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 u32 fib_default_rule_pref(struct fib_rules_ops *ops) 43 { 44 struct list_head *pos; 45 struct fib_rule *rule; 46 47 if (!list_empty(&ops->rules_list)) { 48 pos = ops->rules_list.next; 49 if (pos->next != &ops->rules_list) { 50 rule = list_entry(pos->next, struct fib_rule, list); 51 if (rule->pref) 52 return rule->pref - 1; 53 } 54 } 55 56 return 0; 57 } 58 EXPORT_SYMBOL(fib_default_rule_pref); 59 60 static void notify_rule_change(int event, struct fib_rule *rule, 61 struct fib_rules_ops *ops, struct nlmsghdr *nlh, 62 u32 pid); 63 64 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family) 65 { 66 struct fib_rules_ops *ops; 67 68 rcu_read_lock(); 69 list_for_each_entry_rcu(ops, &net->rules_ops, list) { 70 if (ops->family == family) { 71 if (!try_module_get(ops->owner)) 72 ops = NULL; 73 rcu_read_unlock(); 74 return ops; 75 } 76 } 77 rcu_read_unlock(); 78 79 return NULL; 80 } 81 82 static void rules_ops_put(struct fib_rules_ops *ops) 83 { 84 if (ops) 85 module_put(ops->owner); 86 } 87 88 static void flush_route_cache(struct fib_rules_ops *ops) 89 { 90 if (ops->flush_cache) 91 ops->flush_cache(ops); 92 } 93 94 static int __fib_rules_register(struct fib_rules_ops *ops) 95 { 96 int err = -EEXIST; 97 struct fib_rules_ops *o; 98 struct net *net; 99 100 net = ops->fro_net; 101 102 if (ops->rule_size < sizeof(struct fib_rule)) 103 return -EINVAL; 104 105 if (ops->match == NULL || ops->configure == NULL || 106 ops->compare == NULL || ops->fill == NULL || 107 ops->action == NULL) 108 return -EINVAL; 109 110 spin_lock(&net->rules_mod_lock); 111 list_for_each_entry(o, &net->rules_ops, list) 112 if (ops->family == o->family) 113 goto errout; 114 115 hold_net(net); 116 list_add_tail_rcu(&ops->list, &net->rules_ops); 117 err = 0; 118 errout: 119 spin_unlock(&net->rules_mod_lock); 120 121 return err; 122 } 123 124 struct fib_rules_ops * 125 fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net) 126 { 127 struct fib_rules_ops *ops; 128 int err; 129 130 ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL); 131 if (ops == NULL) 132 return ERR_PTR(-ENOMEM); 133 134 INIT_LIST_HEAD(&ops->rules_list); 135 ops->fro_net = net; 136 137 err = __fib_rules_register(ops); 138 if (err) { 139 kfree(ops); 140 ops = ERR_PTR(err); 141 } 142 143 return ops; 144 } 145 EXPORT_SYMBOL_GPL(fib_rules_register); 146 147 static void fib_rules_cleanup_ops(struct fib_rules_ops *ops) 148 { 149 struct fib_rule *rule, *tmp; 150 151 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) { 152 list_del_rcu(&rule->list); 153 fib_rule_put(rule); 154 } 155 } 156 157 static void fib_rules_put_rcu(struct rcu_head *head) 158 { 159 struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu); 160 struct net *net = ops->fro_net; 161 162 release_net(net); 163 kfree(ops); 164 } 165 166 void fib_rules_unregister(struct fib_rules_ops *ops) 167 { 168 struct net *net = ops->fro_net; 169 170 spin_lock(&net->rules_mod_lock); 171 list_del_rcu(&ops->list); 172 fib_rules_cleanup_ops(ops); 173 spin_unlock(&net->rules_mod_lock); 174 175 call_rcu(&ops->rcu, fib_rules_put_rcu); 176 } 177 EXPORT_SYMBOL_GPL(fib_rules_unregister); 178 179 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, 180 struct flowi *fl, int flags) 181 { 182 int ret = 0; 183 184 if (rule->iifindex && (rule->iifindex != fl->flowi_iif)) 185 goto out; 186 187 if (rule->oifindex && (rule->oifindex != fl->flowi_oif)) 188 goto out; 189 190 if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask) 191 goto out; 192 193 ret = ops->match(rule, fl, flags); 194 out: 195 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; 196 } 197 198 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl, 199 int flags, struct fib_lookup_arg *arg) 200 { 201 struct fib_rule *rule; 202 int err; 203 204 rcu_read_lock(); 205 206 list_for_each_entry_rcu(rule, &ops->rules_list, list) { 207 jumped: 208 if (!fib_rule_match(rule, ops, fl, flags)) 209 continue; 210 211 if (rule->action == FR_ACT_GOTO) { 212 struct fib_rule *target; 213 214 target = rcu_dereference(rule->ctarget); 215 if (target == NULL) { 216 continue; 217 } else { 218 rule = target; 219 goto jumped; 220 } 221 } else if (rule->action == FR_ACT_NOP) 222 continue; 223 else 224 err = ops->action(rule, fl, flags, arg); 225 226 if (err != -EAGAIN) { 227 if ((arg->flags & FIB_LOOKUP_NOREF) || 228 likely(atomic_inc_not_zero(&rule->refcnt))) { 229 arg->rule = rule; 230 goto out; 231 } 232 break; 233 } 234 } 235 236 err = -ESRCH; 237 out: 238 rcu_read_unlock(); 239 240 return err; 241 } 242 EXPORT_SYMBOL_GPL(fib_rules_lookup); 243 244 static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb, 245 struct fib_rules_ops *ops) 246 { 247 int err = -EINVAL; 248 249 if (frh->src_len) 250 if (tb[FRA_SRC] == NULL || 251 frh->src_len > (ops->addr_size * 8) || 252 nla_len(tb[FRA_SRC]) != ops->addr_size) 253 goto errout; 254 255 if (frh->dst_len) 256 if (tb[FRA_DST] == NULL || 257 frh->dst_len > (ops->addr_size * 8) || 258 nla_len(tb[FRA_DST]) != ops->addr_size) 259 goto errout; 260 261 err = 0; 262 errout: 263 return err; 264 } 265 266 static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 267 { 268 struct net *net = sock_net(skb->sk); 269 struct fib_rule_hdr *frh = nlmsg_data(nlh); 270 struct fib_rules_ops *ops = NULL; 271 struct fib_rule *rule, *r, *last = NULL; 272 struct nlattr *tb[FRA_MAX+1]; 273 int err = -EINVAL, unresolved = 0; 274 275 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) 276 goto errout; 277 278 ops = lookup_rules_ops(net, frh->family); 279 if (ops == NULL) { 280 err = -EAFNOSUPPORT; 281 goto errout; 282 } 283 284 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); 285 if (err < 0) 286 goto errout; 287 288 err = validate_rulemsg(frh, tb, ops); 289 if (err < 0) 290 goto errout; 291 292 rule = kzalloc(ops->rule_size, GFP_KERNEL); 293 if (rule == NULL) { 294 err = -ENOMEM; 295 goto errout; 296 } 297 rule->fr_net = hold_net(net); 298 299 if (tb[FRA_PRIORITY]) 300 rule->pref = nla_get_u32(tb[FRA_PRIORITY]); 301 302 if (tb[FRA_IIFNAME]) { 303 struct net_device *dev; 304 305 rule->iifindex = -1; 306 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ); 307 dev = __dev_get_by_name(net, rule->iifname); 308 if (dev) 309 rule->iifindex = dev->ifindex; 310 } 311 312 if (tb[FRA_OIFNAME]) { 313 struct net_device *dev; 314 315 rule->oifindex = -1; 316 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ); 317 dev = __dev_get_by_name(net, rule->oifname); 318 if (dev) 319 rule->oifindex = dev->ifindex; 320 } 321 322 if (tb[FRA_FWMARK]) { 323 rule->mark = nla_get_u32(tb[FRA_FWMARK]); 324 if (rule->mark) 325 /* compatibility: if the mark value is non-zero all bits 326 * are compared unless a mask is explicitly specified. 327 */ 328 rule->mark_mask = 0xFFFFFFFF; 329 } 330 331 if (tb[FRA_FWMASK]) 332 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]); 333 334 rule->action = frh->action; 335 rule->flags = frh->flags; 336 rule->table = frh_get_table(frh, tb); 337 338 if (!tb[FRA_PRIORITY] && ops->default_pref) 339 rule->pref = ops->default_pref(ops); 340 341 err = -EINVAL; 342 if (tb[FRA_GOTO]) { 343 if (rule->action != FR_ACT_GOTO) 344 goto errout_free; 345 346 rule->target = nla_get_u32(tb[FRA_GOTO]); 347 /* Backward jumps are prohibited to avoid endless loops */ 348 if (rule->target <= rule->pref) 349 goto errout_free; 350 351 list_for_each_entry(r, &ops->rules_list, list) { 352 if (r->pref == rule->target) { 353 RCU_INIT_POINTER(rule->ctarget, r); 354 break; 355 } 356 } 357 358 if (rcu_dereference_protected(rule->ctarget, 1) == NULL) 359 unresolved = 1; 360 } else if (rule->action == FR_ACT_GOTO) 361 goto errout_free; 362 363 err = ops->configure(rule, skb, frh, tb); 364 if (err < 0) 365 goto errout_free; 366 367 list_for_each_entry(r, &ops->rules_list, list) { 368 if (r->pref > rule->pref) 369 break; 370 last = r; 371 } 372 373 fib_rule_get(rule); 374 375 if (last) 376 list_add_rcu(&rule->list, &last->list); 377 else 378 list_add_rcu(&rule->list, &ops->rules_list); 379 380 if (ops->unresolved_rules) { 381 /* 382 * There are unresolved goto rules in the list, check if 383 * any of them are pointing to this new rule. 384 */ 385 list_for_each_entry(r, &ops->rules_list, list) { 386 if (r->action == FR_ACT_GOTO && 387 r->target == rule->pref) { 388 BUG_ON(rtnl_dereference(r->ctarget) != NULL); 389 rcu_assign_pointer(r->ctarget, rule); 390 if (--ops->unresolved_rules == 0) 391 break; 392 } 393 } 394 } 395 396 if (rule->action == FR_ACT_GOTO) 397 ops->nr_goto_rules++; 398 399 if (unresolved) 400 ops->unresolved_rules++; 401 402 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid); 403 flush_route_cache(ops); 404 rules_ops_put(ops); 405 return 0; 406 407 errout_free: 408 release_net(rule->fr_net); 409 kfree(rule); 410 errout: 411 rules_ops_put(ops); 412 return err; 413 } 414 415 static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 416 { 417 struct net *net = sock_net(skb->sk); 418 struct fib_rule_hdr *frh = nlmsg_data(nlh); 419 struct fib_rules_ops *ops = NULL; 420 struct fib_rule *rule, *tmp; 421 struct nlattr *tb[FRA_MAX+1]; 422 int err = -EINVAL; 423 424 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) 425 goto errout; 426 427 ops = lookup_rules_ops(net, frh->family); 428 if (ops == NULL) { 429 err = -EAFNOSUPPORT; 430 goto errout; 431 } 432 433 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); 434 if (err < 0) 435 goto errout; 436 437 err = validate_rulemsg(frh, tb, ops); 438 if (err < 0) 439 goto errout; 440 441 list_for_each_entry(rule, &ops->rules_list, list) { 442 if (frh->action && (frh->action != rule->action)) 443 continue; 444 445 if (frh->table && (frh_get_table(frh, tb) != rule->table)) 446 continue; 447 448 if (tb[FRA_PRIORITY] && 449 (rule->pref != nla_get_u32(tb[FRA_PRIORITY]))) 450 continue; 451 452 if (tb[FRA_IIFNAME] && 453 nla_strcmp(tb[FRA_IIFNAME], rule->iifname)) 454 continue; 455 456 if (tb[FRA_OIFNAME] && 457 nla_strcmp(tb[FRA_OIFNAME], rule->oifname)) 458 continue; 459 460 if (tb[FRA_FWMARK] && 461 (rule->mark != nla_get_u32(tb[FRA_FWMARK]))) 462 continue; 463 464 if (tb[FRA_FWMASK] && 465 (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK]))) 466 continue; 467 468 if (!ops->compare(rule, frh, tb)) 469 continue; 470 471 if (rule->flags & FIB_RULE_PERMANENT) { 472 err = -EPERM; 473 goto errout; 474 } 475 476 list_del_rcu(&rule->list); 477 478 if (rule->action == FR_ACT_GOTO) 479 ops->nr_goto_rules--; 480 481 /* 482 * Check if this rule is a target to any of them. If so, 483 * disable them. As this operation is eventually very 484 * expensive, it is only performed if goto rules have 485 * actually been added. 486 */ 487 if (ops->nr_goto_rules > 0) { 488 list_for_each_entry(tmp, &ops->rules_list, list) { 489 if (rtnl_dereference(tmp->ctarget) == rule) { 490 rcu_assign_pointer(tmp->ctarget, NULL); 491 ops->unresolved_rules++; 492 } 493 } 494 } 495 496 notify_rule_change(RTM_DELRULE, rule, ops, nlh, 497 NETLINK_CB(skb).pid); 498 fib_rule_put(rule); 499 flush_route_cache(ops); 500 rules_ops_put(ops); 501 return 0; 502 } 503 504 err = -ENOENT; 505 errout: 506 rules_ops_put(ops); 507 return err; 508 } 509 510 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, 511 struct fib_rule *rule) 512 { 513 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) 514 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */ 515 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */ 516 + nla_total_size(4) /* FRA_PRIORITY */ 517 + nla_total_size(4) /* FRA_TABLE */ 518 + nla_total_size(4) /* FRA_FWMARK */ 519 + nla_total_size(4); /* FRA_FWMASK */ 520 521 if (ops->nlmsg_payload) 522 payload += ops->nlmsg_payload(rule); 523 524 return payload; 525 } 526 527 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, 528 u32 pid, u32 seq, int type, int flags, 529 struct fib_rules_ops *ops) 530 { 531 struct nlmsghdr *nlh; 532 struct fib_rule_hdr *frh; 533 534 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); 535 if (nlh == NULL) 536 return -EMSGSIZE; 537 538 frh = nlmsg_data(nlh); 539 frh->family = ops->family; 540 frh->table = rule->table; 541 NLA_PUT_U32(skb, FRA_TABLE, rule->table); 542 frh->res1 = 0; 543 frh->res2 = 0; 544 frh->action = rule->action; 545 frh->flags = rule->flags; 546 547 if (rule->action == FR_ACT_GOTO && 548 rcu_dereference_raw(rule->ctarget) == NULL) 549 frh->flags |= FIB_RULE_UNRESOLVED; 550 551 if (rule->iifname[0]) { 552 NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname); 553 554 if (rule->iifindex == -1) 555 frh->flags |= FIB_RULE_IIF_DETACHED; 556 } 557 558 if (rule->oifname[0]) { 559 NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname); 560 561 if (rule->oifindex == -1) 562 frh->flags |= FIB_RULE_OIF_DETACHED; 563 } 564 565 if (rule->pref) 566 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref); 567 568 if (rule->mark) 569 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark); 570 571 if (rule->mark_mask || rule->mark) 572 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask); 573 574 if (rule->target) 575 NLA_PUT_U32(skb, FRA_GOTO, rule->target); 576 577 if (ops->fill(rule, skb, frh) < 0) 578 goto nla_put_failure; 579 580 return nlmsg_end(skb, nlh); 581 582 nla_put_failure: 583 nlmsg_cancel(skb, nlh); 584 return -EMSGSIZE; 585 } 586 587 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, 588 struct fib_rules_ops *ops) 589 { 590 int idx = 0; 591 struct fib_rule *rule; 592 593 list_for_each_entry(rule, &ops->rules_list, list) { 594 if (idx < cb->args[1]) 595 goto skip; 596 597 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid, 598 cb->nlh->nlmsg_seq, RTM_NEWRULE, 599 NLM_F_MULTI, ops) < 0) 600 break; 601 skip: 602 idx++; 603 } 604 cb->args[1] = idx; 605 rules_ops_put(ops); 606 607 return skb->len; 608 } 609 610 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) 611 { 612 struct net *net = sock_net(skb->sk); 613 struct fib_rules_ops *ops; 614 int idx = 0, family; 615 616 family = rtnl_msg_family(cb->nlh); 617 if (family != AF_UNSPEC) { 618 /* Protocol specific dump request */ 619 ops = lookup_rules_ops(net, family); 620 if (ops == NULL) 621 return -EAFNOSUPPORT; 622 623 return dump_rules(skb, cb, ops); 624 } 625 626 rcu_read_lock(); 627 list_for_each_entry_rcu(ops, &net->rules_ops, list) { 628 if (idx < cb->args[0] || !try_module_get(ops->owner)) 629 goto skip; 630 631 if (dump_rules(skb, cb, ops) < 0) 632 break; 633 634 cb->args[1] = 0; 635 skip: 636 idx++; 637 } 638 rcu_read_unlock(); 639 cb->args[0] = idx; 640 641 return skb->len; 642 } 643 644 static void notify_rule_change(int event, struct fib_rule *rule, 645 struct fib_rules_ops *ops, struct nlmsghdr *nlh, 646 u32 pid) 647 { 648 struct net *net; 649 struct sk_buff *skb; 650 int err = -ENOBUFS; 651 652 net = ops->fro_net; 653 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); 654 if (skb == NULL) 655 goto errout; 656 657 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); 658 if (err < 0) { 659 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ 660 WARN_ON(err == -EMSGSIZE); 661 kfree_skb(skb); 662 goto errout; 663 } 664 665 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL); 666 return; 667 errout: 668 if (err < 0) 669 rtnl_set_sk_err(net, ops->nlgroup, err); 670 } 671 672 static void attach_rules(struct list_head *rules, struct net_device *dev) 673 { 674 struct fib_rule *rule; 675 676 list_for_each_entry(rule, rules, list) { 677 if (rule->iifindex == -1 && 678 strcmp(dev->name, rule->iifname) == 0) 679 rule->iifindex = dev->ifindex; 680 if (rule->oifindex == -1 && 681 strcmp(dev->name, rule->oifname) == 0) 682 rule->oifindex = dev->ifindex; 683 } 684 } 685 686 static void detach_rules(struct list_head *rules, struct net_device *dev) 687 { 688 struct fib_rule *rule; 689 690 list_for_each_entry(rule, rules, list) { 691 if (rule->iifindex == dev->ifindex) 692 rule->iifindex = -1; 693 if (rule->oifindex == dev->ifindex) 694 rule->oifindex = -1; 695 } 696 } 697 698 699 static int fib_rules_event(struct notifier_block *this, unsigned long event, 700 void *ptr) 701 { 702 struct net_device *dev = ptr; 703 struct net *net = dev_net(dev); 704 struct fib_rules_ops *ops; 705 706 ASSERT_RTNL(); 707 708 switch (event) { 709 case NETDEV_REGISTER: 710 list_for_each_entry(ops, &net->rules_ops, list) 711 attach_rules(&ops->rules_list, dev); 712 break; 713 714 case NETDEV_UNREGISTER: 715 list_for_each_entry(ops, &net->rules_ops, list) 716 detach_rules(&ops->rules_list, dev); 717 break; 718 } 719 720 return NOTIFY_DONE; 721 } 722 723 static struct notifier_block fib_rules_notifier = { 724 .notifier_call = fib_rules_event, 725 }; 726 727 static int __net_init fib_rules_net_init(struct net *net) 728 { 729 INIT_LIST_HEAD(&net->rules_ops); 730 spin_lock_init(&net->rules_mod_lock); 731 return 0; 732 } 733 734 static struct pernet_operations fib_rules_net_ops = { 735 .init = fib_rules_net_init, 736 }; 737 738 static int __init fib_rules_init(void) 739 { 740 int err; 741 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL); 742 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL); 743 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule); 744 745 err = register_pernet_subsys(&fib_rules_net_ops); 746 if (err < 0) 747 goto fail; 748 749 err = register_netdevice_notifier(&fib_rules_notifier); 750 if (err < 0) 751 goto fail_unregister; 752 753 return 0; 754 755 fail_unregister: 756 unregister_pernet_subsys(&fib_rules_net_ops); 757 fail: 758 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE); 759 rtnl_unregister(PF_UNSPEC, RTM_DELRULE); 760 rtnl_unregister(PF_UNSPEC, RTM_GETRULE); 761 return err; 762 } 763 764 subsys_initcall(fib_rules_init); 765