Quelle  syscall_tp_kern.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
 */
#include <uapi/linux/bpf.h>
#include <bpf/bpf_helpers.h>

#if !defined(__aarch64__)
struct syscalls_enter_open_args {
 unsigned long long unused;
 long syscall_nr;
 long filename_ptr;
 long flags;
 long mode;
};
#endif

struct syscalls_exit_open_args {
 unsigned long long unused;
 long syscall_nr;
 long ret;
};

struct syscalls_enter_open_at_args {
 unsigned long long unused;
 long syscall_nr;
 long long dfd;
 long filename_ptr;
 long flags;
 long mode;
};

struct {
 __uint(type, BPF_MAP_TYPE_ARRAY);
 __type(key, u32);
 __type(value, u32);
 __uint(max_entries, 1);
} enter_open_map SEC(".maps");

struct {
 __uint(type, BPF_MAP_TYPE_ARRAY);
 __type(key, u32);
 __type(value, u32);
 __uint(max_entries, 1);
} exit_open_map SEC(".maps");

static __always_inline void count(void *map)
{
 u32 key = 0;
 u32 *value, init_val = 1;

 value = bpf_map_lookup_elem(map, &key);
 if (value)
  *value += 1;
 else
  bpf_map_update_elem(map, &key, &init_val, BPF_NOEXIST);
}

#if !defined(__aarch64__)
SEC("tracepoint/syscalls/sys_enter_open")
int trace_enter_open(struct syscalls_enter_open_args *ctx)
{
 count(&enter_open_map);
 return 0;
}
#endif

SEC("tracepoint/syscalls/sys_enter_openat")
int trace_enter_open_at(struct syscalls_enter_open_at_args *ctx)
{
 count(&enter_open_map);
 return 0;
}

SEC("tracepoint/syscalls/sys_enter_openat2")
int trace_enter_open_at2(struct syscalls_enter_open_at_args *ctx)
{
 count(&enter_open_map);
 return 0;
}

#if !defined(__aarch64__)
SEC("tracepoint/syscalls/sys_exit_open")
int trace_enter_exit(struct syscalls_exit_open_args *ctx)
{
 count(&exit_open_map);
 return 0;
}
#endif

SEC("tracepoint/syscalls/sys_exit_openat")
int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
{
 count(&exit_open_map);
 return 0;
}

SEC("tracepoint/syscalls/sys_exit_openat2")
int trace_enter_exit_at2(struct syscalls_exit_open_args *ctx)
{
 count(&exit_open_map);
 return 0;
}