diff options
| author |   Florin Coras <fcoras@cisco.com> | 2018-12-12 14:34:38 -0800 |
|---|---|---|
| committer |   Dave Barach <openvpp@barachs.net> | 2018-12-13 13:40:45 +0000 |
| commit | 4850e3e73c61830516ac9ccb22976be685bea3b5 (patch) | |
| tree | 848afd0b0611954bc1941c7bd8fd4dc158a71722 /src/vnet/tcp | |
| parent | 42ceddb7cd836a89a12b0b8e623b06bc4c0cc0cb (diff) | |
tcp: validate seq for handshake ack
Change-Id: Ifc0584d781efc30904069ea17c0afbb68c49c442
Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp')
| -rw-r--r-- | src/vnet/tcp/tcp_input.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index f04fa5d8901..395943739e8 100644 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -2724,6 +2724,14 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, goto drop; } + /* Make sure the ack is exactly right */ + if (tc0->rcv_nxt != vnet_buffer (b0)->tcp.seq_number) + { + error0 = TCP_ERROR_SEGMENT_INVALID; + tcp_send_reset_w_pkt (tc0, b0, is_ip4); + goto drop; + } + /* Update rtt and rto */ tcp_estimate_initial_rtt (tc0); |