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|
package libnetwork
import (
"context"
"fmt"
"strings"
"testing"
"github.com/docker/docker/internal/testutils/netnsutils"
"github.com/docker/docker/libnetwork/config"
"github.com/docker/docker/libnetwork/drivers/bridge"
"github.com/docker/docker/libnetwork/internal/nftables"
"github.com/docker/docker/libnetwork/iptables"
"github.com/docker/docker/libnetwork/netlabel"
"github.com/docker/docker/libnetwork/options"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
"gotest.tools/v3/golden"
"gotest.tools/v3/icmd"
"gotest.tools/v3/skip"
)
const (
fwdChainName = "FORWARD"
usrChainName = userChain
)
func TestUserChain(t *testing.T) {
iptable4 := iptables.GetIptable(iptables.IPv4)
iptable6 := iptables.GetIptable(iptables.IPv6)
res := icmd.RunCommand("iptables", "--version")
assert.NilError(t, res.Error)
noChainErr := "No chain/target/match by that name"
if strings.Contains(res.Combined(), "nf_tables") {
// For a non-existent chain, iptables-nft "-S <chain>" reports:
// ip6tables v1.8.9 (nf_tables): chain `<chain>' in table `filter' is incompatible, use 'nft' tool.
noChainErr = "incompatible, use 'nft' tool"
}
tests := []struct {
iptables bool
append bool // append other rules to FORWARD
}{
{
iptables: true,
append: false,
},
{
iptables: true,
append: true,
},
{
iptables: false,
append: false,
},
}
for _, tc := range tests {
t.Run(fmt.Sprintf("iptables=%v,append=%v", tc.iptables, tc.append), func(t *testing.T) {
defer netnsutils.SetupTestOSContext(t)()
defer resetIptables(t)
c, err := New(
context.Background(),
config.OptionDataDir(t.TempDir()),
config.OptionDriverConfig("bridge", map[string]any{
netlabel.GenericData: options.Generic{
"EnableIPTables": tc.iptables,
"EnableIP6Tables": tc.iptables,
},
}))
assert.NilError(t, err)
defer c.Stop()
skip.If(t, nftables.Enabled(), "nftables is enabled, skipping iptables test")
// init. condition
golden.Assert(t, getRules(t, iptable4, fwdChainName),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_fwdinit4", tc.iptables, tc.append))
golden.Assert(t, getRules(t, iptable6, fwdChainName),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_fwdinit6", tc.iptables, tc.append))
if tc.iptables {
golden.Assert(t, getRules(t, iptable4, bridge.DockerForwardChain),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_dockerfwdinit4", tc.iptables, tc.append))
golden.Assert(t, getRules(t, iptable6, bridge.DockerForwardChain),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_dockerfwdinit6", tc.iptables, tc.append))
} else {
assert.Check(t, !iptables.GetIptable(iptables.IPv4).ExistChain(bridge.DockerForwardChain, fwdChainName),
"Chain %s should not exist", bridge.DockerForwardChain)
}
if tc.append {
_, err := iptable4.Raw("-A", fwdChainName, "-j", "DROP")
assert.Check(t, err)
_, err = iptable6.Raw("-A", fwdChainName, "-j", "DROP")
assert.Check(t, err)
}
c.setupUserChains()
golden.Assert(t, getRules(t, iptable4, fwdChainName),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_fwdafter4", tc.iptables, tc.append))
golden.Assert(t, getRules(t, iptable6, fwdChainName),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_fwdafter6", tc.iptables, tc.append))
if tc.iptables {
golden.Assert(t, getRules(t, iptable4, bridge.DockerForwardChain),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_dockerfwdafter4", tc.iptables, tc.append))
golden.Assert(t, getRules(t, iptable6, bridge.DockerForwardChain),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_dockerfwdafter6", tc.iptables, tc.append))
} else {
assert.Check(t, !iptables.GetIptable(iptables.IPv4).ExistChain(bridge.DockerForwardChain, fwdChainName),
"Chain %s should not exist", bridge.DockerForwardChain)
}
if tc.iptables {
golden.Assert(t, getRules(t, iptable4, usrChainName),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_usrafter4", tc.iptables, tc.append))
golden.Assert(t, getRules(t, iptable6, usrChainName),
fmt.Sprintf("TestUserChain_iptables-%v_append-%v_usrafter6", tc.iptables, tc.append))
} else {
_, err := iptable4.Raw("-S", usrChainName)
assert.Check(t, is.ErrorContains(err, noChainErr), "ipv4 chain %v: created unexpectedly", usrChainName)
_, err = iptable6.Raw("-S", usrChainName)
assert.Check(t, is.ErrorContains(err, noChainErr), "ipv6 chain %v: created unexpectedly", usrChainName)
}
})
}
}
func getRules(t *testing.T, iptable *iptables.IPTable, chain string) string {
t.Helper()
output, err := iptable.Raw("-S", chain)
assert.NilError(t, err, "chain %s: failed to get rules", chain)
return string(output)
}
func resetIptables(t *testing.T) {
t.Helper()
for _, ipVer := range []iptables.IPVersion{iptables.IPv4, iptables.IPv6} {
iptable := iptables.GetIptable(ipVer)
_, err := iptable.Raw("-F", fwdChainName)
assert.Check(t, err)
_ = iptable.RemoveExistingChain(usrChainName, iptables.Filter)
}
}
|
