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14 * must display the following acknowledgement:
15 * This product includes software developed by the Computer Systems
16 * Engineering Group at Lawrence Berkeley Laboratory.
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21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#) $Header: /tcpdump/master/libpcap/pcap-int.h,v 1.68.2.11 2007/06/22 06:43:58 guy Exp $ (LBL)
56 * Swap byte ordering of unsigned long long timestamp on a big endian
59 #define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \
60 ((ull & 0x00ff000000000000LL) >> 40) | \
61 ((ull & 0x0000ff0000000000LL) >> 24) | \
62 ((ull & 0x000000ff00000000LL) >> 8) | \
63 ((ull & 0x00000000ff000000LL) << 8) | \
64 ((ull & 0x0000000000ff0000LL) << 24) | \
65 ((ull & 0x000000000000ff00LL) << 40) | \
66 ((ull & 0x00000000000000ffLL) << 56)
81 swapped_type_t lengths_swapped;
88 struct pcap_stat stat;
90 int use_bpf; /* using kernel filter */
91 u_long TotPkts; /* can't oflow for 79 hrs on ether */
92 u_long TotAccepted; /* count accepted by filter */
93 u_long TotDrops; /* count of dropped packets */
94 long TotMissed; /* missed by i/f during this run */
95 long OrigMissed; /* missed by i/f before this run */
96 char *device; /* device name */
98 int sock_packet; /* using Linux 2.0 compatible interface */
99 int timeout; /* timeout specified to pcap_open_live */
100 int clear_promisc; /* must clear promiscuous mode when we close */
101 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */
102 int ifindex; /* interface index of device we're bound to */
103 int lo_ifindex; /* interface index of the loopback device */
104 struct pcap *next; /* list of open promiscuous sock_packet pcaps */
105 u_int packets_read; /* count of packets read with recvfrom() */
109 #ifdef HAVE_DAG_STREAMS_API
110 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */
111 u_char *dag_mem_top; /* DAG card current memory top pointer */
113 void *dag_mem_base; /* DAG card memory base address */
114 u_int dag_mem_bottom; /* DAG card current memory bottom offset */
115 u_int dag_mem_top; /* DAG card current memory top offset */
116 #endif /* HAVE_DAG_STREAMS_API */
117 int dag_fcs_bits; /* Number of checksum bits from link layer */
118 int dag_offset_flags; /* Flags to pass to dag_offset(). */
119 int dag_stream; /* DAG stream number */
120 int dag_timeout; /* timeout specified to pcap_open_live.
121 * Same as in linux above, introduce
123 #endif /* HAVE_DAG_API */
127 * Ultrix, DEC OSF/1^H^H^H^H^H^H^H^H^HDigital UNIX^H^H^H^H^H^H^H^H^H^H^H^H
128 * Tru64 UNIX, and some versions of NetBSD pad FDDI packets to make everything
129 * line up on a nice boundary.
132 #include <sys/param.h> /* needed to declare __NetBSD_Version__ */
135 #if defined(ultrix) || defined(__osf__) || (defined(__NetBSD__) && __NetBSD_Version__ > 106000000)
136 #define PCAP_FDDIPAD 3
152 int tzoff; /* timezone offset */
153 int offset; /* offset for proper alignment */
155 int break_loop; /* flag set to force break from packet-reading loop */
162 int inter_packet_wait; /* offline: wait between packets */
163 void (*wait_proc)(void); /* call proc while waiting */
170 * Read buffer -- for file descriptor read buffer model.
179 * Zero-copy read buffer -- for zero-copy BPF. 'buffer' above will
180 * alternative between these two actual mmap'd buffers as required.
181 * As there is a header on the front size of the mmap'd buffer, only
182 * some of the buffer is exposed to libpcap as a whole via bufsize;
183 * zbufsize is the true size. zbuffer tracks the current zbuf
184 * assocated with buffer so that it can be used to decide which the
185 * next buffer to read will be.
187 u_char *zbuf1, *zbuf2, *zbuffer;
192 struct timespec firstsel;
195 * If there's currently a buffer being actively processed, then it is
196 * referenced here; 'buffer' is also pointed at it, but offset by the
197 * size of the header.
199 struct bpf_zbuf_header *bzh;
202 * Place holder for pcap_next().
206 /* We're accepting only packets in this direction/these directions. */
207 pcap_direction_t direction;
212 int (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
213 int (*inject_op)(pcap_t *, const void *, size_t);
214 int (*setfilter_op)(pcap_t *, struct bpf_program *);
215 int (*setdirection_op)(pcap_t *, pcap_direction_t);
216 int (*set_datalink_op)(pcap_t *, int);
217 int (*getnonblock_op)(pcap_t *, char *);
218 int (*setnonblock_op)(pcap_t *, int, char *);
219 int (*stats_op)(pcap_t *, struct pcap_stat *);
220 void (*close_op)(pcap_t *);
223 * Placeholder for filter code if bpf not in kernel.
225 struct bpf_program fcode;
227 char errbuf[PCAP_ERRBUF_SIZE + 1];
231 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
235 * This is a timeval as stored in a savefile.
236 * It has to use the same types everywhere, independent of the actual
237 * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
238 * platforms and 64-bit tv_sec values on other platforms, and writing
239 * out native `struct timeval' values would mean files could only be
240 * read on systems with the same tv_sec size as the system on which
241 * the file was written.
244 struct pcap_timeval {
245 bpf_int32 tv_sec; /* seconds */
246 bpf_int32 tv_usec; /* microseconds */
250 * This is a `pcap_pkthdr' as actually stored in a savefile.
252 * Do not change the format of this structure, in any way (this includes
253 * changes that only affect the length of fields in this structure),
254 * and do not make the time stamp anything other than seconds and
255 * microseconds (e.g., seconds and nanoseconds). Instead:
257 * introduce a new structure for the new format;
259 * send mail to "tcpdump-workers@tcpdump.org", requesting a new
260 * magic number for your new capture file format, and, when
261 * you get the new magic number, put it in "savefile.c";
263 * use that magic number for save files with the changed record
266 * make the code in "savefile.c" capable of reading files with
267 * the old record header as well as files with the new record header
268 * (using the magic number to determine the header format).
270 * Then supply the changes to "patches@tcpdump.org", so that future
271 * versions of libpcap and programs that use it (such as tcpdump) will
272 * be able to read your new capture file format.
275 struct pcap_sf_pkthdr {
276 struct pcap_timeval ts; /* time stamp */
277 bpf_u_int32 caplen; /* length of portion present */
278 bpf_u_int32 len; /* length this packet (off wire) */
282 * How a `pcap_pkthdr' is actually stored in savefiles written
283 * by some patched versions of libpcap (e.g. the ones in Red
284 * Hat Linux 6.1 and 6.2).
286 * Do not change the format of this structure, in any way (this includes
287 * changes that only affect the length of fields in this structure).
288 * Instead, introduce a new structure, as per the above.
291 struct pcap_sf_patched_pkthdr {
292 struct pcap_timeval ts; /* time stamp */
293 bpf_u_int32 caplen; /* length of portion present */
294 bpf_u_int32 len; /* length this packet (off wire) */
296 unsigned short protocol;
297 unsigned char pkt_type;
303 #define min(a, b) ((a) > (b) ? (b) : (a))
306 /* XXX should these be in pcap.h? */
307 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
308 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
311 #define strlcpy(x, y, z) \
312 (strncpy((x), (y), (z)), \
313 ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
320 * Routines that most pcap implementations can use for non-blocking mode.
322 #if !defined(WIN32) && !defined(MSDOS)
323 int pcap_getnonblock_fd(pcap_t *, char *);
324 int pcap_setnonblock_fd(pcap_t *p, int, char *);
327 void pcap_close_common(pcap_t *);
330 * Internal interfaces for "pcap_findalldevs()".
332 * "pcap_platform_finddevs()" is a platform-dependent routine to
333 * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
334 * "getifaddrs()", etc..
336 * "pcap_add_if()" adds an interface to the list of interfaces.
338 int pcap_platform_finddevs(pcap_if_t **, char *);
339 int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
340 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
341 struct sockaddr *, size_t, char *);
342 int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
343 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
344 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
345 const char *, char *);
348 char *pcap_win32strerror(void);
351 int install_bpf_program(pcap_t *, struct bpf_program *);
353 int pcap_strcasecmp(const char *, const char *);