259 lines
7.0 KiB
C
259 lines
7.0 KiB
C
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/*
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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_OFFLOAD_H
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#define _TLS_OFFLOAD_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include <linux/socket.h>
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#include <linux/tcp.h>
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#include <net/tcp.h>
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#include <uapi/linux/tls.h>
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/* Maximum data size carried in a TLS record */
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#define TLS_MAX_PAYLOAD_SIZE ((size_t)1 << 14)
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#define TLS_HEADER_SIZE 5
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#define TLS_NONCE_OFFSET TLS_HEADER_SIZE
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#define TLS_CRYPTO_INFO_READY(info) ((info)->cipher_type)
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#define TLS_RECORD_TYPE_DATA 0x17
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#define TLS_AAD_SPACE_SIZE 13
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struct tls_sw_context {
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struct crypto_aead *aead_send;
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/* Sending context */
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char aad_space[TLS_AAD_SPACE_SIZE];
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unsigned int sg_plaintext_size;
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int sg_plaintext_num_elem;
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struct scatterlist sg_plaintext_data[MAX_SKB_FRAGS];
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unsigned int sg_encrypted_size;
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int sg_encrypted_num_elem;
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struct scatterlist sg_encrypted_data[MAX_SKB_FRAGS];
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/* AAD | sg_plaintext_data | sg_tag */
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struct scatterlist sg_aead_in[2];
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/* AAD | sg_encrypted_data (data contain overhead for hdr&iv&tag) */
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struct scatterlist sg_aead_out[2];
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};
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enum {
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TLS_PENDING_CLOSED_RECORD
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};
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struct tls_context {
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union {
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struct tls_crypto_info crypto_send;
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struct tls12_crypto_info_aes_gcm_128 crypto_send_aes_gcm_128;
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};
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void *priv_ctx;
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u8 tx_conf:2;
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u16 prepend_size;
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u16 tag_size;
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u16 overhead_size;
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u16 iv_size;
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char *iv;
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u16 rec_seq_size;
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char *rec_seq;
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struct scatterlist *partially_sent_record;
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u16 partially_sent_offset;
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unsigned long flags;
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u16 pending_open_record_frags;
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int (*push_pending_record)(struct sock *sk, int flags);
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void (*sk_write_space)(struct sock *sk);
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void (*sk_proto_close)(struct sock *sk, long timeout);
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int (*setsockopt)(struct sock *sk, int level,
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int optname, char __user *optval,
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unsigned int optlen);
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int (*getsockopt)(struct sock *sk, int level,
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int optname, char __user *optval,
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int __user *optlen);
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};
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int wait_on_pending_writer(struct sock *sk, long *timeo);
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int tls_sk_query(struct sock *sk, int optname, char __user *optval,
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int __user *optlen);
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int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
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unsigned int optlen);
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int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx);
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int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
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int tls_sw_sendpage(struct sock *sk, struct page *page,
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int offset, size_t size, int flags);
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void tls_sw_close(struct sock *sk, long timeout);
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void tls_sw_free_tx_resources(struct sock *sk);
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void tls_sk_destruct(struct sock *sk, struct tls_context *ctx);
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void tls_icsk_clean_acked(struct sock *sk);
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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_pending_closed_record(struct sock *sk, struct tls_context *ctx,
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int flags, long *timeo);
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static inline bool tls_is_pending_closed_record(struct tls_context *ctx)
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{
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return test_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
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}
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static inline int tls_complete_pending_work(struct sock *sk,
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struct tls_context *ctx,
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int flags, long *timeo)
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{
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int rc = 0;
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if (unlikely(sk->sk_write_pending))
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rc = wait_on_pending_writer(sk, timeo);
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if (!rc && tls_is_pending_closed_record(ctx))
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rc = tls_push_pending_closed_record(sk, ctx, flags, timeo);
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return rc;
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}
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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 void tls_err_abort(struct sock *sk)
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{
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sk->sk_err = EBADMSG;
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sk->sk_error_report(sk);
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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_advance_record_sn(struct sock *sk,
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struct tls_context *ctx)
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{
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if (tls_bigint_increment(ctx->rec_seq, ctx->rec_seq_size))
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tls_err_abort(sk);
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tls_bigint_increment(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
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ctx->iv_size);
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}
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static inline void tls_fill_prepend(struct tls_context *ctx,
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char *buf,
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size_t plaintext_len,
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unsigned char record_type)
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{
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size_t pkt_len, iv_size = ctx->iv_size;
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pkt_len = plaintext_len + iv_size + ctx->tag_size;
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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] = record_type;
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buf[1] = TLS_VERSION_MINOR(ctx->crypto_send.version);
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buf[2] = TLS_VERSION_MAJOR(ctx->crypto_send.version);
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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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memcpy(buf + TLS_NONCE_OFFSET,
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ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv_size);
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}
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static inline void tls_make_aad(char *buf,
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size_t size,
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char *record_sequence,
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int record_sequence_size,
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unsigned char record_type)
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{
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memcpy(buf, record_sequence, record_sequence_size);
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buf[8] = record_type;
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buf[9] = TLS_1_2_VERSION_MAJOR;
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buf[10] = TLS_1_2_VERSION_MINOR;
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buf[11] = size >> 8;
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buf[12] = size & 0xFF;
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}
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static inline struct tls_context *tls_get_ctx(const struct sock *sk)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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return icsk->icsk_ulp_data;
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}
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static inline struct tls_sw_context *tls_sw_ctx(
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const struct tls_context *tls_ctx)
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{
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return (struct tls_sw_context *)tls_ctx->priv_ctx;
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}
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static inline struct tls_offload_context *tls_offload_ctx(
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const struct tls_context *tls_ctx)
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{
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return (struct tls_offload_context *)tls_ctx->priv_ctx;
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}
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int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
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unsigned char *record_type);
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#endif /* _TLS_OFFLOAD_H */
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