1 #include <linux/unistd.h>
12 #include <sys/types.h>
13 #include <sys/socket.h>
19 #include "sock_example.h"
21 #define BPF_F_PIN (1 << 0)
22 #define BPF_F_GET (1 << 1)
23 #define BPF_F_PIN_GET (BPF_F_PIN | BPF_F_GET)
25 #define BPF_F_KEY (1 << 2)
26 #define BPF_F_VAL (1 << 3)
27 #define BPF_F_KEY_VAL (BPF_F_KEY | BPF_F_VAL)
29 #define BPF_M_UNSPEC 0
33 static void usage(void)
35 printf("Usage: fds_example [...]\n");
36 printf(" -F <file> File to pin/get object\n");
37 printf(" -P |- pin object\n");
38 printf(" -G `- get object\n");
39 printf(" -m eBPF map mode\n");
40 printf(" -k <key> |- map key\n");
41 printf(" -v <value> `- map value\n");
42 printf(" -p eBPF prog mode\n");
43 printf(" -o <object> `- object file\n");
44 printf(" -h Display this help.\n");
47 static int bpf_map_create(void)
49 return bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(uint32_t),
50 sizeof(uint32_t), 1024, 0);
53 static int bpf_prog_create(const char *object)
55 static struct bpf_insn insns[] = {
56 BPF_MOV64_IMM(BPF_REG_0, 1),
59 size_t insns_cnt = sizeof(insns) / sizeof(struct bpf_insn);
60 char bpf_log_buf[BPF_LOG_BUF_SIZE];
61 struct bpf_object *obj;
65 assert(!bpf_prog_load(object, BPF_PROG_TYPE_UNSPEC,
69 return bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER,
70 insns, insns_cnt, "GPL", 0,
71 bpf_log_buf, BPF_LOG_BUF_SIZE);
75 static int bpf_do_map(const char *file, uint32_t flags, uint32_t key,
80 if (flags & BPF_F_PIN) {
81 fd = bpf_map_create();
82 printf("bpf: map fd:%d (%s)\n", fd, strerror(errno));
85 ret = bpf_obj_pin(fd, file);
86 printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
89 fd = bpf_obj_get(file);
90 printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
94 if ((flags & BPF_F_KEY_VAL) == BPF_F_KEY_VAL) {
95 ret = bpf_map_update_elem(fd, &key, &value, 0);
96 printf("bpf: fd:%d u->(%u:%u) ret:(%d,%s)\n", fd, key, value,
97 ret, strerror(errno));
99 } else if (flags & BPF_F_KEY) {
100 ret = bpf_map_lookup_elem(fd, &key, &value);
101 printf("bpf: fd:%d l->(%u):%u ret:(%d,%s)\n", fd, key, value,
102 ret, strerror(errno));
109 static int bpf_do_prog(const char *file, uint32_t flags, const char *object)
113 if (flags & BPF_F_PIN) {
114 fd = bpf_prog_create(object);
115 printf("bpf: prog fd:%d (%s)\n", fd, strerror(errno));
118 ret = bpf_obj_pin(fd, file);
119 printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
122 fd = bpf_obj_get(file);
123 printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
127 sock = open_raw_sock("lo");
130 ret = setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &fd, sizeof(fd));
131 printf("bpf: sock:%d <- fd:%d attached ret:(%d,%s)\n", sock, fd,
132 ret, strerror(errno));
138 int main(int argc, char **argv)
140 const char *file = NULL, *object = NULL;
141 uint32_t key = 0, value = 0, flags = 0;
142 int opt, mode = BPF_M_UNSPEC;
144 while ((opt = getopt(argc, argv, "F:PGmk:v:po:")) != -1) {
156 /* Map-related args */
161 key = strtoul(optarg, NULL, 0);
165 value = strtoul(optarg, NULL, 0);
168 /* Prog-related args */
180 if (!(flags & BPF_F_PIN_GET) || !file)
185 return bpf_do_map(file, flags, key, value);
187 return bpf_do_prog(file, flags, object);