linux/net/ipv4/igmp.c
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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 *      Authors:
  12 *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  13 *
  14 *      This program is free software; you can redistribute it and/or
  15 *      modify it under the terms of the GNU General Public License
  16 *      as published by the Free Software Foundation; either version
  17 *      2 of the License, or (at your option) any later version.
  18 *
  19 *      Fixes:
  20 *
  21 *              Alan Cox        :       Added lots of __inline__ to optimise
  22 *                                      the memory usage of all the tiny little
  23 *                                      functions.
  24 *              Alan Cox        :       Dumped the header building experiment.
  25 *              Alan Cox        :       Minor tweaks ready for multicast routing
  26 *                                      and extended IGMP protocol.
  27 *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28 *                                      writes utterly bogus code otherwise (sigh)
  29 *                                      fixed IGMP loopback to behave in the manner
  30 *                                      desired by mrouted, fixed the fact it has been
  31 *                                      broken since 1.3.6 and cleaned up a few minor
  32 *                                      points.
  33 *
  34 *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35 *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36 *                                      The enhancements are mainly based on Steve Deering's
  37 *                                      ipmulti-3.5 source code.
  38 *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39 *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40 *                                      the mrouted version on that device.
  41 *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42 *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43 *                                      to identify the multicast router version
  44 *                                      and do what the IGMP version 2 specified.
  45 *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46 *              Tsu-Sheng Tsao          if the specified time expired.
  47 *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48 *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49 *              Christian Daudt :       igmp timer wasn't set for local group
  50 *                                      memberships but was being deleted,
  51 *                                      which caused a "del_timer() called
  52 *                                      from %p with timer not initialized\n"
  53 *                                      message (960131).
  54 *              Christian Daudt :       removed del_timer from
  55 *                                      igmp_timer_expire function (960205).
  56 *             Christian Daudt :       igmp_heard_report now only calls
  57 *                                     igmp_timer_expire if tm->running is
  58 *                                     true (960216).
  59 *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60 *                                      igmp_heard_query never trigger. Expiry
  61 *                                      miscalculation fixed in igmp_heard_query
  62 *                                      and random() made to return unsigned to
  63 *                                      prevent negative expiry times.
  64 *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65 *                                      fix from pending 2.1.x patches.
  66 *              Alan Cox:               Forget to enable FDDI support earlier.
  67 *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68 *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69 *              David L Stevens:        IGMPv3 support, with help from
  70 *                                      Vinay Kulkarni
  71 */
  72
  73#include <linux/module.h>
  74#include <linux/slab.h>
  75#include <asm/uaccess.h>
  76#include <linux/types.h>
  77#include <linux/kernel.h>
  78#include <linux/jiffies.h>
  79#include <linux/string.h>
  80#include <linux/socket.h>
  81#include <linux/sockios.h>
  82#include <linux/in.h>
  83#include <linux/inet.h>
  84#include <linux/netdevice.h>
  85#include <linux/skbuff.h>
  86#include <linux/inetdevice.h>
  87#include <linux/igmp.h>
  88#include <linux/if_arp.h>
  89#include <linux/rtnetlink.h>
  90#include <linux/times.h>
  91
  92#include <net/net_namespace.h>
  93#include <net/arp.h>
  94#include <net/ip.h>
  95#include <net/protocol.h>
  96#include <net/route.h>
  97#include <net/sock.h>
  98#include <net/checksum.h>
  99#include <linux/netfilter_ipv4.h>
 100#ifdef CONFIG_IP_MROUTE
 101#include <linux/mroute.h>
 102#endif
 103#ifdef CONFIG_PROC_FS
 104#include <linux/proc_fs.h>
 105#include <linux/seq_file.h>
 106#endif
 107
 108#define IP_MAX_MEMBERSHIPS      20
 109#define IP_MAX_MSF              10
 110
 111#ifdef CONFIG_IP_MULTICAST
 112/* Parameter names and values are taken from igmp-v2-06 draft */
 113
 114#define IGMP_V1_Router_Present_Timeout          (400*HZ)
 115#define IGMP_V2_Router_Present_Timeout          (400*HZ)
 116#define IGMP_Unsolicited_Report_Interval        (10*HZ)
 117#define IGMP_Query_Response_Interval            (10*HZ)
 118#define IGMP_Unsolicited_Report_Count           2
 119
 120
 121#define IGMP_Initial_Report_Delay               (1)
 122
 123/* IGMP_Initial_Report_Delay is not from IGMP specs!
 124 * IGMP specs require to report membership immediately after
 125 * joining a group, but we delay the first report by a
 126 * small interval. It seems more natural and still does not
 127 * contradict to specs provided this delay is small enough.
 128 */
 129
 130#define IGMP_V1_SEEN(in_dev) \
 131        (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 132         IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 133         ((in_dev)->mr_v1_seen && \
 134          time_before(jiffies, (in_dev)->mr_v1_seen)))
 135#define IGMP_V2_SEEN(in_dev) \
 136        (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 137         IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 138         ((in_dev)->mr_v2_seen && \
 139          time_before(jiffies, (in_dev)->mr_v2_seen)))
 140
 141static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 142static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 143static void igmpv3_clear_delrec(struct in_device *in_dev);
 144static int sf_setstate(struct ip_mc_list *pmc);
 145static void sf_markstate(struct ip_mc_list *pmc);
 146#endif
 147static void ip_mc_clear_src(struct ip_mc_list *pmc);
 148static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 149                         int sfcount, __be32 *psfsrc, int delta);
 150
 151static 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_rcu(im, rcu);
 156        }
 157}
 158
 159#define for_each_pmc_rcu(in_dev, pmc)                           \
 160        for (pmc = rcu_dereference(in_dev->mc_list);            \
 161             pmc != NULL;                                       \
 162             pmc = rcu_dereference(pmc->next_rcu))
 163
 164#define for_each_pmc_rtnl(in_dev, pmc)                          \
 165        for (pmc = rtnl_dereference(in_dev->mc_list);           \
 166             pmc != NULL;                                       \
 167             pmc = rtnl_dereference(pmc->next_rcu))
 168
 169#ifdef CONFIG_IP_MULTICAST
 170
 171/*
 172 *      Timer management
 173 */
 174
 175static void igmp_stop_timer(struct ip_mc_list *im)
 176{
 177        spin_lock_bh(&im->lock);
 178        if (del_timer(&im->timer))
 179                atomic_dec(&im->refcnt);
 180        im->tm_running = 0;
 181        im->reporter = 0;
 182        im->unsolicit_count = 0;
 183        spin_unlock_bh(&im->lock);
 184}
 185
 186/* It must be called with locked im->lock */
 187static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 188{
 189        int tv = net_random() % max_delay;
 190
 191        im->tm_running = 1;
 192        if (!mod_timer(&im->timer, jiffies+tv+2))
 193                atomic_inc(&im->refcnt);
 194}
 195
 196static void igmp_gq_start_timer(struct in_device *in_dev)
 197{
 198        int tv = net_random() % in_dev->mr_maxdelay;
 199
 200        in_dev->mr_gq_running = 1;
 201        if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 202                in_dev_hold(in_dev);
 203}
 204
 205static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 206{
 207        int tv = net_random() % delay;
 208
 209        if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 210                in_dev_hold(in_dev);
 211}
 212
 213static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 214{
 215        spin_lock_bh(&im->lock);
 216        im->unsolicit_count = 0;
 217        if (del_timer(&im->timer)) {
 218                if ((long)(im->timer.expires-jiffies) < max_delay) {
 219                        add_timer(&im->timer);
 220                        im->tm_running = 1;
 221                        spin_unlock_bh(&im->lock);
 222                        return;
 223                }
 224                atomic_dec(&im->refcnt);
 225        }
 226        igmp_start_timer(im, max_delay);
 227        spin_unlock_bh(&im->lock);
 228}
 229
 230
 231/*
 232 *      Send an IGMP report.
 233 */
 234
 235#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 236
 237
 238static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 239        int gdeleted, int sdeleted)
 240{
 241        switch (type) {
 242        case IGMPV3_MODE_IS_INCLUDE:
 243        case IGMPV3_MODE_IS_EXCLUDE:
 244                if (gdeleted || sdeleted)
 245                        return 0;
 246                if (!(pmc->gsquery && !psf->sf_gsresp)) {
 247                        if (pmc->sfmode == MCAST_INCLUDE)
 248                                return 1;
 249                        /* don't include if this source is excluded
 250                         * in all filters
 251                         */
 252                        if (psf->sf_count[MCAST_INCLUDE])
 253                                return type == IGMPV3_MODE_IS_INCLUDE;
 254                        return pmc->sfcount[MCAST_EXCLUDE] ==
 255                                psf->sf_count[MCAST_EXCLUDE];
 256                }
 257                return 0;
 258        case IGMPV3_CHANGE_TO_INCLUDE:
 259                if (gdeleted || sdeleted)
 260                        return 0;
 261                return psf->sf_count[MCAST_INCLUDE] != 0;
 262        case IGMPV3_CHANGE_TO_EXCLUDE:
 263                if (gdeleted || sdeleted)
 264                        return 0;
 265                if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 266                    psf->sf_count[MCAST_INCLUDE])
 267                        return 0;
 268                return pmc->sfcount[MCAST_EXCLUDE] ==
 269                        psf->sf_count[MCAST_EXCLUDE];
 270        case IGMPV3_ALLOW_NEW_SOURCES:
 271                if (gdeleted || !psf->sf_crcount)
 272                        return 0;
 273                return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 274        case IGMPV3_BLOCK_OLD_SOURCES:
 275                if (pmc->sfmode == MCAST_INCLUDE)
 276                        return gdeleted || (psf->sf_crcount && sdeleted);
 277                return psf->sf_crcount && !gdeleted && !sdeleted;
 278        }
 279        return 0;
 280}
 281
 282static int
 283igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 284{
 285        struct ip_sf_list *psf;
 286        int scount = 0;
 287
 288        for (psf=pmc->sources; psf; psf=psf->sf_next) {
 289                if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 290                        continue;
 291                scount++;
 292        }
 293        return scount;
 294}
 295
 296#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
 297
 298static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 299{
 300        struct sk_buff *skb;
 301        struct rtable *rt;
 302        struct iphdr *pip;
 303        struct igmpv3_report *pig;
 304        struct net *net = dev_net(dev);
 305        struct flowi4 fl4;
 306        int hlen = LL_RESERVED_SPACE(dev);
 307        int tlen = dev->needed_tailroom;
 308
 309        while (1) {
 310                skb = alloc_skb(size + hlen + tlen,
 311                                GFP_ATOMIC | __GFP_NOWARN);
 312                if (skb)
 313                        break;
 314                size >>= 1;
 315                if (size < 256)
 316                        return NULL;
 317        }
 318        igmp_skb_size(skb) = size;
 319
 320        rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
 321                                   0, 0,
 322                                   IPPROTO_IGMP, 0, dev->ifindex);
 323        if (IS_ERR(rt)) {
 324                kfree_skb(skb);
 325                return NULL;
 326        }
 327
 328        skb_dst_set(skb, &rt->dst);
 329        skb->dev = dev;
 330
 331        skb_reserve(skb, hlen);
 332
 333        skb_reset_network_header(skb);
 334        pip = ip_hdr(skb);
 335        skb_put(skb, sizeof(struct iphdr) + 4);
 336
 337        pip->version  = 4;
 338        pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 339        pip->tos      = 0xc0;
 340        pip->frag_off = htons(IP_DF);
 341        pip->ttl      = 1;
 342        pip->daddr    = fl4.daddr;
 343        pip->saddr    = fl4.saddr;
 344        pip->protocol = IPPROTO_IGMP;
 345        pip->tot_len  = 0;      /* filled in later */
 346        ip_select_ident(pip, &rt->dst, NULL);
 347        ((u8 *)&pip[1])[0] = IPOPT_RA;
 348        ((u8 *)&pip[1])[1] = 4;
 349        ((u8 *)&pip[1])[2] = 0;
 350        ((u8 *)&pip[1])[3] = 0;
 351
 352        skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 353        skb_put(skb, sizeof(*pig));
 354        pig = igmpv3_report_hdr(skb);
 355        pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 356        pig->resv1 = 0;
 357        pig->csum = 0;
 358        pig->resv2 = 0;
 359        pig->ngrec = 0;
 360        return skb;
 361}
 362
 363static int igmpv3_sendpack(struct sk_buff *skb)
 364{
 365        struct igmphdr *pig = igmp_hdr(skb);
 366        const int igmplen = skb->tail - skb->transport_header;
 367
 368        pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 369
 370        return ip_local_out(skb);
 371}
 372
 373static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 374{
 375        return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 376}
 377
 378static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 379        int type, struct igmpv3_grec **ppgr)
 380{
 381        struct net_device *dev = pmc->interface->dev;
 382        struct igmpv3_report *pih;
 383        struct igmpv3_grec *pgr;
 384
 385        if (!skb)
 386                skb = igmpv3_newpack(dev, dev->mtu);
 387        if (!skb)
 388                return NULL;
 389        pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 390        pgr->grec_type = type;
 391        pgr->grec_auxwords = 0;
 392        pgr->grec_nsrcs = 0;
 393        pgr->grec_mca = pmc->multiaddr;
 394        pih = igmpv3_report_hdr(skb);
 395        pih->ngrec = htons(ntohs(pih->ngrec)+1);
 396        *ppgr = pgr;
 397        return skb;
 398}
 399
 400#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
 401        skb_tailroom(skb)) : 0)
 402
 403static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 404        int type, int gdeleted, int sdeleted)
 405{
 406        struct net_device *dev = pmc->interface->dev;
 407        struct igmpv3_report *pih;
 408        struct igmpv3_grec *pgr = NULL;
 409        struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 410        int scount, stotal, first, isquery, truncate;
 411
 412        if (pmc->multiaddr == IGMP_ALL_HOSTS)
 413                return skb;
 414
 415        isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 416                  type == IGMPV3_MODE_IS_EXCLUDE;
 417        truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 418                    type == IGMPV3_CHANGE_TO_EXCLUDE;
 419
 420        stotal = scount = 0;
 421
 422        psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 423
 424        if (!*psf_list)
 425                goto empty_source;
 426
 427        pih = skb ? igmpv3_report_hdr(skb) : NULL;
 428
 429        /* EX and TO_EX get a fresh packet, if needed */
 430        if (truncate) {
 431                if (pih && pih->ngrec &&
 432                    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 433                        if (skb)
 434                                igmpv3_sendpack(skb);
 435                        skb = igmpv3_newpack(dev, dev->mtu);
 436                }
 437        }
 438        first = 1;
 439        psf_prev = NULL;
 440        for (psf=*psf_list; psf; psf=psf_next) {
 441                __be32 *psrc;
 442
 443                psf_next = psf->sf_next;
 444
 445                if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 446                        psf_prev = psf;
 447                        continue;
 448                }
 449
 450                /* clear marks on query responses */
 451                if (isquery)
 452                        psf->sf_gsresp = 0;
 453
 454                if (AVAILABLE(skb) < sizeof(__be32) +
 455                    first*sizeof(struct igmpv3_grec)) {
 456                        if (truncate && !first)
 457                                break;   /* truncate these */
 458                        if (pgr)
 459                                pgr->grec_nsrcs = htons(scount);
 460                        if (skb)
 461                                igmpv3_sendpack(skb);
 462                        skb = igmpv3_newpack(dev, dev->mtu);
 463                        first = 1;
 464                        scount = 0;
 465                }
 466                if (first) {
 467                        skb = add_grhead(skb, pmc, type, &pgr);
 468                        first = 0;
 469                }
 470                if (!skb)
 471                        return NULL;
 472                psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 473                *psrc = psf->sf_inaddr;
 474                scount++; stotal++;
 475                if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 476                     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 477                        psf->sf_crcount--;
 478                        if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 479                                if (psf_prev)
 480                                        psf_prev->sf_next = psf->sf_next;
 481                                else
 482                                        *psf_list = psf->sf_next;
 483                                kfree(psf);
 484                                continue;
 485                        }
 486                }
 487                psf_prev = psf;
 488        }
 489
 490empty_source:
 491        if (!stotal) {
 492                if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 493                    type == IGMPV3_BLOCK_OLD_SOURCES)
 494                        return skb;
 495                if (pmc->crcount || isquery) {
 496                        /* make sure we have room for group header */
 497                        if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 498                                igmpv3_sendpack(skb);
 499                                skb = NULL; /* add_grhead will get a new one */
 500                        }
 501                        skb = add_grhead(skb, pmc, type, &pgr);
 502                }
 503        }
 504        if (pgr)
 505                pgr->grec_nsrcs = htons(scount);
 506
 507        if (isquery)
 508                pmc->gsquery = 0;       /* clear query state on report */
 509        return skb;
 510}
 511
 512static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 513{
 514        struct sk_buff *skb = NULL;
 515        int type;
 516
 517        if (!pmc) {
 518                rcu_read_lock();
 519                for_each_pmc_rcu(in_dev, pmc) {
 520                        if (pmc->multiaddr == IGMP_ALL_HOSTS)
 521                                continue;
 522                        spin_lock_bh(&pmc->lock);
 523                        if (pmc->sfcount[MCAST_EXCLUDE])
 524                                type = IGMPV3_MODE_IS_EXCLUDE;
 525                        else
 526                                type = IGMPV3_MODE_IS_INCLUDE;
 527                        skb = add_grec(skb, pmc, type, 0, 0);
 528                        spin_unlock_bh(&pmc->lock);
 529                }
 530                rcu_read_unlock();
 531        } else {
 532                spin_lock_bh(&pmc->lock);
 533                if (pmc->sfcount[MCAST_EXCLUDE])
 534                        type = IGMPV3_MODE_IS_EXCLUDE;
 535                else
 536                        type = IGMPV3_MODE_IS_INCLUDE;
 537                skb = add_grec(skb, pmc, type, 0, 0);
 538                spin_unlock_bh(&pmc->lock);
 539        }
 540        if (!skb)
 541                return 0;
 542        return igmpv3_sendpack(skb);
 543}
 544
 545/*
 546 * remove zero-count source records from a source filter list
 547 */
 548static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 549{
 550        struct ip_sf_list *psf_prev, *psf_next, *psf;
 551
 552        psf_prev = NULL;
 553        for (psf=*ppsf; psf; psf = psf_next) {
 554                psf_next = psf->sf_next;
 555                if (psf->sf_crcount == 0) {
 556                        if (psf_prev)
 557                                psf_prev->sf_next = psf->sf_next;
 558                        else
 559                                *ppsf = psf->sf_next;
 560                        kfree(psf);
 561                } else
 562                        psf_prev = psf;
 563        }
 564}
 565
 566static void igmpv3_send_cr(struct in_device *in_dev)
 567{
 568        struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 569        struct sk_buff *skb = NULL;
 570        int type, dtype;
 571
 572        rcu_read_lock();
 573        spin_lock_bh(&in_dev->mc_tomb_lock);
 574
 575        /* deleted MCA's */
 576        pmc_prev = NULL;
 577        for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 578                pmc_next = pmc->next;
 579                if (pmc->sfmode == MCAST_INCLUDE) {
 580                        type = IGMPV3_BLOCK_OLD_SOURCES;
 581                        dtype = IGMPV3_BLOCK_OLD_SOURCES;
 582                        skb = add_grec(skb, pmc, type, 1, 0);
 583                        skb = add_grec(skb, pmc, dtype, 1, 1);
 584                }
 585                if (pmc->crcount) {
 586                        if (pmc->sfmode == MCAST_EXCLUDE) {
 587                                type = IGMPV3_CHANGE_TO_INCLUDE;
 588                                skb = add_grec(skb, pmc, type, 1, 0);
 589                        }
 590                        pmc->crcount--;
 591                        if (pmc->crcount == 0) {
 592                                igmpv3_clear_zeros(&pmc->tomb);
 593                                igmpv3_clear_zeros(&pmc->sources);
 594                        }
 595                }
 596                if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 597                        if (pmc_prev)
 598                                pmc_prev->next = pmc_next;
 599                        else
 600                                in_dev->mc_tomb = pmc_next;
 601                        in_dev_put(pmc->interface);
 602                        kfree(pmc);
 603                } else
 604                        pmc_prev = pmc;
 605        }
 606        spin_unlock_bh(&in_dev->mc_tomb_lock);
 607
 608        /* change recs */
 609        for_each_pmc_rcu(in_dev, pmc) {
 610                spin_lock_bh(&pmc->lock);
 611                if (pmc->sfcount[MCAST_EXCLUDE]) {
 612                        type = IGMPV3_BLOCK_OLD_SOURCES;
 613                        dtype = IGMPV3_ALLOW_NEW_SOURCES;
 614                } else {
 615                        type = IGMPV3_ALLOW_NEW_SOURCES;
 616                        dtype = IGMPV3_BLOCK_OLD_SOURCES;
 617                }
 618                skb = add_grec(skb, pmc, type, 0, 0);
 619                skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 620
 621                /* filter mode changes */
 622                if (pmc->crcount) {
 623                        if (pmc->sfmode == MCAST_EXCLUDE)
 624                                type = IGMPV3_CHANGE_TO_EXCLUDE;
 625                        else
 626                                type = IGMPV3_CHANGE_TO_INCLUDE;
 627                        skb = add_grec(skb, pmc, type, 0, 0);
 628                        pmc->crcount--;
 629                }
 630                spin_unlock_bh(&pmc->lock);
 631        }
 632        rcu_read_unlock();
 633
 634        if (!skb)
 635                return;
 636        (void) igmpv3_sendpack(skb);
 637}
 638
 639static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 640        int type)
 641{
 642        struct sk_buff *skb;
 643        struct iphdr *iph;
 644        struct igmphdr *ih;
 645        struct rtable *rt;
 646        struct net_device *dev = in_dev->dev;
 647        struct net *net = dev_net(dev);
 648        __be32  group = pmc ? pmc->multiaddr : 0;
 649        struct flowi4 fl4;
 650        __be32  dst;
 651        int hlen, tlen;
 652
 653        if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 654                return igmpv3_send_report(in_dev, pmc);
 655        else if (type == IGMP_HOST_LEAVE_MESSAGE)
 656                dst = IGMP_ALL_ROUTER;
 657        else
 658                dst = group;
 659
 660        rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
 661                                   0, 0,
 662                                   IPPROTO_IGMP, 0, dev->ifindex);
 663        if (IS_ERR(rt))
 664                return -1;
 665
 666        hlen = LL_RESERVED_SPACE(dev);
 667        tlen = dev->needed_tailroom;
 668        skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
 669        if (skb == NULL) {
 670                ip_rt_put(rt);
 671                return -1;
 672        }
 673
 674        skb_dst_set(skb, &rt->dst);
 675
 676        skb_reserve(skb, hlen);
 677
 678        skb_reset_network_header(skb);
 679        iph = ip_hdr(skb);
 680        skb_put(skb, sizeof(struct iphdr) + 4);
 681
 682        iph->version  = 4;
 683        iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 684        iph->tos      = 0xc0;
 685        iph->frag_off = htons(IP_DF);
 686        iph->ttl      = 1;
 687        iph->daddr    = dst;
 688        iph->saddr    = fl4.saddr;
 689        iph->protocol = IPPROTO_IGMP;
 690        ip_select_ident(iph, &rt->dst, NULL);
 691        ((u8 *)&iph[1])[0] = IPOPT_RA;
 692        ((u8 *)&iph[1])[1] = 4;
 693        ((u8 *)&iph[1])[2] = 0;
 694        ((u8 *)&iph[1])[3] = 0;
 695
 696        ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 697        ih->type = type;
 698        ih->code = 0;
 699        ih->csum = 0;
 700        ih->group = group;
 701        ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 702
 703        return ip_local_out(skb);
 704}
 705
 706static void igmp_gq_timer_expire(unsigned long data)
 707{
 708        struct in_device *in_dev = (struct in_device *)data;
 709
 710        in_dev->mr_gq_running = 0;
 711        igmpv3_send_report(in_dev, NULL);
 712        __in_dev_put(in_dev);
 713}
 714
 715static void igmp_ifc_timer_expire(unsigned long data)
 716{
 717        struct in_device *in_dev = (struct in_device *)data;
 718
 719        igmpv3_send_cr(in_dev);
 720        if (in_dev->mr_ifc_count) {
 721                in_dev->mr_ifc_count--;
 722                igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 723        }
 724        __in_dev_put(in_dev);
 725}
 726
 727static void igmp_ifc_event(struct in_device *in_dev)
 728{
 729        if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 730                return;
 731        in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 732                IGMP_Unsolicited_Report_Count;
 733        igmp_ifc_start_timer(in_dev, 1);
 734}
 735
 736
 737static void igmp_timer_expire(unsigned long data)
 738{
 739        struct ip_mc_list *im=(struct ip_mc_list *)data;
 740        struct in_device *in_dev = im->interface;
 741
 742        spin_lock(&im->lock);
 743        im->tm_running = 0;
 744
 745        if (im->unsolicit_count) {
 746                im->unsolicit_count--;
 747                igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 748        }
 749        im->reporter = 1;
 750        spin_unlock(&im->lock);
 751
 752        if (IGMP_V1_SEEN(in_dev))
 753                igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 754        else if (IGMP_V2_SEEN(in_dev))
 755                igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 756        else
 757                igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 758
 759        ip_ma_put(im);
 760}
 761
 762/* mark EXCLUDE-mode sources */
 763static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 764{
 765        struct ip_sf_list *psf;
 766        int i, scount;
 767
 768        scount = 0;
 769        for (psf=pmc->sources; psf; psf=psf->sf_next) {
 770                if (scount == nsrcs)
 771                        break;
 772                for (i=0; i<nsrcs; i++) {
 773                        /* skip inactive filters */
 774                        if (psf->sf_count[MCAST_INCLUDE] ||
 775                            pmc->sfcount[MCAST_EXCLUDE] !=
 776                            psf->sf_count[MCAST_EXCLUDE])
 777                                break;
 778                        if (srcs[i] == psf->sf_inaddr) {
 779                                scount++;
 780                                break;
 781                        }
 782                }
 783        }
 784        pmc->gsquery = 0;
 785        if (scount == nsrcs)    /* all sources excluded */
 786                return 0;
 787        return 1;
 788}
 789
 790static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 791{
 792        struct ip_sf_list *psf;
 793        int i, scount;
 794
 795        if (pmc->sfmode == MCAST_EXCLUDE)
 796                return igmp_xmarksources(pmc, nsrcs, srcs);
 797
 798        /* mark INCLUDE-mode sources */
 799        scount = 0;
 800        for (psf=pmc->sources; psf; psf=psf->sf_next) {
 801                if (scount == nsrcs)
 802                        break;
 803                for (i=0; i<nsrcs; i++)
 804                        if (srcs[i] == psf->sf_inaddr) {
 805                                psf->sf_gsresp = 1;
 806                                scount++;
 807                                break;
 808                        }
 809        }
 810        if (!scount) {
 811                pmc->gsquery = 0;
 812                return 0;
 813        }
 814        pmc->gsquery = 1;
 815        return 1;
 816}
 817
 818/* return true if packet was dropped */
 819static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
 820{
 821        struct ip_mc_list *im;
 822
 823        /* Timers are only set for non-local groups */
 824
 825        if (group == IGMP_ALL_HOSTS)
 826                return false;
 827
 828        rcu_read_lock();
 829        for_each_pmc_rcu(in_dev, im) {
 830                if (im->multiaddr == group) {
 831                        igmp_stop_timer(im);
 832                        break;
 833                }
 834        }
 835        rcu_read_unlock();
 836        return false;
 837}
 838
 839/* return true if packet was dropped */
 840static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 841        int len)
 842{
 843        struct igmphdr          *ih = igmp_hdr(skb);
 844        struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 845        struct ip_mc_list       *im;
 846        __be32                  group = ih->group;
 847        int                     max_delay;
 848        int                     mark = 0;
 849
 850
 851        if (len == 8) {
 852                if (ih->code == 0) {
 853                        /* Alas, old v1 router presents here. */
 854
 855                        max_delay = IGMP_Query_Response_Interval;
 856                        in_dev->mr_v1_seen = jiffies +
 857                                IGMP_V1_Router_Present_Timeout;
 858                        group = 0;
 859                } else {
 860                        /* v2 router present */
 861                        max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 862                        in_dev->mr_v2_seen = jiffies +
 863                                IGMP_V2_Router_Present_Timeout;
 864                }
 865                /* cancel the interface change timer */
 866                in_dev->mr_ifc_count = 0;
 867                if (del_timer(&in_dev->mr_ifc_timer))
 868                        __in_dev_put(in_dev);
 869                /* clear deleted report items */
 870                igmpv3_clear_delrec(in_dev);
 871        } else if (len < 12) {
 872                return true;    /* ignore bogus packet; freed by caller */
 873        } else if (IGMP_V1_SEEN(in_dev)) {
 874                /* This is a v3 query with v1 queriers present */
 875                max_delay = IGMP_Query_Response_Interval;
 876                group = 0;
 877        } else if (IGMP_V2_SEEN(in_dev)) {
 878                /* this is a v3 query with v2 queriers present;
 879                 * Interpretation of the max_delay code is problematic here.
 880                 * A real v2 host would use ih_code directly, while v3 has a
 881                 * different encoding. We use the v3 encoding as more likely
 882                 * to be intended in a v3 query.
 883                 */
 884                max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 885                if (!max_delay)
 886                        max_delay = 1;  /* can't mod w/ 0 */
 887        } else { /* v3 */
 888                if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 889                        return true;
 890
 891                ih3 = igmpv3_query_hdr(skb);
 892                if (ih3->nsrcs) {
 893                        if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 894                                           + ntohs(ih3->nsrcs)*sizeof(__be32)))
 895                                return true;
 896                        ih3 = igmpv3_query_hdr(skb);
 897                }
 898
 899                max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 900                if (!max_delay)
 901                        max_delay = 1;  /* can't mod w/ 0 */
 902                in_dev->mr_maxdelay = max_delay;
 903                if (ih3->qrv)
 904                        in_dev->mr_qrv = ih3->qrv;
 905                if (!group) { /* general query */
 906                        if (ih3->nsrcs)
 907                                return false;   /* no sources allowed */
 908                        igmp_gq_start_timer(in_dev);
 909                        return false;
 910                }
 911                /* mark sources to include, if group & source-specific */
 912                mark = ih3->nsrcs != 0;
 913        }
 914
 915        /*
 916         * - Start the timers in all of our membership records
 917         *   that the query applies to for the interface on
 918         *   which the query arrived excl. those that belong
 919         *   to a "local" group (224.0.0.X)
 920         * - For timers already running check if they need to
 921         *   be reset.
 922         * - Use the igmp->igmp_code field as the maximum
 923         *   delay possible
 924         */
 925        rcu_read_lock();
 926        for_each_pmc_rcu(in_dev, im) {
 927                int changed;
 928
 929                if (group && group != im->multiaddr)
 930                        continue;
 931                if (im->multiaddr == IGMP_ALL_HOSTS)
 932                        continue;
 933                spin_lock_bh(&im->lock);
 934                if (im->tm_running)
 935                        im->gsquery = im->gsquery && mark;
 936                else
 937                        im->gsquery = mark;
 938                changed = !im->gsquery ||
 939                        igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 940                spin_unlock_bh(&im->lock);
 941                if (changed)
 942                        igmp_mod_timer(im, max_delay);
 943        }
 944        rcu_read_unlock();
 945        return false;
 946}
 947
 948/* called in rcu_read_lock() section */
 949int igmp_rcv(struct sk_buff *skb)
 950{
 951        /* This basically follows the spec line by line -- see RFC1112 */
 952        struct igmphdr *ih;
 953        struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 954        int len = skb->len;
 955        bool dropped = true;
 956
 957        if (in_dev == NULL)
 958                goto drop;
 959
 960        if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 961                goto drop;
 962
 963        switch (skb->ip_summed) {
 964        case CHECKSUM_COMPLETE:
 965                if (!csum_fold(skb->csum))
 966                        break;
 967                /* fall through */
 968        case CHECKSUM_NONE:
 969                skb->csum = 0;
 970                if (__skb_checksum_complete(skb))
 971                        goto drop;
 972        }
 973
 974        ih = igmp_hdr(skb);
 975        switch (ih->type) {
 976        case IGMP_HOST_MEMBERSHIP_QUERY:
 977                dropped = igmp_heard_query(in_dev, skb, len);
 978                break;
 979        case IGMP_HOST_MEMBERSHIP_REPORT:
 980        case IGMPV2_HOST_MEMBERSHIP_REPORT:
 981                /* Is it our report looped back? */
 982                if (rt_is_output_route(skb_rtable(skb)))
 983                        break;
 984                /* don't rely on MC router hearing unicast reports */
 985                if (skb->pkt_type == PACKET_MULTICAST ||
 986                    skb->pkt_type == PACKET_BROADCAST)
 987                        dropped = igmp_heard_report(in_dev, ih->group);
 988                break;
 989        case IGMP_PIM:
 990#ifdef CONFIG_IP_PIMSM_V1
 991                return pim_rcv_v1(skb);
 992#endif
 993        case IGMPV3_HOST_MEMBERSHIP_REPORT:
 994        case IGMP_DVMRP:
 995        case IGMP_TRACE:
 996        case IGMP_HOST_LEAVE_MESSAGE:
 997        case IGMP_MTRACE:
 998        case IGMP_MTRACE_RESP:
 999                break;
1000        default:
1001                break;
1002        }
1003
1004drop:
1005        if (dropped)
1006                kfree_skb(skb);
1007        else
1008                consume_skb(skb);
1009        return 0;
1010}
1011
1012#endif
1013
1014
1015/*
1016 *      Add a filter to a device
1017 */
1018
1019static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1020{
1021        char buf[MAX_ADDR_LEN];
1022        struct net_device *dev = in_dev->dev;
1023
1024        /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1025           We will get multicast token leakage, when IFF_MULTICAST
1026           is changed. This check should be done in ndo_set_rx_mode
1027           routine. Something sort of:
1028           if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1029           --ANK
1030           */
1031        if (arp_mc_map(addr, buf, dev, 0) == 0)
1032                dev_mc_add(dev, buf);
1033}
1034
1035/*
1036 *      Remove a filter from a device
1037 */
1038
1039static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1040{
1041        char buf[MAX_ADDR_LEN];
1042        struct net_device *dev = in_dev->dev;
1043
1044        if (arp_mc_map(addr, buf, dev, 0) == 0)
1045                dev_mc_del(dev, buf);
1046}
1047
1048#ifdef CONFIG_IP_MULTICAST
1049/*
1050 * deleted ip_mc_list manipulation
1051 */
1052static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1053{
1054        struct ip_mc_list *pmc;
1055
1056        /* this is an "ip_mc_list" for convenience; only the fields below
1057         * are actually used. In particular, the refcnt and users are not
1058         * used for management of the delete list. Using the same structure
1059         * for deleted items allows change reports to use common code with
1060         * non-deleted or query-response MCA's.
1061         */
1062        pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1063        if (!pmc)
1064                return;
1065        spin_lock_bh(&im->lock);
1066        pmc->interface = im->interface;
1067        in_dev_hold(in_dev);
1068        pmc->multiaddr = im->multiaddr;
1069        pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1070                IGMP_Unsolicited_Report_Count;
1071        pmc->sfmode = im->sfmode;
1072        if (pmc->sfmode == MCAST_INCLUDE) {
1073                struct ip_sf_list *psf;
1074
1075                pmc->tomb = im->tomb;
1076                pmc->sources = im->sources;
1077                im->tomb = im->sources = NULL;
1078                for (psf=pmc->sources; psf; psf=psf->sf_next)
1079                        psf->sf_crcount = pmc->crcount;
1080        }
1081        spin_unlock_bh(&im->lock);
1082
1083        spin_lock_bh(&in_dev->mc_tomb_lock);
1084        pmc->next = in_dev->mc_tomb;
1085        in_dev->mc_tomb = pmc;
1086        spin_unlock_bh(&in_dev->mc_tomb_lock);
1087}
1088
1089static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1090{
1091        struct ip_mc_list *pmc, *pmc_prev;
1092        struct ip_sf_list *psf, *psf_next;
1093
1094        spin_lock_bh(&in_dev->mc_tomb_lock);
1095        pmc_prev = NULL;
1096        for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1097                if (pmc->multiaddr == multiaddr)
1098                        break;
1099                pmc_prev = pmc;
1100        }
1101        if (pmc) {
1102                if (pmc_prev)
1103                        pmc_prev->next = pmc->next;
1104                else
1105                        in_dev->mc_tomb = pmc->next;
1106        }
1107        spin_unlock_bh(&in_dev->mc_tomb_lock);
1108        if (pmc) {
1109                for (psf=pmc->tomb; psf; psf=psf_next) {
1110                        psf_next = psf->sf_next;
1111                        kfree(psf);
1112                }
1113                in_dev_put(pmc->interface);
1114                kfree(pmc);
1115        }
1116}
1117
1118static void igmpv3_clear_delrec(struct in_device *in_dev)
1119{
1120        struct ip_mc_list *pmc, *nextpmc;
1121
1122        spin_lock_bh(&in_dev->mc_tomb_lock);
1123        pmc = in_dev->mc_tomb;
1124        in_dev->mc_tomb = NULL;
1125        spin_unlock_bh(&in_dev->mc_tomb_lock);
1126
1127        for (; pmc; pmc = nextpmc) {
1128                nextpmc = pmc->next;
1129                ip_mc_clear_src(pmc);
1130                in_dev_put(pmc->interface);
1131                kfree(pmc);
1132        }
1133        /* clear dead sources, too */
1134        rcu_read_lock();
1135        for_each_pmc_rcu(in_dev, pmc) {
1136                struct ip_sf_list *psf, *psf_next;
1137
1138                spin_lock_bh(&pmc->lock);
1139                psf = pmc->tomb;
1140                pmc->tomb = NULL;
1141                spin_unlock_bh(&pmc->lock);
1142                for (; psf; psf=psf_next) {
1143                        psf_next = psf->sf_next;
1144                        kfree(psf);
1145                }
1146        }
1147        rcu_read_unlock();
1148}
1149#endif
1150
1151static void igmp_group_dropped(struct ip_mc_list *im)
1152{
1153        struct in_device *in_dev = im->interface;
1154#ifdef CONFIG_IP_MULTICAST
1155        int reporter;
1156#endif
1157
1158        if (im->loaded) {
1159                im->loaded = 0;
1160                ip_mc_filter_del(in_dev, im->multiaddr);
1161        }
1162
1163#ifdef CONFIG_IP_MULTICAST
1164        if (im->multiaddr == IGMP_ALL_HOSTS)
1165                return;
1166
1167        reporter = im->reporter;
1168        igmp_stop_timer(im);
1169
1170        if (!in_dev->dead) {
1171                if (IGMP_V1_SEEN(in_dev))
1172                        return;
1173                if (IGMP_V2_SEEN(in_dev)) {
1174                        if (reporter)
1175                                igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1176                        return;
1177                }
1178                /* IGMPv3 */
1179                igmpv3_add_delrec(in_dev, im);
1180
1181                igmp_ifc_event(in_dev);
1182        }
1183#endif
1184}
1185
1186static void igmp_group_added(struct ip_mc_list *im)
1187{
1188        struct in_device *in_dev = im->interface;
1189
1190        if (im->loaded == 0) {
1191                im->loaded = 1;
1192                ip_mc_filter_add(in_dev, im->multiaddr);
1193        }
1194
1195#ifdef CONFIG_IP_MULTICAST
1196        if (im->multiaddr == IGMP_ALL_HOSTS)
1197                return;
1198
1199        if (in_dev->dead)
1200                return;
1201        if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1202                spin_lock_bh(&im->lock);
1203                igmp_start_timer(im, IGMP_Initial_Report_Delay);
1204                spin_unlock_bh(&im->lock);
1205                return;
1206        }
1207        /* else, v3 */
1208
1209        im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1210                IGMP_Unsolicited_Report_Count;
1211        igmp_ifc_event(in_dev);
1212#endif
1213}
1214
1215
1216/*
1217 *      Multicast list managers
1218 */
1219
1220
1221/*
1222 *      A socket has joined a multicast group on device dev.
1223 */
1224
1225void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1226{
1227        struct ip_mc_list *im;
1228
1229        ASSERT_RTNL();
1230
1231        for_each_pmc_rtnl(in_dev, im) {
1232                if (im->multiaddr == addr) {
1233                        im->users++;
1234                        ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1235                        goto out;
1236                }
1237        }
1238
1239        im = kzalloc(sizeof(*im), GFP_KERNEL);
1240        if (!im)
1241                goto out;
1242
1243        im->users = 1;
1244        im->interface = in_dev;
1245        in_dev_hold(in_dev);
1246        im->multiaddr = addr;
1247        /* initial mode is (EX, empty) */
1248        im->sfmode = MCAST_EXCLUDE;
1249        im->sfcount[MCAST_EXCLUDE] = 1;
1250        atomic_set(&im->refcnt, 1);
1251        spin_lock_init(&im->lock);
1252#ifdef CONFIG_IP_MULTICAST
1253        setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1254        im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1255#endif
1256
1257        im->next_rcu = in_dev->mc_list;
1258        in_dev->mc_count++;
1259        rcu_assign_pointer(in_dev->mc_list, im);
1260
1261#ifdef CONFIG_IP_MULTICAST
1262        igmpv3_del_delrec(in_dev, im->multiaddr);
1263#endif
1264        igmp_group_added(im);
1265        if (!in_dev->dead)
1266                ip_rt_multicast_event(in_dev);
1267out:
1268        return;
1269}
1270EXPORT_SYMBOL(ip_mc_inc_group);
1271
1272/*
1273 *      Resend IGMP JOIN report; used for bonding.
1274 *      Called with rcu_read_lock()
1275 */
1276void ip_mc_rejoin_groups(struct in_device *in_dev)
1277{
1278#ifdef CONFIG_IP_MULTICAST
1279        struct ip_mc_list *im;
1280        int type;
1281
1282        for_each_pmc_rcu(in_dev, im) {
1283                if (im->multiaddr == IGMP_ALL_HOSTS)
1284                        continue;
1285
1286                /* a failover is happening and switches
1287                 * must be notified immediately
1288                 */
1289                if (IGMP_V1_SEEN(in_dev))
1290                        type = IGMP_HOST_MEMBERSHIP_REPORT;
1291                else if (IGMP_V2_SEEN(in_dev))
1292                        type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1293                else
1294                        type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1295                igmp_send_report(in_dev, im, type);
1296        }
1297#endif
1298}
1299EXPORT_SYMBOL(ip_mc_rejoin_groups);
1300
1301/*
1302 *      A socket has left a multicast group on device dev
1303 */
1304
1305void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1306{
1307        struct ip_mc_list *i;
1308        struct ip_mc_list __rcu **ip;
1309
1310        ASSERT_RTNL();
1311
1312        for (ip = &in_dev->mc_list;
1313             (i = rtnl_dereference(*ip)) != NULL;
1314             ip = &i->next_rcu) {
1315                if (i->multiaddr == addr) {
1316                        if (--i->users == 0) {
1317                                *ip = i->next_rcu;
1318                                in_dev->mc_count--;
1319                                igmp_group_dropped(i);
1320                                ip_mc_clear_src(i);
1321
1322                                if (!in_dev->dead)
1323                                        ip_rt_multicast_event(in_dev);
1324
1325                                ip_ma_put(i);
1326                                return;
1327                        }
1328                        break;
1329                }
1330        }
1331}
1332EXPORT_SYMBOL(ip_mc_dec_group);
1333
1334/* Device changing type */
1335
1336void ip_mc_unmap(struct in_device *in_dev)
1337{
1338        struct ip_mc_list *pmc;
1339
1340        ASSERT_RTNL();
1341
1342        for_each_pmc_rtnl(in_dev, pmc)
1343                igmp_group_dropped(pmc);
1344}
1345
1346void ip_mc_remap(struct in_device *in_dev)
1347{
1348        struct ip_mc_list *pmc;
1349
1350        ASSERT_RTNL();
1351
1352        for_each_pmc_rtnl(in_dev, pmc)
1353                igmp_group_added(pmc);
1354}
1355
1356/* Device going down */
1357
1358void ip_mc_down(struct in_device *in_dev)
1359{
1360        struct ip_mc_list *pmc;
1361
1362        ASSERT_RTNL();
1363
1364        for_each_pmc_rtnl(in_dev, pmc)
1365                igmp_group_dropped(pmc);
1366
1367#ifdef CONFIG_IP_MULTICAST
1368        in_dev->mr_ifc_count = 0;
1369        if (del_timer(&in_dev->mr_ifc_timer))
1370                __in_dev_put(in_dev);
1371        in_dev->mr_gq_running = 0;
1372        if (del_timer(&in_dev->mr_gq_timer))
1373                __in_dev_put(in_dev);
1374        igmpv3_clear_delrec(in_dev);
1375#endif
1376
1377        ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1378}
1379
1380void ip_mc_init_dev(struct in_device *in_dev)
1381{
1382        ASSERT_RTNL();
1383
1384        in_dev->mc_tomb = NULL;
1385#ifdef CONFIG_IP_MULTICAST
1386        in_dev->mr_gq_running = 0;
1387        setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1388                        (unsigned long)in_dev);
1389        in_dev->mr_ifc_count = 0;
1390        in_dev->mc_count     = 0;
1391        setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1392                        (unsigned long)in_dev);
1393        in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1394#endif
1395
1396        spin_lock_init(&in_dev->mc_tomb_lock);
1397}
1398
1399/* Device going up */
1400
1401void ip_mc_up(struct in_device *in_dev)
1402{
1403        struct ip_mc_list *pmc;
1404
1405        ASSERT_RTNL();
1406
1407        ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1408
1409        for_each_pmc_rtnl(in_dev, pmc)
1410                igmp_group_added(pmc);
1411}
1412
1413/*
1414 *      Device is about to be destroyed: clean up.
1415 */
1416
1417void ip_mc_destroy_dev(struct in_device *in_dev)
1418{
1419        struct ip_mc_list *i;
1420
1421        ASSERT_RTNL();
1422
1423        /* Deactivate timers */
1424        ip_mc_down(in_dev);
1425
1426        while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1427                in_dev->mc_list = i->next_rcu;
1428                in_dev->mc_count--;
1429
1430                /* We've dropped the groups in ip_mc_down already */
1431                ip_mc_clear_src(i);
1432                ip_ma_put(i);
1433        }
1434}
1435
1436/* RTNL is locked */
1437static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1438{
1439        struct net_device *dev = NULL;
1440        struct in_device *idev = NULL;
1441
1442        if (imr->imr_ifindex) {
1443                idev = inetdev_by_index(net, imr->imr_ifindex);
1444                return idev;
1445        }
1446        if (imr->imr_address.s_addr) {
1447                dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1448                if (!dev)
1449                        return NULL;
1450        }
1451
1452        if (!dev) {
1453                struct rtable *rt = ip_route_output(net,
1454                                                    imr->imr_multiaddr.s_addr,
1455                                                    0, 0, 0);
1456                if (!IS_ERR(rt)) {
1457                        dev = rt->dst.dev;
1458                        ip_rt_put(rt);
1459                }
1460        }
1461        if (dev) {
1462                imr->imr_ifindex = dev->ifindex;
1463                idev = __in_dev_get_rtnl(dev);
1464        }
1465        return idev;
1466}
1467
1468/*
1469 *      Join a socket to a group
1470 */
1471int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1472int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1473
1474
1475static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1476        __be32 *psfsrc)
1477{
1478        struct ip_sf_list *psf, *psf_prev;
1479        int rv = 0;
1480
1481        psf_prev = NULL;
1482        for (psf=pmc->sources; psf; psf=psf->sf_next) {
1483                if (psf->sf_inaddr == *psfsrc)
1484                        break;
1485                psf_prev = psf;
1486        }
1487        if (!psf || psf->sf_count[sfmode] == 0) {
1488                /* source filter not found, or count wrong =>  bug */
1489                return -ESRCH;
1490        }
1491        psf->sf_count[sfmode]--;
1492        if (psf->sf_count[sfmode] == 0) {
1493                ip_rt_multicast_event(pmc->interface);
1494        }
1495        if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1496#ifdef CONFIG_IP_MULTICAST
1497                struct in_device *in_dev = pmc->interface;
1498#endif
1499
1500                /* no more filters for this source */
1501                if (psf_prev)
1502                        psf_prev->sf_next = psf->sf_next;
1503                else
1504                        pmc->sources = psf->sf_next;
1505#ifdef CONFIG_IP_MULTICAST
1506                if (psf->sf_oldin &&
1507                    !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1508                        psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1509                                IGMP_Unsolicited_Report_Count;
1510                        psf->sf_next = pmc->tomb;
1511                        pmc->tomb = psf;
1512                        rv = 1;
1513                } else
1514#endif
1515                        kfree(psf);
1516        }
1517        return rv;
1518}
1519
1520#ifndef CONFIG_IP_MULTICAST
1521#define igmp_ifc_event(x)       do { } while (0)
1522#endif
1523
1524static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1525                         int sfcount, __be32 *psfsrc, int delta)
1526{
1527        struct ip_mc_list *pmc;
1528        int     changerec = 0;
1529        int     i, err;
1530
1531        if (!in_dev)
1532                return -ENODEV;
1533        rcu_read_lock();
1534        for_each_pmc_rcu(in_dev, pmc) {
1535                if (*pmca == pmc->multiaddr)
1536                        break;
1537        }
1538        if (!pmc) {
1539                /* MCA not found?? bug */
1540                rcu_read_unlock();
1541                return -ESRCH;
1542        }
1543        spin_lock_bh(&pmc->lock);
1544        rcu_read_unlock();
1545#ifdef CONFIG_IP_MULTICAST
1546        sf_markstate(pmc);
1547#endif
1548        if (!delta) {
1549                err = -EINVAL;
1550                if (!pmc->sfcount[sfmode])
1551                        goto out_unlock;
1552                pmc->sfcount[sfmode]--;
1553        }
1554        err = 0;
1555        for (i=0; i<sfcount; i++) {
1556                int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1557
1558                changerec |= rv > 0;
1559                if (!err && rv < 0)
1560                        err = rv;
1561        }
1562        if (pmc->sfmode == MCAST_EXCLUDE &&
1563            pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1564            pmc->sfcount[MCAST_INCLUDE]) {
1565#ifdef CONFIG_IP_MULTICAST
1566                struct ip_sf_list *psf;
1567#endif
1568
1569                /* filter mode change */
1570                pmc->sfmode = MCAST_INCLUDE;
1571#ifdef CONFIG_IP_MULTICAST
1572                pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1573                        IGMP_Unsolicited_Report_Count;
1574                in_dev->mr_ifc_count = pmc->crcount;
1575                for (psf=pmc->sources; psf; psf = psf->sf_next)
1576                        psf->sf_crcount = 0;
1577                igmp_ifc_event(pmc->interface);
1578        } else if (sf_setstate(pmc) || changerec) {
1579                igmp_ifc_event(pmc->interface);
1580#endif
1581        }
1582out_unlock:
1583        spin_unlock_bh(&pmc->lock);
1584        return err;
1585}
1586
1587/*
1588 * Add multicast single-source filter to the interface list
1589 */
1590static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1591        __be32 *psfsrc)
1592{
1593        struct ip_sf_list *psf, *psf_prev;
1594
1595        psf_prev = NULL;
1596        for (psf=pmc->sources; psf; psf=psf->sf_next) {
1597                if (psf->sf_inaddr == *psfsrc)
1598                        break;
1599                psf_prev = psf;
1600        }
1601        if (!psf) {
1602                psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1603                if (!psf)
1604                        return -ENOBUFS;
1605                psf->sf_inaddr = *psfsrc;
1606                if (psf_prev) {
1607                        psf_prev->sf_next = psf;
1608                } else
1609                        pmc->sources = psf;
1610        }
1611        psf->sf_count[sfmode]++;
1612        if (psf->sf_count[sfmode] == 1) {
1613                ip_rt_multicast_event(pmc->interface);
1614        }
1615        return 0;
1616}
1617
1618#ifdef CONFIG_IP_MULTICAST
1619static void sf_markstate(struct ip_mc_list *pmc)
1620{
1621        struct ip_sf_list *psf;
1622        int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1623
1624        for (psf=pmc->sources; psf; psf=psf->sf_next)
1625                if (pmc->sfcount[MCAST_EXCLUDE]) {
1626                        psf->sf_oldin = mca_xcount ==
1627                                psf->sf_count[MCAST_EXCLUDE] &&
1628                                !psf->sf_count[MCAST_INCLUDE];
1629                } else
1630                        psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1631}
1632
1633static int sf_setstate(struct ip_mc_list *pmc)
1634{
1635        struct ip_sf_list *psf, *dpsf;
1636        int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1637        int qrv = pmc->interface->mr_qrv;
1638        int new_in, rv;
1639
1640        rv = 0;
1641        for (psf=pmc->sources; psf; psf=psf->sf_next) {
1642                if (pmc->sfcount[MCAST_EXCLUDE]) {
1643                        new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1644                                !psf->sf_count[MCAST_INCLUDE];
1645                } else
1646                        new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1647                if (new_in) {
1648                        if (!psf->sf_oldin) {
1649                                struct ip_sf_list *prev = NULL;
1650
1651                                for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1652                                        if (dpsf->sf_inaddr == psf->sf_inaddr)
1653                                                break;
1654                                        prev = dpsf;
1655                                }
1656                                if (dpsf) {
1657                                        if (prev)
1658                                                prev->sf_next = dpsf->sf_next;
1659                                        else
1660                                                pmc->tomb = dpsf->sf_next;
1661                                        kfree(dpsf);
1662                                }
1663                                psf->sf_crcount = qrv;
1664                                rv++;
1665                        }
1666                } else if (psf->sf_oldin) {
1667
1668                        psf->sf_crcount = 0;
1669                        /*
1670                         * add or update "delete" records if an active filter
1671                         * is now inactive
1672                         */
1673                        for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1674                                if (dpsf->sf_inaddr == psf->sf_inaddr)
1675                                        break;
1676                        if (!dpsf) {
1677                                dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1678                                if (!dpsf)
1679                                        continue;
1680                                *dpsf = *psf;
1681                                /* pmc->lock held by callers */
1682                                dpsf->sf_next = pmc->tomb;
1683                                pmc->tomb = dpsf;
1684                        }
1685                        dpsf->sf_crcount = qrv;
1686                        rv++;
1687                }
1688        }
1689        return rv;
1690}
1691#endif
1692
1693/*
1694 * Add multicast source filter list to the interface list
1695 */
1696static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1697                         int sfcount, __be32 *psfsrc, int delta)
1698{
1699        struct ip_mc_list *pmc;
1700        int     isexclude;
1701        int     i, err;
1702
1703        if (!in_dev)
1704                return -ENODEV;
1705        rcu_read_lock();
1706        for_each_pmc_rcu(in_dev, pmc) {
1707                if (*pmca == pmc->multiaddr)
1708                        break;
1709        }
1710        if (!pmc) {
1711                /* MCA not found?? bug */
1712                rcu_read_unlock();
1713                return -ESRCH;
1714        }
1715        spin_lock_bh(&pmc->lock);
1716        rcu_read_unlock();
1717
1718#ifdef CONFIG_IP_MULTICAST
1719        sf_markstate(pmc);
1720#endif
1721        isexclude = pmc->sfmode == MCAST_EXCLUDE;
1722        if (!delta)
1723                pmc->sfcount[sfmode]++;
1724        err = 0;
1725        for (i=0; i<sfcount; i++) {
1726                err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1727                if (err)
1728                        break;
1729        }
1730        if (err) {
1731                int j;
1732
1733                if (!delta)
1734                        pmc->sfcount[sfmode]--;
1735                for (j=0; j<i; j++)
1736                        (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1737        } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1738#ifdef CONFIG_IP_MULTICAST
1739                struct ip_sf_list *psf;
1740                in_dev = pmc->interface;
1741#endif
1742
1743                /* filter mode change */
1744                if (pmc->sfcount[MCAST_EXCLUDE])
1745                        pmc->sfmode = MCAST_EXCLUDE;
1746                else if (pmc->sfcount[MCAST_INCLUDE])
1747                        pmc->sfmode = MCAST_INCLUDE;
1748#ifdef CONFIG_IP_MULTICAST
1749                /* else no filters; keep old mode for reports */
1750
1751                pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1752                        IGMP_Unsolicited_Report_Count;
1753                in_dev->mr_ifc_count = pmc->crcount;
1754                for (psf=pmc->sources; psf; psf = psf->sf_next)
1755                        psf->sf_crcount = 0;
1756                igmp_ifc_event(in_dev);
1757        } else if (sf_setstate(pmc)) {
1758                igmp_ifc_event(in_dev);
1759#endif
1760        }
1761        spin_unlock_bh(&pmc->lock);
1762        return err;
1763}
1764
1765static void ip_mc_clear_src(struct ip_mc_list *pmc)
1766{
1767        struct ip_sf_list *psf, *nextpsf;
1768
1769        for (psf=pmc->tomb; psf; psf=nextpsf) {
1770                nextpsf = psf->sf_next;
1771                kfree(psf);
1772        }
1773        pmc->tomb = NULL;
1774        for (psf=pmc->sources; psf; psf=nextpsf) {
1775                nextpsf = psf->sf_next;
1776                kfree(psf);
1777        }
1778        pmc->sources = NULL;
1779        pmc->sfmode = MCAST_EXCLUDE;
1780        pmc->sfcount[MCAST_INCLUDE] = 0;
1781        pmc->sfcount[MCAST_EXCLUDE] = 1;
1782}
1783
1784
1785/*
1786 * Join a multicast group
1787 */
1788int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1789{
1790        int err;
1791        __be32 addr = imr->imr_multiaddr.s_addr;
1792        struct ip_mc_socklist *iml = NULL, *i;
1793        struct in_device *in_dev;
1794        struct inet_sock *inet = inet_sk(sk);
1795        struct net *net = sock_net(sk);
1796        int ifindex;
1797        int count = 0;
1798
1799        if (!ipv4_is_multicast(addr))
1800                return -EINVAL;
1801
1802        rtnl_lock();
1803
1804        in_dev = ip_mc_find_dev(net, imr);
1805
1806        if (!in_dev) {
1807                iml = NULL;
1808                err = -ENODEV;
1809                goto done;
1810        }
1811
1812        err = -EADDRINUSE;
1813        ifindex = imr->imr_ifindex;
1814        for_each_pmc_rtnl(inet, i) {
1815                if (i->multi.imr_multiaddr.s_addr == addr &&
1816                    i->multi.imr_ifindex == ifindex)
1817                        goto done;
1818                count++;
1819        }
1820        err = -ENOBUFS;
1821        if (count >= sysctl_igmp_max_memberships)
1822                goto done;
1823        iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1824        if (iml == NULL)
1825                goto done;
1826
1827        memcpy(&iml->multi, imr, sizeof(*imr));
1828        iml->next_rcu = inet->mc_list;
1829        iml->sflist = NULL;
1830        iml->sfmode = MCAST_EXCLUDE;
1831        rcu_assign_pointer(inet->mc_list, iml);
1832        ip_mc_inc_group(in_dev, addr);
1833        err = 0;
1834done:
1835        rtnl_unlock();
1836        return err;
1837}
1838EXPORT_SYMBOL(ip_mc_join_group);
1839
1840static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1841                           struct in_device *in_dev)
1842{
1843        struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1844        int err;
1845
1846        if (psf == NULL) {
1847                /* any-source empty exclude case */
1848                return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1849                        iml->sfmode, 0, NULL, 0);
1850        }
1851        err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1852                        iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1853        RCU_INIT_POINTER(iml->sflist, NULL);
1854        /* decrease mem now to avoid the memleak warning */
1855        atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1856        kfree_rcu(psf, rcu);
1857        return err;
1858}
1859
1860/*
1861 *      Ask a socket to leave a group.
1862 */
1863
1864int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1865{
1866        struct inet_sock *inet = inet_sk(sk);
1867        struct ip_mc_socklist *iml;
1868        struct ip_mc_socklist __rcu **imlp;
1869        struct in_device *in_dev;
1870        struct net *net = sock_net(sk);
1871        __be32 group = imr->imr_multiaddr.s_addr;
1872        u32 ifindex;
1873        int ret = -EADDRNOTAVAIL;
1874
1875        rtnl_lock();
1876        in_dev = ip_mc_find_dev(net, imr);
1877        ifindex = imr->imr_ifindex;
1878        for (imlp = &inet->mc_list;
1879             (iml = rtnl_dereference(*imlp)) != NULL;
1880             imlp = &iml->next_rcu) {
1881                if (iml->multi.imr_multiaddr.s_addr != group)
1882                        continue;
1883                if (ifindex) {
1884                        if (iml->multi.imr_ifindex != ifindex)
1885                                continue;
1886                } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1887                                iml->multi.imr_address.s_addr)
1888                        continue;
1889
1890                (void) ip_mc_leave_src(sk, iml, in_dev);
1891
1892                *imlp = iml->next_rcu;
1893
1894                if (in_dev)
1895                        ip_mc_dec_group(in_dev, group);
1896                rtnl_unlock();
1897                /* decrease mem now to avoid the memleak warning */
1898                atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1899                kfree_rcu(iml, rcu);
1900                return 0;
1901        }
1902        if (!in_dev)
1903                ret = -ENODEV;
1904        rtnl_unlock();
1905        return ret;
1906}
1907EXPORT_SYMBOL(ip_mc_leave_group);
1908
1909int ip_mc_source(int add, int omode, struct sock *sk, struct
1910        ip_mreq_source *mreqs, int ifindex)
1911{
1912        int err;
1913        struct ip_mreqn imr;
1914        __be32 addr = mreqs->imr_multiaddr;
1915        struct ip_mc_socklist *pmc;
1916        struct in_device *in_dev = NULL;
1917        struct inet_sock *inet = inet_sk(sk);
1918        struct ip_sf_socklist *psl;
1919        struct net *net = sock_net(sk);
1920        int leavegroup = 0;
1921        int i, j, rv;
1922
1923        if (!ipv4_is_multicast(addr))
1924                return -EINVAL;
1925
1926        rtnl_lock();
1927
1928        imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1929        imr.imr_address.s_addr = mreqs->imr_interface;
1930        imr.imr_ifindex = ifindex;
1931        in_dev = ip_mc_find_dev(net, &imr);
1932
1933        if (!in_dev) {
1934                err = -ENODEV;
1935                goto done;
1936        }
1937        err = -EADDRNOTAVAIL;
1938
1939        for_each_pmc_rtnl(inet, pmc) {
1940                if ((pmc->multi.imr_multiaddr.s_addr ==
1941                     imr.imr_multiaddr.s_addr) &&
1942                    (pmc->multi.imr_ifindex == imr.imr_ifindex))
1943                        break;
1944        }
1945        if (!pmc) {             /* must have a prior join */
1946                err = -EINVAL;
1947                goto done;
1948        }
1949        /* if a source filter was set, must be the same mode as before */
1950        if (pmc->sflist) {
1951                if (pmc->sfmode != omode) {
1952                        err = -EINVAL;
1953                        goto done;
1954                }
1955        } else if (pmc->sfmode != omode) {
1956                /* allow mode switches for empty-set filters */
1957                ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1958                ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1959                        NULL, 0);
1960                pmc->sfmode = omode;
1961        }
1962
1963        psl = rtnl_dereference(pmc->sflist);
1964        if (!add) {
1965                if (!psl)
1966                        goto done;      /* err = -EADDRNOTAVAIL */
1967                rv = !0;
1968                for (i=0; i<psl->sl_count; i++) {
1969                        rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1970                                sizeof(__be32));
1971                        if (rv == 0)
1972                                break;
1973                }
1974                if (rv)         /* source not found */
1975                        goto done;      /* err = -EADDRNOTAVAIL */
1976
1977                /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1978                if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1979                        leavegroup = 1;
1980                        goto done;
1981                }
1982
1983                /* update the interface filter */
1984                ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1985                        &mreqs->imr_sourceaddr, 1);
1986
1987                for (j=i+1; j<psl->sl_count; j++)
1988                        psl->sl_addr[j-1] = psl->sl_addr[j];
1989                psl->sl_count--;
1990                err = 0;
1991                goto done;
1992        }
1993        /* else, add a new source to the filter */
1994
1995        if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1996                err = -ENOBUFS;
1997                goto done;
1998        }
1999        if (!psl || psl->sl_count == psl->sl_max) {
2000                struct ip_sf_socklist *newpsl;
2001                int count = IP_SFBLOCK;
2002
2003                if (psl)
2004                        count += psl->sl_max;
2005                newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2006                if (!newpsl) {
2007                        err = -ENOBUFS;
2008                        goto done;
2009                }
2010                newpsl->sl_max = count;
2011                newpsl->sl_count = count - IP_SFBLOCK;
2012                if (psl) {
2013                        for (i=0; i<psl->sl_count; i++)
2014                                newpsl->sl_addr[i] = psl->sl_addr[i];
2015                        /* decrease mem now to avoid the memleak warning */
2016                        atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2017                        kfree_rcu(psl, rcu);
2018                }
2019                rcu_assign_pointer(pmc->sflist, newpsl);
2020                psl = newpsl;
2021        }
2022        rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2023        for (i=0; i<psl->sl_count; i++) {
2024                rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2025                        sizeof(__be32));
2026                if (rv == 0)
2027                        break;
2028        }
2029        if (rv == 0)            /* address already there is an error */
2030                goto done;
2031        for (j=psl->sl_count-1; j>=i; j--)
2032                psl->sl_addr[j+1] = psl->sl_addr[j];
2033        psl->sl_addr[i] = mreqs->imr_sourceaddr;
2034        psl->sl_count++;
2035        err = 0;
2036        /* update the interface list */
2037        ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2038                &mreqs->imr_sourceaddr, 1);
2039done:
2040        rtnl_unlock();
2041        if (leavegroup)
2042                return ip_mc_leave_group(sk, &imr);
2043        return err;
2044}
2045
2046int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2047{
2048        int err = 0;
2049        struct ip_mreqn imr;
2050        __be32 addr = msf->imsf_multiaddr;
2051        struct ip_mc_socklist *pmc;
2052        struct in_device *in_dev;
2053        struct inet_sock *inet = inet_sk(sk);
2054        struct ip_sf_socklist *newpsl, *psl;
2055        struct net *net = sock_net(sk);
2056        int leavegroup = 0;
2057
2058        if (!ipv4_is_multicast(addr))
2059                return -EINVAL;
2060        if (msf->imsf_fmode != MCAST_INCLUDE &&
2061            msf->imsf_fmode != MCAST_EXCLUDE)
2062                return -EINVAL;
2063
2064        rtnl_lock();
2065
2066        imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2067        imr.imr_address.s_addr = msf->imsf_interface;
2068        imr.imr_ifindex = ifindex;
2069        in_dev = ip_mc_find_dev(net, &imr);
2070
2071        if (!in_dev) {
2072                err = -ENODEV;
2073                goto done;
2074        }
2075
2076        /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2077        if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2078                leavegroup = 1;
2079                goto done;
2080        }
2081
2082        for_each_pmc_rtnl(inet, pmc) {
2083                if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2084                    pmc->multi.imr_ifindex == imr.imr_ifindex)
2085                        break;
2086        }
2087        if (!pmc) {             /* must have a prior join */
2088                err = -EINVAL;
2089                goto done;
2090        }
2091        if (msf->imsf_numsrc) {
2092                newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2093                                                           GFP_KERNEL);
2094                if (!newpsl) {
2095                        err = -ENOBUFS;
2096                        goto done;
2097                }
2098                newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2099                memcpy(newpsl->sl_addr, msf->imsf_slist,
2100                        msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2101                err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2102                        msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2103                if (err) {
2104                        sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2105                        goto done;
2106                }
2107        } else {
2108                newpsl = NULL;
2109                (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2110                                     msf->imsf_fmode, 0, NULL, 0);
2111        }
2112        psl = rtnl_dereference(pmc->sflist);
2113        if (psl) {
2114                (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115                        psl->sl_count, psl->sl_addr, 0);
2116                /* decrease mem now to avoid the memleak warning */
2117                atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2118                kfree_rcu(psl, rcu);
2119        } else
2120                (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2121                        0, NULL, 0);
2122        rcu_assign_pointer(pmc->sflist, newpsl);
2123        pmc->sfmode = msf->imsf_fmode;
2124        err = 0;
2125done:
2126        rtnl_unlock();
2127        if (leavegroup)
2128                err = ip_mc_leave_group(sk, &imr);
2129        return err;
2130}
2131
2132int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2133        struct ip_msfilter __user *optval, int __user *optlen)
2134{
2135        int err, len, count, copycount;
2136        struct ip_mreqn imr;
2137        __be32 addr = msf->imsf_multiaddr;
2138        struct ip_mc_socklist *pmc;
2139        struct in_device *in_dev;
2140        struct inet_sock *inet = inet_sk(sk);
2141        struct ip_sf_socklist *psl;
2142        struct net *net = sock_net(sk);
2143
2144        if (!ipv4_is_multicast(addr))
2145                return -EINVAL;
2146
2147        rtnl_lock();
2148
2149        imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2150        imr.imr_address.s_addr = msf->imsf_interface;
2151        imr.imr_ifindex = 0;
2152        in_dev = ip_mc_find_dev(net, &imr);
2153
2154        if (!in_dev) {
2155                err = -ENODEV;
2156                goto done;
2157        }
2158        err = -EADDRNOTAVAIL;
2159
2160        for_each_pmc_rtnl(inet, pmc) {
2161                if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162                    pmc->multi.imr_ifindex == imr.imr_ifindex)
2163                        break;
2164        }
2165        if (!pmc)               /* must have a prior join */
2166                goto done;
2167        msf->imsf_fmode = pmc->sfmode;
2168        psl = rtnl_dereference(pmc->sflist);
2169        rtnl_unlock();
2170        if (!psl) {
2171                len = 0;
2172                count = 0;
2173        } else {
2174                count = psl->sl_count;
2175        }
2176        copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2177        len = copycount * sizeof(psl->sl_addr[0]);
2178        msf->imsf_numsrc = count;
2179        if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2180            copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2181                return -EFAULT;
2182        }
2183        if (len &&
2184            copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2185                return -EFAULT;
2186        return 0;
2187done:
2188        rtnl_unlock();
2189        return err;
2190}
2191
2192int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2193        struct group_filter __user *optval, int __user *optlen)
2194{
2195        int err, i, count, copycount;
2196        struct sockaddr_in *psin;
2197        __be32 addr;
2198        struct ip_mc_socklist *pmc;
2199        struct inet_sock *inet = inet_sk(sk);
2200        struct ip_sf_socklist *psl;
2201
2202        psin = (struct sockaddr_in *)&gsf->gf_group;
2203        if (psin->sin_family != AF_INET)
2204                return -EINVAL;
2205        addr = psin->sin_addr.s_addr;
2206        if (!ipv4_is_multicast(addr))
2207                return -EINVAL;
2208
2209        rtnl_lock();
2210
2211        err = -EADDRNOTAVAIL;
2212
2213        for_each_pmc_rtnl(inet, pmc) {
2214                if (pmc->multi.imr_multiaddr.s_addr == addr &&
2215                    pmc->multi.imr_ifindex == gsf->gf_interface)
2216                        break;
2217        }
2218        if (!pmc)               /* must have a prior join */
2219                goto done;
2220        gsf->gf_fmode = pmc->sfmode;
2221        psl = rtnl_dereference(pmc->sflist);
2222        rtnl_unlock();
2223        count = psl ? psl->sl_count : 0;
2224        copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2225        gsf->gf_numsrc = count;
2226        if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2227            copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2228                return -EFAULT;
2229        }
2230        for (i=0; i<copycount; i++) {
2231                struct sockaddr_storage ss;
2232
2233                psin = (struct sockaddr_in *)&ss;
2234                memset(&ss, 0, sizeof(ss));
2235                psin->sin_family = AF_INET;
2236                psin->sin_addr.s_addr = psl->sl_addr[i];
2237                if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2238                        return -EFAULT;
2239        }
2240        return 0;
2241done:
2242        rtnl_unlock();
2243        return err;
2244}
2245
2246/*
2247 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2248 */
2249int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2250{
2251        struct inet_sock *inet = inet_sk(sk);
2252        struct ip_mc_socklist *pmc;
2253        struct ip_sf_socklist *psl;
2254        int i;
2255        int ret;
2256
2257        ret = 1;
2258        if (!ipv4_is_multicast(loc_addr))
2259                goto out;
2260
2261        rcu_read_lock();
2262        for_each_pmc_rcu(inet, pmc) {
2263                if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2264                    pmc->multi.imr_ifindex == dif)
2265                        break;
2266        }
2267        ret = inet->mc_all;
2268        if (!pmc)
2269                goto unlock;
2270        psl = rcu_dereference(pmc->sflist);
2271        ret = (pmc->sfmode == MCAST_EXCLUDE);
2272        if (!psl)
2273                goto unlock;
2274
2275        for (i=0; i<psl->sl_count; i++) {
2276                if (psl->sl_addr[i] == rmt_addr)
2277                        break;
2278        }
2279        ret = 0;
2280        if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2281                goto unlock;
2282        if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2283                goto unlock;
2284        ret = 1;
2285unlock:
2286        rcu_read_unlock();
2287out:
2288        return ret;
2289}
2290
2291/*
2292 *      A socket is closing.
2293 */
2294
2295void ip_mc_drop_socket(struct sock *sk)
2296{
2297        struct inet_sock *inet = inet_sk(sk);
2298        struct ip_mc_socklist *iml;
2299        struct net *net = sock_net(sk);
2300
2301        if (inet->mc_list == NULL)
2302                return;
2303
2304        rtnl_lock();
2305        while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2306                struct in_device *in_dev;
2307
2308                inet->mc_list = iml->next_rcu;
2309                in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2310                (void) ip_mc_leave_src(sk, iml, in_dev);
2311                if (in_dev != NULL)
2312                        ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2313                /* decrease mem now to avoid the memleak warning */
2314                atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2315                kfree_rcu(iml, rcu);
2316        }
2317        rtnl_unlock();
2318}
2319
2320/* called with rcu_read_lock() */
2321int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2322{
2323        struct ip_mc_list *im;
2324        struct ip_sf_list *psf;
2325        int rv = 0;
2326
2327        for_each_pmc_rcu(in_dev, im) {
2328                if (im->multiaddr == mc_addr)
2329                        break;
2330        }
2331        if (im && proto == IPPROTO_IGMP) {
2332                rv = 1;
2333        } else if (im) {
2334                if (src_addr) {
2335                        for (psf=im->sources; psf; psf=psf->sf_next) {
2336                                if (psf->sf_inaddr == src_addr)
2337                                        break;
2338                        }
2339                        if (psf)
2340                                rv = psf->sf_count[MCAST_INCLUDE] ||
2341                                        psf->sf_count[MCAST_EXCLUDE] !=
2342                                        im->sfcount[MCAST_EXCLUDE];
2343                        else
2344                                rv = im->sfcount[MCAST_EXCLUDE] != 0;
2345                } else
2346                        rv = 1; /* unspecified source; tentatively allow */
2347        }
2348        return rv;
2349}
2350
2351#if defined(CONFIG_PROC_FS)
2352struct igmp_mc_iter_state {
2353        struct seq_net_private p;
2354        struct net_device *dev;
2355        struct in_device *in_dev;
2356};
2357
2358#define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2359
2360static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2361{
2362        struct net *net = seq_file_net(seq);
2363        struct ip_mc_list *im = NULL;
2364        struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2365
2366        state->in_dev = NULL;
2367        for_each_netdev_rcu(net, state->dev) {
2368                struct in_device *in_dev;
2369
2370                in_dev = __in_dev_get_rcu(state->dev);
2371                if (!in_dev)
2372                        continue;
2373                im = rcu_dereference(in_dev->mc_list);
2374                if (im) {
2375                        state->in_dev = in_dev;
2376                        break;
2377                }
2378        }
2379        return im;
2380}
2381
2382static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2383{
2384        struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2385
2386        im = rcu_dereference(im->next_rcu);
2387        while (!im) {
2388                state->dev = next_net_device_rcu(state->dev);
2389                if (!state->dev) {
2390                        state->in_dev = NULL;
2391                        break;
2392                }
2393                state->in_dev = __in_dev_get_rcu(state->dev);
2394                if (!state->in_dev)
2395                        continue;
2396                im = rcu_dereference(state->in_dev->mc_list);
2397        }
2398        return im;
2399}
2400
2401static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2402{
2403        struct ip_mc_list *im = igmp_mc_get_first(seq);
2404        if (im)
2405                while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2406                        --pos;
2407        return pos ? NULL : im;
2408}
2409
2410static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2411        __acquires(rcu)
2412{
2413        rcu_read_lock();
2414        return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2415}
2416
2417static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2418{
2419        struct ip_mc_list *im;
2420        if (v == SEQ_START_TOKEN)
2421                im = igmp_mc_get_first(seq);
2422        else
2423                im = igmp_mc_get_next(seq, v);
2424        ++*pos;
2425        return im;
2426}
2427
2428static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2429        __releases(rcu)
2430{
2431        struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2432
2433        state->in_dev = NULL;
2434        state->dev = NULL;
2435        rcu_read_unlock();
2436}
2437
2438static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2439{
2440        if (v == SEQ_START_TOKEN)
2441                seq_puts(seq,
2442                         "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2443        else {
2444                struct ip_mc_list *im = (struct ip_mc_list *)v;
2445                struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2446                char   *querier;
2447                long delta;
2448
2449#ifdef CONFIG_IP_MULTICAST
2450                querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2451                          IGMP_V2_SEEN(state->in_dev) ? "V2" :
2452                          "V3";
2453#else
2454                querier = "NONE";
2455#endif
2456
2457                if (rcu_dereference(state->in_dev->mc_list) == im) {
2458                        seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2459                                   state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2460                }
2461
2462                delta = im->timer.expires - jiffies;
2463                seq_printf(seq,
2464                           "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2465                           im->multiaddr, im->users,
2466                           im->tm_running,
2467                           im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2468                           im->reporter);
2469        }
2470        return 0;
2471}
2472
2473static const struct seq_operations igmp_mc_seq_ops = {
2474        .start  =       igmp_mc_seq_start,
2475        .next   =       igmp_mc_seq_next,
2476        .stop   =       igmp_mc_seq_stop,
2477        .show   =       igmp_mc_seq_show,
2478};
2479
2480static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2481{
2482        return seq_open_net(inode, file, &igmp_mc_seq_ops,
2483                        sizeof(struct igmp_mc_iter_state));
2484}
2485
2486static const struct file_operations igmp_mc_seq_fops = {
2487        .owner          =       THIS_MODULE,
2488        .open           =       igmp_mc_seq_open,
2489        .read           =       seq_read,
2490        .llseek         =       seq_lseek,
2491        .release        =       seq_release_net,
2492};
2493
2494struct igmp_mcf_iter_state {
2495        struct seq_net_private p;
2496        struct net_device *dev;
2497        struct in_device *idev;
2498        struct ip_mc_list *im;
2499};
2500
2501#define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2502
2503static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2504{
2505        struct net *net = seq_file_net(seq);
2506        struct ip_sf_list *psf = NULL;
2507        struct ip_mc_list *im = NULL;
2508        struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2509
2510        state->idev = NULL;
2511        state->im = NULL;
2512        for_each_netdev_rcu(net, state->dev) {
2513                struct in_device *idev;
2514                idev = __in_dev_get_rcu(state->dev);
2515                if (unlikely(idev == NULL))
2516                        continue;
2517                im = rcu_dereference(idev->mc_list);
2518                if (likely(im != NULL)) {
2519                        spin_lock_bh(&im->lock);
2520                        psf = im->sources;
2521                        if (likely(psf != NULL)) {
2522                                state->im = im;
2523                                state->idev = idev;
2524                                break;
2525                        }
2526                        spin_unlock_bh(&im->lock);
2527                }
2528        }
2529        return psf;
2530}
2531
2532static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2533{
2534        struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2535
2536        psf = psf->sf_next;
2537        while (!psf) {
2538                spin_unlock_bh(&state->im->lock);
2539                state->im = state->im->next;
2540                while (!state->im) {
2541                        state->dev = next_net_device_rcu(state->dev);
2542                        if (!state->dev) {
2543                                state->idev = NULL;
2544                                goto out;
2545                        }
2546                        state->idev = __in_dev_get_rcu(state->dev);
2547                        if (!state->idev)
2548                                continue;
2549                        state->im = rcu_dereference(state->idev->mc_list);
2550                }
2551                if (!state->im)
2552                        break;
2553                spin_lock_bh(&state->im->lock);
2554                psf = state->im->sources;
2555        }
2556out:
2557        return psf;
2558}
2559
2560static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2561{
2562        struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2563        if (psf)
2564                while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2565                        --pos;
2566        return pos ? NULL : psf;
2567}
2568
2569static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2570        __acquires(rcu)
2571{
2572        rcu_read_lock();
2573        return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2574}
2575
2576static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2577{
2578        struct ip_sf_list *psf;
2579        if (v == SEQ_START_TOKEN)
2580                psf = igmp_mcf_get_first(seq);
2581        else
2582                psf = igmp_mcf_get_next(seq, v);
2583        ++*pos;
2584        return psf;
2585}
2586
2587static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2588        __releases(rcu)
2589{
2590        struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2591        if (likely(state->im != NULL)) {
2592                spin_unlock_bh(&state->im->lock);
2593                state->im = NULL;
2594        }
2595        state->idev = NULL;
2596        state->dev = NULL;
2597        rcu_read_unlock();
2598}
2599
2600static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2601{
2602        struct ip_sf_list *psf = (struct ip_sf_list *)v;
2603        struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2604
2605        if (v == SEQ_START_TOKEN) {
2606                seq_printf(seq,
2607                           "%3s %6s "
2608                           "%10s %10s %6s %6s\n", "Idx",
2609                           "Device", "MCA",
2610                           "SRC", "INC", "EXC");
2611        } else {
2612                seq_printf(seq,
2613                           "%3d %6.6s 0x%08x "
2614                           "0x%08x %6lu %6lu\n",
2615                           state->dev->ifindex, state->dev->name,
2616                           ntohl(state->im->multiaddr),
2617                           ntohl(psf->sf_inaddr),
2618                           psf->sf_count[MCAST_INCLUDE],
2619                           psf->sf_count[MCAST_EXCLUDE]);
2620        }
2621        return 0;
2622}
2623
2624static const struct seq_operations igmp_mcf_seq_ops = {
2625        .start  =       igmp_mcf_seq_start,
2626        .next   =       igmp_mcf_seq_next,
2627        .stop   =       igmp_mcf_seq_stop,
2628        .show   =       igmp_mcf_seq_show,
2629};
2630
2631static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2632{
2633        return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2634                        sizeof(struct igmp_mcf_iter_state));
2635}
2636
2637static const struct file_operations igmp_mcf_seq_fops = {
2638        .owner          =       THIS_MODULE,
2639        .open           =       igmp_mcf_seq_open,
2640        .read           =       seq_read,
2641        .llseek         =       seq_lseek,
2642        .release        =       seq_release_net,
2643};
2644
2645static int __net_init igmp_net_init(struct net *net)
2646{
2647        struct proc_dir_entry *pde;
2648
2649        pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2650        if (!pde)
2651                goto out_igmp;
2652        pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2653        if (!pde)
2654                goto out_mcfilter;
2655        return 0;
2656
2657out_mcfilter:
2658        proc_net_remove(net, "igmp");
2659out_igmp:
2660        return -ENOMEM;
2661}
2662
2663static void __net_exit igmp_net_exit(struct net *net)
2664{
2665        proc_net_remove(net, "mcfilter");
2666        proc_net_remove(net, "igmp");
2667}
2668
2669static struct pernet_operations igmp_net_ops = {
2670        .init = igmp_net_init,
2671        .exit = igmp_net_exit,
2672};
2673
2674int __init igmp_mc_proc_init(void)
2675{
2676        return register_pernet_subsys(&igmp_net_ops);
2677}
2678#endif
2679
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