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ipv4: fib_select_default should match the prefix

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fib_trie starting from 4.1 can link fib aliases from
different prefixes in same list. Make sure the alternative
gateways are in same table and for same prefix (0) by
checking tb_id and fa_slen.

Fixes: 79e5ad2ceb ("fib_trie: Remove leaf_info")
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Anastasov 2015-07-22 10:43:22 +03:00 • committed by David S. Miller
parent c5dfd654d0
commit 18a912e9a8
1 changed files with 5 additions and 0 deletions
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5
net/ipv4/fib_semantics.c
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@ -1207,12 +1207,17 @@ void fib_select_default(struct fib_result *res)
struct fib_info *fi = NULL, *last_resort = NULL;
struct hlist_head *fa_head = res->fa_head;
struct fib_table *tb = res->table;
u8 slen = 32 - res->prefixlen;
int order = -1, last_idx = -1;
struct fib_alias *fa;
hlist_for_each_entry_rcu(fa, fa_head, fa_list) {
struct fib_info *next_fi = fa->fa_info;
if (fa->fa_slen != slen)
continue;
if (fa->tb_id != tb->tb_id)
continue;
if (next_fi->fib_scope != res->scope ||
fa->fa_type != RTN_UNICAST)
continue;