diff options
Diffstat (limited to 'drivers/s390/crypto/zcrypt_msgtype50.c')
-rw-r--r-- | drivers/s390/crypto/zcrypt_msgtype50.c | 580 |
1 files changed, 580 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_msgtype50.c b/drivers/s390/crypto/zcrypt_msgtype50.c new file mode 100644 index 000000000..7d245645f --- /dev/null +++ b/drivers/s390/crypto/zcrypt_msgtype50.c @@ -0,0 +1,580 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * 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> + */ + +#define KMSG_COMPONENT "zcrypt" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#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" + +/* >= CEX3A: 4096 bits */ +#define CEX3A_MAX_MOD_SIZE 512 + +/* CEX2A: max outputdatalength + type80_hdr */ +#define CEX2A_MAX_RESPONSE_SIZE 0x110 + +/* >= CEX3A: 512 bit modulus, (max outputdatalength) + type80_hdr */ +#define CEX3A_MAX_RESPONSE_SIZE 0x210 + +MODULE_AUTHOR("IBM Corporation"); +MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \ + "Copyright IBM Corp. 2001, 2012"); +MODULE_LICENSE("GPL"); + +/* + * The type 50 message family is associated with a CEXxA cards. + * + * 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 CEXxA cards. + * + * 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; + +int get_rsa_modex_fc(struct ica_rsa_modexpo *mex, int *fcode) +{ + if (!mex->inputdatalength) + return -EINVAL; + + if (mex->inputdatalength <= 128) /* 1024 bit */ + *fcode = MEX_1K; + else if (mex->inputdatalength <= 256) /* 2048 bit */ + *fcode = MEX_2K; + else /* 4096 bit */ + *fcode = MEX_4K; + + return 0; +} + +int get_rsa_crt_fc(struct ica_rsa_modexpo_crt *crt, int *fcode) +{ + if (!crt->inputdatalength) + return -EINVAL; + + if (crt->inputdatalength <= 128) /* 1024 bit */ + *fcode = CRT_1K; + else if (crt->inputdatalength <= 256) /* 2048 bit */ + *fcode = CRT_2K; + else /* 4096 bit */ + *fcode = CRT_4K; + + return 0; +} + +/* + * Convert a ICAMEX message to a type50 MEX message. + * + * @zq: crypto queue pointer + * @ap_msg: crypto request pointer + * @mex: pointer to user input data + * + * Returns 0 on success or -EFAULT. + */ +static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_queue *zq, + 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->msg; + + memset(meb1, 0, sizeof(*meb1)); + ap_msg->len = 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->msg; + + memset(meb2, 0, sizeof(*meb2)); + ap_msg->len = 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 if (mod_len <= 512) { + struct type50_meb3_msg *meb3 = ap_msg->msg; + + memset(meb3, 0, sizeof(*meb3)); + ap_msg->len = 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; + } else { + return -EINVAL; + } + + 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; + +#ifdef CONFIG_ZCRYPT_DEBUG + if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL) + ap_msg->flags ^= AP_MSG_FLAG_SPECIAL; +#endif + + return 0; +} + +/* + * Convert a ICACRT message to a type50 CRT message. + * + * @zq: crypto queue pointer + * @ap_msg: crypto request pointer + * @crt: pointer to user input data + * + * Returns 0 on success or -EFAULT. + */ +static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_queue *zq, + struct ap_message *ap_msg, + struct ica_rsa_modexpo_crt *crt) +{ + int mod_len, short_len; + unsigned char *p, *q, *dp, *dq, *u, *inp; + + mod_len = crt->inputdatalength; + short_len = (mod_len + 1) / 2; + + /* + * CEX2A and CEX3A w/o FW update can handle requests up to + * 256 byte modulus (2k keys). + * CEX3A with FW update and newer CEXxA cards are able to handle + * 512 byte modulus (4k keys). + */ + if (mod_len <= 128) { /* up to 1024 bit key size */ + struct type50_crb1_msg *crb1 = ap_msg->msg; + + memset(crb1, 0, sizeof(*crb1)); + ap_msg->len = 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) - short_len; + q = crb1->q + sizeof(crb1->q) - short_len; + dp = crb1->dp + sizeof(crb1->dp) - short_len; + dq = crb1->dq + sizeof(crb1->dq) - short_len; + u = crb1->u + sizeof(crb1->u) - short_len; + inp = crb1->message + sizeof(crb1->message) - mod_len; + } else if (mod_len <= 256) { /* up to 2048 bit key size */ + struct type50_crb2_msg *crb2 = ap_msg->msg; + + memset(crb2, 0, sizeof(*crb2)); + ap_msg->len = 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) - short_len; + q = crb2->q + sizeof(crb2->q) - short_len; + dp = crb2->dp + sizeof(crb2->dp) - short_len; + dq = crb2->dq + sizeof(crb2->dq) - short_len; + u = crb2->u + sizeof(crb2->u) - short_len; + inp = crb2->message + sizeof(crb2->message) - mod_len; + } else if ((mod_len <= 512) && /* up to 4096 bit key size */ + (zq->zcard->max_mod_size == CEX3A_MAX_MOD_SIZE)) { + struct type50_crb3_msg *crb3 = ap_msg->msg; + + memset(crb3, 0, sizeof(*crb3)); + ap_msg->len = 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) - short_len; + q = crb3->q + sizeof(crb3->q) - short_len; + dp = crb3->dp + sizeof(crb3->dp) - short_len; + dq = crb3->dq + sizeof(crb3->dq) - short_len; + u = crb3->u + sizeof(crb3->u) - short_len; + inp = crb3->message + sizeof(crb3->message) - mod_len; + } else { + return -EINVAL; + } + + /* + * correct the offset of p, bp and mult_inv according zcrypt.h + * block size right aligned (skip the first byte) + */ + if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) || + copy_from_user(q, crt->nq_prime, short_len) || + copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) || + copy_from_user(dq, crt->bq_key, short_len) || + copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) || + copy_from_user(inp, crt->inputdata, mod_len)) + return -EFAULT; + +#ifdef CONFIG_ZCRYPT_DEBUG + if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL) + ap_msg->flags ^= AP_MSG_FLAG_SPECIAL; +#endif + + return 0; +} + +/* + * Copy results from a type 80 reply message back to user space. + * + * @zq: 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_queue *zq, + struct ap_message *reply, + char __user *outputdata, + unsigned int outputdatalength) +{ + struct type80_hdr *t80h = reply->msg; + unsigned char *data; + + if (t80h->len < sizeof(*t80h) + outputdatalength) { + /* The result is too short, the CEXxA card may not do that.. */ + zq->online = 0; + pr_err("Crypto dev=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), t80h->code); + ZCRYPT_DBF_ERR("%s dev=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n", + __func__, AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), t80h->code); + ap_send_online_uevent(&zq->queue->ap_dev, zq->online); + return -EAGAIN; + } + if (zq->zcard->user_space_type == ZCRYPT_CEX2A) + BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE); + else + BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE); + data = reply->msg + t80h->len - outputdatalength; + if (copy_to_user(outputdata, data, outputdatalength)) + return -EFAULT; + return 0; +} + +static int convert_response_cex2a(struct zcrypt_queue *zq, + struct ap_message *reply, + char __user *outputdata, + unsigned int outputdatalength) +{ + /* Response type byte is the second byte in the response. */ + unsigned char rtype = ((unsigned char *)reply->msg)[1]; + + switch (rtype) { + case TYPE82_RSP_CODE: + case TYPE88_RSP_CODE: + return convert_error(zq, reply); + case TYPE80_RSP_CODE: + return convert_type80(zq, reply, + outputdata, outputdatalength); + default: /* Unknown response type, this should NEVER EVER happen */ + zq->online = 0; + pr_err("Crypto dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n", + AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), + (int)rtype); + ZCRYPT_DBF_ERR( + "%s dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n", + __func__, AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), (int)rtype); + ap_send_online_uevent(&zq->queue->ap_dev, zq->online); + return -EAGAIN; + } +} + +/* + * 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. + * @aq: 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_queue *aq, + 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 len; + + /* Copy the reply message to the request message buffer. */ + if (!reply) + goto out; /* ap_msg->rc indicates the error */ + t80h = reply->msg; + if (t80h->type == TYPE80_RSP_CODE) { + len = t80h->len; + if (len > reply->bufsize || len > msg->bufsize) { + msg->rc = -EMSGSIZE; + } else { + memcpy(msg->msg, reply->msg, len); + msg->len = len; + } + } else { + memcpy(msg->msg, reply->msg, 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 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_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ? + MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE; + ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL); + if (!ap_msg->msg) + 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; + init_completion(&work); + rc = ap_queue_message(zq->queue, ap_msg); + if (rc) + goto out; + rc = wait_for_completion_interruptible(&work); + if (rc == 0) { + rc = ap_msg->rc; + if (rc == 0) + rc = convert_response_cex2a(zq, ap_msg, + mex->outputdata, + mex->outputdatalength); + } else { + /* Signal pending. */ + ap_cancel_message(zq->queue, ap_msg); + } + +out: + ap_msg->private = NULL; + if (rc) + ZCRYPT_DBF_DBG("%s send me cprb at dev=%02x.%04x rc=%d\n", + __func__, AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), rc); + 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_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ? + MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE; + ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL); + if (!ap_msg->msg) + 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; + init_completion(&work); + rc = ap_queue_message(zq->queue, ap_msg); + if (rc) + goto out; + rc = wait_for_completion_interruptible(&work); + if (rc == 0) { + rc = ap_msg->rc; + if (rc == 0) + rc = convert_response_cex2a(zq, ap_msg, + crt->outputdata, + crt->outputdatalength); + } else { + /* Signal pending. */ + ap_cancel_message(zq->queue, ap_msg); + } + +out: + ap_msg->private = NULL; + if (rc) + ZCRYPT_DBF_DBG("%s send crt cprb at dev=%02x.%04x rc=%d\n", + __func__, AP_QID_CARD(zq->queue->qid), + AP_QID_QUEUE(zq->queue->qid), rc); + 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); +} |