1 files changed, 10 insertions, 54 deletions

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 12c6ece67f3..cdbf292ad20 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1353,7 +1353,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 	newnp->pktoptions = NULL;
 	if (treq->pktopts != NULL) {
 		newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
-		kfree_skb(treq->pktopts);
+		consume_skb(treq->pktopts);
 		treq->pktopts = NULL;
 		if (newnp->pktoptions)
 			skb_set_owner_r(newnp->pktoptions, newsk);
@@ -1383,6 +1383,10 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 	tcp_mtup_init(newsk);
 	tcp_sync_mss(newsk, dst_mtu(dst));
 	newtp->advmss = dst_metric_advmss(dst);
+	if (tcp_sk(sk)->rx_opt.user_mss &&
+	    tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
+		newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
+
 	tcp_initialize_rcv_mss(newsk);
 	if (tcp_rsk(req)->snt_synack)
 		tcp_valid_rtt_meas(newsk,
@@ -1645,7 +1649,7 @@ process:
 #ifdef CONFIG_NET_DMA
 		struct tcp_sock *tp = tcp_sk(sk);
 		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
-			tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
+			tp->ucopy.dma_chan = net_dma_find_channel();
 		if (tp->ucopy.dma_chan)
 			ret = tcp_v6_do_rcv(sk, skb);
 		else
@@ -1654,7 +1658,8 @@ process:
 			if (!tcp_prequeue(sk, skb))
 				ret = tcp_v6_do_rcv(sk, skb);
 		}
-	} else if (unlikely(sk_add_backlog(sk, skb))) {
+	} else if (unlikely(sk_add_backlog(sk, skb,
+					   sk->sk_rcvbuf + sk->sk_sndbuf))) {
 		bh_unlock_sock(sk);
 		NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
 		goto discard_and_relse;
@@ -1829,64 +1834,15 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
 static int tcp_v6_init_sock(struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct tcp_sock *tp = tcp_sk(sk);
-
-	skb_queue_head_init(&tp->out_of_order_queue);
-	tcp_init_xmit_timers(sk);
-	tcp_prequeue_init(tp);
-
-	icsk->icsk_rto = TCP_TIMEOUT_INIT;
-	tp->mdev = TCP_TIMEOUT_INIT;
 
-	/* So many TCP implementations out there (incorrectly) count the
-	 * initial SYN frame in their delayed-ACK and congestion control
-	 * algorithms that we must have the following bandaid to talk
-	 * efficiently to them.  -DaveM
-	 */
-	tp->snd_cwnd = 2;
-
-	/* See draft-stevens-tcpca-spec-01 for discussion of the
-	 * initialization of these values.
-	 */
-	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
-	tp->snd_cwnd_clamp = ~0;
-	tp->mss_cache = TCP_MSS_DEFAULT;
-
-	tp->reordering = sysctl_tcp_reordering;
-
-	sk->sk_state = TCP_CLOSE;
+	tcp_init_sock(sk);
 
 	icsk->icsk_af_ops = &ipv6_specific;
-	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
-	icsk->icsk_sync_mss = tcp_sync_mss;
-	sk->sk_write_space = sk_stream_write_space;
-	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
 
 #ifdef CONFIG_TCP_MD5SIG
-	tp->af_specific = &tcp_sock_ipv6_specific;
+	tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
 #endif
 
-	/* TCP Cookie Transactions */
-	if (sysctl_tcp_cookie_size > 0) {
-		/* Default, cookies without s_data_payload. */
-		tp->cookie_values =
-			kzalloc(sizeof(*tp->cookie_values),
-				sk->sk_allocation);
-		if (tp->cookie_values != NULL)
-			kref_init(&tp->cookie_values->kref);
-	}
-	/* Presumed zeroed, in order of appearance:
-	 *	cookie_in_always, cookie_out_never,
-	 *	s_data_constant, s_data_in, s_data_out
-	 */
-	sk->sk_sndbuf = sysctl_tcp_wmem[1];
-	sk->sk_rcvbuf = sysctl_tcp_rmem[1];
-
-	local_bh_disable();
-	sock_update_memcg(sk);
-	sk_sockets_allocated_inc(sk);
-	local_bh_enable();
-
 	return 0;
 }