2067 lines
56 KiB
C
2067 lines
56 KiB
C
/*****************************************************************************
|
|
* lcp.c - Network Link Control Protocol program file.
|
|
*
|
|
* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
|
|
* portions Copyright (c) 1997 by Global Election Systems Inc.
|
|
*
|
|
* The authors hereby grant permission to use, copy, modify, distribute,
|
|
* and license this software and its documentation for any purpose, provided
|
|
* that existing copyright notices are retained in all copies and that this
|
|
* notice and the following disclaimer are included verbatim in any
|
|
* distributions. No written agreement, license, or royalty fee is required
|
|
* for any of the authorized uses.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
******************************************************************************
|
|
* REVISION HISTORY
|
|
*
|
|
* 03-01-01 Marc Boucher <marc@mbsi.ca>
|
|
* Ported to lwIP.
|
|
* 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
|
|
* Original.
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* lcp.c - PPP Link Control Protocol.
|
|
*
|
|
* Copyright (c) 1989 Carnegie Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by Carnegie Mellon University. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
|
|
#include "lwip/opt.h"
|
|
|
|
#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
|
|
|
|
#include "ppp.h"
|
|
#include "pppdebug.h"
|
|
|
|
#include "fsm.h"
|
|
#include "chap.h"
|
|
#include "magic.h"
|
|
#include "auth.h"
|
|
#include "lcp.h"
|
|
|
|
#include <string.h>
|
|
|
|
#if PPPOE_SUPPORT
|
|
#include "netif/ppp_oe.h"
|
|
#else
|
|
#define PPPOE_MAXMTU PPP_MAXMRU
|
|
#endif
|
|
|
|
#if 0 /* UNUSED */
|
|
/*
|
|
* LCP-related command-line options.
|
|
*/
|
|
int lcp_echo_interval = 0; /* Interval between LCP echo-requests */
|
|
int lcp_echo_fails = 0; /* Tolerance to unanswered echo-requests */
|
|
bool lax_recv = 0; /* accept control chars in asyncmap */
|
|
|
|
static int setescape (char **);
|
|
|
|
static option_t lcp_option_list[] = {
|
|
/* LCP options */
|
|
/* list stripped for simplicity */
|
|
{NULL}
|
|
};
|
|
#endif /* UNUSED */
|
|
|
|
/* options */
|
|
LinkPhase lcp_phase[NUM_PPP]; /* Phase of link session (RFC 1661) */
|
|
static u_int lcp_echo_interval = LCP_ECHOINTERVAL; /* Interval between LCP echo-requests */
|
|
static u_int lcp_echo_fails = LCP_MAXECHOFAILS; /* Tolerance to unanswered echo-requests */
|
|
|
|
/* global vars */
|
|
static fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/
|
|
lcp_options lcp_wantoptions[NUM_PPP]; /* Options that we want to request */
|
|
lcp_options lcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
|
|
lcp_options lcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
|
|
lcp_options lcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
|
|
ext_accm xmit_accm[NUM_PPP]; /* extended transmit ACCM */
|
|
|
|
static u32_t lcp_echos_pending = 0; /* Number of outstanding echo msgs */
|
|
static u32_t lcp_echo_number = 0; /* ID number of next echo frame */
|
|
static u32_t lcp_echo_timer_running = 0; /* TRUE if a timer is running */
|
|
|
|
/* @todo: do we really need such a large buffer? The typical 1500 bytes seem too much. */
|
|
static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
|
|
|
|
/*
|
|
* Callbacks for fsm code. (CI = Configuration Information)
|
|
*/
|
|
static void lcp_resetci (fsm*); /* Reset our CI */
|
|
static int lcp_cilen (fsm*); /* Return length of our CI */
|
|
static void lcp_addci (fsm*, u_char*, int*); /* Add our CI to pkt */
|
|
static int lcp_ackci (fsm*, u_char*, int); /* Peer ack'd our CI */
|
|
static int lcp_nakci (fsm*, u_char*, int); /* Peer nak'd our CI */
|
|
static int lcp_rejci (fsm*, u_char*, int); /* Peer rej'd our CI */
|
|
static int lcp_reqci (fsm*, u_char*, int*, int); /* Rcv peer CI */
|
|
static void lcp_up (fsm*); /* We're UP */
|
|
static void lcp_down (fsm*); /* We're DOWN */
|
|
static void lcp_starting (fsm*); /* We need lower layer up */
|
|
static void lcp_finished (fsm*); /* We need lower layer down */
|
|
static int lcp_extcode (fsm*, int, u_char, u_char*, int);
|
|
static void lcp_rprotrej (fsm*, u_char*, int);
|
|
|
|
/*
|
|
* routines to send LCP echos to peer
|
|
*/
|
|
|
|
static void lcp_echo_lowerup (int);
|
|
static void lcp_echo_lowerdown (int);
|
|
static void LcpEchoTimeout (void*);
|
|
static void lcp_received_echo_reply (fsm*, int, u_char*, int);
|
|
static void LcpSendEchoRequest (fsm*);
|
|
static void LcpLinkFailure (fsm*);
|
|
static void LcpEchoCheck (fsm*);
|
|
|
|
static fsm_callbacks lcp_callbacks = { /* LCP callback routines */
|
|
lcp_resetci, /* Reset our Configuration Information */
|
|
lcp_cilen, /* Length of our Configuration Information */
|
|
lcp_addci, /* Add our Configuration Information */
|
|
lcp_ackci, /* ACK our Configuration Information */
|
|
lcp_nakci, /* NAK our Configuration Information */
|
|
lcp_rejci, /* Reject our Configuration Information */
|
|
lcp_reqci, /* Request peer's Configuration Information */
|
|
lcp_up, /* Called when fsm reaches LS_OPENED state */
|
|
lcp_down, /* Called when fsm leaves LS_OPENED state */
|
|
lcp_starting, /* Called when we want the lower layer up */
|
|
lcp_finished, /* Called when we want the lower layer down */
|
|
NULL, /* Called when Protocol-Reject received */
|
|
NULL, /* Retransmission is necessary */
|
|
lcp_extcode, /* Called to handle LCP-specific codes */
|
|
"LCP" /* String name of protocol */
|
|
};
|
|
|
|
/*
|
|
* Protocol entry points.
|
|
* Some of these are called directly.
|
|
*/
|
|
|
|
static void lcp_input (int, u_char *, int);
|
|
static void lcp_protrej (int);
|
|
|
|
struct protent lcp_protent = {
|
|
PPP_LCP,
|
|
lcp_init,
|
|
lcp_input,
|
|
lcp_protrej,
|
|
lcp_lowerup,
|
|
lcp_lowerdown,
|
|
lcp_open,
|
|
lcp_close,
|
|
#if PPP_ADDITIONAL_CALLBACKS
|
|
lcp_printpkt,
|
|
NULL,
|
|
#endif /* PPP_ADDITIONAL_CALLBACKS */
|
|
1,
|
|
"LCP",
|
|
#if PPP_ADDITIONAL_CALLBACKS
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
#endif /* PPP_ADDITIONAL_CALLBACKS */
|
|
};
|
|
|
|
int lcp_loopbackfail = DEFLOOPBACKFAIL;
|
|
|
|
/*
|
|
* Length of each type of configuration option (in octets)
|
|
*/
|
|
#define CILEN_VOID 2
|
|
#define CILEN_CHAR 3
|
|
#define CILEN_SHORT 4 /* CILEN_VOID + sizeof(short) */
|
|
#define CILEN_CHAP 5 /* CILEN_VOID + sizeof(short) + 1 */
|
|
#define CILEN_LONG 6 /* CILEN_VOID + sizeof(long) */
|
|
#define CILEN_LQR 8 /* CILEN_VOID + sizeof(short) + sizeof(long) */
|
|
#define CILEN_CBCP 3
|
|
|
|
#define CODENAME(x) ((x) == CONFACK ? "ACK" : (x) == CONFNAK ? "NAK" : "REJ")
|
|
|
|
#if 0 /* UNUSED */
|
|
/*
|
|
* setescape - add chars to the set we escape on transmission.
|
|
*/
|
|
static int
|
|
setescape(argv)
|
|
char **argv;
|
|
{
|
|
int n, ret;
|
|
char *p, *endp;
|
|
|
|
p = *argv;
|
|
ret = 1;
|
|
while (*p) {
|
|
n = strtol(p, &endp, 16);
|
|
if (p == endp) {
|
|
option_error("escape parameter contains invalid hex number '%s'", p);
|
|
return 0;
|
|
}
|
|
p = endp;
|
|
if (n < 0 || n == 0x5E || n > 0xFF) {
|
|
option_error("can't escape character 0x%x", n);
|
|
ret = 0;
|
|
} else
|
|
xmit_accm[0][n >> 5] |= 1 << (n & 0x1F);
|
|
while (*p == ',' || *p == ' ')
|
|
++p;
|
|
}
|
|
return ret;
|
|
}
|
|
#endif /* UNUSED */
|
|
|
|
/*
|
|
* lcp_init - Initialize LCP.
|
|
*/
|
|
void
|
|
lcp_init(int unit)
|
|
{
|
|
fsm *f = &lcp_fsm[unit];
|
|
lcp_options *wo = &lcp_wantoptions[unit];
|
|
lcp_options *ao = &lcp_allowoptions[unit];
|
|
|
|
f->unit = unit;
|
|
f->protocol = PPP_LCP;
|
|
f->callbacks = &lcp_callbacks;
|
|
|
|
fsm_init(f);
|
|
|
|
wo->passive = 0;
|
|
wo->silent = 0;
|
|
wo->restart = 0; /* Set to 1 in kernels or multi-line implementations */
|
|
wo->neg_mru = 1;
|
|
wo->mru = PPP_DEFMRU;
|
|
wo->neg_asyncmap = 1;
|
|
wo->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
|
|
wo->neg_chap = 0; /* Set to 1 on server */
|
|
wo->neg_upap = 0; /* Set to 1 on server */
|
|
wo->chap_mdtype = CHAP_DIGEST_MD5;
|
|
wo->neg_magicnumber = 1;
|
|
wo->neg_pcompression = 1;
|
|
wo->neg_accompression = 1;
|
|
wo->neg_lqr = 0; /* no LQR implementation yet */
|
|
wo->neg_cbcp = 0;
|
|
|
|
ao->neg_mru = 1;
|
|
ao->mru = PPP_MAXMRU;
|
|
ao->neg_asyncmap = 1;
|
|
ao->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
|
|
ao->neg_chap = (CHAP_SUPPORT != 0);
|
|
ao->chap_mdtype = CHAP_DIGEST_MD5;
|
|
ao->neg_upap = (PAP_SUPPORT != 0);
|
|
ao->neg_magicnumber = 1;
|
|
ao->neg_pcompression = 1;
|
|
ao->neg_accompression = 1;
|
|
ao->neg_lqr = 0; /* no LQR implementation yet */
|
|
ao->neg_cbcp = (CBCP_SUPPORT != 0);
|
|
|
|
/*
|
|
* Set transmit escape for the flag and escape characters plus anything
|
|
* set for the allowable options.
|
|
*/
|
|
memset(xmit_accm[unit], 0, sizeof(xmit_accm[0]));
|
|
xmit_accm[unit][15] = 0x60;
|
|
xmit_accm[unit][0] = (u_char)((ao->asyncmap & 0xFF));
|
|
xmit_accm[unit][1] = (u_char)((ao->asyncmap >> 8) & 0xFF);
|
|
xmit_accm[unit][2] = (u_char)((ao->asyncmap >> 16) & 0xFF);
|
|
xmit_accm[unit][3] = (u_char)((ao->asyncmap >> 24) & 0xFF);
|
|
LCPDEBUG(LOG_INFO, ("lcp_init: xmit_accm=%X %X %X %X\n",
|
|
xmit_accm[unit][0],
|
|
xmit_accm[unit][1],
|
|
xmit_accm[unit][2],
|
|
xmit_accm[unit][3]));
|
|
|
|
lcp_phase[unit] = PHASE_INITIALIZE;
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_open - LCP is allowed to come up.
|
|
*/
|
|
void
|
|
lcp_open(int unit)
|
|
{
|
|
fsm *f = &lcp_fsm[unit];
|
|
lcp_options *wo = &lcp_wantoptions[unit];
|
|
|
|
f->flags = 0;
|
|
if (wo->passive) {
|
|
f->flags |= OPT_PASSIVE;
|
|
}
|
|
if (wo->silent) {
|
|
f->flags |= OPT_SILENT;
|
|
}
|
|
fsm_open(f);
|
|
|
|
lcp_phase[unit] = PHASE_ESTABLISH;
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_close - Take LCP down.
|
|
*/
|
|
void
|
|
lcp_close(int unit, char *reason)
|
|
{
|
|
fsm *f = &lcp_fsm[unit];
|
|
|
|
if (lcp_phase[unit] != PHASE_DEAD) {
|
|
lcp_phase[unit] = PHASE_TERMINATE;
|
|
}
|
|
if (f->state == LS_STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
|
|
/*
|
|
* This action is not strictly according to the FSM in RFC1548,
|
|
* but it does mean that the program terminates if you do an
|
|
* lcp_close() in passive/silent mode when a connection hasn't
|
|
* been established.
|
|
*/
|
|
f->state = LS_CLOSED;
|
|
lcp_finished(f);
|
|
} else {
|
|
fsm_close(f, reason);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_lowerup - The lower layer is up.
|
|
*/
|
|
void
|
|
lcp_lowerup(int unit)
|
|
{
|
|
lcp_options *wo = &lcp_wantoptions[unit];
|
|
|
|
/*
|
|
* Don't use A/C or protocol compression on transmission,
|
|
* but accept A/C and protocol compressed packets
|
|
* if we are going to ask for A/C and protocol compression.
|
|
*/
|
|
ppp_set_xaccm(unit, &xmit_accm[unit]);
|
|
ppp_send_config(unit, PPP_MRU, 0xffffffffl, 0, 0);
|
|
ppp_recv_config(unit, PPP_MRU, 0x00000000l,
|
|
wo->neg_pcompression, wo->neg_accompression);
|
|
peer_mru[unit] = PPP_MRU;
|
|
lcp_allowoptions[unit].asyncmap = (u_long)xmit_accm[unit][0]
|
|
| ((u_long)xmit_accm[unit][1] << 8)
|
|
| ((u_long)xmit_accm[unit][2] << 16)
|
|
| ((u_long)xmit_accm[unit][3] << 24);
|
|
LCPDEBUG(LOG_INFO, ("lcp_lowerup: asyncmap=%X %X %X %X\n",
|
|
xmit_accm[unit][3],
|
|
xmit_accm[unit][2],
|
|
xmit_accm[unit][1],
|
|
xmit_accm[unit][0]));
|
|
|
|
fsm_lowerup(&lcp_fsm[unit]);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_lowerdown - The lower layer is down.
|
|
*/
|
|
void
|
|
lcp_lowerdown(int unit)
|
|
{
|
|
fsm_lowerdown(&lcp_fsm[unit]);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_input - Input LCP packet.
|
|
*/
|
|
static void
|
|
lcp_input(int unit, u_char *p, int len)
|
|
{
|
|
fsm *f = &lcp_fsm[unit];
|
|
|
|
fsm_input(f, p, len);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_extcode - Handle a LCP-specific code.
|
|
*/
|
|
static int
|
|
lcp_extcode(fsm *f, int code, u_char id, u_char *inp, int len)
|
|
{
|
|
u_char *magp;
|
|
|
|
switch( code ){
|
|
case PROTREJ:
|
|
lcp_rprotrej(f, inp, len);
|
|
break;
|
|
|
|
case ECHOREQ:
|
|
if (f->state != LS_OPENED) {
|
|
break;
|
|
}
|
|
LCPDEBUG(LOG_INFO, ("lcp: Echo-Request, Rcvd id %d\n", id));
|
|
magp = inp;
|
|
PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
|
|
fsm_sdata(f, ECHOREP, id, inp, len);
|
|
break;
|
|
|
|
case ECHOREP:
|
|
lcp_received_echo_reply(f, id, inp, len);
|
|
break;
|
|
|
|
case DISCREQ:
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_rprotrej - Receive an Protocol-Reject.
|
|
*
|
|
* Figure out which protocol is rejected and inform it.
|
|
*/
|
|
static void
|
|
lcp_rprotrej(fsm *f, u_char *inp, int len)
|
|
{
|
|
int i;
|
|
struct protent *protp;
|
|
u_short prot;
|
|
|
|
if (len < (int)sizeof (u_short)) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_rprotrej: Rcvd short Protocol-Reject packet!\n"));
|
|
return;
|
|
}
|
|
|
|
GETSHORT(prot, inp);
|
|
|
|
LCPDEBUG(LOG_INFO, ("lcp_rprotrej: Rcvd Protocol-Reject packet for %x!\n", prot));
|
|
|
|
/*
|
|
* Protocol-Reject packets received in any state other than the LCP
|
|
* LS_OPENED state SHOULD be silently discarded.
|
|
*/
|
|
if( f->state != LS_OPENED ) {
|
|
LCPDEBUG(LOG_INFO, ("Protocol-Reject discarded: LCP in state %d\n", f->state));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Upcall the proper Protocol-Reject routine.
|
|
*/
|
|
for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
|
|
if (protp->protocol == prot && protp->enabled_flag) {
|
|
(*protp->protrej)(f->unit);
|
|
return;
|
|
}
|
|
}
|
|
|
|
LCPDEBUG(LOG_WARNING, ("Protocol-Reject for unsupported protocol 0x%x\n", prot));
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_protrej - A Protocol-Reject was received.
|
|
*/
|
|
static void
|
|
lcp_protrej(int unit)
|
|
{
|
|
LWIP_UNUSED_ARG(unit);
|
|
/*
|
|
* Can't reject LCP!
|
|
*/
|
|
LCPDEBUG(LOG_WARNING, ("lcp_protrej: Received Protocol-Reject for LCP!\n"));
|
|
fsm_protreject(&lcp_fsm[unit]);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_sprotrej - Send a Protocol-Reject for some protocol.
|
|
*/
|
|
void
|
|
lcp_sprotrej(int unit, u_char *p, int len)
|
|
{
|
|
/*
|
|
* Send back the protocol and the information field of the
|
|
* rejected packet. We only get here if LCP is in the LS_OPENED state.
|
|
*/
|
|
|
|
fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id, p, len);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_resetci - Reset our CI.
|
|
*/
|
|
static void
|
|
lcp_resetci(fsm *f)
|
|
{
|
|
lcp_wantoptions[f->unit].magicnumber = magic();
|
|
lcp_wantoptions[f->unit].numloops = 0;
|
|
lcp_gotoptions[f->unit] = lcp_wantoptions[f->unit];
|
|
peer_mru[f->unit] = PPP_MRU;
|
|
auth_reset(f->unit);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_cilen - Return length of our CI.
|
|
*/
|
|
static int
|
|
lcp_cilen(fsm *f)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
|
|
#define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
|
|
#define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
|
|
#define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
|
|
#define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
|
|
#define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
|
|
#define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
|
|
/*
|
|
* NB: we only ask for one of CHAP and UPAP, even if we will
|
|
* accept either.
|
|
*/
|
|
return (LENCISHORT(go->neg_mru && go->mru != PPP_DEFMRU) +
|
|
LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) +
|
|
LENCICHAP(go->neg_chap) +
|
|
LENCISHORT(!go->neg_chap && go->neg_upap) +
|
|
LENCILQR(go->neg_lqr) +
|
|
LENCICBCP(go->neg_cbcp) +
|
|
LENCILONG(go->neg_magicnumber) +
|
|
LENCIVOID(go->neg_pcompression) +
|
|
LENCIVOID(go->neg_accompression));
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_addci - Add our desired CIs to a packet.
|
|
*/
|
|
static void
|
|
lcp_addci(fsm *f, u_char *ucp, int *lenp)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
u_char *start_ucp = ucp;
|
|
|
|
#define ADDCIVOID(opt, neg) \
|
|
if (neg) { \
|
|
LCPDEBUG(LOG_INFO, ("lcp_addci: opt=%d\n", opt)); \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_VOID, ucp); \
|
|
}
|
|
#define ADDCISHORT(opt, neg, val) \
|
|
if (neg) { \
|
|
LCPDEBUG(LOG_INFO, ("lcp_addci: INT opt=%d %X\n", opt, val)); \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_SHORT, ucp); \
|
|
PUTSHORT(val, ucp); \
|
|
}
|
|
#define ADDCICHAP(opt, neg, val, digest) \
|
|
if (neg) { \
|
|
LCPDEBUG(LOG_INFO, ("lcp_addci: CHAP opt=%d %X\n", opt, val)); \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_CHAP, ucp); \
|
|
PUTSHORT(val, ucp); \
|
|
PUTCHAR(digest, ucp); \
|
|
}
|
|
#define ADDCILONG(opt, neg, val) \
|
|
if (neg) { \
|
|
LCPDEBUG(LOG_INFO, ("lcp_addci: L opt=%d %lX\n", opt, val)); \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_LONG, ucp); \
|
|
PUTLONG(val, ucp); \
|
|
}
|
|
#define ADDCILQR(opt, neg, val) \
|
|
if (neg) { \
|
|
LCPDEBUG(LOG_INFO, ("lcp_addci: LQR opt=%d %lX\n", opt, val)); \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_LQR, ucp); \
|
|
PUTSHORT(PPP_LQR, ucp); \
|
|
PUTLONG(val, ucp); \
|
|
}
|
|
#define ADDCICHAR(opt, neg, val) \
|
|
if (neg) { \
|
|
LCPDEBUG(LOG_INFO, ("lcp_addci: CHAR opt=%d %X '%z'\n", opt, val, val)); \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_CHAR, ucp); \
|
|
PUTCHAR(val, ucp); \
|
|
}
|
|
|
|
ADDCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
|
|
ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl, go->asyncmap);
|
|
ADDCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
|
|
ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
|
|
ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
|
|
ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
|
|
ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
|
|
ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
|
|
ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
|
|
|
|
if (ucp - start_ucp != *lenp) {
|
|
/* this should never happen, because peer_mtu should be 1500 */
|
|
LCPDEBUG(LOG_ERR, ("Bug in lcp_addci: wrong length\n"));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_ackci - Ack our CIs.
|
|
* This should not modify any state if the Ack is bad.
|
|
*
|
|
* Returns:
|
|
* 0 - Ack was bad.
|
|
* 1 - Ack was good.
|
|
*/
|
|
static int
|
|
lcp_ackci(fsm *f, u_char *p, int len)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
u_char cilen, citype, cichar;
|
|
u_short cishort;
|
|
u32_t cilong;
|
|
|
|
/*
|
|
* CIs must be in exactly the same order that we sent.
|
|
* Check packet length and CI length at each step.
|
|
* If we find any deviations, then this packet is bad.
|
|
*/
|
|
#define ACKCIVOID(opt, neg) \
|
|
if (neg) { \
|
|
if ((len -= CILEN_VOID) < 0) \
|
|
goto bad; \
|
|
GETCHAR(citype, p); \
|
|
GETCHAR(cilen, p); \
|
|
if (cilen != CILEN_VOID || citype != opt) \
|
|
goto bad; \
|
|
}
|
|
#define ACKCISHORT(opt, neg, val) \
|
|
if (neg) { \
|
|
if ((len -= CILEN_SHORT) < 0) \
|
|
goto bad; \
|
|
GETCHAR(citype, p); \
|
|
GETCHAR(cilen, p); \
|
|
if (cilen != CILEN_SHORT || citype != opt) \
|
|
goto bad; \
|
|
GETSHORT(cishort, p); \
|
|
if (cishort != val) \
|
|
goto bad; \
|
|
}
|
|
#define ACKCICHAR(opt, neg, val) \
|
|
if (neg) { \
|
|
if ((len -= CILEN_CHAR) < 0) \
|
|
goto bad; \
|
|
GETCHAR(citype, p); \
|
|
GETCHAR(cilen, p); \
|
|
if (cilen != CILEN_CHAR || citype != opt) \
|
|
goto bad; \
|
|
GETCHAR(cichar, p); \
|
|
if (cichar != val) \
|
|
goto bad; \
|
|
}
|
|
#define ACKCICHAP(opt, neg, val, digest) \
|
|
if (neg) { \
|
|
if ((len -= CILEN_CHAP) < 0) \
|
|
goto bad; \
|
|
GETCHAR(citype, p); \
|
|
GETCHAR(cilen, p); \
|
|
if (cilen != CILEN_CHAP || citype != opt) \
|
|
goto bad; \
|
|
GETSHORT(cishort, p); \
|
|
if (cishort != val) \
|
|
goto bad; \
|
|
GETCHAR(cichar, p); \
|
|
if (cichar != digest) \
|
|
goto bad; \
|
|
}
|
|
#define ACKCILONG(opt, neg, val) \
|
|
if (neg) { \
|
|
if ((len -= CILEN_LONG) < 0) \
|
|
goto bad; \
|
|
GETCHAR(citype, p); \
|
|
GETCHAR(cilen, p); \
|
|
if (cilen != CILEN_LONG || citype != opt) \
|
|
goto bad; \
|
|
GETLONG(cilong, p); \
|
|
if (cilong != val) \
|
|
goto bad; \
|
|
}
|
|
#define ACKCILQR(opt, neg, val) \
|
|
if (neg) { \
|
|
if ((len -= CILEN_LQR) < 0) \
|
|
goto bad; \
|
|
GETCHAR(citype, p); \
|
|
GETCHAR(cilen, p); \
|
|
if (cilen != CILEN_LQR || citype != opt) \
|
|
goto bad; \
|
|
GETSHORT(cishort, p); \
|
|
if (cishort != PPP_LQR) \
|
|
goto bad; \
|
|
GETLONG(cilong, p); \
|
|
if (cilong != val) \
|
|
goto bad; \
|
|
}
|
|
|
|
ACKCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
|
|
ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl, go->asyncmap);
|
|
ACKCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
|
|
ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
|
|
ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
|
|
ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
|
|
ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
|
|
ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
|
|
ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
|
|
|
|
/*
|
|
* If there are any remaining CIs, then this packet is bad.
|
|
*/
|
|
if (len != 0) {
|
|
goto bad;
|
|
}
|
|
LCPDEBUG(LOG_INFO, ("lcp_acki: Ack\n"));
|
|
return (1);
|
|
bad:
|
|
LCPDEBUG(LOG_WARNING, ("lcp_acki: received bad Ack!\n"));
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_nakci - Peer has sent a NAK for some of our CIs.
|
|
* This should not modify any state if the Nak is bad
|
|
* or if LCP is in the LS_OPENED state.
|
|
*
|
|
* Returns:
|
|
* 0 - Nak was bad.
|
|
* 1 - Nak was good.
|
|
*/
|
|
static int
|
|
lcp_nakci(fsm *f, u_char *p, int len)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
lcp_options *wo = &lcp_wantoptions[f->unit];
|
|
u_char citype, cichar, *next;
|
|
u_short cishort;
|
|
u32_t cilong;
|
|
lcp_options no; /* options we've seen Naks for */
|
|
lcp_options try; /* options to request next time */
|
|
int looped_back = 0;
|
|
int cilen;
|
|
|
|
BZERO(&no, sizeof(no));
|
|
try = *go;
|
|
|
|
/*
|
|
* Any Nak'd CIs must be in exactly the same order that we sent.
|
|
* Check packet length and CI length at each step.
|
|
* If we find any deviations, then this packet is bad.
|
|
*/
|
|
#define NAKCIVOID(opt, neg, code) \
|
|
if (go->neg && \
|
|
len >= CILEN_VOID && \
|
|
p[1] == CILEN_VOID && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_VOID; \
|
|
INCPTR(CILEN_VOID, p); \
|
|
no.neg = 1; \
|
|
code \
|
|
}
|
|
#define NAKCICHAP(opt, neg, code) \
|
|
if (go->neg && \
|
|
len >= CILEN_CHAP && \
|
|
p[1] == CILEN_CHAP && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_CHAP; \
|
|
INCPTR(2, p); \
|
|
GETSHORT(cishort, p); \
|
|
GETCHAR(cichar, p); \
|
|
no.neg = 1; \
|
|
code \
|
|
}
|
|
#define NAKCICHAR(opt, neg, code) \
|
|
if (go->neg && \
|
|
len >= CILEN_CHAR && \
|
|
p[1] == CILEN_CHAR && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_CHAR; \
|
|
INCPTR(2, p); \
|
|
GETCHAR(cichar, p); \
|
|
no.neg = 1; \
|
|
code \
|
|
}
|
|
#define NAKCISHORT(opt, neg, code) \
|
|
if (go->neg && \
|
|
len >= CILEN_SHORT && \
|
|
p[1] == CILEN_SHORT && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_SHORT; \
|
|
INCPTR(2, p); \
|
|
GETSHORT(cishort, p); \
|
|
no.neg = 1; \
|
|
code \
|
|
}
|
|
#define NAKCILONG(opt, neg, code) \
|
|
if (go->neg && \
|
|
len >= CILEN_LONG && \
|
|
p[1] == CILEN_LONG && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_LONG; \
|
|
INCPTR(2, p); \
|
|
GETLONG(cilong, p); \
|
|
no.neg = 1; \
|
|
code \
|
|
}
|
|
#define NAKCILQR(opt, neg, code) \
|
|
if (go->neg && \
|
|
len >= CILEN_LQR && \
|
|
p[1] == CILEN_LQR && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_LQR; \
|
|
INCPTR(2, p); \
|
|
GETSHORT(cishort, p); \
|
|
GETLONG(cilong, p); \
|
|
no.neg = 1; \
|
|
code \
|
|
}
|
|
|
|
/*
|
|
* We don't care if they want to send us smaller packets than
|
|
* we want. Therefore, accept any MRU less than what we asked for,
|
|
* but then ignore the new value when setting the MRU in the kernel.
|
|
* If they send us a bigger MRU than what we asked, accept it, up to
|
|
* the limit of the default MRU we'd get if we didn't negotiate.
|
|
*/
|
|
if (go->neg_mru && go->mru != PPP_DEFMRU) {
|
|
NAKCISHORT(CI_MRU, neg_mru,
|
|
if (cishort <= wo->mru || cishort < PPP_DEFMRU) {
|
|
try.mru = cishort;
|
|
}
|
|
);
|
|
}
|
|
|
|
/*
|
|
* Add any characters they want to our (receive-side) asyncmap.
|
|
*/
|
|
if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) {
|
|
NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
|
|
try.asyncmap = go->asyncmap | cilong;
|
|
);
|
|
}
|
|
|
|
/*
|
|
* If they've nak'd our authentication-protocol, check whether
|
|
* they are proposing a different protocol, or a different
|
|
* hash algorithm for CHAP.
|
|
*/
|
|
if ((go->neg_chap || go->neg_upap)
|
|
&& len >= CILEN_SHORT
|
|
&& p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
|
|
cilen = p[1];
|
|
len -= cilen;
|
|
no.neg_chap = go->neg_chap;
|
|
no.neg_upap = go->neg_upap;
|
|
INCPTR(2, p);
|
|
GETSHORT(cishort, p);
|
|
if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
|
|
/*
|
|
* If we were asking for CHAP, they obviously don't want to do it.
|
|
* If we weren't asking for CHAP, then we were asking for PAP,
|
|
* in which case this Nak is bad.
|
|
*/
|
|
if (!go->neg_chap) {
|
|
goto bad;
|
|
}
|
|
try.neg_chap = 0;
|
|
|
|
} else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
|
|
GETCHAR(cichar, p);
|
|
if (go->neg_chap) {
|
|
/*
|
|
* We were asking for CHAP/MD5; they must want a different
|
|
* algorithm. If they can't do MD5, we'll have to stop
|
|
* asking for CHAP.
|
|
*/
|
|
if (cichar != go->chap_mdtype) {
|
|
try.neg_chap = 0;
|
|
}
|
|
} else {
|
|
/*
|
|
* Stop asking for PAP if we were asking for it.
|
|
*/
|
|
try.neg_upap = 0;
|
|
}
|
|
|
|
} else {
|
|
/*
|
|
* We don't recognize what they're suggesting.
|
|
* Stop asking for what we were asking for.
|
|
*/
|
|
if (go->neg_chap) {
|
|
try.neg_chap = 0;
|
|
} else {
|
|
try.neg_upap = 0;
|
|
}
|
|
p += cilen - CILEN_SHORT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If they can't cope with our link quality protocol, we'll have
|
|
* to stop asking for LQR. We haven't got any other protocol.
|
|
* If they Nak the reporting period, take their value XXX ?
|
|
*/
|
|
NAKCILQR(CI_QUALITY, neg_lqr,
|
|
if (cishort != PPP_LQR) {
|
|
try.neg_lqr = 0;
|
|
} else {
|
|
try.lqr_period = cilong;
|
|
}
|
|
);
|
|
|
|
/*
|
|
* Only implementing CBCP...not the rest of the callback options
|
|
*/
|
|
NAKCICHAR(CI_CALLBACK, neg_cbcp,
|
|
try.neg_cbcp = 0;
|
|
);
|
|
|
|
/*
|
|
* Check for a looped-back line.
|
|
*/
|
|
NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
|
|
try.magicnumber = magic();
|
|
looped_back = 1;
|
|
);
|
|
|
|
/*
|
|
* Peer shouldn't send Nak for protocol compression or
|
|
* address/control compression requests; they should send
|
|
* a Reject instead. If they send a Nak, treat it as a Reject.
|
|
*/
|
|
NAKCIVOID(CI_PCOMPRESSION, neg_pcompression,
|
|
try.neg_pcompression = 0;
|
|
);
|
|
NAKCIVOID(CI_ACCOMPRESSION, neg_accompression,
|
|
try.neg_accompression = 0;
|
|
);
|
|
|
|
/*
|
|
* There may be remaining CIs, if the peer is requesting negotiation
|
|
* on an option that we didn't include in our request packet.
|
|
* If we see an option that we requested, or one we've already seen
|
|
* in this packet, then this packet is bad.
|
|
* If we wanted to respond by starting to negotiate on the requested
|
|
* option(s), we could, but we don't, because except for the
|
|
* authentication type and quality protocol, if we are not negotiating
|
|
* an option, it is because we were told not to.
|
|
* For the authentication type, the Nak from the peer means
|
|
* `let me authenticate myself with you' which is a bit pointless.
|
|
* For the quality protocol, the Nak means `ask me to send you quality
|
|
* reports', but if we didn't ask for them, we don't want them.
|
|
* An option we don't recognize represents the peer asking to
|
|
* negotiate some option we don't support, so ignore it.
|
|
*/
|
|
while (len > CILEN_VOID) {
|
|
GETCHAR(citype, p);
|
|
GETCHAR(cilen, p);
|
|
if (cilen < CILEN_VOID || (len -= cilen) < 0) {
|
|
goto bad;
|
|
}
|
|
next = p + cilen - 2;
|
|
|
|
switch (citype) {
|
|
case CI_MRU:
|
|
if ((go->neg_mru && go->mru != PPP_DEFMRU)
|
|
|| no.neg_mru || cilen != CILEN_SHORT) {
|
|
goto bad;
|
|
}
|
|
GETSHORT(cishort, p);
|
|
if (cishort < PPP_DEFMRU) {
|
|
try.mru = cishort;
|
|
}
|
|
break;
|
|
case CI_ASYNCMAP:
|
|
if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl)
|
|
|| no.neg_asyncmap || cilen != CILEN_LONG) {
|
|
goto bad;
|
|
}
|
|
break;
|
|
case CI_AUTHTYPE:
|
|
if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap) {
|
|
goto bad;
|
|
}
|
|
break;
|
|
case CI_MAGICNUMBER:
|
|
if (go->neg_magicnumber || no.neg_magicnumber ||
|
|
cilen != CILEN_LONG) {
|
|
goto bad;
|
|
}
|
|
break;
|
|
case CI_PCOMPRESSION:
|
|
if (go->neg_pcompression || no.neg_pcompression
|
|
|| cilen != CILEN_VOID) {
|
|
goto bad;
|
|
}
|
|
break;
|
|
case CI_ACCOMPRESSION:
|
|
if (go->neg_accompression || no.neg_accompression
|
|
|| cilen != CILEN_VOID) {
|
|
goto bad;
|
|
}
|
|
break;
|
|
case CI_QUALITY:
|
|
if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR) {
|
|
goto bad;
|
|
}
|
|
break;
|
|
}
|
|
p = next;
|
|
}
|
|
|
|
/* If there is still anything left, this packet is bad. */
|
|
if (len != 0) {
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* OK, the Nak is good. Now we can update state.
|
|
*/
|
|
if (f->state != LS_OPENED) {
|
|
if (looped_back) {
|
|
if (++try.numloops >= lcp_loopbackfail) {
|
|
LCPDEBUG(LOG_NOTICE, ("Serial line is looped back.\n"));
|
|
lcp_close(f->unit, "Loopback detected");
|
|
}
|
|
} else {
|
|
try.numloops = 0;
|
|
}
|
|
*go = try;
|
|
}
|
|
|
|
return 1;
|
|
|
|
bad:
|
|
LCPDEBUG(LOG_WARNING, ("lcp_nakci: received bad Nak!\n"));
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_rejci - Peer has Rejected some of our CIs.
|
|
* This should not modify any state if the Reject is bad
|
|
* or if LCP is in the LS_OPENED state.
|
|
*
|
|
* Returns:
|
|
* 0 - Reject was bad.
|
|
* 1 - Reject was good.
|
|
*/
|
|
static int
|
|
lcp_rejci(fsm *f, u_char *p, int len)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
u_char cichar;
|
|
u_short cishort;
|
|
u32_t cilong;
|
|
lcp_options try; /* options to request next time */
|
|
|
|
try = *go;
|
|
|
|
/*
|
|
* Any Rejected CIs must be in exactly the same order that we sent.
|
|
* Check packet length and CI length at each step.
|
|
* If we find any deviations, then this packet is bad.
|
|
*/
|
|
#define REJCIVOID(opt, neg) \
|
|
if (go->neg && \
|
|
len >= CILEN_VOID && \
|
|
p[1] == CILEN_VOID && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_VOID; \
|
|
INCPTR(CILEN_VOID, p); \
|
|
try.neg = 0; \
|
|
LCPDEBUG(LOG_INFO, ("lcp_rejci: void opt %d rejected\n", opt)); \
|
|
}
|
|
#define REJCISHORT(opt, neg, val) \
|
|
if (go->neg && \
|
|
len >= CILEN_SHORT && \
|
|
p[1] == CILEN_SHORT && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_SHORT; \
|
|
INCPTR(2, p); \
|
|
GETSHORT(cishort, p); \
|
|
/* Check rejected value. */ \
|
|
if (cishort != val) { \
|
|
goto bad; \
|
|
} \
|
|
try.neg = 0; \
|
|
LCPDEBUG(LOG_INFO, ("lcp_rejci: short opt %d rejected\n", opt)); \
|
|
}
|
|
#define REJCICHAP(opt, neg, val, digest) \
|
|
if (go->neg && \
|
|
len >= CILEN_CHAP && \
|
|
p[1] == CILEN_CHAP && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_CHAP; \
|
|
INCPTR(2, p); \
|
|
GETSHORT(cishort, p); \
|
|
GETCHAR(cichar, p); \
|
|
/* Check rejected value. */ \
|
|
if (cishort != val || cichar != digest) { \
|
|
goto bad; \
|
|
} \
|
|
try.neg = 0; \
|
|
try.neg_upap = 0; \
|
|
LCPDEBUG(LOG_INFO, ("lcp_rejci: chap opt %d rejected\n", opt)); \
|
|
}
|
|
#define REJCILONG(opt, neg, val) \
|
|
if (go->neg && \
|
|
len >= CILEN_LONG && \
|
|
p[1] == CILEN_LONG && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_LONG; \
|
|
INCPTR(2, p); \
|
|
GETLONG(cilong, p); \
|
|
/* Check rejected value. */ \
|
|
if (cilong != val) { \
|
|
goto bad; \
|
|
} \
|
|
try.neg = 0; \
|
|
LCPDEBUG(LOG_INFO, ("lcp_rejci: long opt %d rejected\n", opt)); \
|
|
}
|
|
#define REJCILQR(opt, neg, val) \
|
|
if (go->neg && \
|
|
len >= CILEN_LQR && \
|
|
p[1] == CILEN_LQR && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_LQR; \
|
|
INCPTR(2, p); \
|
|
GETSHORT(cishort, p); \
|
|
GETLONG(cilong, p); \
|
|
/* Check rejected value. */ \
|
|
if (cishort != PPP_LQR || cilong != val) { \
|
|
goto bad; \
|
|
} \
|
|
try.neg = 0; \
|
|
LCPDEBUG(LOG_INFO, ("lcp_rejci: LQR opt %d rejected\n", opt)); \
|
|
}
|
|
#define REJCICBCP(opt, neg, val) \
|
|
if (go->neg && \
|
|
len >= CILEN_CBCP && \
|
|
p[1] == CILEN_CBCP && \
|
|
p[0] == opt) { \
|
|
len -= CILEN_CBCP; \
|
|
INCPTR(2, p); \
|
|
GETCHAR(cichar, p); \
|
|
/* Check rejected value. */ \
|
|
if (cichar != val) { \
|
|
goto bad; \
|
|
} \
|
|
try.neg = 0; \
|
|
LCPDEBUG(LOG_INFO, ("lcp_rejci: Callback opt %d rejected\n", opt)); \
|
|
}
|
|
|
|
REJCISHORT(CI_MRU, neg_mru, go->mru);
|
|
REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
|
|
REJCICHAP(CI_AUTHTYPE, neg_chap, PPP_CHAP, go->chap_mdtype);
|
|
if (!go->neg_chap) {
|
|
REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
|
|
}
|
|
REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
|
|
REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
|
|
REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
|
|
REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
|
|
REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
|
|
|
|
/*
|
|
* If there are any remaining CIs, then this packet is bad.
|
|
*/
|
|
if (len != 0) {
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Now we can update state.
|
|
*/
|
|
if (f->state != LS_OPENED) {
|
|
*go = try;
|
|
}
|
|
return 1;
|
|
|
|
bad:
|
|
LCPDEBUG(LOG_WARNING, ("lcp_rejci: received bad Reject!\n"));
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_reqci - Check the peer's requested CIs and send appropriate response.
|
|
*
|
|
* Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
|
|
* appropriately. If reject_if_disagree is non-zero, doesn't return
|
|
* CONFNAK; returns CONFREJ if it can't return CONFACK.
|
|
*/
|
|
static int
|
|
lcp_reqci(fsm *f,
|
|
u_char *inp, /* Requested CIs */
|
|
int *lenp, /* Length of requested CIs */
|
|
int reject_if_disagree)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
lcp_options *ho = &lcp_hisoptions[f->unit];
|
|
lcp_options *ao = &lcp_allowoptions[f->unit];
|
|
u_char *cip, *next; /* Pointer to current and next CIs */
|
|
int cilen, citype; /* Parsed len, type */
|
|
u_char cichar; /* Parsed char value */
|
|
u_short cishort; /* Parsed short value */
|
|
u32_t cilong; /* Parse long value */
|
|
int rc = CONFACK; /* Final packet return code */
|
|
int orc; /* Individual option return code */
|
|
u_char *p; /* Pointer to next char to parse */
|
|
u_char *rejp; /* Pointer to next char in reject frame */
|
|
u_char *nakp; /* Pointer to next char in Nak frame */
|
|
int l = *lenp; /* Length left */
|
|
#if TRACELCP > 0
|
|
char traceBuf[80];
|
|
size_t traceNdx = 0;
|
|
#endif
|
|
|
|
/*
|
|
* Reset all his options.
|
|
*/
|
|
BZERO(ho, sizeof(*ho));
|
|
|
|
/*
|
|
* Process all his options.
|
|
*/
|
|
next = inp;
|
|
nakp = nak_buffer;
|
|
rejp = inp;
|
|
while (l) {
|
|
orc = CONFACK; /* Assume success */
|
|
cip = p = next; /* Remember begining of CI */
|
|
if (l < 2 || /* Not enough data for CI header or */
|
|
p[1] < 2 || /* CI length too small or */
|
|
p[1] > l) { /* CI length too big? */
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: bad CI length!\n"));
|
|
orc = CONFREJ; /* Reject bad CI */
|
|
cilen = l; /* Reject till end of packet */
|
|
l = 0; /* Don't loop again */
|
|
citype = 0;
|
|
goto endswitch;
|
|
}
|
|
GETCHAR(citype, p); /* Parse CI type */
|
|
GETCHAR(cilen, p); /* Parse CI length */
|
|
l -= cilen; /* Adjust remaining length */
|
|
next += cilen; /* Step to next CI */
|
|
|
|
switch (citype) { /* Check CI type */
|
|
case CI_MRU:
|
|
if (!ao->neg_mru) { /* Allow option? */
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Reject MRU - not allowed\n"));
|
|
orc = CONFREJ; /* Reject CI */
|
|
break;
|
|
} else if (cilen != CILEN_SHORT) { /* Check CI length */
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Reject MRU - bad length\n"));
|
|
orc = CONFREJ; /* Reject CI */
|
|
break;
|
|
}
|
|
GETSHORT(cishort, p); /* Parse MRU */
|
|
|
|
/*
|
|
* He must be able to receive at least our minimum.
|
|
* No need to check a maximum. If he sends a large number,
|
|
* we'll just ignore it.
|
|
*/
|
|
if (cishort < PPP_MINMRU) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Nak - MRU too small\n"));
|
|
orc = CONFNAK; /* Nak CI */
|
|
PUTCHAR(CI_MRU, nakp);
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
|
PUTSHORT(PPP_MINMRU, nakp); /* Give him a hint */
|
|
break;
|
|
}
|
|
ho->neg_mru = 1; /* Remember he sent MRU */
|
|
ho->mru = cishort; /* And remember value */
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MRU %d", cishort);
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
break;
|
|
|
|
case CI_ASYNCMAP:
|
|
if (!ao->neg_asyncmap) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Reject ASYNCMAP not allowed\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
} else if (cilen != CILEN_LONG) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Reject ASYNCMAP bad length\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
GETLONG(cilong, p);
|
|
|
|
/*
|
|
* Asyncmap must have set at least the bits
|
|
* which are set in lcp_allowoptions[unit].asyncmap.
|
|
*/
|
|
if ((ao->asyncmap & ~cilong) != 0) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Nak ASYNCMAP %lX missing %lX\n",
|
|
cilong, ao->asyncmap));
|
|
orc = CONFNAK;
|
|
PUTCHAR(CI_ASYNCMAP, nakp);
|
|
PUTCHAR(CILEN_LONG, nakp);
|
|
PUTLONG(ao->asyncmap | cilong, nakp);
|
|
break;
|
|
}
|
|
ho->neg_asyncmap = 1;
|
|
ho->asyncmap = cilong;
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ASYNCMAP=%lX", cilong);
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
break;
|
|
|
|
case CI_AUTHTYPE:
|
|
if (cilen < CILEN_SHORT) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Reject AUTHTYPE missing arg\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
} else if (!(ao->neg_upap || ao->neg_chap)) {
|
|
/*
|
|
* Reject the option if we're not willing to authenticate.
|
|
*/
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: Reject AUTHTYPE not allowed\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
GETSHORT(cishort, p);
|
|
|
|
/*
|
|
* Authtype must be UPAP or CHAP.
|
|
*
|
|
* Note: if both ao->neg_upap and ao->neg_chap are set,
|
|
* and the peer sends a Configure-Request with two
|
|
* authenticate-protocol requests, one for CHAP and one
|
|
* for UPAP, then we will reject the second request.
|
|
* Whether we end up doing CHAP or UPAP depends then on
|
|
* the ordering of the CIs in the peer's Configure-Request.
|
|
*/
|
|
|
|
if (cishort == PPP_PAP) {
|
|
if (ho->neg_chap) { /* we've already accepted CHAP */
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Reject AUTHTYPE PAP already accepted\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
} else if (cilen != CILEN_SHORT) {
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Reject AUTHTYPE PAP bad len\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
if (!ao->neg_upap) { /* we don't want to do PAP */
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Nak AUTHTYPE PAP not allowed\n"));
|
|
orc = CONFNAK; /* NAK it and suggest CHAP */
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
|
PUTSHORT(PPP_CHAP, nakp);
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
|
break;
|
|
}
|
|
ho->neg_upap = 1;
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PAP (%X)", cishort);
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
break;
|
|
}
|
|
if (cishort == PPP_CHAP) {
|
|
if (ho->neg_upap) { /* we've already accepted PAP */
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Reject AUTHTYPE CHAP accepted PAP\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
} else if (cilen != CILEN_CHAP) {
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Reject AUTHTYPE CHAP bad len\n"));
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
if (!ao->neg_chap) { /* we don't want to do CHAP */
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Nak AUTHTYPE CHAP not allowed\n"));
|
|
orc = CONFNAK; /* NAK it and suggest PAP */
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
|
PUTSHORT(PPP_PAP, nakp);
|
|
break;
|
|
}
|
|
GETCHAR(cichar, p); /* get digest type*/
|
|
if (cichar != CHAP_DIGEST_MD5
|
|
#if MSCHAP_SUPPORT
|
|
&& cichar != CHAP_MICROSOFT
|
|
#endif
|
|
) {
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Nak AUTHTYPE CHAP digest=%d\n", (int)cichar));
|
|
orc = CONFNAK;
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
|
PUTSHORT(PPP_CHAP, nakp);
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
|
break;
|
|
}
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CHAP %X,%d", cishort, (int)cichar);
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
ho->chap_mdtype = cichar; /* save md type */
|
|
ho->neg_chap = 1;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We don't recognize the protocol they're asking for.
|
|
* Nak it with something we're willing to do.
|
|
* (At this point we know ao->neg_upap || ao->neg_chap.)
|
|
*/
|
|
orc = CONFNAK;
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
|
if (ao->neg_chap) {
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Nak AUTHTYPE %d req CHAP\n", cishort));
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
|
PUTSHORT(PPP_CHAP, nakp);
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
|
} else {
|
|
LCPDEBUG(LOG_WARNING, ("lcp_reqci: Nak AUTHTYPE %d req PAP\n", cishort));
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
|
PUTSHORT(PPP_PAP, nakp);
|
|
}
|
|
break;
|
|
|
|
case CI_QUALITY:
|
|
GETSHORT(cishort, p);
|
|
GETLONG(cilong, p);
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " QUALITY (%x %x)", cishort, (unsigned int) cilong);
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
|
|
if (!ao->neg_lqr ||
|
|
cilen != CILEN_LQR) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check the protocol and the reporting period.
|
|
* XXX When should we Nak this, and what with?
|
|
*/
|
|
if (cishort != PPP_LQR) {
|
|
orc = CONFNAK;
|
|
PUTCHAR(CI_QUALITY, nakp);
|
|
PUTCHAR(CILEN_LQR, nakp);
|
|
PUTSHORT(PPP_LQR, nakp);
|
|
PUTLONG(ao->lqr_period, nakp);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CI_MAGICNUMBER:
|
|
if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
|
|
cilen != CILEN_LONG) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
GETLONG(cilong, p);
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MAGICNUMBER (%lX)", cilong);
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
|
|
/*
|
|
* He must have a different magic number.
|
|
*/
|
|
if (go->neg_magicnumber &&
|
|
cilong == go->magicnumber) {
|
|
cilong = magic(); /* Don't put magic() inside macro! */
|
|
orc = CONFNAK;
|
|
PUTCHAR(CI_MAGICNUMBER, nakp);
|
|
PUTCHAR(CILEN_LONG, nakp);
|
|
PUTLONG(cilong, nakp);
|
|
break;
|
|
}
|
|
ho->neg_magicnumber = 1;
|
|
ho->magicnumber = cilong;
|
|
break;
|
|
|
|
|
|
case CI_PCOMPRESSION:
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PCOMPRESSION");
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
if (!ao->neg_pcompression ||
|
|
cilen != CILEN_VOID) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
ho->neg_pcompression = 1;
|
|
break;
|
|
|
|
case CI_ACCOMPRESSION:
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ACCOMPRESSION");
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
if (!ao->neg_accompression ||
|
|
cilen != CILEN_VOID) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
ho->neg_accompression = 1;
|
|
break;
|
|
|
|
case CI_MRRU:
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_MRRU");
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
orc = CONFREJ;
|
|
break;
|
|
|
|
case CI_SSNHF:
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_SSNHF");
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
orc = CONFREJ;
|
|
break;
|
|
|
|
case CI_EPDISC:
|
|
#if TRACELCP > 0
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_EPDISC");
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
orc = CONFREJ;
|
|
break;
|
|
|
|
default:
|
|
#if TRACELCP
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " unknown %d", citype);
|
|
traceNdx = strlen(traceBuf);
|
|
#endif
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
endswitch:
|
|
#if TRACELCP
|
|
if (traceNdx >= 80 - 32) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: rcvd%s\n", traceBuf));
|
|
traceNdx = 0;
|
|
}
|
|
#endif
|
|
if (orc == CONFACK && /* Good CI */
|
|
rc != CONFACK) { /* but prior CI wasnt? */
|
|
continue; /* Don't send this one */
|
|
}
|
|
|
|
if (orc == CONFNAK) { /* Nak this CI? */
|
|
if (reject_if_disagree /* Getting fed up with sending NAKs? */
|
|
&& citype != CI_MAGICNUMBER) {
|
|
orc = CONFREJ; /* Get tough if so */
|
|
} else {
|
|
if (rc == CONFREJ) { /* Rejecting prior CI? */
|
|
continue; /* Don't send this one */
|
|
}
|
|
rc = CONFNAK;
|
|
}
|
|
}
|
|
if (orc == CONFREJ) { /* Reject this CI */
|
|
rc = CONFREJ;
|
|
if (cip != rejp) { /* Need to move rejected CI? */
|
|
BCOPY(cip, rejp, cilen); /* Move it */
|
|
}
|
|
INCPTR(cilen, rejp); /* Update output pointer */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we wanted to send additional NAKs (for unsent CIs), the
|
|
* code would go here. The extra NAKs would go at *nakp.
|
|
* At present there are no cases where we want to ask the
|
|
* peer to negotiate an option.
|
|
*/
|
|
|
|
switch (rc) {
|
|
case CONFACK:
|
|
*lenp = (int)(next - inp);
|
|
break;
|
|
case CONFNAK:
|
|
/*
|
|
* Copy the Nak'd options from the nak_buffer to the caller's buffer.
|
|
*/
|
|
*lenp = (int)(nakp - nak_buffer);
|
|
BCOPY(nak_buffer, inp, *lenp);
|
|
break;
|
|
case CONFREJ:
|
|
*lenp = (int)(rejp - inp);
|
|
break;
|
|
}
|
|
|
|
#if TRACELCP > 0
|
|
if (traceNdx > 0) {
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: %s\n", traceBuf));
|
|
}
|
|
#endif
|
|
LCPDEBUG(LOG_INFO, ("lcp_reqci: returning CONF%s.\n", CODENAME(rc)));
|
|
return (rc); /* Return final code */
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_up - LCP has come UP.
|
|
*/
|
|
static void
|
|
lcp_up(fsm *f)
|
|
{
|
|
lcp_options *wo = &lcp_wantoptions[f->unit];
|
|
lcp_options *ho = &lcp_hisoptions[f->unit];
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
lcp_options *ao = &lcp_allowoptions[f->unit];
|
|
|
|
if (!go->neg_magicnumber) {
|
|
go->magicnumber = 0;
|
|
}
|
|
if (!ho->neg_magicnumber) {
|
|
ho->magicnumber = 0;
|
|
}
|
|
|
|
/*
|
|
* Set our MTU to the smaller of the MTU we wanted and
|
|
* the MRU our peer wanted. If we negotiated an MRU,
|
|
* set our MRU to the larger of value we wanted and
|
|
* the value we got in the negotiation.
|
|
*/
|
|
ppp_send_config(f->unit, LWIP_MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)),
|
|
(ho->neg_asyncmap? ho->asyncmap: 0xffffffffl),
|
|
ho->neg_pcompression, ho->neg_accompression);
|
|
/*
|
|
* If the asyncmap hasn't been negotiated, we really should
|
|
* set the receive asyncmap to ffffffff, but we set it to 0
|
|
* for backwards contemptibility.
|
|
*/
|
|
ppp_recv_config(f->unit, (go->neg_mru? LWIP_MAX(wo->mru, go->mru): PPP_MRU),
|
|
(go->neg_asyncmap? go->asyncmap: 0x00000000),
|
|
go->neg_pcompression, go->neg_accompression);
|
|
|
|
if (ho->neg_mru) {
|
|
peer_mru[f->unit] = ho->mru;
|
|
}
|
|
|
|
lcp_echo_lowerup(f->unit); /* Enable echo messages */
|
|
|
|
link_established(f->unit); /* The link is up; authenticate now */
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_down - LCP has gone DOWN.
|
|
*
|
|
* Alert other protocols.
|
|
*/
|
|
static void
|
|
lcp_down(fsm *f)
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
|
|
lcp_echo_lowerdown(f->unit);
|
|
|
|
link_down(f->unit);
|
|
|
|
ppp_send_config(f->unit, PPP_MRU, 0xffffffffl, 0, 0);
|
|
ppp_recv_config(f->unit, PPP_MRU,
|
|
(go->neg_asyncmap? go->asyncmap: 0x00000000),
|
|
go->neg_pcompression, go->neg_accompression);
|
|
peer_mru[f->unit] = PPP_MRU;
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_starting - LCP needs the lower layer up.
|
|
*/
|
|
static void
|
|
lcp_starting(fsm *f)
|
|
{
|
|
link_required(f->unit); /* lwip: currently does nothing */
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_finished - LCP has finished with the lower layer.
|
|
*/
|
|
static void
|
|
lcp_finished(fsm *f)
|
|
{
|
|
link_terminated(f->unit); /* we are finished with the link */
|
|
}
|
|
|
|
|
|
#if PPP_ADDITIONAL_CALLBACKS
|
|
/*
|
|
* print_string - print a readable representation of a string using
|
|
* printer.
|
|
*/
|
|
static void
|
|
print_string( char *p, int len, void (*printer) (void *, char *, ...), void *arg)
|
|
{
|
|
int c;
|
|
|
|
printer(arg, "\"");
|
|
for (; len > 0; --len) {
|
|
c = *p++;
|
|
if (' ' <= c && c <= '~') {
|
|
if (c == '\\' || c == '"') {
|
|
printer(arg, "\\");
|
|
}
|
|
printer(arg, "%c", c);
|
|
} else {
|
|
switch (c) {
|
|
case '\n':
|
|
printer(arg, "\\n");
|
|
break;
|
|
case '\r':
|
|
printer(arg, "\\r");
|
|
break;
|
|
case '\t':
|
|
printer(arg, "\\t");
|
|
break;
|
|
default:
|
|
printer(arg, "\\%.3o", c);
|
|
}
|
|
}
|
|
}
|
|
printer(arg, "\"");
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_printpkt - print the contents of an LCP packet.
|
|
*/
|
|
static char *lcp_codenames[] = {
|
|
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
|
|
"TermReq", "TermAck", "CodeRej", "ProtRej",
|
|
"EchoReq", "EchoRep", "DiscReq"
|
|
};
|
|
|
|
static int
|
|
lcp_printpkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
|
|
{
|
|
int code, id, len, olen;
|
|
u_char *pstart, *optend;
|
|
u_short cishort;
|
|
u32_t cilong;
|
|
|
|
if (plen < HEADERLEN) {
|
|
return 0;
|
|
}
|
|
pstart = p;
|
|
GETCHAR(code, p);
|
|
GETCHAR(id, p);
|
|
GETSHORT(len, p);
|
|
if (len < HEADERLEN || len > plen) {
|
|
return 0;
|
|
}
|
|
|
|
if (code >= 1 && code <= sizeof(lcp_codenames) / sizeof(char *)) {
|
|
printer(arg, " %s", lcp_codenames[code-1]);
|
|
} else {
|
|
printer(arg, " code=0x%x", code);
|
|
}
|
|
printer(arg, " id=0x%x", id);
|
|
len -= HEADERLEN;
|
|
switch (code) {
|
|
case CONFREQ:
|
|
case CONFACK:
|
|
case CONFNAK:
|
|
case CONFREJ:
|
|
/* print option list */
|
|
while (len >= 2) {
|
|
GETCHAR(code, p);
|
|
GETCHAR(olen, p);
|
|
p -= 2;
|
|
if (olen < 2 || olen > len) {
|
|
break;
|
|
}
|
|
printer(arg, " <");
|
|
len -= olen;
|
|
optend = p + olen;
|
|
switch (code) {
|
|
case CI_MRU:
|
|
if (olen == CILEN_SHORT) {
|
|
p += 2;
|
|
GETSHORT(cishort, p);
|
|
printer(arg, "mru %d", cishort);
|
|
}
|
|
break;
|
|
case CI_ASYNCMAP:
|
|
if (olen == CILEN_LONG) {
|
|
p += 2;
|
|
GETLONG(cilong, p);
|
|
printer(arg, "asyncmap 0x%lx", cilong);
|
|
}
|
|
break;
|
|
case CI_AUTHTYPE:
|
|
if (olen >= CILEN_SHORT) {
|
|
p += 2;
|
|
printer(arg, "auth ");
|
|
GETSHORT(cishort, p);
|
|
switch (cishort) {
|
|
case PPP_PAP:
|
|
printer(arg, "pap");
|
|
break;
|
|
case PPP_CHAP:
|
|
printer(arg, "chap");
|
|
break;
|
|
default:
|
|
printer(arg, "0x%x", cishort);
|
|
}
|
|
}
|
|
break;
|
|
case CI_QUALITY:
|
|
if (olen >= CILEN_SHORT) {
|
|
p += 2;
|
|
printer(arg, "quality ");
|
|
GETSHORT(cishort, p);
|
|
switch (cishort) {
|
|
case PPP_LQR:
|
|
printer(arg, "lqr");
|
|
break;
|
|
default:
|
|
printer(arg, "0x%x", cishort);
|
|
}
|
|
}
|
|
break;
|
|
case CI_CALLBACK:
|
|
if (olen >= CILEN_CHAR) {
|
|
p += 2;
|
|
printer(arg, "callback ");
|
|
GETSHORT(cishort, p);
|
|
switch (cishort) {
|
|
case CBCP_OPT:
|
|
printer(arg, "CBCP");
|
|
break;
|
|
default:
|
|
printer(arg, "0x%x", cishort);
|
|
}
|
|
}
|
|
break;
|
|
case CI_MAGICNUMBER:
|
|
if (olen == CILEN_LONG) {
|
|
p += 2;
|
|
GETLONG(cilong, p);
|
|
printer(arg, "magic 0x%x", cilong);
|
|
}
|
|
break;
|
|
case CI_PCOMPRESSION:
|
|
if (olen == CILEN_VOID) {
|
|
p += 2;
|
|
printer(arg, "pcomp");
|
|
}
|
|
break;
|
|
case CI_ACCOMPRESSION:
|
|
if (olen == CILEN_VOID) {
|
|
p += 2;
|
|
printer(arg, "accomp");
|
|
}
|
|
break;
|
|
}
|
|
while (p < optend) {
|
|
GETCHAR(code, p);
|
|
printer(arg, " %.2x", code);
|
|
}
|
|
printer(arg, ">");
|
|
}
|
|
break;
|
|
|
|
case TERMACK:
|
|
case TERMREQ:
|
|
if (len > 0 && *p >= ' ' && *p < 0x7f) {
|
|
printer(arg, " ");
|
|
print_string((char*)p, len, printer, arg);
|
|
p += len;
|
|
len = 0;
|
|
}
|
|
break;
|
|
|
|
case ECHOREQ:
|
|
case ECHOREP:
|
|
case DISCREQ:
|
|
if (len >= 4) {
|
|
GETLONG(cilong, p);
|
|
printer(arg, " magic=0x%x", cilong);
|
|
p += 4;
|
|
len -= 4;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* print the rest of the bytes in the packet */
|
|
for (; len > 0; --len) {
|
|
GETCHAR(code, p);
|
|
printer(arg, " %.2x", code);
|
|
}
|
|
|
|
return (int)(p - pstart);
|
|
}
|
|
#endif /* PPP_ADDITIONAL_CALLBACKS */
|
|
|
|
/*
|
|
* Time to shut down the link because there is nothing out there.
|
|
*/
|
|
static void
|
|
LcpLinkFailure (fsm *f)
|
|
{
|
|
if (f->state == LS_OPENED) {
|
|
LCPDEBUG(LOG_INFO, ("No response to %d echo-requests\n", lcp_echos_pending));
|
|
LCPDEBUG(LOG_NOTICE, ("Serial link appears to be disconnected.\n"));
|
|
lcp_close(f->unit, "Peer not responding");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Timer expired for the LCP echo requests from this process.
|
|
*/
|
|
static void
|
|
LcpEchoCheck (fsm *f)
|
|
{
|
|
LcpSendEchoRequest (f);
|
|
|
|
/*
|
|
* Start the timer for the next interval.
|
|
*/
|
|
LWIP_ASSERT("lcp_echo_timer_running == 0", lcp_echo_timer_running == 0);
|
|
|
|
TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval);
|
|
lcp_echo_timer_running = 1;
|
|
}
|
|
|
|
/*
|
|
* LcpEchoTimeout - Timer expired on the LCP echo
|
|
*/
|
|
static void
|
|
LcpEchoTimeout (void *arg)
|
|
{
|
|
if (lcp_echo_timer_running != 0) {
|
|
lcp_echo_timer_running = 0;
|
|
LcpEchoCheck ((fsm *) arg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* LcpEchoReply - LCP has received a reply to the echo
|
|
*/
|
|
static void
|
|
lcp_received_echo_reply (fsm *f, int id, u_char *inp, int len)
|
|
{
|
|
u32_t magic;
|
|
|
|
LWIP_UNUSED_ARG(id);
|
|
|
|
/* Check the magic number - don't count replies from ourselves. */
|
|
if (len < 4) {
|
|
LCPDEBUG(LOG_WARNING, ("lcp: received short Echo-Reply, length %d\n", len));
|
|
return;
|
|
}
|
|
GETLONG(magic, inp);
|
|
if (lcp_gotoptions[f->unit].neg_magicnumber && magic == lcp_gotoptions[f->unit].magicnumber) {
|
|
LCPDEBUG(LOG_WARNING, ("appear to have received our own echo-reply!\n"));
|
|
return;
|
|
}
|
|
|
|
/* Reset the number of outstanding echo frames */
|
|
lcp_echos_pending = 0;
|
|
}
|
|
|
|
/*
|
|
* LcpSendEchoRequest - Send an echo request frame to the peer
|
|
*/
|
|
static void
|
|
LcpSendEchoRequest (fsm *f)
|
|
{
|
|
u32_t lcp_magic;
|
|
u_char pkt[4], *pktp;
|
|
|
|
/*
|
|
* Detect the failure of the peer at this point.
|
|
*/
|
|
if (lcp_echo_fails != 0) {
|
|
if (lcp_echos_pending >= lcp_echo_fails) {
|
|
LcpLinkFailure(f);
|
|
lcp_echos_pending = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make and send the echo request frame.
|
|
*/
|
|
if (f->state == LS_OPENED) {
|
|
lcp_magic = lcp_gotoptions[f->unit].magicnumber;
|
|
pktp = pkt;
|
|
PUTLONG(lcp_magic, pktp);
|
|
fsm_sdata(f, ECHOREQ, (u_char)(lcp_echo_number++ & 0xFF), pkt, (int)(pktp - pkt));
|
|
++lcp_echos_pending;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* lcp_echo_lowerup - Start the timer for the LCP frame
|
|
*/
|
|
|
|
static void
|
|
lcp_echo_lowerup (int unit)
|
|
{
|
|
fsm *f = &lcp_fsm[unit];
|
|
|
|
/* Clear the parameters for generating echo frames */
|
|
lcp_echos_pending = 0;
|
|
lcp_echo_number = 0;
|
|
lcp_echo_timer_running = 0;
|
|
|
|
/* If a timeout interval is specified then start the timer */
|
|
if (lcp_echo_interval != 0) {
|
|
LcpEchoCheck (f);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* lcp_echo_lowerdown - Stop the timer for the LCP frame
|
|
*/
|
|
|
|
static void
|
|
lcp_echo_lowerdown (int unit)
|
|
{
|
|
fsm *f = &lcp_fsm[unit];
|
|
|
|
if (lcp_echo_timer_running != 0) {
|
|
UNTIMEOUT (LcpEchoTimeout, f);
|
|
lcp_echo_timer_running = 0;
|
|
}
|
|
}
|
|
|
|
#endif /* PPP_SUPPORT */
|