Blame view
samples/bpf/fds_example.c
4.24 KB
42984d7c1
bpf: add sample u...
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
#include <linux/unistd.h> #include <linux/bpf.h> #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <unistd.h> #include <string.h> #include <assert.h> #include <errno.h> #include <sys/types.h> #include <sys/socket.h> |
8d9304507
samples: bpf: ren...
|
14 |
#include <bpf/bpf.h> |
7cf245a37
samples/bpf: Use ...
|
15 |
#include <bpf/libbpf.h> |
|
8d9304507
samples: bpf: ren...
|
16 |
#include "bpf_insn.h" |
9899694a7
samples/bpf: Move...
|
17 |
#include "sock_example.h" |
|
42984d7c1
bpf: add sample u...
|
18 19 20 21 22 23 24 25 26 27 28 29 |
#define BPF_F_PIN (1 << 0) #define BPF_F_GET (1 << 1) #define BPF_F_PIN_GET (BPF_F_PIN | BPF_F_GET) #define BPF_F_KEY (1 << 2) #define BPF_F_VAL (1 << 3) #define BPF_F_KEY_VAL (BPF_F_KEY | BPF_F_VAL) #define BPF_M_UNSPEC 0 #define BPF_M_MAP 1 #define BPF_M_PROG 2 |
eef8a42d6
bpf: Fix fds_exam...
|
30 |
char bpf_log_buf[BPF_LOG_BUF_SIZE]; |
|
42984d7c1
bpf: add sample u...
|
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 |
static void usage(void)
{
printf("Usage: fds_example [...]
");
printf(" -F <file> File to pin/get object
");
printf(" -P |- pin object
");
printf(" -G `- get object
");
printf(" -m eBPF map mode
");
printf(" -k <key> |- map key
");
printf(" -v <value> `- map value
");
printf(" -p eBPF prog mode
");
printf(" -o <object> `- object file
");
printf(" -h Display this help.
");
}
static int bpf_map_create(void)
{
return bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(uint32_t),
|
89b976070
samples/bpf: add ...
|
58 |
sizeof(uint32_t), 1024, 0); |
|
42984d7c1
bpf: add sample u...
|
59 60 61 62 |
}
static int bpf_prog_create(const char *object)
{
|
811b4f0d7
samples/bpf: Be c...
|
63 |
static struct bpf_insn insns[] = {
|
|
42984d7c1
bpf: add sample u...
|
64 65 66 |
BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }; |
|
43371c83f
samples/bpf: Swit...
|
67 |
size_t insns_cnt = sizeof(insns) / sizeof(struct bpf_insn); |
|
1a9b268c9
samples: bpf: use...
|
68 69 |
struct bpf_object *obj; int prog_fd; |
|
42984d7c1
bpf: add sample u...
|
70 71 |
if (object) {
|
|
1a9b268c9
samples: bpf: use...
|
72 73 74 |
assert(!bpf_prog_load(object, BPF_PROG_TYPE_UNSPEC, &obj, &prog_fd)); return prog_fd; |
|
42984d7c1
bpf: add sample u...
|
75 |
} else {
|
|
d40fc181e
samples/bpf: Make...
|
76 |
return bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER, |
|
43371c83f
samples/bpf: Swit...
|
77 |
insns, insns_cnt, "GPL", 0, |
|
d40fc181e
samples/bpf: Make...
|
78 |
bpf_log_buf, BPF_LOG_BUF_SIZE); |
|
42984d7c1
bpf: add sample u...
|
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 |
}
}
static int bpf_do_map(const char *file, uint32_t flags, uint32_t key,
uint32_t value)
{
int fd, ret;
if (flags & BPF_F_PIN) {
fd = bpf_map_create();
printf("bpf: map fd:%d (%s)
", fd, strerror(errno));
assert(fd > 0);
ret = bpf_obj_pin(fd, file);
printf("bpf: pin ret:(%d,%s)
", ret, strerror(errno));
assert(ret == 0);
} else {
fd = bpf_obj_get(file);
printf("bpf: get fd:%d (%s)
", fd, strerror(errno));
assert(fd > 0);
}
if ((flags & BPF_F_KEY_VAL) == BPF_F_KEY_VAL) {
|
|
d40fc181e
samples/bpf: Make...
|
105 |
ret = bpf_map_update_elem(fd, &key, &value, 0); |
|
42984d7c1
bpf: add sample u...
|
106 107 108 109 110 |
printf("bpf: fd:%d u->(%u:%u) ret:(%d,%s)
", fd, key, value,
ret, strerror(errno));
assert(ret == 0);
} else if (flags & BPF_F_KEY) {
|
|
d40fc181e
samples/bpf: Make...
|
111 |
ret = bpf_map_lookup_elem(fd, &key, &value); |
|
42984d7c1
bpf: add sample u...
|
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 |
printf("bpf: fd:%d l->(%u):%u ret:(%d,%s)
", fd, key, value,
ret, strerror(errno));
assert(ret == 0);
}
return 0;
}
static int bpf_do_prog(const char *file, uint32_t flags, const char *object)
{
int fd, sock, ret;
if (flags & BPF_F_PIN) {
fd = bpf_prog_create(object);
printf("bpf: prog fd:%d (%s)
", fd, strerror(errno));
assert(fd > 0);
ret = bpf_obj_pin(fd, file);
printf("bpf: pin ret:(%d,%s)
", ret, strerror(errno));
assert(ret == 0);
} else {
fd = bpf_obj_get(file);
printf("bpf: get fd:%d (%s)
", fd, strerror(errno));
assert(fd > 0);
}
sock = open_raw_sock("lo");
assert(sock > 0);
ret = setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &fd, sizeof(fd));
printf("bpf: sock:%d <- fd:%d attached ret:(%d,%s)
", sock, fd,
ret, strerror(errno));
assert(ret == 0);
return 0;
}
int main(int argc, char **argv)
{
const char *file = NULL, *object = NULL;
uint32_t key = 0, value = 0, flags = 0;
int opt, mode = BPF_M_UNSPEC;
while ((opt = getopt(argc, argv, "F:PGmk:v:po:")) != -1) {
switch (opt) {
/* General args */
case 'F':
file = optarg;
break;
case 'P':
flags |= BPF_F_PIN;
break;
case 'G':
flags |= BPF_F_GET;
break;
/* Map-related args */
case 'm':
mode = BPF_M_MAP;
break;
case 'k':
key = strtoul(optarg, NULL, 0);
flags |= BPF_F_KEY;
break;
case 'v':
value = strtoul(optarg, NULL, 0);
flags |= BPF_F_VAL;
break;
/* Prog-related args */
case 'p':
mode = BPF_M_PROG;
break;
case 'o':
object = optarg;
break;
default:
goto out;
}
}
if (!(flags & BPF_F_PIN_GET) || !file)
goto out;
switch (mode) {
case BPF_M_MAP:
return bpf_do_map(file, flags, key, value);
case BPF_M_PROG:
return bpf_do_prog(file, flags, object);
}
out:
usage();
return -1;
}
|