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-rw-r--r--src/vnet/ipsec/ipsec_tun_in.c29
1 files changed, 21 insertions, 8 deletions
diff --git a/src/vnet/ipsec/ipsec_tun_in.c b/src/vnet/ipsec/ipsec_tun_in.c
index 4f8af006d2b..c414be05f7e 100644
--- a/src/vnet/ipsec/ipsec_tun_in.c
+++ b/src/vnet/ipsec/ipsec_tun_in.c
@@ -186,18 +186,35 @@ ipsec_tun_protect_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
{
ip60 = (ip6_header_t *) ip40;
esp0 = (esp_header_t *) (ip60 + 1);
- hdr_sz0 = sizeof (ip6_header_t);
+ buf_rewind0 = hdr_sz0 = sizeof (ip6_header_t);
}
else
{
- /* NAT UDP port 4500 case, don't advance any more */
if (ip40->protocol == IP_PROTOCOL_UDP)
{
+ /* NAT UDP port 4500 case, don't advance any more */
esp0 =
(esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40) +
sizeof (udp_header_t));
hdr_sz0 = 0;
buf_rewind0 = ip4_header_bytes (ip40) + sizeof (udp_header_t);
+
+ const udp_header_t *udp0 =
+ (udp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40));
+
+ /* length 9 = sizeof(udp_header) + 1 byte of special SPI */
+ if (clib_net_to_host_u16 (udp0->length) == 9 &&
+ esp0->spi_bytes[0] == 0xff)
+ {
+ b[0]->error =
+ node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_NAT_KEEPALIVE];
+
+ next[0] = VNET_DEVICE_INPUT_NEXT_IP4_DROP;
+ len0 = 0;
+
+ vlib_buffer_advance (b[0], -buf_rewind0);
+ goto trace00;
+ }
}
else
{
@@ -213,15 +230,11 @@ ipsec_tun_protect_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
if (len0 < sizeof (esp_header_t))
{
- if (esp0->spi_bytes[0] == 0xff)
- b[0]->error =
- node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_NAT_KEEPALIVE];
- else
- b[0]->error =
- node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_TOO_SHORT];
+ b[0]->error = node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_TOO_SHORT];
next[0] = is_ip6 ? VNET_DEVICE_INPUT_NEXT_IP6_DROP :
VNET_DEVICE_INPUT_NEXT_IP4_DROP;
+ vlib_buffer_advance (b[0], -buf_rewind0);
goto trace00;
}