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inet: Turn ->remember_stamp into ->get_peer in connection AF ops.

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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>
This commit is contained in:
David S. Miller
2010-11-29 13:37:14 -08:00
parent b341936380
commit 3f419d2d48
5 changed files with 44 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
net/ipv4/tcp_minisocks.c
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@@ -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);