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 * Version: $Id: fib_hash.c,v 1.13 2001/10/31 21:55:54 davem Exp $
10 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
18 #include <asm/uaccess.h>
19 #include <asm/system.h>
20 #include <linux/bitops.h>
21 #include <linux/types.h>
22 #include <linux/kernel.h>
24 #include <linux/string.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/errno.h>
29 #include <linux/inet.h>
30 #include <linux/inetdevice.h>
31 #include <linux/netdevice.h>
32 #include <linux/if_arp.h>
33 #include <linux/proc_fs.h>
34 #include <linux/skbuff.h>
35 #include <linux/netlink.h>
36 #include <linux/init.h>
38 #include <net/net_namespace.h>
40 #include <net/protocol.h>
41 #include <net/route.h>
44 #include <net/ip_fib.h>
46 #include "fib_lookup.h"
48 static struct kmem_cache
*fn_hash_kmem __read_mostly
;
49 static struct kmem_cache
*fn_alias_kmem __read_mostly
;
52 struct hlist_node fn_hash
;
53 struct list_head fn_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("fn_rehash_zone: hash for zone %d grows from %d\n", fz
->fz_order
, old_divisor
);
174 ht
= fz_hash_alloc(new_divisor
);
177 write_lock_bh(&fib_hash_lock
);
178 old_ht
= fz
->fz_hash
;
180 fz
->fz_hashmask
= new_hashmask
;
181 fz
->fz_divisor
= new_divisor
;
182 fn_rebuild_zone(fz
, old_ht
, old_divisor
);
184 write_unlock_bh(&fib_hash_lock
);
186 fz_hash_free(old_ht
, old_divisor
);
190 static inline void fn_free_node(struct fib_node
* f
)
192 kmem_cache_free(fn_hash_kmem
, f
);
195 static inline void fn_free_alias(struct fib_alias
*fa
)
197 fib_release_info(fa
->fa_info
);
198 kmem_cache_free(fn_alias_kmem
, fa
);
201 static struct fn_zone
*
202 fn_new_zone(struct fn_hash
*table
, int z
)
205 struct fn_zone
*fz
= kzalloc(sizeof(struct fn_zone
), GFP_KERNEL
);
214 fz
->fz_hashmask
= (fz
->fz_divisor
- 1);
215 fz
->fz_hash
= fz_hash_alloc(fz
->fz_divisor
);
221 fz
->fz_mask
= inet_make_mask(z
);
223 /* Find the first not empty zone with more specific mask */
224 for (i
=z
+1; i
<=32; i
++)
225 if (table
->fn_zones
[i
])
227 write_lock_bh(&fib_hash_lock
);
229 /* No more specific masks, we are the first. */
230 fz
->fz_next
= table
->fn_zone_list
;
231 table
->fn_zone_list
= fz
;
233 fz
->fz_next
= table
->fn_zones
[i
]->fz_next
;
234 table
->fn_zones
[i
]->fz_next
= fz
;
236 table
->fn_zones
[z
] = fz
;
238 write_unlock_bh(&fib_hash_lock
);
243 fn_hash_lookup(struct fib_table
*tb
, const struct flowi
*flp
, struct fib_result
*res
)
247 struct fn_hash
*t
= (struct fn_hash
*)tb
->tb_data
;
249 read_lock(&fib_hash_lock
);
250 for (fz
= t
->fn_zone_list
; fz
; fz
= fz
->fz_next
) {
251 struct hlist_head
*head
;
252 struct hlist_node
*node
;
254 __be32 k
= fz_key(flp
->fl4_dst
, fz
);
256 head
= &fz
->fz_hash
[fn_hash(k
, fz
)];
257 hlist_for_each_entry(f
, node
, head
, fn_hash
) {
261 err
= fib_semantic_match(&f
->fn_alias
,
263 f
->fn_key
, fz
->fz_mask
,
271 read_unlock(&fib_hash_lock
);
275 static int fn_hash_last_dflt
=-1;
278 fn_hash_select_default(struct fib_table
*tb
, const struct flowi
*flp
, struct fib_result
*res
)
281 struct hlist_node
*node
;
283 struct fib_info
*fi
= NULL
;
284 struct fib_info
*last_resort
;
285 struct fn_hash
*t
= (struct fn_hash
*)tb
->tb_data
;
286 struct fn_zone
*fz
= t
->fn_zones
[0];
295 read_lock(&fib_hash_lock
);
296 hlist_for_each_entry(f
, node
, &fz
->fz_hash
[0], fn_hash
) {
297 struct fib_alias
*fa
;
299 list_for_each_entry(fa
, &f
->fn_alias
, fa_list
) {
300 struct fib_info
*next_fi
= fa
->fa_info
;
302 if (fa
->fa_scope
!= res
->scope
||
303 fa
->fa_type
!= RTN_UNICAST
)
306 if (next_fi
->fib_priority
> res
->fi
->fib_priority
)
308 if (!next_fi
->fib_nh
[0].nh_gw
||
309 next_fi
->fib_nh
[0].nh_scope
!= RT_SCOPE_LINK
)
311 fa
->fa_state
|= FA_S_ACCESSED
;
314 if (next_fi
!= res
->fi
)
316 } else if (!fib_detect_death(fi
, order
, &last_resort
,
317 &last_idx
, &fn_hash_last_dflt
)) {
319 fib_info_put(res
->fi
);
321 atomic_inc(&fi
->fib_clntref
);
322 fn_hash_last_dflt
= order
;
330 if (order
<= 0 || fi
== NULL
) {
331 fn_hash_last_dflt
= -1;
335 if (!fib_detect_death(fi
, order
, &last_resort
, &last_idx
, &fn_hash_last_dflt
)) {
337 fib_info_put(res
->fi
);
339 atomic_inc(&fi
->fib_clntref
);
340 fn_hash_last_dflt
= order
;
346 fib_info_put(res
->fi
);
347 res
->fi
= last_resort
;
349 atomic_inc(&last_resort
->fib_clntref
);
351 fn_hash_last_dflt
= last_idx
;
353 read_unlock(&fib_hash_lock
);
356 /* Insert node F to FZ. */
357 static inline void fib_insert_node(struct fn_zone
*fz
, struct fib_node
*f
)
359 struct hlist_head
*head
= &fz
->fz_hash
[fn_hash(f
->fn_key
, fz
)];
361 hlist_add_head(&f
->fn_hash
, head
);
364 /* Return the node in FZ matching KEY. */
365 static struct fib_node
*fib_find_node(struct fn_zone
*fz
, __be32 key
)
367 struct hlist_head
*head
= &fz
->fz_hash
[fn_hash(key
, fz
)];
368 struct hlist_node
*node
;
371 hlist_for_each_entry(f
, node
, head
, fn_hash
) {
372 if (f
->fn_key
== key
)
379 static int fn_hash_insert(struct fib_table
*tb
, struct fib_config
*cfg
)
381 struct fn_hash
*table
= (struct fn_hash
*) tb
->tb_data
;
382 struct fib_node
*new_f
, *f
;
383 struct fib_alias
*fa
, *new_fa
;
386 u8 tos
= cfg
->fc_tos
;
390 if (cfg
->fc_dst_len
> 32)
393 fz
= table
->fn_zones
[cfg
->fc_dst_len
];
394 if (!fz
&& !(fz
= fn_new_zone(table
, cfg
->fc_dst_len
)))
399 if (cfg
->fc_dst
& ~FZ_MASK(fz
))
401 key
= fz_key(cfg
->fc_dst
, fz
);
404 fi
= fib_create_info(cfg
);
408 if (fz
->fz_nent
> (fz
->fz_divisor
<<1) &&
409 fz
->fz_divisor
< FZ_MAX_DIVISOR
&&
410 (cfg
->fc_dst_len
== 32 ||
411 (1 << cfg
->fc_dst_len
) > fz
->fz_divisor
))
414 f
= fib_find_node(fz
, key
);
419 fa
= fib_find_alias(&f
->fn_alias
, tos
, fi
->fib_priority
);
421 /* Now fa, if non-NULL, points to the first fib alias
422 * with the same keys [prefix,tos,priority], if such key already
423 * exists or to the node before which we will insert new one.
425 * If fa is NULL, we will need to allocate a new one and
426 * insert to the head of f.
428 * If f is NULL, no fib node matched the destination key
429 * and we need to allocate a new one of those as well.
432 if (fa
&& fa
->fa_tos
== tos
&&
433 fa
->fa_info
->fib_priority
== fi
->fib_priority
) {
434 struct fib_alias
*fa_orig
;
437 if (cfg
->fc_nlflags
& NLM_F_EXCL
)
440 if (cfg
->fc_nlflags
& NLM_F_REPLACE
) {
441 struct fib_info
*fi_drop
;
444 if (fi
->fib_treeref
> 1)
447 write_lock_bh(&fib_hash_lock
);
448 fi_drop
= fa
->fa_info
;
450 fa
->fa_type
= cfg
->fc_type
;
451 fa
->fa_scope
= cfg
->fc_scope
;
452 state
= fa
->fa_state
;
453 fa
->fa_state
&= ~FA_S_ACCESSED
;
455 write_unlock_bh(&fib_hash_lock
);
457 fib_release_info(fi_drop
);
458 if (state
& FA_S_ACCESSED
)
460 rtmsg_fib(RTM_NEWROUTE
, key
, fa
, cfg
->fc_dst_len
, tb
->tb_id
,
461 &cfg
->fc_nlinfo
, NLM_F_REPLACE
);
465 /* Error if we find a perfect match which
466 * uses the same scope, type, and nexthop
470 fa
= list_entry(fa
->fa_list
.prev
, struct fib_alias
, fa_list
);
471 list_for_each_entry_continue(fa
, &f
->fn_alias
, fa_list
) {
472 if (fa
->fa_tos
!= tos
)
474 if (fa
->fa_info
->fib_priority
!= fi
->fib_priority
)
476 if (fa
->fa_type
== cfg
->fc_type
&&
477 fa
->fa_scope
== cfg
->fc_scope
&&
481 if (!(cfg
->fc_nlflags
& NLM_F_APPEND
))
486 if (!(cfg
->fc_nlflags
& NLM_F_CREATE
))
490 new_fa
= kmem_cache_alloc(fn_alias_kmem
, GFP_KERNEL
);
496 new_f
= kmem_cache_alloc(fn_hash_kmem
, GFP_KERNEL
);
498 goto out_free_new_fa
;
500 INIT_HLIST_NODE(&new_f
->fn_hash
);
501 INIT_LIST_HEAD(&new_f
->fn_alias
);
506 new_fa
->fa_info
= fi
;
507 new_fa
->fa_tos
= tos
;
508 new_fa
->fa_type
= cfg
->fc_type
;
509 new_fa
->fa_scope
= cfg
->fc_scope
;
510 new_fa
->fa_state
= 0;
513 * Insert new entry to the list.
516 write_lock_bh(&fib_hash_lock
);
518 fib_insert_node(fz
, new_f
);
519 list_add_tail(&new_fa
->fa_list
,
520 (fa
? &fa
->fa_list
: &f
->fn_alias
));
522 write_unlock_bh(&fib_hash_lock
);
528 rtmsg_fib(RTM_NEWROUTE
, key
, new_fa
, cfg
->fc_dst_len
, tb
->tb_id
,
533 kmem_cache_free(fn_alias_kmem
, new_fa
);
535 fib_release_info(fi
);
540 static int fn_hash_delete(struct fib_table
*tb
, struct fib_config
*cfg
)
542 struct fn_hash
*table
= (struct fn_hash
*)tb
->tb_data
;
544 struct fib_alias
*fa
, *fa_to_delete
;
548 if (cfg
->fc_dst_len
> 32)
551 if ((fz
= table
->fn_zones
[cfg
->fc_dst_len
]) == NULL
)
556 if (cfg
->fc_dst
& ~FZ_MASK(fz
))
558 key
= fz_key(cfg
->fc_dst
, fz
);
561 f
= fib_find_node(fz
, key
);
566 fa
= fib_find_alias(&f
->fn_alias
, cfg
->fc_tos
, 0);
571 fa
= list_entry(fa
->fa_list
.prev
, struct fib_alias
, fa_list
);
572 list_for_each_entry_continue(fa
, &f
->fn_alias
, fa_list
) {
573 struct fib_info
*fi
= fa
->fa_info
;
575 if (fa
->fa_tos
!= cfg
->fc_tos
)
578 if ((!cfg
->fc_type
||
579 fa
->fa_type
== cfg
->fc_type
) &&
580 (cfg
->fc_scope
== RT_SCOPE_NOWHERE
||
581 fa
->fa_scope
== cfg
->fc_scope
) &&
582 (!cfg
->fc_protocol
||
583 fi
->fib_protocol
== cfg
->fc_protocol
) &&
584 fib_nh_match(cfg
, fi
) == 0) {
594 rtmsg_fib(RTM_DELROUTE
, key
, fa
, cfg
->fc_dst_len
,
595 tb
->tb_id
, &cfg
->fc_nlinfo
, 0);
598 write_lock_bh(&fib_hash_lock
);
599 list_del(&fa
->fa_list
);
600 if (list_empty(&f
->fn_alias
)) {
601 hlist_del(&f
->fn_hash
);
605 write_unlock_bh(&fib_hash_lock
);
607 if (fa
->fa_state
& FA_S_ACCESSED
)
620 static int fn_flush_list(struct fn_zone
*fz
, int idx
)
622 struct hlist_head
*head
= &fz
->fz_hash
[idx
];
623 struct hlist_node
*node
, *n
;
627 hlist_for_each_entry_safe(f
, node
, n
, head
, fn_hash
) {
628 struct fib_alias
*fa
, *fa_node
;
632 list_for_each_entry_safe(fa
, fa_node
, &f
->fn_alias
, fa_list
) {
633 struct fib_info
*fi
= fa
->fa_info
;
635 if (fi
&& (fi
->fib_flags
&RTNH_F_DEAD
)) {
636 write_lock_bh(&fib_hash_lock
);
637 list_del(&fa
->fa_list
);
638 if (list_empty(&f
->fn_alias
)) {
639 hlist_del(&f
->fn_hash
);
643 write_unlock_bh(&fib_hash_lock
);
657 static int fn_hash_flush(struct fib_table
*tb
)
659 struct fn_hash
*table
= (struct fn_hash
*) tb
->tb_data
;
663 for (fz
= table
->fn_zone_list
; fz
; fz
= fz
->fz_next
) {
666 for (i
= fz
->fz_divisor
- 1; i
>= 0; i
--)
667 found
+= fn_flush_list(fz
, i
);
674 fn_hash_dump_bucket(struct sk_buff
*skb
, struct netlink_callback
*cb
,
675 struct fib_table
*tb
,
677 struct hlist_head
*head
)
679 struct hlist_node
*node
;
685 hlist_for_each_entry(f
, node
, head
, fn_hash
) {
686 struct fib_alias
*fa
;
688 list_for_each_entry(fa
, &f
->fn_alias
, fa_list
) {
692 if (fib_dump_info(skb
, NETLINK_CB(cb
->skb
).pid
,
715 fn_hash_dump_zone(struct sk_buff
*skb
, struct netlink_callback
*cb
,
716 struct fib_table
*tb
,
721 if (fz
->fz_hash
== NULL
)
724 for (h
= s_h
; h
< fz
->fz_divisor
; h
++) {
725 if (hlist_empty(&fz
->fz_hash
[h
]))
727 if (fn_hash_dump_bucket(skb
, cb
, tb
, fz
, &fz
->fz_hash
[h
]) < 0) {
731 memset(&cb
->args
[4], 0,
732 sizeof(cb
->args
) - 4*sizeof(cb
->args
[0]));
738 static int fn_hash_dump(struct fib_table
*tb
, struct sk_buff
*skb
, struct netlink_callback
*cb
)
742 struct fn_hash
*table
= (struct fn_hash
*)tb
->tb_data
;
745 read_lock(&fib_hash_lock
);
746 for (fz
= table
->fn_zone_list
, m
=0; fz
; fz
= fz
->fz_next
, m
++) {
747 if (m
< s_m
) continue;
748 if (fn_hash_dump_zone(skb
, cb
, tb
, fz
) < 0) {
750 read_unlock(&fib_hash_lock
);
753 memset(&cb
->args
[3], 0,
754 sizeof(cb
->args
) - 3*sizeof(cb
->args
[0]));
756 read_unlock(&fib_hash_lock
);
761 #ifdef CONFIG_IP_MULTIPLE_TABLES
762 struct fib_table
* fib_hash_init(u32 id
)
764 struct fib_table
* __init
fib_hash_init(u32 id
)
767 struct fib_table
*tb
;
769 if (fn_hash_kmem
== NULL
)
770 fn_hash_kmem
= kmem_cache_create("ip_fib_hash",
771 sizeof(struct fib_node
),
772 0, SLAB_HWCACHE_ALIGN
,
775 if (fn_alias_kmem
== NULL
)
776 fn_alias_kmem
= kmem_cache_create("ip_fib_alias",
777 sizeof(struct fib_alias
),
778 0, SLAB_HWCACHE_ALIGN
,
781 tb
= kmalloc(sizeof(struct fib_table
) + sizeof(struct fn_hash
),
787 tb
->tb_lookup
= fn_hash_lookup
;
788 tb
->tb_insert
= fn_hash_insert
;
789 tb
->tb_delete
= fn_hash_delete
;
790 tb
->tb_flush
= fn_hash_flush
;
791 tb
->tb_select_default
= fn_hash_select_default
;
792 tb
->tb_dump
= fn_hash_dump
;
793 memset(tb
->tb_data
, 0, sizeof(struct fn_hash
));
797 /* ------------------------------------------------------------------------ */
798 #ifdef CONFIG_PROC_FS
800 struct fib_iter_state
{
801 struct fn_zone
*zone
;
803 struct hlist_head
*hash_head
;
805 struct fib_alias
*fa
;
811 static struct fib_alias
*fib_get_first(struct seq_file
*seq
)
813 struct fib_iter_state
*iter
= seq
->private;
814 struct fib_table
*main_table
= fib_get_table(RT_TABLE_MAIN
);
815 struct fn_hash
*table
= (struct fn_hash
*)main_table
->tb_data
;
818 iter
->hash_head
= NULL
;
822 iter
->genid
= fib_hash_genid
;
825 for (iter
->zone
= table
->fn_zone_list
; iter
->zone
;
826 iter
->zone
= iter
->zone
->fz_next
) {
829 if (!iter
->zone
->fz_nent
)
832 iter
->hash_head
= iter
->zone
->fz_hash
;
833 maxslot
= iter
->zone
->fz_divisor
;
835 for (iter
->bucket
= 0; iter
->bucket
< maxslot
;
836 ++iter
->bucket
, ++iter
->hash_head
) {
837 struct hlist_node
*node
;
840 hlist_for_each_entry(fn
,node
,iter
->hash_head
,fn_hash
) {
841 struct fib_alias
*fa
;
843 list_for_each_entry(fa
,&fn
->fn_alias
,fa_list
) {
855 static struct fib_alias
*fib_get_next(struct seq_file
*seq
)
857 struct fib_iter_state
*iter
= seq
->private;
859 struct fib_alias
*fa
;
861 /* Advance FA, if any. */
866 list_for_each_entry_continue(fa
, &fn
->fn_alias
, fa_list
) {
872 fa
= iter
->fa
= NULL
;
876 struct hlist_node
*node
= &fn
->fn_hash
;
877 hlist_for_each_entry_continue(fn
, node
, fn_hash
) {
880 list_for_each_entry(fa
, &fn
->fn_alias
, fa_list
) {
887 fn
= iter
->fn
= NULL
;
889 /* Advance hash chain. */
894 struct hlist_node
*node
;
897 maxslot
= iter
->zone
->fz_divisor
;
899 while (++iter
->bucket
< maxslot
) {
902 hlist_for_each_entry(fn
, node
, iter
->hash_head
, fn_hash
) {
903 list_for_each_entry(fa
, &fn
->fn_alias
, fa_list
) {
911 iter
->zone
= iter
->zone
->fz_next
;
917 iter
->hash_head
= iter
->zone
->fz_hash
;
919 hlist_for_each_entry(fn
, node
, iter
->hash_head
, fn_hash
) {
920 list_for_each_entry(fa
, &fn
->fn_alias
, fa_list
) {
932 static struct fib_alias
*fib_get_idx(struct seq_file
*seq
, loff_t pos
)
934 struct fib_iter_state
*iter
= seq
->private;
935 struct fib_alias
*fa
;
937 if (iter
->valid
&& pos
>= iter
->pos
&& iter
->genid
== fib_hash_genid
) {
941 fa
= fib_get_first(seq
);
944 while (pos
&& (fa
= fib_get_next(seq
)))
946 return pos
? NULL
: fa
;
949 static void *fib_seq_start(struct seq_file
*seq
, loff_t
*pos
)
953 read_lock(&fib_hash_lock
);
954 if (fib_get_table(RT_TABLE_MAIN
))
955 v
= *pos
? fib_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
959 static void *fib_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
962 return v
== SEQ_START_TOKEN
? fib_get_first(seq
) : fib_get_next(seq
);
965 static void fib_seq_stop(struct seq_file
*seq
, void *v
)
967 read_unlock(&fib_hash_lock
);
970 static unsigned fib_flag_trans(int type
, __be32 mask
, struct fib_info
*fi
)
972 static const unsigned type2flags
[RTN_MAX
+ 1] = {
973 [7] = RTF_REJECT
, [8] = RTF_REJECT
,
975 unsigned flags
= type2flags
[type
];
977 if (fi
&& fi
->fib_nh
->nh_gw
)
978 flags
|= RTF_GATEWAY
;
979 if (mask
== htonl(0xFFFFFFFF))
986 * This outputs /proc/net/route.
988 * It always works in backward compatibility mode.
989 * The format of the file is not supposed to be changed.
991 static int fib_seq_show(struct seq_file
*seq
, void *v
)
993 struct fib_iter_state
*iter
;
998 struct fib_alias
*fa
;
1001 if (v
== SEQ_START_TOKEN
) {
1002 seq_printf(seq
, "%-127s\n", "Iface\tDestination\tGateway "
1003 "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
1008 iter
= seq
->private;
1013 mask
= FZ_MASK(iter
->zone
);
1014 flags
= fib_flag_trans(fa
->fa_type
, mask
, fi
);
1016 snprintf(bf
, sizeof(bf
),
1017 "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
1018 fi
->fib_dev
? fi
->fib_dev
->name
: "*", prefix
,
1019 fi
->fib_nh
->nh_gw
, flags
, 0, 0, fi
->fib_priority
,
1020 mask
, (fi
->fib_advmss
? fi
->fib_advmss
+ 40 : 0),
1024 snprintf(bf
, sizeof(bf
),
1025 "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
1026 prefix
, 0, flags
, 0, 0, 0, mask
, 0, 0, 0);
1027 seq_printf(seq
, "%-127s\n", bf
);
1032 static const struct seq_operations fib_seq_ops
= {
1033 .start
= fib_seq_start
,
1034 .next
= fib_seq_next
,
1035 .stop
= fib_seq_stop
,
1036 .show
= fib_seq_show
,
1039 static int fib_seq_open(struct inode
*inode
, struct file
*file
)
1041 return seq_open_private(file
, &fib_seq_ops
,
1042 sizeof(struct fib_iter_state
));
1045 static const struct file_operations fib_seq_fops
= {
1046 .owner
= THIS_MODULE
,
1047 .open
= fib_seq_open
,
1049 .llseek
= seq_lseek
,
1050 .release
= seq_release_private
,
1053 int __init
fib_proc_init(void)
1055 if (!proc_net_fops_create(&init_net
, "route", S_IRUGO
, &fib_seq_fops
))
1060 void __init
fib_proc_exit(void)
1062 proc_net_remove(&init_net
, "route");
1064 #endif /* CONFIG_PROC_FS */