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contiki/core/net/ppp.c

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/*
*---------------------------------------------------------------------------
* ppp.c - PPP Processor/Handler -
* -
*---------------------------------------------------------------------------
*
* Version -
* 0.1 Original Version Jun 3, 2000 -
* -
*---------------------------------------------------------------------------
*/
/*
* 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: ppp.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
*
*/
/* */
/* include files */
/* */
#include "lcp.h"
#include "pap.h"
#include "ipcp.h"
/*#include "time.h"*/
/*#include "mip.h"*/
#if 0
#define DEBUG1(x)
#else
#include <stdio.h>
#define DEBUG1(x) debug_printf x
#endif
/*
Set the debug message level
*/
#define PACKET_RX_DEBUG 1
/*
Include stuff
*/
/*#include "mTypes.h"*/
#include "ppp.h"
#include "ahdlc.h"
#include "ipcp.h"
#include "lcp.h"
extern int ppp_arch_getchar(u8_t *p);
/*
Buffers that this layer needs (this can be optimized out)
*/
u8_t ppp_rx_buffer[PPP_RX_BUFFER_SIZE];
/*u8_t ppp_tx_buffer[PPP_TX_BUFFER_SIZE];*/
/*
* Other state storage (this can be placed in a struct and this could could
* support multiple PPP connections, would have to embedded the other ppp
* module state also)
*/
u8_t ppp_flags;
u8_t ppp_id;
u8_t ppp_retry;
#if PACKET_RX_DEBUG
u16_t ppp_rx_frame_count=0;
u16_t ppp_rx_tobig_error;
u8_t done; /* temporary variable */
#endif
/*---------------------------------------------------------------------------*/
static u8_t
check_ppp_errors(void)
{
u8_t ret = 0;
/* Check Errors */
if(lcp_state & LCP_TX_TIMEOUT) {
ret = 1;
}
if(lcp_state & LCP_RX_TIMEOUT) {
ret = 2;
}
if(pap_state & PAP_TX_AUTH_FAIL) {
ret = 3;
}
if(pap_state & PAP_RX_AUTH_FAIL) {
ret = 4;
}
if(pap_state & PAP_TX_TIMEOUT) {
ret = 5;
}
if(pap_state & PAP_RX_TIMEOUT) {
ret = 6;
}
if(ipcp_state & IPCP_TX_TIMEOUT) {
ret = 7;
}
return ret;
}
/*---------------------------------------------------------------------------*/
/*
* Unknown Protocol Handler, sends reject
*/
static void
ppp_reject_protocol(u16_t protocol, u8_t *buffer, u16_t count)
{
u16_t i;
u8_t *dptr, *sptr;
LCPPKT *pkt;
/* first copy rejected packet back, start from end and work forward,
+++ Pay attention to buffer managment when updated. Assumes fixed
PPP blocks. */
DEBUG1(("Rejecting Protocol\n"));
if((count + 6) > PPP_RX_BUFFER_SIZE) {
/* This is a fatal error +++ do somthing about it. */
DEBUG1(("Cannot Reject Protocol, PKT to big\n"));
return;
}
dptr = buffer + count + 6;
sptr = buffer + count;
for(i = 0; i < count; ++i) {
*dptr-- = *sptr--;
}
pkt = (LCPPKT *)buffer;
pkt->code = PROT_REJ; /* Write Conf_rej */
/*pkt->id = tid++;*/ /* write tid */
pkt->len = htons(count + 6);
*((u16_t *)(&pkt->data[0])) = htons(protocol);
ahdlc_tx(LCP, buffer, 0, (u16_t)(count + 6), 0);
}
/*---------------------------------------------------------------------------*/
#if PACKET_RX_DEBUG
void
dump_ppp_packet(u8_t *buffer, u16_t len)
{
int i;
DEBUG1(("\n"));
for(i = 0;i < len; ++i) {
if((i & 0x1f) == 0x10) {
DEBUG1(("\n"));
}
DEBUG1(("0x%02x ",buffer[i]));
}
DEBUG1(("\n\n"));
}
#endif
/*---------------------------------------------------------------------------*/
/* Initialize and start PPP engine. This just sets things up to
* starting values. This can stay a private method.
*/
/*---------------------------------------------------------------------------*/
void
ppp_init()
{
#if PACKET_RX_DEBUG
ppp_rx_frame_count = 0;
done = 0;
#endif
ppp_flags = 0;
pap_init();
ipcp_init();
lcp_init();
ppp_flags = 0;
ahdlc_init(ppp_rx_buffer, PPP_RX_BUFFER_SIZE);
ahdlc_rx_ready();
}
/*---------------------------------------------------------------------------*/
/* raise_ppp() - This routine will try to bring up a PPP connection,
* It is blocking. In the future we probably want to pass a
* structure with all the options on bringing up a PPP link, like
* server/client, DSN server, username password for PAP... +++ for
* now just use config and bit defines
*/
/*---------------------------------------------------------------------------*/
#if 0
u16_t
ppp_raise(u8_t config, u8_t *username, u8_t *password)
{
u16_t status = 0;
/* Initialize PPP engine */
/* init_ppp(); */
pap_init();
ipcp_init();
lcp_init();
/* Enable PPP */
ppp_flags = PPP_RX_READY;
/* Try to bring up the layers */
while(status == 0) {
#ifdef SYSTEM_POLLER
/* If the the serial interrupt is not hooked to ahdlc_rx, or the
system needs to handle other stuff while were blocking, call
the system poller.*/
system_poller();
#endif
/* call the lcp task to bring up the LCP layer */
lcp_task(ppp_tx_buffer);
/* If LCP is up, neg next layer */
if(lcp_state & LCP_TX_UP) {
/* If LCP wants PAP, try to authenticate, else bring up IPCP */
if((lcp_state & LCP_RX_AUTH) && (!(pap_state & PAP_TX_UP))) {
pap_task(ppp_tx_buffer,username,password);
} else {
ipcp_task(ppp_tx_buffer);
}
}
/* If IPCP came up then our link should be up. */
if((ipcp_state & IPCP_TX_UP) && (ipcp_state & IPCP_RX_UP)) {
break;
}
status = check_ppp_errors();
}
return status;
}
#endif
/*---------------------------------------------------------------------------*/
void
ppp_connect(void)
{
/* Initialize PPP engine */
/* init_ppp(); */
pap_init();
ipcp_init();
lcp_init();
/* Enable PPP */
ppp_flags = PPP_RX_READY;
}
/*---------------------------------------------------------------------------*/
void
ppp_send(void)
{
/* If IPCP came up then our link should be up. */
if((ipcp_state & IPCP_TX_UP) && (ipcp_state & IPCP_RX_UP)) {
ahdlc_tx(IPV4, &uip_buf[ UIP_LLH_LEN ], uip_appdata,
UIP_TCPIP_HLEN, uip_len - UIP_TCPIP_HLEN);
}
}
/*---------------------------------------------------------------------------*/
void
ppp_poll(void)
{
u8_t c;
uip_len = 0;
if(!(ppp_flags & PPP_RX_READY)) {
return;
}
while(uip_len == 0 && ppp_arch_getchar(&c)) {
ahdlc_rx(c);
}
/* If IPCP came up then our link should be up. */
if((ipcp_state & IPCP_TX_UP) && (ipcp_state & IPCP_RX_UP)) {
return;
}
/* call the lcp task to bring up the LCP layer */
lcp_task( &uip_buf[ UIP_LLH_LEN ]);
/* If LCP is up, neg next layer */
if((lcp_state & LCP_TX_UP) && (lcp_state & LCP_RX_UP)) {
/* If LCP wants PAP, try to authenticate, else bring up IPCP */
if((lcp_state & LCP_RX_AUTH) && (!(pap_state & PAP_TX_UP))) {
pap_task( &uip_buf[ UIP_LLH_LEN ]);
} else {
ipcp_task( &uip_buf[ UIP_LLH_LEN ]);
}
}
}
/*---------------------------------------------------------------------------*/
/* ppp_upcall() - this is where valid PPP frames from the ahdlc layer are
* sent to be processed and demuxed.
*/
/*---------------------------------------------------------------------------*/
void
ppp_upcall(u16_t protocol, u8_t *buffer, u16_t len)
{
#if PACKET_RX_DEBUG
++ppp_rx_frame_count;
dump_ppp_packet(buffer, len);
if(ppp_rx_frame_count > 18) {
done = 1;
}
#endif
/* check to see if we have a packet waiting to be processed */
if(ppp_flags & PPP_RX_READY) {
/* demux on protocol field */
switch(protocol) {
case LCP: /* We must support some level of LCP */
DEBUG1(("LCP Packet - "));
lcp_rx(buffer, len);
DEBUG1(("\n"));
break;
case PAP: /* PAP should be compile in optional */
DEBUG1(("PAP Packet - "));
pap_rx(buffer, len);
DEBUG1(("\n"));
break;
case IPCP: /* IPCP should be compile in optional. */
DEBUG1(("IPCP Packet - "));
ipcp_rx(buffer, len);
DEBUG1(("\n"));
break;
case IPV4: /* We must support IPV4 */
DEBUG1(("IPV4 Packet---\n"));
memcpy( &uip_buf[ UIP_LLH_LEN ], buffer, len);
uip_len = len;
DEBUG1(("\n"));
break;
default:
DEBUG1(("Unknown PPP Packet Type 0x%04x - ",protocol));
ppp_reject_protocol(protocol, buffer, len);
DEBUG1(("\n"));
break;
}
}
}
/*---------------------------------------------------------------------------*/
/* scan_packet(list,buffer,len)
*
* list = list of supported ID's
* *buffer pointer to the first code in the packet
* length of the codespace
*/
u16_t
scan_packet(u16_t protocol, u8_t *list, u8_t *buffer, u8_t *options, u16_t len)
{
u8_t *tlist, *bptr;
u8_t *tptr;
u8_t bad = 0;
u8_t i, j, good;
bptr = tptr = options;
/* scan through the packet and see if it has any unsupported codes */
while(bptr < options + len) {
/* get code and see if it matches somwhere in the list, if not
we don't support it */
i = *bptr++;
/* DEBUG2("%x - ",i);*/
tlist = list;
good = 0;
while(*tlist) {
/* DEBUG2("%x ",*tlist);*/
if(i == *tlist++) {
good = 1;
break;
}
}
if(!good) {
/* we don't understand it, write it back */
DEBUG1(("We don't understand option 0x%02x\n",i));
bad = 1;
*tptr++ = i;
j = *tptr++ = *bptr++;
for(i = 0; i < j - 2; ++i) {
*tptr++ = *bptr++;
}
} else {
/* advance over to next option */
bptr += *bptr - 1;
}
}
/* Bad? if we we need to send a config Reject */
if(bad) {
/* write the config Rej packet we've built above, take on the header */
bptr = buffer;
*bptr++ = CONF_REJ; /* Write Conf_rej */
bptr++; /* skip over ID */
*bptr++ = 0;
*bptr = tptr - buffer;
/* length right here? */
/* write the reject frame */
DEBUG1(("Writing Reject frame --\n"));
ahdlc_tx(protocol, buffer, 0, (u16_t)(tptr - buffer), 0);
DEBUG1(("\nEnd writing reject \n"));
}
return bad;
}
/*---------------------------------------------------------------------------*/
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