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authorFlorin Coras <fcoras@cisco.com>2019-06-28 09:18:48 -0700
committerDave Wallace <dwallacelf@gmail.com>2019-06-28 17:54:49 +0000
commitf73d4c2084c9cb6df4a1f8582acef523e4ba0cb2 (patch)
tree00a74ad514896a4652e8f4901c9db93dc55918c1
parent182bbc1c5ab3d8607153dd19f0a24baaf5cbfc88 (diff)
tcp: reject out-of-order fins
Type:fix Change-Id: Iab2c308739f7733dbf70953e0ea87dcc404c60da Signed-off-by: Florin Coras <fcoras@cisco.com>
-rw-r--r--src/vnet/tcp/tcp_input.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 23030ee77d2..848028f6940 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1698,6 +1698,10 @@ static void
tcp_rcv_fin (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, vlib_buffer_t * b,
u32 * error)
{
+ /* Reject out-of-order fins */
+ if (vnet_buffer (b)->tcp.seq_end != tc->rcv_nxt)
+ return;
+
/* Account for the FIN and send ack */
tc->rcv_nxt += 1;
tcp_program_ack (wrk, tc);