cwinfo/yggdrasil-go
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Split create_icmpv6 into create_icmpv6_tun and create_icmpv6_tap

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This commit is contained in:
Neil Alexander 2018-02-14 11:39:55 +00:00
parent d78e0f7067
commit 0bf43b758f
1 changed files with 24 additions and 2 deletions
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26
src/yggdrasil/icmpv6.go
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@ -129,7 +129,7 @@ func (i *icmpv6) parse_packet_tun(datain []byte) ([]byte, error) {
response, err := i.handle_ndp(datain[ipv6.HeaderLen:])
if err == nil {
// Create our ICMPv6 response
responsePacket, err := i.create_icmpv6(ipv6Header.Src, ipv6.ICMPTypeNeighborAdvertisement, 0, response)
responsePacket, err := i.create_icmpv6_tun(ipv6Header.Src, ipv6.ICMPTypeNeighborAdvertisement, 0, response)
if err != nil {
return nil, err
}
@ -148,7 +148,27 @@ func (i *icmpv6) parse_packet_tun(datain []byte) ([]byte, error) {
return nil, nil
}
func (i *icmpv6) create_icmpv6(dst net.IP, mtype ipv6.ICMPType, mcode int, mbody []byte) ([]byte, error) {
func (i *icmpv6) create_icmpv6_tap(dstmac macAddress, dst net.IP, mtype ipv6.ICMPType, mcode int, mbody []byte) ([]byte, error) {
// Pass through to create_icmpv6_tun
ipv6packet, err := i.create_icmpv6_tun(dst, mtype, mcode, mbody)
if err != nil {
return nil, err
}
// Create the response buffer
dataout := make([]byte, ETHER+ipv6.HeaderLen+len(mbody))
// Populate the response ethernet headers
copy(dataout[:6], dstmac[:6])
copy(dataout[6:12], i.mymac[:])
binary.BigEndian.PutUint16(dataout[12:14], uint16(0x86DD))
// Copy the returned packet to our response ethernet frame
copy(dataout[ETHER:], ipv6packet)
return dataout, nil
}
func (i *icmpv6) create_icmpv6_tun(dst net.IP, mtype ipv6.ICMPType, mcode int, mbody []byte) ([]byte, error) {
// Create the IPv6 header
ipv6Header := ipv6.Header{
Version: ipv6.Version,
@ -187,6 +207,8 @@ func (i *icmpv6) create_icmpv6(dst net.IP, mtype ipv6.ICMPType, mcode int, mbody
return responsePacket, nil
}
func (i *icmpv6) handle_ndp(in []byte) ([]byte, error) {
// Ignore NDP requests for anything outside of fd00::/8
if in[8] != 0xFD {