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jeremybenn |
/*****************************************************************************
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* lcp.c - Network Link Control 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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* 97-12-01 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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* lcp.c - PPP Link Control Protocol.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <string.h>
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#include "ppp.h"
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#if PPP_SUPPORT > 0
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#include "fsm.h"
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#include "chap.h"
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#include "magic.h"
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#include "auth.h"
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#include "lcp.h"
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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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* Length of each type of configuration option (in octets)
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*/
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#define CILEN_VOID 2
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#define CILEN_CHAR 3
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#define CILEN_SHORT 4 /* CILEN_VOID + sizeof(short) */
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#define CILEN_CHAP 5 /* CILEN_VOID + sizeof(short) + 1 */
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#define CILEN_LONG 6 /* CILEN_VOID + sizeof(long) */
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#define CILEN_LQR 8 /* CILEN_VOID + sizeof(short) + sizeof(long) */
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#define CILEN_CBCP 3
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/***********************************/
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/*** LOCAL FUNCTION DECLARATIONS ***/
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/***********************************/
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/*
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* Callbacks for fsm code. (CI = Configuration Information)
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*/
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static void lcp_resetci (fsm*); /* Reset our CI */
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static int lcp_cilen (fsm*); /* Return length of our CI */
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static void lcp_addci (fsm*, u_char*, int*); /* Add our CI to pkt */
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static int lcp_ackci (fsm*, u_char*, int);/* Peer ack'd our CI */
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static int lcp_nakci (fsm*, u_char*, int);/* Peer nak'd our CI */
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static int lcp_rejci (fsm*, u_char*, int);/* Peer rej'd our CI */
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static int lcp_reqci (fsm*, u_char*, int*, int); /* Rcv peer CI */
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static void lcp_up (fsm*); /* We're UP */
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static void lcp_down (fsm*); /* We're DOWN */
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static void lcp_starting (fsm*); /* We need lower layer up */
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static void lcp_finished (fsm*); /* We need lower layer down */
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static int lcp_extcode (fsm*, int, u_char, u_char*, int);
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static void lcp_rprotrej (fsm*, u_char*, int);
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/*
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* routines to send LCP echos to peer
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*/
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static void lcp_echo_lowerup (int);
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static void lcp_echo_lowerdown (int);
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static void LcpEchoTimeout (void*);
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static void lcp_received_echo_reply (fsm*, int, u_char*, int);
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static void LcpSendEchoRequest (fsm*);
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static void LcpLinkFailure (fsm*);
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static void LcpEchoCheck (fsm*);
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/*
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* Protocol entry points.
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* Some of these are called directly.
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*/
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static void lcp_input (int, u_char *, int);
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static void lcp_protrej (int);
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#define CODENAME(x) ((x) == CONFACK ? "ACK" : \
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(x) == CONFNAK ? "NAK" : "REJ")
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/******************************/
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/*** PUBLIC DATA STRUCTURES ***/
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/******************************/
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/* global vars */
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LinkPhase lcp_phase[NUM_PPP]; /* Phase of link session (RFC 1661) */
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lcp_options lcp_wantoptions[NUM_PPP]; /* Options that we want to request */
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lcp_options lcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
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lcp_options lcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
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lcp_options lcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
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ext_accm xmit_accm[NUM_PPP]; /* extended transmit ACCM */
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/*****************************/
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/*** LOCAL DATA STRUCTURES ***/
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/*****************************/
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static fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/
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static u_int lcp_echo_interval = LCP_ECHOINTERVAL; /* Interval between LCP echo-requests */
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static u_int lcp_echo_fails = LCP_MAXECHOFAILS; /* Tolerance to unanswered echo-requests */
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static u32_t lcp_echos_pending = 0; /* Number of outstanding echo msgs */
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static u32_t lcp_echo_number = 0; /* ID number of next echo frame */
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static u32_t lcp_echo_timer_running = 0; /* TRUE if a timer is running */
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static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
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static fsm_callbacks lcp_callbacks = { /* LCP callback routines */
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lcp_resetci, /* Reset our Configuration Information */
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lcp_cilen, /* Length of our Configuration Information */
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lcp_addci, /* Add our Configuration Information */
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lcp_ackci, /* ACK our Configuration Information */
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lcp_nakci, /* NAK our Configuration Information */
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lcp_rejci, /* Reject our Configuration Information */
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lcp_reqci, /* Request peer's Configuration Information */
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lcp_up, /* Called when fsm reaches OPENED state */
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lcp_down, /* Called when fsm leaves OPENED state */
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lcp_starting, /* Called when we want the lower layer up */
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lcp_finished, /* Called when we want the lower layer down */
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NULL, /* Called when Protocol-Reject received */
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NULL, /* Retransmission is necessary */
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lcp_extcode, /* Called to handle LCP-specific codes */
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"LCP" /* String name of protocol */
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};
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struct protent lcp_protent = {
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PPP_LCP,
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lcp_init,
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lcp_input,
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lcp_protrej,
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lcp_lowerup,
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lcp_lowerdown,
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lcp_open,
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lcp_close,
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#if 0
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lcp_printpkt,
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NULL,
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#endif
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1,
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"LCP",
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#if 0
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NULL,
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NULL,
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NULL
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#endif
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};
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int lcp_loopbackfail = DEFLOOPBACKFAIL;
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/***********************************/
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/*** PUBLIC FUNCTION DEFINITIONS ***/
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/***********************************/
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/*
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* lcp_init - Initialize LCP.
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*/
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void lcp_init(int unit)
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{
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fsm *f = &lcp_fsm[unit];
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lcp_options *wo = &lcp_wantoptions[unit];
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lcp_options *ao = &lcp_allowoptions[unit];
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f->unit = unit;
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f->protocol = PPP_LCP;
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f->callbacks = &lcp_callbacks;
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fsm_init(f);
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wo->passive = 0;
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wo->silent = 0;
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wo->restart = 0; /* Set to 1 in kernels or multi-line
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* implementations */
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wo->neg_mru = 1;
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wo->mru = PPP_DEFMRU;
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wo->neg_asyncmap = 1;
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wo->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
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wo->neg_chap = 0; /* Set to 1 on server */
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wo->neg_upap = 0; /* Set to 1 on server */
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wo->chap_mdtype = CHAP_DIGEST_MD5;
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wo->neg_magicnumber = 1;
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wo->neg_pcompression = 1;
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wo->neg_accompression = 1;
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wo->neg_lqr = 0; /* no LQR implementation yet */
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wo->neg_cbcp = 0;
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ao->neg_mru = 1;
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ao->mru = PPP_MAXMRU;
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ao->neg_asyncmap = 1;
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ao->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
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ao->neg_chap = (CHAP_SUPPORT != 0);
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ao->chap_mdtype = CHAP_DIGEST_MD5;
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ao->neg_upap = (PAP_SUPPORT != 0);
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ao->neg_magicnumber = 1;
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ao->neg_pcompression = 1;
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ao->neg_accompression = 1;
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ao->neg_lqr = 0; /* no LQR implementation yet */
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ao->neg_cbcp = (CBCP_SUPPORT != 0);
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/*
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* Set transmit escape for the flag and escape characters plus anything
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* set for the allowable options.
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*/
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memset(xmit_accm[unit], 0, sizeof(xmit_accm[0]));
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xmit_accm[unit][15] = 0x60;
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xmit_accm[unit][0] = (u_char)(ao->asyncmap & 0xFF);
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xmit_accm[unit][1] = (u_char)((ao->asyncmap >> 8) & 0xFF);
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xmit_accm[unit][2] = (u_char)((ao->asyncmap >> 16) & 0xFF);
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xmit_accm[unit][3] = (u_char)((ao->asyncmap >> 24) & 0xFF);
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LCPDEBUG((LOG_INFO, "lcp_init: xmit_accm=%X %X %X %X\n",
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xmit_accm[unit][0],
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xmit_accm[unit][1],
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xmit_accm[unit][2],
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xmit_accm[unit][3]));
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| 255 |
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| 256 |
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lcp_phase[unit] = PHASE_INITIALIZE;
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}
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| 259 |
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/*
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| 261 |
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* lcp_open - LCP is allowed to come up.
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| 262 |
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*/
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| 263 |
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void lcp_open(int unit)
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| 264 |
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{
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| 265 |
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fsm *f = &lcp_fsm[unit];
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| 266 |
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lcp_options *wo = &lcp_wantoptions[unit];
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| 267 |
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| 268 |
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f->flags = 0;
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| 269 |
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if (wo->passive)
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| 270 |
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f->flags |= OPT_PASSIVE;
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| 271 |
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if (wo->silent)
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| 272 |
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f->flags |= OPT_SILENT;
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| 273 |
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fsm_open(f);
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| 274 |
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| 275 |
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lcp_phase[unit] = PHASE_ESTABLISH;
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| 276 |
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}
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| 277 |
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| 278 |
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| 279 |
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/*
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| 280 |
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* lcp_close - Take LCP down.
|
| 281 |
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*/
|
| 282 |
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void lcp_close(int unit, char *reason)
|
| 283 |
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{
|
| 284 |
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fsm *f = &lcp_fsm[unit];
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| 285 |
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| 286 |
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if (lcp_phase[unit] != PHASE_DEAD)
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| 287 |
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lcp_phase[unit] = PHASE_TERMINATE;
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| 288 |
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if (f->state == STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
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| 289 |
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/*
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| 290 |
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* This action is not strictly according to the FSM in RFC1548,
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| 291 |
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* but it does mean that the program terminates if you do an
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| 292 |
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* lcp_close() in passive/silent mode when a connection hasn't
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| 293 |
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* been established.
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| 294 |
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*/
|
| 295 |
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f->state = CLOSED;
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| 296 |
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lcp_finished(f);
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| 297 |
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}
|
| 298 |
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else
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| 299 |
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fsm_close(&lcp_fsm[unit], reason);
|
| 300 |
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}
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| 301 |
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| 302 |
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| 303 |
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/*
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| 304 |
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* lcp_lowerup - The lower layer is up.
|
| 305 |
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*/
|
| 306 |
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void lcp_lowerup(int unit)
|
| 307 |
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{
|
| 308 |
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lcp_options *wo = &lcp_wantoptions[unit];
|
| 309 |
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| 310 |
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/*
|
| 311 |
|
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* Don't use A/C or protocol compression on transmission,
|
| 312 |
|
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* but accept A/C and protocol compressed packets
|
| 313 |
|
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* if we are going to ask for A/C and protocol compression.
|
| 314 |
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*/
|
| 315 |
|
|
ppp_set_xaccm(unit, &xmit_accm[unit]);
|
| 316 |
|
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ppp_send_config(unit, PPP_MRU, 0xffffffffl, 0, 0);
|
| 317 |
|
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ppp_recv_config(unit, PPP_MRU, 0x00000000l,
|
| 318 |
|
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wo->neg_pcompression, wo->neg_accompression);
|
| 319 |
|
|
peer_mru[unit] = PPP_MRU;
|
| 320 |
|
|
lcp_allowoptions[unit].asyncmap
|
| 321 |
|
|
= (u_long)xmit_accm[unit][0]
|
| 322 |
|
|
| ((u_long)xmit_accm[unit][1] << 8)
|
| 323 |
|
|
| ((u_long)xmit_accm[unit][2] << 16)
|
| 324 |
|
|
| ((u_long)xmit_accm[unit][3] << 24);
|
| 325 |
|
|
LCPDEBUG((LOG_INFO, "lcp_lowerup: asyncmap=%X %X %X %X\n",
|
| 326 |
|
|
xmit_accm[unit][3],
|
| 327 |
|
|
xmit_accm[unit][2],
|
| 328 |
|
|
xmit_accm[unit][1],
|
| 329 |
|
|
xmit_accm[unit][0]));
|
| 330 |
|
|
|
| 331 |
|
|
fsm_lowerup(&lcp_fsm[unit]);
|
| 332 |
|
|
}
|
| 333 |
|
|
|
| 334 |
|
|
|
| 335 |
|
|
/*
|
| 336 |
|
|
* lcp_lowerdown - The lower layer is down.
|
| 337 |
|
|
*/
|
| 338 |
|
|
void lcp_lowerdown(int unit)
|
| 339 |
|
|
{
|
| 340 |
|
|
fsm_lowerdown(&lcp_fsm[unit]);
|
| 341 |
|
|
}
|
| 342 |
|
|
|
| 343 |
|
|
/*
|
| 344 |
|
|
* lcp_sprotrej - Send a Protocol-Reject for some protocol.
|
| 345 |
|
|
*/
|
| 346 |
|
|
void lcp_sprotrej(int unit, u_char *p, int len)
|
| 347 |
|
|
{
|
| 348 |
|
|
/*
|
| 349 |
|
|
* Send back the protocol and the information field of the
|
| 350 |
|
|
* rejected packet. We only get here if LCP is in the OPENED state.
|
| 351 |
|
|
*/
|
| 352 |
|
|
|
| 353 |
|
|
fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id,
|
| 354 |
|
|
p, len);
|
| 355 |
|
|
}
|
| 356 |
|
|
|
| 357 |
|
|
|
| 358 |
|
|
|
| 359 |
|
|
/**********************************/
|
| 360 |
|
|
/*** LOCAL FUNCTION DEFINITIONS ***/
|
| 361 |
|
|
/**********************************/
|
| 362 |
|
|
/*
|
| 363 |
|
|
* lcp_input - Input LCP packet.
|
| 364 |
|
|
*/
|
| 365 |
|
|
static void lcp_input(int unit, u_char *p, int len)
|
| 366 |
|
|
{
|
| 367 |
|
|
fsm *f = &lcp_fsm[unit];
|
| 368 |
|
|
|
| 369 |
|
|
fsm_input(f, p, len);
|
| 370 |
|
|
}
|
| 371 |
|
|
|
| 372 |
|
|
|
| 373 |
|
|
/*
|
| 374 |
|
|
* lcp_extcode - Handle a LCP-specific code.
|
| 375 |
|
|
*/
|
| 376 |
|
|
static int lcp_extcode(fsm *f, int code, u_char id, u_char *inp, int len)
|
| 377 |
|
|
{
|
| 378 |
|
|
u_char *magp;
|
| 379 |
|
|
|
| 380 |
|
|
switch( code ){
|
| 381 |
|
|
case PROTREJ:
|
| 382 |
|
|
lcp_rprotrej(f, inp, len);
|
| 383 |
|
|
break;
|
| 384 |
|
|
|
| 385 |
|
|
case ECHOREQ:
|
| 386 |
|
|
if (f->state != OPENED)
|
| 387 |
|
|
break;
|
| 388 |
|
|
LCPDEBUG((LOG_INFO, "lcp: Echo-Request, Rcvd id %d\n", id));
|
| 389 |
|
|
magp = inp;
|
| 390 |
|
|
PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
|
| 391 |
|
|
fsm_sdata(f, ECHOREP, id, inp, len);
|
| 392 |
|
|
break;
|
| 393 |
|
|
|
| 394 |
|
|
case ECHOREP:
|
| 395 |
|
|
lcp_received_echo_reply(f, id, inp, len);
|
| 396 |
|
|
break;
|
| 397 |
|
|
|
| 398 |
|
|
case DISCREQ:
|
| 399 |
|
|
break;
|
| 400 |
|
|
|
| 401 |
|
|
default:
|
| 402 |
|
|
return 0;
|
| 403 |
|
|
}
|
| 404 |
|
|
return 1;
|
| 405 |
|
|
}
|
| 406 |
|
|
|
| 407 |
|
|
|
| 408 |
|
|
/*
|
| 409 |
|
|
* lcp_rprotrej - Receive an Protocol-Reject.
|
| 410 |
|
|
*
|
| 411 |
|
|
* Figure out which protocol is rejected and inform it.
|
| 412 |
|
|
*/
|
| 413 |
|
|
static void lcp_rprotrej(fsm *f, u_char *inp, int len)
|
| 414 |
|
|
{
|
| 415 |
|
|
int i;
|
| 416 |
|
|
struct protent *protp;
|
| 417 |
|
|
u_short prot;
|
| 418 |
|
|
|
| 419 |
|
|
if (len < sizeof (u_short)) {
|
| 420 |
|
|
LCPDEBUG((LOG_INFO,
|
| 421 |
|
|
"lcp_rprotrej: Rcvd short Protocol-Reject packet!\n"));
|
| 422 |
|
|
return;
|
| 423 |
|
|
}
|
| 424 |
|
|
|
| 425 |
|
|
GETSHORT(prot, inp);
|
| 426 |
|
|
|
| 427 |
|
|
LCPDEBUG((LOG_INFO,
|
| 428 |
|
|
"lcp_rprotrej: Rcvd Protocol-Reject packet for %x!\n",
|
| 429 |
|
|
prot));
|
| 430 |
|
|
|
| 431 |
|
|
/*
|
| 432 |
|
|
* Protocol-Reject packets received in any state other than the LCP
|
| 433 |
|
|
* OPENED state SHOULD be silently discarded.
|
| 434 |
|
|
*/
|
| 435 |
|
|
if( f->state != OPENED ){
|
| 436 |
|
|
LCPDEBUG((LOG_INFO, "Protocol-Reject discarded: LCP in state %d\n",
|
| 437 |
|
|
f->state));
|
| 438 |
|
|
return;
|
| 439 |
|
|
}
|
| 440 |
|
|
|
| 441 |
|
|
/*
|
| 442 |
|
|
* Upcall the proper Protocol-Reject routine.
|
| 443 |
|
|
*/
|
| 444 |
|
|
for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i)
|
| 445 |
|
|
if (protp->protocol == prot && protp->enabled_flag) {
|
| 446 |
|
|
(*protp->protrej)(f->unit);
|
| 447 |
|
|
return;
|
| 448 |
|
|
}
|
| 449 |
|
|
|
| 450 |
|
|
LCPDEBUG((LOG_WARNING, "Protocol-Reject for unsupported protocol 0x%x\n",
|
| 451 |
|
|
prot));
|
| 452 |
|
|
}
|
| 453 |
|
|
|
| 454 |
|
|
|
| 455 |
|
|
/*
|
| 456 |
|
|
* lcp_protrej - A Protocol-Reject was received.
|
| 457 |
|
|
*/
|
| 458 |
|
|
static void lcp_protrej(int unit)
|
| 459 |
|
|
{
|
| 460 |
|
|
(void)unit;
|
| 461 |
|
|
/*
|
| 462 |
|
|
* Can't reject LCP!
|
| 463 |
|
|
*/
|
| 464 |
|
|
LCPDEBUG((LOG_WARNING,
|
| 465 |
|
|
"lcp_protrej: Received Protocol-Reject for LCP!\n"));
|
| 466 |
|
|
fsm_protreject(&lcp_fsm[unit]);
|
| 467 |
|
|
}
|
| 468 |
|
|
|
| 469 |
|
|
|
| 470 |
|
|
/*
|
| 471 |
|
|
* lcp_resetci - Reset our CI.
|
| 472 |
|
|
*/
|
| 473 |
|
|
static void lcp_resetci(fsm *f)
|
| 474 |
|
|
{
|
| 475 |
|
|
lcp_wantoptions[f->unit].magicnumber = magic();
|
| 476 |
|
|
lcp_wantoptions[f->unit].numloops = 0;
|
| 477 |
|
|
lcp_gotoptions[f->unit] = lcp_wantoptions[f->unit];
|
| 478 |
|
|
peer_mru[f->unit] = PPP_MRU;
|
| 479 |
|
|
auth_reset(f->unit);
|
| 480 |
|
|
}
|
| 481 |
|
|
|
| 482 |
|
|
|
| 483 |
|
|
/*
|
| 484 |
|
|
* lcp_cilen - Return length of our CI.
|
| 485 |
|
|
*/
|
| 486 |
|
|
static int lcp_cilen(fsm *f)
|
| 487 |
|
|
{
|
| 488 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 489 |
|
|
|
| 490 |
|
|
#define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
|
| 491 |
|
|
#define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
|
| 492 |
|
|
#define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
|
| 493 |
|
|
#define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
|
| 494 |
|
|
#define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
|
| 495 |
|
|
#define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
|
| 496 |
|
|
/*
|
| 497 |
|
|
* NB: we only ask for one of CHAP and UPAP, even if we will
|
| 498 |
|
|
* accept either.
|
| 499 |
|
|
*/
|
| 500 |
|
|
return (LENCISHORT(go->neg_mru && go->mru != PPP_DEFMRU) +
|
| 501 |
|
|
LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) +
|
| 502 |
|
|
LENCICHAP(go->neg_chap) +
|
| 503 |
|
|
LENCISHORT(!go->neg_chap && go->neg_upap) +
|
| 504 |
|
|
LENCILQR(go->neg_lqr) +
|
| 505 |
|
|
LENCICBCP(go->neg_cbcp) +
|
| 506 |
|
|
LENCILONG(go->neg_magicnumber) +
|
| 507 |
|
|
LENCIVOID(go->neg_pcompression) +
|
| 508 |
|
|
LENCIVOID(go->neg_accompression));
|
| 509 |
|
|
}
|
| 510 |
|
|
|
| 511 |
|
|
|
| 512 |
|
|
/*
|
| 513 |
|
|
* lcp_addci - Add our desired CIs to a packet.
|
| 514 |
|
|
*/
|
| 515 |
|
|
static void lcp_addci(fsm *f, u_char *ucp, int *lenp)
|
| 516 |
|
|
{
|
| 517 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 518 |
|
|
u_char *start_ucp = ucp;
|
| 519 |
|
|
|
| 520 |
|
|
#define ADDCIVOID(opt, neg) \
|
| 521 |
|
|
if (neg) { \
|
| 522 |
|
|
LCPDEBUG((LOG_INFO, "lcp_addci: opt=%d\n", opt)); \
|
| 523 |
|
|
PUTCHAR(opt, ucp); \
|
| 524 |
|
|
PUTCHAR(CILEN_VOID, ucp); \
|
| 525 |
|
|
}
|
| 526 |
|
|
#define ADDCISHORT(opt, neg, val) \
|
| 527 |
|
|
if (neg) { \
|
| 528 |
|
|
LCPDEBUG((LOG_INFO, "lcp_addci: INT opt=%d %X\n", opt, val)); \
|
| 529 |
|
|
PUTCHAR(opt, ucp); \
|
| 530 |
|
|
PUTCHAR(CILEN_SHORT, ucp); \
|
| 531 |
|
|
PUTSHORT(val, ucp); \
|
| 532 |
|
|
}
|
| 533 |
|
|
#define ADDCICHAP(opt, neg, val, digest) \
|
| 534 |
|
|
if (neg) { \
|
| 535 |
|
|
LCPDEBUG((LOG_INFO, "lcp_addci: CHAP opt=%d %X\n", opt, val)); \
|
| 536 |
|
|
PUTCHAR(opt, ucp); \
|
| 537 |
|
|
PUTCHAR(CILEN_CHAP, ucp); \
|
| 538 |
|
|
PUTSHORT(val, ucp); \
|
| 539 |
|
|
PUTCHAR(digest, ucp); \
|
| 540 |
|
|
}
|
| 541 |
|
|
#define ADDCILONG(opt, neg, val) \
|
| 542 |
|
|
if (neg) { \
|
| 543 |
|
|
LCPDEBUG((LOG_INFO, "lcp_addci: L opt=%d %lX\n", opt, val)); \
|
| 544 |
|
|
PUTCHAR(opt, ucp); \
|
| 545 |
|
|
PUTCHAR(CILEN_LONG, ucp); \
|
| 546 |
|
|
PUTLONG(val, ucp); \
|
| 547 |
|
|
}
|
| 548 |
|
|
#define ADDCILQR(opt, neg, val) \
|
| 549 |
|
|
if (neg) { \
|
| 550 |
|
|
LCPDEBUG((LOG_INFO, "lcp_addci: LQR opt=%d %lX\n", opt, val)); \
|
| 551 |
|
|
PUTCHAR(opt, ucp); \
|
| 552 |
|
|
PUTCHAR(CILEN_LQR, ucp); \
|
| 553 |
|
|
PUTSHORT(PPP_LQR, ucp); \
|
| 554 |
|
|
PUTLONG(val, ucp); \
|
| 555 |
|
|
}
|
| 556 |
|
|
#define ADDCICHAR(opt, neg, val) \
|
| 557 |
|
|
if (neg) { \
|
| 558 |
|
|
LCPDEBUG((LOG_INFO, "lcp_addci: CHAR opt=%d %X '%z'\n", opt, val, val)); \
|
| 559 |
|
|
PUTCHAR(opt, ucp); \
|
| 560 |
|
|
PUTCHAR(CILEN_CHAR, ucp); \
|
| 561 |
|
|
PUTCHAR(val, ucp); \
|
| 562 |
|
|
}
|
| 563 |
|
|
|
| 564 |
|
|
ADDCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
|
| 565 |
|
|
ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl,
|
| 566 |
|
|
go->asyncmap);
|
| 567 |
|
|
ADDCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
|
| 568 |
|
|
ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
|
| 569 |
|
|
ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
|
| 570 |
|
|
ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
|
| 571 |
|
|
ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
|
| 572 |
|
|
ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
|
| 573 |
|
|
ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
|
| 574 |
|
|
|
| 575 |
|
|
if (ucp - start_ucp != *lenp) {
|
| 576 |
|
|
/* this should never happen, because peer_mtu should be 1500 */
|
| 577 |
|
|
LCPDEBUG((LOG_ERR, "Bug in lcp_addci: wrong length\n"));
|
| 578 |
|
|
}
|
| 579 |
|
|
}
|
| 580 |
|
|
|
| 581 |
|
|
|
| 582 |
|
|
/*
|
| 583 |
|
|
* lcp_ackci - Ack our CIs.
|
| 584 |
|
|
* This should not modify any state if the Ack is bad.
|
| 585 |
|
|
*
|
| 586 |
|
|
* Returns:
|
| 587 |
|
|
* 0 - Ack was bad.
|
| 588 |
|
|
* 1 - Ack was good.
|
| 589 |
|
|
*/
|
| 590 |
|
|
static int lcp_ackci(fsm *f, u_char *p, int len)
|
| 591 |
|
|
{
|
| 592 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 593 |
|
|
u_char cilen, citype, cichar;
|
| 594 |
|
|
u_short cishort;
|
| 595 |
|
|
u32_t cilong;
|
| 596 |
|
|
|
| 597 |
|
|
/*
|
| 598 |
|
|
* CIs must be in exactly the same order that we sent.
|
| 599 |
|
|
* Check packet length and CI length at each step.
|
| 600 |
|
|
* If we find any deviations, then this packet is bad.
|
| 601 |
|
|
*/
|
| 602 |
|
|
#define ACKCIVOID(opt, neg) \
|
| 603 |
|
|
if (neg) { \
|
| 604 |
|
|
if ((len -= CILEN_VOID) < 0) \
|
| 605 |
|
|
goto bad; \
|
| 606 |
|
|
GETCHAR(citype, p); \
|
| 607 |
|
|
GETCHAR(cilen, p); \
|
| 608 |
|
|
if (cilen != CILEN_VOID || \
|
| 609 |
|
|
citype != opt) \
|
| 610 |
|
|
goto bad; \
|
| 611 |
|
|
}
|
| 612 |
|
|
#define ACKCISHORT(opt, neg, val) \
|
| 613 |
|
|
if (neg) { \
|
| 614 |
|
|
if ((len -= CILEN_SHORT) < 0) \
|
| 615 |
|
|
goto bad; \
|
| 616 |
|
|
GETCHAR(citype, p); \
|
| 617 |
|
|
GETCHAR(cilen, p); \
|
| 618 |
|
|
if (cilen != CILEN_SHORT || \
|
| 619 |
|
|
citype != opt) \
|
| 620 |
|
|
goto bad; \
|
| 621 |
|
|
GETSHORT(cishort, p); \
|
| 622 |
|
|
if (cishort != val) \
|
| 623 |
|
|
goto bad; \
|
| 624 |
|
|
}
|
| 625 |
|
|
#define ACKCICHAR(opt, neg, val) \
|
| 626 |
|
|
if (neg) { \
|
| 627 |
|
|
if ((len -= CILEN_CHAR) < 0) \
|
| 628 |
|
|
goto bad; \
|
| 629 |
|
|
GETCHAR(citype, p); \
|
| 630 |
|
|
GETCHAR(cilen, p); \
|
| 631 |
|
|
if (cilen != CILEN_CHAR || \
|
| 632 |
|
|
citype != opt) \
|
| 633 |
|
|
goto bad; \
|
| 634 |
|
|
GETCHAR(cichar, p); \
|
| 635 |
|
|
if (cichar != val) \
|
| 636 |
|
|
goto bad; \
|
| 637 |
|
|
}
|
| 638 |
|
|
#define ACKCICHAP(opt, neg, val, digest) \
|
| 639 |
|
|
if (neg) { \
|
| 640 |
|
|
if ((len -= CILEN_CHAP) < 0) \
|
| 641 |
|
|
goto bad; \
|
| 642 |
|
|
GETCHAR(citype, p); \
|
| 643 |
|
|
GETCHAR(cilen, p); \
|
| 644 |
|
|
if (cilen != CILEN_CHAP || \
|
| 645 |
|
|
citype != opt) \
|
| 646 |
|
|
goto bad; \
|
| 647 |
|
|
GETSHORT(cishort, p); \
|
| 648 |
|
|
if (cishort != val) \
|
| 649 |
|
|
goto bad; \
|
| 650 |
|
|
GETCHAR(cichar, p); \
|
| 651 |
|
|
if (cichar != digest) \
|
| 652 |
|
|
goto bad; \
|
| 653 |
|
|
}
|
| 654 |
|
|
#define ACKCILONG(opt, neg, val) \
|
| 655 |
|
|
if (neg) { \
|
| 656 |
|
|
if ((len -= CILEN_LONG) < 0) \
|
| 657 |
|
|
goto bad; \
|
| 658 |
|
|
GETCHAR(citype, p); \
|
| 659 |
|
|
GETCHAR(cilen, p); \
|
| 660 |
|
|
if (cilen != CILEN_LONG || \
|
| 661 |
|
|
citype != opt) \
|
| 662 |
|
|
goto bad; \
|
| 663 |
|
|
GETLONG(cilong, p); \
|
| 664 |
|
|
if (cilong != val) \
|
| 665 |
|
|
goto bad; \
|
| 666 |
|
|
}
|
| 667 |
|
|
#define ACKCILQR(opt, neg, val) \
|
| 668 |
|
|
if (neg) { \
|
| 669 |
|
|
if ((len -= CILEN_LQR) < 0) \
|
| 670 |
|
|
goto bad; \
|
| 671 |
|
|
GETCHAR(citype, p); \
|
| 672 |
|
|
GETCHAR(cilen, p); \
|
| 673 |
|
|
if (cilen != CILEN_LQR || \
|
| 674 |
|
|
citype != opt) \
|
| 675 |
|
|
goto bad; \
|
| 676 |
|
|
GETSHORT(cishort, p); \
|
| 677 |
|
|
if (cishort != PPP_LQR) \
|
| 678 |
|
|
goto bad; \
|
| 679 |
|
|
GETLONG(cilong, p); \
|
| 680 |
|
|
if (cilong != val) \
|
| 681 |
|
|
goto bad; \
|
| 682 |
|
|
}
|
| 683 |
|
|
|
| 684 |
|
|
ACKCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
|
| 685 |
|
|
ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl,
|
| 686 |
|
|
go->asyncmap);
|
| 687 |
|
|
ACKCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
|
| 688 |
|
|
ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
|
| 689 |
|
|
ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
|
| 690 |
|
|
ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
|
| 691 |
|
|
ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
|
| 692 |
|
|
ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
|
| 693 |
|
|
ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
|
| 694 |
|
|
|
| 695 |
|
|
/*
|
| 696 |
|
|
* If there are any remaining CIs, then this packet is bad.
|
| 697 |
|
|
*/
|
| 698 |
|
|
if (len != 0)
|
| 699 |
|
|
goto bad;
|
| 700 |
|
|
LCPDEBUG((LOG_INFO, "lcp_acki: Ack\n"));
|
| 701 |
|
|
return (1);
|
| 702 |
|
|
bad:
|
| 703 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_acki: received bad Ack!\n"));
|
| 704 |
|
|
return (0);
|
| 705 |
|
|
}
|
| 706 |
|
|
|
| 707 |
|
|
|
| 708 |
|
|
/*
|
| 709 |
|
|
* lcp_nakci - Peer has sent a NAK for some of our CIs.
|
| 710 |
|
|
* This should not modify any state if the Nak is bad
|
| 711 |
|
|
* or if LCP is in the OPENED state.
|
| 712 |
|
|
*
|
| 713 |
|
|
* Returns:
|
| 714 |
|
|
* 0 - Nak was bad.
|
| 715 |
|
|
* 1 - Nak was good.
|
| 716 |
|
|
*/
|
| 717 |
|
|
static int lcp_nakci(fsm *f, u_char *p, int len)
|
| 718 |
|
|
{
|
| 719 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 720 |
|
|
lcp_options *wo = &lcp_wantoptions[f->unit];
|
| 721 |
|
|
u_char citype, cichar, *next;
|
| 722 |
|
|
u_short cishort;
|
| 723 |
|
|
u32_t cilong;
|
| 724 |
|
|
lcp_options no; /* options we've seen Naks for */
|
| 725 |
|
|
lcp_options try; /* options to request next time */
|
| 726 |
|
|
int looped_back = 0;
|
| 727 |
|
|
int cilen;
|
| 728 |
|
|
|
| 729 |
|
|
BZERO(&no, sizeof(no));
|
| 730 |
|
|
try = *go;
|
| 731 |
|
|
|
| 732 |
|
|
/*
|
| 733 |
|
|
* Any Nak'd CIs must be in exactly the same order that we sent.
|
| 734 |
|
|
* Check packet length and CI length at each step.
|
| 735 |
|
|
* If we find any deviations, then this packet is bad.
|
| 736 |
|
|
*/
|
| 737 |
|
|
#define NAKCIVOID(opt, neg, code) \
|
| 738 |
|
|
if (go->neg && \
|
| 739 |
|
|
len >= CILEN_VOID && \
|
| 740 |
|
|
p[1] == CILEN_VOID && \
|
| 741 |
|
|
p[0] == opt) { \
|
| 742 |
|
|
len -= CILEN_VOID; \
|
| 743 |
|
|
INCPTR(CILEN_VOID, p); \
|
| 744 |
|
|
no.neg = 1; \
|
| 745 |
|
|
code \
|
| 746 |
|
|
}
|
| 747 |
|
|
#define NAKCICHAP(opt, neg, code) \
|
| 748 |
|
|
if (go->neg && \
|
| 749 |
|
|
len >= CILEN_CHAP && \
|
| 750 |
|
|
p[1] == CILEN_CHAP && \
|
| 751 |
|
|
p[0] == opt) { \
|
| 752 |
|
|
len -= CILEN_CHAP; \
|
| 753 |
|
|
INCPTR(2, p); \
|
| 754 |
|
|
GETSHORT(cishort, p); \
|
| 755 |
|
|
GETCHAR(cichar, p); \
|
| 756 |
|
|
no.neg = 1; \
|
| 757 |
|
|
code \
|
| 758 |
|
|
}
|
| 759 |
|
|
#define NAKCICHAR(opt, neg, code) \
|
| 760 |
|
|
if (go->neg && \
|
| 761 |
|
|
len >= CILEN_CHAR && \
|
| 762 |
|
|
p[1] == CILEN_CHAR && \
|
| 763 |
|
|
p[0] == opt) { \
|
| 764 |
|
|
len -= CILEN_CHAR; \
|
| 765 |
|
|
INCPTR(2, p); \
|
| 766 |
|
|
GETCHAR(cichar, p); \
|
| 767 |
|
|
no.neg = 1; \
|
| 768 |
|
|
code \
|
| 769 |
|
|
}
|
| 770 |
|
|
#define NAKCISHORT(opt, neg, code) \
|
| 771 |
|
|
if (go->neg && \
|
| 772 |
|
|
len >= CILEN_SHORT && \
|
| 773 |
|
|
p[1] == CILEN_SHORT && \
|
| 774 |
|
|
p[0] == opt) { \
|
| 775 |
|
|
len -= CILEN_SHORT; \
|
| 776 |
|
|
INCPTR(2, p); \
|
| 777 |
|
|
GETSHORT(cishort, p); \
|
| 778 |
|
|
no.neg = 1; \
|
| 779 |
|
|
code \
|
| 780 |
|
|
}
|
| 781 |
|
|
#define NAKCILONG(opt, neg, code) \
|
| 782 |
|
|
if (go->neg && \
|
| 783 |
|
|
len >= CILEN_LONG && \
|
| 784 |
|
|
p[1] == CILEN_LONG && \
|
| 785 |
|
|
p[0] == opt) { \
|
| 786 |
|
|
len -= CILEN_LONG; \
|
| 787 |
|
|
INCPTR(2, p); \
|
| 788 |
|
|
GETLONG(cilong, p); \
|
| 789 |
|
|
no.neg = 1; \
|
| 790 |
|
|
code \
|
| 791 |
|
|
}
|
| 792 |
|
|
#define NAKCILQR(opt, neg, code) \
|
| 793 |
|
|
if (go->neg && \
|
| 794 |
|
|
len >= CILEN_LQR && \
|
| 795 |
|
|
p[1] == CILEN_LQR && \
|
| 796 |
|
|
p[0] == opt) { \
|
| 797 |
|
|
len -= CILEN_LQR; \
|
| 798 |
|
|
INCPTR(2, p); \
|
| 799 |
|
|
GETSHORT(cishort, p); \
|
| 800 |
|
|
GETLONG(cilong, p); \
|
| 801 |
|
|
no.neg = 1; \
|
| 802 |
|
|
code \
|
| 803 |
|
|
}
|
| 804 |
|
|
|
| 805 |
|
|
/*
|
| 806 |
|
|
* We don't care if they want to send us smaller packets than
|
| 807 |
|
|
* we want. Therefore, accept any MRU less than what we asked for,
|
| 808 |
|
|
* but then ignore the new value when setting the MRU in the kernel.
|
| 809 |
|
|
* If they send us a bigger MRU than what we asked, accept it, up to
|
| 810 |
|
|
* the limit of the default MRU we'd get if we didn't negotiate.
|
| 811 |
|
|
*/
|
| 812 |
|
|
if (go->neg_mru && go->mru != PPP_DEFMRU) {
|
| 813 |
|
|
NAKCISHORT(CI_MRU, neg_mru,
|
| 814 |
|
|
if (cishort <= wo->mru || cishort < PPP_DEFMRU)
|
| 815 |
|
|
try.mru = cishort;
|
| 816 |
|
|
);
|
| 817 |
|
|
}
|
| 818 |
|
|
|
| 819 |
|
|
/*
|
| 820 |
|
|
* Add any characters they want to our (receive-side) asyncmap.
|
| 821 |
|
|
*/
|
| 822 |
|
|
if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) {
|
| 823 |
|
|
NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
|
| 824 |
|
|
try.asyncmap = go->asyncmap | cilong;
|
| 825 |
|
|
);
|
| 826 |
|
|
}
|
| 827 |
|
|
|
| 828 |
|
|
/*
|
| 829 |
|
|
* If they've nak'd our authentication-protocol, check whether
|
| 830 |
|
|
* they are proposing a different protocol, or a different
|
| 831 |
|
|
* hash algorithm for CHAP.
|
| 832 |
|
|
*/
|
| 833 |
|
|
if ((go->neg_chap || go->neg_upap)
|
| 834 |
|
|
&& len >= CILEN_SHORT
|
| 835 |
|
|
&& p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
|
| 836 |
|
|
cilen = p[1];
|
| 837 |
|
|
len -= cilen;
|
| 838 |
|
|
no.neg_chap = go->neg_chap;
|
| 839 |
|
|
no.neg_upap = go->neg_upap;
|
| 840 |
|
|
INCPTR(2, p);
|
| 841 |
|
|
GETSHORT(cishort, p);
|
| 842 |
|
|
if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
|
| 843 |
|
|
/*
|
| 844 |
|
|
* If we were asking for CHAP, they obviously don't want to do it.
|
| 845 |
|
|
* If we weren't asking for CHAP, then we were asking for PAP,
|
| 846 |
|
|
* in which case this Nak is bad.
|
| 847 |
|
|
*/
|
| 848 |
|
|
if (!go->neg_chap)
|
| 849 |
|
|
goto bad;
|
| 850 |
|
|
try.neg_chap = 0;
|
| 851 |
|
|
|
| 852 |
|
|
} else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
|
| 853 |
|
|
GETCHAR(cichar, p);
|
| 854 |
|
|
if (go->neg_chap) {
|
| 855 |
|
|
/*
|
| 856 |
|
|
* We were asking for CHAP/MD5; they must want a different
|
| 857 |
|
|
* algorithm. If they can't do MD5, we'll have to stop
|
| 858 |
|
|
* asking for CHAP.
|
| 859 |
|
|
*/
|
| 860 |
|
|
if (cichar != go->chap_mdtype)
|
| 861 |
|
|
try.neg_chap = 0;
|
| 862 |
|
|
} else {
|
| 863 |
|
|
/*
|
| 864 |
|
|
* Stop asking for PAP if we were asking for it.
|
| 865 |
|
|
*/
|
| 866 |
|
|
try.neg_upap = 0;
|
| 867 |
|
|
}
|
| 868 |
|
|
|
| 869 |
|
|
} else {
|
| 870 |
|
|
/*
|
| 871 |
|
|
* We don't recognize what they're suggesting.
|
| 872 |
|
|
* Stop asking for what we were asking for.
|
| 873 |
|
|
*/
|
| 874 |
|
|
if (go->neg_chap)
|
| 875 |
|
|
try.neg_chap = 0;
|
| 876 |
|
|
else
|
| 877 |
|
|
try.neg_upap = 0;
|
| 878 |
|
|
p += cilen - CILEN_SHORT;
|
| 879 |
|
|
}
|
| 880 |
|
|
}
|
| 881 |
|
|
|
| 882 |
|
|
/*
|
| 883 |
|
|
* If they can't cope with our link quality protocol, we'll have
|
| 884 |
|
|
* to stop asking for LQR. We haven't got any other protocol.
|
| 885 |
|
|
* If they Nak the reporting period, take their value XXX ?
|
| 886 |
|
|
*/
|
| 887 |
|
|
NAKCILQR(CI_QUALITY, neg_lqr,
|
| 888 |
|
|
if (cishort != PPP_LQR)
|
| 889 |
|
|
try.neg_lqr = 0;
|
| 890 |
|
|
else
|
| 891 |
|
|
try.lqr_period = cilong;
|
| 892 |
|
|
);
|
| 893 |
|
|
|
| 894 |
|
|
/*
|
| 895 |
|
|
* Only implementing CBCP...not the rest of the callback options
|
| 896 |
|
|
*/
|
| 897 |
|
|
NAKCICHAR(CI_CALLBACK, neg_cbcp,
|
| 898 |
|
|
try.neg_cbcp = 0;
|
| 899 |
|
|
);
|
| 900 |
|
|
|
| 901 |
|
|
/*
|
| 902 |
|
|
* Check for a looped-back line.
|
| 903 |
|
|
*/
|
| 904 |
|
|
NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
|
| 905 |
|
|
try.magicnumber = magic();
|
| 906 |
|
|
looped_back = 1;
|
| 907 |
|
|
);
|
| 908 |
|
|
|
| 909 |
|
|
/*
|
| 910 |
|
|
* Peer shouldn't send Nak for protocol compression or
|
| 911 |
|
|
* address/control compression requests; they should send
|
| 912 |
|
|
* a Reject instead. If they send a Nak, treat it as a Reject.
|
| 913 |
|
|
*/
|
| 914 |
|
|
NAKCIVOID(CI_PCOMPRESSION, neg_pcompression,
|
| 915 |
|
|
try.neg_pcompression = 0;
|
| 916 |
|
|
);
|
| 917 |
|
|
NAKCIVOID(CI_ACCOMPRESSION, neg_accompression,
|
| 918 |
|
|
try.neg_accompression = 0;
|
| 919 |
|
|
);
|
| 920 |
|
|
|
| 921 |
|
|
/*
|
| 922 |
|
|
* There may be remaining CIs, if the peer is requesting negotiation
|
| 923 |
|
|
* on an option that we didn't include in our request packet.
|
| 924 |
|
|
* If we see an option that we requested, or one we've already seen
|
| 925 |
|
|
* in this packet, then this packet is bad.
|
| 926 |
|
|
* If we wanted to respond by starting to negotiate on the requested
|
| 927 |
|
|
* option(s), we could, but we don't, because except for the
|
| 928 |
|
|
* authentication type and quality protocol, if we are not negotiating
|
| 929 |
|
|
* an option, it is because we were told not to.
|
| 930 |
|
|
* For the authentication type, the Nak from the peer means
|
| 931 |
|
|
* `let me authenticate myself with you' which is a bit pointless.
|
| 932 |
|
|
* For the quality protocol, the Nak means `ask me to send you quality
|
| 933 |
|
|
* reports', but if we didn't ask for them, we don't want them.
|
| 934 |
|
|
* An option we don't recognize represents the peer asking to
|
| 935 |
|
|
* negotiate some option we don't support, so ignore it.
|
| 936 |
|
|
*/
|
| 937 |
|
|
while (len > CILEN_VOID) {
|
| 938 |
|
|
GETCHAR(citype, p);
|
| 939 |
|
|
GETCHAR(cilen, p);
|
| 940 |
|
|
if (cilen < CILEN_VOID || (len -= cilen) < 0)
|
| 941 |
|
|
goto bad;
|
| 942 |
|
|
next = p + cilen - 2;
|
| 943 |
|
|
|
| 944 |
|
|
switch (citype) {
|
| 945 |
|
|
case CI_MRU:
|
| 946 |
|
|
if ((go->neg_mru && go->mru != PPP_DEFMRU)
|
| 947 |
|
|
|| no.neg_mru || cilen != CILEN_SHORT)
|
| 948 |
|
|
goto bad;
|
| 949 |
|
|
GETSHORT(cishort, p);
|
| 950 |
|
|
if (cishort < PPP_DEFMRU)
|
| 951 |
|
|
try.mru = cishort;
|
| 952 |
|
|
break;
|
| 953 |
|
|
case CI_ASYNCMAP:
|
| 954 |
|
|
if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl)
|
| 955 |
|
|
|| no.neg_asyncmap || cilen != CILEN_LONG)
|
| 956 |
|
|
goto bad;
|
| 957 |
|
|
break;
|
| 958 |
|
|
case CI_AUTHTYPE:
|
| 959 |
|
|
if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap)
|
| 960 |
|
|
goto bad;
|
| 961 |
|
|
break;
|
| 962 |
|
|
case CI_MAGICNUMBER:
|
| 963 |
|
|
if (go->neg_magicnumber || no.neg_magicnumber ||
|
| 964 |
|
|
cilen != CILEN_LONG)
|
| 965 |
|
|
goto bad;
|
| 966 |
|
|
break;
|
| 967 |
|
|
case CI_PCOMPRESSION:
|
| 968 |
|
|
if (go->neg_pcompression || no.neg_pcompression
|
| 969 |
|
|
|| cilen != CILEN_VOID)
|
| 970 |
|
|
goto bad;
|
| 971 |
|
|
break;
|
| 972 |
|
|
case CI_ACCOMPRESSION:
|
| 973 |
|
|
if (go->neg_accompression || no.neg_accompression
|
| 974 |
|
|
|| cilen != CILEN_VOID)
|
| 975 |
|
|
goto bad;
|
| 976 |
|
|
break;
|
| 977 |
|
|
case CI_QUALITY:
|
| 978 |
|
|
if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR)
|
| 979 |
|
|
goto bad;
|
| 980 |
|
|
break;
|
| 981 |
|
|
}
|
| 982 |
|
|
p = next;
|
| 983 |
|
|
}
|
| 984 |
|
|
|
| 985 |
|
|
/* If there is still anything left, this packet is bad. */
|
| 986 |
|
|
if (len != 0)
|
| 987 |
|
|
goto bad;
|
| 988 |
|
|
|
| 989 |
|
|
/*
|
| 990 |
|
|
* OK, the Nak is good. Now we can update state.
|
| 991 |
|
|
*/
|
| 992 |
|
|
if (f->state != OPENED) {
|
| 993 |
|
|
if (looped_back) {
|
| 994 |
|
|
if (++try.numloops >= lcp_loopbackfail) {
|
| 995 |
|
|
LCPDEBUG((LOG_NOTICE, "Serial line is looped back.\n"));
|
| 996 |
|
|
lcp_close(f->unit, "Loopback detected");
|
| 997 |
|
|
}
|
| 998 |
|
|
}
|
| 999 |
|
|
else
|
| 1000 |
|
|
try.numloops = 0;
|
| 1001 |
|
|
*go = try;
|
| 1002 |
|
|
}
|
| 1003 |
|
|
|
| 1004 |
|
|
return 1;
|
| 1005 |
|
|
|
| 1006 |
|
|
bad:
|
| 1007 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_nakci: received bad Nak!\n"));
|
| 1008 |
|
|
return 0;
|
| 1009 |
|
|
}
|
| 1010 |
|
|
|
| 1011 |
|
|
|
| 1012 |
|
|
/*
|
| 1013 |
|
|
* lcp_rejci - Peer has Rejected some of our CIs.
|
| 1014 |
|
|
* This should not modify any state if the Reject is bad
|
| 1015 |
|
|
* or if LCP is in the OPENED state.
|
| 1016 |
|
|
*
|
| 1017 |
|
|
* Returns:
|
| 1018 |
|
|
* 0 - Reject was bad.
|
| 1019 |
|
|
* 1 - Reject was good.
|
| 1020 |
|
|
*/
|
| 1021 |
|
|
static int lcp_rejci(fsm *f, u_char *p, int len)
|
| 1022 |
|
|
{
|
| 1023 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 1024 |
|
|
u_char cichar;
|
| 1025 |
|
|
u_short cishort;
|
| 1026 |
|
|
u32_t cilong;
|
| 1027 |
|
|
lcp_options try; /* options to request next time */
|
| 1028 |
|
|
|
| 1029 |
|
|
try = *go;
|
| 1030 |
|
|
|
| 1031 |
|
|
/*
|
| 1032 |
|
|
* Any Rejected CIs must be in exactly the same order that we sent.
|
| 1033 |
|
|
* Check packet length and CI length at each step.
|
| 1034 |
|
|
* If we find any deviations, then this packet is bad.
|
| 1035 |
|
|
*/
|
| 1036 |
|
|
#define REJCIVOID(opt, neg) \
|
| 1037 |
|
|
if (go->neg && \
|
| 1038 |
|
|
len >= CILEN_VOID && \
|
| 1039 |
|
|
p[1] == CILEN_VOID && \
|
| 1040 |
|
|
p[0] == opt) { \
|
| 1041 |
|
|
len -= CILEN_VOID; \
|
| 1042 |
|
|
INCPTR(CILEN_VOID, p); \
|
| 1043 |
|
|
try.neg = 0; \
|
| 1044 |
|
|
LCPDEBUG((LOG_INFO, "lcp_rejci: void opt %d rejected\n", opt)); \
|
| 1045 |
|
|
}
|
| 1046 |
|
|
#define REJCISHORT(opt, neg, val) \
|
| 1047 |
|
|
if (go->neg && \
|
| 1048 |
|
|
len >= CILEN_SHORT && \
|
| 1049 |
|
|
p[1] == CILEN_SHORT && \
|
| 1050 |
|
|
p[0] == opt) { \
|
| 1051 |
|
|
len -= CILEN_SHORT; \
|
| 1052 |
|
|
INCPTR(2, p); \
|
| 1053 |
|
|
GETSHORT(cishort, p); \
|
| 1054 |
|
|
/* Check rejected value. */ \
|
| 1055 |
|
|
if (cishort != val) \
|
| 1056 |
|
|
goto bad; \
|
| 1057 |
|
|
try.neg = 0; \
|
| 1058 |
|
|
LCPDEBUG((LOG_INFO,"lcp_rejci: short opt %d rejected\n", opt)); \
|
| 1059 |
|
|
}
|
| 1060 |
|
|
#define REJCICHAP(opt, neg, val, digest) \
|
| 1061 |
|
|
if (go->neg && \
|
| 1062 |
|
|
len >= CILEN_CHAP && \
|
| 1063 |
|
|
p[1] == CILEN_CHAP && \
|
| 1064 |
|
|
p[0] == opt) { \
|
| 1065 |
|
|
len -= CILEN_CHAP; \
|
| 1066 |
|
|
INCPTR(2, p); \
|
| 1067 |
|
|
GETSHORT(cishort, p); \
|
| 1068 |
|
|
GETCHAR(cichar, p); \
|
| 1069 |
|
|
/* Check rejected value. */ \
|
| 1070 |
|
|
if (cishort != val || cichar != digest) \
|
| 1071 |
|
|
goto bad; \
|
| 1072 |
|
|
try.neg = 0; \
|
| 1073 |
|
|
try.neg_upap = 0; \
|
| 1074 |
|
|
LCPDEBUG((LOG_INFO,"lcp_rejci: chap opt %d rejected\n", opt)); \
|
| 1075 |
|
|
}
|
| 1076 |
|
|
#define REJCILONG(opt, neg, val) \
|
| 1077 |
|
|
if (go->neg && \
|
| 1078 |
|
|
len >= CILEN_LONG && \
|
| 1079 |
|
|
p[1] == CILEN_LONG && \
|
| 1080 |
|
|
p[0] == opt) { \
|
| 1081 |
|
|
len -= CILEN_LONG; \
|
| 1082 |
|
|
INCPTR(2, p); \
|
| 1083 |
|
|
GETLONG(cilong, p); \
|
| 1084 |
|
|
/* Check rejected value. */ \
|
| 1085 |
|
|
if (cilong != val) \
|
| 1086 |
|
|
goto bad; \
|
| 1087 |
|
|
try.neg = 0; \
|
| 1088 |
|
|
LCPDEBUG((LOG_INFO,"lcp_rejci: long opt %d rejected\n", opt)); \
|
| 1089 |
|
|
}
|
| 1090 |
|
|
#define REJCILQR(opt, neg, val) \
|
| 1091 |
|
|
if (go->neg && \
|
| 1092 |
|
|
len >= CILEN_LQR && \
|
| 1093 |
|
|
p[1] == CILEN_LQR && \
|
| 1094 |
|
|
p[0] == opt) { \
|
| 1095 |
|
|
len -= CILEN_LQR; \
|
| 1096 |
|
|
INCPTR(2, p); \
|
| 1097 |
|
|
GETSHORT(cishort, p); \
|
| 1098 |
|
|
GETLONG(cilong, p); \
|
| 1099 |
|
|
/* Check rejected value. */ \
|
| 1100 |
|
|
if (cishort != PPP_LQR || cilong != val) \
|
| 1101 |
|
|
goto bad; \
|
| 1102 |
|
|
try.neg = 0; \
|
| 1103 |
|
|
LCPDEBUG((LOG_INFO,"lcp_rejci: LQR opt %d rejected\n", opt)); \
|
| 1104 |
|
|
}
|
| 1105 |
|
|
#define REJCICBCP(opt, neg, val) \
|
| 1106 |
|
|
if (go->neg && \
|
| 1107 |
|
|
len >= CILEN_CBCP && \
|
| 1108 |
|
|
p[1] == CILEN_CBCP && \
|
| 1109 |
|
|
p[0] == opt) { \
|
| 1110 |
|
|
len -= CILEN_CBCP; \
|
| 1111 |
|
|
INCPTR(2, p); \
|
| 1112 |
|
|
GETCHAR(cichar, p); \
|
| 1113 |
|
|
/* Check rejected value. */ \
|
| 1114 |
|
|
if (cichar != val) \
|
| 1115 |
|
|
goto bad; \
|
| 1116 |
|
|
try.neg = 0; \
|
| 1117 |
|
|
LCPDEBUG((LOG_INFO,"lcp_rejci: Callback opt %d rejected\n", opt)); \
|
| 1118 |
|
|
}
|
| 1119 |
|
|
|
| 1120 |
|
|
REJCISHORT(CI_MRU, neg_mru, go->mru);
|
| 1121 |
|
|
REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
|
| 1122 |
|
|
REJCICHAP(CI_AUTHTYPE, neg_chap, PPP_CHAP, go->chap_mdtype);
|
| 1123 |
|
|
if (!go->neg_chap) {
|
| 1124 |
|
|
REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
|
| 1125 |
|
|
}
|
| 1126 |
|
|
REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
|
| 1127 |
|
|
REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
|
| 1128 |
|
|
REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
|
| 1129 |
|
|
REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
|
| 1130 |
|
|
REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
|
| 1131 |
|
|
|
| 1132 |
|
|
/*
|
| 1133 |
|
|
* If there are any remaining CIs, then this packet is bad.
|
| 1134 |
|
|
*/
|
| 1135 |
|
|
if (len != 0)
|
| 1136 |
|
|
goto bad;
|
| 1137 |
|
|
/*
|
| 1138 |
|
|
* Now we can update state.
|
| 1139 |
|
|
*/
|
| 1140 |
|
|
if (f->state != OPENED)
|
| 1141 |
|
|
*go = try;
|
| 1142 |
|
|
return 1;
|
| 1143 |
|
|
|
| 1144 |
|
|
bad:
|
| 1145 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_rejci: received bad Reject!\n"));
|
| 1146 |
|
|
return 0;
|
| 1147 |
|
|
}
|
| 1148 |
|
|
|
| 1149 |
|
|
|
| 1150 |
|
|
/*
|
| 1151 |
|
|
* lcp_reqci - Check the peer's requested CIs and send appropriate response.
|
| 1152 |
|
|
*
|
| 1153 |
|
|
* Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
|
| 1154 |
|
|
* appropriately. If reject_if_disagree is non-zero, doesn't return
|
| 1155 |
|
|
* CONFNAK; returns CONFREJ if it can't return CONFACK.
|
| 1156 |
|
|
*/
|
| 1157 |
|
|
static int lcp_reqci(fsm *f,
|
| 1158 |
|
|
u_char *inp, /* Requested CIs */
|
| 1159 |
|
|
int *lenp, /* Length of requested CIs */
|
| 1160 |
|
|
int reject_if_disagree)
|
| 1161 |
|
|
{
|
| 1162 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 1163 |
|
|
lcp_options *ho = &lcp_hisoptions[f->unit];
|
| 1164 |
|
|
lcp_options *ao = &lcp_allowoptions[f->unit];
|
| 1165 |
|
|
u_char *cip, *next; /* Pointer to current and next CIs */
|
| 1166 |
|
|
int cilen, citype, cichar; /* Parsed len, type, char value */
|
| 1167 |
|
|
u_short cishort; /* Parsed short value */
|
| 1168 |
|
|
u32_t cilong; /* Parse long value */
|
| 1169 |
|
|
int rc = CONFACK; /* Final packet return code */
|
| 1170 |
|
|
int orc; /* Individual option return code */
|
| 1171 |
|
|
u_char *p; /* Pointer to next char to parse */
|
| 1172 |
|
|
u_char *rejp; /* Pointer to next char in reject frame */
|
| 1173 |
|
|
u_char *nakp; /* Pointer to next char in Nak frame */
|
| 1174 |
|
|
int l = *lenp; /* Length left */
|
| 1175 |
|
|
#if TRACELCP > 0
|
| 1176 |
|
|
char traceBuf[80];
|
| 1177 |
|
|
int traceNdx = 0;
|
| 1178 |
|
|
#endif
|
| 1179 |
|
|
|
| 1180 |
|
|
/*
|
| 1181 |
|
|
* Reset all his options.
|
| 1182 |
|
|
*/
|
| 1183 |
|
|
BZERO(ho, sizeof(*ho));
|
| 1184 |
|
|
|
| 1185 |
|
|
/*
|
| 1186 |
|
|
* Process all his options.
|
| 1187 |
|
|
*/
|
| 1188 |
|
|
next = inp;
|
| 1189 |
|
|
nakp = nak_buffer;
|
| 1190 |
|
|
rejp = inp;
|
| 1191 |
|
|
while (l) {
|
| 1192 |
|
|
orc = CONFACK; /* Assume success */
|
| 1193 |
|
|
cip = p = next; /* Remember begining of CI */
|
| 1194 |
|
|
if (l < 2 || /* Not enough data for CI header or */
|
| 1195 |
|
|
p[1] < 2 || /* CI length too small or */
|
| 1196 |
|
|
p[1] > l) { /* CI length too big? */
|
| 1197 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: bad CI length!\n"));
|
| 1198 |
|
|
orc = CONFREJ; /* Reject bad CI */
|
| 1199 |
|
|
cilen = l; /* Reject till end of packet */
|
| 1200 |
|
|
l = 0; /* Don't loop again */
|
| 1201 |
|
|
citype = 0;
|
| 1202 |
|
|
goto endswitch;
|
| 1203 |
|
|
}
|
| 1204 |
|
|
GETCHAR(citype, p); /* Parse CI type */
|
| 1205 |
|
|
GETCHAR(cilen, p); /* Parse CI length */
|
| 1206 |
|
|
l -= cilen; /* Adjust remaining length */
|
| 1207 |
|
|
next += cilen; /* Step to next CI */
|
| 1208 |
|
|
|
| 1209 |
|
|
switch (citype) { /* Check CI type */
|
| 1210 |
|
|
case CI_MRU:
|
| 1211 |
|
|
if (!ao->neg_mru) { /* Allow option? */
|
| 1212 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - not allowed\n"));
|
| 1213 |
|
|
orc = CONFREJ; /* Reject CI */
|
| 1214 |
|
|
break;
|
| 1215 |
|
|
} else if (cilen != CILEN_SHORT) { /* Check CI length */
|
| 1216 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - bad length\n"));
|
| 1217 |
|
|
orc = CONFREJ; /* Reject CI */
|
| 1218 |
|
|
break;
|
| 1219 |
|
|
}
|
| 1220 |
|
|
GETSHORT(cishort, p); /* Parse MRU */
|
| 1221 |
|
|
|
| 1222 |
|
|
/*
|
| 1223 |
|
|
* He must be able to receive at least our minimum.
|
| 1224 |
|
|
* No need to check a maximum. If he sends a large number,
|
| 1225 |
|
|
* we'll just ignore it.
|
| 1226 |
|
|
*/
|
| 1227 |
|
|
if (cishort < PPP_MINMRU) {
|
| 1228 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Nak - MRU too small\n"));
|
| 1229 |
|
|
orc = CONFNAK; /* Nak CI */
|
| 1230 |
|
|
PUTCHAR(CI_MRU, nakp);
|
| 1231 |
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
| 1232 |
|
|
PUTSHORT(PPP_MINMRU, nakp); /* Give him a hint */
|
| 1233 |
|
|
break;
|
| 1234 |
|
|
}
|
| 1235 |
|
|
ho->neg_mru = 1; /* Remember he sent MRU */
|
| 1236 |
|
|
ho->mru = cishort; /* And remember value */
|
| 1237 |
|
|
#if TRACELCP > 0
|
| 1238 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MRU %d", cishort);
|
| 1239 |
|
|
traceNdx = strlen(traceBuf);
|
| 1240 |
|
|
#endif
|
| 1241 |
|
|
break;
|
| 1242 |
|
|
|
| 1243 |
|
|
case CI_ASYNCMAP:
|
| 1244 |
|
|
if (!ao->neg_asyncmap) {
|
| 1245 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP not allowed\n"));
|
| 1246 |
|
|
orc = CONFREJ;
|
| 1247 |
|
|
break;
|
| 1248 |
|
|
} else if (cilen != CILEN_LONG) {
|
| 1249 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP bad length\n"));
|
| 1250 |
|
|
orc = CONFREJ;
|
| 1251 |
|
|
break;
|
| 1252 |
|
|
}
|
| 1253 |
|
|
GETLONG(cilong, p);
|
| 1254 |
|
|
|
| 1255 |
|
|
/*
|
| 1256 |
|
|
* Asyncmap must have set at least the bits
|
| 1257 |
|
|
* which are set in lcp_allowoptions[unit].asyncmap.
|
| 1258 |
|
|
*/
|
| 1259 |
|
|
if ((ao->asyncmap & ~cilong) != 0) {
|
| 1260 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Nak ASYNCMAP %lX missing %lX\n",
|
| 1261 |
|
|
cilong, ao->asyncmap));
|
| 1262 |
|
|
orc = CONFNAK;
|
| 1263 |
|
|
PUTCHAR(CI_ASYNCMAP, nakp);
|
| 1264 |
|
|
PUTCHAR(CILEN_LONG, nakp);
|
| 1265 |
|
|
PUTLONG(ao->asyncmap | cilong, nakp);
|
| 1266 |
|
|
break;
|
| 1267 |
|
|
}
|
| 1268 |
|
|
ho->neg_asyncmap = 1;
|
| 1269 |
|
|
ho->asyncmap = cilong;
|
| 1270 |
|
|
#if TRACELCP > 0
|
| 1271 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ASYNCMAP=%lX", cilong);
|
| 1272 |
|
|
traceNdx = strlen(traceBuf);
|
| 1273 |
|
|
#endif
|
| 1274 |
|
|
break;
|
| 1275 |
|
|
|
| 1276 |
|
|
case CI_AUTHTYPE:
|
| 1277 |
|
|
if (cilen < CILEN_SHORT) {
|
| 1278 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE missing arg\n"));
|
| 1279 |
|
|
orc = CONFREJ;
|
| 1280 |
|
|
break;
|
| 1281 |
|
|
} else if (!(ao->neg_upap || ao->neg_chap)) {
|
| 1282 |
|
|
/*
|
| 1283 |
|
|
* Reject the option if we're not willing to authenticate.
|
| 1284 |
|
|
*/
|
| 1285 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE not allowed\n"));
|
| 1286 |
|
|
orc = CONFREJ;
|
| 1287 |
|
|
break;
|
| 1288 |
|
|
}
|
| 1289 |
|
|
GETSHORT(cishort, p);
|
| 1290 |
|
|
|
| 1291 |
|
|
/*
|
| 1292 |
|
|
* Authtype must be UPAP or CHAP.
|
| 1293 |
|
|
*
|
| 1294 |
|
|
* Note: if both ao->neg_upap and ao->neg_chap are set,
|
| 1295 |
|
|
* and the peer sends a Configure-Request with two
|
| 1296 |
|
|
* authenticate-protocol requests, one for CHAP and one
|
| 1297 |
|
|
* for UPAP, then we will reject the second request.
|
| 1298 |
|
|
* Whether we end up doing CHAP or UPAP depends then on
|
| 1299 |
|
|
* the ordering of the CIs in the peer's Configure-Request.
|
| 1300 |
|
|
*/
|
| 1301 |
|
|
|
| 1302 |
|
|
if (cishort == PPP_PAP) {
|
| 1303 |
|
|
if (ho->neg_chap) { /* we've already accepted CHAP */
|
| 1304 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP already accepted\n"));
|
| 1305 |
|
|
orc = CONFREJ;
|
| 1306 |
|
|
break;
|
| 1307 |
|
|
} else if (cilen != CILEN_SHORT) {
|
| 1308 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP bad len\n"));
|
| 1309 |
|
|
orc = CONFREJ;
|
| 1310 |
|
|
break;
|
| 1311 |
|
|
}
|
| 1312 |
|
|
if (!ao->neg_upap) { /* we don't want to do PAP */
|
| 1313 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE PAP not allowed\n"));
|
| 1314 |
|
|
orc = CONFNAK; /* NAK it and suggest CHAP */
|
| 1315 |
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
| 1316 |
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
| 1317 |
|
|
PUTSHORT(PPP_CHAP, nakp);
|
| 1318 |
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
| 1319 |
|
|
break;
|
| 1320 |
|
|
}
|
| 1321 |
|
|
ho->neg_upap = 1;
|
| 1322 |
|
|
#if TRACELCP > 0
|
| 1323 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PAP (%X)", cishort);
|
| 1324 |
|
|
traceNdx = strlen(traceBuf);
|
| 1325 |
|
|
#endif
|
| 1326 |
|
|
break;
|
| 1327 |
|
|
}
|
| 1328 |
|
|
if (cishort == PPP_CHAP) {
|
| 1329 |
|
|
if (ho->neg_upap) { /* we've already accepted PAP */
|
| 1330 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP accepted PAP\n"));
|
| 1331 |
|
|
orc = CONFREJ;
|
| 1332 |
|
|
break;
|
| 1333 |
|
|
} else if (cilen != CILEN_CHAP) {
|
| 1334 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP bad len\n"));
|
| 1335 |
|
|
orc = CONFREJ;
|
| 1336 |
|
|
break;
|
| 1337 |
|
|
}
|
| 1338 |
|
|
if (!ao->neg_chap) { /* we don't want to do CHAP */
|
| 1339 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP not allowed\n"));
|
| 1340 |
|
|
orc = CONFNAK; /* NAK it and suggest PAP */
|
| 1341 |
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
| 1342 |
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
| 1343 |
|
|
PUTSHORT(PPP_PAP, nakp);
|
| 1344 |
|
|
break;
|
| 1345 |
|
|
}
|
| 1346 |
|
|
GETCHAR(cichar, p); /* get digest type*/
|
| 1347 |
|
|
if (cichar != CHAP_DIGEST_MD5
|
| 1348 |
|
|
#ifdef CHAPMS
|
| 1349 |
|
|
&& cichar != CHAP_MICROSOFT
|
| 1350 |
|
|
#endif
|
| 1351 |
|
|
) {
|
| 1352 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP digest=%d\n", cichar));
|
| 1353 |
|
|
orc = CONFNAK;
|
| 1354 |
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
| 1355 |
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
| 1356 |
|
|
PUTSHORT(PPP_CHAP, nakp);
|
| 1357 |
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
| 1358 |
|
|
break;
|
| 1359 |
|
|
}
|
| 1360 |
|
|
#if TRACELCP > 0
|
| 1361 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CHAP %X,%d", cishort, cichar);
|
| 1362 |
|
|
traceNdx = strlen(traceBuf);
|
| 1363 |
|
|
#endif
|
| 1364 |
|
|
ho->chap_mdtype = cichar; /* save md type */
|
| 1365 |
|
|
ho->neg_chap = 1;
|
| 1366 |
|
|
break;
|
| 1367 |
|
|
}
|
| 1368 |
|
|
|
| 1369 |
|
|
/*
|
| 1370 |
|
|
* We don't recognize the protocol they're asking for.
|
| 1371 |
|
|
* Nak it with something we're willing to do.
|
| 1372 |
|
|
* (At this point we know ao->neg_upap || ao->neg_chap.)
|
| 1373 |
|
|
*/
|
| 1374 |
|
|
orc = CONFNAK;
|
| 1375 |
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
| 1376 |
|
|
if (ao->neg_chap) {
|
| 1377 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req CHAP\n", cishort));
|
| 1378 |
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
| 1379 |
|
|
PUTSHORT(PPP_CHAP, nakp);
|
| 1380 |
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
| 1381 |
|
|
}
|
| 1382 |
|
|
else {
|
| 1383 |
|
|
LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req PAP\n", cishort));
|
| 1384 |
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
| 1385 |
|
|
PUTSHORT(PPP_PAP, nakp);
|
| 1386 |
|
|
}
|
| 1387 |
|
|
break;
|
| 1388 |
|
|
|
| 1389 |
|
|
case CI_QUALITY:
|
| 1390 |
|
|
GETSHORT(cishort, p);
|
| 1391 |
|
|
GETLONG(cilong, p);
|
| 1392 |
|
|
#if TRACELCP > 0
|
| 1393 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " QUALITY (%x %x)", cishort, (unsigned int) cilong);
|
| 1394 |
|
|
traceNdx = strlen(traceBuf);
|
| 1395 |
|
|
#endif
|
| 1396 |
|
|
|
| 1397 |
|
|
if (!ao->neg_lqr ||
|
| 1398 |
|
|
cilen != CILEN_LQR) {
|
| 1399 |
|
|
orc = CONFREJ;
|
| 1400 |
|
|
break;
|
| 1401 |
|
|
}
|
| 1402 |
|
|
|
| 1403 |
|
|
/*
|
| 1404 |
|
|
* Check the protocol and the reporting period.
|
| 1405 |
|
|
* XXX When should we Nak this, and what with?
|
| 1406 |
|
|
*/
|
| 1407 |
|
|
if (cishort != PPP_LQR) {
|
| 1408 |
|
|
orc = CONFNAK;
|
| 1409 |
|
|
PUTCHAR(CI_QUALITY, nakp);
|
| 1410 |
|
|
PUTCHAR(CILEN_LQR, nakp);
|
| 1411 |
|
|
PUTSHORT(PPP_LQR, nakp);
|
| 1412 |
|
|
PUTLONG(ao->lqr_period, nakp);
|
| 1413 |
|
|
break;
|
| 1414 |
|
|
}
|
| 1415 |
|
|
break;
|
| 1416 |
|
|
|
| 1417 |
|
|
case CI_MAGICNUMBER:
|
| 1418 |
|
|
if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
|
| 1419 |
|
|
cilen != CILEN_LONG) {
|
| 1420 |
|
|
orc = CONFREJ;
|
| 1421 |
|
|
break;
|
| 1422 |
|
|
}
|
| 1423 |
|
|
GETLONG(cilong, p);
|
| 1424 |
|
|
#if TRACELCP > 0
|
| 1425 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MAGICNUMBER (%lX)", cilong);
|
| 1426 |
|
|
traceNdx = strlen(traceBuf);
|
| 1427 |
|
|
#endif
|
| 1428 |
|
|
|
| 1429 |
|
|
/*
|
| 1430 |
|
|
* He must have a different magic number.
|
| 1431 |
|
|
*/
|
| 1432 |
|
|
if (go->neg_magicnumber &&
|
| 1433 |
|
|
cilong == go->magicnumber) {
|
| 1434 |
|
|
cilong = magic(); /* Don't put magic() inside macro! */
|
| 1435 |
|
|
orc = CONFNAK;
|
| 1436 |
|
|
PUTCHAR(CI_MAGICNUMBER, nakp);
|
| 1437 |
|
|
PUTCHAR(CILEN_LONG, nakp);
|
| 1438 |
|
|
PUTLONG(cilong, nakp);
|
| 1439 |
|
|
break;
|
| 1440 |
|
|
}
|
| 1441 |
|
|
ho->neg_magicnumber = 1;
|
| 1442 |
|
|
ho->magicnumber = cilong;
|
| 1443 |
|
|
break;
|
| 1444 |
|
|
|
| 1445 |
|
|
|
| 1446 |
|
|
case CI_PCOMPRESSION:
|
| 1447 |
|
|
#if TRACELCP > 0
|
| 1448 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PCOMPRESSION");
|
| 1449 |
|
|
traceNdx = strlen(traceBuf);
|
| 1450 |
|
|
#endif
|
| 1451 |
|
|
if (!ao->neg_pcompression ||
|
| 1452 |
|
|
cilen != CILEN_VOID) {
|
| 1453 |
|
|
orc = CONFREJ;
|
| 1454 |
|
|
break;
|
| 1455 |
|
|
}
|
| 1456 |
|
|
ho->neg_pcompression = 1;
|
| 1457 |
|
|
break;
|
| 1458 |
|
|
|
| 1459 |
|
|
case CI_ACCOMPRESSION:
|
| 1460 |
|
|
#if TRACELCP > 0
|
| 1461 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ACCOMPRESSION");
|
| 1462 |
|
|
traceNdx = strlen(traceBuf);
|
| 1463 |
|
|
#endif
|
| 1464 |
|
|
if (!ao->neg_accompression ||
|
| 1465 |
|
|
cilen != CILEN_VOID) {
|
| 1466 |
|
|
orc = CONFREJ;
|
| 1467 |
|
|
break;
|
| 1468 |
|
|
}
|
| 1469 |
|
|
ho->neg_accompression = 1;
|
| 1470 |
|
|
break;
|
| 1471 |
|
|
|
| 1472 |
|
|
case CI_MRRU:
|
| 1473 |
|
|
#if TRACELCP > 0
|
| 1474 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_MRRU");
|
| 1475 |
|
|
traceNdx = strlen(traceBuf);
|
| 1476 |
|
|
#endif
|
| 1477 |
|
|
orc = CONFREJ;
|
| 1478 |
|
|
break;
|
| 1479 |
|
|
|
| 1480 |
|
|
case CI_SSNHF:
|
| 1481 |
|
|
#if TRACELCP > 0
|
| 1482 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_SSNHF");
|
| 1483 |
|
|
traceNdx = strlen(traceBuf);
|
| 1484 |
|
|
#endif
|
| 1485 |
|
|
orc = CONFREJ;
|
| 1486 |
|
|
break;
|
| 1487 |
|
|
|
| 1488 |
|
|
case CI_EPDISC:
|
| 1489 |
|
|
#if TRACELCP > 0
|
| 1490 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_EPDISC");
|
| 1491 |
|
|
traceNdx = strlen(traceBuf);
|
| 1492 |
|
|
#endif
|
| 1493 |
|
|
orc = CONFREJ;
|
| 1494 |
|
|
break;
|
| 1495 |
|
|
|
| 1496 |
|
|
default:
|
| 1497 |
|
|
#if TRACELCP
|
| 1498 |
|
|
snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " unknown %d", citype);
|
| 1499 |
|
|
traceNdx = strlen(traceBuf);
|
| 1500 |
|
|
#endif
|
| 1501 |
|
|
orc = CONFREJ;
|
| 1502 |
|
|
break;
|
| 1503 |
|
|
}
|
| 1504 |
|
|
|
| 1505 |
|
|
endswitch:
|
| 1506 |
|
|
#if TRACELCP
|
| 1507 |
|
|
if (traceNdx >= 80 - 32) {
|
| 1508 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd%s\n", traceBuf));
|
| 1509 |
|
|
traceNdx = 0;
|
| 1510 |
|
|
}
|
| 1511 |
|
|
#endif
|
| 1512 |
|
|
if (orc == CONFACK && /* Good CI */
|
| 1513 |
|
|
rc != CONFACK) /* but prior CI wasnt? */
|
| 1514 |
|
|
continue; /* Don't send this one */
|
| 1515 |
|
|
|
| 1516 |
|
|
if (orc == CONFNAK) { /* Nak this CI? */
|
| 1517 |
|
|
if (reject_if_disagree /* Getting fed up with sending NAKs? */
|
| 1518 |
|
|
&& citype != CI_MAGICNUMBER) {
|
| 1519 |
|
|
orc = CONFREJ; /* Get tough if so */
|
| 1520 |
|
|
}
|
| 1521 |
|
|
else {
|
| 1522 |
|
|
if (rc == CONFREJ) /* Rejecting prior CI? */
|
| 1523 |
|
|
continue; /* Don't send this one */
|
| 1524 |
|
|
rc = CONFNAK;
|
| 1525 |
|
|
}
|
| 1526 |
|
|
}
|
| 1527 |
|
|
if (orc == CONFREJ) { /* Reject this CI */
|
| 1528 |
|
|
rc = CONFREJ;
|
| 1529 |
|
|
if (cip != rejp) /* Need to move rejected CI? */
|
| 1530 |
|
|
BCOPY(cip, rejp, cilen); /* Move it */
|
| 1531 |
|
|
INCPTR(cilen, rejp); /* Update output pointer */
|
| 1532 |
|
|
}
|
| 1533 |
|
|
}
|
| 1534 |
|
|
|
| 1535 |
|
|
/*
|
| 1536 |
|
|
* If we wanted to send additional NAKs (for unsent CIs), the
|
| 1537 |
|
|
* code would go here. The extra NAKs would go at *nakp.
|
| 1538 |
|
|
* At present there are no cases where we want to ask the
|
| 1539 |
|
|
* peer to negotiate an option.
|
| 1540 |
|
|
*/
|
| 1541 |
|
|
|
| 1542 |
|
|
switch (rc) {
|
| 1543 |
|
|
case CONFACK:
|
| 1544 |
|
|
*lenp = (int)(next - inp);
|
| 1545 |
|
|
break;
|
| 1546 |
|
|
case CONFNAK:
|
| 1547 |
|
|
/*
|
| 1548 |
|
|
* Copy the Nak'd options from the nak_buffer to the caller's buffer.
|
| 1549 |
|
|
*/
|
| 1550 |
|
|
*lenp = (int)(nakp - nak_buffer);
|
| 1551 |
|
|
BCOPY(nak_buffer, inp, *lenp);
|
| 1552 |
|
|
break;
|
| 1553 |
|
|
case CONFREJ:
|
| 1554 |
|
|
*lenp = (int)(rejp - inp);
|
| 1555 |
|
|
break;
|
| 1556 |
|
|
}
|
| 1557 |
|
|
|
| 1558 |
|
|
#if TRACELCP > 0
|
| 1559 |
|
|
if (traceNdx > 0) {
|
| 1560 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: %s\n", traceBuf));
|
| 1561 |
|
|
}
|
| 1562 |
|
|
#endif
|
| 1563 |
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: returning CONF%s.\n", CODENAME(rc)));
|
| 1564 |
|
|
return (rc); /* Return final code */
|
| 1565 |
|
|
}
|
| 1566 |
|
|
|
| 1567 |
|
|
|
| 1568 |
|
|
/*
|
| 1569 |
|
|
* lcp_up - LCP has come UP.
|
| 1570 |
|
|
*/
|
| 1571 |
|
|
static void lcp_up(fsm *f)
|
| 1572 |
|
|
{
|
| 1573 |
|
|
lcp_options *wo = &lcp_wantoptions[f->unit];
|
| 1574 |
|
|
lcp_options *ho = &lcp_hisoptions[f->unit];
|
| 1575 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 1576 |
|
|
lcp_options *ao = &lcp_allowoptions[f->unit];
|
| 1577 |
|
|
|
| 1578 |
|
|
if (!go->neg_magicnumber)
|
| 1579 |
|
|
go->magicnumber = 0;
|
| 1580 |
|
|
if (!ho->neg_magicnumber)
|
| 1581 |
|
|
ho->magicnumber = 0;
|
| 1582 |
|
|
|
| 1583 |
|
|
/*
|
| 1584 |
|
|
* Set our MTU to the smaller of the MTU we wanted and
|
| 1585 |
|
|
* the MRU our peer wanted. If we negotiated an MRU,
|
| 1586 |
|
|
* set our MRU to the larger of value we wanted and
|
| 1587 |
|
|
* the value we got in the negotiation.
|
| 1588 |
|
|
*/
|
| 1589 |
|
|
ppp_send_config(f->unit, LWIP_MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)),
|
| 1590 |
|
|
(ho->neg_asyncmap? ho->asyncmap: 0xffffffffl),
|
| 1591 |
|
|
ho->neg_pcompression, ho->neg_accompression);
|
| 1592 |
|
|
/*
|
| 1593 |
|
|
* If the asyncmap hasn't been negotiated, we really should
|
| 1594 |
|
|
* set the receive asyncmap to ffffffff, but we set it to 0
|
| 1595 |
|
|
* for backwards contemptibility.
|
| 1596 |
|
|
*/
|
| 1597 |
|
|
ppp_recv_config(f->unit, (go->neg_mru? LWIP_MAX(wo->mru, go->mru): PPP_MRU),
|
| 1598 |
|
|
(go->neg_asyncmap? go->asyncmap: 0x00000000),
|
| 1599 |
|
|
go->neg_pcompression, go->neg_accompression);
|
| 1600 |
|
|
|
| 1601 |
|
|
if (ho->neg_mru)
|
| 1602 |
|
|
peer_mru[f->unit] = ho->mru;
|
| 1603 |
|
|
|
| 1604 |
|
|
lcp_echo_lowerup(f->unit); /* Enable echo messages */
|
| 1605 |
|
|
|
| 1606 |
|
|
link_established(f->unit);
|
| 1607 |
|
|
}
|
| 1608 |
|
|
|
| 1609 |
|
|
|
| 1610 |
|
|
/*
|
| 1611 |
|
|
* lcp_down - LCP has gone DOWN.
|
| 1612 |
|
|
*
|
| 1613 |
|
|
* Alert other protocols.
|
| 1614 |
|
|
*/
|
| 1615 |
|
|
static void lcp_down(fsm *f)
|
| 1616 |
|
|
{
|
| 1617 |
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
| 1618 |
|
|
|
| 1619 |
|
|
lcp_echo_lowerdown(f->unit);
|
| 1620 |
|
|
|
| 1621 |
|
|
link_down(f->unit);
|
| 1622 |
|
|
|
| 1623 |
|
|
ppp_send_config(f->unit, PPP_MRU, 0xffffffffl, 0, 0);
|
| 1624 |
|
|
ppp_recv_config(f->unit, PPP_MRU,
|
| 1625 |
|
|
(go->neg_asyncmap? go->asyncmap: 0x00000000),
|
| 1626 |
|
|
go->neg_pcompression, go->neg_accompression);
|
| 1627 |
|
|
peer_mru[f->unit] = PPP_MRU;
|
| 1628 |
|
|
}
|
| 1629 |
|
|
|
| 1630 |
|
|
|
| 1631 |
|
|
/*
|
| 1632 |
|
|
* lcp_starting - LCP needs the lower layer up.
|
| 1633 |
|
|
*/
|
| 1634 |
|
|
static void lcp_starting(fsm *f)
|
| 1635 |
|
|
{
|
| 1636 |
|
|
link_required(f->unit);
|
| 1637 |
|
|
}
|
| 1638 |
|
|
|
| 1639 |
|
|
|
| 1640 |
|
|
/*
|
| 1641 |
|
|
* lcp_finished - LCP has finished with the lower layer.
|
| 1642 |
|
|
*/
|
| 1643 |
|
|
static void lcp_finished(fsm *f)
|
| 1644 |
|
|
{
|
| 1645 |
|
|
link_terminated(f->unit);
|
| 1646 |
|
|
}
|
| 1647 |
|
|
|
| 1648 |
|
|
|
| 1649 |
|
|
#if 0
|
| 1650 |
|
|
/*
|
| 1651 |
|
|
* print_string - print a readable representation of a string using
|
| 1652 |
|
|
* printer.
|
| 1653 |
|
|
*/
|
| 1654 |
|
|
static void print_string(
|
| 1655 |
|
|
char *p,
|
| 1656 |
|
|
int len,
|
| 1657 |
|
|
void (*printer) (void *, char *, ...),
|
| 1658 |
|
|
void *arg
|
| 1659 |
|
|
)
|
| 1660 |
|
|
{
|
| 1661 |
|
|
int c;
|
| 1662 |
|
|
|
| 1663 |
|
|
printer(arg, "\"");
|
| 1664 |
|
|
for (; len > 0; --len) {
|
| 1665 |
|
|
c = *p++;
|
| 1666 |
|
|
if (' ' <= c && c <= '~') {
|
| 1667 |
|
|
if (c == '\\' || c == '"')
|
| 1668 |
|
|
printer(arg, "\\");
|
| 1669 |
|
|
printer(arg, "%c", c);
|
| 1670 |
|
|
} else {
|
| 1671 |
|
|
switch (c) {
|
| 1672 |
|
|
case '\n':
|
| 1673 |
|
|
printer(arg, "\\n");
|
| 1674 |
|
|
break;
|
| 1675 |
|
|
case '\r':
|
| 1676 |
|
|
printer(arg, "\\r");
|
| 1677 |
|
|
break;
|
| 1678 |
|
|
case '\t':
|
| 1679 |
|
|
printer(arg, "\\t");
|
| 1680 |
|
|
break;
|
| 1681 |
|
|
default:
|
| 1682 |
|
|
printer(arg, "\\%.3o", c);
|
| 1683 |
|
|
}
|
| 1684 |
|
|
}
|
| 1685 |
|
|
}
|
| 1686 |
|
|
printer(arg, "\"");
|
| 1687 |
|
|
}
|
| 1688 |
|
|
|
| 1689 |
|
|
|
| 1690 |
|
|
/*
|
| 1691 |
|
|
* lcp_printpkt - print the contents of an LCP packet.
|
| 1692 |
|
|
*/
|
| 1693 |
|
|
static char *lcp_codenames[] = {
|
| 1694 |
|
|
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
|
| 1695 |
|
|
"TermReq", "TermAck", "CodeRej", "ProtRej",
|
| 1696 |
|
|
"EchoReq", "EchoRep", "DiscReq"
|
| 1697 |
|
|
};
|
| 1698 |
|
|
|
| 1699 |
|
|
static int lcp_printpkt(
|
| 1700 |
|
|
u_char *p,
|
| 1701 |
|
|
int plen,
|
| 1702 |
|
|
void (*printer) (void *, char *, ...),
|
| 1703 |
|
|
void *arg
|
| 1704 |
|
|
)
|
| 1705 |
|
|
{
|
| 1706 |
|
|
int code, id, len, olen;
|
| 1707 |
|
|
u_char *pstart, *optend;
|
| 1708 |
|
|
u_short cishort;
|
| 1709 |
|
|
u32_t cilong;
|
| 1710 |
|
|
|
| 1711 |
|
|
if (plen < HEADERLEN)
|
| 1712 |
|
|
return 0;
|
| 1713 |
|
|
pstart = p;
|
| 1714 |
|
|
GETCHAR(code, p);
|
| 1715 |
|
|
GETCHAR(id, p);
|
| 1716 |
|
|
GETSHORT(len, p);
|
| 1717 |
|
|
if (len < HEADERLEN || len > plen)
|
| 1718 |
|
|
return 0;
|
| 1719 |
|
|
|
| 1720 |
|
|
if (code >= 1 && code <= sizeof(lcp_codenames) / sizeof(char *))
|
| 1721 |
|
|
printer(arg, " %s", lcp_codenames[code-1]);
|
| 1722 |
|
|
else
|
| 1723 |
|
|
printer(arg, " code=0x%x", code);
|
| 1724 |
|
|
printer(arg, " id=0x%x", id);
|
| 1725 |
|
|
len -= HEADERLEN;
|
| 1726 |
|
|
switch (code) {
|
| 1727 |
|
|
case CONFREQ:
|
| 1728 |
|
|
case CONFACK:
|
| 1729 |
|
|
case CONFNAK:
|
| 1730 |
|
|
case CONFREJ:
|
| 1731 |
|
|
/* print option list */
|
| 1732 |
|
|
while (len >= 2) {
|
| 1733 |
|
|
GETCHAR(code, p);
|
| 1734 |
|
|
GETCHAR(olen, p);
|
| 1735 |
|
|
p -= 2;
|
| 1736 |
|
|
if (olen < 2 || olen > len) {
|
| 1737 |
|
|
break;
|
| 1738 |
|
|
}
|
| 1739 |
|
|
printer(arg, " <");
|
| 1740 |
|
|
len -= olen;
|
| 1741 |
|
|
optend = p + olen;
|
| 1742 |
|
|
switch (code) {
|
| 1743 |
|
|
case CI_MRU:
|
| 1744 |
|
|
if (olen == CILEN_SHORT) {
|
| 1745 |
|
|
p += 2;
|
| 1746 |
|
|
GETSHORT(cishort, p);
|
| 1747 |
|
|
printer(arg, "mru %d", cishort);
|
| 1748 |
|
|
}
|
| 1749 |
|
|
break;
|
| 1750 |
|
|
case CI_ASYNCMAP:
|
| 1751 |
|
|
if (olen == CILEN_LONG) {
|
| 1752 |
|
|
p += 2;
|
| 1753 |
|
|
GETLONG(cilong, p);
|
| 1754 |
|
|
printer(arg, "asyncmap 0x%lx", cilong);
|
| 1755 |
|
|
}
|
| 1756 |
|
|
break;
|
| 1757 |
|
|
case CI_AUTHTYPE:
|
| 1758 |
|
|
if (olen >= CILEN_SHORT) {
|
| 1759 |
|
|
p += 2;
|
| 1760 |
|
|
printer(arg, "auth ");
|
| 1761 |
|
|
GETSHORT(cishort, p);
|
| 1762 |
|
|
switch (cishort) {
|
| 1763 |
|
|
case PPP_PAP:
|
| 1764 |
|
|
printer(arg, "pap");
|
| 1765 |
|
|
break;
|
| 1766 |
|
|
case PPP_CHAP:
|
| 1767 |
|
|
printer(arg, "chap");
|
| 1768 |
|
|
break;
|
| 1769 |
|
|
default:
|
| 1770 |
|
|
printer(arg, "0x%x", cishort);
|
| 1771 |
|
|
}
|
| 1772 |
|
|
}
|
| 1773 |
|
|
break;
|
| 1774 |
|
|
case CI_QUALITY:
|
| 1775 |
|
|
if (olen >= CILEN_SHORT) {
|
| 1776 |
|
|
p += 2;
|
| 1777 |
|
|
printer(arg, "quality ");
|
| 1778 |
|
|
GETSHORT(cishort, p);
|
| 1779 |
|
|
switch (cishort) {
|
| 1780 |
|
|
case PPP_LQR:
|
| 1781 |
|
|
printer(arg, "lqr");
|
| 1782 |
|
|
break;
|
| 1783 |
|
|
default:
|
| 1784 |
|
|
printer(arg, "0x%x", cishort);
|
| 1785 |
|
|
}
|
| 1786 |
|
|
}
|
| 1787 |
|
|
break;
|
| 1788 |
|
|
case CI_CALLBACK:
|
| 1789 |
|
|
if (olen >= CILEN_CHAR) {
|
| 1790 |
|
|
p += 2;
|
| 1791 |
|
|
printer(arg, "callback ");
|
| 1792 |
|
|
GETSHORT(cishort, p);
|
| 1793 |
|
|
switch (cishort) {
|
| 1794 |
|
|
case CBCP_OPT:
|
| 1795 |
|
|
printer(arg, "CBCP");
|
| 1796 |
|
|
break;
|
| 1797 |
|
|
default:
|
| 1798 |
|
|
printer(arg, "0x%x", cishort);
|
| 1799 |
|
|
}
|
| 1800 |
|
|
}
|
| 1801 |
|
|
break;
|
| 1802 |
|
|
case CI_MAGICNUMBER:
|
| 1803 |
|
|
if (olen == CILEN_LONG) {
|
| 1804 |
|
|
p += 2;
|
| 1805 |
|
|
GETLONG(cilong, p);
|
| 1806 |
|
|
printer(arg, "magic 0x%x", cilong);
|
| 1807 |
|
|
}
|
| 1808 |
|
|
break;
|
| 1809 |
|
|
case CI_PCOMPRESSION:
|
| 1810 |
|
|
if (olen == CILEN_VOID) {
|
| 1811 |
|
|
p += 2;
|
| 1812 |
|
|
printer(arg, "pcomp");
|
| 1813 |
|
|
}
|
| 1814 |
|
|
break;
|
| 1815 |
|
|
case CI_ACCOMPRESSION:
|
| 1816 |
|
|
if (olen == CILEN_VOID) {
|
| 1817 |
|
|
p += 2;
|
| 1818 |
|
|
printer(arg, "accomp");
|
| 1819 |
|
|
}
|
| 1820 |
|
|
break;
|
| 1821 |
|
|
}
|
| 1822 |
|
|
while (p < optend) {
|
| 1823 |
|
|
GETCHAR(code, p);
|
| 1824 |
|
|
printer(arg, " %.2x", code);
|
| 1825 |
|
|
}
|
| 1826 |
|
|
printer(arg, ">");
|
| 1827 |
|
|
}
|
| 1828 |
|
|
break;
|
| 1829 |
|
|
|
| 1830 |
|
|
case TERMACK:
|
| 1831 |
|
|
case TERMREQ:
|
| 1832 |
|
|
if (len > 0 && *p >= ' ' && *p < 0x7f) {
|
| 1833 |
|
|
printer(arg, " ");
|
| 1834 |
|
|
print_string((char*)p, len, printer, arg);
|
| 1835 |
|
|
p += len;
|
| 1836 |
|
|
len = 0;
|
| 1837 |
|
|
}
|
| 1838 |
|
|
break;
|
| 1839 |
|
|
|
| 1840 |
|
|
case ECHOREQ:
|
| 1841 |
|
|
case ECHOREP:
|
| 1842 |
|
|
case DISCREQ:
|
| 1843 |
|
|
if (len >= 4) {
|
| 1844 |
|
|
GETLONG(cilong, p);
|
| 1845 |
|
|
printer(arg, " magic=0x%x", cilong);
|
| 1846 |
|
|
p += 4;
|
| 1847 |
|
|
len -= 4;
|
| 1848 |
|
|
}
|
| 1849 |
|
|
break;
|
| 1850 |
|
|
}
|
| 1851 |
|
|
|
| 1852 |
|
|
/* print the rest of the bytes in the packet */
|
| 1853 |
|
|
for (; len > 0; --len) {
|
| 1854 |
|
|
GETCHAR(code, p);
|
| 1855 |
|
|
printer(arg, " %.2x", code);
|
| 1856 |
|
|
}
|
| 1857 |
|
|
|
| 1858 |
|
|
return (int)(p - pstart);
|
| 1859 |
|
|
}
|
| 1860 |
|
|
#endif
|
| 1861 |
|
|
|
| 1862 |
|
|
/*
|
| 1863 |
|
|
* Time to shut down the link because there is nothing out there.
|
| 1864 |
|
|
*/
|
| 1865 |
|
|
|
| 1866 |
|
|
static void LcpLinkFailure (fsm *f)
|
| 1867 |
|
|
{
|
| 1868 |
|
|
if (f->state == OPENED) {
|
| 1869 |
|
|
LCPDEBUG((LOG_INFO, "No response to %d echo-requests\n", lcp_echos_pending));
|
| 1870 |
|
|
LCPDEBUG((LOG_NOTICE, "Serial link appears to be disconnected.\n"));
|
| 1871 |
|
|
lcp_close(f->unit, "Peer not responding");
|
| 1872 |
|
|
}
|
| 1873 |
|
|
}
|
| 1874 |
|
|
|
| 1875 |
|
|
/*
|
| 1876 |
|
|
* Timer expired for the LCP echo requests from this process.
|
| 1877 |
|
|
*/
|
| 1878 |
|
|
|
| 1879 |
|
|
static void LcpEchoCheck (fsm *f)
|
| 1880 |
|
|
{
|
| 1881 |
|
|
LcpSendEchoRequest (f);
|
| 1882 |
|
|
|
| 1883 |
|
|
/*
|
| 1884 |
|
|
* Start the timer for the next interval.
|
| 1885 |
|
|
*/
|
| 1886 |
|
|
LWIP_ASSERT("lcp_echo_timer_running == 0", lcp_echo_timer_running == 0);
|
| 1887 |
|
|
|
| 1888 |
|
|
TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval);
|
| 1889 |
|
|
lcp_echo_timer_running = 1;
|
| 1890 |
|
|
}
|
| 1891 |
|
|
|
| 1892 |
|
|
/*
|
| 1893 |
|
|
* LcpEchoTimeout - Timer expired on the LCP echo
|
| 1894 |
|
|
*/
|
| 1895 |
|
|
|
| 1896 |
|
|
static void LcpEchoTimeout (void *arg)
|
| 1897 |
|
|
{
|
| 1898 |
|
|
if (lcp_echo_timer_running != 0) {
|
| 1899 |
|
|
lcp_echo_timer_running = 0;
|
| 1900 |
|
|
LcpEchoCheck ((fsm *) arg);
|
| 1901 |
|
|
}
|
| 1902 |
|
|
}
|
| 1903 |
|
|
|
| 1904 |
|
|
/*
|
| 1905 |
|
|
* LcpEchoReply - LCP has received a reply to the echo
|
| 1906 |
|
|
*/
|
| 1907 |
|
|
static void lcp_received_echo_reply (fsm *f, int id, u_char *inp, int len)
|
| 1908 |
|
|
{
|
| 1909 |
|
|
u32_t magic;
|
| 1910 |
|
|
|
| 1911 |
|
|
(void)id;
|
| 1912 |
|
|
|
| 1913 |
|
|
/* Check the magic number - don't count replies from ourselves. */
|
| 1914 |
|
|
if (len < 4) {
|
| 1915 |
|
|
LCPDEBUG((LOG_WARNING, "lcp: received short Echo-Reply, length %d\n", len));
|
| 1916 |
|
|
return;
|
| 1917 |
|
|
}
|
| 1918 |
|
|
GETLONG(magic, inp);
|
| 1919 |
|
|
if (lcp_gotoptions[f->unit].neg_magicnumber
|
| 1920 |
|
|
&& magic == lcp_gotoptions[f->unit].magicnumber) {
|
| 1921 |
|
|
LCPDEBUG((LOG_WARNING, "appear to have received our own echo-reply!\n"));
|
| 1922 |
|
|
return;
|
| 1923 |
|
|
}
|
| 1924 |
|
|
|
| 1925 |
|
|
/* Reset the number of outstanding echo frames */
|
| 1926 |
|
|
lcp_echos_pending = 0;
|
| 1927 |
|
|
}
|
| 1928 |
|
|
|
| 1929 |
|
|
/*
|
| 1930 |
|
|
* LcpSendEchoRequest - Send an echo request frame to the peer
|
| 1931 |
|
|
*/
|
| 1932 |
|
|
|
| 1933 |
|
|
static void LcpSendEchoRequest (fsm *f)
|
| 1934 |
|
|
{
|
| 1935 |
|
|
u32_t lcp_magic;
|
| 1936 |
|
|
u_char pkt[4], *pktp;
|
| 1937 |
|
|
|
| 1938 |
|
|
/*
|
| 1939 |
|
|
* Detect the failure of the peer at this point.
|
| 1940 |
|
|
*/
|
| 1941 |
|
|
if (lcp_echo_fails != 0) {
|
| 1942 |
|
|
if (lcp_echos_pending++ >= lcp_echo_fails) {
|
| 1943 |
|
|
LcpLinkFailure(f);
|
| 1944 |
|
|
lcp_echos_pending = 0;
|
| 1945 |
|
|
}
|
| 1946 |
|
|
}
|
| 1947 |
|
|
|
| 1948 |
|
|
/*
|
| 1949 |
|
|
* Make and send the echo request frame.
|
| 1950 |
|
|
*/
|
| 1951 |
|
|
if (f->state == OPENED) {
|
| 1952 |
|
|
lcp_magic = lcp_gotoptions[f->unit].magicnumber;
|
| 1953 |
|
|
pktp = pkt;
|
| 1954 |
|
|
PUTLONG(lcp_magic, pktp);
|
| 1955 |
|
|
fsm_sdata(f, ECHOREQ, (u_char)(lcp_echo_number++ & 0xFF), pkt, (int)(pktp - pkt));
|
| 1956 |
|
|
}
|
| 1957 |
|
|
}
|
| 1958 |
|
|
|
| 1959 |
|
|
/*
|
| 1960 |
|
|
* lcp_echo_lowerup - Start the timer for the LCP frame
|
| 1961 |
|
|
*/
|
| 1962 |
|
|
|
| 1963 |
|
|
static void lcp_echo_lowerup (int unit)
|
| 1964 |
|
|
{
|
| 1965 |
|
|
fsm *f = &lcp_fsm[unit];
|
| 1966 |
|
|
|
| 1967 |
|
|
/* Clear the parameters for generating echo frames */
|
| 1968 |
|
|
lcp_echos_pending = 0;
|
| 1969 |
|
|
lcp_echo_number = 0;
|
| 1970 |
|
|
lcp_echo_timer_running = 0;
|
| 1971 |
|
|
|
| 1972 |
|
|
/* If a timeout interval is specified then start the timer */
|
| 1973 |
|
|
if (lcp_echo_interval != 0)
|
| 1974 |
|
|
LcpEchoCheck (f);
|
| 1975 |
|
|
}
|
| 1976 |
|
|
|
| 1977 |
|
|
/*
|
| 1978 |
|
|
* lcp_echo_lowerdown - Stop the timer for the LCP frame
|
| 1979 |
|
|
*/
|
| 1980 |
|
|
|
| 1981 |
|
|
static void lcp_echo_lowerdown (int unit)
|
| 1982 |
|
|
{
|
| 1983 |
|
|
fsm *f = &lcp_fsm[unit];
|
| 1984 |
|
|
|
| 1985 |
|
|
if (lcp_echo_timer_running != 0) {
|
| 1986 |
|
|
UNTIMEOUT (LcpEchoTimeout, f);
|
| 1987 |
|
|
lcp_echo_timer_running = 0;
|
| 1988 |
|
|
}
|
| 1989 |
|
|
}
|
| 1990 |
|
|
|
| 1991 |
|
|
#endif /* PPP_SUPPORT */
|
