daemon: use per-interface features

Signed-off-by: Steffen Vogel <post@steffenvogel.de>

pkg/daemon/feature/rtsync/handlers.go

@@ -0,0 +1,74 @@
+package rtsync
+
+import (
+	"errors"
+	"net"
+	"net/netip"
+	"syscall"
+
+	"github.com/stv0g/cunicu/pkg/core"
+	"go.uber.org/zap"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+func (rs *Interface) OnPeerAdded(p *core.Peer) {
+	pk := p.PublicKey()
+	gwV4, ok1 := netip.AddrFromSlice(pk.IPv4Address().IP)
+	gwV6, ok2 := netip.AddrFromSlice(pk.IPv6Address().IP)
+	if !ok1 || !ok2 {
+		panic("failed to get address from slice")
+	}
+
+	rs.gwMap[gwV4] = p
+	rs.gwMap[gwV6] = p
+
+	rs.syncKernel() // Initial sync
+
+	p.OnModified(rs)
+}
+
+func (rs *Interface) OnPeerRemoved(p *core.Peer) {
+	pk := p.PublicKey()
+	gwV4, ok1 := netip.AddrFromSlice(pk.IPv4Address().IP)
+	gwV6, ok2 := netip.AddrFromSlice(pk.IPv6Address().IP)
+	if !ok1 || !ok2 {
+		panic("failed to get address from slice")
+	}
+
+	delete(rs.gwMap, gwV4)
+	delete(rs.gwMap, gwV6)
+
+	if err := rs.removeKernel(p); err != nil {
+		rs.logger.Error("Failed to remove kernel routes for peer",
+			zap.Error(err),
+			zap.Any("intf", p.Interface),
+			zap.Any("peer", p),
+		)
+	}
+}
+
+func (rs *Interface) OnPeerModified(p *core.Peer, old *wgtypes.Peer, m core.PeerModifier, ipsAdded, ipsRemoved []net.IPNet) {
+	for _, dst := range ipsAdded {
+		if err := p.Interface.KernelDevice.AddRoute(dst, rs.Settings.RouteSync.Table); err != nil {
+			rs.logger.Error("Failed to add route", zap.Error(err))
+			continue
+		}
+
+		rs.logger.Info("Added new AllowedIP to kernel routing table",
+			zap.Any("dst", dst),
+			zap.Any("intf", p.Interface),
+			zap.Any("peer", p))
+	}
+
+	for _, dst := range ipsRemoved {
+		if err := p.Interface.KernelDevice.DeleteRoute(dst, rs.Settings.RouteSync.Table); err != nil && !errors.Is(err, syscall.ESRCH) {
+			rs.logger.Error("Failed to delete route", zap.Error(err))
+			continue
+		}
+
+		rs.logger.Info("Remove vanished AllowedIP from kernel routing table",
+			zap.Any("dst", dst),
+			zap.Any("intf", p.Interface),
+			zap.Any("peer", p))
+	}
+}