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network: set mtu as a DHCP option when specified

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This adds an additional directive to the dnsmasq configuration file that
notifies clients via dhcp about the link's MTU. Guests can then choose
adjust their link accordingly.

Signed-off-by: Casey Callendrello <cdc@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Casey Callendrello 2018-12-11 17:05:43 +01:00 committed by Ján Tomko
parent 6dec641394
commit 682be11505
7 changed files with 93 additions and 0 deletions
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4
src/network/bridge_driver.c
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@ -1410,6 +1410,10 @@ networkDnsmasqConfContents(virNetworkObjPtr obj,
dctx->addnhostsfile->path);
}
/* Configure DHCP to tell clients about the MTU. */
if (def->mtu > 0)
virBufferAsprintf(&configbuf, "dhcp-option=option:mtu,%d\n", def->mtu);
/* Are we doing RA instead of radvd? */
if (DNSMASQ_RA_SUPPORT(caps)) {
if (ipv6def) {

19
tests/networkxml2confdata/nat-network-mtu.conf Normal file
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@ -0,0 +1,19 @@
##WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
##OVERWRITTEN AND LOST. Changes to this configuration should be made using:
## virsh net-edit default
## or other application using the libvirt API.
##
## dnsmasq conf file created by libvirt
strict-order
except-interface=lo
bind-dynamic
interface=virbr0
dhcp-range=192.168.122.2,192.168.122.254
dhcp-no-override
dhcp-authoritative
dhcp-lease-max=253
dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default.hostsfile
addn-hosts=/var/lib/libvirt/dnsmasq/default.addnhosts
dhcp-option=option:mtu,7000
dhcp-range=2001:db8:ac10:fe01::1,ra-only
dhcp-range=2001:db8:ac10:fd01::1,ra-only

22
tests/networkxml2confdata/nat-network-mtu.xml Normal file
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@ -0,0 +1,22 @@
<network>
<name>default</name>
<uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
<forward dev='eth1' mode='nat'/>
<bridge name='virbr0' stp='on' delay='0'/>
<mtu size='7000'/>
<ip address='192.168.122.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.122.2' end='192.168.122.254'/>
<host mac='00:16:3e:77:e2:ed' name='a.example.com' ip='192.168.122.10'/>
<host mac='00:16:3e:3e:a9:1a' name='b.example.com' ip='192.168.122.11'/>
</dhcp>
</ip>
<ip family='ipv4' address='192.168.123.1' netmask='255.255.255.0'>
</ip>
<ip family='ipv6' address='2001:db8:ac10:fe01::1' prefix='64'>
</ip>
<ip family='ipv6' address='2001:db8:ac10:fd01::1' prefix='64'>
</ip>
<ip family='ipv4' address='10.24.10.1'>
</ip>
</network>

1
tests/networkxml2conftest.c
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@ -136,6 +136,7 @@ mymain(void)
DO_TEST("nat-network-dns-forwarders", full);
DO_TEST("nat-network-dns-forwarder-no-resolv", full);
DO_TEST("nat-network-dns-local-domain", full);
DO_TEST("nat-network-mtu", dhcpv6);
DO_TEST("dhcp6-network", dhcpv6);
DO_TEST("dhcp6-nat-network", dhcpv6);
DO_TEST("dhcp6host-routed-network", dhcpv6);

22
tests/networkxml2xmlin/nat-network-mtu.xml Normal file
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@ -0,0 +1,22 @@
<network>
<name>default</name>
<uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
<bridge name="virbr0"/>
<mtu size='7000'/>
<forward mode="nat" dev="eth1"/>
<ip address="192.168.122.1" netmask="255.255.255.0">
<dhcp>
<range start="192.168.122.2" end="192.168.122.254"/>
<host mac="00:16:3e:77:e2:ed" name="a.example.com" ip="192.168.122.10"/>
<host mac="00:16:3e:3e:a9:1a" name="b.example.com" ip="192.168.122.11"/>
</dhcp>
</ip>
<ip family="ipv4" address="192.168.123.1" netmask="255.255.255.0">
</ip>
<ip family="ipv6" address="2001:db8:ac10:fe01::1" prefix="64">
</ip>
<ip family="ipv6" address="2001:db8:ac10:fd01::1" prefix="64">
</ip>
<ip family="ipv4" address="10.24.10.1">
</ip>
</network>

24
tests/networkxml2xmlout/nat-network-mtu.xml Normal file
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@ -0,0 +1,24 @@
<network>
<name>default</name>
<uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
<forward dev='eth1' mode='nat'>
<interface dev='eth1'/>
</forward>
<bridge name='virbr0' stp='on' delay='0'/>
<mtu size='7000'/>
<ip address='192.168.122.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.122.2' end='192.168.122.254'/>
<host mac='00:16:3e:77:e2:ed' name='a.example.com' ip='192.168.122.10'/>
<host mac='00:16:3e:3e:a9:1a' name='b.example.com' ip='192.168.122.11'/>
</dhcp>
</ip>
<ip family='ipv4' address='192.168.123.1' netmask='255.255.255.0'>
</ip>
<ip family='ipv6' address='2001:db8:ac10:fe01::1' prefix='64'>
</ip>
<ip family='ipv6' address='2001:db8:ac10:fd01::1' prefix='64'>
</ip>
<ip family='ipv4' address='10.24.10.1'>
</ip>
</network>

1
tests/networkxml2xmltest.c
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@ -141,6 +141,7 @@ mymain(void)
DO_TEST("nat-network-dns-forwarder-no-resolv");
DO_TEST("nat-network-forward-nat-address");
DO_TEST("nat-network-forward-nat-no-address");
DO_TEST("nat-network-mtu");
DO_TEST("8021Qbh-net");
DO_TEST("direct-net");
DO_TEST("host-bridge-net");