src/basic/bpf-program.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   Copyright 2016 Daniel Mack
   6
   7   [Except for the stuff copy/pasted from the kernel sources, see below]
   8 ***/
   9
  10 #include <linux/bpf.h>
  11 #include <stdint.h>
  12 #include <sys/syscall.h>
  13
  14 #include "list.h"
  15 #include "macro.h"
  16
  17 typedef struct BPFProgram BPFProgram;
  18
  19 struct BPFProgram {
  20         unsigned n_ref;
  21
  22         int kernel_fd;
  23         uint32_t prog_type;
  24
  25         size_t n_instructions;
  26         size_t allocated;
  27         struct bpf_insn *instructions;
  28
  29         char *attached_path;
  30         int attached_type;
  31         uint32_t attached_flags;
  32 };
  33
  34 int bpf_program_new(uint32_t prog_type, BPFProgram **ret);
  35 BPFProgram *bpf_program_unref(BPFProgram *p);
  36 BPFProgram *bpf_program_ref(BPFProgram *p);
  37
  38 int bpf_program_add_instructions(BPFProgram *p, const struct bpf_insn *insn, size_t count);
  39 int bpf_program_load_kernel(BPFProgram *p, char *log_buf, size_t log_size);
  40
  41 int bpf_program_cgroup_attach(BPFProgram *p, int type, const char *path, uint32_t flags);
  42 int bpf_program_cgroup_detach(BPFProgram *p);
  43
  44 int bpf_map_new(enum bpf_map_type type, size_t key_size, size_t value_size, size_t max_entries, uint32_t flags);
  45 int bpf_map_update_element(int fd, const void *key, void *value);
  46 int bpf_map_lookup_element(int fd, const void *key, void *value);
  47
  48 DEFINE_TRIVIAL_CLEANUP_FUNC(BPFProgram*, bpf_program_unref);