1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
3
4 #ifndef _GNU_SOURCE
5 #define _GNU_SOURCE
6 #endif
7 #include <ctype.h>
8 #include <errno.h>
9 #include <fcntl.h>
10 #include <ftw.h>
11 #include <libgen.h>
12 #include <mntent.h>
13 #include <stdbool.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <unistd.h>
18 #include <net/if.h>
19 #include <sys/mount.h>
20 #include <sys/resource.h>
21 #include <sys/stat.h>
22 #include <sys/vfs.h>
23
24 #include <linux/filter.h>
25 #include <linux/limits.h>
26 #include <linux/magic.h>
27 #include <linux/unistd.h>
28
29 #include <bpf/bpf.h>
30 #include <bpf/hashmap.h>
31 #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */
32 #include <bpf/btf.h>
33
34 #include "main.h"
35
36 #ifndef BPF_FS_MAGIC
37 #define BPF_FS_MAGIC 0xcafe4a11
38 #endif
39
p_err(const char * fmt,...)40 void p_err(const char *fmt, ...)
41 {
42 va_list ap;
43
44 va_start(ap, fmt);
45 if (json_output) {
46 jsonw_start_object(json_wtr);
47 jsonw_name(json_wtr, "error");
48 jsonw_vprintf_enquote(json_wtr, fmt, ap);
49 jsonw_end_object(json_wtr);
50 } else {
51 fprintf(stderr, "Error: ");
52 vfprintf(stderr, fmt, ap);
53 fprintf(stderr, "\n");
54 }
55 va_end(ap);
56 }
57
p_info(const char * fmt,...)58 void p_info(const char *fmt, ...)
59 {
60 va_list ap;
61
62 if (json_output)
63 return;
64
65 va_start(ap, fmt);
66 vfprintf(stderr, fmt, ap);
67 fprintf(stderr, "\n");
68 va_end(ap);
69 }
70
is_bpffs(char * path)71 static bool is_bpffs(char *path)
72 {
73 struct statfs st_fs;
74
75 if (statfs(path, &st_fs) < 0)
76 return false;
77
78 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
79 }
80
81 /* Probe whether kernel switched from memlock-based (RLIMIT_MEMLOCK) to
82 * memcg-based memory accounting for BPF maps and programs. This was done in
83 * commit 97306be45fbe ("Merge branch 'switch to memcg-based memory
84 * accounting'"), in Linux 5.11.
85 *
86 * Libbpf also offers to probe for memcg-based accounting vs rlimit, but does
87 * so by checking for the availability of a given BPF helper and this has
88 * failed on some kernels with backports in the past, see commit 6b4384ff1088
89 * ("Revert "bpftool: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK"").
90 * Instead, we can probe by lowering the process-based rlimit to 0, trying to
91 * load a BPF object, and resetting the rlimit. If the load succeeds then
92 * memcg-based accounting is supported.
93 *
94 * This would be too dangerous to do in the library, because multithreaded
95 * applications might attempt to load items while the rlimit is at 0. Given
96 * that bpftool is single-threaded, this is fine to do here.
97 */
known_to_need_rlimit(void)98 static bool known_to_need_rlimit(void)
99 {
100 struct rlimit rlim_init, rlim_cur_zero = {};
101 struct bpf_insn insns[] = {
102 BPF_MOV64_IMM(BPF_REG_0, 0),
103 BPF_EXIT_INSN(),
104 };
105 size_t insn_cnt = ARRAY_SIZE(insns);
106 union bpf_attr attr;
107 int prog_fd, err;
108
109 memset(&attr, 0, sizeof(attr));
110 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
111 attr.insns = ptr_to_u64(insns);
112 attr.insn_cnt = insn_cnt;
113 attr.license = ptr_to_u64("GPL");
114
115 if (getrlimit(RLIMIT_MEMLOCK, &rlim_init))
116 return false;
117
118 /* Drop the soft limit to zero. We maintain the hard limit to its
119 * current value, because lowering it would be a permanent operation
120 * for unprivileged users.
121 */
122 rlim_cur_zero.rlim_max = rlim_init.rlim_max;
123 if (setrlimit(RLIMIT_MEMLOCK, &rlim_cur_zero))
124 return false;
125
126 /* Do not use bpf_prog_load() from libbpf here, because it calls
127 * bump_rlimit_memlock(), interfering with the current probe.
128 */
129 prog_fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
130 err = errno;
131
132 /* reset soft rlimit to its initial value */
133 setrlimit(RLIMIT_MEMLOCK, &rlim_init);
134
135 if (prog_fd < 0)
136 return err == EPERM;
137
138 close(prog_fd);
139 return false;
140 }
141
set_max_rlimit(void)142 void set_max_rlimit(void)
143 {
144 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
145
146 if (known_to_need_rlimit())
147 setrlimit(RLIMIT_MEMLOCK, &rinf);
148 }
149
150 static int
mnt_fs(const char * target,const char * type,char * buff,size_t bufflen)151 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
152 {
153 bool bind_done = false;
154
155 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
156 if (errno != EINVAL || bind_done) {
157 snprintf(buff, bufflen,
158 "mount --make-private %s failed: %s",
159 target, strerror(errno));
160 return -1;
161 }
162
163 if (mount(target, target, "none", MS_BIND, NULL)) {
164 snprintf(buff, bufflen,
165 "mount --bind %s %s failed: %s",
166 target, target, strerror(errno));
167 return -1;
168 }
169
170 bind_done = true;
171 }
172
173 if (mount(type, target, type, 0, "mode=0700")) {
174 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s",
175 type, type, target, strerror(errno));
176 return -1;
177 }
178
179 return 0;
180 }
181
mount_tracefs(const char * target)182 int mount_tracefs(const char *target)
183 {
184 char err_str[ERR_MAX_LEN];
185 int err;
186
187 err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
188 if (err) {
189 err_str[ERR_MAX_LEN - 1] = '\0';
190 p_err("can't mount tracefs: %s", err_str);
191 }
192
193 return err;
194 }
195
open_obj_pinned(const char * path,bool quiet)196 int open_obj_pinned(const char *path, bool quiet)
197 {
198 char *pname;
199 int fd = -1;
200
201 pname = strdup(path);
202 if (!pname) {
203 if (!quiet)
204 p_err("mem alloc failed");
205 goto out_ret;
206 }
207
208 fd = bpf_obj_get(pname);
209 if (fd < 0) {
210 if (!quiet)
211 p_err("bpf obj get (%s): %s", pname,
212 errno == EACCES && !is_bpffs(dirname(pname)) ?
213 "directory not in bpf file system (bpffs)" :
214 strerror(errno));
215 goto out_free;
216 }
217
218 out_free:
219 free(pname);
220 out_ret:
221 return fd;
222 }
223
open_obj_pinned_any(const char * path,enum bpf_obj_type exp_type)224 int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type)
225 {
226 enum bpf_obj_type type;
227 int fd;
228
229 fd = open_obj_pinned(path, false);
230 if (fd < 0)
231 return -1;
232
233 type = get_fd_type(fd);
234 if (type < 0) {
235 close(fd);
236 return type;
237 }
238 if (type != exp_type) {
239 p_err("incorrect object type: %s", get_fd_type_name(type));
240 close(fd);
241 return -1;
242 }
243
244 return fd;
245 }
246
mount_bpffs_for_pin(const char * name)247 int mount_bpffs_for_pin(const char *name)
248 {
249 char err_str[ERR_MAX_LEN];
250 char *file;
251 char *dir;
252 int err = 0;
253
254 file = malloc(strlen(name) + 1);
255 if (!file) {
256 p_err("mem alloc failed");
257 return -1;
258 }
259
260 strcpy(file, name);
261 dir = dirname(file);
262
263 if (is_bpffs(dir))
264 /* nothing to do if already mounted */
265 goto out_free;
266
267 if (block_mount) {
268 p_err("no BPF file system found, not mounting it due to --nomount option");
269 err = -1;
270 goto out_free;
271 }
272
273 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
274 if (err) {
275 err_str[ERR_MAX_LEN - 1] = '\0';
276 p_err("can't mount BPF file system to pin the object (%s): %s",
277 name, err_str);
278 }
279
280 out_free:
281 free(file);
282 return err;
283 }
284
do_pin_fd(int fd,const char * name)285 int do_pin_fd(int fd, const char *name)
286 {
287 int err;
288
289 err = mount_bpffs_for_pin(name);
290 if (err)
291 return err;
292
293 err = bpf_obj_pin(fd, name);
294 if (err)
295 p_err("can't pin the object (%s): %s", name, strerror(errno));
296
297 return err;
298 }
299
do_pin_any(int argc,char ** argv,int (* get_fd)(int *,char ***))300 int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***))
301 {
302 int err;
303 int fd;
304
305 if (!REQ_ARGS(3))
306 return -EINVAL;
307
308 fd = get_fd(&argc, &argv);
309 if (fd < 0)
310 return fd;
311
312 err = do_pin_fd(fd, *argv);
313
314 close(fd);
315 return err;
316 }
317
get_fd_type_name(enum bpf_obj_type type)318 const char *get_fd_type_name(enum bpf_obj_type type)
319 {
320 static const char * const names[] = {
321 [BPF_OBJ_UNKNOWN] = "unknown",
322 [BPF_OBJ_PROG] = "prog",
323 [BPF_OBJ_MAP] = "map",
324 [BPF_OBJ_LINK] = "link",
325 };
326
327 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
328 return names[BPF_OBJ_UNKNOWN];
329
330 return names[type];
331 }
332
get_prog_full_name(const struct bpf_prog_info * prog_info,int prog_fd,char * name_buff,size_t buff_len)333 void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd,
334 char *name_buff, size_t buff_len)
335 {
336 const char *prog_name = prog_info->name;
337 const struct btf_type *func_type;
338 const struct bpf_func_info finfo = {};
339 struct bpf_prog_info info = {};
340 __u32 info_len = sizeof(info);
341 struct btf *prog_btf = NULL;
342
343 if (buff_len <= BPF_OBJ_NAME_LEN ||
344 strlen(prog_info->name) < BPF_OBJ_NAME_LEN - 1)
345 goto copy_name;
346
347 if (!prog_info->btf_id || prog_info->nr_func_info == 0)
348 goto copy_name;
349
350 info.nr_func_info = 1;
351 info.func_info_rec_size = prog_info->func_info_rec_size;
352 if (info.func_info_rec_size > sizeof(finfo))
353 info.func_info_rec_size = sizeof(finfo);
354 info.func_info = ptr_to_u64(&finfo);
355
356 if (bpf_prog_get_info_by_fd(prog_fd, &info, &info_len))
357 goto copy_name;
358
359 prog_btf = btf__load_from_kernel_by_id(info.btf_id);
360 if (!prog_btf)
361 goto copy_name;
362
363 func_type = btf__type_by_id(prog_btf, finfo.type_id);
364 if (!func_type || !btf_is_func(func_type))
365 goto copy_name;
366
367 prog_name = btf__name_by_offset(prog_btf, func_type->name_off);
368
369 copy_name:
370 snprintf(name_buff, buff_len, "%s", prog_name);
371
372 if (prog_btf)
373 btf__free(prog_btf);
374 }
375
get_fd_type(int fd)376 int get_fd_type(int fd)
377 {
378 char path[PATH_MAX];
379 char buf[512];
380 ssize_t n;
381
382 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
383
384 n = readlink(path, buf, sizeof(buf));
385 if (n < 0) {
386 p_err("can't read link type: %s", strerror(errno));
387 return -1;
388 }
389 if (n == sizeof(path)) {
390 p_err("can't read link type: path too long!");
391 return -1;
392 }
393
394 if (strstr(buf, "bpf-map"))
395 return BPF_OBJ_MAP;
396 else if (strstr(buf, "bpf-prog"))
397 return BPF_OBJ_PROG;
398 else if (strstr(buf, "bpf-link"))
399 return BPF_OBJ_LINK;
400
401 return BPF_OBJ_UNKNOWN;
402 }
403
get_fdinfo(int fd,const char * key)404 char *get_fdinfo(int fd, const char *key)
405 {
406 char path[PATH_MAX];
407 char *line = NULL;
408 size_t line_n = 0;
409 ssize_t n;
410 FILE *fdi;
411
412 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
413
414 fdi = fopen(path, "r");
415 if (!fdi)
416 return NULL;
417
418 while ((n = getline(&line, &line_n, fdi)) > 0) {
419 char *value;
420 int len;
421
422 if (!strstr(line, key))
423 continue;
424
425 fclose(fdi);
426
427 value = strchr(line, '\t');
428 if (!value || !value[1]) {
429 free(line);
430 return NULL;
431 }
432 value++;
433
434 len = strlen(value);
435 memmove(line, value, len);
436 line[len - 1] = '\0';
437
438 return line;
439 }
440
441 free(line);
442 fclose(fdi);
443 return NULL;
444 }
445
print_data_json(uint8_t * data,size_t len)446 void print_data_json(uint8_t *data, size_t len)
447 {
448 unsigned int i;
449
450 jsonw_start_array(json_wtr);
451 for (i = 0; i < len; i++)
452 jsonw_printf(json_wtr, "%d", data[i]);
453 jsonw_end_array(json_wtr);
454 }
455
print_hex_data_json(uint8_t * data,size_t len)456 void print_hex_data_json(uint8_t *data, size_t len)
457 {
458 unsigned int i;
459
460 jsonw_start_array(json_wtr);
461 for (i = 0; i < len; i++)
462 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
463 jsonw_end_array(json_wtr);
464 }
465
466 /* extra params for nftw cb */
467 static struct hashmap *build_fn_table;
468 static enum bpf_obj_type build_fn_type;
469
do_build_table_cb(const char * fpath,const struct stat * sb,int typeflag,struct FTW * ftwbuf)470 static int do_build_table_cb(const char *fpath, const struct stat *sb,
471 int typeflag, struct FTW *ftwbuf)
472 {
473 struct bpf_prog_info pinned_info;
474 __u32 len = sizeof(pinned_info);
475 enum bpf_obj_type objtype;
476 int fd, err = 0;
477 char *path;
478
479 if (typeflag != FTW_F)
480 goto out_ret;
481
482 fd = open_obj_pinned(fpath, true);
483 if (fd < 0)
484 goto out_ret;
485
486 objtype = get_fd_type(fd);
487 if (objtype != build_fn_type)
488 goto out_close;
489
490 memset(&pinned_info, 0, sizeof(pinned_info));
491 if (bpf_prog_get_info_by_fd(fd, &pinned_info, &len))
492 goto out_close;
493
494 path = strdup(fpath);
495 if (!path) {
496 err = -1;
497 goto out_close;
498 }
499
500 err = hashmap__append(build_fn_table, pinned_info.id, path);
501 if (err) {
502 p_err("failed to append entry to hashmap for ID %u, path '%s': %s",
503 pinned_info.id, path, strerror(errno));
504 free(path);
505 goto out_close;
506 }
507
508 out_close:
509 close(fd);
510 out_ret:
511 return err;
512 }
513
build_pinned_obj_table(struct hashmap * tab,enum bpf_obj_type type)514 int build_pinned_obj_table(struct hashmap *tab,
515 enum bpf_obj_type type)
516 {
517 struct mntent *mntent = NULL;
518 FILE *mntfile = NULL;
519 int flags = FTW_PHYS;
520 int nopenfd = 16;
521 int err = 0;
522
523 mntfile = setmntent("/proc/mounts", "r");
524 if (!mntfile)
525 return -1;
526
527 build_fn_table = tab;
528 build_fn_type = type;
529
530 while ((mntent = getmntent(mntfile))) {
531 char *path = mntent->mnt_dir;
532
533 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
534 continue;
535 err = nftw(path, do_build_table_cb, nopenfd, flags);
536 if (err)
537 break;
538 }
539 fclose(mntfile);
540 return err;
541 }
542
delete_pinned_obj_table(struct hashmap * map)543 void delete_pinned_obj_table(struct hashmap *map)
544 {
545 struct hashmap_entry *entry;
546 size_t bkt;
547
548 if (!map)
549 return;
550
551 hashmap__for_each_entry(map, entry, bkt)
552 free(entry->pvalue);
553
554 hashmap__free(map);
555 }
556
get_page_size(void)557 unsigned int get_page_size(void)
558 {
559 static int result;
560
561 if (!result)
562 result = getpagesize();
563 return result;
564 }
565
get_possible_cpus(void)566 unsigned int get_possible_cpus(void)
567 {
568 int cpus = libbpf_num_possible_cpus();
569
570 if (cpus < 0) {
571 p_err("Can't get # of possible cpus: %s", strerror(-cpus));
572 exit(-1);
573 }
574 return cpus;
575 }
576
577 static char *
ifindex_to_name_ns(__u32 ifindex,__u32 ns_dev,__u32 ns_ino,char * buf)578 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
579 {
580 struct stat st;
581 int err;
582
583 err = stat("/proc/self/ns/net", &st);
584 if (err) {
585 p_err("Can't stat /proc/self: %s", strerror(errno));
586 return NULL;
587 }
588
589 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
590 return NULL;
591
592 return if_indextoname(ifindex, buf);
593 }
594
read_sysfs_hex_int(char * path)595 static int read_sysfs_hex_int(char *path)
596 {
597 char vendor_id_buf[8];
598 int len;
599 int fd;
600
601 fd = open(path, O_RDONLY);
602 if (fd < 0) {
603 p_err("Can't open %s: %s", path, strerror(errno));
604 return -1;
605 }
606
607 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
608 close(fd);
609 if (len < 0) {
610 p_err("Can't read %s: %s", path, strerror(errno));
611 return -1;
612 }
613 if (len >= (int)sizeof(vendor_id_buf)) {
614 p_err("Value in %s too long", path);
615 return -1;
616 }
617
618 vendor_id_buf[len] = 0;
619
620 return strtol(vendor_id_buf, NULL, 0);
621 }
622
read_sysfs_netdev_hex_int(char * devname,const char * entry_name)623 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
624 {
625 char full_path[64];
626
627 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
628 devname, entry_name);
629
630 return read_sysfs_hex_int(full_path);
631 }
632
633 const char *
ifindex_to_arch(__u32 ifindex,__u64 ns_dev,__u64 ns_ino,const char ** opt)634 ifindex_to_arch(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, const char **opt)
635 {
636 __maybe_unused int device_id;
637 char devname[IF_NAMESIZE];
638 int vendor_id;
639
640 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
641 p_err("Can't get net device name for ifindex %d: %s", ifindex,
642 strerror(errno));
643 return NULL;
644 }
645
646 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
647 if (vendor_id < 0) {
648 p_err("Can't get device vendor id for %s", devname);
649 return NULL;
650 }
651
652 switch (vendor_id) {
653 #ifdef HAVE_LIBBFD_SUPPORT
654 case 0x19ee:
655 device_id = read_sysfs_netdev_hex_int(devname, "device");
656 if (device_id != 0x4000 &&
657 device_id != 0x6000 &&
658 device_id != 0x6003)
659 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
660 *opt = "ctx4";
661 return "NFP-6xxx";
662 #endif /* HAVE_LIBBFD_SUPPORT */
663 /* No NFP support in LLVM, we have no valid triple to return. */
664 default:
665 p_err("Can't get arch name for device vendor id 0x%04x",
666 vendor_id);
667 return NULL;
668 }
669 }
670
print_dev_plain(__u32 ifindex,__u64 ns_dev,__u64 ns_inode)671 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
672 {
673 char name[IF_NAMESIZE];
674
675 if (!ifindex)
676 return;
677
678 printf(" offloaded_to ");
679 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
680 printf("%s", name);
681 else
682 printf("ifindex %u ns_dev %llu ns_ino %llu",
683 ifindex, ns_dev, ns_inode);
684 }
685
print_dev_json(__u32 ifindex,__u64 ns_dev,__u64 ns_inode)686 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
687 {
688 char name[IF_NAMESIZE];
689
690 if (!ifindex)
691 return;
692
693 jsonw_name(json_wtr, "dev");
694 jsonw_start_object(json_wtr);
695 jsonw_uint_field(json_wtr, "ifindex", ifindex);
696 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
697 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
698 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
699 jsonw_string_field(json_wtr, "ifname", name);
700 jsonw_end_object(json_wtr);
701 }
702
parse_u32_arg(int * argc,char *** argv,__u32 * val,const char * what)703 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
704 {
705 char *endptr;
706
707 NEXT_ARGP();
708
709 if (*val) {
710 p_err("%s already specified", what);
711 return -1;
712 }
713
714 *val = strtoul(**argv, &endptr, 0);
715 if (*endptr) {
716 p_err("can't parse %s as %s", **argv, what);
717 return -1;
718 }
719 NEXT_ARGP();
720
721 return 0;
722 }
723
724 int __printf(2, 0)
print_all_levels(__maybe_unused enum libbpf_print_level level,const char * format,va_list args)725 print_all_levels(__maybe_unused enum libbpf_print_level level,
726 const char *format, va_list args)
727 {
728 return vfprintf(stderr, format, args);
729 }
730
prog_fd_by_nametag(void * nametag,int ** fds,bool tag)731 static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
732 {
733 char prog_name[MAX_PROG_FULL_NAME];
734 unsigned int id = 0;
735 int fd, nb_fds = 0;
736 void *tmp;
737 int err;
738
739 while (true) {
740 struct bpf_prog_info info = {};
741 __u32 len = sizeof(info);
742
743 err = bpf_prog_get_next_id(id, &id);
744 if (err) {
745 if (errno != ENOENT) {
746 p_err("%s", strerror(errno));
747 goto err_close_fds;
748 }
749 return nb_fds;
750 }
751
752 fd = bpf_prog_get_fd_by_id(id);
753 if (fd < 0) {
754 p_err("can't get prog by id (%u): %s",
755 id, strerror(errno));
756 goto err_close_fds;
757 }
758
759 err = bpf_prog_get_info_by_fd(fd, &info, &len);
760 if (err) {
761 p_err("can't get prog info (%u): %s",
762 id, strerror(errno));
763 goto err_close_fd;
764 }
765
766 if (tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) {
767 close(fd);
768 continue;
769 }
770
771 if (!tag) {
772 get_prog_full_name(&info, fd, prog_name,
773 sizeof(prog_name));
774 if (strncmp(nametag, prog_name, sizeof(prog_name))) {
775 close(fd);
776 continue;
777 }
778 }
779
780 if (nb_fds > 0) {
781 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
782 if (!tmp) {
783 p_err("failed to realloc");
784 goto err_close_fd;
785 }
786 *fds = tmp;
787 }
788 (*fds)[nb_fds++] = fd;
789 }
790
791 err_close_fd:
792 close(fd);
793 err_close_fds:
794 while (--nb_fds >= 0)
795 close((*fds)[nb_fds]);
796 return -1;
797 }
798
prog_parse_fds(int * argc,char *** argv,int ** fds)799 int prog_parse_fds(int *argc, char ***argv, int **fds)
800 {
801 if (is_prefix(**argv, "id")) {
802 unsigned int id;
803 char *endptr;
804
805 NEXT_ARGP();
806
807 id = strtoul(**argv, &endptr, 0);
808 if (*endptr) {
809 p_err("can't parse %s as ID", **argv);
810 return -1;
811 }
812 NEXT_ARGP();
813
814 (*fds)[0] = bpf_prog_get_fd_by_id(id);
815 if ((*fds)[0] < 0) {
816 p_err("get by id (%u): %s", id, strerror(errno));
817 return -1;
818 }
819 return 1;
820 } else if (is_prefix(**argv, "tag")) {
821 unsigned char tag[BPF_TAG_SIZE];
822
823 NEXT_ARGP();
824
825 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
826 tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
827 != BPF_TAG_SIZE) {
828 p_err("can't parse tag");
829 return -1;
830 }
831 NEXT_ARGP();
832
833 return prog_fd_by_nametag(tag, fds, true);
834 } else if (is_prefix(**argv, "name")) {
835 char *name;
836
837 NEXT_ARGP();
838
839 name = **argv;
840 if (strlen(name) > MAX_PROG_FULL_NAME - 1) {
841 p_err("can't parse name");
842 return -1;
843 }
844 NEXT_ARGP();
845
846 return prog_fd_by_nametag(name, fds, false);
847 } else if (is_prefix(**argv, "pinned")) {
848 char *path;
849
850 NEXT_ARGP();
851
852 path = **argv;
853 NEXT_ARGP();
854
855 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG);
856 if ((*fds)[0] < 0)
857 return -1;
858 return 1;
859 }
860
861 p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv);
862 return -1;
863 }
864
prog_parse_fd(int * argc,char *** argv)865 int prog_parse_fd(int *argc, char ***argv)
866 {
867 int *fds = NULL;
868 int nb_fds, fd;
869
870 fds = malloc(sizeof(int));
871 if (!fds) {
872 p_err("mem alloc failed");
873 return -1;
874 }
875 nb_fds = prog_parse_fds(argc, argv, &fds);
876 if (nb_fds != 1) {
877 if (nb_fds > 1) {
878 p_err("several programs match this handle");
879 while (nb_fds--)
880 close(fds[nb_fds]);
881 }
882 fd = -1;
883 goto exit_free;
884 }
885
886 fd = fds[0];
887 exit_free:
888 free(fds);
889 return fd;
890 }
891
map_fd_by_name(char * name,int ** fds)892 static int map_fd_by_name(char *name, int **fds)
893 {
894 unsigned int id = 0;
895 int fd, nb_fds = 0;
896 void *tmp;
897 int err;
898
899 while (true) {
900 struct bpf_map_info info = {};
901 __u32 len = sizeof(info);
902
903 err = bpf_map_get_next_id(id, &id);
904 if (err) {
905 if (errno != ENOENT) {
906 p_err("%s", strerror(errno));
907 goto err_close_fds;
908 }
909 return nb_fds;
910 }
911
912 fd = bpf_map_get_fd_by_id(id);
913 if (fd < 0) {
914 p_err("can't get map by id (%u): %s",
915 id, strerror(errno));
916 goto err_close_fds;
917 }
918
919 err = bpf_map_get_info_by_fd(fd, &info, &len);
920 if (err) {
921 p_err("can't get map info (%u): %s",
922 id, strerror(errno));
923 goto err_close_fd;
924 }
925
926 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) {
927 close(fd);
928 continue;
929 }
930
931 if (nb_fds > 0) {
932 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
933 if (!tmp) {
934 p_err("failed to realloc");
935 goto err_close_fd;
936 }
937 *fds = tmp;
938 }
939 (*fds)[nb_fds++] = fd;
940 }
941
942 err_close_fd:
943 close(fd);
944 err_close_fds:
945 while (--nb_fds >= 0)
946 close((*fds)[nb_fds]);
947 return -1;
948 }
949
map_parse_fds(int * argc,char *** argv,int ** fds)950 int map_parse_fds(int *argc, char ***argv, int **fds)
951 {
952 if (is_prefix(**argv, "id")) {
953 unsigned int id;
954 char *endptr;
955
956 NEXT_ARGP();
957
958 id = strtoul(**argv, &endptr, 0);
959 if (*endptr) {
960 p_err("can't parse %s as ID", **argv);
961 return -1;
962 }
963 NEXT_ARGP();
964
965 (*fds)[0] = bpf_map_get_fd_by_id(id);
966 if ((*fds)[0] < 0) {
967 p_err("get map by id (%u): %s", id, strerror(errno));
968 return -1;
969 }
970 return 1;
971 } else if (is_prefix(**argv, "name")) {
972 char *name;
973
974 NEXT_ARGP();
975
976 name = **argv;
977 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
978 p_err("can't parse name");
979 return -1;
980 }
981 NEXT_ARGP();
982
983 return map_fd_by_name(name, fds);
984 } else if (is_prefix(**argv, "pinned")) {
985 char *path;
986
987 NEXT_ARGP();
988
989 path = **argv;
990 NEXT_ARGP();
991
992 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP);
993 if ((*fds)[0] < 0)
994 return -1;
995 return 1;
996 }
997
998 p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv);
999 return -1;
1000 }
1001
map_parse_fd(int * argc,char *** argv)1002 int map_parse_fd(int *argc, char ***argv)
1003 {
1004 int *fds = NULL;
1005 int nb_fds, fd;
1006
1007 fds = malloc(sizeof(int));
1008 if (!fds) {
1009 p_err("mem alloc failed");
1010 return -1;
1011 }
1012 nb_fds = map_parse_fds(argc, argv, &fds);
1013 if (nb_fds != 1) {
1014 if (nb_fds > 1) {
1015 p_err("several maps match this handle");
1016 while (nb_fds--)
1017 close(fds[nb_fds]);
1018 }
1019 fd = -1;
1020 goto exit_free;
1021 }
1022
1023 fd = fds[0];
1024 exit_free:
1025 free(fds);
1026 return fd;
1027 }
1028
map_parse_fd_and_info(int * argc,char *** argv,struct bpf_map_info * info,__u32 * info_len)1029 int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info,
1030 __u32 *info_len)
1031 {
1032 int err;
1033 int fd;
1034
1035 fd = map_parse_fd(argc, argv);
1036 if (fd < 0)
1037 return -1;
1038
1039 err = bpf_map_get_info_by_fd(fd, info, info_len);
1040 if (err) {
1041 p_err("can't get map info: %s", strerror(errno));
1042 close(fd);
1043 return err;
1044 }
1045
1046 return fd;
1047 }
1048
hash_fn_for_key_as_id(long key,void * ctx)1049 size_t hash_fn_for_key_as_id(long key, void *ctx)
1050 {
1051 return key;
1052 }
1053
equal_fn_for_key_as_id(long k1,long k2,void * ctx)1054 bool equal_fn_for_key_as_id(long k1, long k2, void *ctx)
1055 {
1056 return k1 == k2;
1057 }
1058
bpf_attach_type_input_str(enum bpf_attach_type t)1059 const char *bpf_attach_type_input_str(enum bpf_attach_type t)
1060 {
1061 switch (t) {
1062 case BPF_CGROUP_INET_INGRESS: return "ingress";
1063 case BPF_CGROUP_INET_EGRESS: return "egress";
1064 case BPF_CGROUP_INET_SOCK_CREATE: return "sock_create";
1065 case BPF_CGROUP_INET_SOCK_RELEASE: return "sock_release";
1066 case BPF_CGROUP_SOCK_OPS: return "sock_ops";
1067 case BPF_CGROUP_DEVICE: return "device";
1068 case BPF_CGROUP_INET4_BIND: return "bind4";
1069 case BPF_CGROUP_INET6_BIND: return "bind6";
1070 case BPF_CGROUP_INET4_CONNECT: return "connect4";
1071 case BPF_CGROUP_INET6_CONNECT: return "connect6";
1072 case BPF_CGROUP_INET4_POST_BIND: return "post_bind4";
1073 case BPF_CGROUP_INET6_POST_BIND: return "post_bind6";
1074 case BPF_CGROUP_INET4_GETPEERNAME: return "getpeername4";
1075 case BPF_CGROUP_INET6_GETPEERNAME: return "getpeername6";
1076 case BPF_CGROUP_INET4_GETSOCKNAME: return "getsockname4";
1077 case BPF_CGROUP_INET6_GETSOCKNAME: return "getsockname6";
1078 case BPF_CGROUP_UDP4_SENDMSG: return "sendmsg4";
1079 case BPF_CGROUP_UDP6_SENDMSG: return "sendmsg6";
1080 case BPF_CGROUP_SYSCTL: return "sysctl";
1081 case BPF_CGROUP_UDP4_RECVMSG: return "recvmsg4";
1082 case BPF_CGROUP_UDP6_RECVMSG: return "recvmsg6";
1083 case BPF_CGROUP_GETSOCKOPT: return "getsockopt";
1084 case BPF_CGROUP_SETSOCKOPT: return "setsockopt";
1085 case BPF_TRACE_RAW_TP: return "raw_tp";
1086 case BPF_TRACE_FENTRY: return "fentry";
1087 case BPF_TRACE_FEXIT: return "fexit";
1088 case BPF_MODIFY_RETURN: return "mod_ret";
1089 case BPF_SK_REUSEPORT_SELECT: return "sk_skb_reuseport_select";
1090 case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE: return "sk_skb_reuseport_select_or_migrate";
1091 default: return libbpf_bpf_attach_type_str(t);
1092 }
1093 }
1094