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- /*
- * 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>
- #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)
- /* 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[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);
- int tls_sk_query(struct sock *sk, int optname, char __user *optval,
- int __user *optlen);
- int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
- unsigned int optlen);
- void tls_err_abort(struct sock *sk, int err);
- int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, 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);
- int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
- int offset, size_t size, int flags);
- int tls_sw_sendpage(struct sock *sk, struct page *page,
- int offset, size_t size, int flags);
- 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_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
- int tls_device_sendpage(struct sock *sk, struct page *page,
- int offset, size_t size, int flags);
- 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 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, struct tls_context *ctx);
- 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, struct tls_context *ctx)
- {
- 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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