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timewait_sock: Create and use getpeer op.

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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>
This commit is contained in:
David S. Miller
2010-12-01 18:09:13 -08:00
parent 4399ce402c
commit ccb7c410dd
5 changed files with 63 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
net/ipv4/tcp_minisocks.c
View File

@@ -78,6 +78,27 @@ static int tcp_remember_stamp(struct sock *sk)
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 @@ kill_with_rst:
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