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   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>
  94
  95 #include <net/arp.h>
  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;
 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;
 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;
 399         int scount, stotal, first, isquery, truncate;
 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
 409         stotal = scount = 0;
 410
 411         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 412
 413         if (!*psf_list)
 414                 goto empty_source;
 415
 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;
 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;
 461                 scount++; stotal++;
 462                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 463                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 464                         psf->sf_crcount--;
 465                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 466                                 if (psf_prev)
 467                                         psf_prev->sf_next = psf->sf_next;
 468                                 else
 469                                         *psf_list = psf->sf_next;
 470                                 kfree(psf);
 471                                 continue;
 472                         }
 473                 }
 474                 psf_prev = psf;
 475         }
 476
 477 empty_source:
 478         if (!stotal) {
 479                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 480                     type == IGMPV3_BLOCK_OLD_SOURCES)
 481                         return skb;
 482                 if (pmc->crcount || isquery) {
 483                         /* make sure we have room for group header */
 484                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 485                                 igmpv3_sendpack(skb);
 486                                 skb = NULL; /* add_grhead will get a new one */
 487                         }
 488                         skb = add_grhead(skb, pmc, type, &pgr);
 489                 }
 490         }
 491         if (pgr)
 492                 pgr->grec_nsrcs = htons(scount);
 493
 494         if (isquery)
 495                 pmc->gsquery = 0;       /* clear query state on report */
 496         return skb;
 497 }
 498
 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 500 {
 501         struct sk_buff *skb = NULL;
 502         int type;
 503
 504         if (!pmc) {
 505                 read_lock(&in_dev->mc_list_lock);
 506                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 507                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 508                                 continue;
 509                         spin_lock_bh(&pmc->lock);
 510                         if (pmc->sfcount[MCAST_EXCLUDE])
 511                                 type = IGMPV3_MODE_IS_EXCLUDE;
 512                         else
 513                                 type = IGMPV3_MODE_IS_INCLUDE;
 514                         skb = add_grec(skb, pmc, type, 0, 0);
 515                         spin_unlock_bh(&pmc->lock);
 516                 }
 517                 read_unlock(&in_dev->mc_list_lock);
 518         } else {
 519                 spin_lock_bh(&pmc->lock);
 520                 if (pmc->sfcount[MCAST_EXCLUDE])
 521                         type = IGMPV3_MODE_IS_EXCLUDE;
 522                 else
 523                         type = IGMPV3_MODE_IS_INCLUDE;
 524                 skb = add_grec(skb, pmc, type, 0, 0);
 525                 spin_unlock_bh(&pmc->lock);
 526         }
 527         if (!skb)
 528                 return 0;
 529         return igmpv3_sendpack(skb);
 530 }
 531
 532 /*
 533  * remove zero-count source records from a source filter list
 534  */
 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 536 {
 537         struct ip_sf_list *psf_prev, *psf_next, *psf;
 538
 539         psf_prev = NULL;
 540         for (psf=*ppsf; psf; psf = psf_next) {
 541                 psf_next = psf->sf_next;
 542                 if (psf->sf_crcount == 0) {
 543                         if (psf_prev)
 544                                 psf_prev->sf_next = psf->sf_next;
 545                         else
 546                                 *ppsf = psf->sf_next;
 547                         kfree(psf);
 548                 } else
 549                         psf_prev = psf;
 550         }
 551 }
 552
 553 static void igmpv3_send_cr(struct in_device *in_dev)
 554 {
 555         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 556         struct sk_buff *skb = NULL;
 557         int type, dtype;
 558
 559         read_lock(&in_dev->mc_list_lock);
 560         spin_lock_bh(&in_dev->mc_tomb_lock);
 561
 562         /* deleted MCA's */
 563         pmc_prev = NULL;
 564         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 565                 pmc_next = pmc->next;
 566                 if (pmc->sfmode == MCAST_INCLUDE) {
 567                         type = IGMPV3_BLOCK_OLD_SOURCES;
 568                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 569                         skb = add_grec(skb, pmc, type, 1, 0);
 570                         skb = add_grec(skb, pmc, dtype, 1, 1);
 571                 }
 572                 if (pmc->crcount) {
 573                         if (pmc->sfmode == MCAST_EXCLUDE) {
 574                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 575                                 skb = add_grec(skb, pmc, type, 1, 0);
 576                         }
 577                         pmc->crcount--;
 578                         if (pmc->crcount == 0) {
 579                                 igmpv3_clear_zeros(&pmc->tomb);
 580                                 igmpv3_clear_zeros(&pmc->sources);
 581                         }
 582                 }
 583                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 584                         if (pmc_prev)
 585                                 pmc_prev->next = pmc_next;
 586                         else
 587                                 in_dev->mc_tomb = pmc_next;
 588                         in_dev_put(pmc->interface);
 589                         kfree(pmc);
 590                 } else
 591                         pmc_prev = pmc;
 592         }
 593         spin_unlock_bh(&in_dev->mc_tomb_lock);
 594
 595         /* change recs */
 596         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 597                 spin_lock_bh(&pmc->lock);
 598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 599                         type = IGMPV3_BLOCK_OLD_SOURCES;
 600                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 601                 } else {
 602                         type = IGMPV3_ALLOW_NEW_SOURCES;
 603                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 604                 }
 605                 skb = add_grec(skb, pmc, type, 0, 0);
 606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 607
 608                 /* filter mode changes */
 609                 if (pmc->crcount) {
 610                         if (pmc->sfmode == MCAST_EXCLUDE)
 611                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 612                         else
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                         skb = add_grec(skb, pmc, type, 0, 0);
 615                         pmc->crcount--;
 616                 }
 617                 spin_unlock_bh(&pmc->lock);
 618         }
 619         read_unlock(&in_dev->mc_list_lock);
 620
 621         if (!skb)
 622                 return;
 623         (void) igmpv3_sendpack(skb);
 624 }
 625
 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 627         int type)
 628 {
 629         struct sk_buff *skb;
 630         struct iphdr *iph;
 631         struct igmphdr *ih;
 632         struct rtable *rt;
 633         struct net_device *dev = in_dev->dev;
 634         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
 751 /* mark EXCLUDE-mode sources */
 752 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
 753 {
 754         struct ip_sf_list *psf;
 755         int i, scount;
 756
 757         scount = 0;
 758         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 759                 if (scount == nsrcs)
 760                         break;
 761                 for (i=0; i<nsrcs; i++) {
 762                         /* skip inactive filters */
 763                         if (pmc->sfcount[MCAST_INCLUDE] ||
 764                             pmc->sfcount[MCAST_EXCLUDE] !=
 765                             psf->sf_count[MCAST_EXCLUDE])
 766                                 continue;
 767                         if (srcs[i] == psf->sf_inaddr) {
 768                                 scount++;
 769                                 break;
 770                         }
 771                 }
 772         }
 773         pmc->gsquery = 0;
 774         if (scount == nsrcs)    /* all sources excluded */
 775                 return 0;
 776         return 1;
 777 }
 778
 779 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __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;
 792                 for (i=0; i<nsrcs; i++)
 793                         if (srcs[i] == psf->sf_inaddr) {
 794                                 psf->sf_gsresp = 1;
 795                                 scount++;
 796                                 break;
 797                         }
 798         }
 799         if (!scount) {
 800                 pmc->gsquery = 0;
 801                 return 0;
 802         }
 803         pmc->gsquery = 1;
 804         return 1;
 805 }
 806
 807 static void igmp_heard_report(struct in_device *in_dev, 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) {
 899                 int changed;
 900
 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;
 910                 changed = !im->gsquery ||
 911                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 912                 spin_unlock_bh(&im->lock);
 913                 if (changed)
 914                         igmp_mod_timer(im, max_delay);
 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
 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;
 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;
 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);
 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:
 973                 break;
 974         }
 975
 976 drop:
 977         in_dev_put(in_dev);
 978         kfree_skb(skb);
 979         return 0;
 980 }
 981
 982 #endif
 983
 984
 985 /*
 986  *      Add a filter to a device
 987  */
 988
 989 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
 990 {
 991         char buf[MAX_ADDR_LEN];
 992         struct net_device *dev = in_dev->dev;
 993
 994         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 995            We will get multicast token leakage, when IFF_MULTICAST
 996            is changed. This check should be done in dev->set_multicast_list
 997            routine. Something sort of:
 998            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 999            --ANK
1000            */
1001         if (arp_mc_map(addr, buf, dev, 0) == 0)
1002                 dev_mc_add(dev,buf,dev->addr_len,0);
1003 }
1004
1005 /*
1006  *      Remove a filter from a device
1007  */
1008
1009 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
1010 {
1011         char buf[MAX_ADDR_LEN];
1012         struct net_device *dev = in_dev->dev;
1013
1014         if (arp_mc_map(addr, buf, dev, 0) == 0)
1015                 dev_mc_delete(dev,buf,dev->addr_len,0);
1016 }
1017
1018 #ifdef CONFIG_IP_MULTICAST
1019 /*
1020  * deleted ip_mc_list manipulation
1021  */
1022 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1023 {
1024         struct ip_mc_list *pmc;
1025
1026         /* this is an "ip_mc_list" for convenience; only the fields below
1027          * are actually used. In particular, the refcnt and users are not
1028          * used for management of the delete list. Using the same structure
1029          * for deleted items allows change reports to use common code with
1030          * non-deleted or query-response MCA's.
1031          */
1032         pmc = kmalloc(sizeof(*pmc), GFP_KERNEL);
1033         if (!pmc)
1034                 return;
1035         memset(pmc, 0, sizeof(*pmc));
1036         spin_lock_bh(&im->lock);
1037         pmc->interface = im->interface;
1038         in_dev_hold(in_dev);
1039         pmc->multiaddr = im->multiaddr;
1040         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1041                 IGMP_Unsolicited_Report_Count;
1042         pmc->sfmode = im->sfmode;
1043         if (pmc->sfmode == MCAST_INCLUDE) {
1044                 struct ip_sf_list *psf;
1045
1046                 pmc->tomb = im->tomb;
1047                 pmc->sources = im->sources;
1048                 im->tomb = im->sources = NULL;
1049                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1050                         psf->sf_crcount = pmc->crcount;
1051         }
1052         spin_unlock_bh(&im->lock);
1053
1054         spin_lock_bh(&in_dev->mc_tomb_lock);
1055         pmc->next = in_dev->mc_tomb;
1056         in_dev->mc_tomb = pmc;
1057         spin_unlock_bh(&in_dev->mc_tomb_lock);
1058 }
1059
1060 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
1061 {
1062         struct ip_mc_list *pmc, *pmc_prev;
1063         struct ip_sf_list *psf, *psf_next;
1064
1065         spin_lock_bh(&in_dev->mc_tomb_lock);
1066         pmc_prev = NULL;
1067         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1068                 if (pmc->multiaddr == multiaddr)
1069                         break;
1070                 pmc_prev = pmc;
1071         }
1072         if (pmc) {
1073                 if (pmc_prev)
1074                         pmc_prev->next = pmc->next;
1075                 else
1076                         in_dev->mc_tomb = pmc->next;
1077         }
1078         spin_unlock_bh(&in_dev->mc_tomb_lock);
1079         if (pmc) {
1080                 for (psf=pmc->tomb; psf; psf=psf_next) {
1081                         psf_next = psf->sf_next;
1082                         kfree(psf);
1083                 }
1084                 in_dev_put(pmc->interface);
1085                 kfree(pmc);
1086         }
1087 }
1088
1089 static void igmpv3_clear_delrec(struct in_device *in_dev)
1090 {
1091         struct ip_mc_list *pmc, *nextpmc;
1092
1093         spin_lock_bh(&in_dev->mc_tomb_lock);
1094         pmc = in_dev->mc_tomb;
1095         in_dev->mc_tomb = NULL;
1096         spin_unlock_bh(&in_dev->mc_tomb_lock);
1097
1098         for (; pmc; pmc = nextpmc) {
1099                 nextpmc = pmc->next;
1100                 ip_mc_clear_src(pmc);
1101                 in_dev_put(pmc->interface);
1102                 kfree(pmc);
1103         }
1104         /* clear dead sources, too */
1105         read_lock(&in_dev->mc_list_lock);
1106         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1107                 struct ip_sf_list *psf, *psf_next;
1108
1109                 spin_lock_bh(&pmc->lock);
1110                 psf = pmc->tomb;
1111                 pmc->tomb = NULL;
1112                 spin_unlock_bh(&pmc->lock);
1113                 for (; psf; psf=psf_next) {
1114                         psf_next = psf->sf_next;
1115                         kfree(psf);
1116                 }
1117         }
1118         read_unlock(&in_dev->mc_list_lock);
1119 }
1120 #endif
1121
1122 static void igmp_group_dropped(struct ip_mc_list *im)
1123 {
1124         struct in_device *in_dev = im->interface;
1125 #ifdef CONFIG_IP_MULTICAST
1126         int reporter;
1127 #endif
1128
1129         if (im->loaded) {
1130                 im->loaded = 0;
1131                 ip_mc_filter_del(in_dev, im->multiaddr);
1132         }
1133
1134 #ifdef CONFIG_IP_MULTICAST
1135         if (im->multiaddr == IGMP_ALL_HOSTS)
1136                 return;
1137
1138         reporter = im->reporter;
1139         igmp_stop_timer(im);
1140
1141         if (!in_dev->dead) {
1142                 if (IGMP_V1_SEEN(in_dev))
1143                         goto done;
1144                 if (IGMP_V2_SEEN(in_dev)) {
1145                         if (reporter)
1146                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1147                         goto done;
1148                 }
1149                 /* IGMPv3 */
1150                 igmpv3_add_delrec(in_dev, im);
1151
1152                 igmp_ifc_event(in_dev);
1153         }
1154 done:
1155 #endif
1156         ip_mc_clear_src(im);
1157 }
1158
1159 static void igmp_group_added(struct ip_mc_list *im)
1160 {
1161         struct in_device *in_dev = im->interface;
1162
1163         if (im->loaded == 0) {
1164                 im->loaded = 1;
1165                 ip_mc_filter_add(in_dev, im->multiaddr);
1166         }
1167
1168 #ifdef CONFIG_IP_MULTICAST
1169         if (im->multiaddr == IGMP_ALL_HOSTS)
1170                 return;
1171
1172         if (in_dev->dead)
1173                 return;
1174         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1175                 spin_lock_bh(&im->lock);
1176                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1177                 spin_unlock_bh(&im->lock);
1178                 return;
1179         }
1180         /* else, v3 */
1181
1182         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1183                 IGMP_Unsolicited_Report_Count;
1184         igmp_ifc_event(in_dev);
1185 #endif
1186 }
1187
1188
1189 /*
1190  *      Multicast list managers
1191  */
1192
1193
1194 /*
1195  *      A socket has joined a multicast group on device dev.
1196  */
1197
1198 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1199 {
1200         struct ip_mc_list *im;
1201
1202         ASSERT_RTNL();
1203
1204         for (im=in_dev->mc_list; im; im=im->next) {
1205                 if (im->multiaddr == addr) {
1206                         im->users++;
1207                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1208                         goto out;
1209                 }
1210         }
1211
1212         im = kmalloc(sizeof(*im), GFP_KERNEL);
1213         if (!im)
1214                 goto out;
1215
1216         im->users=1;
1217         im->interface=in_dev;
1218         in_dev_hold(in_dev);
1219         im->multiaddr=addr;
1220         /* initial mode is (EX, empty) */
1221         im->sfmode = MCAST_EXCLUDE;
1222         im->sfcount[MCAST_INCLUDE] = 0;
1223         im->sfcount[MCAST_EXCLUDE] = 1;
1224         im->sources = NULL;
1225         im->tomb = NULL;
1226         im->crcount = 0;
1227         atomic_set(&im->refcnt, 1);
1228         spin_lock_init(&im->lock);
1229 #ifdef CONFIG_IP_MULTICAST
1230         im->tm_running=0;
1231         init_timer(&im->timer);
1232         im->timer.data=(unsigned long)im;
1233         im->timer.function=&igmp_timer_expire;
1234         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1235         im->reporter = 0;
1236         im->gsquery = 0;
1237 #endif
1238         im->loaded = 0;
1239         write_lock_bh(&in_dev->mc_list_lock);
1240         im->next=in_dev->mc_list;
1241         in_dev->mc_list=im;
1242         write_unlock_bh(&in_dev->mc_list_lock);
1243 #ifdef CONFIG_IP_MULTICAST
1244         igmpv3_del_delrec(in_dev, im->multiaddr);
1245 #endif
1246         igmp_group_added(im);
1247         if (!in_dev->dead)
1248                 ip_rt_multicast_event(in_dev);
1249 out:
1250         return;
1251 }
1252
1253 /*
1254  *      A socket has left a multicast group on device dev
1255  */
1256
1257 void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1258 {
1259         struct ip_mc_list *i, **ip;
1260
1261         ASSERT_RTNL();
1262
1263         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1264                 if (i->multiaddr==addr) {
1265                         if (--i->users == 0) {
1266                                 write_lock_bh(&in_dev->mc_list_lock);
1267                                 *ip = i->next;
1268                                 write_unlock_bh(&in_dev->mc_list_lock);
1269                                 igmp_group_dropped(i);
1270
1271                                 if (!in_dev->dead)
1272                                         ip_rt_multicast_event(in_dev);
1273
1274                                 ip_ma_put(i);
1275                                 return;
1276                         }
1277                         break;
1278                 }
1279         }
1280 }
1281
1282 /* Device going down */
1283
1284 void ip_mc_down(struct in_device *in_dev)
1285 {
1286         struct ip_mc_list *i;
1287
1288         ASSERT_RTNL();
1289
1290         for (i=in_dev->mc_list; i; i=i->next)
1291                 igmp_group_dropped(i);
1292
1293 #ifdef CONFIG_IP_MULTICAST
1294         in_dev->mr_ifc_count = 0;
1295         if (del_timer(&in_dev->mr_ifc_timer))
1296                 __in_dev_put(in_dev);
1297         in_dev->mr_gq_running = 0;
1298         if (del_timer(&in_dev->mr_gq_timer))
1299                 __in_dev_put(in_dev);
1300         igmpv3_clear_delrec(in_dev);
1301 #endif
1302
1303         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1304 }
1305
1306 void ip_mc_init_dev(struct in_device *in_dev)
1307 {
1308         ASSERT_RTNL();
1309
1310         in_dev->mc_tomb = NULL;
1311 #ifdef CONFIG_IP_MULTICAST
1312         in_dev->mr_gq_running = 0;
1313         init_timer(&in_dev->mr_gq_timer);
1314         in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1315         in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1316         in_dev->mr_ifc_count = 0;
1317         init_timer(&in_dev->mr_ifc_timer);
1318         in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1319         in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1320         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1321 #endif
1322
1323         rwlock_init(&in_dev->mc_list_lock);
1324         spin_lock_init(&in_dev->mc_tomb_lock);
1325 }
1326
1327 /* Device going up */
1328
1329 void ip_mc_up(struct in_device *in_dev)
1330 {
1331         struct ip_mc_list *i;
1332
1333         ASSERT_RTNL();
1334
1335         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1336
1337         for (i=in_dev->mc_list; i; i=i->next)
1338                 igmp_group_added(i);
1339 }
1340
1341 /*
1342  *      Device is about to be destroyed: clean up.
1343  */
1344
1345 void ip_mc_destroy_dev(struct in_device *in_dev)
1346 {
1347         struct ip_mc_list *i;
1348
1349         ASSERT_RTNL();
1350
1351         /* Deactivate timers */
1352         ip_mc_down(in_dev);
1353
1354         write_lock_bh(&in_dev->mc_list_lock);
1355         while ((i = in_dev->mc_list) != NULL) {
1356                 in_dev->mc_list = i->next;
1357                 write_unlock_bh(&in_dev->mc_list_lock);
1358
1359                 igmp_group_dropped(i);
1360                 ip_ma_put(i);
1361
1362                 write_lock_bh(&in_dev->mc_list_lock);
1363         }
1364         write_unlock_bh(&in_dev->mc_list_lock);
1365 }
1366
1367 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1368 {
1369         struct flowi fl = { .nl_u = { .ip4_u =
1370                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1371         struct rtable *rt;
1372         struct net_device *dev = NULL;
1373         struct in_device *idev = NULL;
1374
1375         if (imr->imr_ifindex) {
1376                 idev = inetdev_by_index(imr->imr_ifindex);
1377                 if (idev)
1378                         __in_dev_put(idev);
1379                 return idev;
1380         }
1381         if (imr->imr_address.s_addr) {
1382                 dev = ip_dev_find(imr->imr_address.s_addr);
1383                 if (!dev)
1384                         return NULL;
1385                 dev_put(dev);
1386         }
1387
1388         if (!dev && !ip_route_output_key(&rt, &fl)) {
1389                 dev = rt->u.dst.dev;
1390                 ip_rt_put(rt);
1391         }
1392         if (dev) {
1393                 imr->imr_ifindex = dev->ifindex;
1394                 idev = __in_dev_get_rtnl(dev);
1395         }
1396         return idev;
1397 }
1398
1399 /*
1400  *      Join a socket to a group
1401  */
1402 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1403 int sysctl_igmp_max_msf = IP_MAX_MSF;
1404
1405
1406 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1407         __u32 *psfsrc)
1408 {
1409         struct ip_sf_list *psf, *psf_prev;
1410         int rv = 0;
1411
1412         psf_prev = NULL;
1413         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1414                 if (psf->sf_inaddr == *psfsrc)
1415                         break;
1416                 psf_prev = psf;
1417         }
1418         if (!psf || psf->sf_count[sfmode] == 0) {
1419                 /* source filter not found, or count wrong =>  bug */
1420                 return -ESRCH;
1421         }
1422         psf->sf_count[sfmode]--;
1423         if (psf->sf_count[sfmode] == 0) {
1424                 ip_rt_multicast_event(pmc->interface);
1425         }
1426         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1427 #ifdef CONFIG_IP_MULTICAST
1428                 struct in_device *in_dev = pmc->interface;
1429 #endif
1430
1431                 /* no more filters for this source */
1432                 if (psf_prev)
1433                         psf_prev->sf_next = psf->sf_next;
1434                 else
1435                         pmc->sources = psf->sf_next;
1436 #ifdef CONFIG_IP_MULTICAST
1437                 if (psf->sf_oldin &&
1438                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1439                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1440                                 IGMP_Unsolicited_Report_Count;
1441                         psf->sf_next = pmc->tomb;
1442                         pmc->tomb = psf;
1443                         rv = 1;
1444                 } else
1445 #endif
1446                         kfree(psf);
1447         }
1448         return rv;
1449 }
1450
1451 #ifndef CONFIG_IP_MULTICAST
1452 #define igmp_ifc_event(x)       do { } while (0)
1453 #endif
1454
1455 static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1456                          int sfcount, __u32 *psfsrc, int delta)
1457 {
1458         struct ip_mc_list *pmc;
1459         int     changerec = 0;
1460         int     i, err;
1461
1462         if (!in_dev)
1463                 return -ENODEV;
1464         read_lock(&in_dev->mc_list_lock);
1465         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1466                 if (*pmca == pmc->multiaddr)
1467                         break;
1468         }
1469         if (!pmc) {
1470                 /* MCA not found?? bug */
1471                 read_unlock(&in_dev->mc_list_lock);
1472                 return -ESRCH;
1473         }
1474         spin_lock_bh(&pmc->lock);
1475         read_unlock(&in_dev->mc_list_lock);
1476 #ifdef CONFIG_IP_MULTICAST
1477         sf_markstate(pmc);
1478 #endif
1479         if (!delta) {
1480                 err = -EINVAL;
1481                 if (!pmc->sfcount[sfmode])
1482                         goto out_unlock;
1483                 pmc->sfcount[sfmode]--;
1484         }
1485         err = 0;
1486         for (i=0; i<sfcount; i++) {
1487                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1488
1489                 changerec |= rv > 0;
1490                 if (!err && rv < 0)
1491                         err = rv;
1492         }
1493         if (pmc->sfmode == MCAST_EXCLUDE &&
1494             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1495             pmc->sfcount[MCAST_INCLUDE]) {
1496 #ifdef CONFIG_IP_MULTICAST
1497                 struct ip_sf_list *psf;
1498 #endif
1499
1500                 /* filter mode change */
1501                 pmc->sfmode = MCAST_INCLUDE;
1502 #ifdef CONFIG_IP_MULTICAST
1503                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1504                         IGMP_Unsolicited_Report_Count;
1505                 in_dev->mr_ifc_count = pmc->crcount;
1506                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1507                         psf->sf_crcount = 0;
1508                 igmp_ifc_event(pmc->interface);
1509         } else if (sf_setstate(pmc) || changerec) {
1510                 igmp_ifc_event(pmc->interface);
1511 #endif
1512         }
1513 out_unlock:
1514         spin_unlock_bh(&pmc->lock);
1515         return err;
1516 }
1517
1518 /*
1519  * Add multicast single-source filter to the interface list
1520  */
1521 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1522         __u32 *psfsrc, int delta)
1523 {
1524         struct ip_sf_list *psf, *psf_prev;
1525
1526         psf_prev = NULL;
1527         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1528                 if (psf->sf_inaddr == *psfsrc)
1529                         break;
1530                 psf_prev = psf;
1531         }
1532         if (!psf) {
1533                 psf = kmalloc(sizeof(*psf), GFP_ATOMIC);
1534                 if (!psf)
1535                         return -ENOBUFS;
1536                 memset(psf, 0, sizeof(*psf));
1537                 psf->sf_inaddr = *psfsrc;
1538                 if (psf_prev) {
1539                         psf_prev->sf_next = psf;
1540                 } else
1541                         pmc->sources = psf;
1542         }
1543         psf->sf_count[sfmode]++;
1544         if (psf->sf_count[sfmode] == 1) {
1545                 ip_rt_multicast_event(pmc->interface);
1546         }
1547         return 0;
1548 }
1549
1550 #ifdef CONFIG_IP_MULTICAST
1551 static void sf_markstate(struct ip_mc_list *pmc)
1552 {
1553         struct ip_sf_list *psf;
1554         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1555
1556         for (psf=pmc->sources; psf; psf=psf->sf_next)
1557                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1558                         psf->sf_oldin = mca_xcount ==
1559                                 psf->sf_count[MCAST_EXCLUDE] &&
1560                                 !psf->sf_count[MCAST_INCLUDE];
1561                 } else
1562                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1563 }
1564
1565 static int sf_setstate(struct ip_mc_list *pmc)
1566 {
1567         struct ip_sf_list *psf, *dpsf;
1568         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1569         int qrv = pmc->interface->mr_qrv;
1570         int new_in, rv;
1571
1572         rv = 0;
1573         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1574                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1575                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1576                                 !psf->sf_count[MCAST_INCLUDE];
1577                 } else
1578                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1579                 if (new_in) {
1580                         if (!psf->sf_oldin) {
1581                                 struct ip_sf_list *prev = NULL;
1582
1583                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1584                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1585                                                 break;
1586                                         prev = dpsf;
1587                                 }
1588                                 if (dpsf) {
1589                                         if (prev)
1590                                                 prev->sf_next = dpsf->sf_next;
1591                                         else
1592                                                 pmc->tomb = dpsf->sf_next;
1593                                         kfree(dpsf);
1594                                 }
1595                                 psf->sf_crcount = qrv;
1596                                 rv++;
1597                         }
1598                 } else if (psf->sf_oldin) {
1599
1600                         psf->sf_crcount = 0;
1601                         /*
1602                          * add or update "delete" records if an active filter
1603                          * is now inactive
1604                          */
1605                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1606                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1607                                         break;
1608                         if (!dpsf) {
1609                                 dpsf = (struct ip_sf_list *)
1610                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1611                                 if (!dpsf)
1612                                         continue;
1613                                 *dpsf = *psf;
1614                                 /* pmc->lock held by callers */
1615                                 dpsf->sf_next = pmc->tomb;
1616                                 pmc->tomb = dpsf;
1617                         }
1618                         dpsf->sf_crcount = qrv;
1619                         rv++;
1620                 }
1621         }
1622         return rv;
1623 }
1624 #endif
1625
1626 /*
1627  * Add multicast source filter list to the interface list
1628  */
1629 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1630                          int sfcount, __u32 *psfsrc, int delta)
1631 {
1632         struct ip_mc_list *pmc;
1633         int     isexclude;
1634         int     i, err;
1635
1636         if (!in_dev)
1637                 return -ENODEV;
1638         read_lock(&in_dev->mc_list_lock);
1639         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1640                 if (*pmca == pmc->multiaddr)
1641                         break;
1642         }
1643         if (!pmc) {
1644                 /* MCA not found?? bug */
1645                 read_unlock(&in_dev->mc_list_lock);
1646                 return -ESRCH;
1647         }
1648         spin_lock_bh(&pmc->lock);
1649         read_unlock(&in_dev->mc_list_lock);
1650
1651 #ifdef CONFIG_IP_MULTICAST
1652         sf_markstate(pmc);
1653 #endif
1654         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1655         if (!delta)
1656                 pmc->sfcount[sfmode]++;
1657         err = 0;
1658         for (i=0; i<sfcount; i++) {
1659                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1660                 if (err)
1661                         break;
1662         }
1663         if (err) {
1664                 int j;
1665
1666                 pmc->sfcount[sfmode]--;
1667                 for (j=0; j<i; j++)
1668                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1669         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1670 #ifdef CONFIG_IP_MULTICAST
1671                 struct in_device *in_dev = pmc->interface;
1672                 struct ip_sf_list *psf;
1673 #endif
1674
1675                 /* filter mode change */
1676                 if (pmc->sfcount[MCAST_EXCLUDE])
1677                         pmc->sfmode = MCAST_EXCLUDE;
1678                 else if (pmc->sfcount[MCAST_INCLUDE])
1679                         pmc->sfmode = MCAST_INCLUDE;
1680 #ifdef CONFIG_IP_MULTICAST
1681                 /* else no filters; keep old mode for reports */
1682
1683                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1684                         IGMP_Unsolicited_Report_Count;
1685                 in_dev->mr_ifc_count = pmc->crcount;
1686                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1687                         psf->sf_crcount = 0;
1688                 igmp_ifc_event(in_dev);
1689         } else if (sf_setstate(pmc)) {
1690                 igmp_ifc_event(in_dev);
1691 #endif
1692         }
1693         spin_unlock_bh(&pmc->lock);
1694         return err;
1695 }
1696
1697 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1698 {
1699         struct ip_sf_list *psf, *nextpsf;
1700
1701         for (psf=pmc->tomb; psf; psf=nextpsf) {
1702                 nextpsf = psf->sf_next;
1703                 kfree(psf);
1704         }
1705         pmc->tomb = NULL;
1706         for (psf=pmc->sources; psf; psf=nextpsf) {
1707                 nextpsf = psf->sf_next;
1708                 kfree(psf);
1709         }
1710         pmc->sources = NULL;
1711         pmc->sfmode = MCAST_EXCLUDE;
1712         pmc->sfcount[MCAST_INCLUDE] = 0;
1713         pmc->sfcount[MCAST_EXCLUDE] = 1;
1714 }
1715
1716
1717 /*
1718  * Join a multicast group
1719  */
1720 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1721 {
1722         int err;
1723         u32 addr = imr->imr_multiaddr.s_addr;
1724         struct ip_mc_socklist *iml=NULL, *i;
1725         struct in_device *in_dev;
1726         struct inet_sock *inet = inet_sk(sk);
1727         int ifindex;
1728         int count = 0;
1729
1730         if (!MULTICAST(addr))
1731                 return -EINVAL;
1732
1733         rtnl_lock();
1734
1735         in_dev = ip_mc_find_dev(imr);
1736
1737         if (!in_dev) {
1738                 iml = NULL;
1739                 err = -ENODEV;
1740                 goto done;
1741         }
1742
1743         err = -EADDRINUSE;
1744         ifindex = imr->imr_ifindex;
1745         for (i = inet->mc_list; i; i = i->next) {
1746                 if (i->multi.imr_multiaddr.s_addr == addr &&
1747                     i->multi.imr_ifindex == ifindex)
1748                         goto done;
1749                 count++;
1750         }
1751         err = -ENOBUFS;
1752         if (count >= sysctl_igmp_max_memberships)
1753                 goto done;
1754         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1755         if (iml == NULL)
1756                 goto done;
1757
1758         memcpy(&iml->multi, imr, sizeof(*imr));
1759         iml->next = inet->mc_list;
1760         iml->sflist = NULL;
1761         iml->sfmode = MCAST_EXCLUDE;
1762         inet->mc_list = iml;
1763         ip_mc_inc_group(in_dev, addr);
1764         err = 0;
1765 done:
1766         rtnl_unlock();
1767         return err;
1768 }
1769
1770 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1771                            struct in_device *in_dev)
1772 {
1773         int err;
1774
1775         if (iml->sflist == 0) {
1776                 /* any-source empty exclude case */
1777                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1778                         iml->sfmode, 0, NULL, 0);
1779         }
1780         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1781                         iml->sfmode, iml->sflist->sl_count,
1782                         iml->sflist->sl_addr, 0);
1783         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1784         iml->sflist = NULL;
1785         return err;
1786 }
1787
1788 /*
1789  *      Ask a socket to leave a group.
1790  */
1791
1792 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1793 {
1794         struct inet_sock *inet = inet_sk(sk);
1795         struct ip_mc_socklist *iml, **imlp;
1796         struct in_device *in_dev;
1797         u32 group = imr->imr_multiaddr.s_addr;
1798         u32 ifindex;
1799
1800         rtnl_lock();
1801         in_dev = ip_mc_find_dev(imr);
1802         if (!in_dev) {
1803                 rtnl_unlock();
1804                 return -ENODEV;
1805         }
1806         ifindex = imr->imr_ifindex;
1807         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1808                 if (iml->multi.imr_multiaddr.s_addr == group &&
1809                     iml->multi.imr_ifindex == ifindex) {
1810                         (void) ip_mc_leave_src(sk, iml, in_dev);
1811
1812                         *imlp = iml->next;
1813
1814                         ip_mc_dec_group(in_dev, group);
1815                         rtnl_unlock();
1816                         sock_kfree_s(sk, iml, sizeof(*iml));
1817                         return 0;
1818                 }
1819         }
1820         rtnl_unlock();
1821         return -EADDRNOTAVAIL;
1822 }
1823
1824 int ip_mc_source(int add, int omode, struct sock *sk, struct
1825         ip_mreq_source *mreqs, int ifindex)
1826 {
1827         int err;
1828         struct ip_mreqn imr;
1829         u32 addr = mreqs->imr_multiaddr;
1830         struct ip_mc_socklist *pmc;
1831         struct in_device *in_dev = NULL;
1832         struct inet_sock *inet = inet_sk(sk);
1833         struct ip_sf_socklist *psl;
1834         int leavegroup = 0;
1835         int i, j, rv;
1836
1837         if (!MULTICAST(addr))
1838                 return -EINVAL;
1839
1840         rtnl_lock();
1841
1842         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1843         imr.imr_address.s_addr = mreqs->imr_interface;
1844         imr.imr_ifindex = ifindex;
1845         in_dev = ip_mc_find_dev(&imr);
1846
1847         if (!in_dev) {
1848                 err = -ENODEV;
1849                 goto done;
1850         }
1851         err = -EADDRNOTAVAIL;
1852
1853         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1854                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1855                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1856                         break;
1857         }
1858         if (!pmc) {             /* must have a prior join */
1859                 err = -EINVAL;
1860                 goto done;
1861         }
1862         /* if a source filter was set, must be the same mode as before */
1863         if (pmc->sflist) {
1864                 if (pmc->sfmode != omode) {
1865                         err = -EINVAL;
1866                         goto done;
1867                 }
1868         } else if (pmc->sfmode != omode) {
1869                 /* allow mode switches for empty-set filters */
1870                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1871                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1872                         NULL, 0);
1873                 pmc->sfmode = omode;
1874         }
1875
1876         psl = pmc->sflist;
1877         if (!add) {
1878                 if (!psl)
1879                         goto done;      /* err = -EADDRNOTAVAIL */
1880                 rv = !0;
1881                 for (i=0; i<psl->sl_count; i++) {
1882                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1883                                 sizeof(__u32));
1884                         if (rv == 0)
1885                                 break;
1886                 }
1887                 if (rv)         /* source not found */
1888                         goto done;      /* err = -EADDRNOTAVAIL */
1889
1890                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1891                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1892                         leavegroup = 1;
1893                         goto done;
1894                 }
1895
1896                 /* update the interface filter */
1897                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1898                         &mreqs->imr_sourceaddr, 1);
1899
1900                 for (j=i+1; j<psl->sl_count; j++)
1901                         psl->sl_addr[j-1] = psl->sl_addr[j];
1902                 psl->sl_count--;
1903                 err = 0;
1904                 goto done;
1905         }
1906         /* else, add a new source to the filter */
1907
1908         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1909                 err = -ENOBUFS;
1910                 goto done;
1911         }
1912         if (!psl || psl->sl_count == psl->sl_max) {
1913                 struct ip_sf_socklist *newpsl;
1914                 int count = IP_SFBLOCK;
1915
1916                 if (psl)
1917                         count += psl->sl_max;
1918                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1919                 if (!newpsl) {
1920                         err = -ENOBUFS;
1921                         goto done;
1922                 }
1923                 newpsl->sl_max = count;
1924                 newpsl->sl_count = count - IP_SFBLOCK;
1925                 if (psl) {
1926                         for (i=0; i<psl->sl_count; i++)
1927                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1928                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1929                 }
1930                 pmc->sflist = psl = newpsl;
1931         }
1932         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1933         for (i=0; i<psl->sl_count; i++) {
1934                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1935                         sizeof(__u32));
1936                 if (rv == 0)
1937                         break;
1938         }
1939         if (rv == 0)            /* address already there is an error */
1940                 goto done;
1941         for (j=psl->sl_count-1; j>=i; j--)
1942                 psl->sl_addr[j+1] = psl->sl_addr[j];
1943         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1944         psl->sl_count++;
1945         err = 0;
1946         /* update the interface list */
1947         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1948                 &mreqs->imr_sourceaddr, 1);
1949 done:
1950         rtnl_unlock();
1951         if (leavegroup)
1952                 return ip_mc_leave_group(sk, &imr);
1953         return err;
1954 }
1955
1956 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1957 {
1958         int err = 0;
1959         struct ip_mreqn imr;
1960         u32 addr = msf->imsf_multiaddr;
1961         struct ip_mc_socklist *pmc;
1962         struct in_device *in_dev;
1963         struct inet_sock *inet = inet_sk(sk);
1964         struct ip_sf_socklist *newpsl, *psl;
1965         int leavegroup = 0;
1966
1967         if (!MULTICAST(addr))
1968                 return -EINVAL;
1969         if (msf->imsf_fmode != MCAST_INCLUDE &&
1970             msf->imsf_fmode != MCAST_EXCLUDE)
1971                 return -EINVAL;
1972
1973         rtnl_lock();
1974
1975         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1976         imr.imr_address.s_addr = msf->imsf_interface;
1977         imr.imr_ifindex = ifindex;
1978         in_dev = ip_mc_find_dev(&imr);
1979
1980         if (!in_dev) {
1981                 err = -ENODEV;
1982                 goto done;
1983         }
1984
1985         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1986         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
1987                 leavegroup = 1;
1988                 goto done;
1989         }
1990
1991         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1992                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1993                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1994                         break;
1995         }
1996         if (!pmc) {             /* must have a prior join */
1997                 err = -EINVAL;
1998                 goto done;
1999         }
2000         if (msf->imsf_numsrc) {
2001                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2002                                                            GFP_KERNEL);
2003                 if (!newpsl) {
2004                         err = -ENOBUFS;
2005                         goto done;
2006                 }
2007                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2008                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2009                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2010                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2011                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2012                 if (err) {
2013                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2014                         goto done;
2015                 }
2016         } else {
2017                 newpsl = NULL;
2018                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2019                                      msf->imsf_fmode, 0, NULL, 0);
2020         }
2021         psl = pmc->sflist;
2022         if (psl) {
2023                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2024                         psl->sl_count, psl->sl_addr, 0);
2025                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2026         } else
2027                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2028                         0, NULL, 0);
2029         pmc->sflist = newpsl;
2030         pmc->sfmode = msf->imsf_fmode;
2031         err = 0;
2032 done:
2033         rtnl_unlock();
2034         if (leavegroup)
2035                 err = ip_mc_leave_group(sk, &imr);
2036         return err;
2037 }
2038
2039 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2040         struct ip_msfilter __user *optval, int __user *optlen)
2041 {
2042         int err, len, count, copycount;
2043         struct ip_mreqn imr;
2044         u32 addr = msf->imsf_multiaddr;
2045         struct ip_mc_socklist *pmc;
2046         struct in_device *in_dev;
2047         struct inet_sock *inet = inet_sk(sk);
2048         struct ip_sf_socklist *psl;
2049
2050         if (!MULTICAST(addr))
2051                 return -EINVAL;
2052
2053         rtnl_lock();
2054
2055         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2056         imr.imr_address.s_addr = msf->imsf_interface;
2057         imr.imr_ifindex = 0;
2058         in_dev = ip_mc_find_dev(&imr);
2059
2060         if (!in_dev) {
2061                 err = -ENODEV;
2062                 goto done;
2063         }
2064         err = -EADDRNOTAVAIL;
2065
2066         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2067                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2068                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2069                         break;
2070         }
2071         if (!pmc)               /* must have a prior join */
2072                 goto done;
2073         msf->imsf_fmode = pmc->sfmode;
2074         psl = pmc->sflist;
2075         rtnl_unlock();
2076         if (!psl) {
2077                 len = 0;
2078                 count = 0;
2079         } else {
2080                 count = psl->sl_count;
2081         }
2082         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2083         len = copycount * sizeof(psl->sl_addr[0]);
2084         msf->imsf_numsrc = count;
2085         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2086             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2087                 return -EFAULT;
2088         }
2089         if (len &&
2090             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2091                 return -EFAULT;
2092         return 0;
2093 done:
2094         rtnl_unlock();
2095         return err;
2096 }
2097
2098 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2099         struct group_filter __user *optval, int __user *optlen)
2100 {
2101         int err, i, count, copycount;
2102         struct sockaddr_in *psin;
2103         u32 addr;
2104         struct ip_mc_socklist *pmc;
2105         struct inet_sock *inet = inet_sk(sk);
2106         struct ip_sf_socklist *psl;
2107
2108         psin = (struct sockaddr_in *)&gsf->gf_group;
2109         if (psin->sin_family != AF_INET)
2110                 return -EINVAL;
2111         addr = psin->sin_addr.s_addr;
2112         if (!MULTICAST(addr))
2113                 return -EINVAL;
2114
2115         rtnl_lock();
2116
2117         err = -EADDRNOTAVAIL;
2118
2119         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2120                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2121                     pmc->multi.imr_ifindex == gsf->gf_interface)
2122                         break;
2123         }
2124         if (!pmc)               /* must have a prior join */
2125                 goto done;
2126         gsf->gf_fmode = pmc->sfmode;
2127         psl = pmc->sflist;
2128         rtnl_unlock();
2129         count = psl ? psl->sl_count : 0;
2130         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2131         gsf->gf_numsrc = count;
2132         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2133             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2134                 return -EFAULT;
2135         }
2136         for (i=0; i<copycount; i++) {
2137                 struct sockaddr_in *psin;
2138                 struct sockaddr_storage ss;
2139
2140                 psin = (struct sockaddr_in *)&ss;
2141                 memset(&ss, 0, sizeof(ss));
2142                 psin->sin_family = AF_INET;
2143                 psin->sin_addr.s_addr = psl->sl_addr[i];
2144                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2145                         return -EFAULT;
2146         }
2147         return 0;
2148 done:
2149         rtnl_unlock();
2150         return err;
2151 }
2152
2153 /*
2154  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2155  */
2156 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2157 {
2158         struct inet_sock *inet = inet_sk(sk);
2159         struct ip_mc_socklist *pmc;
2160         struct ip_sf_socklist *psl;
2161         int i;
2162
2163         if (!MULTICAST(loc_addr))
2164                 return 1;
2165
2166         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2167                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2168                     pmc->multi.imr_ifindex == dif)
2169                         break;
2170         }
2171         if (!pmc)
2172                 return 1;
2173         psl = pmc->sflist;
2174         if (!psl)
2175                 return pmc->sfmode == MCAST_EXCLUDE;
2176
2177         for (i=0; i<psl->sl_count; i++) {
2178                 if (psl->sl_addr[i] == rmt_addr)
2179                         break;
2180         }
2181         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2182                 return 0;
2183         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2184                 return 0;
2185         return 1;
2186 }
2187
2188 /*
2189  *      A socket is closing.
2190  */
2191
2192 void ip_mc_drop_socket(struct sock *sk)
2193 {
2194         struct inet_sock *inet = inet_sk(sk);
2195         struct ip_mc_socklist *iml;
2196
2197         if (inet->mc_list == NULL)
2198                 return;
2199
2200         rtnl_lock();
2201         while ((iml = inet->mc_list) != NULL) {
2202                 struct in_device *in_dev;
2203                 inet->mc_list = iml->next;
2204
2205                 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2206                         (void) ip_mc_leave_src(sk, iml, in_dev);
2207                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2208                         in_dev_put(in_dev);
2209                 }
2210                 sock_kfree_s(sk, iml, sizeof(*iml));
2211
2212         }
2213         rtnl_unlock();
2214 }
2215
2216 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2217 {
2218         struct ip_mc_list *im;
2219         struct ip_sf_list *psf;
2220         int rv = 0;
2221
2222         read_lock(&in_dev->mc_list_lock);
2223         for (im=in_dev->mc_list; im; im=im->next) {
2224                 if (im->multiaddr == mc_addr)
2225                         break;
2226         }
2227         if (im && proto == IPPROTO_IGMP) {
2228                 rv = 1;
2229         } else if (im) {
2230                 if (src_addr) {
2231                         for (psf=im->sources; psf; psf=psf->sf_next) {
2232                                 if (psf->sf_inaddr == src_addr)
2233                                         break;
2234                         }
2235                         if (psf)
2236                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2237                                         psf->sf_count[MCAST_EXCLUDE] !=
2238                                         im->sfcount[MCAST_EXCLUDE];
2239                         else
2240                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2241                 } else
2242                         rv = 1; /* unspecified source; tentatively allow */
2243         }
2244         read_unlock(&in_dev->mc_list_lock);
2245         return rv;
2246 }
2247
2248 #if defined(CONFIG_PROC_FS)
2249 struct igmp_mc_iter_state {
2250         struct net_device *dev;
2251         struct in_device *in_dev;
2252 };
2253
2254 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2255
2256 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2257 {
2258         struct ip_mc_list *im = NULL;
2259         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2260
2261         for (state->dev = dev_base, state->in_dev = NULL;
2262              state->dev;
2263              state->dev = state->dev->next) {
2264                 struct in_device *in_dev;
2265                 in_dev = in_dev_get(state->dev);
2266                 if (!in_dev)
2267                         continue;
2268                 read_lock(&in_dev->mc_list_lock);
2269                 im = in_dev->mc_list;
2270                 if (im) {
2271                         state->in_dev = in_dev;
2272                         break;
2273                 }
2274                 read_unlock(&in_dev->mc_list_lock);
2275                 in_dev_put(in_dev);
2276         }
2277         return im;
2278 }
2279
2280 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2281 {
2282         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2283         im = im->next;
2284         while (!im) {
2285                 if (likely(state->in_dev != NULL)) {
2286                         read_unlock(&state->in_dev->mc_list_lock);
2287                         in_dev_put(state->in_dev);
2288                 }
2289                 state->dev = state->dev->next;
2290                 if (!state->dev) {
2291                         state->in_dev = NULL;
2292                         break;
2293                 }
2294                 state->in_dev = in_dev_get(state->dev);
2295                 if (!state->in_dev)
2296                         continue;
2297                 read_lock(&state->in_dev->mc_list_lock);
2298                 im = state->in_dev->mc_list;
2299         }
2300         return im;
2301 }
2302
2303 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2304 {
2305         struct ip_mc_list *im = igmp_mc_get_first(seq);
2306         if (im)
2307                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2308                         --pos;
2309         return pos ? NULL : im;
2310 }
2311
2312 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2313 {
2314         read_lock(&dev_base_lock);
2315         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2316 }
2317
2318 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2319 {
2320         struct ip_mc_list *im;
2321         if (v == SEQ_START_TOKEN)
2322                 im = igmp_mc_get_first(seq);
2323         else
2324                 im = igmp_mc_get_next(seq, v);
2325         ++*pos;
2326         return im;
2327 }
2328
2329 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2330 {
2331         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2332         if (likely(state->in_dev != NULL)) {
2333                 read_unlock(&state->in_dev->mc_list_lock);
2334                 in_dev_put(state->in_dev);
2335                 state->in_dev = NULL;
2336         }
2337         state->dev = NULL;
2338         read_unlock(&dev_base_lock);
2339 }
2340
2341 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2342 {
2343         if (v == SEQ_START_TOKEN)
2344                 seq_puts(seq,
2345                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2346         else {
2347                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2348                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2349                 char   *querier;
2350 #ifdef CONFIG_IP_MULTICAST
2351                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2352                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2353                           "V3";
2354 #else
2355                 querier = "NONE";
2356 #endif
2357
2358                 if (state->in_dev->mc_list == im) {
2359                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2360                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2361                 }
2362
2363                 seq_printf(seq,
2364                            "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2365                            im->multiaddr, im->users,
2366                            im->tm_running, im->tm_running ?
2367                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2368                            im->reporter);
2369         }
2370         return 0;
2371 }
2372
2373 static struct seq_operations igmp_mc_seq_ops = {
2374         .start  =       igmp_mc_seq_start,
2375         .next   =       igmp_mc_seq_next,
2376         .stop   =       igmp_mc_seq_stop,
2377         .show   =       igmp_mc_seq_show,
2378 };
2379
2380 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2381 {
2382         struct seq_file *seq;
2383         int rc = -ENOMEM;
2384         struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2385
2386         if (!s)
2387                 goto out;
2388         rc = seq_open(file, &igmp_mc_seq_ops);
2389         if (rc)
2390                 goto out_kfree;
2391
2392         seq = file->private_data;
2393         seq->private = s;
2394         memset(s, 0, sizeof(*s));
2395 out:
2396         return rc;
2397 out_kfree:
2398         kfree(s);
2399         goto out;
2400 }
2401
2402 static struct file_operations igmp_mc_seq_fops = {
2403         .owner          =       THIS_MODULE,
2404         .open           =       igmp_mc_seq_open,
2405         .read           =       seq_read,
2406         .llseek         =       seq_lseek,
2407         .release        =       seq_release_private,
2408 };
2409
2410 struct igmp_mcf_iter_state {
2411         struct net_device *dev;
2412         struct in_device *idev;
2413         struct ip_mc_list *im;
2414 };
2415
2416 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2417
2418 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2419 {
2420         struct ip_sf_list *psf = NULL;
2421         struct ip_mc_list *im = NULL;
2422         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2423
2424         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2425              state->dev;
2426              state->dev = state->dev->next) {
2427                 struct in_device *idev;
2428                 idev = in_dev_get(state->dev);
2429                 if (unlikely(idev == NULL))
2430                         continue;
2431                 read_lock(&idev->mc_list_lock);
2432                 im = idev->mc_list;
2433                 if (likely(im != NULL)) {
2434                         spin_lock_bh(&im->lock);
2435                         psf = im->sources;
2436                         if (likely(psf != NULL)) {
2437                                 state->im = im;
2438                                 state->idev = idev;
2439                                 break;
2440                         }
2441                         spin_unlock_bh(&im->lock);
2442                 }
2443                 read_unlock(&idev->mc_list_lock);
2444                 in_dev_put(idev);
2445         }
2446         return psf;
2447 }
2448
2449 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2450 {
2451         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2452
2453         psf = psf->sf_next;
2454         while (!psf) {
2455                 spin_unlock_bh(&state->im->lock);
2456                 state->im = state->im->next;
2457                 while (!state->im) {
2458                         if (likely(state->idev != NULL)) {
2459                                 read_unlock(&state->idev->mc_list_lock);
2460                                 in_dev_put(state->idev);
2461                         }
2462                         state->dev = state->dev->next;
2463                         if (!state->dev) {
2464                                 state->idev = NULL;
2465                                 goto out;
2466                         }
2467                         state->idev = in_dev_get(state->dev);
2468                         if (!state->idev)
2469                                 continue;
2470                         read_lock(&state->idev->mc_list_lock);
2471                         state->im = state->idev->mc_list;
2472                 }
2473                 if (!state->im)
2474                         break;
2475                 spin_lock_bh(&state->im->lock);
2476                 psf = state->im->sources;
2477         }
2478 out:
2479         return psf;
2480 }
2481
2482 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2483 {
2484         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2485         if (psf)
2486                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2487                         --pos;
2488         return pos ? NULL : psf;
2489 }
2490
2491 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2492 {
2493         read_lock(&dev_base_lock);
2494         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2495 }
2496
2497 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2498 {
2499         struct ip_sf_list *psf;
2500         if (v == SEQ_START_TOKEN)
2501                 psf = igmp_mcf_get_first(seq);
2502         else
2503                 psf = igmp_mcf_get_next(seq, v);
2504         ++*pos;
2505         return psf;
2506 }
2507
2508 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2509 {
2510         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2511         if (likely(state->im != NULL)) {
2512                 spin_unlock_bh(&state->im->lock);
2513                 state->im = NULL;
2514         }
2515         if (likely(state->idev != NULL)) {
2516                 read_unlock(&state->idev->mc_list_lock);
2517                 in_dev_put(state->idev);
2518                 state->idev = NULL;
2519         }
2520         state->dev = NULL;
2521         read_unlock(&dev_base_lock);
2522 }
2523
2524 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2525 {
2526         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2527         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2528
2529         if (v == SEQ_START_TOKEN) {
2530                 seq_printf(seq,
2531                            "%3s %6s "
2532                            "%10s %10s %6s %6s\n", "Idx",
2533                            "Device", "MCA",
2534                            "SRC", "INC", "EXC");
2535         } else {
2536                 seq_printf(seq,
2537                            "%3d %6.6s 0x%08x "
2538                            "0x%08x %6lu %6lu\n",
2539                            state->dev->ifindex, state->dev->name,
2540                            ntohl(state->im->multiaddr),
2541                            ntohl(psf->sf_inaddr),
2542                            psf->sf_count[MCAST_INCLUDE],
2543                            psf->sf_count[MCAST_EXCLUDE]);
2544         }
2545         return 0;
2546 }
2547
2548 static struct seq_operations igmp_mcf_seq_ops = {
2549         .start  =       igmp_mcf_seq_start,
2550         .next   =       igmp_mcf_seq_next,
2551         .stop   =       igmp_mcf_seq_stop,
2552         .show   =       igmp_mcf_seq_show,
2553 };
2554
2555 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2556 {
2557         struct seq_file *seq;
2558         int rc = -ENOMEM;
2559         struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2560
2561         if (!s)
2562                 goto out;
2563         rc = seq_open(file, &igmp_mcf_seq_ops);
2564         if (rc)
2565                 goto out_kfree;
2566
2567         seq = file->private_data;
2568         seq->private = s;
2569         memset(s, 0, sizeof(*s));
2570 out:
2571         return rc;
2572 out_kfree:
2573         kfree(s);
2574         goto out;
2575 }
2576
2577 static struct file_operations igmp_mcf_seq_fops = {
2578         .owner          =       THIS_MODULE,
2579         .open           =       igmp_mcf_seq_open,
2580         .read           =       seq_read,
2581         .llseek         =       seq_lseek,
2582         .release        =       seq_release_private,
2583 };
2584
2585 int __init igmp_mc_proc_init(void)
2586 {
2587         proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2588         proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2589         return 0;
2590 }
2591 #endif
2592
2593 EXPORT_SYMBOL(ip_mc_dec_group);
2594 EXPORT_SYMBOL(ip_mc_inc_group);
2595 EXPORT_SYMBOL(ip_mc_join_group);