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net: Strip virtio-net header when dumping

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filter-dump specifiees Ethernet as PCAP LinkType, which does not expect
virtio-net header. Having virtio-net header in such PCAP file breaks
PCAP unconsumable. Unfortunately currently there is no LinkType for
virtio-net so for now strip virtio-net header to convert the output to
Ethernet.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Akihiko Odaki 2023-02-23 19:20:05 +09:00 • committed by Jason Wang
parent d921db0ae9
commit 481c52320a
4 changed files with 47 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

16
net/tap.c
View file

@ -255,6 +255,13 @@ static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
return !!tap_probe_vnet_hdr_len(s->fd, len);
}
static int tap_get_vnet_hdr_len(NetClientState *nc)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
return s->host_vnet_hdr_len;
}
static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
@ -268,6 +275,13 @@ static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
s->host_vnet_hdr_len = len;
}
static bool tap_get_using_vnet_hdr(NetClientState *nc)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
return s->using_vnet_hdr;
}
static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
@ -372,8 +386,10 @@ static NetClientInfo net_tap_info = {
.has_ufo = tap_has_ufo,
.has_vnet_hdr = tap_has_vnet_hdr,
.has_vnet_hdr_len = tap_has_vnet_hdr_len,
.get_using_vnet_hdr = tap_get_using_vnet_hdr,
.using_vnet_hdr = tap_using_vnet_hdr,
.set_offload = tap_set_offload,
.get_vnet_hdr_len = tap_get_vnet_hdr_len,
.set_vnet_hdr_len = tap_set_vnet_hdr_len,
.set_vnet_le = tap_set_vnet_le,
.set_vnet_be = tap_set_vnet_be,