2 * Copyright (C) 2017 Netronome Systems, Inc.
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.
9 * The BSD 2-Clause License:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * 1. Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 /* Author: Jakub Kicinski <kubakici@wp.pl> */
46 #include <linux/limits.h>
47 #include <linux/magic.h>
49 #include <sys/mount.h>
51 #include <sys/types.h>
59 #define BPF_FS_MAGIC 0xcafe4a11
62 void p_err(const char *fmt, ...)
68 jsonw_start_object(json_wtr);
69 jsonw_name(json_wtr, "error");
70 jsonw_vprintf_enquote(json_wtr, fmt, ap);
71 jsonw_end_object(json_wtr);
73 fprintf(stderr, "Error: ");
74 vfprintf(stderr, fmt, ap);
75 fprintf(stderr, "\n");
80 void p_info(const char *fmt, ...)
88 vfprintf(stderr, fmt, ap);
89 fprintf(stderr, "\n");
93 static bool is_bpffs(char *path)
97 if (statfs(path, &st_fs) < 0)
100 return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
103 static int mnt_bpffs(const char *target, char *buff, size_t bufflen)
105 bool bind_done = false;
107 while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
108 if (errno != EINVAL || bind_done) {
109 snprintf(buff, bufflen,
110 "mount --make-private %s failed: %s",
111 target, strerror(errno));
115 if (mount(target, target, "none", MS_BIND, NULL)) {
116 snprintf(buff, bufflen,
117 "mount --bind %s %s failed: %s",
118 target, target, strerror(errno));
125 if (mount("bpf", target, "bpf", 0, "mode=0700")) {
126 snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s",
127 target, strerror(errno));
134 int open_obj_pinned(char *path)
138 fd = bpf_obj_get(path);
140 p_err("bpf obj get (%s): %s", path,
141 errno == EACCES && !is_bpffs(dirname(path)) ?
142 "directory not in bpf file system (bpffs)" :
150 int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
152 enum bpf_obj_type type;
155 fd = open_obj_pinned(path);
159 type = get_fd_type(fd);
164 if (type != exp_type) {
165 p_err("incorrect object type: %s", get_fd_type_name(type));
173 int do_pin_fd(int fd, const char *name)
175 char err_str[ERR_MAX_LEN];
180 err = bpf_obj_pin(fd, name);
184 file = malloc(strlen(name) + 1);
188 if (errno != EPERM || is_bpffs(dir)) {
189 p_err("can't pin the object (%s): %s", name, strerror(errno));
193 /* Attempt to mount bpffs, then retry pinning. */
194 err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
196 err = bpf_obj_pin(fd, name);
198 p_err("can't pin the object (%s): %s", name,
201 err_str[ERR_MAX_LEN - 1] = '\0';
202 p_err("can't mount BPF file system to pin the object (%s): %s",
212 int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
219 if (!is_prefix(*argv, "id")) {
220 p_err("expected 'id' got %s", *argv);
225 id = strtoul(*argv, &endptr, 0);
227 p_err("can't parse %s as ID", *argv);
235 fd = get_fd_by_id(id);
237 p_err("can't get prog by id (%u): %s", id, strerror(errno));
241 err = do_pin_fd(fd, *argv);
247 const char *get_fd_type_name(enum bpf_obj_type type)
249 static const char * const names[] = {
250 [BPF_OBJ_UNKNOWN] = "unknown",
251 [BPF_OBJ_PROG] = "prog",
252 [BPF_OBJ_MAP] = "map",
255 if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
256 return names[BPF_OBJ_UNKNOWN];
261 int get_fd_type(int fd)
267 snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);
269 n = readlink(path, buf, sizeof(buf));
271 p_err("can't read link type: %s", strerror(errno));
274 if (n == sizeof(path)) {
275 p_err("can't read link type: path too long!");
279 if (strstr(buf, "bpf-map"))
281 else if (strstr(buf, "bpf-prog"))
284 return BPF_OBJ_UNKNOWN;
287 char *get_fdinfo(int fd, const char *key)
295 snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd);
297 fdi = fopen(path, "r");
299 p_err("can't open fdinfo: %s", strerror(errno));
303 while ((n = getline(&line, &line_n, fdi))) {
307 if (!strstr(line, key))
312 value = strchr(line, '\t');
313 if (!value || !value[1]) {
314 p_err("malformed fdinfo!?");
321 memmove(line, value, len);
322 line[len - 1] = '\0';
327 p_err("key '%s' not found in fdinfo", key);
333 void print_hex_data_json(uint8_t *data, size_t len)
337 jsonw_start_array(json_wtr);
338 for (i = 0; i < len; i++)
339 jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
340 jsonw_end_array(json_wtr);
343 int build_pinned_obj_table(struct pinned_obj_table *tab,
344 enum bpf_obj_type type)
346 struct bpf_prog_info pinned_info = {};
347 struct pinned_obj *obj_node = NULL;
348 __u32 len = sizeof(pinned_info);
349 struct mntent *mntent = NULL;
350 enum bpf_obj_type objtype;
351 FILE *mntfile = NULL;
356 mntfile = setmntent("/proc/mounts", "r");
360 while ((mntent = getmntent(mntfile))) {
361 char *path[] = { mntent->mnt_dir, NULL };
363 if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
366 fts = fts_open(path, 0, NULL);
370 while ((ftse = fts_read(fts))) {
371 if (!(ftse->fts_info & FTS_F))
373 fd = open_obj_pinned(ftse->fts_path);
377 objtype = get_fd_type(fd);
378 if (objtype != type) {
382 memset(&pinned_info, 0, sizeof(pinned_info));
383 err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
389 obj_node = malloc(sizeof(*obj_node));
397 memset(obj_node, 0, sizeof(*obj_node));
398 obj_node->id = pinned_info.id;
399 obj_node->path = strdup(ftse->fts_path);
400 hash_add(tab->table, &obj_node->hash, obj_node->id);
410 void delete_pinned_obj_table(struct pinned_obj_table *tab)
412 struct pinned_obj *obj;
413 struct hlist_node *tmp;
416 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
417 hash_del(&obj->hash);
424 ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
429 err = stat("/proc/self/ns/net", &st);
431 p_err("Can't stat /proc/self: %s", strerror(errno));
435 if (st.st_dev != ns_dev || st.st_ino != ns_ino)
438 return if_indextoname(ifindex, buf);
441 static int read_sysfs_hex_int(char *path)
443 char vendor_id_buf[8];
447 fd = open(path, O_RDONLY);
449 p_err("Can't open %s: %s", path, strerror(errno));
453 len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
456 p_err("Can't read %s: %s", path, strerror(errno));
459 if (len >= (int)sizeof(vendor_id_buf)) {
460 p_err("Value in %s too long", path);
464 vendor_id_buf[len] = 0;
466 return strtol(vendor_id_buf, NULL, 0);
469 static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
473 snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
474 devname, entry_name);
476 return read_sysfs_hex_int(full_path);
479 const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino)
481 char devname[IF_NAMESIZE];
485 if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
486 p_err("Can't get net device name for ifindex %d: %s", ifindex,
491 vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
493 p_err("Can't get device vendor id for %s", devname);
499 device_id = read_sysfs_netdev_hex_int(devname, "device");
500 if (device_id != 0x4000 &&
501 device_id != 0x6000 &&
503 p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
506 p_err("Can't get bfd arch name for device vendor id 0x%04x",
512 void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
514 char name[IF_NAMESIZE];
520 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
523 printf("ifindex %u ns_dev %llu ns_ino %llu",
524 ifindex, ns_dev, ns_inode);
527 void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
529 char name[IF_NAMESIZE];
534 jsonw_name(json_wtr, "dev");
535 jsonw_start_object(json_wtr);
536 jsonw_uint_field(json_wtr, "ifindex", ifindex);
537 jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
538 jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
539 if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
540 jsonw_string_field(json_wtr, "ifname", name);
541 jsonw_end_object(json_wtr);