tcp: Move rcvq sending to tcp_input.c

It actually works on the input queue and will use its read mem
routines, thus it's better to have in in the tcp_input.c file.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 34 insertions, 1 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index eb58b94301ec..7c6c99dcc962 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4746,7 +4746,7 @@ end:
 		skb_set_owner_r(skb, sk);
 }
 
-int tcp_queue_rcv(struct sock *sk, struct sk_buff *skb, int hdrlen,
+static int __must_check tcp_queue_rcv(struct sock *sk, struct sk_buff *skb, int hdrlen,
 		  bool *fragstolen)
 {
 	int eaten;
@@ -4763,6 +4763,39 @@ int tcp_queue_rcv(struct sock *sk, struct sk_buff *skb, int hdrlen,
 	return eaten;
 }
 
+int tcp_send_rcvq(struct sock *sk, struct msghdr *msg, size_t size)
+{
+	struct sk_buff *skb;
+	struct tcphdr *th;
+	bool fragstolen;
+
+	skb = alloc_skb(size + sizeof(*th), sk->sk_allocation);
+	if (!skb)
+		goto err;
+
+	th = (struct tcphdr *)skb_put(skb, sizeof(*th));
+	skb_reset_transport_header(skb);
+	memset(th, 0, sizeof(*th));
+
+	if (memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size))
+		goto err_free;
+
+	TCP_SKB_CB(skb)->seq = tcp_sk(sk)->rcv_nxt;
+	TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(skb)->seq + size;
+	TCP_SKB_CB(skb)->ack_seq = tcp_sk(sk)->snd_una - 1;
+
+	if (tcp_queue_rcv(sk, skb, sizeof(*th), &fragstolen)) {
+		WARN_ON_ONCE(fragstolen); /* should not happen */
+		__kfree_skb(skb);
+	}
+	return size;
+
+err_free:
+	kfree_skb(skb);
+err:
+	return -ENOMEM;
+}
+
 static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
 {
 	const struct tcphdr *th = tcp_hdr(skb);