1 /*
2 * Copyright (C) 2017-2018 Netronome Systems, Inc.
3 *
4 * This software is dual licensed under the GNU General License Version 2,
5 * June 1991 as shown in the file COPYING in the top-level directory of this
6 * source tree or the BSD 2-Clause License provided below. You have the
7 * option to license this software under the complete terms of either license.
8 *
9 * The BSD 2-Clause License:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * 1. Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * 2. Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <ctype.h>
35 #include <errno.h>
36 #include <fcntl.h>
37 #include <fts.h>
38 #include <libgen.h>
39 #include <mntent.h>
40 #include <stdbool.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <linux/limits.h>
46 #include <linux/magic.h>
47 #include <net/if.h>
48 #include <sys/mount.h>
49 #include <sys/stat.h>
50 #include <sys/types.h>
51 #include <sys/vfs.h>
52
53 #include <bpf.h>
54
55 #include "main.h"
56
57 #ifndef BPF_FS_MAGIC
58 #define BPF_FS_MAGIC 0xcafe4a11
59 #endif
60
p_err(const char * fmt,...)61 void p_err(const char *fmt, ...)
62 {
63 va_list ap;
64
65 va_start(ap, fmt);
66 if (json_output) {
67 jsonw_start_object(json_wtr);
68 jsonw_name(json_wtr, "error");
69 jsonw_vprintf_enquote(json_wtr, fmt, ap);
70 jsonw_end_object(json_wtr);
71 } else {
72 fprintf(stderr, "Error: ");
73 vfprintf(stderr, fmt, ap);
74 fprintf(stderr, "\n");
75 }
76 va_end(ap);
77 }
78
p_info(const char * fmt,...)79 void p_info(const char *fmt, ...)
80 {
81 va_list ap;
82
83 if (json_output)
84 return;
85
86 va_start(ap, fmt);
87 vfprintf(stderr, fmt, ap);
88 fprintf(stderr, "\n");
89 va_end(ap);
90 }
91
is_bpffs(char * path)92 static bool is_bpffs(char *path)
93 {
94 struct statfs st_fs;
95
96 if (statfs(path, &st_fs) < 0)
97 return false;
98
99 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
100 }
101
mnt_bpffs(const char * target,char * buff,size_t bufflen)102 static int mnt_bpffs(const char *target, char *buff, size_t bufflen)
103 {
104 bool bind_done = false;
105
106 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
107 if (errno != EINVAL || bind_done) {
108 snprintf(buff, bufflen,
109 "mount --make-private %s failed: %s",
110 target, strerror(errno));
111 return -1;
112 }
113
114 if (mount(target, target, "none", MS_BIND, NULL)) {
115 snprintf(buff, bufflen,
116 "mount --bind %s %s failed: %s",
117 target, target, strerror(errno));
118 return -1;
119 }
120
121 bind_done = true;
122 }
123
124 if (mount("bpf", target, "bpf", 0, "mode=0700")) {
125 snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s",
126 target, strerror(errno));
127 return -1;
128 }
129
130 return 0;
131 }
132
open_obj_pinned(char * path)133 int open_obj_pinned(char *path)
134 {
135 int fd;
136
137 fd = bpf_obj_get(path);
138 if (fd < 0) {
139 p_err("bpf obj get (%s): %s", path,
140 errno == EACCES && !is_bpffs(dirname(path)) ?
141 "directory not in bpf file system (bpffs)" :
142 strerror(errno));
143 return -1;
144 }
145
146 return fd;
147 }
148
open_obj_pinned_any(char * path,enum bpf_obj_type exp_type)149 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
150 {
151 enum bpf_obj_type type;
152 int fd;
153
154 fd = open_obj_pinned(path);
155 if (fd < 0)
156 return -1;
157
158 type = get_fd_type(fd);
159 if (type < 0) {
160 close(fd);
161 return type;
162 }
163 if (type != exp_type) {
164 p_err("incorrect object type: %s", get_fd_type_name(type));
165 close(fd);
166 return -1;
167 }
168
169 return fd;
170 }
171
do_pin_fd(int fd,const char * name)172 int do_pin_fd(int fd, const char *name)
173 {
174 char err_str[ERR_MAX_LEN];
175 char *file;
176 char *dir;
177 int err = 0;
178
179 err = bpf_obj_pin(fd, name);
180 if (!err)
181 goto out;
182
183 file = malloc(strlen(name) + 1);
184 strcpy(file, name);
185 dir = dirname(file);
186
187 if (errno != EPERM || is_bpffs(dir)) {
188 p_err("can't pin the object (%s): %s", name, strerror(errno));
189 goto out_free;
190 }
191
192 /* Attempt to mount bpffs, then retry pinning. */
193 err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
194 if (!err) {
195 err = bpf_obj_pin(fd, name);
196 if (err)
197 p_err("can't pin the object (%s): %s", name,
198 strerror(errno));
199 } else {
200 err_str[ERR_MAX_LEN - 1] = '\0';
201 p_err("can't mount BPF file system to pin the object (%s): %s",
202 name, err_str);
203 }
204
205 out_free:
206 free(file);
207 out:
208 return err;
209 }
210
do_pin_any(int argc,char ** argv,int (* get_fd_by_id)(__u32))211 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
212 {
213 unsigned int id;
214 char *endptr;
215 int err;
216 int fd;
217
218 if (argc < 3) {
219 p_err("too few arguments, id ID and FILE path is required");
220 return -1;
221 } else if (argc > 3) {
222 p_err("too many arguments");
223 return -1;
224 }
225
226 if (!is_prefix(*argv, "id")) {
227 p_err("expected 'id' got %s", *argv);
228 return -1;
229 }
230 NEXT_ARG();
231
232 id = strtoul(*argv, &endptr, 0);
233 if (*endptr) {
234 p_err("can't parse %s as ID", *argv);
235 return -1;
236 }
237 NEXT_ARG();
238
239 fd = get_fd_by_id(id);
240 if (fd < 0) {
241 p_err("can't get prog by id (%u): %s", id, strerror(errno));
242 return -1;
243 }
244
245 err = do_pin_fd(fd, *argv);
246
247 close(fd);
248 return err;
249 }
250
get_fd_type_name(enum bpf_obj_type type)251 const char *get_fd_type_name(enum bpf_obj_type type)
252 {
253 static const char * const names[] = {
254 [BPF_OBJ_UNKNOWN] = "unknown",
255 [BPF_OBJ_PROG] = "prog",
256 [BPF_OBJ_MAP] = "map",
257 };
258
259 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
260 return names[BPF_OBJ_UNKNOWN];
261
262 return names[type];
263 }
264
get_fd_type(int fd)265 int get_fd_type(int fd)
266 {
267 char path[PATH_MAX];
268 char buf[512];
269 ssize_t n;
270
271 snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);
272
273 n = readlink(path, buf, sizeof(buf));
274 if (n < 0) {
275 p_err("can't read link type: %s", strerror(errno));
276 return -1;
277 }
278 if (n == sizeof(path)) {
279 p_err("can't read link type: path too long!");
280 return -1;
281 }
282
283 if (strstr(buf, "bpf-map"))
284 return BPF_OBJ_MAP;
285 else if (strstr(buf, "bpf-prog"))
286 return BPF_OBJ_PROG;
287
288 return BPF_OBJ_UNKNOWN;
289 }
290
get_fdinfo(int fd,const char * key)291 char *get_fdinfo(int fd, const char *key)
292 {
293 char path[PATH_MAX];
294 char *line = NULL;
295 size_t line_n = 0;
296 ssize_t n;
297 FILE *fdi;
298
299 snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd);
300
301 fdi = fopen(path, "r");
302 if (!fdi) {
303 p_err("can't open fdinfo: %s", strerror(errno));
304 return NULL;
305 }
306
307 while ((n = getline(&line, &line_n, fdi))) {
308 char *value;
309 int len;
310
311 if (!strstr(line, key))
312 continue;
313
314 fclose(fdi);
315
316 value = strchr(line, '\t');
317 if (!value || !value[1]) {
318 p_err("malformed fdinfo!?");
319 free(line);
320 return NULL;
321 }
322 value++;
323
324 len = strlen(value);
325 memmove(line, value, len);
326 line[len - 1] = '\0';
327
328 return line;
329 }
330
331 p_err("key '%s' not found in fdinfo", key);
332 free(line);
333 fclose(fdi);
334 return NULL;
335 }
336
print_data_json(uint8_t * data,size_t len)337 void print_data_json(uint8_t *data, size_t len)
338 {
339 unsigned int i;
340
341 jsonw_start_array(json_wtr);
342 for (i = 0; i < len; i++)
343 jsonw_printf(json_wtr, "%d", data[i]);
344 jsonw_end_array(json_wtr);
345 }
346
print_hex_data_json(uint8_t * data,size_t len)347 void print_hex_data_json(uint8_t *data, size_t len)
348 {
349 unsigned int i;
350
351 jsonw_start_array(json_wtr);
352 for (i = 0; i < len; i++)
353 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
354 jsonw_end_array(json_wtr);
355 }
356
build_pinned_obj_table(struct pinned_obj_table * tab,enum bpf_obj_type type)357 int build_pinned_obj_table(struct pinned_obj_table *tab,
358 enum bpf_obj_type type)
359 {
360 struct bpf_prog_info pinned_info = {};
361 struct pinned_obj *obj_node = NULL;
362 __u32 len = sizeof(pinned_info);
363 struct mntent *mntent = NULL;
364 enum bpf_obj_type objtype;
365 FILE *mntfile = NULL;
366 FTSENT *ftse = NULL;
367 FTS *fts = NULL;
368 int fd, err;
369
370 mntfile = setmntent("/proc/mounts", "r");
371 if (!mntfile)
372 return -1;
373
374 while ((mntent = getmntent(mntfile))) {
375 char *path[] = { mntent->mnt_dir, NULL };
376
377 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
378 continue;
379
380 fts = fts_open(path, 0, NULL);
381 if (!fts)
382 continue;
383
384 while ((ftse = fts_read(fts))) {
385 if (!(ftse->fts_info & FTS_F))
386 continue;
387 fd = open_obj_pinned(ftse->fts_path);
388 if (fd < 0)
389 continue;
390
391 objtype = get_fd_type(fd);
392 if (objtype != type) {
393 close(fd);
394 continue;
395 }
396 memset(&pinned_info, 0, sizeof(pinned_info));
397 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
398 if (err) {
399 close(fd);
400 continue;
401 }
402
403 obj_node = malloc(sizeof(*obj_node));
404 if (!obj_node) {
405 close(fd);
406 fts_close(fts);
407 fclose(mntfile);
408 return -1;
409 }
410
411 memset(obj_node, 0, sizeof(*obj_node));
412 obj_node->id = pinned_info.id;
413 obj_node->path = strdup(ftse->fts_path);
414 hash_add(tab->table, &obj_node->hash, obj_node->id);
415
416 close(fd);
417 }
418 fts_close(fts);
419 }
420 fclose(mntfile);
421 return 0;
422 }
423
delete_pinned_obj_table(struct pinned_obj_table * tab)424 void delete_pinned_obj_table(struct pinned_obj_table *tab)
425 {
426 struct pinned_obj *obj;
427 struct hlist_node *tmp;
428 unsigned int bkt;
429
430 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
431 hash_del(&obj->hash);
432 free(obj->path);
433 free(obj);
434 }
435 }
436
get_page_size(void)437 unsigned int get_page_size(void)
438 {
439 static int result;
440
441 if (!result)
442 result = getpagesize();
443 return result;
444 }
445
get_possible_cpus(void)446 unsigned int get_possible_cpus(void)
447 {
448 static unsigned int result;
449 char buf[128];
450 long int n;
451 char *ptr;
452 int fd;
453
454 if (result)
455 return result;
456
457 fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
458 if (fd < 0) {
459 p_err("can't open sysfs possible cpus");
460 exit(-1);
461 }
462
463 n = read(fd, buf, sizeof(buf));
464 if (n < 2) {
465 p_err("can't read sysfs possible cpus");
466 exit(-1);
467 }
468 close(fd);
469
470 if (n == sizeof(buf)) {
471 p_err("read sysfs possible cpus overflow");
472 exit(-1);
473 }
474
475 ptr = buf;
476 n = 0;
477 while (*ptr && *ptr != '\n') {
478 unsigned int a, b;
479
480 if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
481 n += b - a + 1;
482
483 ptr = strchr(ptr, '-') + 1;
484 } else if (sscanf(ptr, "%u", &a) == 1) {
485 n++;
486 } else {
487 assert(0);
488 }
489
490 while (isdigit(*ptr))
491 ptr++;
492 if (*ptr == ',')
493 ptr++;
494 }
495
496 result = n;
497
498 return result;
499 }
500
501 static char *
ifindex_to_name_ns(__u32 ifindex,__u32 ns_dev,__u32 ns_ino,char * buf)502 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
503 {
504 struct stat st;
505 int err;
506
507 err = stat("/proc/self/ns/net", &st);
508 if (err) {
509 p_err("Can't stat /proc/self: %s", strerror(errno));
510 return NULL;
511 }
512
513 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
514 return NULL;
515
516 return if_indextoname(ifindex, buf);
517 }
518
read_sysfs_hex_int(char * path)519 static int read_sysfs_hex_int(char *path)
520 {
521 char vendor_id_buf[8];
522 int len;
523 int fd;
524
525 fd = open(path, O_RDONLY);
526 if (fd < 0) {
527 p_err("Can't open %s: %s", path, strerror(errno));
528 return -1;
529 }
530
531 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
532 close(fd);
533 if (len < 0) {
534 p_err("Can't read %s: %s", path, strerror(errno));
535 return -1;
536 }
537 if (len >= (int)sizeof(vendor_id_buf)) {
538 p_err("Value in %s too long", path);
539 return -1;
540 }
541
542 vendor_id_buf[len] = 0;
543
544 return strtol(vendor_id_buf, NULL, 0);
545 }
546
read_sysfs_netdev_hex_int(char * devname,const char * entry_name)547 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
548 {
549 char full_path[64];
550
551 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
552 devname, entry_name);
553
554 return read_sysfs_hex_int(full_path);
555 }
556
ifindex_to_bfd_name_ns(__u32 ifindex,__u64 ns_dev,__u64 ns_ino)557 const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino)
558 {
559 char devname[IF_NAMESIZE];
560 int vendor_id;
561 int device_id;
562
563 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
564 p_err("Can't get net device name for ifindex %d: %s", ifindex,
565 strerror(errno));
566 return NULL;
567 }
568
569 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
570 if (vendor_id < 0) {
571 p_err("Can't get device vendor id for %s", devname);
572 return NULL;
573 }
574
575 switch (vendor_id) {
576 case 0x19ee:
577 device_id = read_sysfs_netdev_hex_int(devname, "device");
578 if (device_id != 0x4000 &&
579 device_id != 0x6000 &&
580 device_id != 0x6003)
581 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
582 return "NFP-6xxx";
583 default:
584 p_err("Can't get bfd arch name for device vendor id 0x%04x",
585 vendor_id);
586 return NULL;
587 }
588 }
589
print_dev_plain(__u32 ifindex,__u64 ns_dev,__u64 ns_inode)590 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
591 {
592 char name[IF_NAMESIZE];
593
594 if (!ifindex)
595 return;
596
597 printf(" dev ");
598 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
599 printf("%s", name);
600 else
601 printf("ifindex %u ns_dev %llu ns_ino %llu",
602 ifindex, ns_dev, ns_inode);
603 }
604
print_dev_json(__u32 ifindex,__u64 ns_dev,__u64 ns_inode)605 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
606 {
607 char name[IF_NAMESIZE];
608
609 if (!ifindex)
610 return;
611
612 jsonw_name(json_wtr, "dev");
613 jsonw_start_object(json_wtr);
614 jsonw_uint_field(json_wtr, "ifindex", ifindex);
615 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
616 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
617 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
618 jsonw_string_field(json_wtr, "ifname", name);
619 jsonw_end_object(json_wtr);
620 }
621
