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net.go
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net.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package egressgateway
import (
"fmt"
"net/netip"
"github.com/vishvananda/netlink"
"go4.org/netipx"
)
func getIfaceFirstIPv4Address(ifaceName string) (netip.Addr, error) {
dev, err := netlink.LinkByName(ifaceName)
if err != nil {
return netip.Addr{}, err
}
addrs, err := netlink.AddrList(dev, netlink.FAMILY_V4)
if err != nil {
return netip.Addr{}, err
}
for _, addr := range addrs {
if addr.IP.To4() != nil {
a, ok := netipx.FromStdIP(addr.IP)
if !ok {
continue
}
return a, nil
}
}
return netip.Addr{}, fmt.Errorf("no IPv4 address assigned to interface")
}
func getIfaceWithIPv4Address(ip netip.Addr) (string, error) {
links, err := netlink.LinkList()
if err != nil {
return "", err
}
for _, l := range links {
addrs, err := netlink.AddrList(l, netlink.FAMILY_V4)
if err != nil {
return "", err
}
for _, addr := range addrs {
a, ok := netipx.FromStdIP(addr.IP)
if !ok {
continue
}
if a == ip {
return l.Attrs().Name, nil
}
}
}
return "", fmt.Errorf("no interface with %s IPv4 assigned to", ip)
}