1 files changed, 101 insertions, 0 deletions
diff --git a/proto_ipv6_dest_opts.c b/proto_ipv6_dest_opts.c
new file mode 100644
index 0000000..dfdd256
--- /dev/null
+++ b/proto_ipv6_dest_opts.c
@@ -0,0 +1,101 @@
+/*
+ * netsniff-ng - the packet sniffing beast
+ * Copyright 2012 Markus Amend <markus@netsniff-ng.org>, Deutsche Flugsicherung GmbH
+ * Subject to the GPL, version 2.
+ *
+ * IPv6 Destination Options Header described in RFC2460
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <netinet/in.h>    /* for ntohs() */
+
+#include "proto.h"
+#include "protos.h"
+#include "dissector_eth.h"
+#include "built_in.h"
+#include "pkt_buff.h"
+
+struct dest_optshdr {
+	uint8_t h_next_header;
+	uint8_t hdr_len;
+} __packed;
+
+
+static void dissect_opt_dest(struct pkt_buff *pkt, ssize_t *opt_len)
+{
+	/* Have to been upgraded.
+	 * http://tools.ietf.org/html/rfc2460#section-4.2
+	 * Look also for proto_ipv6_hop_by_hop.h, it needs
+	 * dissect_opt(), too.
+	 */
+	if (*opt_len)
+		tprintf(", Option(s) recognized ");
+
+	/* If adding dissector reduce opt_len for each using of pkt_pull
+	 * to the same size.
+	 */
+}
+
+static void dest_opts(struct pkt_buff *pkt)
+{
+	uint16_t hdr_ext_len;
+	ssize_t opt_len;
+	struct dest_optshdr *dest_ops;
+
+	dest_ops = (struct dest_optshdr *) pkt_pull(pkt, sizeof(*dest_ops));
+	if (dest_ops == NULL)
+		return;
+
+	/* Total Header Length in Bytes */
+	hdr_ext_len = (dest_ops->hdr_len + 1) * 8;
+	/* Options length in Bytes */
+	opt_len = hdr_ext_len - sizeof(*dest_ops);
+
+	tprintf("\t [ Destination Options ");
+	tprintf("NextHdr (%u), ", dest_ops->h_next_header);
+	if (opt_len > pkt_len(pkt) || opt_len < 0) {
+	      tprintf("HdrExtLen (%u, %u Bytes, %s)", dest_ops->hdr_len,
+		    hdr_ext_len, colorize_start_full(black, red)
+		    "invalid" colorize_end());
+		    return;
+	}
+	tprintf("HdrExtLen (%u, %u Bytes)", dest_ops->hdr_len,
+		hdr_ext_len);
+
+	dissect_opt_dest(pkt, &opt_len);
+
+	tprintf(" ]\n");
+
+	pkt_pull(pkt, opt_len);
+	pkt_set_proto(pkt, &eth_lay3, dest_ops->h_next_header);
+}
+
+static void dest_opts_less(struct pkt_buff *pkt)
+{
+	uint16_t hdr_ext_len;
+	ssize_t opt_len;
+	struct dest_optshdr *dest_ops;
+
+	dest_ops = (struct dest_optshdr *) pkt_pull(pkt, sizeof(*dest_ops));
+	if (dest_ops == NULL)
+		return;
+
+	/* Total Header Length in Bytes */
+	hdr_ext_len = (dest_ops->hdr_len + 1) * 8;
+	/* Options length in Bytes */
+	opt_len = hdr_ext_len - sizeof(*dest_ops);
+	if (opt_len > pkt_len(pkt) || opt_len < 0)
+		return;
+
+	tprintf(" Dest Ops");
+
+	pkt_pull(pkt, opt_len);
+	pkt_set_proto(pkt, &eth_lay3, dest_ops->h_next_header);
+}
+
+struct protocol ipv6_dest_opts_ops = {
+	.key = 0x3C,
+	.print_full = dest_opts,
+	.print_less = dest_opts_less,
+};