Though Ethereal-0.8.20 supports an OSPFv3 dissector,
it seems that OSPFv3 header checksum calculation is something wrong.
rfc2470 says that a "pseudo-header" of IPv6 header fields
is used in OSPFv3 checksum calculation,
but I cannot find the corresponding source code in latest
CVS repository(packet-ospf.c).
below is a temporary patch in OSPFv3 header checksum calculation.
(I have compiled, but never tested).
Index: packet-ospf.c
===================================================================
RCS file: /cvsroot/ethereal/packet-ospf.c,v
retrieving revision 1.49
diff -u -r1.49 packet-ospf.c
--- packet-ospf.c 2001/11/26 04:52:50 1.49
+++ packet-ospf.c 2001/11/28 02:21:46
@@ -228,6 +228,15 @@
static void dissect_ospf_v3_address_prefix(tvbuff_t *, int, int, proto_tree *);
+struct pseudo_header
+{
+ struct in6_addr src;
+ struct in6_addr dst;
+ guint32 upper_len;
+ char zero[3];
+ guint8 nh;
+};
+
static void
dissect_ospf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
@@ -248,6 +257,7 @@
guint8 instance_ID;
guint8 reserved;
guint32 areaid;
+ struct pseudo_header pseudo_header;
if (check_col(pinfo->fd, COL_PROTOCOL))
@@ -309,6 +319,9 @@
/* The packet isn't part of a fragmented datagram and isn't
truncated, so we can checksum it. */
+ /* OSPFv2 - checksum calculation */
+ if ( version == OSPF_VERSION_2 ) {
+
/* Header, not including the authentication data (the OSPF
checksum excludes the 64-bit authentication field (which is an OS
PFv2-only field)). */
cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, 16);
@@ -324,6 +337,27 @@
/* There's nothing but a header. */
cksum_vec_len = 1;
}
+
+ }
+ /* OSPFv3 - checksum calculation */
+ else if ( version == OSPF_VERSION_3 ) {
+ memset(&pseudo_header, 0, sizeof(pseudo_header));
+ memcpy(&pseudo_header.src, pinfo->net_src.data, sizeof(struct in
6_addr));
+ memcpy(&pseudo_header.dst, pinfo->net_dst.data, sizeof(struct in
6_addr));
+ pseudo_header.upper_len = htonl(ospflen);
+ pseudo_header.nh = pinfo->ipproto;
+
+ cksum_vec[0].ptr = (guint8 *)&pseudo_header;
+ cksum_vec[0].len = sizeof(pseudo_header);
+ cksum_vec[1].ptr = tvb_get_ptr(tvb, 0, reported_length);
+ cksum_vec[1].len = reported_length;
+ cksum_vec_len = 2;
+ }
+ else {
+ /* XXX */
+ cksum_vec_len = 0;
+ }
+
computed_cksum = in_cksum(cksum_vec, cksum_vec_len);
if (computed_cksum == 0) {
proto_tree_add_text(ospf_header_tree, tvb, 12, 2,
