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From: Michael Tokarev <mjt@tls.msk.ru>
To: qemu-devel@nongnu.org
Cc: qemu-stable@nongnu.org, Laurent Vivier <lvivier@redhat.com>,
akihiko.odaki@daynix.com, Michael Tokarev <mjt@tls.msk.ru>
Subject: [Stable-9.1.3 64/65] net/dump: Correctly compute Ethernet packet
offset
Date: Fri, 7 Feb 2025 14:54:57 +0300
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From: Laurent Vivier <lvivier@redhat.com>
When a packet is sent with QEMU_NET_PACKET_FLAG_RAW by QEMU it
never includes virtio-net header even if qemu_get_vnet_hdr_len()
is not 0, and filter-dump is not managing this case.
The only user of QEMU_NET_PACKET_FLAG_RAW is announce_self,
we can show the problem using it and tcpddump:
- QEMU parameters:
.. -monitor stdio \
-netdev bridge,id=3Dnetdev0,br=3Dvirbr0 \
-device virtio-net,mac=3D9a:2b:2c:2d:2e:2f,netdev=3Dnetdev0 \
-object filter-dump,netdev=3Dnetdev0,file=3Dlog.pcap,id=3Dpcap0
- HMP command:
(qemu) announce_self
- TCP dump:
$ tcpdump -nxr log.pcap
without the fix:
08:00:06:04:00:03 > 2e:2f:80:35:00:01, ethertype Unknown (0x9a2b), leng=
th 50:
0x0000: 2c2d 2e2f 0000 0000 9a2b 2c2d 2e2f 0000
0x0010: 0000 0000 0000 0000 0000 0000 0000 0000
0x0020: 0000 0000
with the fix:
ARP, Reverse Request who-is 9a:2b:2c:2d:2e:2f tell 9a:2b:2c:2d:2e:2f, l=
ength 46
0x0000: 0001 0800 0604 0003 9a2b 2c2d 2e2f 0000
0x0010: 0000 9a2b 2c2d 2e2f 0000 0000 0000 0000
0x0020: 0000 0000 0000 0000 0000 0000 0000
Fixes: 481c52320a26 ("net: Strip virtio-net header when dumping")
Cc: akihiko.odaki@daynix.com
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(cherry picked from commit c6a1b591a68b4d7230d6c3f56965e18080d737e5)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/net/dump.c b/net/dump.c
index 956e34a123..42ab8d7716 100644
--- a/net/dump.c
+++ b/net/dump.c
@@ -155,7 +155,8 @@ static ssize_t filter_dump_receive_iov(NetFilterState *=
nf, NetClientState *sndr,
{
NetFilterDumpState *nfds =3D FILTER_DUMP(nf);
=20
- dump_receive_iov(&nfds->ds, iov, iovcnt, qemu_get_vnet_hdr_len(nf->net=
dev));
+ dump_receive_iov(&nfds->ds, iov, iovcnt, flags & QEMU_NET_PACKET_FLAG_=
RAW ?
+ 0 : qemu_get_vnet_hdr_len(nf->netdev));
return 0;
}
=20
--=20
2.39.5