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Send NDP NA message upon assigning egress IP
Implement Neighbor Discovery Protocol(NDP) neighbor advertisement for Egress IPv6 support, once an IPv6 IP address has assigned to Node, an unsolicited Neighbor Advertisement ICMPv6 multicast packet will be sent, announcing the IP to all IPv6 nodes as per RFC4861. Signed-off-by: Wenqi Qiu <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| // Copyright 2021 Antrea Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // Package ndp contains functions to send NDP advertisement on Linux. | ||
| package ndp |
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| // Copyright 2021 Antrea Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package ndp | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "syscall" | ||
|
|
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| "golang.org/x/net/icmp" | ||
| "golang.org/x/net/ipv6" | ||
| utilnet "k8s.io/utils/net" | ||
| ) | ||
|
|
||
| const ( | ||
| // Option Length, 8-bit unsigned integer. The length of the option (including the type and length fields) in units of 8 octets. | ||
| // The value 0 is invalid. Nodes MUST silently discard a ND packet that contains an option with length zero. | ||
| // https://datatracker.ietf.org/doc/html/rfc4861 | ||
| ndpOptionLen = 1 | ||
|
|
||
| // ndpOptionType | ||
| // Option Name Type | ||
| // | ||
| // Source Link-Layer Address 1 | ||
| // Target Link-Layer Address 2 | ||
| // Prefix Information 3 | ||
| // Redirected Header 4 | ||
| // MTU 5 | ||
| ndpOptionType = 2 | ||
|
|
||
| // Minimum byte length values for each type of valid Message. | ||
| naLen = 20 | ||
|
|
||
| // Hop limit is always 255, refer RFC 4861. | ||
| hopLimit = 255 | ||
| ) | ||
|
|
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| // NeighborAdvertisement sends an unsolicited Neighbor Advertisement ICMPv6 multicast packet, | ||
| // over interface 'iface' from 'srcIP', announcing a given IPv6 address('srcIP') to all IPv6 nodes as per RFC4861. | ||
| func NeighborAdvertisement(srcIP net.IP, iface *net.Interface) error { | ||
| if !utilnet.IsIPv6(srcIP) { | ||
| return fmt.Errorf("invalid IPv6 address: %v", srcIP) | ||
| } | ||
|
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| mb, err := newNDPNeighborAdvertisementMessage(srcIP, iface.HardwareAddr) | ||
| if err != nil { | ||
| return fmt.Errorf("new NDP Neighbor Advertisement Message error: %v", err) | ||
| } | ||
|
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| sockInet6, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_RAW, syscall.IPPROTO_ICMPV6) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer syscall.Close(sockInet6) | ||
|
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| syscall.SetsockoptInt(sockInet6, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_HOPS, hopLimit) | ||
|
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| var r [16]byte | ||
| copy(r[:], net.IPv6linklocalallnodes.To16()) | ||
| toSockAddrInet6 := syscall.SockaddrInet6{Addr: r} | ||
| if err := syscall.Sendto(sockInet6, mb, 0, &toSockAddrInet6); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
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| func newNDPNeighborAdvertisementMessage(targetAddress net.IP, hwa net.HardwareAddr) ([]byte, error) { | ||
| naMsgBytes := make([]byte, naLen) | ||
| naMsgBytes[0] |= 1 << 5 | ||
| copy(naMsgBytes[4:], targetAddress) | ||
|
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| if 1+1+len(hwa) != int(ndpOptionLen*8) { | ||
| return nil, fmt.Errorf("hardwareAddr length error: %s", hwa) | ||
| } | ||
| optionsBytes := make([]byte, ndpOptionLen*8) | ||
| optionsBytes[0] = ndpOptionType | ||
| optionsBytes[1] = ndpOptionLen | ||
| copy(optionsBytes[2:], hwa) | ||
| naMsgBytes = append(naMsgBytes, optionsBytes...) | ||
|
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| im := icmp.Message{ | ||
| // ICMPType = 136, Neighbor Advertisement | ||
| Type: ipv6.ICMPTypeNeighborAdvertisement, | ||
| // Always zero. | ||
| Code: 0, | ||
| // The ICMP checksum. Calculated by caller or OS. | ||
| Checksum: 0, | ||
| Body: &icmp.RawBody{ | ||
| Data: naMsgBytes, | ||
| }, | ||
| } | ||
| return im.Marshal(nil) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| // Copyright 2021 Antrea Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package ndp | ||
|
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||
| import ( | ||
| "net" | ||
| "testing" | ||
|
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| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
|
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| "antrea.io/antrea/pkg/util/ip" | ||
| ) | ||
|
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| func TestAdvertiserMarshalMessage(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| ipv6Addr string | ||
| hardwareAddr net.HardwareAddr | ||
| want []byte | ||
| }{ | ||
| { | ||
| name: "NDP neighbor advertise marshalMessage", | ||
| ipv6Addr: "fe80::250:56ff:fea7:e29d", | ||
| hardwareAddr: net.HardwareAddr{0x00, 0x50, 0x56, 0xa7, 0xe2, 0x9d}, | ||
| // Neighbor Advertisement Message Format | ||
| // 0 1 2 3 | ||
| // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | ||
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
| // | Type | Code | Checksum | | ||
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
| // |R|S|O| Reserved | | ||
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
| // | | | ||
| // + + | ||
| // | | | ||
| // + Target Address + | ||
| // | | | ||
| // + + | ||
| // | | | ||
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
| // | Options ... | ||
| // +-+-+-+-+-+-+-+-+-+-+-+- | ||
| want: []byte{ | ||
| 0x88, 0x0, 0x0, 0x0, | ||
| 0x20, 0x0, 0x0, 0x0, | ||
| 0xfe, 0x80, 0x0, 0x0, | ||
| 0x0, 0x0, 0x0, 0x0, | ||
| 0x2, 0x50, 0x56, 0xff, | ||
| 0xfe, 0xa7, 0xe2, 0x9d, | ||
| 0x2, 0x1, 0x0, 0x50, | ||
| 0x56, 0xa7, 0xe2, 0x9d, | ||
| }, | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| got, err := newNDPNeighborAdvertisementMessage(ip.MustIPv6(tt.ipv6Addr), tt.hardwareAddr) | ||
| require.NoError(t, err) | ||
| assert.Equal(t, tt.want, got) | ||
| }) | ||
| } | ||
| } |
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