commit f52a4f4ea2c5ea3dc17561d32d839a3051e47b0c
Author: Julian Anastasov <[EMAIL PROTECTED]>
Date: Fri Feb 15 01:38:53 2008 -0800
IPV4: fib: fix route replacement, fib_info is shared
Upstream commit: c18865f39276435abb9286f9a816cb5b66c99a00
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 <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index 0dfee27..2f78e1e 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -434,19 +434,43 @@ 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;
@@ -469,20 +493,11 @@ 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;
_______________________________________________
unionfs-cvs mailing list: http://unionfs.filesystems.org/
[email protected]
http://www.fsl.cs.sunysb.edu/mailman/listinfo/unionfs-cvs
