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c6d633a927
Some of the algorithm unregistration functions return -ENOENT when asked to unregister a non-registered algorithm, while others always return 0 or always return void. But no users check the return value, except for two of the bulk unregistration functions which print a message on error but still always return 0 to their caller, and crypto_del_alg() which calls crypto_unregister_instance() which always returns 0. Since unregistering a non-registered algorithm is always a kernel bug but there isn't anything callers should do to handle this situation at runtime, let's simplify things by making all the unregistration functions return void, and moving the error message into crypto_unregister_alg() and upgrading it to a WARN(). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Synchronous Compression operations
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*
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* Copyright 2015 LG Electronics Inc.
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* Copyright (c) 2016, Intel Corporation
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* Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
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*/
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#ifndef _CRYPTO_SCOMP_INT_H
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#define _CRYPTO_SCOMP_INT_H
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#include <linux/crypto.h>
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#define SCOMP_SCRATCH_SIZE 131072
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struct crypto_scomp {
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struct crypto_tfm base;
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};
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/**
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* struct scomp_alg - synchronous compression algorithm
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*
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* @alloc_ctx: Function allocates algorithm specific context
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* @free_ctx: Function frees context allocated with alloc_ctx
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* @compress: Function performs a compress operation
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* @decompress: Function performs a de-compress operation
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* @base: Common crypto API algorithm data structure
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*/
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struct scomp_alg {
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void *(*alloc_ctx)(struct crypto_scomp *tfm);
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void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
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int (*compress)(struct crypto_scomp *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen,
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void *ctx);
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int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen,
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void *ctx);
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struct crypto_alg base;
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};
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static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
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{
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return container_of(alg, struct scomp_alg, base);
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}
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static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
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{
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return container_of(tfm, struct crypto_scomp, base);
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}
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static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
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{
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return &tfm->base;
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}
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static inline void crypto_free_scomp(struct crypto_scomp *tfm)
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{
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crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
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}
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static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
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{
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return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
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}
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static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
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{
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return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
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}
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static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
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void *ctx)
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{
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return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
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}
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static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
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const u8 *src, unsigned int slen,
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u8 *dst, unsigned int *dlen, void *ctx)
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{
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return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
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}
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static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
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const u8 *src, unsigned int slen,
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u8 *dst, unsigned int *dlen,
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void *ctx)
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{
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return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
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ctx);
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}
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int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
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struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
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void crypto_acomp_scomp_free_ctx(struct acomp_req *req);
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/**
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* crypto_register_scomp() -- Register synchronous compression algorithm
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*
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* Function registers an implementation of a synchronous
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* compression algorithm
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*
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* @alg: algorithm definition
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*
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* Return: zero on success; error code in case of error
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*/
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int crypto_register_scomp(struct scomp_alg *alg);
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/**
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* crypto_unregister_scomp() -- Unregister synchronous compression algorithm
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*
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* Function unregisters an implementation of a synchronous
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* compression algorithm
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*
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* @alg: algorithm definition
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*/
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void crypto_unregister_scomp(struct scomp_alg *alg);
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int crypto_register_scomps(struct scomp_alg *algs, int count);
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void crypto_unregister_scomps(struct scomp_alg *algs, int count);
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#endif
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