2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * IPv4 FIB: lookup engine and maintenance routines.
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <asm/uaccess.h>
17 #include <asm/system.h>
18 #include <linux/bitops.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/socket.h>
24 #include <linux/sockios.h>
25 #include <linux/errno.h>
27 #include <linux/inet.h>
28 #include <linux/inetdevice.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_arp.h>
31 #include <linux/proc_fs.h>
32 #include <linux/skbuff.h>
33 #include <linux/netlink.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
37 #include <net/net_namespace.h>
39 #include <net/protocol.h>
40 #include <net/route.h>
43 #include <net/ip_fib.h>
45 #include "fib_lookup.h"
47 static struct kmem_cache *fn_hash_kmem __read_mostly;
48 static struct kmem_cache *fn_alias_kmem __read_mostly;
51 struct hlist_node fn_hash;
52 struct list_head fn_alias;
54 struct fib_alias fn_embedded_alias;
58 struct fn_zone *fz_next; /* Next not empty zone */
59 struct hlist_head *fz_hash; /* Hash table pointer */
60 int fz_nent; /* Number of entries */
62 int fz_divisor; /* Hash divisor */
63 u32 fz_hashmask; /* (fz_divisor - 1) */
64 #define FZ_HASHMASK(fz) ((fz)->fz_hashmask)
66 int fz_order; /* Zone order */
68 #define FZ_MASK(fz) ((fz)->fz_mask)
71 /* NOTE. On fast computers evaluation of fz_hashmask and fz_mask
72 * can be cheaper than memory lookup, so that FZ_* macros are used.
76 struct fn_zone *fn_zones[33];
77 struct fn_zone *fn_zone_list;
80 static inline u32 fn_hash(__be32 key, struct fn_zone *fz)
82 u32 h = ntohl(key)>>(32 - fz->fz_order);
90 static inline __be32 fz_key(__be32 dst, struct fn_zone *fz)
92 return dst & FZ_MASK(fz);
95 static DEFINE_RWLOCK(fib_hash_lock);
96 static unsigned int fib_hash_genid;
98 #define FZ_MAX_DIVISOR ((PAGE_SIZE<<MAX_ORDER) / sizeof(struct hlist_head))
100 static struct hlist_head *fz_hash_alloc(int divisor)
102 unsigned long size = divisor * sizeof(struct hlist_head);
104 if (size <= PAGE_SIZE) {
105 return kzalloc(size, GFP_KERNEL);
107 return (struct hlist_head *)
108 __get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(size));
112 /* The fib hash lock must be held when this is called. */
113 static inline void fn_rebuild_zone(struct fn_zone *fz,
114 struct hlist_head *old_ht,
119 for (i = 0; i < old_divisor; i++) {
120 struct hlist_node *node, *n;
123 hlist_for_each_entry_safe(f, node, n, &old_ht[i], fn_hash) {
124 struct hlist_head *new_head;
126 hlist_del(&f->fn_hash);
128 new_head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
129 hlist_add_head(&f->fn_hash, new_head);
134 static void fz_hash_free(struct hlist_head *hash, int divisor)
136 unsigned long size = divisor * sizeof(struct hlist_head);
138 if (size <= PAGE_SIZE)
141 free_pages((unsigned long)hash, get_order(size));
144 static void fn_rehash_zone(struct fn_zone *fz)
146 struct hlist_head *ht, *old_ht;
147 int old_divisor, new_divisor;
150 old_divisor = fz->fz_divisor;
152 switch (old_divisor) {
160 if ((old_divisor << 1) > FZ_MAX_DIVISOR) {
161 printk(KERN_CRIT "route.c: bad divisor %d!\n", old_divisor);
164 new_divisor = (old_divisor << 1);
168 new_hashmask = (new_divisor - 1);
170 #if RT_CACHE_DEBUG >= 2
171 printk(KERN_DEBUG "fn_rehash_zone: hash for zone %d grows from %d\n",
172 fz->fz_order, old_divisor);
175 ht = fz_hash_alloc(new_divisor);
178 write_lock_bh(&fib_hash_lock);
179 old_ht = fz->fz_hash;
181 fz->fz_hashmask = new_hashmask;
182 fz->fz_divisor = new_divisor;
183 fn_rebuild_zone(fz, old_ht, old_divisor);
185 write_unlock_bh(&fib_hash_lock);
187 fz_hash_free(old_ht, old_divisor);
191 static inline void fn_free_node(struct fib_node * f)
193 kmem_cache_free(fn_hash_kmem, f);
196 static inline void fn_free_alias(struct fib_alias *fa, struct fib_node *f)
198 fib_release_info(fa->fa_info);
199 if (fa == &f->fn_embedded_alias)
202 kmem_cache_free(fn_alias_kmem, fa);
205 static struct fn_zone *
206 fn_new_zone(struct fn_hash *table, int z)
209 struct fn_zone *fz = kzalloc(sizeof(struct fn_zone), GFP_KERNEL);
218 fz->fz_hashmask = (fz->fz_divisor - 1);
219 fz->fz_hash = fz_hash_alloc(fz->fz_divisor);
225 fz->fz_mask = inet_make_mask(z);
227 /* Find the first not empty zone with more specific mask */
228 for (i=z+1; i<=32; i++)
229 if (table->fn_zones[i])
231 write_lock_bh(&fib_hash_lock);
233 /* No more specific masks, we are the first. */
234 fz->fz_next = table->fn_zone_list;
235 table->fn_zone_list = fz;
237 fz->fz_next = table->fn_zones[i]->fz_next;
238 table->fn_zones[i]->fz_next = fz;
240 table->fn_zones[z] = fz;
242 write_unlock_bh(&fib_hash_lock);
246 int fib_table_lookup(struct fib_table *tb,
247 const struct flowi *flp, struct fib_result *res,
252 struct fn_hash *t = (struct fn_hash *)tb->tb_data;
254 read_lock(&fib_hash_lock);
255 for (fz = t->fn_zone_list; fz; fz = fz->fz_next) {
256 struct hlist_head *head;
257 struct hlist_node *node;
259 __be32 k = fz_key(flp->fl4_dst, fz);
261 head = &fz->fz_hash[fn_hash(k, fz)];
262 hlist_for_each_entry(f, node, head, fn_hash) {
266 err = fib_semantic_match(&f->fn_alias,
268 fz->fz_order, fib_flags);
275 read_unlock(&fib_hash_lock);
279 void fib_table_select_default(struct fib_table *tb,
280 const struct flowi *flp, struct fib_result *res)
283 struct hlist_node *node;
285 struct fib_info *fi = NULL;
286 struct fib_info *last_resort;
287 struct fn_hash *t = (struct fn_hash *)tb->tb_data;
288 struct fn_zone *fz = t->fn_zones[0];
297 read_lock(&fib_hash_lock);
298 hlist_for_each_entry(f, node, &fz->fz_hash[0], fn_hash) {
299 struct fib_alias *fa;
301 list_for_each_entry(fa, &f->fn_alias, fa_list) {
302 struct fib_info *next_fi = fa->fa_info;
304 if (fa->fa_scope != res->scope ||
305 fa->fa_type != RTN_UNICAST)
308 if (next_fi->fib_priority > res->fi->fib_priority)
310 if (!next_fi->fib_nh[0].nh_gw ||
311 next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
313 fa->fa_state |= FA_S_ACCESSED;
316 if (next_fi != res->fi)
318 } else if (!fib_detect_death(fi, order, &last_resort,
319 &last_idx, tb->tb_default)) {
320 fib_result_assign(res, fi);
321 tb->tb_default = order;
329 if (order <= 0 || fi == NULL) {
334 if (!fib_detect_death(fi, order, &last_resort, &last_idx,
336 fib_result_assign(res, fi);
337 tb->tb_default = order;
342 fib_result_assign(res, last_resort);
343 tb->tb_default = last_idx;
345 read_unlock(&fib_hash_lock);
348 /* Insert node F to FZ. */
349 static inline void fib_insert_node(struct fn_zone *fz, struct fib_node *f)
351 struct hlist_head *head = &fz->fz_hash[fn_hash(f->fn_key, fz)];
353 hlist_add_head(&f->fn_hash, head);
356 /* Return the node in FZ matching KEY. */
357 static struct fib_node *fib_find_node(struct fn_zone *fz, __be32 key)
359 struct hlist_head *head = &fz->fz_hash[fn_hash(key, fz)];
360 struct hlist_node *node;
363 hlist_for_each_entry(f, node, head, fn_hash) {
364 if (f->fn_key == key)
371 int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
373 struct fn_hash *table = (struct fn_hash *) tb->tb_data;
374 struct fib_node *new_f = NULL;
376 struct fib_alias *fa, *new_fa;
379 u8 tos = cfg->fc_tos;
383 if (cfg->fc_dst_len > 32)
386 fz = table->fn_zones[cfg->fc_dst_len];
387 if (!fz && !(fz = fn_new_zone(table, cfg->fc_dst_len)))
392 if (cfg->fc_dst & ~FZ_MASK(fz))
394 key = fz_key(cfg->fc_dst, fz);
397 fi = fib_create_info(cfg);
401 if (fz->fz_nent > (fz->fz_divisor<<1) &&
402 fz->fz_divisor < FZ_MAX_DIVISOR &&
403 (cfg->fc_dst_len == 32 ||
404 (1 << cfg->fc_dst_len) > fz->fz_divisor))
407 f = fib_find_node(fz, key);
412 fa = fib_find_alias(&f->fn_alias, tos, fi->fib_priority);
414 /* Now fa, if non-NULL, points to the first fib alias
415 * with the same keys [prefix,tos,priority], if such key already
416 * exists or to the node before which we will insert new one.
418 * If fa is NULL, we will need to allocate a new one and
419 * insert to the head of f.
421 * If f is NULL, no fib node matched the destination key
422 * and we need to allocate a new one of those as well.
425 if (fa && fa->fa_tos == tos &&
426 fa->fa_info->fib_priority == fi->fib_priority) {
427 struct fib_alias *fa_first, *fa_match;
430 if (cfg->fc_nlflags & NLM_F_EXCL)
434 * 1. Find exact match for type, scope, fib_info to avoid
436 * 2. Find next 'fa' (or head), NLM_F_APPEND inserts before it
440 fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
441 list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
442 if (fa->fa_tos != tos)
444 if (fa->fa_info->fib_priority != fi->fib_priority)
446 if (fa->fa_type == cfg->fc_type &&
447 fa->fa_scope == cfg->fc_scope &&
454 if (cfg->fc_nlflags & NLM_F_REPLACE) {
455 struct fib_info *fi_drop;
464 write_lock_bh(&fib_hash_lock);
465 fi_drop = fa->fa_info;
467 fa->fa_type = cfg->fc_type;
468 fa->fa_scope = cfg->fc_scope;
469 state = fa->fa_state;
470 fa->fa_state &= ~FA_S_ACCESSED;
472 write_unlock_bh(&fib_hash_lock);
474 fib_release_info(fi_drop);
475 if (state & FA_S_ACCESSED)
476 rt_cache_flush(cfg->fc_nlinfo.nl_net, -1);
477 rtmsg_fib(RTM_NEWROUTE, key, fa, cfg->fc_dst_len, tb->tb_id,
478 &cfg->fc_nlinfo, NLM_F_REPLACE);
482 /* Error if we find a perfect match which
483 * uses the same scope, type, and nexthop
489 if (!(cfg->fc_nlflags & NLM_F_APPEND))
494 if (!(cfg->fc_nlflags & NLM_F_CREATE))
500 new_f = kmem_cache_zalloc(fn_hash_kmem, GFP_KERNEL);
504 INIT_HLIST_NODE(&new_f->fn_hash);
505 INIT_LIST_HEAD(&new_f->fn_alias);
510 new_fa = &f->fn_embedded_alias;
511 if (new_fa->fa_info != NULL) {
512 new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL);
516 new_fa->fa_info = fi;
517 new_fa->fa_tos = tos;
518 new_fa->fa_type = cfg->fc_type;
519 new_fa->fa_scope = cfg->fc_scope;
520 new_fa->fa_state = 0;
523 * Insert new entry to the list.
526 write_lock_bh(&fib_hash_lock);
528 fib_insert_node(fz, new_f);
529 list_add_tail(&new_fa->fa_list,
530 (fa ? &fa->fa_list : &f->fn_alias));
532 write_unlock_bh(&fib_hash_lock);
536 rt_cache_flush(cfg->fc_nlinfo.nl_net, -1);
538 rtmsg_fib(RTM_NEWROUTE, key, new_fa, cfg->fc_dst_len, tb->tb_id,
544 kmem_cache_free(fn_hash_kmem, new_f);
545 fib_release_info(fi);
549 int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
551 struct fn_hash *table = (struct fn_hash *)tb->tb_data;
553 struct fib_alias *fa, *fa_to_delete;
557 if (cfg->fc_dst_len > 32)
560 if ((fz = table->fn_zones[cfg->fc_dst_len]) == NULL)
565 if (cfg->fc_dst & ~FZ_MASK(fz))
567 key = fz_key(cfg->fc_dst, fz);
570 f = fib_find_node(fz, key);
575 fa = fib_find_alias(&f->fn_alias, cfg->fc_tos, 0);
580 fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
581 list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
582 struct fib_info *fi = fa->fa_info;
584 if (fa->fa_tos != cfg->fc_tos)
587 if ((!cfg->fc_type ||
588 fa->fa_type == cfg->fc_type) &&
589 (cfg->fc_scope == RT_SCOPE_NOWHERE ||
590 fa->fa_scope == cfg->fc_scope) &&
591 (!cfg->fc_protocol ||
592 fi->fib_protocol == cfg->fc_protocol) &&
593 fib_nh_match(cfg, fi) == 0) {
603 rtmsg_fib(RTM_DELROUTE, key, fa, cfg->fc_dst_len,
604 tb->tb_id, &cfg->fc_nlinfo, 0);
607 write_lock_bh(&fib_hash_lock);
608 list_del(&fa->fa_list);
609 if (list_empty(&f->fn_alias)) {
610 hlist_del(&f->fn_hash);
614 write_unlock_bh(&fib_hash_lock);
616 if (fa->fa_state & FA_S_ACCESSED)
617 rt_cache_flush(cfg->fc_nlinfo.nl_net, -1);
618 fn_free_alias(fa, f);
629 static int fn_flush_list(struct fn_zone *fz, int idx)
631 struct hlist_head *head = &fz->fz_hash[idx];
632 struct hlist_node *node, *n;
636 hlist_for_each_entry_safe(f, node, n, head, fn_hash) {
637 struct fib_alias *fa, *fa_node;
641 list_for_each_entry_safe(fa, fa_node, &f->fn_alias, fa_list) {
642 struct fib_info *fi = fa->fa_info;
644 if (fi && (fi->fib_flags&RTNH_F_DEAD)) {
645 write_lock_bh(&fib_hash_lock);
646 list_del(&fa->fa_list);
647 if (list_empty(&f->fn_alias)) {
648 hlist_del(&f->fn_hash);
652 write_unlock_bh(&fib_hash_lock);
654 fn_free_alias(fa, f);
666 int fib_table_flush(struct fib_table *tb)
668 struct fn_hash *table = (struct fn_hash *) tb->tb_data;
672 for (fz = table->fn_zone_list; fz; fz = fz->fz_next) {
675 for (i = fz->fz_divisor - 1; i >= 0; i--)
676 found += fn_flush_list(fz, i);
683 fn_hash_dump_bucket(struct sk_buff *skb, struct netlink_callback *cb,
684 struct fib_table *tb,
686 struct hlist_head *head)
688 struct hlist_node *node;
694 hlist_for_each_entry(f, node, head, fn_hash) {
695 struct fib_alias *fa;
697 list_for_each_entry(fa, &f->fn_alias, fa_list) {
701 if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
724 fn_hash_dump_zone(struct sk_buff *skb, struct netlink_callback *cb,
725 struct fib_table *tb,
730 if (fz->fz_hash == NULL)
733 for (h = s_h; h < fz->fz_divisor; h++) {
734 if (hlist_empty(&fz->fz_hash[h]))
736 if (fn_hash_dump_bucket(skb, cb, tb, fz, &fz->fz_hash[h]) < 0) {
740 memset(&cb->args[4], 0,
741 sizeof(cb->args) - 4*sizeof(cb->args[0]));
747 int fib_table_dump(struct fib_table *tb, struct sk_buff *skb,
748 struct netlink_callback *cb)
752 struct fn_hash *table = (struct fn_hash *)tb->tb_data;
755 read_lock(&fib_hash_lock);
756 for (fz = table->fn_zone_list, m=0; fz; fz = fz->fz_next, m++) {
757 if (m < s_m) continue;
758 if (fn_hash_dump_zone(skb, cb, tb, fz) < 0) {
760 read_unlock(&fib_hash_lock);
763 memset(&cb->args[3], 0,
764 sizeof(cb->args) - 3*sizeof(cb->args[0]));
766 read_unlock(&fib_hash_lock);
771 void __init fib_hash_init(void)
773 fn_hash_kmem = kmem_cache_create("ip_fib_hash", sizeof(struct fib_node),
774 0, SLAB_PANIC, NULL);
776 fn_alias_kmem = kmem_cache_create("ip_fib_alias", sizeof(struct fib_alias),
777 0, SLAB_PANIC, NULL);
781 struct fib_table *fib_hash_table(u32 id)
783 struct fib_table *tb;
785 tb = kmalloc(sizeof(struct fib_table) + sizeof(struct fn_hash),
793 memset(tb->tb_data, 0, sizeof(struct fn_hash));
797 /* ------------------------------------------------------------------------ */
798 #ifdef CONFIG_PROC_FS
800 struct fib_iter_state {
801 struct seq_net_private p;
802 struct fn_zone *zone;
804 struct hlist_head *hash_head;
806 struct fib_alias *fa;
812 static struct fib_alias *fib_get_first(struct seq_file *seq)
814 struct fib_iter_state *iter = seq->private;
815 struct fib_table *main_table;
816 struct fn_hash *table;
818 main_table = fib_get_table(seq_file_net(seq), RT_TABLE_MAIN);
819 table = (struct fn_hash *)main_table->tb_data;
822 iter->hash_head = NULL;
826 iter->genid = fib_hash_genid;
829 for (iter->zone = table->fn_zone_list; iter->zone;
830 iter->zone = iter->zone->fz_next) {
833 if (!iter->zone->fz_nent)
836 iter->hash_head = iter->zone->fz_hash;
837 maxslot = iter->zone->fz_divisor;
839 for (iter->bucket = 0; iter->bucket < maxslot;
840 ++iter->bucket, ++iter->hash_head) {
841 struct hlist_node *node;
844 hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) {
845 struct fib_alias *fa;
847 list_for_each_entry(fa, &fn->fn_alias, fa_list) {
859 static struct fib_alias *fib_get_next(struct seq_file *seq)
861 struct fib_iter_state *iter = seq->private;
863 struct fib_alias *fa;
865 /* Advance FA, if any. */
870 list_for_each_entry_continue(fa, &fn->fn_alias, fa_list) {
876 fa = iter->fa = NULL;
880 struct hlist_node *node = &fn->fn_hash;
881 hlist_for_each_entry_continue(fn, node, fn_hash) {
884 list_for_each_entry(fa, &fn->fn_alias, fa_list) {
891 fn = iter->fn = NULL;
893 /* Advance hash chain. */
898 struct hlist_node *node;
901 maxslot = iter->zone->fz_divisor;
903 while (++iter->bucket < maxslot) {
906 hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) {
907 list_for_each_entry(fa, &fn->fn_alias, fa_list) {
915 iter->zone = iter->zone->fz_next;
921 iter->hash_head = iter->zone->fz_hash;
923 hlist_for_each_entry(fn, node, iter->hash_head, fn_hash) {
924 list_for_each_entry(fa, &fn->fn_alias, fa_list) {
936 static struct fib_alias *fib_get_idx(struct seq_file *seq, loff_t pos)
938 struct fib_iter_state *iter = seq->private;
939 struct fib_alias *fa;
941 if (iter->valid && pos >= iter->pos && iter->genid == fib_hash_genid) {
945 fa = fib_get_first(seq);
948 while (pos && (fa = fib_get_next(seq)))
950 return pos ? NULL : fa;
953 static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
954 __acquires(fib_hash_lock)
958 read_lock(&fib_hash_lock);
959 if (fib_get_table(seq_file_net(seq), RT_TABLE_MAIN))
960 v = *pos ? fib_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
964 static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos)
967 return v == SEQ_START_TOKEN ? fib_get_first(seq) : fib_get_next(seq);
970 static void fib_seq_stop(struct seq_file *seq, void *v)
971 __releases(fib_hash_lock)
973 read_unlock(&fib_hash_lock);
976 static unsigned fib_flag_trans(int type, __be32 mask, struct fib_info *fi)
978 static const unsigned type2flags[RTN_MAX + 1] = {
979 [7] = RTF_REJECT, [8] = RTF_REJECT,
981 unsigned flags = type2flags[type];
983 if (fi && fi->fib_nh->nh_gw)
984 flags |= RTF_GATEWAY;
985 if (mask == htonl(0xFFFFFFFF))
992 * This outputs /proc/net/route.
994 * It always works in backward compatibility mode.
995 * The format of the file is not supposed to be changed.
997 static int fib_seq_show(struct seq_file *seq, void *v)
999 struct fib_iter_state *iter;
1001 __be32 prefix, mask;
1004 struct fib_alias *fa;
1005 struct fib_info *fi;
1007 if (v == SEQ_START_TOKEN) {
1008 seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
1009 "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
1014 iter = seq->private;
1019 mask = FZ_MASK(iter->zone);
1020 flags = fib_flag_trans(fa->fa_type, mask, fi);
1023 "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u%n",
1024 fi->fib_dev ? fi->fib_dev->name : "*", prefix,
1025 fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
1026 mask, (fi->fib_advmss ? fi->fib_advmss + 40 : 0),
1028 fi->fib_rtt >> 3, &len);
1031 "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u%n",
1032 prefix, 0, flags, 0, 0, 0, mask, 0, 0, 0, &len);
1034 seq_printf(seq, "%*s\n", 127 - len, "");
1039 static const struct seq_operations fib_seq_ops = {
1040 .start = fib_seq_start,
1041 .next = fib_seq_next,
1042 .stop = fib_seq_stop,
1043 .show = fib_seq_show,
1046 static int fib_seq_open(struct inode *inode, struct file *file)
1048 return seq_open_net(inode, file, &fib_seq_ops,
1049 sizeof(struct fib_iter_state));
1052 static const struct file_operations fib_seq_fops = {
1053 .owner = THIS_MODULE,
1054 .open = fib_seq_open,
1056 .llseek = seq_lseek,
1057 .release = seq_release_net,
1060 int __net_init fib_proc_init(struct net *net)
1062 if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_seq_fops))
1067 void __net_exit fib_proc_exit(struct net *net)
1069 proc_net_remove(net, "route");
1071 #endif /* CONFIG_PROC_FS */