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1197 lines
29 KiB
C
1197 lines
29 KiB
C
/*
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* ipcp.c - PPP IP 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: ipcp.c,v 1.2 1994/09/25 02:31:59 wollman 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 <sys/types.h>
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#include <sys/socket.h>
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#include "pppd.h"
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#include "ppp.h"
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#include "fsm.h"
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#include "ipcp.h"
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#include "pathnames.h"
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/* global vars */
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ipcp_options ipcp_wantoptions[NPPP]; /* Options that we want to request */
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ipcp_options ipcp_gotoptions[NPPP]; /* Options that peer ack'd */
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ipcp_options ipcp_allowoptions[NPPP]; /* Options we allow peer to request */
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ipcp_options ipcp_hisoptions[NPPP]; /* Options that we ack'd */
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extern char ifname[];
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extern char devname[];
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extern int baud_rate;
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/* local vars */
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static int cis_received[NPPP]; /* # Conf-Reqs received */
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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 ipcp_resetci __ARGS((fsm *)); /* Reset our CI */
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static int ipcp_cilen __ARGS((fsm *)); /* Return length of our CI */
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static void ipcp_addci __ARGS((fsm *, u_char *, int *)); /* Add our CI */
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static int ipcp_ackci __ARGS((fsm *, u_char *, int)); /* Peer ack'd our CI */
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static int ipcp_nakci __ARGS((fsm *, u_char *, int)); /* Peer nak'd our CI */
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static int ipcp_rejci __ARGS((fsm *, u_char *, int)); /* Peer rej'd our CI */
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static int ipcp_reqci __ARGS((fsm *, u_char *, int *, int)); /* Rcv CI */
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static void ipcp_up __ARGS((fsm *)); /* We're UP */
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static void ipcp_down __ARGS((fsm *)); /* We're DOWN */
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static void ipcp_script __ARGS((fsm *, char *)); /* Run an up/down script */
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fsm ipcp_fsm[NPPP]; /* IPCP fsm structure */
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static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
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ipcp_resetci, /* Reset our Configuration Information */
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ipcp_cilen, /* Length of our Configuration Information */
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ipcp_addci, /* Add our Configuration Information */
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ipcp_ackci, /* ACK our Configuration Information */
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ipcp_nakci, /* NAK our Configuration Information */
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ipcp_rejci, /* Reject our Configuration Information */
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ipcp_reqci, /* Request peer's Configuration Information */
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ipcp_up, /* Called when fsm reaches OPENED state */
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ipcp_down, /* Called when fsm leaves OPENED state */
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NULL, /* Called when we want the lower layer up */
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NULL, /* 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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NULL, /* Called to handle protocol-specific codes */
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"IPCP" /* String name of protocol */
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};
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/*
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* Lengths of configuration options.
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*/
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#define CILEN_VOID 2
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#define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
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#define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
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#define CILEN_ADDR 6 /* new-style single address option */
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#define CILEN_ADDRS 10 /* old-style dual address option */
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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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* Make a string representation of a network IP address.
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*/
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char *
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ip_ntoa(ipaddr)
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u_long ipaddr;
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{
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static char b[64];
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ipaddr = ntohl(ipaddr);
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sprintf(b, "%d.%d.%d.%d",
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(u_char)(ipaddr >> 24),
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(u_char)(ipaddr >> 16),
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(u_char)(ipaddr >> 8),
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(u_char)(ipaddr));
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return b;
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}
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/*
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* ipcp_init - Initialize IPCP.
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*/
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void
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ipcp_init(unit)
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int unit;
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{
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fsm *f = &ipcp_fsm[unit];
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ipcp_options *wo = &ipcp_wantoptions[unit];
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ipcp_options *ao = &ipcp_allowoptions[unit];
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f->unit = unit;
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f->protocol = IPCP;
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f->callbacks = &ipcp_callbacks;
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fsm_init(&ipcp_fsm[unit]);
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wo->neg_addr = 1;
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wo->old_addrs = 0;
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wo->ouraddr = 0;
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wo->hisaddr = 0;
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wo->neg_vj = 1;
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wo->old_vj = 0;
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wo->vj_protocol = IPCP_VJ_COMP;
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wo->maxslotindex = MAX_STATES - 1; /* really max index */
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wo->cflag = 1;
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/* max slots and slot-id compression are currently hardwired in */
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/* ppp_if.c to 16 and 1, this needs to be changed (among other */
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/* things) gmc */
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ao->neg_addr = 1;
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ao->neg_vj = 1;
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ao->maxslotindex = MAX_STATES - 1;
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ao->cflag = 1;
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}
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/*
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* ipcp_open - IPCP is allowed to come up.
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*/
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void
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ipcp_open(unit)
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int unit;
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{
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fsm_open(&ipcp_fsm[unit]);
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}
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/*
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* ipcp_close - Take IPCP down.
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*/
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void
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ipcp_close(unit)
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int unit;
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{
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fsm_close(&ipcp_fsm[unit]);
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}
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/*
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* ipcp_lowerup - The lower layer is up.
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*/
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void
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ipcp_lowerup(unit)
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int unit;
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{
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fsm_lowerup(&ipcp_fsm[unit]);
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}
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/*
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* ipcp_lowerdown - The lower layer is down.
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*/
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void
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ipcp_lowerdown(unit)
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int unit;
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{
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fsm_lowerdown(&ipcp_fsm[unit]);
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}
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/*
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* ipcp_input - Input IPCP packet.
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*/
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void
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ipcp_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_input(&ipcp_fsm[unit], p, len);
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}
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/*
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* ipcp_protrej - A Protocol-Reject was received for IPCP.
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*
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* Pretend the lower layer went down, so we shut up.
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*/
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void
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ipcp_protrej(unit)
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int unit;
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{
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fsm_lowerdown(&ipcp_fsm[unit]);
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}
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/*
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* ipcp_resetci - Reset our CI.
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*/
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static void
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ipcp_resetci(f)
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fsm *f;
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{
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ipcp_options *wo = &ipcp_wantoptions[f->unit];
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wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
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if (wo->ouraddr == 0)
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wo->accept_local = 1;
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if (wo->hisaddr == 0)
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wo->accept_remote = 1;
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ipcp_gotoptions[f->unit] = *wo;
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cis_received[f->unit] = 0;
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}
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/*
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* ipcp_cilen - Return length of our CI.
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*/
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static int
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ipcp_cilen(f)
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fsm *f;
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{
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ipcp_options *go = &ipcp_gotoptions[f->unit];
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#define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
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#define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
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return (LENCIADDR(go->neg_addr, go->old_addrs) +
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LENCIVJ(go->neg_vj, go->old_vj));
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}
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/*
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* ipcp_addci - Add our desired CIs to a packet.
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*/
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static void
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ipcp_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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ipcp_options *wo = &ipcp_wantoptions[f->unit];
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ipcp_options *go = &ipcp_gotoptions[f->unit];
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ipcp_options *ho = &ipcp_hisoptions[f->unit];
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int len = *lenp;
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#define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
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if (neg) { \
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int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
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if (len >= vjlen) { \
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PUTCHAR(opt, ucp); \
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PUTCHAR(vjlen, ucp); \
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PUTSHORT(val, ucp); \
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if (!old) { \
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PUTCHAR(maxslotindex, ucp); \
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PUTCHAR(cflag, ucp); \
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} \
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len -= vjlen; \
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} else \
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neg = 0; \
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}
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#define ADDCIADDR(opt, neg, old, val1, val2) \
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if (neg) { \
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int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
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if (len >= addrlen) { \
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u_long l; \
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PUTCHAR(opt, ucp); \
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PUTCHAR(addrlen, ucp); \
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l = ntohl(val1); \
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PUTLONG(l, ucp); \
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if (old) { \
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l = ntohl(val2); \
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PUTLONG(l, ucp); \
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} \
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len -= addrlen; \
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} else \
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neg = 0; \
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}
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/*
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* First see if we want to change our options to the old
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* forms because we have received old forms from the peer.
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*/
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if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
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/* use the old style of address negotiation */
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go->neg_addr = 1;
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go->old_addrs = 1;
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}
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if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
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/* try an older style of VJ negotiation */
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if (cis_received[f->unit] == 0) {
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/* keep trying the new style until we see some CI from the peer */
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go->neg_vj = 1;
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} else {
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/* use the old style only if the peer did */
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if (ho->neg_vj && ho->old_vj) {
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go->neg_vj = 1;
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go->old_vj = 1;
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go->vj_protocol = ho->vj_protocol;
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}
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}
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}
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ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
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go->old_addrs, go->ouraddr, go->hisaddr);
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ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
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go->maxslotindex, go->cflag);
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*lenp -= len;
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}
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/*
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* ipcp_ackci - Ack our CIs.
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*
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* Returns:
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* 0 - Ack was bad.
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* 1 - Ack was good.
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*/
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static int
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ipcp_ackci(f, p, len)
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fsm *f;
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u_char *p;
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int len;
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{
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ipcp_options *go = &ipcp_gotoptions[f->unit];
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u_short cilen, citype, cishort;
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u_long cilong;
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u_char cimaxslotindex, cicflag;
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/*
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* CIs must be in exactly the same order that we sent...
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* Check packet length and CI length at each step.
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* If we find any deviations, then this packet is bad.
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*/
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#define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
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if (neg) { \
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int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
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if ((len -= vjlen) < 0) \
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goto bad; \
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GETCHAR(citype, p); \
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GETCHAR(cilen, p); \
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if (cilen != vjlen || \
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citype != opt) \
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goto bad; \
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GETSHORT(cishort, p); \
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if (cishort != val) \
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goto bad; \
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if (!old) { \
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GETCHAR(cimaxslotindex, p); \
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if (cimaxslotindex != maxslotindex) \
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goto bad; \
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GETCHAR(cicflag, p); \
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if (cicflag != cflag) \
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goto bad; \
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} \
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}
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#define ACKCIADDR(opt, neg, old, val1, val2) \
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if (neg) { \
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int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
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u_long l; \
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if ((len -= addrlen) < 0) \
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goto bad; \
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GETCHAR(citype, p); \
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GETCHAR(cilen, p); \
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if (cilen != addrlen || \
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citype != opt) \
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goto bad; \
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GETLONG(l, p); \
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cilong = htonl(l); \
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if (val1 != cilong) \
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goto bad; \
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if (old) { \
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GETLONG(l, p); \
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cilong = htonl(l); \
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if (val2 != cilong) \
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goto bad; \
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} \
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}
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ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
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go->old_addrs, go->ouraddr, go->hisaddr);
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ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
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go->maxslotindex, go->cflag);
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/*
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* If there are any remaining CIs, then this packet is bad.
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*/
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if (len != 0)
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goto bad;
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return (1);
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bad:
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IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!"));
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return (0);
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}
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/*
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* ipcp_nakci - Peer has sent a NAK for some of our CIs.
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* This should not modify any state if the Nak is bad
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* or if IPCP is in the OPENED state.
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*
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* Returns:
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* 0 - Nak was bad.
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* 1 - Nak was good.
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*/
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static int
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ipcp_nakci(f, p, len)
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fsm *f;
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u_char *p;
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int len;
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{
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ipcp_options *go = &ipcp_gotoptions[f->unit];
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u_char cimaxslotindex, cicflag;
|
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u_char citype, cilen, *next;
|
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u_short cishort;
|
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u_long ciaddr1, ciaddr2, l;
|
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ipcp_options no; /* options we've seen Naks for */
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ipcp_options try; /* options to request next time */
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|
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BZERO(&no, sizeof(no));
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try = *go;
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|
|
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/*
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* Any Nak'd CIs must be in exactly the same order that we sent.
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* Check packet length and CI length at each step.
|
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* If we find any deviations, then this packet is bad.
|
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*/
|
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#define NAKCIADDR(opt, neg, old, code) \
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if (go->neg && \
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len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
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p[1] == cilen && \
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p[0] == opt) { \
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len -= cilen; \
|
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INCPTR(2, p); \
|
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GETLONG(l, p); \
|
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ciaddr1 = htonl(l); \
|
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if (old) { \
|
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GETLONG(l, p); \
|
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ciaddr2 = htonl(l); \
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no.old_addrs = 1; \
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} else \
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ciaddr2 = 0; \
|
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no.neg = 1; \
|
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code \
|
|
}
|
|
|
|
#define NAKCIVJ(opt, neg, code) \
|
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if (go->neg && \
|
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((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
|
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len >= cilen && \
|
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p[0] == opt) { \
|
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len -= cilen; \
|
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INCPTR(2, p); \
|
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GETSHORT(cishort, p); \
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no.neg = 1; \
|
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code \
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}
|
|
|
|
/*
|
|
* Accept the peer's idea of {our,his} address, if different
|
|
* from our idea, only if the accept_{local,remote} flag is set.
|
|
*/
|
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NAKCIADDR(CI_ADDR, neg_addr, go->old_addrs,
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if (go->accept_local && ciaddr1) { /* Do we know our address? */
|
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try.ouraddr = ciaddr1;
|
|
IPCPDEBUG((LOG_INFO, "local IP address %s",
|
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ip_ntoa(ciaddr1)));
|
|
}
|
|
if (go->accept_remote && ciaddr2) { /* Does he know his? */
|
|
try.hisaddr = ciaddr2;
|
|
IPCPDEBUG((LOG_INFO, "remote IP address %s",
|
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ip_ntoa(ciaddr2)));
|
|
}
|
|
);
|
|
|
|
/*
|
|
* Accept the peer's value of maxslotindex provided that it
|
|
* is less than what we asked for. Turn off slot-ID compression
|
|
* if the peer wants. Send old-style compress-type option if
|
|
* the peer wants.
|
|
*/
|
|
NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
|
|
if (cilen == CILEN_VJ) {
|
|
GETCHAR(cimaxslotindex, p);
|
|
GETCHAR(cicflag, p);
|
|
if (cishort == IPCP_VJ_COMP) {
|
|
try.old_vj = 0;
|
|
if (cimaxslotindex < go->maxslotindex)
|
|
try.maxslotindex = cimaxslotindex;
|
|
if (!cicflag)
|
|
try.cflag = 0;
|
|
} else {
|
|
try.neg_vj = 0;
|
|
}
|
|
} else {
|
|
if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
|
|
try.old_vj = 1;
|
|
try.vj_protocol = cishort;
|
|
} else {
|
|
try.neg_vj = 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 they want to negotiate about IP addresses, we comply.
|
|
* If they want us to ask for compression, we refuse.
|
|
*/
|
|
while (len > CILEN_VOID) {
|
|
GETCHAR(citype, p);
|
|
GETCHAR(cilen, p);
|
|
if( (len -= cilen) < 0 )
|
|
goto bad;
|
|
next = p + cilen - 2;
|
|
|
|
switch (citype) {
|
|
case CI_COMPRESSTYPE:
|
|
if (go->neg_vj || no.neg_vj ||
|
|
(cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
|
|
goto bad;
|
|
no.neg_vj = 1;
|
|
break;
|
|
case CI_ADDRS:
|
|
if (go->neg_addr && go->old_addrs || no.old_addrs
|
|
|| cilen != CILEN_ADDRS)
|
|
goto bad;
|
|
try.neg_addr = 1;
|
|
try.old_addrs = 1;
|
|
GETLONG(l, p);
|
|
ciaddr1 = htonl(l);
|
|
if (ciaddr1 && go->accept_local)
|
|
try.ouraddr = ciaddr1;
|
|
GETLONG(l, p);
|
|
ciaddr2 = htonl(l);
|
|
if (ciaddr2 && go->accept_remote)
|
|
try.hisaddr = ciaddr2;
|
|
no.old_addrs = 1;
|
|
break;
|
|
case CI_ADDR:
|
|
if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
|
|
goto bad;
|
|
try.neg_addr = 1;
|
|
try.old_addrs = 0;
|
|
GETLONG(l, p);
|
|
ciaddr1 = htonl(l);
|
|
if (ciaddr1 && go->accept_local)
|
|
try.ouraddr = ciaddr1;
|
|
no.neg_addr = 1;
|
|
break;
|
|
default:
|
|
goto bad;
|
|
}
|
|
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)
|
|
*go = try;
|
|
|
|
return 1;
|
|
|
|
bad:
|
|
IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!"));
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* ipcp_rejci - Reject some of our CIs.
|
|
*/
|
|
static int
|
|
ipcp_rejci(f, p, len)
|
|
fsm *f;
|
|
u_char *p;
|
|
int len;
|
|
{
|
|
ipcp_options *go = &ipcp_gotoptions[f->unit];
|
|
u_char cimaxslotindex, ciflag, cilen;
|
|
u_short cishort;
|
|
u_long cilong;
|
|
ipcp_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 REJCIADDR(opt, neg, old, val1, val2) \
|
|
if (go->neg && \
|
|
len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
|
|
p[1] == cilen && \
|
|
p[0] == opt) { \
|
|
u_long l; \
|
|
len -= cilen; \
|
|
INCPTR(2, p); \
|
|
GETLONG(l, p); \
|
|
cilong = htonl(l); \
|
|
/* Check rejected value. */ \
|
|
if (cilong != val1) \
|
|
goto bad; \
|
|
if (old) { \
|
|
GETLONG(l, p); \
|
|
cilong = htonl(l); \
|
|
/* Check rejected value. */ \
|
|
if (cilong != val2) \
|
|
goto bad; \
|
|
} \
|
|
try.neg = 0; \
|
|
}
|
|
|
|
#define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
|
|
if (go->neg && \
|
|
p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
|
|
len >= p[1] && \
|
|
p[0] == opt) { \
|
|
len -= p[1]; \
|
|
INCPTR(2, p); \
|
|
GETSHORT(cishort, p); \
|
|
/* Check rejected value. */ \
|
|
if (cishort != val) \
|
|
goto bad; \
|
|
if (!old) { \
|
|
GETCHAR(cimaxslotindex, p); \
|
|
if (cimaxslotindex != maxslot) \
|
|
goto bad; \
|
|
GETCHAR(ciflag, p); \
|
|
if (ciflag != cflag) \
|
|
goto bad; \
|
|
} \
|
|
try.neg = 0; \
|
|
}
|
|
|
|
REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
|
|
go->old_addrs, go->ouraddr, go->hisaddr);
|
|
|
|
REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
|
|
go->maxslotindex, go->cflag);
|
|
|
|
/*
|
|
* 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:
|
|
IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!"));
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* ipcp_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
|
|
ipcp_reqci(f, inp, len, reject_if_disagree)
|
|
fsm *f;
|
|
u_char *inp; /* Requested CIs */
|
|
int *len; /* Length of requested CIs */
|
|
int reject_if_disagree;
|
|
{
|
|
ipcp_options *wo = &ipcp_wantoptions[f->unit];
|
|
ipcp_options *ho = &ipcp_hisoptions[f->unit];
|
|
ipcp_options *ao = &ipcp_allowoptions[f->unit];
|
|
ipcp_options *go = &ipcp_gotoptions[f->unit];
|
|
u_char *cip, *next; /* Pointer to current and next CIs */
|
|
u_short cilen, citype; /* Parsed len, type */
|
|
u_short cishort; /* Parsed short value */
|
|
u_long tl, ciaddr1, ciaddr2;/* Parsed address values */
|
|
int rc = CONFACK; /* Final packet return code */
|
|
int orc; /* Individual option return code */
|
|
u_char *p; /* Pointer to next char to parse */
|
|
u_char *ucp = inp; /* Pointer to current output char */
|
|
int l = *len; /* Length left */
|
|
u_char maxslotindex, cflag;
|
|
|
|
/*
|
|
* Reset all his options.
|
|
*/
|
|
BZERO(ho, sizeof(*ho));
|
|
|
|
/*
|
|
* Process all his options.
|
|
*/
|
|
next = 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? */
|
|
IPCPDEBUG((LOG_INFO, "ipcp_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_ADDRS:
|
|
IPCPDEBUG((LOG_INFO, "ipcp: received ADDRS "));
|
|
if (!ao->neg_addr ||
|
|
cilen != CILEN_ADDRS) { /* Check CI length */
|
|
orc = CONFREJ; /* Reject CI */
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If he has no address, or if we both have his address but
|
|
* disagree about it, then NAK it with our idea.
|
|
* In particular, if we don't know his address, but he does,
|
|
* then accept it.
|
|
*/
|
|
GETLONG(tl, p); /* Parse source address (his) */
|
|
ciaddr1 = htonl(tl);
|
|
IPCPDEBUG((LOG_INFO, "(%s:", ip_ntoa(ciaddr1)));
|
|
if (ciaddr1 != wo->hisaddr
|
|
&& (ciaddr1 == 0 || !wo->accept_remote)) {
|
|
orc = CONFNAK;
|
|
if (!reject_if_disagree) {
|
|
DECPTR(sizeof (long), p);
|
|
tl = ntohl(wo->hisaddr);
|
|
PUTLONG(tl, p);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If he doesn't know our address, or if we both have our address
|
|
* but disagree about it, then NAK it with our idea.
|
|
*/
|
|
GETLONG(tl, p); /* Parse desination address (ours) */
|
|
ciaddr2 = htonl(tl);
|
|
IPCPDEBUG((LOG_INFO, "%s)", ip_ntoa(ciaddr2)));
|
|
if (ciaddr2 != wo->ouraddr) {
|
|
if (ciaddr2 == 0 || !wo->accept_local) {
|
|
orc = CONFNAK;
|
|
if (!reject_if_disagree) {
|
|
DECPTR(sizeof (long), p);
|
|
tl = ntohl(wo->ouraddr);
|
|
PUTLONG(tl, p);
|
|
}
|
|
} else {
|
|
go->ouraddr = ciaddr2; /* accept peer's idea */
|
|
}
|
|
}
|
|
|
|
ho->neg_addr = 1;
|
|
ho->old_addrs = 1;
|
|
ho->hisaddr = ciaddr1;
|
|
ho->ouraddr = ciaddr2;
|
|
break;
|
|
|
|
case CI_ADDR:
|
|
IPCPDEBUG((LOG_INFO, "ipcp: received ADDR "));
|
|
|
|
if (!ao->neg_addr ||
|
|
cilen != CILEN_ADDR) { /* Check CI length */
|
|
orc = CONFREJ; /* Reject CI */
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If he has no address, or if we both have his address but
|
|
* disagree about it, then NAK it with our idea.
|
|
* In particular, if we don't know his address, but he does,
|
|
* then accept it.
|
|
*/
|
|
GETLONG(tl, p); /* Parse source address (his) */
|
|
ciaddr1 = htonl(tl);
|
|
IPCPDEBUG((LOG_INFO, "(%s)", ip_ntoa(ciaddr1)));
|
|
if (ciaddr1 != wo->hisaddr
|
|
&& (ciaddr1 == 0 || !wo->accept_remote)) {
|
|
orc = CONFNAK;
|
|
if (!reject_if_disagree) {
|
|
DECPTR(sizeof (long), p);
|
|
tl = ntohl(wo->hisaddr);
|
|
PUTLONG(tl, p);
|
|
}
|
|
}
|
|
|
|
ho->neg_addr = 1;
|
|
ho->hisaddr = ciaddr1;
|
|
break;
|
|
|
|
case CI_COMPRESSTYPE:
|
|
IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE "));
|
|
if (!ao->neg_vj ||
|
|
(cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
GETSHORT(cishort, p);
|
|
IPCPDEBUG((LOG_INFO, "(%d)", cishort));
|
|
|
|
if (!(cishort == IPCP_VJ_COMP ||
|
|
(cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
ho->neg_vj = 1;
|
|
ho->vj_protocol = cishort;
|
|
if (cilen == CILEN_VJ) {
|
|
GETCHAR(maxslotindex, p);
|
|
if (maxslotindex > ao->maxslotindex) {
|
|
orc = CONFNAK;
|
|
if (!reject_if_disagree){
|
|
DECPTR(1, p);
|
|
PUTCHAR(ao->maxslotindex, p);
|
|
}
|
|
}
|
|
GETCHAR(cflag, p);
|
|
if (cflag && !ao->cflag) {
|
|
orc = CONFNAK;
|
|
if (!reject_if_disagree){
|
|
DECPTR(1, p);
|
|
PUTCHAR(wo->cflag, p);
|
|
}
|
|
}
|
|
ho->maxslotindex = maxslotindex;
|
|
ho->cflag = wo->cflag;
|
|
} else {
|
|
ho->old_vj = 1;
|
|
ho->maxslotindex = MAX_STATES - 1;
|
|
ho->cflag = 1;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
orc = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
endswitch:
|
|
IPCPDEBUG((LOG_INFO, " (%s)\n", 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? */
|
|
orc = CONFREJ; /* Get tough if so */
|
|
else {
|
|
if (rc == CONFREJ) /* Rejecting prior CI? */
|
|
continue; /* Don't send this one */
|
|
if (rc == CONFACK) { /* Ack'd all prior CIs? */
|
|
rc = CONFNAK; /* Not anymore... */
|
|
ucp = inp; /* Backup */
|
|
}
|
|
}
|
|
}
|
|
|
|
if (orc == CONFREJ && /* Reject this CI */
|
|
rc != CONFREJ) { /* but no prior ones? */
|
|
rc = CONFREJ;
|
|
ucp = inp; /* Backup */
|
|
}
|
|
|
|
/* Need to move CI? */
|
|
if (ucp != cip)
|
|
BCOPY(cip, ucp, cilen); /* Move it */
|
|
|
|
/* Update output pointer */
|
|
INCPTR(cilen, ucp);
|
|
}
|
|
|
|
/*
|
|
* If we aren't rejecting this packet, and we want to negotiate
|
|
* their address, and they didn't send their address, then we
|
|
* send a NAK with a CI_ADDR option appended. We assume the
|
|
* input buffer is long enough that we can append the extra
|
|
* option safely.
|
|
*/
|
|
if (rc != CONFREJ && !ho->neg_addr &&
|
|
wo->req_addr && !reject_if_disagree) {
|
|
if (rc == CONFACK) {
|
|
rc = CONFNAK;
|
|
ucp = inp; /* reset pointer */
|
|
wo->req_addr = 0; /* don't ask again */
|
|
}
|
|
PUTCHAR(CI_ADDR, ucp);
|
|
PUTCHAR(CILEN_ADDR, ucp);
|
|
tl = ntohl(wo->hisaddr);
|
|
PUTLONG(tl, ucp);
|
|
}
|
|
|
|
*len = ucp - inp; /* Compute output length */
|
|
IPCPDEBUG((LOG_INFO, "ipcp: returning Configure-%s", CODENAME(rc)));
|
|
return (rc); /* Return final code */
|
|
}
|
|
|
|
|
|
/*
|
|
* ipcp_up - IPCP has come UP.
|
|
*
|
|
* Configure the IP network interface appropriately and bring it up.
|
|
*/
|
|
static void
|
|
ipcp_up(f)
|
|
fsm *f;
|
|
{
|
|
u_long mask;
|
|
ipcp_options *ho = &ipcp_hisoptions[f->unit];
|
|
ipcp_options *go = &ipcp_gotoptions[f->unit];
|
|
|
|
IPCPDEBUG((LOG_INFO, "ipcp: up"));
|
|
go->default_route = 0;
|
|
go->proxy_arp = 0;
|
|
|
|
/*
|
|
* We must have a non-zero IP address for both ends of the link.
|
|
*/
|
|
if (!ho->neg_addr)
|
|
ho->hisaddr = ipcp_wantoptions[f->unit].hisaddr;
|
|
|
|
if (ho->hisaddr == 0) {
|
|
syslog(LOG_ERR, "Could not determine remote IP address");
|
|
ipcp_close(f->unit);
|
|
return;
|
|
}
|
|
if (go->ouraddr == 0) {
|
|
syslog(LOG_ERR, "Could not determine local IP address");
|
|
ipcp_close(f->unit);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Check that the peer is allowed to use the IP address it wants.
|
|
*/
|
|
if (!auth_ip_addr(f->unit, ho->hisaddr)) {
|
|
syslog(LOG_ERR, "Peer is not authorized to use remote address %s",
|
|
ip_ntoa(ho->hisaddr));
|
|
ipcp_close(f->unit);
|
|
return;
|
|
}
|
|
|
|
syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(go->ouraddr));
|
|
syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr));
|
|
|
|
/*
|
|
* Set IP addresses and (if specified) netmask.
|
|
*/
|
|
mask = GetMask(go->ouraddr);
|
|
if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
|
|
IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
|
|
ipcp_close(f->unit);
|
|
return;
|
|
}
|
|
|
|
/* set tcp compression */
|
|
sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
|
|
|
|
/* bring the interface up for IP */
|
|
if (!sifup(f->unit)) {
|
|
IPCPDEBUG((LOG_WARNING, "sifup failed"));
|
|
ipcp_close(f->unit);
|
|
return;
|
|
}
|
|
|
|
/* assign a default route through the interface if required */
|
|
if (ipcp_wantoptions[f->unit].default_route)
|
|
if (sifdefaultroute(f->unit, ho->hisaddr))
|
|
go->default_route = 1;
|
|
|
|
/* Make a proxy ARP entry if requested. */
|
|
if (ipcp_wantoptions[f->unit].proxy_arp)
|
|
if (sifproxyarp(f->unit, ho->hisaddr))
|
|
go->proxy_arp = 1;
|
|
|
|
/*
|
|
* Execute the ip-up script, like this:
|
|
* /etc/ppp/ip-up interface tty speed local-IP remote-IP
|
|
*/
|
|
ipcp_script(f, _PATH_IPUP);
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* ipcp_down - IPCP has gone DOWN.
|
|
*
|
|
* Take the IP network interface down, clear its addresses
|
|
* and delete routes through it.
|
|
*/
|
|
static void
|
|
ipcp_down(f)
|
|
fsm *f;
|
|
{
|
|
u_long ouraddr, hisaddr;
|
|
|
|
IPCPDEBUG((LOG_INFO, "ipcp: down"));
|
|
|
|
ouraddr = ipcp_gotoptions[f->unit].ouraddr;
|
|
hisaddr = ipcp_hisoptions[f->unit].hisaddr;
|
|
if (ipcp_gotoptions[f->unit].proxy_arp)
|
|
cifproxyarp(f->unit, hisaddr);
|
|
if (ipcp_gotoptions[f->unit].default_route)
|
|
cifdefaultroute(f->unit, hisaddr);
|
|
sifdown(f->unit);
|
|
cifaddr(f->unit, ouraddr, hisaddr);
|
|
|
|
/* Execute the ip-down script */
|
|
ipcp_script(f, _PATH_IPDOWN);
|
|
}
|
|
|
|
|
|
/*
|
|
* ipcp_script - Execute a script with arguments
|
|
* interface-name tty-name speed local-IP remote-IP.
|
|
*/
|
|
static void
|
|
ipcp_script(f, script)
|
|
fsm *f;
|
|
char *script;
|
|
{
|
|
char strspeed[32], strlocal[32], strremote[32];
|
|
char *argv[8];
|
|
|
|
sprintf(strspeed, "%d", baud_rate);
|
|
strcpy(strlocal, ip_ntoa(ipcp_gotoptions[f->unit].ouraddr));
|
|
strcpy(strremote, ip_ntoa(ipcp_hisoptions[f->unit].hisaddr));
|
|
|
|
argv[0] = script;
|
|
argv[1] = ifname;
|
|
argv[2] = devname;
|
|
argv[3] = strspeed;
|
|
argv[4] = strlocal;
|
|
argv[5] = strremote;
|
|
argv[6] = NULL;
|
|
run_program(script, argv, 0);
|
|
}
|
|
|
|
/*
|
|
* ipcp_printpkt - print the contents of an IPCP packet.
|
|
*/
|
|
char *ipcp_codenames[] = {
|
|
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
|
|
"TermReq", "TermAck", "CodeRej"
|
|
};
|
|
|
|
int
|
|
ipcp_printpkt(p, plen, printer, arg)
|
|
u_char *p;
|
|
int plen;
|
|
void (*printer)();
|
|
void *arg;
|
|
{
|
|
int code, id, len, olen;
|
|
u_char *pstart, *optend;
|
|
u_short cishort;
|
|
u_long 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(ipcp_codenames) / sizeof(char *))
|
|
printer(arg, " %s", ipcp_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_ADDRS:
|
|
if (olen == CILEN_ADDRS) {
|
|
p += 2;
|
|
GETLONG(cilong, p);
|
|
printer(arg, "addrs %s", ip_ntoa(htonl(cilong)));
|
|
GETLONG(cilong, p);
|
|
printer(arg, " %s", ip_ntoa(htonl(cilong)));
|
|
}
|
|
break;
|
|
case CI_COMPRESSTYPE:
|
|
if (olen >= CILEN_COMPRESS) {
|
|
p += 2;
|
|
GETSHORT(cishort, p);
|
|
printer(arg, "compress ");
|
|
switch (cishort) {
|
|
case IPCP_VJ_COMP:
|
|
printer(arg, "VJ");
|
|
break;
|
|
case IPCP_VJ_COMP_OLD:
|
|
printer(arg, "old-VJ");
|
|
break;
|
|
default:
|
|
printer(arg, "0x%x", cishort);
|
|
}
|
|
}
|
|
break;
|
|
case CI_ADDR:
|
|
if (olen == CILEN_ADDR) {
|
|
p += 2;
|
|
GETLONG(cilong, p);
|
|
printer(arg, "addr %s", ip_ntoa(htonl(cilong)));
|
|
}
|
|
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;
|
|
}
|