For now, support "link[N:M]" filtering, but nothing else, for

DLT_IEEE802_11_RADIO (rather than supporting nothing, which keeps most
capture programs from working at all, as they set an empty filter if no
filter was explicitly supplied).

diff --git a/gencode.c b/gencode.c
index a29d92625715649b78ea35c53fe7994032a75c7a..c94be34a45da6209c490b4bbf9470112de2d373d 100644 (file)
--- a/gencode.c
+++ b/gencode.c
@@ -21,7 +21,7 @@
  */
 #ifndef lint
 static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.198 2004-01-29 10:36:43 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.199 2004-01-31 01:54:43 guy Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -882,6 +882,29 @@ init_linktype(type)
                off_nl_nosnap = 64+27;  /* Radio+802.11+802.2 */
                return;
 
+       case DLT_IEEE802_11_RADIO:
+               /*
+                * Same as 802.11, but with an additional header before
+                * the 802.11 header, containing a bunch of additional
+                * information including radio-level information.
+                *
+                * XXX - same variable-length header problem, only
+                * even *more* so; this header is also variable-length,
+                * with the length being the 16-bit number at an offset
+                * of 2 from the beginning of the radio header, and it's
+                * device-dependent (different devices might supply
+                * different amounts of information), so we can't even
+                * assume a fixed length for the current version of the
+                * header.
+                *
+                * Therefore, currently, only raw "link[N:M]" filtering is
+                * supported.
+                */
+               off_linktype = -1;
+               off_nl = -1;
+               off_nl_nosnap = -1;
+               return;
+
        case DLT_ATM_RFC1483:
        case DLT_ATM_CLIP:      /* Linux ATM defines this */
                /*