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Commit 370816ae authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by David S. Miller
Browse files

tcp: Move code around 



This is just the preparation patch, which makes the needed for
TCP repair code ready for use.

Signed-off-by: default avatarPavel Emelyanov <xemul@parallels.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4a17fd52

include/net/tcp.h

+3 −0
Original line number Diff line number Diff line
@@ -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];

net/ipv4/tcp.c

+1 −1
Original line number Diff line number Diff line
@@ -919,7 +919,7 @@ 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;

net/ipv4/tcp_input.c

+48 −33
Original line number Diff line number Diff line
@@ -5325,6 +5325,14 @@ 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.

 *
@@ -5490,10 +5498,7 @@ 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);
@@ -5559,6 +5564,44 @@ 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)

{
@@ -5691,36 +5734,8 @@ 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 ||

net/ipv4/tcp_output.c

+2 −2
Original line number Diff line number Diff line
@@ -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);