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1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
3
4#define _GNU_SOURCE
5#include <ctype.h>
6#include <errno.h>
7#include <fcntl.h>
8#include <ftw.h>
9#include <libgen.h>
10#include <mntent.h>
11#include <stdbool.h>
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15#include <unistd.h>
16#include <linux/limits.h>
17#include <linux/magic.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 <bpf/bpf.h>
25#include <bpf/libbpf.h> /* libbpf_num_possible_cpus */
26
27#include "main.h"
28
29#ifndef BPF_FS_MAGIC
30#define BPF_FS_MAGIC 0xcafe4a11
31#endif
32
33const char * const attach_type_name[__MAX_BPF_ATTACH_TYPE] = {
34 [BPF_CGROUP_INET_INGRESS] = "ingress",
35 [BPF_CGROUP_INET_EGRESS] = "egress",
36 [BPF_CGROUP_INET_SOCK_CREATE] = "sock_create",
37 [BPF_CGROUP_INET_SOCK_RELEASE] = "sock_release",
38 [BPF_CGROUP_SOCK_OPS] = "sock_ops",
39 [BPF_CGROUP_DEVICE] = "device",
40 [BPF_CGROUP_INET4_BIND] = "bind4",
41 [BPF_CGROUP_INET6_BIND] = "bind6",
42 [BPF_CGROUP_INET4_CONNECT] = "connect4",
43 [BPF_CGROUP_INET6_CONNECT] = "connect6",
44 [BPF_CGROUP_INET4_POST_BIND] = "post_bind4",
45 [BPF_CGROUP_INET6_POST_BIND] = "post_bind6",
46 [BPF_CGROUP_INET4_GETPEERNAME] = "getpeername4",
47 [BPF_CGROUP_INET6_GETPEERNAME] = "getpeername6",
48 [BPF_CGROUP_INET4_GETSOCKNAME] = "getsockname4",
49 [BPF_CGROUP_INET6_GETSOCKNAME] = "getsockname6",
50 [BPF_CGROUP_UDP4_SENDMSG] = "sendmsg4",
51 [BPF_CGROUP_UDP6_SENDMSG] = "sendmsg6",
52 [BPF_CGROUP_SYSCTL] = "sysctl",
53 [BPF_CGROUP_UDP4_RECVMSG] = "recvmsg4",
54 [BPF_CGROUP_UDP6_RECVMSG] = "recvmsg6",
55 [BPF_CGROUP_GETSOCKOPT] = "getsockopt",
56 [BPF_CGROUP_SETSOCKOPT] = "setsockopt",
57
58 [BPF_SK_SKB_STREAM_PARSER] = "sk_skb_stream_parser",
59 [BPF_SK_SKB_STREAM_VERDICT] = "sk_skb_stream_verdict",
60 [BPF_SK_SKB_VERDICT] = "sk_skb_verdict",
61 [BPF_SK_MSG_VERDICT] = "sk_msg_verdict",
62 [BPF_LIRC_MODE2] = "lirc_mode2",
63 [BPF_FLOW_DISSECTOR] = "flow_dissector",
64 [BPF_TRACE_RAW_TP] = "raw_tp",
65 [BPF_TRACE_FENTRY] = "fentry",
66 [BPF_TRACE_FEXIT] = "fexit",
67 [BPF_MODIFY_RETURN] = "mod_ret",
68 [BPF_LSM_MAC] = "lsm_mac",
69 [BPF_SK_LOOKUP] = "sk_lookup",
70};
71
72void p_err(const char *fmt, ...)
73{
74 va_list ap;
75
76 va_start(ap, fmt);
77 if (json_output) {
78 jsonw_start_object(json_wtr);
79 jsonw_name(json_wtr, "error");
80 jsonw_vprintf_enquote(json_wtr, fmt, ap);
81 jsonw_end_object(json_wtr);
82 } else {
83 fprintf(stderr, "Error: ");
84 vfprintf(stderr, fmt, ap);
85 fprintf(stderr, "\n");
86 }
87 va_end(ap);
88}
89
90void p_info(const char *fmt, ...)
91{
92 va_list ap;
93
94 if (json_output)
95 return;
96
97 va_start(ap, fmt);
98 vfprintf(stderr, fmt, ap);
99 fprintf(stderr, "\n");
100 va_end(ap);
101}
102
103static bool is_bpffs(char *path)
104{
105 struct statfs st_fs;
106
107 if (statfs(path, &st_fs) < 0)
108 return false;
109
110 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
111}
112
113void set_max_rlimit(void)
114{
115 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
116
117 setrlimit(RLIMIT_MEMLOCK, &rinf);
118}
119
120static int
121mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
122{
123 bool bind_done = false;
124
125 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
126 if (errno != EINVAL || bind_done) {
127 snprintf(buff, bufflen,
128 "mount --make-private %s failed: %s",
129 target, strerror(errno));
130 return -1;
131 }
132
133 if (mount(target, target, "none", MS_BIND, NULL)) {
134 snprintf(buff, bufflen,
135 "mount --bind %s %s failed: %s",
136 target, target, strerror(errno));
137 return -1;
138 }
139
140 bind_done = true;
141 }
142
143 if (mount(type, target, type, 0, "mode=0700")) {
144 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s",
145 type, type, target, strerror(errno));
146 return -1;
147 }
148
149 return 0;
150}
151
152int mount_tracefs(const char *target)
153{
154 char err_str[ERR_MAX_LEN];
155 int err;
156
157 err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
158 if (err) {
159 err_str[ERR_MAX_LEN - 1] = '\0';
160 p_err("can't mount tracefs: %s", err_str);
161 }
162
163 return err;
164}
165
166int open_obj_pinned(const char *path, bool quiet)
167{
168 char *pname;
169 int fd = -1;
170
171 pname = strdup(path);
172 if (!pname) {
173 if (!quiet)
174 p_err("mem alloc failed");
175 goto out_ret;
176 }
177
178 fd = bpf_obj_get(pname);
179 if (fd < 0) {
180 if (!quiet)
181 p_err("bpf obj get (%s): %s", pname,
182 errno == EACCES && !is_bpffs(dirname(pname)) ?
183 "directory not in bpf file system (bpffs)" :
184 strerror(errno));
185 goto out_free;
186 }
187
188out_free:
189 free(pname);
190out_ret:
191 return fd;
192}
193
194int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type)
195{
196 enum bpf_obj_type type;
197 int fd;
198
199 fd = open_obj_pinned(path, false);
200 if (fd < 0)
201 return -1;
202
203 type = get_fd_type(fd);
204 if (type < 0) {
205 close(fd);
206 return type;
207 }
208 if (type != exp_type) {
209 p_err("incorrect object type: %s", get_fd_type_name(type));
210 close(fd);
211 return -1;
212 }
213
214 return fd;
215}
216
217int mount_bpffs_for_pin(const char *name)
218{
219 char err_str[ERR_MAX_LEN];
220 char *file;
221 char *dir;
222 int err = 0;
223
224 file = malloc(strlen(name) + 1);
225 if (!file) {
226 p_err("mem alloc failed");
227 return -1;
228 }
229
230 strcpy(file, name);
231 dir = dirname(file);
232
233 if (is_bpffs(dir))
234 /* nothing to do if already mounted */
235 goto out_free;
236
237 if (block_mount) {
238 p_err("no BPF file system found, not mounting it due to --nomount option");
239 err = -1;
240 goto out_free;
241 }
242
243 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
244 if (err) {
245 err_str[ERR_MAX_LEN - 1] = '\0';
246 p_err("can't mount BPF file system to pin the object (%s): %s",
247 name, err_str);
248 }
249
250out_free:
251 free(file);
252 return err;
253}
254
255int do_pin_fd(int fd, const char *name)
256{
257 int err;
258
259 err = mount_bpffs_for_pin(name);
260 if (err)
261 return err;
262
263 err = bpf_obj_pin(fd, name);
264 if (err)
265 p_err("can't pin the object (%s): %s", name, strerror(errno));
266
267 return err;
268}
269
270int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***))
271{
272 int err;
273 int fd;
274
275 fd = get_fd(&argc, &argv);
276 if (fd < 0)
277 return fd;
278
279 err = do_pin_fd(fd, *argv);
280
281 close(fd);
282 return err;
283}
284
285const char *get_fd_type_name(enum bpf_obj_type type)
286{
287 static const char * const names[] = {
288 [BPF_OBJ_UNKNOWN] = "unknown",
289 [BPF_OBJ_PROG] = "prog",
290 [BPF_OBJ_MAP] = "map",
291 };
292
293 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
294 return names[BPF_OBJ_UNKNOWN];
295
296 return names[type];
297}
298
299int get_fd_type(int fd)
300{
301 char path[PATH_MAX];
302 char buf[512];
303 ssize_t n;
304
305 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
306
307 n = readlink(path, buf, sizeof(buf));
308 if (n < 0) {
309 p_err("can't read link type: %s", strerror(errno));
310 return -1;
311 }
312 if (n == sizeof(path)) {
313 p_err("can't read link type: path too long!");
314 return -1;
315 }
316
317 if (strstr(buf, "bpf-map"))
318 return BPF_OBJ_MAP;
319 else if (strstr(buf, "bpf-prog"))
320 return BPF_OBJ_PROG;
321 else if (strstr(buf, "bpf-link"))
322 return BPF_OBJ_LINK;
323
324 return BPF_OBJ_UNKNOWN;
325}
326
327char *get_fdinfo(int fd, const char *key)
328{
329 char path[PATH_MAX];
330 char *line = NULL;
331 size_t line_n = 0;
332 ssize_t n;
333 FILE *fdi;
334
335 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
336
337 fdi = fopen(path, "r");
338 if (!fdi)
339 return NULL;
340
341 while ((n = getline(&line, &line_n, fdi)) > 0) {
342 char *value;
343 int len;
344
345 if (!strstr(line, key))
346 continue;
347
348 fclose(fdi);
349
350 value = strchr(line, '\t');
351 if (!value || !value[1]) {
352 free(line);
353 return NULL;
354 }
355 value++;
356
357 len = strlen(value);
358 memmove(line, value, len);
359 line[len - 1] = '\0';
360
361 return line;
362 }
363
364 free(line);
365 fclose(fdi);
366 return NULL;
367}
368
369void print_data_json(uint8_t *data, size_t len)
370{
371 unsigned int i;
372
373 jsonw_start_array(json_wtr);
374 for (i = 0; i < len; i++)
375 jsonw_printf(json_wtr, "%d", data[i]);
376 jsonw_end_array(json_wtr);
377}
378
379void print_hex_data_json(uint8_t *data, size_t len)
380{
381 unsigned int i;
382
383 jsonw_start_array(json_wtr);
384 for (i = 0; i < len; i++)
385 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
386 jsonw_end_array(json_wtr);
387}
388
389/* extra params for nftw cb */
390static struct pinned_obj_table *build_fn_table;
391static enum bpf_obj_type build_fn_type;
392
393static int do_build_table_cb(const char *fpath, const struct stat *sb,
394 int typeflag, struct FTW *ftwbuf)
395{
396 struct bpf_prog_info pinned_info;
397 __u32 len = sizeof(pinned_info);
398 struct pinned_obj *obj_node;
399 enum bpf_obj_type objtype;
400 int fd, err = 0;
401
402 if (typeflag != FTW_F)
403 goto out_ret;
404
405 fd = open_obj_pinned(fpath, true);
406 if (fd < 0)
407 goto out_ret;
408
409 objtype = get_fd_type(fd);
410 if (objtype != build_fn_type)
411 goto out_close;
412
413 memset(&pinned_info, 0, sizeof(pinned_info));
414 if (bpf_obj_get_info_by_fd(fd, &pinned_info, &len))
415 goto out_close;
416
417 obj_node = calloc(1, sizeof(*obj_node));
418 if (!obj_node) {
419 err = -1;
420 goto out_close;
421 }
422
423 obj_node->id = pinned_info.id;
424 obj_node->path = strdup(fpath);
425 if (!obj_node->path) {
426 err = -1;
427 free(obj_node);
428 goto out_close;
429 }
430
431 hash_add(build_fn_table->table, &obj_node->hash, obj_node->id);
432out_close:
433 close(fd);
434out_ret:
435 return err;
436}
437
438int build_pinned_obj_table(struct pinned_obj_table *tab,
439 enum bpf_obj_type type)
440{
441 struct mntent *mntent = NULL;
442 FILE *mntfile = NULL;
443 int flags = FTW_PHYS;
444 int nopenfd = 16;
445 int err = 0;
446
447 mntfile = setmntent("/proc/mounts", "r");
448 if (!mntfile)
449 return -1;
450
451 build_fn_table = tab;
452 build_fn_type = type;
453
454 while ((mntent = getmntent(mntfile))) {
455 char *path = mntent->mnt_dir;
456
457 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
458 continue;
459 err = nftw(path, do_build_table_cb, nopenfd, flags);
460 if (err)
461 break;
462 }
463 fclose(mntfile);
464 return err;
465}
466
467void delete_pinned_obj_table(struct pinned_obj_table *tab)
468{
469 struct pinned_obj *obj;
470 struct hlist_node *tmp;
471 unsigned int bkt;
472
473 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
474 hash_del(&obj->hash);
475 free(obj->path);
476 free(obj);
477 }
478}
479
480unsigned int get_page_size(void)
481{
482 static int result;
483
484 if (!result)
485 result = getpagesize();
486 return result;
487}
488
489unsigned int get_possible_cpus(void)
490{
491 int cpus = libbpf_num_possible_cpus();
492
493 if (cpus < 0) {
494 p_err("Can't get # of possible cpus: %s", strerror(-cpus));
495 exit(-1);
496 }
497 return cpus;
498}
499
500static char *
501ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
502{
503 struct stat st;
504 int err;
505
506 err = stat("/proc/self/ns/net", &st);
507 if (err) {
508 p_err("Can't stat /proc/self: %s", strerror(errno));
509 return NULL;
510 }
511
512 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
513 return NULL;
514
515 return if_indextoname(ifindex, buf);
516}
517
518static int read_sysfs_hex_int(char *path)
519{
520 char vendor_id_buf[8];
521 int len;
522 int fd;
523
524 fd = open(path, O_RDONLY);
525 if (fd < 0) {
526 p_err("Can't open %s: %s", path, strerror(errno));
527 return -1;
528 }
529
530 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
531 close(fd);
532 if (len < 0) {
533 p_err("Can't read %s: %s", path, strerror(errno));
534 return -1;
535 }
536 if (len >= (int)sizeof(vendor_id_buf)) {
537 p_err("Value in %s too long", path);
538 return -1;
539 }
540
541 vendor_id_buf[len] = 0;
542
543 return strtol(vendor_id_buf, NULL, 0);
544}
545
546static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
547{
548 char full_path[64];
549
550 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
551 devname, entry_name);
552
553 return read_sysfs_hex_int(full_path);
554}
555
556const char *
557ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
558 const char **opt)
559{
560 char devname[IF_NAMESIZE];
561 int vendor_id;
562 int device_id;
563
564 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
565 p_err("Can't get net device name for ifindex %d: %s", ifindex,
566 strerror(errno));
567 return NULL;
568 }
569
570 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
571 if (vendor_id < 0) {
572 p_err("Can't get device vendor id for %s", devname);
573 return NULL;
574 }
575
576 switch (vendor_id) {
577 case 0x19ee:
578 device_id = read_sysfs_netdev_hex_int(devname, "device");
579 if (device_id != 0x4000 &&
580 device_id != 0x6000 &&
581 device_id != 0x6003)
582 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
583 *opt = "ctx4";
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(" offloaded_to ");
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
624int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
625{
626 char *endptr;
627
628 NEXT_ARGP();
629
630 if (*val) {
631 p_err("%s already specified", what);
632 return -1;
633 }
634
635 *val = strtoul(**argv, &endptr, 0);
636 if (*endptr) {
637 p_err("can't parse %s as %s", **argv, what);
638 return -1;
639 }
640 NEXT_ARGP();
641
642 return 0;
643}
644
645int __printf(2, 0)
646print_all_levels(__maybe_unused enum libbpf_print_level level,
647 const char *format, va_list args)
648{
649 return vfprintf(stderr, format, args);
650}
651
652static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
653{
654 unsigned int id = 0;
655 int fd, nb_fds = 0;
656 void *tmp;
657 int err;
658
659 while (true) {
660 struct bpf_prog_info info = {};
661 __u32 len = sizeof(info);
662
663 err = bpf_prog_get_next_id(id, &id);
664 if (err) {
665 if (errno != ENOENT) {
666 p_err("%s", strerror(errno));
667 goto err_close_fds;
668 }
669 return nb_fds;
670 }
671
672 fd = bpf_prog_get_fd_by_id(id);
673 if (fd < 0) {
674 p_err("can't get prog by id (%u): %s",
675 id, strerror(errno));
676 goto err_close_fds;
677 }
678
679 err = bpf_obj_get_info_by_fd(fd, &info, &len);
680 if (err) {
681 p_err("can't get prog info (%u): %s",
682 id, strerror(errno));
683 goto err_close_fd;
684 }
685
686 if ((tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) ||
687 (!tag && strncmp(nametag, info.name, BPF_OBJ_NAME_LEN))) {
688 close(fd);
689 continue;
690 }
691
692 if (nb_fds > 0) {
693 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
694 if (!tmp) {
695 p_err("failed to realloc");
696 goto err_close_fd;
697 }
698 *fds = tmp;
699 }
700 (*fds)[nb_fds++] = fd;
701 }
702
703err_close_fd:
704 close(fd);
705err_close_fds:
706 while (--nb_fds >= 0)
707 close((*fds)[nb_fds]);
708 return -1;
709}
710
711int prog_parse_fds(int *argc, char ***argv, int **fds)
712{
713 if (is_prefix(**argv, "id")) {
714 unsigned int id;
715 char *endptr;
716
717 NEXT_ARGP();
718
719 id = strtoul(**argv, &endptr, 0);
720 if (*endptr) {
721 p_err("can't parse %s as ID", **argv);
722 return -1;
723 }
724 NEXT_ARGP();
725
726 (*fds)[0] = bpf_prog_get_fd_by_id(id);
727 if ((*fds)[0] < 0) {
728 p_err("get by id (%u): %s", id, strerror(errno));
729 return -1;
730 }
731 return 1;
732 } else if (is_prefix(**argv, "tag")) {
733 unsigned char tag[BPF_TAG_SIZE];
734
735 NEXT_ARGP();
736
737 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
738 tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
739 != BPF_TAG_SIZE) {
740 p_err("can't parse tag");
741 return -1;
742 }
743 NEXT_ARGP();
744
745 return prog_fd_by_nametag(tag, fds, true);
746 } else if (is_prefix(**argv, "name")) {
747 char *name;
748
749 NEXT_ARGP();
750
751 name = **argv;
752 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
753 p_err("can't parse name");
754 return -1;
755 }
756 NEXT_ARGP();
757
758 return prog_fd_by_nametag(name, fds, false);
759 } else if (is_prefix(**argv, "pinned")) {
760 char *path;
761
762 NEXT_ARGP();
763
764 path = **argv;
765 NEXT_ARGP();
766
767 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG);
768 if ((*fds)[0] < 0)
769 return -1;
770 return 1;
771 }
772
773 p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv);
774 return -1;
775}
776
777int prog_parse_fd(int *argc, char ***argv)
778{
779 int *fds = NULL;
780 int nb_fds, fd;
781
782 fds = malloc(sizeof(int));
783 if (!fds) {
784 p_err("mem alloc failed");
785 return -1;
786 }
787 nb_fds = prog_parse_fds(argc, argv, &fds);
788 if (nb_fds != 1) {
789 if (nb_fds > 1) {
790 p_err("several programs match this handle");
791 while (nb_fds--)
792 close(fds[nb_fds]);
793 }
794 fd = -1;
795 goto exit_free;
796 }
797
798 fd = fds[0];
799exit_free:
800 free(fds);
801 return fd;
802}
803
804static int map_fd_by_name(char *name, int **fds)
805{
806 unsigned int id = 0;
807 int fd, nb_fds = 0;
808 void *tmp;
809 int err;
810
811 while (true) {
812 struct bpf_map_info info = {};
813 __u32 len = sizeof(info);
814
815 err = bpf_map_get_next_id(id, &id);
816 if (err) {
817 if (errno != ENOENT) {
818 p_err("%s", strerror(errno));
819 goto err_close_fds;
820 }
821 return nb_fds;
822 }
823
824 fd = bpf_map_get_fd_by_id(id);
825 if (fd < 0) {
826 p_err("can't get map by id (%u): %s",
827 id, strerror(errno));
828 goto err_close_fds;
829 }
830
831 err = bpf_obj_get_info_by_fd(fd, &info, &len);
832 if (err) {
833 p_err("can't get map info (%u): %s",
834 id, strerror(errno));
835 goto err_close_fd;
836 }
837
838 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) {
839 close(fd);
840 continue;
841 }
842
843 if (nb_fds > 0) {
844 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
845 if (!tmp) {
846 p_err("failed to realloc");
847 goto err_close_fd;
848 }
849 *fds = tmp;
850 }
851 (*fds)[nb_fds++] = fd;
852 }
853
854err_close_fd:
855 close(fd);
856err_close_fds:
857 while (--nb_fds >= 0)
858 close((*fds)[nb_fds]);
859 return -1;
860}
861
862int map_parse_fds(int *argc, char ***argv, int **fds)
863{
864 if (is_prefix(**argv, "id")) {
865 unsigned int id;
866 char *endptr;
867
868 NEXT_ARGP();
869
870 id = strtoul(**argv, &endptr, 0);
871 if (*endptr) {
872 p_err("can't parse %s as ID", **argv);
873 return -1;
874 }
875 NEXT_ARGP();
876
877 (*fds)[0] = bpf_map_get_fd_by_id(id);
878 if ((*fds)[0] < 0) {
879 p_err("get map by id (%u): %s", id, strerror(errno));
880 return -1;
881 }
882 return 1;
883 } else if (is_prefix(**argv, "name")) {
884 char *name;
885
886 NEXT_ARGP();
887
888 name = **argv;
889 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
890 p_err("can't parse name");
891 return -1;
892 }
893 NEXT_ARGP();
894
895 return map_fd_by_name(name, fds);
896 } else if (is_prefix(**argv, "pinned")) {
897 char *path;
898
899 NEXT_ARGP();
900
901 path = **argv;
902 NEXT_ARGP();
903
904 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP);
905 if ((*fds)[0] < 0)
906 return -1;
907 return 1;
908 }
909
910 p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv);
911 return -1;
912}
913
914int map_parse_fd(int *argc, char ***argv)
915{
916 int *fds = NULL;
917 int nb_fds, fd;
918
919 fds = malloc(sizeof(int));
920 if (!fds) {
921 p_err("mem alloc failed");
922 return -1;
923 }
924 nb_fds = map_parse_fds(argc, argv, &fds);
925 if (nb_fds != 1) {
926 if (nb_fds > 1) {
927 p_err("several maps match this handle");
928 while (nb_fds--)
929 close(fds[nb_fds]);
930 }
931 fd = -1;
932 goto exit_free;
933 }
934
935 fd = fds[0];
936exit_free:
937 free(fds);
938 return fd;
939}
940
941int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
942{
943 int err;
944 int fd;
945
946 fd = map_parse_fd(argc, argv);
947 if (fd < 0)
948 return -1;
949
950 err = bpf_obj_get_info_by_fd(fd, info, info_len);
951 if (err) {
952 p_err("can't get map info: %s", strerror(errno));
953 close(fd);
954 return err;
955 }
956
957 return fd;
958}
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
40void 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
58void 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
71static bool is_bpffs(const 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 */
98static 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
142void 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
150static int
151mnt_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
182int 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
196int 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
218out_free:
219 free(pname);
220out_ret:
221 return fd;
222}
223
224int 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
247int mount_bpffs_for_pin(const char *name, bool is_dir)
248{
249 char err_str[ERR_MAX_LEN];
250 char *file;
251 char *dir;
252 int err = 0;
253
254 if (is_dir && is_bpffs(name))
255 return err;
256
257 file = malloc(strlen(name) + 1);
258 if (!file) {
259 p_err("mem alloc failed");
260 return -1;
261 }
262
263 strcpy(file, name);
264 dir = dirname(file);
265
266 if (is_bpffs(dir))
267 /* nothing to do if already mounted */
268 goto out_free;
269
270 if (block_mount) {
271 p_err("no BPF file system found, not mounting it due to --nomount option");
272 err = -1;
273 goto out_free;
274 }
275
276 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
277 if (err) {
278 err_str[ERR_MAX_LEN - 1] = '\0';
279 p_err("can't mount BPF file system to pin the object (%s): %s",
280 name, err_str);
281 }
282
283out_free:
284 free(file);
285 return err;
286}
287
288int do_pin_fd(int fd, const char *name)
289{
290 int err;
291
292 err = mount_bpffs_for_pin(name, false);
293 if (err)
294 return err;
295
296 err = bpf_obj_pin(fd, name);
297 if (err)
298 p_err("can't pin the object (%s): %s", name, strerror(errno));
299
300 return err;
301}
302
303int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***))
304{
305 int err;
306 int fd;
307
308 if (!REQ_ARGS(3))
309 return -EINVAL;
310
311 fd = get_fd(&argc, &argv);
312 if (fd < 0)
313 return fd;
314
315 err = do_pin_fd(fd, *argv);
316
317 close(fd);
318 return err;
319}
320
321const char *get_fd_type_name(enum bpf_obj_type type)
322{
323 static const char * const names[] = {
324 [BPF_OBJ_UNKNOWN] = "unknown",
325 [BPF_OBJ_PROG] = "prog",
326 [BPF_OBJ_MAP] = "map",
327 [BPF_OBJ_LINK] = "link",
328 };
329
330 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
331 return names[BPF_OBJ_UNKNOWN];
332
333 return names[type];
334}
335
336void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd,
337 char *name_buff, size_t buff_len)
338{
339 const char *prog_name = prog_info->name;
340 const struct btf_type *func_type;
341 const struct bpf_func_info finfo = {};
342 struct bpf_prog_info info = {};
343 __u32 info_len = sizeof(info);
344 struct btf *prog_btf = NULL;
345
346 if (buff_len <= BPF_OBJ_NAME_LEN ||
347 strlen(prog_info->name) < BPF_OBJ_NAME_LEN - 1)
348 goto copy_name;
349
350 if (!prog_info->btf_id || prog_info->nr_func_info == 0)
351 goto copy_name;
352
353 info.nr_func_info = 1;
354 info.func_info_rec_size = prog_info->func_info_rec_size;
355 if (info.func_info_rec_size > sizeof(finfo))
356 info.func_info_rec_size = sizeof(finfo);
357 info.func_info = ptr_to_u64(&finfo);
358
359 if (bpf_prog_get_info_by_fd(prog_fd, &info, &info_len))
360 goto copy_name;
361
362 prog_btf = btf__load_from_kernel_by_id(info.btf_id);
363 if (!prog_btf)
364 goto copy_name;
365
366 func_type = btf__type_by_id(prog_btf, finfo.type_id);
367 if (!func_type || !btf_is_func(func_type))
368 goto copy_name;
369
370 prog_name = btf__name_by_offset(prog_btf, func_type->name_off);
371
372copy_name:
373 snprintf(name_buff, buff_len, "%s", prog_name);
374
375 if (prog_btf)
376 btf__free(prog_btf);
377}
378
379int get_fd_type(int fd)
380{
381 char path[PATH_MAX];
382 char buf[512];
383 ssize_t n;
384
385 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
386
387 n = readlink(path, buf, sizeof(buf));
388 if (n < 0) {
389 p_err("can't read link type: %s", strerror(errno));
390 return -1;
391 }
392 if (n == sizeof(path)) {
393 p_err("can't read link type: path too long!");
394 return -1;
395 }
396
397 if (strstr(buf, "bpf-map"))
398 return BPF_OBJ_MAP;
399 else if (strstr(buf, "bpf-prog"))
400 return BPF_OBJ_PROG;
401 else if (strstr(buf, "bpf-link"))
402 return BPF_OBJ_LINK;
403
404 return BPF_OBJ_UNKNOWN;
405}
406
407char *get_fdinfo(int fd, const char *key)
408{
409 char path[PATH_MAX];
410 char *line = NULL;
411 size_t line_n = 0;
412 ssize_t n;
413 FILE *fdi;
414
415 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
416
417 fdi = fopen(path, "r");
418 if (!fdi)
419 return NULL;
420
421 while ((n = getline(&line, &line_n, fdi)) > 0) {
422 char *value;
423 int len;
424
425 if (!strstr(line, key))
426 continue;
427
428 fclose(fdi);
429
430 value = strchr(line, '\t');
431 if (!value || !value[1]) {
432 free(line);
433 return NULL;
434 }
435 value++;
436
437 len = strlen(value);
438 memmove(line, value, len);
439 line[len - 1] = '\0';
440
441 return line;
442 }
443
444 free(line);
445 fclose(fdi);
446 return NULL;
447}
448
449void print_data_json(uint8_t *data, size_t len)
450{
451 unsigned int i;
452
453 jsonw_start_array(json_wtr);
454 for (i = 0; i < len; i++)
455 jsonw_printf(json_wtr, "%d", data[i]);
456 jsonw_end_array(json_wtr);
457}
458
459void print_hex_data_json(uint8_t *data, size_t len)
460{
461 unsigned int i;
462
463 jsonw_start_array(json_wtr);
464 for (i = 0; i < len; i++)
465 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
466 jsonw_end_array(json_wtr);
467}
468
469/* extra params for nftw cb */
470static struct hashmap *build_fn_table;
471static enum bpf_obj_type build_fn_type;
472
473static int do_build_table_cb(const char *fpath, const struct stat *sb,
474 int typeflag, struct FTW *ftwbuf)
475{
476 struct bpf_prog_info pinned_info;
477 __u32 len = sizeof(pinned_info);
478 enum bpf_obj_type objtype;
479 int fd, err = 0;
480 char *path;
481
482 if (typeflag != FTW_F)
483 goto out_ret;
484
485 fd = open_obj_pinned(fpath, true);
486 if (fd < 0)
487 goto out_ret;
488
489 objtype = get_fd_type(fd);
490 if (objtype != build_fn_type)
491 goto out_close;
492
493 memset(&pinned_info, 0, sizeof(pinned_info));
494 if (bpf_prog_get_info_by_fd(fd, &pinned_info, &len))
495 goto out_close;
496
497 path = strdup(fpath);
498 if (!path) {
499 err = -1;
500 goto out_close;
501 }
502
503 err = hashmap__append(build_fn_table, pinned_info.id, path);
504 if (err) {
505 p_err("failed to append entry to hashmap for ID %u, path '%s': %s",
506 pinned_info.id, path, strerror(errno));
507 free(path);
508 goto out_close;
509 }
510
511out_close:
512 close(fd);
513out_ret:
514 return err;
515}
516
517int build_pinned_obj_table(struct hashmap *tab,
518 enum bpf_obj_type type)
519{
520 struct mntent *mntent = NULL;
521 FILE *mntfile = NULL;
522 int flags = FTW_PHYS;
523 int nopenfd = 16;
524 int err = 0;
525
526 mntfile = setmntent("/proc/mounts", "r");
527 if (!mntfile)
528 return -1;
529
530 build_fn_table = tab;
531 build_fn_type = type;
532
533 while ((mntent = getmntent(mntfile))) {
534 char *path = mntent->mnt_dir;
535
536 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
537 continue;
538 err = nftw(path, do_build_table_cb, nopenfd, flags);
539 if (err)
540 break;
541 }
542 fclose(mntfile);
543 return err;
544}
545
546void delete_pinned_obj_table(struct hashmap *map)
547{
548 struct hashmap_entry *entry;
549 size_t bkt;
550
551 if (!map)
552 return;
553
554 hashmap__for_each_entry(map, entry, bkt)
555 free(entry->pvalue);
556
557 hashmap__free(map);
558}
559
560unsigned int get_page_size(void)
561{
562 static int result;
563
564 if (!result)
565 result = getpagesize();
566 return result;
567}
568
569unsigned int get_possible_cpus(void)
570{
571 int cpus = libbpf_num_possible_cpus();
572
573 if (cpus < 0) {
574 p_err("Can't get # of possible cpus: %s", strerror(-cpus));
575 exit(-1);
576 }
577 return cpus;
578}
579
580static char *
581ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
582{
583 struct stat st;
584 int err;
585
586 err = stat("/proc/self/ns/net", &st);
587 if (err) {
588 p_err("Can't stat /proc/self: %s", strerror(errno));
589 return NULL;
590 }
591
592 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
593 return NULL;
594
595 return if_indextoname(ifindex, buf);
596}
597
598static int read_sysfs_hex_int(char *path)
599{
600 char vendor_id_buf[8];
601 int len;
602 int fd;
603
604 fd = open(path, O_RDONLY);
605 if (fd < 0) {
606 p_err("Can't open %s: %s", path, strerror(errno));
607 return -1;
608 }
609
610 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
611 close(fd);
612 if (len < 0) {
613 p_err("Can't read %s: %s", path, strerror(errno));
614 return -1;
615 }
616 if (len >= (int)sizeof(vendor_id_buf)) {
617 p_err("Value in %s too long", path);
618 return -1;
619 }
620
621 vendor_id_buf[len] = 0;
622
623 return strtol(vendor_id_buf, NULL, 0);
624}
625
626static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
627{
628 char full_path[64];
629
630 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
631 devname, entry_name);
632
633 return read_sysfs_hex_int(full_path);
634}
635
636const char *
637ifindex_to_arch(__u32 ifindex, __u64 ns_dev, __u64 ns_ino, const char **opt)
638{
639 __maybe_unused int device_id;
640 char devname[IF_NAMESIZE];
641 int vendor_id;
642
643 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
644 p_err("Can't get net device name for ifindex %d: %s", ifindex,
645 strerror(errno));
646 return NULL;
647 }
648
649 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
650 if (vendor_id < 0) {
651 p_err("Can't get device vendor id for %s", devname);
652 return NULL;
653 }
654
655 switch (vendor_id) {
656#ifdef HAVE_LIBBFD_SUPPORT
657 case 0x19ee:
658 device_id = read_sysfs_netdev_hex_int(devname, "device");
659 if (device_id != 0x4000 &&
660 device_id != 0x6000 &&
661 device_id != 0x6003)
662 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
663 *opt = "ctx4";
664 return "NFP-6xxx";
665#endif /* HAVE_LIBBFD_SUPPORT */
666 /* No NFP support in LLVM, we have no valid triple to return. */
667 default:
668 p_err("Can't get arch name for device vendor id 0x%04x",
669 vendor_id);
670 return NULL;
671 }
672}
673
674void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
675{
676 char name[IF_NAMESIZE];
677
678 if (!ifindex)
679 return;
680
681 printf(" offloaded_to ");
682 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
683 printf("%s", name);
684 else
685 printf("ifindex %u ns_dev %llu ns_ino %llu",
686 ifindex, ns_dev, ns_inode);
687}
688
689void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
690{
691 char name[IF_NAMESIZE];
692
693 if (!ifindex)
694 return;
695
696 jsonw_name(json_wtr, "dev");
697 jsonw_start_object(json_wtr);
698 jsonw_uint_field(json_wtr, "ifindex", ifindex);
699 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
700 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
701 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
702 jsonw_string_field(json_wtr, "ifname", name);
703 jsonw_end_object(json_wtr);
704}
705
706int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
707{
708 char *endptr;
709
710 NEXT_ARGP();
711
712 if (*val) {
713 p_err("%s already specified", what);
714 return -1;
715 }
716
717 *val = strtoul(**argv, &endptr, 0);
718 if (*endptr) {
719 p_err("can't parse %s as %s", **argv, what);
720 return -1;
721 }
722 NEXT_ARGP();
723
724 return 0;
725}
726
727int __printf(2, 0)
728print_all_levels(__maybe_unused enum libbpf_print_level level,
729 const char *format, va_list args)
730{
731 return vfprintf(stderr, format, args);
732}
733
734static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
735{
736 char prog_name[MAX_PROG_FULL_NAME];
737 unsigned int id = 0;
738 int fd, nb_fds = 0;
739 void *tmp;
740 int err;
741
742 while (true) {
743 struct bpf_prog_info info = {};
744 __u32 len = sizeof(info);
745
746 err = bpf_prog_get_next_id(id, &id);
747 if (err) {
748 if (errno != ENOENT) {
749 p_err("%s", strerror(errno));
750 goto err_close_fds;
751 }
752 return nb_fds;
753 }
754
755 fd = bpf_prog_get_fd_by_id(id);
756 if (fd < 0) {
757 p_err("can't get prog by id (%u): %s",
758 id, strerror(errno));
759 goto err_close_fds;
760 }
761
762 err = bpf_prog_get_info_by_fd(fd, &info, &len);
763 if (err) {
764 p_err("can't get prog info (%u): %s",
765 id, strerror(errno));
766 goto err_close_fd;
767 }
768
769 if (tag && memcmp(nametag, info.tag, BPF_TAG_SIZE)) {
770 close(fd);
771 continue;
772 }
773
774 if (!tag) {
775 get_prog_full_name(&info, fd, prog_name,
776 sizeof(prog_name));
777 if (strncmp(nametag, prog_name, sizeof(prog_name))) {
778 close(fd);
779 continue;
780 }
781 }
782
783 if (nb_fds > 0) {
784 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
785 if (!tmp) {
786 p_err("failed to realloc");
787 goto err_close_fd;
788 }
789 *fds = tmp;
790 }
791 (*fds)[nb_fds++] = fd;
792 }
793
794err_close_fd:
795 close(fd);
796err_close_fds:
797 while (--nb_fds >= 0)
798 close((*fds)[nb_fds]);
799 return -1;
800}
801
802int prog_parse_fds(int *argc, char ***argv, int **fds)
803{
804 if (is_prefix(**argv, "id")) {
805 unsigned int id;
806 char *endptr;
807
808 NEXT_ARGP();
809
810 id = strtoul(**argv, &endptr, 0);
811 if (*endptr) {
812 p_err("can't parse %s as ID", **argv);
813 return -1;
814 }
815 NEXT_ARGP();
816
817 (*fds)[0] = bpf_prog_get_fd_by_id(id);
818 if ((*fds)[0] < 0) {
819 p_err("get by id (%u): %s", id, strerror(errno));
820 return -1;
821 }
822 return 1;
823 } else if (is_prefix(**argv, "tag")) {
824 unsigned char tag[BPF_TAG_SIZE];
825
826 NEXT_ARGP();
827
828 if (sscanf(**argv, BPF_TAG_FMT, tag, tag + 1, tag + 2,
829 tag + 3, tag + 4, tag + 5, tag + 6, tag + 7)
830 != BPF_TAG_SIZE) {
831 p_err("can't parse tag");
832 return -1;
833 }
834 NEXT_ARGP();
835
836 return prog_fd_by_nametag(tag, fds, true);
837 } else if (is_prefix(**argv, "name")) {
838 char *name;
839
840 NEXT_ARGP();
841
842 name = **argv;
843 if (strlen(name) > MAX_PROG_FULL_NAME - 1) {
844 p_err("can't parse name");
845 return -1;
846 }
847 NEXT_ARGP();
848
849 return prog_fd_by_nametag(name, fds, false);
850 } else if (is_prefix(**argv, "pinned")) {
851 char *path;
852
853 NEXT_ARGP();
854
855 path = **argv;
856 NEXT_ARGP();
857
858 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG);
859 if ((*fds)[0] < 0)
860 return -1;
861 return 1;
862 }
863
864 p_err("expected 'id', 'tag', 'name' or 'pinned', got: '%s'?", **argv);
865 return -1;
866}
867
868int prog_parse_fd(int *argc, char ***argv)
869{
870 int *fds = NULL;
871 int nb_fds, fd;
872
873 fds = malloc(sizeof(int));
874 if (!fds) {
875 p_err("mem alloc failed");
876 return -1;
877 }
878 nb_fds = prog_parse_fds(argc, argv, &fds);
879 if (nb_fds != 1) {
880 if (nb_fds > 1) {
881 p_err("several programs match this handle");
882 while (nb_fds--)
883 close(fds[nb_fds]);
884 }
885 fd = -1;
886 goto exit_free;
887 }
888
889 fd = fds[0];
890exit_free:
891 free(fds);
892 return fd;
893}
894
895static int map_fd_by_name(char *name, int **fds)
896{
897 unsigned int id = 0;
898 int fd, nb_fds = 0;
899 void *tmp;
900 int err;
901
902 while (true) {
903 struct bpf_map_info info = {};
904 __u32 len = sizeof(info);
905
906 err = bpf_map_get_next_id(id, &id);
907 if (err) {
908 if (errno != ENOENT) {
909 p_err("%s", strerror(errno));
910 goto err_close_fds;
911 }
912 return nb_fds;
913 }
914
915 fd = bpf_map_get_fd_by_id(id);
916 if (fd < 0) {
917 p_err("can't get map by id (%u): %s",
918 id, strerror(errno));
919 goto err_close_fds;
920 }
921
922 err = bpf_map_get_info_by_fd(fd, &info, &len);
923 if (err) {
924 p_err("can't get map info (%u): %s",
925 id, strerror(errno));
926 goto err_close_fd;
927 }
928
929 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) {
930 close(fd);
931 continue;
932 }
933
934 if (nb_fds > 0) {
935 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
936 if (!tmp) {
937 p_err("failed to realloc");
938 goto err_close_fd;
939 }
940 *fds = tmp;
941 }
942 (*fds)[nb_fds++] = fd;
943 }
944
945err_close_fd:
946 close(fd);
947err_close_fds:
948 while (--nb_fds >= 0)
949 close((*fds)[nb_fds]);
950 return -1;
951}
952
953int map_parse_fds(int *argc, char ***argv, int **fds)
954{
955 if (is_prefix(**argv, "id")) {
956 unsigned int id;
957 char *endptr;
958
959 NEXT_ARGP();
960
961 id = strtoul(**argv, &endptr, 0);
962 if (*endptr) {
963 p_err("can't parse %s as ID", **argv);
964 return -1;
965 }
966 NEXT_ARGP();
967
968 (*fds)[0] = bpf_map_get_fd_by_id(id);
969 if ((*fds)[0] < 0) {
970 p_err("get map by id (%u): %s", id, strerror(errno));
971 return -1;
972 }
973 return 1;
974 } else if (is_prefix(**argv, "name")) {
975 char *name;
976
977 NEXT_ARGP();
978
979 name = **argv;
980 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
981 p_err("can't parse name");
982 return -1;
983 }
984 NEXT_ARGP();
985
986 return map_fd_by_name(name, fds);
987 } else if (is_prefix(**argv, "pinned")) {
988 char *path;
989
990 NEXT_ARGP();
991
992 path = **argv;
993 NEXT_ARGP();
994
995 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP);
996 if ((*fds)[0] < 0)
997 return -1;
998 return 1;
999 }
1000
1001 p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv);
1002 return -1;
1003}
1004
1005int map_parse_fd(int *argc, char ***argv)
1006{
1007 int *fds = NULL;
1008 int nb_fds, fd;
1009
1010 fds = malloc(sizeof(int));
1011 if (!fds) {
1012 p_err("mem alloc failed");
1013 return -1;
1014 }
1015 nb_fds = map_parse_fds(argc, argv, &fds);
1016 if (nb_fds != 1) {
1017 if (nb_fds > 1) {
1018 p_err("several maps match this handle");
1019 while (nb_fds--)
1020 close(fds[nb_fds]);
1021 }
1022 fd = -1;
1023 goto exit_free;
1024 }
1025
1026 fd = fds[0];
1027exit_free:
1028 free(fds);
1029 return fd;
1030}
1031
1032int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info,
1033 __u32 *info_len)
1034{
1035 int err;
1036 int fd;
1037
1038 fd = map_parse_fd(argc, argv);
1039 if (fd < 0)
1040 return -1;
1041
1042 err = bpf_map_get_info_by_fd(fd, info, info_len);
1043 if (err) {
1044 p_err("can't get map info: %s", strerror(errno));
1045 close(fd);
1046 return err;
1047 }
1048
1049 return fd;
1050}
1051
1052size_t hash_fn_for_key_as_id(long key, void *ctx)
1053{
1054 return key;
1055}
1056
1057bool equal_fn_for_key_as_id(long k1, long k2, void *ctx)
1058{
1059 return k1 == k2;
1060}
1061
1062const char *bpf_attach_type_input_str(enum bpf_attach_type t)
1063{
1064 switch (t) {
1065 case BPF_CGROUP_INET_INGRESS: return "ingress";
1066 case BPF_CGROUP_INET_EGRESS: return "egress";
1067 case BPF_CGROUP_INET_SOCK_CREATE: return "sock_create";
1068 case BPF_CGROUP_INET_SOCK_RELEASE: return "sock_release";
1069 case BPF_CGROUP_SOCK_OPS: return "sock_ops";
1070 case BPF_CGROUP_DEVICE: return "device";
1071 case BPF_CGROUP_INET4_BIND: return "bind4";
1072 case BPF_CGROUP_INET6_BIND: return "bind6";
1073 case BPF_CGROUP_INET4_CONNECT: return "connect4";
1074 case BPF_CGROUP_INET6_CONNECT: return "connect6";
1075 case BPF_CGROUP_INET4_POST_BIND: return "post_bind4";
1076 case BPF_CGROUP_INET6_POST_BIND: return "post_bind6";
1077 case BPF_CGROUP_INET4_GETPEERNAME: return "getpeername4";
1078 case BPF_CGROUP_INET6_GETPEERNAME: return "getpeername6";
1079 case BPF_CGROUP_INET4_GETSOCKNAME: return "getsockname4";
1080 case BPF_CGROUP_INET6_GETSOCKNAME: return "getsockname6";
1081 case BPF_CGROUP_UDP4_SENDMSG: return "sendmsg4";
1082 case BPF_CGROUP_UDP6_SENDMSG: return "sendmsg6";
1083 case BPF_CGROUP_SYSCTL: return "sysctl";
1084 case BPF_CGROUP_UDP4_RECVMSG: return "recvmsg4";
1085 case BPF_CGROUP_UDP6_RECVMSG: return "recvmsg6";
1086 case BPF_CGROUP_GETSOCKOPT: return "getsockopt";
1087 case BPF_CGROUP_SETSOCKOPT: return "setsockopt";
1088 case BPF_TRACE_RAW_TP: return "raw_tp";
1089 case BPF_TRACE_FENTRY: return "fentry";
1090 case BPF_TRACE_FEXIT: return "fexit";
1091 case BPF_MODIFY_RETURN: return "mod_ret";
1092 case BPF_SK_REUSEPORT_SELECT: return "sk_skb_reuseport_select";
1093 case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE: return "sk_skb_reuseport_select_or_migrate";
1094 default: return libbpf_bpf_attach_type_str(t);
1095 }
1096}
1097
1098int pathname_concat(char *buf, int buf_sz, const char *path,
1099 const char *name)
1100{
1101 int len;
1102
1103 len = snprintf(buf, buf_sz, "%s/%s", path, name);
1104 if (len < 0)
1105 return -EINVAL;
1106 if (len >= buf_sz)
1107 return -ENAMETOOLONG;
1108
1109 return 0;
1110}