From 42f1d92ae020cf44f10be1a51b0059b46a21478b Mon Sep 17 00:00:00 2001
From: Denton Gentry <dgentry@tailscale.com>
Date: Sat, 17 Sep 2022 22:48:49 -0700
Subject: [PATCH] net/netns: implement UseSocketMark for Android.

Build fails on Android:
`../../../../go/pkg/mod/tailscale.com@v1.1.1-0.20220916223019-65c24b6334e9/wgengine/magicsock/magicsock_linux.go:133:12: undefined: netns.UseSocketMark`

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
---
 net/netns/netns_android.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/netns/netns_android.go b/net/netns/netns_android.go
index dad3358d8..9b28e924e 100644
--- a/net/netns/netns_android.go
+++ b/net/netns/netns_android.go
@@ -20,6 +20,11 @@ var (
 	androidProtectFunc   func(fd int) error
 )
 
+// UseSocketMark reports whether SO_MARK is in use. Android does not use SO_MARK.
+func UseSocketMark() bool {
+	return false
+}
+
 // SetAndroidProtectFunc register a func that Android provides that JNI calls into
 // https://developer.android.com/reference/android/net/VpnService#protect(int)
 // which is documented as: