Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Minimal BPF assembler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Instead of libpcap high-level filter expressions, it can be quite
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * useful to define filters in low-level BPF assembler (that is kept
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * close to Steven McCanne and Van Jacobson's original BPF paper).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * In particular for BPF JIT implementors, JIT security auditors, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * just for defining BPF expressions that contain extensions which are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * not supported by compilers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * How to get into it:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * 1) read Documentation/networking/filter.rst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * 2) Run `bpf_asm [-c] <filter-prog file>` to translate into binary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *    blob that is loadable with xt_bpf, cls_bpf et al. Note: -c will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *    pretty print a C-like construct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <stdbool.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) extern void bpf_asm_compile(FILE *fp, bool cstyle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int main(int argc, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	FILE *fp = stdin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	bool cstyle = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	for (i = 1; i < argc; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		if (!strncmp("-c", argv[i], 2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 			cstyle = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		fp = fopen(argv[i], "r");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		if (!fp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 			fp = stdin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	bpf_asm_compile(fp, cstyle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }