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freebsd/usr.sbin/ppp/ccp.c
Pedro F. Giffuni 1de7b4b805 various: general adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

829 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
*
* $FreeBSD$
*/
#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 || (unsigned)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)
{
unsigned 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];
unsigned f;
int 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 == (int)f)
break;
if (alloc || *o == NULL) {
if ((*o = (struct ccp_opt *)malloc(sizeof(struct ccp_opt))) == NULL) {
log_Printf(LogERROR, "%s: Not enough memory for CCP REQ !\n",
fp->link->name);
break;
}
(*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 __unused)
{
/* 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;
unsigned 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 != (int)f || ccp->out.algorithm != (int)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 < (int)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;
if (ccp->out.algorithm > 0)
for (f = 0; f < (unsigned)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 < (int)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 = (int)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 __unused, 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 __unused, 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 __unused)
{
return 1;
}
int
ccp_DefaultRequired(struct fsm *fp __unused)
{
return 0;
}
struct layer ccplayer = { LAYER_CCP, "ccp", ccp_LayerPush, ccp_LayerPull };
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