1 #include <linux/unistd.h>
12 #include <sys/types.h>
13 #include <sys/socket.h>
17 #include <bpf/libbpf.h>
19 #include "sock_example.h"
22 #define BPF_F_PIN (1 << 0)
23 #define BPF_F_GET (1 << 1)
24 #define BPF_F_PIN_GET (BPF_F_PIN | BPF_F_GET)
26 #define BPF_F_KEY (1 << 2)
27 #define BPF_F_VAL (1 << 3)
28 #define BPF_F_KEY_VAL (BPF_F_KEY | BPF_F_VAL)
30 #define BPF_M_UNSPEC 0
34 char bpf_log_buf[BPF_LOG_BUF_SIZE];
36 static void usage(void)
38 printf("Usage: fds_example [...]\n");
39 printf(" -F <file> File to pin/get object\n");
40 printf(" -P |- pin object\n");
41 printf(" -G `- get object\n");
42 printf(" -m eBPF map mode\n");
43 printf(" -k <key> |- map key\n");
44 printf(" -v <value> `- map value\n");
45 printf(" -p eBPF prog mode\n");
46 printf(" -o <object> `- object file\n");
47 printf(" -h Display this help.\n");
50 static int bpf_prog_create(const char *object)
52 static struct bpf_insn insns[] = {
53 BPF_MOV64_IMM(BPF_REG_0, 1),
56 size_t insns_cnt = ARRAY_SIZE(insns);
57 struct bpf_object *obj;
61 obj = bpf_object__open_file(object, NULL);
62 assert(!libbpf_get_error(obj));
63 err = bpf_object__load(obj);
65 return bpf_program__fd(bpf_object__next_program(obj, NULL));
67 LIBBPF_OPTS(bpf_prog_load_opts, opts,
68 .log_buf = bpf_log_buf,
69 .log_size = BPF_LOG_BUF_SIZE,
72 return bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, NULL, "GPL",
73 insns, insns_cnt, &opts);
77 static int bpf_do_map(const char *file, uint32_t flags, uint32_t key,
82 if (flags & BPF_F_PIN) {
83 fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(uint32_t),
84 sizeof(uint32_t), 1024, NULL);
85 printf("bpf: map fd:%d (%s)\n", fd, strerror(errno));
88 ret = bpf_obj_pin(fd, file);
89 printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
92 fd = bpf_obj_get(file);
93 printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
97 if ((flags & BPF_F_KEY_VAL) == BPF_F_KEY_VAL) {
98 ret = bpf_map_update_elem(fd, &key, &value, 0);
99 printf("bpf: fd:%d u->(%u:%u) ret:(%d,%s)\n", fd, key, value,
100 ret, strerror(errno));
102 } else if (flags & BPF_F_KEY) {
103 ret = bpf_map_lookup_elem(fd, &key, &value);
104 printf("bpf: fd:%d l->(%u):%u ret:(%d,%s)\n", fd, key, value,
105 ret, strerror(errno));
112 static int bpf_do_prog(const char *file, uint32_t flags, const char *object)
116 if (flags & BPF_F_PIN) {
117 fd = bpf_prog_create(object);
118 printf("bpf: prog fd:%d (%s)\n", fd, strerror(errno));
121 ret = bpf_obj_pin(fd, file);
122 printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
125 fd = bpf_obj_get(file);
126 printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
130 sock = open_raw_sock("lo");
133 ret = setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &fd, sizeof(fd));
134 printf("bpf: sock:%d <- fd:%d attached ret:(%d,%s)\n", sock, fd,
135 ret, strerror(errno));
141 int main(int argc, char **argv)
143 const char *file = NULL, *object = NULL;
144 uint32_t key = 0, value = 0, flags = 0;
145 int opt, mode = BPF_M_UNSPEC;
147 while ((opt = getopt(argc, argv, "F:PGmk:v:po:")) != -1) {
159 /* Map-related args */
164 key = strtoul(optarg, NULL, 0);
168 value = strtoul(optarg, NULL, 0);
171 /* Prog-related args */
183 if (!(flags & BPF_F_PIN_GET) || !file)
188 return bpf_do_map(file, flags, key, value);
190 return bpf_do_prog(file, flags, object);