1767 lines
46 KiB
C
1767 lines
46 KiB
C
/*-
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* Linux port done by David McCullough <david_mccullough@mcafee.com>
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* Copyright (C) 2006-2010 David McCullough
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* Copyright (C) 2004-2005 Intel Corporation.
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* The license and original author are listed below.
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*
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* Redistribution and use in source and binary forms, with or without
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* Copyright (c) 2002-2006 Sam Leffler. All rights reserved.
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*
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if 0
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD: src/sys/opencrypto/crypto.c,v 1.27 2007/03/21 03:42:51 sam Exp $");
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#endif
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/*
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* Cryptographic Subsystem.
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*
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* This code is derived from the Openbsd Cryptographic Framework (OCF)
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* that has the copyright shown below. Very little of the original
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* code remains.
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*/
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/*-
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* The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
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*
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* This code was written by Angelos D. Keromytis in Athens, Greece, in
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* February 2000. Network Security Technologies Inc. (NSTI) kindly
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* supported the development of this code.
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*
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* Copyright (c) 2000, 2001 Angelos D. Keromytis
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all source code copies of any software which is or includes a copy or
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* modification of this software.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*
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__FBSDID("$FreeBSD: src/sys/opencrypto/crypto.c,v 1.16 2005/01/07 02:29:16 imp Exp $");
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*/
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#include <linux/version.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED)
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#include <linux/config.h>
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#endif
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/wait.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
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#include <linux/kthread.h>
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#endif
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#include <cryptodev.h>
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/*
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* keep track of whether or not we have been initialised, a big
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* issue if we are linked into the kernel and a driver gets started before
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* us
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*/
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static int crypto_initted = 0;
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/*
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* Crypto drivers register themselves by allocating a slot in the
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* crypto_drivers table with crypto_get_driverid() and then registering
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* each algorithm they support with crypto_register() and crypto_kregister().
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*/
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/*
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* lock on driver table
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* we track its state as spin_is_locked does not do anything on non-SMP boxes
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*/
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static spinlock_t crypto_drivers_lock;
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static int crypto_drivers_locked; /* for non-SMP boxes */
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#define CRYPTO_DRIVER_LOCK() \
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({ \
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spin_lock_irqsave(&crypto_drivers_lock, d_flags); \
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crypto_drivers_locked = 1; \
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dprintk("%s,%d: DRIVER_LOCK()\n", __FILE__, __LINE__); \
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})
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#define CRYPTO_DRIVER_UNLOCK() \
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({ \
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dprintk("%s,%d: DRIVER_UNLOCK()\n", __FILE__, __LINE__); \
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crypto_drivers_locked = 0; \
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spin_unlock_irqrestore(&crypto_drivers_lock, d_flags); \
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})
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#define CRYPTO_DRIVER_ASSERT() \
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({ \
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if (!crypto_drivers_locked) { \
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dprintk("%s,%d: DRIVER_ASSERT!\n", __FILE__, __LINE__); \
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} \
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})
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/*
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* Crypto device/driver capabilities structure.
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*
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* Synchronization:
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* (d) - protected by CRYPTO_DRIVER_LOCK()
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* (q) - protected by CRYPTO_Q_LOCK()
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* Not tagged fields are read-only.
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*/
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struct cryptocap {
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device_t cc_dev; /* (d) device/driver */
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u_int32_t cc_sessions; /* (d) # of sessions */
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u_int32_t cc_koperations; /* (d) # os asym operations */
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/*
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* Largest possible operator length (in bits) for each type of
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* encryption algorithm. XXX not used
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*/
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u_int16_t cc_max_op_len[CRYPTO_ALGORITHM_MAX + 1];
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u_int8_t cc_alg[CRYPTO_ALGORITHM_MAX + 1];
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u_int8_t cc_kalg[CRK_ALGORITHM_MAX + 1];
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int cc_flags; /* (d) flags */
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#define CRYPTOCAP_F_CLEANUP 0x80000000 /* needs resource cleanup */
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int cc_qblocked; /* (q) symmetric q blocked */
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int cc_kqblocked; /* (q) asymmetric q blocked */
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int cc_unqblocked; /* (q) symmetric q blocked */
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int cc_unkqblocked; /* (q) asymmetric q blocked */
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};
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static struct cryptocap *crypto_drivers = NULL;
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static int crypto_drivers_num = 0;
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/*
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* There are two queues for crypto requests; one for symmetric (e.g.
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* cipher) operations and one for asymmetric (e.g. MOD)operations.
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* A single mutex is used to lock access to both queues. We could
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* have one per-queue but having one simplifies handling of block/unblock
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* operations.
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*/
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static LIST_HEAD(crp_q); /* crypto request queue */
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static LIST_HEAD(crp_kq); /* asym request queue */
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static spinlock_t crypto_q_lock;
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int crypto_all_qblocked = 0; /* protect with Q_LOCK */
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module_param(crypto_all_qblocked, int, 0444);
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MODULE_PARM_DESC(crypto_all_qblocked, "Are all crypto queues blocked");
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int crypto_all_kqblocked = 0; /* protect with Q_LOCK */
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module_param(crypto_all_kqblocked, int, 0444);
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MODULE_PARM_DESC(crypto_all_kqblocked, "Are all asym crypto queues blocked");
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#define CRYPTO_Q_LOCK() \
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({ \
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spin_lock_irqsave(&crypto_q_lock, q_flags); \
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dprintk("%s,%d: Q_LOCK()\n", __FILE__, __LINE__); \
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})
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#define CRYPTO_Q_UNLOCK() \
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({ \
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dprintk("%s,%d: Q_UNLOCK()\n", __FILE__, __LINE__); \
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spin_unlock_irqrestore(&crypto_q_lock, q_flags); \
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})
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/*
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* There are two queues for processing completed crypto requests; one
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* for the symmetric and one for the asymmetric ops. We only need one
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* but have two to avoid type futzing (cryptop vs. cryptkop). A single
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* mutex is used to lock access to both queues. Note that this lock
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* must be separate from the lock on request queues to insure driver
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* callbacks don't generate lock order reversals.
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*/
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static LIST_HEAD(crp_ret_q); /* callback queues */
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static LIST_HEAD(crp_ret_kq);
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static spinlock_t crypto_ret_q_lock;
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#define CRYPTO_RETQ_LOCK() \
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({ \
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spin_lock_irqsave(&crypto_ret_q_lock, r_flags); \
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dprintk("%s,%d: RETQ_LOCK\n", __FILE__, __LINE__); \
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})
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#define CRYPTO_RETQ_UNLOCK() \
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({ \
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dprintk("%s,%d: RETQ_UNLOCK\n", __FILE__, __LINE__); \
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spin_unlock_irqrestore(&crypto_ret_q_lock, r_flags); \
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})
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#define CRYPTO_RETQ_EMPTY() (list_empty(&crp_ret_q) && list_empty(&crp_ret_kq))
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
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static kmem_cache_t *cryptop_zone;
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static kmem_cache_t *cryptodesc_zone;
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#else
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static struct kmem_cache *cryptop_zone;
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static struct kmem_cache *cryptodesc_zone;
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#endif
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#define debug crypto_debug
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int crypto_debug = 0;
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module_param(crypto_debug, int, 0644);
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MODULE_PARM_DESC(crypto_debug, "Enable debug");
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EXPORT_SYMBOL(crypto_debug);
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/*
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* Maximum number of outstanding crypto requests before we start
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* failing requests. We need this to prevent DOS when too many
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* requests are arriving for us to keep up. Otherwise we will
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* run the system out of memory. Since crypto is slow, we are
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* usually the bottleneck that needs to say, enough is enough.
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*
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* We cannot print errors when this condition occurs, we are already too
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* slow, printing anything will just kill us
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*/
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static int crypto_q_cnt = 0;
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module_param(crypto_q_cnt, int, 0444);
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MODULE_PARM_DESC(crypto_q_cnt,
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"Current number of outstanding crypto requests");
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static int crypto_q_max = 1000;
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module_param(crypto_q_max, int, 0644);
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MODULE_PARM_DESC(crypto_q_max,
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"Maximum number of outstanding crypto requests");
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#define bootverbose crypto_verbose
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static int crypto_verbose = 0;
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module_param(crypto_verbose, int, 0644);
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MODULE_PARM_DESC(crypto_verbose,
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"Enable verbose crypto startup");
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int crypto_usercrypto = 1; /* userland may do crypto reqs */
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module_param(crypto_usercrypto, int, 0644);
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MODULE_PARM_DESC(crypto_usercrypto,
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"Enable/disable user-mode access to crypto support");
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int crypto_userasymcrypto = 1; /* userland may do asym crypto reqs */
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module_param(crypto_userasymcrypto, int, 0644);
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MODULE_PARM_DESC(crypto_userasymcrypto,
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"Enable/disable user-mode access to asymmetric crypto support");
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int crypto_devallowsoft = 0; /* only use hardware crypto */
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module_param(crypto_devallowsoft, int, 0644);
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MODULE_PARM_DESC(crypto_devallowsoft,
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"Enable/disable use of software crypto support");
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/*
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* This parameter controls the maximum number of crypto operations to
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* do consecutively in the crypto kernel thread before scheduling to allow
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* other processes to run. Without it, it is possible to get into a
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* situation where the crypto thread never allows any other processes to run.
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* Default to 1000 which should be less than one second.
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*/
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static int crypto_max_loopcount = 1000;
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module_param(crypto_max_loopcount, int, 0644);
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MODULE_PARM_DESC(crypto_max_loopcount,
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"Maximum number of crypto ops to do before yielding to other processes");
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#ifndef CONFIG_NR_CPUS
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#define CONFIG_NR_CPUS 1
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#endif
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static struct task_struct *cryptoproc[CONFIG_NR_CPUS];
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static struct task_struct *cryptoretproc[CONFIG_NR_CPUS];
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static DECLARE_WAIT_QUEUE_HEAD(cryptoproc_wait);
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static DECLARE_WAIT_QUEUE_HEAD(cryptoretproc_wait);
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static int crypto_proc(void *arg);
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static int crypto_ret_proc(void *arg);
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static int crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint);
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static int crypto_kinvoke(struct cryptkop *krp, int flags);
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static void crypto_exit(void);
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static int crypto_init(void);
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static struct cryptostats cryptostats;
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static struct cryptocap *
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crypto_checkdriver(u_int32_t hid)
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{
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if (crypto_drivers == NULL)
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return NULL;
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return (hid >= crypto_drivers_num ? NULL : &crypto_drivers[hid]);
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}
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/*
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* Compare a driver's list of supported algorithms against another
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* list; return non-zero if all algorithms are supported.
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*/
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static int
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driver_suitable(const struct cryptocap *cap, const struct cryptoini *cri)
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{
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const struct cryptoini *cr;
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/* See if all the algorithms are supported. */
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for (cr = cri; cr; cr = cr->cri_next)
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if (cap->cc_alg[cr->cri_alg] == 0)
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return 0;
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return 1;
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}
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/*
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* Select a driver for a new session that supports the specified
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* algorithms and, optionally, is constrained according to the flags.
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* The algorithm we use here is pretty stupid; just use the
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* first driver that supports all the algorithms we need. If there
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* are multiple drivers we choose the driver with the fewest active
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* sessions. We prefer hardware-backed drivers to software ones.
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*
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* XXX We need more smarts here (in real life too, but that's
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* XXX another story altogether).
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*/
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static struct cryptocap *
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crypto_select_driver(const struct cryptoini *cri, int flags)
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{
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struct cryptocap *cap, *best;
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int match, hid;
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CRYPTO_DRIVER_ASSERT();
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/*
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* Look first for hardware crypto devices if permitted.
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*/
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if (flags & CRYPTOCAP_F_HARDWARE)
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match = CRYPTOCAP_F_HARDWARE;
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else
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match = CRYPTOCAP_F_SOFTWARE;
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best = NULL;
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again:
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for (hid = 0; hid < crypto_drivers_num; hid++) {
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cap = &crypto_drivers[hid];
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/*
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* If it's not initialized, is in the process of
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* going away, or is not appropriate (hardware
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* or software based on match), then skip.
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*/
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if (cap->cc_dev == NULL ||
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(cap->cc_flags & CRYPTOCAP_F_CLEANUP) ||
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(cap->cc_flags & match) == 0)
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continue;
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|
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/* verify all the algorithms are supported. */
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if (driver_suitable(cap, cri)) {
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if (best == NULL ||
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cap->cc_sessions < best->cc_sessions)
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best = cap;
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}
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}
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if (best != NULL)
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return best;
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if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) {
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/* sort of an Algol 68-style for loop */
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match = CRYPTOCAP_F_SOFTWARE;
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goto again;
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}
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return best;
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}
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|
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/*
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* Create a new session. The crid argument specifies a crypto
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* driver to use or constraints on a driver to select (hardware
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* only, software only, either). Whatever driver is selected
|
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* must be capable of the requested crypto algorithms.
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*/
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int
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crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int crid)
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{
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struct cryptocap *cap;
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u_int32_t hid, lid;
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int err;
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unsigned long d_flags;
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|
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CRYPTO_DRIVER_LOCK();
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if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
|
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/*
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* Use specified driver; verify it is capable.
|
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*/
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cap = crypto_checkdriver(crid);
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if (cap != NULL && !driver_suitable(cap, cri))
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cap = NULL;
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} else {
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/*
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* No requested driver; select based on crid flags.
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*/
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cap = crypto_select_driver(cri, crid);
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/*
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* if NULL then can't do everything in one session.
|
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* XXX Fix this. We need to inject a "virtual" session
|
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* XXX layer right about here.
|
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*/
|
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}
|
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if (cap != NULL) {
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/* Call the driver initialization routine. */
|
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hid = cap - crypto_drivers;
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lid = hid; /* Pass the driver ID. */
|
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cap->cc_sessions++;
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CRYPTO_DRIVER_UNLOCK();
|
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err = CRYPTODEV_NEWSESSION(cap->cc_dev, &lid, cri);
|
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CRYPTO_DRIVER_LOCK();
|
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if (err == 0) {
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(*sid) = (cap->cc_flags & 0xff000000)
|
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| (hid & 0x00ffffff);
|
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(*sid) <<= 32;
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(*sid) |= (lid & 0xffffffff);
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} else
|
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cap->cc_sessions--;
|
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} else
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err = EINVAL;
|
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CRYPTO_DRIVER_UNLOCK();
|
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return err;
|
|
}
|
|
|
|
static void
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crypto_remove(struct cryptocap *cap)
|
|
{
|
|
CRYPTO_DRIVER_ASSERT();
|
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if (cap->cc_sessions == 0 && cap->cc_koperations == 0)
|
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bzero(cap, sizeof(*cap));
|
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}
|
|
|
|
/*
|
|
* Delete an existing session (or a reserved session on an unregistered
|
|
* driver).
|
|
*/
|
|
int
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crypto_freesession(u_int64_t sid)
|
|
{
|
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struct cryptocap *cap;
|
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u_int32_t hid;
|
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int err = 0;
|
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unsigned long d_flags;
|
|
|
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dprintk("%s()\n", __FUNCTION__);
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CRYPTO_DRIVER_LOCK();
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|
|
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if (crypto_drivers == NULL) {
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err = EINVAL;
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goto done;
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}
|
|
|
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/* Determine two IDs. */
|
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hid = CRYPTO_SESID2HID(sid);
|
|
|
|
if (hid >= crypto_drivers_num) {
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dprintk("%s - INVALID DRIVER NUM %d\n", __FUNCTION__, hid);
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err = ENOENT;
|
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goto done;
|
|
}
|
|
cap = &crypto_drivers[hid];
|
|
|
|
if (cap->cc_dev) {
|
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CRYPTO_DRIVER_UNLOCK();
|
|
/* Call the driver cleanup routine, if available, unlocked. */
|
|
err = CRYPTODEV_FREESESSION(cap->cc_dev, sid);
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CRYPTO_DRIVER_LOCK();
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}
|
|
|
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if (cap->cc_sessions)
|
|
cap->cc_sessions--;
|
|
|
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if (cap->cc_flags & CRYPTOCAP_F_CLEANUP)
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crypto_remove(cap);
|
|
|
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done:
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Return an unused driver id. Used by drivers prior to registering
|
|
* support for the algorithms they handle.
|
|
*/
|
|
int32_t
|
|
crypto_get_driverid(device_t dev, int flags)
|
|
{
|
|
struct cryptocap *newdrv;
|
|
int i;
|
|
unsigned long d_flags;
|
|
|
|
if ((flags & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
|
|
printf("%s: no flags specified when registering driver\n",
|
|
device_get_nameunit(dev));
|
|
return -1;
|
|
}
|
|
|
|
CRYPTO_DRIVER_LOCK();
|
|
|
|
for (i = 0; i < crypto_drivers_num; i++) {
|
|
if (crypto_drivers[i].cc_dev == NULL &&
|
|
(crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Out of entries, allocate some more. */
|
|
if (i == crypto_drivers_num) {
|
|
/* Be careful about wrap-around. */
|
|
if (2 * crypto_drivers_num <= crypto_drivers_num) {
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
printk("crypto: driver count wraparound!\n");
|
|
return -1;
|
|
}
|
|
|
|
newdrv = kmalloc(2 * crypto_drivers_num * sizeof(struct cryptocap),
|
|
GFP_KERNEL);
|
|
if (newdrv == NULL) {
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
printk("crypto: no space to expand driver table!\n");
|
|
return -1;
|
|
}
|
|
|
|
memcpy(newdrv, crypto_drivers,
|
|
crypto_drivers_num * sizeof(struct cryptocap));
|
|
memset(&newdrv[crypto_drivers_num], 0,
|
|
crypto_drivers_num * sizeof(struct cryptocap));
|
|
|
|
crypto_drivers_num *= 2;
|
|
|
|
kfree(crypto_drivers);
|
|
crypto_drivers = newdrv;
|
|
}
|
|
|
|
/* NB: state is zero'd on free */
|
|
crypto_drivers[i].cc_sessions = 1; /* Mark */
|
|
crypto_drivers[i].cc_dev = dev;
|
|
crypto_drivers[i].cc_flags = flags;
|
|
if (bootverbose)
|
|
printf("crypto: assign %s driver id %u, flags %u\n",
|
|
device_get_nameunit(dev), i, flags);
|
|
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* Lookup a driver by name. We match against the full device
|
|
* name and unit, and against just the name. The latter gives
|
|
* us a simple widlcarding by device name. On success return the
|
|
* driver/hardware identifier; otherwise return -1.
|
|
*/
|
|
int
|
|
crypto_find_driver(const char *match)
|
|
{
|
|
int i, len = strlen(match);
|
|
unsigned long d_flags;
|
|
|
|
CRYPTO_DRIVER_LOCK();
|
|
for (i = 0; i < crypto_drivers_num; i++) {
|
|
device_t dev = crypto_drivers[i].cc_dev;
|
|
if (dev == NULL ||
|
|
(crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP))
|
|
continue;
|
|
if (strncmp(match, device_get_nameunit(dev), len) == 0 ||
|
|
strncmp(match, device_get_name(dev), len) == 0)
|
|
break;
|
|
}
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
return i < crypto_drivers_num ? i : -1;
|
|
}
|
|
|
|
/*
|
|
* Return the device_t for the specified driver or NULL
|
|
* if the driver identifier is invalid.
|
|
*/
|
|
device_t
|
|
crypto_find_device_byhid(int hid)
|
|
{
|
|
struct cryptocap *cap = crypto_checkdriver(hid);
|
|
return cap != NULL ? cap->cc_dev : NULL;
|
|
}
|
|
|
|
/*
|
|
* Return the device/driver capabilities.
|
|
*/
|
|
int
|
|
crypto_getcaps(int hid)
|
|
{
|
|
struct cryptocap *cap = crypto_checkdriver(hid);
|
|
return cap != NULL ? cap->cc_flags : 0;
|
|
}
|
|
|
|
/*
|
|
* Register support for a key-related algorithm. This routine
|
|
* is called once for each algorithm supported a driver.
|
|
*/
|
|
int
|
|
crypto_kregister(u_int32_t driverid, int kalg, u_int32_t flags)
|
|
{
|
|
struct cryptocap *cap;
|
|
int err;
|
|
unsigned long d_flags;
|
|
|
|
dprintk("%s()\n", __FUNCTION__);
|
|
CRYPTO_DRIVER_LOCK();
|
|
|
|
cap = crypto_checkdriver(driverid);
|
|
if (cap != NULL &&
|
|
(CRK_ALGORITM_MIN <= kalg && kalg <= CRK_ALGORITHM_MAX)) {
|
|
/*
|
|
* XXX Do some performance testing to determine placing.
|
|
* XXX We probably need an auxiliary data structure that
|
|
* XXX describes relative performances.
|
|
*/
|
|
|
|
cap->cc_kalg[kalg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
|
|
if (bootverbose)
|
|
printf("crypto: %s registers key alg %u flags %u\n"
|
|
, device_get_nameunit(cap->cc_dev)
|
|
, kalg
|
|
, flags
|
|
);
|
|
err = 0;
|
|
} else
|
|
err = EINVAL;
|
|
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Register support for a non-key-related algorithm. This routine
|
|
* is called once for each such algorithm supported by a driver.
|
|
*/
|
|
int
|
|
crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
|
|
u_int32_t flags)
|
|
{
|
|
struct cryptocap *cap;
|
|
int err;
|
|
unsigned long d_flags;
|
|
|
|
dprintk("%s(id=0x%x, alg=%d, maxoplen=%d, flags=0x%x)\n", __FUNCTION__,
|
|
driverid, alg, maxoplen, flags);
|
|
|
|
CRYPTO_DRIVER_LOCK();
|
|
|
|
cap = crypto_checkdriver(driverid);
|
|
/* NB: algorithms are in the range [1..max] */
|
|
if (cap != NULL &&
|
|
(CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX)) {
|
|
/*
|
|
* XXX Do some performance testing to determine placing.
|
|
* XXX We probably need an auxiliary data structure that
|
|
* XXX describes relative performances.
|
|
*/
|
|
|
|
cap->cc_alg[alg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
|
|
cap->cc_max_op_len[alg] = maxoplen;
|
|
if (bootverbose)
|
|
printf("crypto: %s registers alg %u flags %u maxoplen %u\n"
|
|
, device_get_nameunit(cap->cc_dev)
|
|
, alg
|
|
, flags
|
|
, maxoplen
|
|
);
|
|
cap->cc_sessions = 0; /* Unmark */
|
|
err = 0;
|
|
} else
|
|
err = EINVAL;
|
|
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
driver_finis(struct cryptocap *cap)
|
|
{
|
|
u_int32_t ses, kops;
|
|
|
|
CRYPTO_DRIVER_ASSERT();
|
|
|
|
ses = cap->cc_sessions;
|
|
kops = cap->cc_koperations;
|
|
bzero(cap, sizeof(*cap));
|
|
if (ses != 0 || kops != 0) {
|
|
/*
|
|
* If there are pending sessions,
|
|
* just mark as invalid.
|
|
*/
|
|
cap->cc_flags |= CRYPTOCAP_F_CLEANUP;
|
|
cap->cc_sessions = ses;
|
|
cap->cc_koperations = kops;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unregister a crypto driver. If there are pending sessions using it,
|
|
* leave enough information around so that subsequent calls using those
|
|
* sessions will correctly detect the driver has been unregistered and
|
|
* reroute requests.
|
|
*/
|
|
int
|
|
crypto_unregister(u_int32_t driverid, int alg)
|
|
{
|
|
struct cryptocap *cap;
|
|
int i, err;
|
|
unsigned long d_flags;
|
|
|
|
dprintk("%s()\n", __FUNCTION__);
|
|
CRYPTO_DRIVER_LOCK();
|
|
|
|
cap = crypto_checkdriver(driverid);
|
|
if (cap != NULL &&
|
|
(CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX) &&
|
|
cap->cc_alg[alg] != 0) {
|
|
cap->cc_alg[alg] = 0;
|
|
cap->cc_max_op_len[alg] = 0;
|
|
|
|
/* Was this the last algorithm ? */
|
|
for (i = 1; i <= CRYPTO_ALGORITHM_MAX; i++)
|
|
if (cap->cc_alg[i] != 0)
|
|
break;
|
|
|
|
if (i == CRYPTO_ALGORITHM_MAX + 1)
|
|
driver_finis(cap);
|
|
err = 0;
|
|
} else
|
|
err = EINVAL;
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Unregister all algorithms associated with a crypto driver.
|
|
* If there are pending sessions using it, leave enough information
|
|
* around so that subsequent calls using those sessions will
|
|
* correctly detect the driver has been unregistered and reroute
|
|
* requests.
|
|
*/
|
|
int
|
|
crypto_unregister_all(u_int32_t driverid)
|
|
{
|
|
struct cryptocap *cap;
|
|
int err;
|
|
unsigned long d_flags;
|
|
|
|
dprintk("%s()\n", __FUNCTION__);
|
|
CRYPTO_DRIVER_LOCK();
|
|
cap = crypto_checkdriver(driverid);
|
|
if (cap != NULL) {
|
|
driver_finis(cap);
|
|
err = 0;
|
|
} else
|
|
err = EINVAL;
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Clear blockage on a driver. The what parameter indicates whether
|
|
* the driver is now ready for cryptop's and/or cryptokop's.
|
|
*/
|
|
int
|
|
crypto_unblock(u_int32_t driverid, int what)
|
|
{
|
|
struct cryptocap *cap;
|
|
int err;
|
|
unsigned long q_flags;
|
|
|
|
CRYPTO_Q_LOCK();
|
|
cap = crypto_checkdriver(driverid);
|
|
if (cap != NULL) {
|
|
if (what & CRYPTO_SYMQ) {
|
|
cap->cc_qblocked = 0;
|
|
cap->cc_unqblocked = 0;
|
|
crypto_all_qblocked = 0;
|
|
}
|
|
if (what & CRYPTO_ASYMQ) {
|
|
cap->cc_kqblocked = 0;
|
|
cap->cc_unkqblocked = 0;
|
|
crypto_all_kqblocked = 0;
|
|
}
|
|
wake_up_interruptible(&cryptoproc_wait);
|
|
err = 0;
|
|
} else
|
|
err = EINVAL;
|
|
CRYPTO_Q_UNLOCK(); //DAVIDM should this be a driver lock
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Add a crypto request to a queue, to be processed by the kernel thread.
|
|
*/
|
|
int
|
|
crypto_dispatch(struct cryptop *crp)
|
|
{
|
|
struct cryptocap *cap;
|
|
int result = -1;
|
|
unsigned long q_flags;
|
|
|
|
dprintk("%s()\n", __FUNCTION__);
|
|
|
|
cryptostats.cs_ops++;
|
|
|
|
CRYPTO_Q_LOCK();
|
|
if (crypto_q_cnt >= crypto_q_max) {
|
|
cryptostats.cs_drops++;
|
|
CRYPTO_Q_UNLOCK();
|
|
return ENOMEM;
|
|
}
|
|
crypto_q_cnt++;
|
|
|
|
/* make sure we are starting a fresh run on this crp. */
|
|
crp->crp_flags &= ~CRYPTO_F_DONE;
|
|
crp->crp_etype = 0;
|
|
|
|
/*
|
|
* Caller marked the request to be processed immediately; dispatch
|
|
* it directly to the driver unless the driver is currently blocked.
|
|
*/
|
|
if ((crp->crp_flags & CRYPTO_F_BATCH) == 0) {
|
|
int hid = CRYPTO_SESID2HID(crp->crp_sid);
|
|
cap = crypto_checkdriver(hid);
|
|
/* Driver cannot disappear when there is an active session. */
|
|
KASSERT(cap != NULL, ("%s: Driver disappeared.", __func__));
|
|
if (!cap->cc_qblocked) {
|
|
crypto_all_qblocked = 0;
|
|
crypto_drivers[hid].cc_unqblocked = 1;
|
|
CRYPTO_Q_UNLOCK();
|
|
result = crypto_invoke(cap, crp, 0);
|
|
CRYPTO_Q_LOCK();
|
|
if (result == ERESTART)
|
|
if (crypto_drivers[hid].cc_unqblocked)
|
|
crypto_drivers[hid].cc_qblocked = 1;
|
|
crypto_drivers[hid].cc_unqblocked = 0;
|
|
}
|
|
}
|
|
if (result == ERESTART) {
|
|
/*
|
|
* The driver ran out of resources, mark the
|
|
* driver ``blocked'' for cryptop's and put
|
|
* the request back in the queue. It would
|
|
* best to put the request back where we got
|
|
* it but that's hard so for now we put it
|
|
* at the front. This should be ok; putting
|
|
* it at the end does not work.
|
|
*/
|
|
list_add(&crp->crp_next, &crp_q);
|
|
cryptostats.cs_blocks++;
|
|
result = 0;
|
|
} else if (result == -1) {
|
|
TAILQ_INSERT_TAIL(&crp_q, crp, crp_next);
|
|
result = 0;
|
|
}
|
|
wake_up_interruptible(&cryptoproc_wait);
|
|
CRYPTO_Q_UNLOCK();
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Add an asymetric crypto request to a queue,
|
|
* to be processed by the kernel thread.
|
|
*/
|
|
int
|
|
crypto_kdispatch(struct cryptkop *krp)
|
|
{
|
|
int error;
|
|
unsigned long q_flags;
|
|
|
|
cryptostats.cs_kops++;
|
|
|
|
error = crypto_kinvoke(krp, krp->krp_crid);
|
|
if (error == ERESTART) {
|
|
CRYPTO_Q_LOCK();
|
|
TAILQ_INSERT_TAIL(&crp_kq, krp, krp_next);
|
|
wake_up_interruptible(&cryptoproc_wait);
|
|
CRYPTO_Q_UNLOCK();
|
|
error = 0;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Verify a driver is suitable for the specified operation.
|
|
*/
|
|
static __inline int
|
|
kdriver_suitable(const struct cryptocap *cap, const struct cryptkop *krp)
|
|
{
|
|
return (cap->cc_kalg[krp->krp_op] & CRYPTO_ALG_FLAG_SUPPORTED) != 0;
|
|
}
|
|
|
|
/*
|
|
* Select a driver for an asym operation. The driver must
|
|
* support the necessary algorithm. The caller can constrain
|
|
* which device is selected with the flags parameter. The
|
|
* algorithm we use here is pretty stupid; just use the first
|
|
* driver that supports the algorithms we need. If there are
|
|
* multiple suitable drivers we choose the driver with the
|
|
* fewest active operations. We prefer hardware-backed
|
|
* drivers to software ones when either may be used.
|
|
*/
|
|
static struct cryptocap *
|
|
crypto_select_kdriver(const struct cryptkop *krp, int flags)
|
|
{
|
|
struct cryptocap *cap, *best, *blocked;
|
|
int match, hid;
|
|
|
|
CRYPTO_DRIVER_ASSERT();
|
|
|
|
/*
|
|
* Look first for hardware crypto devices if permitted.
|
|
*/
|
|
if (flags & CRYPTOCAP_F_HARDWARE)
|
|
match = CRYPTOCAP_F_HARDWARE;
|
|
else
|
|
match = CRYPTOCAP_F_SOFTWARE;
|
|
best = NULL;
|
|
blocked = NULL;
|
|
again:
|
|
for (hid = 0; hid < crypto_drivers_num; hid++) {
|
|
cap = &crypto_drivers[hid];
|
|
/*
|
|
* If it's not initialized, is in the process of
|
|
* going away, or is not appropriate (hardware
|
|
* or software based on match), then skip.
|
|
*/
|
|
if (cap->cc_dev == NULL ||
|
|
(cap->cc_flags & CRYPTOCAP_F_CLEANUP) ||
|
|
(cap->cc_flags & match) == 0)
|
|
continue;
|
|
|
|
/* verify all the algorithms are supported. */
|
|
if (kdriver_suitable(cap, krp)) {
|
|
if (best == NULL ||
|
|
cap->cc_koperations < best->cc_koperations)
|
|
best = cap;
|
|
}
|
|
}
|
|
if (best != NULL)
|
|
return best;
|
|
if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) {
|
|
/* sort of an Algol 68-style for loop */
|
|
match = CRYPTOCAP_F_SOFTWARE;
|
|
goto again;
|
|
}
|
|
return best;
|
|
}
|
|
|
|
/*
|
|
* Dispatch an assymetric crypto request.
|
|
*/
|
|
static int
|
|
crypto_kinvoke(struct cryptkop *krp, int crid)
|
|
{
|
|
struct cryptocap *cap = NULL;
|
|
int error;
|
|
unsigned long d_flags;
|
|
|
|
KASSERT(krp != NULL, ("%s: krp == NULL", __func__));
|
|
KASSERT(krp->krp_callback != NULL,
|
|
("%s: krp->crp_callback == NULL", __func__));
|
|
|
|
CRYPTO_DRIVER_LOCK();
|
|
if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
|
|
cap = crypto_checkdriver(crid);
|
|
if (cap != NULL) {
|
|
/*
|
|
* Driver present, it must support the necessary
|
|
* algorithm and, if s/w drivers are excluded,
|
|
* it must be registered as hardware-backed.
|
|
*/
|
|
if (!kdriver_suitable(cap, krp) ||
|
|
(!crypto_devallowsoft &&
|
|
(cap->cc_flags & CRYPTOCAP_F_HARDWARE) == 0))
|
|
cap = NULL;
|
|
}
|
|
} else {
|
|
/*
|
|
* No requested driver; select based on crid flags.
|
|
*/
|
|
if (!crypto_devallowsoft) /* NB: disallow s/w drivers */
|
|
crid &= ~CRYPTOCAP_F_SOFTWARE;
|
|
cap = crypto_select_kdriver(krp, crid);
|
|
}
|
|
if (cap != NULL && !cap->cc_kqblocked) {
|
|
krp->krp_hid = cap - crypto_drivers;
|
|
cap->cc_koperations++;
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
error = CRYPTODEV_KPROCESS(cap->cc_dev, krp, 0);
|
|
CRYPTO_DRIVER_LOCK();
|
|
if (error == ERESTART) {
|
|
cap->cc_koperations--;
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
return (error);
|
|
}
|
|
/* return the actual device used */
|
|
krp->krp_crid = krp->krp_hid;
|
|
} else {
|
|
/*
|
|
* NB: cap is !NULL if device is blocked; in
|
|
* that case return ERESTART so the operation
|
|
* is resubmitted if possible.
|
|
*/
|
|
error = (cap == NULL) ? ENODEV : ERESTART;
|
|
}
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
|
|
if (error) {
|
|
krp->krp_status = error;
|
|
crypto_kdone(krp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Dispatch a crypto request to the appropriate crypto devices.
|
|
*/
|
|
static int
|
|
crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint)
|
|
{
|
|
KASSERT(crp != NULL, ("%s: crp == NULL", __func__));
|
|
KASSERT(crp->crp_callback != NULL,
|
|
("%s: crp->crp_callback == NULL", __func__));
|
|
KASSERT(crp->crp_desc != NULL, ("%s: crp->crp_desc == NULL", __func__));
|
|
|
|
dprintk("%s()\n", __FUNCTION__);
|
|
|
|
#ifdef CRYPTO_TIMING
|
|
if (crypto_timing)
|
|
crypto_tstat(&cryptostats.cs_invoke, &crp->crp_tstamp);
|
|
#endif
|
|
if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) {
|
|
struct cryptodesc *crd;
|
|
u_int64_t nid;
|
|
|
|
/*
|
|
* Driver has unregistered; migrate the session and return
|
|
* an error to the caller so they'll resubmit the op.
|
|
*
|
|
* XXX: What if there are more already queued requests for this
|
|
* session?
|
|
*/
|
|
crypto_freesession(crp->crp_sid);
|
|
|
|
for (crd = crp->crp_desc; crd->crd_next; crd = crd->crd_next)
|
|
crd->CRD_INI.cri_next = &(crd->crd_next->CRD_INI);
|
|
|
|
/* XXX propagate flags from initial session? */
|
|
if (crypto_newsession(&nid, &(crp->crp_desc->CRD_INI),
|
|
CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE) == 0)
|
|
crp->crp_sid = nid;
|
|
|
|
crp->crp_etype = EAGAIN;
|
|
crypto_done(crp);
|
|
return 0;
|
|
} else {
|
|
/*
|
|
* Invoke the driver to process the request.
|
|
*/
|
|
return CRYPTODEV_PROCESS(cap->cc_dev, crp, hint);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Release a set of crypto descriptors.
|
|
*/
|
|
void
|
|
crypto_freereq(struct cryptop *crp)
|
|
{
|
|
struct cryptodesc *crd;
|
|
|
|
if (crp == NULL)
|
|
return;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
{
|
|
struct cryptop *crp2;
|
|
unsigned long q_flags;
|
|
|
|
CRYPTO_Q_LOCK();
|
|
TAILQ_FOREACH(crp2, &crp_q, crp_next) {
|
|
KASSERT(crp2 != crp,
|
|
("Freeing cryptop from the crypto queue (%p).",
|
|
crp));
|
|
}
|
|
CRYPTO_Q_UNLOCK();
|
|
CRYPTO_RETQ_LOCK();
|
|
TAILQ_FOREACH(crp2, &crp_ret_q, crp_next) {
|
|
KASSERT(crp2 != crp,
|
|
("Freeing cryptop from the return queue (%p).",
|
|
crp));
|
|
}
|
|
CRYPTO_RETQ_UNLOCK();
|
|
}
|
|
#endif
|
|
|
|
while ((crd = crp->crp_desc) != NULL) {
|
|
crp->crp_desc = crd->crd_next;
|
|
kmem_cache_free(cryptodesc_zone, crd);
|
|
}
|
|
kmem_cache_free(cryptop_zone, crp);
|
|
}
|
|
|
|
/*
|
|
* Acquire a set of crypto descriptors.
|
|
*/
|
|
struct cryptop *
|
|
crypto_getreq(int num)
|
|
{
|
|
struct cryptodesc *crd;
|
|
struct cryptop *crp;
|
|
|
|
crp = kmem_cache_alloc(cryptop_zone, SLAB_ATOMIC);
|
|
if (crp != NULL) {
|
|
memset(crp, 0, sizeof(*crp));
|
|
INIT_LIST_HEAD(&crp->crp_next);
|
|
init_waitqueue_head(&crp->crp_waitq);
|
|
while (num--) {
|
|
crd = kmem_cache_alloc(cryptodesc_zone, SLAB_ATOMIC);
|
|
if (crd == NULL) {
|
|
crypto_freereq(crp);
|
|
return NULL;
|
|
}
|
|
memset(crd, 0, sizeof(*crd));
|
|
crd->crd_next = crp->crp_desc;
|
|
crp->crp_desc = crd;
|
|
}
|
|
}
|
|
return crp;
|
|
}
|
|
|
|
/*
|
|
* Invoke the callback on behalf of the driver.
|
|
*/
|
|
void
|
|
crypto_done(struct cryptop *crp)
|
|
{
|
|
unsigned long q_flags;
|
|
|
|
dprintk("%s()\n", __FUNCTION__);
|
|
if ((crp->crp_flags & CRYPTO_F_DONE) == 0) {
|
|
crp->crp_flags |= CRYPTO_F_DONE;
|
|
CRYPTO_Q_LOCK();
|
|
crypto_q_cnt--;
|
|
CRYPTO_Q_UNLOCK();
|
|
} else
|
|
printk("crypto: crypto_done op already done, flags 0x%x",
|
|
crp->crp_flags);
|
|
if (crp->crp_etype != 0)
|
|
cryptostats.cs_errs++;
|
|
/*
|
|
* CBIMM means unconditionally do the callback immediately;
|
|
* CBIFSYNC means do the callback immediately only if the
|
|
* operation was done synchronously. Both are used to avoid
|
|
* doing extraneous context switches; the latter is mostly
|
|
* used with the software crypto driver.
|
|
*/
|
|
if ((crp->crp_flags & CRYPTO_F_CBIMM) ||
|
|
((crp->crp_flags & CRYPTO_F_CBIFSYNC) &&
|
|
(CRYPTO_SESID2CAPS(crp->crp_sid) & CRYPTOCAP_F_SYNC))) {
|
|
/*
|
|
* Do the callback directly. This is ok when the
|
|
* callback routine does very little (e.g. the
|
|
* /dev/crypto callback method just does a wakeup).
|
|
*/
|
|
crp->crp_callback(crp);
|
|
} else {
|
|
unsigned long r_flags;
|
|
/*
|
|
* Normal case; queue the callback for the thread.
|
|
*/
|
|
CRYPTO_RETQ_LOCK();
|
|
wake_up_interruptible(&cryptoretproc_wait);/* shared wait channel */
|
|
TAILQ_INSERT_TAIL(&crp_ret_q, crp, crp_next);
|
|
CRYPTO_RETQ_UNLOCK();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Invoke the callback on behalf of the driver.
|
|
*/
|
|
void
|
|
crypto_kdone(struct cryptkop *krp)
|
|
{
|
|
struct cryptocap *cap;
|
|
unsigned long d_flags;
|
|
|
|
if ((krp->krp_flags & CRYPTO_KF_DONE) != 0)
|
|
printk("crypto: crypto_kdone op already done, flags 0x%x",
|
|
krp->krp_flags);
|
|
krp->krp_flags |= CRYPTO_KF_DONE;
|
|
if (krp->krp_status != 0)
|
|
cryptostats.cs_kerrs++;
|
|
|
|
CRYPTO_DRIVER_LOCK();
|
|
/* XXX: What if driver is loaded in the meantime? */
|
|
if (krp->krp_hid < crypto_drivers_num) {
|
|
cap = &crypto_drivers[krp->krp_hid];
|
|
cap->cc_koperations--;
|
|
KASSERT(cap->cc_koperations >= 0, ("cc_koperations < 0"));
|
|
if (cap->cc_flags & CRYPTOCAP_F_CLEANUP)
|
|
crypto_remove(cap);
|
|
}
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
|
|
/*
|
|
* CBIMM means unconditionally do the callback immediately;
|
|
* This is used to avoid doing extraneous context switches
|
|
*/
|
|
if ((krp->krp_flags & CRYPTO_KF_CBIMM)) {
|
|
/*
|
|
* Do the callback directly. This is ok when the
|
|
* callback routine does very little (e.g. the
|
|
* /dev/crypto callback method just does a wakeup).
|
|
*/
|
|
krp->krp_callback(krp);
|
|
} else {
|
|
unsigned long r_flags;
|
|
/*
|
|
* Normal case; queue the callback for the thread.
|
|
*/
|
|
CRYPTO_RETQ_LOCK();
|
|
wake_up_interruptible(&cryptoretproc_wait);/* shared wait channel */
|
|
TAILQ_INSERT_TAIL(&crp_ret_kq, krp, krp_next);
|
|
CRYPTO_RETQ_UNLOCK();
|
|
}
|
|
}
|
|
|
|
int
|
|
crypto_getfeat(int *featp)
|
|
{
|
|
int hid, kalg, feat = 0;
|
|
unsigned long d_flags;
|
|
|
|
CRYPTO_DRIVER_LOCK();
|
|
for (hid = 0; hid < crypto_drivers_num; hid++) {
|
|
const struct cryptocap *cap = &crypto_drivers[hid];
|
|
|
|
if ((cap->cc_flags & CRYPTOCAP_F_SOFTWARE) &&
|
|
!crypto_devallowsoft) {
|
|
continue;
|
|
}
|
|
for (kalg = 0; kalg < CRK_ALGORITHM_MAX; kalg++)
|
|
if (cap->cc_kalg[kalg] & CRYPTO_ALG_FLAG_SUPPORTED)
|
|
feat |= 1 << kalg;
|
|
}
|
|
CRYPTO_DRIVER_UNLOCK();
|
|
*featp = feat;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Crypto thread, dispatches crypto requests.
|
|
*/
|
|
static int
|
|
crypto_proc(void *arg)
|
|
{
|
|
struct cryptop *crp, *submit;
|
|
struct cryptkop *krp, *krpp;
|
|
struct cryptocap *cap;
|
|
u_int32_t hid;
|
|
int result, hint;
|
|
unsigned long q_flags;
|
|
int loopcount = 0;
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
CRYPTO_Q_LOCK();
|
|
for (;;) {
|
|
/*
|
|
* we need to make sure we don't get into a busy loop with nothing
|
|
* to do, the two crypto_all_*blocked vars help us find out when
|
|
* we are all full and can do nothing on any driver or Q. If so we
|
|
* wait for an unblock.
|
|
*/
|
|
crypto_all_qblocked = !list_empty(&crp_q);
|
|
|
|
/*
|
|
* Find the first element in the queue that can be
|
|
* processed and look-ahead to see if multiple ops
|
|
* are ready for the same driver.
|
|
*/
|
|
submit = NULL;
|
|
hint = 0;
|
|
list_for_each_entry(crp, &crp_q, crp_next) {
|
|
hid = CRYPTO_SESID2HID(crp->crp_sid);
|
|
cap = crypto_checkdriver(hid);
|
|
/*
|
|
* Driver cannot disappear when there is an active
|
|
* session.
|
|
*/
|
|
KASSERT(cap != NULL, ("%s:%u Driver disappeared.",
|
|
__func__, __LINE__));
|
|
if (cap == NULL || cap->cc_dev == NULL) {
|
|
/* Op needs to be migrated, process it. */
|
|
if (submit == NULL)
|
|
submit = crp;
|
|
break;
|
|
}
|
|
if (!cap->cc_qblocked) {
|
|
if (submit != NULL) {
|
|
/*
|
|
* We stop on finding another op,
|
|
* regardless whether its for the same
|
|
* driver or not. We could keep
|
|
* searching the queue but it might be
|
|
* better to just use a per-driver
|
|
* queue instead.
|
|
*/
|
|
if (CRYPTO_SESID2HID(submit->crp_sid) == hid)
|
|
hint = CRYPTO_HINT_MORE;
|
|
break;
|
|
} else {
|
|
submit = crp;
|
|
if ((submit->crp_flags & CRYPTO_F_BATCH) == 0)
|
|
break;
|
|
/* keep scanning for more are q'd */
|
|
}
|
|
}
|
|
}
|
|
if (submit != NULL) {
|
|
hid = CRYPTO_SESID2HID(submit->crp_sid);
|
|
crypto_all_qblocked = 0;
|
|
list_del(&submit->crp_next);
|
|
crypto_drivers[hid].cc_unqblocked = 1;
|
|
cap = crypto_checkdriver(hid);
|
|
CRYPTO_Q_UNLOCK();
|
|
KASSERT(cap != NULL, ("%s:%u Driver disappeared.",
|
|
__func__, __LINE__));
|
|
result = crypto_invoke(cap, submit, hint);
|
|
CRYPTO_Q_LOCK();
|
|
if (result == ERESTART) {
|
|
/*
|
|
* The driver ran out of resources, mark the
|
|
* driver ``blocked'' for cryptop's and put
|
|
* the request back in the queue. It would
|
|
* best to put the request back where we got
|
|
* it but that's hard so for now we put it
|
|
* at the front. This should be ok; putting
|
|
* it at the end does not work.
|
|
*/
|
|
/* XXX validate sid again? */
|
|
list_add(&submit->crp_next, &crp_q);
|
|
cryptostats.cs_blocks++;
|
|
if (crypto_drivers[hid].cc_unqblocked)
|
|
crypto_drivers[hid].cc_qblocked=0;
|
|
crypto_drivers[hid].cc_unqblocked=0;
|
|
}
|
|
crypto_drivers[hid].cc_unqblocked = 0;
|
|
}
|
|
|
|
crypto_all_kqblocked = !list_empty(&crp_kq);
|
|
|
|
/* As above, but for key ops */
|
|
krp = NULL;
|
|
list_for_each_entry(krpp, &crp_kq, krp_next) {
|
|
cap = crypto_checkdriver(krpp->krp_hid);
|
|
if (cap == NULL || cap->cc_dev == NULL) {
|
|
/*
|
|
* Operation needs to be migrated, invalidate
|
|
* the assigned device so it will reselect a
|
|
* new one below. Propagate the original
|
|
* crid selection flags if supplied.
|
|
*/
|
|
krp->krp_hid = krp->krp_crid &
|
|
(CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE);
|
|
if (krp->krp_hid == 0)
|
|
krp->krp_hid =
|
|
CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE;
|
|
break;
|
|
}
|
|
if (!cap->cc_kqblocked) {
|
|
krp = krpp;
|
|
break;
|
|
}
|
|
}
|
|
if (krp != NULL) {
|
|
crypto_all_kqblocked = 0;
|
|
list_del(&krp->krp_next);
|
|
crypto_drivers[krp->krp_hid].cc_kqblocked = 1;
|
|
CRYPTO_Q_UNLOCK();
|
|
result = crypto_kinvoke(krp, krp->krp_hid);
|
|
CRYPTO_Q_LOCK();
|
|
if (result == ERESTART) {
|
|
/*
|
|
* The driver ran out of resources, mark the
|
|
* driver ``blocked'' for cryptkop's and put
|
|
* the request back in the queue. It would
|
|
* best to put the request back where we got
|
|
* it but that's hard so for now we put it
|
|
* at the front. This should be ok; putting
|
|
* it at the end does not work.
|
|
*/
|
|
/* XXX validate sid again? */
|
|
list_add(&krp->krp_next, &crp_kq);
|
|
cryptostats.cs_kblocks++;
|
|
} else
|
|
crypto_drivers[krp->krp_hid].cc_kqblocked = 0;
|
|
}
|
|
|
|
if (submit == NULL && krp == NULL) {
|
|
/*
|
|
* Nothing more to be processed. Sleep until we're
|
|
* woken because there are more ops to process.
|
|
* This happens either by submission or by a driver
|
|
* becoming unblocked and notifying us through
|
|
* crypto_unblock. Note that when we wakeup we
|
|
* start processing each queue again from the
|
|
* front. It's not clear that it's important to
|
|
* preserve this ordering since ops may finish
|
|
* out of order if dispatched to different devices
|
|
* and some become blocked while others do not.
|
|
*/
|
|
dprintk("%s - sleeping (qe=%d qb=%d kqe=%d kqb=%d)\n",
|
|
__FUNCTION__,
|
|
list_empty(&crp_q), crypto_all_qblocked,
|
|
list_empty(&crp_kq), crypto_all_kqblocked);
|
|
loopcount = 0;
|
|
CRYPTO_Q_UNLOCK();
|
|
wait_event_interruptible(cryptoproc_wait,
|
|
!(list_empty(&crp_q) || crypto_all_qblocked) ||
|
|
!(list_empty(&crp_kq) || crypto_all_kqblocked) ||
|
|
kthread_should_stop());
|
|
if (signal_pending (current)) {
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
|
|
spin_lock_irq(¤t->sigmask_lock);
|
|
#endif
|
|
flush_signals(current);
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
|
|
spin_unlock_irq(¤t->sigmask_lock);
|
|
#endif
|
|
}
|
|
CRYPTO_Q_LOCK();
|
|
dprintk("%s - awake\n", __FUNCTION__);
|
|
if (kthread_should_stop())
|
|
break;
|
|
cryptostats.cs_intrs++;
|
|
} else if (loopcount > crypto_max_loopcount) {
|
|
/*
|
|
* Give other processes a chance to run if we've
|
|
* been using the CPU exclusively for a while.
|
|
*/
|
|
loopcount = 0;
|
|
CRYPTO_Q_UNLOCK();
|
|
schedule();
|
|
CRYPTO_Q_LOCK();
|
|
}
|
|
loopcount++;
|
|
}
|
|
CRYPTO_Q_UNLOCK();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Crypto returns thread, does callbacks for processed crypto requests.
|
|
* Callbacks are done here, rather than in the crypto drivers, because
|
|
* callbacks typically are expensive and would slow interrupt handling.
|
|
*/
|
|
static int
|
|
crypto_ret_proc(void *arg)
|
|
{
|
|
struct cryptop *crpt;
|
|
struct cryptkop *krpt;
|
|
unsigned long r_flags;
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
CRYPTO_RETQ_LOCK();
|
|
for (;;) {
|
|
/* Harvest return q's for completed ops */
|
|
crpt = NULL;
|
|
if (!list_empty(&crp_ret_q))
|
|
crpt = list_entry(crp_ret_q.next, typeof(*crpt), crp_next);
|
|
if (crpt != NULL)
|
|
list_del(&crpt->crp_next);
|
|
|
|
krpt = NULL;
|
|
if (!list_empty(&crp_ret_kq))
|
|
krpt = list_entry(crp_ret_kq.next, typeof(*krpt), krp_next);
|
|
if (krpt != NULL)
|
|
list_del(&krpt->krp_next);
|
|
|
|
if (crpt != NULL || krpt != NULL) {
|
|
CRYPTO_RETQ_UNLOCK();
|
|
/*
|
|
* Run callbacks unlocked.
|
|
*/
|
|
if (crpt != NULL)
|
|
crpt->crp_callback(crpt);
|
|
if (krpt != NULL)
|
|
krpt->krp_callback(krpt);
|
|
CRYPTO_RETQ_LOCK();
|
|
} else {
|
|
/*
|
|
* Nothing more to be processed. Sleep until we're
|
|
* woken because there are more returns to process.
|
|
*/
|
|
dprintk("%s - sleeping\n", __FUNCTION__);
|
|
CRYPTO_RETQ_UNLOCK();
|
|
wait_event_interruptible(cryptoretproc_wait,
|
|
!list_empty(&crp_ret_q) ||
|
|
!list_empty(&crp_ret_kq) ||
|
|
kthread_should_stop());
|
|
if (signal_pending (current)) {
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
|
|
spin_lock_irq(¤t->sigmask_lock);
|
|
#endif
|
|
flush_signals(current);
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
|
|
spin_unlock_irq(¤t->sigmask_lock);
|
|
#endif
|
|
}
|
|
CRYPTO_RETQ_LOCK();
|
|
dprintk("%s - awake\n", __FUNCTION__);
|
|
if (kthread_should_stop()) {
|
|
dprintk("%s - EXITING!\n", __FUNCTION__);
|
|
break;
|
|
}
|
|
cryptostats.cs_rets++;
|
|
}
|
|
}
|
|
CRYPTO_RETQ_UNLOCK();
|
|
return 0;
|
|
}
|
|
|
|
|
|
#if 0 /* should put this into /proc or something */
|
|
static void
|
|
db_show_drivers(void)
|
|
{
|
|
int hid;
|
|
|
|
db_printf("%12s %4s %4s %8s %2s %2s\n"
|
|
, "Device"
|
|
, "Ses"
|
|
, "Kops"
|
|
, "Flags"
|
|
, "QB"
|
|
, "KB"
|
|
);
|
|
for (hid = 0; hid < crypto_drivers_num; hid++) {
|
|
const struct cryptocap *cap = &crypto_drivers[hid];
|
|
if (cap->cc_dev == NULL)
|
|
continue;
|
|
db_printf("%-12s %4u %4u %08x %2u %2u\n"
|
|
, device_get_nameunit(cap->cc_dev)
|
|
, cap->cc_sessions
|
|
, cap->cc_koperations
|
|
, cap->cc_flags
|
|
, cap->cc_qblocked
|
|
, cap->cc_kqblocked
|
|
);
|
|
}
|
|
}
|
|
|
|
DB_SHOW_COMMAND(crypto, db_show_crypto)
|
|
{
|
|
struct cryptop *crp;
|
|
|
|
db_show_drivers();
|
|
db_printf("\n");
|
|
|
|
db_printf("%4s %8s %4s %4s %4s %4s %8s %8s\n",
|
|
"HID", "Caps", "Ilen", "Olen", "Etype", "Flags",
|
|
"Desc", "Callback");
|
|
TAILQ_FOREACH(crp, &crp_q, crp_next) {
|
|
db_printf("%4u %08x %4u %4u %4u %04x %8p %8p\n"
|
|
, (int) CRYPTO_SESID2HID(crp->crp_sid)
|
|
, (int) CRYPTO_SESID2CAPS(crp->crp_sid)
|
|
, crp->crp_ilen, crp->crp_olen
|
|
, crp->crp_etype
|
|
, crp->crp_flags
|
|
, crp->crp_desc
|
|
, crp->crp_callback
|
|
);
|
|
}
|
|
if (!TAILQ_EMPTY(&crp_ret_q)) {
|
|
db_printf("\n%4s %4s %4s %8s\n",
|
|
"HID", "Etype", "Flags", "Callback");
|
|
TAILQ_FOREACH(crp, &crp_ret_q, crp_next) {
|
|
db_printf("%4u %4u %04x %8p\n"
|
|
, (int) CRYPTO_SESID2HID(crp->crp_sid)
|
|
, crp->crp_etype
|
|
, crp->crp_flags
|
|
, crp->crp_callback
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
DB_SHOW_COMMAND(kcrypto, db_show_kcrypto)
|
|
{
|
|
struct cryptkop *krp;
|
|
|
|
db_show_drivers();
|
|
db_printf("\n");
|
|
|
|
db_printf("%4s %5s %4s %4s %8s %4s %8s\n",
|
|
"Op", "Status", "#IP", "#OP", "CRID", "HID", "Callback");
|
|
TAILQ_FOREACH(krp, &crp_kq, krp_next) {
|
|
db_printf("%4u %5u %4u %4u %08x %4u %8p\n"
|
|
, krp->krp_op
|
|
, krp->krp_status
|
|
, krp->krp_iparams, krp->krp_oparams
|
|
, krp->krp_crid, krp->krp_hid
|
|
, krp->krp_callback
|
|
);
|
|
}
|
|
if (!TAILQ_EMPTY(&crp_ret_q)) {
|
|
db_printf("%4s %5s %8s %4s %8s\n",
|
|
"Op", "Status", "CRID", "HID", "Callback");
|
|
TAILQ_FOREACH(krp, &crp_ret_kq, krp_next) {
|
|
db_printf("%4u %5u %08x %4u %8p\n"
|
|
, krp->krp_op
|
|
, krp->krp_status
|
|
, krp->krp_crid, krp->krp_hid
|
|
, krp->krp_callback
|
|
);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
static int
|
|
crypto_init(void)
|
|
{
|
|
int error;
|
|
unsigned long cpu;
|
|
|
|
dprintk("%s(%p)\n", __FUNCTION__, (void *) crypto_init);
|
|
|
|
if (crypto_initted)
|
|
return 0;
|
|
crypto_initted = 1;
|
|
|
|
spin_lock_init(&crypto_drivers_lock);
|
|
spin_lock_init(&crypto_q_lock);
|
|
spin_lock_init(&crypto_ret_q_lock);
|
|
|
|
cryptop_zone = kmem_cache_create("cryptop", sizeof(struct cryptop),
|
|
0, SLAB_HWCACHE_ALIGN, NULL
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
|
|
, NULL
|
|
#endif
|
|
);
|
|
|
|
cryptodesc_zone = kmem_cache_create("cryptodesc", sizeof(struct cryptodesc),
|
|
0, SLAB_HWCACHE_ALIGN, NULL
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
|
|
, NULL
|
|
#endif
|
|
);
|
|
|
|
if (cryptodesc_zone == NULL || cryptop_zone == NULL) {
|
|
printk("crypto: crypto_init cannot setup crypto zones\n");
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
crypto_drivers_num = CRYPTO_DRIVERS_INITIAL;
|
|
crypto_drivers = kmalloc(crypto_drivers_num * sizeof(struct cryptocap),
|
|
GFP_KERNEL);
|
|
if (crypto_drivers == NULL) {
|
|
printk("crypto: crypto_init cannot setup crypto drivers\n");
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
memset(crypto_drivers, 0, crypto_drivers_num * sizeof(struct cryptocap));
|
|
|
|
ocf_for_each_cpu(cpu) {
|
|
cryptoproc[cpu] = kthread_create(crypto_proc, (void *) cpu,
|
|
"ocf_%d", (int) cpu);
|
|
if (IS_ERR(cryptoproc[cpu])) {
|
|
error = PTR_ERR(cryptoproc[cpu]);
|
|
printk("crypto: crypto_init cannot start crypto thread; error %d",
|
|
error);
|
|
goto bad;
|
|
}
|
|
kthread_bind(cryptoproc[cpu], cpu);
|
|
wake_up_process(cryptoproc[cpu]);
|
|
|
|
cryptoretproc[cpu] = kthread_create(crypto_ret_proc, (void *) cpu,
|
|
"ocf_ret_%d", (int) cpu);
|
|
if (IS_ERR(cryptoretproc[cpu])) {
|
|
error = PTR_ERR(cryptoretproc[cpu]);
|
|
printk("crypto: crypto_init cannot start cryptoret thread; error %d",
|
|
error);
|
|
goto bad;
|
|
}
|
|
kthread_bind(cryptoretproc[cpu], cpu);
|
|
wake_up_process(cryptoretproc[cpu]);
|
|
}
|
|
|
|
return 0;
|
|
bad:
|
|
crypto_exit();
|
|
return error;
|
|
}
|
|
|
|
|
|
static void
|
|
crypto_exit(void)
|
|
{
|
|
int cpu;
|
|
|
|
dprintk("%s()\n", __FUNCTION__);
|
|
|
|
/*
|
|
* Terminate any crypto threads.
|
|
*/
|
|
ocf_for_each_cpu(cpu) {
|
|
kthread_stop(cryptoproc[cpu]);
|
|
kthread_stop(cryptoretproc[cpu]);
|
|
}
|
|
|
|
/*
|
|
* Reclaim dynamically allocated resources.
|
|
*/
|
|
if (crypto_drivers != NULL)
|
|
kfree(crypto_drivers);
|
|
|
|
if (cryptodesc_zone != NULL)
|
|
kmem_cache_destroy(cryptodesc_zone);
|
|
if (cryptop_zone != NULL)
|
|
kmem_cache_destroy(cryptop_zone);
|
|
}
|
|
|
|
|
|
EXPORT_SYMBOL(crypto_newsession);
|
|
EXPORT_SYMBOL(crypto_freesession);
|
|
EXPORT_SYMBOL(crypto_get_driverid);
|
|
EXPORT_SYMBOL(crypto_kregister);
|
|
EXPORT_SYMBOL(crypto_register);
|
|
EXPORT_SYMBOL(crypto_unregister);
|
|
EXPORT_SYMBOL(crypto_unregister_all);
|
|
EXPORT_SYMBOL(crypto_unblock);
|
|
EXPORT_SYMBOL(crypto_dispatch);
|
|
EXPORT_SYMBOL(crypto_kdispatch);
|
|
EXPORT_SYMBOL(crypto_freereq);
|
|
EXPORT_SYMBOL(crypto_getreq);
|
|
EXPORT_SYMBOL(crypto_done);
|
|
EXPORT_SYMBOL(crypto_kdone);
|
|
EXPORT_SYMBOL(crypto_getfeat);
|
|
EXPORT_SYMBOL(crypto_userasymcrypto);
|
|
EXPORT_SYMBOL(crypto_getcaps);
|
|
EXPORT_SYMBOL(crypto_find_driver);
|
|
EXPORT_SYMBOL(crypto_find_device_byhid);
|
|
|
|
module_init(crypto_init);
|
|
module_exit(crypto_exit);
|
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
|
|
MODULE_DESCRIPTION("OCF (OpenBSD Cryptographic Framework)");
|