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Diffstat (limited to 'net/ipv6/ip6_output.c')
-rw-r--r--net/ipv6/ip6_output.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index e6eaa4dd9f60..66a768b7b8fb 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1105,23 +1105,32 @@ EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
* @sk: socket which provides the dst cache and route info
* @fl6: flow to lookup
* @final_dst: final destination address for ipsec lookup
+ * @connected: whether @sk is connected or not
*
* This function performs a route lookup on the given flow with the
* possibility of using the cached route in the socket if it is valid.
* It will take the socket dst lock when operating on the dst cache.
* As a result, this function can only be used in process context.
*
+ * In addition, for a connected socket, cache the dst in the socket
+ * if the current cache is not valid.
+ *
* It returns a valid dst pointer on success, or a pointer encoded
* error code.
*/
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
- const struct in6_addr *final_dst)
+ const struct in6_addr *final_dst,
+ bool connected)
{
struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
dst = ip6_sk_dst_check(sk, dst, fl6);
- if (!dst)
- dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
+ if (dst)
+ return dst;
+
+ dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
+ if (connected && !IS_ERR(dst))
+ ip6_sk_dst_store_flow(sk, dst_clone(dst), fl6);
return dst;
}