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https://github.com/k3s-io/k3s.git
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63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
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package netlink
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/*
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#include <asm/types.h>
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#include <asm/unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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static int load_simple_bpf(int prog_type, int ret) {
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#ifdef __NR_bpf
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// { return ret; }
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__u64 __attribute__((aligned(8))) insns[] = {
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0x00000000000000b7ull | ((__u64)ret<<32),
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0x0000000000000095ull,
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};
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__u8 __attribute__((aligned(8))) license[] = "ASL2";
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// Copied from a header file since libc is notoriously slow to update.
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// The call will succeed or fail and that will be our indication on
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// whether or not it is supported.
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struct {
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__u32 prog_type;
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__u32 insn_cnt;
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__u64 insns;
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__u64 license;
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__u32 log_level;
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__u32 log_size;
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__u64 log_buf;
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__u32 kern_version;
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} __attribute__((aligned(8))) attr = {
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.prog_type = prog_type,
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.insn_cnt = 2,
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.insns = (uintptr_t)&insns,
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.license = (uintptr_t)&license,
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};
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return syscall(__NR_bpf, 5, &attr, sizeof(attr));
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#else
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errno = EINVAL;
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return -1;
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#endif
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}
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*/
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import "C"
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type BpfProgType C.int
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const (
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BPF_PROG_TYPE_UNSPEC BpfProgType = iota
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BPF_PROG_TYPE_SOCKET_FILTER
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BPF_PROG_TYPE_KPROBE
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BPF_PROG_TYPE_SCHED_CLS
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BPF_PROG_TYPE_SCHED_ACT
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BPF_PROG_TYPE_TRACEPOINT
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BPF_PROG_TYPE_XDP
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)
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// loadSimpleBpf loads a trivial bpf program for testing purposes
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func loadSimpleBpf(progType BpfProgType, ret int) (int, error) {
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fd, err := C.load_simple_bpf(C.int(progType), C.int(ret))
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return int(fd), err
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}
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