/usr/share/gocode/src/github.com/vishvananda/netlink/neigh_linux.go is in golang-github-vishvananda-netlink-dev 0.0~git20150820.0.1e2e08e-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | package netlink
import (
"net"
"syscall"
"unsafe"
"github.com/vishvananda/netlink/nl"
)
const (
NDA_UNSPEC = iota
NDA_DST
NDA_LLADDR
NDA_CACHEINFO
NDA_PROBES
NDA_VLAN
NDA_PORT
NDA_VNI
NDA_IFINDEX
NDA_MAX = NDA_IFINDEX
)
// Neighbor Cache Entry States.
const (
NUD_NONE = 0x00
NUD_INCOMPLETE = 0x01
NUD_REACHABLE = 0x02
NUD_STALE = 0x04
NUD_DELAY = 0x08
NUD_PROBE = 0x10
NUD_FAILED = 0x20
NUD_NOARP = 0x40
NUD_PERMANENT = 0x80
)
// Neighbor Flags
const (
NTF_USE = 0x01
NTF_SELF = 0x02
NTF_MASTER = 0x04
NTF_PROXY = 0x08
NTF_ROUTER = 0x80
)
type Ndmsg struct {
Family uint8
Index uint32
State uint16
Flags uint8
Type uint8
}
func deserializeNdmsg(b []byte) *Ndmsg {
var dummy Ndmsg
return (*Ndmsg)(unsafe.Pointer(&b[0:unsafe.Sizeof(dummy)][0]))
}
func (msg *Ndmsg) Serialize() []byte {
return (*(*[unsafe.Sizeof(*msg)]byte)(unsafe.Pointer(msg)))[:]
}
func (msg *Ndmsg) Len() int {
return int(unsafe.Sizeof(*msg))
}
// NeighAdd will add an IP to MAC mapping to the ARP table
// Equivalent to: `ip neigh add ....`
func NeighAdd(neigh *Neigh) error {
return neighAdd(neigh, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL)
}
// NeighAdd will add or replace an IP to MAC mapping to the ARP table
// Equivalent to: `ip neigh replace....`
func NeighSet(neigh *Neigh) error {
return neighAdd(neigh, syscall.NLM_F_CREATE)
}
// NeighAppend will append an entry to FDB
// Equivalent to: `bridge fdb append...`
func NeighAppend(neigh *Neigh) error {
return neighAdd(neigh, syscall.NLM_F_CREATE|syscall.NLM_F_APPEND)
}
func neighAdd(neigh *Neigh, mode int) error {
req := nl.NewNetlinkRequest(syscall.RTM_NEWNEIGH, mode|syscall.NLM_F_ACK)
return neighHandle(neigh, req)
}
// NeighDel will delete an IP address from a link device.
// Equivalent to: `ip addr del $addr dev $link`
func NeighDel(neigh *Neigh) error {
req := nl.NewNetlinkRequest(syscall.RTM_DELNEIGH, syscall.NLM_F_ACK)
return neighHandle(neigh, req)
}
func neighHandle(neigh *Neigh, req *nl.NetlinkRequest) error {
var family int
if neigh.Family > 0 {
family = neigh.Family
} else {
family = nl.GetIPFamily(neigh.IP)
}
msg := Ndmsg{
Family: uint8(family),
Index: uint32(neigh.LinkIndex),
State: uint16(neigh.State),
Type: uint8(neigh.Type),
Flags: uint8(neigh.Flags),
}
req.AddData(&msg)
ipData := neigh.IP.To4()
if ipData == nil {
ipData = neigh.IP.To16()
}
dstData := nl.NewRtAttr(NDA_DST, ipData)
req.AddData(dstData)
hwData := nl.NewRtAttr(NDA_LLADDR, []byte(neigh.HardwareAddr))
req.AddData(hwData)
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
return err
}
// NeighList gets a list of IP-MAC mappings in the system (ARP table).
// Equivalent to: `ip neighbor show`.
// The list can be filtered by link and ip family.
func NeighList(linkIndex, family int) ([]Neigh, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETNEIGH, syscall.NLM_F_DUMP)
msg := Ndmsg{
Family: uint8(family),
}
req.AddData(&msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWNEIGH)
if err != nil {
return nil, err
}
var res []Neigh
for _, m := range msgs {
ndm := deserializeNdmsg(m)
if linkIndex != 0 && int(ndm.Index) != linkIndex {
// Ignore messages from other interfaces
continue
}
neigh, err := NeighDeserialize(m)
if err != nil {
continue
}
res = append(res, *neigh)
}
return res, nil
}
func NeighDeserialize(m []byte) (*Neigh, error) {
msg := deserializeNdmsg(m)
neigh := Neigh{
LinkIndex: int(msg.Index),
Family: int(msg.Family),
State: int(msg.State),
Type: int(msg.Type),
Flags: int(msg.Flags),
}
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case NDA_DST:
neigh.IP = net.IP(attr.Value)
case NDA_LLADDR:
neigh.HardwareAddr = net.HardwareAddr(attr.Value)
}
}
return &neigh, nil
}
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