#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/ipsec_tun.h>
+#include <vnet/ipsec/ipsec.api_enum.h>
#include <vnet/ipsec/esp.h>
#include <vnet/tunnel/tunnel_dp.h>
ESP_ENCRYPT_N_NEXT,
} esp_encrypt_next_t;
-#define foreach_esp_encrypt_error \
- _ (RX_PKTS, "ESP pkts received") \
- _ (POST_RX_PKTS, "ESP-post pkts received") \
- _ (HANDOFF, "Hand-off") \
- _ (SEQ_CYCLED, "sequence number cycled (packet dropped)") \
- _ (CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \
- _ (CRYPTO_QUEUE_FULL, "crypto queue full (packet dropped)") \
- _ (NO_BUFFERS, "no buffers (packet dropped)") \
- _ (NO_PROTECTION, "no protecting SA (packet dropped)") \
- _ (NO_ENCRYPTION, "no Encrypting SA (packet dropped)")
-
-typedef enum
-{
-#define _(sym,str) ESP_ENCRYPT_ERROR_##sym,
- foreach_esp_encrypt_error
-#undef _
- ESP_ENCRYPT_N_ERROR,
-} esp_encrypt_error_t;
-
-static char *esp_encrypt_error_strings[] = {
-#define _(sym,string) string,
- foreach_esp_encrypt_error
-#undef _
-};
-
typedef struct
{
u32 sa_index;
u32 next_index;
} esp_encrypt_post_trace_t;
+typedef vl_counter_esp_encrypt_enum_t esp_encrypt_error_t;
+
/* packet trace format function */
static u8 *
format_esp_encrypt_trace (u8 * s, va_list * args)
return len;
}
+/* IPsec IV generation: IVs requirements differ depending of the
+ * encryption mode: IVs must be unpredictable for AES-CBC whereas it can
+ * be predictable but should never be reused with the same key material
+ * for CTR and GCM.
+ * We use a packet counter as the IV for CTR and GCM, and to ensure the
+ * IV is unpredictable for CBC, it is then encrypted using the same key
+ * as the message. You can refer to NIST SP800-38a and NIST SP800-38d
+ * for more details. */
+static_always_inline void *
+esp_generate_iv (ipsec_sa_t *sa, void *payload, int iv_sz)
+{
+ ASSERT (iv_sz >= sizeof (u64));
+ u64 *iv = (u64 *) (payload - iv_sz);
+ clib_memset_u8 (iv, 0, iv_sz);
+ *iv = sa->iv_counter++;
+ return iv;
+}
+
static_always_inline void
esp_process_chained_ops (vlib_main_t * vm, vlib_node_runtime_t * node,
vnet_crypto_op_t * ops, vlib_buffer_t * b[],
vnet_crypto_op_t *op;
vec_add2_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
vnet_crypto_op_init (op, sa0->crypto_enc_op_id);
+ u8 *crypto_start = payload;
+ /* esp_add_footer_and_icv() in esp_encrypt_inline() makes sure we always
+ * have enough space for ESP header and footer which includes ICV */
+ ASSERT (payload_len > icv_sz);
+ u16 crypto_len = payload_len - icv_sz;
+
+ /* generate the IV in front of the payload */
+ void *pkt_iv = esp_generate_iv (sa0, payload, iv_sz);
- op->src = op->dst = payload;
op->key_index = sa0->crypto_key_index;
- op->len = payload_len - icv_sz;
op->user_data = bi;
if (ipsec_sa_is_set_IS_CTR (sa0))
{
- ASSERT (sizeof (u64) == iv_sz);
/* construct nonce in a scratch space in front of the IP header */
esp_ctr_nonce_t *nonce =
- (esp_ctr_nonce_t *) (payload - sizeof (u64) - hdr_len -
- sizeof (*nonce));
- u64 *pkt_iv = (u64 *) (payload - sizeof (u64));
-
+ (esp_ctr_nonce_t *) (pkt_iv - hdr_len - sizeof (*nonce));
if (ipsec_sa_is_set_IS_AEAD (sa0))
{
/* constuct aad in a scratch space in front of the nonce */
op->aad = (u8 *) nonce - sizeof (esp_aead_t);
op->aad_len = esp_aad_fill (op->aad, esp, sa0, seq_hi);
- op->tag = payload + op->len;
+ op->tag = payload + crypto_len;
op->tag_len = 16;
}
else
}
nonce->salt = sa0->salt;
- nonce->iv = *pkt_iv = clib_host_to_net_u64 (sa0->ctr_iv_counter++);
+ nonce->iv = *(u64 *) pkt_iv;
op->iv = (u8 *) nonce;
}
else
{
- op->iv = payload - iv_sz;
- op->flags = VNET_CRYPTO_OP_FLAG_INIT_IV;
+ /* construct zero iv in front of the IP header */
+ op->iv = pkt_iv - hdr_len - iv_sz;
+ clib_memset_u8 (op->iv, 0, iv_sz);
+ /* include iv field in crypto */
+ crypto_start -= iv_sz;
+ crypto_len += iv_sz;
}
if (lb != b[0])
op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
op->chunk_index = vec_len (ptd->chunks);
op->tag = vlib_buffer_get_tail (lb) - icv_sz;
- esp_encrypt_chain_crypto (vm, ptd, sa0, b[0], lb, icv_sz, payload,
- payload_len, &op->n_chunks);
+ esp_encrypt_chain_crypto (vm, ptd, sa0, b[0], lb, icv_sz,
+ crypto_start, crypto_len + icv_sz,
+ &op->n_chunks);
+ }
+ else
+ {
+ /* not chained */
+ op->src = op->dst = crypto_start;
+ op->len = crypto_len;
}
}
u8 *tag, *iv, *aad = 0;
u8 flag = 0;
u32 key_index;
- i16 crypto_start_offset, integ_start_offset = 0;
+ i16 crypto_start_offset, integ_start_offset;
u16 crypto_total_len, integ_total_len;
post->next_index = next;
/* crypto */
- crypto_start_offset = payload - b->data;
+ crypto_start_offset = integ_start_offset = payload - b->data;
crypto_total_len = integ_total_len = payload_len - icv_sz;
tag = payload + crypto_total_len;
key_index = sa->linked_key_index;
+ /* generate the IV in front of the payload */
+ void *pkt_iv = esp_generate_iv (sa, payload, iv_sz);
+
if (ipsec_sa_is_set_IS_CTR (sa))
{
- ASSERT (sizeof (u64) == iv_sz);
/* construct nonce in a scratch space in front of the IP header */
- esp_ctr_nonce_t *nonce = (esp_ctr_nonce_t *) (payload - sizeof (u64) -
- hdr_len - sizeof (*nonce));
- u64 *pkt_iv = (u64 *) (payload - sizeof (u64));
-
+ esp_ctr_nonce_t *nonce =
+ (esp_ctr_nonce_t *) (pkt_iv - hdr_len - sizeof (*nonce));
if (ipsec_sa_is_set_IS_AEAD (sa))
{
/* constuct aad in a scratch space in front of the nonce */
}
nonce->salt = sa->salt;
- nonce->iv = *pkt_iv = clib_host_to_net_u64 (sa->ctr_iv_counter++);
+ nonce->iv = *(u64 *) pkt_iv;
iv = (u8 *) nonce;
}
else
{
- iv = payload - iv_sz;
- flag |= VNET_CRYPTO_OP_FLAG_INIT_IV;
+ /* construct zero iv in front of the IP header */
+ iv = pkt_iv - hdr_len - iv_sz;
+ clib_memset_u8 (iv, 0, iv_sz);
+ /* include iv field in crypto */
+ crypto_start_offset -= iv_sz;
+ crypto_total_len += iv_sz;
}
if (lb != b)
/* chain */
flag |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
tag = vlib_buffer_get_tail (lb) - icv_sz;
- crypto_total_len = esp_encrypt_chain_crypto (vm, ptd, sa, b, lb, icv_sz,
- payload, payload_len, 0);
+ crypto_total_len = esp_encrypt_chain_crypto (
+ vm, ptd, sa, b, lb, icv_sz, b->data + crypto_start_offset,
+ crypto_total_len + icv_sz, 0);
}
if (sa->integ_op_id)
{
- integ_start_offset = crypto_start_offset - iv_sz - sizeof (esp_header_t);
+ integ_start_offset -= iv_sz + sizeof (esp_header_t);
integ_total_len += iv_sz + sizeof (esp_header_t);
if (b != lb)
ESP_ENCRYPT_NEXT_HANDOFF_MPLS));
vlib_buffer_t *sync_bufs[VLIB_FRAME_SIZE];
u16 sync_nexts[VLIB_FRAME_SIZE], *sync_next = sync_nexts, n_sync = 0;
- u16 async_nexts[VLIB_FRAME_SIZE], *async_next = async_nexts, n_async = 0;
- u16 noop_nexts[VLIB_FRAME_SIZE], *noop_next = noop_nexts, n_noop = 0;
+ u16 n_async = 0;
+ u16 noop_nexts[VLIB_FRAME_SIZE], n_noop = 0;
u32 sync_bi[VLIB_FRAME_SIZE];
u32 noop_bi[VLIB_FRAME_SIZE];
esp_encrypt_error_t err;
else
l2_len = 0;
+ u16 len;
+ len = payload_len_total + hdr_len - l2_len;
+
if (VNET_LINK_IP6 == lt)
{
ip6_header_t *ip6 = (ip6_header_t *) (old_ip_hdr);
if (PREDICT_TRUE (NULL == ext_hdr))
{
*next_hdr_ptr = ip6->protocol;
- ip6->protocol = IP_PROTOCOL_IPSEC_ESP;
+ ip6->protocol =
+ (udp) ? IP_PROTOCOL_UDP : IP_PROTOCOL_IPSEC_ESP;
}
else
{
*next_hdr_ptr = ext_hdr->next_hdr;
- ext_hdr->next_hdr = IP_PROTOCOL_IPSEC_ESP;
+ ext_hdr->next_hdr =
+ (udp) ? IP_PROTOCOL_UDP : IP_PROTOCOL_IPSEC_ESP;
}
ip6->payload_length =
- clib_host_to_net_u16 (payload_len_total + hdr_len - l2_len -
- sizeof (ip6_header_t));
+ clib_host_to_net_u16 (len - sizeof (ip6_header_t));
}
else if (VNET_LINK_IP4 == lt)
{
- u16 len;
ip4_header_t *ip4 = (ip4_header_t *) (old_ip_hdr);
*next_hdr_ptr = ip4->protocol;
- len = payload_len_total + hdr_len - l2_len;
- if (udp)
- {
- esp_update_ip4_hdr (ip4, len, /* is_transport */ 1, 1);
- udp_len = len - ip_len;
- }
- else
- esp_update_ip4_hdr (ip4, len, /* is_transport */ 1, 0);
+ esp_update_ip4_hdr (ip4, len, /* is_transport */ 1,
+ (udp != NULL));
}
clib_memcpy_le64 (ip_hdr, old_ip_hdr, ip_len);
if (udp)
{
+ udp_len = len - ip_len;
esp_fill_udp_hdr (sa0, udp, udp_len);
}
{
tr->sa_index = sa_index0;
tr->spi = sa0->spi;
- tr->spi = sa0->spi;
tr->seq = sa0->seq;
tr->sa_seq_hi = sa0->seq_hi;
tr->udp_encap = ipsec_sa_is_set_UDP_ENCAP (sa0);
{
noop_bi[n_noop] = from[b - bufs];
n_noop++;
- noop_next++;
}
else if (!is_async)
{
else
{
n_async++;
- async_next++;
}
n_left -= 1;
b += 1;
{
n_noop += esp_async_recycle_failed_submit (
vm, *async_frame, node, ESP_ENCRYPT_ERROR_CRYPTO_ENGINE_ERROR,
- n_sync, noop_bi, noop_nexts, drop_next);
+ n_noop, noop_bi, noop_nexts, drop_next);
vnet_crypto_async_reset_frame (*async_frame);
vnet_crypto_async_free_frame (vm, *async_frame);
}
.format_trace = format_esp_encrypt_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
.n_next_nodes = ESP_ENCRYPT_N_NEXT,
.next_nodes = { [ESP_ENCRYPT_NEXT_DROP4] = "ip4-drop",
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "esp4-encrypt",
- .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
};
/* *INDENT-ON* */
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "esp4-encrypt",
- .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
};
/* *INDENT-ON* */
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "esp4-encrypt",
- .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
};
/* *INDENT-ON* */
.format_trace = format_esp_encrypt_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
.n_next_nodes = ESP_ENCRYPT_N_NEXT,
.next_nodes = {
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "esp4-encrypt-tun",
- .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
};
/* *INDENT-ON* */
.format_trace = format_esp_encrypt_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
.n_next_nodes = ESP_ENCRYPT_N_NEXT,
.next_nodes = {
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "esp-mpls-encrypt-tun",
- .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
};
/* *INDENT-ON* */
.format_trace = format_esp_encrypt_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
- .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
.n_next_nodes = ESP_ENCRYPT_N_NEXT,
.next_nodes = {
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "esp-mpls-encrypt-tun",
- .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
- .error_strings = esp_encrypt_error_strings,
+ .n_errors = ESP_ENCRYPT_N_ERROR,
+ .error_counters = esp_encrypt_error_counters,
};
#ifndef CLIB_MARCH_VARIANT
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