igmp.c

   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 1.46 2001/07/27 09:27:29 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
  76 #include <linux/config.h>
  77 #include <asm/uaccess.h>
  78 #include <asm/system.h>
  79 #include <linux/types.h>
  80 #include <linux/kernel.h>
  81 #include <linux/sched.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 <net/ip.h>
  94 #include <net/protocol.h>
  95 #include <net/route.h>
  96 #include <net/sock.h>
  97 #include <net/checksum.h>
  98 #include <linux/netfilter_ipv4.h>
  99 #ifdef CONFIG_IP_MROUTE
 100 #include <linux/mroute.h>
 101 #endif
 102
 103
 104 #define IP_MAX_MEMBERSHIPS      20
 105 #define IP_MAX_MSF              10
 106
 107 #ifdef CONFIG_IP_MULTICAST
 108 /* Parameter names and values are taken from igmp-v2-06 draft */
 109
 110 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 111 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 112 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 113 #define IGMP_Query_Response_Interval            (10*HZ)
 114 #define IGMP_Unsolicited_Report_Count           2
 115
 116
 117 #define IGMP_Initial_Report_Delay               (1)
 118
 119 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 120  * IGMP specs require to report membership immediately after
 121  * joining a group, but we delay the first report by a
 122  * small interval. It seems more natural and still does not
 123  * contradict to specs provided this delay is small enough.
 124  */
 125
 126 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
 127                 (in_dev)->cnf.force_igmp_version == 1 || \
 128                 ((in_dev)->mr_v1_seen && \
 129                 time_before(jiffies, (in_dev)->mr_v1_seen)))
 130 #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
 131                 (in_dev)->cnf.force_igmp_version == 2 || \
 132                 ((in_dev)->mr_v2_seen && \
 133                 time_before(jiffies, (in_dev)->mr_v2_seen)))
 134
 135 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 136 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr);
 137 static void igmpv3_clear_delrec(struct in_device *in_dev);
 138 static int sf_setstate(struct ip_mc_list *pmc);
 139 static void sf_markstate(struct ip_mc_list *pmc);
 140 #endif
 141 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 142 int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
 143         int sfcount, __u32 *psfsrc, int delta);
 144
 145 static void ip_ma_put(struct ip_mc_list *im)
 146 {
 147         if (atomic_dec_and_test(&im->refcnt)) {
 148                 in_dev_put(im->interface);
 149                 kfree(im);
 150         }
 151 }
 152
 153 #ifdef CONFIG_IP_MULTICAST
 154
 155 /*
 156  *      Timer management
 157  */
 158
 159 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 160 {
 161         spin_lock_bh(&im->lock);
 162         if (del_timer(&im->timer))
 163                 atomic_dec(&im->refcnt);
 164         im->tm_running=0;
 165         im->reporter = 0;
 166         im->unsolicit_count = 0;
 167         spin_unlock_bh(&im->lock);
 168 }
 169
 170 /* It must be called with locked im->lock */
 171 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 172 {
 173         int tv=net_random() % max_delay;
 174
 175         im->tm_running=1;
 176         if (!mod_timer(&im->timer, jiffies+tv+2))
 177                 atomic_inc(&im->refcnt);
 178 }
 179
 180 static void igmp_gq_start_timer(struct in_device *in_dev)
 181 {
 182         int tv = net_random() % in_dev->mr_maxdelay;
 183
 184         in_dev->mr_gq_running = 1;
 185         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 186                 in_dev_hold(in_dev);
 187 }
 188
 189 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 190 {
 191         int tv = net_random() % delay;
 192
 193         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 194                 in_dev_hold(in_dev);
 195 }
 196
 197 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 198 {
 199         spin_lock_bh(&im->lock);
 200         im->unsolicit_count = 0;
 201         if (del_timer(&im->timer)) {
 202                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 203                         add_timer(&im->timer);
 204                         im->tm_running=1;
 205                         spin_unlock_bh(&im->lock);
 206                         return;
 207                 }
 208                 atomic_dec(&im->refcnt);
 209         }
 210         igmp_start_timer(im, max_delay);
 211         spin_unlock_bh(&im->lock);
 212 }
 213
 214
 215 /*
 216  *      Send an IGMP report.
 217  */
 218
 219 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 220
 221 /* Don't just hand NF_HOOK skb->dst->output, in case netfilter hook
 222    changes route */
 223 static inline int
 224 output_maybe_reroute(struct sk_buff *skb)
 225 {
 226         return skb->dst->output(skb);
 227 }
 228
 229
 230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 231         int gdeleted, int sdeleted)
 232 {
 233         switch (type) {
 234         case IGMPV3_MODE_IS_INCLUDE:
 235         case IGMPV3_MODE_IS_EXCLUDE:
 236                 if (gdeleted || sdeleted)
 237                         return 0;
 238                 return !(pmc->gsquery && !psf->sf_gsresp);
 239         case IGMPV3_CHANGE_TO_INCLUDE:
 240                 if (gdeleted || sdeleted)
 241                         return 0;
 242                 return psf->sf_count[MCAST_INCLUDE] != 0;
 243         case IGMPV3_CHANGE_TO_EXCLUDE:
 244                 if (gdeleted || sdeleted)
 245                         return 0;
 246                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 247                     psf->sf_count[MCAST_INCLUDE])
 248                         return 0;
 249                 return pmc->sfcount[MCAST_EXCLUDE] ==
 250                         psf->sf_count[MCAST_EXCLUDE];
 251         case IGMPV3_ALLOW_NEW_SOURCES:
 252                 if (gdeleted || !psf->sf_crcount)
 253                         return 0;
 254                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 255         case IGMPV3_BLOCK_OLD_SOURCES:
 256                 if (pmc->sfmode == MCAST_INCLUDE)
 257                         return gdeleted || (psf->sf_crcount && sdeleted);
 258                 return psf->sf_crcount && !gdeleted && !sdeleted;
 259         }
 260         return 0;
 261 }
 262
 263 static int
 264 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 265 {
 266         struct ip_sf_list *psf;
 267         int scount = 0;
 268
 269         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 270                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 271                         continue;
 272                 scount++;
 273         }
 274         return scount;
 275 }
 276
 277 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 278 {
 279         struct sk_buff *skb;
 280         struct rtable *rt;
 281         struct iphdr *pip;
 282         struct igmpv3_report *pig;
 283         u32     dst;
 284
 285         dst = IGMPV3_ALL_MCR;
 286         if (ip_route_output(&rt, dst, 0, 0, dev->ifindex))
 287                 return 0;
 288         if (rt->rt_src == 0) {
 289                 ip_rt_put(rt);
 290                 return 0;
 291         }
 292         skb = alloc_skb(size + dev->hard_header_len + 15, GFP_ATOMIC);
 293         if (skb == NULL) {
 294                 ip_rt_put(rt);
 295                 return 0;
 296         }
 297
 298         skb->dst = &rt->u.dst;
 299         skb->dev = dev;
 300
 301         skb_reserve(skb, (dev->hard_header_len+15)&~15);
 302
 303         skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 304
 305         pip->version  = 4;
 306         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 307         pip->tos      = 0xc0;
 308         pip->frag_off = htons(IP_DF);
 309         pip->ttl      = 1;
 310         pip->daddr    = rt->rt_dst;
 311         pip->saddr    = rt->rt_src;
 312         pip->protocol = IPPROTO_IGMP;
 313         pip->tot_len  = 0;      /* filled in later */
 314         ip_select_ident(pip, &rt->u.dst, NULL);
 315         ((u8*)&pip[1])[0] = IPOPT_RA;
 316         ((u8*)&pip[1])[1] = 4;
 317         ((u8*)&pip[1])[2] = 0;
 318         ((u8*)&pip[1])[3] = 0;
 319
 320         pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
 321         skb->h.igmph = (struct igmphdr *)pig;
 322         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 323         pig->resv1 = 0;
 324         pig->csum = 0;
 325         pig->resv2 = 0;
 326         pig->ngrec = 0;
 327         return skb;
 328 }
 329
 330 static int igmpv3_sendpack(struct sk_buff *skb)
 331 {
 332         struct iphdr *pip = skb->nh.iph;
 333         struct igmphdr *pig = skb->h.igmph;
 334         int iplen, igmplen;
 335
 336         iplen = skb->tail - (unsigned char *)skb->nh.iph;
 337         pip->tot_len = htons(iplen);
 338         ip_send_check(pip);
 339
 340         igmplen = skb->tail - (unsigned char *)skb->h.igmph;
 341         pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
 342
 343         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
 344                        output_maybe_reroute);
 345 }
 346
 347 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 348 {
 349         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 350 }
 351
 352 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 353         int type, struct igmpv3_grec **ppgr)
 354 {
 355         struct net_device *dev = pmc->interface->dev;
 356         struct igmpv3_report *pih;
 357         struct igmpv3_grec *pgr;
 358
 359         if (!skb)
 360                 skb = igmpv3_newpack(dev, dev->mtu);
 361         if (!skb)
 362                 return 0;
 363         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 364         pgr->grec_type = type;
 365         pgr->grec_auxwords = 0;
 366         pgr->grec_nsrcs = 0;
 367         pgr->grec_mca = pmc->multiaddr;
 368         pih = (struct igmpv3_report *)skb->h.igmph;
 369         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 370         *ppgr = pgr;
 371         return skb;
 372 }
 373
 374 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 375         skb_tailroom(skb)) : 0)
 376
 377 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 378         int type, int gdeleted, int sdeleted)
 379 {
 380         struct net_device *dev = pmc->interface->dev;
 381         struct igmpv3_report *pih;
 382         struct igmpv3_grec *pgr = 0;
 383         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 384         int scount, first, isquery, truncate;
 385
 386         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 387                 return skb;
 388
 389         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 390                   type == IGMPV3_MODE_IS_EXCLUDE;
 391         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 392                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 393
 394         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 395
 396         if (!*psf_list) {
 397                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 398                     type == IGMPV3_BLOCK_OLD_SOURCES)
 399                         return skb;
 400                 if (pmc->crcount || isquery) {
 401                         /* make sure we have room for group header and at
 402                          * least one source.
 403                          */
 404                         if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+
 405                             sizeof(__u32)) {
 406                                 igmpv3_sendpack(skb);
 407                                 skb = 0; /* add_grhead will get a new one */
 408                         }
 409                         skb = add_grhead(skb, pmc, type, &pgr);
 410                 }
 411                 return skb;
 412         }
 413         pih = skb ? (struct igmpv3_report *)skb->h.igmph : 0;
 414
 415         /* EX and TO_EX get a fresh packet, if needed */
 416         if (truncate) {
 417                 if (pih && pih->ngrec &&
 418                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 419                         if (skb)
 420                                 igmpv3_sendpack(skb);
 421                         skb = igmpv3_newpack(dev, dev->mtu);
 422                 }
 423         }
 424         first = 1;
 425         scount = 0;
 426         psf_prev = 0;
 427         for (psf=*psf_list; psf; psf=psf_next) {
 428                 u32 *psrc;
 429
 430                 psf_next = psf->sf_next;
 431
 432                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 433                         psf_prev = psf;
 434                         continue;
 435                 }
 436
 437                 /* clear marks on query responses */
 438                 if (isquery)
 439                         psf->sf_gsresp = 0;
 440
 441                 if (AVAILABLE(skb) < sizeof(u32) +
 442                     first*sizeof(struct igmpv3_grec)) {
 443                         if (truncate && !first)
 444                                 break;   /* truncate these */
 445                         if (pgr)
 446                                 pgr->grec_nsrcs = htons(scount);
 447                         if (skb)
 448                                 igmpv3_sendpack(skb);
 449                         skb = igmpv3_newpack(dev, dev->mtu);
 450                         first = 1;
 451                         scount = 0;
 452                 }
 453                 if (first) {
 454                         skb = add_grhead(skb, pmc, type, &pgr);
 455                         first = 0;
 456                 }
 457                 psrc = (u32 *)skb_put(skb, sizeof(u32));
 458                 *psrc = psf->sf_inaddr;
 459                 scount++;
 460                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 461                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 462                         psf->sf_crcount--;
 463                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 464                                 if (psf_prev)
 465                                         psf_prev->sf_next = psf->sf_next;
 466                                 else
 467                                         *psf_list = psf->sf_next;
 468                                 kfree(psf);
 469                                 continue;
 470                         }
 471                 }
 472                 psf_prev = psf;
 473         }
 474         if (pgr)
 475                 pgr->grec_nsrcs = htons(scount);
 476
 477         if (isquery)
 478                 pmc->gsquery = 0;       /* clear query state on report */
 479         return skb;
 480 }
 481
 482 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 483 {
 484         struct sk_buff *skb = 0;
 485         int type;
 486
 487         if (!pmc) {
 488                 read_lock(&in_dev->lock);
 489                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 490                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 491                                 continue;
 492                         spin_lock_bh(&pmc->lock);
 493                         if (pmc->sfcount[MCAST_EXCLUDE])
 494                                 type = IGMPV3_MODE_IS_EXCLUDE;
 495                         else
 496                                 type = IGMPV3_MODE_IS_INCLUDE;
 497                         skb = add_grec(skb, pmc, type, 0, 0);
 498                         spin_unlock_bh(&pmc->lock);
 499                 }
 500                 read_unlock(&in_dev->lock);
 501         } else {
 502                 spin_lock_bh(&pmc->lock);
 503                 if (pmc->sfcount[MCAST_EXCLUDE])
 504                         type = IGMPV3_MODE_IS_EXCLUDE;
 505                 else
 506                         type = IGMPV3_MODE_IS_INCLUDE;
 507                 skb = add_grec(skb, pmc, type, 0, 0);
 508                 spin_unlock_bh(&pmc->lock);
 509         }
 510         if (!skb)
 511                 return 0;
 512         return igmpv3_sendpack(skb);
 513 }
 514
 515 /*
 516  * remove zero-count source records from a source filter list
 517  */
 518 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 519 {
 520         struct ip_sf_list *psf_prev, *psf_next, *psf;
 521
 522         psf_prev = 0;
 523         for (psf=*ppsf; psf; psf = psf_next) {
 524                 psf_next = psf->sf_next;
 525                 if (psf->sf_crcount == 0) {
 526                         if (psf_prev)
 527                                 psf_prev->sf_next = psf->sf_next;
 528                         else
 529                                 *ppsf = psf->sf_next;
 530                         kfree(psf);
 531                 } else
 532                         psf_prev = psf;
 533         }
 534 }
 535
 536 static void igmpv3_send_cr(struct in_device *in_dev)
 537 {
 538         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 539         struct sk_buff *skb = 0;
 540         int type, dtype;
 541
 542         read_lock(&in_dev->lock);
 543         write_lock_bh(&in_dev->mc_lock);
 544
 545         /* deleted MCA's */
 546         pmc_prev = 0;
 547         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 548                 pmc_next = pmc->next;
 549                 if (pmc->sfmode == MCAST_INCLUDE) {
 550                         type = IGMPV3_BLOCK_OLD_SOURCES;
 551                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 552                         skb = add_grec(skb, pmc, type, 1, 0);
 553                         skb = add_grec(skb, pmc, dtype, 1, 1);
 554                 }
 555                 if (pmc->crcount) {
 556                         pmc->crcount--;
 557                         if (pmc->sfmode == MCAST_EXCLUDE) {
 558                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 559                                 skb = add_grec(skb, pmc, type, 1, 0);
 560                         }
 561                         if (pmc->crcount == 0) {
 562                                 igmpv3_clear_zeros(&pmc->tomb);
 563                                 igmpv3_clear_zeros(&pmc->sources);
 564                         }
 565                 }
 566                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 567                         if (pmc_prev)
 568                                 pmc_prev->next = pmc_next;
 569                         else
 570                                 in_dev->mc_tomb = pmc_next;
 571                         in_dev_put(pmc->interface);
 572                         kfree(pmc);
 573                 } else
 574                         pmc_prev = pmc;
 575         }
 576         write_unlock_bh(&in_dev->mc_lock);
 577
 578         /* change recs */
 579         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 580                 spin_lock_bh(&pmc->lock);
 581                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 582                         type = IGMPV3_BLOCK_OLD_SOURCES;
 583                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 584                 } else {
 585                         type = IGMPV3_ALLOW_NEW_SOURCES;
 586                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 587                 }
 588                 skb = add_grec(skb, pmc, type, 0, 0);
 589                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 590
 591                 /* filter mode changes */
 592                 if (pmc->crcount) {
 593                         pmc->crcount--;
 594                         if (pmc->sfmode == MCAST_EXCLUDE)
 595                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 596                         else
 597                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 598                         skb = add_grec(skb, pmc, type, 0, 0);
 599                 }
 600                 spin_unlock_bh(&pmc->lock);
 601         }
 602         read_unlock(&in_dev->lock);
 603         if (!skb)
 604                 return;
 605         (void) igmpv3_sendpack(skb);
 606 }
 607
 608 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 609         int type)
 610 {
 611         struct sk_buff *skb;
 612         struct iphdr *iph;
 613         struct igmphdr *ih;
 614         struct rtable *rt;
 615         struct net_device *dev = in_dev->dev;
 616         u32     group = pmc ? pmc->multiaddr : 0;
 617         u32     dst;
 618
 619         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 620                 return igmpv3_send_report(in_dev, pmc);
 621         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 622                 dst = IGMP_ALL_ROUTER;
 623         else
 624                 dst = group;
 625
 626         if (ip_route_output(&rt, dst, 0, 0, dev->ifindex))
 627                 return -1;
 628         if (rt->rt_src == 0) {
 629                 ip_rt_put(rt);
 630                 return -1;
 631         }
 632
 633         skb=alloc_skb(IGMP_SIZE+dev->hard_header_len+15, GFP_ATOMIC);
 634         if (skb == NULL) {
 635                 ip_rt_put(rt);
 636                 return -1;
 637         }
 638
 639         skb->dst = &rt->u.dst;
 640
 641         skb_reserve(skb, (dev->hard_header_len+15)&~15);
 642
 643         skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 644
 645         iph->version  = 4;
 646         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 647         iph->tos      = 0xc0;
 648         iph->frag_off = htons(IP_DF);
 649         iph->ttl      = 1;
 650         iph->daddr    = dst;
 651         iph->saddr    = rt->rt_src;
 652         iph->protocol = IPPROTO_IGMP;
 653         iph->tot_len  = htons(IGMP_SIZE);
 654         ip_select_ident(iph, &rt->u.dst, NULL);
 655         ((u8*)&iph[1])[0] = IPOPT_RA;
 656         ((u8*)&iph[1])[1] = 4;
 657         ((u8*)&iph[1])[2] = 0;
 658         ((u8*)&iph[1])[3] = 0;
 659         ip_send_check(iph);
 660
 661         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 662         ih->type=type;
 663         ih->code=0;
 664         ih->csum=0;
 665         ih->group=group;
 666         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 667
 668         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
 669                        output_maybe_reroute);
 670 }
 671
 672 static void igmp_gq_timer_expire(unsigned long data)
 673 {
 674         struct in_device *in_dev = (struct in_device *)data;
 675
 676         in_dev->mr_gq_running = 0;
 677         igmpv3_send_report(in_dev, 0);
 678         __in_dev_put(in_dev);
 679 }
 680
 681 static void igmp_ifc_timer_expire(unsigned long data)
 682 {
 683         struct in_device *in_dev = (struct in_device *)data;
 684
 685         igmpv3_send_cr(in_dev);
 686         if (in_dev->mr_ifc_count) {
 687                 in_dev->mr_ifc_count--;
 688                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 689         }
 690         __in_dev_put(in_dev);
 691 }
 692
 693 static void igmp_ifc_event(struct in_device *in_dev)
 694 {
 695         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 696                 return;
 697         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 698                 IGMP_Unsolicited_Report_Count;
 699         igmp_ifc_start_timer(in_dev, 1);
 700 }
 701
 702
 703 static void igmp_timer_expire(unsigned long data)
 704 {
 705         struct ip_mc_list *im=(struct ip_mc_list *)data;
 706         struct in_device *in_dev = im->interface;
 707
 708         spin_lock(&im->lock);
 709         im->tm_running=0;
 710
 711         if (im->unsolicit_count) {
 712                 im->unsolicit_count--;
 713                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 714         }
 715         im->reporter = 1;
 716         spin_unlock(&im->lock);
 717
 718         if (IGMP_V1_SEEN(in_dev))
 719                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 720         else if (IGMP_V2_SEEN(in_dev))
 721                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 722         else
 723                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 724
 725         ip_ma_put(im);
 726 }
 727
 728 static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
 729 {
 730         struct ip_sf_list *psf;
 731         int i, scount;
 732
 733         scount = 0;
 734         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 735                 if (scount == nsrcs)
 736                         break;
 737                 for (i=0; i<nsrcs; i++)
 738                         if (srcs[i] == psf->sf_inaddr) {
 739                                 psf->sf_gsresp = 1;
 740                                 scount++;
 741                                 break;
 742                         }
 743         }
 744 }
 745
 746 static void igmp_heard_report(struct in_device *in_dev, u32 group)
 747 {
 748         struct ip_mc_list *im;
 749
 750         /* Timers are only set for non-local groups */
 751
 752         if (group == IGMP_ALL_HOSTS)
 753                 return;
 754
 755         read_lock(&in_dev->lock);
 756         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 757                 if (im->multiaddr == group) {
 758                         igmp_stop_timer(im);
 759                         break;
 760                 }
 761         }
 762         read_unlock(&in_dev->lock);
 763 }
 764
 765 static void igmp_heard_query(struct in_device *in_dev, struct igmphdr *ih,
 766         int len)
 767 {
 768         struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
 769         struct ip_mc_list       *im;
 770         u32                     group = ih->group;
 771         int                     max_delay;
 772         int                     mark = 0;
 773
 774
 775         if (len == 8) {
 776                 if (ih->code == 0) {
 777                         /* Alas, old v1 router presents here. */
 778
 779                         max_delay = IGMP_Query_Response_Interval;
 780                         in_dev->mr_v1_seen = jiffies +
 781                                 IGMP_V1_Router_Present_Timeout;
 782                         group = 0;
 783                 } else {
 784                         /* v2 router present */
 785                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 786                         in_dev->mr_v2_seen = jiffies +
 787                                 IGMP_V2_Router_Present_Timeout;
 788                 }
 789                 /* cancel the interface change timer */
 790                 in_dev->mr_ifc_count = 0;
 791                 if (del_timer(&in_dev->mr_ifc_timer))
 792                         __in_dev_put(in_dev);
 793                 /* clear deleted report items */
 794                 igmpv3_clear_delrec(in_dev);
 795         } else if (len < 12) {
 796                 return; /* ignore bogus packet; freed by caller */
 797         } else { /* v3 */
 798                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 799                 if (!max_delay)
 800                         max_delay = 1;  /* can't mod w/ 0 */
 801                 in_dev->mr_maxdelay = max_delay;
 802                 if (ih3->qrv)
 803                         in_dev->mr_qrv = ih3->qrv;
 804                 if (!group) { /* general query */
 805                         if (ih3->nsrcs)
 806                                 return; /* no sources allowed */
 807                         igmp_gq_start_timer(in_dev);
 808                         return;
 809                 }
 810                 /* mark sources to include, if group & source-specific */
 811                 mark = ih3->nsrcs != 0;
 812         }
 813
 814         /*
 815          * - Start the timers in all of our membership records
 816          *   that the query applies to for the interface on
 817          *   which the query arrived excl. those that belong
 818          *   to a "local" group (224.0.0.X)
 819          * - For timers already running check if they need to
 820          *   be reset.
 821          * - Use the igmp->igmp_code field as the maximum
 822          *   delay possible
 823          */
 824         read_lock(&in_dev->lock);
 825         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 826                 if (group && group != im->multiaddr)
 827                         continue;
 828                 if (im->multiaddr == IGMP_ALL_HOSTS)
 829                         continue;
 830                 spin_lock_bh(&im->lock);
 831                 if (im->tm_running)
 832                         im->gsquery = im->gsquery && mark;
 833                 else
 834                         im->gsquery = mark;
 835                 if (im->gsquery)
 836                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 837                 spin_unlock_bh(&im->lock);
 838                 igmp_mod_timer(im, max_delay);
 839         }
 840         read_unlock(&in_dev->lock);
 841 }
 842
 843 int igmp_rcv(struct sk_buff *skb)
 844 {
 845         /* This basically follows the spec line by line -- see RFC1112 */
 846         struct igmphdr *ih = skb->h.igmph;
 847         struct in_device *in_dev = in_dev_get(skb->dev);
 848         int len = skb->len;
 849
 850         if (in_dev==NULL) {
 851                 kfree_skb(skb);
 852                 return 0;
 853         }
 854
 855         if (skb_is_nonlinear(skb)) {
 856                 if (skb_linearize(skb, GFP_ATOMIC) != 0) {
 857                         kfree_skb(skb);
 858                         return -ENOMEM;
 859                 }
 860                 ih = skb->h.igmph;
 861         }
 862
 863         if (len < sizeof(struct igmphdr) || ip_compute_csum((void *)ih, len)) {
 864                 in_dev_put(in_dev);
 865                 kfree_skb(skb);
 866                 return 0;
 867         }
 868
 869         switch (ih->type) {
 870         case IGMP_HOST_MEMBERSHIP_QUERY:
 871                 igmp_heard_query(in_dev, ih, len);
 872                 break;
 873         case IGMP_HOST_MEMBERSHIP_REPORT:
 874         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 875         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 876                 /* Is it our report looped back? */
 877                 if (((struct rtable*)skb->dst)->key.iif == 0)
 878                         break;
 879                 /* don't rely on MC router hearing unicast reports */
 880                 if (skb->pkt_type == PACKET_MULTICAST ||
 881                     skb->pkt_type == PACKET_BROADCAST)
 882                         igmp_heard_report(in_dev, ih->group);
 883                 igmp_heard_report(in_dev, ih->group);
 884                 break;
 885         case IGMP_PIM:
 886 #ifdef CONFIG_IP_PIMSM_V1
 887                 in_dev_put(in_dev);
 888                 return pim_rcv_v1(skb);
 889 #endif
 890         case IGMP_DVMRP:
 891         case IGMP_TRACE:
 892         case IGMP_HOST_LEAVE_MESSAGE:
 893         case IGMP_MTRACE:
 894         case IGMP_MTRACE_RESP:
 895                 break;
 896         default:
 897                 NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type));
 898         }
 899         in_dev_put(in_dev);
 900         kfree_skb(skb);
 901         return 0;
 902 }
 903
 904 #endif
 905
 906
 907 /*
 908  *      Add a filter to a device
 909  */
 910
 911 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
 912 {
 913         char buf[MAX_ADDR_LEN];
 914         struct net_device *dev = in_dev->dev;
 915
 916         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 917            We will get multicast token leakage, when IFF_MULTICAST
 918            is changed. This check should be done in dev->set_multicast_list
 919            routine. Something sort of:
 920            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 921            --ANK
 922            */
 923         if (arp_mc_map(addr, buf, dev, 0) == 0)
 924                 dev_mc_add(dev,buf,dev->addr_len,0);
 925 }
 926
 927 /*
 928  *      Remove a filter from a device
 929  */
 930
 931 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
 932 {
 933         char buf[MAX_ADDR_LEN];
 934         struct net_device *dev = in_dev->dev;
 935
 936         if (arp_mc_map(addr, buf, dev, 0) == 0)
 937                 dev_mc_delete(dev,buf,dev->addr_len,0);
 938 }
 939
 940 #ifdef CONFIG_IP_MULTICAST
 941 /*
 942  * deleted ip_mc_list manipulation
 943  */
 944 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
 945 {
 946         struct ip_mc_list *pmc;
 947
 948         /* this is an "ip_mc_list" for convenience; only the fields below
 949          * are actually used. In particular, the refcnt and users are not
 950          * used for management of the delete list. Using the same structure
 951          * for deleted items allows change reports to use common code with
 952          * non-deleted or query-response MCA's.
 953          */
 954         pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL);
 955         if (!pmc)
 956                 return;
 957         memset(pmc, 0, sizeof(*pmc));
 958         spin_lock_bh(&im->lock);
 959         pmc->interface = im->interface;
 960         in_dev_hold(in_dev);
 961         pmc->multiaddr = im->multiaddr;
 962         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
 963                 IGMP_Unsolicited_Report_Count;
 964         pmc->sfmode = im->sfmode;
 965         if (pmc->sfmode == MCAST_INCLUDE) {
 966                 struct ip_sf_list *psf;
 967
 968                 pmc->tomb = im->tomb;
 969                 pmc->sources = im->sources;
 970                 im->tomb = im->sources = 0;
 971                 for (psf=pmc->sources; psf; psf=psf->sf_next)
 972                         psf->sf_crcount = pmc->crcount;
 973         }
 974         spin_unlock_bh(&im->lock);
 975
 976         write_lock_bh(&in_dev->mc_lock);
 977         pmc->next = in_dev->mc_tomb;
 978         in_dev->mc_tomb = pmc;
 979         write_unlock_bh(&in_dev->mc_lock);
 980 }
 981
 982 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
 983 {
 984         struct ip_mc_list *pmc, *pmc_prev;
 985         struct ip_sf_list *psf, *psf_next;
 986
 987         write_lock_bh(&in_dev->mc_lock);
 988         pmc_prev = 0;
 989         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
 990                 if (pmc->multiaddr == multiaddr)
 991                         break;
 992                 pmc_prev = pmc;
 993         }
 994         if (pmc) {
 995                 if (pmc_prev)
 996                         pmc_prev->next = pmc->next;
 997                 else
 998                         in_dev->mc_tomb = pmc->next;
 999         }
1000         write_unlock_bh(&in_dev->mc_lock);
1001         if (pmc) {
1002                 for (psf=pmc->tomb; psf; psf=psf_next) {
1003                         psf_next = psf->sf_next;
1004                         kfree(psf);
1005                 }
1006                 in_dev_put(pmc->interface);
1007                 kfree(pmc);
1008         }
1009 }
1010
1011 static void igmpv3_clear_delrec(struct in_device *in_dev)
1012 {
1013         struct ip_mc_list *pmc, *nextpmc;
1014
1015         write_lock_bh(&in_dev->mc_lock);
1016         pmc = in_dev->mc_tomb;
1017         in_dev->mc_tomb = 0;
1018         write_unlock_bh(&in_dev->mc_lock);
1019
1020         for (; pmc; pmc = nextpmc) {
1021                 nextpmc = pmc->next;
1022                 ip_mc_clear_src(pmc);
1023                 in_dev_put(pmc->interface);
1024                 kfree(pmc);
1025         }
1026         /* clear dead sources, too */
1027         read_lock(&in_dev->lock);
1028         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1029                 struct ip_sf_list *psf, *psf_next;
1030
1031                 spin_lock_bh(&pmc->lock);
1032                 psf = pmc->tomb;
1033                 pmc->tomb = 0;
1034                 spin_unlock_bh(&pmc->lock);
1035                 for (; psf; psf=psf_next) {
1036                         psf_next = psf->sf_next;
1037                         kfree(psf);
1038                 }
1039         }
1040         read_unlock(&in_dev->lock);
1041 }
1042 #endif
1043
1044 static void igmp_group_dropped(struct ip_mc_list *im)
1045 {
1046         struct in_device *in_dev = im->interface;
1047 #ifdef CONFIG_IP_MULTICAST
1048         int reporter;
1049 #endif
1050
1051         if (im->loaded) {
1052                 im->loaded = 0;
1053                 ip_mc_filter_del(in_dev, im->multiaddr);
1054         }
1055
1056 #ifdef CONFIG_IP_MULTICAST
1057         if (im->multiaddr == IGMP_ALL_HOSTS)
1058                 return;
1059
1060         reporter = im->reporter;
1061         igmp_stop_timer(im);
1062
1063         if (!in_dev->dead) {
1064                 if (IGMP_V1_SEEN(in_dev))
1065                         goto done;
1066                 if (IGMP_V2_SEEN(in_dev)) {
1067                         if (reporter)
1068                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1069                         goto done;
1070                 }
1071                 /* IGMPv3 */
1072                 igmpv3_add_delrec(in_dev, im);
1073
1074                 igmp_ifc_event(in_dev);
1075         }
1076 done:
1077 #endif
1078         ip_mc_clear_src(im);
1079 }
1080
1081 static void igmp_group_added(struct ip_mc_list *im)
1082 {
1083         struct in_device *in_dev = im->interface;
1084
1085         if (im->loaded == 0) {
1086                 im->loaded = 1;
1087                 ip_mc_filter_add(in_dev, im->multiaddr);
1088         }
1089
1090 #ifdef CONFIG_IP_MULTICAST
1091         if (im->multiaddr == IGMP_ALL_HOSTS)
1092                 return;
1093
1094         if (in_dev->dead)
1095                 return;
1096         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1097                 spin_lock_bh(&im->lock);
1098                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1099                 spin_unlock_bh(&im->lock);
1100                 return;
1101         }
1102         /* else, v3 */
1103
1104         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1105                 IGMP_Unsolicited_Report_Count;
1106         igmp_ifc_event(in_dev);
1107 #endif
1108 }
1109
1110
1111 /*
1112  *      Multicast list managers
1113  */
1114
1115
1116 /*
1117  *      A socket has joined a multicast group on device dev.
1118  */
1119
1120 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1121 {
1122         struct ip_mc_list *im;
1123
1124         ASSERT_RTNL();
1125
1126         for (im=in_dev->mc_list; im; im=im->next) {
1127                 if (im->multiaddr == addr) {
1128                         im->users++;
1129                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, 0, 0);
1130                         goto out;
1131                 }
1132         }
1133
1134         im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL);
1135         if (!im)
1136                 goto out;
1137
1138         im->users=1;
1139         im->interface=in_dev;
1140         in_dev_hold(in_dev);
1141         im->multiaddr=addr;
1142         /* initial mode is (EX, empty) */
1143         im->sfmode = MCAST_EXCLUDE;
1144         im->sfcount[MCAST_INCLUDE] = 0;
1145         im->sfcount[MCAST_EXCLUDE] = 1;
1146         im->sources = 0;
1147         im->tomb = 0;
1148         im->crcount = 0;
1149         atomic_set(&im->refcnt, 1);
1150         spin_lock_init(&im->lock);
1151 #ifdef CONFIG_IP_MULTICAST
1152         im->tm_running=0;
1153         init_timer(&im->timer);
1154         im->timer.data=(unsigned long)im;
1155         im->timer.function=&igmp_timer_expire;
1156         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1157         im->reporter = 0;
1158         im->gsquery = 0;
1159 #endif
1160         im->loaded = 0;
1161         write_lock_bh(&in_dev->lock);
1162         im->next=in_dev->mc_list;
1163         in_dev->mc_list=im;
1164         write_unlock_bh(&in_dev->lock);
1165 #ifdef CONFIG_IP_MULTICAST
1166         igmpv3_del_delrec(in_dev, im->multiaddr);
1167 #endif
1168         igmp_group_added(im);
1169         if (!in_dev->dead)
1170                 ip_rt_multicast_event(in_dev);
1171 out:
1172         return;
1173 }
1174
1175 /*
1176  *      A socket has left a multicast group on device dev
1177  */
1178
1179 void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1180 {
1181         struct ip_mc_list *i, **ip;
1182
1183         ASSERT_RTNL();
1184
1185         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1186                 if (i->multiaddr==addr) {
1187                         if (--i->users == 0) {
1188                                 write_lock_bh(&in_dev->lock);
1189                                 *ip = i->next;
1190                                 write_unlock_bh(&in_dev->lock);
1191                                 igmp_group_dropped(i);
1192
1193                                 if (!in_dev->dead)
1194                                         ip_rt_multicast_event(in_dev);
1195
1196                                 ip_ma_put(i);
1197                                 return;
1198                         }
1199                         break;
1200                 }
1201         }
1202 }
1203
1204 /* Device going down */
1205
1206 void ip_mc_down(struct in_device *in_dev)
1207 {
1208         struct ip_mc_list *i;
1209
1210         ASSERT_RTNL();
1211
1212         for (i=in_dev->mc_list; i; i=i->next)
1213                 igmp_group_dropped(i);
1214
1215 #ifdef CONFIG_IP_MULTICAST
1216         in_dev->mr_ifc_count = 0;
1217         if (del_timer(&in_dev->mr_ifc_timer))
1218                 __in_dev_put(in_dev);
1219         in_dev->mr_gq_running = 0;
1220         if (del_timer(&in_dev->mr_gq_timer))
1221                 __in_dev_put(in_dev);
1222         igmpv3_clear_delrec(in_dev);
1223 #endif
1224
1225         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1226 }
1227
1228 void ip_mc_init_dev(struct in_device *in_dev)
1229 {
1230         ASSERT_RTNL();
1231
1232         in_dev->mc_tomb = 0;
1233 #ifdef CONFIG_IP_MULTICAST
1234         in_dev->mr_gq_running = 0;
1235         init_timer(&in_dev->mr_gq_timer);
1236         in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1237         in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1238         in_dev->mr_ifc_count = 0;
1239         init_timer(&in_dev->mr_ifc_timer);
1240         in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1241         in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1242         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1243 #endif
1244
1245         in_dev->mc_lock = RW_LOCK_UNLOCKED;
1246 }
1247
1248 /* Device going up */
1249
1250 void ip_mc_up(struct in_device *in_dev)
1251 {
1252         struct ip_mc_list *i;
1253
1254         ASSERT_RTNL();
1255
1256         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1257
1258         for (i=in_dev->mc_list; i; i=i->next)
1259                 igmp_group_added(i);
1260 }
1261
1262 /*
1263  *      Device is about to be destroyed: clean up.
1264  */
1265
1266 void ip_mc_destroy_dev(struct in_device *in_dev)
1267 {
1268         struct ip_mc_list *i;
1269
1270         ASSERT_RTNL();
1271
1272         /* Deactivate timers */
1273         ip_mc_down(in_dev);
1274
1275         write_lock_bh(&in_dev->lock);
1276         while ((i = in_dev->mc_list) != NULL) {
1277                 in_dev->mc_list = i->next;
1278                 write_unlock_bh(&in_dev->lock);
1279
1280                 igmp_group_dropped(i);
1281                 ip_ma_put(i);
1282
1283                 write_lock_bh(&in_dev->lock);
1284         }
1285         write_unlock_bh(&in_dev->lock);
1286 }
1287
1288 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1289 {
1290         struct rtable *rt;
1291         struct net_device *dev = NULL;
1292         struct in_device *idev = NULL;
1293
1294         if (imr->imr_ifindex) {
1295                 idev = inetdev_by_index(imr->imr_ifindex);
1296                 if (idev)
1297                         __in_dev_put(idev);
1298                 return idev;
1299         }
1300         if (imr->imr_address.s_addr) {
1301                 dev = ip_dev_find(imr->imr_address.s_addr);
1302                 if (!dev)
1303                         return NULL;
1304                 __dev_put(dev);
1305         }
1306
1307         if (!dev && !ip_route_output(&rt, imr->imr_multiaddr.s_addr, 0, 0, 0)) {
1308                 dev = rt->u.dst.dev;
1309                 ip_rt_put(rt);
1310         }
1311         if (dev) {
1312                 imr->imr_ifindex = dev->ifindex;
1313                 idev = __in_dev_get(dev);
1314         }
1315         return idev;
1316 }
1317
1318 /*
1319  *      Join a socket to a group
1320  */
1321 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1322 int sysctl_igmp_max_msf = IP_MAX_MSF;
1323
1324
1325 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1326         __u32 *psfsrc)
1327 {
1328         struct ip_sf_list *psf, *psf_prev;
1329         int rv = 0;
1330
1331         psf_prev = 0;
1332         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1333                 if (psf->sf_inaddr == *psfsrc)
1334                         break;
1335                 psf_prev = psf;
1336         }
1337         if (!psf || psf->sf_count[sfmode] == 0) {
1338                 /* source filter not found, or count wrong =>  bug */
1339                 return -ESRCH;
1340         }
1341         psf->sf_count[sfmode]--;
1342         if (psf->sf_count[sfmode] == 0) {
1343                 ip_rt_multicast_event(pmc->interface);
1344         }
1345         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1346 #ifdef CONFIG_IP_MULTICAST
1347                 struct in_device *in_dev = pmc->interface;
1348 #endif
1349
1350                 /* no more filters for this source */
1351                 if (psf_prev)
1352                         psf_prev->sf_next = psf->sf_next;
1353                 else
1354                         pmc->sources = psf->sf_next;
1355 #ifdef CONFIG_IP_MULTICAST
1356                 if (psf->sf_oldin &&
1357                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1358                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1359                                 IGMP_Unsolicited_Report_Count;
1360                         psf->sf_next = pmc->tomb;
1361                         pmc->tomb = psf;
1362                         rv = 1;
1363                 } else
1364 #endif
1365                         kfree(psf);
1366         }
1367         return rv;
1368 }
1369
1370 int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1371         int sfcount, __u32 *psfsrc, int delta)
1372 {
1373         struct ip_mc_list *pmc;
1374         int     changerec = 0;
1375         int     i, err;
1376
1377         if (!in_dev)
1378                 return -ENODEV;
1379         read_lock(&in_dev->lock);
1380         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1381                 if (*pmca == pmc->multiaddr)
1382                         break;
1383         }
1384         if (!pmc) {
1385                 /* MCA not found?? bug */
1386                 read_unlock(&in_dev->lock);
1387                 return -ESRCH;
1388         }
1389         spin_lock_bh(&pmc->lock);
1390         read_unlock(&in_dev->lock);
1391 #ifdef CONFIG_IP_MULTICAST
1392         sf_markstate(pmc);
1393 #endif
1394         if (!delta) {
1395                 err = -EINVAL;
1396                 if (!pmc->sfcount[sfmode])
1397                         goto out_unlock;
1398                 pmc->sfcount[sfmode]--;
1399         }
1400         err = 0;
1401         for (i=0; i<sfcount; i++) {
1402                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1403
1404                 changerec |= rv > 0;
1405                 if (!err && rv < 0)
1406                         err = rv;
1407         }
1408         if (pmc->sfmode == MCAST_EXCLUDE &&
1409             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1410             pmc->sfcount[MCAST_INCLUDE]) {
1411 #ifdef CONFIG_IP_MULTICAST
1412                 struct ip_sf_list *psf;
1413 #endif
1414
1415                 /* filter mode change */
1416                 pmc->sfmode = MCAST_INCLUDE;
1417 #ifdef CONFIG_IP_MULTICAST
1418                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1419                         IGMP_Unsolicited_Report_Count;
1420                 in_dev->mr_ifc_count = pmc->crcount;
1421                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1422                         psf->sf_crcount = 0;
1423                 igmp_ifc_event(pmc->interface);
1424         } else if (sf_setstate(pmc) || changerec) {
1425                 igmp_ifc_event(pmc->interface);
1426 #endif
1427         }
1428 out_unlock:
1429         spin_unlock_bh(&pmc->lock);
1430         return err;
1431 }
1432
1433 /*
1434  * Add multicast single-source filter to the interface list
1435  */
1436 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1437         __u32 *psfsrc, int delta)
1438 {
1439         struct ip_sf_list *psf, *psf_prev;
1440
1441         psf_prev = 0;
1442         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1443                 if (psf->sf_inaddr == *psfsrc)
1444                         break;
1445                 psf_prev = psf;
1446         }
1447         if (!psf) {
1448                 psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1449                 if (!psf)
1450                         return -ENOBUFS;
1451                 memset(psf, 0, sizeof(*psf));
1452                 psf->sf_inaddr = *psfsrc;
1453                 if (psf_prev) {
1454                         psf_prev->sf_next = psf;
1455                 } else
1456                         pmc->sources = psf;
1457         }
1458         psf->sf_count[sfmode]++;
1459         if (psf->sf_count[sfmode] == 1) {
1460                 ip_rt_multicast_event(pmc->interface);
1461         }
1462         return 0;
1463 }
1464
1465 #ifdef CONFIG_IP_MULTICAST
1466 static void sf_markstate(struct ip_mc_list *pmc)
1467 {
1468         struct ip_sf_list *psf;
1469         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1470
1471         for (psf=pmc->sources; psf; psf=psf->sf_next)
1472                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1473                         psf->sf_oldin = mca_xcount ==
1474                                 psf->sf_count[MCAST_EXCLUDE] &&
1475                                 !psf->sf_count[MCAST_INCLUDE];
1476                 } else
1477                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1478 }
1479
1480 static int sf_setstate(struct ip_mc_list *pmc)
1481 {
1482         struct ip_sf_list *psf;
1483         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1484         int qrv = pmc->interface->mr_qrv;
1485         int new_in, rv;
1486
1487         rv = 0;
1488         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1489                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1490                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1491                                 !psf->sf_count[MCAST_INCLUDE];
1492                 } else
1493                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1494                 if (new_in != psf->sf_oldin) {
1495                         psf->sf_crcount = qrv;
1496                         rv++;
1497                 }
1498         }
1499         return rv;
1500 }
1501 #endif
1502
1503 /*
1504  * Add multicast source filter list to the interface list
1505  */
1506 int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1507         int sfcount, __u32 *psfsrc, int delta)
1508 {
1509         struct ip_mc_list *pmc;
1510         int     isexclude;
1511         int     i, err;
1512
1513         if (!in_dev)
1514                 return -ENODEV;
1515         read_lock(&in_dev->lock);
1516         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1517                 if (*pmca == pmc->multiaddr)
1518                         break;
1519         }
1520         if (!pmc) {
1521                 /* MCA not found?? bug */
1522                 read_unlock(&in_dev->lock);
1523                 return -ESRCH;
1524         }
1525         spin_lock_bh(&pmc->lock);
1526         read_unlock(&in_dev->lock);
1527
1528 #ifdef CONFIG_IP_MULTICAST
1529         sf_markstate(pmc);
1530 #endif
1531         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1532         if (!delta)
1533                 pmc->sfcount[sfmode]++;
1534         err = 0;
1535         for (i=0; i<sfcount; i++) {
1536                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1537                 if (err)
1538                         break;
1539         }
1540         if (err) {
1541                 int j;
1542
1543                 pmc->sfcount[sfmode]--;
1544                 for (j=0; j<i; j++)
1545                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1546         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1547 #ifdef CONFIG_IP_MULTICAST
1548                 struct in_device *in_dev = pmc->interface;
1549                 struct ip_sf_list *psf;
1550 #endif
1551
1552                 /* filter mode change */
1553                 if (pmc->sfcount[MCAST_EXCLUDE])
1554                         pmc->sfmode = MCAST_EXCLUDE;
1555                 else if (pmc->sfcount[MCAST_INCLUDE])
1556                         pmc->sfmode = MCAST_INCLUDE;
1557 #ifdef CONFIG_IP_MULTICAST
1558                 /* else no filters; keep old mode for reports */
1559
1560                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1561                         IGMP_Unsolicited_Report_Count;
1562                 in_dev->mr_ifc_count = pmc->crcount;
1563                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1564                         psf->sf_crcount = 0;
1565                 igmp_ifc_event(in_dev);
1566         } else if (sf_setstate(pmc)) {
1567                 igmp_ifc_event(in_dev);
1568 #endif
1569         }
1570         spin_unlock_bh(&pmc->lock);
1571         return err;
1572 }
1573
1574 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1575 {
1576         struct ip_sf_list *psf, *nextpsf;
1577
1578         for (psf=pmc->tomb; psf; psf=nextpsf) {
1579                 nextpsf = psf->sf_next;
1580                 kfree(psf);
1581         }
1582         pmc->tomb = 0;
1583         for (psf=pmc->sources; psf; psf=nextpsf) {
1584                 nextpsf = psf->sf_next;
1585                 kfree(psf);
1586         }
1587         pmc->sources = 0;
1588         pmc->sfmode = MCAST_EXCLUDE;
1589         pmc->sfcount[MCAST_INCLUDE] = 0;
1590         pmc->sfcount[MCAST_EXCLUDE] = 1;
1591 }
1592
1593
1594 /*
1595  * Join a multicast group
1596  */
1597 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1598 {
1599         int err;
1600         u32 addr = imr->imr_multiaddr.s_addr;
1601         struct ip_mc_socklist *iml, *i;
1602         struct in_device *in_dev;
1603         struct inet_opt *inet = &sk->protinfo.af_inet;
1604         int count = 0;
1605
1606         if (!MULTICAST(addr))
1607                 return -EINVAL;
1608
1609         rtnl_shlock();
1610
1611         in_dev = ip_mc_find_dev(imr);
1612
1613         if (!in_dev) {
1614                 iml = NULL;
1615                 err = -ENODEV;
1616                 goto done;
1617         }
1618
1619         iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1620
1621         err = -EADDRINUSE;
1622         for (i = inet->mc_list; i; i = i->next) {
1623                 if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) {
1624                         /* New style additions are reference counted */
1625                         if (imr->imr_address.s_addr == 0) {
1626                                 i->count++;
1627                                 err = 0;
1628                         }
1629                         goto done;
1630                 }
1631                 count++;
1632         }
1633         err = -ENOBUFS;
1634         if (iml == NULL || count >= sysctl_igmp_max_memberships)
1635                 goto done;
1636         memcpy(&iml->multi, imr, sizeof(*imr));
1637         iml->next = sk->protinfo.af_inet.mc_list;
1638         iml->count = 1;
1639         iml->sflist = NULL;
1640         iml->sfmode = MCAST_EXCLUDE;
1641         inet->mc_list = iml;
1642         ip_mc_inc_group(in_dev, addr);
1643         iml = NULL;
1644         err = 0;
1645
1646 done:
1647         rtnl_shunlock();
1648         if (iml)
1649                 sock_kfree_s(sk, iml, sizeof(*iml));
1650         return err;
1651 }
1652
1653 int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1654         struct in_device *in_dev)
1655 {
1656         int err;
1657
1658         if (iml->sflist == 0) {
1659                 /* any-source empty exclude case */
1660                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1661                         iml->sfmode, 0, 0, 0);
1662         }
1663         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1664                         iml->sfmode, iml->sflist->sl_count,
1665                         iml->sflist->sl_addr, 0);
1666         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1667         iml->sflist = 0;
1668         return err;
1669 }
1670
1671 /*
1672  *      Ask a socket to leave a group.
1673  */
1674
1675 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1676 {
1677         struct inet_opt *inet = &sk->protinfo.af_inet;
1678         struct ip_mc_socklist *iml, **imlp;
1679
1680         rtnl_lock();
1681         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1682                 if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr &&
1683                     iml->multi.imr_address.s_addr==imr->imr_address.s_addr &&
1684                     (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) {
1685                         struct in_device *in_dev;
1686
1687                         in_dev = inetdev_by_index(iml->multi.imr_ifindex);
1688                         if (in_dev)
1689                                 (void) ip_mc_leave_src(sk, iml, in_dev);
1690                         if (--iml->count) {
1691                                 rtnl_unlock();
1692                                 if (in_dev)
1693                                         in_dev_put(in_dev);
1694                                 return 0;
1695                         }
1696
1697                         *imlp = iml->next;
1698
1699                         if (in_dev) {
1700                                 ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr);
1701                                 in_dev_put(in_dev);
1702                         }
1703                         rtnl_unlock();
1704                         sock_kfree_s(sk, iml, sizeof(*iml));
1705                         return 0;
1706                 }
1707         }
1708         rtnl_unlock();
1709         return -EADDRNOTAVAIL;
1710 }
1711
1712 int ip_mc_source(int add, int omode, struct sock *sk, struct
1713         ip_mreq_source *mreqs, int ifindex)
1714 {
1715         int err;
1716         struct ip_mreqn imr;
1717         u32 addr = mreqs->imr_multiaddr;
1718         struct ip_mc_socklist *pmc;
1719         struct in_device *in_dev = 0;
1720         struct inet_opt *inet = &sk->protinfo.af_inet;
1721         struct ip_sf_socklist *psl;
1722         int i, j, rv;
1723
1724         if (!MULTICAST(addr))
1725                 return -EINVAL;
1726
1727         rtnl_shlock();
1728
1729         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1730         imr.imr_address.s_addr = mreqs->imr_interface;
1731         imr.imr_ifindex = ifindex;
1732         in_dev = ip_mc_find_dev(&imr);
1733
1734         if (!in_dev) {
1735                 err = -ENODEV;
1736                 goto done;
1737         }
1738         err = -EADDRNOTAVAIL;
1739
1740         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1741                 if (memcmp(&pmc->multi, mreqs, 2*sizeof(__u32)) == 0)
1742                         break;
1743         }
1744         if (!pmc)               /* must have a prior join */
1745                 goto done;
1746         /* if a source filter was set, must be the same mode as before */
1747         if (pmc->sflist) {
1748                 if (pmc->sfmode != omode)
1749                         goto done;
1750         } else if (pmc->sfmode != omode) {
1751                 /* allow mode switches for empty-set filters */
1752                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, 0, 0);
1753                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1754                         0, 0);
1755                 pmc->sfmode = omode;
1756         }
1757
1758         psl = pmc->sflist;
1759         if (!add) {
1760                 if (!psl)
1761                         goto done;
1762                 rv = !0;
1763                 for (i=0; i<psl->sl_count; i++) {
1764                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1765                                 sizeof(__u32));
1766                         if (rv == 0)
1767                                 break;
1768                 }
1769                 if (rv)         /* source not found */
1770                         goto done;
1771
1772                 /* update the interface filter */
1773                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1774                         &mreqs->imr_sourceaddr, 1);
1775
1776                 for (j=i+1; j<psl->sl_count; j++)
1777                         psl->sl_addr[j-1] = psl->sl_addr[j];
1778                 psl->sl_count--;
1779                 err = 0;
1780                 goto done;
1781         }
1782         /* else, add a new source to the filter */
1783
1784         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1785                 err = -ENOBUFS;
1786                 goto done;
1787         }
1788         if (!psl || psl->sl_count == psl->sl_max) {
1789                 struct ip_sf_socklist *newpsl;
1790                 int count = IP_SFBLOCK;
1791
1792                 if (psl)
1793                         count += psl->sl_max;
1794                 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1795                         IP_SFLSIZE(count), GFP_KERNEL);
1796                 if (!newpsl) {
1797                         err = -ENOBUFS;
1798                         goto done;
1799                 }
1800                 newpsl->sl_max = count;
1801                 newpsl->sl_count = count - IP_SFBLOCK;
1802                 if (psl) {
1803                         for (i=0; i<psl->sl_count; i++)
1804                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1805                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1806                 }
1807                 pmc->sflist = psl = newpsl;
1808         }
1809         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1810         for (i=0; i<psl->sl_count; i++) {
1811                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1812                         sizeof(__u32));
1813                 if (rv == 0)
1814                         break;
1815         }
1816         if (rv == 0)            /* address already there is an error */
1817                 goto done;
1818         for (j=psl->sl_count-1; j>=i; j--)
1819                 psl->sl_addr[j+1] = psl->sl_addr[j];
1820         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1821         psl->sl_count++;
1822         err = 0;
1823         /* update the interface list */
1824         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1825                 &mreqs->imr_sourceaddr, 1);
1826 done:
1827         rtnl_shunlock();
1828         return err;
1829 }
1830
1831 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1832 {
1833         int err;
1834         struct ip_mreqn imr;
1835         u32 addr = msf->imsf_multiaddr;
1836         struct ip_mc_socklist *pmc;
1837         struct in_device *in_dev;
1838         struct inet_opt *inet = &sk->protinfo.af_inet;
1839         struct ip_sf_socklist *newpsl, *psl;
1840
1841         if (!MULTICAST(addr))
1842                 return -EINVAL;
1843         if (msf->imsf_fmode != MCAST_INCLUDE &&
1844             msf->imsf_fmode != MCAST_EXCLUDE)
1845                 return -EINVAL;
1846
1847         rtnl_shlock();
1848
1849         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1850         imr.imr_address.s_addr = msf->imsf_interface;
1851         imr.imr_ifindex = ifindex;
1852         in_dev = ip_mc_find_dev(&imr);
1853
1854         if (!in_dev) {
1855                 err = -ENODEV;
1856                 goto done;
1857         }
1858         err = -EADDRNOTAVAIL;
1859
1860         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1861                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1862                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1863                         break;
1864         }
1865         if (!pmc)               /* must have a prior join */
1866                 goto done;
1867         if (msf->imsf_numsrc) {
1868                 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1869                                 IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL);
1870                 if (!newpsl) {
1871                         err = -ENOBUFS;
1872                         goto done;
1873                 }
1874                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
1875                 memcpy(newpsl->sl_addr, msf->imsf_slist,
1876                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
1877                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1878                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
1879                 if (err) {
1880                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
1881                         goto done;
1882                 }
1883         } else {
1884                 newpsl = NULL;
1885                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1886                        msf->imsf_fmode, 0, NULL, 0);
1887         }
1888         psl = pmc->sflist;
1889         if (psl) {
1890                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1891                         psl->sl_count, psl->sl_addr, 0);
1892                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1893         } else
1894                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1895                         0, 0, 0);
1896         pmc->sflist = newpsl;
1897         pmc->sfmode = msf->imsf_fmode;
1898 done:
1899         rtnl_shunlock();
1900         return err;
1901 }
1902
1903 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
1904         struct ip_msfilter *optval, int *optlen)
1905 {
1906         int err, len, count, copycount;
1907         struct ip_mreqn imr;
1908         u32 addr = msf->imsf_multiaddr;
1909         struct ip_mc_socklist *pmc;
1910         struct in_device *in_dev;
1911         struct inet_opt *inet = &sk->protinfo.af_inet;
1912         struct ip_sf_socklist *psl;
1913
1914         if (!MULTICAST(addr))
1915                 return -EINVAL;
1916
1917         rtnl_shlock();
1918
1919         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1920         imr.imr_address.s_addr = msf->imsf_interface;
1921         imr.imr_ifindex = 0;
1922         in_dev = ip_mc_find_dev(&imr);
1923
1924         if (!in_dev) {
1925                 err = -ENODEV;
1926                 goto done;
1927         }
1928         err = -EADDRNOTAVAIL;
1929
1930         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1931                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1932                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1933                         break;
1934         }
1935         if (!pmc)               /* must have a prior join */
1936                 goto done;
1937         msf->imsf_fmode = pmc->sfmode;
1938         psl = pmc->sflist;
1939         rtnl_shunlock();
1940         if (!psl) {
1941                 len = 0;
1942                 count = 0;
1943         } else {
1944                 count = psl->sl_count;
1945         }
1946         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
1947         len = copycount * sizeof(psl->sl_addr[0]);
1948         msf->imsf_numsrc = count;
1949         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
1950             copy_to_user((void *)optval, msf, IP_MSFILTER_SIZE(0))) {
1951                 return -EFAULT;
1952         }
1953         if (len &&
1954             copy_to_user((void *)&optval->imsf_slist[0], psl->sl_addr, len))
1955                 return -EFAULT;
1956         return 0;
1957 done:
1958         rtnl_shunlock();
1959         return err;
1960 }
1961
1962 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
1963         struct group_filter *optval, int *optlen)
1964 {
1965         int err, i, count, copycount;
1966         struct sockaddr_in *psin;
1967         u32 addr;
1968         struct ip_mc_socklist *pmc;
1969         struct inet_opt *inet = &sk->protinfo.af_inet;
1970         struct ip_sf_socklist *psl;
1971
1972         psin = (struct sockaddr_in *)&gsf->gf_group;
1973         if (psin->sin_family != AF_INET)
1974                 return -EINVAL;
1975         addr = psin->sin_addr.s_addr;
1976         if (!MULTICAST(addr))
1977                 return -EINVAL;
1978
1979         rtnl_shlock();
1980
1981         err = -EADDRNOTAVAIL;
1982
1983         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1984                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
1985                     pmc->multi.imr_ifindex == gsf->gf_interface)
1986                         break;
1987         }
1988         if (!pmc)               /* must have a prior join */
1989                 goto done;
1990         gsf->gf_fmode = pmc->sfmode;
1991         psl = pmc->sflist;
1992         rtnl_shunlock();
1993         count = psl ? psl->sl_count : 0;
1994         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
1995         gsf->gf_numsrc = count;
1996         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
1997             copy_to_user((void *)optval, gsf, GROUP_FILTER_SIZE(0))) {
1998                 return -EFAULT;
1999         }
2000         for (i=0; i<copycount; i++) {
2001                 struct sockaddr_in *psin;
2002                 struct sockaddr_storage ss;
2003
2004                 psin = (struct sockaddr_in *)&ss;
2005                 memset(&ss, 0, sizeof(ss));
2006                 psin->sin_family = AF_INET;
2007                 psin->sin_addr.s_addr = psl->sl_addr[i];
2008                 if (copy_to_user((void *)&optval->gf_slist[i], &ss, sizeof(ss)))
2009                         return -EFAULT;
2010         }
2011         return 0;
2012 done:
2013         rtnl_shunlock();
2014         return err;
2015 }
2016
2017 /*
2018  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2019  */
2020 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2021 {
2022         struct inet_opt *inet = &sk->protinfo.af_inet;
2023         struct ip_mc_socklist *pmc;
2024         struct ip_sf_socklist *psl;
2025         int i;
2026
2027         if (!MULTICAST(loc_addr))
2028                 return 1;
2029
2030         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2031                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2032                     pmc->multi.imr_ifindex == dif)
2033                         break;
2034         }
2035         if (!pmc)
2036                 return 1;
2037         psl = pmc->sflist;
2038         if (!psl)
2039                 return pmc->sfmode == MCAST_EXCLUDE;
2040
2041         for (i=0; i<psl->sl_count; i++) {
2042                 if (psl->sl_addr[i] == rmt_addr)
2043                         break;
2044         }
2045         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2046                 return 0;
2047         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2048                 return 0;
2049         return 1;
2050 }
2051
2052 /*
2053  *      A socket is closing.
2054  */
2055
2056 void ip_mc_drop_socket(struct sock *sk)
2057 {
2058         struct inet_opt *inet = &sk->protinfo.af_inet;
2059         struct ip_mc_socklist *iml;
2060
2061         if (inet->mc_list == NULL)
2062                 return;
2063
2064         rtnl_lock();
2065         while ((iml = inet->mc_list) != NULL) {
2066                 struct in_device *in_dev;
2067                 inet->mc_list = iml->next;
2068
2069                 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2070                         (void) ip_mc_leave_src(sk, iml, in_dev);
2071                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2072                         in_dev_put(in_dev);
2073                 }
2074                 sock_kfree_s(sk, iml, sizeof(*iml));
2075
2076         }
2077         rtnl_unlock();
2078 }
2079
2080 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr)
2081 {
2082         struct ip_mc_list *im;
2083         struct ip_sf_list *psf;
2084         int rv = 0;
2085
2086         read_lock(&in_dev->lock);
2087         for (im=in_dev->mc_list; im; im=im->next) {
2088                 if (im->multiaddr == mc_addr)
2089                         break;
2090         }
2091         /*
2092          * This should check the protocol and allow all IGMP packets
2093          * here, but it isn't available in the call from ip_route_output()
2094          * in 2.4.x. It shouldn't actually matter, since groups joined
2095          * from within the kernel will have an {exclude, empty} filter.
2096          * Differs from 2.5.x here.     +-DLS 4/23/03
2097          */
2098         if (im) {
2099                 if (src_addr) {
2100                         for (psf=im->sources; psf; psf=psf->sf_next) {
2101                                 if (psf->sf_inaddr == src_addr)
2102                                         break;
2103                         }
2104                         if (psf)
2105                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2106                                         psf->sf_count[MCAST_EXCLUDE] !=
2107                                         im->sfcount[MCAST_EXCLUDE];
2108                         else
2109                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2110                 } else
2111                         rv = 1;
2112         }
2113         read_unlock(&in_dev->lock);
2114         return rv;
2115 }
2116
2117
2118 int ip_mc_procinfo(char *buffer, char **start, off_t offset, int length)
2119 {
2120         off_t pos=0, begin=0;
2121         struct ip_mc_list *im;
2122         int len=0;
2123         struct net_device *dev;
2124
2125         len=sprintf(buffer,"Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2126
2127         read_lock(&dev_base_lock);
2128         for(dev = dev_base; dev; dev = dev->next) {
2129                 struct in_device *in_dev = in_dev_get(dev);
2130                 char   *querier = "NONE";
2131
2132                 if (in_dev == NULL)
2133                         continue;
2134
2135 #ifdef CONFIG_IP_MULTICAST
2136                 querier = IGMP_V1_SEEN(in_dev) ? "V1" : IGMP_V2_SEEN(in_dev) ?
2137                         "V2" : "V3";
2138 #endif
2139
2140                 len+=sprintf(buffer+len,"%d\t%-10s: %5d %7s\n",
2141                              dev->ifindex, dev->name, dev->mc_count, querier);
2142
2143                 read_lock(&in_dev->lock);
2144                 for (im = in_dev->mc_list; im; im = im->next) {
2145                         len+=sprintf(buffer+len,
2146                                      "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2147                                      im->multiaddr, im->users,
2148                                      im->tm_running, im->tm_running ?
2149                                      im->timer.expires-jiffies : 0,
2150                                      im->reporter);
2151
2152                         pos=begin+len;
2153                         if(pos<offset)
2154                         {
2155                                 len=0;
2156                                 begin=pos;
2157                         }
2158                         if(pos>offset+length) {
2159                                 read_unlock(&in_dev->lock);
2160                                 in_dev_put(in_dev);
2161                                 goto done;
2162                         }
2163                 }
2164                 read_unlock(&in_dev->lock);
2165                 in_dev_put(in_dev);
2166         }
2167 done:
2168         read_unlock(&dev_base_lock);
2169
2170         *start=buffer+(offset-begin);
2171         len-=(offset-begin);
2172         if(len>length)
2173                 len=length;
2174         if(len<0)
2175                 len=0;
2176         return len;
2177 }
2178
2179 int ip_mcf_procinfo(char *buffer, char **start, off_t offset, int length)
2180 {
2181         off_t pos=0, begin=0;
2182         int len=0;
2183         int first = 1;
2184         struct net_device *dev;
2185
2186         read_lock(&dev_base_lock);
2187         for(dev=dev_base; dev; dev=dev->next) {
2188                 struct in_device *in_dev = in_dev_get(dev);
2189                 struct ip_mc_list *imc;
2190
2191                 if (in_dev == NULL)
2192                         continue;
2193
2194                 read_lock(&in_dev->lock);
2195
2196                 for (imc=in_dev->mc_list; imc; imc=imc->next) {
2197                         struct ip_sf_list *psf;
2198
2199                         spin_lock_bh(&imc->lock);
2200                         for (psf=imc->sources; psf; psf=psf->sf_next) {
2201                                 if (first) {
2202                                         len += sprintf(buffer+len, "%3s %6s "
2203                                                 "%10s %10s %6s %6s\n", "Idx",
2204                                                 "Device", "MCA", "SRC", "INC",
2205                                                 "EXC");
2206                                         first = 0;
2207                                 }
2208                                 len += sprintf(buffer+len, "%3d %6.6s 0x%08x "
2209                                         "0x%08x %6lu %6lu\n", dev->ifindex,
2210                                         dev->name, ntohl(imc->multiaddr),
2211                                         ntohl(psf->sf_inaddr),
2212                                         psf->sf_count[MCAST_INCLUDE],
2213                                         psf->sf_count[MCAST_EXCLUDE]);
2214                                 pos=begin+len;
2215                                 if(pos<offset)
2216                                 {
2217                                         len=0;
2218                                         begin=pos;
2219                                 }
2220                                 if(pos>offset+length) {
2221                                         spin_unlock_bh(&imc->lock);
2222                                         read_unlock(&in_dev->lock);
2223                                         in_dev_put(in_dev);
2224                                         goto done;
2225                                 }
2226                         }
2227                         spin_unlock_bh(&imc->lock);
2228                 }
2229                 read_unlock(&in_dev->lock);
2230                 in_dev_put(in_dev);
2231         }
2232 done:
2233         read_unlock(&dev_base_lock);
2234
2235         *start=buffer+(offset-begin);
2236         len-=(offset-begin);
2237         if(len>length)
2238                 len=length;
2239         if(len<0)
2240                 len=0;
2241         return len;
2242 }
2243