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![Sabrina Dubroca](/assets/img/avatar_default.png)
- add nonce, usually equal to iv_size but not for chacha - add offsets into the crypto_info for each field - add algorithm name - add offloadable flag Also add helpers to access each field of a crypto_info struct described by a tls_cipher_desc. Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Link: https://lore.kernel.org/r/39d5f476d63c171097764e8d38f6f158b7c109ae.1692977948.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski <kuba@kernel.org>
376 lines
12 KiB
C
376 lines
12 KiB
C
/*
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* Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
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* Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
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* Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _TLS_INT_H
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#define _TLS_INT_H
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#include <asm/byteorder.h>
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#include <linux/types.h>
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#include <linux/skmsg.h>
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#include <net/tls.h>
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#include <net/tls_prot.h>
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#define TLS_PAGE_ORDER (min_t(unsigned int, PAGE_ALLOC_COSTLY_ORDER, \
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TLS_MAX_PAYLOAD_SIZE >> PAGE_SHIFT))
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#define __TLS_INC_STATS(net, field) \
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__SNMP_INC_STATS((net)->mib.tls_statistics, field)
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#define TLS_INC_STATS(net, field) \
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SNMP_INC_STATS((net)->mib.tls_statistics, field)
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#define TLS_DEC_STATS(net, field) \
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SNMP_DEC_STATS((net)->mib.tls_statistics, field)
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struct tls_cipher_desc {
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unsigned int nonce;
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unsigned int iv;
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unsigned int key;
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unsigned int salt;
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unsigned int tag;
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unsigned int rec_seq;
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unsigned int iv_offset;
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unsigned int key_offset;
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unsigned int salt_offset;
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unsigned int rec_seq_offset;
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char *cipher_name;
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bool offloadable;
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size_t crypto_info;
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};
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#define TLS_CIPHER_MIN TLS_CIPHER_AES_GCM_128
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#define TLS_CIPHER_MAX TLS_CIPHER_ARIA_GCM_256
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extern const struct tls_cipher_desc tls_cipher_desc[TLS_CIPHER_MAX + 1 - TLS_CIPHER_MIN];
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static inline const struct tls_cipher_desc *get_cipher_desc(u16 cipher_type)
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{
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if (cipher_type < TLS_CIPHER_MIN || cipher_type > TLS_CIPHER_MAX)
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return NULL;
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return &tls_cipher_desc[cipher_type - TLS_CIPHER_MIN];
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}
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static inline char *crypto_info_iv(struct tls_crypto_info *crypto_info,
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const struct tls_cipher_desc *cipher_desc)
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{
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return (char *)crypto_info + cipher_desc->iv_offset;
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}
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static inline char *crypto_info_key(struct tls_crypto_info *crypto_info,
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const struct tls_cipher_desc *cipher_desc)
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{
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return (char *)crypto_info + cipher_desc->key_offset;
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}
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static inline char *crypto_info_salt(struct tls_crypto_info *crypto_info,
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const struct tls_cipher_desc *cipher_desc)
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{
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return (char *)crypto_info + cipher_desc->salt_offset;
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}
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static inline char *crypto_info_rec_seq(struct tls_crypto_info *crypto_info,
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const struct tls_cipher_desc *cipher_desc)
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{
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return (char *)crypto_info + cipher_desc->rec_seq_offset;
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}
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/* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
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* allocated or mapped for each TLS record. After encryption, the records are
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* stores in a linked list.
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*/
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struct tls_rec {
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struct list_head list;
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int tx_ready;
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int tx_flags;
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struct sk_msg msg_plaintext;
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struct sk_msg msg_encrypted;
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/* AAD | msg_plaintext.sg.data | sg_tag */
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struct scatterlist sg_aead_in[2];
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/* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
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struct scatterlist sg_aead_out[2];
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char content_type;
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struct scatterlist sg_content_type;
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struct sock *sk;
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char aad_space[TLS_AAD_SPACE_SIZE];
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u8 iv_data[MAX_IV_SIZE];
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struct aead_request aead_req;
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u8 aead_req_ctx[];
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};
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int __net_init tls_proc_init(struct net *net);
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void __net_exit tls_proc_fini(struct net *net);
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struct tls_context *tls_ctx_create(struct sock *sk);
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void tls_ctx_free(struct sock *sk, struct tls_context *ctx);
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void update_sk_prot(struct sock *sk, struct tls_context *ctx);
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int wait_on_pending_writer(struct sock *sk, long *timeo);
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void tls_err_abort(struct sock *sk, int err);
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int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
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void tls_update_rx_zc_capable(struct tls_context *tls_ctx);
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void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx);
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void tls_sw_strparser_done(struct tls_context *tls_ctx);
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int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
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void tls_sw_splice_eof(struct socket *sock);
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void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
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void tls_sw_release_resources_tx(struct sock *sk);
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void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
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void tls_sw_free_resources_rx(struct sock *sk);
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void tls_sw_release_resources_rx(struct sock *sk);
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void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
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int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
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int flags, int *addr_len);
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bool tls_sw_sock_is_readable(struct sock *sk);
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ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
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struct pipe_inode_info *pipe,
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size_t len, unsigned int flags);
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int tls_sw_read_sock(struct sock *sk, read_descriptor_t *desc,
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sk_read_actor_t read_actor);
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int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
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void tls_device_splice_eof(struct socket *sock);
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int tls_tx_records(struct sock *sk, int flags);
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void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
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void tls_device_write_space(struct sock *sk, struct tls_context *ctx);
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int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
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unsigned char *record_type);
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int decrypt_skb(struct sock *sk, struct scatterlist *sgout);
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int tls_sw_fallback_init(struct sock *sk,
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struct tls_offload_context_tx *offload_ctx,
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struct tls_crypto_info *crypto_info);
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int tls_strp_dev_init(void);
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void tls_strp_dev_exit(void);
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void tls_strp_done(struct tls_strparser *strp);
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void tls_strp_stop(struct tls_strparser *strp);
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int tls_strp_init(struct tls_strparser *strp, struct sock *sk);
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void tls_strp_data_ready(struct tls_strparser *strp);
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void tls_strp_check_rcv(struct tls_strparser *strp);
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void tls_strp_msg_done(struct tls_strparser *strp);
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int tls_rx_msg_size(struct tls_strparser *strp, struct sk_buff *skb);
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void tls_rx_msg_ready(struct tls_strparser *strp);
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void tls_strp_msg_load(struct tls_strparser *strp, bool force_refresh);
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int tls_strp_msg_cow(struct tls_sw_context_rx *ctx);
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struct sk_buff *tls_strp_msg_detach(struct tls_sw_context_rx *ctx);
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int tls_strp_msg_hold(struct tls_strparser *strp, struct sk_buff_head *dst);
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static inline struct tls_msg *tls_msg(struct sk_buff *skb)
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{
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struct sk_skb_cb *scb = (struct sk_skb_cb *)skb->cb;
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return &scb->tls;
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}
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static inline struct sk_buff *tls_strp_msg(struct tls_sw_context_rx *ctx)
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{
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DEBUG_NET_WARN_ON_ONCE(!ctx->strp.msg_ready || !ctx->strp.anchor->len);
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return ctx->strp.anchor;
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}
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static inline bool tls_strp_msg_ready(struct tls_sw_context_rx *ctx)
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{
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return ctx->strp.msg_ready;
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}
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static inline bool tls_strp_msg_mixed_decrypted(struct tls_sw_context_rx *ctx)
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{
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return ctx->strp.mixed_decrypted;
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}
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#ifdef CONFIG_TLS_DEVICE
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int tls_device_init(void);
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void tls_device_cleanup(void);
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int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
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void tls_device_free_resources_tx(struct sock *sk);
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int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
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void tls_device_offload_cleanup_rx(struct sock *sk);
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void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
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int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx);
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#else
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static inline int tls_device_init(void) { return 0; }
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static inline void tls_device_cleanup(void) {}
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static inline int
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tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
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{
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return -EOPNOTSUPP;
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}
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static inline void tls_device_free_resources_tx(struct sock *sk) {}
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static inline int
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tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
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{
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return -EOPNOTSUPP;
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}
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static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
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static inline void
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tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
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static inline int
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tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
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{
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return 0;
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}
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#endif
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int tls_push_sg(struct sock *sk, struct tls_context *ctx,
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struct scatterlist *sg, u16 first_offset,
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int flags);
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int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
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int flags);
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void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
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static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
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{
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return !!ctx->partially_sent_record;
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}
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static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
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{
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return tls_ctx->pending_open_record_frags;
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}
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static inline bool tls_bigint_increment(unsigned char *seq, int len)
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{
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int i;
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for (i = len - 1; i >= 0; i--) {
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++seq[i];
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if (seq[i] != 0)
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break;
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}
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return (i == -1);
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}
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static inline void tls_bigint_subtract(unsigned char *seq, int n)
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{
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u64 rcd_sn;
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__be64 *p;
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BUILD_BUG_ON(TLS_MAX_REC_SEQ_SIZE != 8);
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p = (__be64 *)seq;
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rcd_sn = be64_to_cpu(*p);
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*p = cpu_to_be64(rcd_sn - n);
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}
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static inline void
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tls_advance_record_sn(struct sock *sk, struct tls_prot_info *prot,
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struct cipher_context *ctx)
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{
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if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
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tls_err_abort(sk, -EBADMSG);
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if (prot->version != TLS_1_3_VERSION &&
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prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
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tls_bigint_increment(ctx->iv + prot->salt_size,
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prot->iv_size);
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}
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static inline void
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tls_xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *seq)
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{
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int i;
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if (prot->version == TLS_1_3_VERSION ||
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prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
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for (i = 0; i < 8; i++)
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iv[i + 4] ^= seq[i];
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}
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}
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static inline void
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tls_fill_prepend(struct tls_context *ctx, char *buf, size_t plaintext_len,
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unsigned char record_type)
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{
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struct tls_prot_info *prot = &ctx->prot_info;
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size_t pkt_len, iv_size = prot->iv_size;
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pkt_len = plaintext_len + prot->tag_size;
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if (prot->version != TLS_1_3_VERSION &&
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prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305) {
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pkt_len += iv_size;
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memcpy(buf + TLS_NONCE_OFFSET,
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ctx->tx.iv + prot->salt_size, iv_size);
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}
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/* we cover nonce explicit here as well, so buf should be of
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* size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
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*/
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buf[0] = prot->version == TLS_1_3_VERSION ?
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TLS_RECORD_TYPE_DATA : record_type;
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/* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
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buf[1] = TLS_1_2_VERSION_MINOR;
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buf[2] = TLS_1_2_VERSION_MAJOR;
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/* we can use IV for nonce explicit according to spec */
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buf[3] = pkt_len >> 8;
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buf[4] = pkt_len & 0xFF;
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}
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static inline
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void tls_make_aad(char *buf, size_t size, char *record_sequence,
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unsigned char record_type, struct tls_prot_info *prot)
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{
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if (prot->version != TLS_1_3_VERSION) {
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memcpy(buf, record_sequence, prot->rec_seq_size);
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buf += 8;
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} else {
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size += prot->tag_size;
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}
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buf[0] = prot->version == TLS_1_3_VERSION ?
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TLS_RECORD_TYPE_DATA : record_type;
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buf[1] = TLS_1_2_VERSION_MAJOR;
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buf[2] = TLS_1_2_VERSION_MINOR;
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buf[3] = size >> 8;
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buf[4] = size & 0xFF;
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}
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#endif
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