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contiki/core/net/ppp/lcp.c

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/* www.mycal.com
*---------------------------------------------------------------------------
*lcp.c - Link Configuration Protocol Handler. - -
*---------------------------------------------------------------------------
*Version - 0.1 Original Version June 3, 2000 -
*
*---------------------------------------------------------------------------
*- Copyright (C) 2000, Mycal Labs www.mycal.com - -
*---------------------------------------------------------------------------
*
*
*/
/*
* Copyright (c) 2003, Mike Johnson, Mycal Labs, www.mycal.net
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mike Johnson/Mycal Labs
* www.mycal.net.
* 4. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the Mycal Modified uIP TCP/IP stack.
*
* $Id: lcp.c,v 1.1 2006/06/17 22:48:09 adamdunkels Exp $
*
*/
/* */
/* include files */
/* */
#include "contiki-conf.h"
/*#include "time.h"*/
#include "ppp.h"
#include "ahdlc.h"
#include "lcp.h"
#if 0
#define DEBUG1(x)
#define DEBUG2(x)
#else
#include <stdio.h>
#define DEBUG1(x) debug_printf x
#define DEBUG2(x) debug_printf x
#endif
#define TIMER_expire()
#define TIMER_set()
#define TIMER_timeout(x) 1
static unsigned long prev_lcp_seconds = 0;
/*u8_t tflag;
u8_t *lcp_buffer;
u16_t lcp_tx_time;
u8_t lcp_retry;
u16_t lcp_timeout=5;*/
u8_t lcp_state;
u16_t ppp_tx_mru = 0;
/* We need this when we neg our direction.
u8_t lcp_tx_options; */
/*
* Define the supported paramets for this module here.
*/
u8_t lcplist[] = {
LPC_MAGICNUMBER,
LPC_PFC,
LPC_ACFC,
LPC_AUTH,
LPC_ACCM,
LPC_MRU,
0};
/*---------------------------------------------------------------------------*/
/* lcp_init() - Initialize the LCP engine to startup values */
/*---------------------------------------------------------------------------*/
void
lcp_init(void)
{
lcp_state = 0;
ppp_retry = 0;
TIMER_expire();
}
/*---------------------------------------------------------------------------*/
/* lcp_rx() - Receive an LCP packet and process it.
* This routine receives a LCP packet in buffer of length count.
* Process it here, support for CONF_REQ, CONF_ACK, CONF_NACK, CONF_REJ or
* TERM_REQ.
*/
/*---------------------------------------------------------------------------*/
void
lcp_rx(u8_t *buffer, u16_t count)
{
u8_t *bptr = buffer, *tptr;
u8_t error = 0;
u8_t id;
u16_t len, j;
switch(*bptr++) {
case CONF_REQ: /* config request */
/* parce request and see if we can ACK it */
id = *bptr++;
len = (*bptr++ << 8);
len |= *bptr++;
/*len -= 2;*/
DEBUG1(("received [LCP Config Request id %u\n",id));
if(scan_packet((u16_t)LCP, lcplist, buffer, bptr, (u16_t)(len-4))) {
/* must do the -4 here, !scan packet */
DEBUG1((" options were rejected\n"));
} else {
/* lets try to implement what peer wants */
tptr = bptr = buffer;
bptr += 4; /* skip code, id, len */
error = 0;
/* first scan for unknown values */
while(bptr < buffer+len) {
switch(*bptr++) {
case LPC_MRU: /* mru */
j = *bptr++;
j -= 2;
if(j == 2) {
ppp_tx_mru = ((int)*bptr++) << 8;
ppp_tx_mru |= *bptr++;
DEBUG1(("<mru %d> ",ppp_tx_mru));
} else {
DEBUG1(("<mru ??> "));
}
break;
case LPC_ACCM: /* */
bptr++; /* skip length */
j = *bptr++;
j += *bptr++;
j += *bptr++;
j += *bptr++;
if(j==0) {
// ok
DEBUG1(("<asyncmap sum=0x%04x>",j));
//ahdlc_flags |= PPP_TX_ASYNC_MAP;
} else if(j!=0) {
// ok
DEBUG1(("<asyncmap sum=0x%04x>, assume 0xffffffff",j));
} else {
/*
* fail we only support default or all zeros
*/
DEBUG1(("We only support default or all zeros for ACCM "));
error = 1;
*tptr++ = LPC_ACCM;
*tptr++ = 0x6;
*tptr++ = 0;
*tptr++ = 0;
*tptr++ = 0;
*tptr++ = 0;
}
break;
case LPC_AUTH:
bptr++;
if((*bptr++ == 0xc0) && (*bptr++ == 0x23)) {
/* negotiate PAP */
if (strlen(pap_username) > 0) {
DEBUG1(("<auth pap> "));
lcp_state |= LCP_RX_AUTH;
} else {
DEBUG1(("<rej auth pap> "));
*tptr++ = CONF_REJ;
*tptr++; // Keep ID
*tptr++ = 0;
*tptr++ = 8;
*tptr++ = LPC_AUTH;
*tptr++ = 0x4;
*tptr++ = 0xc0;
*tptr++ = 0x23;
ahdlc_tx(LCP, 0, buffer, 0, (u16_t)(tptr-buffer));
return;
}
} else {
/* we only support PAP */
DEBUG1(("<auth ??>"));
error = 1;
*tptr++ = LPC_AUTH;
*tptr++ = 0x4;
*tptr++ = 0xc0;
*tptr++ = 0x23;
}
break;
case LPC_MAGICNUMBER:
DEBUG1(("<magic > "));
/*
* Compair incoming number to our number (not implemented)
*/
bptr++; /* for now just dump */
bptr++;
bptr++;
bptr++;
bptr++;
break;
case LPC_PFC:
bptr++;
DEBUG1(("<pcomp> "));
/*tflag|=PPP_PFC;*/
break;
case LPC_ACFC:
bptr++;
DEBUG1(("<accomp> "));
/*tflag|=PPP_ACFC;*/
break;
}
}
/* Error? if we we need to send a config Reject ++++ this is good for a subroutine */
if(error) {
/* write the config NAK packet we've built above, take on the header */
bptr = buffer;
*bptr++ = CONF_NAK; /* Write Conf_rej */
*bptr++;/*tptr++;*/ /* skip over ID */
/* Write new length */
*bptr++ = 0;
*bptr = tptr - buffer;
/* write the reject frame */
DEBUG1(("\nWriting NAK frame \n"));
// Send packet ahdlc_txz(procol,header,data,headerlen,datalen);
ahdlc_tx(LCP, 0, buffer, 0, (u16_t)(tptr-buffer));
DEBUG1(("- end NAK Write frame\n"));
} else {
/*
* If we get here then we are OK, lets send an ACK and tell the rest
* of our modules our negotiated config.
*/
DEBUG1(("\nSend ACK!\n"));
bptr = buffer;
*bptr++ = CONF_ACK; /* Write Conf_ACK */
bptr++; /* Skip ID (send same one) */
/*
* Set stuff
*/
/*ppp_flags|=tflag;*/
/* DEBUG2("SET- stuff -- are we up? c=%d dif=%d \n", count, (u16_t)(bptr-buffer)); */
/* write the ACK frame */
DEBUG2(("Writing ACK frame \n"));
/* Send packet ahdlc_txz(procol,header,data,headerlen,datalen); */
ahdlc_tx(LCP, 0, buffer, 0, count /*bptr-buffer*/);
DEBUG2(("- end ACK Write frame\n"));
lcp_state |= LCP_RX_UP;
/* expire the timer to make things happen after a state change */
/*timer_expire();*/
}
}
break;
case CONF_ACK: /* config Ack Anytime we do an ack reset the timer to force send. */
DEBUG1(("LCP-ACK - "));
/* check that ID matches one sent */
if(*bptr++ == ppp_id) {
/* Change state to PPP up. */
DEBUG1((">>>>>>>> good ACK id up! %d\n",ppp_id));
/* copy negotiated values over */
lcp_state |= LCP_TX_UP;
/* expire the timer to make things happen after a state change */
TIMER_expire();
}
else
DEBUG1(("*************++++++++++ bad id %d\n",ppp_id));
break;
case CONF_NAK: /* Config Nack */
DEBUG1(("LCP-CONF NAK\n"));
ppp_id++;
break;
case CONF_REJ: /* Config Reject */
DEBUG1(("LCP-CONF REJ\n"));
ppp_id++;
break;
case TERM_REQ: /* Terminate Request */
DEBUG1(("LCP-TERM-REQ -"));
bptr = buffer;
*bptr++ = TERM_ACK; /* Write TERM_ACK */
/* write the reject frame */
DEBUG1(("Writing TERM_ACK frame \n"));
/* Send packet ahdlc_txz(procol,header,data,headerlen,datalen); */
ahdlc_tx(LCP, 0, buffer, 0, count);
lcp_state &= ~LCP_TX_UP;
lcp_state |= LCP_TERM_PEER;
break;
case TERM_ACK:
DEBUG1(("LCP-TERM ACK\n"));
break;
default:
break;
}
}
void lcp_disconnect(u8_t id) {
u8_t buffer[4];
u8_t *bptr = buffer;
*bptr++ = TERM_REQ;
*bptr++ = id;
*bptr++ = 0;
*bptr++ = 4;
ahdlc_tx(LCP, 0, buffer, 0, bptr - buffer);
}
/*---------------------------------------------------------------------------*/
/* lcp_task(buffer) - This routine see if a lcp request needs to be sent
* out. It uses the passed buffer to form the packet. This formed LCP
* request is what we negotiate for sending options on the link.
*
* Currently we negotiate : Magic Number Only, but this will change.
*/
/*---------------------------------------------------------------------------*/
void
lcp_task(u8_t *buffer)
{
u8_t *bptr;
u16_t t;
LCPPKT *pkt;
/* lcp tx not up and hasn't timed out then lets see if we need to send a request */
if(!(lcp_state & LCP_TX_UP) && !(lcp_state & LCP_TX_TIMEOUT)) {
/* Check if we have a request pending */
/*t=get_seconds()-lcp_tx_time;*/
#if 0
if(1 == TIMER_timeout(LCP_TX_TIMEOUT)) {
#else
if((clock_seconds() - prev_lcp_seconds) > LCP_TIMEOUT) {
prev_lcp_seconds = clock_seconds();
#endif
DEBUG1(("\nSending LCP request packet - "));
/*
* No pending request, lets build one
*/
pkt = (LCPPKT *)buffer;
/* Configure-Request only here, write id */
pkt->code = CONF_REQ;
pkt->id = ppp_id;
bptr = pkt->data;
/* Write options */
/* ACCM */
//if((lcp_tx_options & LCP_OPT_ACCM) & 0) {
*bptr++ = LPC_ACCM;
*bptr++ = 0x6;
*bptr++ = 0xff;
*bptr++ = 0xff;
*bptr++ = 0xff;
*bptr++ = 0xff;
//}
#if 0
/* Write magic number */
DEBUG1(("LPC_MAGICNUMBER -"));
*bptr++ = LPC_MAGICNUMBER;
*bptr++ = 0x6;
/*
*bptr++ = random_rand() & 0xff;
*bptr++ = random_rand() & 0xff;
*bptr++ = random_rand() & 0xff;
*bptr++ = random_rand() & 0xff;
*/
*bptr++ = 0x11;
*bptr++ = 0x11;
*bptr++ = 0x11;
*bptr++ = 0x11;
#endif
#if 0
/*
* Authentication protocol
*/
if((lcp_tx_options & LCP_OPT_AUTH) && 0) {
/*
* If turned on, we only negotiate PAP
*/
*bptr++ = LPC_AUTH;
*bptr++ = 0x4;
*bptr++ = 0xc0;
*bptr++ = 0x23;
}
/*
* PFC
*/
if((lcp_tx_options & LCP_OPT_PFC) && 0) {
/*
* If turned on, we only negotiate PAP
*/
*bptr++ = LPC_PFC;
*bptr++ = 0x2;
}
/*
* ACFC
*/
if((lcp_tx_options & LCP_OPT_ACFC) && 0) {
/*
* If turned on, we only negotiate PAP
*/
*bptr++ = LPC_ACFC;
*bptr++ = 0x2;
}
#endif
/* Write length */
t = bptr - buffer;
pkt->len = htons(t); /* length here - code and ID + */
DEBUG1((" len %d\n",t));
/* Send packet */
/* Send packet ahdlc_txz(procol,header,data,headerlen,datalen); */
ahdlc_tx(LCP, 0, buffer, 0, t);
/* Set timer */
TIMER_set();
/*lcp_tx_time=get_seconds();*/
/* Inc retry */
ppp_retry++;
/*
* Have we timed out?
*/
if(ppp_retry > LCP_RETRY_COUNT) {
lcp_state &= LCP_TX_TIMEOUT;
}
}
}
}
/*---------------------------------------------------------------------------*/
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