[ICSK]: Rename struct tcp_func to struct inet_connection_sock_af_ops

And move it to struct inet_connection_sock. DCCP will use it in the
upcoming changesets.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 71 insertions, 98 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 0e1da6602e05..4e1434007f44 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -295,8 +295,6 @@ struct tcp_sock {
 
 	struct sk_buff_head	out_of_order_queue; /* Out of order segments go here */
 
-	struct tcp_func		*af_specific;	/* Operations which are AF_INET{4,6} specific	*/
-
  	__u32	rcv_wnd;	/* Current receiver window		*/
 	__u32	rcv_wup;	/* rcv_nxt on last window update sent	*/
 	__u32	write_seq;	/* Tail(+1) of data held in tcp send buffer */
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index ccc81a1c550c..9e20d201e951 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -15,6 +15,7 @@
 #ifndef _INET_CONNECTION_SOCK_H
 #define _INET_CONNECTION_SOCK_H
 
+#include <linux/compiler.h>
 #include <linux/ip.h>
 #include <linux/string.h>
 #include <linux/timer.h>
@@ -29,6 +30,29 @@ struct inet_bind_bucket;
 struct inet_hashinfo;
 struct tcp_congestion_ops;
 
+/*
+ * Pointers to address related TCP functions
+ * (i.e. things that depend on the address family)
+ */
+struct inet_connection_sock_af_ops {
+	int	    (*queue_xmit)(struct sk_buff *skb, int ipfragok);
+	void	    (*send_check)(struct sock *sk, int len,
+				  struct sk_buff *skb);
+	int	    (*rebuild_header)(struct sock *sk);
+	int	    (*conn_request)(struct sock *sk, struct sk_buff *skb);
+	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);
+	__u16	    net_header_len;
+	int	    (*setsockopt)(struct sock *sk, int level, int optname, 
+				  char __user *optval, int optlen);
+	int	    (*getsockopt)(struct sock *sk, int level, int optname, 
+				  char __user *optval, int __user *optlen);
+	void	    (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
+	int sockaddr_len;
+};
+
 /** inet_connection_sock - INET connection oriented sock
  *
  * @icsk_accept_queue:	   FIFO of established children 
@@ -37,6 +61,7 @@ struct tcp_congestion_ops;
  * @icsk_retransmit_timer: Resend (no ack)
  * @icsk_rto:		   Retransmit timeout
  * @icsk_ca_ops		   Pluggable congestion control hook
+ * @icsk_af_ops		   Operations which are AF_INET{4,6} specific
  * @icsk_ca_state:	   Congestion control state
  * @icsk_retransmits:	   Number of unrecovered [RTO] timeouts
  * @icsk_pending:	   Scheduled timer event
@@ -55,6 +80,7 @@ struct inet_connection_sock {
  	struct timer_list	  icsk_delack_timer;
 	__u32			  icsk_rto;
 	struct tcp_congestion_ops *icsk_ca_ops;
+	struct inet_connection_sock_af_ops *icsk_af_ops;
 	__u8			  icsk_ca_state;
 	__u8			  icsk_retransmits;
 	__u8			  icsk_pending;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index d78025f9fbea..83b117a25c2a 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -225,53 +225,6 @@ extern atomic_t tcp_sockets_allocated;
 extern int tcp_memory_pressure;
 
 /*
- *	Pointers to address related TCP functions
- *	(i.e. things that depend on the address family)
- */
-
-struct tcp_func {
-	int			(*queue_xmit)		(struct sk_buff *skb,
-							 int ipfragok);
-
-	void			(*send_check)		(struct sock *sk,
-							 struct tcphdr *th,
-							 int len,
-							 struct sk_buff *skb);
-
-	int			(*rebuild_header)	(struct sock *sk);
-
-	int			(*conn_request)		(struct sock *sk,
-							 struct sk_buff *skb);
-
-	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);
-
-	__u16			net_header_len;
-
-	int			(*setsockopt)		(struct sock *sk, 
-							 int level, 
-							 int optname, 
-							 char __user *optval, 
-							 int optlen);
-
-	int			(*getsockopt)		(struct sock *sk, 
-							 int level, 
-							 int optname, 
-							 char __user *optval, 
-							 int __user *optlen);
-
-
-	void			(*addr2sockaddr)	(struct sock *sk,
-							 struct sockaddr *);
-
-	int sockaddr_len;
-};
-
-/*
  * The next routines deal with comparing 32 bit unsigned ints
  * and worry about wraparound (automatic with unsigned arithmetic).
  */
@@ -405,8 +358,7 @@ extern void			tcp_parse_options(struct sk_buff *skb,
  *	TCP v4 functions exported for the inet6 API
  */
 
-extern void		       	tcp_v4_send_check(struct sock *sk, 
-						  struct tcphdr *th, int len, 
+extern void		       	tcp_v4_send_check(struct sock *sk, int len,
 						  struct sk_buff *skb);
 
 extern int			tcp_v4_conn_request(struct sock *sk,
diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h
index 4e86f2de6638..61f724c1036f 100644
--- a/include/net/transp_v6.h
+++ b/include/net/transp_v6.h
@@ -44,7 +44,7 @@ extern int			datagram_send_ctl(struct msghdr *msg,
 /*
  *	address family specific functions
  */
-extern struct tcp_func	ipv4_specific;
+extern struct inet_connection_sock_af_ops ipv4_specific;
 
 extern int inet6_destroy_sock(struct sock *sk);
 
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index a34e60ea48a1..e20be3331f67 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -173,10 +173,10 @@ static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
 					   struct request_sock *req,
 					   struct dst_entry *dst)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
+	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct sock *child;
 
-	child = tp->af_specific->syn_recv_sock(sk, skb, req, dst);
+	child = icsk->icsk_af_ops->syn_recv_sock(sk, skb, req, dst);
 	if (child)
 		inet_csk_reqsk_queue_add(sk, req, child);
 	else
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ef98b14ac56d..eacfe6a3442c 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1696,8 +1696,8 @@ int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
 	int err = 0;
 
 	if (level != SOL_TCP)
-		return tp->af_specific->setsockopt(sk, level, optname,
-						   optval, optlen);
+		return icsk->icsk_af_ops->setsockopt(sk, level, optname,
+						     optval, optlen);
 
 	/* This is a string value all the others are int's */
 	if (optname == TCP_CONGESTION) {
@@ -1939,8 +1939,8 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
 	int val, len;
 
 	if (level != SOL_TCP)
-		return tp->af_specific->getsockopt(sk, level, optname,
-						   optval, optlen);
+		return icsk->icsk_af_ops->getsockopt(sk, level, optname,
+						     optval, optlen);
 
 	if (get_user(len, optlen))
 		return -EFAULT;
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index bf2e23086bce..7de6184d4bd8 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4071,8 +4071,10 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 		mb();
 		tcp_set_state(sk, TCP_ESTABLISHED);
 
+		icsk = inet_csk(sk);
+
 		/* Make sure socket is routed, for correct metrics.  */
-		tp->af_specific->rebuild_header(sk);
+		icsk->icsk_af_ops->rebuild_header(sk);
 
 		tcp_init_metrics(sk);
 
@@ -4098,8 +4100,6 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 			sk_wake_async(sk, 0, POLL_OUT);
 		}
 
-		icsk = inet_csk(sk);
-
 		if (sk->sk_write_pending ||
 		    icsk->icsk_accept_queue.rskq_defer_accept ||
 		    icsk->icsk_ack.pingpong) {
@@ -4220,6 +4220,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 			  struct tcphdr *th, unsigned len)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
+	struct inet_connection_sock *icsk = inet_csk(sk);
 	int queued = 0;
 
 	tp->rx_opt.saw_tstamp = 0;
@@ -4236,7 +4237,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 			goto discard;
 
 		if(th->syn) {
-			if(tp->af_specific->conn_request(sk, skb) < 0)
+			if (icsk->icsk_af_ops->conn_request(sk, skb) < 0)
 				return 1;
 
 			/* Now we have several options: In theory there is 
@@ -4349,7 +4350,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 				/* Make sure socket is routed, for
 				 * correct metrics.
 				 */
-				tp->af_specific->rebuild_header(sk);
+				icsk->icsk_af_ops->rebuild_header(sk);
 
 				tcp_init_metrics(sk);
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 2aa19c89a94a..704cf2105795 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -86,8 +86,7 @@ int sysctl_tcp_low_latency;
 /* Socket used for sending RSTs */
 static struct socket *tcp_socket;
 
-void tcp_v4_send_check(struct sock *sk, struct tcphdr *th, int len,
-		       struct sk_buff *skb);
+void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
 
 struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
 	.lhash_lock	= RW_LOCK_UNLOCKED,
@@ -645,10 +644,10 @@ out:
 }
 
 /* This routine computes an IPv4 TCP checksum. */
-void tcp_v4_send_check(struct sock *sk, struct tcphdr *th, int len,
-		       struct sk_buff *skb)
+void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
 {
 	struct inet_sock *inet = inet_sk(sk);
+	struct tcphdr *th = skb->h.th;
 
 	if (skb->ip_summed == CHECKSUM_HW) {
 		th->check = ~tcp_v4_check(th, len, inet->saddr, inet->daddr, 0);
@@ -1383,7 +1382,7 @@ int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw)
 	return 0;
 }
 
-struct tcp_func ipv4_specific = {
+struct inet_connection_sock_af_ops ipv4_specific = {
 	.queue_xmit	=	ip_queue_xmit,
 	.send_check	=	tcp_v4_send_check,
 	.rebuild_header	=	inet_sk_rebuild_header,
@@ -1434,7 +1433,7 @@ static int tcp_v4_init_sock(struct sock *sk)
 	sk->sk_write_space = sk_stream_write_space;
 	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
 
-	tp->af_specific = &ipv4_specific;
+	icsk->icsk_af_ops = &ipv4_specific;
 
 	sk->sk_sndbuf = sysctl_tcp_wmem[1];
 	sk->sk_rcvbuf = sysctl_tcp_rmem[1];
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 1b66a2ac4321..9c029683a626 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -274,18 +274,18 @@ kill:
 void tcp_time_wait(struct sock *sk, int state, int timeo)
 {
 	struct inet_timewait_sock *tw = NULL;
+	const struct inet_connection_sock *icsk = inet_csk(sk);
 	const struct tcp_sock *tp = tcp_sk(sk);
 	int recycle_ok = 0;
 
 	if (tcp_death_row.sysctl_tw_recycle && tp->rx_opt.ts_recent_stamp)
-		recycle_ok = tp->af_specific->remember_stamp(sk);
+		recycle_ok = icsk->icsk_af_ops->remember_stamp(sk);
 
 	if (tcp_death_row.tw_count < tcp_death_row.sysctl_max_tw_buckets)
 		tw = inet_twsk_alloc(sk, state);
 
 	if (tw != NULL) {
 		struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
-		const struct inet_connection_sock *icsk = inet_csk(sk);
 		const int rto = (icsk->icsk_rto << 2) - (icsk->icsk_rto >> 1);
 
 		tw->tw_rcv_wscale	= tp->rx_opt.rcv_wscale;
@@ -456,7 +456,6 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 			   struct request_sock **prev)
 {
 	struct tcphdr *th = skb->h.th;
-	struct tcp_sock *tp = tcp_sk(sk);
 	u32 flg = tcp_flag_word(th) & (TCP_FLAG_RST|TCP_FLAG_SYN|TCP_FLAG_ACK);
 	int paws_reject = 0;
 	struct tcp_options_received tmp_opt;
@@ -613,7 +612,8 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 		 * ESTABLISHED STATE. If it will be dropped after
 		 * socket is created, wait for troubles.
 		 */
-		child = tp->af_specific->syn_recv_sock(sk, skb, req, NULL);
+		child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb,
+								 req, NULL);
 		if (child == NULL)
 			goto listen_overflow;
 
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index b7325e0b406a..af1946c52c37 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -371,7 +371,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 		TCP_ECN_send(sk, tp, skb, tcp_header_size);
 	}
 
-	tp->af_specific->send_check(sk, th, skb->len, skb);
+	icsk->icsk_af_ops->send_check(sk, skb->len, skb);
 
 	if (likely(tcb->flags & TCPCB_FLAG_ACK))
 		tcp_event_ack_sent(sk, tcp_skb_pcount(skb));
@@ -381,7 +381,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 
 	TCP_INC_STATS(TCP_MIB_OUTSEGS);
 
-	err = tp->af_specific->queue_xmit(skb, 0);
+	err = icsk->icsk_af_ops->queue_xmit(skb, 0);
 	if (unlikely(err <= 0))
 		return err;
 
@@ -638,12 +638,11 @@ int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
 unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
-	int mss_now;
-
 	/* Calculate base mss without TCP options:
 	   It is MMS_S - sizeof(tcphdr) of rfc1122
 	 */
-	mss_now = pmtu - tp->af_specific->net_header_len - sizeof(struct tcphdr);
+	int mss_now = (pmtu - inet_csk(sk)->icsk_af_ops->net_header_len -
+		       sizeof(struct tcphdr));
 
 	/* Clamp it (mss_clamp does not include tcp options) */
 	if (mss_now > tp->rx_opt.mss_clamp)
@@ -705,9 +704,9 @@ unsigned int tcp_current_mss(struct sock *sk, int large_allowed)
 	xmit_size_goal = mss_now;
 
 	if (doing_tso) {
-		xmit_size_goal = 65535 -
-			tp->af_specific->net_header_len -
-			tp->ext_header_len - tp->tcp_header_len;
+		xmit_size_goal = (65535 -
+				  inet_csk(sk)->icsk_af_ops->net_header_len -
+				  tp->ext_header_len - tp->tcp_header_len);
 
 		if (tp->max_window &&
 		    (xmit_size_goal > (tp->max_window >> 1)))
@@ -1422,7 +1421,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
 	   (sysctl_tcp_retrans_collapse != 0))
 		tcp_retrans_try_collapse(sk, skb, cur_mss);
 
-	if(tp->af_specific->rebuild_header(sk))
+	if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk))
 		return -EHOSTUNREACH; /* Routing failure or similar. */
 
 	/* Some Solaris stacks overoptimize and ignore the FIN on a
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 3620718defe6..b6b63fa8454c 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -170,7 +170,7 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname,
 				sock_prot_inc_use(&tcp_prot);
 				local_bh_enable();
 				sk->sk_prot = &tcp_prot;
-				tp->af_specific = &ipv4_specific;
+				inet_csk(sk)->icsk_af_ops = &ipv4_specific;
 				sk->sk_socket->ops = &inet_stream_ops;
 				sk->sk_family = PF_INET;
 				tcp_sync_mss(sk, tp->pmtu_cookie);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index c2472d771664..8ce8a1359d2b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -68,14 +68,14 @@
 
 static void	tcp_v6_send_reset(struct sk_buff *skb);
 static void	tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
-static void	tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, 
+static void	tcp_v6_send_check(struct sock *sk, int len, 
 				  struct sk_buff *skb);
 
 static int	tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
 static int	tcp_v6_xmit(struct sk_buff *skb, int ipfragok);
 
-static struct tcp_func ipv6_mapped;
-static struct tcp_func ipv6_specific;
+static struct inet_connection_sock_af_ops ipv6_mapped;
+static struct inet_connection_sock_af_ops ipv6_specific;
 
 int inet6_csk_bind_conflict(const struct sock *sk,
 			    const struct inet_bind_bucket *tb)
@@ -107,9 +107,7 @@ static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
 static void tcp_v6_hash(struct sock *sk)
 {
 	if (sk->sk_state != TCP_CLOSE) {
-		struct tcp_sock *tp = tcp_sk(sk);
-
-		if (tp->af_specific == &ipv6_mapped) {
+		if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
 			tcp_prot.hash(sk);
 			return;
 		}
@@ -417,14 +415,14 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 		sin.sin_port = usin->sin6_port;
 		sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 
-		tp->af_specific = &ipv6_mapped;
+		inet_csk(sk)->icsk_af_ops = &ipv6_mapped;
 		sk->sk_backlog_rcv = tcp_v4_do_rcv;
 
 		err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 
 		if (err) {
 			tp->ext_header_len = exthdrlen;
-			tp->af_specific = &ipv6_specific;
+			inet_csk(sk)->icsk_af_ops = &ipv6_specific;
 			sk->sk_backlog_rcv = tcp_v6_do_rcv;
 			goto failure;
 		} else {
@@ -751,10 +749,10 @@ static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 }
 
 
-static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, 
-			      struct sk_buff *skb)
+static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct tcphdr *th = skb->h.th;
 
 	if (skb->ip_summed == CHECKSUM_HW) {
 		th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,  0);
@@ -1070,7 +1068,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 
 		ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 
-		newtp->af_specific = &ipv6_mapped;
+		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
 		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
 		newnp->pktoptions  = NULL;
 		newnp->opt	   = NULL;
@@ -1084,7 +1082,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 		 */
 
 		/* It is tricky place. Until this moment IPv4 tcp
-		   worked with IPv6 af_tcp.af_specific.
+		   worked with IPv6 icsk.icsk_af_ops.
 		   Sync it now.
 		 */
 		tcp_sync_mss(newsk, newtp->pmtu_cookie);
@@ -1631,7 +1629,7 @@ static int tcp_v6_remember_stamp(struct sock *sk)
 	return 0;
 }
 
-static struct tcp_func ipv6_specific = {
+static struct inet_connection_sock_af_ops ipv6_specific = {
 	.queue_xmit	=	tcp_v6_xmit,
 	.send_check	=	tcp_v6_send_check,
 	.rebuild_header	=	tcp_v6_rebuild_header,
@@ -1650,7 +1648,7 @@ static struct tcp_func ipv6_specific = {
  *	TCP over IPv4 via INET6 API
  */
 
-static struct tcp_func ipv6_mapped = {
+static struct inet_connection_sock_af_ops ipv6_mapped = {
 	.queue_xmit	=	ip_queue_xmit,
 	.send_check	=	tcp_v4_send_check,
 	.rebuild_header	=	inet_sk_rebuild_header,
@@ -1700,7 +1698,7 @@ static int tcp_v6_init_sock(struct sock *sk)
 
 	sk->sk_state = TCP_CLOSE;
 
-	tp->af_specific = &ipv6_specific;
+	icsk->icsk_af_ops = &ipv6_specific;
 	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
 	sk->sk_write_space = sk_stream_write_space;
 	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);