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ipn: program exit node into the data plane according to user pref.

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Part of #1153, #1154. Fixes #1224.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2021-01-20 17:24:16 -08:00
committed by Dave Anderson
parent fb6b0e247c
commit b9c2231fdf
7 changed files with 158 additions and 18 deletions
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27
ipn/prefs.go
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@@ -18,6 +18,7 @@ import (
"inet.af/netaddr"
"tailscale.com/atomicfile"
"tailscale.com/control/controlclient"
"tailscale.com/tailcfg"
"tailscale.com/types/preftype"
)
@@ -28,8 +29,10 @@ type Prefs struct {
// ControlURL is the URL of the control server to use.
ControlURL string
// RouteAll specifies whether to accept subnet and default routes
// advertised by other nodes on the Tailscale network.
// RouteAll specifies whether to accept subnets advertised by
// other nodes on the Tailscale network. Note that this does not
// include default routes (0.0.0.0/0 and ::/0), those are
// controlled by ExitNodeID/IP below.
RouteAll bool
// AllowSingleHosts specifies whether to install routes for each
@@ -44,6 +47,24 @@ type Prefs struct {
// packets stop flowing. What's up with that?
AllowSingleHosts bool
// ExitNodeID and ExitNodeIP specify the node that should be used
// as an exit node for internet traffic. At most one of these
// should be non-zero.
//
// The preferred way to express the chosen node is ExitNodeID, but
// in some cases it's not possible to use that ID (e.g. in the
// linux CLI, before tailscaled has a netmap). For those
// situations, we allow specifying the exit node by IP, and
// ipnlocal.LocalBackend will translate the IP into an ID when the
// node is found in the netmap.
//
// If the selected exit node doesn't exist (e.g. it's not part of
// the current tailnet), or it doesn't offer exit node services, a
// blackhole route will be installed on the local system to
// prevent any traffic escaping to the local network.
ExitNodeID tailcfg.StableNodeID
ExitNodeIP netaddr.IP
// CorpDNS specifies whether to install the Tailscale network's
// DNS configuration, if it exists.
CorpDNS bool
@@ -191,6 +212,8 @@ func (p *Prefs) Equals(p2 *Prefs) bool {
p.ControlURL == p2.ControlURL &&
p.RouteAll == p2.RouteAll &&
p.AllowSingleHosts == p2.AllowSingleHosts &&
p.ExitNodeID == p2.ExitNodeID &&
p.ExitNodeIP == p2.ExitNodeIP &&
p.CorpDNS == p2.CorpDNS &&
p.WantRunning == p2.WantRunning &&
p.NotepadURLs == p2.NotepadURLs &&