Hi list, need some info on dissecting mac tunnels.
Optical is a protocol that encapsulates ethernet
frames in another ethernet frame with an IP header. so
we have:
MAC-IP-MAC-trailers. I've stripped off the outer mac
and IP and am trying to call the ethernet disector to
break up the innner mac frame. Here's the code
static dissector_handle_t eth_handle;
eth_handle = find_dissector("eth");
int available_length = tvb_length(tvb) - 26;/*20 for
the ip header and 6 for the TLS*/
int reported_length = hlen - 26;
next_tvb = tvb_new_subset(
tvb,
26,
MIN(available_length, reported_length),
reported_length
);
call_dissector(eth_handle, next_tvb, pinfo,
parent_tree);
return;
All I get is [malformed IP Packet] after the first two
layers (i.e. the ouer MAc and IP) so it is calling the
eth dissector and it doesn't crash but it isn't
dissecting the inner ethernet and all the rest of the
layers above it.
Interesting problem, pls help.
I have also a problem concerning display of non byte
alligned data, the 6 bit post.
Please help as this protocol is going to be widely
used and dissection is important.
All the best
Charles
contact: c_s_wilkinson@xxxxxxxxxxx
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