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36#include <ctype.h>
37#include <errno.h>
38#include <fcntl.h>
39#include <fts.h>
40#include <libgen.h>
41#include <mntent.h>
42#include <stdbool.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47#include <linux/limits.h>
48#include <linux/magic.h>
49#include <net/if.h>
50#include <sys/mount.h>
51#include <sys/stat.h>
52#include <sys/types.h>
53#include <sys/vfs.h>
54
55#include <bpf.h>
56
57#include "main.h"
58
59#ifndef BPF_FS_MAGIC
60#define BPF_FS_MAGIC 0xcafe4a11
61#endif
62
63void p_err(const char *fmt, ...)
64{
65 va_list ap;
66
67 va_start(ap, fmt);
68 if (json_output) {
69 jsonw_start_object(json_wtr);
70 jsonw_name(json_wtr, "error");
71 jsonw_vprintf_enquote(json_wtr, fmt, ap);
72 jsonw_end_object(json_wtr);
73 } else {
74 fprintf(stderr, "Error: ");
75 vfprintf(stderr, fmt, ap);
76 fprintf(stderr, "\n");
77 }
78 va_end(ap);
79}
80
81void p_info(const char *fmt, ...)
82{
83 va_list ap;
84
85 if (json_output)
86 return;
87
88 va_start(ap, fmt);
89 vfprintf(stderr, fmt, ap);
90 fprintf(stderr, "\n");
91 va_end(ap);
92}
93
94static bool is_bpffs(char *path)
95{
96 struct statfs st_fs;
97
98 if (statfs(path, &st_fs) < 0)
99 return false;
100
101 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
102}
103
104static int mnt_bpffs(const char *target, char *buff, size_t bufflen)
105{
106 bool bind_done = false;
107
108 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
109 if (errno != EINVAL || bind_done) {
110 snprintf(buff, bufflen,
111 "mount --make-private %s failed: %s",
112 target, strerror(errno));
113 return -1;
114 }
115
116 if (mount(target, target, "none", MS_BIND, NULL)) {
117 snprintf(buff, bufflen,
118 "mount --bind %s %s failed: %s",
119 target, target, strerror(errno));
120 return -1;
121 }
122
123 bind_done = true;
124 }
125
126 if (mount("bpf", target, "bpf", 0, "mode=0700")) {
127 snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s",
128 target, strerror(errno));
129 return -1;
130 }
131
132 return 0;
133}
134
135int open_obj_pinned(char *path)
136{
137 int fd;
138
139 fd = bpf_obj_get(path);
140 if (fd < 0) {
141 p_err("bpf obj get (%s): %s", path,
142 errno == EACCES && !is_bpffs(dirname(path)) ?
143 "directory not in bpf file system (bpffs)" :
144 strerror(errno));
145 return -1;
146 }
147
148 return fd;
149}
150
151int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
152{
153 enum bpf_obj_type type;
154 int fd;
155
156 fd = open_obj_pinned(path);
157 if (fd < 0)
158 return -1;
159
160 type = get_fd_type(fd);
161 if (type < 0) {
162 close(fd);
163 return type;
164 }
165 if (type != exp_type) {
166 p_err("incorrect object type: %s", get_fd_type_name(type));
167 close(fd);
168 return -1;
169 }
170
171 return fd;
172}
173
174int do_pin_fd(int fd, const char *name)
175{
176 char err_str[ERR_MAX_LEN];
177 char *file;
178 char *dir;
179 int err = 0;
180
181 err = bpf_obj_pin(fd, name);
182 if (!err)
183 goto out;
184
185 file = malloc(strlen(name) + 1);
186 strcpy(file, name);
187 dir = dirname(file);
188
189 if (errno != EPERM || is_bpffs(dir)) {
190 p_err("can't pin the object (%s): %s", name, strerror(errno));
191 goto out_free;
192 }
193
194
195 err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
196 if (!err) {
197 err = bpf_obj_pin(fd, name);
198 if (err)
199 p_err("can't pin the object (%s): %s", name,
200 strerror(errno));
201 } else {
202 err_str[ERR_MAX_LEN - 1] = '\0';
203 p_err("can't mount BPF file system to pin the object (%s): %s",
204 name, err_str);
205 }
206
207out_free:
208 free(file);
209out:
210 return err;
211}
212
213int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
214{
215 unsigned int id;
216 char *endptr;
217 int err;
218 int fd;
219
220 if (argc < 3) {
221 p_err("too few arguments, id ID and FILE path is required");
222 return -1;
223 } else if (argc > 3) {
224 p_err("too many arguments");
225 return -1;
226 }
227
228 if (!is_prefix(*argv, "id")) {
229 p_err("expected 'id' got %s", *argv);
230 return -1;
231 }
232 NEXT_ARG();
233
234 id = strtoul(*argv, &endptr, 0);
235 if (*endptr) {
236 p_err("can't parse %s as ID", *argv);
237 return -1;
238 }
239 NEXT_ARG();
240
241 fd = get_fd_by_id(id);
242 if (fd < 0) {
243 p_err("can't get prog by id (%u): %s", id, strerror(errno));
244 return -1;
245 }
246
247 err = do_pin_fd(fd, *argv);
248
249 close(fd);
250 return err;
251}
252
253const char *get_fd_type_name(enum bpf_obj_type type)
254{
255 static const char * const names[] = {
256 [BPF_OBJ_UNKNOWN] = "unknown",
257 [BPF_OBJ_PROG] = "prog",
258 [BPF_OBJ_MAP] = "map",
259 };
260
261 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
262 return names[BPF_OBJ_UNKNOWN];
263
264 return names[type];
265}
266
267int get_fd_type(int fd)
268{
269 char path[PATH_MAX];
270 char buf[512];
271 ssize_t n;
272
273 snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);
274
275 n = readlink(path, buf, sizeof(buf));
276 if (n < 0) {
277 p_err("can't read link type: %s", strerror(errno));
278 return -1;
279 }
280 if (n == sizeof(path)) {
281 p_err("can't read link type: path too long!");
282 return -1;
283 }
284
285 if (strstr(buf, "bpf-map"))
286 return BPF_OBJ_MAP;
287 else if (strstr(buf, "bpf-prog"))
288 return BPF_OBJ_PROG;
289
290 return BPF_OBJ_UNKNOWN;
291}
292
293char *get_fdinfo(int fd, const char *key)
294{
295 char path[PATH_MAX];
296 char *line = NULL;
297 size_t line_n = 0;
298 ssize_t n;
299 FILE *fdi;
300
301 snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd);
302
303 fdi = fopen(path, "r");
304 if (!fdi) {
305 p_err("can't open fdinfo: %s", strerror(errno));
306 return NULL;
307 }
308
309 while ((n = getline(&line, &line_n, fdi))) {
310 char *value;
311 int len;
312
313 if (!strstr(line, key))
314 continue;
315
316 fclose(fdi);
317
318 value = strchr(line, '\t');
319 if (!value || !value[1]) {
320 p_err("malformed fdinfo!?");
321 free(line);
322 return NULL;
323 }
324 value++;
325
326 len = strlen(value);
327 memmove(line, value, len);
328 line[len - 1] = '\0';
329
330 return line;
331 }
332
333 p_err("key '%s' not found in fdinfo", key);
334 free(line);
335 fclose(fdi);
336 return NULL;
337}
338
339void print_data_json(uint8_t *data, size_t len)
340{
341 unsigned int i;
342
343 jsonw_start_array(json_wtr);
344 for (i = 0; i < len; i++)
345 jsonw_printf(json_wtr, "%d", data[i]);
346 jsonw_end_array(json_wtr);
347}
348
349void print_hex_data_json(uint8_t *data, size_t len)
350{
351 unsigned int i;
352
353 jsonw_start_array(json_wtr);
354 for (i = 0; i < len; i++)
355 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
356 jsonw_end_array(json_wtr);
357}
358
359int build_pinned_obj_table(struct pinned_obj_table *tab,
360 enum bpf_obj_type type)
361{
362 struct bpf_prog_info pinned_info = {};
363 struct pinned_obj *obj_node = NULL;
364 __u32 len = sizeof(pinned_info);
365 struct mntent *mntent = NULL;
366 enum bpf_obj_type objtype;
367 FILE *mntfile = NULL;
368 FTSENT *ftse = NULL;
369 FTS *fts = NULL;
370 int fd, err;
371
372 mntfile = setmntent("/proc/mounts", "r");
373 if (!mntfile)
374 return -1;
375
376 while ((mntent = getmntent(mntfile))) {
377 char *path[] = { mntent->mnt_dir, NULL };
378
379 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
380 continue;
381
382 fts = fts_open(path, 0, NULL);
383 if (!fts)
384 continue;
385
386 while ((ftse = fts_read(fts))) {
387 if (!(ftse->fts_info & FTS_F))
388 continue;
389 fd = open_obj_pinned(ftse->fts_path);
390 if (fd < 0)
391 continue;
392
393 objtype = get_fd_type(fd);
394 if (objtype != type) {
395 close(fd);
396 continue;
397 }
398 memset(&pinned_info, 0, sizeof(pinned_info));
399 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
400 if (err) {
401 close(fd);
402 continue;
403 }
404
405 obj_node = malloc(sizeof(*obj_node));
406 if (!obj_node) {
407 close(fd);
408 fts_close(fts);
409 fclose(mntfile);
410 return -1;
411 }
412
413 memset(obj_node, 0, sizeof(*obj_node));
414 obj_node->id = pinned_info.id;
415 obj_node->path = strdup(ftse->fts_path);
416 hash_add(tab->table, &obj_node->hash, obj_node->id);
417
418 close(fd);
419 }
420 fts_close(fts);
421 }
422 fclose(mntfile);
423 return 0;
424}
425
426void delete_pinned_obj_table(struct pinned_obj_table *tab)
427{
428 struct pinned_obj *obj;
429 struct hlist_node *tmp;
430 unsigned int bkt;
431
432 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
433 hash_del(&obj->hash);
434 free(obj->path);
435 free(obj);
436 }
437}
438
439unsigned int get_page_size(void)
440{
441 static int result;
442
443 if (!result)
444 result = getpagesize();
445 return result;
446}
447
448unsigned int get_possible_cpus(void)
449{
450 static unsigned int result;
451 char buf[128];
452 long int n;
453 char *ptr;
454 int fd;
455
456 if (result)
457 return result;
458
459 fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
460 if (fd < 0) {
461 p_err("can't open sysfs possible cpus");
462 exit(-1);
463 }
464
465 n = read(fd, buf, sizeof(buf));
466 if (n < 2) {
467 p_err("can't read sysfs possible cpus");
468 exit(-1);
469 }
470 close(fd);
471
472 if (n == sizeof(buf)) {
473 p_err("read sysfs possible cpus overflow");
474 exit(-1);
475 }
476
477 ptr = buf;
478 n = 0;
479 while (*ptr && *ptr != '\n') {
480 unsigned int a, b;
481
482 if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
483 n += b - a + 1;
484
485 ptr = strchr(ptr, '-') + 1;
486 } else if (sscanf(ptr, "%u", &a) == 1) {
487 n++;
488 } else {
489 assert(0);
490 }
491
492 while (isdigit(*ptr))
493 ptr++;
494 if (*ptr == ',')
495 ptr++;
496 }
497
498 result = n;
499
500 return result;
501}
502
503static char *
504ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
505{
506 struct stat st;
507 int err;
508
509 err = stat("/proc/self/ns/net", &st);
510 if (err) {
511 p_err("Can't stat /proc/self: %s", strerror(errno));
512 return NULL;
513 }
514
515 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
516 return NULL;
517
518 return if_indextoname(ifindex, buf);
519}
520
521static int read_sysfs_hex_int(char *path)
522{
523 char vendor_id_buf[8];
524 int len;
525 int fd;
526
527 fd = open(path, O_RDONLY);
528 if (fd < 0) {
529 p_err("Can't open %s: %s", path, strerror(errno));
530 return -1;
531 }
532
533 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
534 close(fd);
535 if (len < 0) {
536 p_err("Can't read %s: %s", path, strerror(errno));
537 return -1;
538 }
539 if (len >= (int)sizeof(vendor_id_buf)) {
540 p_err("Value in %s too long", path);
541 return -1;
542 }
543
544 vendor_id_buf[len] = 0;
545
546 return strtol(vendor_id_buf, NULL, 0);
547}
548
549static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
550{
551 char full_path[64];
552
553 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
554 devname, entry_name);
555
556 return read_sysfs_hex_int(full_path);
557}
558
559const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino)
560{
561 char devname[IF_NAMESIZE];
562 int vendor_id;
563 int device_id;
564
565 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
566 p_err("Can't get net device name for ifindex %d: %s", ifindex,
567 strerror(errno));
568 return NULL;
569 }
570
571 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
572 if (vendor_id < 0) {
573 p_err("Can't get device vendor id for %s", devname);
574 return NULL;
575 }
576
577 switch (vendor_id) {
578 case 0x19ee:
579 device_id = read_sysfs_netdev_hex_int(devname, "device");
580 if (device_id != 0x4000 &&
581 device_id != 0x6000 &&
582 device_id != 0x6003)
583 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
584 return "NFP-6xxx";
585 default:
586 p_err("Can't get bfd arch name for device vendor id 0x%04x",
587 vendor_id);
588 return NULL;
589 }
590}
591
592void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
593{
594 char name[IF_NAMESIZE];
595
596 if (!ifindex)
597 return;
598
599 printf(" dev ");
600 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
601 printf("%s", name);
602 else
603 printf("ifindex %u ns_dev %llu ns_ino %llu",
604 ifindex, ns_dev, ns_inode);
605}
606
607void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
608{
609 char name[IF_NAMESIZE];
610
611 if (!ifindex)
612 return;
613
614 jsonw_name(json_wtr, "dev");
615 jsonw_start_object(json_wtr);
616 jsonw_uint_field(json_wtr, "ifindex", ifindex);
617 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
618 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
619 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
620 jsonw_string_field(json_wtr, "ifname", name);
621 jsonw_end_object(json_wtr);
622}
623
