X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fipsec%2Fipsec_sa.h;h=969b5d142eef32c999044efa22a35364bb0e3e7e;hb=f2922422d972644e67d1ca989e40cd0100ecb06d;hp=a6ade604b20351581b8717ef2670173e3c9fd534;hpb=b966e8bfdd3c63e2436ab6e5d250c8b1bf4dd102;p=vpp.git diff --git a/src/vnet/ipsec/ipsec_sa.h b/src/vnet/ipsec/ipsec_sa.h index a6ade604b20..969b5d142ee 100644 --- a/src/vnet/ipsec/ipsec_sa.h +++ b/src/vnet/ipsec/ipsec_sa.h @@ -19,6 +19,8 @@ #include #include +#define IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE (64) + #define foreach_ipsec_crypto_alg \ _ (0, NONE, "none") \ _ (1, AES_CBC_128, "aes-cbc-128") \ @@ -41,6 +43,11 @@ typedef enum 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 */ \ @@ -83,63 +90,102 @@ typedef struct ipsec_key_t_ */ #define foreach_ipsec_sa_flags \ _ (0, NONE, "none") \ - _ (1, USE_EXTENDED_SEQ_NUM, "esn") \ + _ (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 _ -} ipsec_sa_flags_t; +} __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; + + 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; + + dpo_id_t dpo[IPSEC_N_PROTOCOLS]; + + /* 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 spi; u32 stat_index; ipsec_protocol_t protocol; ipsec_crypto_alg_t crypto_alg; ipsec_key_t crypto_key; - u8 crypto_iv_size; - u8 crypto_block_size; - vnet_crypto_op_type_t crypto_enc_op_type; - vnet_crypto_op_type_t crypto_dec_op_type; + vnet_crypto_alg_t crypto_calg; ipsec_integ_alg_t integ_alg; ipsec_key_t integ_key; - vnet_crypto_op_type_t integ_op_type; - u8 integ_trunc_size; + vnet_crypto_alg_t integ_calg; - u8 use_esn; - u8 use_anti_replay; - - u8 is_tunnel; - u8 is_tunnel_ip6; - u8 udp_encap; ip46_address_t tunnel_src_addr; ip46_address_t tunnel_dst_addr; fib_node_index_t fib_entry_index; u32 sibling; - dpo_id_t dpo[IPSEC_N_PROTOCOLS]; u32 tx_fib_index; - u32 salt; - /* runtime */ - u32 seq; - u32 seq_hi; - u32 last_seq; - u32 last_seq_hi; - u64 replay_window; + /* 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 @@ -157,19 +203,17 @@ extern int ipsec_sa_add (u32 id, 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_stack (ipsec_sa_t * sa); 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 int ipsec_set_sa_key (u32 id, - const ipsec_key_t * ck, const ipsec_key_t * ik); 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); @@ -185,6 +229,132 @@ 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__ */ /*