From 1d517b6ca50236057fff090c7803f88dd1f813d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Tue, 29 Oct 2024 15:28:58 +0800
Subject: [PATCH] platform: Add link flags

---
 experimental/libbox/link_flags_linux.go | 30 +++++++++++++++++++++++++
 experimental/libbox/link_flags_stub.go  | 11 +++++++++
 experimental/libbox/platform.go         |  1 +
 experimental/libbox/service.go          |  1 +
 4 files changed, 43 insertions(+)
 create mode 100644 experimental/libbox/link_flags_linux.go
 create mode 100644 experimental/libbox/link_flags_stub.go

diff --git a/experimental/libbox/link_flags_linux.go b/experimental/libbox/link_flags_linux.go
new file mode 100644
index 00000000..aa9ad46d
--- /dev/null
+++ b/experimental/libbox/link_flags_linux.go
@@ -0,0 +1,30 @@
+package libbox
+
+import (
+	"net"
+	"syscall"
+)
+
+// copied from net.linkFlags
+func linkFlags(rawFlags uint32) net.Flags {
+	var f net.Flags
+	if rawFlags&syscall.IFF_UP != 0 {
+		f |= net.FlagUp
+	}
+	if rawFlags&syscall.IFF_RUNNING != 0 {
+		f |= net.FlagRunning
+	}
+	if rawFlags&syscall.IFF_BROADCAST != 0 {
+		f |= net.FlagBroadcast
+	}
+	if rawFlags&syscall.IFF_LOOPBACK != 0 {
+		f |= net.FlagLoopback
+	}
+	if rawFlags&syscall.IFF_POINTOPOINT != 0 {
+		f |= net.FlagPointToPoint
+	}
+	if rawFlags&syscall.IFF_MULTICAST != 0 {
+		f |= net.FlagMulticast
+	}
+	return f
+}
diff --git a/experimental/libbox/link_flags_stub.go b/experimental/libbox/link_flags_stub.go
new file mode 100644
index 00000000..306754f3
--- /dev/null
+++ b/experimental/libbox/link_flags_stub.go
@@ -0,0 +1,11 @@
+//go:build !linux
+
+package libbox
+
+import (
+	"net"
+)
+
+func linkFlags(rawFlags uint32) net.Flags {
+	panic("stub!")
+}
diff --git a/experimental/libbox/platform.go b/experimental/libbox/platform.go
index 4078140f..e2bf8e8e 100644
--- a/experimental/libbox/platform.go
+++ b/experimental/libbox/platform.go
@@ -38,6 +38,7 @@ type NetworkInterface struct {
 	MTU       int32
 	Name      string
 	Addresses StringIterator
+	Flags     int32
 }
 
 type WIFIState struct {
diff --git a/experimental/libbox/service.go b/experimental/libbox/service.go
index 7e2e1414..53ca168c 100644
--- a/experimental/libbox/service.go
+++ b/experimental/libbox/service.go
@@ -181,6 +181,7 @@ func (w *platformInterfaceWrapper) Interfaces() ([]control.Interface, error) {
 			MTU:       int(netInterface.MTU),
 			Name:      netInterface.Name,
 			Addresses: common.Map(iteratorToArray[string](netInterface.Addresses), netip.MustParsePrefix),
+			Flags:     linkFlags(uint32(netInterface.Flags)),
 		})
 	}
 	return interfaces, nil