/*
* Copyright (c) 2016 Tom Herbert <[email protected]>
* Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
* Copyright (c) 2016-2017, Dave Watson <[email protected]>. 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_INT_H
#define _TLS_INT_H
#include <asm/byteorder.h>
#include <linux/types.h>
#include <linux/skmsg.h>
#include <net/tls.h>
#include <net/tls_prot.h>
#define TLS_PAGE_ORDER (min_t(unsigned int, PAGE_ALLOC_COSTLY_ORDER, \
TLS_MAX_PAYLOAD_SIZE >> PAGE_SHIFT))
#define __TLS_INC_STATS(net, field) \
__SNMP_INC_STATS((net)->mib.tls_statistics, field)
#define TLS_INC_STATS(net, field) \
SNMP_INC_STATS((net)->mib.tls_statistics, field)
#define TLS_DEC_STATS(net, field) \
SNMP_DEC_STATS((net)->mib.tls_statistics, field)
struct tls_cipher_desc {
unsigned int nonce;
unsigned int iv;
unsigned int key;
unsigned int salt;
unsigned int tag;
unsigned int rec_seq;
unsigned int iv_offset;
unsigned int key_offset;
unsigned int salt_offset;
unsigned int rec_seq_offset;
char *cipher_name;
bool offloadable;
size_t crypto_info;
};
#define TLS_CIPHER_MIN TLS_CIPHER_AES_GCM_128
#define TLS_CIPHER_MAX TLS_CIPHER_ARIA_GCM_256
extern const struct tls_cipher_desc tls_cipher_desc[TLS_CIPHER_MAX + 1 - TLS_CIPHER_MIN];
static inline const struct tls_cipher_desc *get_cipher_desc(u16 cipher_type)
{
if (cipher_type < TLS_CIPHER_MIN || cipher_type > TLS_CIPHER_MAX)
return NULL;
return &tls_cipher_desc[cipher_type - TLS_CIPHER_MIN];
}
static inline char *crypto_info_iv(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->iv_offset;
}
static inline char *crypto_info_key(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->key_offset;
}
static inline char *crypto_info_salt(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->salt_offset;
}
static inline char *crypto_info_rec_seq(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->rec_seq_offset;
}
/* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
* allocated or mapped for each TLS record. After encryption, the records are
* stores in a linked list.
*/
struct tls_rec {
struct list_head list;
int tx_ready;
int tx_flags;
struct sk_msg msg_plaintext;
struct sk_msg msg_encrypted;
/* AAD | msg_plaintext.sg.data | sg_tag */
struct scatterlist sg_aead_in[2];
/* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
struct scatterlist sg_aead_out[2];
char content_type;
struct scatterlist sg_content_type;
struct sock *sk;
char aad_space[TLS_AAD_SPACE_SIZE];
u8 iv_data[TLS_MAX_IV_SIZE];
struct aead_request aead_req;
u8 aead_req_ctx[];
};
int __net_init tls_proc_init(struct net *net);
void __net_exit tls_proc_fini(struct net *net);
struct tls_context *tls_ctx_create(struct sock *sk);
void tls_ctx_free(struct sock *sk, struct tls_context *ctx);
void update_sk_prot(struct sock *sk, struct tls_context *ctx);
int wait_on_pending_writer(struct sock *sk, long *timeo);
void tls_err_abort(struct sock *sk, int err);
int init_prot_info(struct tls_prot_info *prot,
const struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc);
int tls_set_sw_offload(struct sock *sk, int tx);
void tls_update_rx_zc_capable(struct tls_context *tls_ctx);
void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx);
void tls_sw_strparser_done(struct tls_context *tls_ctx);
int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
void tls_sw_splice_eof(struct socket *sock);
void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
void tls_sw_release_resources_tx(struct sock *sk);
void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
void tls_sw_free_resources_rx(struct sock *sk);
void tls_sw_release_resources_rx(struct sock *sk);
void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int flags, int *addr_len);
bool tls_sw_sock_is_readable(struct sock *sk);
ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags);
int tls_sw_read_sock(struct sock *sk, read_descriptor_t *desc,
sk_read_actor_t read_actor);
int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
void tls_device_splice_eof(struct socket *sock);
int tls_tx_records(struct sock *sk, int flags);
void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
void tls_device_write_space(struct sock *sk, struct tls_context *ctx);
int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
unsigned char *record_type);
int decrypt_skb(struct sock *sk, struct scatterlist *sgout);
int tls_sw_fallback_init(struct sock *sk,
struct tls_offload_context_tx *offload_ctx,
struct tls_crypto_info *crypto_info);
int tls_strp_dev_init(void);
void tls_strp_dev_exit(void);
void tls_strp_done(struct tls_strparser *strp);
void tls_strp_stop(struct tls_strparser *strp);
int tls_strp_init(struct tls_strparser *strp, struct sock *sk);
void tls_strp_data_ready(struct tls_strparser *strp);
void tls_strp_check_rcv(struct tls_strparser *strp);
void tls_strp_msg_done(struct tls_strparser *strp);
int tls_rx_msg_size(struct tls_strparser *strp, struct sk_buff *skb);
void tls_rx_msg_ready(struct tls_strparser *strp);
void tls_strp_msg_load(struct tls_strparser *strp, bool force_refresh);
int tls_strp_msg_cow(struct tls_sw_context_rx *ctx);
struct sk_buff *tls_strp_msg_detach(struct tls_sw_context_rx *ctx);
int tls_strp_msg_hold(struct tls_strparser *strp, struct sk_buff_head *dst);
static inline struct tls_msg *tls_msg(struct sk_buff *skb)
{
struct sk_skb_cb *scb = (struct sk_skb_cb *)skb->cb;
return &scb->tls;
}
static inline struct sk_buff *tls_strp_msg(struct tls_sw_context_rx *ctx)
{
DEBUG_NET_WARN_ON_ONCE(!ctx->strp.msg_ready || !ctx->strp.anchor->len);
return ctx->strp.anchor;
}
static inline bool tls_strp_msg_ready(struct tls_sw_context_rx *ctx)
{
return READ_ONCE(ctx->strp.msg_ready);
}
static inline bool tls_strp_msg_mixed_decrypted(struct tls_sw_context_rx *ctx)
{
return ctx->strp.mixed_decrypted;
}
#ifdef CONFIG_TLS_DEVICE
int tls_device_init(void);
void tls_device_cleanup(void);
int tls_set_device_offload(struct sock *sk);
void tls_device_free_resources_tx(struct sock *sk);
int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
void tls_device_offload_cleanup_rx(struct sock *sk);
void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx);
#else
static inline int tls_device_init(void) { return 0; }
static inline void tls_device_cleanup(void) {}
static inline int
tls_set_device_offload(struct sock *sk)
{
return -EOPNOTSUPP;
}
static inline void tls_device_free_resources_tx(struct sock *sk) {}
static inline int
tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
{
return -EOPNOTSUPP;
}
static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
static inline void
tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
static inline int
tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
{
return 0;
}
#endif
int tls_push_sg(struct sock *sk, struct tls_context *ctx,
struct scatterlist *sg, u16 first_offset,
int flags);
int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
int flags);
void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
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 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_bigint_subtract(unsigned char *seq, int n)
{
u64 rcd_sn;
__be64 *p;
BUILD_BUG_ON(TLS_MAX_REC_SEQ_SIZE != 8);
p = (__be64 *)seq;
rcd_sn = be64_to_cpu(*p);
*p = cpu_to_be64(rcd_sn - n);
}
static inline void
tls_advance_record_sn(struct sock *sk, struct tls_prot_info *prot,
struct cipher_context *ctx)
{
if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
tls_err_abort(sk, -EBADMSG);
if (prot->version != TLS_1_3_VERSION &&
prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
tls_bigint_increment(ctx->iv + prot->salt_size,
prot->iv_size);
}
static inline void
tls_xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *seq)
{
int i;
if (prot->version == TLS_1_3_VERSION ||
prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
for (i = 0; i < 8; i++)
iv[i + 4] ^= seq[i];
}
}
static inline void
tls_fill_prepend(struct tls_context *ctx, char *buf, size_t plaintext_len,
unsigned char record_type)
{
struct tls_prot_info *prot = &ctx->prot_info;
size_t pkt_len, iv_size = prot->iv_size;
pkt_len = plaintext_len + prot->tag_size;
if (prot->version != TLS_1_3_VERSION &&
prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) {
pkt_len += iv_size;
memcpy(buf + TLS_NONCE_OFFSET,
ctx->tx.iv + prot->salt_size, iv_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] = prot->version == TLS_1_3_VERSION ?
TLS_RECORD_TYPE_DATA : record_type;
/* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
buf[1] = TLS_1_2_VERSION_MINOR;
buf[2] = TLS_1_2_VERSION_MAJOR;
/* we can use IV for nonce explicit according to spec */
buf[3] = pkt_len >> 8;
buf[4] = pkt_len & 0xFF;
}
static inline
void tls_make_aad(char *buf, size_t size, char *record_sequence,
unsigned char record_type, struct tls_prot_info *prot)
{
if (prot->version != TLS_1_3_VERSION) {
memcpy(buf, record_sequence, prot->rec_seq_size);
buf += 8;
} else {
size += prot->tag_size;
}
buf[0] = prot->version == TLS_1_3_VERSION ?
TLS_RECORD_TYPE_DATA : record_type;
buf[1] = TLS_1_2_VERSION_MAJOR;
buf[2] = TLS_1_2_VERSION_MINOR;
buf[3] = size >> 8;
buf[4] = size & 0xFF;
}
#endif
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