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diff --git a/bsm/audit_filter.h b/bsm/audit_filter.h
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+/*-
+ * Copyright (c) 2006 Robert N. M. Watson
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson for the TrustedBSD Project.
+ *
+ * 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.
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $P4: //depot/projects/trustedbsd/openbsm/bsm/audit_filter.h#4 $
+ */
+
+#ifndef _BSM_AUDIT_FILTER_H_
+#define	_BSM_AUDIT_FILTER_H_
+
+/*
+ * Module interface for audit filter modules.
+ *
+ * audit_filter_attach_t - filter module is being attached with arguments
+ * audit_filter_reinit_t - arguments to module have changed
+ * audit_filter_record_t - present parsed record to filter module, with
+ *                         receipt time
+ * audit_filter_rawrecord_t - present BSM format record to filter module,
+ *                            with receipt time
+ * audit_filter_destach_t - filter module is being detached
+ *
+ * There may be many instances of the same filter, identified by the instance
+ * void pointer maintained by the filter instance.
+ */
+typedef int (*audit_filter_attach_t)(void *instance, int argc, char *argv[]);
+typedef int (*audit_filter_reinit_t)(void *instance, int argc, char *argv[]);
+typedef void (*audit_filter_record_t)(void *instance, struct timespec *ts,
+	    int token_count, const tokenstr_t tok[]);
+typedef void (*audit_filter_rawrecord_t)(void *instance, struct timespec *ts,
+	    void *data, u_int len);
+typedef void (*audit_filter_detach_t)(void *instance);
+
+/*
+ * APIs that may be called by audit filters.
+ */
+void	audit_filter_getcookie(void *instance, void **cookie);
+void	audit_filter_setcookie(void *instance, void *cookie);
+
+/*
+ * Values to be returned by audit_filter_init_t.
+ */
+#define	AUDIT_FILTER_SUCCESS	(0)
+#define	AUDIT_FILTER_FAILURE	(-1)
+
+/*
+ * Standard name for filter module initialization functions, which will be
+ * found using dlsym().
+ */
+#define	AUDIT_FILTER_ATTACH	audit_filter_attach
+#define	AUDIT_FILTER_REINIT	audit_filter_reinit
+#define	AUDIT_FILTER_RECORD	audit_filter_record
+#define	AUDIT_FILTER_RAWRECORD	audit_filter_rawrecord
+#define	AUDIT_FILTER_DETACH	audit_filter_detach
+#define	AUDIT_FILTER_ATTACH_STRING	"audit_filter_attach"
+#define	AUDIT_FILTER_REINIT_STRING	"audit_filter_reinit"
+#define	AUDIT_FILTER_RECORD_STRING	"audit_filter_record"
+#define	AUDIT_FILTER_RAWRECORD_STRING	"audit_filter_rawrecord"
+#define	AUDIT_FILTER_DETACH_STRING	"audit_filter_detach"
+
+#endif /* !_BSM_AUDIT_FILTER_H_ */