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drbd: Use shash and ahash
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This patch replaces uses of the long obsolete hash interface with
either shash (for non-SG users) or ahash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Herbert Xu committed Jan 27, 2016
1 parent 17bc197 commit 9534d67
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Showing 5 changed files with 103 additions and 87 deletions.
16 changes: 8 additions & 8 deletions drivers/block/drbd/drbd_int.h
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Original file line number Diff line number Diff line change
Expand Up @@ -26,13 +26,13 @@
#ifndef _DRBD_INT_H
#define _DRBD_INT_H

#include <crypto/hash.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/crypto.h>
#include <linux/ratelimit.h>
#include <linux/tcp.h>
#include <linux/mutex.h>
Expand Down Expand Up @@ -724,11 +724,11 @@ struct drbd_connection {

struct list_head transfer_log; /* all requests not yet fully processed */

struct crypto_hash *cram_hmac_tfm;
struct crypto_hash *integrity_tfm; /* checksums we compute, updates protected by connection->data->mutex */
struct crypto_hash *peer_integrity_tfm; /* checksums we verify, only accessed from receiver thread */
struct crypto_hash *csums_tfm;
struct crypto_hash *verify_tfm;
struct crypto_shash *cram_hmac_tfm;
struct crypto_ahash *integrity_tfm; /* checksums we compute, updates protected by connection->data->mutex */
struct crypto_ahash *peer_integrity_tfm; /* checksums we verify, only accessed from receiver thread */
struct crypto_ahash *csums_tfm;
struct crypto_ahash *verify_tfm;
void *int_dig_in;
void *int_dig_vv;

Expand Down Expand Up @@ -1524,8 +1524,8 @@ static inline void ov_out_of_sync_print(struct drbd_device *device)
}


extern void drbd_csum_bio(struct crypto_hash *, struct bio *, void *);
extern void drbd_csum_ee(struct crypto_hash *, struct drbd_peer_request *, void *);
extern void drbd_csum_bio(struct crypto_ahash *, struct bio *, void *);
extern void drbd_csum_ee(struct crypto_ahash *, struct drbd_peer_request *, void *);
/* worker callbacks */
extern int w_e_end_data_req(struct drbd_work *, int);
extern int w_e_end_rsdata_req(struct drbd_work *, int);
Expand Down
16 changes: 8 additions & 8 deletions drivers/block/drbd/drbd_main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1340,7 +1340,7 @@ void drbd_send_ack_dp(struct drbd_peer_device *peer_device, enum drbd_packet cmd
struct p_data *dp, int data_size)
{
if (peer_device->connection->peer_integrity_tfm)
data_size -= crypto_hash_digestsize(peer_device->connection->peer_integrity_tfm);
data_size -= crypto_ahash_digestsize(peer_device->connection->peer_integrity_tfm);
_drbd_send_ack(peer_device, cmd, dp->sector, cpu_to_be32(data_size),
dp->block_id);
}
Expand Down Expand Up @@ -1629,7 +1629,7 @@ int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *
sock = &peer_device->connection->data;
p = drbd_prepare_command(peer_device, sock);
digest_size = peer_device->connection->integrity_tfm ?
crypto_hash_digestsize(peer_device->connection->integrity_tfm) : 0;
crypto_ahash_digestsize(peer_device->connection->integrity_tfm) : 0;

if (!p)
return -EIO;
Expand Down Expand Up @@ -1718,7 +1718,7 @@ int drbd_send_block(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
p = drbd_prepare_command(peer_device, sock);

digest_size = peer_device->connection->integrity_tfm ?
crypto_hash_digestsize(peer_device->connection->integrity_tfm) : 0;
crypto_ahash_digestsize(peer_device->connection->integrity_tfm) : 0;

if (!p)
return -EIO;
Expand Down Expand Up @@ -2498,11 +2498,11 @@ void conn_free_crypto(struct drbd_connection *connection)
{
drbd_free_sock(connection);

crypto_free_hash(connection->csums_tfm);
crypto_free_hash(connection->verify_tfm);
crypto_free_hash(connection->cram_hmac_tfm);
crypto_free_hash(connection->integrity_tfm);
crypto_free_hash(connection->peer_integrity_tfm);
crypto_free_ahash(connection->csums_tfm);
crypto_free_ahash(connection->verify_tfm);
crypto_free_shash(connection->cram_hmac_tfm);
crypto_free_ahash(connection->integrity_tfm);
crypto_free_ahash(connection->peer_integrity_tfm);
kfree(connection->int_dig_in);
kfree(connection->int_dig_vv);

Expand Down
59 changes: 37 additions & 22 deletions drivers/block/drbd/drbd_nl.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2160,19 +2160,34 @@ check_net_options(struct drbd_connection *connection, struct net_conf *new_net_c
}

struct crypto {
struct crypto_hash *verify_tfm;
struct crypto_hash *csums_tfm;
struct crypto_hash *cram_hmac_tfm;
struct crypto_hash *integrity_tfm;
struct crypto_ahash *verify_tfm;
struct crypto_ahash *csums_tfm;
struct crypto_shash *cram_hmac_tfm;
struct crypto_ahash *integrity_tfm;
};

static int
alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
alloc_shash(struct crypto_shash **tfm, char *tfm_name, int err_alg)
{
if (!tfm_name[0])
return NO_ERROR;

*tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
*tfm = crypto_alloc_shash(tfm_name, 0, 0);
if (IS_ERR(*tfm)) {
*tfm = NULL;
return err_alg;
}

return NO_ERROR;
}

static int
alloc_ahash(struct crypto_ahash **tfm, char *tfm_name, int err_alg)
{
if (!tfm_name[0])
return NO_ERROR;

*tfm = crypto_alloc_ahash(tfm_name, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(*tfm)) {
*tfm = NULL;
return err_alg;
Expand All @@ -2187,35 +2202,35 @@ alloc_crypto(struct crypto *crypto, struct net_conf *new_net_conf)
char hmac_name[CRYPTO_MAX_ALG_NAME];
enum drbd_ret_code rv;

rv = alloc_hash(&crypto->csums_tfm, new_net_conf->csums_alg,
ERR_CSUMS_ALG);
rv = alloc_ahash(&crypto->csums_tfm, new_net_conf->csums_alg,
ERR_CSUMS_ALG);
if (rv != NO_ERROR)
return rv;
rv = alloc_hash(&crypto->verify_tfm, new_net_conf->verify_alg,
ERR_VERIFY_ALG);
rv = alloc_ahash(&crypto->verify_tfm, new_net_conf->verify_alg,
ERR_VERIFY_ALG);
if (rv != NO_ERROR)
return rv;
rv = alloc_hash(&crypto->integrity_tfm, new_net_conf->integrity_alg,
ERR_INTEGRITY_ALG);
rv = alloc_ahash(&crypto->integrity_tfm, new_net_conf->integrity_alg,
ERR_INTEGRITY_ALG);
if (rv != NO_ERROR)
return rv;
if (new_net_conf->cram_hmac_alg[0] != 0) {
snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
new_net_conf->cram_hmac_alg);

rv = alloc_hash(&crypto->cram_hmac_tfm, hmac_name,
ERR_AUTH_ALG);
rv = alloc_shash(&crypto->cram_hmac_tfm, hmac_name,
ERR_AUTH_ALG);
}

return rv;
}

static void free_crypto(struct crypto *crypto)
{
crypto_free_hash(crypto->cram_hmac_tfm);
crypto_free_hash(crypto->integrity_tfm);
crypto_free_hash(crypto->csums_tfm);
crypto_free_hash(crypto->verify_tfm);
crypto_free_shash(crypto->cram_hmac_tfm);
crypto_free_ahash(crypto->integrity_tfm);
crypto_free_ahash(crypto->csums_tfm);
crypto_free_ahash(crypto->verify_tfm);
}

int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
Expand Down Expand Up @@ -2292,23 +2307,23 @@ int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
rcu_assign_pointer(connection->net_conf, new_net_conf);

if (!rsr) {
crypto_free_hash(connection->csums_tfm);
crypto_free_ahash(connection->csums_tfm);
connection->csums_tfm = crypto.csums_tfm;
crypto.csums_tfm = NULL;
}
if (!ovr) {
crypto_free_hash(connection->verify_tfm);
crypto_free_ahash(connection->verify_tfm);
connection->verify_tfm = crypto.verify_tfm;
crypto.verify_tfm = NULL;
}

crypto_free_hash(connection->integrity_tfm);
crypto_free_ahash(connection->integrity_tfm);
connection->integrity_tfm = crypto.integrity_tfm;
if (connection->cstate >= C_WF_REPORT_PARAMS && connection->agreed_pro_version >= 100)
/* Do this without trying to take connection->data.mutex again. */
__drbd_send_protocol(connection, P_PROTOCOL_UPDATE);

crypto_free_hash(connection->cram_hmac_tfm);
crypto_free_shash(connection->cram_hmac_tfm);
connection->cram_hmac_tfm = crypto.cram_hmac_tfm;

mutex_unlock(&connection->resource->conf_update);
Expand Down
56 changes: 26 additions & 30 deletions drivers/block/drbd/drbd_receiver.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1627,7 +1627,7 @@ read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector,

digest_size = 0;
if (!trim && peer_device->connection->peer_integrity_tfm) {
digest_size = crypto_hash_digestsize(peer_device->connection->peer_integrity_tfm);
digest_size = crypto_ahash_digestsize(peer_device->connection->peer_integrity_tfm);
/*
* FIXME: Receive the incoming digest into the receive buffer
* here, together with its struct p_data?
Expand Down Expand Up @@ -1741,7 +1741,7 @@ static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_req

digest_size = 0;
if (peer_device->connection->peer_integrity_tfm) {
digest_size = crypto_hash_digestsize(peer_device->connection->peer_integrity_tfm);
digest_size = crypto_ahash_digestsize(peer_device->connection->peer_integrity_tfm);
err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size);
if (err)
return err;
Expand Down Expand Up @@ -3321,7 +3321,7 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
int p_proto, p_discard_my_data, p_two_primaries, cf;
struct net_conf *nc, *old_net_conf, *new_net_conf = NULL;
char integrity_alg[SHARED_SECRET_MAX] = "";
struct crypto_hash *peer_integrity_tfm = NULL;
struct crypto_ahash *peer_integrity_tfm = NULL;
void *int_dig_in = NULL, *int_dig_vv = NULL;

p_proto = be32_to_cpu(p->protocol);
Expand Down Expand Up @@ -3402,14 +3402,14 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
* change.
*/

peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC);
peer_integrity_tfm = crypto_alloc_ahash(integrity_alg, 0, CRYPTO_ALG_ASYNC);
if (!peer_integrity_tfm) {
drbd_err(connection, "peer data-integrity-alg %s not supported\n",
integrity_alg);
goto disconnect;
}

hash_size = crypto_hash_digestsize(peer_integrity_tfm);
hash_size = crypto_ahash_digestsize(peer_integrity_tfm);
int_dig_in = kmalloc(hash_size, GFP_KERNEL);
int_dig_vv = kmalloc(hash_size, GFP_KERNEL);
if (!(int_dig_in && int_dig_vv)) {
Expand Down Expand Up @@ -3439,7 +3439,7 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
mutex_unlock(&connection->resource->conf_update);
mutex_unlock(&connection->data.mutex);

crypto_free_hash(connection->peer_integrity_tfm);
crypto_free_ahash(connection->peer_integrity_tfm);
kfree(connection->int_dig_in);
kfree(connection->int_dig_vv);
connection->peer_integrity_tfm = peer_integrity_tfm;
Expand All @@ -3457,7 +3457,7 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
disconnect_rcu_unlock:
rcu_read_unlock();
disconnect:
crypto_free_hash(peer_integrity_tfm);
crypto_free_ahash(peer_integrity_tfm);
kfree(int_dig_in);
kfree(int_dig_vv);
conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
Expand All @@ -3469,15 +3469,15 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
* return: NULL (alg name was "")
* ERR_PTR(error) if something goes wrong
* or the crypto hash ptr, if it worked out ok. */
static struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_device *device,
static struct crypto_ahash *drbd_crypto_alloc_digest_safe(const struct drbd_device *device,
const char *alg, const char *name)
{
struct crypto_hash *tfm;
struct crypto_ahash *tfm;

if (!alg[0])
return NULL;

tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
tfm = crypto_alloc_ahash(alg, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm)) {
drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n",
alg, name, PTR_ERR(tfm));
Expand Down Expand Up @@ -3530,8 +3530,8 @@ static int receive_SyncParam(struct drbd_connection *connection, struct packet_i
struct drbd_device *device;
struct p_rs_param_95 *p;
unsigned int header_size, data_size, exp_max_sz;
struct crypto_hash *verify_tfm = NULL;
struct crypto_hash *csums_tfm = NULL;
struct crypto_ahash *verify_tfm = NULL;
struct crypto_ahash *csums_tfm = NULL;
struct net_conf *old_net_conf, *new_net_conf = NULL;
struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL;
const int apv = connection->agreed_pro_version;
Expand Down Expand Up @@ -3678,14 +3678,14 @@ static int receive_SyncParam(struct drbd_connection *connection, struct packet_i
if (verify_tfm) {
strcpy(new_net_conf->verify_alg, p->verify_alg);
new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1;
crypto_free_hash(peer_device->connection->verify_tfm);
crypto_free_ahash(peer_device->connection->verify_tfm);
peer_device->connection->verify_tfm = verify_tfm;
drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg);
}
if (csums_tfm) {
strcpy(new_net_conf->csums_alg, p->csums_alg);
new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1;
crypto_free_hash(peer_device->connection->csums_tfm);
crypto_free_ahash(peer_device->connection->csums_tfm);
peer_device->connection->csums_tfm = csums_tfm;
drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg);
}
Expand Down Expand Up @@ -3729,9 +3729,9 @@ static int receive_SyncParam(struct drbd_connection *connection, struct packet_i
mutex_unlock(&connection->resource->conf_update);
/* just for completeness: actually not needed,
* as this is not reached if csums_tfm was ok. */
crypto_free_hash(csums_tfm);
crypto_free_ahash(csums_tfm);
/* but free the verify_tfm again, if csums_tfm did not work out */
crypto_free_hash(verify_tfm);
crypto_free_ahash(verify_tfm);
conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD);
return -EIO;
}
Expand Down Expand Up @@ -4925,14 +4925,13 @@ static int drbd_do_auth(struct drbd_connection *connection)
{
struct drbd_socket *sock;
char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */
struct scatterlist sg;
char *response = NULL;
char *right_response = NULL;
char *peers_ch = NULL;
unsigned int key_len;
char secret[SHARED_SECRET_MAX]; /* 64 byte */
unsigned int resp_size;
struct hash_desc desc;
SHASH_DESC_ON_STACK(desc, connection->cram_hmac_tfm);
struct packet_info pi;
struct net_conf *nc;
int err, rv;
Expand All @@ -4945,12 +4944,12 @@ static int drbd_do_auth(struct drbd_connection *connection)
memcpy(secret, nc->shared_secret, key_len);
rcu_read_unlock();

desc.tfm = connection->cram_hmac_tfm;
desc.flags = 0;
desc->tfm = connection->cram_hmac_tfm;
desc->flags = 0;

rv = crypto_hash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len);
rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len);
if (rv) {
drbd_err(connection, "crypto_hash_setkey() failed with %d\n", rv);
drbd_err(connection, "crypto_shash_setkey() failed with %d\n", rv);
rv = -1;
goto fail;
}
Expand Down Expand Up @@ -5011,18 +5010,15 @@ static int drbd_do_auth(struct drbd_connection *connection)
goto fail;
}

resp_size = crypto_hash_digestsize(connection->cram_hmac_tfm);
resp_size = crypto_shash_digestsize(connection->cram_hmac_tfm);
response = kmalloc(resp_size, GFP_NOIO);
if (response == NULL) {
drbd_err(connection, "kmalloc of response failed\n");
rv = -1;
goto fail;
}

sg_init_table(&sg, 1);
sg_set_buf(&sg, peers_ch, pi.size);

rv = crypto_hash_digest(&desc, &sg, sg.length, response);
rv = crypto_shash_digest(desc, peers_ch, pi.size, response);
if (rv) {
drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv);
rv = -1;
Expand Down Expand Up @@ -5070,9 +5066,8 @@ static int drbd_do_auth(struct drbd_connection *connection)
goto fail;
}

sg_set_buf(&sg, my_challenge, CHALLENGE_LEN);

rv = crypto_hash_digest(&desc, &sg, sg.length, right_response);
rv = crypto_shash_digest(desc, my_challenge, CHALLENGE_LEN,
right_response);
if (rv) {
drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv);
rv = -1;
Expand All @@ -5091,6 +5086,7 @@ static int drbd_do_auth(struct drbd_connection *connection)
kfree(peers_ch);
kfree(response);
kfree(right_response);
shash_desc_zero(desc);

return rv;
}
Expand Down
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