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authorJulian Anastasov <ja@ssi.bg>2008-01-28 21:14:10 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-31 19:27:10 -0800
commitc18865f39276435abb9286f9a816cb5b66c99a00 (patch)
tree2ca2ef60d5dda112a7e69cbaa4b52be11034c159 /net/ipv4
parentec9dbb1c3ee785ddc0c327497df42c16188d1fd8 (diff)
[IPV4] fib: fix route replacement, fib_info is shared
fib_info can be shared by many route prefixes but we don't want duplicate alternative routes for a prefix+tos+priority. Last change was not correct to check fib_treeref because it accounts usage from other prefixes. Additionally, avoid replacement without error if new route is same, as Joonwoo Park suggests. Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/fib_hash.c47
1 files changed, 31 insertions, 16 deletions
diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index a15b2f1b272..76b9c684ccc 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -424,19 +424,43 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
if (fa && fa->fa_tos == tos &&
fa->fa_info->fib_priority == fi->fib_priority) {
- struct fib_alias *fa_orig;
+ struct fib_alias *fa_first, *fa_match;
err = -EEXIST;
if (cfg->fc_nlflags & NLM_F_EXCL)
goto out;
+ /* We have 2 goals:
+ * 1. Find exact match for type, scope, fib_info to avoid
+ * duplicate routes
+ * 2. Find next 'fa' (or head), NLM_F_APPEND inserts before it
+ */
+ fa_match = NULL;
+ fa_first = fa;
+ fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
+ list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
+ if (fa->fa_tos != tos)
+ break;
+ if (fa->fa_info->fib_priority != fi->fib_priority)
+ break;
+ if (fa->fa_type == cfg->fc_type &&
+ fa->fa_scope == cfg->fc_scope &&
+ fa->fa_info == fi) {
+ fa_match = fa;
+ break;
+ }
+ }
+
if (cfg->fc_nlflags & NLM_F_REPLACE) {
struct fib_info *fi_drop;
u8 state;
- if (fi->fib_treeref > 1)
+ fa = fa_first;
+ if (fa_match) {
+ if (fa == fa_match)
+ err = 0;
goto out;
-
+ }
write_lock_bh(&fib_hash_lock);
fi_drop = fa->fa_info;
fa->fa_info = fi;
@@ -459,20 +483,11 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
* uses the same scope, type, and nexthop
* information.
*/
- fa_orig = fa;
- fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list);
- list_for_each_entry_continue(fa, &f->fn_alias, fa_list) {
- if (fa->fa_tos != tos)
- break;
- if (fa->fa_info->fib_priority != fi->fib_priority)
- break;
- if (fa->fa_type == cfg->fc_type &&
- fa->fa_scope == cfg->fc_scope &&
- fa->fa_info == fi)
- goto out;
- }
+ if (fa_match)
+ goto out;
+
if (!(cfg->fc_nlflags & NLM_F_APPEND))
- fa = fa_orig;
+ fa = fa_first;
}
err = -ENOENT;