vendor: add d2g/dhcp4server

vendor/golang.org/x/net/ipv4/sys_linux.go

@@ -0,0 +1,55 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv4
+
+import (
+	"net"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	ctlOpts = [ctlMax]ctlOpt{
+		ctlTTL:        {sysIP_TTL, 1, marshalTTL, parseTTL},
+		ctlPacketInfo: {sysIP_PKTINFO, sysSizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
+	}
+
+	sockOpts = [ssoMax]sockOpt{
+		ssoTOS:                {sysIP_TOS, ssoTypeInt},
+		ssoTTL:                {sysIP_TTL, ssoTypeInt},
+		ssoMulticastTTL:       {sysIP_MULTICAST_TTL, ssoTypeInt},
+		ssoMulticastInterface: {sysIP_MULTICAST_IF, ssoTypeIPMreqn},
+		ssoMulticastLoopback:  {sysIP_MULTICAST_LOOP, ssoTypeInt},
+		ssoReceiveTTL:         {sysIP_RECVTTL, ssoTypeInt},
+		ssoPacketInfo:         {sysIP_PKTINFO, ssoTypeInt},
+		ssoHeaderPrepend:      {sysIP_HDRINCL, ssoTypeInt},
+		ssoICMPFilter:         {sysICMP_FILTER, ssoTypeICMPFilter},
+		ssoJoinGroup:          {sysMCAST_JOIN_GROUP, ssoTypeGroupReq},
+		ssoLeaveGroup:         {sysMCAST_LEAVE_GROUP, ssoTypeGroupReq},
+		ssoJoinSourceGroup:    {sysMCAST_JOIN_SOURCE_GROUP, ssoTypeGroupSourceReq},
+		ssoLeaveSourceGroup:   {sysMCAST_LEAVE_SOURCE_GROUP, ssoTypeGroupSourceReq},
+		ssoBlockSourceGroup:   {sysMCAST_BLOCK_SOURCE, ssoTypeGroupSourceReq},
+		ssoUnblockSourceGroup: {sysMCAST_UNBLOCK_SOURCE, ssoTypeGroupSourceReq},
+	}
+)
+
+func (pi *sysInetPktinfo) setIfindex(i int) {
+	pi.Ifindex = int32(i)
+}
+
+func (gr *sysGroupReq) setGroup(grp net.IP) {
+	sa := (*sysSockaddrInet)(unsafe.Pointer(&gr.Group))
+	sa.Family = syscall.AF_INET
+	copy(sa.Addr[:], grp)
+}
+
+func (gsr *sysGroupSourceReq) setSourceGroup(grp, src net.IP) {
+	sa := (*sysSockaddrInet)(unsafe.Pointer(&gsr.Group))
+	sa.Family = syscall.AF_INET
+	copy(sa.Addr[:], grp)
+	sa = (*sysSockaddrInet)(unsafe.Pointer(&gsr.Source))
+	sa.Family = syscall.AF_INET
+	copy(sa.Addr[:], src)
+}