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bridge_driver: handle DNS over IPv6

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* dnsmasq listens on all defined IPv[46] addresses for network
* Add ip6tables rules to allow DNS traffic to host
This commit is contained in:
Paweł Krześniak 2011-01-31 21:31:57 +01:00 committed by Laine Stump
parent bd6c46fa0c
commit 47969c055e
1 changed files with 41 additions and 10 deletions
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51
src/network/bridge_driver.c
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@ -432,6 +432,8 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
int r, ret = -1;
int nbleases = 0;
char *bridgeaddr;
int ii;
virNetworkIpDefPtr tmpipdef;
if (!(bridgeaddr = virSocketFormatAddr(&ipdef->address)))
goto cleanup;
@ -468,20 +470,28 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
/* *no* conf file */
virCommandAddArgList(cmd, "--conf-file=", "", NULL);
/*
* XXX does not actually work, due to some kind of
* race condition setting up ipv6 addresses on the
* interface. A sleep(10) makes it work, but that's
* clearly not practical
*
* virCommandAddArg(cmd, "--interface");
* virCommandAddArg(cmd, ipdef->bridge);
*/
virCommandAddArgList(cmd,
"--listen-address", bridgeaddr,
"--except-interface", "lo",
NULL);
/*
* --interface does not actually work with dnsmasq < 2.47,
* due to DAD for ipv6 addresses on the interface.
*
* virCommandAddArgList(cmd, "--interface", ipdef->bridge, NULL);
*
* So listen on all defined IPv[46] addresses
*/
for (ii = 0;
(tmpipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, ii));
ii++) {
char *ipaddr = virSocketFormatAddr(&tmpipdef->address);
if (!ipaddr)
goto cleanup;
virCommandAddArgList(cmd, "--listen-address", ipaddr, NULL);
VIR_FREE(ipaddr);
}
for (r = 0 ; r < ipdef->nranges ; r++) {
char *saddr = virSocketFormatAddr(&ipdef->ranges[r].start);
if (!saddr)
@ -1027,9 +1037,30 @@ networkAddGeneralIp6tablesRules(struct network_driver *driver,
goto err3;
}
/* allow DNS over IPv6 */
if (iptablesAddTcpInput(driver->iptables, AF_INET6,
network->def->bridge, 53) < 0) {
networkReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add ip6tables rule to allow DNS requests from '%s'"),
network->def->bridge);
goto err4;
}
if (iptablesAddUdpInput(driver->iptables, AF_INET6,
network->def->bridge, 53) < 0) {
networkReportError(VIR_ERR_SYSTEM_ERROR,
_("failed to add ip6tables rule to allow DNS requests from '%s'"),
network->def->bridge);
goto err5;
}
return 0;
/* unwind in reverse order from the point of failure */
err5:
iptablesRemoveTcpInput(driver->iptables, AF_INET6, network->def->bridge, 53);
err4:
iptablesRemoveForwardAllowCross(driver->iptables, AF_INET6, network->def->bridge);
err3:
iptablesRemoveForwardRejectIn(driver->iptables, AF_INET6, network->def->bridge);
err2: