Files for compiling packet filter expressions

diff --git a/pppd/bpf_compile.h b/pppd/bpf_compile.h
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+/*
+ * Copyright (c) 1993, 1994
+ *     The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the Computer Systems
+ *     Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory may be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ * from: NetBSD: pcap.h,v 1.2 1995/03/06 11:39:07 mycroft Exp
+ * from: @(#) Header: pcap.h,v 1.15 94/06/14 20:03:34 leres Exp (LBL)
+ *
+ * $Id: bpf_compile.h,v 1.1 1996/04/04 03:33:19 paulus Exp $
+ */
+
+#ifndef _BPF_COMPILE_H
+#define _BPF_COMPILE_H
+
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <net/bpf.h>
+
+#define PCAP_ERRBUF_SIZE 256
+
+int    bpf_compile __P((struct bpf_program *, char *, int));
+char   *bpf_geterr __P((void));
+
+unsigned int bpf_filter __P((struct bpf_insn *, unsigned char *,
+                            unsigned int, unsigned int));
+
+unsigned long  **pcap_nametoaddr __P((const char *));
+unsigned long  pcap_nametonetaddr __P((const char *));
+
+int    pcap_nametoport __P((const char *, int *, int *));
+int    pcap_nametoproto __P((const char *));
+int    pcap_nametopppproto __P((const char *));
+
+/*
+ * If a protocol is unknown, PROTO_UNDEF is returned.
+ * Also, pcap_nametoport() returns the protocol along with the port number.
+ * If there are ambiguous entries in /etc/services (i.e. domain
+ * can be either tcp or udp) PROTO_UNDEF is returned.
+ */
+#define PROTO_UNDEF            -1
+
+unsigned long  __pcap_atoin __P((const char *));
+
+#endif /* _BPF_COMPILE_H */