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QTSO.C
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C/C++ Source or Header
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1992-05-15
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10KB
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377 lines
/*
* Data interface with a QTSO vocoder selector card
*/
#include "global.h"
#include "mbuf.h"
#include "proc.h"
#include "iface.h"
#include "internet.h"
#include "ip.h"
#include "slhc.h"
#include "n8250.h"
#include "asy.h"
#include "pktdrvr.h"
#include "socket.h"
#include "devparam.h"
#include "qtso.h"
#include "trace.h"
struct qtso *Qtso;
/* Routines local to this file */
/*
* FCS lookup table as generated by fcsgen.c
*/
static int16 fcstab[256] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
#define pppfcs(fcs, c) ((fcs >> 8) ^ fcstab[(fcs ^ c) & 0x00ff])
#define SP_CHAR 0x20
/* Send IP datagram to QTSO */
int
qtso_send(bp,ifp,gateway,tos)
struct mbuf *bp; /* Buffer to send */
struct iface *ifp; /* Pointer to interface control block */
int32 gateway; /* Ignored (PPP is point-to-point) */
int tos;
{
return (*ifp->output)(ifp,NULLCHAR,NULLCHAR,0,bp);
}
/* Send a packet to QTSO */
int
qtso_output(ifp,dest,source,protocol,data)
struct iface *ifp; /* Pointer to interface control block */
char *dest; /* Dest addr (ignored; point-to-point) */
char *source; /* Source addr (ignored; point-to-point) */
int16 protocol; /* Protocol Type field */
struct mbuf *data; /* Actual data to be sent */
{
return (*ifp->raw)(ifp,data);
}
/* Encode a raw packet in PPP framing, put on link output queue */
static int
qtso_raw(ifp,bp)
struct iface *ifp;
struct mbuf *bp;
{
int16 calc_fcs = HDLC_FCS_START;
struct mbuf *vbp;
register char *cp;
register int c;
int accm = 0;
struct qtso *qp;
qp = ifp->edv;
qp->sendframes++;
dump(ifp,IF_TRACE_OUT,bp);
ifp->rawsndcnt++;
ifp->lastsent = secclock();
/* Allocate output mbuf that's twice as long as the packet.
* This is a worst-case guess (consider a packet full of HDLC_FLAGs!)
*/
if ((vbp = alloc_mbuf((int16)(2*len_p(bp)))) == NULLBUF) {
return -1;
}
cp = vbp->data;
/* Flush out any line garbage */
*cp++ = HDLC_FLAG;
/* Copy input to output, escaping special characters */
while ((c = PULLCHAR(&bp)) != -1) {
/* Fold char value into FCS calculated so far */
calc_fcs = pppfcs(calc_fcs, c);
if ( ((c < SP_CHAR) && (accm & (1L << c)))
|| (c == HDLC_ESC_ASYNC)
|| (c == HDLC_FLAG)) {
*cp++ = HDLC_ESC_ASYNC;
*cp++ = (c ^ HDLC_ESC_COMPL);
} else {
*cp++ = c;
}
}
/* Final FCS calculation */
calc_fcs ^= 0xffff;
c = (calc_fcs & 0x00ff); /* Least significant byte first */
if ( ((c < SP_CHAR) && (accm & (1L << c)))
||(c == HDLC_ESC_ASYNC)
||(c == HDLC_FLAG)) {
*cp++ = HDLC_ESC_ASYNC;
*cp++ = (c ^ HDLC_ESC_COMPL);
} else {
*cp++ = c;
}
c = (calc_fcs >> 8); /* Most significant byte next */
if ( ((c < SP_CHAR) && (accm & (1L << c)))
||(c == HDLC_ESC_ASYNC)
||(c == HDLC_FLAG)) {
*cp++ = HDLC_ESC_ASYNC;
*cp++ = (c ^ HDLC_ESC_COMPL);
} else {
*cp++ = c;
}
/* Tie off the packet */
*cp++ = HDLC_FLAG;
vbp->cnt = cp - vbp->data;
if (ifp->trace & IF_TRACE_RAW)
raw_dump(ifp,IF_TRACE_OUT,vbp);
return asy_send(ifp->dev,vbp);
}
/* Packetize QTSO input from device */
void
qtso_recv(dev,p1,p2)
int dev;
void *p1;
void *p2;
{
struct iface *ifp = p1;
int16 calc_fcs = HDLC_FCS_START;
struct mbuf *raw_bp = NULLBUF;
struct mbuf *head_bp = NULLBUF;
register struct mbuf *tail_bp = NULLBUF;
char *cp; /* next byte in tail mbuf */
register int mode = FALSE;
register int c;
int accm = 0;
struct qtso *qp;
qp = ifp->edv;
while((c = get_asy(dev)) != -1){
#ifdef notdef
if (ifp->trace & IF_TRACE_RAW) {
if ( raw_bp != NULLBUF
|| (raw_bp = alloc_mbuf( LCP_MRU_HI * 2 )) != NULLBUF ) {
*raw_bp->data++ = c;
raw_bp->cnt++;
if ( raw_bp->cnt != 1 && c == HDLC_FLAG ) {
raw_bp->data = (char *)(raw_bp + 1);
raw_dump( ifp, IF_TRACE_IN, raw_bp );
raw_bp->cnt = 0;
}
}
}
#endif
if(c == HDLC_FLAG){
if(mode & PPP_ESCAPED){
/* Frame abort */
qp->aborts++;
} else if(mode & PPP_TOSS){
/* We're ignoring this frame */
free_p(head_bp);
} else if(head_bp != NULLBUF) {
if(calc_fcs != HDLC_FCS_FINAL){
/* CRC error */
qp->crcerrs++;
} else {
/* trim off FCS bytes */
trim_mbuf(&head_bp, len_p(head_bp)-2);
net_route(ifp,head_bp);
qp->goodframes++;
/* Especially on slow machines, serial I/O can be quite
* compute intensive, so release the machine before we
* do the next packet. This will allow this packet to
* go on toward its ultimate destination. [Karn]
*/
pwait(NULL);
}
} else {
/* Flag on idle link */
}
/* setup for next buffer */
mode = FALSE;
head_bp = tail_bp = NULLBUF;
calc_fcs = HDLC_FCS_START;
accm = 0;
if(!(ifp->trace & IF_TRACE_RAW)){
if(raw_bp != NULLBUF){
free_p(raw_bp);
raw_bp = NULLBUF;
}
}
continue;
}
/* We reach here for every byte inside a frame.
* (The order of the following tests is important.)
* Discard spurious control characters.
* Check for escape sequence.
* (Allow escaped escape.)
*/
if(c < SP_CHAR && (accm & (1L << c))){
continue;
} else if(mode & PPP_ESCAPED){
mode &= ~PPP_ESCAPED;
c ^= HDLC_ESC_COMPL;
} else if(c == HDLC_ESC_ASYNC){
mode |= PPP_ESCAPED;
continue;
}
/* We reach here with a byte for the buffer.
* Make sure there is room for it.
*/
if(tail_bp == NULLBUF){
if ((tail_bp = alloc_mbuf(PPP_ALLOC)) == NULLBUF) {
mode |= PPP_TOSS;
continue;
}
head_bp = tail_bp;
cp = tail_bp->data;
} else if(tail_bp->cnt >= tail_bp->size){
/* Current mbuf is full */
if((tail_bp->next = alloc_mbuf(PPP_ALLOC)) == NULLBUF){
/* No memory, drop the whole packet */
head_bp = NULLBUF;
mode |= PPP_TOSS;
continue;
}
tail_bp = tail_bp->next;
cp = tail_bp->data;
}
/* Store the byte, increment counts */
*cp++ = c;
tail_bp->cnt++;
calc_fcs = pppfcs(calc_fcs, c);
}
/* clean up afterward */
free_p(raw_bp);
free_p(head_bp);
ifp->rxproc = NULLPROC;
}
#pragma option -G-
/* Process incoming QTSO packets */
/* (called from network task) */
void
qtso_proc(ifp,bp)
struct iface *ifp;
struct mbuf *bp;
{
if ( ifp == NULLIF ) {
return;
}
if ( bp == NULLBUF ) {
return;
}
/* ip_route(ifp,bp,0); */
qtso_raw(ifp,bp);
/* tputc('.'); */
}
#pragma option -G
/* Initialize QTSO control structures for a Point-to-Point interface */
int
qtso_init(ifp,vj)
struct iface *ifp;
int vj;
{
char *ifn;
struct qtso *qp;
struct mbuf *bp;
char imsg[] = { 0x01, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0 };
qp = (struct qtso *)calloc(1,sizeof(struct qtso));
ifp->edv = qp;
qp->iface = ifp;
setencap(ifp,"QTSO");
ifp->ioctl = asy_ioctl;
ifp->flags = FALSE;
ifp->raw = qtso_raw;
ifp->rxproc = newproc( ifn = if_name( ifp, " receive" ),
320, qtso_recv, ifp->dev, ifp, NULL, 0);
free(ifn);
bp = qdata(imsg,sizeof(imsg));
qtso_raw(ifp,bp);
return 0;
}
int
qtso_free(ifp)
struct iface *ifp;
{
struct qtso *qp,*qp1;
qp = (struct qtso *)ifp->edv;
if(qp == Qtso){
Qtso = qp->next;
} else {
for(qp1 = Qtso;qp1 != NULLQTSO;qp1 = qp1->next)
if(qp1->next == qp)
break;
if(qp1->next == qp){
qp1->next = qp->next;
}
}
return 0;
}
int
doqtso(argc,argv,p)
int argc;
char *argv[];
void *p;
{
struct iface *ifp;
struct qtso *qp;
if((ifp = if_lookup(argv[1])) == NULLIF){
printf("Interface %s unknown\n",argv[1]);
return 1;
}
qp = ifp->edv;
printf("TX Frames %lu, Good rx frames %lu, CRC errs %lu, aborts %lu\n",
qp->sendframes,qp->goodframes,qp->crcerrs,qp->aborts);
return 0;
}