442f849547
(LCP/CCP/IPCP), one for urgent IP traffic and one for everything else. o Add the ``set urgent'' command for adjusting the list of urgent port numbers. The default urgent ports are 21, 22, 23, 513, 514, 543 and 544 (Ports 80 and 81 have been removed from the default priority list). o Increase the buffered packet threshold from 20 to 30. o Report the number of packets in the IP output queue and the list of urgent ports under ``show ipcp''.
1046 lines
26 KiB
C
1046 lines
26 KiB
C
/*
|
|
* PPP Finite State Machine for LCP/IPCP
|
|
*
|
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
|
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* Copyright (C) 1993, 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,
|
|
* advertising materials, and other materials related to such
|
|
* 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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|
*/
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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 <string.h>
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#include <termios.h>
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#include "layer.h"
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#include "ua.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 "iplist.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "throughput.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 "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "mp.h"
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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#include "bundle.h"
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#include "async.h"
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#include "physical.h"
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#include "proto.h"
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|
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static void FsmSendConfigReq(struct fsm *);
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static void FsmSendTerminateReq(struct fsm *);
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static void FsmInitRestartCounter(struct fsm *, int);
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typedef void (recvfn)(struct fsm *, struct fsmheader *, struct mbuf *);
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static recvfn FsmRecvConfigReq, FsmRecvConfigAck, FsmRecvConfigNak,
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FsmRecvConfigRej, FsmRecvTermReq, FsmRecvTermAck,
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FsmRecvCodeRej, FsmRecvProtoRej, FsmRecvEchoReq,
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FsmRecvEchoRep, FsmRecvDiscReq, FsmRecvIdent,
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FsmRecvTimeRemain, FsmRecvResetReq, FsmRecvResetAck;
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static const struct fsmcodedesc {
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recvfn *recv;
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unsigned check_reqid : 1;
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unsigned inc_reqid : 1;
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const char *name;
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} FsmCodes[] = {
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{ FsmRecvConfigReq, 0, 0, "ConfigReq" },
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{ FsmRecvConfigAck, 1, 1, "ConfigAck" },
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{ FsmRecvConfigNak, 1, 1, "ConfigNak" },
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{ FsmRecvConfigRej, 1, 1, "ConfigRej" },
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{ FsmRecvTermReq, 0, 0, "TerminateReq" },
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{ FsmRecvTermAck, 1, 1, "TerminateAck" },
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{ FsmRecvCodeRej, 0, 0, "CodeRej" },
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{ FsmRecvProtoRej, 0, 0, "ProtocolRej" },
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{ FsmRecvEchoReq, 0, 0, "EchoRequest" },
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{ FsmRecvEchoRep, 0, 0, "EchoReply" },
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{ FsmRecvDiscReq, 0, 0, "DiscardReq" },
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{ FsmRecvIdent, 0, 0, "Ident" },
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{ FsmRecvTimeRemain,0, 0, "TimeRemain" },
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{ FsmRecvResetReq, 0, 0, "ResetReq" },
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{ FsmRecvResetAck, 0, 1, "ResetAck" }
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};
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|
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static const char *
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Code2Nam(u_int code)
|
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{
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if (code == 0 || code > sizeof FsmCodes / sizeof FsmCodes[0])
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return "Unknown";
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return FsmCodes[code-1].name;
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}
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const char *
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State2Nam(u_int state)
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{
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static const char *StateNames[] = {
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"Initial", "Starting", "Closed", "Stopped", "Closing", "Stopping",
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"Req-Sent", "Ack-Rcvd", "Ack-Sent", "Opened",
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};
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if (state >= sizeof StateNames / sizeof StateNames[0])
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return "unknown";
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return StateNames[state];
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}
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|
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static void
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StoppedTimeout(void *v)
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{
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struct fsm *fp = (struct fsm *)v;
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log_Printf(fp->LogLevel, "%s: Stopped timer expired\n", fp->link->name);
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if (fp->OpenTimer.state == TIMER_RUNNING) {
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log_Printf(LogWARN, "%s: %s: aborting open delay due to stopped timer\n",
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fp->link->name, fp->name);
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timer_Stop(&fp->OpenTimer);
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}
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if (fp->state == ST_STOPPED)
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fsm2initial(fp);
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}
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|
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void
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fsm_Init(struct fsm *fp, const char *name, u_short proto, int mincode,
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int maxcode, int LogLevel, struct bundle *bundle,
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struct link *l, const struct fsm_parent *parent,
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struct fsm_callbacks *fn, const char *timer_names[3])
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{
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fp->name = name;
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fp->proto = proto;
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fp->min_code = mincode;
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fp->max_code = maxcode;
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fp->state = fp->min_code > CODE_TERMACK ? ST_OPENED : ST_INITIAL;
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fp->reqid = 1;
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fp->restart = 1;
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fp->more.reqs = fp->more.naks = fp->more.rejs = 3;
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memset(&fp->FsmTimer, '\0', sizeof fp->FsmTimer);
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memset(&fp->OpenTimer, '\0', sizeof fp->OpenTimer);
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memset(&fp->StoppedTimer, '\0', sizeof fp->StoppedTimer);
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fp->LogLevel = LogLevel;
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fp->link = l;
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fp->bundle = bundle;
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fp->parent = parent;
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fp->fn = fn;
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fp->FsmTimer.name = timer_names[0];
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fp->OpenTimer.name = timer_names[1];
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fp->StoppedTimer.name = timer_names[2];
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}
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static void
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NewState(struct fsm *fp, int new)
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{
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log_Printf(fp->LogLevel, "%s: State change %s --> %s\n",
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fp->link->name, State2Nam(fp->state), State2Nam(new));
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if (fp->state == ST_STOPPED && fp->StoppedTimer.state == TIMER_RUNNING)
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timer_Stop(&fp->StoppedTimer);
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fp->state = new;
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if ((new >= ST_INITIAL && new <= ST_STOPPED) || (new == ST_OPENED)) {
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timer_Stop(&fp->FsmTimer);
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if (new == ST_STOPPED && fp->StoppedTimer.load) {
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timer_Stop(&fp->StoppedTimer);
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fp->StoppedTimer.func = StoppedTimeout;
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fp->StoppedTimer.arg = (void *) fp;
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timer_Start(&fp->StoppedTimer);
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}
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}
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}
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void
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fsm_Output(struct fsm *fp, u_int code, u_int id, u_char *ptr, int count,
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int mtype)
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{
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int plen;
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struct fsmheader lh;
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struct mbuf *bp;
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if (log_IsKept(fp->LogLevel)) {
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log_Printf(fp->LogLevel, "%s: Send%s(%d) state = %s\n",
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fp->link->name, Code2Nam(code), id, State2Nam(fp->state));
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switch (code) {
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case CODE_CONFIGREQ:
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case CODE_CONFIGACK:
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case CODE_CONFIGREJ:
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case CODE_CONFIGNAK:
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(*fp->fn->DecodeConfig)(fp, ptr, count, MODE_NOP, NULL);
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if (count < sizeof(struct fsmconfig))
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log_Printf(fp->LogLevel, " [EMPTY]\n");
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break;
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}
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}
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plen = sizeof(struct fsmheader) + count;
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lh.code = code;
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lh.id = id;
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lh.length = htons(plen);
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bp = mbuf_Alloc(plen, mtype);
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memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
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if (count)
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memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count);
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log_DumpBp(LogDEBUG, "fsm_Output", bp);
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link_PushPacket(fp->link, bp, fp->bundle, LINK_QUEUES(fp->link) - 1,
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fp->proto);
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}
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static void
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FsmOpenNow(void *v)
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{
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struct fsm *fp = (struct fsm *)v;
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timer_Stop(&fp->OpenTimer);
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if (fp->state <= ST_STOPPED) {
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if (fp->state != ST_STARTING) {
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/*
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* In practice, we're only here in ST_STOPPED (when delaying the
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* first config request) or ST_CLOSED (when openmode == 0).
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*
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* The ST_STOPPED bit is breaking the RFC already :-(
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*
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* According to the RFC (1661) state transition table, a TLS isn't
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* required for an Open event when state == Closed, but the RFC
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* must be wrong as TLS hasn't yet been called (since the last TLF)
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* ie, Initial gets an `Up' event, Closing gets a RTA etc.
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*/
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(*fp->fn->LayerStart)(fp);
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(*fp->parent->LayerStart)(fp->parent->object, fp);
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}
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FsmInitRestartCounter(fp, FSM_REQ_TIMER);
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FsmSendConfigReq(fp);
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NewState(fp, ST_REQSENT);
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}
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}
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void
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fsm_Open(struct fsm *fp)
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{
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switch (fp->state) {
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case ST_INITIAL:
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NewState(fp, ST_STARTING);
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(*fp->fn->LayerStart)(fp);
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(*fp->parent->LayerStart)(fp->parent->object, fp);
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break;
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case ST_CLOSED:
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if (fp->open_mode == OPEN_PASSIVE) {
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NewState(fp, ST_STOPPED); /* XXX: This is a hack ! */
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} else if (fp->open_mode > 0) {
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if (fp->open_mode > 1)
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log_Printf(LogPHASE, "%s: Entering STOPPED state for %d seconds\n",
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fp->link->name, fp->open_mode);
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NewState(fp, ST_STOPPED); /* XXX: This is a not-so-bad hack ! */
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timer_Stop(&fp->OpenTimer);
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fp->OpenTimer.load = fp->open_mode * SECTICKS;
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fp->OpenTimer.func = FsmOpenNow;
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fp->OpenTimer.arg = (void *)fp;
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timer_Start(&fp->OpenTimer);
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} else
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FsmOpenNow(fp);
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break;
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case ST_STOPPED: /* XXX: restart option */
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case ST_REQSENT:
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case ST_ACKRCVD:
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case ST_ACKSENT:
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case ST_OPENED: /* XXX: restart option */
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break;
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case ST_CLOSING: /* XXX: restart option */
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case ST_STOPPING: /* XXX: restart option */
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NewState(fp, ST_STOPPING);
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break;
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}
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}
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|
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void
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fsm_Up(struct fsm *fp)
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{
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switch (fp->state) {
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case ST_INITIAL:
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log_Printf(fp->LogLevel, "FSM: Using \"%s\" as a transport\n",
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fp->link->name);
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NewState(fp, ST_CLOSED);
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break;
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case ST_STARTING:
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FsmInitRestartCounter(fp, FSM_REQ_TIMER);
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FsmSendConfigReq(fp);
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NewState(fp, ST_REQSENT);
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break;
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|
default:
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log_Printf(fp->LogLevel, "%s: Oops, Up at %s\n",
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fp->link->name, State2Nam(fp->state));
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break;
|
|
}
|
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}
|
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|
|
void
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fsm_Down(struct fsm *fp)
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{
|
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switch (fp->state) {
|
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case ST_CLOSED:
|
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NewState(fp, ST_INITIAL);
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break;
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case ST_CLOSING:
|
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/* This TLF contradicts the RFC (1661), which ``misses it out'' ! */
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(*fp->fn->LayerFinish)(fp);
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NewState(fp, ST_INITIAL);
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(*fp->parent->LayerFinish)(fp->parent->object, fp);
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break;
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case ST_STOPPED:
|
|
NewState(fp, ST_STARTING);
|
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(*fp->fn->LayerStart)(fp);
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(*fp->parent->LayerStart)(fp->parent->object, fp);
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break;
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case ST_STOPPING:
|
|
case ST_REQSENT:
|
|
case ST_ACKRCVD:
|
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case ST_ACKSENT:
|
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NewState(fp, ST_STARTING);
|
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break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
NewState(fp, ST_STARTING);
|
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(*fp->parent->LayerDown)(fp->parent->object, fp);
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break;
|
|
}
|
|
}
|
|
|
|
void
|
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fsm_Close(struct fsm *fp)
|
|
{
|
|
switch (fp->state) {
|
|
case ST_STARTING:
|
|
(*fp->fn->LayerFinish)(fp);
|
|
NewState(fp, ST_INITIAL);
|
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(*fp->parent->LayerFinish)(fp->parent->object, fp);
|
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break;
|
|
case ST_STOPPED:
|
|
NewState(fp, ST_CLOSED);
|
|
break;
|
|
case ST_STOPPING:
|
|
NewState(fp, ST_CLOSING);
|
|
break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
|
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FsmSendTerminateReq(fp);
|
|
NewState(fp, ST_CLOSING);
|
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(*fp->parent->LayerDown)(fp->parent->object, fp);
|
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break;
|
|
case ST_REQSENT:
|
|
case ST_ACKRCVD:
|
|
case ST_ACKSENT:
|
|
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
|
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FsmSendTerminateReq(fp);
|
|
NewState(fp, ST_CLOSING);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
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|
* Send functions
|
|
*/
|
|
static void
|
|
FsmSendConfigReq(struct fsm *fp)
|
|
{
|
|
if (fp->more.reqs-- > 0 && fp->restart-- > 0) {
|
|
(*fp->fn->SendConfigReq)(fp);
|
|
timer_Start(&fp->FsmTimer); /* Start restart timer */
|
|
} else {
|
|
if (fp->more.reqs < 0)
|
|
log_Printf(LogPHASE, "%s: Too many %s REQs sent - abandoning "
|
|
"negotiation\n", fp->link->name, fp->name);
|
|
fsm_Close(fp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
FsmSendTerminateReq(struct fsm *fp)
|
|
{
|
|
fsm_Output(fp, CODE_TERMREQ, fp->reqid, NULL, 0, MB_UNKNOWN);
|
|
(*fp->fn->SentTerminateReq)(fp);
|
|
timer_Start(&fp->FsmTimer); /* Start restart timer */
|
|
fp->restart--; /* Decrement restart counter */
|
|
}
|
|
|
|
/*
|
|
* Timeout actions
|
|
*/
|
|
static void
|
|
FsmTimeout(void *v)
|
|
{
|
|
struct fsm *fp = (struct fsm *)v;
|
|
|
|
if (fp->restart) {
|
|
switch (fp->state) {
|
|
case ST_CLOSING:
|
|
case ST_STOPPING:
|
|
FsmSendTerminateReq(fp);
|
|
break;
|
|
case ST_REQSENT:
|
|
case ST_ACKSENT:
|
|
FsmSendConfigReq(fp);
|
|
break;
|
|
case ST_ACKRCVD:
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
}
|
|
timer_Start(&fp->FsmTimer);
|
|
} else {
|
|
switch (fp->state) {
|
|
case ST_CLOSING:
|
|
(*fp->fn->LayerFinish)(fp);
|
|
NewState(fp, ST_CLOSED);
|
|
(*fp->parent->LayerFinish)(fp->parent->object, fp);
|
|
break;
|
|
case ST_STOPPING:
|
|
(*fp->fn->LayerFinish)(fp);
|
|
NewState(fp, ST_STOPPED);
|
|
(*fp->parent->LayerFinish)(fp->parent->object, fp);
|
|
break;
|
|
case ST_REQSENT: /* XXX: 3p */
|
|
case ST_ACKSENT:
|
|
case ST_ACKRCVD:
|
|
(*fp->fn->LayerFinish)(fp);
|
|
NewState(fp, ST_STOPPED);
|
|
(*fp->parent->LayerFinish)(fp->parent->object, fp);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
FsmInitRestartCounter(struct fsm *fp, int what)
|
|
{
|
|
timer_Stop(&fp->FsmTimer);
|
|
fp->FsmTimer.func = FsmTimeout;
|
|
fp->FsmTimer.arg = (void *)fp;
|
|
(*fp->fn->InitRestartCounter)(fp, what);
|
|
}
|
|
|
|
/*
|
|
* Actions when receive packets
|
|
*/
|
|
static void
|
|
FsmRecvConfigReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
/* RCR */
|
|
{
|
|
struct fsm_decode dec;
|
|
int plen, flen;
|
|
int ackaction = 0;
|
|
|
|
plen = mbuf_Length(bp);
|
|
flen = ntohs(lhp->length) - sizeof *lhp;
|
|
if (plen < flen) {
|
|
log_Printf(LogWARN, "%s: FsmRecvConfigReq: plen (%d) < flen (%d)\n",
|
|
fp->link->name, plen, flen);
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
|
|
/* Check and process easy case */
|
|
switch (fp->state) {
|
|
case ST_INITIAL:
|
|
if (fp->proto == PROTO_CCP && fp->link->lcp.fsm.state == ST_OPENED) {
|
|
/*
|
|
* ccp_SetOpenMode() leaves us in initial if we're disabling
|
|
* & denying everything.
|
|
*/
|
|
bp = mbuf_Prepend(bp, lhp, sizeof *lhp, 2);
|
|
bp = proto_Prepend(bp, fp->proto, 0, 0);
|
|
bp = mbuf_Contiguous(bp);
|
|
lcp_SendProtoRej(&fp->link->lcp, MBUF_CTOP(bp), bp->cnt);
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
/* Drop through */
|
|
case ST_STARTING:
|
|
log_Printf(fp->LogLevel, "%s: Oops, RCR in %s.\n",
|
|
fp->link->name, State2Nam(fp->state));
|
|
mbuf_Free(bp);
|
|
return;
|
|
case ST_CLOSED:
|
|
(*fp->fn->SendTerminateAck)(fp, lhp->id);
|
|
mbuf_Free(bp);
|
|
return;
|
|
case ST_CLOSING:
|
|
log_Printf(fp->LogLevel, "%s: Error: Got ConfigReq while state = %s\n",
|
|
fp->link->name, State2Nam(fp->state));
|
|
case ST_STOPPING:
|
|
mbuf_Free(bp);
|
|
return;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
|
break;
|
|
}
|
|
|
|
bp = mbuf_Contiguous(bp);
|
|
dec.ackend = dec.ack;
|
|
dec.nakend = dec.nak;
|
|
dec.rejend = dec.rej;
|
|
(*fp->fn->DecodeConfig)(fp, MBUF_CTOP(bp), flen, MODE_REQ, &dec);
|
|
if (flen < sizeof(struct fsmconfig))
|
|
log_Printf(fp->LogLevel, " [EMPTY]\n");
|
|
|
|
if (dec.nakend == dec.nak && dec.rejend == dec.rej)
|
|
ackaction = 1;
|
|
|
|
switch (fp->state) {
|
|
case ST_STOPPED:
|
|
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
|
|
/* Fall through */
|
|
|
|
case ST_OPENED:
|
|
FsmSendConfigReq(fp);
|
|
break;
|
|
}
|
|
|
|
if (dec.rejend != dec.rej)
|
|
fsm_Output(fp, CODE_CONFIGREJ, lhp->id, dec.rej, dec.rejend - dec.rej,
|
|
MB_UNKNOWN);
|
|
if (dec.nakend != dec.nak)
|
|
fsm_Output(fp, CODE_CONFIGNAK, lhp->id, dec.nak, dec.nakend - dec.nak,
|
|
MB_UNKNOWN);
|
|
if (ackaction)
|
|
fsm_Output(fp, CODE_CONFIGACK, lhp->id, dec.ack, dec.ackend - dec.ack,
|
|
MB_UNKNOWN);
|
|
|
|
switch (fp->state) {
|
|
case ST_STOPPED:
|
|
/*
|
|
* According to the RFC (1661) state transition table, a TLS isn't
|
|
* required for a RCR when state == ST_STOPPED, but the RFC
|
|
* must be wrong as TLS hasn't yet been called (since the last TLF)
|
|
*/
|
|
(*fp->fn->LayerStart)(fp);
|
|
(*fp->parent->LayerStart)(fp->parent->object, fp);
|
|
/* Fall through */
|
|
|
|
case ST_OPENED:
|
|
if (ackaction)
|
|
NewState(fp, ST_ACKSENT);
|
|
else
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
case ST_REQSENT:
|
|
if (ackaction)
|
|
NewState(fp, ST_ACKSENT);
|
|
break;
|
|
case ST_ACKRCVD:
|
|
if (ackaction) {
|
|
NewState(fp, ST_OPENED);
|
|
if ((*fp->fn->LayerUp)(fp))
|
|
(*fp->parent->LayerUp)(fp->parent->object, fp);
|
|
else {
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
|
|
FsmSendTerminateReq(fp);
|
|
NewState(fp, ST_CLOSING);
|
|
}
|
|
}
|
|
break;
|
|
case ST_ACKSENT:
|
|
if (!ackaction)
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
}
|
|
mbuf_Free(bp);
|
|
|
|
if (dec.rejend != dec.rej && --fp->more.rejs <= 0) {
|
|
log_Printf(LogPHASE, "%s: Too many %s REJs sent - abandoning negotiation\n",
|
|
fp->link->name, fp->name);
|
|
fsm_Close(fp);
|
|
}
|
|
|
|
if (dec.nakend != dec.nak && --fp->more.naks <= 0) {
|
|
log_Printf(LogPHASE, "%s: Too many %s NAKs sent - abandoning negotiation\n",
|
|
fp->link->name, fp->name);
|
|
fsm_Close(fp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
FsmRecvConfigAck(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
/* RCA */
|
|
{
|
|
switch (fp->state) {
|
|
case ST_CLOSED:
|
|
case ST_STOPPED:
|
|
(*fp->fn->SendTerminateAck)(fp, lhp->id);
|
|
break;
|
|
case ST_CLOSING:
|
|
case ST_STOPPING:
|
|
break;
|
|
case ST_REQSENT:
|
|
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
|
|
NewState(fp, ST_ACKRCVD);
|
|
break;
|
|
case ST_ACKRCVD:
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
case ST_ACKSENT:
|
|
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
|
|
NewState(fp, ST_OPENED);
|
|
if ((*fp->fn->LayerUp)(fp))
|
|
(*fp->parent->LayerUp)(fp->parent->object, fp);
|
|
else {
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
|
|
FsmSendTerminateReq(fp);
|
|
NewState(fp, ST_CLOSING);
|
|
}
|
|
break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
|
break;
|
|
}
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvConfigNak(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
/* RCN */
|
|
{
|
|
struct fsm_decode dec;
|
|
int plen, flen;
|
|
|
|
plen = mbuf_Length(bp);
|
|
flen = ntohs(lhp->length) - sizeof *lhp;
|
|
if (plen < flen) {
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Check and process easy case
|
|
*/
|
|
switch (fp->state) {
|
|
case ST_INITIAL:
|
|
case ST_STARTING:
|
|
log_Printf(fp->LogLevel, "%s: Oops, RCN in %s.\n",
|
|
fp->link->name, State2Nam(fp->state));
|
|
mbuf_Free(bp);
|
|
return;
|
|
case ST_CLOSED:
|
|
case ST_STOPPED:
|
|
(*fp->fn->SendTerminateAck)(fp, lhp->id);
|
|
mbuf_Free(bp);
|
|
return;
|
|
case ST_CLOSING:
|
|
case ST_STOPPING:
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
|
|
bp = mbuf_Contiguous(bp);
|
|
dec.ackend = dec.ack;
|
|
dec.nakend = dec.nak;
|
|
dec.rejend = dec.rej;
|
|
(*fp->fn->DecodeConfig)(fp, MBUF_CTOP(bp), flen, MODE_NAK, &dec);
|
|
if (flen < sizeof(struct fsmconfig))
|
|
log_Printf(fp->LogLevel, " [EMPTY]\n");
|
|
|
|
switch (fp->state) {
|
|
case ST_REQSENT:
|
|
case ST_ACKSENT:
|
|
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
|
|
FsmSendConfigReq(fp);
|
|
break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
|
break;
|
|
case ST_ACKRCVD:
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
}
|
|
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvTermReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
/* RTR */
|
|
{
|
|
switch (fp->state) {
|
|
case ST_INITIAL:
|
|
case ST_STARTING:
|
|
log_Printf(fp->LogLevel, "%s: Oops, RTR in %s\n",
|
|
fp->link->name, State2Nam(fp->state));
|
|
break;
|
|
case ST_CLOSED:
|
|
case ST_STOPPED:
|
|
case ST_CLOSING:
|
|
case ST_STOPPING:
|
|
case ST_REQSENT:
|
|
(*fp->fn->SendTerminateAck)(fp, lhp->id);
|
|
break;
|
|
case ST_ACKRCVD:
|
|
case ST_ACKSENT:
|
|
(*fp->fn->SendTerminateAck)(fp, lhp->id);
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
(*fp->fn->SendTerminateAck)(fp, lhp->id);
|
|
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
|
|
timer_Start(&fp->FsmTimer); /* Start restart timer */
|
|
fp->restart = 0;
|
|
NewState(fp, ST_STOPPING);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
|
/* A delayed ST_STOPPED is now scheduled */
|
|
break;
|
|
}
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvTermAck(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
/* RTA */
|
|
{
|
|
switch (fp->state) {
|
|
case ST_CLOSING:
|
|
(*fp->fn->LayerFinish)(fp);
|
|
NewState(fp, ST_CLOSED);
|
|
(*fp->parent->LayerFinish)(fp->parent->object, fp);
|
|
break;
|
|
case ST_STOPPING:
|
|
(*fp->fn->LayerFinish)(fp);
|
|
NewState(fp, ST_STOPPED);
|
|
(*fp->parent->LayerFinish)(fp->parent->object, fp);
|
|
break;
|
|
case ST_ACKRCVD:
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
|
break;
|
|
}
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvConfigRej(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
/* RCJ */
|
|
{
|
|
struct fsm_decode dec;
|
|
int plen, flen;
|
|
|
|
plen = mbuf_Length(bp);
|
|
flen = ntohs(lhp->length) - sizeof *lhp;
|
|
if (plen < flen) {
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Check and process easy case
|
|
*/
|
|
switch (fp->state) {
|
|
case ST_INITIAL:
|
|
case ST_STARTING:
|
|
log_Printf(fp->LogLevel, "%s: Oops, RCJ in %s.\n",
|
|
fp->link->name, State2Nam(fp->state));
|
|
mbuf_Free(bp);
|
|
return;
|
|
case ST_CLOSED:
|
|
case ST_STOPPED:
|
|
(*fp->fn->SendTerminateAck)(fp, lhp->id);
|
|
mbuf_Free(bp);
|
|
return;
|
|
case ST_CLOSING:
|
|
case ST_STOPPING:
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
|
|
bp = mbuf_Contiguous(bp);
|
|
dec.ackend = dec.ack;
|
|
dec.nakend = dec.nak;
|
|
dec.rejend = dec.rej;
|
|
(*fp->fn->DecodeConfig)(fp, MBUF_CTOP(bp), flen, MODE_REJ, &dec);
|
|
if (flen < sizeof(struct fsmconfig))
|
|
log_Printf(fp->LogLevel, " [EMPTY]\n");
|
|
|
|
switch (fp->state) {
|
|
case ST_REQSENT:
|
|
case ST_ACKSENT:
|
|
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
|
|
FsmSendConfigReq(fp);
|
|
break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
|
break;
|
|
case ST_ACKRCVD:
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
break;
|
|
}
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvCodeRej(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvProtoRej(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
struct physical *p = link2physical(fp->link);
|
|
u_short proto;
|
|
|
|
if (mbuf_Length(bp) < 2) {
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
bp = mbuf_Read(bp, &proto, 2);
|
|
proto = ntohs(proto);
|
|
log_Printf(fp->LogLevel, "%s: -- Protocol 0x%04x (%s) was rejected!\n",
|
|
fp->link->name, proto, hdlc_Protocol2Nam(proto));
|
|
|
|
switch (proto) {
|
|
case PROTO_LQR:
|
|
if (p)
|
|
lqr_Stop(p, LQM_LQR);
|
|
else
|
|
log_Printf(LogERROR, "%s: FsmRecvProtoRej: Not a physical link !\n",
|
|
fp->link->name);
|
|
break;
|
|
case PROTO_CCP:
|
|
if (fp->proto == PROTO_LCP) {
|
|
fp = &fp->link->ccp.fsm;
|
|
/* Despite the RFC (1661), don't do an out-of-place TLF */
|
|
/* (*fp->fn->LayerFinish)(fp); */
|
|
switch (fp->state) {
|
|
case ST_CLOSED:
|
|
case ST_CLOSING:
|
|
NewState(fp, ST_CLOSED);
|
|
default:
|
|
NewState(fp, ST_STOPPED);
|
|
break;
|
|
}
|
|
/* See above */
|
|
/* (*fp->parent->LayerFinish)(fp->parent->object, fp); */
|
|
}
|
|
break;
|
|
case PROTO_IPCP:
|
|
if (fp->proto == PROTO_LCP) {
|
|
log_Printf(LogPHASE, "%s: IPCP protocol reject closes IPCP !\n",
|
|
fp->link->name);
|
|
fsm_Close(&fp->bundle->ncp.ipcp.fsm);
|
|
}
|
|
break;
|
|
case PROTO_MP:
|
|
if (fp->proto == PROTO_LCP) {
|
|
struct lcp *lcp = fsm2lcp(fp);
|
|
|
|
if (lcp->want_mrru && lcp->his_mrru) {
|
|
log_Printf(LogPHASE, "%s: MP protocol reject is fatal !\n",
|
|
fp->link->name);
|
|
fsm_Close(fp);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvEchoReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
struct lcp *lcp = fsm2lcp(fp);
|
|
u_char *cp;
|
|
u_int32_t magic;
|
|
|
|
mbuf_SetType(bp, MB_ECHOIN);
|
|
if (lcp && mbuf_Length(bp) >= 4) {
|
|
cp = MBUF_CTOP(bp);
|
|
ua_ntohl(cp, &magic);
|
|
if (magic != lcp->his_magic) {
|
|
log_Printf(fp->LogLevel, "%s: RecvEchoReq: Error: His magic is bad!!\n",
|
|
fp->link->name);
|
|
/* XXX: We should send terminate request */
|
|
}
|
|
if (fp->state == ST_OPENED) {
|
|
ua_htonl(&lcp->want_magic, cp); /* local magic */
|
|
fsm_Output(fp, CODE_ECHOREP, lhp->id, cp, mbuf_Length(bp), MB_ECHOOUT);
|
|
}
|
|
}
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvEchoRep(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
if (fsm2lcp(fp))
|
|
bp = lqr_RecvEcho(fp, bp);
|
|
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvDiscReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvIdent(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvTimeRemain(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvResetReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
(*fp->fn->RecvResetReq)(fp);
|
|
/*
|
|
* All sendable compressed packets are queued in the first (lowest
|
|
* priority) modem output queue.... dump 'em to the priority queue
|
|
* so that they arrive at the peer before our ResetAck.
|
|
*/
|
|
link_SequenceQueue(fp->link);
|
|
fsm_Output(fp, CODE_RESETACK, lhp->id, NULL, 0, MB_CCPOUT);
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvResetAck(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
(*fp->fn->RecvResetAck)(fp, lhp->id);
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
void
|
|
fsm_Input(struct fsm *fp, struct mbuf *bp)
|
|
{
|
|
int len;
|
|
struct fsmheader lh;
|
|
const struct fsmcodedesc *codep;
|
|
|
|
len = mbuf_Length(bp);
|
|
if (len < sizeof(struct fsmheader)) {
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
bp = mbuf_Read(bp, &lh, sizeof lh);
|
|
if (lh.code < fp->min_code || lh.code > fp->max_code ||
|
|
lh.code > sizeof FsmCodes / sizeof *FsmCodes) {
|
|
/*
|
|
* Use a private id. This is really a response-type packet, but we
|
|
* MUST send a unique id for each REQ....
|
|
*/
|
|
static u_char id;
|
|
|
|
bp = mbuf_Prepend(bp, &lh, sizeof lh, 0);
|
|
bp = mbuf_Contiguous(bp);
|
|
fsm_Output(fp, CODE_CODEREJ, id++, MBUF_CTOP(bp), bp->cnt, MB_UNKNOWN);
|
|
mbuf_Free(bp);
|
|
return;
|
|
}
|
|
|
|
codep = FsmCodes + lh.code - 1;
|
|
if (lh.id != fp->reqid && codep->check_reqid &&
|
|
Enabled(fp->bundle, OPT_IDCHECK)) {
|
|
log_Printf(fp->LogLevel, "%s: Recv%s(%d), dropped (expected %d)\n",
|
|
fp->link->name, codep->name, lh.id, fp->reqid);
|
|
return;
|
|
}
|
|
|
|
log_Printf(fp->LogLevel, "%s: Recv%s(%d) state = %s\n",
|
|
fp->link->name, codep->name, lh.id, State2Nam(fp->state));
|
|
|
|
if (codep->inc_reqid && (lh.id == fp->reqid ||
|
|
(!Enabled(fp->bundle, OPT_IDCHECK) && codep->check_reqid)))
|
|
fp->reqid++; /* That's the end of that ``exchange''.... */
|
|
|
|
(*codep->recv)(fp, &lh, bp);
|
|
}
|
|
|
|
void
|
|
fsm_NullRecvResetReq(struct fsm *fp)
|
|
{
|
|
log_Printf(fp->LogLevel, "%s: Oops - received unexpected reset req\n",
|
|
fp->link->name);
|
|
}
|
|
|
|
void
|
|
fsm_NullRecvResetAck(struct fsm *fp, u_char id)
|
|
{
|
|
log_Printf(fp->LogLevel, "%s: Oops - received unexpected reset ack\n",
|
|
fp->link->name);
|
|
}
|
|
|
|
void
|
|
fsm_Reopen(struct fsm *fp)
|
|
{
|
|
if (fp->state == ST_OPENED) {
|
|
(*fp->fn->LayerDown)(fp);
|
|
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
|
|
FsmSendConfigReq(fp);
|
|
NewState(fp, ST_REQSENT);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
|
}
|
|
}
|
|
|
|
void
|
|
fsm2initial(struct fsm *fp)
|
|
{
|
|
timer_Stop(&fp->FsmTimer);
|
|
timer_Stop(&fp->OpenTimer);
|
|
timer_Stop(&fp->StoppedTimer);
|
|
if (fp->state == ST_STOPPED)
|
|
fsm_Close(fp);
|
|
if (fp->state > ST_INITIAL)
|
|
fsm_Down(fp);
|
|
if (fp->state > ST_INITIAL)
|
|
fsm_Close(fp);
|
|
}
|