1 #ifndef __BPF_HELPERS_H
2 #define __BPF_HELPERS_H
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
8 #define SEC(NAME) __attribute__((section(NAME), used))
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;
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;
24 static void (*bpf_tail_call)(void *ctx, void *map, int index) =
25 (void *) BPF_FUNC_tail_call;
26 static unsigned long long (*bpf_get_smp_processor_id)(void) =
27 (void *) BPF_FUNC_get_smp_processor_id;
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;
34 static unsigned long long (*bpf_perf_event_read)(void *map,
35 unsigned long long flags) =
36 (void *) BPF_FUNC_perf_event_read;
37 static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
38 (void *) BPF_FUNC_clone_redirect;
39 static int (*bpf_redirect)(int ifindex, int flags) =
40 (void *) BPF_FUNC_redirect;
41 static int (*bpf_redirect_map)(void *map, int key, int flags) =
42 (void *) BPF_FUNC_redirect_map;
43 static int (*bpf_perf_event_output)(void *ctx, void *map,
44 unsigned long long flags, void *data,
46 (void *) BPF_FUNC_perf_event_output;
47 static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
48 (void *) BPF_FUNC_get_stackid;
49 static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
50 (void *) BPF_FUNC_probe_write_user;
51 static int (*bpf_current_task_under_cgroup)(void *map, int index) =
52 (void *) BPF_FUNC_current_task_under_cgroup;
53 static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
54 (void *) BPF_FUNC_skb_get_tunnel_key;
55 static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
56 (void *) BPF_FUNC_skb_set_tunnel_key;
57 static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
58 (void *) BPF_FUNC_skb_get_tunnel_opt;
59 static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
60 (void *) BPF_FUNC_skb_set_tunnel_opt;
61 static unsigned long long (*bpf_get_prandom_u32)(void) =
62 (void *) BPF_FUNC_get_prandom_u32;
63 static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
64 (void *) BPF_FUNC_xdp_adjust_head;
65 static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
67 (void *) BPF_FUNC_setsockopt;
68 static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) =
69 (void *) BPF_FUNC_sk_redirect_map;
70 static int (*bpf_sock_map_update)(void *map, void *key, void *value,
71 unsigned long long flags) =
72 (void *) BPF_FUNC_sock_map_update;
75 /* llvm builtin functions that eBPF C program may use to
76 * emit BPF_LD_ABS and BPF_LD_IND instructions
79 unsigned long long load_byte(void *skb,
80 unsigned long long off) asm("llvm.bpf.load.byte");
81 unsigned long long load_half(void *skb,
82 unsigned long long off) asm("llvm.bpf.load.half");
83 unsigned long long load_word(void *skb,
84 unsigned long long off) asm("llvm.bpf.load.word");
86 /* a helper structure used by eBPF C program
87 * to describe map attributes to elf_bpf loader
91 unsigned int key_size;
92 unsigned int value_size;
93 unsigned int max_entries;
94 unsigned int map_flags;
95 unsigned int inner_map_idx;
96 unsigned int numa_node;
99 static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
100 (void *) BPF_FUNC_skb_load_bytes;
101 static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
102 (void *) BPF_FUNC_skb_store_bytes;
103 static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
104 (void *) BPF_FUNC_l3_csum_replace;
105 static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
106 (void *) BPF_FUNC_l4_csum_replace;
107 static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
108 (void *) BPF_FUNC_skb_under_cgroup;
109 static int (*bpf_skb_change_head)(void *, int len, int flags) =
110 (void *) BPF_FUNC_skb_change_head;
112 #if defined(__x86_64__)
114 #define PT_REGS_PARM1(x) ((x)->di)
115 #define PT_REGS_PARM2(x) ((x)->si)
116 #define PT_REGS_PARM3(x) ((x)->dx)
117 #define PT_REGS_PARM4(x) ((x)->cx)
118 #define PT_REGS_PARM5(x) ((x)->r8)
119 #define PT_REGS_RET(x) ((x)->sp)
120 #define PT_REGS_FP(x) ((x)->bp)
121 #define PT_REGS_RC(x) ((x)->ax)
122 #define PT_REGS_SP(x) ((x)->sp)
123 #define PT_REGS_IP(x) ((x)->ip)
125 #elif defined(__s390x__)
127 #define PT_REGS_PARM1(x) ((x)->gprs[2])
128 #define PT_REGS_PARM2(x) ((x)->gprs[3])
129 #define PT_REGS_PARM3(x) ((x)->gprs[4])
130 #define PT_REGS_PARM4(x) ((x)->gprs[5])
131 #define PT_REGS_PARM5(x) ((x)->gprs[6])
132 #define PT_REGS_RET(x) ((x)->gprs[14])
133 #define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
134 #define PT_REGS_RC(x) ((x)->gprs[2])
135 #define PT_REGS_SP(x) ((x)->gprs[15])
136 #define PT_REGS_IP(x) ((x)->psw.addr)
138 #elif defined(__aarch64__)
140 #define PT_REGS_PARM1(x) ((x)->regs[0])
141 #define PT_REGS_PARM2(x) ((x)->regs[1])
142 #define PT_REGS_PARM3(x) ((x)->regs[2])
143 #define PT_REGS_PARM4(x) ((x)->regs[3])
144 #define PT_REGS_PARM5(x) ((x)->regs[4])
145 #define PT_REGS_RET(x) ((x)->regs[30])
146 #define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
147 #define PT_REGS_RC(x) ((x)->regs[0])
148 #define PT_REGS_SP(x) ((x)->sp)
149 #define PT_REGS_IP(x) ((x)->pc)
151 #elif defined(__mips__)
153 #define PT_REGS_PARM1(x) ((x)->regs[4])
154 #define PT_REGS_PARM2(x) ((x)->regs[5])
155 #define PT_REGS_PARM3(x) ((x)->regs[6])
156 #define PT_REGS_PARM4(x) ((x)->regs[7])
157 #define PT_REGS_PARM5(x) ((x)->regs[8])
158 #define PT_REGS_RET(x) ((x)->regs[31])
159 #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
160 #define PT_REGS_RC(x) ((x)->regs[1])
161 #define PT_REGS_SP(x) ((x)->regs[29])
162 #define PT_REGS_IP(x) ((x)->cp0_epc)
164 #elif defined(__powerpc__)
166 #define PT_REGS_PARM1(x) ((x)->gpr[3])
167 #define PT_REGS_PARM2(x) ((x)->gpr[4])
168 #define PT_REGS_PARM3(x) ((x)->gpr[5])
169 #define PT_REGS_PARM4(x) ((x)->gpr[6])
170 #define PT_REGS_PARM5(x) ((x)->gpr[7])
171 #define PT_REGS_RC(x) ((x)->gpr[3])
172 #define PT_REGS_SP(x) ((x)->sp)
173 #define PT_REGS_IP(x) ((x)->nip)
175 #elif defined(__sparc__)
177 #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
178 #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
179 #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
180 #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
181 #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
182 #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
183 #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
184 #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
185 #if defined(__arch64__)
186 #define PT_REGS_IP(x) ((x)->tpc)
188 #define PT_REGS_IP(x) ((x)->pc)
194 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
195 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
196 #elif defined(__sparc__)
197 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
198 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
200 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
201 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
202 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
203 bpf_probe_read(&(ip), sizeof(ip), \
204 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })