/* * 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/crypto/crypto.h> #include <vnet/ipsec/ipsec.h> typedef struct { union { u32 spi; u8 spi_bytes[4]; }; 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 { ip4_header_t ip4; udp_header_t udp; esp_header_t esp; }) ip4_and_udp_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* */ /** * AES GCM Additional Authentication data */ typedef struct esp_aead_t_ { /** * for GCM: when using ESN it's: * SPI, seq-hi, seg-low * else * SPI, seq-low */ u32 data[3]; } __clib_packed esp_aead_t; #define ESP_SEQ_MAX (4294967295UL) #define ESP_MAX_BLOCK_SIZE (16) #define ESP_MAX_IV_SIZE (16) #define ESP_MAX_ICV_SIZE (32) u8 *format_esp_header (u8 * s, va_list * args); /* TODO seq increment should be atomic to be accessed by multiple workers */ always_inline int esp_seq_advance (ipsec_sa_t * sa) { if (PREDICT_TRUE (ipsec_sa_is_set_USE_ESN (sa))) { if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX)) { if (PREDICT_FALSE (ipsec_sa_is_set_USE_ANTI_REPLAY (sa) && sa->seq_hi == ESP_SEQ_MAX)) return 1; sa->seq_hi++; } sa->seq++; } else { if (PREDICT_FALSE (ipsec_sa_is_set_USE_ANTI_REPLAY (sa) && sa->seq == ESP_SEQ_MAX)) return 1; sa->seq++; } return 0; } always_inline unsigned int hmac_calc (vlib_main_t * vm, ipsec_sa_t * sa, u8 * data, int data_len, u8 * signature) { vnet_crypto_op_t _op, *op = &_op; if (PREDICT_FALSE (sa->integ_op_id == 0)) return 0; vnet_crypto_op_init (op, sa->integ_op_id); op->key_index = sa->integ_key_index; op->src = data; op->len = data_len; op->digest = signature; op->digest_len = sa->integ_icv_size; if (ipsec_sa_is_set_USE_ESN (sa)) { u32 seq_hi = clib_host_to_net_u32 (sa->seq_hi); op->len += 4; clib_memcpy (data + data_len, &seq_hi, 4); } vnet_crypto_process_ops (vm, op, 1); return sa->integ_icv_size; } always_inline void esp_aad_fill (vnet_crypto_op_t * op, const esp_header_t * esp, const ipsec_sa_t * sa) { esp_aead_t *aad; aad = (esp_aead_t *) op->aad; aad->data[0] = esp->spi; if (ipsec_sa_is_set_USE_ESN (sa)) { /* SPI, seq-hi, seq-low */ aad->data[1] = clib_host_to_net_u32 (sa->seq_hi); aad->data[2] = esp->seq; op->aad_len = 12; } else { /* SPI, seq-low */ aad->data[1] = esp->seq; op->aad_len = 8; } } #endif /* __ESP_H__ */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */