ferm/functions

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2014-12-19 19:50:19 +00:00
# Allow connections to public ports on the host
@def &allow_local($proto, $port) = {
domain (ip ip6) table filter chain INPUT protocol $proto dport $port ACCEPT;
}
# Defines a service residing in a given container
@def &def_service($service, $container, $proto, $port) = {
# look up IP addresses of the container
@def $ip4 = @resolve($container, A);
@def $ip6 = @resolve($container, AAAA);
# chain to allow forwarding to the service
domain (ip ip6) table filter chain @cat("allow_", $service) daddr @ipfilter(($ip4 $ip6)) protocol $proto dport $port ACCEPT;
# chain to do the DNAT to change the address / port to the one of the container / service
domain ip table nat chain @cat("fwd_to_", $service) protocol $proto DNAT to "$ip4:$port";
domain ip6 table nat chain @cat("fwd_to_", $service) protocol $proto DNAT to "[$ip6]:$port";
}
# Forwards a public port to the given service
@def &forward_to_service($service, $proto, $port) = {
domain (ip ip6) {
# allow forwarding to the service
table filter chain FORWARD jump @cat("allow_", $service);
table nat {
# change destination address / port to the one of the container / service
chain PREROUTING interface $internet protocol $proto dport $port jump @cat("fwd_to_", $service);
}
}
}
# Allows connection from the given container to the specified service (which resides in another container)
@def &allow_service_for($service, $container) = {
@def $ip4 = @resolve($container, A);
@def $ip6 = @resolve($container, AAAA);
domain (ip ip6) table filter chain FORWARD saddr @ipfilter(($ip4 $ip6)) jump @cat("allow_", $service);
}
# Allows connection a specific service to all containers
@def &allow_service_for_all($service) = {
domain (ip ip6) table filter chain FORWARD interface $bridge jump @cat("allow_", $service);
}
# ----------------
# currently unused
@def &forward_to($container, $proto, $port) = {
# look up IP addresses of the container
@def $ip4 = @resolve($container, A);
@def $ip6 = @resolve($container, AAAA);
domain (ip ip6) {
# allow forwarding to container
table filter chain FORWARD daddr @ipfilter(($ip4 $ip6)) protocol $proto dport $port ACCEPT;
# change destination address to the containers one
table nat chain PREROUTING interface $internet protocol $proto dport $port DNAT to @ipfilter($ip4 $ip6);
}
}