3 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
38 #include <asm/byteorder.h>
39 #include <linux/types.h>
40 #include <linux/skmsg.h>
42 #include <net/tls_prot.h>
44 #define TLS_PAGE_ORDER (min_t(unsigned int, PAGE_ALLOC_COSTLY_ORDER, \
45 TLS_MAX_PAYLOAD_SIZE >> PAGE_SHIFT))
47 #define __TLS_INC_STATS(net, field) \
48 __SNMP_INC_STATS((net)->mib.tls_statistics, field)
49 #define TLS_INC_STATS(net, field) \
50 SNMP_INC_STATS((net)->mib.tls_statistics, field)
51 #define TLS_DEC_STATS(net, field) \
52 SNMP_DEC_STATS((net)->mib.tls_statistics, field)
54 /* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
55 * allocated or mapped for each TLS record. After encryption, the records are
56 * stores in a linked list.
59 struct list_head list;
63 struct sk_msg msg_plaintext;
64 struct sk_msg msg_encrypted;
66 /* AAD | msg_plaintext.sg.data | sg_tag */
67 struct scatterlist sg_aead_in[2];
68 /* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
69 struct scatterlist sg_aead_out[2];
72 struct scatterlist sg_content_type;
76 char aad_space[TLS_AAD_SPACE_SIZE];
77 u8 iv_data[MAX_IV_SIZE];
78 struct aead_request aead_req;
82 int __net_init tls_proc_init(struct net *net);
83 void __net_exit tls_proc_fini(struct net *net);
85 struct tls_context *tls_ctx_create(struct sock *sk);
86 void tls_ctx_free(struct sock *sk, struct tls_context *ctx);
87 void update_sk_prot(struct sock *sk, struct tls_context *ctx);
89 int wait_on_pending_writer(struct sock *sk, long *timeo);
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 void tls_sw_splice_eof(struct socket *sock);
98 void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
99 void tls_sw_release_resources_tx(struct sock *sk);
100 void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
101 void tls_sw_free_resources_rx(struct sock *sk);
102 void tls_sw_release_resources_rx(struct sock *sk);
103 void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
104 int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
105 int flags, int *addr_len);
106 bool tls_sw_sock_is_readable(struct sock *sk);
107 ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
108 struct pipe_inode_info *pipe,
109 size_t len, unsigned int flags);
110 int tls_sw_read_sock(struct sock *sk, read_descriptor_t *desc,
111 sk_read_actor_t read_actor);
113 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
114 void tls_device_splice_eof(struct socket *sock);
115 int tls_tx_records(struct sock *sk, int flags);
117 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
118 void tls_device_write_space(struct sock *sk, struct tls_context *ctx);
120 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
121 unsigned char *record_type);
122 int decrypt_skb(struct sock *sk, struct scatterlist *sgout);
124 int tls_sw_fallback_init(struct sock *sk,
125 struct tls_offload_context_tx *offload_ctx,
126 struct tls_crypto_info *crypto_info);
128 int tls_strp_dev_init(void);
129 void tls_strp_dev_exit(void);
131 void tls_strp_done(struct tls_strparser *strp);
132 void tls_strp_stop(struct tls_strparser *strp);
133 int tls_strp_init(struct tls_strparser *strp, struct sock *sk);
134 void tls_strp_data_ready(struct tls_strparser *strp);
136 void tls_strp_check_rcv(struct tls_strparser *strp);
137 void tls_strp_msg_done(struct tls_strparser *strp);
139 int tls_rx_msg_size(struct tls_strparser *strp, struct sk_buff *skb);
140 void tls_rx_msg_ready(struct tls_strparser *strp);
142 void tls_strp_msg_load(struct tls_strparser *strp, bool force_refresh);
143 int tls_strp_msg_cow(struct tls_sw_context_rx *ctx);
144 struct sk_buff *tls_strp_msg_detach(struct tls_sw_context_rx *ctx);
145 int tls_strp_msg_hold(struct tls_strparser *strp, struct sk_buff_head *dst);
147 static inline struct tls_msg *tls_msg(struct sk_buff *skb)
149 struct sk_skb_cb *scb = (struct sk_skb_cb *)skb->cb;
154 static inline struct sk_buff *tls_strp_msg(struct tls_sw_context_rx *ctx)
156 DEBUG_NET_WARN_ON_ONCE(!ctx->strp.msg_ready || !ctx->strp.anchor->len);
157 return ctx->strp.anchor;
160 static inline bool tls_strp_msg_ready(struct tls_sw_context_rx *ctx)
162 return ctx->strp.msg_ready;
165 static inline bool tls_strp_msg_mixed_decrypted(struct tls_sw_context_rx *ctx)
167 return ctx->strp.mixed_decrypted;
170 #ifdef CONFIG_TLS_DEVICE
171 int tls_device_init(void);
172 void tls_device_cleanup(void);
173 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
174 void tls_device_free_resources_tx(struct sock *sk);
175 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
176 void tls_device_offload_cleanup_rx(struct sock *sk);
177 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
178 int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx);
180 static inline int tls_device_init(void) { return 0; }
181 static inline void tls_device_cleanup(void) {}
184 tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
189 static inline void tls_device_free_resources_tx(struct sock *sk) {}
192 tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
197 static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
199 tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
202 tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
208 int tls_push_sg(struct sock *sk, struct tls_context *ctx,
209 struct scatterlist *sg, u16 first_offset,
211 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
213 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
215 static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
217 return !!ctx->partially_sent_record;
220 static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
222 return tls_ctx->pending_open_record_frags;
225 static inline bool tls_bigint_increment(unsigned char *seq, int len)
229 for (i = len - 1; i >= 0; i--) {
238 static inline void tls_bigint_subtract(unsigned char *seq, int n)
243 BUILD_BUG_ON(TLS_MAX_REC_SEQ_SIZE != 8);
246 rcd_sn = be64_to_cpu(*p);
247 *p = cpu_to_be64(rcd_sn - n);
251 tls_advance_record_sn(struct sock *sk, struct tls_prot_info *prot,
252 struct cipher_context *ctx)
254 if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
255 tls_err_abort(sk, -EBADMSG);
257 if (prot->version != TLS_1_3_VERSION &&
258 prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
259 tls_bigint_increment(ctx->iv + prot->salt_size,
264 tls_xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *seq)
268 if (prot->version == TLS_1_3_VERSION ||
269 prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
270 for (i = 0; i < 8; i++)
276 tls_fill_prepend(struct tls_context *ctx, char *buf, size_t plaintext_len,
277 unsigned char record_type)
279 struct tls_prot_info *prot = &ctx->prot_info;
280 size_t pkt_len, iv_size = prot->iv_size;
282 pkt_len = plaintext_len + prot->tag_size;
283 if (prot->version != TLS_1_3_VERSION &&
284 prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) {
287 memcpy(buf + TLS_NONCE_OFFSET,
288 ctx->tx.iv + prot->salt_size, iv_size);
291 /* we cover nonce explicit here as well, so buf should be of
292 * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
294 buf[0] = prot->version == TLS_1_3_VERSION ?
295 TLS_RECORD_TYPE_DATA : record_type;
296 /* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
297 buf[1] = TLS_1_2_VERSION_MINOR;
298 buf[2] = TLS_1_2_VERSION_MAJOR;
299 /* we can use IV for nonce explicit according to spec */
300 buf[3] = pkt_len >> 8;
301 buf[4] = pkt_len & 0xFF;
305 void tls_make_aad(char *buf, size_t size, char *record_sequence,
306 unsigned char record_type, struct tls_prot_info *prot)
308 if (prot->version != TLS_1_3_VERSION) {
309 memcpy(buf, record_sequence, prot->rec_seq_size);
312 size += prot->tag_size;
315 buf[0] = prot->version == TLS_1_3_VERSION ?
316 TLS_RECORD_TYPE_DATA : record_type;
317 buf[1] = TLS_1_2_VERSION_MAJOR;
318 buf[2] = TLS_1_2_VERSION_MINOR;
320 buf[4] = size & 0xFF;