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authorNeale Ranns <nranns@cisco.com>2019-04-11 15:14:07 +0000
committerDamjan Marion <dmarion@me.com>2019-04-16 15:54:31 +0000
commit47feb1146ec3b0e1cf2ebd83cd5211e1df261194 (patch)
tree602218094ef655d3c430ba29762ebf64d59f15d7 /src/vnet/ipsec/esp_decrypt.c
parent3cf215aab7237d44cf153b43d80a971be9300626 (diff)
IPSEC: support GCM in ESP
Change-Id: Id2ddb77b4ec3dd543d6e638bc882923f2bac011d Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/ipsec/esp_decrypt.c')
-rw-r--r--src/vnet/ipsec/esp_decrypt.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c
index c94577a5d5a..d2365fce2d8 100644
--- a/src/vnet/ipsec/esp_decrypt.c
+++ b/src/vnet/ipsec/esp_decrypt.c
@@ -197,7 +197,7 @@ esp_decrypt_inline (vlib_main_t * vm,
current_sa_pkts += 1;
current_sa_bytes += pd->current_length;
- if (PREDICT_TRUE (cpd.icv_sz > 0))
+ if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE))
{
vnet_crypto_op_t *op;
vec_add2_aligned (ptd->integ_ops, op, 1, CLIB_CACHE_LINE_BYTES);
@@ -233,6 +233,39 @@ esp_decrypt_inline (vlib_main_t * vm,
vnet_crypto_op_init (op, sa0->crypto_dec_op_id);
op->key = sa0->crypto_key.data;
op->iv = payload;
+
+ if (ipsec_sa_is_set_IS_AEAD (sa0))
+ {
+ esp_header_t *esp0;
+ esp_aead_t *aad;
+ u8 *scratch;
+ u32 salt;
+
+ /*
+ * construct the AAD and the nonce (Salt || IV) in a scratch
+ * space in front of the IP header.
+ */
+ scratch = payload - esp_sz;
+ esp0 = (esp_header_t *) (scratch);
+
+ scratch -= (sizeof (*aad) + pd->hdr_sz);
+ op->aad = scratch;
+
+ esp_aad_fill (op, esp0, sa0);
+
+ /*
+ * we don't need to refer to the ESP header anymore so we
+ * can overwrite it with the salt and use the IV where it is
+ * to form the nonce = (Salt + IV)
+ */
+ salt = clib_host_to_net_u32 (sa0->salt);
+ op->iv -= sizeof (sa0->salt);
+ clib_memcpy_fast (op->iv, &salt, sizeof (sa0->salt));
+ op->iv_len = cpd.iv_sz + sizeof (sa0->salt);
+
+ op->tag = payload + len;
+ op->tag_len = 16;
+ }
op->src = op->dst = payload += cpd.iv_sz;
op->len = len - cpd.iv_sz;
op->user_data = b - bufs;