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 <bpf/libbpf.h> /* libbpf_num_possible_cpus */
29 #define BPF_FS_MAGIC 0xcafe4a11
32 void 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 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 err = bpf_obj_pin(fd, name);
209 p_err("can't pin the object (%s): %s", name, strerror(errno));
214 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
222 p_err("too few arguments, id ID and FILE path is required");
224 } else if (argc > 3) {
225 p_err("too many arguments");
229 if (!is_prefix(*argv, "id")) {
230 p_err("expected 'id' got %s", *argv);
235 id = strtoul(*argv, &endptr, 0);
237 p_err("can't parse %s as ID", *argv);
242 fd = get_fd_by_id(id);
244 p_err("can't open object by id (%u): %s", id, strerror(errno));
248 err = do_pin_fd(fd, *argv);
254 const char *get_fd_type_name(enum bpf_obj_type type)
256 static const char * const names[] = {
257 [BPF_OBJ_UNKNOWN] = "unknown",
258 [BPF_OBJ_PROG] = "prog",
259 [BPF_OBJ_MAP] = "map",
262 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
263 return names[BPF_OBJ_UNKNOWN];
268 int get_fd_type(int fd)
274 snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
276 n = readlink(path, buf, sizeof(buf));
278 p_err("can't read link type: %s", strerror(errno));
281 if (n == sizeof(path)) {
282 p_err("can't read link type: path too long!");
286 if (strstr(buf, "bpf-map"))
288 else if (strstr(buf, "bpf-prog"))
291 return BPF_OBJ_UNKNOWN;
294 char *get_fdinfo(int fd, const char *key)
302 snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
304 fdi = fopen(path, "r");
308 while ((n = getline(&line, &line_n, fdi)) > 0) {
312 if (!strstr(line, key))
317 value = strchr(line, '\t');
318 if (!value || !value[1]) {
325 memmove(line, value, len);
326 line[len - 1] = '\0';
336 void print_data_json(uint8_t *data, size_t len)
340 jsonw_start_array(json_wtr);
341 for (i = 0; i < len; i++)
342 jsonw_printf(json_wtr, "%d", data[i]);
343 jsonw_end_array(json_wtr);
346 void print_hex_data_json(uint8_t *data, size_t len)
350 jsonw_start_array(json_wtr);
351 for (i = 0; i < len; i++)
352 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
353 jsonw_end_array(json_wtr);
356 int build_pinned_obj_table(struct pinned_obj_table *tab,
357 enum bpf_obj_type type)
359 struct bpf_prog_info pinned_info = {};
360 struct pinned_obj *obj_node = NULL;
361 __u32 len = sizeof(pinned_info);
362 struct mntent *mntent = NULL;
363 enum bpf_obj_type objtype;
364 FILE *mntfile = NULL;
369 mntfile = setmntent("/proc/mounts", "r");
373 while ((mntent = getmntent(mntfile))) {
374 char *path[] = { mntent->mnt_dir, NULL };
376 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
379 fts = fts_open(path, 0, NULL);
383 while ((ftse = fts_read(fts))) {
384 if (!(ftse->fts_info & FTS_F))
386 fd = open_obj_pinned(ftse->fts_path, true);
390 objtype = get_fd_type(fd);
391 if (objtype != type) {
395 memset(&pinned_info, 0, sizeof(pinned_info));
396 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
402 obj_node = malloc(sizeof(*obj_node));
410 memset(obj_node, 0, sizeof(*obj_node));
411 obj_node->id = pinned_info.id;
412 obj_node->path = strdup(ftse->fts_path);
413 hash_add(tab->table, &obj_node->hash, obj_node->id);
423 void delete_pinned_obj_table(struct pinned_obj_table *tab)
425 struct pinned_obj *obj;
426 struct hlist_node *tmp;
429 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
430 hash_del(&obj->hash);
436 unsigned int get_page_size(void)
441 result = getpagesize();
445 unsigned int get_possible_cpus(void)
447 int cpus = libbpf_num_possible_cpus();
450 p_err("Can't get # of possible cpus: %s", strerror(-cpus));
457 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
462 err = stat("/proc/self/ns/net", &st);
464 p_err("Can't stat /proc/self: %s", strerror(errno));
468 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
471 return if_indextoname(ifindex, buf);
474 static int read_sysfs_hex_int(char *path)
476 char vendor_id_buf[8];
480 fd = open(path, O_RDONLY);
482 p_err("Can't open %s: %s", path, strerror(errno));
486 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
489 p_err("Can't read %s: %s", path, strerror(errno));
492 if (len >= (int)sizeof(vendor_id_buf)) {
493 p_err("Value in %s too long", path);
497 vendor_id_buf[len] = 0;
499 return strtol(vendor_id_buf, NULL, 0);
502 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
506 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
507 devname, entry_name);
509 return read_sysfs_hex_int(full_path);
513 ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
516 char devname[IF_NAMESIZE];
520 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
521 p_err("Can't get net device name for ifindex %d: %s", ifindex,
526 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
528 p_err("Can't get device vendor id for %s", devname);
534 device_id = read_sysfs_netdev_hex_int(devname, "device");
535 if (device_id != 0x4000 &&
536 device_id != 0x6000 &&
538 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
542 p_err("Can't get bfd arch name for device vendor id 0x%04x",
548 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
550 char name[IF_NAMESIZE];
555 printf(" offloaded_to ");
556 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
559 printf("ifindex %u ns_dev %llu ns_ino %llu",
560 ifindex, ns_dev, ns_inode);
563 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
565 char name[IF_NAMESIZE];
570 jsonw_name(json_wtr, "dev");
571 jsonw_start_object(json_wtr);
572 jsonw_uint_field(json_wtr, "ifindex", ifindex);
573 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
574 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
575 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
576 jsonw_string_field(json_wtr, "ifname", name);
577 jsonw_end_object(json_wtr);
580 int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
587 p_err("%s already specified", what);
591 *val = strtoul(**argv, &endptr, 0);
593 p_err("can't parse %s as %s", **argv, what);