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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __BPF_HELPERS_H
3#define __BPF_HELPERS_H
4
5/* helper macro to place programs, maps, license in
6 * different sections in elf_bpf file. Section names
7 * are interpreted by elf_bpf loader
8 */
9#define SEC(NAME) __attribute__((section(NAME), used))
10
11/* helper functions called from eBPF programs written in C */
12static void *(*bpf_map_lookup_elem)(void *map, void *key) =
13 (void *) BPF_FUNC_map_lookup_elem;
14static int (*bpf_map_update_elem)(void *map, void *key, void *value,
15 unsigned long long flags) =
16 (void *) BPF_FUNC_map_update_elem;
17static int (*bpf_map_delete_elem)(void *map, void *key) =
18 (void *) BPF_FUNC_map_delete_elem;
19static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
20 (void *) BPF_FUNC_probe_read;
21static unsigned long long (*bpf_ktime_get_ns)(void) =
22 (void *) BPF_FUNC_ktime_get_ns;
23static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
24 (void *) BPF_FUNC_trace_printk;
25static void (*bpf_tail_call)(void *ctx, void *map, int index) =
26 (void *) BPF_FUNC_tail_call;
27static unsigned long long (*bpf_get_smp_processor_id)(void) =
28 (void *) BPF_FUNC_get_smp_processor_id;
29static unsigned long long (*bpf_get_current_pid_tgid)(void) =
30 (void *) BPF_FUNC_get_current_pid_tgid;
31static unsigned long long (*bpf_get_current_uid_gid)(void) =
32 (void *) BPF_FUNC_get_current_uid_gid;
33static int (*bpf_get_current_comm)(void *buf, int buf_size) =
34 (void *) BPF_FUNC_get_current_comm;
35static unsigned long long (*bpf_perf_event_read)(void *map,
36 unsigned long long flags) =
37 (void *) BPF_FUNC_perf_event_read;
38static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
39 (void *) BPF_FUNC_clone_redirect;
40static int (*bpf_redirect)(int ifindex, int flags) =
41 (void *) BPF_FUNC_redirect;
42static int (*bpf_redirect_map)(void *map, int key, int flags) =
43 (void *) BPF_FUNC_redirect_map;
44static int (*bpf_perf_event_output)(void *ctx, void *map,
45 unsigned long long flags, void *data,
46 int size) =
47 (void *) BPF_FUNC_perf_event_output;
48static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
49 (void *) BPF_FUNC_get_stackid;
50static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
51 (void *) BPF_FUNC_probe_write_user;
52static int (*bpf_current_task_under_cgroup)(void *map, int index) =
53 (void *) BPF_FUNC_current_task_under_cgroup;
54static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
55 (void *) BPF_FUNC_skb_get_tunnel_key;
56static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
57 (void *) BPF_FUNC_skb_set_tunnel_key;
58static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
59 (void *) BPF_FUNC_skb_get_tunnel_opt;
60static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
61 (void *) BPF_FUNC_skb_set_tunnel_opt;
62static unsigned long long (*bpf_get_prandom_u32)(void) =
63 (void *) BPF_FUNC_get_prandom_u32;
64static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
65 (void *) BPF_FUNC_xdp_adjust_head;
66static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) =
67 (void *) BPF_FUNC_xdp_adjust_meta;
68static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
69 int optlen) =
70 (void *) BPF_FUNC_setsockopt;
71static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval,
72 int optlen) =
73 (void *) BPF_FUNC_getsockopt;
74static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) =
75 (void *) BPF_FUNC_sock_ops_cb_flags_set;
76static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) =
77 (void *) BPF_FUNC_sk_redirect_map;
78static int (*bpf_sock_map_update)(void *map, void *key, void *value,
79 unsigned long long flags) =
80 (void *) BPF_FUNC_sock_map_update;
81static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags,
82 void *buf, unsigned int buf_size) =
83 (void *) BPF_FUNC_perf_event_read_value;
84static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
85 unsigned int buf_size) =
86 (void *) BPF_FUNC_perf_prog_read_value;
87static int (*bpf_override_return)(void *ctx, unsigned long rc) =
88 (void *) BPF_FUNC_override_return;
89static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) =
90 (void *) BPF_FUNC_msg_redirect_map;
91static int (*bpf_msg_apply_bytes)(void *ctx, int len) =
92 (void *) BPF_FUNC_msg_apply_bytes;
93static int (*bpf_msg_cork_bytes)(void *ctx, int len) =
94 (void *) BPF_FUNC_msg_cork_bytes;
95static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) =
96 (void *) BPF_FUNC_msg_pull_data;
97static int (*bpf_bind)(void *ctx, void *addr, int addr_len) =
98 (void *) BPF_FUNC_bind;
99
100/* llvm builtin functions that eBPF C program may use to
101 * emit BPF_LD_ABS and BPF_LD_IND instructions
102 */
103struct sk_buff;
104unsigned long long load_byte(void *skb,
105 unsigned long long off) asm("llvm.bpf.load.byte");
106unsigned long long load_half(void *skb,
107 unsigned long long off) asm("llvm.bpf.load.half");
108unsigned long long load_word(void *skb,
109 unsigned long long off) asm("llvm.bpf.load.word");
110
111/* a helper structure used by eBPF C program
112 * to describe map attributes to elf_bpf loader
113 */
114struct bpf_map_def {
115 unsigned int type;
116 unsigned int key_size;
117 unsigned int value_size;
118 unsigned int max_entries;
119 unsigned int map_flags;
120 unsigned int inner_map_idx;
121 unsigned int numa_node;
122};
123
124static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
125 (void *) BPF_FUNC_skb_load_bytes;
126static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
127 (void *) BPF_FUNC_skb_store_bytes;
128static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
129 (void *) BPF_FUNC_l3_csum_replace;
130static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
131 (void *) BPF_FUNC_l4_csum_replace;
132static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
133 (void *) BPF_FUNC_skb_under_cgroup;
134static int (*bpf_skb_change_head)(void *, int len, int flags) =
135 (void *) BPF_FUNC_skb_change_head;
136static int (*bpf_skb_pull_data)(void *, int len) =
137 (void *) BPF_FUNC_skb_pull_data;
138
139/* Scan the ARCH passed in from ARCH env variable (see Makefile) */
140#if defined(__TARGET_ARCH_x86)
141 #define bpf_target_x86
142 #define bpf_target_defined
143#elif defined(__TARGET_ARCH_s930x)
144 #define bpf_target_s930x
145 #define bpf_target_defined
146#elif defined(__TARGET_ARCH_arm64)
147 #define bpf_target_arm64
148 #define bpf_target_defined
149#elif defined(__TARGET_ARCH_mips)
150 #define bpf_target_mips
151 #define bpf_target_defined
152#elif defined(__TARGET_ARCH_powerpc)
153 #define bpf_target_powerpc
154 #define bpf_target_defined
155#elif defined(__TARGET_ARCH_sparc)
156 #define bpf_target_sparc
157 #define bpf_target_defined
158#else
159 #undef bpf_target_defined
160#endif
161
162/* Fall back to what the compiler says */
163#ifndef bpf_target_defined
164#if defined(__x86_64__)
165 #define bpf_target_x86
166#elif defined(__s390x__)
167 #define bpf_target_s930x
168#elif defined(__aarch64__)
169 #define bpf_target_arm64
170#elif defined(__mips__)
171 #define bpf_target_mips
172#elif defined(__powerpc__)
173 #define bpf_target_powerpc
174#elif defined(__sparc__)
175 #define bpf_target_sparc
176#endif
177#endif
178
179#if defined(bpf_target_x86)
180
181#define PT_REGS_PARM1(x) ((x)->di)
182#define PT_REGS_PARM2(x) ((x)->si)
183#define PT_REGS_PARM3(x) ((x)->dx)
184#define PT_REGS_PARM4(x) ((x)->cx)
185#define PT_REGS_PARM5(x) ((x)->r8)
186#define PT_REGS_RET(x) ((x)->sp)
187#define PT_REGS_FP(x) ((x)->bp)
188#define PT_REGS_RC(x) ((x)->ax)
189#define PT_REGS_SP(x) ((x)->sp)
190#define PT_REGS_IP(x) ((x)->ip)
191
192#elif defined(bpf_target_s390x)
193
194#define PT_REGS_PARM1(x) ((x)->gprs[2])
195#define PT_REGS_PARM2(x) ((x)->gprs[3])
196#define PT_REGS_PARM3(x) ((x)->gprs[4])
197#define PT_REGS_PARM4(x) ((x)->gprs[5])
198#define PT_REGS_PARM5(x) ((x)->gprs[6])
199#define PT_REGS_RET(x) ((x)->gprs[14])
200#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
201#define PT_REGS_RC(x) ((x)->gprs[2])
202#define PT_REGS_SP(x) ((x)->gprs[15])
203#define PT_REGS_IP(x) ((x)->psw.addr)
204
205#elif defined(bpf_target_arm64)
206
207#define PT_REGS_PARM1(x) ((x)->regs[0])
208#define PT_REGS_PARM2(x) ((x)->regs[1])
209#define PT_REGS_PARM3(x) ((x)->regs[2])
210#define PT_REGS_PARM4(x) ((x)->regs[3])
211#define PT_REGS_PARM5(x) ((x)->regs[4])
212#define PT_REGS_RET(x) ((x)->regs[30])
213#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
214#define PT_REGS_RC(x) ((x)->regs[0])
215#define PT_REGS_SP(x) ((x)->sp)
216#define PT_REGS_IP(x) ((x)->pc)
217
218#elif defined(bpf_target_mips)
219
220#define PT_REGS_PARM1(x) ((x)->regs[4])
221#define PT_REGS_PARM2(x) ((x)->regs[5])
222#define PT_REGS_PARM3(x) ((x)->regs[6])
223#define PT_REGS_PARM4(x) ((x)->regs[7])
224#define PT_REGS_PARM5(x) ((x)->regs[8])
225#define PT_REGS_RET(x) ((x)->regs[31])
226#define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
227#define PT_REGS_RC(x) ((x)->regs[1])
228#define PT_REGS_SP(x) ((x)->regs[29])
229#define PT_REGS_IP(x) ((x)->cp0_epc)
230
231#elif defined(bpf_target_powerpc)
232
233#define PT_REGS_PARM1(x) ((x)->gpr[3])
234#define PT_REGS_PARM2(x) ((x)->gpr[4])
235#define PT_REGS_PARM3(x) ((x)->gpr[5])
236#define PT_REGS_PARM4(x) ((x)->gpr[6])
237#define PT_REGS_PARM5(x) ((x)->gpr[7])
238#define PT_REGS_RC(x) ((x)->gpr[3])
239#define PT_REGS_SP(x) ((x)->sp)
240#define PT_REGS_IP(x) ((x)->nip)
241
242#elif defined(bpf_target_sparc)
243
244#define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
245#define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
246#define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
247#define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
248#define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
249#define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
250#define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
251#define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
252
253/* Should this also be a bpf_target check for the sparc case? */
254#if defined(__arch64__)
255#define PT_REGS_IP(x) ((x)->tpc)
256#else
257#define PT_REGS_IP(x) ((x)->pc)
258#endif
259
260#endif
261
262#ifdef bpf_target_powerpc
263#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
264#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
265#elif bpf_target_sparc
266#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
267#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
268#else
269#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
270 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
271#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
272 bpf_probe_read(&(ip), sizeof(ip), \
273 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
274#endif
275
276#endif