1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
12  * to css-dist@cs.utah.edu any improvements that they make and grant
62 static int BpfFd = -1;
67 **  BpfOpen -- Open and initialize a BPF device.
75 **	Side Effects:
116 		syslog(LOG_ERR,"bpf: %s: data-link type %d unsupported",  in BpfOpen()
169 		    { BPF_LD|BPF_B|BPF_ABS,  0, 0, (long)&RMP->hp_llc.dsap },  in BpfOpen()
171 		    { BPF_LD|BPF_H|BPF_ABS,  0, 0, (long)&RMP->hp_llc.cntrl },  in BpfOpen()
173 		    { BPF_LD|BPF_H|BPF_ABS,  0, 0, (long)&RMP->hp_llc.dxsap },  in BpfOpen()
193 **  BPF GetIntfName -- Return the name of a network interface attached to
199 **		errmsg - if no network interface found, *errmsg explains why.
204 **	Side Effects:
215 	static char device[sizeof(ifrp->ifr_name)];  in BpfGetIntfName()
248 		if ((ifrp->ifr_flags & IFF_UP) == 0 ||  in BpfGetIntfName()
250 		    (ifrp->ifr_flags & IFF_LOOPBACK))  in BpfGetIntfName()
252 		    (strcmp(ifrp->ifr_name, "lo0") == 0))  in BpfGetIntfName()
256 		for (cp = ifrp->ifr_name; !isdigit(*cp); ++cp)  in BpfGetIntfName()
271 	(void) strcpy(device, mp->ifr_name);  in BpfGetIntfName()
276 **  BpfRead -- Read packets from a BPF device and fill in `rconn'.
279 **		rconn - filled in with next packet.
280 **		doread - is True if we can issue a read() syscall.
285 **	Side Effects:
292 	static u_int8_t *bp = NULL, *ep = NULL;  in BpfRead()  local
305 			ep = BpfPkt + cc;  in BpfRead()
314 	if (bp < ep) {  in BpfRead()
315 		datlen = bhp->bh_datalen;  in BpfRead()
316 		caplen = bhp->bh_caplen;  in BpfRead()
317 		hdrlen = bhp->bh_hdrlen;  in BpfRead()
327 			rconn->rmplen = caplen;  in BpfRead()
328 			memmove((char *)&rconn->tstamp, (char *)&bhp->bh_tstamp,  in BpfRead()
330 			memmove((char *)&rconn->rmp, (char *)bp + hdrlen, caplen);  in BpfRead()
341 **  BpfWrite -- Write packet to BPF device.
344 **		rconn - packet to send.
349 **	Side Effects:
355 	if (write(BpfFd, (char *)&rconn->rmp, rconn->rmplen) < 0) {  in BpfWrite()
364 **  BpfClose -- Close a BPF device.
372 **	Side Effects:
385 	if (BpfFd == -1)  in BpfClose()
397 	BpfFd = -1;  in BpfClose()