/*
 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. 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_OFFLOAD_H
#define _TLS_OFFLOAD_H

#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/crypto.h>
#include <linux/socket.h>
#include <linux/tcp.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>

#include <net/net_namespace.h>
#include <net/tcp.h>
#include <net/strparser.h>
#include <crypto/aead.h>
#include <uapi/linux/tls.h>

struct tls_rec;

/* Maximum data size carried in a TLS record */
#define TLS_MAX_PAYLOAD_SIZE            ((size_t)1 << 14)
/* Minimum record size limit as per RFC8449 */
#define TLS_MIN_RECORD_SIZE_LIM         ((size_t)1 << 6)

#define TLS_HEADER_SIZE                 5
#define TLS_NONCE_OFFSET                TLS_HEADER_SIZE

#define TLS_CRYPTO_INFO_READY(info)     ((info)->cipher_type)

#define TLS_HANDSHAKE_KEYUPDATE         24      /* rfc8446 B.3: Key update */

#define TLS_AAD_SPACE_SIZE              13

#define TLS_MAX_IV_SIZE                 16
#define TLS_MAX_SALT_SIZE               4
#define TLS_TAG_SIZE                    16
#define TLS_MAX_REC_SEQ_SIZE            8
#define TLS_MAX_AAD_SIZE                TLS_AAD_SPACE_SIZE

/* For CCM mode, the full 16-bytes of IV is made of '4' fields of given sizes.
 *
 * IV[16] = b0[1] || implicit nonce[4] || explicit nonce[8] || length[3]
 *
 * The field 'length' is encoded in field 'b0' as '(length width - 1)'.
 * Hence b0 contains (3 - 1) = 2.
 */
#define TLS_AES_CCM_IV_B0_BYTE          2
#define TLS_SM4_CCM_IV_B0_BYTE          2

enum {
        TLS_BASE,
        TLS_SW,
        TLS_HW,
        TLS_HW_RECORD,
        TLS_NUM_CONFIG,
};

struct tx_work {
        struct delayed_work work;
        struct sock *sk;
};

struct tls_sw_context_tx {
        struct crypto_aead *aead_send;
        struct crypto_wait async_wait;
        struct tx_work tx_work;
        struct tls_rec *open_rec;
        struct list_head tx_list;
        atomic_t encrypt_pending;
        u8 async_capable:1;

#define BIT_TX_SCHEDULED        0
#define BIT_TX_CLOSING          1
        unsigned long tx_bitmask;
};

struct tls_strparser {
        struct sock *sk;

        u32 mark : 8;
        u32 stopped : 1;
        u32 copy_mode : 1;
        u32 mixed_decrypted : 1;

        bool msg_ready;

        struct strp_msg stm;

        struct sk_buff *anchor;
        struct work_struct work;
};

struct tls_sw_context_rx {
        struct crypto_aead *aead_recv;
        struct crypto_wait async_wait;
        struct sk_buff_head rx_list;    /* list of decrypted 'data' records */
        void (*saved_data_ready)(struct sock *sk);

        u8 reader_present;
        u8 async_capable:1;
        u8 zc_capable:1;
        u8 reader_contended:1;
        bool key_update_pending;

        struct tls_strparser strp;

        atomic_t decrypt_pending;
        struct sk_buff_head async_hold;
        struct wait_queue_head wq;
};

struct tls_record_info {
        struct list_head list;
        u32 end_seq;
        int len;
        int num_frags;
        skb_frag_t frags[MAX_SKB_FRAGS];
};

#define TLS_DRIVER_STATE_SIZE_TX        16
struct tls_offload_context_tx {
        struct crypto_aead *aead_send;
        spinlock_t lock;        /* protects records list */
        struct list_head records_list;
        struct tls_record_info *open_record;
        struct tls_record_info *retransmit_hint;
        u64 hint_record_sn;
        u64 unacked_record_sn;

        struct scatterlist sg_tx_data[MAX_SKB_FRAGS];
        void (*sk_destruct)(struct sock *sk);
        struct work_struct destruct_work;
        struct tls_context *ctx;
        /* The TLS layer reserves room for driver specific state
         * Currently the belief is that there is not enough
         * driver specific state to justify another layer of indirection
         */
        u8 driver_state[TLS_DRIVER_STATE_SIZE_TX] __aligned(8);
};

enum tls_context_flags {
        /* tls_device_down was called after the netdev went down, device state
         * was released, and kTLS works in software, even though rx_conf is
         * still TLS_HW (needed for transition).
         */
        TLS_RX_DEV_DEGRADED = 0,
        /* Unlike RX where resync is driven entirely by the core in TX only
         * the driver knows when things went out of sync, so we need the flag
         * to be atomic.
         */
        TLS_TX_SYNC_SCHED = 1,
        /* tls_dev_del was called for the RX side, device state was released,
         * but tls_ctx->netdev might still be kept, because TX-side driver
         * resources might not be released yet. Used to prevent the second
         * tls_dev_del call in tls_device_down if it happens simultaneously.
         */
        TLS_RX_DEV_CLOSED = 2,
};

struct cipher_context {
        char iv[TLS_MAX_IV_SIZE + TLS_MAX_SALT_SIZE];
        char rec_seq[TLS_MAX_REC_SEQ_SIZE];
};

union tls_crypto_context {
        struct tls_crypto_info info;
        union {
                struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
                struct tls12_crypto_info_aes_gcm_256 aes_gcm_256;
                struct tls12_crypto_info_chacha20_poly1305 chacha20_poly1305;
                struct tls12_crypto_info_sm4_gcm sm4_gcm;
                struct tls12_crypto_info_sm4_ccm sm4_ccm;
        };
};

struct tls_prot_info {
        u16 version;
        u16 cipher_type;
        u16 prepend_size;
        u16 tag_size;
        u16 overhead_size;
        u16 iv_size;
        u16 salt_size;
        u16 rec_seq_size;
        u16 aad_size;
        u16 tail_size;
};

struct tls_context {
        /* read-only cache line */
        struct tls_prot_info prot_info;

        u8 tx_conf:3;
        u8 rx_conf:3;
        u8 zerocopy_sendfile:1;
        u8 rx_no_pad:1;
        u16 tx_max_payload_len;

        int (*push_pending_record)(struct sock *sk, int flags);
        void (*sk_write_space)(struct sock *sk);

        void *priv_ctx_tx;
        void *priv_ctx_rx;

        struct net_device __rcu *netdev;

        /* rw cache line */
        struct cipher_context tx;
        struct cipher_context rx;

        struct scatterlist *partially_sent_record;
        u16 partially_sent_offset;

        bool splicing_pages;
        bool pending_open_record_frags;

        struct mutex tx_lock; /* protects partially_sent_* fields and
                               * per-type TX fields
                               */
        unsigned long flags;

        /* cache cold stuff */
        struct proto *sk_proto;
        struct sock *sk;

        void (*sk_destruct)(struct sock *sk);

        union tls_crypto_context crypto_send;
        union tls_crypto_context crypto_recv;

        struct list_head list;
        refcount_t refcount;
        struct rcu_head rcu;
};

enum tls_offload_ctx_dir {
        TLS_OFFLOAD_CTX_DIR_RX,
        TLS_OFFLOAD_CTX_DIR_TX,
};

struct tlsdev_ops {
        int (*tls_dev_add)(struct net_device *netdev, struct sock *sk,
                           enum tls_offload_ctx_dir direction,
                           struct tls_crypto_info *crypto_info,
                           u32 start_offload_tcp_sn);
        void (*tls_dev_del)(struct net_device *netdev,
                            struct tls_context *ctx,
                            enum tls_offload_ctx_dir direction);
        int (*tls_dev_resync)(struct net_device *netdev,
                              struct sock *sk, u32 seq, u8 *rcd_sn,
                              enum tls_offload_ctx_dir direction);
};

enum tls_offload_sync_type {
        TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ = 0,
        TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT = 1,
        TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC = 2,
};

#define TLS_DEVICE_RESYNC_NH_START_IVAL         2
#define TLS_DEVICE_RESYNC_NH_MAX_IVAL           128

#define TLS_DEVICE_RESYNC_ASYNC_LOGMAX          13
struct tls_offload_resync_async {
        atomic64_t req;
        u16 loglen;
        u16 rcd_delta;
        u32 log[TLS_DEVICE_RESYNC_ASYNC_LOGMAX];
};

#define TLS_DRIVER_STATE_SIZE_RX        8
struct tls_offload_context_rx {
        /* sw must be the first member of tls_offload_context_rx */
        struct tls_sw_context_rx sw;
        enum tls_offload_sync_type resync_type;
        /* this member is set regardless of resync_type, to avoid branches */
        u8 resync_nh_reset:1;
        /* CORE_NEXT_HINT-only member, but use the hole here */
        u8 resync_nh_do_now:1;
        union {
                /* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ */
                struct {
                        atomic64_t resync_req;
                };
                /* TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT */
                struct {
                        u32 decrypted_failed;
                        u32 decrypted_tgt;
                } resync_nh;
                /* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC */
                struct {
                        struct tls_offload_resync_async *resync_async;
                };
        };
        /* The TLS layer reserves room for driver specific state
         * Currently the belief is that there is not enough
         * driver specific state to justify another layer of indirection
         */
        u8 driver_state[TLS_DRIVER_STATE_SIZE_RX] __aligned(8);
};

struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
                                       u32 seq, u64 *p_record_sn);

static inline bool tls_record_is_start_marker(struct tls_record_info *rec)
{
        return rec->len == 0;
}

static inline u32 tls_record_start_seq(struct tls_record_info *rec)
{
        return rec->end_seq - rec->len;
}

struct sk_buff *
tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
                      struct sk_buff *skb);
struct sk_buff *
tls_validate_xmit_skb_sw(struct sock *sk, struct net_device *dev,
                         struct sk_buff *skb);

static inline bool tls_is_skb_tx_device_offloaded(const struct sk_buff *skb)
{
#ifdef CONFIG_TLS_DEVICE
        struct sock *sk = skb->sk;

        return sk && sk_fullsock(sk) &&
               (smp_load_acquire(&sk->sk_validate_xmit_skb) ==
               &tls_validate_xmit_skb);
#else
        return false;
#endif
}

static inline struct tls_context *tls_get_ctx(const struct sock *sk)
{
        const struct inet_connection_sock *icsk = inet_csk(sk);

        /* Use RCU on icsk_ulp_data only for sock diag code,
         * TLS data path doesn't need rcu_dereference().
         */
        return (__force void *)icsk->icsk_ulp_data;
}

static inline struct tls_sw_context_rx *tls_sw_ctx_rx(
                const struct tls_context *tls_ctx)
{
        return (struct tls_sw_context_rx *)tls_ctx->priv_ctx_rx;
}

static inline struct tls_sw_context_tx *tls_sw_ctx_tx(
                const struct tls_context *tls_ctx)
{
        return (struct tls_sw_context_tx *)tls_ctx->priv_ctx_tx;
}

static inline struct tls_offload_context_tx *
tls_offload_ctx_tx(const struct tls_context *tls_ctx)
{
        return (struct tls_offload_context_tx *)tls_ctx->priv_ctx_tx;
}

static inline bool tls_sw_has_ctx_tx(const struct sock *sk)
{
        struct tls_context *ctx;

        if (!sk_is_inet(sk) || !inet_test_bit(IS_ICSK, sk))
                return false;

        ctx = tls_get_ctx(sk);
        if (!ctx)
                return false;
        return !!tls_sw_ctx_tx(ctx);
}

static inline bool tls_sw_has_ctx_rx(const struct sock *sk)
{
        struct tls_context *ctx;

        if (!sk_is_inet(sk) || !inet_test_bit(IS_ICSK, sk))
                return false;

        ctx = tls_get_ctx(sk);
        if (!ctx)
                return false;
        return !!tls_sw_ctx_rx(ctx);
}

static inline struct tls_offload_context_rx *
tls_offload_ctx_rx(const struct tls_context *tls_ctx)
{
        return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx;
}

static inline void *__tls_driver_ctx(struct tls_context *tls_ctx,
                                     enum tls_offload_ctx_dir direction)
{
        if (direction == TLS_OFFLOAD_CTX_DIR_TX)
                return tls_offload_ctx_tx(tls_ctx)->driver_state;
        else
                return tls_offload_ctx_rx(tls_ctx)->driver_state;
}

static inline void *
tls_driver_ctx(const struct sock *sk, enum tls_offload_ctx_dir direction)
{
        return __tls_driver_ctx(tls_get_ctx(sk), direction);
}

#define RESYNC_REQ BIT(0)
#define RESYNC_REQ_ASYNC BIT(1)
/* The TLS context is valid until sk_destruct is called */
static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq)
{
        struct tls_context *tls_ctx = tls_get_ctx(sk);
        struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);

        atomic64_set(&rx_ctx->resync_req, ((u64)ntohl(seq) << 32) | RESYNC_REQ);
}

/* Log all TLS record header TCP sequences in [seq, seq+len] */
static inline void
tls_offload_rx_resync_async_request_start(struct tls_offload_resync_async *resync_async,
                                          __be32 seq, u16 len)
{
        atomic64_set(&resync_async->req, ((u64)ntohl(seq) << 32) |
                     ((u64)len << 16) | RESYNC_REQ | RESYNC_REQ_ASYNC);
        resync_async->loglen = 0;
        resync_async->rcd_delta = 0;
}

static inline void
tls_offload_rx_resync_async_request_end(struct tls_offload_resync_async *resync_async,
                                        __be32 seq)
{
        atomic64_set(&resync_async->req, ((u64)ntohl(seq) << 32) | RESYNC_REQ);
}

static inline void
tls_offload_rx_resync_async_request_cancel(struct tls_offload_resync_async *resync_async)
{
        atomic64_set(&resync_async->req, 0);
}

static inline void
tls_offload_rx_resync_set_type(struct sock *sk, enum tls_offload_sync_type type)
{
        struct tls_context *tls_ctx = tls_get_ctx(sk);

        tls_offload_ctx_rx(tls_ctx)->resync_type = type;
}

/* Driver's seq tracking has to be disabled until resync succeeded */
static inline bool tls_offload_tx_resync_pending(struct sock *sk)
{
        struct tls_context *tls_ctx = tls_get_ctx(sk);
        bool ret;

        ret = test_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
        smp_mb__after_atomic();
        return ret;
}

struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);

#ifdef CONFIG_TLS_DEVICE
void tls_device_sk_destruct(struct sock *sk);
void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq);

static inline bool tls_is_sk_rx_device_offloaded(struct sock *sk)
{
        if (!sk_fullsock(sk) ||
            smp_load_acquire(&sk->sk_destruct) != tls_device_sk_destruct)
                return false;
        return tls_get_ctx(sk)->rx_conf == TLS_HW;
}
#endif
#endif /* _TLS_OFFLOAD_H */