zfs-builds-mm/zfs-0.8.2/module/icp/algs/modes/gcm.c

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2019-10-24 23:13:56 +02:00
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <modes/modes.h>
#include <sys/crypto/common.h>
#include <sys/crypto/icp.h>
#include <sys/crypto/impl.h>
#include <sys/byteorder.h>
#include <modes/gcm_impl.h>
#define GHASH(c, d, t, o) \
xor_block((uint8_t *)(d), (uint8_t *)(c)->gcm_ghash); \
(o)->mul((uint64_t *)(void *)(c)->gcm_ghash, (c)->gcm_H, \
(uint64_t *)(void *)(t));
/*
* Encrypt multiple blocks of data in GCM mode. Decrypt for GCM mode
* is done in another function.
*/
int
gcm_mode_encrypt_contiguous_blocks(gcm_ctx_t *ctx, char *data, size_t length,
crypto_data_t *out, size_t block_size,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*copy_block)(uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
gcm_impl_ops_t *gops;
size_t remainder = length;
size_t need = 0;
uint8_t *datap = (uint8_t *)data;
uint8_t *blockp;
uint8_t *lastp;
void *iov_or_mp;
offset_t offset;
uint8_t *out_data_1;
uint8_t *out_data_2;
size_t out_data_1_len;
uint64_t counter;
uint64_t counter_mask = ntohll(0x00000000ffffffffULL);
if (length + ctx->gcm_remainder_len < block_size) {
/* accumulate bytes here and return */
bcopy(datap,
(uint8_t *)ctx->gcm_remainder + ctx->gcm_remainder_len,
length);
ctx->gcm_remainder_len += length;
ctx->gcm_copy_to = datap;
return (CRYPTO_SUCCESS);
}
lastp = (uint8_t *)ctx->gcm_cb;
if (out != NULL)
crypto_init_ptrs(out, &iov_or_mp, &offset);
gops = gcm_impl_get_ops();
do {
/* Unprocessed data from last call. */
if (ctx->gcm_remainder_len > 0) {
need = block_size - ctx->gcm_remainder_len;
if (need > remainder)
return (CRYPTO_DATA_LEN_RANGE);
bcopy(datap, &((uint8_t *)ctx->gcm_remainder)
[ctx->gcm_remainder_len], need);
blockp = (uint8_t *)ctx->gcm_remainder;
} else {
blockp = datap;
}
/*
* Increment counter. Counter bits are confined
* to the bottom 32 bits of the counter block.
*/
counter = ntohll(ctx->gcm_cb[1] & counter_mask);
counter = htonll(counter + 1);
counter &= counter_mask;
ctx->gcm_cb[1] = (ctx->gcm_cb[1] & ~counter_mask) | counter;
encrypt_block(ctx->gcm_keysched, (uint8_t *)ctx->gcm_cb,
(uint8_t *)ctx->gcm_tmp);
xor_block(blockp, (uint8_t *)ctx->gcm_tmp);
lastp = (uint8_t *)ctx->gcm_tmp;
ctx->gcm_processed_data_len += block_size;
if (out == NULL) {
if (ctx->gcm_remainder_len > 0) {
bcopy(blockp, ctx->gcm_copy_to,
ctx->gcm_remainder_len);
bcopy(blockp + ctx->gcm_remainder_len, datap,
need);
}
} else {
crypto_get_ptrs(out, &iov_or_mp, &offset, &out_data_1,
&out_data_1_len, &out_data_2, block_size);
/* copy block to where it belongs */
if (out_data_1_len == block_size) {
copy_block(lastp, out_data_1);
} else {
bcopy(lastp, out_data_1, out_data_1_len);
if (out_data_2 != NULL) {
bcopy(lastp + out_data_1_len,
out_data_2,
block_size - out_data_1_len);
}
}
/* update offset */
out->cd_offset += block_size;
}
/* add ciphertext to the hash */
GHASH(ctx, ctx->gcm_tmp, ctx->gcm_ghash, gops);
/* Update pointer to next block of data to be processed. */
if (ctx->gcm_remainder_len != 0) {
datap += need;
ctx->gcm_remainder_len = 0;
} else {
datap += block_size;
}
remainder = (size_t)&data[length] - (size_t)datap;
/* Incomplete last block. */
if (remainder > 0 && remainder < block_size) {
bcopy(datap, ctx->gcm_remainder, remainder);
ctx->gcm_remainder_len = remainder;
ctx->gcm_copy_to = datap;
goto out;
}
ctx->gcm_copy_to = NULL;
} while (remainder > 0);
out:
return (CRYPTO_SUCCESS);
}
/* ARGSUSED */
int
gcm_encrypt_final(gcm_ctx_t *ctx, crypto_data_t *out, size_t block_size,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*copy_block)(uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
gcm_impl_ops_t *gops;
uint64_t counter_mask = ntohll(0x00000000ffffffffULL);
uint8_t *ghash, *macp = NULL;
int i, rv;
if (out->cd_length <
(ctx->gcm_remainder_len + ctx->gcm_tag_len)) {
return (CRYPTO_DATA_LEN_RANGE);
}
gops = gcm_impl_get_ops();
ghash = (uint8_t *)ctx->gcm_ghash;
if (ctx->gcm_remainder_len > 0) {
uint64_t counter;
uint8_t *tmpp = (uint8_t *)ctx->gcm_tmp;
/*
* Here is where we deal with data that is not a
* multiple of the block size.
*/
/*
* Increment counter.
*/
counter = ntohll(ctx->gcm_cb[1] & counter_mask);
counter = htonll(counter + 1);
counter &= counter_mask;
ctx->gcm_cb[1] = (ctx->gcm_cb[1] & ~counter_mask) | counter;
encrypt_block(ctx->gcm_keysched, (uint8_t *)ctx->gcm_cb,
(uint8_t *)ctx->gcm_tmp);
macp = (uint8_t *)ctx->gcm_remainder;
bzero(macp + ctx->gcm_remainder_len,
block_size - ctx->gcm_remainder_len);
/* XOR with counter block */
for (i = 0; i < ctx->gcm_remainder_len; i++) {
macp[i] ^= tmpp[i];
}
/* add ciphertext to the hash */
GHASH(ctx, macp, ghash, gops);
ctx->gcm_processed_data_len += ctx->gcm_remainder_len;
}
ctx->gcm_len_a_len_c[1] =
htonll(CRYPTO_BYTES2BITS(ctx->gcm_processed_data_len));
GHASH(ctx, ctx->gcm_len_a_len_c, ghash, gops);
encrypt_block(ctx->gcm_keysched, (uint8_t *)ctx->gcm_J0,
(uint8_t *)ctx->gcm_J0);
xor_block((uint8_t *)ctx->gcm_J0, ghash);
if (ctx->gcm_remainder_len > 0) {
rv = crypto_put_output_data(macp, out, ctx->gcm_remainder_len);
if (rv != CRYPTO_SUCCESS)
return (rv);
}
out->cd_offset += ctx->gcm_remainder_len;
ctx->gcm_remainder_len = 0;
rv = crypto_put_output_data(ghash, out, ctx->gcm_tag_len);
if (rv != CRYPTO_SUCCESS)
return (rv);
out->cd_offset += ctx->gcm_tag_len;
return (CRYPTO_SUCCESS);
}
/*
* This will only deal with decrypting the last block of the input that
* might not be a multiple of block length.
*/
static void
gcm_decrypt_incomplete_block(gcm_ctx_t *ctx, size_t block_size, size_t index,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
uint8_t *datap, *outp, *counterp;
uint64_t counter;
uint64_t counter_mask = ntohll(0x00000000ffffffffULL);
int i;
/*
* Increment counter.
* Counter bits are confined to the bottom 32 bits
*/
counter = ntohll(ctx->gcm_cb[1] & counter_mask);
counter = htonll(counter + 1);
counter &= counter_mask;
ctx->gcm_cb[1] = (ctx->gcm_cb[1] & ~counter_mask) | counter;
datap = (uint8_t *)ctx->gcm_remainder;
outp = &((ctx->gcm_pt_buf)[index]);
counterp = (uint8_t *)ctx->gcm_tmp;
/* authentication tag */
bzero((uint8_t *)ctx->gcm_tmp, block_size);
bcopy(datap, (uint8_t *)ctx->gcm_tmp, ctx->gcm_remainder_len);
/* add ciphertext to the hash */
GHASH(ctx, ctx->gcm_tmp, ctx->gcm_ghash, gcm_impl_get_ops());
/* decrypt remaining ciphertext */
encrypt_block(ctx->gcm_keysched, (uint8_t *)ctx->gcm_cb, counterp);
/* XOR with counter block */
for (i = 0; i < ctx->gcm_remainder_len; i++) {
outp[i] = datap[i] ^ counterp[i];
}
}
/* ARGSUSED */
int
gcm_mode_decrypt_contiguous_blocks(gcm_ctx_t *ctx, char *data, size_t length,
crypto_data_t *out, size_t block_size,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*copy_block)(uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
size_t new_len;
uint8_t *new;
/*
* Copy contiguous ciphertext input blocks to plaintext buffer.
* Ciphertext will be decrypted in the final.
*/
if (length > 0) {
new_len = ctx->gcm_pt_buf_len + length;
new = vmem_alloc(new_len, ctx->gcm_kmflag);
bcopy(ctx->gcm_pt_buf, new, ctx->gcm_pt_buf_len);
vmem_free(ctx->gcm_pt_buf, ctx->gcm_pt_buf_len);
if (new == NULL)
return (CRYPTO_HOST_MEMORY);
ctx->gcm_pt_buf = new;
ctx->gcm_pt_buf_len = new_len;
bcopy(data, &ctx->gcm_pt_buf[ctx->gcm_processed_data_len],
length);
ctx->gcm_processed_data_len += length;
}
ctx->gcm_remainder_len = 0;
return (CRYPTO_SUCCESS);
}
int
gcm_decrypt_final(gcm_ctx_t *ctx, crypto_data_t *out, size_t block_size,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
gcm_impl_ops_t *gops;
size_t pt_len;
size_t remainder;
uint8_t *ghash;
uint8_t *blockp;
uint8_t *cbp;
uint64_t counter;
uint64_t counter_mask = ntohll(0x00000000ffffffffULL);
int processed = 0, rv;
ASSERT(ctx->gcm_processed_data_len == ctx->gcm_pt_buf_len);
gops = gcm_impl_get_ops();
pt_len = ctx->gcm_processed_data_len - ctx->gcm_tag_len;
ghash = (uint8_t *)ctx->gcm_ghash;
blockp = ctx->gcm_pt_buf;
remainder = pt_len;
while (remainder > 0) {
/* Incomplete last block */
if (remainder < block_size) {
bcopy(blockp, ctx->gcm_remainder, remainder);
ctx->gcm_remainder_len = remainder;
/*
* not expecting anymore ciphertext, just
* compute plaintext for the remaining input
*/
gcm_decrypt_incomplete_block(ctx, block_size,
processed, encrypt_block, xor_block);
ctx->gcm_remainder_len = 0;
goto out;
}
/* add ciphertext to the hash */
GHASH(ctx, blockp, ghash, gops);
/*
* Increment counter.
* Counter bits are confined to the bottom 32 bits
*/
counter = ntohll(ctx->gcm_cb[1] & counter_mask);
counter = htonll(counter + 1);
counter &= counter_mask;
ctx->gcm_cb[1] = (ctx->gcm_cb[1] & ~counter_mask) | counter;
cbp = (uint8_t *)ctx->gcm_tmp;
encrypt_block(ctx->gcm_keysched, (uint8_t *)ctx->gcm_cb, cbp);
/* XOR with ciphertext */
xor_block(cbp, blockp);
processed += block_size;
blockp += block_size;
remainder -= block_size;
}
out:
ctx->gcm_len_a_len_c[1] = htonll(CRYPTO_BYTES2BITS(pt_len));
GHASH(ctx, ctx->gcm_len_a_len_c, ghash, gops);
encrypt_block(ctx->gcm_keysched, (uint8_t *)ctx->gcm_J0,
(uint8_t *)ctx->gcm_J0);
xor_block((uint8_t *)ctx->gcm_J0, ghash);
/* compare the input authentication tag with what we calculated */
if (bcmp(&ctx->gcm_pt_buf[pt_len], ghash, ctx->gcm_tag_len)) {
/* They don't match */
return (CRYPTO_INVALID_MAC);
} else {
rv = crypto_put_output_data(ctx->gcm_pt_buf, out, pt_len);
if (rv != CRYPTO_SUCCESS)
return (rv);
out->cd_offset += pt_len;
}
return (CRYPTO_SUCCESS);
}
static int
gcm_validate_args(CK_AES_GCM_PARAMS *gcm_param)
{
size_t tag_len;
/*
* Check the length of the authentication tag (in bits).
*/
tag_len = gcm_param->ulTagBits;
switch (tag_len) {
case 32:
case 64:
case 96:
case 104:
case 112:
case 120:
case 128:
break;
default:
return (CRYPTO_MECHANISM_PARAM_INVALID);
}
if (gcm_param->ulIvLen == 0)
return (CRYPTO_MECHANISM_PARAM_INVALID);
return (CRYPTO_SUCCESS);
}
static void
gcm_format_initial_blocks(uchar_t *iv, ulong_t iv_len,
gcm_ctx_t *ctx, size_t block_size,
void (*copy_block)(uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
gcm_impl_ops_t *gops;
uint8_t *cb;
ulong_t remainder = iv_len;
ulong_t processed = 0;
uint8_t *datap, *ghash;
uint64_t len_a_len_c[2];
gops = gcm_impl_get_ops();
ghash = (uint8_t *)ctx->gcm_ghash;
cb = (uint8_t *)ctx->gcm_cb;
if (iv_len == 12) {
bcopy(iv, cb, 12);
cb[12] = 0;
cb[13] = 0;
cb[14] = 0;
cb[15] = 1;
/* J0 will be used again in the final */
copy_block(cb, (uint8_t *)ctx->gcm_J0);
} else {
/* GHASH the IV */
do {
if (remainder < block_size) {
bzero(cb, block_size);
bcopy(&(iv[processed]), cb, remainder);
datap = (uint8_t *)cb;
remainder = 0;
} else {
datap = (uint8_t *)(&(iv[processed]));
processed += block_size;
remainder -= block_size;
}
GHASH(ctx, datap, ghash, gops);
} while (remainder > 0);
len_a_len_c[0] = 0;
len_a_len_c[1] = htonll(CRYPTO_BYTES2BITS(iv_len));
GHASH(ctx, len_a_len_c, ctx->gcm_J0, gops);
/* J0 will be used again in the final */
copy_block((uint8_t *)ctx->gcm_J0, (uint8_t *)cb);
}
}
/*
* The following function is called at encrypt or decrypt init time
* for AES GCM mode.
*/
int
gcm_init(gcm_ctx_t *ctx, unsigned char *iv, size_t iv_len,
unsigned char *auth_data, size_t auth_data_len, size_t block_size,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*copy_block)(uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
gcm_impl_ops_t *gops;
uint8_t *ghash, *datap, *authp;
size_t remainder, processed;
/* encrypt zero block to get subkey H */
bzero(ctx->gcm_H, sizeof (ctx->gcm_H));
encrypt_block(ctx->gcm_keysched, (uint8_t *)ctx->gcm_H,
(uint8_t *)ctx->gcm_H);
gcm_format_initial_blocks(iv, iv_len, ctx, block_size,
copy_block, xor_block);
gops = gcm_impl_get_ops();
authp = (uint8_t *)ctx->gcm_tmp;
ghash = (uint8_t *)ctx->gcm_ghash;
bzero(authp, block_size);
bzero(ghash, block_size);
processed = 0;
remainder = auth_data_len;
do {
if (remainder < block_size) {
/*
* There's not a block full of data, pad rest of
* buffer with zero
*/
bzero(authp, block_size);
bcopy(&(auth_data[processed]), authp, remainder);
datap = (uint8_t *)authp;
remainder = 0;
} else {
datap = (uint8_t *)(&(auth_data[processed]));
processed += block_size;
remainder -= block_size;
}
/* add auth data to the hash */
GHASH(ctx, datap, ghash, gops);
} while (remainder > 0);
return (CRYPTO_SUCCESS);
}
int
gcm_init_ctx(gcm_ctx_t *gcm_ctx, char *param, size_t block_size,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*copy_block)(uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
int rv;
CK_AES_GCM_PARAMS *gcm_param;
if (param != NULL) {
gcm_param = (CK_AES_GCM_PARAMS *)(void *)param;
if ((rv = gcm_validate_args(gcm_param)) != 0) {
return (rv);
}
gcm_ctx->gcm_tag_len = gcm_param->ulTagBits;
gcm_ctx->gcm_tag_len >>= 3;
gcm_ctx->gcm_processed_data_len = 0;
/* these values are in bits */
gcm_ctx->gcm_len_a_len_c[0]
= htonll(CRYPTO_BYTES2BITS(gcm_param->ulAADLen));
rv = CRYPTO_SUCCESS;
gcm_ctx->gcm_flags |= GCM_MODE;
} else {
rv = CRYPTO_MECHANISM_PARAM_INVALID;
goto out;
}
if (gcm_init(gcm_ctx, gcm_param->pIv, gcm_param->ulIvLen,
gcm_param->pAAD, gcm_param->ulAADLen, block_size,
encrypt_block, copy_block, xor_block) != 0) {
rv = CRYPTO_MECHANISM_PARAM_INVALID;
}
out:
return (rv);
}
int
gmac_init_ctx(gcm_ctx_t *gcm_ctx, char *param, size_t block_size,
int (*encrypt_block)(const void *, const uint8_t *, uint8_t *),
void (*copy_block)(uint8_t *, uint8_t *),
void (*xor_block)(uint8_t *, uint8_t *))
{
int rv;
CK_AES_GMAC_PARAMS *gmac_param;
if (param != NULL) {
gmac_param = (CK_AES_GMAC_PARAMS *)(void *)param;
gcm_ctx->gcm_tag_len = CRYPTO_BITS2BYTES(AES_GMAC_TAG_BITS);
gcm_ctx->gcm_processed_data_len = 0;
/* these values are in bits */
gcm_ctx->gcm_len_a_len_c[0]
= htonll(CRYPTO_BYTES2BITS(gmac_param->ulAADLen));
rv = CRYPTO_SUCCESS;
gcm_ctx->gcm_flags |= GMAC_MODE;
} else {
rv = CRYPTO_MECHANISM_PARAM_INVALID;
goto out;
}
if (gcm_init(gcm_ctx, gmac_param->pIv, AES_GMAC_IV_LEN,
gmac_param->pAAD, gmac_param->ulAADLen, block_size,
encrypt_block, copy_block, xor_block) != 0) {
rv = CRYPTO_MECHANISM_PARAM_INVALID;
}
out:
return (rv);
}
void *
gcm_alloc_ctx(int kmflag)
{
gcm_ctx_t *gcm_ctx;
if ((gcm_ctx = kmem_zalloc(sizeof (gcm_ctx_t), kmflag)) == NULL)
return (NULL);
gcm_ctx->gcm_flags = GCM_MODE;
return (gcm_ctx);
}
void *
gmac_alloc_ctx(int kmflag)
{
gcm_ctx_t *gcm_ctx;
if ((gcm_ctx = kmem_zalloc(sizeof (gcm_ctx_t), kmflag)) == NULL)
return (NULL);
gcm_ctx->gcm_flags = GMAC_MODE;
return (gcm_ctx);
}
void
gcm_set_kmflag(gcm_ctx_t *ctx, int kmflag)
{
ctx->gcm_kmflag = kmflag;
}
/* GCM implementation that contains the fastest methods */
static gcm_impl_ops_t gcm_fastest_impl = {
.name = "fastest"
};
/* All compiled in implementations */
const gcm_impl_ops_t *gcm_all_impl[] = {
&gcm_generic_impl,
#if defined(__x86_64) && defined(HAVE_PCLMULQDQ)
&gcm_pclmulqdq_impl,
#endif
};
/* Indicate that benchmark has been completed */
static boolean_t gcm_impl_initialized = B_FALSE;
/* Select GCM implementation */
#define IMPL_FASTEST (UINT32_MAX)
#define IMPL_CYCLE (UINT32_MAX-1)
#define GCM_IMPL_READ(i) (*(volatile uint32_t *) &(i))
static uint32_t icp_gcm_impl = IMPL_FASTEST;
static uint32_t user_sel_impl = IMPL_FASTEST;
/* Hold all supported implementations */
static size_t gcm_supp_impl_cnt = 0;
static gcm_impl_ops_t *gcm_supp_impl[ARRAY_SIZE(gcm_all_impl)];
/*
* Selects the gcm operation
*/
gcm_impl_ops_t *
gcm_impl_get_ops()
{
gcm_impl_ops_t *ops = NULL;
const uint32_t impl = GCM_IMPL_READ(icp_gcm_impl);
switch (impl) {
case IMPL_FASTEST:
ASSERT(gcm_impl_initialized);
ops = &gcm_fastest_impl;
break;
case IMPL_CYCLE:
{
ASSERT(gcm_impl_initialized);
ASSERT3U(gcm_supp_impl_cnt, >, 0);
/* Cycle through supported implementations */
static size_t cycle_impl_idx = 0;
size_t idx = (++cycle_impl_idx) % gcm_supp_impl_cnt;
ops = gcm_supp_impl[idx];
}
break;
default:
ASSERT3U(impl, <, gcm_supp_impl_cnt);
ASSERT3U(gcm_supp_impl_cnt, >, 0);
if (impl < ARRAY_SIZE(gcm_all_impl))
ops = gcm_supp_impl[impl];
break;
}
ASSERT3P(ops, !=, NULL);
return (ops);
}
void
gcm_impl_init(void)
{
gcm_impl_ops_t *curr_impl;
int i, c;
/* move supported impl into aes_supp_impls */
for (i = 0, c = 0; i < ARRAY_SIZE(gcm_all_impl); i++) {
curr_impl = (gcm_impl_ops_t *)gcm_all_impl[i];
if (curr_impl->is_supported())
gcm_supp_impl[c++] = (gcm_impl_ops_t *)curr_impl;
}
gcm_supp_impl_cnt = c;
/* set fastest implementation. assume hardware accelerated is fastest */
#if defined(__x86_64) && defined(HAVE_PCLMULQDQ)
if (gcm_pclmulqdq_impl.is_supported()) {
memcpy(&gcm_fastest_impl, &gcm_pclmulqdq_impl,
sizeof (gcm_fastest_impl));
} else
#endif
{
memcpy(&gcm_fastest_impl, &gcm_generic_impl,
sizeof (gcm_fastest_impl));
}
strcpy(gcm_fastest_impl.name, "fastest");
/* Finish initialization */
atomic_swap_32(&icp_gcm_impl, user_sel_impl);
gcm_impl_initialized = B_TRUE;
}
static const struct {
char *name;
uint32_t sel;
} gcm_impl_opts[] = {
{ "cycle", IMPL_CYCLE },
{ "fastest", IMPL_FASTEST },
};
/*
* Function sets desired gcm implementation.
*
* If we are called before init(), user preference will be saved in
* user_sel_impl, and applied in later init() call. This occurs when module
* parameter is specified on module load. Otherwise, directly update
* icp_gcm_impl.
*
* @val Name of gcm implementation to use
* @param Unused.
*/
int
gcm_impl_set(const char *val)
{
int err = -EINVAL;
char req_name[GCM_IMPL_NAME_MAX];
uint32_t impl = GCM_IMPL_READ(user_sel_impl);
size_t i;
/* sanitize input */
i = strnlen(val, GCM_IMPL_NAME_MAX);
if (i == 0 || i >= GCM_IMPL_NAME_MAX)
return (err);
strlcpy(req_name, val, GCM_IMPL_NAME_MAX);
while (i > 0 && isspace(req_name[i-1]))
i--;
req_name[i] = '\0';
/* Check mandatory options */
for (i = 0; i < ARRAY_SIZE(gcm_impl_opts); i++) {
if (strcmp(req_name, gcm_impl_opts[i].name) == 0) {
impl = gcm_impl_opts[i].sel;
err = 0;
break;
}
}
/* check all supported impl if init() was already called */
if (err != 0 && gcm_impl_initialized) {
/* check all supported implementations */
for (i = 0; i < gcm_supp_impl_cnt; i++) {
if (strcmp(req_name, gcm_supp_impl[i]->name) == 0) {
impl = i;
err = 0;
break;
}
}
}
if (err == 0) {
if (gcm_impl_initialized)
atomic_swap_32(&icp_gcm_impl, impl);
else
atomic_swap_32(&user_sel_impl, impl);
}
return (err);
}
#if defined(_KERNEL)
#include <linux/mod_compat.h>
static int
icp_gcm_impl_set(const char *val, zfs_kernel_param_t *kp)
{
return (gcm_impl_set(val));
}
static int
icp_gcm_impl_get(char *buffer, zfs_kernel_param_t *kp)
{
int i, cnt = 0;
char *fmt;
const uint32_t impl = GCM_IMPL_READ(icp_gcm_impl);
ASSERT(gcm_impl_initialized);
/* list mandatory options */
for (i = 0; i < ARRAY_SIZE(gcm_impl_opts); i++) {
fmt = (impl == gcm_impl_opts[i].sel) ? "[%s] " : "%s ";
cnt += sprintf(buffer + cnt, fmt, gcm_impl_opts[i].name);
}
/* list all supported implementations */
for (i = 0; i < gcm_supp_impl_cnt; i++) {
fmt = (i == impl) ? "[%s] " : "%s ";
cnt += sprintf(buffer + cnt, fmt, gcm_supp_impl[i]->name);
}
return (cnt);
}
module_param_call(icp_gcm_impl, icp_gcm_impl_set, icp_gcm_impl_get,
NULL, 0644);
MODULE_PARM_DESC(icp_gcm_impl, "Select gcm implementation.");
#endif