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76 lines
3.4 KiB
76 lines
3.4 KiB
// Copyright 2014 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package ipv4 |
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import ( |
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"net" |
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"runtime" |
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"strings" |
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"syscall" |
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"unsafe" |
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"golang.org/x/net/internal/iana" |
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"golang.org/x/net/internal/socket" |
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) |
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var ( |
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ctlOpts = [ctlMax]ctlOpt{ |
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ctlTTL: {sysIP_RECVTTL, 1, marshalTTL, parseTTL}, |
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ctlDst: {sysIP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst}, |
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ctlInterface: {sysIP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface}, |
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} |
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sockOpts = map[int]*sockOpt{ |
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ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}}, |
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ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}}, |
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ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 1}}, |
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ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}}, |
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ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}}, |
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ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVTTL, Len: 4}}, |
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ssoReceiveDst: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVDSTADDR, Len: 4}}, |
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ssoReceiveInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVIF, Len: 4}}, |
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ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}}, |
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ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, |
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ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, |
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ssoJoinSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
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ssoLeaveSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
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ssoBlockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
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ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, |
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} |
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) |
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func init() { |
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freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate") |
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if freebsdVersion >= 1000000 { |
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sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn} |
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} |
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if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" { |
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archs, _ := syscall.Sysctl("kern.supported_archs") |
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for _, s := range strings.Fields(archs) { |
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if s == "amd64" { |
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freebsd32o64 = true |
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break |
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} |
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} |
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} |
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} |
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func (gr *groupReq) setGroup(grp net.IP) { |
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sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group)) |
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sa.Len = sizeofSockaddrInet |
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sa.Family = syscall.AF_INET |
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copy(sa.Addr[:], grp) |
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} |
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func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) { |
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sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group)) |
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sa.Len = sizeofSockaddrInet |
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sa.Family = syscall.AF_INET |
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copy(sa.Addr[:], grp) |
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sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source)) |
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sa.Len = sizeofSockaddrInet |
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sa.Family = syscall.AF_INET |
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copy(sa.Addr[:], src) |
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}
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