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- /*
- * 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;
- }
-
-