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net/tsaddr: add func ContainsExitRoutes

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Change-Id: I772441a406083e2fe0f9374b2b23d89aac18928f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-03-04 08:00:53 -08:00
committed by Brad Fitzpatrick
parent 7ddf2e2fea
commit b493ef5b71
2 changed files with 27 additions and 12 deletions
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25
net/tsaddr/tsaddr.go
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@ -213,3 +213,28 @@ func PrefixIs4(p netaddr.IPPrefix) bool { return p.IP().Is4() }
// PrefixIs6 reports whether p is an IPv6 prefix.
func PrefixIs6(p netaddr.IPPrefix) bool { return p.IP().Is6() }
// ContainsExitRoutes reports whether rr contains both the IPv4 and
// IPv6 /0 route.
func ContainsExitRoutes(rr []netaddr.IPPrefix) bool {
var v4, v6 bool
for _, r := range rr {
if r == allIPv4 {
v4 = true
} else if r == allIPv6 {
v6 = true
}
}
return v4 && v6
}
var (
allIPv4 = netaddr.MustParseIPPrefix("0.0.0.0/0")
allIPv6 = netaddr.MustParseIPPrefix("::/0")
)
// AllIPv4 returns 0.0.0.0/0.
func AllIPv4() netaddr.IPPrefix { return allIPv4 }
// AllIPv6 returns ::/0.
func AllIPv6() netaddr.IPPrefix { return allIPv6 }