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tcp: send challenge ack for in wnd syn
[vpp.git]
/
src
/
vnet
/
tcp
/
tcp_input.c
diff --git
a/src/vnet/tcp/tcp_input.c
b/src/vnet/tcp/tcp_input.c
index
d116af8
..
a438709
100644
(file)
--- a/
src/vnet/tcp/tcp_input.c
+++ b/
src/vnet/tcp/tcp_input.c
@@
-390,8
+390,9
@@
tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0,
/* 4th: check the SYN bit (in window) */
if (PREDICT_FALSE (tcp_syn (th0)))
{
+ /* As per RFC5961 send challenge ack instead of reset */
+ tcp_program_ack (wrk, tc0);
*error0 = TCP_ERROR_SPURIOUS_SYN;
- tcp_send_reset (tc0);
goto error;
}