From: Guy Harris <guy@alum.mit.edu>
Date: Mon, 4 Jan 2010 20:06:40 +0000 (-0800)
Subject: Add DLT_IPV4 and DLT_IPV6.
X-Git-Tag: libpcap-1.1.0~42
X-Git-Url: https://git.tcpdump.org/libpcap/commitdiff_plain/add31c2e28feab1bf0aec0fc0ba494a7efc5fd4e?ds=sidebyside

Add DLT_IPV4 and DLT_IPV6.

DLT_IPV4 and DLT_IPV6 are like DLT_RAW, except that you know the version
of IP.

Also, get rid of some duplicate stuff for DLT_IPNET in savefile.c.
---

diff --git a/gencode.c b/gencode.c
index 7c0702ed..629ef5c7 100644
--- a/gencode.c
+++ b/gencode.c
@@ -1155,6 +1155,8 @@ init_linktype(p)
 		return;
 
 	case DLT_RAW:
+	case DLT_IPV4:
+	case DLT_IPV6:
 		off_linktype = -1;
 		off_macpl = 0;
 		off_nl = 0;
@@ -3176,6 +3178,32 @@ gen_linktype(proto)
 		/*NOTREACHED*/
 		break;
 
+	case DLT_IPV4:
+		/*
+		 * Raw IPv4, so no type field.
+		 */
+		if (proto == ETHERTYPE_IP)
+			return gen_true();		/* always true */
+
+		/* Checking for something other than IPv4; always false */
+		return gen_false();
+		/*NOTREACHED*/
+		break;
+
+	case DLT_IPV6:
+		/*
+		 * Raw IPv6, so no type field.
+		 */
+#ifdef INET6
+		if (proto == ETHERTYPE_IPV6)
+			return gen_true();		/* always true */
+#endif
+
+		/* Checking for something other than IPv6; always false */
+		return gen_false();
+		/*NOTREACHED*/
+		break;
+
 	case DLT_PPP:
 	case DLT_PPP_PPPD:
 	case DLT_PPP_SERIAL:
diff --git a/pcap.c b/pcap.c
index e81cc014..b0cf5f07 100644
--- a/pcap.c
+++ b/pcap.c
@@ -663,6 +663,8 @@ static struct dlt_choice dlt_choices[] = {
 	DLT_CHOICE(DLT_FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
 	DLT_CHOICE(DLT_IPNET, "Solaris ipnet"),
 	DLT_CHOICE(DLT_CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
+	DLT_CHOICE(DLT_IPV4, "Raw IPv4"),
+	DLT_CHOICE(DLT_IPV6, "Raw IPv6"),
 	DLT_CHOICE_SENTINEL
 };
 
diff --git a/pcap/bpf.h b/pcap/bpf.h
index 9df1011b..706ed237 100644
--- a/pcap/bpf.h
+++ b/pcap/bpf.h
@@ -953,13 +953,19 @@ struct bpf_version {
  */
 #define DLT_CAN_SOCKETCAN		227
 
+/*
+ * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
+ * whether it's v4 or v6.  Requested by Darren Reed <Darren.Reed@Sun.COM>.
+ */
+#define DLT_IPV4			228
+#define DLT_IPV6			229
+
 /*
  * IPNET
  */
 #define	IPNET_OUTBOUND		1
 #define	IPNET_INBOUND		2
 
-
 /*
  * DLT and savefile link type values are split into a class and
  * a member of that class.  A class value of 0 indicates a regular
diff --git a/savefile.c b/savefile.c
index 1a2f2bec..97046253 100644
--- a/savefile.c
+++ b/savefile.c
@@ -793,7 +793,12 @@ static const char rcsid[] _U_ =
  */
 #define LINKTYPE_CAN_SOCKETCAN			227
 
-#define	LINKTYPE_IPNET		226
+/*
+ * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
+ * whether it's v4 or v6.  Requested by Darren Reed <Darren.Reed@Sun.COM>.
+ */
+#define LINKTYPE_IPV4				228
+#define LINKTYPE_IPV6				229
 
 
 static struct linktype_map {
@@ -1137,8 +1142,9 @@ static struct linktype_map {
 	/* CAN frames with SocketCAN headers */
 	{ DLT_CAN_SOCKETCAN,	LINKTYPE_CAN_SOCKETCAN },
 
-	/* Solaris IPNET */
-	{ DLT_IPNET,		LINKTYPE_IPNET },
+	/* Raw IPv4/IPv6 */
+	{ DLT_IPV4,		LINKTYPE_IPV4 },
+	{ DLT_IPV6,		LINKTYPE_IPV6 },
 
 	{ -1,			-1 }
 };