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authorOctavian Purdila <opurdila@ixiacom.com>2010-01-18 06:09:39 +0300
committerDavid S. Miller <davem@davemloft.net>2010-01-18 06:09:39 +0300
commit72659ecce68588b74f6c46862c2b4cec137d7a5a (patch)
tree791c5900e2a2b219774904cef7fab90fa462b81c
parent0ec00f0392b807d57a2281576a96552d7694b6bb (diff)
downloadlinux-72659ecce68588b74f6c46862c2b4cec137d7a5a.tar.xz
tcp: account SYN-ACK timeouts & retransmissions
Currently we don't increment SYN-ACK timeouts & retransmissions although we do increment the same stats for SYN. We seem to have lost the SYN-ACK accounting with the introduction of tcp_syn_recv_timer (commit 2248761e in the netdev-vger-cvs tree). This patch fixes this issue. In the process we also rename the v4/v6 syn/ack retransmit functions for clarity. We also add a new request_socket operations (syn_ack_timeout) so we can keep code in inet_connection_sock.c protocol agnostic. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/request_sock.h2
-rw-r--r--include/net/tcp.h2
-rw-r--r--net/ipv4/inet_connection_sock.c2
-rw-r--r--net/ipv4/tcp_ipv4.c18
-rw-r--r--net/ipv4/tcp_timer.c6
-rw-r--r--net/ipv6/tcp_ipv6.c12
6 files changed, 32 insertions, 10 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index c9b50ebd9ce9..99e6e19b57c2 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -45,6 +45,8 @@ struct request_sock_ops {
void (*send_reset)(struct sock *sk,
struct sk_buff *skb);
void (*destructor)(struct request_sock *req);
+ void (*syn_ack_timeout)(struct sock *sk,
+ struct request_sock *req);
};
/* struct request_sock - mini sock to represent a connection request
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 788c99f98597..87d164b9bd8f 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -400,6 +400,8 @@ extern int compat_tcp_setsockopt(struct sock *sk,
int level, int optname,
char __user *optval, unsigned int optlen);
extern void tcp_set_keepalive(struct sock *sk, int val);
+extern void tcp_syn_ack_timeout(struct sock *sk,
+ struct request_sock *req);
extern int tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg,
size_t len, int nonblock,
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index ee16475f8fc3..8da6429269dd 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -529,6 +529,8 @@ void inet_csk_reqsk_queue_prune(struct sock *parent,
syn_ack_recalc(req, thresh, max_retries,
queue->rskq_defer_accept,
&expire, &resend);
+ if (req->rsk_ops->syn_ack_timeout)
+ req->rsk_ops->syn_ack_timeout(parent, req);
if (!expire &&
(!resend ||
!req->rsk_ops->rtx_syn_ack(parent, req, NULL) ||
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 382f667238ec..356f544c4c10 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -742,9 +742,9 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
* This still operates on a request_sock only, not on a big
* socket.
*/
-static int __tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
- struct request_sock *req,
- struct request_values *rvp)
+static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
+ struct request_sock *req,
+ struct request_values *rvp)
{
const struct inet_request_sock *ireq = inet_rsk(req);
int err = -1;
@@ -775,10 +775,11 @@ static int __tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
return err;
}
-static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
+static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req,
struct request_values *rvp)
{
- return __tcp_v4_send_synack(sk, NULL, req, rvp);
+ TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
+ return tcp_v4_send_synack(sk, NULL, req, rvp);
}
/*
@@ -1192,10 +1193,11 @@ static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
struct request_sock_ops tcp_request_sock_ops __read_mostly = {
.family = PF_INET,
.obj_size = sizeof(struct tcp_request_sock),
- .rtx_syn_ack = tcp_v4_send_synack,
+ .rtx_syn_ack = tcp_v4_rtx_synack,
.send_ack = tcp_v4_reqsk_send_ack,
.destructor = tcp_v4_reqsk_destructor,
.send_reset = tcp_v4_send_reset,
+ .syn_ack_timeout = tcp_syn_ack_timeout,
};
#ifdef CONFIG_TCP_MD5SIG
@@ -1373,8 +1375,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
}
tcp_rsk(req)->snt_isn = isn;
- if (__tcp_v4_send_synack(sk, dst, req,
- (struct request_values *)&tmp_ext) ||
+ if (tcp_v4_send_synack(sk, dst, req,
+ (struct request_values *)&tmp_ext) ||
want_cookie)
goto drop_and_free;
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 8816a20c2597..de7d1bf9114f 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -474,6 +474,12 @@ static void tcp_synack_timer(struct sock *sk)
TCP_TIMEOUT_INIT, TCP_RTO_MAX);
}
+void tcp_syn_ack_timeout(struct sock *sk, struct request_sock *req)
+{
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPTIMEOUTS);
+}
+EXPORT_SYMBOL(tcp_syn_ack_timeout);
+
void tcp_set_keepalive(struct sock *sk, int val)
{
if ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 1c832bf198b3..82f2dea0e39e 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -520,6 +520,13 @@ done:
return err;
}
+static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req,
+ struct request_values *rvp)
+{
+ TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
+ return tcp_v6_send_synack(sk, req, rvp);
+}
+
static inline void syn_flood_warning(struct sk_buff *skb)
{
#ifdef CONFIG_SYN_COOKIES
@@ -890,10 +897,11 @@ static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
.family = AF_INET6,
.obj_size = sizeof(struct tcp6_request_sock),
- .rtx_syn_ack = tcp_v6_send_synack,
+ .rtx_syn_ack = tcp_v6_rtx_synack,
.send_ack = tcp_v6_reqsk_send_ack,
.destructor = tcp_v6_reqsk_destructor,
- .send_reset = tcp_v6_send_reset
+ .send_reset = tcp_v6_send_reset,
+ .syn_ack_timeout = tcp_syn_ack_timeout,
};
#ifdef CONFIG_TCP_MD5SIG