syscall: add BPF support for freebsd/386, freebsd/amd64

R=rsc
CC=golang-dev
https://golang.org/cl/4331050

src/pkg/syscall/mkerrors.sh

@@ -60,6 +60,7 @@ includes_FreeBSD='
 #include <sys/sockio.h>
 #include <sys/sysctl.h>
 #include <sys/wait.h>
+#include <net/bpf.h>
 #include <net/if.h>
 #include <net/route.h>
 #include <netinet/in.h>
@@ -118,7 +119,7 @@ done
 		$2 ~ /^E[A-Z0-9_]+$/ ||
 		$2 ~ /^SIG[^_]/ ||
 		$2 ~ /^IN_/ ||
-		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|IFF|NET_RT|RTM|RTF|RTV|RTA|RTAX|MCL)_/ ||
+		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL)_/ ||
 		$2 == "SOMAXCONN" ||
 		$2 == "NAME_MAX" ||
 		$2 == "IFNAMSIZ" ||
@@ -130,6 +131,9 @@ done
 		$2 ~ /^LINUX_REBOOT_CMD_/ ||
 		$2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
 		$2 ~ /^SIOC/ ||
+		$2 ~ /^(IFF|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
+		$2 ~ /^BIOC/ ||
+		$2 ~ /^(BPF|DLT)_/ ||
 		$2 !~ "WMESGLEN" &&
 		$2 ~ /^W[A-Z0-9]+$/ {printf("\t$%s = %s,\n", $2, $2)}
 		$2 ~ /^__WCOREFLAG$/ {next}

src/pkg/syscall/types_freebsd.c

@@ -26,6 +26,7 @@ Input to godefs.  See also mkerrors.sh and mkall.sh
 #include <sys/types.h>
 #include <sys/un.h>
 #include <sys/wait.h>
+#include <net/bpf.h>
 #include <net/if.h>
 #include <net/if_dl.h>
 #include <net/route.h>
@@ -167,3 +168,23 @@ typedef struct if_data $IfData;
 typedef struct ifa_msghdr $IfaMsghdr;
 typedef struct rt_msghdr $RtMsghdr;
 typedef struct rt_metrics $RtMetrics;
+
+// Berkeley packet filter
+
+enum {
+	$SizeofBpfVersion = sizeof(struct bpf_version),
+	$SizeofBpfStat = sizeof(struct bpf_stat),
+	$SizeofBpfZbuf = sizeof(struct bpf_zbuf),
+	$SizeofBpfProgram = sizeof(struct bpf_program),
+	$SizeofBpfInsn = sizeof(struct bpf_insn),
+	$SizeofBpfHdr = sizeof(struct bpf_hdr),
+	$SizeofBpfZbufHeader = sizeof(struct bpf_zbuf_header),
+};
+
+typedef struct bpf_version $BpfVersion;
+typedef struct bpf_stat $BpfStat;
+typedef struct bpf_zbuf $BpfZbuf;
+typedef struct bpf_program $BpfProgram;
+typedef struct bpf_insn $BpfInsn;
+typedef struct bpf_hdr $BpfHdr;
+typedef struct bpf_zbuf_header $BpfZbufHeader;

src/pkg/syscall/ztypes_freebsd_386.go

@@ -43,6 +43,13 @@ const (
 	SizeofIfaMsghdr        = 0x14
 	SizeofRtMsghdr         = 0x5c
 	SizeofRtMetrics        = 0x38
+	SizeofBpfVersion       = 0x4
+	SizeofBpfStat          = 0x8
+	SizeofBpfZbuf          = 0xc
+	SizeofBpfProgram       = 0x8
+	SizeofBpfInsn          = 0x8
+	SizeofBpfHdr           = 0x14
+	SizeofBpfZbufHeader    = 0x20
 )
 
 // Types
@@ -326,3 +333,46 @@ type RtMetrics struct {
 	Weight   uint32
 	Filler   [3]uint32
 }
+
+type BpfVersion struct {
+	Major uint16
+	Minor uint16
+}
+
+type BpfStat struct {
+	Recv uint32
+	Drop uint32
+}
+
+type BpfZbuf struct {
+	Bufa   *byte
+	Bufb   *byte
+	Buflen uint32
+}
+
+type BpfProgram struct {
+	Len   uint32
+	Insns *BpfInsn
+}
+
+type BpfInsn struct {
+	Code uint16
+	Jt   uint8
+	Jf   uint8
+	K    uint32
+}
+
+type BpfHdr struct {
+	Tstamp       Timeval
+	Caplen       uint32
+	Datalen      uint32
+	Hdrlen       uint16
+	Pad_godefs_0 [2]byte
+}
+
+type BpfZbufHeader struct {
+	Kernel_gen uint32
+	Kernel_len uint32
+	User_gen   uint32
+	X_bzh_pad  [5]uint32
+}

src/pkg/syscall/ztypes_freebsd_amd64.go

@@ -43,6 +43,13 @@ const (
 	SizeofIfaMsghdr        = 0x14
 	SizeofRtMsghdr         = 0x98
 	SizeofRtMetrics        = 0x70
+	SizeofBpfVersion       = 0x4
+	SizeofBpfStat          = 0x8
+	SizeofBpfZbuf          = 0x18
+	SizeofBpfProgram       = 0x10
+	SizeofBpfInsn          = 0x8
+	SizeofBpfHdr           = 0x20
+	SizeofBpfZbufHeader    = 0x20
 )
 
 // Types
@@ -329,3 +336,47 @@ type RtMetrics struct {
 	Weight   uint64
 	Filler   [3]uint64
 }
+
+type BpfVersion struct {
+	Major uint16
+	Minor uint16
+}
+
+type BpfStat struct {
+	Recv uint32
+	Drop uint32
+}
+
+type BpfZbuf struct {
+	Bufa   *byte
+	Bufb   *byte
+	Buflen uint64
+}
+
+type BpfProgram struct {
+	Len          uint32
+	Pad_godefs_0 [4]byte
+	Insns        *BpfInsn
+}
+
+type BpfInsn struct {
+	Code uint16
+	Jt   uint8
+	Jf   uint8
+	K    uint32
+}
+
+type BpfHdr struct {
+	Tstamp       Timeval
+	Caplen       uint32
+	Datalen      uint32
+	Hdrlen       uint16
+	Pad_godefs_0 [6]byte
+}
+
+type BpfZbufHeader struct {
+	Kernel_gen uint32
+	Kernel_len uint32
+	User_gen   uint32
+	X_bzh_pad  [5]uint32
+}