Update config.{guess,sub}, timestamps 2023-01-01,2023-01-21

[libpcap] / pcap / bpf.h

diff --git a/pcap/bpf.h b/pcap/bpf.h
index 927258847d8fa69d05f91bfeec2a44a3aae51ddd..3970d0a18426321a2ad1d8278488521df2dc18bb 100644 (file)
--- a/pcap/bpf.h
+++ b/pcap/bpf.h
@@ -15,11 +15,7 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by the University of
- *      California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
+ * 3. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -62,16 +58,30 @@
  * I don't have earlier versions available to check), or QNX-style
  * multiple-include protection (as per GitHub pull request #394).
  *
+ * We trust that they will define structures and macros and types in
+ * a fashion that's source-compatible and binary-compatible with our
+ * definitions.
+ *
  * We do not check for BPF_MAJOR_VERSION, as that's defined by
  * <linux/filter.h>, which is directly or indirectly included in some
  * programs that also include pcap.h, and <linux/filter.h> doesn't
- * define stuff we need.
+ * define stuff we need.  We *do* protect against <linux/filter.h>
+ * defining various macros for BPF code itself; <linux/filter.h> says
+ *
+ *     Try and keep these values and structures similar to BSD, especially
+ *     the BPF code definitions which need to match so you can share filters
+ *
+ * so we trust that it will define them in a fashion that's source-compatible
+ * and binary-compatible with our definitions.
  *
  * This also provides our own multiple-include protection.
  */
 #if !defined(_NET_BPF_H_) && !defined(_NET_BPF_H_INCLUDED) && !defined(_BPF_H_) && !defined(_H_BPF) && !defined(lib_pcap_bpf_h)
 #define lib_pcap_bpf_h
 
+#include <pcap/funcattrs.h>
+#include <pcap/dlt.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -108,8 +118,6 @@ struct bpf_program {
        struct bpf_insn *bf_insns;
 };
 
-#include <pcap/dlt.h>
-
 /*
  * The instruction encodings.
  *
@@ -141,7 +149,7 @@ struct bpf_program {
 #define                BPF_B           0x10
 /*                             0x18    reserved; used by BSD/OS */
 #define BPF_MODE(code) ((code) & 0xe0)
-#define                BPF_IMM         0x00
+#define                BPF_IMM 0x00
 #define                BPF_ABS         0x20
 #define                BPF_IND         0x40
 #define                BPF_MEM         0x60
@@ -235,36 +243,41 @@ struct bpf_program {
  */
 struct bpf_insn {
        u_short code;
-       u_char  jt;
-       u_char  jf;
+       u_char  jt;
+       u_char  jf;
        bpf_u_int32 k;
 };
 
-/*
- * Auxiliary data, for use when interpreting a filter intended for the
- * Linux kernel when the kernel rejects the filter (requiring us to
- * run it in userland).  It contains VLAN tag information.
- */
-struct bpf_aux_data {
-       u_short vlan_tag_present;
-       u_short vlan_tag;
-};
-
 /*
  * Macros for insn array initializers.
+ *
+ * In case somebody's included <linux/filter.h>, or something else that
+ * gives the kernel's definitions of BPF statements, get rid of its
+ * definitions, so we can supply ours instead.  If some kernel's
+ * definitions aren't *binary-compatible* with what BPF has had
+ * since it first sprung from the brows of Van Jacobson and Steve
+ * McCanne, that kernel should be fixed.
  */
+#ifdef BPF_STMT
+#undef BPF_STMT
+#endif
 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
+#ifdef BPF_JUMP
+#undef BPF_JUMP
+#endif
 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
 
-#if __STDC__ || defined(__cplusplus)
-extern int bpf_validate(const struct bpf_insn *, int);
-extern u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);
-extern u_int bpf_filter_with_aux_data(const struct bpf_insn *, const u_char *, u_int, u_int, const struct bpf_aux_data *);
-#else
-extern int bpf_validate();
-extern u_int bpf_filter();
-extern u_int bpf_filter();
-#endif
+PCAP_AVAILABLE_0_4
+PCAP_API u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);
+
+PCAP_AVAILABLE_0_6
+PCAP_API int   bpf_validate(const struct bpf_insn *f, int len);
+
+PCAP_AVAILABLE_0_4
+PCAP_API char  *bpf_image(const struct bpf_insn *, int);
+
+PCAP_AVAILABLE_0_6
+PCAP_API void  bpf_dump(const struct bpf_program *, int);
 
 /*
  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).