12:07 p.m.
The bit of code that sets the firewalld zone was previously a part of
the function networkAddFirewallRules(), which is not called for
networks with <forward mode='open'/>.
Setting the 'libvirt' zone for the bridge device of virtual networks
that also add firewall rules is usually necessary in order to get the
expected traffic through without modifying firewalld's default zone
(which would be a bad idea, because that would affect all the other
host interfaces set to the default zone), but in general we would
*not* want the bridge device for a mode='open' virtual network to be
automatically placed in the "libvirt" zone, a user might want to
*explicitly* set some other firewalld zone for mode='open' networks.
We enable this by moving the code that sets the firewalld zone into a
separate function that is called for all forward modes that use a
bridge device created by libvirt (nat, route, isolated, open). If no
zone is specified, then the bridge device will be in whatever zone
interfaces are put in by default, but if the <bridge> element has a
"zone" attribute, then the new bridge device will be placed in the
specified zone.
NB: This function is only called when the network is started, and
*not* when the firewall rules of an active network are reloaded at
virtnetworkd restart time, because the firewalld zone of an interface
isn't something that gets inadvertantly changed as a part of some
other unrelated action (e.g. all iptables rules are cleared by a
firewalld restart, including those rules added by libvirt), and so we
don't need to be re-setting it all the time.
Resolves: https://gitlab.com/libvirt/libvirt/-/issues/215
Signed-off-by: Laine Stump <laine(a)redhat.com>
---
src/network/bridge_driver.c | 4 ++
src/network/bridge_driver_linux.c | 61 ++++++++++++++++------------
src/network/bridge_driver_nop.c | 13 ++++++
src/network/bridge_driver_platform.h | 2 +
4 files changed, 54 insertions(+), 26 deletions(-)
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 915211d1b5..3504d512a0 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -1957,6 +1957,10 @@ networkStartNetworkVirtual(virNetworkDriverState *driver,
if (networkSetIPv6Sysctls(obj) < 0)
goto error;
+ /* set the firewall zone for the bridge device on the host */
+ if (networkSetBridgeZone(def) < 0)
+ goto error;
+
/* Add "once per network" rules */
if (def->forward.type != VIR_NETWORK_FORWARD_OPEN &&
networkAddFirewallRules(def, cfg->firewallBackend, &fwRemoval) < 0) {
diff --git a/src/network/bridge_driver_linux.c b/src/network/bridge_driver_linux.c
index fe7c6e193c..a6203a712e 100644
--- a/src/network/bridge_driver_linux.c
+++ b/src/network/bridge_driver_linux.c
@@ -333,28 +333,8 @@ int networkCheckRouteCollision(virNetworkDef *def)
int
-networkAddFirewallRules(virNetworkDef *def,
- virFirewallBackend firewallBackend,
- virFirewall **fwRemoval)
+networkSetBridgeZone(virNetworkDef *def)
{
-
- networkSetupPrivateChains(firewallBackend, false);
-
- if (errInitV4 &&
- (virNetworkDefGetIPByIndex(def, AF_INET, 0) ||
- virNetworkDefGetRouteByIndex(def, AF_INET, 0))) {
- virSetError(errInitV4);
- return -1;
- }
-
- if (errInitV6 &&
- (virNetworkDefGetIPByIndex(def, AF_INET6, 0) ||
- virNetworkDefGetRouteByIndex(def, AF_INET6, 0) ||
- def->ipv6nogw)) {
- virSetError(errInitV6);
- return -1;
- }
-
if (def->bridgeZone) {
/* if a firewalld zone has been specified, fail/log an error
@@ -370,12 +350,14 @@ networkAddFirewallRules(virNetworkDef *def,
if (virFirewallDInterfaceSetZone(def->bridge, def->bridgeZone) < 0)
return -1;
- } else {
+ } else if (def->forward.type != VIR_NETWORK_FORWARD_OPEN) {
- /* if firewalld is active, try to set the "libvirt" zone. This is
- * desirable (for consistency) if firewalld is using the iptables
- * backend, but is necessary (for basic network connectivity) if
- * firewalld is using the nftables backend
+ /* if firewalld is active, try to set the "libvirt" zone by
+ * default (forward mode='open' networks have no zone set by
+ * default, but we honor it if one is specified). This is
+ * desirable (for consistency) if firewalld is using the
+ * iptables backend, but is necessary (for basic network
+ * connectivity) if firewalld is using the nftables backend
*/
if (virFirewallDIsRegistered() == 0) {
@@ -421,6 +403,33 @@ networkAddFirewallRules(virNetworkDef *def,
}
}
+ return 0;
+}
+
+
+int
+networkAddFirewallRules(virNetworkDef *def,
+ virFirewallBackend firewallBackend,
+ virFirewall **fwRemoval)
+{
+
+ networkSetupPrivateChains(firewallBackend, false);
+
+ if (errInitV4 &&
+ (virNetworkDefGetIPByIndex(def, AF_INET, 0) ||
+ virNetworkDefGetRouteByIndex(def, AF_INET, 0))) {
+ virSetError(errInitV4);
+ return -1;
+ }
+
+ if (errInitV6 &&
+ (virNetworkDefGetIPByIndex(def, AF_INET6, 0) ||
+ virNetworkDefGetRouteByIndex(def, AF_INET6, 0) ||
+ def->ipv6nogw)) {
+ virSetError(errInitV6);
+ return -1;
+ }
+
switch (firewallBackend) {
case VIR_FIREWALL_BACKEND_NONE:
virReportError(VIR_ERR_NO_SUPPORT, "%s",
diff --git a/src/network/bridge_driver_nop.c b/src/network/bridge_driver_nop.c
index 8bf3367bff..20c7a2a595 100644
--- a/src/network/bridge_driver_nop.c
+++ b/src/network/bridge_driver_nop.c
@@ -38,6 +38,19 @@ int networkCheckRouteCollision(virNetworkDef *def G_GNUC_UNUSED)
return 0;
}
+
+int
+networkSetBridgeZone(virNetworkDef *def)
+{
+ if (def->bridgeZone) {
+ virReportError(VIR_ERR_NO_SUPPORT, "%s",
+ _("This platform does not support setting the bridge device
zone"));
+ return -1;
+ }
+ return 0;
+}
+
+
int networkAddFirewallRules(virNetworkDef *def G_GNUC_UNUSED,
virFirewallBackend firewallBackend,
virFirewall **fwRemoval G_GNUC_UNUSED)
diff --git a/src/network/bridge_driver_platform.h b/src/network/bridge_driver_platform.h
index cd2e3fa7b5..02abdc197f 100644
--- a/src/network/bridge_driver_platform.h
+++ b/src/network/bridge_driver_platform.h
@@ -32,6 +32,8 @@ void networkPostReloadFirewallRules(bool startup);
int networkCheckRouteCollision(virNetworkDef *def);
+int networkSetBridgeZone(virNetworkDef *def);
+
int networkAddFirewallRules(virNetworkDef *def,
virFirewallBackend firewallBackend,
virFirewall **fwRemoval);
--
2.46.0