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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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2
ipn/ipnlocal/expiry.go
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@@ -116,7 +116,7 @@ func (em *expiryManager) flagExpiredPeers(netmap *netmap.NetworkMap, localNow ti
// since we discover endpoints via DERP, and due to DERP return
// path optimization.
mut.Endpoints = nil
mut.DERP = ""
mut.HomeDERP = 0
// Defense-in-depth: break the node's public key as well, in
// case something tries to communicate.