/* * PPP IP Control Protocol (IPCP) Module * * Written by Toshiharu OHNO (tony-o@iij.ad.jp) * * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * 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 * by the Internet Initiative Japan, Inc. The name of the * IIJ may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * $Id$ * * TODO: * o More RFC1772 backwoard compatibility */ #include "fsm.h" #include "lcpproto.h" #include "lcp.h" #include "ipcp.h" #include #include #include #include #include #include "slcompress.h" #include "os.h" #include "phase.h" #include "vars.h" #include "alias.h" extern void PutConfValue(); extern void Prompt(); extern struct in_addr ifnetmask; struct ipcpstate IpcpInfo; struct in_range DefMyAddress, DefHisAddress, DefTriggerAddress; #ifdef MSEXT struct in_addr ns_entries[2], nbns_entries[2]; #endif /* MSEXT */ static void IpcpSendConfigReq __P((struct fsm *)); static void IpcpSendTerminateAck __P((struct fsm *)); static void IpcpSendTerminateReq __P((struct fsm *)); static void IpcpDecodeConfig __P((u_char *, int, int)); static void IpcpLayerStart __P((struct fsm *)); static void IpcpLayerFinish __P((struct fsm *)); static void IpcpLayerUp __P((struct fsm *)); static void IpcpLayerDown __P((struct fsm *)); static void IpcpInitRestartCounter __P((struct fsm *)); struct pppTimer IpcpReportTimer; static int lastInOctets, lastOutOctets; #define REJECTED(p, x) (p->his_reject & (1<name, StateNames[fp->state]); printf(" his side: %s, %lx\n", inet_ntoa(icp->his_ipaddr), icp->his_compproto); printf(" my side: %s, %lx\n", inet_ntoa(icp->want_ipaddr), icp->want_compproto); printf("connected: %d secs, idle: %d secs\n\n", ipConnectSecs, ipIdleSecs); printf("Defaults:\n"); printf(" My Address: %s/%d\n", inet_ntoa(DefMyAddress.ipaddr), DefMyAddress.width); printf(" His Address: %s/%d\n", inet_ntoa(DefHisAddress.ipaddr), DefHisAddress.width); printf(" Negotiation: %s/%d\n", inet_ntoa(DefTriggerAddress.ipaddr), DefTriggerAddress.width); } void IpcpDefAddress() { struct hostent *hp; char name[200]; bzero(&DefMyAddress, sizeof(DefMyAddress)); bzero(&DefHisAddress, sizeof(DefHisAddress)); bzero(&DefTriggerAddress, sizeof(DefTriggerAddress)); if (gethostname(name, sizeof(name)) == 0) { hp = gethostbyname(name); if (hp && hp->h_addrtype == AF_INET) { bcopy(hp->h_addr, (char *)&DefMyAddress.ipaddr.s_addr, hp->h_length); } } } void IpcpInit() { struct ipcpstate *icp = &IpcpInfo; FsmInit(&IpcpFsm); bzero(icp, sizeof(struct ipcpstate)); if ((mode & MODE_DEDICATED) && !dstsystem) { icp->want_ipaddr.s_addr = icp->his_ipaddr.s_addr = 0; } else { icp->want_ipaddr.s_addr = DefMyAddress.ipaddr.s_addr; icp->his_ipaddr.s_addr = DefHisAddress.ipaddr.s_addr; } /* * Some implementation of PPP are: * Starting a negotiaion by require sending *special* value as my address, * even though standard of PPP is defined full negotiation based. * (e.g. "0.0.0.0" or Not "0.0.0.0") */ if ( icp->want_ipaddr.s_addr == 0 ) { icp->want_ipaddr.s_addr = DefTriggerAddress.ipaddr.s_addr; } if (Enabled(ConfVjcomp)) icp->want_compproto = (PROTO_VJCOMP << 16) | ((MAX_STATES - 1) << 8); else icp->want_compproto = 0; icp->heis1172 = 0; IpcpFsm.maxconfig = 10; } static void IpcpInitRestartCounter(fp) struct fsm *fp; { fp->FsmTimer.load = VarRetryTimeout * SECTICKS; fp->restart = 5; } static void IpcpSendConfigReq(fp) struct fsm *fp; { u_char *cp; struct ipcpstate *icp = &IpcpInfo; cp = ReqBuff; LogPrintf(LOG_LCP_BIT, "%s: SendConfigReq\n", fp->name); if (!DEV_IS_SYNC || !REJECTED(icp, TY_IPADDR)) PutConfValue(&cp, cftypes, TY_IPADDR, 6, ntohl(icp->want_ipaddr.s_addr)); if (icp->want_compproto && !REJECTED(icp, TY_COMPPROTO)) { if (icp->heis1172) PutConfValue(&cp, cftypes, TY_COMPPROTO, 4, icp->want_compproto >> 16); else PutConfValue(&cp, cftypes, TY_COMPPROTO, 6, icp->want_compproto); } FsmOutput(fp, CODE_CONFIGREQ, fp->reqid++, ReqBuff, cp - ReqBuff); } static void IpcpSendTerminateReq(fp) struct fsm *fp; { /* XXX: No code yet */ } static void IpcpSendTerminateAck(fp) struct fsm *fp; { LogPrintf(LOG_LCP_BIT, " %s: SendTerminateAck\n", fp->name); FsmOutput(fp, CODE_TERMACK, fp->reqid++, NULL, 0); } static void IpcpLayerStart(fp) struct fsm *fp; { LogPrintf(LOG_LCP_BIT, "%s: LayerStart.\n", fp->name); } static void IpcpLayerFinish(fp) struct fsm *fp; { LogPrintf(LOG_LCP_BIT, "%s: LayerFinish.\n", fp->name); LcpClose(); NewPhase(PHASE_TERMINATE); } static void IpcpLayerDown(fp) struct fsm *fp; { LogPrintf(LOG_LCP_BIT, "%s: LayerDown.\n", fp->name); StopTimer(&IpcpReportTimer); } /* * Called when IPCP has reached to OPEN state */ static void IpcpLayerUp(fp) struct fsm *fp; { char tbuff[100]; #ifdef VERBOSE fprintf(stderr, "%s: LayerUp(%d).\r\n", fp->name, fp->state); #endif Prompt(1); LogPrintf(LOG_LCP_BIT, "%s: LayerUp.\n", fp->name); snprintf(tbuff, sizeof(tbuff), "myaddr = %s ", inet_ntoa(IpcpInfo.want_ipaddr)); LogPrintf(LOG_LCP_BIT|LOG_LINK_BIT, " %s hisaddr = %s\n", tbuff, inet_ntoa(IpcpInfo.his_ipaddr)); OsSetIpaddress(IpcpInfo.want_ipaddr, IpcpInfo.his_ipaddr, ifnetmask); OsLinkup(); IpcpStartReport(); StartIdleTimer(); if (mode & MODE_ALIAS) SetAliasAddress(IpcpInfo.want_ipaddr); } void IpcpUp() { FsmUp(&IpcpFsm); LogPrintf(LOG_LCP_BIT, "IPCP Up event!!\n"); } void IpcpOpen() { FsmOpen(&IpcpFsm); } static int AcceptableAddr(prange, ipaddr) struct in_range *prange; struct in_addr ipaddr; { #ifdef DEBUG logprintf("requested = %x ", htonl(ipaddr.s_addr)); logprintf("range = %x", htonl(prange->ipaddr.s_addr)); logprintf("/%x\n", htonl(prange->mask.s_addr)); logprintf("%x, %x\n", htonl(prange->ipaddr.s_addr & prange->mask.s_addr), htonl(ipaddr.s_addr & prange->mask.s_addr)); #endif return((prange->ipaddr.s_addr & prange->mask.s_addr) == (ipaddr.s_addr & prange->mask.s_addr)); } static void IpcpDecodeConfig(cp, plen, mode) u_char *cp; int plen; int mode; { int type, length; u_long *lp, compproto; struct compreq *pcomp; struct in_addr ipaddr, dstipaddr, dnsstuff, ms_info_req; char tbuff[100]; char tbuff2[100]; ackp = AckBuff; nakp = NakBuff; rejp = RejBuff; while (plen >= sizeof(struct fsmconfig)) { if (plen < 0) break; type = *cp; length = cp[1]; if (type <= TY_IPADDR) snprintf(tbuff, sizeof(tbuff), " %s[%d] ", cftypes[type], length); else snprintf(tbuff, sizeof(tbuff), " "); switch (type) { case TY_IPADDR: /* RFC1332 */ lp = (u_long *)(cp + 2); ipaddr.s_addr = *lp; LogPrintf(LOG_LCP_BIT, "%s %s\n", tbuff, inet_ntoa(ipaddr)); switch (mode) { case MODE_REQ: if (!AcceptableAddr(&DefHisAddress, ipaddr)) { /* * If destination address is not acceptable, insist to use * what we want to use. */ bcopy(cp, nakp, 2); bcopy(&IpcpInfo.his_ipaddr.s_addr, nakp+2, length); nakp += length; break; } IpcpInfo.his_ipaddr = ipaddr; bcopy(cp, ackp, length); ackp += length; break; case MODE_NAK: if (AcceptableAddr(&DefMyAddress, ipaddr)) { /* * Use address suggested by peer. */ snprintf(tbuff2, sizeof(tbuff2), "%s changing address: %s ", tbuff, inet_ntoa(IpcpInfo.want_ipaddr)); LogPrintf(LOG_LCP_BIT, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); IpcpInfo.want_ipaddr = ipaddr; } break; case MODE_REJ: IpcpInfo.his_reject |= (1 << type); break; } break; case TY_COMPPROTO: lp = (u_long *)(cp + 2); compproto = htonl(*lp); LogPrintf(LOG_LCP_BIT, "%s %08x\n", tbuff, compproto); switch (mode) { case MODE_REQ: if (!Acceptable(ConfVjcomp)) { bcopy(cp, rejp, length); rejp += length; } else { pcomp = (struct compreq *)(cp + 2); switch (length) { case 4: /* RFC1172 */ if (ntohs(pcomp->proto) == PROTO_VJCOMP) { logprintf("** Peer is speaking RFC1172 compression protocol **\n"); IpcpInfo.heis1172 = 1; IpcpInfo.his_compproto = compproto; bcopy(cp, ackp, length); ackp += length; } else { bcopy(cp, nakp, 2); pcomp->proto = htons(PROTO_VJCOMP); bcopy(&pcomp, nakp + 2, 2); nakp += length; } break; case 6: /* RFC1332 */ if (ntohs(pcomp->proto) == PROTO_VJCOMP && pcomp->slots < MAX_STATES && pcomp->slots > 2) { IpcpInfo.his_compproto = compproto; IpcpInfo.heis1172 = 0; bcopy(cp, ackp, length); ackp += length; } else { bcopy(cp, nakp, 2); pcomp->proto = htons(PROTO_VJCOMP); pcomp->slots = MAX_STATES - 1; pcomp->compcid = 0; bcopy(&pcomp, nakp + 2, sizeof(pcomp)); nakp += length; } break; default: bcopy(cp, rejp, length); rejp += length; break; } } break; case MODE_NAK: LogPrintf(LOG_LCP_BIT, "%s changing compproto: %08x --> %08x\n", tbuff, IpcpInfo.want_compproto, compproto); IpcpInfo.want_compproto = compproto; break; case MODE_REJ: IpcpInfo.his_reject |= (1 << type); break; } break; case TY_IPADDRS: /* RFC1172 */ lp = (u_long *)(cp + 2); ipaddr.s_addr = *lp; lp = (u_long *)(cp + 6); dstipaddr.s_addr = *lp; LogPrintf(LOG_LCP_BIT, "%s %s, ", tbuff, inet_ntoa(ipaddr)); LogPrintf(LOG_LCP_BIT, "%s\n", inet_ntoa(dstipaddr)); switch (mode) { case MODE_REQ: IpcpInfo.his_ipaddr = ipaddr; IpcpInfo.want_ipaddr = dstipaddr; bcopy(cp, ackp, length); ackp += length; break; case MODE_NAK: LogPrintf(LOG_LCP_BIT, "%s changing address: %s ", tbuff, inet_ntoa(IpcpInfo.want_ipaddr)); LogPrintf(LOG_LCP_BIT, "--> %s\n", inet_ntoa(ipaddr)); IpcpInfo.want_ipaddr = ipaddr; IpcpInfo.his_ipaddr = dstipaddr; break; case MODE_REJ: IpcpInfo.his_reject |= (1 << type); break; } break; /* * MS extensions for MS's PPP */ #ifdef MSEXT case TY_PRIMARY_DNS: /* MS PPP DNS negotiation hack */ case TY_SECONDARY_DNS: if( !Enabled( ConfMSExt ) ) { LogPrintf( LOG_LCP, "MS NS req - rejected - msext disabled\n" ); IpcpInfo.my_reject |= ( 1 << type ); bcopy(cp, rejp, length); rejp += length; break; } switch( mode ){ case MODE_REQ: lp = (u_long *)(cp + 2); dnsstuff.s_addr = *lp; ms_info_req.s_addr = ns_entries[((type - TY_PRIMARY_DNS)?1:0)].s_addr; if( dnsstuff.s_addr != ms_info_req.s_addr ) { /* So the client has got the DNS stuff wrong (first request) so well tell 'em how it is */ bcopy( cp, nakp, 2 ); /* copy first two (type/length) */ LogPrintf( LOG_LCP, "MS NS req %d:%s->%s - nak\n", type, inet_ntoa( dnsstuff ), inet_ntoa( ms_info_req )); bcopy( &ms_info_req, nakp+2, length ); nakp += length; break; } /* Otherwise they have it right (this time) so we send a ack packet back confirming it... end of story */ LogPrintf( LOG_LCP, "MS NS req %d:%s ok - ack\n", type, inet_ntoa( ms_info_req )); bcopy( cp, ackp, length ); ackp += length; break; case MODE_NAK: /* what does this mean?? */ LogPrintf(LOG_LCP, "MS NS req %d - NAK??\n", type ); break; case MODE_REJ: /* confused?? me to :) */ LogPrintf(LOG_LCP, "MS NS req %d - REJ??\n", type ); break; } break; case TY_PRIMARY_NBNS: /* MS PPP NetBIOS nameserver hack */ case TY_SECONDARY_NBNS: if( !Enabled( ConfMSExt ) ) { LogPrintf( LOG_LCP, "MS NBNS req - rejected - msext disabled\n" ); IpcpInfo.my_reject |= ( 1 << type ); bcopy( cp, rejp, length ); rejp += length; break; } switch( mode ){ case MODE_REQ: lp = (u_long *)(cp + 2); dnsstuff.s_addr = *lp; ms_info_req.s_addr = nbns_entries[((type - TY_PRIMARY_NBNS)?1:0)].s_addr; if( dnsstuff.s_addr != ms_info_req.s_addr ) { bcopy( cp, nakp, 2 ); bcopy( &ms_info_req.s_addr , nakp+2, length ); LogPrintf( LOG_LCP, "MS NBNS req %d:%s->%s - nak\n", type, inet_ntoa( dnsstuff ), inet_ntoa( ms_info_req )); nakp += length; break; } LogPrintf( LOG_LCP, "MS NBNS req %d:%s ok - ack\n", type, inet_ntoa( ms_info_req )); bcopy( cp, ackp, length ); ackp += length; break; case MODE_NAK: LogPrintf( LOG_LCP, "MS NBNS req %d - NAK??\n", type ); break; case MODE_REJ: LogPrintf( LOG_LCP, "MS NBNS req %d - REJ??\n", type ); break; } break; #endif /* MSEXT */ default: IpcpInfo.my_reject |= (1 << type); bcopy(cp, rejp, length); rejp += length; break; } plen -= length; cp += length; } } void IpcpInput(struct mbuf *bp) { FsmInput(&IpcpFsm, bp); }