1:15 p.m.
Add nwfilter examples for ipv6 similar to existing ip filters.
Add appropriate docs for them and for some previously undocumented,
but existing filters. Also fix a typo and some formatting.
Aleksandr Alekseev (3):
example: fix typo and formatting
example: add ipv6 filters examples
doc: document new filters and not documented ones
docs/firewall.html.in | 9 ++++++
docs/formatnwfilter.html.in | 41 ++++++++++++++++++++++--
src/nwfilter/xml/allow-dhcp-server.xml | 4 +--
src/nwfilter/xml/allow-dhcp.xml | 4 +--
src/nwfilter/xml/allow-dhcpv6-server.xml | 27 ++++++++++++++++
src/nwfilter/xml/allow-dhcpv6.xml | 24 ++++++++++++++
src/nwfilter/xml/allow-incoming-ipv6.xml | 3 ++
src/nwfilter/xml/allow-ipv6.xml | 3 ++
src/nwfilter/xml/meson.build | 6 ++++
src/nwfilter/xml/no-ipv6-multicast.xml | 9 ++++++
src/nwfilter/xml/no-ipv6-spoofing.xml | 15 +++++++++
11 files changed, 138 insertions(+), 7 deletions(-)
create mode 100644 src/nwfilter/xml/allow-dhcpv6-server.xml
create mode 100644 src/nwfilter/xml/allow-dhcpv6.xml
create mode 100644 src/nwfilter/xml/allow-incoming-ipv6.xml
create mode 100644 src/nwfilter/xml/allow-ipv6.xml
create mode 100644 src/nwfilter/xml/no-ipv6-multicast.xml
create mode 100644 src/nwfilter/xml/no-ipv6-spoofing.xml
--
2.28.0.97.gdc04167d37
1:15 p.m.
New subject: [PATCH 1/3] example: fix typo and formatting
Signed-off-by: Aleksandr Alekseev <alexander.alekseev(a)virtuozzo.com>
---
src/nwfilter/xml/allow-dhcp-server.xml | 4 ++--
src/nwfilter/xml/allow-dhcp.xml | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/src/nwfilter/xml/allow-dhcp-server.xml
b/src/nwfilter/xml/allow-dhcp-server.xml
index 37e708ed4b..7fb426a660 100644
--- a/src/nwfilter/xml/allow-dhcp-server.xml
+++ b/src/nwfilter/xml/allow-dhcp-server.xml
@@ -1,7 +1,7 @@
<filter name='allow-dhcp-server' chain='ipv4'>
- <!-- accept outgoing DHCP requests -->
- <!-- note, this rule must be evaluated before general MAC broadcast
+ <!-- accept outgoing DHCP requests
+ note, this rule must be evaluated before general MAC broadcast
traffic is discarded since DHCP requests use MAC broadcast -->
<rule action='accept' direction='out' priority='100'>
<ip srcipaddr='0.0.0.0'
diff --git a/src/nwfilter/xml/allow-dhcp.xml b/src/nwfilter/xml/allow-dhcp.xml
index d66d2b6668..d205176011 100644
--- a/src/nwfilter/xml/allow-dhcp.xml
+++ b/src/nwfilter/xml/allow-dhcp.xml
@@ -1,7 +1,7 @@
<filter name='allow-dhcp' chain='ipv4'>
- <!-- accept outgoing DHCP requests -->
- <!-- not, this rule must be evaluated before general MAC broadcast
+ <!-- accept outgoing DHCP requests
+ note, this rule must be evaluated before general MAC broadcast
traffic is discarded since DHCP requests use MAC broadcast -->
<rule action='accept' direction='out' priority='100'>
<ip srcipaddr='0.0.0.0'
--
2.28.0.97.gdc04167d37
1:15 p.m.
New subject: [PATCH 2/3] example: add ipv6 filters examples
Signed-off-by: Aleksandr Alekseev <alexander.alekseev(a)virtuozzo.com>
---
src/nwfilter/xml/allow-dhcpv6-server.xml | 27 ++++++++++++++++++++++++
src/nwfilter/xml/allow-dhcpv6.xml | 24 +++++++++++++++++++++
src/nwfilter/xml/allow-incoming-ipv6.xml | 3 +++
src/nwfilter/xml/allow-ipv6.xml | 3 +++
src/nwfilter/xml/meson.build | 6 ++++++
src/nwfilter/xml/no-ipv6-multicast.xml | 9 ++++++++
src/nwfilter/xml/no-ipv6-spoofing.xml | 15 +++++++++++++
7 files changed, 87 insertions(+)
create mode 100644 src/nwfilter/xml/allow-dhcpv6-server.xml
create mode 100644 src/nwfilter/xml/allow-dhcpv6.xml
create mode 100644 src/nwfilter/xml/allow-incoming-ipv6.xml
create mode 100644 src/nwfilter/xml/allow-ipv6.xml
create mode 100644 src/nwfilter/xml/no-ipv6-multicast.xml
create mode 100644 src/nwfilter/xml/no-ipv6-spoofing.xml
diff --git a/src/nwfilter/xml/allow-dhcpv6-server.xml
b/src/nwfilter/xml/allow-dhcpv6-server.xml
new file mode 100644
index 0000000000..214a95f412
--- /dev/null
+++ b/src/nwfilter/xml/allow-dhcpv6-server.xml
@@ -0,0 +1,27 @@
+<filter name='allow-dhcpv6-server' chain='ipv6'>
+
+ <!-- accept outgoing DHCP requests.
+ note, this rule must be evaluated before general MAC broadcast
+ traffic is discarded since DHCP requests use MAC broadcast.
+ according to https://tools.ietf.org/html/rfc3315#section-14,
+ client sends messages to FF02::1:2 from link-local addresses -->
+ <rule action='accept' direction='out' priority='100'>
+ <ipv6 protocol='udp'
+ srcipaddr='FE80::'
+ srcipmask='10'
+ dstipaddr='FF02::1:2'
+ srcportstart='546'
+ dstportstart='547'/>
+ </rule>
+
+ <!-- accept incoming DHCP responses from a specific DHCP server
+ parameter DHPCSERVER needs to be passed from where this filter is
+ referenced -->
+ <rule action='accept' direction='in' priority='100' >
+ <ipv6 srcipaddr='$DHCPSERVER'
+ protocol='udp'
+ srcportstart='547'
+ dstportstart='546'/>
+ </rule>
+
+</filter>
diff --git a/src/nwfilter/xml/allow-dhcpv6.xml b/src/nwfilter/xml/allow-dhcpv6.xml
new file mode 100644
index 0000000000..f3512af153
--- /dev/null
+++ b/src/nwfilter/xml/allow-dhcpv6.xml
@@ -0,0 +1,24 @@
+<filter name='allow-dhcpv6' chain='ipv6'>
+
+ <!-- accept outgoing DHCP requests.
+ note, this rule must be evaluated before general MAC broadcast
+ traffic is discarded since DHCP requests use MAC broadcast.
+ according to https://tools.ietf.org/html/rfc3315#section-14,
+ client sends messages to FF02::1:2 from link-local addresses -->
+ <rule action='accept' direction='out' priority='100'>
+ <ipv6 protocol='udp'
+ srcipaddr='FE80::'
+ srcipmask='10'
+ dstipaddr='FF02::1:2'
+ srcportstart='546'
+ dstportstart='547'/>
+ </rule>
+
+ <!-- accept incoming DHCP responses from any DHCP server -->
+ <rule action='accept' direction='in' priority='100' >
+ <ipv6 protocol='udp'
+ srcportstart='547'
+ dstportstart='546'/>
+ </rule>
+
+</filter>
diff --git a/src/nwfilter/xml/allow-incoming-ipv6.xml
b/src/nwfilter/xml/allow-incoming-ipv6.xml
new file mode 100644
index 0000000000..93e1b18784
--- /dev/null
+++ b/src/nwfilter/xml/allow-incoming-ipv6.xml
@@ -0,0 +1,3 @@
+<filter name='allow-incoming-ipv6' chain='ipv6'>
+ <rule direction='in' action='accept'/>
+</filter>
diff --git a/src/nwfilter/xml/allow-ipv6.xml b/src/nwfilter/xml/allow-ipv6.xml
new file mode 100644
index 0000000000..8da5188cb9
--- /dev/null
+++ b/src/nwfilter/xml/allow-ipv6.xml
@@ -0,0 +1,3 @@
+<filter name='allow-ipv6' chain='ipv6'>
+ <rule direction='inout' action='accept'/>
+</filter>
diff --git a/src/nwfilter/xml/meson.build b/src/nwfilter/xml/meson.build
index 95af75bb15..0d96c54ebe 100644
--- a/src/nwfilter/xml/meson.build
+++ b/src/nwfilter/xml/meson.build
@@ -2,8 +2,12 @@ nwfilter_xml_files = [
'allow-arp.xml',
'allow-dhcp-server.xml',
'allow-dhcp.xml',
+ 'allow-dhcpv6-server.xml',
+ 'allow-dhcpv6.xml',
'allow-incoming-ipv4.xml',
+ 'allow-incoming-ipv6.xml',
'allow-ipv4.xml',
+ 'allow-ipv6.xml',
'clean-traffic-gateway.xml',
'clean-traffic.xml',
'no-arp-ip-spoofing.xml',
@@ -11,6 +15,8 @@ nwfilter_xml_files = [
'no-arp-spoofing.xml',
'no-ip-multicast.xml',
'no-ip-spoofing.xml',
+ 'no-ipv6-multicast.xml',
+ 'no-ipv6-spoofing.xml',
'no-mac-broadcast.xml',
'no-mac-spoofing.xml',
'no-other-l2-traffic.xml',
diff --git a/src/nwfilter/xml/no-ipv6-multicast.xml
b/src/nwfilter/xml/no-ipv6-multicast.xml
new file mode 100644
index 0000000000..a736366374
--- /dev/null
+++ b/src/nwfilter/xml/no-ipv6-multicast.xml
@@ -0,0 +1,9 @@
+<filter name='no-ipv6-multicast' chain='ipv6'>
+
+ <!-- drop if destination IP address is in the ff00::/8 subnet -->
+ <rule action='drop' direction='out'>
+ <ipv6 dstipaddr='FF00::' dstipmask='8' />
+ </rule>
+
+ <!-- not doing anything with receiving side ... -->
+</filter>
diff --git a/src/nwfilter/xml/no-ipv6-spoofing.xml
b/src/nwfilter/xml/no-ipv6-spoofing.xml
new file mode 100644
index 0000000000..a9ca690345
--- /dev/null
+++ b/src/nwfilter/xml/no-ipv6-spoofing.xml
@@ -0,0 +1,15 @@
+<filter name='no-ipv6-spoofing' chain='ipv6-ip'
priority='-610'>
+ <!-- allow UDP sent from link-local addresses (DHCP);
+ filter more exact later -->
+ <rule action='return' direction='out' priority='100'>
+ <ipv6 srcipaddr='FE80::' srcipmask='10'
protocol='udp'/>
+ </rule>
+
+ <!-- allow all known IP addresses -->
+ <rule direction='out' action='return' priority='500'>
+ <ipv6 srcipaddr='$IPV6'/>
+ </rule>
+
+ <!-- drop everything else -->
+ <rule direction='out' action='drop' priority='1000'/>
+</filter>
--
2.28.0.97.gdc04167d37
1:15 p.m.
New subject: [PATCH 3/3] doc: document new filters and not documented ones
Signed-off-by: Aleksandr Alekseev <alexander.alekseev(a)virtuozzo.com>
---
docs/firewall.html.in | 9 ++++++++
docs/formatnwfilter.html.in | 41 ++++++++++++++++++++++++++++++++++---
2 files changed, 47 insertions(+), 3 deletions(-)
diff --git a/docs/firewall.html.in b/docs/firewall.html.in
index 62f37e0eea..15b4f397be 100644
--- a/docs/firewall.html.in
+++ b/docs/firewall.html.in
@@ -283,12 +283,21 @@ UUID Name
15b1ab2b-b1ac-1be2-ed49-2042caba4abb allow-arp
6c51a466-8d14-6d11-46b0-68b1a883d00f allow-dhcp
7517ad6c-bd90-37c8-26c9-4eabcb69848d allow-dhcp-server
+7680776c-77aa-496f-90d6-13097664b925 allow-dhcpv6
+9cdaad60-7631-4172-8ccb-ef774be7485b allow-dhcpv6-server
3d38b406-7cf0-8335-f5ff-4b9add35f288 allow-incoming-ipv4
+908543c1-902e-45f6-a6ca-1a0ad35e7599 allow-incoming-ipv6
5ff06320-9228-2899-3db0-e32554933415 allow-ipv4
+ce8904cc-ad3a-4454-896c-53452882f817 allow-ipv6
db0b1767-d62b-269b-ea96-0cc8b451144e clean-traffic
+6d6ddcc8-1242-4c43-ac63-63af80493132 clean-traffic-gateway
+4cf38077-c7d5-4e25-99bb-6c4c9efad294 no-arp-ip-spoofing
+0b11a636-ce58-497f-be90-17f63c92487a no-arp-mac-spoofing
f88f1932-debf-4aa1-9fbe-f10d3aa4bc95 no-arp-spoofing
772f112d-52e4-700c-0250-e178a3d91a7a no-ip-multicast
7ee20370-8106-765d-f7ff-8a60d5aaf30b no-ip-spoofing
+f8a51c43-a08f-49b3-b9e2-393d54522dc0 no-ipv6-multicast
+a7f0afe9-a428-44b8-8566-c8ee2a669271 no-ipv6-spoofing
d5d3c490-c2eb-68b1-24fc-3ee362fc8af3 no-mac-broadcast
fb57c546-76dc-a372-513f-e8179011b48a no-mac-spoofing
dba10ea7-446d-76de-346f-335bd99c1d05 no-other-l2-traffic
diff --git a/docs/formatnwfilter.html.in b/docs/formatnwfilter.html.in
index 796c16549d..04aeda06ec 100644
--- a/docs/formatnwfilter.html.in
+++ b/docs/formatnwfilter.html.in
@@ -467,8 +467,7 @@ DSTPORTS = [ 80, 8080 ]
</tr>
<tr>
<td> IPV6 </td>
- <td> Not currently implemented:
- the list of IPV6 addresses in use by an interface </td>
+ <td> The list of IPV6 addresses in use by an interface </td>
</tr>
<tr>
<td> DHCPSERVER </td>
@@ -2011,11 +2010,35 @@ echo 3 > /proc/sys/net/netfilter/nf_conntrack_icmp_timeout
only allows ARP request and reply messages and enforces
that those packets contain the MAC and IP addresses
of the VM.</td>
+ </tr>
+ <tr>
+ <td> allow-arp </td>
+ <td> Allow ARP traffic in both directions</td>
+ </tr>
+ <tr>
+ <td> allow-ipv4 </td>
+ <td> Allow IPv4 traffic in both directions</td>
+ </tr>
+ <tr>
+ <td> allow-ipv6 </td>
+ <td> Allow IPv6 traffic in both directions</td>
+ </tr>
+ <tr>
+ <td> allow-incoming-ipv4 </td>
+ <td> Allow incoming IPv4 traffic</td>
+ </tr>
+ <tr>
+ <td> allow-incoming-ipv6 </td>
+ <td> Allow incoming IPv6 traffic</td>
</tr>
<tr>
<td> allow-dhcp </td>
<td> Allow a VM to request an IP address via DHCP (from any
DHCP server)</td>
+ </tr>
+ <tr>
+ <td> allow-dhcpv6 </td>
+ <td> Similar to allow-dhcp, but for DHCPv6 </td>
</tr>
<tr>
<td> allow-dhcp-server </td>
@@ -2023,16 +2046,28 @@ echo 3 > /proc/sys/net/netfilter/nf_conntrack_icmp_timeout
DHCP server. The dotted decimal IP address of the DHCP
server must be provided in a reference to this filter.
The name of the variable must be <i>DHCPSERVER</i>.</td>
+ </tr>
+ <tr>
+ <td> allow-dhcpv6-server </td>
+ <td> Similar to allow-dhcp-server, but for DHCPv6 </td>
</tr>
<tr>
<td> no-ip-spoofing </td>
- <td> Prevent a VM from sending of IP packets with
+ <td> Prevent a VM from sending of IPv4 packets with
a source IP address different from the one
in the packet. </td>
+ </tr>
+ <tr>
+ <td> no-ipv6-spoofing </td>
+ <td> Similar to no-ip-spoofing, but for IPv6 </td>
</tr>
<tr>
<td> no-ip-multicast </td>
<td> Prevent a VM from sending IP multicast packets. </td>
+ </tr>
+ <tr>
+ <td> no-ipv6-multicast </td>
+ <td> Similar to no-ip-multicast, but for IPv6 </td>
</tr>
<tr>
<td> clean-traffic </td>
--
2.28.0.97.gdc04167d37
10:54 a.m.
On a Thursday in 2020, Aleksandr Alekseev wrote:
Add nwfilter examples for ipv6 similar to existing ip filters.
Add appropriate docs for them and for some previously undocumented,
but existing filters. Also fix a typo and some formatting.
Aleksandr Alekseev (3):
example: fix typo and formatting
example: add ipv6 filters examples
doc: document new filters and not documented ones
docs/firewall.html.in | 9 ++++++
docs/formatnwfilter.html.in | 41 ++++++++++++++++++++++--
src/nwfilter/xml/allow-dhcp-server.xml | 4 +--
src/nwfilter/xml/allow-dhcp.xml | 4 +--
src/nwfilter/xml/allow-dhcpv6-server.xml | 27 ++++++++++++++++
src/nwfilter/xml/allow-dhcpv6.xml | 24 ++++++++++++++
src/nwfilter/xml/allow-incoming-ipv6.xml | 3 ++
src/nwfilter/xml/allow-ipv6.xml | 3 ++
src/nwfilter/xml/meson.build | 6 ++++
src/nwfilter/xml/no-ipv6-multicast.xml | 9 ++++++
src/nwfilter/xml/no-ipv6-spoofing.xml | 15 +++++++++
11 files changed, 138 insertions(+), 7 deletions(-)
create mode 100644 src/nwfilter/xml/allow-dhcpv6-server.xml
create mode 100644 src/nwfilter/xml/allow-dhcpv6.xml
create mode 100644 src/nwfilter/xml/allow-incoming-ipv6.xml
create mode 100644 src/nwfilter/xml/allow-ipv6.xml
create mode 100644 src/nwfilter/xml/no-ipv6-multicast.xml
create mode 100644 src/nwfilter/xml/no-ipv6-spoofing.xml
Reviewed-by: Ján Tomko <jtomko(a)redhat.com>
and pushed.
Jano
1465
days inactive
1478
days old
4 comments
2 participants
participants (2)
-
Aleksandr Alekseev -
Ján Tomko