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all: add Node.HomeDERP int, phase out "127.3.3.40:$region" hack [capver 111]

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This deprecates the old "DERP string" packing a DERP region ID into an
IP:port of 127.3.3.40:$REGION_ID and just uses an integer, like
PeerChange.DERPRegion does.

We still support servers sending the old form; they're converted to
the new form internally right when they're read off the network.

Updates #14636

Change-Id: I9427ec071f02a2c6d75ccb0fcbf0ecff9f19f26f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-01-14 10:19:52 -08:00
committed by Brad Fitzpatrick
parent 66269dc934
commit 2fc4455e6d
19 changed files with 171 additions and 97 deletions
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3
types/netmap/nodemut.go
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@@ -5,7 +5,6 @@ package netmap
import (
"cmp"
"fmt"
"net/netip"
"reflect"
"slices"
@@ -35,7 +34,7 @@ type NodeMutationDERPHome struct {
}
func (m NodeMutationDERPHome) Apply(n *tailcfg.Node) {
n.DERP = fmt.Sprintf("127.3.3.40:%v", m.DERPRegion)
n.HomeDERP = m.DERPRegion
}
// NodeMutation is a NodeMutation that says a node's endpoints have changed.