2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 * Modifications made to accommodate the new SunOS4.0 NIT facility by
22 * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989.
23 * This module now handles the STREAMS based NIT.
30 #include <sys/types.h>
32 #include <sys/timeb.h>
34 #include <sys/fcntlcom.h>
36 #include <sys/ioctl.h>
37 #include <sys/socket.h>
38 #include <sys/stropts.h>
42 #include <net/nit_if.h>
43 #include <net/nit_pf.h>
44 #include <net/nit_buf.h>
46 #include <netinet/in.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/ip.h>
49 #include <netinet/if_ether.h>
50 #include <netinet/ip_var.h>
51 #include <netinet/udp.h>
52 #include <netinet/udp_var.h>
53 #include <netinet/tcp.h>
54 #include <netinet/tcpip.h>
64 #ifdef HAVE_OS_PROTO_H
69 * The chunk size for NIT. This is the amount of buffering
70 * done for read calls.
72 #define CHUNKSIZE (2*1024)
75 * The total buffer space used by NIT.
77 #define BUFSPACE (4*CHUNKSIZE)
80 static int nit_setflags(int, int, int, char *);
83 * Private data for capturing on STREAMS NIT devices.
86 struct pcap_stat stat;
90 pcap_stats_snit(pcap_t *p, struct pcap_stat *ps)
92 struct pcap_snit *psn = p->priv;
95 * "ps_recv" counts packets handed to the filter, not packets
96 * that passed the filter. As filtering is done in userland,
97 * this does not include packets dropped because we ran out
100 * "ps_drop" counts packets dropped inside the "/dev/nit"
101 * device because of flow control requirements or resource
102 * exhaustion; it doesn't count packets dropped by the
103 * interface driver, or packets dropped upstream. As filtering
104 * is done in userland, it counts packets regardless of whether
105 * they would've passed the filter.
107 * These statistics don't include packets not yet read from the
108 * kernel by libpcap or packets not yet read from libpcap by the
116 pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
118 struct pcap_snit *psn = p->priv;
120 register u_char *bp, *cp, *ep;
121 register struct nit_bufhdr *hdrp;
122 register struct nit_iftime *ntp;
123 register struct nit_iflen *nlp;
124 register struct nit_ifdrops *ndp;
129 cc = read(p->fd, (char *)p->buffer, p->bufsize);
131 if (errno == EWOULDBLOCK)
133 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
137 bp = (u_char *)p->buffer;
142 * loop through each snapshot in the chunk
148 * Has "pcap_breakloop()" been called?
149 * If so, return immediately - if we haven't read any
150 * packets, clear the flag and return -2 to indicate
151 * that we were told to break out of the loop, otherwise
152 * leave the flag set, so that the *next* call will break
153 * out of the loop without having read any packets, and
154 * return the number of packets we've processed so far.
170 /* get past NIT buffer */
171 hdrp = (struct nit_bufhdr *)cp;
174 /* get past NIT timer */
175 ntp = (struct nit_iftime *)cp;
178 ndp = (struct nit_ifdrops *)cp;
179 psn->stat.ps_drop = ndp->nh_drops;
182 /* get past packet len */
183 nlp = (struct nit_iflen *)cp;
187 bp += hdrp->nhb_totlen;
189 caplen = nlp->nh_pktlen;
190 if (caplen > p->snapshot)
191 caplen = p->snapshot;
193 if (bpf_filter(p->fcode.bf_insns, cp, nlp->nh_pktlen, caplen)) {
194 struct pcap_pkthdr h;
195 h.ts = ntp->nh_timestamp;
196 h.len = nlp->nh_pktlen;
198 (*callback)(user, &h, cp);
199 if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
211 pcap_inject_snit(pcap_t *p, const void *buf, size_t size)
213 struct strbuf ctl, data;
216 * XXX - can we just do
218 ret = write(pd->f, buf, size);
220 ctl.len = sizeof(*sa); /* XXX - what was this? */
221 ctl.buf = (char *)sa;
224 ret = putmsg(p->fd, &ctl, &data);
226 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
234 nit_setflags(pcap_t *p)
239 struct timeval timeout;
241 if (p->opt.immediate) {
243 * Set the chunk size to zero, so that chunks get sent
246 si.ic_cmd = NIOCSCHUNK;
247 si.ic_len = sizeof(zero);
248 si.ic_dp = (char *)&zero;
249 if (ioctl(p->fd, I_STR, (char *)&si) < 0) {
250 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
251 errno, "NIOCSCHUNK");
255 si.ic_timout = INFTIM;
256 if (p->opt.timeout != 0) {
257 timeout.tv_sec = p->opt.timeout / 1000;
258 timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
259 si.ic_cmd = NIOCSTIME;
260 si.ic_len = sizeof(timeout);
261 si.ic_dp = (char *)&timeout;
262 if (ioctl(p->fd, I_STR, (char *)&si) < 0) {
263 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
268 flags = NI_TIMESTAMP | NI_LEN | NI_DROPS;
271 si.ic_cmd = NIOCSFLAGS;
272 si.ic_len = sizeof(flags);
273 si.ic_dp = (char *)&flags;
274 if (ioctl(p->fd, I_STR, (char *)&si) < 0) {
275 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
276 errno, "NIOCSFLAGS");
283 pcap_activate_snit(pcap_t *p)
285 struct strioctl si; /* struct for ioctl() */
286 struct ifreq ifr; /* interface request struct */
287 int chunksize = CHUNKSIZE;
289 static const char dev[] = "/dev/nit";
294 * No monitor mode on SunOS 4.x (no Wi-Fi devices on
295 * hardware supported by SunOS 4.x).
297 return (PCAP_ERROR_RFMON_NOTSUP);
301 * Turn a negative snapshot value (invalid), a snapshot value of
302 * 0 (unspecified), or a value bigger than the normal maximum
303 * value, into the maximum allowed value.
305 * If some application really *needs* a bigger snapshot
306 * length, we should just increase MAXIMUM_SNAPLEN.
308 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
309 p->snapshot = MAXIMUM_SNAPLEN;
311 if (p->snapshot < 96)
313 * NIT requires a snapshot length of at least 96.
318 * Initially try a read/write open (to allow the inject
319 * method to work). If that fails due to permission
320 * issues, fall back to read-only. This allows a
321 * non-root user to be granted specific access to pcap
322 * capabilities via file permissions.
324 * XXX - we should have an API that has a flag that
325 * controls whether to open read-only or read-write,
326 * so that denial of permission to send (or inability
327 * to send, if sending packets isn't supported on
328 * the device in question) can be indicated at open
331 p->fd = fd = open(dev, O_RDWR);
332 if (fd < 0 && errno == EACCES)
333 p->fd = fd = open(dev, O_RDONLY);
336 err = PCAP_ERROR_PERM_DENIED;
339 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
344 /* arrange to get discrete messages from the STREAM and use NIT_BUF */
345 if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) {
346 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
351 if (ioctl(fd, I_PUSH, "nbuf") < 0) {
352 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
357 /* set the chunksize */
358 si.ic_cmd = NIOCSCHUNK;
359 si.ic_timout = INFTIM;
360 si.ic_len = sizeof(chunksize);
361 si.ic_dp = (char *)&chunksize;
362 if (ioctl(fd, I_STR, (char *)&si) < 0) {
363 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
364 errno, "NIOCSCHUNK");
369 /* request the interface */
370 strncpy(ifr.ifr_name, p->opt.device, sizeof(ifr.ifr_name));
371 ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
372 si.ic_cmd = NIOCBIND;
373 si.ic_len = sizeof(ifr);
374 si.ic_dp = (char *)𝔦
375 if (ioctl(fd, I_STR, (char *)&si) < 0) {
377 * XXX - is there an error that means "no such device"?
378 * Is there one that means "that device doesn't support
381 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
382 errno, "NIOCBIND: %s", ifr.ifr_name);
387 /* set the snapshot length */
388 si.ic_cmd = NIOCSSNAP;
389 si.ic_len = sizeof(p->snapshot);
390 si.ic_dp = (char *)&p->snapshot;
391 if (ioctl(fd, I_STR, (char *)&si) < 0) {
392 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
397 if (nit_setflags(p) < 0) {
402 (void)ioctl(fd, I_FLUSH, (char *)FLUSHR);
404 * NIT supports only ethernets.
406 p->linktype = DLT_EN10MB;
408 p->bufsize = BUFSPACE;
409 p->buffer = malloc(p->bufsize);
410 if (p->buffer == NULL) {
411 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
418 * "p->fd" is an FD for a STREAMS device, so "select()" and
419 * "poll()" should work on it.
421 p->selectable_fd = p->fd;
424 * This is (presumably) a real Ethernet capture; give it a
425 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
426 * that an application can let you choose it, in case you're
427 * capturing DOCSIS traffic that a Cisco Cable Modem
428 * Termination System is putting out onto an Ethernet (it
429 * doesn't put an Ethernet header onto the wire, it puts raw
430 * DOCSIS frames out on the wire inside the low-level
433 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
435 * If that fails, just leave the list empty.
437 if (p->dlt_list != NULL) {
438 p->dlt_list[0] = DLT_EN10MB;
439 p->dlt_list[1] = DLT_DOCSIS;
443 p->read_op = pcap_read_snit;
444 p->inject_op = pcap_inject_snit;
445 p->setfilter_op = install_bpf_program; /* no kernel filtering */
446 p->setdirection_op = NULL; /* Not implemented. */
447 p->set_datalink_op = NULL; /* can't change data link type */
448 p->getnonblock_op = pcap_getnonblock_fd;
449 p->setnonblock_op = pcap_setnonblock_fd;
450 p->stats_op = pcap_stats_snit;
454 pcap_cleanup_live_common(p);
459 pcap_create_interface(const char *device _U_, char *ebuf)
463 p = pcap_create_common(ebuf, sizeof (struct pcap_snit));
467 p->activate_op = pcap_activate_snit;
472 * XXX - there's probably a NIOCBIND error that means "that device
473 * doesn't support NIT"; if so, we should try an NIOCBIND and use that.
476 can_be_bound(const char *name _U_)
482 get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)
486 * XXX - is there a way to find out whether an adapter has
487 * something plugged into it?
493 pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
495 return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound,
500 * Libpcap version string.
503 pcap_lib_version(void)
505 return (PCAP_VERSION_STRING);