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>                             — bus id of a grouped CCW or CCW device,
  38  *                                           with all leading zeros stripped [s390]
  39  *   o<index>[n<phys_port_name>|d<dev_port>]
  40  *                                         — on-board device index number
  41  *   s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
  42  *                                         — hotplug slot index number
  43  *   x<MAC>                                — MAC address
  44  *   [P<domain>]p<bus>s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
  45  *                                         — PCI geographical location
  46  *   [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
  47  *                                         — USB port number chain
  48  *   v<slot>                               - VIO slot number (IBM PowerVM)
  49  *   a<vendor><model>i<instance>           — Platform bus ACPI instance id
  50  *
  51  * All multi-function PCI devices will carry the [f<function>] number in the
  52  * device name, including the function 0 device.
  53  *
  54  * When using PCI geography, The PCI domain is only prepended when it is not 0.
  55  *
  56  * For USB devices the full chain of port numbers of hubs is composed. If the
  57  * name gets longer than the maximum number of 15 characters, the name is not
  58  * exported.
  59  * The usual USB configuration == 1 and interface == 0 values are suppressed.
  60  *
  61  * PCI Ethernet card with firmware index "1":
  62  *   ID_NET_NAME_ONBOARD=eno1
  63  *   ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1
  64  *
  65  * PCI Ethernet card in hotplug slot with firmware index number:
  66  *   /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1
  67  *   ID_NET_NAME_MAC=enx000000000466
  68  *   ID_NET_NAME_PATH=enp5s0
  69  *   ID_NET_NAME_SLOT=ens1
  70  *
  71  * PCI Ethernet multi-function card with 2 ports:
  72  *   /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/enp2s0f0
  73  *   ID_NET_NAME_MAC=enx78e7d1ea46da
  74  *   ID_NET_NAME_PATH=enp2s0f0
  75  *   /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.1/net/enp2s0f1
  76  *   ID_NET_NAME_MAC=enx78e7d1ea46dc
  77  *   ID_NET_NAME_PATH=enp2s0f1
  78  *
  79  * PCI wlan card:
  80  *   /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlp3s0
  81  *   ID_NET_NAME_MAC=wlx0024d7e31130
  82  *   ID_NET_NAME_PATH=wlp3s0
  83  *
  84  * USB built-in 3G modem:
  85  *   /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.6/net/wwp0s29u1u4i6
  86  *   ID_NET_NAME_MAC=wwx028037ec0200
  87  *   ID_NET_NAME_PATH=wwp0s29u1u4i6
  88  *
  89  * USB Android phone:
  90  *   /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/net/enp0s29u1u2
  91  *   ID_NET_NAME_MAC=enxd626b3450fb5
  92  *   ID_NET_NAME_PATH=enp0s29u1u2
  93  *
  94  * s390 grouped CCW interface:
  95  *  /sys/devices/css0/0.0.0007/0.0.f5f0/group_device/net/encf5f0
  96  *  ID_NET_NAME_MAC=enx026d3c00000a
  97  *  ID_NET_NAME_PATH=encf5f0
  98  */
  99
 100 #include <errno.h>
 101 #include <fcntl.h>
 102 #include <net/if.h>
 103 #include <net/if_arp.h>
 104 #include <stdarg.h>
 105 #include <stdio.h>
 106 #include <stdlib.h>
 107 #include <string.h>
 108 #include <unistd.h>
 109 #include <linux/pci_regs.h>
 110
 111 #include "dirent-util.h"
 112 #include "fd-util.h"
 113 #include "fileio.h"
 114 #include "stdio-util.h"
 115 #include "string-util.h"
 116 #include "udev.h"
 117
 118 #define ONBOARD_INDEX_MAX (16*1024-1)
 119
 120 enum netname_type{
 121         NET_UNDEF,
 122         NET_PCI,
 123         NET_USB,
 124         NET_BCMA,
 125         NET_VIRTIO,
 126         NET_CCW,
 127         NET_VIO,
 128         NET_PLATFORM,
 129 };
 130
 131 struct netnames {
 132         enum netname_type type;
 133
 134         uint8_t mac[6];
 135         bool mac_valid;
 136
 137         struct udev_device *pcidev;
 138         char pci_slot[IFNAMSIZ];
 139         char pci_path[IFNAMSIZ];
 140         char pci_onboard[IFNAMSIZ];
 141         const char *pci_onboard_label;
 142
 143         char usb_ports[IFNAMSIZ];
 144         char bcma_core[IFNAMSIZ];
 145         char ccw_busid[IFNAMSIZ];
 146         char vio_slot[IFNAMSIZ];
 147         char platform_path[IFNAMSIZ];
 148 };
 149
 150 /* skip intermediate virtio devices */
 151 static struct udev_device *skip_virtio(struct udev_device *dev) {
 152         struct udev_device *parent = dev;
 153
 154         /* there can only ever be one virtio bus per parent device, so we can
 155            safely ignore any virtio buses. see
 156            <http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html> */
 157         while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
 158                 parent = udev_device_get_parent(parent);
 159         return parent;
 160 }
 161
 162 /* retrieve on-board index number and label from firmware */
 163 static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
 164         unsigned dev_port = 0;
 165         size_t l;
 166         char *s;
 167         const char *attr, *port_name;
 168         int idx;
 169
 170         /* ACPI _DSM  — device specific method for naming a PCI or PCI Express device */
 171         attr = udev_device_get_sysattr_value(names->pcidev, "acpi_index");
 172         /* SMBIOS type 41 — Onboard Devices Extended Information */
 173         if (!attr)
 174                 attr = udev_device_get_sysattr_value(names->pcidev, "index");
 175         if (!attr)
 176                 return -ENOENT;
 177
 178         idx = strtoul(attr, NULL, 0);
 179         if (idx <= 0)
 180                 return -EINVAL;
 181
 182         /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
 183          * example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
 184          * cut-off, which is somewhere beyond the realistic number of physical network interface a system might
 185          * have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
 186         if (idx > ONBOARD_INDEX_MAX)
 187                 return -ENOENT;
 188
 189         /* kernel provided port index for multiple ports on a single PCI function */
 190         attr = udev_device_get_sysattr_value(dev, "dev_port");
 191         if (attr)
 192                 dev_port = strtol(attr, NULL, 10);
 193
 194         /* kernel provided front panel port name for multiple port PCI device */
 195         port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
 196
 197         s = names->pci_onboard;
 198         l = sizeof(names->pci_onboard);
 199         l = strpcpyf(&s, l, "o%d", idx);
 200         if (port_name)
 201                 l = strpcpyf(&s, l, "n%s", port_name);
 202         else if (dev_port > 0)
 203                 l = strpcpyf(&s, l, "d%d", dev_port);
 204         if (l == 0)
 205                 names->pci_onboard[0] = '\0';
 206
 207         names->pci_onboard_label = udev_device_get_sysattr_value(names->pcidev, "label");
 208
 209         return 0;
 210 }
 211
 212 /* read the 256 bytes PCI configuration space to check the multi-function bit */
 213 static bool is_pci_multifunction(struct udev_device *dev) {
 214         _cleanup_close_ int fd = -1;
 215         const char *filename;
 216         uint8_t config[64];
 217
 218         filename = strjoina(udev_device_get_syspath(dev), "/config");
 219         fd = open(filename, O_RDONLY | O_CLOEXEC);
 220         if (fd < 0)
 221                 return false;
 222         if (read(fd, &config, sizeof(config)) != sizeof(config))
 223                 return false;
 224
 225         /* bit 0-6 header type, bit 7 multi/single function device */
 226         if ((config[PCI_HEADER_TYPE] & 0x80) != 0)
 227                 return true;
 228
 229         return false;
 230 }
 231
 232 static int dev_pci_slot(struct udev_device *dev, struct netnames *names) {
 233         struct udev *udev = udev_device_get_udev(names->pcidev);
 234         unsigned domain, bus, slot, func, dev_port = 0;
 235         size_t l;
 236         char *s;
 237         const char *attr, *port_name;
 238         struct udev_device *pci = NULL;
 239         char slots[PATH_MAX];
 240         _cleanup_closedir_ DIR *dir = NULL;
 241         struct dirent *dent;
 242         int hotplug_slot = 0, err = 0;
 243
 244         if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
 245                 return -ENOENT;
 246
 247         /* kernel provided port index for multiple ports on a single PCI function */
 248         attr = udev_device_get_sysattr_value(dev, "dev_port");
 249         if (attr)
 250                 dev_port = strtol(attr, NULL, 10);
 251
 252         /* kernel provided front panel port name for multiple port PCI device */
 253         port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
 254
 255         /* compose a name based on the raw kernel's PCI bus, slot numbers */
 256         s = names->pci_path;
 257         l = sizeof(names->pci_path);
 258         if (domain > 0)
 259                 l = strpcpyf(&s, l, "P%u", domain);
 260         l = strpcpyf(&s, l, "p%us%u", bus, slot);
 261         if (func > 0 || is_pci_multifunction(names->pcidev))
 262                 l = strpcpyf(&s, l, "f%u", func);
 263         if (port_name)
 264                 l = strpcpyf(&s, l, "n%s", port_name);
 265         else if (dev_port > 0)
 266                 l = strpcpyf(&s, l, "d%u", dev_port);
 267         if (l == 0)
 268                 names->pci_path[0] = '\0';
 269
 270         /* ACPI _SUN  — slot user number */
 271         pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
 272         if (!pci) {
 273                 err = -ENOENT;
 274                 goto out;
 275         }
 276
 277         snprintf(slots, sizeof slots, "%s/slots", udev_device_get_syspath(pci));
 278         dir = opendir(slots);
 279         if (!dir) {
 280                 err = -errno;
 281                 goto out;
 282         }
 283
 284         FOREACH_DIRENT_ALL(dent, dir, break) {
 285                 int i;
 286                 char *rest, *address, str[PATH_MAX];
 287
 288                 if (dent->d_name[0] == '.')
 289                         continue;
 290                 i = strtol(dent->d_name, &rest, 10);
 291                 if (rest[0] != '\0')
 292                         continue;
 293                 if (i < 1)
 294                         continue;
 295
 296                 snprintf(str, sizeof str, "%s/%s/address", slots, dent->d_name);
 297                 if (read_one_line_file(str, &address) >= 0) {
 298                         /* match slot address with device by stripping the function */
 299                         if (strneq(address, udev_device_get_sysname(names->pcidev), strlen(address)))
 300                                 hotplug_slot = i;
 301                         free(address);
 302                 }
 303
 304                 if (hotplug_slot > 0)
 305                         break;
 306         }
 307
 308         if (hotplug_slot > 0) {
 309                 s = names->pci_slot;
 310                 l = sizeof(names->pci_slot);
 311                 if (domain > 0)
 312                         l = strpcpyf(&s, l, "P%d", domain);
 313                 l = strpcpyf(&s, l, "s%d", hotplug_slot);
 314                 if (func > 0 || is_pci_multifunction(names->pcidev))
 315                         l = strpcpyf(&s, l, "f%d", func);
 316                 if (port_name)
 317                         l = strpcpyf(&s, l, "n%s", port_name);
 318                 else if (dev_port > 0)
 319                         l = strpcpyf(&s, l, "d%d", dev_port);
 320                 if (l == 0)
 321                         names->pci_slot[0] = '\0';
 322         }
 323 out:
 324         udev_device_unref(pci);
 325         return err;
 326 }
 327
 328 static int names_vio(struct udev_device *dev, struct netnames *names) {
 329         struct udev_device *parent;
 330         unsigned busid, slotid, ethid;
 331         const char *syspath;
 332
 333         /* check if our direct parent is a VIO device with no other bus in-between */
 334         parent = udev_device_get_parent(dev);
 335         if (!parent)
 336                 return -ENOENT;
 337
 338         if (!streq_ptr("vio", udev_device_get_subsystem(parent)))
 339                  return -ENOENT;
 340
 341         /* The devices' $DEVPATH number is tied to (virtual) hardware (slot id
 342          * selected in the HMC), thus this provides a reliable naming (e.g.
 343          * "/devices/vio/30000002/net/eth1"); we ignore the bus number, as
 344          * there should only ever be one bus, and then remove leading zeros. */
 345         syspath = udev_device_get_syspath(dev);
 346
 347         if (sscanf(syspath, "/sys/devices/vio/%4x%4x/net/eth%u", &busid, &slotid, &ethid) != 3)
 348                 return -EINVAL;
 349
 350         xsprintf(names->vio_slot, "v%u", slotid);
 351         names->type = NET_VIO;
 352         return 0;
 353 }
 354
 355 #define _PLATFORM_TEST "/sys/devices/platform/vvvvPPPP"
 356 #define _PLATFORM_PATTERN4 "/sys/devices/platform/%4s%4x:%2x/net/eth%u"
 357 #define _PLATFORM_PATTERN3 "/sys/devices/platform/%3s%4x:%2x/net/eth%u"
 358
 359 static int names_platform(struct udev_device *dev, struct netnames *names, bool test) {
 360         struct udev_device *parent;
 361         char vendor[5];
 362         unsigned model, instance, ethid;
 363         const char *syspath, *pattern, *validchars;
 364
 365         /* check if our direct parent is a platform device with no other bus in-between */
 366         parent = udev_device_get_parent(dev);
 367         if (!parent)
 368                 return -ENOENT;
 369
 370         if (!streq_ptr("platform", udev_device_get_subsystem(parent)))
 371                  return -ENOENT;
 372
 373         syspath = udev_device_get_syspath(dev);
 374
 375         /* syspath is too short, to have a valid ACPI instance */
 376         if (strlen(syspath) < sizeof _PLATFORM_TEST)
 377                 return -EINVAL;
 378
 379         /* Vendor ID can be either PNP ID (3 chars A-Z) or ACPI ID (4 chars A-Z and numerals) */
 380         if (syspath[sizeof _PLATFORM_TEST - 1] == ':') {
 381                 pattern = _PLATFORM_PATTERN4;
 382                 validchars = UPPERCASE_LETTERS DIGITS;
 383         } else {
 384                 pattern = _PLATFORM_PATTERN3;
 385                 validchars = UPPERCASE_LETTERS;
 386         }
 387
 388         /* Platform devices are named after ACPI table match, and instance id
 389          * eg. "/sys/devices/platform/HISI00C2:00");
 390          * The Vendor (3 or 4 char), followed by hexdecimal model number : instance id.
 391          */
 392
 393 #pragma GCC diagnostic push
 394 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
 395         if (sscanf(syspath, pattern, vendor, &model, &instance, &ethid) != 4)
 396                 return -EINVAL;
 397 #pragma GCC diagnostic pop
 398
 399         if (!in_charset(vendor, validchars))
 400                 return -ENOENT;
 401
 402         ascii_strlower(vendor);
 403
 404         xsprintf(names->platform_path, "a%s%xi%u", vendor, model, instance);
 405         names->type = NET_PLATFORM;
 406         return 0;
 407 }
 408
 409 static int names_pci(struct udev_device *dev, struct netnames *names) {
 410         struct udev_device *parent;
 411
 412         assert(dev);
 413         assert(names);
 414
 415         parent = udev_device_get_parent(dev);
 416         /* skip virtio subsystem if present */
 417         parent = skip_virtio(parent);
 418
 419         if (!parent)
 420                 return -ENOENT;
 421
 422         /* check if our direct parent is a PCI device with no other bus in-between */
 423         if (streq_ptr("pci", udev_device_get_subsystem(parent))) {
 424                 names->type = NET_PCI;
 425                 names->pcidev = parent;
 426         } else {
 427                 names->pcidev = udev_device_get_parent_with_subsystem_devtype(dev, "pci", NULL);
 428                 if (!names->pcidev)
 429                         return -ENOENT;
 430         }
 431         dev_pci_onboard(dev, names);
 432         dev_pci_slot(dev, names);
 433         return 0;
 434 }
 435
 436 static int names_usb(struct udev_device *dev, struct netnames *names) {
 437         struct udev_device *usbdev;
 438         char name[256];
 439         char *ports;
 440         char *config;
 441         char *interf;
 442         size_t l;
 443         char *s;
 444
 445         assert(dev);
 446         assert(names);
 447
 448         usbdev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
 449         if (!usbdev)
 450                 return -ENOENT;
 451
 452         /* get USB port number chain, configuration, interface */
 453         strscpy(name, sizeof(name), udev_device_get_sysname(usbdev));
 454         s = strchr(name, '-');
 455         if (!s)
 456                 return -EINVAL;
 457         ports = s+1;
 458
 459         s = strchr(ports, ':');
 460         if (!s)
 461                 return -EINVAL;
 462         s[0] = '\0';
 463         config = s+1;
 464
 465         s = strchr(config, '.');
 466         if (!s)
 467                 return -EINVAL;
 468         s[0] = '\0';
 469         interf = s+1;
 470
 471         /* prefix every port number in the chain with "u" */
 472         s = ports;
 473         while ((s = strchr(s, '.')))
 474                 s[0] = 'u';
 475         s = names->usb_ports;
 476         l = strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL);
 477
 478         /* append USB config number, suppress the common config == 1 */
 479         if (!streq(config, "1"))
 480                 l = strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL);
 481
 482         /* append USB interface number, suppress the interface == 0 */
 483         if (!streq(interf, "0"))
 484                 l = strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL);
 485         if (l == 0)
 486                 return -ENAMETOOLONG;
 487
 488         names->type = NET_USB;
 489         return 0;
 490 }
 491
 492 static int names_bcma(struct udev_device *dev, struct netnames *names) {
 493         struct udev_device *bcmadev;
 494         unsigned int core;
 495
 496         assert(dev);
 497         assert(names);
 498
 499         bcmadev = udev_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL);
 500         if (!bcmadev)
 501                 return -ENOENT;
 502
 503         /* bus num:core num */
 504         if (sscanf(udev_device_get_sysname(bcmadev), "bcma%*u:%u", &core) != 1)
 505                 return -EINVAL;
 506         /* suppress the common core == 0 */
 507         if (core > 0)
 508                 xsprintf(names->bcma_core, "b%u", core);
 509
 510         names->type = NET_BCMA;
 511         return 0;
 512 }
 513
 514 static int names_ccw(struct  udev_device *dev, struct netnames *names) {
 515         struct udev_device *cdev;
 516         const char *bus_id, *subsys;
 517         size_t bus_id_len;
 518         size_t bus_id_start;
 519         int rc;
 520
 521         assert(dev);
 522         assert(names);
 523
 524         /* Retrieve the associated CCW device */
 525         cdev = udev_device_get_parent(dev);
 526         /* skip virtio subsystem if present */
 527         cdev = skip_virtio(cdev);
 528         if (!cdev)
 529                 return -ENOENT;
 530
 531         /* Network devices are either single or grouped CCW devices */
 532         subsys = udev_device_get_subsystem(cdev);
 533         if (!STRPTR_IN_SET(subsys, "ccwgroup", "ccw"))
 534                 return -ENOENT;
 535
 536         /* Retrieve bus-ID of the CCW device.  The bus-ID uniquely
 537          * identifies the network device on the Linux on System z channel
 538          * subsystem.  Note that the bus-ID contains lowercase characters.
 539          */
 540         bus_id = udev_device_get_sysname(cdev);
 541         if (!bus_id)
 542                 return -ENOENT;
 543
 544         /* Check the length of the bus-ID.  Rely on that the kernel provides
 545          * a correct bus-ID; alternatively, improve this check and parse and
 546          * verify each bus-ID part...
 547          */
 548         bus_id_len = strlen(bus_id);
 549         if (!bus_id_len || bus_id_len < 8 || bus_id_len > 9)
 550                 return -EINVAL;
 551
 552         /* Strip leading zeros from the bus id for aesthetic purposes. This
 553          * keeps the ccw names stable, yet much shorter in general case of
 554          * bus_id 0.0.0600 -> 600. This is similar to e.g. how PCI domain is
 555          * not prepended when it is zero. Preserve the last 0 for 0.0.0000.
 556          */
 557         bus_id_start = strspn(bus_id, ".0");
 558         bus_id += bus_id_start < bus_id_len ? bus_id_start : bus_id_len - 1;
 559
 560         /* Store the CCW bus-ID for use as network device name */
 561         rc = snprintf(names->ccw_busid, sizeof(names->ccw_busid), "c%s", bus_id);
 562         if (rc >= 0 && rc < (int)sizeof(names->ccw_busid))
 563                 names->type = NET_CCW;
 564         return 0;
 565 }
 566
 567 static int names_mac(struct udev_device *dev, struct netnames *names) {
 568         const char *s;
 569         unsigned int i;
 570         unsigned int a1, a2, a3, a4, a5, a6;
 571
 572         /* check for NET_ADDR_PERM, skip random MAC addresses */
 573         s = udev_device_get_sysattr_value(dev, "addr_assign_type");
 574         if (!s)
 575                 return EXIT_FAILURE;
 576         i = strtoul(s, NULL, 0);
 577         if (i != 0)
 578                 return 0;
 579
 580         s = udev_device_get_sysattr_value(dev, "address");
 581         if (!s)
 582                 return -ENOENT;
 583         if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
 584                 return -EINVAL;
 585
 586         /* skip empty MAC addresses */
 587         if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
 588                 return -EINVAL;
 589
 590         names->mac[0] = a1;
 591         names->mac[1] = a2;
 592         names->mac[2] = a3;
 593         names->mac[3] = a4;
 594         names->mac[4] = a5;
 595         names->mac[5] = a6;
 596         names->mac_valid = true;
 597         return 0;
 598 }
 599
 600 /* IEEE Organizationally Unique Identifier vendor string */
 601 static int ieee_oui(struct udev_device *dev, struct netnames *names, bool test) {
 602         char str[32];
 603
 604         if (!names->mac_valid)
 605                 return -ENOENT;
 606         /* skip commonly misused 00:00:00 (Xerox) prefix */
 607         if (memcmp(names->mac, "\0\0\0", 3) == 0)
 608                 return -EINVAL;
 609         xsprintf(str, "OUI:%02X%02X%02X%02X%02X%02X", names->mac[0],
 610                  names->mac[1], names->mac[2], names->mac[3], names->mac[4],
 611                  names->mac[5]);
 612         udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test);
 613         return 0;
 614 }
 615
 616 static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
 617         const char *s;
 618         const char *p;
 619         unsigned int i;
 620         const char *devtype;
 621         const char *prefix = "en";
 622         struct netnames names = {};
 623         int err;
 624
 625         /* handle only ARPHRD_ETHER and ARPHRD_SLIP devices */
 626         s = udev_device_get_sysattr_value(dev, "type");
 627         if (!s)
 628                 return EXIT_FAILURE;
 629         i = strtoul(s, NULL, 0);
 630         switch (i) {
 631         case ARPHRD_ETHER:
 632                 prefix = "en";
 633                 break;
 634         case ARPHRD_SLIP:
 635                 prefix = "sl";
 636                 break;
 637         default:
 638                 return 0;
 639         }
 640
 641         /* skip stacked devices, like VLANs, ... */
 642         s = udev_device_get_sysattr_value(dev, "ifindex");
 643         if (!s)
 644                 return EXIT_FAILURE;
 645         p = udev_device_get_sysattr_value(dev, "iflink");
 646         if (!p)
 647                 return EXIT_FAILURE;
 648         if (!streq(s, p))
 649                 return 0;
 650
 651         devtype = udev_device_get_devtype(dev);
 652         if (devtype) {
 653                 if (streq("wlan", devtype))
 654                         prefix = "wl";
 655                 else if (streq("wwan", devtype))
 656                         prefix = "ww";
 657         }
 658
 659         err = names_mac(dev, &names);
 660         if (err >= 0 && names.mac_valid) {
 661                 char str[IFNAMSIZ];
 662
 663                 xsprintf(str, "%sx%02x%02x%02x%02x%02x%02x", prefix,
 664                          names.mac[0], names.mac[1], names.mac[2],
 665                          names.mac[3], names.mac[4], names.mac[5]);
 666                 udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
 667
 668                 ieee_oui(dev, &names, test);
 669         }
 670
 671         /* get path names for Linux on System z network devices */
 672         err = names_ccw(dev, &names);
 673         if (err >= 0 && names.type == NET_CCW) {
 674                 char str[IFNAMSIZ];
 675
 676                 if (snprintf(str, sizeof(str), "%s%s", prefix, names.ccw_busid) < (int)sizeof(str))
 677                         udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 678                 goto out;
 679         }
 680
 681         /* get ibmveth/ibmvnic slot-based names. */
 682         err = names_vio(dev, &names);
 683         if (err >= 0 && names.type == NET_VIO) {
 684                 char str[IFNAMSIZ];
 685
 686                 if (snprintf(str, sizeof(str), "%s%s", prefix, names.vio_slot) < (int)sizeof(str))
 687                         udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 688                 goto out;
 689         }
 690
 691         /* get ACPI path names for ARM64 platform devices */
 692         err = names_platform(dev, &names, test);
 693         if (err >= 0 && names.type == NET_PLATFORM) {
 694                 char str[IFNAMSIZ];
 695
 696                 if (snprintf(str, sizeof(str), "%s%s", prefix, names.platform_path) < (int)sizeof(str))
 697                         udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 698                 goto out;
 699         }
 700
 701         /* get PCI based path names, we compose only PCI based paths */
 702         err = names_pci(dev, &names);
 703         if (err < 0)
 704                 goto out;
 705
 706         /* plain PCI device */
 707         if (names.type == NET_PCI) {
 708                 char str[IFNAMSIZ];
 709
 710                 if (names.pci_onboard[0])
 711                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard) < (int)sizeof(str))
 712                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);
 713
 714                 if (names.pci_onboard_label)
 715                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard_label) < (int)sizeof(str))
 716                                 udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str);
 717
 718                 if (names.pci_path[0])
 719                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_path) < (int)sizeof(str))
 720                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 721
 722                 if (names.pci_slot[0])
 723                         if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_slot) < (int)sizeof(str))
 724                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 725                 goto out;
 726         }
 727
 728         /* USB device */
 729         err = names_usb(dev, &names);
 730         if (err >= 0 && names.type == NET_USB) {
 731                 char str[IFNAMSIZ];
 732
 733                 if (names.pci_path[0])
 734                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.usb_ports) < (int)sizeof(str))
 735                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 736
 737                 if (names.pci_slot[0])
 738                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.usb_ports) < (int)sizeof(str))
 739                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 740                 goto out;
 741         }
 742
 743         /* Broadcom bus */
 744         err = names_bcma(dev, &names);
 745         if (err >= 0 && names.type == NET_BCMA) {
 746                 char str[IFNAMSIZ];
 747
 748                 if (names.pci_path[0])
 749                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.bcma_core) < (int)sizeof(str))
 750                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
 751
 752                 if (names.pci_slot[0])
 753                         if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.bcma_core) < (int)sizeof(str))
 754                                 udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
 755                 goto out;
 756         }
 757 out:
 758         return EXIT_SUCCESS;
 759 }
 760
 761 const struct udev_builtin udev_builtin_net_id = {
 762         .name = "net_id",
 763         .cmd = builtin_net_id,
 764         .help = "Network device properties",
 765 };