[TCP]: Restore SKB socket owner setting in tcp_transmit_skb().

Revert 9317311

We can't elide the skb_set_owner_w() here because things like certain
netfilter targets (such as owner MATCH) need a socket to be set on the
SKB for correct operation.

Thanks to Jan Engelhardt and other netfilter list members for
pointing this out.

Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet6_connection_sock.h

@@ -38,5 +38,5 @@ extern void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 
 extern void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
 
-extern int inet6_csk_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok);
+extern int inet6_csk_xmit(struct sk_buff *skb, int ipfragok);
 #endif /* _INET6_CONNECTION_SOCK_H */

include/net/inet_connection_sock.h

@@ -37,8 +37,7 @@ struct tcp_congestion_ops;
  * (i.e. things that depend on the address family)
  */
 struct inet_connection_sock_af_ops {
-	int	    (*queue_xmit)(struct sk_buff *skb, struct sock *sk,
-				  int ipfragok);
+	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);

include/net/ip.h

@@ -97,7 +97,7 @@ extern int		ip_mc_output(struct sk_buff *skb);
 extern int		ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 extern int		ip_do_nat(struct sk_buff *skb);
 extern void		ip_send_check(struct iphdr *ip);
-extern int		ip_queue_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok);
+extern int		ip_queue_xmit(struct sk_buff *skb, int ipfragok);
 extern void		ip_init(void);
 extern int		ip_append_data(struct sock *sk,
 				       int getfrag(void *from, char *to, int offset, int len,

net/dccp/output.c

@@ -124,7 +124,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 		DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 
 		memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-		err = icsk->icsk_af_ops->queue_xmit(skb, sk, 0);
+		err = icsk->icsk_af_ops->queue_xmit(skb, 0);
 		return net_xmit_eval(err);
 	}
 	return -ENOBUFS;
@@ -396,7 +396,7 @@ int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
 						      code);
 		if (skb != NULL) {
 			memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-			err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, sk, 0);
+			err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
 			return net_xmit_eval(err);
 		}
 	}

net/ipv4/ip_output.c

@@ -281,8 +281,9 @@ int ip_output(struct sk_buff *skb)
 			    !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
 
-int ip_queue_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok)
+int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
 {
+	struct sock *sk = skb->sk;
 	struct inet_sock *inet = inet_sk(sk);
 	struct ip_options *opt = inet->opt;
 	struct rtable *rt;

net/ipv4/tcp_output.c

@@ -467,6 +467,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 
 	th = (struct tcphdr *) skb_push(skb, tcp_header_size);
 	skb->h.th = th;
+	skb_set_owner_w(skb, sk);
 
 	/* Build TCP header and checksum it. */
 	th->source		= inet->sport;
@@ -540,7 +541,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 	if (after(tcb->end_seq, tp->snd_nxt) || tcb->seq == tcb->end_seq)
 		TCP_INC_STATS(TCP_MIB_OUTSEGS);
 
-	err = icsk->icsk_af_ops->queue_xmit(skb, sk, 0);
+	err = icsk->icsk_af_ops->queue_xmit(skb, 0);
 	if (likely(err <= 0))
 		return err;
 

net/ipv6/inet6_connection_sock.c

@@ -139,8 +139,9 @@ void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
 
 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 
-int inet6_csk_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok)
+int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
 {
+	struct sock *sk = skb->sk;
 	struct inet_sock *inet = inet_sk(sk);
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct flowi fl;

net/sctp/protocol.c

@@ -804,7 +804,7 @@ static inline int sctp_v4_xmit(struct sk_buff *skb,
 			  NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
 
 	SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
-	return ip_queue_xmit(skb, skb->sk, ipfragok);
+	return ip_queue_xmit(skb, ipfragok);
 }
 
 static struct sctp_af sctp_ipv4_specific;