Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $ |
| 12 | * |
| 13 | * Authors: |
| 14 | * Alan Cox <Alan.Cox@linux.org> |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or |
| 17 | * modify it under the terms of the GNU General Public License |
| 18 | * as published by the Free Software Foundation; either version |
| 19 | * 2 of the License, or (at your option) any later version. |
| 20 | * |
| 21 | * Fixes: |
| 22 | * |
| 23 | * Alan Cox : Added lots of __inline__ to optimise |
| 24 | * the memory usage of all the tiny little |
| 25 | * functions. |
| 26 | * Alan Cox : Dumped the header building experiment. |
| 27 | * Alan Cox : Minor tweaks ready for multicast routing |
| 28 | * and extended IGMP protocol. |
| 29 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 |
| 30 | * writes utterly bogus code otherwise (sigh) |
| 31 | * fixed IGMP loopback to behave in the manner |
| 32 | * desired by mrouted, fixed the fact it has been |
| 33 | * broken since 1.3.6 and cleaned up a few minor |
| 34 | * points. |
| 35 | * |
| 36 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 |
| 37 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu |
| 38 | * The enhancements are mainly based on Steve Deering's |
| 39 | * ipmulti-3.5 source code. |
| 40 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and |
| 41 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of |
| 42 | * the mrouted version on that device. |
| 43 | * Chih-Jen Chang : Added the max_resp_time parameter to |
| 44 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter |
| 45 | * to identify the multicast router version |
| 46 | * and do what the IGMP version 2 specified. |
| 47 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router |
| 48 | * Tsu-Sheng Tsao if the specified time expired. |
| 49 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. |
| 50 | * Alan Cox : Use GFP_ATOMIC in the right places. |
| 51 | * Christian Daudt : igmp timer wasn't set for local group |
| 52 | * memberships but was being deleted, |
| 53 | * which caused a "del_timer() called |
| 54 | * from %p with timer not initialized\n" |
| 55 | * message (960131). |
| 56 | * Christian Daudt : removed del_timer from |
| 57 | * igmp_timer_expire function (960205). |
| 58 | * Christian Daudt : igmp_heard_report now only calls |
| 59 | * igmp_timer_expire if tm->running is |
| 60 | * true (960216). |
| 61 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made |
| 62 | * igmp_heard_query never trigger. Expiry |
| 63 | * miscalculation fixed in igmp_heard_query |
| 64 | * and random() made to return unsigned to |
| 65 | * prevent negative expiry times. |
| 66 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport |
| 67 | * fix from pending 2.1.x patches. |
| 68 | * Alan Cox: Forget to enable FDDI support earlier. |
| 69 | * Alexey Kuznetsov: Fixed leaving groups on device down. |
| 70 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. |
| 71 | * David L Stevens: IGMPv3 support, with help from |
| 72 | * Vinay Kulkarni |
| 73 | */ |
| 74 | |
| 75 | #include <linux/config.h> |
| 76 | #include <linux/module.h> |
| 77 | #include <asm/uaccess.h> |
| 78 | #include <asm/system.h> |
| 79 | #include <linux/types.h> |
| 80 | #include <linux/kernel.h> |
| 81 | #include <linux/jiffies.h> |
| 82 | #include <linux/string.h> |
| 83 | #include <linux/socket.h> |
| 84 | #include <linux/sockios.h> |
| 85 | #include <linux/in.h> |
| 86 | #include <linux/inet.h> |
| 87 | #include <linux/netdevice.h> |
| 88 | #include <linux/skbuff.h> |
| 89 | #include <linux/inetdevice.h> |
| 90 | #include <linux/igmp.h> |
| 91 | #include <linux/if_arp.h> |
| 92 | #include <linux/rtnetlink.h> |
| 93 | #include <linux/times.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 94 | |
| 95 | #include <net/arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #include <net/ip.h> |
| 97 | #include <net/protocol.h> |
| 98 | #include <net/route.h> |
| 99 | #include <net/sock.h> |
| 100 | #include <net/checksum.h> |
| 101 | #include <linux/netfilter_ipv4.h> |
| 102 | #ifdef CONFIG_IP_MROUTE |
| 103 | #include <linux/mroute.h> |
| 104 | #endif |
| 105 | #ifdef CONFIG_PROC_FS |
| 106 | #include <linux/proc_fs.h> |
| 107 | #include <linux/seq_file.h> |
| 108 | #endif |
| 109 | |
| 110 | #define IP_MAX_MEMBERSHIPS 20 |
| 111 | #define IP_MAX_MSF 10 |
| 112 | |
| 113 | #ifdef CONFIG_IP_MULTICAST |
| 114 | /* Parameter names and values are taken from igmp-v2-06 draft */ |
| 115 | |
| 116 | #define IGMP_V1_Router_Present_Timeout (400*HZ) |
| 117 | #define IGMP_V2_Router_Present_Timeout (400*HZ) |
| 118 | #define IGMP_Unsolicited_Report_Interval (10*HZ) |
| 119 | #define IGMP_Query_Response_Interval (10*HZ) |
| 120 | #define IGMP_Unsolicited_Report_Count 2 |
| 121 | |
| 122 | |
| 123 | #define IGMP_Initial_Report_Delay (1) |
| 124 | |
| 125 | /* IGMP_Initial_Report_Delay is not from IGMP specs! |
| 126 | * IGMP specs require to report membership immediately after |
| 127 | * joining a group, but we delay the first report by a |
| 128 | * small interval. It seems more natural and still does not |
| 129 | * contradict to specs provided this delay is small enough. |
| 130 | */ |
| 131 | |
| 132 | #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \ |
| 133 | (in_dev)->cnf.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) (ipv4_devconf.force_igmp_version == 2 || \ |
| 137 | (in_dev)->cnf.force_igmp_version == 2 || \ |
| 138 | ((in_dev)->mr_v2_seen && \ |
| 139 | time_before(jiffies, (in_dev)->mr_v2_seen))) |
| 140 | |
| 141 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
| 142 | static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr); |
| 143 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
| 144 | static int sf_setstate(struct ip_mc_list *pmc); |
| 145 | static void sf_markstate(struct ip_mc_list *pmc); |
| 146 | #endif |
| 147 | static void ip_mc_clear_src(struct ip_mc_list *pmc); |
| 148 | static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, |
| 149 | int sfcount, __u32 *psfsrc, int delta); |
| 150 | |
| 151 | static void ip_ma_put(struct ip_mc_list *im) |
| 152 | { |
| 153 | if (atomic_dec_and_test(&im->refcnt)) { |
| 154 | in_dev_put(im->interface); |
| 155 | kfree(im); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | #ifdef CONFIG_IP_MULTICAST |
| 160 | |
| 161 | /* |
| 162 | * Timer management |
| 163 | */ |
| 164 | |
| 165 | static __inline__ void igmp_stop_timer(struct ip_mc_list *im) |
| 166 | { |
| 167 | spin_lock_bh(&im->lock); |
| 168 | if (del_timer(&im->timer)) |
| 169 | atomic_dec(&im->refcnt); |
| 170 | im->tm_running=0; |
| 171 | im->reporter = 0; |
| 172 | im->unsolicit_count = 0; |
| 173 | spin_unlock_bh(&im->lock); |
| 174 | } |
| 175 | |
| 176 | /* It must be called with locked im->lock */ |
| 177 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) |
| 178 | { |
| 179 | int tv=net_random() % max_delay; |
| 180 | |
| 181 | im->tm_running=1; |
| 182 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
| 183 | atomic_inc(&im->refcnt); |
| 184 | } |
| 185 | |
| 186 | static void igmp_gq_start_timer(struct in_device *in_dev) |
| 187 | { |
| 188 | int tv = net_random() % in_dev->mr_maxdelay; |
| 189 | |
| 190 | in_dev->mr_gq_running = 1; |
| 191 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) |
| 192 | in_dev_hold(in_dev); |
| 193 | } |
| 194 | |
| 195 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) |
| 196 | { |
| 197 | int tv = net_random() % delay; |
| 198 | |
| 199 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) |
| 200 | in_dev_hold(in_dev); |
| 201 | } |
| 202 | |
| 203 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) |
| 204 | { |
| 205 | spin_lock_bh(&im->lock); |
| 206 | im->unsolicit_count = 0; |
| 207 | if (del_timer(&im->timer)) { |
| 208 | if ((long)(im->timer.expires-jiffies) < max_delay) { |
| 209 | add_timer(&im->timer); |
| 210 | im->tm_running=1; |
| 211 | spin_unlock_bh(&im->lock); |
| 212 | return; |
| 213 | } |
| 214 | atomic_dec(&im->refcnt); |
| 215 | } |
| 216 | igmp_start_timer(im, max_delay); |
| 217 | spin_unlock_bh(&im->lock); |
| 218 | } |
| 219 | |
| 220 | |
| 221 | /* |
| 222 | * Send an IGMP report. |
| 223 | */ |
| 224 | |
| 225 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) |
| 226 | |
| 227 | |
| 228 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, |
| 229 | int gdeleted, int sdeleted) |
| 230 | { |
| 231 | switch (type) { |
| 232 | case IGMPV3_MODE_IS_INCLUDE: |
| 233 | case IGMPV3_MODE_IS_EXCLUDE: |
| 234 | if (gdeleted || sdeleted) |
| 235 | return 0; |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 236 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
| 237 | if (pmc->sfmode == MCAST_INCLUDE) |
| 238 | return 1; |
| 239 | /* don't include if this source is excluded |
| 240 | * in all filters |
| 241 | */ |
| 242 | if (psf->sf_count[MCAST_INCLUDE]) |
| 243 | return type == IGMPV3_MODE_IS_INCLUDE; |
| 244 | return pmc->sfcount[MCAST_EXCLUDE] == |
| 245 | psf->sf_count[MCAST_EXCLUDE]; |
| 246 | } |
| 247 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | case IGMPV3_CHANGE_TO_INCLUDE: |
| 249 | if (gdeleted || sdeleted) |
| 250 | return 0; |
| 251 | return psf->sf_count[MCAST_INCLUDE] != 0; |
| 252 | case IGMPV3_CHANGE_TO_EXCLUDE: |
| 253 | if (gdeleted || sdeleted) |
| 254 | return 0; |
| 255 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || |
| 256 | psf->sf_count[MCAST_INCLUDE]) |
| 257 | return 0; |
| 258 | return pmc->sfcount[MCAST_EXCLUDE] == |
| 259 | psf->sf_count[MCAST_EXCLUDE]; |
| 260 | case IGMPV3_ALLOW_NEW_SOURCES: |
| 261 | if (gdeleted || !psf->sf_crcount) |
| 262 | return 0; |
| 263 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; |
| 264 | case IGMPV3_BLOCK_OLD_SOURCES: |
| 265 | if (pmc->sfmode == MCAST_INCLUDE) |
| 266 | return gdeleted || (psf->sf_crcount && sdeleted); |
| 267 | return psf->sf_crcount && !gdeleted && !sdeleted; |
| 268 | } |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static int |
| 273 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) |
| 274 | { |
| 275 | struct ip_sf_list *psf; |
| 276 | int scount = 0; |
| 277 | |
| 278 | for (psf=pmc->sources; psf; psf=psf->sf_next) { |
| 279 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
| 280 | continue; |
| 281 | scount++; |
| 282 | } |
| 283 | return scount; |
| 284 | } |
| 285 | |
| 286 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) |
| 287 | { |
| 288 | struct sk_buff *skb; |
| 289 | struct rtable *rt; |
| 290 | struct iphdr *pip; |
| 291 | struct igmpv3_report *pig; |
| 292 | |
| 293 | skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); |
| 294 | if (skb == NULL) |
| 295 | return NULL; |
| 296 | |
| 297 | { |
| 298 | struct flowi fl = { .oif = dev->ifindex, |
| 299 | .nl_u = { .ip4_u = { |
| 300 | .daddr = IGMPV3_ALL_MCR } }, |
| 301 | .proto = IPPROTO_IGMP }; |
| 302 | if (ip_route_output_key(&rt, &fl)) { |
| 303 | kfree_skb(skb); |
| 304 | return NULL; |
| 305 | } |
| 306 | } |
| 307 | if (rt->rt_src == 0) { |
| 308 | kfree_skb(skb); |
| 309 | ip_rt_put(rt); |
| 310 | return NULL; |
| 311 | } |
| 312 | |
| 313 | skb->dst = &rt->u.dst; |
| 314 | skb->dev = dev; |
| 315 | |
| 316 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 317 | |
| 318 | skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); |
| 319 | |
| 320 | pip->version = 4; |
| 321 | pip->ihl = (sizeof(struct iphdr)+4)>>2; |
| 322 | pip->tos = 0xc0; |
| 323 | pip->frag_off = htons(IP_DF); |
| 324 | pip->ttl = 1; |
| 325 | pip->daddr = rt->rt_dst; |
| 326 | pip->saddr = rt->rt_src; |
| 327 | pip->protocol = IPPROTO_IGMP; |
| 328 | pip->tot_len = 0; /* filled in later */ |
| 329 | ip_select_ident(pip, &rt->u.dst, NULL); |
| 330 | ((u8*)&pip[1])[0] = IPOPT_RA; |
| 331 | ((u8*)&pip[1])[1] = 4; |
| 332 | ((u8*)&pip[1])[2] = 0; |
| 333 | ((u8*)&pip[1])[3] = 0; |
| 334 | |
| 335 | pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); |
| 336 | skb->h.igmph = (struct igmphdr *)pig; |
| 337 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
| 338 | pig->resv1 = 0; |
| 339 | pig->csum = 0; |
| 340 | pig->resv2 = 0; |
| 341 | pig->ngrec = 0; |
| 342 | return skb; |
| 343 | } |
| 344 | |
| 345 | static int igmpv3_sendpack(struct sk_buff *skb) |
| 346 | { |
| 347 | struct iphdr *pip = skb->nh.iph; |
| 348 | struct igmphdr *pig = skb->h.igmph; |
| 349 | int iplen, igmplen; |
| 350 | |
| 351 | iplen = skb->tail - (unsigned char *)skb->nh.iph; |
| 352 | pip->tot_len = htons(iplen); |
| 353 | ip_send_check(pip); |
| 354 | |
| 355 | igmplen = skb->tail - (unsigned char *)skb->h.igmph; |
| 356 | pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); |
| 357 | |
| 358 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, |
| 359 | dst_output); |
| 360 | } |
| 361 | |
| 362 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) |
| 363 | { |
| 364 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); |
| 365 | } |
| 366 | |
| 367 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, |
| 368 | int type, struct igmpv3_grec **ppgr) |
| 369 | { |
| 370 | struct net_device *dev = pmc->interface->dev; |
| 371 | struct igmpv3_report *pih; |
| 372 | struct igmpv3_grec *pgr; |
| 373 | |
| 374 | if (!skb) |
| 375 | skb = igmpv3_newpack(dev, dev->mtu); |
| 376 | if (!skb) |
| 377 | return NULL; |
| 378 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); |
| 379 | pgr->grec_type = type; |
| 380 | pgr->grec_auxwords = 0; |
| 381 | pgr->grec_nsrcs = 0; |
| 382 | pgr->grec_mca = pmc->multiaddr; |
| 383 | pih = (struct igmpv3_report *)skb->h.igmph; |
| 384 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
| 385 | *ppgr = pgr; |
| 386 | return skb; |
| 387 | } |
| 388 | |
| 389 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ |
| 390 | skb_tailroom(skb)) : 0) |
| 391 | |
| 392 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, |
| 393 | int type, int gdeleted, int sdeleted) |
| 394 | { |
| 395 | struct net_device *dev = pmc->interface->dev; |
| 396 | struct igmpv3_report *pih; |
| 397 | struct igmpv3_grec *pgr = NULL; |
| 398 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 399 | int scount, stotal, first, isquery, truncate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
| 401 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
| 402 | return skb; |
| 403 | |
| 404 | isquery = type == IGMPV3_MODE_IS_INCLUDE || |
| 405 | type == IGMPV3_MODE_IS_EXCLUDE; |
| 406 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || |
| 407 | type == IGMPV3_CHANGE_TO_EXCLUDE; |
| 408 | |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 409 | stotal = scount = 0; |
| 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
| 412 | |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 413 | if (!*psf_list) |
| 414 | goto empty_source; |
| 415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL; |
| 417 | |
| 418 | /* EX and TO_EX get a fresh packet, if needed */ |
| 419 | if (truncate) { |
| 420 | if (pih && pih->ngrec && |
| 421 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { |
| 422 | if (skb) |
| 423 | igmpv3_sendpack(skb); |
| 424 | skb = igmpv3_newpack(dev, dev->mtu); |
| 425 | } |
| 426 | } |
| 427 | first = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | psf_prev = NULL; |
| 429 | for (psf=*psf_list; psf; psf=psf_next) { |
| 430 | u32 *psrc; |
| 431 | |
| 432 | psf_next = psf->sf_next; |
| 433 | |
| 434 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { |
| 435 | psf_prev = psf; |
| 436 | continue; |
| 437 | } |
| 438 | |
| 439 | /* clear marks on query responses */ |
| 440 | if (isquery) |
| 441 | psf->sf_gsresp = 0; |
| 442 | |
| 443 | if (AVAILABLE(skb) < sizeof(u32) + |
| 444 | first*sizeof(struct igmpv3_grec)) { |
| 445 | if (truncate && !first) |
| 446 | break; /* truncate these */ |
| 447 | if (pgr) |
| 448 | pgr->grec_nsrcs = htons(scount); |
| 449 | if (skb) |
| 450 | igmpv3_sendpack(skb); |
| 451 | skb = igmpv3_newpack(dev, dev->mtu); |
| 452 | first = 1; |
| 453 | scount = 0; |
| 454 | } |
| 455 | if (first) { |
| 456 | skb = add_grhead(skb, pmc, type, &pgr); |
| 457 | first = 0; |
| 458 | } |
| 459 | psrc = (u32 *)skb_put(skb, sizeof(u32)); |
| 460 | *psrc = psf->sf_inaddr; |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 461 | scount++; stotal++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | if (pmc->sfmode == MCAST_EXCLUDE) { |
| 574 | type = IGMPV3_CHANGE_TO_INCLUDE; |
| 575 | skb = add_grec(skb, pmc, type, 1, 0); |
| 576 | } |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 577 | pmc->crcount--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 615 | pmc->crcount--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | u32 group = pmc ? pmc->multiaddr : 0; |
| 635 | u32 dst; |
| 636 | |
| 637 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) |
| 638 | return igmpv3_send_report(in_dev, pmc); |
| 639 | else if (type == IGMP_HOST_LEAVE_MESSAGE) |
| 640 | dst = IGMP_ALL_ROUTER; |
| 641 | else |
| 642 | dst = group; |
| 643 | |
| 644 | { |
| 645 | struct flowi fl = { .oif = dev->ifindex, |
| 646 | .nl_u = { .ip4_u = { .daddr = dst } }, |
| 647 | .proto = IPPROTO_IGMP }; |
| 648 | if (ip_route_output_key(&rt, &fl)) |
| 649 | return -1; |
| 650 | } |
| 651 | if (rt->rt_src == 0) { |
| 652 | ip_rt_put(rt); |
| 653 | return -1; |
| 654 | } |
| 655 | |
| 656 | skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); |
| 657 | if (skb == NULL) { |
| 658 | ip_rt_put(rt); |
| 659 | return -1; |
| 660 | } |
| 661 | |
| 662 | skb->dst = &rt->u.dst; |
| 663 | |
| 664 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 665 | |
| 666 | skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); |
| 667 | |
| 668 | iph->version = 4; |
| 669 | iph->ihl = (sizeof(struct iphdr)+4)>>2; |
| 670 | iph->tos = 0xc0; |
| 671 | iph->frag_off = htons(IP_DF); |
| 672 | iph->ttl = 1; |
| 673 | iph->daddr = dst; |
| 674 | iph->saddr = rt->rt_src; |
| 675 | iph->protocol = IPPROTO_IGMP; |
| 676 | iph->tot_len = htons(IGMP_SIZE); |
| 677 | ip_select_ident(iph, &rt->u.dst, NULL); |
| 678 | ((u8*)&iph[1])[0] = IPOPT_RA; |
| 679 | ((u8*)&iph[1])[1] = 4; |
| 680 | ((u8*)&iph[1])[2] = 0; |
| 681 | ((u8*)&iph[1])[3] = 0; |
| 682 | ip_send_check(iph); |
| 683 | |
| 684 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
| 685 | ih->type=type; |
| 686 | ih->code=0; |
| 687 | ih->csum=0; |
| 688 | ih->group=group; |
| 689 | ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); |
| 690 | |
| 691 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, |
| 692 | dst_output); |
| 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 | |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 751 | /* mark EXCLUDE-mode sources */ |
| 752 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 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, __u32 *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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 799 | if (!scount) { |
| 800 | pmc->gsquery = 0; |
| 801 | return 0; |
| 802 | } |
| 803 | pmc->gsquery = 1; |
| 804 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | } |
| 806 | |
| 807 | static void igmp_heard_report(struct in_device *in_dev, u32 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 = skb->h.igmph; |
| 830 | struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; |
| 831 | struct ip_mc_list *im; |
| 832 | u32 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 { /* v3 */ |
| 860 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) |
| 861 | return; |
| 862 | |
| 863 | ih3 = (struct igmpv3_query *) skb->h.raw; |
| 864 | if (ih3->nsrcs) { |
| 865 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
| 866 | + ntohs(ih3->nsrcs)*sizeof(__u32))) |
| 867 | return; |
| 868 | ih3 = (struct igmpv3_query *) skb->h.raw; |
| 869 | } |
| 870 | |
| 871 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); |
| 872 | if (!max_delay) |
| 873 | max_delay = 1; /* can't mod w/ 0 */ |
| 874 | in_dev->mr_maxdelay = max_delay; |
| 875 | if (ih3->qrv) |
| 876 | in_dev->mr_qrv = ih3->qrv; |
| 877 | if (!group) { /* general query */ |
| 878 | if (ih3->nsrcs) |
| 879 | return; /* no sources allowed */ |
| 880 | igmp_gq_start_timer(in_dev); |
| 881 | return; |
| 882 | } |
| 883 | /* mark sources to include, if group & source-specific */ |
| 884 | mark = ih3->nsrcs != 0; |
| 885 | } |
| 886 | |
| 887 | /* |
| 888 | * - Start the timers in all of our membership records |
| 889 | * that the query applies to for the interface on |
| 890 | * which the query arrived excl. those that belong |
| 891 | * to a "local" group (224.0.0.X) |
| 892 | * - For timers already running check if they need to |
| 893 | * be reset. |
| 894 | * - Use the igmp->igmp_code field as the maximum |
| 895 | * delay possible |
| 896 | */ |
| 897 | read_lock(&in_dev->mc_list_lock); |
| 898 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 899 | int changed; |
| 900 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | if (group && group != im->multiaddr) |
| 902 | continue; |
| 903 | if (im->multiaddr == IGMP_ALL_HOSTS) |
| 904 | continue; |
| 905 | spin_lock_bh(&im->lock); |
| 906 | if (im->tm_running) |
| 907 | im->gsquery = im->gsquery && mark; |
| 908 | else |
| 909 | im->gsquery = mark; |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 910 | changed = !im->gsquery || |
| 911 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | spin_unlock_bh(&im->lock); |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 913 | if (changed) |
| 914 | igmp_mod_timer(im, max_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | } |
| 916 | read_unlock(&in_dev->mc_list_lock); |
| 917 | } |
| 918 | |
| 919 | int igmp_rcv(struct sk_buff *skb) |
| 920 | { |
| 921 | /* This basically follows the spec line by line -- see RFC1112 */ |
| 922 | struct igmphdr *ih; |
| 923 | struct in_device *in_dev = in_dev_get(skb->dev); |
| 924 | int len = skb->len; |
| 925 | |
| 926 | if (in_dev==NULL) { |
| 927 | kfree_skb(skb); |
| 928 | return 0; |
| 929 | } |
| 930 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 931 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
| 932 | goto drop; |
| 933 | |
| 934 | switch (skb->ip_summed) { |
| 935 | case CHECKSUM_HW: |
| 936 | if (!(u16)csum_fold(skb->csum)) |
| 937 | break; |
| 938 | /* fall through */ |
| 939 | case CHECKSUM_NONE: |
| 940 | skb->csum = 0; |
| 941 | if (__skb_checksum_complete(skb)) |
| 942 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
| 944 | |
| 945 | ih = skb->h.igmph; |
| 946 | switch (ih->type) { |
| 947 | case IGMP_HOST_MEMBERSHIP_QUERY: |
| 948 | igmp_heard_query(in_dev, skb, len); |
| 949 | break; |
| 950 | case IGMP_HOST_MEMBERSHIP_REPORT: |
| 951 | case IGMPV2_HOST_MEMBERSHIP_REPORT: |
| 952 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
| 953 | /* Is it our report looped back? */ |
| 954 | if (((struct rtable*)skb->dst)->fl.iif == 0) |
| 955 | break; |
David Stevens | 24c6927 | 2005-12-02 20:32:59 -0800 | [diff] [blame] | 956 | /* don't rely on MC router hearing unicast reports */ |
| 957 | if (skb->pkt_type == PACKET_MULTICAST || |
| 958 | skb->pkt_type == PACKET_BROADCAST) |
| 959 | igmp_heard_report(in_dev, ih->group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | break; |
| 961 | case IGMP_PIM: |
| 962 | #ifdef CONFIG_IP_PIMSM_V1 |
| 963 | in_dev_put(in_dev); |
| 964 | return pim_rcv_v1(skb); |
| 965 | #endif |
| 966 | case IGMP_DVMRP: |
| 967 | case IGMP_TRACE: |
| 968 | case IGMP_HOST_LEAVE_MESSAGE: |
| 969 | case IGMP_MTRACE: |
| 970 | case IGMP_MTRACE_RESP: |
| 971 | break; |
| 972 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 974 | |
| 975 | drop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | in_dev_put(in_dev); |
| 977 | kfree_skb(skb); |
| 978 | return 0; |
| 979 | } |
| 980 | |
| 981 | #endif |
| 982 | |
| 983 | |
| 984 | /* |
| 985 | * Add a filter to a device |
| 986 | */ |
| 987 | |
| 988 | static void ip_mc_filter_add(struct in_device *in_dev, u32 addr) |
| 989 | { |
| 990 | char buf[MAX_ADDR_LEN]; |
| 991 | struct net_device *dev = in_dev->dev; |
| 992 | |
| 993 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. |
| 994 | We will get multicast token leakage, when IFF_MULTICAST |
| 995 | is changed. This check should be done in dev->set_multicast_list |
| 996 | routine. Something sort of: |
| 997 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } |
| 998 | --ANK |
| 999 | */ |
| 1000 | if (arp_mc_map(addr, buf, dev, 0) == 0) |
| 1001 | dev_mc_add(dev,buf,dev->addr_len,0); |
| 1002 | } |
| 1003 | |
| 1004 | /* |
| 1005 | * Remove a filter from a device |
| 1006 | */ |
| 1007 | |
| 1008 | static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) |
| 1009 | { |
| 1010 | char buf[MAX_ADDR_LEN]; |
| 1011 | struct net_device *dev = in_dev->dev; |
| 1012 | |
| 1013 | if (arp_mc_map(addr, buf, dev, 0) == 0) |
| 1014 | dev_mc_delete(dev,buf,dev->addr_len,0); |
| 1015 | } |
| 1016 | |
| 1017 | #ifdef CONFIG_IP_MULTICAST |
| 1018 | /* |
| 1019 | * deleted ip_mc_list manipulation |
| 1020 | */ |
| 1021 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) |
| 1022 | { |
| 1023 | struct ip_mc_list *pmc; |
| 1024 | |
| 1025 | /* this is an "ip_mc_list" for convenience; only the fields below |
| 1026 | * are actually used. In particular, the refcnt and users are not |
| 1027 | * used for management of the delete list. Using the same structure |
| 1028 | * for deleted items allows change reports to use common code with |
| 1029 | * non-deleted or query-response MCA's. |
| 1030 | */ |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1031 | pmc = kmalloc(sizeof(*pmc), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | if (!pmc) |
| 1033 | return; |
| 1034 | memset(pmc, 0, sizeof(*pmc)); |
| 1035 | spin_lock_bh(&im->lock); |
| 1036 | pmc->interface = im->interface; |
| 1037 | in_dev_hold(in_dev); |
| 1038 | pmc->multiaddr = im->multiaddr; |
| 1039 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
| 1040 | IGMP_Unsolicited_Report_Count; |
| 1041 | pmc->sfmode = im->sfmode; |
| 1042 | if (pmc->sfmode == MCAST_INCLUDE) { |
| 1043 | struct ip_sf_list *psf; |
| 1044 | |
| 1045 | pmc->tomb = im->tomb; |
| 1046 | pmc->sources = im->sources; |
| 1047 | im->tomb = im->sources = NULL; |
| 1048 | for (psf=pmc->sources; psf; psf=psf->sf_next) |
| 1049 | psf->sf_crcount = pmc->crcount; |
| 1050 | } |
| 1051 | spin_unlock_bh(&im->lock); |
| 1052 | |
| 1053 | spin_lock_bh(&in_dev->mc_tomb_lock); |
| 1054 | pmc->next = in_dev->mc_tomb; |
| 1055 | in_dev->mc_tomb = pmc; |
| 1056 | spin_unlock_bh(&in_dev->mc_tomb_lock); |
| 1057 | } |
| 1058 | |
| 1059 | static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) |
| 1060 | { |
| 1061 | struct ip_mc_list *pmc, *pmc_prev; |
| 1062 | struct ip_sf_list *psf, *psf_next; |
| 1063 | |
| 1064 | spin_lock_bh(&in_dev->mc_tomb_lock); |
| 1065 | pmc_prev = NULL; |
| 1066 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { |
| 1067 | if (pmc->multiaddr == multiaddr) |
| 1068 | break; |
| 1069 | pmc_prev = pmc; |
| 1070 | } |
| 1071 | if (pmc) { |
| 1072 | if (pmc_prev) |
| 1073 | pmc_prev->next = pmc->next; |
| 1074 | else |
| 1075 | in_dev->mc_tomb = pmc->next; |
| 1076 | } |
| 1077 | spin_unlock_bh(&in_dev->mc_tomb_lock); |
| 1078 | if (pmc) { |
| 1079 | for (psf=pmc->tomb; psf; psf=psf_next) { |
| 1080 | psf_next = psf->sf_next; |
| 1081 | kfree(psf); |
| 1082 | } |
| 1083 | in_dev_put(pmc->interface); |
| 1084 | kfree(pmc); |
| 1085 | } |
| 1086 | } |
| 1087 | |
| 1088 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
| 1089 | { |
| 1090 | struct ip_mc_list *pmc, *nextpmc; |
| 1091 | |
| 1092 | spin_lock_bh(&in_dev->mc_tomb_lock); |
| 1093 | pmc = in_dev->mc_tomb; |
| 1094 | in_dev->mc_tomb = NULL; |
| 1095 | spin_unlock_bh(&in_dev->mc_tomb_lock); |
| 1096 | |
| 1097 | for (; pmc; pmc = nextpmc) { |
| 1098 | nextpmc = pmc->next; |
| 1099 | ip_mc_clear_src(pmc); |
| 1100 | in_dev_put(pmc->interface); |
| 1101 | kfree(pmc); |
| 1102 | } |
| 1103 | /* clear dead sources, too */ |
| 1104 | read_lock(&in_dev->mc_list_lock); |
| 1105 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { |
| 1106 | struct ip_sf_list *psf, *psf_next; |
| 1107 | |
| 1108 | spin_lock_bh(&pmc->lock); |
| 1109 | psf = pmc->tomb; |
| 1110 | pmc->tomb = NULL; |
| 1111 | spin_unlock_bh(&pmc->lock); |
| 1112 | for (; psf; psf=psf_next) { |
| 1113 | psf_next = psf->sf_next; |
| 1114 | kfree(psf); |
| 1115 | } |
| 1116 | } |
| 1117 | read_unlock(&in_dev->mc_list_lock); |
| 1118 | } |
| 1119 | #endif |
| 1120 | |
| 1121 | static void igmp_group_dropped(struct ip_mc_list *im) |
| 1122 | { |
| 1123 | struct in_device *in_dev = im->interface; |
| 1124 | #ifdef CONFIG_IP_MULTICAST |
| 1125 | int reporter; |
| 1126 | #endif |
| 1127 | |
| 1128 | if (im->loaded) { |
| 1129 | im->loaded = 0; |
| 1130 | ip_mc_filter_del(in_dev, im->multiaddr); |
| 1131 | } |
| 1132 | |
| 1133 | #ifdef CONFIG_IP_MULTICAST |
| 1134 | if (im->multiaddr == IGMP_ALL_HOSTS) |
| 1135 | return; |
| 1136 | |
| 1137 | reporter = im->reporter; |
| 1138 | igmp_stop_timer(im); |
| 1139 | |
| 1140 | if (!in_dev->dead) { |
| 1141 | if (IGMP_V1_SEEN(in_dev)) |
| 1142 | goto done; |
| 1143 | if (IGMP_V2_SEEN(in_dev)) { |
| 1144 | if (reporter) |
| 1145 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); |
| 1146 | goto done; |
| 1147 | } |
| 1148 | /* IGMPv3 */ |
| 1149 | igmpv3_add_delrec(in_dev, im); |
| 1150 | |
| 1151 | igmp_ifc_event(in_dev); |
| 1152 | } |
| 1153 | done: |
| 1154 | #endif |
| 1155 | ip_mc_clear_src(im); |
| 1156 | } |
| 1157 | |
| 1158 | static void igmp_group_added(struct ip_mc_list *im) |
| 1159 | { |
| 1160 | struct in_device *in_dev = im->interface; |
| 1161 | |
| 1162 | if (im->loaded == 0) { |
| 1163 | im->loaded = 1; |
| 1164 | ip_mc_filter_add(in_dev, im->multiaddr); |
| 1165 | } |
| 1166 | |
| 1167 | #ifdef CONFIG_IP_MULTICAST |
| 1168 | if (im->multiaddr == IGMP_ALL_HOSTS) |
| 1169 | return; |
| 1170 | |
| 1171 | if (in_dev->dead) |
| 1172 | return; |
| 1173 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { |
| 1174 | spin_lock_bh(&im->lock); |
| 1175 | igmp_start_timer(im, IGMP_Initial_Report_Delay); |
| 1176 | spin_unlock_bh(&im->lock); |
| 1177 | return; |
| 1178 | } |
| 1179 | /* else, v3 */ |
| 1180 | |
| 1181 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
| 1182 | IGMP_Unsolicited_Report_Count; |
| 1183 | igmp_ifc_event(in_dev); |
| 1184 | #endif |
| 1185 | } |
| 1186 | |
| 1187 | |
| 1188 | /* |
| 1189 | * Multicast list managers |
| 1190 | */ |
| 1191 | |
| 1192 | |
| 1193 | /* |
| 1194 | * A socket has joined a multicast group on device dev. |
| 1195 | */ |
| 1196 | |
| 1197 | void ip_mc_inc_group(struct in_device *in_dev, u32 addr) |
| 1198 | { |
| 1199 | struct ip_mc_list *im; |
| 1200 | |
| 1201 | ASSERT_RTNL(); |
| 1202 | |
| 1203 | for (im=in_dev->mc_list; im; im=im->next) { |
| 1204 | if (im->multiaddr == addr) { |
| 1205 | im->users++; |
| 1206 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); |
| 1207 | goto out; |
| 1208 | } |
| 1209 | } |
| 1210 | |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1211 | im = kmalloc(sizeof(*im), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | if (!im) |
| 1213 | goto out; |
| 1214 | |
| 1215 | im->users=1; |
| 1216 | im->interface=in_dev; |
| 1217 | in_dev_hold(in_dev); |
| 1218 | im->multiaddr=addr; |
| 1219 | /* initial mode is (EX, empty) */ |
| 1220 | im->sfmode = MCAST_EXCLUDE; |
| 1221 | im->sfcount[MCAST_INCLUDE] = 0; |
| 1222 | im->sfcount[MCAST_EXCLUDE] = 1; |
| 1223 | im->sources = NULL; |
| 1224 | im->tomb = NULL; |
| 1225 | im->crcount = 0; |
| 1226 | atomic_set(&im->refcnt, 1); |
| 1227 | spin_lock_init(&im->lock); |
| 1228 | #ifdef CONFIG_IP_MULTICAST |
| 1229 | im->tm_running=0; |
| 1230 | init_timer(&im->timer); |
| 1231 | im->timer.data=(unsigned long)im; |
| 1232 | im->timer.function=&igmp_timer_expire; |
| 1233 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
| 1234 | im->reporter = 0; |
| 1235 | im->gsquery = 0; |
| 1236 | #endif |
| 1237 | im->loaded = 0; |
| 1238 | write_lock_bh(&in_dev->mc_list_lock); |
| 1239 | im->next=in_dev->mc_list; |
| 1240 | in_dev->mc_list=im; |
| 1241 | write_unlock_bh(&in_dev->mc_list_lock); |
| 1242 | #ifdef CONFIG_IP_MULTICAST |
| 1243 | igmpv3_del_delrec(in_dev, im->multiaddr); |
| 1244 | #endif |
| 1245 | igmp_group_added(im); |
| 1246 | if (!in_dev->dead) |
| 1247 | ip_rt_multicast_event(in_dev); |
| 1248 | out: |
| 1249 | return; |
| 1250 | } |
| 1251 | |
| 1252 | /* |
| 1253 | * A socket has left a multicast group on device dev |
| 1254 | */ |
| 1255 | |
| 1256 | void ip_mc_dec_group(struct in_device *in_dev, u32 addr) |
| 1257 | { |
| 1258 | struct ip_mc_list *i, **ip; |
| 1259 | |
| 1260 | ASSERT_RTNL(); |
| 1261 | |
| 1262 | for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { |
| 1263 | if (i->multiaddr==addr) { |
| 1264 | if (--i->users == 0) { |
| 1265 | write_lock_bh(&in_dev->mc_list_lock); |
| 1266 | *ip = i->next; |
| 1267 | write_unlock_bh(&in_dev->mc_list_lock); |
| 1268 | igmp_group_dropped(i); |
| 1269 | |
| 1270 | if (!in_dev->dead) |
| 1271 | ip_rt_multicast_event(in_dev); |
| 1272 | |
| 1273 | ip_ma_put(i); |
| 1274 | return; |
| 1275 | } |
| 1276 | break; |
| 1277 | } |
| 1278 | } |
| 1279 | } |
| 1280 | |
| 1281 | /* Device going down */ |
| 1282 | |
| 1283 | void ip_mc_down(struct in_device *in_dev) |
| 1284 | { |
| 1285 | struct ip_mc_list *i; |
| 1286 | |
| 1287 | ASSERT_RTNL(); |
| 1288 | |
| 1289 | for (i=in_dev->mc_list; i; i=i->next) |
| 1290 | igmp_group_dropped(i); |
| 1291 | |
| 1292 | #ifdef CONFIG_IP_MULTICAST |
| 1293 | in_dev->mr_ifc_count = 0; |
| 1294 | if (del_timer(&in_dev->mr_ifc_timer)) |
| 1295 | __in_dev_put(in_dev); |
| 1296 | in_dev->mr_gq_running = 0; |
| 1297 | if (del_timer(&in_dev->mr_gq_timer)) |
| 1298 | __in_dev_put(in_dev); |
| 1299 | igmpv3_clear_delrec(in_dev); |
| 1300 | #endif |
| 1301 | |
| 1302 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); |
| 1303 | } |
| 1304 | |
| 1305 | void ip_mc_init_dev(struct in_device *in_dev) |
| 1306 | { |
| 1307 | ASSERT_RTNL(); |
| 1308 | |
| 1309 | in_dev->mc_tomb = NULL; |
| 1310 | #ifdef CONFIG_IP_MULTICAST |
| 1311 | in_dev->mr_gq_running = 0; |
| 1312 | init_timer(&in_dev->mr_gq_timer); |
| 1313 | in_dev->mr_gq_timer.data=(unsigned long) in_dev; |
| 1314 | in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; |
| 1315 | in_dev->mr_ifc_count = 0; |
| 1316 | init_timer(&in_dev->mr_ifc_timer); |
| 1317 | in_dev->mr_ifc_timer.data=(unsigned long) in_dev; |
| 1318 | in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; |
| 1319 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
| 1320 | #endif |
| 1321 | |
| 1322 | rwlock_init(&in_dev->mc_list_lock); |
| 1323 | spin_lock_init(&in_dev->mc_tomb_lock); |
| 1324 | } |
| 1325 | |
| 1326 | /* Device going up */ |
| 1327 | |
| 1328 | void ip_mc_up(struct in_device *in_dev) |
| 1329 | { |
| 1330 | struct ip_mc_list *i; |
| 1331 | |
| 1332 | ASSERT_RTNL(); |
| 1333 | |
| 1334 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
| 1335 | |
| 1336 | for (i=in_dev->mc_list; i; i=i->next) |
| 1337 | igmp_group_added(i); |
| 1338 | } |
| 1339 | |
| 1340 | /* |
| 1341 | * Device is about to be destroyed: clean up. |
| 1342 | */ |
| 1343 | |
| 1344 | void ip_mc_destroy_dev(struct in_device *in_dev) |
| 1345 | { |
| 1346 | struct ip_mc_list *i; |
| 1347 | |
| 1348 | ASSERT_RTNL(); |
| 1349 | |
| 1350 | /* Deactivate timers */ |
| 1351 | ip_mc_down(in_dev); |
| 1352 | |
| 1353 | write_lock_bh(&in_dev->mc_list_lock); |
| 1354 | while ((i = in_dev->mc_list) != NULL) { |
| 1355 | in_dev->mc_list = i->next; |
| 1356 | write_unlock_bh(&in_dev->mc_list_lock); |
| 1357 | |
| 1358 | igmp_group_dropped(i); |
| 1359 | ip_ma_put(i); |
| 1360 | |
| 1361 | write_lock_bh(&in_dev->mc_list_lock); |
| 1362 | } |
| 1363 | write_unlock_bh(&in_dev->mc_list_lock); |
| 1364 | } |
| 1365 | |
| 1366 | static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) |
| 1367 | { |
| 1368 | struct flowi fl = { .nl_u = { .ip4_u = |
| 1369 | { .daddr = imr->imr_multiaddr.s_addr } } }; |
| 1370 | struct rtable *rt; |
| 1371 | struct net_device *dev = NULL; |
| 1372 | struct in_device *idev = NULL; |
| 1373 | |
| 1374 | if (imr->imr_ifindex) { |
| 1375 | idev = inetdev_by_index(imr->imr_ifindex); |
| 1376 | if (idev) |
| 1377 | __in_dev_put(idev); |
| 1378 | return idev; |
| 1379 | } |
| 1380 | if (imr->imr_address.s_addr) { |
| 1381 | dev = ip_dev_find(imr->imr_address.s_addr); |
| 1382 | if (!dev) |
| 1383 | return NULL; |
| 1384 | __dev_put(dev); |
| 1385 | } |
| 1386 | |
| 1387 | if (!dev && !ip_route_output_key(&rt, &fl)) { |
| 1388 | dev = rt->u.dst.dev; |
| 1389 | ip_rt_put(rt); |
| 1390 | } |
| 1391 | if (dev) { |
| 1392 | imr->imr_ifindex = dev->ifindex; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1393 | idev = __in_dev_get_rtnl(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | } |
| 1395 | return idev; |
| 1396 | } |
| 1397 | |
| 1398 | /* |
| 1399 | * Join a socket to a group |
| 1400 | */ |
| 1401 | int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; |
| 1402 | int sysctl_igmp_max_msf = IP_MAX_MSF; |
| 1403 | |
| 1404 | |
| 1405 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, |
| 1406 | __u32 *psfsrc) |
| 1407 | { |
| 1408 | struct ip_sf_list *psf, *psf_prev; |
| 1409 | int rv = 0; |
| 1410 | |
| 1411 | psf_prev = NULL; |
| 1412 | for (psf=pmc->sources; psf; psf=psf->sf_next) { |
| 1413 | if (psf->sf_inaddr == *psfsrc) |
| 1414 | break; |
| 1415 | psf_prev = psf; |
| 1416 | } |
| 1417 | if (!psf || psf->sf_count[sfmode] == 0) { |
| 1418 | /* source filter not found, or count wrong => bug */ |
| 1419 | return -ESRCH; |
| 1420 | } |
| 1421 | psf->sf_count[sfmode]--; |
| 1422 | if (psf->sf_count[sfmode] == 0) { |
| 1423 | ip_rt_multicast_event(pmc->interface); |
| 1424 | } |
| 1425 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { |
| 1426 | #ifdef CONFIG_IP_MULTICAST |
| 1427 | struct in_device *in_dev = pmc->interface; |
| 1428 | #endif |
| 1429 | |
| 1430 | /* no more filters for this source */ |
| 1431 | if (psf_prev) |
| 1432 | psf_prev->sf_next = psf->sf_next; |
| 1433 | else |
| 1434 | pmc->sources = psf->sf_next; |
| 1435 | #ifdef CONFIG_IP_MULTICAST |
| 1436 | if (psf->sf_oldin && |
| 1437 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { |
| 1438 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
| 1439 | IGMP_Unsolicited_Report_Count; |
| 1440 | psf->sf_next = pmc->tomb; |
| 1441 | pmc->tomb = psf; |
| 1442 | rv = 1; |
| 1443 | } else |
| 1444 | #endif |
| 1445 | kfree(psf); |
| 1446 | } |
| 1447 | return rv; |
| 1448 | } |
| 1449 | |
| 1450 | #ifndef CONFIG_IP_MULTICAST |
| 1451 | #define igmp_ifc_event(x) do { } while (0) |
| 1452 | #endif |
| 1453 | |
| 1454 | static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode, |
| 1455 | int sfcount, __u32 *psfsrc, int delta) |
| 1456 | { |
| 1457 | struct ip_mc_list *pmc; |
| 1458 | int changerec = 0; |
| 1459 | int i, err; |
| 1460 | |
| 1461 | if (!in_dev) |
| 1462 | return -ENODEV; |
| 1463 | read_lock(&in_dev->mc_list_lock); |
| 1464 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { |
| 1465 | if (*pmca == pmc->multiaddr) |
| 1466 | break; |
| 1467 | } |
| 1468 | if (!pmc) { |
| 1469 | /* MCA not found?? bug */ |
| 1470 | read_unlock(&in_dev->mc_list_lock); |
| 1471 | return -ESRCH; |
| 1472 | } |
| 1473 | spin_lock_bh(&pmc->lock); |
| 1474 | read_unlock(&in_dev->mc_list_lock); |
| 1475 | #ifdef CONFIG_IP_MULTICAST |
| 1476 | sf_markstate(pmc); |
| 1477 | #endif |
| 1478 | if (!delta) { |
| 1479 | err = -EINVAL; |
| 1480 | if (!pmc->sfcount[sfmode]) |
| 1481 | goto out_unlock; |
| 1482 | pmc->sfcount[sfmode]--; |
| 1483 | } |
| 1484 | err = 0; |
| 1485 | for (i=0; i<sfcount; i++) { |
| 1486 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
| 1487 | |
| 1488 | changerec |= rv > 0; |
| 1489 | if (!err && rv < 0) |
| 1490 | err = rv; |
| 1491 | } |
| 1492 | if (pmc->sfmode == MCAST_EXCLUDE && |
| 1493 | pmc->sfcount[MCAST_EXCLUDE] == 0 && |
| 1494 | pmc->sfcount[MCAST_INCLUDE]) { |
| 1495 | #ifdef CONFIG_IP_MULTICAST |
| 1496 | struct ip_sf_list *psf; |
| 1497 | #endif |
| 1498 | |
| 1499 | /* filter mode change */ |
| 1500 | pmc->sfmode = MCAST_INCLUDE; |
| 1501 | #ifdef CONFIG_IP_MULTICAST |
| 1502 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
| 1503 | IGMP_Unsolicited_Report_Count; |
| 1504 | in_dev->mr_ifc_count = pmc->crcount; |
| 1505 | for (psf=pmc->sources; psf; psf = psf->sf_next) |
| 1506 | psf->sf_crcount = 0; |
| 1507 | igmp_ifc_event(pmc->interface); |
| 1508 | } else if (sf_setstate(pmc) || changerec) { |
| 1509 | igmp_ifc_event(pmc->interface); |
| 1510 | #endif |
| 1511 | } |
| 1512 | out_unlock: |
| 1513 | spin_unlock_bh(&pmc->lock); |
| 1514 | return err; |
| 1515 | } |
| 1516 | |
| 1517 | /* |
| 1518 | * Add multicast single-source filter to the interface list |
| 1519 | */ |
| 1520 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, |
| 1521 | __u32 *psfsrc, int delta) |
| 1522 | { |
| 1523 | struct ip_sf_list *psf, *psf_prev; |
| 1524 | |
| 1525 | psf_prev = NULL; |
| 1526 | for (psf=pmc->sources; psf; psf=psf->sf_next) { |
| 1527 | if (psf->sf_inaddr == *psfsrc) |
| 1528 | break; |
| 1529 | psf_prev = psf; |
| 1530 | } |
| 1531 | if (!psf) { |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1532 | psf = kmalloc(sizeof(*psf), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | if (!psf) |
| 1534 | return -ENOBUFS; |
| 1535 | memset(psf, 0, sizeof(*psf)); |
| 1536 | psf->sf_inaddr = *psfsrc; |
| 1537 | if (psf_prev) { |
| 1538 | psf_prev->sf_next = psf; |
| 1539 | } else |
| 1540 | pmc->sources = psf; |
| 1541 | } |
| 1542 | psf->sf_count[sfmode]++; |
| 1543 | if (psf->sf_count[sfmode] == 1) { |
| 1544 | ip_rt_multicast_event(pmc->interface); |
| 1545 | } |
| 1546 | return 0; |
| 1547 | } |
| 1548 | |
| 1549 | #ifdef CONFIG_IP_MULTICAST |
| 1550 | static void sf_markstate(struct ip_mc_list *pmc) |
| 1551 | { |
| 1552 | struct ip_sf_list *psf; |
| 1553 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
| 1554 | |
| 1555 | for (psf=pmc->sources; psf; psf=psf->sf_next) |
| 1556 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
| 1557 | psf->sf_oldin = mca_xcount == |
| 1558 | psf->sf_count[MCAST_EXCLUDE] && |
| 1559 | !psf->sf_count[MCAST_INCLUDE]; |
| 1560 | } else |
| 1561 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; |
| 1562 | } |
| 1563 | |
| 1564 | static int sf_setstate(struct ip_mc_list *pmc) |
| 1565 | { |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 1566 | struct ip_sf_list *psf, *dpsf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
| 1568 | int qrv = pmc->interface->mr_qrv; |
| 1569 | int new_in, rv; |
| 1570 | |
| 1571 | rv = 0; |
| 1572 | for (psf=pmc->sources; psf; psf=psf->sf_next) { |
| 1573 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
| 1574 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && |
| 1575 | !psf->sf_count[MCAST_INCLUDE]; |
| 1576 | } else |
| 1577 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; |
David L Stevens | ad12583 | 2006-01-18 14:20:56 -0800 | [diff] [blame] | 1578 | if (new_in) { |
| 1579 | if (!psf->sf_oldin) { |
| 1580 | struct ip_sf_list *prev = 0; |
| 1581 | |
| 1582 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { |
| 1583 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
| 1584 | break; |
| 1585 | prev = dpsf; |
| 1586 | } |
| 1587 | if (dpsf) { |
| 1588 | if (prev) |
| 1589 | prev->sf_next = dpsf->sf_next; |
| 1590 | else |
| 1591 | pmc->tomb = dpsf->sf_next; |
| 1592 | kfree(dpsf); |
| 1593 | } |
| 1594 | psf->sf_crcount = qrv; |
| 1595 | rv++; |
| 1596 | } |
| 1597 | } else if (psf->sf_oldin) { |
| 1598 | |
| 1599 | psf->sf_crcount = 0; |
| 1600 | /* |
| 1601 | * add or update "delete" records if an active filter |
| 1602 | * is now inactive |
| 1603 | */ |
| 1604 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) |
| 1605 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
| 1606 | break; |
| 1607 | if (!dpsf) { |
| 1608 | dpsf = (struct ip_sf_list *) |
| 1609 | kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
| 1610 | if (!dpsf) |
| 1611 | continue; |
| 1612 | *dpsf = *psf; |
| 1613 | /* pmc->lock held by callers */ |
| 1614 | dpsf->sf_next = pmc->tomb; |
| 1615 | pmc->tomb = dpsf; |
| 1616 | } |
| 1617 | dpsf->sf_crcount = qrv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | rv++; |
| 1619 | } |
| 1620 | } |
| 1621 | return rv; |
| 1622 | } |
| 1623 | #endif |
| 1624 | |
| 1625 | /* |
| 1626 | * Add multicast source filter list to the interface list |
| 1627 | */ |
| 1628 | static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, |
| 1629 | int sfcount, __u32 *psfsrc, int delta) |
| 1630 | { |
| 1631 | struct ip_mc_list *pmc; |
| 1632 | int isexclude; |
| 1633 | int i, err; |
| 1634 | |
| 1635 | if (!in_dev) |
| 1636 | return -ENODEV; |
| 1637 | read_lock(&in_dev->mc_list_lock); |
| 1638 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { |
| 1639 | if (*pmca == pmc->multiaddr) |
| 1640 | break; |
| 1641 | } |
| 1642 | if (!pmc) { |
| 1643 | /* MCA not found?? bug */ |
| 1644 | read_unlock(&in_dev->mc_list_lock); |
| 1645 | return -ESRCH; |
| 1646 | } |
| 1647 | spin_lock_bh(&pmc->lock); |
| 1648 | read_unlock(&in_dev->mc_list_lock); |
| 1649 | |
| 1650 | #ifdef CONFIG_IP_MULTICAST |
| 1651 | sf_markstate(pmc); |
| 1652 | #endif |
| 1653 | isexclude = pmc->sfmode == MCAST_EXCLUDE; |
| 1654 | if (!delta) |
| 1655 | pmc->sfcount[sfmode]++; |
| 1656 | err = 0; |
| 1657 | for (i=0; i<sfcount; i++) { |
| 1658 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); |
| 1659 | if (err) |
| 1660 | break; |
| 1661 | } |
| 1662 | if (err) { |
| 1663 | int j; |
| 1664 | |
| 1665 | pmc->sfcount[sfmode]--; |
| 1666 | for (j=0; j<i; j++) |
| 1667 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
| 1668 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
| 1669 | #ifdef CONFIG_IP_MULTICAST |
| 1670 | struct in_device *in_dev = pmc->interface; |
| 1671 | struct ip_sf_list *psf; |
| 1672 | #endif |
| 1673 | |
| 1674 | /* filter mode change */ |
| 1675 | if (pmc->sfcount[MCAST_EXCLUDE]) |
| 1676 | pmc->sfmode = MCAST_EXCLUDE; |
| 1677 | else if (pmc->sfcount[MCAST_INCLUDE]) |
| 1678 | pmc->sfmode = MCAST_INCLUDE; |
| 1679 | #ifdef CONFIG_IP_MULTICAST |
| 1680 | /* else no filters; keep old mode for reports */ |
| 1681 | |
| 1682 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
| 1683 | IGMP_Unsolicited_Report_Count; |
| 1684 | in_dev->mr_ifc_count = pmc->crcount; |
| 1685 | for (psf=pmc->sources; psf; psf = psf->sf_next) |
| 1686 | psf->sf_crcount = 0; |
| 1687 | igmp_ifc_event(in_dev); |
| 1688 | } else if (sf_setstate(pmc)) { |
| 1689 | igmp_ifc_event(in_dev); |
| 1690 | #endif |
| 1691 | } |
| 1692 | spin_unlock_bh(&pmc->lock); |
| 1693 | return err; |
| 1694 | } |
| 1695 | |
| 1696 | static void ip_mc_clear_src(struct ip_mc_list *pmc) |
| 1697 | { |
| 1698 | struct ip_sf_list *psf, *nextpsf; |
| 1699 | |
| 1700 | for (psf=pmc->tomb; psf; psf=nextpsf) { |
| 1701 | nextpsf = psf->sf_next; |
| 1702 | kfree(psf); |
| 1703 | } |
| 1704 | pmc->tomb = NULL; |
| 1705 | for (psf=pmc->sources; psf; psf=nextpsf) { |
| 1706 | nextpsf = psf->sf_next; |
| 1707 | kfree(psf); |
| 1708 | } |
| 1709 | pmc->sources = NULL; |
| 1710 | pmc->sfmode = MCAST_EXCLUDE; |
Denis Lukianov | de9daad | 2005-09-14 20:53:42 -0700 | [diff] [blame] | 1711 | pmc->sfcount[MCAST_INCLUDE] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
| 1713 | } |
| 1714 | |
| 1715 | |
| 1716 | /* |
| 1717 | * Join a multicast group |
| 1718 | */ |
| 1719 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) |
| 1720 | { |
| 1721 | int err; |
| 1722 | u32 addr = imr->imr_multiaddr.s_addr; |
David L Stevens | ca9b907 | 2005-07-08 17:38:07 -0700 | [diff] [blame] | 1723 | struct ip_mc_socklist *iml=NULL, *i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | struct in_device *in_dev; |
| 1725 | struct inet_sock *inet = inet_sk(sk); |
David L Stevens | ca9b907 | 2005-07-08 17:38:07 -0700 | [diff] [blame] | 1726 | int ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | int count = 0; |
| 1728 | |
| 1729 | if (!MULTICAST(addr)) |
| 1730 | return -EINVAL; |
| 1731 | |
| 1732 | rtnl_shlock(); |
| 1733 | |
| 1734 | in_dev = ip_mc_find_dev(imr); |
| 1735 | |
| 1736 | if (!in_dev) { |
| 1737 | iml = NULL; |
| 1738 | err = -ENODEV; |
| 1739 | goto done; |
| 1740 | } |
| 1741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | err = -EADDRINUSE; |
David L Stevens | ca9b907 | 2005-07-08 17:38:07 -0700 | [diff] [blame] | 1743 | ifindex = imr->imr_ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | for (i = inet->mc_list; i; i = i->next) { |
David L Stevens | ca9b907 | 2005-07-08 17:38:07 -0700 | [diff] [blame] | 1745 | if (i->multi.imr_multiaddr.s_addr == addr && |
| 1746 | i->multi.imr_ifindex == ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | count++; |
| 1749 | } |
| 1750 | err = -ENOBUFS; |
David L Stevens | ca9b907 | 2005-07-08 17:38:07 -0700 | [diff] [blame] | 1751 | if (count >= sysctl_igmp_max_memberships) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | goto done; |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1753 | iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); |
David L Stevens | ca9b907 | 2005-07-08 17:38:07 -0700 | [diff] [blame] | 1754 | if (iml == NULL) |
| 1755 | goto done; |
| 1756 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | memcpy(&iml->multi, imr, sizeof(*imr)); |
| 1758 | iml->next = inet->mc_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | iml->sflist = NULL; |
| 1760 | iml->sfmode = MCAST_EXCLUDE; |
| 1761 | inet->mc_list = iml; |
| 1762 | ip_mc_inc_group(in_dev, addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | done: |
| 1765 | rtnl_shunlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | return err; |
| 1767 | } |
| 1768 | |
| 1769 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
| 1770 | struct in_device *in_dev) |
| 1771 | { |
| 1772 | int err; |
| 1773 | |
| 1774 | if (iml->sflist == 0) { |
| 1775 | /* any-source empty exclude case */ |
| 1776 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, |
| 1777 | iml->sfmode, 0, NULL, 0); |
| 1778 | } |
| 1779 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, |
| 1780 | iml->sfmode, iml->sflist->sl_count, |
| 1781 | iml->sflist->sl_addr, 0); |
| 1782 | sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); |
| 1783 | iml->sflist = NULL; |
| 1784 | return err; |
| 1785 | } |
| 1786 | |
| 1787 | /* |
| 1788 | * Ask a socket to leave a group. |
| 1789 | */ |
| 1790 | |
| 1791 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
| 1792 | { |
| 1793 | struct inet_sock *inet = inet_sk(sk); |
| 1794 | struct ip_mc_socklist *iml, **imlp; |
David L Stevens | 84b42ba | 2005-07-08 17:48:38 -0700 | [diff] [blame] | 1795 | struct in_device *in_dev; |
| 1796 | u32 group = imr->imr_multiaddr.s_addr; |
| 1797 | u32 ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | |
| 1799 | rtnl_lock(); |
David L Stevens | 84b42ba | 2005-07-08 17:48:38 -0700 | [diff] [blame] | 1800 | in_dev = ip_mc_find_dev(imr); |
| 1801 | if (!in_dev) { |
| 1802 | rtnl_unlock(); |
| 1803 | return -ENODEV; |
| 1804 | } |
| 1805 | ifindex = imr->imr_ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { |
David L Stevens | 84b42ba | 2005-07-08 17:48:38 -0700 | [diff] [blame] | 1807 | if (iml->multi.imr_multiaddr.s_addr == group && |
| 1808 | iml->multi.imr_ifindex == ifindex) { |
| 1809 | (void) ip_mc_leave_src(sk, iml, in_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | |
| 1811 | *imlp = iml->next; |
| 1812 | |
David L Stevens | 84b42ba | 2005-07-08 17:48:38 -0700 | [diff] [blame] | 1813 | ip_mc_dec_group(in_dev, group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | rtnl_unlock(); |
| 1815 | sock_kfree_s(sk, iml, sizeof(*iml)); |
| 1816 | return 0; |
| 1817 | } |
| 1818 | } |
| 1819 | rtnl_unlock(); |
| 1820 | return -EADDRNOTAVAIL; |
| 1821 | } |
| 1822 | |
| 1823 | int ip_mc_source(int add, int omode, struct sock *sk, struct |
| 1824 | ip_mreq_source *mreqs, int ifindex) |
| 1825 | { |
| 1826 | int err; |
| 1827 | struct ip_mreqn imr; |
| 1828 | u32 addr = mreqs->imr_multiaddr; |
| 1829 | struct ip_mc_socklist *pmc; |
| 1830 | struct in_device *in_dev = NULL; |
| 1831 | struct inet_sock *inet = inet_sk(sk); |
| 1832 | struct ip_sf_socklist *psl; |
David L Stevens | 8cdaaa1 | 2005-07-08 17:39:23 -0700 | [diff] [blame] | 1833 | int leavegroup = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | int i, j, rv; |
| 1835 | |
| 1836 | if (!MULTICAST(addr)) |
| 1837 | return -EINVAL; |
| 1838 | |
| 1839 | rtnl_shlock(); |
| 1840 | |
| 1841 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; |
| 1842 | imr.imr_address.s_addr = mreqs->imr_interface; |
| 1843 | imr.imr_ifindex = ifindex; |
| 1844 | in_dev = ip_mc_find_dev(&imr); |
| 1845 | |
| 1846 | if (!in_dev) { |
| 1847 | err = -ENODEV; |
| 1848 | goto done; |
| 1849 | } |
| 1850 | err = -EADDRNOTAVAIL; |
| 1851 | |
| 1852 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
David L Stevens | ca9b907 | 2005-07-08 17:38:07 -0700 | [diff] [blame] | 1853 | if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr |
| 1854 | && pmc->multi.imr_ifindex == imr.imr_ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | break; |
| 1856 | } |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1857 | if (!pmc) { /* must have a prior join */ |
| 1858 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | goto done; |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1860 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | /* if a source filter was set, must be the same mode as before */ |
| 1862 | if (pmc->sflist) { |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1863 | if (pmc->sfmode != omode) { |
| 1864 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | goto done; |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1866 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | } else if (pmc->sfmode != omode) { |
| 1868 | /* allow mode switches for empty-set filters */ |
| 1869 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); |
| 1870 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
| 1871 | NULL, 0); |
| 1872 | pmc->sfmode = omode; |
| 1873 | } |
| 1874 | |
| 1875 | psl = pmc->sflist; |
| 1876 | if (!add) { |
| 1877 | if (!psl) |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1878 | goto done; /* err = -EADDRNOTAVAIL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | rv = !0; |
| 1880 | for (i=0; i<psl->sl_count; i++) { |
| 1881 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
| 1882 | sizeof(__u32)); |
| 1883 | if (rv == 0) |
| 1884 | break; |
| 1885 | } |
| 1886 | if (rv) /* source not found */ |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1887 | goto done; /* err = -EADDRNOTAVAIL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | |
David L Stevens | 8cdaaa1 | 2005-07-08 17:39:23 -0700 | [diff] [blame] | 1889 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
| 1890 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { |
| 1891 | leavegroup = 1; |
| 1892 | goto done; |
| 1893 | } |
| 1894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | /* update the interface filter */ |
| 1896 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
| 1897 | &mreqs->imr_sourceaddr, 1); |
| 1898 | |
| 1899 | for (j=i+1; j<psl->sl_count; j++) |
| 1900 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
| 1901 | psl->sl_count--; |
| 1902 | err = 0; |
| 1903 | goto done; |
| 1904 | } |
| 1905 | /* else, add a new source to the filter */ |
| 1906 | |
| 1907 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { |
| 1908 | err = -ENOBUFS; |
| 1909 | goto done; |
| 1910 | } |
| 1911 | if (!psl || psl->sl_count == psl->sl_max) { |
| 1912 | struct ip_sf_socklist *newpsl; |
| 1913 | int count = IP_SFBLOCK; |
| 1914 | |
| 1915 | if (psl) |
| 1916 | count += psl->sl_max; |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1917 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1918 | if (!newpsl) { |
| 1919 | err = -ENOBUFS; |
| 1920 | goto done; |
| 1921 | } |
| 1922 | newpsl->sl_max = count; |
| 1923 | newpsl->sl_count = count - IP_SFBLOCK; |
| 1924 | if (psl) { |
| 1925 | for (i=0; i<psl->sl_count; i++) |
| 1926 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
| 1927 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); |
| 1928 | } |
| 1929 | pmc->sflist = psl = newpsl; |
| 1930 | } |
| 1931 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ |
| 1932 | for (i=0; i<psl->sl_count; i++) { |
| 1933 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
| 1934 | sizeof(__u32)); |
| 1935 | if (rv == 0) |
| 1936 | break; |
| 1937 | } |
| 1938 | if (rv == 0) /* address already there is an error */ |
| 1939 | goto done; |
| 1940 | for (j=psl->sl_count-1; j>=i; j--) |
| 1941 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
| 1942 | psl->sl_addr[i] = mreqs->imr_sourceaddr; |
| 1943 | psl->sl_count++; |
| 1944 | err = 0; |
| 1945 | /* update the interface list */ |
| 1946 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
| 1947 | &mreqs->imr_sourceaddr, 1); |
| 1948 | done: |
| 1949 | rtnl_shunlock(); |
David L Stevens | 8cdaaa1 | 2005-07-08 17:39:23 -0700 | [diff] [blame] | 1950 | if (leavegroup) |
| 1951 | return ip_mc_leave_group(sk, &imr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | return err; |
| 1953 | } |
| 1954 | |
| 1955 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) |
| 1956 | { |
David L Stevens | 9951f03 | 2005-07-08 17:47:28 -0700 | [diff] [blame] | 1957 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | struct ip_mreqn imr; |
| 1959 | u32 addr = msf->imsf_multiaddr; |
| 1960 | struct ip_mc_socklist *pmc; |
| 1961 | struct in_device *in_dev; |
| 1962 | struct inet_sock *inet = inet_sk(sk); |
| 1963 | struct ip_sf_socklist *newpsl, *psl; |
David L Stevens | 9951f03 | 2005-07-08 17:47:28 -0700 | [diff] [blame] | 1964 | int leavegroup = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | |
| 1966 | if (!MULTICAST(addr)) |
| 1967 | return -EINVAL; |
| 1968 | if (msf->imsf_fmode != MCAST_INCLUDE && |
| 1969 | msf->imsf_fmode != MCAST_EXCLUDE) |
| 1970 | return -EINVAL; |
| 1971 | |
| 1972 | rtnl_shlock(); |
| 1973 | |
| 1974 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
| 1975 | imr.imr_address.s_addr = msf->imsf_interface; |
| 1976 | imr.imr_ifindex = ifindex; |
| 1977 | in_dev = ip_mc_find_dev(&imr); |
| 1978 | |
| 1979 | if (!in_dev) { |
| 1980 | err = -ENODEV; |
| 1981 | goto done; |
| 1982 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | |
David L Stevens | 9951f03 | 2005-07-08 17:47:28 -0700 | [diff] [blame] | 1984 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
| 1985 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { |
| 1986 | leavegroup = 1; |
| 1987 | goto done; |
| 1988 | } |
| 1989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
| 1991 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
| 1992 | pmc->multi.imr_ifindex == imr.imr_ifindex) |
| 1993 | break; |
| 1994 | } |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1995 | if (!pmc) { /* must have a prior join */ |
| 1996 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | goto done; |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 1998 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | if (msf->imsf_numsrc) { |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 2000 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
| 2001 | GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | if (!newpsl) { |
| 2003 | err = -ENOBUFS; |
| 2004 | goto done; |
| 2005 | } |
| 2006 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; |
| 2007 | memcpy(newpsl->sl_addr, msf->imsf_slist, |
| 2008 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); |
| 2009 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
| 2010 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); |
| 2011 | if (err) { |
| 2012 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); |
| 2013 | goto done; |
| 2014 | } |
Yan Zheng | 8713dbf | 2005-10-28 08:02:08 +0800 | [diff] [blame] | 2015 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | newpsl = NULL; |
Yan Zheng | 8713dbf | 2005-10-28 08:02:08 +0800 | [diff] [blame] | 2017 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
| 2018 | msf->imsf_fmode, 0, NULL, 0); |
| 2019 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | psl = pmc->sflist; |
| 2021 | if (psl) { |
| 2022 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, |
| 2023 | psl->sl_count, psl->sl_addr, 0); |
| 2024 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); |
| 2025 | } else |
| 2026 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, |
| 2027 | 0, NULL, 0); |
| 2028 | pmc->sflist = newpsl; |
| 2029 | pmc->sfmode = msf->imsf_fmode; |
David L Stevens | 917f2f1 | 2005-07-08 17:45:16 -0700 | [diff] [blame] | 2030 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | done: |
| 2032 | rtnl_shunlock(); |
David L Stevens | 9951f03 | 2005-07-08 17:47:28 -0700 | [diff] [blame] | 2033 | if (leavegroup) |
| 2034 | err = ip_mc_leave_group(sk, &imr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | return err; |
| 2036 | } |
| 2037 | |
| 2038 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
| 2039 | struct ip_msfilter __user *optval, int __user *optlen) |
| 2040 | { |
| 2041 | int err, len, count, copycount; |
| 2042 | struct ip_mreqn imr; |
| 2043 | u32 addr = msf->imsf_multiaddr; |
| 2044 | struct ip_mc_socklist *pmc; |
| 2045 | struct in_device *in_dev; |
| 2046 | struct inet_sock *inet = inet_sk(sk); |
| 2047 | struct ip_sf_socklist *psl; |
| 2048 | |
| 2049 | if (!MULTICAST(addr)) |
| 2050 | return -EINVAL; |
| 2051 | |
| 2052 | rtnl_shlock(); |
| 2053 | |
| 2054 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
| 2055 | imr.imr_address.s_addr = msf->imsf_interface; |
| 2056 | imr.imr_ifindex = 0; |
| 2057 | in_dev = ip_mc_find_dev(&imr); |
| 2058 | |
| 2059 | if (!in_dev) { |
| 2060 | err = -ENODEV; |
| 2061 | goto done; |
| 2062 | } |
| 2063 | err = -EADDRNOTAVAIL; |
| 2064 | |
| 2065 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
| 2066 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
| 2067 | pmc->multi.imr_ifindex == imr.imr_ifindex) |
| 2068 | break; |
| 2069 | } |
| 2070 | if (!pmc) /* must have a prior join */ |
| 2071 | goto done; |
| 2072 | msf->imsf_fmode = pmc->sfmode; |
| 2073 | psl = pmc->sflist; |
| 2074 | rtnl_shunlock(); |
| 2075 | if (!psl) { |
| 2076 | len = 0; |
| 2077 | count = 0; |
| 2078 | } else { |
| 2079 | count = psl->sl_count; |
| 2080 | } |
| 2081 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; |
| 2082 | len = copycount * sizeof(psl->sl_addr[0]); |
| 2083 | msf->imsf_numsrc = count; |
| 2084 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || |
| 2085 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { |
| 2086 | return -EFAULT; |
| 2087 | } |
| 2088 | if (len && |
| 2089 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) |
| 2090 | return -EFAULT; |
| 2091 | return 0; |
| 2092 | done: |
| 2093 | rtnl_shunlock(); |
| 2094 | return err; |
| 2095 | } |
| 2096 | |
| 2097 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
| 2098 | struct group_filter __user *optval, int __user *optlen) |
| 2099 | { |
| 2100 | int err, i, count, copycount; |
| 2101 | struct sockaddr_in *psin; |
| 2102 | u32 addr; |
| 2103 | struct ip_mc_socklist *pmc; |
| 2104 | struct inet_sock *inet = inet_sk(sk); |
| 2105 | struct ip_sf_socklist *psl; |
| 2106 | |
| 2107 | psin = (struct sockaddr_in *)&gsf->gf_group; |
| 2108 | if (psin->sin_family != AF_INET) |
| 2109 | return -EINVAL; |
| 2110 | addr = psin->sin_addr.s_addr; |
| 2111 | if (!MULTICAST(addr)) |
| 2112 | return -EINVAL; |
| 2113 | |
| 2114 | rtnl_shlock(); |
| 2115 | |
| 2116 | err = -EADDRNOTAVAIL; |
| 2117 | |
| 2118 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
| 2119 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
| 2120 | pmc->multi.imr_ifindex == gsf->gf_interface) |
| 2121 | break; |
| 2122 | } |
| 2123 | if (!pmc) /* must have a prior join */ |
| 2124 | goto done; |
| 2125 | gsf->gf_fmode = pmc->sfmode; |
| 2126 | psl = pmc->sflist; |
| 2127 | rtnl_shunlock(); |
| 2128 | count = psl ? psl->sl_count : 0; |
| 2129 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; |
| 2130 | gsf->gf_numsrc = count; |
| 2131 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || |
| 2132 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { |
| 2133 | return -EFAULT; |
| 2134 | } |
| 2135 | for (i=0; i<copycount; i++) { |
| 2136 | struct sockaddr_in *psin; |
| 2137 | struct sockaddr_storage ss; |
| 2138 | |
| 2139 | psin = (struct sockaddr_in *)&ss; |
| 2140 | memset(&ss, 0, sizeof(ss)); |
| 2141 | psin->sin_family = AF_INET; |
| 2142 | psin->sin_addr.s_addr = psl->sl_addr[i]; |
| 2143 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) |
| 2144 | return -EFAULT; |
| 2145 | } |
| 2146 | return 0; |
| 2147 | done: |
| 2148 | rtnl_shunlock(); |
| 2149 | return err; |
| 2150 | } |
| 2151 | |
| 2152 | /* |
| 2153 | * check if a multicast source filter allows delivery for a given <src,dst,intf> |
| 2154 | */ |
| 2155 | int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) |
| 2156 | { |
| 2157 | struct inet_sock *inet = inet_sk(sk); |
| 2158 | struct ip_mc_socklist *pmc; |
| 2159 | struct ip_sf_socklist *psl; |
| 2160 | int i; |
| 2161 | |
| 2162 | if (!MULTICAST(loc_addr)) |
| 2163 | return 1; |
| 2164 | |
| 2165 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
| 2166 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
| 2167 | pmc->multi.imr_ifindex == dif) |
| 2168 | break; |
| 2169 | } |
| 2170 | if (!pmc) |
| 2171 | return 1; |
| 2172 | psl = pmc->sflist; |
| 2173 | if (!psl) |
| 2174 | return pmc->sfmode == MCAST_EXCLUDE; |
| 2175 | |
| 2176 | for (i=0; i<psl->sl_count; i++) { |
| 2177 | if (psl->sl_addr[i] == rmt_addr) |
| 2178 | break; |
| 2179 | } |
| 2180 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
| 2181 | return 0; |
| 2182 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
| 2183 | return 0; |
| 2184 | return 1; |
| 2185 | } |
| 2186 | |
| 2187 | /* |
| 2188 | * A socket is closing. |
| 2189 | */ |
| 2190 | |
| 2191 | void ip_mc_drop_socket(struct sock *sk) |
| 2192 | { |
| 2193 | struct inet_sock *inet = inet_sk(sk); |
| 2194 | struct ip_mc_socklist *iml; |
| 2195 | |
| 2196 | if (inet->mc_list == NULL) |
| 2197 | return; |
| 2198 | |
| 2199 | rtnl_lock(); |
| 2200 | while ((iml = inet->mc_list) != NULL) { |
| 2201 | struct in_device *in_dev; |
| 2202 | inet->mc_list = iml->next; |
| 2203 | |
| 2204 | if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { |
| 2205 | (void) ip_mc_leave_src(sk, iml, in_dev); |
| 2206 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
| 2207 | in_dev_put(in_dev); |
| 2208 | } |
| 2209 | sock_kfree_s(sk, iml, sizeof(*iml)); |
| 2210 | |
| 2211 | } |
| 2212 | rtnl_unlock(); |
| 2213 | } |
| 2214 | |
| 2215 | int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) |
| 2216 | { |
| 2217 | struct ip_mc_list *im; |
| 2218 | struct ip_sf_list *psf; |
| 2219 | int rv = 0; |
| 2220 | |
| 2221 | read_lock(&in_dev->mc_list_lock); |
| 2222 | for (im=in_dev->mc_list; im; im=im->next) { |
| 2223 | if (im->multiaddr == mc_addr) |
| 2224 | break; |
| 2225 | } |
| 2226 | if (im && proto == IPPROTO_IGMP) { |
| 2227 | rv = 1; |
| 2228 | } else if (im) { |
| 2229 | if (src_addr) { |
| 2230 | for (psf=im->sources; psf; psf=psf->sf_next) { |
| 2231 | if (psf->sf_inaddr == src_addr) |
| 2232 | break; |
| 2233 | } |
| 2234 | if (psf) |
| 2235 | rv = psf->sf_count[MCAST_INCLUDE] || |
| 2236 | psf->sf_count[MCAST_EXCLUDE] != |
| 2237 | im->sfcount[MCAST_EXCLUDE]; |
| 2238 | else |
| 2239 | rv = im->sfcount[MCAST_EXCLUDE] != 0; |
| 2240 | } else |
| 2241 | rv = 1; /* unspecified source; tentatively allow */ |
| 2242 | } |
| 2243 | read_unlock(&in_dev->mc_list_lock); |
| 2244 | return rv; |
| 2245 | } |
| 2246 | |
| 2247 | #if defined(CONFIG_PROC_FS) |
| 2248 | struct igmp_mc_iter_state { |
| 2249 | struct net_device *dev; |
| 2250 | struct in_device *in_dev; |
| 2251 | }; |
| 2252 | |
| 2253 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) |
| 2254 | |
| 2255 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) |
| 2256 | { |
| 2257 | struct ip_mc_list *im = NULL; |
| 2258 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| 2259 | |
| 2260 | for (state->dev = dev_base, state->in_dev = NULL; |
| 2261 | state->dev; |
| 2262 | state->dev = state->dev->next) { |
| 2263 | struct in_device *in_dev; |
| 2264 | in_dev = in_dev_get(state->dev); |
| 2265 | if (!in_dev) |
| 2266 | continue; |
| 2267 | read_lock(&in_dev->mc_list_lock); |
| 2268 | im = in_dev->mc_list; |
| 2269 | if (im) { |
| 2270 | state->in_dev = in_dev; |
| 2271 | break; |
| 2272 | } |
| 2273 | read_unlock(&in_dev->mc_list_lock); |
| 2274 | in_dev_put(in_dev); |
| 2275 | } |
| 2276 | return im; |
| 2277 | } |
| 2278 | |
| 2279 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) |
| 2280 | { |
| 2281 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| 2282 | im = im->next; |
| 2283 | while (!im) { |
| 2284 | if (likely(state->in_dev != NULL)) { |
| 2285 | read_unlock(&state->in_dev->mc_list_lock); |
| 2286 | in_dev_put(state->in_dev); |
| 2287 | } |
| 2288 | state->dev = state->dev->next; |
| 2289 | if (!state->dev) { |
| 2290 | state->in_dev = NULL; |
| 2291 | break; |
| 2292 | } |
| 2293 | state->in_dev = in_dev_get(state->dev); |
| 2294 | if (!state->in_dev) |
| 2295 | continue; |
| 2296 | read_lock(&state->in_dev->mc_list_lock); |
| 2297 | im = state->in_dev->mc_list; |
| 2298 | } |
| 2299 | return im; |
| 2300 | } |
| 2301 | |
| 2302 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) |
| 2303 | { |
| 2304 | struct ip_mc_list *im = igmp_mc_get_first(seq); |
| 2305 | if (im) |
| 2306 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) |
| 2307 | --pos; |
| 2308 | return pos ? NULL : im; |
| 2309 | } |
| 2310 | |
| 2311 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) |
| 2312 | { |
| 2313 | read_lock(&dev_base_lock); |
| 2314 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2315 | } |
| 2316 | |
| 2317 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2318 | { |
| 2319 | struct ip_mc_list *im; |
| 2320 | if (v == SEQ_START_TOKEN) |
| 2321 | im = igmp_mc_get_first(seq); |
| 2322 | else |
| 2323 | im = igmp_mc_get_next(seq, v); |
| 2324 | ++*pos; |
| 2325 | return im; |
| 2326 | } |
| 2327 | |
| 2328 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) |
| 2329 | { |
| 2330 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| 2331 | if (likely(state->in_dev != NULL)) { |
| 2332 | read_unlock(&state->in_dev->mc_list_lock); |
| 2333 | in_dev_put(state->in_dev); |
| 2334 | state->in_dev = NULL; |
| 2335 | } |
| 2336 | state->dev = NULL; |
| 2337 | read_unlock(&dev_base_lock); |
| 2338 | } |
| 2339 | |
| 2340 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) |
| 2341 | { |
| 2342 | if (v == SEQ_START_TOKEN) |
| 2343 | seq_puts(seq, |
| 2344 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
| 2345 | else { |
| 2346 | struct ip_mc_list *im = (struct ip_mc_list *)v; |
| 2347 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
| 2348 | char *querier; |
| 2349 | #ifdef CONFIG_IP_MULTICAST |
| 2350 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : |
| 2351 | IGMP_V2_SEEN(state->in_dev) ? "V2" : |
| 2352 | "V3"; |
| 2353 | #else |
| 2354 | querier = "NONE"; |
| 2355 | #endif |
| 2356 | |
| 2357 | if (state->in_dev->mc_list == im) { |
| 2358 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
| 2359 | state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); |
| 2360 | } |
| 2361 | |
| 2362 | seq_printf(seq, |
| 2363 | "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", |
| 2364 | im->multiaddr, im->users, |
| 2365 | im->tm_running, im->tm_running ? |
| 2366 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, |
| 2367 | im->reporter); |
| 2368 | } |
| 2369 | return 0; |
| 2370 | } |
| 2371 | |
| 2372 | static struct seq_operations igmp_mc_seq_ops = { |
| 2373 | .start = igmp_mc_seq_start, |
| 2374 | .next = igmp_mc_seq_next, |
| 2375 | .stop = igmp_mc_seq_stop, |
| 2376 | .show = igmp_mc_seq_show, |
| 2377 | }; |
| 2378 | |
| 2379 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) |
| 2380 | { |
| 2381 | struct seq_file *seq; |
| 2382 | int rc = -ENOMEM; |
| 2383 | struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 2384 | |
| 2385 | if (!s) |
| 2386 | goto out; |
| 2387 | rc = seq_open(file, &igmp_mc_seq_ops); |
| 2388 | if (rc) |
| 2389 | goto out_kfree; |
| 2390 | |
| 2391 | seq = file->private_data; |
| 2392 | seq->private = s; |
| 2393 | memset(s, 0, sizeof(*s)); |
| 2394 | out: |
| 2395 | return rc; |
| 2396 | out_kfree: |
| 2397 | kfree(s); |
| 2398 | goto out; |
| 2399 | } |
| 2400 | |
| 2401 | static struct file_operations igmp_mc_seq_fops = { |
| 2402 | .owner = THIS_MODULE, |
| 2403 | .open = igmp_mc_seq_open, |
| 2404 | .read = seq_read, |
| 2405 | .llseek = seq_lseek, |
| 2406 | .release = seq_release_private, |
| 2407 | }; |
| 2408 | |
| 2409 | struct igmp_mcf_iter_state { |
| 2410 | struct net_device *dev; |
| 2411 | struct in_device *idev; |
| 2412 | struct ip_mc_list *im; |
| 2413 | }; |
| 2414 | |
| 2415 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) |
| 2416 | |
| 2417 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) |
| 2418 | { |
| 2419 | struct ip_sf_list *psf = NULL; |
| 2420 | struct ip_mc_list *im = NULL; |
| 2421 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| 2422 | |
| 2423 | for (state->dev = dev_base, state->idev = NULL, state->im = NULL; |
| 2424 | state->dev; |
| 2425 | state->dev = state->dev->next) { |
| 2426 | struct in_device *idev; |
| 2427 | idev = in_dev_get(state->dev); |
| 2428 | if (unlikely(idev == NULL)) |
| 2429 | continue; |
| 2430 | read_lock(&idev->mc_list_lock); |
| 2431 | im = idev->mc_list; |
| 2432 | if (likely(im != NULL)) { |
| 2433 | spin_lock_bh(&im->lock); |
| 2434 | psf = im->sources; |
| 2435 | if (likely(psf != NULL)) { |
| 2436 | state->im = im; |
| 2437 | state->idev = idev; |
| 2438 | break; |
| 2439 | } |
| 2440 | spin_unlock_bh(&im->lock); |
| 2441 | } |
| 2442 | read_unlock(&idev->mc_list_lock); |
| 2443 | in_dev_put(idev); |
| 2444 | } |
| 2445 | return psf; |
| 2446 | } |
| 2447 | |
| 2448 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) |
| 2449 | { |
| 2450 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| 2451 | |
| 2452 | psf = psf->sf_next; |
| 2453 | while (!psf) { |
| 2454 | spin_unlock_bh(&state->im->lock); |
| 2455 | state->im = state->im->next; |
| 2456 | while (!state->im) { |
| 2457 | if (likely(state->idev != NULL)) { |
| 2458 | read_unlock(&state->idev->mc_list_lock); |
| 2459 | in_dev_put(state->idev); |
| 2460 | } |
| 2461 | state->dev = state->dev->next; |
| 2462 | if (!state->dev) { |
| 2463 | state->idev = NULL; |
| 2464 | goto out; |
| 2465 | } |
| 2466 | state->idev = in_dev_get(state->dev); |
| 2467 | if (!state->idev) |
| 2468 | continue; |
| 2469 | read_lock(&state->idev->mc_list_lock); |
| 2470 | state->im = state->idev->mc_list; |
| 2471 | } |
| 2472 | if (!state->im) |
| 2473 | break; |
| 2474 | spin_lock_bh(&state->im->lock); |
| 2475 | psf = state->im->sources; |
| 2476 | } |
| 2477 | out: |
| 2478 | return psf; |
| 2479 | } |
| 2480 | |
| 2481 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) |
| 2482 | { |
| 2483 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); |
| 2484 | if (psf) |
| 2485 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) |
| 2486 | --pos; |
| 2487 | return pos ? NULL : psf; |
| 2488 | } |
| 2489 | |
| 2490 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) |
| 2491 | { |
| 2492 | read_lock(&dev_base_lock); |
| 2493 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2494 | } |
| 2495 | |
| 2496 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2497 | { |
| 2498 | struct ip_sf_list *psf; |
| 2499 | if (v == SEQ_START_TOKEN) |
| 2500 | psf = igmp_mcf_get_first(seq); |
| 2501 | else |
| 2502 | psf = igmp_mcf_get_next(seq, v); |
| 2503 | ++*pos; |
| 2504 | return psf; |
| 2505 | } |
| 2506 | |
| 2507 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) |
| 2508 | { |
| 2509 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| 2510 | if (likely(state->im != NULL)) { |
| 2511 | spin_unlock_bh(&state->im->lock); |
| 2512 | state->im = NULL; |
| 2513 | } |
| 2514 | if (likely(state->idev != NULL)) { |
| 2515 | read_unlock(&state->idev->mc_list_lock); |
| 2516 | in_dev_put(state->idev); |
| 2517 | state->idev = NULL; |
| 2518 | } |
| 2519 | state->dev = NULL; |
| 2520 | read_unlock(&dev_base_lock); |
| 2521 | } |
| 2522 | |
| 2523 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) |
| 2524 | { |
| 2525 | struct ip_sf_list *psf = (struct ip_sf_list *)v; |
| 2526 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
| 2527 | |
| 2528 | if (v == SEQ_START_TOKEN) { |
| 2529 | seq_printf(seq, |
| 2530 | "%3s %6s " |
| 2531 | "%10s %10s %6s %6s\n", "Idx", |
| 2532 | "Device", "MCA", |
| 2533 | "SRC", "INC", "EXC"); |
| 2534 | } else { |
| 2535 | seq_printf(seq, |
| 2536 | "%3d %6.6s 0x%08x " |
| 2537 | "0x%08x %6lu %6lu\n", |
| 2538 | state->dev->ifindex, state->dev->name, |
| 2539 | ntohl(state->im->multiaddr), |
| 2540 | ntohl(psf->sf_inaddr), |
| 2541 | psf->sf_count[MCAST_INCLUDE], |
| 2542 | psf->sf_count[MCAST_EXCLUDE]); |
| 2543 | } |
| 2544 | return 0; |
| 2545 | } |
| 2546 | |
| 2547 | static struct seq_operations igmp_mcf_seq_ops = { |
| 2548 | .start = igmp_mcf_seq_start, |
| 2549 | .next = igmp_mcf_seq_next, |
| 2550 | .stop = igmp_mcf_seq_stop, |
| 2551 | .show = igmp_mcf_seq_show, |
| 2552 | }; |
| 2553 | |
| 2554 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) |
| 2555 | { |
| 2556 | struct seq_file *seq; |
| 2557 | int rc = -ENOMEM; |
| 2558 | struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 2559 | |
| 2560 | if (!s) |
| 2561 | goto out; |
| 2562 | rc = seq_open(file, &igmp_mcf_seq_ops); |
| 2563 | if (rc) |
| 2564 | goto out_kfree; |
| 2565 | |
| 2566 | seq = file->private_data; |
| 2567 | seq->private = s; |
| 2568 | memset(s, 0, sizeof(*s)); |
| 2569 | out: |
| 2570 | return rc; |
| 2571 | out_kfree: |
| 2572 | kfree(s); |
| 2573 | goto out; |
| 2574 | } |
| 2575 | |
| 2576 | static struct file_operations igmp_mcf_seq_fops = { |
| 2577 | .owner = THIS_MODULE, |
| 2578 | .open = igmp_mcf_seq_open, |
| 2579 | .read = seq_read, |
| 2580 | .llseek = seq_lseek, |
| 2581 | .release = seq_release_private, |
| 2582 | }; |
| 2583 | |
| 2584 | int __init igmp_mc_proc_init(void) |
| 2585 | { |
| 2586 | proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); |
| 2587 | proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); |
| 2588 | return 0; |
| 2589 | } |
| 2590 | #endif |
| 2591 | |
| 2592 | EXPORT_SYMBOL(ip_mc_dec_group); |
| 2593 | EXPORT_SYMBOL(ip_mc_inc_group); |
| 2594 | EXPORT_SYMBOL(ip_mc_join_group); |