2 * Copyright (c) 1988, 1992 The University of Utah and the Center
3 * for Software Science (CSS).
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * the Center for Software Science of the University of Utah Computer
9 * Science Department. CSS requests users of this software to return
10 * to css-dist@cs.utah.edu any improvements that they make and grant
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23 * This product includes software developed by the University of
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41 * from: @(#)bpf.c 8.1 (Berkeley) 6/4/93
43 * From: Utah Hdr: bpf.c 3.1 92/07/06
44 * Author: Jeff Forys, University of Utah CSS
49 static const char sccsid[] = "@(#)bpf.c 8.1 (Berkeley) 6/4/93";
51 static const char rcsid[] =
55 #include <sys/param.h>
56 #include <sys/ioctl.h>
57 #include <sys/socket.h>
72 #include "pathnames.h"
74 static int BpfFd = -1;
75 static unsigned BpfLen = 0;
76 static u_int8_t *BpfPkt = NULL;
79 ** BpfOpen -- Open and initialize a BPF device.
85 ** File descriptor of opened BPF device (for select() etc).
88 ** If an error is encountered, the program terminates here.
98 * Open the first available BPF device.
101 (void) sprintf(bpfdev, _PATH_BPF, n++);
102 BpfFd = open(bpfdev, O_RDWR);
103 } while (BpfFd < 0 && (errno == EBUSY || errno == EPERM));
106 syslog(LOG_ERR, "bpf: no available devices: %m");
111 * Set interface name for bpf device, get data link layer
112 * type and make sure it's type Ethernet.
114 (void) strncpy(ifr.ifr_name, IntfName, sizeof(ifr.ifr_name));
115 if (ioctl(BpfFd, BIOCSETIF, (caddr_t)&ifr) < 0) {
116 syslog(LOG_ERR, "bpf: ioctl(BIOCSETIF,%s): %m", IntfName);
121 * Make sure we are dealing with an Ethernet device.
123 if (ioctl(BpfFd, BIOCGDLT, (caddr_t)&n) < 0) {
124 syslog(LOG_ERR, "bpf: ioctl(BIOCGDLT): %m");
127 if (n != DLT_EN10MB) {
128 syslog(LOG_ERR,"bpf: %s: data-link type %d unsupported",
134 * On read(), return packets immediately (do not buffer them).
137 if (ioctl(BpfFd, BIOCIMMEDIATE, (caddr_t)&n) < 0) {
138 syslog(LOG_ERR, "bpf: ioctl(BIOCIMMEDIATE): %m");
143 * Try to enable the chip/driver's multicast address filter to
144 * grab our RMP address. If this fails, try promiscuous mode.
145 * If this fails, there's no way we are going to get any RMP
146 * packets so just exit here.
149 ifr.ifr_addr.sa_len = RMP_ADDRLEN + 2;
151 ifr.ifr_addr.sa_family = AF_UNSPEC;
152 memmove((char *)&ifr.ifr_addr.sa_data[0], &RmpMcastAddr[0], RMP_ADDRLEN);
153 if (ioctl(BpfFd, BIOCPROMISC, (caddr_t)0) < 0) {
154 syslog(LOG_ERR, "bpf: can't set promiscuous mode: %m");
159 * Ask BPF how much buffer space it requires and allocate one.
161 if (ioctl(BpfFd, BIOCGBLEN, (caddr_t)&BpfLen) < 0) {
162 syslog(LOG_ERR, "bpf: ioctl(BIOCGBLEN): %m");
166 BpfPkt = (u_int8_t *)malloc(BpfLen);
168 if (BpfPkt == NULL) {
169 syslog(LOG_ERR, "bpf: out of memory (%u bytes for bpfpkt)",
175 * Write a little program to snarf RMP Boot packets and stuff
176 * it down BPF's throat (i.e. set up the packet filter).
179 #define RMP ((struct rmp_packet *)0)
180 static struct bpf_insn bpf_insn[] = {
181 { BPF_LD|BPF_B|BPF_ABS, 0, 0, (long)&RMP->hp_llc.dsap },
182 { BPF_JMP|BPF_JEQ|BPF_K, 0, 5, IEEE_DSAP_HP },
183 { BPF_LD|BPF_H|BPF_ABS, 0, 0, (long)&RMP->hp_llc.cntrl },
184 { BPF_JMP|BPF_JEQ|BPF_K, 0, 3, IEEE_CNTL_HP },
185 { BPF_LD|BPF_H|BPF_ABS, 0, 0, (long)&RMP->hp_llc.dxsap },
186 { BPF_JMP|BPF_JEQ|BPF_K, 0, 1, HPEXT_DXSAP },
187 { BPF_RET|BPF_K, 0, 0, RMP_MAX_PACKET },
188 { BPF_RET|BPF_K, 0, 0, 0x0 }
191 static struct bpf_program bpf_pgm = {
192 sizeof(bpf_insn)/sizeof(bpf_insn[0]), bpf_insn
195 if (ioctl(BpfFd, BIOCSETF, (caddr_t)&bpf_pgm) < 0) {
196 syslog(LOG_ERR, "bpf: ioctl(BIOCSETF): %m");
205 ** BPF GetIntfName -- Return the name of a network interface attached to
206 ** the system, or 0 if none can be found. The interface
207 ** must be configured up; the lowest unit number is
208 ** preferred; loopback is ignored.
211 ** errmsg - if no network interface found, *errmsg explains why.
214 ** A (static) pointer to interface name, or NULL on error.
220 BpfGetIntfName(char **errmsg)
222 struct ifreq ibuf[8], *ifrp, *ifend, *mp;
227 static char device[sizeof(ifrp->ifr_name)];
228 static char errbuf[128] = "No Error!";
233 if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
234 (void) strcpy(errbuf, "bpf: socket: %m");
237 ifc.ifc_len = sizeof ibuf;
238 ifc.ifc_buf = (caddr_t)ibuf;
241 if (ioctl(fd, OSIOCGIFCONF, (char *)&ifc) < 0 ||
242 ifc.ifc_len < sizeof(struct ifreq)) {
243 (void) strcpy(errbuf, "bpf: ioctl(OSIOCGIFCONF): %m");
247 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
248 ifc.ifc_len < sizeof(struct ifreq)) {
249 (void) strcpy(errbuf, "bpf: ioctl(SIOCGIFCONF): %m");
254 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
258 for (; ifrp < ifend; ++ifrp) {
259 if (ioctl(fd, SIOCGIFFLAGS, (char *)ifrp) < 0) {
260 (void) strcpy(errbuf, "bpf: ioctl(SIOCGIFFLAGS): %m");
265 * If interface is down or this is the loopback interface,
268 if ((ifrp->ifr_flags & IFF_UP) == 0 ||
270 (ifrp->ifr_flags & IFF_LOOPBACK))
272 (strcmp(ifrp->ifr_name, "lo0") == 0))
276 for (cp = ifrp->ifr_name; !isdigit(*cp); ++cp)
287 (void) strcpy(errbuf, "bpf: no interfaces found");
291 (void) strcpy(device, mp->ifr_name);
296 ** BpfRead -- Read packets from a BPF device and fill in `rconn'.
299 ** rconn - filled in with next packet.
300 ** doread - is True if we can issue a read() syscall.
303 ** True if `rconn' contains a new packet, False otherwise.
309 BpfRead(RMPCONN *rconn, int doread)
311 int datlen, caplen, hdrlen;
312 static u_int8_t *bp = NULL, *ep = NULL;
316 * The read() may block, or it may return one or more packets.
317 * We let the caller decide whether or not we can issue a read().
320 if ((cc = read(BpfFd, (char *)BpfPkt, (int)BpfLen)) < 0) {
321 syslog(LOG_ERR, "bpf: read: %m");
329 #define bhp ((struct bpf_hdr *)bp)
331 * If there is a new packet in the buffer, stuff it into `rconn'
332 * and return a success indication.
335 datlen = bhp->bh_datalen;
336 caplen = bhp->bh_caplen;
337 hdrlen = bhp->bh_hdrlen;
339 if (caplen != datlen)
341 "bpf: short packet dropped (%d of %d bytes)",
343 else if (caplen > sizeof(struct rmp_packet))
344 syslog(LOG_ERR, "bpf: large packet dropped (%d bytes)",
347 rconn->rmplen = caplen;
348 memmove((char *)&rconn->tstamp, (char *)&bhp->bh_tstamp,
349 sizeof(struct timeval));
350 memmove((char *)&rconn->rmp, (char *)bp + hdrlen, caplen);
352 bp += BPF_WORDALIGN(caplen + hdrlen);
361 ** BpfWrite -- Write packet to BPF device.
364 ** rconn - packet to send.
367 ** True if write succeeded, False otherwise.
373 BpfWrite(RMPCONN *rconn)
375 if (write(BpfFd, (char *)&rconn->rmp, rconn->rmplen) < 0) {
376 syslog(LOG_ERR, "write: %s: %m", EnetStr(rconn));
384 ** BpfClose -- Close a BPF device.
400 if (BpfPkt != NULL) {
401 free((char *)BpfPkt);
409 ifr.ifr_addr.sa_len = RMP_ADDRLEN + 2;
411 ifr.ifr_addr.sa_family = AF_UNSPEC;
412 memmove((char *)&ifr.ifr_addr.sa_data[0], &RmpMcastAddr[0], RMP_ADDRLEN);
413 if (ioctl(BpfFd, SIOCDELMULTI, (caddr_t)&ifr) < 0)
414 (void) ioctl(BpfFd, BIOCPROMISC, (caddr_t)0);