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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux && !android
package netmon
import (
"net"
"net/netip"
"testing"
"github.com/jsimonetti/rtnetlink"
"github.com/mdlayher/netlink"
"golang.org/x/sys/unix"
)
func newAddrMsg(iface uint32, addr string, typ netlink.HeaderType) netlink.Message {
ip := net.ParseIP(addr)
if ip == nil {
panic("newAddrMsg: invalid addr: " + addr)
}
addrMsg := rtnetlink.AddressMessage{
Index: iface,
Attributes: &rtnetlink.AddressAttributes{
Address: ip,
},
}
b, err := addrMsg.MarshalBinary()
if err != nil {
panic(err)
}
return netlink.Message{
Header: netlink.Header{Type: typ},
Data: b,
}
}
// See issue #4282 and nlConn.addrCache.
func TestIgnoreDuplicateNEWADDR(t *testing.T) {
mustReceive := func(c *nlConn) message {
msg, err := c.Receive()
if err != nil {
t.Fatalf("mustReceive: unwanted error: %s", err)
}
return msg
}
t.Run("suppress duplicate NEWADDRs", func(t *testing.T) {
c := nlConn{
buffered: []netlink.Message{
newAddrMsg(1, "192.168.0.5", unix.RTM_NEWADDR),
newAddrMsg(1, "192.168.0.5", unix.RTM_NEWADDR),
},
addrCache: make(map[uint32]map[netip.Addr]bool),
}
msg := mustReceive(&c)
if _, ok := msg.(*newAddrMessage); !ok {
t.Fatalf("want newAddrMessage, got %T %v", msg, msg)
}
msg = mustReceive(&c)
if _, ok := msg.(ignoreMessage); !ok {
t.Fatalf("want ignoreMessage, got %T %v", msg, msg)
}
})
t.Run("do not suppress after DELADDR", func(t *testing.T) {
c := nlConn{
buffered: []netlink.Message{
newAddrMsg(1, "192.168.0.5", unix.RTM_NEWADDR),
newAddrMsg(1, "192.168.0.5", unix.RTM_DELADDR),
newAddrMsg(1, "192.168.0.5", unix.RTM_NEWADDR),
},
addrCache: make(map[uint32]map[netip.Addr]bool),
}
msg := mustReceive(&c)
if _, ok := msg.(*newAddrMessage); !ok {
t.Fatalf("want newAddrMessage, got %T %v", msg, msg)
}
msg = mustReceive(&c)
if m, ok := msg.(*newAddrMessage); !ok {
t.Fatalf("want newAddrMessage, got %T %v", msg, msg)
} else {
if !m.Delete {
t.Fatalf("want delete, got %#v", m)
}
}
msg = mustReceive(&c)
if _, ok := msg.(*newAddrMessage); !ok {
t.Fatalf("want newAddrMessage, got %T %v", msg, msg)
}
})
}
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