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