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net/interfaces: skip IPv6 link-local interfaces like we do for IPv4

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We strip them control-side anyway, and we already strip IPv4 link
local, so there's no point uploading them.  And iOS has a ton of them,
which results in somewhat silly amount of traffic in the MapRequest.

We'll be doing same-LAN-inter-tailscaled link-local traffic a
different way, with same-LAN discovery.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-03-16 12:20:44 -07:00 committed by Brad Fitzpatrick
parent 469613b4c5
commit d5fd373f09
1 changed files with 6 additions and 7 deletions
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13
net/interfaces/interfaces.go
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@ -113,7 +113,7 @@ func LocalAddresses() (regular, loopback []netaddr.IP, err error) {
if tsaddr.IsTailscaleIP(ip) {
continue
}
if linkLocalIPv4.Contains(ip) {
if ip.IsLinkLocalUnicast() {
continue
}
if ip.IsLoopback() || ifcIsLoopback {
@ -483,12 +483,11 @@ func mustCIDR(s string) netaddr.IPPrefix {
}
var (
private1 = mustCIDR("10.0.0.0/8")
private2 = mustCIDR("172.16.0.0/12")
private3 = mustCIDR("192.168.0.0/16")
privatev4s = []netaddr.IPPrefix{private1, private2, private3}
linkLocalIPv4 = mustCIDR("169.254.0.0/16")
v6Global1 = mustCIDR("2000::/3")
private1 = mustCIDR("10.0.0.0/8")
private2 = mustCIDR("172.16.0.0/12")
private3 = mustCIDR("192.168.0.0/16")
privatev4s = []netaddr.IPPrefix{private1, private2, private3}
v6Global1 = mustCIDR("2000::/3")
)
// anyInterestingIP reports whether pfxs contains any IP that matches