syscall: update BPF support for BSD variants

R=dave, rsc
CC=golang-dev
https://golang.org/cl/4589044

src/pkg/syscall/Makefile

@@ -17,12 +17,14 @@ GOFILES=\
 	ztypes_$(GOOS)_$(GOARCH).go\
 
 GOFILES_freebsd=\
+	bpf_bsd.go\
 	exec_unix.go\
 	route_bsd.go\
 	syscall_bsd.go\
 	syscall_unix.go\
 
 GOFILES_darwin=\
+	bpf_bsd.go\
 	exec_unix.go\
 	route_bsd.go\
 	syscall_bsd.go\

src/pkg/syscall/bpf_bsd.go

@@ -0,0 +1,167 @@
+// Copyright 2011 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.
+
+// Berkeley packet filter for BSD variants
+
+package syscall
+
+import (
+	"unsafe"
+)
+
+func BpfStmt(code, k int) *BpfInsn {
+	return &BpfInsn{Code: uint16(code), K: uint32(k)}
+}
+
+func BpfJump(code, k, jt, jf int) *BpfInsn {
+	return &BpfInsn{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
+}
+
+func BpfBuflen(fd int) (int, int) {
+	var l int
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCGBLEN, uintptr(unsafe.Pointer(&l)))
+	if e := int(ep); e != 0 {
+		return 0, e
+	}
+	return l, 0
+}
+
+func SetBpfBuflen(fd, l int) (int, int) {
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCSBLEN, uintptr(unsafe.Pointer(&l)))
+	if e := int(ep); e != 0 {
+		return 0, e
+	}
+	return l, 0
+}
+
+func BpfDatalink(fd int) (int, int) {
+	var t int
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCGDLT, uintptr(unsafe.Pointer(&t)))
+	if e := int(ep); e != 0 {
+		return 0, e
+	}
+	return t, 0
+}
+
+func SetBpfDatalink(fd, t int) (int, int) {
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCSDLT, uintptr(unsafe.Pointer(&t)))
+	if e := int(ep); e != 0 {
+		return 0, e
+	}
+	return t, 0
+}
+
+func SetBpfPromisc(fd, m int) int {
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCPROMISC, uintptr(unsafe.Pointer(&m)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}
+
+func FlushBpf(fd int) int {
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCFLUSH, 0)
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}
+
+type ivalue struct {
+	name  [IFNAMSIZ]byte
+	value int16
+}
+
+func BpfInterface(fd int, name string) (string, int) {
+	var iv ivalue
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCGETIF, uintptr(unsafe.Pointer(&iv)))
+	if e := int(ep); e != 0 {
+		return "", e
+	}
+	return name, 0
+}
+
+func SetBpfInterface(fd int, name string) int {
+	var iv ivalue
+	copy(iv.name[:], []byte(name))
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCSETIF, uintptr(unsafe.Pointer(&iv)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}
+
+func BpfTimeout(fd int) (*Timeval, int) {
+	var tv Timeval
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCGRTIMEOUT, uintptr(unsafe.Pointer(&tv)))
+	if e := int(ep); e != 0 {
+		return nil, e
+	}
+	return &tv, 0
+}
+
+func SetBpfTimeout(fd int, tv *Timeval) int {
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCSRTIMEOUT, uintptr(unsafe.Pointer(tv)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}
+
+func BpfStats(fd int) (*BpfStat, int) {
+	var s BpfStat
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCGSTATS, uintptr(unsafe.Pointer(&s)))
+	if e := int(ep); e != 0 {
+		return nil, e
+	}
+	return &s, 0
+}
+
+func SetBpfImmediate(fd, m int) int {
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCIMMEDIATE, uintptr(unsafe.Pointer(&m)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}
+
+func SetBpf(fd int, i []BpfInsn) int {
+	var p BpfProgram
+	p.Len = uint32(len(i))
+	p.Insns = (*BpfInsn)(unsafe.Pointer(&i[0]))
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCSETF, uintptr(unsafe.Pointer(&p)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}
+
+func CheckBpfVersion(fd int) int {
+	var v BpfVersion
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCVERSION, uintptr(unsafe.Pointer(&v)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	if v.Major != BPF_MAJOR_VERSION || v.Minor != BPF_MINOR_VERSION {
+		return EINVAL
+	}
+	return 0
+}
+
+func BpfHeadercmpl(fd int) (int, int) {
+	var f int
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCGHDRCMPLT, uintptr(unsafe.Pointer(&f)))
+	if e := int(ep); e != 0 {
+		return 0, e
+	}
+	return f, 0
+}
+
+func SetBpfHeadercmpl(fd, f int) int {
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(fd), BIOCSHDRCMPLT, uintptr(unsafe.Pointer(&f)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}