David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2014 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package ipv4 |
| 6 | |
| 7 | import ( |
| 8 | "net" |
| 9 | "runtime" |
| 10 | "strings" |
| 11 | "syscall" |
| 12 | "unsafe" |
| 13 | |
| 14 | "golang.org/x/net/internal/iana" |
| 15 | "golang.org/x/net/internal/socket" |
| 16 | ) |
| 17 | |
| 18 | var ( |
| 19 | ctlOpts = [ctlMax]ctlOpt{ |
| 20 | ctlTTL: {sysIP_RECVTTL, 1, marshalTTL, parseTTL}, |
| 21 | ctlDst: {sysIP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst}, |
| 22 | ctlInterface: {sysIP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface}, |
| 23 | } |
| 24 | |
| 25 | sockOpts = map[int]*sockOpt{ |
| 26 | ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}}, |
| 27 | ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}}, |
| 28 | ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 1}}, |
| 29 | ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}}, |
| 30 | ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}}, |
| 31 | ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVTTL, Len: 4}}, |
| 32 | ssoReceiveDst: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVDSTADDR, Len: 4}}, |
| 33 | ssoReceiveInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVIF, Len: 4}}, |
| 34 | ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}}, |
| 35 | ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, |
| 36 | ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, |
| 37 | ssoJoinSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| 38 | ssoLeaveSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| 39 | ssoBlockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| 40 | ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
| 41 | } |
| 42 | ) |
| 43 | |
| 44 | func init() { |
| 45 | freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate") |
| 46 | if freebsdVersion >= 1000000 { |
| 47 | sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn} |
| 48 | } |
| 49 | if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" { |
| 50 | archs, _ := syscall.Sysctl("kern.supported_archs") |
| 51 | for _, s := range strings.Fields(archs) { |
| 52 | if s == "amd64" { |
| 53 | freebsd32o64 = true |
| 54 | break |
| 55 | } |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | func (gr *groupReq) setGroup(grp net.IP) { |
| 61 | sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group)) |
| 62 | sa.Len = sizeofSockaddrInet |
| 63 | sa.Family = syscall.AF_INET |
| 64 | copy(sa.Addr[:], grp) |
| 65 | } |
| 66 | |
| 67 | func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) { |
| 68 | sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group)) |
| 69 | sa.Len = sizeofSockaddrInet |
| 70 | sa.Family = syscall.AF_INET |
| 71 | copy(sa.Addr[:], grp) |
| 72 | sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source)) |
| 73 | sa.Len = sizeofSockaddrInet |
| 74 | sa.Family = syscall.AF_INET |
| 75 | copy(sa.Addr[:], src) |
| 76 | } |