Release 4.10 samples/bpf/bpf_helpers.h

Directory: samples/bpf
#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,
				    unsigned long long flags, 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;

static int (*bpf_current_task_under_cgroup)(void *map, int index) =
	(void *) BPF_FUNC_current_task_under_cgroup;

static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
	(void *) BPF_FUNC_skb_get_tunnel_key;

static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
	(void *) BPF_FUNC_skb_set_tunnel_key;

static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
	(void *) BPF_FUNC_skb_get_tunnel_opt;

static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
	(void *) BPF_FUNC_skb_set_tunnel_opt;

static unsigned long long (*bpf_get_prandom_u32)(void) =
	(void *) BPF_FUNC_get_prandom_u32;

static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
	(void *) BPF_FUNC_xdp_adjust_head;

/* 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_load_bytes)(void *ctx, int off, void *to, int len) =
	(void *) BPF_FUNC_skb_load_bytes;

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;

static int (*bpf_skb_change_head)(void *, int len, int flags) =
	(void *) BPF_FUNC_skb_change_head;

#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)->psw.addr)

#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
Overall Contributors
Person Tokens Prop Commits CommitProp
alexei starovoitov alexei starovoitov 555 47.80% 11 45.83%
michael holzheu michael holzheu 142 12.23% 2 8.33%
naveen n. rao naveen n. rao 120 10.34% 1 4.17%
william tu william tu 106 9.13% 1 4.17%
yang shi yang shi 70 6.03% 1 4.17%
thomas graf thomas graf 51 4.39% 1 4.17%
sargun dhillon sargun dhillon 46 3.96% 2 8.33%
martin kafai lau martin kafai lau 44 3.79% 2 8.33%
xia kaixu xia kaixu 21 1.81% 1 4.17%
adam barth adam barth 4 0.34% 1 4.17%
daniel borkmann daniel borkmann 2 0.17% 1 4.17%
Total 1161 100.00% 24 100.00%
Directory: samples/bpf

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
alexei starovoitov	alexei starovoitov	555	47.80%	11	45.83%
michael holzheu	michael holzheu	142	12.23%	2	8.33%
naveen n. rao	naveen n. rao	120	10.34%	1	4.17%
william tu	william tu	106	9.13%	1	4.17%
yang shi	yang shi	70	6.03%	1	4.17%
thomas graf	thomas graf	51	4.39%	1	4.17%
sargun dhillon	sargun dhillon	46	3.96%	2	8.33%
martin kafai lau	martin kafai lau	44	3.79%	2	8.33%
xia kaixu	xia kaixu	21	1.81%	1	4.17%
adam barth	adam barth	4	0.34%	1	4.17%
daniel borkmann	daniel borkmann	2	0.17%	1	4.17%
	Total	1161	100.00%	24	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 samples/bpf/bpf_helpers.h

Overall Contributors
