--- /dev/null
+/*
+ * if_ppp.h - Point-to-Point 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.
+ *
+ * Modified by Paul Mackerras (paulus@cs.anu.edu.au)
+ * Added PPP_MRU, sc_outm, sc_fastq, sc_bpf.
+ *
+ * if_ppp.h,v 1.2 1993/08/31 00:05:31 paulus Exp
+ */
+
+/* Portions Copyright (C) 1990 Brad K. Clements (streams support)
+ (huh? there isn't any streams support in this file)
+*/
+
+/*
+ * Standard PPP header.
+ */
+struct ppp_header {
+ u_char ph_address; /* Address Field */
+ u_char ph_control; /* Control Field */
+ u_short ph_protocol; /* Protocol Field */
+};
+
+#define PPP_HEADER_LEN 4 /* octets, must == sizeof(struct ppp_header) */
+#define PPP_FCS_LEN 2 /* octets for FCS */
+
+#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
+#define PPP_UI 0x03 /* Unnumbered Information */
+#define PPP_FLAG 0x7e /* Flag Sequence */
+#define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */
+#define PPP_TRANS 0x20 /* Asynchronous transparency modifier */
+
+/*
+ * Protocol types.
+ */
+#define PPP_IP 0x21 /* Internet Protocol */
+#define PPP_XNS 0x25 /* Xerox NS */
+#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
+#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
+#define PPP_LCP 0xc021 /* Link Control Protocol */
+
+/*
+ * Important FCS values.
+ */
+#define PPP_INITFCS 0xffff /* Initial FCS value */
+#define PPP_GOODFCS 0xf0b8 /* Good final FCS value */
+#define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
+
+#define PPP_MTU 1500 /* Default MTU (size of Info field) */
+#define PPP_MRU 1500 /* Default MRU (max receive unit) */
+#define PPP_MAXMRU 65000 /* Largest MRU we allow */
+#define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
+
+struct ppp_softc {
+ struct ifnet sc_if; /* network-visible interface */
+ u_int sc_flags; /* see below */
+ struct tty *sc_ttyp; /* pointer to tty structure */
+ struct mbuf *sc_outm; /* mbuf chain being output currently */
+ struct mbuf *sc_m; /* pointer to input mbuf chain */
+ struct mbuf *sc_mc; /* pointer to current input mbuf */
+ char *sc_mp; /* pointer to next char in input mbuf */
+ short sc_ilen; /* length of input-packet-so-far */
+ u_short sc_fcs; /* FCS so far (input) */
+ u_short sc_outfcs; /* FCS so far for output packet */
+ short sc_mru; /* max receive unit */
+ u_long sc_asyncmap; /* async control character map */
+ u_long sc_rasyncmap; /* receive async control char map */
+ struct ifqueue sc_inq; /* TTY side input queue */
+ struct ifqueue sc_fastq; /* IP interactive output packet queue */
+#ifdef VJC
+ struct slcompress sc_comp; /* vjc control buffer */
+#endif
+ u_int sc_bytessent;
+ u_int sc_bytesrcvd;
+ caddr_t sc_bpf;
+};
+
+/* flags */
+#define SC_COMP_PROT 0x00000001 /* protocol compression (output) */
+#define SC_COMP_AC 0x00000002 /* header compression (output) */
+#define SC_COMP_TCP 0x00000004 /* TCP (VJ) compression (output) */
+#define SC_NO_TCP_CCID 0x00000008 /* disable VJ connection-id comp. */
+#define SC_REJ_COMP_AC 0x00000010 /* reject adrs/ctrl comp. on input */
+#define SC_REJ_COMP_TCP 0x00000020 /* reject TCP (VJ) comp. on input */
+#define SC_MASK 0x0000ffff /* bits that user can change */
+
+/* state bits */
+#define SC_ESCAPED 0x00010000 /* saw a PPP_ESCAPE */
+#define SC_FLUSH 0x00020000 /* flush input until next PPP_FLAG */
+
+#define t_sc T_LINEP
+
+/* this stuff doesn't belong here... */
+#define PPPIOCGFLAGS _IOR('t', 90, int) /* get configuration flags */
+#define PPPIOCSFLAGS _IOW('t', 89, int) /* set configuration flags */
+#define PPPIOCGASYNCMAP _IOR('t', 88, int) /* get async map */
+#define PPPIOCSASYNCMAP _IOW('t', 87, int) /* set async map */
+#define PPPIOCGUNIT _IOR('t', 86, int) /* get ppp unit number */
+#define PPPIOCGRASYNCMAP _IOR('t', 85, int) /* get receive async map */
+#define PPPIOCSRASYNCMAP _IOW('t', 84, int) /* set receive async map */
+#define PPPIOCGMRU _IOR('t', 83, int) /* get max receive unit */
+#define PPPIOCSMRU _IOW('t', 82, int) /* set max receive unit */
+
+/* old copies of PPP may have defined this */
+#if !defined(ifr_mtu)
+#define ifr_mtu ifr_metric
+#endif
+
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