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  *   c<bus_id>                             — CCW bus group name, without leading zeros [s390]
  38  *   o<index>[n<phys_port_name>|d<dev_port>]
  39  *                                         — on-board device index number
  40  *   s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
  41  *                                         — hotplug slot index number
  42  *   x<MAC>                                — MAC address
  43  *   [P<domain>]p<bus>s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
  44  *                                         — PCI geographical location
  45  *   [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
  46  *                                         — USB port number chain
  47  *
  48  * All multi-function PCI devices will carry the [f<function>] number in the
  49  * device name, including the function 0 device.
  50  *
  51  * When using PCI geography, The PCI domain is only prepended when it is not 0.
  52  *
  53  * For USB devices the full chain of port numbers of hubs is composed. If the
  54  * name gets longer than the maximum number of 15 characters, the name is not
  55  * exported.
  56  * The usual USB configuration == 1 and interface == 0 values are suppressed.
  57  *
  58  * PCI Ethernet card with firmware index "1":
  59  *   ID_NET_NAME_ONBOARD=eno1
  60  *   ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1
  61  *
  62  * PCI Ethernet card in hotplug slot with firmware index number:
  63  *   /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1
  64  *   ID_NET_NAME_MAC=enx000000000466
  65  *   ID_NET_NAME_PATH=enp5s0
  66  *   ID_NET_NAME_SLOT=ens1
  67  *
  68  * PCI Ethernet multi-function card with 2 ports:
  69  *   /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/enp2s0f0
  70  *   ID_NET_NAME_MAC=enx78e7d1ea46da
  71  *   ID_NET_NAME_PATH=enp2s0f0
  72  *   /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.1/net/enp2s0f1
  73  *   ID_NET_NAME_MAC=enx78e7d1ea46dc
  74  *   ID_NET_NAME_PATH=enp2s0f1
  75  *
  76  * PCI wlan card:
  77  *   /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlp3s0
  78  *   ID_NET_NAME_MAC=wlx0024d7e31130
  79  *   ID_NET_NAME_PATH=wlp3s0
  80  *
  81  * USB built-in 3G modem:
  82  *   /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.6/net/wwp0s29u1u4i6
  83  *   ID_NET_NAME_MAC=wwx028037ec0200
  84  *   ID_NET_NAME_PATH=wwp0s29u1u4i6
  85  *
  86  * USB Android phone:
  87  *   /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/net/enp0s29u1u2
  88  *   ID_NET_NAME_MAC=enxd626b3450fb5
  89  *   ID_NET_NAME_PATH=enp0s29u1u2
  90  */
  91
  92 #include <errno.h>
  93 #include <fcntl.h>
  94 #include <net/if.h>
  95 #include <net/if_arp.h>
  96 #include <stdarg.h>
  97 #include <stdio.h>
  98 #include <stdlib.h>
  99 #include <string.h>
 100 #include <unistd.h>
 101 #include <linux/pci_regs.h>
 102
 103 #include "fd-util.h"
 104 #include "fileio.h"
 105 #include "stdio-util.h"
 106 #include "string-util.h"
 107 #include "udev.h"
 108
 109 #define ONBOARD_INDEX_MAX (16*1024-1)
 110
 111 enum netname_type{
 112         NET_UNDEF,
 113         NET_PCI,
 114         NET_USB,
 115         NET_BCMA,
 116         NET_VIRTIO,
 117         NET_CCWGROUP,
 118 };
 119
 120 struct netnames {
 121         enum netname_type type;
 122
 123         uint8_t mac[6];
 124         bool mac_valid;
 125
 126         struct udev_device *pcidev;
 127         char pci_slot[IFNAMSIZ];
 128         char pci_path[IFNAMSIZ];
 129         char pci_onboard[IFNAMSIZ];
 130         const char *pci_onboard_label;
 131
 132         char usb_ports[IFNAMSIZ];
 133         char bcma_core[IFNAMSIZ];
 134         char ccw_group[IFNAMSIZ];
 135 };
 136
 137 /* retrieve on-board index number and label from firmware */
 138 static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
 139         unsigned dev_port = 0;
 140         size_t l;
 141         char *s;
 142         const char *attr, *port_name;
 143         int idx;
 144
 145         /* ACPI _DSM  — device specific method for naming a PCI or PCI Express device */
 146         attr = udev_device_get_sysattr_value(names->pcidev, "acpi_index");
 147         /* SMBIOS type 41 — Onboard Devices Extended Information */
 148         if (!attr)
 149                 attr = udev_device_get_sysattr_value(names->pcidev, "index");
 150         if (!attr)
 151                 return -ENOENT;
 152
 153         idx = strtoul(attr, NULL, 0);
 154         if (idx <= 0)
 155                 return -EINVAL;
 156
 157         /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
 158          * example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
 159          * cut-off, which is somewhere beyond the realistic number of physical network interface a system might
 160          * have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
 161         if (idx > ONBOARD_INDEX_MAX)
 162                 return -ENOENT;
 163
 164         /* kernel provided port index for multiple ports on a single PCI function */
 165         attr = udev_device_get_sysattr_value(dev, "dev_port");
 166         if (attr)
 167                 dev_port = strtol(attr, NULL, 10);
 168
 169         /* kernel provided front panel port name for multiple port PCI device */
 170         port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
 171
 172         s = names->pci_onboard;
 173         l = sizeof(names->pci_onboard);
 174         l = strpcpyf(&s, l, "o%d", idx);
 175         if (port_name)
 176                 l = strpcpyf(&s, l, "n%s", port_name);
 177         else if (dev_port > 0)
 178                 l = strpcpyf(&s, l, "d%d", dev_port);
 179         if (l == 0)
 180                 names->pci_onboard[0] = '\0';
 181
 182         names->pci_onboard_label = udev_device_get_sysattr_value(names->pcidev, "label");
 183
 184         return 0;
 185 }
 186
 187 /* read the 256 bytes PCI configuration space to check the multi-function bit */
 188 static bool is_pci_multifunction(struct udev_device *dev) {
 189         _cleanup_close_ int fd = -1;
 190         const char *filename;
 191         uint8_t config[64];
 192
 193         filename = strjoina(udev_device_get_syspath(dev), "/config");
 194         fd = open(filename, O_RDONLY | O_CLOEXEC);
 195         if (fd < 0)
 196                 return false;
 197         if (read(fd, &config, sizeof(config)) != sizeof(config))
 198                 return false;
 199
 200         /* bit 0-6 header type, bit 7 multi/single function device */
 201         if ((config[PCI_HEADER_TYPE] & 0x80) != 0)
 202                 return true;
 203
 204         return false;
 205 }
 206
 207 static int dev_pci_slot(struct udev_device *dev, struct netnames *names) {
 208         struct udev *udev = udev_device_get_udev(names->pcidev);
 209         unsigned domain, bus, slot, func, dev_port = 0;
 210         size_t l;
 211         char *s;
 212         const char *attr, *port_name;
 213         struct udev_device *pci = NULL;
 214         char slots[PATH_MAX];
 215         _cleanup_closedir_ DIR *dir = NULL;
 216         struct dirent *dent;
 217         int hotplug_slot = 0, err = 0;
 218
 219         if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
 220                 return -ENOENT;
 221
 222         /* kernel provided port index for multiple ports on a single PCI function */
 223         attr = udev_device_get_sysattr_value(dev, "dev_port");
 224         if (attr)
 225                 dev_port = strtol(attr, NULL, 10);
 226
 227         /* kernel provided front panel port name for multiple port PCI device */
 228         port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
 229
 230         /* compose a name based on the raw kernel's PCI bus, slot numbers */
 231         s = names->pci_path;
 232         l = sizeof(names->pci_path);
 233         if (domain > 0)
 234                 l = strpcpyf(&s, l, "P%u", domain);
 235         l = strpcpyf(&s, l, "p%us%u", bus, slot);
 236         if (func > 0 || is_pci_multifunction(names->pcidev))
 237                 l = strpcpyf(&s, l, "f%u", func);
 238         if (port_name)
 239                 l = strpcpyf(&s, l, "n%s", port_name);
 240         else if (dev_port > 0)
 241                 l = strpcpyf(&s, l, "d%u", dev_port);
 242         if (l == 0)
 243                 names->pci_path[0] = '\0';
 244
 245         /* ACPI _SUN  — slot user number */
 246         pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
 247         if (!pci) {
 248                 err = -ENOENT;
 249                 goto out;
 250         }
 251
 252         snprintf(slots, sizeof slots, "%s/slots", udev_device_get_syspath(pci));
 253         dir = opendir(slots);
 254         if (!dir) {
 255                 err = -errno;
 256                 goto out;
 257         }
 258
 259         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 260                 int i;
 261                 char *rest, *address, str[PATH_MAX];
 262
 263                 if (dent->d_name[0] == '.')
 264                         continue;
 265                 i = strtol(dent->d_name, &rest, 10);
 266                 if (rest[0] != '\0')
 267                         continue;
 268                 if (i < 1)
 269                         continue;
 270
 271                 snprintf(str, sizeof str, "%s/%s/address", slots, dent->d_name);
 272                 if (read_one_line_file(str, &address) >= 0) {
 273                         /* match slot address with device by stripping the function */
 274                         if (strneq(address, udev_device_get_sysname(names->pcidev), strlen(address)))
 275                                 hotplug_slot = i;
 276                         free(address);
 277                 }
 278
 279                 if (hotplug_slot > 0)
 280                         break;
 281         }
 282
 283         if (hotplug_slot > 0) {
 284                 s = names->pci_slot;
 285                 l = sizeof(names->pci_slot);
 286                 if (domain > 0)
 287                         l = strpcpyf(&s, l, "P%d", domain);
 288                 l = strpcpyf(&s, l, "s%d", hotplug_slot);
 289                 if (func > 0 || is_pci_multifunction(names->pcidev))
 290                         l = strpcpyf(&s, l, "f%d", func);
 291                 if (port_name)
 292                         l = strpcpyf(&s, l, "n%s", port_name);
 293                 else if (dev_port > 0)
 294                         l = strpcpyf(&s, l, "d%d", dev_port);
 295                 if (l == 0)
 296                         names->pci_slot[0] = '\0';
 297         }
 298 out:
 299         udev_device_unref(pci);
 300         return err;
 301 }
 302
 303 static int names_pci(struct udev_device *dev, struct netnames *names) {
 304         struct udev_device *parent;
 305
 306         assert(dev);
 307         assert(names);
 308
 309         parent = udev_device_get_parent(dev);
 310
 311         /* there can only ever be one virtio bus per parent device, so we can
 312            safely ignore any virtio buses. see
 313            <http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html> */
 314         while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
 315                 parent = udev_device_get_parent(parent);
 316
 317         if (!parent)
 318                 return -ENOENT;
 319
 320         /* check if our direct parent is a PCI device with no other bus in-between */
 321         if (streq_ptr("pci", udev_device_get_subsystem(parent))) {
 322                 names->type = NET_PCI;
 323                 names->pcidev = parent;
 324         } else {
 325                 names->pcidev = udev_device_get_parent_with_subsystem_devtype(dev, "pci", NULL);
 326                 if (!names->pcidev)
 327                         return -ENOENT;
 328         }
 329         dev_pci_onboard(dev, names);
 330         dev_pci_slot(dev, names);
 331         return 0;
 332 }
 333
 334 static int names_usb(struct udev_device *dev, struct netnames *names) {
 335         struct udev_device *usbdev;
 336         char name[256];
 337         char *ports;
 338         char *config;
 339         char *interf;
 340         size_t l;
 341         char *s;
 342
 343         assert(dev);
 344         assert(names);
 345
 346         usbdev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
 347         if (!usbdev)
 348                 return -ENOENT;
 349
 350         /* get USB port number chain, configuration, interface */
 351         strscpy(name, sizeof(name), udev_device_get_sysname(usbdev));
 352         s = strchr(name, '-');
 353         if (!s)
 354                 return -EINVAL;
 355         ports = s+1;
 356
 357         s = strchr(ports, ':');
 358         if (!s)
 359                 return -EINVAL;
 360         s[0] = '\0';
 361         config = s+1;
 362
 363         s = strchr(config, '.');
 364         if (!s)
 365                 return -EINVAL;
 366         s[0] = '\0';
 367         interf = s+1;
 368
 369         /* prefix every port number in the chain with "u" */
 370         s = ports;
 371         while ((s = strchr(s, '.')))
 372                 s[0] = 'u';
 373         s = names->usb_ports;
 374         l = strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL);
 375
 376         /* append USB config number, suppress the common config == 1 */
 377         if (!streq(config, "1"))
 378                 l = strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL);
 379
 380         /* append USB interface number, suppress the interface == 0 */
 381         if (!streq(interf, "0"))
 382                 l = strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL);
 383         if (l == 0)
 384                 return -ENAMETOOLONG;
 385
 386         names->type = NET_USB;
 387         return 0;
 388 }
 389
 390 static int names_bcma(struct udev_device *dev, struct netnames *names) {
 391         struct udev_device *bcmadev;
 392         unsigned int core;
 393
 394         assert(dev);
 395         assert(names);
 396
 397         bcmadev = udev_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL);
 398         if (!bcmadev)
 399                 return -ENOENT;
 400
 401         /* bus num:core num */
 402         if (sscanf(udev_device_get_sysname(bcmadev), "bcma%*u:%u", &core) != 1)
 403                 return -EINVAL;
 404         /* suppress the common core == 0 */
 405         if (core > 0)
 406                 xsprintf(names->bcma_core, "b%u", core);
 407
 408         names->type = NET_BCMA;
 409         return 0;
 410 }
 411
 412 static int names_ccw(struct  udev_device *dev, struct netnames *names) {
 413         struct udev_device *cdev;
 414         const char *bus_id;
 415         size_t bus_id_len;
 416         int rc;
 417
 418         assert(dev);
 419         assert(names);
 420
 421         /* Retrieve the associated CCW device */
 422         cdev = udev_device_get_parent(dev);
 423         if (!cdev)
 424                 return -ENOENT;
 425
 426         /* Network devices are always grouped CCW devices */
 427         if (!streq_ptr("ccwgroup", udev_device_get_subsystem(cdev)))
 428                 return -ENOENT;
 429
 430         /* Retrieve bus-ID of the grouped CCW device.  The bus-ID uniquely
 431          * identifies the network device on the Linux on System z channel
 432          * subsystem.  Note that the bus-ID contains lowercase characters.
 433          */
 434         bus_id = udev_device_get_sysname(cdev);
 435         if (!bus_id)
 436                 return -ENOENT;
 437
 438         /* Check the length of the bus-ID.  Rely on that the kernel provides
 439          * a correct bus-ID; alternatively, improve this check and parse and
 440          * verify each bus-ID part...
 441          */
 442         bus_id_len = strlen(bus_id);
 443         if (!bus_id_len || bus_id_len < 8 || bus_id_len > 9)
 444                 return -EINVAL;
 445
 446         /* Strip leading zeros from the bus id for aesthetic purposes. This
 447          * keeps the ccw names stable, yet much shorter in general case of
 448          * bus_id 0.0.0600 -> 600. This is similar to e.g. how PCI domain is
 449          * not prepended when it is zero.
 450          */
 451         bus_id += strspn(bus_id, ".0");
 452
 453         /* Store the CCW bus-ID for use as network device name */
 454         rc = snprintf(names->ccw_group, sizeof(names->ccw_group), "c%s", bus_id);
 455         if (rc >= 0 && rc < (int)sizeof(names->ccw_group))
 456                 names->type = NET_CCWGROUP;
 457         return 0;
 458 }
 459
 460 static int names_mac(struct udev_device *dev, struct netnames *names) {
 461         const char *s;
 462         unsigned int i;
 463         unsigned int a1, a2, a3, a4, a5, a6;
 464
 465         /* check for NET_ADDR_PERM, skip random MAC addresses */
 466         s = udev_device_get_sysattr_value(dev, "addr_assign_type");
 467         if (!s)
 468                 return EXIT_FAILURE;
 469         i = strtoul(s, NULL, 0);
 470         if (i != 0)
 471                 return 0;
 472
 473         s = udev_device_get_sysattr_value(dev, "address");
 474         if (!s)
 475                 return -ENOENT;
 476         if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
 477                 return -EINVAL;
 478
 479         /* skip empty MAC addresses */
 480         if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
 481                 return -EINVAL;
 482
 483         names->mac[0] = a1;
 484         names->mac[1] = a2;
 485         names->mac[2] = a3;
 486         names->mac[3] = a4;
 487         names->mac[4] = a5;
 488         names->mac[5] = a6;
 489         names->mac_valid = true;
 490         return 0;
 491 }
 492
 493 /* IEEE Organizationally Unique Identifier vendor string */
 494 static int ieee_oui(struct udev_device *dev, struct netnames *names, bool test) {
 495         char str[32];
 496
 497         if (!names->mac_valid)
 498                 return -ENOENT;
 499         /* skip commonly misused 00:00:00 (Xerox) prefix */
 500         if (memcmp(names->mac, "\0\0\0", 3) == 0)
 501                 return -EINVAL;
 502         xsprintf(str, "OUI:%02X%02X%02X%02X%02X%02X", names->mac[0],
 503                  names->mac[1], names->mac[2], names->mac[3], names->mac[4],
 504                  names->mac[5]);
 505         udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test);
 506         return 0;
 507 }
 508
 509 static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
 510         const char *s;
 511         const char *p;
 512         unsigned int i;
 513         const char *devtype;
 514         const char *prefix = "en";
 515         struct netnames names = {};
 516         int err;
 517
 518         /* handle only ARPHRD_ETHER and ARPHRD_SLIP devices */
 519         s = udev_device_get_sysattr_value(dev, "type");
 520         if (!s)
 521                 return EXIT_FAILURE;
 522         i = strtoul(s, NULL, 0);
 523         switch (i) {
 524         case ARPHRD_ETHER:
 525                 prefix = "en";
 526                 break;
 527         case ARPHRD_SLIP:
 528                 prefix = "sl";
 529                 break;
 530         default:
 531                 return 0;
 532         }
 533
 534         /* skip stacked devices, like VLANs, ... */
 535         s = udev_device_get_sysattr_value(dev, "ifindex");
 536         if (!s)
 537                 return EXIT_FAILURE;
 538         p = udev_device_get_sysattr_value(dev, "iflink");
 539         if (!p)
 540                 return EXIT_FAILURE;
 541         if (!streq(s, p))
 542                 return 0;
 543
 544         devtype = udev_device_get_devtype(dev);
 545         if (devtype) {
 546                 if (streq("wlan", devtype))
 547                         prefix = "wl";
 548                 else if (streq("wwan", devtype))
 549                         prefix = "ww";
 550         }
 551
 552         err = names_mac(dev, &names);
 553         if (err >= 0 && names.mac_valid) {
 554                 char str[IFNAMSIZ];
 555
 556                 xsprintf(str, "%sx%02x%02x%02x%02x%02x%02x", prefix,
 557                          names.mac[0], names.mac[1], names.mac[2],
 558                          names.mac[3], names.mac[4], names.mac[5]);
 559                 udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
 560
 561                 ieee_oui(dev, &names, test);
 562         }
 563
 564         /* get path names for Linux on System z network devices */
 565         err = names_ccw(dev, &names);
 566         if (err >= 0 && names.type == NET_CCWGROUP) {
 567                 char str[IFNAMSIZ];
 568
 569                 if (snprintf(str, sizeof(str), "%s%s", prefix, names.ccw_group) < (int)sizeof(str))
 570                         udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 571                 goto out;
 572         }
 573
 574         /* get PCI based path names, we compose only PCI based paths */
 575         err = names_pci(dev, &names);
 576         if (err < 0)
 577                 goto out;
 578
 579         /* plain PCI device */
 580         if (names.type == NET_PCI) {
 581                 char str[IFNAMSIZ];
 582
 583                 if (names.pci_onboard[0])
 584                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard) < (int)sizeof(str))
 585                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);
 586
 587                 if (names.pci_onboard_label)
 588                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard_label) < (int)sizeof(str))
 589                                 udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str);
 590
 591                 if (names.pci_path[0])
 592                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_path) < (int)sizeof(str))
 593                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 594
 595                 if (names.pci_slot[0])
 596                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_slot) < (int)sizeof(str))
 597                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 598                 goto out;
 599         }
 600
 601         /* USB device */
 602         err = names_usb(dev, &names);
 603         if (err >= 0 && names.type == NET_USB) {
 604                 char str[IFNAMSIZ];
 605
 606                 if (names.pci_path[0])
 607                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.usb_ports) < (int)sizeof(str))
 608                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 609
 610                 if (names.pci_slot[0])
 611                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.usb_ports) < (int)sizeof(str))
 612                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 613                 goto out;
 614         }
 615
 616         /* Broadcom bus */
 617         err = names_bcma(dev, &names);
 618         if (err >= 0 && names.type == NET_BCMA) {
 619                 char str[IFNAMSIZ];
 620
 621                 if (names.pci_path[0])
 622                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.bcma_core) < (int)sizeof(str))
 623                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 624
 625                 if (names.pci_slot[0])
 626                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.bcma_core) < (int)sizeof(str))
 627                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 628                 goto out;
 629         }
 630 out:
 631         return EXIT_SUCCESS;
 632 }
 633
 634 const struct udev_builtin udev_builtin_net_id = {
 635         .name = "net_id",
 636         .cmd = builtin_net_id,
 637         .help = "Network device properties",
 638 };