a65dba1221
24 (which is magnalink!) rather than the correct (according to the rfc) 26. Initial attempt at a compatability kludge that will negotiate for either but will prefer to use the correct deflate compression type.
1209 lines
29 KiB
C
1209 lines
29 KiB
C
/*
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* ccp.c - PPP Compression Control Protocol.
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*
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* Copyright (c) 1994 The Australian National University.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, provided that the above copyright
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* notice appears in all copies. This software is provided without any
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* warranty, express or implied. The Australian National University
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* makes no representations about the suitability of this software for
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* any purpose.
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*
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* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
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* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
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* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
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* OR MODIFICATIONS.
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*/
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#ifndef lint
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static char rcsid[] = "$Id: ccp.c,v 1.7 1997/08/19 17:52:33 peter Exp $";
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#endif
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#include <string.h>
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#include <syslog.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <net/ppp_defs.h>
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#include <net/ppp_comp.h>
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#include "pppd.h"
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#include "fsm.h"
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#include "ccp.h"
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/*
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* Protocol entry points from main code.
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*/
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static void ccp_init __P((int unit));
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static void ccp_open __P((int unit));
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static void ccp_close __P((int unit, char *));
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static void ccp_lowerup __P((int unit));
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static void ccp_lowerdown __P((int));
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static void ccp_input __P((int unit, u_char *pkt, int len));
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static void ccp_protrej __P((int unit));
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static int ccp_printpkt __P((u_char *pkt, int len,
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void (*printer) __P((void *, char *, ...)),
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void *arg));
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static void ccp_datainput __P((int unit, u_char *pkt, int len));
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struct protent ccp_protent = {
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PPP_CCP,
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ccp_init,
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ccp_input,
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ccp_protrej,
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ccp_lowerup,
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ccp_lowerdown,
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ccp_open,
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ccp_close,
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ccp_printpkt,
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ccp_datainput,
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1,
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"CCP",
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NULL,
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NULL,
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NULL
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};
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fsm ccp_fsm[NUM_PPP];
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ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
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ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
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ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
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ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
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/*
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* Callbacks for fsm code.
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*/
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static void ccp_resetci __P((fsm *));
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static int ccp_cilen __P((fsm *));
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static void ccp_addci __P((fsm *, u_char *, int *));
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static int ccp_ackci __P((fsm *, u_char *, int));
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static int ccp_nakci __P((fsm *, u_char *, int));
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static int ccp_rejci __P((fsm *, u_char *, int));
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static int ccp_reqci __P((fsm *, u_char *, int *, int));
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static void ccp_up __P((fsm *));
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static void ccp_down __P((fsm *));
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static int ccp_extcode __P((fsm *, int, int, u_char *, int));
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static void ccp_rack_timeout __P((void *));
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static char *method_name __P((ccp_options *, ccp_options *));
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static fsm_callbacks ccp_callbacks = {
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ccp_resetci,
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ccp_cilen,
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ccp_addci,
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ccp_ackci,
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ccp_nakci,
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ccp_rejci,
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ccp_reqci,
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ccp_up,
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ccp_down,
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NULL,
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NULL,
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NULL,
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NULL,
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ccp_extcode,
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"CCP"
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};
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/*
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* Do we want / did we get any compression?
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*/
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#ifdef CI_BADDEFLATE
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#define ANY_COMPRESS(opt) ((opt).deflate || (opt).baddeflate \
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|| (opt).bsd_compress \
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|| (opt).predictor_1 || (opt).predictor_2)
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#else
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#define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
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|| (opt).predictor_1 || (opt).predictor_2)
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#endif
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/*
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* Local state (mainly for handling reset-reqs and reset-acks).
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*/
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static int ccp_localstate[NUM_PPP];
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#define RACK_PENDING 1 /* waiting for reset-ack */
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#define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
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#define RACKTIMEOUT 1 /* second */
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static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
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/*
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* ccp_init - initialize CCP.
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*/
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static void
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ccp_init(unit)
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int unit;
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{
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fsm *f = &ccp_fsm[unit];
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f->unit = unit;
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f->protocol = PPP_CCP;
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f->callbacks = &ccp_callbacks;
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fsm_init(f);
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memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
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memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
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memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
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memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
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ccp_wantoptions[0].deflate = 1;
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ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
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ccp_allowoptions[0].deflate = 1;
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ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
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#ifdef CI_BADDEFLATE
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ccp_wantoptions[0].baddeflate = 1;
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ccp_wantoptions[0].baddeflate_size = DEFLATE_MAX_SIZE;
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ccp_allowoptions[0].baddeflate = 1;
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ccp_allowoptions[0].baddeflate_size = DEFLATE_MAX_SIZE;
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#endif
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ccp_wantoptions[0].bsd_compress = 1;
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ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
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ccp_allowoptions[0].bsd_compress = 1;
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ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
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ccp_allowoptions[0].predictor_1 = 1;
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}
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/*
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* ccp_open - CCP is allowed to come up.
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*/
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static void
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ccp_open(unit)
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int unit;
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{
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fsm *f = &ccp_fsm[unit];
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if (f->state != OPENED)
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ccp_flags_set(unit, 1, 0);
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/*
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* Find out which compressors the kernel supports before
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* deciding whether to open in silent mode.
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*/
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ccp_resetci(f);
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if (!ANY_COMPRESS(ccp_gotoptions[unit]))
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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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* ccp_close - Terminate CCP.
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*/
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static void
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ccp_close(unit, reason)
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int unit;
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char *reason;
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{
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ccp_flags_set(unit, 0, 0);
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fsm_close(&ccp_fsm[unit], reason);
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}
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/*
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* ccp_lowerup - we may now transmit CCP packets.
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*/
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static void
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ccp_lowerup(unit)
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int unit;
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{
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fsm_lowerup(&ccp_fsm[unit]);
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}
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/*
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* ccp_lowerdown - we may not transmit CCP packets.
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*/
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static void
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ccp_lowerdown(unit)
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int unit;
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{
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fsm_lowerdown(&ccp_fsm[unit]);
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}
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/*
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* ccp_input - process a received CCP packet.
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*/
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static void
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ccp_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 = &ccp_fsm[unit];
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int oldstate;
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/*
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* Check for a terminate-request so we can print a message.
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*/
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oldstate = f->state;
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fsm_input(f, p, len);
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if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED)
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syslog(LOG_NOTICE, "Compression disabled by peer.");
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/*
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* If we get a terminate-ack and we're not asking for compression,
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* close CCP.
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*/
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if (oldstate == REQSENT && p[0] == TERMACK
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&& !ANY_COMPRESS(ccp_gotoptions[unit]))
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ccp_close(unit, "No compression negotiated");
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}
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/*
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* Handle a CCP-specific code.
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*/
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static int
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ccp_extcode(f, code, id, p, len)
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fsm *f;
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int code, id;
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u_char *p;
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int len;
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{
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switch (code) {
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case CCP_RESETREQ:
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if (f->state != OPENED)
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break;
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/* send a reset-ack, which the transmitter will see and
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reset its compression state. */
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fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
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break;
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case CCP_RESETACK:
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if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
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ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
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UNTIMEOUT(ccp_rack_timeout, f);
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}
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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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* ccp_protrej - peer doesn't talk CCP.
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*/
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static void
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ccp_protrej(unit)
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int unit;
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{
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ccp_flags_set(unit, 0, 0);
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fsm_lowerdown(&ccp_fsm[unit]);
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}
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/*
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* ccp_resetci - initialize at start of negotiation.
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*/
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static void
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ccp_resetci(f)
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fsm *f;
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{
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ccp_options *go = &ccp_gotoptions[f->unit];
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u_char opt_buf[16];
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*go = ccp_wantoptions[f->unit];
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all_rejected[f->unit] = 0;
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/*
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* Check whether the kernel knows about the various
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* compression methods we might request.
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*/
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if (go->bsd_compress) {
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opt_buf[0] = CI_BSD_COMPRESS;
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opt_buf[1] = CILEN_BSD_COMPRESS;
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opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
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if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
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go->bsd_compress = 0;
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}
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if (go->deflate) {
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opt_buf[0] = CI_DEFLATE;
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opt_buf[1] = CILEN_DEFLATE;
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opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_SIZE);
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opt_buf[3] = DEFLATE_CHK_SEQUENCE;
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if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
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go->deflate = 0;
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}
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#ifdef CI_BADDEFLATE
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if (go->baddeflate) {
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opt_buf[0] = CI_BADDEFLATE;
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opt_buf[1] = CILEN_DEFLATE;
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opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_SIZE);
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opt_buf[3] = DEFLATE_CHK_SEQUENCE;
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if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
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go->baddeflate = 0;
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}
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#endif
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if (go->predictor_1) {
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opt_buf[0] = CI_PREDICTOR_1;
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opt_buf[1] = CILEN_PREDICTOR_1;
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if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
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go->predictor_1 = 0;
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}
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if (go->predictor_2) {
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opt_buf[0] = CI_PREDICTOR_2;
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opt_buf[1] = CILEN_PREDICTOR_2;
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if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
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go->predictor_2 = 0;
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}
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}
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/*
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* ccp_cilen - Return total length of our configuration info.
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*/
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static int
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ccp_cilen(f)
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fsm *f;
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{
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ccp_options *go = &ccp_gotoptions[f->unit];
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return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
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+ (go->deflate? CILEN_DEFLATE: 0)
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#ifdef CI_BADDEFLATE
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+ (go->baddeflate? CILEN_DEFLATE: 0)
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#endif
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+ (go->predictor_1? CILEN_PREDICTOR_1: 0)
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+ (go->predictor_2? CILEN_PREDICTOR_2: 0);
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}
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/*
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* ccp_addci - put our requests in a packet.
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*/
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static void
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ccp_addci(f, p, lenp)
|
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fsm *f;
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u_char *p;
|
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int *lenp;
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{
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int res;
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ccp_options *go = &ccp_gotoptions[f->unit];
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u_char *p0 = p;
|
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|
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/*
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* Add the compression types that we can receive, in decreasing
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* preference order. Get the kernel to allocate the first one
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* in case it gets Acked.
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*/
|
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if (go->deflate) {
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p[0] = CI_DEFLATE;
|
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p[1] = CILEN_DEFLATE;
|
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p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
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p[3] = DEFLATE_CHK_SEQUENCE;
|
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for (;;) {
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res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
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if (res > 0) {
|
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p += CILEN_DEFLATE;
|
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break;
|
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}
|
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if (res < 0 || go->deflate_size <= DEFLATE_MIN_SIZE) {
|
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go->deflate = 0;
|
|
break;
|
|
}
|
|
--go->deflate_size;
|
|
p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
|
|
}
|
|
}
|
|
#ifdef CI_BADDEFLATE
|
|
if (go->baddeflate) {
|
|
p[0] = CI_BADDEFLATE;
|
|
p[1] = CILEN_DEFLATE;
|
|
p[2] = DEFLATE_MAKE_OPT(go->baddeflate_size);
|
|
p[3] = DEFLATE_CHK_SEQUENCE;
|
|
if (p != p0) {
|
|
p += CILEN_DEFLATE; /* not the first option */
|
|
} else {
|
|
for (;;) {
|
|
res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
|
|
if (res > 0) {
|
|
p += CILEN_DEFLATE;
|
|
break;
|
|
}
|
|
if (res < 0 || go->baddeflate_size <= DEFLATE_MIN_SIZE) {
|
|
go->baddeflate = 0;
|
|
break;
|
|
}
|
|
--go->baddeflate_size;
|
|
p[2] = DEFLATE_MAKE_OPT(go->baddeflate_size);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
if (go->bsd_compress) {
|
|
p[0] = CI_BSD_COMPRESS;
|
|
p[1] = CILEN_BSD_COMPRESS;
|
|
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
|
|
if (p != p0) {
|
|
p += CILEN_BSD_COMPRESS; /* not the first option */
|
|
} else {
|
|
for (;;) {
|
|
res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
|
|
if (res > 0) {
|
|
p += CILEN_BSD_COMPRESS;
|
|
break;
|
|
}
|
|
if (res < 0 || go->bsd_bits <= BSD_MIN_BITS) {
|
|
go->bsd_compress = 0;
|
|
break;
|
|
}
|
|
--go->bsd_bits;
|
|
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
|
|
}
|
|
}
|
|
}
|
|
/* XXX Should Predictor 2 be preferable to Predictor 1? */
|
|
if (go->predictor_1) {
|
|
p[0] = CI_PREDICTOR_1;
|
|
p[1] = CILEN_PREDICTOR_1;
|
|
if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
|
|
go->predictor_1 = 0;
|
|
} else {
|
|
p += CILEN_PREDICTOR_1;
|
|
}
|
|
}
|
|
if (go->predictor_2) {
|
|
p[0] = CI_PREDICTOR_2;
|
|
p[1] = CILEN_PREDICTOR_2;
|
|
if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
|
|
go->predictor_2 = 0;
|
|
} else {
|
|
p += CILEN_PREDICTOR_2;
|
|
}
|
|
}
|
|
|
|
go->method = (p > p0)? p0[0]: -1;
|
|
|
|
*lenp = p - p0;
|
|
}
|
|
|
|
/*
|
|
* ccp_ackci - process a received configure-ack, and return
|
|
* 1 iff the packet was OK.
|
|
*/
|
|
static int
|
|
ccp_ackci(f, p, len)
|
|
fsm *f;
|
|
u_char *p;
|
|
int len;
|
|
{
|
|
ccp_options *go = &ccp_gotoptions[f->unit];
|
|
u_char *p0 = p;
|
|
|
|
if (go->deflate) {
|
|
if (len < CILEN_DEFLATE
|
|
|| p[0] != CI_DEFLATE || p[1] != CILEN_DEFLATE
|
|
|| p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE)
|
|
return 0;
|
|
p += CILEN_DEFLATE;
|
|
len -= CILEN_DEFLATE;
|
|
/* XXX Cope with first/fast ack */
|
|
if (len == 0)
|
|
return 1;
|
|
}
|
|
#ifdef CI_BADDEFLATE
|
|
if (go->baddeflate) {
|
|
if (len < CILEN_DEFLATE
|
|
|| p[0] != CI_BADDEFLATE || p[1] != CILEN_DEFLATE
|
|
|| p[2] != DEFLATE_MAKE_OPT(go->baddeflate_size)
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE)
|
|
return 0;
|
|
p += CILEN_DEFLATE;
|
|
len -= CILEN_DEFLATE;
|
|
/* XXX Cope with first/fast ack */
|
|
if (p == p0 && len == 0)
|
|
return 1;
|
|
}
|
|
#endif
|
|
if (go->bsd_compress) {
|
|
if (len < CILEN_BSD_COMPRESS
|
|
|| p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
|
|
|| p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
|
|
return 0;
|
|
p += CILEN_BSD_COMPRESS;
|
|
len -= CILEN_BSD_COMPRESS;
|
|
/* XXX Cope with first/fast ack */
|
|
if (p == p0 && len == 0)
|
|
return 1;
|
|
}
|
|
if (go->predictor_1) {
|
|
if (len < CILEN_PREDICTOR_1
|
|
|| p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
|
|
return 0;
|
|
p += CILEN_PREDICTOR_1;
|
|
len -= CILEN_PREDICTOR_1;
|
|
/* XXX Cope with first/fast ack */
|
|
if (p == p0 && len == 0)
|
|
return 1;
|
|
}
|
|
if (go->predictor_2) {
|
|
if (len < CILEN_PREDICTOR_2
|
|
|| p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
|
|
return 0;
|
|
p += CILEN_PREDICTOR_2;
|
|
len -= CILEN_PREDICTOR_2;
|
|
/* XXX Cope with first/fast ack */
|
|
if (p == p0 && len == 0)
|
|
return 1;
|
|
}
|
|
|
|
if (len != 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* ccp_nakci - process received configure-nak.
|
|
* Returns 1 iff the nak was OK.
|
|
*/
|
|
static int
|
|
ccp_nakci(f, p, len)
|
|
fsm *f;
|
|
u_char *p;
|
|
int len;
|
|
{
|
|
ccp_options *go = &ccp_gotoptions[f->unit];
|
|
ccp_options no; /* options we've seen already */
|
|
ccp_options try; /* options to ask for next time */
|
|
|
|
memset(&no, 0, sizeof(no));
|
|
try = *go;
|
|
|
|
if (go->deflate && len >= CILEN_DEFLATE
|
|
&& p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
|
|
no.deflate = 1;
|
|
/*
|
|
* Peer wants us to use a different code size or something.
|
|
* Stop asking for Deflate if we don't understand his suggestion.
|
|
*/
|
|
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
|
|
|| DEFLATE_SIZE(p[2]) < DEFLATE_MIN_SIZE
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE)
|
|
try.deflate = 0;
|
|
else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
|
|
try.deflate_size = DEFLATE_SIZE(p[2]);
|
|
p += CILEN_DEFLATE;
|
|
len -= CILEN_DEFLATE;
|
|
}
|
|
|
|
#ifdef CI_BADDEFLATE
|
|
if (go->baddeflate && len >= CILEN_DEFLATE
|
|
&& p[0] == CI_BADDEFLATE && p[1] == CILEN_DEFLATE) {
|
|
no.baddeflate = 1;
|
|
/*
|
|
* Peer wants us to use a different code size or something.
|
|
* Stop asking for Deflate if we don't understand his suggestion.
|
|
*/
|
|
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
|
|
|| DEFLATE_SIZE(p[2]) < DEFLATE_MIN_SIZE
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE)
|
|
try.baddeflate = 0;
|
|
else if (DEFLATE_SIZE(p[2]) < go->baddeflate_size)
|
|
try.baddeflate_size = DEFLATE_SIZE(p[2]);
|
|
p += CILEN_DEFLATE;
|
|
len -= CILEN_DEFLATE;
|
|
}
|
|
#endif
|
|
|
|
if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
|
|
&& p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
|
|
no.bsd_compress = 1;
|
|
/*
|
|
* Peer wants us to use a different number of bits
|
|
* or a different version.
|
|
*/
|
|
if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
|
|
try.bsd_compress = 0;
|
|
else if (BSD_NBITS(p[2]) < go->bsd_bits)
|
|
try.bsd_bits = BSD_NBITS(p[2]);
|
|
p += CILEN_BSD_COMPRESS;
|
|
len -= CILEN_BSD_COMPRESS;
|
|
}
|
|
|
|
/*
|
|
* Predictor-1 and 2 have no options, so they can't be Naked.
|
|
*
|
|
* XXX What should we do with any remaining options?
|
|
*/
|
|
|
|
if (len != 0)
|
|
return 0;
|
|
|
|
if (f->state != OPENED)
|
|
*go = try;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* ccp_rejci - reject some of our suggested compression methods.
|
|
*/
|
|
static int
|
|
ccp_rejci(f, p, len)
|
|
fsm *f;
|
|
u_char *p;
|
|
int len;
|
|
{
|
|
ccp_options *go = &ccp_gotoptions[f->unit];
|
|
ccp_options try; /* options to request next time */
|
|
|
|
try = *go;
|
|
|
|
/*
|
|
* Cope with empty configure-rejects by ceasing to send
|
|
* configure-requests.
|
|
*/
|
|
if (len == 0 && all_rejected[f->unit])
|
|
return -1;
|
|
|
|
if (go->deflate && len >= CILEN_DEFLATE
|
|
&& p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
|
|
if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE)
|
|
return 0; /* Rej is bad */
|
|
try.deflate = 0;
|
|
p += CILEN_DEFLATE;
|
|
len -= CILEN_DEFLATE;
|
|
}
|
|
#ifdef CI_BADDEFLATE
|
|
if (go->baddeflate && len >= CILEN_DEFLATE
|
|
&& p[0] == CI_BADDEFLATE && p[1] == CILEN_DEFLATE) {
|
|
if (p[2] != DEFLATE_MAKE_OPT(go->baddeflate_size)
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE)
|
|
return 0; /* Rej is bad */
|
|
try.baddeflate = 0;
|
|
p += CILEN_DEFLATE;
|
|
len -= CILEN_DEFLATE;
|
|
}
|
|
#endif
|
|
if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
|
|
&& p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
|
|
if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
|
|
return 0;
|
|
try.bsd_compress = 0;
|
|
p += CILEN_BSD_COMPRESS;
|
|
len -= CILEN_BSD_COMPRESS;
|
|
}
|
|
if (go->predictor_1 && len >= CILEN_PREDICTOR_1
|
|
&& p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
|
|
try.predictor_1 = 0;
|
|
p += CILEN_PREDICTOR_1;
|
|
len -= CILEN_PREDICTOR_1;
|
|
}
|
|
if (go->predictor_2 && len >= CILEN_PREDICTOR_2
|
|
&& p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
|
|
try.predictor_2 = 0;
|
|
p += CILEN_PREDICTOR_2;
|
|
len -= CILEN_PREDICTOR_2;
|
|
}
|
|
|
|
if (len != 0)
|
|
return 0;
|
|
|
|
if (f->state != OPENED)
|
|
*go = try;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* ccp_reqci - processed a received configure-request.
|
|
* Returns CONFACK, CONFNAK or CONFREJ and the packet modified
|
|
* appropriately.
|
|
*/
|
|
static int
|
|
ccp_reqci(f, p, lenp, dont_nak)
|
|
fsm *f;
|
|
u_char *p;
|
|
int *lenp;
|
|
int dont_nak;
|
|
{
|
|
int ret, newret, res;
|
|
u_char *p0, *retp;
|
|
int len, clen, type, nb;
|
|
ccp_options *ho = &ccp_hisoptions[f->unit];
|
|
ccp_options *ao = &ccp_allowoptions[f->unit];
|
|
|
|
ret = CONFACK;
|
|
retp = p0 = p;
|
|
len = *lenp;
|
|
|
|
memset(ho, 0, sizeof(ccp_options));
|
|
ho->method = (len > 0)? p[0]: -1;
|
|
|
|
while (len > 0) {
|
|
newret = CONFACK;
|
|
if (len < 2 || p[1] < 2 || p[1] > len) {
|
|
/* length is bad */
|
|
clen = len;
|
|
newret = CONFREJ;
|
|
|
|
} else {
|
|
type = p[0];
|
|
clen = p[1];
|
|
|
|
switch (type) {
|
|
case CI_DEFLATE:
|
|
if (!ao->deflate || clen != CILEN_DEFLATE) {
|
|
newret = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
ho->deflate = 1;
|
|
ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
|
|
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE
|
|
|| nb > ao->deflate_size || nb < DEFLATE_MIN_SIZE) {
|
|
newret = CONFNAK;
|
|
if (!dont_nak) {
|
|
p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
|
|
p[3] = DEFLATE_CHK_SEQUENCE;
|
|
/* fall through to test this #bits below */
|
|
} else
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check whether we can do Deflate with the window
|
|
* size they want. If the window is too big, reduce
|
|
* it until the kernel can cope and nak with that.
|
|
* We only check this for the first option.
|
|
*/
|
|
if (p == p0) {
|
|
for (;;) {
|
|
res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
|
|
if (res > 0)
|
|
break; /* it's OK now */
|
|
if (res < 0 || nb == DEFLATE_MIN_SIZE || dont_nak) {
|
|
newret = CONFREJ;
|
|
p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
|
|
break;
|
|
}
|
|
newret = CONFNAK;
|
|
--nb;
|
|
p[2] = DEFLATE_MAKE_OPT(nb);
|
|
}
|
|
}
|
|
break;
|
|
|
|
#ifdef CI_BADDEFLATE
|
|
case CI_BADDEFLATE:
|
|
if (!ao->baddeflate || clen != CILEN_DEFLATE) {
|
|
newret = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
ho->baddeflate = 1;
|
|
ho->baddeflate_size = nb = DEFLATE_SIZE(p[2]);
|
|
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
|
|
|| p[3] != DEFLATE_CHK_SEQUENCE
|
|
|| nb > ao->baddeflate_size || nb < DEFLATE_MIN_SIZE) {
|
|
newret = CONFNAK;
|
|
if (!dont_nak) {
|
|
p[2] = DEFLATE_MAKE_OPT(ao->baddeflate_size);
|
|
p[3] = DEFLATE_CHK_SEQUENCE;
|
|
/* fall through to test this #bits below */
|
|
} else
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check whether we can do Deflate with the window
|
|
* size they want. If the window is too big, reduce
|
|
* it until the kernel can cope and nak with that.
|
|
* We only check this for the first option.
|
|
*/
|
|
if (p == p0) {
|
|
for (;;) {
|
|
res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
|
|
if (res > 0)
|
|
break; /* it's OK now */
|
|
if (res < 0 || nb == DEFLATE_MIN_SIZE || dont_nak) {
|
|
newret = CONFREJ;
|
|
p[2] = DEFLATE_MAKE_OPT(ho->baddeflate_size);
|
|
break;
|
|
}
|
|
newret = CONFNAK;
|
|
--nb;
|
|
p[2] = DEFLATE_MAKE_OPT(nb);
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
case CI_BSD_COMPRESS:
|
|
if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
|
|
newret = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
ho->bsd_compress = 1;
|
|
ho->bsd_bits = nb = BSD_NBITS(p[2]);
|
|
if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
|
|
|| nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
|
|
newret = CONFNAK;
|
|
if (!dont_nak) {
|
|
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
|
|
/* fall through to test this #bits below */
|
|
} else
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check whether we can do BSD-Compress with the code
|
|
* size they want. If the code size is too big, reduce
|
|
* it until the kernel can cope and nak with that.
|
|
* We only check this for the first option.
|
|
*/
|
|
if (p == p0) {
|
|
for (;;) {
|
|
res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
|
|
if (res > 0)
|
|
break;
|
|
if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
|
|
newret = CONFREJ;
|
|
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
|
|
ho->bsd_bits);
|
|
break;
|
|
}
|
|
newret = CONFNAK;
|
|
--nb;
|
|
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CI_PREDICTOR_1:
|
|
if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
|
|
newret = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
ho->predictor_1 = 1;
|
|
if (p == p0
|
|
&& ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
|
|
newret = CONFREJ;
|
|
}
|
|
break;
|
|
|
|
case CI_PREDICTOR_2:
|
|
if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
|
|
newret = CONFREJ;
|
|
break;
|
|
}
|
|
|
|
ho->predictor_2 = 1;
|
|
if (p == p0
|
|
&& ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
|
|
newret = CONFREJ;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
newret = CONFREJ;
|
|
}
|
|
}
|
|
|
|
if (newret == CONFNAK && dont_nak)
|
|
newret = CONFREJ;
|
|
if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
|
|
/* we're returning this option */
|
|
if (newret == CONFREJ && ret == CONFNAK)
|
|
retp = p0;
|
|
ret = newret;
|
|
if (p != retp)
|
|
BCOPY(p, retp, clen);
|
|
retp += clen;
|
|
}
|
|
|
|
p += clen;
|
|
len -= clen;
|
|
}
|
|
|
|
if (ret != CONFACK) {
|
|
if (ret == CONFREJ && *lenp == retp - p0)
|
|
all_rejected[f->unit] = 1;
|
|
else
|
|
*lenp = retp - p0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Make a string name for a compression method (or 2).
|
|
*/
|
|
static char *
|
|
method_name(opt, opt2)
|
|
ccp_options *opt, *opt2;
|
|
{
|
|
static char result[64];
|
|
|
|
if (!ANY_COMPRESS(*opt))
|
|
return "(none)";
|
|
switch (opt->method) {
|
|
case CI_DEFLATE:
|
|
if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
|
|
sprintf(result, "Deflate (%d/%d)", opt->deflate_size,
|
|
opt2->deflate_size);
|
|
else
|
|
sprintf(result, "Deflate (%d)", opt->deflate_size);
|
|
break;
|
|
#ifdef CI_BADDEFLATE
|
|
case CI_BADDEFLATE:
|
|
if (opt2 != NULL && opt2->baddeflate_size != opt->baddeflate_size)
|
|
sprintf(result, "Bad-Deflate (%d/%d)", opt->baddeflate_size,
|
|
opt2->baddeflate_size);
|
|
else
|
|
sprintf(result, "Bad-Deflate (%d)", opt->baddeflate_size);
|
|
break;
|
|
#endif
|
|
case CI_BSD_COMPRESS:
|
|
if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
|
|
sprintf(result, "BSD-Compress (%d/%d)", opt->bsd_bits,
|
|
opt2->bsd_bits);
|
|
else
|
|
sprintf(result, "BSD-Compress (%d)", opt->bsd_bits);
|
|
break;
|
|
case CI_PREDICTOR_1:
|
|
return "Predictor 1";
|
|
case CI_PREDICTOR_2:
|
|
return "Predictor 2";
|
|
default:
|
|
sprintf(result, "Method %d", opt->method);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* CCP has come up - inform the kernel driver and log a message.
|
|
*/
|
|
static void
|
|
ccp_up(f)
|
|
fsm *f;
|
|
{
|
|
ccp_options *go = &ccp_gotoptions[f->unit];
|
|
ccp_options *ho = &ccp_hisoptions[f->unit];
|
|
char method1[64];
|
|
|
|
ccp_flags_set(f->unit, 1, 1);
|
|
if (ANY_COMPRESS(*go)) {
|
|
if (ANY_COMPRESS(*ho)) {
|
|
if (go->method == ho->method) {
|
|
syslog(LOG_NOTICE, "%s compression enabled",
|
|
method_name(go, ho));
|
|
} else {
|
|
strcpy(method1, method_name(go, NULL));
|
|
syslog(LOG_NOTICE, "%s / %s compression enabled",
|
|
method1, method_name(ho, NULL));
|
|
}
|
|
} else
|
|
syslog(LOG_NOTICE, "%s receive compression enabled",
|
|
method_name(go, NULL));
|
|
} else if (ANY_COMPRESS(*ho))
|
|
syslog(LOG_NOTICE, "%s transmit compression enabled",
|
|
method_name(ho, NULL));
|
|
}
|
|
|
|
/*
|
|
* CCP has gone down - inform the kernel driver.
|
|
*/
|
|
static void
|
|
ccp_down(f)
|
|
fsm *f;
|
|
{
|
|
if (ccp_localstate[f->unit] & RACK_PENDING)
|
|
UNTIMEOUT(ccp_rack_timeout, f);
|
|
ccp_localstate[f->unit] = 0;
|
|
ccp_flags_set(f->unit, 1, 0);
|
|
}
|
|
|
|
/*
|
|
* Print the contents of a CCP packet.
|
|
*/
|
|
static char *ccp_codenames[] = {
|
|
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
|
|
"TermReq", "TermAck", "CodeRej",
|
|
NULL, NULL, NULL, NULL, NULL, NULL,
|
|
"ResetReq", "ResetAck",
|
|
};
|
|
|
|
static int
|
|
ccp_printpkt(p, plen, printer, arg)
|
|
u_char *p;
|
|
int plen;
|
|
void (*printer) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
u_char *p0, *optend;
|
|
int code, id, len;
|
|
int optlen;
|
|
|
|
p0 = p;
|
|
if (plen < HEADERLEN)
|
|
return 0;
|
|
code = p[0];
|
|
id = p[1];
|
|
len = (p[2] << 8) + p[3];
|
|
if (len < HEADERLEN || len > plen)
|
|
return 0;
|
|
|
|
if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
|
|
&& ccp_codenames[code-1] != NULL)
|
|
printer(arg, " %s", ccp_codenames[code-1]);
|
|
else
|
|
printer(arg, " code=0x%x", code);
|
|
printer(arg, " id=0x%x", id);
|
|
len -= HEADERLEN;
|
|
p += HEADERLEN;
|
|
|
|
switch (code) {
|
|
case CONFREQ:
|
|
case CONFACK:
|
|
case CONFNAK:
|
|
case CONFREJ:
|
|
/* print list of possible compression methods */
|
|
while (len >= 2) {
|
|
code = p[0];
|
|
optlen = p[1];
|
|
if (optlen < 2 || optlen > len)
|
|
break;
|
|
printer(arg, " <");
|
|
len -= optlen;
|
|
optend = p + optlen;
|
|
switch (code) {
|
|
case CI_DEFLATE:
|
|
if (optlen >= CILEN_DEFLATE) {
|
|
printer(arg, "deflate %d", DEFLATE_SIZE(p[2]));
|
|
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
|
|
printer(arg, " method %d", DEFLATE_METHOD(p[2]));
|
|
if (p[3] != DEFLATE_CHK_SEQUENCE)
|
|
printer(arg, " check %d", p[3]);
|
|
p += CILEN_DEFLATE;
|
|
}
|
|
break;
|
|
#ifdef CI_BADDEFLATE
|
|
case CI_BADDEFLATE:
|
|
if (optlen >= CILEN_DEFLATE) {
|
|
printer(arg, "baddeflate %d", DEFLATE_SIZE(p[2]));
|
|
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
|
|
printer(arg, " method %d", DEFLATE_METHOD(p[2]));
|
|
if (p[3] != DEFLATE_CHK_SEQUENCE)
|
|
printer(arg, " check %d", p[3]);
|
|
p += CILEN_DEFLATE;
|
|
}
|
|
break;
|
|
#endif
|
|
case CI_BSD_COMPRESS:
|
|
if (optlen >= CILEN_BSD_COMPRESS) {
|
|
printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
|
|
BSD_NBITS(p[2]));
|
|
p += CILEN_BSD_COMPRESS;
|
|
}
|
|
break;
|
|
case CI_PREDICTOR_1:
|
|
if (optlen >= CILEN_PREDICTOR_1) {
|
|
printer(arg, "predictor 1");
|
|
p += CILEN_PREDICTOR_1;
|
|
}
|
|
break;
|
|
case CI_PREDICTOR_2:
|
|
if (optlen >= CILEN_PREDICTOR_2) {
|
|
printer(arg, "predictor 2");
|
|
p += CILEN_PREDICTOR_2;
|
|
}
|
|
break;
|
|
}
|
|
while (p < optend)
|
|
printer(arg, " %.2x", *p++);
|
|
printer(arg, ">");
|
|
}
|
|
break;
|
|
|
|
case TERMACK:
|
|
case TERMREQ:
|
|
if (len > 0 && *p >= ' ' && *p < 0x7f) {
|
|
print_string(p, len, printer, arg);
|
|
p += len;
|
|
len = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* dump out the rest of the packet in hex */
|
|
while (--len >= 0)
|
|
printer(arg, " %.2x", *p++);
|
|
|
|
return p - p0;
|
|
}
|
|
|
|
/*
|
|
* We have received a packet that the decompressor failed to
|
|
* decompress. Here we would expect to issue a reset-request, but
|
|
* Motorola has a patent on resetting the compressor as a result of
|
|
* detecting an error in the decompressed data after decompression.
|
|
* (See US patent 5,130,993; international patent publication number
|
|
* WO 91/10289; Australian patent 73296/91.)
|
|
*
|
|
* So we ask the kernel whether the error was detected after
|
|
* decompression; if it was, we take CCP down, thus disabling
|
|
* compression :-(, otherwise we issue the reset-request.
|
|
*/
|
|
static void
|
|
ccp_datainput(unit, pkt, len)
|
|
int unit;
|
|
u_char *pkt;
|
|
int len;
|
|
{
|
|
fsm *f;
|
|
|
|
f = &ccp_fsm[unit];
|
|
if (f->state == OPENED) {
|
|
if (ccp_fatal_error(unit)) {
|
|
/*
|
|
* Disable compression by taking CCP down.
|
|
*/
|
|
syslog(LOG_ERR, "Lost compression sync: disabling compression");
|
|
ccp_close(unit, "Lost compression sync");
|
|
} else {
|
|
/*
|
|
* Send a reset-request to reset the peer's compressor.
|
|
* We don't do that if we are still waiting for an
|
|
* acknowledgement to a previous reset-request.
|
|
*/
|
|
if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
|
|
fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
|
|
TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
|
|
ccp_localstate[f->unit] |= RACK_PENDING;
|
|
} else
|
|
ccp_localstate[f->unit] |= RREQ_REPEAT;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Timeout waiting for reset-ack.
|
|
*/
|
|
static void
|
|
ccp_rack_timeout(arg)
|
|
void *arg;
|
|
{
|
|
fsm *f = arg;
|
|
|
|
if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
|
|
fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
|
|
TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
|
|
ccp_localstate[f->unit] &= ~RREQ_REPEAT;
|
|
} else
|
|
ccp_localstate[f->unit] &= ~RACK_PENDING;
|
|
}
|
|
|