net/ipv4/ipmr.c

   1 /*
   2  *      IP multicast routing support for mrouted 3.6/3.8
   3  *
   4  *              (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk>
   5  *        Linux Consultancy and Custom Driver Development
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  *
  12  *      Fixes:
  13  *      Michael Chastain        :       Incorrect size of copying.
  14  *      Alan Cox                :       Added the cache manager code
  15  *      Alan Cox                :       Fixed the clone/copy bug and device race.
  16  *      Mike McLagan            :       Routing by source
  17  *      Malcolm Beattie         :       Buffer handling fixes.
  18  *      Alexey Kuznetsov        :       Double buffer free and other fixes.
  19  *      SVR Anand               :       Fixed several multicast bugs and problems.
  20  *      Alexey Kuznetsov        :       Status, optimisations and more.
  21  *      Brad Parker             :       Better behaviour on mrouted upcall
  22  *                                      overflow.
  23  *      Carlos Picoto           :       PIMv1 Support
  24  *      Pavlin Ivanov Radoslavov:       PIMv2 Registers must checksum only PIM header
  25  *                                      Relax this requirement to work with older peers.
  26  *
  27  */
  28
  29 #include <linux/uaccess.h>
  30 #include <linux/types.h>
  31 #include <linux/cache.h>
  32 #include <linux/capability.h>
  33 #include <linux/errno.h>
  34 #include <linux/mm.h>
  35 #include <linux/kernel.h>
  36 #include <linux/fcntl.h>
  37 #include <linux/stat.h>
  38 #include <linux/socket.h>
  39 #include <linux/in.h>
  40 #include <linux/inet.h>
  41 #include <linux/netdevice.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/igmp.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/mroute.h>
  47 #include <linux/init.h>
  48 #include <linux/if_ether.h>
  49 #include <linux/slab.h>
  50 #include <net/net_namespace.h>
  51 #include <net/ip.h>
  52 #include <net/protocol.h>
  53 #include <linux/skbuff.h>
  54 #include <net/route.h>
  55 #include <net/icmp.h>
  56 #include <net/udp.h>
  57 #include <net/raw.h>
  58 #include <linux/notifier.h>
  59 #include <linux/if_arp.h>
  60 #include <linux/netfilter_ipv4.h>
  61 #include <linux/compat.h>
  62 #include <linux/export.h>
  63 #include <linux/rhashtable.h>
  64 #include <net/ip_tunnels.h>
  65 #include <net/checksum.h>
  66 #include <net/netlink.h>
  67 #include <net/fib_rules.h>
  68 #include <linux/netconf.h>
  69 #include <net/nexthop.h>
  70
  71 #include <linux/nospec.h>
  72
  73 struct ipmr_rule {
  74         struct fib_rule         common;
  75 };
  76
  77 struct ipmr_result {
  78         struct mr_table         *mrt;
  79 };
  80
  81 /* Big lock, protecting vif table, mrt cache and mroute socket state.
  82  * Note that the changes are semaphored via rtnl_lock.
  83  */
  84
  85 static DEFINE_RWLOCK(mrt_lock);
  86
  87 /* Multicast router control variables */
  88
  89 /* Special spinlock for queue of unresolved entries */
  90 static DEFINE_SPINLOCK(mfc_unres_lock);
  91
  92 /* We return to original Alan's scheme. Hash table of resolved
  93  * entries is changed only in process context and protected
  94  * with weak lock mrt_lock. Queue of unresolved entries is protected
  95  * with strong spinlock mfc_unres_lock.
  96  *
  97  * In this case data path is free of exclusive locks at all.
  98  */
  99
 100 static struct kmem_cache *mrt_cachep __ro_after_init;
 101
 102 static struct mr_table *ipmr_new_table(struct net *net, u32 id);
 103 static void ipmr_free_table(struct mr_table *mrt);
 104
 105 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
 106                           struct net_device *dev, struct sk_buff *skb,
 107                           struct mfc_cache *cache, int local);
 108 static int ipmr_cache_report(struct mr_table *mrt,
 109                              struct sk_buff *pkt, vifi_t vifi, int assert);
 110 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
 111                                  int cmd);
 112 static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
 113 static void mroute_clean_tables(struct mr_table *mrt, int flags);
 114 static void ipmr_expire_process(struct timer_list *t);
 115
 116 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
 117 #define ipmr_for_each_table(mrt, net) \
 118         list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
 119
 120 static struct mr_table *ipmr_mr_table_iter(struct net *net,
 121                                            struct mr_table *mrt)
 122 {
 123         struct mr_table *ret;
 124
 125         if (!mrt)
 126                 ret = list_entry_rcu(net->ipv4.mr_tables.next,
 127                                      struct mr_table, list);
 128         else
 129                 ret = list_entry_rcu(mrt->list.next,
 130                                      struct mr_table, list);
 131
 132         if (&ret->list == &net->ipv4.mr_tables)
 133                 return NULL;
 134         return ret;
 135 }
 136
 137 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
 138 {
 139         struct mr_table *mrt;
 140
 141         ipmr_for_each_table(mrt, net) {
 142                 if (mrt->id == id)
 143                         return mrt;
 144         }
 145         return NULL;
 146 }
 147
 148 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
 149                            struct mr_table **mrt)
 150 {
 151         int err;
 152         struct ipmr_result res;
 153         struct fib_lookup_arg arg = {
 154                 .result = &res,
 155                 .flags = FIB_LOOKUP_NOREF,
 156         };
 157
 158         /* update flow if oif or iif point to device enslaved to l3mdev */
 159         l3mdev_update_flow(net, flowi4_to_flowi(flp4));
 160
 161         err = fib_rules_lookup(net->ipv4.mr_rules_ops,
 162                                flowi4_to_flowi(flp4), 0, &arg);
 163         if (err < 0)
 164                 return err;
 165         *mrt = res.mrt;
 166         return 0;
 167 }
 168
 169 static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
 170                             int flags, struct fib_lookup_arg *arg)
 171 {
 172         struct ipmr_result *res = arg->result;
 173         struct mr_table *mrt;
 174
 175         switch (rule->action) {
 176         case FR_ACT_TO_TBL:
 177                 break;
 178         case FR_ACT_UNREACHABLE:
 179                 return -ENETUNREACH;
 180         case FR_ACT_PROHIBIT:
 181                 return -EACCES;
 182         case FR_ACT_BLACKHOLE:
 183         default:
 184                 return -EINVAL;
 185         }
 186
 187         arg->table = fib_rule_get_table(rule, arg);
 188
 189         mrt = ipmr_get_table(rule->fr_net, arg->table);
 190         if (!mrt)
 191                 return -EAGAIN;
 192         res->mrt = mrt;
 193         return 0;
 194 }
 195
 196 static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
 197 {
 198         return 1;
 199 }
 200
 201 static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
 202         FRA_GENERIC_POLICY,
 203 };
 204
 205 static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 206                                struct fib_rule_hdr *frh, struct nlattr **tb,
 207                                struct netlink_ext_ack *extack)
 208 {
 209         return 0;
 210 }
 211
 212 static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
 213                              struct nlattr **tb)
 214 {
 215         return 1;
 216 }
 217
 218 static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
 219                           struct fib_rule_hdr *frh)
 220 {
 221         frh->dst_len = 0;
 222         frh->src_len = 0;
 223         frh->tos     = 0;
 224         return 0;
 225 }
 226
 227 static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
 228         .family         = RTNL_FAMILY_IPMR,
 229         .rule_size      = sizeof(struct ipmr_rule),
 230         .addr_size      = sizeof(u32),
 231         .action         = ipmr_rule_action,
 232         .match          = ipmr_rule_match,
 233         .configure      = ipmr_rule_configure,
 234         .compare        = ipmr_rule_compare,
 235         .fill           = ipmr_rule_fill,
 236         .nlgroup        = RTNLGRP_IPV4_RULE,
 237         .policy         = ipmr_rule_policy,
 238         .owner          = THIS_MODULE,
 239 };
 240
 241 static int __net_init ipmr_rules_init(struct net *net)
 242 {
 243         struct fib_rules_ops *ops;
 244         struct mr_table *mrt;
 245         int err;
 246
 247         ops = fib_rules_register(&ipmr_rules_ops_template, net);
 248         if (IS_ERR(ops))
 249                 return PTR_ERR(ops);
 250
 251         INIT_LIST_HEAD(&net->ipv4.mr_tables);
 252
 253         mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
 254         if (IS_ERR(mrt)) {
 255                 err = PTR_ERR(mrt);
 256                 goto err1;
 257         }
 258
 259         err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
 260         if (err < 0)
 261                 goto err2;
 262
 263         net->ipv4.mr_rules_ops = ops;
 264         return 0;
 265
 266 err2:
 267         ipmr_free_table(mrt);
 268 err1:
 269         fib_rules_unregister(ops);
 270         return err;
 271 }
 272
 273 static void __net_exit ipmr_rules_exit(struct net *net)
 274 {
 275         struct mr_table *mrt, *next;
 276
 277         rtnl_lock();
 278         list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
 279                 list_del(&mrt->list);
 280                 ipmr_free_table(mrt);
 281         }
 282         fib_rules_unregister(net->ipv4.mr_rules_ops);
 283         rtnl_unlock();
 284 }
 285
 286 static int ipmr_rules_dump(struct net *net, struct notifier_block *nb)
 287 {
 288         return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR);
 289 }
 290
 291 static unsigned int ipmr_rules_seq_read(struct net *net)
 292 {
 293         return fib_rules_seq_read(net, RTNL_FAMILY_IPMR);
 294 }
 295
 296 bool ipmr_rule_default(const struct fib_rule *rule)
 297 {
 298         return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
 299 }
 300 EXPORT_SYMBOL(ipmr_rule_default);
 301 #else
 302 #define ipmr_for_each_table(mrt, net) \
 303         for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
 304
 305 static struct mr_table *ipmr_mr_table_iter(struct net *net,
 306                                            struct mr_table *mrt)
 307 {
 308         if (!mrt)
 309                 return net->ipv4.mrt;
 310         return NULL;
 311 }
 312
 313 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
 314 {
 315         return net->ipv4.mrt;
 316 }
 317
 318 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
 319                            struct mr_table **mrt)
 320 {
 321         *mrt = net->ipv4.mrt;
 322         return 0;
 323 }
 324
 325 static int __net_init ipmr_rules_init(struct net *net)
 326 {
 327         struct mr_table *mrt;
 328
 329         mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
 330         if (IS_ERR(mrt))
 331                 return PTR_ERR(mrt);
 332         net->ipv4.mrt = mrt;
 333         return 0;
 334 }
 335
 336 static void __net_exit ipmr_rules_exit(struct net *net)
 337 {
 338         rtnl_lock();
 339         ipmr_free_table(net->ipv4.mrt);
 340         net->ipv4.mrt = NULL;
 341         rtnl_unlock();
 342 }
 343
 344 static int ipmr_rules_dump(struct net *net, struct notifier_block *nb)
 345 {
 346         return 0;
 347 }
 348
 349 static unsigned int ipmr_rules_seq_read(struct net *net)
 350 {
 351         return 0;
 352 }
 353
 354 bool ipmr_rule_default(const struct fib_rule *rule)
 355 {
 356         return true;
 357 }
 358 EXPORT_SYMBOL(ipmr_rule_default);
 359 #endif
 360
 361 static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
 362                                 const void *ptr)
 363 {
 364         const struct mfc_cache_cmp_arg *cmparg = arg->key;
 365         struct mfc_cache *c = (struct mfc_cache *)ptr;
 366
 367         return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
 368                cmparg->mfc_origin != c->mfc_origin;
 369 }
 370
 371 static const struct rhashtable_params ipmr_rht_params = {
 372         .head_offset = offsetof(struct mr_mfc, mnode),
 373         .key_offset = offsetof(struct mfc_cache, cmparg),
 374         .key_len = sizeof(struct mfc_cache_cmp_arg),
 375         .nelem_hint = 3,
 376         .locks_mul = 1,
 377         .obj_cmpfn = ipmr_hash_cmp,
 378         .automatic_shrinking = true,
 379 };
 380
 381 static void ipmr_new_table_set(struct mr_table *mrt,
 382                                struct net *net)
 383 {
 384 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
 385         list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
 386 #endif
 387 }
 388
 389 static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = {
 390         .mfc_mcastgrp = htonl(INADDR_ANY),
 391         .mfc_origin = htonl(INADDR_ANY),
 392 };
 393
 394 static struct mr_table_ops ipmr_mr_table_ops = {
 395         .rht_params = &ipmr_rht_params,
 396         .cmparg_any = &ipmr_mr_table_ops_cmparg_any,
 397 };
 398
 399 static struct mr_table *ipmr_new_table(struct net *net, u32 id)
 400 {
 401         struct mr_table *mrt;
 402
 403         /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
 404         if (id != RT_TABLE_DEFAULT && id >= 1000000000)
 405                 return ERR_PTR(-EINVAL);
 406
 407         mrt = ipmr_get_table(net, id);
 408         if (mrt)
 409                 return mrt;
 410
 411         return mr_table_alloc(net, id, &ipmr_mr_table_ops,
 412                               ipmr_expire_process, ipmr_new_table_set);
 413 }
 414
 415 static void ipmr_free_table(struct mr_table *mrt)
 416 {
 417         del_timer_sync(&mrt->ipmr_expire_timer);
 418         mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC |
 419                                  MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC);
 420         rhltable_destroy(&mrt->mfc_hash);
 421         kfree(mrt);
 422 }
 423
 424 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
 425
 426 static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
 427 {
 428         struct net *net = dev_net(dev);
 429
 430         dev_close(dev);
 431
 432         dev = __dev_get_by_name(net, "tunl0");
 433         if (dev) {
 434                 const struct net_device_ops *ops = dev->netdev_ops;
 435                 struct ifreq ifr;
 436                 struct ip_tunnel_parm p;
 437
 438                 memset(&p, 0, sizeof(p));
 439                 p.iph.daddr = v->vifc_rmt_addr.s_addr;
 440                 p.iph.saddr = v->vifc_lcl_addr.s_addr;
 441                 p.iph.version = 4;
 442                 p.iph.ihl = 5;
 443                 p.iph.protocol = IPPROTO_IPIP;
 444                 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
 445                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
 446
 447                 if (ops->ndo_do_ioctl) {
 448                         mm_segment_t oldfs = get_fs();
 449
 450                         set_fs(KERNEL_DS);
 451                         ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
 452                         set_fs(oldfs);
 453                 }
 454         }
 455 }
 456
 457 /* Initialize ipmr pimreg/tunnel in_device */
 458 static bool ipmr_init_vif_indev(const struct net_device *dev)
 459 {
 460         struct in_device *in_dev;
 461
 462         ASSERT_RTNL();
 463
 464         in_dev = __in_dev_get_rtnl(dev);
 465         if (!in_dev)
 466                 return false;
 467         ipv4_devconf_setall(in_dev);
 468         neigh_parms_data_state_setall(in_dev->arp_parms);
 469         IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
 470
 471         return true;
 472 }
 473
 474 static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
 475 {
 476         struct net_device  *dev;
 477
 478         dev = __dev_get_by_name(net, "tunl0");
 479
 480         if (dev) {
 481                 const struct net_device_ops *ops = dev->netdev_ops;
 482                 int err;
 483                 struct ifreq ifr;
 484                 struct ip_tunnel_parm p;
 485
 486                 memset(&p, 0, sizeof(p));
 487                 p.iph.daddr = v->vifc_rmt_addr.s_addr;
 488                 p.iph.saddr = v->vifc_lcl_addr.s_addr;
 489                 p.iph.version = 4;
 490                 p.iph.ihl = 5;
 491                 p.iph.protocol = IPPROTO_IPIP;
 492                 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
 493                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
 494
 495                 if (ops->ndo_do_ioctl) {
 496                         mm_segment_t oldfs = get_fs();
 497
 498                         set_fs(KERNEL_DS);
 499                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
 500                         set_fs(oldfs);
 501                 } else {
 502                         err = -EOPNOTSUPP;
 503                 }
 504                 dev = NULL;
 505
 506                 if (err == 0 &&
 507                     (dev = __dev_get_by_name(net, p.name)) != NULL) {
 508                         dev->flags |= IFF_MULTICAST;
 509                         if (!ipmr_init_vif_indev(dev))
 510                                 goto failure;
 511                         if (dev_open(dev, NULL))
 512                                 goto failure;
 513                         dev_hold(dev);
 514                 }
 515         }
 516         return dev;
 517
 518 failure:
 519         unregister_netdevice(dev);
 520         return NULL;
 521 }
 522
 523 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
 524 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
 525 {
 526         struct net *net = dev_net(dev);
 527         struct mr_table *mrt;
 528         struct flowi4 fl4 = {
 529                 .flowi4_oif     = dev->ifindex,
 530                 .flowi4_iif     = skb->skb_iif ? : LOOPBACK_IFINDEX,
 531                 .flowi4_mark    = skb->mark,
 532         };
 533         int err;
 534
 535         err = ipmr_fib_lookup(net, &fl4, &mrt);
 536         if (err < 0) {
 537                 kfree_skb(skb);
 538                 return err;
 539         }
 540
 541         read_lock(&mrt_lock);
 542         dev->stats.tx_bytes += skb->len;
 543         dev->stats.tx_packets++;
 544         ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
 545         read_unlock(&mrt_lock);
 546         kfree_skb(skb);
 547         return NETDEV_TX_OK;
 548 }
 549
 550 static int reg_vif_get_iflink(const struct net_device *dev)
 551 {
 552         return 0;
 553 }
 554
 555 static const struct net_device_ops reg_vif_netdev_ops = {
 556         .ndo_start_xmit = reg_vif_xmit,
 557         .ndo_get_iflink = reg_vif_get_iflink,
 558 };
 559
 560 static void reg_vif_setup(struct net_device *dev)
 561 {
 562         dev->type               = ARPHRD_PIMREG;
 563         dev->mtu                = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
 564         dev->flags              = IFF_NOARP;
 565         dev->netdev_ops         = &reg_vif_netdev_ops;
 566         dev->needs_free_netdev  = true;
 567         dev->features           |= NETIF_F_NETNS_LOCAL;
 568 }
 569
 570 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
 571 {
 572         struct net_device *dev;
 573         char name[IFNAMSIZ];
 574
 575         if (mrt->id == RT_TABLE_DEFAULT)
 576                 sprintf(name, "pimreg");
 577         else
 578                 sprintf(name, "pimreg%u", mrt->id);
 579
 580         dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
 581
 582         if (!dev)
 583                 return NULL;
 584
 585         dev_net_set(dev, net);
 586
 587         if (register_netdevice(dev)) {
 588                 free_netdev(dev);
 589                 return NULL;
 590         }
 591
 592         if (!ipmr_init_vif_indev(dev))
 593                 goto failure;
 594         if (dev_open(dev, NULL))
 595                 goto failure;
 596
 597         dev_hold(dev);
 598
 599         return dev;
 600
 601 failure:
 602         unregister_netdevice(dev);
 603         return NULL;
 604 }
 605
 606 /* called with rcu_read_lock() */
 607 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
 608                      unsigned int pimlen)
 609 {
 610         struct net_device *reg_dev = NULL;
 611         struct iphdr *encap;
 612
 613         encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
 614         /* Check that:
 615          * a. packet is really sent to a multicast group
 616          * b. packet is not a NULL-REGISTER
 617          * c. packet is not truncated
 618          */
 619         if (!ipv4_is_multicast(encap->daddr) ||
 620             encap->tot_len == 0 ||
 621             ntohs(encap->tot_len) + pimlen > skb->len)
 622                 return 1;
 623
 624         read_lock(&mrt_lock);
 625         if (mrt->mroute_reg_vif_num >= 0)
 626                 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
 627         read_unlock(&mrt_lock);
 628
 629         if (!reg_dev)
 630                 return 1;
 631
 632         skb->mac_header = skb->network_header;
 633         skb_pull(skb, (u8 *)encap - skb->data);
 634         skb_reset_network_header(skb);
 635         skb->protocol = htons(ETH_P_IP);
 636         skb->ip_summed = CHECKSUM_NONE;
 637
 638         skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
 639
 640         netif_rx(skb);
 641
 642         return NET_RX_SUCCESS;
 643 }
 644 #else
 645 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
 646 {
 647         return NULL;
 648 }
 649 #endif
 650
 651 static int call_ipmr_vif_entry_notifiers(struct net *net,
 652                                          enum fib_event_type event_type,
 653                                          struct vif_device *vif,
 654                                          vifi_t vif_index, u32 tb_id)
 655 {
 656         return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type,
 657                                      vif, vif_index, tb_id,
 658                                      &net->ipv4.ipmr_seq);
 659 }
 660
 661 static int call_ipmr_mfc_entry_notifiers(struct net *net,
 662                                          enum fib_event_type event_type,
 663                                          struct mfc_cache *mfc, u32 tb_id)
 664 {
 665         return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type,
 666                                      &mfc->_c, tb_id, &net->ipv4.ipmr_seq);
 667 }
 668
 669 /**
 670  *      vif_delete - Delete a VIF entry
 671  *      @notify: Set to 1, if the caller is a notifier_call
 672  */
 673 static int vif_delete(struct mr_table *mrt, int vifi, int notify,
 674                       struct list_head *head)
 675 {
 676         struct net *net = read_pnet(&mrt->net);
 677         struct vif_device *v;
 678         struct net_device *dev;
 679         struct in_device *in_dev;
 680
 681         if (vifi < 0 || vifi >= mrt->maxvif)
 682                 return -EADDRNOTAVAIL;
 683
 684         v = &mrt->vif_table[vifi];
 685
 686         if (VIF_EXISTS(mrt, vifi))
 687                 call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, vifi,
 688                                               mrt->id);
 689
 690         write_lock_bh(&mrt_lock);
 691         dev = v->dev;
 692         v->dev = NULL;
 693
 694         if (!dev) {
 695                 write_unlock_bh(&mrt_lock);
 696                 return -EADDRNOTAVAIL;
 697         }
 698
 699         if (vifi == mrt->mroute_reg_vif_num)
 700                 mrt->mroute_reg_vif_num = -1;
 701
 702         if (vifi + 1 == mrt->maxvif) {
 703                 int tmp;
 704
 705                 for (tmp = vifi - 1; tmp >= 0; tmp--) {
 706                         if (VIF_EXISTS(mrt, tmp))
 707                                 break;
 708                 }
 709                 mrt->maxvif = tmp+1;
 710         }
 711
 712         write_unlock_bh(&mrt_lock);
 713
 714         dev_set_allmulti(dev, -1);
 715
 716         in_dev = __in_dev_get_rtnl(dev);
 717         if (in_dev) {
 718                 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
 719                 inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 720                                             NETCONFA_MC_FORWARDING,
 721                                             dev->ifindex, &in_dev->cnf);
 722                 ip_rt_multicast_event(in_dev);
 723         }
 724
 725         if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
 726                 unregister_netdevice_queue(dev, head);
 727
 728         dev_put(dev);
 729         return 0;
 730 }
 731
 732 static void ipmr_cache_free_rcu(struct rcu_head *head)
 733 {
 734         struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
 735
 736         kmem_cache_free(mrt_cachep, (struct mfc_cache *)c);
 737 }
 738
 739 static void ipmr_cache_free(struct mfc_cache *c)
 740 {
 741         call_rcu(&c->_c.rcu, ipmr_cache_free_rcu);
 742 }
 743
 744 /* Destroy an unresolved cache entry, killing queued skbs
 745  * and reporting error to netlink readers.
 746  */
 747 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
 748 {
 749         struct net *net = read_pnet(&mrt->net);
 750         struct sk_buff *skb;
 751         struct nlmsgerr *e;
 752
 753         atomic_dec(&mrt->cache_resolve_queue_len);
 754
 755         while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) {
 756                 if (ip_hdr(skb)->version == 0) {
 757                         struct nlmsghdr *nlh = skb_pull(skb,
 758                                                         sizeof(struct iphdr));
 759                         nlh->nlmsg_type = NLMSG_ERROR;
 760                         nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
 761                         skb_trim(skb, nlh->nlmsg_len);
 762                         e = nlmsg_data(nlh);
 763                         e->error = -ETIMEDOUT;
 764                         memset(&e->msg, 0, sizeof(e->msg));
 765
 766                         rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
 767                 } else {
 768                         kfree_skb(skb);
 769                 }
 770         }
 771
 772         ipmr_cache_free(c);
 773 }
 774
 775 /* Timer process for the unresolved queue. */
 776 static void ipmr_expire_process(struct timer_list *t)
 777 {
 778         struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
 779         struct mr_mfc *c, *next;
 780         unsigned long expires;
 781         unsigned long now;
 782
 783         if (!spin_trylock(&mfc_unres_lock)) {
 784                 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
 785                 return;
 786         }
 787
 788         if (list_empty(&mrt->mfc_unres_queue))
 789                 goto out;
 790
 791         now = jiffies;
 792         expires = 10*HZ;
 793
 794         list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
 795                 if (time_after(c->mfc_un.unres.expires, now)) {
 796                         unsigned long interval = c->mfc_un.unres.expires - now;
 797                         if (interval < expires)
 798                                 expires = interval;
 799                         continue;
 800                 }
 801
 802                 list_del(&c->list);
 803                 mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE);
 804                 ipmr_destroy_unres(mrt, (struct mfc_cache *)c);
 805         }
 806
 807         if (!list_empty(&mrt->mfc_unres_queue))
 808                 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
 809
 810 out:
 811         spin_unlock(&mfc_unres_lock);
 812 }
 813
 814 /* Fill oifs list. It is called under write locked mrt_lock. */
 815 static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache,
 816                                    unsigned char *ttls)
 817 {
 818         int vifi;
 819
 820         cache->mfc_un.res.minvif = MAXVIFS;
 821         cache->mfc_un.res.maxvif = 0;
 822         memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
 823
 824         for (vifi = 0; vifi < mrt->maxvif; vifi++) {
 825                 if (VIF_EXISTS(mrt, vifi) &&
 826                     ttls[vifi] && ttls[vifi] < 255) {
 827                         cache->mfc_un.res.ttls[vifi] = ttls[vifi];
 828                         if (cache->mfc_un.res.minvif > vifi)
 829                                 cache->mfc_un.res.minvif = vifi;
 830                         if (cache->mfc_un.res.maxvif <= vifi)
 831                                 cache->mfc_un.res.maxvif = vifi + 1;
 832                 }
 833         }
 834         cache->mfc_un.res.lastuse = jiffies;
 835 }
 836
 837 static int vif_add(struct net *net, struct mr_table *mrt,
 838                    struct vifctl *vifc, int mrtsock)
 839 {
 840         struct netdev_phys_item_id ppid = { };
 841         int vifi = vifc->vifc_vifi;
 842         struct vif_device *v = &mrt->vif_table[vifi];
 843         struct net_device *dev;
 844         struct in_device *in_dev;
 845         int err;
 846
 847         /* Is vif busy ? */
 848         if (VIF_EXISTS(mrt, vifi))
 849                 return -EADDRINUSE;
 850
 851         switch (vifc->vifc_flags) {
 852         case VIFF_REGISTER:
 853                 if (!ipmr_pimsm_enabled())
 854                         return -EINVAL;
 855                 /* Special Purpose VIF in PIM
 856                  * All the packets will be sent to the daemon
 857                  */
 858                 if (mrt->mroute_reg_vif_num >= 0)
 859                         return -EADDRINUSE;
 860                 dev = ipmr_reg_vif(net, mrt);
 861                 if (!dev)
 862                         return -ENOBUFS;
 863                 err = dev_set_allmulti(dev, 1);
 864                 if (err) {
 865                         unregister_netdevice(dev);
 866                         dev_put(dev);
 867                         return err;
 868                 }
 869                 break;
 870         case VIFF_TUNNEL:
 871                 dev = ipmr_new_tunnel(net, vifc);
 872                 if (!dev)
 873                         return -ENOBUFS;
 874                 err = dev_set_allmulti(dev, 1);
 875                 if (err) {
 876                         ipmr_del_tunnel(dev, vifc);
 877                         dev_put(dev);
 878                         return err;
 879                 }
 880                 break;
 881         case VIFF_USE_IFINDEX:
 882         case 0:
 883                 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
 884                         dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
 885                         if (dev && !__in_dev_get_rtnl(dev)) {
 886                                 dev_put(dev);
 887                                 return -EADDRNOTAVAIL;
 888                         }
 889                 } else {
 890                         dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
 891                 }
 892                 if (!dev)
 893                         return -EADDRNOTAVAIL;
 894                 err = dev_set_allmulti(dev, 1);
 895                 if (err) {
 896                         dev_put(dev);
 897                         return err;
 898                 }
 899                 break;
 900         default:
 901                 return -EINVAL;
 902         }
 903
 904         in_dev = __in_dev_get_rtnl(dev);
 905         if (!in_dev) {
 906                 dev_put(dev);
 907                 return -EADDRNOTAVAIL;
 908         }
 909         IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
 910         inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
 911                                     dev->ifindex, &in_dev->cnf);
 912         ip_rt_multicast_event(in_dev);
 913
 914         /* Fill in the VIF structures */
 915         vif_device_init(v, dev, vifc->vifc_rate_limit,
 916                         vifc->vifc_threshold,
 917                         vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
 918                         (VIFF_TUNNEL | VIFF_REGISTER));
 919
 920         err = dev_get_port_parent_id(dev, &ppid, true);
 921         if (err == 0) {
 922                 memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
 923                 v->dev_parent_id.id_len = ppid.id_len;
 924         } else {
 925                 v->dev_parent_id.id_len = 0;
 926         }
 927
 928         v->local = vifc->vifc_lcl_addr.s_addr;
 929         v->remote = vifc->vifc_rmt_addr.s_addr;
 930
 931         /* And finish update writing critical data */
 932         write_lock_bh(&mrt_lock);
 933         v->dev = dev;
 934         if (v->flags & VIFF_REGISTER)
 935                 mrt->mroute_reg_vif_num = vifi;
 936         if (vifi+1 > mrt->maxvif)
 937                 mrt->maxvif = vifi+1;
 938         write_unlock_bh(&mrt_lock);
 939         call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, vifi, mrt->id);
 940         return 0;
 941 }
 942
 943 /* called with rcu_read_lock() */
 944 static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
 945                                          __be32 origin,
 946                                          __be32 mcastgrp)
 947 {
 948         struct mfc_cache_cmp_arg arg = {
 949                         .mfc_mcastgrp = mcastgrp,
 950                         .mfc_origin = origin
 951         };
 952
 953         return mr_mfc_find(mrt, &arg);
 954 }
 955
 956 /* Look for a (*,G) entry */
 957 static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
 958                                              __be32 mcastgrp, int vifi)
 959 {
 960         struct mfc_cache_cmp_arg arg = {
 961                         .mfc_mcastgrp = mcastgrp,
 962                         .mfc_origin = htonl(INADDR_ANY)
 963         };
 964
 965         if (mcastgrp == htonl(INADDR_ANY))
 966                 return mr_mfc_find_any_parent(mrt, vifi);
 967         return mr_mfc_find_any(mrt, vifi, &arg);
 968 }
 969
 970 /* Look for a (S,G,iif) entry if parent != -1 */
 971 static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
 972                                                 __be32 origin, __be32 mcastgrp,
 973                                                 int parent)
 974 {
 975         struct mfc_cache_cmp_arg arg = {
 976                         .mfc_mcastgrp = mcastgrp,
 977                         .mfc_origin = origin,
 978         };
 979
 980         return mr_mfc_find_parent(mrt, &arg, parent);
 981 }
 982
 983 /* Allocate a multicast cache entry */
 984 static struct mfc_cache *ipmr_cache_alloc(void)
 985 {
 986         struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
 987
 988         if (c) {
 989                 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
 990                 c->_c.mfc_un.res.minvif = MAXVIFS;
 991                 c->_c.free = ipmr_cache_free_rcu;
 992                 refcount_set(&c->_c.mfc_un.res.refcount, 1);
 993         }
 994         return c;
 995 }
 996
 997 static struct mfc_cache *ipmr_cache_alloc_unres(void)
 998 {
 999         struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1000
1001         if (c) {
1002                 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
1003                 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
1004         }
1005         return c;
1006 }
1007
1008 /* A cache entry has gone into a resolved state from queued */
1009 static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
1010                                struct mfc_cache *uc, struct mfc_cache *c)
1011 {
1012         struct sk_buff *skb;
1013         struct nlmsgerr *e;
1014
1015         /* Play the pending entries through our router */
1016         while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1017                 if (ip_hdr(skb)->version == 0) {
1018                         struct nlmsghdr *nlh = skb_pull(skb,
1019                                                         sizeof(struct iphdr));
1020
1021                         if (mr_fill_mroute(mrt, skb, &c->_c,
1022                                            nlmsg_data(nlh)) > 0) {
1023                                 nlh->nlmsg_len = skb_tail_pointer(skb) -
1024                                                  (u8 *)nlh;
1025                         } else {
1026                                 nlh->nlmsg_type = NLMSG_ERROR;
1027                                 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1028                                 skb_trim(skb, nlh->nlmsg_len);
1029                                 e = nlmsg_data(nlh);
1030                                 e->error = -EMSGSIZE;
1031                                 memset(&e->msg, 0, sizeof(e->msg));
1032                         }
1033
1034                         rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1035                 } else {
1036                         ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
1037                 }
1038         }
1039 }
1040
1041 /* Bounce a cache query up to mrouted and netlink.
1042  *
1043  * Called under mrt_lock.
1044  */
1045 static int ipmr_cache_report(struct mr_table *mrt,
1046                              struct sk_buff *pkt, vifi_t vifi, int assert)
1047 {
1048         const int ihl = ip_hdrlen(pkt);
1049         struct sock *mroute_sk;
1050         struct igmphdr *igmp;
1051         struct igmpmsg *msg;
1052         struct sk_buff *skb;
1053         int ret;
1054
1055         if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE)
1056                 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1057         else
1058                 skb = alloc_skb(128, GFP_ATOMIC);
1059
1060         if (!skb)
1061                 return -ENOBUFS;
1062
1063         if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) {
1064                 /* Ugly, but we have no choice with this interface.
1065                  * Duplicate old header, fix ihl, length etc.
1066                  * And all this only to mangle msg->im_msgtype and
1067                  * to set msg->im_mbz to "mbz" :-)
1068                  */
1069                 skb_push(skb, sizeof(struct iphdr));
1070                 skb_reset_network_header(skb);
1071                 skb_reset_transport_header(skb);
1072                 msg = (struct igmpmsg *)skb_network_header(skb);
1073                 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
1074                 msg->im_msgtype = assert;
1075                 msg->im_mbz = 0;
1076                 if (assert == IGMPMSG_WRVIFWHOLE)
1077                         msg->im_vif = vifi;
1078                 else
1079                         msg->im_vif = mrt->mroute_reg_vif_num;
1080                 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1081                 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1082                                              sizeof(struct iphdr));
1083         } else {
1084                 /* Copy the IP header */
1085                 skb_set_network_header(skb, skb->len);
1086                 skb_put(skb, ihl);
1087                 skb_copy_to_linear_data(skb, pkt->data, ihl);
1088                 /* Flag to the kernel this is a route add */
1089                 ip_hdr(skb)->protocol = 0;
1090                 msg = (struct igmpmsg *)skb_network_header(skb);
1091                 msg->im_vif = vifi;
1092                 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1093                 /* Add our header */
1094                 igmp = skb_put(skb, sizeof(struct igmphdr));
1095                 igmp->type = assert;
1096                 msg->im_msgtype = assert;
1097                 igmp->code = 0;
1098                 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1099                 skb->transport_header = skb->network_header;
1100         }
1101
1102         rcu_read_lock();
1103         mroute_sk = rcu_dereference(mrt->mroute_sk);
1104         if (!mroute_sk) {
1105                 rcu_read_unlock();
1106                 kfree_skb(skb);
1107                 return -EINVAL;
1108         }
1109
1110         igmpmsg_netlink_event(mrt, skb);
1111
1112         /* Deliver to mrouted */
1113         ret = sock_queue_rcv_skb(mroute_sk, skb);
1114         rcu_read_unlock();
1115         if (ret < 0) {
1116                 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1117                 kfree_skb(skb);
1118         }
1119
1120         return ret;
1121 }
1122
1123 /* Queue a packet for resolution. It gets locked cache entry! */
1124 static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
1125                                  struct sk_buff *skb, struct net_device *dev)
1126 {
1127         const struct iphdr *iph = ip_hdr(skb);
1128         struct mfc_cache *c;
1129         bool found = false;
1130         int err;
1131
1132         spin_lock_bh(&mfc_unres_lock);
1133         list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1134                 if (c->mfc_mcastgrp == iph->daddr &&
1135                     c->mfc_origin == iph->saddr) {
1136                         found = true;
1137                         break;
1138                 }
1139         }
1140
1141         if (!found) {
1142                 /* Create a new entry if allowable */
1143                 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1144                     (c = ipmr_cache_alloc_unres()) == NULL) {
1145                         spin_unlock_bh(&mfc_unres_lock);
1146
1147                         kfree_skb(skb);
1148                         return -ENOBUFS;
1149                 }
1150
1151                 /* Fill in the new cache entry */
1152                 c->_c.mfc_parent = -1;
1153                 c->mfc_origin   = iph->saddr;
1154                 c->mfc_mcastgrp = iph->daddr;
1155
1156                 /* Reflect first query at mrouted. */
1157                 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1158
1159                 if (err < 0) {
1160                         /* If the report failed throw the cache entry
1161                            out - Brad Parker
1162                          */
1163                         spin_unlock_bh(&mfc_unres_lock);
1164
1165                         ipmr_cache_free(c);
1166                         kfree_skb(skb);
1167                         return err;
1168                 }
1169
1170                 atomic_inc(&mrt->cache_resolve_queue_len);
1171                 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1172                 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1173
1174                 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1175                         mod_timer(&mrt->ipmr_expire_timer,
1176                                   c->_c.mfc_un.unres.expires);
1177         }
1178
1179         /* See if we can append the packet */
1180         if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1181                 kfree_skb(skb);
1182                 err = -ENOBUFS;
1183         } else {
1184                 if (dev) {
1185                         skb->dev = dev;
1186                         skb->skb_iif = dev->ifindex;
1187                 }
1188                 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1189                 err = 0;
1190         }
1191
1192         spin_unlock_bh(&mfc_unres_lock);
1193         return err;
1194 }
1195
1196 /* MFC cache manipulation by user space mroute daemon */
1197
1198 static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1199 {
1200         struct net *net = read_pnet(&mrt->net);
1201         struct mfc_cache *c;
1202
1203         /* The entries are added/deleted only under RTNL */
1204         rcu_read_lock();
1205         c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1206                                    mfc->mfcc_mcastgrp.s_addr, parent);
1207         rcu_read_unlock();
1208         if (!c)
1209                 return -ENOENT;
1210         rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params);
1211         list_del_rcu(&c->_c.list);
1212         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id);
1213         mroute_netlink_event(mrt, c, RTM_DELROUTE);
1214         mr_cache_put(&c->_c);
1215
1216         return 0;
1217 }
1218
1219 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1220                         struct mfcctl *mfc, int mrtsock, int parent)
1221 {
1222         struct mfc_cache *uc, *c;
1223         struct mr_mfc *_uc;
1224         bool found;
1225         int ret;
1226
1227         if (mfc->mfcc_parent >= MAXVIFS)
1228                 return -ENFILE;
1229
1230         /* The entries are added/deleted only under RTNL */
1231         rcu_read_lock();
1232         c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1233                                    mfc->mfcc_mcastgrp.s_addr, parent);
1234         rcu_read_unlock();
1235         if (c) {
1236                 write_lock_bh(&mrt_lock);
1237                 c->_c.mfc_parent = mfc->mfcc_parent;
1238                 ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1239                 if (!mrtsock)
1240                         c->_c.mfc_flags |= MFC_STATIC;
1241                 write_unlock_bh(&mrt_lock);
1242                 call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c,
1243                                               mrt->id);
1244                 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1245                 return 0;
1246         }
1247
1248         if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1249             !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1250                 return -EINVAL;
1251
1252         c = ipmr_cache_alloc();
1253         if (!c)
1254                 return -ENOMEM;
1255
1256         c->mfc_origin = mfc->mfcc_origin.s_addr;
1257         c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1258         c->_c.mfc_parent = mfc->mfcc_parent;
1259         ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls);
1260         if (!mrtsock)
1261                 c->_c.mfc_flags |= MFC_STATIC;
1262
1263         ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1264                                   ipmr_rht_params);
1265         if (ret) {
1266                 pr_err("ipmr: rhtable insert error %d\n", ret);
1267                 ipmr_cache_free(c);
1268                 return ret;
1269         }
1270         list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1271         /* Check to see if we resolved a queued list. If so we
1272          * need to send on the frames and tidy up.
1273          */
1274         found = false;
1275         spin_lock_bh(&mfc_unres_lock);
1276         list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1277                 uc = (struct mfc_cache *)_uc;
1278                 if (uc->mfc_origin == c->mfc_origin &&
1279                     uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1280                         list_del(&_uc->list);
1281                         atomic_dec(&mrt->cache_resolve_queue_len);
1282                         found = true;
1283                         break;
1284                 }
1285         }
1286         if (list_empty(&mrt->mfc_unres_queue))
1287                 del_timer(&mrt->ipmr_expire_timer);
1288         spin_unlock_bh(&mfc_unres_lock);
1289
1290         if (found) {
1291                 ipmr_cache_resolve(net, mrt, uc, c);
1292                 ipmr_cache_free(uc);
1293         }
1294         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id);
1295         mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1296         return 0;
1297 }
1298
1299 /* Close the multicast socket, and clear the vif tables etc */
1300 static void mroute_clean_tables(struct mr_table *mrt, int flags)
1301 {
1302         struct net *net = read_pnet(&mrt->net);
1303         struct mr_mfc *c, *tmp;
1304         struct mfc_cache *cache;
1305         LIST_HEAD(list);
1306         int i;
1307
1308         /* Shut down all active vif entries */
1309         if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) {
1310                 for (i = 0; i < mrt->maxvif; i++) {
1311                         if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1312                              !(flags & MRT_FLUSH_VIFS_STATIC)) ||
1313                             (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS)))
1314                                 continue;
1315                         vif_delete(mrt, i, 0, &list);
1316                 }
1317                 unregister_netdevice_many(&list);
1318         }
1319
1320         /* Wipe the cache */
1321         if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) {
1322                 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1323                         if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) ||
1324                             (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC)))
1325                                 continue;
1326                         rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1327                         list_del_rcu(&c->list);
1328                         cache = (struct mfc_cache *)c;
1329                         call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache,
1330                                                       mrt->id);
1331                         mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1332                         mr_cache_put(c);
1333                 }
1334         }
1335
1336         if (flags & MRT_FLUSH_MFC) {
1337                 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1338                         spin_lock_bh(&mfc_unres_lock);
1339                         list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1340                                 list_del(&c->list);
1341                                 cache = (struct mfc_cache *)c;
1342                                 mroute_netlink_event(mrt, cache, RTM_DELROUTE);
1343                                 ipmr_destroy_unres(mrt, cache);
1344                         }
1345                         spin_unlock_bh(&mfc_unres_lock);
1346                 }
1347         }
1348 }
1349
1350 /* called from ip_ra_control(), before an RCU grace period,
1351  * we dont need to call synchronize_rcu() here
1352  */
1353 static void mrtsock_destruct(struct sock *sk)
1354 {
1355         struct net *net = sock_net(sk);
1356         struct mr_table *mrt;
1357
1358         rtnl_lock();
1359         ipmr_for_each_table(mrt, net) {
1360                 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1361                         IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1362                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1363                                                     NETCONFA_MC_FORWARDING,
1364                                                     NETCONFA_IFINDEX_ALL,
1365                                                     net->ipv4.devconf_all);
1366                         RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1367                         mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC);
1368                 }
1369         }
1370         rtnl_unlock();
1371 }
1372
1373 /* Socket options and virtual interface manipulation. The whole
1374  * virtual interface system is a complete heap, but unfortunately
1375  * that's how BSD mrouted happens to think. Maybe one day with a proper
1376  * MOSPF/PIM router set up we can clean this up.
1377  */
1378
1379 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
1380                          unsigned int optlen)
1381 {
1382         struct net *net = sock_net(sk);
1383         int val, ret = 0, parent = 0;
1384         struct mr_table *mrt;
1385         struct vifctl vif;
1386         struct mfcctl mfc;
1387         bool do_wrvifwhole;
1388         u32 uval;
1389
1390         /* There's one exception to the lock - MRT_DONE which needs to unlock */
1391         rtnl_lock();
1392         if (sk->sk_type != SOCK_RAW ||
1393             inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1394                 ret = -EOPNOTSUPP;
1395                 goto out_unlock;
1396         }
1397
1398         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1399         if (!mrt) {
1400                 ret = -ENOENT;
1401                 goto out_unlock;
1402         }
1403         if (optname != MRT_INIT) {
1404                 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1405                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1406                         ret = -EACCES;
1407                         goto out_unlock;
1408                 }
1409         }
1410
1411         switch (optname) {
1412         case MRT_INIT:
1413                 if (optlen != sizeof(int)) {
1414                         ret = -EINVAL;
1415                         break;
1416                 }
1417                 if (rtnl_dereference(mrt->mroute_sk)) {
1418                         ret = -EADDRINUSE;
1419                         break;
1420                 }
1421
1422                 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1423                 if (ret == 0) {
1424                         rcu_assign_pointer(mrt->mroute_sk, sk);
1425                         IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1426                         inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1427                                                     NETCONFA_MC_FORWARDING,
1428                                                     NETCONFA_IFINDEX_ALL,
1429                                                     net->ipv4.devconf_all);
1430                 }
1431                 break;
1432         case MRT_DONE:
1433                 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1434                         ret = -EACCES;
1435                 } else {
1436                         /* We need to unlock here because mrtsock_destruct takes
1437                          * care of rtnl itself and we can't change that due to
1438                          * the IP_ROUTER_ALERT setsockopt which runs without it.
1439                          */
1440                         rtnl_unlock();
1441                         ret = ip_ra_control(sk, 0, NULL);
1442                         goto out;
1443                 }
1444                 break;
1445         case MRT_ADD_VIF:
1446         case MRT_DEL_VIF:
1447                 if (optlen != sizeof(vif)) {
1448                         ret = -EINVAL;
1449                         break;
1450                 }
1451                 if (copy_from_user(&vif, optval, sizeof(vif))) {
1452                         ret = -EFAULT;
1453                         break;
1454                 }
1455                 if (vif.vifc_vifi >= MAXVIFS) {
1456                         ret = -ENFILE;
1457                         break;
1458                 }
1459                 if (optname == MRT_ADD_VIF) {
1460                         ret = vif_add(net, mrt, &vif,
1461                                       sk == rtnl_dereference(mrt->mroute_sk));
1462                 } else {
1463                         ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1464                 }
1465                 break;
1466         /* Manipulate the forwarding caches. These live
1467          * in a sort of kernel/user symbiosis.
1468          */
1469         case MRT_ADD_MFC:
1470         case MRT_DEL_MFC:
1471                 parent = -1;
1472                 /* fall through */
1473         case MRT_ADD_MFC_PROXY:
1474         case MRT_DEL_MFC_PROXY:
1475                 if (optlen != sizeof(mfc)) {
1476                         ret = -EINVAL;
1477                         break;
1478                 }
1479                 if (copy_from_user(&mfc, optval, sizeof(mfc))) {
1480                         ret = -EFAULT;
1481                         break;
1482                 }
1483                 if (parent == 0)
1484                         parent = mfc.mfcc_parent;
1485                 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1486                         ret = ipmr_mfc_delete(mrt, &mfc, parent);
1487                 else
1488                         ret = ipmr_mfc_add(net, mrt, &mfc,
1489                                            sk == rtnl_dereference(mrt->mroute_sk),
1490                                            parent);
1491                 break;
1492         case MRT_FLUSH:
1493                 if (optlen != sizeof(val)) {
1494                         ret = -EINVAL;
1495                         break;
1496                 }
1497                 if (get_user(val, (int __user *)optval)) {
1498                         ret = -EFAULT;
1499                         break;
1500                 }
1501                 mroute_clean_tables(mrt, val);
1502                 break;
1503         /* Control PIM assert. */
1504         case MRT_ASSERT:
1505                 if (optlen != sizeof(val)) {
1506                         ret = -EINVAL;
1507                         break;
1508                 }
1509                 if (get_user(val, (int __user *)optval)) {
1510                         ret = -EFAULT;
1511                         break;
1512                 }
1513                 mrt->mroute_do_assert = val;
1514                 break;
1515         case MRT_PIM:
1516                 if (!ipmr_pimsm_enabled()) {
1517                         ret = -ENOPROTOOPT;
1518                         break;
1519                 }
1520                 if (optlen != sizeof(val)) {
1521                         ret = -EINVAL;
1522                         break;
1523                 }
1524                 if (get_user(val, (int __user *)optval)) {
1525                         ret = -EFAULT;
1526                         break;
1527                 }
1528
1529                 do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE);
1530                 val = !!val;
1531                 if (val != mrt->mroute_do_pim) {
1532                         mrt->mroute_do_pim = val;
1533                         mrt->mroute_do_assert = val;
1534                         mrt->mroute_do_wrvifwhole = do_wrvifwhole;
1535                 }
1536                 break;
1537         case MRT_TABLE:
1538                 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1539                         ret = -ENOPROTOOPT;
1540                         break;
1541                 }
1542                 if (optlen != sizeof(uval)) {
1543                         ret = -EINVAL;
1544                         break;
1545                 }
1546                 if (get_user(uval, (u32 __user *)optval)) {
1547                         ret = -EFAULT;
1548                         break;
1549                 }
1550
1551                 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1552                         ret = -EBUSY;
1553                 } else {
1554                         mrt = ipmr_new_table(net, uval);
1555                         if (IS_ERR(mrt))
1556                                 ret = PTR_ERR(mrt);
1557                         else
1558                                 raw_sk(sk)->ipmr_table = uval;
1559                 }
1560                 break;
1561         /* Spurious command, or MRT_VERSION which you cannot set. */
1562         default:
1563                 ret = -ENOPROTOOPT;
1564         }
1565 out_unlock:
1566         rtnl_unlock();
1567 out:
1568         return ret;
1569 }
1570
1571 /* Getsock opt support for the multicast routing system. */
1572 int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1573 {
1574         int olr;
1575         int val;
1576         struct net *net = sock_net(sk);
1577         struct mr_table *mrt;
1578
1579         if (sk->sk_type != SOCK_RAW ||
1580             inet_sk(sk)->inet_num != IPPROTO_IGMP)
1581                 return -EOPNOTSUPP;
1582
1583         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1584         if (!mrt)
1585                 return -ENOENT;
1586
1587         switch (optname) {
1588         case MRT_VERSION:
1589                 val = 0x0305;
1590                 break;
1591         case MRT_PIM:
1592                 if (!ipmr_pimsm_enabled())
1593                         return -ENOPROTOOPT;
1594                 val = mrt->mroute_do_pim;
1595                 break;
1596         case MRT_ASSERT:
1597                 val = mrt->mroute_do_assert;
1598                 break;
1599         default:
1600                 return -ENOPROTOOPT;
1601         }
1602
1603         if (get_user(olr, optlen))
1604                 return -EFAULT;
1605         olr = min_t(unsigned int, olr, sizeof(int));
1606         if (olr < 0)
1607                 return -EINVAL;
1608         if (put_user(olr, optlen))
1609                 return -EFAULT;
1610         if (copy_to_user(optval, &val, olr))
1611                 return -EFAULT;
1612         return 0;
1613 }
1614
1615 /* The IP multicast ioctl support routines. */
1616 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1617 {
1618         struct sioc_sg_req sr;
1619         struct sioc_vif_req vr;
1620         struct vif_device *vif;
1621         struct mfc_cache *c;
1622         struct net *net = sock_net(sk);
1623         struct mr_table *mrt;
1624
1625         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1626         if (!mrt)
1627                 return -ENOENT;
1628
1629         switch (cmd) {
1630         case SIOCGETVIFCNT:
1631                 if (copy_from_user(&vr, arg, sizeof(vr)))
1632                         return -EFAULT;
1633                 if (vr.vifi >= mrt->maxvif)
1634                         return -EINVAL;
1635                 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1636                 read_lock(&mrt_lock);
1637                 vif = &mrt->vif_table[vr.vifi];
1638                 if (VIF_EXISTS(mrt, vr.vifi)) {
1639                         vr.icount = vif->pkt_in;
1640                         vr.ocount = vif->pkt_out;
1641                         vr.ibytes = vif->bytes_in;
1642                         vr.obytes = vif->bytes_out;
1643                         read_unlock(&mrt_lock);
1644
1645                         if (copy_to_user(arg, &vr, sizeof(vr)))
1646                                 return -EFAULT;
1647                         return 0;
1648                 }
1649                 read_unlock(&mrt_lock);
1650                 return -EADDRNOTAVAIL;
1651         case SIOCGETSGCNT:
1652                 if (copy_from_user(&sr, arg, sizeof(sr)))
1653                         return -EFAULT;
1654
1655                 rcu_read_lock();
1656                 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1657                 if (c) {
1658                         sr.pktcnt = c->_c.mfc_un.res.pkt;
1659                         sr.bytecnt = c->_c.mfc_un.res.bytes;
1660                         sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1661                         rcu_read_unlock();
1662
1663                         if (copy_to_user(arg, &sr, sizeof(sr)))
1664                                 return -EFAULT;
1665                         return 0;
1666                 }
1667                 rcu_read_unlock();
1668                 return -EADDRNOTAVAIL;
1669         default:
1670                 return -ENOIOCTLCMD;
1671         }
1672 }
1673
1674 #ifdef CONFIG_COMPAT
1675 struct compat_sioc_sg_req {
1676         struct in_addr src;
1677         struct in_addr grp;
1678         compat_ulong_t pktcnt;
1679         compat_ulong_t bytecnt;
1680         compat_ulong_t wrong_if;
1681 };
1682
1683 struct compat_sioc_vif_req {
1684         vifi_t  vifi;           /* Which iface */
1685         compat_ulong_t icount;
1686         compat_ulong_t ocount;
1687         compat_ulong_t ibytes;
1688         compat_ulong_t obytes;
1689 };
1690
1691 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1692 {
1693         struct compat_sioc_sg_req sr;
1694         struct compat_sioc_vif_req vr;
1695         struct vif_device *vif;
1696         struct mfc_cache *c;
1697         struct net *net = sock_net(sk);
1698         struct mr_table *mrt;
1699
1700         mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1701         if (!mrt)
1702                 return -ENOENT;
1703
1704         switch (cmd) {
1705         case SIOCGETVIFCNT:
1706                 if (copy_from_user(&vr, arg, sizeof(vr)))
1707                         return -EFAULT;
1708                 if (vr.vifi >= mrt->maxvif)
1709                         return -EINVAL;
1710                 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1711                 read_lock(&mrt_lock);
1712                 vif = &mrt->vif_table[vr.vifi];
1713                 if (VIF_EXISTS(mrt, vr.vifi)) {
1714                         vr.icount = vif->pkt_in;
1715                         vr.ocount = vif->pkt_out;
1716                         vr.ibytes = vif->bytes_in;
1717                         vr.obytes = vif->bytes_out;
1718                         read_unlock(&mrt_lock);
1719
1720                         if (copy_to_user(arg, &vr, sizeof(vr)))
1721                                 return -EFAULT;
1722                         return 0;
1723                 }
1724                 read_unlock(&mrt_lock);
1725                 return -EADDRNOTAVAIL;
1726         case SIOCGETSGCNT:
1727                 if (copy_from_user(&sr, arg, sizeof(sr)))
1728                         return -EFAULT;
1729
1730                 rcu_read_lock();
1731                 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1732                 if (c) {
1733                         sr.pktcnt = c->_c.mfc_un.res.pkt;
1734                         sr.bytecnt = c->_c.mfc_un.res.bytes;
1735                         sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1736                         rcu_read_unlock();
1737
1738                         if (copy_to_user(arg, &sr, sizeof(sr)))
1739                                 return -EFAULT;
1740                         return 0;
1741                 }
1742                 rcu_read_unlock();
1743                 return -EADDRNOTAVAIL;
1744         default:
1745                 return -ENOIOCTLCMD;
1746         }
1747 }
1748 #endif
1749
1750 static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1751 {
1752         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1753         struct net *net = dev_net(dev);
1754         struct mr_table *mrt;
1755         struct vif_device *v;
1756         int ct;
1757
1758         if (event != NETDEV_UNREGISTER)
1759                 return NOTIFY_DONE;
1760
1761         ipmr_for_each_table(mrt, net) {
1762                 v = &mrt->vif_table[0];
1763                 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1764                         if (v->dev == dev)
1765                                 vif_delete(mrt, ct, 1, NULL);
1766                 }
1767         }
1768         return NOTIFY_DONE;
1769 }
1770
1771 static struct notifier_block ip_mr_notifier = {
1772         .notifier_call = ipmr_device_event,
1773 };
1774
1775 /* Encapsulate a packet by attaching a valid IPIP header to it.
1776  * This avoids tunnel drivers and other mess and gives us the speed so
1777  * important for multicast video.
1778  */
1779 static void ip_encap(struct net *net, struct sk_buff *skb,
1780                      __be32 saddr, __be32 daddr)
1781 {
1782         struct iphdr *iph;
1783         const struct iphdr *old_iph = ip_hdr(skb);
1784
1785         skb_push(skb, sizeof(struct iphdr));
1786         skb->transport_header = skb->network_header;
1787         skb_reset_network_header(skb);
1788         iph = ip_hdr(skb);
1789
1790         iph->version    =       4;
1791         iph->tos        =       old_iph->tos;
1792         iph->ttl        =       old_iph->ttl;
1793         iph->frag_off   =       0;
1794         iph->daddr      =       daddr;
1795         iph->saddr      =       saddr;
1796         iph->protocol   =       IPPROTO_IPIP;
1797         iph->ihl        =       5;
1798         iph->tot_len    =       htons(skb->len);
1799         ip_select_ident(net, skb, NULL);
1800         ip_send_check(iph);
1801
1802         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1803         nf_reset(skb);
1804 }
1805
1806 static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1807                                       struct sk_buff *skb)
1808 {
1809         struct ip_options *opt = &(IPCB(skb)->opt);
1810
1811         IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1812         IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1813
1814         if (unlikely(opt->optlen))
1815                 ip_forward_options(skb);
1816
1817         return dst_output(net, sk, skb);
1818 }
1819
1820 #ifdef CONFIG_NET_SWITCHDEV
1821 static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1822                                    int in_vifi, int out_vifi)
1823 {
1824         struct vif_device *out_vif = &mrt->vif_table[out_vifi];
1825         struct vif_device *in_vif = &mrt->vif_table[in_vifi];
1826
1827         if (!skb->offload_l3_fwd_mark)
1828                 return false;
1829         if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len)
1830                 return false;
1831         return netdev_phys_item_id_same(&out_vif->dev_parent_id,
1832                                         &in_vif->dev_parent_id);
1833 }
1834 #else
1835 static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
1836                                    int in_vifi, int out_vifi)
1837 {
1838         return false;
1839 }
1840 #endif
1841
1842 /* Processing handlers for ipmr_forward */
1843
1844 static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1845                             int in_vifi, struct sk_buff *skb, int vifi)
1846 {
1847         const struct iphdr *iph = ip_hdr(skb);
1848         struct vif_device *vif = &mrt->vif_table[vifi];
1849         struct net_device *dev;
1850         struct rtable *rt;
1851         struct flowi4 fl4;
1852         int    encap = 0;
1853
1854         if (!vif->dev)
1855                 goto out_free;
1856
1857         if (vif->flags & VIFF_REGISTER) {
1858                 vif->pkt_out++;
1859                 vif->bytes_out += skb->len;
1860                 vif->dev->stats.tx_bytes += skb->len;
1861                 vif->dev->stats.tx_packets++;
1862                 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1863                 goto out_free;
1864         }
1865
1866         if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi))
1867                 goto out_free;
1868
1869         if (vif->flags & VIFF_TUNNEL) {
1870                 rt = ip_route_output_ports(net, &fl4, NULL,
1871                                            vif->remote, vif->local,
1872                                            0, 0,
1873                                            IPPROTO_IPIP,
1874                                            RT_TOS(iph->tos), vif->link);
1875                 if (IS_ERR(rt))
1876                         goto out_free;
1877                 encap = sizeof(struct iphdr);
1878         } else {
1879                 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1880                                            0, 0,
1881                                            IPPROTO_IPIP,
1882                                            RT_TOS(iph->tos), vif->link);
1883                 if (IS_ERR(rt))
1884                         goto out_free;
1885         }
1886
1887         dev = rt->dst.dev;
1888
1889         if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1890                 /* Do not fragment multicasts. Alas, IPv4 does not
1891                  * allow to send ICMP, so that packets will disappear
1892                  * to blackhole.
1893                  */
1894                 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1895                 ip_rt_put(rt);
1896                 goto out_free;
1897         }
1898
1899         encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1900
1901         if (skb_cow(skb, encap)) {
1902                 ip_rt_put(rt);
1903                 goto out_free;
1904         }
1905
1906         vif->pkt_out++;
1907         vif->bytes_out += skb->len;
1908
1909         skb_dst_drop(skb);
1910         skb_dst_set(skb, &rt->dst);
1911         ip_decrease_ttl(ip_hdr(skb));
1912
1913         /* FIXME: forward and output firewalls used to be called here.
1914          * What do we do with netfilter? -- RR
1915          */
1916         if (vif->flags & VIFF_TUNNEL) {
1917                 ip_encap(net, skb, vif->local, vif->remote);
1918                 /* FIXME: extra output firewall step used to be here. --RR */
1919                 vif->dev->stats.tx_packets++;
1920                 vif->dev->stats.tx_bytes += skb->len;
1921         }
1922
1923         IPCB(skb)->flags |= IPSKB_FORWARDED;
1924
1925         /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1926          * not only before forwarding, but after forwarding on all output
1927          * interfaces. It is clear, if mrouter runs a multicasting
1928          * program, it should receive packets not depending to what interface
1929          * program is joined.
1930          * If we will not make it, the program will have to join on all
1931          * interfaces. On the other hand, multihoming host (or router, but
1932          * not mrouter) cannot join to more than one interface - it will
1933          * result in receiving multiple packets.
1934          */
1935         NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1936                 net, NULL, skb, skb->dev, dev,
1937                 ipmr_forward_finish);
1938         return;
1939
1940 out_free:
1941         kfree_skb(skb);
1942 }
1943
1944 static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1945 {
1946         int ct;
1947
1948         for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1949                 if (mrt->vif_table[ct].dev == dev)
1950                         break;
1951         }
1952         return ct;
1953 }
1954
1955 /* "local" means that we should preserve one skb (for local delivery) */
1956 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
1957                           struct net_device *dev, struct sk_buff *skb,
1958                           struct mfc_cache *c, int local)
1959 {
1960         int true_vifi = ipmr_find_vif(mrt, dev);
1961         int psend = -1;
1962         int vif, ct;
1963
1964         vif = c->_c.mfc_parent;
1965         c->_c.mfc_un.res.pkt++;
1966         c->_c.mfc_un.res.bytes += skb->len;
1967         c->_c.mfc_un.res.lastuse = jiffies;
1968
1969         if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1970                 struct mfc_cache *cache_proxy;
1971
1972                 /* For an (*,G) entry, we only check that the incomming
1973                  * interface is part of the static tree.
1974                  */
1975                 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
1976                 if (cache_proxy &&
1977                     cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255)
1978                         goto forward;
1979         }
1980
1981         /* Wrong interface: drop packet and (maybe) send PIM assert. */
1982         if (mrt->vif_table[vif].dev != dev) {
1983                 if (rt_is_output_route(skb_rtable(skb))) {
1984                         /* It is our own packet, looped back.
1985                          * Very complicated situation...
1986                          *
1987                          * The best workaround until routing daemons will be
1988                          * fixed is not to redistribute packet, if it was
1989                          * send through wrong interface. It means, that
1990                          * multicast applications WILL NOT work for
1991                          * (S,G), which have default multicast route pointing
1992                          * to wrong oif. In any case, it is not a good
1993                          * idea to use multicasting applications on router.
1994                          */
1995                         goto dont_forward;
1996                 }
1997
1998                 c->_c.mfc_un.res.wrong_if++;
1999
2000                 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2001                     /* pimsm uses asserts, when switching from RPT to SPT,
2002                      * so that we cannot check that packet arrived on an oif.
2003                      * It is bad, but otherwise we would need to move pretty
2004                      * large chunk of pimd to kernel. Ough... --ANK
2005                      */
2006                     (mrt->mroute_do_pim ||
2007                      c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2008                     time_after(jiffies,
2009                                c->_c.mfc_un.res.last_assert +
2010                                MFC_ASSERT_THRESH)) {
2011                         c->_c.mfc_un.res.last_assert = jiffies;
2012                         ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
2013                         if (mrt->mroute_do_wrvifwhole)
2014                                 ipmr_cache_report(mrt, skb, true_vifi,
2015                                                   IGMPMSG_WRVIFWHOLE);
2016                 }
2017                 goto dont_forward;
2018         }
2019
2020 forward:
2021         mrt->vif_table[vif].pkt_in++;
2022         mrt->vif_table[vif].bytes_in += skb->len;
2023
2024         /* Forward the frame */
2025         if (c->mfc_origin == htonl(INADDR_ANY) &&
2026             c->mfc_mcastgrp == htonl(INADDR_ANY)) {
2027                 if (true_vifi >= 0 &&
2028                     true_vifi != c->_c.mfc_parent &&
2029                     ip_hdr(skb)->ttl >
2030                                 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2031                         /* It's an (*,*) entry and the packet is not coming from
2032                          * the upstream: forward the packet to the upstream
2033                          * only.
2034                          */
2035                         psend = c->_c.mfc_parent;
2036                         goto last_forward;
2037                 }
2038                 goto dont_forward;
2039         }
2040         for (ct = c->_c.mfc_un.res.maxvif - 1;
2041              ct >= c->_c.mfc_un.res.minvif; ct--) {
2042                 /* For (*,G) entry, don't forward to the incoming interface */
2043                 if ((c->mfc_origin != htonl(INADDR_ANY) ||
2044                      ct != true_vifi) &&
2045                     ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) {
2046                         if (psend != -1) {
2047                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2048
2049                                 if (skb2)
2050                                         ipmr_queue_xmit(net, mrt, true_vifi,
2051                                                         skb2, psend);
2052                         }
2053                         psend = ct;
2054                 }
2055         }
2056 last_forward:
2057         if (psend != -1) {
2058                 if (local) {
2059                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2060
2061                         if (skb2)
2062                                 ipmr_queue_xmit(net, mrt, true_vifi, skb2,
2063                                                 psend);
2064                 } else {
2065                         ipmr_queue_xmit(net, mrt, true_vifi, skb, psend);
2066                         return;
2067                 }
2068         }
2069
2070 dont_forward:
2071         if (!local)
2072                 kfree_skb(skb);
2073 }
2074
2075 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
2076 {
2077         struct rtable *rt = skb_rtable(skb);
2078         struct iphdr *iph = ip_hdr(skb);
2079         struct flowi4 fl4 = {
2080                 .daddr = iph->daddr,
2081                 .saddr = iph->saddr,
2082                 .flowi4_tos = RT_TOS(iph->tos),
2083                 .flowi4_oif = (rt_is_output_route(rt) ?
2084                                skb->dev->ifindex : 0),
2085                 .flowi4_iif = (rt_is_output_route(rt) ?
2086                                LOOPBACK_IFINDEX :
2087                                skb->dev->ifindex),
2088                 .flowi4_mark = skb->mark,
2089         };
2090         struct mr_table *mrt;
2091         int err;
2092
2093         err = ipmr_fib_lookup(net, &fl4, &mrt);
2094         if (err)
2095                 return ERR_PTR(err);
2096         return mrt;
2097 }
2098
2099 /* Multicast packets for forwarding arrive here
2100  * Called with rcu_read_lock();
2101  */
2102 int ip_mr_input(struct sk_buff *skb)
2103 {
2104         struct mfc_cache *cache;
2105         struct net *net = dev_net(skb->dev);
2106         int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
2107         struct mr_table *mrt;
2108         struct net_device *dev;
2109
2110         /* skb->dev passed in is the loX master dev for vrfs.
2111          * As there are no vifs associated with loopback devices,
2112          * get the proper interface that does have a vif associated with it.
2113          */
2114         dev = skb->dev;
2115         if (netif_is_l3_master(skb->dev)) {
2116                 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2117                 if (!dev) {
2118                         kfree_skb(skb);
2119                         return -ENODEV;
2120                 }
2121         }
2122
2123         /* Packet is looped back after forward, it should not be
2124          * forwarded second time, but still can be delivered locally.
2125          */
2126         if (IPCB(skb)->flags & IPSKB_FORWARDED)
2127                 goto dont_forward;
2128
2129         mrt = ipmr_rt_fib_lookup(net, skb);
2130         if (IS_ERR(mrt)) {
2131                 kfree_skb(skb);
2132                 return PTR_ERR(mrt);
2133         }
2134         if (!local) {
2135                 if (IPCB(skb)->opt.router_alert) {
2136                         if (ip_call_ra_chain(skb))
2137                                 return 0;
2138                 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2139                         /* IGMPv1 (and broken IGMPv2 implementations sort of
2140                          * Cisco IOS <= 11.2(8)) do not put router alert
2141                          * option to IGMP packets destined to routable
2142                          * groups. It is very bad, because it means
2143                          * that we can forward NO IGMP messages.
2144                          */
2145                         struct sock *mroute_sk;
2146
2147                         mroute_sk = rcu_dereference(mrt->mroute_sk);
2148                         if (mroute_sk) {
2149                                 nf_reset(skb);
2150                                 raw_rcv(mroute_sk, skb);
2151                                 return 0;
2152                         }
2153                     }
2154         }
2155
2156         /* already under rcu_read_lock() */
2157         cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
2158         if (!cache) {
2159                 int vif = ipmr_find_vif(mrt, dev);
2160
2161                 if (vif >= 0)
2162                         cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2163                                                     vif);
2164         }
2165
2166         /* No usable cache entry */
2167         if (!cache) {
2168                 int vif;
2169
2170                 if (local) {
2171                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2172                         ip_local_deliver(skb);
2173                         if (!skb2)
2174                                 return -ENOBUFS;
2175                         skb = skb2;
2176                 }
2177
2178                 read_lock(&mrt_lock);
2179                 vif = ipmr_find_vif(mrt, dev);
2180                 if (vif >= 0) {
2181                         int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev);
2182                         read_unlock(&mrt_lock);
2183
2184                         return err2;
2185                 }
2186                 read_unlock(&mrt_lock);
2187                 kfree_skb(skb);
2188                 return -ENODEV;
2189         }
2190
2191         read_lock(&mrt_lock);
2192         ip_mr_forward(net, mrt, dev, skb, cache, local);
2193         read_unlock(&mrt_lock);
2194
2195         if (local)
2196                 return ip_local_deliver(skb);
2197
2198         return 0;
2199
2200 dont_forward:
2201         if (local)
2202                 return ip_local_deliver(skb);
2203         kfree_skb(skb);
2204         return 0;
2205 }
2206
2207 #ifdef CONFIG_IP_PIMSM_V1
2208 /* Handle IGMP messages of PIMv1 */
2209 int pim_rcv_v1(struct sk_buff *skb)
2210 {
2211         struct igmphdr *pim;
2212         struct net *net = dev_net(skb->dev);
2213         struct mr_table *mrt;
2214
2215         if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2216                 goto drop;
2217
2218         pim = igmp_hdr(skb);
2219
2220         mrt = ipmr_rt_fib_lookup(net, skb);
2221         if (IS_ERR(mrt))
2222                 goto drop;
2223         if (!mrt->mroute_do_pim ||
2224             pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2225                 goto drop;
2226
2227         if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2228 drop:
2229                 kfree_skb(skb);
2230         }
2231         return 0;
2232 }
2233 #endif
2234
2235 #ifdef CONFIG_IP_PIMSM_V2
2236 static int pim_rcv(struct sk_buff *skb)
2237 {
2238         struct pimreghdr *pim;
2239         struct net *net = dev_net(skb->dev);
2240         struct mr_table *mrt;
2241
2242         if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2243                 goto drop;
2244
2245         pim = (struct pimreghdr *)skb_transport_header(skb);
2246         if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
2247             (pim->flags & PIM_NULL_REGISTER) ||
2248             (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2249              csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2250                 goto drop;
2251
2252         mrt = ipmr_rt_fib_lookup(net, skb);
2253         if (IS_ERR(mrt))
2254                 goto drop;
2255         if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2256 drop:
2257                 kfree_skb(skb);
2258         }
2259         return 0;
2260 }
2261 #endif
2262
2263 int ipmr_get_route(struct net *net, struct sk_buff *skb,
2264                    __be32 saddr, __be32 daddr,
2265                    struct rtmsg *rtm, u32 portid)
2266 {
2267         struct mfc_cache *cache;
2268         struct mr_table *mrt;
2269         int err;
2270
2271         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2272         if (!mrt)
2273                 return -ENOENT;
2274
2275         rcu_read_lock();
2276         cache = ipmr_cache_find(mrt, saddr, daddr);
2277         if (!cache && skb->dev) {
2278                 int vif = ipmr_find_vif(mrt, skb->dev);
2279
2280                 if (vif >= 0)
2281                         cache = ipmr_cache_find_any(mrt, daddr, vif);
2282         }
2283         if (!cache) {
2284                 struct sk_buff *skb2;
2285                 struct iphdr *iph;
2286                 struct net_device *dev;
2287                 int vif = -1;
2288
2289                 dev = skb->dev;
2290                 read_lock(&mrt_lock);
2291                 if (dev)
2292                         vif = ipmr_find_vif(mrt, dev);
2293                 if (vif < 0) {
2294                         read_unlock(&mrt_lock);
2295                         rcu_read_unlock();
2296                         return -ENODEV;
2297                 }
2298                 skb2 = skb_clone(skb, GFP_ATOMIC);
2299                 if (!skb2) {
2300                         read_unlock(&mrt_lock);
2301                         rcu_read_unlock();
2302                         return -ENOMEM;
2303                 }
2304
2305                 NETLINK_CB(skb2).portid = portid;
2306                 skb_push(skb2, sizeof(struct iphdr));
2307                 skb_reset_network_header(skb2);
2308                 iph = ip_hdr(skb2);
2309                 iph->ihl = sizeof(struct iphdr) >> 2;
2310                 iph->saddr = saddr;
2311                 iph->daddr = daddr;
2312                 iph->version = 0;
2313                 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
2314                 read_unlock(&mrt_lock);
2315                 rcu_read_unlock();
2316                 return err;
2317         }
2318
2319         read_lock(&mrt_lock);
2320         err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2321         read_unlock(&mrt_lock);
2322         rcu_read_unlock();
2323         return err;
2324 }
2325
2326 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2327                             u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2328                             int flags)
2329 {
2330         struct nlmsghdr *nlh;
2331         struct rtmsg *rtm;
2332         int err;
2333
2334         nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2335         if (!nlh)
2336                 return -EMSGSIZE;
2337
2338         rtm = nlmsg_data(nlh);
2339         rtm->rtm_family   = RTNL_FAMILY_IPMR;
2340         rtm->rtm_dst_len  = 32;
2341         rtm->rtm_src_len  = 32;
2342         rtm->rtm_tos      = 0;
2343         rtm->rtm_table    = mrt->id;
2344         if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2345                 goto nla_put_failure;
2346         rtm->rtm_type     = RTN_MULTICAST;
2347         rtm->rtm_scope    = RT_SCOPE_UNIVERSE;
2348         if (c->_c.mfc_flags & MFC_STATIC)
2349                 rtm->rtm_protocol = RTPROT_STATIC;
2350         else
2351                 rtm->rtm_protocol = RTPROT_MROUTED;
2352         rtm->rtm_flags    = 0;
2353
2354         if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2355             nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
2356                 goto nla_put_failure;
2357         err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2358         /* do not break the dump if cache is unresolved */
2359         if (err < 0 && err != -ENOENT)
2360                 goto nla_put_failure;
2361
2362         nlmsg_end(skb, nlh);
2363         return 0;
2364
2365 nla_put_failure:
2366         nlmsg_cancel(skb, nlh);
2367         return -EMSGSIZE;
2368 }
2369
2370 static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2371                              u32 portid, u32 seq, struct mr_mfc *c, int cmd,
2372                              int flags)
2373 {
2374         return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c,
2375                                 cmd, flags);
2376 }
2377
2378 static size_t mroute_msgsize(bool unresolved, int maxvif)
2379 {
2380         size_t len =
2381                 NLMSG_ALIGN(sizeof(struct rtmsg))
2382                 + nla_total_size(4)     /* RTA_TABLE */
2383                 + nla_total_size(4)     /* RTA_SRC */
2384                 + nla_total_size(4)     /* RTA_DST */
2385                 ;
2386
2387         if (!unresolved)
2388                 len = len
2389                       + nla_total_size(4)       /* RTA_IIF */
2390                       + nla_total_size(0)       /* RTA_MULTIPATH */
2391                       + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2392                                                 /* RTA_MFC_STATS */
2393                       + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2394                 ;
2395
2396         return len;
2397 }
2398
2399 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2400                                  int cmd)
2401 {
2402         struct net *net = read_pnet(&mrt->net);
2403         struct sk_buff *skb;
2404         int err = -ENOBUFS;
2405
2406         skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS,
2407                                        mrt->maxvif),
2408                         GFP_ATOMIC);
2409         if (!skb)
2410                 goto errout;
2411
2412         err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2413         if (err < 0)
2414                 goto errout;
2415
2416         rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2417         return;
2418
2419 errout:
2420         kfree_skb(skb);
2421         if (err < 0)
2422                 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2423 }
2424
2425 static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2426 {
2427         size_t len =
2428                 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2429                 + nla_total_size(1)     /* IPMRA_CREPORT_MSGTYPE */
2430                 + nla_total_size(4)     /* IPMRA_CREPORT_VIF_ID */
2431                 + nla_total_size(4)     /* IPMRA_CREPORT_SRC_ADDR */
2432                 + nla_total_size(4)     /* IPMRA_CREPORT_DST_ADDR */
2433                                         /* IPMRA_CREPORT_PKT */
2434                 + nla_total_size(payloadlen)
2435                 ;
2436
2437         return len;
2438 }
2439
2440 static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2441 {
2442         struct net *net = read_pnet(&mrt->net);
2443         struct nlmsghdr *nlh;
2444         struct rtgenmsg *rtgenm;
2445         struct igmpmsg *msg;
2446         struct sk_buff *skb;
2447         struct nlattr *nla;
2448         int payloadlen;
2449
2450         payloadlen = pkt->len - sizeof(struct igmpmsg);
2451         msg = (struct igmpmsg *)skb_network_header(pkt);
2452
2453         skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2454         if (!skb)
2455                 goto errout;
2456
2457         nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2458                         sizeof(struct rtgenmsg), 0);
2459         if (!nlh)
2460                 goto errout;
2461         rtgenm = nlmsg_data(nlh);
2462         rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2463         if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
2464             nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) ||
2465             nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2466                             msg->im_src.s_addr) ||
2467             nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
2468                             msg->im_dst.s_addr))
2469                 goto nla_put_failure;
2470
2471         nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2472         if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2473                                   nla_data(nla), payloadlen))
2474                 goto nla_put_failure;
2475
2476         nlmsg_end(skb, nlh);
2477
2478         rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2479         return;
2480
2481 nla_put_failure:
2482         nlmsg_cancel(skb, nlh);
2483 errout:
2484         kfree_skb(skb);
2485         rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2486 }
2487
2488 static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
2489                                        const struct nlmsghdr *nlh,
2490                                        struct nlattr **tb,
2491                                        struct netlink_ext_ack *extack)
2492 {
2493         struct rtmsg *rtm;
2494         int i, err;
2495
2496         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
2497                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
2498                 return -EINVAL;
2499         }
2500
2501         if (!netlink_strict_get_check(skb))
2502                 return nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX,
2503                                    rtm_ipv4_policy, extack);
2504
2505         rtm = nlmsg_data(nlh);
2506         if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
2507             (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
2508             rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
2509             rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
2510                 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request");
2511                 return -EINVAL;
2512         }
2513
2514         err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
2515                                  rtm_ipv4_policy, extack);
2516         if (err)
2517                 return err;
2518
2519         if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
2520             (tb[RTA_DST] && !rtm->rtm_dst_len)) {
2521                 NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4");
2522                 return -EINVAL;
2523         }
2524
2525         for (i = 0; i <= RTA_MAX; i++) {
2526                 if (!tb[i])
2527                         continue;
2528
2529                 switch (i) {
2530                 case RTA_SRC:
2531                 case RTA_DST:
2532                 case RTA_TABLE:
2533                         break;
2534                 default:
2535                         NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request");
2536                         return -EINVAL;
2537                 }
2538         }
2539
2540         return 0;
2541 }
2542
2543 static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2544                              struct netlink_ext_ack *extack)
2545 {
2546         struct net *net = sock_net(in_skb->sk);
2547         struct nlattr *tb[RTA_MAX + 1];
2548         struct sk_buff *skb = NULL;
2549         struct mfc_cache *cache;
2550         struct mr_table *mrt;
2551         __be32 src, grp;
2552         u32 tableid;
2553         int err;
2554
2555         err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
2556         if (err < 0)
2557                 goto errout;
2558
2559         src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2560         grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2561         tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2562
2563         mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2564         if (!mrt) {
2565                 err = -ENOENT;
2566                 goto errout_free;
2567         }
2568
2569         /* entries are added/deleted only under RTNL */
2570         rcu_read_lock();
2571         cache = ipmr_cache_find(mrt, src, grp);
2572         rcu_read_unlock();
2573         if (!cache) {
2574                 err = -ENOENT;
2575                 goto errout_free;
2576         }
2577
2578         skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2579         if (!skb) {
2580                 err = -ENOBUFS;
2581                 goto errout_free;
2582         }
2583
2584         err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2585                                nlh->nlmsg_seq, cache,
2586                                RTM_NEWROUTE, 0);
2587         if (err < 0)
2588                 goto errout_free;
2589
2590         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2591
2592 errout:
2593         return err;
2594
2595 errout_free:
2596         kfree_skb(skb);
2597         goto errout;
2598 }
2599
2600 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2601 {
2602         struct fib_dump_filter filter = {};
2603         int err;
2604
2605         if (cb->strict_check) {
2606                 err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh,
2607                                             &filter, cb);
2608                 if (err < 0)
2609                         return err;
2610         }
2611
2612         if (filter.table_id) {
2613                 struct mr_table *mrt;
2614
2615                 mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id);
2616                 if (!mrt) {
2617                         if (filter.dump_all_families)
2618                                 return skb->len;
2619
2620                         NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist");
2621                         return -ENOENT;
2622                 }
2623                 err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute,
2624                                     &mfc_unres_lock, &filter);
2625                 return skb->len ? : err;
2626         }
2627
2628         return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter,
2629                                 _ipmr_fill_mroute, &mfc_unres_lock, &filter);
2630 }
2631
2632 static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2633         [RTA_SRC]       = { .type = NLA_U32 },
2634         [RTA_DST]       = { .type = NLA_U32 },
2635         [RTA_IIF]       = { .type = NLA_U32 },
2636         [RTA_TABLE]     = { .type = NLA_U32 },
2637         [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2638 };
2639
2640 static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2641 {
2642         switch (rtm_protocol) {
2643         case RTPROT_STATIC:
2644         case RTPROT_MROUTED:
2645                 return true;
2646         }
2647         return false;
2648 }
2649
2650 static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2651 {
2652         struct rtnexthop *rtnh = nla_data(nla);
2653         int remaining = nla_len(nla), vifi = 0;
2654
2655         while (rtnh_ok(rtnh, remaining)) {
2656                 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2657                 if (++vifi == MAXVIFS)
2658                         break;
2659                 rtnh = rtnh_next(rtnh, &remaining);
2660         }
2661
2662         return remaining > 0 ? -EINVAL : vifi;
2663 }
2664
2665 /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2666 static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2667                             struct mfcctl *mfcc, int *mrtsock,
2668                             struct mr_table **mrtret,
2669                             struct netlink_ext_ack *extack)
2670 {
2671         struct net_device *dev = NULL;
2672         u32 tblid = RT_TABLE_DEFAULT;
2673         struct mr_table *mrt;
2674         struct nlattr *attr;
2675         struct rtmsg *rtm;
2676         int ret, rem;
2677
2678         ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy,
2679                              extack);
2680         if (ret < 0)
2681                 goto out;
2682         rtm = nlmsg_data(nlh);
2683
2684         ret = -EINVAL;
2685         if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2686             rtm->rtm_type != RTN_MULTICAST ||
2687             rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2688             !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2689                 goto out;
2690
2691         memset(mfcc, 0, sizeof(*mfcc));
2692         mfcc->mfcc_parent = -1;
2693         ret = 0;
2694         nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2695                 switch (nla_type(attr)) {
2696                 case RTA_SRC:
2697                         mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2698                         break;
2699                 case RTA_DST:
2700                         mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2701                         break;
2702                 case RTA_IIF:
2703                         dev = __dev_get_by_index(net, nla_get_u32(attr));
2704                         if (!dev) {
2705                                 ret = -ENODEV;
2706                                 goto out;
2707                         }
2708                         break;
2709                 case RTA_MULTIPATH:
2710                         if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2711                                 ret = -EINVAL;
2712                                 goto out;
2713                         }
2714                         break;
2715                 case RTA_PREFSRC:
2716                         ret = 1;
2717                         break;
2718                 case RTA_TABLE:
2719                         tblid = nla_get_u32(attr);
2720                         break;
2721                 }
2722         }
2723         mrt = ipmr_get_table(net, tblid);
2724         if (!mrt) {
2725                 ret = -ENOENT;
2726                 goto out;
2727         }
2728         *mrtret = mrt;
2729         *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2730         if (dev)
2731                 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2732
2733 out:
2734         return ret;
2735 }
2736
2737 /* takes care of both newroute and delroute */
2738 static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2739                           struct netlink_ext_ack *extack)
2740 {
2741         struct net *net = sock_net(skb->sk);
2742         int ret, mrtsock, parent;
2743         struct mr_table *tbl;
2744         struct mfcctl mfcc;
2745
2746         mrtsock = 0;
2747         tbl = NULL;
2748         ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
2749         if (ret < 0)
2750                 return ret;
2751
2752         parent = ret ? mfcc.mfcc_parent : -1;
2753         if (nlh->nlmsg_type == RTM_NEWROUTE)
2754                 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2755         else
2756                 return ipmr_mfc_delete(tbl, &mfcc, parent);
2757 }
2758
2759 static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2760 {
2761         u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2762
2763         if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2764             nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2765             nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2766                         mrt->mroute_reg_vif_num) ||
2767             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2768                        mrt->mroute_do_assert) ||
2769             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) ||
2770             nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
2771                        mrt->mroute_do_wrvifwhole))
2772                 return false;
2773
2774         return true;
2775 }
2776
2777 static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2778 {
2779         struct nlattr *vif_nest;
2780         struct vif_device *vif;
2781
2782         /* if the VIF doesn't exist just continue */
2783         if (!VIF_EXISTS(mrt, vifid))
2784                 return true;
2785
2786         vif = &mrt->vif_table[vifid];
2787         vif_nest = nla_nest_start(skb, IPMRA_VIF);
2788         if (!vif_nest)
2789                 return false;
2790         if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) ||
2791             nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2792             nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2793             nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2794                               IPMRA_VIFA_PAD) ||
2795             nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2796                               IPMRA_VIFA_PAD) ||
2797             nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2798                               IPMRA_VIFA_PAD) ||
2799             nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2800                               IPMRA_VIFA_PAD) ||
2801             nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2802             nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2803                 nla_nest_cancel(skb, vif_nest);
2804                 return false;
2805         }
2806         nla_nest_end(skb, vif_nest);
2807
2808         return true;
2809 }
2810
2811 static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
2812                                struct netlink_ext_ack *extack)
2813 {
2814         struct ifinfomsg *ifm;
2815
2816         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2817                 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
2818                 return -EINVAL;
2819         }
2820
2821         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
2822                 NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump");
2823                 return -EINVAL;
2824         }
2825
2826         ifm = nlmsg_data(nlh);
2827         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2828             ifm->ifi_change || ifm->ifi_index) {
2829                 NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");
2830                 return -EINVAL;
2831         }
2832
2833         return 0;
2834 }
2835
2836 static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2837 {
2838         struct net *net = sock_net(skb->sk);
2839         struct nlmsghdr *nlh = NULL;
2840         unsigned int t = 0, s_t;
2841         unsigned int e = 0, s_e;
2842         struct mr_table *mrt;
2843
2844         if (cb->strict_check) {
2845                 int err = ipmr_valid_dumplink(cb->nlh, cb->extack);
2846
2847                 if (err < 0)
2848                         return err;
2849         }
2850
2851         s_t = cb->args[0];
2852         s_e = cb->args[1];
2853
2854         ipmr_for_each_table(mrt, net) {
2855                 struct nlattr *vifs, *af;
2856                 struct ifinfomsg *hdr;
2857                 u32 i;
2858
2859                 if (t < s_t)
2860                         goto skip_table;
2861                 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2862                                 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2863                                 sizeof(*hdr), NLM_F_MULTI);
2864                 if (!nlh)
2865                         break;
2866
2867                 hdr = nlmsg_data(nlh);
2868                 memset(hdr, 0, sizeof(*hdr));
2869                 hdr->ifi_family = RTNL_FAMILY_IPMR;
2870
2871                 af = nla_nest_start(skb, IFLA_AF_SPEC);
2872                 if (!af) {
2873                         nlmsg_cancel(skb, nlh);
2874                         goto out;
2875                 }
2876
2877                 if (!ipmr_fill_table(mrt, skb)) {
2878                         nlmsg_cancel(skb, nlh);
2879                         goto out;
2880                 }
2881
2882                 vifs = nla_nest_start(skb, IPMRA_TABLE_VIFS);
2883                 if (!vifs) {
2884                         nla_nest_end(skb, af);
2885                         nlmsg_end(skb, nlh);
2886                         goto out;
2887                 }
2888                 for (i = 0; i < mrt->maxvif; i++) {
2889                         if (e < s_e)
2890                                 goto skip_entry;
2891                         if (!ipmr_fill_vif(mrt, i, skb)) {
2892                                 nla_nest_end(skb, vifs);
2893                                 nla_nest_end(skb, af);
2894                                 nlmsg_end(skb, nlh);
2895                                 goto out;
2896                         }
2897 skip_entry:
2898                         e++;
2899                 }
2900                 s_e = 0;
2901                 e = 0;
2902                 nla_nest_end(skb, vifs);
2903                 nla_nest_end(skb, af);
2904                 nlmsg_end(skb, nlh);
2905 skip_table:
2906                 t++;
2907         }
2908
2909 out:
2910         cb->args[1] = e;
2911         cb->args[0] = t;
2912
2913         return skb->len;
2914 }
2915
2916 #ifdef CONFIG_PROC_FS
2917 /* The /proc interfaces to multicast routing :
2918  * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2919  */
2920
2921 static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2922         __acquires(mrt_lock)
2923 {
2924         struct mr_vif_iter *iter = seq->private;
2925         struct net *net = seq_file_net(seq);
2926         struct mr_table *mrt;
2927
2928         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2929         if (!mrt)
2930                 return ERR_PTR(-ENOENT);
2931
2932         iter->mrt = mrt;
2933
2934         read_lock(&mrt_lock);
2935         return mr_vif_seq_start(seq, pos);
2936 }
2937
2938 static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2939         __releases(mrt_lock)
2940 {
2941         read_unlock(&mrt_lock);
2942 }
2943
2944 static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2945 {
2946         struct mr_vif_iter *iter = seq->private;
2947         struct mr_table *mrt = iter->mrt;
2948
2949         if (v == SEQ_START_TOKEN) {
2950                 seq_puts(seq,
2951                          "Interface      BytesIn  PktsIn  BytesOut PktsOut Flags Local    Remote\n");
2952         } else {
2953                 const struct vif_device *vif = v;
2954                 const char *name =  vif->dev ?
2955                                     vif->dev->name : "none";
2956
2957                 seq_printf(seq,
2958                            "%2td %-10s %8ld %7ld  %8ld %7ld %05X %08X %08X\n",
2959                            vif - mrt->vif_table,
2960                            name, vif->bytes_in, vif->pkt_in,
2961                            vif->bytes_out, vif->pkt_out,
2962                            vif->flags, vif->local, vif->remote);
2963         }
2964         return 0;
2965 }
2966
2967 static const struct seq_operations ipmr_vif_seq_ops = {
2968         .start = ipmr_vif_seq_start,
2969         .next  = mr_vif_seq_next,
2970         .stop  = ipmr_vif_seq_stop,
2971         .show  = ipmr_vif_seq_show,
2972 };
2973
2974 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2975 {
2976         struct net *net = seq_file_net(seq);
2977         struct mr_table *mrt;
2978
2979         mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2980         if (!mrt)
2981                 return ERR_PTR(-ENOENT);
2982
2983         return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
2984 }
2985
2986 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2987 {
2988         int n;
2989
2990         if (v == SEQ_START_TOKEN) {
2991                 seq_puts(seq,
2992                  "Group    Origin   Iif     Pkts    Bytes    Wrong Oifs\n");
2993         } else {
2994                 const struct mfc_cache *mfc = v;
2995                 const struct mr_mfc_iter *it = seq->private;
2996                 const struct mr_table *mrt = it->mrt;
2997
2998                 seq_printf(seq, "%08X %08X %-3hd",
2999                            (__force u32) mfc->mfc_mcastgrp,
3000                            (__force u32) mfc->mfc_origin,
3001                            mfc->_c.mfc_parent);
3002
3003                 if (it->cache != &mrt->mfc_unres_queue) {
3004                         seq_printf(seq, " %8lu %8lu %8lu",
3005                                    mfc->_c.mfc_un.res.pkt,
3006                                    mfc->_c.mfc_un.res.bytes,
3007                                    mfc->_c.mfc_un.res.wrong_if);
3008                         for (n = mfc->_c.mfc_un.res.minvif;
3009                              n < mfc->_c.mfc_un.res.maxvif; n++) {
3010                                 if (VIF_EXISTS(mrt, n) &&
3011                                     mfc->_c.mfc_un.res.ttls[n] < 255)
3012                                         seq_printf(seq,
3013                                            " %2d:%-3d",
3014                                            n, mfc->_c.mfc_un.res.ttls[n]);
3015                         }
3016                 } else {
3017                         /* unresolved mfc_caches don't contain
3018                          * pkt, bytes and wrong_if values
3019                          */
3020                         seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
3021                 }
3022                 seq_putc(seq, '\n');
3023         }
3024         return 0;
3025 }
3026
3027 static const struct seq_operations ipmr_mfc_seq_ops = {
3028         .start = ipmr_mfc_seq_start,
3029         .next  = mr_mfc_seq_next,
3030         .stop  = mr_mfc_seq_stop,
3031         .show  = ipmr_mfc_seq_show,
3032 };
3033 #endif
3034
3035 #ifdef CONFIG_IP_PIMSM_V2
3036 static const struct net_protocol pim_protocol = {
3037         .handler        =       pim_rcv,
3038         .netns_ok       =       1,
3039 };
3040 #endif
3041
3042 static unsigned int ipmr_seq_read(struct net *net)
3043 {
3044         ASSERT_RTNL();
3045
3046         return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net);
3047 }
3048
3049 static int ipmr_dump(struct net *net, struct notifier_block *nb)
3050 {
3051         return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump,
3052                        ipmr_mr_table_iter, &mrt_lock);
3053 }
3054
3055 static const struct fib_notifier_ops ipmr_notifier_ops_template = {
3056         .family         = RTNL_FAMILY_IPMR,
3057         .fib_seq_read   = ipmr_seq_read,
3058         .fib_dump       = ipmr_dump,
3059         .owner          = THIS_MODULE,
3060 };
3061
3062 static int __net_init ipmr_notifier_init(struct net *net)
3063 {
3064         struct fib_notifier_ops *ops;
3065
3066         net->ipv4.ipmr_seq = 0;
3067
3068         ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net);
3069         if (IS_ERR(ops))
3070                 return PTR_ERR(ops);
3071         net->ipv4.ipmr_notifier_ops = ops;
3072
3073         return 0;
3074 }
3075
3076 static void __net_exit ipmr_notifier_exit(struct net *net)
3077 {
3078         fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops);
3079         net->ipv4.ipmr_notifier_ops = NULL;
3080 }
3081
3082 /* Setup for IP multicast routing */
3083 static int __net_init ipmr_net_init(struct net *net)
3084 {
3085         int err;
3086
3087         err = ipmr_notifier_init(net);
3088         if (err)
3089                 goto ipmr_notifier_fail;
3090
3091         err = ipmr_rules_init(net);
3092         if (err < 0)
3093                 goto ipmr_rules_fail;
3094
3095 #ifdef CONFIG_PROC_FS
3096         err = -ENOMEM;
3097         if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops,
3098                         sizeof(struct mr_vif_iter)))
3099                 goto proc_vif_fail;
3100         if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
3101                         sizeof(struct mr_mfc_iter)))
3102                 goto proc_cache_fail;
3103 #endif
3104         return 0;
3105
3106 #ifdef CONFIG_PROC_FS
3107 proc_cache_fail:
3108         remove_proc_entry("ip_mr_vif", net->proc_net);
3109 proc_vif_fail:
3110         ipmr_rules_exit(net);
3111 #endif
3112 ipmr_rules_fail:
3113         ipmr_notifier_exit(net);
3114 ipmr_notifier_fail:
3115         return err;
3116 }
3117
3118 static void __net_exit ipmr_net_exit(struct net *net)
3119 {
3120 #ifdef CONFIG_PROC_FS
3121         remove_proc_entry("ip_mr_cache", net->proc_net);
3122         remove_proc_entry("ip_mr_vif", net->proc_net);
3123 #endif
3124         ipmr_notifier_exit(net);
3125         ipmr_rules_exit(net);
3126 }
3127
3128 static struct pernet_operations ipmr_net_ops = {
3129         .init = ipmr_net_init,
3130         .exit = ipmr_net_exit,
3131 };
3132
3133 int __init ip_mr_init(void)
3134 {
3135         int err;
3136
3137         mrt_cachep = kmem_cache_create("ip_mrt_cache",
3138                                        sizeof(struct mfc_cache),
3139                                        0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
3140                                        NULL);
3141
3142         err = register_pernet_subsys(&ipmr_net_ops);
3143         if (err)
3144                 goto reg_pernet_fail;
3145
3146         err = register_netdevice_notifier(&ip_mr_notifier);
3147         if (err)
3148                 goto reg_notif_fail;
3149 #ifdef CONFIG_IP_PIMSM_V2
3150         if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
3151                 pr_err("%s: can't add PIM protocol\n", __func__);
3152                 err = -EAGAIN;
3153                 goto add_proto_fail;
3154         }
3155 #endif
3156         rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
3157                       ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
3158         rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
3159                       ipmr_rtm_route, NULL, 0);
3160         rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
3161                       ipmr_rtm_route, NULL, 0);
3162
3163         rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
3164                       NULL, ipmr_rtm_dumplink, 0);
3165         return 0;
3166
3167 #ifdef CONFIG_IP_PIMSM_V2
3168 add_proto_fail:
3169         unregister_netdevice_notifier(&ip_mr_notifier);
3170 #endif
3171 reg_notif_fail:
3172         unregister_pernet_subsys(&ipmr_net_ops);
3173 reg_pernet_fail:
3174         kmem_cache_destroy(mrt_cachep);
3175         return err;
3176 }