/* * linux/drivers/s390/crypto/zcrypt_pcica.c * * zcrypt 2.1.0 * * Copyright (C) 2001, 2006 IBM Corporation * 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> * * 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/init.h> #include <linux/err.h> #include <asm/atomic.h> #include <asm/uaccess.h> #include "ap_bus.h" #include "zcrypt_api.h" #include "zcrypt_error.h" #include "zcrypt_pcica.h" #define PCICA_MIN_MOD_SIZE 1 /* 8 bits */ #define PCICA_MAX_MOD_SIZE 256 /* 2048 bits */ #define PCICA_SPEED_RATING 2800 #define PCICA_MAX_MESSAGE_SIZE 0x3a0 /* sizeof(struct type4_lcr) */ #define PCICA_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */ #define PCICA_CLEANUP_TIME (15*HZ) static struct ap_device_id zcrypt_pcica_ids[] = { { AP_DEVICE(AP_DEVICE_TYPE_PCICA) }, { /* end of list */ }, }; #ifndef CONFIG_ZCRYPT_MONOLITHIC MODULE_DEVICE_TABLE(ap, zcrypt_pcica_ids); MODULE_AUTHOR("IBM Corporation"); MODULE_DESCRIPTION("PCICA Cryptographic Coprocessor device driver, " "Copyright 2001, 2006 IBM Corporation"); MODULE_LICENSE("GPL"); #endif static int zcrypt_pcica_probe(struct ap_device *ap_dev); static void zcrypt_pcica_remove(struct ap_device *ap_dev); static void zcrypt_pcica_receive(struct ap_device *, struct ap_message *, struct ap_message *); static struct ap_driver zcrypt_pcica_driver = { .probe = zcrypt_pcica_probe, .remove = zcrypt_pcica_remove, .receive = zcrypt_pcica_receive, .ids = zcrypt_pcica_ids, .request_timeout = PCICA_CLEANUP_TIME, }; /** * Convert a ICAMEX message to a type4 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_type4MEX_msg(struct zcrypt_device *zdev, struct ap_message *ap_msg, struct ica_rsa_modexpo *mex) { unsigned char *modulus, *exponent, *message; int mod_len; mod_len = mex->inputdatalength; if (mod_len <= 128) { struct type4_sme *sme = ap_msg->message; memset(sme, 0, sizeof(*sme)); ap_msg->length = sizeof(*sme); sme->header.msg_fmt = TYPE4_SME_FMT; sme->header.msg_len = sizeof(*sme); sme->header.msg_type_code = TYPE4_TYPE_CODE; sme->header.request_code = TYPE4_REQU_CODE; modulus = sme->modulus + sizeof(sme->modulus) - mod_len; exponent = sme->exponent + sizeof(sme->exponent) - mod_len; message = sme->message + sizeof(sme->message) - mod_len; } else { struct type4_lme *lme = ap_msg->message; memset(lme, 0, sizeof(*lme)); ap_msg->length = sizeof(*lme); lme->header.msg_fmt = TYPE4_LME_FMT; lme->header.msg_len = sizeof(*lme); lme->header.msg_type_code = TYPE4_TYPE_CODE; lme->header.request_code = TYPE4_REQU_CODE; modulus = lme->modulus + sizeof(lme->modulus) - mod_len; exponent = lme->exponent + sizeof(lme->exponent) - mod_len; message = lme->message + sizeof(lme->message) - mod_len; } if (copy_from_user(modulus, mex->n_modulus, mod_len) || copy_from_user(exponent, mex->b_key, mod_len) || copy_from_user(message, mex->inputdata, mod_len)) return -EFAULT; return 0; } /** * Convert a ICACRT message to a type4 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_type4CRT_msg(struct zcrypt_device *zdev, struct ap_message *ap_msg, struct ica_rsa_modexpo_crt *crt) { unsigned char *p, *q, *dp, *dq, *u, *inp; int mod_len, short_len, long_len; mod_len = crt->inputdatalength; short_len = mod_len / 2; long_len = mod_len / 2 + 8; if (mod_len <= 128) { struct type4_scr *scr = ap_msg->message; memset(scr, 0, sizeof(*scr)); ap_msg->length = sizeof(*scr); scr->header.msg_type_code = TYPE4_TYPE_CODE; scr->header.request_code = TYPE4_REQU_CODE; scr->header.msg_fmt = TYPE4_SCR_FMT; scr->header.msg_len = sizeof(*scr); p = scr->p + sizeof(scr->p) - long_len; q = scr->q + sizeof(scr->q) - short_len; dp = scr->dp + sizeof(scr->dp) - long_len; dq = scr->dq + sizeof(scr->dq) - short_len; u = scr->u + sizeof(scr->u) - long_len; inp = scr->message + sizeof(scr->message) - mod_len; } else { struct type4_lcr *lcr = ap_msg->message; memset(lcr, 0, sizeof(*lcr)); ap_msg->length = sizeof(*lcr); lcr->header.msg_type_code = TYPE4_TYPE_CODE; lcr->header.request_code = TYPE4_REQU_CODE; lcr->header.msg_fmt = TYPE4_LCR_FMT; lcr->header.msg_len = sizeof(*lcr); p = lcr->p + sizeof(lcr->p) - long_len; q = lcr->q + sizeof(lcr->q) - short_len; dp = lcr->dp + sizeof(lcr->dp) - long_len; dq = lcr->dq + sizeof(lcr->dq) - short_len; u = lcr->u + sizeof(lcr->u) - long_len; inp = lcr->message + sizeof(lcr->message) - mod_len; } if (copy_from_user(p, crt->np_prime, long_len) || copy_from_user(q, crt->nq_prime, short_len) || copy_from_user(dp, crt->bp_key, long_len) || copy_from_user(dq, crt->bq_key, short_len) || copy_from_user(u, crt->u_mult_inv, long_len) || copy_from_user(inp, crt->inputdata, mod_len)) return -EFAULT; return 0; } /** * Copy results from a type 84 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_type84(struct zcrypt_device *zdev, struct ap_message *reply, char __user *outputdata, unsigned int outputdatalength) { struct type84_hdr *t84h = reply->message; char *data; if (t84h->len < sizeof(*t84h) + outputdatalength) { /* The result is too short, the PCICA card may not do that.. */ zdev->online = 0; return -EAGAIN; /* repeat the request on a different device. */ } BUG_ON(t84h->len > PCICA_MAX_RESPONSE_SIZE); data = reply->message + t84h->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 TYPE84_RSP_CODE: return convert_type84(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_pcica_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 type84_hdr *t84h = reply->message; int length; /* Copy the reply message to the request message buffer. */ if (IS_ERR(reply)) memcpy(msg->message, &error_reply, sizeof(error_reply)); else if (t84h->code == TYPE84_RSP_CODE) { length = min(PCICA_MAX_RESPONSE_SIZE, (int) t84h->len); memcpy(msg->message, reply->message, length); } else memcpy(msg->message, reply->message, sizeof error_reply); complete((struct completion *) msg->private); } static atomic_t zcrypt_step = ATOMIC_INIT(0); /** * The request distributor calls this function if it picked the PCICA * device to handle a modexpo request. * @zdev: pointer to zcrypt_device structure that identifies the * PCICA device to the request distributor * @mex: pointer to the modexpo request buffer */ static long zcrypt_pcica_modexpo(struct zcrypt_device *zdev, struct ica_rsa_modexpo *mex) { struct ap_message ap_msg; struct completion work; int rc; ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL); if (!ap_msg.message) return -ENOMEM; ap_msg.psmid = (((unsigned long long) current->pid) << 32) + atomic_inc_return(&zcrypt_step); ap_msg.private = &work; rc = ICAMEX_msg_to_type4MEX_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 PCICA * device to handle a modexpo_crt request. * @zdev: pointer to zcrypt_device structure that identifies the * PCICA device to the request distributor * @crt: pointer to the modexpoc_crt request buffer */ static long zcrypt_pcica_modexpo_crt(struct zcrypt_device *zdev, struct ica_rsa_modexpo_crt *crt) { struct ap_message ap_msg; struct completion work; int rc; ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL); if (!ap_msg.message) return -ENOMEM; ap_msg.psmid = (((unsigned long long) current->pid) << 32) + atomic_inc_return(&zcrypt_step); ap_msg.private = &work; rc = ICACRT_msg_to_type4CRT_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 PCICA card. */ static struct zcrypt_ops zcrypt_pcica_ops = { .rsa_modexpo = zcrypt_pcica_modexpo, .rsa_modexpo_crt = zcrypt_pcica_modexpo_crt, }; /** * Probe function for PCICA cards. It always accepts the AP device * since the bus_match already checked the hardware type. * @ap_dev: pointer to the AP device. */ static int zcrypt_pcica_probe(struct ap_device *ap_dev) { struct zcrypt_device *zdev; int rc; zdev = zcrypt_device_alloc(PCICA_MAX_RESPONSE_SIZE); if (!zdev) return -ENOMEM; zdev->ap_dev = ap_dev; zdev->ops = &zcrypt_pcica_ops; zdev->online = 1; zdev->user_space_type = ZCRYPT_PCICA; zdev->type_string = "PCICA"; zdev->min_mod_size = PCICA_MIN_MOD_SIZE; zdev->max_mod_size = PCICA_MAX_MOD_SIZE; zdev->speed_rating = PCICA_SPEED_RATING; ap_dev->reply = &zdev->reply; ap_dev->private = zdev; rc = zcrypt_device_register(zdev); if (rc) goto out_free; return 0; out_free: ap_dev->private = NULL; zcrypt_device_free(zdev); return rc; } /** * This is called to remove the extended PCICA driver information * if an AP device is removed. */ static void zcrypt_pcica_remove(struct ap_device *ap_dev) { struct zcrypt_device *zdev = ap_dev->private; zcrypt_device_unregister(zdev); } int __init zcrypt_pcica_init(void) { return ap_driver_register(&zcrypt_pcica_driver, THIS_MODULE, "pcica"); } void zcrypt_pcica_exit(void) { ap_driver_unregister(&zcrypt_pcica_driver); } #ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(zcrypt_pcica_init); module_exit(zcrypt_pcica_exit); #endif