[thirdparty/systemd.git] / src / shared / linux / libbpf.h

/* eBPF mini library */
#ifndef __LIBBPF_H
#define __LIBBPF_H

#include <linux/bpf.h>

struct bpf_insn;

/* 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 })

/* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */

#define BPF_STX_XADD(SIZE, DST, SRC, OFF)			\
        ((struct bpf_insn) {					\
                .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,	\
                .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 })

#endif
Commit	Line	Data
3f0c2342 DM	1	/* eBPF mini library */
	2	#ifndef __LIBBPF_H
	3	#define __LIBBPF_H
	4
	5	#include <linux/bpf.h>
	6
	7	struct bpf_insn;
	8
	9	/* ALU ops on registers, bpf_add\|sub\|...: dst_reg += src_reg */
	10
	11	#define BPF_ALU64_REG(OP, DST, SRC) \
	12	((struct bpf_insn) { \
	13	.code = BPF_ALU64 \| BPF_OP(OP) \| BPF_X, \
	14	.dst_reg = DST, \
	15	.src_reg = SRC, \
	16	.off = 0, \
	17	.imm = 0 })
	18
	19	#define BPF_ALU32_REG(OP, DST, SRC) \
	20	((struct bpf_insn) { \
	21	.code = BPF_ALU \| BPF_OP(OP) \| BPF_X, \
	22	.dst_reg = DST, \
	23	.src_reg = SRC, \
	24	.off = 0, \
	25	.imm = 0 })
	26
	27	/* ALU ops on immediates, bpf_add\|sub\|...: dst_reg += imm32 */
	28
	29	#define BPF_ALU64_IMM(OP, DST, IMM) \
	30	((struct bpf_insn) { \
	31	.code = BPF_ALU64 \| BPF_OP(OP) \| BPF_K, \
	32	.dst_reg = DST, \
	33	.src_reg = 0, \
	34	.off = 0, \
	35	.imm = IMM })
	36
	37	#define BPF_ALU32_IMM(OP, DST, IMM) \
	38	((struct bpf_insn) { \
	39	.code = BPF_ALU \| BPF_OP(OP) \| BPF_K, \
	40	.dst_reg = DST, \
	41	.src_reg = 0, \
	42	.off = 0, \
	43	.imm = IMM })
	44
	45	/* Short form of mov, dst_reg = src_reg */
	46
	47	#define BPF_MOV64_REG(DST, SRC) \
	48	((struct bpf_insn) { \
	49	.code = BPF_ALU64 \| BPF_MOV \| BPF_X, \
	50	.dst_reg = DST, \
	51	.src_reg = SRC, \
	52	.off = 0, \
	53	.imm = 0 })
	54
	55	#define BPF_MOV32_REG(DST, SRC) \
	56	((struct bpf_insn) { \
	57	.code = BPF_ALU \| BPF_MOV \| BPF_X, \
	58	.dst_reg = DST, \
	59	.src_reg = SRC, \
	60	.off = 0, \
	61	.imm = 0 })
	62
	63	/* Short form of mov, dst_reg = imm32 */
	64
65	#define BPF_MOV64_IMM(DST, IMM) \
66	((struct bpf_insn) { \
67	.code = BPF_ALU64 \| BPF_MOV \| BPF_K, \
68	.dst_reg = DST, \
69	.src_reg = 0, \
70	.off = 0, \
71	.imm = IMM })
72
73	#define BPF_MOV32_IMM(DST, IMM) \
74	((struct bpf_insn) { \
75	.code = BPF_ALU \| BPF_MOV \| BPF_K, \
76	.dst_reg = DST, \
77	.src_reg = 0, \
78	.off = 0, \
79	.imm = IMM })
80
81	/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
82	#define BPF_LD_IMM64(DST, IMM) \
83	BPF_LD_IMM64_RAW(DST, 0, IMM)
84
85	#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
86	((struct bpf_insn) { \
87	.code = BPF_LD \| BPF_DW \| BPF_IMM, \
88	.dst_reg = DST, \
89	.src_reg = SRC, \
90	.off = 0, \
91	.imm = (__u32) (IMM) }), \
92	((struct bpf_insn) { \
93	.code = 0, /* zero is reserved opcode */ \
94	.dst_reg = 0, \
95	.src_reg = 0, \
96	.off = 0, \
97	.imm = ((__u64) (IMM)) >> 32 })
98
99	#ifndef BPF_PSEUDO_MAP_FD
100	# define BPF_PSEUDO_MAP_FD 1
101	#endif
102
103	/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
104	#define BPF_LD_MAP_FD(DST, MAP_FD) \
105	BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
106
3f0c2342 DM	107	/* Direct packet access, R0 = (uint ) (skb->data + imm32) */
	108
	109	#define BPF_LD_ABS(SIZE, IMM) \
	110	((struct bpf_insn) { \
	111	.code = BPF_LD \| BPF_SIZE(SIZE) \| BPF_ABS, \
	112	.dst_reg = 0, \
	113	.src_reg = 0, \
	114	.off = 0, \
	115	.imm = IMM })
	116
	117	/* Memory load, dst_reg = (uint ) (src_reg + off16) */
	118
	119	#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
	120	((struct bpf_insn) { \
	121	.code = BPF_LDX \| BPF_SIZE(SIZE) \| BPF_MEM, \
	122	.dst_reg = DST, \
	123	.src_reg = SRC, \
	124	.off = OFF, \
	125	.imm = 0 })
	126
	127	/* Memory store, (uint ) (dst_reg + off16) = src_reg */
	128
	129	#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
	130	((struct bpf_insn) { \
	131	.code = BPF_STX \| BPF_SIZE(SIZE) \| BPF_MEM, \
	132	.dst_reg = DST, \
	133	.src_reg = SRC, \
	134	.off = OFF, \
	135	.imm = 0 })
	136
	137	/* Atomic memory add, (uint )(dst_reg + off16) += src_reg */
	138
	139	#define BPF_STX_XADD(SIZE, DST, SRC, OFF) \
	140	((struct bpf_insn) { \
	141	.code = BPF_STX \| BPF_SIZE(SIZE) \| BPF_XADD, \
	142	.dst_reg = DST, \
	143	.src_reg = SRC, \
	144	.off = OFF, \
	145	.imm = 0 })
	146
	147	/* Memory store, (uint ) (dst_reg + off16) = imm32 */
	148
	149	#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
	150	((struct bpf_insn) { \
	151	.code = BPF_ST \| BPF_SIZE(SIZE) \| BPF_MEM, \
	152	.dst_reg = DST, \
	153	.src_reg = 0, \
	154	.off = OFF, \
	155	.imm = IMM })
	156
	157	/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
	158
	159	#define BPF_JMP_REG(OP, DST, SRC, OFF) \
	160	((struct bpf_insn) { \
	161	.code = BPF_JMP \| BPF_OP(OP) \| BPF_X, \
	162	.dst_reg = DST, \
	163	.src_reg = SRC, \
	164	.off = OFF, \
	165	.imm = 0 })
	166
	167	/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
	168
	169	#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
	170	((struct bpf_insn) { \
171	.code = BPF_JMP \| BPF_OP(OP) \| BPF_K, \
172	.dst_reg = DST, \
173	.src_reg = 0, \
174	.off = OFF, \
175	.imm = IMM })
176
177	/* Raw code statement block */
178
179	#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
180	((struct bpf_insn) { \
181	.code = CODE, \
182	.dst_reg = DST, \
183	.src_reg = SRC, \
184	.off = OFF, \
185	.imm = IMM })
186
187	/* Program exit */
188
189	#define BPF_EXIT_INSN() \
190	((struct bpf_insn) { \
191	.code = BPF_JMP \| BPF_EXIT, \
192	.dst_reg = 0, \
193	.src_reg = 0, \
194	.off = 0, \
195	.imm = 0 })
196
197	#endif