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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
249b812d AS |
2 | #include <stdio.h> |
3 | #include <sys/types.h> | |
4 | #include <sys/stat.h> | |
5 | #include <fcntl.h> | |
6 | #include <libelf.h> | |
7 | #include <gelf.h> | |
8 | #include <errno.h> | |
9 | #include <unistd.h> | |
10 | #include <string.h> | |
11 | #include <stdbool.h> | |
b896c4f9 | 12 | #include <stdlib.h> |
249b812d AS |
13 | #include <linux/bpf.h> |
14 | #include <linux/filter.h> | |
b896c4f9 | 15 | #include <linux/perf_event.h> |
12d8bb64 MKL |
16 | #include <linux/netlink.h> |
17 | #include <linux/rtnetlink.h> | |
6387d011 | 18 | #include <linux/types.h> |
12d8bb64 MKL |
19 | #include <sys/types.h> |
20 | #include <sys/socket.h> | |
b896c4f9 AS |
21 | #include <sys/syscall.h> |
22 | #include <sys/ioctl.h> | |
23 | #include <sys/mman.h> | |
24 | #include <poll.h> | |
5bacd780 | 25 | #include <ctype.h> |
9fd63d05 | 26 | #include <assert.h> |
2bf3e2ef | 27 | #include <bpf/bpf.h> |
249b812d | 28 | #include "bpf_load.h" |
205c8ada | 29 | #include "perf-sys.h" |
249b812d | 30 | |
b896c4f9 AS |
31 | #define DEBUGFS "/sys/kernel/debug/tracing/" |
32 | ||
249b812d | 33 | static char license[128]; |
b896c4f9 | 34 | static int kern_version; |
249b812d | 35 | static bool processed_sec[128]; |
d40fc181 | 36 | char bpf_log_buf[BPF_LOG_BUF_SIZE]; |
249b812d AS |
37 | int map_fd[MAX_MAPS]; |
38 | int prog_fd[MAX_PROGS]; | |
b896c4f9 | 39 | int event_fd[MAX_PROGS]; |
249b812d | 40 | int prog_cnt; |
5bacd780 AS |
41 | int prog_array_fd = -1; |
42 | ||
156450d9 JDB |
43 | struct bpf_map_data map_data[MAX_MAPS]; |
44 | int map_data_count = 0; | |
45 | ||
5bacd780 AS |
46 | static int populate_prog_array(const char *event, int prog_fd) |
47 | { | |
48 | int ind = atoi(event), err; | |
49 | ||
d40fc181 | 50 | err = bpf_map_update_elem(prog_array_fd, &ind, &prog_fd, BPF_ANY); |
5bacd780 AS |
51 | if (err < 0) { |
52 | printf("failed to store prog_fd in prog_array\n"); | |
53 | return -1; | |
54 | } | |
55 | return 0; | |
56 | } | |
249b812d AS |
57 | |
58 | static int load_and_attach(const char *event, struct bpf_insn *prog, int size) | |
59 | { | |
249b812d | 60 | bool is_socket = strncmp(event, "socket", 6) == 0; |
b896c4f9 AS |
61 | bool is_kprobe = strncmp(event, "kprobe/", 7) == 0; |
62 | bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0; | |
c0766040 | 63 | bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0; |
4662a4e5 | 64 | bool is_raw_tracepoint = strncmp(event, "raw_tracepoint/", 15) == 0; |
86af8b41 | 65 | bool is_xdp = strncmp(event, "xdp", 3) == 0; |
1c47910e | 66 | bool is_perf_event = strncmp(event, "perf_event", 10) == 0; |
4f2e7ae5 DA |
67 | bool is_cgroup_skb = strncmp(event, "cgroup/skb", 10) == 0; |
68 | bool is_cgroup_sk = strncmp(event, "cgroup/sock", 11) == 0; | |
40304b2a | 69 | bool is_sockops = strncmp(event, "sockops", 7) == 0; |
69e8cc13 | 70 | bool is_sk_skb = strncmp(event, "sk_skb", 6) == 0; |
4c4c3c27 | 71 | bool is_sk_msg = strncmp(event, "sk_msg", 6) == 0; |
43371c83 | 72 | size_t insns_cnt = size / sizeof(struct bpf_insn); |
b896c4f9 AS |
73 | enum bpf_prog_type prog_type; |
74 | char buf[256]; | |
75 | int fd, efd, err, id; | |
76 | struct perf_event_attr attr = {}; | |
77 | ||
78 | attr.type = PERF_TYPE_TRACEPOINT; | |
79 | attr.sample_type = PERF_SAMPLE_RAW; | |
80 | attr.sample_period = 1; | |
81 | attr.wakeup_events = 1; | |
82 | ||
83 | if (is_socket) { | |
84 | prog_type = BPF_PROG_TYPE_SOCKET_FILTER; | |
85 | } else if (is_kprobe || is_kretprobe) { | |
86 | prog_type = BPF_PROG_TYPE_KPROBE; | |
c0766040 AS |
87 | } else if (is_tracepoint) { |
88 | prog_type = BPF_PROG_TYPE_TRACEPOINT; | |
4662a4e5 AS |
89 | } else if (is_raw_tracepoint) { |
90 | prog_type = BPF_PROG_TYPE_RAW_TRACEPOINT; | |
86af8b41 BB |
91 | } else if (is_xdp) { |
92 | prog_type = BPF_PROG_TYPE_XDP; | |
1c47910e AS |
93 | } else if (is_perf_event) { |
94 | prog_type = BPF_PROG_TYPE_PERF_EVENT; | |
4f2e7ae5 DA |
95 | } else if (is_cgroup_skb) { |
96 | prog_type = BPF_PROG_TYPE_CGROUP_SKB; | |
97 | } else if (is_cgroup_sk) { | |
98 | prog_type = BPF_PROG_TYPE_CGROUP_SOCK; | |
40304b2a LB |
99 | } else if (is_sockops) { |
100 | prog_type = BPF_PROG_TYPE_SOCK_OPS; | |
69e8cc13 JF |
101 | } else if (is_sk_skb) { |
102 | prog_type = BPF_PROG_TYPE_SK_SKB; | |
4c4c3c27 JF |
103 | } else if (is_sk_msg) { |
104 | prog_type = BPF_PROG_TYPE_SK_MSG; | |
b896c4f9 AS |
105 | } else { |
106 | printf("Unknown event '%s'\n", event); | |
249b812d | 107 | return -1; |
b896c4f9 AS |
108 | } |
109 | ||
b0294bc1 DC |
110 | if (prog_cnt == MAX_PROGS) |
111 | return -1; | |
112 | ||
43371c83 | 113 | fd = bpf_load_program(prog_type, prog, insns_cnt, license, kern_version, |
d40fc181 | 114 | bpf_log_buf, BPF_LOG_BUF_SIZE); |
5bacd780 | 115 | if (fd < 0) { |
d40fc181 | 116 | printf("bpf_load_program() err=%d\n%s", errno, bpf_log_buf); |
5bacd780 AS |
117 | return -1; |
118 | } | |
119 | ||
120 | prog_fd[prog_cnt++] = fd; | |
121 | ||
4f2e7ae5 | 122 | if (is_xdp || is_perf_event || is_cgroup_skb || is_cgroup_sk) |
86af8b41 BB |
123 | return 0; |
124 | ||
4c4c3c27 | 125 | if (is_socket || is_sockops || is_sk_skb || is_sk_msg) { |
40304b2a LB |
126 | if (is_socket) |
127 | event += 6; | |
128 | else | |
129 | event += 7; | |
5bacd780 AS |
130 | if (*event != '/') |
131 | return 0; | |
132 | event++; | |
133 | if (!isdigit(*event)) { | |
134 | printf("invalid prog number\n"); | |
135 | return -1; | |
136 | } | |
137 | return populate_prog_array(event, fd); | |
138 | } | |
139 | ||
4662a4e5 AS |
140 | if (is_raw_tracepoint) { |
141 | efd = bpf_raw_tracepoint_open(event + 15, fd); | |
142 | if (efd < 0) { | |
143 | printf("tracepoint %s %s\n", event + 15, strerror(errno)); | |
144 | return -1; | |
145 | } | |
146 | event_fd[prog_cnt - 1] = efd; | |
147 | return 0; | |
148 | } | |
149 | ||
b896c4f9 | 150 | if (is_kprobe || is_kretprobe) { |
34745aed YS |
151 | bool need_normal_check = true; |
152 | const char *event_prefix = ""; | |
153 | ||
b896c4f9 AS |
154 | if (is_kprobe) |
155 | event += 7; | |
156 | else | |
157 | event += 10; | |
158 | ||
5bacd780 AS |
159 | if (*event == 0) { |
160 | printf("event name cannot be empty\n"); | |
161 | return -1; | |
162 | } | |
163 | ||
164 | if (isdigit(*event)) | |
165 | return populate_prog_array(event, fd); | |
166 | ||
34745aed YS |
167 | #ifdef __x86_64__ |
168 | if (strncmp(event, "sys_", 4) == 0) { | |
169 | snprintf(buf, sizeof(buf), | |
170 | "echo '%c:__x64_%s __x64_%s' >> /sys/kernel/debug/tracing/kprobe_events", | |
171 | is_kprobe ? 'p' : 'r', event, event); | |
172 | err = system(buf); | |
173 | if (err >= 0) { | |
174 | need_normal_check = false; | |
175 | event_prefix = "__x64_"; | |
176 | } | |
177 | } | |
178 | #endif | |
179 | if (need_normal_check) { | |
180 | snprintf(buf, sizeof(buf), | |
181 | "echo '%c:%s %s' >> /sys/kernel/debug/tracing/kprobe_events", | |
182 | is_kprobe ? 'p' : 'r', event, event); | |
183 | err = system(buf); | |
184 | if (err < 0) { | |
185 | printf("failed to create kprobe '%s' error '%s'\n", | |
186 | event, strerror(errno)); | |
187 | return -1; | |
188 | } | |
b896c4f9 | 189 | } |
249b812d | 190 | |
c0766040 AS |
191 | strcpy(buf, DEBUGFS); |
192 | strcat(buf, "events/kprobes/"); | |
34745aed | 193 | strcat(buf, event_prefix); |
c0766040 AS |
194 | strcat(buf, event); |
195 | strcat(buf, "/id"); | |
196 | } else if (is_tracepoint) { | |
197 | event += 11; | |
198 | ||
199 | if (*event == 0) { | |
200 | printf("event name cannot be empty\n"); | |
201 | return -1; | |
202 | } | |
203 | strcpy(buf, DEBUGFS); | |
204 | strcat(buf, "events/"); | |
205 | strcat(buf, event); | |
206 | strcat(buf, "/id"); | |
207 | } | |
b896c4f9 AS |
208 | |
209 | efd = open(buf, O_RDONLY, 0); | |
210 | if (efd < 0) { | |
211 | printf("failed to open event %s\n", event); | |
212 | return -1; | |
213 | } | |
214 | ||
215 | err = read(efd, buf, sizeof(buf)); | |
216 | if (err < 0 || err >= sizeof(buf)) { | |
217 | printf("read from '%s' failed '%s'\n", event, strerror(errno)); | |
218 | return -1; | |
219 | } | |
220 | ||
221 | close(efd); | |
222 | ||
223 | buf[err] = 0; | |
224 | id = atoi(buf); | |
225 | attr.config = id; | |
226 | ||
205c8ada | 227 | efd = sys_perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0); |
b896c4f9 AS |
228 | if (efd < 0) { |
229 | printf("event %d fd %d err %s\n", id, efd, strerror(errno)); | |
230 | return -1; | |
231 | } | |
232 | event_fd[prog_cnt - 1] = efd; | |
0ec9552b YS |
233 | err = ioctl(efd, PERF_EVENT_IOC_ENABLE, 0); |
234 | if (err < 0) { | |
235 | printf("ioctl PERF_EVENT_IOC_ENABLE failed err %s\n", | |
236 | strerror(errno)); | |
237 | return -1; | |
238 | } | |
239 | err = ioctl(efd, PERF_EVENT_IOC_SET_BPF, fd); | |
240 | if (err < 0) { | |
241 | printf("ioctl PERF_EVENT_IOC_SET_BPF failed err %s\n", | |
242 | strerror(errno)); | |
243 | return -1; | |
244 | } | |
b896c4f9 | 245 | |
249b812d AS |
246 | return 0; |
247 | } | |
248 | ||
156450d9 JDB |
249 | static int load_maps(struct bpf_map_data *maps, int nr_maps, |
250 | fixup_map_cb fixup_map) | |
249b812d | 251 | { |
ad17d0e6 | 252 | int i, numa_node; |
156450d9 | 253 | |
5010e948 | 254 | for (i = 0; i < nr_maps; i++) { |
6979bcc7 JDB |
255 | if (fixup_map) { |
256 | fixup_map(&maps[i], i); | |
257 | /* Allow userspace to assign map FD prior to creation */ | |
258 | if (maps[i].fd != -1) { | |
259 | map_fd[i] = maps[i].fd; | |
260 | continue; | |
261 | } | |
262 | } | |
249b812d | 263 | |
ad17d0e6 MKL |
264 | numa_node = maps[i].def.map_flags & BPF_F_NUMA_NODE ? |
265 | maps[i].def.numa_node : -1; | |
266 | ||
156450d9 JDB |
267 | if (maps[i].def.type == BPF_MAP_TYPE_ARRAY_OF_MAPS || |
268 | maps[i].def.type == BPF_MAP_TYPE_HASH_OF_MAPS) { | |
269 | int inner_map_fd = map_fd[maps[i].def.inner_map_idx]; | |
fb30d4b7 | 270 | |
ad17d0e6 | 271 | map_fd[i] = bpf_create_map_in_map_node(maps[i].def.type, |
88cda1c9 | 272 | maps[i].name, |
156450d9 JDB |
273 | maps[i].def.key_size, |
274 | inner_map_fd, | |
275 | maps[i].def.max_entries, | |
ad17d0e6 MKL |
276 | maps[i].def.map_flags, |
277 | numa_node); | |
fb30d4b7 | 278 | } else { |
ad17d0e6 | 279 | map_fd[i] = bpf_create_map_node(maps[i].def.type, |
88cda1c9 | 280 | maps[i].name, |
ad17d0e6 MKL |
281 | maps[i].def.key_size, |
282 | maps[i].def.value_size, | |
283 | maps[i].def.max_entries, | |
284 | maps[i].def.map_flags, | |
285 | numa_node); | |
fb30d4b7 | 286 | } |
618ec9a7 AS |
287 | if (map_fd[i] < 0) { |
288 | printf("failed to create a map: %d %s\n", | |
289 | errno, strerror(errno)); | |
249b812d | 290 | return 1; |
618ec9a7 | 291 | } |
156450d9 | 292 | maps[i].fd = map_fd[i]; |
5bacd780 | 293 | |
156450d9 | 294 | if (maps[i].def.type == BPF_MAP_TYPE_PROG_ARRAY) |
5bacd780 | 295 | prog_array_fd = map_fd[i]; |
249b812d AS |
296 | } |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int get_sec(Elf *elf, int i, GElf_Ehdr *ehdr, char **shname, | |
301 | GElf_Shdr *shdr, Elf_Data **data) | |
302 | { | |
303 | Elf_Scn *scn; | |
304 | ||
305 | scn = elf_getscn(elf, i); | |
306 | if (!scn) | |
307 | return 1; | |
308 | ||
309 | if (gelf_getshdr(scn, shdr) != shdr) | |
310 | return 2; | |
311 | ||
312 | *shname = elf_strptr(elf, ehdr->e_shstrndx, shdr->sh_name); | |
313 | if (!*shname || !shdr->sh_size) | |
314 | return 3; | |
315 | ||
316 | *data = elf_getdata(scn, 0); | |
317 | if (!*data || elf_getdata(scn, *data) != NULL) | |
318 | return 4; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static int parse_relo_and_apply(Elf_Data *data, Elf_Data *symbols, | |
156450d9 JDB |
324 | GElf_Shdr *shdr, struct bpf_insn *insn, |
325 | struct bpf_map_data *maps, int nr_maps) | |
249b812d AS |
326 | { |
327 | int i, nrels; | |
328 | ||
329 | nrels = shdr->sh_size / shdr->sh_entsize; | |
330 | ||
331 | for (i = 0; i < nrels; i++) { | |
332 | GElf_Sym sym; | |
333 | GElf_Rel rel; | |
334 | unsigned int insn_idx; | |
156450d9 JDB |
335 | bool match = false; |
336 | int j, map_idx; | |
249b812d AS |
337 | |
338 | gelf_getrel(data, i, &rel); | |
339 | ||
340 | insn_idx = rel.r_offset / sizeof(struct bpf_insn); | |
341 | ||
342 | gelf_getsym(symbols, GELF_R_SYM(rel.r_info), &sym); | |
343 | ||
344 | if (insn[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) { | |
345 | printf("invalid relo for insn[%d].code 0x%x\n", | |
346 | insn_idx, insn[insn_idx].code); | |
347 | return 1; | |
348 | } | |
349 | insn[insn_idx].src_reg = BPF_PSEUDO_MAP_FD; | |
156450d9 JDB |
350 | |
351 | /* Match FD relocation against recorded map_data[] offset */ | |
352 | for (map_idx = 0; map_idx < nr_maps; map_idx++) { | |
353 | if (maps[map_idx].elf_offset == sym.st_value) { | |
354 | match = true; | |
355 | break; | |
356 | } | |
357 | } | |
358 | if (match) { | |
359 | insn[insn_idx].imm = maps[map_idx].fd; | |
360 | } else { | |
361 | printf("invalid relo for insn[%d] no map_data match\n", | |
362 | insn_idx); | |
363 | return 1; | |
364 | } | |
249b812d AS |
365 | } |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
9fd63d05 MKL |
370 | static int cmp_symbols(const void *l, const void *r) |
371 | { | |
372 | const GElf_Sym *lsym = (const GElf_Sym *)l; | |
373 | const GElf_Sym *rsym = (const GElf_Sym *)r; | |
374 | ||
375 | if (lsym->st_value < rsym->st_value) | |
376 | return -1; | |
377 | else if (lsym->st_value > rsym->st_value) | |
378 | return 1; | |
379 | else | |
380 | return 0; | |
381 | } | |
382 | ||
156450d9 JDB |
383 | static int load_elf_maps_section(struct bpf_map_data *maps, int maps_shndx, |
384 | Elf *elf, Elf_Data *symbols, int strtabidx) | |
9fd63d05 | 385 | { |
156450d9 JDB |
386 | int map_sz_elf, map_sz_copy; |
387 | bool validate_zero = false; | |
388 | Elf_Data *data_maps; | |
389 | int i, nr_maps; | |
390 | GElf_Sym *sym; | |
391 | Elf_Scn *scn; | |
392 | int copy_sz; | |
393 | ||
394 | if (maps_shndx < 0) | |
395 | return -EINVAL; | |
396 | if (!symbols) | |
397 | return -EINVAL; | |
398 | ||
399 | /* Get data for maps section via elf index */ | |
400 | scn = elf_getscn(elf, maps_shndx); | |
401 | if (scn) | |
402 | data_maps = elf_getdata(scn, NULL); | |
403 | if (!scn || !data_maps) { | |
404 | printf("Failed to get Elf_Data from maps section %d\n", | |
405 | maps_shndx); | |
406 | return -EINVAL; | |
407 | } | |
9fd63d05 | 408 | |
156450d9 JDB |
409 | /* For each map get corrosponding symbol table entry */ |
410 | sym = calloc(MAX_MAPS+1, sizeof(GElf_Sym)); | |
411 | for (i = 0, nr_maps = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) { | |
412 | assert(nr_maps < MAX_MAPS+1); | |
413 | if (!gelf_getsym(symbols, i, &sym[nr_maps])) | |
9fd63d05 | 414 | continue; |
156450d9 | 415 | if (sym[nr_maps].st_shndx != maps_shndx) |
9fd63d05 | 416 | continue; |
156450d9 | 417 | /* Only increment iif maps section */ |
9fd63d05 MKL |
418 | nr_maps++; |
419 | } | |
420 | ||
156450d9 JDB |
421 | /* Align to map_fd[] order, via sort on offset in sym.st_value */ |
422 | qsort(sym, nr_maps, sizeof(GElf_Sym), cmp_symbols); | |
423 | ||
424 | /* Keeping compatible with ELF maps section changes | |
425 | * ------------------------------------------------ | |
74662ea5 | 426 | * The program size of struct bpf_load_map_def is known by loader |
156450d9 JDB |
427 | * code, but struct stored in ELF file can be different. |
428 | * | |
429 | * Unfortunately sym[i].st_size is zero. To calculate the | |
430 | * struct size stored in the ELF file, assume all struct have | |
431 | * the same size, and simply divide with number of map | |
432 | * symbols. | |
433 | */ | |
434 | map_sz_elf = data_maps->d_size / nr_maps; | |
74662ea5 | 435 | map_sz_copy = sizeof(struct bpf_load_map_def); |
156450d9 JDB |
436 | if (map_sz_elf < map_sz_copy) { |
437 | /* | |
438 | * Backward compat, loading older ELF file with | |
439 | * smaller struct, keeping remaining bytes zero. | |
440 | */ | |
441 | map_sz_copy = map_sz_elf; | |
442 | } else if (map_sz_elf > map_sz_copy) { | |
443 | /* | |
444 | * Forward compat, loading newer ELF file with larger | |
445 | * struct with unknown features. Assume zero means | |
446 | * feature not used. Thus, validate rest of struct | |
447 | * data is zero. | |
448 | */ | |
449 | validate_zero = true; | |
450 | } | |
9fd63d05 | 451 | |
156450d9 | 452 | /* Memcpy relevant part of ELF maps data to loader maps */ |
9fd63d05 | 453 | for (i = 0; i < nr_maps; i++) { |
74662ea5 | 454 | struct bpf_load_map_def *def; |
156450d9 | 455 | unsigned char *addr, *end; |
156450d9 JDB |
456 | const char *map_name; |
457 | size_t offset; | |
458 | ||
459 | map_name = elf_strptr(elf, strtabidx, sym[i].st_name); | |
460 | maps[i].name = strdup(map_name); | |
461 | if (!maps[i].name) { | |
9fd63d05 MKL |
462 | printf("strdup(%s): %s(%d)\n", map_name, |
463 | strerror(errno), errno); | |
156450d9 JDB |
464 | free(sym); |
465 | return -errno; | |
466 | } | |
467 | ||
468 | /* Symbol value is offset into ELF maps section data area */ | |
469 | offset = sym[i].st_value; | |
74662ea5 | 470 | def = (struct bpf_load_map_def *)(data_maps->d_buf + offset); |
156450d9 | 471 | maps[i].elf_offset = offset; |
74662ea5 | 472 | memset(&maps[i].def, 0, sizeof(struct bpf_load_map_def)); |
156450d9 JDB |
473 | memcpy(&maps[i].def, def, map_sz_copy); |
474 | ||
475 | /* Verify no newer features were requested */ | |
476 | if (validate_zero) { | |
477 | addr = (unsigned char*) def + map_sz_copy; | |
478 | end = (unsigned char*) def + map_sz_elf; | |
479 | for (; addr < end; addr++) { | |
480 | if (*addr != 0) { | |
481 | free(sym); | |
482 | return -EFBIG; | |
483 | } | |
484 | } | |
9fd63d05 MKL |
485 | } |
486 | } | |
487 | ||
156450d9 | 488 | free(sym); |
5010e948 | 489 | return nr_maps; |
9fd63d05 MKL |
490 | } |
491 | ||
492 | static int do_load_bpf_file(const char *path, fixup_map_cb fixup_map) | |
249b812d | 493 | { |
9fd63d05 | 494 | int fd, i, ret, maps_shndx = -1, strtabidx = -1; |
249b812d AS |
495 | Elf *elf; |
496 | GElf_Ehdr ehdr; | |
497 | GElf_Shdr shdr, shdr_prog; | |
9fd63d05 | 498 | Elf_Data *data, *data_prog, *data_maps = NULL, *symbols = NULL; |
156450d9 JDB |
499 | char *shname, *shname_prog; |
500 | int nr_maps = 0; | |
249b812d | 501 | |
a734fb5d MS |
502 | /* reset global variables */ |
503 | kern_version = 0; | |
504 | memset(license, 0, sizeof(license)); | |
505 | memset(processed_sec, 0, sizeof(processed_sec)); | |
506 | ||
249b812d AS |
507 | if (elf_version(EV_CURRENT) == EV_NONE) |
508 | return 1; | |
509 | ||
510 | fd = open(path, O_RDONLY, 0); | |
511 | if (fd < 0) | |
512 | return 1; | |
513 | ||
514 | elf = elf_begin(fd, ELF_C_READ, NULL); | |
515 | ||
516 | if (!elf) | |
517 | return 1; | |
518 | ||
519 | if (gelf_getehdr(elf, &ehdr) != &ehdr) | |
520 | return 1; | |
521 | ||
b896c4f9 AS |
522 | /* clear all kprobes */ |
523 | i = system("echo \"\" > /sys/kernel/debug/tracing/kprobe_events"); | |
524 | ||
249b812d AS |
525 | /* scan over all elf sections to get license and map info */ |
526 | for (i = 1; i < ehdr.e_shnum; i++) { | |
527 | ||
528 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
529 | continue; | |
530 | ||
531 | if (0) /* helpful for llvm debugging */ | |
532 | printf("section %d:%s data %p size %zd link %d flags %d\n", | |
533 | i, shname, data->d_buf, data->d_size, | |
534 | shdr.sh_link, (int) shdr.sh_flags); | |
535 | ||
536 | if (strcmp(shname, "license") == 0) { | |
537 | processed_sec[i] = true; | |
538 | memcpy(license, data->d_buf, data->d_size); | |
b896c4f9 AS |
539 | } else if (strcmp(shname, "version") == 0) { |
540 | processed_sec[i] = true; | |
541 | if (data->d_size != sizeof(int)) { | |
542 | printf("invalid size of version section %zd\n", | |
543 | data->d_size); | |
544 | return 1; | |
545 | } | |
546 | memcpy(&kern_version, data->d_buf, sizeof(int)); | |
249b812d | 547 | } else if (strcmp(shname, "maps") == 0) { |
156450d9 JDB |
548 | int j; |
549 | ||
9fd63d05 MKL |
550 | maps_shndx = i; |
551 | data_maps = data; | |
156450d9 JDB |
552 | for (j = 0; j < MAX_MAPS; j++) |
553 | map_data[j].fd = -1; | |
249b812d | 554 | } else if (shdr.sh_type == SHT_SYMTAB) { |
9fd63d05 | 555 | strtabidx = shdr.sh_link; |
249b812d AS |
556 | symbols = data; |
557 | } | |
558 | } | |
559 | ||
9fd63d05 MKL |
560 | ret = 1; |
561 | ||
562 | if (!symbols) { | |
563 | printf("missing SHT_SYMTAB section\n"); | |
564 | goto done; | |
565 | } | |
566 | ||
567 | if (data_maps) { | |
156450d9 JDB |
568 | nr_maps = load_elf_maps_section(map_data, maps_shndx, |
569 | elf, symbols, strtabidx); | |
570 | if (nr_maps < 0) { | |
571 | printf("Error: Failed loading ELF maps (errno:%d):%s\n", | |
572 | nr_maps, strerror(-nr_maps)); | |
5010e948 JDB |
573 | goto done; |
574 | } | |
156450d9 | 575 | if (load_maps(map_data, nr_maps, fixup_map)) |
9fd63d05 | 576 | goto done; |
156450d9 | 577 | map_data_count = nr_maps; |
9fd63d05 MKL |
578 | |
579 | processed_sec[maps_shndx] = true; | |
580 | } | |
581 | ||
7bc57950 | 582 | /* process all relo sections, and rewrite bpf insns for maps */ |
249b812d | 583 | for (i = 1; i < ehdr.e_shnum; i++) { |
16ad1329 MS |
584 | if (processed_sec[i]) |
585 | continue; | |
249b812d AS |
586 | |
587 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
588 | continue; | |
7bc57950 | 589 | |
249b812d AS |
590 | if (shdr.sh_type == SHT_REL) { |
591 | struct bpf_insn *insns; | |
592 | ||
7bc57950 | 593 | /* locate prog sec that need map fixup (relocations) */ |
249b812d AS |
594 | if (get_sec(elf, shdr.sh_info, &ehdr, &shname_prog, |
595 | &shdr_prog, &data_prog)) | |
596 | continue; | |
597 | ||
db6a71dd AS |
598 | if (shdr_prog.sh_type != SHT_PROGBITS || |
599 | !(shdr_prog.sh_flags & SHF_EXECINSTR)) | |
600 | continue; | |
601 | ||
249b812d | 602 | insns = (struct bpf_insn *) data_prog->d_buf; |
7bc57950 | 603 | processed_sec[i] = true; /* relo section */ |
249b812d | 604 | |
156450d9 JDB |
605 | if (parse_relo_and_apply(data, symbols, &shdr, insns, |
606 | map_data, nr_maps)) | |
249b812d | 607 | continue; |
249b812d AS |
608 | } |
609 | } | |
610 | ||
7bc57950 | 611 | /* load programs */ |
249b812d AS |
612 | for (i = 1; i < ehdr.e_shnum; i++) { |
613 | ||
614 | if (processed_sec[i]) | |
615 | continue; | |
616 | ||
617 | if (get_sec(elf, i, &ehdr, &shname, &shdr, &data)) | |
618 | continue; | |
619 | ||
b896c4f9 AS |
620 | if (memcmp(shname, "kprobe/", 7) == 0 || |
621 | memcmp(shname, "kretprobe/", 10) == 0 || | |
c0766040 | 622 | memcmp(shname, "tracepoint/", 11) == 0 || |
4662a4e5 | 623 | memcmp(shname, "raw_tracepoint/", 15) == 0 || |
86af8b41 | 624 | memcmp(shname, "xdp", 3) == 0 || |
1c47910e | 625 | memcmp(shname, "perf_event", 10) == 0 || |
4f2e7ae5 | 626 | memcmp(shname, "socket", 6) == 0 || |
40304b2a | 627 | memcmp(shname, "cgroup/", 7) == 0 || |
69e8cc13 | 628 | memcmp(shname, "sockops", 7) == 0 || |
4c4c3c27 JF |
629 | memcmp(shname, "sk_skb", 6) == 0 || |
630 | memcmp(shname, "sk_msg", 6) == 0) { | |
f856e469 LB |
631 | ret = load_and_attach(shname, data->d_buf, |
632 | data->d_size); | |
633 | if (ret != 0) | |
634 | goto done; | |
635 | } | |
249b812d AS |
636 | } |
637 | ||
9fd63d05 | 638 | done: |
249b812d | 639 | close(fd); |
9fd63d05 MKL |
640 | return ret; |
641 | } | |
642 | ||
643 | int load_bpf_file(char *path) | |
644 | { | |
645 | return do_load_bpf_file(path, NULL); | |
646 | } | |
647 | ||
648 | int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map) | |
649 | { | |
650 | return do_load_bpf_file(path, fixup_map); | |
249b812d | 651 | } |
b896c4f9 AS |
652 | |
653 | void read_trace_pipe(void) | |
654 | { | |
655 | int trace_fd; | |
656 | ||
657 | trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0); | |
658 | if (trace_fd < 0) | |
659 | return; | |
660 | ||
661 | while (1) { | |
662 | static char buf[4096]; | |
663 | ssize_t sz; | |
664 | ||
665 | sz = read(trace_fd, buf, sizeof(buf)); | |
666 | if (sz > 0) { | |
667 | buf[sz] = 0; | |
668 | puts(buf); | |
669 | } | |
670 | } | |
671 | } |