Qemu currently sends an Ethernet packet with protocol id 0x835 once a VM
was successfully migrated. The content of the packet looks like a
gratuitous RARP, just with the wrong protocol ID, which should be
0x8035. I wrote some filters to let either one of the packets pass and
am adapting the clean-traffic sample filter to use it. I am also
doing some changes on the existing ARP filter which was lacking a
test for source MAC address.
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxx>
---
examples/xml/nwfilter/Makefile.am | 5 ++++-
examples/xml/nwfilter/clean-traffic.xml | 3 +++
examples/xml/nwfilter/no-arp-spoofing.xml | 13 ++++++++-----
examples/xml/nwfilter/no-other-rarp-traffic.xml | 4 ++++
examples/xml/nwfilter/qemu-announce-self-rarp.xml | 14 ++++++++++++++
examples/xml/nwfilter/qemu-announce-self.xml | 13 +++++++++++++
6 files changed, 46 insertions(+), 6 deletions(-)
Index: libvirt-acl/examples/xml/nwfilter/Makefile.am
===================================================================
--- libvirt-acl.orig/examples/xml/nwfilter/Makefile.am
+++ libvirt-acl/examples/xml/nwfilter/Makefile.am
@@ -11,7 +11,10 @@ FILTERS = \
no-ip-spoofing.xml \
no-mac-broadcast.xml \
no-mac-spoofing.xml \
- no-other-l2-traffic.xml
+ no-other-l2-traffic.xml \
+ no-other-rarp-traffic.xml \
+ qemu-announce-self.xml \
+ qemu-announce-self-rarp.xml
EXTRA_DIST=$(FILTERS)
Index: libvirt-acl/examples/xml/nwfilter/qemu-announce-self-rarp.xml
===================================================================
--- /dev/null
+++ libvirt-acl/examples/xml/nwfilter/qemu-announce-self-rarp.xml
@@ -0,0 +1,14 @@
+<filter name='qemu-announce-self-rarp' chain='rarp'>
+ <rule action='accept' direction='out' priority='500'>
+ <rarp opcode='Request_Reverse'
+ srcmacaddr='$MAC' dstmacaddr='ff:ff:ff:ff:ff:ff'
+ arpsrcmacaddr='$MAC' arpdstmacaddr='$MAC'
+ arpsrcipaddr='0.0.0.0' arpdstipaddr='0.0.0.0'/>
+ </rule>
+ <rule action='accept' direction='in' priority='500'>
+ <rarp opcode='Request_Reverse'
+ dstmacaddr='ff:ff:ff:ff:ff:ff'
+ arpsrcmacaddr='$MAC' arpdstmacaddr='$MAC'
+ arpsrcipaddr='0.0.0.0' arpdstipaddr='0.0.0.0'/>
+ </rule>
+</filter>
Index: libvirt-acl/examples/xml/nwfilter/clean-traffic.xml
===================================================================
--- libvirt-acl.orig/examples/xml/nwfilter/clean-traffic.xml
+++ libvirt-acl/examples/xml/nwfilter/clean-traffic.xml
@@ -14,4 +14,7 @@
<!-- preventing any other traffic than IPv4 and ARP -->
<filterref filter='no-other-l2-traffic'/>
+ <!-- allow qemu to send a self-announce upon migration end -->
+ <filterref filter='qemu-announce-self'/>
+
</filter>
Index: libvirt-acl/examples/xml/nwfilter/no-arp-spoofing.xml
===================================================================
--- libvirt-acl.orig/examples/xml/nwfilter/no-arp-spoofing.xml
+++ libvirt-acl/examples/xml/nwfilter/no-arp-spoofing.xml
@@ -1,27 +1,30 @@
<filter name='no-arp-spoofing' chain='arp'>
<uuid>f88f1932-debf-4aa1-9fbe-f10d3aa4bc95</uuid>
+ <rule action='drop' direction='out' priority='300' >
+ <mac match='no' srcmacaddr='$MAC'/>
+ </rule>
<!-- no arp spoofing -->
<!-- drop if ipaddr or macaddr does not belong to guest -->
- <rule action='drop' direction='out' priority='400' >
+ <rule action='drop' direction='out' priority='350' >
<arp match='no' arpsrcmacaddr='$MAC'/>
</rule>
<rule action='drop' direction='out' priority='400' >
<arp match='no' arpsrcipaddr='$IP' />
</rule>
<!-- drop if ipaddr or macaddr odes not belong to guest -->
- <rule action='drop' direction='in' priority='400' >
+ <rule action='drop' direction='in' priority='450' >
<arp match='no' arpdstmacaddr='$MAC'/>
<arp opcode='reply'/>
</rule>
- <rule action='drop' direction='in' priority='400' >
+ <rule action='drop' direction='in' priority='500' >
<arp match='no' arpdstipaddr='$IP' />
</rule>
<!-- accept only request or reply packets -->
- <rule action='accept' direction='inout' priority='500' >
+ <rule action='accept' direction='inout' priority='600' >
<arp opcode='request'/>
</rule>
- <rule action='accept' direction='inout' priority='500' >
+ <rule action='accept' direction='inout' priority='650' >
<arp opcode='reply'/>
</rule>
<!-- drop everything else -->
Index: libvirt-acl/examples/xml/nwfilter/no-other-rarp-traffic.xml
===================================================================
--- /dev/null
+++ libvirt-acl/examples/xml/nwfilter/no-other-rarp-traffic.xml
@@ -0,0 +1,4 @@
+<filter name='no-other-rarp-traffic' chain='rarp'>
+ <rule action='drop' direction='inout' priority='1000'/>
+</filter>
+
Index: libvirt-acl/examples/xml/nwfilter/qemu-announce-self.xml
===================================================================
--- /dev/null
+++ libvirt-acl/examples/xml/nwfilter/qemu-announce-self.xml
@@ -0,0 +1,13 @@
+<filter name='qemu-announce-self' chain='root'>
+ <!-- as of 4/26/2010 qemu sends out a bogus packet with
+ wrong rarp protocol ID -->
+ <!-- accept what is being sent now -->
+ <rule action='accept' direction='out'>
+ <mac protocolid='0x835'/>
+ </rule>
+
+ <!-- accept if it was changed to rarp -->
+ <filterref filter='qemu-announce-self-rarp'/>
+ <filterref filter='no-other-rarp-traffic'/>
+
+</filter>
--
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