net: add AIX operating system

This commit adds AIX operating system to net package for ppc64
architecture.

Updates: #25893

Change-Id: I46bbc7b03931019beb969443cb3f9a756956c66c
Reviewed-on: https://go-review.googlesource.com/c/138724
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/addrselect.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 // Minimal RFC 6724 address selection.
 

src/net/conf.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/dial_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/dnsclient_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 // DNS client: see RFC 1035.
 // Has to be linked into package net for Dial.

src/net/dnsclient_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/dnsconfig_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 // Read system DNS config from /etc/resolv.conf
 

src/net/dnsconfig_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/error_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package net
 

src/net/error_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js linux netbsd openbsd solaris
 
 package net
 

src/net/fd_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris
 
 package net
 

src/net/file_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/hook_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package net
 

src/net/interface_aix.go

@@ -0,0 +1,165 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	//"os"
+	"syscall"
+	"unsafe"
+)
+
+type RawSockaddrDatalink struct {
+	Len    uint8
+	Family uint8
+	Index  uint16
+	Type   uint8
+	Nlen   uint8
+	Alen   uint8
+	Slen   uint8
+	Data   [120]byte
+}
+
+const _KINFO_RT_IFLIST = (0x1 << 8) | 3 | (1 << 30)
+
+const _RTAX_NETMASK = 2
+const _RTAX_IFA = 5
+const _RTAX_MAX = 8
+
+func getIfList() ([]byte, error) {
+	needed, err := syscall.Getkerninfo(_KINFO_RT_IFLIST, 0, 0, 0)
+	if err != nil {
+		return nil, nil // XXX
+	}
+	tab := make([]byte, needed)
+	_, err = syscall.Getkerninfo(_KINFO_RT_IFLIST, uintptr(unsafe.Pointer(&tab[0])), uintptr(unsafe.Pointer(&needed)), 0)
+	if err != nil {
+		return nil, nil // XXX
+	}
+	return tab[:needed], nil
+}
+
+// If the ifindex is zero, interfaceTable returns mappings of all
+// network interfaces. Otherwise it returns a mapping of a specific
+// interface.
+func interfaceTable(ifindex int) ([]Interface, error) {
+	tab, err := getIfList()
+	if err != nil {
+		return nil, err
+	}
+
+	var ift []Interface
+	for len(tab) > 0 {
+		ifm := (*syscall.IfMsgHdr)(unsafe.Pointer(&tab[0]))
+		if ifm.Msglen == 0 {
+			break
+		}
+		if ifm.Type == syscall.RTM_IFINFO {
+			if ifindex == 0 || ifindex == int(ifm.Index) {
+				sdl := (*RawSockaddrDatalink)(unsafe.Pointer(&tab[syscall.SizeofIfMsghdr]))
+
+				ifi := &Interface{Index: int(ifm.Index), Flags: linkFlags(ifm.Flags)}
+				ifi.Name = string(sdl.Data[:sdl.Nlen])
+				ifi.HardwareAddr = sdl.Data[sdl.Nlen : sdl.Nlen+sdl.Alen]
+				/* XXX MTU? */
+				ift = append(ift, *ifi)
+				if ifindex == int(ifm.Index) {
+					break
+				}
+			}
+		}
+		tab = tab[ifm.Msglen:]
+	}
+
+	return ift, nil
+}
+
+func linkFlags(rawFlags int32) Flags {
+	var f Flags
+	if rawFlags&syscall.IFF_UP != 0 {
+		f |= FlagUp
+	}
+	if rawFlags&syscall.IFF_BROADCAST != 0 {
+		f |= FlagBroadcast
+	}
+	if rawFlags&syscall.IFF_LOOPBACK != 0 {
+		f |= FlagLoopback
+	}
+	if rawFlags&syscall.IFF_POINTOPOINT != 0 {
+		f |= FlagPointToPoint
+	}
+	if rawFlags&syscall.IFF_MULTICAST != 0 {
+		f |= FlagMulticast
+	}
+	return f
+}
+
+// If the ifi is nil, interfaceAddrTable returns addresses for all
+// network interfaces. Otherwise it returns addresses for a specific
+// interface.
+func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
+	tab, err := getIfList()
+	if err != nil {
+		return nil, err
+	}
+
+	var ifat []Addr
+	for len(tab) > 0 {
+		ifm := (*syscall.IfMsgHdr)(unsafe.Pointer(&tab[0]))
+		if ifm.Msglen == 0 {
+			break
+		}
+		if ifm.Type == syscall.RTM_NEWADDR {
+			if ifi == nil || ifi.Index == int(ifm.Index) {
+				mask := ifm.Addrs
+				off := uint(syscall.SizeofIfMsghdr)
+
+				var iprsa, nmrsa *syscall.RawSockaddr
+				for i := uint(0); i < _RTAX_MAX; i++ {
+					if mask&(1<<i) == 0 {
+						continue
+					}
+					rsa := (*syscall.RawSockaddr)(unsafe.Pointer(&tab[off]))
+					if i == _RTAX_NETMASK {
+						nmrsa = rsa
+					}
+					if i == _RTAX_IFA {
+						iprsa = rsa
+					}
+					off += (uint(rsa.Len) + 3) &^ 3
+				}
+				if iprsa != nil && nmrsa != nil {
+					var mask IPMask
+					var ip IP
+
+					switch iprsa.Family {
+					case syscall.AF_INET:
+						ipsa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(iprsa))
+						nmsa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(nmrsa))
+						ip = IPv4(ipsa.Addr[0], ipsa.Addr[1], ipsa.Addr[2], ipsa.Addr[3])
+						mask = IPv4Mask(nmsa.Addr[0], nmsa.Addr[1], nmsa.Addr[2], nmsa.Addr[3])
+					case syscall.AF_INET6:
+						ipsa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(iprsa))
+						nmsa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(nmrsa))
+						ip = make(IP, IPv6len)
+						copy(ip, ipsa.Addr[:])
+						mask = make(IPMask, IPv6len)
+						copy(mask, nmsa.Addr[:])
+					}
+					ifa := &IPNet{IP: ip, Mask: mask}
+					ifat = append(ifat, ifa)
+				}
+			}
+		}
+		tab = tab[ifm.Msglen:]
+	}
+
+	return ifat, nil
+}
+
+// interfaceMulticastAddrTable returns addresses for a specific
+// interface.
+func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
+	return nil, nil
+}

src/net/internal/socktest/switch_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package socktest
 

src/net/internal/socktest/sys_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
 
 package socktest
 

src/net/iprawsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package net
 

src/net/ipsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package net
 
@@ -134,7 +134,7 @@ func favoriteAddrFamily(network string, laddr, raddr sockaddr, mode string) (fam
 }
 
 func internetSocket(ctx context.Context, net string, laddr, raddr sockaddr, sotype, proto int, mode string, ctrlFn func(string, string, syscall.RawConn) error) (fd *netFD, err error) {
-	if (runtime.GOOS == "windows" || runtime.GOOS == "openbsd" || runtime.GOOS == "nacl") && mode == "dial" && raddr.isWildcard() {
+	if (runtime.GOOS == "aix" || runtime.GOOS == "windows" || runtime.GOOS == "openbsd" || runtime.GOOS == "nacl") && mode == "dial" && raddr.isWildcard() {
 		raddr = raddr.toLocal(net)
 	}
 	family, ipv6only := favoriteAddrFamily(net, laddr, raddr, mode)

src/net/listen_test.go

@@ -674,7 +674,7 @@ func checkMulticastListener(c *UDPConn, ip IP) error {
 
 func multicastRIBContains(ip IP) (bool, error) {
 	switch runtime.GOOS {
-	case "dragonfly", "netbsd", "openbsd", "plan9", "solaris", "windows":
+	case "aix", "dragonfly", "netbsd", "openbsd", "plan9", "solaris", "windows":
 		return true, nil // not implemented yet
 	case "linux":
 		if runtime.GOARCH == "arm" || runtime.GOARCH == "alpha" {

src/net/lookup_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/main_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris
 
 package net
 

src/net/nss.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/platform_test.go

@@ -42,7 +42,7 @@ func testableNetwork(network string) bool {
 		}
 	case "unixpacket":
 		switch runtime.GOOS {
-		case "android", "darwin", "nacl", "plan9", "windows":
+		case "aix", "android", "darwin", "nacl", "plan9", "windows":
 			return false
 		case "netbsd":
 			// It passes on amd64 at least. 386 fails (Issue 22927). arm is unknown.

src/net/port_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris nacl
+// +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris nacl
 
 // Read system port mappings from /etc/services
 

src/net/rawconn_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package net
 

src/net/sendfile_stub.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin js,wasm nacl netbsd openbsd
+// +build aix darwin js,wasm nacl netbsd openbsd
 
 package net
 

src/net/sock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows
 
 package net
 

src/net/sock_stub.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build nacl js,wasm solaris
+// +build aix nacl js,wasm solaris
 
 package net
 

src/net/sockaddr_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package net
 

src/net/sockopt_aix.go

@@ -0,0 +1,38 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"os"
+	"syscall"
+)
+
+// This was copied from sockopt_linux.go
+
+func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
+	if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
+		// Allow both IP versions even if the OS default
+		// is otherwise. Note that some operating systems
+		// never admit this option.
+		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
+	}
+	// Allow broadcast.
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
+}
+
+func setDefaultListenerSockopts(s int) error {
+	// Allow reuse of recently-used addresses.
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
+}
+
+func setDefaultMulticastSockopts(s int) error {
+	// Allow multicast UDP and raw IP datagram sockets to listen
+	// concurrently across multiple listeners.
+	if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
+		return os.NewSyscallError("setsockopt", err)
+	}
+	// Allow reuse of recently-used ports.
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1))
+}

src/net/sockopt_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
 
 package net
 

src/net/sockoptip_bsdvar.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd netbsd openbsd solaris
 
 package net
 

src/net/sockoptip_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
 
 package net
 

src/net/sys_cloexec.go

@@ -5,7 +5,7 @@
 // This file implements sysSocket and accept for platforms that do not
 // provide a fast path for setting SetNonblock and CloseOnExec.
 
-// +build darwin nacl solaris
+// +build aix darwin nacl solaris
 
 package net
 

src/net/tcpsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package net
 

src/net/tcpsockopt_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
 
 package net
 

src/net/tcpsockopt_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build freebsd linux netbsd
+// +build aix freebsd linux netbsd
 
 package net
 

src/net/udpsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package net
 

src/net/unixsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
+// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris windows
 
 package net