timewait_sock: Create and use getpeer op.
The only thing AF-specific about remembering the timestamp
for a time-wait TCP socket is getting the peer.
Abstract that behind a new timewait_sock_ops vector.
Support for real IPV6 sockets is not filled in yet, but
curiously this makes timewait recycling start to work
for v4-mapped ipv6 sockets.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 059082c..3527b51 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -78,6 +78,27 @@
return 0;
}
+static int 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 1;
+ }
+ return 0;
+}
+
static __inline__ int tcp_in_window(u32 seq, u32 end_seq, u32 s_win, u32 e_win)
{
if (seq == s_win)
@@ -178,14 +199,9 @@
tcptw->tw_ts_recent = tmp_opt.rcv_tsval;
}
- /* I am shamed, but failed to make it more elegant.
- * Yes, it is direct reference to IP, which is impossible
- * to generalize to IPv6. Taking into account that IPv6
- * do not understand recycling in any case, it not
- * a big problem in practice. --ANK */
- if (tw->tw_family == AF_INET &&
- tcp_death_row.sysctl_tw_recycle && tcptw->tw_ts_recent_stamp &&
- tcp_v4_tw_remember_stamp(tw))
+ if (tcp_death_row.sysctl_tw_recycle &&
+ tcptw->tw_ts_recent_stamp &&
+ tcp_tw_remember_stamp(tw))
inet_twsk_schedule(tw, &tcp_death_row, tw->tw_timeout,
TCP_TIMEWAIT_LEN);
else