syscall: add sockaddr_ll support for linux/386, linux/amd64

R=rsc, albert.strasheim
CC=golang-dev
https://golang.org/cl/2356042

src/pkg/syscall/mkerrors.sh

@@ -26,6 +26,7 @@ includes_Linux='
 #include <sys/inotify.h>
 #include <linux/ptrace.h>
 #include <linux/wait.h>
+#include <netpacket/packet.h>
 '
 
 includes_Darwin='
@@ -86,7 +87,7 @@ done
 		$2 ~ /^E[A-Z0-9_]+$/ ||
 		$2 ~ /^SIG[^_]/ ||
 		$2 ~ /^IN_/ ||
-		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP)_/ ||
+		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP|PACKET)_/ ||
 		$2 == "SOMAXCONN" ||
 		$2 == "NAME_MAX" ||
 		$2 ~ /^(O|F|FD|NAME|S|PTRACE)_/ ||

src/pkg/syscall/syscall_linux.go

@@ -261,8 +261,47 @@ func (sa *SockaddrUnix) sockaddr() (uintptr, _Socklen, int) {
 	return uintptr(unsafe.Pointer(&sa.raw)), 1 + _Socklen(n) + 1, 0
 }
 
+type SockaddrLinklayer struct {
+	Protocol uint16
+	Ifindex  int
+	Hatype   uint16
+	Pkttype  uint8
+	Halen    uint8
+	Addr     [8]byte
+	raw      RawSockaddrLinklayer
+}
+
+func (sa *SockaddrLinklayer) sockaddr() (uintptr, _Socklen, int) {
+	if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
+		return 0, 0, EINVAL
+	}
+	sa.raw.Family = AF_PACKET
+	sa.raw.Protocol = sa.Protocol
+	sa.raw.Ifindex = int32(sa.Ifindex)
+	sa.raw.Hatype = sa.Hatype
+	sa.raw.Pkttype = sa.Pkttype
+	sa.raw.Halen = sa.Halen
+	for i := 0; i < len(sa.Addr); i++ {
+		sa.raw.Addr[i] = sa.Addr[i]
+	}
+	return uintptr(unsafe.Pointer(&sa.raw)), SizeofSockaddrLinklayer, 0
+}
+
 func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) {
 	switch rsa.Addr.Family {
+	case AF_PACKET:
+		pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa))
+		sa := new(SockaddrLinklayer)
+		sa.Protocol = pp.Protocol
+		sa.Ifindex = int(pp.Ifindex)
+		sa.Hatype = pp.Hatype
+		sa.Pkttype = pp.Pkttype
+		sa.Halen = pp.Halen
+		for i := 0; i < len(sa.Addr); i++ {
+			sa.Addr[i] = pp.Addr[i]
+		}
+		return sa, 0
+
 	case AF_UNIX:
 		pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
 		sa := new(SockaddrUnix)

src/pkg/syscall/types_linux.c

@@ -15,6 +15,7 @@ Input to godefs.  See also mkerrors.sh and mkall.sh
 #include <fcntl.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
+#include <netpacket/packet.h>
 #include <signal.h>
 #include <stdio.h>
 #include <sys/epoll.h>
@@ -91,6 +92,7 @@ union sockaddr_all {
 	struct sockaddr_in s2;	// these pad it out
 	struct sockaddr_in6 s3;
 	struct sockaddr_un s4;
+	struct sockaddr_ll s5;
 };
 
 struct sockaddr_any {
@@ -101,6 +103,7 @@ struct sockaddr_any {
 typedef struct sockaddr_in $RawSockaddrInet4;
 typedef struct sockaddr_in6 $RawSockaddrInet6;
 typedef struct sockaddr_un $RawSockaddrUnix;
+typedef struct sockaddr_ll $RawSockaddrLinklayer;
 typedef struct sockaddr $RawSockaddr;
 typedef struct sockaddr_any $RawSockaddrAny;
 typedef socklen_t $_Socklen;
@@ -115,6 +118,7 @@ enum {
 	$SizeofSockaddrInet6 = sizeof(struct sockaddr_in6),
 	$SizeofSockaddrAny = sizeof(struct sockaddr_any),
 	$SizeofSockaddrUnix = sizeof(struct sockaddr_un),
+	$SizeofSockaddrLinklayer = sizeof(struct sockaddr_ll),
 	$SizeofLinger = sizeof(struct linger),
 	$SizeofMsghdr = sizeof(struct msghdr),
 	$SizeofCmsghdr = sizeof(struct cmsghdr),

src/pkg/syscall/zerrors_linux_386.go

@@ -408,6 +408,21 @@ const (
 	O_SYNC                           = 0x1000
 	O_TRUNC                          = 0x200
 	O_WRONLY                         = 0x1
+	PACKET_ADD_MEMBERSHIP            = 0x1
+	PACKET_BROADCAST                 = 0x1
+	PACKET_DROP_MEMBERSHIP           = 0x2
+	PACKET_FASTROUTE                 = 0x6
+	PACKET_HOST                      = 0
+	PACKET_LOOPBACK                  = 0x5
+	PACKET_MR_ALLMULTI               = 0x2
+	PACKET_MR_MULTICAST              = 0
+	PACKET_MR_PROMISC                = 0x1
+	PACKET_MULTICAST                 = 0x2
+	PACKET_OTHERHOST                 = 0x3
+	PACKET_OUTGOING                  = 0x4
+	PACKET_RECV_OUTPUT               = 0x3
+	PACKET_RX_RING                   = 0x5
+	PACKET_STATISTICS                = 0x6
 	PTRACE_ATTACH                    = 0x10
 	PTRACE_BTS_CLEAR                 = 0x2c
 	PTRACE_BTS_CONFIG                = 0x28

src/pkg/syscall/zerrors_linux_amd64.go

@@ -408,6 +408,21 @@ const (
 	O_SYNC                           = 0x1000
 	O_TRUNC                          = 0x200
 	O_WRONLY                         = 0x1
+	PACKET_ADD_MEMBERSHIP            = 0x1
+	PACKET_BROADCAST                 = 0x1
+	PACKET_DROP_MEMBERSHIP           = 0x2
+	PACKET_FASTROUTE                 = 0x6
+	PACKET_HOST                      = 0
+	PACKET_LOOPBACK                  = 0x5
+	PACKET_MR_ALLMULTI               = 0x2
+	PACKET_MR_MULTICAST              = 0
+	PACKET_MR_PROMISC                = 0x1
+	PACKET_MULTICAST                 = 0x2
+	PACKET_OTHERHOST                 = 0x3
+	PACKET_OUTGOING                  = 0x4
+	PACKET_RECV_OUTPUT               = 0x3
+	PACKET_RX_RING                   = 0x5
+	PACKET_STATISTICS                = 0x6
 	PTRACE_ARCH_PRCTL                = 0x1e
 	PTRACE_ATTACH                    = 0x10
 	PTRACE_BTS_CLEAR                 = 0x2c

src/pkg/syscall/ztypes_linux_386.go

@@ -16,6 +16,7 @@ const (
 	SizeofSockaddrInet6     = 0x1c
 	SizeofSockaddrAny       = 0x70
 	SizeofSockaddrUnix      = 0x6e
+	SizeofSockaddrLinklayer = 0x14
 	SizeofLinger            = 0x8
 	SizeofMsghdr            = 0x1c
 	SizeofCmsghdr           = 0xc
@@ -181,6 +182,16 @@ type RawSockaddrUnix struct {
 	Path   [108]int8
 }
 
+type RawSockaddrLinklayer struct {
+	Family   uint16
+	Protocol uint16
+	Ifindex  int32
+	Hatype   uint16
+	Pkttype  uint8
+	Halen    uint8
+	Addr     [8]uint8
+}
+
 type RawSockaddr struct {
 	Family uint16
 	Data   [14]int8

src/pkg/syscall/ztypes_linux_amd64.go

@@ -16,6 +16,7 @@ const (
 	SizeofSockaddrInet6     = 0x1c
 	SizeofSockaddrAny       = 0x70
 	SizeofSockaddrUnix      = 0x6e
+	SizeofSockaddrLinklayer = 0x14
 	SizeofLinger            = 0x8
 	SizeofMsghdr            = 0x38
 	SizeofCmsghdr           = 0x10
@@ -181,6 +182,16 @@ type RawSockaddrUnix struct {
 	Path   [108]int8
 }
 
+type RawSockaddrLinklayer struct {
+	Family   uint16
+	Protocol uint16
+	Ifindex  int32
+	Hatype   uint16
+	Pkttype  uint8
+	Halen    uint8
+	Addr     [8]uint8
+}
+
 type RawSockaddr struct {
 	Family uint16
 	Data   [14]int8