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/* 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,
struct proto_accept_arg *arg);
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);
void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst);
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 */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| internal | Folder | 0755 |
|
|
| acompress.h | File | 8.9 KB | 0644 |
|
| aead.h | File | 18.44 KB | 0644 |
|
| aes.h | File | 2.5 KB | 0644 |
|
| akcipher.h | File | 12.92 KB | 0644 |
|
| algapi.h | File | 7.22 KB | 0644 |
|
| arc4.h | File | 484 B | 0644 |
|
| asym_tpm_subtype.h | File | 521 B | 0644 |
|
| authenc.h | File | 635 B | 0644 |
|
| b128ops.h | File | 2.26 KB | 0644 |
|
| blake2b.h | File | 1.57 KB | 0644 |
|
| blake2s.h | File | 2.72 KB | 0644 |
|
| blowfish.h | File | 415 B | 0644 |
|
| cast5.h | File | 590 B | 0644 |
|
| cast6.h | File | 607 B | 0644 |
|
| cast_common.h | File | 232 B | 0644 |
|
| chacha.h | File | 3.32 KB | 0644 |
|
| chacha20poly1305.h | File | 1.66 KB | 0644 |
|
| cryptd.h | File | 2 KB | 0644 |
|
| ctr.h | File | 1.42 KB | 0644 |
|
| curve25519.h | File | 2.02 KB | 0644 |
|
| des.h | File | 1.68 KB | 0644 |
|
| dh.h | File | 3.03 KB | 0644 |
|
| drbg.h | File | 8.99 KB | 0644 |
|
| ecc_curve.h | File | 1.31 KB | 0644 |
|
| ecdh.h | File | 2.43 KB | 0644 |
|
| engine.h | File | 3.78 KB | 0644 |
|
| gcm.h | File | 867 B | 0644 |
|
| gf128mul.h | File | 9.42 KB | 0644 |
|
| ghash.h | File | 388 B | 0644 |
|
| hash.h | File | 34.11 KB | 0644 |
|
| hash_info.h | File | 998 B | 0644 |
|
| hkdf.h | File | 524 B | 0644 |
|
| hmac.h | File | 173 B | 0644 |
|
| if_alg.h | File | 6.56 KB | 0644 |
|
| kpp.h | File | 9.97 KB | 0644 |
|
| md5.h | File | 497 B | 0644 |
|
| nhpoly1305.h | File | 2.18 KB | 0644 |
|
| null.h | File | 346 B | 0644 |
|
| padlock.h | File | 438 B | 0644 |
|
| pcrypt.h | File | 821 B | 0644 |
|
| pkcs7.h | File | 1.15 KB | 0644 |
|
| poly1305.h | File | 2.44 KB | 0644 |
|
| public_key.h | File | 3.63 KB | 0644 |
|
| rng.h | File | 6.59 KB | 0644 |
|
| scatterwalk.h | File | 3.89 KB | 0644 |
|
| serpent.h | File | 696 B | 0644 |
|
| sha1.h | File | 1.18 KB | 0644 |
|
| sha1_base.h | File | 2.45 KB | 0644 |
|
| sha2.h | File | 3.76 KB | 0644 |
|
| sha256_base.h | File | 2.56 KB | 0644 |
|
| sha3.h | File | 879 B | 0644 |
|
| sha512_base.h | File | 3.18 KB | 0644 |
|
| skcipher.h | File | 20.03 KB | 0644 |
|
| sm2.h | File | 749 B | 0644 |
|
| sm3.h | File | 897 B | 0644 |
|
| sm3_base.h | File | 2.55 KB | 0644 |
|
| sm4.h | File | 754 B | 0644 |
|
| streebog.h | File | 949 B | 0644 |
|
| twofish.h | File | 743 B | 0644 |
|
| xts.h | File | 978 B | 0644 |
|