net/ipv4/ipmr.c

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