1 /*
2  * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  */
33 
34 #ifndef __MLX5E_IPSEC_H__
35 #define __MLX5E_IPSEC_H__
36 
37 #ifdef CONFIG_MLX5_EN_IPSEC
38 
39 #include <linux/mlx5/device.h>
40 #include <net/xfrm.h>
41 #include <linux/idr.h>
42 
43 #include "accel/ipsec.h"
44 
45 #define MLX5E_IPSEC_SADB_RX_BITS 10
46 #define MLX5E_IPSEC_ESN_SCOPE_MID 0x80000000L
47 
48 struct mlx5e_priv;
49 
50 struct mlx5e_ipsec_sw_stats {
51 	atomic64_t ipsec_rx_drop_sp_alloc;
52 	atomic64_t ipsec_rx_drop_sadb_miss;
53 	atomic64_t ipsec_rx_drop_syndrome;
54 	atomic64_t ipsec_tx_drop_bundle;
55 	atomic64_t ipsec_tx_drop_no_state;
56 	atomic64_t ipsec_tx_drop_not_ip;
57 	atomic64_t ipsec_tx_drop_trailer;
58 	atomic64_t ipsec_tx_drop_metadata;
59 };
60 
61 struct mlx5e_ipsec_stats {
62 	u64 ipsec_dec_in_packets;
63 	u64 ipsec_dec_out_packets;
64 	u64 ipsec_dec_bypass_packets;
65 	u64 ipsec_enc_in_packets;
66 	u64 ipsec_enc_out_packets;
67 	u64 ipsec_enc_bypass_packets;
68 	u64 ipsec_dec_drop_packets;
69 	u64 ipsec_dec_auth_fail_packets;
70 	u64 ipsec_enc_drop_packets;
71 	u64 ipsec_add_sa_success;
72 	u64 ipsec_add_sa_fail;
73 	u64 ipsec_del_sa_success;
74 	u64 ipsec_del_sa_fail;
75 	u64 ipsec_cmd_drop;
76 };
77 
78 struct mlx5e_accel_fs_esp;
79 struct mlx5e_ipsec_tx;
80 
81 struct mlx5e_ipsec {
82 	struct mlx5e_priv *en_priv;
83 	DECLARE_HASHTABLE(sadb_rx, MLX5E_IPSEC_SADB_RX_BITS);
84 	bool no_trailer;
85 	spinlock_t sadb_rx_lock; /* Protects sadb_rx and halloc */
86 	struct ida halloc;
87 	struct mlx5e_ipsec_sw_stats sw_stats;
88 	struct mlx5e_ipsec_stats stats;
89 	struct workqueue_struct *wq;
90 	struct mlx5e_accel_fs_esp *rx_fs;
91 	struct mlx5e_ipsec_tx *tx_fs;
92 };
93 
94 struct mlx5e_ipsec_esn_state {
95 	u32 esn;
96 	u8 trigger: 1;
97 	u8 overlap: 1;
98 };
99 
100 struct mlx5e_ipsec_rule {
101 	struct mlx5_flow_handle *rule;
102 	struct mlx5_modify_hdr *set_modify_hdr;
103 };
104 
105 struct mlx5e_ipsec_sa_entry {
106 	struct hlist_node hlist; /* Item in SADB_RX hashtable */
107 	struct mlx5e_ipsec_esn_state esn_state;
108 	unsigned int handle; /* Handle in SADB_RX */
109 	struct xfrm_state *x;
110 	struct mlx5e_ipsec *ipsec;
111 	struct mlx5_accel_esp_xfrm *xfrm;
112 	void *hw_context;
113 	void (*set_iv_op)(struct sk_buff *skb, struct xfrm_state *x,
114 			  struct xfrm_offload *xo);
115 	u32 ipsec_obj_id;
116 	struct mlx5e_ipsec_rule ipsec_rule;
117 };
118 
119 void mlx5e_ipsec_build_inverse_table(void);
120 int mlx5e_ipsec_init(struct mlx5e_priv *priv);
121 void mlx5e_ipsec_cleanup(struct mlx5e_priv *priv);
122 void mlx5e_ipsec_build_netdev(struct mlx5e_priv *priv);
123 
124 struct xfrm_state *mlx5e_ipsec_sadb_rx_lookup(struct mlx5e_ipsec *dev,
125 					      unsigned int handle);
126 
127 #else
128 
129 static inline void mlx5e_ipsec_build_inverse_table(void)
130 {
131 }
132 
133 static inline int mlx5e_ipsec_init(struct mlx5e_priv *priv)
134 {
135 	return 0;
136 }
137 
138 static inline void mlx5e_ipsec_cleanup(struct mlx5e_priv *priv)
139 {
140 }
141 
142 static inline void mlx5e_ipsec_build_netdev(struct mlx5e_priv *priv)
143 {
144 }
145 
146 #endif
147 
148 #endif	/* __MLX5E_IPSEC_H__ */
149