mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-30 05:25:35 +00:00
c28f5767bf
Updates https://github.com/tailscale/corp/issues/19623 Change-Id: I7980e1fb736e234e66fa000d488066466c96ec85 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Co-authored-by: Andrew Dunham <andrew@du.nham.ca>
111 lines
3.7 KiB
Go
111 lines
3.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
// Package router presents an interface to manipulate the host network
|
|
// stack's state.
|
|
package router
|
|
|
|
import (
|
|
"net/netip"
|
|
"reflect"
|
|
|
|
"github.com/tailscale/wireguard-go/tun"
|
|
"tailscale.com/health"
|
|
"tailscale.com/net/netmon"
|
|
"tailscale.com/types/logger"
|
|
"tailscale.com/types/preftype"
|
|
)
|
|
|
|
// Router is responsible for managing the system network stack.
|
|
//
|
|
// There is typically only one instance of this interface per process.
|
|
type Router interface {
|
|
// Up brings the router up.
|
|
Up() error
|
|
|
|
// Set updates the OS network stack with a new Config. It may be
|
|
// called multiple times with identical Configs, which the
|
|
// implementation should handle gracefully.
|
|
Set(*Config) error
|
|
|
|
// UpdateMagicsockPort tells the OS network stack what port magicsock
|
|
// is currently listening on, so it can be threaded through firewalls
|
|
// and such. This is distinct from Set() since magicsock may rebind
|
|
// ports independently from the Config changing.
|
|
//
|
|
// network should be either "udp4" or "udp6".
|
|
UpdateMagicsockPort(port uint16, network string) error
|
|
|
|
// Close closes the router.
|
|
Close() error
|
|
}
|
|
|
|
// New returns a new Router for the current platform, using the
|
|
// provided tun device.
|
|
//
|
|
// If netMon is nil, it's not used. It's currently (2021-07-20) only
|
|
// used on Linux in some situations.
|
|
func New(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
|
|
logf = logger.WithPrefix(logf, "router: ")
|
|
return newUserspaceRouter(logf, tundev, netMon, health)
|
|
}
|
|
|
|
// CleanUp restores the system network configuration to its original state
|
|
// in case the Tailscale daemon terminated without closing the router.
|
|
// No other state needs to be instantiated before this runs.
|
|
func CleanUp(logf logger.Logf, netMon *netmon.Monitor, interfaceName string) {
|
|
cleanUp(logf, interfaceName)
|
|
}
|
|
|
|
// Config is the subset of Tailscale configuration that is relevant to
|
|
// the OS's network stack.
|
|
type Config struct {
|
|
// LocalAddrs are the address(es) for this node. This is
|
|
// typically one IPv4/32 (the 100.x.y.z CGNAT) and one
|
|
// IPv6/128 (Tailscale ULA).
|
|
LocalAddrs []netip.Prefix
|
|
|
|
// Routes are the routes that point into the Tailscale
|
|
// interface. These are the /32 and /128 routes to peers, as
|
|
// well as any other subnets that peers are advertising and
|
|
// this node has chosen to use.
|
|
Routes []netip.Prefix
|
|
|
|
// LocalRoutes are the routes that should not be routed through Tailscale.
|
|
// There are no priorities set in how these routes are added, normal
|
|
// routing rules apply.
|
|
LocalRoutes []netip.Prefix
|
|
|
|
// NewMTU is currently only used by the MacOS network extension
|
|
// app to set the MTU of the tun in the router configuration
|
|
// callback. If zero, the MTU is unchanged.
|
|
NewMTU int
|
|
|
|
// SubnetRoutes is the list of subnets that this node is
|
|
// advertising to other Tailscale nodes.
|
|
// As of 2023-10-11, this field is only used for network
|
|
// flow logging and is otherwise ignored.
|
|
SubnetRoutes []netip.Prefix
|
|
|
|
// Linux-only things below, ignored on other platforms.
|
|
SNATSubnetRoutes bool // SNAT traffic to local subnets
|
|
StatefulFiltering bool // Apply stateful filtering to inbound connections
|
|
NetfilterMode preftype.NetfilterMode // how much to manage netfilter rules
|
|
NetfilterKind string // what kind of netfilter to use (nftables, iptables)
|
|
}
|
|
|
|
func (a *Config) Equal(b *Config) bool {
|
|
if a == nil && b == nil {
|
|
return true
|
|
}
|
|
if (a == nil) != (b == nil) {
|
|
return false
|
|
}
|
|
return reflect.DeepEqual(a, b)
|
|
}
|
|
|
|
// shutdownConfig is a routing configuration that removes all router
|
|
// state from the OS. It's the config used when callers pass in a nil
|
|
// Config.
|
|
var shutdownConfig = Config{}
|