Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[cascardo/linux.git] / net / ipv4 / fib_hash.c

diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index a15b2f1..8d58d85 100644 (file)
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -372,7 +372,8 @@ static struct fib_node *fib_find_node(struct fn_zone *fz, __be32 key)
 static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
 {
        struct fn_hash *table = (struct fn_hash *) tb->tb_data;
-       struct fib_node *new_f, *f;
+       struct fib_node *new_f = NULL;
+       struct fib_node *f;
        struct fib_alias *fa, *new_fa;
        struct fn_zone *fz;
        struct fib_info *fi;
@@ -424,19 +425,43 @@ 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 +484,11 @@ 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;
@@ -481,7 +497,6 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
 
        err = -ENOBUFS;
 
-       new_f = NULL;
        if (!f) {
                new_f = kmem_cache_zalloc(fn_hash_kmem, GFP_KERNEL);
                if (new_f == NULL)
@@ -497,7 +512,7 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
        if (new_fa->fa_info != NULL) {
                new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL);
                if (new_fa == NULL)
-                       goto out_free_new_f;
+                       goto out;
        }
        new_fa->fa_info = fi;
        new_fa->fa_tos = tos;
@@ -525,9 +540,9 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
                  &cfg->fc_nlinfo, 0);
        return 0;
 
-out_free_new_f:
-       kmem_cache_free(fn_hash_kmem, new_f);
 out:
+       if (new_f)
+               kmem_cache_free(fn_hash_kmem, new_f);
        fib_release_info(fi);
        return err;
 }