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3c4d7559 DW |
1 | /* |
2 | * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved. | |
3 | * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved. | |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | */ | |
33 | ||
34 | #ifndef _TLS_OFFLOAD_H | |
35 | #define _TLS_OFFLOAD_H | |
36 | ||
37 | #include <linux/types.h> | |
b9f3eb49 DL |
38 | #include <asm/byteorder.h> |
39 | #include <linux/socket.h> | |
40 | #include <linux/tcp.h> | |
41 | #include <net/tcp.h> | |
3c4d7559 DW |
42 | |
43 | #include <uapi/linux/tls.h> | |
44 | ||
45 | ||
46 | /* Maximum data size carried in a TLS record */ | |
47 | #define TLS_MAX_PAYLOAD_SIZE ((size_t)1 << 14) | |
48 | ||
49 | #define TLS_HEADER_SIZE 5 | |
50 | #define TLS_NONCE_OFFSET TLS_HEADER_SIZE | |
51 | ||
52 | #define TLS_CRYPTO_INFO_READY(info) ((info)->cipher_type) | |
53 | ||
54 | #define TLS_RECORD_TYPE_DATA 0x17 | |
55 | ||
56 | #define TLS_AAD_SPACE_SIZE 13 | |
57 | ||
58 | struct tls_sw_context { | |
59 | struct crypto_aead *aead_send; | |
60 | ||
61 | /* Sending context */ | |
62 | char aad_space[TLS_AAD_SPACE_SIZE]; | |
63 | ||
64 | unsigned int sg_plaintext_size; | |
65 | int sg_plaintext_num_elem; | |
66 | struct scatterlist sg_plaintext_data[MAX_SKB_FRAGS]; | |
67 | ||
68 | unsigned int sg_encrypted_size; | |
69 | int sg_encrypted_num_elem; | |
70 | struct scatterlist sg_encrypted_data[MAX_SKB_FRAGS]; | |
71 | ||
72 | /* AAD | sg_plaintext_data | sg_tag */ | |
73 | struct scatterlist sg_aead_in[2]; | |
74 | /* AAD | sg_encrypted_data (data contain overhead for hdr&iv&tag) */ | |
75 | struct scatterlist sg_aead_out[2]; | |
76 | }; | |
77 | ||
78 | enum { | |
79 | TLS_PENDING_CLOSED_RECORD | |
80 | }; | |
81 | ||
82 | struct tls_context { | |
83 | union { | |
84 | struct tls_crypto_info crypto_send; | |
85 | struct tls12_crypto_info_aes_gcm_128 crypto_send_aes_gcm_128; | |
86 | }; | |
87 | ||
88 | void *priv_ctx; | |
89 | ||
6d88207f IL |
90 | u8 tx_conf:2; |
91 | ||
3c4d7559 DW |
92 | u16 prepend_size; |
93 | u16 tag_size; | |
94 | u16 overhead_size; | |
95 | u16 iv_size; | |
96 | char *iv; | |
97 | u16 rec_seq_size; | |
98 | char *rec_seq; | |
99 | ||
100 | struct scatterlist *partially_sent_record; | |
101 | u16 partially_sent_offset; | |
102 | unsigned long flags; | |
103 | ||
104 | u16 pending_open_record_frags; | |
105 | int (*push_pending_record)(struct sock *sk, int flags); | |
3c4d7559 DW |
106 | |
107 | void (*sk_write_space)(struct sock *sk); | |
108 | void (*sk_proto_close)(struct sock *sk, long timeout); | |
109 | ||
110 | int (*setsockopt)(struct sock *sk, int level, | |
111 | int optname, char __user *optval, | |
112 | unsigned int optlen); | |
113 | int (*getsockopt)(struct sock *sk, int level, | |
114 | int optname, char __user *optval, | |
115 | int __user *optlen); | |
116 | }; | |
117 | ||
118 | int wait_on_pending_writer(struct sock *sk, long *timeo); | |
119 | int tls_sk_query(struct sock *sk, int optname, char __user *optval, | |
120 | int __user *optlen); | |
121 | int tls_sk_attach(struct sock *sk, int optname, char __user *optval, | |
122 | unsigned int optlen); | |
123 | ||
124 | ||
125 | int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx); | |
126 | int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); | |
127 | int tls_sw_sendpage(struct sock *sk, struct page *page, | |
128 | int offset, size_t size, int flags); | |
129 | void tls_sw_close(struct sock *sk, long timeout); | |
ff45d820 | 130 | void tls_sw_free_tx_resources(struct sock *sk); |
3c4d7559 DW |
131 | |
132 | void tls_sk_destruct(struct sock *sk, struct tls_context *ctx); | |
133 | void tls_icsk_clean_acked(struct sock *sk); | |
134 | ||
135 | int tls_push_sg(struct sock *sk, struct tls_context *ctx, | |
136 | struct scatterlist *sg, u16 first_offset, | |
137 | int flags); | |
138 | int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx, | |
139 | int flags, long *timeo); | |
140 | ||
141 | static inline bool tls_is_pending_closed_record(struct tls_context *ctx) | |
142 | { | |
143 | return test_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags); | |
144 | } | |
145 | ||
146 | static inline int tls_complete_pending_work(struct sock *sk, | |
147 | struct tls_context *ctx, | |
148 | int flags, long *timeo) | |
149 | { | |
150 | int rc = 0; | |
151 | ||
152 | if (unlikely(sk->sk_write_pending)) | |
153 | rc = wait_on_pending_writer(sk, timeo); | |
154 | ||
155 | if (!rc && tls_is_pending_closed_record(ctx)) | |
156 | rc = tls_push_pending_closed_record(sk, ctx, flags, timeo); | |
157 | ||
158 | return rc; | |
159 | } | |
160 | ||
161 | static inline bool tls_is_partially_sent_record(struct tls_context *ctx) | |
162 | { | |
163 | return !!ctx->partially_sent_record; | |
164 | } | |
165 | ||
166 | static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx) | |
167 | { | |
168 | return tls_ctx->pending_open_record_frags; | |
169 | } | |
170 | ||
171 | static inline void tls_err_abort(struct sock *sk) | |
172 | { | |
30be8f8d | 173 | sk->sk_err = EBADMSG; |
3c4d7559 DW |
174 | sk->sk_error_report(sk); |
175 | } | |
176 | ||
177 | static inline bool tls_bigint_increment(unsigned char *seq, int len) | |
178 | { | |
179 | int i; | |
180 | ||
181 | for (i = len - 1; i >= 0; i--) { | |
182 | ++seq[i]; | |
183 | if (seq[i] != 0) | |
184 | break; | |
185 | } | |
186 | ||
187 | return (i == -1); | |
188 | } | |
189 | ||
190 | static inline void tls_advance_record_sn(struct sock *sk, | |
191 | struct tls_context *ctx) | |
192 | { | |
193 | if (tls_bigint_increment(ctx->rec_seq, ctx->rec_seq_size)) | |
194 | tls_err_abort(sk); | |
195 | tls_bigint_increment(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, | |
196 | ctx->iv_size); | |
197 | } | |
198 | ||
199 | static inline void tls_fill_prepend(struct tls_context *ctx, | |
200 | char *buf, | |
201 | size_t plaintext_len, | |
202 | unsigned char record_type) | |
203 | { | |
204 | size_t pkt_len, iv_size = ctx->iv_size; | |
205 | ||
206 | pkt_len = plaintext_len + iv_size + ctx->tag_size; | |
207 | ||
208 | /* we cover nonce explicit here as well, so buf should be of | |
209 | * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE | |
210 | */ | |
211 | buf[0] = record_type; | |
212 | buf[1] = TLS_VERSION_MINOR(ctx->crypto_send.version); | |
213 | buf[2] = TLS_VERSION_MAJOR(ctx->crypto_send.version); | |
214 | /* we can use IV for nonce explicit according to spec */ | |
215 | buf[3] = pkt_len >> 8; | |
216 | buf[4] = pkt_len & 0xFF; | |
217 | memcpy(buf + TLS_NONCE_OFFSET, | |
218 | ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv_size); | |
219 | } | |
220 | ||
213ef6e7 IL |
221 | static inline void tls_make_aad(char *buf, |
222 | size_t size, | |
223 | char *record_sequence, | |
224 | int record_sequence_size, | |
225 | unsigned char record_type) | |
226 | { | |
227 | memcpy(buf, record_sequence, record_sequence_size); | |
228 | ||
229 | buf[8] = record_type; | |
230 | buf[9] = TLS_1_2_VERSION_MAJOR; | |
231 | buf[10] = TLS_1_2_VERSION_MINOR; | |
232 | buf[11] = size >> 8; | |
233 | buf[12] = size & 0xFF; | |
234 | } | |
235 | ||
3c4d7559 DW |
236 | static inline struct tls_context *tls_get_ctx(const struct sock *sk) |
237 | { | |
238 | struct inet_connection_sock *icsk = inet_csk(sk); | |
239 | ||
240 | return icsk->icsk_ulp_data; | |
241 | } | |
242 | ||
243 | static inline struct tls_sw_context *tls_sw_ctx( | |
244 | const struct tls_context *tls_ctx) | |
245 | { | |
246 | return (struct tls_sw_context *)tls_ctx->priv_ctx; | |
247 | } | |
248 | ||
249 | static inline struct tls_offload_context *tls_offload_ctx( | |
250 | const struct tls_context *tls_ctx) | |
251 | { | |
252 | return (struct tls_offload_context *)tls_ctx->priv_ctx; | |
253 | } | |
254 | ||
255 | int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg, | |
256 | unsigned char *record_type); | |
257 | ||
258 | #endif /* _TLS_OFFLOAD_H */ |