Add app source, add vendoring and module support

vendor/github.com/osrg/gobgp/pkg/server/sockopt_bsd.go

@@ -0,0 +1,69 @@
+// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+// implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// +build dragonfly freebsd netbsd
+
+package server
+
+import (
+	"net"
+	"syscall"
+)
+
+const (
+	TCP_MD5SIG       = 0x10 // TCP MD5 Signature (RFC2385)
+	IPV6_MINHOPCOUNT = 73   // Generalized TTL Security Mechanism (RFC5082)
+)
+
+func setTcpMD5SigSockopt(l *net.TCPListener, address string, key string) error {
+	sc, err := l.SyscallConn()
+	if err != nil {
+		return err
+	}
+	// always enable and assumes that the configuration is done by setkey()
+	return setsockOptInt(sc, syscall.IPPROTO_TCP, TCP_MD5SIG, 1)
+}
+
+func setListenTcpTTLSockopt(l *net.TCPListener, ttl int) error {
+	family := extractFamilyFromTCPListener(l)
+	sc, err := l.SyscallConn()
+	if err != nil {
+		return err
+	}
+	return setsockoptIpTtl(sc, family, ttl)
+}
+
+func setTcpTTLSockopt(conn *net.TCPConn, ttl int) error {
+	family := extractFamilyFromTCPConn(conn)
+	sc, err := conn.SyscallConn()
+	if err != nil {
+		return err
+	}
+	return setsockoptIpTtl(sc, family, ttl)
+}
+
+func setTcpMinTTLSockopt(conn *net.TCPConn, ttl int) error {
+	family := extractFamilyFromTCPConn(conn)
+	sc, err := conn.SyscallConn()
+	if err != nil {
+		return err
+	}
+	level := syscall.IPPROTO_IP
+	name := syscall.IP_MINTTL
+	if family == syscall.AF_INET6 {
+		level = syscall.IPPROTO_IPV6
+		name = IPV6_MINHOPCOUNT
+	}
+	return setsockOptInt(sc, level, name, ttl)
+}