-/* 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 bool 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 true;
- }
-
- return false;
-}
-
-static bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw)
-{
- struct sock *sk = (struct sock *) tw;
- struct inet_peer *peer;
-
- peer = twsk_getpeer(sk);
- if (peer) {
- const struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
-
- if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 ||
- ((u32)get_seconds() - peer->tcp_ts_stamp > TCP_PAWS_MSL &&
- peer->tcp_ts_stamp <= (u32)tcptw->tw_ts_recent_stamp)) {
- peer->tcp_ts_stamp = (u32)tcptw->tw_ts_recent_stamp;
- peer->tcp_ts = tcptw->tw_ts_recent;
- }
- inet_putpeer(peer);
- return true;
- }
- return false;
-}
-