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package netlink
import (
"unsafe"
"golang.org/x/sys/unix"
)
type BpfProgType uint32
const (
BPF_PROG_TYPE_UNSPEC BpfProgType = iota
BPF_PROG_TYPE_SOCKET_FILTER
BPF_PROG_TYPE_KPROBE
BPF_PROG_TYPE_SCHED_CLS
BPF_PROG_TYPE_SCHED_ACT
BPF_PROG_TYPE_TRACEPOINT
BPF_PROG_TYPE_XDP
BPF_PROG_TYPE_PERF_EVENT
BPF_PROG_TYPE_CGROUP_SKB
BPF_PROG_TYPE_CGROUP_SOCK
BPF_PROG_TYPE_LWT_IN
BPF_PROG_TYPE_LWT_OUT
BPF_PROG_TYPE_LWT_XMIT
BPF_PROG_TYPE_SOCK_OPS
BPF_PROG_TYPE_SK_SKB
BPF_PROG_TYPE_CGROUP_DEVICE
BPF_PROG_TYPE_SK_MSG
BPF_PROG_TYPE_RAW_TRACEPOINT
BPF_PROG_TYPE_CGROUP_SOCK_ADDR
BPF_PROG_TYPE_LWT_SEG6LOCAL
BPF_PROG_TYPE_LIRC_MODE2
BPF_PROG_TYPE_SK_REUSEPORT
BPF_PROG_TYPE_FLOW_DISSECTOR
BPF_PROG_TYPE_CGROUP_SYSCTL
BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE
BPF_PROG_TYPE_CGROUP_SOCKOPT
BPF_PROG_TYPE_TRACING
BPF_PROG_TYPE_STRUCT_OPS
BPF_PROG_TYPE_EXT
BPF_PROG_TYPE_LSM
BPF_PROG_TYPE_SK_LOOKUP
)
type BPFAttr struct {
ProgType uint32
InsnCnt uint32
Insns uintptr
License uintptr
LogLevel uint32
LogSize uint32
LogBuf uintptr
KernVersion uint32
}
// loadSimpleBpf loads a trivial bpf program for testing purposes.
func loadSimpleBpf(progType BpfProgType, ret uint32) (int, error) {
insns := []uint64{
0x00000000000000b7 | (uint64(ret) << 32),
0x0000000000000095,
}
license := []byte{'A', 'S', 'L', '2', '\x00'}
attr := BPFAttr{
ProgType: uint32(progType),
InsnCnt: uint32(len(insns)),
Insns: uintptr(unsafe.Pointer(&insns[0])),
License: uintptr(unsafe.Pointer(&license[0])),
}
fd, _, errno := unix.Syscall(unix.SYS_BPF,
5, /* bpf cmd */
uintptr(unsafe.Pointer(&attr)),
unsafe.Sizeof(attr))
if errno != 0 {
return 0, errno
}
return int(fd), nil
}
|
