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Date: Wed, 28 Mar 2012 19:36:37 +0400
From: Pavel Emelyanov <xemul@...allels.com>
To: Linux Netdev List <netdev@...r.kernel.org>,
David Miller <davem@...emloft.net>
Subject: [PATCH 1/3] tcp: Move code around
This is just the preparation patch, which makes the needed for
TCP repair code ready for use.
Signed-off-by: Pavel Emelyanov <xemul@...allels.com>
---
include/net/tcp.h | 3 ++
net/ipv4/tcp.c | 2 +-
net/ipv4/tcp_input.c | 81 +++++++++++++++++++++++++++++--------------------
net/ipv4/tcp_output.c | 4 +-
4 files changed, 54 insertions(+), 36 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index f75a04d..c7a00eb 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -435,6 +435,9 @@ extern struct sk_buff * tcp_make_synack(struct sock *sk, struct dst_entry *dst,
struct request_values *rvp);
extern int tcp_disconnect(struct sock *sk, int flags);
+void tcp_connect_init(struct sock *sk);
+void tcp_finish_connect(struct sock *sk, struct sk_buff *skb);
+void tcp_queue_rcv(struct sock *sk, struct sk_buff *skb, int hdrlen);
/* From syncookies.c */
extern __u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS];
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index cfd7edd..9e7f9ba 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -918,7 +918,7 @@ int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
int iovlen, flags, err, copied;
- int mss_now, size_goal;
+ int mss_now = 0, size_goal;
bool sg;
long timeo;
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e886e2f..3767a1a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5322,6 +5322,14 @@ discard:
return 0;
}
+void tcp_queue_rcv(struct sock *sk, struct sk_buff *skb, int hdrlen)
+{
+ __skb_pull(skb, hdrlen);
+ __skb_queue_tail(&sk->sk_receive_queue, skb);
+ skb_set_owner_r(skb, sk);
+ tcp_sk(sk)->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
+}
+
/*
* TCP receive function for the ESTABLISHED state.
*
@@ -5487,10 +5495,7 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPHPHITS);
/* Bulk data transfer: receiver */
- __skb_pull(skb, tcp_header_len);
- __skb_queue_tail(&sk->sk_receive_queue, skb);
- skb_set_owner_r(skb, sk);
- tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
+ tcp_queue_rcv(sk, skb, tcp_header_len);
}
tcp_event_data_recv(sk, skb);
@@ -5556,6 +5561,44 @@ discard:
}
EXPORT_SYMBOL(tcp_rcv_established);
+void tcp_finish_connect(struct sock *sk, struct sk_buff *skb)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ tcp_set_state(sk, TCP_ESTABLISHED);
+
+ if (skb != NULL)
+ security_inet_conn_established(sk, skb);
+
+ /* Make sure socket is routed, for correct metrics. */
+ icsk->icsk_af_ops->rebuild_header(sk);
+
+ tcp_init_metrics(sk);
+
+ tcp_init_congestion_control(sk);
+
+ /* Prevent spurious tcp_cwnd_restart() on first data
+ * packet.
+ */
+ tp->lsndtime = tcp_time_stamp;
+
+ tcp_init_buffer_space(sk);
+
+ if (sock_flag(sk, SOCK_KEEPOPEN))
+ inet_csk_reset_keepalive_timer(sk, keepalive_time_when(tp));
+
+ if (!tp->rx_opt.snd_wscale)
+ __tcp_fast_path_on(tp, tp->snd_wnd);
+ else
+ tp->pred_flags = 0;
+
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ sk->sk_state_change(sk);
+ sk_wake_async(sk, SOCK_WAKE_IO, POLL_OUT);
+ }
+}
+
static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
const struct tcphdr *th, unsigned int len)
{
@@ -5688,36 +5731,8 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
}
smp_mb();
- tcp_set_state(sk, TCP_ESTABLISHED);
-
- security_inet_conn_established(sk, skb);
-
- /* Make sure socket is routed, for correct metrics. */
- icsk->icsk_af_ops->rebuild_header(sk);
-
- tcp_init_metrics(sk);
- tcp_init_congestion_control(sk);
-
- /* Prevent spurious tcp_cwnd_restart() on first data
- * packet.
- */
- tp->lsndtime = tcp_time_stamp;
-
- tcp_init_buffer_space(sk);
-
- if (sock_flag(sk, SOCK_KEEPOPEN))
- inet_csk_reset_keepalive_timer(sk, keepalive_time_when(tp));
-
- if (!tp->rx_opt.snd_wscale)
- __tcp_fast_path_on(tp, tp->snd_wnd);
- else
- tp->pred_flags = 0;
-
- if (!sock_flag(sk, SOCK_DEAD)) {
- sk->sk_state_change(sk);
- sk_wake_async(sk, SOCK_WAKE_IO, POLL_OUT);
- }
+ tcp_finish_connect(sk, skb);
if (sk->sk_write_pending ||
icsk->icsk_accept_queue.rskq_defer_accept ||
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 364784a..1db25af 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2561,7 +2561,7 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
EXPORT_SYMBOL(tcp_make_synack);
/* Do all connect socket setups that can be done AF independent. */
-static void tcp_connect_init(struct sock *sk)
+void tcp_connect_init(struct sock *sk)
{
const struct dst_entry *dst = __sk_dst_get(sk);
struct tcp_sock *tp = tcp_sk(sk);
@@ -2616,6 +2616,7 @@ static void tcp_connect_init(struct sock *sk)
tp->snd_una = tp->write_seq;
tp->snd_sml = tp->write_seq;
tp->snd_up = tp->write_seq;
+ tp->snd_nxt = tp->write_seq;
tp->rcv_nxt = 0;
tp->rcv_wup = 0;
tp->copied_seq = 0;
@@ -2641,7 +2642,6 @@ int tcp_connect(struct sock *sk)
/* Reserve space for headers. */
skb_reserve(buff, MAX_TCP_HEADER);
- tp->snd_nxt = tp->write_seq;
tcp_init_nondata_skb(buff, tp->write_seq++, TCPHDR_SYN);
TCP_ECN_send_syn(sk, buff);
--
1.5.5.6
--
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