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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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10
ipn/ipnlocal/local.go
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@@ -7381,15 +7381,7 @@ func suggestExitNode(report *netcheck.Report, netMap *netmap.NetworkMap, prevSug
}
distances := make([]nodeDistance, 0, len(candidates))
for _, c := range candidates {
if c.DERP() != "" {
ipp, err := netip.ParseAddrPort(c.DERP())
if err != nil {
continue
}
if ipp.Addr() != tailcfg.DerpMagicIPAddr {
continue
}
regionID := int(ipp.Port())
if regionID := c.HomeDERP(); regionID != 0 {
candidatesByRegion[regionID] = append(candidatesByRegion[regionID], c)
continue
}