1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
3
4 #include <ctype.h>
5 #include <errno.h>
6 #include <fcntl.h>
7 #include <fts.h>
8 #include <libgen.h>
9 #include <mntent.h>
10 #include <stdbool.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <unistd.h>
15 #include <linux/limits.h>
16 #include <linux/magic.h>
17 #include <net/if.h>
18 #include <sys/mount.h>
19 #include <sys/resource.h>
20 #include <sys/stat.h>
21 #include <sys/vfs.h>
22
23 #include <bpf.h>
24 #include <libbpf.h> /* libbpf_num_possible_cpus */
25
26 #include "main.h"
27
28 #ifndef BPF_FS_MAGIC
29 #define BPF_FS_MAGIC 0xcafe4a11
30 #endif
31
p_err(const char * fmt,...)32 void p_err(const char *fmt, ...)
33 {
34 va_list ap;
35
36 va_start(ap, fmt);
37 if (json_output) {
38 jsonw_start_object(json_wtr);
39 jsonw_name(json_wtr, "error");
40 jsonw_vprintf_enquote(json_wtr, fmt, ap);
41 jsonw_end_object(json_wtr);
42 } else {
43 fprintf(stderr, "Error: ");
44 vfprintf(stderr, fmt, ap);
45 fprintf(stderr, "\n");
46 }
47 va_end(ap);
48 }
49
p_info(const char * fmt,...)50 void p_info(const char *fmt, ...)
51 {
52 va_list ap;
53
54 if (json_output)
55 return;
56
57 va_start(ap, fmt);
58 vfprintf(stderr, fmt, ap);
59 fprintf(stderr, "\n");
60 va_end(ap);
61 }
62
is_bpffs(char * path)63 static bool is_bpffs(char *path)
64 {
65 struct statfs st_fs;
66
67 if (statfs(path, &st_fs) < 0)
68 return false;
69
70 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
71 }
72
set_max_rlimit(void)73 void set_max_rlimit(void)
74 {
75 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
76
77 setrlimit(RLIMIT_MEMLOCK, &rinf);
78 }
79
80 static int
mnt_fs(const char * target,const char * type,char * buff,size_t bufflen)81 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
82 {
83 bool bind_done = false;
84
85 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
86 if (errno != EINVAL || bind_done) {
87 snprintf(buff, bufflen,
88 "mount --make-private %s failed: %s",
89 target, strerror(errno));
90 return -1;
91 }
92
93 if (mount(target, target, "none", MS_BIND, NULL)) {
94 snprintf(buff, bufflen,
95 "mount --bind %s %s failed: %s",
96 target, target, strerror(errno));
97 return -1;
98 }
99
100 bind_done = true;
101 }
102
103 if (mount(type, target, type, 0, "mode=0700")) {
104 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s",
105 type, type, target, strerror(errno));
106 return -1;
107 }
108
109 return 0;
110 }
111
mount_tracefs(const char * target)112 int mount_tracefs(const char *target)
113 {
114 char err_str[ERR_MAX_LEN];
115 int err;
116
117 err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
118 if (err) {
119 err_str[ERR_MAX_LEN - 1] = '\0';
120 p_err("can't mount tracefs: %s", err_str);
121 }
122
123 return err;
124 }
125
open_obj_pinned(char * path,bool quiet)126 int open_obj_pinned(char *path, bool quiet)
127 {
128 int fd;
129
130 fd = bpf_obj_get(path);
131 if (fd < 0) {
132 if (!quiet)
133 p_err("bpf obj get (%s): %s", path,
134 errno == EACCES && !is_bpffs(dirname(path)) ?
135 "directory not in bpf file system (bpffs)" :
136 strerror(errno));
137 return -1;
138 }
139
140 return fd;
141 }
142
open_obj_pinned_any(char * path,enum bpf_obj_type exp_type)143 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
144 {
145 enum bpf_obj_type type;
146 int fd;
147
148 fd = open_obj_pinned(path, false);
149 if (fd < 0)
150 return -1;
151
152 type = get_fd_type(fd);
153 if (type < 0) {
154 close(fd);
155 return type;
156 }
157 if (type != exp_type) {
158 p_err("incorrect object type: %s", get_fd_type_name(type));
159 close(fd);
160 return -1;
161 }
162
163 return fd;
164 }
165
mount_bpffs_for_pin(const char * name)166 int mount_bpffs_for_pin(const char *name)
167 {
168 char err_str[ERR_MAX_LEN];
169 char *file;
170 char *dir;
171 int err = 0;
172
173 file = malloc(strlen(name) + 1);
174 if (!file) {
175 p_err("mem alloc failed");
176 return -1;
177 }
178
179 strcpy(file, name);
180 dir = dirname(file);
181
182 if (is_bpffs(dir))
183 /* nothing to do if already mounted */
184 goto out_free;
185
186 if (block_mount) {
187 p_err("no BPF file system found, not mounting it due to --nomount option");
188 err = -1;
189 goto out_free;
190 }
191
192 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
193 if (err) {
194 err_str[ERR_MAX_LEN - 1] = '\0';
195 p_err("can't mount BPF file system to pin the object (%s): %s",
196 name, err_str);
197 }
198
199 out_free:
200 free(file);
201 return err;
202 }
203
do_pin_fd(int fd,const char * name)204 int do_pin_fd(int fd, const char *name)
205 {
206 int err;
207
208 err = mount_bpffs_for_pin(name);
209 if (err)
210 return err;
211
212 err = bpf_obj_pin(fd, name);
213 if (err)
214 p_err("can't pin the object (%s): %s", name, strerror(errno));
215
216 return err;
217 }
218
do_pin_any(int argc,char ** argv,int (* get_fd_by_id)(__u32))219 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
220 {
221 unsigned int id;
222 char *endptr;
223 int err;
224 int fd;
225
226 if (argc < 3) {
227 p_err("too few arguments, id ID and FILE path is required");
228 return -1;
229 } else if (argc > 3) {
230 p_err("too many arguments");
231 return -1;
232 }
233
234 if (!is_prefix(*argv, "id")) {
235 p_err("expected 'id' got %s", *argv);
236 return -1;
237 }
238 NEXT_ARG();
239
240 id = strtoul(*argv, &endptr, 0);
241 if (*endptr) {
242 p_err("can't parse %s as ID", *argv);
243 return -1;
244 }
245 NEXT_ARG();
246
247 fd = get_fd_by_id(id);
248 if (fd < 0) {
249 p_err("can't open object by id (%u): %s", id, strerror(errno));
250 return -1;
251 }
252
253 err = do_pin_fd(fd, *argv);
254
255 close(fd);
256 return err;
257 }
258
get_fd_type_name(enum bpf_obj_type type)259 const char *get_fd_type_name(enum bpf_obj_type type)
260 {
261 static const char * const names[] = {
262 [BPF_OBJ_UNKNOWN] = "unknown",
263 [BPF_OBJ_PROG] = "prog",
264 [BPF_OBJ_MAP] = "map",
265 };
266
267 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
268 return names[BPF_OBJ_UNKNOWN];
269
270 return names[type];
271 }
272
get_fd_type(int fd)273 int get_fd_type(int fd)
274 {
275 char path[PATH_MAX];
276 char buf[512];
277 ssize_t n;
278
279 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
280
281 n = readlink(path, buf, sizeof(buf));
282 if (n < 0) {
283 p_err("can't read link type: %s", strerror(errno));
284 return -1;
285 }
286 if (n == sizeof(path)) {
287 p_err("can't read link type: path too long!");
288 return -1;
289 }
290
291 if (strstr(buf, "bpf-map"))
292 return BPF_OBJ_MAP;
293 else if (strstr(buf, "bpf-prog"))
294 return BPF_OBJ_PROG;
295
296 return BPF_OBJ_UNKNOWN;
297 }
298
get_fdinfo(int fd,const char * key)299 char *get_fdinfo(int fd, const char *key)
300 {
301 char path[PATH_MAX];
302 char *line = NULL;
303 size_t line_n = 0;
304 ssize_t n;
305 FILE *fdi;
306
307 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
308
309 fdi = fopen(path, "r");
310 if (!fdi)
311 return NULL;
312
313 while ((n = getline(&line, &line_n, fdi)) > 0) {
314 char *value;
315 int len;
316
317 if (!strstr(line, key))
318 continue;
319
320 fclose(fdi);
321
322 value = strchr(line, '\t');
323 if (!value || !value[1]) {
324 free(line);
325 return NULL;
326 }
327 value++;
328
329 len = strlen(value);
330 memmove(line, value, len);
331 line[len - 1] = '\0';
332
333 return line;
334 }
335
336 free(line);
337 fclose(fdi);
338 return NULL;
339 }
340
print_data_json(uint8_t * data,size_t len)341 void print_data_json(uint8_t *data, size_t len)
342 {
343 unsigned int i;
344
345 jsonw_start_array(json_wtr);
346 for (i = 0; i < len; i++)
347 jsonw_printf(json_wtr, "%d", data[i]);
348 jsonw_end_array(json_wtr);
349 }
350
print_hex_data_json(uint8_t * data,size_t len)351 void print_hex_data_json(uint8_t *data, size_t len)
352 {
353 unsigned int i;
354
355 jsonw_start_array(json_wtr);
356 for (i = 0; i < len; i++)
357 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
358 jsonw_end_array(json_wtr);
359 }
360
build_pinned_obj_table(struct pinned_obj_table * tab,enum bpf_obj_type type)361 int build_pinned_obj_table(struct pinned_obj_table *tab,
362 enum bpf_obj_type type)
363 {
364 struct bpf_prog_info pinned_info = {};
365 struct pinned_obj *obj_node = NULL;
366 __u32 len = sizeof(pinned_info);
367 struct mntent *mntent = NULL;
368 enum bpf_obj_type objtype;
369 FILE *mntfile = NULL;
370 FTSENT *ftse = NULL;
371 FTS *fts = NULL;
372 int fd, err;
373
374 mntfile = setmntent("/proc/mounts", "r");
375 if (!mntfile)
376 return -1;
377
378 while ((mntent = getmntent(mntfile))) {
379 char *path[] = { mntent->mnt_dir, NULL };
380
381 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
382 continue;
383
384 fts = fts_open(path, 0, NULL);
385 if (!fts)
386 continue;
387
388 while ((ftse = fts_read(fts))) {
389 if (!(ftse->fts_info & FTS_F))
390 continue;
391 fd = open_obj_pinned(ftse->fts_path, true);
392 if (fd < 0)
393 continue;
394
395 objtype = get_fd_type(fd);
396 if (objtype != type) {
397 close(fd);
398 continue;
399 }
400 memset(&pinned_info, 0, sizeof(pinned_info));
401 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
402 if (err) {
403 close(fd);
404 continue;
405 }
406
407 obj_node = malloc(sizeof(*obj_node));
408 if (!obj_node) {
409 close(fd);
410 fts_close(fts);
411 fclose(mntfile);
412 return -1;
413 }
414
415 memset(obj_node, 0, sizeof(*obj_node));
416 obj_node->id = pinned_info.id;
417 obj_node->path = strdup(ftse->fts_path);
418 hash_add(tab->table, &obj_node->hash, obj_node->id);
419
420 close(fd);
421 }
422 fts_close(fts);
423 }
424 fclose(mntfile);
425 return 0;
426 }
427
delete_pinned_obj_table(struct pinned_obj_table * tab)428 void delete_pinned_obj_table(struct pinned_obj_table *tab)
429 {
430 struct pinned_obj *obj;
431 struct hlist_node *tmp;
432 unsigned int bkt;
433
434 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
435 hash_del(&obj->hash);
436 free(obj->path);
437 free(obj);
438 }
439 }
440
get_page_size(void)441 unsigned int get_page_size(void)
442 {
443 static int result;
444
445 if (!result)
446 result = getpagesize();
447 return result;
448 }
449
get_possible_cpus(void)450 unsigned int get_possible_cpus(void)
451 {
452 int cpus = libbpf_num_possible_cpus();
453
454 if (cpus < 0) {
455 p_err("Can't get # of possible cpus: %s", strerror(-cpus));
456 exit(-1);
457 }
458 return cpus;
459 }
460
461 static char *
ifindex_to_name_ns(__u32 ifindex,__u32 ns_dev,__u32 ns_ino,char * buf)462 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
463 {
464 struct stat st;
465 int err;
466
467 err = stat("/proc/self/ns/net", &st);
468 if (err) {
469 p_err("Can't stat /proc/self: %s", strerror(errno));
470 return NULL;
471 }
472
473 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
474 return NULL;
475
476 return if_indextoname(ifindex, buf);
477 }
478
read_sysfs_hex_int(char * path)479 static int read_sysfs_hex_int(char *path)
480 {
481 char vendor_id_buf[8];
482 int len;
483 int fd;
484
485 fd = open(path, O_RDONLY);
486 if (fd < 0) {
487 p_err("Can't open %s: %s", path, strerror(errno));
488 return -1;
489 }
490
491 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
492 close(fd);
493 if (len < 0) {
494 p_err("Can't read %s: %s", path, strerror(errno));
495 return -1;
496 }
497 if (len >= (int)sizeof(vendor_id_buf)) {
498 p_err("Value in %s too long", path);
499 return -1;
500 }
501
502 vendor_id_buf[len] = 0;
503
504 return strtol(vendor_id_buf, NULL, 0);
505 }
506
read_sysfs_netdev_hex_int(char * devname,const char * entry_name)507 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
508 {
509 char full_path[64];
510
511 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
512 devname, entry_name);
513
514 return read_sysfs_hex_int(full_path);
515 }
516
517 const char *
ifindex_to_bfd_params(__u32 ifindex,__u64 ns_dev,__u64 ns_ino,const char ** opt)518 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
519 const char **opt)
520 {
521 char devname[IF_NAMESIZE];
522 int vendor_id;
523 int device_id;
524
525 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
526 p_err("Can't get net device name for ifindex %d: %s", ifindex,
527 strerror(errno));
528 return NULL;
529 }
530
531 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
532 if (vendor_id < 0) {
533 p_err("Can't get device vendor id for %s", devname);
534 return NULL;
535 }
536
537 switch (vendor_id) {
538 case 0x19ee:
539 device_id = read_sysfs_netdev_hex_int(devname, "device");
540 if (device_id != 0x4000 &&
541 device_id != 0x6000 &&
542 device_id != 0x6003)
543 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
544 *opt = "ctx4";
545 return "NFP-6xxx";
546 default:
547 p_err("Can't get bfd arch name for device vendor id 0x%04x",
548 vendor_id);
549 return NULL;
550 }
551 }
552
print_dev_plain(__u32 ifindex,__u64 ns_dev,__u64 ns_inode)553 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
554 {
555 char name[IF_NAMESIZE];
556
557 if (!ifindex)
558 return;
559
560 printf(" offloaded_to ");
561 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
562 printf("%s", name);
563 else
564 printf("ifindex %u ns_dev %llu ns_ino %llu",
565 ifindex, ns_dev, ns_inode);
566 }
567
print_dev_json(__u32 ifindex,__u64 ns_dev,__u64 ns_inode)568 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
569 {
570 char name[IF_NAMESIZE];
571
572 if (!ifindex)
573 return;
574
575 jsonw_name(json_wtr, "dev");
576 jsonw_start_object(json_wtr);
577 jsonw_uint_field(json_wtr, "ifindex", ifindex);
578 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
579 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
580 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
581 jsonw_string_field(json_wtr, "ifname", name);
582 jsonw_end_object(json_wtr);
583 }
584
parse_u32_arg(int * argc,char *** argv,__u32 * val,const char * what)585 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
586 {
587 char *endptr;
588
589 NEXT_ARGP();
590
591 if (*val) {
592 p_err("%s already specified", what);
593 return -1;
594 }
595
596 *val = strtoul(**argv, &endptr, 0);
597 if (*endptr) {
598 p_err("can't parse %s as %s", **argv, what);
599 return -1;
600 }
601 NEXT_ARGP();
602
603 return 0;
604 }
605