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control/controlclient: add detail to verbose log about route skips

This commit is contained in:
Brad Fitzpatrick 2021-01-20 19:28:21 -08:00
parent edf64e0901
commit b5628cee4e
1 changed files with 18 additions and 2 deletions
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20
control/controlclient/netmap.go
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@ -312,12 +312,14 @@ func (nm *NetworkMap) WGCfg(logf logger.Logf, flags WGConfigFlags) (*wgcfg.Confi
for _, allowedIP := range peer.AllowedIPs {
if allowedIP.Bits == 0 {
if (flags & AllowDefaultRoute) == 0 {
logf("[v1] wgcfg: %v skipping default route", peer.Key.ShortString())
logf("[v1] wgcfg: not accepting default route from %q (%v)",
nodeDebugName(peer), peer.Key.ShortString())
continue
}
} else if cidrIsSubnet(peer, allowedIP) {
if (flags & AllowSubnetRoutes) == 0 {
logf("[v1] wgcfg: %v skipping subnet route", peer.Key.ShortString())
logf("[v1] wgcfg: not accepting subnet route %v from %q (%v)",
allowedIP, nodeDebugName(peer), peer.Key.ShortString())
continue
}
}
@ -328,6 +330,20 @@ func (nm *NetworkMap) WGCfg(logf logger.Logf, flags WGConfigFlags) (*wgcfg.Confi
return cfg, nil
}
func nodeDebugName(n *tailcfg.Node) string {
name := n.Name
if name == "" {
name = n.Hostinfo.Hostname
}
if i := strings.Index(name, "."); i != -1 {
name = name[:i]
}
if name == "" && len(n.Addresses) != 0 {
return n.Addresses[0].String()
}
return name
}
// cidrIsSubnet reports whether cidr is a non-default-route subnet
// exported by node that is not one of its own self addresses.
func cidrIsSubnet(node *tailcfg.Node, cidr netaddr.IPPrefix) bool {