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 } else { /* v3 */ 884 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 885 return; 886 887 ih3 = igmpv3_query_hdr(skb); 888 if (ih3->nsrcs) { 889 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 890 + ntohs(ih3->nsrcs)*sizeof(__be32))) 891 return; 892 ih3 = igmpv3_query_hdr(skb); 893 } 894 895 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 896 if (!max_delay) 897 max_delay = 1; /* can't mod w/ 0 */ 898 in_dev->mr_maxdelay = max_delay; 899 if (ih3->qrv) 900 in_dev->mr_qrv = ih3->qrv; 901 if (!group) { /* general query */ 902 if (ih3->nsrcs) 903 return; /* no sources allowed */ 904 igmp_gq_start_timer(in_dev); 905 return; 906 } 907 /* mark sources to include, if group & source-specific */ 908 mark = ih3->nsrcs != 0; 909 } 910 911 /* 912 * - Start the timers in all of our membership records 913 * that the query applies to for the interface on 914 * which the query arrived excl. those that belong 915 * to a "local" group (224.0.0.X) 916 * - For timers already running check if they need to 917 * be reset. 918 * - Use the igmp->igmp_code field as the maximum 919 * delay possible 920 */ 921 rcu_read_lock(); 922 for_each_pmc_rcu(in_dev, im) { 923 int changed; 924 925 if (group && group != im->multiaddr) 926 continue; 927 if (im->multiaddr == IGMP_ALL_HOSTS) 928 continue; 929 spin_lock_bh(&im->lock); 930 if (im->tm_running) 931 im->gsquery = im->gsquery && mark; 932 else 933 im->gsquery = mark; 934 changed = !im->gsquery || 935 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 936 spin_unlock_bh(&im->lock); 937 if (changed) 938 igmp_mod_timer(im, max_delay); 939 } 940 rcu_read_unlock(); 941 } 942 943 /* called in rcu_read_lock() section */ 944 int igmp_rcv(struct sk_buff *skb) 945 { 946 /* This basically follows the spec line by line -- see RFC1112 */ 947 struct igmphdr *ih; 948 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 949 int len = skb->len; 950 951 if (in_dev == NULL) 952 goto drop; 953 954 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 955 goto drop; 956 957 switch (skb->ip_summed) { 958 case CHECKSUM_COMPLETE: 959 if (!csum_fold(skb->csum)) 960 break; 961 /* fall through */ 962 case CHECKSUM_NONE: 963 skb->csum = 0; 964 if (__skb_checksum_complete(skb)) 965 goto drop; 966 } 967 968 ih = igmp_hdr(skb); 969 switch (ih->type) { 970 case IGMP_HOST_MEMBERSHIP_QUERY: 971 igmp_heard_query(in_dev, skb, len); 972 break; 973 case IGMP_HOST_MEMBERSHIP_REPORT: 974 case IGMPV2_HOST_MEMBERSHIP_REPORT: 975 /* Is it our report looped back? */ 976 if (rt_is_output_route(skb_rtable(skb))) 977 break; 978 /* don't rely on MC router hearing unicast reports */ 979 if (skb->pkt_type == PACKET_MULTICAST || 980 skb->pkt_type == PACKET_BROADCAST) 981 igmp_heard_report(in_dev, ih->group); 982 break; 983 case IGMP_PIM: 984 #ifdef CONFIG_IP_PIMSM_V1 985 return pim_rcv_v1(skb); 986 #endif 987 case IGMPV3_HOST_MEMBERSHIP_REPORT: 988 case IGMP_DVMRP: 989 case IGMP_TRACE: 990 case IGMP_HOST_LEAVE_MESSAGE: 991 case IGMP_MTRACE: 992 case IGMP_MTRACE_RESP: 993 break; 994 default: 995 break; 996 } 997 998 drop: 999 kfree_skb(skb); 1000 return 0; 1001 } 1002 1003 #endif 1004 1005 1006 /* 1007 * Add a filter to a device 1008 */ 1009 1010 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 1011 { 1012 char buf[MAX_ADDR_LEN]; 1013 struct net_device *dev = in_dev->dev; 1014 1015 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1016 We will get multicast token leakage, when IFF_MULTICAST 1017 is changed. This check should be done in ndo_set_rx_mode 1018 routine. Something sort of: 1019 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1020 --ANK 1021 */ 1022 if (arp_mc_map(addr, buf, dev, 0) == 0) 1023 dev_mc_add(dev, buf); 1024 } 1025 1026 /* 1027 * Remove a filter from a device 1028 */ 1029 1030 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1031 { 1032 char buf[MAX_ADDR_LEN]; 1033 struct net_device *dev = in_dev->dev; 1034 1035 if (arp_mc_map(addr, buf, dev, 0) == 0) 1036 dev_mc_del(dev, buf); 1037 } 1038 1039 #ifdef CONFIG_IP_MULTICAST 1040 /* 1041 * deleted ip_mc_list manipulation 1042 */ 1043 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1044 { 1045 struct ip_mc_list *pmc; 1046 1047 /* this is an "ip_mc_list" for convenience; only the fields below 1048 * are actually used. In particular, the refcnt and users are not 1049 * used for management of the delete list. Using the same structure 1050 * for deleted items allows change reports to use common code with 1051 * non-deleted or query-response MCA's. 1052 */ 1053 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1054 if (!pmc) 1055 return; 1056 spin_lock_bh(&im->lock); 1057 pmc->interface = im->interface; 1058 in_dev_hold(in_dev); 1059 pmc->multiaddr = im->multiaddr; 1060 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1061 IGMP_Unsolicited_Report_Count; 1062 pmc->sfmode = im->sfmode; 1063 if (pmc->sfmode == MCAST_INCLUDE) { 1064 struct ip_sf_list *psf; 1065 1066 pmc->tomb = im->tomb; 1067 pmc->sources = im->sources; 1068 im->tomb = im->sources = NULL; 1069 for (psf=pmc->sources; psf; psf=psf->sf_next) 1070 psf->sf_crcount = pmc->crcount; 1071 } 1072 spin_unlock_bh(&im->lock); 1073 1074 spin_lock_bh(&in_dev->mc_tomb_lock); 1075 pmc->next = in_dev->mc_tomb; 1076 in_dev->mc_tomb = pmc; 1077 spin_unlock_bh(&in_dev->mc_tomb_lock); 1078 } 1079 1080 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1081 { 1082 struct ip_mc_list *pmc, *pmc_prev; 1083 struct ip_sf_list *psf, *psf_next; 1084 1085 spin_lock_bh(&in_dev->mc_tomb_lock); 1086 pmc_prev = NULL; 1087 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1088 if (pmc->multiaddr == multiaddr) 1089 break; 1090 pmc_prev = pmc; 1091 } 1092 if (pmc) { 1093 if (pmc_prev) 1094 pmc_prev->next = pmc->next; 1095 else 1096 in_dev->mc_tomb = pmc->next; 1097 } 1098 spin_unlock_bh(&in_dev->mc_tomb_lock); 1099 if (pmc) { 1100 for (psf=pmc->tomb; psf; psf=psf_next) { 1101 psf_next = psf->sf_next; 1102 kfree(psf); 1103 } 1104 in_dev_put(pmc->interface); 1105 kfree(pmc); 1106 } 1107 } 1108 1109 static void igmpv3_clear_delrec(struct in_device *in_dev) 1110 { 1111 struct ip_mc_list *pmc, *nextpmc; 1112 1113 spin_lock_bh(&in_dev->mc_tomb_lock); 1114 pmc = in_dev->mc_tomb; 1115 in_dev->mc_tomb = NULL; 1116 spin_unlock_bh(&in_dev->mc_tomb_lock); 1117 1118 for (; pmc; pmc = nextpmc) { 1119 nextpmc = pmc->next; 1120 ip_mc_clear_src(pmc); 1121 in_dev_put(pmc->interface); 1122 kfree(pmc); 1123 } 1124 /* clear dead sources, too */ 1125 rcu_read_lock(); 1126 for_each_pmc_rcu(in_dev, pmc) { 1127 struct ip_sf_list *psf, *psf_next; 1128 1129 spin_lock_bh(&pmc->lock); 1130 psf = pmc->tomb; 1131 pmc->tomb = NULL; 1132 spin_unlock_bh(&pmc->lock); 1133 for (; psf; psf=psf_next) { 1134 psf_next = psf->sf_next; 1135 kfree(psf); 1136 } 1137 } 1138 rcu_read_unlock(); 1139 } 1140 #endif 1141 1142 static void igmp_group_dropped(struct ip_mc_list *im) 1143 { 1144 struct in_device *in_dev = im->interface; 1145 #ifdef CONFIG_IP_MULTICAST 1146 int reporter; 1147 #endif 1148 1149 if (im->loaded) { 1150 im->loaded = 0; 1151 ip_mc_filter_del(in_dev, im->multiaddr); 1152 } 1153 1154 #ifdef CONFIG_IP_MULTICAST 1155 if (im->multiaddr == IGMP_ALL_HOSTS) 1156 return; 1157 1158 reporter = im->reporter; 1159 igmp_stop_timer(im); 1160 1161 if (!in_dev->dead) { 1162 if (IGMP_V1_SEEN(in_dev)) 1163 return; 1164 if (IGMP_V2_SEEN(in_dev)) { 1165 if (reporter) 1166 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1167 return; 1168 } 1169 /* IGMPv3 */ 1170 igmpv3_add_delrec(in_dev, im); 1171 1172 igmp_ifc_event(in_dev); 1173 } 1174 #endif 1175 } 1176 1177 static void igmp_group_added(struct ip_mc_list *im) 1178 { 1179 struct in_device *in_dev = im->interface; 1180 1181 if (im->loaded == 0) { 1182 im->loaded = 1; 1183 ip_mc_filter_add(in_dev, im->multiaddr); 1184 } 1185 1186 #ifdef CONFIG_IP_MULTICAST 1187 if (im->multiaddr == IGMP_ALL_HOSTS) 1188 return; 1189 1190 if (in_dev->dead) 1191 return; 1192 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1193 spin_lock_bh(&im->lock); 1194 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1195 spin_unlock_bh(&im->lock); 1196 return; 1197 } 1198 /* else, v3 */ 1199 1200 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1201 IGMP_Unsolicited_Report_Count; 1202 igmp_ifc_event(in_dev); 1203 #endif 1204 } 1205 1206 1207 /* 1208 * Multicast list managers 1209 */ 1210 1211 1212 /* 1213 * A socket has joined a multicast group on device dev. 1214 */ 1215 1216 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1217 { 1218 struct ip_mc_list *im; 1219 1220 ASSERT_RTNL(); 1221 1222 for_each_pmc_rtnl(in_dev, im) { 1223 if (im->multiaddr == addr) { 1224 im->users++; 1225 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1226 goto out; 1227 } 1228 } 1229 1230 im = kzalloc(sizeof(*im), GFP_KERNEL); 1231 if (!im) 1232 goto out; 1233 1234 im->users = 1; 1235 im->interface = in_dev; 1236 in_dev_hold(in_dev); 1237 im->multiaddr = addr; 1238 /* initial mode is (EX, empty) */ 1239 im->sfmode = MCAST_EXCLUDE; 1240 im->sfcount[MCAST_EXCLUDE] = 1; 1241 atomic_set(&im->refcnt, 1); 1242 spin_lock_init(&im->lock); 1243 #ifdef CONFIG_IP_MULTICAST 1244 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1245 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1246 #endif 1247 1248 im->next_rcu = in_dev->mc_list; 1249 in_dev->mc_count++; 1250 RCU_INIT_POINTER(in_dev->mc_list, im); 1251 1252 #ifdef CONFIG_IP_MULTICAST 1253 igmpv3_del_delrec(in_dev, im->multiaddr); 1254 #endif 1255 igmp_group_added(im); 1256 if (!in_dev->dead) 1257 ip_rt_multicast_event(in_dev); 1258 out: 1259 return; 1260 } 1261 EXPORT_SYMBOL(ip_mc_inc_group); 1262 1263 /* 1264 * Resend IGMP JOIN report; used for bonding. 1265 * Called with rcu_read_lock() 1266 */ 1267 void ip_mc_rejoin_groups(struct in_device *in_dev) 1268 { 1269 #ifdef CONFIG_IP_MULTICAST 1270 struct ip_mc_list *im; 1271 int type; 1272 1273 for_each_pmc_rcu(in_dev, im) { 1274 if (im->multiaddr == IGMP_ALL_HOSTS) 1275 continue; 1276 1277 /* a failover is happening and switches 1278 * must be notified immediately 1279 */ 1280 if (IGMP_V1_SEEN(in_dev)) 1281 type = IGMP_HOST_MEMBERSHIP_REPORT; 1282 else if (IGMP_V2_SEEN(in_dev)) 1283 type = IGMPV2_HOST_MEMBERSHIP_REPORT; 1284 else 1285 type = IGMPV3_HOST_MEMBERSHIP_REPORT; 1286 igmp_send_report(in_dev, im, type); 1287 } 1288 #endif 1289 } 1290 EXPORT_SYMBOL(ip_mc_rejoin_groups); 1291 1292 /* 1293 * A socket has left a multicast group on device dev 1294 */ 1295 1296 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1297 { 1298 struct ip_mc_list *i; 1299 struct ip_mc_list __rcu **ip; 1300 1301 ASSERT_RTNL(); 1302 1303 for (ip = &in_dev->mc_list; 1304 (i = rtnl_dereference(*ip)) != NULL; 1305 ip = &i->next_rcu) { 1306 if (i->multiaddr == addr) { 1307 if (--i->users == 0) { 1308 *ip = i->next_rcu; 1309 in_dev->mc_count--; 1310 igmp_group_dropped(i); 1311 ip_mc_clear_src(i); 1312 1313 if (!in_dev->dead) 1314 ip_rt_multicast_event(in_dev); 1315 1316 ip_ma_put(i); 1317 return; 1318 } 1319 break; 1320 } 1321 } 1322 } 1323 EXPORT_SYMBOL(ip_mc_dec_group); 1324 1325 /* Device changing type */ 1326 1327 void ip_mc_unmap(struct in_device *in_dev) 1328 { 1329 struct ip_mc_list *pmc; 1330 1331 ASSERT_RTNL(); 1332 1333 for_each_pmc_rtnl(in_dev, pmc) 1334 igmp_group_dropped(pmc); 1335 } 1336 1337 void ip_mc_remap(struct in_device *in_dev) 1338 { 1339 struct ip_mc_list *pmc; 1340 1341 ASSERT_RTNL(); 1342 1343 for_each_pmc_rtnl(in_dev, pmc) 1344 igmp_group_added(pmc); 1345 } 1346 1347 /* Device going down */ 1348 1349 void ip_mc_down(struct in_device *in_dev) 1350 { 1351 struct ip_mc_list *pmc; 1352 1353 ASSERT_RTNL(); 1354 1355 for_each_pmc_rtnl(in_dev, pmc) 1356 igmp_group_dropped(pmc); 1357 1358 #ifdef CONFIG_IP_MULTICAST 1359 in_dev->mr_ifc_count = 0; 1360 if (del_timer(&in_dev->mr_ifc_timer)) 1361 __in_dev_put(in_dev); 1362 in_dev->mr_gq_running = 0; 1363 if (del_timer(&in_dev->mr_gq_timer)) 1364 __in_dev_put(in_dev); 1365 igmpv3_clear_delrec(in_dev); 1366 #endif 1367 1368 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1369 } 1370 1371 void ip_mc_init_dev(struct in_device *in_dev) 1372 { 1373 ASSERT_RTNL(); 1374 1375 in_dev->mc_tomb = NULL; 1376 #ifdef CONFIG_IP_MULTICAST 1377 in_dev->mr_gq_running = 0; 1378 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1379 (unsigned long)in_dev); 1380 in_dev->mr_ifc_count = 0; 1381 in_dev->mc_count = 0; 1382 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1383 (unsigned long)in_dev); 1384 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1385 #endif 1386 1387 spin_lock_init(&in_dev->mc_tomb_lock); 1388 } 1389 1390 /* Device going up */ 1391 1392 void ip_mc_up(struct in_device *in_dev) 1393 { 1394 struct ip_mc_list *pmc; 1395 1396 ASSERT_RTNL(); 1397 1398 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1399 1400 for_each_pmc_rtnl(in_dev, pmc) 1401 igmp_group_added(pmc); 1402 } 1403 1404 /* 1405 * Device is about to be destroyed: clean up. 1406 */ 1407 1408 void ip_mc_destroy_dev(struct in_device *in_dev) 1409 { 1410 struct ip_mc_list *i; 1411 1412 ASSERT_RTNL(); 1413 1414 /* Deactivate timers */ 1415 ip_mc_down(in_dev); 1416 1417 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { 1418 in_dev->mc_list = i->next_rcu; 1419 in_dev->mc_count--; 1420 1421 /* We've dropped the groups in ip_mc_down already */ 1422 ip_mc_clear_src(i); 1423 ip_ma_put(i); 1424 } 1425 } 1426 1427 /* RTNL is locked */ 1428 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1429 { 1430 struct net_device *dev = NULL; 1431 struct in_device *idev = NULL; 1432 1433 if (imr->imr_ifindex) { 1434 idev = inetdev_by_index(net, imr->imr_ifindex); 1435 return idev; 1436 } 1437 if (imr->imr_address.s_addr) { 1438 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1439 if (!dev) 1440 return NULL; 1441 } 1442 1443 if (!dev) { 1444 struct rtable *rt = ip_route_output(net, 1445 imr->imr_multiaddr.s_addr, 1446 0, 0, 0); 1447 if (!IS_ERR(rt)) { 1448 dev = rt->dst.dev; 1449 ip_rt_put(rt); 1450 } 1451 } 1452 if (dev) { 1453 imr->imr_ifindex = dev->ifindex; 1454 idev = __in_dev_get_rtnl(dev); 1455 } 1456 return idev; 1457 } 1458 1459 /* 1460 * Join a socket to a group 1461 */ 1462 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1463 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1464 1465 1466 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1467 __be32 *psfsrc) 1468 { 1469 struct ip_sf_list *psf, *psf_prev; 1470 int rv = 0; 1471 1472 psf_prev = NULL; 1473 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1474 if (psf->sf_inaddr == *psfsrc) 1475 break; 1476 psf_prev = psf; 1477 } 1478 if (!psf || psf->sf_count[sfmode] == 0) { 1479 /* source filter not found, or count wrong => bug */ 1480 return -ESRCH; 1481 } 1482 psf->sf_count[sfmode]--; 1483 if (psf->sf_count[sfmode] == 0) { 1484 ip_rt_multicast_event(pmc->interface); 1485 } 1486 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1487 #ifdef CONFIG_IP_MULTICAST 1488 struct in_device *in_dev = pmc->interface; 1489 #endif 1490 1491 /* no more filters for this source */ 1492 if (psf_prev) 1493 psf_prev->sf_next = psf->sf_next; 1494 else 1495 pmc->sources = psf->sf_next; 1496 #ifdef CONFIG_IP_MULTICAST 1497 if (psf->sf_oldin && 1498 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1499 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1500 IGMP_Unsolicited_Report_Count; 1501 psf->sf_next = pmc->tomb; 1502 pmc->tomb = psf; 1503 rv = 1; 1504 } else 1505 #endif 1506 kfree(psf); 1507 } 1508 return rv; 1509 } 1510 1511 #ifndef CONFIG_IP_MULTICAST 1512 #define igmp_ifc_event(x) do { } while (0) 1513 #endif 1514 1515 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1516 int sfcount, __be32 *psfsrc, int delta) 1517 { 1518 struct ip_mc_list *pmc; 1519 int changerec = 0; 1520 int i, err; 1521 1522 if (!in_dev) 1523 return -ENODEV; 1524 rcu_read_lock(); 1525 for_each_pmc_rcu(in_dev, pmc) { 1526 if (*pmca == pmc->multiaddr) 1527 break; 1528 } 1529 if (!pmc) { 1530 /* MCA not found?? bug */ 1531 rcu_read_unlock(); 1532 return -ESRCH; 1533 } 1534 spin_lock_bh(&pmc->lock); 1535 rcu_read_unlock(); 1536 #ifdef CONFIG_IP_MULTICAST 1537 sf_markstate(pmc); 1538 #endif 1539 if (!delta) { 1540 err = -EINVAL; 1541 if (!pmc->sfcount[sfmode]) 1542 goto out_unlock; 1543 pmc->sfcount[sfmode]--; 1544 } 1545 err = 0; 1546 for (i=0; i<sfcount; i++) { 1547 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1548 1549 changerec |= rv > 0; 1550 if (!err && rv < 0) 1551 err = rv; 1552 } 1553 if (pmc->sfmode == MCAST_EXCLUDE && 1554 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1555 pmc->sfcount[MCAST_INCLUDE]) { 1556 #ifdef CONFIG_IP_MULTICAST 1557 struct ip_sf_list *psf; 1558 #endif 1559 1560 /* filter mode change */ 1561 pmc->sfmode = MCAST_INCLUDE; 1562 #ifdef CONFIG_IP_MULTICAST 1563 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1564 IGMP_Unsolicited_Report_Count; 1565 in_dev->mr_ifc_count = pmc->crcount; 1566 for (psf=pmc->sources; psf; psf = psf->sf_next) 1567 psf->sf_crcount = 0; 1568 igmp_ifc_event(pmc->interface); 1569 } else if (sf_setstate(pmc) || changerec) { 1570 igmp_ifc_event(pmc->interface); 1571 #endif 1572 } 1573 out_unlock: 1574 spin_unlock_bh(&pmc->lock); 1575 return err; 1576 } 1577 1578 /* 1579 * Add multicast single-source filter to the interface list 1580 */ 1581 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1582 __be32 *psfsrc) 1583 { 1584 struct ip_sf_list *psf, *psf_prev; 1585 1586 psf_prev = NULL; 1587 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1588 if (psf->sf_inaddr == *psfsrc) 1589 break; 1590 psf_prev = psf; 1591 } 1592 if (!psf) { 1593 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1594 if (!psf) 1595 return -ENOBUFS; 1596 psf->sf_inaddr = *psfsrc; 1597 if (psf_prev) { 1598 psf_prev->sf_next = psf; 1599 } else 1600 pmc->sources = psf; 1601 } 1602 psf->sf_count[sfmode]++; 1603 if (psf->sf_count[sfmode] == 1) { 1604 ip_rt_multicast_event(pmc->interface); 1605 } 1606 return 0; 1607 } 1608 1609 #ifdef CONFIG_IP_MULTICAST 1610 static void sf_markstate(struct ip_mc_list *pmc) 1611 { 1612 struct ip_sf_list *psf; 1613 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1614 1615 for (psf=pmc->sources; psf; psf=psf->sf_next) 1616 if (pmc->sfcount[MCAST_EXCLUDE]) { 1617 psf->sf_oldin = mca_xcount == 1618 psf->sf_count[MCAST_EXCLUDE] && 1619 !psf->sf_count[MCAST_INCLUDE]; 1620 } else 1621 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1622 } 1623 1624 static int sf_setstate(struct ip_mc_list *pmc) 1625 { 1626 struct ip_sf_list *psf, *dpsf; 1627 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1628 int qrv = pmc->interface->mr_qrv; 1629 int new_in, rv; 1630 1631 rv = 0; 1632 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1633 if (pmc->sfcount[MCAST_EXCLUDE]) { 1634 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1635 !psf->sf_count[MCAST_INCLUDE]; 1636 } else 1637 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1638 if (new_in) { 1639 if (!psf->sf_oldin) { 1640 struct ip_sf_list *prev = NULL; 1641 1642 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1643 if (dpsf->sf_inaddr == psf->sf_inaddr) 1644 break; 1645 prev = dpsf; 1646 } 1647 if (dpsf) { 1648 if (prev) 1649 prev->sf_next = dpsf->sf_next; 1650 else 1651 pmc->tomb = dpsf->sf_next; 1652 kfree(dpsf); 1653 } 1654 psf->sf_crcount = qrv; 1655 rv++; 1656 } 1657 } else if (psf->sf_oldin) { 1658 1659 psf->sf_crcount = 0; 1660 /* 1661 * add or update "delete" records if an active filter 1662 * is now inactive 1663 */ 1664 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1665 if (dpsf->sf_inaddr == psf->sf_inaddr) 1666 break; 1667 if (!dpsf) { 1668 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1669 if (!dpsf) 1670 continue; 1671 *dpsf = *psf; 1672 /* pmc->lock held by callers */ 1673 dpsf->sf_next = pmc->tomb; 1674 pmc->tomb = dpsf; 1675 } 1676 dpsf->sf_crcount = qrv; 1677 rv++; 1678 } 1679 } 1680 return rv; 1681 } 1682 #endif 1683 1684 /* 1685 * Add multicast source filter list to the interface list 1686 */ 1687 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1688 int sfcount, __be32 *psfsrc, int delta) 1689 { 1690 struct ip_mc_list *pmc; 1691 int isexclude; 1692 int i, err; 1693 1694 if (!in_dev) 1695 return -ENODEV; 1696 rcu_read_lock(); 1697 for_each_pmc_rcu(in_dev, pmc) { 1698 if (*pmca == pmc->multiaddr) 1699 break; 1700 } 1701 if (!pmc) { 1702 /* MCA not found?? bug */ 1703 rcu_read_unlock(); 1704 return -ESRCH; 1705 } 1706 spin_lock_bh(&pmc->lock); 1707 rcu_read_unlock(); 1708 1709 #ifdef CONFIG_IP_MULTICAST 1710 sf_markstate(pmc); 1711 #endif 1712 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1713 if (!delta) 1714 pmc->sfcount[sfmode]++; 1715 err = 0; 1716 for (i=0; i<sfcount; i++) { 1717 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); 1718 if (err) 1719 break; 1720 } 1721 if (err) { 1722 int j; 1723 1724 if (!delta) 1725 pmc->sfcount[sfmode]--; 1726 for (j=0; j<i; j++) 1727 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); 1728 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1729 #ifdef CONFIG_IP_MULTICAST 1730 struct ip_sf_list *psf; 1731 in_dev = pmc->interface; 1732 #endif 1733 1734 /* filter mode change */ 1735 if (pmc->sfcount[MCAST_EXCLUDE]) 1736 pmc->sfmode = MCAST_EXCLUDE; 1737 else if (pmc->sfcount[MCAST_INCLUDE]) 1738 pmc->sfmode = MCAST_INCLUDE; 1739 #ifdef CONFIG_IP_MULTICAST 1740 /* else no filters; keep old mode for reports */ 1741 1742 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1743 IGMP_Unsolicited_Report_Count; 1744 in_dev->mr_ifc_count = pmc->crcount; 1745 for (psf=pmc->sources; psf; psf = psf->sf_next) 1746 psf->sf_crcount = 0; 1747 igmp_ifc_event(in_dev); 1748 } else if (sf_setstate(pmc)) { 1749 igmp_ifc_event(in_dev); 1750 #endif 1751 } 1752 spin_unlock_bh(&pmc->lock); 1753 return err; 1754 } 1755 1756 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1757 { 1758 struct ip_sf_list *psf, *nextpsf; 1759 1760 for (psf=pmc->tomb; psf; psf=nextpsf) { 1761 nextpsf = psf->sf_next; 1762 kfree(psf); 1763 } 1764 pmc->tomb = NULL; 1765 for (psf=pmc->sources; psf; psf=nextpsf) { 1766 nextpsf = psf->sf_next; 1767 kfree(psf); 1768 } 1769 pmc->sources = NULL; 1770 pmc->sfmode = MCAST_EXCLUDE; 1771 pmc->sfcount[MCAST_INCLUDE] = 0; 1772 pmc->sfcount[MCAST_EXCLUDE] = 1; 1773 } 1774 1775 1776 /* 1777 * Join a multicast group 1778 */ 1779 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1780 { 1781 int err; 1782 __be32 addr = imr->imr_multiaddr.s_addr; 1783 struct ip_mc_socklist *iml = NULL, *i; 1784 struct in_device *in_dev; 1785 struct inet_sock *inet = inet_sk(sk); 1786 struct net *net = sock_net(sk); 1787 int ifindex; 1788 int count = 0; 1789 1790 if (!ipv4_is_multicast(addr)) 1791 return -EINVAL; 1792 1793 rtnl_lock(); 1794 1795 in_dev = ip_mc_find_dev(net, imr); 1796 1797 if (!in_dev) { 1798 iml = NULL; 1799 err = -ENODEV; 1800 goto done; 1801 } 1802 1803 err = -EADDRINUSE; 1804 ifindex = imr->imr_ifindex; 1805 for_each_pmc_rtnl(inet, i) { 1806 if (i->multi.imr_multiaddr.s_addr == addr && 1807 i->multi.imr_ifindex == ifindex) 1808 goto done; 1809 count++; 1810 } 1811 err = -ENOBUFS; 1812 if (count >= sysctl_igmp_max_memberships) 1813 goto done; 1814 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1815 if (iml == NULL) 1816 goto done; 1817 1818 memcpy(&iml->multi, imr, sizeof(*imr)); 1819 iml->next_rcu = inet->mc_list; 1820 iml->sflist = NULL; 1821 iml->sfmode = MCAST_EXCLUDE; 1822 RCU_INIT_POINTER(inet->mc_list, iml); 1823 ip_mc_inc_group(in_dev, addr); 1824 err = 0; 1825 done: 1826 rtnl_unlock(); 1827 return err; 1828 } 1829 EXPORT_SYMBOL(ip_mc_join_group); 1830 1831 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, 1832 struct in_device *in_dev) 1833 { 1834 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); 1835 int err; 1836 1837 if (psf == NULL) { 1838 /* any-source empty exclude case */ 1839 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1840 iml->sfmode, 0, NULL, 0); 1841 } 1842 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, 1843 iml->sfmode, psf->sl_count, psf->sl_addr, 0); 1844 RCU_INIT_POINTER(iml->sflist, NULL); 1845 /* decrease mem now to avoid the memleak warning */ 1846 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); 1847 kfree_rcu(psf, rcu); 1848 return err; 1849 } 1850 1851 /* 1852 * Ask a socket to leave a group. 1853 */ 1854 1855 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1856 { 1857 struct inet_sock *inet = inet_sk(sk); 1858 struct ip_mc_socklist *iml; 1859 struct ip_mc_socklist __rcu **imlp; 1860 struct in_device *in_dev; 1861 struct net *net = sock_net(sk); 1862 __be32 group = imr->imr_multiaddr.s_addr; 1863 u32 ifindex; 1864 int ret = -EADDRNOTAVAIL; 1865 1866 rtnl_lock(); 1867 in_dev = ip_mc_find_dev(net, imr); 1868 ifindex = imr->imr_ifindex; 1869 for (imlp = &inet->mc_list; 1870 (iml = rtnl_dereference(*imlp)) != NULL; 1871 imlp = &iml->next_rcu) { 1872 if (iml->multi.imr_multiaddr.s_addr != group) 1873 continue; 1874 if (ifindex) { 1875 if (iml->multi.imr_ifindex != ifindex) 1876 continue; 1877 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1878 iml->multi.imr_address.s_addr) 1879 continue; 1880 1881 (void) ip_mc_leave_src(sk, iml, in_dev); 1882 1883 *imlp = iml->next_rcu; 1884 1885 if (in_dev) 1886 ip_mc_dec_group(in_dev, group); 1887 rtnl_unlock(); 1888 /* decrease mem now to avoid the memleak warning */ 1889 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1890 kfree_rcu(iml, rcu); 1891 return 0; 1892 } 1893 if (!in_dev) 1894 ret = -ENODEV; 1895 rtnl_unlock(); 1896 return ret; 1897 } 1898 1899 int ip_mc_source(int add, int omode, struct sock *sk, struct 1900 ip_mreq_source *mreqs, int ifindex) 1901 { 1902 int err; 1903 struct ip_mreqn imr; 1904 __be32 addr = mreqs->imr_multiaddr; 1905 struct ip_mc_socklist *pmc; 1906 struct in_device *in_dev = NULL; 1907 struct inet_sock *inet = inet_sk(sk); 1908 struct ip_sf_socklist *psl; 1909 struct net *net = sock_net(sk); 1910 int leavegroup = 0; 1911 int i, j, rv; 1912 1913 if (!ipv4_is_multicast(addr)) 1914 return -EINVAL; 1915 1916 rtnl_lock(); 1917 1918 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1919 imr.imr_address.s_addr = mreqs->imr_interface; 1920 imr.imr_ifindex = ifindex; 1921 in_dev = ip_mc_find_dev(net, &imr); 1922 1923 if (!in_dev) { 1924 err = -ENODEV; 1925 goto done; 1926 } 1927 err = -EADDRNOTAVAIL; 1928 1929 for_each_pmc_rtnl(inet, pmc) { 1930 if ((pmc->multi.imr_multiaddr.s_addr == 1931 imr.imr_multiaddr.s_addr) && 1932 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1933 break; 1934 } 1935 if (!pmc) { /* must have a prior join */ 1936 err = -EINVAL; 1937 goto done; 1938 } 1939 /* if a source filter was set, must be the same mode as before */ 1940 if (pmc->sflist) { 1941 if (pmc->sfmode != omode) { 1942 err = -EINVAL; 1943 goto done; 1944 } 1945 } else if (pmc->sfmode != omode) { 1946 /* allow mode switches for empty-set filters */ 1947 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1948 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1949 NULL, 0); 1950 pmc->sfmode = omode; 1951 } 1952 1953 psl = rtnl_dereference(pmc->sflist); 1954 if (!add) { 1955 if (!psl) 1956 goto done; /* err = -EADDRNOTAVAIL */ 1957 rv = !0; 1958 for (i=0; i<psl->sl_count; i++) { 1959 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1960 sizeof(__be32)); 1961 if (rv == 0) 1962 break; 1963 } 1964 if (rv) /* source not found */ 1965 goto done; /* err = -EADDRNOTAVAIL */ 1966 1967 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1968 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1969 leavegroup = 1; 1970 goto done; 1971 } 1972 1973 /* update the interface filter */ 1974 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1975 &mreqs->imr_sourceaddr, 1); 1976 1977 for (j=i+1; j<psl->sl_count; j++) 1978 psl->sl_addr[j-1] = psl->sl_addr[j]; 1979 psl->sl_count--; 1980 err = 0; 1981 goto done; 1982 } 1983 /* else, add a new source to the filter */ 1984 1985 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1986 err = -ENOBUFS; 1987 goto done; 1988 } 1989 if (!psl || psl->sl_count == psl->sl_max) { 1990 struct ip_sf_socklist *newpsl; 1991 int count = IP_SFBLOCK; 1992 1993 if (psl) 1994 count += psl->sl_max; 1995 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 1996 if (!newpsl) { 1997 err = -ENOBUFS; 1998 goto done; 1999 } 2000 newpsl->sl_max = count; 2001 newpsl->sl_count = count - IP_SFBLOCK; 2002 if (psl) { 2003 for (i=0; i<psl->sl_count; i++) 2004 newpsl->sl_addr[i] = psl->sl_addr[i]; 2005 /* decrease mem now to avoid the memleak warning */ 2006 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2007 kfree_rcu(psl, rcu); 2008 } 2009 RCU_INIT_POINTER(pmc->sflist, newpsl); 2010 psl = newpsl; 2011 } 2012 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2013 for (i=0; i<psl->sl_count; i++) { 2014 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2015 sizeof(__be32)); 2016 if (rv == 0) 2017 break; 2018 } 2019 if (rv == 0) /* address already there is an error */ 2020 goto done; 2021 for (j=psl->sl_count-1; j>=i; j--) 2022 psl->sl_addr[j+1] = psl->sl_addr[j]; 2023 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2024 psl->sl_count++; 2025 err = 0; 2026 /* update the interface list */ 2027 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2028 &mreqs->imr_sourceaddr, 1); 2029 done: 2030 rtnl_unlock(); 2031 if (leavegroup) 2032 return ip_mc_leave_group(sk, &imr); 2033 return err; 2034 } 2035 2036 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2037 { 2038 int err = 0; 2039 struct ip_mreqn imr; 2040 __be32 addr = msf->imsf_multiaddr; 2041 struct ip_mc_socklist *pmc; 2042 struct in_device *in_dev; 2043 struct inet_sock *inet = inet_sk(sk); 2044 struct ip_sf_socklist *newpsl, *psl; 2045 struct net *net = sock_net(sk); 2046 int leavegroup = 0; 2047 2048 if (!ipv4_is_multicast(addr)) 2049 return -EINVAL; 2050 if (msf->imsf_fmode != MCAST_INCLUDE && 2051 msf->imsf_fmode != MCAST_EXCLUDE) 2052 return -EINVAL; 2053 2054 rtnl_lock(); 2055 2056 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2057 imr.imr_address.s_addr = msf->imsf_interface; 2058 imr.imr_ifindex = ifindex; 2059 in_dev = ip_mc_find_dev(net, &imr); 2060 2061 if (!in_dev) { 2062 err = -ENODEV; 2063 goto done; 2064 } 2065 2066 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2067 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2068 leavegroup = 1; 2069 goto done; 2070 } 2071 2072 for_each_pmc_rtnl(inet, pmc) { 2073 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2074 pmc->multi.imr_ifindex == imr.imr_ifindex) 2075 break; 2076 } 2077 if (!pmc) { /* must have a prior join */ 2078 err = -EINVAL; 2079 goto done; 2080 } 2081 if (msf->imsf_numsrc) { 2082 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2083 GFP_KERNEL); 2084 if (!newpsl) { 2085 err = -ENOBUFS; 2086 goto done; 2087 } 2088 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2089 memcpy(newpsl->sl_addr, msf->imsf_slist, 2090 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2091 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2092 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2093 if (err) { 2094 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2095 goto done; 2096 } 2097 } else { 2098 newpsl = NULL; 2099 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2100 msf->imsf_fmode, 0, NULL, 0); 2101 } 2102 psl = rtnl_dereference(pmc->sflist); 2103 if (psl) { 2104 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2105 psl->sl_count, psl->sl_addr, 0); 2106 /* decrease mem now to avoid the memleak warning */ 2107 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2108 kfree_rcu(psl, rcu); 2109 } else 2110 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2111 0, NULL, 0); 2112 RCU_INIT_POINTER(pmc->sflist, newpsl); 2113 pmc->sfmode = msf->imsf_fmode; 2114 err = 0; 2115 done: 2116 rtnl_unlock(); 2117 if (leavegroup) 2118 err = ip_mc_leave_group(sk, &imr); 2119 return err; 2120 } 2121 2122 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2123 struct ip_msfilter __user *optval, int __user *optlen) 2124 { 2125 int err, len, count, copycount; 2126 struct ip_mreqn imr; 2127 __be32 addr = msf->imsf_multiaddr; 2128 struct ip_mc_socklist *pmc; 2129 struct in_device *in_dev; 2130 struct inet_sock *inet = inet_sk(sk); 2131 struct ip_sf_socklist *psl; 2132 struct net *net = sock_net(sk); 2133 2134 if (!ipv4_is_multicast(addr)) 2135 return -EINVAL; 2136 2137 rtnl_lock(); 2138 2139 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2140 imr.imr_address.s_addr = msf->imsf_interface; 2141 imr.imr_ifindex = 0; 2142 in_dev = ip_mc_find_dev(net, &imr); 2143 2144 if (!in_dev) { 2145 err = -ENODEV; 2146 goto done; 2147 } 2148 err = -EADDRNOTAVAIL; 2149 2150 for_each_pmc_rtnl(inet, pmc) { 2151 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2152 pmc->multi.imr_ifindex == imr.imr_ifindex) 2153 break; 2154 } 2155 if (!pmc) /* must have a prior join */ 2156 goto done; 2157 msf->imsf_fmode = pmc->sfmode; 2158 psl = rtnl_dereference(pmc->sflist); 2159 rtnl_unlock(); 2160 if (!psl) { 2161 len = 0; 2162 count = 0; 2163 } else { 2164 count = psl->sl_count; 2165 } 2166 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2167 len = copycount * sizeof(psl->sl_addr[0]); 2168 msf->imsf_numsrc = count; 2169 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2170 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2171 return -EFAULT; 2172 } 2173 if (len && 2174 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2175 return -EFAULT; 2176 return 0; 2177 done: 2178 rtnl_unlock(); 2179 return err; 2180 } 2181 2182 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2183 struct group_filter __user *optval, int __user *optlen) 2184 { 2185 int err, i, count, copycount; 2186 struct sockaddr_in *psin; 2187 __be32 addr; 2188 struct ip_mc_socklist *pmc; 2189 struct inet_sock *inet = inet_sk(sk); 2190 struct ip_sf_socklist *psl; 2191 2192 psin = (struct sockaddr_in *)&gsf->gf_group; 2193 if (psin->sin_family != AF_INET) 2194 return -EINVAL; 2195 addr = psin->sin_addr.s_addr; 2196 if (!ipv4_is_multicast(addr)) 2197 return -EINVAL; 2198 2199 rtnl_lock(); 2200 2201 err = -EADDRNOTAVAIL; 2202 2203 for_each_pmc_rtnl(inet, pmc) { 2204 if (pmc->multi.imr_multiaddr.s_addr == addr && 2205 pmc->multi.imr_ifindex == gsf->gf_interface) 2206 break; 2207 } 2208 if (!pmc) /* must have a prior join */ 2209 goto done; 2210 gsf->gf_fmode = pmc->sfmode; 2211 psl = rtnl_dereference(pmc->sflist); 2212 rtnl_unlock(); 2213 count = psl ? psl->sl_count : 0; 2214 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2215 gsf->gf_numsrc = count; 2216 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2217 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2218 return -EFAULT; 2219 } 2220 for (i=0; i<copycount; i++) { 2221 struct sockaddr_storage ss; 2222 2223 psin = (struct sockaddr_in *)&ss; 2224 memset(&ss, 0, sizeof(ss)); 2225 psin->sin_family = AF_INET; 2226 psin->sin_addr.s_addr = psl->sl_addr[i]; 2227 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2228 return -EFAULT; 2229 } 2230 return 0; 2231 done: 2232 rtnl_unlock(); 2233 return err; 2234 } 2235 2236 /* 2237 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2238 */ 2239 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2240 { 2241 struct inet_sock *inet = inet_sk(sk); 2242 struct ip_mc_socklist *pmc; 2243 struct ip_sf_socklist *psl; 2244 int i; 2245 int ret; 2246 2247 ret = 1; 2248 if (!ipv4_is_multicast(loc_addr)) 2249 goto out; 2250 2251 rcu_read_lock(); 2252 for_each_pmc_rcu(inet, pmc) { 2253 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2254 pmc->multi.imr_ifindex == dif) 2255 break; 2256 } 2257 ret = inet->mc_all; 2258 if (!pmc) 2259 goto unlock; 2260 psl = rcu_dereference(pmc->sflist); 2261 ret = (pmc->sfmode == MCAST_EXCLUDE); 2262 if (!psl) 2263 goto unlock; 2264 2265 for (i=0; i<psl->sl_count; i++) { 2266 if (psl->sl_addr[i] == rmt_addr) 2267 break; 2268 } 2269 ret = 0; 2270 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2271 goto unlock; 2272 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2273 goto unlock; 2274 ret = 1; 2275 unlock: 2276 rcu_read_unlock(); 2277 out: 2278 return ret; 2279 } 2280 2281 /* 2282 * A socket is closing. 2283 */ 2284 2285 void ip_mc_drop_socket(struct sock *sk) 2286 { 2287 struct inet_sock *inet = inet_sk(sk); 2288 struct ip_mc_socklist *iml; 2289 struct net *net = sock_net(sk); 2290 2291 if (inet->mc_list == NULL) 2292 return; 2293 2294 rtnl_lock(); 2295 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { 2296 struct in_device *in_dev; 2297 2298 inet->mc_list = iml->next_rcu; 2299 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2300 (void) ip_mc_leave_src(sk, iml, in_dev); 2301 if (in_dev != NULL) 2302 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2303 /* decrease mem now to avoid the memleak warning */ 2304 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2305 kfree_rcu(iml, rcu); 2306 } 2307 rtnl_unlock(); 2308 } 2309 2310 /* called with rcu_read_lock() */ 2311 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2312 { 2313 struct ip_mc_list *im; 2314 struct ip_sf_list *psf; 2315 int rv = 0; 2316 2317 for_each_pmc_rcu(in_dev, im) { 2318 if (im->multiaddr == mc_addr) 2319 break; 2320 } 2321 if (im && proto == IPPROTO_IGMP) { 2322 rv = 1; 2323 } else if (im) { 2324 if (src_addr) { 2325 for (psf=im->sources; psf; psf=psf->sf_next) { 2326 if (psf->sf_inaddr == src_addr) 2327 break; 2328 } 2329 if (psf) 2330 rv = psf->sf_count[MCAST_INCLUDE] || 2331 psf->sf_count[MCAST_EXCLUDE] != 2332 im->sfcount[MCAST_EXCLUDE]; 2333 else 2334 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2335 } else 2336 rv = 1; /* unspecified source; tentatively allow */ 2337 } 2338 return rv; 2339 } 2340 2341 #if defined(CONFIG_PROC_FS) 2342 struct igmp_mc_iter_state { 2343 struct seq_net_private p; 2344 struct net_device *dev; 2345 struct in_device *in_dev; 2346 }; 2347 2348 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2349 2350 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2351 { 2352 struct net *net = seq_file_net(seq); 2353 struct ip_mc_list *im = NULL; 2354 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2355 2356 state->in_dev = NULL; 2357 for_each_netdev_rcu(net, state->dev) { 2358 struct in_device *in_dev; 2359 2360 in_dev = __in_dev_get_rcu(state->dev); 2361 if (!in_dev) 2362 continue; 2363 im = rcu_dereference(in_dev->mc_list); 2364 if (im) { 2365 state->in_dev = in_dev; 2366 break; 2367 } 2368 } 2369 return im; 2370 } 2371 2372 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2373 { 2374 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2375 2376 im = rcu_dereference(im->next_rcu); 2377 while (!im) { 2378 state->dev = next_net_device_rcu(state->dev); 2379 if (!state->dev) { 2380 state->in_dev = NULL; 2381 break; 2382 } 2383 state->in_dev = __in_dev_get_rcu(state->dev); 2384 if (!state->in_dev) 2385 continue; 2386 im = rcu_dereference(state->in_dev->mc_list); 2387 } 2388 return im; 2389 } 2390 2391 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2392 { 2393 struct ip_mc_list *im = igmp_mc_get_first(seq); 2394 if (im) 2395 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2396 --pos; 2397 return pos ? NULL : im; 2398 } 2399 2400 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2401 __acquires(rcu) 2402 { 2403 rcu_read_lock(); 2404 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2405 } 2406 2407 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2408 { 2409 struct ip_mc_list *im; 2410 if (v == SEQ_START_TOKEN) 2411 im = igmp_mc_get_first(seq); 2412 else 2413 im = igmp_mc_get_next(seq, v); 2414 ++*pos; 2415 return im; 2416 } 2417 2418 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2419 __releases(rcu) 2420 { 2421 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2422 2423 state->in_dev = NULL; 2424 state->dev = NULL; 2425 rcu_read_unlock(); 2426 } 2427 2428 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2429 { 2430 if (v == SEQ_START_TOKEN) 2431 seq_puts(seq, 2432 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2433 else { 2434 struct ip_mc_list *im = (struct ip_mc_list *)v; 2435 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2436 char *querier; 2437 #ifdef CONFIG_IP_MULTICAST 2438 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2439 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2440 "V3"; 2441 #else 2442 querier = "NONE"; 2443 #endif 2444 2445 if (rcu_dereference(state->in_dev->mc_list) == im) { 2446 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2447 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2448 } 2449 2450 seq_printf(seq, 2451 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2452 im->multiaddr, im->users, 2453 im->tm_running, im->tm_running ? 2454 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2455 im->reporter); 2456 } 2457 return 0; 2458 } 2459 2460 static const struct seq_operations igmp_mc_seq_ops = { 2461 .start = igmp_mc_seq_start, 2462 .next = igmp_mc_seq_next, 2463 .stop = igmp_mc_seq_stop, 2464 .show = igmp_mc_seq_show, 2465 }; 2466 2467 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2468 { 2469 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2470 sizeof(struct igmp_mc_iter_state)); 2471 } 2472 2473 static const struct file_operations igmp_mc_seq_fops = { 2474 .owner = THIS_MODULE, 2475 .open = igmp_mc_seq_open, 2476 .read = seq_read, 2477 .llseek = seq_lseek, 2478 .release = seq_release_net, 2479 }; 2480 2481 struct igmp_mcf_iter_state { 2482 struct seq_net_private p; 2483 struct net_device *dev; 2484 struct in_device *idev; 2485 struct ip_mc_list *im; 2486 }; 2487 2488 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2489 2490 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2491 { 2492 struct net *net = seq_file_net(seq); 2493 struct ip_sf_list *psf = NULL; 2494 struct ip_mc_list *im = NULL; 2495 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2496 2497 state->idev = NULL; 2498 state->im = NULL; 2499 for_each_netdev_rcu(net, state->dev) { 2500 struct in_device *idev; 2501 idev = __in_dev_get_rcu(state->dev); 2502 if (unlikely(idev == NULL)) 2503 continue; 2504 im = rcu_dereference(idev->mc_list); 2505 if (likely(im != NULL)) { 2506 spin_lock_bh(&im->lock); 2507 psf = im->sources; 2508 if (likely(psf != NULL)) { 2509 state->im = im; 2510 state->idev = idev; 2511 break; 2512 } 2513 spin_unlock_bh(&im->lock); 2514 } 2515 } 2516 return psf; 2517 } 2518 2519 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2520 { 2521 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2522 2523 psf = psf->sf_next; 2524 while (!psf) { 2525 spin_unlock_bh(&state->im->lock); 2526 state->im = state->im->next; 2527 while (!state->im) { 2528 state->dev = next_net_device_rcu(state->dev); 2529 if (!state->dev) { 2530 state->idev = NULL; 2531 goto out; 2532 } 2533 state->idev = __in_dev_get_rcu(state->dev); 2534 if (!state->idev) 2535 continue; 2536 state->im = rcu_dereference(state->idev->mc_list); 2537 } 2538 if (!state->im) 2539 break; 2540 spin_lock_bh(&state->im->lock); 2541 psf = state->im->sources; 2542 } 2543 out: 2544 return psf; 2545 } 2546 2547 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2548 { 2549 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2550 if (psf) 2551 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2552 --pos; 2553 return pos ? NULL : psf; 2554 } 2555 2556 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2557 __acquires(rcu) 2558 { 2559 rcu_read_lock(); 2560 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2561 } 2562 2563 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2564 { 2565 struct ip_sf_list *psf; 2566 if (v == SEQ_START_TOKEN) 2567 psf = igmp_mcf_get_first(seq); 2568 else 2569 psf = igmp_mcf_get_next(seq, v); 2570 ++*pos; 2571 return psf; 2572 } 2573 2574 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2575 __releases(rcu) 2576 { 2577 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2578 if (likely(state->im != NULL)) { 2579 spin_unlock_bh(&state->im->lock); 2580 state->im = NULL; 2581 } 2582 state->idev = NULL; 2583 state->dev = NULL; 2584 rcu_read_unlock(); 2585 } 2586 2587 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2588 { 2589 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2590 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2591 2592 if (v == SEQ_START_TOKEN) { 2593 seq_printf(seq, 2594 "%3s %6s " 2595 "%10s %10s %6s %6s\n", "Idx", 2596 "Device", "MCA", 2597 "SRC", "INC", "EXC"); 2598 } else { 2599 seq_printf(seq, 2600 "%3d %6.6s 0x%08x " 2601 "0x%08x %6lu %6lu\n", 2602 state->dev->ifindex, state->dev->name, 2603 ntohl(state->im->multiaddr), 2604 ntohl(psf->sf_inaddr), 2605 psf->sf_count[MCAST_INCLUDE], 2606 psf->sf_count[MCAST_EXCLUDE]); 2607 } 2608 return 0; 2609 } 2610 2611 static const struct seq_operations igmp_mcf_seq_ops = { 2612 .start = igmp_mcf_seq_start, 2613 .next = igmp_mcf_seq_next, 2614 .stop = igmp_mcf_seq_stop, 2615 .show = igmp_mcf_seq_show, 2616 }; 2617 2618 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2619 { 2620 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2621 sizeof(struct igmp_mcf_iter_state)); 2622 } 2623 2624 static const struct file_operations igmp_mcf_seq_fops = { 2625 .owner = THIS_MODULE, 2626 .open = igmp_mcf_seq_open, 2627 .read = seq_read, 2628 .llseek = seq_lseek, 2629 .release = seq_release_net, 2630 }; 2631 2632 static int __net_init igmp_net_init(struct net *net) 2633 { 2634 struct proc_dir_entry *pde; 2635 2636 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2637 if (!pde) 2638 goto out_igmp; 2639 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2640 if (!pde) 2641 goto out_mcfilter; 2642 return 0; 2643 2644 out_mcfilter: 2645 proc_net_remove(net, "igmp"); 2646 out_igmp: 2647 return -ENOMEM; 2648 } 2649 2650 static void __net_exit igmp_net_exit(struct net *net) 2651 { 2652 proc_net_remove(net, "mcfilter"); 2653 proc_net_remove(net, "igmp"); 2654 } 2655 2656 static struct pernet_operations igmp_net_ops = { 2657 .init = igmp_net_init, 2658 .exit = igmp_net_exit, 2659 }; 2660 2661 int __init igmp_mc_proc_init(void) 2662 { 2663 return register_pernet_subsys(&igmp_net_ops); 2664 } 2665 #endif 2666