7f89db65f5
is called prior to sending a CCP configure request for a given protocol. The default is to send the request, but this is overridden for MPPE which checks to see if the lcp negotiations agreed CHAP81, and if not fails. Use the same function to decide if we should reject peer requests for MPPE. This should get rid of those boring messages about not being able to initialise MPPE when we don't negotiate CHAP81.
709 lines
20 KiB
C
709 lines
20 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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* $FreeBSD$
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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/param.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 <string.h> /* memcpy() on some archs */
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#include <termios.h>
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#include "layer.h"
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#include "defs.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 "timer.h"
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#include "fsm.h"
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#include "proto.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 "lqr.h"
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#include "hdlc.h"
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#include "lcp.h"
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#include "ccp.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 "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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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#ifdef HAVE_DES
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#include "mppe.h"
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#endif
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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 int CcpLayerUp(struct fsm *);
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static void CcpLayerDown(struct fsm *);
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static void CcpInitRestartCounter(struct fsm *, int);
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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 const char * const ccp_TimerNames[] =
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{"CCP restart", "CCP openmode", "CCP stopped"};
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static const char *
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protoname(int proto)
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{
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static char const * const cftypes[] = {
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/* Check out the latest ``Compression Control Protocol'' rfc (1962) */
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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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NULL, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL, NULL,
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"HWPPC", /* 16: Hewlett-Packard PPC */
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"STAC", /* 17: Stac Electronics LZS (rfc1974) */
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"MPPE", /* 18: Microsoft PPC (rfc2118) and */
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/* Microsoft PPE (draft-ietf-pppext-mppe) */
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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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NULL,
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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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if (proto < 0 || proto > sizeof cftypes / sizeof *cftypes ||
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cftypes[proto] == NULL)
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return HexStr(proto, NULL, 0);
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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 * const algorithm[] = {
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&DeflateAlgorithm,
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&Pred1Algorithm,
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&PppdDeflateAlgorithm
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#ifdef HAVE_DES
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, &MPPEAlgorithm
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#endif
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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;
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struct ccp *ccp;
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l = command_ChooseLink(arg);
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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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if (ccp->fsm.state == ST_OPENED) {
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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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}
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prompt_Printf(arg->prompt, "\n Defaults: ");
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prompt_Printf(arg->prompt, "FSM retry = %us, max %u Config"
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" REQ%s, %u Term REQ%s\n", ccp->cfg.fsm.timeout,
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ccp->cfg.fsm.maxreq, ccp->cfg.fsm.maxreq == 1 ? "" : "s",
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ccp->cfg.fsm.maxtrm, ccp->cfg.fsm.maxtrm == 1 ? "" : "s");
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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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#ifdef HAVE_DES
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prompt_Printf(arg->prompt, " MPPE: %s",
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command_ShowNegval(ccp->cfg.neg[CCP_NEG_MPPE]));
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prompt_Printf(arg->prompt, " (Key Size = %d-bits)\n", ccp->cfg.mppe.keybits);
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#endif
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return 0;
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}
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void
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ccp_SetupCallbacks(struct ccp *ccp)
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{
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ccp->fsm.fn = &ccp_Callbacks;
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ccp->fsm.FsmTimer.name = ccp_TimerNames[0];
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ccp->fsm.OpenTimer.name = ccp_TimerNames[1];
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ccp->fsm.StoppedTimer.name = ccp_TimerNames[2];
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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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fsm_Init(&ccp->fsm, "CCP", PROTO_CCP, 1, CCP_MAXCODE, LogCCP,
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bundle, l, parent, &ccp_Callbacks, ccp_TimerNames);
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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.fsm.timeout = DEF_FSMRETRY;
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ccp->cfg.fsm.maxreq = DEF_FSMTRIES;
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ccp->cfg.fsm.maxtrm = DEF_FSMTRIES;
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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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#ifdef HAVE_DES
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ccp->cfg.mppe.keybits = 128;
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ccp->cfg.neg[CCP_NEG_MPPE] = NEG_ENABLED|NEG_ACCEPTED;
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#endif
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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->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, int what)
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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.fsm.timeout * SECTICKS;
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switch (what) {
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case FSM_REQ_TIMER:
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fp->restart = ccp->cfg.fsm.maxreq;
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break;
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case FSM_TRM_TIMER:
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fp->restart = ccp->cfg.fsm.maxtrm;
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break;
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default:
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fp->restart = 1;
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break;
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}
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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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(*algorithm[f]->Usable)(fp)) {
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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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log_Printf(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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fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, cp - buff, MB_CCPOUT);
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}
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void
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ccp_SendResetReq(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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fsm_Output(fp, CODE_RESETREQ, fp->reqid, NULL, 0, MB_CCPOUT);
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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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fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_CCPOUT);
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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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struct ccp *ccp = fsm2ccp(fp);
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log_Printf(LogCCP, "%s: LayerStart.\n", fp->link->name);
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fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3;
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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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struct ccp *ccp = fsm2ccp(fp);
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struct ccp_opt *next;
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log_Printf(LogCCP, "%s: LayerDown.\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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ccp_Setup(ccp);
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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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log_Printf(LogCCP, "%s: LayerFinish.\n", fp->link->name);
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/*
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* Nuke options that may be left over from sending a REQ but never
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* coming up.
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*/
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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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/* Called when CCP has reached the OPEN state */
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static int
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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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struct ccp_opt **o;
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int f;
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log_Printf(LogCCP, "%s: LayerUp.\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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log_Printf(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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fsm_Close(fp);
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return 0;
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}
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}
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o = &ccp->out.opt;
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for (f = 0; f < ccp->out.algorithm; f++)
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if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]))
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o = &(*o)->next;
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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)(&(*o)->val);
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if (ccp->out.state == NULL) {
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log_Printf(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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fsm_Close(fp);
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return 0;
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}
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}
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fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3;
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log_Printf(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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return 1;
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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, f;
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const char *end;
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if (mode_type == MODE_REQ)
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ccp->in.algorithm = -1; /* In case we've received two REQs in a row */
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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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log_Printf(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)) {
|
|
length = sizeof(struct lcp_opt);
|
|
log_Printf(LogCCP, "%s: Warning: Truncating length to %d\n",
|
|
fp->link->name, length);
|
|
}
|
|
|
|
for (f = NALGORITHMS-1; f > -1; f--)
|
|
if (algorithm[f]->id == type)
|
|
break;
|
|
|
|
end = f == -1 ? "" : (*algorithm[f]->Disp)((struct lcp_opt *)cp);
|
|
if (end == NULL)
|
|
end = "";
|
|
|
|
log_Printf(LogCCP, " %s[%d] %s\n", protoname(type), length, end);
|
|
|
|
if (f == -1) {
|
|
/* Don't understand that :-( */
|
|
if (mode_type == MODE_REQ) {
|
|
ccp->my_reject |= (1 << type);
|
|
memcpy(dec->rejend, cp, length);
|
|
dec->rejend += length;
|
|
}
|
|
} else {
|
|
struct ccp_opt *o;
|
|
|
|
switch (mode_type) {
|
|
case MODE_REQ:
|
|
if (IsAccepted(ccp->cfg.neg[algorithm[f]->Neg]) &&
|
|
(*algorithm[f]->Usable)(fp) &&
|
|
ccp->in.algorithm == -1) {
|
|
memcpy(&ccp->in.opt, cp, length);
|
|
switch ((*algorithm[f]->i.Set)(&ccp->in.opt, &ccp->cfg)) {
|
|
case MODE_REJ:
|
|
memcpy(dec->rejend, &ccp->in.opt, ccp->in.opt.len);
|
|
dec->rejend += ccp->in.opt.len;
|
|
break;
|
|
case MODE_NAK:
|
|
memcpy(dec->nakend, &ccp->in.opt, ccp->in.opt.len);
|
|
dec->nakend += ccp->in.opt.len;
|
|
break;
|
|
case MODE_ACK:
|
|
memcpy(dec->ackend, cp, length);
|
|
dec->ackend += length;
|
|
ccp->his_proto = type;
|
|
ccp->in.algorithm = f; /* This one'll do :-) */
|
|
break;
|
|
}
|
|
} else {
|
|
memcpy(dec->rejend, cp, length);
|
|
dec->rejend += length;
|
|
}
|
|
break;
|
|
case MODE_NAK:
|
|
for (o = ccp->out.opt; o != NULL; o = o->next)
|
|
if (o->val.id == cp[0])
|
|
break;
|
|
if (o == NULL)
|
|
log_Printf(LogCCP, "%s: Warning: Ignoring peer NAK of unsent"
|
|
" option\n", fp->link->name);
|
|
else {
|
|
memcpy(&o->val, cp, length);
|
|
if ((*algorithm[f]->o.Set)(&o->val) == MODE_ACK)
|
|
ccp->my_proto = algorithm[f]->id;
|
|
else {
|
|
ccp->his_reject |= (1 << type);
|
|
ccp->my_proto = -1;
|
|
}
|
|
}
|
|
break;
|
|
case MODE_REJ:
|
|
ccp->his_reject |= (1 << type);
|
|
ccp->my_proto = -1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
plen -= cp[1];
|
|
cp += cp[1];
|
|
}
|
|
|
|
if (mode_type != MODE_NOP) {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
extern struct mbuf *
|
|
ccp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
|
|
{
|
|
/* Got PROTO_CCP from link */
|
|
m_settype(bp, MB_CCPIN);
|
|
if (bundle_Phase(bundle) == PHASE_NETWORK)
|
|
fsm_Input(&l->ccp.fsm, bp);
|
|
else {
|
|
if (bundle_Phase(bundle) < PHASE_NETWORK)
|
|
log_Printf(LogCCP, "%s: Error: Unexpected CCP in phase %s (ignored)\n",
|
|
l->ccp.fsm.link->name, bundle_PhaseName(bundle));
|
|
m_freem(bp);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
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) {
|
|
log_Printf(LogCCP, "%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)
|
|
log_Printf(LogCCP, "%s: Duplicate ResetAck (resetting again)\n",
|
|
fp->link->name);
|
|
else {
|
|
log_Printf(LogCCP, "%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);
|
|
}
|
|
|
|
static struct mbuf *
|
|
ccp_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp,
|
|
int pri, u_short *proto)
|
|
{
|
|
if (PROTO_COMPRESSIBLE(*proto) && l->ccp.fsm.state == ST_OPENED &&
|
|
l->ccp.out.state != NULL) {
|
|
bp = (*algorithm[l->ccp.out.algorithm]->o.Write)
|
|
(l->ccp.out.state, &l->ccp, l, pri, proto, bp);
|
|
switch (*proto) {
|
|
case PROTO_ICOMPD:
|
|
m_settype(bp, MB_ICOMPDOUT);
|
|
break;
|
|
case PROTO_COMPD:
|
|
m_settype(bp, MB_COMPDOUT);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return bp;
|
|
}
|
|
|
|
static struct mbuf *
|
|
ccp_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, u_short *proto)
|
|
{
|
|
/*
|
|
* If proto isn't PROTO_[I]COMPD, we still want to pass it to the
|
|
* decompression routines so that the dictionary's updated
|
|
*/
|
|
if (l->ccp.fsm.state == ST_OPENED) {
|
|
if (*proto == PROTO_COMPD || *proto == PROTO_ICOMPD) {
|
|
log_Printf(LogDEBUG, "ccp_LayerPull: PROTO_%sCOMPDP -> PROTO_IP\n",
|
|
*proto == PROTO_ICOMPD ? "I" : "");
|
|
/* Decompress incoming data */
|
|
if (l->ccp.reset_sent != -1)
|
|
/* Send another REQ and put the packet in the bit bucket */
|
|
fsm_Output(&l->ccp.fsm, CODE_RESETREQ, l->ccp.reset_sent, NULL, 0,
|
|
MB_CCPOUT);
|
|
else if (l->ccp.in.state != NULL) {
|
|
bp = (*algorithm[l->ccp.in.algorithm]->i.Read)
|
|
(l->ccp.in.state, &l->ccp, proto, bp);
|
|
switch (*proto) {
|
|
case PROTO_ICOMPD:
|
|
m_settype(bp, MB_ICOMPDIN);
|
|
break;
|
|
case PROTO_COMPD:
|
|
m_settype(bp, MB_COMPDIN);
|
|
break;
|
|
}
|
|
return bp;
|
|
}
|
|
m_freem(bp);
|
|
bp = NULL;
|
|
} else if (PROTO_COMPRESSIBLE(*proto) && l->ccp.in.state != NULL) {
|
|
log_Printf(LogDEBUG, "ccp_LayerPull: Ignore packet (dict only)\n");
|
|
/* Add incoming Network Layer traffic to our dictionary */
|
|
(*algorithm[l->ccp.in.algorithm]->i.DictSetup)
|
|
(l->ccp.in.state, &l->ccp, *proto, bp);
|
|
} else
|
|
log_Printf(LogDEBUG, "ccp_LayerPull: Ignore packet\n");
|
|
}
|
|
|
|
return bp;
|
|
}
|
|
|
|
u_short
|
|
ccp_Proto(struct ccp *ccp)
|
|
{
|
|
return !link2physical(ccp->fsm.link) || !ccp->fsm.bundle->ncp.mp.active ?
|
|
PROTO_COMPD : PROTO_ICOMPD;
|
|
}
|
|
|
|
int
|
|
ccp_SetOpenMode(struct ccp *ccp)
|
|
{
|
|
int f;
|
|
|
|
for (f = 0; f < CCP_NEG_TOTAL; f++)
|
|
if (IsEnabled(ccp->cfg.neg[f])) {
|
|
ccp->fsm.open_mode = 0;
|
|
return 1;
|
|
}
|
|
|
|
ccp->fsm.open_mode = OPEN_PASSIVE; /* Go straight to ST_STOPPED ? */
|
|
|
|
for (f = 0; f < CCP_NEG_TOTAL; f++)
|
|
if (IsAccepted(ccp->cfg.neg[f]))
|
|
return 1;
|
|
|
|
return 0; /* No CCP at all */
|
|
}
|
|
|
|
int
|
|
ccp_IsUsable(struct fsm *fp)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
struct layer ccplayer = { LAYER_CCP, "ccp", ccp_LayerPush, ccp_LayerPull };
|