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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/inet_connection_sock.h
View File

@ -43,7 +43,7 @@ struct inet_connection_sock_af_ops {
struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb,
struct request_sock *req,
struct dst_entry *dst);
int (*remember_stamp)(struct sock *sk);
struct inet_peer *(*get_peer)(struct sock *sk, bool *release_it);
u16 net_header_len;
u16 sockaddr_len;
int (*setsockopt)(struct sock *sk, int level, int optname,

2
include/net/tcp.h
View File

@ -312,7 +312,7 @@ extern void tcp_shutdown (struct sock *sk, int how);
extern int tcp_v4_rcv(struct sk_buff *skb);
extern int tcp_v4_remember_stamp(struct sock *sk);
extern struct inet_peer *tcp_v4_get_peer(struct sock *sk, bool *release_it);
extern int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw);
extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
size_t size);

35
net/ipv4/tcp_ipv4.c
View File

@ -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,

31
net/ipv4/tcp_minisocks.c
View File

@ -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);

8
net/ipv6/tcp_ipv6.c
View File

@ -1818,10 +1818,10 @@ do_time_wait:
goto discard_it;
}
static int tcp_v6_remember_stamp(struct sock *sk)
struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
{
/* Alas, not yet... */
return 0;
return NULL;
}
static const struct inet_connection_sock_af_ops ipv6_specific = {
@ -1830,7 +1830,7 @@ static const struct inet_connection_sock_af_ops ipv6_specific = {
.rebuild_header = inet6_sk_rebuild_header,
.conn_request = tcp_v6_conn_request,
.syn_recv_sock = tcp_v6_syn_recv_sock,
.remember_stamp = tcp_v6_remember_stamp,
.get_peer = tcp_v6_get_peer,
.net_header_len = sizeof(struct ipv6hdr),
.setsockopt = ipv6_setsockopt,
.getsockopt = ipv6_getsockopt,
@ -1862,7 +1862,7 @@ static const struct inet_connection_sock_af_ops ipv6_mapped = {
.rebuild_header = inet_sk_rebuild_header,
.conn_request = tcp_v6_conn_request,
.syn_recv_sock = tcp_v6_syn_recv_sock,
.remember_stamp = tcp_v4_remember_stamp,
.get_peer = tcp_v4_get_peer,
.net_header_len = sizeof(struct iphdr),
.setsockopt = ipv6_setsockopt,
.getsockopt = ipv6_getsockopt,