syscall: add if_announce support for freebsd

Update #4866.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7398047

src/pkg/syscall/mkerrors.sh

@@ -207,7 +207,7 @@ ccflags="$@"
 		$2 ~ /^LINUX_REBOOT_CMD_/ ||
 		$2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
 		$2 !~ "NLA_TYPE_MASK" &&
-		$2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|RT|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P)_/ ||
+		$2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P)_/ ||
 		$2 ~ /^SIOC/ ||
 		$2 ~ /^TIOC/ ||
 		$2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||

src/pkg/syscall/types_freebsd.go

@@ -193,12 +193,13 @@ type FdSet C.fd_set
 // Routing and interface messages
 
 const (
-	SizeofIfMsghdr   = C.sizeof_struct_if_msghdr
-	SizeofIfData     = C.sizeof_struct_if_data
-	SizeofIfaMsghdr  = C.sizeof_struct_ifa_msghdr
-	SizeofIfmaMsghdr = C.sizeof_struct_ifma_msghdr
-	SizeofRtMsghdr   = C.sizeof_struct_rt_msghdr
-	SizeofRtMetrics  = C.sizeof_struct_rt_metrics
+	SizeofIfMsghdr         = C.sizeof_struct_if_msghdr
+	SizeofIfData           = C.sizeof_struct_if_data
+	SizeofIfaMsghdr        = C.sizeof_struct_ifa_msghdr
+	SizeofIfmaMsghdr       = C.sizeof_struct_ifma_msghdr
+	SizeofIfAnnounceMsghdr = C.sizeof_struct_if_announcemsghdr
+	SizeofRtMsghdr         = C.sizeof_struct_rt_msghdr
+	SizeofRtMetrics        = C.sizeof_struct_rt_metrics
 )
 
 type IfMsghdr C.struct_if_msghdr
@@ -209,6 +210,8 @@ type IfaMsghdr C.struct_ifa_msghdr
 
 type IfmaMsghdr C.struct_ifma_msghdr
 
+type IfAnnounceMsghdr C.struct_if_announcemsghdr
+
 type RtMsghdr C.struct_rt_msghdr
 
 type RtMetrics C.struct_rt_metrics

src/pkg/syscall/zerrors_freebsd_386.go

@@ -369,6 +369,8 @@ const (
 	F_UNLCK                           = 0x2
 	F_UNLCKSYS                        = 0x4
 	F_WRLCK                           = 0x3
+	IFAN_ARRIVAL                      = 0x0
+	IFAN_DEPARTURE                    = 0x1
 	IFF_ALLMULTI                      = 0x200
 	IFF_ALTPHYS                       = 0x4000
 	IFF_BROADCAST                     = 0x2

src/pkg/syscall/zerrors_freebsd_amd64.go

@@ -369,6 +369,8 @@ const (
 	F_UNLCK                           = 0x2
 	F_UNLCKSYS                        = 0x4
 	F_WRLCK                           = 0x3
+	IFAN_ARRIVAL                      = 0x0
+	IFAN_DEPARTURE                    = 0x1
 	IFF_ALLMULTI                      = 0x200
 	IFF_ALTPHYS                       = 0x4000
 	IFF_BROADCAST                     = 0x2

src/pkg/syscall/zerrors_freebsd_arm.go

@@ -466,6 +466,8 @@ const (
 	ICANON                            = 0x100
 	ICRNL                             = 0x100
 	IEXTEN                            = 0x400
+	IFAN_ARRIVAL                      = 0x0
+	IFAN_DEPARTURE                    = 0x1
 	IFF_ALLMULTI                      = 0x200
 	IFF_ALTPHYS                       = 0x4000
 	IFF_BROADCAST                     = 0x2

src/pkg/syscall/ztypes_freebsd_386.go

@@ -271,12 +271,13 @@ type FdSet struct {
 }
 
 const (
-	SizeofIfMsghdr   = 0x60
-	SizeofIfData     = 0x50
-	SizeofIfaMsghdr  = 0x14
-	SizeofIfmaMsghdr = 0x10
-	SizeofRtMsghdr   = 0x5c
-	SizeofRtMetrics  = 0x38
+	SizeofIfMsghdr         = 0x60
+	SizeofIfData           = 0x50
+	SizeofIfaMsghdr        = 0x14
+	SizeofIfmaMsghdr       = 0x10
+	SizeofIfAnnounceMsghdr = 0x18
+	SizeofRtMsghdr         = 0x5c
+	SizeofRtMetrics        = 0x38
 )
 
 type IfMsghdr struct {
@@ -339,6 +340,15 @@ type IfmaMsghdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+type IfAnnounceMsghdr struct {
+	Msglen  uint16
+	Version uint8
+	Type    uint8
+	Index   uint16
+	Name    [16]int8
+	What    uint16
+}
+
 type RtMsghdr struct {
 	Msglen    uint16
 	Version   uint8

src/pkg/syscall/ztypes_freebsd_amd64.go

@@ -273,12 +273,13 @@ type FdSet struct {
 }
 
 const (
-	SizeofIfMsghdr   = 0xa8
-	SizeofIfData     = 0x98
-	SizeofIfaMsghdr  = 0x14
-	SizeofIfmaMsghdr = 0x10
-	SizeofRtMsghdr   = 0x98
-	SizeofRtMetrics  = 0x70
+	SizeofIfMsghdr         = 0xa8
+	SizeofIfData           = 0x98
+	SizeofIfaMsghdr        = 0x14
+	SizeofIfmaMsghdr       = 0x10
+	SizeofIfAnnounceMsghdr = 0x18
+	SizeofRtMsghdr         = 0x98
+	SizeofRtMetrics        = 0x70
 )
 
 type IfMsghdr struct {
@@ -341,6 +342,15 @@ type IfmaMsghdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+type IfAnnounceMsghdr struct {
+	Msglen  uint16
+	Version uint8
+	Type    uint8
+	Index   uint16
+	Name    [16]int8
+	What    uint16
+}
+
 type RtMsghdr struct {
 	Msglen    uint16
 	Version   uint8

src/pkg/syscall/ztypes_freebsd_arm.go

@@ -273,12 +273,13 @@ type FdSet struct {
 }
 
 const (
-	SizeofIfMsghdr   = 0x68
-	SizeofIfData     = 0x58
-	SizeofIfaMsghdr  = 0x14
-	SizeofIfmaMsghdr = 0x10
-	SizeofRtMsghdr   = 0x5c
-	SizeofRtMetrics  = 0x38
+	SizeofIfMsghdr         = 0x68
+	SizeofIfData           = 0x58
+	SizeofIfaMsghdr        = 0x14
+	SizeofIfmaMsghdr       = 0x10
+	SizeofIfAnnounceMsghdr = 0x18
+	SizeofRtMsghdr         = 0x5c
+	SizeofRtMetrics        = 0x38
 )
 
 type IfMsghdr struct {
@@ -341,6 +342,15 @@ type IfmaMsghdr struct {
 	Pad_cgo_0 [2]byte
 }
 
+type IfAnnounceMsghdr struct {
+	Msglen  uint16
+	Version uint8
+	Type    uint8
+	Index   uint16
+	Name    [16]int8
+	What    uint16
+}
+
 type RtMsghdr struct {
 	Msglen    uint16
 	Version   uint8