[linux-2.6-block.git] / samples / bpf / bpf_helpers.h

#ifndef __BPF_HELPERS_H
#define __BPF_HELPERS_H

/* helper macro to place programs, maps, license in
 * different sections in elf_bpf file. Section names
 * are interpreted by elf_bpf loader
 */
#define SEC(NAME) __attribute__((section(NAME), used))

/* helper functions called from eBPF programs written in C */
static void *(*bpf_map_lookup_elem)(void *map, void *key) =
	(void *) BPF_FUNC_map_lookup_elem;
static int (*bpf_map_update_elem)(void *map, void *key, void *value,
				  unsigned long long flags) =
	(void *) BPF_FUNC_map_update_elem;
static int (*bpf_map_delete_elem)(void *map, void *key) =
	(void *) BPF_FUNC_map_delete_elem;
static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
	(void *) BPF_FUNC_probe_read;
static unsigned long long (*bpf_ktime_get_ns)(void) =
	(void *) BPF_FUNC_ktime_get_ns;
static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
	(void *) BPF_FUNC_trace_printk;
static void (*bpf_tail_call)(void *ctx, void *map, int index) =
	(void *) BPF_FUNC_tail_call;
static unsigned long long (*bpf_get_smp_processor_id)(void) =
	(void *) BPF_FUNC_get_smp_processor_id;
static unsigned long long (*bpf_get_current_pid_tgid)(void) =
	(void *) BPF_FUNC_get_current_pid_tgid;
static unsigned long long (*bpf_get_current_uid_gid)(void) =
	(void *) BPF_FUNC_get_current_uid_gid;
static int (*bpf_get_current_comm)(void *buf, int buf_size) =
	(void *) BPF_FUNC_get_current_comm;
static int (*bpf_perf_event_read)(void *map, int index) =
	(void *) BPF_FUNC_perf_event_read;
static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
	(void *) BPF_FUNC_clone_redirect;
static int (*bpf_redirect)(int ifindex, int flags) =
	(void *) BPF_FUNC_redirect;
static int (*bpf_perf_event_output)(void *ctx, void *map, int index, void *data, int size) =
	(void *) BPF_FUNC_perf_event_output;
static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
	(void *) BPF_FUNC_get_stackid;
static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
	(void *) BPF_FUNC_probe_write_user;

/* llvm builtin functions that eBPF C program may use to
 * emit BPF_LD_ABS and BPF_LD_IND instructions
 */
struct sk_buff;
unsigned long long load_byte(void *skb,
			     unsigned long long off) asm("llvm.bpf.load.byte");
unsigned long long load_half(void *skb,
			     unsigned long long off) asm("llvm.bpf.load.half");
unsigned long long load_word(void *skb,
			     unsigned long long off) asm("llvm.bpf.load.word");

/* a helper structure used by eBPF C program
 * to describe map attributes to elf_bpf loader
 */
struct bpf_map_def {
	unsigned int type;
	unsigned int key_size;
	unsigned int value_size;
	unsigned int max_entries;
	unsigned int map_flags;
};

static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
	(void *) BPF_FUNC_skb_store_bytes;
static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
	(void *) BPF_FUNC_l3_csum_replace;
static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
	(void *) BPF_FUNC_l4_csum_replace;
static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
	(void *) BPF_FUNC_skb_under_cgroup;

#if defined(__x86_64__)

#define PT_REGS_PARM1(x) ((x)->di)
#define PT_REGS_PARM2(x) ((x)->si)
#define PT_REGS_PARM3(x) ((x)->dx)
#define PT_REGS_PARM4(x) ((x)->cx)
#define PT_REGS_PARM5(x) ((x)->r8)
#define PT_REGS_RET(x) ((x)->sp)
#define PT_REGS_FP(x) ((x)->bp)
#define PT_REGS_RC(x) ((x)->ax)
#define PT_REGS_SP(x) ((x)->sp)
#define PT_REGS_IP(x) ((x)->ip)

#elif defined(__s390x__)

#define PT_REGS_PARM1(x) ((x)->gprs[2])
#define PT_REGS_PARM2(x) ((x)->gprs[3])
#define PT_REGS_PARM3(x) ((x)->gprs[4])
#define PT_REGS_PARM4(x) ((x)->gprs[5])
#define PT_REGS_PARM5(x) ((x)->gprs[6])
#define PT_REGS_RET(x) ((x)->gprs[14])
#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
#define PT_REGS_RC(x) ((x)->gprs[2])
#define PT_REGS_SP(x) ((x)->gprs[15])
#define PT_REGS_IP(x) ((x)->ip)

#elif defined(__aarch64__)

#define PT_REGS_PARM1(x) ((x)->regs[0])
#define PT_REGS_PARM2(x) ((x)->regs[1])
#define PT_REGS_PARM3(x) ((x)->regs[2])
#define PT_REGS_PARM4(x) ((x)->regs[3])
#define PT_REGS_PARM5(x) ((x)->regs[4])
#define PT_REGS_RET(x) ((x)->regs[30])
#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
#define PT_REGS_RC(x) ((x)->regs[0])
#define PT_REGS_SP(x) ((x)->sp)
#define PT_REGS_IP(x) ((x)->pc)

#elif defined(__powerpc__)

#define PT_REGS_PARM1(x) ((x)->gpr[3])
#define PT_REGS_PARM2(x) ((x)->gpr[4])
#define PT_REGS_PARM3(x) ((x)->gpr[5])
#define PT_REGS_PARM4(x) ((x)->gpr[6])
#define PT_REGS_PARM5(x) ((x)->gpr[7])
#define PT_REGS_RC(x) ((x)->gpr[3])
#define PT_REGS_SP(x) ((x)->sp)
#define PT_REGS_IP(x) ((x)->nip)

#endif

#ifdef __powerpc__
#define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = (ctx)->link; })
#define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
#else
#define BPF_KPROBE_READ_RET_IP(ip, ctx)		({				\
		bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
#define BPF_KRETPROBE_READ_RET_IP(ip, ctx)	({				\
		bpf_probe_read(&(ip), sizeof(ip),				\
				(void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
#endif

#endif
Commit	Line	Data
249b812d AS	1	#ifndef __BPF_HELPERS_H
	2	#define __BPF_HELPERS_H
	3
	4	/* helper macro to place programs, maps, license in
	5	* different sections in elf_bpf file. Section names
	6	* are interpreted by elf_bpf loader
	7	*/
	8	#define SEC(NAME) __attribute__((section(NAME), used))
	9
	10	/* helper functions called from eBPF programs written in C */
	11	static void (bpf_map_lookup_elem)(void map, void key) =
	12	(void *) BPF_FUNC_map_lookup_elem;
	13	static int (bpf_map_update_elem)(void map, void key, void value,
	14	unsigned long long flags) =
	15	(void *) BPF_FUNC_map_update_elem;
	16	static int (bpf_map_delete_elem)(void map, void *key) =
	17	(void *) BPF_FUNC_map_delete_elem;
b896c4f9 AS	18	static int (bpf_probe_read)(void dst, int size, void *unsafe_ptr) =
	19	(void *) BPF_FUNC_probe_read;
	20	static unsigned long long (*bpf_ktime_get_ns)(void) =
	21	(void *) BPF_FUNC_ktime_get_ns;
	22	static int (bpf_trace_printk)(const char fmt, int fmt_size, ...) =
	23	(void *) BPF_FUNC_trace_printk;
5bacd780 AS	24	static void (bpf_tail_call)(void ctx, void *map, int index) =
5bacd780 AS	25	(void *) BPF_FUNC_tail_call;
530b2c86 AS	26	static unsigned long long (*bpf_get_smp_processor_id)(void) =
530b2c86 AS	27	(void *) BPF_FUNC_get_smp_processor_id;
ffeedafb AS	28	static unsigned long long (*bpf_get_current_pid_tgid)(void) =
	29	(void *) BPF_FUNC_get_current_pid_tgid;
	30	static unsigned long long (*bpf_get_current_uid_gid)(void) =
	31	(void *) BPF_FUNC_get_current_uid_gid;
	32	static int (bpf_get_current_comm)(void buf, int buf_size) =
	33	(void *) BPF_FUNC_get_current_comm;
47efb302 KX	34	static int (bpf_perf_event_read)(void map, int index) =
47efb302 KX	35	(void *) BPF_FUNC_perf_event_read;
27b29f63 AS	36	static int (bpf_clone_redirect)(void ctx, int ifindex, int flags) =
	37	(void *) BPF_FUNC_clone_redirect;
	38	static int (*bpf_redirect)(int ifindex, int flags) =
	39	(void *) BPF_FUNC_redirect;
39111695 AS	40	static int (bpf_perf_event_output)(void ctx, void map, int index, void data, int size) =
39111695 AS	41	(void *) BPF_FUNC_perf_event_output;
a6ffe7b9 AS	42	static int (bpf_get_stackid)(void ctx, void *map, int flags) =
a6ffe7b9 AS	43	(void *) BPF_FUNC_get_stackid;
96ae5227 SD	44	static int (bpf_probe_write_user)(void dst, void *src, int size) =
96ae5227 SD	45	(void *) BPF_FUNC_probe_write_user;
249b812d AS	46
	47	/* llvm builtin functions that eBPF C program may use to
	48	* emit BPF_LD_ABS and BPF_LD_IND instructions
	49	*/
	50	struct sk_buff;
	51	unsigned long long load_byte(void *skb,
	52	unsigned long long off) asm("llvm.bpf.load.byte");
	53	unsigned long long load_half(void *skb,
	54	unsigned long long off) asm("llvm.bpf.load.half");
	55	unsigned long long load_word(void *skb,
	56	unsigned long long off) asm("llvm.bpf.load.word");
	57
	58	/* a helper structure used by eBPF C program
	59	* to describe map attributes to elf_bpf loader
	60	*/
	61	struct bpf_map_def {
	62	unsigned int type;
	63	unsigned int key_size;
	64	unsigned int value_size;
	65	unsigned int max_entries;
89b97607	66	unsigned int map_flags;
249b812d AS	67	};
249b812d AS	68
91bc4822 AS	69	static int (bpf_skb_store_bytes)(void ctx, int off, void *from, int len, int flags) =
	70	(void *) BPF_FUNC_skb_store_bytes;
	71	static int (bpf_l3_csum_replace)(void ctx, int off, int from, int to, int flags) =
	72	(void *) BPF_FUNC_l3_csum_replace;
	73	static int (bpf_l4_csum_replace)(void ctx, int off, int from, int to, int flags) =
	74	(void *) BPF_FUNC_l4_csum_replace;
747ea55e DB	75	static int (bpf_skb_under_cgroup)(void ctx, void *map, int index) =
747ea55e DB	76	(void *) BPF_FUNC_skb_under_cgroup;
91bc4822	77
d912557b MH	78	#if defined(__x86_64__)
	79
	80	#define PT_REGS_PARM1(x) ((x)->di)
	81	#define PT_REGS_PARM2(x) ((x)->si)
	82	#define PT_REGS_PARM3(x) ((x)->dx)
	83	#define PT_REGS_PARM4(x) ((x)->cx)
	84	#define PT_REGS_PARM5(x) ((x)->r8)
	85	#define PT_REGS_RET(x) ((x)->sp)
	86	#define PT_REGS_FP(x) ((x)->bp)
	87	#define PT_REGS_RC(x) ((x)->ax)
	88	#define PT_REGS_SP(x) ((x)->sp)
138d6153	89	#define PT_REGS_IP(x) ((x)->ip)
d912557b MH	90
	91	#elif defined(__s390x__)
	92
	93	#define PT_REGS_PARM1(x) ((x)->gprs[2])
	94	#define PT_REGS_PARM2(x) ((x)->gprs[3])
	95	#define PT_REGS_PARM3(x) ((x)->gprs[4])
	96	#define PT_REGS_PARM4(x) ((x)->gprs[5])
	97	#define PT_REGS_PARM5(x) ((x)->gprs[6])
	98	#define PT_REGS_RET(x) ((x)->gprs[14])
	99	#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
	100	#define PT_REGS_RC(x) ((x)->gprs[2])
	101	#define PT_REGS_SP(x) ((x)->gprs[15])
138d6153	102	#define PT_REGS_IP(x) ((x)->ip)
d912557b	103
85ff8a43 YS	104	#elif defined(__aarch64__)
	105
	106	#define PT_REGS_PARM1(x) ((x)->regs[0])
	107	#define PT_REGS_PARM2(x) ((x)->regs[1])
	108	#define PT_REGS_PARM3(x) ((x)->regs[2])
	109	#define PT_REGS_PARM4(x) ((x)->regs[3])
	110	#define PT_REGS_PARM5(x) ((x)->regs[4])
	111	#define PT_REGS_RET(x) ((x)->regs[30])
	112	#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
	113	#define PT_REGS_RC(x) ((x)->regs[0])
	114	#define PT_REGS_SP(x) ((x)->sp)
138d6153 NR	115	#define PT_REGS_IP(x) ((x)->pc)
	116
	117	#elif defined(__powerpc__)
	118
	119	#define PT_REGS_PARM1(x) ((x)->gpr[3])
	120	#define PT_REGS_PARM2(x) ((x)->gpr[4])
	121	#define PT_REGS_PARM3(x) ((x)->gpr[5])
	122	#define PT_REGS_PARM4(x) ((x)->gpr[6])
	123	#define PT_REGS_PARM5(x) ((x)->gpr[7])
	124	#define PT_REGS_RC(x) ((x)->gpr[3])
	125	#define PT_REGS_SP(x) ((x)->sp)
	126	#define PT_REGS_IP(x) ((x)->nip)
85ff8a43	127
d912557b	128	#endif
138d6153 NR	129
	130	#ifdef __powerpc__
	131	#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
	132	#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
	133	#else
	134	#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
	135	bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
	136	#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
	137	bpf_probe_read(&(ip), sizeof(ip), \
	138	(void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
	139	#endif
	140
249b812d	141	#endif