1 files changed, 104 insertions, 0 deletions
diff --git a/pkg/sentry/inet/inet.go b/pkg/sentry/inet/inet.go
new file mode 100644
index 000000000..7c104fd47
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+++ b/pkg/sentry/inet/inet.go
@@ -0,0 +1,104 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package inet defines semantics for IP stacks.
+package inet
+
+// Stack represents a TCP/IP stack.
+type Stack interface {
+	// Interfaces returns all network interfaces as a mapping from interface
+	// indexes to interface properties. Interface indices are strictly positive
+	// integers.
+	Interfaces() map[int32]Interface
+
+	// InterfaceAddrs returns all network interface addresses as a mapping from
+	// interface indexes to a slice of associated interface address properties.
+	InterfaceAddrs() map[int32][]InterfaceAddr
+
+	// SupportsIPv6 returns true if the stack supports IPv6 connectivity.
+	SupportsIPv6() bool
+
+	// TCPReceiveBufferSize returns TCP receive buffer size settings.
+	TCPReceiveBufferSize() (TCPBufferSize, error)
+
+	// SetTCPReceiveBufferSize attempts to change TCP receive buffer size
+	// settings.
+	SetTCPReceiveBufferSize(size TCPBufferSize) error
+
+	// TCPSendBufferSize returns TCP send buffer size settings.
+	TCPSendBufferSize() (TCPBufferSize, error)
+
+	// SetTCPSendBufferSize attempts to change TCP send buffer size settings.
+	SetTCPSendBufferSize(size TCPBufferSize) error
+
+	// TCPSACKEnabled returns true if RFC 2018 TCP Selective Acknowledgements
+	// are enabled.
+	TCPSACKEnabled() (bool, error)
+
+	// SetTCPSACKEnabled attempts to change TCP selective acknowledgement
+	// settings.
+	SetTCPSACKEnabled(enabled bool) error
+}
+
+// Interface contains information about a network interface.
+type Interface struct {
+	// Keep these fields sorted in the order they appear in rtnetlink(7).
+
+	// DeviceType is the device type, a Linux ARPHRD_* constant.
+	DeviceType uint16
+
+	// Flags is the device flags; see netdevice(7), under "Ioctls",
+	// "SIOCGIFFLAGS, SIOCSIFFLAGS".
+	Flags uint32
+
+	// Name is the device name.
+	Name string
+
+	// Addr is the hardware device address.
+	Addr []byte
+
+	// MTU is the maximum transmission unit.
+	MTU uint32
+}
+
+// InterfaceAddr contains information about a network interface address.
+type InterfaceAddr struct {
+	// Keep these fields sorted in the order they appear in rtnetlink(7).
+
+	// Family is the address family, a Linux AF_* constant.
+	Family uint8
+
+	// PrefixLen is the address prefix length.
+	PrefixLen uint8
+
+	// Flags is the address flags.
+	Flags uint8
+
+	// Addr is the actual address.
+	Addr []byte
+}
+
+// TCPBufferSize contains settings controlling TCP buffer sizing.
+//
+// +stateify savable
+type TCPBufferSize struct {
+	// Min is the minimum size.
+	Min int
+
+	// Default is the default size.
+	Default int
+
+	// Max is the maximum size.
+	Max int
+}