| /* |
| * Copyright (c) 2015 Cisco and/or its affiliates. |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #ifndef __ESP_H__ |
| #define __ESP_H__ |
| |
| #include <vnet/ip/ip.h> |
| #include <vnet/ipsec/ipsec.h> |
| |
| #include <openssl/hmac.h> |
| #include <openssl/rand.h> |
| #include <openssl/evp.h> |
| |
| typedef struct |
| { |
| u32 spi; |
| u32 seq; |
| u8 data[0]; |
| } esp_header_t; |
| |
| typedef struct |
| { |
| u8 pad_length; |
| u8 next_header; |
| } esp_footer_t; |
| |
| /* *INDENT-OFF* */ |
| typedef CLIB_PACKED (struct { |
| ip4_header_t ip4; |
| esp_header_t esp; |
| }) ip4_and_esp_header_t; |
| /* *INDENT-ON* */ |
| |
| /* *INDENT-OFF* */ |
| typedef CLIB_PACKED (struct { |
| ip6_header_t ip6; |
| esp_header_t esp; |
| }) ip6_and_esp_header_t; |
| /* *INDENT-ON* */ |
| |
| typedef struct |
| { |
| const EVP_CIPHER *type; |
| } ipsec_proto_main_crypto_alg_t; |
| |
| typedef struct |
| { |
| const EVP_MD *md; |
| u8 trunc_size; |
| } ipsec_proto_main_integ_alg_t; |
| |
| typedef struct |
| { |
| CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); |
| #if OPENSSL_VERSION_NUMBER >= 0x10100000L |
| EVP_CIPHER_CTX *encrypt_ctx; |
| #else |
| EVP_CIPHER_CTX encrypt_ctx; |
| #endif |
| CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); |
| #if OPENSSL_VERSION_NUMBER >= 0x10100000L |
| EVP_CIPHER_CTX *decrypt_ctx; |
| #else |
| EVP_CIPHER_CTX decrypt_ctx; |
| #endif |
| CLIB_CACHE_LINE_ALIGN_MARK (cacheline2); |
| #if OPENSSL_VERSION_NUMBER >= 0x10100000L |
| HMAC_CTX *hmac_ctx; |
| #else |
| HMAC_CTX hmac_ctx; |
| #endif |
| ipsec_crypto_alg_t last_encrypt_alg; |
| ipsec_crypto_alg_t last_decrypt_alg; |
| ipsec_integ_alg_t last_integ_alg; |
| } ipsec_proto_main_per_thread_data_t; |
| |
| typedef struct |
| { |
| ipsec_proto_main_crypto_alg_t *ipsec_proto_main_crypto_algs; |
| ipsec_proto_main_integ_alg_t *ipsec_proto_main_integ_algs; |
| ipsec_proto_main_per_thread_data_t *per_thread_data; |
| } ipsec_proto_main_t; |
| |
| extern ipsec_proto_main_t ipsec_proto_main; |
| |
| #define ESP_WINDOW_SIZE (64) |
| #define ESP_SEQ_MAX (4294967295UL) |
| |
| u8 *format_esp_header (u8 * s, va_list * args); |
| |
| always_inline int |
| esp_replay_check (ipsec_sa_t * sa, u32 seq) |
| { |
| u32 diff; |
| |
| if (PREDICT_TRUE (seq > sa->last_seq)) |
| return 0; |
| |
| diff = sa->last_seq - seq; |
| |
| if (ESP_WINDOW_SIZE > diff) |
| return (sa->replay_window & (1ULL << diff)) ? 1 : 0; |
| else |
| return 1; |
| |
| return 0; |
| } |
| |
| always_inline int |
| esp_replay_check_esn (ipsec_sa_t * sa, u32 seq) |
| { |
| u32 tl = sa->last_seq; |
| u32 th = sa->last_seq_hi; |
| u32 diff = tl - seq; |
| |
| if (PREDICT_TRUE (tl >= (ESP_WINDOW_SIZE - 1))) |
| { |
| if (seq >= (tl - ESP_WINDOW_SIZE + 1)) |
| { |
| sa->seq_hi = th; |
| if (seq <= tl) |
| return (sa->replay_window & (1ULL << diff)) ? 1 : 0; |
| else |
| return 0; |
| } |
| else |
| { |
| sa->seq_hi = th + 1; |
| return 0; |
| } |
| } |
| else |
| { |
| if (seq >= (tl - ESP_WINDOW_SIZE + 1)) |
| { |
| sa->seq_hi = th - 1; |
| return (sa->replay_window & (1ULL << diff)) ? 1 : 0; |
| } |
| else |
| { |
| sa->seq_hi = th; |
| if (seq <= tl) |
| return (sa->replay_window & (1ULL << diff)) ? 1 : 0; |
| else |
| return 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* TODO seq increment should be atomic to be accessed by multiple workers */ |
| always_inline void |
| esp_replay_advance (ipsec_sa_t * sa, u32 seq) |
| { |
| u32 pos; |
| |
| if (seq > sa->last_seq) |
| { |
| pos = seq - sa->last_seq; |
| if (pos < ESP_WINDOW_SIZE) |
| sa->replay_window = ((sa->replay_window) << pos) | 1; |
| else |
| sa->replay_window = 1; |
| sa->last_seq = seq; |
| } |
| else |
| { |
| pos = sa->last_seq - seq; |
| sa->replay_window |= (1ULL << pos); |
| } |
| } |
| |
| always_inline void |
| esp_replay_advance_esn (ipsec_sa_t * sa, u32 seq) |
| { |
| int wrap = sa->seq_hi - sa->last_seq_hi; |
| u32 pos; |
| |
| if (wrap == 0 && seq > sa->last_seq) |
| { |
| pos = seq - sa->last_seq; |
| if (pos < ESP_WINDOW_SIZE) |
| sa->replay_window = ((sa->replay_window) << pos) | 1; |
| else |
| sa->replay_window = 1; |
| sa->last_seq = seq; |
| } |
| else if (wrap > 0) |
| { |
| pos = ~seq + sa->last_seq + 1; |
| if (pos < ESP_WINDOW_SIZE) |
| sa->replay_window = ((sa->replay_window) << pos) | 1; |
| else |
| sa->replay_window = 1; |
| sa->last_seq = seq; |
| sa->last_seq_hi = sa->seq_hi; |
| } |
| else if (wrap < 0) |
| { |
| pos = ~seq + sa->last_seq + 1; |
| sa->replay_window |= (1ULL << pos); |
| } |
| else |
| { |
| pos = sa->last_seq - seq; |
| sa->replay_window |= (1ULL << pos); |
| } |
| } |
| |
| always_inline int |
| esp_seq_advance (ipsec_sa_t * sa) |
| { |
| if (PREDICT_TRUE (sa->use_esn)) |
| { |
| if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX)) |
| { |
| if (PREDICT_FALSE |
| (sa->use_anti_replay && sa->seq_hi == ESP_SEQ_MAX)) |
| return 1; |
| sa->seq_hi++; |
| } |
| sa->seq++; |
| } |
| else |
| { |
| if (PREDICT_FALSE (sa->use_anti_replay && sa->seq == ESP_SEQ_MAX)) |
| return 1; |
| sa->seq++; |
| } |
| |
| return 0; |
| } |
| |
| always_inline void |
| ipsec_proto_init () |
| { |
| ipsec_proto_main_t *em = &ipsec_proto_main; |
| vlib_thread_main_t *tm = vlib_get_thread_main (); |
| |
| memset (em, 0, sizeof (em[0])); |
| |
| vec_validate (em->ipsec_proto_main_crypto_algs, IPSEC_CRYPTO_N_ALG - 1); |
| em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_128].type = |
| EVP_aes_128_cbc (); |
| em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_192].type = |
| EVP_aes_192_cbc (); |
| em->ipsec_proto_main_crypto_algs[IPSEC_CRYPTO_ALG_AES_CBC_256].type = |
| EVP_aes_256_cbc (); |
| |
| vec_validate (em->ipsec_proto_main_integ_algs, IPSEC_INTEG_N_ALG - 1); |
| ipsec_proto_main_integ_alg_t *i; |
| |
| i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA1_96]; |
| i->md = EVP_sha1 (); |
| i->trunc_size = 12; |
| |
| i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_256_96]; |
| i->md = EVP_sha256 (); |
| i->trunc_size = 12; |
| |
| i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_256_128]; |
| i->md = EVP_sha256 (); |
| i->trunc_size = 16; |
| |
| i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_384_192]; |
| i->md = EVP_sha384 (); |
| i->trunc_size = 24; |
| |
| i = &em->ipsec_proto_main_integ_algs[IPSEC_INTEG_ALG_SHA_512_256]; |
| i->md = EVP_sha512 (); |
| i->trunc_size = 32; |
| |
| vec_validate_aligned (em->per_thread_data, tm->n_vlib_mains - 1, |
| CLIB_CACHE_LINE_BYTES); |
| int thread_id; |
| |
| for (thread_id = 0; thread_id < tm->n_vlib_mains - 1; thread_id++) |
| { |
| #if OPENSSL_VERSION_NUMBER >= 0x10100000L |
| em->per_thread_data[thread_id].encrypt_ctx = EVP_CIPHER_CTX_new (); |
| em->per_thread_data[thread_id].decrypt_ctx = EVP_CIPHER_CTX_new (); |
| em->per_thread_data[thread_id].hmac_ctx = HMAC_CTX_new (); |
| #else |
| EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].encrypt_ctx)); |
| EVP_CIPHER_CTX_init (&(em->per_thread_data[thread_id].decrypt_ctx)); |
| HMAC_CTX_init (&(em->per_thread_data[thread_id].hmac_ctx)); |
| #endif |
| } |
| } |
| |
| always_inline unsigned int |
| hmac_calc (ipsec_integ_alg_t alg, |
| u8 * key, |
| int key_len, |
| u8 * data, int data_len, u8 * signature, u8 use_esn, u32 seq_hi) |
| { |
| ipsec_proto_main_t *em = &ipsec_proto_main; |
| u32 thread_index = vlib_get_thread_index (); |
| #if OPENSSL_VERSION_NUMBER >= 0x10100000L |
| HMAC_CTX *ctx = em->per_thread_data[thread_index].hmac_ctx; |
| #else |
| HMAC_CTX *ctx = &(em->per_thread_data[thread_index].hmac_ctx); |
| #endif |
| const EVP_MD *md = NULL; |
| unsigned int len; |
| |
| ASSERT (alg < IPSEC_INTEG_N_ALG); |
| |
| if (PREDICT_FALSE (em->ipsec_proto_main_integ_algs[alg].md == 0)) |
| return 0; |
| |
| if (PREDICT_FALSE (alg != em->per_thread_data[thread_index].last_integ_alg)) |
| { |
| md = em->ipsec_proto_main_integ_algs[alg].md; |
| em->per_thread_data[thread_index].last_integ_alg = alg; |
| } |
| |
| HMAC_Init_ex (ctx, key, key_len, md, NULL); |
| |
| HMAC_Update (ctx, data, data_len); |
| |
| if (PREDICT_TRUE (use_esn)) |
| HMAC_Update (ctx, (u8 *) & seq_hi, sizeof (seq_hi)); |
| HMAC_Final (ctx, signature, &len); |
| |
| return em->ipsec_proto_main_integ_algs[alg].trunc_size; |
| } |
| |
| #endif /* __ESP_H__ */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |