Add pfil(9) subroutines and manpage from NetBSD.

1 files changed, 81 insertions, 0 deletions

diff --git a/sys/net/pfil.h b/sys/net/pfil.h
new file mode 100644
index 0000000..7831328
--- /dev/null
+++ b/sys/net/pfil.h
@@ -0,0 +1,81 @@
+/*	$FreeBSD$	*/
+
+/*
+ * Copyright (c) 1996 Matthew R. Green
+ * 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.
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * 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.
+ */
+
+#ifndef _NET_PFIL_H_
+#define _NET_PFIL_H_
+
+#include <sys/queue.h>
+
+struct mbuf;
+struct ifnet;
+
+/*
+ * The packet filter hooks are designed for anything to call them to
+ * possibly intercept the packet.
+ */
+struct packet_filter_hook {
+        TAILQ_ENTRY(packet_filter_hook) pfil_link;
+        int	(*pfil_func) __P((void *, int, struct ifnet *, int,
+				  struct mbuf **));
+	int	pfil_flags;
+};
+
+#define PFIL_IN		0x00000001
+#define PFIL_OUT	0x00000002
+#define PFIL_WAITOK	0x00000004
+#define PFIL_ALL	(PFIL_IN|PFIL_OUT)
+
+typedef	TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
+
+struct pfil_head {
+	pfil_list_t	ph_in;
+	pfil_list_t	ph_out;
+	int		ph_init;
+} pfil_head_t;
+
+struct packet_filter_hook *pfil_hook_get __P((int, struct pfil_head *));
+int	pfil_add_hook __P((int (*func) __P((void *, int,
+	    struct ifnet *, int, struct mbuf **)), int, struct pfil_head *));
+int	pfil_remove_hook __P((int (*func) __P((void *, int,
+	    struct ifnet *, int, struct mbuf **)), int, struct pfil_head *));
+
+/* XXX */
+#if defined(_KERNEL) && !defined(_LKM)
+#include "ipfilter.h"
+#endif
+
+#if NIPFILTER > 0
+#ifdef PFIL_HOOKS
+#undef PFIL_HOOKS
+#endif
+#define PFIL_HOOKS
+#endif /* NIPFILTER */
+
+#endif /* _NET_PFIL_H_ */