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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 1.55.2.4 2003/12/15 01:42:24 guy Exp $ (LBL)
63 swapped_type_t lengths_swapped;
70 struct pcap_stat stat;
72 int use_bpf; /* using kernel filter */
73 u_long TotPkts; /* can't oflow for 79 hrs on ether */
74 u_long TotAccepted; /* count accepted by filter */
75 u_long TotDrops; /* count of dropped packets */
76 long TotMissed; /* missed by i/f during this run */
77 long OrigMissed; /* missed by i/f before this run */
79 int sock_packet; /* using Linux 2.0 compatible interface */
80 int timeout; /* timeout specified to pcap_open_live */
81 int clear_promisc; /* must clear promiscuous mode when we close */
82 int cooked; /* using SOCK_DGRAM rather than SOCK_RAW */
83 int lo_ifindex; /* interface index of the loopback device */
84 char *device; /* device name */
85 struct pcap *next; /* list of open promiscuous sock_packet pcaps */
89 void *dag_mem_base; /* DAG card memory base address */
90 u_int dag_mem_bottom; /* DAG card current memory bottom pointer */
91 u_int dag_mem_top; /* DAG card current memory top pointer */
92 int dag_fcs_bits; /* Number of checksum bits from link layer */
93 int dag_offset_flags; /* Flags to pass to dag_offset(). */
109 int tzoff; /* timezone offset */
110 int offset; /* offset for proper alignment */
112 int break_loop; /* flag set to force break from packet-reading loop */
126 * Place holder for pcap_next().
133 int (*read_op)(pcap_t *, int cnt, pcap_handler, u_char *);
134 int (*setfilter_op)(pcap_t *, struct bpf_program *);
135 int (*set_datalink_op)(pcap_t *, int);
136 int (*getnonblock_op)(pcap_t *, char *);
137 int (*setnonblock_op)(pcap_t *, int, char *);
138 int (*stats_op)(pcap_t *, struct pcap_stat *);
139 void (*close_op)(pcap_t *);
142 * Placeholder for filter code if bpf not in kernel.
144 struct bpf_program fcode;
146 char errbuf[PCAP_ERRBUF_SIZE + 1];
150 struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
154 * This is a timeval as stored in disk in a dumpfile.
155 * It has to use the same types everywhere, independent of the actual
159 struct pcap_timeval {
160 bpf_int32 tv_sec; /* seconds */
161 bpf_int32 tv_usec; /* microseconds */
165 * How a `pcap_pkthdr' is actually stored in the dumpfile.
167 * Do not change the format of this structure, in any way (this includes
168 * changes that only affect the length of fields in this structure),
169 * and do not make the time stamp anything other than seconds and
170 * microseconds (e.g., seconds and nanoseconds). Instead:
172 * introduce a new structure for the new format;
174 * send mail to "tcpdump-workers@tcpdump.org", requesting a new
175 * magic number for your new capture file format, and, when
176 * you get the new magic number, put it in "savefile.c";
178 * use that magic number for save files with the changed record
181 * make the code in "savefile.c" capable of reading files with
182 * the old record header as well as files with the new record header
183 * (using the magic number to determine the header format).
185 * Then supply the changes to "patches@tcpdump.org", so that future
186 * versions of libpcap and programs that use it (such as tcpdump) will
187 * be able to read your new capture file format.
190 struct pcap_sf_pkthdr {
191 struct pcap_timeval ts; /* time stamp */
192 bpf_u_int32 caplen; /* length of portion present */
193 bpf_u_int32 len; /* length this packet (off wire) */
197 * How a `pcap_pkthdr' is actually stored in dumpfiles written
198 * by some patched versions of libpcap (e.g. the ones in Red
199 * Hat Linux 6.1 and 6.2).
201 * Do not change the format of this structure, in any way (this includes
202 * changes that only affect the length of fields in this structure).
203 * Instead, introduce a new structure, as per the above.
206 struct pcap_sf_patched_pkthdr {
207 struct pcap_timeval ts; /* time stamp */
208 bpf_u_int32 caplen; /* length of portion present */
209 bpf_u_int32 len; /* length this packet (off wire) */
211 unsigned short protocol;
212 unsigned char pkt_type;
218 #define min(a, b) ((a) > (b) ? (b) : (a))
221 /* XXX should these be in pcap.h? */
222 int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
223 int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
227 * 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
228 * Tru64 UNIX, and NetBSD pad to make everything line up on a nice boundary.
230 #if defined(ultrix) || defined(__osf__) || defined(__NetBSD__)
231 #define PCAP_FDDIPAD 3
237 * Routines that most pcap implementations can use for non-blocking mode.
240 int pcap_getnonblock_fd(pcap_t *, char *);
241 int pcap_setnonblock_fd(pcap_t *p, int, char *);
245 * Internal interfaces for "pcap_findalldevs()".
247 * "pcap_platform_finddevs()" is a platform-dependent routine to
248 * add devices not found by the "standard" mechanisms (SIOCGIFCONF,
249 * "getifaddrs()", etc..
251 * "pcap_add_if()" adds an interface to the list of interfaces.
253 int pcap_platform_finddevs(pcap_if_t **, char *);
254 int add_addr_to_iflist(pcap_if_t **, char *, u_int, struct sockaddr *,
255 size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
256 struct sockaddr *, size_t, char *);
257 int pcap_add_if(pcap_if_t **, char *, u_int, const char *, char *);
258 struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
259 int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
260 const char *, char *);
263 char *pcap_win32strerror(void);
267 extern int pcap_fddipad;
269 int install_bpf_program(pcap_t *, struct bpf_program *);
271 int pcap_strcasecmp(const char *, const char *);