2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 #include <vnet/ip/ip.h>
19 #include <vnet/crypto/crypto.h>
20 #include <vnet/ipsec/ipsec.h>
36 typedef CLIB_PACKED (struct {
39 }) ip4_and_esp_header_t;
43 typedef CLIB_PACKED (struct {
47 }) ip4_and_udp_and_esp_header_t;
51 typedef CLIB_PACKED (struct {
54 }) ip6_and_esp_header_t;
58 * AES GCM Additional Authentication data
60 typedef struct esp_aead_t_
63 * for GCM: when using ESN it's:
64 * SPI, seq-hi, seg-low
69 } __clib_packed esp_aead_t;
71 #define ESP_SEQ_MAX (4294967295UL)
72 #define ESP_MAX_BLOCK_SIZE (16)
73 #define ESP_MAX_IV_SIZE (16)
74 #define ESP_MAX_ICV_SIZE (32)
76 u8 *format_esp_header (u8 * s, va_list * args);
78 /* TODO seq increment should be atomic to be accessed by multiple workers */
80 esp_seq_advance (ipsec_sa_t * sa)
82 if (PREDICT_TRUE (ipsec_sa_is_set_USE_ESN (sa)))
84 if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX))
86 if (PREDICT_FALSE (ipsec_sa_is_set_USE_ANTI_REPLAY (sa) &&
87 sa->seq_hi == ESP_SEQ_MAX))
95 if (PREDICT_FALSE (ipsec_sa_is_set_USE_ANTI_REPLAY (sa) &&
96 sa->seq == ESP_SEQ_MAX))
105 always_inline unsigned int
106 hmac_calc (vlib_main_t * vm, ipsec_sa_t * sa, u8 * data, int data_len,
109 vnet_crypto_op_t _op, *op = &_op;
111 if (PREDICT_FALSE (sa->integ_op_id == 0))
114 vnet_crypto_op_init (op, sa->integ_op_id);
115 op->key_index = sa->integ_key_index;
118 op->digest = signature;
119 op->digest_len = sa->integ_icv_size;
121 if (ipsec_sa_is_set_USE_ESN (sa))
123 u32 seq_hi = clib_host_to_net_u32 (sa->seq_hi);
126 clib_memcpy (data + data_len, &seq_hi, 4);
129 vnet_crypto_process_ops (vm, op, 1);
130 return sa->integ_icv_size;
134 esp_aad_fill (vnet_crypto_op_t * op,
135 const esp_header_t * esp, const ipsec_sa_t * sa)
139 aad = (esp_aead_t *) op->aad;
140 clib_memcpy_fast (aad, esp, 8);
142 if (ipsec_sa_is_set_USE_ESN (sa))
144 /* SPI, seq-hi, seq-low */
145 aad->data[2] = aad->data[1];
146 aad->data[1] = clib_host_to_net_u32 (sa->seq_hi);
153 #endif /* __ESP_H__ */
156 * fd.io coding-style-patch-verification: ON
159 * eval: (c-set-style "gnu")