2 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
37 #include <asm/byteorder.h>
38 #include <linux/types.h>
39 #include <linux/skmsg.h>
42 #define TLS_PAGE_ORDER (min_t(unsigned int, PAGE_ALLOC_COSTLY_ORDER, \
43 TLS_MAX_PAYLOAD_SIZE >> PAGE_SHIFT))
45 #define __TLS_INC_STATS(net, field) \
46 __SNMP_INC_STATS((net)->mib.tls_statistics, field)
47 #define TLS_INC_STATS(net, field) \
48 SNMP_INC_STATS((net)->mib.tls_statistics, field)
49 #define TLS_DEC_STATS(net, field) \
50 SNMP_DEC_STATS((net)->mib.tls_statistics, field)
52 /* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
53 * allocated or mapped for each TLS record. After encryption, the records are
54 * stores in a linked list.
57 struct list_head list;
61 struct sk_msg msg_plaintext;
62 struct sk_msg msg_encrypted;
64 /* AAD | msg_plaintext.sg.data | sg_tag */
65 struct scatterlist sg_aead_in[2];
66 /* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
67 struct scatterlist sg_aead_out[2];
70 struct scatterlist sg_content_type;
72 char aad_space[TLS_AAD_SPACE_SIZE];
73 u8 iv_data[MAX_IV_SIZE];
74 struct aead_request aead_req;
78 int __net_init tls_proc_init(struct net *net);
79 void __net_exit tls_proc_fini(struct net *net);
81 struct tls_context *tls_ctx_create(struct sock *sk);
82 void tls_ctx_free(struct sock *sk, struct tls_context *ctx);
83 void update_sk_prot(struct sock *sk, struct tls_context *ctx);
85 int wait_on_pending_writer(struct sock *sk, long *timeo);
86 int tls_sk_query(struct sock *sk, int optname, char __user *optval,
88 int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
90 void tls_err_abort(struct sock *sk, int err);
92 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
93 void tls_update_rx_zc_capable(struct tls_context *tls_ctx);
94 void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx);
95 void tls_sw_strparser_done(struct tls_context *tls_ctx);
96 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
97 int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
98 int offset, size_t size, int flags);
99 int tls_sw_sendpage(struct sock *sk, struct page *page,
100 int offset, size_t size, int flags);
101 void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
102 void tls_sw_release_resources_tx(struct sock *sk);
103 void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
104 void tls_sw_free_resources_rx(struct sock *sk);
105 void tls_sw_release_resources_rx(struct sock *sk);
106 void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
107 int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
108 int flags, int *addr_len);
109 bool tls_sw_sock_is_readable(struct sock *sk);
110 ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
111 struct pipe_inode_info *pipe,
112 size_t len, unsigned int flags);
114 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
115 int tls_device_sendpage(struct sock *sk, struct page *page,
116 int offset, size_t size, int flags);
117 int tls_tx_records(struct sock *sk, int flags);
119 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
120 void tls_device_write_space(struct sock *sk, struct tls_context *ctx);
122 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
123 unsigned char *record_type);
124 int decrypt_skb(struct sock *sk, struct scatterlist *sgout);
126 int tls_sw_fallback_init(struct sock *sk,
127 struct tls_offload_context_tx *offload_ctx,
128 struct tls_crypto_info *crypto_info);
130 int tls_strp_msg_cow(struct tls_sw_context_rx *ctx);
131 struct sk_buff *tls_strp_msg_detach(struct tls_sw_context_rx *ctx);
132 int tls_strp_msg_hold(struct sock *sk, struct sk_buff *skb,
133 struct sk_buff_head *dst);
135 static inline struct tls_msg *tls_msg(struct sk_buff *skb)
137 struct sk_skb_cb *scb = (struct sk_skb_cb *)skb->cb;
142 static inline struct sk_buff *tls_strp_msg(struct tls_sw_context_rx *ctx)
144 return ctx->recv_pkt;
147 static inline bool tls_strp_msg_ready(struct tls_sw_context_rx *ctx)
149 return ctx->recv_pkt;
152 #ifdef CONFIG_TLS_DEVICE
153 int tls_device_init(void);
154 void tls_device_cleanup(void);
155 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
156 void tls_device_free_resources_tx(struct sock *sk);
157 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
158 void tls_device_offload_cleanup_rx(struct sock *sk);
159 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
160 int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx);
162 static inline int tls_device_init(void) { return 0; }
163 static inline void tls_device_cleanup(void) {}
166 tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
171 static inline void tls_device_free_resources_tx(struct sock *sk) {}
174 tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
179 static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
181 tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
184 tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
190 int tls_push_sg(struct sock *sk, struct tls_context *ctx,
191 struct scatterlist *sg, u16 first_offset,
193 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
195 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
197 static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
199 return !!ctx->partially_sent_record;
202 static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
204 return tls_ctx->pending_open_record_frags;
207 static inline bool tls_bigint_increment(unsigned char *seq, int len)
211 for (i = len - 1; i >= 0; i--) {
220 static inline void tls_bigint_subtract(unsigned char *seq, int n)
225 BUILD_BUG_ON(TLS_MAX_REC_SEQ_SIZE != 8);
228 rcd_sn = be64_to_cpu(*p);
229 *p = cpu_to_be64(rcd_sn - n);
233 tls_advance_record_sn(struct sock *sk, struct tls_prot_info *prot,
234 struct cipher_context *ctx)
236 if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
237 tls_err_abort(sk, -EBADMSG);
239 if (prot->version != TLS_1_3_VERSION &&
240 prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
241 tls_bigint_increment(ctx->iv + prot->salt_size,
246 tls_xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *seq)
250 if (prot->version == TLS_1_3_VERSION ||
251 prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
252 for (i = 0; i < 8; i++)
258 tls_fill_prepend(struct tls_context *ctx, char *buf, size_t plaintext_len,
259 unsigned char record_type)
261 struct tls_prot_info *prot = &ctx->prot_info;
262 size_t pkt_len, iv_size = prot->iv_size;
264 pkt_len = plaintext_len + prot->tag_size;
265 if (prot->version != TLS_1_3_VERSION &&
266 prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) {
269 memcpy(buf + TLS_NONCE_OFFSET,
270 ctx->tx.iv + prot->salt_size, iv_size);
273 /* we cover nonce explicit here as well, so buf should be of
274 * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
276 buf[0] = prot->version == TLS_1_3_VERSION ?
277 TLS_RECORD_TYPE_DATA : record_type;
278 /* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
279 buf[1] = TLS_1_2_VERSION_MINOR;
280 buf[2] = TLS_1_2_VERSION_MAJOR;
281 /* we can use IV for nonce explicit according to spec */
282 buf[3] = pkt_len >> 8;
283 buf[4] = pkt_len & 0xFF;
287 void tls_make_aad(char *buf, size_t size, char *record_sequence,
288 unsigned char record_type, struct tls_prot_info *prot)
290 if (prot->version != TLS_1_3_VERSION) {
291 memcpy(buf, record_sequence, prot->rec_seq_size);
294 size += prot->tag_size;
297 buf[0] = prot->version == TLS_1_3_VERSION ?
298 TLS_RECORD_TYPE_DATA : record_type;
299 buf[1] = TLS_1_2_VERSION_MAJOR;
300 buf[2] = TLS_1_2_VERSION_MINOR;
302 buf[4] = size & 0xFF;