ppp.h

lwip-1.4.0

/*****************************************************************************
* ppp.h - Network Point to Point Protocol header file.
*
* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
* portions Copyright (c) 1997 Global Election Systems Inc.
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice and the following disclaimer are included verbatim in any 
* distributions. No written agreement, license, or royalty fee is required
* for any of the authorized uses.
*
* THIS SOFTWARE IS PROVIDED BY THE 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 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.
*
******************************************************************************
* REVISION HISTORY
*
* 03-01-01 Marc Boucher <[e-mail]>
*   Ported to lwIP.
* 97-11-05 Guy Lancaster <[e-mail]>, Global Election Systems Inc.
*   Original derived from BSD codes.
*****************************************************************************/

#ifndef PPP_H
#define PPP_H

#include "lwip/opt.h"

#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#include "lwip/def.h"
#include "lwip/sio.h"
#include "lwip/stats.h"
#include "lwip/mem.h"
#include "lwip/netif.h"
#include "lwip/sys.h"
#include "lwip/timers.h"

/** Some defines for code we skip compared to the original pppd.
 *  These are just here to minimise the use of the ugly "#if 0". */
#define PPP_ADDITIONAL_CALLBACKS  0

/** Some error checks to test for unsupported code */
#if CBCP_SUPPORT
#error "CBCP is not supported in lwIP PPP"
#endif
#if CCP_SUPPORT
#error "CCP is not supported in lwIP PPP"
#endif

/*
 * pppd.h - PPP daemon global declarations.
 *
 * 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.
 *
 */
/*
 * ppp_defs.h - PPP definitions.
 *
 * Copyright (c) 1994 The Australian National University.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.  This software is provided without any
 * warranty, express or implied. The Australian National University
 * makes no representations about the suitability of this software for
 * any purpose.
 *
 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
 * OR MODIFICATIONS.
 */

#define TIMEOUT(f, a, t)    do { sys_untimeout((f), (a)); sys_timeout((t)*1000, (f), (a)); } while(0)
#define UNTIMEOUT(f, a)     sys_untimeout((f), (a))


#ifndef __u_char_defined

/* Type definitions for BSD code. */
typedef unsigned long  u_long;
typedef unsigned int   u_int;
typedef unsigned short u_short;
typedef unsigned char  u_char;

#endif

/*
 * Constants and structures defined by the internet system,
 * Per RFC 790, September 1981, and numerous additions.
 */

/*
 * The basic PPP frame.
 */
#define PPP_HDRLEN      4       /* octets for standard ppp header */
#define PPP_FCSLEN      2       /* octets for FCS */


/*
 * Significant octet values.
 */
#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 field values.
 */
#define PPP_IP          0x21    /* Internet Protocol */
#define PPP_AT          0x29    /* AppleTalk Protocol */
#define PPP_VJC_COMP    0x2d    /* VJ compressed TCP */
#define PPP_VJC_UNCOMP  0x2f    /* VJ uncompressed TCP */
#define PPP_COMP        0xfd    /* compressed packet */
#define PPP_IPCP        0x8021  /* IP Control Protocol */
#define PPP_ATCP        0x8029  /* AppleTalk Control Protocol */
#define PPP_CCP         0x80fd  /* Compression Control Protocol */
#define PPP_LCP         0xc021  /* Link Control Protocol */
#define PPP_PAP         0xc023  /* Password Authentication Protocol */
#define PPP_LQR         0xc025  /* Link Quality Report protocol */
#define PPP_CHAP        0xc223  /* Cryptographic Handshake Auth. Protocol */
#define PPP_CBCP        0xc029  /* Callback Control Protocol */

/*
 * Values for FCS calculations.
 */
#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])

/*
 * Extended asyncmap - allows any character to be escaped.
 */
typedef u_char  ext_accm[32];

/*
 * What to do with network protocol (NP) packets.
 */
enum NPmode {
  NPMODE_PASS,        /* pass the packet through */
  NPMODE_DROP,        /* silently drop the packet */
  NPMODE_ERROR,       /* return an error */
  NPMODE_QUEUE        /* save it up for later. */
};

/*
 * Inline versions of get/put char/short/long.
 * Pointer is advanced; we assume that both arguments
 * are lvalues and will already be in registers.
 * cp MUST be u_char *.
 */
#define GETCHAR(c, cp) { \
    (c) = *(cp)++; \
}
#define PUTCHAR(c, cp) { \
    *(cp)++ = (u_char) (c); \
}


#define GETSHORT(s, cp) { \
    (s) = *(cp); (cp)++; (s) <<= 8; \
    (s) |= *(cp); (cp)++; \
}
#define PUTSHORT(s, cp) { \
    *(cp)++ = (u_char) ((s) >> 8); \
    *(cp)++ = (u_char) (s & 0xff); \
}

#define GETLONG(l, cp) { \
    (l) = *(cp); (cp)++; (l) <<= 8; \
    (l) |= *(cp); (cp)++; (l) <<= 8; \
    (l) |= *(cp); (cp)++; (l) <<= 8; \
    (l) |= *(cp); (cp)++; \
}
#define PUTLONG(l, cp) { \
    *(cp)++ = (u_char) ((l) >> 24); \
    *(cp)++ = (u_char) ((l) >> 16); \
    *(cp)++ = (u_char) ((l) >> 8); \
    *(cp)++ = (u_char) (l); \
}


#define INCPTR(n, cp)   ((cp) += (n))
#define DECPTR(n, cp)   ((cp) -= (n))

#define BCMP(s0, s1, l)     memcmp((u_char *)(s0), (u_char *)(s1), (l))
#define BCOPY(s, d, l)      MEMCPY((d), (s), (l))
#define BZERO(s, n)         memset(s, 0, n)

#if PPP_DEBUG
#define PRINTMSG(m, l)  { m[l] = '\0'; LWIP_DEBUGF(LOG_INFO, ("Remote message: %s\n", m)); }
#else  /* PPP_DEBUG */
#define PRINTMSG(m, l)
#endif /* PPP_DEBUG */

/*
 * MAKEHEADER - Add PPP Header fields to a packet.
 */
#define MAKEHEADER(p, t) { \
    PUTCHAR(PPP_ALLSTATIONS, p); \
    PUTCHAR(PPP_UI, p); \
    PUTSHORT(t, p); }

/*************************
*** PUBLIC DEFINITIONS ***
*************************/