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TOMOYO Linux Cross Reference
Linux/tools/bpf/bpftool/common.c

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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 #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 
 25 #include "main.h"
 26 
 27 #ifndef BPF_FS_MAGIC
 28 #define BPF_FS_MAGIC            0xcafe4a11
 29 #endif
 30 
 31 void __printf(1, 2) p_err(const char *fmt, ...)
 32 {
 33         va_list ap;
 34 
 35         va_start(ap, fmt);
 36         if (json_output) {
 37                 jsonw_start_object(json_wtr);
 38                 jsonw_name(json_wtr, "error");
 39                 jsonw_vprintf_enquote(json_wtr, fmt, ap);
 40                 jsonw_end_object(json_wtr);
 41         } else {
 42                 fprintf(stderr, "Error: ");
 43                 vfprintf(stderr, fmt, ap);
 44                 fprintf(stderr, "\n");
 45         }
 46         va_end(ap);
 47 }
 48 
 49 void __printf(1, 2) p_info(const char *fmt, ...)
 50 {
 51         va_list ap;
 52 
 53         if (json_output)
 54                 return;
 55 
 56         va_start(ap, fmt);
 57         vfprintf(stderr, fmt, ap);
 58         fprintf(stderr, "\n");
 59         va_end(ap);
 60 }
 61 
 62 static bool is_bpffs(char *path)
 63 {
 64         struct statfs st_fs;
 65 
 66         if (statfs(path, &st_fs) < 0)
 67                 return false;
 68 
 69         return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
 70 }
 71 
 72 void set_max_rlimit(void)
 73 {
 74         struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
 75 
 76         setrlimit(RLIMIT_MEMLOCK, &rinf);
 77 }
 78 
 79 static int
 80 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
 81 {
 82         bool bind_done = false;
 83 
 84         while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
 85                 if (errno != EINVAL || bind_done) {
 86                         snprintf(buff, bufflen,
 87                                  "mount --make-private %s failed: %s",
 88                                  target, strerror(errno));
 89                         return -1;
 90                 }
 91 
 92                 if (mount(target, target, "none", MS_BIND, NULL)) {
 93                         snprintf(buff, bufflen,
 94                                  "mount --bind %s %s failed: %s",
 95                                  target, target, strerror(errno));
 96                         return -1;
 97                 }
 98 
 99                 bind_done = true;
100         }
101 
102         if (mount(type, target, type, 0, "mode=0700")) {
103                 snprintf(buff, bufflen, "mount -t %s %s %s failed: %s",
104                          type, type, target, strerror(errno));
105                 return -1;
106         }
107 
108         return 0;
109 }
110 
111 int mount_tracefs(const char *target)
112 {
113         char err_str[ERR_MAX_LEN];
114         int err;
115 
116         err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
117         if (err) {
118                 err_str[ERR_MAX_LEN - 1] = '\0';
119                 p_err("can't mount tracefs: %s", err_str);
120         }
121 
122         return err;
123 }
124 
125 int open_obj_pinned(char *path, bool quiet)
126 {
127         int fd;
128 
129         fd = bpf_obj_get(path);
130         if (fd < 0) {
131                 if (!quiet)
132                         p_err("bpf obj get (%s): %s", path,
133                               errno == EACCES && !is_bpffs(dirname(path)) ?
134                             "directory not in bpf file system (bpffs)" :
135                             strerror(errno));
136                 return -1;
137         }
138 
139         return fd;
140 }
141 
142 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
143 {
144         enum bpf_obj_type type;
145         int fd;
146 
147         fd = open_obj_pinned(path, false);
148         if (fd < 0)
149                 return -1;
150 
151         type = get_fd_type(fd);
152         if (type < 0) {
153                 close(fd);
154                 return type;
155         }
156         if (type != exp_type) {
157                 p_err("incorrect object type: %s", get_fd_type_name(type));
158                 close(fd);
159                 return -1;
160         }
161 
162         return fd;
163 }
164 
165 int mount_bpffs_for_pin(const char *name)
166 {
167         char err_str[ERR_MAX_LEN];
168         char *file;
169         char *dir;
170         int err = 0;
171 
172         file = malloc(strlen(name) + 1);
173         strcpy(file, name);
174         dir = dirname(file);
175 
176         if (is_bpffs(dir))
177                 /* nothing to do if already mounted */
178                 goto out_free;
179 
180         if (block_mount) {
181                 p_err("no BPF file system found, not mounting it due to --nomount option");
182                 err = -1;
183                 goto out_free;
184         }
185 
186         err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
187         if (err) {
188                 err_str[ERR_MAX_LEN - 1] = '\0';
189                 p_err("can't mount BPF file system to pin the object (%s): %s",
190                       name, err_str);
191         }
192 
193 out_free:
194         free(file);
195         return err;
196 }
197 
198 int do_pin_fd(int fd, const char *name)
199 {
200         int err;
201 
202         err = mount_bpffs_for_pin(name);
203         if (err)
204                 return err;
205 
206         return bpf_obj_pin(fd, name);
207 }
208 
209 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
210 {
211         unsigned int id;
212         char *endptr;
213         int err;
214         int fd;
215 
216         if (argc < 3) {
217                 p_err("too few arguments, id ID and FILE path is required");
218                 return -1;
219         } else if (argc > 3) {
220                 p_err("too many arguments");
221                 return -1;
222         }
223 
224         if (!is_prefix(*argv, "id")) {
225                 p_err("expected 'id' got %s", *argv);
226                 return -1;
227         }
228         NEXT_ARG();
229 
230         id = strtoul(*argv, &endptr, 0);
231         if (*endptr) {
232                 p_err("can't parse %s as ID", *argv);
233                 return -1;
234         }
235         NEXT_ARG();
236 
237         fd = get_fd_by_id(id);
238         if (fd < 0) {
239                 p_err("can't get prog by id (%u): %s", id, strerror(errno));
240                 return -1;
241         }
242 
243         err = do_pin_fd(fd, *argv);
244 
245         close(fd);
246         return err;
247 }
248 
249 const char *get_fd_type_name(enum bpf_obj_type type)
250 {
251         static const char * const names[] = {
252                 [BPF_OBJ_UNKNOWN]       = "unknown",
253                 [BPF_OBJ_PROG]          = "prog",
254                 [BPF_OBJ_MAP]           = "map",
255         };
256 
257         if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
258                 return names[BPF_OBJ_UNKNOWN];
259 
260         return names[type];
261 }
262 
263 int get_fd_type(int fd)
264 {
265         char path[PATH_MAX];
266         char buf[512];
267         ssize_t n;
268 
269         snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
270 
271         n = readlink(path, buf, sizeof(buf));
272         if (n < 0) {
273                 p_err("can't read link type: %s", strerror(errno));
274                 return -1;
275         }
276         if (n == sizeof(path)) {
277                 p_err("can't read link type: path too long!");
278                 return -1;
279         }
280 
281         if (strstr(buf, "bpf-map"))
282                 return BPF_OBJ_MAP;
283         else if (strstr(buf, "bpf-prog"))
284                 return BPF_OBJ_PROG;
285 
286         return BPF_OBJ_UNKNOWN;
287 }
288 
289 char *get_fdinfo(int fd, const char *key)
290 {
291         char path[PATH_MAX];
292         char *line = NULL;
293         size_t line_n = 0;
294         ssize_t n;
295         FILE *fdi;
296 
297         snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
298 
299         fdi = fopen(path, "r");
300         if (!fdi)
301                 return NULL;
302 
303         while ((n = getline(&line, &line_n, fdi)) > 0) {
304                 char *value;
305                 int len;
306 
307                 if (!strstr(line, key))
308                         continue;
309 
310                 fclose(fdi);
311 
312                 value = strchr(line, '\t');
313                 if (!value || !value[1]) {
314                         free(line);
315                         return NULL;
316                 }
317                 value++;
318 
319                 len = strlen(value);
320                 memmove(line, value, len);
321                 line[len - 1] = '\0';
322 
323                 return line;
324         }
325 
326         free(line);
327         fclose(fdi);
328         return NULL;
329 }
330 
331 void print_data_json(uint8_t *data, size_t len)
332 {
333         unsigned int i;
334 
335         jsonw_start_array(json_wtr);
336         for (i = 0; i < len; i++)
337                 jsonw_printf(json_wtr, "%d", data[i]);
338         jsonw_end_array(json_wtr);
339 }
340 
341 void print_hex_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, "\"0x%02hhx\"", data[i]);
348         jsonw_end_array(json_wtr);
349 }
350 
351 int build_pinned_obj_table(struct pinned_obj_table *tab,
352                            enum bpf_obj_type type)
353 {
354         struct bpf_prog_info pinned_info = {};
355         struct pinned_obj *obj_node = NULL;
356         __u32 len = sizeof(pinned_info);
357         struct mntent *mntent = NULL;
358         enum bpf_obj_type objtype;
359         FILE *mntfile = NULL;
360         FTSENT *ftse = NULL;
361         FTS *fts = NULL;
362         int fd, err;
363 
364         mntfile = setmntent("/proc/mounts", "r");
365         if (!mntfile)
366                 return -1;
367 
368         while ((mntent = getmntent(mntfile))) {
369                 char *path[] = { mntent->mnt_dir, NULL };
370 
371                 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
372                         continue;
373 
374                 fts = fts_open(path, 0, NULL);
375                 if (!fts)
376                         continue;
377 
378                 while ((ftse = fts_read(fts))) {
379                         if (!(ftse->fts_info & FTS_F))
380                                 continue;
381                         fd = open_obj_pinned(ftse->fts_path, true);
382                         if (fd < 0)
383                                 continue;
384 
385                         objtype = get_fd_type(fd);
386                         if (objtype != type) {
387                                 close(fd);
388                                 continue;
389                         }
390                         memset(&pinned_info, 0, sizeof(pinned_info));
391                         err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
392                         if (err) {
393                                 close(fd);
394                                 continue;
395                         }
396 
397                         obj_node = malloc(sizeof(*obj_node));
398                         if (!obj_node) {
399                                 close(fd);
400                                 fts_close(fts);
401                                 fclose(mntfile);
402                                 return -1;
403                         }
404 
405                         memset(obj_node, 0, sizeof(*obj_node));
406                         obj_node->id = pinned_info.id;
407                         obj_node->path = strdup(ftse->fts_path);
408                         hash_add(tab->table, &obj_node->hash, obj_node->id);
409 
410                         close(fd);
411                 }
412                 fts_close(fts);
413         }
414         fclose(mntfile);
415         return 0;
416 }
417 
418 void delete_pinned_obj_table(struct pinned_obj_table *tab)
419 {
420         struct pinned_obj *obj;
421         struct hlist_node *tmp;
422         unsigned int bkt;
423 
424         hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
425                 hash_del(&obj->hash);
426                 free(obj->path);
427                 free(obj);
428         }
429 }
430 
431 unsigned int get_page_size(void)
432 {
433         static int result;
434 
435         if (!result)
436                 result = getpagesize();
437         return result;
438 }
439 
440 unsigned int get_possible_cpus(void)
441 {
442         static unsigned int result;
443         char buf[128];
444         long int n;
445         char *ptr;
446         int fd;
447 
448         if (result)
449                 return result;
450 
451         fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
452         if (fd < 0) {
453                 p_err("can't open sysfs possible cpus");
454                 exit(-1);
455         }
456 
457         n = read(fd, buf, sizeof(buf));
458         if (n < 2) {
459                 p_err("can't read sysfs possible cpus");
460                 exit(-1);
461         }
462         close(fd);
463 
464         if (n == sizeof(buf)) {
465                 p_err("read sysfs possible cpus overflow");
466                 exit(-1);
467         }
468 
469         ptr = buf;
470         n = 0;
471         while (*ptr && *ptr != '\n') {
472                 unsigned int a, b;
473 
474                 if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
475                         n += b - a + 1;
476 
477                         ptr = strchr(ptr, '-') + 1;
478                 } else if (sscanf(ptr, "%u", &a) == 1) {
479                         n++;
480                 } else {
481                         assert(0);
482                 }
483 
484                 while (isdigit(*ptr))
485                         ptr++;
486                 if (*ptr == ',')
487                         ptr++;
488         }
489 
490         result = n;
491 
492         return result;
493 }
494 
495 static char *
496 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
497 {
498         struct stat st;
499         int err;
500 
501         err = stat("/proc/self/ns/net", &st);
502         if (err) {
503                 p_err("Can't stat /proc/self: %s", strerror(errno));
504                 return NULL;
505         }
506 
507         if (st.st_dev != ns_dev || st.st_ino != ns_ino)
508                 return NULL;
509 
510         return if_indextoname(ifindex, buf);
511 }
512 
513 static int read_sysfs_hex_int(char *path)
514 {
515         char vendor_id_buf[8];
516         int len;
517         int fd;
518 
519         fd = open(path, O_RDONLY);
520         if (fd < 0) {
521                 p_err("Can't open %s: %s", path, strerror(errno));
522                 return -1;
523         }
524 
525         len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
526         close(fd);
527         if (len < 0) {
528                 p_err("Can't read %s: %s", path, strerror(errno));
529                 return -1;
530         }
531         if (len >= (int)sizeof(vendor_id_buf)) {
532                 p_err("Value in %s too long", path);
533                 return -1;
534         }
535 
536         vendor_id_buf[len] = 0;
537 
538         return strtol(vendor_id_buf, NULL, 0);
539 }
540 
541 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
542 {
543         char full_path[64];
544 
545         snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
546                  devname, entry_name);
547 
548         return read_sysfs_hex_int(full_path);
549 }
550 
551 const char *
552 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
553                       const char **opt)
554 {
555         char devname[IF_NAMESIZE];
556         int vendor_id;
557         int device_id;
558 
559         if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
560                 p_err("Can't get net device name for ifindex %d: %s", ifindex,
561                       strerror(errno));
562                 return NULL;
563         }
564 
565         vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
566         if (vendor_id < 0) {
567                 p_err("Can't get device vendor id for %s", devname);
568                 return NULL;
569         }
570 
571         switch (vendor_id) {
572         case 0x19ee:
573                 device_id = read_sysfs_netdev_hex_int(devname, "device");
574                 if (device_id != 0x4000 &&
575                     device_id != 0x6000 &&
576                     device_id != 0x6003)
577                         p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
578                 *opt = "ctx4";
579                 return "NFP-6xxx";
580         default:
581                 p_err("Can't get bfd arch name for device vendor id 0x%04x",
582                       vendor_id);
583                 return NULL;
584         }
585 }
586 
587 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
588 {
589         char name[IF_NAMESIZE];
590 
591         if (!ifindex)
592                 return;
593 
594         printf("  offloaded_to ");
595         if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
596                 printf("%s", name);
597         else
598                 printf("ifindex %u ns_dev %llu ns_ino %llu",
599                        ifindex, ns_dev, ns_inode);
600 }
601 
602 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
603 {
604         char name[IF_NAMESIZE];
605 
606         if (!ifindex)
607                 return;
608 
609         jsonw_name(json_wtr, "dev");
610         jsonw_start_object(json_wtr);
611         jsonw_uint_field(json_wtr, "ifindex", ifindex);
612         jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
613         jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
614         if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
615                 jsonw_string_field(json_wtr, "ifname", name);
616         jsonw_end_object(json_wtr);
617 }
618 
619 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
620 {
621         char *endptr;
622 
623         NEXT_ARGP();
624 
625         if (*val) {
626                 p_err("%s already specified", what);
627                 return -1;
628         }
629 
630         *val = strtoul(**argv, &endptr, 0);
631         if (*endptr) {
632                 p_err("can't parse %s as %s", **argv, what);
633                 return -1;
634         }
635         NEXT_ARGP();
636 
637         return 0;
638 }
639 

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