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// 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
// Statistics reports stack statistics.
Statistics(stat interface{}, arg string) error
// RouteTable returns the network stack's route table.
RouteTable() []Route
// Resume restarts the network stack after restore.
Resume()
}
// Interface contains information about a network interface.
type Interface struct {
// 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 {
// 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
}
// StatDev describes one line of /proc/net/dev, i.e., stats for one network
// interface.
type StatDev [16]uint64
// Route contains information about a network route.
type Route struct {
// Family is the address family, a Linux AF_* constant.
Family uint8
// DstLen is the length of the destination address.
DstLen uint8
// SrcLen is the length of the source address.
SrcLen uint8
// TOS is the Type of Service filter.
TOS uint8
// Table is the routing table ID.
Table uint8
// Protocol is the route origin, a Linux RTPROT_* constant.
Protocol uint8
// Scope is the distance to destination, a Linux RT_SCOPE_* constant.
Scope uint8
// Type is the route origin, a Linux RTN_* constant.
Type uint8
// Flags are route flags. See rtnetlink(7) under "rtm_flags".
Flags uint32
// DstAddr is the route destination address (RTA_DST).
DstAddr []byte
// SrcAddr is the route source address (RTA_SRC).
SrcAddr []byte
// OutputInterface is the output interface index (RTA_OIF).
OutputInterface int32
// GatewayAddr is the route gateway address (RTA_GATEWAY).
GatewayAddr []byte
}
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