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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> | |
6387d011 | 17 | #include <linux/types.h> |
12d8bb64 MKL |
18 | #include <sys/types.h> |
19 | #include <sys/socket.h> | |
b896c4f9 AS |
20 | #include <sys/syscall.h> |
21 | #include <sys/ioctl.h> | |
22 | #include <sys/mman.h> | |
23 | #include <poll.h> | |
5bacd780 | 24 | #include <ctype.h> |
9fd63d05 | 25 | #include <assert.h> |
249b812d | 26 | #include "libbpf.h" |
249b812d | 27 | #include "bpf_load.h" |
205c8ada | 28 | #include "perf-sys.h" |
249b812d | 29 | |
b896c4f9 AS |
30 | #define DEBUGFS "/sys/kernel/debug/tracing/" |
31 | ||
249b812d | 32 | static char license[128]; |
b896c4f9 | 33 | static int kern_version; |
249b812d | 34 | static bool processed_sec[128]; |
d40fc181 | 35 | char bpf_log_buf[BPF_LOG_BUF_SIZE]; |
249b812d AS |
36 | int map_fd[MAX_MAPS]; |
37 | int prog_fd[MAX_PROGS]; | |
b896c4f9 | 38 | int event_fd[MAX_PROGS]; |
249b812d | 39 | int prog_cnt; |
5bacd780 AS |
40 | int prog_array_fd = -1; |
41 | ||
156450d9 JDB |
42 | struct bpf_map_data map_data[MAX_MAPS]; |
43 | int map_data_count = 0; | |
44 | ||
5bacd780 AS |
45 | static int populate_prog_array(const char *event, int prog_fd) |
46 | { | |
47 | int ind = atoi(event), err; | |
48 | ||
d40fc181 | 49 | err = bpf_map_update_elem(prog_array_fd, &ind, &prog_fd, BPF_ANY); |
5bacd780 AS |
50 | if (err < 0) { |
51 | printf("failed to store prog_fd in prog_array\n"); | |
52 | return -1; | |
53 | } | |
54 | return 0; | |
55 | } | |
249b812d AS |
56 | |
57 | static int load_and_attach(const char *event, struct bpf_insn *prog, int size) | |
58 | { | |
249b812d | 59 | bool is_socket = strncmp(event, "socket", 6) == 0; |
b896c4f9 AS |
60 | bool is_kprobe = strncmp(event, "kprobe/", 7) == 0; |
61 | bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0; | |
c0766040 | 62 | bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0; |
86af8b41 | 63 | bool is_xdp = strncmp(event, "xdp", 3) == 0; |
1c47910e | 64 | bool is_perf_event = strncmp(event, "perf_event", 10) == 0; |
4f2e7ae5 DA |
65 | bool is_cgroup_skb = strncmp(event, "cgroup/skb", 10) == 0; |
66 | bool is_cgroup_sk = strncmp(event, "cgroup/sock", 11) == 0; | |
40304b2a | 67 | bool is_sockops = strncmp(event, "sockops", 7) == 0; |
43371c83 | 68 | size_t insns_cnt = size / sizeof(struct bpf_insn); |
b896c4f9 AS |
69 | enum bpf_prog_type prog_type; |
70 | char buf[256]; | |
71 | int fd, efd, err, id; | |
72 | struct perf_event_attr attr = {}; | |
73 | ||
74 | attr.type = PERF_TYPE_TRACEPOINT; | |
75 | attr.sample_type = PERF_SAMPLE_RAW; | |
76 | attr.sample_period = 1; | |
77 | attr.wakeup_events = 1; | |
78 | ||
79 | if (is_socket) { | |
80 | prog_type = BPF_PROG_TYPE_SOCKET_FILTER; | |
81 | } else if (is_kprobe || is_kretprobe) { | |
82 | prog_type = BPF_PROG_TYPE_KPROBE; | |
c0766040 AS |
83 | } else if (is_tracepoint) { |
84 | prog_type = BPF_PROG_TYPE_TRACEPOINT; | |
86af8b41 BB |
85 | } else if (is_xdp) { |
86 | prog_type = BPF_PROG_TYPE_XDP; | |
1c47910e AS |
87 | } else if (is_perf_event) { |
88 | prog_type = BPF_PROG_TYPE_PERF_EVENT; | |
4f2e7ae5 DA |
89 | } else if (is_cgroup_skb) { |
90 | prog_type = BPF_PROG_TYPE_CGROUP_SKB; | |
91 | } else if (is_cgroup_sk) { | |
92 | prog_type = BPF_PROG_TYPE_CGROUP_SOCK; | |
40304b2a LB |
93 | } else if (is_sockops) { |
94 | prog_type = BPF_PROG_TYPE_SOCK_OPS; | |
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 | ||
40304b2a LB |
112 | if (is_socket || is_sockops) { |
113 | if (is_socket) | |
114 | event += 6; | |
115 | else | |
116 | event += 7; | |
5bacd780 AS |
117 | if (*event != '/') |
118 | return 0; | |
119 | event++; | |
120 | if (!isdigit(*event)) { | |
121 | printf("invalid prog number\n"); | |
122 | return -1; | |
123 | } | |
124 | return populate_prog_array(event, fd); | |
125 | } | |
126 | ||
b896c4f9 AS |
127 | if (is_kprobe || is_kretprobe) { |
128 | if (is_kprobe) | |
129 | event += 7; | |
130 | else | |
131 | event += 10; | |
132 | ||
5bacd780 AS |
133 | if (*event == 0) { |
134 | printf("event name cannot be empty\n"); | |
135 | return -1; | |
136 | } | |
137 | ||
138 | if (isdigit(*event)) | |
139 | return populate_prog_array(event, fd); | |
140 | ||
b896c4f9 AS |
141 | snprintf(buf, sizeof(buf), |
142 | "echo '%c:%s %s' >> /sys/kernel/debug/tracing/kprobe_events", | |
143 | is_kprobe ? 'p' : 'r', event, event); | |
144 | err = system(buf); | |
145 | if (err < 0) { | |
146 | printf("failed to create kprobe '%s' error '%s'\n", | |
147 | event, strerror(errno)); | |
148 | return -1; | |
149 | } | |
249b812d | 150 | |
c0766040 AS |
151 | strcpy(buf, DEBUGFS); |
152 | strcat(buf, "events/kprobes/"); | |
153 | strcat(buf, event); | |
154 | strcat(buf, "/id"); | |
155 | } else if (is_tracepoint) { | |
156 | event += 11; | |
157 | ||
158 | if (*event == 0) { | |
159 | printf("event name cannot be empty\n"); | |
160 | return -1; | |
161 | } | |
162 | strcpy(buf, DEBUGFS); | |
163 | strcat(buf, "events/"); | |
164 | strcat(buf, event); | |
165 | strcat(buf, "/id"); | |
166 | } | |
b896c4f9 AS |
167 | |
168 | efd = open(buf, O_RDONLY, 0); | |
169 | if (efd < 0) { | |
170 | printf("failed to open event %s\n", event); | |
171 | return -1; | |
172 | } | |
173 | ||
174 | err = read(efd, buf, sizeof(buf)); | |
175 | if (err < 0 || err >= sizeof(buf)) { | |
176 | printf("read from '%s' failed '%s'\n", event, strerror(errno)); | |
177 | return -1; | |
178 | } | |
179 | ||
180 | close(efd); | |
181 | ||
182 | buf[err] = 0; | |
183 | id = atoi(buf); | |
184 | attr.config = id; | |
185 | ||
205c8ada | 186 | efd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0); |
b896c4f9 AS |
187 | if (efd < 0) { |
188 | printf("event %d fd %d err %s\n", id, efd, strerror(errno)); | |
189 | return -1; | |
190 | } | |
191 | event_fd[prog_cnt - 1] = efd; | |
192 | ioctl(efd, PERF_EVENT_IOC_ENABLE, 0); | |
193 | ioctl(efd, PERF_EVENT_IOC_SET_BPF, fd); | |
194 | ||
249b812d AS |
195 | return 0; |
196 | } | |
197 | ||
156450d9 JDB |
198 | static int load_maps(struct bpf_map_data *maps, int nr_maps, |
199 | fixup_map_cb fixup_map) | |
249b812d AS |
200 | { |
201 | int i; | |
156450d9 | 202 | |
5010e948 | 203 | for (i = 0; i < nr_maps; i++) { |
6979bcc7 JDB |
204 | if (fixup_map) { |
205 | fixup_map(&maps[i], i); | |
206 | /* Allow userspace to assign map FD prior to creation */ | |
207 | if (maps[i].fd != -1) { | |
208 | map_fd[i] = maps[i].fd; | |
209 | continue; | |
210 | } | |
211 | } | |
249b812d | 212 | |
156450d9 JDB |
213 | if (maps[i].def.type == BPF_MAP_TYPE_ARRAY_OF_MAPS || |
214 | maps[i].def.type == BPF_MAP_TYPE_HASH_OF_MAPS) { | |
215 | int inner_map_fd = map_fd[maps[i].def.inner_map_idx]; | |
fb30d4b7 | 216 | |
156450d9 JDB |
217 | map_fd[i] = bpf_create_map_in_map(maps[i].def.type, |
218 | maps[i].def.key_size, | |
219 | inner_map_fd, | |
220 | maps[i].def.max_entries, | |
221 | maps[i].def.map_flags); | |
fb30d4b7 | 222 | } else { |
156450d9 JDB |
223 | map_fd[i] = bpf_create_map(maps[i].def.type, |
224 | maps[i].def.key_size, | |
225 | maps[i].def.value_size, | |
226 | maps[i].def.max_entries, | |
227 | maps[i].def.map_flags); | |
fb30d4b7 | 228 | } |
618ec9a7 AS |
229 | if (map_fd[i] < 0) { |
230 | printf("failed to create a map: %d %s\n", | |
231 | errno, strerror(errno)); | |
249b812d | 232 | return 1; |
618ec9a7 | 233 | } |
156450d9 | 234 | maps[i].fd = map_fd[i]; |
5bacd780 | 235 | |
156450d9 | 236 | if (maps[i].def.type == BPF_MAP_TYPE_PROG_ARRAY) |
5bacd780 | 237 | prog_array_fd = map_fd[i]; |
249b812d AS |
238 | } |
239 | return 0; | |
240 | } | |
241 | ||
242 | static int get_sec(Elf *elf, int i, GElf_Ehdr *ehdr, char **shname, | |
243 | GElf_Shdr *shdr, Elf_Data **data) | |
244 | { | |
245 | Elf_Scn *scn; | |
246 | ||
247 | scn = elf_getscn(elf, i); | |
248 | if (!scn) | |
249 | return 1; | |
250 | ||
251 | if (gelf_getshdr(scn, shdr) != shdr) | |
252 | return 2; | |
253 | ||
254 | *shname = elf_strptr(elf, ehdr->e_shstrndx, shdr->sh_name); | |
255 | if (!*shname || !shdr->sh_size) | |
256 | return 3; | |
257 | ||
258 | *data = elf_getdata(scn, 0); | |
259 | if (!*data || elf_getdata(scn, *data) != NULL) | |
260 | return 4; | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static int parse_relo_and_apply(Elf_Data *data, Elf_Data *symbols, | |
156450d9 JDB |
266 | GElf_Shdr *shdr, struct bpf_insn *insn, |
267 | struct bpf_map_data *maps, int nr_maps) | |
249b812d AS |
268 | { |
269 | int i, nrels; | |
270 | ||
271 | nrels = shdr->sh_size / shdr->sh_entsize; | |
272 | ||
273 | for (i = 0; i < nrels; i++) { | |
274 | GElf_Sym sym; | |
275 | GElf_Rel rel; | |
276 | unsigned int insn_idx; | |
156450d9 JDB |
277 | bool match = false; |
278 | int j, map_idx; | |
249b812d AS |
279 | |
280 | gelf_getrel(data, i, &rel); | |
281 | ||
282 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); | |
283 | ||
284 | gelf_getsym(symbols, GELF_R_SYM(rel.r_info), &sym); | |
285 | ||
286 | if (insn[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { | |
287 | printf("invalid relo for insn[%d].code 0x%x\n", | |
288 | insn_idx, insn[insn_idx].code); | |
289 | return 1; | |
290 | } | |
291 | insn[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; | |
156450d9 JDB |
292 | |
293 | /* Match FD relocation against recorded map_data[] offset */ | |
294 | for (map_idx = 0; map_idx < nr_maps; map_idx++) { | |
295 | if (maps[map_idx].elf_offset == sym.st_value) { | |
296 | match = true; | |
297 | break; | |
298 | } | |
299 | } | |
300 | if (match) { | |
301 | insn[insn_idx].imm = maps[map_idx].fd; | |
302 | } else { | |
303 | printf("invalid relo for insn[%d] no map_data match\n", | |
304 | insn_idx); | |
305 | return 1; | |
306 | } | |
249b812d AS |
307 | } |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
9fd63d05 MKL |
312 | static int cmp_symbols(const void *l, const void *r) |
313 | { | |
314 | const GElf_Sym *lsym = (const GElf_Sym *)l; | |
315 | const GElf_Sym *rsym = (const GElf_Sym *)r; | |
316 | ||
317 | if (lsym->st_value < rsym->st_value) | |
318 | return -1; | |
319 | else if (lsym->st_value > rsym->st_value) | |
320 | return 1; | |
321 | else | |
322 | return 0; | |
323 | } | |
324 | ||
156450d9 JDB |
325 | static int load_elf_maps_section(struct bpf_map_data *maps, int maps_shndx, |
326 | Elf *elf, Elf_Data *symbols, int strtabidx) | |
9fd63d05 | 327 | { |
156450d9 JDB |
328 | int map_sz_elf, map_sz_copy; |
329 | bool validate_zero = false; | |
330 | Elf_Data *data_maps; | |
331 | int i, nr_maps; | |
332 | GElf_Sym *sym; | |
333 | Elf_Scn *scn; | |
334 | int copy_sz; | |
335 | ||
336 | if (maps_shndx < 0) | |
337 | return -EINVAL; | |
338 | if (!symbols) | |
339 | return -EINVAL; | |
340 | ||
341 | /* Get data for maps section via elf index */ | |
342 | scn = elf_getscn(elf, maps_shndx); | |
343 | if (scn) | |
344 | data_maps = elf_getdata(scn, NULL); | |
345 | if (!scn || !data_maps) { | |
346 | printf("Failed to get Elf_Data from maps section %d\n", | |
347 | maps_shndx); | |
348 | return -EINVAL; | |
349 | } | |
9fd63d05 | 350 | |
156450d9 JDB |
351 | /* For each map get corrosponding symbol table entry */ |
352 | sym = calloc(MAX_MAPS+1, sizeof(GElf_Sym)); | |
353 | for (i = 0, nr_maps = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { | |
354 | assert(nr_maps < MAX_MAPS+1); | |
355 | if (!gelf_getsym(symbols, i, &sym[nr_maps])) | |
9fd63d05 | 356 | continue; |
156450d9 | 357 | if (sym[nr_maps].st_shndx != maps_shndx) |
9fd63d05 | 358 | continue; |
156450d9 | 359 | /* Only increment iif maps section */ |
9fd63d05 MKL |
360 | nr_maps++; |
361 | } | |
362 | ||
156450d9 JDB |
363 | /* Align to map_fd[] order, via sort on offset in sym.st_value */ |
364 | qsort(sym, nr_maps, sizeof(GElf_Sym), cmp_symbols); | |
365 | ||
366 | /* Keeping compatible with ELF maps section changes | |
367 | * ------------------------------------------------ | |
368 | * The program size of struct bpf_map_def is known by loader | |
369 | * code, but struct stored in ELF file can be different. | |
370 | * | |
371 | * Unfortunately sym[i].st_size is zero. To calculate the | |
372 | * struct size stored in the ELF file, assume all struct have | |
373 | * the same size, and simply divide with number of map | |
374 | * symbols. | |
375 | */ | |
376 | map_sz_elf = data_maps->d_size / nr_maps; | |
377 | map_sz_copy = sizeof(struct bpf_map_def); | |
378 | if (map_sz_elf < map_sz_copy) { | |
379 | /* | |
380 | * Backward compat, loading older ELF file with | |
381 | * smaller struct, keeping remaining bytes zero. | |
382 | */ | |
383 | map_sz_copy = map_sz_elf; | |
384 | } else if (map_sz_elf > map_sz_copy) { | |
385 | /* | |
386 | * Forward compat, loading newer ELF file with larger | |
387 | * struct with unknown features. Assume zero means | |
388 | * feature not used. Thus, validate rest of struct | |
389 | * data is zero. | |
390 | */ | |
391 | validate_zero = true; | |
392 | } | |
9fd63d05 | 393 | |
156450d9 | 394 | /* Memcpy relevant part of ELF maps data to loader maps */ |
9fd63d05 | 395 | for (i = 0; i < nr_maps; i++) { |
156450d9 JDB |
396 | unsigned char *addr, *end; |
397 | struct bpf_map_def *def; | |
398 | const char *map_name; | |
399 | size_t offset; | |
400 | ||
401 | map_name = elf_strptr(elf, strtabidx, sym[i].st_name); | |
402 | maps[i].name = strdup(map_name); | |
403 | if (!maps[i].name) { | |
9fd63d05 MKL |
404 | printf("strdup(%s): %s(%d)\n", map_name, |
405 | strerror(errno), errno); | |
156450d9 JDB |
406 | free(sym); |
407 | return -errno; | |
408 | } | |
409 | ||
410 | /* Symbol value is offset into ELF maps section data area */ | |
411 | offset = sym[i].st_value; | |
412 | def = (struct bpf_map_def *)(data_maps->d_buf + offset); | |
413 | maps[i].elf_offset = offset; | |
414 | memset(&maps[i].def, 0, sizeof(struct bpf_map_def)); | |
415 | memcpy(&maps[i].def, def, map_sz_copy); | |
416 | ||
417 | /* Verify no newer features were requested */ | |
418 | if (validate_zero) { | |
419 | addr = (unsigned char*) def + map_sz_copy; | |
420 | end = (unsigned char*) def + map_sz_elf; | |
421 | for (; addr < end; addr++) { | |
422 | if (*addr != 0) { | |
423 | free(sym); | |
424 | return -EFBIG; | |
425 | } | |
426 | } | |
9fd63d05 MKL |
427 | } |
428 | } | |
429 | ||
156450d9 | 430 | free(sym); |
5010e948 | 431 | return nr_maps; |
9fd63d05 MKL |
432 | } |
433 | ||
434 | static int do_load_bpf_file(const char *path, fixup_map_cb fixup_map) | |
249b812d | 435 | { |
9fd63d05 | 436 | int fd, i, ret, maps_shndx = -1, strtabidx = -1; |
249b812d AS |
437 | Elf *elf; |
438 | GElf_Ehdr ehdr; | |
439 | GElf_Shdr shdr, shdr_prog; | |
9fd63d05 | 440 | Elf_Data *data, *data_prog, *data_maps = NULL, *symbols = NULL; |
156450d9 JDB |
441 | char *shname, *shname_prog; |
442 | int nr_maps = 0; | |
249b812d | 443 | |
a734fb5d MS |
444 | /* reset global variables */ |
445 | kern_version = 0; | |
446 | memset(license, 0, sizeof(license)); | |
447 | memset(processed_sec, 0, sizeof(processed_sec)); | |
448 | ||
249b812d AS |
449 | if (elf_version(EV_CURRENT) == EV_NONE) |
450 | return 1; | |
451 | ||
452 | fd = open(path, O_RDONLY, 0); | |
453 | if (fd < 0) | |
454 | return 1; | |
455 | ||
456 | elf = elf_begin(fd, ELF_C_READ, NULL); | |
457 | ||
458 | if (!elf) | |
459 | return 1; | |
460 | ||
461 | if (gelf_getehdr(elf, &ehdr) != &ehdr) | |
462 | return 1; | |
463 | ||
b896c4f9 AS |
464 | /* clear all kprobes */ |
465 | i = system("echo \"\" > /sys/kernel/debug/tracing/kprobe_events"); | |
466 | ||
249b812d AS |
467 | /* scan over all elf sections to get license and map info */ |
468 | for (i = 1; i < ehdr.e_shnum; i++) { | |
469 | ||
470 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
471 | continue; | |
472 | ||
473 | if (0) /* helpful for llvm debugging */ | |
474 | printf("section %d:%s data %p size %zd link %d flags %d\n", | |
475 | i, shname, data->d_buf, data->d_size, | |
476 | shdr.sh_link, (int) shdr.sh_flags); | |
477 | ||
478 | if (strcmp(shname, "license") == 0) { | |
479 | processed_sec[i] = true; | |
480 | memcpy(license, data->d_buf, data->d_size); | |
b896c4f9 AS |
481 | } else if (strcmp(shname, "version") == 0) { |
482 | processed_sec[i] = true; | |
483 | if (data->d_size != sizeof(int)) { | |
484 | printf("invalid size of version section %zd\n", | |
485 | data->d_size); | |
486 | return 1; | |
487 | } | |
488 | memcpy(&kern_version, data->d_buf, sizeof(int)); | |
249b812d | 489 | } else if (strcmp(shname, "maps") == 0) { |
156450d9 JDB |
490 | int j; |
491 | ||
9fd63d05 MKL |
492 | maps_shndx = i; |
493 | data_maps = data; | |
156450d9 JDB |
494 | for (j = 0; j < MAX_MAPS; j++) |
495 | map_data[j].fd = -1; | |
249b812d | 496 | } else if (shdr.sh_type == SHT_SYMTAB) { |
9fd63d05 | 497 | strtabidx = shdr.sh_link; |
249b812d AS |
498 | symbols = data; |
499 | } | |
500 | } | |
501 | ||
9fd63d05 MKL |
502 | ret = 1; |
503 | ||
504 | if (!symbols) { | |
505 | printf("missing SHT_SYMTAB section\n"); | |
506 | goto done; | |
507 | } | |
508 | ||
509 | if (data_maps) { | |
156450d9 JDB |
510 | nr_maps = load_elf_maps_section(map_data, maps_shndx, |
511 | elf, symbols, strtabidx); | |
512 | if (nr_maps < 0) { | |
513 | printf("Error: Failed loading ELF maps (errno:%d):%s\n", | |
514 | nr_maps, strerror(-nr_maps)); | |
5010e948 JDB |
515 | ret = 1; |
516 | goto done; | |
517 | } | |
156450d9 | 518 | if (load_maps(map_data, nr_maps, fixup_map)) |
9fd63d05 | 519 | goto done; |
156450d9 | 520 | map_data_count = nr_maps; |
9fd63d05 MKL |
521 | |
522 | processed_sec[maps_shndx] = true; | |
523 | } | |
524 | ||
7bc57950 | 525 | /* process all relo sections, and rewrite bpf insns for maps */ |
249b812d | 526 | for (i = 1; i < ehdr.e_shnum; i++) { |
16ad1329 MS |
527 | if (processed_sec[i]) |
528 | continue; | |
249b812d AS |
529 | |
530 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
531 | continue; | |
7bc57950 | 532 | |
249b812d AS |
533 | if (shdr.sh_type == SHT_REL) { |
534 | struct bpf_insn *insns; | |
535 | ||
7bc57950 | 536 | /* locate prog sec that need map fixup (relocations) */ |
249b812d AS |
537 | if (get_sec(elf, shdr.sh_info, &ehdr, &shname_prog, |
538 | &shdr_prog, &data_prog)) | |
539 | continue; | |
540 | ||
db6a71dd AS |
541 | if (shdr_prog.sh_type != SHT_PROGBITS || |
542 | !(shdr_prog.sh_flags & SHF_EXECINSTR)) | |
543 | continue; | |
544 | ||
249b812d | 545 | insns = (struct bpf_insn *) data_prog->d_buf; |
7bc57950 | 546 | processed_sec[i] = true; /* relo section */ |
249b812d | 547 | |
156450d9 JDB |
548 | if (parse_relo_and_apply(data, symbols, &shdr, insns, |
549 | map_data, nr_maps)) | |
249b812d | 550 | continue; |
249b812d AS |
551 | } |
552 | } | |
553 | ||
7bc57950 | 554 | /* load programs */ |
249b812d AS |
555 | for (i = 1; i < ehdr.e_shnum; i++) { |
556 | ||
557 | if (processed_sec[i]) | |
558 | continue; | |
559 | ||
560 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
561 | continue; | |
562 | ||
b896c4f9 AS |
563 | if (memcmp(shname, "kprobe/", 7) == 0 || |
564 | memcmp(shname, "kretprobe/", 10) == 0 || | |
c0766040 | 565 | memcmp(shname, "tracepoint/", 11) == 0 || |
86af8b41 | 566 | memcmp(shname, "xdp", 3) == 0 || |
1c47910e | 567 | memcmp(shname, "perf_event", 10) == 0 || |
4f2e7ae5 | 568 | memcmp(shname, "socket", 6) == 0 || |
40304b2a LB |
569 | memcmp(shname, "cgroup/", 7) == 0 || |
570 | memcmp(shname, "sockops", 7) == 0) | |
249b812d AS |
571 | load_and_attach(shname, data->d_buf, data->d_size); |
572 | } | |
573 | ||
9fd63d05 MKL |
574 | ret = 0; |
575 | done: | |
249b812d | 576 | close(fd); |
9fd63d05 MKL |
577 | return ret; |
578 | } | |
579 | ||
580 | int load_bpf_file(char *path) | |
581 | { | |
582 | return do_load_bpf_file(path, NULL); | |
583 | } | |
584 | ||
585 | int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map) | |
586 | { | |
587 | return do_load_bpf_file(path, fixup_map); | |
249b812d | 588 | } |
b896c4f9 AS |
589 | |
590 | void read_trace_pipe(void) | |
591 | { | |
592 | int trace_fd; | |
593 | ||
594 | trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0); | |
595 | if (trace_fd < 0) | |
596 | return; | |
597 | ||
598 | while (1) { | |
599 | static char buf[4096]; | |
600 | ssize_t sz; | |
601 | ||
602 | sz = read(trace_fd, buf, sizeof(buf)); | |
603 | if (sz > 0) { | |
604 | buf[sz] = 0; | |
605 | puts(buf); | |
606 | } | |
607 | } | |
608 | } | |
3622e7e4 AS |
609 | |
610 | #define MAX_SYMS 300000 | |
611 | static struct ksym syms[MAX_SYMS]; | |
612 | static int sym_cnt; | |
613 | ||
614 | static int ksym_cmp(const void *p1, const void *p2) | |
615 | { | |
616 | return ((struct ksym *)p1)->addr - ((struct ksym *)p2)->addr; | |
617 | } | |
618 | ||
619 | int load_kallsyms(void) | |
620 | { | |
621 | FILE *f = fopen("/proc/kallsyms", "r"); | |
622 | char func[256], buf[256]; | |
623 | char symbol; | |
624 | void *addr; | |
625 | int i = 0; | |
626 | ||
627 | if (!f) | |
628 | return -ENOENT; | |
629 | ||
630 | while (!feof(f)) { | |
631 | if (!fgets(buf, sizeof(buf), f)) | |
632 | break; | |
633 | if (sscanf(buf, "%p %c %s", &addr, &symbol, func) != 3) | |
634 | break; | |
635 | if (!addr) | |
636 | continue; | |
637 | syms[i].addr = (long) addr; | |
638 | syms[i].name = strdup(func); | |
639 | i++; | |
640 | } | |
641 | sym_cnt = i; | |
642 | qsort(syms, sym_cnt, sizeof(struct ksym), ksym_cmp); | |
643 | return 0; | |
644 | } | |
645 | ||
646 | struct ksym *ksym_search(long key) | |
647 | { | |
648 | int start = 0, end = sym_cnt; | |
649 | int result; | |
650 | ||
651 | while (start < end) { | |
652 | size_t mid = start + (end - start) / 2; | |
653 | ||
654 | result = key - syms[mid].addr; | |
655 | if (result < 0) | |
656 | end = mid; | |
657 | else if (result > 0) | |
658 | start = mid + 1; | |
659 | else | |
660 | return &syms[mid]; | |
661 | } | |
662 | ||
663 | if (start >= 1 && syms[start - 1].addr < key && | |
664 | key < syms[start].addr) | |
665 | /* valid ksym */ | |
666 | return &syms[start - 1]; | |
667 | ||
668 | /* out of range. return _stext */ | |
669 | return &syms[0]; | |
670 | } | |
12d8bb64 | 671 | |
6387d011 | 672 | int set_link_xdp_fd(int ifindex, int fd, __u32 flags) |
12d8bb64 MKL |
673 | { |
674 | struct sockaddr_nl sa; | |
675 | int sock, seq = 0, len, ret = -1; | |
676 | char buf[4096]; | |
677 | struct nlattr *nla, *nla_xdp; | |
678 | struct { | |
679 | struct nlmsghdr nh; | |
680 | struct ifinfomsg ifinfo; | |
681 | char attrbuf[64]; | |
682 | } req; | |
683 | struct nlmsghdr *nh; | |
684 | struct nlmsgerr *err; | |
685 | ||
686 | memset(&sa, 0, sizeof(sa)); | |
687 | sa.nl_family = AF_NETLINK; | |
688 | ||
689 | sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); | |
690 | if (sock < 0) { | |
691 | printf("open netlink socket: %s\n", strerror(errno)); | |
692 | return -1; | |
693 | } | |
694 | ||
695 | if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) { | |
696 | printf("bind to netlink: %s\n", strerror(errno)); | |
697 | goto cleanup; | |
698 | } | |
699 | ||
700 | memset(&req, 0, sizeof(req)); | |
701 | req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)); | |
702 | req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; | |
703 | req.nh.nlmsg_type = RTM_SETLINK; | |
704 | req.nh.nlmsg_pid = 0; | |
705 | req.nh.nlmsg_seq = ++seq; | |
706 | req.ifinfo.ifi_family = AF_UNSPEC; | |
707 | req.ifinfo.ifi_index = ifindex; | |
3993f2cb DA |
708 | |
709 | /* started nested attribute for XDP */ | |
12d8bb64 MKL |
710 | nla = (struct nlattr *)(((char *)&req) |
711 | + NLMSG_ALIGN(req.nh.nlmsg_len)); | |
712 | nla->nla_type = NLA_F_NESTED | 43/*IFLA_XDP*/; | |
3993f2cb | 713 | nla->nla_len = NLA_HDRLEN; |
12d8bb64 | 714 | |
3993f2cb DA |
715 | /* add XDP fd */ |
716 | nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len); | |
12d8bb64 MKL |
717 | nla_xdp->nla_type = 1/*IFLA_XDP_FD*/; |
718 | nla_xdp->nla_len = NLA_HDRLEN + sizeof(int); | |
719 | memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd)); | |
3993f2cb DA |
720 | nla->nla_len += nla_xdp->nla_len; |
721 | ||
722 | /* if user passed in any flags, add those too */ | |
723 | if (flags) { | |
724 | nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len); | |
725 | nla_xdp->nla_type = 3/*IFLA_XDP_FLAGS*/; | |
726 | nla_xdp->nla_len = NLA_HDRLEN + sizeof(flags); | |
727 | memcpy((char *)nla_xdp + NLA_HDRLEN, &flags, sizeof(flags)); | |
728 | nla->nla_len += nla_xdp->nla_len; | |
729 | } | |
12d8bb64 MKL |
730 | |
731 | req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len); | |
732 | ||
733 | if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) { | |
734 | printf("send to netlink: %s\n", strerror(errno)); | |
735 | goto cleanup; | |
736 | } | |
737 | ||
738 | len = recv(sock, buf, sizeof(buf), 0); | |
739 | if (len < 0) { | |
740 | printf("recv from netlink: %s\n", strerror(errno)); | |
741 | goto cleanup; | |
742 | } | |
743 | ||
744 | for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len); | |
745 | nh = NLMSG_NEXT(nh, len)) { | |
746 | if (nh->nlmsg_pid != getpid()) { | |
747 | printf("Wrong pid %d, expected %d\n", | |
748 | nh->nlmsg_pid, getpid()); | |
749 | goto cleanup; | |
750 | } | |
751 | if (nh->nlmsg_seq != seq) { | |
752 | printf("Wrong seq %d, expected %d\n", | |
753 | nh->nlmsg_seq, seq); | |
754 | goto cleanup; | |
755 | } | |
756 | switch (nh->nlmsg_type) { | |
757 | case NLMSG_ERROR: | |
758 | err = (struct nlmsgerr *)NLMSG_DATA(nh); | |
759 | if (!err->error) | |
760 | continue; | |
761 | printf("nlmsg error %s\n", strerror(-err->error)); | |
762 | goto cleanup; | |
763 | case NLMSG_DONE: | |
764 | break; | |
765 | } | |
766 | } | |
767 | ||
768 | ret = 0; | |
769 | ||
770 | cleanup: | |
771 | close(sock); | |
772 | return ret; | |
773 | } |