summaryrefslogtreecommitdiffstats
path: root/src/vnet/ipsec/esp_decrypt.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/vnet/ipsec/esp_decrypt.c')
-rw-r--r--src/vnet/ipsec/esp_decrypt.c59
1 files changed, 43 insertions, 16 deletions
diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c
index 74410a8add1..7b74e6e2c67 100644
--- a/src/vnet/ipsec/esp_decrypt.c
+++ b/src/vnet/ipsec/esp_decrypt.c
@@ -745,6 +745,7 @@ esp_decrypt_post_crypto (vlib_main_t *vm, vlib_node_runtime_t *node,
const u8 tun_flags = IPSEC_SA_FLAG_IS_TUNNEL | IPSEC_SA_FLAG_IS_TUNNEL_V6;
u8 pad_length = 0, next_header = 0;
u16 icv_sz;
+ u64 n_lost;
/*
* redo the anti-reply check
@@ -753,32 +754,47 @@ esp_decrypt_post_crypto (vlib_main_t *vm, vlib_node_runtime_t *node,
* check above we did so against the state of the window (W),
* after packet s-1. So each of the packets in the sequence will be
* accepted.
- * This time s will be cheked against Ws-1, s+1 chceked against Ws
- * (i.e. the window state is updated/advnaced)
- * so this time the successive s+! packet will be dropped.
+ * This time s will be cheked against Ws-1, s+1 checked against Ws
+ * (i.e. the window state is updated/advanced)
+ * so this time the successive s+1 packet will be dropped.
* This is a consequence of batching the decrypts. If the
- * check-dcrypt-advance process was done for each packet it would
+ * check-decrypt-advance process was done for each packet it would
* be fine. But we batch the decrypts because it's much more efficient
* to do so in SW and if we offload to HW and the process is async.
*
* You're probably thinking, but this means an attacker can send the
- * above sequence and cause VPP to perform decrpyts that will fail,
+ * above sequence and cause VPP to perform decrypts that will fail,
* and that's true. But if the attacker can determine s (a valid
* sequence number in the window) which is non-trivial, it can generate
* a sequence s, s+1, s+2, s+3, ... s+n and nothing will prevent any
* implementation, sequential or batching, from decrypting these.
*/
- if (ipsec_sa_anti_replay_and_sn_advance (sa0, pd->seq, pd->seq_hi, true,
- NULL))
+ if (PREDICT_FALSE (ipsec_sa_is_set_ANTI_REPLAY_HUGE (sa0)))
{
- esp_decrypt_set_next_index (b, node, vm->thread_index,
- ESP_DECRYPT_ERROR_REPLAY, 0, next,
- ESP_DECRYPT_NEXT_DROP, pd->sa_index);
- return;
+ if (ipsec_sa_anti_replay_and_sn_advance (sa0, pd->seq, pd->seq_hi, true,
+ NULL, true))
+ {
+ esp_decrypt_set_next_index (b, node, vm->thread_index,
+ ESP_DECRYPT_ERROR_REPLAY, 0, next,
+ ESP_DECRYPT_NEXT_DROP, pd->sa_index);
+ return;
+ }
+ n_lost = ipsec_sa_anti_replay_advance (sa0, vm->thread_index, pd->seq,
+ pd->seq_hi, true);
+ }
+ else
+ {
+ if (ipsec_sa_anti_replay_and_sn_advance (sa0, pd->seq, pd->seq_hi, true,
+ NULL, false))
+ {
+ esp_decrypt_set_next_index (b, node, vm->thread_index,
+ ESP_DECRYPT_ERROR_REPLAY, 0, next,
+ ESP_DECRYPT_NEXT_DROP, pd->sa_index);
+ return;
+ }
+ n_lost = ipsec_sa_anti_replay_advance (sa0, vm->thread_index, pd->seq,
+ pd->seq_hi, false);
}
-
- u64 n_lost =
- ipsec_sa_anti_replay_advance (sa0, vm->thread_index, pd->seq, pd->seq_hi);
vlib_prefetch_simple_counter (&ipsec_sa_err_counters[IPSEC_SA_ERROR_LOST],
vm->thread_index, pd->sa_index);
@@ -1046,6 +1062,7 @@ esp_decrypt_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
u32 current_sa_index = ~0, current_sa_bytes = 0, current_sa_pkts = 0;
const u8 esp_sz = sizeof (esp_header_t);
ipsec_sa_t *sa0 = 0;
+ bool anti_replay_result;
vnet_crypto_op_t _op, *op = &_op;
vnet_crypto_op_t **crypto_ops;
vnet_crypto_op_t **integ_ops;
@@ -1163,8 +1180,18 @@ esp_decrypt_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
pd->current_length = b[0]->current_length;
/* anti-reply check */
- if (ipsec_sa_anti_replay_and_sn_advance (sa0, pd->seq, ~0, false,
- &pd->seq_hi))
+ if (PREDICT_FALSE (ipsec_sa_is_set_ANTI_REPLAY_HUGE (sa0)))
+ {
+ anti_replay_result = ipsec_sa_anti_replay_and_sn_advance (
+ sa0, pd->seq, ~0, false, &pd->seq_hi, true);
+ }
+ else
+ {
+ anti_replay_result = ipsec_sa_anti_replay_and_sn_advance (
+ sa0, pd->seq, ~0, false, &pd->seq_hi, false);
+ }
+
+ if (anti_replay_result)
{
err = ESP_DECRYPT_ERROR_REPLAY;
esp_decrypt_set_next_index (b[0], node, thread_index, err, n_noop,