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acompress.h	8.86 KB	-rw-r--r--
aead.h	18.39 KB	-rw-r--r--
aes.h	2.5 KB	-rw-r--r--
akcipher.h	12.92 KB	-rw-r--r--
algapi.h	7.15 KB	-rw-r--r--
arc4.h	484 B	-rw-r--r--
asym_tpm_subtype.h	521 B	-rw-r--r--
authenc.h	635 B	-rw-r--r--
b128ops.h	2.41 KB	-rw-r--r--
blake2b.h	1.6 KB	-rw-r--r--
blake2s.h	2.72 KB	-rw-r--r--
blowfish.h	415 B	-rw-r--r--
cast5.h	590 B	-rw-r--r--
cast6.h	607 B	-rw-r--r--
cast_common.h	232 B	-rw-r--r--
chacha.h	3.13 KB	-rw-r--r--
chacha20poly1305.h	1.66 KB	-rw-r--r--
cryptd.h	2 KB	-rw-r--r--
ctr.h	1.42 KB	-rw-r--r--
curve25519.h	2.02 KB	-rw-r--r--
des.h	1.68 KB	-rw-r--r--
dh.h	2.51 KB	-rw-r--r--
drbg.h	8.95 KB	-rw-r--r--
ecc_curve.h	1.31 KB	-rw-r--r--
ecdh.h	2.43 KB	-rw-r--r--
engine.h	4.11 KB	-rw-r--r--
gcm.h	867 B	-rw-r--r--
gf128mul.h	9.42 KB	-rw-r--r--
ghash.h	388 B	-rw-r--r--
hash.h	34.04 KB	-rw-r--r--
hash_info.h	998 B	-rw-r--r--
hmac.h	173 B	-rw-r--r--
if_alg.h	6.58 KB	-rw-r--r--
kpp.h	9.91 KB	-rw-r--r--
md5.h	497 B	-rw-r--r--
nhpoly1305.h	2.18 KB	-rw-r--r--
null.h	346 B	-rw-r--r--
padlock.h	438 B	-rw-r--r--
pcrypt.h	815 B	-rw-r--r--
pkcs7.h	1.15 KB	-rw-r--r--
poly1305.h	2.44 KB	-rw-r--r--
public_key.h	2.38 KB	-rw-r--r--
rng.h	6.59 KB	-rw-r--r--
scatterwalk.h	2.94 KB	-rw-r--r--
serpent.h	696 B	-rw-r--r--
sha1.h	1.18 KB	-rw-r--r--
sha1_base.h	2.45 KB	-rw-r--r--
sha2.h	3.76 KB	-rw-r--r--
sha256_base.h	2.56 KB	-rw-r--r--
sha3.h	879 B	-rw-r--r--
sha512_base.h	3.18 KB	-rw-r--r--
skcipher.h	19.95 KB	-rw-r--r--
sm2.h	749 B	-rw-r--r--
sm3.h	897 B	-rw-r--r--
sm3_base.h	2.55 KB	-rw-r--r--
sm4.h	1.12 KB	-rw-r--r--
streebog.h	949 B	-rw-r--r--
twofish.h	743 B	-rw-r--r--
xts.h	1.1 KB	-rw-r--r--

Code Editor : if_alg.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * if_alg: User-space algorithm interface
 *
 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 */

#ifndef _CRYPTO_IF_ALG_H
#define _CRYPTO_IF_ALG_H

#include <linux/compiler.h>
#include <linux/completion.h>
#include <linux/if_alg.h>
#include <linux/scatterlist.h>
#include <linux/types.h>
#include <linux/atomic.h>
#include <net/sock.h>

#include <crypto/aead.h>
#include <crypto/skcipher.h>

#define ALG_MAX_PAGES			16

struct crypto_async_request;

struct alg_sock {
	/* struct sock must be the first member of struct alg_sock */
	struct sock sk;

struct sock *parent;

atomic_t refcnt;
	atomic_t nokey_refcnt;

const struct af_alg_type *type;
	void *private;
};

struct af_alg_control {
	struct af_alg_iv *iv;
	int op;
	unsigned int aead_assoclen;
};

struct af_alg_type {
	void *(*bind)(const char *name, u32 type, u32 mask);
	void (*release)(void *private);
	int (*setkey)(void *private, const u8 *key, unsigned int keylen);
	int (*setentropy)(void *private, sockptr_t entropy, unsigned int len);
	int (*accept)(void *private, struct sock *sk);
	int (*accept_nokey)(void *private, struct sock *sk);
	int (*setauthsize)(void *private, unsigned int authsize);

struct proto_ops *ops;
	struct proto_ops *ops_nokey;
	struct module *owner;
	char name[14];
};

struct af_alg_sgl {
	struct scatterlist sg[ALG_MAX_PAGES + 1];
	struct page *pages[ALG_MAX_PAGES];
	unsigned int npages;
};

/* TX SGL entry */
struct af_alg_tsgl {
	struct list_head list;
	unsigned int cur;		/* Last processed SG entry */
	struct scatterlist sg[];	/* Array of SGs forming the SGL */
};

#define MAX_SGL_ENTS ((4096 - sizeof(struct af_alg_tsgl)) / \
		      sizeof(struct scatterlist) - 1)

/* RX SGL entry */
struct af_alg_rsgl {
	struct af_alg_sgl sgl;
	struct list_head list;
	size_t sg_num_bytes;		/* Bytes of data in that SGL */
};

/**
 * struct af_alg_async_req - definition of crypto request
 * @iocb:		IOCB for AIO operations
 * @sk:			Socket the request is associated with
 * @first_rsgl:		First RX SG
 * @last_rsgl:		Pointer to last RX SG
 * @rsgl_list:		Track RX SGs
 * @tsgl:		Private, per request TX SGL of buffers to process
 * @tsgl_entries:	Number of entries in priv. TX SGL
 * @outlen:		Number of output bytes generated by crypto op
 * @areqlen:		Length of this data structure
 * @cra_u:		Cipher request
 */
struct af_alg_async_req {
	struct kiocb *iocb;
	struct sock *sk;

struct af_alg_rsgl first_rsgl;
	struct af_alg_rsgl *last_rsgl;
	struct list_head rsgl_list;

struct scatterlist *tsgl;
	unsigned int tsgl_entries;

unsigned int outlen;
	unsigned int areqlen;

union {
		struct aead_request aead_req;
		struct skcipher_request skcipher_req;
	} cra_u;

/* req ctx trails this struct */
};

/**
 * struct af_alg_ctx - definition of the crypto context
 *
 * The crypto context tracks the input data during the lifetime of an AF_ALG
 * socket.
 *
 * @tsgl_list:		Link to TX SGL
 * @iv:			IV for cipher operation
 * @aead_assoclen:	Length of AAD for AEAD cipher operations
 * @completion:		Work queue for synchronous operation
 * @used:		TX bytes sent to kernel. This variable is used to
 *			ensure that user space cannot cause the kernel
 *			to allocate too much memory in sendmsg operation.
 * @rcvused:		Total RX bytes to be filled by kernel. This variable
 *			is used to ensure user space cannot cause the kernel
 *			to allocate too much memory in a recvmsg operation.
 * @more:		More data to be expected from user space?
 * @merge:		Shall new data from user space be merged into existing
 *			SG?
 * @enc:		Cryptographic operation to be performed when
 *			recvmsg is invoked.
 * @init:		True if metadata has been sent.
 * @len:		Length of memory allocated for this data structure.
 */
struct af_alg_ctx {
	struct list_head tsgl_list;

void *iv;
	size_t aead_assoclen;

struct crypto_wait wait;

size_t used;
	atomic_t rcvused;

bool more;
	bool merge;
	bool enc;
	bool init;

unsigned int len;
};

int af_alg_register_type(const struct af_alg_type *type);
int af_alg_unregister_type(const struct af_alg_type *type);

int af_alg_release(struct socket *sock);
void af_alg_release_parent(struct sock *sk);
int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern);

int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len);
void af_alg_free_sg(struct af_alg_sgl *sgl);

static inline struct alg_sock *alg_sk(struct sock *sk)
{
	return (struct alg_sock *)sk;
}

/**
 * Size of available buffer for sending data from user space to kernel.
 *
 * @sk socket of connection to user space
 * @return number of bytes still available
 */
static inline int af_alg_sndbuf(struct sock *sk)
{
	struct alg_sock *ask = alg_sk(sk);
	struct af_alg_ctx *ctx = ask->private;

return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
			  ctx->used, 0);
}

/**
 * Can the send buffer still be written to?
 *
 * @sk socket of connection to user space
 * @return true => writable, false => not writable
 */
static inline bool af_alg_writable(struct sock *sk)
{
	return PAGE_SIZE <= af_alg_sndbuf(sk);
}

/**
 * Size of available buffer used by kernel for the RX user space operation.
 *
 * @sk socket of connection to user space
 * @return number of bytes still available
 */
static inline int af_alg_rcvbuf(struct sock *sk)
{
	struct alg_sock *ask = alg_sk(sk);
	struct af_alg_ctx *ctx = ask->private;

return max_t(int, max_t(int, sk->sk_rcvbuf & PAGE_MASK, PAGE_SIZE) -
		     atomic_read(&ctx->rcvused), 0);
}

/**
 * Can the RX buffer still be written to?
 *
 * @sk socket of connection to user space
 * @return true => writable, false => not writable
 */
static inline bool af_alg_readable(struct sock *sk)
{
	return PAGE_SIZE <= af_alg_rcvbuf(sk);
}

unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset);
void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst,
		      size_t dst_offset);
void af_alg_wmem_wakeup(struct sock *sk);
int af_alg_wait_for_data(struct sock *sk, unsigned flags, unsigned min);
int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
		   unsigned int ivsize);
ssize_t af_alg_sendpage(struct socket *sock, struct page *page,
			int offset, size_t size, int flags);
void af_alg_free_resources(struct af_alg_async_req *areq);
void af_alg_async_cb(struct crypto_async_request *_req, int err);
__poll_t af_alg_poll(struct file *file, struct socket *sock,
			 poll_table *wait);
struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk,
					   unsigned int areqlen);
int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags,
		    struct af_alg_async_req *areq, size_t maxsize,
		    size_t *outlen);

#endif	/* _CRYPTO_IF_ALG_H */

${this.title}

Code Editor : if_alg.h