samples/bpf/bpf_load.h

   1 #ifndef __BPF_LOAD_H
   2 #define __BPF_LOAD_H
   3
   4 #include "libbpf.h"
   5
   6 #define MAX_MAPS 32
   7 #define MAX_PROGS 32
   8
   9 struct bpf_map_def {
  10         unsigned int type;
  11         unsigned int key_size;
  12         unsigned int value_size;
  13         unsigned int max_entries;
  14         unsigned int map_flags;
  15         unsigned int inner_map_idx;
  16 };
  17
  18 struct bpf_map_data {
  19         int fd;
  20         char *name;
  21         size_t elf_offset;
  22         struct bpf_map_def def;
  23 };
  24
  25 typedef void (*fixup_map_cb)(struct bpf_map_data *map, int idx);
  26
  27 extern int prog_fd[MAX_PROGS];
  28 extern int event_fd[MAX_PROGS];
  29 extern char bpf_log_buf[BPF_LOG_BUF_SIZE];
  30 extern int prog_cnt;
  31
  32 /* There is a one-to-one mapping between map_fd[] and map_data[].
  33  * The map_data[] just contains more rich info on the given map.
  34  */
  35 extern int map_fd[MAX_MAPS];
  36 extern struct bpf_map_data map_data[MAX_MAPS];
  37 extern int map_data_count;
  38
  39 /* parses elf file compiled by llvm .c->.o
  40  * . parses 'maps' section and creates maps via BPF syscall
  41  * . parses 'license' section and passes it to syscall
  42  * . parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns by
  43  *   storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
  44  * . loads eBPF programs via BPF syscall
  45  *
  46  * One ELF file can contain multiple BPF programs which will be loaded
  47  * and their FDs stored stored in prog_fd array
  48  *
  49  * returns zero on success
  50  */
  51 int load_bpf_file(char *path);
  52 int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map);
  53
  54 void read_trace_pipe(void);
  55 struct ksym {
  56         long addr;
  57         char *name;
  58 };
  59
  60 int load_kallsyms(void);
  61 struct ksym *ksym_search(long key);
  62 int set_link_xdp_fd(int ifindex, int fd, __u32 flags);
  63 #endif