X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fipsec%2Fipsec_sa.h;h=79971538646b5969b9cf0fc2de3ddac8d31d4fd9;hb=12989b538;hp=1cd215340f5f6c423e3f0e2a5e8ca1e069b72de1;hpb=d709cbcb1ef80633af657c5427608831e5bbd919;p=vpp.git diff --git a/src/vnet/ipsec/ipsec_sa.h b/src/vnet/ipsec/ipsec_sa.h index 1cd215340f5..79971538646 100644 --- a/src/vnet/ipsec/ipsec_sa.h +++ b/src/vnet/ipsec/ipsec_sa.h @@ -41,6 +41,11 @@ 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 */ \ @@ -64,8 +69,6 @@ typedef enum IPSEC_PROTOCOL_ESP = 1 } ipsec_protocol_t; -#define IPSEC_N_PROTOCOLS (IPSEC_PROTOCOL_ESP+1) - #define IPSEC_KEY_MAX_LEN 128 typedef struct ipsec_key_t_ { @@ -83,18 +86,21 @@ 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_PROTECT, "Protect") \ + _ (64, IS_INBOUND, "inbound") \ + _ (128, IS_AEAD, "aead") \ typedef enum ipsec_sad_flags_t_ { #define _(v, f, s) IPSEC_SA_FLAG_##f = v, foreach_ipsec_sa_flags #undef _ -} __attribute__ ((packed)) ipsec_sa_flags_t; +} __clib_packed ipsec_sa_flags_t; STATIC_ASSERT (sizeof (ipsec_sa_flags_t) == 1, "IPSEC SA flags > 1 byte"); @@ -107,19 +113,20 @@ typedef struct u8 crypto_iv_size; u8 crypto_block_size; - u8 integ_trunc_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_op_type_t crypto_enc_op_type; - vnet_crypto_op_type_t crypto_dec_op_type; - vnet_crypto_op_type_t integ_op_type; - - dpo_id_t dpo[IPSEC_N_PROTOCOLS]; + 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); @@ -131,7 +138,6 @@ typedef struct }; udp_header_t udp_hdr; - fib_node_t node; u32 id; u32 stat_index; @@ -139,9 +145,11 @@ typedef struct 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; @@ -150,9 +158,10 @@ typedef struct u32 sibling; u32 tx_fib_index; - u32 salt; - /* runtime */ + /* 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); @@ -171,6 +180,13 @@ foreach_ipsec_sa_flags } foreach_ipsec_sa_flags #undef _ +#define _(a,v,s) \ + always_inline int \ + ipsec_sa_unset_##v (ipsec_sa_t *sa) { \ + return (sa->flags &= ~IPSEC_SA_FLAG_##v); \ + } + foreach_ipsec_sa_flags +#undef _ /** * @brief * SA packet & bytes counters @@ -179,30 +195,29 @@ 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, - 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 int ipsec_sa_add_and_lock (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 index_t ipsec_sa_find_and_lock (u32 id); +extern int ipsec_sa_unlock_id (u32 id); +extern void ipsec_sa_unlock (index_t sai); +extern void ipsec_sa_lock (index_t sai); +extern void ipsec_sa_clear (index_t sai); 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); extern void ipsec_sa_walk (ipsec_sa_walk_cb_t cd, void *ctx); @@ -216,6 +231,211 @@ 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); +/* + * Anti Replay definitions + */ + +#define IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE (64) +#define IPSEC_SA_ANTI_REPLAY_WINDOW_MAX_INDEX (IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE-1) + +/* + * sequence number less than the lower bound are outside of the window + * From RFC4303 Appendix A: + * Bl = Tl - W + 1 + */ +#define IPSEC_SA_ANTI_REPLAY_WINDOW_LOWER_BOUND(_tl) (_tl - IPSEC_SA_ANTI_REPLAY_WINDOW_SIZE + 1) + +/* + * Anti replay check. + * inputs need to be in host byte order. + */ +always_inline int +ipsec_sa_anti_replay_check (ipsec_sa_t * sa, u32 seq) +{ + u32 diff, tl, th; + + if ((sa->flags & IPSEC_SA_FLAG_USE_ANTI_REPLAY) == 0) + return 0; + + if (!ipsec_sa_is_set_USE_ESN (sa)) + { + 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_MAX_INDEX))) + { + /* + * the last sequence number VPP recieved is more than one + * window size greater than zero. + * Case A from RFC4303 Appendix A. + */ + if (seq < IPSEC_SA_ANTI_REPLAY_WINDOW_LOWER_BOUND (tl)) + { + /* + * the received sequence number is lower than the lower bound + * of the window, this could mean either a replay packet or that + * the high sequence number has wrapped. if it decrypts corrently + * then it's the latter. + */ + sa->seq_hi = th + 1; + return 0; + } + else + { + /* + * the recieved sequence number greater than the low + * end of the window. + */ + sa->seq_hi = th; + if (seq <= tl) + /* + * The recieved seq number is within bounds of the window + * check if it's a duplicate + */ + return (sa->replay_window & (1ULL << diff)) ? 1 : 0; + else + /* + * The received sequence number is greater than the window + * upper bound. this packet will move the window along, assuming + * it decrypts correctly. + */ + return 0; + } + } + else + { + /* + * the last sequence number VPP recieved is within one window + * size of zero, i.e. 0 < TL < WINDOW_SIZE, the lower bound is thus a + * large sequence number. + * Note that the check below uses unsiged integer arthimetic, so the + * RHS will be a larger number. + * Case B from RFC4303 Appendix A. + */ + if (seq < IPSEC_SA_ANTI_REPLAY_WINDOW_LOWER_BOUND (tl)) + { + /* + * the sequence number is less than the lower bound. + */ + if (seq <= tl) + { + /* + * the packet is within the window upper bound. + * check for duplicates. + */ + sa->seq_hi = th; + return (sa->replay_window & (1ULL << diff)) ? 1 : 0; + } + else + { + /* + * the packet is less the window lower bound or greater than + * the higher bound, depending on how you look at it... + * We're assuming, given that the last sequence number received, + * TL < WINDOW_SIZE, that a largeer seq num is more likely to be + * a packet that moves the window forward, than a packet that has + * wrapped the high sequence again. If it were the latter then + * we've lost close to 2^32 packets. + */ + sa->seq_hi = th; + return 0; + } + } + else + { + /* + * the packet seq number is between the lower bound (a large nubmer) + * and MAX_SEQ_NUM. This is in the window since the window upper bound + * tl > 0. + * However, since TL is the other side of 0 to the received + * packet, the SA has moved on to a higher sequence number. + */ + sa->seq_hi = th - 1; + return (sa->replay_window & (1ULL << diff)) ? 1 : 0; + } + } + + return 0; +} + +/* + * Anti replay window advance + * inputs need to be in host byte order. + */ +always_inline void +ipsec_sa_anti_replay_advance (ipsec_sa_t * sa, u32 seq) +{ + u32 pos; + if (PREDICT_TRUE (sa->flags & IPSEC_SA_FLAG_USE_ANTI_REPLAY) == 0) + return; + + 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__ */ /*