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/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
* Copyright 2017 Mellanox Technologies, Ltd
*/
#ifndef __TAP_BPF_H__
#define __TAP_BPF_H__
#include <tap_autoconf.h>
/* Do not #include <linux/bpf.h> since eBPF must compile on different
* distros which may include partial definitions for eBPF (while the
* kernel itself may support eBPF). Instead define here all that is needed
*/
/* BPF_MAP_UPDATE_ELEM command flags */
#define BPF_ANY 0 /* create a new element or update an existing */
/* BPF architecture instruction struct */
struct bpf_insn {
__u8 code;
__u8 dst_reg:4;
__u8 src_reg:4;
__s16 off;
__s32 imm; /* immediate value */
};
/* BPF program types */
enum bpf_prog_type {
BPF_PROG_TYPE_UNSPEC,
BPF_PROG_TYPE_SOCKET_FILTER,
BPF_PROG_TYPE_KPROBE,
BPF_PROG_TYPE_SCHED_CLS,
BPF_PROG_TYPE_SCHED_ACT,
};
/* BPF commands types */
enum bpf_cmd {
BPF_MAP_CREATE,
BPF_MAP_LOOKUP_ELEM,
BPF_MAP_UPDATE_ELEM,
BPF_MAP_DELETE_ELEM,
BPF_MAP_GET_NEXT_KEY,
BPF_PROG_LOAD,
};
/* BPF maps types */
enum bpf_map_type {
BPF_MAP_TYPE_UNSPEC,
BPF_MAP_TYPE_HASH,
};
/* union of anonymous structs used with TAP BPF commands */
union bpf_attr {
/* BPF_MAP_CREATE command */
struct {
__u32 map_type;
__u32 key_size;
__u32 value_size;
__u32 max_entries;
__u32 map_flags;
__u32 inner_map_fd;
};
/* BPF_MAP_UPDATE_ELEM, BPF_MAP_DELETE_ELEM commands */
struct {
__u32 map_fd;
__aligned_u64 key;
union {
__aligned_u64 value;
__aligned_u64 next_key;
};
__u64 flags;
};
/* BPF_PROG_LOAD command */
struct {
__u32 prog_type;
__u32 insn_cnt;
__aligned_u64 insns;
__aligned_u64 license;
__u32 log_level;
__u32 log_size;
__aligned_u64 log_buf;
__u32 kern_version;
__u32 prog_flags;
};
} __attribute__((aligned(8)));
#ifndef __NR_bpf
# if defined(__i386__)
# define __NR_bpf 357
# elif defined(__x86_64__)
# define __NR_bpf 321
# elif defined(__arm__)
# define __NR_bpf 386
# elif defined(__aarch64__)
# define __NR_bpf 280
# elif defined(__sparc__)
# define __NR_bpf 349
# elif defined(__s390__)
# define __NR_bpf 351
# elif defined(__powerpc__)
# define __NR_bpf 361
# else
# error __NR_bpf not defined
# endif
#endif
enum {
BPF_MAP_ID_KEY,
BPF_MAP_ID_SIMPLE,
};
static int bpf_load(enum bpf_prog_type type, const struct bpf_insn *insns,
size_t insns_cnt, const char *license);
#endif /* __TAP_BPF_H__ */
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