306 lines
6.8 KiB
C
306 lines
6.8 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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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/crypto.h>
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#include <linux/compiler.h>
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#include <linux/vmalloc.h>
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#include <crypto/algapi.h>
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#include <linux/cryptouser.h>
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#include <net/netlink.h>
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#include <linux/scatterlist.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/internal/acompress.h>
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#include <crypto/internal/scompress.h>
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#include "internal.h"
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struct scomp_scratch {
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spinlock_t lock;
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void *src;
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void *dst;
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};
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static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = {
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.lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock),
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};
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static const struct crypto_type crypto_scomp_type;
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static int scomp_scratch_users;
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static DEFINE_MUTEX(scomp_lock);
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#ifdef CONFIG_NET
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static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct crypto_report_comp rscomp;
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memset(&rscomp, 0, sizeof(rscomp));
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strscpy(rscomp.type, "scomp", sizeof(rscomp.type));
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return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
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sizeof(rscomp), &rscomp);
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}
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#else
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static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
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{
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return -ENOSYS;
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}
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#endif
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static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
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__maybe_unused;
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static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
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{
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seq_puts(m, "type : scomp\n");
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}
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static void crypto_scomp_free_scratches(void)
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{
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struct scomp_scratch *scratch;
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int i;
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for_each_possible_cpu(i) {
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scratch = per_cpu_ptr(&scomp_scratch, i);
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vfree(scratch->src);
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vfree(scratch->dst);
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scratch->src = NULL;
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scratch->dst = NULL;
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}
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}
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static int crypto_scomp_alloc_scratches(void)
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{
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struct scomp_scratch *scratch;
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int i;
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for_each_possible_cpu(i) {
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void *mem;
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scratch = per_cpu_ptr(&scomp_scratch, i);
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mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
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if (!mem)
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goto error;
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scratch->src = mem;
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mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
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if (!mem)
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goto error;
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scratch->dst = mem;
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}
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return 0;
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error:
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crypto_scomp_free_scratches();
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return -ENOMEM;
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}
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static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
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{
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int ret = 0;
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mutex_lock(&scomp_lock);
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if (!scomp_scratch_users++)
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ret = crypto_scomp_alloc_scratches();
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mutex_unlock(&scomp_lock);
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return ret;
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}
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static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
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{
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struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
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void **tfm_ctx = acomp_tfm_ctx(tfm);
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struct crypto_scomp *scomp = *tfm_ctx;
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void **ctx = acomp_request_ctx(req);
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struct scomp_scratch *scratch;
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int ret;
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if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE)
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return -EINVAL;
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if (req->dst && !req->dlen)
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return -EINVAL;
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if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
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req->dlen = SCOMP_SCRATCH_SIZE;
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scratch = raw_cpu_ptr(&scomp_scratch);
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spin_lock(&scratch->lock);
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scatterwalk_map_and_copy(scratch->src, req->src, 0, req->slen, 0);
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if (dir)
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ret = crypto_scomp_compress(scomp, scratch->src, req->slen,
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scratch->dst, &req->dlen, *ctx);
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else
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ret = crypto_scomp_decompress(scomp, scratch->src, req->slen,
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scratch->dst, &req->dlen, *ctx);
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if (!ret) {
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if (!req->dst) {
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req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
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if (!req->dst) {
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ret = -ENOMEM;
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goto out;
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}
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}
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scatterwalk_map_and_copy(scratch->dst, req->dst, 0, req->dlen,
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1);
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}
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out:
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spin_unlock(&scratch->lock);
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return ret;
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}
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static int scomp_acomp_compress(struct acomp_req *req)
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{
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return scomp_acomp_comp_decomp(req, 1);
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}
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static int scomp_acomp_decompress(struct acomp_req *req)
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{
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return scomp_acomp_comp_decomp(req, 0);
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}
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static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
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{
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struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
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crypto_free_scomp(*ctx);
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mutex_lock(&scomp_lock);
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if (!--scomp_scratch_users)
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crypto_scomp_free_scratches();
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mutex_unlock(&scomp_lock);
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}
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int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
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{
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struct crypto_alg *calg = tfm->__crt_alg;
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struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
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struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
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struct crypto_scomp *scomp;
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if (!crypto_mod_get(calg))
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return -EAGAIN;
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scomp = crypto_create_tfm(calg, &crypto_scomp_type);
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if (IS_ERR(scomp)) {
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crypto_mod_put(calg);
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return PTR_ERR(scomp);
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}
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*ctx = scomp;
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tfm->exit = crypto_exit_scomp_ops_async;
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crt->compress = scomp_acomp_compress;
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crt->decompress = scomp_acomp_decompress;
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crt->dst_free = sgl_free;
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crt->reqsize = sizeof(void *);
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return 0;
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}
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struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
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{
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struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
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struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
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struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
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struct crypto_scomp *scomp = *tfm_ctx;
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void *ctx;
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ctx = crypto_scomp_alloc_ctx(scomp);
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if (IS_ERR(ctx)) {
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kfree(req);
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return NULL;
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}
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*req->__ctx = ctx;
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return req;
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}
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void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
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{
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struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
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struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
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struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
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struct crypto_scomp *scomp = *tfm_ctx;
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void *ctx = *req->__ctx;
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if (ctx)
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crypto_scomp_free_ctx(scomp, ctx);
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}
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static const struct crypto_type crypto_scomp_type = {
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.extsize = crypto_alg_extsize,
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.init_tfm = crypto_scomp_init_tfm,
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#ifdef CONFIG_PROC_FS
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.show = crypto_scomp_show,
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#endif
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.report = crypto_scomp_report,
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_MASK,
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.type = CRYPTO_ALG_TYPE_SCOMPRESS,
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.tfmsize = offsetof(struct crypto_scomp, base),
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};
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int crypto_register_scomp(struct scomp_alg *alg)
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{
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struct crypto_alg *base = &alg->base;
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base->cra_type = &crypto_scomp_type;
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base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
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base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
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return crypto_register_alg(base);
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}
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EXPORT_SYMBOL_GPL(crypto_register_scomp);
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void crypto_unregister_scomp(struct scomp_alg *alg)
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{
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crypto_unregister_alg(&alg->base);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
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int crypto_register_scomps(struct scomp_alg *algs, int count)
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{
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int i, ret;
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for (i = 0; i < count; i++) {
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ret = crypto_register_scomp(&algs[i]);
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if (ret)
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goto err;
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}
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return 0;
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err:
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for (--i; i >= 0; --i)
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crypto_unregister_scomp(&algs[i]);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_register_scomps);
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void crypto_unregister_scomps(struct scomp_alg *algs, int count)
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{
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int i;
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for (i = count - 1; i >= 0; --i)
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crypto_unregister_scomp(&algs[i]);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_scomps);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Synchronous compression type");
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