hdlc.c revision 13760
16059Samurai/* 26059Samurai * PPP High Level Link Control (HDLC) Module 36059Samurai * 46059Samurai * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 56059Samurai * 66059Samurai * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. 76059Samurai * 86059Samurai * Redistribution and use in source and binary forms are permitted 96059Samurai * provided that the above copyright notice and this paragraph are 106059Samurai * duplicated in all such forms and that any documentation, 116059Samurai * advertising materials, and other materials related to such 126059Samurai * distribution and use acknowledge that the software was developed 136059Samurai * by the Internet Initiative Japan, Inc. The name of the 146059Samurai * IIJ may not be used to endorse or promote products derived 156059Samurai * from this software without specific prior written permission. 166059Samurai * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 176059Samurai * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 186059Samurai * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 198857Srgrimes * 2013760Sphk * $Id: hdlc.c,v 1.7 1996/01/11 17:48:46 phk Exp $ 218857Srgrimes * 226059Samurai * TODO: 236059Samurai */ 246059Samurai#include "fsm.h" 256059Samurai#include "hdlc.h" 266059Samurai#include "lcpproto.h" 276059Samurai#include "lcp.h" 286059Samurai#include "lqr.h" 296735Samurai#include "vars.h" 3013389Sphk#include "pred.h" 3113389Sphk#include "modem.h" 3213389Sphk#include "ccp.h" 336059Samurai 346059Samuraistruct hdlcstat { 356059Samurai int badfcs; 366059Samurai int badaddr; 376059Samurai int badcommand; 386059Samurai int unknownproto; 396059Samurai} HdlcStat; 406059Samurai 416059Samuraistatic int ifOutPackets, ifOutOctets, ifOutLQRs; 426059Samuraistatic int ifInPackets, ifInOctets; 436059Samurai 446059Samuraistruct protostat { 456059Samurai u_short number; 466059Samurai char *name; 476059Samurai u_long in_count; 486059Samurai u_long out_count; 496059Samurai} ProtocolStat[] = { 506059Samurai { PROTO_IP, "IP" }, 516059Samurai { PROTO_VJUNCOMP, "VJ_UNCOMP" }, 526059Samurai { PROTO_VJCOMP, "VJ_COMP" }, 536059Samurai { PROTO_COMPD, "COMPD" }, 546059Samurai { PROTO_LCP, "LCP" }, 556059Samurai { PROTO_IPCP, "IPCP" }, 566059Samurai { PROTO_CCP, "CCP" }, 576059Samurai { PROTO_PAP, "PAP" }, 586059Samurai { PROTO_LQR, "LQR" }, 596059Samurai { PROTO_CHAP, "CHAP" }, 606059Samurai { 0, "Others" }, 616059Samurai}; 626059Samurai 6313760Sphkstatic u_short const fcstab[256] = { 646059Samurai/* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 656059Samurai/* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 666059Samurai/* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 676059Samurai/* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 686059Samurai/* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 696059Samurai/* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 706059Samurai/* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 716059Samurai/* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 726059Samurai/* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 736059Samurai/* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 746059Samurai/* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 756059Samurai/* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 766059Samurai/* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 776059Samurai/* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 786059Samurai/* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 796059Samurai/* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 806059Samurai/* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 816059Samurai/* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 826059Samurai/* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 836059Samurai/* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 846059Samurai/* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 856059Samurai/* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 866059Samurai/* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 876059Samurai/* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 886059Samurai/* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 896059Samurai/* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 906059Samurai/* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 916059Samurai/* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 926059Samurai/* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 936059Samurai/* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 946059Samurai/* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 956059Samurai/* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 966059Samurai}; 976059Samurai 986059Samuraivoid 996059SamuraiHdlcInit() 1006059Samurai{ 1016059Samurai ifInOctets = ifOutOctets = 0; 1026059Samurai ifInPackets = ifOutPackets = 0; 1036059Samurai ifOutLQRs = 0; 1046059Samurai} 1056059Samurai 1066059Samurai/* 1076059Samurai * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section 1086059Samurai * 2.27 for further details. 1096059Samurai */ 11013760Sphkinline u_short 1116059SamuraiHdlcFcs(fcs, cp, len) 1126059Samuraiu_short fcs; 1136059Samuraiu_char *cp; 1146059Samuraiint len; 1156059Samurai{ 1166059Samurai while (len--) 1176059Samurai fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; 1186059Samurai return(fcs); 1196059Samurai} 1206059Samurai 1216059Samuraivoid 1226059SamuraiHdlcOutput(int pri, u_short proto, struct mbuf *bp) 1236059Samurai{ 1246059Samurai struct mbuf *mhp, *mfcs; 1256059Samurai struct protostat *statp; 1266059Samurai struct lqrdata *lqr; 1276059Samurai u_char *cp; 1286059Samurai u_short fcs; 1296059Samurai 1306059Samurai if ((proto & 0xfff1) == 0x21) { /* Network Layer protocol */ 1316059Samurai if (CcpFsm.state == ST_OPENED) { 1326059Samurai Pred1Output(pri, proto, bp); 1336059Samurai return; 1346059Samurai } 1356059Samurai } 1366735Samurai if (DEV_IS_SYNC) 1376735Samurai mfcs = NULLBUFF; 1386735Samurai else 1396735Samurai mfcs = mballoc(2, MB_HDLCOUT); 1406059Samurai mhp = mballoc(4, MB_HDLCOUT); 1416059Samurai mhp->cnt = 0; 1426059Samurai cp = MBUF_CTOP(mhp); 1436059Samurai if (proto == PROTO_LCP || LcpInfo.his_acfcomp == 0) { 1446059Samurai *cp++ = HDLC_ADDR; 1456059Samurai *cp++ = HDLC_UI; 1466059Samurai mhp->cnt += 2; 1476059Samurai } 1486059Samurai /* 1496059Samurai * If possible, compress protocol field. 1506059Samurai */ 1516059Samurai if (LcpInfo.his_protocomp && (proto & 0xff00) == 0) { 1526059Samurai *cp++ = proto; 1536059Samurai mhp->cnt++; 1546059Samurai } else { 1556059Samurai *cp++ = proto >> 8; 1566059Samurai *cp = proto & 0377; 1576059Samurai mhp->cnt += 2; 1586059Samurai } 1596059Samurai mhp->next = bp; 1606059Samurai bp->next = mfcs; 1616059Samurai 1626059Samurai lqr = &MyLqrData; 1636059Samurai lqr->PeerOutPackets = ifOutPackets++; 1646059Samurai ifOutOctets += plength(mhp) + 1; 1656059Samurai lqr->PeerOutOctets = ifOutOctets; 1666059Samurai 1676059Samurai if (proto == PROTO_LQR) { 1686059Samurai lqr->MagicNumber = LcpInfo.want_magic; 1696059Samurai lqr->LastOutLQRs = HisLqrData.PeerOutLQRs; 1706059Samurai lqr->LastOutPackets = HisLqrData.PeerOutPackets; 1716059Samurai lqr->LastOutOctets = HisLqrData.PeerOutOctets; 1726059Samurai lqr->PeerInLQRs = HisLqrSave.SaveInLQRs; 1736059Samurai lqr->PeerInPackets = HisLqrSave.SaveInPackets; 1746059Samurai lqr->PeerInDiscards = HisLqrSave.SaveInDiscards; 1756059Samurai lqr->PeerInErrors = HisLqrSave.SaveInErrors; 1766059Samurai lqr->PeerInOctets = HisLqrSave.SaveInOctets; 1776059Samurai lqr->PeerOutLQRs = ++ifOutLQRs; 1786059Samurai LqrDump("LqrOutput", lqr); 1796059Samurai LqrChangeOrder(lqr, (struct lqrdata *)(MBUF_CTOP(bp))); 1806059Samurai } 1816059Samurai 1826735Samurai if (!DEV_IS_SYNC) { 1836735Samurai fcs = HdlcFcs(INITFCS, MBUF_CTOP(mhp), mhp->cnt); 1846735Samurai fcs = HdlcFcs(fcs, MBUF_CTOP(bp), bp->cnt); 1856735Samurai fcs = ~fcs; 1866735Samurai cp = MBUF_CTOP(mfcs); 1876735Samurai *cp++ = fcs & 0377; /* Low byte first!! */ 1886735Samurai *cp++ = fcs >> 8; 1896735Samurai } 1906059Samurai 1916059Samurai LogDumpBp(LOG_HDLC, "HdlcOutput", mhp); 1926059Samurai for (statp = ProtocolStat; statp->number; statp++) 1936059Samurai if (statp->number == proto) 1946059Samurai break; 1956059Samurai statp->out_count++; 1966735Samurai if (DEV_IS_SYNC) 1976735Samurai ModemOutput(pri, mhp); 1986735Samurai else 1996735Samurai AsyncOutput(pri, mhp, proto); 2006059Samurai} 2016059Samurai 20213379Sphkvoid 2036059SamuraiDecodePacket(proto, bp) 2046059Samuraiu_short proto; 2056059Samuraistruct mbuf *bp; 2066059Samurai{ 2076059Samurai#ifdef DEBUG 2086059Samurai logprintf("proto = %04x\n", proto); 2096059Samurai#endif 2109448Samurai u_char *cp; 2119448Samurai 2126059Samurai switch (proto) { 2136059Samurai case PROTO_LCP: 2146059Samurai LcpInput(bp); 2156059Samurai break; 2166059Samurai case PROTO_PAP: 2176059Samurai PapInput(bp); 2186059Samurai break; 2196059Samurai case PROTO_LQR: 2206059Samurai HisLqrSave.SaveInLQRs++; 2216059Samurai LqrInput(bp); 2226059Samurai break; 2236059Samurai case PROTO_CHAP: 2246059Samurai ChapInput(bp); 2256059Samurai break; 2266059Samurai case PROTO_VJUNCOMP: 2276059Samurai case PROTO_VJCOMP: 2286059Samurai bp = VjCompInput(bp, proto); 2296735Samurai if (bp == NULLBUFF) { 2306735Samurai break; 2316735Samurai } 2326059Samurai /* fall down */ 2336059Samurai case PROTO_IP: 2346059Samurai IpInput(bp); 2356059Samurai break; 2366059Samurai case PROTO_IPCP: 2376059Samurai IpcpInput(bp); 2386059Samurai break; 2396059Samurai case PROTO_CCP: 2406059Samurai CcpInput(bp); 2416059Samurai break; 2426059Samurai case PROTO_COMPD: 2436059Samurai Pred1Input(bp); 2446059Samurai break; 2456059Samurai default: 2469448Samurai LogPrintf(LOG_PHASE, "Unknown protocol 0x%04x\n", proto); 2479448Samurai bp->offset -= 2; 2489448Samurai bp->cnt += 2; 2499448Samurai cp = MBUF_CTOP(bp); 2509448Samurai LcpSendProtoRej(cp, bp->cnt); 2516059Samurai HisLqrSave.SaveInDiscards++; 2526059Samurai HdlcStat.unknownproto++; 2536059Samurai pfree(bp); 2546059Samurai break; 2556059Samurai } 2566059Samurai} 2576059Samurai 2586059Samuraiint 2596059SamuraiReportProtStatus() 2606059Samurai{ 2616059Samurai struct protostat *statp; 2626059Samurai int cnt; 2636059Samurai 2646059Samurai statp = ProtocolStat; 2656059Samurai statp--; 2666059Samurai cnt = 0; 2676059Samurai printf(" Protocol in out Protocol in out\n"); 2686059Samurai do { 2696059Samurai statp++; 27013389Sphk printf(" %-9s: %8lu, %8lu", 2716059Samurai statp->name, statp->in_count, statp->out_count); 2726059Samurai if (++cnt == 2) { 2736059Samurai printf("\n"); 2746059Samurai cnt = 0; 2756059Samurai } 2766059Samurai } while (statp->number); 2776059Samurai if (cnt) 2786059Samurai printf("\n"); 2796059Samurai return(1); 2806059Samurai} 2816059Samurai 2826059Samuraiint 2836059SamuraiReportHdlcStatus() 2846059Samurai{ 2856059Samurai struct hdlcstat *hp = &HdlcStat; 2866059Samurai 2876059Samurai printf("HDLC level errors\n\n"); 2886059Samurai printf("FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n", 2896059Samurai hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto); 2906059Samurai return(1); 2916059Samurai} 2926059Samurai 2936059Samuraistatic struct hdlcstat laststat; 2946059Samurai 2956059Samuraivoid 2966059SamuraiHdlcErrorCheck() 2976059Samurai{ 2986059Samurai struct hdlcstat *hp = &HdlcStat; 2996059Samurai struct hdlcstat *op = &laststat; 3006059Samurai 3016059Samurai if (bcmp(hp, op, sizeof(laststat))) { 3029797Sgpalmer LogPrintf(LOG_PHASE, "HDLC errors -> FCS: %u ADDR: %u COMD: %u PROTO: %u\n", 3036059Samurai hp->badfcs - op->badfcs, hp->badaddr - op->badaddr, 3046059Samurai hp->badcommand - op->badcommand, hp->unknownproto - op->unknownproto); 3056059Samurai } 3066059Samurai laststat = HdlcStat; 3076059Samurai} 3086059Samurai 3096059Samuraivoid 3106059SamuraiHdlcInput(struct mbuf *bp) 3116059Samurai{ 3126059Samurai u_short fcs, proto; 3136059Samurai u_char *cp, addr, ctrl; 3146059Samurai struct protostat *statp; 3156059Samurai 3166059Samurai LogDumpBp(LOG_HDLC, "HdlcInput:", bp); 3176735Samurai if (DEV_IS_SYNC) 3186735Samurai fcs = GOODFCS; 3196735Samurai else 3206735Samurai fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt); 3216059Samurai HisLqrSave.SaveInOctets += bp->cnt + 1; 3226059Samurai 3236059Samurai#ifdef DEBUG 3246059Samurai logprintf("fcs = %04x (%s)\n", fcs, (fcs == GOODFCS)? "good" : "bad"); 3256059Samurai#endif 3266059Samurai if (fcs != GOODFCS) { 3276059Samurai HisLqrSave.SaveInErrors++; 3286059Samurai#ifdef DEBUG 3296059Samurai logprintf("Bad FCS\n"); 3306059Samurai#endif 3316059Samurai HdlcStat.badfcs++; 3326059Samurai pfree(bp); 3336059Samurai return; 3346059Samurai } 3356735Samurai if (!DEV_IS_SYNC) 3366735Samurai bp->cnt -= 2; /* discard FCS part */ 3376059Samurai cp = MBUF_CTOP(bp); 3386059Samurai 3396059Samurai ifInPackets++; 3406059Samurai ifInOctets += bp->cnt; 3416059Samurai 3426059Samurai if (!LcpInfo.want_acfcomp) { 3436059Samurai /* 3446059Samurai * We expect that packet is not compressed. 3456059Samurai */ 3466059Samurai addr = *cp++; 3476059Samurai if (addr != HDLC_ADDR) { 3486059Samurai HisLqrSave.SaveInErrors++; 3496059Samurai HdlcStat.badaddr++; 3506059Samurai#ifdef DEBUG 3516059Samurai logprintf("addr %02x\n", *cp); 3526059Samurai#endif 3536059Samurai pfree(bp); 3546059Samurai return; 3556059Samurai } 3566059Samurai 3576059Samurai ctrl = *cp++; 3586059Samurai if (ctrl != HDLC_UI) { 3596059Samurai HisLqrSave.SaveInErrors++; 3606059Samurai HdlcStat.badcommand++; 3616059Samurai#ifdef DEBUG 3626059Samurai logprintf("command %02x\n", *cp); 3636059Samurai#endif 3646059Samurai pfree(bp); 3656059Samurai return; 3666059Samurai } 3676059Samurai bp->offset += 2; 3686059Samurai bp->cnt -= 2; 3696059Samurai } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { 3706059Samurai /* 3716059Samurai * We can receive compressed packet, but peer still send 3726059Samurai * uncompressed packet to me. 3736059Samurai */ 3746059Samurai cp += 2; 3756059Samurai bp->offset += 2; 3766059Samurai bp->cnt -= 2; 3776059Samurai } 3786059Samurai 3796059Samurai if (LcpInfo.want_protocomp) { 3806059Samurai proto = 0; 3816059Samurai cp--; 3826059Samurai do { 3836059Samurai cp++; bp->offset++; bp->cnt--; 3846059Samurai proto = proto << 8; 3856059Samurai proto += *cp; 3866059Samurai } while (!(proto & 1)); 3876059Samurai } else { 3886059Samurai proto = *cp++ << 8; 3896059Samurai proto |= *cp++; 3906059Samurai bp->offset += 2; 3916059Samurai bp->cnt -= 2; 3926059Samurai } 3936059Samurai 3946059Samurai for (statp = ProtocolStat; statp->number; statp++) 3956059Samurai if (statp->number == proto) 3966059Samurai break; 3976059Samurai statp->in_count++; 3986059Samurai HisLqrSave.SaveInPackets++; 3996059Samurai 4006059Samurai DecodePacket(proto, bp); 4016059Samurai} 402