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ipn/ipnlocal: add traffic steering support to exit-node suggestions (#16527)

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When `tailscale exit-node suggest` contacts the LocalAPI for a
suggested exit node, the client consults its netmap for peers that
contain the `suggest-exit-node` peercap. It currently uses a series of
heuristics to determine the exit node to suggest.

When the `traffic-steering` feature flag is enabled on its tailnet,
the client will defer to Control’s priority scores for a particular
peer. These scores, in `tailcfg.Hostinfo.Location.Priority`, were
historically only used for Mullvad exit nodes, but they have now been
extended to score any peer that could host a redundant resource.

Client capability version 119 is the earliest client that understands
these traffic steering scores. Control tells the client to switch to
rely on these scores by adding `tailcfg.NodeAttrTrafficSteering` to
its `AllCaps`.

Updates tailscale/corp#29966

Signed-off-by: Simon Law <sfllaw@tailscale.com>
This commit is contained in:
Simon Law
2025-07-10 22:15:55 -07:00
committed by GitHub
parent bd29a1c8c1
commit c18ba4470b
3 changed files with 546 additions and 8 deletions
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3
tailcfg/tailcfg.go
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@@ -163,7 +163,8 @@ type CapabilityVersion int
// - 116: 2025-05-05: Client serves MagicDNS "AAAA" if NodeAttrMagicDNSPeerAAAA set on self node
// - 117: 2025-05-28: Client understands DisplayMessages (structured health messages), but not necessarily PrimaryAction.
// - 118: 2025-07-01: Client sends Hostinfo.StateEncrypted to report whether the state file is encrypted at rest (#15830)
const CurrentCapabilityVersion CapabilityVersion = 118
// - 119: 2025-07-10: Client uses Hostinfo.Location.Priority to prioritize one route over another.
const CurrentCapabilityVersion CapabilityVersion = 119
// ID is an integer ID for a user, node, or login allocated by the
// control plane.