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path: root/src/vnet/ipsec/esp_decrypt.c
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Diffstat (limited to 'src/vnet/ipsec/esp_decrypt.c')
-rw-r--r--src/vnet/ipsec/esp_decrypt.c29
1 files changed, 22 insertions, 7 deletions
diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c
index 16ae3a3d9eb..ee53b018552 100644
--- a/src/vnet/ipsec/esp_decrypt.c
+++ b/src/vnet/ipsec/esp_decrypt.c
@@ -53,6 +53,7 @@ typedef enum
_(OVERSIZED_HEADER, "buffer with oversized header (dropped)") \
_(NO_TAIL_SPACE, "no enough buffer tail space (dropped)") \
_(TUN_NO_PROTO, "no tunnel protocol") \
+ _(UNSUP_PAYLOAD, "unsupported payload") \
typedef enum
@@ -311,9 +312,10 @@ esp_decrypt_inline (vlib_main_t * vm,
b += 1;
}
- vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
- current_sa_index, current_sa_pkts,
- current_sa_bytes);
+ if (PREDICT_TRUE (~0 != current_sa_index))
+ vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
+ current_sa_index, current_sa_pkts,
+ current_sa_bytes);
if ((n = vec_len (ptd->integ_ops)))
{
@@ -513,6 +515,8 @@ esp_decrypt_inline (vlib_main_t * vm,
next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
break;
default:
+ b[0]->error =
+ node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
next[0] = ESP_DECRYPT_NEXT_DROP;
break;
}
@@ -520,8 +524,7 @@ esp_decrypt_inline (vlib_main_t * vm,
else
{
next[0] = ESP_DECRYPT_NEXT_DROP;
- b[0]->error =
- node->errors[ESP_DECRYPT_ERROR_DECRYPTION_FAILED];
+ b[0]->error = node->errors[ESP_DECRYPT_ERROR_UNSUP_PAYLOAD];
goto trace;
}
}
@@ -530,8 +533,20 @@ esp_decrypt_inline (vlib_main_t * vm,
if (ipsec_sa_is_set_IS_PROTECT (sa0))
{
/*
- * Check that the reveal IP header matches that
- * of the tunnel we are protecting
+ * There are two encap possibilities
+ * 1) the tunnel and ths SA are prodiving encap, i.e. it's
+ * MAC | SA-IP | TUN-IP | ESP | PAYLOAD
+ * implying the SA is in tunnel mode (on a tunnel interface)
+ * 2) only the tunnel provides encap
+ * MAC | TUN-IP | ESP | PAYLOAD
+ * implying the SA is in transport mode.
+ *
+ * For 2) we need only strip the tunnel encap and we're good.
+ * since the tunnel and crypto ecnap (int the tun=protect
+ * object) are the same and we verified above that these match
+ * for 1) we need to strip the SA-IP outer headers, to
+ * reveal the tunnel IP and then check that this matches
+ * the configured tunnel.
*/
const ipsec_tun_protect_t *itp;