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(im); 157 } 158 } 159 160 #ifdef CONFIG_IP_MULTICAST 161 162 /* 163 * Timer management 164 */ 165 166 static __inline__ void igmp_stop_timer(struct ip_mc_list *im) 167 { 168 spin_lock_bh(&im->lock); 169 if (del_timer(&im->timer)) 170 atomic_dec(&im->refcnt); 171 im->tm_running = 0; 172 im->reporter = 0; 173 im->unsolicit_count = 0; 174 spin_unlock_bh(&im->lock); 175 } 176 177 /* It must be called with locked im->lock */ 178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay) 179 { 180 int tv = net_random() % max_delay; 181 182 im->tm_running = 1; 183 if (!mod_timer(&im->timer, jiffies+tv+2)) 184 atomic_inc(&im->refcnt); 185 } 186 187 static void igmp_gq_start_timer(struct in_device *in_dev) 188 { 189 int tv = net_random() % in_dev->mr_maxdelay; 190 191 in_dev->mr_gq_running = 1; 192 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) 193 in_dev_hold(in_dev); 194 } 195 196 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) 197 { 198 int tv = net_random() % delay; 199 200 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) 201 in_dev_hold(in_dev); 202 } 203 204 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) 205 { 206 spin_lock_bh(&im->lock); 207 im->unsolicit_count = 0; 208 if (del_timer(&im->timer)) { 209 if ((long)(im->timer.expires-jiffies) < max_delay) { 210 add_timer(&im->timer); 211 im->tm_running = 1; 212 spin_unlock_bh(&im->lock); 213 return; 214 } 215 atomic_dec(&im->refcnt); 216 } 217 igmp_start_timer(im, max_delay); 218 spin_unlock_bh(&im->lock); 219 } 220 221 222 /* 223 * Send an IGMP report. 224 */ 225 226 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) 227 228 229 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, 230 int gdeleted, int sdeleted) 231 { 232 switch (type) { 233 case IGMPV3_MODE_IS_INCLUDE: 234 case IGMPV3_MODE_IS_EXCLUDE: 235 if (gdeleted || sdeleted) 236 return 0; 237 if (!(pmc->gsquery && !psf->sf_gsresp)) { 238 if (pmc->sfmode == MCAST_INCLUDE) 239 return 1; 240 /* don't include if this source is excluded 241 * in all filters 242 */ 243 if (psf->sf_count[MCAST_INCLUDE]) 244 return type == IGMPV3_MODE_IS_INCLUDE; 245 return pmc->sfcount[MCAST_EXCLUDE] == 246 psf->sf_count[MCAST_EXCLUDE]; 247 } 248 return 0; 249 case IGMPV3_CHANGE_TO_INCLUDE: 250 if (gdeleted || sdeleted) 251 return 0; 252 return psf->sf_count[MCAST_INCLUDE] != 0; 253 case IGMPV3_CHANGE_TO_EXCLUDE: 254 if (gdeleted || sdeleted) 255 return 0; 256 if (pmc->sfcount[MCAST_EXCLUDE] == 0 || 257 psf->sf_count[MCAST_INCLUDE]) 258 return 0; 259 return pmc->sfcount[MCAST_EXCLUDE] == 260 psf->sf_count[MCAST_EXCLUDE]; 261 case IGMPV3_ALLOW_NEW_SOURCES: 262 if (gdeleted || !psf->sf_crcount) 263 return 0; 264 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; 265 case IGMPV3_BLOCK_OLD_SOURCES: 266 if (pmc->sfmode == MCAST_INCLUDE) 267 return gdeleted || (psf->sf_crcount && sdeleted); 268 return psf->sf_crcount && !gdeleted && !sdeleted; 269 } 270 return 0; 271 } 272 273 static int 274 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) 275 { 276 struct ip_sf_list *psf; 277 int scount = 0; 278 279 for (psf=pmc->sources; psf; psf=psf->sf_next) { 280 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) 281 continue; 282 scount++; 283 } 284 return scount; 285 } 286 287 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) 288 { 289 struct sk_buff *skb; 290 struct rtable *rt; 291 struct iphdr *pip; 292 struct igmpv3_report *pig; 293 struct net *net = dev_net(dev); 294 295 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 296 if (skb == NULL) 297 return NULL; 298 299 { 300 struct flowi fl = { .oif = dev->ifindex, 301 .nl_u = { .ip4_u = { 302 .daddr = IGMPV3_ALL_MCR } }, 303 .proto = IPPROTO_IGMP }; 304 if (ip_route_output_key(net, &rt, &fl)) { 305 kfree_skb(skb); 306 return NULL; 307 } 308 } 309 if (rt->rt_src == 0) { 310 kfree_skb(skb); 311 ip_rt_put(rt); 312 return NULL; 313 } 314 315 skb_dst_set(skb, &rt->dst); 316 skb->dev = dev; 317 318 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 319 320 skb_reset_network_header(skb); 321 pip = ip_hdr(skb); 322 skb_put(skb, sizeof(struct iphdr) + 4); 323 324 pip->version = 4; 325 pip->ihl = (sizeof(struct iphdr)+4)>>2; 326 pip->tos = 0xc0; 327 pip->frag_off = htons(IP_DF); 328 pip->ttl = 1; 329 pip->daddr = rt->rt_dst; 330 pip->saddr = rt->rt_src; 331 pip->protocol = IPPROTO_IGMP; 332 pip->tot_len = 0; /* filled in later */ 333 ip_select_ident(pip, &rt->dst, NULL); 334 ((u8*)&pip[1])[0] = IPOPT_RA; 335 ((u8*)&pip[1])[1] = 4; 336 ((u8*)&pip[1])[2] = 0; 337 ((u8*)&pip[1])[3] = 0; 338 339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; 340 skb_put(skb, sizeof(*pig)); 341 pig = igmpv3_report_hdr(skb); 342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; 343 pig->resv1 = 0; 344 pig->csum = 0; 345 pig->resv2 = 0; 346 pig->ngrec = 0; 347 return skb; 348 } 349 350 static int igmpv3_sendpack(struct sk_buff *skb) 351 { 352 struct igmphdr *pig = igmp_hdr(skb); 353 const int igmplen = skb->tail - skb->transport_header; 354 355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); 356 357 return ip_local_out(skb); 358 } 359 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) 361 { 362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); 363 } 364 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, 366 int type, struct igmpv3_grec **ppgr) 367 { 368 struct net_device *dev = pmc->interface->dev; 369 struct igmpv3_report *pih; 370 struct igmpv3_grec *pgr; 371 372 if (!skb) 373 skb = igmpv3_newpack(dev, dev->mtu); 374 if (!skb) 375 return NULL; 376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); 377 pgr->grec_type = type; 378 pgr->grec_auxwords = 0; 379 pgr->grec_nsrcs = 0; 380 pgr->grec_mca = pmc->multiaddr; 381 pih = igmpv3_report_hdr(skb); 382 pih->ngrec = htons(ntohs(pih->ngrec)+1); 383 *ppgr = pgr; 384 return skb; 385 } 386 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ 388 skb_tailroom(skb)) : 0) 389 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, 391 int type, int gdeleted, int sdeleted) 392 { 393 struct net_device *dev = pmc->interface->dev; 394 struct igmpv3_report *pih; 395 struct igmpv3_grec *pgr = NULL; 396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; 397 int scount, stotal, first, isquery, truncate; 398 399 if (pmc->multiaddr == IGMP_ALL_HOSTS) 400 return skb; 401 402 isquery = type == IGMPV3_MODE_IS_INCLUDE || 403 type == IGMPV3_MODE_IS_EXCLUDE; 404 truncate = type == IGMPV3_MODE_IS_EXCLUDE || 405 type == IGMPV3_CHANGE_TO_EXCLUDE; 406 407 stotal = scount = 0; 408 409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources; 410 411 if (!*psf_list) 412 goto empty_source; 413 414 pih = skb ? igmpv3_report_hdr(skb) : NULL; 415 416 /* EX and TO_EX get a fresh packet, if needed */ 417 if (truncate) { 418 if (pih && pih->ngrec && 419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { 420 if (skb) 421 igmpv3_sendpack(skb); 422 skb = igmpv3_newpack(dev, dev->mtu); 423 } 424 } 425 first = 1; 426 psf_prev = NULL; 427 for (psf=*psf_list; psf; psf=psf_next) { 428 __be32 *psrc; 429 430 psf_next = psf->sf_next; 431 432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { 433 psf_prev = psf; 434 continue; 435 } 436 437 /* clear marks on query responses */ 438 if (isquery) 439 psf->sf_gsresp = 0; 440 441 if (AVAILABLE(skb) < sizeof(__be32) + 442 first*sizeof(struct igmpv3_grec)) { 443 if (truncate && !first) 444 break; /* truncate these */ 445 if (pgr) 446 pgr->grec_nsrcs = htons(scount); 447 if (skb) 448 igmpv3_sendpack(skb); 449 skb = igmpv3_newpack(dev, dev->mtu); 450 first = 1; 451 scount = 0; 452 } 453 if (first) { 454 skb = add_grhead(skb, pmc, type, &pgr); 455 first = 0; 456 } 457 if (!skb) 458 return NULL; 459 psrc = (__be32 *)skb_put(skb, sizeof(__be32)); 460 *psrc = psf->sf_inaddr; 461 scount++; stotal++; 462 if ((type == IGMPV3_ALLOW_NEW_SOURCES || 463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { 464 psf->sf_crcount--; 465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { 466 if (psf_prev) 467 psf_prev->sf_next = psf->sf_next; 468 else 469 *psf_list = psf->sf_next; 470 kfree(psf); 471 continue; 472 } 473 } 474 psf_prev = psf; 475 } 476 477 empty_source: 478 if (!stotal) { 479 if (type == IGMPV3_ALLOW_NEW_SOURCES || 480 type == IGMPV3_BLOCK_OLD_SOURCES) 481 return skb; 482 if (pmc->crcount || isquery) { 483 /* make sure we have room for group header */ 484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { 485 igmpv3_sendpack(skb); 486 skb = NULL; /* add_grhead will get a new one */ 487 } 488 skb = add_grhead(skb, pmc, type, &pgr); 489 } 490 } 491 if (pgr) 492 pgr->grec_nsrcs = htons(scount); 493 494 if (isquery) 495 pmc->gsquery = 0; /* clear query state on report */ 496 return skb; 497 } 498 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) 500 { 501 struct sk_buff *skb = NULL; 502 int type; 503 504 if (!pmc) { 505 read_lock(&in_dev->mc_list_lock); 506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 507 if (pmc->multiaddr == IGMP_ALL_HOSTS) 508 continue; 509 spin_lock_bh(&pmc->lock); 510 if (pmc->sfcount[MCAST_EXCLUDE]) 511 type = IGMPV3_MODE_IS_EXCLUDE; 512 else 513 type = IGMPV3_MODE_IS_INCLUDE; 514 skb = add_grec(skb, pmc, type, 0, 0); 515 spin_unlock_bh(&pmc->lock); 516 } 517 read_unlock(&in_dev->mc_list_lock); 518 } else { 519 spin_lock_bh(&pmc->lock); 520 if (pmc->sfcount[MCAST_EXCLUDE]) 521 type = IGMPV3_MODE_IS_EXCLUDE; 522 else 523 type = IGMPV3_MODE_IS_INCLUDE; 524 skb = add_grec(skb, pmc, type, 0, 0); 525 spin_unlock_bh(&pmc->lock); 526 } 527 if (!skb) 528 return 0; 529 return igmpv3_sendpack(skb); 530 } 531 532 /* 533 * remove zero-count source records from a source filter list 534 */ 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) 536 { 537 struct ip_sf_list *psf_prev, *psf_next, *psf; 538 539 psf_prev = NULL; 540 for (psf=*ppsf; psf; psf = psf_next) { 541 psf_next = psf->sf_next; 542 if (psf->sf_crcount == 0) { 543 if (psf_prev) 544 psf_prev->sf_next = psf->sf_next; 545 else 546 *ppsf = psf->sf_next; 547 kfree(psf); 548 } else 549 psf_prev = psf; 550 } 551 } 552 553 static void igmpv3_send_cr(struct in_device *in_dev) 554 { 555 struct ip_mc_list *pmc, *pmc_prev, *pmc_next; 556 struct sk_buff *skb = NULL; 557 int type, dtype; 558 559 read_lock(&in_dev->mc_list_lock); 560 spin_lock_bh(&in_dev->mc_tomb_lock); 561 562 /* deleted MCA's */ 563 pmc_prev = NULL; 564 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { 565 pmc_next = pmc->next; 566 if (pmc->sfmode == MCAST_INCLUDE) { 567 type = IGMPV3_BLOCK_OLD_SOURCES; 568 dtype = IGMPV3_BLOCK_OLD_SOURCES; 569 skb = add_grec(skb, pmc, type, 1, 0); 570 skb = add_grec(skb, pmc, dtype, 1, 1); 571 } 572 if (pmc->crcount) { 573 if (pmc->sfmode == MCAST_EXCLUDE) { 574 type = IGMPV3_CHANGE_TO_INCLUDE; 575 skb = add_grec(skb, pmc, type, 1, 0); 576 } 577 pmc->crcount--; 578 if (pmc->crcount == 0) { 579 igmpv3_clear_zeros(&pmc->tomb); 580 igmpv3_clear_zeros(&pmc->sources); 581 } 582 } 583 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { 584 if (pmc_prev) 585 pmc_prev->next = pmc_next; 586 else 587 in_dev->mc_tomb = pmc_next; 588 in_dev_put(pmc->interface); 589 kfree(pmc); 590 } else 591 pmc_prev = pmc; 592 } 593 spin_unlock_bh(&in_dev->mc_tomb_lock); 594 595 /* change recs */ 596 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 597 spin_lock_bh(&pmc->lock); 598 if (pmc->sfcount[MCAST_EXCLUDE]) { 599 type = IGMPV3_BLOCK_OLD_SOURCES; 600 dtype = IGMPV3_ALLOW_NEW_SOURCES; 601 } else { 602 type = IGMPV3_ALLOW_NEW_SOURCES; 603 dtype = IGMPV3_BLOCK_OLD_SOURCES; 604 } 605 skb = add_grec(skb, pmc, type, 0, 0); 606 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ 607 608 /* filter mode changes */ 609 if (pmc->crcount) { 610 if (pmc->sfmode == MCAST_EXCLUDE) 611 type = IGMPV3_CHANGE_TO_EXCLUDE; 612 else 613 type = IGMPV3_CHANGE_TO_INCLUDE; 614 skb = add_grec(skb, pmc, type, 0, 0); 615 pmc->crcount--; 616 } 617 spin_unlock_bh(&pmc->lock); 618 } 619 read_unlock(&in_dev->mc_list_lock); 620 621 if (!skb) 622 return; 623 (void) igmpv3_sendpack(skb); 624 } 625 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, 627 int type) 628 { 629 struct sk_buff *skb; 630 struct iphdr *iph; 631 struct igmphdr *ih; 632 struct rtable *rt; 633 struct net_device *dev = in_dev->dev; 634 struct net *net = dev_net(dev); 635 __be32 group = pmc ? pmc->multiaddr : 0; 636 __be32 dst; 637 638 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) 639 return igmpv3_send_report(in_dev, pmc); 640 else if (type == IGMP_HOST_LEAVE_MESSAGE) 641 dst = IGMP_ALL_ROUTER; 642 else 643 dst = group; 644 645 { 646 struct flowi fl = { .oif = dev->ifindex, 647 .nl_u = { .ip4_u = { .daddr = dst } }, 648 .proto = IPPROTO_IGMP }; 649 if (ip_route_output_key(net, &rt, &fl)) 650 return -1; 651 } 652 if (rt->rt_src == 0) { 653 ip_rt_put(rt); 654 return -1; 655 } 656 657 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); 658 if (skb == NULL) { 659 ip_rt_put(rt); 660 return -1; 661 } 662 663 skb_dst_set(skb, &rt->dst); 664 665 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 666 667 skb_reset_network_header(skb); 668 iph = ip_hdr(skb); 669 skb_put(skb, sizeof(struct iphdr) + 4); 670 671 iph->version = 4; 672 iph->ihl = (sizeof(struct iphdr)+4)>>2; 673 iph->tos = 0xc0; 674 iph->frag_off = htons(IP_DF); 675 iph->ttl = 1; 676 iph->daddr = dst; 677 iph->saddr = rt->rt_src; 678 iph->protocol = IPPROTO_IGMP; 679 ip_select_ident(iph, &rt->dst, NULL); 680 ((u8*)&iph[1])[0] = IPOPT_RA; 681 ((u8*)&iph[1])[1] = 4; 682 ((u8*)&iph[1])[2] = 0; 683 ((u8*)&iph[1])[3] = 0; 684 685 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 686 ih->type = type; 687 ih->code = 0; 688 ih->csum = 0; 689 ih->group = group; 690 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); 691 692 return ip_local_out(skb); 693 } 694 695 static void igmp_gq_timer_expire(unsigned long data) 696 { 697 struct in_device *in_dev = (struct in_device *)data; 698 699 in_dev->mr_gq_running = 0; 700 igmpv3_send_report(in_dev, NULL); 701 __in_dev_put(in_dev); 702 } 703 704 static void igmp_ifc_timer_expire(unsigned long data) 705 { 706 struct in_device *in_dev = (struct in_device *)data; 707 708 igmpv3_send_cr(in_dev); 709 if (in_dev->mr_ifc_count) { 710 in_dev->mr_ifc_count--; 711 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); 712 } 713 __in_dev_put(in_dev); 714 } 715 716 static void igmp_ifc_event(struct in_device *in_dev) 717 { 718 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) 719 return; 720 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : 721 IGMP_Unsolicited_Report_Count; 722 igmp_ifc_start_timer(in_dev, 1); 723 } 724 725 726 static void igmp_timer_expire(unsigned long data) 727 { 728 struct ip_mc_list *im=(struct ip_mc_list *)data; 729 struct in_device *in_dev = im->interface; 730 731 spin_lock(&im->lock); 732 im->tm_running = 0; 733 734 if (im->unsolicit_count) { 735 im->unsolicit_count--; 736 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); 737 } 738 im->reporter = 1; 739 spin_unlock(&im->lock); 740 741 if (IGMP_V1_SEEN(in_dev)) 742 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 743 else if (IGMP_V2_SEEN(in_dev)) 744 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 745 else 746 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 747 748 ip_ma_put(im); 749 } 750 751 /* mark EXCLUDE-mode sources */ 752 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 753 { 754 struct ip_sf_list *psf; 755 int i, scount; 756 757 scount = 0; 758 for (psf=pmc->sources; psf; psf=psf->sf_next) { 759 if (scount == nsrcs) 760 break; 761 for (i=0; i<nsrcs; i++) { 762 /* skip inactive filters */ 763 if (pmc->sfcount[MCAST_INCLUDE] || 764 pmc->sfcount[MCAST_EXCLUDE] != 765 psf->sf_count[MCAST_EXCLUDE]) 766 continue; 767 if (srcs[i] == psf->sf_inaddr) { 768 scount++; 769 break; 770 } 771 } 772 } 773 pmc->gsquery = 0; 774 if (scount == nsrcs) /* all sources excluded */ 775 return 0; 776 return 1; 777 } 778 779 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) 780 { 781 struct ip_sf_list *psf; 782 int i, scount; 783 784 if (pmc->sfmode == MCAST_EXCLUDE) 785 return igmp_xmarksources(pmc, nsrcs, srcs); 786 787 /* mark INCLUDE-mode sources */ 788 scount = 0; 789 for (psf=pmc->sources; psf; psf=psf->sf_next) { 790 if (scount == nsrcs) 791 break; 792 for (i=0; i<nsrcs; i++) 793 if (srcs[i] == psf->sf_inaddr) { 794 psf->sf_gsresp = 1; 795 scount++; 796 break; 797 } 798 } 799 if (!scount) { 800 pmc->gsquery = 0; 801 return 0; 802 } 803 pmc->gsquery = 1; 804 return 1; 805 } 806 807 static void igmp_heard_report(struct in_device *in_dev, __be32 group) 808 { 809 struct ip_mc_list *im; 810 811 /* Timers are only set for non-local groups */ 812 813 if (group == IGMP_ALL_HOSTS) 814 return; 815 816 read_lock(&in_dev->mc_list_lock); 817 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 818 if (im->multiaddr == group) { 819 igmp_stop_timer(im); 820 break; 821 } 822 } 823 read_unlock(&in_dev->mc_list_lock); 824 } 825 826 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, 827 int len) 828 { 829 struct igmphdr *ih = igmp_hdr(skb); 830 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); 831 struct ip_mc_list *im; 832 __be32 group = ih->group; 833 int max_delay; 834 int mark = 0; 835 836 837 if (len == 8) { 838 if (ih->code == 0) { 839 /* Alas, old v1 router presents here. */ 840 841 max_delay = IGMP_Query_Response_Interval; 842 in_dev->mr_v1_seen = jiffies + 843 IGMP_V1_Router_Present_Timeout; 844 group = 0; 845 } else { 846 /* v2 router present */ 847 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); 848 in_dev->mr_v2_seen = jiffies + 849 IGMP_V2_Router_Present_Timeout; 850 } 851 /* cancel the interface change timer */ 852 in_dev->mr_ifc_count = 0; 853 if (del_timer(&in_dev->mr_ifc_timer)) 854 __in_dev_put(in_dev); 855 /* clear deleted report items */ 856 igmpv3_clear_delrec(in_dev); 857 } else if (len < 12) { 858 return; /* ignore bogus packet; freed by caller */ 859 } else if (IGMP_V1_SEEN(in_dev)) { 860 /* This is a v3 query with v1 queriers present */ 861 max_delay = IGMP_Query_Response_Interval; 862 group = 0; 863 } else if (IGMP_V2_SEEN(in_dev)) { 864 /* this is a v3 query with v2 queriers present; 865 * Interpretation of the max_delay code is problematic here. 866 * A real v2 host would use ih_code directly, while v3 has a 867 * different encoding. We use the v3 encoding as more likely 868 * to be intended in a v3 query. 869 */ 870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 871 } else { /* v3 */ 872 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) 873 return; 874 875 ih3 = igmpv3_query_hdr(skb); 876 if (ih3->nsrcs) { 877 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) 878 + ntohs(ih3->nsrcs)*sizeof(__be32))) 879 return; 880 ih3 = igmpv3_query_hdr(skb); 881 } 882 883 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); 884 if (!max_delay) 885 max_delay = 1; /* can't mod w/ 0 */ 886 in_dev->mr_maxdelay = max_delay; 887 if (ih3->qrv) 888 in_dev->mr_qrv = ih3->qrv; 889 if (!group) { /* general query */ 890 if (ih3->nsrcs) 891 return; /* no sources allowed */ 892 igmp_gq_start_timer(in_dev); 893 return; 894 } 895 /* mark sources to include, if group & source-specific */ 896 mark = ih3->nsrcs != 0; 897 } 898 899 /* 900 * - Start the timers in all of our membership records 901 * that the query applies to for the interface on 902 * which the query arrived excl. those that belong 903 * to a "local" group (224.0.0.X) 904 * - For timers already running check if they need to 905 * be reset. 906 * - Use the igmp->igmp_code field as the maximum 907 * delay possible 908 */ 909 read_lock(&in_dev->mc_list_lock); 910 for (im=in_dev->mc_list; im!=NULL; im=im->next) { 911 int changed; 912 913 if (group && group != im->multiaddr) 914 continue; 915 if (im->multiaddr == IGMP_ALL_HOSTS) 916 continue; 917 spin_lock_bh(&im->lock); 918 if (im->tm_running) 919 im->gsquery = im->gsquery && mark; 920 else 921 im->gsquery = mark; 922 changed = !im->gsquery || 923 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); 924 spin_unlock_bh(&im->lock); 925 if (changed) 926 igmp_mod_timer(im, max_delay); 927 } 928 read_unlock(&in_dev->mc_list_lock); 929 } 930 931 /* called in rcu_read_lock() section */ 932 int igmp_rcv(struct sk_buff *skb) 933 { 934 /* This basically follows the spec line by line -- see RFC1112 */ 935 struct igmphdr *ih; 936 struct in_device *in_dev = __in_dev_get_rcu(skb->dev); 937 int len = skb->len; 938 939 if (in_dev == NULL) 940 goto drop; 941 942 if (!pskb_may_pull(skb, sizeof(struct igmphdr))) 943 goto drop; 944 945 switch (skb->ip_summed) { 946 case CHECKSUM_COMPLETE: 947 if (!csum_fold(skb->csum)) 948 break; 949 /* fall through */ 950 case CHECKSUM_NONE: 951 skb->csum = 0; 952 if (__skb_checksum_complete(skb)) 953 goto drop; 954 } 955 956 ih = igmp_hdr(skb); 957 switch (ih->type) { 958 case IGMP_HOST_MEMBERSHIP_QUERY: 959 igmp_heard_query(in_dev, skb, len); 960 break; 961 case IGMP_HOST_MEMBERSHIP_REPORT: 962 case IGMPV2_HOST_MEMBERSHIP_REPORT: 963 /* Is it our report looped back? */ 964 if (skb_rtable(skb)->fl.iif == 0) 965 break; 966 /* don't rely on MC router hearing unicast reports */ 967 if (skb->pkt_type == PACKET_MULTICAST || 968 skb->pkt_type == PACKET_BROADCAST) 969 igmp_heard_report(in_dev, ih->group); 970 break; 971 case IGMP_PIM: 972 #ifdef CONFIG_IP_PIMSM_V1 973 return pim_rcv_v1(skb); 974 #endif 975 case IGMPV3_HOST_MEMBERSHIP_REPORT: 976 case IGMP_DVMRP: 977 case IGMP_TRACE: 978 case IGMP_HOST_LEAVE_MESSAGE: 979 case IGMP_MTRACE: 980 case IGMP_MTRACE_RESP: 981 break; 982 default: 983 break; 984 } 985 986 drop: 987 kfree_skb(skb); 988 return 0; 989 } 990 991 #endif 992 993 994 /* 995 * Add a filter to a device 996 */ 997 998 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) 999 { 1000 char buf[MAX_ADDR_LEN]; 1001 struct net_device *dev = in_dev->dev; 1002 1003 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. 1004 We will get multicast token leakage, when IFF_MULTICAST 1005 is changed. This check should be done in dev->set_multicast_list 1006 routine. Something sort of: 1007 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } 1008 --ANK 1009 */ 1010 if (arp_mc_map(addr, buf, dev, 0) == 0) 1011 dev_mc_add(dev, buf); 1012 } 1013 1014 /* 1015 * Remove a filter from a device 1016 */ 1017 1018 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) 1019 { 1020 char buf[MAX_ADDR_LEN]; 1021 struct net_device *dev = in_dev->dev; 1022 1023 if (arp_mc_map(addr, buf, dev, 0) == 0) 1024 dev_mc_del(dev, buf); 1025 } 1026 1027 #ifdef CONFIG_IP_MULTICAST 1028 /* 1029 * deleted ip_mc_list manipulation 1030 */ 1031 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) 1032 { 1033 struct ip_mc_list *pmc; 1034 1035 /* this is an "ip_mc_list" for convenience; only the fields below 1036 * are actually used. In particular, the refcnt and users are not 1037 * used for management of the delete list. Using the same structure 1038 * for deleted items allows change reports to use common code with 1039 * non-deleted or query-response MCA's. 1040 */ 1041 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); 1042 if (!pmc) 1043 return; 1044 spin_lock_bh(&im->lock); 1045 pmc->interface = im->interface; 1046 in_dev_hold(in_dev); 1047 pmc->multiaddr = im->multiaddr; 1048 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1049 IGMP_Unsolicited_Report_Count; 1050 pmc->sfmode = im->sfmode; 1051 if (pmc->sfmode == MCAST_INCLUDE) { 1052 struct ip_sf_list *psf; 1053 1054 pmc->tomb = im->tomb; 1055 pmc->sources = im->sources; 1056 im->tomb = im->sources = NULL; 1057 for (psf=pmc->sources; psf; psf=psf->sf_next) 1058 psf->sf_crcount = pmc->crcount; 1059 } 1060 spin_unlock_bh(&im->lock); 1061 1062 spin_lock_bh(&in_dev->mc_tomb_lock); 1063 pmc->next = in_dev->mc_tomb; 1064 in_dev->mc_tomb = pmc; 1065 spin_unlock_bh(&in_dev->mc_tomb_lock); 1066 } 1067 1068 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) 1069 { 1070 struct ip_mc_list *pmc, *pmc_prev; 1071 struct ip_sf_list *psf, *psf_next; 1072 1073 spin_lock_bh(&in_dev->mc_tomb_lock); 1074 pmc_prev = NULL; 1075 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { 1076 if (pmc->multiaddr == multiaddr) 1077 break; 1078 pmc_prev = pmc; 1079 } 1080 if (pmc) { 1081 if (pmc_prev) 1082 pmc_prev->next = pmc->next; 1083 else 1084 in_dev->mc_tomb = pmc->next; 1085 } 1086 spin_unlock_bh(&in_dev->mc_tomb_lock); 1087 if (pmc) { 1088 for (psf=pmc->tomb; psf; psf=psf_next) { 1089 psf_next = psf->sf_next; 1090 kfree(psf); 1091 } 1092 in_dev_put(pmc->interface); 1093 kfree(pmc); 1094 } 1095 } 1096 1097 static void igmpv3_clear_delrec(struct in_device *in_dev) 1098 { 1099 struct ip_mc_list *pmc, *nextpmc; 1100 1101 spin_lock_bh(&in_dev->mc_tomb_lock); 1102 pmc = in_dev->mc_tomb; 1103 in_dev->mc_tomb = NULL; 1104 spin_unlock_bh(&in_dev->mc_tomb_lock); 1105 1106 for (; pmc; pmc = nextpmc) { 1107 nextpmc = pmc->next; 1108 ip_mc_clear_src(pmc); 1109 in_dev_put(pmc->interface); 1110 kfree(pmc); 1111 } 1112 /* clear dead sources, too */ 1113 read_lock(&in_dev->mc_list_lock); 1114 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1115 struct ip_sf_list *psf, *psf_next; 1116 1117 spin_lock_bh(&pmc->lock); 1118 psf = pmc->tomb; 1119 pmc->tomb = NULL; 1120 spin_unlock_bh(&pmc->lock); 1121 for (; psf; psf=psf_next) { 1122 psf_next = psf->sf_next; 1123 kfree(psf); 1124 } 1125 } 1126 read_unlock(&in_dev->mc_list_lock); 1127 } 1128 #endif 1129 1130 static void igmp_group_dropped(struct ip_mc_list *im) 1131 { 1132 struct in_device *in_dev = im->interface; 1133 #ifdef CONFIG_IP_MULTICAST 1134 int reporter; 1135 #endif 1136 1137 if (im->loaded) { 1138 im->loaded = 0; 1139 ip_mc_filter_del(in_dev, im->multiaddr); 1140 } 1141 1142 #ifdef CONFIG_IP_MULTICAST 1143 if (im->multiaddr == IGMP_ALL_HOSTS) 1144 return; 1145 1146 reporter = im->reporter; 1147 igmp_stop_timer(im); 1148 1149 if (!in_dev->dead) { 1150 if (IGMP_V1_SEEN(in_dev)) 1151 goto done; 1152 if (IGMP_V2_SEEN(in_dev)) { 1153 if (reporter) 1154 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); 1155 goto done; 1156 } 1157 /* IGMPv3 */ 1158 igmpv3_add_delrec(in_dev, im); 1159 1160 igmp_ifc_event(in_dev); 1161 } 1162 done: 1163 #endif 1164 ip_mc_clear_src(im); 1165 } 1166 1167 static void igmp_group_added(struct ip_mc_list *im) 1168 { 1169 struct in_device *in_dev = im->interface; 1170 1171 if (im->loaded == 0) { 1172 im->loaded = 1; 1173 ip_mc_filter_add(in_dev, im->multiaddr); 1174 } 1175 1176 #ifdef CONFIG_IP_MULTICAST 1177 if (im->multiaddr == IGMP_ALL_HOSTS) 1178 return; 1179 1180 if (in_dev->dead) 1181 return; 1182 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { 1183 spin_lock_bh(&im->lock); 1184 igmp_start_timer(im, IGMP_Initial_Report_Delay); 1185 spin_unlock_bh(&im->lock); 1186 return; 1187 } 1188 /* else, v3 */ 1189 1190 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1191 IGMP_Unsolicited_Report_Count; 1192 igmp_ifc_event(in_dev); 1193 #endif 1194 } 1195 1196 1197 /* 1198 * Multicast list managers 1199 */ 1200 1201 1202 /* 1203 * A socket has joined a multicast group on device dev. 1204 */ 1205 1206 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) 1207 { 1208 struct ip_mc_list *im; 1209 1210 ASSERT_RTNL(); 1211 1212 for (im=in_dev->mc_list; im; im=im->next) { 1213 if (im->multiaddr == addr) { 1214 im->users++; 1215 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); 1216 goto out; 1217 } 1218 } 1219 1220 im = kmalloc(sizeof(*im), GFP_KERNEL); 1221 if (!im) 1222 goto out; 1223 1224 im->users = 1; 1225 im->interface = in_dev; 1226 in_dev_hold(in_dev); 1227 im->multiaddr = addr; 1228 /* initial mode is (EX, empty) */ 1229 im->sfmode = MCAST_EXCLUDE; 1230 im->sfcount[MCAST_INCLUDE] = 0; 1231 im->sfcount[MCAST_EXCLUDE] = 1; 1232 im->sources = NULL; 1233 im->tomb = NULL; 1234 im->crcount = 0; 1235 atomic_set(&im->refcnt, 1); 1236 spin_lock_init(&im->lock); 1237 #ifdef CONFIG_IP_MULTICAST 1238 im->tm_running = 0; 1239 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); 1240 im->unsolicit_count = IGMP_Unsolicited_Report_Count; 1241 im->reporter = 0; 1242 im->gsquery = 0; 1243 #endif 1244 im->loaded = 0; 1245 write_lock_bh(&in_dev->mc_list_lock); 1246 im->next = in_dev->mc_list; 1247 in_dev->mc_list = im; 1248 in_dev->mc_count++; 1249 write_unlock_bh(&in_dev->mc_list_lock); 1250 #ifdef CONFIG_IP_MULTICAST 1251 igmpv3_del_delrec(in_dev, im->multiaddr); 1252 #endif 1253 igmp_group_added(im); 1254 if (!in_dev->dead) 1255 ip_rt_multicast_event(in_dev); 1256 out: 1257 return; 1258 } 1259 EXPORT_SYMBOL(ip_mc_inc_group); 1260 1261 /* 1262 * Resend IGMP JOIN report; used for bonding. 1263 */ 1264 void ip_mc_rejoin_group(struct ip_mc_list *im) 1265 { 1266 #ifdef CONFIG_IP_MULTICAST 1267 struct in_device *in_dev = im->interface; 1268 1269 if (im->multiaddr == IGMP_ALL_HOSTS) 1270 return; 1271 1272 /* a failover is happening and switches 1273 * must be notified immediately */ 1274 if (IGMP_V1_SEEN(in_dev)) 1275 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); 1276 else if (IGMP_V2_SEEN(in_dev)) 1277 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); 1278 else 1279 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); 1280 #endif 1281 } 1282 EXPORT_SYMBOL(ip_mc_rejoin_group); 1283 1284 /* 1285 * A socket has left a multicast group on device dev 1286 */ 1287 1288 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) 1289 { 1290 struct ip_mc_list *i, **ip; 1291 1292 ASSERT_RTNL(); 1293 1294 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { 1295 if (i->multiaddr == addr) { 1296 if (--i->users == 0) { 1297 write_lock_bh(&in_dev->mc_list_lock); 1298 *ip = i->next; 1299 in_dev->mc_count--; 1300 write_unlock_bh(&in_dev->mc_list_lock); 1301 igmp_group_dropped(i); 1302 1303 if (!in_dev->dead) 1304 ip_rt_multicast_event(in_dev); 1305 1306 ip_ma_put(i); 1307 return; 1308 } 1309 break; 1310 } 1311 } 1312 } 1313 EXPORT_SYMBOL(ip_mc_dec_group); 1314 1315 /* Device changing type */ 1316 1317 void ip_mc_unmap(struct in_device *in_dev) 1318 { 1319 struct ip_mc_list *i; 1320 1321 ASSERT_RTNL(); 1322 1323 for (i = in_dev->mc_list; i; i = i->next) 1324 igmp_group_dropped(i); 1325 } 1326 1327 void ip_mc_remap(struct in_device *in_dev) 1328 { 1329 struct ip_mc_list *i; 1330 1331 ASSERT_RTNL(); 1332 1333 for (i = in_dev->mc_list; i; i = i->next) 1334 igmp_group_added(i); 1335 } 1336 1337 /* Device going down */ 1338 1339 void ip_mc_down(struct in_device *in_dev) 1340 { 1341 struct ip_mc_list *i; 1342 1343 ASSERT_RTNL(); 1344 1345 for (i=in_dev->mc_list; i; i=i->next) 1346 igmp_group_dropped(i); 1347 1348 #ifdef CONFIG_IP_MULTICAST 1349 in_dev->mr_ifc_count = 0; 1350 if (del_timer(&in_dev->mr_ifc_timer)) 1351 __in_dev_put(in_dev); 1352 in_dev->mr_gq_running = 0; 1353 if (del_timer(&in_dev->mr_gq_timer)) 1354 __in_dev_put(in_dev); 1355 igmpv3_clear_delrec(in_dev); 1356 #endif 1357 1358 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); 1359 } 1360 1361 void ip_mc_init_dev(struct in_device *in_dev) 1362 { 1363 ASSERT_RTNL(); 1364 1365 in_dev->mc_tomb = NULL; 1366 #ifdef CONFIG_IP_MULTICAST 1367 in_dev->mr_gq_running = 0; 1368 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 1369 (unsigned long)in_dev); 1370 in_dev->mr_ifc_count = 0; 1371 in_dev->mc_count = 0; 1372 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 1373 (unsigned long)in_dev); 1374 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; 1375 #endif 1376 1377 rwlock_init(&in_dev->mc_list_lock); 1378 spin_lock_init(&in_dev->mc_tomb_lock); 1379 } 1380 1381 /* Device going up */ 1382 1383 void ip_mc_up(struct in_device *in_dev) 1384 { 1385 struct ip_mc_list *i; 1386 1387 ASSERT_RTNL(); 1388 1389 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); 1390 1391 for (i=in_dev->mc_list; i; i=i->next) 1392 igmp_group_added(i); 1393 } 1394 1395 /* 1396 * Device is about to be destroyed: clean up. 1397 */ 1398 1399 void ip_mc_destroy_dev(struct in_device *in_dev) 1400 { 1401 struct ip_mc_list *i; 1402 1403 ASSERT_RTNL(); 1404 1405 /* Deactivate timers */ 1406 ip_mc_down(in_dev); 1407 1408 write_lock_bh(&in_dev->mc_list_lock); 1409 while ((i = in_dev->mc_list) != NULL) { 1410 in_dev->mc_list = i->next; 1411 in_dev->mc_count--; 1412 write_unlock_bh(&in_dev->mc_list_lock); 1413 igmp_group_dropped(i); 1414 ip_ma_put(i); 1415 1416 write_lock_bh(&in_dev->mc_list_lock); 1417 } 1418 write_unlock_bh(&in_dev->mc_list_lock); 1419 } 1420 1421 /* RTNL is locked */ 1422 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) 1423 { 1424 struct flowi fl = { .nl_u = { .ip4_u = 1425 { .daddr = imr->imr_multiaddr.s_addr } } }; 1426 struct rtable *rt; 1427 struct net_device *dev = NULL; 1428 struct in_device *idev = NULL; 1429 1430 if (imr->imr_ifindex) { 1431 idev = inetdev_by_index(net, imr->imr_ifindex); 1432 return idev; 1433 } 1434 if (imr->imr_address.s_addr) { 1435 dev = __ip_dev_find(net, imr->imr_address.s_addr, false); 1436 if (!dev) 1437 return NULL; 1438 } 1439 1440 if (!dev && !ip_route_output_key(net, &rt, &fl)) { 1441 dev = rt->dst.dev; 1442 ip_rt_put(rt); 1443 } 1444 if (dev) { 1445 imr->imr_ifindex = dev->ifindex; 1446 idev = __in_dev_get_rtnl(dev); 1447 } 1448 return idev; 1449 } 1450 1451 /* 1452 * Join a socket to a group 1453 */ 1454 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; 1455 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; 1456 1457 1458 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, 1459 __be32 *psfsrc) 1460 { 1461 struct ip_sf_list *psf, *psf_prev; 1462 int rv = 0; 1463 1464 psf_prev = NULL; 1465 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1466 if (psf->sf_inaddr == *psfsrc) 1467 break; 1468 psf_prev = psf; 1469 } 1470 if (!psf || psf->sf_count[sfmode] == 0) { 1471 /* source filter not found, or count wrong => bug */ 1472 return -ESRCH; 1473 } 1474 psf->sf_count[sfmode]--; 1475 if (psf->sf_count[sfmode] == 0) { 1476 ip_rt_multicast_event(pmc->interface); 1477 } 1478 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { 1479 #ifdef CONFIG_IP_MULTICAST 1480 struct in_device *in_dev = pmc->interface; 1481 #endif 1482 1483 /* no more filters for this source */ 1484 if (psf_prev) 1485 psf_prev->sf_next = psf->sf_next; 1486 else 1487 pmc->sources = psf->sf_next; 1488 #ifdef CONFIG_IP_MULTICAST 1489 if (psf->sf_oldin && 1490 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { 1491 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1492 IGMP_Unsolicited_Report_Count; 1493 psf->sf_next = pmc->tomb; 1494 pmc->tomb = psf; 1495 rv = 1; 1496 } else 1497 #endif 1498 kfree(psf); 1499 } 1500 return rv; 1501 } 1502 1503 #ifndef CONFIG_IP_MULTICAST 1504 #define igmp_ifc_event(x) do { } while (0) 1505 #endif 1506 1507 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1508 int sfcount, __be32 *psfsrc, int delta) 1509 { 1510 struct ip_mc_list *pmc; 1511 int changerec = 0; 1512 int i, err; 1513 1514 if (!in_dev) 1515 return -ENODEV; 1516 read_lock(&in_dev->mc_list_lock); 1517 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1518 if (*pmca == pmc->multiaddr) 1519 break; 1520 } 1521 if (!pmc) { 1522 /* MCA not found?? bug */ 1523 read_unlock(&in_dev->mc_list_lock); 1524 return -ESRCH; 1525 } 1526 spin_lock_bh(&pmc->lock); 1527 read_unlock(&in_dev->mc_list_lock); 1528 #ifdef CONFIG_IP_MULTICAST 1529 sf_markstate(pmc); 1530 #endif 1531 if (!delta) { 1532 err = -EINVAL; 1533 if (!pmc->sfcount[sfmode]) 1534 goto out_unlock; 1535 pmc->sfcount[sfmode]--; 1536 } 1537 err = 0; 1538 for (i=0; i<sfcount; i++) { 1539 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1540 1541 changerec |= rv > 0; 1542 if (!err && rv < 0) 1543 err = rv; 1544 } 1545 if (pmc->sfmode == MCAST_EXCLUDE && 1546 pmc->sfcount[MCAST_EXCLUDE] == 0 && 1547 pmc->sfcount[MCAST_INCLUDE]) { 1548 #ifdef CONFIG_IP_MULTICAST 1549 struct ip_sf_list *psf; 1550 #endif 1551 1552 /* filter mode change */ 1553 pmc->sfmode = MCAST_INCLUDE; 1554 #ifdef CONFIG_IP_MULTICAST 1555 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1556 IGMP_Unsolicited_Report_Count; 1557 in_dev->mr_ifc_count = pmc->crcount; 1558 for (psf=pmc->sources; psf; psf = psf->sf_next) 1559 psf->sf_crcount = 0; 1560 igmp_ifc_event(pmc->interface); 1561 } else if (sf_setstate(pmc) || changerec) { 1562 igmp_ifc_event(pmc->interface); 1563 #endif 1564 } 1565 out_unlock: 1566 spin_unlock_bh(&pmc->lock); 1567 return err; 1568 } 1569 1570 /* 1571 * Add multicast single-source filter to the interface list 1572 */ 1573 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, 1574 __be32 *psfsrc, int delta) 1575 { 1576 struct ip_sf_list *psf, *psf_prev; 1577 1578 psf_prev = NULL; 1579 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1580 if (psf->sf_inaddr == *psfsrc) 1581 break; 1582 psf_prev = psf; 1583 } 1584 if (!psf) { 1585 psf = kzalloc(sizeof(*psf), GFP_ATOMIC); 1586 if (!psf) 1587 return -ENOBUFS; 1588 psf->sf_inaddr = *psfsrc; 1589 if (psf_prev) { 1590 psf_prev->sf_next = psf; 1591 } else 1592 pmc->sources = psf; 1593 } 1594 psf->sf_count[sfmode]++; 1595 if (psf->sf_count[sfmode] == 1) { 1596 ip_rt_multicast_event(pmc->interface); 1597 } 1598 return 0; 1599 } 1600 1601 #ifdef CONFIG_IP_MULTICAST 1602 static void sf_markstate(struct ip_mc_list *pmc) 1603 { 1604 struct ip_sf_list *psf; 1605 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1606 1607 for (psf=pmc->sources; psf; psf=psf->sf_next) 1608 if (pmc->sfcount[MCAST_EXCLUDE]) { 1609 psf->sf_oldin = mca_xcount == 1610 psf->sf_count[MCAST_EXCLUDE] && 1611 !psf->sf_count[MCAST_INCLUDE]; 1612 } else 1613 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; 1614 } 1615 1616 static int sf_setstate(struct ip_mc_list *pmc) 1617 { 1618 struct ip_sf_list *psf, *dpsf; 1619 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; 1620 int qrv = pmc->interface->mr_qrv; 1621 int new_in, rv; 1622 1623 rv = 0; 1624 for (psf=pmc->sources; psf; psf=psf->sf_next) { 1625 if (pmc->sfcount[MCAST_EXCLUDE]) { 1626 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && 1627 !psf->sf_count[MCAST_INCLUDE]; 1628 } else 1629 new_in = psf->sf_count[MCAST_INCLUDE] != 0; 1630 if (new_in) { 1631 if (!psf->sf_oldin) { 1632 struct ip_sf_list *prev = NULL; 1633 1634 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { 1635 if (dpsf->sf_inaddr == psf->sf_inaddr) 1636 break; 1637 prev = dpsf; 1638 } 1639 if (dpsf) { 1640 if (prev) 1641 prev->sf_next = dpsf->sf_next; 1642 else 1643 pmc->tomb = dpsf->sf_next; 1644 kfree(dpsf); 1645 } 1646 psf->sf_crcount = qrv; 1647 rv++; 1648 } 1649 } else if (psf->sf_oldin) { 1650 1651 psf->sf_crcount = 0; 1652 /* 1653 * add or update "delete" records if an active filter 1654 * is now inactive 1655 */ 1656 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) 1657 if (dpsf->sf_inaddr == psf->sf_inaddr) 1658 break; 1659 if (!dpsf) { 1660 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); 1661 if (!dpsf) 1662 continue; 1663 *dpsf = *psf; 1664 /* pmc->lock held by callers */ 1665 dpsf->sf_next = pmc->tomb; 1666 pmc->tomb = dpsf; 1667 } 1668 dpsf->sf_crcount = qrv; 1669 rv++; 1670 } 1671 } 1672 return rv; 1673 } 1674 #endif 1675 1676 /* 1677 * Add multicast source filter list to the interface list 1678 */ 1679 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, 1680 int sfcount, __be32 *psfsrc, int delta) 1681 { 1682 struct ip_mc_list *pmc; 1683 int isexclude; 1684 int i, err; 1685 1686 if (!in_dev) 1687 return -ENODEV; 1688 read_lock(&in_dev->mc_list_lock); 1689 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { 1690 if (*pmca == pmc->multiaddr) 1691 break; 1692 } 1693 if (!pmc) { 1694 /* MCA not found?? bug */ 1695 read_unlock(&in_dev->mc_list_lock); 1696 return -ESRCH; 1697 } 1698 spin_lock_bh(&pmc->lock); 1699 read_unlock(&in_dev->mc_list_lock); 1700 1701 #ifdef CONFIG_IP_MULTICAST 1702 sf_markstate(pmc); 1703 #endif 1704 isexclude = pmc->sfmode == MCAST_EXCLUDE; 1705 if (!delta) 1706 pmc->sfcount[sfmode]++; 1707 err = 0; 1708 for (i=0; i<sfcount; i++) { 1709 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); 1710 if (err) 1711 break; 1712 } 1713 if (err) { 1714 int j; 1715 1716 pmc->sfcount[sfmode]--; 1717 for (j=0; j<i; j++) 1718 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); 1719 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { 1720 #ifdef CONFIG_IP_MULTICAST 1721 struct ip_sf_list *psf; 1722 in_dev = pmc->interface; 1723 #endif 1724 1725 /* filter mode change */ 1726 if (pmc->sfcount[MCAST_EXCLUDE]) 1727 pmc->sfmode = MCAST_EXCLUDE; 1728 else if (pmc->sfcount[MCAST_INCLUDE]) 1729 pmc->sfmode = MCAST_INCLUDE; 1730 #ifdef CONFIG_IP_MULTICAST 1731 /* else no filters; keep old mode for reports */ 1732 1733 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : 1734 IGMP_Unsolicited_Report_Count; 1735 in_dev->mr_ifc_count = pmc->crcount; 1736 for (psf=pmc->sources; psf; psf = psf->sf_next) 1737 psf->sf_crcount = 0; 1738 igmp_ifc_event(in_dev); 1739 } else if (sf_setstate(pmc)) { 1740 igmp_ifc_event(in_dev); 1741 #endif 1742 } 1743 spin_unlock_bh(&pmc->lock); 1744 return err; 1745 } 1746 1747 static void ip_mc_clear_src(struct ip_mc_list *pmc) 1748 { 1749 struct ip_sf_list *psf, *nextpsf; 1750 1751 for (psf=pmc->tomb; psf; psf=nextpsf) { 1752 nextpsf = psf->sf_next; 1753 kfree(psf); 1754 } 1755 pmc->tomb = NULL; 1756 for (psf=pmc->sources; psf; psf=nextpsf) { 1757 nextpsf = psf->sf_next; 1758 kfree(psf); 1759 } 1760 pmc->sources = NULL; 1761 pmc->sfmode = MCAST_EXCLUDE; 1762 pmc->sfcount[MCAST_INCLUDE] = 0; 1763 pmc->sfcount[MCAST_EXCLUDE] = 1; 1764 } 1765 1766 1767 /* 1768 * Join a multicast group 1769 */ 1770 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) 1771 { 1772 int err; 1773 __be32 addr = imr->imr_multiaddr.s_addr; 1774 struct ip_mc_socklist *iml = NULL, *i; 1775 struct in_device *in_dev; 1776 struct inet_sock *inet = inet_sk(sk); 1777 struct net *net = sock_net(sk); 1778 int ifindex; 1779 int count = 0; 1780 1781 if (!ipv4_is_multicast(addr)) 1782 return -EINVAL; 1783 1784 rtnl_lock(); 1785 1786 in_dev = ip_mc_find_dev(net, imr); 1787 1788 if (!in_dev) { 1789 iml = NULL; 1790 err = -ENODEV; 1791 goto done; 1792 } 1793 1794 err = -EADDRINUSE; 1795 ifindex = imr->imr_ifindex; 1796 for (i = inet->mc_list; i; i = i->next) { 1797 if (i->multi.imr_multiaddr.s_addr == addr && 1798 i->multi.imr_ifindex == ifindex) 1799 goto done; 1800 count++; 1801 } 1802 err = -ENOBUFS; 1803 if (count >= sysctl_igmp_max_memberships) 1804 goto done; 1805 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); 1806 if (iml == NULL) 1807 goto done; 1808 1809 memcpy(&iml->multi, imr, sizeof(*imr)); 1810 iml->next = inet->mc_list; 1811 iml->sflist = NULL; 1812 iml->sfmode = MCAST_EXCLUDE; 1813 rcu_assign_pointer(inet->mc_list, iml); 1814 ip_mc_inc_group(in_dev, addr); 1815 err = 0; 1816 done: 1817 rtnl_unlock(); 1818 return err; 1819 } 1820 EXPORT_SYMBOL(ip_mc_join_group); 1821 1822 static void ip_sf_socklist_reclaim(struct rcu_head *rp) 1823 { 1824 struct ip_sf_socklist *psf; 1825 1826 psf = container_of(rp, struct ip_sf_socklist, rcu); 1827 /* sk_omem_alloc should have been decreased by the caller*/ 1828 kfree(psf); 1829 } 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 = 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_assign_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 call_rcu(&psf->rcu, ip_sf_socklist_reclaim); 1848 return err; 1849 } 1850 1851 1852 static void ip_mc_socklist_reclaim(struct rcu_head *rp) 1853 { 1854 struct ip_mc_socklist *iml; 1855 1856 iml = container_of(rp, struct ip_mc_socklist, rcu); 1857 /* sk_omem_alloc should have been decreased by the caller*/ 1858 kfree(iml); 1859 } 1860 1861 1862 /* 1863 * Ask a socket to leave a group. 1864 */ 1865 1866 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) 1867 { 1868 struct inet_sock *inet = inet_sk(sk); 1869 struct ip_mc_socklist *iml, **imlp; 1870 struct in_device *in_dev; 1871 struct net *net = sock_net(sk); 1872 __be32 group = imr->imr_multiaddr.s_addr; 1873 u32 ifindex; 1874 int ret = -EADDRNOTAVAIL; 1875 1876 rtnl_lock(); 1877 in_dev = ip_mc_find_dev(net, imr); 1878 ifindex = imr->imr_ifindex; 1879 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { 1880 if (iml->multi.imr_multiaddr.s_addr != group) 1881 continue; 1882 if (ifindex) { 1883 if (iml->multi.imr_ifindex != ifindex) 1884 continue; 1885 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != 1886 iml->multi.imr_address.s_addr) 1887 continue; 1888 1889 (void) ip_mc_leave_src(sk, iml, in_dev); 1890 1891 rcu_assign_pointer(*imlp, iml->next); 1892 1893 if (in_dev) 1894 ip_mc_dec_group(in_dev, group); 1895 rtnl_unlock(); 1896 /* decrease mem now to avoid the memleak warning */ 1897 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 1898 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 1899 return 0; 1900 } 1901 if (!in_dev) 1902 ret = -ENODEV; 1903 rtnl_unlock(); 1904 return ret; 1905 } 1906 1907 int ip_mc_source(int add, int omode, struct sock *sk, struct 1908 ip_mreq_source *mreqs, int ifindex) 1909 { 1910 int err; 1911 struct ip_mreqn imr; 1912 __be32 addr = mreqs->imr_multiaddr; 1913 struct ip_mc_socklist *pmc; 1914 struct in_device *in_dev = NULL; 1915 struct inet_sock *inet = inet_sk(sk); 1916 struct ip_sf_socklist *psl; 1917 struct net *net = sock_net(sk); 1918 int leavegroup = 0; 1919 int i, j, rv; 1920 1921 if (!ipv4_is_multicast(addr)) 1922 return -EINVAL; 1923 1924 rtnl_lock(); 1925 1926 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; 1927 imr.imr_address.s_addr = mreqs->imr_interface; 1928 imr.imr_ifindex = ifindex; 1929 in_dev = ip_mc_find_dev(net, &imr); 1930 1931 if (!in_dev) { 1932 err = -ENODEV; 1933 goto done; 1934 } 1935 err = -EADDRNOTAVAIL; 1936 1937 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 1938 if ((pmc->multi.imr_multiaddr.s_addr == 1939 imr.imr_multiaddr.s_addr) && 1940 (pmc->multi.imr_ifindex == imr.imr_ifindex)) 1941 break; 1942 } 1943 if (!pmc) { /* must have a prior join */ 1944 err = -EINVAL; 1945 goto done; 1946 } 1947 /* if a source filter was set, must be the same mode as before */ 1948 if (pmc->sflist) { 1949 if (pmc->sfmode != omode) { 1950 err = -EINVAL; 1951 goto done; 1952 } 1953 } else if (pmc->sfmode != omode) { 1954 /* allow mode switches for empty-set filters */ 1955 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); 1956 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, 1957 NULL, 0); 1958 pmc->sfmode = omode; 1959 } 1960 1961 psl = pmc->sflist; 1962 if (!add) { 1963 if (!psl) 1964 goto done; /* err = -EADDRNOTAVAIL */ 1965 rv = !0; 1966 for (i=0; i<psl->sl_count; i++) { 1967 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 1968 sizeof(__be32)); 1969 if (rv == 0) 1970 break; 1971 } 1972 if (rv) /* source not found */ 1973 goto done; /* err = -EADDRNOTAVAIL */ 1974 1975 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 1976 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { 1977 leavegroup = 1; 1978 goto done; 1979 } 1980 1981 /* update the interface filter */ 1982 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 1983 &mreqs->imr_sourceaddr, 1); 1984 1985 for (j=i+1; j<psl->sl_count; j++) 1986 psl->sl_addr[j-1] = psl->sl_addr[j]; 1987 psl->sl_count--; 1988 err = 0; 1989 goto done; 1990 } 1991 /* else, add a new source to the filter */ 1992 1993 if (psl && psl->sl_count >= sysctl_igmp_max_msf) { 1994 err = -ENOBUFS; 1995 goto done; 1996 } 1997 if (!psl || psl->sl_count == psl->sl_max) { 1998 struct ip_sf_socklist *newpsl; 1999 int count = IP_SFBLOCK; 2000 2001 if (psl) 2002 count += psl->sl_max; 2003 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); 2004 if (!newpsl) { 2005 err = -ENOBUFS; 2006 goto done; 2007 } 2008 newpsl->sl_max = count; 2009 newpsl->sl_count = count - IP_SFBLOCK; 2010 if (psl) { 2011 for (i=0; i<psl->sl_count; i++) 2012 newpsl->sl_addr[i] = psl->sl_addr[i]; 2013 /* decrease mem now to avoid the memleak warning */ 2014 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2015 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2016 } 2017 rcu_assign_pointer(pmc->sflist, newpsl); 2018 psl = newpsl; 2019 } 2020 rv = 1; /* > 0 for insert logic below if sl_count is 0 */ 2021 for (i=0; i<psl->sl_count; i++) { 2022 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, 2023 sizeof(__be32)); 2024 if (rv == 0) 2025 break; 2026 } 2027 if (rv == 0) /* address already there is an error */ 2028 goto done; 2029 for (j=psl->sl_count-1; j>=i; j--) 2030 psl->sl_addr[j+1] = psl->sl_addr[j]; 2031 psl->sl_addr[i] = mreqs->imr_sourceaddr; 2032 psl->sl_count++; 2033 err = 0; 2034 /* update the interface list */ 2035 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, 2036 &mreqs->imr_sourceaddr, 1); 2037 done: 2038 rtnl_unlock(); 2039 if (leavegroup) 2040 return ip_mc_leave_group(sk, &imr); 2041 return err; 2042 } 2043 2044 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) 2045 { 2046 int err = 0; 2047 struct ip_mreqn imr; 2048 __be32 addr = msf->imsf_multiaddr; 2049 struct ip_mc_socklist *pmc; 2050 struct in_device *in_dev; 2051 struct inet_sock *inet = inet_sk(sk); 2052 struct ip_sf_socklist *newpsl, *psl; 2053 struct net *net = sock_net(sk); 2054 int leavegroup = 0; 2055 2056 if (!ipv4_is_multicast(addr)) 2057 return -EINVAL; 2058 if (msf->imsf_fmode != MCAST_INCLUDE && 2059 msf->imsf_fmode != MCAST_EXCLUDE) 2060 return -EINVAL; 2061 2062 rtnl_lock(); 2063 2064 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2065 imr.imr_address.s_addr = msf->imsf_interface; 2066 imr.imr_ifindex = ifindex; 2067 in_dev = ip_mc_find_dev(net, &imr); 2068 2069 if (!in_dev) { 2070 err = -ENODEV; 2071 goto done; 2072 } 2073 2074 /* special case - (INCLUDE, empty) == LEAVE_GROUP */ 2075 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { 2076 leavegroup = 1; 2077 goto done; 2078 } 2079 2080 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2081 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2082 pmc->multi.imr_ifindex == imr.imr_ifindex) 2083 break; 2084 } 2085 if (!pmc) { /* must have a prior join */ 2086 err = -EINVAL; 2087 goto done; 2088 } 2089 if (msf->imsf_numsrc) { 2090 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), 2091 GFP_KERNEL); 2092 if (!newpsl) { 2093 err = -ENOBUFS; 2094 goto done; 2095 } 2096 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; 2097 memcpy(newpsl->sl_addr, msf->imsf_slist, 2098 msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); 2099 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2100 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); 2101 if (err) { 2102 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); 2103 goto done; 2104 } 2105 } else { 2106 newpsl = NULL; 2107 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, 2108 msf->imsf_fmode, 0, NULL, 0); 2109 } 2110 psl = pmc->sflist; 2111 if (psl) { 2112 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2113 psl->sl_count, psl->sl_addr, 0); 2114 /* decrease mem now to avoid the memleak warning */ 2115 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); 2116 call_rcu(&psl->rcu, ip_sf_socklist_reclaim); 2117 } else 2118 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, 2119 0, NULL, 0); 2120 rcu_assign_pointer(pmc->sflist, newpsl); 2121 pmc->sfmode = msf->imsf_fmode; 2122 err = 0; 2123 done: 2124 rtnl_unlock(); 2125 if (leavegroup) 2126 err = ip_mc_leave_group(sk, &imr); 2127 return err; 2128 } 2129 2130 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 2131 struct ip_msfilter __user *optval, int __user *optlen) 2132 { 2133 int err, len, count, copycount; 2134 struct ip_mreqn imr; 2135 __be32 addr = msf->imsf_multiaddr; 2136 struct ip_mc_socklist *pmc; 2137 struct in_device *in_dev; 2138 struct inet_sock *inet = inet_sk(sk); 2139 struct ip_sf_socklist *psl; 2140 struct net *net = sock_net(sk); 2141 2142 if (!ipv4_is_multicast(addr)) 2143 return -EINVAL; 2144 2145 rtnl_lock(); 2146 2147 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; 2148 imr.imr_address.s_addr = msf->imsf_interface; 2149 imr.imr_ifindex = 0; 2150 in_dev = ip_mc_find_dev(net, &imr); 2151 2152 if (!in_dev) { 2153 err = -ENODEV; 2154 goto done; 2155 } 2156 err = -EADDRNOTAVAIL; 2157 2158 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2159 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && 2160 pmc->multi.imr_ifindex == imr.imr_ifindex) 2161 break; 2162 } 2163 if (!pmc) /* must have a prior join */ 2164 goto done; 2165 msf->imsf_fmode = pmc->sfmode; 2166 psl = pmc->sflist; 2167 rtnl_unlock(); 2168 if (!psl) { 2169 len = 0; 2170 count = 0; 2171 } else { 2172 count = psl->sl_count; 2173 } 2174 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; 2175 len = copycount * sizeof(psl->sl_addr[0]); 2176 msf->imsf_numsrc = count; 2177 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || 2178 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { 2179 return -EFAULT; 2180 } 2181 if (len && 2182 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) 2183 return -EFAULT; 2184 return 0; 2185 done: 2186 rtnl_unlock(); 2187 return err; 2188 } 2189 2190 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 2191 struct group_filter __user *optval, int __user *optlen) 2192 { 2193 int err, i, count, copycount; 2194 struct sockaddr_in *psin; 2195 __be32 addr; 2196 struct ip_mc_socklist *pmc; 2197 struct inet_sock *inet = inet_sk(sk); 2198 struct ip_sf_socklist *psl; 2199 2200 psin = (struct sockaddr_in *)&gsf->gf_group; 2201 if (psin->sin_family != AF_INET) 2202 return -EINVAL; 2203 addr = psin->sin_addr.s_addr; 2204 if (!ipv4_is_multicast(addr)) 2205 return -EINVAL; 2206 2207 rtnl_lock(); 2208 2209 err = -EADDRNOTAVAIL; 2210 2211 for (pmc=inet->mc_list; pmc; pmc=pmc->next) { 2212 if (pmc->multi.imr_multiaddr.s_addr == addr && 2213 pmc->multi.imr_ifindex == gsf->gf_interface) 2214 break; 2215 } 2216 if (!pmc) /* must have a prior join */ 2217 goto done; 2218 gsf->gf_fmode = pmc->sfmode; 2219 psl = pmc->sflist; 2220 rtnl_unlock(); 2221 count = psl ? psl->sl_count : 0; 2222 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; 2223 gsf->gf_numsrc = count; 2224 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || 2225 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { 2226 return -EFAULT; 2227 } 2228 for (i=0; i<copycount; i++) { 2229 struct sockaddr_storage ss; 2230 2231 psin = (struct sockaddr_in *)&ss; 2232 memset(&ss, 0, sizeof(ss)); 2233 psin->sin_family = AF_INET; 2234 psin->sin_addr.s_addr = psl->sl_addr[i]; 2235 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) 2236 return -EFAULT; 2237 } 2238 return 0; 2239 done: 2240 rtnl_unlock(); 2241 return err; 2242 } 2243 2244 /* 2245 * check if a multicast source filter allows delivery for a given <src,dst,intf> 2246 */ 2247 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) 2248 { 2249 struct inet_sock *inet = inet_sk(sk); 2250 struct ip_mc_socklist *pmc; 2251 struct ip_sf_socklist *psl; 2252 int i; 2253 int ret; 2254 2255 ret = 1; 2256 if (!ipv4_is_multicast(loc_addr)) 2257 goto out; 2258 2259 rcu_read_lock(); 2260 for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) { 2261 if (pmc->multi.imr_multiaddr.s_addr == loc_addr && 2262 pmc->multi.imr_ifindex == dif) 2263 break; 2264 } 2265 ret = inet->mc_all; 2266 if (!pmc) 2267 goto unlock; 2268 psl = pmc->sflist; 2269 ret = (pmc->sfmode == MCAST_EXCLUDE); 2270 if (!psl) 2271 goto unlock; 2272 2273 for (i=0; i<psl->sl_count; i++) { 2274 if (psl->sl_addr[i] == rmt_addr) 2275 break; 2276 } 2277 ret = 0; 2278 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) 2279 goto unlock; 2280 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) 2281 goto unlock; 2282 ret = 1; 2283 unlock: 2284 rcu_read_unlock(); 2285 out: 2286 return ret; 2287 } 2288 2289 /* 2290 * A socket is closing. 2291 */ 2292 2293 void ip_mc_drop_socket(struct sock *sk) 2294 { 2295 struct inet_sock *inet = inet_sk(sk); 2296 struct ip_mc_socklist *iml; 2297 struct net *net = sock_net(sk); 2298 2299 if (inet->mc_list == NULL) 2300 return; 2301 2302 rtnl_lock(); 2303 while ((iml = inet->mc_list) != NULL) { 2304 struct in_device *in_dev; 2305 rcu_assign_pointer(inet->mc_list, iml->next); 2306 2307 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); 2308 (void) ip_mc_leave_src(sk, iml, in_dev); 2309 if (in_dev != NULL) { 2310 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); 2311 in_dev_put(in_dev); 2312 } 2313 /* decrease mem now to avoid the memleak warning */ 2314 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); 2315 call_rcu(&iml->rcu, ip_mc_socklist_reclaim); 2316 } 2317 rtnl_unlock(); 2318 } 2319 2320 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) 2321 { 2322 struct ip_mc_list *im; 2323 struct ip_sf_list *psf; 2324 int rv = 0; 2325 2326 read_lock(&in_dev->mc_list_lock); 2327 for (im=in_dev->mc_list; im; im=im->next) { 2328 if (im->multiaddr == mc_addr) 2329 break; 2330 } 2331 if (im && proto == IPPROTO_IGMP) { 2332 rv = 1; 2333 } else if (im) { 2334 if (src_addr) { 2335 for (psf=im->sources; psf; psf=psf->sf_next) { 2336 if (psf->sf_inaddr == src_addr) 2337 break; 2338 } 2339 if (psf) 2340 rv = psf->sf_count[MCAST_INCLUDE] || 2341 psf->sf_count[MCAST_EXCLUDE] != 2342 im->sfcount[MCAST_EXCLUDE]; 2343 else 2344 rv = im->sfcount[MCAST_EXCLUDE] != 0; 2345 } else 2346 rv = 1; /* unspecified source; tentatively allow */ 2347 } 2348 read_unlock(&in_dev->mc_list_lock); 2349 return rv; 2350 } 2351 2352 #if defined(CONFIG_PROC_FS) 2353 struct igmp_mc_iter_state { 2354 struct seq_net_private p; 2355 struct net_device *dev; 2356 struct in_device *in_dev; 2357 }; 2358 2359 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) 2360 2361 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) 2362 { 2363 struct net *net = seq_file_net(seq); 2364 struct ip_mc_list *im = NULL; 2365 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2366 2367 state->in_dev = NULL; 2368 for_each_netdev_rcu(net, state->dev) { 2369 struct in_device *in_dev; 2370 2371 in_dev = __in_dev_get_rcu(state->dev); 2372 if (!in_dev) 2373 continue; 2374 read_lock(&in_dev->mc_list_lock); 2375 im = in_dev->mc_list; 2376 if (im) { 2377 state->in_dev = in_dev; 2378 break; 2379 } 2380 read_unlock(&in_dev->mc_list_lock); 2381 } 2382 return im; 2383 } 2384 2385 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) 2386 { 2387 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2388 im = im->next; 2389 while (!im) { 2390 if (likely(state->in_dev != NULL)) 2391 read_unlock(&state->in_dev->mc_list_lock); 2392 2393 state->dev = next_net_device_rcu(state->dev); 2394 if (!state->dev) { 2395 state->in_dev = NULL; 2396 break; 2397 } 2398 state->in_dev = __in_dev_get_rcu(state->dev); 2399 if (!state->in_dev) 2400 continue; 2401 read_lock(&state->in_dev->mc_list_lock); 2402 im = state->in_dev->mc_list; 2403 } 2404 return im; 2405 } 2406 2407 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) 2408 { 2409 struct ip_mc_list *im = igmp_mc_get_first(seq); 2410 if (im) 2411 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) 2412 --pos; 2413 return pos ? NULL : im; 2414 } 2415 2416 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) 2417 __acquires(rcu) 2418 { 2419 rcu_read_lock(); 2420 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2421 } 2422 2423 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2424 { 2425 struct ip_mc_list *im; 2426 if (v == SEQ_START_TOKEN) 2427 im = igmp_mc_get_first(seq); 2428 else 2429 im = igmp_mc_get_next(seq, v); 2430 ++*pos; 2431 return im; 2432 } 2433 2434 static void igmp_mc_seq_stop(struct seq_file *seq, void *v) 2435 __releases(rcu) 2436 { 2437 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2438 if (likely(state->in_dev != NULL)) { 2439 read_unlock(&state->in_dev->mc_list_lock); 2440 state->in_dev = NULL; 2441 } 2442 state->dev = NULL; 2443 rcu_read_unlock(); 2444 } 2445 2446 static int igmp_mc_seq_show(struct seq_file *seq, void *v) 2447 { 2448 if (v == SEQ_START_TOKEN) 2449 seq_puts(seq, 2450 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); 2451 else { 2452 struct ip_mc_list *im = (struct ip_mc_list *)v; 2453 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); 2454 char *querier; 2455 #ifdef CONFIG_IP_MULTICAST 2456 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : 2457 IGMP_V2_SEEN(state->in_dev) ? "V2" : 2458 "V3"; 2459 #else 2460 querier = "NONE"; 2461 #endif 2462 2463 if (state->in_dev->mc_list == im) { 2464 seq_printf(seq, "%d\t%-10s: %5d %7s\n", 2465 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); 2466 } 2467 2468 seq_printf(seq, 2469 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", 2470 im->multiaddr, im->users, 2471 im->tm_running, im->tm_running ? 2472 jiffies_to_clock_t(im->timer.expires-jiffies) : 0, 2473 im->reporter); 2474 } 2475 return 0; 2476 } 2477 2478 static const struct seq_operations igmp_mc_seq_ops = { 2479 .start = igmp_mc_seq_start, 2480 .next = igmp_mc_seq_next, 2481 .stop = igmp_mc_seq_stop, 2482 .show = igmp_mc_seq_show, 2483 }; 2484 2485 static int igmp_mc_seq_open(struct inode *inode, struct file *file) 2486 { 2487 return seq_open_net(inode, file, &igmp_mc_seq_ops, 2488 sizeof(struct igmp_mc_iter_state)); 2489 } 2490 2491 static const struct file_operations igmp_mc_seq_fops = { 2492 .owner = THIS_MODULE, 2493 .open = igmp_mc_seq_open, 2494 .read = seq_read, 2495 .llseek = seq_lseek, 2496 .release = seq_release_net, 2497 }; 2498 2499 struct igmp_mcf_iter_state { 2500 struct seq_net_private p; 2501 struct net_device *dev; 2502 struct in_device *idev; 2503 struct ip_mc_list *im; 2504 }; 2505 2506 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) 2507 2508 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) 2509 { 2510 struct net *net = seq_file_net(seq); 2511 struct ip_sf_list *psf = NULL; 2512 struct ip_mc_list *im = NULL; 2513 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2514 2515 state->idev = NULL; 2516 state->im = NULL; 2517 for_each_netdev_rcu(net, state->dev) { 2518 struct in_device *idev; 2519 idev = __in_dev_get_rcu(state->dev); 2520 if (unlikely(idev == NULL)) 2521 continue; 2522 read_lock(&idev->mc_list_lock); 2523 im = idev->mc_list; 2524 if (likely(im != NULL)) { 2525 spin_lock_bh(&im->lock); 2526 psf = im->sources; 2527 if (likely(psf != NULL)) { 2528 state->im = im; 2529 state->idev = idev; 2530 break; 2531 } 2532 spin_unlock_bh(&im->lock); 2533 } 2534 read_unlock(&idev->mc_list_lock); 2535 } 2536 return psf; 2537 } 2538 2539 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) 2540 { 2541 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2542 2543 psf = psf->sf_next; 2544 while (!psf) { 2545 spin_unlock_bh(&state->im->lock); 2546 state->im = state->im->next; 2547 while (!state->im) { 2548 if (likely(state->idev != NULL)) 2549 read_unlock(&state->idev->mc_list_lock); 2550 2551 state->dev = next_net_device_rcu(state->dev); 2552 if (!state->dev) { 2553 state->idev = NULL; 2554 goto out; 2555 } 2556 state->idev = __in_dev_get_rcu(state->dev); 2557 if (!state->idev) 2558 continue; 2559 read_lock(&state->idev->mc_list_lock); 2560 state->im = state->idev->mc_list; 2561 } 2562 if (!state->im) 2563 break; 2564 spin_lock_bh(&state->im->lock); 2565 psf = state->im->sources; 2566 } 2567 out: 2568 return psf; 2569 } 2570 2571 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) 2572 { 2573 struct ip_sf_list *psf = igmp_mcf_get_first(seq); 2574 if (psf) 2575 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) 2576 --pos; 2577 return pos ? NULL : psf; 2578 } 2579 2580 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) 2581 __acquires(rcu) 2582 { 2583 rcu_read_lock(); 2584 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 2585 } 2586 2587 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2588 { 2589 struct ip_sf_list *psf; 2590 if (v == SEQ_START_TOKEN) 2591 psf = igmp_mcf_get_first(seq); 2592 else 2593 psf = igmp_mcf_get_next(seq, v); 2594 ++*pos; 2595 return psf; 2596 } 2597 2598 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) 2599 __releases(rcu) 2600 { 2601 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2602 if (likely(state->im != NULL)) { 2603 spin_unlock_bh(&state->im->lock); 2604 state->im = NULL; 2605 } 2606 if (likely(state->idev != NULL)) { 2607 read_unlock(&state->idev->mc_list_lock); 2608 state->idev = NULL; 2609 } 2610 state->dev = NULL; 2611 rcu_read_unlock(); 2612 } 2613 2614 static int igmp_mcf_seq_show(struct seq_file *seq, void *v) 2615 { 2616 struct ip_sf_list *psf = (struct ip_sf_list *)v; 2617 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); 2618 2619 if (v == SEQ_START_TOKEN) { 2620 seq_printf(seq, 2621 "%3s %6s " 2622 "%10s %10s %6s %6s\n", "Idx", 2623 "Device", "MCA", 2624 "SRC", "INC", "EXC"); 2625 } else { 2626 seq_printf(seq, 2627 "%3d %6.6s 0x%08x " 2628 "0x%08x %6lu %6lu\n", 2629 state->dev->ifindex, state->dev->name, 2630 ntohl(state->im->multiaddr), 2631 ntohl(psf->sf_inaddr), 2632 psf->sf_count[MCAST_INCLUDE], 2633 psf->sf_count[MCAST_EXCLUDE]); 2634 } 2635 return 0; 2636 } 2637 2638 static const struct seq_operations igmp_mcf_seq_ops = { 2639 .start = igmp_mcf_seq_start, 2640 .next = igmp_mcf_seq_next, 2641 .stop = igmp_mcf_seq_stop, 2642 .show = igmp_mcf_seq_show, 2643 }; 2644 2645 static int igmp_mcf_seq_open(struct inode *inode, struct file *file) 2646 { 2647 return seq_open_net(inode, file, &igmp_mcf_seq_ops, 2648 sizeof(struct igmp_mcf_iter_state)); 2649 } 2650 2651 static const struct file_operations igmp_mcf_seq_fops = { 2652 .owner = THIS_MODULE, 2653 .open = igmp_mcf_seq_open, 2654 .read = seq_read, 2655 .llseek = seq_lseek, 2656 .release = seq_release_net, 2657 }; 2658 2659 static int __net_init igmp_net_init(struct net *net) 2660 { 2661 struct proc_dir_entry *pde; 2662 2663 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); 2664 if (!pde) 2665 goto out_igmp; 2666 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); 2667 if (!pde) 2668 goto out_mcfilter; 2669 return 0; 2670 2671 out_mcfilter: 2672 proc_net_remove(net, "igmp"); 2673 out_igmp: 2674 return -ENOMEM; 2675 } 2676 2677 static void __net_exit igmp_net_exit(struct net *net) 2678 { 2679 proc_net_remove(net, "mcfilter"); 2680 proc_net_remove(net, "igmp"); 2681 } 2682 2683 static struct pernet_operations igmp_net_ops = { 2684 .init = igmp_net_init, 2685 .exit = igmp_net_exit, 2686 }; 2687 2688 int __init igmp_mc_proc_init(void) 2689 { 2690 return register_pernet_subsys(&igmp_net_ops); 2691 } 2692 #endif 2693