1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * This code implements the IGMP protocol as defined in RFC1112. There has 5 * been a further revision of this protocol since which is now supported. 6 * 7 * If you have trouble with this module be careful what gcc you have used, 8 * the older version didn't come out right using gcc 2.5.8, the newer one 9 * seems to fall out with gcc 2.6.2. 10 * 11 * Authors: 12 * Alan Cox <alan@lxorguk.ukuu.org.uk> 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 * Fixes: 20 * 21 * Alan Cox : Added lots of __inline__ to optimise 22 * the memory usage of all the tiny little 23 * functions. 24 * Alan Cox : Dumped the header building experiment. 25 * Alan Cox : Minor tweaks ready for multicast routing 26 * and extended IGMP protocol. 27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 28 * writes utterly bogus code otherwise (sigh) 29 * fixed IGMP loopback to behave in the manner 30 * desired by mrouted, fixed the fact it has been 31 * broken since 1.3.6 and cleaned up a few minor 32 * points. 33 * 34 * Chih-Jen Chang : Tried to revise IGMP to Version 2 35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu 36 * The enhancements are mainly based on Steve Deering's 37 * ipmulti-3.5 source code. 38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and 39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of 40 * the mrouted version on that device. 41 * Chih-Jen Chang : Added the max_resp_time parameter to 42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter 43 * to identify the multicast router version 44 * and do what the IGMP version 2 specified. 45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router 46 * Tsu-Sheng Tsao if the specified time expired. 47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. 48 * Alan Cox : Use GFP_ATOMIC in the right places. 49 * Christian Daudt : igmp timer wasn't set for local group 50 * memberships but was being deleted, 51 * which caused a "del_timer() called 52 * from %p with timer not initialized\n" 53 * message (960131). 54 * Christian Daudt : removed del_timer from 55 * igmp_timer_expire function (960205). 56 * Christian Daudt : igmp_heard_report now only calls 57 * igmp_timer_expire if tm->running is 58 * true (960216). 59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made 60 * igmp_heard_query never trigger. Expiry 61 * miscalculation fixed in igmp_heard_query 62 * and random() made to return unsigned to 63 * prevent negative expiry times. 64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport 65 * fix from pending 2.1.x patches. 66 * Alan Cox: Forget to enable FDDI support earlier. 67 * Alexey Kuznetsov: Fixed leaving groups on device down. 68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. 69 * David L Stevens: IGMPv3 support, with help from 70 * Vinay Kulkarni 71 */ 72 73 #include <linux/module.h> 74 #include <linux/slab.h> 75 #include <asm/uaccess.h> 76 #include <linux/types.h> 77 #include <linux/kernel.h> 78 #include <linux/jiffies.h> 79 #include <linux/string.h> 80 #include <linux/socket.h> 81 #include <linux/sockios.h> 82 #include <linux/in.h> 83 #include <linux/inet.h> 84 #include <linux/netdevice.h> 85 #include <linux/skbuff.h> 86 #include <linux/inetdevice.h> 87 #include <linux/igmp.h> 88 #include <linux/if_arp.h> 89 #include <linux/rtnetlink.h> 90 #include <linux/times.h> 91 92 #include <net/net_namespace.h> 93 #include <net/arp.h> 94 #include <net/ip.h> 95 #include <net/protocol.h> 96 #include <net/route.h> 97 #include <net/sock.h> 98 #include <net/checksum.h> 99 #include <linux/netfilter_ipv4.h> 100 #ifdef CONFIG_IP_MROUTE 101 #include <linux/mroute.h> 102 #endif 103 #ifdef CONFIG_PROC_FS 104 #include <linux/proc_fs.h> 105 #include <linux/seq_file.h> 106 #endif 107 108 #define IP_MAX_MEMBERSHIPS 20 109 #define IP_MAX_MSF 10 110 111 #ifdef CONFIG_IP_MULTICAST 112 /* Parameter names and values are taken from igmp-v2-06 draft */ 113 114 #define IGMP_V1_Router_Present_Timeout (400*HZ) 115 #define IGMP_V2_Router_Present_Timeout (400*HZ) 116 #define IGMP_Unsolicited_Report_Interval (10*HZ) 117 #define IGMP_Query_Response_Interval (10*HZ) 118 #define IGMP_Unsolicited_Report_Count 2 119 120 121 #define IGMP_Initial_Report_Delay (1) 122 123 /* IGMP_Initial_Report_Delay is not from IGMP specs! 124 * IGMP specs require to report membership immediately after 125 * joining a group, but we delay the first report by a 126 * small interval. It seems more natural and still does not 127 * contradict to specs provided this delay is small enough. 128 */ 129 130 #define IGMP_V1_SEEN(in_dev) \ 131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ 132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ 133 ((in_dev)->mr_v1_seen && \ 134 time_before(jiffies, (in_dev)->mr_v1_seen))) 135 #define IGMP_V2_SEEN(in_dev) \ 136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ 137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ 138 ((in_dev)->mr_v2_seen && \ 139 time_before(jiffies, (in_dev)->mr_v2_seen))) 140 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); 143 static void igmpv3_clear_delrec(struct in_device *in_dev); 144 static int sf_setstate(struct ip_mc_list *pmc); 145 static void sf_markstate(struct ip_mc_list *pmc); 146 #endif 147 static void ip_mc_clear_src(struct ip_mc_list *pmc); 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 149 int sfcount, __be32 *psfsrc, int delta); 150 151 static void ip_ma_put(struct ip_mc_list *im) 152 { 153 if (atomic_dec_and_test(&im->refcnt)) { 154 in_dev_put(im->interface); 155 kfree_rcu(im, rcu); 156 } 157 } 158 159 #define for_each_pmc_rcu(in_dev, pmc) \ 160 for (pmc = rcu_dereference(in_dev->mc_list); \ 161 pmc != NULL; \ 162 pmc = rcu_dereference(pmc->next_rcu)) 163 164 #define for_each_pmc_rtnl(in_dev, pmc) \ 165 for (pmc = rtnl_dereference(in_dev->mc_list); \ 166 pmc != NULL; \ 167 pmc = rtnl_dereference(pmc->next_rcu)) 168 169 #ifdef CONFIG_IP_MULTICAST 170 171 /* 172 * Timer management 173 */ 174 175 static void igmp_stop_timer(struct ip_mc_list *im) 176 { 177 spin_lock_bh(&im->lock); 178 if (del_timer(&im->timer)) 179 atomic_dec(&im->refcnt); 180 im->tm_running = 0; 181 im->reporter = 0; 182 im->unsolicit_count = 0; 183 spin_unlock_bh(&im->lock); 184 } 185 186 /* It must be called with locked im->lock */ 187 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 188 { 189 int tv = net_random() % max_delay; 190 191 im->tm_running = 1; 192 if (!mod_timer(&im->timer, jiffies+tv+2)) 193 atomic_inc(&im->refcnt); 194 } 195 196 static void igmp_gq_start_timer(struct in_device *in_dev) 197 { 198 int tv = net_random() % in_dev->mr_maxdelay; 199 200 in_dev->mr_gq_running = 1; 201 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 202 in_dev_hold(in_dev); 203 } 204 205 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 206 { 207 int tv = net_random() % delay; 208 209 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 210 in_dev_hold(in_dev); 211 } 212 213 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 214 { 215 spin_lock_bh(&im->lock); 216 im->unsolicit_count = 0; 217 if (del_timer(&im->timer)) { 218 if ((long)(im->timer.expires-jiffies) < max_delay) { 219 add_timer(&im->timer); 220 im->tm_running = 1; 221 spin_unlock_bh(&im->lock); 222 return; 223 } 224 atomic_dec(&im->refcnt); 225 } 226 igmp_start_timer(im, max_delay); 227 spin_unlock_bh(&im->lock); 228 } 229 230 231 /* 232 * Send an IGMP report. 233 */ 234 235 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 236 237 238 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 239 int gdeleted, int sdeleted) 240 { 241 switch (type) { 242 case IGMPV3_MODE_IS_INCLUDE: 243 case IGMPV3_MODE_IS_EXCLUDE: 244 if (gdeleted || sdeleted) 245 return 0; 246 if (!(pmc->gsquery && !psf->sf_gsresp)) { 247 if (pmc->sfmode == MCAST_INCLUDE) 248 return 1; 249 /* don't include if this source is excluded 250 * in all filters 251 */ 252 if (psf->sf_count[MCAST_INCLUDE]) 253 return type == IGMPV3_MODE_IS_INCLUDE; 254 return pmc->sfcount[MCAST_EXCLUDE] == 255 psf->sf_count[MCAST_EXCLUDE]; 256 } 257 return 0; 258 case IGMPV3_CHANGE_TO_INCLUDE: 259 if (gdeleted || sdeleted) 260 return 0; 261 return psf->sf_count[MCAST_INCLUDE] != 0; 262 case IGMPV3_CHANGE_TO_EXCLUDE: 263 if (gdeleted || sdeleted) 264 return 0; 265 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 266 psf->sf_count[MCAST_INCLUDE]) 267 return 0; 268 return pmc->sfcount[MCAST_EXCLUDE] == 269 psf->sf_count[MCAST_EXCLUDE]; 270 case IGMPV3_ALLOW_NEW_SOURCES: 271 if (gdeleted || !psf->sf_crcount) 272 return 0; 273 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 274 case IGMPV3_BLOCK_OLD_SOURCES: 275 if (pmc->sfmode == MCAST_INCLUDE) 276 return gdeleted || (psf->sf_crcount && sdeleted); 277 return psf->sf_crcount && !gdeleted && !sdeleted; 278 } 279 return 0; 280 } 281 282 static int 283 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 284 { 285 struct ip_sf_list *psf; 286 int scount = 0; 287 288 for (psf=pmc->sources; psf; psf=psf->sf_next) { 289 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 290 continue; 291 scount++; 292 } 293 return scount; 294 } 295 296 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) 297 298 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 299 { 300 struct sk_buff *skb; 301 struct rtable *rt; 302 struct iphdr *pip; 303 struct igmpv3_report *pig; 304 struct net *net = dev_net(dev); 305 struct flowi4 fl4; 306 int hlen = LL_RESERVED_SPACE(dev); 307 int tlen = dev->needed_tailroom; 308 309 while (1) { 310 skb = alloc_skb(size + hlen + tlen, 311 GFP_ATOMIC | __GFP_NOWARN); 312 if (skb) 313 break; 314 size >>= 1; 315 if (size < 256) 316 return NULL; 317 } 318 igmp_skb_size(skb) = size; 319 320 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, 321 0, 0, 322 IPPROTO_IGMP, 0, dev->ifindex); 323 if (IS_ERR(rt)) { 324 kfree_skb(skb); 325 return NULL; 326 } 327 328 skb_dst_set(skb, &rt->dst); 329 skb->dev = dev; 330 331 skb_reserve(skb, hlen); 332 333 skb_reset_network_header(skb); 334 pip = ip_hdr(skb); 335 skb_put(skb, sizeof(struct iphdr) + 4); 336 337 pip->version = 4; 338 pip->ihl = (sizeof(struct iphdr)+4)>>2; 339 pip->tos = 0xc0; 340 pip->frag_off = htons(IP_DF); 341 pip->ttl = 1; 342 pip->daddr = fl4.daddr; 343 pip->saddr = fl4.saddr; 344 pip->protocol = IPPROTO_IGMP; 345 pip->tot_len = 0; /* filled in later */ 346 ip_select_ident(pip, &rt->dst, NULL); 347 ((u8 *)&pip[1])[0] = IPOPT_RA; 348 ((u8 *)&pip[1])[1] = 4; 349 ((u8 *)&pip[1])[2] = 0; 350 ((u8 *)&pip[1])[3] = 0; 351 352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 353 skb_put(skb, sizeof(*pig)); 354 pig = igmpv3_report_hdr(skb); 355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 356 pig->resv1 = 0; 357 pig->csum = 0; 358 pig->resv2 = 0; 359 pig->ngrec = 0; 360 return skb; 361 } 362 363 static int igmpv3_sendpack(struct sk_buff *skb) 364 { 365 struct igmphdr *pig = igmp_hdr(skb); 366 const int igmplen = skb->tail - skb->transport_header; 367 368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 369 370 return ip_local_out(skb); 371 } 372 373 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 374 { 375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 376 } 377 378 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 379 int type, struct igmpv3_grec **ppgr) 380 { 381 struct net_device *dev = pmc->interface->dev; 382 struct igmpv3_report *pih; 383 struct igmpv3_grec *pgr; 384 385 if (!skb) 386 skb = igmpv3_newpack(dev, dev->mtu); 387 if (!skb) 388 return NULL; 389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 390 pgr->grec_type = type; 391 pgr->grec_auxwords = 0; 392 pgr->grec_nsrcs = 0; 393 pgr->grec_mca = pmc->multiaddr; 394 pih = igmpv3_report_hdr(skb); 395 pih->ngrec = htons(ntohs(pih->ngrec)+1); 396 *ppgr = pgr; 397 return skb; 398 } 399 400 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ 401 skb_tailroom(skb)) : 0) 402 403 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 404 int type, int gdeleted, int sdeleted) 405 { 406 struct net_device *dev = pmc->interface->dev; 407 struct igmpv3_report *pih; 408 struct igmpv3_grec *pgr = NULL; 409 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 410 int scount, stotal, first, isquery, truncate; 411 412 if (pmc->multiaddr == IGMP_ALL_HOSTS) 413 return skb; 414 415 isquery = type == IGMPV3_MODE_IS_INCLUDE || 416 type == IGMPV3_MODE_IS_EXCLUDE; 417 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 418 type == IGMPV3_CHANGE_TO_EXCLUDE; 419 420 stotal = scount = 0; 421 422 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 423 424 if (!*psf_list) 425 goto empty_source; 426 427 pih = skb ? igmpv3_report_hdr(skb) : NULL; 428 429 /* EX and TO_EX get a fresh packet, if needed */ 430 if (truncate) { 431 if (pih && pih->ngrec && 432 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 433 if (skb) 434 igmpv3_sendpack(skb); 435 skb = igmpv3_newpack(dev, dev->mtu); 436 } 437 } 438 first = 1; 439 psf_prev = NULL; 440 for (psf=*psf_list; psf; psf=psf_next) { 441 __be32 *psrc; 442 443 psf_next = psf->sf_next; 444 445 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 446 psf_prev = psf; 447 continue; 448 } 449 450 /* clear marks on query responses */ 451 if (isquery) 452 psf->sf_gsresp = 0; 453 454 if (AVAILABLE(skb) < sizeof(__be32) + 455 first*sizeof(struct igmpv3_grec)) { 456 if (truncate && !first) 457 break; /* truncate these */ 458 if (pgr) 459 pgr->grec_nsrcs = htons(scount); 460 if (skb) 461 igmpv3_sendpack(skb); 462 skb = igmpv3_newpack(dev, dev->mtu); 463 first = 1; 464 scount = 0; 465 } 466 if (first) { 467 skb = add_grhead(skb, pmc, type, &pgr); 468 first = 0; 469 } 470 if (!skb) 471 return NULL; 472 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 473 *psrc = psf->sf_inaddr; 474 scount++; stotal++; 475 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 476 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 477 psf->sf_crcount--; 478 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 479 if (psf_prev) 480 psf_prev->sf_next = psf->sf_next; 481 else 482 *psf_list = psf->sf_next; 483 kfree(psf); 484 continue; 485 } 486 } 487 psf_prev = psf; 488 } 489 490 empty_source: 491 if (!stotal) { 492 if (type == IGMPV3_ALLOW_NEW_SOURCES || 493 type == IGMPV3_BLOCK_OLD_SOURCES) 494 return skb; 495 if (pmc->crcount || isquery) { 496 /* make sure we have room for group header */ 497 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 498 igmpv3_sendpack(skb); 499 skb = NULL; /* add_grhead will get a new one */ 500 } 501 skb = add_grhead(skb, pmc, type, &pgr); 502 } 503 } 504 if (pgr) 505 pgr->grec_nsrcs = htons(scount); 506 507 if (isquery) 508 pmc->gsquery = 0; /* clear query state on report */ 509 return skb; 510 } 511 512 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 513 { 514 struct sk_buff *skb = NULL; 515 int type; 516 517 if (!pmc) { 518 rcu_read_lock(); 519 for_each_pmc_rcu(in_dev, pmc) { 520 if (pmc->multiaddr == IGMP_ALL_HOSTS) 521 continue; 522 spin_lock_bh(&pmc->lock); 523 if (pmc->sfcount[MCAST_EXCLUDE]) 524 type = IGMPV3_MODE_IS_EXCLUDE; 525 else 526 type = IGMPV3_MODE_IS_INCLUDE; 527 skb = add_grec(skb, pmc, type, 0, 0); 528 spin_unlock_bh(&pmc->lock); 529 } 530 rcu_read_unlock(); 531 } else { 532 spin_lock_bh(&pmc->lock); 533 if (pmc->sfcount[MCAST_EXCLUDE]) 534 type = IGMPV3_MODE_IS_EXCLUDE; 535 else 536 type = IGMPV3_MODE_IS_INCLUDE; 537 skb = add_grec(skb, pmc, type, 0, 0); 538 spin_unlock_bh(&pmc->lock); 539 } 540 if (!skb) 541 return 0; 542 return igmpv3_sendpack(skb); 543 } 544 545 /* 546 * remove zero-count source records from a source filter list 547 */ 548 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 549 { 550 struct ip_sf_list *psf_prev, *psf_next, *psf; 551 552 psf_prev = NULL; 553 for (psf=*ppsf; psf; psf = psf_next) { 554 psf_next = psf->sf_next; 555 if (psf->sf_crcount == 0) { 556 if (psf_prev) 557 psf_prev->sf_next = psf->sf_next; 558 else 559 *ppsf = psf->sf_next; 560 kfree(psf); 561 } else 562 psf_prev = psf; 563 } 564 } 565 566 static void igmpv3_send_cr(struct in_device *in_dev) 567 { 568 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 569 struct sk_buff *skb = NULL; 570 int type, dtype; 571 572 rcu_read_lock(); 573 spin_lock_bh(&in_dev->mc_tomb_lock); 574 575 /* deleted MCA's */ 576 pmc_prev = NULL; 577 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 578 pmc_next = pmc->next; 579 if (pmc->sfmode == MCAST_INCLUDE) { 580 type = IGMPV3_BLOCK_OLD_SOURCES; 581 dtype = IGMPV3_BLOCK_OLD_SOURCES; 582 skb = add_grec(skb, pmc, type, 1, 0); 583 skb = add_grec(skb, pmc, dtype, 1, 1); 584 } 585 if (pmc->crcount) { 586 if (pmc->sfmode == MCAST_EXCLUDE) { 587 type = IGMPV3_CHANGE_TO_INCLUDE; 588 skb = add_grec(skb, pmc, type, 1, 0); 589 } 590 pmc->crcount--; 591 if (pmc->crcount == 0) { 592 igmpv3_clear_zeros(&pmc->tomb); 593 igmpv3_clear_zeros(&pmc->sources); 594 } 595 } 596 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 597 if (pmc_prev) 598 pmc_prev->next = pmc_next; 599 else 600 in_dev->mc_tomb = pmc_next; 601 in_dev_put(pmc->interface); 602 kfree(pmc); 603 } else 604 pmc_prev = pmc; 605 } 606 spin_unlock_bh(&in_dev->mc_tomb_lock); 607 608 /* change recs */ 609 for_each_pmc_rcu(in_dev, pmc) { 610 spin_lock_bh(&pmc->lock); 611 if (pmc->sfcount[MCAST_EXCLUDE]) { 612 type = IGMPV3_BLOCK_OLD_SOURCES; 613 dtype = IGMPV3_ALLOW_NEW_SOURCES; 614 } else { 615 type = IGMPV3_ALLOW_NEW_SOURCES; 616 dtype = IGMPV3_BLOCK_OLD_SOURCES; 617 } 618 skb = add_grec(skb, pmc, type, 0, 0); 619 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 620 621 /* filter mode changes */ 622 if (pmc->crcount) { 623 if (pmc->sfmode == MCAST_EXCLUDE) 624 type = IGMPV3_CHANGE_TO_EXCLUDE; 625 else 626 type = IGMPV3_CHANGE_TO_INCLUDE; 627 skb = add_grec(skb, pmc, type, 0, 0); 628 pmc->crcount--; 629 } 630 spin_unlock_bh(&pmc->lock); 631 } 632 rcu_read_unlock(); 633 634 if (!skb) 635 return; 636 (void) igmpv3_sendpack(skb); 637 } 638 639 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 640 int type) 641 { 642 struct sk_buff *skb; 643 struct iphdr *iph; 644 struct igmphdr *ih; 645 struct rtable *rt; 646 struct net_device *dev = in_dev->dev; 647 struct net *net = dev_net(dev); 648 __be32 group = pmc ? pmc->multiaddr : 0; 649 struct flowi4 fl4; 650 __be32 dst; 651 int hlen, tlen; 652 653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 654 return igmpv3_send_report(in_dev, pmc); 655 else if (type == IGMP_HOST_LEAVE_MESSAGE) 656 dst = IGMP_ALL_ROUTER; 657 else 658 dst = group; 659 660 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, 661 0, 0, 662 IPPROTO_IGMP, 0, dev->ifindex); 663 if (IS_ERR(rt)) 664 return -1; 665 666 hlen = LL_RESERVED_SPACE(dev); 667 tlen = dev->needed_tailroom; 668 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); 669 if (skb == NULL) { 670 ip_rt_put(rt); 671 return -1; 672 } 673 674 skb_dst_set(skb, &rt->dst); 675 676 skb_reserve(skb, hlen); 677 678 skb_reset_network_header(skb); 679 iph = ip_hdr(skb); 680 skb_put(skb, sizeof(struct iphdr) + 4); 681 682 iph->version = 4; 683 iph->ihl = (sizeof(struct iphdr)+4)>>2; 684 iph->tos = 0xc0; 685 iph->frag_off = htons(IP_DF); 686 iph->ttl = 1; 687 iph->daddr = dst; 688 iph->saddr = fl4.saddr; 689 iph->protocol = IPPROTO_IGMP; 690 ip_select_ident(iph, &rt->dst, NULL); 691 ((u8 *)&iph[1])[0] = IPOPT_RA; 692 ((u8 *)&iph[1])[1] = 4; 693 ((u8 *)&iph[1])[2] = 0; 694 ((u8 *)&iph[1])[3] = 0; 695 696 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 697 ih->type = type; 698 ih->code = 0; 699 ih->csum = 0; 700 ih->group = group; 701 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 702 703 return ip_local_out(skb); 704 } 705 706 static void igmp_gq_timer_expire(unsigned long data) 707 { 708 struct in_device *in_dev = (struct in_device *)data; 709 710 in_dev->mr_gq_running = 0; 711 igmpv3_send_report(in_dev, NULL); 712 __in_dev_put(in_dev); 713 } 714 715 static void igmp_ifc_timer_expire(unsigned long data) 716 { 717 struct in_device *in_dev = (struct in_device *)data; 718 719 igmpv3_send_cr(in_dev); 720 if (in_dev->mr_ifc_count) { 721 in_dev->mr_ifc_count--; 722 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 723 } 724 __in_dev_put(in_dev); 725 } 726 727 static void igmp_ifc_event(struct in_device *in_dev) 728 { 729 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 730 return; 731 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 732 IGMP_Unsolicited_Report_Count; 733 igmp_ifc_start_timer(in_dev, 1); 734 } 735 736 737 static void igmp_timer_expire(unsigned long data) 738 { 739 struct ip_mc_list *im=(struct ip_mc_list *)data; 740 struct in_device *in_dev = im->interface; 741 742 spin_lock(&im->lock); 743 im->tm_running = 0; 744 745 if (im->unsolicit_count) { 746 im->unsolicit_count--; 747 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 748 } 749 im->reporter = 1; 750 spin_unlock(&im->lock); 751 752 if (IGMP_V1_SEEN(in_dev)) 753 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 754 else if (IGMP_V2_SEEN(in_dev)) 755 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 756 else 757 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 758 759 ip_ma_put(im); 760 } 761 762 /* mark EXCLUDE-mode sources */ 763 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 764 { 765 struct ip_sf_list *psf; 766 int i, scount; 767 768 scount = 0; 769 for (psf=pmc->sources; psf; psf=psf->sf_next) { 770 if (scount == nsrcs) 771 break; 772 for (i=0; i<nsrcs; i++) { 773 /* skip inactive filters */ 774 if (psf->sf_count[MCAST_INCLUDE] || 775 pmc->sfcount[MCAST_EXCLUDE] != 776 psf->sf_count[MCAST_EXCLUDE]) 777 break; 778 if (srcs[i] == psf->sf_inaddr) { 779 scount++; 780 break; 781 } 782 } 783 } 784 pmc->gsquery = 0; 785 if (scount == nsrcs) /* all sources excluded */ 786 return 0; 787 return 1; 788 } 789 790 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 791 { 792 struct ip_sf_list *psf; 793 int i, scount; 794 795 if (pmc->sfmode == MCAST_EXCLUDE) 796 return igmp_xmarksources(pmc, nsrcs, srcs); 797 798 /* mark INCLUDE-mode sources */ 799 scount = 0; 800 for (psf=pmc->sources; psf; psf=psf->sf_next) { 801 if (scount == nsrcs) 802 break; 803 for (i=0; i<nsrcs; i++) 804 if (srcs[i] == psf->sf_inaddr) { 805 psf->sf_gsresp = 1; 806 scount++; 807 break; 808 } 809 } 810 if (!scount) { 811 pmc->gsquery = 0; 812 return 0; 813 } 814 pmc->gsquery = 1; 815 return 1; 816 } 817 818 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 819 { 820 struct ip_mc_list *im; 821 822 /* Timers are only set for non-local groups */ 823 824 if (group == IGMP_ALL_HOSTS) 825 return; 826 827 rcu_read_lock(); 828 for_each_pmc_rcu(in_dev, im) { 829 if (im->multiaddr == group) { 830 igmp_stop_timer(im); 831 break; 832 } 833 } 834 rcu_read_unlock(); 835 } 836 837 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 838 int len) 839 { 840 struct igmphdr *ih = igmp_hdr(skb); 841 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 842 struct ip_mc_list *im; 843 __be32 group = ih->group; 844 int max_delay; 845 int mark = 0; 846 847 848 if (len == 8) { 849 if (ih->code == 0) { 850 /* Alas, old v1 router presents here. */ 851 852 max_delay = IGMP_Query_Response_Interval; 853 in_dev->mr_v1_seen = jiffies + 854 IGMP_V1_Router_Present_Timeout; 855 group = 0; 856 } else { 857 /* v2 router present */ 858 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 859 in_dev->mr_v2_seen = jiffies + 860 IGMP_V2_Router_Present_Timeout; 861 } 862 /* cancel the interface change timer */ 863 in_dev->mr_ifc_count = 0; 864 if (del_timer(&in_dev->mr_ifc_timer)) 865 __in_dev_put(in_dev); 866 /* clear deleted report items */ 867 igmpv3_clear_delrec(in_dev); 868 } else if (len < 12) { 869 return; /* ignore bogus packet; freed by caller */ 870 } else if (IGMP_V1_SEEN(in_dev)) { 871 /* This is a v3 query with v1 queriers present */ 872 max_delay = IGMP_Query_Response_Interval; 873 group = 0; 874 } else if (IGMP_V2_SEEN(in_dev)) { 875 /* this is a v3 query with v2 queriers present; 876 * Interpretation of the max_delay code is problematic here. 877 * A real v2 host would use ih_code directly, while v3 has a 878 * different encoding. We use the v3 encoding as more likely 879 * to be intended in a v3 query. 880 */ 881 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 882 if (!max_delay) 883 max_delay = 1; /* can't mod w/ 0 */ 884 } else { /* v3 */ 885 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 886 return; 887 888 ih3 = igmpv3_query_hdr(skb); 889 if (ih3->nsrcs) { 890 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 891 + ntohs(ih3->nsrcs)*sizeof(__be32))) 892 return; 893 ih3 = igmpv3_query_hdr(skb); 894 } 895 896 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 897 if (!max_delay) 898 max_delay = 1; /* can't mod w/ 0 */ 899 in_dev->mr_maxdelay = max_delay; 900 if (ih3->qrv) 901 in_dev->mr_qrv = ih3->qrv; 902 if (!group) { /* general query */ 903 if (ih3->nsrcs) 904 return; /* no sources allowed */ 905 igmp_gq_start_timer(in_dev); 906 return; 907 } 908 /* mark sources to include, if group & source-specific */ 909 mark = ih3->nsrcs != 0; 910 } 911 912 /* 913 * - Start the timers in all of our membership records 914 * that the query applies to for the interface on 915 * which the query arrived excl. those that belong 916 * to a "local" group (224.0.0.X) 917 * - For timers already running check if they need to 918 * be reset. 919 * - Use the igmp->igmp_code field as the maximum 920 * delay possible 921 */ 922 rcu_read_lock(); 923 for_each_pmc_rcu(in_dev, im) { 924 int changed; 925 926 if (group && group != im->multiaddr) 927 continue; 928 if (im->multiaddr == IGMP_ALL_HOSTS) 929 continue; 930 spin_lock_bh(&im->lock); 931 if (im->tm_running) 932 im->gsquery = im->gsquery && mark; 933 else 934 im->gsquery = mark; 935 changed = !im->gsquery || 936 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 937 spin_unlock_bh(&im->lock); 938 if (changed) 939 igmp_mod_timer(im, max_delay); 940 } 941 rcu_read_unlock(); 942 } 943 944 /* called in rcu_read_lock() section */ 945 int igmp_rcv(struct sk_buff *skb) 946 { 947 /* This basically follows the spec line by line -- see RFC1112 */ 948 struct igmphdr *ih; 949 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 950 int len = skb->len; 951 952 if (in_dev == NULL) 953 goto drop; 954 955 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 956 goto drop; 957 958 switch (skb->ip_summed) { 959 case CHECKSUM_COMPLETE: 960 if (!csum_fold(skb->csum)) 961 break; 962 /* fall through */ 963 case CHECKSUM_NONE: 964 skb->csum = 0; 965 if (__skb_checksum_complete(skb)) 966 goto drop; 967 } 968 969 ih = igmp_hdr(skb); 970 switch (ih->type) { 971 case IGMP_HOST_MEMBERSHIP_QUERY: 972 igmp_heard_query(in_dev, skb, len); 973 break; 974 case IGMP_HOST_MEMBERSHIP_REPORT: 975 case IGMPV2_HOST_MEMBERSHIP_REPORT: 976 /* Is it our report looped back? */ 977 if (rt_is_output_route(skb_rtable(skb))) 978 break; 979 /* don't rely on MC router hearing unicast reports */ 980 if (skb->pkt_type == PACKET_MULTICAST || 981 skb->pkt_type == PACKET_BROADCAST) 982 igmp_heard_report(in_dev, ih->group); 983 break; 984 case IGMP_PIM: 985 #ifdef CONFIG_IP_PIMSM_V1 986 return pim_rcv_v1(skb); 987 #endif 988 case IGMPV3_HOST_MEMBERSHIP_REPORT: 989 case IGMP_DVMRP: 990 case IGMP_TRACE: 991 case IGMP_HOST_LEAVE_MESSAGE: 992 case IGMP_MTRACE: 993 case IGMP_MTRACE_RESP: 994 break; 995 default: 996 break; 997 } 998 999 drop: 1000 kfree_skb(skb); 1001 return 0; 1002 } 1003 1004 #endif 1005 1006 1007 /* 1008 * Add a filter to a device 1009 */ 1010 1011 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1012 { 1013 char buf[MAX_ADDR_LEN]; 1014 struct net_device *dev = in_dev->dev; 1015 1016 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1017 We will get multicast token leakage, when IFF_MULTICAST 1018 is changed. This check should be done in ndo_set_rx_mode 1019 routine. Something sort of: 1020 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1021 --ANK 1022 */ 1023 if (arp_mc_map(addr, buf, dev, 0) == 0) 1024 dev_mc_add(dev, buf); 1025 } 1026 1027 /* 1028 * Remove a filter from a device 1029 */ 1030 1031 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1032 { 1033 char buf[MAX_ADDR_LEN]; 1034 struct net_device *dev = in_dev->dev; 1035 1036 if (arp_mc_map(addr, buf, dev, 0) == 0) 1037 dev_mc_del(dev, buf); 1038 } 1039 1040 #ifdef CONFIG_IP_MULTICAST 1041 /* 1042 * deleted ip_mc_list manipulation 1043 */ 1044 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1045 { 1046 struct ip_mc_list *pmc; 1047 1048 /* this is an "ip_mc_list" for convenience; only the fields below 1049 * are actually used. In particular, the refcnt and users are not 1050 * used for management of the delete list. Using the same structure 1051 * for deleted items allows change reports to use common code with 1052 * non-deleted or query-response MCA's. 1053 */ 1054 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1055 if (!pmc) 1056 return; 1057 spin_lock_bh(&im->lock); 1058 pmc->interface = im->interface; 1059 in_dev_hold(in_dev); 1060 pmc->multiaddr = im->multiaddr; 1061 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1062 IGMP_Unsolicited_Report_Count; 1063 pmc->sfmode = im->sfmode; 1064 if (pmc->sfmode == MCAST_INCLUDE) { 1065 struct ip_sf_list *psf; 1066 1067 pmc->tomb = im->tomb; 1068 pmc->sources = im->sources; 1069 im->tomb = im->sources = NULL; 1070 for (psf=pmc->sources; psf; psf=psf->sf_next) 1071 psf->sf_crcount = pmc->crcount; 1072 } 1073 spin_unlock_bh(&im->lock); 1074 1075 spin_lock_bh(&in_dev->mc_tomb_lock); 1076 pmc->next = in_dev->mc_tomb; 1077 in_dev->mc_tomb = pmc; 1078 spin_unlock_bh(&in_dev->mc_tomb_lock); 1079 } 1080 1081 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1082 { 1083 struct ip_mc_list *pmc, *pmc_prev; 1084 struct ip_sf_list *psf, *psf_next; 1085 1086 spin_lock_bh(&in_dev->mc_tomb_lock); 1087 pmc_prev = NULL; 1088 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1089 if (pmc->multiaddr == multiaddr) 1090 break; 1091 pmc_prev = pmc; 1092 } 1093 if (pmc) { 1094 if (pmc_prev) 1095 pmc_prev->next = pmc->next; 1096 else 1097 in_dev->mc_tomb = pmc->next; 1098 } 1099 spin_unlock_bh(&in_dev->mc_tomb_lock); 1100 if (pmc) { 1101 for (psf=pmc->tomb; psf; psf=psf_next) { 1102 psf_next = psf->sf_next; 1103 kfree(psf); 1104 } 1105 in_dev_put(pmc->interface); 1106 kfree(pmc); 1107 } 1108 } 1109 1110 static void igmpv3_clear_delrec(struct in_device *in_dev) 1111 { 1112 struct ip_mc_list *pmc, *nextpmc; 1113 1114 spin_lock_bh(&in_dev->mc_tomb_lock); 1115 pmc = in_dev->mc_tomb; 1116 in_dev->mc_tomb = NULL; 1117 spin_unlock_bh(&in_dev->mc_tomb_lock); 1118 1119 for (; pmc; pmc = nextpmc) { 1120 nextpmc = pmc->next; 1121 ip_mc_clear_src(pmc); 1122 in_dev_put(pmc->interface); 1123 kfree(pmc); 1124 } 1125 /* clear dead sources, too */ 1126 rcu_read_lock(); 1127 for_each_pmc_rcu(in_dev, pmc) { 1128 struct ip_sf_list *psf, *psf_next; 1129 1130 spin_lock_bh(&pmc->lock); 1131 psf = pmc->tomb; 1132 pmc->tomb = NULL; 1133 spin_unlock_bh(&pmc->lock); 1134 for (; psf; psf=psf_next) { 1135 psf_next = psf->sf_next; 1136 kfree(psf); 1137 } 1138 } 1139 rcu_read_unlock(); 1140 } 1141 #endif 1142 1143 static void igmp_group_dropped(struct ip_mc_list *im) 1144 { 1145 struct in_device *in_dev = im->interface; 1146 #ifdef CONFIG_IP_MULTICAST 1147 int reporter; 1148 #endif 1149 1150 if (im->loaded) { 1151 im->loaded = 0; 1152 ip_mc_filter_del(in_dev, im->multiaddr); 1153 } 1154 1155 #ifdef CONFIG_IP_MULTICAST 1156 if (im->multiaddr == IGMP_ALL_HOSTS) 1157 return; 1158 1159 reporter = im->reporter; 1160 igmp_stop_timer(im); 1161 1162 if (!in_dev->dead) { 1163 if (IGMP_V1_SEEN(in_dev)) 1164 return; 1165 if (IGMP_V2_SEEN(in_dev)) { 1166 if (reporter) 1167 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1168 return; 1169 } 1170 /* IGMPv3 */ 1171 igmpv3_add_delrec(in_dev, im); 1172 1173 igmp_ifc_event(in_dev); 1174 } 1175 #endif 1176 } 1177 1178 static void igmp_group_added(struct ip_mc_list *im) 1179 { 1180 struct in_device *in_dev = im->interface; 1181 1182 if (im->loaded == 0) { 1183 im->loaded = 1; 1184 ip_mc_filter_add(in_dev, im->multiaddr); 1185 } 1186 1187 #ifdef CONFIG_IP_MULTICAST 1188 if (im->multiaddr == IGMP_ALL_HOSTS) 1189 return; 1190 1191 if (in_dev->dead) 1192 return; 1193 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1194 spin_lock_bh(&im->lock); 1195 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1196 spin_unlock_bh(&im->lock); 1197 return; 1198 } 1199 /* else, v3 */ 1200 1201 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1202 IGMP_Unsolicited_Report_Count; 1203 igmp_ifc_event(in_dev); 1204 #endif 1205 } 1206 1207 1208 /* 1209 * Multicast list managers 1210 */ 1211 1212 1213 /* 1214 * A socket has joined a multicast group on device dev. 1215 */ 1216 1217 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1218 { 1219 struct ip_mc_list *im; 1220 1221 ASSERT_RTNL(); 1222 1223 for_each_pmc_rtnl(in_dev, im) { 1224 if (im->multiaddr == addr) { 1225 im->users++; 1226 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1227 goto out; 1228 } 1229 } 1230 1231 im = kzalloc(sizeof(*im), GFP_KERNEL); 1232 if (!im) 1233 goto out; 1234 1235 im->users = 1; 1236 im->interface = in_dev; 1237 in_dev_hold(in_dev); 1238 im->multiaddr = addr; 1239 /* initial mode is (EX, empty) */ 1240 im->sfmode = MCAST_EXCLUDE; 1241 im->sfcount[MCAST_EXCLUDE] = 1; 1242 atomic_set(&im->refcnt, 1); 1243 spin_lock_init(&im->lock); 1244 #ifdef CONFIG_IP_MULTICAST 1245 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1246 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1247 #endif 1248 1249 im->next_rcu = in_dev->mc_list; 1250 in_dev->mc_count++; 1251 rcu_assign_pointer(in_dev->mc_list, im); 1252 1253 #ifdef CONFIG_IP_MULTICAST 1254 igmpv3_del_delrec(in_dev, im->multiaddr); 1255 #endif 1256 igmp_group_added(im); 1257 if (!in_dev->dead) 1258 ip_rt_multicast_event(in_dev); 1259 out: 1260 return; 1261 } 1262 EXPORT_SYMBOL(ip_mc_inc_group); 1263 1264 /* 1265 * Resend IGMP JOIN report; used for bonding. 1266 * Called with rcu_read_lock() 1267 */ 1268 void ip_mc_rejoin_groups(struct in_device *in_dev) 1269 { 1270 #ifdef CONFIG_IP_MULTICAST 1271 struct ip_mc_list *im; 1272 int type; 1273 1274 for_each_pmc_rcu(in_dev, im) { 1275 if (im->multiaddr == IGMP_ALL_HOSTS) 1276 continue; 1277 1278 /* a failover is happening and switches 1279 * must be notified immediately 1280 */ 1281 if (IGMP_V1_SEEN(in_dev)) 1282 type = IGMP_HOST_MEMBERSHIP_REPORT; 1283 else if (IGMP_V2_SEEN(in_dev)) 1284 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1285 else 1286 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1287 igmp_send_report(in_dev, im, type); 1288 } 1289 #endif 1290 } 1291 EXPORT_SYMBOL(ip_mc_rejoin_groups); 1292 1293 /* 1294 * A socket has left a multicast group on device dev 1295 */ 1296 1297 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1298 { 1299 struct ip_mc_list *i; 1300 struct ip_mc_list __rcu **ip; 1301 1302 ASSERT_RTNL(); 1303 1304 for (ip = &in_dev->mc_list; 1305 (i = rtnl_dereference(*ip)) != NULL; 1306 ip = &i->next_rcu) { 1307 if (i->multiaddr == addr) { 1308 if (--i->users == 0) { 1309 *ip = i->next_rcu; 1310 in_dev->mc_count--; 1311 igmp_group_dropped(i); 1312 ip_mc_clear_src(i); 1313 1314 if (!in_dev->dead) 1315 ip_rt_multicast_event(in_dev); 1316 1317 ip_ma_put(i); 1318 return; 1319 } 1320 break; 1321 } 1322 } 1323 } 1324 EXPORT_SYMBOL(ip_mc_dec_group); 1325 1326 /* Device changing type */ 1327 1328 void ip_mc_unmap(struct in_device *in_dev) 1329 { 1330 struct ip_mc_list *pmc; 1331 1332 ASSERT_RTNL(); 1333 1334 for_each_pmc_rtnl(in_dev, pmc) 1335 igmp_group_dropped(pmc); 1336 } 1337 1338 void ip_mc_remap(struct in_device *in_dev) 1339 { 1340 struct ip_mc_list *pmc; 1341 1342 ASSERT_RTNL(); 1343 1344 for_each_pmc_rtnl(in_dev, pmc) 1345 igmp_group_added(pmc); 1346 } 1347 1348 /* Device going down */ 1349 1350 void ip_mc_down(struct in_device *in_dev) 1351 { 1352 struct ip_mc_list *pmc; 1353 1354 ASSERT_RTNL(); 1355 1356 for_each_pmc_rtnl(in_dev, pmc) 1357 igmp_group_dropped(pmc); 1358 1359 #ifdef CONFIG_IP_MULTICAST 1360 in_dev->mr_ifc_count = 0; 1361 if (del_timer(&in_dev->mr_ifc_timer)) 1362 __in_dev_put(in_dev); 1363 in_dev->mr_gq_running = 0; 1364 if (del_timer(&in_dev->mr_gq_timer)) 1365 __in_dev_put(in_dev); 1366 igmpv3_clear_delrec(in_dev); 1367 #endif 1368 1369 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1370 } 1371 1372 void ip_mc_init_dev(struct in_device *in_dev) 1373 { 1374 ASSERT_RTNL(); 1375 1376 in_dev->mc_tomb = NULL; 1377 #ifdef CONFIG_IP_MULTICAST 1378 in_dev->mr_gq_running = 0; 1379 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1380 (unsigned long)in_dev); 1381 in_dev->mr_ifc_count = 0; 1382 in_dev->mc_count = 0; 1383 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1384 (unsigned long)in_dev); 1385 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1386 #endif 1387 1388 spin_lock_init(&in_dev->mc_tomb_lock); 1389 } 1390 1391 /* Device going up */ 1392 1393 void ip_mc_up(struct in_device *in_dev) 1394 { 1395 struct ip_mc_list *pmc; 1396 1397 ASSERT_RTNL(); 1398 1399 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1400 1401 for_each_pmc_rtnl(in_dev, pmc) 1402 igmp_group_added(pmc); 1403 } 1404 1405 /* 1406 * Device is about to be destroyed: clean up. 1407 */ 1408 1409 void ip_mc_destroy_dev(struct in_device *in_dev) 1410 { 1411 struct ip_mc_list *i; 1412 1413 ASSERT_RTNL(); 1414 1415 /* Deactivate timers */ 1416 ip_mc_down(in_dev); 1417 1418 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1419 in_dev->mc_list = i->next_rcu; 1420 in_dev->mc_count--; 1421 1422 /* We've dropped the groups in ip_mc_down already */ 1423 ip_mc_clear_src(i); 1424 ip_ma_put(i); 1425 } 1426 } 1427 1428 /* RTNL is locked */ 1429 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1430 { 1431 struct net_device *dev = NULL; 1432 struct in_device *idev = NULL; 1433 1434 if (imr->imr_ifindex) { 1435 idev = inetdev_by_index(net, imr->imr_ifindex); 1436 return idev; 1437 } 1438 if (imr->imr_address.s_addr) { 1439 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1440 if (!dev) 1441 return NULL; 1442 } 1443 1444 if (!dev) { 1445 struct rtable *rt = ip_route_output(net, 1446 imr->imr_multiaddr.s_addr, 1447 0, 0, 0); 1448 if (!IS_ERR(rt)) { 1449 dev = rt->dst.dev; 1450 ip_rt_put(rt); 1451 } 1452 } 1453 if (dev) { 1454 imr->imr_ifindex = dev->ifindex; 1455 idev = __in_dev_get_rtnl(dev); 1456 } 1457 return idev; 1458 } 1459 1460 /* 1461 * Join a socket to a group 1462 */ 1463 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1464 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1465 1466 1467 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1468 __be32 *psfsrc) 1469 { 1470 struct ip_sf_list *psf, *psf_prev; 1471 int rv = 0; 1472 1473 psf_prev = NULL; 1474 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1475 if (psf->sf_inaddr == *psfsrc) 1476 break; 1477 psf_prev = psf; 1478 } 1479 if (!psf || psf->sf_count[sfmode] == 0) { 1480 /* source filter not found, or count wrong => bug */ 1481 return -ESRCH; 1482 } 1483 psf->sf_count[sfmode]--; 1484 if (psf->sf_count[sfmode] == 0) { 1485 ip_rt_multicast_event(pmc->interface); 1486 } 1487 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1488 #ifdef CONFIG_IP_MULTICAST 1489 struct in_device *in_dev = pmc->interface; 1490 #endif 1491 1492 /* no more filters for this source */ 1493 if (psf_prev) 1494 psf_prev->sf_next = psf->sf_next; 1495 else 1496 pmc->sources = psf->sf_next; 1497 #ifdef CONFIG_IP_MULTICAST 1498 if (psf->sf_oldin && 1499 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1500 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1501 IGMP_Unsolicited_Report_Count; 1502 psf->sf_next = pmc->tomb; 1503 pmc->tomb = psf; 1504 rv = 1; 1505 } else 1506 #endif 1507 kfree(psf); 1508 } 1509 return rv; 1510 } 1511 1512 #ifndef CONFIG_IP_MULTICAST 1513 #define igmp_ifc_event(x) do { } while (0) 1514 #endif 1515 1516 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1517 int sfcount, __be32 *psfsrc, int delta) 1518 { 1519 struct ip_mc_list *pmc; 1520 int changerec = 0; 1521 int i, err; 1522 1523 if (!in_dev) 1524 return -ENODEV; 1525 rcu_read_lock(); 1526 for_each_pmc_rcu(in_dev, pmc) { 1527 if (*pmca == pmc->multiaddr) 1528 break; 1529 } 1530 if (!pmc) { 1531 /* MCA not found?? bug */ 1532 rcu_read_unlock(); 1533 return -ESRCH; 1534 } 1535 spin_lock_bh(&pmc->lock); 1536 rcu_read_unlock(); 1537 #ifdef CONFIG_IP_MULTICAST 1538 sf_markstate(pmc); 1539 #endif 1540 if (!delta) { 1541 err = -EINVAL; 1542 if (!pmc->sfcount[sfmode]) 1543 goto out_unlock; 1544 pmc->sfcount[sfmode]--; 1545 } 1546 err = 0; 1547 for (i=0; i<sfcount; i++) { 1548 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1549 1550 changerec |= rv > 0; 1551 if (!err && rv < 0) 1552 err = rv; 1553 } 1554 if (pmc->sfmode == MCAST_EXCLUDE && 1555 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1556 pmc->sfcount[MCAST_INCLUDE]) { 1557 #ifdef CONFIG_IP_MULTICAST 1558 struct ip_sf_list *psf; 1559 #endif 1560 1561 /* filter mode change */ 1562 pmc->sfmode = MCAST_INCLUDE; 1563 #ifdef CONFIG_IP_MULTICAST 1564 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1565 IGMP_Unsolicited_Report_Count; 1566 in_dev->mr_ifc_count = pmc->crcount; 1567 for (psf=pmc->sources; psf; psf = psf->sf_next) 1568 psf->sf_crcount = 0; 1569 igmp_ifc_event(pmc->interface); 1570 } else if (sf_setstate(pmc) || changerec) { 1571 igmp_ifc_event(pmc->interface); 1572 #endif 1573 } 1574 out_unlock: 1575 spin_unlock_bh(&pmc->lock); 1576 return err; 1577 } 1578 1579 /* 1580 * Add multicast single-source filter to the interface list 1581 */ 1582 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1583 __be32 *psfsrc) 1584 { 1585 struct ip_sf_list *psf, *psf_prev; 1586 1587 psf_prev = NULL; 1588 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1589 if (psf->sf_inaddr == *psfsrc) 1590 break; 1591 psf_prev = psf; 1592 } 1593 if (!psf) { 1594 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1595 if (!psf) 1596 return -ENOBUFS; 1597 psf->sf_inaddr = *psfsrc; 1598 if (psf_prev) { 1599 psf_prev->sf_next = psf; 1600 } else 1601 pmc->sources = psf; 1602 } 1603 psf->sf_count[sfmode]++; 1604 if (psf->sf_count[sfmode] == 1) { 1605 ip_rt_multicast_event(pmc->interface); 1606 } 1607 return 0; 1608 } 1609 1610 #ifdef CONFIG_IP_MULTICAST 1611 static void sf_markstate(struct ip_mc_list *pmc) 1612 { 1613 struct ip_sf_list *psf; 1614 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1615 1616 for (psf=pmc->sources; psf; psf=psf->sf_next) 1617 if (pmc->sfcount[MCAST_EXCLUDE]) { 1618 psf->sf_oldin = mca_xcount == 1619 psf->sf_count[MCAST_EXCLUDE] && 1620 !psf->sf_count[MCAST_INCLUDE]; 1621 } else 1622 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1623 } 1624 1625 static int sf_setstate(struct ip_mc_list *pmc) 1626 { 1627 struct ip_sf_list *psf, *dpsf; 1628 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1629 int qrv = pmc->interface->mr_qrv; 1630 int new_in, rv; 1631 1632 rv = 0; 1633 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1634 if (pmc->sfcount[MCAST_EXCLUDE]) { 1635 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1636 !psf->sf_count[MCAST_INCLUDE]; 1637 } else 1638 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1639 if (new_in) { 1640 if (!psf->sf_oldin) { 1641 struct ip_sf_list *prev = NULL; 1642 1643 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1644 if (dpsf->sf_inaddr == psf->sf_inaddr) 1645 break; 1646 prev = dpsf; 1647 } 1648 if (dpsf) { 1649 if (prev) 1650 prev->sf_next = dpsf->sf_next; 1651 else 1652 pmc->tomb = dpsf->sf_next; 1653 kfree(dpsf); 1654 } 1655 psf->sf_crcount = qrv; 1656 rv++; 1657 } 1658 } else if (psf->sf_oldin) { 1659 1660 psf->sf_crcount = 0; 1661 /* 1662 * add or update "delete" records if an active filter 1663 * is now inactive 1664 */ 1665 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1666 if (dpsf->sf_inaddr == psf->sf_inaddr) 1667 break; 1668 if (!dpsf) { 1669 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1670 if (!dpsf) 1671 continue; 1672 *dpsf = *psf; 1673 /* pmc->lock held by callers */ 1674 dpsf->sf_next = pmc->tomb; 1675 pmc->tomb = dpsf; 1676 } 1677 dpsf->sf_crcount = qrv; 1678 rv++; 1679 } 1680 } 1681 return rv; 1682 } 1683 #endif 1684 1685 /* 1686 * Add multicast source filter list to the interface list 1687 */ 1688 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1689 int sfcount, __be32 *psfsrc, int delta) 1690 { 1691 struct ip_mc_list *pmc; 1692 int isexclude; 1693 int i, err; 1694 1695 if (!in_dev) 1696 return -ENODEV; 1697 rcu_read_lock(); 1698 for_each_pmc_rcu(in_dev, pmc) { 1699 if (*pmca == pmc->multiaddr) 1700 break; 1701 } 1702 if (!pmc) { 1703 /* MCA not found?? bug */ 1704 rcu_read_unlock(); 1705 return -ESRCH; 1706 } 1707 spin_lock_bh(&pmc->lock); 1708 rcu_read_unlock(); 1709 1710 #ifdef CONFIG_IP_MULTICAST 1711 sf_markstate(pmc); 1712 #endif 1713 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1714 if (!delta) 1715 pmc->sfcount[sfmode]++; 1716 err = 0; 1717 for (i=0; i<sfcount; i++) { 1718 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1719 if (err) 1720 break; 1721 } 1722 if (err) { 1723 int j; 1724 1725 if (!delta) 1726 pmc->sfcount[sfmode]--; 1727 for (j=0; j<i; j++) 1728 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1729 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1730 #ifdef CONFIG_IP_MULTICAST 1731 struct ip_sf_list *psf; 1732 in_dev = pmc->interface; 1733 #endif 1734 1735 /* filter mode change */ 1736 if (pmc->sfcount[MCAST_EXCLUDE]) 1737 pmc->sfmode = MCAST_EXCLUDE; 1738 else if (pmc->sfcount[MCAST_INCLUDE]) 1739 pmc->sfmode = MCAST_INCLUDE; 1740 #ifdef CONFIG_IP_MULTICAST 1741 /* else no filters; keep old mode for reports */ 1742 1743 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1744 IGMP_Unsolicited_Report_Count; 1745 in_dev->mr_ifc_count = pmc->crcount; 1746 for (psf=pmc->sources; psf; psf = psf->sf_next) 1747 psf->sf_crcount = 0; 1748 igmp_ifc_event(in_dev); 1749 } else if (sf_setstate(pmc)) { 1750 igmp_ifc_event(in_dev); 1751 #endif 1752 } 1753 spin_unlock_bh(&pmc->lock); 1754 return err; 1755 } 1756 1757 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1758 { 1759 struct ip_sf_list *psf, *nextpsf; 1760 1761 for (psf=pmc->tomb; psf; psf=nextpsf) { 1762 nextpsf = psf->sf_next; 1763 kfree(psf); 1764 } 1765 pmc->tomb = NULL; 1766 for (psf=pmc->sources; psf; psf=nextpsf) { 1767 nextpsf = psf->sf_next; 1768 kfree(psf); 1769 } 1770 pmc->sources = NULL; 1771 pmc->sfmode = MCAST_EXCLUDE; 1772 pmc->sfcount[MCAST_INCLUDE] = 0; 1773 pmc->sfcount[MCAST_EXCLUDE] = 1; 1774 } 1775 1776 1777 /* 1778 * Join a multicast group 1779 */ 1780 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1781 { 1782 int err; 1783 __be32 addr = imr->imr_multiaddr.s_addr; 1784 struct ip_mc_socklist *iml = NULL, *i; 1785 struct in_device *in_dev; 1786 struct inet_sock *inet = inet_sk(sk); 1787 struct net *net = sock_net(sk); 1788 int ifindex; 1789 int count = 0; 1790 1791 if (!ipv4_is_multicast(addr)) 1792 return -EINVAL; 1793 1794 rtnl_lock(); 1795 1796 in_dev = ip_mc_find_dev(net, imr); 1797 1798 if (!in_dev) { 1799 iml = NULL; 1800 err = -ENODEV; 1801 goto done; 1802 } 1803 1804 err = -EADDRINUSE; 1805 ifindex = imr->imr_ifindex; 1806 for_each_pmc_rtnl(inet, i) { 1807 if (i->multi.imr_multiaddr.s_addr == addr && 1808 i->multi.imr_ifindex == ifindex) 1809 goto done; 1810 count++; 1811 } 1812 err = -ENOBUFS; 1813 if (count >= sysctl_igmp_max_memberships) 1814 goto done; 1815 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1816 if (iml == NULL) 1817 goto done; 1818 1819 memcpy(&iml->multi, imr, sizeof(*imr)); 1820 iml->next_rcu = inet->mc_list; 1821 iml->sflist = NULL; 1822 iml->sfmode = MCAST_EXCLUDE; 1823 rcu_assign_pointer(inet->mc_list, iml); 1824 ip_mc_inc_group(in_dev, addr); 1825 err = 0; 1826 done: 1827 rtnl_unlock(); 1828 return err; 1829 } 1830 EXPORT_SYMBOL(ip_mc_join_group); 1831 1832 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1833 struct in_device *in_dev) 1834 { 1835 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1836 int err; 1837 1838 if (psf == NULL) { 1839 /* any-source empty exclude case */ 1840 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1841 iml->sfmode, 0, NULL, 0); 1842 } 1843 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1844 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1845 RCU_INIT_POINTER(iml->sflist, NULL); 1846 /* decrease mem now to avoid the memleak warning */ 1847 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1848 kfree_rcu(psf, rcu); 1849 return err; 1850 } 1851 1852 /* 1853 * Ask a socket to leave a group. 1854 */ 1855 1856 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1857 { 1858 struct inet_sock *inet = inet_sk(sk); 1859 struct ip_mc_socklist *iml; 1860 struct ip_mc_socklist __rcu **imlp; 1861 struct in_device *in_dev; 1862 struct net *net = sock_net(sk); 1863 __be32 group = imr->imr_multiaddr.s_addr; 1864 u32 ifindex; 1865 int ret = -EADDRNOTAVAIL; 1866 1867 rtnl_lock(); 1868 in_dev = ip_mc_find_dev(net, imr); 1869 ifindex = imr->imr_ifindex; 1870 for (imlp = &inet->mc_list; 1871 (iml = rtnl_dereference(*imlp)) != NULL; 1872 imlp = &iml->next_rcu) { 1873 if (iml->multi.imr_multiaddr.s_addr != group) 1874 continue; 1875 if (ifindex) { 1876 if (iml->multi.imr_ifindex != ifindex) 1877 continue; 1878 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1879 iml->multi.imr_address.s_addr) 1880 continue; 1881 1882 (void) ip_mc_leave_src(sk, iml, in_dev); 1883 1884 *imlp = iml->next_rcu; 1885 1886 if (in_dev) 1887 ip_mc_dec_group(in_dev, group); 1888 rtnl_unlock(); 1889 /* decrease mem now to avoid the memleak warning */ 1890 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1891 kfree_rcu(iml, rcu); 1892 return 0; 1893 } 1894 if (!in_dev) 1895 ret = -ENODEV; 1896 rtnl_unlock(); 1897 return ret; 1898 } 1899 1900 int ip_mc_source(int add, int omode, struct sock *sk, struct 1901 ip_mreq_source *mreqs, int ifindex) 1902 { 1903 int err; 1904 struct ip_mreqn imr; 1905 __be32 addr = mreqs->imr_multiaddr; 1906 struct ip_mc_socklist *pmc; 1907 struct in_device *in_dev = NULL; 1908 struct inet_sock *inet = inet_sk(sk); 1909 struct ip_sf_socklist *psl; 1910 struct net *net = sock_net(sk); 1911 int leavegroup = 0; 1912 int i, j, rv; 1913 1914 if (!ipv4_is_multicast(addr)) 1915 return -EINVAL; 1916 1917 rtnl_lock(); 1918 1919 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1920 imr.imr_address.s_addr = mreqs->imr_interface; 1921 imr.imr_ifindex = ifindex; 1922 in_dev = ip_mc_find_dev(net, &imr); 1923 1924 if (!in_dev) { 1925 err = -ENODEV; 1926 goto done; 1927 } 1928 err = -EADDRNOTAVAIL; 1929 1930 for_each_pmc_rtnl(inet, pmc) { 1931 if ((pmc->multi.imr_multiaddr.s_addr == 1932 imr.imr_multiaddr.s_addr) && 1933 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1934 break; 1935 } 1936 if (!pmc) { /* must have a prior join */ 1937 err = -EINVAL; 1938 goto done; 1939 } 1940 /* if a source filter was set, must be the same mode as before */ 1941 if (pmc->sflist) { 1942 if (pmc->sfmode != omode) { 1943 err = -EINVAL; 1944 goto done; 1945 } 1946 } else if (pmc->sfmode != omode) { 1947 /* allow mode switches for empty-set filters */ 1948 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1949 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1950 NULL, 0); 1951 pmc->sfmode = omode; 1952 } 1953 1954 psl = rtnl_dereference(pmc->sflist); 1955 if (!add) { 1956 if (!psl) 1957 goto done; /* err = -EADDRNOTAVAIL */ 1958 rv = !0; 1959 for (i=0; i<psl->sl_count; i++) { 1960 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1961 sizeof(__be32)); 1962 if (rv == 0) 1963 break; 1964 } 1965 if (rv) /* source not found */ 1966 goto done; /* err = -EADDRNOTAVAIL */ 1967 1968 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1969 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1970 leavegroup = 1; 1971 goto done; 1972 } 1973 1974 /* update the interface filter */ 1975 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1976 &mreqs->imr_sourceaddr, 1); 1977 1978 for (j=i+1; j<psl->sl_count; j++) 1979 psl->sl_addr[j-1] = psl->sl_addr[j]; 1980 psl->sl_count--; 1981 err = 0; 1982 goto done; 1983 } 1984 /* else, add a new source to the filter */ 1985 1986 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1987 err = -ENOBUFS; 1988 goto done; 1989 } 1990 if (!psl || psl->sl_count == psl->sl_max) { 1991 struct ip_sf_socklist *newpsl; 1992 int count = IP_SFBLOCK; 1993 1994 if (psl) 1995 count += psl->sl_max; 1996 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1997 if (!newpsl) { 1998 err = -ENOBUFS; 1999 goto done; 2000 } 2001 newpsl->sl_max = count; 2002 newpsl->sl_count = count - IP_SFBLOCK; 2003 if (psl) { 2004 for (i=0; i<psl->sl_count; i++) 2005 newpsl->sl_addr[i] = psl->sl_addr[i]; 2006 /* decrease mem now to avoid the memleak warning */ 2007 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2008 kfree_rcu(psl, rcu); 2009 } 2010 rcu_assign_pointer(pmc->sflist, newpsl); 2011 psl = newpsl; 2012 } 2013 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2014 for (i=0; i<psl->sl_count; i++) { 2015 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2016 sizeof(__be32)); 2017 if (rv == 0) 2018 break; 2019 } 2020 if (rv == 0) /* address already there is an error */ 2021 goto done; 2022 for (j=psl->sl_count-1; j>=i; j--) 2023 psl->sl_addr[j+1] = psl->sl_addr[j]; 2024 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2025 psl->sl_count++; 2026 err = 0; 2027 /* update the interface list */ 2028 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2029 &mreqs->imr_sourceaddr, 1); 2030 done: 2031 rtnl_unlock(); 2032 if (leavegroup) 2033 return ip_mc_leave_group(sk, &imr); 2034 return err; 2035 } 2036 2037 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2038 { 2039 int err = 0; 2040 struct ip_mreqn imr; 2041 __be32 addr = msf->imsf_multiaddr; 2042 struct ip_mc_socklist *pmc; 2043 struct in_device *in_dev; 2044 struct inet_sock *inet = inet_sk(sk); 2045 struct ip_sf_socklist *newpsl, *psl; 2046 struct net *net = sock_net(sk); 2047 int leavegroup = 0; 2048 2049 if (!ipv4_is_multicast(addr)) 2050 return -EINVAL; 2051 if (msf->imsf_fmode != MCAST_INCLUDE && 2052 msf->imsf_fmode != MCAST_EXCLUDE) 2053 return -EINVAL; 2054 2055 rtnl_lock(); 2056 2057 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2058 imr.imr_address.s_addr = msf->imsf_interface; 2059 imr.imr_ifindex = ifindex; 2060 in_dev = ip_mc_find_dev(net, &imr); 2061 2062 if (!in_dev) { 2063 err = -ENODEV; 2064 goto done; 2065 } 2066 2067 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2068 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2069 leavegroup = 1; 2070 goto done; 2071 } 2072 2073 for_each_pmc_rtnl(inet, pmc) { 2074 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2075 pmc->multi.imr_ifindex == imr.imr_ifindex) 2076 break; 2077 } 2078 if (!pmc) { /* must have a prior join */ 2079 err = -EINVAL; 2080 goto done; 2081 } 2082 if (msf->imsf_numsrc) { 2083 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2084 GFP_KERNEL); 2085 if (!newpsl) { 2086 err = -ENOBUFS; 2087 goto done; 2088 } 2089 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2090 memcpy(newpsl->sl_addr, msf->imsf_slist, 2091 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2092 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2093 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2094 if (err) { 2095 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2096 goto done; 2097 } 2098 } else { 2099 newpsl = NULL; 2100 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2101 msf->imsf_fmode, 0, NULL, 0); 2102 } 2103 psl = rtnl_dereference(pmc->sflist); 2104 if (psl) { 2105 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2106 psl->sl_count, psl->sl_addr, 0); 2107 /* decrease mem now to avoid the memleak warning */ 2108 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2109 kfree_rcu(psl, rcu); 2110 } else 2111 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2112 0, NULL, 0); 2113 rcu_assign_pointer(pmc->sflist, newpsl); 2114 pmc->sfmode = msf->imsf_fmode; 2115 err = 0; 2116 done: 2117 rtnl_unlock(); 2118 if (leavegroup) 2119 err = ip_mc_leave_group(sk, &imr); 2120 return err; 2121 } 2122 2123 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2124 struct ip_msfilter __user *optval, int __user *optlen) 2125 { 2126 int err, len, count, copycount; 2127 struct ip_mreqn imr; 2128 __be32 addr = msf->imsf_multiaddr; 2129 struct ip_mc_socklist *pmc; 2130 struct in_device *in_dev; 2131 struct inet_sock *inet = inet_sk(sk); 2132 struct ip_sf_socklist *psl; 2133 struct net *net = sock_net(sk); 2134 2135 if (!ipv4_is_multicast(addr)) 2136 return -EINVAL; 2137 2138 rtnl_lock(); 2139 2140 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2141 imr.imr_address.s_addr = msf->imsf_interface; 2142 imr.imr_ifindex = 0; 2143 in_dev = ip_mc_find_dev(net, &imr); 2144 2145 if (!in_dev) { 2146 err = -ENODEV; 2147 goto done; 2148 } 2149 err = -EADDRNOTAVAIL; 2150 2151 for_each_pmc_rtnl(inet, pmc) { 2152 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2153 pmc->multi.imr_ifindex == imr.imr_ifindex) 2154 break; 2155 } 2156 if (!pmc) /* must have a prior join */ 2157 goto done; 2158 msf->imsf_fmode = pmc->sfmode; 2159 psl = rtnl_dereference(pmc->sflist); 2160 rtnl_unlock(); 2161 if (!psl) { 2162 len = 0; 2163 count = 0; 2164 } else { 2165 count = psl->sl_count; 2166 } 2167 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2168 len = copycount * sizeof(psl->sl_addr[0]); 2169 msf->imsf_numsrc = count; 2170 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2171 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2172 return -EFAULT; 2173 } 2174 if (len && 2175 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2176 return -EFAULT; 2177 return 0; 2178 done: 2179 rtnl_unlock(); 2180 return err; 2181 } 2182 2183 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2184 struct group_filter __user *optval, int __user *optlen) 2185 { 2186 int err, i, count, copycount; 2187 struct sockaddr_in *psin; 2188 __be32 addr; 2189 struct ip_mc_socklist *pmc; 2190 struct inet_sock *inet = inet_sk(sk); 2191 struct ip_sf_socklist *psl; 2192 2193 psin = (struct sockaddr_in *)&gsf->gf_group; 2194 if (psin->sin_family != AF_INET) 2195 return -EINVAL; 2196 addr = psin->sin_addr.s_addr; 2197 if (!ipv4_is_multicast(addr)) 2198 return -EINVAL; 2199 2200 rtnl_lock(); 2201 2202 err = -EADDRNOTAVAIL; 2203 2204 for_each_pmc_rtnl(inet, pmc) { 2205 if (pmc->multi.imr_multiaddr.s_addr == addr && 2206 pmc->multi.imr_ifindex == gsf->gf_interface) 2207 break; 2208 } 2209 if (!pmc) /* must have a prior join */ 2210 goto done; 2211 gsf->gf_fmode = pmc->sfmode; 2212 psl = rtnl_dereference(pmc->sflist); 2213 rtnl_unlock(); 2214 count = psl ? psl->sl_count : 0; 2215 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2216 gsf->gf_numsrc = count; 2217 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2218 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2219 return -EFAULT; 2220 } 2221 for (i=0; i<copycount; i++) { 2222 struct sockaddr_storage ss; 2223 2224 psin = (struct sockaddr_in *)&ss; 2225 memset(&ss, 0, sizeof(ss)); 2226 psin->sin_family = AF_INET; 2227 psin->sin_addr.s_addr = psl->sl_addr[i]; 2228 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2229 return -EFAULT; 2230 } 2231 return 0; 2232 done: 2233 rtnl_unlock(); 2234 return err; 2235 } 2236 2237 /* 2238 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2239 */ 2240 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2241 { 2242 struct inet_sock *inet = inet_sk(sk); 2243 struct ip_mc_socklist *pmc; 2244 struct ip_sf_socklist *psl; 2245 int i; 2246 int ret; 2247 2248 ret = 1; 2249 if (!ipv4_is_multicast(loc_addr)) 2250 goto out; 2251 2252 rcu_read_lock(); 2253 for_each_pmc_rcu(inet, pmc) { 2254 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2255 pmc->multi.imr_ifindex == dif) 2256 break; 2257 } 2258 ret = inet->mc_all; 2259 if (!pmc) 2260 goto unlock; 2261 psl = rcu_dereference(pmc->sflist); 2262 ret = (pmc->sfmode == MCAST_EXCLUDE); 2263 if (!psl) 2264 goto unlock; 2265 2266 for (i=0; i<psl->sl_count; i++) { 2267 if (psl->sl_addr[i] == rmt_addr) 2268 break; 2269 } 2270 ret = 0; 2271 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2272 goto unlock; 2273 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2274 goto unlock; 2275 ret = 1; 2276 unlock: 2277 rcu_read_unlock(); 2278 out: 2279 return ret; 2280 } 2281 2282 /* 2283 * A socket is closing. 2284 */ 2285 2286 void ip_mc_drop_socket(struct sock *sk) 2287 { 2288 struct inet_sock *inet = inet_sk(sk); 2289 struct ip_mc_socklist *iml; 2290 struct net *net = sock_net(sk); 2291 2292 if (inet->mc_list == NULL) 2293 return; 2294 2295 rtnl_lock(); 2296 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2297 struct in_device *in_dev; 2298 2299 inet->mc_list = iml->next_rcu; 2300 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2301 (void) ip_mc_leave_src(sk, iml, in_dev); 2302 if (in_dev != NULL) 2303 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2304 /* decrease mem now to avoid the memleak warning */ 2305 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2306 kfree_rcu(iml, rcu); 2307 } 2308 rtnl_unlock(); 2309 } 2310 2311 /* called with rcu_read_lock() */ 2312 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2313 { 2314 struct ip_mc_list *im; 2315 struct ip_sf_list *psf; 2316 int rv = 0; 2317 2318 for_each_pmc_rcu(in_dev, im) { 2319 if (im->multiaddr == mc_addr) 2320 break; 2321 } 2322 if (im && proto == IPPROTO_IGMP) { 2323 rv = 1; 2324 } else if (im) { 2325 if (src_addr) { 2326 for (psf=im->sources; psf; psf=psf->sf_next) { 2327 if (psf->sf_inaddr == src_addr) 2328 break; 2329 } 2330 if (psf) 2331 rv = psf->sf_count[MCAST_INCLUDE] || 2332 psf->sf_count[MCAST_EXCLUDE] != 2333 im->sfcount[MCAST_EXCLUDE]; 2334 else 2335 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2336 } else 2337 rv = 1; /* unspecified source; tentatively allow */ 2338 } 2339 return rv; 2340 } 2341 2342 #if defined(CONFIG_PROC_FS) 2343 struct igmp_mc_iter_state { 2344 struct seq_net_private p; 2345 struct net_device *dev; 2346 struct in_device *in_dev; 2347 }; 2348 2349 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2350 2351 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2352 { 2353 struct net *net = seq_file_net(seq); 2354 struct ip_mc_list *im = NULL; 2355 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2356 2357 state->in_dev = NULL; 2358 for_each_netdev_rcu(net, state->dev) { 2359 struct in_device *in_dev; 2360 2361 in_dev = __in_dev_get_rcu(state->dev); 2362 if (!in_dev) 2363 continue; 2364 im = rcu_dereference(in_dev->mc_list); 2365 if (im) { 2366 state->in_dev = in_dev; 2367 break; 2368 } 2369 } 2370 return im; 2371 } 2372 2373 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2374 { 2375 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2376 2377 im = rcu_dereference(im->next_rcu); 2378 while (!im) { 2379 state->dev = next_net_device_rcu(state->dev); 2380 if (!state->dev) { 2381 state->in_dev = NULL; 2382 break; 2383 } 2384 state->in_dev = __in_dev_get_rcu(state->dev); 2385 if (!state->in_dev) 2386 continue; 2387 im = rcu_dereference(state->in_dev->mc_list); 2388 } 2389 return im; 2390 } 2391 2392 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2393 { 2394 struct ip_mc_list *im = igmp_mc_get_first(seq); 2395 if (im) 2396 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2397 --pos; 2398 return pos ? NULL : im; 2399 } 2400 2401 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2402 __acquires(rcu) 2403 { 2404 rcu_read_lock(); 2405 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2406 } 2407 2408 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2409 { 2410 struct ip_mc_list *im; 2411 if (v == SEQ_START_TOKEN) 2412 im = igmp_mc_get_first(seq); 2413 else 2414 im = igmp_mc_get_next(seq, v); 2415 ++*pos; 2416 return im; 2417 } 2418 2419 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2420 __releases(rcu) 2421 { 2422 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2423 2424 state->in_dev = NULL; 2425 state->dev = NULL; 2426 rcu_read_unlock(); 2427 } 2428 2429 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2430 { 2431 if (v == SEQ_START_TOKEN) 2432 seq_puts(seq, 2433 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2434 else { 2435 struct ip_mc_list *im = (struct ip_mc_list *)v; 2436 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2437 char *querier; 2438 #ifdef CONFIG_IP_MULTICAST 2439 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2440 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2441 "V3"; 2442 #else 2443 querier = "NONE"; 2444 #endif 2445 2446 if (rcu_dereference(state->in_dev->mc_list) == im) { 2447 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2448 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2449 } 2450 2451 seq_printf(seq, 2452 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2453 im->multiaddr, im->users, 2454 im->tm_running, im->tm_running ? 2455 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2456 im->reporter); 2457 } 2458 return 0; 2459 } 2460 2461 static const struct seq_operations igmp_mc_seq_ops = { 2462 .start = igmp_mc_seq_start, 2463 .next = igmp_mc_seq_next, 2464 .stop = igmp_mc_seq_stop, 2465 .show = igmp_mc_seq_show, 2466 }; 2467 2468 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2469 { 2470 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2471 sizeof(struct igmp_mc_iter_state)); 2472 } 2473 2474 static const struct file_operations igmp_mc_seq_fops = { 2475 .owner = THIS_MODULE, 2476 .open = igmp_mc_seq_open, 2477 .read = seq_read, 2478 .llseek = seq_lseek, 2479 .release = seq_release_net, 2480 }; 2481 2482 struct igmp_mcf_iter_state { 2483 struct seq_net_private p; 2484 struct net_device *dev; 2485 struct in_device *idev; 2486 struct ip_mc_list *im; 2487 }; 2488 2489 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2490 2491 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2492 { 2493 struct net *net = seq_file_net(seq); 2494 struct ip_sf_list *psf = NULL; 2495 struct ip_mc_list *im = NULL; 2496 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2497 2498 state->idev = NULL; 2499 state->im = NULL; 2500 for_each_netdev_rcu(net, state->dev) { 2501 struct in_device *idev; 2502 idev = __in_dev_get_rcu(state->dev); 2503 if (unlikely(idev == NULL)) 2504 continue; 2505 im = rcu_dereference(idev->mc_list); 2506 if (likely(im != NULL)) { 2507 spin_lock_bh(&im->lock); 2508 psf = im->sources; 2509 if (likely(psf != NULL)) { 2510 state->im = im; 2511 state->idev = idev; 2512 break; 2513 } 2514 spin_unlock_bh(&im->lock); 2515 } 2516 } 2517 return psf; 2518 } 2519 2520 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2521 { 2522 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2523 2524 psf = psf->sf_next; 2525 while (!psf) { 2526 spin_unlock_bh(&state->im->lock); 2527 state->im = state->im->next; 2528 while (!state->im) { 2529 state->dev = next_net_device_rcu(state->dev); 2530 if (!state->dev) { 2531 state->idev = NULL; 2532 goto out; 2533 } 2534 state->idev = __in_dev_get_rcu(state->dev); 2535 if (!state->idev) 2536 continue; 2537 state->im = rcu_dereference(state->idev->mc_list); 2538 } 2539 if (!state->im) 2540 break; 2541 spin_lock_bh(&state->im->lock); 2542 psf = state->im->sources; 2543 } 2544 out: 2545 return psf; 2546 } 2547 2548 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2549 { 2550 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2551 if (psf) 2552 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2553 --pos; 2554 return pos ? NULL : psf; 2555 } 2556 2557 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2558 __acquires(rcu) 2559 { 2560 rcu_read_lock(); 2561 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2562 } 2563 2564 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2565 { 2566 struct ip_sf_list *psf; 2567 if (v == SEQ_START_TOKEN) 2568 psf = igmp_mcf_get_first(seq); 2569 else 2570 psf = igmp_mcf_get_next(seq, v); 2571 ++*pos; 2572 return psf; 2573 } 2574 2575 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2576 __releases(rcu) 2577 { 2578 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2579 if (likely(state->im != NULL)) { 2580 spin_unlock_bh(&state->im->lock); 2581 state->im = NULL; 2582 } 2583 state->idev = NULL; 2584 state->dev = NULL; 2585 rcu_read_unlock(); 2586 } 2587 2588 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2589 { 2590 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2591 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2592 2593 if (v == SEQ_START_TOKEN) { 2594 seq_printf(seq, 2595 "%3s %6s " 2596 "%10s %10s %6s %6s\n", "Idx", 2597 "Device", "MCA", 2598 "SRC", "INC", "EXC"); 2599 } else { 2600 seq_printf(seq, 2601 "%3d %6.6s 0x%08x " 2602 "0x%08x %6lu %6lu\n", 2603 state->dev->ifindex, state->dev->name, 2604 ntohl(state->im->multiaddr), 2605 ntohl(psf->sf_inaddr), 2606 psf->sf_count[MCAST_INCLUDE], 2607 psf->sf_count[MCAST_EXCLUDE]); 2608 } 2609 return 0; 2610 } 2611 2612 static const struct seq_operations igmp_mcf_seq_ops = { 2613 .start = igmp_mcf_seq_start, 2614 .next = igmp_mcf_seq_next, 2615 .stop = igmp_mcf_seq_stop, 2616 .show = igmp_mcf_seq_show, 2617 }; 2618 2619 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2620 { 2621 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2622 sizeof(struct igmp_mcf_iter_state)); 2623 } 2624 2625 static const struct file_operations igmp_mcf_seq_fops = { 2626 .owner = THIS_MODULE, 2627 .open = igmp_mcf_seq_open, 2628 .read = seq_read, 2629 .llseek = seq_lseek, 2630 .release = seq_release_net, 2631 }; 2632 2633 static int __net_init igmp_net_init(struct net *net) 2634 { 2635 struct proc_dir_entry *pde; 2636 2637 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2638 if (!pde) 2639 goto out_igmp; 2640 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2641 if (!pde) 2642 goto out_mcfilter; 2643 return 0; 2644 2645 out_mcfilter: 2646 proc_net_remove(net, "igmp"); 2647 out_igmp: 2648 return -ENOMEM; 2649 } 2650 2651 static void __net_exit igmp_net_exit(struct net *net) 2652 { 2653 proc_net_remove(net, "mcfilter"); 2654 proc_net_remove(net, "igmp"); 2655 } 2656 2657 static struct pernet_operations igmp_net_ops = { 2658 .init = igmp_net_init, 2659 .exit = igmp_net_exit, 2660 }; 2661 2662 int __init igmp_mc_proc_init(void) 2663 { 2664 return register_pernet_subsys(&igmp_net_ops); 2665 } 2666 #endif 2667