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/firewall_linux.go

@@ -0,0 +1,55 @@
+package routemanager
+
+import (
+	"context"
+	"fmt"
+	"github.com/coreos/go-iptables/iptables"
+	log "github.com/sirupsen/logrus"
+)
+import "github.com/google/nftables"
+
+const (
+	ipv6Forwarding   = "netbird-rt-ipv6-forwarding"
+	ipv4Forwarding   = "netbird-rt-ipv4-forwarding"
+	ipv6Nat          = "netbird-rt-ipv6-nat"
+	ipv4Nat          = "netbird-rt-ipv4-nat"
+	natFormat        = "netbird-nat-%s"
+	forwardingFormat = "netbird-fwd-%s"
+	ipv6             = "ipv6"
+	ipv4             = "ipv4"
+)
+
+func genKey(format string, input string) string {
+	return fmt.Sprintf(format, input)
+}
+
+// NewFirewall if supported, returns an iptables manager, otherwise returns a nftables manager
+func NewFirewall(parentCTX context.Context) firewallManager {
+	ctx, cancel := context.WithCancel(parentCTX)
+
+	if isIptablesSupported() {
+		log.Debugf("iptables is supported")
+		ipv4Client, _ := iptables.NewWithProtocol(iptables.ProtocolIPv4)
+		ipv6Client, _ := iptables.NewWithProtocol(iptables.ProtocolIPv6)
+
+		return &iptablesManager{
+			ctx:        ctx,
+			stop:       cancel,
+			ipv4Client: ipv4Client,
+			ipv6Client: ipv6Client,
+			rules:      make(map[string]map[string][]string),
+		}
+	}
+
+	log.Debugf("iptables is not supported, using nftables")
+
+	manager := &nftablesManager{
+		ctx:    ctx,
+		stop:   cancel,
+		conn:   &nftables.Conn{},
+		chains: make(map[string]map[string]*nftables.Chain),
+		rules:  make(map[string]*nftables.Rule),
+	}
+
+	return manager
+}