1 files changed, 138 insertions, 0 deletions
diff --git a/sys/dev/random/random_adaptors.c b/sys/dev/random/random_adaptors.c
new file mode 100644
index 0000000..c187bdb
--- /dev/null
+++ b/sys/dev/random/random_adaptors.c
@@ -0,0 +1,138 @@
+/*-
+ * Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com>
+ * Copyright (c) 2013 David E. O'Brien <obrien@NUXI.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/lock.h>
+#include <sys/selinfo.h>
+#include <sys/sysctl.h>
+#include <sys/sx.h>
+#include <sys/malloc.h>
+#include <sys/queue.h>
+#include <sys/libkern.h>
+
+#include <dev/random/random_adaptors.h>
+#include <dev/random/randomdev.h>
+
+LIST_HEAD(adaptors_head, random_adaptors);
+static struct adaptors_head adaptors = LIST_HEAD_INITIALIZER(adaptors);
+static struct sx adaptors_lock; /* need a sleepable lock */
+
+/* List for the dynamic sysctls */
+static struct sysctl_ctx_list random_clist;
+
+MALLOC_DEFINE(M_RANDOM_ADAPTORS, "random_adaptors", "Random adaptors buffers");
+
+int
+random_adaptor_register(const char *name, struct random_adaptor *rsp)
+{
+	struct random_adaptors *rpp;
+
+	KASSERT(name != NULL && rsp != NULL, ("invalid input to %s", __func__));
+
+	rpp = malloc(sizeof(struct random_adaptors), M_RANDOM_ADAPTORS, M_WAITOK);
+	rpp->name = name;
+	rpp->rsp = rsp;
+
+	sx_xlock(&adaptors_lock);
+	LIST_INSERT_HEAD(&adaptors, rpp, entries);
+	sx_xunlock(&adaptors_lock);
+
+	return (0);
+}
+
+struct random_adaptor *
+random_adaptor_get(const char *name)
+{
+	struct random_adaptors	*rpp;
+	struct random_adaptor	*rsp;
+
+	rsp = NULL;
+
+	sx_slock(&adaptors_lock);
+
+	LIST_FOREACH(rpp, &adaptors, entries)
+		if (strcmp(rpp->name, name) == 0)
+			rsp = rpp->rsp;
+
+	sx_sunlock(&adaptors_lock);
+
+	return (rsp);
+}
+
+static void
+random_adaptors_deinit(void *unused)
+{
+
+	sx_destroy(&adaptors_lock);
+	sysctl_ctx_free(&random_clist);
+}
+
+static int
+random_sysctl_adaptors_handler(SYSCTL_HANDLER_ARGS)
+{
+	struct random_adaptors	*rpp;
+	int error;
+
+	error = 0;
+
+	sx_slock(&adaptors_lock);
+
+	if (LIST_EMPTY(&adaptors))
+		error = SYSCTL_OUT(req, "", strlen(""));
+
+	LIST_FOREACH(rpp, &adaptors, entries) {
+		if (0 != SYSCTL_OUT(req, rpp->name, strlen(rpp->name)))
+			break;
+	}
+
+	sx_sunlock(&adaptors_lock);
+
+	return (error);
+}
+
+static void
+random_adaptors_init(void *unused)
+{
+
+	SYSCTL_PROC(_kern_random, OID_AUTO, adaptors,
+	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
+	    NULL, 0, random_sysctl_adaptors_handler, "",
+	    "Random Number Generator adaptors");
+
+	sx_init(&adaptors_lock, "random_adaptors");
+}
+
+SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Random Number Generator");
+
+SYSINIT(random_adaptors, SI_SUB_DRIVERS, SI_ORDER_FIRST, random_adaptors_init,
+    NULL);
+SYSUNINIT(random_adaptors, SI_SUB_DRIVERS, SI_ORDER_FIRST,
+    random_adaptors_deinit, NULL);