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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
control/controlbase/conn_test.go
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@@ -280,7 +280,7 @@ func TestConnMemoryOverhead(t *testing.T) {
growthTotal := int64(ms.HeapAlloc) - int64(ms0.HeapAlloc)
growthEach := float64(growthTotal) / float64(num)
t.Logf("Alloced %v bytes, %.2f B/each", growthTotal, growthEach)
const max = 2000
const max = 2048
if growthEach > max {
t.Errorf("allocated more than expected; want max %v bytes/each", max)
}