_dec(&im->refcnt); 226 } 227 igmp_start_timer(im, max_delay); 228 spin_unlock_bh(&im->lock); 229 } 230 231 232 /* 233 * Send an IGMP report. 234 */ 235 236 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 237 238 239 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 240 int gdeleted, int sdeleted) 241 { 242 switch (type) { 243 case IGMPV3_MODE_IS_INCLUDE: 244 case IGMPV3_MODE_IS_EXCLUDE: 245 if (gdeleted || sdeleted) 246 return 0; 247 if (!(pmc->gsquery && !psf->sf_gsresp)) { 248 if (pmc->sfmode == MCAST_INCLUDE) 249 return 1; 250 /* don't include if this source is excluded 251 * in all filters 252 */ 253 if (psf->sf_count[MCAST_INCLUDE]) 254 return type == IGMPV3_MODE_IS_INCLUDE; 255 return pmc->sfcount[MCAST_EXCLUDE] == 256 psf->sf_count[MCAST_EXCLUDE]; 257 } 258 return 0; 259 case IGMPV3_CHANGE_TO_INCLUDE: 260 if (gdeleted || sdeleted) 261 return 0; 262 return psf->sf_count[MCAST_INCLUDE] != 0; 263 case IGMPV3_CHANGE_TO_EXCLUDE: 264 if (gdeleted || sdeleted) 265 return 0; 266 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 267 psf->sf_count[MCAST_INCLUDE]) 268 return 0; 269 return pmc->sfcount[MCAST_EXCLUDE] == 270 psf->sf_count[MCAST_EXCLUDE]; 271 case IGMPV3_ALLOW_NEW_SOURCES: 272 if (gdeleted || !psf->sf_crcount) 273 return 0; 274 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 275 case IGMPV3_BLOCK_OLD_SOURCES: 276 if (pmc->sfmode == MCAST_INCLUDE) 277 return gdeleted || (psf->sf_crcount && sdeleted); 278 return psf->sf_crcount && !gdeleted && !sdeleted; 279 } 280 return 0; 281 } 282 283 static int 284 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 285 { 286 struct ip_sf_list *psf; 287 int scount = 0; 288 289 for (psf=pmc->sources; psf; psf=psf->sf_next) { 290 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 291 continue; 292 scount++; 293 } 294 return scount; 295 } 296 297 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) 298 299 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 300 { 301 struct sk_buff *skb; 302 struct rtable *rt; 303 struct iphdr *pip; 304 struct igmpv3_report *pig; 305 struct net *net = dev_net(dev); 306 struct flowi4 fl4; 307 308 while (1) { 309 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), 310 GFP_ATOMIC | __GFP_NOWARN); 311 if (skb) 312 break; 313 size >>= 1; 314 if (size < 256) 315 return NULL; 316 } 317 igmp_skb_size(skb) = size; 318 319 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 320 0, 0, 321 IPPROTO_IGMP, 0, dev->ifindex); 322 if (IS_ERR(rt)) { 323 kfree_skb(skb); 324 return NULL; 325 } 326 327 skb_dst_set(skb, &rt->dst); 328 skb->dev = dev; 329 330 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 331 332 skb_reset_network_header(skb); 333 pip = ip_hdr(skb); 334 skb_put(skb, sizeof(struct iphdr) + 4); 335 336 pip->version = 4; 337 pip->ihl = (sizeof(struct iphdr)+4)>>2; 338 pip->tos = 0xc0; 339 pip->frag_off = htons(IP_DF); 340 pip->ttl = 1; 341 pip->daddr = fl4.daddr; 342 pip->saddr = fl4.saddr; 343 pip->protocol = IPPROTO_IGMP; 344 pip->tot_len = 0; /* filled in later */ 345 ip_select_ident(pip, &rt->dst, NULL); 346 ((u8*)&pip[1])[0] = IPOPT_RA; 347 ((u8*)&pip[1])[1] = 4; 348 ((u8*)&pip[1])[2] = 0; 349 ((u8*)&pip[1])[3] = 0; 350 351 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 352 skb_put(skb, sizeof(*pig)); 353 pig = igmpv3_report_hdr(skb); 354 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 355 pig->resv1 = 0; 356 pig->csum = 0; 357 pig->resv2 = 0; 358 pig->ngrec = 0; 359 return skb; 360 } 361 362 static int igmpv3_sendpack(struct sk_buff *skb) 363 { 364 struct igmphdr *pig = igmp_hdr(skb); 365 const int igmplen = skb->tail - skb->transport_header; 366 367 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 368 369 return ip_local_out(skb); 370 } 371 372 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 373 { 374 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 375 } 376 377 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 378 int type, struct igmpv3_grec **ppgr) 379 { 380 struct net_device *dev = pmc->interface->dev; 381 struct igmpv3_report *pih; 382 struct igmpv3_grec *pgr; 383 384 if (!skb) 385 skb = igmpv3_newpack(dev, dev->mtu); 386 if (!skb) 387 return NULL; 388 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 389 pgr->grec_type = type; 390 pgr->grec_auxwords = 0; 391 pgr->grec_nsrcs = 0; 392 pgr->grec_mca = pmc->multiaddr; 393 pih = igmpv3_report_hdr(skb); 394 pih->ngrec = htons(ntohs(pih->ngrec)+1); 395 *ppgr = pgr; 396 return skb; 397 } 398 399 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ 400 skb_tailroom(skb)) : 0) 401 402 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 403 int type, int gdeleted, int sdeleted) 404 { 405 struct net_device *dev = pmc->interface->dev; 406 struct igmpv3_report *pih; 407 struct igmpv3_grec *pgr = NULL; 408 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 409 int scount, stotal, first, isquery, truncate; 410 411 if (pmc->multiaddr == IGMP_ALL_HOSTS) 412 return skb; 413 414 isquery = type == IGMPV3_MODE_IS_INCLUDE || 415 type == IGMPV3_MODE_IS_EXCLUDE; 416 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 417 type == IGMPV3_CHANGE_TO_EXCLUDE; 418 419 stotal = scount = 0; 420 421 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 422 423 if (!*psf_list) 424 goto empty_source; 425 426 pih = skb ? igmpv3_report_hdr(skb) : NULL; 427 428 /* EX and TO_EX get a fresh packet, if needed */ 429 if (truncate) { 430 if (pih && pih->ngrec && 431 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 432 if (skb) 433 igmpv3_sendpack(skb); 434 skb = igmpv3_newpack(dev, dev->mtu); 435 } 436 } 437 first = 1; 438 psf_prev = NULL; 439 for (psf=*psf_list; psf; psf=psf_next) { 440 __be32 *psrc; 441 442 psf_next = psf->sf_next; 443 444 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 445 psf_prev = psf; 446 continue; 447 } 448 449 /* clear marks on query responses */ 450 if (isquery) 451 psf->sf_gsresp = 0; 452 453 if (AVAILABLE(skb) < sizeof(__be32) + 454 first*sizeof(struct igmpv3_grec)) { 455 if (truncate && !first) 456 break; /* truncate these */ 457 if (pgr) 458 pgr->grec_nsrcs = htons(scount); 459 if (skb) 460 igmpv3_sendpack(skb); 461 skb = igmpv3_newpack(dev, dev->mtu); 462 first = 1; 463 scount = 0; 464 } 465 if (first) { 466 skb = add_grhead(skb, pmc, type, &pgr); 467 first = 0; 468 } 469 if (!skb) 470 return NULL; 471 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 472 *psrc = psf->sf_inaddr; 473 scount++; stotal++; 474 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 475 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 476 psf->sf_crcount--; 477 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 478 if (psf_prev) 479 psf_prev->sf_next = psf->sf_next; 480 else 481 *psf_list = psf->sf_next; 482 kfree(psf); 483 continue; 484 } 485 } 486 psf_prev = psf; 487 } 488 489 empty_source: 490 if (!stotal) { 491 if (type == IGMPV3_ALLOW_NEW_SOURCES || 492 type == IGMPV3_BLOCK_OLD_SOURCES) 493 return skb; 494 if (pmc->crcount || isquery) { 495 /* make sure we have room for group header */ 496 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 497 igmpv3_sendpack(skb); 498 skb = NULL; /* add_grhead will get a new one */ 499 } 500 skb = add_grhead(skb, pmc, type, &pgr); 501 } 502 } 503 if (pgr) 504 pgr->grec_nsrcs = htons(scount); 505 506 if (isquery) 507 pmc->gsquery = 0; /* clear query state on report */ 508 return skb; 509 } 510 511 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 512 { 513 struct sk_buff *skb = NULL; 514 int type; 515 516 if (!pmc) { 517 rcu_read_lock(); 518 for_each_pmc_rcu(in_dev, pmc) { 519 if (pmc->multiaddr == IGMP_ALL_HOSTS) 520 continue; 521 spin_lock_bh(&pmc->lock); 522 if (pmc->sfcount[MCAST_EXCLUDE]) 523 type = IGMPV3_MODE_IS_EXCLUDE; 524 else 525 type = IGMPV3_MODE_IS_INCLUDE; 526 skb = add_grec(skb, pmc, type, 0, 0); 527 spin_unlock_bh(&pmc->lock); 528 } 529 rcu_read_unlock(); 530 } else { 531 spin_lock_bh(&pmc->lock); 532 if (pmc->sfcount[MCAST_EXCLUDE]) 533 type = IGMPV3_MODE_IS_EXCLUDE; 534 else 535 type = IGMPV3_MODE_IS_INCLUDE; 536 skb = add_grec(skb, pmc, type, 0, 0); 537 spin_unlock_bh(&pmc->lock); 538 } 539 if (!skb) 540 return 0; 541 return igmpv3_sendpack(skb); 542 } 543 544 /* 545 * remove zero-count source records from a source filter list 546 */ 547 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 548 { 549 struct ip_sf_list *psf_prev, *psf_next, *psf; 550 551 psf_prev = NULL; 552 for (psf=*ppsf; psf; psf = psf_next) { 553 psf_next = psf->sf_next; 554 if (psf->sf_crcount == 0) { 555 if (psf_prev) 556 psf_prev->sf_next = psf->sf_next; 557 else 558 *ppsf = psf->sf_next; 559 kfree(psf); 560 } else 561 psf_prev = psf; 562 } 563 } 564 565 static void igmpv3_send_cr(struct in_device *in_dev) 566 { 567 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 568 struct sk_buff *skb = NULL; 569 int type, dtype; 570 571 rcu_read_lock(); 572 spin_lock_bh(&in_dev->mc_tomb_lock); 573 574 /* deleted MCA's */ 575 pmc_prev = NULL; 576 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 577 pmc_next = pmc->next; 578 if (pmc->sfmode == MCAST_INCLUDE) { 579 type = IGMPV3_BLOCK_OLD_SOURCES; 580 dtype = IGMPV3_BLOCK_OLD_SOURCES; 581 skb = add_grec(skb, pmc, type, 1, 0); 582 skb = add_grec(skb, pmc, dtype, 1, 1); 583 } 584 if (pmc->crcount) { 585 if (pmc->sfmode == MCAST_EXCLUDE) { 586 type = IGMPV3_CHANGE_TO_INCLUDE; 587 skb = add_grec(skb, pmc, type, 1, 0); 588 } 589 pmc->crcount--; 590 if (pmc->crcount == 0) { 591 igmpv3_clear_zeros(&pmc->tomb); 592 igmpv3_clear_zeros(&pmc->sources); 593 } 594 } 595 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 596 if (pmc_prev) 597 pmc_prev->next = pmc_next; 598 else 599 in_dev->mc_tomb = pmc_next; 600 in_dev_put(pmc->interface); 601 kfree(pmc); 602 } else 603 pmc_prev = pmc; 604 } 605 spin_unlock_bh(&in_dev->mc_tomb_lock); 606 607 /* change recs */ 608 for_each_pmc_rcu(in_dev, pmc) { 609 spin_lock_bh(&pmc->lock); 610 if (pmc->sfcount[MCAST_EXCLUDE]) { 611 type = IGMPV3_BLOCK_OLD_SOURCES; 612 dtype = IGMPV3_ALLOW_NEW_SOURCES; 613 } else { 614 type = IGMPV3_ALLOW_NEW_SOURCES; 615 dtype = IGMPV3_BLOCK_OLD_SOURCES; 616 } 617 skb = add_grec(skb, pmc, type, 0, 0); 618 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 619 620 /* filter mode changes */ 621 if (pmc->crcount) { 622 if (pmc->sfmode == MCAST_EXCLUDE) 623 type = IGMPV3_CHANGE_TO_EXCLUDE; 624 else 625 type = IGMPV3_CHANGE_TO_INCLUDE; 626 skb = add_grec(skb, pmc, type, 0, 0); 627 pmc->crcount--; 628 } 629 spin_unlock_bh(&pmc->lock); 630 } 631 rcu_read_unlock(); 632 633 if (!skb) 634 return; 635 (void) igmpv3_sendpack(skb); 636 } 637 638 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 639 int type) 640 { 641 struct sk_buff *skb; 642 struct iphdr *iph; 643 struct igmphdr *ih; 644 struct rtable *rt; 645 struct net_device *dev = in_dev->dev; 646 struct net *net = dev_net(dev); 647 __be32 group = pmc ? pmc->multiaddr : 0; 648 struct flowi4 fl4; 649 __be32 dst; 650 651 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 652 return igmpv3_send_report(in_dev, pmc); 653 else if (type == IGMP_HOST_LEAVE_MESSAGE) 654 dst = IGMP_ALL_ROUTER; 655 else 656 dst = group; 657 658 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 659 0, 0, 660 IPPROTO_IGMP, 0, dev->ifindex); 661 if (IS_ERR(rt)) 662 return -1; 663 664 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 665 if (skb == NULL) { 666 ip_rt_put(rt); 667 return -1; 668 } 669 670 skb_dst_set(skb, &rt->dst); 671 672 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 673 674 skb_reset_network_header(skb); 675 iph = ip_hdr(skb); 676 skb_put(skb, sizeof(struct iphdr) + 4); 677 678 iph->version = 4; 679 iph->ihl = (sizeof(struct iphdr)+4)>>2; 680 iph->tos = 0xc0; 681 iph->frag_off = htons(IP_DF); 682 iph->ttl = 1; 683 iph->daddr = dst; 684 iph->saddr = fl4.saddr; 685 iph->protocol = IPPROTO_IGMP; 686 ip_select_ident(iph, &rt->dst, NULL); 687 ((u8*)&iph[1])[0] = IPOPT_RA; 688 ((u8*)&iph[1])[1] = 4; 689 ((u8*)&iph[1])[2] = 0; 690 ((u8*)&iph[1])[3] = 0; 691 692 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 693 ih->type = type; 694 ih->code = 0; 695 ih->csum = 0; 696 ih->group = group; 697 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 698 699 return ip_local_out(skb); 700 } 701 702 static void igmp_gq_timer_expire(unsigned long data) 703 { 704 struct in_device *in_dev = (struct in_device *)data; 705 706 in_dev->mr_gq_running = 0; 707 igmpv3_send_report(in_dev, NULL); 708 __in_dev_put(in_dev); 709 } 710 711 static void igmp_ifc_timer_expire(unsigned long data) 712 { 713 struct in_device *in_dev = (struct in_device *)data; 714 715 igmpv3_send_cr(in_dev); 716 if (in_dev->mr_ifc_count) { 717 in_dev->mr_ifc_count--; 718 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 719 } 720 __in_dev_put(in_dev); 721 } 722 723 static void igmp_ifc_event(struct in_device *in_dev) 724 { 725 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 726 return; 727 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 728 IGMP_Unsolicited_Report_Count; 729 igmp_ifc_start_timer(in_dev, 1); 730 } 731 732 733 static void igmp_timer_expire(unsigned long data) 734 { 735 struct ip_mc_list *im=(struct ip_mc_list *)data; 736 struct in_device *in_dev = im->interface; 737 738 spin_lock(&im->lock); 739 im->tm_running = 0; 740 741 if (im->unsolicit_count) { 742 im->unsolicit_count--; 743 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 744 } 745 im->reporter = 1; 746 spin_unlock(&im->lock); 747 748 if (IGMP_V1_SEEN(in_dev)) 749 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 750 else if (IGMP_V2_SEEN(in_dev)) 751 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 752 else 753 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 754 755 ip_ma_put(im); 756 } 757 758 /* mark EXCLUDE-mode sources */ 759 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 760 { 761 struct ip_sf_list *psf; 762 int i, scount; 763 764 scount = 0; 765 for (psf=pmc->sources; psf; psf=psf->sf_next) { 766 if (scount == nsrcs) 767 break; 768 for (i=0; i<nsrcs; i++) { 769 /* skip inactive filters */ 770 if (psf->sf_count[MCAST_INCLUDE] || 771 pmc->sfcount[MCAST_EXCLUDE] != 772 psf->sf_count[MCAST_EXCLUDE]) 773 continue; 774 if (srcs[i] == psf->sf_inaddr) { 775 scount++; 776 break; 777 } 778 } 779 } 780 pmc->gsquery = 0; 781 if (scount == nsrcs) /* all sources excluded */ 782 return 0; 783 return 1; 784 } 785 786 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 787 { 788 struct ip_sf_list *psf; 789 int i, scount; 790 791 if (pmc->sfmode == MCAST_EXCLUDE) 792 return igmp_xmarksources(pmc, nsrcs, srcs); 793 794 /* mark INCLUDE-mode sources */ 795 scount = 0; 796 for (psf=pmc->sources; psf; psf=psf->sf_next) { 797 if (scount == nsrcs) 798 break; 799 for (i=0; i<nsrcs; i++) 800 if (srcs[i] == psf->sf_inaddr) { 801 psf->sf_gsresp = 1; 802 scount++; 803 break; 804 } 805 } 806 if (!scount) { 807 pmc->gsquery = 0; 808 return 0; 809 } 810 pmc->gsquery = 1; 811 return 1; 812 } 813 814 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 815 { 816 struct ip_mc_list *im; 817 818 /* Timers are only set for non-local groups */ 819 820 if (group == IGMP_ALL_HOSTS) 821 return; 822 823 rcu_read_lock(); 824 for_each_pmc_rcu(in_dev, im) { 825 if (im->multiaddr == group) { 826 igmp_stop_timer(im); 827 break; 828 } 829 } 830 rcu_read_unlock(); 831 } 832 833 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 834 int len) 835 { 836 struct igmphdr *ih = igmp_hdr(skb); 837 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 838 struct ip_mc_list *im; 839 __be32 group = ih->group; 840 int max_delay; 841 int mark = 0; 842 843 844 if (len == 8) { 845 if (ih->code == 0) { 846 /* Alas, old v1 router presents here. */ 847 848 max_delay = IGMP_Query_Response_Interval; 849 in_dev->mr_v1_seen = jiffies + 850 IGMP_V1_Router_Present_Timeout; 851 group = 0; 852 } else { 853 /* v2 router present */ 854 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 855 in_dev->mr_v2_seen = jiffies + 856 IGMP_V2_Router_Present_Timeout; 857 } 858 /* cancel the interface change timer */ 859 in_dev->mr_ifc_count = 0; 860 if (del_timer(&in_dev->mr_ifc_timer)) 861 __in_dev_put(in_dev); 862 /* clear deleted report items */ 863 igmpv3_clear_delrec(in_dev); 864 } else if (len < 12) { 865 return; /* ignore bogus packet; freed by caller */ 866 } else if (IGMP_V1_SEEN(in_dev)) { 867 /* This is a v3 query with v1 queriers present */ 868 max_delay = IGMP_Query_Response_Interval; 869 group = 0; 870 } else if (IGMP_V2_SEEN(in_dev)) { 871 /* this is a v3 query with v2 queriers present; 872 * Interpretation of the max_delay code is problematic here. 873 * A real v2 host would use ih_code directly, while v3 has a 874 * different encoding. We use the v3 encoding as more likely 875 * to be intended in a v3 query. 876 */ 877 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 878 } else { /* v3 */ 879 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 880 return; 881 882 ih3 = igmpv3_query_hdr(skb); 883 if (ih3->nsrcs) { 884 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 885 + ntohs(ih3->nsrcs)*sizeof(__be32))) 886 return; 887 ih3 = igmpv3_query_hdr(skb); 888 } 889 890 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 891 if (!max_delay) 892 max_delay = 1; /* can't mod w/ 0 */ 893 in_dev->mr_maxdelay = max_delay; 894 if (ih3->qrv) 895 in_dev->mr_qrv = ih3->qrv; 896 if (!group) { /* general query */ 897 if (ih3->nsrcs) 898 return; /* no sources allowed */ 899 igmp_gq_start_timer(in_dev); 900 return; 901 } 902 /* mark sources to include, if group & source-specific */ 903 mark = ih3->nsrcs != 0; 904 } 905 906 /* 907 * - Start the timers in all of our membership records 908 * that the query applies to for the interface on 909 * which the query arrived excl. those that belong 910 * to a "local" group (224.0.0.X) 911 * - For timers already running check if they need to 912 * be reset. 913 * - Use the igmp->igmp_code field as the maximum 914 * delay possible 915 */ 916 rcu_read_lock(); 917 for_each_pmc_rcu(in_dev, im) { 918 int changed; 919 920 if (group && group != im->multiaddr) 921 continue; 922 if (im->multiaddr == IGMP_ALL_HOSTS) 923 continue; 924 spin_lock_bh(&im->lock); 925 if (im->tm_running) 926 im->gsquery = im->gsquery && mark; 927 else 928 im->gsquery = mark; 929 changed = !im->gsquery || 930 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 931 spin_unlock_bh(&im->lock); 932 if (changed) 933 igmp_mod_timer(im, max_delay); 934 } 935 rcu_read_unlock(); 936 } 937 938 /* called in rcu_read_lock() section */ 939 int igmp_rcv(struct sk_buff *skb) 940 { 941 /* This basically follows the spec line by line -- see RFC1112 */ 942 struct igmphdr *ih; 943 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 944 int len = skb->len; 945 946 if (in_dev == NULL) 947 goto drop; 948 949 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 950 goto drop; 951 952 switch (skb->ip_summed) { 953 case CHECKSUM_COMPLETE: 954 if (!csum_fold(skb->csum)) 955 break; 956 /* fall through */ 957 case CHECKSUM_NONE: 958 skb->csum = 0; 959 if (__skb_checksum_complete(skb)) 960 goto drop; 961 } 962 963 ih = igmp_hdr(skb); 964 switch (ih->type) { 965 case IGMP_HOST_MEMBERSHIP_QUERY: 966 igmp_heard_query(in_dev, skb, len); 967 break; 968 case IGMP_HOST_MEMBERSHIP_REPORT: 969 case IGMPV2_HOST_MEMBERSHIP_REPORT: 970 /* Is it our report looped back? */ 971 if (rt_is_output_route(skb_rtable(skb))) 972 break; 973 /* don't rely on MC router hearing unicast reports */ 974 if (skb->pkt_type == PACKET_MULTICAST || 975 skb->pkt_type == PACKET_BROADCAST) 976 igmp_heard_report(in_dev, ih->group); 977 break; 978 case IGMP_PIM: 979 #ifdef CONFIG_IP_PIMSM_V1 980 return pim_rcv_v1(skb); 981 #endif 982 case IGMPV3_HOST_MEMBERSHIP_REPORT: 983 case IGMP_DVMRP: 984 case IGMP_TRACE: 985 case IGMP_HOST_LEAVE_MESSAGE: 986 case IGMP_MTRACE: 987 case IGMP_MTRACE_RESP: 988 break; 989 default: 990 break; 991 } 992 993 drop: 994 kfree_skb(skb); 995 return 0; 996 } 997 998 #endif 999 1000 1001 /* 1002 * Add a filter to a device 1003 */ 1004 1005 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1006 { 1007 char buf[MAX_ADDR_LEN]; 1008 struct net_device *dev = in_dev->dev; 1009 1010 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1011 We will get multicast token leakage, when IFF_MULTICAST 1012 is changed. This check should be done in dev->set_multicast_list 1013 routine. Something sort of: 1014 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1015 --ANK 1016 */ 1017 if (arp_mc_map(addr, buf, dev, 0) == 0) 1018 dev_mc_add(dev, buf); 1019 } 1020 1021 /* 1022 * Remove a filter from a device 1023 */ 1024 1025 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1026 { 1027 char buf[MAX_ADDR_LEN]; 1028 struct net_device *dev = in_dev->dev; 1029 1030 if (arp_mc_map(addr, buf, dev, 0) == 0) 1031 dev_mc_del(dev, buf); 1032 } 1033 1034 #ifdef CONFIG_IP_MULTICAST 1035 /* 1036 * deleted ip_mc_list manipulation 1037 */ 1038 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1039 { 1040 struct ip_mc_list *pmc; 1041 1042 /* this is an "ip_mc_list" for convenience; only the fields below 1043 * are actually used. In particular, the refcnt and users are not 1044 * used for management of the delete list. Using the same structure 1045 * for deleted items allows change reports to use common code with 1046 * non-deleted or query-response MCA's. 1047 */ 1048 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1049 if (!pmc) 1050 return; 1051 spin_lock_bh(&im->lock); 1052 pmc->interface = im->interface; 1053 in_dev_hold(in_dev); 1054 pmc->multiaddr = im->multiaddr; 1055 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1056 IGMP_Unsolicited_Report_Count; 1057 pmc->sfmode = im->sfmode; 1058 if (pmc->sfmode == MCAST_INCLUDE) { 1059 struct ip_sf_list *psf; 1060 1061 pmc->tomb = im->tomb; 1062 pmc->sources = im->sources; 1063 im->tomb = im->sources = NULL; 1064 for (psf=pmc->sources; psf; psf=psf->sf_next) 1065 psf->sf_crcount = pmc->crcount; 1066 } 1067 spin_unlock_bh(&im->lock); 1068 1069 spin_lock_bh(&in_dev->mc_tomb_lock); 1070 pmc->next = in_dev->mc_tomb; 1071 in_dev->mc_tomb = pmc; 1072 spin_unlock_bh(&in_dev->mc_tomb_lock); 1073 } 1074 1075 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1076 { 1077 struct ip_mc_list *pmc, *pmc_prev; 1078 struct ip_sf_list *psf, *psf_next; 1079 1080 spin_lock_bh(&in_dev->mc_tomb_lock); 1081 pmc_prev = NULL; 1082 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1083 if (pmc->multiaddr == multiaddr) 1084 break; 1085 pmc_prev = pmc; 1086 } 1087 if (pmc) { 1088 if (pmc_prev) 1089 pmc_prev->next = pmc->next; 1090 else 1091 in_dev->mc_tomb = pmc->next; 1092 } 1093 spin_unlock_bh(&in_dev->mc_tomb_lock); 1094 if (pmc) { 1095 for (psf=pmc->tomb; psf; psf=psf_next) { 1096 psf_next = psf->sf_next; 1097 kfree(psf); 1098 } 1099 in_dev_put(pmc->interface); 1100 kfree(pmc); 1101 } 1102 } 1103 1104 static void igmpv3_clear_delrec(struct in_device *in_dev) 1105 { 1106 struct ip_mc_list *pmc, *nextpmc; 1107 1108 spin_lock_bh(&in_dev->mc_tomb_lock); 1109 pmc = in_dev->mc_tomb; 1110 in_dev->mc_tomb = NULL; 1111 spin_unlock_bh(&in_dev->mc_tomb_lock); 1112 1113 for (; pmc; pmc = nextpmc) { 1114 nextpmc = pmc->next; 1115 ip_mc_clear_src(pmc); 1116 in_dev_put(pmc->interface); 1117 kfree(pmc); 1118 } 1119 /* clear dead sources, too */ 1120 rcu_read_lock(); 1121 for_each_pmc_rcu(in_dev, pmc) { 1122 struct ip_sf_list *psf, *psf_next; 1123 1124 spin_lock_bh(&pmc->lock); 1125 psf = pmc->tomb; 1126 pmc->tomb = NULL; 1127 spin_unlock_bh(&pmc->lock); 1128 for (; psf; psf=psf_next) { 1129 psf_next = psf->sf_next; 1130 kfree(psf); 1131 } 1132 } 1133 rcu_read_unlock(); 1134 } 1135 #endif 1136 1137 static void igmp_group_dropped(struct ip_mc_list *im) 1138 { 1139 struct in_device *in_dev = im->interface; 1140 #ifdef CONFIG_IP_MULTICAST 1141 int reporter; 1142 #endif 1143 1144 if (im->loaded) { 1145 im->loaded = 0; 1146 ip_mc_filter_del(in_dev, im->multiaddr); 1147 } 1148 1149 #ifdef CONFIG_IP_MULTICAST 1150 if (im->multiaddr == IGMP_ALL_HOSTS) 1151 return; 1152 1153 reporter = im->reporter; 1154 igmp_stop_timer(im); 1155 1156 if (!in_dev->dead) { 1157 if (IGMP_V1_SEEN(in_dev)) 1158 return; 1159 if (IGMP_V2_SEEN(in_dev)) { 1160 if (reporter) 1161 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1162 return; 1163 } 1164 /* IGMPv3 */ 1165 igmpv3_add_delrec(in_dev, im); 1166 1167 igmp_ifc_event(in_dev); 1168 } 1169 #endif 1170 } 1171 1172 static void igmp_group_added(struct ip_mc_list *im) 1173 { 1174 struct in_device *in_dev = im->interface; 1175 1176 if (im->loaded == 0) { 1177 im->loaded = 1; 1178 ip_mc_filter_add(in_dev, im->multiaddr); 1179 } 1180 1181 #ifdef CONFIG_IP_MULTICAST 1182 if (im->multiaddr == IGMP_ALL_HOSTS) 1183 return; 1184 1185 if (in_dev->dead) 1186 return; 1187 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1188 spin_lock_bh(&im->lock); 1189 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1190 spin_unlock_bh(&im->lock); 1191 return; 1192 } 1193 /* else, v3 */ 1194 1195 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1196 IGMP_Unsolicited_Report_Count; 1197 igmp_ifc_event(in_dev); 1198 #endif 1199 } 1200 1201 1202 /* 1203 * Multicast list managers 1204 */ 1205 1206 1207 /* 1208 * A socket has joined a multicast group on device dev. 1209 */ 1210 1211 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1212 { 1213 struct ip_mc_list *im; 1214 1215 ASSERT_RTNL(); 1216 1217 for_each_pmc_rtnl(in_dev, im) { 1218 if (im->multiaddr == addr) { 1219 im->users++; 1220 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1221 goto out; 1222 } 1223 } 1224 1225 im = kzalloc(sizeof(*im), GFP_KERNEL); 1226 if (!im) 1227 goto out; 1228 1229 im->users = 1; 1230 im->interface = in_dev; 1231 in_dev_hold(in_dev); 1232 im->multiaddr = addr; 1233 /* initial mode is (EX, empty) */ 1234 im->sfmode = MCAST_EXCLUDE; 1235 im->sfcount[MCAST_EXCLUDE] = 1; 1236 atomic_set(&im->refcnt, 1); 1237 spin_lock_init(&im->lock); 1238 #ifdef CONFIG_IP_MULTICAST 1239 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1240 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1241 #endif 1242 1243 im->next_rcu = in_dev->mc_list; 1244 in_dev->mc_count++; 1245 rcu_assign_pointer(in_dev->mc_list, im); 1246 1247 #ifdef CONFIG_IP_MULTICAST 1248 igmpv3_del_delrec(in_dev, im->multiaddr); 1249 #endif 1250 igmp_group_added(im); 1251 if (!in_dev->dead) 1252 ip_rt_multicast_event(in_dev); 1253 out: 1254 return; 1255 } 1256 EXPORT_SYMBOL(ip_mc_inc_group); 1257 1258 /* 1259 * Resend IGMP JOIN report; used for bonding. 1260 * Called with rcu_read_lock() 1261 */ 1262 void ip_mc_rejoin_groups(struct in_device *in_dev) 1263 { 1264 #ifdef CONFIG_IP_MULTICAST 1265 struct ip_mc_list *im; 1266 int type; 1267 1268 for_each_pmc_rcu(in_dev, im) { 1269 if (im->multiaddr == IGMP_ALL_HOSTS) 1270 continue; 1271 1272 /* a failover is happening and switches 1273 * must be notified immediately 1274 */ 1275 if (IGMP_V1_SEEN(in_dev)) 1276 type = IGMP_HOST_MEMBERSHIP_REPORT; 1277 else if (IGMP_V2_SEEN(in_dev)) 1278 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1279 else 1280 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1281 igmp_send_report(in_dev, im, type); 1282 } 1283 #endif 1284 } 1285 EXPORT_SYMBOL(ip_mc_rejoin_groups); 1286 1287 /* 1288 * A socket has left a multicast group on device dev 1289 */ 1290 1291 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1292 { 1293 struct ip_mc_list *i; 1294 struct ip_mc_list __rcu **ip; 1295 1296 ASSERT_RTNL(); 1297 1298 for (ip = &in_dev->mc_list; 1299 (i = rtnl_dereference(*ip)) != NULL; 1300 ip = &i->next_rcu) { 1301 if (i->multiaddr == addr) { 1302 if (--i->users == 0) { 1303 *ip = i->next_rcu; 1304 in_dev->mc_count--; 1305 igmp_group_dropped(i); 1306 ip_mc_clear_src(i); 1307 1308 if (!in_dev->dead) 1309 ip_rt_multicast_event(in_dev); 1310 1311 ip_ma_put(i); 1312 return; 1313 } 1314 break; 1315 } 1316 } 1317 } 1318 EXPORT_SYMBOL(ip_mc_dec_group); 1319 1320 /* Device changing type */ 1321 1322 void ip_mc_unmap(struct in_device *in_dev) 1323 { 1324 struct ip_mc_list *pmc; 1325 1326 ASSERT_RTNL(); 1327 1328 for_each_pmc_rtnl(in_dev, pmc) 1329 igmp_group_dropped(pmc); 1330 } 1331 1332 void ip_mc_remap(struct in_device *in_dev) 1333 { 1334 struct ip_mc_list *pmc; 1335 1336 ASSERT_RTNL(); 1337 1338 for_each_pmc_rtnl(in_dev, pmc) 1339 igmp_group_added(pmc); 1340 } 1341 1342 /* Device going down */ 1343 1344 void ip_mc_down(struct in_device *in_dev) 1345 { 1346 struct ip_mc_list *pmc; 1347 1348 ASSERT_RTNL(); 1349 1350 for_each_pmc_rtnl(in_dev, pmc) 1351 igmp_group_dropped(pmc); 1352 1353 #ifdef CONFIG_IP_MULTICAST 1354 in_dev->mr_ifc_count = 0; 1355 if (del_timer(&in_dev->mr_ifc_timer)) 1356 __in_dev_put(in_dev); 1357 in_dev->mr_gq_running = 0; 1358 if (del_timer(&in_dev->mr_gq_timer)) 1359 __in_dev_put(in_dev); 1360 igmpv3_clear_delrec(in_dev); 1361 #endif 1362 1363 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1364 } 1365 1366 void ip_mc_init_dev(struct in_device *in_dev) 1367 { 1368 ASSERT_RTNL(); 1369 1370 in_dev->mc_tomb = NULL; 1371 #ifdef CONFIG_IP_MULTICAST 1372 in_dev->mr_gq_running = 0; 1373 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1374 (unsigned long)in_dev); 1375 in_dev->mr_ifc_count = 0; 1376 in_dev->mc_count = 0; 1377 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1378 (unsigned long)in_dev); 1379 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1380 #endif 1381 1382 spin_lock_init(&in_dev->mc_tomb_lock); 1383 } 1384 1385 /* Device going up */ 1386 1387 void ip_mc_up(struct in_device *in_dev) 1388 { 1389 struct ip_mc_list *pmc; 1390 1391 ASSERT_RTNL(); 1392 1393 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1394 1395 for_each_pmc_rtnl(in_dev, pmc) 1396 igmp_group_added(pmc); 1397 } 1398 1399 /* 1400 * Device is about to be destroyed: clean up. 1401 */ 1402 1403 void ip_mc_destroy_dev(struct in_device *in_dev) 1404 { 1405 struct ip_mc_list *i; 1406 1407 ASSERT_RTNL(); 1408 1409 /* Deactivate timers */ 1410 ip_mc_down(in_dev); 1411 1412 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1413 in_dev->mc_list = i->next_rcu; 1414 in_dev->mc_count--; 1415 1416 /* We've dropped the groups in ip_mc_down already */ 1417 ip_mc_clear_src(i); 1418 ip_ma_put(i); 1419 } 1420 } 1421 1422 /* RTNL is locked */ 1423 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1424 { 1425 struct net_device *dev = NULL; 1426 struct in_device *idev = NULL; 1427 1428 if (imr->imr_ifindex) { 1429 idev = inetdev_by_index(net, imr->imr_ifindex); 1430 return idev; 1431 } 1432 if (imr->imr_address.s_addr) { 1433 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1434 if (!dev) 1435 return NULL; 1436 } 1437 1438 if (!dev) { 1439 struct rtable *rt = ip_route_output(net, 1440 imr->imr_multiaddr.s_addr, 1441 0, 0, 0); 1442 if (!IS_ERR(rt)) { 1443 dev = rt->dst.dev; 1444 ip_rt_put(rt); 1445 } 1446 } 1447 if (dev) { 1448 imr->imr_ifindex = dev->ifindex; 1449 idev = __in_dev_get_rtnl(dev); 1450 } 1451 return idev; 1452 } 1453 1454 /* 1455 * Join a socket to a group 1456 */ 1457 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1458 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1459 1460 1461 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1462 __be32 *psfsrc) 1463 { 1464 struct ip_sf_list *psf, *psf_prev; 1465 int rv = 0; 1466 1467 psf_prev = NULL; 1468 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1469 if (psf->sf_inaddr == *psfsrc) 1470 break; 1471 psf_prev = psf; 1472 } 1473 if (!psf || psf->sf_count[sfmode] == 0) { 1474 /* source filter not found, or count wrong => bug */ 1475 return -ESRCH; 1476 } 1477 psf->sf_count[sfmode]--; 1478 if (psf->sf_count[sfmode] == 0) { 1479 ip_rt_multicast_event(pmc->interface); 1480 } 1481 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1482 #ifdef CONFIG_IP_MULTICAST 1483 struct in_device *in_dev = pmc->interface; 1484 #endif 1485 1486 /* no more filters for this source */ 1487 if (psf_prev) 1488 psf_prev->sf_next = psf->sf_next; 1489 else 1490 pmc->sources = psf->sf_next; 1491 #ifdef CONFIG_IP_MULTICAST 1492 if (psf->sf_oldin && 1493 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1494 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1495 IGMP_Unsolicited_Report_Count; 1496 psf->sf_next = pmc->tomb; 1497 pmc->tomb = psf; 1498 rv = 1; 1499 } else 1500 #endif 1501 kfree(psf); 1502 } 1503 return rv; 1504 } 1505 1506 #ifndef CONFIG_IP_MULTICAST 1507 #define igmp_ifc_event(x) do { } while (0) 1508 #endif 1509 1510 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1511 int sfcount, __be32 *psfsrc, int delta) 1512 { 1513 struct ip_mc_list *pmc; 1514 int changerec = 0; 1515 int i, err; 1516 1517 if (!in_dev) 1518 return -ENODEV; 1519 rcu_read_lock(); 1520 for_each_pmc_rcu(in_dev, pmc) { 1521 if (*pmca == pmc->multiaddr) 1522 break; 1523 } 1524 if (!pmc) { 1525 /* MCA not found?? bug */ 1526 rcu_read_unlock(); 1527 return -ESRCH; 1528 } 1529 spin_lock_bh(&pmc->lock); 1530 rcu_read_unlock(); 1531 #ifdef CONFIG_IP_MULTICAST 1532 sf_markstate(pmc); 1533 #endif 1534 if (!delta) { 1535 err = -EINVAL; 1536 if (!pmc->sfcount[sfmode]) 1537 goto out_unlock; 1538 pmc->sfcount[sfmode]--; 1539 } 1540 err = 0; 1541 for (i=0; i<sfcount; i++) { 1542 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1543 1544 changerec |= rv > 0; 1545 if (!err && rv < 0) 1546 err = rv; 1547 } 1548 if (pmc->sfmode == MCAST_EXCLUDE && 1549 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1550 pmc->sfcount[MCAST_INCLUDE]) { 1551 #ifdef CONFIG_IP_MULTICAST 1552 struct ip_sf_list *psf; 1553 #endif 1554 1555 /* filter mode change */ 1556 pmc->sfmode = MCAST_INCLUDE; 1557 #ifdef CONFIG_IP_MULTICAST 1558 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1559 IGMP_Unsolicited_Report_Count; 1560 in_dev->mr_ifc_count = pmc->crcount; 1561 for (psf=pmc->sources; psf; psf = psf->sf_next) 1562 psf->sf_crcount = 0; 1563 igmp_ifc_event(pmc->interface); 1564 } else if (sf_setstate(pmc) || changerec) { 1565 igmp_ifc_event(pmc->interface); 1566 #endif 1567 } 1568 out_unlock: 1569 spin_unlock_bh(&pmc->lock); 1570 return err; 1571 } 1572 1573 /* 1574 * Add multicast single-source filter to the interface list 1575 */ 1576 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1577 __be32 *psfsrc, int delta) 1578 { 1579 struct ip_sf_list *psf, *psf_prev; 1580 1581 psf_prev = NULL; 1582 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1583 if (psf->sf_inaddr == *psfsrc) 1584 break; 1585 psf_prev = psf; 1586 } 1587 if (!psf) { 1588 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1589 if (!psf) 1590 return -ENOBUFS; 1591 psf->sf_inaddr = *psfsrc; 1592 if (psf_prev) { 1593 psf_prev->sf_next = psf; 1594 } else 1595 pmc->sources = psf; 1596 } 1597 psf->sf_count[sfmode]++; 1598 if (psf->sf_count[sfmode] == 1) { 1599 ip_rt_multicast_event(pmc->interface); 1600 } 1601 return 0; 1602 } 1603 1604 #ifdef CONFIG_IP_MULTICAST 1605 static void sf_markstate(struct ip_mc_list *pmc) 1606 { 1607 struct ip_sf_list *psf; 1608 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1609 1610 for (psf=pmc->sources; psf; psf=psf->sf_next) 1611 if (pmc->sfcount[MCAST_EXCLUDE]) { 1612 psf->sf_oldin = mca_xcount == 1613 psf->sf_count[MCAST_EXCLUDE] && 1614 !psf->sf_count[MCAST_INCLUDE]; 1615 } else 1616 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1617 } 1618 1619 static int sf_setstate(struct ip_mc_list *pmc) 1620 { 1621 struct ip_sf_list *psf, *dpsf; 1622 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1623 int qrv = pmc->interface->mr_qrv; 1624 int new_in, rv; 1625 1626 rv = 0; 1627 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1628 if (pmc->sfcount[MCAST_EXCLUDE]) { 1629 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1630 !psf->sf_count[MCAST_INCLUDE]; 1631 } else 1632 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1633 if (new_in) { 1634 if (!psf->sf_oldin) { 1635 struct ip_sf_list *prev = NULL; 1636 1637 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1638 if (dpsf->sf_inaddr == psf->sf_inaddr) 1639 break; 1640 prev = dpsf; 1641 } 1642 if (dpsf) { 1643 if (prev) 1644 prev->sf_next = dpsf->sf_next; 1645 else 1646 pmc->tomb = dpsf->sf_next; 1647 kfree(dpsf); 1648 } 1649 psf->sf_crcount = qrv; 1650 rv++; 1651 } 1652 } else if (psf->sf_oldin) { 1653 1654 psf->sf_crcount = 0; 1655 /* 1656 * add or update "delete" records if an active filter 1657 * is now inactive 1658 */ 1659 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1660 if (dpsf->sf_inaddr == psf->sf_inaddr) 1661 break; 1662 if (!dpsf) { 1663 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1664 if (!dpsf) 1665 continue; 1666 *dpsf = *psf; 1667 /* pmc->lock held by callers */ 1668 dpsf->sf_next = pmc->tomb; 1669 pmc->tomb = dpsf; 1670 } 1671 dpsf->sf_crcount = qrv; 1672 rv++; 1673 } 1674 } 1675 return rv; 1676 } 1677 #endif 1678 1679 /* 1680 * Add multicast source filter list to the interface list 1681 */ 1682 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1683 int sfcount, __be32 *psfsrc, int delta) 1684 { 1685 struct ip_mc_list *pmc; 1686 int isexclude; 1687 int i, err; 1688 1689 if (!in_dev) 1690 return -ENODEV; 1691 rcu_read_lock(); 1692 for_each_pmc_rcu(in_dev, pmc) { 1693 if (*pmca == pmc->multiaddr) 1694 break; 1695 } 1696 if (!pmc) { 1697 /* MCA not found?? bug */ 1698 rcu_read_unlock(); 1699 return -ESRCH; 1700 } 1701 spin_lock_bh(&pmc->lock); 1702 rcu_read_unlock(); 1703 1704 #ifdef CONFIG_IP_MULTICAST 1705 sf_markstate(pmc); 1706 #endif 1707 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1708 if (!delta) 1709 pmc->sfcount[sfmode]++; 1710 err = 0; 1711 for (i=0; i<sfcount; i++) { 1712 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1713 if (err) 1714 break; 1715 } 1716 if (err) { 1717 int j; 1718 1719 pmc->sfcount[sfmode]--; 1720 for (j=0; j<i; j++) 1721 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1722 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1723 #ifdef CONFIG_IP_MULTICAST 1724 struct ip_sf_list *psf; 1725 in_dev = pmc->interface; 1726 #endif 1727 1728 /* filter mode change */ 1729 if (pmc->sfcount[MCAST_EXCLUDE]) 1730 pmc->sfmode = MCAST_EXCLUDE; 1731 else if (pmc->sfcount[MCAST_INCLUDE]) 1732 pmc->sfmode = MCAST_INCLUDE; 1733 #ifdef CONFIG_IP_MULTICAST 1734 /* else no filters; keep old mode for reports */ 1735 1736 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1737 IGMP_Unsolicited_Report_Count; 1738 in_dev->mr_ifc_count = pmc->crcount; 1739 for (psf=pmc->sources; psf; psf = psf->sf_next) 1740 psf->sf_crcount = 0; 1741 igmp_ifc_event(in_dev); 1742 } else if (sf_setstate(pmc)) { 1743 igmp_ifc_event(in_dev); 1744 #endif 1745 } 1746 spin_unlock_bh(&pmc->lock); 1747 return err; 1748 } 1749 1750 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1751 { 1752 struct ip_sf_list *psf, *nextpsf; 1753 1754 for (psf=pmc->tomb; psf; psf=nextpsf) { 1755 nextpsf = psf->sf_next; 1756 kfree(psf); 1757 } 1758 pmc->tomb = NULL; 1759 for (psf=pmc->sources; psf; psf=nextpsf) { 1760 nextpsf = psf->sf_next; 1761 kfree(psf); 1762 } 1763 pmc->sources = NULL; 1764 pmc->sfmode = MCAST_EXCLUDE; 1765 pmc->sfcount[MCAST_INCLUDE] = 0; 1766 pmc->sfcount[MCAST_EXCLUDE] = 1; 1767 } 1768 1769 1770 /* 1771 * Join a multicast group 1772 */ 1773 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1774 { 1775 int err; 1776 __be32 addr = imr->imr_multiaddr.s_addr; 1777 struct ip_mc_socklist *iml = NULL, *i; 1778 struct in_device *in_dev; 1779 struct inet_sock *inet = inet_sk(sk); 1780 struct net *net = sock_net(sk); 1781 int ifindex; 1782 int count = 0; 1783 1784 if (!ipv4_is_multicast(addr)) 1785 return -EINVAL; 1786 1787 rtnl_lock(); 1788 1789 in_dev = ip_mc_find_dev(net, imr); 1790 1791 if (!in_dev) { 1792 iml = NULL; 1793 err = -ENODEV; 1794 goto done; 1795 } 1796 1797 err = -EADDRINUSE; 1798 ifindex = imr->imr_ifindex; 1799 for_each_pmc_rtnl(inet, i) { 1800 if (i->multi.imr_multiaddr.s_addr == addr && 1801 i->multi.imr_ifindex == ifindex) 1802 goto done; 1803 count++; 1804 } 1805 err = -ENOBUFS; 1806 if (count >= sysctl_igmp_max_memberships) 1807 goto done; 1808 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1809 if (iml == NULL) 1810 goto done; 1811 1812 memcpy(&iml->multi, imr, sizeof(*imr)); 1813 iml->next_rcu = inet->mc_list; 1814 iml->sflist = NULL; 1815 iml->sfmode = MCAST_EXCLUDE; 1816 rcu_assign_pointer(inet->mc_list, iml); 1817 ip_mc_inc_group(in_dev, addr); 1818 err = 0; 1819 done: 1820 rtnl_unlock(); 1821 return err; 1822 } 1823 EXPORT_SYMBOL(ip_mc_join_group); 1824 1825 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1826 struct in_device *in_dev) 1827 { 1828 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1829 int err; 1830 1831 if (psf == NULL) { 1832 /* any-source empty exclude case */ 1833 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1834 iml->sfmode, 0, NULL, 0); 1835 } 1836 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1837 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1838 rcu_assign_pointer(iml->sflist, NULL); 1839 /* decrease mem now to avoid the memleak warning */ 1840 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1841 kfree_rcu(psf, rcu); 1842 return err; 1843 } 1844 1845 /* 1846 * Ask a socket to leave a group. 1847 */ 1848 1849 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1850 { 1851 struct inet_sock *inet = inet_sk(sk); 1852 struct ip_mc_socklist *iml; 1853 struct ip_mc_socklist __rcu **imlp; 1854 struct in_device *in_dev; 1855 struct net *net = sock_net(sk); 1856 __be32 group = imr->imr_multiaddr.s_addr; 1857 u32 ifindex; 1858 int ret = -EADDRNOTAVAIL; 1859 1860 rtnl_lock(); 1861 in_dev = ip_mc_find_dev(net, imr); 1862 ifindex = imr->imr_ifindex; 1863 for (imlp = &inet->mc_list; 1864 (iml = rtnl_dereference(*imlp)) != NULL; 1865 imlp = &iml->next_rcu) { 1866 if (iml->multi.imr_multiaddr.s_addr != group) 1867 continue; 1868 if (ifindex) { 1869 if (iml->multi.imr_ifindex != ifindex) 1870 continue; 1871 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1872 iml->multi.imr_address.s_addr) 1873 continue; 1874 1875 (void) ip_mc_leave_src(sk, iml, in_dev); 1876 1877 *imlp = iml->next_rcu; 1878 1879 if (in_dev) 1880 ip_mc_dec_group(in_dev, group); 1881 rtnl_unlock(); 1882 /* decrease mem now to avoid the memleak warning */ 1883 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1884 kfree_rcu(iml, rcu); 1885 return 0; 1886 } 1887 if (!in_dev) 1888 ret = -ENODEV; 1889 rtnl_unlock(); 1890 return ret; 1891 } 1892 1893 int ip_mc_source(int add, int omode, struct sock *sk, struct 1894 ip_mreq_source *mreqs, int ifindex) 1895 { 1896 int err; 1897 struct ip_mreqn imr; 1898 __be32 addr = mreqs->imr_multiaddr; 1899 struct ip_mc_socklist *pmc; 1900 struct in_device *in_dev = NULL; 1901 struct inet_sock *inet = inet_sk(sk); 1902 struct ip_sf_socklist *psl; 1903 struct net *net = sock_net(sk); 1904 int leavegroup = 0; 1905 int i, j, rv; 1906 1907 if (!ipv4_is_multicast(addr)) 1908 return -EINVAL; 1909 1910 rtnl_lock(); 1911 1912 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1913 imr.imr_address.s_addr = mreqs->imr_interface; 1914 imr.imr_ifindex = ifindex; 1915 in_dev = ip_mc_find_dev(net, &imr); 1916 1917 if (!in_dev) { 1918 err = -ENODEV; 1919 goto done; 1920 } 1921 err = -EADDRNOTAVAIL; 1922 1923 for_each_pmc_rtnl(inet, pmc) { 1924 if ((pmc->multi.imr_multiaddr.s_addr == 1925 imr.imr_multiaddr.s_addr) && 1926 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1927 break; 1928 } 1929 if (!pmc) { /* must have a prior join */ 1930 err = -EINVAL; 1931 goto done; 1932 } 1933 /* if a source filter was set, must be the same mode as before */ 1934 if (pmc->sflist) { 1935 if (pmc->sfmode != omode) { 1936 err = -EINVAL; 1937 goto done; 1938 } 1939 } else if (pmc->sfmode != omode) { 1940 /* allow mode switches for empty-set filters */ 1941 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1942 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1943 NULL, 0); 1944 pmc->sfmode = omode; 1945 } 1946 1947 psl = rtnl_dereference(pmc->sflist); 1948 if (!add) { 1949 if (!psl) 1950 goto done; /* err = -EADDRNOTAVAIL */ 1951 rv = !0; 1952 for (i=0; i<psl->sl_count; i++) { 1953 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1954 sizeof(__be32)); 1955 if (rv == 0) 1956 break; 1957 } 1958 if (rv) /* source not found */ 1959 goto done; /* err = -EADDRNOTAVAIL */ 1960 1961 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1962 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1963 leavegroup = 1; 1964 goto done; 1965 } 1966 1967 /* update the interface filter */ 1968 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1969 &mreqs->imr_sourceaddr, 1); 1970 1971 for (j=i+1; j<psl->sl_count; j++) 1972 psl->sl_addr[j-1] = psl->sl_addr[j]; 1973 psl->sl_count--; 1974 err = 0; 1975 goto done; 1976 } 1977 /* else, add a new source to the filter */ 1978 1979 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1980 err = -ENOBUFS; 1981 goto done; 1982 } 1983 if (!psl || psl->sl_count == psl->sl_max) { 1984 struct ip_sf_socklist *newpsl; 1985 int count = IP_SFBLOCK; 1986 1987 if (psl) 1988 count += psl->sl_max; 1989 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1990 if (!newpsl) { 1991 err = -ENOBUFS; 1992 goto done; 1993 } 1994 newpsl->sl_max = count; 1995 newpsl->sl_count = count - IP_SFBLOCK; 1996 if (psl) { 1997 for (i=0; i<psl->sl_count; i++) 1998 newpsl->sl_addr[i] = psl->sl_addr[i]; 1999 /* decrease mem now to avoid the memleak warning */ 2000 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2001 kfree_rcu(psl, rcu); 2002 } 2003 rcu_assign_pointer(pmc->sflist, newpsl); 2004 psl = newpsl; 2005 } 2006 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2007 for (i=0; i<psl->sl_count; i++) { 2008 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2009 sizeof(__be32)); 2010 if (rv == 0) 2011 break; 2012 } 2013 if (rv == 0) /* address already there is an error */ 2014 goto done; 2015 for (j=psl->sl_count-1; j>=i; j--) 2016 psl->sl_addr[j+1] = psl->sl_addr[j]; 2017 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2018 psl->sl_count++; 2019 err = 0; 2020 /* update the interface list */ 2021 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2022 &mreqs->imr_sourceaddr, 1); 2023 done: 2024 rtnl_unlock(); 2025 if (leavegroup) 2026 return ip_mc_leave_group(sk, &imr); 2027 return err; 2028 } 2029 2030 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2031 { 2032 int err = 0; 2033 struct ip_mreqn imr; 2034 __be32 addr = msf->imsf_multiaddr; 2035 struct ip_mc_socklist *pmc; 2036 struct in_device *in_dev; 2037 struct inet_sock *inet = inet_sk(sk); 2038 struct ip_sf_socklist *newpsl, *psl; 2039 struct net *net = sock_net(sk); 2040 int leavegroup = 0; 2041 2042 if (!ipv4_is_multicast(addr)) 2043 return -EINVAL; 2044 if (msf->imsf_fmode != MCAST_INCLUDE && 2045 msf->imsf_fmode != MCAST_EXCLUDE) 2046 return -EINVAL; 2047 2048 rtnl_lock(); 2049 2050 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2051 imr.imr_address.s_addr = msf->imsf_interface; 2052 imr.imr_ifindex = ifindex; 2053 in_dev = ip_mc_find_dev(net, &imr); 2054 2055 if (!in_dev) { 2056 err = -ENODEV; 2057 goto done; 2058 } 2059 2060 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2061 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2062 leavegroup = 1; 2063 goto done; 2064 } 2065 2066 for_each_pmc_rtnl(inet, pmc) { 2067 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2068 pmc->multi.imr_ifindex == imr.imr_ifindex) 2069 break; 2070 } 2071 if (!pmc) { /* must have a prior join */ 2072 err = -EINVAL; 2073 goto done; 2074 } 2075 if (msf->imsf_numsrc) { 2076 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2077 GFP_KERNEL); 2078 if (!newpsl) { 2079 err = -ENOBUFS; 2080 goto done; 2081 } 2082 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2083 memcpy(newpsl->sl_addr, msf->imsf_slist, 2084 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2085 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2086 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2087 if (err) { 2088 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2089 goto done; 2090 } 2091 } else { 2092 newpsl = NULL; 2093 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2094 msf->imsf_fmode, 0, NULL, 0); 2095 } 2096 psl = rtnl_dereference(pmc->sflist); 2097 if (psl) { 2098 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2099 psl->sl_count, psl->sl_addr, 0); 2100 /* decrease mem now to avoid the memleak warning */ 2101 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2102 kfree_rcu(psl, rcu); 2103 } else 2104 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2105 0, NULL, 0); 2106 rcu_assign_pointer(pmc->sflist, newpsl); 2107 pmc->sfmode = msf->imsf_fmode; 2108 err = 0; 2109 done: 2110 rtnl_unlock(); 2111 if (leavegroup) 2112 err = ip_mc_leave_group(sk, &imr); 2113 return err; 2114 } 2115 2116 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2117 struct ip_msfilter __user *optval, int __user *optlen) 2118 { 2119 int err, len, count, copycount; 2120 struct ip_mreqn imr; 2121 __be32 addr = msf->imsf_multiaddr; 2122 struct ip_mc_socklist *pmc; 2123 struct in_device *in_dev; 2124 struct inet_sock *inet = inet_sk(sk); 2125 struct ip_sf_socklist *psl; 2126 struct net *net = sock_net(sk); 2127 2128 if (!ipv4_is_multicast(addr)) 2129 return -EINVAL; 2130 2131 rtnl_lock(); 2132 2133 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2134 imr.imr_address.s_addr = msf->imsf_interface; 2135 imr.imr_ifindex = 0; 2136 in_dev = ip_mc_find_dev(net, &imr); 2137 2138 if (!in_dev) { 2139 err = -ENODEV; 2140 goto done; 2141 } 2142 err = -EADDRNOTAVAIL; 2143 2144 for_each_pmc_rtnl(inet, pmc) { 2145 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2146 pmc->multi.imr_ifindex == imr.imr_ifindex) 2147 break; 2148 } 2149 if (!pmc) /* must have a prior join */ 2150 goto done; 2151 msf->imsf_fmode = pmc->sfmode; 2152 psl = rtnl_dereference(pmc->sflist); 2153 rtnl_unlock(); 2154 if (!psl) { 2155 len = 0; 2156 count = 0; 2157 } else { 2158 count = psl->sl_count; 2159 } 2160 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2161 len = copycount * sizeof(psl->sl_addr[0]); 2162 msf->imsf_numsrc = count; 2163 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2164 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2165 return -EFAULT; 2166 } 2167 if (len && 2168 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2169 return -EFAULT; 2170 return 0; 2171 done: 2172 rtnl_unlock(); 2173 return err; 2174 } 2175 2176 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2177 struct group_filter __user *optval, int __user *optlen) 2178 { 2179 int err, i, count, copycount; 2180 struct sockaddr_in *psin; 2181 __be32 addr; 2182 struct ip_mc_socklist *pmc; 2183 struct inet_sock *inet = inet_sk(sk); 2184 struct ip_sf_socklist *psl; 2185 2186 psin = (struct sockaddr_in *)&gsf->gf_group; 2187 if (psin->sin_family != AF_INET) 2188 return -EINVAL; 2189 addr = psin->sin_addr.s_addr; 2190 if (!ipv4_is_multicast(addr)) 2191 return -EINVAL; 2192 2193 rtnl_lock(); 2194 2195 err = -EADDRNOTAVAIL; 2196 2197 for_each_pmc_rtnl(inet, pmc) { 2198 if (pmc->multi.imr_multiaddr.s_addr == addr && 2199 pmc->multi.imr_ifindex == gsf->gf_interface) 2200 break; 2201 } 2202 if (!pmc) /* must have a prior join */ 2203 goto done; 2204 gsf->gf_fmode = pmc->sfmode; 2205 psl = rtnl_dereference(pmc->sflist); 2206 rtnl_unlock(); 2207 count = psl ? psl->sl_count : 0; 2208 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2209 gsf->gf_numsrc = count; 2210 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2211 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2212 return -EFAULT; 2213 } 2214 for (i=0; i<copycount; i++) { 2215 struct sockaddr_storage ss; 2216 2217 psin = (struct sockaddr_in *)&ss; 2218 memset(&ss, 0, sizeof(ss)); 2219 psin->sin_family = AF_INET; 2220 psin->sin_addr.s_addr = psl->sl_addr[i]; 2221 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2222 return -EFAULT; 2223 } 2224 return 0; 2225 done: 2226 rtnl_unlock(); 2227 return err; 2228 } 2229 2230 /* 2231 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2232 */ 2233 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2234 { 2235 struct inet_sock *inet = inet_sk(sk); 2236 struct ip_mc_socklist *pmc; 2237 struct ip_sf_socklist *psl; 2238 int i; 2239 int ret; 2240 2241 ret = 1; 2242 if (!ipv4_is_multicast(loc_addr)) 2243 goto out; 2244 2245 rcu_read_lock(); 2246 for_each_pmc_rcu(inet, pmc) { 2247 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2248 pmc->multi.imr_ifindex == dif) 2249 break; 2250 } 2251 ret = inet->mc_all; 2252 if (!pmc) 2253 goto unlock; 2254 psl = rcu_dereference(pmc->sflist); 2255 ret = (pmc->sfmode == MCAST_EXCLUDE); 2256 if (!psl) 2257 goto unlock; 2258 2259 for (i=0; i<psl->sl_count; i++) { 2260 if (psl->sl_addr[i] == rmt_addr) 2261 break; 2262 } 2263 ret = 0; 2264 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2265 goto unlock; 2266 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2267 goto unlock; 2268 ret = 1; 2269 unlock: 2270 rcu_read_unlock(); 2271 out: 2272 return ret; 2273 } 2274 2275 /* 2276 * A socket is closing. 2277 */ 2278 2279 void ip_mc_drop_socket(struct sock *sk) 2280 { 2281 struct inet_sock *inet = inet_sk(sk); 2282 struct ip_mc_socklist *iml; 2283 struct net *net = sock_net(sk); 2284 2285 if (inet->mc_list == NULL) 2286 return; 2287 2288 rtnl_lock(); 2289 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2290 struct in_device *in_dev; 2291 2292 inet->mc_list = iml->next_rcu; 2293 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2294 (void) ip_mc_leave_src(sk, iml, in_dev); 2295 if (in_dev != NULL) 2296 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2297 /* decrease mem now to avoid the memleak warning */ 2298 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2299 kfree_rcu(iml, rcu); 2300 } 2301 rtnl_unlock(); 2302 } 2303 2304 /* called with rcu_read_lock() */ 2305 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2306 { 2307 struct ip_mc_list *im; 2308 struct ip_sf_list *psf; 2309 int rv = 0; 2310 2311 for_each_pmc_rcu(in_dev, im) { 2312 if (im->multiaddr == mc_addr) 2313 break; 2314 } 2315 if (im && proto == IPPROTO_IGMP) { 2316 rv = 1; 2317 } else if (im) { 2318 if (src_addr) { 2319 for (psf=im->sources; psf; psf=psf->sf_next) { 2320 if (psf->sf_inaddr == src_addr) 2321 break; 2322 } 2323 if (psf) 2324 rv = psf->sf_count[MCAST_INCLUDE] || 2325 psf->sf_count[MCAST_EXCLUDE] != 2326 im->sfcount[MCAST_EXCLUDE]; 2327 else 2328 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2329 } else 2330 rv = 1; /* unspecified source; tentatively allow */ 2331 } 2332 return rv; 2333 } 2334 2335 #if defined(CONFIG_PROC_FS) 2336 struct igmp_mc_iter_state { 2337 struct seq_net_private p; 2338 struct net_device *dev; 2339 struct in_device *in_dev; 2340 }; 2341 2342 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2343 2344 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2345 { 2346 struct net *net = seq_file_net(seq); 2347 struct ip_mc_list *im = NULL; 2348 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2349 2350 state->in_dev = NULL; 2351 for_each_netdev_rcu(net, state->dev) { 2352 struct in_device *in_dev; 2353 2354 in_dev = __in_dev_get_rcu(state->dev); 2355 if (!in_dev) 2356 continue; 2357 im = rcu_dereference(in_dev->mc_list); 2358 if (im) { 2359 state->in_dev = in_dev; 2360 break; 2361 } 2362 } 2363 return im; 2364 } 2365 2366 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2367 { 2368 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2369 2370 im = rcu_dereference(im->next_rcu); 2371 while (!im) { 2372 state->dev = next_net_device_rcu(state->dev); 2373 if (!state->dev) { 2374 state->in_dev = NULL; 2375 break; 2376 } 2377 state->in_dev = __in_dev_get_rcu(state->dev); 2378 if (!state->in_dev) 2379 continue; 2380 im = rcu_dereference(state->in_dev->mc_list); 2381 } 2382 return im; 2383 } 2384 2385 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2386 { 2387 struct ip_mc_list *im = igmp_mc_get_first(seq); 2388 if (im) 2389 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2390 --pos; 2391 return pos ? NULL : im; 2392 } 2393 2394 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2395 __acquires(rcu) 2396 { 2397 rcu_read_lock(); 2398 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2399 } 2400 2401 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2402 { 2403 struct ip_mc_list *im; 2404 if (v == SEQ_START_TOKEN) 2405 im = igmp_mc_get_first(seq); 2406 else 2407 im = igmp_mc_get_next(seq, v); 2408 ++*pos; 2409 return im; 2410 } 2411 2412 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2413 __releases(rcu) 2414 { 2415 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2416 2417 state->in_dev = NULL; 2418 state->dev = NULL; 2419 rcu_read_unlock(); 2420 } 2421 2422 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2423 { 2424 if (v == SEQ_START_TOKEN) 2425 seq_puts(seq, 2426 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2427 else { 2428 struct ip_mc_list *im = (struct ip_mc_list *)v; 2429 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2430 char *querier; 2431 #ifdef CONFIG_IP_MULTICAST 2432 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2433 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2434 "V3"; 2435 #else 2436 querier = "NONE"; 2437 #endif 2438 2439 if (rcu_dereference(state->in_dev->mc_list) == im) { 2440 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2441 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2442 } 2443 2444 seq_printf(seq, 2445 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2446 im->multiaddr, im->users, 2447 im->tm_running, im->tm_running ? 2448 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2449 im->reporter); 2450 } 2451 return 0; 2452 } 2453 2454 static const struct seq_operations igmp_mc_seq_ops = { 2455 .start = igmp_mc_seq_start, 2456 .next = igmp_mc_seq_next, 2457 .stop = igmp_mc_seq_stop, 2458 .show = igmp_mc_seq_show, 2459 }; 2460 2461 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2462 { 2463 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2464 sizeof(struct igmp_mc_iter_state)); 2465 } 2466 2467 static const struct file_operations igmp_mc_seq_fops = { 2468 .owner = THIS_MODULE, 2469 .open = igmp_mc_seq_open, 2470 .read = seq_read, 2471 .llseek = seq_lseek, 2472 .release = seq_release_net, 2473 }; 2474 2475 struct igmp_mcf_iter_state { 2476 struct seq_net_private p; 2477 struct net_device *dev; 2478 struct in_device *idev; 2479 struct ip_mc_list *im; 2480 }; 2481 2482 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2483 2484 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2485 { 2486 struct net *net = seq_file_net(seq); 2487 struct ip_sf_list *psf = NULL; 2488 struct ip_mc_list *im = NULL; 2489 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2490 2491 state->idev = NULL; 2492 state->im = NULL; 2493 for_each_netdev_rcu(net, state->dev) { 2494 struct in_device *idev; 2495 idev = __in_dev_get_rcu(state->dev); 2496 if (unlikely(idev == NULL)) 2497 continue; 2498 im = rcu_dereference(idev->mc_list); 2499 if (likely(im != NULL)) { 2500 spin_lock_bh(&im->lock); 2501 psf = im->sources; 2502 if (likely(psf != NULL)) { 2503 state->im = im; 2504 state->idev = idev; 2505 break; 2506 } 2507 spin_unlock_bh(&im->lock); 2508 } 2509 } 2510 return psf; 2511 } 2512 2513 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2514 { 2515 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2516 2517 psf = psf->sf_next; 2518 while (!psf) { 2519 spin_unlock_bh(&state->im->lock); 2520 state->im = state->im->next; 2521 while (!state->im) { 2522 state->dev = next_net_device_rcu(state->dev); 2523 if (!state->dev) { 2524 state->idev = NULL; 2525 goto out; 2526 } 2527 state->idev = __in_dev_get_rcu(state->dev); 2528 if (!state->idev) 2529 continue; 2530 state->im = rcu_dereference(state->idev->mc_list); 2531 } 2532 if (!state->im) 2533 break; 2534 spin_lock_bh(&state->im->lock); 2535 psf = state->im->sources; 2536 } 2537 out: 2538 return psf; 2539 } 2540 2541 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2542 { 2543 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2544 if (psf) 2545 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2546 --pos; 2547 return pos ? NULL : psf; 2548 } 2549 2550 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2551 __acquires(rcu) 2552 { 2553 rcu_read_lock(); 2554 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2555 } 2556 2557 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2558 { 2559 struct ip_sf_list *psf; 2560 if (v == SEQ_START_TOKEN) 2561 psf = igmp_mcf_get_first(seq); 2562 else 2563 psf = igmp_mcf_get_next(seq, v); 2564 ++*pos; 2565 return psf; 2566 } 2567 2568 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2569 __releases(rcu) 2570 { 2571 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2572 if (likely(state->im != NULL)) { 2573 spin_unlock_bh(&state->im->lock); 2574 state->im = NULL; 2575 } 2576 state->idev = NULL; 2577 state->dev = NULL; 2578 rcu_read_unlock(); 2579 } 2580 2581 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2582 { 2583 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2584 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2585 2586 if (v == SEQ_START_TOKEN) { 2587 seq_printf(seq, 2588 "%3s %6s " 2589 "%10s %10s %6s %6s\n", "Idx", 2590 "Device", "MCA", 2591 "SRC", "INC", "EXC"); 2592 } else { 2593 seq_printf(seq, 2594 "%3d %6.6s 0x%08x " 2595 "0x%08x %6lu %6lu\n", 2596 state->dev->ifindex, state->dev->name, 2597 ntohl(state->im->multiaddr), 2598 ntohl(psf->sf_inaddr), 2599 psf->sf_count[MCAST_INCLUDE], 2600 psf->sf_count[MCAST_EXCLUDE]); 2601 } 2602 return 0; 2603 } 2604 2605 static const struct seq_operations igmp_mcf_seq_ops = { 2606 .start = igmp_mcf_seq_start, 2607 .next = igmp_mcf_seq_next, 2608 .stop = igmp_mcf_seq_stop, 2609 .show = igmp_mcf_seq_show, 2610 }; 2611 2612 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2613 { 2614 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2615 sizeof(struct igmp_mcf_iter_state)); 2616 } 2617 2618 static const struct file_operations igmp_mcf_seq_fops = { 2619 .owner = THIS_MODULE, 2620 .open = igmp_mcf_seq_open, 2621 .read = seq_read, 2622 .llseek = seq_lseek, 2623 .release = seq_release_net, 2624 }; 2625 2626 static int __net_init igmp_net_init(struct net *net) 2627 { 2628 struct proc_dir_entry *pde; 2629 2630 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2631 if (!pde) 2632 goto out_igmp; 2633 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2634 if (!pde) 2635 goto out_mcfilter; 2636 return 0; 2637 2638 out_mcfilter: 2639 proc_net_remove(net, "igmp"); 2640 out_igmp: 2641 return -ENOMEM; 2642 } 2643 2644 static void __net_exit igmp_net_exit(struct net *net) 2645 { 2646 proc_net_remove(net, "mcfilter"); 2647 proc_net_remove(net, "igmp"); 2648 } 2649 2650 static struct pernet_operations igmp_net_ops = { 2651 .init = igmp_net_init, 2652 .exit = igmp_net_exit, 2653 }; 2654 2655 int __init igmp_mc_proc_init(void) 2656 { 2657 return register_pernet_subsys(&igmp_net_ops); 2658 } 2659 #endif 2660