1632 lines
49 KiB
C
1632 lines
49 KiB
C
/*****************************************************************************
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* ppp.c - Network Point to Point Protocol program 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 by 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 <lancasterg@acm.org>, Global Election Systems Inc.
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* Original.
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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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* if_pppvar.h - private structures and declarations for PPP.
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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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/*
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* if_ppp.h - Point-to-Point Protocol definitions.
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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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <string.h>
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#include "ppp.h"
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#if PPP_SUPPORT > 0
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#include "randm.h"
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#include "fsm.h"
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#if PAP_SUPPORT > 0
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#include "pap.h"
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#endif
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#if CHAP_SUPPORT > 0
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#include "chap.h"
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#endif
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#include "ipcp.h"
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#include "lcp.h"
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#include "magic.h"
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#include "auth.h"
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#if VJ_SUPPORT > 0
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#include "vj.h"
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#endif
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#include "pppdebug.h"
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/*************************/
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/*** LOCAL DEFINITIONS ***/
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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_ADDRESS(p) (((u_char *)(p))[0])
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#define PPP_CONTROL(p) (((u_char *)(p))[1])
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#define PPP_PROTOCOL(p) ((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])
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/* PPP packet parser states. Current state indicates operation yet to be
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* completed. */
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typedef enum {
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PDIDLE = 0, /* Idle state - waiting. */
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PDSTART, /* Process start flag. */
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PDADDRESS, /* Process address field. */
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PDCONTROL, /* Process control field. */
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PDPROTOCOL1, /* Process protocol field 1. */
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PDPROTOCOL2, /* Process protocol field 2. */
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PDDATA /* Process data byte. */
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} PPPDevStates;
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#define ESCAPE_P(accm, c) ((accm)[(c) >> 3] & pppACCMMask[c & 0x07])
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/************************/
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/*** LOCAL DATA TYPES ***/
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/************************/
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/*
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* PPP interface control block.
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*/
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typedef struct PPPControl_s {
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char openFlag; /* True when in use. */
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char oldFrame; /* Old framing character for fd. */
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sio_fd_t fd; /* File device ID of port. */
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int kill_link; /* Shut the link down. */
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int sig_hup; /* Carrier lost. */
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int if_up; /* True when the interface is up. */
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int errCode; /* Code indicating why interface is down. */
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struct pbuf *inHead, *inTail; /* The input packet. */
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PPPDevStates inState; /* The input process state. */
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char inEscaped; /* Escape next character. */
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u16_t inProtocol; /* The input protocol code. */
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u16_t inFCS; /* Input Frame Check Sequence value. */
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int mtu; /* Peer's mru */
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int pcomp; /* Does peer accept protocol compression? */
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int accomp; /* Does peer accept addr/ctl compression? */
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u_long lastXMit; /* Time of last transmission. */
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ext_accm inACCM; /* Async-Ctl-Char-Map for input. */
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ext_accm outACCM; /* Async-Ctl-Char-Map for output. */
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#if VJ_SUPPORT > 0
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int vjEnabled; /* Flag indicating VJ compression enabled. */
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struct vjcompress vjComp; /* Van Jabobsen compression header. */
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#endif
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struct netif netif;
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struct ppp_addrs addrs;
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void (*linkStatusCB)(void *ctx, int errCode, void *arg);
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void *linkStatusCtx;
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} PPPControl;
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/*
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* Ioctl definitions.
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*/
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struct npioctl {
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int protocol; /* PPP procotol, e.g. PPP_IP */
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enum NPmode mode;
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};
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/***********************************/
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/*** LOCAL FUNCTION DECLARATIONS ***/
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/***********************************/
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static void pppMain(void *pd);
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static void pppDrop(PPPControl *pc);
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static void pppInProc(int pd, u_char *s, int l);
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/******************************/
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/*** PUBLIC DATA STRUCTURES ***/
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/******************************/
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u_long subnetMask;
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static PPPControl pppControl[NUM_PPP]; /* The PPP interface control blocks. */
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/*
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* PPP Data Link Layer "protocol" table.
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* One entry per supported protocol.
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* The last entry must be NULL.
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*/
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struct protent *ppp_protocols[] = {
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&lcp_protent,
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#if PAP_SUPPORT > 0
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&pap_protent,
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#endif
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#if CHAP_SUPPORT > 0
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&chap_protent,
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#endif
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#if CBCP_SUPPORT > 0
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&cbcp_protent,
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#endif
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&ipcp_protent,
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#if CCP_SUPPORT > 0
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&ccp_protent,
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#endif
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NULL
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};
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/*
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* Buffers for outgoing packets. This must be accessed only from the appropriate
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* PPP task so that it doesn't need to be protected to avoid collisions.
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*/
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u_char outpacket_buf[NUM_PPP][PPP_MRU+PPP_HDRLEN];
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/*****************************/
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/*** LOCAL DATA STRUCTURES ***/
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/*****************************/
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/*
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* FCS lookup table as calculated by genfcstab.
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*/
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static const u_short fcstab[256] = {
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0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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/* PPP's Asynchronous-Control-Character-Map. The mask array is used
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* to select the specific bit for a character. */
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static u_char pppACCMMask[] = {
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0x01,
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0x02,
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0x04,
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0x08,
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0x10,
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0x20,
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0x40,
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0x80
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};
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/***********************************/
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/*** PUBLIC FUNCTION DEFINITIONS ***/
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/***********************************/
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/* Initialize the PPP subsystem. */
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struct ppp_settings ppp_settings;
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void pppInit(void)
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{
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struct protent *protp;
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int i, j;
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memset(&ppp_settings, 0, sizeof(ppp_settings));
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ppp_settings.usepeerdns = 1;
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pppSetAuth(PPPAUTHTYPE_NONE, NULL, NULL);
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magicInit();
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for (i = 0; i < NUM_PPP; i++) {
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pppControl[i].openFlag = 0;
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subnetMask = htonl(0xffffff00);
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/*
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* Initialize to the standard option set.
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*/
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for (j = 0; (protp = ppp_protocols[j]) != NULL; ++j)
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(*protp->init)(i);
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}
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#if LINK_STATS
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/* Clear the statistics. */
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memset(&lwip_stats.link, 0, sizeof(lwip_stats.link));
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#endif
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}
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void pppSetAuth(enum pppAuthType authType, const char *user, const char *passwd)
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{
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switch(authType) {
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case PPPAUTHTYPE_NONE:
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default:
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#ifdef LWIP_PPP_STRICT_PAP_REJECT
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ppp_settings.refuse_pap = 1;
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#else
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/* some providers request pap and accept an empty login/pw */
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ppp_settings.refuse_pap = 0;
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#endif
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ppp_settings.refuse_chap = 1;
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break;
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case PPPAUTHTYPE_ANY:
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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
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* CHAP.
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*
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* Instead, for each user name there should be an indication of exactly
|
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* one method used to authenticate that user name. If a user needs to
|
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* make use of different authentication methods under different
|
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* circumstances, then distinct user names SHOULD be employed, each of
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* which identifies exactly one authentication method.
|
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*
|
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*/
|
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ppp_settings.refuse_pap = 0;
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ppp_settings.refuse_chap = 0;
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break;
|
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case PPPAUTHTYPE_PAP:
|
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ppp_settings.refuse_pap = 0;
|
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ppp_settings.refuse_chap = 1;
|
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break;
|
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case PPPAUTHTYPE_CHAP:
|
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ppp_settings.refuse_pap = 1;
|
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ppp_settings.refuse_chap = 0;
|
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break;
|
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}
|
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|
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if(user) {
|
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strncpy(ppp_settings.user, user, sizeof(ppp_settings.user)-1);
|
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ppp_settings.user[sizeof(ppp_settings.user)-1] = '\0';
|
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} else
|
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ppp_settings.user[0] = '\0';
|
|
|
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if(passwd) {
|
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strncpy(ppp_settings.passwd, passwd, sizeof(ppp_settings.passwd)-1);
|
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ppp_settings.passwd[sizeof(ppp_settings.passwd)-1] = '\0';
|
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} else
|
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ppp_settings.passwd[0] = '\0';
|
|
}
|
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|
|
/* 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. If this port
|
|
* connects to a modem, the modem connection must be
|
|
* established before calling this.
|
|
* 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)
|
|
{
|
|
PPPControl *pc;
|
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int pd;
|
|
|
|
/* Find a free PPP session descriptor. Critical region? */
|
|
for (pd = 0; pd < NUM_PPP && pppControl[pd].openFlag != 0; pd++);
|
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if (pd >= NUM_PPP)
|
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pd = PPPERR_OPEN;
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else
|
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pppControl[pd].openFlag = !0;
|
|
|
|
/* Launch a deamon thread. */
|
|
if (pd >= 0) {
|
|
|
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pppControl[pd].openFlag = 1;
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|
|
|
lcp_init(pd);
|
|
pc = &pppControl[pd];
|
|
pc->fd = fd;
|
|
pc->kill_link = 0;
|
|
pc->sig_hup = 0;
|
|
pc->if_up = 0;
|
|
pc->errCode = 0;
|
|
pc->inState = PDIDLE;
|
|
pc->inHead = NULL;
|
|
pc->inTail = NULL;
|
|
pc->inEscaped = 0;
|
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pc->lastXMit = 0;
|
|
|
|
#if VJ_SUPPORT > 0
|
|
pc->vjEnabled = 0;
|
|
vj_compress_init(&pc->vjComp);
|
|
#endif
|
|
|
|
/*
|
|
* Default the in and out accm so that escape and flag characters
|
|
* are always escaped.
|
|
*/
|
|
memset(pc->inACCM, 0, sizeof(ext_accm));
|
|
pc->inACCM[15] = 0x60;
|
|
memset(pc->outACCM, 0, sizeof(ext_accm));
|
|
pc->outACCM[15] = 0x60;
|
|
|
|
pc->linkStatusCB = linkStatusCB;
|
|
pc->linkStatusCtx = linkStatusCtx;
|
|
|
|
sys_thread_new(pppMain, (void*)pd, PPP_THREAD_PRIO);
|
|
if(!linkStatusCB) {
|
|
while(pd >= 0 && !pc->if_up) {
|
|
sys_msleep(500);
|
|
if (lcp_phase[pd] == PHASE_DEAD) {
|
|
pppClose(pd);
|
|
if (pc->errCode)
|
|
pd = pc->errCode;
|
|
else
|
|
pd = PPPERR_CONNECT;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return pd;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 0;
|
|
|
|
/* Disconnect */
|
|
pc->kill_link = !0;
|
|
pppMainWakeup(pd);
|
|
|
|
if(!pc->linkStatusCB) {
|
|
while(st >= 0 && lcp_phase[pd] != PHASE_DEAD) {
|
|
sys_msleep(500);
|
|
break;
|
|
}
|
|
}
|
|
return st;
|
|
}
|
|
|
|
/* This function is called when carrier is lost on the PPP channel. */
|
|
void pppSigHUP(int pd)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
|
|
pc->sig_hup = 1;
|
|
pppMainWakeup(pd);
|
|
}
|
|
|
|
static void nPut(PPPControl *pc, struct pbuf *nb)
|
|
{
|
|
struct pbuf *b;
|
|
int c;
|
|
|
|
for(b = nb; b != NULL; b = b->next) {
|
|
if((c = sio_write(pc->fd, b->payload, b->len)) != b->len) {
|
|
PPPDEBUG((LOG_WARNING,
|
|
"PPP nPut: incomplete sio_write(%d,, %u) = %d\n", pc->fd, b->len, c));
|
|
#if LINK_STATS
|
|
lwip_stats.link.err++;
|
|
#endif /* LINK_STATS */
|
|
pc->lastXMit = 0; /* prepend PPP_FLAG to next packet */
|
|
break;
|
|
}
|
|
}
|
|
pbuf_free(nb);
|
|
|
|
#if LINK_STATS
|
|
lwip_stats.link.xmit++;
|
|
#endif /* LINK_STATS */
|
|
}
|
|
|
|
/*
|
|
* pppAppend - append given character to end of given pbuf. If outACCM
|
|
* is not NULL and the character needs to be escaped, do so.
|
|
* If pbuf is full, append another.
|
|
* Return the current pbuf.
|
|
*/
|
|
static struct pbuf *pppAppend(u_char c, struct pbuf *nb, ext_accm *outACCM)
|
|
{
|
|
struct pbuf *tb = nb;
|
|
|
|
/* Make sure there is room for the character and an escape code.
|
|
* Sure we don't quite fill the buffer if the character doesn't
|
|
* get escaped but is one character worth complicating this? */
|
|
/* Note: We assume no packet header. */
|
|
if (nb && (PBUF_POOL_BUFSIZE - nb->len) < 2) {
|
|
tb = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
|
|
if (tb) {
|
|
nb->next = tb;
|
|
}
|
|
#if LINK_STATS
|
|
else {
|
|
lwip_stats.link.memerr++;
|
|
}
|
|
#endif /* LINK_STATS */
|
|
nb = tb;
|
|
}
|
|
if (nb) {
|
|
if (outACCM && ESCAPE_P(*outACCM, c)) {
|
|
*((u_char*)nb->payload + nb->len++) = PPP_ESCAPE;
|
|
*((u_char*)nb->payload + nb->len++) = c ^ PPP_TRANS;
|
|
}
|
|
else
|
|
*((u_char*)nb->payload + nb->len++) = c;
|
|
}
|
|
|
|
return tb;
|
|
}
|
|
|
|
/* Send a packet on the given connection. */
|
|
static err_t pppifOutput(struct netif *netif, struct pbuf *pb, struct ip_addr *ipaddr)
|
|
{
|
|
int pd = (int)netif->state;
|
|
u_short protocol = PPP_IP;
|
|
PPPControl *pc = &pppControl[pd];
|
|
u_int fcsOut = PPP_INITFCS;
|
|
struct pbuf *headMB = NULL, *tailMB = NULL, *p;
|
|
u_char c;
|
|
|
|
(void)ipaddr;
|
|
|
|
/* Validate parameters. */
|
|
/* We let any protocol value go through - it can't hurt us
|
|
* and the peer will just drop it if it's not accepting it. */
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag || !pb) {
|
|
PPPDEBUG((LOG_WARNING, "pppifOutput[%d]: bad parms prot=%d pb=%p\n",
|
|
pd, protocol, pb));
|
|
#if LINK_STATS
|
|
lwip_stats.link.opterr++;
|
|
lwip_stats.link.drop++;
|
|
#endif
|
|
return ERR_ARG;
|
|
}
|
|
|
|
/* Check that the link is up. */
|
|
if (lcp_phase[pd] == PHASE_DEAD) {
|
|
PPPDEBUG((LOG_ERR, "pppifOutput[%d]: link not up\n", pd));
|
|
#if LINK_STATS
|
|
lwip_stats.link.rterr++;
|
|
lwip_stats.link.drop++;
|
|
#endif
|
|
return ERR_RTE;
|
|
}
|
|
|
|
/* Grab an output buffer. */
|
|
headMB = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
|
|
if (headMB == NULL) {
|
|
PPPDEBUG((LOG_WARNING, "pppifOutput[%d]: first alloc fail\n", pd));
|
|
#if LINK_STATS
|
|
lwip_stats.link.memerr++;
|
|
lwip_stats.link.drop++;
|
|
#endif /* LINK_STATS */
|
|
return ERR_MEM;
|
|
}
|
|
|
|
#if VJ_SUPPORT > 0
|
|
/*
|
|
* Attempt Van Jacobson header compression if VJ is configured and
|
|
* this is an IP packet.
|
|
*/
|
|
if (protocol == PPP_IP && pc->vjEnabled) {
|
|
switch (vj_compress_tcp(&pc->vjComp, pb)) {
|
|
case TYPE_IP:
|
|
/* No change...
|
|
protocol = PPP_IP_PROTOCOL;
|
|
*/
|
|
break;
|
|
case TYPE_COMPRESSED_TCP:
|
|
protocol = PPP_VJC_COMP;
|
|
break;
|
|
case TYPE_UNCOMPRESSED_TCP:
|
|
protocol = PPP_VJC_UNCOMP;
|
|
break;
|
|
default:
|
|
PPPDEBUG((LOG_WARNING, "pppifOutput[%d]: bad IP packet\n", pd));
|
|
#if LINK_STATS
|
|
lwip_stats.link.proterr++;
|
|
lwip_stats.link.drop++;
|
|
#endif
|
|
pbuf_free(headMB);
|
|
return ERR_VAL;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
tailMB = headMB;
|
|
|
|
/* Build the PPP header. */
|
|
if ((sys_jiffies() - pc->lastXMit) >= PPP_MAXIDLEFLAG)
|
|
tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
|
|
pc->lastXMit = sys_jiffies();
|
|
if (!pc->accomp) {
|
|
fcsOut = PPP_FCS(fcsOut, PPP_ALLSTATIONS);
|
|
tailMB = pppAppend(PPP_ALLSTATIONS, tailMB, &pc->outACCM);
|
|
fcsOut = PPP_FCS(fcsOut, PPP_UI);
|
|
tailMB = pppAppend(PPP_UI, tailMB, &pc->outACCM);
|
|
}
|
|
if (!pc->pcomp || protocol > 0xFF) {
|
|
c = (protocol >> 8) & 0xFF;
|
|
fcsOut = PPP_FCS(fcsOut, c);
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
}
|
|
c = protocol & 0xFF;
|
|
fcsOut = PPP_FCS(fcsOut, c);
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
|
|
/* Load packet. */
|
|
for(p = pb; p; p = p->next) {
|
|
int n;
|
|
u_char *sPtr;
|
|
|
|
sPtr = (u_char*)p->payload;
|
|
n = p->len;
|
|
while (n-- > 0) {
|
|
c = *sPtr++;
|
|
|
|
/* Update FCS before checking for special characters. */
|
|
fcsOut = PPP_FCS(fcsOut, c);
|
|
|
|
/* Copy to output buffer escaping special characters. */
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
}
|
|
}
|
|
|
|
/* Add FCS and trailing flag. */
|
|
c = ~fcsOut & 0xFF;
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
c = (~fcsOut >> 8) & 0xFF;
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
|
|
|
|
/* If we failed to complete the packet, throw it away. */
|
|
if (!tailMB) {
|
|
PPPDEBUG((LOG_WARNING,
|
|
"pppifOutput[%d]: Alloc err - dropping proto=%d\n",
|
|
pd, protocol));
|
|
pbuf_free(headMB);
|
|
#if LINK_STATS
|
|
lwip_stats.link.memerr++;
|
|
lwip_stats.link.drop++;
|
|
#endif
|
|
return ERR_MEM;
|
|
}
|
|
|
|
/* Send it. */
|
|
PPPDEBUG((LOG_INFO, "pppifOutput[%d]: proto=0x%04X\n", pd, protocol));
|
|
|
|
nPut(pc, headMB);
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 0;
|
|
|
|
if (pd < 0 || pd >= NUM_PPP)
|
|
st = PPPERR_PARAM;
|
|
else {
|
|
switch(cmd) {
|
|
case PPPCTLG_UPSTATUS: /* Get the PPP up status. */
|
|
if (arg)
|
|
*(int *)arg = (int)(pc->if_up);
|
|
else
|
|
st = PPPERR_PARAM;
|
|
break;
|
|
case PPPCTLS_ERRCODE: /* Set the PPP error code. */
|
|
if (arg)
|
|
pc->errCode = *(int *)arg;
|
|
else
|
|
st = PPPERR_PARAM;
|
|
break;
|
|
case PPPCTLG_ERRCODE: /* Get the PPP error code. */
|
|
if (arg)
|
|
*(int *)arg = (int)(pc->errCode);
|
|
else
|
|
st = PPPERR_PARAM;
|
|
break;
|
|
case PPPCTLG_FD:
|
|
if (arg)
|
|
*(sio_fd_t *)arg = pc->fd;
|
|
else
|
|
st = PPPERR_PARAM;
|
|
break;
|
|
default:
|
|
st = PPPERR_PARAM;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* Return the Maximum Transmission Unit for the given PPP connection.
|
|
*/
|
|
u_int pppMTU(int pd)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
u_int st;
|
|
|
|
/* Validate parameters. */
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag)
|
|
st = 0;
|
|
else
|
|
st = pc->mtu;
|
|
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
u_char c;
|
|
u_int fcsOut = PPP_INITFCS;
|
|
struct pbuf *headMB = NULL, *tailMB;
|
|
headMB = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
|
|
if (headMB == NULL) {
|
|
#if LINK_STATS
|
|
lwip_stats.link.memerr++;
|
|
lwip_stats.link.proterr++;
|
|
#endif /* LINK_STATS */
|
|
return PPPERR_ALLOC;
|
|
}
|
|
|
|
tailMB = headMB;
|
|
|
|
/* If the link has been idle, we'll send a fresh flag character to
|
|
* flush any noise. */
|
|
if ((sys_jiffies() - pc->lastXMit) >= PPP_MAXIDLEFLAG)
|
|
tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
|
|
pc->lastXMit = sys_jiffies();
|
|
|
|
/* Load output buffer. */
|
|
while (n-- > 0) {
|
|
c = *s++;
|
|
|
|
/* Update FCS before checking for special characters. */
|
|
fcsOut = PPP_FCS(fcsOut, c);
|
|
|
|
/* Copy to output buffer escaping special characters. */
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
}
|
|
|
|
/* Add FCS and trailing flag. */
|
|
c = ~fcsOut & 0xFF;
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
c = (~fcsOut >> 8) & 0xFF;
|
|
tailMB = pppAppend(c, tailMB, &pc->outACCM);
|
|
tailMB = pppAppend(PPP_FLAG, tailMB, NULL);
|
|
|
|
/* If we failed to complete the packet, throw it away.
|
|
* Otherwise send it. */
|
|
if (!tailMB) {
|
|
PPPDEBUG((LOG_WARNING,
|
|
"pppWrite[%d]: Alloc err - dropping pbuf len=%d\n", pd, headMB->len));
|
|
/* "pppWrite[%d]: Alloc err - dropping %d:%.*H", pd, headMB->len, LWIP_MIN(headMB->len * 2, 40), headMB->payload)); */
|
|
pbuf_free(headMB);
|
|
#if LINK_STATS
|
|
lwip_stats.link.memerr++;
|
|
lwip_stats.link.proterr++;
|
|
#endif /* LINK_STATS */
|
|
return PPPERR_ALLOC;
|
|
}
|
|
|
|
PPPDEBUG((LOG_INFO, "pppWrite[%d]: len=%d\n", pd, headMB->len));
|
|
/* "pppWrite[%d]: %d:%.*H", pd, headMB->len, LWIP_MIN(headMB->len * 2, 40), headMB->payload)); */
|
|
nPut(pc, headMB);
|
|
|
|
return PPPERR_NONE;
|
|
}
|
|
|
|
/*
|
|
* ppp_send_config - configure the transmit characteristics of
|
|
* the ppp interface.
|
|
*/
|
|
void ppp_send_config(
|
|
int unit,
|
|
int mtu,
|
|
u32_t asyncmap,
|
|
int pcomp,
|
|
int accomp
|
|
)
|
|
{
|
|
PPPControl *pc = &pppControl[unit];
|
|
int i;
|
|
|
|
pc->mtu = mtu;
|
|
pc->pcomp = pcomp;
|
|
pc->accomp = accomp;
|
|
|
|
/* Load the ACCM bits for the 32 control codes. */
|
|
for (i = 0; i < 32/8; i++)
|
|
pc->outACCM[i] = (u_char)((asyncmap >> (8 * i)) & 0xFF);
|
|
PPPDEBUG((LOG_INFO, "ppp_send_config[%d]: outACCM=%X %X %X %X\n",
|
|
unit,
|
|
pc->outACCM[0], pc->outACCM[1], pc->outACCM[2], pc->outACCM[3]));
|
|
}
|
|
|
|
|
|
/*
|
|
* ppp_set_xaccm - set the extended transmit ACCM for the interface.
|
|
*/
|
|
void ppp_set_xaccm(int unit, ext_accm *accm)
|
|
{
|
|
memcpy(pppControl[unit].outACCM, accm, sizeof(ext_accm));
|
|
PPPDEBUG((LOG_INFO, "ppp_set_xaccm[%d]: outACCM=%X %X %X %X\n",
|
|
unit,
|
|
pppControl[unit].outACCM[0],
|
|
pppControl[unit].outACCM[1],
|
|
pppControl[unit].outACCM[2],
|
|
pppControl[unit].outACCM[3]));
|
|
}
|
|
|
|
|
|
/*
|
|
* ppp_recv_config - configure the receive-side characteristics of
|
|
* the ppp interface.
|
|
*/
|
|
void ppp_recv_config(
|
|
int unit,
|
|
int mru,
|
|
u32_t asyncmap,
|
|
int pcomp,
|
|
int accomp
|
|
)
|
|
{
|
|
PPPControl *pc = &pppControl[unit];
|
|
int i;
|
|
|
|
(void)accomp;
|
|
(void)pcomp;
|
|
(void)mru;
|
|
|
|
/* Load the ACCM bits for the 32 control codes. */
|
|
for (i = 0; i < 32 / 8; i++)
|
|
pc->inACCM[i] = (u_char)(asyncmap >> (i * 8));
|
|
PPPDEBUG((LOG_INFO, "ppp_recv_config[%d]: inACCM=%X %X %X %X\n",
|
|
unit,
|
|
pc->inACCM[0], pc->inACCM[1], pc->inACCM[2], pc->inACCM[3]));
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* ccp_test - ask kernel whether a given compression method
|
|
* is acceptable for use. Returns 1 if the method and parameters
|
|
* are OK, 0 if the method is known but the parameters are not OK
|
|
* (e.g. code size should be reduced), or -1 if the method is unknown.
|
|
*/
|
|
int ccp_test(
|
|
int unit,
|
|
int opt_len,
|
|
int for_transmit,
|
|
u_char *opt_ptr
|
|
)
|
|
{
|
|
return 0; /* XXX Currently no compression. */
|
|
}
|
|
|
|
/*
|
|
* ccp_flags_set - inform kernel about the current state of CCP.
|
|
*/
|
|
void ccp_flags_set(int unit, int isopen, int isup)
|
|
{
|
|
/* XXX */
|
|
}
|
|
|
|
/*
|
|
* ccp_fatal_error - returns 1 if decompression was disabled as a
|
|
* result of an error detected after decompression of a packet,
|
|
* 0 otherwise. This is necessary because of patent nonsense.
|
|
*/
|
|
int ccp_fatal_error(int unit)
|
|
{
|
|
/* XXX */
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* get_idle_time - return how long the link has been idle.
|
|
*/
|
|
int get_idle_time(int u, struct ppp_idle *ip)
|
|
{
|
|
/* XXX */
|
|
(void)u;
|
|
(void)ip;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Return user specified netmask, modified by any mask we might determine
|
|
* for address `addr' (in network byte order).
|
|
* Here we scan through the system's list of interfaces, looking for
|
|
* any non-point-to-point interfaces which might appear to be on the same
|
|
* network as `addr'. If we find any, we OR in their netmask to the
|
|
* user-specified netmask.
|
|
*/
|
|
u32_t GetMask(u32_t addr)
|
|
{
|
|
u32_t mask, nmask;
|
|
|
|
htonl(addr);
|
|
if (IN_CLASSA(addr)) /* determine network mask for address class */
|
|
nmask = IN_CLASSA_NET;
|
|
else if (IN_CLASSB(addr))
|
|
nmask = IN_CLASSB_NET;
|
|
else
|
|
nmask = IN_CLASSC_NET;
|
|
/* class D nets are disallowed by bad_ip_adrs */
|
|
mask = subnetMask | htonl(nmask);
|
|
|
|
/* XXX
|
|
* Scan through the system's network interfaces.
|
|
* Get each netmask and OR them into our mask.
|
|
*/
|
|
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* sifvjcomp - config tcp header compression
|
|
*/
|
|
int sifvjcomp(
|
|
int pd,
|
|
int vjcomp,
|
|
int cidcomp,
|
|
int maxcid
|
|
)
|
|
{
|
|
#if VJ_SUPPORT > 0
|
|
PPPControl *pc = &pppControl[pd];
|
|
|
|
pc->vjEnabled = vjcomp;
|
|
pc->vjComp.compressSlot = cidcomp;
|
|
pc->vjComp.maxSlotIndex = maxcid;
|
|
PPPDEBUG((LOG_INFO, "sifvjcomp: VJ compress enable=%d slot=%d max slot=%d\n",
|
|
vjcomp, cidcomp, maxcid));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* pppifNetifInit - netif init callback
|
|
*/
|
|
static err_t pppifNetifInit(struct netif *netif)
|
|
{
|
|
netif->name[0] = 'p';
|
|
netif->name[1] = 'p';
|
|
netif->output = pppifOutput;
|
|
netif->mtu = pppMTU((int)netif->state);
|
|
return ERR_OK;
|
|
}
|
|
|
|
|
|
/*
|
|
* sifup - Config the interface up and enable IP packets to pass.
|
|
*/
|
|
int sifup(int pd)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 1;
|
|
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
|
|
st = 0;
|
|
PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parms\n", pd));
|
|
} else {
|
|
netif_remove(&pc->netif);
|
|
if (netif_add(&pc->netif, &pc->addrs.our_ipaddr, &pc->addrs.netmask, &pc->addrs.his_ipaddr, (void *)pd, pppifNetifInit, ip_input)) {
|
|
|
|
netif_set_up(&pc->netif);
|
|
pc->if_up = 1;
|
|
pc->errCode = PPPERR_NONE;
|
|
|
|
PPPDEBUG((LOG_DEBUG, "sifup: unit %d: linkStatusCB=%lx errCode=%d\n", pd, pc->linkStatusCB, pc->errCode));
|
|
if(pc->linkStatusCB)
|
|
pc->linkStatusCB(pc->linkStatusCtx, pc->errCode, &pc->addrs);
|
|
} else {
|
|
st = 0;
|
|
PPPDEBUG((LOG_ERR, "sifup[%d]: netif_add failed\n", pd));
|
|
}
|
|
}
|
|
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* sifnpmode - Set the mode for handling packets for a given NP.
|
|
*/
|
|
int sifnpmode(int u, int proto, enum NPmode mode)
|
|
{
|
|
(void)u;
|
|
(void)proto;
|
|
(void)mode;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* sifdown - Config the interface down and disable IP.
|
|
*/
|
|
int sifdown(int pd)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 1;
|
|
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
|
|
st = 0;
|
|
PPPDEBUG((LOG_WARNING, "sifdown[%d]: bad parms\n", pd));
|
|
} else {
|
|
pc->if_up = 0;
|
|
netif_remove(&pc->netif);
|
|
PPPDEBUG((LOG_DEBUG, "sifdown: unit %d: linkStatusCB=%lx errCode=%d\n", pd, pc->linkStatusCB, pc->errCode));
|
|
if(pc->linkStatusCB)
|
|
pc->linkStatusCB(pc->linkStatusCtx, PPPERR_CONNECT, NULL);
|
|
}
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* sifaddr - Config the interface IP addresses and netmask.
|
|
*/
|
|
int sifaddr(
|
|
int pd, /* Interface unit ??? */
|
|
u32_t o, /* Our IP address ??? */
|
|
u32_t h, /* His IP address ??? */
|
|
u32_t m, /* IP subnet mask ??? */
|
|
u32_t ns1, /* Primary DNS */
|
|
u32_t ns2 /* Secondary DNS */
|
|
)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 1;
|
|
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
|
|
st = 0;
|
|
PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parms\n", pd));
|
|
} else {
|
|
memcpy(&pc->addrs.our_ipaddr, &o, sizeof(o));
|
|
memcpy(&pc->addrs.his_ipaddr, &h, sizeof(h));
|
|
memcpy(&pc->addrs.netmask, &m, sizeof(m));
|
|
memcpy(&pc->addrs.dns1, &ns1, sizeof(ns1));
|
|
memcpy(&pc->addrs.dns2, &ns2, sizeof(ns2));
|
|
}
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* cifaddr - Clear the interface IP addresses, and delete routes
|
|
* through the interface if possible.
|
|
*/
|
|
int cifaddr(
|
|
int pd, /* Interface unit ??? */
|
|
u32_t o, /* Our IP address ??? */
|
|
u32_t h /* IP broadcast address ??? */
|
|
)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 1;
|
|
|
|
(void)o;
|
|
(void)h;
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
|
|
st = 0;
|
|
PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parms\n", pd));
|
|
} else {
|
|
IP4_ADDR(&pc->addrs.our_ipaddr, 0,0,0,0);
|
|
IP4_ADDR(&pc->addrs.his_ipaddr, 0,0,0,0);
|
|
IP4_ADDR(&pc->addrs.netmask, 255,255,255,0);
|
|
IP4_ADDR(&pc->addrs.dns1, 0,0,0,0);
|
|
IP4_ADDR(&pc->addrs.dns2, 0,0,0,0);
|
|
}
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* sifdefaultroute - assign a default route through the address given.
|
|
*/
|
|
int sifdefaultroute(int pd, u32_t l, u32_t g)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 1;
|
|
|
|
(void)l;
|
|
(void)g;
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
|
|
st = 0;
|
|
PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parms\n", pd));
|
|
} else {
|
|
netif_set_default(&pc->netif);
|
|
}
|
|
|
|
/* TODO: check how PPP handled the netMask, previously not set by ipSetDefault */
|
|
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* cifdefaultroute - delete a default route through the address given.
|
|
*/
|
|
int cifdefaultroute(int pd, u32_t l, u32_t g)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
int st = 1;
|
|
|
|
(void)l;
|
|
(void)g;
|
|
if (pd < 0 || pd >= NUM_PPP || !pc->openFlag) {
|
|
st = 0;
|
|
PPPDEBUG((LOG_WARNING, "sifup[%d]: bad parms\n", pd));
|
|
} else {
|
|
netif_set_default(NULL);
|
|
}
|
|
|
|
return st;
|
|
}
|
|
|
|
void
|
|
pppMainWakeup(int pd)
|
|
{
|
|
PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d\n", pd));
|
|
sio_read_abort(pppControl[pd].fd);
|
|
}
|
|
|
|
/* these callbacks are necessary because lcp_* functions
|
|
must be called in the same context as pppInput(),
|
|
namely the tcpip_thread(), essentially because
|
|
they manipulate timeouts which are thread-private
|
|
*/
|
|
|
|
static void
|
|
pppStartCB(void *arg)
|
|
{
|
|
int pd = (int)arg;
|
|
|
|
PPPDEBUG((LOG_DEBUG, "pppStartCB: unit %d\n", pd));
|
|
lcp_lowerup(pd);
|
|
lcp_open(pd); /* Start protocol */
|
|
}
|
|
|
|
static void
|
|
pppStopCB(void *arg)
|
|
{
|
|
int pd = (int)arg;
|
|
|
|
PPPDEBUG((LOG_DEBUG, "pppStopCB: unit %d\n", pd));
|
|
lcp_close(pd, "User request");
|
|
}
|
|
|
|
static void
|
|
pppHupCB(void *arg)
|
|
{
|
|
int pd = (int)arg;
|
|
|
|
PPPDEBUG((LOG_DEBUG, "pppHupCB: unit %d\n", pd));
|
|
lcp_lowerdown(pd);
|
|
link_terminated(pd);
|
|
}
|
|
/**********************************/
|
|
/*** LOCAL FUNCTION DEFINITIONS ***/
|
|
/**********************************/
|
|
/* The main PPP process function. This implements the state machine according
|
|
* to section 4 of RFC 1661: The Point-To-Point Protocol. */
|
|
static void pppMain(void *arg)
|
|
{
|
|
int pd = (int)arg;
|
|
struct pbuf *p;
|
|
PPPControl* pc;
|
|
|
|
pc = &pppControl[pd];
|
|
|
|
p = pbuf_alloc(PBUF_RAW, PPP_MRU+PPP_HDRLEN, PBUF_RAM);
|
|
if(!p) {
|
|
LWIP_ASSERT("p != NULL", p);
|
|
pc->errCode = PPPERR_ALLOC;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Start the connection and handle incoming events (packet or timeout).
|
|
*/
|
|
PPPDEBUG((LOG_INFO, "pppMain: unit %d: Connecting\n", pd));
|
|
tcpip_callback(pppStartCB, arg);
|
|
while (lcp_phase[pd] != PHASE_DEAD) {
|
|
if (pc->kill_link) {
|
|
PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d kill_link -> pppStopCB\n", pd));
|
|
pc->errCode = PPPERR_USER;
|
|
/* This will leave us at PHASE_DEAD. */
|
|
tcpip_callback(pppStopCB, arg);
|
|
pc->kill_link = 0;
|
|
}
|
|
else if (pc->sig_hup) {
|
|
PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d sig_hup -> pppHupCB\n", pd));
|
|
pc->sig_hup = 0;
|
|
tcpip_callback(pppHupCB, arg);
|
|
} else {
|
|
int c = sio_read(pc->fd, p->payload, p->len);
|
|
if(c > 0) {
|
|
pppInProc(pd, p->payload, c);
|
|
} else {
|
|
PPPDEBUG((LOG_DEBUG, "pppMainWakeup: unit %d sio_read len=%d returned %d\n", pd, p->len, c));
|
|
sys_msleep(1); /* give other tasks a chance to run */
|
|
}
|
|
}
|
|
}
|
|
PPPDEBUG((LOG_INFO, "pppMain: unit %d: PHASE_DEAD\n", pd));
|
|
pbuf_free(p);
|
|
|
|
out:
|
|
PPPDEBUG((LOG_DEBUG, "pppMain: unit %d: linkStatusCB=%lx errCode=%d\n", pd, pc->linkStatusCB, pc->errCode));
|
|
if(pc->linkStatusCB)
|
|
pc->linkStatusCB(pc->linkStatusCtx, pc->errCode ? pc->errCode : PPPERR_PROTOCOL, NULL);
|
|
|
|
pc->openFlag = 0;
|
|
}
|
|
|
|
static struct pbuf *pppSingleBuf(struct pbuf *p)
|
|
{
|
|
struct pbuf *q, *b;
|
|
u_char *pl;
|
|
|
|
if(p->tot_len == p->len)
|
|
return p;
|
|
|
|
q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
|
|
if(!q) {
|
|
PPPDEBUG((LOG_ERR,
|
|
"pppSingleBuf: unable to alloc new buf (%d)\n", p->tot_len));
|
|
return p; /* live dangerously */
|
|
}
|
|
|
|
for(b = p, pl = q->payload; b != NULL; b = b->next) {
|
|
memcpy(pl, b->payload, b->len);
|
|
pl += b->len;
|
|
}
|
|
|
|
pbuf_free(p);
|
|
|
|
return q;
|
|
}
|
|
|
|
struct pppInputHeader {
|
|
int unit;
|
|
u16_t proto;
|
|
};
|
|
|
|
/*
|
|
* Pass the processed input packet to the appropriate handler.
|
|
* This function and all handlers run in the context of the tcpip_thread
|
|
*/
|
|
static void pppInput(void *arg)
|
|
{
|
|
struct pbuf *nb = (struct pbuf *)arg;
|
|
u16_t protocol;
|
|
int pd;
|
|
|
|
pd = ((struct pppInputHeader *)nb->payload)->unit;
|
|
protocol = ((struct pppInputHeader *)nb->payload)->proto;
|
|
|
|
pbuf_header(nb, -(int)sizeof(struct pppInputHeader));
|
|
|
|
#if LINK_STATS
|
|
lwip_stats.link.recv++;
|
|
#endif /* LINK_STATS */
|
|
|
|
/*
|
|
* Toss all non-LCP packets unless LCP is OPEN.
|
|
* Until we get past the authentication phase, toss all packets
|
|
* except LCP, LQR and authentication packets.
|
|
*/
|
|
if((lcp_phase[pd] <= PHASE_AUTHENTICATE) && (protocol != PPP_LCP)) {
|
|
if(!((protocol == PPP_LQR) || (protocol == PPP_PAP) || (protocol == PPP_CHAP)) ||
|
|
(lcp_phase[pd] != PHASE_AUTHENTICATE)) {
|
|
PPPDEBUG((LOG_INFO, "pppInput: discarding proto 0x%04X in phase %d\n", protocol, lcp_phase[pd]));
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
switch(protocol) {
|
|
case PPP_VJC_COMP: /* VJ compressed TCP */
|
|
#if VJ_SUPPORT > 0
|
|
PPPDEBUG((LOG_INFO, "pppInput[%d]: vj_comp in pbuf len=%d\n", pd, nb->len));
|
|
/*
|
|
* Clip off the VJ header and prepend the rebuilt TCP/IP header and
|
|
* pass the result to IP.
|
|
*/
|
|
if (vj_uncompress_tcp(&nb, &pppControl[pd].vjComp) >= 0) {
|
|
if (pppControl[pd].netif.input != NULL) {
|
|
pppControl[pd].netif.input(nb, &pppControl[pd].netif);
|
|
}
|
|
return;
|
|
}
|
|
/* Something's wrong so drop it. */
|
|
PPPDEBUG((LOG_WARNING, "pppInput[%d]: Dropping VJ compressed\n", pd));
|
|
#else
|
|
/* No handler for this protocol so drop the packet. */
|
|
PPPDEBUG((LOG_INFO, "pppInput[%d]: drop VJ Comp in %d:%s\n", pd, nb->len, nb->payload));
|
|
#endif /* VJ_SUPPORT > 0 */
|
|
break;
|
|
case PPP_VJC_UNCOMP: /* VJ uncompressed TCP */
|
|
#if VJ_SUPPORT > 0
|
|
PPPDEBUG((LOG_INFO, "pppInput[%d]: vj_un in pbuf len=%d\n", pd, nb->len));
|
|
/*
|
|
* Process the TCP/IP header for VJ header compression and then pass
|
|
* the packet to IP.
|
|
*/
|
|
if (vj_uncompress_uncomp(nb, &pppControl[pd].vjComp) >= 0) {
|
|
if (pppControl[pd].netif.input != NULL) {
|
|
pppControl[pd].netif.input(nb, &pppControl[pd].netif);
|
|
}
|
|
return;
|
|
}
|
|
/* Something's wrong so drop it. */
|
|
PPPDEBUG((LOG_WARNING, "pppInput[%d]: Dropping VJ uncompressed\n", pd));
|
|
#else
|
|
/* No handler for this protocol so drop the packet. */
|
|
PPPDEBUG((LOG_INFO,
|
|
"pppInput[%d]: drop VJ UnComp in %d:.*H\n",
|
|
pd, nb->len, LWIP_MIN(nb->len * 2, 40), nb->payload));
|
|
#endif /* VJ_SUPPORT > 0 */
|
|
break;
|
|
case PPP_IP: /* Internet Protocol */
|
|
PPPDEBUG((LOG_INFO, "pppInput[%d]: ip in pbuf len=%d\n", pd, nb->len));
|
|
if (pppControl[pd].netif.input != NULL) {
|
|
pppControl[pd].netif.input(nb, &pppControl[pd].netif);
|
|
}
|
|
return;
|
|
default:
|
|
{
|
|
struct protent *protp;
|
|
int i;
|
|
|
|
/*
|
|
* Upcall the proper protocol input routine.
|
|
*/
|
|
for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
|
|
if (protp->protocol == protocol && protp->enabled_flag) {
|
|
PPPDEBUG((LOG_INFO, "pppInput[%d]: %s len=%d\n", pd, protp->name, nb->len));
|
|
nb = pppSingleBuf(nb);
|
|
(*protp->input)(pd, nb->payload, nb->len);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* No handler for this protocol so reject the packet. */
|
|
PPPDEBUG((LOG_INFO, "pppInput[%d]: rejecting unsupported proto 0x%04X len=%d\n", pd, protocol, nb->len));
|
|
pbuf_header(nb, sizeof(protocol));
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
protocol = htons(protocol);
|
|
memcpy(nb->payload, &protocol, sizeof(protocol));
|
|
#endif
|
|
lcp_sprotrej(pd, nb->payload, nb->len);
|
|
}
|
|
break;
|
|
}
|
|
|
|
drop:
|
|
#if LINK_STATS
|
|
lwip_stats.link.drop++;
|
|
#endif
|
|
|
|
out:
|
|
pbuf_free(nb);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Drop the input packet.
|
|
*/
|
|
static void pppDrop(PPPControl *pc)
|
|
{
|
|
if (pc->inHead != NULL) {
|
|
#if 0
|
|
PPPDEBUG((LOG_INFO, "pppDrop: %d:%.*H\n", pc->inHead->len, min(60, pc->inHead->len * 2), pc->inHead->payload));
|
|
#endif
|
|
PPPDEBUG((LOG_INFO, "pppDrop: pbuf len=%d\n", pc->inHead->len));
|
|
if (pc->inTail && (pc->inTail != pc->inHead))
|
|
pbuf_free(pc->inTail);
|
|
pbuf_free(pc->inHead);
|
|
pc->inHead = NULL;
|
|
pc->inTail = NULL;
|
|
}
|
|
#if VJ_SUPPORT > 0
|
|
vj_uncompress_err(&pc->vjComp);
|
|
#endif
|
|
|
|
#if LINK_STATS
|
|
lwip_stats.link.drop++;
|
|
#endif /* LINK_STATS */
|
|
}
|
|
|
|
|
|
/*
|
|
* Process a received octet string.
|
|
*/
|
|
static void pppInProc(int pd, u_char *s, int l)
|
|
{
|
|
PPPControl *pc = &pppControl[pd];
|
|
struct pbuf *nextNBuf;
|
|
u_char curChar;
|
|
|
|
PPPDEBUG((LOG_DEBUG, "pppInProc[%d]: got %d bytes\n", pd, l));
|
|
while (l-- > 0) {
|
|
curChar = *s++;
|
|
|
|
/* Handle special characters. */
|
|
if (ESCAPE_P(pc->inACCM, curChar)) {
|
|
/* Check for escape sequences. */
|
|
/* XXX Note that this does not handle an escaped 0x5d character which
|
|
* would appear as an escape character. Since this is an ASCII ']'
|
|
* and there is no reason that I know of to escape it, I won't complicate
|
|
* the code to handle this case. GLL */
|
|
if (curChar == PPP_ESCAPE)
|
|
pc->inEscaped = 1;
|
|
/* Check for the flag character. */
|
|
else if (curChar == PPP_FLAG) {
|
|
/* If this is just an extra flag character, ignore it. */
|
|
if (pc->inState <= PDADDRESS)
|
|
;
|
|
/* If we haven't received the packet header, drop what has come in. */
|
|
else if (pc->inState < PDDATA) {
|
|
PPPDEBUG((LOG_WARNING,
|
|
"pppInProc[%d]: Dropping incomplete packet %d\n",
|
|
pd, pc->inState));
|
|
#if LINK_STATS
|
|
lwip_stats.link.lenerr++;
|
|
#endif
|
|
pppDrop(pc);
|
|
}
|
|
/* If the fcs is invalid, drop the packet. */
|
|
else if (pc->inFCS != PPP_GOODFCS) {
|
|
PPPDEBUG((LOG_INFO,
|
|
"pppInProc[%d]: Dropping bad fcs 0x%04X proto=0x%04X\n",
|
|
pd, pc->inFCS, pc->inProtocol));
|
|
#if LINK_STATS
|
|
lwip_stats.link.chkerr++;
|
|
#endif
|
|
pppDrop(pc);
|
|
}
|
|
/* Otherwise it's a good packet so pass it on. */
|
|
else {
|
|
|
|
/* Trim off the checksum. */
|
|
if(pc->inTail->len >= 2) {
|
|
pc->inTail->len -= 2;
|
|
|
|
pc->inTail->tot_len = pc->inTail->len;
|
|
if (pc->inTail != pc->inHead) {
|
|
pbuf_cat(pc->inHead, pc->inTail);
|
|
}
|
|
} else {
|
|
pc->inTail->tot_len = pc->inTail->len;
|
|
if (pc->inTail != pc->inHead) {
|
|
pbuf_cat(pc->inHead, pc->inTail);
|
|
}
|
|
|
|
pbuf_realloc(pc->inHead, pc->inHead->tot_len - 2);
|
|
}
|
|
|
|
/* Dispatch the packet thereby consuming it. */
|
|
if(tcpip_callback(pppInput, pc->inHead) != ERR_OK) {
|
|
PPPDEBUG((LOG_ERR,
|
|
"pppInProc[%d]: tcpip_callback() failed, dropping packet\n", pd));
|
|
pbuf_free(pc->inHead);
|
|
#if LINK_STATS
|
|
lwip_stats.link.drop++;
|
|
#endif
|
|
}
|
|
pc->inHead = NULL;
|
|
pc->inTail = NULL;
|
|
}
|
|
|
|
/* Prepare for a new packet. */
|
|
pc->inFCS = PPP_INITFCS;
|
|
pc->inState = PDADDRESS;
|
|
pc->inEscaped = 0;
|
|
}
|
|
/* Other characters are usually control characters that may have
|
|
* been inserted by the physical layer so here we just drop them. */
|
|
else {
|
|
PPPDEBUG((LOG_WARNING,
|
|
"pppInProc[%d]: Dropping ACCM char <%d>\n", pd, curChar));
|
|
}
|
|
}
|
|
/* Process other characters. */
|
|
else {
|
|
/* Unencode escaped characters. */
|
|
if (pc->inEscaped) {
|
|
pc->inEscaped = 0;
|
|
curChar ^= PPP_TRANS;
|
|
}
|
|
|
|
/* Process character relative to current state. */
|
|
switch(pc->inState) {
|
|
case PDIDLE: /* Idle state - waiting. */
|
|
/* Drop the character if it's not 0xff
|
|
* we would have processed a flag character above. */
|
|
if (curChar != PPP_ALLSTATIONS) {
|
|
break;
|
|
}
|
|
|
|
/* Fall through */
|
|
case PDSTART: /* Process start flag. */
|
|
/* Prepare for a new packet. */
|
|
pc->inFCS = PPP_INITFCS;
|
|
|
|
/* Fall through */
|
|
case PDADDRESS: /* Process address field. */
|
|
if (curChar == PPP_ALLSTATIONS) {
|
|
pc->inState = PDCONTROL;
|
|
break;
|
|
}
|
|
/* Else assume compressed address and control fields so
|
|
* fall through to get the protocol... */
|
|
case PDCONTROL: /* Process control field. */
|
|
/* If we don't get a valid control code, restart. */
|
|
if (curChar == PPP_UI) {
|
|
pc->inState = PDPROTOCOL1;
|
|
break;
|
|
}
|
|
#if 0
|
|
else {
|
|
PPPDEBUG((LOG_WARNING,
|
|
"pppInProc[%d]: Invalid control <%d>\n", pd, curChar));
|
|
pc->inState = PDSTART;
|
|
}
|
|
#endif
|
|
case PDPROTOCOL1: /* Process protocol field 1. */
|
|
/* If the lower bit is set, this is the end of the protocol
|
|
* field. */
|
|
if (curChar & 1) {
|
|
pc->inProtocol = curChar;
|
|
pc->inState = PDDATA;
|
|
}
|
|
else {
|
|
pc->inProtocol = (u_int)curChar << 8;
|
|
pc->inState = PDPROTOCOL2;
|
|
}
|
|
break;
|
|
case PDPROTOCOL2: /* Process protocol field 2. */
|
|
pc->inProtocol |= curChar;
|
|
pc->inState = PDDATA;
|
|
break;
|
|
case PDDATA: /* Process data byte. */
|
|
/* Make space to receive processed data. */
|
|
if (pc->inTail == NULL || pc->inTail->len == PBUF_POOL_BUFSIZE) {
|
|
if(pc->inTail) {
|
|
pc->inTail->tot_len = pc->inTail->len;
|
|
if (pc->inTail != pc->inHead) {
|
|
pbuf_cat(pc->inHead, pc->inTail);
|
|
}
|
|
}
|
|
/* If we haven't started a packet, we need a packet header. */
|
|
nextNBuf = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL);
|
|
if (nextNBuf == NULL) {
|
|
/* No free buffers. Drop the input packet and let the
|
|
* higher layers deal with it. Continue processing
|
|
* the received pbuf chain in case a new packet starts. */
|
|
PPPDEBUG((LOG_ERR, "pppInProc[%d]: NO FREE MBUFS!\n", pd));
|
|
#if LINK_STATS
|
|
lwip_stats.link.memerr++;
|
|
#endif /* LINK_STATS */
|
|
pppDrop(pc);
|
|
pc->inState = PDSTART; /* Wait for flag sequence. */
|
|
break;
|
|
}
|
|
if (pc->inHead == NULL) {
|
|
struct pppInputHeader *pih = nextNBuf->payload;
|
|
|
|
pih->unit = pd;
|
|
pih->proto = pc->inProtocol;
|
|
|
|
nextNBuf->len += sizeof(*pih);
|
|
|
|
pc->inHead = nextNBuf;
|
|
}
|
|
pc->inTail = nextNBuf;
|
|
}
|
|
/* Load character into buffer. */
|
|
((u_char*)pc->inTail->payload)[pc->inTail->len++] = curChar;
|
|
break;
|
|
}
|
|
|
|
/* update the frame check sequence number. */
|
|
pc->inFCS = PPP_FCS(pc->inFCS, curChar);
|
|
}
|
|
}
|
|
avRandomize();
|
|
}
|
|
|
|
#endif /* PPP_SUPPORT */
|