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Linux kernel mirror (for testing)
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linux
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 */
11static void *(*bpf_map_lookup_elem)(void *map, void *key) =
12 (void *) BPF_FUNC_map_lookup_elem;
13static int (*bpf_map_update_elem)(void *map, void *key, void *value,
14 unsigned long long flags) =
15 (void *) BPF_FUNC_map_update_elem;
16static int (*bpf_map_delete_elem)(void *map, void *key) =
17 (void *) BPF_FUNC_map_delete_elem;
18static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
19 (void *) BPF_FUNC_probe_read;
20static unsigned long long (*bpf_ktime_get_ns)(void) =
21 (void *) BPF_FUNC_ktime_get_ns;
22static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
23 (void *) BPF_FUNC_trace_printk;
24static void (*bpf_tail_call)(void *ctx, void *map, int index) =
25 (void *) BPF_FUNC_tail_call;
26static unsigned long long (*bpf_get_smp_processor_id)(void) =
27 (void *) BPF_FUNC_get_smp_processor_id;
28static unsigned long long (*bpf_get_current_pid_tgid)(void) =
29 (void *) BPF_FUNC_get_current_pid_tgid;
30static unsigned long long (*bpf_get_current_uid_gid)(void) =
31 (void *) BPF_FUNC_get_current_uid_gid;
32static int (*bpf_get_current_comm)(void *buf, int buf_size) =
33 (void *) BPF_FUNC_get_current_comm;
34static unsigned long long (*bpf_perf_event_read)(void *map,
35 unsigned long long flags) =
36 (void *) BPF_FUNC_perf_event_read;
37static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
38 (void *) BPF_FUNC_clone_redirect;
39static int (*bpf_redirect)(int ifindex, int flags) =
40 (void *) BPF_FUNC_redirect;
41static int (*bpf_perf_event_output)(void *ctx, void *map,
42 unsigned long long flags, void *data,
43 int size) =
44 (void *) BPF_FUNC_perf_event_output;
45static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
46 (void *) BPF_FUNC_get_stackid;
47static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
48 (void *) BPF_FUNC_probe_write_user;
49static int (*bpf_current_task_under_cgroup)(void *map, int index) =
50 (void *) BPF_FUNC_current_task_under_cgroup;
51static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
52 (void *) BPF_FUNC_skb_get_tunnel_key;
53static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
54 (void *) BPF_FUNC_skb_set_tunnel_key;
55static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
56 (void *) BPF_FUNC_skb_get_tunnel_opt;
57static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
58 (void *) BPF_FUNC_skb_set_tunnel_opt;
59static unsigned long long (*bpf_get_prandom_u32)(void) =
60 (void *) BPF_FUNC_get_prandom_u32;
61static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
62 (void *) BPF_FUNC_xdp_adjust_head;
63static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
64 int optlen) =
65 (void *) BPF_FUNC_setsockopt;
66
67/* llvm builtin functions that eBPF C program may use to
68 * emit BPF_LD_ABS and BPF_LD_IND instructions
69 */
70struct sk_buff;
71unsigned long long load_byte(void *skb,
72 unsigned long long off) asm("llvm.bpf.load.byte");
73unsigned long long load_half(void *skb,
74 unsigned long long off) asm("llvm.bpf.load.half");
75unsigned long long load_word(void *skb,
76 unsigned long long off) asm("llvm.bpf.load.word");
77
78/* a helper structure used by eBPF C program
79 * to describe map attributes to elf_bpf loader
80 */
81struct bpf_map_def {
82 unsigned int type;
83 unsigned int key_size;
84 unsigned int value_size;
85 unsigned int max_entries;
86 unsigned int map_flags;
87 unsigned int inner_map_idx;
88};
89
90static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
91 (void *) BPF_FUNC_skb_load_bytes;
92static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
93 (void *) BPF_FUNC_skb_store_bytes;
94static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
95 (void *) BPF_FUNC_l3_csum_replace;
96static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
97 (void *) BPF_FUNC_l4_csum_replace;
98static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
99 (void *) BPF_FUNC_skb_under_cgroup;
100static int (*bpf_skb_change_head)(void *, int len, int flags) =
101 (void *) BPF_FUNC_skb_change_head;
102
103#if defined(__x86_64__)
104
105#define PT_REGS_PARM1(x) ((x)->di)
106#define PT_REGS_PARM2(x) ((x)->si)
107#define PT_REGS_PARM3(x) ((x)->dx)
108#define PT_REGS_PARM4(x) ((x)->cx)
109#define PT_REGS_PARM5(x) ((x)->r8)
110#define PT_REGS_RET(x) ((x)->sp)
111#define PT_REGS_FP(x) ((x)->bp)
112#define PT_REGS_RC(x) ((x)->ax)
113#define PT_REGS_SP(x) ((x)->sp)
114#define PT_REGS_IP(x) ((x)->ip)
115
116#elif defined(__s390x__)
117
118#define PT_REGS_PARM1(x) ((x)->gprs[2])
119#define PT_REGS_PARM2(x) ((x)->gprs[3])
120#define PT_REGS_PARM3(x) ((x)->gprs[4])
121#define PT_REGS_PARM4(x) ((x)->gprs[5])
122#define PT_REGS_PARM5(x) ((x)->gprs[6])
123#define PT_REGS_RET(x) ((x)->gprs[14])
124#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
125#define PT_REGS_RC(x) ((x)->gprs[2])
126#define PT_REGS_SP(x) ((x)->gprs[15])
127#define PT_REGS_IP(x) ((x)->psw.addr)
128
129#elif defined(__aarch64__)
130
131#define PT_REGS_PARM1(x) ((x)->regs[0])
132#define PT_REGS_PARM2(x) ((x)->regs[1])
133#define PT_REGS_PARM3(x) ((x)->regs[2])
134#define PT_REGS_PARM4(x) ((x)->regs[3])
135#define PT_REGS_PARM5(x) ((x)->regs[4])
136#define PT_REGS_RET(x) ((x)->regs[30])
137#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
138#define PT_REGS_RC(x) ((x)->regs[0])
139#define PT_REGS_SP(x) ((x)->sp)
140#define PT_REGS_IP(x) ((x)->pc)
141
142#elif defined(__mips__)
143
144#define PT_REGS_PARM1(x) ((x)->regs[4])
145#define PT_REGS_PARM2(x) ((x)->regs[5])
146#define PT_REGS_PARM3(x) ((x)->regs[6])
147#define PT_REGS_PARM4(x) ((x)->regs[7])
148#define PT_REGS_PARM5(x) ((x)->regs[8])
149#define PT_REGS_RET(x) ((x)->regs[31])
150#define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
151#define PT_REGS_RC(x) ((x)->regs[1])
152#define PT_REGS_SP(x) ((x)->regs[29])
153#define PT_REGS_IP(x) ((x)->cp0_epc)
154
155#elif defined(__powerpc__)
156
157#define PT_REGS_PARM1(x) ((x)->gpr[3])
158#define PT_REGS_PARM2(x) ((x)->gpr[4])
159#define PT_REGS_PARM3(x) ((x)->gpr[5])
160#define PT_REGS_PARM4(x) ((x)->gpr[6])
161#define PT_REGS_PARM5(x) ((x)->gpr[7])
162#define PT_REGS_RC(x) ((x)->gpr[3])
163#define PT_REGS_SP(x) ((x)->sp)
164#define PT_REGS_IP(x) ((x)->nip)
165
166#elif defined(__sparc__)
167
168#define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
169#define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
170#define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
171#define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
172#define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
173#define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
174#define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
175#define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
176#if defined(__arch64__)
177#define PT_REGS_IP(x) ((x)->tpc)
178#else
179#define PT_REGS_IP(x) ((x)->pc)
180#endif
181
182#endif
183
184#ifdef __powerpc__
185#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
186#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
187#elif defined(__sparc__)
188#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
189#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
190#else
191#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
192 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
193#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
194 bpf_probe_read(&(ip), sizeof(ip), \
195 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
196#endif
197
198#endif