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1830 lines
45 KiB
C
1830 lines
45 KiB
C
/*
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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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#ifndef lint
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static char rcsid[] = "$Id: lcp.c,v 1.22 1995/10/27 03:42:09 paulus Exp $";
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#endif
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/*
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* TODO:
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*/
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <assert.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include "pppd.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "magic.h"
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#include "chap.h"
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#include "upap.h"
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#include "ipcp.h"
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#ifdef _linux_ /* Needs ppp ioctls */
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#include <net/if.h>
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#include <linux/if_ppp.h>
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#endif
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/* global vars */
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fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/
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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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u_int32_t xmit_accm[NUM_PPP][8]; /* extended transmit ACCM */
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static u_int32_t lcp_echos_pending = 0; /* Number of outstanding echo msgs */
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static u_int32_t lcp_echo_number = 0; /* ID number of next echo frame */
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static u_int32_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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#ifdef _linux_
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u_int32_t idle_timer_running = 0;
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extern int idle_time_limit;
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#endif
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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 __P((fsm *)); /* Reset our CI */
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static int lcp_cilen __P((fsm *)); /* Return length of our CI */
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static void lcp_addci __P((fsm *, u_char *, int *)); /* Add our CI to pkt */
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static int lcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
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static int lcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
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static int lcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
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static int lcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv peer CI */
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static void lcp_up __P((fsm *)); /* We're UP */
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static void lcp_down __P((fsm *)); /* We're DOWN */
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static void lcp_starting __P((fsm *)); /* We need lower layer up */
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static void lcp_finished __P((fsm *)); /* We need lower layer down */
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static int lcp_extcode __P((fsm *, int, int, u_char *, int));
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static void lcp_rprotrej __P((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 __P((int));
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static void lcp_echo_lowerdown __P((int));
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static void LcpEchoTimeout __P((caddr_t));
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static void lcp_received_echo_reply __P((fsm *, int, u_char *, int));
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static void LcpSendEchoRequest __P((fsm *));
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static void LcpLinkFailure __P((fsm *));
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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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int lcp_loopbackfail = DEFLOOPBACKFAIL;
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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_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 CODENAME(x) ((x) == CONFACK ? "ACK" : \
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(x) == CONFNAK ? "NAK" : "REJ")
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/*
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* lcp_init - Initialize LCP.
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*/
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void
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lcp_init(unit)
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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 = DEFMRU;
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wo->neg_asyncmap = 0;
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wo->asyncmap = 0;
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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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ao->neg_mru = 1;
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ao->mru = MAXMRU;
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ao->neg_asyncmap = 1;
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ao->asyncmap = 0;
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ao->neg_chap = 1;
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ao->chap_mdtype = CHAP_DIGEST_MD5;
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ao->neg_upap = 1;
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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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memset(xmit_accm[unit], 0, sizeof(xmit_accm[0]));
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xmit_accm[unit][3] = 0x60000000;
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}
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/*
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* lcp_open - LCP is allowed to come up.
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*/
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void
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lcp_open(unit)
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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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f->flags = 0;
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if (wo->passive)
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f->flags |= OPT_PASSIVE;
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if (wo->silent)
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f->flags |= OPT_SILENT;
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fsm_open(f);
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}
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/*
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* lcp_close - Take LCP down.
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*/
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void
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lcp_close(unit)
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int unit;
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{
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fsm *f = &lcp_fsm[unit];
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if (f->state == STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
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/*
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* This action is not strictly according to the FSM in RFC1548,
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* but it does mean that the program terminates if you do a
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* lcp_close(0) in passive/silent mode when a connection hasn't
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* been established.
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*/
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f->state = CLOSED;
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lcp_finished(f);
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} else
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fsm_close(&lcp_fsm[unit]);
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}
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#ifdef _linux_
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static void IdleTimeCheck __P((caddr_t));
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/*
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* Timer expired for the LCP echo requests from this process.
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*/
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static void
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RestartIdleTimer (f)
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fsm *f;
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{
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u_long delta;
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struct ppp_idle ddinfo;
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/*
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* Read the time since the last packet was received.
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*/
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if (ioctl (fd, PPPIOCGIDLE, &ddinfo) < 0) {
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syslog (LOG_ERR, "ioctl(PPPIOCGIDLE): %m");
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die (1);
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}
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/*
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* Compute the time since the last packet was received. If the timer
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* has expired then disconnect the line.
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*/
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delta = idle_time_limit - (u_long) ddinfo.recv_idle;
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if (((int) delta <= 0L) && (f->state == OPENED)) {
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syslog (LOG_NOTICE, "No IP frames received within idle time limit");
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lcp_close(f->unit); /* Reset connection */
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phase = PHASE_TERMINATE; /* Mark it down */
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} else {
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if ((int) delta <= 0L)
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delta = (u_long) idle_time_limit;
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assert (idle_timer_running==0);
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TIMEOUT (IdleTimeCheck, (caddr_t) f, delta);
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idle_timer_running = 1;
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}
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}
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/*
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* IdleTimeCheck - Timer expired on the IDLE detection for IP frames
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*/
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static void
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IdleTimeCheck (arg)
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caddr_t arg;
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{
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if (idle_timer_running != 0) {
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idle_timer_running = 0;
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RestartIdleTimer ((fsm *) arg);
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}
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}
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#endif
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/*
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* lcp_lowerup - The lower layer is up.
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*/
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void
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lcp_lowerup(unit)
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int unit;
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{
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lcp_options *wo = &lcp_wantoptions[unit];
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sifdown(unit);
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/*
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* Don't use A/C or protocol compression on transmission,
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* but accept A/C and protocol compressed packets
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* if we are going to ask for A/C and protocol compression.
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*/
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ppp_set_xaccm(unit, xmit_accm[unit]);
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ppp_send_config(unit, PPP_MRU, 0xffffffff, 0, 0);
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ppp_recv_config(unit, PPP_MRU, 0x00000000,
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wo->neg_pcompression, wo->neg_accompression);
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peer_mru[unit] = PPP_MRU;
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lcp_allowoptions[unit].asyncmap = xmit_accm[unit][0];
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fsm_lowerup(&lcp_fsm[unit]);
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}
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/*
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* lcp_lowerdown - The lower layer is down.
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*/
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void
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lcp_lowerdown(unit)
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int unit;
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{
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fsm_lowerdown(&lcp_fsm[unit]);
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}
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/*
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* lcp_input - Input LCP packet.
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*/
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void
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lcp_input(unit, p, len)
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int unit;
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u_char *p;
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int len;
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{
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fsm *f = &lcp_fsm[unit];
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fsm_input(f, p, len);
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}
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/*
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* lcp_extcode - Handle a LCP-specific code.
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*/
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static int
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lcp_extcode(f, code, id, inp, len)
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fsm *f;
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int code, id;
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u_char *inp;
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int len;
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{
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u_char *magp;
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switch( code ){
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case PROTREJ:
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lcp_rprotrej(f, inp, len);
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break;
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case ECHOREQ:
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if (f->state != OPENED)
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break;
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LCPDEBUG((LOG_INFO, "lcp: Echo-Request, Rcvd id %d", id));
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magp = inp;
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PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
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fsm_sdata(f, ECHOREP, id, inp, len);
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break;
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case ECHOREP:
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lcp_received_echo_reply(f, id, inp, len);
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break;
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case DISCREQ:
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break;
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default:
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return 0;
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}
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return 1;
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}
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/*
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* lcp_rprotrej - Receive an Protocol-Reject.
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*
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* Figure out which protocol is rejected and inform it.
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*/
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static void
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lcp_rprotrej(f, inp, len)
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fsm *f;
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u_char *inp;
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int len;
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{
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u_short prot;
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LCPDEBUG((LOG_INFO, "lcp_rprotrej."));
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if (len < sizeof (u_short)) {
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LCPDEBUG((LOG_INFO,
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"lcp_rprotrej: Rcvd short Protocol-Reject packet!"));
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return;
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}
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GETSHORT(prot, inp);
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LCPDEBUG((LOG_INFO,
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"lcp_rprotrej: Rcvd Protocol-Reject packet for %x!",
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prot));
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/*
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* Protocol-Reject packets received in any state other than the LCP
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* OPENED state SHOULD be silently discarded.
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*/
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if( f->state != OPENED ){
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LCPDEBUG((LOG_INFO, "Protocol-Reject discarded: LCP in state %d",
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f->state));
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return;
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}
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DEMUXPROTREJ(f->unit, prot); /* Inform protocol */
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}
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/*
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* lcp_protrej - A Protocol-Reject was received.
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*/
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/*ARGSUSED*/
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void
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lcp_protrej(unit)
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int unit;
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{
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/*
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* Can't reject LCP!
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*/
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LCPDEBUG((LOG_WARNING,
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"lcp_protrej: Received Protocol-Reject for LCP!"));
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fsm_protreject(&lcp_fsm[unit]);
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}
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/*
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* lcp_sprotrej - Send a Protocol-Reject for some protocol.
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*/
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void
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lcp_sprotrej(unit, p, len)
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int unit;
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u_char *p;
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int len;
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{
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/*
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* Send back the protocol and the information field of the
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* rejected packet. We only get here if LCP is in the OPENED state.
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*/
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p += 2;
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len -= 2;
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fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id,
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p, len);
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}
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/*
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* lcp_resetci - Reset our CI.
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*/
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static void
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lcp_resetci(f)
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fsm *f;
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{
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lcp_wantoptions[f->unit].magicnumber = magic();
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lcp_wantoptions[f->unit].numloops = 0;
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lcp_gotoptions[f->unit] = lcp_wantoptions[f->unit];
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peer_mru[f->unit] = PPP_MRU;
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}
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/*
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* lcp_cilen - Return length of our CI.
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*/
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static int
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lcp_cilen(f)
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fsm *f;
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{
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lcp_options *go = &lcp_gotoptions[f->unit];
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#define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
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#define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
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#define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
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#define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
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#define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
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/*
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* NB: we only ask for one of CHAP and UPAP, even if we will
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* accept either.
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*/
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return (LENCISHORT(go->neg_mru && go->mru != DEFMRU) +
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LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) +
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LENCICHAP(go->neg_chap) +
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LENCISHORT(!go->neg_chap && go->neg_upap) +
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LENCILQR(go->neg_lqr) +
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LENCILONG(go->neg_magicnumber) +
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LENCIVOID(go->neg_pcompression) +
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LENCIVOID(go->neg_accompression));
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}
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/*
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* lcp_addci - Add our desired CIs to a packet.
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*/
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static void
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lcp_addci(f, ucp, lenp)
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fsm *f;
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u_char *ucp;
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int *lenp;
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{
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lcp_options *go = &lcp_gotoptions[f->unit];
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u_char *start_ucp = ucp;
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#define ADDCIVOID(opt, neg) \
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if (neg) { \
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PUTCHAR(opt, ucp); \
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PUTCHAR(CILEN_VOID, ucp); \
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}
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#define ADDCISHORT(opt, neg, val) \
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if (neg) { \
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PUTCHAR(opt, ucp); \
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PUTCHAR(CILEN_SHORT, ucp); \
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PUTSHORT(val, ucp); \
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}
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#define ADDCICHAP(opt, neg, val, digest) \
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if (neg) { \
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PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_CHAP, ucp); \
|
|
PUTSHORT(val, ucp); \
|
|
PUTCHAR(digest, ucp); \
|
|
}
|
|
#define ADDCILONG(opt, neg, val) \
|
|
if (neg) { \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_LONG, ucp); \
|
|
PUTLONG(val, ucp); \
|
|
}
|
|
#define ADDCILQR(opt, neg, val) \
|
|
if (neg) { \
|
|
PUTCHAR(opt, ucp); \
|
|
PUTCHAR(CILEN_LQR, ucp); \
|
|
PUTSHORT(PPP_LQR, ucp); \
|
|
PUTLONG(val, ucp); \
|
|
}
|
|
|
|
ADDCISHORT(CI_MRU, go->neg_mru && go->mru != DEFMRU, go->mru);
|
|
ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
|
|
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);
|
|
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 */
|
|
syslog(LOG_ERR, "Bug in lcp_addci: wrong length");
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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(f, p, len)
|
|
fsm *f;
|
|
u_char *p;
|
|
int len;
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
u_char cilen, citype, cichar;
|
|
u_short cishort;
|
|
u_int32_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 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 != DEFMRU, go->mru);
|
|
ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
|
|
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);
|
|
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;
|
|
return (1);
|
|
bad:
|
|
LCPDEBUG((LOG_WARNING, "lcp_acki: received bad Ack!"));
|
|
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 OPENED state.
|
|
*
|
|
* Returns:
|
|
* 0 - Nak was bad.
|
|
* 1 - Nak was good.
|
|
*/
|
|
static int
|
|
lcp_nakci(f, p, len)
|
|
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;
|
|
u_int32_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 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 != DEFMRU) {
|
|
NAKCISHORT(CI_MRU, neg_mru,
|
|
if (cishort <= wo->mru || cishort < DEFMRU)
|
|
try.mru = cishort;
|
|
);
|
|
}
|
|
|
|
/*
|
|
* Add any characters they want to our (receive-side) asyncmap.
|
|
*/
|
|
if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) {
|
|
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) {
|
|
cilen = p[1];
|
|
INCPTR(2, p);
|
|
GETSHORT(cishort, p);
|
|
if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
|
|
/*
|
|
* If they are asking for PAP, then they don't want to do CHAP.
|
|
* 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;
|
|
go->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)
|
|
go->neg_chap = 0;
|
|
} else {
|
|
/*
|
|
* Stop asking for PAP if we were asking for it.
|
|
*/
|
|
go->neg_upap = 0;
|
|
}
|
|
|
|
} else {
|
|
/*
|
|
* We don't recognize what they're suggesting.
|
|
* Stop asking for what we were asking for.
|
|
*/
|
|
if (go->neg_chap)
|
|
go->neg_chap = 0;
|
|
else
|
|
go->neg_upap = 0;
|
|
p += cilen - CILEN_SHORT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (!go->neg_chap ){
|
|
NAKCISHORT(CI_AUTHTYPE, neg_upap,
|
|
try.neg_upap = 0;
|
|
);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
);
|
|
|
|
/*
|
|
* Check for a looped-back line.
|
|
*/
|
|
NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
|
|
try.magicnumber = magic();
|
|
looped_back = 1;
|
|
);
|
|
|
|
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 ((len -= cilen) < 0)
|
|
goto bad;
|
|
next = p + cilen - 2;
|
|
|
|
switch (citype) {
|
|
case CI_MRU:
|
|
if (go->neg_mru && go->mru != DEFMRU
|
|
|| no.neg_mru || cilen != CILEN_SHORT)
|
|
goto bad;
|
|
GETSHORT(cishort, p);
|
|
if (cishort < DEFMRU)
|
|
try.mru = cishort;
|
|
break;
|
|
case CI_ASYNCMAP:
|
|
if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF
|
|
|| 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 != OPENED) {
|
|
if (looped_back) {
|
|
if (++try.numloops >= lcp_loopbackfail) {
|
|
syslog(LOG_NOTICE, "Serial line is looped back.");
|
|
lcp_close(f->unit);
|
|
}
|
|
} else
|
|
try.numloops = 0;
|
|
*go = try;
|
|
}
|
|
|
|
return 1;
|
|
|
|
bad:
|
|
LCPDEBUG((LOG_WARNING, "lcp_nakci: received bad Nak!"));
|
|
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 OPENED state.
|
|
*
|
|
* Returns:
|
|
* 0 - Reject was bad.
|
|
* 1 - Reject was good.
|
|
*/
|
|
static int
|
|
lcp_rejci(f, p, len)
|
|
fsm *f;
|
|
u_char *p;
|
|
int len;
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
u_char cichar;
|
|
u_short cishort;
|
|
u_int32_t cilong;
|
|
u_char *start = p;
|
|
int plen = len;
|
|
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 rejected void opt %d", 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 rejected short opt %d", 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 rejected chap opt %d", 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 rejected long opt %d", 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 rejected LQR opt %d", 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);
|
|
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 != OPENED)
|
|
*go = try;
|
|
return 1;
|
|
|
|
bad:
|
|
LCPDEBUG((LOG_WARNING, "lcp_rejci: received bad Reject!"));
|
|
LCPDEBUG((LOG_WARNING, "lcp_rejci: plen %d len %d off %d",
|
|
plen, len, p - start));
|
|
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(f, inp, lenp, reject_if_disagree)
|
|
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 */
|
|
u_char cilen, citype, cichar;/* Parsed len, type, char value */
|
|
u_short cishort; /* Parsed short value */
|
|
u_int32_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 */
|
|
|
|
/*
|
|
* 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!"));
|
|
orc = CONFREJ; /* Reject bad CI */
|
|
cilen = l; /* Reject till end of packet */
|
|
l = 0; /* Don't loop again */
|
|
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:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd MRU"));
|
|
if (!ao->neg_mru || /* Allow option? */
|
|
cilen != CILEN_SHORT) { /* Check CI length */
|
|
orc = CONFREJ; /* Reject CI */
|
|
break;
|
|
}
|
|
GETSHORT(cishort, p); /* Parse MRU */
|
|
LCPDEBUG((LOG_INFO, "(%d)", cishort));
|
|
|
|
/*
|
|
* 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 < MINMRU) {
|
|
orc = CONFNAK; /* Nak CI */
|
|
PUTCHAR(CI_MRU, nakp);
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
|
PUTSHORT(MINMRU, nakp); /* Give him a hint */
|
|
break;
|
|
}
|
|
ho->neg_mru = 1; /* Remember he sent MRU */
|
|
ho->mru = cishort; /* And remember value */
|
|
break;
|
|
|
|
case CI_ASYNCMAP:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd ASYNCMAP"));
|
|
if (!ao->neg_asyncmap ||
|
|
cilen != CILEN_LONG) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
GETLONG(cilong, p);
|
|
LCPDEBUG((LOG_INFO, "(%x)", (unsigned int) cilong));
|
|
|
|
/*
|
|
* Asyncmap must have set at least the bits
|
|
* which are set in lcp_allowoptions[unit].asyncmap.
|
|
*/
|
|
if ((ao->asyncmap & ~cilong) != 0) {
|
|
orc = CONFNAK;
|
|
PUTCHAR(CI_ASYNCMAP, nakp);
|
|
PUTCHAR(CILEN_LONG, nakp);
|
|
PUTLONG(ao->asyncmap | cilong, nakp);
|
|
break;
|
|
}
|
|
ho->neg_asyncmap = 1;
|
|
ho->asyncmap = cilong;
|
|
break;
|
|
|
|
case CI_AUTHTYPE:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd AUTHTYPE"));
|
|
if (cilen < CILEN_SHORT ||
|
|
!(ao->neg_upap || ao->neg_chap)) {
|
|
/*
|
|
* Reject the option if we're not willing to authenticate.
|
|
*/
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
GETSHORT(cishort, p);
|
|
LCPDEBUG((LOG_INFO, "(%x)", cishort));
|
|
|
|
/*
|
|
* 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 */
|
|
cilen != CILEN_SHORT) {
|
|
LCPDEBUG((LOG_WARNING,
|
|
"lcp_reqci: rcvd AUTHTYPE PAP, rejecting..."));
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
if (!ao->neg_upap) { /* we don't want to do PAP */
|
|
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;
|
|
break;
|
|
}
|
|
if (cishort == PPP_CHAP) {
|
|
if (ho->neg_upap || /* we've already accepted PAP */
|
|
cilen != CILEN_CHAP) {
|
|
LCPDEBUG((LOG_INFO,
|
|
"lcp_reqci: rcvd AUTHTYPE CHAP, rejecting..."));
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
if (!ao->neg_chap) { /* we don't want to do CHAP */
|
|
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 != ao->chap_mdtype) {
|
|
orc = CONFNAK;
|
|
PUTCHAR(CI_AUTHTYPE, nakp);
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
|
PUTSHORT(PPP_CHAP, nakp);
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
|
break;
|
|
}
|
|
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) {
|
|
PUTCHAR(CILEN_CHAP, nakp);
|
|
PUTSHORT(PPP_CHAP, nakp);
|
|
PUTCHAR(ao->chap_mdtype, nakp);
|
|
} else {
|
|
PUTCHAR(CILEN_SHORT, nakp);
|
|
PUTSHORT(PPP_PAP, nakp);
|
|
}
|
|
break;
|
|
|
|
case CI_QUALITY:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd QUALITY"));
|
|
if (!ao->neg_lqr ||
|
|
cilen != CILEN_LQR) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
GETSHORT(cishort, p);
|
|
GETLONG(cilong, p);
|
|
LCPDEBUG((LOG_INFO, "(%x %x)", cishort, (unsigned int) cilong));
|
|
|
|
/*
|
|
* 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:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd MAGICNUMBER"));
|
|
if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
|
|
cilen != CILEN_LONG) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
GETLONG(cilong, p);
|
|
LCPDEBUG((LOG_INFO, "(%x)", (unsigned int) cilong));
|
|
|
|
/*
|
|
* 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:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd PCOMPRESSION"));
|
|
if (!ao->neg_pcompression ||
|
|
cilen != CILEN_VOID) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
ho->neg_pcompression = 1;
|
|
break;
|
|
|
|
case CI_ACCOMPRESSION:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd ACCOMPRESSION"));
|
|
if (!ao->neg_accompression ||
|
|
cilen != CILEN_VOID) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
ho->neg_accompression = 1;
|
|
break;
|
|
|
|
default:
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd unknown option %d",
|
|
citype));
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
endswitch:
|
|
LCPDEBUG((LOG_INFO, " (%s)", CODENAME(orc)));
|
|
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 = next - inp;
|
|
break;
|
|
case CONFNAK:
|
|
/*
|
|
* Copy the Nak'd options from the nak_buffer to the caller's buffer.
|
|
*/
|
|
*lenp = nakp - nak_buffer;
|
|
BCOPY(nak_buffer, inp, *lenp);
|
|
break;
|
|
case CONFREJ:
|
|
*lenp = rejp - inp;
|
|
break;
|
|
}
|
|
|
|
LCPDEBUG((LOG_INFO, "lcp_reqci: returning CONF%s.", CODENAME(rc)));
|
|
return (rc); /* Return final code */
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_up - LCP has come UP.
|
|
*
|
|
* Start UPAP, IPCP, etc.
|
|
*/
|
|
static void
|
|
lcp_up(f)
|
|
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, MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)),
|
|
(ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
|
|
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? 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;
|
|
|
|
ChapLowerUp(f->unit); /* Enable CHAP */
|
|
upap_lowerup(f->unit); /* Enable UPAP */
|
|
ipcp_lowerup(f->unit); /* Enable IPCP */
|
|
ccp_lowerup(f->unit); /* Enable CCP */
|
|
lcp_echo_lowerup(f->unit); /* Enable echo messages */
|
|
|
|
link_established(f->unit);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_down - LCP has gone DOWN.
|
|
*
|
|
* Alert other protocols.
|
|
*/
|
|
static void
|
|
lcp_down(f)
|
|
fsm *f;
|
|
{
|
|
lcp_options *go = &lcp_gotoptions[f->unit];
|
|
|
|
lcp_echo_lowerdown(f->unit);
|
|
ccp_lowerdown(f->unit);
|
|
ipcp_lowerdown(f->unit);
|
|
ChapLowerDown(f->unit);
|
|
upap_lowerdown(f->unit);
|
|
|
|
sifdown(f->unit);
|
|
ppp_send_config(f->unit, PPP_MRU, 0xffffffff, 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;
|
|
|
|
link_down(f->unit);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_starting - LCP needs the lower layer up.
|
|
*/
|
|
static void
|
|
lcp_starting(f)
|
|
fsm *f;
|
|
{
|
|
link_required(f->unit);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_finished - LCP has finished with the lower layer.
|
|
*/
|
|
static void
|
|
lcp_finished(f)
|
|
fsm *f;
|
|
{
|
|
link_terminated(f->unit);
|
|
}
|
|
|
|
|
|
/*
|
|
* lcp_printpkt - print the contents of an LCP packet.
|
|
*/
|
|
char *lcp_codenames[] = {
|
|
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
|
|
"TermReq", "TermAck", "CodeRej", "ProtRej",
|
|
"EchoReq", "EchoRep", "DiscReq"
|
|
};
|
|
|
|
int
|
|
lcp_printpkt(p, plen, printer, arg)
|
|
u_char *p;
|
|
int plen;
|
|
void (*printer) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int code, id, len, olen;
|
|
u_char *pstart, *optend;
|
|
u_short cishort;
|
|
u_int32_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%x", cilong);
|
|
}
|
|
break;
|
|
case CI_AUTHTYPE:
|
|
if (olen >= CILEN_SHORT) {
|
|
p += 2;
|
|
printer(arg, "auth ");
|
|
GETSHORT(cishort, p);
|
|
switch (cishort) {
|
|
case PPP_PAP:
|
|
printer(arg, "upap");
|
|
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_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;
|
|
}
|
|
|
|
/* print the rest of the bytes in the packet */
|
|
for (; len > 0; --len) {
|
|
GETCHAR(code, p);
|
|
printer(arg, " %.2x", code);
|
|
}
|
|
|
|
return p - pstart;
|
|
}
|
|
|
|
/*
|
|
* Time to shut down the link because there is nothing out there.
|
|
*/
|
|
|
|
static
|
|
void LcpLinkFailure (f)
|
|
fsm *f;
|
|
{
|
|
if (f->state == OPENED) {
|
|
syslog (LOG_NOTICE, "Excessive lack of response to LCP echo frames.");
|
|
lcp_close(f->unit); /* Reset connection */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Timer expired for the LCP echo requests from this process.
|
|
*/
|
|
|
|
static void
|
|
LcpEchoCheck (f)
|
|
fsm *f;
|
|
{
|
|
long int delta;
|
|
#ifdef __linux__
|
|
struct ppp_idle ddinfo;
|
|
/*
|
|
* Read the time since the last packet was received.
|
|
*/
|
|
if (ioctl (fd, PPPIOCGIDLE, &ddinfo) < 0) {
|
|
syslog (LOG_ERR, "ioctl(PPPIOCGIDLE): %m");
|
|
die (1);
|
|
}
|
|
/*
|
|
* Compute the time since the last packet was received. If the timer
|
|
* has expired then send the echo request and reset the timer to maximum.
|
|
*/
|
|
delta = (long int) lcp_echo_interval - (long int) ddinfo.recv_idle;
|
|
if (delta < 0L) {
|
|
LcpSendEchoRequest (f);
|
|
delta = (int) lcp_echo_interval;
|
|
}
|
|
|
|
#else /* Other implementations do not have ability to find delta */
|
|
LcpSendEchoRequest (f);
|
|
delta = (int) lcp_echo_interval;
|
|
#endif
|
|
|
|
/*
|
|
* Start the timer for the next interval.
|
|
*/
|
|
assert (lcp_echo_timer_running==0);
|
|
TIMEOUT (LcpEchoTimeout, (caddr_t) f, (u_int32_t) delta);
|
|
lcp_echo_timer_running = 1;
|
|
}
|
|
|
|
/*
|
|
* LcpEchoTimeout - Timer expired on the LCP echo
|
|
*/
|
|
|
|
static void
|
|
LcpEchoTimeout (arg)
|
|
caddr_t 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 (f, id, inp, len)
|
|
fsm *f;
|
|
int id; u_char *inp; int len;
|
|
{
|
|
u_int32_t magic;
|
|
|
|
/* Check the magic number - don't count replies from ourselves. */
|
|
if (len < 4) {
|
|
syslog(LOG_DEBUG, "lcp: received short Echo-Reply, length %d", len);
|
|
return;
|
|
}
|
|
GETLONG(magic, inp);
|
|
if (lcp_gotoptions[f->unit].neg_magicnumber
|
|
&& magic == lcp_gotoptions[f->unit].magicnumber) {
|
|
syslog(LOG_WARNING, "appear to have received our own echo-reply!");
|
|
return;
|
|
}
|
|
|
|
/* Reset the number of outstanding echo frames */
|
|
lcp_echos_pending = 0;
|
|
}
|
|
|
|
/*
|
|
* LcpSendEchoRequest - Send an echo request frame to the peer
|
|
*/
|
|
|
|
static void
|
|
LcpSendEchoRequest (f)
|
|
fsm *f;
|
|
{
|
|
u_int32_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 == OPENED) {
|
|
lcp_magic = lcp_gotoptions[f->unit].magicnumber;
|
|
pktp = pkt;
|
|
PUTLONG(lcp_magic, pktp);
|
|
|
|
fsm_sdata(f, ECHOREQ,
|
|
lcp_echo_number++ & 0xFF, pkt, pktp - pkt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* lcp_echo_lowerup - Start the timer for the LCP frame
|
|
*/
|
|
|
|
static void
|
|
lcp_echo_lowerup (unit)
|
|
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);
|
|
#ifdef _linux_
|
|
/* If a idle time limit is given then start it */
|
|
if (idle_time_limit != 0)
|
|
RestartIdleTimer (f);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* lcp_echo_lowerdown - Stop the timer for the LCP frame
|
|
*/
|
|
|
|
static void
|
|
lcp_echo_lowerdown (unit)
|
|
int unit;
|
|
{
|
|
fsm *f = &lcp_fsm[unit];
|
|
|
|
if (lcp_echo_timer_running != 0) {
|
|
UNTIMEOUT (LcpEchoTimeout, (caddr_t) f);
|
|
lcp_echo_timer_running = 0;
|
|
}
|
|
#ifdef _linux_
|
|
/* If a idle time limit is running then stop it */
|
|
if (idle_timer_running != 0) {
|
|
UNTIMEOUT (IdleTimeCheck, (caddr_t) f);
|
|
idle_timer_running = 0;
|
|
}
|
|
#endif
|
|
}
|