Commit 4fd44a98 authored Jun 12, 2018 by Frank van der Linden Committed by David S. Miller Jun 14, 2018

tcp: verify the checksum of the first data segment in a new connection



commit 079096f1 ("tcp/dccp: install syn_recv requests into ehash
table") introduced an optimization for the handling of child sockets
created for a new TCP connection.

But this optimization passes any data associated with the last ACK of the
connection handshake up the stack without verifying its checksum, because it
calls tcp_child_process(), which in turn calls tcp_rcv_state_process()
directly.  These lower-level processing functions do not do any checksum
verification.

Insert a tcp_checksum_complete call in the TCP_NEW_SYN_RECEIVE path to
fix this.

Fixes: 079096f1 ("tcp/dccp: install syn_recv requests into ehash table")
Signed-off-by: Frank van der Linden <fllinden@amazon.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent bdf767ca

net/ipv4/tcp_ipv4.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1730,6 +1730,10 @@ int tcp_v4_rcv(struct sk_buff *skb)
		reqsk_put(req);
		goto discard_it;
		}
		if (tcp_checksum_complete(skb)) {
		reqsk_put(req);
		goto csum_error;
		}
		if (unlikely(sk->sk_state != TCP_LISTEN)) {
		inet_csk_reqsk_queue_drop_and_put(sk, req);
		goto lookup;

net/ipv6/tcp_ipv6.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1479,6 +1479,10 @@ static int tcp_v6_rcv(struct sk_buff *skb)
		reqsk_put(req);
		goto discard_it;
		}
		if (tcp_checksum_complete(skb)) {
		reqsk_put(req);
		goto csum_error;
		}
		if (unlikely(sk->sk_state != TCP_LISTEN)) {
		inet_csk_reqsk_queue_drop_and_put(sk, req);
		goto lookup;