Moves to official vendoring solution

vendor/github.com/vishvananda/netlink/addr_linux.go

@@ -0,0 +1,128 @@
+package netlink
+
+import (
+	"fmt"
+	"net"
+	"strings"
+	"syscall"
+
+	"github.com/vishvananda/netlink/nl"
+)
+
+// AddrAdd will add an IP address to a link device.
+// Equivalent to: `ip addr add $addr dev $link`
+func AddrAdd(link Link, addr *Addr) error {
+
+	req := nl.NewNetlinkRequest(syscall.RTM_NEWADDR, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
+	return addrHandle(link, addr, req)
+}
+
+// AddrDel will delete an IP address from a link device.
+// Equivalent to: `ip addr del $addr dev $link`
+func AddrDel(link Link, addr *Addr) error {
+	req := nl.NewNetlinkRequest(syscall.RTM_DELADDR, syscall.NLM_F_ACK)
+	return addrHandle(link, addr, req)
+}
+
+func addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error {
+	base := link.Attrs()
+	if addr.Label != "" && !strings.HasPrefix(addr.Label, base.Name) {
+		return fmt.Errorf("label must begin with interface name")
+	}
+	ensureIndex(base)
+
+	family := nl.GetIPFamily(addr.IP)
+
+	msg := nl.NewIfAddrmsg(family)
+	msg.Index = uint32(base.Index)
+	prefixlen, _ := addr.Mask.Size()
+	msg.Prefixlen = uint8(prefixlen)
+	req.AddData(msg)
+
+	var addrData []byte
+	if family == FAMILY_V4 {
+		addrData = addr.IP.To4()
+	} else {
+		addrData = addr.IP.To16()
+	}
+
+	localData := nl.NewRtAttr(syscall.IFA_LOCAL, addrData)
+	req.AddData(localData)
+
+	addressData := nl.NewRtAttr(syscall.IFA_ADDRESS, addrData)
+	req.AddData(addressData)
+
+	if addr.Label != "" {
+		labelData := nl.NewRtAttr(syscall.IFA_LABEL, nl.ZeroTerminated(addr.Label))
+		req.AddData(labelData)
+	}
+
+	_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
+	return err
+}
+
+// AddrList gets a list of IP addresses in the system.
+// Equivalent to: `ip addr show`.
+// The list can be filtered by link and ip family.
+func AddrList(link Link, family int) ([]Addr, error) {
+	req := nl.NewNetlinkRequest(syscall.RTM_GETADDR, syscall.NLM_F_DUMP)
+	msg := nl.NewIfInfomsg(family)
+	req.AddData(msg)
+
+	msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWADDR)
+	if err != nil {
+		return nil, err
+	}
+
+	index := 0
+	if link != nil {
+		base := link.Attrs()
+		ensureIndex(base)
+		index = base.Index
+	}
+
+	var res []Addr
+	for _, m := range msgs {
+		msg := nl.DeserializeIfAddrmsg(m)
+
+		if link != nil && msg.Index != uint32(index) {
+			// Ignore messages from other interfaces
+			continue
+		}
+
+		attrs, err := nl.ParseRouteAttr(m[msg.Len():])
+		if err != nil {
+			return nil, err
+		}
+
+		var local, dst *net.IPNet
+		var addr Addr
+		for _, attr := range attrs {
+			switch attr.Attr.Type {
+			case syscall.IFA_ADDRESS:
+				dst = &net.IPNet{
+					IP:   attr.Value,
+					Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
+				}
+			case syscall.IFA_LOCAL:
+				local = &net.IPNet{
+					IP:   attr.Value,
+					Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
+				}
+			case syscall.IFA_LABEL:
+				addr.Label = string(attr.Value[:len(attr.Value)-1])
+			}
+		}
+
+		// IFA_LOCAL should be there but if not, fall back to IFA_ADDRESS
+		if local != nil {
+			addr.IPNet = local
+		} else {
+			addr.IPNet = dst
+		}
+
+		res = append(res, addr)
+	}
+
+	return res, nil
+}