Hi,
On Tue, Jul 26, 2005 at 06:08:44PM +0200, Gert Doering wrote:
> On Tue, Jul 26, 2005 at 05:45:15PM +0200, Hannes Gredler wrote:
>
> > i am anticipating a kernel issue -
> > typically we get this error message when the kernel tells us
> > that the payload is IPv4 [and in reality is IPv6] - that makes
> > the IPv4 printer bark;
>
> Might be an explanation, especially given the fact that the "capture
> related" part of the NetBSD GRE implementation wasn't changed at all
> when I added IPv6-over-GRE.
Thanks, Hannes - this was exactly the hint I was hoping for "look
*there* for problems".
Now it is working, both for IPv4 and IPv6 encapsulated in GRE/IPv4, and
both for sending and receiving packets:
[EMAIL PROTECTED]:/home/gert$ tcpdump -n -i gre0 -s0 -v
tcpdump: WARNING: BIOCPROMISC: Operation not permitted
tcpdump: listening on gre0, link-type NULL (BSD loopback), capture size 65535
bytes
22:12:49.707032 IP (tos 0x0, ttl 255, id 15, offset 0, flags [none], length:
100) 10.58.58.1 > 10.58.58.58: icmp 80: echo request seq 5869
22:12:49.707057 IP (tos 0x0, ttl 255, id 841, offset 0, flags [none], length:
100) 10.58.58.58 > 10.58.58.1: icmp 80: echo reply seq 5869
22:13:06.983691 2001:608:4:5555::1 > 2001:608:4:5555::5: [icmp6 sum ok] icmp6:
echo request seq 0 (len 60, hlim 64)
22:13:06.983738 2001:608:4:5555::5 > 2001:608:4:5555::1: [icmp6 sum ok] icmp6:
echo reply seq 0 (len 60, hlim 64)
The error was in sys/netinet/ip_gre.c - what it did was "always set
af=AF_INET before calling bpf_mtap()".
(I plead innocence, though - this was broken for NS and Appletalk before
I even touched the code :-) ).
I'll send out a PR to the NetBSD people ASAP.
As for the "why is libpcap-current crashing" problem, I'll look into
the struct pcap size/alignment questions later today.
gert
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Gert Doering - Munich, Germany [EMAIL PROTECTED]
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