1 #include <time.h>
2 #include <stdio.h>
3 #include <errno.h>
4 #include <string.h>
5 #include <stdlib.h>
6 #include <stdio.h>
7 #include <stdint.h>
8 #include <unistd.h>
9 #include <ctype.h>
10 #include <sysexits.h>
11
12 #include "libbpf.h"
13
14 // TODO: Remove this when CentOS 6 support is not needed anymore
15 #ifndef CLOCK_BOOTTIME
16 #define CLOCK_BOOTTIME 7
17 #endif
18
19 static const char * const prog_type_strings[] = {
20 [BPF_PROG_TYPE_UNSPEC] = "unspec",
21 [BPF_PROG_TYPE_SOCKET_FILTER] = "socket filter",
22 [BPF_PROG_TYPE_KPROBE] = "kprobe",
23 [BPF_PROG_TYPE_SCHED_CLS] = "sched cls",
24 [BPF_PROG_TYPE_SCHED_ACT] = "sched act",
25 [BPF_PROG_TYPE_TRACEPOINT] = "tracepoint",
26 [BPF_PROG_TYPE_XDP] = "xdp",
27 [BPF_PROG_TYPE_PERF_EVENT] = "perf event",
28 [BPF_PROG_TYPE_CGROUP_SKB] = "cgroup skb",
29 [BPF_PROG_TYPE_CGROUP_SOCK] = "cgroup sock",
30 [BPF_PROG_TYPE_LWT_IN] = "lwt in",
31 [BPF_PROG_TYPE_LWT_OUT] = "lwt out",
32 [BPF_PROG_TYPE_LWT_XMIT] = "lwt xmit",
33 [BPF_PROG_TYPE_SOCK_OPS] = "sock ops",
34 [BPF_PROG_TYPE_SK_SKB] = "sk skb",
35 [BPF_PROG_TYPE_CGROUP_DEVICE] = "cgroup_device",
36 [BPF_PROG_TYPE_SK_MSG] = "sk_msg",
37 [BPF_PROG_TYPE_RAW_TRACEPOINT] = "raw_tracepoint",
38 [BPF_PROG_TYPE_CGROUP_SOCK_ADDR] = "cgroup_sock_addr",
39 [BPF_PROG_TYPE_LIRC_MODE2] = "lirc_mode2",
40 [BPF_PROG_TYPE_SK_REUSEPORT] = "sk_reuseport",
41 [BPF_PROG_TYPE_FLOW_DISSECTOR] = "flow_dissector",
42 };
43
44 static const char * const map_type_strings[] = {
45 [BPF_MAP_TYPE_UNSPEC] = "unspec",
46 [BPF_MAP_TYPE_HASH] = "hash",
47 [BPF_MAP_TYPE_ARRAY] = "array",
48 [BPF_MAP_TYPE_PROG_ARRAY] = "prog array",
49 [BPF_MAP_TYPE_PERF_EVENT_ARRAY] = "perf-ev array",
50 [BPF_MAP_TYPE_PERCPU_HASH] = "percpu hash",
51 [BPF_MAP_TYPE_PERCPU_ARRAY] = "percpu array",
52 [BPF_MAP_TYPE_STACK_TRACE] = "stack trace",
53 [BPF_MAP_TYPE_CGROUP_ARRAY] = "cgroup array",
54 [BPF_MAP_TYPE_LRU_HASH] = "lru hash",
55 [BPF_MAP_TYPE_LRU_PERCPU_HASH] = "lru percpu hash",
56 [BPF_MAP_TYPE_LPM_TRIE] = "lpm trie",
57 [BPF_MAP_TYPE_ARRAY_OF_MAPS] = "array of maps",
58 [BPF_MAP_TYPE_HASH_OF_MAPS] = "hash of maps",
59 [BPF_MAP_TYPE_DEVMAP] = "devmap",
60 [BPF_MAP_TYPE_SOCKMAP] = "sockmap",
61 [BPF_MAP_TYPE_CPUMAP] = "cpumap",
62 [BPF_MAP_TYPE_SOCKHASH] = "sockhash",
63 [BPF_MAP_TYPE_CGROUP_STORAGE] = "cgroup_storage",
64 [BPF_MAP_TYPE_REUSEPORT_SOCKARRAY] = "reuseport_sockarray",
65 [BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE] = "precpu_cgroup_storage",
66 [BPF_MAP_TYPE_QUEUE] = "queue",
67 [BPF_MAP_TYPE_STACK] = "stack",
68 };
69
70 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
71 #define LAST_KNOWN_PROG_TYPE (ARRAY_SIZE(prog_type_strings) - 1)
72 #define LAST_KNOWN_MAP_TYPE (ARRAY_SIZE(map_type_strings) - 1)
73 #define min(x, y) ((x) < (y) ? (x) : (y))
74
ptr_to_u64(const void * ptr)75 static inline uint64_t ptr_to_u64(const void *ptr)
76 {
77 return (uint64_t) (unsigned long) ptr;
78 }
79
u64_to_ptr(uint64_t ptr)80 static inline void * u64_to_ptr(uint64_t ptr)
81 {
82 return (void *) (unsigned long ) ptr;
83 }
84
handle_get_next_errno(int eno)85 static int handle_get_next_errno(int eno)
86 {
87 switch (eno) {
88 case ENOENT:
89 return 0;
90 case EINVAL:
91 fprintf(stderr, "Kernel does not support BPF introspection\n");
92 return EX_UNAVAILABLE;
93 case EPERM:
94 fprintf(stderr,
95 "Require CAP_SYS_ADMIN capability. Please retry as root\n");
96 return EX_NOPERM;
97 default:
98 fprintf(stderr, "%s\n", strerror(errno));
99 return 1;
100 }
101 }
102
print_prog_hdr(void)103 static void print_prog_hdr(void)
104 {
105 printf("%9s %-15s %8s %6s %-12s %-15s\n",
106 "BID", "TYPE", "UID", "#MAPS", "LoadTime", "NAME");
107 }
108
print_prog_info(const struct bpf_prog_info * prog_info)109 static void print_prog_info(const struct bpf_prog_info *prog_info)
110 {
111 struct timespec real_time_ts, boot_time_ts;
112 time_t wallclock_load_time = 0;
113 char unknown_prog_type[16];
114 const char *prog_type;
115 char load_time[16];
116 struct tm load_tm;
117
118 if (prog_info->type > LAST_KNOWN_PROG_TYPE) {
119 snprintf(unknown_prog_type, sizeof(unknown_prog_type), "<%u>",
120 prog_info->type);
121 unknown_prog_type[sizeof(unknown_prog_type) - 1] = '\0';
122 prog_type = unknown_prog_type;
123 } else {
124 prog_type = prog_type_strings[prog_info->type];
125 }
126
127 if (!clock_gettime(CLOCK_REALTIME, &real_time_ts) &&
128 !clock_gettime(CLOCK_BOOTTIME, &boot_time_ts) &&
129 real_time_ts.tv_sec >= boot_time_ts.tv_sec)
130 wallclock_load_time =
131 (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
132 prog_info->load_time / 1000000000;
133
134 if (wallclock_load_time && localtime_r(&wallclock_load_time, &load_tm))
135 strftime(load_time, sizeof(load_time), "%b%d/%H:%M", &load_tm);
136 else
137 snprintf(load_time, sizeof(load_time), "<%llu>",
138 prog_info->load_time / 1000000000);
139 load_time[sizeof(load_time) - 1] = '\0';
140
141 if (prog_info->jited_prog_len)
142 printf("%9u %-15s %8u %6u %-12s %-15s\n",
143 prog_info->id, prog_type, prog_info->created_by_uid,
144 prog_info->nr_map_ids, load_time, prog_info->name);
145 else
146 printf("%8u- %-15s %8u %6u %-12s %-15s\n",
147 prog_info->id, prog_type, prog_info->created_by_uid,
148 prog_info->nr_map_ids, load_time, prog_info->name);
149 }
150
print_map_hdr(void)151 static void print_map_hdr(void)
152 {
153 printf("%8s %-15s %-10s %8s %8s %8s %-15s\n",
154 "MID", "TYPE", "FLAGS", "KeySz", "ValueSz", "MaxEnts",
155 "NAME");
156 }
157
print_map_info(const struct bpf_map_info * map_info)158 static void print_map_info(const struct bpf_map_info *map_info)
159 {
160 char unknown_map_type[16];
161 const char *map_type;
162
163 if (map_info->type > LAST_KNOWN_MAP_TYPE) {
164 snprintf(unknown_map_type, sizeof(unknown_map_type),
165 "<%u>", map_info->type);
166 unknown_map_type[sizeof(unknown_map_type) - 1] = '\0';
167 map_type = unknown_map_type;
168 } else {
169 map_type = map_type_strings[map_info->type];
170 }
171
172 printf("%8u %-15s 0x%-8x %8u %8u %8u %-15s\n",
173 map_info->id, map_type, map_info->map_flags, map_info->key_size,
174 map_info->value_size, map_info->max_entries,
175 map_info->name);
176 }
177
print_one_prog(uint32_t prog_id)178 static int print_one_prog(uint32_t prog_id)
179 {
180 const uint32_t usual_nr_map_ids = 64;
181 uint32_t nr_map_ids = usual_nr_map_ids;
182 struct bpf_prog_info prog_info;
183 uint32_t *map_ids = NULL;
184 uint32_t info_len;
185 int ret = 0;
186 int prog_fd;
187 uint32_t i;
188
189 prog_fd = bpf_prog_get_fd_by_id(prog_id);
190 if (prog_fd == -1) {
191 if (errno == ENOENT) {
192 fprintf(stderr, "BID:%u not found\n", prog_id);
193 return EX_DATAERR;
194 } else {
195 return handle_get_next_errno(errno);
196 }
197 }
198
199 /* Retry at most one time for larger map_ids array */
200 for (i = 0; i < 2; i++) {
201 bzero(&prog_info, sizeof(prog_info));
202 prog_info.map_ids = ptr_to_u64(realloc(map_ids,
203 nr_map_ids * sizeof(*map_ids)));
204 if (!prog_info.map_ids) {
205 fprintf(stderr,
206 "Cannot allocate memory for %u map_ids for BID:%u\n",
207 nr_map_ids, prog_id);
208 close(prog_fd);
209 free(map_ids);
210 return 1;
211 }
212
213 map_ids = u64_to_ptr(prog_info.map_ids);
214 prog_info.nr_map_ids = nr_map_ids;
215 info_len = sizeof(prog_info);
216 ret = bpf_obj_get_info(prog_fd, &prog_info, &info_len);
217 if (ret) {
218 fprintf(stderr, "Cannot get info for BID:%u. %s(%d)\n",
219 prog_id, strerror(errno), errno);
220 close(prog_fd);
221 free(map_ids);
222 return ret;
223 }
224
225 if (prog_info.nr_map_ids <= nr_map_ids)
226 break;
227
228 nr_map_ids = prog_info.nr_map_ids;
229 }
230 close(prog_fd);
231
232 print_prog_hdr();
233 print_prog_info(&prog_info);
234 printf("\n");
235
236 /* Print all map_info used by the prog */
237 print_map_hdr();
238 nr_map_ids = min(prog_info.nr_map_ids, nr_map_ids);
239 for (i = 0; i < nr_map_ids; i++) {
240 struct bpf_map_info map_info = {};
241 info_len = sizeof(map_info);
242 int map_fd;
243
244 map_fd = bpf_map_get_fd_by_id(map_ids[i]);
245 if (map_fd == -1) {
246 if (errno == -ENOENT)
247 continue;
248
249 fprintf(stderr,
250 "Cannot get fd for map:%u. %s(%d)\n",
251 map_ids[i], strerror(errno), errno);
252 ret = map_fd;
253 break;
254 }
255
256 ret = bpf_obj_get_info(map_fd, &map_info, &info_len);
257 close(map_fd);
258 if (ret) {
259 fprintf(stderr, "Cannot get info for map:%u. %s(%d)\n",
260 map_ids[i], strerror(errno), errno);
261 break;
262 }
263
264 print_map_info(&map_info);
265 }
266
267 free(map_ids);
268 return ret;
269 }
270
print_all_progs(void)271 int print_all_progs(void)
272 {
273 uint32_t next_id = 0;
274
275 print_prog_hdr();
276
277 while (!bpf_prog_get_next_id(next_id, &next_id)) {
278 struct bpf_prog_info prog_info = {};
279 uint32_t prog_info_len = sizeof(prog_info);
280 int prog_fd;
281 int ret;
282
283 prog_fd = bpf_prog_get_fd_by_id(next_id);
284 if (prog_fd < 0) {
285 if (errno == ENOENT)
286 continue;
287 fprintf(stderr,
288 "Cannot get fd for BID:%u. %s(%d)\n",
289 next_id, strerror(errno), errno);
290 return 1;
291 }
292
293 ret = bpf_obj_get_info(prog_fd, &prog_info, &prog_info_len);
294 close(prog_fd);
295 if (ret) {
296 fprintf(stderr,
297 "Cannot get bpf_prog_info for BID:%u. %s(%d)\n",
298 next_id, strerror(errno), errno);
299 return ret;
300 }
301
302 print_prog_info(&prog_info);
303 }
304
305 return handle_get_next_errno(errno);
306 }
307
usage(void)308 void usage(void)
309 {
310 printf("BPF Program Snapshot (bps):\n"
311 "List of all BPF programs loaded into the system.\n\n");
312 printf("Usage: bps [bpf-prog-id]\n");
313 printf(" [bpf-prog-id] If specified, it shows the details info of the bpf-prog\n");
314 printf("\n");
315 }
316
main(int argc,char ** argv)317 int main(int argc, char **argv)
318 {
319 if (argc > 1) {
320 if (!isdigit(*argv[1])) {
321 usage();
322 return EX_USAGE;
323 }
324 return print_one_prog((uint32_t)atoi(argv[1]));
325 }
326
327 return print_all_progs();
328 }
329