Merge branch 'master' into ip-forwarding

- Merges aleksej-paschenko's with HEAD
- Adds vfs2 support for ip_forward

1 files changed, 35 insertions, 1 deletions

diff --git a/pkg/sentry/inet/inet.go b/pkg/sentry/inet/inet.go
index 6217100b2..fbe6d6aa6 100644
--- a/pkg/sentry/inet/inet.go
+++ b/pkg/sentry/inet/inet.go
@@ -15,7 +15,10 @@
 // Package inet defines semantics for IP stacks.
 package inet
 
-import "gvisor.dev/gvisor/pkg/tcpip"
+import (
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+)
 
 // Stack represents a TCP/IP stack.
 type Stack interface {
@@ -28,6 +31,10 @@ type Stack interface {
 	// interface indexes to a slice of associated interface address properties.
 	InterfaceAddrs() map[int32][]InterfaceAddr
 
+	// AddInterfaceAddr adds an address to the network interface identified by
+	// index.
+	AddInterfaceAddr(idx int32, addr InterfaceAddr) error
+
 	// SupportsIPv6 returns true if the stack supports IPv6 connectivity.
 	SupportsIPv6() bool
 
@@ -52,6 +59,12 @@ type Stack interface {
 	// settings.
 	SetTCPSACKEnabled(enabled bool) error
 
+	// TCPRecovery returns the TCP loss detection algorithm.
+	TCPRecovery() (TCPLossRecovery, error)
+
+	// SetTCPRecovery attempts to change TCP loss detection algorithm.
+	SetTCPRecovery(recovery TCPLossRecovery) error
+
 	// Statistics reports stack statistics.
 	Statistics(stat interface{}, arg string) error
 
@@ -61,6 +74,16 @@ type Stack interface {
 	// Resume restarts the network stack after restore.
 	Resume()
 
+	// RegisteredEndpoints returns all endpoints which are currently registered.
+	RegisteredEndpoints() []stack.TransportEndpoint
+
+	// CleanupEndpoints returns endpoints currently in the cleanup state.
+	CleanupEndpoints() []stack.TransportEndpoint
+
+	// RestoreCleanupEndpoints adds endpoints to cleanup tracking. This is useful
+	// for restoring a stack after a save.
+	RestoreCleanupEndpoints([]stack.TransportEndpoint)
+
 	// Forwarding returns if packet forwarding between NICs is enabled.
 	Forwarding(protocol tcpip.NetworkProtocolNumber) bool
 
@@ -181,3 +204,14 @@ type StatSNMPUDP [8]uint64
 
 // StatSNMPUDPLite describes UdpLite line of /proc/net/snmp.
 type StatSNMPUDPLite [8]uint64
+
+// TCPLossRecovery indicates TCP loss detection and recovery methods to use.
+type TCPLossRecovery int32
+
+// Loss recovery constants from include/net/tcp.h which are used to set
+// /proc/sys/net/ipv4/tcp_recovery.
+const (
+	TCP_RACK_LOSS_DETECTION TCPLossRecovery = 1 << iota
+	TCP_RACK_STATIC_REO_WND
+	TCP_RACK_NO_DUPTHRESH
+)