FreeBSD-5.3/usr.sbin/ppp/ccp.c
/*-
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/usr.sbin/ppp/ccp.c,v 1.76 2002/08/27 20:11:57 brian Exp $
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* memcpy() on some archs */
#include <termios.h>
#include "layer.h"
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "proto.h"
#include "pred.h"
#include "deflate.h"
#include "throughput.h"
#include "iplist.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "ccp.h"
#include "ncpaddr.h"
#include "ipcp.h"
#include "filter.h"
#include "descriptor.h"
#include "prompt.h"
#include "link.h"
#include "mp.h"
#include "async.h"
#include "physical.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#ifndef NODES
#include "mppe.h"
#endif
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
static void CcpSendConfigReq(struct fsm *);
static void CcpSentTerminateReq(struct fsm *);
static void CcpSendTerminateAck(struct fsm *, u_char);
static void CcpDecodeConfig(struct fsm *, u_char *, u_char *, int,
struct fsm_decode *);
static void CcpLayerStart(struct fsm *);
static void CcpLayerFinish(struct fsm *);
static int CcpLayerUp(struct fsm *);
static void CcpLayerDown(struct fsm *);
static void CcpInitRestartCounter(struct fsm *, int);
static int CcpRecvResetReq(struct fsm *);
static void CcpRecvResetAck(struct fsm *, u_char);
static struct fsm_callbacks ccp_Callbacks = {
CcpLayerUp,
CcpLayerDown,
CcpLayerStart,
CcpLayerFinish,
CcpInitRestartCounter,
CcpSendConfigReq,
CcpSentTerminateReq,
CcpSendTerminateAck,
CcpDecodeConfig,
CcpRecvResetReq,
CcpRecvResetAck
};
static const char * const ccp_TimerNames[] =
{"CCP restart", "CCP openmode", "CCP stopped"};
static const char *
protoname(int proto)
{
static char const * const cftypes[] = {
/* Check out the latest ``Compression Control Protocol'' rfc (1962) */
"OUI", /* 0: OUI */
"PRED1", /* 1: Predictor type 1 */
"PRED2", /* 2: Predictor type 2 */
"PUDDLE", /* 3: Puddle Jumber */
NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL,
"HWPPC", /* 16: Hewlett-Packard PPC */
"STAC", /* 17: Stac Electronics LZS (rfc1974) */
"MPPE", /* 18: Microsoft PPC (rfc2118) and */
/* Microsoft PPE (draft-ietf-pppext-mppe) */
"GAND", /* 19: Gandalf FZA (rfc1993) */
"V42BIS", /* 20: ARG->DATA.42bis compression */
"BSD", /* 21: BSD LZW Compress */
NULL,
"LZS-DCP", /* 23: LZS-DCP Compression Protocol (rfc1967) */
"MAGNALINK/DEFLATE",/* 24: Magnalink Variable Resource (rfc1975) */
/* 24: Deflate (according to pppd-2.3.*) */
"DCE", /* 25: Data Circuit-Terminating Equip (rfc1976) */
"DEFLATE", /* 26: Deflate (rfc1979) */
};
if (proto < 0 || proto > sizeof cftypes / sizeof *cftypes ||
cftypes[proto] == NULL) {
if (proto == -1)
return "none";
return HexStr(proto, NULL, 0);
}
return cftypes[proto];
}
/* We support these algorithms, and Req them in the given order */
static const struct ccp_algorithm * const algorithm[] = {
&DeflateAlgorithm,
&Pred1Algorithm,
&PppdDeflateAlgorithm
#ifndef NODES
, &MPPEAlgorithm
#endif
};
#define NALGORITHMS (sizeof algorithm/sizeof algorithm[0])
int
ccp_ReportStatus(struct cmdargs const *arg)
{
struct ccp_opt **o;
struct link *l;
struct ccp *ccp;
int f;
l = command_ChooseLink(arg);
ccp = &l->ccp;
prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, ccp->fsm.name,
State2Nam(ccp->fsm.state));
if (ccp->fsm.state == ST_OPENED) {
prompt_Printf(arg->prompt, " My protocol = %s, His protocol = %s\n",
protoname(ccp->my_proto), protoname(ccp->his_proto));
prompt_Printf(arg->prompt, " Output: %ld --> %ld, Input: %ld --> %ld\n",
ccp->uncompout, ccp->compout,
ccp->compin, ccp->uncompin);
}
if (ccp->in.algorithm != -1)
prompt_Printf(arg->prompt, "\n Input Options: %s\n",
(*algorithm[ccp->in.algorithm]->Disp)(&ccp->in.opt));
if (ccp->out.algorithm != -1) {
o = &ccp->out.opt;
for (f = 0; f < ccp->out.algorithm; f++)
if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]))
o = &(*o)->next;
prompt_Printf(arg->prompt, " Output Options: %s\n",
(*algorithm[ccp->out.algorithm]->Disp)(&(*o)->val));
}
prompt_Printf(arg->prompt, "\n Defaults: ");
prompt_Printf(arg->prompt, "FSM retry = %us, max %u Config"
" REQ%s, %u Term REQ%s\n", ccp->cfg.fsm.timeout,
ccp->cfg.fsm.maxreq, ccp->cfg.fsm.maxreq == 1 ? "" : "s",
ccp->cfg.fsm.maxtrm, ccp->cfg.fsm.maxtrm == 1 ? "" : "s");
prompt_Printf(arg->prompt, " deflate windows: ");
prompt_Printf(arg->prompt, "incoming = %d, ", ccp->cfg.deflate.in.winsize);
prompt_Printf(arg->prompt, "outgoing = %d\n", ccp->cfg.deflate.out.winsize);
#ifndef NODES
prompt_Printf(arg->prompt, " MPPE: ");
if (ccp->cfg.mppe.keybits)
prompt_Printf(arg->prompt, "%d bits, ", ccp->cfg.mppe.keybits);
else
prompt_Printf(arg->prompt, "any bits, ");
switch (ccp->cfg.mppe.state) {
case MPPE_STATEFUL:
prompt_Printf(arg->prompt, "stateful");
break;
case MPPE_STATELESS:
prompt_Printf(arg->prompt, "stateless");
break;
case MPPE_ANYSTATE:
prompt_Printf(arg->prompt, "any state");
break;
}
prompt_Printf(arg->prompt, "%s\n",
ccp->cfg.mppe.required ? ", required" : "");
#endif
prompt_Printf(arg->prompt, "\n DEFLATE: %s\n",
command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE]));
prompt_Printf(arg->prompt, " PREDICTOR1: %s\n",
command_ShowNegval(ccp->cfg.neg[CCP_NEG_PRED1]));
prompt_Printf(arg->prompt, " DEFLATE24: %s\n",
command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE24]));
#ifndef NODES
prompt_Printf(arg->prompt, " MPPE: %s\n",
command_ShowNegval(ccp->cfg.neg[CCP_NEG_MPPE]));
#endif
return 0;
}
void
ccp_SetupCallbacks(struct ccp *ccp)
{
ccp->fsm.fn = &ccp_Callbacks;
ccp->fsm.FsmTimer.name = ccp_TimerNames[0];
ccp->fsm.OpenTimer.name = ccp_TimerNames[1];
ccp->fsm.StoppedTimer.name = ccp_TimerNames[2];
}
void
ccp_Init(struct ccp *ccp, struct bundle *bundle, struct link *l,
const struct fsm_parent *parent)
{
/* Initialise ourselves */
fsm_Init(&ccp->fsm, "CCP", PROTO_CCP, 1, CCP_MAXCODE, LogCCP,
bundle, l, parent, &ccp_Callbacks, ccp_TimerNames);
ccp->cfg.deflate.in.winsize = 0;
ccp->cfg.deflate.out.winsize = 15;
ccp->cfg.fsm.timeout = DEF_FSMRETRY;
ccp->cfg.fsm.maxreq = DEF_FSMTRIES;
ccp->cfg.fsm.maxtrm = DEF_FSMTRIES;
ccp->cfg.neg[CCP_NEG_DEFLATE] = NEG_ENABLED|NEG_ACCEPTED;
ccp->cfg.neg[CCP_NEG_PRED1] = NEG_ENABLED|NEG_ACCEPTED;
ccp->cfg.neg[CCP_NEG_DEFLATE24] = 0;
#ifndef NODES
ccp->cfg.mppe.keybits = 0;
ccp->cfg.mppe.state = MPPE_ANYSTATE;
ccp->cfg.mppe.required = 0;
ccp->cfg.neg[CCP_NEG_MPPE] = NEG_ENABLED|NEG_ACCEPTED;
#endif
ccp_Setup(ccp);
}
void
ccp_Setup(struct ccp *ccp)
{
/* Set ourselves up for a startup */
ccp->fsm.open_mode = 0;
ccp->his_proto = ccp->my_proto = -1;
ccp->reset_sent = ccp->last_reset = -1;
ccp->in.algorithm = ccp->out.algorithm = -1;
ccp->in.state = ccp->out.state = NULL;
ccp->in.opt.hdr.id = -1;
ccp->out.opt = NULL;
ccp->his_reject = ccp->my_reject = 0;
ccp->uncompout = ccp->compout = 0;
ccp->uncompin = ccp->compin = 0;
}
/*
* Is ccp *REQUIRED* ?
* We ask each of the configured ccp protocols if they're required and
* return TRUE if they are.
*
* It's not possible for the peer to reject a required ccp protocol
* without our state machine bringing the supporting lcp layer down.
*
* If ccp is required but not open, the NCP layer should not push
* any data into the link.
*/
int
ccp_Required(struct ccp *ccp)
{
int f;
for (f = 0; f < NALGORITHMS; f++)
if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) &&
(*algorithm[f]->Required)(&ccp->fsm))
return 1;
return 0;
}
/*
* Report whether it's possible to increase a packet's size after
* compression (and by how much).
*/
int
ccp_MTUOverhead(struct ccp *ccp)
{
if (ccp->fsm.state == ST_OPENED && ccp->out.algorithm >= 0)
return algorithm[ccp->out.algorithm]->o.MTUOverhead;
return 0;
}
static void
CcpInitRestartCounter(struct fsm *fp, int what)
{
/* Set fsm timer load */
struct ccp *ccp = fsm2ccp(fp);
fp->FsmTimer.load = ccp->cfg.fsm.timeout * SECTICKS;
switch (what) {
case FSM_REQ_TIMER:
fp->restart = ccp->cfg.fsm.maxreq;
break;
case FSM_TRM_TIMER:
fp->restart = ccp->cfg.fsm.maxtrm;
break;
default:
fp->restart = 1;
break;
}
}
static void
CcpSendConfigReq(struct fsm *fp)
{
/* Send config REQ please */
struct ccp *ccp = fsm2ccp(fp);
struct ccp_opt **o;
u_char *cp, buff[100];
int f, alloc;
cp = buff;
o = &ccp->out.opt;
alloc = ccp->his_reject == 0 && ccp->out.opt == NULL;
ccp->my_proto = -1;
ccp->out.algorithm = -1;
for (f = 0; f < NALGORITHMS; f++)
if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) &&
!REJECTED(ccp, algorithm[f]->id) &&
(*algorithm[f]->Usable)(fp)) {
if (!alloc)
for (o = &ccp->out.opt; *o != NULL; o = &(*o)->next)
if ((*o)->val.hdr.id == algorithm[f]->id && (*o)->algorithm == f)
break;
if (alloc || *o == NULL) {
*o = (struct ccp_opt *)malloc(sizeof(struct ccp_opt));
(*o)->val.hdr.id = algorithm[f]->id;
(*o)->val.hdr.len = 2;
(*o)->next = NULL;
(*o)->algorithm = f;
(*algorithm[f]->o.OptInit)(fp->bundle, &(*o)->val, &ccp->cfg);
}
if (cp + (*o)->val.hdr.len > buff + sizeof buff) {
log_Printf(LogERROR, "%s: CCP REQ buffer overrun !\n", fp->link->name);
break;
}
memcpy(cp, &(*o)->val, (*o)->val.hdr.len);
cp += (*o)->val.hdr.len;
ccp->my_proto = (*o)->val.hdr.id;
ccp->out.algorithm = f;
if (alloc)
o = &(*o)->next;
}
fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, cp - buff, MB_CCPOUT);
}
void
ccp_SendResetReq(struct fsm *fp)
{
/* We can't read our input - ask peer to reset */
struct ccp *ccp = fsm2ccp(fp);
ccp->reset_sent = fp->reqid;
ccp->last_reset = -1;
fsm_Output(fp, CODE_RESETREQ, fp->reqid, NULL, 0, MB_CCPOUT);
}
static void
CcpSentTerminateReq(struct fsm *fp)
{
/* Term REQ just sent by FSM */
}
static void
CcpSendTerminateAck(struct fsm *fp, u_char id)
{
/* Send Term ACK please */
fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_CCPOUT);
}
static int
CcpRecvResetReq(struct fsm *fp)
{
/* Got a reset REQ, reset outgoing dictionary */
struct ccp *ccp = fsm2ccp(fp);
if (ccp->out.state == NULL)
return 1;
return (*algorithm[ccp->out.algorithm]->o.Reset)(ccp->out.state);
}
static void
CcpLayerStart(struct fsm *fp)
{
/* We're about to start up ! */
struct ccp *ccp = fsm2ccp(fp);
log_Printf(LogCCP, "%s: LayerStart.\n", fp->link->name);
fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3;
}
static void
CcpLayerDown(struct fsm *fp)
{
/* About to come down */
struct ccp *ccp = fsm2ccp(fp);
struct ccp_opt *next;
log_Printf(LogCCP, "%s: LayerDown.\n", fp->link->name);
if (ccp->in.state != NULL) {
(*algorithm[ccp->in.algorithm]->i.Term)(ccp->in.state);
ccp->in.state = NULL;
ccp->in.algorithm = -1;
}
if (ccp->out.state != NULL) {
(*algorithm[ccp->out.algorithm]->o.Term)(ccp->out.state);
ccp->out.state = NULL;
ccp->out.algorithm = -1;
}
ccp->his_reject = ccp->my_reject = 0;
while (ccp->out.opt) {
next = ccp->out.opt->next;
free(ccp->out.opt);
ccp->out.opt = next;
}
ccp_Setup(ccp);
}
static void
CcpLayerFinish(struct fsm *fp)
{
/* We're now down */
struct ccp *ccp = fsm2ccp(fp);
struct ccp_opt *next;
log_Printf(LogCCP, "%s: LayerFinish.\n", fp->link->name);
/*
* Nuke options that may be left over from sending a REQ but never
* coming up.
*/
while (ccp->out.opt) {
next = ccp->out.opt->next;
free(ccp->out.opt);
ccp->out.opt = next;
}
if (ccp_Required(ccp)) {
if (fp->link->lcp.fsm.state == ST_OPENED)
log_Printf(LogLCP, "%s: Closing due to CCP completion\n", fp->link->name);
fsm_Close(&fp->link->lcp.fsm);
}
}
/* Called when CCP has reached the OPEN state */
static int
CcpLayerUp(struct fsm *fp)
{
/* We're now up */
struct ccp *ccp = fsm2ccp(fp);
struct ccp_opt **o;
int f, fail;
for (f = fail = 0; f < NALGORITHMS; f++)
if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) &&
(*algorithm[f]->Required)(&ccp->fsm) &&
(ccp->in.algorithm != f || ccp->out.algorithm != f)) {
/* Blow it all away - we haven't negotiated a required algorithm */
log_Printf(LogWARN, "%s: Failed to negotiate (required) %s\n",
fp->link->name, protoname(algorithm[f]->id));
fail = 1;
}
if (fail) {
ccp->his_proto = ccp->my_proto = -1;
fsm_Close(fp);
fsm_Close(&fp->link->lcp.fsm);
return 0;
}
log_Printf(LogCCP, "%s: LayerUp.\n", fp->link->name);
if (ccp->in.state == NULL && ccp->in.algorithm >= 0 &&
ccp->in.algorithm < NALGORITHMS) {
ccp->in.state = (*algorithm[ccp->in.algorithm]->i.Init)
(fp->bundle, &ccp->in.opt);
if (ccp->in.state == NULL) {
log_Printf(LogERROR, "%s: %s (in) initialisation failure\n",
fp->link->name, protoname(ccp->his_proto));
ccp->his_proto = ccp->my_proto = -1;
fsm_Close(fp);
return 0;
}
}
o = &ccp->out.opt;
for (f = 0; f < ccp->out.algorithm; f++)
if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]))
o = &(*o)->next;
if (ccp->out.state == NULL && ccp->out.algorithm >= 0 &&
ccp->out.algorithm < NALGORITHMS) {
ccp->out.state = (*algorithm[ccp->out.algorithm]->o.Init)
(fp->bundle, &(*o)->val);
if (ccp->out.state == NULL) {
log_Printf(LogERROR, "%s: %s (out) initialisation failure\n",
fp->link->name, protoname(ccp->my_proto));
ccp->his_proto = ccp->my_proto = -1;
fsm_Close(fp);
return 0;
}
}
fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3;
log_Printf(LogCCP, "%s: Out = %s[%d], In = %s[%d]\n",
fp->link->name, protoname(ccp->my_proto), ccp->my_proto,
protoname(ccp->his_proto), ccp->his_proto);
return 1;
}
static void
CcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
struct fsm_decode *dec)
{
/* Deal with incoming data */
struct ccp *ccp = fsm2ccp(fp);
int f;
const char *disp;
struct fsm_opt *opt;
if (mode_type == MODE_REQ)
ccp->in.algorithm = -1; /* In case we've received two REQs in a row */
while (end - cp >= sizeof(opt->hdr)) {
if ((opt = fsm_readopt(&cp)) == NULL)
break;
for (f = NALGORITHMS-1; f > -1; f--)
if (algorithm[f]->id == opt->hdr.id)
break;
disp = f == -1 ? "" : (*algorithm[f]->Disp)(opt);
if (disp == NULL)
disp = "";
log_Printf(LogCCP, " %s[%d] %s\n", protoname(opt->hdr.id),
opt->hdr.len, disp);
if (f == -1) {
/* Don't understand that :-( */
if (mode_type == MODE_REQ) {
ccp->my_reject |= (1 << opt->hdr.id);
fsm_rej(dec, opt);
}
} 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, opt, opt->hdr.len);
switch ((*algorithm[f]->i.Set)(fp->bundle, &ccp->in.opt, &ccp->cfg)) {
case MODE_REJ:
fsm_rej(dec, &ccp->in.opt);
break;
case MODE_NAK:
fsm_nak(dec, &ccp->in.opt);
break;
case MODE_ACK:
fsm_ack(dec, &ccp->in.opt);
ccp->his_proto = opt->hdr.id;
ccp->in.algorithm = f; /* This one'll do :-) */
break;
}
} else {
fsm_rej(dec, opt);
}
break;
case MODE_NAK:
for (o = ccp->out.opt; o != NULL; o = o->next)
if (o->val.hdr.id == opt->hdr.id)
break;
if (o == NULL)
log_Printf(LogCCP, "%s: Warning: Ignoring peer NAK of unsent"
" option\n", fp->link->name);
else {
memcpy(&o->val, opt, opt->hdr.len);
if ((*algorithm[f]->o.Set)(fp->bundle, &o->val, &ccp->cfg) ==
MODE_ACK)
ccp->my_proto = algorithm[f]->id;
else {
ccp->his_reject |= (1 << opt->hdr.id);
ccp->my_proto = -1;
if (algorithm[f]->Required(fp)) {
log_Printf(LogWARN, "%s: Cannot understand peers (required)"
" %s negotiation\n", fp->link->name,
protoname(algorithm[f]->id));
fsm_Close(&fp->link->lcp.fsm);
}
}
}
break;
case MODE_REJ:
ccp->his_reject |= (1 << opt->hdr.id);
ccp->my_proto = -1;
if (algorithm[f]->Required(fp)) {
log_Printf(LogWARN, "%s: Peer rejected (required) %s negotiation\n",
fp->link->name, protoname(algorithm[f]->id));
fsm_Close(&fp->link->lcp.fsm);
}
break;
}
}
}
if (mode_type != MODE_NOP) {
fsm_opt_normalise(dec);
if (dec->rejend != dec->rej || dec->nakend != dec->nak) {
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)) {
if (l->ccp.fsm.state != ST_OPENED) {
if (ccp_Required(&l->ccp)) {
/* The NCP layer shouldn't have let this happen ! */
log_Printf(LogERROR, "%s: Unexpected attempt to use an unopened and"
" required CCP layer\n", l->name);
m_freem(bp);
bp = NULL;
}
} else if (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) {
/* 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) {
/* Add incoming Network Layer traffic to our dictionary */
(*algorithm[l->ccp.in.algorithm]->i.DictSetup)
(l->ccp.in.state, &l->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;
}
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_DefaultUsable(struct fsm *fp)
{
return 1;
}
int
ccp_DefaultRequired(struct fsm *fp)
{
return 0;
}
struct layer ccplayer = { LAYER_CCP, "ccp", ccp_LayerPush, ccp_LayerPull };