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                            struct netlink_ext_ack *extack)
 283 {
 284         return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack);
 285 }
 286
 287 static unsigned int ipmr_rules_seq_read(struct net *net)
 288 {
 289         return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);
 290 }
 291
 292 bool ipmr_rule_default(const struct fib_rule *rule)
 293 {
 294         return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
 295 }
 296 EXPORT_SYMBOL(ipmr_rule_default);
 297 #else
 298 #define ipmr_for_each_table(mrt, net) \
 299         for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
 300
 301 static struct mr_table *ipmr_mr_table_iter(struct net *net,
 302                                            struct mr_table *mrt)
 303 {
 304         if (!mrt)
 305                 return net->ipv4.mrt;
 306         return NULL;
 307 }
 308
 309 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
 310 {
 311         return net->ipv4.mrt;
 312 }
 313
 314 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
 315                            struct mr_table **mrt)
 316 {
 317         *mrt = net->ipv4.mrt;
 318         return 0;
 319 }
 320
 321 static int __net_init ipmr_rules_init(struct net *net)
 322 {
 323         struct mr_table *mrt;
 324
 325         mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
 326         if (IS_ERR(mrt))
 327                 return PTR_ERR(mrt);
 328         net->ipv4.mrt = mrt;
 329         return 0;
 330 }
 331
 332 static void __net_exit ipmr_rules_exit(struct net *net)
 333 {
 334         rtnl_lock();
 335         ipmr_free_table(net->ipv4.mrt);
 336         net->ipv4.mrt = NULL;
 337         rtnl_unlock();
 338 }
 339
 340 static int ipmr_rules_dump(struct net *net, struct notifier_block *nb,
 341                            struct netlink_ext_ack *extack)
 342 {
 343         return 0;
 344 }
 345
 346 static unsigned int ipmr_rules_seq_read(struct net *net)
 347 {
 348         return 0;
 349 }
 350
 351 bool ipmr_rule_default(const struct fib_rule *rule)
 352 {
 353         return true;
 354 }
 355 EXPORT_SYMBOL(ipmr_rule_default);
 356 #endif
 357
 358 static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
 359                                 const void *ptr)
 360 {
 361         const struct mfc_cache_cmp_arg *cmparg = arg->key;
 362         struct mfc_cache *c = (struct mfc_cache *)ptr;
 363
 364         return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
 365                cmparg->mfc_origin != c->mfc_origin;
 366 }
 367
 368 static const struct rhashtable_params ipmr_rht_params = {
 369         .head_offset = offsetof(struct mr_mfc, mnode),
 370         .key_offset = offsetof(struct mfc_cache, cmparg),
 371         .key_len = sizeof(struct mfc_cache_cmp_arg),
 372         .nelem_hint = 3,
 373         .obj_cmpfn = ipmr_hash_cmp,
 374         .automatic_shrinking = true,
 375 };
 376
 377 static void ipmr_new_table_set(struct mr_table *mrt,
 378                                struct net *net)
 379 {
 380 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
 381         list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
 382 #endif
 383 }
 384
 385 static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = {
 386         .mfc_mcastgrp = htonl(INADDR_ANY),
 387         .mfc_origin = htonl(INADDR_ANY),
 388 };
 389
 390 static struct mr_table_ops ipmr_mr_table_ops = {
 391         .rht_params = &ipmr_rht_params,
 392         .cmparg_any = &ipmr_mr_table_ops_cmparg_any,
 393 };
 394
 395 static struct mr_table *ipmr_new_table(struct net *net, u32 id)
 396 {
 397         struct mr_table *mrt;
 398
 399         /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
 400         if (id != RT_TABLE_DEFAULT && id >= 1000000000)
 401                 return ERR_PTR(-EINVAL);
 402
 403         mrt = ipmr_get_table(net, id);
 404         if (mrt)
 405                 return mrt;
 406
 407         return mr_table_alloc(net, id, &ipmr_mr_table_ops,
 408                               ipmr_expire_process, ipmr_new_table_set);
 409 }
 410
 411 static void ipmr_free_table(struct mr_table *mrt)
 412 {
 413         del_timer_sync(&mrt->ipmr_expire_timer);
 414         mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
 415                                  MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC);
 416         rhltable_destroy(&mrt->mfc_hash);
 417         kfree(mrt);
 418 }
 419
 420 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
 421
 422 static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
 423 {
 424         struct net *net = dev_net(dev);
 425
 426         dev_close(dev);
 427
 428         dev = __dev_get_by_name(net, "tunl0");
 429         if (dev) {
 430                 const struct net_device_ops *ops = dev->netdev_ops;
 431                 struct ifreq ifr;
 432                 struct ip_tunnel_parm p;
 433
 434                 memset(&p, 0, sizeof(p));
 435                 p.iph.daddr = v->vifc_rmt_addr.s_addr;
 436                 p.iph.saddr = v->vifc_lcl_addr.s_addr;
 437                 p.iph.version = 4;
 438                 p.iph.ihl = 5;
 439                 p.iph.protocol = IPPROTO_IPIP;
 440                 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
 441                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
 442
 443                 if (ops->ndo_do_ioctl) {
 444                         mm_segment_t oldfs = get_fs();
 445
 446                         set_fs(KERNEL_DS);
 447                         ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
 448                         set_fs(oldfs);
 449                 }
 450         }
 451 }
 452
 453 /* Initialize ipmr pimreg/tunnel in_device */
 454 static bool ipmr_init_vif_indev(const struct net_device *dev)
 455 {
 456         struct in_device *in_dev;
 457
 458         ASSERT_RTNL();
 459
 460         in_dev = __in_dev_get_rtnl(dev);
 461         if (!in_dev)
 462                 return false;
 463         ipv4_devconf_setall(in_dev);
 464         neigh_parms_data_state_setall(in_dev->arp_parms);
 465         IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
 466
 467         return true;
 468 }
 469
 470 static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
 471 {
 472         struct net_device  *dev;
 473
 474         dev = __dev_get_by_name(net, "tunl0");
 475
 476         if (dev) {
 477                 const struct net_device_ops *ops = dev->netdev_ops;
 478                 int err;
 479                 struct ifreq ifr;
 480                 struct ip_tunnel_parm p;
 481
 482                 memset(&p, 0, sizeof(p));
 483                 p.iph.daddr = v->vifc_rmt_addr.s_addr;
 484                 p.iph.saddr = v->vifc_lcl_addr.s_addr;
 485                 p.iph.version = 4;
 486                 p.iph.ihl = 5;
 487                 p.iph.protocol = IPPROTO_IPIP;
 488                 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
 489                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
 490
 491                 if (ops->ndo_do_ioctl) {
 492                         mm_segment_t oldfs = get_fs();
 493
 494                         set_fs(KERNEL_DS);
 495                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
 496                         set_fs(oldfs);
 497                 } else {
 498                         err = -EOPNOTSUPP;
 499                 }
 500                 dev = NULL;
 501
 502                 if (err == 0 &&
 503                     (dev = __dev_get_by_name(net, p.name)) != NULL) {
 504                         dev->flags |= IFF_MULTICAST;
 505                         if (!ipmr_init_vif_indev(dev))
 506                                 goto failure;
 507                         if (dev_open(dev, NULL))
 508                                 goto failure;
 509                         dev_hold(dev);
 510                 }
 511         }
 512         return dev;
 513
 514 failure:
 515         unregister_netdevice(dev);
 516         return NULL;
 517 }
 518
 519 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
 520 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
 521 {
 522         struct net *net = dev_net(dev);
 523         struct mr_table *mrt;
 524         struct flowi4 fl4 = {
 525                 .flowi4_oif     = dev->ifindex,
 526                 .flowi4_iif     = skb->skb_iif ? : LOOPBACK_IFINDEX,
 527                 .flowi4_mark    = skb->mark,
 528         };
 529         int err;
 530
 531         err = ipmr_fib_lookup(net, &fl4, &mrt);
 532         if (err < 0) {
 533                 kfree_skb(skb);
 534                 return err;
 535         }
 536
 537         read_lock(&mrt_lock);
 538         dev->stats.tx_bytes += skb->len;
 539         dev->stats.tx_packets++;
 540         ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
 541         read_unlock(&mrt_lock);
 542         kfree_skb(skb);
 543         return NETDEV_TX_OK;
 544 }
 545
 546 static int reg_vif_get_iflink(const struct net_device *dev)
 547 {
 548         return 0;
 549 }
 550
 551 static const struct net_device_ops reg_vif_netdev_ops = {
 552         .ndo_start_xmit = reg_vif_xmit,
 553         .ndo_get_iflink = reg_vif_get_iflink,
 554 };
 555
 556 static void reg_vif_setup(struct net_device *dev)
 557 {
 558         dev->type               = ARPHRD_PIMREG;
 559         dev->mtu                = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
 560         dev->flags              = IFF_NOARP;
 561         dev->netdev_ops         = &reg_vif_netdev_ops;
 562         dev->needs_free_netdev  = true;
 563         dev->features           |= NETIF_F_NETNS_LOCAL;
 564 }
 565
 566 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
 567 {
 568         struct net_device *dev;
 569         char name[IFNAMSIZ];
 570
 571         if (mrt->id == RT_TABLE_DEFAULT)
 572                 sprintf(name, "pimreg");
 573         else
 574                 sprintf(name, "pimreg%u", mrt->id);
 575
 576         dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
 577
 578         if (!dev)
 579                 return NULL;
 580
 581         dev_net_set(dev, net);
 582
 583         if (register_netdevice(dev)) {
 584                 free_netdev(dev);
 585                 return NULL;
 586         }
 587
 588         if (!ipmr_init_vif_indev(dev))
 589                 goto failure;
 590         if (dev_open(dev, NULL))
 591                 goto failure;
 592
 593         dev_hold(dev);
 594
 595         return dev;
 596
 597 failure:
 598         unregister_netdevice(dev);
 599         return NULL;
 600 }
 601
 602 /* called with rcu_read_lock() */
 603 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
 604                      unsigned int pimlen)
 605 {
 606         struct net_device *reg_dev = NULL;
 607         struct iphdr *encap;
 608
 609         encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
 610         /* Check that:
 611          * a. packet is really sent to a multicast group
 612          * b. packet is not a NULL-REGISTER
 613          * c. packet is not truncated
 614          */
 615         if (!ipv4_is_multicast(encap->daddr) ||
 616             encap->tot_len == 0 ||
 617             ntohs(encap->tot_len) + pimlen > skb->len)
 618                 return 1;
 619
 620         read_lock(&mrt_lock);
 621         if (mrt->mroute_reg_vif_num >= 0)
 622                 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
 623         read_unlock(&mrt_lock);
 624
 625         if (!reg_dev)
 626                 return 1;
 627
 628         skb->mac_header = skb->network_header;
 629         skb_pull(skb, (u8 *)encap - skb->data);
 630         skb_reset_network_header(skb);
 631         skb->protocol = htons(ETH_P_IP);
 632         skb->ip_summed = CHECKSUM_NONE;
 633
 634         skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
 635
 636         netif_rx(skb);
 637
 638         return NET_RX_SUCCESS;
 639 }
 640 #else
 641 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
 642 {
 643         return NULL;
 644 }
 645 #endif
 646
 647 static int call_ipmr_vif_entry_notifiers(struct net *net,
 648                                          enum fib_event_type event_type,
 649                                          struct vif_device *vif,
 650                                          vifi_t vif_index, u32 tb_id)
 651 {
 652         return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type,
 653                                      vif, vif_index, tb_id,
 654                                      &net->ipv4.ipmr_seq);
 655 }
 656
 657 static int call_ipmr_mfc_entry_notifiers(struct net *net,
 658                                          enum fib_event_type event_type,
 659                                          struct mfc_cache *mfc, u32 tb_id)
 660 {
 661         return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type,
 662                                      &mfc->_c, tb_id, &net->ipv4.ipmr_seq);
 663 }
 664
 665 /**
 666  *      vif_delete - Delete a VIF entry
 667  *      @notify: Set to 1, if the caller is a notifier_call
 668  */
 669 static int vif_delete(struct mr_table *mrt, int vifi, int notify,
 670                       struct list_head *head)
 671 {
 672         struct net *net = read_pnet(&mrt->net);
 673         struct vif_device *v;
 674         struct net_device *dev;
 675         struct in_device *in_dev;
 676
 677         if (vifi < 0 || vifi >= mrt->maxvif)
 678                 return -EADDRNOTAVAIL;
 679
 680         v = &mrt->vif_table[vifi];
 681
 682         if (VIF_EXISTS(mrt, vifi))
 683                 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, vifi,
 684                                               mrt->id);
 685
 686         write_lock_bh(&mrt_lock);
 687         dev = v->dev;
 688         v->dev = NULL;
 689
 690         if (!dev) {
 691                 write_unlock_bh(&mrt_lock);
 692                 return -EADDRNOTAVAIL;
 693         }
 694
 695         if (vifi == mrt->mroute_reg_vif_num)
 696                 mrt->mroute_reg_vif_num = -1;
 697
 698         if (vifi + 1 == mrt->maxvif) {
 699                 int tmp;
 700
 701                 for (tmp = vifi - 1; tmp >= 0; tmp--) {
 702                         if (VIF_EXISTS(mrt, tmp))
 703                                 break;
 704                 }
 705                 mrt->maxvif = tmp+1;
 706         }
 707
 708         write_unlock_bh(&mrt_lock);
 709
 710         dev_set_allmulti(dev, -1);
 711
 712         in_dev = __in_dev_get_rtnl(dev);
 713         if (in_dev) {
 714                 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
 715                 inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 716                                             NETCONFA_MC_FORWARDING,
 717                                             dev->ifindex, &in_dev->cnf);
 718                 ip_rt_multicast_event(in_dev);
 719         }
 720
 721         if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
 722                 unregister_netdevice_queue(dev, head);
 723
 724         dev_put(dev);
 725         return 0;
 726 }
 727
 728 static void ipmr_cache_free_rcu(struct rcu_head *head)
 729 {
 730         struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
 731
 732         kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
 733 }
 734
 735 static void ipmr_cache_free(struct mfc_cache *c)
 736 {
 737         call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
 738 }
 739
 740 /* Destroy an unresolved cache entry, killing queued skbs
 741  * and reporting error to netlink readers.
 742  */
 743 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
 744 {
 745         struct net *net = read_pnet(&mrt->net);
 746         struct sk_buff *skb;
 747         struct nlmsgerr *e;
 748
 749         atomic_dec(&mrt->cache_resolve_queue_len);
 750
 751         while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) {
 752                 if (ip_hdr(skb)->version == 0) {
 753                         struct nlmsghdr *nlh = skb_pull(skb,
 754                                                         sizeof(struct iphdr));
 755                         nlh->nlmsg_type = NLMSG_ERROR;
 756                         nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
 757                         skb_trim(skb, nlh->nlmsg_len);
 758                         e = nlmsg_data(nlh);
 759                         e->error = -ETIMEDOUT;
 760                         memset(&e->msg, 0, sizeof(e->msg));
 761
 762                         rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
 763                 } else {
 764                         kfree_skb(skb);
 765                 }
 766         }
 767
 768         ipmr_cache_free(c);
 769 }
 770
 771 /* Timer process for the unresolved queue. */
 772 static void ipmr_expire_process(struct timer_list *t)
 773 {
 774         struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
 775         struct mr_mfc *c, *next;
 776         unsigned long expires;
 777         unsigned long now;
 778
 779         if (!spin_trylock(&mfc_unres_lock)) {
 780                 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
 781                 return;
 782         }
 783
 784         if (list_empty(&mrt->mfc_unres_queue))
 785                 goto out;
 786
 787         now = jiffies;
 788         expires = 10*HZ;
 789
 790         list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
 791                 if (time_after(c->mfc_un.unres.expires, now)) {
 792                         unsigned long interval = c->mfc_un.unres.expires - now;
 793                         if (interval < expires)
 794                                 expires = interval;
 795                         continue;
 796                 }
 797
 798                 list_del(&c->list);
 799                 mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE);
 800                 ipmr_destroy_unres(mrt, (struct mfc_cache *)c);
 801         }
 802
 803         if (!list_empty(&mrt->mfc_unres_queue))
 804                 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
 805
 806 out:
 807         spin_unlock(&mfc_unres_lock);
 808 }
 809
 810 /* Fill oifs list. It is called under write locked mrt_lock. */
 811 static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache,
 812                                    unsigned char *ttls)
 813 {
 814         int vifi;
 815
 816         cache->mfc_un.res.minvif = MAXVIFS;
 817         cache->mfc_un.res.maxvif = 0;
 818         memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
 819
 820         for (vifi = 0; vifi < mrt->maxvif; vifi++) {
 821                 if (VIF_EXISTS(mrt, vifi) &&
 822                     ttls[vifi] && ttls[vifi] < 255) {
 823                         cache->mfc_un.res.ttls[vifi] = ttls[vifi];
 824                         if (cache->mfc_un.res.minvif > vifi)
 825                                 cache->mfc_un.res.minvif = vifi;
 826                         if (cache->mfc_un.res.maxvif <= vifi)
 827                                 cache->mfc_un.res.maxvif = vifi + 1;
 828                 }
 829         }
 830         cache->mfc_un.res.lastuse = jiffies;
 831 }
 832
 833 static int vif_add(struct net *net, struct mr_table *mrt,
 834                    struct vifctl *vifc, int mrtsock)
 835 {
 836         struct netdev_phys_item_id ppid = { };
 837         int vifi = vifc->vifc_vifi;
 838         struct vif_device *v = &mrt->vif_table[vifi];
 839         struct net_device *dev;
 840         struct in_device *in_dev;
 841         int err;
 842
 843         /* Is vif busy ? */
 844         if (VIF_EXISTS(mrt, vifi))
 845                 return -EADDRINUSE;
 846
 847         switch (vifc->vifc_flags) {
 848         case VIFF_REGISTER:
 849                 if (!ipmr_pimsm_enabled())
 850                         return -EINVAL;
 851                 /* Special Purpose VIF in PIM
 852                  * All the packets will be sent to the daemon
 853                  */
 854                 if (mrt->mroute_reg_vif_num >= 0)
 855                         return -EADDRINUSE;
 856                 dev = ipmr_reg_vif(net, mrt);
 857                 if (!dev)
 858                         return -ENOBUFS;
 859                 err = dev_set_allmulti(dev, 1);
 860                 if (err) {
 861                         unregister_netdevice(dev);
 862                         dev_put(dev);
 863                         return err;
 864                 }
 865                 break;
 866         case VIFF_TUNNEL:
 867                 dev = ipmr_new_tunnel(net, vifc);
 868                 if (!dev)
 869                         return -ENOBUFS;
 870                 err = dev_set_allmulti(dev, 1);
 871                 if (err) {
 872                         ipmr_del_tunnel(dev, vifc);
 873                         dev_put(dev);
 874                         return err;
 875                 }
 876                 break;
 877         case VIFF_USE_IFINDEX:
 878         case 0:
 879                 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
 880                         dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
 881                         if (dev && !__in_dev_get_rtnl(dev)) {
 882                                 dev_put(dev);
 883                                 return -EADDRNOTAVAIL;
 884                         }
 885                 } else {
 886                         dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
 887                 }
 888                 if (!dev)
 889                         return -EADDRNOTAVAIL;
 890                 err = dev_set_allmulti(dev, 1);
 891                 if (err) {
 892                         dev_put(dev);
 893                         return err;
 894                 }
 895                 break;
 896         default:
 897                 return -EINVAL;
 898         }
 899
 900         in_dev = __in_dev_get_rtnl(dev);
 901         if (!in_dev) {
 902                 dev_put(dev);
 903                 return -EADDRNOTAVAIL;
 904         }
 905         IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
 906         inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
 907                                     dev->ifindex, &in_dev->cnf);
 908         ip_rt_multicast_event(in_dev);
 909
 910         /* Fill in the VIF structures */
 911         vif_device_init(v, dev, vifc->vifc_rate_limit,
 912                         vifc->vifc_threshold,
 913                         vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
 914                         (VIFF_TUNNEL | VIFF_REGISTER));
 915
 916         err = dev_get_port_parent_id(dev, &ppid, true);
 917         if (err == 0) {
 918                 memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
 919                 v->dev_parent_id.id_len = ppid.id_len;
 920         } else {
 921                 v->dev_parent_id.id_len = 0;
 922         }
 923
 924         v->local = vifc->vifc_lcl_addr.s_addr;
 925         v->remote = vifc->vifc_rmt_addr.s_addr;
 926
 927         /* And finish update writing critical data */
 928         write_lock_bh(&mrt_lock);
 929         v->dev = dev;
 930         if (v->flags & VIFF_REGISTER)
 931                 mrt->mroute_reg_vif_num = vifi;
 932         if (vifi+1 > mrt->maxvif)
 933                 mrt->maxvif = vifi+1;
 934         write_unlock_bh(&mrt_lock);
 935         call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, vifi, mrt->id);
 936         return 0;
 937 }
 938
 939 /* called with rcu_read_lock() */
 940 static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
 941                                          __be32 origin,
 942                                          __be32 mcastgrp)
 943 {
 944         struct mfc_cache_cmp_arg arg = {
 945                         .mfc_mcastgrp = mcastgrp,
 946                         .mfc_origin = origin
 947         };
 948
 949         return mr_mfc_find(mrt, &arg);
 950 }
 951
 952 /* Look for a (*,G) entry */
 953 static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
 954                                              __be32 mcastgrp, int vifi)
 955 {
 956         struct mfc_cache_cmp_arg arg = {
 957                         .mfc_mcastgrp = mcastgrp,
 958                         .mfc_origin = htonl(INADDR_ANY)
 959         };
 960
 961         if (mcastgrp == htonl(INADDR_ANY))
 962                 return mr_mfc_find_any_parent(mrt, vifi);
 963         return mr_mfc_find_any(mrt, vifi, &arg);
 964 }
 965
 966 /* Look for a (S,G,iif) entry if parent != -1 */
 967 static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
 968                                                 __be32 origin, __be32 mcastgrp,
 969                                                 int parent)
 970 {
 971         struct mfc_cache_cmp_arg arg = {
 972                         .mfc_mcastgrp = mcastgrp,
 973                         .mfc_origin = origin,
 974         };
 975
 976         return mr_mfc_find_parent(mrt, &arg, parent);
 977 }
 978
 979 /* Allocate a multicast cache entry */
 980 static struct mfc_cache *ipmr_cache_alloc(void)
 981 {
 982         struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
 983
 984         if (c) {
 985                 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
 986                 c->_c.mfc_un.res.minvif = MAXVIFS;
 987                 c->_c.free = ipmr_cache_free_rcu;
 988                 refcount_set(&c->_c.mfc_un.res.refcount, 1);
 989         }
 990         return c;
 991 }
 992
 993 static struct mfc_cache *ipmr_cache_alloc_unres(void)
 994 {
 995         struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
 996
 997         if (c) {
 998                 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
 999                 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
1000         }
1001         return c;
1002 }
1003
1004 /* A cache entry has gone into a resolved state from queued */
1005 static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
1006                                struct mfc_cache *uc, struct mfc_cache *c)
1007 {
1008         struct sk_buff *skb;
1009         struct nlmsgerr *e;
1010
1011         /* Play the pending entries through our router */
1012         while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1013                 if (ip_hdr(skb)->version == 0) {
1014                         struct nlmsghdr *nlh = skb_pull(skb,
1015                                                         sizeof(struct iphdr));
1016
1017                         if (mr_fill_mroute(mrt, skb, &c->_c,
1018                                            nlmsg_data(nlh)) > 0) {
1019                                 nlh->nlmsg_len = skb_tail_pointer(skb) -
1020                                                  (u8 *)nlh;
1021                         } else {
1022                                 nlh->nlmsg_type = NLMSG_ERROR;
1023                                 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1024                                 skb_trim(skb, nlh->nlmsg_len);
1025                                 e = nlmsg_data(nlh);
1026                                 e->error = -EMSGSIZE;
1027                                 memset(&e->msg, 0, sizeof(e->msg));
1028                         }
1029
1030                         rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1031                 } else {
1032                         ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
1033                 }
1034         }
1035 }
1036
1037 /* Bounce a cache query up to mrouted and netlink.
1038  *
1039  * Called under mrt_lock.
1040  */
1041 static int ipmr_cache_report(struct mr_table *mrt,
1042                              struct sk_buff *pkt, vifi_t vifi, int assert)
1043 {
1044         const int ihl = ip_hdrlen(pkt);
1045         struct sock *mroute_sk;
1046         struct igmphdr *igmp;
1047         struct igmpmsg *msg;
1048         struct sk_buff *skb;
1049         int ret;
1050
1051         if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
1052                 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1053         else
1054                 skb = alloc_skb(128, GFP_ATOMIC);
1055
1056         if (!skb)
1057                 return -ENOBUFS;
1058
1059         if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
1060                 /* Ugly, but we have no choice with this interface.
1061                  * Duplicate old header, fix ihl, length etc.
1062                  * And all this only to mangle msg->im_msgtype and
1063                  * to set msg->im_mbz to "mbz" :-)
1064                  */
1065                 skb_push(skb, sizeof(struct iphdr));
1066                 skb_reset_network_header(skb);
1067                 skb_reset_transport_header(skb);
1068                 msg = (struct igmpmsg *)skb_network_header(skb);
1069                 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
1070                 msg->im_msgtype = assert;
1071                 msg->im_mbz = 0;
1072                 if (assert == IGMPMSG_WRVIFWHOLE)
1073                         msg->im_vif = vifi;
1074                 else
1075                         msg->im_vif = mrt->mroute_reg_vif_num;
1076                 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1077                 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1078                                              sizeof(struct iphdr));
1079         } else {
1080                 /* Copy the IP header */
1081                 skb_set_network_header(skb, skb->len);
1082                 skb_put(skb, ihl);
1083                 skb_copy_to_linear_data(skb, pkt->data, ihl);
1084                 /* Flag to the kernel this is a route add */
1085                 ip_hdr(skb)->protocol = 0;
1086                 msg = (struct igmpmsg *)skb_network_header(skb);
1087                 msg->im_vif = vifi;
1088                 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1089                 /* Add our header */
1090                 igmp = skb_put(skb, sizeof(struct igmphdr));
1091                 igmp->type = assert;
1092                 msg->im_msgtype = assert;
1093                 igmp->code = 0;
1094                 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1095                 skb->transport_header = skb->network_header;
1096         }
1097
1098         rcu_read_lock();
1099         mroute_sk = rcu_dereference(mrt->mroute_sk);
1100         if (!mroute_sk) {
1101                 rcu_read_unlock();
1102                 kfree_skb(skb);
1103                 return -EINVAL;
1104         }
1105
1106         igmpmsg_netlink_event(mrt, skb);
1107
1108         /* Deliver to mrouted */
1109         ret = sock_queue_rcv_skb(mroute_sk, skb);
1110         rcu_read_unlock();
1111         if (ret < 0) {
1112                 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1113                 kfree_skb(skb);
1114         }
1115
1116         return ret;
1117 }
1118
1119 /* Queue a packet for resolution. It gets locked cache entry! */
1120 static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
1121                                  struct sk_buff *skb, struct net_device *dev)
1122 {
1123         const struct iphdr *iph = ip_hdr(skb);
1124         struct mfc_cache *c;
1125         bool found = false;
1126         int err;
1127
1128         spin_lock_bh(&mfc_unres_lock);
1129         list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1130                 if (c->mfc_mcastgrp == iph->daddr &&
1131                     c->mfc_origin == iph->saddr) {
1132                         found = true;
1133                         break;
1134                 }
1135         }
1136
1137         if (!found) {
1138                 /* Create a new entry if allowable */
1139                 c = ipmr_cache_alloc_unres();
1140                 if (!c) {
1141                         spin_unlock_bh(&mfc_unres_lock);
1142
1143                         kfree_skb(skb);
1144                         return -ENOBUFS;
1145                 }
1146
1147                 /* Fill in the new cache entry */
1148                 c->_c.mfc_parent = -1;
1149                 c->mfc_origin   = iph->saddr;
1150                 c->mfc_mcastgrp = iph->daddr;
1151
1152                 /* Reflect first query at mrouted. */
1153                 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1154
1155                 if (err < 0) {
1156                         /* If the report failed throw the cache entry
1157                            out - Brad Parker
1158                          */
1159                         spin_unlock_bh(&mfc_unres_lock);
1160
1161                         ipmr_cache_free(c);
1162                         kfree_skb(skb);
1163                         return err;
1164                 }
1165
1166                 atomic_inc(&mrt->cache_resolve_queue_len);
1167                 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1168                 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1169
1170                 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1171                         mod_timer(&mrt->ipmr_expire_timer,
1172                                   c->_c.mfc_un.unres.expires);
1173         }
1174
1175         /* See if we can append the packet */
1176         if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1177                 kfree_skb(skb);
1178                 err = -ENOBUFS;
1179         } else {
1180                 if (dev) {
1181                         skb->dev = dev;
1182                         skb->skb_iif = dev->ifindex;
1183                 }
1184                 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1185                 err = 0;
1186         }
1187
1188         spin_unlock_bh(&mfc_unres_lock);
1189         return err;
1190 }
1191
1192 /* MFC cache manipulation by user space mroute daemon */
1193
1194 static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1195 {
1196         struct net *net = read_pnet(&mrt->net);
1197         struct mfc_cache *c;
1198
1199         /* The entries are added/deleted only under RTNL */
1200         rcu_read_lock();
1201         c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1202                                    mfc->mfcc_mcastgrp.s_addr, parent);
1203         rcu_read_unlock();
1204         if (!c)
1205                 return -ENOENT;
1206         rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
1207         list_del_rcu(&c->_c.list);
1208         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
1209         mroute_netlink_event(mrt, c, RTM_DELROUTE);
1210         mr_cache_put(&c->_c);
1211
1212         return 0;
1213 }
1214
1215 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1216                         struct mfcctl *mfc, int mrtsock, int parent)
1217 {
1218         struct mfc_cache *uc, *c;
1219         struct mr_mfc *_uc;
1220         bool found;
1221         int ret;
1222
1223         if (mfc->mfcc_parent >= MAXVIFS)
1224                 return -ENFILE;
1225
1226         /* The entries are added/deleted only under RTNL */
1227         rcu_read_lock();
1228         c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1229                                    mfc->mfcc_mcastgrp.s_addr, parent);
1230         rcu_read_unlock();
1231         if (c) {
1232                 write_lock_bh(&mrt_lock);
1233                 c->_c.mfc_parent = mfc->mfcc_parent;
1234                 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1235                 if (!mrtsock)
1236                         c->_c.mfc_flags |= MFC_STATIC;
1237                 write_unlock_bh(&mrt_lock);
1238                 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
1239                                               mrt->id);
1240                 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1241                 return 0;
1242         }
1243
1244         if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1245             !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1246                 return -EINVAL;
1247
1248         c = ipmr_cache_alloc();
1249         if (!c)
1250                 return -ENOMEM;
1251
1252         c->mfc_origin = mfc->mfcc_origin.s_addr;
1253         c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1254         c->_c.mfc_parent = mfc->mfcc_parent;
1255         ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1256         if (!mrtsock)
1257                 c->_c.mfc_flags |= MFC_STATIC;
1258
1259         ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1260                                   ipmr_rht_params);
1261         if (ret) {
1262                 pr_err("ipmr: rhtable insert error %d\n", ret);
1263                 ipmr_cache_free(c);
1264                 return ret;
1265         }
1266         list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1267         /* Check to see if we resolved a queued list. If so we
1268          * need to send on the frames and tidy up.
1269          */
1270         found = false;
1271         spin_lock_bh(&mfc_unres_lock);
1272         list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1273                 uc = (struct mfc_cache *)_uc;
1274                 if (uc->mfc_origin == c->mfc_origin &&
1275                     uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1276                         list_del(&_uc->list);
1277                         atomic_dec(&mrt->cache_resolve_queue_len);
1278                         found = true;
1279                         break;
1280                 }
1281         }
1282         if (list_empty(&mrt->mfc_unres_queue))
1283                 del_timer(&mrt->ipmr_expire_timer);
1284         spin_unlock_bh(&mfc_unres_lock);
1285
1286         if (found) {
1287                 ipmr_cache_resolve(net, mrt, uc, c);
1288                 ipmr_cache_free(uc);
1289         }
1290         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
1291         mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1292         return 0;
1293 }
1294
1295 /* Close the multicast socket, and clear the vif tables etc */
1296 static void mroute_clean_tables(struct mr_table *mrt, int flags)
1297 {
1298         struct net *net = read_pnet(&mrt->net);
1299         struct mr_mfc *c, *tmp;
1300         struct mfc_cache *cache;
1301         LIST_HEAD(list);
1302         int i;
1303
1304         /* Shut down all active vif entries */
1305         if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
1306                 for (i = 0; i < mrt->maxvif; i++) {
1307                         if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1308                              !(flags & MRT_FLUSH_VIFS_STATIC)) ||
1309                             (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
1310                                 continue;
1311                         vif_delete(mrt, i, 0, &list);
1312                 }
1313                 unregister_netdevice_many(&list);
1314         }
1315
1316         /* Wipe the cache */
1317         if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
1318                 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1319                         if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
1320                             (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
1321                                 continue;
1322                         rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1323                         list_del_rcu(&c->list);
1324                         cache = (struct mfc_cache *)c;
1325                         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
1326                                                       mrt->id);
1327                         mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1328                         mr_cache_put(c);
1329                 }
1330         }
1331
1332         if (flags & MRT_FLUSH_MFC) {
1333                 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1334                         spin_lock_bh(&mfc_unres_lock);
1335                         list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1336                                 list_del(&c->list);
1337                                 cache = (struct mfc_cache *)c;
1338                                 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1339                                 ipmr_destroy_unres(mrt, cache);
1340                         }
1341                         spin_unlock_bh(&mfc_unres_lock);
1342                 }
1343         }
1344 }
1345
1346 /* called from ip_ra_control(), before an RCU grace period,
1347  * we dont need to call synchronize_rcu() here
1348  */
1349 static void mrtsock_destruct(struct sock *sk)
1350 {
1351         struct net *net = sock_net(sk);
1352         struct mr_table *mrt;
1353
1354         rtnl_lock();
1355         ipmr_for_each_table(mrt, net) {
1356                 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1357                         IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1358                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1359                                                     NETCONFA_MC_FORWARDING,
1360                                                     NETCONFA_IFINDEX_ALL,
1361                                                     net->ipv4.devconf_all);
1362                         RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1363                         mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
1364                 }
1365         }
1366         rtnl_unlock();
1367 }
1368
1369 /* Socket options and virtual interface manipulation. The whole
1370  * virtual interface system is a complete heap, but unfortunately
1371  * that's how BSD mrouted happens to think. Maybe one day with a proper
1372  * MOSPF/PIM router set up we can clean this up.
1373  */
1374
1375 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
1376                          unsigned int optlen)
1377 {
1378         struct net *net = sock_net(sk);
1379         int val, ret = 0, parent = 0;
1380         struct mr_table *mrt;
1381         struct vifctl vif;
1382         struct mfcctl mfc;
1383         bool do_wrvifwhole;
1384         u32 uval;
1385
1386         /* There's one exception to the lock - MRT_DONE which needs to unlock */
1387         rtnl_lock();
1388         if (sk->sk_type != SOCK_RAW ||
1389             inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1390                 ret = -EOPNOTSUPP;
1391                 goto out_unlock;
1392         }
1393
1394         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1395         if (!mrt) {
1396                 ret = -ENOENT;
1397                 goto out_unlock;
1398         }
1399         if (optname != MRT_INIT) {
1400                 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1401                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1402                         ret = -EACCES;
1403                         goto out_unlock;
1404                 }
1405         }
1406
1407         switch (optname) {
1408         case MRT_INIT:
1409                 if (optlen != sizeof(int)) {
1410                         ret = -EINVAL;
1411                         break;
1412                 }
1413                 if (rtnl_dereference(mrt->mroute_sk)) {
1414                         ret = -EADDRINUSE;
1415                         break;
1416                 }
1417
1418                 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1419                 if (ret == 0) {
1420                         rcu_assign_pointer(mrt->mroute_sk, sk);
1421                         IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1422                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1423                                                     NETCONFA_MC_FORWARDING,
1424                                                     NETCONFA_IFINDEX_ALL,
1425                                                     net->ipv4.devconf_all);
1426                 }
1427                 break;
1428         case MRT_DONE:
1429                 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1430                         ret = -EACCES;
1431                 } else {
1432                         /* We need to unlock here because mrtsock_destruct takes
1433                          * care of rtnl itself and we can't change that due to
1434                          * the IP_ROUTER_ALERT setsockopt which runs without it.
1435                          */
1436                         rtnl_unlock();
1437                         ret = ip_ra_control(sk, 0, NULL);
1438                         goto out;
1439                 }
1440                 break;
1441         case MRT_ADD_VIF:
1442         case MRT_DEL_VIF:
1443                 if (optlen != sizeof(vif)) {
1444                         ret = -EINVAL;
1445                         break;
1446                 }
1447                 if (copy_from_user(&vif, optval, sizeof(vif))) {
1448                         ret = -EFAULT;
1449                         break;
1450                 }
1451                 if (vif.vifc_vifi >= MAXVIFS) {
1452                         ret = -ENFILE;
1453                         break;
1454                 }
1455                 if (optname == MRT_ADD_VIF) {
1456                         ret = vif_add(net, mrt, &vif,
1457                                       sk == rtnl_dereference(mrt->mroute_sk));
1458                 } else {
1459                         ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1460                 }
1461                 break;
1462         /* Manipulate the forwarding caches. These live
1463          * in a sort of kernel/user symbiosis.
1464          */
1465         case MRT_ADD_MFC:
1466         case MRT_DEL_MFC:
1467                 parent = -1;
1468                 fallthrough;
1469         case MRT_ADD_MFC_PROXY:
1470         case MRT_DEL_MFC_PROXY:
1471                 if (optlen != sizeof(mfc)) {
1472                         ret = -EINVAL;
1473                         break;
1474                 }
1475                 if (copy_from_user(&mfc, optval, sizeof(mfc))) {
1476                         ret = -EFAULT;
1477                         break;
1478                 }
1479                 if (parent == 0)
1480                         parent = mfc.mfcc_parent;
1481                 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1482                         ret = ipmr_mfc_delete(mrt, &mfc, parent);
1483                 else
1484                         ret = ipmr_mfc_add(net, mrt, &mfc,
1485                                            sk == rtnl_dereference(mrt->mroute_sk),
1486                                            parent);
1487                 break;
1488         case MRT_FLUSH:
1489                 if (optlen != sizeof(val)) {
1490                         ret = -EINVAL;
1491                         break;
1492                 }
1493                 if (get_user(val, (int __user *)optval)) {
1494                         ret = -EFAULT;
1495                         break;
1496                 }
1497                 mroute_clean_tables(mrt, val);
1498                 break;
1499         /* Control PIM assert. */
1500         case MRT_ASSERT:
1501                 if (optlen != sizeof(val)) {
1502                         ret = -EINVAL;
1503                         break;
1504                 }
1505                 if (get_user(val, (int __user *)optval)) {
1506                         ret = -EFAULT;
1507                         break;
1508                 }
1509                 mrt->mroute_do_assert = val;
1510                 break;
1511         case MRT_PIM:
1512                 if (!ipmr_pimsm_enabled()) {
1513                         ret = -ENOPROTOOPT;
1514                         break;
1515                 }
1516                 if (optlen != sizeof(val)) {
1517                         ret = -EINVAL;
1518                         break;
1519                 }
1520                 if (get_user(val, (int __user *)optval)) {
1521                         ret = -EFAULT;
1522                         break;
1523                 }
1524
1525                 do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
1526                 val = !!val;
1527                 if (val != mrt->mroute_do_pim) {
1528                         mrt->mroute_do_pim = val;
1529                         mrt->mroute_do_assert = val;
1530                         mrt->mroute_do_wrvifwhole = do_wrvifwhole;
1531                 }
1532                 break;
1533         case MRT_TABLE:
1534                 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1535                         ret = -ENOPROTOOPT;
1536                         break;
1537                 }
1538                 if (optlen != sizeof(uval)) {
1539                         ret = -EINVAL;
1540                         break;
1541                 }
1542                 if (get_user(uval, (u32 __user *)optval)) {
1543                         ret = -EFAULT;
1544                         break;
1545                 }
1546
1547                 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1548                         ret = -EBUSY;
1549                 } else {
1550                         mrt = ipmr_new_table(net, uval);
1551                         if (IS_ERR(mrt))
1552                                 ret = PTR_ERR(mrt);
1553                         else
1554                                 raw_sk(sk)->ipmr_table = uval;
1555                 }
1556                 break;
1557         /* Spurious command, or MRT_VERSION which you cannot set. */
1558         default:
1559                 ret = -ENOPROTOOPT;
1560         }
1561 out_unlock:
1562         rtnl_unlock();
1563 out:
1564         return ret;
1565 }
1566
1567 /* Getsock opt support for the multicast routing system. */
1568 int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1569 {
1570         int olr;
1571         int val;
1572         struct net *net = sock_net(sk);
1573         struct mr_table *mrt;
1574
1575         if (sk->sk_type != SOCK_RAW ||
1576             inet_sk(sk)->inet_num != IPPROTO_IGMP)
1577                 return -EOPNOTSUPP;
1578
1579         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1580         if (!mrt)
1581                 return -ENOENT;
1582
1583         switch (optname) {
1584         case MRT_VERSION:
1585                 val = 0x0305;
1586                 break;
1587         case MRT_PIM:
1588                 if (!ipmr_pimsm_enabled())
1589                         return -ENOPROTOOPT;
1590                 val = mrt->mroute_do_pim;
1591                 break;
1592         case MRT_ASSERT:
1593                 val = mrt->mroute_do_assert;
1594                 break;
1595         default:
1596                 return -ENOPROTOOPT;
1597         }
1598
1599         if (get_user(olr, optlen))
1600                 return -EFAULT;
1601         olr = min_t(unsigned int, olr, sizeof(int));
1602         if (olr < 0)
1603                 return -EINVAL;
1604         if (put_user(olr, optlen))
1605                 return -EFAULT;
1606         if (copy_to_user(optval, &val, olr))
1607                 return -EFAULT;
1608         return 0;
1609 }
1610
1611 /* The IP multicast ioctl support routines. */
1612 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1613 {
1614         struct sioc_sg_req sr;
1615         struct sioc_vif_req vr;
1616         struct vif_device *vif;
1617         struct mfc_cache *c;
1618         struct net *net = sock_net(sk);
1619         struct mr_table *mrt;
1620
1621         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1622         if (!mrt)
1623                 return -ENOENT;
1624
1625         switch (cmd) {
1626         case SIOCGETVIFCNT:
1627                 if (copy_from_user(&vr, arg, sizeof(vr)))
1628                         return -EFAULT;
1629                 if (vr.vifi >= mrt->maxvif)
1630                         return -EINVAL;
1631                 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1632                 read_lock(&mrt_lock);
1633                 vif = &mrt->vif_table[vr.vifi];
1634                 if (VIF_EXISTS(mrt, vr.vifi)) {
1635                         vr.icount = vif->pkt_in;
1636                         vr.ocount = vif->pkt_out;
1637                         vr.ibytes = vif->bytes_in;
1638                         vr.obytes = vif->bytes_out;
1639                         read_unlock(&mrt_lock);
1640
1641                         if (copy_to_user(arg, &vr, sizeof(vr)))
1642                                 return -EFAULT;
1643                         return 0;
1644                 }
1645                 read_unlock(&mrt_lock);
1646                 return -EADDRNOTAVAIL;
1647         case SIOCGETSGCNT:
1648                 if (copy_from_user(&sr, arg, sizeof(sr)))
1649                         return -EFAULT;
1650
1651                 rcu_read_lock();
1652                 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1653                 if (c) {
1654                         sr.pktcnt = c->_c.mfc_un.res.pkt;
1655                         sr.bytecnt = c->_c.mfc_un.res.bytes;
1656                         sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1657                         rcu_read_unlock();
1658
1659                         if (copy_to_user(arg, &sr, sizeof(sr)))
1660                                 return -EFAULT;
1661                         return 0;
1662                 }
1663                 rcu_read_unlock();
1664                 return -EADDRNOTAVAIL;
1665         default:
1666                 return -ENOIOCTLCMD;
1667         }
1668 }
1669
1670 #ifdef CONFIG_COMPAT
1671 struct compat_sioc_sg_req {
1672         struct in_addr src;
1673         struct in_addr grp;
1674         compat_ulong_t pktcnt;
1675         compat_ulong_t bytecnt;
1676         compat_ulong_t wrong_if;
1677 };
1678
1679 struct compat_sioc_vif_req {
1680         vifi_t  vifi;           /* Which iface */
1681         compat_ulong_t icount;
1682         compat_ulong_t ocount;
1683         compat_ulong_t ibytes;
1684         compat_ulong_t obytes;
1685 };
1686
1687 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1688 {
1689         struct compat_sioc_sg_req sr;
1690         struct compat_sioc_vif_req vr;
1691         struct vif_device *vif;
1692         struct mfc_cache *c;
1693         struct net *net = sock_net(sk);
1694         struct mr_table *mrt;
1695
1696         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1697         if (!mrt)
1698                 return -ENOENT;
1699
1700         switch (cmd) {
1701         case SIOCGETVIFCNT:
1702                 if (copy_from_user(&vr, arg, sizeof(vr)))
1703                         return -EFAULT;
1704                 if (vr.vifi >= mrt->maxvif)
1705                         return -EINVAL;
1706                 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1707                 read_lock(&mrt_lock);
1708                 vif = &mrt->vif_table[vr.vifi];
1709                 if (VIF_EXISTS(mrt, vr.vifi)) {
1710                         vr.icount = vif->pkt_in;
1711                         vr.ocount = vif->pkt_out;
1712                         vr.ibytes = vif->bytes_in;
1713                         vr.obytes = vif->bytes_out;
1714                         read_unlock(&mrt_lock);
1715
1716                         if (copy_to_user(arg, &vr, sizeof(vr)))
1717                                 return -EFAULT;
1718                         return 0;
1719                 }
1720                 read_unlock(&mrt_lock);
1721                 return -EADDRNOTAVAIL;
1722         case SIOCGETSGCNT:
1723                 if (copy_from_user(&sr, arg, sizeof(sr)))
1724                         return -EFAULT;
1725
1726                 rcu_read_lock();
1727                 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1728                 if (c) {
1729                         sr.pktcnt = c->_c.mfc_un.res.pkt;
1730                         sr.bytecnt = c->_c.mfc_un.res.bytes;
1731                         sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1732                         rcu_read_unlock();
1733
1734                         if (copy_to_user(arg, &sr, sizeof(sr)))
1735                                 return -EFAULT;
1736                         return 0;
1737                 }
1738                 rcu_read_unlock();
1739                 return -EADDRNOTAVAIL;
1740         default:
1741                 return -ENOIOCTLCMD;
1742         }
1743 }
1744 #endif
1745
1746 static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1747 {
1748         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1749         struct net *net = dev_net(dev);
1750         struct mr_table *mrt;
1751         struct vif_device *v;
1752         int ct;
1753
1754         if (event != NETDEV_UNREGISTER)
1755                 return NOTIFY_DONE;
1756
1757         ipmr_for_each_table(mrt, net) {
1758                 v = &mrt->vif_table[0];
1759                 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1760                         if (v->dev == dev)
1761                                 vif_delete(mrt, ct, 1, NULL);
1762                 }
1763         }
1764         return NOTIFY_DONE;
1765 }
1766
1767 static struct notifier_block ip_mr_notifier = {
1768         .notifier_call = ipmr_device_event,
1769 };
1770
1771 /* Encapsulate a packet by attaching a valid IPIP header to it.
1772  * This avoids tunnel drivers and other mess and gives us the speed so
1773  * important for multicast video.
1774  */
1775 static void ip_encap(struct net *net, struct sk_buff *skb,
1776                      __be32 saddr, __be32 daddr)
1777 {
1778         struct iphdr *iph;
1779         const struct iphdr *old_iph = ip_hdr(skb);
1780
1781         skb_push(skb, sizeof(struct iphdr));
1782         skb->transport_header = skb->network_header;
1783         skb_reset_network_header(skb);
1784         iph = ip_hdr(skb);
1785
1786         iph->version    =       4;
1787         iph->tos        =       old_iph->tos;
1788         iph->ttl        =       old_iph->ttl;
1789         iph->frag_off   =       0;
1790         iph->daddr      =       daddr;
1791         iph->saddr      =       saddr;
1792         iph->protocol   =       IPPROTO_IPIP;
1793         iph->ihl        =       5;
1794         iph->tot_len    =       htons(skb->len);
1795         ip_select_ident(net, skb, NULL);
1796         ip_send_check(iph);
1797
1798         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1799         nf_reset_ct(skb);
1800 }
1801
1802 static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1803                                       struct sk_buff *skb)
1804 {
1805         struct ip_options *opt = &(IPCB(skb)->opt);
1806
1807         IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1808         IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1809
1810         if (unlikely(opt->optlen))
1811                 ip_forward_options(skb);
1812
1813         return dst_output(net, sk, skb);
1814 }
1815
1816 #ifdef CONFIG_NET_SWITCHDEV
1817 static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1818                                    int in_vifi, int out_vifi)
1819 {
1820         struct vif_device *out_vif = &mrt->vif_table[out_vifi];
1821         struct vif_device *in_vif = &mrt->vif_table[in_vifi];
1822
1823         if (!skb->offload_l3_fwd_mark)
1824                 return false;
1825         if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
1826                 return false;
1827         return netdev_phys_item_id_same(&out_vif->dev_parent_id,
1828                                         &in_vif->dev_parent_id);
1829 }
1830 #else
1831 static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1832                                    int in_vifi, int out_vifi)
1833 {
1834         return false;
1835 }
1836 #endif
1837
1838 /* Processing handlers for ipmr_forward */
1839
1840 static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1841                             int in_vifi, struct sk_buff *skb, int vifi)
1842 {
1843         const struct iphdr *iph = ip_hdr(skb);
1844         struct vif_device *vif = &mrt->vif_table[vifi];
1845         struct net_device *dev;
1846         struct rtable *rt;
1847         struct flowi4 fl4;
1848         int    encap = 0;
1849
1850         if (!vif->dev)
1851                 goto out_free;
1852
1853         if (vif->flags & VIFF_REGISTER) {
1854                 vif->pkt_out++;
1855                 vif->bytes_out += skb->len;
1856                 vif->dev->stats.tx_bytes += skb->len;
1857                 vif->dev->stats.tx_packets++;
1858                 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1859                 goto out_free;
1860         }
1861
1862         if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
1863                 goto out_free;
1864
1865         if (vif->flags & VIFF_TUNNEL) {
1866                 rt = ip_route_output_ports(net, &fl4, NULL,
1867                                            vif->remote, vif->local,
1868                                            0, 0,
1869                                            IPPROTO_IPIP,
1870                                            RT_TOS(iph->tos), vif->link);
1871                 if (IS_ERR(rt))
1872                         goto out_free;
1873                 encap = sizeof(struct iphdr);
1874         } else {
1875                 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1876                                            0, 0,
1877                                            IPPROTO_IPIP,
1878                                            RT_TOS(iph->tos), vif->link);
1879                 if (IS_ERR(rt))
1880                         goto out_free;
1881         }
1882
1883         dev = rt->dst.dev;
1884
1885         if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1886                 /* Do not fragment multicasts. Alas, IPv4 does not
1887                  * allow to send ICMP, so that packets will disappear
1888                  * to blackhole.
1889                  */
1890                 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1891                 ip_rt_put(rt);
1892                 goto out_free;
1893         }
1894
1895         encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1896
1897         if (skb_cow(skb, encap)) {
1898                 ip_rt_put(rt);
1899                 goto out_free;
1900         }
1901
1902         vif->pkt_out++;
1903         vif->bytes_out += skb->len;
1904
1905         skb_dst_drop(skb);
1906         skb_dst_set(skb, &rt->dst);
1907         ip_decrease_ttl(ip_hdr(skb));
1908
1909         /* FIXME: forward and output firewalls used to be called here.
1910          * What do we do with netfilter? -- RR
1911          */
1912         if (vif->flags & VIFF_TUNNEL) {
1913                 ip_encap(net, skb, vif->local, vif->remote);
1914                 /* FIXME: extra output firewall step used to be here. --RR */
1915                 vif->dev->stats.tx_packets++;
1916                 vif->dev->stats.tx_bytes += skb->len;
1917         }
1918
1919         IPCB(skb)->flags |= IPSKB_FORWARDED;
1920
1921         /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1922          * not only before forwarding, but after forwarding on all output
1923          * interfaces. It is clear, if mrouter runs a multicasting
1924          * program, it should receive packets not depending to what interface
1925          * program is joined.
1926          * If we will not make it, the program will have to join on all
1927          * interfaces. On the other hand, multihoming host (or router, but
1928          * not mrouter) cannot join to more than one interface - it will
1929          * result in receiving multiple packets.
1930          */
1931         NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1932                 net, NULL, skb, skb->dev, dev,
1933                 ipmr_forward_finish);
1934         return;
1935
1936 out_free:
1937         kfree_skb(skb);
1938 }
1939
1940 static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1941 {
1942         int ct;
1943
1944         for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1945                 if (mrt->vif_table[ct].dev == dev)
1946                         break;
1947         }
1948         return ct;
1949 }
1950
1951 /* "local" means that we should preserve one skb (for local delivery) */
1952 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
1953                           struct net_device *dev, struct sk_buff *skb,
1954                           struct mfc_cache *c, int local)
1955 {
1956         int true_vifi = ipmr_find_vif(mrt, dev);
1957         int psend = -1;
1958         int vif, ct;
1959
1960         vif = c->_c.mfc_parent;
1961         c->_c.mfc_un.res.pkt++;
1962         c->_c.mfc_un.res.bytes += skb->len;
1963         c->_c.mfc_un.res.lastuse = jiffies;
1964
1965         if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1966                 struct mfc_cache *cache_proxy;
1967
1968                 /* For an (*,G) entry, we only check that the incomming
1969                  * interface is part of the static tree.
1970                  */
1971                 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
1972                 if (cache_proxy &&
1973                     cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
1974                         goto forward;
1975         }
1976
1977         /* Wrong interface: drop packet and (maybe) send PIM assert. */
1978         if (mrt->vif_table[vif].dev != dev) {
1979                 if (rt_is_output_route(skb_rtable(skb))) {
1980                         /* It is our own packet, looped back.
1981                          * Very complicated situation...
1982                          *
1983                          * The best workaround until routing daemons will be
1984                          * fixed is not to redistribute packet, if it was
1985                          * send through wrong interface. It means, that
1986                          * multicast applications WILL NOT work for
1987                          * (S,G), which have default multicast route pointing
1988                          * to wrong oif. In any case, it is not a good
1989                          * idea to use multicasting applications on router.
1990                          */
1991                         goto dont_forward;
1992                 }
1993
1994                 c->_c.mfc_un.res.wrong_if++;
1995
1996                 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1997                     /* pimsm uses asserts, when switching from RPT to SPT,
1998                      * so that we cannot check that packet arrived on an oif.
1999                      * It is bad, but otherwise we would need to move pretty
2000                      * large chunk of pimd to kernel. Ough... --ANK
2001                      */
2002                     (mrt->mroute_do_pim ||
2003                      c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2004                     time_after(jiffies,
2005                                c->_c.mfc_un.res.last_assert +
2006                                MFC_ASSERT_THRESH)) {
2007                         c->_c.mfc_un.res.last_assert = jiffies;
2008                         ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
2009                         if (mrt->mroute_do_wrvifwhole)
2010                                 ipmr_cache_report(mrt, skb, true_vifi,
2011                                                   IGMPMSG_WRVIFWHOLE);
2012                 }
2013                 goto dont_forward;
2014         }
2015
2016 forward:
2017         mrt->vif_table[vif].pkt_in++;
2018         mrt->vif_table[vif].bytes_in += skb->len;
2019
2020         /* Forward the frame */
2021         if (c->mfc_origin == htonl(INADDR_ANY) &&
2022             c->mfc_mcastgrp == htonl(INADDR_ANY)) {
2023                 if (true_vifi >= 0 &&
2024                     true_vifi != c->_c.mfc_parent &&
2025                     ip_hdr(skb)->ttl >
2026                                 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2027                         /* It's an (*,*) entry and the packet is not coming from
2028                          * the upstream: forward the packet to the upstream
2029                          * only.
2030                          */
2031                         psend = c->_c.mfc_parent;
2032                         goto last_forward;
2033                 }
2034                 goto dont_forward;
2035         }
2036         for (ct = c->_c.mfc_un.res.maxvif - 1;
2037              ct >= c->_c.mfc_un.res.minvif; ct--) {
2038                 /* For (*,G) entry, don't forward to the incoming interface */
2039                 if ((c->mfc_origin != htonl(INADDR_ANY) ||
2040                      ct != true_vifi) &&
2041                     ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
2042                         if (psend != -1) {
2043                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2044
2045                                 if (skb2)
2046                                         ipmr_queue_xmit(net, mrt, true_vifi,
2047                                                         skb2, psend);
2048                         }
2049                         psend = ct;
2050                 }
2051         }
2052 last_forward:
2053         if (psend != -1) {
2054                 if (local) {
2055                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2056
2057                         if (skb2)
2058                                 ipmr_queue_xmit(net, mrt, true_vifi, skb2,
2059                                                 psend);
2060                 } else {
2061                         ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
2062                         return;
2063                 }
2064         }
2065
2066 dont_forward:
2067         if (!local)
2068                 kfree_skb(skb);
2069 }
2070
2071 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
2072 {
2073         struct rtable *rt = skb_rtable(skb);
2074         struct iphdr *iph = ip_hdr(skb);
2075         struct flowi4 fl4 = {
2076                 .daddr = iph->daddr,
2077                 .saddr = iph->saddr,
2078                 .flowi4_tos = RT_TOS(iph->tos),
2079                 .flowi4_oif = (rt_is_output_route(rt) ?
2080                                skb->dev->ifindex : 0),
2081                 .flowi4_iif = (rt_is_output_route(rt) ?
2082                                LOOPBACK_IFINDEX :
2083                                skb->dev->ifindex),
2084                 .flowi4_mark = skb->mark,
2085         };
2086         struct mr_table *mrt;
2087         int err;
2088
2089         err = ipmr_fib_lookup(net, &fl4, &mrt);
2090         if (err)
2091                 return ERR_PTR(err);
2092         return mrt;
2093 }
2094
2095 /* Multicast packets for forwarding arrive here
2096  * Called with rcu_read_lock();
2097  */
2098 int ip_mr_input(struct sk_buff *skb)
2099 {
2100         struct mfc_cache *cache;
2101         struct net *net = dev_net(skb->dev);
2102         int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
2103         struct mr_table *mrt;
2104         struct net_device *dev;
2105
2106         /* skb->dev passed in is the loX master dev for vrfs.
2107          * As there are no vifs associated with loopback devices,
2108          * get the proper interface that does have a vif associated with it.
2109          */
2110         dev = skb->dev;
2111         if (netif_is_l3_master(skb->dev)) {
2112                 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2113                 if (!dev) {
2114                         kfree_skb(skb);
2115                         return -ENODEV;
2116                 }
2117         }
2118
2119         /* Packet is looped back after forward, it should not be
2120          * forwarded second time, but still can be delivered locally.
2121          */
2122         if (IPCB(skb)->flags & IPSKB_FORWARDED)
2123                 goto dont_forward;
2124
2125         mrt = ipmr_rt_fib_lookup(net, skb);
2126         if (IS_ERR(mrt)) {
2127                 kfree_skb(skb);
2128                 return PTR_ERR(mrt);
2129         }
2130         if (!local) {
2131                 if (IPCB(skb)->opt.router_alert) {
2132                         if (ip_call_ra_chain(skb))
2133                                 return 0;
2134                 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2135                         /* IGMPv1 (and broken IGMPv2 implementations sort of
2136                          * Cisco IOS <= 11.2(8)) do not put router alert
2137                          * option to IGMP packets destined to routable
2138                          * groups. It is very bad, because it means
2139                          * that we can forward NO IGMP messages.
2140                          */
2141                         struct sock *mroute_sk;
2142
2143                         mroute_sk = rcu_dereference(mrt->mroute_sk);
2144                         if (mroute_sk) {
2145                                 nf_reset_ct(skb);
2146                                 raw_rcv(mroute_sk, skb);
2147                                 return 0;
2148                         }
2149                     }
2150         }
2151
2152         /* already under rcu_read_lock() */
2153         cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
2154         if (!cache) {
2155                 int vif = ipmr_find_vif(mrt, dev);
2156
2157                 if (vif >= 0)
2158                         cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2159                                                     vif);
2160         }
2161
2162         /* No usable cache entry */
2163         if (!cache) {
2164                 int vif;
2165
2166                 if (local) {
2167                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2168                         ip_local_deliver(skb);
2169                         if (!skb2)
2170                                 return -ENOBUFS;
2171                         skb = skb2;
2172                 }
2173
2174                 read_lock(&mrt_lock);
2175                 vif = ipmr_find_vif(mrt, dev);
2176                 if (vif >= 0) {
2177                         int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev);
2178                         read_unlock(&mrt_lock);
2179
2180                         return err2;
2181                 }
2182                 read_unlock(&mrt_lock);
2183                 kfree_skb(skb);
2184                 return -ENODEV;
2185         }
2186
2187         read_lock(&mrt_lock);
2188         ip_mr_forward(net, mrt, dev, skb, cache, local);
2189         read_unlock(&mrt_lock);
2190
2191         if (local)
2192                 return ip_local_deliver(skb);
2193
2194         return 0;
2195
2196 dont_forward:
2197         if (local)
2198                 return ip_local_deliver(skb);
2199         kfree_skb(skb);
2200         return 0;
2201 }
2202
2203 #ifdef CONFIG_IP_PIMSM_V1
2204 /* Handle IGMP messages of PIMv1 */
2205 int pim_rcv_v1(struct sk_buff *skb)
2206 {
2207         struct igmphdr *pim;
2208         struct net *net = dev_net(skb->dev);
2209         struct mr_table *mrt;
2210
2211         if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2212                 goto drop;
2213
2214         pim = igmp_hdr(skb);
2215
2216         mrt = ipmr_rt_fib_lookup(net, skb);
2217         if (IS_ERR(mrt))
2218                 goto drop;
2219         if (!mrt->mroute_do_pim ||
2220             pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2221                 goto drop;
2222
2223         if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2224 drop:
2225                 kfree_skb(skb);
2226         }
2227         return 0;
2228 }
2229 #endif
2230
2231 #ifdef CONFIG_IP_PIMSM_V2
2232 static int pim_rcv(struct sk_buff *skb)
2233 {
2234         struct pimreghdr *pim;
2235         struct net *net = dev_net(skb->dev);
2236         struct mr_table *mrt;
2237
2238         if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2239                 goto drop;
2240
2241         pim = (struct pimreghdr *)skb_transport_header(skb);
2242         if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
2243             (pim->flags & PIM_NULL_REGISTER) ||
2244             (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2245              csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2246                 goto drop;
2247
2248         mrt = ipmr_rt_fib_lookup(net, skb);
2249         if (IS_ERR(mrt))
2250                 goto drop;
2251         if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2252 drop:
2253                 kfree_skb(skb);
2254         }
2255         return 0;
2256 }
2257 #endif
2258
2259 int ipmr_get_route(struct net *net, struct sk_buff *skb,
2260                    __be32 saddr, __be32 daddr,
2261                    struct rtmsg *rtm, u32 portid)
2262 {
2263         struct mfc_cache *cache;
2264         struct mr_table *mrt;
2265         int err;
2266
2267         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2268         if (!mrt)
2269                 return -ENOENT;
2270
2271         rcu_read_lock();
2272         cache = ipmr_cache_find(mrt, saddr, daddr);
2273         if (!cache && skb->dev) {
2274                 int vif = ipmr_find_vif(mrt, skb->dev);
2275
2276                 if (vif >= 0)
2277                         cache = ipmr_cache_find_any(mrt, daddr, vif);
2278         }
2279         if (!cache) {
2280                 struct sk_buff *skb2;
2281                 struct iphdr *iph;
2282                 struct net_device *dev;
2283                 int vif = -1;
2284
2285                 dev = skb->dev;
2286                 read_lock(&mrt_lock);
2287                 if (dev)
2288                         vif = ipmr_find_vif(mrt, dev);
2289                 if (vif < 0) {
2290                         read_unlock(&mrt_lock);
2291                         rcu_read_unlock();
2292                         return -ENODEV;
2293                 }
2294
2295                 skb2 = skb_realloc_headroom(skb, sizeof(struct iphdr));
2296                 if (!skb2) {
2297                         read_unlock(&mrt_lock);
2298                         rcu_read_unlock();
2299                         return -ENOMEM;
2300                 }
2301
2302                 NETLINK_CB(skb2).portid = portid;
2303                 skb_push(skb2, sizeof(struct iphdr));
2304                 skb_reset_network_header(skb2);
2305                 iph = ip_hdr(skb2);
2306                 iph->ihl = sizeof(struct iphdr) >> 2;
2307                 iph->saddr = saddr;
2308                 iph->daddr = daddr;
2309                 iph->version = 0;
2310                 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
2311                 read_unlock(&mrt_lock);
2312                 rcu_read_unlock();
2313                 return err;
2314         }
2315
2316         read_lock(&mrt_lock);
2317         err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2318         read_unlock(&mrt_lock);
2319         rcu_read_unlock();
2320         return err;
2321 }
2322
2323 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2324                             u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2325                             int flags)
2326 {
2327         struct nlmsghdr *nlh;
2328         struct rtmsg *rtm;
2329         int err;
2330
2331         nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2332         if (!nlh)
2333                 return -EMSGSIZE;
2334
2335         rtm = nlmsg_data(nlh);
2336         rtm->rtm_family   = RTNL_FAMILY_IPMR;
2337         rtm->rtm_dst_len  = 32;
2338         rtm->rtm_src_len  = 32;
2339         rtm->rtm_tos      = 0;
2340         rtm->rtm_table    = mrt->id;
2341         if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2342                 goto nla_put_failure;
2343         rtm->rtm_type     = RTN_MULTICAST;
2344         rtm->rtm_scope    = RT_SCOPE_UNIVERSE;
2345         if (c->_c.mfc_flags & MFC_STATIC)
2346                 rtm->rtm_protocol = RTPROT_STATIC;
2347         else
2348                 rtm->rtm_protocol = RTPROT_MROUTED;
2349         rtm->rtm_flags    = 0;
2350
2351         if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2352             nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
2353                 goto nla_put_failure;
2354         err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2355         /* do not break the dump if cache is unresolved */
2356         if (err < 0 && err != -ENOENT)
2357                 goto nla_put_failure;
2358
2359         nlmsg_end(skb, nlh);
2360         return 0;
2361
2362 nla_put_failure:
2363         nlmsg_cancel(skb, nlh);
2364         return -EMSGSIZE;
2365 }
2366
2367 static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2368                              u32 portid, u32 seq, struct mr_mfc *c, int cmd,
2369                              int flags)
2370 {
2371         return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
2372                                 cmd, flags);
2373 }
2374
2375 static size_t mroute_msgsize(bool unresolved, int maxvif)
2376 {
2377         size_t len =
2378                 NLMSG_ALIGN(sizeof(struct rtmsg))
2379                 + nla_total_size(4)     /* RTA_TABLE */
2380                 + nla_total_size(4)     /* RTA_SRC */
2381                 + nla_total_size(4)     /* RTA_DST */
2382                 ;
2383
2384         if (!unresolved)
2385                 len = len
2386                       + nla_total_size(4)       /* RTA_IIF */
2387                       + nla_total_size(0)       /* RTA_MULTIPATH */
2388                       + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2389                                                 /* RTA_MFC_STATS */
2390                       + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2391                 ;
2392
2393         return len;
2394 }
2395
2396 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2397                                  int cmd)
2398 {
2399         struct net *net = read_pnet(&mrt->net);
2400         struct sk_buff *skb;
2401         int err = -ENOBUFS;
2402
2403         skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
2404                                        mrt->maxvif),
2405                         GFP_ATOMIC);
2406         if (!skb)
2407                 goto errout;
2408
2409         err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2410         if (err < 0)
2411                 goto errout;
2412
2413         rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2414         return;
2415
2416 errout:
2417         kfree_skb(skb);
2418         if (err < 0)
2419                 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2420 }
2421
2422 static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2423 {
2424         size_t len =
2425                 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2426                 + nla_total_size(1)     /* IPMRA_CREPORT_MSGTYPE */
2427                 + nla_total_size(4)     /* IPMRA_CREPORT_VIF_ID */
2428                 + nla_total_size(4)     /* IPMRA_CREPORT_SRC_ADDR */
2429                 + nla_total_size(4)     /* IPMRA_CREPORT_DST_ADDR */
2430                                         /* IPMRA_CREPORT_PKT */
2431                 + nla_total_size(payloadlen)
2432                 ;
2433
2434         return len;
2435 }
2436
2437 static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2438 {
2439         struct net *net = read_pnet(&mrt->net);
2440         struct nlmsghdr *nlh;
2441         struct rtgenmsg *rtgenm;
2442         struct igmpmsg *msg;
2443         struct sk_buff *skb;
2444         struct nlattr *nla;
2445         int payloadlen;
2446
2447         payloadlen = pkt->len - sizeof(struct igmpmsg);
2448         msg = (struct igmpmsg *)skb_network_header(pkt);
2449
2450         skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2451         if (!skb)
2452                 goto errout;
2453
2454         nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2455                         sizeof(struct rtgenmsg), 0);
2456         if (!nlh)
2457                 goto errout;
2458         rtgenm = nlmsg_data(nlh);
2459         rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2460         if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
2461             nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) ||
2462             nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2463                             msg->im_src.s_addr) ||
2464             nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
2465                             msg->im_dst.s_addr))
2466                 goto nla_put_failure;
2467
2468         nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2469         if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2470                                   nla_data(nla), payloadlen))
2471                 goto nla_put_failure;
2472
2473         nlmsg_end(skb, nlh);
2474
2475         rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2476         return;
2477
2478 nla_put_failure:
2479         nlmsg_cancel(skb, nlh);
2480 errout:
2481         kfree_skb(skb);
2482         rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2483 }
2484
2485 static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
2486                                        const struct nlmsghdr *nlh,
2487                                        struct nlattr **tb,
2488                                        struct netlink_ext_ack *extack)
2489 {
2490         struct rtmsg *rtm;
2491         int i, err;
2492
2493         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2494                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
2495                 return -EINVAL;
2496         }
2497
2498         if (!netlink_strict_get_check(skb))
2499                 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
2500                                               rtm_ipv4_policy, extack);
2501
2502         rtm = nlmsg_data(nlh);
2503         if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
2504             (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
2505             rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2506             rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2507                 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
2508                 return -EINVAL;
2509         }
2510
2511         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2512                                             rtm_ipv4_policy, extack);
2513         if (err)
2514                 return err;
2515
2516         if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2517             (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2518                 NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
2519                 return -EINVAL;
2520         }
2521
2522         for (i = 0; i <= RTA_MAX; i++) {
2523                 if (!tb[i])
2524                         continue;
2525
2526                 switch (i) {
2527                 case RTA_SRC:
2528                 case RTA_DST:
2529                 case RTA_TABLE:
2530                         break;
2531                 default:
2532                         NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
2533                         return -EINVAL;
2534                 }
2535         }
2536
2537         return 0;
2538 }
2539
2540 static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2541                              struct netlink_ext_ack *extack)
2542 {
2543         struct net *net = sock_net(in_skb->sk);
2544         struct nlattr *tb[RTA_MAX + 1];
2545         struct sk_buff *skb = NULL;
2546         struct mfc_cache *cache;
2547         struct mr_table *mrt;
2548         __be32 src, grp;
2549         u32 tableid;
2550         int err;
2551
2552         err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
2553         if (err < 0)
2554                 goto errout;
2555
2556         src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2557         grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2558         tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2559
2560         mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2561         if (!mrt) {
2562                 err = -ENOENT;
2563                 goto errout_free;
2564         }
2565
2566         /* entries are added/deleted only under RTNL */
2567         rcu_read_lock();
2568         cache = ipmr_cache_find(mrt, src, grp);
2569         rcu_read_unlock();
2570         if (!cache) {
2571                 err = -ENOENT;
2572                 goto errout_free;
2573         }
2574
2575         skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2576         if (!skb) {
2577                 err = -ENOBUFS;
2578                 goto errout_free;
2579         }
2580
2581         err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2582                                nlh->nlmsg_seq, cache,
2583                                RTM_NEWROUTE, 0);
2584         if (err < 0)
2585                 goto errout_free;
2586
2587         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2588
2589 errout:
2590         return err;
2591
2592 errout_free:
2593         kfree_skb(skb);
2594         goto errout;
2595 }
2596
2597 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2598 {
2599         struct fib_dump_filter filter = {};
2600         int err;
2601
2602         if (cb->strict_check) {
2603                 err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
2604                                             &filter, cb);
2605                 if (err < 0)
2606                         return err;
2607         }
2608
2609         if (filter.table_id) {
2610                 struct mr_table *mrt;
2611
2612                 mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
2613                 if (!mrt) {
2614                         if (filter.dump_all_families)
2615                                 return skb->len;
2616
2617                         NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
2618                         return -ENOENT;
2619                 }
2620                 err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
2621                                     &mfc_unres_lock, &filter);
2622                 return skb->len ? : err;
2623         }
2624
2625         return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
2626                                 _ipmr_fill_mroute, &mfc_unres_lock, &filter);
2627 }
2628
2629 static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2630         [RTA_SRC]       = { .type = NLA_U32 },
2631         [RTA_DST]       = { .type = NLA_U32 },
2632         [RTA_IIF]       = { .type = NLA_U32 },
2633         [RTA_TABLE]     = { .type = NLA_U32 },
2634         [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2635 };
2636
2637 static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2638 {
2639         switch (rtm_protocol) {
2640         case RTPROT_STATIC:
2641         case RTPROT_MROUTED:
2642                 return true;
2643         }
2644         return false;
2645 }
2646
2647 static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2648 {
2649         struct rtnexthop *rtnh = nla_data(nla);
2650         int remaining = nla_len(nla), vifi = 0;
2651
2652         while (rtnh_ok(rtnh, remaining)) {
2653                 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2654                 if (++vifi == MAXVIFS)
2655                         break;
2656                 rtnh = rtnh_next(rtnh, &remaining);
2657         }
2658
2659         return remaining > 0 ? -EINVAL : vifi;
2660 }
2661
2662 /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2663 static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2664                             struct mfcctl *mfcc, int *mrtsock,
2665                             struct mr_table **mrtret,
2666                             struct netlink_ext_ack *extack)
2667 {
2668         struct net_device *dev = NULL;
2669         u32 tblid = RT_TABLE_DEFAULT;
2670         struct mr_table *mrt;
2671         struct nlattr *attr;
2672         struct rtmsg *rtm;
2673         int ret, rem;
2674
2675         ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX,
2676                                         rtm_ipmr_policy, extack);
2677         if (ret < 0)
2678                 goto out;
2679         rtm = nlmsg_data(nlh);
2680
2681         ret = -EINVAL;
2682         if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2683             rtm->rtm_type != RTN_MULTICAST ||
2684             rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2685             !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2686                 goto out;
2687
2688         memset(mfcc, 0, sizeof(*mfcc));
2689         mfcc->mfcc_parent = -1;
2690         ret = 0;
2691         nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2692                 switch (nla_type(attr)) {
2693                 case RTA_SRC:
2694                         mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2695                         break;
2696                 case RTA_DST:
2697                         mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2698                         break;
2699                 case RTA_IIF:
2700                         dev = __dev_get_by_index(net, nla_get_u32(attr));
2701                         if (!dev) {
2702                                 ret = -ENODEV;
2703                                 goto out;
2704                         }
2705                         break;
2706                 case RTA_MULTIPATH:
2707                         if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2708                                 ret = -EINVAL;
2709                                 goto out;
2710                         }
2711                         break;
2712                 case RTA_PREFSRC:
2713                         ret = 1;
2714                         break;
2715                 case RTA_TABLE:
2716                         tblid = nla_get_u32(attr);
2717                         break;
2718                 }
2719         }
2720         mrt = ipmr_get_table(net, tblid);
2721         if (!mrt) {
2722                 ret = -ENOENT;
2723                 goto out;
2724         }
2725         *mrtret = mrt;
2726         *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2727         if (dev)
2728                 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2729
2730 out:
2731         return ret;
2732 }
2733
2734 /* takes care of both newroute and delroute */
2735 static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2736                           struct netlink_ext_ack *extack)
2737 {
2738         struct net *net = sock_net(skb->sk);
2739         int ret, mrtsock, parent;
2740         struct mr_table *tbl;
2741         struct mfcctl mfcc;
2742
2743         mrtsock = 0;
2744         tbl = NULL;
2745         ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
2746         if (ret < 0)
2747                 return ret;
2748
2749         parent = ret ? mfcc.mfcc_parent : -1;
2750         if (nlh->nlmsg_type == RTM_NEWROUTE)
2751                 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2752         else
2753                 return ipmr_mfc_delete(tbl, &mfcc, parent);
2754 }
2755
2756 static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2757 {
2758         u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2759
2760         if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2761             nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2762             nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2763                         mrt->mroute_reg_vif_num) ||
2764             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2765                        mrt->mroute_do_assert) ||
2766             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
2767             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
2768                        mrt->mroute_do_wrvifwhole))
2769                 return false;
2770
2771         return true;
2772 }
2773
2774 static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2775 {
2776         struct nlattr *vif_nest;
2777         struct vif_device *vif;
2778
2779         /* if the VIF doesn't exist just continue */
2780         if (!VIF_EXISTS(mrt, vifid))
2781                 return true;
2782
2783         vif = &mrt->vif_table[vifid];
2784         vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF);
2785         if (!vif_nest)
2786                 return false;
2787         if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) ||
2788             nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2789             nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2790             nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2791                               IPMRA_VIFA_PAD) ||
2792             nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2793                               IPMRA_VIFA_PAD) ||
2794             nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2795                               IPMRA_VIFA_PAD) ||
2796             nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2797                               IPMRA_VIFA_PAD) ||
2798             nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2799             nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2800                 nla_nest_cancel(skb, vif_nest);
2801                 return false;
2802         }
2803         nla_nest_end(skb, vif_nest);
2804
2805         return true;
2806 }
2807
2808 static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
2809                                struct netlink_ext_ack *extack)
2810 {
2811         struct ifinfomsg *ifm;
2812
2813         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2814                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
2815                 return -EINVAL;
2816         }
2817
2818         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
2819                 NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
2820                 return -EINVAL;
2821         }
2822
2823         ifm = nlmsg_data(nlh);
2824         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2825             ifm->ifi_change || ifm->ifi_index) {
2826                 NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
2827                 return -EINVAL;
2828         }
2829
2830         return 0;
2831 }
2832
2833 static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2834 {
2835         struct net *net = sock_net(skb->sk);
2836         struct nlmsghdr *nlh = NULL;
2837         unsigned int t = 0, s_t;
2838         unsigned int e = 0, s_e;
2839         struct mr_table *mrt;
2840
2841         if (cb->strict_check) {
2842                 int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
2843
2844                 if (err < 0)
2845                         return err;
2846         }
2847
2848         s_t = cb->args[0];
2849         s_e = cb->args[1];
2850
2851         ipmr_for_each_table(mrt, net) {
2852                 struct nlattr *vifs, *af;
2853                 struct ifinfomsg *hdr;
2854                 u32 i;
2855
2856                 if (t < s_t)
2857                         goto skip_table;
2858                 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2859                                 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2860                                 sizeof(*hdr), NLM_F_MULTI);
2861                 if (!nlh)
2862                         break;
2863
2864                 hdr = nlmsg_data(nlh);
2865                 memset(hdr, 0, sizeof(*hdr));
2866                 hdr->ifi_family = RTNL_FAMILY_IPMR;
2867
2868                 af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
2869                 if (!af) {
2870                         nlmsg_cancel(skb, nlh);
2871                         goto out;
2872                 }
2873
2874                 if (!ipmr_fill_table(mrt, skb)) {
2875                         nlmsg_cancel(skb, nlh);
2876                         goto out;
2877                 }
2878
2879                 vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS);
2880                 if (!vifs) {
2881                         nla_nest_end(skb, af);
2882                         nlmsg_end(skb, nlh);
2883                         goto out;
2884                 }
2885                 for (i = 0; i < mrt->maxvif; i++) {
2886                         if (e < s_e)
2887                                 goto skip_entry;
2888                         if (!ipmr_fill_vif(mrt, i, skb)) {
2889                                 nla_nest_end(skb, vifs);
2890                                 nla_nest_end(skb, af);
2891                                 nlmsg_end(skb, nlh);
2892                                 goto out;
2893                         }
2894 skip_entry:
2895                         e++;
2896                 }
2897                 s_e = 0;
2898                 e = 0;
2899                 nla_nest_end(skb, vifs);
2900                 nla_nest_end(skb, af);
2901                 nlmsg_end(skb, nlh);
2902 skip_table:
2903                 t++;
2904         }
2905
2906 out:
2907         cb->args[1] = e;
2908         cb->args[0] = t;
2909
2910         return skb->len;
2911 }
2912
2913 #ifdef CONFIG_PROC_FS
2914 /* The /proc interfaces to multicast routing :
2915  * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2916  */
2917
2918 static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2919         __acquires(mrt_lock)
2920 {
2921         struct mr_vif_iter *iter = seq->private;
2922         struct net *net = seq_file_net(seq);
2923         struct mr_table *mrt;
2924
2925         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2926         if (!mrt)
2927                 return ERR_PTR(-ENOENT);
2928
2929         iter->mrt = mrt;
2930
2931         read_lock(&mrt_lock);
2932         return mr_vif_seq_start(seq, pos);
2933 }
2934
2935 static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2936         __releases(mrt_lock)
2937 {
2938         read_unlock(&mrt_lock);
2939 }
2940
2941 static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2942 {
2943         struct mr_vif_iter *iter = seq->private;
2944         struct mr_table *mrt = iter->mrt;
2945
2946         if (v == SEQ_START_TOKEN) {
2947                 seq_puts(seq,
2948                          "Interface      BytesIn  PktsIn  BytesOut PktsOut Flags Local    Remote\n");
2949         } else {
2950                 const struct vif_device *vif = v;
2951                 const char *name =  vif->dev ?
2952                                     vif->dev->name : "none";
2953
2954                 seq_printf(seq,
2955                            "%2td %-10s %8ld %7ld  %8ld %7ld %05X %08X %08X\n",
2956                            vif - mrt->vif_table,
2957                            name, vif->bytes_in, vif->pkt_in,
2958                            vif->bytes_out, vif->pkt_out,
2959                            vif->flags, vif->local, vif->remote);
2960         }
2961         return 0;
2962 }
2963
2964 static const struct seq_operations ipmr_vif_seq_ops = {
2965         .start = ipmr_vif_seq_start,
2966         .next  = mr_vif_seq_next,
2967         .stop  = ipmr_vif_seq_stop,
2968         .show  = ipmr_vif_seq_show,
2969 };
2970
2971 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2972 {
2973         struct net *net = seq_file_net(seq);
2974         struct mr_table *mrt;
2975
2976         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2977         if (!mrt)
2978                 return ERR_PTR(-ENOENT);
2979
2980         return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
2981 }
2982
2983 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2984 {
2985         int n;
2986
2987         if (v == SEQ_START_TOKEN) {
2988                 seq_puts(seq,
2989                  "Group    Origin   Iif     Pkts    Bytes    Wrong Oifs\n");
2990         } else {
2991                 const struct mfc_cache *mfc = v;
2992                 const struct mr_mfc_iter *it = seq->private;
2993                 const struct mr_table *mrt = it->mrt;
2994
2995                 seq_printf(seq, "%08X %08X %-3hd",
2996                            (__force u32) mfc->mfc_mcastgrp,
2997                            (__force u32) mfc->mfc_origin,
2998                            mfc->_c.mfc_parent);
2999
3000                 if (it->cache != &mrt->mfc_unres_queue) {
3001                         seq_printf(seq, " %8lu %8lu %8lu",
3002                                    mfc->_c.mfc_un.res.pkt,
3003                                    mfc->_c.mfc_un.res.bytes,
3004                                    mfc->_c.mfc_un.res.wrong_if);
3005                         for (n = mfc->_c.mfc_un.res.minvif;
3006                              n < mfc->_c.mfc_un.res.maxvif; n++) {
3007                                 if (VIF_EXISTS(mrt, n) &&
3008                                     mfc->_c.mfc_un.res.ttls[n] < 255)
3009                                         seq_printf(seq,
3010                                            " %2d:%-3d",
3011                                            n, mfc->_c.mfc_un.res.ttls[n]);
3012                         }
3013                 } else {
3014                         /* unresolved mfc_caches don't contain
3015                          * pkt, bytes and wrong_if values
3016                          */
3017                         seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
3018                 }
3019                 seq_putc(seq, '\n');
3020         }
3021         return 0;
3022 }
3023
3024 static const struct seq_operations ipmr_mfc_seq_ops = {
3025         .start = ipmr_mfc_seq_start,
3026         .next  = mr_mfc_seq_next,
3027         .stop  = mr_mfc_seq_stop,
3028         .show  = ipmr_mfc_seq_show,
3029 };
3030 #endif
3031
3032 #ifdef CONFIG_IP_PIMSM_V2
3033 static const struct net_protocol pim_protocol = {
3034         .handler        =       pim_rcv,
3035         .netns_ok       =       1,
3036 };
3037 #endif
3038
3039 static unsigned int ipmr_seq_read(struct net *net)
3040 {
3041         ASSERT_RTNL();
3042
3043         return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
3044 }
3045
3046 static int ipmr_dump(struct net *net, struct notifier_block *nb,
3047                      struct netlink_ext_ack *extack)
3048 {
3049         return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
3050                        ipmr_mr_table_iter, &mrt_lock, extack);
3051 }
3052
3053 static const struct fib_notifier_ops ipmr_notifier_ops_template = {
3054         .family         = RTNL_FAMILY_IPMR,
3055         .fib_seq_read   = ipmr_seq_read,
3056         .fib_dump       = ipmr_dump,
3057         .owner          = THIS_MODULE,
3058 };
3059
3060 static int __net_init ipmr_notifier_init(struct net *net)
3061 {
3062         struct fib_notifier_ops *ops;
3063
3064         net->ipv4.ipmr_seq = 0;
3065
3066         ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
3067         if (IS_ERR(ops))
3068                 return PTR_ERR(ops);
3069         net->ipv4.ipmr_notifier_ops = ops;
3070
3071         return 0;
3072 }
3073
3074 static void __net_exit ipmr_notifier_exit(struct net *net)
3075 {
3076         fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
3077         net->ipv4.ipmr_notifier_ops = NULL;
3078 }
3079
3080 /* Setup for IP multicast routing */
3081 static int __net_init ipmr_net_init(struct net *net)
3082 {
3083         int err;
3084
3085         err = ipmr_notifier_init(net);
3086         if (err)
3087                 goto ipmr_notifier_fail;
3088
3089         err = ipmr_rules_init(net);
3090         if (err < 0)
3091                 goto ipmr_rules_fail;
3092
3093 #ifdef CONFIG_PROC_FS
3094         err = -ENOMEM;
3095         if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
3096                         sizeof(struct mr_vif_iter)))
3097                 goto proc_vif_fail;
3098         if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
3099                         sizeof(struct mr_mfc_iter)))
3100                 goto proc_cache_fail;
3101 #endif
3102         return 0;
3103
3104 #ifdef CONFIG_PROC_FS
3105 proc_cache_fail:
3106         remove_proc_entry("ip_mr_vif", net->proc_net);
3107 proc_vif_fail:
3108         ipmr_rules_exit(net);
3109 #endif
3110 ipmr_rules_fail:
3111         ipmr_notifier_exit(net);
3112 ipmr_notifier_fail:
3113         return err;
3114 }
3115
3116 static void __net_exit ipmr_net_exit(struct net *net)
3117 {
3118 #ifdef CONFIG_PROC_FS
3119         remove_proc_entry("ip_mr_cache", net->proc_net);
3120         remove_proc_entry("ip_mr_vif", net->proc_net);
3121 #endif
3122         ipmr_notifier_exit(net);
3123         ipmr_rules_exit(net);
3124 }
3125
3126 static struct pernet_operations ipmr_net_ops = {
3127         .init = ipmr_net_init,
3128         .exit = ipmr_net_exit,
3129 };
3130
3131 int __init ip_mr_init(void)
3132 {
3133         int err;
3134
3135         mrt_cachep = kmem_cache_create("ip_mrt_cache",
3136                                        sizeof(struct mfc_cache),
3137                                        0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
3138                                        NULL);
3139
3140         err = register_pernet_subsys(&ipmr_net_ops);
3141         if (err)
3142                 goto reg_pernet_fail;
3143
3144         err = register_netdevice_notifier(&ip_mr_notifier);
3145         if (err)
3146                 goto reg_notif_fail;
3147 #ifdef CONFIG_IP_PIMSM_V2
3148         if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
3149                 pr_err("%s: can't add PIM protocol\n", __func__);
3150                 err = -EAGAIN;
3151                 goto add_proto_fail;
3152         }
3153 #endif
3154         rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
3155                       ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
3156         rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
3157                       ipmr_rtm_route, NULL, 0);
3158         rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
3159                       ipmr_rtm_route, NULL, 0);
3160
3161         rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
3162                       NULL, ipmr_rtm_dumplink, 0);
3163         return 0;
3164
3165 #ifdef CONFIG_IP_PIMSM_V2
3166 add_proto_fail:
3167         unregister_netdevice_notifier(&ip_mr_notifier);
3168 #endif
3169 reg_notif_fail:
3170         unregister_pernet_subsys(&ipmr_net_ops);
3171 reg_pernet_fail:
3172         kmem_cache_destroy(mrt_cachep);
3173         return err;
3174 }