diff options
| author | Frank van der Linden <fllinden@amazon.com> | 2018-06-12 23:09:37 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-06-14 17:04:41 -0700 |
| commit | 4fd44a98ffe0d048246efef67ed640fdf2098a62 (patch) | |
| tree | f579372ac46831d702ee8b3bc08f6cf3e463ca91 /net/ipv4/tcp_ipv4.c | |
| parent | bdf767cae3dddcb50a9ca09d01bb79df3e384f7b (diff) | |
| download | lwn-4fd44a98ffe0d048246efef67ed640fdf2098a62.tar.gz lwn-4fd44a98ffe0d048246efef67ed640fdf2098a62.zip | |
tcp: verify the checksum of the first data segment in a new connection
commit 079096f103fa ("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: 079096f103fa ("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>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index fed3f1c66167..bea17f1e8302 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1730,6 +1730,10 @@ process: 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; |