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net/interfaces: handle removed interfaces in State.Equal

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This wasn't previously handling the case where an interface in s2 was
removed and not present in s1, and would cause the Equal method to
incorrectly return that the states were equal.

Updates tailscale/corp#19124

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I3af22bc631015d1ddd0a1d01bfdf312161b9532d
This commit is contained in:
Andrew Dunham 2024-04-16 16:06:13 -04:00
parent 454a03a766
commit 226486eb9a
2 changed files with 37 additions and 0 deletions
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7
net/interfaces/interfaces.go
View File

@ -343,6 +343,13 @@ func (s *State) Equal(s2 *State) bool {
s.PAC != s2.PAC {
return false
}
// If s2 has more interfaces than s, it's not equal.
if len(s.Interface) != len(s2.Interface) || len(s.InterfaceIPs) != len(s2.InterfaceIPs) {
return false
}
// Now that we know that both states have the same number of
// interfaces, we can check each interface in s against s2. If it's not
// present or not exactly equal, then the states are not equal.
for iname, i := range s.Interface {
i2, ok := s2.Interface[iname]
if !ok {

30
net/interfaces/interfaces_test.go
View File

@ -286,6 +286,13 @@ func TestStateString(t *testing.T) {
// tests (*State).Equal
func TestEqual(t *testing.T) {
pfxs := func(addrs ...string) (ret []netip.Prefix) {
for _, addr := range addrs {
ret = append(ret, netip.MustParsePrefix(addr))
}
return ret
}
tests := []struct {
name string
s1, s2 *State
@ -362,6 +369,29 @@ func TestEqual(t *testing.T) {
},
want: false,
},
// See tailscale/corp#19124
{
name: "interface-removed",
s1: &State{
InterfaceIPs: map[string][]netip.Prefix{
"rmnet16": pfxs("2607:1111:2222:3333:4444:5555:6666:7777/64"),
"rmnet17": pfxs("2607:9999:8888:7777:666:5555:4444:3333/64"),
"tun0": pfxs("100.64.1.2/32", "fd7a:115c:a1e0::1/128"),
"v4-rmnet16": pfxs("192.0.0.4/32"),
"wlan0": pfxs("10.0.0.111/24"), // removed below
},
},
s2: &State{
InterfaceIPs: map[string][]netip.Prefix{
"rmnet16": pfxs("2607:1111:2222:3333:4444:5555:6666:7777/64"),
"rmnet17": pfxs("2607:9999:8888:7777:666:5555:4444:3333/64"),
"tun0": pfxs("100.64.1.2/32", "fd7a:115c:a1e0::1/128"),
"v4-rmnet16": pfxs("192.0.0.4/32"),
},
},
want: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {