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path: root/drivers/s390/crypto/zcrypt_cex2a.c
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Diffstat (limited to 'drivers/s390/crypto/zcrypt_cex2a.c')
-rw-r--r--drivers/s390/crypto/zcrypt_cex2a.c371
1 files changed, 19 insertions, 352 deletions
diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c
index 744c668f586..1e849d6e1df 100644
--- a/drivers/s390/crypto/zcrypt_cex2a.c
+++ b/drivers/s390/crypto/zcrypt_cex2a.c
@@ -1,13 +1,14 @@
/*
* zcrypt 2.1.0
*
- * Copyright IBM Corp. 2001, 2006
+ * Copyright IBM Corp. 2001, 2012
* Author(s): Robert Burroughs
* Eric Rossman (edrossma@us.ibm.com)
*
* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Ralph Wuerthner <rwuerthn@de.ibm.com>
+ * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -35,6 +36,7 @@
#include "zcrypt_api.h"
#include "zcrypt_error.h"
#include "zcrypt_cex2a.h"
+#include "zcrypt_msgtype50.h"
#define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */
#define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */
@@ -63,14 +65,12 @@ static struct ap_device_id zcrypt_cex2a_ids[] = {
MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids);
MODULE_AUTHOR("IBM Corporation");
-MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, "
- "Copyright IBM Corp. 2001, 2006");
+MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, " \
+ "Copyright IBM Corp. 2001, 2012");
MODULE_LICENSE("GPL");
static int zcrypt_cex2a_probe(struct ap_device *ap_dev);
static void zcrypt_cex2a_remove(struct ap_device *ap_dev);
-static void zcrypt_cex2a_receive(struct ap_device *, struct ap_message *,
- struct ap_message *);
static struct ap_driver zcrypt_cex2a_driver = {
.probe = zcrypt_cex2a_probe,
@@ -80,344 +80,6 @@ static struct ap_driver zcrypt_cex2a_driver = {
};
/**
- * Convert a ICAMEX message to a type50 MEX message.
- *
- * @zdev: crypto device pointer
- * @zreq: crypto request pointer
- * @mex: pointer to user input data
- *
- * Returns 0 on success or -EFAULT.
- */
-static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_device *zdev,
- struct ap_message *ap_msg,
- struct ica_rsa_modexpo *mex)
-{
- unsigned char *mod, *exp, *inp;
- int mod_len;
-
- mod_len = mex->inputdatalength;
-
- if (mod_len <= 128) {
- struct type50_meb1_msg *meb1 = ap_msg->message;
- memset(meb1, 0, sizeof(*meb1));
- ap_msg->length = sizeof(*meb1);
- meb1->header.msg_type_code = TYPE50_TYPE_CODE;
- meb1->header.msg_len = sizeof(*meb1);
- meb1->keyblock_type = TYPE50_MEB1_FMT;
- mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
- exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
- inp = meb1->message + sizeof(meb1->message) - mod_len;
- } else if (mod_len <= 256) {
- struct type50_meb2_msg *meb2 = ap_msg->message;
- memset(meb2, 0, sizeof(*meb2));
- ap_msg->length = sizeof(*meb2);
- meb2->header.msg_type_code = TYPE50_TYPE_CODE;
- meb2->header.msg_len = sizeof(*meb2);
- meb2->keyblock_type = TYPE50_MEB2_FMT;
- mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
- exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
- inp = meb2->message + sizeof(meb2->message) - mod_len;
- } else {
- /* mod_len > 256 = 4096 bit RSA Key */
- struct type50_meb3_msg *meb3 = ap_msg->message;
- memset(meb3, 0, sizeof(*meb3));
- ap_msg->length = sizeof(*meb3);
- meb3->header.msg_type_code = TYPE50_TYPE_CODE;
- meb3->header.msg_len = sizeof(*meb3);
- meb3->keyblock_type = TYPE50_MEB3_FMT;
- mod = meb3->modulus + sizeof(meb3->modulus) - mod_len;
- exp = meb3->exponent + sizeof(meb3->exponent) - mod_len;
- inp = meb3->message + sizeof(meb3->message) - mod_len;
- }
-
- if (copy_from_user(mod, mex->n_modulus, mod_len) ||
- copy_from_user(exp, mex->b_key, mod_len) ||
- copy_from_user(inp, mex->inputdata, mod_len))
- return -EFAULT;
- return 0;
-}
-
-/**
- * Convert a ICACRT message to a type50 CRT message.
- *
- * @zdev: crypto device pointer
- * @zreq: crypto request pointer
- * @crt: pointer to user input data
- *
- * Returns 0 on success or -EFAULT.
- */
-static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_device *zdev,
- struct ap_message *ap_msg,
- struct ica_rsa_modexpo_crt *crt)
-{
- int mod_len, short_len, long_len, long_offset, limit;
- unsigned char *p, *q, *dp, *dq, *u, *inp;
-
- mod_len = crt->inputdatalength;
- short_len = mod_len / 2;
- long_len = mod_len / 2 + 8;
-
- /*
- * CEX2A cannot handle p, dp, or U > 128 bytes.
- * If we have one of these, we need to do extra checking.
- * For CEX3A the limit is 256 bytes.
- */
- if (zdev->max_mod_size == CEX3A_MAX_MOD_SIZE)
- limit = 256;
- else
- limit = 128;
-
- if (long_len > limit) {
- /*
- * zcrypt_rsa_crt already checked for the leading
- * zeroes of np_prime, bp_key and u_mult_inc.
- */
- long_offset = long_len - limit;
- long_len = limit;
- } else
- long_offset = 0;
-
- /*
- * Instead of doing extra work for p, dp, U > 64 bytes, we'll just use
- * the larger message structure.
- */
- if (long_len <= 64) {
- struct type50_crb1_msg *crb1 = ap_msg->message;
- memset(crb1, 0, sizeof(*crb1));
- ap_msg->length = sizeof(*crb1);
- crb1->header.msg_type_code = TYPE50_TYPE_CODE;
- crb1->header.msg_len = sizeof(*crb1);
- crb1->keyblock_type = TYPE50_CRB1_FMT;
- p = crb1->p + sizeof(crb1->p) - long_len;
- q = crb1->q + sizeof(crb1->q) - short_len;
- dp = crb1->dp + sizeof(crb1->dp) - long_len;
- dq = crb1->dq + sizeof(crb1->dq) - short_len;
- u = crb1->u + sizeof(crb1->u) - long_len;
- inp = crb1->message + sizeof(crb1->message) - mod_len;
- } else if (long_len <= 128) {
- struct type50_crb2_msg *crb2 = ap_msg->message;
- memset(crb2, 0, sizeof(*crb2));
- ap_msg->length = sizeof(*crb2);
- crb2->header.msg_type_code = TYPE50_TYPE_CODE;
- crb2->header.msg_len = sizeof(*crb2);
- crb2->keyblock_type = TYPE50_CRB2_FMT;
- p = crb2->p + sizeof(crb2->p) - long_len;
- q = crb2->q + sizeof(crb2->q) - short_len;
- dp = crb2->dp + sizeof(crb2->dp) - long_len;
- dq = crb2->dq + sizeof(crb2->dq) - short_len;
- u = crb2->u + sizeof(crb2->u) - long_len;
- inp = crb2->message + sizeof(crb2->message) - mod_len;
- } else {
- /* long_len >= 256 */
- struct type50_crb3_msg *crb3 = ap_msg->message;
- memset(crb3, 0, sizeof(*crb3));
- ap_msg->length = sizeof(*crb3);
- crb3->header.msg_type_code = TYPE50_TYPE_CODE;
- crb3->header.msg_len = sizeof(*crb3);
- crb3->keyblock_type = TYPE50_CRB3_FMT;
- p = crb3->p + sizeof(crb3->p) - long_len;
- q = crb3->q + sizeof(crb3->q) - short_len;
- dp = crb3->dp + sizeof(crb3->dp) - long_len;
- dq = crb3->dq + sizeof(crb3->dq) - short_len;
- u = crb3->u + sizeof(crb3->u) - long_len;
- inp = crb3->message + sizeof(crb3->message) - mod_len;
- }
-
- if (copy_from_user(p, crt->np_prime + long_offset, long_len) ||
- copy_from_user(q, crt->nq_prime, short_len) ||
- copy_from_user(dp, crt->bp_key + long_offset, long_len) ||
- copy_from_user(dq, crt->bq_key, short_len) ||
- copy_from_user(u, crt->u_mult_inv + long_offset, long_len) ||
- copy_from_user(inp, crt->inputdata, mod_len))
- return -EFAULT;
-
- return 0;
-}
-
-/**
- * Copy results from a type 80 reply message back to user space.
- *
- * @zdev: crypto device pointer
- * @reply: reply AP message.
- * @data: pointer to user output data
- * @length: size of user output data
- *
- * Returns 0 on success or -EFAULT.
- */
-static int convert_type80(struct zcrypt_device *zdev,
- struct ap_message *reply,
- char __user *outputdata,
- unsigned int outputdatalength)
-{
- struct type80_hdr *t80h = reply->message;
- unsigned char *data;
-
- if (t80h->len < sizeof(*t80h) + outputdatalength) {
- /* The result is too short, the CEX2A card may not do that.. */
- zdev->online = 0;
- return -EAGAIN; /* repeat the request on a different device. */
- }
- if (zdev->user_space_type == ZCRYPT_CEX2A)
- BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
- else
- BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE);
- data = reply->message + t80h->len - outputdatalength;
- if (copy_to_user(outputdata, data, outputdatalength))
- return -EFAULT;
- return 0;
-}
-
-static int convert_response(struct zcrypt_device *zdev,
- struct ap_message *reply,
- char __user *outputdata,
- unsigned int outputdatalength)
-{
- /* Response type byte is the second byte in the response. */
- switch (((unsigned char *) reply->message)[1]) {
- case TYPE82_RSP_CODE:
- case TYPE88_RSP_CODE:
- return convert_error(zdev, reply);
- case TYPE80_RSP_CODE:
- return convert_type80(zdev, reply,
- outputdata, outputdatalength);
- default: /* Unknown response type, this should NEVER EVER happen */
- zdev->online = 0;
- return -EAGAIN; /* repeat the request on a different device. */
- }
-}
-
-/**
- * This function is called from the AP bus code after a crypto request
- * "msg" has finished with the reply message "reply".
- * It is called from tasklet context.
- * @ap_dev: pointer to the AP device
- * @msg: pointer to the AP message
- * @reply: pointer to the AP reply message
- */
-static void zcrypt_cex2a_receive(struct ap_device *ap_dev,
- struct ap_message *msg,
- struct ap_message *reply)
-{
- static struct error_hdr error_reply = {
- .type = TYPE82_RSP_CODE,
- .reply_code = REP82_ERROR_MACHINE_FAILURE,
- };
- struct type80_hdr *t80h;
- int length;
-
- /* Copy the reply message to the request message buffer. */
- if (IS_ERR(reply)) {
- memcpy(msg->message, &error_reply, sizeof(error_reply));
- goto out;
- }
- t80h = reply->message;
- if (t80h->type == TYPE80_RSP_CODE) {
- if (ap_dev->device_type == AP_DEVICE_TYPE_CEX2A)
- length = min(CEX2A_MAX_RESPONSE_SIZE, (int) t80h->len);
- else
- length = min(CEX3A_MAX_RESPONSE_SIZE, (int) t80h->len);
- memcpy(msg->message, reply->message, length);
- } else
- memcpy(msg->message, reply->message, sizeof error_reply);
-out:
- complete((struct completion *) msg->private);
-}
-
-static atomic_t zcrypt_step = ATOMIC_INIT(0);
-
-/**
- * The request distributor calls this function if it picked the CEX2A
- * device to handle a modexpo request.
- * @zdev: pointer to zcrypt_device structure that identifies the
- * CEX2A device to the request distributor
- * @mex: pointer to the modexpo request buffer
- */
-static long zcrypt_cex2a_modexpo(struct zcrypt_device *zdev,
- struct ica_rsa_modexpo *mex)
-{
- struct ap_message ap_msg;
- struct completion work;
- int rc;
-
- ap_init_message(&ap_msg);
- if (zdev->user_space_type == ZCRYPT_CEX2A)
- ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL);
- else
- ap_msg.message = kmalloc(CEX3A_MAX_MESSAGE_SIZE, GFP_KERNEL);
- if (!ap_msg.message)
- return -ENOMEM;
- ap_msg.receive = zcrypt_cex2a_receive;
- ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
- atomic_inc_return(&zcrypt_step);
- ap_msg.private = &work;
- rc = ICAMEX_msg_to_type50MEX_msg(zdev, &ap_msg, mex);
- if (rc)
- goto out_free;
- init_completion(&work);
- ap_queue_message(zdev->ap_dev, &ap_msg);
- rc = wait_for_completion_interruptible(&work);
- if (rc == 0)
- rc = convert_response(zdev, &ap_msg, mex->outputdata,
- mex->outputdatalength);
- else
- /* Signal pending. */
- ap_cancel_message(zdev->ap_dev, &ap_msg);
-out_free:
- kfree(ap_msg.message);
- return rc;
-}
-
-/**
- * The request distributor calls this function if it picked the CEX2A
- * device to handle a modexpo_crt request.
- * @zdev: pointer to zcrypt_device structure that identifies the
- * CEX2A device to the request distributor
- * @crt: pointer to the modexpoc_crt request buffer
- */
-static long zcrypt_cex2a_modexpo_crt(struct zcrypt_device *zdev,
- struct ica_rsa_modexpo_crt *crt)
-{
- struct ap_message ap_msg;
- struct completion work;
- int rc;
-
- ap_init_message(&ap_msg);
- if (zdev->user_space_type == ZCRYPT_CEX2A)
- ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL);
- else
- ap_msg.message = kmalloc(CEX3A_MAX_MESSAGE_SIZE, GFP_KERNEL);
- if (!ap_msg.message)
- return -ENOMEM;
- ap_msg.receive = zcrypt_cex2a_receive;
- ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
- atomic_inc_return(&zcrypt_step);
- ap_msg.private = &work;
- rc = ICACRT_msg_to_type50CRT_msg(zdev, &ap_msg, crt);
- if (rc)
- goto out_free;
- init_completion(&work);
- ap_queue_message(zdev->ap_dev, &ap_msg);
- rc = wait_for_completion_interruptible(&work);
- if (rc == 0)
- rc = convert_response(zdev, &ap_msg, crt->outputdata,
- crt->outputdatalength);
- else
- /* Signal pending. */
- ap_cancel_message(zdev->ap_dev, &ap_msg);
-out_free:
- kfree(ap_msg.message);
- return rc;
-}
-
-/**
- * The crypto operations for a CEX2A card.
- */
-static struct zcrypt_ops zcrypt_cex2a_ops = {
- .rsa_modexpo = zcrypt_cex2a_modexpo,
- .rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt,
-};
-
-/**
* Probe function for CEX2A cards. It always accepts the AP device
* since the bus_match already checked the hardware type.
* @ap_dev: pointer to the AP device.
@@ -449,7 +111,8 @@ static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
zdev->min_mod_size = CEX2A_MIN_MOD_SIZE;
zdev->max_mod_size = CEX2A_MAX_MOD_SIZE;
zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
- if (ap_4096_commands_available(ap_dev->qid)) {
+ if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
+ ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
zdev->max_mod_size = CEX3A_MAX_MOD_SIZE;
zdev->max_exp_bit_length = CEX3A_MAX_MOD_SIZE;
}
@@ -457,16 +120,18 @@ static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
zdev->speed_rating = CEX3A_SPEED_RATING;
break;
}
- if (zdev != NULL) {
- zdev->ap_dev = ap_dev;
- zdev->ops = &zcrypt_cex2a_ops;
- zdev->online = 1;
- ap_dev->reply = &zdev->reply;
- ap_dev->private = zdev;
- rc = zcrypt_device_register(zdev);
- }
+ if (!zdev)
+ return -ENODEV;
+ zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
+ MSGTYPE50_VARIANT_DEFAULT);
+ zdev->ap_dev = ap_dev;
+ zdev->online = 1;
+ ap_dev->reply = &zdev->reply;
+ ap_dev->private = zdev;
+ rc = zcrypt_device_register(zdev);
if (rc) {
ap_dev->private = NULL;
+ zcrypt_msgtype_release(zdev->ops);
zcrypt_device_free(zdev);
}
return rc;
@@ -479,8 +144,10 @@ static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
static void zcrypt_cex2a_remove(struct ap_device *ap_dev)
{
struct zcrypt_device *zdev = ap_dev->private;
+ struct zcrypt_ops *zops = zdev->ops;
zcrypt_device_unregister(zdev);
+ zcrypt_msgtype_release(zops);
}
int __init zcrypt_cex2a_init(void)