1 files changed, 531 insertions, 0 deletions

diff --git a/drivers/s390/crypto/zcrypt_msgtype50.c b/drivers/s390/crypto/zcrypt_msgtype50.c
new file mode 100644
index 0000000..035b6dc
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_msgtype50.c
@@ -0,0 +1,531 @@
+/*
+ *  zcrypt 2.1.0
+ *
+ *  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
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/atomic.h>
+#include <linux/uaccess.h>
+
+#include "ap_bus.h"
+#include "zcrypt_api.h"
+#include "zcrypt_error.h"
+#include "zcrypt_msgtype50.h"
+
+#define CEX3A_MAX_MOD_SIZE	512	/* 4096 bits	*/
+
+#define CEX2A_MAX_RESPONSE_SIZE 0x110	/* max outputdatalength + type80_hdr */
+
+#define CEX3A_MAX_RESPONSE_SIZE	0x210	/* 512 bit modulus
+					 * (max outputdatalength) +
+					 * type80_hdr*/
+
+MODULE_AUTHOR("IBM Corporation");
+MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \
+		   "Copyright IBM Corp. 2001, 2012");
+MODULE_LICENSE("GPL");
+
+static void zcrypt_cex2a_receive(struct ap_device *, struct ap_message *,
+				 struct ap_message *);
+
+/**
+ * The type 50 message family is associated with a CEX2A card.
+ *
+ * The four members of the family are described below.
+ *
+ * Note that all unsigned char arrays are right-justified and left-padded
+ * with zeroes.
+ *
+ * Note that all reserved fields must be zeroes.
+ */
+struct type50_hdr {
+	unsigned char	reserved1;
+	unsigned char	msg_type_code;	/* 0x50 */
+	unsigned short	msg_len;
+	unsigned char	reserved2;
+	unsigned char	ignored;
+	unsigned short	reserved3;
+} __packed;
+
+#define TYPE50_TYPE_CODE	0x50
+
+#define TYPE50_MEB1_FMT		0x0001
+#define TYPE50_MEB2_FMT		0x0002
+#define TYPE50_MEB3_FMT		0x0003
+#define TYPE50_CRB1_FMT		0x0011
+#define TYPE50_CRB2_FMT		0x0012
+#define TYPE50_CRB3_FMT		0x0013
+
+/* Mod-Exp, with a small modulus */
+struct type50_meb1_msg {
+	struct type50_hdr header;
+	unsigned short	keyblock_type;	/* 0x0001 */
+	unsigned char	reserved[6];
+	unsigned char	exponent[128];
+	unsigned char	modulus[128];
+	unsigned char	message[128];
+} __packed;
+
+/* Mod-Exp, with a large modulus */
+struct type50_meb2_msg {
+	struct type50_hdr header;
+	unsigned short	keyblock_type;	/* 0x0002 */
+	unsigned char	reserved[6];
+	unsigned char	exponent[256];
+	unsigned char	modulus[256];
+	unsigned char	message[256];
+} __packed;
+
+/* Mod-Exp, with a larger modulus */
+struct type50_meb3_msg {
+	struct type50_hdr header;
+	unsigned short	keyblock_type;	/* 0x0003 */
+	unsigned char	reserved[6];
+	unsigned char	exponent[512];
+	unsigned char	modulus[512];
+	unsigned char	message[512];
+} __packed;
+
+/* CRT, with a small modulus */
+struct type50_crb1_msg {
+	struct type50_hdr header;
+	unsigned short	keyblock_type;	/* 0x0011 */
+	unsigned char	reserved[6];
+	unsigned char	p[64];
+	unsigned char	q[64];
+	unsigned char	dp[64];
+	unsigned char	dq[64];
+	unsigned char	u[64];
+	unsigned char	message[128];
+} __packed;
+
+/* CRT, with a large modulus */
+struct type50_crb2_msg {
+	struct type50_hdr header;
+	unsigned short	keyblock_type;	/* 0x0012 */
+	unsigned char	reserved[6];
+	unsigned char	p[128];
+	unsigned char	q[128];
+	unsigned char	dp[128];
+	unsigned char	dq[128];
+	unsigned char	u[128];
+	unsigned char	message[256];
+} __packed;
+
+/* CRT, with a larger modulus */
+struct type50_crb3_msg {
+	struct type50_hdr header;
+	unsigned short	keyblock_type;	/* 0x0013 */
+	unsigned char	reserved[6];
+	unsigned char	p[256];
+	unsigned char	q[256];
+	unsigned char	dp[256];
+	unsigned char	dq[256];
+	unsigned char	u[256];
+	unsigned char	message[512];
+} __packed;
+
+/**
+ * The type 80 response family is associated with a CEX2A card.
+ *
+ * Note that all unsigned char arrays are right-justified and left-padded
+ * with zeroes.
+ *
+ * Note that all reserved fields must be zeroes.
+ */
+
+#define TYPE80_RSP_CODE 0x80
+
+struct type80_hdr {
+	unsigned char	reserved1;
+	unsigned char	type;		/* 0x80 */
+	unsigned short	len;
+	unsigned char	code;		/* 0x00 */
+	unsigned char	reserved2[3];
+	unsigned char	reserved3[8];
+} __packed;
+
+/**
+ * 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_t(int,
+				       CEX2A_MAX_RESPONSE_SIZE, t80h->len);
+		else
+			length = min_t(int,
+				       CEX3A_MAX_RESPONSE_SIZE, 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(MSGTYPE50_CRB2_MAX_MSG_SIZE,
+					 GFP_KERNEL);
+	else
+		ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_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(MSGTYPE50_CRB2_MAX_MSG_SIZE,
+					 GFP_KERNEL);
+	else
+		ap_msg.message = kmalloc(MSGTYPE50_CRB3_MAX_MSG_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 message type 50.
+ */
+static struct zcrypt_ops zcrypt_msgtype50_ops = {
+	.rsa_modexpo = zcrypt_cex2a_modexpo,
+	.rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt,
+	.owner = THIS_MODULE,
+	.variant = MSGTYPE50_VARIANT_DEFAULT,
+};
+
+int __init zcrypt_msgtype50_init(void)
+{
+	zcrypt_msgtype_register(&zcrypt_msgtype50_ops);
+	return 0;
+}
+
+void __exit zcrypt_msgtype50_exit(void)
+{
+	zcrypt_msgtype_unregister(&zcrypt_msgtype50_ops);
+}
+
+module_init(zcrypt_msgtype50_init);
+module_exit(zcrypt_msgtype50_exit);