447 lines
15 KiB
C
447 lines
15 KiB
C
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/*****************************************************************************
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* ppp.h - Network Point to Point Protocol header file.
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*
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* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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* portions Copyright (c) 1997 Global Election Systems Inc.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice and the following disclaimer are included verbatim in any
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* distributions. No written agreement, license, or royalty fee is required
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* for any of the authorized uses.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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* REVISION HISTORY
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*
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* 03-01-01 Marc Boucher <marc@mbsi.ca>
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* Ported to lwIP.
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* 97-11-05 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
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* Original derived from BSD codes.
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*****************************************************************************/
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#ifndef PPP_H
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#define PPP_H
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#include "lwip/opt.h"
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#if PPP_SUPPORT > 0
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#include "lwip/sio.h"
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#include "lwip/api.h"
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#include "lwip/sockets.h"
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#include "lwip/stats.h"
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#include "lwip/mem.h"
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#include "lwip/tcpip.h"
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#include "lwip/netif.h"
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/*
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* pppd.h - PPP daemon global declarations.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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/*
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* ppp_defs.h - PPP definitions.
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*
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* Copyright (c) 1994 The Australian National University.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, provided that the above copyright
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* notice appears in all copies. This software is provided without any
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* warranty, express or implied. The Australian National University
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* makes no representations about the suitability of this software for
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* any purpose.
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*
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* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
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* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
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* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
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* OR MODIFICATIONS.
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*/
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#define TIMEOUT(f, a, t) sys_untimeout((f), (a)), sys_timeout((t)*1000, (f), (a))
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#define UNTIMEOUT(f, a) sys_untimeout((f), (a))
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# ifndef __u_char_defined
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/* Type definitions for BSD code. */
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typedef unsigned long u_long;
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typedef unsigned int u_int;
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typedef unsigned short u_short;
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typedef unsigned char u_char;
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#endif
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/*
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* Constants and structures defined by the internet system,
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* Per RFC 790, September 1981, and numerous additions.
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*/
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/*
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* The basic PPP frame.
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*/
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#define PPP_HDRLEN 4 /* octets for standard ppp header */
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#define PPP_FCSLEN 2 /* octets for FCS */
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/*
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* Significant octet values.
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*/
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#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
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#define PPP_UI 0x03 /* Unnumbered Information */
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#define PPP_FLAG 0x7e /* Flag Sequence */
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#define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */
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#define PPP_TRANS 0x20 /* Asynchronous transparency modifier */
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/*
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* Protocol field values.
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*/
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#define PPP_IP 0x21 /* Internet Protocol */
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#define PPP_AT 0x29 /* AppleTalk Protocol */
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#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
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#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
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#define PPP_COMP 0xfd /* compressed packet */
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#define PPP_IPCP 0x8021 /* IP Control Protocol */
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#define PPP_ATCP 0x8029 /* AppleTalk Control Protocol */
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#define PPP_CCP 0x80fd /* Compression Control Protocol */
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#define PPP_LCP 0xc021 /* Link Control Protocol */
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#define PPP_PAP 0xc023 /* Password Authentication Protocol */
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#define PPP_LQR 0xc025 /* Link Quality Report protocol */
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#define PPP_CHAP 0xc223 /* Cryptographic Handshake Auth. Protocol */
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#define PPP_CBCP 0xc029 /* Callback Control Protocol */
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/*
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* Values for FCS calculations.
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*/
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#define PPP_INITFCS 0xffff /* Initial FCS value */
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#define PPP_GOODFCS 0xf0b8 /* Good final FCS value */
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#define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
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/*
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* Extended asyncmap - allows any character to be escaped.
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*/
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typedef u_char ext_accm[32];
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/*
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* What to do with network protocol (NP) packets.
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*/
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enum NPmode {
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NPMODE_PASS, /* pass the packet through */
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NPMODE_DROP, /* silently drop the packet */
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NPMODE_ERROR, /* return an error */
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NPMODE_QUEUE /* save it up for later. */
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};
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/*
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* Inline versions of get/put char/short/long.
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* Pointer is advanced; we assume that both arguments
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* are lvalues and will already be in registers.
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* cp MUST be u_char *.
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*/
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#define GETCHAR(c, cp) { \
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(c) = *(cp)++; \
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}
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#define PUTCHAR(c, cp) { \
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*(cp)++ = (u_char) (c); \
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}
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#define GETSHORT(s, cp) { \
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(s) = *(cp); (cp)++; (s) << 8; \
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(s) |= *(cp); (cp)++; \
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}
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#define PUTSHORT(s, cp) { \
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*(cp)++ = (u_char) ((s) >> 8); \
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*(cp)++ = (u_char) (s); \
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}
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#define GETLONG(l, cp) { \
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(l) = *(cp); (cp)++; (l) << 8; \
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(l) |= *(cp); (cp)++; (l) <<= 8; \
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(l) |= *(cp); (cp)++; (l) <<= 8; \
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(l) |= *(cp); (cp)++; \
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}
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#define PUTLONG(l, cp) { \
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*(cp)++ = (u_char) ((l) >> 24); \
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*(cp)++ = (u_char) ((l) >> 16); \
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*(cp)++ = (u_char) ((l) >> 8); \
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*(cp)++ = (u_char) (l); \
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}
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#define INCPTR(n, cp) ((cp) += (n))
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#define DECPTR(n, cp) ((cp) -= (n))
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#define BCMP(s0, s1, l) memcmp((u_char *)(s0), (u_char *)(s1), (l))
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#define BCOPY(s, d, l) memcpy((d), (s), (l))
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#define BZERO(s, n) memset(s, 0, n)
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#if PPP_DEBUG
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#define PRINTMSG(m, l) { m[l] = '\0'; ppp_trace(LOG_INFO, "Remote message: %s\n", m); }
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#else
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#define PRINTMSG(m, l)
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#endif
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/*
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* MAKEHEADER - Add PPP Header fields to a packet.
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*/
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#define MAKEHEADER(p, t) { \
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PUTCHAR(PPP_ALLSTATIONS, p); \
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PUTCHAR(PPP_UI, p); \
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PUTSHORT(t, p); }
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/*************************
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*** PUBLIC DEFINITIONS ***
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*************************/
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/* Error codes. */
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#define PPPERR_NONE 0 /* No error. */
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#define PPPERR_PARAM -1 /* Invalid parameter. */
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#define PPPERR_OPEN -2 /* Unable to open PPP session. */
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#define PPPERR_DEVICE -3 /* Invalid I/O device for PPP. */
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#define PPPERR_ALLOC -4 /* Unable to allocate resources. */
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#define PPPERR_USER -5 /* User interrupt. */
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#define PPPERR_CONNECT -6 /* Connection lost. */
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#define PPPERR_AUTHFAIL -7 /* Failed authentication challenge. */
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#define PPPERR_PROTOCOL -8 /* Failed to meet protocol. */
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/*
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* PPP IOCTL commands.
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*/
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/*
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* Get the up status - 0 for down, non-zero for up. The argument must
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* point to an int.
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*/
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#define PPPCTLG_UPSTATUS 100 /* Get the up status - 0 down else up */
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#define PPPCTLS_ERRCODE 101 /* Set the error code */
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#define PPPCTLG_ERRCODE 102 /* Get the error code */
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#define PPPCTLG_FD 103 /* Get the fd associated with the ppp */
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/************************
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*** PUBLIC DATA TYPES ***
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************************/
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/*
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* The following struct gives the addresses of procedures to call
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* for a particular protocol.
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*/
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struct protent {
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u_short protocol; /* PPP protocol number */
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/* Initialization procedure */
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void (*init) (int unit);
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/* Process a received packet */
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void (*input) (int unit, u_char *pkt, int len);
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/* Process a received protocol-reject */
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void (*protrej) (int unit);
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/* Lower layer has come up */
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void (*lowerup) (int unit);
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/* Lower layer has gone down */
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void (*lowerdown) (int unit);
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/* Open the protocol */
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void (*open) (int unit);
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/* Close the protocol */
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void (*close) (int unit, char *reason);
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#if 0
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/* Print a packet in readable form */
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int (*printpkt) (u_char *pkt, int len,
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void (*printer) (void *, char *, ...),
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void *arg);
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/* Process a received data packet */
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void (*datainput) (int unit, u_char *pkt, int len);
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#endif
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int enabled_flag; /* 0 iff protocol is disabled */
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char *name; /* Text name of protocol */
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#if 0
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/* Check requested options, assign defaults */
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void (*check_options) (u_long);
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/* Configure interface for demand-dial */
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int (*demand_conf) (int unit);
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/* Say whether to bring up link for this pkt */
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int (*active_pkt) (u_char *pkt, int len);
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#endif
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};
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/*
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* The following structure records the time in seconds since
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* the last NP packet was sent or received.
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*/
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struct ppp_idle {
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u_short xmit_idle; /* seconds since last NP packet sent */
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u_short recv_idle; /* seconds since last NP packet received */
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};
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struct ppp_settings {
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u_int disable_defaultip : 1; /* Don't use hostname for default IP addrs */
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u_int auth_required : 1; /* Peer is required to authenticate */
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u_int explicit_remote : 1; /* remote_name specified with remotename opt */
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u_int refuse_pap : 1; /* Don't wanna auth. ourselves with PAP */
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u_int refuse_chap : 1; /* Don't wanna auth. ourselves with CHAP */
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u_int usehostname : 1; /* Use hostname for our_name */
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u_int usepeerdns : 1; /* Ask peer for DNS adds */
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u_short idle_time_limit; /* Shut down link if idle for this long */
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int maxconnect; /* Maximum connect time (seconds) */
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char user[MAXNAMELEN + 1];/* Username for PAP */
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char passwd[MAXSECRETLEN + 1]; /* Password for PAP, secret for CHAP */
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char our_name[MAXNAMELEN + 1]; /* Our name for authentication purposes */
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char remote_name[MAXNAMELEN + 1]; /* Peer's name for authentication */
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};
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struct ppp_addrs {
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struct ip_addr our_ipaddr, his_ipaddr, netmask, dns1, dns2;
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};
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/*****************************
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*** PUBLIC DATA STRUCTURES ***
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*****************************/
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/* Buffers for outgoing packets. */
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extern u_char outpacket_buf[NUM_PPP][PPP_MRU+PPP_HDRLEN];
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extern struct ppp_settings ppp_settings;
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extern struct protent *ppp_protocols[];/* Table of pointers to supported protocols */
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/***********************
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*** PUBLIC FUNCTIONS ***
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***********************/
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/* Initialize the PPP subsystem. */
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void pppInit(void);
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/* Warning: Using PPPAUTHTYPE_ANY might have security consequences.
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* RFC 1994 says:
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*
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* In practice, within or associated with each PPP server, there is a
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* database which associates "user" names with authentication
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* information ("secrets"). It is not anticipated that a particular
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* named user would be authenticated by multiple methods. This would
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* make the user vulnerable to attacks which negotiate the least secure
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* method from among a set (such as PAP rather than CHAP). If the same
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|
|
* secret was used, PAP would reveal the secret to be used later with
|
||
|
|
* CHAP.
|
||
|
|
*
|
||
|
|
* Instead, for each user name there should be an indication of exactly
|
||
|
|
* one method used to authenticate that user name. If a user needs to
|
||
|
|
* make use of different authentication methods under different
|
||
|
|
* circumstances, then distinct user names SHOULD be employed, each of
|
||
|
|
* which identifies exactly one authentication method.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
enum pppAuthType {
|
||
|
|
PPPAUTHTYPE_NONE,
|
||
|
|
PPPAUTHTYPE_ANY,
|
||
|
|
PPPAUTHTYPE_PAP,
|
||
|
|
PPPAUTHTYPE_CHAP
|
||
|
|
};
|
||
|
|
|
||
|
|
void pppSetAuth(enum pppAuthType authType, const char *user, const char *passwd);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Open a new PPP connection using the given I/O device.
|
||
|
|
* This initializes the PPP control block but does not
|
||
|
|
* attempt to negotiate the LCP session.
|
||
|
|
* Return a new PPP connection descriptor on success or
|
||
|
|
* an error code (negative) on failure.
|
||
|
|
*/
|
||
|
|
int pppOpen(sio_fd_t fd, void (*linkStatusCB)(void *ctx, int errCode, void *arg), void *linkStatusCtx);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Close a PPP connection and release the descriptor.
|
||
|
|
* Any outstanding packets in the queues are dropped.
|
||
|
|
* Return 0 on success, an error code on failure.
|
||
|
|
*/
|
||
|
|
int pppClose(int pd);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Indicate to the PPP process that the line has disconnected.
|
||
|
|
*/
|
||
|
|
void pppSigHUP(int pd);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get and set parameters for the given connection.
|
||
|
|
* Return 0 on success, an error code on failure.
|
||
|
|
*/
|
||
|
|
int pppIOCtl(int pd, int cmd, void *arg);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Return the Maximum Transmission Unit for the given PPP connection.
|
||
|
|
*/
|
||
|
|
u_int pppMTU(int pd);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Write n characters to a ppp link.
|
||
|
|
* RETURN: >= 0 Number of characters written
|
||
|
|
* -1 Failed to write to device
|
||
|
|
*/
|
||
|
|
int pppWrite(int pd, const u_char *s, int n);
|
||
|
|
|
||
|
|
void pppMainWakeup(int pd);
|
||
|
|
|
||
|
|
/* Configure i/f transmit parameters */
|
||
|
|
void ppp_send_config (int, int, u32_t, int, int);
|
||
|
|
/* Set extended transmit ACCM */
|
||
|
|
void ppp_set_xaccm (int, ext_accm *);
|
||
|
|
/* Configure i/f receive parameters */
|
||
|
|
void ppp_recv_config (int, int, u32_t, int, int);
|
||
|
|
/* Find out how long link has been idle */
|
||
|
|
int get_idle_time (int, struct ppp_idle *);
|
||
|
|
|
||
|
|
/* Configure VJ TCP header compression */
|
||
|
|
int sifvjcomp (int, int, int, int);
|
||
|
|
/* Configure i/f down (for IP) */
|
||
|
|
int sifup (int);
|
||
|
|
/* Set mode for handling packets for proto */
|
||
|
|
int sifnpmode (int u, int proto, enum NPmode mode);
|
||
|
|
/* Configure i/f down (for IP) */
|
||
|
|
int sifdown (int);
|
||
|
|
/* Configure IP addresses for i/f */
|
||
|
|
int sifaddr (int, u32_t, u32_t, u32_t, u32_t, u32_t);
|
||
|
|
/* Reset i/f IP addresses */
|
||
|
|
int cifaddr (int, u32_t, u32_t);
|
||
|
|
/* Create default route through i/f */
|
||
|
|
int sifdefaultroute (int, u32_t, u32_t);
|
||
|
|
/* Delete default route through i/f */
|
||
|
|
int cifdefaultroute (int, u32_t, u32_t);
|
||
|
|
|
||
|
|
/* Get appropriate netmask for address */
|
||
|
|
u32_t GetMask (u32_t);
|
||
|
|
|
||
|
|
#endif /* PPP_SUPPORT */
|
||
|
|
|
||
|
|
#endif /* PPP_H */
|