net/core/fib_rules.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * net/core/fib_rules.c         Generic Routing Rules
   4  *
   5  * Authors:     Thomas Graf <tgraf@suug.ch>
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/list.h>
  12 #include <linux/module.h>
  13 #include <net/net_namespace.h>
  14 #include <net/sock.h>
  15 #include <net/fib_rules.h>
  16 #include <net/ip_tunnels.h>
  17 #include <linux/indirect_call_wrapper.h>
  18
  19 #if defined(CONFIG_IPV6) && defined(CONFIG_IPV6_MULTIPLE_TABLES)
  20 #ifdef CONFIG_IP_MULTIPLE_TABLES
  21 #define INDIRECT_CALL_MT(f, f2, f1, ...) \
  22         INDIRECT_CALL_INET(f, f2, f1, __VA_ARGS__)
  23 #else
  24 #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f2, __VA_ARGS__)
  25 #endif
  26 #elif defined(CONFIG_IP_MULTIPLE_TABLES)
  27 #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
  28 #else
  29 #define INDIRECT_CALL_MT(f, f2, f1, ...) f(__VA_ARGS__)
  30 #endif
  31
  32 static const struct fib_kuid_range fib_kuid_range_unset = {
  33         KUIDT_INIT(0),
  34         KUIDT_INIT(~0),
  35 };
  36
  37 bool fib_rule_matchall(const struct fib_rule *rule)
  38 {
  39         if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
  40             rule->flags)
  41                 return false;
  42         if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
  43                 return false;
  44         if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
  45             !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
  46                 return false;
  47         if (fib_rule_port_range_set(&rule->sport_range))
  48                 return false;
  49         if (fib_rule_port_range_set(&rule->dport_range))
  50                 return false;
  51         return true;
  52 }
  53 EXPORT_SYMBOL_GPL(fib_rule_matchall);
  54
  55 int fib_default_rule_add(struct fib_rules_ops *ops,
  56                          u32 pref, u32 table)
  57 {
  58         struct fib_rule *r;
  59
  60         r = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
  61         if (r == NULL)
  62                 return -ENOMEM;
  63
  64         refcount_set(&r->refcnt, 1);
  65         r->action = FR_ACT_TO_TBL;
  66         r->pref = pref;
  67         r->table = table;
  68         r->proto = RTPROT_KERNEL;
  69         r->fr_net = ops->fro_net;
  70         r->uid_range = fib_kuid_range_unset;
  71
  72         r->suppress_prefixlen = -1;
  73         r->suppress_ifgroup = -1;
  74
  75         /* The lock is not required here, the list in unreacheable
  76          * at the moment this function is called */
  77         list_add_tail(&r->list, &ops->rules_list);
  78         return 0;
  79 }
  80 EXPORT_SYMBOL(fib_default_rule_add);
  81
  82 static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
  83 {
  84         struct list_head *pos;
  85         struct fib_rule *rule;
  86
  87         if (!list_empty(&ops->rules_list)) {
  88                 pos = ops->rules_list.next;
  89                 if (pos->next != &ops->rules_list) {
  90                         rule = list_entry(pos->next, struct fib_rule, list);
  91                         if (rule->pref)
  92                                 return rule->pref - 1;
  93                 }
  94         }
  95
  96         return 0;
  97 }
  98
  99 static void notify_rule_change(int event, struct fib_rule *rule,
 100                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
 101                                u32 pid);
 102
 103 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
 104 {
 105         struct fib_rules_ops *ops;
 106
 107         rcu_read_lock();
 108         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
 109                 if (ops->family == family) {
 110                         if (!try_module_get(ops->owner))
 111                                 ops = NULL;
 112                         rcu_read_unlock();
 113                         return ops;
 114                 }
 115         }
 116         rcu_read_unlock();
 117
 118         return NULL;
 119 }
 120
 121 static void rules_ops_put(struct fib_rules_ops *ops)
 122 {
 123         if (ops)
 124                 module_put(ops->owner);
 125 }
 126
 127 static void flush_route_cache(struct fib_rules_ops *ops)
 128 {
 129         if (ops->flush_cache)
 130                 ops->flush_cache(ops);
 131 }
 132
 133 static int __fib_rules_register(struct fib_rules_ops *ops)
 134 {
 135         int err = -EEXIST;
 136         struct fib_rules_ops *o;
 137         struct net *net;
 138
 139         net = ops->fro_net;
 140
 141         if (ops->rule_size < sizeof(struct fib_rule))
 142                 return -EINVAL;
 143
 144         if (ops->match == NULL || ops->configure == NULL ||
 145             ops->compare == NULL || ops->fill == NULL ||
 146             ops->action == NULL)
 147                 return -EINVAL;
 148
 149         spin_lock(&net->rules_mod_lock);
 150         list_for_each_entry(o, &net->rules_ops, list)
 151                 if (ops->family == o->family)
 152                         goto errout;
 153
 154         list_add_tail_rcu(&ops->list, &net->rules_ops);
 155         err = 0;
 156 errout:
 157         spin_unlock(&net->rules_mod_lock);
 158
 159         return err;
 160 }
 161
 162 struct fib_rules_ops *
 163 fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
 164 {
 165         struct fib_rules_ops *ops;
 166         int err;
 167
 168         ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
 169         if (ops == NULL)
 170                 return ERR_PTR(-ENOMEM);
 171
 172         INIT_LIST_HEAD(&ops->rules_list);
 173         ops->fro_net = net;
 174
 175         err = __fib_rules_register(ops);
 176         if (err) {
 177                 kfree(ops);
 178                 ops = ERR_PTR(err);
 179         }
 180
 181         return ops;
 182 }
 183 EXPORT_SYMBOL_GPL(fib_rules_register);
 184
 185 static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
 186 {
 187         struct fib_rule *rule, *tmp;
 188
 189         list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
 190                 list_del_rcu(&rule->list);
 191                 if (ops->delete)
 192                         ops->delete(rule);
 193                 fib_rule_put(rule);
 194         }
 195 }
 196
 197 void fib_rules_unregister(struct fib_rules_ops *ops)
 198 {
 199         struct net *net = ops->fro_net;
 200
 201         spin_lock(&net->rules_mod_lock);
 202         list_del_rcu(&ops->list);
 203         spin_unlock(&net->rules_mod_lock);
 204
 205         fib_rules_cleanup_ops(ops);
 206         kfree_rcu(ops, rcu);
 207 }
 208 EXPORT_SYMBOL_GPL(fib_rules_unregister);
 209
 210 static int uid_range_set(struct fib_kuid_range *range)
 211 {
 212         return uid_valid(range->start) && uid_valid(range->end);
 213 }
 214
 215 static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
 216 {
 217         struct fib_rule_uid_range *in;
 218         struct fib_kuid_range out;
 219
 220         in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
 221
 222         out.start = make_kuid(current_user_ns(), in->start);
 223         out.end = make_kuid(current_user_ns(), in->end);
 224
 225         return out;
 226 }
 227
 228 static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
 229 {
 230         struct fib_rule_uid_range out = {
 231                 from_kuid_munged(current_user_ns(), range->start),
 232                 from_kuid_munged(current_user_ns(), range->end)
 233         };
 234
 235         return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
 236 }
 237
 238 static int nla_get_port_range(struct nlattr *pattr,
 239                               struct fib_rule_port_range *port_range)
 240 {
 241         const struct fib_rule_port_range *pr = nla_data(pattr);
 242
 243         if (!fib_rule_port_range_valid(pr))
 244                 return -EINVAL;
 245
 246         port_range->start = pr->start;
 247         port_range->end = pr->end;
 248
 249         return 0;
 250 }
 251
 252 static int nla_put_port_range(struct sk_buff *skb, int attrtype,
 253                               struct fib_rule_port_range *range)
 254 {
 255         return nla_put(skb, attrtype, sizeof(*range), range);
 256 }
 257
 258 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
 259                           struct flowi *fl, int flags,
 260                           struct fib_lookup_arg *arg)
 261 {
 262         int ret = 0;
 263
 264         if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
 265                 goto out;
 266
 267         if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
 268                 goto out;
 269
 270         if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
 271                 goto out;
 272
 273         if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
 274                 goto out;
 275
 276         if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
 277                 goto out;
 278
 279         if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
 280             uid_gt(fl->flowi_uid, rule->uid_range.end))
 281                 goto out;
 282
 283         ret = INDIRECT_CALL_MT(ops->match,
 284                                fib6_rule_match,
 285                                fib4_rule_match,
 286                                rule, fl, flags);
 287 out:
 288         return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
 289 }
 290
 291 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
 292                      int flags, struct fib_lookup_arg *arg)
 293 {
 294         struct fib_rule *rule;
 295         int err;
 296
 297         rcu_read_lock();
 298
 299         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
 300 jumped:
 301                 if (!fib_rule_match(rule, ops, fl, flags, arg))
 302                         continue;
 303
 304                 if (rule->action == FR_ACT_GOTO) {
 305                         struct fib_rule *target;
 306
 307                         target = rcu_dereference(rule->ctarget);
 308                         if (target == NULL) {
 309                                 continue;
 310                         } else {
 311                                 rule = target;
 312                                 goto jumped;
 313                         }
 314                 } else if (rule->action == FR_ACT_NOP)
 315                         continue;
 316                 else
 317                         err = INDIRECT_CALL_MT(ops->action,
 318                                                fib6_rule_action,
 319                                                fib4_rule_action,
 320                                                rule, fl, flags, arg);
 321
 322                 if (!err && ops->suppress && INDIRECT_CALL_MT(ops->suppress,
 323                                                               fib6_rule_suppress,
 324                                                               fib4_rule_suppress,
 325                                                               rule, flags, arg))
 326                         continue;
 327
 328                 if (err != -EAGAIN) {
 329                         if ((arg->flags & FIB_LOOKUP_NOREF) ||
 330                             likely(refcount_inc_not_zero(&rule->refcnt))) {
 331                                 arg->rule = rule;
 332                                 goto out;
 333                         }
 334                         break;
 335                 }
 336         }
 337
 338         err = -ESRCH;
 339 out:
 340         rcu_read_unlock();
 341
 342         return err;
 343 }
 344 EXPORT_SYMBOL_GPL(fib_rules_lookup);
 345
 346 static int call_fib_rule_notifier(struct notifier_block *nb,
 347                                   enum fib_event_type event_type,
 348                                   struct fib_rule *rule, int family,
 349                                   struct netlink_ext_ack *extack)
 350 {
 351         struct fib_rule_notifier_info info = {
 352                 .info.family = family,
 353                 .info.extack = extack,
 354                 .rule = rule,
 355         };
 356
 357         return call_fib_notifier(nb, event_type, &info.info);
 358 }
 359
 360 static int call_fib_rule_notifiers(struct net *net,
 361                                    enum fib_event_type event_type,
 362                                    struct fib_rule *rule,
 363                                    struct fib_rules_ops *ops,
 364                                    struct netlink_ext_ack *extack)
 365 {
 366         struct fib_rule_notifier_info info = {
 367                 .info.family = ops->family,
 368                 .info.extack = extack,
 369                 .rule = rule,
 370         };
 371
 372         ops->fib_rules_seq++;
 373         return call_fib_notifiers(net, event_type, &info.info);
 374 }
 375
 376 /* Called with rcu_read_lock() */
 377 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
 378                    struct netlink_ext_ack *extack)
 379 {
 380         struct fib_rules_ops *ops;
 381         struct fib_rule *rule;
 382         int err = 0;
 383
 384         ops = lookup_rules_ops(net, family);
 385         if (!ops)
 386                 return -EAFNOSUPPORT;
 387         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
 388                 err = call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD,
 389                                              rule, family, extack);
 390                 if (err)
 391                         break;
 392         }
 393         rules_ops_put(ops);
 394
 395         return err;
 396 }
 397 EXPORT_SYMBOL_GPL(fib_rules_dump);
 398
 399 unsigned int fib_rules_seq_read(struct net *net, int family)
 400 {
 401         unsigned int fib_rules_seq;
 402         struct fib_rules_ops *ops;
 403
 404         ASSERT_RTNL();
 405
 406         ops = lookup_rules_ops(net, family);
 407         if (!ops)
 408                 return 0;
 409         fib_rules_seq = ops->fib_rules_seq;
 410         rules_ops_put(ops);
 411
 412         return fib_rules_seq;
 413 }
 414 EXPORT_SYMBOL_GPL(fib_rules_seq_read);
 415
 416 static struct fib_rule *rule_find(struct fib_rules_ops *ops,
 417                                   struct fib_rule_hdr *frh,
 418                                   struct nlattr **tb,
 419                                   struct fib_rule *rule,
 420                                   bool user_priority)
 421 {
 422         struct fib_rule *r;
 423
 424         list_for_each_entry(r, &ops->rules_list, list) {
 425                 if (rule->action && r->action != rule->action)
 426                         continue;
 427
 428                 if (rule->table && r->table != rule->table)
 429                         continue;
 430
 431                 if (user_priority && r->pref != rule->pref)
 432                         continue;
 433
 434                 if (rule->iifname[0] &&
 435                     memcmp(r->iifname, rule->iifname, IFNAMSIZ))
 436                         continue;
 437
 438                 if (rule->oifname[0] &&
 439                     memcmp(r->oifname, rule->oifname, IFNAMSIZ))
 440                         continue;
 441
 442                 if (rule->mark && r->mark != rule->mark)
 443                         continue;
 444
 445                 if (rule->suppress_ifgroup != -1 &&
 446                     r->suppress_ifgroup != rule->suppress_ifgroup)
 447                         continue;
 448
 449                 if (rule->suppress_prefixlen != -1 &&
 450                     r->suppress_prefixlen != rule->suppress_prefixlen)
 451                         continue;
 452
 453                 if (rule->mark_mask && r->mark_mask != rule->mark_mask)
 454                         continue;
 455
 456                 if (rule->tun_id && r->tun_id != rule->tun_id)
 457                         continue;
 458
 459                 if (r->fr_net != rule->fr_net)
 460                         continue;
 461
 462                 if (rule->l3mdev && r->l3mdev != rule->l3mdev)
 463                         continue;
 464
 465                 if (uid_range_set(&rule->uid_range) &&
 466                     (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
 467                     !uid_eq(r->uid_range.end, rule->uid_range.end)))
 468                         continue;
 469
 470                 if (rule->ip_proto && r->ip_proto != rule->ip_proto)
 471                         continue;
 472
 473                 if (rule->proto && r->proto != rule->proto)
 474                         continue;
 475
 476                 if (fib_rule_port_range_set(&rule->sport_range) &&
 477                     !fib_rule_port_range_compare(&r->sport_range,
 478                                                  &rule->sport_range))
 479                         continue;
 480
 481                 if (fib_rule_port_range_set(&rule->dport_range) &&
 482                     !fib_rule_port_range_compare(&r->dport_range,
 483                                                  &rule->dport_range))
 484                         continue;
 485
 486                 if (!ops->compare(r, frh, tb))
 487                         continue;
 488                 return r;
 489         }
 490
 491         return NULL;
 492 }
 493
 494 #ifdef CONFIG_NET_L3_MASTER_DEV
 495 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
 496                               struct netlink_ext_ack *extack)
 497 {
 498         nlrule->l3mdev = nla_get_u8(nla);
 499         if (nlrule->l3mdev != 1) {
 500                 NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
 501                 return -1;
 502         }
 503
 504         return 0;
 505 }
 506 #else
 507 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
 508                               struct netlink_ext_ack *extack)
 509 {
 510         NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
 511         return -1;
 512 }
 513 #endif
 514
 515 static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
 516                        struct netlink_ext_ack *extack,
 517                        struct fib_rules_ops *ops,
 518                        struct nlattr *tb[],
 519                        struct fib_rule **rule,
 520                        bool *user_priority)
 521 {
 522         struct net *net = sock_net(skb->sk);
 523         struct fib_rule_hdr *frh = nlmsg_data(nlh);
 524         struct fib_rule *nlrule = NULL;
 525         int err = -EINVAL;
 526
 527         if (frh->src_len)
 528                 if (!tb[FRA_SRC] ||
 529                     frh->src_len > (ops->addr_size * 8) ||
 530                     nla_len(tb[FRA_SRC]) != ops->addr_size) {
 531                         NL_SET_ERR_MSG(extack, "Invalid source address");
 532                         goto errout;
 533         }
 534
 535         if (frh->dst_len)
 536                 if (!tb[FRA_DST] ||
 537                     frh->dst_len > (ops->addr_size * 8) ||
 538                     nla_len(tb[FRA_DST]) != ops->addr_size) {
 539                         NL_SET_ERR_MSG(extack, "Invalid dst address");
 540                         goto errout;
 541         }
 542
 543         nlrule = kzalloc(ops->rule_size, GFP_KERNEL_ACCOUNT);
 544         if (!nlrule) {
 545                 err = -ENOMEM;
 546                 goto errout;
 547         }
 548         refcount_set(&nlrule->refcnt, 1);
 549         nlrule->fr_net = net;
 550
 551         if (tb[FRA_PRIORITY]) {
 552                 nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]);
 553                 *user_priority = true;
 554         } else {
 555                 nlrule->pref = fib_default_rule_pref(ops);
 556         }
 557
 558         nlrule->proto = tb[FRA_PROTOCOL] ?
 559                 nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC;
 560
 561         if (tb[FRA_IIFNAME]) {
 562                 struct net_device *dev;
 563
 564                 nlrule->iifindex = -1;
 565                 nla_strscpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
 566                 dev = __dev_get_by_name(net, nlrule->iifname);
 567                 if (dev)
 568                         nlrule->iifindex = dev->ifindex;
 569         }
 570
 571         if (tb[FRA_OIFNAME]) {
 572                 struct net_device *dev;
 573
 574                 nlrule->oifindex = -1;
 575                 nla_strscpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
 576                 dev = __dev_get_by_name(net, nlrule->oifname);
 577                 if (dev)
 578                         nlrule->oifindex = dev->ifindex;
 579         }
 580
 581         if (tb[FRA_FWMARK]) {
 582                 nlrule->mark = nla_get_u32(tb[FRA_FWMARK]);
 583                 if (nlrule->mark)
 584                         /* compatibility: if the mark value is non-zero all bits
 585                          * are compared unless a mask is explicitly specified.
 586                          */
 587                         nlrule->mark_mask = 0xFFFFFFFF;
 588         }
 589
 590         if (tb[FRA_FWMASK])
 591                 nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
 592
 593         if (tb[FRA_TUN_ID])
 594                 nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
 595
 596         if (tb[FRA_L3MDEV] &&
 597             fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
 598                 goto errout_free;
 599
 600         nlrule->action = frh->action;
 601         nlrule->flags = frh->flags;
 602         nlrule->table = frh_get_table(frh, tb);
 603         if (tb[FRA_SUPPRESS_PREFIXLEN])
 604                 nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
 605         else
 606                 nlrule->suppress_prefixlen = -1;
 607
 608         if (tb[FRA_SUPPRESS_IFGROUP])
 609                 nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
 610         else
 611                 nlrule->suppress_ifgroup = -1;
 612
 613         if (tb[FRA_GOTO]) {
 614                 if (nlrule->action != FR_ACT_GOTO) {
 615                         NL_SET_ERR_MSG(extack, "Unexpected goto");
 616                         goto errout_free;
 617                 }
 618
 619                 nlrule->target = nla_get_u32(tb[FRA_GOTO]);
 620                 /* Backward jumps are prohibited to avoid endless loops */
 621                 if (nlrule->target <= nlrule->pref) {
 622                         NL_SET_ERR_MSG(extack, "Backward goto not supported");
 623                         goto errout_free;
 624                 }
 625         } else if (nlrule->action == FR_ACT_GOTO) {
 626                 NL_SET_ERR_MSG(extack, "Missing goto target for action goto");
 627                 goto errout_free;
 628         }
 629
 630         if (nlrule->l3mdev && nlrule->table) {
 631                 NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive");
 632                 goto errout_free;
 633         }
 634
 635         if (tb[FRA_UID_RANGE]) {
 636                 if (current_user_ns() != net->user_ns) {
 637                         err = -EPERM;
 638                         NL_SET_ERR_MSG(extack, "No permission to set uid");
 639                         goto errout_free;
 640                 }
 641
 642                 nlrule->uid_range = nla_get_kuid_range(tb);
 643
 644                 if (!uid_range_set(&nlrule->uid_range) ||
 645                     !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) {
 646                         NL_SET_ERR_MSG(extack, "Invalid uid range");
 647                         goto errout_free;
 648                 }
 649         } else {
 650                 nlrule->uid_range = fib_kuid_range_unset;
 651         }
 652
 653         if (tb[FRA_IP_PROTO])
 654                 nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);
 655
 656         if (tb[FRA_SPORT_RANGE]) {
 657                 err = nla_get_port_range(tb[FRA_SPORT_RANGE],
 658                                          &nlrule->sport_range);
 659                 if (err) {
 660                         NL_SET_ERR_MSG(extack, "Invalid sport range");
 661                         goto errout_free;
 662                 }
 663         }
 664
 665         if (tb[FRA_DPORT_RANGE]) {
 666                 err = nla_get_port_range(tb[FRA_DPORT_RANGE],
 667                                          &nlrule->dport_range);
 668                 if (err) {
 669                         NL_SET_ERR_MSG(extack, "Invalid dport range");
 670                         goto errout_free;
 671                 }
 672         }
 673
 674         *rule = nlrule;
 675
 676         return 0;
 677
 678 errout_free:
 679         kfree(nlrule);
 680 errout:
 681         return err;
 682 }
 683
 684 static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
 685                        struct nlattr **tb, struct fib_rule *rule)
 686 {
 687         struct fib_rule *r;
 688
 689         list_for_each_entry(r, &ops->rules_list, list) {
 690                 if (r->action != rule->action)
 691                         continue;
 692
 693                 if (r->table != rule->table)
 694                         continue;
 695
 696                 if (r->pref != rule->pref)
 697                         continue;
 698
 699                 if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
 700                         continue;
 701
 702                 if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
 703                         continue;
 704
 705                 if (r->mark != rule->mark)
 706                         continue;
 707
 708                 if (r->suppress_ifgroup != rule->suppress_ifgroup)
 709                         continue;
 710
 711                 if (r->suppress_prefixlen != rule->suppress_prefixlen)
 712                         continue;
 713
 714                 if (r->mark_mask != rule->mark_mask)
 715                         continue;
 716
 717                 if (r->tun_id != rule->tun_id)
 718                         continue;
 719
 720                 if (r->fr_net != rule->fr_net)
 721                         continue;
 722
 723                 if (r->l3mdev != rule->l3mdev)
 724                         continue;
 725
 726                 if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
 727                     !uid_eq(r->uid_range.end, rule->uid_range.end))
 728                         continue;
 729
 730                 if (r->ip_proto != rule->ip_proto)
 731                         continue;
 732
 733                 if (r->proto != rule->proto)
 734                         continue;
 735
 736                 if (!fib_rule_port_range_compare(&r->sport_range,
 737                                                  &rule->sport_range))
 738                         continue;
 739
 740                 if (!fib_rule_port_range_compare(&r->dport_range,
 741                                                  &rule->dport_range))
 742                         continue;
 743
 744                 if (!ops->compare(r, frh, tb))
 745                         continue;
 746                 return 1;
 747         }
 748         return 0;
 749 }
 750
 751 static const struct nla_policy fib_rule_policy[FRA_MAX + 1] = {
 752         [FRA_UNSPEC]    = { .strict_start_type = FRA_DPORT_RANGE + 1 },
 753         [FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
 754         [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
 755         [FRA_PRIORITY]  = { .type = NLA_U32 },
 756         [FRA_FWMARK]    = { .type = NLA_U32 },
 757         [FRA_FLOW]      = { .type = NLA_U32 },
 758         [FRA_TUN_ID]    = { .type = NLA_U64 },
 759         [FRA_FWMASK]    = { .type = NLA_U32 },
 760         [FRA_TABLE]     = { .type = NLA_U32 },
 761         [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 },
 762         [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 },
 763         [FRA_GOTO]      = { .type = NLA_U32 },
 764         [FRA_L3MDEV]    = { .type = NLA_U8 },
 765         [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) },
 766         [FRA_PROTOCOL]  = { .type = NLA_U8 },
 767         [FRA_IP_PROTO]  = { .type = NLA_U8 },
 768         [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) },
 769         [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
 770 };
 771
 772 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
 773                    struct netlink_ext_ack *extack)
 774 {
 775         struct net *net = sock_net(skb->sk);
 776         struct fib_rule_hdr *frh = nlmsg_data(nlh);
 777         struct fib_rules_ops *ops = NULL;
 778         struct fib_rule *rule = NULL, *r, *last = NULL;
 779         struct nlattr *tb[FRA_MAX + 1];
 780         int err = -EINVAL, unresolved = 0;
 781         bool user_priority = false;
 782
 783         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
 784                 NL_SET_ERR_MSG(extack, "Invalid msg length");
 785                 goto errout;
 786         }
 787
 788         ops = lookup_rules_ops(net, frh->family);
 789         if (!ops) {
 790                 err = -EAFNOSUPPORT;
 791                 NL_SET_ERR_MSG(extack, "Rule family not supported");
 792                 goto errout;
 793         }
 794
 795         err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
 796                                      fib_rule_policy, extack);
 797         if (err < 0) {
 798                 NL_SET_ERR_MSG(extack, "Error parsing msg");
 799                 goto errout;
 800         }
 801
 802         err = fib_nl2rule(skb, nlh, extack, ops, tb, &rule, &user_priority);
 803         if (err)
 804                 goto errout;
 805
 806         if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
 807             rule_exists(ops, frh, tb, rule)) {
 808                 err = -EEXIST;
 809                 goto errout_free;
 810         }
 811
 812         err = ops->configure(rule, skb, frh, tb, extack);
 813         if (err < 0)
 814                 goto errout_free;
 815
 816         err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops,
 817                                       extack);
 818         if (err < 0)
 819                 goto errout_free;
 820
 821         list_for_each_entry(r, &ops->rules_list, list) {
 822                 if (r->pref == rule->target) {
 823                         RCU_INIT_POINTER(rule->ctarget, r);
 824                         break;
 825                 }
 826         }
 827
 828         if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
 829                 unresolved = 1;
 830
 831         list_for_each_entry(r, &ops->rules_list, list) {
 832                 if (r->pref > rule->pref)
 833                         break;
 834                 last = r;
 835         }
 836
 837         if (last)
 838                 list_add_rcu(&rule->list, &last->list);
 839         else
 840                 list_add_rcu(&rule->list, &ops->rules_list);
 841
 842         if (ops->unresolved_rules) {
 843                 /*
 844                  * There are unresolved goto rules in the list, check if
 845                  * any of them are pointing to this new rule.
 846                  */
 847                 list_for_each_entry(r, &ops->rules_list, list) {
 848                         if (r->action == FR_ACT_GOTO &&
 849                             r->target == rule->pref &&
 850                             rtnl_dereference(r->ctarget) == NULL) {
 851                                 rcu_assign_pointer(r->ctarget, rule);
 852                                 if (--ops->unresolved_rules == 0)
 853                                         break;
 854                         }
 855                 }
 856         }
 857
 858         if (rule->action == FR_ACT_GOTO)
 859                 ops->nr_goto_rules++;
 860
 861         if (unresolved)
 862                 ops->unresolved_rules++;
 863
 864         if (rule->tun_id)
 865                 ip_tunnel_need_metadata();
 866
 867         notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
 868         flush_route_cache(ops);
 869         rules_ops_put(ops);
 870         return 0;
 871
 872 errout_free:
 873         kfree(rule);
 874 errout:
 875         rules_ops_put(ops);
 876         return err;
 877 }
 878 EXPORT_SYMBOL_GPL(fib_nl_newrule);
 879
 880 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
 881                    struct netlink_ext_ack *extack)
 882 {
 883         struct net *net = sock_net(skb->sk);
 884         struct fib_rule_hdr *frh = nlmsg_data(nlh);
 885         struct fib_rules_ops *ops = NULL;
 886         struct fib_rule *rule = NULL, *r, *nlrule = NULL;
 887         struct nlattr *tb[FRA_MAX+1];
 888         int err = -EINVAL;
 889         bool user_priority = false;
 890
 891         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
 892                 NL_SET_ERR_MSG(extack, "Invalid msg length");
 893                 goto errout;
 894         }
 895
 896         ops = lookup_rules_ops(net, frh->family);
 897         if (ops == NULL) {
 898                 err = -EAFNOSUPPORT;
 899                 NL_SET_ERR_MSG(extack, "Rule family not supported");
 900                 goto errout;
 901         }
 902
 903         err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
 904                                      fib_rule_policy, extack);
 905         if (err < 0) {
 906                 NL_SET_ERR_MSG(extack, "Error parsing msg");
 907                 goto errout;
 908         }
 909
 910         err = fib_nl2rule(skb, nlh, extack, ops, tb, &nlrule, &user_priority);
 911         if (err)
 912                 goto errout;
 913
 914         rule = rule_find(ops, frh, tb, nlrule, user_priority);
 915         if (!rule) {
 916                 err = -ENOENT;
 917                 goto errout;
 918         }
 919
 920         if (rule->flags & FIB_RULE_PERMANENT) {
 921                 err = -EPERM;
 922                 goto errout;
 923         }
 924
 925         if (ops->delete) {
 926                 err = ops->delete(rule);
 927                 if (err)
 928                         goto errout;
 929         }
 930
 931         if (rule->tun_id)
 932                 ip_tunnel_unneed_metadata();
 933
 934         list_del_rcu(&rule->list);
 935
 936         if (rule->action == FR_ACT_GOTO) {
 937                 ops->nr_goto_rules--;
 938                 if (rtnl_dereference(rule->ctarget) == NULL)
 939                         ops->unresolved_rules--;
 940         }
 941
 942         /*
 943          * Check if this rule is a target to any of them. If so,
 944          * adjust to the next one with the same preference or
 945          * disable them. As this operation is eventually very
 946          * expensive, it is only performed if goto rules, except
 947          * current if it is goto rule, have actually been added.
 948          */
 949         if (ops->nr_goto_rules > 0) {
 950                 struct fib_rule *n;
 951
 952                 n = list_next_entry(rule, list);
 953                 if (&n->list == &ops->rules_list || n->pref != rule->pref)
 954                         n = NULL;
 955                 list_for_each_entry(r, &ops->rules_list, list) {
 956                         if (rtnl_dereference(r->ctarget) != rule)
 957                                 continue;
 958                         rcu_assign_pointer(r->ctarget, n);
 959                         if (!n)
 960                                 ops->unresolved_rules++;
 961                 }
 962         }
 963
 964         call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops,
 965                                 NULL);
 966         notify_rule_change(RTM_DELRULE, rule, ops, nlh,
 967                            NETLINK_CB(skb).portid);
 968         fib_rule_put(rule);
 969         flush_route_cache(ops);
 970         rules_ops_put(ops);
 971         kfree(nlrule);
 972         return 0;
 973
 974 errout:
 975         kfree(nlrule);
 976         rules_ops_put(ops);
 977         return err;
 978 }
 979 EXPORT_SYMBOL_GPL(fib_nl_delrule);
 980
 981 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
 982                                          struct fib_rule *rule)
 983 {
 984         size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
 985                          + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
 986                          + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
 987                          + nla_total_size(4) /* FRA_PRIORITY */
 988                          + nla_total_size(4) /* FRA_TABLE */
 989                          + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
 990                          + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
 991                          + nla_total_size(4) /* FRA_FWMARK */
 992                          + nla_total_size(4) /* FRA_FWMASK */
 993                          + nla_total_size_64bit(8) /* FRA_TUN_ID */
 994                          + nla_total_size(sizeof(struct fib_kuid_range))
 995                          + nla_total_size(1) /* FRA_PROTOCOL */
 996                          + nla_total_size(1) /* FRA_IP_PROTO */
 997                          + nla_total_size(sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */
 998                          + nla_total_size(sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */
 999
1000         if (ops->nlmsg_payload)
1001                 payload += ops->nlmsg_payload(rule);
1002
1003         return payload;
1004 }
1005
1006 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
1007                             u32 pid, u32 seq, int type, int flags,
1008                             struct fib_rules_ops *ops)
1009 {
1010         struct nlmsghdr *nlh;
1011         struct fib_rule_hdr *frh;
1012
1013         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
1014         if (nlh == NULL)
1015                 return -EMSGSIZE;
1016
1017         frh = nlmsg_data(nlh);
1018         frh->family = ops->family;
1019         frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT;
1020         if (nla_put_u32(skb, FRA_TABLE, rule->table))
1021                 goto nla_put_failure;
1022         if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
1023                 goto nla_put_failure;
1024         frh->res1 = 0;
1025         frh->res2 = 0;
1026         frh->action = rule->action;
1027         frh->flags = rule->flags;
1028
1029         if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
1030                 goto nla_put_failure;
1031
1032         if (rule->action == FR_ACT_GOTO &&
1033             rcu_access_pointer(rule->ctarget) == NULL)
1034                 frh->flags |= FIB_RULE_UNRESOLVED;
1035
1036         if (rule->iifname[0]) {
1037                 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
1038                         goto nla_put_failure;
1039                 if (rule->iifindex == -1)
1040                         frh->flags |= FIB_RULE_IIF_DETACHED;
1041         }
1042
1043         if (rule->oifname[0]) {
1044                 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
1045                         goto nla_put_failure;
1046                 if (rule->oifindex == -1)
1047                         frh->flags |= FIB_RULE_OIF_DETACHED;
1048         }
1049
1050         if ((rule->pref &&
1051              nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
1052             (rule->mark &&
1053              nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
1054             ((rule->mark_mask || rule->mark) &&
1055              nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
1056             (rule->target &&
1057              nla_put_u32(skb, FRA_GOTO, rule->target)) ||
1058             (rule->tun_id &&
1059              nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
1060             (rule->l3mdev &&
1061              nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
1062             (uid_range_set(&rule->uid_range) &&
1063              nla_put_uid_range(skb, &rule->uid_range)) ||
1064             (fib_rule_port_range_set(&rule->sport_range) &&
1065              nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
1066             (fib_rule_port_range_set(&rule->dport_range) &&
1067              nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) ||
1068             (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto)))
1069                 goto nla_put_failure;
1070
1071         if (rule->suppress_ifgroup != -1) {
1072                 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
1073                         goto nla_put_failure;
1074         }
1075
1076         if (ops->fill(rule, skb, frh) < 0)
1077                 goto nla_put_failure;
1078
1079         nlmsg_end(skb, nlh);
1080         return 0;
1081
1082 nla_put_failure:
1083         nlmsg_cancel(skb, nlh);
1084         return -EMSGSIZE;
1085 }
1086
1087 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
1088                       struct fib_rules_ops *ops)
1089 {
1090         int idx = 0;
1091         struct fib_rule *rule;
1092         int err = 0;
1093
1094         rcu_read_lock();
1095         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
1096                 if (idx < cb->args[1])
1097                         goto skip;
1098
1099                 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
1100                                        cb->nlh->nlmsg_seq, RTM_NEWRULE,
1101                                        NLM_F_MULTI, ops);
1102                 if (err)
1103                         break;
1104 skip:
1105                 idx++;
1106         }
1107         rcu_read_unlock();
1108         cb->args[1] = idx;
1109         rules_ops_put(ops);
1110
1111         return err;
1112 }
1113
1114 static int fib_valid_dumprule_req(const struct nlmsghdr *nlh,
1115                                    struct netlink_ext_ack *extack)
1116 {
1117         struct fib_rule_hdr *frh;
1118
1119         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
1120                 NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request");
1121                 return -EINVAL;
1122         }
1123
1124         frh = nlmsg_data(nlh);
1125         if (frh->dst_len || frh->src_len || frh->tos || frh->table ||
1126             frh->res1 || frh->res2 || frh->action || frh->flags) {
1127                 NL_SET_ERR_MSG(extack,
1128                                "Invalid values in header for fib rule dump request");
1129                 return -EINVAL;
1130         }
1131
1132         if (nlmsg_attrlen(nlh, sizeof(*frh))) {
1133                 NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request");
1134                 return -EINVAL;
1135         }
1136
1137         return 0;
1138 }
1139
1140 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
1141 {
1142         const struct nlmsghdr *nlh = cb->nlh;
1143         struct net *net = sock_net(skb->sk);
1144         struct fib_rules_ops *ops;
1145         int idx = 0, family;
1146
1147         if (cb->strict_check) {
1148                 int err = fib_valid_dumprule_req(nlh, cb->extack);
1149
1150                 if (err < 0)
1151                         return err;
1152         }
1153
1154         family = rtnl_msg_family(nlh);
1155         if (family != AF_UNSPEC) {
1156                 /* Protocol specific dump request */
1157                 ops = lookup_rules_ops(net, family);
1158                 if (ops == NULL)
1159                         return -EAFNOSUPPORT;
1160
1161                 dump_rules(skb, cb, ops);
1162
1163                 return skb->len;
1164         }
1165
1166         rcu_read_lock();
1167         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
1168                 if (idx < cb->args[0] || !try_module_get(ops->owner))
1169                         goto skip;
1170
1171                 if (dump_rules(skb, cb, ops) < 0)
1172                         break;
1173
1174                 cb->args[1] = 0;
1175 skip:
1176                 idx++;
1177         }
1178         rcu_read_unlock();
1179         cb->args[0] = idx;
1180
1181         return skb->len;
1182 }
1183
1184 static void notify_rule_change(int event, struct fib_rule *rule,
1185                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
1186                                u32 pid)
1187 {
1188         struct net *net;
1189         struct sk_buff *skb;
1190         int err = -ENOMEM;
1191
1192         net = ops->fro_net;
1193         skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
1194         if (skb == NULL)
1195                 goto errout;
1196
1197         err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
1198         if (err < 0) {
1199                 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
1200                 WARN_ON(err == -EMSGSIZE);
1201                 kfree_skb(skb);
1202                 goto errout;
1203         }
1204
1205         rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
1206         return;
1207 errout:
1208         if (err < 0)
1209                 rtnl_set_sk_err(net, ops->nlgroup, err);
1210 }
1211
1212 static void attach_rules(struct list_head *rules, struct net_device *dev)
1213 {
1214         struct fib_rule *rule;
1215
1216         list_for_each_entry(rule, rules, list) {
1217                 if (rule->iifindex == -1 &&
1218                     strcmp(dev->name, rule->iifname) == 0)
1219                         rule->iifindex = dev->ifindex;
1220                 if (rule->oifindex == -1 &&
1221                     strcmp(dev->name, rule->oifname) == 0)
1222                         rule->oifindex = dev->ifindex;
1223         }
1224 }
1225
1226 static void detach_rules(struct list_head *rules, struct net_device *dev)
1227 {
1228         struct fib_rule *rule;
1229
1230         list_for_each_entry(rule, rules, list) {
1231                 if (rule->iifindex == dev->ifindex)
1232                         rule->iifindex = -1;
1233                 if (rule->oifindex == dev->ifindex)
1234                         rule->oifindex = -1;
1235         }
1236 }
1237
1238
1239 static int fib_rules_event(struct notifier_block *this, unsigned long event,
1240                            void *ptr)
1241 {
1242         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1243         struct net *net = dev_net(dev);
1244         struct fib_rules_ops *ops;
1245
1246         ASSERT_RTNL();
1247
1248         switch (event) {
1249         case NETDEV_REGISTER:
1250                 list_for_each_entry(ops, &net->rules_ops, list)
1251                         attach_rules(&ops->rules_list, dev);
1252                 break;
1253
1254         case NETDEV_CHANGENAME:
1255                 list_for_each_entry(ops, &net->rules_ops, list) {
1256                         detach_rules(&ops->rules_list, dev);
1257                         attach_rules(&ops->rules_list, dev);
1258                 }
1259                 break;
1260
1261         case NETDEV_UNREGISTER:
1262                 list_for_each_entry(ops, &net->rules_ops, list)
1263                         detach_rules(&ops->rules_list, dev);
1264                 break;
1265         }
1266
1267         return NOTIFY_DONE;
1268 }
1269
1270 static struct notifier_block fib_rules_notifier = {
1271         .notifier_call = fib_rules_event,
1272 };
1273
1274 static int __net_init fib_rules_net_init(struct net *net)
1275 {
1276         INIT_LIST_HEAD(&net->rules_ops);
1277         spin_lock_init(&net->rules_mod_lock);
1278         return 0;
1279 }
1280
1281 static void __net_exit fib_rules_net_exit(struct net *net)
1282 {
1283         WARN_ON_ONCE(!list_empty(&net->rules_ops));
1284 }
1285
1286 static struct pernet_operations fib_rules_net_ops = {
1287         .init = fib_rules_net_init,
1288         .exit = fib_rules_net_exit,
1289 };
1290
1291 static int __init fib_rules_init(void)
1292 {
1293         int err;
1294         rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
1295         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
1296         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
1297
1298         err = register_pernet_subsys(&fib_rules_net_ops);
1299         if (err < 0)
1300                 goto fail;
1301
1302         err = register_netdevice_notifier(&fib_rules_notifier);
1303         if (err < 0)
1304                 goto fail_unregister;
1305
1306         return 0;
1307
1308 fail_unregister:
1309         unregister_pernet_subsys(&fib_rules_net_ops);
1310 fail:
1311         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
1312         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
1313         rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
1314         return err;
1315 }
1316
1317 subsys_initcall(fib_rules_init);