ab7d88ae2d
the layering. We now ``stack'' layers as soon as we open the device (when we figure out what we're dealing with). A static set of `dispatch' routines are also declared for dealing with incoming packets after they've been `pulled' up through the stacked layers. Physical devices are now assigned handlers based on the device type when they're opened. For the moment there are three device types; ttys, execs and tcps. o Increment version number to 2.2 o Make an entry in [uw]tmp for non-tty -direct invocations (after pap/chap authentication). o Make throughput counters quad_t's o Account for the absolute number of mbuf malloc()s and free()s in ``show mem''. o ``show modem'' becomes ``show physical''.
1053 lines
27 KiB
C
1053 lines
27 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,
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* advertising materials, and other materials related to such
|
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: fsm.c,v 1.41 1999/03/29 08:21:26 brian Exp $
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*
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* TODO:
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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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|
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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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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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|
|
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const char *
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State2Nam(u_int state)
|
|
{
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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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|
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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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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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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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{
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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, MB_FSM);
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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, PRI_LINK, 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;
|
|
default:
|
|
log_Printf(fp->LogLevel, "%s: Oops, Up at %s\n",
|
|
fp->link->name, State2Nam(fp->state));
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
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fsm_Down(struct fsm *fp)
|
|
{
|
|
switch (fp->state) {
|
|
case ST_CLOSED:
|
|
NewState(fp, ST_INITIAL);
|
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break;
|
|
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;
|
|
case ST_STOPPED:
|
|
NewState(fp, ST_STARTING);
|
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(*fp->fn->LayerStart)(fp);
|
|
(*fp->parent->LayerStart)(fp->parent->object, fp);
|
|
break;
|
|
case ST_STOPPING:
|
|
case ST_REQSENT:
|
|
case ST_ACKRCVD:
|
|
case ST_ACKSENT:
|
|
NewState(fp, ST_STARTING);
|
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break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
|
NewState(fp, ST_STARTING);
|
|
(*fp->parent->LayerDown)(fp->parent->object, fp);
|
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break;
|
|
}
|
|
}
|
|
|
|
void
|
|
fsm_Close(struct fsm *fp)
|
|
{
|
|
switch (fp->state) {
|
|
case ST_STARTING:
|
|
(*fp->fn->LayerFinish)(fp);
|
|
NewState(fp, ST_INITIAL);
|
|
(*fp->parent->LayerFinish)(fp->parent->object, fp);
|
|
break;
|
|
case ST_STOPPED:
|
|
NewState(fp, ST_CLOSED);
|
|
break;
|
|
case ST_STOPPING:
|
|
NewState(fp, ST_CLOSING);
|
|
break;
|
|
case ST_OPENED:
|
|
(*fp->fn->LayerDown)(fp);
|
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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);
|
|
break;
|
|
case ST_REQSENT:
|
|
case ST_ACKRCVD:
|
|
case ST_ACKSENT:
|
|
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
|
|
FsmSendTerminateReq(fp);
|
|
NewState(fp, ST_CLOSING);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
(*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.
|
|
*
|
|
* this is a bit smelly... we know that bp has a leading fsmheader.
|
|
*/
|
|
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);
|
|
if (dec.nakend != dec.nak)
|
|
fsm_Output(fp, CODE_CONFIGNAK, lhp->id, dec.nak, dec.nakend - dec.nak);
|
|
if (ackaction)
|
|
fsm_Output(fp, CODE_CONFIGACK, lhp->id, dec.ack, dec.ackend - dec.ack);
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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 *sp, proto;
|
|
|
|
bp = mbuf_Contiguous(bp);
|
|
sp = (u_short *)MBUF_CTOP(bp);
|
|
proto = ntohs(*sp);
|
|
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_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;
|
|
|
|
if (lcp) {
|
|
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));
|
|
}
|
|
}
|
|
mbuf_Free(bp);
|
|
}
|
|
|
|
static void
|
|
FsmRecvEchoRep(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
|
|
{
|
|
struct lcp *lcp = fsm2lcp(fp);
|
|
u_int32_t magic;
|
|
|
|
if (lcp) {
|
|
ua_ntohl(MBUF_CTOP(bp), &magic);
|
|
/* Tolerate echo replies with either magic number */
|
|
if (magic != 0 && magic != lcp->his_magic && magic != lcp->want_magic) {
|
|
log_Printf(LogWARN,
|
|
"%s: RecvEchoRep: Bad magic: expected 0x%08x, got: 0x%08x\n",
|
|
fp->link->name, lcp->his_magic, magic);
|
|
/*
|
|
* XXX: We should send terminate request. But poor implementations may
|
|
* die as a result.
|
|
*/
|
|
}
|
|
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 PRI_NORMAL 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);
|
|
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);
|
|
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 (log_IsKept(LogDEBUG))
|
|
mbuf_Log();
|
|
|
|
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);
|
|
|
|
if (log_IsKept(LogDEBUG))
|
|
mbuf_Log();
|
|
}
|
|
|
|
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);
|
|
}
|