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unix: support Linux NFC Subsystem

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This adds the constants and types needed for the Linux NFC Subsystem.
It also adds support for sockaddr_nfc and sockaddr_nfc_llcp to Connect.

The Linux NFC Subsystem is documented in:
https://www.kernel.org/doc/html/latest/networking/nfc.html.

Change-Id: Ic6a79afdba85e9b154ec46f191f27714b4b38a57
Reviewed-on: https://go-review.googlesource.com/c/sys/+/323551
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tom Thorogood
2021-06-03 12:58:02 +00:00
committed by Tobias Klauser
parent ebe580a85c
commit 9665404d36
31 changed files with 731 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files
unix/syscall_linux.go
+71
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@@ -904,6 +904,46 @@ func (sa *SockaddrIUCV) sockaddr() (unsafe.Pointer, _Socklen, error) {
return unsafe.Pointer(&sa.raw), SizeofSockaddrIUCV, nil
}
type SockaddrNFC struct {
DeviceIdx uint32
TargetIdx uint32
NFCProtocol uint32
raw RawSockaddrNFC
}
func (sa *SockaddrNFC) sockaddr() (unsafe.Pointer, _Socklen, error) {
sa.raw.Sa_family = AF_NFC
sa.raw.Dev_idx = sa.DeviceIdx
sa.raw.Target_idx = sa.TargetIdx
sa.raw.Nfc_protocol = sa.NFCProtocol
return unsafe.Pointer(&sa.raw), SizeofSockaddrNFC, nil
}
type SockaddrNFCLLCP struct {
DeviceIdx uint32
TargetIdx uint32
NFCProtocol uint32
DestinationSAP uint8
SourceSAP uint8
ServiceName string
raw RawSockaddrNFCLLCP
}
func (sa *SockaddrNFCLLCP) sockaddr() (unsafe.Pointer, _Socklen, error) {
sa.raw.Sa_family = AF_NFC
sa.raw.Dev_idx = sa.DeviceIdx
sa.raw.Target_idx = sa.TargetIdx
sa.raw.Nfc_protocol = sa.NFCProtocol
sa.raw.Dsap = sa.DestinationSAP
sa.raw.Ssap = sa.SourceSAP
if len(sa.ServiceName) > len(sa.raw.Service_name) {
return nil, 0, EINVAL
}
copy(sa.raw.Service_name[:], sa.ServiceName)
sa.raw.SetServiceNameLen(len(sa.ServiceName))
return unsafe.Pointer(&sa.raw), SizeofSockaddrNFCLLCP, nil
}
var socketProtocol = func(fd int) (int, error) {
return GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL)
}
@@ -1144,6 +1184,37 @@ func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
}
return sa, nil
}
case AF_NFC:
proto, err := socketProtocol(fd)
if err != nil {
return nil, err
}
switch proto {
case NFC_SOCKPROTO_RAW:
pp := (*RawSockaddrNFC)(unsafe.Pointer(rsa))
sa := &SockaddrNFC{
DeviceIdx: pp.Dev_idx,
TargetIdx: pp.Target_idx,
NFCProtocol: pp.Nfc_protocol,
}
return sa, nil
case NFC_SOCKPROTO_LLCP:
pp := (*RawSockaddrNFCLLCP)(unsafe.Pointer(rsa))
if uint64(pp.Service_name_len) > uint64(len(pp.Service_name)) {
return nil, EINVAL
}
sa := &SockaddrNFCLLCP{
DeviceIdx: pp.Dev_idx,
TargetIdx: pp.Target_idx,
NFCProtocol: pp.Nfc_protocol,
DestinationSAP: pp.Dsap,
SourceSAP: pp.Ssap,
ServiceName: string(pp.Service_name[:pp.Service_name_len]),
}
return sa, nil
default:
return nil, EINVAL
}
}
return nil, EAFNOSUPPORT
}