diff options
Diffstat (limited to 'usr.sbin/ppp/hdlc.c')
| -rw-r--r-- | usr.sbin/ppp/hdlc.c | 576 |
1 files changed, 576 insertions, 0 deletions
diff --git a/usr.sbin/ppp/hdlc.c b/usr.sbin/ppp/hdlc.c new file mode 100644 index 000000000000..ca51a647ea2e --- /dev/null +++ b/usr.sbin/ppp/hdlc.c @@ -0,0 +1,576 @@ +/* + * 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: hdlc.c,v 1.27 1998/01/10 01:55:10 brian Exp $ + * + * TODO: + */ +#include <sys/param.h> +#include <netinet/in.h> + +#include <stdio.h> +#include <string.h> +#include <termios.h> + +#include "command.h" +#include "mbuf.h" +#include "log.h" +#include "defs.h" +#include "timer.h" +#include "fsm.h" +#include "hdlc.h" +#include "lcpproto.h" +#include "ipcp.h" +#include "ip.h" +#include "vjcomp.h" +#include "pap.h" +#include "chap.h" +#include "lcp.h" +#include "async.h" +#include "lqr.h" +#include "loadalias.h" +#include "vars.h" +#include "modem.h" +#include "ccp.h" + +static struct hdlcstat { + int badfcs; + int badaddr; + int badcommand; + int unknownproto; +} HdlcStat; + +static int ifOutPackets; +static int ifOutOctets; +static int ifOutLQRs; + +static struct protostat { + u_short number; + const 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 const 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 +}; + +u_char EscMap[33]; + +void +HdlcInit() +{ + ifOutOctets = 0; + ifOutPackets = 0; + ifOutLQRs = 0; +} + +/* + * HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section + * 2.27 for further details. + */ +inline u_short +HdlcFcs(u_short fcs, u_char * cp, int len) +{ + while (len--) + fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff]; + return (fcs); +} + +static inline u_short +HdlcFcsBuf(u_short fcs, struct mbuf *m) +{ + int len; + u_char *pos, *end; + + len = plength(m); + pos = MBUF_CTOP(m); + end = pos + m->cnt; + while (len--) { + fcs = (fcs >> 8) ^ fcstab[(fcs ^ *pos++) & 0xff]; + if (pos == end && len) { + m = m->next; + pos = MBUF_CTOP(m); + end = pos + m->cnt; + } + } + 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) + if (CcpOutput(pri, proto, bp)) + return; + + if (DEV_IS_SYNC) + mfcs = NULL; + else + 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; + while (bp->next != NULL) + bp = bp->next; + bp->next = mfcs; + bp = mhp->next; + + 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))); + } + if (!DEV_IS_SYNC) { + mfcs->cnt = 0; + fcs = HdlcFcsBuf(INITFCS, mhp); + fcs = ~fcs; + cp = MBUF_CTOP(mfcs); + *cp++ = fcs & 0377; /* Low byte first!! */ + *cp++ = fcs >> 8; + mfcs->cnt = 2; + } + LogDumpBp(LogHDLC, "HdlcOutput", mhp); + for (statp = ProtocolStat; statp->number; statp++) + if (statp->number == proto) + break; + statp->out_count++; + + LogPrintf(LogDEBUG, "HdlcOutput: proto = 0x%04x\n", proto); + + if (DEV_IS_SYNC) + ModemOutput(pri, mhp); + else + AsyncOutput(pri, mhp, proto); +} + +/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ +static struct { + u_short from; + u_short to; + const char *name; +} protocols[] = { + { 0x0001, 0x0001, "Padding Protocol" }, + { 0x0003, 0x001f, "reserved (transparency inefficient)" }, + { 0x0021, 0x0021, "Internet Protocol" }, + { 0x0023, 0x0023, "OSI Network Layer" }, + { 0x0025, 0x0025, "Xerox NS IDP" }, + { 0x0027, 0x0027, "DECnet Phase IV" }, + { 0x0029, 0x0029, "Appletalk" }, + { 0x002b, 0x002b, "Novell IPX" }, + { 0x002d, 0x002d, "Van Jacobson Compressed TCP/IP" }, + { 0x002f, 0x002f, "Van Jacobson Uncompressed TCP/IP" }, + { 0x0031, 0x0031, "Bridging PDU" }, + { 0x0033, 0x0033, "Stream Protocol (ST-II)" }, + { 0x0035, 0x0035, "Banyan Vines" }, + { 0x0037, 0x0037, "reserved (until 1993)" }, + { 0x0039, 0x0039, "AppleTalk EDDP" }, + { 0x003b, 0x003b, "AppleTalk SmartBuffered" }, + { 0x003d, 0x003d, "Multi-Link" }, + { 0x003f, 0x003f, "NETBIOS Framing" }, + { 0x0041, 0x0041, "Cisco Systems" }, + { 0x0043, 0x0043, "Ascom Timeplex" }, + { 0x0045, 0x0045, "Fujitsu Link Backup and Load Balancing (LBLB)" }, + { 0x0047, 0x0047, "DCA Remote Lan" }, + { 0x0049, 0x0049, "Serial Data Transport Protocol (PPP-SDTP)" }, + { 0x004b, 0x004b, "SNA over 802.2" }, + { 0x004d, 0x004d, "SNA" }, + { 0x004f, 0x004f, "IP6 Header Compression" }, + { 0x0051, 0x0051, "KNX Bridging Data" }, + { 0x0053, 0x0053, "Encryption" }, + { 0x0055, 0x0055, "Individual Link Encryption" }, + { 0x006f, 0x006f, "Stampede Bridging" }, + { 0x0071, 0x0071, "BAP Bandwidth Allocation Protocol" }, + { 0x0073, 0x0073, "MP+ Protocol" }, + { 0x007d, 0x007d, "reserved (Control Escape)" }, + { 0x007f, 0x007f, "reserved (compression inefficient)" }, + { 0x00cf, 0x00cf, "reserved (PPP NLPID)" }, + { 0x00fb, 0x00fb, "compression on single link in multilink group" }, + { 0x00fd, 0x00fd, "1st choice compression" }, + { 0x00ff, 0x00ff, "reserved (compression inefficient)" }, + { 0x0200, 0x02ff, "(compression inefficient)" }, + { 0x0201, 0x0201, "802.1d Hello Packets" }, + { 0x0203, 0x0203, "IBM Source Routing BPDU" }, + { 0x0205, 0x0205, "DEC LANBridge100 Spanning Tree" }, + { 0x0207, 0x0207, "Cisco Discovery Protocol" }, + { 0x0209, 0x0209, "Netcs Twin Routing" }, + { 0x0231, 0x0231, "Luxcom" }, + { 0x0233, 0x0233, "Sigma Network Systems" }, + { 0x0235, 0x0235, "Apple Client Server Protocol" }, + { 0x1e00, 0x1eff, "(compression inefficient)" }, + { 0x4001, 0x4001, "Cray Communications Control Protocol" }, + { 0x4003, 0x4003, "CDPD Mobile Network Registration Protocol" }, + { 0x4021, 0x4021, "Stacker LZS" }, + { 0x8001, 0x801f, "Not Used - reserved" }, + { 0x8021, 0x8021, "Internet Protocol Control Protocol" }, + { 0x8023, 0x8023, "OSI Network Layer Control Protocol" }, + { 0x8025, 0x8025, "Xerox NS IDP Control Protocol" }, + { 0x8027, 0x8027, "DECnet Phase IV Control Protocol" }, + { 0x8029, 0x8029, "Appletalk Control Protocol" }, + { 0x802b, 0x802b, "Novell IPX Control Protocol" }, + { 0x802d, 0x802d, "reserved" }, + { 0x802f, 0x802f, "reserved" }, + { 0x8031, 0x8031, "Bridging NCP" }, + { 0x8033, 0x8033, "Stream Protocol Control Protocol" }, + { 0x8035, 0x8035, "Banyan Vines Control Protocol" }, + { 0x8037, 0x8037, "reserved till 1993" }, + { 0x8039, 0x8039, "reserved" }, + { 0x803b, 0x803b, "reserved" }, + { 0x803d, 0x803d, "Multi-Link Control Protocol" }, + { 0x803f, 0x803f, "NETBIOS Framing Control Protocol" }, + { 0x8041, 0x8041, "Cisco Systems Control Protocol" }, + { 0x8043, 0x8043, "Ascom Timeplex" }, + { 0x8045, 0x8045, "Fujitsu LBLB Control Protocol" }, + { 0x8047, 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" }, + { 0x8049, 0x8049, "Serial Data Control Protocol (PPP-SDCP)" }, + { 0x804b, 0x804b, "SNA over 802.2 Control Protocol" }, + { 0x804d, 0x804d, "SNA Control Protocol" }, + { 0x804f, 0x804f, "IP6 Header Compression Control Protocol" }, + { 0x8051, 0x8051, "KNX Bridging Control Protocol" }, + { 0x8053, 0x8053, "Encryption Control Protocol" }, + { 0x8055, 0x8055, "Individual Link Encryption Control Protocol" }, + { 0x806f, 0x806f, "Stampede Bridging Control Protocol" }, + { 0x8073, 0x8073, "MP+ Control Protocol" }, + { 0x8071, 0x8071, "BACP Bandwidth Allocation Control Protocol" }, + { 0x807d, 0x807d, "Not Used - reserved" }, + { 0x80cf, 0x80cf, "Not Used - reserved" }, + { 0x80fb, 0x80fb, "compression on single link in multilink group control" }, + { 0x80fd, 0x80fd, "Compression Control Protocol" }, + { 0x80ff, 0x80ff, "Not Used - reserved" }, + { 0x8207, 0x8207, "Cisco Discovery Protocol Control" }, + { 0x8209, 0x8209, "Netcs Twin Routing" }, + { 0x8235, 0x8235, "Apple Client Server Protocol Control" }, + { 0xc021, 0xc021, "Link Control Protocol" }, + { 0xc023, 0xc023, "Password Authentication Protocol" }, + { 0xc025, 0xc025, "Link Quality Report" }, + { 0xc027, 0xc027, "Shiva Password Authentication Protocol" }, + { 0xc029, 0xc029, "CallBack Control Protocol (CBCP)" }, + { 0xc081, 0xc081, "Container Control Protocol" }, + { 0xc223, 0xc223, "Challenge Handshake Authentication Protocol" }, + { 0xc225, 0xc225, "RSA Authentication Protocol" }, + { 0xc227, 0xc227, "Extensible Authentication Protocol" }, + { 0xc26f, 0xc26f, "Stampede Bridging Authorization Protocol" }, + { 0xc281, 0xc281, "Proprietary Authentication Protocol" }, + { 0xc283, 0xc283, "Proprietary Authentication Protocol" }, + { 0xc481, 0xc481, "Proprietary Node ID Authentication Protocol" } +}; + +#define NPROTOCOLS (sizeof protocols/sizeof protocols[0]) + +static const char * +Protocol2Nam(u_short proto) +{ + int f; + + for (f = 0; f < NPROTOCOLS; f++) + if (proto >= protocols[f].from && proto <= protocols[f].to) + return protocols[f].name; + else if (proto < protocols[f].from) + break; + return "unrecognised protocol"; +} + +static void +DecodePacket(u_short proto, struct mbuf * bp) +{ + u_char *cp; + + LogPrintf(LogDEBUG, "DecodePacket: proto = 0x%04x\n", proto); + + /* + * If proto isn't PROTO_COMPD, we still want to pass it to the + * decompression routines so that the dictionary's updated + */ + if (CcpFsm.state == ST_OPENED) + if (proto == PROTO_COMPD) { + if ((bp = CompdInput(&proto, bp)) == NULL) + return; + } else if ((proto & 0xfff1) == 0x21) /* Network Layer protocol */ + CcpDictSetup(proto, bp); + + 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); + if (bp == NULL) { + break; + } + /* fall down */ + case PROTO_IP: + IpInput(bp); + break; + case PROTO_IPCP: + IpcpInput(bp); + break; + case PROTO_CCP: + CcpInput(bp); + break; + default: + LogPrintf(LogPHASE, "Unknown protocol 0x%04x (%s)\n", + proto, Protocol2Nam(proto)); + bp->offset -= 2; + bp->cnt += 2; + cp = MBUF_CTOP(bp); + LcpSendProtoRej(cp, bp->cnt); + HisLqrSave.SaveInDiscards++; + HdlcStat.unknownproto++; + pfree(bp); + break; + } +} + +int +ReportProtStatus(struct cmdargs const *arg) +{ + struct protostat *statp; + int cnt; + + statp = ProtocolStat; + statp--; + cnt = 0; + fprintf(VarTerm, " Protocol in out Protocol in out\n"); + do { + statp++; + fprintf(VarTerm, " %-9s: %8lu, %8lu", + statp->name, statp->in_count, statp->out_count); + if (++cnt == 2) { + fprintf(VarTerm, "\n"); + cnt = 0; + } + } while (statp->number); + if (cnt) + fprintf(VarTerm, "\n"); + return (0); +} + +int +ReportHdlcStatus(struct cmdargs const *arg) +{ + struct hdlcstat *hp = &HdlcStat; + + if (VarTerm) { + fprintf(VarTerm, "HDLC level errors\n\n"); + fprintf(VarTerm, "FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n", + hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto); + } + return 0; +} + +static struct hdlcstat laststat; + +void +HdlcErrorCheck() +{ + struct hdlcstat *hp = &HdlcStat; + struct hdlcstat *op = &laststat; + + if (memcmp(hp, op, sizeof laststat)) { + LogPrintf(LogPHASE, "HDLC errors -> 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(LogHDLC, "HdlcInput:", bp); + if (DEV_IS_SYNC) + fcs = GOODFCS; + else + fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt); + HisLqrSave.SaveInOctets += bp->cnt + 1; + + LogPrintf(LogDEBUG, "HdlcInput: fcs = %04x (%s)\n", + fcs, (fcs == GOODFCS) ? "good" : "bad"); + if (fcs != GOODFCS) { + HisLqrSave.SaveInErrors++; + LogPrintf(LogDEBUG, "HdlcInput: Bad FCS\n"); + HdlcStat.badfcs++; + pfree(bp); + return; + } + if (!DEV_IS_SYNC) + bp->cnt -= 2; /* discard FCS part */ + + if (bp->cnt < 2) { /* XXX: raise this bar ? */ + pfree(bp); + return; + } + cp = MBUF_CTOP(bp); + + if (!LcpInfo.want_acfcomp) { + + /* + * We expect that packet is not compressed. + */ + addr = *cp++; + if (addr != HDLC_ADDR) { + HisLqrSave.SaveInErrors++; + HdlcStat.badaddr++; + LogPrintf(LogDEBUG, "HdlcInput: addr %02x\n", *cp); + pfree(bp); + return; + } + ctrl = *cp++; + if (ctrl != HDLC_UI) { + HisLqrSave.SaveInErrors++; + HdlcStat.badcommand++; + LogPrintf(LogDEBUG, "HdlcInput: %02x\n", *cp); + 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); +} |