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![Harald Freudenberger](/assets/img/avatar_default.png)
Some cleanup in the s390 zcrypt device driver: - Removed fragments of pcixx crypto card code. This code can't be reached anymore because the hardware detection function does not recognize crypto cards < CEX2 since commit f56545430736 ("s390/zcrypt: Introduce QACT support for AP bus devices.") - Rename of some files and driver names which where still reflecting pcixx support to cex2a/cex2c. - Removed all the zcrypt version strings in the file headers. There is only one place left - the zcrypt.h header file is now the only place for zcrypt device driver version info. - Zcrypt version pump up from 2.2.0 to 2.2.1. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
558 lines
16 KiB
C
558 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright IBM Corp. 2001, 2012
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* Author(s): Robert Burroughs
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* Eric Rossman (edrossma@us.ibm.com)
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*
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* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
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* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
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*/
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#define KMSG_COMPONENT "zcrypt"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/atomic.h>
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#include <linux/uaccess.h>
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#include "ap_bus.h"
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#include "zcrypt_api.h"
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#include "zcrypt_error.h"
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#include "zcrypt_msgtype50.h"
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/* >= CEX3A: 4096 bits */
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#define CEX3A_MAX_MOD_SIZE 512
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/* CEX2A: max outputdatalength + type80_hdr */
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#define CEX2A_MAX_RESPONSE_SIZE 0x110
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/* >= CEX3A: 512 bit modulus, (max outputdatalength) + type80_hdr */
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#define CEX3A_MAX_RESPONSE_SIZE 0x210
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \
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"Copyright IBM Corp. 2001, 2012");
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MODULE_LICENSE("GPL");
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/**
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* The type 50 message family is associated with a CEXxA cards.
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*
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* The four members of the family are described below.
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*
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* Note that all unsigned char arrays are right-justified and left-padded
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* with zeroes.
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*
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* Note that all reserved fields must be zeroes.
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*/
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struct type50_hdr {
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unsigned char reserved1;
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unsigned char msg_type_code; /* 0x50 */
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unsigned short msg_len;
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unsigned char reserved2;
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unsigned char ignored;
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unsigned short reserved3;
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} __packed;
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#define TYPE50_TYPE_CODE 0x50
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#define TYPE50_MEB1_FMT 0x0001
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#define TYPE50_MEB2_FMT 0x0002
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#define TYPE50_MEB3_FMT 0x0003
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#define TYPE50_CRB1_FMT 0x0011
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#define TYPE50_CRB2_FMT 0x0012
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#define TYPE50_CRB3_FMT 0x0013
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/* Mod-Exp, with a small modulus */
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struct type50_meb1_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0001 */
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unsigned char reserved[6];
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unsigned char exponent[128];
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unsigned char modulus[128];
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unsigned char message[128];
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} __packed;
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/* Mod-Exp, with a large modulus */
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struct type50_meb2_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0002 */
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unsigned char reserved[6];
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unsigned char exponent[256];
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unsigned char modulus[256];
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unsigned char message[256];
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} __packed;
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/* Mod-Exp, with a larger modulus */
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struct type50_meb3_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0003 */
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unsigned char reserved[6];
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unsigned char exponent[512];
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unsigned char modulus[512];
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unsigned char message[512];
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} __packed;
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/* CRT, with a small modulus */
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struct type50_crb1_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0011 */
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unsigned char reserved[6];
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unsigned char p[64];
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unsigned char q[64];
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unsigned char dp[64];
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unsigned char dq[64];
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unsigned char u[64];
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unsigned char message[128];
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} __packed;
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/* CRT, with a large modulus */
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struct type50_crb2_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0012 */
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unsigned char reserved[6];
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unsigned char p[128];
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unsigned char q[128];
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unsigned char dp[128];
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unsigned char dq[128];
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unsigned char u[128];
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unsigned char message[256];
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} __packed;
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/* CRT, with a larger modulus */
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struct type50_crb3_msg {
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struct type50_hdr header;
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unsigned short keyblock_type; /* 0x0013 */
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unsigned char reserved[6];
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unsigned char p[256];
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unsigned char q[256];
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unsigned char dp[256];
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unsigned char dq[256];
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unsigned char u[256];
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unsigned char message[512];
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} __packed;
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/**
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* The type 80 response family is associated with a CEXxA cards.
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*
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* Note that all unsigned char arrays are right-justified and left-padded
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* with zeroes.
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*
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* Note that all reserved fields must be zeroes.
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*/
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#define TYPE80_RSP_CODE 0x80
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struct type80_hdr {
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unsigned char reserved1;
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unsigned char type; /* 0x80 */
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unsigned short len;
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unsigned char code; /* 0x00 */
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unsigned char reserved2[3];
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unsigned char reserved3[8];
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} __packed;
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unsigned int get_rsa_modex_fc(struct ica_rsa_modexpo *mex, int *fcode)
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{
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if (!mex->inputdatalength)
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return -EINVAL;
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if (mex->inputdatalength <= 128) /* 1024 bit */
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*fcode = MEX_1K;
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else if (mex->inputdatalength <= 256) /* 2048 bit */
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*fcode = MEX_2K;
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else /* 4096 bit */
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*fcode = MEX_4K;
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return 0;
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}
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unsigned int get_rsa_crt_fc(struct ica_rsa_modexpo_crt *crt, int *fcode)
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{
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if (!crt->inputdatalength)
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return -EINVAL;
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if (crt->inputdatalength <= 128) /* 1024 bit */
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*fcode = CRT_1K;
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else if (crt->inputdatalength <= 256) /* 2048 bit */
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*fcode = CRT_2K;
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else /* 4096 bit */
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*fcode = CRT_4K;
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return 0;
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}
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/**
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* Convert a ICAMEX message to a type50 MEX message.
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*
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* @zq: crypto queue pointer
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* @ap_msg: crypto request pointer
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* @mex: pointer to user input data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_queue *zq,
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struct ap_message *ap_msg,
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struct ica_rsa_modexpo *mex)
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{
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unsigned char *mod, *exp, *inp;
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int mod_len;
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mod_len = mex->inputdatalength;
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if (mod_len <= 128) {
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struct type50_meb1_msg *meb1 = ap_msg->message;
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memset(meb1, 0, sizeof(*meb1));
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ap_msg->length = sizeof(*meb1);
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meb1->header.msg_type_code = TYPE50_TYPE_CODE;
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meb1->header.msg_len = sizeof(*meb1);
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meb1->keyblock_type = TYPE50_MEB1_FMT;
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mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
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exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
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inp = meb1->message + sizeof(meb1->message) - mod_len;
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} else if (mod_len <= 256) {
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struct type50_meb2_msg *meb2 = ap_msg->message;
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memset(meb2, 0, sizeof(*meb2));
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ap_msg->length = sizeof(*meb2);
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meb2->header.msg_type_code = TYPE50_TYPE_CODE;
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meb2->header.msg_len = sizeof(*meb2);
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meb2->keyblock_type = TYPE50_MEB2_FMT;
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mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
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exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
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inp = meb2->message + sizeof(meb2->message) - mod_len;
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} else if (mod_len <= 512) {
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struct type50_meb3_msg *meb3 = ap_msg->message;
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memset(meb3, 0, sizeof(*meb3));
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ap_msg->length = sizeof(*meb3);
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meb3->header.msg_type_code = TYPE50_TYPE_CODE;
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meb3->header.msg_len = sizeof(*meb3);
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meb3->keyblock_type = TYPE50_MEB3_FMT;
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mod = meb3->modulus + sizeof(meb3->modulus) - mod_len;
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exp = meb3->exponent + sizeof(meb3->exponent) - mod_len;
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inp = meb3->message + sizeof(meb3->message) - mod_len;
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} else
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return -EINVAL;
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if (copy_from_user(mod, mex->n_modulus, mod_len) ||
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copy_from_user(exp, mex->b_key, mod_len) ||
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copy_from_user(inp, mex->inputdata, mod_len))
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return -EFAULT;
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return 0;
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}
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/**
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* Convert a ICACRT message to a type50 CRT message.
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*
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* @zq: crypto queue pointer
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* @ap_msg: crypto request pointer
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* @crt: pointer to user input data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_queue *zq,
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struct ap_message *ap_msg,
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struct ica_rsa_modexpo_crt *crt)
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{
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int mod_len, short_len;
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unsigned char *p, *q, *dp, *dq, *u, *inp;
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mod_len = crt->inputdatalength;
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short_len = (mod_len + 1) / 2;
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/*
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* CEX2A and CEX3A w/o FW update can handle requests up to
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* 256 byte modulus (2k keys).
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* CEX3A with FW update and newer CEXxA cards are able to handle
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* 512 byte modulus (4k keys).
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*/
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if (mod_len <= 128) { /* up to 1024 bit key size */
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struct type50_crb1_msg *crb1 = ap_msg->message;
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memset(crb1, 0, sizeof(*crb1));
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ap_msg->length = sizeof(*crb1);
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crb1->header.msg_type_code = TYPE50_TYPE_CODE;
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crb1->header.msg_len = sizeof(*crb1);
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crb1->keyblock_type = TYPE50_CRB1_FMT;
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p = crb1->p + sizeof(crb1->p) - short_len;
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q = crb1->q + sizeof(crb1->q) - short_len;
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dp = crb1->dp + sizeof(crb1->dp) - short_len;
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dq = crb1->dq + sizeof(crb1->dq) - short_len;
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u = crb1->u + sizeof(crb1->u) - short_len;
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inp = crb1->message + sizeof(crb1->message) - mod_len;
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} else if (mod_len <= 256) { /* up to 2048 bit key size */
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struct type50_crb2_msg *crb2 = ap_msg->message;
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memset(crb2, 0, sizeof(*crb2));
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ap_msg->length = sizeof(*crb2);
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crb2->header.msg_type_code = TYPE50_TYPE_CODE;
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crb2->header.msg_len = sizeof(*crb2);
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crb2->keyblock_type = TYPE50_CRB2_FMT;
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p = crb2->p + sizeof(crb2->p) - short_len;
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q = crb2->q + sizeof(crb2->q) - short_len;
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dp = crb2->dp + sizeof(crb2->dp) - short_len;
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dq = crb2->dq + sizeof(crb2->dq) - short_len;
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u = crb2->u + sizeof(crb2->u) - short_len;
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inp = crb2->message + sizeof(crb2->message) - mod_len;
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} else if ((mod_len <= 512) && /* up to 4096 bit key size */
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(zq->zcard->max_mod_size == CEX3A_MAX_MOD_SIZE)) {
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struct type50_crb3_msg *crb3 = ap_msg->message;
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memset(crb3, 0, sizeof(*crb3));
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ap_msg->length = sizeof(*crb3);
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crb3->header.msg_type_code = TYPE50_TYPE_CODE;
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crb3->header.msg_len = sizeof(*crb3);
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crb3->keyblock_type = TYPE50_CRB3_FMT;
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p = crb3->p + sizeof(crb3->p) - short_len;
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q = crb3->q + sizeof(crb3->q) - short_len;
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dp = crb3->dp + sizeof(crb3->dp) - short_len;
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dq = crb3->dq + sizeof(crb3->dq) - short_len;
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u = crb3->u + sizeof(crb3->u) - short_len;
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inp = crb3->message + sizeof(crb3->message) - mod_len;
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} else
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return -EINVAL;
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/*
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* correct the offset of p, bp and mult_inv according zcrypt.h
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* block size right aligned (skip the first byte)
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*/
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if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) ||
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copy_from_user(q, crt->nq_prime, short_len) ||
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copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) ||
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copy_from_user(dq, crt->bq_key, short_len) ||
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copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) ||
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copy_from_user(inp, crt->inputdata, mod_len))
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return -EFAULT;
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return 0;
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}
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/**
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* Copy results from a type 80 reply message back to user space.
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*
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* @zq: crypto device pointer
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* @reply: reply AP message.
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* @data: pointer to user output data
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* @length: size of user output data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int convert_type80(struct zcrypt_queue *zq,
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struct ap_message *reply,
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char __user *outputdata,
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unsigned int outputdatalength)
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{
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struct type80_hdr *t80h = reply->message;
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unsigned char *data;
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if (t80h->len < sizeof(*t80h) + outputdatalength) {
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/* The result is too short, the CEXxA card may not do that.. */
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zq->online = 0;
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pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
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AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid));
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ZCRYPT_DBF(DBF_ERR,
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"device=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n",
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AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid),
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t80h->code);
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return -EAGAIN; /* repeat the request on a different device. */
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}
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if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
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BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
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else
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BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE);
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data = reply->message + t80h->len - outputdatalength;
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if (copy_to_user(outputdata, data, outputdatalength))
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return -EFAULT;
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return 0;
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}
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static int convert_response(struct zcrypt_queue *zq,
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struct ap_message *reply,
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char __user *outputdata,
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unsigned int outputdatalength)
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{
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/* Response type byte is the second byte in the response. */
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unsigned char rtype = ((unsigned char *) reply->message)[1];
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switch (rtype) {
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case TYPE82_RSP_CODE:
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case TYPE88_RSP_CODE:
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return convert_error(zq, reply);
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case TYPE80_RSP_CODE:
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return convert_type80(zq, reply,
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outputdata, outputdatalength);
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default: /* Unknown response type, this should NEVER EVER happen */
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zq->online = 0;
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pr_err("Cryptographic device %02x.%04x failed and was set offline\n",
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AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid));
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ZCRYPT_DBF(DBF_ERR,
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"device=%02x.%04x rtype=0x%02x => online=0 rc=EAGAIN\n",
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AP_QID_CARD(zq->queue->qid),
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AP_QID_QUEUE(zq->queue->qid),
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(unsigned int) rtype);
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return -EAGAIN; /* repeat the request on a different device. */
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}
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}
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/**
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* This function is called from the AP bus code after a crypto request
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* "msg" has finished with the reply message "reply".
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* It is called from tasklet context.
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* @aq: pointer to the AP device
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* @msg: pointer to the AP message
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* @reply: pointer to the AP reply message
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*/
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static void zcrypt_cex2a_receive(struct ap_queue *aq,
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struct ap_message *msg,
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struct ap_message *reply)
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{
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static struct error_hdr error_reply = {
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.type = TYPE82_RSP_CODE,
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.reply_code = REP82_ERROR_MACHINE_FAILURE,
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};
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struct type80_hdr *t80h;
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int length;
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/* Copy the reply message to the request message buffer. */
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if (!reply)
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goto out; /* ap_msg->rc indicates the error */
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t80h = reply->message;
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if (t80h->type == TYPE80_RSP_CODE) {
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if (aq->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A)
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length = min_t(int,
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CEX2A_MAX_RESPONSE_SIZE, t80h->len);
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else
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length = min_t(int,
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CEX3A_MAX_RESPONSE_SIZE, t80h->len);
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memcpy(msg->message, reply->message, length);
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} else
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memcpy(msg->message, reply->message, sizeof(error_reply));
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out:
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complete((struct completion *) msg->private);
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}
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static atomic_t zcrypt_step = ATOMIC_INIT(0);
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/**
|
|
* The request distributor calls this function if it picked the CEXxA
|
|
* device to handle a modexpo request.
|
|
* @zq: pointer to zcrypt_queue structure that identifies the
|
|
* CEXxA device to the request distributor
|
|
* @mex: pointer to the modexpo request buffer
|
|
*/
|
|
static long zcrypt_cex2a_modexpo(struct zcrypt_queue *zq,
|
|
struct ica_rsa_modexpo *mex)
|
|
{
|
|
struct ap_message ap_msg;
|
|
struct completion work;
|
|
int rc;
|
|
|
|
ap_init_message(&ap_msg);
|
|
if (zq->zcard->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(zq, &ap_msg, mex);
|
|
if (rc)
|
|
goto out_free;
|
|
init_completion(&work);
|
|
ap_queue_message(zq->queue, &ap_msg);
|
|
rc = wait_for_completion_interruptible(&work);
|
|
if (rc == 0) {
|
|
rc = ap_msg.rc;
|
|
if (rc == 0)
|
|
rc = convert_response(zq, &ap_msg, mex->outputdata,
|
|
mex->outputdatalength);
|
|
} else
|
|
/* Signal pending. */
|
|
ap_cancel_message(zq->queue, &ap_msg);
|
|
out_free:
|
|
kfree(ap_msg.message);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* The request distributor calls this function if it picked the CEXxA
|
|
* device to handle a modexpo_crt request.
|
|
* @zq: pointer to zcrypt_queue structure that identifies the
|
|
* CEXxA device to the request distributor
|
|
* @crt: pointer to the modexpoc_crt request buffer
|
|
*/
|
|
static long zcrypt_cex2a_modexpo_crt(struct zcrypt_queue *zq,
|
|
struct ica_rsa_modexpo_crt *crt)
|
|
{
|
|
struct ap_message ap_msg;
|
|
struct completion work;
|
|
int rc;
|
|
|
|
ap_init_message(&ap_msg);
|
|
if (zq->zcard->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(zq, &ap_msg, crt);
|
|
if (rc)
|
|
goto out_free;
|
|
init_completion(&work);
|
|
ap_queue_message(zq->queue, &ap_msg);
|
|
rc = wait_for_completion_interruptible(&work);
|
|
if (rc == 0) {
|
|
rc = ap_msg.rc;
|
|
if (rc == 0)
|
|
rc = convert_response(zq, &ap_msg, crt->outputdata,
|
|
crt->outputdatalength);
|
|
} else
|
|
/* Signal pending. */
|
|
ap_cancel_message(zq->queue, &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,
|
|
.name = MSGTYPE50_NAME,
|
|
.variant = MSGTYPE50_VARIANT_DEFAULT,
|
|
};
|
|
|
|
void __init zcrypt_msgtype50_init(void)
|
|
{
|
|
zcrypt_msgtype_register(&zcrypt_msgtype50_ops);
|
|
}
|
|
|
|
void __exit zcrypt_msgtype50_exit(void)
|
|
{
|
|
zcrypt_msgtype_unregister(&zcrypt_msgtype50_ops);
|
|
}
|