[SCTP]: Do not timestamp every SCTP packet.

We only need the timestamp on COOKIE-ECHO chunks, so instead of always
timestamping every SCTP packet, let common code timestamp if the socket
option is set.  For COOKIE-ECHO, simply get the time of day if we don't
have a timestamp.  This introduces a small possibility that the cookie
may be considered expired, but it will be renegotiated.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/input.c b/net/sctp/input.c
index 4714882..64f6301 100644 (file)
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -218,12 +218,6 @@ int sctp_rcv(struct sk_buff *skb)
                }
        }
 
-       /* SCTP seems to always need a timestamp right now (FIXME) */
-       if (skb->tstamp.off_sec == 0) {
-               __net_timestamp(skb);
-               sock_enable_timestamp(sk); 
-       }
-
        if (!xfrm_policy_check(sk, XFRM_POLICY_IN, skb, family))
                goto discard_release;
        nf_reset(skb);

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 7745bde..507dff7 100644 (file)
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1447,8 +1447,16 @@ no_hmac:
        /* Check to see if the cookie is stale.  If there is already
         * an association, there is no need to check cookie's expiration
         * for init collision case of lost COOKIE ACK.
+        * If skb has been timestamped, then use the stamp, otherwise
+        * use current time.  This introduces a small possibility that
+        * that a cookie may be considered expired, but his would only slow
+        * down the new association establishment instead of every packet.
         */
-       skb_get_timestamp(skb, &tv);
+       if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
+               skb_get_timestamp(skb, &tv);
+       else
+               do_gettimeofday(&tv);
+
        if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
                __u16 len;
                /*