1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
15 #include <linux/limits.h>
16 #include <linux/magic.h>
18 #include <sys/mount.h>
19 #include <sys/resource.h>
24 #include <libbpf.h> /* libbpf_num_possible_cpus */
29 #define BPF_FS_MAGIC 0xcafe4a11
32 void __printf(1, 2) p_err(const char *fmt, ...)
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);
43 fprintf(stderr, "Error: ");
44 vfprintf(stderr, fmt, ap);
45 fprintf(stderr, "\n");
50 void __printf(1, 2) p_info(const char *fmt, ...)
58 vfprintf(stderr, fmt, ap);
59 fprintf(stderr, "\n");
63 static bool is_bpffs(char *path)
67 if (statfs(path, &st_fs) < 0)
70 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
73 void set_max_rlimit(void)
75 struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
77 setrlimit(RLIMIT_MEMLOCK, &rinf);
81 mnt_fs(const char *target, const char *type, char *buff, size_t bufflen)
83 bool bind_done = false;
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));
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));
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));
112 int mount_tracefs(const char *target)
114 char err_str[ERR_MAX_LEN];
117 err = mnt_fs(target, "tracefs", err_str, ERR_MAX_LEN);
119 err_str[ERR_MAX_LEN - 1] = '\0';
120 p_err("can't mount tracefs: %s", err_str);
126 int open_obj_pinned(char *path, bool quiet)
130 fd = bpf_obj_get(path);
133 p_err("bpf obj get (%s): %s", path,
134 errno == EACCES && !is_bpffs(dirname(path)) ?
135 "directory not in bpf file system (bpffs)" :
143 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
145 enum bpf_obj_type type;
148 fd = open_obj_pinned(path, false);
152 type = get_fd_type(fd);
157 if (type != exp_type) {
158 p_err("incorrect object type: %s", get_fd_type_name(type));
166 int mount_bpffs_for_pin(const char *name)
168 char err_str[ERR_MAX_LEN];
173 file = malloc(strlen(name) + 1);
178 /* nothing to do if already mounted */
182 p_err("no BPF file system found, not mounting it due to --nomount option");
187 err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN);
189 err_str[ERR_MAX_LEN - 1] = '\0';
190 p_err("can't mount BPF file system to pin the object (%s): %s",
199 int do_pin_fd(int fd, const char *name)
203 err = mount_bpffs_for_pin(name);
207 return bpf_obj_pin(fd, name);
210 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
218 p_err("too few arguments, id ID and FILE path is required");
220 } else if (argc > 3) {
221 p_err("too many arguments");
225 if (!is_prefix(*argv, "id")) {
226 p_err("expected 'id' got %s", *argv);
231 id = strtoul(*argv, &endptr, 0);
233 p_err("can't parse %s as ID", *argv);
238 fd = get_fd_by_id(id);
240 p_err("can't get prog by id (%u): %s", id, strerror(errno));
244 err = do_pin_fd(fd, *argv);
250 const char *get_fd_type_name(enum bpf_obj_type type)
252 static const char * const names[] = {
253 [BPF_OBJ_UNKNOWN] = "unknown",
254 [BPF_OBJ_PROG] = "prog",
255 [BPF_OBJ_MAP] = "map",
258 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
259 return names[BPF_OBJ_UNKNOWN];
264 int get_fd_type(int fd)
270 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
272 n = readlink(path, buf, sizeof(buf));
274 p_err("can't read link type: %s", strerror(errno));
277 if (n == sizeof(path)) {
278 p_err("can't read link type: path too long!");
282 if (strstr(buf, "bpf-map"))
284 else if (strstr(buf, "bpf-prog"))
287 return BPF_OBJ_UNKNOWN;
290 char *get_fdinfo(int fd, const char *key)
298 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
300 fdi = fopen(path, "r");
304 while ((n = getline(&line, &line_n, fdi)) > 0) {
308 if (!strstr(line, key))
313 value = strchr(line, '\t');
314 if (!value || !value[1]) {
321 memmove(line, value, len);
322 line[len - 1] = '\0';
332 void print_data_json(uint8_t *data, size_t len)
336 jsonw_start_array(json_wtr);
337 for (i = 0; i < len; i++)
338 jsonw_printf(json_wtr, "%d", data[i]);
339 jsonw_end_array(json_wtr);
342 void print_hex_data_json(uint8_t *data, size_t len)
346 jsonw_start_array(json_wtr);
347 for (i = 0; i < len; i++)
348 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
349 jsonw_end_array(json_wtr);
352 int build_pinned_obj_table(struct pinned_obj_table *tab,
353 enum bpf_obj_type type)
355 struct bpf_prog_info pinned_info = {};
356 struct pinned_obj *obj_node = NULL;
357 __u32 len = sizeof(pinned_info);
358 struct mntent *mntent = NULL;
359 enum bpf_obj_type objtype;
360 FILE *mntfile = NULL;
365 mntfile = setmntent("/proc/mounts", "r");
369 while ((mntent = getmntent(mntfile))) {
370 char *path[] = { mntent->mnt_dir, NULL };
372 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
375 fts = fts_open(path, 0, NULL);
379 while ((ftse = fts_read(fts))) {
380 if (!(ftse->fts_info & FTS_F))
382 fd = open_obj_pinned(ftse->fts_path, true);
386 objtype = get_fd_type(fd);
387 if (objtype != type) {
391 memset(&pinned_info, 0, sizeof(pinned_info));
392 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
398 obj_node = malloc(sizeof(*obj_node));
406 memset(obj_node, 0, sizeof(*obj_node));
407 obj_node->id = pinned_info.id;
408 obj_node->path = strdup(ftse->fts_path);
409 hash_add(tab->table, &obj_node->hash, obj_node->id);
419 void delete_pinned_obj_table(struct pinned_obj_table *tab)
421 struct pinned_obj *obj;
422 struct hlist_node *tmp;
425 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
426 hash_del(&obj->hash);
432 unsigned int get_page_size(void)
437 result = getpagesize();
441 unsigned int get_possible_cpus(void)
443 int cpus = libbpf_num_possible_cpus();
446 p_err("Can't get # of possible cpus: %s", strerror(-cpus));
453 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
458 err = stat("/proc/self/ns/net", &st);
460 p_err("Can't stat /proc/self: %s", strerror(errno));
464 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
467 return if_indextoname(ifindex, buf);
470 static int read_sysfs_hex_int(char *path)
472 char vendor_id_buf[8];
476 fd = open(path, O_RDONLY);
478 p_err("Can't open %s: %s", path, strerror(errno));
482 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
485 p_err("Can't read %s: %s", path, strerror(errno));
488 if (len >= (int)sizeof(vendor_id_buf)) {
489 p_err("Value in %s too long", path);
493 vendor_id_buf[len] = 0;
495 return strtol(vendor_id_buf, NULL, 0);
498 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
502 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
503 devname, entry_name);
505 return read_sysfs_hex_int(full_path);
509 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
512 char devname[IF_NAMESIZE];
516 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
517 p_err("Can't get net device name for ifindex %d: %s", ifindex,
522 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
524 p_err("Can't get device vendor id for %s", devname);
530 device_id = read_sysfs_netdev_hex_int(devname, "device");
531 if (device_id != 0x4000 &&
532 device_id != 0x6000 &&
534 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
538 p_err("Can't get bfd arch name for device vendor id 0x%04x",
544 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
546 char name[IF_NAMESIZE];
551 printf(" offloaded_to ");
552 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
555 printf("ifindex %u ns_dev %llu ns_ino %llu",
556 ifindex, ns_dev, ns_inode);
559 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
561 char name[IF_NAMESIZE];
566 jsonw_name(json_wtr, "dev");
567 jsonw_start_object(json_wtr);
568 jsonw_uint_field(json_wtr, "ifindex", ifindex);
569 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
570 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
571 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
572 jsonw_string_field(json_wtr, "ifname", name);
573 jsonw_end_object(json_wtr);
576 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
583 p_err("%s already specified", what);
587 *val = strtoul(**argv, &endptr, 0);
589 p_err("can't parse %s as %s", **argv, what);