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/*
* 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 __AH_H__
#define __AH_H__
#include <vnet/ip/ip.h>
#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/ipsec.api_enum.h>
typedef struct
{
unsigned char nexthdr;
unsigned char hdrlen;
unsigned short reserved;
unsigned int spi;
unsigned int seq_no;
unsigned char auth_data[0];
} ah_header_t;
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
ip4_header_t ip4;
ah_header_t ah;
}) ip4_and_ah_header_t;
/* *INDENT-ON* */
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
ip6_header_t ip6;
ah_header_t ah;
}) ip6_and_ah_header_t;
/* *INDENT-ON* */
always_inline u32
ah_encrypt_err_to_sa_err (u32 err)
{
switch (err)
{
case AH_ENCRYPT_ERROR_CRYPTO_ENGINE_ERROR:
return IPSEC_SA_ERROR_CRYPTO_ENGINE_ERROR;
case AH_ENCRYPT_ERROR_SEQ_CYCLED:
return IPSEC_SA_ERROR_SEQ_CYCLED;
}
return ~0;
}
always_inline u32
ah_decrypt_err_to_sa_err (u32 err)
{
switch (err)
{
case AH_DECRYPT_ERROR_DECRYPTION_FAILED:
return IPSEC_SA_ERROR_DECRYPTION_FAILED;
case AH_DECRYPT_ERROR_INTEG_ERROR:
return IPSEC_SA_ERROR_INTEG_ERROR;
case AH_DECRYPT_ERROR_NO_TAIL_SPACE:
return IPSEC_SA_ERROR_NO_TAIL_SPACE;
case AH_DECRYPT_ERROR_DROP_FRAGMENTS:
return IPSEC_SA_ERROR_DROP_FRAGMENTS;
case AH_DECRYPT_ERROR_REPLAY:
return IPSEC_SA_ERROR_REPLAY;
}
return ~0;
}
always_inline void
ah_encrypt_set_next_index (vlib_buffer_t *b, vlib_node_runtime_t *node,
u32 thread_index, u32 err, u16 index, u16 *nexts,
u16 drop_next, u32 sa_index)
{
ipsec_set_next_index (b, node, thread_index, err,
ah_encrypt_err_to_sa_err (err), index, nexts,
drop_next, sa_index);
}
always_inline void
ah_decrypt_set_next_index (vlib_buffer_t *b, vlib_node_runtime_t *node,
u32 thread_index, u32 err, u16 index, u16 *nexts,
u16 drop_next, u32 sa_index)
{
ipsec_set_next_index (b, node, thread_index, err,
ah_decrypt_err_to_sa_err (err), index, nexts,
drop_next, sa_index);
}
always_inline u8
ah_calc_icv_padding_len (u8 icv_size, int is_ipv6)
{
ASSERT (0 == is_ipv6 || 1 == is_ipv6);
const u8 req_multiple = 4 + 4 * is_ipv6; // 4 for ipv4, 8 for ipv6
const u8 total_size = sizeof (ah_header_t) + icv_size;
return (req_multiple - total_size % req_multiple) % req_multiple;
}
#endif /* __AH_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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