[release-branch.go1.12] syscall: on AIX use nsendmsg and nrecvmsg, define SockaddrDatalink

This commit changes sendmsg, recvmsg to use nsendmsg, nrecvmsg on AIX.
These syscalls support the new msghdr structure (with Control
and Controllen) which is needed for golang.org/x/net.
Also define SockaddrDataLink.

Fixes #33982

Change-Id: I233fbd24f9eb86648e0d4d50c2b56da3626292d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/170537
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
(cherry picked from commit e014184c)
Reviewed-on: https://go-review.googlesource.com/c/go/+/193608Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/syscall/syscall_aix.go

@@ -217,8 +217,11 @@ func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int,
 //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
 //sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
 //sys	Shutdown(s int, how int) (err error)
-//sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
-//sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
+
+// In order to use msghdr structure with Control, Controllen in golang.org/x/net,
+// nrecvmsg and nsendmsg must be used.
+//sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error) = nrecvmsg
+//sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error) = nsendmsg
 
 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
 	if sa.Port < 0 || sa.Port > 0xFFFF {
@@ -434,6 +437,18 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
 	return nil, EAFNOSUPPORT
 }
 
+type SockaddrDatalink struct {
+	Len    uint8
+	Family uint8
+	Index  uint16
+	Type   uint8
+	Nlen   uint8
+	Alen   uint8
+	Slen   uint8
+	Data   [120]uint8
+	raw    RawSockaddrDatalink
+}
+
 /*
  * Wait
  */

src/syscall/types_aix.go

@@ -23,6 +23,7 @@ package syscall
 #include <sys/statfs.h>
 
 #include <net/if.h>
+#include <net/if_dl.h>
 #include <netinet/in.h>
 #include <netinet/icmp6.h>
 
@@ -112,6 +113,8 @@ type RawSockaddrInet6 C.struct_sockaddr_in6
 
 type RawSockaddrUnix C.struct_sockaddr_un
 
+type RawSockaddrDatalink C.struct_sockaddr_dl
+
 type RawSockaddr C.struct_sockaddr
 
 type RawSockaddrAny C.struct_sockaddr_any
@@ -137,6 +140,7 @@ const (
 	SizeofSockaddrInet6    = C.sizeof_struct_sockaddr_in6
 	SizeofSockaddrAny      = C.sizeof_struct_sockaddr_any
 	SizeofSockaddrUnix     = C.sizeof_struct_sockaddr_un
+	SizeofSockaddrDatalink = C.sizeof_struct_sockaddr_dl
 	SizeofLinger           = C.sizeof_struct_linger
 	SizeofIPMreq           = C.sizeof_struct_ip_mreq
 	SizeofIPv6Mreq         = C.sizeof_struct_ipv6_mreq

src/syscall/zsyscall_aix_ppc64.go

@@ -32,8 +32,8 @@ import "unsafe"
 //go:cgo_import_dynamic libc_recvfrom recvfrom "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_sendto sendto "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_Shutdown shutdown "libc.a/shr_64.o"
-//go:cgo_import_dynamic libc_recvmsg recvmsg "libc.a/shr_64.o"
-//go:cgo_import_dynamic libc_sendmsg sendmsg "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_nrecvmsg nrecvmsg "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_nsendmsg nsendmsg "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_accept accept "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_Openat openat "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_ptrace64 ptrace64 "libc.a/shr_64.o"
@@ -120,8 +120,8 @@ import "unsafe"
 //go:linkname libc_recvfrom libc_recvfrom
 //go:linkname libc_sendto libc_sendto
 //go:linkname libc_Shutdown libc_Shutdown
-//go:linkname libc_recvmsg libc_recvmsg
-//go:linkname libc_sendmsg libc_sendmsg
+//go:linkname libc_nrecvmsg libc_nrecvmsg
+//go:linkname libc_nsendmsg libc_nsendmsg
 //go:linkname libc_accept libc_accept
 //go:linkname libc_Openat libc_Openat
 //go:linkname libc_ptrace64 libc_ptrace64
@@ -211,8 +211,8 @@ var (
 	libc_recvfrom,
 	libc_sendto,
 	libc_Shutdown,
-	libc_recvmsg,
-	libc_sendmsg,
+	libc_nrecvmsg,
+	libc_nsendmsg,
 	libc_accept,
 	libc_Openat,
 	libc_ptrace64,
@@ -573,7 +573,7 @@ func Shutdown(s int, how int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) {
-	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_recvmsg)), 3, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
+	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_nrecvmsg)), 3, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
 	n = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
@@ -584,7 +584,7 @@ func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) {
-	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_sendmsg)), 3, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
+	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_nsendmsg)), 3, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
 	n = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)

src/syscall/ztypes_aix_ppc64.go

@@ -168,6 +168,17 @@ type RawSockaddrUnix struct {
 	Path   [1023]uint8
 }
 
+type RawSockaddrDatalink struct {
+	Len    uint8
+	Family uint8
+	Index  uint16
+	Type   uint8
+	Nlen   uint8
+	Alen   uint8
+	Slen   uint8
+	Data   [120]uint8
+}
+
 type RawSockaddr struct {
 	Len    uint8
 	Family uint8
@@ -228,6 +239,7 @@ const (
 	SizeofSockaddrInet6    = 0x1c
 	SizeofSockaddrAny      = 0x404
 	SizeofSockaddrUnix     = 0x401
+	SizeofSockaddrDatalink = 0x80
 	SizeofLinger           = 0x8
 	SizeofIPMreq           = 0x8
 	SizeofIPv6Mreq         = 0x14