/*

 * bpf_util.h	BPF common code

 *

 *		This program is free software; you can distribute it and/or

 *		modify it under the terms of the GNU General Public License

 *		as published by the Free Software Foundation; either version

 *		2 of the License, or (at your option) any later version.

 *

 * Authors:	Daniel Borkmann <daniel@iogearbox.net>

 *		Jiri Pirko <jiri@resnulli.us>

 */

#ifndef __BPF_UTIL__

#define __BPF_UTIL__

#include <linux/bpf.h>

#include <linux/btf.h>

#include <linux/filter.h>

#include <linux/magic.h>

#include <linux/elf-em.h>

#include <linux/if_alg.h>

#include "utils.h"

#include "bpf_scm.h"

#define BPF_ENV_UDS	"TC_BPF_UDS"

#define BPF_ENV_MNT	"TC_BPF_MNT"

#ifndef BPF_MAX_LOG

# define BPF_MAX_LOG	4096

#endif

#define BPF_DIR_GLOBALS	"globals"

#ifndef BPF_FS_MAGIC

# define BPF_FS_MAGIC	0xcafe4a11

#endif

#define BPF_DIR_MNT	"/sys/fs/bpf"

#ifndef TRACEFS_MAGIC

# define TRACEFS_MAGIC	0x74726163

#endif

#define TRACE_DIR_MNT	"/sys/kernel/tracing"

#ifndef AF_ALG

# define AF_ALG		38

#endif

#ifndef EM_BPF

# define EM_BPF		247

#endif

struct bpf_cfg_ops {

	void (*cbpf_cb)(void *nl, const struct sock_filter *ops, int ops_len);

	void (*ebpf_cb)(void *nl, int fd, const char *annotation);

};

enum bpf_mode {

	CBPF_BYTECODE,

	CBPF_FILE,

	EBPF_OBJECT,

	EBPF_PINNED,

	BPF_MODE_MAX,

};

struct bpf_cfg_in {

	const char *object;

	const char *section;

	const char *uds;

	enum bpf_prog_type type;

	enum bpf_mode mode;

	__u32 ifindex;

	bool verbose;

	int argc;

	char **argv;

	struct sock_filter opcodes[BPF_MAXINSNS];

	union {

		int n_opcodes;

		int prog_fd;

	};

};

/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */

#define BPF_ALU64_REG(OP, DST, SRC)				\

	((struct bpf_insn) {					\

		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,	\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = 0,					\

		.imm   = 0 })

#define BPF_ALU32_REG(OP, DST, SRC)				\

	((struct bpf_insn) {					\

		.code  = BPF_ALU | BPF_OP(OP) | BPF_X,		\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = 0,					\

		.imm   = 0 })

/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */

#define BPF_ALU64_IMM(OP, DST, IMM)				\

	((struct bpf_insn) {					\

		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,	\

		.dst_reg = DST,					\

		.src_reg = 0,					\

		.off   = 0,					\

		.imm   = IMM })

#define BPF_ALU32_IMM(OP, DST, IMM)				\

	((struct bpf_insn) {					\

		.code  = BPF_ALU | BPF_OP(OP) | BPF_K,		\

		.dst_reg = DST,					\

		.src_reg = 0,					\

		.off   = 0,					\

		.imm   = IMM })

/* Short form of mov, dst_reg = src_reg */

#define BPF_MOV64_REG(DST, SRC)					\

	((struct bpf_insn) {					\

		.code  = BPF_ALU64 | BPF_MOV | BPF_X,		\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = 0,					\

		.imm   = 0 })

#define BPF_MOV32_REG(DST, SRC)					\

	((struct bpf_insn) {					\

		.code  = BPF_ALU | BPF_MOV | BPF_X,		\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = 0,					\

		.imm   = 0 })

/* Short form of mov, dst_reg = imm32 */

#define BPF_MOV64_IMM(DST, IMM)					\

	((struct bpf_insn) {					\

		.code  = BPF_ALU64 | BPF_MOV | BPF_K,		\

		.dst_reg = DST,					\

		.src_reg = 0,					\

		.off   = 0,					\

		.imm   = IMM })

#define BPF_MOV32_IMM(DST, IMM)					\

	((struct bpf_insn) {					\

		.code  = BPF_ALU | BPF_MOV | BPF_K,		\

		.dst_reg = DST,					\

		.src_reg = 0,					\

		.off   = 0,					\

		.imm   = IMM })

/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */

#define BPF_LD_IMM64(DST, IMM)					\

	BPF_LD_IMM64_RAW(DST, 0, IMM)

#define BPF_LD_IMM64_RAW(DST, SRC, IMM)				\

	((struct bpf_insn) {					\

		.code  = BPF_LD | BPF_DW | BPF_IMM,		\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = 0,					\

		.imm   = (__u32) (IMM) }),			\

	((struct bpf_insn) {					\

		.code  = 0, /* zero is reserved opcode */	\

		.dst_reg = 0,					\

		.src_reg = 0,					\

		.off   = 0,					\

		.imm   = ((__u64) (IMM)) >> 32 })

#ifndef BPF_PSEUDO_MAP_FD

# define BPF_PSEUDO_MAP_FD	1

#endif

/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */

#define BPF_LD_MAP_FD(DST, MAP_FD)				\

	BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)

/* Direct packet access, R0 = *(uint *) (skb->data + imm32) */

#define BPF_LD_ABS(SIZE, IMM)					\

	((struct bpf_insn) {					\

		.code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,	\

		.dst_reg = 0,					\

		.src_reg = 0,					\

		.off   = 0,					\

		.imm   = IMM })

/* Memory load, dst_reg = *(uint *) (src_reg + off16) */

#define BPF_LDX_MEM(SIZE, DST, SRC, OFF)			\

	((struct bpf_insn) {					\

		.code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,	\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = OFF,					\

		.imm   = 0 })

/* Memory store, *(uint *) (dst_reg + off16) = src_reg */

#define BPF_STX_MEM(SIZE, DST, SRC, OFF)			\

	((struct bpf_insn) {					\

		.code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,	\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = OFF,					\

		.imm   = 0 })

/* Memory store, *(uint *) (dst_reg + off16) = imm32 */

#define BPF_ST_MEM(SIZE, DST, OFF, IMM)				\

	((struct bpf_insn) {					\

		.code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,	\

		.dst_reg = DST,					\

		.src_reg = 0,					\

		.off   = OFF,					\

		.imm   = IMM })

/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */

#define BPF_JMP_REG(OP, DST, SRC, OFF)				\

	((struct bpf_insn) {					\

		.code  = BPF_JMP | BPF_OP(OP) | BPF_X,		\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = OFF,					\

		.imm   = 0 })

/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */

#define BPF_JMP_IMM(OP, DST, IMM, OFF)				\

	((struct bpf_insn) {					\

		.code  = BPF_JMP | BPF_OP(OP) | BPF_K,		\

		.dst_reg = DST,					\

		.src_reg = 0,					\

		.off   = OFF,					\

		.imm   = IMM })

/* Raw code statement block */

#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)			\

	((struct bpf_insn) {					\

		.code  = CODE,					\

		.dst_reg = DST,					\

		.src_reg = SRC,					\

		.off   = OFF,					\

		.imm   = IMM })

/* Program exit */

#define BPF_EXIT_INSN()						\

	((struct bpf_insn) {					\

		.code  = BPF_JMP | BPF_EXIT,			\

		.dst_reg = 0,					\

		.src_reg = 0,					\

		.off   = 0,					\

		.imm   = 0 })

int bpf_parse_common(struct bpf_cfg_in *cfg, const struct bpf_cfg_ops *ops);

int bpf_load_common(struct bpf_cfg_in *cfg, const struct bpf_cfg_ops *ops,

		    void *nl);

int bpf_parse_and_load_common(struct bpf_cfg_in *cfg,

			      const struct bpf_cfg_ops *ops, void *nl);

const char *bpf_prog_to_default_section(enum bpf_prog_type type);

int bpf_graft_map(const char *map_path, uint32_t *key, int argc, char **argv);

int bpf_trace_pipe(void);

void bpf_print_ops(struct rtattr *bpf_ops, __u16 len);

int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns,

		  size_t size_insns, const char *license, char *log,

		  size_t size_log);

int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type);

int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type);

int bpf_dump_prog_info(FILE *f, uint32_t id);

#ifdef HAVE_ELF

int bpf_send_map_fds(const char *path, const char *obj);

int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux,

		     unsigned int entries);

#else

static inline int bpf_send_map_fds(const char *path, const char *obj)

{

	return 0;

}

static inline int bpf_recv_map_fds(const char *path, int *fds,

				   struct bpf_map_aux *aux,

				   unsigned int entries)

{

	return -1;

}

#endif /* HAVE_ELF */

#endif /* __BPF_UTIL__ */