| // 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" |
| "runtime" |
| "strings" |
| "syscall" |
| "unsafe" |
| |
| "golang.org/x/net/internal/iana" |
| "golang.org/x/net/internal/socket" |
| |
| "golang.org/x/sys/unix" |
| ) |
| |
| var ( |
| ctlOpts = [ctlMax]ctlOpt{ |
| ctlTTL: {unix.IP_RECVTTL, 1, marshalTTL, parseTTL}, |
| ctlDst: {unix.IP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst}, |
| ctlInterface: {unix.IP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface}, |
| } |
| |
| sockOpts = map[int]*sockOpt{ |
| ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TOS, Len: 4}}, |
| ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TTL, Len: 4}}, |
| ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 1}}, |
| ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: 4}}, |
| ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 4}}, |
| ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVTTL, Len: 4}}, |
| ssoReceiveDst: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVDSTADDR, Len: 4}}, |
| ssoReceiveInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVIF, Len: 4}}, |
| ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_HDRINCL, Len: 4}}, |
| ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, |
| ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, |
| ssoJoinSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| ssoLeaveSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| ssoBlockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| } |
| ) |
| |
| func init() { |
| freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate") |
| if freebsdVersion >= 1000000 { |
| sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn} |
| } |
| if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" { |
| archs, _ := syscall.Sysctl("kern.supported_archs") |
| for _, s := range strings.Fields(archs) { |
| if s == "amd64" { |
| compatFreeBSD32 = true |
| break |
| } |
| } |
| } |
| } |
| |
| func (gr *groupReq) setGroup(grp net.IP) { |
| sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group)) |
| sa.Len = sizeofSockaddrInet |
| sa.Family = syscall.AF_INET |
| copy(sa.Addr[:], grp) |
| } |
| |
| func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) { |
| sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group)) |
| sa.Len = sizeofSockaddrInet |
| sa.Family = syscall.AF_INET |
| copy(sa.Addr[:], grp) |
| sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source)) |
| sa.Len = sizeofSockaddrInet |
| sa.Family = syscall.AF_INET |
| copy(sa.Addr[:], src) |
| } |