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/ipsec/ipsec.h>
21 #include <openssl/hmac.h>
22 #include <openssl/rand.h>
23 #include <openssl/evp.h>
39 typedef CLIB_PACKED (struct {
42 }) ip4_and_esp_header_t;
46 typedef CLIB_PACKED (struct {
49 }) ip6_and_esp_header_t;
54 const EVP_CIPHER *type;
65 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
66 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
67 EVP_CIPHER_CTX *encrypt_ctx;
69 EVP_CIPHER_CTX encrypt_ctx;
71 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
72 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
73 EVP_CIPHER_CTX *decrypt_ctx;
75 EVP_CIPHER_CTX decrypt_ctx;
77 CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
78 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
83 ipsec_crypto_alg_t last_encrypt_alg;
84 ipsec_crypto_alg_t last_decrypt_alg;
85 ipsec_integ_alg_t last_integ_alg;
86 } esp_main_per_thread_data_t;
90 esp_crypto_alg_t *esp_crypto_algs;
91 esp_integ_alg_t *esp_integ_algs;
92 esp_main_per_thread_data_t *per_thread_data;
95 extern esp_main_t esp_main;
97 #define ESP_WINDOW_SIZE (64)
98 #define ESP_SEQ_MAX (4294967295UL)
100 u8 *format_esp_header (u8 * s, va_list * args);
103 esp_replay_check (ipsec_sa_t * sa, u32 seq)
107 if (PREDICT_TRUE (seq > sa->last_seq))
110 diff = sa->last_seq - seq;
112 if (ESP_WINDOW_SIZE > diff)
113 return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
121 esp_replay_check_esn (ipsec_sa_t * sa, u32 seq)
123 u32 tl = sa->last_seq;
124 u32 th = sa->last_seq_hi;
127 if (PREDICT_TRUE (tl >= (ESP_WINDOW_SIZE - 1)))
129 if (seq >= (tl - ESP_WINDOW_SIZE + 1))
133 return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
145 if (seq >= (tl - ESP_WINDOW_SIZE + 1))
148 return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
154 return (sa->replay_window & (1ULL << diff)) ? 1 : 0;
163 /* TODO seq increment should be atomic to be accessed by multiple workers */
165 esp_replay_advance (ipsec_sa_t * sa, u32 seq)
169 if (seq > sa->last_seq)
171 pos = seq - sa->last_seq;
172 if (pos < ESP_WINDOW_SIZE)
173 sa->replay_window = ((sa->replay_window) << pos) | 1;
175 sa->replay_window = 1;
180 pos = sa->last_seq - seq;
181 sa->replay_window |= (1ULL << pos);
186 esp_replay_advance_esn (ipsec_sa_t * sa, u32 seq)
188 int wrap = sa->seq_hi - sa->last_seq_hi;
191 if (wrap == 0 && seq > sa->last_seq)
193 pos = seq - sa->last_seq;
194 if (pos < ESP_WINDOW_SIZE)
195 sa->replay_window = ((sa->replay_window) << pos) | 1;
197 sa->replay_window = 1;
202 pos = ~seq + sa->last_seq + 1;
203 if (pos < ESP_WINDOW_SIZE)
204 sa->replay_window = ((sa->replay_window) << pos) | 1;
206 sa->replay_window = 1;
208 sa->last_seq_hi = sa->seq_hi;
212 pos = ~seq + sa->last_seq + 1;
213 sa->replay_window |= (1ULL << pos);
217 pos = sa->last_seq - seq;
218 sa->replay_window |= (1ULL << pos);
223 esp_seq_advance (ipsec_sa_t * sa)
225 if (PREDICT_TRUE (sa->use_esn))
227 if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX))
230 (sa->use_anti_replay && sa->seq_hi == ESP_SEQ_MAX))
238 if (PREDICT_FALSE (sa->use_anti_replay && sa->seq == ESP_SEQ_MAX))
249 esp_main_t *em = &esp_main;
250 vlib_thread_main_t *tm = vlib_get_thread_main ();
252 memset (em, 0, sizeof (em[0]));
254 vec_validate (em->esp_crypto_algs, IPSEC_CRYPTO_N_ALG - 1);
255 em->esp_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].type = EVP_aes_128_cbc ();
256 em->esp_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].type = EVP_aes_192_cbc ();
257 em->esp_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].type = EVP_aes_256_cbc ();
259 vec_validate (em->esp_integ_algs, IPSEC_INTEG_N_ALG - 1);
262 i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA1_96];
266 i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_256_96];
267 i->md = EVP_sha256 ();
270 i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_256_128];
271 i->md = EVP_sha256 ();
274 i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_384_192];
275 i->md = EVP_sha384 ();
278 i = &em->esp_integ_algs[IPSEC_INTEG_ALG_SHA_512_256];
279 i->md = EVP_sha512 ();
282 vec_validate_aligned (em->per_thread_data, tm->n_vlib_mains - 1,
283 CLIB_CACHE_LINE_BYTES);
286 for (thread_id = 0; thread_id < tm->n_vlib_mains - 1; thread_id++)
288 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
289 em->per_thread_data[thread_id].encrypt_ctx = EVP_CIPHER_CTX_new ();
290 em->per_thread_data[thread_id].decrypt_ctx = EVP_CIPHER_CTX_new ();
291 em->per_thread_data[thread_id].hmac_ctx = HMAC_CTX_new ();
293 EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].encrypt_ctx));
294 EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].decrypt_ctx));
295 HMAC_CTX_init (&(em->per_thread_data[thread_id].hmac_ctx));
300 always_inline unsigned int
301 hmac_calc (ipsec_integ_alg_t alg,
304 u8 * data, int data_len, u8 * signature, u8 use_esn, u32 seq_hi)
306 esp_main_t *em = &esp_main;
307 u32 thread_index = vlib_get_thread_index ();
308 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
309 HMAC_CTX *ctx = em->per_thread_data[thread_index].hmac_ctx;
311 HMAC_CTX *ctx = &(em->per_thread_data[thread_index].hmac_ctx);
313 const EVP_MD *md = NULL;
316 ASSERT (alg < IPSEC_INTEG_N_ALG);
318 if (PREDICT_FALSE (em->esp_integ_algs[alg].md == 0))
321 if (PREDICT_FALSE (alg != em->per_thread_data[thread_index].last_integ_alg))
323 md = em->esp_integ_algs[alg].md;
324 em->per_thread_data[thread_index].last_integ_alg = alg;
327 HMAC_Init_ex (ctx, key, key_len, md, NULL);
329 HMAC_Update (ctx, data, data_len);
331 if (PREDICT_TRUE (use_esn))
332 HMAC_Update (ctx, (u8 *) & seq_hi, sizeof (seq_hi));
333 HMAC_Final (ctx, signature, &len);
335 return em->esp_integ_algs[alg].trunc_size;
338 #endif /* __ESP_H__ */
341 * fd.io coding-style-patch-verification: ON
344 * eval: (c-set-style "gnu")