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network: pull global chain init into separate method

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Pull the logic for creating global iptables chains into a separate
method and protect its invocation with virOnce, to make it possible
to reuse it in non-startup paths.

Reviewed-by: Jim Fehlig <jfehlig@suse.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-05-21 11:37:37 +01:00
parent 435330d084
commit 4330d13852
1 changed files with 24 additions and 15 deletions
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39
src/network/bridge_driver_linux.c
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@ -35,22 +35,18 @@ VIR_LOG_INIT("network.bridge_driver_linux");
#define PROC_NET_ROUTE "/proc/net/route"
static virOnceControl createdOnce;
static bool createdChains;
static virErrorPtr errInitV4;
static virErrorPtr errInitV6;
void networkPreReloadFirewallRules(bool startup)
/* Only call via virOnce */
static void networkSetupPrivateChains(void)
{
bool created = false;
int rc;
/* We create global rules upfront as we don't want
* the perf hit of conditionally figuring out whether
* to create them each time a network is started.
*
* Any errors here are saved to be reported at time
* of starting the network though as that makes them
* more likely to be seen by a human
*/
createdChains = false;
rc = iptablesSetupPrivateChains(VIR_FIREWALL_LAYER_IPV4);
if (rc < 0) {
errInitV4 = virSaveLastError();
@ -58,9 +54,9 @@ void networkPreReloadFirewallRules(bool startup)
} else {
virFreeError(errInitV4);
errInitV4 = NULL;
if (rc)
createdChains = true;
}
if (rc)
created = true;
rc = iptablesSetupPrivateChains(VIR_FIREWALL_LAYER_IPV6);
if (rc < 0) {
@ -69,9 +65,22 @@ void networkPreReloadFirewallRules(bool startup)
} else {
virFreeError(errInitV6);
errInitV6 = NULL;
if (rc)
createdChains = true;
}
if (rc)
created = true;
}
void networkPreReloadFirewallRules(bool startup)
{
/* We create global rules upfront as we don't want
* the perf hit of conditionally figuring out whether
* to create them each time a network is started.
*
* Any errors here are saved to be reported at time
* of starting the network though as that makes them
* more likely to be seen by a human
*/
ignore_value(virOnce(&createdOnce, networkSetupPrivateChains));
/*
* If this is initial startup, and we just created the
@ -86,7 +95,7 @@ void networkPreReloadFirewallRules(bool startup)
* rules will be present. Thus we can safely just tell it
* to always delete from the builin chain
*/
if (startup && created)
if (startup && createdChains)
iptablesSetDeletePrivate(false);
}