unix: add functions to get/set tpacket socket options

Add GetsockoptTpacketStats and GetsockoptTpacketStatsV3 to get tpacket
statistics (for TPACKET_V2 and TPACKET_V3).

Add SetsockoptTpacketReq and SetsockoptTpacketReq3 to set up tpacket
v2/v3 ring buffers.

Change-Id: Ic2870be22be7d74141f682e515a682df28e1c814
Reviewed-on: https://go-review.googlesource.com/c/sys/+/165558
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/linux/types.go

@@ -1115,6 +1115,9 @@ const (
 	SizeofTpacketHdr  = C.sizeof_struct_tpacket_hdr
 	SizeofTpacket2Hdr = C.sizeof_struct_tpacket2_hdr
 	SizeofTpacket3Hdr = C.sizeof_struct_tpacket3_hdr
+
+	SizeofTpacketStats   = C.sizeof_struct_tpacket_stats
+	SizeofTpacketStatsV3 = C.sizeof_struct_tpacket_stats_v3
 )
 
 // netfilter

unix/syscall_linux.go

@@ -1004,6 +1004,20 @@ func GetsockoptString(fd, level, opt int) (string, error) {
 	return string(buf[:vallen-1]), nil
 }
 
+func GetsockoptTpacketStats(fd, level, opt int) (*TpacketStats, error) {
+	var value TpacketStats
+	vallen := _Socklen(SizeofTpacketStats)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+	return &value, err
+}
+
+func GetsockoptTpacketStatsV3(fd, level, opt int) (*TpacketStatsV3, error) {
+	var value TpacketStatsV3
+	vallen := _Socklen(SizeofTpacketStatsV3)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+	return &value, err
+}
+
 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
 	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
 }
@@ -1022,6 +1036,14 @@ func SetsockoptCanRawFilter(fd, level, opt int, filter []CanFilter) error {
 	return setsockopt(fd, level, opt, p, uintptr(len(filter)*SizeofCanFilter))
 }
 
+func SetsockoptTpacketReq(fd, level, opt int, tp *TpacketReq) error {
+	return setsockopt(fd, level, opt, unsafe.Pointer(tp), unsafe.Sizeof(*tp))
+}
+
+func SetsockoptTpacketReq3(fd, level, opt int, tp *TpacketReq3) error {
+	return setsockopt(fd, level, opt, unsafe.Pointer(tp), unsafe.Sizeof(*tp))
+}
+
 // Keyctl Commands (http://man7.org/linux/man-pages/man2/keyctl.2.html)
 
 // KeyctlInt calls keyctl commands in which each argument is an int.

unix/ztypes_linux_386.go

@@ -1428,6 +1428,9 @@ const (
 	SizeofTpacketHdr  = 0x18
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_amd64.go

@@ -1440,6 +1440,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_arm.go

@@ -1418,6 +1418,9 @@ const (
 	SizeofTpacketHdr  = 0x18
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_arm64.go

@@ -1419,6 +1419,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_mips.go

@@ -1424,6 +1424,9 @@ const (
 	SizeofTpacketHdr  = 0x18
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_mips64.go

@@ -1421,6 +1421,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_mips64le.go

@@ -1421,6 +1421,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_mipsle.go

@@ -1424,6 +1424,9 @@ const (
 	SizeofTpacketHdr  = 0x18
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_ppc64.go

@@ -1429,6 +1429,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_ppc64le.go

@@ -1429,6 +1429,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_riscv64.go

@@ -1446,6 +1446,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_s390x.go

@@ -1443,6 +1443,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (

unix/ztypes_linux_sparc64.go

@@ -1424,6 +1424,9 @@ const (
 	SizeofTpacketHdr  = 0x20
 	SizeofTpacket2Hdr = 0x20
 	SizeofTpacket3Hdr = 0x30
+
+	SizeofTpacketStats   = 0x8
+	SizeofTpacketStatsV3 = 0xc
 )
 
 const (