| /* |
| * 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 __IPSEC_SPD_SA_H__ |
| #define __IPSEC_SPD_SA_H__ |
| |
| #include <vlib/vlib.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/fib/fib_node.h> |
| |
| #define IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE (64) |
| |
| #define foreach_ipsec_crypto_alg \ |
| _ (0, NONE, "none") \ |
| _ (1, AES_CBC_128, "aes-cbc-128") \ |
| _ (2, AES_CBC_192, "aes-cbc-192") \ |
| _ (3, AES_CBC_256, "aes-cbc-256") \ |
| _ (4, AES_CTR_128, "aes-ctr-128") \ |
| _ (5, AES_CTR_192, "aes-ctr-192") \ |
| _ (6, AES_CTR_256, "aes-ctr-256") \ |
| _ (7, AES_GCM_128, "aes-gcm-128") \ |
| _ (8, AES_GCM_192, "aes-gcm-192") \ |
| _ (9, AES_GCM_256, "aes-gcm-256") \ |
| _ (10, DES_CBC, "des-cbc") \ |
| _ (11, 3DES_CBC, "3des-cbc") |
| |
| typedef enum |
| { |
| #define _(v, f, s) IPSEC_CRYPTO_ALG_##f = v, |
| foreach_ipsec_crypto_alg |
| #undef _ |
| IPSEC_CRYPTO_N_ALG, |
| } ipsec_crypto_alg_t; |
| |
| #define IPSEC_CRYPTO_ALG_IS_GCM(_alg) \ |
| (((_alg == IPSEC_CRYPTO_ALG_AES_GCM_128) || \ |
| (_alg == IPSEC_CRYPTO_ALG_AES_GCM_192) || \ |
| (_alg == IPSEC_CRYPTO_ALG_AES_GCM_256))) |
| |
| #define foreach_ipsec_integ_alg \ |
| _ (0, NONE, "none") \ |
| _ (1, MD5_96, "md5-96") /* RFC2403 */ \ |
| _ (2, SHA1_96, "sha1-96") /* RFC2404 */ \ |
| _ (3, SHA_256_96, "sha-256-96") /* draft-ietf-ipsec-ciph-sha-256-00 */ \ |
| _ (4, SHA_256_128, "sha-256-128") /* RFC4868 */ \ |
| _ (5, SHA_384_192, "sha-384-192") /* RFC4868 */ \ |
| _ (6, SHA_512_256, "sha-512-256") /* RFC4868 */ |
| |
| typedef enum |
| { |
| #define _(v, f, s) IPSEC_INTEG_ALG_##f = v, |
| foreach_ipsec_integ_alg |
| #undef _ |
| IPSEC_INTEG_N_ALG, |
| } ipsec_integ_alg_t; |
| |
| typedef enum |
| { |
| IPSEC_PROTOCOL_AH = 0, |
| IPSEC_PROTOCOL_ESP = 1 |
| } ipsec_protocol_t; |
| |
| #define IPSEC_KEY_MAX_LEN 128 |
| typedef struct ipsec_key_t_ |
| { |
| u8 len; |
| u8 data[IPSEC_KEY_MAX_LEN]; |
| } ipsec_key_t; |
| |
| /* |
| * Enable extended sequence numbers |
| * Enable Anti-replay |
| * IPsec tunnel mode if non-zero, else transport mode |
| * IPsec tunnel mode is IPv6 if non-zero, |
| * else IPv4 tunnel only valid if is_tunnel is non-zero |
| * enable UDP encapsulation for NAT traversal |
| */ |
| #define foreach_ipsec_sa_flags \ |
| _ (0, NONE, "none") \ |
| _ (1, USE_ESN, "esn") \ |
| _ (2, USE_ANTI_REPLAY, "anti-replay") \ |
| _ (4, IS_TUNNEL, "tunnel") \ |
| _ (8, IS_TUNNEL_V6, "tunnel-v6") \ |
| _ (16, UDP_ENCAP, "udp-encap") \ |
| _ (32, IS_GRE, "GRE") \ |
| _ (64, IS_INBOUND, "inboud") \ |
| _ (128, IS_AEAD, "aead") \ |
| |
| typedef enum ipsec_sad_flags_t_ |
| { |
| #define _(v, f, s) IPSEC_SA_FLAG_##f = v, |
| foreach_ipsec_sa_flags |
| #undef _ |
| } __clib_packed ipsec_sa_flags_t; |
| |
| STATIC_ASSERT (sizeof (ipsec_sa_flags_t) == 1, "IPSEC SA flags > 1 byte"); |
| |
| typedef struct |
| { |
| CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); |
| |
| /* flags */ |
| ipsec_sa_flags_t flags; |
| |
| u8 crypto_iv_size; |
| u8 crypto_block_size; |
| u8 integ_icv_size; |
| u32 spi; |
| u32 seq; |
| u32 seq_hi; |
| u32 last_seq; |
| u32 last_seq_hi; |
| u64 replay_window; |
| dpo_id_t dpo; |
| |
| vnet_crypto_key_index_t crypto_key_index; |
| vnet_crypto_key_index_t integ_key_index; |
| vnet_crypto_op_id_t crypto_enc_op_id:16; |
| vnet_crypto_op_id_t crypto_dec_op_id:16; |
| vnet_crypto_op_id_t integ_op_id:16; |
| |
| /* data accessed by dataplane code should be above this comment */ |
| CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); |
| |
| union |
| { |
| ip4_header_t ip4_hdr; |
| ip6_header_t ip6_hdr; |
| }; |
| udp_header_t udp_hdr; |
| |
| |
| fib_node_t node; |
| u32 id; |
| u32 stat_index; |
| ipsec_protocol_t protocol; |
| |
| ipsec_crypto_alg_t crypto_alg; |
| ipsec_key_t crypto_key; |
| vnet_crypto_alg_t crypto_calg; |
| |
| ipsec_integ_alg_t integ_alg; |
| ipsec_key_t integ_key; |
| vnet_crypto_alg_t integ_calg; |
| |
| ip46_address_t tunnel_src_addr; |
| ip46_address_t tunnel_dst_addr; |
| |
| fib_node_index_t fib_entry_index; |
| u32 sibling; |
| |
| u32 tx_fib_index; |
| |
| /* Salt used in GCM modes - stored in network byte order */ |
| u32 salt; |
| u64 gcm_iv_counter; |
| } ipsec_sa_t; |
| |
| STATIC_ASSERT_OFFSET_OF (ipsec_sa_t, cacheline1, CLIB_CACHE_LINE_BYTES); |
| |
| #define _(a,v,s) \ |
| always_inline int \ |
| ipsec_sa_is_set_##v (const ipsec_sa_t *sa) { \ |
| return (sa->flags & IPSEC_SA_FLAG_##v); \ |
| } |
| foreach_ipsec_sa_flags |
| #undef _ |
| #define _(a,v,s) \ |
| always_inline int \ |
| ipsec_sa_set_##v (ipsec_sa_t *sa) { \ |
| return (sa->flags |= IPSEC_SA_FLAG_##v); \ |
| } |
| foreach_ipsec_sa_flags |
| #undef _ |
| /** |
| * @brief |
| * SA packet & bytes counters |
| */ |
| extern vlib_combined_counter_main_t ipsec_sa_counters; |
| |
| extern void ipsec_mk_key (ipsec_key_t * key, const u8 * data, u8 len); |
| |
| extern int ipsec_sa_add (u32 id, |
| u32 spi, |
| ipsec_protocol_t proto, |
| ipsec_crypto_alg_t crypto_alg, |
| const ipsec_key_t * ck, |
| ipsec_integ_alg_t integ_alg, |
| const ipsec_key_t * ik, |
| ipsec_sa_flags_t flags, |
| u32 tx_table_id, |
| u32 salt, |
| const ip46_address_t * tunnel_src_addr, |
| const ip46_address_t * tunnel_dst_addr, |
| u32 * sa_index); |
| extern u32 ipsec_sa_del (u32 id); |
| extern void ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, |
| ipsec_crypto_alg_t crypto_alg); |
| extern void ipsec_sa_set_integ_alg (ipsec_sa_t * sa, |
| ipsec_integ_alg_t integ_alg); |
| |
| extern u8 ipsec_is_sa_used (u32 sa_index); |
| extern u32 ipsec_get_sa_index_by_sa_id (u32 sa_id); |
| |
| typedef walk_rc_t (*ipsec_sa_walk_cb_t) (ipsec_sa_t * sa, void *ctx); |
| extern void ipsec_sa_walk (ipsec_sa_walk_cb_t cd, void *ctx); |
| |
| extern u8 *format_ipsec_crypto_alg (u8 * s, va_list * args); |
| extern u8 *format_ipsec_integ_alg (u8 * s, va_list * args); |
| extern u8 *format_ipsec_sa (u8 * s, va_list * args); |
| extern u8 *format_ipsec_key (u8 * s, va_list * args); |
| extern uword unformat_ipsec_crypto_alg (unformat_input_t * input, |
| va_list * args); |
| extern uword unformat_ipsec_integ_alg (unformat_input_t * input, |
| va_list * args); |
| extern uword unformat_ipsec_key (unformat_input_t * input, va_list * args); |
| |
| always_inline int |
| ipsec_sa_anti_replay_check (ipsec_sa_t * sa, u32 * seqp) |
| { |
| u32 seq, diff, tl, th; |
| if ((sa->flags & IPSEC_SA_FLAG_USE_ANTI_REPLAY) == 0) |
| return 0; |
| |
| seq = clib_net_to_host_u32 (*seqp); |
| |
| if ((sa->flags & IPSEC_SA_FLAG_USE_ESN) == 0) |
| { |
| |
| if (PREDICT_TRUE (seq > sa->last_seq)) |
| return 0; |
| |
| diff = sa->last_seq - seq; |
| |
| if (IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE > diff) |
| return (sa->replay_window & (1ULL << diff)) ? 1 : 0; |
| else |
| return 1; |
| |
| return 0; |
| } |
| |
| tl = sa->last_seq; |
| th = sa->last_seq_hi; |
| diff = tl - seq; |
| |
| if (PREDICT_TRUE (tl >= (IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE - 1))) |
| { |
| if (seq >= (tl - IPSEC_SA_ANTI_REPLAY_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 - IPSEC_SA_ANTI_REPLAY_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; |
| } |
| |
| always_inline void |
| ipsec_sa_anti_replay_advance (ipsec_sa_t * sa, u32 seqp) |
| { |
| u32 pos, seq; |
| if (PREDICT_TRUE (sa->flags & IPSEC_SA_FLAG_USE_ANTI_REPLAY) == 0) |
| return; |
| |
| seq = clib_host_to_net_u32 (seqp); |
| if (PREDICT_TRUE (sa->flags & IPSEC_SA_FLAG_USE_ESN)) |
| { |
| int wrap = sa->seq_hi - sa->last_seq_hi; |
| |
| if (wrap == 0 && seq > sa->last_seq) |
| { |
| pos = seq - sa->last_seq; |
| if (pos < IPSEC_SA_ANTI_REPLAY_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 < IPSEC_SA_ANTI_REPLAY_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); |
| } |
| } |
| else |
| { |
| if (seq > sa->last_seq) |
| { |
| pos = seq - sa->last_seq; |
| if (pos < IPSEC_SA_ANTI_REPLAY_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); |
| } |
| } |
| } |
| |
| #endif /* __IPSEC_SPD_SA_H__ */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |