src/udev/udev-builtin-net_id.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2012 Kay Sievers <kay@vrfy.org>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 /*
  21  * Predictable network interface device names based on:
  22  *  - firmware/bios-provided index numbers for on-board devices
  23  *  - firmware-provided pci-express hotplug slot index number
  24  *  - physical/geographical location of the hardware
  25  *  - the interface's MAC address
  26  *
  27  * http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames
  28  *
  29  * Two character prefixes based on the type of interface:
  30  *   en -- Ethernet
  31  *   sl -- serial line IP (slip)
  32  *   wl -- wlan
  33  *   ww -- wwan
  34  *
  35  * Type of names:
  36  *   b<number>                             -- BCMA bus core number
  37  *   ccw<name>                             -- CCW bus group name
  38  *   o<index>[d<dev_port>]                 -- on-board device index number
  39  *   s<slot>[f<function>][d<dev_port>]     -- hotplug slot index number
  40  *   x<MAC>                                -- MAC address
  41  *   [P<domain>]p<bus>s<slot>[f<function>][d<dev_port>]
  42  *                                         -- PCI geographical location
  43  *   [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
  44  *                                         -- USB port number chain
  45  *
  46  * All multi-function PCI devices will carry the [f<function>] number in the
  47  * device name, including the function 0 device.
  48  *
  49  * When using PCI geography, The PCI domain is only prepended when it is not 0.
  50  *
  51  * For USB devices the full chain of port numbers of hubs is composed. If the
  52  * name gets longer than the maximum number of 15 characters, the name is not
  53  * exported.
  54  * The usual USB configuration == 1 and interface == 0 values are suppressed.
  55  *
  56  * PCI Ethernet card with firmware index "1":
  57  *   ID_NET_NAME_ONBOARD=eno1
  58  *   ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1
  59  *
  60  * PCI Ethernet card in hotplug slot with firmware index number:
  61  *   /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1
  62  *   ID_NET_NAME_MAC=enx000000000466
  63  *   ID_NET_NAME_PATH=enp5s0
  64  *   ID_NET_NAME_SLOT=ens1
  65  *
  66  * PCI Ethernet multi-function card with 2 ports:
  67  *   /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/enp2s0f0
  68  *   ID_NET_NAME_MAC=enx78e7d1ea46da
  69  *   ID_NET_NAME_PATH=enp2s0f0
  70  *   /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.1/net/enp2s0f1
  71  *   ID_NET_NAME_MAC=enx78e7d1ea46dc
  72  *   ID_NET_NAME_PATH=enp2s0f1
  73  *
  74  * PCI wlan card:
  75  *   /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlp3s0
  76  *   ID_NET_NAME_MAC=wlx0024d7e31130
  77  *   ID_NET_NAME_PATH=wlp3s0
  78  *
  79  * USB built-in 3G modem:
  80  *   /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.6/net/wwp0s29u1u4i6
  81  *   ID_NET_NAME_MAC=wwx028037ec0200
  82  *   ID_NET_NAME_PATH=wwp0s29u1u4i6
  83  *
  84  * USB Android phone:
  85  *   /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/net/enp0s29u1u2
  86  *   ID_NET_NAME_MAC=enxd626b3450fb5
  87  *   ID_NET_NAME_PATH=enp0s29u1u2
  88  */
  89
  90 #include <errno.h>
  91 #include <fcntl.h>
  92 #include <net/if.h>
  93 #include <net/if_arp.h>
  94 #include <stdarg.h>
  95 #include <stdio.h>
  96 #include <stdlib.h>
  97 #include <string.h>
  98 #include <unistd.h>
  99 #include <linux/pci_regs.h>
 100
 101 #include "fd-util.h"
 102 #include "fileio.h"
 103 #include "string-util.h"
 104 #include "udev.h"
 105
 106 enum netname_type{
 107         NET_UNDEF,
 108         NET_PCI,
 109         NET_USB,
 110         NET_BCMA,
 111         NET_VIRTIO,
 112         NET_CCWGROUP,
 113 };
 114
 115 struct netnames {
 116         enum netname_type type;
 117
 118         uint8_t mac[6];
 119         bool mac_valid;
 120
 121         struct udev_device *pcidev;
 122         char pci_slot[IFNAMSIZ];
 123         char pci_path[IFNAMSIZ];
 124         char pci_onboard[IFNAMSIZ];
 125         const char *pci_onboard_label;
 126
 127         char usb_ports[IFNAMSIZ];
 128         char bcma_core[IFNAMSIZ];
 129         char ccw_group[IFNAMSIZ];
 130 };
 131
 132 /* retrieve on-board index number and label from firmware */
 133 static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
 134         unsigned dev_port = 0;
 135         size_t l;
 136         char *s;
 137         const char *attr;
 138         int idx;
 139
 140         /* ACPI _DSM  -- device specific method for naming a PCI or PCI Express device */
 141         attr = udev_device_get_sysattr_value(names->pcidev, "acpi_index");
 142         /* SMBIOS type 41 -- Onboard Devices Extended Information */
 143         if (!attr)
 144                 attr = udev_device_get_sysattr_value(names->pcidev, "index");
 145         if (!attr)
 146                 return -ENOENT;
 147
 148         idx = strtoul(attr, NULL, 0);
 149         if (idx <= 0)
 150                 return -EINVAL;
 151
 152         /* kernel provided port index for multiple ports on a single PCI function */
 153         attr = udev_device_get_sysattr_value(dev, "dev_port");
 154         if (attr)
 155                 dev_port = strtol(attr, NULL, 10);
 156
 157         s = names->pci_onboard;
 158         l = sizeof(names->pci_onboard);
 159         l = strpcpyf(&s, l, "o%d", idx);
 160         if (dev_port > 0)
 161                 l = strpcpyf(&s, l, "d%d", dev_port);
 162         if (l == 0)
 163                 names->pci_onboard[0] = '\0';
 164
 165         names->pci_onboard_label = udev_device_get_sysattr_value(names->pcidev, "label");
 166
 167         return 0;
 168 }
 169
 170 /* read the 256 bytes PCI configuration space to check the multi-function bit */
 171 static bool is_pci_multifunction(struct udev_device *dev) {
 172         _cleanup_close_ int fd = -1;
 173         const char *filename;
 174         uint8_t config[64];
 175
 176         filename = strjoina(udev_device_get_syspath(dev), "/config");
 177         fd = open(filename, O_RDONLY | O_CLOEXEC);
 178         if (fd < 0)
 179                 return false;
 180         if (read(fd, &config, sizeof(config)) != sizeof(config))
 181                 return false;
 182
 183         /* bit 0-6 header type, bit 7 multi/single function device */
 184         if ((config[PCI_HEADER_TYPE] & 0x80) != 0)
 185                 return true;
 186
 187         return false;
 188 }
 189
 190 static int dev_pci_slot(struct udev_device *dev, struct netnames *names) {
 191         struct udev *udev = udev_device_get_udev(names->pcidev);
 192         unsigned domain, bus, slot, func, dev_port = 0;
 193         size_t l;
 194         char *s;
 195         const char *attr;
 196         struct udev_device *pci = NULL;
 197         char slots[256], str[256];
 198         _cleanup_closedir_ DIR *dir = NULL;
 199         struct dirent *dent;
 200         int hotplug_slot = 0, err = 0;
 201
 202         if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
 203                 return -ENOENT;
 204
 205         /* kernel provided port index for multiple ports on a single PCI function */
 206         attr = udev_device_get_sysattr_value(dev, "dev_port");
 207         if (attr)
 208                 dev_port = strtol(attr, NULL, 10);
 209
 210         /* compose a name based on the raw kernel's PCI bus, slot numbers */
 211         s = names->pci_path;
 212         l = sizeof(names->pci_path);
 213         if (domain > 0)
 214                 l = strpcpyf(&s, l, "P%u", domain);
 215         l = strpcpyf(&s, l, "p%us%u", bus, slot);
 216         if (func > 0 || is_pci_multifunction(names->pcidev))
 217                 l = strpcpyf(&s, l, "f%u", func);
 218         if (dev_port > 0)
 219                 l = strpcpyf(&s, l, "d%u", dev_port);
 220         if (l == 0)
 221                 names->pci_path[0] = '\0';
 222
 223         /* ACPI _SUN  -- slot user number */
 224         pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
 225         if (!pci) {
 226                 err = -ENOENT;
 227                 goto out;
 228         }
 229         snprintf(slots, sizeof(slots), "%s/slots", udev_device_get_syspath(pci));
 230         dir = opendir(slots);
 231         if (!dir) {
 232                 err = -errno;
 233                 goto out;
 234         }
 235
 236         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 237                 int i;
 238                 char *rest;
 239                 char *address;
 240
 241                 if (dent->d_name[0] == '.')
 242                         continue;
 243                 i = strtol(dent->d_name, &rest, 10);
 244                 if (rest[0] != '\0')
 245                         continue;
 246                 if (i < 1)
 247                         continue;
 248                 snprintf(str, sizeof(str), "%s/%s/address", slots, dent->d_name);
 249                 if (read_one_line_file(str, &address) >= 0) {
 250                         /* match slot address with device by stripping the function */
 251                         if (strneq(address, udev_device_get_sysname(names->pcidev), strlen(address)))
 252                                 hotplug_slot = i;
 253                         free(address);
 254                 }
 255
 256                 if (hotplug_slot > 0)
 257                         break;
 258         }
 259
 260         if (hotplug_slot > 0) {
 261                 s = names->pci_slot;
 262                 l = sizeof(names->pci_slot);
 263                 if (domain > 0)
 264                         l = strpcpyf(&s, l, "P%d", domain);
 265                 l = strpcpyf(&s, l, "s%d", hotplug_slot);
 266                 if (func > 0 || is_pci_multifunction(names->pcidev))
 267                         l = strpcpyf(&s, l, "f%d", func);
 268                 if (dev_port > 0)
 269                         l = strpcpyf(&s, l, "d%d", dev_port);
 270                 if (l == 0)
 271                         names->pci_slot[0] = '\0';
 272         }
 273 out:
 274         udev_device_unref(pci);
 275         return err;
 276 }
 277
 278 static int names_pci(struct udev_device *dev, struct netnames *names) {
 279         struct udev_device *parent;
 280
 281         assert(dev);
 282         assert(names);
 283
 284         parent = udev_device_get_parent(dev);
 285
 286         /* there can only ever be one virtio bus per parent device, so we can
 287            safely ignore any virtio buses. see
 288            <http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html> */
 289         while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
 290                 parent = udev_device_get_parent(parent);
 291
 292         if (!parent)
 293                 return -ENOENT;
 294
 295         /* check if our direct parent is a PCI device with no other bus in-between */
 296         if (streq_ptr("pci", udev_device_get_subsystem(parent))) {
 297                 names->type = NET_PCI;
 298                 names->pcidev = parent;
 299         } else {
 300                 names->pcidev = udev_device_get_parent_with_subsystem_devtype(dev, "pci", NULL);
 301                 if (!names->pcidev)
 302                         return -ENOENT;
 303         }
 304         dev_pci_onboard(dev, names);
 305         dev_pci_slot(dev, names);
 306         return 0;
 307 }
 308
 309 static int names_usb(struct udev_device *dev, struct netnames *names) {
 310         struct udev_device *usbdev;
 311         char name[256];
 312         char *ports;
 313         char *config;
 314         char *interf;
 315         size_t l;
 316         char *s;
 317
 318         assert(dev);
 319         assert(names);
 320
 321         usbdev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
 322         if (!usbdev)
 323                 return -ENOENT;
 324
 325         /* get USB port number chain, configuration, interface */
 326         strscpy(name, sizeof(name), udev_device_get_sysname(usbdev));
 327         s = strchr(name, '-');
 328         if (!s)
 329                 return -EINVAL;
 330         ports = s+1;
 331
 332         s = strchr(ports, ':');
 333         if (!s)
 334                 return -EINVAL;
 335         s[0] = '\0';
 336         config = s+1;
 337
 338         s = strchr(config, '.');
 339         if (!s)
 340                 return -EINVAL;
 341         s[0] = '\0';
 342         interf = s+1;
 343
 344         /* prefix every port number in the chain with "u" */
 345         s = ports;
 346         while ((s = strchr(s, '.')))
 347                 s[0] = 'u';
 348         s = names->usb_ports;
 349         l = strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL);
 350
 351         /* append USB config number, suppress the common config == 1 */
 352         if (!streq(config, "1"))
 353                 l = strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL);
 354
 355         /* append USB interface number, suppress the interface == 0 */
 356         if (!streq(interf, "0"))
 357                 l = strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL);
 358         if (l == 0)
 359                 return -ENAMETOOLONG;
 360
 361         names->type = NET_USB;
 362         return 0;
 363 }
 364
 365 static int names_bcma(struct udev_device *dev, struct netnames *names) {
 366         struct udev_device *bcmadev;
 367         unsigned int core;
 368
 369         assert(dev);
 370         assert(names);
 371
 372         bcmadev = udev_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL);
 373         if (!bcmadev)
 374                 return -ENOENT;
 375
 376         /* bus num:core num */
 377         if (sscanf(udev_device_get_sysname(bcmadev), "bcma%*u:%u", &core) != 1)
 378                 return -EINVAL;
 379         /* suppress the common core == 0 */
 380         if (core > 0)
 381                 snprintf(names->bcma_core, sizeof(names->bcma_core), "b%u", core);
 382
 383         names->type = NET_BCMA;
 384         return 0;
 385 }
 386
 387 static int names_ccw(struct  udev_device *dev, struct netnames *names) {
 388         struct udev_device *cdev;
 389         const char *bus_id;
 390         size_t bus_id_len;
 391         int rc;
 392
 393         assert(dev);
 394         assert(names);
 395
 396         /* Retrieve the associated CCW device */
 397         cdev = udev_device_get_parent(dev);
 398         if (!cdev)
 399                 return -ENOENT;
 400
 401         /* Network devices are always grouped CCW devices */
 402         if (!streq_ptr("ccwgroup", udev_device_get_subsystem(cdev)))
 403                 return -ENOENT;
 404
 405         /* Retrieve bus-ID of the grouped CCW device.  The bus-ID uniquely
 406          * identifies the network device on the Linux on System z channel
 407          * subsystem.  Note that the bus-ID contains lowercase characters.
 408          */
 409         bus_id = udev_device_get_sysname(cdev);
 410         if (!bus_id)
 411                 return -ENOENT;
 412
 413         /* Check the length of the bus-ID.  Rely on that the kernel provides
 414          * a correct bus-ID; alternatively, improve this check and parse and
 415          * verify each bus-ID part...
 416          */
 417         bus_id_len = strlen(bus_id);
 418         if (!bus_id_len || bus_id_len < 8 || bus_id_len > 9)
 419                 return -EINVAL;
 420
 421         /* Store the CCW bus-ID for use as network device name */
 422         rc = snprintf(names->ccw_group, sizeof(names->ccw_group), "ccw%s", bus_id);
 423         if (rc >= 0 && rc < (int)sizeof(names->ccw_group))
 424                 names->type = NET_CCWGROUP;
 425         return 0;
 426 }
 427
 428 static int names_mac(struct udev_device *dev, struct netnames *names) {
 429         const char *s;
 430         unsigned int i;
 431         unsigned int a1, a2, a3, a4, a5, a6;
 432
 433         /* check for NET_ADDR_PERM, skip random MAC addresses */
 434         s = udev_device_get_sysattr_value(dev, "addr_assign_type");
 435         if (!s)
 436                 return EXIT_FAILURE;
 437         i = strtoul(s, NULL, 0);
 438         if (i != 0)
 439                 return 0;
 440
 441         s = udev_device_get_sysattr_value(dev, "address");
 442         if (!s)
 443                 return -ENOENT;
 444         if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
 445                 return -EINVAL;
 446
 447         /* skip empty MAC addresses */
 448         if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
 449                 return -EINVAL;
 450
 451         names->mac[0] = a1;
 452         names->mac[1] = a2;
 453         names->mac[2] = a3;
 454         names->mac[3] = a4;
 455         names->mac[4] = a5;
 456         names->mac[5] = a6;
 457         names->mac_valid = true;
 458         return 0;
 459 }
 460
 461 /* IEEE Organizationally Unique Identifier vendor string */
 462 static int ieee_oui(struct udev_device *dev, struct netnames *names, bool test) {
 463         char str[32];
 464
 465         if (!names->mac_valid)
 466                 return -ENOENT;
 467         /* skip commonly misused 00:00:00 (Xerox) prefix */
 468         if (memcmp(names->mac, "\0\0\0", 3) == 0)
 469                 return -EINVAL;
 470         snprintf(str, sizeof(str), "OUI:%02X%02X%02X%02X%02X%02X",
 471                  names->mac[0], names->mac[1], names->mac[2],
 472                  names->mac[3], names->mac[4], names->mac[5]);
 473         udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test);
 474         return 0;
 475 }
 476
 477 static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
 478         const char *s;
 479         const char *p;
 480         unsigned int i;
 481         const char *devtype;
 482         const char *prefix = "en";
 483         struct netnames names = {};
 484         int err;
 485
 486         /* handle only ARPHRD_ETHER and ARPHRD_SLIP devices */
 487         s = udev_device_get_sysattr_value(dev, "type");
 488         if (!s)
 489                 return EXIT_FAILURE;
 490         i = strtoul(s, NULL, 0);
 491         switch (i) {
 492         case ARPHRD_ETHER:
 493                 prefix = "en";
 494                 break;
 495         case ARPHRD_SLIP:
 496                 prefix = "sl";
 497                 break;
 498         default:
 499                 return 0;
 500         }
 501
 502         /* skip stacked devices, like VLANs, ... */
 503         s = udev_device_get_sysattr_value(dev, "ifindex");
 504         if (!s)
 505                 return EXIT_FAILURE;
 506         p = udev_device_get_sysattr_value(dev, "iflink");
 507         if (!p)
 508                 return EXIT_FAILURE;
 509         if (!streq(s, p))
 510                 return 0;
 511
 512         devtype = udev_device_get_devtype(dev);
 513         if (devtype) {
 514                 if (streq("wlan", devtype))
 515                         prefix = "wl";
 516                 else if (streq("wwan", devtype))
 517                         prefix = "ww";
 518         }
 519
 520         err = names_mac(dev, &names);
 521         if (err >= 0 && names.mac_valid) {
 522                 char str[IFNAMSIZ];
 523
 524                 snprintf(str, sizeof(str), "%sx%02x%02x%02x%02x%02x%02x", prefix,
 525                          names.mac[0], names.mac[1], names.mac[2],
 526                          names.mac[3], names.mac[4], names.mac[5]);
 527                 udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
 528
 529                 ieee_oui(dev, &names, test);
 530         }
 531
 532         /* get path names for Linux on System z network devices */
 533         err = names_ccw(dev, &names);
 534         if (err >= 0 && names.type == NET_CCWGROUP) {
 535                 char str[IFNAMSIZ];
 536
 537                 if (snprintf(str, sizeof(str), "%s%s", prefix, names.ccw_group) < (int)sizeof(str))
 538                         udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 539                 goto out;
 540         }
 541
 542         /* get PCI based path names, we compose only PCI based paths */
 543         err = names_pci(dev, &names);
 544         if (err < 0)
 545                 goto out;
 546
 547         /* plain PCI device */
 548         if (names.type == NET_PCI) {
 549                 char str[IFNAMSIZ];
 550
 551                 if (names.pci_onboard[0])
 552                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard) < (int)sizeof(str))
 553                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);
 554
 555                 if (names.pci_onboard_label)
 556                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard_label) < (int)sizeof(str))
 557                                 udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str);
 558
 559                 if (names.pci_path[0])
 560                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_path) < (int)sizeof(str))
 561                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 562
 563                 if (names.pci_slot[0])
 564                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_slot) < (int)sizeof(str))
 565                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 566                 goto out;
 567         }
 568
 569         /* USB device */
 570         err = names_usb(dev, &names);
 571         if (err >= 0 && names.type == NET_USB) {
 572                 char str[IFNAMSIZ];
 573
 574                 if (names.pci_path[0])
 575                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.usb_ports) < (int)sizeof(str))
 576                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 577
 578                 if (names.pci_slot[0])
 579                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.usb_ports) < (int)sizeof(str))
 580                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 581                 goto out;
 582         }
 583
 584         /* Broadcom bus */
 585         err = names_bcma(dev, &names);
 586         if (err >= 0 && names.type == NET_BCMA) {
 587                 char str[IFNAMSIZ];
 588
 589                 if (names.pci_path[0])
 590                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.bcma_core) < (int)sizeof(str))
 591                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 592
 593                 if (names.pci_slot[0])
 594                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.bcma_core) < (int)sizeof(str))
 595                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 596                 goto out;
 597         }
 598 out:
 599         return EXIT_SUCCESS;
 600 }
 601
 602 const struct udev_builtin udev_builtin_net_id = {
 603         .name = "net_id",
 604         .cmd = builtin_net_id,
 605         .help = "Network device properties",
 606 };