DnsmasqSetup Namespace Reference

Sets up iptables routing to allow apps within a network namespace to talk to the dnsmasq server running outside the container. More...

Functions
bool	set (const std::shared_ptr< DobbyRdkPluginUtils > &utils, const std::shared_ptr< Netfilter > &netfilter, const std::shared_ptr< NetworkingHelper > &helper, const std::string &rootfsPath, const std::string &containerId, const NetworkType networkType)
	Add iptables rules and create the /etc/resolv.conf file.
bool	removeRules (const std::shared_ptr< Netfilter > &netfilter, const std::shared_ptr< NetworkingHelper > &helper, const std::string &containerId)
	Deletes dnsmasq rules for the container.

Detailed Description

Sets up iptables routing to allow apps within a network namespace to talk to the dnsmasq server running outside the container.

This works by routing traffic sent to the dobby bridge on port 53 to the localhost interface outside the container.

Function Documentation

removeRules()

bool DnsmasqSetup::removeRules	(	const std::shared_ptr< Netfilter > &	netfilter,
		const std::shared_ptr< NetworkingHelper > &	helper,
		const std::string &	containerId
	)

Deletes dnsmasq rules for the container.

Run in postHalt hook.

Parameters

[in]	netfilter	Instance of Netfilter class
[in]	helper	Instance of NetworkingHelper.
[in]	containerId	Container identifier

Returns

true if successful, otherwise false

set()

bool DnsmasqSetup::set	(	const std::shared_ptr< DobbyRdkPluginUtils > &	utils,
		const std::shared_ptr< Netfilter > &	netfilter,
		const std::shared_ptr< NetworkingHelper > &	helper,
		const std::string &	rootfsPath,
		const std::string &	containerId,
		const NetworkType	networkType
	)

Add iptables rules and create the /etc/resolv.conf file.

Run in createRuntime hook.

Create a new /etc/resolv.conf file specifying the name server as our bridge interface. Add a PREROUTING rule to the iptable NAT table, which will redirect the traffic to localhost outside the container for port 53 only.

Parameters

[in]	utils	Instance of DobbyRdkPluginUtils class
[in]	netfilter	Instance of Netfilter class
[in]	helper	Instance of NetworkingHelper.
[in]	rootfsPath	Path to container rootfs on the host
[in]	containerId	Container identifier
[in]	networkType	Network type

Returns

true if successful, otherwise false