ipv4: share tcp_v4_save_options() with cookie_v4_check()
cookie_v4_check() allocates ip_options_rcu in the same way
with tcp_v4_save_options(), we can just make it a helper function.
Cc: Krzysztof Kolasa <kkolasa@winsoft.pl>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 7e7401c..c68d0a1 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -317,15 +317,7 @@
/* We throwed the options of the initial SYN away, so we hope
* the ACK carries the same options again (see RFC1122 4.2.3.8)
*/
- if (opt && opt->optlen) {
- int opt_size = sizeof(struct ip_options_rcu) + opt->optlen;
-
- ireq->opt = kmalloc(opt_size, GFP_ATOMIC);
- if (ireq->opt != NULL && __ip_options_echo(&ireq->opt->opt, skb, opt)) {
- kfree(ireq->opt);
- ireq->opt = NULL;
- }
- }
+ ireq->opt = tcp_v4_save_options(skb);
if (security_inet_conn_request(sk, skb, req)) {
reqsk_free(req);