1fa665f5b3
o Create struct mpserver as part of struct mp. mpserver creates a unix-domain socket based on the peers auth name and endpoint discriminator. If it already exists, ppp will ``pass the link'' over to the owner of the socket, joining it into the bundle of another ppp invocation, otherwise ppp waits for other invocations to pass it links through this socket. The final piece of code will be the code that flattens our datalink info and passes it down this channel (not yet implemented).
573 lines
16 KiB
C
573 lines
16 KiB
C
/*
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* PPP Compression Control Protocol (CCP) Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
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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 the Internet Initiative Japan, Inc. The name of the
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* IIJ 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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* $Id: ccp.c,v 1.30.2.39 1998/04/25 10:48:49 brian Exp $
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*
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* TODO:
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* o Support other compression protocols
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/un.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "defs.h"
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#include "timer.h"
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#include "fsm.h"
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#include "lcpproto.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "pred.h"
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#include "deflate.h"
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#include "throughput.h"
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#include "iplist.h"
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#include "slcompress.h"
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#include "ipcp.h"
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#include "filter.h"
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#include "descriptor.h"
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#include "prompt.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "link.h"
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#include "mp.h"
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#include "async.h"
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#include "physical.h"
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#include "bundle.h"
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static void CcpSendConfigReq(struct fsm *);
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static void CcpSentTerminateReq(struct fsm *);
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static void CcpSendTerminateAck(struct fsm *, u_char);
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static void CcpDecodeConfig(struct fsm *, u_char *, int, int,
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struct fsm_decode *);
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static void CcpLayerStart(struct fsm *);
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static void CcpLayerFinish(struct fsm *);
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static void CcpLayerUp(struct fsm *);
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static void CcpLayerDown(struct fsm *);
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static void CcpInitRestartCounter(struct fsm *);
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static void CcpRecvResetReq(struct fsm *);
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static void CcpRecvResetAck(struct fsm *, u_char);
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static struct fsm_callbacks ccp_Callbacks = {
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CcpLayerUp,
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CcpLayerDown,
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CcpLayerStart,
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CcpLayerFinish,
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CcpInitRestartCounter,
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CcpSendConfigReq,
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CcpSentTerminateReq,
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CcpSendTerminateAck,
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CcpDecodeConfig,
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CcpRecvResetReq,
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CcpRecvResetAck
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};
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static char const *cftypes[] = {
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/* Check out the latest ``Compression Control Protocol'' rfc (rfc1962.txt) */
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"OUI", /* 0: OUI */
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"PRED1", /* 1: Predictor type 1 */
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"PRED2", /* 2: Predictor type 2 */
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"PUDDLE", /* 3: Puddle Jumber */
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"???", "???", "???", "???", "???", "???",
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"???", "???", "???", "???", "???", "???",
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"HWPPC", /* 16: Hewlett-Packard PPC */
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"STAC", /* 17: Stac Electronics LZS (rfc1974) */
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"MPPC", /* 18: Microsoft PPC (rfc2118) */
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"GAND", /* 19: Gandalf FZA (rfc1993) */
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"V42BIS", /* 20: ARG->DATA.42bis compression */
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"BSD", /* 21: BSD LZW Compress */
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"???",
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"LZS-DCP", /* 23: LZS-DCP Compression Protocol (rfc1967) */
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"MAGNALINK/DEFLATE", /* 24: Magnalink Variable Resource (rfc1975) */
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/* 24: Deflate (according to pppd-2.3.*) */
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"DCE", /* 25: Data Circuit-Terminating Equip (rfc1976) */
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"DEFLATE", /* 26: Deflate (rfc1979) */
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};
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#define NCFTYPES (sizeof cftypes/sizeof cftypes[0])
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static const char *
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protoname(int proto)
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{
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if (proto < 0 || proto > NCFTYPES)
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return "none";
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return cftypes[proto];
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}
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/* We support these algorithms, and Req them in the given order */
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static const struct ccp_algorithm *algorithm[] = {
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&DeflateAlgorithm,
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&Pred1Algorithm,
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&PppdDeflateAlgorithm
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};
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#define NALGORITHMS (sizeof algorithm/sizeof algorithm[0])
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int
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ccp_ReportStatus(struct cmdargs const *arg)
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{
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struct link *l = ChooseLink(arg);
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struct ccp *ccp = &l->ccp;
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prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, ccp->fsm.name,
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State2Nam(ccp->fsm.state));
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prompt_Printf(arg->prompt, " My protocol = %s, His protocol = %s\n",
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protoname(ccp->my_proto), protoname(ccp->his_proto));
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prompt_Printf(arg->prompt, " Output: %ld --> %ld, Input: %ld --> %ld\n",
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ccp->uncompout, ccp->compout,
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ccp->compin, ccp->uncompin);
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prompt_Printf(arg->prompt, "\n Defaults: ");
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prompt_Printf(arg->prompt, "FSM retry = %us\n", ccp->cfg.fsmretry);
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prompt_Printf(arg->prompt, " deflate windows: ");
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prompt_Printf(arg->prompt, "incoming = %d, ", ccp->cfg.deflate.in.winsize);
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prompt_Printf(arg->prompt, "outgoing = %d\n", ccp->cfg.deflate.out.winsize);
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prompt_Printf(arg->prompt, " DEFLATE: %s\n",
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command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE]));
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prompt_Printf(arg->prompt, " PREDICTOR1: %s\n",
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command_ShowNegval(ccp->cfg.neg[CCP_NEG_PRED1]));
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prompt_Printf(arg->prompt, " DEFLATE24: %s\n",
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command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE24]));
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return 0;
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}
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void
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ccp_Init(struct ccp *ccp, struct bundle *bundle, struct link *l,
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const struct fsm_parent *parent)
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{
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/* Initialise ourselves */
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static const char *timer_names[] =
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{"CCP restart", "CCP openmode", "CCP stopped"};
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fsm_Init(&ccp->fsm, "CCP", PROTO_CCP, 1, CCP_MAXCODE, 10, LogCCP,
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bundle, l, parent, &ccp_Callbacks, timer_names);
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ccp->cfg.deflate.in.winsize = 0;
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ccp->cfg.deflate.out.winsize = 15;
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ccp->cfg.fsmretry = DEF_FSMRETRY;
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ccp->cfg.neg[CCP_NEG_DEFLATE] = NEG_ENABLED|NEG_ACCEPTED;
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ccp->cfg.neg[CCP_NEG_PRED1] = NEG_ENABLED|NEG_ACCEPTED;
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ccp->cfg.neg[CCP_NEG_DEFLATE24] = 0;
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ccp_Setup(ccp);
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}
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void
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ccp_Setup(struct ccp *ccp)
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{
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/* Set ourselves up for a startup */
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ccp->fsm.open_mode = 0;
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ccp->fsm.maxconfig = 10;
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ccp->his_proto = ccp->my_proto = -1;
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ccp->reset_sent = ccp->last_reset = -1;
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ccp->in.algorithm = ccp->out.algorithm = -1;
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ccp->in.state = ccp->out.state = NULL;
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ccp->in.opt.id = -1;
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ccp->out.opt = NULL;
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ccp->his_reject = ccp->my_reject = 0;
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ccp->uncompout = ccp->compout = 0;
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ccp->uncompin = ccp->compin = 0;
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}
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static void
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CcpInitRestartCounter(struct fsm *fp)
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{
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/* Set fsm timer load */
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struct ccp *ccp = fsm2ccp(fp);
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fp->FsmTimer.load = ccp->cfg.fsmretry * SECTICKS;
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fp->restart = 5;
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}
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static void
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CcpSendConfigReq(struct fsm *fp)
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{
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/* Send config REQ please */
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struct ccp *ccp = fsm2ccp(fp);
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struct ccp_opt **o;
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u_char *cp, buff[100];
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int f, alloc;
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cp = buff;
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o = &ccp->out.opt;
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alloc = ccp->his_reject == 0 && ccp->out.opt == NULL;
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ccp->my_proto = -1;
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ccp->out.algorithm = -1;
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for (f = 0; f < NALGORITHMS; f++)
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if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) &&
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!REJECTED(ccp, algorithm[f]->id)) {
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if (!alloc)
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for (o = &ccp->out.opt; *o != NULL; o = &(*o)->next)
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if ((*o)->val.id == algorithm[f]->id && (*o)->algorithm == f)
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break;
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if (alloc || *o == NULL) {
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*o = (struct ccp_opt *)malloc(sizeof(struct ccp_opt));
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(*o)->val.id = algorithm[f]->id;
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(*o)->val.len = 2;
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(*o)->next = NULL;
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(*o)->algorithm = f;
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(*algorithm[f]->o.OptInit)(&(*o)->val, &ccp->cfg);
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}
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if (cp + (*o)->val.len > buff + sizeof buff) {
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LogPrintf(LogERROR, "%s: CCP REQ buffer overrun !\n", fp->link->name);
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break;
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}
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memcpy(cp, &(*o)->val, (*o)->val.len);
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cp += (*o)->val.len;
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ccp->my_proto = (*o)->val.id;
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ccp->out.algorithm = f;
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if (alloc)
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o = &(*o)->next;
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}
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FsmOutput(fp, CODE_CONFIGREQ, fp->reqid, buff, cp - buff);
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}
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void
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CcpSendResetReq(struct fsm *fp)
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{
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/* We can't read our input - ask peer to reset */
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struct ccp *ccp = fsm2ccp(fp);
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ccp->reset_sent = fp->reqid;
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ccp->last_reset = -1;
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FsmOutput(fp, CODE_RESETREQ, fp->reqid, NULL, 0);
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}
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static void
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CcpSentTerminateReq(struct fsm *fp)
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{
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/* Term REQ just sent by FSM */
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}
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static void
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CcpSendTerminateAck(struct fsm *fp, u_char id)
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{
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/* Send Term ACK please */
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FsmOutput(fp, CODE_TERMACK, id, NULL, 0);
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}
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static void
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CcpRecvResetReq(struct fsm *fp)
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{
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/* Got a reset REQ, reset outgoing dictionary */
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struct ccp *ccp = fsm2ccp(fp);
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if (ccp->out.state != NULL)
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(*algorithm[ccp->out.algorithm]->o.Reset)(ccp->out.state);
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}
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static void
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CcpLayerStart(struct fsm *fp)
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{
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/* We're about to start up ! */
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LogPrintf(LogCCP, "%s: CcpLayerStart.\n", fp->link->name);
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}
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static void
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CcpLayerFinish(struct fsm *fp)
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{
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/* We're now down */
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struct ccp *ccp = fsm2ccp(fp);
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struct ccp_opt *next;
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LogPrintf(LogCCP, "%s: CcpLayerFinish.\n", fp->link->name);
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if (ccp->in.state != NULL) {
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(*algorithm[ccp->in.algorithm]->i.Term)(ccp->in.state);
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ccp->in.state = NULL;
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ccp->in.algorithm = -1;
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}
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if (ccp->out.state != NULL) {
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(*algorithm[ccp->out.algorithm]->o.Term)(ccp->out.state);
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ccp->out.state = NULL;
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ccp->out.algorithm = -1;
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}
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ccp->his_reject = ccp->my_reject = 0;
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while (ccp->out.opt) {
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next = ccp->out.opt->next;
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free(ccp->out.opt);
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ccp->out.opt = next;
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}
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}
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static void
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CcpLayerDown(struct fsm *fp)
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{
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/* About to come down */
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LogPrintf(LogCCP, "%s: CcpLayerDown.\n", fp->link->name);
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}
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/*
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* Called when CCP has reached the OPEN state
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*/
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static void
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CcpLayerUp(struct fsm *fp)
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{
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/* We're now up */
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struct ccp *ccp = fsm2ccp(fp);
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LogPrintf(LogCCP, "%s: CcpLayerUp.\n", fp->link->name);
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if (ccp->in.state == NULL && ccp->in.algorithm >= 0 &&
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ccp->in.algorithm < NALGORITHMS) {
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ccp->in.state = (*algorithm[ccp->in.algorithm]->i.Init)(&ccp->in.opt);
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if (ccp->in.state == NULL) {
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LogPrintf(LogERROR, "%s: %s (in) initialisation failure\n",
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fp->link->name, protoname(ccp->his_proto));
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ccp->his_proto = ccp->my_proto = -1;
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FsmClose(fp);
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}
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}
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if (ccp->out.state == NULL && ccp->out.algorithm >= 0 &&
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ccp->out.algorithm < NALGORITHMS) {
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ccp->out.state = (*algorithm[ccp->out.algorithm]->o.Init)
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(&ccp->out.opt->val);
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if (ccp->out.state == NULL) {
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LogPrintf(LogERROR, "%s: %s (out) initialisation failure\n",
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fp->link->name, protoname(ccp->my_proto));
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ccp->his_proto = ccp->my_proto = -1;
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FsmClose(fp);
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}
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}
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LogPrintf(LogCCP, "%s: Out = %s[%d], In = %s[%d]\n",
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fp->link->name, protoname(ccp->my_proto), ccp->my_proto,
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protoname(ccp->his_proto), ccp->his_proto);
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}
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static void
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CcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type,
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struct fsm_decode *dec)
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{
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/* Deal with incoming data */
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struct ccp *ccp = fsm2ccp(fp);
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int type, length;
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int f;
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const char *end;
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while (plen >= sizeof(struct fsmconfig)) {
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type = *cp;
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length = cp[1];
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if (length == 0) {
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LogPrintf(LogCCP, "%s: CCP size zero\n", fp->link->name);
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break;
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}
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if (length > sizeof(struct lcp_opt)) {
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length = sizeof(struct lcp_opt);
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LogPrintf(LogCCP, "%s: Warning: Truncating length to %d\n",
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fp->link->name, length);
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}
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for (f = NALGORITHMS-1; f > -1; f--)
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if (algorithm[f]->id == type)
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break;
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end = f == -1 ? "" : (*algorithm[f]->Disp)((struct lcp_opt *)cp);
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if (end == NULL)
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end = "";
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if (type < NCFTYPES)
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LogPrintf(LogCCP, " %s[%d] %s\n", cftypes[type], length, end);
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else
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LogPrintf(LogCCP, " ???[%d] %s\n", length, end);
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if (f == -1) {
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/* Don't understand that :-( */
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if (mode_type == MODE_REQ) {
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ccp->my_reject |= (1 << type);
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memcpy(dec->rejend, cp, length);
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dec->rejend += length;
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}
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} else {
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struct ccp_opt *o;
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switch (mode_type) {
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case MODE_REQ:
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if (IsAccepted(ccp->cfg.neg[algorithm[f]->Neg]) &&
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ccp->in.algorithm == -1) {
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memcpy(&ccp->in.opt, cp, length);
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switch ((*algorithm[f]->i.Set)(&ccp->in.opt, &ccp->cfg)) {
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case MODE_REJ:
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memcpy(dec->rejend, &ccp->in.opt, ccp->in.opt.len);
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dec->rejend += ccp->in.opt.len;
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break;
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case MODE_NAK:
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memcpy(dec->nakend, &ccp->in.opt, ccp->in.opt.len);
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dec->nakend += ccp->in.opt.len;
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break;
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case MODE_ACK:
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memcpy(dec->ackend, cp, length);
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dec->ackend += length;
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ccp->his_proto = type;
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ccp->in.algorithm = f; /* This one'll do :-) */
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break;
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}
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} else {
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memcpy(dec->rejend, cp, length);
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dec->rejend += length;
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}
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break;
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case MODE_NAK:
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for (o = ccp->out.opt; o != NULL; o = o->next)
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if (o->val.id == cp[0])
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break;
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if (o == NULL)
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LogPrintf(LogCCP, "%s: Warning: Ignoring peer NAK of unsent option\n",
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fp->link->name);
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else {
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memcpy(&o->val, cp, length);
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if ((*algorithm[f]->o.Set)(&o->val) == MODE_ACK)
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ccp->my_proto = algorithm[f]->id;
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else {
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ccp->his_reject |= (1 << type);
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ccp->my_proto = -1;
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}
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}
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break;
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case MODE_REJ:
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ccp->his_reject |= (1 << type);
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ccp->my_proto = -1;
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break;
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}
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}
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plen -= cp[1];
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cp += cp[1];
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}
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if (mode_type != MODE_NOP) {
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if (dec->rejend != dec->rej) {
|
|
/* rejects are preferred */
|
|
dec->ackend = dec->ack;
|
|
dec->nakend = dec->nak;
|
|
if (ccp->in.state == NULL) {
|
|
ccp->his_proto = -1;
|
|
ccp->in.algorithm = -1;
|
|
}
|
|
} else if (dec->nakend != dec->nak) {
|
|
/* then NAKs */
|
|
dec->ackend = dec->ack;
|
|
if (ccp->in.state == NULL) {
|
|
ccp->his_proto = -1;
|
|
ccp->in.algorithm = -1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
CcpInput(struct ccp *ccp, struct bundle *bundle, struct mbuf *bp)
|
|
{
|
|
/* Got PROTO_CCP from link */
|
|
if (bundle_Phase(bundle) == PHASE_NETWORK)
|
|
FsmInput(&ccp->fsm, bp);
|
|
else if (bundle_Phase(bundle) < PHASE_NETWORK) {
|
|
LogPrintf(LogCCP, "%s: Error: Unexpected CCP in phase %s (ignored)\n",
|
|
ccp->fsm.link->name, bundle_PhaseName(bundle));
|
|
pfree(bp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
CcpRecvResetAck(struct fsm *fp, u_char id)
|
|
{
|
|
/* Got a reset ACK, reset incoming dictionary */
|
|
struct ccp *ccp = fsm2ccp(fp);
|
|
|
|
if (ccp->reset_sent != -1) {
|
|
if (id != ccp->reset_sent) {
|
|
LogPrintf(LogWARN, "CCP: %s: Incorrect ResetAck (id %d, not %d)"
|
|
" ignored\n", fp->link->name, id, ccp->reset_sent);
|
|
return;
|
|
}
|
|
/* Whaddaya know - a correct reset ack */
|
|
} else if (id == ccp->last_reset)
|
|
LogPrintf(LogCCP, "%s: Duplicate ResetAck (resetting again)\n",
|
|
fp->link->name);
|
|
else {
|
|
LogPrintf(LogWARN, "CCP: %s: Unexpected ResetAck (id %d) ignored\n",
|
|
fp->link->name, id);
|
|
return;
|
|
}
|
|
|
|
ccp->last_reset = ccp->reset_sent;
|
|
ccp->reset_sent = -1;
|
|
if (ccp->in.state != NULL)
|
|
(*algorithm[ccp->in.algorithm]->i.Reset)(ccp->in.state);
|
|
}
|
|
|
|
int
|
|
ccp_Compress(struct ccp *ccp, struct link *l, int pri, u_short proto,
|
|
struct mbuf *m)
|
|
{
|
|
/* Compress outgoing Network Layer data */
|
|
if ((proto & 0xfff1) == 0x21 && ccp->fsm.state == ST_OPENED &&
|
|
ccp->out.state != NULL)
|
|
return (*algorithm[ccp->out.algorithm]->o.Write)
|
|
(ccp->out.state, ccp, l, pri, proto, m);
|
|
return 0;
|
|
}
|
|
|
|
struct mbuf *
|
|
ccp_Decompress(struct ccp *ccp, u_short *proto, struct mbuf *bp)
|
|
{
|
|
/*
|
|
* If proto isn't PROTO_[I]COMPD, we still want to pass it to the
|
|
* decompression routines so that the dictionary's updated
|
|
*/
|
|
if (ccp->fsm.state == ST_OPENED) {
|
|
if (*proto == PROTO_COMPD || *proto == PROTO_ICOMPD) {
|
|
/* Decompress incoming data */
|
|
if (ccp->reset_sent != -1)
|
|
/* Send another REQ and put the packet in the bit bucket */
|
|
FsmOutput(&ccp->fsm, CODE_RESETREQ, ccp->reset_sent, NULL, 0);
|
|
else if (ccp->in.state != NULL)
|
|
return (*algorithm[ccp->in.algorithm]->i.Read)
|
|
(ccp->in.state, ccp, proto, bp);
|
|
pfree(bp);
|
|
bp = NULL;
|
|
} else if ((*proto & 0xfff1) == 0x21 && ccp->in.state != NULL)
|
|
/* Add incoming Network Layer traffic to our dictionary */
|
|
(*algorithm[ccp->in.algorithm]->i.DictSetup)
|
|
(ccp->in.state, ccp, *proto, bp);
|
|
}
|
|
|
|
return bp;
|
|
}
|
|
|
|
u_short
|
|
ccp_Proto(struct ccp *ccp)
|
|
{
|
|
return !link2physical(ccp->fsm.link) || !ccp->fsm.bundle->ncp.mp.active ?
|
|
PROTO_COMPD : PROTO_ICOMPD;
|
|
}
|