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

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[ Upstream commit 4fd44a98ff ]

commit 079096f103 ("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: 079096f103 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frank van der Linden 2018-06-12 23:09:37 +00:00 committed by Greg Kroah-Hartman
parent b397cdd854
commit 48ffbdea28
2 changed files with 8 additions and 0 deletions
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4
net/ipv4/tcp_ipv4.c
View File

@ -1627,6 +1627,10 @@ 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;

4
net/ipv6/tcp_ipv6.c
View File

@ -1415,6 +1415,10 @@ 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;