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 "dirent-util.h"
 104 #include "fd-util.h"
 105 #include "fileio.h"
 106 #include "stdio-util.h"
 107 #include "string-util.h"
 108 #include "udev.h"
 109
 110 #define ONBOARD_INDEX_MAX (16*1024-1)
 111
 112 enum netname_type{
 113         NET_UNDEF,
 114         NET_PCI,
 115         NET_USB,
 116         NET_BCMA,
 117         NET_VIRTIO,
 118         NET_CCWGROUP,
 119 };
 120
 121 struct netnames {
 122         enum netname_type type;
 123
 124         uint8_t mac[6];
 125         bool mac_valid;
 126
 127         struct udev_device *pcidev;
 128         char pci_slot[IFNAMSIZ];
 129         char pci_path[IFNAMSIZ];
 130         char pci_onboard[IFNAMSIZ];
 131         const char *pci_onboard_label;
 132
 133         char usb_ports[IFNAMSIZ];
 134         char bcma_core[IFNAMSIZ];
 135         char ccw_group[IFNAMSIZ];
 136 };
 137
 138 /* retrieve on-board index number and label from firmware */
 139 static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
 140         unsigned dev_port = 0;
 141         size_t l;
 142         char *s;
 143         const char *attr, *port_name;
 144         int idx;
 145
 146         /* ACPI _DSM  — device specific method for naming a PCI or PCI Express device */
 147         attr = udev_device_get_sysattr_value(names->pcidev, "acpi_index");
 148         /* SMBIOS type 41 — Onboard Devices Extended Information */
 149         if (!attr)
 150                 attr = udev_device_get_sysattr_value(names->pcidev, "index");
 151         if (!attr)
 152                 return -ENOENT;
 153
 154         idx = strtoul(attr, NULL, 0);
 155         if (idx <= 0)
 156                 return -EINVAL;
 157
 158         /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
 159          * example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
 160          * cut-off, which is somewhere beyond the realistic number of physical network interface a system might
 161          * have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
 162         if (idx > ONBOARD_INDEX_MAX)
 163                 return -ENOENT;
 164
 165         /* kernel provided port index for multiple ports on a single PCI function */
 166         attr = udev_device_get_sysattr_value(dev, "dev_port");
 167         if (attr)
 168                 dev_port = strtol(attr, NULL, 10);
 169
 170         /* kernel provided front panel port name for multiple port PCI device */
 171         port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
 172
 173         s = names->pci_onboard;
 174         l = sizeof(names->pci_onboard);
 175         l = strpcpyf(&s, l, "o%d", idx);
 176         if (port_name)
 177                 l = strpcpyf(&s, l, "n%s", port_name);
 178         else if (dev_port > 0)
 179                 l = strpcpyf(&s, l, "d%d", dev_port);
 180         if (l == 0)
 181                 names->pci_onboard[0] = '\0';
 182
 183         names->pci_onboard_label = udev_device_get_sysattr_value(names->pcidev, "label");
 184
 185         return 0;
 186 }
 187
 188 /* read the 256 bytes PCI configuration space to check the multi-function bit */
 189 static bool is_pci_multifunction(struct udev_device *dev) {
 190         _cleanup_close_ int fd = -1;
 191         const char *filename;
 192         uint8_t config[64];
 193
 194         filename = strjoina(udev_device_get_syspath(dev), "/config");
 195         fd = open(filename, O_RDONLY | O_CLOEXEC);
 196         if (fd < 0)
 197                 return false;
 198         if (read(fd, &config, sizeof(config)) != sizeof(config))
 199                 return false;
 200
 201         /* bit 0-6 header type, bit 7 multi/single function device */
 202         if ((config[PCI_HEADER_TYPE] & 0x80) != 0)
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static int dev_pci_slot(struct udev_device *dev, struct netnames *names) {
 209         struct udev *udev = udev_device_get_udev(names->pcidev);
 210         unsigned domain, bus, slot, func, dev_port = 0;
 211         size_t l;
 212         char *s;
 213         const char *attr, *port_name;
 214         struct udev_device *pci = NULL;
 215         char slots[PATH_MAX];
 216         _cleanup_closedir_ DIR *dir = NULL;
 217         struct dirent *dent;
 218         int hotplug_slot = 0, err = 0;
 219
 220         if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
 221                 return -ENOENT;
 222
 223         /* kernel provided port index for multiple ports on a single PCI function */
 224         attr = udev_device_get_sysattr_value(dev, "dev_port");
 225         if (attr)
 226                 dev_port = strtol(attr, NULL, 10);
 227
 228         /* kernel provided front panel port name for multiple port PCI device */
 229         port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
 230
 231         /* compose a name based on the raw kernel's PCI bus, slot numbers */
 232         s = names->pci_path;
 233         l = sizeof(names->pci_path);
 234         if (domain > 0)
 235                 l = strpcpyf(&s, l, "P%u", domain);
 236         l = strpcpyf(&s, l, "p%us%u", bus, slot);
 237         if (func > 0 || is_pci_multifunction(names->pcidev))
 238                 l = strpcpyf(&s, l, "f%u", func);
 239         if (port_name)
 240                 l = strpcpyf(&s, l, "n%s", port_name);
 241         else if (dev_port > 0)
 242                 l = strpcpyf(&s, l, "d%u", dev_port);
 243         if (l == 0)
 244                 names->pci_path[0] = '\0';
 245
 246         /* ACPI _SUN  — slot user number */
 247         pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
 248         if (!pci) {
 249                 err = -ENOENT;
 250                 goto out;
 251         }
 252
 253         snprintf(slots, sizeof slots, "%s/slots", udev_device_get_syspath(pci));
 254         dir = opendir(slots);
 255         if (!dir) {
 256                 err = -errno;
 257                 goto out;
 258         }
 259
 260         FOREACH_DIRENT_ALL(dent, dir, break) {
 261                 int i;
 262                 char *rest, *address, str[PATH_MAX];
 263
 264                 if (dent->d_name[0] == '.')
 265                         continue;
 266                 i = strtol(dent->d_name, &rest, 10);
 267                 if (rest[0] != '\0')
 268                         continue;
 269                 if (i < 1)
 270                         continue;
 271
 272                 snprintf(str, sizeof str, "%s/%s/address", slots, dent->d_name);
 273                 if (read_one_line_file(str, &address) >= 0) {
 274                         /* match slot address with device by stripping the function */
 275                         if (strneq(address, udev_device_get_sysname(names->pcidev), strlen(address)))
 276                                 hotplug_slot = i;
 277                         free(address);
 278                 }
 279
 280                 if (hotplug_slot > 0)
 281                         break;
 282         }
 283
 284         if (hotplug_slot > 0) {
 285                 s = names->pci_slot;
 286                 l = sizeof(names->pci_slot);
 287                 if (domain > 0)
 288                         l = strpcpyf(&s, l, "P%d", domain);
 289                 l = strpcpyf(&s, l, "s%d", hotplug_slot);
 290                 if (func > 0 || is_pci_multifunction(names->pcidev))
 291                         l = strpcpyf(&s, l, "f%d", func);
 292                 if (port_name)
 293                         l = strpcpyf(&s, l, "n%s", port_name);
 294                 else if (dev_port > 0)
 295                         l = strpcpyf(&s, l, "d%d", dev_port);
 296                 if (l == 0)
 297                         names->pci_slot[0] = '\0';
 298         }
 299 out:
 300         udev_device_unref(pci);
 301         return err;
 302 }
 303
 304 static int names_pci(struct udev_device *dev, struct netnames *names) {
 305         struct udev_device *parent;
 306
 307         assert(dev);
 308         assert(names);
 309
 310         parent = udev_device_get_parent(dev);
 311
 312         /* there can only ever be one virtio bus per parent device, so we can
 313            safely ignore any virtio buses. see
 314            <http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html> */
 315         while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
 316                 parent = udev_device_get_parent(parent);
 317
 318         if (!parent)
 319                 return -ENOENT;
 320
 321         /* check if our direct parent is a PCI device with no other bus in-between */
 322         if (streq_ptr("pci", udev_device_get_subsystem(parent))) {
 323                 names->type = NET_PCI;
 324                 names->pcidev = parent;
 325         } else {
 326                 names->pcidev = udev_device_get_parent_with_subsystem_devtype(dev, "pci", NULL);
 327                 if (!names->pcidev)
 328                         return -ENOENT;
 329         }
 330         dev_pci_onboard(dev, names);
 331         dev_pci_slot(dev, names);
 332         return 0;
 333 }
 334
 335 static int names_usb(struct udev_device *dev, struct netnames *names) {
 336         struct udev_device *usbdev;
 337         char name[256];
 338         char *ports;
 339         char *config;
 340         char *interf;
 341         size_t l;
 342         char *s;
 343
 344         assert(dev);
 345         assert(names);
 346
 347         usbdev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
 348         if (!usbdev)
 349                 return -ENOENT;
 350
 351         /* get USB port number chain, configuration, interface */
 352         strscpy(name, sizeof(name), udev_device_get_sysname(usbdev));
 353         s = strchr(name, '-');
 354         if (!s)
 355                 return -EINVAL;
 356         ports = s+1;
 357
 358         s = strchr(ports, ':');
 359         if (!s)
 360                 return -EINVAL;
 361         s[0] = '\0';
 362         config = s+1;
 363
 364         s = strchr(config, '.');
 365         if (!s)
 366                 return -EINVAL;
 367         s[0] = '\0';
 368         interf = s+1;
 369
 370         /* prefix every port number in the chain with "u" */
 371         s = ports;
 372         while ((s = strchr(s, '.')))
 373                 s[0] = 'u';
 374         s = names->usb_ports;
 375         l = strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL);
 376
 377         /* append USB config number, suppress the common config == 1 */
 378         if (!streq(config, "1"))
 379                 l = strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL);
 380
 381         /* append USB interface number, suppress the interface == 0 */
 382         if (!streq(interf, "0"))
 383                 l = strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL);
 384         if (l == 0)
 385                 return -ENAMETOOLONG;
 386
 387         names->type = NET_USB;
 388         return 0;
 389 }
 390
 391 static int names_bcma(struct udev_device *dev, struct netnames *names) {
 392         struct udev_device *bcmadev;
 393         unsigned int core;
 394
 395         assert(dev);
 396         assert(names);
 397
 398         bcmadev = udev_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL);
 399         if (!bcmadev)
 400                 return -ENOENT;
 401
 402         /* bus num:core num */
 403         if (sscanf(udev_device_get_sysname(bcmadev), "bcma%*u:%u", &core) != 1)
 404                 return -EINVAL;
 405         /* suppress the common core == 0 */
 406         if (core > 0)
 407                 xsprintf(names->bcma_core, "b%u", core);
 408
 409         names->type = NET_BCMA;
 410         return 0;
 411 }
 412
 413 static int names_ccw(struct  udev_device *dev, struct netnames *names) {
 414         struct udev_device *cdev;
 415         const char *bus_id;
 416         size_t bus_id_len;
 417         int rc;
 418
 419         assert(dev);
 420         assert(names);
 421
 422         /* Retrieve the associated CCW device */
 423         cdev = udev_device_get_parent(dev);
 424         if (!cdev)
 425                 return -ENOENT;
 426
 427         /* Network devices are always grouped CCW devices */
 428         if (!streq_ptr("ccwgroup", udev_device_get_subsystem(cdev)))
 429                 return -ENOENT;
 430
 431         /* Retrieve bus-ID of the grouped CCW device.  The bus-ID uniquely
 432          * identifies the network device on the Linux on System z channel
 433          * subsystem.  Note that the bus-ID contains lowercase characters.
 434          */
 435         bus_id = udev_device_get_sysname(cdev);
 436         if (!bus_id)
 437                 return -ENOENT;
 438
 439         /* Check the length of the bus-ID.  Rely on that the kernel provides
 440          * a correct bus-ID; alternatively, improve this check and parse and
 441          * verify each bus-ID part...
 442          */
 443         bus_id_len = strlen(bus_id);
 444         if (!bus_id_len || bus_id_len < 8 || bus_id_len > 9)
 445                 return -EINVAL;
 446
 447         /* Strip leading zeros from the bus id for aesthetic purposes. This
 448          * keeps the ccw names stable, yet much shorter in general case of
 449          * bus_id 0.0.0600 -> 600. This is similar to e.g. how PCI domain is
 450          * not prepended when it is zero.
 451          */
 452         bus_id += strspn(bus_id, ".0");
 453
 454         /* Store the CCW bus-ID for use as network device name */
 455         rc = snprintf(names->ccw_group, sizeof(names->ccw_group), "c%s", bus_id);
 456         if (rc >= 0 && rc < (int)sizeof(names->ccw_group))
 457                 names->type = NET_CCWGROUP;
 458         return 0;
 459 }
 460
 461 static int names_mac(struct udev_device *dev, struct netnames *names) {
 462         const char *s;
 463         unsigned int i;
 464         unsigned int a1, a2, a3, a4, a5, a6;
 465
 466         /* check for NET_ADDR_PERM, skip random MAC addresses */
 467         s = udev_device_get_sysattr_value(dev, "addr_assign_type");
 468         if (!s)
 469                 return EXIT_FAILURE;
 470         i = strtoul(s, NULL, 0);
 471         if (i != 0)
 472                 return 0;
 473
 474         s = udev_device_get_sysattr_value(dev, "address");
 475         if (!s)
 476                 return -ENOENT;
 477         if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
 478                 return -EINVAL;
 479
 480         /* skip empty MAC addresses */
 481         if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
 482                 return -EINVAL;
 483
 484         names->mac[0] = a1;
 485         names->mac[1] = a2;
 486         names->mac[2] = a3;
 487         names->mac[3] = a4;
 488         names->mac[4] = a5;
 489         names->mac[5] = a6;
 490         names->mac_valid = true;
 491         return 0;
 492 }
 493
 494 /* IEEE Organizationally Unique Identifier vendor string */
 495 static int ieee_oui(struct udev_device *dev, struct netnames *names, bool test) {
 496         char str[32];
 497
 498         if (!names->mac_valid)
 499                 return -ENOENT;
 500         /* skip commonly misused 00:00:00 (Xerox) prefix */
 501         if (memcmp(names->mac, "\0\0\0", 3) == 0)
 502                 return -EINVAL;
 503         xsprintf(str, "OUI:%02X%02X%02X%02X%02X%02X", names->mac[0],
 504                  names->mac[1], names->mac[2], names->mac[3], names->mac[4],
 505                  names->mac[5]);
 506         udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test);
 507         return 0;
 508 }
 509
 510 static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
 511         const char *s;
 512         const char *p;
 513         unsigned int i;
 514         const char *devtype;
 515         const char *prefix = "en";
 516         struct netnames names = {};
 517         int err;
 518
 519         /* handle only ARPHRD_ETHER and ARPHRD_SLIP devices */
 520         s = udev_device_get_sysattr_value(dev, "type");
 521         if (!s)
 522                 return EXIT_FAILURE;
 523         i = strtoul(s, NULL, 0);
 524         switch (i) {
 525         case ARPHRD_ETHER:
 526                 prefix = "en";
 527                 break;
 528         case ARPHRD_SLIP:
 529                 prefix = "sl";
 530                 break;
 531         default:
 532                 return 0;
 533         }
 534
 535         /* skip stacked devices, like VLANs, ... */
 536         s = udev_device_get_sysattr_value(dev, "ifindex");
 537         if (!s)
 538                 return EXIT_FAILURE;
 539         p = udev_device_get_sysattr_value(dev, "iflink");
 540         if (!p)
 541                 return EXIT_FAILURE;
 542         if (!streq(s, p))
 543                 return 0;
 544
 545         devtype = udev_device_get_devtype(dev);
 546         if (devtype) {
 547                 if (streq("wlan", devtype))
 548                         prefix = "wl";
 549                 else if (streq("wwan", devtype))
 550                         prefix = "ww";
 551         }
 552
 553         err = names_mac(dev, &names);
 554         if (err >= 0 && names.mac_valid) {
 555                 char str[IFNAMSIZ];
 556
 557                 xsprintf(str, "%sx%02x%02x%02x%02x%02x%02x", prefix,
 558                          names.mac[0], names.mac[1], names.mac[2],
 559                          names.mac[3], names.mac[4], names.mac[5]);
 560                 udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
 561
 562                 ieee_oui(dev, &names, test);
 563         }
 564
 565         /* get path names for Linux on System z network devices */
 566         err = names_ccw(dev, &names);
 567         if (err >= 0 && names.type == NET_CCWGROUP) {
 568                 char str[IFNAMSIZ];
 569
 570                 if (snprintf(str, sizeof(str), "%s%s", prefix, names.ccw_group) < (int)sizeof(str))
 571                         udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 572                 goto out;
 573         }
 574
 575         /* get PCI based path names, we compose only PCI based paths */
 576         err = names_pci(dev, &names);
 577         if (err < 0)
 578                 goto out;
 579
 580         /* plain PCI device */
 581         if (names.type == NET_PCI) {
 582                 char str[IFNAMSIZ];
 583
 584                 if (names.pci_onboard[0])
 585                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard) < (int)sizeof(str))
 586                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);
 587
 588                 if (names.pci_onboard_label)
 589                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard_label) < (int)sizeof(str))
 590                                 udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str);
 591
 592                 if (names.pci_path[0])
 593                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_path) < (int)sizeof(str))
 594                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 595
 596                 if (names.pci_slot[0])
 597                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_slot) < (int)sizeof(str))
 598                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 599                 goto out;
 600         }
 601
 602         /* USB device */
 603         err = names_usb(dev, &names);
 604         if (err >= 0 && names.type == NET_USB) {
 605                 char str[IFNAMSIZ];
 606
 607                 if (names.pci_path[0])
 608                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.usb_ports) < (int)sizeof(str))
 609                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 610
 611                 if (names.pci_slot[0])
 612                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.usb_ports) < (int)sizeof(str))
 613                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 614                 goto out;
 615         }
 616
 617         /* Broadcom bus */
 618         err = names_bcma(dev, &names);
 619         if (err >= 0 && names.type == NET_BCMA) {
 620                 char str[IFNAMSIZ];
 621
 622                 if (names.pci_path[0])
 623                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.bcma_core) < (int)sizeof(str))
 624                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 625
 626                 if (names.pci_slot[0])
 627                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.bcma_core) < (int)sizeof(str))
 628                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 629                 goto out;
 630         }
 631 out:
 632         return EXIT_SUCCESS;
 633 }
 634
 635 const struct udev_builtin udev_builtin_net_id = {
 636         .name = "net_id",
 637         .cmd = builtin_net_id,
 638         .help = "Network device properties",
 639 };