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hamradioversion3.0examsandprograms1992.iso
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pktdrvr.c
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C/C++ Source or Header
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1991-03-28
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12KB
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450 lines
/* Driver for FTP Software's packet driver interface. (PC specific code)
* Copyright 1991 Phil Karn, KA9Q
*/
#include <stdio.h>
#include <dos.h>
#include "global.h"
#include "proc.h"
#include "mbuf.h"
#include "netuser.h"
#include "enet.h"
#include "arcnet.h"
#include "ax25.h"
#include "slip.h"
#include "kiss.h"
#include "iface.h"
#include "ec.h"
#include "arp.h"
#include "trace.h"
#include "pktdrvr.h"
#include "config.h"
#include "devparam.h"
static long access_type __ARGS((int intno,int if_class,int if_type,
int if_number, char *type,unsigned typelen,
INTERRUPT (*receiver) __ARGS((void)) ));
static int driver_info __ARGS((int intno,int handle,int *version,
int *class,int *type,int *number,int *basic));
static int release_type __ARGS((int intno,int handle));
static int get_address __ARGS((int intno,int handle,char *buf,int len));
static int pk_raw __ARGS((struct iface *iface,struct mbuf *bp));
static int pk_stop __ARGS((struct iface *iface));
static int send_pkt __ARGS((int intno,char *buffer,unsigned length));
static INTERRUPT (*Pkvec[])() = { pkvec0,pkvec1,pkvec2 };
static struct pktdrvr Pktdrvr[PK_MAX];
static int Derr;
static char Pkt_sig[] = "PKT DRVR"; /* Packet driver signature */
/*
* Send routine for packet driver
*/
int
pk_send(bp,iface,gateway,prec,del,tput,rel)
struct mbuf *bp; /* Buffer to send */
struct iface *iface; /* Pointer to interface control block */
int32 gateway; /* Ignored */
int prec;
int del;
int tput;
int rel;
{
if(iface == NULLIF){
free_p(bp);
return -1;
}
return (*iface->raw)(iface,bp);
}
/* Send raw packet (caller provides header) */
static int
pk_raw(iface,bp)
struct iface *iface; /* Pointer to interface control block */
struct mbuf *bp; /* Data field */
{
register struct pktdrvr *pp;
int16 size;
struct mbuf *bp1;
pp = &Pktdrvr[iface->dev];
size = len_p(bp);
dump(iface,IF_TRACE_OUT,pp->class,bp);
iface->rawsndcnt++;
iface->lastsent = secclock();
/* Perform class-specific processing, if any */
switch(pp->class){
case CL_ETHERNET:
if(size < RUNT){
/* Pad the packet out to the minimum */
if((bp1 = alloc_mbuf(RUNT-size)) == NULLBUF){
free_p(bp);
return -1;
}
memset(bp1->data,0,RUNT-size);
bp1->cnt = RUNT-size;
append(&bp,bp1);
size = RUNT;
}
break;
case CL_KISS:
/* This *really* shouldn't be done here, but it was the
* easiest way. Put the type field for KISS TNC on front.
*/
if((bp1 = pushdown(bp,1)) == NULLBUF){
free_p(bp);
return -1;
}
bp = bp1;
bp->data[0] = PARAM_DATA;
size++;
break;
}
if(bp->next != NULLBUF){
/* Copy to contiguous buffer, since driver can't handle mbufs */
bp1 = copy_p(bp,size);
free_p(bp);
bp = bp1;
if(bp == NULLBUF)
return -1;
}
send_pkt(pp->intno,bp->data,bp->cnt);
free_p(bp);
return 0;
}
/* Packet driver receive routine. Called from an assembler hook that pushes
* the caller's registers on the stack so we can access and modify them.
* This is a rare example of call-by-location in C.
*/
INTERRUPT
pkint(bp, di, si, ds, es, dx, cx, bx, ax, ip, cs, flags, dev)
unsigned short bp, di, si, ds, es, dx, cx, bx, ax, ip, cs, flags;
int dev;
{
register struct pktdrvr *pp;
struct phdr phdr;
if(dev < 0 || dev >= PK_MAX)
return; /* Unknown device */
pp = &Pktdrvr[dev];
if(pp->iface == NULLIF)
return; /* Unknown device */
switch(ax){
case 0: /* Space allocate call */
if((pp->buffer = alloc_mbuf(cx+sizeof(phdr))) != NULLBUF){
es = FP_SEG(pp->buffer->data);
di = FP_OFF(pp->buffer->data+sizeof(phdr));
pp->buffer->cnt = cx + sizeof(phdr);
phdr.iface = pp->iface;
phdr.type = pp->class;
memcpy(&pp->buffer->data[0],(char *)&phdr,sizeof(phdr));
} else {
es = di = 0;
}
break;
case 1: /* Packet complete call */
enqueue(&Hopper,pp->buffer);
pp->buffer = NULLBUF;
break;
default:
break;
}
}
/* Shut down the packet interface */
static int
pk_stop(iface)
struct iface *iface;
{
struct pktdrvr *pp;
pp = &Pktdrvr[iface->dev];
/* Call driver's release_type() entry */
if(release_type(pp->intno,pp->handle1) == -1)
tprintf("%s: release_type error code %u\n",iface->name,Derr);
if(pp->class == CL_ETHERNET || pp->class == CL_ARCNET){
release_type(pp->intno,pp->handle2);
release_type(pp->intno,pp->handle3);
}
pp->iface = NULLIF;
return 0;
}
/* Attach a packet driver to the system
* argv[0]: hardware type, must be "packet"
* argv[1]: software interrupt vector, e.g., x7e
* argv[2]: interface label, e.g., "trw0"
* argv[3]: maximum number of packets allowed on transmit queue, e.g., "5"
* argv[4]: maximum transmission unit, bytes, e.g., "1500"
*/
int
pk_attach(argc,argv,p)
int argc;
char *argv[];
void *p;
{
register struct iface *if_pk;
int class,type;
unsigned int intno;
static char iptype[] = {IP_TYPE >> 8,IP_TYPE};
static char arptype[] = {ARP_TYPE >> 8,ARP_TYPE};
static char revarptype[] = {REVARP_TYPE >> 8, REVARP_TYPE};
long handle;
int i;
#ifdef ARCNET
static char arcip[] = {ARC_IP};
static char arcarp[] = {ARC_ARP};
#endif
long drvvec;
char sig[8]; /* Copy of driver signature "PKT DRVR" */
register struct pktdrvr *pp;
char tmp[25];
for(i=0;i<PK_MAX;i++){
if(Pktdrvr[i].iface == NULLIF)
break;
}
if(i >= PK_MAX){
tprintf("Too many packet drivers\n");
return -1;
}
if(if_lookup(argv[2]) != NULLIF){
tprintf("Interface %s already exists\n",argv[2]);
return -1;
}
intno = htoi(argv[1]);
/* Verify that there's really a packet driver there, so we don't
* go off into the ozone (if there's any left)
*/
drvvec = (long)getvect(intno);
movblock(FP_OFF(drvvec)+3, FP_SEG(drvvec),
FP_OFF(sig),FP_SEG(sig),strlen(Pkt_sig));
if(strncmp(sig,Pkt_sig,strlen(Pkt_sig)) != 0){
tprintf("No packet driver loaded at int 0x%x\n",intno);
return -1;
}
if_pk = (struct iface *)callocw(1,sizeof(struct iface));
if_pk->name = strdup(argv[2]);
if_pk->addr = Ip_addr;
pp = &Pktdrvr[i];
if_pk->mtu = atoi(argv[4]);
if_pk->dev = i;
if_pk->raw = pk_raw;
if_pk->stop = pk_stop;
pp->intno = intno;
pp->iface = if_pk;
/* Version 1.08 of the packet driver spec dropped the handle
* requirement from the driver_info call. However, if we are using
* a version 1.05 packet driver, the following call will fail.
*/
if(driver_info(intno,-1,NULL,&class,&type,NULL,NULL) < 0){
/* Find out by exhaustive search what class this driver is (ugh) */
for(class=1;class<=NCLASS;class++){
/* Store handle in temp long so we can tell an
* error return (-1) from a handle of 0xffff
*/
handle = access_type(intno,class,ANYTYPE,0,iptype,2,
Pkvec[if_pk->dev]);
if(handle != -1 || Derr == TYPE_INUSE){
pp->handle1 = handle;
break;
}
}
/* Now that we know, release it and do it all over again with the
* right type fields
*/
release_type(intno,pp->handle1);
}
switch(class){
case CL_ETHERNET:
pp->handle1 = access_type(intno,class,ANYTYPE,0,iptype,2,
Pkvec[if_pk->dev]);
pp->handle2 = access_type(intno,class,ANYTYPE,0,arptype,2,
Pkvec[if_pk->dev]);
pp->handle3 = access_type(intno,class,ANYTYPE,0,revarptype,2,
Pkvec[if_pk->dev]);
setencap(if_pk,"Ethernet");
/* Get hardware Ethernet address from driver */
if_pk->hwaddr = mallocw(EADDR_LEN);
get_address(intno,pp->handle1,if_pk->hwaddr,EADDR_LEN);
if(if_pk->hwaddr[0] & 1){
tprintf("Warning! Interface '%s' has a multicast address:",
if_pk->name);
tprintf(" (%s)\n",
(*if_pk->iftype->format)(tmp,if_pk->hwaddr));
}
break;
#ifdef ARCNET
case CL_ARCNET:
pp->handle1 = access_type(intno,class,ANYTYPE,0,arcip,1,
Pkvec[if_pk->dev]);
pp->handle2 = access_type(intno,class,ANYTYPE,0,arcarp,1,
Pkvec[if_pk->dev]);
if_pk->send = anet_send;
if_pk->output = anet_output;
/* Get hardware ARCnet address from driver */
if_pk->hwaddr = mallocw(AADDR_LEN);
get_address(intno,pp->handle1,if_pk->hwaddr,AADDR_LEN);
break;
#endif
case CL_SERIAL_LINE:
pp->handle1 = access_type(intno,class,ANYTYPE,0,NULLCHAR,0,
Pkvec[if_pk->dev]);
setencap(if_pk,"SLIP");
break;
#ifdef AX25
case CL_KISS: /* Note that the raw routine puts on the command */
case CL_AX25:
pp->handle1 = access_type(intno,class,ANYTYPE,0,NULLCHAR,0,
Pkvec[if_pk->dev]);
setencap(if_pk,"AX25");
if_pk->hwaddr = mallocw(AXALEN);
memcpy(if_pk->hwaddr,Mycall,AXALEN);
break;
#endif
case CL_SLFP:
pp->handle1 = access_type(intno,class,ANYTYPE,0,NULLCHAR,0,
Pkvec[if_pk->dev]);
if_pk->send = pk_send;
setencap(if_pk,"SLFP");
get_address(intno,pp->handle1,(char *)&if_pk->addr,4);
break;
default:
tprintf("Packet driver has unsupported class %u\n",class);
free(if_pk->name);
free((char *)if_pk);
return -1;
}
pp->class = class;
if_pk->next = Ifaces;
Ifaces = if_pk;
return 0;
}
static long
access_type(intno,if_class,if_type,if_number,type,typelen,receiver)
int intno;
int if_class;
int if_type;
int if_number;
char *type;
unsigned typelen;
INTERRUPT (*receiver)();
{
union REGS regs;
struct SREGS sregs;
segread(&sregs);
regs.h.dl = if_number; /* Number */
sregs.ds = FP_SEG(type); /* Packet type template */
regs.x.si = FP_OFF(type);
regs.x.cx = typelen; /* Length of type */
sregs.es = FP_SEG(receiver); /* Address of receive handler */
regs.x.di = FP_OFF(receiver);
regs.x.bx = if_type; /* Type */
regs.h.ah = ACCESS_TYPE; /* Access_type() function */
regs.h.al = if_class; /* Class */
int86x(intno,®s,®s,&sregs);
if(regs.x.cflag){
Derr = regs.h.dh;
return -1;
} else
return regs.x.ax;
}
static int
release_type(intno,handle)
int intno;
int handle;
{
union REGS regs;
regs.x.bx = handle;
regs.h.ah = RELEASE_TYPE;
int86(intno,®s,®s);
if(regs.x.cflag){
Derr = regs.h.dh;
return -1;
} else
return 0;
}
static int
send_pkt(intno,buffer,length)
int intno;
char *buffer;
unsigned length;
{
union REGS regs;
struct SREGS sregs;
segread(&sregs);
sregs.ds = FP_SEG(buffer);
sregs.es = FP_SEG(buffer); /* for buggy univation pkt driver - CDY */
regs.x.si = FP_OFF(buffer);
regs.x.cx = length;
regs.h.ah = SEND_PKT;
int86x(intno,®s,®s,&sregs);
if(regs.x.cflag){
Derr = regs.h.dh;
return -1;
} else
return 0;
}
static int
driver_info(intno,handle,version,class,type,number,basic)
int intno;
int handle;
int *version,*class,*type,*number,*basic;
{
union REGS regs;
regs.x.bx = handle;
regs.h.ah = DRIVER_INFO;
regs.h.al = 0xff;
int86(intno,®s,®s);
if(regs.x.cflag){
Derr = regs.h.dh;
return -1;
}
if(version != NULL)
*version = regs.x.bx;
if(class != NULL)
*class = regs.h.ch;
if(type != NULL)
*type = regs.x.dx;
if(number != NULL)
*number = regs.h.cl;
if(basic != NULL)
*basic = regs.h.al;
return 0;
}
static int
get_address(intno,handle,buf,len)
int intno;
int handle;
char *buf;
int len;
{
union REGS regs;
struct SREGS sregs;
segread(&sregs);
sregs.es = FP_SEG(buf);
regs.x.di = FP_OFF(buf);
regs.x.cx = len;
regs.x.bx = handle;
regs.h.ah = GET_ADDRESS;
int86x(intno,®s,®s,&sregs);
if(regs.x.cflag){
Derr = regs.h.dh;
return -1;
}
return 0;
}