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network: add iptables rules to explicitly allow forwarding 

Explicitly enable container networking for Fedora and other distros that
have a REJECT all rule at the end of their FORWARD table.
This commit is contained in:
Josh Poimboeuf 2013-11-01 18:29:25 -05:00
parent b5c984f9b4
commit ec4657b28a
2 changed files with 33 additions and 6 deletions
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AUTHORS
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@ -94,6 +94,7 @@ Jonathan Rudenberg <jonathan@titanous.com>
Joost Cassee <joost@cassee.net>
Jordan Arentsen <blissdev@gmail.com>
Joseph Anthony Pasquale Holsten <joseph@josephholsten.com>
Josh Poimboeuf <jpoimboe@redhat.com>
Julien Barbier <write0@gmail.com>
Jérôme Petazzoni <jerome.petazzoni@dotcloud.com>
Karan Lyons <karan@karanlyons.com>

38
network.go
View File

@ -168,12 +168,28 @@ func CreateBridgeIface(config *DaemonConfig) error {
}
if config.EnableIptables {
// Enable NAT
if output, err := iptables.Raw("-t", "nat", "-A", "POSTROUTING", "-s", ifaceAddr,
"!", "-d", ifaceAddr, "-j", "MASQUERADE"); err != nil {
return fmt.Errorf("Unable to enable network bridge NAT: %s", err)
} else if len(output) != 0 {
return fmt.Errorf("Error iptables postrouting: %s", output)
}
// Accept incoming packets for existing connections
if output, err := iptables.Raw("-I", "FORWARD", "-o", config.BridgeIface, "-m", "conntrack", "--ctstate", "RELATED,ESTABLISHED", "-j", "ACCEPT"); err != nil {
return fmt.Errorf("Unable to allow incoming packets: %s", err)
} else if len(output) != 0 {
return fmt.Errorf("Error iptables allow incoming: %s", output)
}
// Accept all non-intercontainer outgoing packets
if output, err := iptables.Raw("-I", "FORWARD", "-i", config.BridgeIface, "!", "-o", config.BridgeIface, "-j", "ACCEPT"); err != nil {
return fmt.Errorf("Unable to allow outgoing packets: %s", err)
} else if len(output) != 0 {
return fmt.Errorf("Error iptables allow outgoing: %s", output)
}
}
return nil
}
@ -680,20 +696,30 @@ func newNetworkManager(config *DaemonConfig) (*NetworkManager, error) {
// Configure iptables for link support
if config.EnableIptables {
args := []string{"FORWARD", "-i", config.BridgeIface, "-o", config.BridgeIface, "-j", "DROP"}
args := []string{"FORWARD", "-i", config.BridgeIface, "-o", config.BridgeIface, "-j"}
acceptArgs := append(args, "ACCEPT")
dropArgs := append(args, "DROP")
if !config.InterContainerCommunication {
if !iptables.Exists(args...) {
iptables.Raw(append([]string{"-D"}, acceptArgs...)...)
if !iptables.Exists(dropArgs...) {
utils.Debugf("Disable inter-container communication")
if output, err := iptables.Raw(append([]string{"-A"}, args...)...); err != nil {
if output, err := iptables.Raw(append([]string{"-I"}, dropArgs...)...); err != nil {
return nil, fmt.Errorf("Unable to prevent intercontainer communication: %s", err)
} else if len(output) != 0 {
return nil, fmt.Errorf("Error enabling iptables: %s", output)
return nil, fmt.Errorf("Error disabling intercontainer communication: %s", output)
}
}
} else {
utils.Debugf("Enable inter-container communication")
iptables.Raw(append([]string{"-D"}, args...)...)
iptables.Raw(append([]string{"-D"}, dropArgs...)...)
if !iptables.Exists(acceptArgs...) {
utils.Debugf("Enable inter-container communication")
if output, err := iptables.Raw(append([]string{"-I"}, acceptArgs...)...); err != nil {
return nil, fmt.Errorf("Unable to allow intercontainer communication: %s", err)
} else if len(output) != 0 {
return nil, fmt.Errorf("Error enabling intercontainer communication: %s", output)
}
}
}
}