Add support for rule's handle, position and id (#33)
This commit is contained in:
Serguei Bezverkhi
Michael Stapelberg
parent
7a68526274
commit
7c0b8e78d4
148
nftables_test.go
148
nftables_test.go
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@ -624,6 +624,154 @@ func TestTProxy(t *testing.T) {
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}
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}
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func TestAddRuleWithPosition(t *testing.T) {
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want := [][]byte{
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// batch begin
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[]byte("\x00\x00\x00\x0a"),
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// nft add rule ip ipv4table ipv4chain-1 position 2 ip version 6
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[]byte("\x02\x00\x00\x00\x0e\x00\x01\x00\x69\x70\x76\x34\x74\x61\x62\x6c\x65\x00\x00\x00\x10\x00\x02\x00\x69\x70\x76\x34\x63\x68\x61\x69\x6e\x2d\x31\x00\xa8\x00\x04\x80\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x00\x08\x00\x04\x00\x00\x00\x00\x01\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x01\x0c\x00\x04\x80\x05\x00\x01\x00\xf0\x00\x00\x00\x0c\x00\x05\x80\x05\x00\x01\x00\x00\x00\x00\x00\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x05\x00\x01\x00\x60\x00\x00\x00\x0c\x00\x06\x00\x00\x00\x00\x00\x00\x00\x00\x02"),
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// batch end
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[]byte("\x00\x00\x00\x0a"),
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}
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c := &nftables.Conn{
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TestDial: func(req []netlink.Message) ([]netlink.Message, error) {
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for idx, msg := range req {
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b, err := msg.MarshalBinary()
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if err != nil {
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t.Fatal(err)
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}
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if len(b) < 16 {
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continue
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}
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b = b[16:]
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if len(want) == 0 {
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t.Errorf("no want entry for message %d: %x", idx, b)
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continue
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}
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if got, want := b, want[0]; !bytes.Equal(got, want) {
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t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
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}
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want = want[1:]
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}
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return req, nil
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},
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}
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c.AddRule(&nftables.Rule{
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Position: 2,
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Table: &nftables.Table{Name: "ipv4table", Family: nftables.TableFamilyIPv4},
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Chain: &nftables.Chain{
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Name: "ipv4chain-1",
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Type: nftables.ChainTypeFilter,
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Hooknum: nftables.ChainHookPrerouting,
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Priority: 0,
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},
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Exprs: []expr.Any{
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// [ payload load 1b @ network header + 0 => reg 1 ]
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&expr.Payload{
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DestRegister: 1,
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Base: expr.PayloadBaseNetworkHeader,
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Offset: 0, // Offset for a transport protocol header
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Len: 1, // 1 bytes for port
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},
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// [ bitwise reg 1 = (reg=1 & 0x000000f0 ) ^ 0x00000000 ]
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&expr.Bitwise{
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SourceRegister: 1,
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DestRegister: 1,
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Len: 1,
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Mask: []byte{0xf0},
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Xor: []byte{0x0},
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},
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// [ cmp eq reg 1 0x00000060 ]
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&expr.Cmp{
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Op: expr.CmpOpEq,
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Register: 1,
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Data: []byte{(0x6 << 4)},
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},
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},
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})
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if err := c.Flush(); err != nil {
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t.Fatal(err)
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}
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}
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func TestAddRuleRuleID(t *testing.T) {
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want := [][]byte{
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// batch begin
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[]byte("\x00\x00\x00\x0a"),
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// nft add rule ip ipv4table ipv4chain-1 ip version 6 comment \0x01
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[]byte("\x02\x00\x00\x00\x0e\x00\x01\x00\x69\x70\x76\x34\x74\x61\x62\x6c\x65\x00\x00\x00\x10\x00\x02\x00\x69\x70\x76\x34\x63\x68\x61\x69\x6e\x2d\x31\x00\xa8\x00\x04\x80\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x00\x08\x00\x04\x00\x00\x00\x00\x01\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x01\x0c\x00\x04\x80\x05\x00\x01\x00\xf0\x00\x00\x00\x0c\x00\x05\x80\x05\x00\x01\x00\x00\x00\x00\x00\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x05\x00\x01\x00\x60\x00\x00\x00\x08\x00\x07\x00\x00\x00\x00\x01"),
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// batch end
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[]byte("\x00\x00\x00\x0a"),
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}
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c := &nftables.Conn{
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TestDial: func(req []netlink.Message) ([]netlink.Message, error) {
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for idx, msg := range req {
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b, err := msg.MarshalBinary()
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if err != nil {
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t.Fatal(err)
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}
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if len(b) < 16 {
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continue
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}
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b = b[16:]
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if len(want) == 0 {
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t.Errorf("no want entry for message %d: %x", idx, b)
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continue
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}
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if got, want := b, want[0]; !bytes.Equal(got, want) {
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t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
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}
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want = want[1:]
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}
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return req, nil
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},
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}
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c.AddRule(&nftables.Rule{
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RuleID: 1,
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Table: &nftables.Table{Name: "ipv4table", Family: nftables.TableFamilyIPv4},
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Chain: &nftables.Chain{
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Name: "ipv4chain-1",
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Type: nftables.ChainTypeFilter,
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Hooknum: nftables.ChainHookPrerouting,
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Priority: 0,
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},
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Exprs: []expr.Any{
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// [ payload load 1b @ network header + 0 => reg 1 ]
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&expr.Payload{
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DestRegister: 1,
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Base: expr.PayloadBaseNetworkHeader,
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Offset: 0, // Offset for a transport protocol header
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Len: 1, // 1 bytes for port
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},
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// [ bitwise reg 1 = (reg=1 & 0x000000f0 ) ^ 0x00000000 ]
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&expr.Bitwise{
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SourceRegister: 1,
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DestRegister: 1,
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Len: 1,
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Mask: []byte{0xf0},
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Xor: []byte{0x0},
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},
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// [ cmp eq reg 1 0x00000060 ]
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&expr.Cmp{
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Op: expr.CmpOpEq,
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Register: 1,
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Data: []byte{(0x6 << 4)},
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},
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},
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})
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if err := c.Flush(); err != nil {
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t.Fatal(err)
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}
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}
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func TestAddChain(t *testing.T) {
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tests := []struct {
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name string
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89
rule.go
89
rule.go
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@ -18,6 +18,7 @@ import (
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"encoding/binary"
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"fmt"
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"github.com/google/nftables/binaryutil"
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"github.com/google/nftables/expr"
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"github.com/mdlayher/netlink"
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"golang.org/x/sys/unix"
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@ -28,9 +29,12 @@ var ruleHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.
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// A Rule does something with a packet. See also
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// https://wiki.nftables.org/wiki-nftables/index.php/Simple_rule_management
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type Rule struct {
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Table *Table
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Chain *Chain
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Exprs []expr.Any
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Table *Table
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Chain *Chain
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RuleID uint32
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Position uint64
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Handle uint64
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Exprs []expr.Any
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}
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// GetRule returns the rules in the specified table and chain.
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@ -52,7 +56,7 @@ func (cc *Conn) GetRule(t *Table, c *Chain) ([]*Rule, error) {
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message := netlink.Message{
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Header: netlink.Header{
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Type: netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_GETRULE),
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Flags: netlink.Request | netlink.Acknowledge | netlink.Dump,
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Flags: netlink.Request | netlink.Acknowledge | netlink.Dump | unix.NLM_F_ECHO,
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},
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Data: append(extraHeader(uint8(t.Family), 0), data...),
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}
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@ -77,8 +81,51 @@ func (cc *Conn) GetRule(t *Table, c *Chain) ([]*Rule, error) {
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return rules, nil
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}
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// AddRule adds the specified Rule. See also
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// https://wiki.nftables.org/wiki-nftables/index.php/Simple_rule_management
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// GetRuleHandle returns a specific rule's handle. Rule is identified by Table, Chain and RuleID.
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func (cc *Conn) GetRuleHandle(t *Table, c *Chain, ruleID uint32) (uint64, error) {
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conn, err := cc.dialNetlink()
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if err != nil {
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return 0, err
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}
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defer conn.Close()
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if ruleID == 0 {
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return 0, fmt.Errorf("rule's id cannot be 0")
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}
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data, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_RULE_TABLE, Data: []byte(t.Name + "\x00")},
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{Type: unix.NFTA_RULE_CHAIN, Data: []byte(c.Name + "\x00")},
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{Type: unix.NFTA_RULE_USERDATA, Data: binaryutil.BigEndian.PutUint32(ruleID)},
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})
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if err != nil {
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return 0, err
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}
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message := netlink.Message{
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Header: netlink.Header{
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Type: netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_GETRULE),
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Flags: netlink.Request | netlink.Acknowledge | netlink.Dump | unix.NLM_F_ECHO,
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},
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Data: append(extraHeader(uint8(t.Family), 0), data...),
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}
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if _, err := conn.SendMessages([]netlink.Message{message}); err != nil {
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return 0, fmt.Errorf("SendMessages: %v", err)
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}
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reply, err := conn.Receive()
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if err != nil {
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return 0, fmt.Errorf("Receive: %v", err)
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}
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if len(reply) != 1 {
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return 0, fmt.Errorf("Receive: Expected 1 message but got %d", len(reply))
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}
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rr, err := ruleFromMsg(reply[0])
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if err != nil {
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return 0, err
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}
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return rr.Handle, nil
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}
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// AddRule adds the specified Rule
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func (cc *Conn) AddRule(r *Rule) *Rule {
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exprAttrs := make([]netlink.Attribute, len(r.Exprs))
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for idx, expr := range r.Exprs {
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@ -87,19 +134,35 @@ func (cc *Conn) AddRule(r *Rule) *Rule {
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Data: cc.marshalExpr(expr),
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}
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}
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data := cc.marshalAttr([]netlink.Attribute{
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{Type: unix.NFTA_RULE_TABLE, Data: []byte(r.Table.Name + "\x00")},
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{Type: unix.NFTA_RULE_CHAIN, Data: []byte(r.Chain.Name + "\x00")},
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{Type: unix.NLA_F_NESTED | unix.NFTA_RULE_EXPRESSIONS, Data: cc.marshalAttr(exprAttrs)},
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})
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msgData := []byte{}
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msgData = append(msgData, data...)
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var flags netlink.HeaderFlags
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if r.RuleID != 0 {
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msgData = append(msgData, cc.marshalAttr([]netlink.Attribute{
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{Type: unix.NFTA_RULE_USERDATA, Data: binaryutil.BigEndian.PutUint32(r.RuleID)},
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})...)
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}
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if r.Position != 0 {
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msgData = append(msgData, cc.marshalAttr([]netlink.Attribute{
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{Type: unix.NFTA_RULE_POSITION, Data: binaryutil.BigEndian.PutUint64(r.Position)},
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})...)
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// when a rule's position is specified, it becomes nft insert rule operation
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flags = netlink.Request | netlink.Acknowledge | netlink.Create | unix.NLM_F_ECHO
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} else {
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// unix.NLM_F_APPEND is added when nft add rule operation is executed.
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flags = netlink.Request | netlink.Acknowledge | netlink.Create | unix.NLM_F_ECHO | unix.NLM_F_APPEND
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}
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cc.messages = append(cc.messages, netlink.Message{
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Header: netlink.Header{
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Type: ruleHeaderType,
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Flags: netlink.Request | netlink.Acknowledge | netlink.Create,
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Flags: flags,
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},
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Data: append(extraHeader(uint8(r.Table.Family), 0), data...),
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Data: append(extraHeader(uint8(r.Table.Family), 0), msgData...),
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})
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return r
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@ -191,6 +254,12 @@ func ruleFromMsg(msg netlink.Message) (*Rule, error) {
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r.Exprs, err = exprsFromMsg(b)
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return err
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})
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case unix.NFTA_RULE_POSITION:
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r.Position = ad.Uint64()
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case unix.NFTA_RULE_HANDLE:
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r.Handle = ad.Uint64()
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case unix.NFTA_RULE_USERDATA:
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r.RuleID = ad.Uint32()
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}
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}
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return &r, ad.Err()
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