diff options
Diffstat (limited to 'usr.sbin/ppp/hdlc.c')
-rw-r--r-- | usr.sbin/ppp/hdlc.c | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/usr.sbin/ppp/hdlc.c b/usr.sbin/ppp/hdlc.c new file mode 100644 index 0000000..9791ee1 --- /dev/null +++ b/usr.sbin/ppp/hdlc.c @@ -0,0 +1,378 @@ +/* + * PPP High Level Link Control (HDLC) 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: + */ +#include "fsm.h" +#include "hdlc.h" +#include "lcpproto.h" +#include "lcp.h" +#include "lqr.h" + +struct hdlcstat { + int badfcs; + int badaddr; + int badcommand; + int unknownproto; +} HdlcStat; + +static int ifOutPackets, ifOutOctets, ifOutLQRs; +static int ifInPackets, ifInOctets; + +struct protostat { + u_short number; + char *name; + u_long in_count; + u_long out_count; +} ProtocolStat[] = { + { PROTO_IP, "IP" }, + { PROTO_VJUNCOMP, "VJ_UNCOMP" }, + { PROTO_VJCOMP, "VJ_COMP" }, + { PROTO_COMPD, "COMPD" }, + { PROTO_LCP, "LCP" }, + { PROTO_IPCP, "IPCP" }, + { PROTO_CCP, "CCP" }, + { PROTO_PAP, "PAP" }, + { PROTO_LQR, "LQR" }, + { PROTO_CHAP, "CHAP" }, + { 0, "Others" }, +}; + +static u_short fcstab[256] = { +/* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, +/* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, +/* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, +/* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, +/* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, +/* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, +/* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, +/* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, +/* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, +/* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, +/* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, +/* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, +/* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, +/* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, +/* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, +/* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, +/* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, +/* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, +/* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, +/* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, +/* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, +/* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, +/* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, +/* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, +/* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, +/* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, +/* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, +/* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, +/* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, +/* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, +/* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, +/* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 +}; + +void +HdlcInit() +{ + ifInOctets = ifOutOctets = 0; + ifInPackets = ifOutPackets = 0; + ifOutLQRs = 0; +} + +/* + * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section + * 2.27 for further details. + */ +u_short +HdlcFcs(fcs, cp, len) +u_short fcs; +u_char *cp; +int len; +{ + while (len--) + fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; + return(fcs); +} + +void +HdlcOutput(int pri, u_short proto, struct mbuf *bp) +{ + struct mbuf *mhp, *mfcs; + struct protostat *statp; + struct lqrdata *lqr; + u_char *cp; + u_short fcs; + + if ((proto & 0xfff1) == 0x21) { /* Network Layer protocol */ + if (CcpFsm.state == ST_OPENED) { + Pred1Output(pri, proto, bp); + return; + } + } + mfcs = mballoc(2, MB_HDLCOUT); + mhp = mballoc(4, MB_HDLCOUT); + mhp->cnt = 0; + cp = MBUF_CTOP(mhp); + if (proto == PROTO_LCP || LcpInfo.his_acfcomp == 0) { + *cp++ = HDLC_ADDR; + *cp++ = HDLC_UI; + mhp->cnt += 2; + } + /* + * If possible, compress protocol field. + */ + if (LcpInfo.his_protocomp && (proto & 0xff00) == 0) { + *cp++ = proto; + mhp->cnt++; + } else { + *cp++ = proto >> 8; + *cp = proto & 0377; + mhp->cnt += 2; + } + mhp->next = bp; + bp->next = mfcs; + + lqr = &MyLqrData; + lqr->PeerOutPackets = ifOutPackets++; + ifOutOctets += plength(mhp) + 1; + lqr->PeerOutOctets = ifOutOctets; + + if (proto == PROTO_LQR) { + lqr->MagicNumber = LcpInfo.want_magic; + lqr->LastOutLQRs = HisLqrData.PeerOutLQRs; + lqr->LastOutPackets = HisLqrData.PeerOutPackets; + lqr->LastOutOctets = HisLqrData.PeerOutOctets; + lqr->PeerInLQRs = HisLqrSave.SaveInLQRs; + lqr->PeerInPackets = HisLqrSave.SaveInPackets; + lqr->PeerInDiscards = HisLqrSave.SaveInDiscards; + lqr->PeerInErrors = HisLqrSave.SaveInErrors; + lqr->PeerInOctets = HisLqrSave.SaveInOctets; + lqr->PeerOutLQRs = ++ifOutLQRs; + LqrDump("LqrOutput", lqr); + LqrChangeOrder(lqr, (struct lqrdata *)(MBUF_CTOP(bp))); + } + + fcs = HdlcFcs(INITFCS, MBUF_CTOP(mhp), mhp->cnt); + fcs = HdlcFcs(fcs, MBUF_CTOP(bp), bp->cnt); + fcs = ~fcs; + cp = MBUF_CTOP(mfcs); + *cp++ = fcs & 0377; /* Low byte first!! */ + *cp++ = fcs >> 8; + + LogDumpBp(LOG_HDLC, "HdlcOutput", mhp); + for (statp = ProtocolStat; statp->number; statp++) + if (statp->number == proto) + break; + statp->out_count++; + AsyncOutput(pri, mhp, proto); +} + +DecodePacket(proto, bp) +u_short proto; +struct mbuf *bp; +{ +#ifdef DEBUG + logprintf("proto = %04x\n", proto); +#endif + switch (proto) { + case PROTO_LCP: + LcpInput(bp); + break; + case PROTO_PAP: + PapInput(bp); + break; + case PROTO_LQR: + HisLqrSave.SaveInLQRs++; + LqrInput(bp); + break; + case PROTO_CHAP: + ChapInput(bp); + break; + case PROTO_VJUNCOMP: + case PROTO_VJCOMP: + bp = VjCompInput(bp, proto); + /* fall down */ + case PROTO_IP: + IpInput(bp); + break; + case PROTO_IPCP: + IpcpInput(bp); + break; + case PROTO_CCP: + CcpInput(bp); + break; + case PROTO_COMPD: + Pred1Input(bp); + break; + default: + logprintf("Unknown protocol 0x%04x\n", proto); + /* + * XXX: Should send protocol reject. + */ + HisLqrSave.SaveInDiscards++; + HdlcStat.unknownproto++; + pfree(bp); + break; + } +} + +int +ReportProtStatus() +{ + struct protostat *statp; + int cnt; + + statp = ProtocolStat; + statp--; + cnt = 0; + printf(" Protocol in out Protocol in out\n"); + do { + statp++; + printf(" %-9s: %8u, %8u", + statp->name, statp->in_count, statp->out_count); + if (++cnt == 2) { + printf("\n"); + cnt = 0; + } + } while (statp->number); + if (cnt) + printf("\n"); + return(1); +} + +int +ReportHdlcStatus() +{ + struct hdlcstat *hp = &HdlcStat; + + printf("HDLC level errors\n\n"); + printf("FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n", + hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto); + return(1); +} + +static struct hdlcstat laststat; + +void +HdlcErrorCheck() +{ + struct hdlcstat *hp = &HdlcStat; + struct hdlcstat *op = &laststat; + + if (bcmp(hp, op, sizeof(laststat))) { + LogPrintf(LOG_PHASE, "HDLC errros -> FCS: %u ADDR: %u COMD: %u PROTO: %u\n", + hp->badfcs - op->badfcs, hp->badaddr - op->badaddr, + hp->badcommand - op->badcommand, hp->unknownproto - op->unknownproto); + } + laststat = HdlcStat; +} + +void +HdlcInput(struct mbuf *bp) +{ + u_short fcs, proto; + u_char *cp, addr, ctrl; + struct protostat *statp; + + LogDumpBp(LOG_HDLC, "HdlcInput:", bp); + fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt); + HisLqrSave.SaveInOctets += bp->cnt + 1; + +#ifdef DEBUG + logprintf("fcs = %04x (%s)\n", fcs, (fcs == GOODFCS)? "good" : "bad"); +#endif + if (fcs != GOODFCS) { + HisLqrSave.SaveInErrors++; +#ifdef DEBUG + logprintf("Bad FCS\n"); +#endif + HdlcStat.badfcs++; + pfree(bp); + return; + } + bp->cnt -= 2; /* discard FCS part */ + cp = MBUF_CTOP(bp); + + ifInPackets++; + ifInOctets += bp->cnt; + + if (!LcpInfo.want_acfcomp) { + /* + * We expect that packet is not compressed. + */ + addr = *cp++; + if (addr != HDLC_ADDR) { + HisLqrSave.SaveInErrors++; + HdlcStat.badaddr++; +#ifdef DEBUG + logprintf("addr %02x\n", *cp); +#endif + pfree(bp); + return; + } + + ctrl = *cp++; + if (ctrl != HDLC_UI) { + HisLqrSave.SaveInErrors++; + HdlcStat.badcommand++; +#ifdef DEBUG + logprintf("command %02x\n", *cp); +#endif + pfree(bp); + return; + } + bp->offset += 2; + bp->cnt -= 2; + } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { + /* + * We can receive compressed packet, but peer still send + * uncompressed packet to me. + */ + cp += 2; + bp->offset += 2; + bp->cnt -= 2; + } + + if (LcpInfo.want_protocomp) { + proto = 0; + cp--; + do { + cp++; bp->offset++; bp->cnt--; + proto = proto << 8; + proto += *cp; + } while (!(proto & 1)); + } else { + proto = *cp++ << 8; + proto |= *cp++; + bp->offset += 2; + bp->cnt -= 2; + } + + for (statp = ProtocolStat; statp->number; statp++) + if (statp->number == proto) + break; + statp->in_count++; + HisLqrSave.SaveInPackets++; + + DecodePacket(proto, bp); +} |