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authorDavid S. Miller <davem@davemloft.net>2010-11-29 13:37:14 -0800
committerDavid S. Miller <davem@davemloft.net>2010-11-30 12:28:06 -0800
commit3f419d2d487821093ee46e898b5f8747f9edc9cd (patch)
treea3f7731eb0706c5ae6d0f4ec004ba0d08d7f951b /net/ipv4/tcp_minisocks.c
parentb3419363808f2481b24a817f491878e1795db4c7 (diff)
inet: Turn ->remember_stamp into ->get_peer in connection AF ops.
Then we can make a completely generic tcp_remember_stamp() that uses ->get_peer() as a helper, minimizing the AF specific code and minimizing the eventual code duplication when we implement the ipv6 side of TW recycling. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_minisocks.c')
-rw-r--r--net/ipv4/tcp_minisocks.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 43cf901d7659..059082c873cf 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -49,6 +49,35 @@ struct inet_timewait_death_row tcp_death_row = {
};
EXPORT_SYMBOL_GPL(tcp_death_row);
+/* VJ's idea. Save last timestamp seen from this destination
+ * and hold it at least for normal timewait interval to use for duplicate
+ * segment detection in subsequent connections, before they enter synchronized
+ * state.
+ */
+
+static int tcp_remember_stamp(struct sock *sk)
+{
+ const struct inet_connection_sock *icsk = inet_csk(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct inet_peer *peer;
+ bool release_it;
+
+ peer = icsk->icsk_af_ops->get_peer(sk, &release_it);
+ if (peer) {
+ if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 ||
+ ((u32)get_seconds() - peer->tcp_ts_stamp > TCP_PAWS_MSL &&
+ peer->tcp_ts_stamp <= (u32)tp->rx_opt.ts_recent_stamp)) {
+ peer->tcp_ts_stamp = (u32)tp->rx_opt.ts_recent_stamp;
+ peer->tcp_ts = tp->rx_opt.ts_recent;
+ }
+ if (release_it)
+ inet_putpeer(peer);
+ return 1;
+ }
+
+ return 0;
+}
+
static __inline__ int tcp_in_window(u32 seq, u32 end_seq, u32 s_win, u32 e_win)
{
if (seq == s_win)
@@ -274,7 +303,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
int recycle_ok = 0;
if (tcp_death_row.sysctl_tw_recycle && tp->rx_opt.ts_recent_stamp)
- recycle_ok = icsk->icsk_af_ops->remember_stamp(sk);
+ recycle_ok = tcp_remember_stamp(sk);
if (tcp_death_row.tw_count < tcp_death_row.sysctl_max_tw_buckets)
tw = inet_twsk_alloc(sk, state);