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 int hlen = LL_RESERVED_SPACE(dev); 308 int tlen = dev->needed_tailroom; 309 310 while (1) { 311 skb = alloc_skb(size + hlen + tlen, 312 GFP_ATOMIC | __GFP_NOWARN); 313 if (skb) 314 break; 315 size >>= 1; 316 if (size < 256) 317 return NULL; 318 } 319 igmp_skb_size(skb) = size; 320 321 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 322 0, 0, 323 IPPROTO_IGMP, 0, dev->ifindex); 324 if (IS_ERR(rt)) { 325 kfree_skb(skb); 326 return NULL; 327 } 328 329 skb_dst_set(skb, &rt->dst); 330 skb->dev = dev; 331 332 skb_reserve(skb, hlen); 333 334 skb_reset_network_header(skb); 335 pip = ip_hdr(skb); 336 skb_put(skb, sizeof(struct iphdr) + 4); 337 338 pip->version = 4; 339 pip->ihl = (sizeof(struct iphdr)+4)>>2; 340 pip->tos = 0xc0; 341 pip->frag_off = htons(IP_DF); 342 pip->ttl = 1; 343 pip->daddr = fl4.daddr; 344 pip->saddr = fl4.saddr; 345 pip->protocol = IPPROTO_IGMP; 346 pip->tot_len = 0; /* filled in later */ 347 ip_select_ident(pip, &rt->dst, NULL); 348 ((u8*)&pip[1])[0] = IPOPT_RA; 349 ((u8*)&pip[1])[1] = 4; 350 ((u8*)&pip[1])[2] = 0; 351 ((u8*)&pip[1])[3] = 0; 352 353 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 354 skb_put(skb, sizeof(*pig)); 355 pig = igmpv3_report_hdr(skb); 356 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 357 pig->resv1 = 0; 358 pig->csum = 0; 359 pig->resv2 = 0; 360 pig->ngrec = 0; 361 return skb; 362 } 363 364 static int igmpv3_sendpack(struct sk_buff *skb) 365 { 366 struct igmphdr *pig = igmp_hdr(skb); 367 const int igmplen = skb->tail - skb->transport_header; 368 369 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 370 371 return ip_local_out(skb); 372 } 373 374 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 375 { 376 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 377 } 378 379 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 380 int type, struct igmpv3_grec **ppgr) 381 { 382 struct net_device *dev = pmc->interface->dev; 383 struct igmpv3_report *pih; 384 struct igmpv3_grec *pgr; 385 386 if (!skb) 387 skb = igmpv3_newpack(dev, dev->mtu); 388 if (!skb) 389 return NULL; 390 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 391 pgr->grec_type = type; 392 pgr->grec_auxwords = 0; 393 pgr->grec_nsrcs = 0; 394 pgr->grec_mca = pmc->multiaddr; 395 pih = igmpv3_report_hdr(skb); 396 pih->ngrec = htons(ntohs(pih->ngrec)+1); 397 *ppgr = pgr; 398 return skb; 399 } 400 401 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ 402 skb_tailroom(skb)) : 0) 403 404 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 405 int type, int gdeleted, int sdeleted) 406 { 407 struct net_device *dev = pmc->interface->dev; 408 struct igmpv3_report *pih; 409 struct igmpv3_grec *pgr = NULL; 410 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 411 int scount, stotal, first, isquery, truncate; 412 413 if (pmc->multiaddr == IGMP_ALL_HOSTS) 414 return skb; 415 416 isquery = type == IGMPV3_MODE_IS_INCLUDE || 417 type == IGMPV3_MODE_IS_EXCLUDE; 418 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 419 type == IGMPV3_CHANGE_TO_EXCLUDE; 420 421 stotal = scount = 0; 422 423 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 424 425 if (!*psf_list) 426 goto empty_source; 427 428 pih = skb ? igmpv3_report_hdr(skb) : NULL; 429 430 /* EX and TO_EX get a fresh packet, if needed */ 431 if (truncate) { 432 if (pih && pih->ngrec && 433 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 434 if (skb) 435 igmpv3_sendpack(skb); 436 skb = igmpv3_newpack(dev, dev->mtu); 437 } 438 } 439 first = 1; 440 psf_prev = NULL; 441 for (psf=*psf_list; psf; psf=psf_next) { 442 __be32 *psrc; 443 444 psf_next = psf->sf_next; 445 446 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 447 psf_prev = psf; 448 continue; 449 } 450 451 /* clear marks on query responses */ 452 if (isquery) 453 psf->sf_gsresp = 0; 454 455 if (AVAILABLE(skb) < sizeof(__be32) + 456 first*sizeof(struct igmpv3_grec)) { 457 if (truncate && !first) 458 break; /* truncate these */ 459 if (pgr) 460 pgr->grec_nsrcs = htons(scount); 461 if (skb) 462 igmpv3_sendpack(skb); 463 skb = igmpv3_newpack(dev, dev->mtu); 464 first = 1; 465 scount = 0; 466 } 467 if (first) { 468 skb = add_grhead(skb, pmc, type, &pgr); 469 first = 0; 470 } 471 if (!skb) 472 return NULL; 473 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 474 *psrc = psf->sf_inaddr; 475 scount++; stotal++; 476 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 477 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 478 psf->sf_crcount--; 479 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 480 if (psf_prev) 481 psf_prev->sf_next = psf->sf_next; 482 else 483 *psf_list = psf->sf_next; 484 kfree(psf); 485 continue; 486 } 487 } 488 psf_prev = psf; 489 } 490 491 empty_source: 492 if (!stotal) { 493 if (type == IGMPV3_ALLOW_NEW_SOURCES || 494 type == IGMPV3_BLOCK_OLD_SOURCES) 495 return skb; 496 if (pmc->crcount || isquery) { 497 /* make sure we have room for group header */ 498 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 499 igmpv3_sendpack(skb); 500 skb = NULL; /* add_grhead will get a new one */ 501 } 502 skb = add_grhead(skb, pmc, type, &pgr); 503 } 504 } 505 if (pgr) 506 pgr->grec_nsrcs = htons(scount); 507 508 if (isquery) 509 pmc->gsquery = 0; /* clear query state on report */ 510 return skb; 511 } 512 513 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 514 { 515 struct sk_buff *skb = NULL; 516 int type; 517 518 if (!pmc) { 519 rcu_read_lock(); 520 for_each_pmc_rcu(in_dev, pmc) { 521 if (pmc->multiaddr == IGMP_ALL_HOSTS) 522 continue; 523 spin_lock_bh(&pmc->lock); 524 if (pmc->sfcount[MCAST_EXCLUDE]) 525 type = IGMPV3_MODE_IS_EXCLUDE; 526 else 527 type = IGMPV3_MODE_IS_INCLUDE; 528 skb = add_grec(skb, pmc, type, 0, 0); 529 spin_unlock_bh(&pmc->lock); 530 } 531 rcu_read_unlock(); 532 } else { 533 spin_lock_bh(&pmc->lock); 534 if (pmc->sfcount[MCAST_EXCLUDE]) 535 type = IGMPV3_MODE_IS_EXCLUDE; 536 else 537 type = IGMPV3_MODE_IS_INCLUDE; 538 skb = add_grec(skb, pmc, type, 0, 0); 539 spin_unlock_bh(&pmc->lock); 540 } 541 if (!skb) 542 return 0; 543 return igmpv3_sendpack(skb); 544 } 545 546 /* 547 * remove zero-count source records from a source filter list 548 */ 549 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 550 { 551 struct ip_sf_list *psf_prev, *psf_next, *psf; 552 553 psf_prev = NULL; 554 for (psf=*ppsf; psf; psf = psf_next) { 555 psf_next = psf->sf_next; 556 if (psf->sf_crcount == 0) { 557 if (psf_prev) 558 psf_prev->sf_next = psf->sf_next; 559 else 560 *ppsf = psf->sf_next; 561 kfree(psf); 562 } else 563 psf_prev = psf; 564 } 565 } 566 567 static void igmpv3_send_cr(struct in_device *in_dev) 568 { 569 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 570 struct sk_buff *skb = NULL; 571 int type, dtype; 572 573 rcu_read_lock(); 574 spin_lock_bh(&in_dev->mc_tomb_lock); 575 576 /* deleted MCA's */ 577 pmc_prev = NULL; 578 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 579 pmc_next = pmc->next; 580 if (pmc->sfmode == MCAST_INCLUDE) { 581 type = IGMPV3_BLOCK_OLD_SOURCES; 582 dtype = IGMPV3_BLOCK_OLD_SOURCES; 583 skb = add_grec(skb, pmc, type, 1, 0); 584 skb = add_grec(skb, pmc, dtype, 1, 1); 585 } 586 if (pmc->crcount) { 587 if (pmc->sfmode == MCAST_EXCLUDE) { 588 type = IGMPV3_CHANGE_TO_INCLUDE; 589 skb = add_grec(skb, pmc, type, 1, 0); 590 } 591 pmc->crcount--; 592 if (pmc->crcount == 0) { 593 igmpv3_clear_zeros(&pmc->tomb); 594 igmpv3_clear_zeros(&pmc->sources); 595 } 596 } 597 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 598 if (pmc_prev) 599 pmc_prev->next = pmc_next; 600 else 601 in_dev->mc_tomb = pmc_next; 602 in_dev_put(pmc->interface); 603 kfree(pmc); 604 } else 605 pmc_prev = pmc; 606 } 607 spin_unlock_bh(&in_dev->mc_tomb_lock); 608 609 /* change recs */ 610 for_each_pmc_rcu(in_dev, pmc) { 611 spin_lock_bh(&pmc->lock); 612 if (pmc->sfcount[MCAST_EXCLUDE]) { 613 type = IGMPV3_BLOCK_OLD_SOURCES; 614 dtype = IGMPV3_ALLOW_NEW_SOURCES; 615 } else { 616 type = IGMPV3_ALLOW_NEW_SOURCES; 617 dtype = IGMPV3_BLOCK_OLD_SOURCES; 618 } 619 skb = add_grec(skb, pmc, type, 0, 0); 620 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 621 622 /* filter mode changes */ 623 if (pmc->crcount) { 624 if (pmc->sfmode == MCAST_EXCLUDE) 625 type = IGMPV3_CHANGE_TO_EXCLUDE; 626 else 627 type = IGMPV3_CHANGE_TO_INCLUDE; 628 skb = add_grec(skb, pmc, type, 0, 0); 629 pmc->crcount--; 630 } 631 spin_unlock_bh(&pmc->lock); 632 } 633 rcu_read_unlock(); 634 635 if (!skb) 636 return; 637 (void) igmpv3_sendpack(skb); 638 } 639 640 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 641 int type) 642 { 643 struct sk_buff *skb; 644 struct iphdr *iph; 645 struct igmphdr *ih; 646 struct rtable *rt; 647 struct net_device *dev = in_dev->dev; 648 struct net *net = dev_net(dev); 649 __be32 group = pmc ? pmc->multiaddr : 0; 650 struct flowi4 fl4; 651 __be32 dst; 652 int hlen, tlen; 653 654 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 655 return igmpv3_send_report(in_dev, pmc); 656 else if (type == IGMP_HOST_LEAVE_MESSAGE) 657 dst = IGMP_ALL_ROUTER; 658 else 659 dst = group; 660 661 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 662 0, 0, 663 IPPROTO_IGMP, 0, dev->ifindex); 664 if (IS_ERR(rt)) 665 return -1; 666 667 hlen = LL_RESERVED_SPACE(dev); 668 tlen = dev->needed_tailroom; 669 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 670 if (skb == NULL) { 671 ip_rt_put(rt); 672 return -1; 673 } 674 675 skb_dst_set(skb, &rt->dst); 676 677 skb_reserve(skb, hlen); 678 679 skb_reset_network_header(skb); 680 iph = ip_hdr(skb); 681 skb_put(skb, sizeof(struct iphdr) + 4); 682 683 iph->version = 4; 684 iph->ihl = (sizeof(struct iphdr)+4)>>2; 685 iph->tos = 0xc0; 686 iph->frag_off = htons(IP_DF); 687 iph->ttl = 1; 688 iph->daddr = dst; 689 iph->saddr = fl4.saddr; 690 iph->protocol = IPPROTO_IGMP; 691 ip_select_ident(iph, &rt->dst, NULL); 692 ((u8*)&iph[1])[0] = IPOPT_RA; 693 ((u8*)&iph[1])[1] = 4; 694 ((u8*)&iph[1])[2] = 0; 695 ((u8*)&iph[1])[3] = 0; 696 697 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 698 ih->type = type; 699 ih->code = 0; 700 ih->csum = 0; 701 ih->group = group; 702 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 703 704 return ip_local_out(skb); 705 } 706 707 static void igmp_gq_timer_expire(unsigned long data) 708 { 709 struct in_device *in_dev = (struct in_device *)data; 710 711 in_dev->mr_gq_running = 0; 712 igmpv3_send_report(in_dev, NULL); 713 __in_dev_put(in_dev); 714 } 715 716 static void igmp_ifc_timer_expire(unsigned long data) 717 { 718 struct in_device *in_dev = (struct in_device *)data; 719 720 igmpv3_send_cr(in_dev); 721 if (in_dev->mr_ifc_count) { 722 in_dev->mr_ifc_count--; 723 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 724 } 725 __in_dev_put(in_dev); 726 } 727 728 static void igmp_ifc_event(struct in_device *in_dev) 729 { 730 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 731 return; 732 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 733 IGMP_Unsolicited_Report_Count; 734 igmp_ifc_start_timer(in_dev, 1); 735 } 736 737 738 static void igmp_timer_expire(unsigned long data) 739 { 740 struct ip_mc_list *im=(struct ip_mc_list *)data; 741 struct in_device *in_dev = im->interface; 742 743 spin_lock(&im->lock); 744 im->tm_running = 0; 745 746 if (im->unsolicit_count) { 747 im->unsolicit_count--; 748 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 749 } 750 im->reporter = 1; 751 spin_unlock(&im->lock); 752 753 if (IGMP_V1_SEEN(in_dev)) 754 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 755 else if (IGMP_V2_SEEN(in_dev)) 756 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 757 else 758 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 759 760 ip_ma_put(im); 761 } 762 763 /* mark EXCLUDE-mode sources */ 764 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 765 { 766 struct ip_sf_list *psf; 767 int i, scount; 768 769 scount = 0; 770 for (psf=pmc->sources; psf; psf=psf->sf_next) { 771 if (scount == nsrcs) 772 break; 773 for (i=0; i<nsrcs; i++) { 774 /* skip inactive filters */ 775 if (psf->sf_count[MCAST_INCLUDE] || 776 pmc->sfcount[MCAST_EXCLUDE] != 777 psf->sf_count[MCAST_EXCLUDE]) 778 continue; 779 if (srcs[i] == psf->sf_inaddr) { 780 scount++; 781 break; 782 } 783 } 784 } 785 pmc->gsquery = 0; 786 if (scount == nsrcs) /* all sources excluded */ 787 return 0; 788 return 1; 789 } 790 791 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 792 { 793 struct ip_sf_list *psf; 794 int i, scount; 795 796 if (pmc->sfmode == MCAST_EXCLUDE) 797 return igmp_xmarksources(pmc, nsrcs, srcs); 798 799 /* mark INCLUDE-mode sources */ 800 scount = 0; 801 for (psf=pmc->sources; psf; psf=psf->sf_next) { 802 if (scount == nsrcs) 803 break; 804 for (i=0; i<nsrcs; i++) 805 if (srcs[i] == psf->sf_inaddr) { 806 psf->sf_gsresp = 1; 807 scount++; 808 break; 809 } 810 } 811 if (!scount) { 812 pmc->gsquery = 0; 813 return 0; 814 } 815 pmc->gsquery = 1; 816 return 1; 817 } 818 819 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 820 { 821 struct ip_mc_list *im; 822 823 /* Timers are only set for non-local groups */ 824 825 if (group == IGMP_ALL_HOSTS) 826 return; 827 828 rcu_read_lock(); 829 for_each_pmc_rcu(in_dev, im) { 830 if (im->multiaddr == group) { 831 igmp_stop_timer(im); 832 break; 833 } 834 } 835 rcu_read_unlock(); 836 } 837 838 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 839 int len) 840 { 841 struct igmphdr *ih = igmp_hdr(skb); 842 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 843 struct ip_mc_list *im; 844 __be32 group = ih->group; 845 int max_delay; 846 int mark = 0; 847 848 849 if (len == 8) { 850 if (ih->code == 0) { 851 /* Alas, old v1 router presents here. */ 852 853 max_delay = IGMP_Query_Response_Interval; 854 in_dev->mr_v1_seen = jiffies + 855 IGMP_V1_Router_Present_Timeout; 856 group = 0; 857 } else { 858 /* v2 router present */ 859 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 860 in_dev->mr_v2_seen = jiffies + 861 IGMP_V2_Router_Present_Timeout; 862 } 863 /* cancel the interface change timer */ 864 in_dev->mr_ifc_count = 0; 865 if (del_timer(&in_dev->mr_ifc_timer)) 866 __in_dev_put(in_dev); 867 /* clear deleted report items */ 868 igmpv3_clear_delrec(in_dev); 869 } else if (len < 12) { 870 return; /* ignore bogus packet; freed by caller */ 871 } else if (IGMP_V1_SEEN(in_dev)) { 872 /* This is a v3 query with v1 queriers present */ 873 max_delay = IGMP_Query_Response_Interval; 874 group = 0; 875 } else if (IGMP_V2_SEEN(in_dev)) { 876 /* this is a v3 query with v2 queriers present; 877 * Interpretation of the max_delay code is problematic here. 878 * A real v2 host would use ih_code directly, while v3 has a 879 * different encoding. We use the v3 encoding as more likely 880 * to be intended in a v3 query. 881 */ 882 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 883 if (!max_delay) 884 max_delay = 1; /* can't mod w/ 0 */ 885 } else { /* v3 */ 886 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 887 return; 888 889 ih3 = igmpv3_query_hdr(skb); 890 if (ih3->nsrcs) { 891 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 892 + ntohs(ih3->nsrcs)*sizeof(__be32))) 893 return; 894 ih3 = igmpv3_query_hdr(skb); 895 } 896 897 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 898 if (!max_delay) 899 max_delay = 1; /* can't mod w/ 0 */ 900 in_dev->mr_maxdelay = max_delay; 901 if (ih3->qrv) 902 in_dev->mr_qrv = ih3->qrv; 903 if (!group) { /* general query */ 904 if (ih3->nsrcs) 905 return; /* no sources allowed */ 906 igmp_gq_start_timer(in_dev); 907 return; 908 } 909 /* mark sources to include, if group & source-specific */ 910 mark = ih3->nsrcs != 0; 911 } 912 913 /* 914 * - Start the timers in all of our membership records 915 * that the query applies to for the interface on 916 * which the query arrived excl. those that belong 917 * to a "local" group (224.0.0.X) 918 * - For timers already running check if they need to 919 * be reset. 920 * - Use the igmp->igmp_code field as the maximum 921 * delay possible 922 */ 923 rcu_read_lock(); 924 for_each_pmc_rcu(in_dev, im) { 925 int changed; 926 927 if (group && group != im->multiaddr) 928 continue; 929 if (im->multiaddr == IGMP_ALL_HOSTS) 930 continue; 931 spin_lock_bh(&im->lock); 932 if (im->tm_running) 933 im->gsquery = im->gsquery && mark; 934 else 935 im->gsquery = mark; 936 changed = !im->gsquery || 937 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 938 spin_unlock_bh(&im->lock); 939 if (changed) 940 igmp_mod_timer(im, max_delay); 941 } 942 rcu_read_unlock(); 943 } 944 945 /* called in rcu_read_lock() section */ 946 int igmp_rcv(struct sk_buff *skb) 947 { 948 /* This basically follows the spec line by line -- see RFC1112 */ 949 struct igmphdr *ih; 950 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 951 int len = skb->len; 952 953 if (in_dev == NULL) 954 goto drop; 955 956 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 957 goto drop; 958 959 switch (skb->ip_summed) { 960 case CHECKSUM_COMPLETE: 961 if (!csum_fold(skb->csum)) 962 break; 963 /* fall through */ 964 case CHECKSUM_NONE: 965 skb->csum = 0; 966 if (__skb_checksum_complete(skb)) 967 goto drop; 968 } 969 970 ih = igmp_hdr(skb); 971 switch (ih->type) { 972 case IGMP_HOST_MEMBERSHIP_QUERY: 973 igmp_heard_query(in_dev, skb, len); 974 break; 975 case IGMP_HOST_MEMBERSHIP_REPORT: 976 case IGMPV2_HOST_MEMBERSHIP_REPORT: 977 /* Is it our report looped back? */ 978 if (rt_is_output_route(skb_rtable(skb))) 979 break; 980 /* don't rely on MC router hearing unicast reports */ 981 if (skb->pkt_type == PACKET_MULTICAST || 982 skb->pkt_type == PACKET_BROADCAST) 983 igmp_heard_report(in_dev, ih->group); 984 break; 985 case IGMP_PIM: 986 #ifdef CONFIG_IP_PIMSM_V1 987 return pim_rcv_v1(skb); 988 #endif 989 case IGMPV3_HOST_MEMBERSHIP_REPORT: 990 case IGMP_DVMRP: 991 case IGMP_TRACE: 992 case IGMP_HOST_LEAVE_MESSAGE: 993 case IGMP_MTRACE: 994 case IGMP_MTRACE_RESP: 995 break; 996 default: 997 break; 998 } 999 1000 drop: 1001 kfree_skb(skb); 1002 return 0; 1003 } 1004 1005 #endif 1006 1007 1008 /* 1009 * Add a filter to a device 1010 */ 1011 1012 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1013 { 1014 char buf[MAX_ADDR_LEN]; 1015 struct net_device *dev = in_dev->dev; 1016 1017 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1018 We will get multicast token leakage, when IFF_MULTICAST 1019 is changed. This check should be done in ndo_set_rx_mode 1020 routine. Something sort of: 1021 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1022 --ANK 1023 */ 1024 if (arp_mc_map(addr, buf, dev, 0) == 0) 1025 dev_mc_add(dev, buf); 1026 } 1027 1028 /* 1029 * Remove a filter from a device 1030 */ 1031 1032 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1033 { 1034 char buf[MAX_ADDR_LEN]; 1035 struct net_device *dev = in_dev->dev; 1036 1037 if (arp_mc_map(addr, buf, dev, 0) == 0) 1038 dev_mc_del(dev, buf); 1039 } 1040 1041 #ifdef CONFIG_IP_MULTICAST 1042 /* 1043 * deleted ip_mc_list manipulation 1044 */ 1045 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1046 { 1047 struct ip_mc_list *pmc; 1048 1049 /* this is an "ip_mc_list" for convenience; only the fields below 1050 * are actually used. In particular, the refcnt and users are not 1051 * used for management of the delete list. Using the same structure 1052 * for deleted items allows change reports to use common code with 1053 * non-deleted or query-response MCA's. 1054 */ 1055 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1056 if (!pmc) 1057 return; 1058 spin_lock_bh(&im->lock); 1059 pmc->interface = im->interface; 1060 in_dev_hold(in_dev); 1061 pmc->multiaddr = im->multiaddr; 1062 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1063 IGMP_Unsolicited_Report_Count; 1064 pmc->sfmode = im->sfmode; 1065 if (pmc->sfmode == MCAST_INCLUDE) { 1066 struct ip_sf_list *psf; 1067 1068 pmc->tomb = im->tomb; 1069 pmc->sources = im->sources; 1070 im->tomb = im->sources = NULL; 1071 for (psf=pmc->sources; psf; psf=psf->sf_next) 1072 psf->sf_crcount = pmc->crcount; 1073 } 1074 spin_unlock_bh(&im->lock); 1075 1076 spin_lock_bh(&in_dev->mc_tomb_lock); 1077 pmc->next = in_dev->mc_tomb; 1078 in_dev->mc_tomb = pmc; 1079 spin_unlock_bh(&in_dev->mc_tomb_lock); 1080 } 1081 1082 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1083 { 1084 struct ip_mc_list *pmc, *pmc_prev; 1085 struct ip_sf_list *psf, *psf_next; 1086 1087 spin_lock_bh(&in_dev->mc_tomb_lock); 1088 pmc_prev = NULL; 1089 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1090 if (pmc->multiaddr == multiaddr) 1091 break; 1092 pmc_prev = pmc; 1093 } 1094 if (pmc) { 1095 if (pmc_prev) 1096 pmc_prev->next = pmc->next; 1097 else 1098 in_dev->mc_tomb = pmc->next; 1099 } 1100 spin_unlock_bh(&in_dev->mc_tomb_lock); 1101 if (pmc) { 1102 for (psf=pmc->tomb; psf; psf=psf_next) { 1103 psf_next = psf->sf_next; 1104 kfree(psf); 1105 } 1106 in_dev_put(pmc->interface); 1107 kfree(pmc); 1108 } 1109 } 1110 1111 static void igmpv3_clear_delrec(struct in_device *in_dev) 1112 { 1113 struct ip_mc_list *pmc, *nextpmc; 1114 1115 spin_lock_bh(&in_dev->mc_tomb_lock); 1116 pmc = in_dev->mc_tomb; 1117 in_dev->mc_tomb = NULL; 1118 spin_unlock_bh(&in_dev->mc_tomb_lock); 1119 1120 for (; pmc; pmc = nextpmc) { 1121 nextpmc = pmc->next; 1122 ip_mc_clear_src(pmc); 1123 in_dev_put(pmc->interface); 1124 kfree(pmc); 1125 } 1126 /* clear dead sources, too */ 1127 rcu_read_lock(); 1128 for_each_pmc_rcu(in_dev, pmc) { 1129 struct ip_sf_list *psf, *psf_next; 1130 1131 spin_lock_bh(&pmc->lock); 1132 psf = pmc->tomb; 1133 pmc->tomb = NULL; 1134 spin_unlock_bh(&pmc->lock); 1135 for (; psf; psf=psf_next) { 1136 psf_next = psf->sf_next; 1137 kfree(psf); 1138 } 1139 } 1140 rcu_read_unlock(); 1141 } 1142 #endif 1143 1144 static void igmp_group_dropped(struct ip_mc_list *im) 1145 { 1146 struct in_device *in_dev = im->interface; 1147 #ifdef CONFIG_IP_MULTICAST 1148 int reporter; 1149 #endif 1150 1151 if (im->loaded) { 1152 im->loaded = 0; 1153 ip_mc_filter_del(in_dev, im->multiaddr); 1154 } 1155 1156 #ifdef CONFIG_IP_MULTICAST 1157 if (im->multiaddr == IGMP_ALL_HOSTS) 1158 return; 1159 1160 reporter = im->reporter; 1161 igmp_stop_timer(im); 1162 1163 if (!in_dev->dead) { 1164 if (IGMP_V1_SEEN(in_dev)) 1165 return; 1166 if (IGMP_V2_SEEN(in_dev)) { 1167 if (reporter) 1168 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1169 return; 1170 } 1171 /* IGMPv3 */ 1172 igmpv3_add_delrec(in_dev, im); 1173 1174 igmp_ifc_event(in_dev); 1175 } 1176 #endif 1177 } 1178 1179 static void igmp_group_added(struct ip_mc_list *im) 1180 { 1181 struct in_device *in_dev = im->interface; 1182 1183 if (im->loaded == 0) { 1184 im->loaded = 1; 1185 ip_mc_filter_add(in_dev, im->multiaddr); 1186 } 1187 1188 #ifdef CONFIG_IP_MULTICAST 1189 if (im->multiaddr == IGMP_ALL_HOSTS) 1190 return; 1191 1192 if (in_dev->dead) 1193 return; 1194 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1195 spin_lock_bh(&im->lock); 1196 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1197 spin_unlock_bh(&im->lock); 1198 return; 1199 } 1200 /* else, v3 */ 1201 1202 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1203 IGMP_Unsolicited_Report_Count; 1204 igmp_ifc_event(in_dev); 1205 #endif 1206 } 1207 1208 1209 /* 1210 * Multicast list managers 1211 */ 1212 1213 1214 /* 1215 * A socket has joined a multicast group on device dev. 1216 */ 1217 1218 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1219 { 1220 struct ip_mc_list *im; 1221 1222 ASSERT_RTNL(); 1223 1224 for_each_pmc_rtnl(in_dev, im) { 1225 if (im->multiaddr == addr) { 1226 im->users++; 1227 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1228 goto out; 1229 } 1230 } 1231 1232 im = kzalloc(sizeof(*im), GFP_KERNEL); 1233 if (!im) 1234 goto out; 1235 1236 im->users = 1; 1237 im->interface = in_dev; 1238 in_dev_hold(in_dev); 1239 im->multiaddr = addr; 1240 /* initial mode is (EX, empty) */ 1241 im->sfmode = MCAST_EXCLUDE; 1242 im->sfcount[MCAST_EXCLUDE] = 1; 1243 atomic_set(&im->refcnt, 1); 1244 spin_lock_init(&im->lock); 1245 #ifdef CONFIG_IP_MULTICAST 1246 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1247 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1248 #endif 1249 1250 im->next_rcu = in_dev->mc_list; 1251 in_dev->mc_count++; 1252 rcu_assign_pointer(in_dev->mc_list, im); 1253 1254 #ifdef CONFIG_IP_MULTICAST 1255 igmpv3_del_delrec(in_dev, im->multiaddr); 1256 #endif 1257 igmp_group_added(im); 1258 if (!in_dev->dead) 1259 ip_rt_multicast_event(in_dev); 1260 out: 1261 return; 1262 } 1263 EXPORT_SYMBOL(ip_mc_inc_group); 1264 1265 /* 1266 * Resend IGMP JOIN report; used for bonding. 1267 * Called with rcu_read_lock() 1268 */ 1269 void ip_mc_rejoin_groups(struct in_device *in_dev) 1270 { 1271 #ifdef CONFIG_IP_MULTICAST 1272 struct ip_mc_list *im; 1273 int type; 1274 1275 for_each_pmc_rcu(in_dev, im) { 1276 if (im->multiaddr == IGMP_ALL_HOSTS) 1277 continue; 1278 1279 /* a failover is happening and switches 1280 * must be notified immediately 1281 */ 1282 if (IGMP_V1_SEEN(in_dev)) 1283 type = IGMP_HOST_MEMBERSHIP_REPORT; 1284 else if (IGMP_V2_SEEN(in_dev)) 1285 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1286 else 1287 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1288 igmp_send_report(in_dev, im, type); 1289 } 1290 #endif 1291 } 1292 EXPORT_SYMBOL(ip_mc_rejoin_groups); 1293 1294 /* 1295 * A socket has left a multicast group on device dev 1296 */ 1297 1298 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1299 { 1300 struct ip_mc_list *i; 1301 struct ip_mc_list __rcu **ip; 1302 1303 ASSERT_RTNL(); 1304 1305 for (ip = &in_dev->mc_list; 1306 (i = rtnl_dereference(*ip)) != NULL; 1307 ip = &i->next_rcu) { 1308 if (i->multiaddr == addr) { 1309 if (--i->users == 0) { 1310 *ip = i->next_rcu; 1311 in_dev->mc_count--; 1312 igmp_group_dropped(i); 1313 ip_mc_clear_src(i); 1314 1315 if (!in_dev->dead) 1316 ip_rt_multicast_event(in_dev); 1317 1318 ip_ma_put(i); 1319 return; 1320 } 1321 break; 1322 } 1323 } 1324 } 1325 EXPORT_SYMBOL(ip_mc_dec_group); 1326 1327 /* Device changing type */ 1328 1329 void ip_mc_unmap(struct in_device *in_dev) 1330 { 1331 struct ip_mc_list *pmc; 1332 1333 ASSERT_RTNL(); 1334 1335 for_each_pmc_rtnl(in_dev, pmc) 1336 igmp_group_dropped(pmc); 1337 } 1338 1339 void ip_mc_remap(struct in_device *in_dev) 1340 { 1341 struct ip_mc_list *pmc; 1342 1343 ASSERT_RTNL(); 1344 1345 for_each_pmc_rtnl(in_dev, pmc) 1346 igmp_group_added(pmc); 1347 } 1348 1349 /* Device going down */ 1350 1351 void ip_mc_down(struct in_device *in_dev) 1352 { 1353 struct ip_mc_list *pmc; 1354 1355 ASSERT_RTNL(); 1356 1357 for_each_pmc_rtnl(in_dev, pmc) 1358 igmp_group_dropped(pmc); 1359 1360 #ifdef CONFIG_IP_MULTICAST 1361 in_dev->mr_ifc_count = 0; 1362 if (del_timer(&in_dev->mr_ifc_timer)) 1363 __in_dev_put(in_dev); 1364 in_dev->mr_gq_running = 0; 1365 if (del_timer(&in_dev->mr_gq_timer)) 1366 __in_dev_put(in_dev); 1367 igmpv3_clear_delrec(in_dev); 1368 #endif 1369 1370 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1371 } 1372 1373 void ip_mc_init_dev(struct in_device *in_dev) 1374 { 1375 ASSERT_RTNL(); 1376 1377 in_dev->mc_tomb = NULL; 1378 #ifdef CONFIG_IP_MULTICAST 1379 in_dev->mr_gq_running = 0; 1380 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1381 (unsigned long)in_dev); 1382 in_dev->mr_ifc_count = 0; 1383 in_dev->mc_count = 0; 1384 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1385 (unsigned long)in_dev); 1386 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1387 #endif 1388 1389 spin_lock_init(&in_dev->mc_tomb_lock); 1390 } 1391 1392 /* Device going up */ 1393 1394 void ip_mc_up(struct in_device *in_dev) 1395 { 1396 struct ip_mc_list *pmc; 1397 1398 ASSERT_RTNL(); 1399 1400 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1401 1402 for_each_pmc_rtnl(in_dev, pmc) 1403 igmp_group_added(pmc); 1404 } 1405 1406 /* 1407 * Device is about to be destroyed: clean up. 1408 */ 1409 1410 void ip_mc_destroy_dev(struct in_device *in_dev) 1411 { 1412 struct ip_mc_list *i; 1413 1414 ASSERT_RTNL(); 1415 1416 /* Deactivate timers */ 1417 ip_mc_down(in_dev); 1418 1419 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1420 in_dev->mc_list = i->next_rcu; 1421 in_dev->mc_count--; 1422 1423 /* We've dropped the groups in ip_mc_down already */ 1424 ip_mc_clear_src(i); 1425 ip_ma_put(i); 1426 } 1427 } 1428 1429 /* RTNL is locked */ 1430 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1431 { 1432 struct net_device *dev = NULL; 1433 struct in_device *idev = NULL; 1434 1435 if (imr->imr_ifindex) { 1436 idev = inetdev_by_index(net, imr->imr_ifindex); 1437 return idev; 1438 } 1439 if (imr->imr_address.s_addr) { 1440 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1441 if (!dev) 1442 return NULL; 1443 } 1444 1445 if (!dev) { 1446 struct rtable *rt = ip_route_output(net, 1447 imr->imr_multiaddr.s_addr, 1448 0, 0, 0); 1449 if (!IS_ERR(rt)) { 1450 dev = rt->dst.dev; 1451 ip_rt_put(rt); 1452 } 1453 } 1454 if (dev) { 1455 imr->imr_ifindex = dev->ifindex; 1456 idev = __in_dev_get_rtnl(dev); 1457 } 1458 return idev; 1459 } 1460 1461 /* 1462 * Join a socket to a group 1463 */ 1464 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1465 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1466 1467 1468 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1469 __be32 *psfsrc) 1470 { 1471 struct ip_sf_list *psf, *psf_prev; 1472 int rv = 0; 1473 1474 psf_prev = NULL; 1475 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1476 if (psf->sf_inaddr == *psfsrc) 1477 break; 1478 psf_prev = psf; 1479 } 1480 if (!psf || psf->sf_count[sfmode] == 0) { 1481 /* source filter not found, or count wrong => bug */ 1482 return -ESRCH; 1483 } 1484 psf->sf_count[sfmode]--; 1485 if (psf->sf_count[sfmode] == 0) { 1486 ip_rt_multicast_event(pmc->interface); 1487 } 1488 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1489 #ifdef CONFIG_IP_MULTICAST 1490 struct in_device *in_dev = pmc->interface; 1491 #endif 1492 1493 /* no more filters for this source */ 1494 if (psf_prev) 1495 psf_prev->sf_next = psf->sf_next; 1496 else 1497 pmc->sources = psf->sf_next; 1498 #ifdef CONFIG_IP_MULTICAST 1499 if (psf->sf_oldin && 1500 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1501 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1502 IGMP_Unsolicited_Report_Count; 1503 psf->sf_next = pmc->tomb; 1504 pmc->tomb = psf; 1505 rv = 1; 1506 } else 1507 #endif 1508 kfree(psf); 1509 } 1510 return rv; 1511 } 1512 1513 #ifndef CONFIG_IP_MULTICAST 1514 #define igmp_ifc_event(x) do { } while (0) 1515 #endif 1516 1517 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1518 int sfcount, __be32 *psfsrc, int delta) 1519 { 1520 struct ip_mc_list *pmc; 1521 int changerec = 0; 1522 int i, err; 1523 1524 if (!in_dev) 1525 return -ENODEV; 1526 rcu_read_lock(); 1527 for_each_pmc_rcu(in_dev, pmc) { 1528 if (*pmca == pmc->multiaddr) 1529 break; 1530 } 1531 if (!pmc) { 1532 /* MCA not found?? bug */ 1533 rcu_read_unlock(); 1534 return -ESRCH; 1535 } 1536 spin_lock_bh(&pmc->lock); 1537 rcu_read_unlock(); 1538 #ifdef CONFIG_IP_MULTICAST 1539 sf_markstate(pmc); 1540 #endif 1541 if (!delta) { 1542 err = -EINVAL; 1543 if (!pmc->sfcount[sfmode]) 1544 goto out_unlock; 1545 pmc->sfcount[sfmode]--; 1546 } 1547 err = 0; 1548 for (i=0; i<sfcount; i++) { 1549 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1550 1551 changerec |= rv > 0; 1552 if (!err && rv < 0) 1553 err = rv; 1554 } 1555 if (pmc->sfmode == MCAST_EXCLUDE && 1556 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1557 pmc->sfcount[MCAST_INCLUDE]) { 1558 #ifdef CONFIG_IP_MULTICAST 1559 struct ip_sf_list *psf; 1560 #endif 1561 1562 /* filter mode change */ 1563 pmc->sfmode = MCAST_INCLUDE; 1564 #ifdef CONFIG_IP_MULTICAST 1565 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1566 IGMP_Unsolicited_Report_Count; 1567 in_dev->mr_ifc_count = pmc->crcount; 1568 for (psf=pmc->sources; psf; psf = psf->sf_next) 1569 psf->sf_crcount = 0; 1570 igmp_ifc_event(pmc->interface); 1571 } else if (sf_setstate(pmc) || changerec) { 1572 igmp_ifc_event(pmc->interface); 1573 #endif 1574 } 1575 out_unlock: 1576 spin_unlock_bh(&pmc->lock); 1577 return err; 1578 } 1579 1580 /* 1581 * Add multicast single-source filter to the interface list 1582 */ 1583 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1584 __be32 *psfsrc) 1585 { 1586 struct ip_sf_list *psf, *psf_prev; 1587 1588 psf_prev = NULL; 1589 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1590 if (psf->sf_inaddr == *psfsrc) 1591 break; 1592 psf_prev = psf; 1593 } 1594 if (!psf) { 1595 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1596 if (!psf) 1597 return -ENOBUFS; 1598 psf->sf_inaddr = *psfsrc; 1599 if (psf_prev) { 1600 psf_prev->sf_next = psf; 1601 } else 1602 pmc->sources = psf; 1603 } 1604 psf->sf_count[sfmode]++; 1605 if (psf->sf_count[sfmode] == 1) { 1606 ip_rt_multicast_event(pmc->interface); 1607 } 1608 return 0; 1609 } 1610 1611 #ifdef CONFIG_IP_MULTICAST 1612 static void sf_markstate(struct ip_mc_list *pmc) 1613 { 1614 struct ip_sf_list *psf; 1615 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1616 1617 for (psf=pmc->sources; psf; psf=psf->sf_next) 1618 if (pmc->sfcount[MCAST_EXCLUDE]) { 1619 psf->sf_oldin = mca_xcount == 1620 psf->sf_count[MCAST_EXCLUDE] && 1621 !psf->sf_count[MCAST_INCLUDE]; 1622 } else 1623 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1624 } 1625 1626 static int sf_setstate(struct ip_mc_list *pmc) 1627 { 1628 struct ip_sf_list *psf, *dpsf; 1629 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1630 int qrv = pmc->interface->mr_qrv; 1631 int new_in, rv; 1632 1633 rv = 0; 1634 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1635 if (pmc->sfcount[MCAST_EXCLUDE]) { 1636 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1637 !psf->sf_count[MCAST_INCLUDE]; 1638 } else 1639 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1640 if (new_in) { 1641 if (!psf->sf_oldin) { 1642 struct ip_sf_list *prev = NULL; 1643 1644 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1645 if (dpsf->sf_inaddr == psf->sf_inaddr) 1646 break; 1647 prev = dpsf; 1648 } 1649 if (dpsf) { 1650 if (prev) 1651 prev->sf_next = dpsf->sf_next; 1652 else 1653 pmc->tomb = dpsf->sf_next; 1654 kfree(dpsf); 1655 } 1656 psf->sf_crcount = qrv; 1657 rv++; 1658 } 1659 } else if (psf->sf_oldin) { 1660 1661 psf->sf_crcount = 0; 1662 /* 1663 * add or update "delete" records if an active filter 1664 * is now inactive 1665 */ 1666 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1667 if (dpsf->sf_inaddr == psf->sf_inaddr) 1668 break; 1669 if (!dpsf) { 1670 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1671 if (!dpsf) 1672 continue; 1673 *dpsf = *psf; 1674 /* pmc->lock held by callers */ 1675 dpsf->sf_next = pmc->tomb; 1676 pmc->tomb = dpsf; 1677 } 1678 dpsf->sf_crcount = qrv; 1679 rv++; 1680 } 1681 } 1682 return rv; 1683 } 1684 #endif 1685 1686 /* 1687 * Add multicast source filter list to the interface list 1688 */ 1689 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1690 int sfcount, __be32 *psfsrc, int delta) 1691 { 1692 struct ip_mc_list *pmc; 1693 int isexclude; 1694 int i, err; 1695 1696 if (!in_dev) 1697 return -ENODEV; 1698 rcu_read_lock(); 1699 for_each_pmc_rcu(in_dev, pmc) { 1700 if (*pmca == pmc->multiaddr) 1701 break; 1702 } 1703 if (!pmc) { 1704 /* MCA not found?? bug */ 1705 rcu_read_unlock(); 1706 return -ESRCH; 1707 } 1708 spin_lock_bh(&pmc->lock); 1709 rcu_read_unlock(); 1710 1711 #ifdef CONFIG_IP_MULTICAST 1712 sf_markstate(pmc); 1713 #endif 1714 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1715 if (!delta) 1716 pmc->sfcount[sfmode]++; 1717 err = 0; 1718 for (i=0; i<sfcount; i++) { 1719 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1720 if (err) 1721 break; 1722 } 1723 if (err) { 1724 int j; 1725 1726 if (!delta) 1727 pmc->sfcount[sfmode]--; 1728 for (j=0; j<i; j++) 1729 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1730 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1731 #ifdef CONFIG_IP_MULTICAST 1732 struct ip_sf_list *psf; 1733 in_dev = pmc->interface; 1734 #endif 1735 1736 /* filter mode change */ 1737 if (pmc->sfcount[MCAST_EXCLUDE]) 1738 pmc->sfmode = MCAST_EXCLUDE; 1739 else if (pmc->sfcount[MCAST_INCLUDE]) 1740 pmc->sfmode = MCAST_INCLUDE; 1741 #ifdef CONFIG_IP_MULTICAST 1742 /* else no filters; keep old mode for reports */ 1743 1744 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1745 IGMP_Unsolicited_Report_Count; 1746 in_dev->mr_ifc_count = pmc->crcount; 1747 for (psf=pmc->sources; psf; psf = psf->sf_next) 1748 psf->sf_crcount = 0; 1749 igmp_ifc_event(in_dev); 1750 } else if (sf_setstate(pmc)) { 1751 igmp_ifc_event(in_dev); 1752 #endif 1753 } 1754 spin_unlock_bh(&pmc->lock); 1755 return err; 1756 } 1757 1758 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1759 { 1760 struct ip_sf_list *psf, *nextpsf; 1761 1762 for (psf=pmc->tomb; psf; psf=nextpsf) { 1763 nextpsf = psf->sf_next; 1764 kfree(psf); 1765 } 1766 pmc->tomb = NULL; 1767 for (psf=pmc->sources; psf; psf=nextpsf) { 1768 nextpsf = psf->sf_next; 1769 kfree(psf); 1770 } 1771 pmc->sources = NULL; 1772 pmc->sfmode = MCAST_EXCLUDE; 1773 pmc->sfcount[MCAST_INCLUDE] = 0; 1774 pmc->sfcount[MCAST_EXCLUDE] = 1; 1775 } 1776 1777 1778 /* 1779 * Join a multicast group 1780 */ 1781 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1782 { 1783 int err; 1784 __be32 addr = imr->imr_multiaddr.s_addr; 1785 struct ip_mc_socklist *iml = NULL, *i; 1786 struct in_device *in_dev; 1787 struct inet_sock *inet = inet_sk(sk); 1788 struct net *net = sock_net(sk); 1789 int ifindex; 1790 int count = 0; 1791 1792 if (!ipv4_is_multicast(addr)) 1793 return -EINVAL; 1794 1795 rtnl_lock(); 1796 1797 in_dev = ip_mc_find_dev(net, imr); 1798 1799 if (!in_dev) { 1800 iml = NULL; 1801 err = -ENODEV; 1802 goto done; 1803 } 1804 1805 err = -EADDRINUSE; 1806 ifindex = imr->imr_ifindex; 1807 for_each_pmc_rtnl(inet, i) { 1808 if (i->multi.imr_multiaddr.s_addr == addr && 1809 i->multi.imr_ifindex == ifindex) 1810 goto done; 1811 count++; 1812 } 1813 err = -ENOBUFS; 1814 if (count >= sysctl_igmp_max_memberships) 1815 goto done; 1816 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1817 if (iml == NULL) 1818 goto done; 1819 1820 memcpy(&iml->multi, imr, sizeof(*imr)); 1821 iml->next_rcu = inet->mc_list; 1822 iml->sflist = NULL; 1823 iml->sfmode = MCAST_EXCLUDE; 1824 rcu_assign_pointer(inet->mc_list, iml); 1825 ip_mc_inc_group(in_dev, addr); 1826 err = 0; 1827 done: 1828 rtnl_unlock(); 1829 return err; 1830 } 1831 EXPORT_SYMBOL(ip_mc_join_group); 1832 1833 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1834 struct in_device *in_dev) 1835 { 1836 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1837 int err; 1838 1839 if (psf == NULL) { 1840 /* any-source empty exclude case */ 1841 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1842 iml->sfmode, 0, NULL, 0); 1843 } 1844 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1845 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1846 RCU_INIT_POINTER(iml->sflist, NULL); 1847 /* decrease mem now to avoid the memleak warning */ 1848 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1849 kfree_rcu(psf, rcu); 1850 return err; 1851 } 1852 1853 /* 1854 * Ask a socket to leave a group. 1855 */ 1856 1857 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1858 { 1859 struct inet_sock *inet = inet_sk(sk); 1860 struct ip_mc_socklist *iml; 1861 struct ip_mc_socklist __rcu **imlp; 1862 struct in_device *in_dev; 1863 struct net *net = sock_net(sk); 1864 __be32 group = imr->imr_multiaddr.s_addr; 1865 u32 ifindex; 1866 int ret = -EADDRNOTAVAIL; 1867 1868 rtnl_lock(); 1869 in_dev = ip_mc_find_dev(net, imr); 1870 ifindex = imr->imr_ifindex; 1871 for (imlp = &inet->mc_list; 1872 (iml = rtnl_dereference(*imlp)) != NULL; 1873 imlp = &iml->next_rcu) { 1874 if (iml->multi.imr_multiaddr.s_addr != group) 1875 continue; 1876 if (ifindex) { 1877 if (iml->multi.imr_ifindex != ifindex) 1878 continue; 1879 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1880 iml->multi.imr_address.s_addr) 1881 continue; 1882 1883 (void) ip_mc_leave_src(sk, iml, in_dev); 1884 1885 *imlp = iml->next_rcu; 1886 1887 if (in_dev) 1888 ip_mc_dec_group(in_dev, group); 1889 rtnl_unlock(); 1890 /* decrease mem now to avoid the memleak warning */ 1891 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1892 kfree_rcu(iml, rcu); 1893 return 0; 1894 } 1895 if (!in_dev) 1896 ret = -ENODEV; 1897 rtnl_unlock(); 1898 return ret; 1899 } 1900 1901 int ip_mc_source(int add, int omode, struct sock *sk, struct 1902 ip_mreq_source *mreqs, int ifindex) 1903 { 1904 int err; 1905 struct ip_mreqn imr; 1906 __be32 addr = mreqs->imr_multiaddr; 1907 struct ip_mc_socklist *pmc; 1908 struct in_device *in_dev = NULL; 1909 struct inet_sock *inet = inet_sk(sk); 1910 struct ip_sf_socklist *psl; 1911 struct net *net = sock_net(sk); 1912 int leavegroup = 0; 1913 int i, j, rv; 1914 1915 if (!ipv4_is_multicast(addr)) 1916 return -EINVAL; 1917 1918 rtnl_lock(); 1919 1920 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1921 imr.imr_address.s_addr = mreqs->imr_interface; 1922 imr.imr_ifindex = ifindex; 1923 in_dev = ip_mc_find_dev(net, &imr); 1924 1925 if (!in_dev) { 1926 err = -ENODEV; 1927 goto done; 1928 } 1929 err = -EADDRNOTAVAIL; 1930 1931 for_each_pmc_rtnl(inet, pmc) { 1932 if ((pmc->multi.imr_multiaddr.s_addr == 1933 imr.imr_multiaddr.s_addr) && 1934 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1935 break; 1936 } 1937 if (!pmc) { /* must have a prior join */ 1938 err = -EINVAL; 1939 goto done; 1940 } 1941 /* if a source filter was set, must be the same mode as before */ 1942 if (pmc->sflist) { 1943 if (pmc->sfmode != omode) { 1944 err = -EINVAL; 1945 goto done; 1946 } 1947 } else if (pmc->sfmode != omode) { 1948 /* allow mode switches for empty-set filters */ 1949 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1950 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1951 NULL, 0); 1952 pmc->sfmode = omode; 1953 } 1954 1955 psl = rtnl_dereference(pmc->sflist); 1956 if (!add) { 1957 if (!psl) 1958 goto done; /* err = -EADDRNOTAVAIL */ 1959 rv = !0; 1960 for (i=0; i<psl->sl_count; i++) { 1961 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1962 sizeof(__be32)); 1963 if (rv == 0) 1964 break; 1965 } 1966 if (rv) /* source not found */ 1967 goto done; /* err = -EADDRNOTAVAIL */ 1968 1969 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1970 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1971 leavegroup = 1; 1972 goto done; 1973 } 1974 1975 /* update the interface filter */ 1976 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1977 &mreqs->imr_sourceaddr, 1); 1978 1979 for (j=i+1; j<psl->sl_count; j++) 1980 psl->sl_addr[j-1] = psl->sl_addr[j]; 1981 psl->sl_count--; 1982 err = 0; 1983 goto done; 1984 } 1985 /* else, add a new source to the filter */ 1986 1987 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1988 err = -ENOBUFS; 1989 goto done; 1990 } 1991 if (!psl || psl->sl_count == psl->sl_max) { 1992 struct ip_sf_socklist *newpsl; 1993 int count = IP_SFBLOCK; 1994 1995 if (psl) 1996 count += psl->sl_max; 1997 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1998 if (!newpsl) { 1999 err = -ENOBUFS; 2000 goto done; 2001 } 2002 newpsl->sl_max = count; 2003 newpsl->sl_count = count - IP_SFBLOCK; 2004 if (psl) { 2005 for (i=0; i<psl->sl_count; i++) 2006 newpsl->sl_addr[i] = psl->sl_addr[i]; 2007 /* decrease mem now to avoid the memleak warning */ 2008 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2009 kfree_rcu(psl, rcu); 2010 } 2011 rcu_assign_pointer(pmc->sflist, newpsl); 2012 psl = newpsl; 2013 } 2014 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2015 for (i=0; i<psl->sl_count; i++) { 2016 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2017 sizeof(__be32)); 2018 if (rv == 0) 2019 break; 2020 } 2021 if (rv == 0) /* address already there is an error */ 2022 goto done; 2023 for (j=psl->sl_count-1; j>=i; j--) 2024 psl->sl_addr[j+1] = psl->sl_addr[j]; 2025 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2026 psl->sl_count++; 2027 err = 0; 2028 /* update the interface list */ 2029 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2030 &mreqs->imr_sourceaddr, 1); 2031 done: 2032 rtnl_unlock(); 2033 if (leavegroup) 2034 return ip_mc_leave_group(sk, &imr); 2035 return err; 2036 } 2037 2038 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2039 { 2040 int err = 0; 2041 struct ip_mreqn imr; 2042 __be32 addr = msf->imsf_multiaddr; 2043 struct ip_mc_socklist *pmc; 2044 struct in_device *in_dev; 2045 struct inet_sock *inet = inet_sk(sk); 2046 struct ip_sf_socklist *newpsl, *psl; 2047 struct net *net = sock_net(sk); 2048 int leavegroup = 0; 2049 2050 if (!ipv4_is_multicast(addr)) 2051 return -EINVAL; 2052 if (msf->imsf_fmode != MCAST_INCLUDE && 2053 msf->imsf_fmode != MCAST_EXCLUDE) 2054 return -EINVAL; 2055 2056 rtnl_lock(); 2057 2058 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2059 imr.imr_address.s_addr = msf->imsf_interface; 2060 imr.imr_ifindex = ifindex; 2061 in_dev = ip_mc_find_dev(net, &imr); 2062 2063 if (!in_dev) { 2064 err = -ENODEV; 2065 goto done; 2066 } 2067 2068 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2069 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2070 leavegroup = 1; 2071 goto done; 2072 } 2073 2074 for_each_pmc_rtnl(inet, pmc) { 2075 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2076 pmc->multi.imr_ifindex == imr.imr_ifindex) 2077 break; 2078 } 2079 if (!pmc) { /* must have a prior join */ 2080 err = -EINVAL; 2081 goto done; 2082 } 2083 if (msf->imsf_numsrc) { 2084 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2085 GFP_KERNEL); 2086 if (!newpsl) { 2087 err = -ENOBUFS; 2088 goto done; 2089 } 2090 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2091 memcpy(newpsl->sl_addr, msf->imsf_slist, 2092 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2093 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2094 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2095 if (err) { 2096 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2097 goto done; 2098 } 2099 } else { 2100 newpsl = NULL; 2101 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2102 msf->imsf_fmode, 0, NULL, 0); 2103 } 2104 psl = rtnl_dereference(pmc->sflist); 2105 if (psl) { 2106 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2107 psl->sl_count, psl->sl_addr, 0); 2108 /* decrease mem now to avoid the memleak warning */ 2109 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2110 kfree_rcu(psl, rcu); 2111 } else 2112 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2113 0, NULL, 0); 2114 rcu_assign_pointer(pmc->sflist, newpsl); 2115 pmc->sfmode = msf->imsf_fmode; 2116 err = 0; 2117 done: 2118 rtnl_unlock(); 2119 if (leavegroup) 2120 err = ip_mc_leave_group(sk, &imr); 2121 return err; 2122 } 2123 2124 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2125 struct ip_msfilter __user *optval, int __user *optlen) 2126 { 2127 int err, len, count, copycount; 2128 struct ip_mreqn imr; 2129 __be32 addr = msf->imsf_multiaddr; 2130 struct ip_mc_socklist *pmc; 2131 struct in_device *in_dev; 2132 struct inet_sock *inet = inet_sk(sk); 2133 struct ip_sf_socklist *psl; 2134 struct net *net = sock_net(sk); 2135 2136 if (!ipv4_is_multicast(addr)) 2137 return -EINVAL; 2138 2139 rtnl_lock(); 2140 2141 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2142 imr.imr_address.s_addr = msf->imsf_interface; 2143 imr.imr_ifindex = 0; 2144 in_dev = ip_mc_find_dev(net, &imr); 2145 2146 if (!in_dev) { 2147 err = -ENODEV; 2148 goto done; 2149 } 2150 err = -EADDRNOTAVAIL; 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 goto done; 2159 msf->imsf_fmode = pmc->sfmode; 2160 psl = rtnl_dereference(pmc->sflist); 2161 rtnl_unlock(); 2162 if (!psl) { 2163 len = 0; 2164 count = 0; 2165 } else { 2166 count = psl->sl_count; 2167 } 2168 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2169 len = copycount * sizeof(psl->sl_addr[0]); 2170 msf->imsf_numsrc = count; 2171 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2172 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2173 return -EFAULT; 2174 } 2175 if (len && 2176 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2177 return -EFAULT; 2178 return 0; 2179 done: 2180 rtnl_unlock(); 2181 return err; 2182 } 2183 2184 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2185 struct group_filter __user *optval, int __user *optlen) 2186 { 2187 int err, i, count, copycount; 2188 struct sockaddr_in *psin; 2189 __be32 addr; 2190 struct ip_mc_socklist *pmc; 2191 struct inet_sock *inet = inet_sk(sk); 2192 struct ip_sf_socklist *psl; 2193 2194 psin = (struct sockaddr_in *)&gsf->gf_group; 2195 if (psin->sin_family != AF_INET) 2196 return -EINVAL; 2197 addr = psin->sin_addr.s_addr; 2198 if (!ipv4_is_multicast(addr)) 2199 return -EINVAL; 2200 2201 rtnl_lock(); 2202 2203 err = -EADDRNOTAVAIL; 2204 2205 for_each_pmc_rtnl(inet, pmc) { 2206 if (pmc->multi.imr_multiaddr.s_addr == addr && 2207 pmc->multi.imr_ifindex == gsf->gf_interface) 2208 break; 2209 } 2210 if (!pmc) /* must have a prior join */ 2211 goto done; 2212 gsf->gf_fmode = pmc->sfmode; 2213 psl = rtnl_dereference(pmc->sflist); 2214 rtnl_unlock(); 2215 count = psl ? psl->sl_count : 0; 2216 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2217 gsf->gf_numsrc = count; 2218 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2219 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2220 return -EFAULT; 2221 } 2222 for (i=0; i<copycount; i++) { 2223 struct sockaddr_storage ss; 2224 2225 psin = (struct sockaddr_in *)&ss; 2226 memset(&ss, 0, sizeof(ss)); 2227 psin->sin_family = AF_INET; 2228 psin->sin_addr.s_addr = psl->sl_addr[i]; 2229 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2230 return -EFAULT; 2231 } 2232 return 0; 2233 done: 2234 rtnl_unlock(); 2235 return err; 2236 } 2237 2238 /* 2239 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2240 */ 2241 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2242 { 2243 struct inet_sock *inet = inet_sk(sk); 2244 struct ip_mc_socklist *pmc; 2245 struct ip_sf_socklist *psl; 2246 int i; 2247 int ret; 2248 2249 ret = 1; 2250 if (!ipv4_is_multicast(loc_addr)) 2251 goto out; 2252 2253 rcu_read_lock(); 2254 for_each_pmc_rcu(inet, pmc) { 2255 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2256 pmc->multi.imr_ifindex == dif) 2257 break; 2258 } 2259 ret = inet->mc_all; 2260 if (!pmc) 2261 goto unlock; 2262 psl = rcu_dereference(pmc->sflist); 2263 ret = (pmc->sfmode == MCAST_EXCLUDE); 2264 if (!psl) 2265 goto unlock; 2266 2267 for (i=0; i<psl->sl_count; i++) { 2268 if (psl->sl_addr[i] == rmt_addr) 2269 break; 2270 } 2271 ret = 0; 2272 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2273 goto unlock; 2274 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2275 goto unlock; 2276 ret = 1; 2277 unlock: 2278 rcu_read_unlock(); 2279 out: 2280 return ret; 2281 } 2282 2283 /* 2284 * A socket is closing. 2285 */ 2286 2287 void ip_mc_drop_socket(struct sock *sk) 2288 { 2289 struct inet_sock *inet = inet_sk(sk); 2290 struct ip_mc_socklist *iml; 2291 struct net *net = sock_net(sk); 2292 2293 if (inet->mc_list == NULL) 2294 return; 2295 2296 rtnl_lock(); 2297 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2298 struct in_device *in_dev; 2299 2300 inet->mc_list = iml->next_rcu; 2301 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2302 (void) ip_mc_leave_src(sk, iml, in_dev); 2303 if (in_dev != NULL) 2304 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2305 /* decrease mem now to avoid the memleak warning */ 2306 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2307 kfree_rcu(iml, rcu); 2308 } 2309 rtnl_unlock(); 2310 } 2311 2312 /* called with rcu_read_lock() */ 2313 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2314 { 2315 struct ip_mc_list *im; 2316 struct ip_sf_list *psf; 2317 int rv = 0; 2318 2319 for_each_pmc_rcu(in_dev, im) { 2320 if (im->multiaddr == mc_addr) 2321 break; 2322 } 2323 if (im && proto == IPPROTO_IGMP) { 2324 rv = 1; 2325 } else if (im) { 2326 if (src_addr) { 2327 for (psf=im->sources; psf; psf=psf->sf_next) { 2328 if (psf->sf_inaddr == src_addr) 2329 break; 2330 } 2331 if (psf) 2332 rv = psf->sf_count[MCAST_INCLUDE] || 2333 psf->sf_count[MCAST_EXCLUDE] != 2334 im->sfcount[MCAST_EXCLUDE]; 2335 else 2336 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2337 } else 2338 rv = 1; /* unspecified source; tentatively allow */ 2339 } 2340 return rv; 2341 } 2342 2343 #if defined(CONFIG_PROC_FS) 2344 struct igmp_mc_iter_state { 2345 struct seq_net_private p; 2346 struct net_device *dev; 2347 struct in_device *in_dev; 2348 }; 2349 2350 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2351 2352 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2353 { 2354 struct net *net = seq_file_net(seq); 2355 struct ip_mc_list *im = NULL; 2356 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2357 2358 state->in_dev = NULL; 2359 for_each_netdev_rcu(net, state->dev) { 2360 struct in_device *in_dev; 2361 2362 in_dev = __in_dev_get_rcu(state->dev); 2363 if (!in_dev) 2364 continue; 2365 im = rcu_dereference(in_dev->mc_list); 2366 if (im) { 2367 state->in_dev = in_dev; 2368 break; 2369 } 2370 } 2371 return im; 2372 } 2373 2374 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2375 { 2376 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2377 2378 im = rcu_dereference(im->next_rcu); 2379 while (!im) { 2380 state->dev = next_net_device_rcu(state->dev); 2381 if (!state->dev) { 2382 state->in_dev = NULL; 2383 break; 2384 } 2385 state->in_dev = __in_dev_get_rcu(state->dev); 2386 if (!state->in_dev) 2387 continue; 2388 im = rcu_dereference(state->in_dev->mc_list); 2389 } 2390 return im; 2391 } 2392 2393 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2394 { 2395 struct ip_mc_list *im = igmp_mc_get_first(seq); 2396 if (im) 2397 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2398 --pos; 2399 return pos ? NULL : im; 2400 } 2401 2402 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2403 __acquires(rcu) 2404 { 2405 rcu_read_lock(); 2406 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2407 } 2408 2409 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2410 { 2411 struct ip_mc_list *im; 2412 if (v == SEQ_START_TOKEN) 2413 im = igmp_mc_get_first(seq); 2414 else 2415 im = igmp_mc_get_next(seq, v); 2416 ++*pos; 2417 return im; 2418 } 2419 2420 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2421 __releases(rcu) 2422 { 2423 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2424 2425 state->in_dev = NULL; 2426 state->dev = NULL; 2427 rcu_read_unlock(); 2428 } 2429 2430 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2431 { 2432 if (v == SEQ_START_TOKEN) 2433 seq_puts(seq, 2434 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2435 else { 2436 struct ip_mc_list *im = (struct ip_mc_list *)v; 2437 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2438 char *querier; 2439 #ifdef CONFIG_IP_MULTICAST 2440 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2441 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2442 "V3"; 2443 #else 2444 querier = "NONE"; 2445 #endif 2446 2447 if (rcu_dereference(state->in_dev->mc_list) == im) { 2448 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2449 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2450 } 2451 2452 seq_printf(seq, 2453 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2454 im->multiaddr, im->users, 2455 im->tm_running, im->tm_running ? 2456 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2457 im->reporter); 2458 } 2459 return 0; 2460 } 2461 2462 static const struct seq_operations igmp_mc_seq_ops = { 2463 .start = igmp_mc_seq_start, 2464 .next = igmp_mc_seq_next, 2465 .stop = igmp_mc_seq_stop, 2466 .show = igmp_mc_seq_show, 2467 }; 2468 2469 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2470 { 2471 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2472 sizeof(struct igmp_mc_iter_state)); 2473 } 2474 2475 static const struct file_operations igmp_mc_seq_fops = { 2476 .owner = THIS_MODULE, 2477 .open = igmp_mc_seq_open, 2478 .read = seq_read, 2479 .llseek = seq_lseek, 2480 .release = seq_release_net, 2481 }; 2482 2483 struct igmp_mcf_iter_state { 2484 struct seq_net_private p; 2485 struct net_device *dev; 2486 struct in_device *idev; 2487 struct ip_mc_list *im; 2488 }; 2489 2490 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2491 2492 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2493 { 2494 struct net *net = seq_file_net(seq); 2495 struct ip_sf_list *psf = NULL; 2496 struct ip_mc_list *im = NULL; 2497 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2498 2499 state->idev = NULL; 2500 state->im = NULL; 2501 for_each_netdev_rcu(net, state->dev) { 2502 struct in_device *idev; 2503 idev = __in_dev_get_rcu(state->dev); 2504 if (unlikely(idev == NULL)) 2505 continue; 2506 im = rcu_dereference(idev->mc_list); 2507 if (likely(im != NULL)) { 2508 spin_lock_bh(&im->lock); 2509 psf = im->sources; 2510 if (likely(psf != NULL)) { 2511 state->im = im; 2512 state->idev = idev; 2513 break; 2514 } 2515 spin_unlock_bh(&im->lock); 2516 } 2517 } 2518 return psf; 2519 } 2520 2521 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2522 { 2523 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2524 2525 psf = psf->sf_next; 2526 while (!psf) { 2527 spin_unlock_bh(&state->im->lock); 2528 state->im = state->im->next; 2529 while (!state->im) { 2530 state->dev = next_net_device_rcu(state->dev); 2531 if (!state->dev) { 2532 state->idev = NULL; 2533 goto out; 2534 } 2535 state->idev = __in_dev_get_rcu(state->dev); 2536 if (!state->idev) 2537 continue; 2538 state->im = rcu_dereference(state->idev->mc_list); 2539 } 2540 if (!state->im) 2541 break; 2542 spin_lock_bh(&state->im->lock); 2543 psf = state->im->sources; 2544 } 2545 out: 2546 return psf; 2547 } 2548 2549 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2550 { 2551 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2552 if (psf) 2553 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2554 --pos; 2555 return pos ? NULL : psf; 2556 } 2557 2558 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2559 __acquires(rcu) 2560 { 2561 rcu_read_lock(); 2562 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2563 } 2564 2565 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2566 { 2567 struct ip_sf_list *psf; 2568 if (v == SEQ_START_TOKEN) 2569 psf = igmp_mcf_get_first(seq); 2570 else 2571 psf = igmp_mcf_get_next(seq, v); 2572 ++*pos; 2573 return psf; 2574 } 2575 2576 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2577 __releases(rcu) 2578 { 2579 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2580 if (likely(state->im != NULL)) { 2581 spin_unlock_bh(&state->im->lock); 2582 state->im = NULL; 2583 } 2584 state->idev = NULL; 2585 state->dev = NULL; 2586 rcu_read_unlock(); 2587 } 2588 2589 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2590 { 2591 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2592 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2593 2594 if (v == SEQ_START_TOKEN) { 2595 seq_printf(seq, 2596 "%3s %6s " 2597 "%10s %10s %6s %6s\n", "Idx", 2598 "Device", "MCA", 2599 "SRC", "INC", "EXC"); 2600 } else { 2601 seq_printf(seq, 2602 "%3d %6.6s 0x%08x " 2603 "0x%08x %6lu %6lu\n", 2604 state->dev->ifindex, state->dev->name, 2605 ntohl(state->im->multiaddr), 2606 ntohl(psf->sf_inaddr), 2607 psf->sf_count[MCAST_INCLUDE], 2608 psf->sf_count[MCAST_EXCLUDE]); 2609 } 2610 return 0; 2611 } 2612 2613 static const struct seq_operations igmp_mcf_seq_ops = { 2614 .start = igmp_mcf_seq_start, 2615 .next = igmp_mcf_seq_next, 2616 .stop = igmp_mcf_seq_stop, 2617 .show = igmp_mcf_seq_show, 2618 }; 2619 2620 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2621 { 2622 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2623 sizeof(struct igmp_mcf_iter_state)); 2624 } 2625 2626 static const struct file_operations igmp_mcf_seq_fops = { 2627 .owner = THIS_MODULE, 2628 .open = igmp_mcf_seq_open, 2629 .read = seq_read, 2630 .llseek = seq_lseek, 2631 .release = seq_release_net, 2632 }; 2633 2634 static int __net_init igmp_net_init(struct net *net) 2635 { 2636 struct proc_dir_entry *pde; 2637 2638 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2639 if (!pde) 2640 goto out_igmp; 2641 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2642 if (!pde) 2643 goto out_mcfilter; 2644 return 0; 2645 2646 out_mcfilter: 2647 proc_net_remove(net, "igmp"); 2648 out_igmp: 2649 return -ENOMEM; 2650 } 2651 2652 static void __net_exit igmp_net_exit(struct net *net) 2653 { 2654 proc_net_remove(net, "mcfilter"); 2655 proc_net_remove(net, "igmp"); 2656 } 2657 2658 static struct pernet_operations igmp_net_ops = { 2659 .init = igmp_net_init, 2660 .exit = igmp_net_exit, 2661 }; 2662 2663 int __init igmp_mc_proc_init(void) 2664 { 2665 return register_pernet_subsys(&igmp_net_ops); 2666 } 2667 #endif 2668