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Commit | Line | Data |
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249b812d AS |
1 | #include <stdio.h> |
2 | #include <sys/types.h> | |
3 | #include <sys/stat.h> | |
4 | #include <fcntl.h> | |
5 | #include <libelf.h> | |
6 | #include <gelf.h> | |
7 | #include <errno.h> | |
8 | #include <unistd.h> | |
9 | #include <string.h> | |
10 | #include <stdbool.h> | |
b896c4f9 | 11 | #include <stdlib.h> |
249b812d AS |
12 | #include <linux/bpf.h> |
13 | #include <linux/filter.h> | |
b896c4f9 | 14 | #include <linux/perf_event.h> |
12d8bb64 MKL |
15 | #include <linux/netlink.h> |
16 | #include <linux/rtnetlink.h> | |
17 | #include <sys/types.h> | |
18 | #include <sys/socket.h> | |
b896c4f9 AS |
19 | #include <sys/syscall.h> |
20 | #include <sys/ioctl.h> | |
21 | #include <sys/mman.h> | |
22 | #include <poll.h> | |
5bacd780 | 23 | #include <ctype.h> |
249b812d | 24 | #include "libbpf.h" |
249b812d | 25 | #include "bpf_load.h" |
205c8ada | 26 | #include "perf-sys.h" |
249b812d | 27 | |
b896c4f9 AS |
28 | #define DEBUGFS "/sys/kernel/debug/tracing/" |
29 | ||
249b812d | 30 | static char license[128]; |
b896c4f9 | 31 | static int kern_version; |
249b812d | 32 | static bool processed_sec[128]; |
d40fc181 | 33 | char bpf_log_buf[BPF_LOG_BUF_SIZE]; |
249b812d AS |
34 | int map_fd[MAX_MAPS]; |
35 | int prog_fd[MAX_PROGS]; | |
b896c4f9 | 36 | int event_fd[MAX_PROGS]; |
249b812d | 37 | int prog_cnt; |
5bacd780 AS |
38 | int prog_array_fd = -1; |
39 | ||
d40fc181 JS |
40 | struct bpf_map_def { |
41 | unsigned int type; | |
42 | unsigned int key_size; | |
43 | unsigned int value_size; | |
44 | unsigned int max_entries; | |
45 | unsigned int map_flags; | |
46 | }; | |
47 | ||
5bacd780 AS |
48 | static int populate_prog_array(const char *event, int prog_fd) |
49 | { | |
50 | int ind = atoi(event), err; | |
51 | ||
d40fc181 | 52 | err = bpf_map_update_elem(prog_array_fd, &ind, &prog_fd, BPF_ANY); |
5bacd780 AS |
53 | if (err < 0) { |
54 | printf("failed to store prog_fd in prog_array\n"); | |
55 | return -1; | |
56 | } | |
57 | return 0; | |
58 | } | |
249b812d AS |
59 | |
60 | static int load_and_attach(const char *event, struct bpf_insn *prog, int size) | |
61 | { | |
249b812d | 62 | bool is_socket = strncmp(event, "socket", 6) == 0; |
b896c4f9 AS |
63 | bool is_kprobe = strncmp(event, "kprobe/", 7) == 0; |
64 | bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0; | |
c0766040 | 65 | bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0; |
86af8b41 | 66 | bool is_xdp = strncmp(event, "xdp", 3) == 0; |
1c47910e | 67 | bool is_perf_event = strncmp(event, "perf_event", 10) == 0; |
4f2e7ae5 DA |
68 | bool is_cgroup_skb = strncmp(event, "cgroup/skb", 10) == 0; |
69 | bool is_cgroup_sk = strncmp(event, "cgroup/sock", 11) == 0; | |
43371c83 | 70 | size_t insns_cnt = size / sizeof(struct bpf_insn); |
b896c4f9 AS |
71 | enum bpf_prog_type prog_type; |
72 | char buf[256]; | |
73 | int fd, efd, err, id; | |
74 | struct perf_event_attr attr = {}; | |
75 | ||
76 | attr.type = PERF_TYPE_TRACEPOINT; | |
77 | attr.sample_type = PERF_SAMPLE_RAW; | |
78 | attr.sample_period = 1; | |
79 | attr.wakeup_events = 1; | |
80 | ||
81 | if (is_socket) { | |
82 | prog_type = BPF_PROG_TYPE_SOCKET_FILTER; | |
83 | } else if (is_kprobe || is_kretprobe) { | |
84 | prog_type = BPF_PROG_TYPE_KPROBE; | |
c0766040 AS |
85 | } else if (is_tracepoint) { |
86 | prog_type = BPF_PROG_TYPE_TRACEPOINT; | |
86af8b41 BB |
87 | } else if (is_xdp) { |
88 | prog_type = BPF_PROG_TYPE_XDP; | |
1c47910e AS |
89 | } else if (is_perf_event) { |
90 | prog_type = BPF_PROG_TYPE_PERF_EVENT; | |
4f2e7ae5 DA |
91 | } else if (is_cgroup_skb) { |
92 | prog_type = BPF_PROG_TYPE_CGROUP_SKB; | |
93 | } else if (is_cgroup_sk) { | |
94 | prog_type = BPF_PROG_TYPE_CGROUP_SOCK; | |
b896c4f9 AS |
95 | } else { |
96 | printf("Unknown event '%s'\n", event); | |
249b812d | 97 | return -1; |
b896c4f9 AS |
98 | } |
99 | ||
43371c83 | 100 | fd = bpf_load_program(prog_type, prog, insns_cnt, license, kern_version, |
d40fc181 | 101 | bpf_log_buf, BPF_LOG_BUF_SIZE); |
5bacd780 | 102 | if (fd < 0) { |
d40fc181 | 103 | printf("bpf_load_program() err=%d\n%s", errno, bpf_log_buf); |
5bacd780 AS |
104 | return -1; |
105 | } | |
106 | ||
107 | prog_fd[prog_cnt++] = fd; | |
108 | ||
4f2e7ae5 | 109 | if (is_xdp || is_perf_event || is_cgroup_skb || is_cgroup_sk) |
86af8b41 BB |
110 | return 0; |
111 | ||
5bacd780 AS |
112 | if (is_socket) { |
113 | event += 6; | |
114 | if (*event != '/') | |
115 | return 0; | |
116 | event++; | |
117 | if (!isdigit(*event)) { | |
118 | printf("invalid prog number\n"); | |
119 | return -1; | |
120 | } | |
121 | return populate_prog_array(event, fd); | |
122 | } | |
123 | ||
b896c4f9 AS |
124 | if (is_kprobe || is_kretprobe) { |
125 | if (is_kprobe) | |
126 | event += 7; | |
127 | else | |
128 | event += 10; | |
129 | ||
5bacd780 AS |
130 | if (*event == 0) { |
131 | printf("event name cannot be empty\n"); | |
132 | return -1; | |
133 | } | |
134 | ||
135 | if (isdigit(*event)) | |
136 | return populate_prog_array(event, fd); | |
137 | ||
b896c4f9 AS |
138 | snprintf(buf, sizeof(buf), |
139 | "echo '%c:%s %s' >> /sys/kernel/debug/tracing/kprobe_events", | |
140 | is_kprobe ? 'p' : 'r', event, event); | |
141 | err = system(buf); | |
142 | if (err < 0) { | |
143 | printf("failed to create kprobe '%s' error '%s'\n", | |
144 | event, strerror(errno)); | |
145 | return -1; | |
146 | } | |
249b812d | 147 | |
c0766040 AS |
148 | strcpy(buf, DEBUGFS); |
149 | strcat(buf, "events/kprobes/"); | |
150 | strcat(buf, event); | |
151 | strcat(buf, "/id"); | |
152 | } else if (is_tracepoint) { | |
153 | event += 11; | |
154 | ||
155 | if (*event == 0) { | |
156 | printf("event name cannot be empty\n"); | |
157 | return -1; | |
158 | } | |
159 | strcpy(buf, DEBUGFS); | |
160 | strcat(buf, "events/"); | |
161 | strcat(buf, event); | |
162 | strcat(buf, "/id"); | |
163 | } | |
b896c4f9 AS |
164 | |
165 | efd = open(buf, O_RDONLY, 0); | |
166 | if (efd < 0) { | |
167 | printf("failed to open event %s\n", event); | |
168 | return -1; | |
169 | } | |
170 | ||
171 | err = read(efd, buf, sizeof(buf)); | |
172 | if (err < 0 || err >= sizeof(buf)) { | |
173 | printf("read from '%s' failed '%s'\n", event, strerror(errno)); | |
174 | return -1; | |
175 | } | |
176 | ||
177 | close(efd); | |
178 | ||
179 | buf[err] = 0; | |
180 | id = atoi(buf); | |
181 | attr.config = id; | |
182 | ||
205c8ada | 183 | efd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0); |
b896c4f9 AS |
184 | if (efd < 0) { |
185 | printf("event %d fd %d err %s\n", id, efd, strerror(errno)); | |
186 | return -1; | |
187 | } | |
188 | event_fd[prog_cnt - 1] = efd; | |
189 | ioctl(efd, PERF_EVENT_IOC_ENABLE, 0); | |
190 | ioctl(efd, PERF_EVENT_IOC_SET_BPF, fd); | |
191 | ||
249b812d AS |
192 | return 0; |
193 | } | |
194 | ||
195 | static int load_maps(struct bpf_map_def *maps, int len) | |
196 | { | |
197 | int i; | |
198 | ||
199 | for (i = 0; i < len / sizeof(struct bpf_map_def); i++) { | |
200 | ||
201 | map_fd[i] = bpf_create_map(maps[i].type, | |
202 | maps[i].key_size, | |
203 | maps[i].value_size, | |
89b97607 AS |
204 | maps[i].max_entries, |
205 | maps[i].map_flags); | |
618ec9a7 AS |
206 | if (map_fd[i] < 0) { |
207 | printf("failed to create a map: %d %s\n", | |
208 | errno, strerror(errno)); | |
249b812d | 209 | return 1; |
618ec9a7 | 210 | } |
5bacd780 AS |
211 | |
212 | if (maps[i].type == BPF_MAP_TYPE_PROG_ARRAY) | |
213 | prog_array_fd = map_fd[i]; | |
249b812d AS |
214 | } |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int get_sec(Elf *elf, int i, GElf_Ehdr *ehdr, char **shname, | |
219 | GElf_Shdr *shdr, Elf_Data **data) | |
220 | { | |
221 | Elf_Scn *scn; | |
222 | ||
223 | scn = elf_getscn(elf, i); | |
224 | if (!scn) | |
225 | return 1; | |
226 | ||
227 | if (gelf_getshdr(scn, shdr) != shdr) | |
228 | return 2; | |
229 | ||
230 | *shname = elf_strptr(elf, ehdr->e_shstrndx, shdr->sh_name); | |
231 | if (!*shname || !shdr->sh_size) | |
232 | return 3; | |
233 | ||
234 | *data = elf_getdata(scn, 0); | |
235 | if (!*data || elf_getdata(scn, *data) != NULL) | |
236 | return 4; | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int parse_relo_and_apply(Elf_Data *data, Elf_Data *symbols, | |
242 | GElf_Shdr *shdr, struct bpf_insn *insn) | |
243 | { | |
244 | int i, nrels; | |
245 | ||
246 | nrels = shdr->sh_size / shdr->sh_entsize; | |
247 | ||
248 | for (i = 0; i < nrels; i++) { | |
249 | GElf_Sym sym; | |
250 | GElf_Rel rel; | |
251 | unsigned int insn_idx; | |
252 | ||
253 | gelf_getrel(data, i, &rel); | |
254 | ||
255 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); | |
256 | ||
257 | gelf_getsym(symbols, GELF_R_SYM(rel.r_info), &sym); | |
258 | ||
259 | if (insn[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { | |
260 | printf("invalid relo for insn[%d].code 0x%x\n", | |
261 | insn_idx, insn[insn_idx].code); | |
262 | return 1; | |
263 | } | |
264 | insn[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; | |
265 | insn[insn_idx].imm = map_fd[sym.st_value / sizeof(struct bpf_map_def)]; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | int load_bpf_file(char *path) | |
272 | { | |
273 | int fd, i; | |
274 | Elf *elf; | |
275 | GElf_Ehdr ehdr; | |
276 | GElf_Shdr shdr, shdr_prog; | |
277 | Elf_Data *data, *data_prog, *symbols = NULL; | |
278 | char *shname, *shname_prog; | |
279 | ||
280 | if (elf_version(EV_CURRENT) == EV_NONE) | |
281 | return 1; | |
282 | ||
283 | fd = open(path, O_RDONLY, 0); | |
284 | if (fd < 0) | |
285 | return 1; | |
286 | ||
287 | elf = elf_begin(fd, ELF_C_READ, NULL); | |
288 | ||
289 | if (!elf) | |
290 | return 1; | |
291 | ||
292 | if (gelf_getehdr(elf, &ehdr) != &ehdr) | |
293 | return 1; | |
294 | ||
b896c4f9 AS |
295 | /* clear all kprobes */ |
296 | i = system("echo \"\" > /sys/kernel/debug/tracing/kprobe_events"); | |
297 | ||
249b812d AS |
298 | /* scan over all elf sections to get license and map info */ |
299 | for (i = 1; i < ehdr.e_shnum; i++) { | |
300 | ||
301 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
302 | continue; | |
303 | ||
304 | if (0) /* helpful for llvm debugging */ | |
305 | printf("section %d:%s data %p size %zd link %d flags %d\n", | |
306 | i, shname, data->d_buf, data->d_size, | |
307 | shdr.sh_link, (int) shdr.sh_flags); | |
308 | ||
309 | if (strcmp(shname, "license") == 0) { | |
310 | processed_sec[i] = true; | |
311 | memcpy(license, data->d_buf, data->d_size); | |
b896c4f9 AS |
312 | } else if (strcmp(shname, "version") == 0) { |
313 | processed_sec[i] = true; | |
314 | if (data->d_size != sizeof(int)) { | |
315 | printf("invalid size of version section %zd\n", | |
316 | data->d_size); | |
317 | return 1; | |
318 | } | |
319 | memcpy(&kern_version, data->d_buf, sizeof(int)); | |
249b812d AS |
320 | } else if (strcmp(shname, "maps") == 0) { |
321 | processed_sec[i] = true; | |
322 | if (load_maps(data->d_buf, data->d_size)) | |
323 | return 1; | |
324 | } else if (shdr.sh_type == SHT_SYMTAB) { | |
325 | symbols = data; | |
326 | } | |
327 | } | |
328 | ||
329 | /* load programs that need map fixup (relocations) */ | |
330 | for (i = 1; i < ehdr.e_shnum; i++) { | |
331 | ||
332 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
333 | continue; | |
334 | if (shdr.sh_type == SHT_REL) { | |
335 | struct bpf_insn *insns; | |
336 | ||
337 | if (get_sec(elf, shdr.sh_info, &ehdr, &shname_prog, | |
338 | &shdr_prog, &data_prog)) | |
339 | continue; | |
340 | ||
db6a71dd AS |
341 | if (shdr_prog.sh_type != SHT_PROGBITS || |
342 | !(shdr_prog.sh_flags & SHF_EXECINSTR)) | |
343 | continue; | |
344 | ||
249b812d AS |
345 | insns = (struct bpf_insn *) data_prog->d_buf; |
346 | ||
347 | processed_sec[shdr.sh_info] = true; | |
348 | processed_sec[i] = true; | |
349 | ||
350 | if (parse_relo_and_apply(data, symbols, &shdr, insns)) | |
351 | continue; | |
352 | ||
b896c4f9 AS |
353 | if (memcmp(shname_prog, "kprobe/", 7) == 0 || |
354 | memcmp(shname_prog, "kretprobe/", 10) == 0 || | |
c0766040 | 355 | memcmp(shname_prog, "tracepoint/", 11) == 0 || |
86af8b41 | 356 | memcmp(shname_prog, "xdp", 3) == 0 || |
1c47910e | 357 | memcmp(shname_prog, "perf_event", 10) == 0 || |
4f2e7ae5 DA |
358 | memcmp(shname_prog, "socket", 6) == 0 || |
359 | memcmp(shname_prog, "cgroup/", 7) == 0) | |
249b812d AS |
360 | load_and_attach(shname_prog, insns, data_prog->d_size); |
361 | } | |
362 | } | |
363 | ||
364 | /* load programs that don't use maps */ | |
365 | for (i = 1; i < ehdr.e_shnum; i++) { | |
366 | ||
367 | if (processed_sec[i]) | |
368 | continue; | |
369 | ||
370 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
371 | continue; | |
372 | ||
b896c4f9 AS |
373 | if (memcmp(shname, "kprobe/", 7) == 0 || |
374 | memcmp(shname, "kretprobe/", 10) == 0 || | |
c0766040 | 375 | memcmp(shname, "tracepoint/", 11) == 0 || |
86af8b41 | 376 | memcmp(shname, "xdp", 3) == 0 || |
1c47910e | 377 | memcmp(shname, "perf_event", 10) == 0 || |
4f2e7ae5 DA |
378 | memcmp(shname, "socket", 6) == 0 || |
379 | memcmp(shname, "cgroup/", 7) == 0) | |
249b812d AS |
380 | load_and_attach(shname, data->d_buf, data->d_size); |
381 | } | |
382 | ||
383 | close(fd); | |
384 | return 0; | |
385 | } | |
b896c4f9 AS |
386 | |
387 | void read_trace_pipe(void) | |
388 | { | |
389 | int trace_fd; | |
390 | ||
391 | trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0); | |
392 | if (trace_fd < 0) | |
393 | return; | |
394 | ||
395 | while (1) { | |
396 | static char buf[4096]; | |
397 | ssize_t sz; | |
398 | ||
399 | sz = read(trace_fd, buf, sizeof(buf)); | |
400 | if (sz > 0) { | |
401 | buf[sz] = 0; | |
402 | puts(buf); | |
403 | } | |
404 | } | |
405 | } | |
3622e7e4 AS |
406 | |
407 | #define MAX_SYMS 300000 | |
408 | static struct ksym syms[MAX_SYMS]; | |
409 | static int sym_cnt; | |
410 | ||
411 | static int ksym_cmp(const void *p1, const void *p2) | |
412 | { | |
413 | return ((struct ksym *)p1)->addr - ((struct ksym *)p2)->addr; | |
414 | } | |
415 | ||
416 | int load_kallsyms(void) | |
417 | { | |
418 | FILE *f = fopen("/proc/kallsyms", "r"); | |
419 | char func[256], buf[256]; | |
420 | char symbol; | |
421 | void *addr; | |
422 | int i = 0; | |
423 | ||
424 | if (!f) | |
425 | return -ENOENT; | |
426 | ||
427 | while (!feof(f)) { | |
428 | if (!fgets(buf, sizeof(buf), f)) | |
429 | break; | |
430 | if (sscanf(buf, "%p %c %s", &addr, &symbol, func) != 3) | |
431 | break; | |
432 | if (!addr) | |
433 | continue; | |
434 | syms[i].addr = (long) addr; | |
435 | syms[i].name = strdup(func); | |
436 | i++; | |
437 | } | |
438 | sym_cnt = i; | |
439 | qsort(syms, sym_cnt, sizeof(struct ksym), ksym_cmp); | |
440 | return 0; | |
441 | } | |
442 | ||
443 | struct ksym *ksym_search(long key) | |
444 | { | |
445 | int start = 0, end = sym_cnt; | |
446 | int result; | |
447 | ||
448 | while (start < end) { | |
449 | size_t mid = start + (end - start) / 2; | |
450 | ||
451 | result = key - syms[mid].addr; | |
452 | if (result < 0) | |
453 | end = mid; | |
454 | else if (result > 0) | |
455 | start = mid + 1; | |
456 | else | |
457 | return &syms[mid]; | |
458 | } | |
459 | ||
460 | if (start >= 1 && syms[start - 1].addr < key && | |
461 | key < syms[start].addr) | |
462 | /* valid ksym */ | |
463 | return &syms[start - 1]; | |
464 | ||
465 | /* out of range. return _stext */ | |
466 | return &syms[0]; | |
467 | } | |
12d8bb64 MKL |
468 | |
469 | int set_link_xdp_fd(int ifindex, int fd) | |
470 | { | |
471 | struct sockaddr_nl sa; | |
472 | int sock, seq = 0, len, ret = -1; | |
473 | char buf[4096]; | |
474 | struct nlattr *nla, *nla_xdp; | |
475 | struct { | |
476 | struct nlmsghdr nh; | |
477 | struct ifinfomsg ifinfo; | |
478 | char attrbuf[64]; | |
479 | } req; | |
480 | struct nlmsghdr *nh; | |
481 | struct nlmsgerr *err; | |
482 | ||
483 | memset(&sa, 0, sizeof(sa)); | |
484 | sa.nl_family = AF_NETLINK; | |
485 | ||
486 | sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
487 | if (sock < 0) { | |
488 | printf("open netlink socket: %s\n", strerror(errno)); | |
489 | return -1; | |
490 | } | |
491 | ||
492 | if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) { | |
493 | printf("bind to netlink: %s\n", strerror(errno)); | |
494 | goto cleanup; | |
495 | } | |
496 | ||
497 | memset(&req, 0, sizeof(req)); | |
498 | req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)); | |
499 | req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
500 | req.nh.nlmsg_type = RTM_SETLINK; | |
501 | req.nh.nlmsg_pid = 0; | |
502 | req.nh.nlmsg_seq = ++seq; | |
503 | req.ifinfo.ifi_family = AF_UNSPEC; | |
504 | req.ifinfo.ifi_index = ifindex; | |
505 | nla = (struct nlattr *)(((char *)&req) | |
506 | + NLMSG_ALIGN(req.nh.nlmsg_len)); | |
507 | nla->nla_type = NLA_F_NESTED | 43/*IFLA_XDP*/; | |
508 | ||
509 | nla_xdp = (struct nlattr *)((char *)nla + NLA_HDRLEN); | |
510 | nla_xdp->nla_type = 1/*IFLA_XDP_FD*/; | |
511 | nla_xdp->nla_len = NLA_HDRLEN + sizeof(int); | |
512 | memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd)); | |
513 | nla->nla_len = NLA_HDRLEN + nla_xdp->nla_len; | |
514 | ||
515 | req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len); | |
516 | ||
517 | if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) { | |
518 | printf("send to netlink: %s\n", strerror(errno)); | |
519 | goto cleanup; | |
520 | } | |
521 | ||
522 | len = recv(sock, buf, sizeof(buf), 0); | |
523 | if (len < 0) { | |
524 | printf("recv from netlink: %s\n", strerror(errno)); | |
525 | goto cleanup; | |
526 | } | |
527 | ||
528 | for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len); | |
529 | nh = NLMSG_NEXT(nh, len)) { | |
530 | if (nh->nlmsg_pid != getpid()) { | |
531 | printf("Wrong pid %d, expected %d\n", | |
532 | nh->nlmsg_pid, getpid()); | |
533 | goto cleanup; | |
534 | } | |
535 | if (nh->nlmsg_seq != seq) { | |
536 | printf("Wrong seq %d, expected %d\n", | |
537 | nh->nlmsg_seq, seq); | |
538 | goto cleanup; | |
539 | } | |
540 | switch (nh->nlmsg_type) { | |
541 | case NLMSG_ERROR: | |
542 | err = (struct nlmsgerr *)NLMSG_DATA(nh); | |
543 | if (!err->error) | |
544 | continue; | |
545 | printf("nlmsg error %s\n", strerror(-err->error)); | |
546 | goto cleanup; | |
547 | case NLMSG_DONE: | |
548 | break; | |
549 | } | |
550 | } | |
551 | ||
552 | ret = 0; | |
553 | ||
554 | cleanup: | |
555 | close(sock); | |
556 | return ret; | |
557 | } |