summaryrefslogtreecommitdiff
path: root/include/net/tls.h
blob: 936cfc5cab7df843439c493655460640c3d4f07b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef _TLS_OFFLOAD_H
#define _TLS_OFFLOAD_H

#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/socket.h>
#include <linux/tcp.h>
#include <net/tcp.h>

#include <uapi/linux/tls.h>


/* Maximum data size carried in a TLS record */
#define TLS_MAX_PAYLOAD_SIZE		((size_t)1 << 14)

#define TLS_HEADER_SIZE			5
#define TLS_NONCE_OFFSET		TLS_HEADER_SIZE

#define TLS_CRYPTO_INFO_READY(info)	((info)->cipher_type)

#define TLS_RECORD_TYPE_DATA		0x17

#define TLS_AAD_SPACE_SIZE		13

struct tls_sw_context {
	struct crypto_aead *aead_send;

	/* Sending context */
	char aad_space[TLS_AAD_SPACE_SIZE];

	unsigned int sg_plaintext_size;
	int sg_plaintext_num_elem;
	struct scatterlist sg_plaintext_data[MAX_SKB_FRAGS];

	unsigned int sg_encrypted_size;
	int sg_encrypted_num_elem;
	struct scatterlist sg_encrypted_data[MAX_SKB_FRAGS];

	/* AAD | sg_plaintext_data | sg_tag */
	struct scatterlist sg_aead_in[2];
	/* AAD | sg_encrypted_data (data contain overhead for hdr&iv&tag) */
	struct scatterlist sg_aead_out[2];
};

enum {
	TLS_PENDING_CLOSED_RECORD
};

struct tls_context {
	union {
		struct tls_crypto_info crypto_send;
		struct tls12_crypto_info_aes_gcm_128 crypto_send_aes_gcm_128;
	};

	void *priv_ctx;

	u8 tx_conf:2;

	u16 prepend_size;
	u16 tag_size;
	u16 overhead_size;
	u16 iv_size;
	char *iv;
	u16 rec_seq_size;
	char *rec_seq;

	struct scatterlist *partially_sent_record;
	u16 partially_sent_offset;
	unsigned long flags;

	u16 pending_open_record_frags;
	int (*push_pending_record)(struct sock *sk, int flags);

	void (*sk_write_space)(struct sock *sk);
	void (*sk_proto_close)(struct sock *sk, long timeout);

	int  (*setsockopt)(struct sock *sk, int level,
			   int optname, char __user *optval,
			   unsigned int optlen);
	int  (*getsockopt)(struct sock *sk, int level,
			   int optname, char __user *optval,
			   int __user *optlen);
};

int wait_on_pending_writer(struct sock *sk, long *timeo);
int tls_sk_query(struct sock *sk, int optname, char __user *optval,
		int __user *optlen);
int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
		  unsigned int optlen);


int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx);
int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
int tls_sw_sendpage(struct sock *sk, struct page *page,
		    int offset, size_t size, int flags);
void tls_sw_close(struct sock *sk, long timeout);
void tls_sw_free_tx_resources(struct sock *sk);

void tls_sk_destruct(struct sock *sk, struct tls_context *ctx);
void tls_icsk_clean_acked(struct sock *sk);

int tls_push_sg(struct sock *sk, struct tls_context *ctx,
		struct scatterlist *sg, u16 first_offset,
		int flags);
int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
				   int flags, long *timeo);

static inline bool tls_is_pending_closed_record(struct tls_context *ctx)
{
	return test_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
}

static inline int tls_complete_pending_work(struct sock *sk,
					    struct tls_context *ctx,
					    int flags, long *timeo)
{
	int rc = 0;

	if (unlikely(sk->sk_write_pending))
		rc = wait_on_pending_writer(sk, timeo);

	if (!rc && tls_is_pending_closed_record(ctx))
		rc = tls_push_pending_closed_record(sk, ctx, flags, timeo);

	return rc;
}

static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
{
	return !!ctx->partially_sent_record;
}

static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
{
	return tls_ctx->pending_open_record_frags;
}

static inline void tls_err_abort(struct sock *sk)
{
	sk->sk_err = -EBADMSG;
	sk->sk_error_report(sk);
}

static inline bool tls_bigint_increment(unsigned char *seq, int len)
{
	int i;

	for (i = len - 1; i >= 0; i--) {
		++seq[i];
		if (seq[i] != 0)
			break;
	}

	return (i == -1);
}

static inline void tls_advance_record_sn(struct sock *sk,
					 struct tls_context *ctx)
{
	if (tls_bigint_increment(ctx->rec_seq, ctx->rec_seq_size))
		tls_err_abort(sk);
	tls_bigint_increment(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
			     ctx->iv_size);
}

static inline void tls_fill_prepend(struct tls_context *ctx,
			     char *buf,
			     size_t plaintext_len,
			     unsigned char record_type)
{
	size_t pkt_len, iv_size = ctx->iv_size;

	pkt_len = plaintext_len + iv_size + ctx->tag_size;

	/* we cover nonce explicit here as well, so buf should be of
	 * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
	 */
	buf[0] = record_type;
	buf[1] = TLS_VERSION_MINOR(ctx->crypto_send.version);
	buf[2] = TLS_VERSION_MAJOR(ctx->crypto_send.version);
	/* we can use IV for nonce explicit according to spec */
	buf[3] = pkt_len >> 8;
	buf[4] = pkt_len & 0xFF;
	memcpy(buf + TLS_NONCE_OFFSET,
	       ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv_size);
}

static inline void tls_make_aad(char *buf,
				size_t size,
				char *record_sequence,
				int record_sequence_size,
				unsigned char record_type)
{
	memcpy(buf, record_sequence, record_sequence_size);

	buf[8] = record_type;
	buf[9] = TLS_1_2_VERSION_MAJOR;
	buf[10] = TLS_1_2_VERSION_MINOR;
	buf[11] = size >> 8;
	buf[12] = size & 0xFF;
}

static inline struct tls_context *tls_get_ctx(const struct sock *sk)
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	return icsk->icsk_ulp_data;
}

static inline struct tls_sw_context *tls_sw_ctx(
		const struct tls_context *tls_ctx)
{
	return (struct tls_sw_context *)tls_ctx->priv_ctx;
}

static inline struct tls_offload_context *tls_offload_ctx(
		const struct tls_context *tls_ctx)
{
	return (struct tls_offload_context *)tls_ctx->priv_ctx;
}

int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
		      unsigned char *record_type);

#endif /* _TLS_OFFLOAD_H */