Add routing peer support (#441)

Handle routes updates from management

Manage routing firewall rules

Manage peer RIB table

Add get peer and get notification channel from the status recorder

Update interface peers allowed IPs

client/internal/routemanager/systemops_linux.go

@@ -0,0 +1,73 @@
+package routemanager
+
+import (
+	"github.com/vishvananda/netlink"
+	"io/ioutil"
+	"net"
+	"net/netip"
+)
+
+const ipv4ForwardingPath = "/proc/sys/net/ipv4/ip_forward"
+
+func addToRouteTable(prefix netip.Prefix, addr string) error {
+	_, ipNet, err := net.ParseCIDR(prefix.String())
+	if err != nil {
+		return err
+	}
+
+	addrMask := "/32"
+	if prefix.Addr().Unmap().Is6() {
+		addrMask = "/128"
+	}
+
+	ip, _, err := net.ParseCIDR(addr + addrMask)
+	if err != nil {
+		return err
+	}
+
+	route := &netlink.Route{
+		Scope: netlink.SCOPE_UNIVERSE,
+		Dst:   ipNet,
+		Gw:    ip,
+	}
+
+	err = netlink.RouteAdd(route)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func removeFromRouteTable(prefix netip.Prefix) error {
+	_, ipNet, err := net.ParseCIDR(prefix.String())
+	if err != nil {
+		return err
+	}
+
+	route := &netlink.Route{
+		Scope: netlink.SCOPE_UNIVERSE,
+		Dst:   ipNet,
+	}
+
+	err = netlink.RouteDel(route)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func enableIPForwarding() error {
+	err := ioutil.WriteFile(ipv4ForwardingPath, []byte("1"), 0644)
+	return err
+}
+
+func isNetForwardHistoryEnabled() bool {
+	out, err := ioutil.ReadFile(ipv4ForwardingPath)
+	if err != nil {
+		// todo
+		panic(err)
+	}
+	return string(out) == "1"
+}