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wgengine/netstack: don't remove 255.255.255.255/32 from netstack

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The intent of the updateIPs code is to add & remove IP addresses
to netstack based on what we get from the netmap.

But netstack itself adds 255.255.255.255/32 apparently and we always
fight it (and it adds it back?). So stop fighting it.

Updates #2642 (maybe fixes? maybe.)

Change-Id: I37cb23f8e3f07a42a1a55a585689ca51c2be7c60
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-12-16 13:55:41 -08:00 committed by Brad Fitzpatrick
parent 66164b9307
commit 5a9914a92f
1 changed files with 10 additions and 1 deletions
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11
wgengine/netstack/netstack.go
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@ -229,12 +229,21 @@ func ipPrefixToAddressWithPrefix(ipp netaddr.IPPrefix) tcpip.AddressWithPrefix {
} }
} }
var v4broadcast = netaddr.IPv4(255, 255, 255, 255)
func (ns *Impl) updateIPs(nm *netmap.NetworkMap) { func (ns *Impl) updateIPs(nm *netmap.NetworkMap) {
ns.atomicIsLocalIPFunc.Store(tsaddr.NewContainsIPFunc(nm.Addresses)) ns.atomicIsLocalIPFunc.Store(tsaddr.NewContainsIPFunc(nm.Addresses))
oldIPs := make(map[tcpip.AddressWithPrefix]bool) oldIPs := make(map[tcpip.AddressWithPrefix]bool)
for _, protocolAddr := range ns.ipstack.AllAddresses()[nicID] { for _, protocolAddr := range ns.ipstack.AllAddresses()[nicID] {
oldIPs[protocolAddr.AddressWithPrefix] = true ap := protocolAddr.AddressWithPrefix
ip := netaddrIPFromNetstackIP(ap.Address)
if ip == v4broadcast && ap.PrefixLen == 32 {
// Don't delete this one later. It seems to be important.
// Related to Issue 2642? Likely.
continue
}
oldIPs[ap] = true
} }
newIPs := make(map[tcpip.AddressWithPrefix]bool) newIPs := make(map[tcpip.AddressWithPrefix]bool)