net/ipv4/ipmr.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IP multicast routing support for mrouted 3.6/3.8
   4  *
   5  *              (c) 1995 Alan Cox, <[email protected]>
   6  *        Linux Consultancy and Custom Driver Development
   7  *
   8  *      Fixes:
   9  *      Michael Chastain        :       Incorrect size of copying.
  10  *      Alan Cox                :       Added the cache manager code
  11  *      Alan Cox                :       Fixed the clone/copy bug and device race.
  12  *      Mike McLagan            :       Routing by source
  13  *      Malcolm Beattie         :       Buffer handling fixes.
  14  *      Alexey Kuznetsov        :       Double buffer free and other fixes.
  15  *      SVR Anand               :       Fixed several multicast bugs and problems.
  16  *      Alexey Kuznetsov        :       Status, optimisations and more.
  17  *      Brad Parker             :       Better behaviour on mrouted upcall
  18  *                                      overflow.
  19  *      Carlos Picoto           :       PIMv1 Support
  20  *      Pavlin Ivanov Radoslavov:       PIMv2 Registers must checksum only PIM header
  21  *                                      Relax this requirement to work with older peers.
  22  */
  23
  24 #include <linux/uaccess.h>
  25 #include <linux/types.h>
  26 #include <linux/cache.h>
  27 #include <linux/capability.h>
  28 #include <linux/errno.h>
  29 #include <linux/mm.h>
  30 #include <linux/kernel.h>
  31 #include <linux/fcntl.h>
  32 #include <linux/stat.h>
  33 #include <linux/socket.h>
  34 #include <linux/in.h>
  35 #include <linux/inet.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/inetdevice.h>
  38 #include <linux/igmp.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/mroute.h>
  42 #include <linux/init.h>
  43 #include <linux/if_ether.h>
  44 #include <linux/slab.h>
  45 #include <net/net_namespace.h>
  46 #include <net/ip.h>
  47 #include <net/protocol.h>
  48 #include <linux/skbuff.h>
  49 #include <net/route.h>
  50 #include <net/icmp.h>
  51 #include <net/udp.h>
  52 #include <net/raw.h>
  53 #include <linux/notifier.h>
  54 #include <linux/if_arp.h>
  55 #include <linux/netfilter_ipv4.h>
  56 #include <linux/compat.h>
  57 #include <linux/export.h>
  58 #include <linux/rhashtable.h>
  59 #include <net/ip_tunnels.h>
  60 #include <net/checksum.h>
  61 #include <net/netlink.h>
  62 #include <net/fib_rules.h>
  63 #include <linux/netconf.h>
  64 #include <net/rtnh.h>
  65
  66 #include <linux/nospec.h>
  67
  68 struct ipmr_rule {
  69         struct fib_rule         common;
  70 };
  71
  72 struct ipmr_result {
  73         struct mr_table         *mrt;
  74 };
  75
  76 /* Big lock, protecting vif table, mrt cache and mroute socket state.
  77  * Note that the changes are semaphored via rtnl_lock.
  78  */
  79
  80 static DEFINE_RWLOCK(mrt_lock);
  81
  82 /* Multicast router control variables */
  83
  84 /* Special spinlock for queue of unresolved entries */
  85 static DEFINE_SPINLOCK(mfc_unres_lock);
  86
  87 /* We return to original Alan's scheme. Hash table of resolved
  88  * entries is changed only in process context and protected
  89  * with weak lock mrt_lock. Queue of unresolved entries is protected
  90  * with strong spinlock mfc_unres_lock.
  91  *
  92  * In this case data path is free of exclusive locks at all.
  93  */
  94
  95 static struct kmem_cache *mrt_cachep __ro_after_init;
  96
  97 static struct mr_table *ipmr_new_table(struct net *net, u32 id);
  98 static void ipmr_free_table(struct mr_table *mrt);
  99
 100 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
 101                           struct net_device *dev, struct sk_buff *skb,
 102                           struct mfc_cache *cache, int local);
 103 static int ipmr_cache_report(struct mr_table *mrt,
 104                              struct sk_buff *pkt, vifi_t vifi, int assert);
 105 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
 106                                  int cmd);
 107 static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
 108 static void mroute_clean_tables(struct mr_table *mrt, int flags);
 109 static void ipmr_expire_process(struct timer_list *t);
 110
 111 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
 112 #define ipmr_for_each_table(mrt, net) \
 113         list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
 114
 115 static struct mr_table *ipmr_mr_table_iter(struct net *net,
 116                                            struct mr_table *mrt)
 117 {
 118         struct mr_table *ret;
 119
 120         if (!mrt)
 121                 ret = list_entry_rcu(net->ipv4.mr_tables.next,
 122                                      struct mr_table, list);
 123         else
 124                 ret = list_entry_rcu(mrt->list.next,
 125                                      struct mr_table, list);
 126
 127         if (&ret->list == &net->ipv4.mr_tables)
 128                 return NULL;
 129         return ret;
 130 }
 131
 132 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
 133 {
 134         struct mr_table *mrt;
 135
 136         ipmr_for_each_table(mrt, net) {
 137                 if (mrt->id == id)
 138                         return mrt;
 139         }
 140         return NULL;
 141 }
 142
 143 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
 144                            struct mr_table **mrt)
 145 {
 146         int err;
 147         struct ipmr_result res;
 148         struct fib_lookup_arg arg = {
 149                 .result = &res,
 150                 .flags = FIB_LOOKUP_NOREF,
 151         };
 152
 153         /* update flow if oif or iif point to device enslaved to l3mdev */
 154         l3mdev_update_flow(net, flowi4_to_flowi(flp4));
 155
 156         err = fib_rules_lookup(net->ipv4.mr_rules_ops,
 157                                flowi4_to_flowi(flp4), 0, &arg);
 158         if (err < 0)
 159                 return err;
 160         *mrt = res.mrt;
 161         return 0;
 162 }
 163
 164 static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
 165                             int flags, struct fib_lookup_arg *arg)
 166 {
 167         struct ipmr_result *res = arg->result;
 168         struct mr_table *mrt;
 169
 170         switch (rule->action) {
 171         case FR_ACT_TO_TBL:
 172                 break;
 173         case FR_ACT_UNREACHABLE:
 174                 return -ENETUNREACH;
 175         case FR_ACT_PROHIBIT:
 176                 return -EACCES;
 177         case FR_ACT_BLACKHOLE:
 178         default:
 179                 return -EINVAL;
 180         }
 181
 182         arg->table = fib_rule_get_table(rule, arg);
 183
 184         mrt = ipmr_get_table(rule->fr_net, arg->table);
 185         if (!mrt)
 186                 return -EAGAIN;
 187         res->mrt = mrt;
 188         return 0;
 189 }
 190
 191 static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
 192 {
 193         return 1;
 194 }
 195
 196 static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
 197         FRA_GENERIC_POLICY,
 198 };
 199
 200 static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 201                                struct fib_rule_hdr *frh, struct nlattr **tb,
 202                                struct netlink_ext_ack *extack)
 203 {
 204         return 0;
 205 }
 206
 207 static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
 208                              struct nlattr **tb)
 209 {
 210         return 1;
 211 }
 212
 213 static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
 214                           struct fib_rule_hdr *frh)
 215 {
 216         frh->dst_len = 0;
 217         frh->src_len = 0;
 218         frh->tos     = 0;
 219         return 0;
 220 }
 221
 222 static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
 223         .family         = RTNL_FAMILY_IPMR,
 224         .rule_size      = sizeof(struct ipmr_rule),
 225         .addr_size      = sizeof(u32),
 226         .action         = ipmr_rule_action,
 227         .match          = ipmr_rule_match,
 228         .configure      = ipmr_rule_configure,
 229         .compare        = ipmr_rule_compare,
 230         .fill           = ipmr_rule_fill,
 231         .nlgroup        = RTNLGRP_IPV4_RULE,
 232         .policy         = ipmr_rule_policy,
 233         .owner          = THIS_MODULE,
 234 };
 235
 236 static int __net_init ipmr_rules_init(struct net *net)
 237 {
 238         struct fib_rules_ops *ops;
 239         struct mr_table *mrt;
 240         int err;
 241
 242         ops = fib_rules_register(&ipmr_rules_ops_template, net);
 243         if (IS_ERR(ops))
 244                 return PTR_ERR(ops);
 245
 246         INIT_LIST_HEAD(&net->ipv4.mr_tables);
 247
 248         mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
 249         if (IS_ERR(mrt)) {
 250                 err = PTR_ERR(mrt);
 251                 goto err1;
 252         }
 253
 254         err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
 255         if (err < 0)
 256                 goto err2;
 257
 258         net->ipv4.mr_rules_ops = ops;
 259         return 0;
 260
 261 err2:
 262         ipmr_free_table(mrt);
 263 err1:
 264         fib_rules_unregister(ops);
 265         return err;
 266 }
 267
 268 static void __net_exit ipmr_rules_exit(struct net *net)
 269 {
 270         struct mr_table *mrt, *next;
 271
 272         rtnl_lock();
 273         list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
 274                 list_del(&mrt->list);
 275                 ipmr_free_table(mrt);
 276         }
 277         fib_rules_unregister(net->ipv4.mr_rules_ops);
 278         rtnl_unlock();
 279 }
 280
 281 static int ipmr_rules_dump(struct net *net, struct notifier_block *nb)
 282 {
 283         return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR);
 284 }
 285
 286 static unsigned int ipmr_rules_seq_read(struct net *net)
 287 {
 288         return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);
 289 }
 290
 291 bool ipmr_rule_default(const struct fib_rule *rule)
 292 {
 293         return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
 294 }
 295 EXPORT_SYMBOL(ipmr_rule_default);
 296 #else
 297 #define ipmr_for_each_table(mrt, net) \
 298         for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
 299
 300 static struct mr_table *ipmr_mr_table_iter(struct net *net,
 301                                            struct mr_table *mrt)
 302 {
 303         if (!mrt)
 304                 return net->ipv4.mrt;
 305         return NULL;
 306 }
 307
 308 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
 309 {
 310         return net->ipv4.mrt;
 311 }
 312
 313 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
 314                            struct mr_table **mrt)
 315 {
 316         *mrt = net->ipv4.mrt;
 317         return 0;
 318 }
 319
 320 static int __net_init ipmr_rules_init(struct net *net)
 321 {
 322         struct mr_table *mrt;
 323
 324         mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
 325         if (IS_ERR(mrt))
 326                 return PTR_ERR(mrt);
 327         net->ipv4.mrt = mrt;
 328         return 0;
 329 }
 330
 331 static void __net_exit ipmr_rules_exit(struct net *net)
 332 {
 333         rtnl_lock();
 334         ipmr_free_table(net->ipv4.mrt);
 335         net->ipv4.mrt = NULL;
 336         rtnl_unlock();
 337 }
 338
 339 static int ipmr_rules_dump(struct net *net, struct notifier_block *nb)
 340 {
 341         return 0;
 342 }
 343
 344 static unsigned int ipmr_rules_seq_read(struct net *net)
 345 {
 346         return 0;
 347 }
 348
 349 bool ipmr_rule_default(const struct fib_rule *rule)
 350 {
 351         return true;
 352 }
 353 EXPORT_SYMBOL(ipmr_rule_default);
 354 #endif
 355
 356 static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
 357                                 const void *ptr)
 358 {
 359         const struct mfc_cache_cmp_arg *cmparg = arg->key;
 360         struct mfc_cache *c = (struct mfc_cache *)ptr;
 361
 362         return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
 363                cmparg->mfc_origin != c->mfc_origin;
 364 }
 365
 366 static const struct rhashtable_params ipmr_rht_params = {
 367         .head_offset = offsetof(struct mr_mfc, mnode),
 368         .key_offset = offsetof(struct mfc_cache, cmparg),
 369         .key_len = sizeof(struct mfc_cache_cmp_arg),
 370         .nelem_hint = 3,
 371         .obj_cmpfn = ipmr_hash_cmp,
 372         .automatic_shrinking = true,
 373 };
 374
 375 static void ipmr_new_table_set(struct mr_table *mrt,
 376                                struct net *net)
 377 {
 378 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
 379         list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
 380 #endif
 381 }
 382
 383 static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = {
 384         .mfc_mcastgrp = htonl(INADDR_ANY),
 385         .mfc_origin = htonl(INADDR_ANY),
 386 };
 387
 388 static struct mr_table_ops ipmr_mr_table_ops = {
 389         .rht_params = &ipmr_rht_params,
 390         .cmparg_any = &ipmr_mr_table_ops_cmparg_any,
 391 };
 392
 393 static struct mr_table *ipmr_new_table(struct net *net, u32 id)
 394 {
 395         struct mr_table *mrt;
 396
 397         /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
 398         if (id != RT_TABLE_DEFAULT && id >= 1000000000)
 399                 return ERR_PTR(-EINVAL);
 400
 401         mrt = ipmr_get_table(net, id);
 402         if (mrt)
 403                 return mrt;
 404
 405         return mr_table_alloc(net, id, &ipmr_mr_table_ops,
 406                               ipmr_expire_process, ipmr_new_table_set);
 407 }
 408
 409 static void ipmr_free_table(struct mr_table *mrt)
 410 {
 411         del_timer_sync(&mrt->ipmr_expire_timer);
 412         mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
 413                                  MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC);
 414         rhltable_destroy(&mrt->mfc_hash);
 415         kfree(mrt);
 416 }
 417
 418 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
 419
 420 static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
 421 {
 422         struct net *net = dev_net(dev);
 423
 424         dev_close(dev);
 425
 426         dev = __dev_get_by_name(net, "tunl0");
 427         if (dev) {
 428                 const struct net_device_ops *ops = dev->netdev_ops;
 429                 struct ifreq ifr;
 430                 struct ip_tunnel_parm p;
 431
 432                 memset(&p, 0, sizeof(p));
 433                 p.iph.daddr = v->vifc_rmt_addr.s_addr;
 434                 p.iph.saddr = v->vifc_lcl_addr.s_addr;
 435                 p.iph.version = 4;
 436                 p.iph.ihl = 5;
 437                 p.iph.protocol = IPPROTO_IPIP;
 438                 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
 439                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
 440
 441                 if (ops->ndo_do_ioctl) {
 442                         mm_segment_t oldfs = get_fs();
 443
 444                         set_fs(KERNEL_DS);
 445                         ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
 446                         set_fs(oldfs);
 447                 }
 448         }
 449 }
 450
 451 /* Initialize ipmr pimreg/tunnel in_device */
 452 static bool ipmr_init_vif_indev(const struct net_device *dev)
 453 {
 454         struct in_device *in_dev;
 455
 456         ASSERT_RTNL();
 457
 458         in_dev = __in_dev_get_rtnl(dev);
 459         if (!in_dev)
 460                 return false;
 461         ipv4_devconf_setall(in_dev);
 462         neigh_parms_data_state_setall(in_dev->arp_parms);
 463         IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
 464
 465         return true;
 466 }
 467
 468 static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
 469 {
 470         struct net_device  *dev;
 471
 472         dev = __dev_get_by_name(net, "tunl0");
 473
 474         if (dev) {
 475                 const struct net_device_ops *ops = dev->netdev_ops;
 476                 int err;
 477                 struct ifreq ifr;
 478                 struct ip_tunnel_parm p;
 479
 480                 memset(&p, 0, sizeof(p));
 481                 p.iph.daddr = v->vifc_rmt_addr.s_addr;
 482                 p.iph.saddr = v->vifc_lcl_addr.s_addr;
 483                 p.iph.version = 4;
 484                 p.iph.ihl = 5;
 485                 p.iph.protocol = IPPROTO_IPIP;
 486                 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
 487                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
 488
 489                 if (ops->ndo_do_ioctl) {
 490                         mm_segment_t oldfs = get_fs();
 491
 492                         set_fs(KERNEL_DS);
 493                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
 494                         set_fs(oldfs);
 495                 } else {
 496                         err = -EOPNOTSUPP;
 497                 }
 498                 dev = NULL;
 499
 500                 if (err == 0 &&
 501                     (dev = __dev_get_by_name(net, p.name)) != NULL) {
 502                         dev->flags |= IFF_MULTICAST;
 503                         if (!ipmr_init_vif_indev(dev))
 504                                 goto failure;
 505                         if (dev_open(dev, NULL))
 506                                 goto failure;
 507                         dev_hold(dev);
 508                 }
 509         }
 510         return dev;
 511
 512 failure:
 513         unregister_netdevice(dev);
 514         return NULL;
 515 }
 516
 517 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
 518 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
 519 {
 520         struct net *net = dev_net(dev);
 521         struct mr_table *mrt;
 522         struct flowi4 fl4 = {
 523                 .flowi4_oif     = dev->ifindex,
 524                 .flowi4_iif     = skb->skb_iif ? : LOOPBACK_IFINDEX,
 525                 .flowi4_mark    = skb->mark,
 526         };
 527         int err;
 528
 529         err = ipmr_fib_lookup(net, &fl4, &mrt);
 530         if (err < 0) {
 531                 kfree_skb(skb);
 532                 return err;
 533         }
 534
 535         read_lock(&mrt_lock);
 536         dev->stats.tx_bytes += skb->len;
 537         dev->stats.tx_packets++;
 538         ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
 539         read_unlock(&mrt_lock);
 540         kfree_skb(skb);
 541         return NETDEV_TX_OK;
 542 }
 543
 544 static int reg_vif_get_iflink(const struct net_device *dev)
 545 {
 546         return 0;
 547 }
 548
 549 static const struct net_device_ops reg_vif_netdev_ops = {
 550         .ndo_start_xmit = reg_vif_xmit,
 551         .ndo_get_iflink = reg_vif_get_iflink,
 552 };
 553
 554 static void reg_vif_setup(struct net_device *dev)
 555 {
 556         dev->type               = ARPHRD_PIMREG;
 557         dev->mtu                = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
 558         dev->flags              = IFF_NOARP;
 559         dev->netdev_ops         = &reg_vif_netdev_ops;
 560         dev->needs_free_netdev  = true;
 561         dev->features           |= NETIF_F_NETNS_LOCAL;
 562 }
 563
 564 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
 565 {
 566         struct net_device *dev;
 567         char name[IFNAMSIZ];
 568
 569         if (mrt->id == RT_TABLE_DEFAULT)
 570                 sprintf(name, "pimreg");
 571         else
 572                 sprintf(name, "pimreg%u", mrt->id);
 573
 574         dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
 575
 576         if (!dev)
 577                 return NULL;
 578
 579         dev_net_set(dev, net);
 580
 581         if (register_netdevice(dev)) {
 582                 free_netdev(dev);
 583                 return NULL;
 584         }
 585
 586         if (!ipmr_init_vif_indev(dev))
 587                 goto failure;
 588         if (dev_open(dev, NULL))
 589                 goto failure;
 590
 591         dev_hold(dev);
 592
 593         return dev;
 594
 595 failure:
 596         unregister_netdevice(dev);
 597         return NULL;
 598 }
 599
 600 /* called with rcu_read_lock() */
 601 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
 602                      unsigned int pimlen)
 603 {
 604         struct net_device *reg_dev = NULL;
 605         struct iphdr *encap;
 606
 607         encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
 608         /* Check that:
 609          * a. packet is really sent to a multicast group
 610          * b. packet is not a NULL-REGISTER
 611          * c. packet is not truncated
 612          */
 613         if (!ipv4_is_multicast(encap->daddr) ||
 614             encap->tot_len == 0 ||
 615             ntohs(encap->tot_len) + pimlen > skb->len)
 616                 return 1;
 617
 618         read_lock(&mrt_lock);
 619         if (mrt->mroute_reg_vif_num >= 0)
 620                 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
 621         read_unlock(&mrt_lock);
 622
 623         if (!reg_dev)
 624                 return 1;
 625
 626         skb->mac_header = skb->network_header;
 627         skb_pull(skb, (u8 *)encap - skb->data);
 628         skb_reset_network_header(skb);
 629         skb->protocol = htons(ETH_P_IP);
 630         skb->ip_summed = CHECKSUM_NONE;
 631
 632         skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
 633
 634         netif_rx(skb);
 635
 636         return NET_RX_SUCCESS;
 637 }
 638 #else
 639 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
 640 {
 641         return NULL;
 642 }
 643 #endif
 644
 645 static int call_ipmr_vif_entry_notifiers(struct net *net,
 646                                          enum fib_event_type event_type,
 647                                          struct vif_device *vif,
 648                                          vifi_t vif_index, u32 tb_id)
 649 {
 650         return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type,
 651                                      vif, vif_index, tb_id,
 652                                      &net->ipv4.ipmr_seq);
 653 }
 654
 655 static int call_ipmr_mfc_entry_notifiers(struct net *net,
 656                                          enum fib_event_type event_type,
 657                                          struct mfc_cache *mfc, u32 tb_id)
 658 {
 659         return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type,
 660                                      &mfc->_c, tb_id, &net->ipv4.ipmr_seq);
 661 }
 662
 663 /**
 664  *      vif_delete - Delete a VIF entry
 665  *      @notify: Set to 1, if the caller is a notifier_call
 666  */
 667 static int vif_delete(struct mr_table *mrt, int vifi, int notify,
 668                       struct list_head *head)
 669 {
 670         struct net *net = read_pnet(&mrt->net);
 671         struct vif_device *v;
 672         struct net_device *dev;
 673         struct in_device *in_dev;
 674
 675         if (vifi < 0 || vifi >= mrt->maxvif)
 676                 return -EADDRNOTAVAIL;
 677
 678         v = &mrt->vif_table[vifi];
 679
 680         if (VIF_EXISTS(mrt, vifi))
 681                 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, vifi,
 682                                               mrt->id);
 683
 684         write_lock_bh(&mrt_lock);
 685         dev = v->dev;
 686         v->dev = NULL;
 687
 688         if (!dev) {
 689                 write_unlock_bh(&mrt_lock);
 690                 return -EADDRNOTAVAIL;
 691         }
 692
 693         if (vifi == mrt->mroute_reg_vif_num)
 694                 mrt->mroute_reg_vif_num = -1;
 695
 696         if (vifi + 1 == mrt->maxvif) {
 697                 int tmp;
 698
 699                 for (tmp = vifi - 1; tmp >= 0; tmp--) {
 700                         if (VIF_EXISTS(mrt, tmp))
 701                                 break;
 702                 }
 703                 mrt->maxvif = tmp+1;
 704         }
 705
 706         write_unlock_bh(&mrt_lock);
 707
 708         dev_set_allmulti(dev, -1);
 709
 710         in_dev = __in_dev_get_rtnl(dev);
 711         if (in_dev) {
 712                 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
 713                 inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 714                                             NETCONFA_MC_FORWARDING,
 715                                             dev->ifindex, &in_dev->cnf);
 716                 ip_rt_multicast_event(in_dev);
 717         }
 718
 719         if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
 720                 unregister_netdevice_queue(dev, head);
 721
 722         dev_put(dev);
 723         return 0;
 724 }
 725
 726 static void ipmr_cache_free_rcu(struct rcu_head *head)
 727 {
 728         struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
 729
 730         kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
 731 }
 732
 733 static void ipmr_cache_free(struct mfc_cache *c)
 734 {
 735         call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
 736 }
 737
 738 /* Destroy an unresolved cache entry, killing queued skbs
 739  * and reporting error to netlink readers.
 740  */
 741 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
 742 {
 743         struct net *net = read_pnet(&mrt->net);
 744         struct sk_buff *skb;
 745         struct nlmsgerr *e;
 746
 747         atomic_dec(&mrt->cache_resolve_queue_len);
 748
 749         while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) {
 750                 if (ip_hdr(skb)->version == 0) {
 751                         struct nlmsghdr *nlh = skb_pull(skb,
 752                                                         sizeof(struct iphdr));
 753                         nlh->nlmsg_type = NLMSG_ERROR;
 754                         nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
 755                         skb_trim(skb, nlh->nlmsg_len);
 756                         e = nlmsg_data(nlh);
 757                         e->error = -ETIMEDOUT;
 758                         memset(&e->msg, 0, sizeof(e->msg));
 759
 760                         rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
 761                 } else {
 762                         kfree_skb(skb);
 763                 }
 764         }
 765
 766         ipmr_cache_free(c);
 767 }
 768
 769 /* Timer process for the unresolved queue. */
 770 static void ipmr_expire_process(struct timer_list *t)
 771 {
 772         struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
 773         struct mr_mfc *c, *next;
 774         unsigned long expires;
 775         unsigned long now;
 776
 777         if (!spin_trylock(&mfc_unres_lock)) {
 778                 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
 779                 return;
 780         }
 781
 782         if (list_empty(&mrt->mfc_unres_queue))
 783                 goto out;
 784
 785         now = jiffies;
 786         expires = 10*HZ;
 787
 788         list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
 789                 if (time_after(c->mfc_un.unres.expires, now)) {
 790                         unsigned long interval = c->mfc_un.unres.expires - now;
 791                         if (interval < expires)
 792                                 expires = interval;
 793                         continue;
 794                 }
 795
 796                 list_del(&c->list);
 797                 mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE);
 798                 ipmr_destroy_unres(mrt, (struct mfc_cache *)c);
 799         }
 800
 801         if (!list_empty(&mrt->mfc_unres_queue))
 802                 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
 803
 804 out:
 805         spin_unlock(&mfc_unres_lock);
 806 }
 807
 808 /* Fill oifs list. It is called under write locked mrt_lock. */
 809 static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache,
 810                                    unsigned char *ttls)
 811 {
 812         int vifi;
 813
 814         cache->mfc_un.res.minvif = MAXVIFS;
 815         cache->mfc_un.res.maxvif = 0;
 816         memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
 817
 818         for (vifi = 0; vifi < mrt->maxvif; vifi++) {
 819                 if (VIF_EXISTS(mrt, vifi) &&
 820                     ttls[vifi] && ttls[vifi] < 255) {
 821                         cache->mfc_un.res.ttls[vifi] = ttls[vifi];
 822                         if (cache->mfc_un.res.minvif > vifi)
 823                                 cache->mfc_un.res.minvif = vifi;
 824                         if (cache->mfc_un.res.maxvif <= vifi)
 825                                 cache->mfc_un.res.maxvif = vifi + 1;
 826                 }
 827         }
 828         cache->mfc_un.res.lastuse = jiffies;
 829 }
 830
 831 static int vif_add(struct net *net, struct mr_table *mrt,
 832                    struct vifctl *vifc, int mrtsock)
 833 {
 834         struct netdev_phys_item_id ppid = { };
 835         int vifi = vifc->vifc_vifi;
 836         struct vif_device *v = &mrt->vif_table[vifi];
 837         struct net_device *dev;
 838         struct in_device *in_dev;
 839         int err;
 840
 841         /* Is vif busy ? */
 842         if (VIF_EXISTS(mrt, vifi))
 843                 return -EADDRINUSE;
 844
 845         switch (vifc->vifc_flags) {
 846         case VIFF_REGISTER:
 847                 if (!ipmr_pimsm_enabled())
 848                         return -EINVAL;
 849                 /* Special Purpose VIF in PIM
 850                  * All the packets will be sent to the daemon
 851                  */
 852                 if (mrt->mroute_reg_vif_num >= 0)
 853                         return -EADDRINUSE;
 854                 dev = ipmr_reg_vif(net, mrt);
 855                 if (!dev)
 856                         return -ENOBUFS;
 857                 err = dev_set_allmulti(dev, 1);
 858                 if (err) {
 859                         unregister_netdevice(dev);
 860                         dev_put(dev);
 861                         return err;
 862                 }
 863                 break;
 864         case VIFF_TUNNEL:
 865                 dev = ipmr_new_tunnel(net, vifc);
 866                 if (!dev)
 867                         return -ENOBUFS;
 868                 err = dev_set_allmulti(dev, 1);
 869                 if (err) {
 870                         ipmr_del_tunnel(dev, vifc);
 871                         dev_put(dev);
 872                         return err;
 873                 }
 874                 break;
 875         case VIFF_USE_IFINDEX:
 876         case 0:
 877                 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
 878                         dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
 879                         if (dev && !__in_dev_get_rtnl(dev)) {
 880                                 dev_put(dev);
 881                                 return -EADDRNOTAVAIL;
 882                         }
 883                 } else {
 884                         dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
 885                 }
 886                 if (!dev)
 887                         return -EADDRNOTAVAIL;
 888                 err = dev_set_allmulti(dev, 1);
 889                 if (err) {
 890                         dev_put(dev);
 891                         return err;
 892                 }
 893                 break;
 894         default:
 895                 return -EINVAL;
 896         }
 897
 898         in_dev = __in_dev_get_rtnl(dev);
 899         if (!in_dev) {
 900                 dev_put(dev);
 901                 return -EADDRNOTAVAIL;
 902         }
 903         IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
 904         inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
 905                                     dev->ifindex, &in_dev->cnf);
 906         ip_rt_multicast_event(in_dev);
 907
 908         /* Fill in the VIF structures */
 909         vif_device_init(v, dev, vifc->vifc_rate_limit,
 910                         vifc->vifc_threshold,
 911                         vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
 912                         (VIFF_TUNNEL | VIFF_REGISTER));
 913
 914         err = dev_get_port_parent_id(dev, &ppid, true);
 915         if (err == 0) {
 916                 memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
 917                 v->dev_parent_id.id_len = ppid.id_len;
 918         } else {
 919                 v->dev_parent_id.id_len = 0;
 920         }
 921
 922         v->local = vifc->vifc_lcl_addr.s_addr;
 923         v->remote = vifc->vifc_rmt_addr.s_addr;
 924
 925         /* And finish update writing critical data */
 926         write_lock_bh(&mrt_lock);
 927         v->dev = dev;
 928         if (v->flags & VIFF_REGISTER)
 929                 mrt->mroute_reg_vif_num = vifi;
 930         if (vifi+1 > mrt->maxvif)
 931                 mrt->maxvif = vifi+1;
 932         write_unlock_bh(&mrt_lock);
 933         call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, vifi, mrt->id);
 934         return 0;
 935 }
 936
 937 /* called with rcu_read_lock() */
 938 static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
 939                                          __be32 origin,
 940                                          __be32 mcastgrp)
 941 {
 942         struct mfc_cache_cmp_arg arg = {
 943                         .mfc_mcastgrp = mcastgrp,
 944                         .mfc_origin = origin
 945         };
 946
 947         return mr_mfc_find(mrt, &arg);
 948 }
 949
 950 /* Look for a (*,G) entry */
 951 static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
 952                                              __be32 mcastgrp, int vifi)
 953 {
 954         struct mfc_cache_cmp_arg arg = {
 955                         .mfc_mcastgrp = mcastgrp,
 956                         .mfc_origin = htonl(INADDR_ANY)
 957         };
 958
 959         if (mcastgrp == htonl(INADDR_ANY))
 960                 return mr_mfc_find_any_parent(mrt, vifi);
 961         return mr_mfc_find_any(mrt, vifi, &arg);
 962 }
 963
 964 /* Look for a (S,G,iif) entry if parent != -1 */
 965 static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
 966                                                 __be32 origin, __be32 mcastgrp,
 967                                                 int parent)
 968 {
 969         struct mfc_cache_cmp_arg arg = {
 970                         .mfc_mcastgrp = mcastgrp,
 971                         .mfc_origin = origin,
 972         };
 973
 974         return mr_mfc_find_parent(mrt, &arg, parent);
 975 }
 976
 977 /* Allocate a multicast cache entry */
 978 static struct mfc_cache *ipmr_cache_alloc(void)
 979 {
 980         struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
 981
 982         if (c) {
 983                 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
 984                 c->_c.mfc_un.res.minvif = MAXVIFS;
 985                 c->_c.free = ipmr_cache_free_rcu;
 986                 refcount_set(&c->_c.mfc_un.res.refcount, 1);
 987         }
 988         return c;
 989 }
 990
 991 static struct mfc_cache *ipmr_cache_alloc_unres(void)
 992 {
 993         struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
 994
 995         if (c) {
 996                 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
 997                 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
 998         }
 999         return c;
1000 }
1001
1002 /* A cache entry has gone into a resolved state from queued */
1003 static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
1004                                struct mfc_cache *uc, struct mfc_cache *c)
1005 {
1006         struct sk_buff *skb;
1007         struct nlmsgerr *e;
1008
1009         /* Play the pending entries through our router */
1010         while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1011                 if (ip_hdr(skb)->version == 0) {
1012                         struct nlmsghdr *nlh = skb_pull(skb,
1013                                                         sizeof(struct iphdr));
1014
1015                         if (mr_fill_mroute(mrt, skb, &c->_c,
1016                                            nlmsg_data(nlh)) > 0) {
1017                                 nlh->nlmsg_len = skb_tail_pointer(skb) -
1018                                                  (u8 *)nlh;
1019                         } else {
1020                                 nlh->nlmsg_type = NLMSG_ERROR;
1021                                 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1022                                 skb_trim(skb, nlh->nlmsg_len);
1023                                 e = nlmsg_data(nlh);
1024                                 e->error = -EMSGSIZE;
1025                                 memset(&e->msg, 0, sizeof(e->msg));
1026                         }
1027
1028                         rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1029                 } else {
1030                         ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
1031                 }
1032         }
1033 }
1034
1035 /* Bounce a cache query up to mrouted and netlink.
1036  *
1037  * Called under mrt_lock.
1038  */
1039 static int ipmr_cache_report(struct mr_table *mrt,
1040                              struct sk_buff *pkt, vifi_t vifi, int assert)
1041 {
1042         const int ihl = ip_hdrlen(pkt);
1043         struct sock *mroute_sk;
1044         struct igmphdr *igmp;
1045         struct igmpmsg *msg;
1046         struct sk_buff *skb;
1047         int ret;
1048
1049         if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
1050                 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1051         else
1052                 skb = alloc_skb(128, GFP_ATOMIC);
1053
1054         if (!skb)
1055                 return -ENOBUFS;
1056
1057         if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
1058                 /* Ugly, but we have no choice with this interface.
1059                  * Duplicate old header, fix ihl, length etc.
1060                  * And all this only to mangle msg->im_msgtype and
1061                  * to set msg->im_mbz to "mbz" :-)
1062                  */
1063                 skb_push(skb, sizeof(struct iphdr));
1064                 skb_reset_network_header(skb);
1065                 skb_reset_transport_header(skb);
1066                 msg = (struct igmpmsg *)skb_network_header(skb);
1067                 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
1068                 msg->im_msgtype = assert;
1069                 msg->im_mbz = 0;
1070                 if (assert == IGMPMSG_WRVIFWHOLE)
1071                         msg->im_vif = vifi;
1072                 else
1073                         msg->im_vif = mrt->mroute_reg_vif_num;
1074                 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1075                 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1076                                              sizeof(struct iphdr));
1077         } else {
1078                 /* Copy the IP header */
1079                 skb_set_network_header(skb, skb->len);
1080                 skb_put(skb, ihl);
1081                 skb_copy_to_linear_data(skb, pkt->data, ihl);
1082                 /* Flag to the kernel this is a route add */
1083                 ip_hdr(skb)->protocol = 0;
1084                 msg = (struct igmpmsg *)skb_network_header(skb);
1085                 msg->im_vif = vifi;
1086                 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1087                 /* Add our header */
1088                 igmp = skb_put(skb, sizeof(struct igmphdr));
1089                 igmp->type = assert;
1090                 msg->im_msgtype = assert;
1091                 igmp->code = 0;
1092                 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1093                 skb->transport_header = skb->network_header;
1094         }
1095
1096         rcu_read_lock();
1097         mroute_sk = rcu_dereference(mrt->mroute_sk);
1098         if (!mroute_sk) {
1099                 rcu_read_unlock();
1100                 kfree_skb(skb);
1101                 return -EINVAL;
1102         }
1103
1104         igmpmsg_netlink_event(mrt, skb);
1105
1106         /* Deliver to mrouted */
1107         ret = sock_queue_rcv_skb(mroute_sk, skb);
1108         rcu_read_unlock();
1109         if (ret < 0) {
1110                 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1111                 kfree_skb(skb);
1112         }
1113
1114         return ret;
1115 }
1116
1117 /* Queue a packet for resolution. It gets locked cache entry! */
1118 static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
1119                                  struct sk_buff *skb, struct net_device *dev)
1120 {
1121         const struct iphdr *iph = ip_hdr(skb);
1122         struct mfc_cache *c;
1123         bool found = false;
1124         int err;
1125
1126         spin_lock_bh(&mfc_unres_lock);
1127         list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1128                 if (c->mfc_mcastgrp == iph->daddr &&
1129                     c->mfc_origin == iph->saddr) {
1130                         found = true;
1131                         break;
1132                 }
1133         }
1134
1135         if (!found) {
1136                 /* Create a new entry if allowable */
1137                 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1138                     (c = ipmr_cache_alloc_unres()) == NULL) {
1139                         spin_unlock_bh(&mfc_unres_lock);
1140
1141                         kfree_skb(skb);
1142                         return -ENOBUFS;
1143                 }
1144
1145                 /* Fill in the new cache entry */
1146                 c->_c.mfc_parent = -1;
1147                 c->mfc_origin   = iph->saddr;
1148                 c->mfc_mcastgrp = iph->daddr;
1149
1150                 /* Reflect first query at mrouted. */
1151                 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1152
1153                 if (err < 0) {
1154                         /* If the report failed throw the cache entry
1155                            out - Brad Parker
1156                          */
1157                         spin_unlock_bh(&mfc_unres_lock);
1158
1159                         ipmr_cache_free(c);
1160                         kfree_skb(skb);
1161                         return err;
1162                 }
1163
1164                 atomic_inc(&mrt->cache_resolve_queue_len);
1165                 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1166                 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1167
1168                 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1169                         mod_timer(&mrt->ipmr_expire_timer,
1170                                   c->_c.mfc_un.unres.expires);
1171         }
1172
1173         /* See if we can append the packet */
1174         if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1175                 kfree_skb(skb);
1176                 err = -ENOBUFS;
1177         } else {
1178                 if (dev) {
1179                         skb->dev = dev;
1180                         skb->skb_iif = dev->ifindex;
1181                 }
1182                 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1183                 err = 0;
1184         }
1185
1186         spin_unlock_bh(&mfc_unres_lock);
1187         return err;
1188 }
1189
1190 /* MFC cache manipulation by user space mroute daemon */
1191
1192 static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1193 {
1194         struct net *net = read_pnet(&mrt->net);
1195         struct mfc_cache *c;
1196
1197         /* The entries are added/deleted only under RTNL */
1198         rcu_read_lock();
1199         c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1200                                    mfc->mfcc_mcastgrp.s_addr, parent);
1201         rcu_read_unlock();
1202         if (!c)
1203                 return -ENOENT;
1204         rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
1205         list_del_rcu(&c->_c.list);
1206         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
1207         mroute_netlink_event(mrt, c, RTM_DELROUTE);
1208         mr_cache_put(&c->_c);
1209
1210         return 0;
1211 }
1212
1213 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1214                         struct mfcctl *mfc, int mrtsock, int parent)
1215 {
1216         struct mfc_cache *uc, *c;
1217         struct mr_mfc *_uc;
1218         bool found;
1219         int ret;
1220
1221         if (mfc->mfcc_parent >= MAXVIFS)
1222                 return -ENFILE;
1223
1224         /* The entries are added/deleted only under RTNL */
1225         rcu_read_lock();
1226         c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1227                                    mfc->mfcc_mcastgrp.s_addr, parent);
1228         rcu_read_unlock();
1229         if (c) {
1230                 write_lock_bh(&mrt_lock);
1231                 c->_c.mfc_parent = mfc->mfcc_parent;
1232                 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1233                 if (!mrtsock)
1234                         c->_c.mfc_flags |= MFC_STATIC;
1235                 write_unlock_bh(&mrt_lock);
1236                 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
1237                                               mrt->id);
1238                 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1239                 return 0;
1240         }
1241
1242         if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1243             !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1244                 return -EINVAL;
1245
1246         c = ipmr_cache_alloc();
1247         if (!c)
1248                 return -ENOMEM;
1249
1250         c->mfc_origin = mfc->mfcc_origin.s_addr;
1251         c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1252         c->_c.mfc_parent = mfc->mfcc_parent;
1253         ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1254         if (!mrtsock)
1255                 c->_c.mfc_flags |= MFC_STATIC;
1256
1257         ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1258                                   ipmr_rht_params);
1259         if (ret) {
1260                 pr_err("ipmr: rhtable insert error %d\n", ret);
1261                 ipmr_cache_free(c);
1262                 return ret;
1263         }
1264         list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1265         /* Check to see if we resolved a queued list. If so we
1266          * need to send on the frames and tidy up.
1267          */
1268         found = false;
1269         spin_lock_bh(&mfc_unres_lock);
1270         list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1271                 uc = (struct mfc_cache *)_uc;
1272                 if (uc->mfc_origin == c->mfc_origin &&
1273                     uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1274                         list_del(&_uc->list);
1275                         atomic_dec(&mrt->cache_resolve_queue_len);
1276                         found = true;
1277                         break;
1278                 }
1279         }
1280         if (list_empty(&mrt->mfc_unres_queue))
1281                 del_timer(&mrt->ipmr_expire_timer);
1282         spin_unlock_bh(&mfc_unres_lock);
1283
1284         if (found) {
1285                 ipmr_cache_resolve(net, mrt, uc, c);
1286                 ipmr_cache_free(uc);
1287         }
1288         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
1289         mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1290         return 0;
1291 }
1292
1293 /* Close the multicast socket, and clear the vif tables etc */
1294 static void mroute_clean_tables(struct mr_table *mrt, int flags)
1295 {
1296         struct net *net = read_pnet(&mrt->net);
1297         struct mr_mfc *c, *tmp;
1298         struct mfc_cache *cache;
1299         LIST_HEAD(list);
1300         int i;
1301
1302         /* Shut down all active vif entries */
1303         if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
1304                 for (i = 0; i < mrt->maxvif; i++) {
1305                         if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1306                              !(flags & MRT_FLUSH_VIFS_STATIC)) ||
1307                             (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
1308                                 continue;
1309                         vif_delete(mrt, i, 0, &list);
1310                 }
1311                 unregister_netdevice_many(&list);
1312         }
1313
1314         /* Wipe the cache */
1315         if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
1316                 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1317                         if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
1318                             (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
1319                                 continue;
1320                         rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1321                         list_del_rcu(&c->list);
1322                         cache = (struct mfc_cache *)c;
1323                         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
1324                                                       mrt->id);
1325                         mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1326                         mr_cache_put(c);
1327                 }
1328         }
1329
1330         if (flags & MRT_FLUSH_MFC) {
1331                 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1332                         spin_lock_bh(&mfc_unres_lock);
1333                         list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1334                                 list_del(&c->list);
1335                                 cache = (struct mfc_cache *)c;
1336                                 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1337                                 ipmr_destroy_unres(mrt, cache);
1338                         }
1339                         spin_unlock_bh(&mfc_unres_lock);
1340                 }
1341         }
1342 }
1343
1344 /* called from ip_ra_control(), before an RCU grace period,
1345  * we dont need to call synchronize_rcu() here
1346  */
1347 static void mrtsock_destruct(struct sock *sk)
1348 {
1349         struct net *net = sock_net(sk);
1350         struct mr_table *mrt;
1351
1352         rtnl_lock();
1353         ipmr_for_each_table(mrt, net) {
1354                 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1355                         IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1356                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1357                                                     NETCONFA_MC_FORWARDING,
1358                                                     NETCONFA_IFINDEX_ALL,
1359                                                     net->ipv4.devconf_all);
1360                         RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1361                         mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
1362                 }
1363         }
1364         rtnl_unlock();
1365 }
1366
1367 /* Socket options and virtual interface manipulation. The whole
1368  * virtual interface system is a complete heap, but unfortunately
1369  * that's how BSD mrouted happens to think. Maybe one day with a proper
1370  * MOSPF/PIM router set up we can clean this up.
1371  */
1372
1373 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
1374                          unsigned int optlen)
1375 {
1376         struct net *net = sock_net(sk);
1377         int val, ret = 0, parent = 0;
1378         struct mr_table *mrt;
1379         struct vifctl vif;
1380         struct mfcctl mfc;
1381         bool do_wrvifwhole;
1382         u32 uval;
1383
1384         /* There's one exception to the lock - MRT_DONE which needs to unlock */
1385         rtnl_lock();
1386         if (sk->sk_type != SOCK_RAW ||
1387             inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1388                 ret = -EOPNOTSUPP;
1389                 goto out_unlock;
1390         }
1391
1392         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1393         if (!mrt) {
1394                 ret = -ENOENT;
1395                 goto out_unlock;
1396         }
1397         if (optname != MRT_INIT) {
1398                 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1399                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1400                         ret = -EACCES;
1401                         goto out_unlock;
1402                 }
1403         }
1404
1405         switch (optname) {
1406         case MRT_INIT:
1407                 if (optlen != sizeof(int)) {
1408                         ret = -EINVAL;
1409                         break;
1410                 }
1411                 if (rtnl_dereference(mrt->mroute_sk)) {
1412                         ret = -EADDRINUSE;
1413                         break;
1414                 }
1415
1416                 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1417                 if (ret == 0) {
1418                         rcu_assign_pointer(mrt->mroute_sk, sk);
1419                         IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1420                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1421                                                     NETCONFA_MC_FORWARDING,
1422                                                     NETCONFA_IFINDEX_ALL,
1423                                                     net->ipv4.devconf_all);
1424                 }
1425                 break;
1426         case MRT_DONE:
1427                 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1428                         ret = -EACCES;
1429                 } else {
1430                         /* We need to unlock here because mrtsock_destruct takes
1431                          * care of rtnl itself and we can't change that due to
1432                          * the IP_ROUTER_ALERT setsockopt which runs without it.
1433                          */
1434                         rtnl_unlock();
1435                         ret = ip_ra_control(sk, 0, NULL);
1436                         goto out;
1437                 }
1438                 break;
1439         case MRT_ADD_VIF:
1440         case MRT_DEL_VIF:
1441                 if (optlen != sizeof(vif)) {
1442                         ret = -EINVAL;
1443                         break;
1444                 }
1445                 if (copy_from_user(&vif, optval, sizeof(vif))) {
1446                         ret = -EFAULT;
1447                         break;
1448                 }
1449                 if (vif.vifc_vifi >= MAXVIFS) {
1450                         ret = -ENFILE;
1451                         break;
1452                 }
1453                 if (optname == MRT_ADD_VIF) {
1454                         ret = vif_add(net, mrt, &vif,
1455                                       sk == rtnl_dereference(mrt->mroute_sk));
1456                 } else {
1457                         ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1458                 }
1459                 break;
1460         /* Manipulate the forwarding caches. These live
1461          * in a sort of kernel/user symbiosis.
1462          */
1463         case MRT_ADD_MFC:
1464         case MRT_DEL_MFC:
1465                 parent = -1;
1466                 /* fall through */
1467         case MRT_ADD_MFC_PROXY:
1468         case MRT_DEL_MFC_PROXY:
1469                 if (optlen != sizeof(mfc)) {
1470                         ret = -EINVAL;
1471                         break;
1472                 }
1473                 if (copy_from_user(&mfc, optval, sizeof(mfc))) {
1474                         ret = -EFAULT;
1475                         break;
1476                 }
1477                 if (parent == 0)
1478                         parent = mfc.mfcc_parent;
1479                 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1480                         ret = ipmr_mfc_delete(mrt, &mfc, parent);
1481                 else
1482                         ret = ipmr_mfc_add(net, mrt, &mfc,
1483                                            sk == rtnl_dereference(mrt->mroute_sk),
1484                                            parent);
1485                 break;
1486         case MRT_FLUSH:
1487                 if (optlen != sizeof(val)) {
1488                         ret = -EINVAL;
1489                         break;
1490                 }
1491                 if (get_user(val, (int __user *)optval)) {
1492                         ret = -EFAULT;
1493                         break;
1494                 }
1495                 mroute_clean_tables(mrt, val);
1496                 break;
1497         /* Control PIM assert. */
1498         case MRT_ASSERT:
1499                 if (optlen != sizeof(val)) {
1500                         ret = -EINVAL;
1501                         break;
1502                 }
1503                 if (get_user(val, (int __user *)optval)) {
1504                         ret = -EFAULT;
1505                         break;
1506                 }
1507                 mrt->mroute_do_assert = val;
1508                 break;
1509         case MRT_PIM:
1510                 if (!ipmr_pimsm_enabled()) {
1511                         ret = -ENOPROTOOPT;
1512                         break;
1513                 }
1514                 if (optlen != sizeof(val)) {
1515                         ret = -EINVAL;
1516                         break;
1517                 }
1518                 if (get_user(val, (int __user *)optval)) {
1519                         ret = -EFAULT;
1520                         break;
1521                 }
1522
1523                 do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
1524                 val = !!val;
1525                 if (val != mrt->mroute_do_pim) {
1526                         mrt->mroute_do_pim = val;
1527                         mrt->mroute_do_assert = val;
1528                         mrt->mroute_do_wrvifwhole = do_wrvifwhole;
1529                 }
1530                 break;
1531         case MRT_TABLE:
1532                 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1533                         ret = -ENOPROTOOPT;
1534                         break;
1535                 }
1536                 if (optlen != sizeof(uval)) {
1537                         ret = -EINVAL;
1538                         break;
1539                 }
1540                 if (get_user(uval, (u32 __user *)optval)) {
1541                         ret = -EFAULT;
1542                         break;
1543                 }
1544
1545                 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1546                         ret = -EBUSY;
1547                 } else {
1548                         mrt = ipmr_new_table(net, uval);
1549                         if (IS_ERR(mrt))
1550                                 ret = PTR_ERR(mrt);
1551                         else
1552                                 raw_sk(sk)->ipmr_table = uval;
1553                 }
1554                 break;
1555         /* Spurious command, or MRT_VERSION which you cannot set. */
1556         default:
1557                 ret = -ENOPROTOOPT;
1558         }
1559 out_unlock:
1560         rtnl_unlock();
1561 out:
1562         return ret;
1563 }
1564
1565 /* Getsock opt support for the multicast routing system. */
1566 int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1567 {
1568         int olr;
1569         int val;
1570         struct net *net = sock_net(sk);
1571         struct mr_table *mrt;
1572
1573         if (sk->sk_type != SOCK_RAW ||
1574             inet_sk(sk)->inet_num != IPPROTO_IGMP)
1575                 return -EOPNOTSUPP;
1576
1577         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1578         if (!mrt)
1579                 return -ENOENT;
1580
1581         switch (optname) {
1582         case MRT_VERSION:
1583                 val = 0x0305;
1584                 break;
1585         case MRT_PIM:
1586                 if (!ipmr_pimsm_enabled())
1587                         return -ENOPROTOOPT;
1588                 val = mrt->mroute_do_pim;
1589                 break;
1590         case MRT_ASSERT:
1591                 val = mrt->mroute_do_assert;
1592                 break;
1593         default:
1594                 return -ENOPROTOOPT;
1595         }
1596
1597         if (get_user(olr, optlen))
1598                 return -EFAULT;
1599         olr = min_t(unsigned int, olr, sizeof(int));
1600         if (olr < 0)
1601                 return -EINVAL;
1602         if (put_user(olr, optlen))
1603                 return -EFAULT;
1604         if (copy_to_user(optval, &val, olr))
1605                 return -EFAULT;
1606         return 0;
1607 }
1608
1609 /* The IP multicast ioctl support routines. */
1610 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1611 {
1612         struct sioc_sg_req sr;
1613         struct sioc_vif_req vr;
1614         struct vif_device *vif;
1615         struct mfc_cache *c;
1616         struct net *net = sock_net(sk);
1617         struct mr_table *mrt;
1618
1619         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1620         if (!mrt)
1621                 return -ENOENT;
1622
1623         switch (cmd) {
1624         case SIOCGETVIFCNT:
1625                 if (copy_from_user(&vr, arg, sizeof(vr)))
1626                         return -EFAULT;
1627                 if (vr.vifi >= mrt->maxvif)
1628                         return -EINVAL;
1629                 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1630                 read_lock(&mrt_lock);
1631                 vif = &mrt->vif_table[vr.vifi];
1632                 if (VIF_EXISTS(mrt, vr.vifi)) {
1633                         vr.icount = vif->pkt_in;
1634                         vr.ocount = vif->pkt_out;
1635                         vr.ibytes = vif->bytes_in;
1636                         vr.obytes = vif->bytes_out;
1637                         read_unlock(&mrt_lock);
1638
1639                         if (copy_to_user(arg, &vr, sizeof(vr)))
1640                                 return -EFAULT;
1641                         return 0;
1642                 }
1643                 read_unlock(&mrt_lock);
1644                 return -EADDRNOTAVAIL;
1645         case SIOCGETSGCNT:
1646                 if (copy_from_user(&sr, arg, sizeof(sr)))
1647                         return -EFAULT;
1648
1649                 rcu_read_lock();
1650                 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1651                 if (c) {
1652                         sr.pktcnt = c->_c.mfc_un.res.pkt;
1653                         sr.bytecnt = c->_c.mfc_un.res.bytes;
1654                         sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1655                         rcu_read_unlock();
1656
1657                         if (copy_to_user(arg, &sr, sizeof(sr)))
1658                                 return -EFAULT;
1659                         return 0;
1660                 }
1661                 rcu_read_unlock();
1662                 return -EADDRNOTAVAIL;
1663         default:
1664                 return -ENOIOCTLCMD;
1665         }
1666 }
1667
1668 #ifdef CONFIG_COMPAT
1669 struct compat_sioc_sg_req {
1670         struct in_addr src;
1671         struct in_addr grp;
1672         compat_ulong_t pktcnt;
1673         compat_ulong_t bytecnt;
1674         compat_ulong_t wrong_if;
1675 };
1676
1677 struct compat_sioc_vif_req {
1678         vifi_t  vifi;           /* Which iface */
1679         compat_ulong_t icount;
1680         compat_ulong_t ocount;
1681         compat_ulong_t ibytes;
1682         compat_ulong_t obytes;
1683 };
1684
1685 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1686 {
1687         struct compat_sioc_sg_req sr;
1688         struct compat_sioc_vif_req vr;
1689         struct vif_device *vif;
1690         struct mfc_cache *c;
1691         struct net *net = sock_net(sk);
1692         struct mr_table *mrt;
1693
1694         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1695         if (!mrt)
1696                 return -ENOENT;
1697
1698         switch (cmd) {
1699         case SIOCGETVIFCNT:
1700                 if (copy_from_user(&vr, arg, sizeof(vr)))
1701                         return -EFAULT;
1702                 if (vr.vifi >= mrt->maxvif)
1703                         return -EINVAL;
1704                 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1705                 read_lock(&mrt_lock);
1706                 vif = &mrt->vif_table[vr.vifi];
1707                 if (VIF_EXISTS(mrt, vr.vifi)) {
1708                         vr.icount = vif->pkt_in;
1709                         vr.ocount = vif->pkt_out;
1710                         vr.ibytes = vif->bytes_in;
1711                         vr.obytes = vif->bytes_out;
1712                         read_unlock(&mrt_lock);
1713
1714                         if (copy_to_user(arg, &vr, sizeof(vr)))
1715                                 return -EFAULT;
1716                         return 0;
1717                 }
1718                 read_unlock(&mrt_lock);
1719                 return -EADDRNOTAVAIL;
1720         case SIOCGETSGCNT:
1721                 if (copy_from_user(&sr, arg, sizeof(sr)))
1722                         return -EFAULT;
1723
1724                 rcu_read_lock();
1725                 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1726                 if (c) {
1727                         sr.pktcnt = c->_c.mfc_un.res.pkt;
1728                         sr.bytecnt = c->_c.mfc_un.res.bytes;
1729                         sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1730                         rcu_read_unlock();
1731
1732                         if (copy_to_user(arg, &sr, sizeof(sr)))
1733                                 return -EFAULT;
1734                         return 0;
1735                 }
1736                 rcu_read_unlock();
1737                 return -EADDRNOTAVAIL;
1738         default:
1739                 return -ENOIOCTLCMD;
1740         }
1741 }
1742 #endif
1743
1744 static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1745 {
1746         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1747         struct net *net = dev_net(dev);
1748         struct mr_table *mrt;
1749         struct vif_device *v;
1750         int ct;
1751
1752         if (event != NETDEV_UNREGISTER)
1753                 return NOTIFY_DONE;
1754
1755         ipmr_for_each_table(mrt, net) {
1756                 v = &mrt->vif_table[0];
1757                 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1758                         if (v->dev == dev)
1759                                 vif_delete(mrt, ct, 1, NULL);
1760                 }
1761         }
1762         return NOTIFY_DONE;
1763 }
1764
1765 static struct notifier_block ip_mr_notifier = {
1766         .notifier_call = ipmr_device_event,
1767 };
1768
1769 /* Encapsulate a packet by attaching a valid IPIP header to it.
1770  * This avoids tunnel drivers and other mess and gives us the speed so
1771  * important for multicast video.
1772  */
1773 static void ip_encap(struct net *net, struct sk_buff *skb,
1774                      __be32 saddr, __be32 daddr)
1775 {
1776         struct iphdr *iph;
1777         const struct iphdr *old_iph = ip_hdr(skb);
1778
1779         skb_push(skb, sizeof(struct iphdr));
1780         skb->transport_header = skb->network_header;
1781         skb_reset_network_header(skb);
1782         iph = ip_hdr(skb);
1783
1784         iph->version    =       4;
1785         iph->tos        =       old_iph->tos;
1786         iph->ttl        =       old_iph->ttl;
1787         iph->frag_off   =       0;
1788         iph->daddr      =       daddr;
1789         iph->saddr      =       saddr;
1790         iph->protocol   =       IPPROTO_IPIP;
1791         iph->ihl        =       5;
1792         iph->tot_len    =       htons(skb->len);
1793         ip_select_ident(net, skb, NULL);
1794         ip_send_check(iph);
1795
1796         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1797         nf_reset(skb);
1798 }
1799
1800 static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1801                                       struct sk_buff *skb)
1802 {
1803         struct ip_options *opt = &(IPCB(skb)->opt);
1804
1805         IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1806         IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1807
1808         if (unlikely(opt->optlen))
1809                 ip_forward_options(skb);
1810
1811         return dst_output(net, sk, skb);
1812 }
1813
1814 #ifdef CONFIG_NET_SWITCHDEV
1815 static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1816                                    int in_vifi, int out_vifi)
1817 {
1818         struct vif_device *out_vif = &mrt->vif_table[out_vifi];
1819         struct vif_device *in_vif = &mrt->vif_table[in_vifi];
1820
1821         if (!skb->offload_l3_fwd_mark)
1822                 return false;
1823         if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
1824                 return false;
1825         return netdev_phys_item_id_same(&out_vif->dev_parent_id,
1826                                         &in_vif->dev_parent_id);
1827 }
1828 #else
1829 static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1830                                    int in_vifi, int out_vifi)
1831 {
1832         return false;
1833 }
1834 #endif
1835
1836 /* Processing handlers for ipmr_forward */
1837
1838 static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1839                             int in_vifi, struct sk_buff *skb, int vifi)
1840 {
1841         const struct iphdr *iph = ip_hdr(skb);
1842         struct vif_device *vif = &mrt->vif_table[vifi];
1843         struct net_device *dev;
1844         struct rtable *rt;
1845         struct flowi4 fl4;
1846         int    encap = 0;
1847
1848         if (!vif->dev)
1849                 goto out_free;
1850
1851         if (vif->flags & VIFF_REGISTER) {
1852                 vif->pkt_out++;
1853                 vif->bytes_out += skb->len;
1854                 vif->dev->stats.tx_bytes += skb->len;
1855                 vif->dev->stats.tx_packets++;
1856                 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1857                 goto out_free;
1858         }
1859
1860         if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
1861                 goto out_free;
1862
1863         if (vif->flags & VIFF_TUNNEL) {
1864                 rt = ip_route_output_ports(net, &fl4, NULL,
1865                                            vif->remote, vif->local,
1866                                            0, 0,
1867                                            IPPROTO_IPIP,
1868                                            RT_TOS(iph->tos), vif->link);
1869                 if (IS_ERR(rt))
1870                         goto out_free;
1871                 encap = sizeof(struct iphdr);
1872         } else {
1873                 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1874                                            0, 0,
1875                                            IPPROTO_IPIP,
1876                                            RT_TOS(iph->tos), vif->link);
1877                 if (IS_ERR(rt))
1878                         goto out_free;
1879         }
1880
1881         dev = rt->dst.dev;
1882
1883         if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1884                 /* Do not fragment multicasts. Alas, IPv4 does not
1885                  * allow to send ICMP, so that packets will disappear
1886                  * to blackhole.
1887                  */
1888                 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1889                 ip_rt_put(rt);
1890                 goto out_free;
1891         }
1892
1893         encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1894
1895         if (skb_cow(skb, encap)) {
1896                 ip_rt_put(rt);
1897                 goto out_free;
1898         }
1899
1900         vif->pkt_out++;
1901         vif->bytes_out += skb->len;
1902
1903         skb_dst_drop(skb);
1904         skb_dst_set(skb, &rt->dst);
1905         ip_decrease_ttl(ip_hdr(skb));
1906
1907         /* FIXME: forward and output firewalls used to be called here.
1908          * What do we do with netfilter? -- RR
1909          */
1910         if (vif->flags & VIFF_TUNNEL) {
1911                 ip_encap(net, skb, vif->local, vif->remote);
1912                 /* FIXME: extra output firewall step used to be here. --RR */
1913                 vif->dev->stats.tx_packets++;
1914                 vif->dev->stats.tx_bytes += skb->len;
1915         }
1916
1917         IPCB(skb)->flags |= IPSKB_FORWARDED;
1918
1919         /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1920          * not only before forwarding, but after forwarding on all output
1921          * interfaces. It is clear, if mrouter runs a multicasting
1922          * program, it should receive packets not depending to what interface
1923          * program is joined.
1924          * If we will not make it, the program will have to join on all
1925          * interfaces. On the other hand, multihoming host (or router, but
1926          * not mrouter) cannot join to more than one interface - it will
1927          * result in receiving multiple packets.
1928          */
1929         NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1930                 net, NULL, skb, skb->dev, dev,
1931                 ipmr_forward_finish);
1932         return;
1933
1934 out_free:
1935         kfree_skb(skb);
1936 }
1937
1938 static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1939 {
1940         int ct;
1941
1942         for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1943                 if (mrt->vif_table[ct].dev == dev)
1944                         break;
1945         }
1946         return ct;
1947 }
1948
1949 /* "local" means that we should preserve one skb (for local delivery) */
1950 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
1951                           struct net_device *dev, struct sk_buff *skb,
1952                           struct mfc_cache *c, int local)
1953 {
1954         int true_vifi = ipmr_find_vif(mrt, dev);
1955         int psend = -1;
1956         int vif, ct;
1957
1958         vif = c->_c.mfc_parent;
1959         c->_c.mfc_un.res.pkt++;
1960         c->_c.mfc_un.res.bytes += skb->len;
1961         c->_c.mfc_un.res.lastuse = jiffies;
1962
1963         if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1964                 struct mfc_cache *cache_proxy;
1965
1966                 /* For an (*,G) entry, we only check that the incomming
1967                  * interface is part of the static tree.
1968                  */
1969                 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
1970                 if (cache_proxy &&
1971                     cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
1972                         goto forward;
1973         }
1974
1975         /* Wrong interface: drop packet and (maybe) send PIM assert. */
1976         if (mrt->vif_table[vif].dev != dev) {
1977                 if (rt_is_output_route(skb_rtable(skb))) {
1978                         /* It is our own packet, looped back.
1979                          * Very complicated situation...
1980                          *
1981                          * The best workaround until routing daemons will be
1982                          * fixed is not to redistribute packet, if it was
1983                          * send through wrong interface. It means, that
1984                          * multicast applications WILL NOT work for
1985                          * (S,G), which have default multicast route pointing
1986                          * to wrong oif. In any case, it is not a good
1987                          * idea to use multicasting applications on router.
1988                          */
1989                         goto dont_forward;
1990                 }
1991
1992                 c->_c.mfc_un.res.wrong_if++;
1993
1994                 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1995                     /* pimsm uses asserts, when switching from RPT to SPT,
1996                      * so that we cannot check that packet arrived on an oif.
1997                      * It is bad, but otherwise we would need to move pretty
1998                      * large chunk of pimd to kernel. Ough... --ANK
1999                      */
2000                     (mrt->mroute_do_pim ||
2001                      c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2002                     time_after(jiffies,
2003                                c->_c.mfc_un.res.last_assert +
2004                                MFC_ASSERT_THRESH)) {
2005                         c->_c.mfc_un.res.last_assert = jiffies;
2006                         ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
2007                         if (mrt->mroute_do_wrvifwhole)
2008                                 ipmr_cache_report(mrt, skb, true_vifi,
2009                                                   IGMPMSG_WRVIFWHOLE);
2010                 }
2011                 goto dont_forward;
2012         }
2013
2014 forward:
2015         mrt->vif_table[vif].pkt_in++;
2016         mrt->vif_table[vif].bytes_in += skb->len;
2017
2018         /* Forward the frame */
2019         if (c->mfc_origin == htonl(INADDR_ANY) &&
2020             c->mfc_mcastgrp == htonl(INADDR_ANY)) {
2021                 if (true_vifi >= 0 &&
2022                     true_vifi != c->_c.mfc_parent &&
2023                     ip_hdr(skb)->ttl >
2024                                 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2025                         /* It's an (*,*) entry and the packet is not coming from
2026                          * the upstream: forward the packet to the upstream
2027                          * only.
2028                          */
2029                         psend = c->_c.mfc_parent;
2030                         goto last_forward;
2031                 }
2032                 goto dont_forward;
2033         }
2034         for (ct = c->_c.mfc_un.res.maxvif - 1;
2035              ct >= c->_c.mfc_un.res.minvif; ct--) {
2036                 /* For (*,G) entry, don't forward to the incoming interface */
2037                 if ((c->mfc_origin != htonl(INADDR_ANY) ||
2038                      ct != true_vifi) &&
2039                     ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
2040                         if (psend != -1) {
2041                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2042
2043                                 if (skb2)
2044                                         ipmr_queue_xmit(net, mrt, true_vifi,
2045                                                         skb2, psend);
2046                         }
2047                         psend = ct;
2048                 }
2049         }
2050 last_forward:
2051         if (psend != -1) {
2052                 if (local) {
2053                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2054
2055                         if (skb2)
2056                                 ipmr_queue_xmit(net, mrt, true_vifi, skb2,
2057                                                 psend);
2058                 } else {
2059                         ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
2060                         return;
2061                 }
2062         }
2063
2064 dont_forward:
2065         if (!local)
2066                 kfree_skb(skb);
2067 }
2068
2069 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
2070 {
2071         struct rtable *rt = skb_rtable(skb);
2072         struct iphdr *iph = ip_hdr(skb);
2073         struct flowi4 fl4 = {
2074                 .daddr = iph->daddr,
2075                 .saddr = iph->saddr,
2076                 .flowi4_tos = RT_TOS(iph->tos),
2077                 .flowi4_oif = (rt_is_output_route(rt) ?
2078                                skb->dev->ifindex : 0),
2079                 .flowi4_iif = (rt_is_output_route(rt) ?
2080                                LOOPBACK_IFINDEX :
2081                                skb->dev->ifindex),
2082                 .flowi4_mark = skb->mark,
2083         };
2084         struct mr_table *mrt;
2085         int err;
2086
2087         err = ipmr_fib_lookup(net, &fl4, &mrt);
2088         if (err)
2089                 return ERR_PTR(err);
2090         return mrt;
2091 }
2092
2093 /* Multicast packets for forwarding arrive here
2094  * Called with rcu_read_lock();
2095  */
2096 int ip_mr_input(struct sk_buff *skb)
2097 {
2098         struct mfc_cache *cache;
2099         struct net *net = dev_net(skb->dev);
2100         int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
2101         struct mr_table *mrt;
2102         struct net_device *dev;
2103
2104         /* skb->dev passed in is the loX master dev for vrfs.
2105          * As there are no vifs associated with loopback devices,
2106          * get the proper interface that does have a vif associated with it.
2107          */
2108         dev = skb->dev;
2109         if (netif_is_l3_master(skb->dev)) {
2110                 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2111                 if (!dev) {
2112                         kfree_skb(skb);
2113                         return -ENODEV;
2114                 }
2115         }
2116
2117         /* Packet is looped back after forward, it should not be
2118          * forwarded second time, but still can be delivered locally.
2119          */
2120         if (IPCB(skb)->flags & IPSKB_FORWARDED)
2121                 goto dont_forward;
2122
2123         mrt = ipmr_rt_fib_lookup(net, skb);
2124         if (IS_ERR(mrt)) {
2125                 kfree_skb(skb);
2126                 return PTR_ERR(mrt);
2127         }
2128         if (!local) {
2129                 if (IPCB(skb)->opt.router_alert) {
2130                         if (ip_call_ra_chain(skb))
2131                                 return 0;
2132                 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2133                         /* IGMPv1 (and broken IGMPv2 implementations sort of
2134                          * Cisco IOS <= 11.2(8)) do not put router alert
2135                          * option to IGMP packets destined to routable
2136                          * groups. It is very bad, because it means
2137                          * that we can forward NO IGMP messages.
2138                          */
2139                         struct sock *mroute_sk;
2140
2141                         mroute_sk = rcu_dereference(mrt->mroute_sk);
2142                         if (mroute_sk) {
2143                                 nf_reset(skb);
2144                                 raw_rcv(mroute_sk, skb);
2145                                 return 0;
2146                         }
2147                     }
2148         }
2149
2150         /* already under rcu_read_lock() */
2151         cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
2152         if (!cache) {
2153                 int vif = ipmr_find_vif(mrt, dev);
2154
2155                 if (vif >= 0)
2156                         cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2157                                                     vif);
2158         }
2159
2160         /* No usable cache entry */
2161         if (!cache) {
2162                 int vif;
2163
2164                 if (local) {
2165                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2166                         ip_local_deliver(skb);
2167                         if (!skb2)
2168                                 return -ENOBUFS;
2169                         skb = skb2;
2170                 }
2171
2172                 read_lock(&mrt_lock);
2173                 vif = ipmr_find_vif(mrt, dev);
2174                 if (vif >= 0) {
2175                         int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev);
2176                         read_unlock(&mrt_lock);
2177
2178                         return err2;
2179                 }
2180                 read_unlock(&mrt_lock);
2181                 kfree_skb(skb);
2182                 return -ENODEV;
2183         }
2184
2185         read_lock(&mrt_lock);
2186         ip_mr_forward(net, mrt, dev, skb, cache, local);
2187         read_unlock(&mrt_lock);
2188
2189         if (local)
2190                 return ip_local_deliver(skb);
2191
2192         return 0;
2193
2194 dont_forward:
2195         if (local)
2196                 return ip_local_deliver(skb);
2197         kfree_skb(skb);
2198         return 0;
2199 }
2200
2201 #ifdef CONFIG_IP_PIMSM_V1
2202 /* Handle IGMP messages of PIMv1 */
2203 int pim_rcv_v1(struct sk_buff *skb)
2204 {
2205         struct igmphdr *pim;
2206         struct net *net = dev_net(skb->dev);
2207         struct mr_table *mrt;
2208
2209         if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2210                 goto drop;
2211
2212         pim = igmp_hdr(skb);
2213
2214         mrt = ipmr_rt_fib_lookup(net, skb);
2215         if (IS_ERR(mrt))
2216                 goto drop;
2217         if (!mrt->mroute_do_pim ||
2218             pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2219                 goto drop;
2220
2221         if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2222 drop:
2223                 kfree_skb(skb);
2224         }
2225         return 0;
2226 }
2227 #endif
2228
2229 #ifdef CONFIG_IP_PIMSM_V2
2230 static int pim_rcv(struct sk_buff *skb)
2231 {
2232         struct pimreghdr *pim;
2233         struct net *net = dev_net(skb->dev);
2234         struct mr_table *mrt;
2235
2236         if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2237                 goto drop;
2238
2239         pim = (struct pimreghdr *)skb_transport_header(skb);
2240         if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
2241             (pim->flags & PIM_NULL_REGISTER) ||
2242             (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2243              csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2244                 goto drop;
2245
2246         mrt = ipmr_rt_fib_lookup(net, skb);
2247         if (IS_ERR(mrt))
2248                 goto drop;
2249         if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2250 drop:
2251                 kfree_skb(skb);
2252         }
2253         return 0;
2254 }
2255 #endif
2256
2257 int ipmr_get_route(struct net *net, struct sk_buff *skb,
2258                    __be32 saddr, __be32 daddr,
2259                    struct rtmsg *rtm, u32 portid)
2260 {
2261         struct mfc_cache *cache;
2262         struct mr_table *mrt;
2263         int err;
2264
2265         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2266         if (!mrt)
2267                 return -ENOENT;
2268
2269         rcu_read_lock();
2270         cache = ipmr_cache_find(mrt, saddr, daddr);
2271         if (!cache && skb->dev) {
2272                 int vif = ipmr_find_vif(mrt, skb->dev);
2273
2274                 if (vif >= 0)
2275                         cache = ipmr_cache_find_any(mrt, daddr, vif);
2276         }
2277         if (!cache) {
2278                 struct sk_buff *skb2;
2279                 struct iphdr *iph;
2280                 struct net_device *dev;
2281                 int vif = -1;
2282
2283                 dev = skb->dev;
2284                 read_lock(&mrt_lock);
2285                 if (dev)
2286                         vif = ipmr_find_vif(mrt, dev);
2287                 if (vif < 0) {
2288                         read_unlock(&mrt_lock);
2289                         rcu_read_unlock();
2290                         return -ENODEV;
2291                 }
2292                 skb2 = skb_clone(skb, GFP_ATOMIC);
2293                 if (!skb2) {
2294                         read_unlock(&mrt_lock);
2295                         rcu_read_unlock();
2296                         return -ENOMEM;
2297                 }
2298
2299                 NETLINK_CB(skb2).portid = portid;
2300                 skb_push(skb2, sizeof(struct iphdr));
2301                 skb_reset_network_header(skb2);
2302                 iph = ip_hdr(skb2);
2303                 iph->ihl = sizeof(struct iphdr) >> 2;
2304                 iph->saddr = saddr;
2305                 iph->daddr = daddr;
2306                 iph->version = 0;
2307                 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
2308                 read_unlock(&mrt_lock);
2309                 rcu_read_unlock();
2310                 return err;
2311         }
2312
2313         read_lock(&mrt_lock);
2314         err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2315         read_unlock(&mrt_lock);
2316         rcu_read_unlock();
2317         return err;
2318 }
2319
2320 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2321                             u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2322                             int flags)
2323 {
2324         struct nlmsghdr *nlh;
2325         struct rtmsg *rtm;
2326         int err;
2327
2328         nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2329         if (!nlh)
2330                 return -EMSGSIZE;
2331
2332         rtm = nlmsg_data(nlh);
2333         rtm->rtm_family   = RTNL_FAMILY_IPMR;
2334         rtm->rtm_dst_len  = 32;
2335         rtm->rtm_src_len  = 32;
2336         rtm->rtm_tos      = 0;
2337         rtm->rtm_table    = mrt->id;
2338         if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2339                 goto nla_put_failure;
2340         rtm->rtm_type     = RTN_MULTICAST;
2341         rtm->rtm_scope    = RT_SCOPE_UNIVERSE;
2342         if (c->_c.mfc_flags & MFC_STATIC)
2343                 rtm->rtm_protocol = RTPROT_STATIC;
2344         else
2345                 rtm->rtm_protocol = RTPROT_MROUTED;
2346         rtm->rtm_flags    = 0;
2347
2348         if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2349             nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
2350                 goto nla_put_failure;
2351         err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2352         /* do not break the dump if cache is unresolved */
2353         if (err < 0 && err != -ENOENT)
2354                 goto nla_put_failure;
2355
2356         nlmsg_end(skb, nlh);
2357         return 0;
2358
2359 nla_put_failure:
2360         nlmsg_cancel(skb, nlh);
2361         return -EMSGSIZE;
2362 }
2363
2364 static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2365                              u32 portid, u32 seq, struct mr_mfc *c, int cmd,
2366                              int flags)
2367 {
2368         return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
2369                                 cmd, flags);
2370 }
2371
2372 static size_t mroute_msgsize(bool unresolved, int maxvif)
2373 {
2374         size_t len =
2375                 NLMSG_ALIGN(sizeof(struct rtmsg))
2376                 + nla_total_size(4)     /* RTA_TABLE */
2377                 + nla_total_size(4)     /* RTA_SRC */
2378                 + nla_total_size(4)     /* RTA_DST */
2379                 ;
2380
2381         if (!unresolved)
2382                 len = len
2383                       + nla_total_size(4)       /* RTA_IIF */
2384                       + nla_total_size(0)       /* RTA_MULTIPATH */
2385                       + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2386                                                 /* RTA_MFC_STATS */
2387                       + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2388                 ;
2389
2390         return len;
2391 }
2392
2393 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2394                                  int cmd)
2395 {
2396         struct net *net = read_pnet(&mrt->net);
2397         struct sk_buff *skb;
2398         int err = -ENOBUFS;
2399
2400         skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
2401                                        mrt->maxvif),
2402                         GFP_ATOMIC);
2403         if (!skb)
2404                 goto errout;
2405
2406         err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2407         if (err < 0)
2408                 goto errout;
2409
2410         rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2411         return;
2412
2413 errout:
2414         kfree_skb(skb);
2415         if (err < 0)
2416                 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2417 }
2418
2419 static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2420 {
2421         size_t len =
2422                 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2423                 + nla_total_size(1)     /* IPMRA_CREPORT_MSGTYPE */
2424                 + nla_total_size(4)     /* IPMRA_CREPORT_VIF_ID */
2425                 + nla_total_size(4)     /* IPMRA_CREPORT_SRC_ADDR */
2426                 + nla_total_size(4)     /* IPMRA_CREPORT_DST_ADDR */
2427                                         /* IPMRA_CREPORT_PKT */
2428                 + nla_total_size(payloadlen)
2429                 ;
2430
2431         return len;
2432 }
2433
2434 static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2435 {
2436         struct net *net = read_pnet(&mrt->net);
2437         struct nlmsghdr *nlh;
2438         struct rtgenmsg *rtgenm;
2439         struct igmpmsg *msg;
2440         struct sk_buff *skb;
2441         struct nlattr *nla;
2442         int payloadlen;
2443
2444         payloadlen = pkt->len - sizeof(struct igmpmsg);
2445         msg = (struct igmpmsg *)skb_network_header(pkt);
2446
2447         skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2448         if (!skb)
2449                 goto errout;
2450
2451         nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2452                         sizeof(struct rtgenmsg), 0);
2453         if (!nlh)
2454                 goto errout;
2455         rtgenm = nlmsg_data(nlh);
2456         rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2457         if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
2458             nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) ||
2459             nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2460                             msg->im_src.s_addr) ||
2461             nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
2462                             msg->im_dst.s_addr))
2463                 goto nla_put_failure;
2464
2465         nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2466         if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2467                                   nla_data(nla), payloadlen))
2468                 goto nla_put_failure;
2469
2470         nlmsg_end(skb, nlh);
2471
2472         rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2473         return;
2474
2475 nla_put_failure:
2476         nlmsg_cancel(skb, nlh);
2477 errout:
2478         kfree_skb(skb);
2479         rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2480 }
2481
2482 static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
2483                                        const struct nlmsghdr *nlh,
2484                                        struct nlattr **tb,
2485                                        struct netlink_ext_ack *extack)
2486 {
2487         struct rtmsg *rtm;
2488         int i, err;
2489
2490         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2491                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
2492                 return -EINVAL;
2493         }
2494
2495         if (!netlink_strict_get_check(skb))
2496                 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2497                                               rtm_ipv4_policy, extack);
2498
2499         rtm = nlmsg_data(nlh);
2500         if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
2501             (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
2502             rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2503             rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2504                 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
2505                 return -EINVAL;
2506         }
2507
2508         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2509                                             rtm_ipv4_policy, extack);
2510         if (err)
2511                 return err;
2512
2513         if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2514             (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2515                 NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
2516                 return -EINVAL;
2517         }
2518
2519         for (i = 0; i <= RTA_MAX; i++) {
2520                 if (!tb[i])
2521                         continue;
2522
2523                 switch (i) {
2524                 case RTA_SRC:
2525                 case RTA_DST:
2526                 case RTA_TABLE:
2527                         break;
2528                 default:
2529                         NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
2530                         return -EINVAL;
2531                 }
2532         }
2533
2534         return 0;
2535 }
2536
2537 static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2538                              struct netlink_ext_ack *extack)
2539 {
2540         struct net *net = sock_net(in_skb->sk);
2541         struct nlattr *tb[RTA_MAX + 1];
2542         struct sk_buff *skb = NULL;
2543         struct mfc_cache *cache;
2544         struct mr_table *mrt;
2545         __be32 src, grp;
2546         u32 tableid;
2547         int err;
2548
2549         err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
2550         if (err < 0)
2551                 goto errout;
2552
2553         src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2554         grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2555         tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2556
2557         mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2558         if (!mrt) {
2559                 err = -ENOENT;
2560                 goto errout_free;
2561         }
2562
2563         /* entries are added/deleted only under RTNL */
2564         rcu_read_lock();
2565         cache = ipmr_cache_find(mrt, src, grp);
2566         rcu_read_unlock();
2567         if (!cache) {
2568                 err = -ENOENT;
2569                 goto errout_free;
2570         }
2571
2572         skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2573         if (!skb) {
2574                 err = -ENOBUFS;
2575                 goto errout_free;
2576         }
2577
2578         err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2579                                nlh->nlmsg_seq, cache,
2580                                RTM_NEWROUTE, 0);
2581         if (err < 0)
2582                 goto errout_free;
2583
2584         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2585
2586 errout:
2587         return err;
2588
2589 errout_free:
2590         kfree_skb(skb);
2591         goto errout;
2592 }
2593
2594 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2595 {
2596         struct fib_dump_filter filter = {};
2597         int err;
2598
2599         if (cb->strict_check) {
2600                 err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
2601                                             &filter, cb);
2602                 if (err < 0)
2603                         return err;
2604         }
2605
2606         if (filter.table_id) {
2607                 struct mr_table *mrt;
2608
2609                 mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
2610                 if (!mrt) {
2611                         if (filter.dump_all_families)
2612                                 return skb->len;
2613
2614                         NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
2615                         return -ENOENT;
2616                 }
2617                 err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
2618                                     &mfc_unres_lock, &filter);
2619                 return skb->len ? : err;
2620         }
2621
2622         return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
2623                                 _ipmr_fill_mroute, &mfc_unres_lock, &filter);
2624 }
2625
2626 static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2627         [RTA_SRC]       = { .type = NLA_U32 },
2628         [RTA_DST]       = { .type = NLA_U32 },
2629         [RTA_IIF]       = { .type = NLA_U32 },
2630         [RTA_TABLE]     = { .type = NLA_U32 },
2631         [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2632 };
2633
2634 static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2635 {
2636         switch (rtm_protocol) {
2637         case RTPROT_STATIC:
2638         case RTPROT_MROUTED:
2639                 return true;
2640         }
2641         return false;
2642 }
2643
2644 static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2645 {
2646         struct rtnexthop *rtnh = nla_data(nla);
2647         int remaining = nla_len(nla), vifi = 0;
2648
2649         while (rtnh_ok(rtnh, remaining)) {
2650                 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2651                 if (++vifi == MAXVIFS)
2652                         break;
2653                 rtnh = rtnh_next(rtnh, &remaining);
2654         }
2655
2656         return remaining > 0 ? -EINVAL : vifi;
2657 }
2658
2659 /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2660 static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2661                             struct mfcctl *mfcc, int *mrtsock,
2662                             struct mr_table **mrtret,
2663                             struct netlink_ext_ack *extack)
2664 {
2665         struct net_device *dev = NULL;
2666         u32 tblid = RT_TABLE_DEFAULT;
2667         struct mr_table *mrt;
2668         struct nlattr *attr;
2669         struct rtmsg *rtm;
2670         int ret, rem;
2671
2672         ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
2673                                         rtm_ipmr_policy, extack);
2674         if (ret < 0)
2675                 goto out;
2676         rtm = nlmsg_data(nlh);
2677
2678         ret = -EINVAL;
2679         if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2680             rtm->rtm_type != RTN_MULTICAST ||
2681             rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2682             !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2683                 goto out;
2684
2685         memset(mfcc, 0, sizeof(*mfcc));
2686         mfcc->mfcc_parent = -1;
2687         ret = 0;
2688         nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2689                 switch (nla_type(attr)) {
2690                 case RTA_SRC:
2691                         mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2692                         break;
2693                 case RTA_DST:
2694                         mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2695                         break;
2696                 case RTA_IIF:
2697                         dev = __dev_get_by_index(net, nla_get_u32(attr));
2698                         if (!dev) {
2699                                 ret = -ENODEV;
2700                                 goto out;
2701                         }
2702                         break;
2703                 case RTA_MULTIPATH:
2704                         if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2705                                 ret = -EINVAL;
2706                                 goto out;
2707                         }
2708                         break;
2709                 case RTA_PREFSRC:
2710                         ret = 1;
2711                         break;
2712                 case RTA_TABLE:
2713                         tblid = nla_get_u32(attr);
2714                         break;
2715                 }
2716         }
2717         mrt = ipmr_get_table(net, tblid);
2718         if (!mrt) {
2719                 ret = -ENOENT;
2720                 goto out;
2721         }
2722         *mrtret = mrt;
2723         *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2724         if (dev)
2725                 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2726
2727 out:
2728         return ret;
2729 }
2730
2731 /* takes care of both newroute and delroute */
2732 static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2733                           struct netlink_ext_ack *extack)
2734 {
2735         struct net *net = sock_net(skb->sk);
2736         int ret, mrtsock, parent;
2737         struct mr_table *tbl;
2738         struct mfcctl mfcc;
2739
2740         mrtsock = 0;
2741         tbl = NULL;
2742         ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
2743         if (ret < 0)
2744                 return ret;
2745
2746         parent = ret ? mfcc.mfcc_parent : -1;
2747         if (nlh->nlmsg_type == RTM_NEWROUTE)
2748                 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2749         else
2750                 return ipmr_mfc_delete(tbl, &mfcc, parent);
2751 }
2752
2753 static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2754 {
2755         u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2756
2757         if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2758             nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2759             nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2760                         mrt->mroute_reg_vif_num) ||
2761             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2762                        mrt->mroute_do_assert) ||
2763             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
2764             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
2765                        mrt->mroute_do_wrvifwhole))
2766                 return false;
2767
2768         return true;
2769 }
2770
2771 static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2772 {
2773         struct nlattr *vif_nest;
2774         struct vif_device *vif;
2775
2776         /* if the VIF doesn't exist just continue */
2777         if (!VIF_EXISTS(mrt, vifid))
2778                 return true;
2779
2780         vif = &mrt->vif_table[vifid];
2781         vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF);
2782         if (!vif_nest)
2783                 return false;
2784         if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) ||
2785             nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2786             nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2787             nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2788                               IPMRA_VIFA_PAD) ||
2789             nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2790                               IPMRA_VIFA_PAD) ||
2791             nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2792                               IPMRA_VIFA_PAD) ||
2793             nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2794                               IPMRA_VIFA_PAD) ||
2795             nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2796             nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2797                 nla_nest_cancel(skb, vif_nest);
2798                 return false;
2799         }
2800         nla_nest_end(skb, vif_nest);
2801
2802         return true;
2803 }
2804
2805 static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
2806                                struct netlink_ext_ack *extack)
2807 {
2808         struct ifinfomsg *ifm;
2809
2810         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2811                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
2812                 return -EINVAL;
2813         }
2814
2815         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
2816                 NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
2817                 return -EINVAL;
2818         }
2819
2820         ifm = nlmsg_data(nlh);
2821         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2822             ifm->ifi_change || ifm->ifi_index) {
2823                 NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
2824                 return -EINVAL;
2825         }
2826
2827         return 0;
2828 }
2829
2830 static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2831 {
2832         struct net *net = sock_net(skb->sk);
2833         struct nlmsghdr *nlh = NULL;
2834         unsigned int t = 0, s_t;
2835         unsigned int e = 0, s_e;
2836         struct mr_table *mrt;
2837
2838         if (cb->strict_check) {
2839                 int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
2840
2841                 if (err < 0)
2842                         return err;
2843         }
2844
2845         s_t = cb->args[0];
2846         s_e = cb->args[1];
2847
2848         ipmr_for_each_table(mrt, net) {
2849                 struct nlattr *vifs, *af;
2850                 struct ifinfomsg *hdr;
2851                 u32 i;
2852
2853                 if (t < s_t)
2854                         goto skip_table;
2855                 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2856                                 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2857                                 sizeof(*hdr), NLM_F_MULTI);
2858                 if (!nlh)
2859                         break;
2860
2861                 hdr = nlmsg_data(nlh);
2862                 memset(hdr, 0, sizeof(*hdr));
2863                 hdr->ifi_family = RTNL_FAMILY_IPMR;
2864
2865                 af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
2866                 if (!af) {
2867                         nlmsg_cancel(skb, nlh);
2868                         goto out;
2869                 }
2870
2871                 if (!ipmr_fill_table(mrt, skb)) {
2872                         nlmsg_cancel(skb, nlh);
2873                         goto out;
2874                 }
2875
2876                 vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS);
2877                 if (!vifs) {
2878                         nla_nest_end(skb, af);
2879                         nlmsg_end(skb, nlh);
2880                         goto out;
2881                 }
2882                 for (i = 0; i < mrt->maxvif; i++) {
2883                         if (e < s_e)
2884                                 goto skip_entry;
2885                         if (!ipmr_fill_vif(mrt, i, skb)) {
2886                                 nla_nest_end(skb, vifs);
2887                                 nla_nest_end(skb, af);
2888                                 nlmsg_end(skb, nlh);
2889                                 goto out;
2890                         }
2891 skip_entry:
2892                         e++;
2893                 }
2894                 s_e = 0;
2895                 e = 0;
2896                 nla_nest_end(skb, vifs);
2897                 nla_nest_end(skb, af);
2898                 nlmsg_end(skb, nlh);
2899 skip_table:
2900                 t++;
2901         }
2902
2903 out:
2904         cb->args[1] = e;
2905         cb->args[0] = t;
2906
2907         return skb->len;
2908 }
2909
2910 #ifdef CONFIG_PROC_FS
2911 /* The /proc interfaces to multicast routing :
2912  * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2913  */
2914
2915 static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2916         __acquires(mrt_lock)
2917 {
2918         struct mr_vif_iter *iter = seq->private;
2919         struct net *net = seq_file_net(seq);
2920         struct mr_table *mrt;
2921
2922         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2923         if (!mrt)
2924                 return ERR_PTR(-ENOENT);
2925
2926         iter->mrt = mrt;
2927
2928         read_lock(&mrt_lock);
2929         return mr_vif_seq_start(seq, pos);
2930 }
2931
2932 static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2933         __releases(mrt_lock)
2934 {
2935         read_unlock(&mrt_lock);
2936 }
2937
2938 static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2939 {
2940         struct mr_vif_iter *iter = seq->private;
2941         struct mr_table *mrt = iter->mrt;
2942
2943         if (v == SEQ_START_TOKEN) {
2944                 seq_puts(seq,
2945                          "Interface      BytesIn  PktsIn  BytesOut PktsOut Flags Local    Remote\n");
2946         } else {
2947                 const struct vif_device *vif = v;
2948                 const char *name =  vif->dev ?
2949                                     vif->dev->name : "none";
2950
2951                 seq_printf(seq,
2952                            "%2td %-10s %8ld %7ld  %8ld %7ld %05X %08X %08X\n",
2953                            vif - mrt->vif_table,
2954                            name, vif->bytes_in, vif->pkt_in,
2955                            vif->bytes_out, vif->pkt_out,
2956                            vif->flags, vif->local, vif->remote);
2957         }
2958         return 0;
2959 }
2960
2961 static const struct seq_operations ipmr_vif_seq_ops = {
2962         .start = ipmr_vif_seq_start,
2963         .next  = mr_vif_seq_next,
2964         .stop  = ipmr_vif_seq_stop,
2965         .show  = ipmr_vif_seq_show,
2966 };
2967
2968 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2969 {
2970         struct net *net = seq_file_net(seq);
2971         struct mr_table *mrt;
2972
2973         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2974         if (!mrt)
2975                 return ERR_PTR(-ENOENT);
2976
2977         return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
2978 }
2979
2980 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2981 {
2982         int n;
2983
2984         if (v == SEQ_START_TOKEN) {
2985                 seq_puts(seq,
2986                  "Group    Origin   Iif     Pkts    Bytes    Wrong Oifs\n");
2987         } else {
2988                 const struct mfc_cache *mfc = v;
2989                 const struct mr_mfc_iter *it = seq->private;
2990                 const struct mr_table *mrt = it->mrt;
2991
2992                 seq_printf(seq, "%08X %08X %-3hd",
2993                            (__force u32) mfc->mfc_mcastgrp,
2994                            (__force u32) mfc->mfc_origin,
2995                            mfc->_c.mfc_parent);
2996
2997                 if (it->cache != &mrt->mfc_unres_queue) {
2998                         seq_printf(seq, " %8lu %8lu %8lu",
2999                                    mfc->_c.mfc_un.res.pkt,
3000                                    mfc->_c.mfc_un.res.bytes,
3001                                    mfc->_c.mfc_un.res.wrong_if);
3002                         for (n = mfc->_c.mfc_un.res.minvif;
3003                              n < mfc->_c.mfc_un.res.maxvif; n++) {
3004                                 if (VIF_EXISTS(mrt, n) &&
3005                                     mfc->_c.mfc_un.res.ttls[n] < 255)
3006                                         seq_printf(seq,
3007                                            " %2d:%-3d",
3008                                            n, mfc->_c.mfc_un.res.ttls[n]);
3009                         }
3010                 } else {
3011                         /* unresolved mfc_caches don't contain
3012                          * pkt, bytes and wrong_if values
3013                          */
3014                         seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
3015                 }
3016                 seq_putc(seq, '\n');
3017         }
3018         return 0;
3019 }
3020
3021 static const struct seq_operations ipmr_mfc_seq_ops = {
3022         .start = ipmr_mfc_seq_start,
3023         .next  = mr_mfc_seq_next,
3024         .stop  = mr_mfc_seq_stop,
3025         .show  = ipmr_mfc_seq_show,
3026 };
3027 #endif
3028
3029 #ifdef CONFIG_IP_PIMSM_V2
3030 static const struct net_protocol pim_protocol = {
3031         .handler        =       pim_rcv,
3032         .netns_ok       =       1,
3033 };
3034 #endif
3035
3036 static unsigned int ipmr_seq_read(struct net *net)
3037 {
3038         ASSERT_RTNL();
3039
3040         return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
3041 }
3042
3043 static int ipmr_dump(struct net *net, struct notifier_block *nb)
3044 {
3045         return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
3046                        ipmr_mr_table_iter, &mrt_lock);
3047 }
3048
3049 static const struct fib_notifier_ops ipmr_notifier_ops_template = {
3050         .family         = RTNL_FAMILY_IPMR,
3051         .fib_seq_read   = ipmr_seq_read,
3052         .fib_dump       = ipmr_dump,
3053         .owner          = THIS_MODULE,
3054 };
3055
3056 static int __net_init ipmr_notifier_init(struct net *net)
3057 {
3058         struct fib_notifier_ops *ops;
3059
3060         net->ipv4.ipmr_seq = 0;
3061
3062         ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
3063         if (IS_ERR(ops))
3064                 return PTR_ERR(ops);
3065         net->ipv4.ipmr_notifier_ops = ops;
3066
3067         return 0;
3068 }
3069
3070 static void __net_exit ipmr_notifier_exit(struct net *net)
3071 {
3072         fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
3073         net->ipv4.ipmr_notifier_ops = NULL;
3074 }
3075
3076 /* Setup for IP multicast routing */
3077 static int __net_init ipmr_net_init(struct net *net)
3078 {
3079         int err;
3080
3081         err = ipmr_notifier_init(net);
3082         if (err)
3083                 goto ipmr_notifier_fail;
3084
3085         err = ipmr_rules_init(net);
3086         if (err < 0)
3087                 goto ipmr_rules_fail;
3088
3089 #ifdef CONFIG_PROC_FS
3090         err = -ENOMEM;
3091         if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
3092                         sizeof(struct mr_vif_iter)))
3093                 goto proc_vif_fail;
3094         if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
3095                         sizeof(struct mr_mfc_iter)))
3096                 goto proc_cache_fail;
3097 #endif
3098         return 0;
3099
3100 #ifdef CONFIG_PROC_FS
3101 proc_cache_fail:
3102         remove_proc_entry("ip_mr_vif", net->proc_net);
3103 proc_vif_fail:
3104         ipmr_rules_exit(net);
3105 #endif
3106 ipmr_rules_fail:
3107         ipmr_notifier_exit(net);
3108 ipmr_notifier_fail:
3109         return err;
3110 }
3111
3112 static void __net_exit ipmr_net_exit(struct net *net)
3113 {
3114 #ifdef CONFIG_PROC_FS
3115         remove_proc_entry("ip_mr_cache", net->proc_net);
3116         remove_proc_entry("ip_mr_vif", net->proc_net);
3117 #endif
3118         ipmr_notifier_exit(net);
3119         ipmr_rules_exit(net);
3120 }
3121
3122 static struct pernet_operations ipmr_net_ops = {
3123         .init = ipmr_net_init,
3124         .exit = ipmr_net_exit,
3125 };
3126
3127 int __init ip_mr_init(void)
3128 {
3129         int err;
3130
3131         mrt_cachep = kmem_cache_create("ip_mrt_cache",
3132                                        sizeof(struct mfc_cache),
3133                                        0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
3134                                        NULL);
3135
3136         err = register_pernet_subsys(&ipmr_net_ops);
3137         if (err)
3138                 goto reg_pernet_fail;
3139
3140         err = register_netdevice_notifier(&ip_mr_notifier);
3141         if (err)
3142                 goto reg_notif_fail;
3143 #ifdef CONFIG_IP_PIMSM_V2
3144         if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
3145                 pr_err("%s: can't add PIM protocol\n", __func__);
3146                 err = -EAGAIN;
3147                 goto add_proto_fail;
3148         }
3149 #endif
3150         rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
3151                       ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
3152         rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
3153                       ipmr_rtm_route, NULL, 0);
3154         rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
3155                       ipmr_rtm_route, NULL, 0);
3156
3157         rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
3158                       NULL, ipmr_rtm_dumplink, 0);
3159         return 0;
3160
3161 #ifdef CONFIG_IP_PIMSM_V2
3162 add_proto_fail:
3163         unregister_netdevice_notifier(&ip_mr_notifier);
3164 #endif
3165 reg_notif_fail:
3166         unregister_pernet_subsys(&ipmr_net_ops);
3167 reg_pernet_fail:
3168         kmem_cache_destroy(mrt_cachep);
3169         return err;
3170 }