linux/kernel/bpf/preload/iterators/bpf_preload_common.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BPF_PRELOAD_COMMON_H
#define _BPF_PRELOAD_COMMON_H

#define BPF_PRELOAD_START 0x5555
#define BPF_PRELOAD_END 0xAAAA

struct bpf_preload_info {
	char link_name[16];
	int link_id;
};

#endif
bpf: Add kernel module with user mode driver that populates bpffs. Add kernel module with user mode driver that populates bpffs with BPF iterators. $ mount bpffs /my/bpffs/ -t bpf $ ls -la /my/bpffs/ total 4 drwxrwxrwt 2 root root 0 Jul 2 00:27 . drwxr-xr-x 19 root root 4096 Jul 2 00:09 .. -rw------- 1 root root 0 Jul 2 00:27 maps.debug -rw------- 1 root root 0 Jul 2 00:27 progs.debug The user mode driver will load BPF Type Formats, create BPF maps, populate BPF maps, load two BPF programs, attach them to BPF iterators, and finally send two bpf_link IDs back to the kernel. The kernel will pin two bpf_links into newly mounted bpffs instance under names "progs.debug" and "maps.debug". These two files become human readable. $ cat /my/bpffs/progs.debug id name attached 11 dump_bpf_map bpf_iter_bpf_map 12 dump_bpf_prog bpf_iter_bpf_prog 27 test_pkt_access 32 test_main test_pkt_access test_pkt_access 33 test_subprog1 test_pkt_access_subprog1 test_pkt_access 34 test_subprog2 test_pkt_access_subprog2 test_pkt_access 35 test_subprog3 test_pkt_access_subprog3 test_pkt_access 36 new_get_skb_len get_skb_len test_pkt_access 37 new_get_skb_ifindex get_skb_ifindex test_pkt_access 38 new_get_constant get_constant test_pkt_access The BPF program dump_bpf_prog() in iterators.bpf.c is printing this data about all BPF programs currently loaded in the system. This information is unstable and will change from kernel to kernel as ".debug" suffix conveys. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200819042759.51280-4-alexei.starovoitov@gmail.com 2020-08-18 21:27:58 -07:00			`/* SPDX-License-Identifier: GPL-2.0 */`
			`#ifndef _BPF_PRELOAD_COMMON_H`
			`#define _BPF_PRELOAD_COMMON_H`

			`#define BPF_PRELOAD_START 0x5555`
			`#define BPF_PRELOAD_END 0xAAAA`

			`struct bpf_preload_info {`
			`char link_name[16];`
			`int link_id;`
			`};`

			`#endif`