net/core/fib_rules.c

   1 /*
   2  * net/core/fib_rules.c         Generic Routing Rules
   3  *
   4  *      This program is free software; you can redistribute it and/or
   5  *      modify it under the terms of the GNU General Public License as
   6  *      published by the Free Software Foundation, version 2.
   7  *
   8  * Authors:     Thomas Graf <tgraf@suug.ch>
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/list.h>
  15 #include <net/net_namespace.h>
  16 #include <net/sock.h>
  17 #include <net/fib_rules.h>
  18
  19 int fib_default_rule_add(struct fib_rules_ops *ops,
  20                          u32 pref, u32 table, u32 flags)
  21 {
  22         struct fib_rule *r;
  23
  24         r = kzalloc(ops->rule_size, GFP_KERNEL);
  25         if (r == NULL)
  26                 return -ENOMEM;
  27
  28         atomic_set(&r->refcnt, 1);
  29         r->action = FR_ACT_TO_TBL;
  30         r->pref = pref;
  31         r->table = table;
  32         r->flags = flags;
  33         r->fr_net = hold_net(ops->fro_net);
  34
  35         /* The lock is not required here, the list in unreacheable
  36          * at the moment this function is called */
  37         list_add_tail(&r->list, &ops->rules_list);
  38         return 0;
  39 }
  40 EXPORT_SYMBOL(fib_default_rule_add);
  41
  42 static void notify_rule_change(int event, struct fib_rule *rule,
  43                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
  44                                u32 pid);
  45
  46 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
  47 {
  48         struct fib_rules_ops *ops;
  49
  50         rcu_read_lock();
  51         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
  52                 if (ops->family == family) {
  53                         if (!try_module_get(ops->owner))
  54                                 ops = NULL;
  55                         rcu_read_unlock();
  56                         return ops;
  57                 }
  58         }
  59         rcu_read_unlock();
  60
  61         return NULL;
  62 }
  63
  64 static void rules_ops_put(struct fib_rules_ops *ops)
  65 {
  66         if (ops)
  67                 module_put(ops->owner);
  68 }
  69
  70 static void flush_route_cache(struct fib_rules_ops *ops)
  71 {
  72         if (ops->flush_cache)
  73                 ops->flush_cache(ops);
  74 }
  75
  76 static int __fib_rules_register(struct fib_rules_ops *ops)
  77 {
  78         int err = -EEXIST;
  79         struct fib_rules_ops *o;
  80         struct net *net;
  81
  82         net = ops->fro_net;
  83
  84         if (ops->rule_size < sizeof(struct fib_rule))
  85                 return -EINVAL;
  86
  87         if (ops->match == NULL || ops->configure == NULL ||
  88             ops->compare == NULL || ops->fill == NULL ||
  89             ops->action == NULL)
  90                 return -EINVAL;
  91
  92         spin_lock(&net->rules_mod_lock);
  93         list_for_each_entry(o, &net->rules_ops, list)
  94                 if (ops->family == o->family)
  95                         goto errout;
  96
  97         hold_net(net);
  98         list_add_tail_rcu(&ops->list, &net->rules_ops);
  99         err = 0;
 100 errout:
 101         spin_unlock(&net->rules_mod_lock);
 102
 103         return err;
 104 }
 105
 106 struct fib_rules_ops *
 107 fib_rules_register(struct fib_rules_ops *tmpl, struct net *net)
 108 {
 109         struct fib_rules_ops *ops;
 110         int err;
 111
 112         ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
 113         if (ops == NULL)
 114                 return ERR_PTR(-ENOMEM);
 115
 116         INIT_LIST_HEAD(&ops->rules_list);
 117         ops->fro_net = net;
 118
 119         err = __fib_rules_register(ops);
 120         if (err) {
 121                 kfree(ops);
 122                 ops = ERR_PTR(err);
 123         }
 124
 125         return ops;
 126 }
 127 EXPORT_SYMBOL_GPL(fib_rules_register);
 128
 129 void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
 130 {
 131         struct fib_rule *rule, *tmp;
 132
 133         list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
 134                 list_del_rcu(&rule->list);
 135                 fib_rule_put(rule);
 136         }
 137 }
 138 EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);
 139
 140 static void fib_rules_put_rcu(struct rcu_head *head)
 141 {
 142         struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
 143         struct net *net = ops->fro_net;
 144
 145         release_net(net);
 146         kfree(ops);
 147 }
 148
 149 void fib_rules_unregister(struct fib_rules_ops *ops)
 150 {
 151         struct net *net = ops->fro_net;
 152
 153         spin_lock(&net->rules_mod_lock);
 154         list_del_rcu(&ops->list);
 155         fib_rules_cleanup_ops(ops);
 156         spin_unlock(&net->rules_mod_lock);
 157
 158         call_rcu(&ops->rcu, fib_rules_put_rcu);
 159 }
 160 EXPORT_SYMBOL_GPL(fib_rules_unregister);
 161
 162 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
 163                           struct flowi *fl, int flags)
 164 {
 165         int ret = 0;
 166
 167         if (rule->iifindex && (rule->iifindex != fl->iif))
 168                 goto out;
 169
 170         if (rule->oifindex && (rule->oifindex != fl->oif))
 171                 goto out;
 172
 173         if ((rule->mark ^ fl->mark) & rule->mark_mask)
 174                 goto out;
 175
 176         ret = ops->match(rule, fl, flags);
 177 out:
 178         return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
 179 }
 180
 181 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
 182                      int flags, struct fib_lookup_arg *arg)
 183 {
 184         struct fib_rule *rule;
 185         int err;
 186
 187         rcu_read_lock();
 188
 189         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
 190 jumped:
 191                 if (!fib_rule_match(rule, ops, fl, flags))
 192                         continue;
 193
 194                 if (rule->action == FR_ACT_GOTO) {
 195                         struct fib_rule *target;
 196
 197                         target = rcu_dereference(rule->ctarget);
 198                         if (target == NULL) {
 199                                 continue;
 200                         } else {
 201                                 rule = target;
 202                                 goto jumped;
 203                         }
 204                 } else if (rule->action == FR_ACT_NOP)
 205                         continue;
 206                 else
 207                         err = ops->action(rule, fl, flags, arg);
 208
 209                 if (err != -EAGAIN) {
 210                         fib_rule_get(rule);
 211                         arg->rule = rule;
 212                         goto out;
 213                 }
 214         }
 215
 216         err = -ESRCH;
 217 out:
 218         rcu_read_unlock();
 219
 220         return err;
 221 }
 222 EXPORT_SYMBOL_GPL(fib_rules_lookup);
 223
 224 static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
 225                             struct fib_rules_ops *ops)
 226 {
 227         int err = -EINVAL;
 228
 229         if (frh->src_len)
 230                 if (tb[FRA_SRC] == NULL ||
 231                     frh->src_len > (ops->addr_size * 8) ||
 232                     nla_len(tb[FRA_SRC]) != ops->addr_size)
 233                         goto errout;
 234
 235         if (frh->dst_len)
 236                 if (tb[FRA_DST] == NULL ||
 237                     frh->dst_len > (ops->addr_size * 8) ||
 238                     nla_len(tb[FRA_DST]) != ops->addr_size)
 239                         goto errout;
 240
 241         err = 0;
 242 errout:
 243         return err;
 244 }
 245
 246 static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 247 {
 248         struct net *net = sock_net(skb->sk);
 249         struct fib_rule_hdr *frh = nlmsg_data(nlh);
 250         struct fib_rules_ops *ops = NULL;
 251         struct fib_rule *rule, *r, *last = NULL;
 252         struct nlattr *tb[FRA_MAX+1];
 253         int err = -EINVAL, unresolved = 0;
 254
 255         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
 256                 goto errout;
 257
 258         ops = lookup_rules_ops(net, frh->family);
 259         if (ops == NULL) {
 260                 err = -EAFNOSUPPORT;
 261                 goto errout;
 262         }
 263
 264         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
 265         if (err < 0)
 266                 goto errout;
 267
 268         err = validate_rulemsg(frh, tb, ops);
 269         if (err < 0)
 270                 goto errout;
 271
 272         rule = kzalloc(ops->rule_size, GFP_KERNEL);
 273         if (rule == NULL) {
 274                 err = -ENOMEM;
 275                 goto errout;
 276         }
 277         rule->fr_net = hold_net(net);
 278
 279         if (tb[FRA_PRIORITY])
 280                 rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
 281
 282         if (tb[FRA_IIFNAME]) {
 283                 struct net_device *dev;
 284
 285                 rule->iifindex = -1;
 286                 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
 287                 dev = __dev_get_by_name(net, rule->iifname);
 288                 if (dev)
 289                         rule->iifindex = dev->ifindex;
 290         }
 291
 292         if (tb[FRA_OIFNAME]) {
 293                 struct net_device *dev;
 294
 295                 rule->oifindex = -1;
 296                 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
 297                 dev = __dev_get_by_name(net, rule->oifname);
 298                 if (dev)
 299                         rule->oifindex = dev->ifindex;
 300         }
 301
 302         if (tb[FRA_FWMARK]) {
 303                 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
 304                 if (rule->mark)
 305                         /* compatibility: if the mark value is non-zero all bits
 306                          * are compared unless a mask is explicitly specified.
 307                          */
 308                         rule->mark_mask = 0xFFFFFFFF;
 309         }
 310
 311         if (tb[FRA_FWMASK])
 312                 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
 313
 314         rule->action = frh->action;
 315         rule->flags = frh->flags;
 316         rule->table = frh_get_table(frh, tb);
 317
 318         if (!tb[FRA_PRIORITY] && ops->default_pref)
 319                 rule->pref = ops->default_pref(ops);
 320
 321         err = -EINVAL;
 322         if (tb[FRA_GOTO]) {
 323                 if (rule->action != FR_ACT_GOTO)
 324                         goto errout_free;
 325
 326                 rule->target = nla_get_u32(tb[FRA_GOTO]);
 327                 /* Backward jumps are prohibited to avoid endless loops */
 328                 if (rule->target <= rule->pref)
 329                         goto errout_free;
 330
 331                 list_for_each_entry(r, &ops->rules_list, list) {
 332                         if (r->pref == rule->target) {
 333                                 rule->ctarget = r;
 334                                 break;
 335                         }
 336                 }
 337
 338                 if (rule->ctarget == NULL)
 339                         unresolved = 1;
 340         } else if (rule->action == FR_ACT_GOTO)
 341                 goto errout_free;
 342
 343         err = ops->configure(rule, skb, frh, tb);
 344         if (err < 0)
 345                 goto errout_free;
 346
 347         list_for_each_entry(r, &ops->rules_list, list) {
 348                 if (r->pref > rule->pref)
 349                         break;
 350                 last = r;
 351         }
 352
 353         fib_rule_get(rule);
 354
 355         if (ops->unresolved_rules) {
 356                 /*
 357                  * There are unresolved goto rules in the list, check if
 358                  * any of them are pointing to this new rule.
 359                  */
 360                 list_for_each_entry(r, &ops->rules_list, list) {
 361                         if (r->action == FR_ACT_GOTO &&
 362                             r->target == rule->pref) {
 363                                 BUG_ON(r->ctarget != NULL);
 364                                 rcu_assign_pointer(r->ctarget, rule);
 365                                 if (--ops->unresolved_rules == 0)
 366                                         break;
 367                         }
 368                 }
 369         }
 370
 371         if (rule->action == FR_ACT_GOTO)
 372                 ops->nr_goto_rules++;
 373
 374         if (unresolved)
 375                 ops->unresolved_rules++;
 376
 377         if (last)
 378                 list_add_rcu(&rule->list, &last->list);
 379         else
 380                 list_add_rcu(&rule->list, &ops->rules_list);
 381
 382         notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
 383         flush_route_cache(ops);
 384         rules_ops_put(ops);
 385         return 0;
 386
 387 errout_free:
 388         release_net(rule->fr_net);
 389         kfree(rule);
 390 errout:
 391         rules_ops_put(ops);
 392         return err;
 393 }
 394
 395 static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 396 {
 397         struct net *net = sock_net(skb->sk);
 398         struct fib_rule_hdr *frh = nlmsg_data(nlh);
 399         struct fib_rules_ops *ops = NULL;
 400         struct fib_rule *rule, *tmp;
 401         struct nlattr *tb[FRA_MAX+1];
 402         int err = -EINVAL;
 403
 404         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
 405                 goto errout;
 406
 407         ops = lookup_rules_ops(net, frh->family);
 408         if (ops == NULL) {
 409                 err = -EAFNOSUPPORT;
 410                 goto errout;
 411         }
 412
 413         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
 414         if (err < 0)
 415                 goto errout;
 416
 417         err = validate_rulemsg(frh, tb, ops);
 418         if (err < 0)
 419                 goto errout;
 420
 421         list_for_each_entry(rule, &ops->rules_list, list) {
 422                 if (frh->action && (frh->action != rule->action))
 423                         continue;
 424
 425                 if (frh->table && (frh_get_table(frh, tb) != rule->table))
 426                         continue;
 427
 428                 if (tb[FRA_PRIORITY] &&
 429                     (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
 430                         continue;
 431
 432                 if (tb[FRA_IIFNAME] &&
 433                     nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
 434                         continue;
 435
 436                 if (tb[FRA_OIFNAME] &&
 437                     nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
 438                         continue;
 439
 440                 if (tb[FRA_FWMARK] &&
 441                     (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
 442                         continue;
 443
 444                 if (tb[FRA_FWMASK] &&
 445                     (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
 446                         continue;
 447
 448                 if (!ops->compare(rule, frh, tb))
 449                         continue;
 450
 451                 if (rule->flags & FIB_RULE_PERMANENT) {
 452                         err = -EPERM;
 453                         goto errout;
 454                 }
 455
 456                 list_del_rcu(&rule->list);
 457
 458                 if (rule->action == FR_ACT_GOTO)
 459                         ops->nr_goto_rules--;
 460
 461                 /*
 462                  * Check if this rule is a target to any of them. If so,
 463                  * disable them. As this operation is eventually very
 464                  * expensive, it is only performed if goto rules have
 465                  * actually been added.
 466                  */
 467                 if (ops->nr_goto_rules > 0) {
 468                         list_for_each_entry(tmp, &ops->rules_list, list) {
 469                                 if (tmp->ctarget == rule) {
 470                                         rcu_assign_pointer(tmp->ctarget, NULL);
 471                                         ops->unresolved_rules++;
 472                                 }
 473                         }
 474                 }
 475
 476                 synchronize_rcu();
 477                 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
 478                                    NETLINK_CB(skb).pid);
 479                 fib_rule_put(rule);
 480                 flush_route_cache(ops);
 481                 rules_ops_put(ops);
 482                 return 0;
 483         }
 484
 485         err = -ENOENT;
 486 errout:
 487         rules_ops_put(ops);
 488         return err;
 489 }
 490
 491 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
 492                                          struct fib_rule *rule)
 493 {
 494         size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
 495                          + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
 496                          + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
 497                          + nla_total_size(4) /* FRA_PRIORITY */
 498                          + nla_total_size(4) /* FRA_TABLE */
 499                          + nla_total_size(4) /* FRA_FWMARK */
 500                          + nla_total_size(4); /* FRA_FWMASK */
 501
 502         if (ops->nlmsg_payload)
 503                 payload += ops->nlmsg_payload(rule);
 504
 505         return payload;
 506 }
 507
 508 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
 509                             u32 pid, u32 seq, int type, int flags,
 510                             struct fib_rules_ops *ops)
 511 {
 512         struct nlmsghdr *nlh;
 513         struct fib_rule_hdr *frh;
 514
 515         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
 516         if (nlh == NULL)
 517                 return -EMSGSIZE;
 518
 519         frh = nlmsg_data(nlh);
 520         frh->table = rule->table;
 521         NLA_PUT_U32(skb, FRA_TABLE, rule->table);
 522         frh->res1 = 0;
 523         frh->res2 = 0;
 524         frh->action = rule->action;
 525         frh->flags = rule->flags;
 526
 527         if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL)
 528                 frh->flags |= FIB_RULE_UNRESOLVED;
 529
 530         if (rule->iifname[0]) {
 531                 NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
 532
 533                 if (rule->iifindex == -1)
 534                         frh->flags |= FIB_RULE_IIF_DETACHED;
 535         }
 536
 537         if (rule->oifname[0]) {
 538                 NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
 539
 540                 if (rule->oifindex == -1)
 541                         frh->flags |= FIB_RULE_OIF_DETACHED;
 542         }
 543
 544         if (rule->pref)
 545                 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
 546
 547         if (rule->mark)
 548                 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
 549
 550         if (rule->mark_mask || rule->mark)
 551                 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
 552
 553         if (rule->target)
 554                 NLA_PUT_U32(skb, FRA_GOTO, rule->target);
 555
 556         if (ops->fill(rule, skb, frh) < 0)
 557                 goto nla_put_failure;
 558
 559         return nlmsg_end(skb, nlh);
 560
 561 nla_put_failure:
 562         nlmsg_cancel(skb, nlh);
 563         return -EMSGSIZE;
 564 }
 565
 566 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
 567                       struct fib_rules_ops *ops)
 568 {
 569         int idx = 0;
 570         struct fib_rule *rule;
 571
 572         list_for_each_entry(rule, &ops->rules_list, list) {
 573                 if (idx < cb->args[1])
 574                         goto skip;
 575
 576                 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
 577                                      cb->nlh->nlmsg_seq, RTM_NEWRULE,
 578                                      NLM_F_MULTI, ops) < 0)
 579                         break;
 580 skip:
 581                 idx++;
 582         }
 583         cb->args[1] = idx;
 584         rules_ops_put(ops);
 585
 586         return skb->len;
 587 }
 588
 589 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
 590 {
 591         struct net *net = sock_net(skb->sk);
 592         struct fib_rules_ops *ops;
 593         int idx = 0, family;
 594
 595         family = rtnl_msg_family(cb->nlh);
 596         if (family != AF_UNSPEC) {
 597                 /* Protocol specific dump request */
 598                 ops = lookup_rules_ops(net, family);
 599                 if (ops == NULL)
 600                         return -EAFNOSUPPORT;
 601
 602                 return dump_rules(skb, cb, ops);
 603         }
 604
 605         rcu_read_lock();
 606         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
 607                 if (idx < cb->args[0] || !try_module_get(ops->owner))
 608                         goto skip;
 609
 610                 if (dump_rules(skb, cb, ops) < 0)
 611                         break;
 612
 613                 cb->args[1] = 0;
 614 skip:
 615                 idx++;
 616         }
 617         rcu_read_unlock();
 618         cb->args[0] = idx;
 619
 620         return skb->len;
 621 }
 622
 623 static void notify_rule_change(int event, struct fib_rule *rule,
 624                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
 625                                u32 pid)
 626 {
 627         struct net *net;
 628         struct sk_buff *skb;
 629         int err = -ENOBUFS;
 630
 631         net = ops->fro_net;
 632         skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
 633         if (skb == NULL)
 634                 goto errout;
 635
 636         err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
 637         if (err < 0) {
 638                 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
 639                 WARN_ON(err == -EMSGSIZE);
 640                 kfree_skb(skb);
 641                 goto errout;
 642         }
 643
 644         rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
 645         return;
 646 errout:
 647         if (err < 0)
 648                 rtnl_set_sk_err(net, ops->nlgroup, err);
 649 }
 650
 651 static void attach_rules(struct list_head *rules, struct net_device *dev)
 652 {
 653         struct fib_rule *rule;
 654
 655         list_for_each_entry(rule, rules, list) {
 656                 if (rule->iifindex == -1 &&
 657                     strcmp(dev->name, rule->iifname) == 0)
 658                         rule->iifindex = dev->ifindex;
 659                 if (rule->oifindex == -1 &&
 660                     strcmp(dev->name, rule->oifname) == 0)
 661                         rule->oifindex = dev->ifindex;
 662         }
 663 }
 664
 665 static void detach_rules(struct list_head *rules, struct net_device *dev)
 666 {
 667         struct fib_rule *rule;
 668
 669         list_for_each_entry(rule, rules, list) {
 670                 if (rule->iifindex == dev->ifindex)
 671                         rule->iifindex = -1;
 672                 if (rule->oifindex == dev->ifindex)
 673                         rule->oifindex = -1;
 674         }
 675 }
 676
 677
 678 static int fib_rules_event(struct notifier_block *this, unsigned long event,
 679                             void *ptr)
 680 {
 681         struct net_device *dev = ptr;
 682         struct net *net = dev_net(dev);
 683         struct fib_rules_ops *ops;
 684
 685         ASSERT_RTNL();
 686
 687         switch (event) {
 688         case NETDEV_REGISTER:
 689                 list_for_each_entry(ops, &net->rules_ops, list)
 690                         attach_rules(&ops->rules_list, dev);
 691                 break;
 692
 693         case NETDEV_UNREGISTER:
 694                 list_for_each_entry(ops, &net->rules_ops, list)
 695                         detach_rules(&ops->rules_list, dev);
 696                 break;
 697         }
 698
 699         return NOTIFY_DONE;
 700 }
 701
 702 static struct notifier_block fib_rules_notifier = {
 703         .notifier_call = fib_rules_event,
 704 };
 705
 706 static int __net_init fib_rules_net_init(struct net *net)
 707 {
 708         INIT_LIST_HEAD(&net->rules_ops);
 709         spin_lock_init(&net->rules_mod_lock);
 710         return 0;
 711 }
 712
 713 static struct pernet_operations fib_rules_net_ops = {
 714         .init = fib_rules_net_init,
 715 };
 716
 717 static int __init fib_rules_init(void)
 718 {
 719         int err;
 720         rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
 721         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
 722         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
 723
 724         err = register_pernet_subsys(&fib_rules_net_ops);
 725         if (err < 0)
 726                 goto fail;
 727
 728         err = register_netdevice_notifier(&fib_rules_notifier);
 729         if (err < 0)
 730                 goto fail_unregister;
 731
 732         return 0;
 733
 734 fail_unregister:
 735         unregister_pernet_subsys(&fib_rules_net_ops);
 736 fail:
 737         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
 738         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
 739         rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
 740         return err;
 741 }
 742
 743 subsys_initcall(fib_rules_init);