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diff --git a/usr.sbin/pppd/lcp.h b/usr.sbin/pppd/lcp.h
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+/*
+ * lcp.h - Link Control Protocol definitions.
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * $Id: lcp.h,v 1.4 1994/05/24 11:22:28 paulus Exp $
+ */
+
+/*
+ * Options.
+ */
+#define CI_MRU		1	/* Maximum Receive Unit */
+#define CI_ASYNCMAP	2	/* Async Control Character Map */
+#define CI_AUTHTYPE	3	/* Authentication Type */
+#define CI_QUALITY	4	/* Quality Protocol */
+#define CI_MAGICNUMBER	5	/* Magic Number */
+#define CI_PCOMPRESSION	7	/* Protocol Field Compression */
+#define CI_ACCOMPRESSION 8	/* Address/Control Field Compression */
+
+/*
+ * LCP-specific packet types.
+ */
+#define PROTREJ		8	/* Protocol Reject */
+#define ECHOREQ		9	/* Echo Request */
+#define ECHOREP		10	/* Echo Reply */
+#define DISCREQ		11	/* Discard Request */
+
+/*
+ * The state of options is described by an lcp_options structure.
+ */
+typedef struct lcp_options {
+    int passive : 1;		/* Don't die if we don't get a response */
+    int silent : 1;		/* Wait for the other end to start first */
+    int restart : 1;		/* Restart vs. exit after close */
+    int neg_mru : 1;		/* Negotiate the MRU? */
+    int neg_asyncmap : 1;	/* Negotiate the async map? */
+    int neg_upap : 1;		/* Ask for UPAP authentication? */
+    int neg_chap : 1;		/* Ask for CHAP authentication? */
+    int neg_magicnumber : 1;	/* Ask for magic number? */
+    int neg_pcompression : 1;	/* HDLC Protocol Field Compression? */
+    int neg_accompression : 1;	/* HDLC Address/Control Field Compression? */
+    int neg_lqr : 1;		/* Negotiate use of Link Quality Reports */
+    u_short mru;		/* Value of MRU */
+    u_char chap_mdtype;		/* which MD type (hashing algorithm) */
+    u_long asyncmap;		/* Value of async map */
+    u_long magicnumber;
+    int numloops;		/* Number of loops during magic number neg. */
+    u_long lqr_period;		/* Reporting period for link quality */
+} lcp_options;
+
+extern fsm lcp_fsm[];
+extern lcp_options lcp_wantoptions[];
+extern lcp_options lcp_gotoptions[];
+extern lcp_options lcp_allowoptions[];
+extern lcp_options lcp_hisoptions[];
+extern u_long xmit_accm[][8];
+
+#define DEFMRU	1500		/* Try for this */
+#define MINMRU	128		/* No MRUs below this */
+#define MAXMRU	16384		/* Normally limit MRU to this */
+
+void lcp_init __ARGS((int));
+void lcp_open __ARGS((int));
+void lcp_close __ARGS((int));
+void lcp_lowerup __ARGS((int));
+void lcp_lowerdown __ARGS((int));
+void lcp_input __ARGS((int, u_char *, int));
+void lcp_protrej __ARGS((int));
+void lcp_sprotrej __ARGS((int, u_char *, int));
+int  lcp_printpkt __ARGS((u_char *, int,
+			  void (*) __ARGS((void *, char *, ...)), void *));
+
+extern int lcp_warnloops;	/* Warn about a loopback this often */
+#define DEFWARNLOOPS	10	/* Default value for above */