Commit tcpdump.org's multi-DLT support to vendor branch.

contrib/libpcap/VERSION

@@ -1 +1 @@
-0.7
+0.7+multidlt

contrib/libpcap/gencode.c

@@ -564,6 +564,11 @@ init_linktype(type)
 		off_nl = 6;	/* XXX in reality, variable! */
 		return;
 
+	case DLT_IEEE802_11:
+		off_linktype = 30; /* XXX variable */
+		off_nl = 32;
+		return;
+
 	case DLT_EN10MB:
 		off_linktype = 12;
 		off_nl = 14;
@@ -659,6 +664,7 @@ init_linktype(type)
 		off_nl = 22;
 		return;
 
+#ifdef notdef
 	case DLT_IEEE802_11:
 		/*
 		 * 802.11 doesn't really have a link-level type field.
@@ -675,6 +681,7 @@ init_linktype(type)
 		off_linktype = 24;
 		off_nl = 30;
 		return;
+#endif
 
 	case DLT_PRISM_HEADER:
 		/*

contrib/libpcap/pcap-bpf.c

@@ -204,9 +204,12 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
 	int fd;
 	struct ifreq ifr;
 	struct bpf_version bv;
+	struct bpf_dltlist bdl;
 	u_int v;
 	pcap_t *p;
 
+	bzero(&bdl, sizeof(bdl));
+
 	p = (pcap_t *)malloc(sizeof(*p));
 	if (p == NULL) {
 		snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
@@ -323,6 +326,30 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
 #endif
 	p->linktype = v;
 
+	/*
+	 * We know the default link type -- now determine any additional
+	 * DLTs this interface supports.  If this fails, it's not fatal;
+	 * we just don't get to use the feature later.
+	 */
+	if (ioctl(fd, BIOCGDLTLIST, (caddr_t) &bdl) == 0) {
+		bdl.bfl_list = (u_int *) malloc(sizeof(u_int) * bdl.bfl_len);
+		if (bdl.bfl_list == NULL) {
+			(void)snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
+			    pcap_strerror(errno));
+			goto bad;
+		}
+
+		if (ioctl(fd, BIOCGDLTLIST, (caddr_t) &bdl) < 0) {
+			(void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
+			    "BIOCGDLTLIST: %s", pcap_strerror(errno));
+			free(bdl.bfl_list);
+			goto bad;
+		}
+
+		p->dlt_count = bdl.bfl_len;
+		p->dlt_list = bdl.bfl_list;
+	}
+
 	/* set timeout */
 	if (to_ms != 0) {
 		struct timeval to;
@@ -416,6 +443,8 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
 	return (p);
  bad:
 	(void)close(fd);
+	if (bdl.bfl_list != NULL)
+		free(bdl.bfl_list);
 	free(p);
 	return (NULL);
 }
@@ -441,3 +470,25 @@ pcap_setfilter(pcap_t *p, struct bpf_program *fp)
 	}
 	return (0);
 }
+
+int
+pcap_set_datalink(pcap_t *p, int dlt)
+{
+	int i;
+
+	for (i = 0; i < p->dlt_count; i++)
+		if (p->dlt_list[i] == dlt)
+			break;
+	if (i >= p->dlt_count) {
+		(void) snprintf(p->errbuf, sizeof(p->errbuf),
+		    "No such DLT as %d", dlt);
+		return -1;
+	}
+	if (ioctl(p->fd, BIOCSDLT, &dlt) == -1) {
+		(void) snprintf(p->errbuf, sizeof(p->errbuf),
+		    "Cannot set DLT %d: %s", dlt, strerror(errno));
+		return -1;
+	}
+	p->linktype = dlt;
+	return 0;
+}

contrib/libpcap/pcap-int.h

@@ -104,6 +104,8 @@ struct pcap {
 	struct bpf_program fcode;
 
 	char errbuf[PCAP_ERRBUF_SIZE];
+	int dlt_count;
+	int *dlt_list;
 };
 
 /*

contrib/libpcap/pcap.3

@@ -82,6 +82,8 @@ u_char *pcap_next(pcap_t *p, struct pcap_pkthdr *h)
 .LP
 .ft B
 int pcap_datalink(pcap_t *p)
+int pcap_list_datalinks(pcap_t *p, int **dlt_buf);
+int pcap_set_datalink(pcap_t *p, int dlt);
 int pcap_snapshot(pcap_t *p)
 int pcap_is_swapped(pcap_t *p)
 int pcap_major_version(pcap_t *p)
@@ -663,6 +665,34 @@ header or 4 for frames beginning with an 802.2 LLC header.
 Apple LocalTalk; the packet begins with an AppleTalk LLAP header
 .RE
 .PP
+.B pcap_list_datalinks()
+is used to get a list of the supported data link types of the interface
+associated with the pcap descriptor.
+.B pcap_list_datalinks()
+allocates an array to hold the list and sets
+.IR *dlt_buf .
+The caller is responsible for freeing the array.
+.B \-1
+is returned on failure;
+otherwise, the number of data link types in the array is returned.
+.PP
+.B pcap_set_datalink()
+is used to set the current data link type of the pcap descriptor
+to the type specified by
+.IR dlt .
+.B \-1
+is returned on failure.
+.PP
+.B pcap_datalink_name_to_val()
+translates a data link type name, which is a
+.B DLT_
+name with the
+.B DLT_
+removed, to the corresponding data link type value.  The translation
+is case-insensitive.  
+is used to set the current data link type of the pcap descriptor
+NULL is returned on failure.
+.PP
 .B pcap_snapshot()
 returns the snapshot length specified when
 .B pcap_open_live

contrib/libpcap/pcap.c

@@ -122,6 +122,24 @@ pcap_datalink(pcap_t *p)
 	return (p->linktype);
 }
 
+int
+pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
+{
+	if (p->dlt_count <= 0) {
+		*dlt_buffer = NULL;
+		return -1;
+	}
+	*dlt_buffer = (int*)malloc(sizeof(**dlt_buffer) * p->dlt_count);
+	if (*dlt_buffer == NULL) {
+		(void)snprintf(p->errbuf, sizeof(p->errbuf), "malloc: %s",
+		    pcap_strerror(errno));
+		return -1;
+	}
+	(void)memcpy(*dlt_buffer, p->dlt_list,
+	    sizeof(**dlt_buffer) * p->dlt_count);
+	return (p->dlt_count);
+}
+
 int
 pcap_snapshot(pcap_t *p)
 {
@@ -281,6 +299,8 @@ pcap_close(pcap_t *p)
 			free(p->sf.base);
 	} else if (p->buffer != NULL)
 		free(p->buffer);
+	if (p->dlt_list != NULL)
+		free(p->dlt_list);
 	
 	pcap_freecode(&p->fcode);
 	free(p);

contrib/libpcap/pcap.h

@@ -181,6 +181,8 @@ int	pcap_compile_nopcap(int, int, struct bpf_program *,
 	    char *, int, bpf_u_int32);
 void	pcap_freecode(struct bpf_program *);
 int	pcap_datalink(pcap_t *);
+int	pcap_list_datalinks(pcap_t *, int **);
+int	pcap_set_datalink(pcap_t *, int);
 int	pcap_snapshot(pcap_t *);
 int	pcap_is_swapped(pcap_t *);
 int	pcap_major_version(pcap_t *);