Update dependencies

vendor/github.com/google/nftables/expr/match.go

@@ -0,0 +1,75 @@
+package expr
+
+import (
+	"bytes"
+	"encoding/binary"
+
+	"github.com/google/nftables/binaryutil"
+	"github.com/google/nftables/xt"
+	"github.com/mdlayher/netlink"
+	"golang.org/x/sys/unix"
+)
+
+// See https://git.netfilter.org/libnftnl/tree/src/expr/match.c?id=09456c720e9c00eecc08e41ac6b7c291b3821ee5#n30
+type Match struct {
+	Name string
+	Rev  uint32
+	Info xt.InfoAny
+}
+
+func (e *Match) marshal(fam byte) ([]byte, error) {
+	// Per https://git.netfilter.org/libnftnl/tree/src/expr/match.c?id=09456c720e9c00eecc08e41ac6b7c291b3821ee5#n38
+	name := e.Name
+	// limit the extension name as (some) user-space tools do and leave room for
+	// trailing \x00
+	if len(name) >= /* sic! */ XTablesExtensionNameMaxLen {
+		name = name[:XTablesExtensionNameMaxLen-1] // leave room for trailing \x00.
+	}
+	// Marshalling assumes that the correct Info type for the particular table
+	// family and Match revision has been set.
+	info, err := xt.Marshal(xt.TableFamily(fam), e.Rev, e.Info)
+	if err != nil {
+		return nil, err
+	}
+	attrs := []netlink.Attribute{
+		{Type: unix.NFTA_MATCH_NAME, Data: []byte(name + "\x00")},
+		{Type: unix.NFTA_MATCH_REV, Data: binaryutil.BigEndian.PutUint32(e.Rev)},
+		{Type: unix.NFTA_MATCH_INFO, Data: info},
+	}
+	data, err := netlink.MarshalAttributes(attrs)
+	if err != nil {
+		return nil, err
+	}
+
+	return netlink.MarshalAttributes([]netlink.Attribute{
+		{Type: unix.NFTA_EXPR_NAME, Data: []byte("match\x00")},
+		{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
+	})
+}
+
+func (e *Match) unmarshal(fam byte, data []byte) error {
+	// Per https://git.netfilter.org/libnftnl/tree/src/expr/match.c?id=09456c720e9c00eecc08e41ac6b7c291b3821ee5#n65
+	ad, err := netlink.NewAttributeDecoder(data)
+	if err != nil {
+		return err
+	}
+
+	var info []byte
+	ad.ByteOrder = binary.BigEndian
+	for ad.Next() {
+		switch ad.Type() {
+		case unix.NFTA_MATCH_NAME:
+			// We are forgiving here, accepting any length and even missing terminating \x00.
+			e.Name = string(bytes.TrimRight(ad.Bytes(), "\x00"))
+		case unix.NFTA_MATCH_REV:
+			e.Rev = ad.Uint32()
+		case unix.NFTA_MATCH_INFO:
+			info = ad.Bytes()
+		}
+	}
+	if err = ad.Err(); err != nil {
+		return err
+	}
+	e.Info, err = xt.Unmarshal(e.Name, xt.TableFamily(fam), e.Rev, info)
+	return err
+}