github.com/binkynet/BinkyNet@v1.12.1-0.20240421190447-da4e34c20be0/proto_vendor/golang.org/x/net/ipv4/sys_linux.go (about)

     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  	"syscall"
    10  	"unsafe"
    11  
    12  	"golang.org/x/net/internal/iana"
    13  	"golang.org/x/net/internal/socket"
    14  	"golang.org/x/sys/unix"
    15  )
    16  
    17  var (
    18  	ctlOpts = [ctlMax]ctlOpt{
    19  		ctlTTL:        {sysIP_TTL, 1, marshalTTL, parseTTL},
    20  		ctlPacketInfo: {sysIP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
    21  	}
    22  
    23  	sockOpts = map[int]*sockOpt{
    24  		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}},
    25  		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}},
    26  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 4}},
    27  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn},
    28  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}},
    29  		ssoReceiveTTL:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVTTL, Len: 4}},
    30  		ssoPacketInfo:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_PKTINFO, Len: 4}},
    31  		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}},
    32  		ssoICMPFilter:         {Option: socket.Option{Level: iana.ProtocolReserved, Name: sysICMP_FILTER, Len: sizeofICMPFilter}},
    33  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    34  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    35  		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    36  		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    37  		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    38  		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    39  		ssoAttachFilter:       {Option: socket.Option{Level: unix.SOL_SOCKET, Name: unix.SO_ATTACH_FILTER, Len: unix.SizeofSockFprog}},
    40  	}
    41  )
    42  
    43  func (pi *inetPktinfo) setIfindex(i int) {
    44  	pi.Ifindex = int32(i)
    45  }
    46  
    47  func (gr *groupReq) setGroup(grp net.IP) {
    48  	sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group))
    49  	sa.Family = syscall.AF_INET
    50  	copy(sa.Addr[:], grp)
    51  }
    52  
    53  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
    54  	sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group))
    55  	sa.Family = syscall.AF_INET
    56  	copy(sa.Addr[:], grp)
    57  	sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source))
    58  	sa.Family = syscall.AF_INET
    59  	copy(sa.Addr[:], src)
    60  }