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_snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
134 pcap_strerror(errno));
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_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
227 pcap_strerror(errno));
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_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "NIOCSCHUNK: %s",
251 pcap_strerror(errno));
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_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "NIOCSTIME: %s",
264 pcap_strerror(errno));
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_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "NIOCSFLAGS: %s",
276 pcap_strerror(errno));
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";
293 * No monitor mode on SunOS 4.x (no Wi-Fi devices on
294 * hardware supported by SunOS 4.x).
296 return (PCAP_ERROR_RFMON_NOTSUP);
299 if (p->snapshot < 96)
301 * NIT requires a snapshot length of at least 96.
306 * Initially try a read/write open (to allow the inject
307 * method to work). If that fails due to permission
308 * issues, fall back to read-only. This allows a
309 * non-root user to be granted specific access to pcap
310 * capabilities via file permissions.
312 * XXX - we should have an API that has a flag that
313 * controls whether to open read-only or read-write,
314 * so that denial of permission to send (or inability
315 * to send, if sending packets isn't supported on
316 * the device in question) can be indicated at open
319 p->fd = fd = open(dev, O_RDWR);
320 if (fd < 0 && errno == EACCES)
321 p->fd = fd = open(dev, O_RDONLY);
323 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s", dev,
324 pcap_strerror(errno));
328 /* arrange to get discrete messages from the STREAM and use NIT_BUF */
329 if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) {
330 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "I_SRDOPT: %s",
331 pcap_strerror(errno));
334 if (ioctl(fd, I_PUSH, "nbuf") < 0) {
335 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "push nbuf: %s",
336 pcap_strerror(errno));
339 /* set the chunksize */
340 si.ic_cmd = NIOCSCHUNK;
341 si.ic_timout = INFTIM;
342 si.ic_len = sizeof(chunksize);
343 si.ic_dp = (char *)&chunksize;
344 if (ioctl(fd, I_STR, (char *)&si) < 0) {
345 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "NIOCSCHUNK: %s",
346 pcap_strerror(errno));
350 /* request the interface */
351 strncpy(ifr.ifr_name, p->opt.device, sizeof(ifr.ifr_name));
352 ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
353 si.ic_cmd = NIOCBIND;
354 si.ic_len = sizeof(ifr);
355 si.ic_dp = (char *)𝔦
356 if (ioctl(fd, I_STR, (char *)&si) < 0) {
358 * XXX - is there an error that means "no such device"?
359 * Is there one that means "that device doesn't support
362 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "NIOCBIND: %s: %s",
363 ifr.ifr_name, pcap_strerror(errno));
367 /* set the snapshot length */
368 si.ic_cmd = NIOCSSNAP;
369 si.ic_len = sizeof(p->snapshot);
370 si.ic_dp = (char *)&p->snapshot;
371 if (ioctl(fd, I_STR, (char *)&si) < 0) {
372 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "NIOCSSNAP: %s",
373 pcap_strerror(errno));
376 if (nit_setflags(p) < 0)
379 (void)ioctl(fd, I_FLUSH, (char *)FLUSHR);
381 * NIT supports only ethernets.
383 p->linktype = DLT_EN10MB;
385 p->bufsize = BUFSPACE;
386 p->buffer = malloc(p->bufsize);
387 if (p->buffer == NULL) {
388 strlcpy(p->errbuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
393 * "p->fd" is an FD for a STREAMS device, so "select()" and
394 * "poll()" should work on it.
396 p->selectable_fd = p->fd;
399 * This is (presumably) a real Ethernet capture; give it a
400 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
401 * that an application can let you choose it, in case you're
402 * capturing DOCSIS traffic that a Cisco Cable Modem
403 * Termination System is putting out onto an Ethernet (it
404 * doesn't put an Ethernet header onto the wire, it puts raw
405 * DOCSIS frames out on the wire inside the low-level
408 p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
410 * If that fails, just leave the list empty.
412 if (p->dlt_list != NULL) {
413 p->dlt_list[0] = DLT_EN10MB;
414 p->dlt_list[1] = DLT_DOCSIS;
418 p->read_op = pcap_read_snit;
419 p->inject_op = pcap_inject_snit;
420 p->setfilter_op = install_bpf_program; /* no kernel filtering */
421 p->setdirection_op = NULL; /* Not implemented. */
422 p->set_datalink_op = NULL; /* can't change data link type */
423 p->getnonblock_op = pcap_getnonblock_fd;
424 p->setnonblock_op = pcap_setnonblock_fd;
425 p->stats_op = pcap_stats_snit;
429 pcap_cleanup_live_common(p);
434 pcap_create_interface(const char *device _U_, char *ebuf)
438 p = pcap_create_common(ebuf, sizeof (struct pcap_snit));
442 p->activate_op = pcap_activate_snit;
447 * XXX - there's probably a NIOCBIND error that means "that device
448 * doesn't support NIT"; if so, we should try an NIOCBIND and use that.
451 can_be_bound(const char *name _U_)
457 pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
459 return (pcap_findalldevs_interfaces(alldevsp, errbuf, can_be_bound));