516 lines
14 KiB
C
516 lines
14 KiB
C
/*
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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/crypto.h>
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#include <linux/socket.h>
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#include <linux/tcp.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/rcupdate.h>
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#include <net/net_namespace.h>
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#include <net/tcp.h>
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#include <net/strparser.h>
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#include <crypto/aead.h>
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#include <uapi/linux/tls.h>
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struct tls_rec;
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struct tls_cipher_size_desc {
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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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};
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extern const struct tls_cipher_size_desc tls_cipher_size_desc[];
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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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#define MAX_IV_SIZE 16
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#define TLS_TAG_SIZE 16
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#define TLS_MAX_REC_SEQ_SIZE 8
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#define TLS_MAX_AAD_SIZE TLS_AAD_SPACE_SIZE
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/* For CCM mode, the full 16-bytes of IV is made of '4' fields of given sizes.
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*
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* IV[16] = b0[1] || implicit nonce[4] || explicit nonce[8] || length[3]
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*
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* The field 'length' is encoded in field 'b0' as '(length width - 1)'.
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* Hence b0 contains (3 - 1) = 2.
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*/
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#define TLS_AES_CCM_IV_B0_BYTE 2
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#define TLS_SM4_CCM_IV_B0_BYTE 2
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enum {
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TLS_BASE,
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TLS_SW,
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TLS_HW,
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TLS_HW_RECORD,
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TLS_NUM_CONFIG,
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};
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struct tx_work {
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struct delayed_work work;
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struct sock *sk;
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};
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struct tls_sw_context_tx {
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struct crypto_aead *aead_send;
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struct crypto_wait async_wait;
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struct tx_work tx_work;
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struct tls_rec *open_rec;
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struct list_head tx_list;
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atomic_t encrypt_pending;
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/* protect crypto_wait with encrypt_pending */
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spinlock_t encrypt_compl_lock;
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int async_notify;
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u8 async_capable:1;
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#define BIT_TX_SCHEDULED 0
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#define BIT_TX_CLOSING 1
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unsigned long tx_bitmask;
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};
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struct tls_strparser {
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struct sock *sk;
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u32 mark : 8;
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u32 stopped : 1;
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u32 copy_mode : 1;
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u32 msg_ready : 1;
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struct strp_msg stm;
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struct sk_buff *anchor;
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struct work_struct work;
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};
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struct tls_sw_context_rx {
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struct crypto_aead *aead_recv;
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struct crypto_wait async_wait;
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struct sk_buff_head rx_list; /* list of decrypted 'data' records */
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void (*saved_data_ready)(struct sock *sk);
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u8 reader_present;
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u8 async_capable:1;
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u8 zc_capable:1;
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u8 reader_contended:1;
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struct tls_strparser strp;
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atomic_t decrypt_pending;
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/* protect crypto_wait with decrypt_pending*/
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spinlock_t decrypt_compl_lock;
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struct sk_buff_head async_hold;
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struct wait_queue_head wq;
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};
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struct tls_record_info {
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struct list_head list;
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u32 end_seq;
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int len;
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int num_frags;
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skb_frag_t frags[MAX_SKB_FRAGS];
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};
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struct tls_offload_context_tx {
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struct crypto_aead *aead_send;
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spinlock_t lock; /* protects records list */
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struct list_head records_list;
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struct tls_record_info *open_record;
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struct tls_record_info *retransmit_hint;
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u64 hint_record_sn;
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u64 unacked_record_sn;
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struct scatterlist sg_tx_data[MAX_SKB_FRAGS];
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void (*sk_destruct)(struct sock *sk);
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struct work_struct destruct_work;
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struct tls_context *ctx;
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u8 driver_state[] __aligned(8);
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/* The TLS layer reserves room for driver specific state
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* Currently the belief is that there is not enough
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* driver specific state to justify another layer of indirection
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*/
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#define TLS_DRIVER_STATE_SIZE_TX 16
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};
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#define TLS_OFFLOAD_CONTEXT_SIZE_TX \
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(sizeof(struct tls_offload_context_tx) + TLS_DRIVER_STATE_SIZE_TX)
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enum tls_context_flags {
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/* tls_device_down was called after the netdev went down, device state
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* was released, and kTLS works in software, even though rx_conf is
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* still TLS_HW (needed for transition).
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*/
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TLS_RX_DEV_DEGRADED = 0,
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/* Unlike RX where resync is driven entirely by the core in TX only
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* the driver knows when things went out of sync, so we need the flag
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* to be atomic.
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*/
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TLS_TX_SYNC_SCHED = 1,
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/* tls_dev_del was called for the RX side, device state was released,
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* but tls_ctx->netdev might still be kept, because TX-side driver
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* resources might not be released yet. Used to prevent the second
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* tls_dev_del call in tls_device_down if it happens simultaneously.
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*/
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TLS_RX_DEV_CLOSED = 2,
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};
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struct cipher_context {
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char *iv;
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char *rec_seq;
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};
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union tls_crypto_context {
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struct tls_crypto_info info;
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union {
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struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
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struct tls12_crypto_info_aes_gcm_256 aes_gcm_256;
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struct tls12_crypto_info_chacha20_poly1305 chacha20_poly1305;
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struct tls12_crypto_info_sm4_gcm sm4_gcm;
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struct tls12_crypto_info_sm4_ccm sm4_ccm;
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};
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};
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struct tls_prot_info {
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u16 version;
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u16 cipher_type;
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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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u16 salt_size;
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u16 rec_seq_size;
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u16 aad_size;
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u16 tail_size;
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};
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struct tls_context {
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/* read-only cache line */
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struct tls_prot_info prot_info;
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u8 tx_conf:3;
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u8 rx_conf:3;
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u8 zerocopy_sendfile:1;
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u8 rx_no_pad:1;
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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 *priv_ctx_tx;
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void *priv_ctx_rx;
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struct net_device __rcu *netdev;
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/* rw cache line */
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struct cipher_context tx;
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struct cipher_context rx;
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struct scatterlist *partially_sent_record;
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u16 partially_sent_offset;
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bool in_tcp_sendpages;
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bool pending_open_record_frags;
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struct mutex tx_lock; /* protects partially_sent_* fields and
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* per-type TX fields
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*/
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unsigned long flags;
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/* cache cold stuff */
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struct proto *sk_proto;
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struct sock *sk;
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void (*sk_destruct)(struct sock *sk);
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union tls_crypto_context crypto_send;
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union tls_crypto_context crypto_recv;
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struct list_head list;
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refcount_t refcount;
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struct rcu_head rcu;
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};
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enum tls_offload_ctx_dir {
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TLS_OFFLOAD_CTX_DIR_RX,
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TLS_OFFLOAD_CTX_DIR_TX,
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};
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struct tlsdev_ops {
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int (*tls_dev_add)(struct net_device *netdev, struct sock *sk,
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enum tls_offload_ctx_dir direction,
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struct tls_crypto_info *crypto_info,
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u32 start_offload_tcp_sn);
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void (*tls_dev_del)(struct net_device *netdev,
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struct tls_context *ctx,
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enum tls_offload_ctx_dir direction);
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int (*tls_dev_resync)(struct net_device *netdev,
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struct sock *sk, u32 seq, u8 *rcd_sn,
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enum tls_offload_ctx_dir direction);
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};
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enum tls_offload_sync_type {
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TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ = 0,
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TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT = 1,
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TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC = 2,
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};
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#define TLS_DEVICE_RESYNC_NH_START_IVAL 2
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#define TLS_DEVICE_RESYNC_NH_MAX_IVAL 128
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#define TLS_DEVICE_RESYNC_ASYNC_LOGMAX 13
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struct tls_offload_resync_async {
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atomic64_t req;
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u16 loglen;
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u16 rcd_delta;
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u32 log[TLS_DEVICE_RESYNC_ASYNC_LOGMAX];
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};
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struct tls_offload_context_rx {
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/* sw must be the first member of tls_offload_context_rx */
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struct tls_sw_context_rx sw;
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enum tls_offload_sync_type resync_type;
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/* this member is set regardless of resync_type, to avoid branches */
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u8 resync_nh_reset:1;
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/* CORE_NEXT_HINT-only member, but use the hole here */
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u8 resync_nh_do_now:1;
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union {
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/* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ */
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struct {
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atomic64_t resync_req;
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};
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/* TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT */
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struct {
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u32 decrypted_failed;
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u32 decrypted_tgt;
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} resync_nh;
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/* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC */
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struct {
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struct tls_offload_resync_async *resync_async;
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};
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};
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u8 driver_state[] __aligned(8);
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/* The TLS layer reserves room for driver specific state
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* Currently the belief is that there is not enough
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* driver specific state to justify another layer of indirection
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*/
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#define TLS_DRIVER_STATE_SIZE_RX 8
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};
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#define TLS_OFFLOAD_CONTEXT_SIZE_RX \
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(sizeof(struct tls_offload_context_rx) + TLS_DRIVER_STATE_SIZE_RX)
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struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
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u32 seq, u64 *p_record_sn);
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static inline bool tls_record_is_start_marker(struct tls_record_info *rec)
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{
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return rec->len == 0;
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}
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static inline u32 tls_record_start_seq(struct tls_record_info *rec)
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{
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return rec->end_seq - rec->len;
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}
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struct sk_buff *
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tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
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struct sk_buff *skb);
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struct sk_buff *
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tls_validate_xmit_skb_sw(struct sock *sk, struct net_device *dev,
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struct sk_buff *skb);
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static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk)
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{
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#ifdef CONFIG_SOCK_VALIDATE_XMIT
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return sk_fullsock(sk) &&
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(smp_load_acquire(&sk->sk_validate_xmit_skb) ==
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&tls_validate_xmit_skb);
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#else
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return false;
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#endif
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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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/* Use RCU on icsk_ulp_data only for sock diag code,
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* TLS data path doesn't need rcu_dereference().
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*/
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return (__force void *)icsk->icsk_ulp_data;
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}
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static inline struct tls_sw_context_rx *tls_sw_ctx_rx(
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const struct tls_context *tls_ctx)
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{
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return (struct tls_sw_context_rx *)tls_ctx->priv_ctx_rx;
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}
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static inline struct tls_sw_context_tx *tls_sw_ctx_tx(
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const struct tls_context *tls_ctx)
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{
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return (struct tls_sw_context_tx *)tls_ctx->priv_ctx_tx;
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}
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static inline struct tls_offload_context_tx *
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tls_offload_ctx_tx(const struct tls_context *tls_ctx)
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{
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return (struct tls_offload_context_tx *)tls_ctx->priv_ctx_tx;
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}
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static inline bool tls_sw_has_ctx_tx(const struct sock *sk)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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if (!ctx)
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return false;
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return !!tls_sw_ctx_tx(ctx);
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}
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static inline bool tls_sw_has_ctx_rx(const struct sock *sk)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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if (!ctx)
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return false;
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return !!tls_sw_ctx_rx(ctx);
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}
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static inline struct tls_offload_context_rx *
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tls_offload_ctx_rx(const struct tls_context *tls_ctx)
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{
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return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx;
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}
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static inline void *__tls_driver_ctx(struct tls_context *tls_ctx,
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enum tls_offload_ctx_dir direction)
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{
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if (direction == TLS_OFFLOAD_CTX_DIR_TX)
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return tls_offload_ctx_tx(tls_ctx)->driver_state;
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else
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return tls_offload_ctx_rx(tls_ctx)->driver_state;
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}
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static inline void *
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tls_driver_ctx(const struct sock *sk, enum tls_offload_ctx_dir direction)
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{
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return __tls_driver_ctx(tls_get_ctx(sk), direction);
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}
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#define RESYNC_REQ BIT(0)
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#define RESYNC_REQ_ASYNC BIT(1)
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/* The TLS context is valid until sk_destruct is called */
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static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
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atomic64_set(&rx_ctx->resync_req, ((u64)ntohl(seq) << 32) | RESYNC_REQ);
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}
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/* Log all TLS record header TCP sequences in [seq, seq+len] */
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static inline void
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tls_offload_rx_resync_async_request_start(struct sock *sk, __be32 seq, u16 len)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
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atomic64_set(&rx_ctx->resync_async->req, ((u64)ntohl(seq) << 32) |
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((u64)len << 16) | RESYNC_REQ | RESYNC_REQ_ASYNC);
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rx_ctx->resync_async->loglen = 0;
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rx_ctx->resync_async->rcd_delta = 0;
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}
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static inline void
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tls_offload_rx_resync_async_request_end(struct sock *sk, __be32 seq)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
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atomic64_set(&rx_ctx->resync_async->req,
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((u64)ntohl(seq) << 32) | RESYNC_REQ);
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}
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static inline void
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tls_offload_rx_resync_set_type(struct sock *sk, enum tls_offload_sync_type type)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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tls_offload_ctx_rx(tls_ctx)->resync_type = type;
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}
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/* Driver's seq tracking has to be disabled until resync succeeded */
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static inline bool tls_offload_tx_resync_pending(struct sock *sk)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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bool ret;
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ret = test_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
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smp_mb__after_atomic();
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return ret;
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}
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struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);
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#ifdef CONFIG_TLS_DEVICE
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void tls_device_sk_destruct(struct sock *sk);
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void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq);
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static inline bool tls_is_sk_rx_device_offloaded(struct sock *sk)
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{
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if (!sk_fullsock(sk) ||
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smp_load_acquire(&sk->sk_destruct) != tls_device_sk_destruct)
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return false;
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return tls_get_ctx(sk)->rx_conf == TLS_HW;
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}
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#endif
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#endif /* _TLS_OFFLOAD_H */
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