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simple .o parser and loader using BPF syscall. .o is a standard ELF generated by LLVM backend It parses elf file compiled by llvm .c->.o - parses 'maps' section and creates maps via BPF syscall - parses 'license' section and passes it to syscall - parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns by storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD - loads eBPF programs via BPF syscall One ELF file can contain multiple BPF programs. int load_bpf_file(char *path); populates prog_fd[] and map_fd[] with FDs received from bpf syscall bpf_helpers.h - helper functions available to eBPF programs written in C Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
25 lines
694 B
C
25 lines
694 B
C
#ifndef __BPF_LOAD_H
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#define __BPF_LOAD_H
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#define MAX_MAPS 32
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#define MAX_PROGS 32
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extern int map_fd[MAX_MAPS];
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extern int prog_fd[MAX_PROGS];
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/* parses elf file compiled by llvm .c->.o
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* . parses 'maps' section and creates maps via BPF syscall
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* . parses 'license' section and passes it to syscall
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* . parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns by
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* storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
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* . loads eBPF programs via BPF syscall
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*
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* One ELF file can contain multiple BPF programs which will be loaded
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* and their FDs stored stored in prog_fd array
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*
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* returns zero on success
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*/
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int load_bpf_file(char *path);
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#endif
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