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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
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35
net/ipv4/tcp_ipv4.c
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@@ -1763,44 +1763,25 @@ do_time_wait:
goto discard_it;
}
/* 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.
*/
int tcp_v4_remember_stamp(struct sock *sk)
struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it)
{
struct rtable *rt = (struct rtable *) __sk_dst_get(sk);
struct inet_sock *inet = inet_sk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct rtable *rt = (struct rtable *)__sk_dst_get(sk);
struct inet_peer *peer = NULL;
int release_it = 0;
struct inet_peer *peer;
if (!rt || rt->rt_dst != inet->inet_daddr) {
peer = inet_getpeer_v4(inet->inet_daddr, 1);
release_it = 1;
*release_it = true;
} else {
if (!rt->peer)
rt_bind_peer(rt, 1);
peer = rt->peer;
*release_it = false;
}
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;
return peer;
}
EXPORT_SYMBOL(tcp_v4_remember_stamp);
EXPORT_SYMBOL(tcp_v4_get_peer);
int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw)
{
@@ -1828,7 +1809,7 @@ const struct inet_connection_sock_af_ops ipv4_specific = {
.rebuild_header = inet_sk_rebuild_header,
.conn_request = tcp_v4_conn_request,
.syn_recv_sock = tcp_v4_syn_recv_sock,
.remember_stamp = tcp_v4_remember_stamp,
.get_peer = tcp_v4_get_peer,
.net_header_len = sizeof(struct iphdr),
.setsockopt = ip_setsockopt,
.getsockopt = ip_getsockopt,