1 files changed, 317 insertions, 0 deletions
diff --git a/target/linux/generic/files/crypto/ocf/random.c b/target/linux/generic/files/crypto/ocf/random.c
new file mode 100644
index 000000000..4bb773ffb
--- /dev/null
+++ b/target/linux/generic/files/crypto/ocf/random.c
@@ -0,0 +1,317 @@
+/*
+ * A system independant way of adding entropy to the kernels pool
+ * this way the drivers can focus on the real work and we can take
+ * care of pushing it to the appropriate place in the kernel.
+ *
+ * This should be fast and callable from timers/interrupts
+ *
+ * Written by David McCullough <david_mccullough@mcafee.com>
+ * Copyright (C) 2006-2010 David McCullough
+ * Copyright (C) 2004-2005 Intel Corporation.
+ *
+ * LICENSE TERMS
+ *
+ * The free distribution and use of this software in both source and binary
+ * form is allowed (with or without changes) provided that:
+ *
+ *   1. distributions of this source code include the above copyright
+ *      notice, this list of conditions and the following disclaimer;
+ *
+ *   2. distributions in binary form include the above copyright
+ *      notice, this list of conditions and the following disclaimer
+ *      in the documentation and/or other associated materials;
+ *
+ *   3. the copyright holder's name is not used to endorse products
+ *      built using this software without specific written permission.
+ *
+ * ALTERNATIVELY, provided that this notice is retained in full, this product
+ * may be distributed under the terms of the GNU General Public License (GPL),
+ * in which case the provisions of the GPL apply INSTEAD OF those given above.
+ *
+ * DISCLAIMER
+ *
+ * This software is provided 'as is' with no explicit or implied warranties
+ * in respect of its properties, including, but not limited to, correctness
+ * and/or fitness for purpose.
+ */
+
+#include <linux/version.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED)
+#include <linux/config.h>
+#endif
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/unistd.h>
+#include <linux/poll.h>
+#include <linux/random.h>
+#include <cryptodev.h>
+
+#ifdef CONFIG_OCF_FIPS
+#include "rndtest.h"
+#endif
+
+#ifndef HAS_RANDOM_INPUT_WAIT
+#error "Please do not enable OCF_RANDOMHARVEST unless you have applied patches"
+#endif
+
+/*
+ * a hack to access the debug levels from the crypto driver
+ */
+extern int crypto_debug;
+#define debug crypto_debug
+
+/*
+ * a list of all registered random providers
+ */
+static LIST_HEAD(random_ops);
+static int started = 0;
+static int initted = 0;
+
+struct random_op {
+	struct list_head random_list;
+	u_int32_t driverid;
+	int (*read_random)(void *arg, u_int32_t *buf, int len);
+	void *arg;
+};
+
+static int random_proc(void *arg);
+
+static pid_t		randomproc = (pid_t) -1;
+static spinlock_t	random_lock;
+
+/*
+ * just init the spin locks
+ */
+static int
+crypto_random_init(void)
+{
+	spin_lock_init(&random_lock);
+	initted = 1;
+	return(0);
+}
+
+/*
+ * Add the given random reader to our list (if not present)
+ * and start the thread (if not already started)
+ *
+ * we have to assume that driver id is ok for now
+ */
+int
+crypto_rregister(
+	u_int32_t driverid,
+	int (*read_random)(void *arg, u_int32_t *buf, int len),
+	void *arg)
+{
+	unsigned long flags;
+	int ret = 0;
+	struct random_op	*rops, *tmp;
+
+	dprintk("%s,%d: %s(0x%x, %p, %p)\n", __FILE__, __LINE__,
+			__FUNCTION__, driverid, read_random, arg);
+
+	if (!initted)
+		crypto_random_init();
+
+#if 0
+	struct cryptocap	*cap;
+
+	cap = crypto_checkdriver(driverid);
+	if (!cap)
+		return EINVAL;
+#endif
+
+	list_for_each_entry_safe(rops, tmp, &random_ops, random_list) {
+		if (rops->driverid == driverid && rops->read_random == read_random)
+			return EEXIST;
+	}
+
+	rops = (struct random_op *) kmalloc(sizeof(*rops), GFP_KERNEL);
+	if (!rops)
+		return ENOMEM;
+
+	rops->driverid    = driverid;
+	rops->read_random = read_random;
+	rops->arg = arg;
+
+	spin_lock_irqsave(&random_lock, flags);
+	list_add_tail(&rops->random_list, &random_ops);
+	if (!started) {
+		randomproc = kernel_thread(random_proc, NULL, CLONE_FS|CLONE_FILES);
+		if (randomproc < 0) {
+			ret = randomproc;
+			printk("crypto: crypto_rregister cannot start random thread; "
+					"error %d", ret);
+		} else
+			started = 1;
+	}
+	spin_unlock_irqrestore(&random_lock, flags);
+
+	return ret;
+}
+EXPORT_SYMBOL(crypto_rregister);
+
+int
+crypto_runregister_all(u_int32_t driverid)
+{
+	struct random_op *rops, *tmp;
+	unsigned long flags;
+
+	dprintk("%s,%d: %s(0x%x)\n", __FILE__, __LINE__, __FUNCTION__, driverid);
+
+	list_for_each_entry_safe(rops, tmp, &random_ops, random_list) {
+		if (rops->driverid == driverid) {
+			list_del(&rops->random_list);
+			kfree(rops);
+		}
+	}
+
+	spin_lock_irqsave(&random_lock, flags);
+	if (list_empty(&random_ops) && started)
+		kill_proc(randomproc, SIGKILL, 1);
+	spin_unlock_irqrestore(&random_lock, flags);
+	return(0);
+}
+EXPORT_SYMBOL(crypto_runregister_all);
+
+/*
+ * while we can add entropy to random.c continue to read random data from
+ * the drivers and push it to random.
+ */
+static int
+random_proc(void *arg)
+{
+	int n;
+	int wantcnt;
+	int bufcnt = 0;
+	int retval = 0;
+	int *buf = NULL;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+	daemonize();
+	spin_lock_irq(&current->sigmask_lock);
+	sigemptyset(&current->blocked);
+	recalc_sigpending(current);
+	spin_unlock_irq(&current->sigmask_lock);
+	sprintf(current->comm, "ocf-random");
+#else
+	daemonize("ocf-random");
+	allow_signal(SIGKILL);
+#endif
+
+	(void) get_fs();
+	set_fs(get_ds());
+
+#ifdef CONFIG_OCF_FIPS
+#define NUM_INT (RNDTEST_NBYTES/sizeof(int))
+#else
+#define NUM_INT 32
+#endif
+
+	/*
+	 * some devices can transferr their RNG data direct into memory,
+	 * so make sure it is device friendly
+	 */
+	buf = kmalloc(NUM_INT * sizeof(int), GFP_DMA);
+	if (NULL == buf) {
+		printk("crypto: RNG could not allocate memory\n");
+		retval = -ENOMEM;
+		goto bad_alloc;
+	}
+
+	wantcnt = NUM_INT;   /* start by adding some entropy */
+
+	/*
+	 * its possible due to errors or driver removal that we no longer
+	 * have anything to do,  if so exit or we will consume all the CPU
+	 * doing nothing
+	 */
+	while (!list_empty(&random_ops)) {
+		struct random_op	*rops, *tmp;
+
+#ifdef CONFIG_OCF_FIPS
+		if (wantcnt)
+			wantcnt = NUM_INT; /* FIPs mode can do 20000 bits or none */
+#endif
+
+		/* see if we can get enough entropy to make the world
+		 * a better place.
+		 */
+		while (bufcnt < wantcnt && bufcnt < NUM_INT) {
+			list_for_each_entry_safe(rops, tmp, &random_ops, random_list) {
+
+				n = (*rops->read_random)(rops->arg, &buf[bufcnt],
+							 NUM_INT - bufcnt);
+
+				/* on failure remove the random number generator */
+				if (n == -1) {
+					list_del(&rops->random_list);
+					printk("crypto: RNG (driverid=0x%x) failed, disabling\n",
+							rops->driverid);
+					kfree(rops);
+				} else if (n > 0)
+					bufcnt += n;
+			}
+			/* give up CPU for a bit, just in case as this is a loop */
+			schedule();
+		}
+
+
+#ifdef CONFIG_OCF_FIPS
+		if (bufcnt > 0 && rndtest_buf((unsigned char *) &buf[0])) {
+			dprintk("crypto: buffer had fips errors, discarding\n");
+			bufcnt = 0;
+		}
+#endif
+
+		/*
+		 * if we have a certified buffer,  we can send some data
+		 * to /dev/random and move along
+		 */
+		if (bufcnt > 0) {
+			/* add what we have */
+			random_input_words(buf, bufcnt, bufcnt*sizeof(int)*8);
+			bufcnt = 0;
+		}
+
+		/* give up CPU for a bit so we don't hog while filling */
+		schedule();
+
+		/* wait for needing more */
+		wantcnt = random_input_wait();
+
+		if (wantcnt <= 0)
+			wantcnt = 0; /* try to get some info again */
+		else
+		 	/* round up to one word or we can loop forever */
+			wantcnt = (wantcnt + (sizeof(int)*8)) / (sizeof(int)*8);
+		if (wantcnt > NUM_INT) {
+			wantcnt = NUM_INT;
+		}
+
+		if (signal_pending(current)) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+			spin_lock_irq(&current->sigmask_lock);
+#endif
+			flush_signals(current);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+			spin_unlock_irq(&current->sigmask_lock);
+#endif
+		}
+	}
+	
+	kfree(buf);
+
+bad_alloc:
+	spin_lock_irq(&random_lock);
+	randomproc = (pid_t) -1;
+	started = 0;
+	spin_unlock_irq(&random_lock);
+
+	return retval;
+}
+