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/* SPDX-License-Identifier: LGPL-2.1+ */
/*
* Predictable network interface device names based on:
* - firmware/bios-provided index numbers for on-board devices
* - firmware-provided pci-express hotplug slot index number
* - physical/geographical location of the hardware
* - the interface's MAC address
*
* http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames
*
* Two character prefixes based on the type of interface:
* en β€” Ethernet
* sl β€” serial line IP (slip)
* wl β€” wlan
* ww β€” wwan
*
* Type of names:
* b<number> β€” BCMA bus core number
* c<bus_id> β€” bus id of a grouped CCW or CCW device,
* with all leading zeros stripped [s390]
* o<index>[n<phys_port_name>|d<dev_port>]
* β€” on-board device index number
* s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
* β€” hotplug slot index number
* x<MAC> β€” MAC address
* [P<domain>]p<bus>s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
* β€” PCI geographical location
* [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
* β€” USB port number chain
* v<slot> - VIO slot number (IBM PowerVM)
* a<vendor><model>i<instance> β€” Platform bus ACPI instance id
*
* All multi-function PCI devices will carry the [f<function>] number in the
* device name, including the function 0 device.
*
* SR-IOV virtual devices are named based on the name of the parent interface,
* with a suffix of "v<N>", where <N> is the virtual device number.
*
* When using PCI geography, The PCI domain is only prepended when it is not 0.
*
* For USB devices the full chain of port numbers of hubs is composed. If the
* name gets longer than the maximum number of 15 characters, the name is not
* exported.
* The usual USB configuration == 1 and interface == 0 values are suppressed.
*
* PCI Ethernet card with firmware index "1":
* ID_NET_NAME_ONBOARD=eno1
* ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1
*
* PCI Ethernet card in hotplug slot with firmware index number:
* /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1
* ID_NET_NAME_MAC=enx000000000466
* ID_NET_NAME_PATH=enp5s0
* ID_NET_NAME_SLOT=ens1
*
* PCI Ethernet multi-function card with 2 ports:
* /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/enp2s0f0
* ID_NET_NAME_MAC=enx78e7d1ea46da
* ID_NET_NAME_PATH=enp2s0f0
* /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.1/net/enp2s0f1
* ID_NET_NAME_MAC=enx78e7d1ea46dc
* ID_NET_NAME_PATH=enp2s0f1
*
* PCI wlan card:
* /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlp3s0
* ID_NET_NAME_MAC=wlx0024d7e31130
* ID_NET_NAME_PATH=wlp3s0
*
* USB built-in 3G modem:
* /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.6/net/wwp0s29u1u4i6
* ID_NET_NAME_MAC=wwx028037ec0200
* ID_NET_NAME_PATH=wwp0s29u1u4i6
*
* USB Android phone:
* /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/net/enp0s29u1u2
* ID_NET_NAME_MAC=enxd626b3450fb5
* ID_NET_NAME_PATH=enp0s29u1u2
*
* s390 grouped CCW interface:
* /sys/devices/css0/0.0.0007/0.0.f5f0/group_device/net/encf5f0
* ID_NET_NAME_MAC=enx026d3c00000a
* ID_NET_NAME_PATH=encf5f0
*/
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/pci_regs.h>
#include "dirent-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "parse-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "udev.h"
#include "udev-util.h"
#define ONBOARD_INDEX_MAX (16*1024-1)
enum netname_type{
NET_UNDEF,
NET_PCI,
NET_USB,
NET_BCMA,
NET_VIRTIO,
NET_CCW,
NET_VIO,
NET_PLATFORM,
};
struct netnames {
enum netname_type type;
uint8_t mac[6];
bool mac_valid;
struct udev_device *pcidev;
char pci_slot[IFNAMSIZ];
char pci_path[IFNAMSIZ];
char pci_onboard[IFNAMSIZ];
const char *pci_onboard_label;
char usb_ports[IFNAMSIZ];
char bcma_core[IFNAMSIZ];
char ccw_busid[IFNAMSIZ];
char vio_slot[IFNAMSIZ];
char platform_path[IFNAMSIZ];
};
struct virtfn_info {
struct udev_device *physfn_pcidev;
char suffix[IFNAMSIZ];
};
/* skip intermediate virtio devices */
static struct udev_device *skip_virtio(struct udev_device *dev) {
struct udev_device *parent = dev;
/* there can only ever be one virtio bus per parent device, so we can
safely ignore any virtio buses. see
<http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html> */
while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
parent = udev_device_get_parent(parent);
return parent;
}
static int get_virtfn_info(struct udev_device *dev, struct netnames *names, struct virtfn_info *vf_info) {
struct udev *udev;
const char *physfn_link_file;
_cleanup_free_ char *physfn_pci_syspath = NULL;
_cleanup_free_ char *virtfn_pci_syspath = NULL;
struct dirent *dent;
_cleanup_closedir_ DIR *dir = NULL;
struct virtfn_info vf_info_local = {};
int r;
udev = udev_device_get_udev(names->pcidev);
if (!udev)
return -ENOENT;
/* Check if this is a virtual function. */
physfn_link_file = strjoina(udev_device_get_syspath(names->pcidev), "/physfn");
r = chase_symlinks(physfn_link_file, NULL, 0, &physfn_pci_syspath);
if (r < 0)
return r;
/* Get physical function's pci device. */
vf_info_local.physfn_pcidev = udev_device_new_from_syspath(udev, physfn_pci_syspath);
if (!vf_info_local.physfn_pcidev)
return -ENOENT;
/* Find the virtual function number by finding the right virtfn link. */
dir = opendir(physfn_pci_syspath);
if (!dir) {
r = -errno;
goto out_unref;
}
FOREACH_DIRENT_ALL(dent, dir, break) {
_cleanup_free_ char *virtfn_link_file = NULL;
if (!startswith(dent->d_name, "virtfn"))
continue;
virtfn_link_file = strjoin(physfn_pci_syspath, "/", dent->d_name);
if (!virtfn_link_file) {
r = -ENOMEM;
goto out_unref;
}
if (chase_symlinks(virtfn_link_file, NULL, 0, &virtfn_pci_syspath) < 0)
continue;
if (streq(udev_device_get_syspath(names->pcidev), virtfn_pci_syspath)) {
if (!snprintf_ok(vf_info_local.suffix, sizeof(vf_info_local.suffix), "v%s", &dent->d_name[6])) {
r = -ENOENT;
goto out_unref;
}
break;
}
}
if (isempty(vf_info_local.suffix)) {
r = -ENOENT;
goto out_unref;
}
*vf_info = vf_info_local;
return 0;
out_unref:
udev_device_unref(vf_info_local.physfn_pcidev);
return r;
}
/* retrieve on-board index number and label from firmware */
static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
unsigned dev_port = 0;
size_t l;
char *s;
const char *attr, *port_name;
int idx;
/* ACPI _DSM β€” device specific method for naming a PCI or PCI Express device */
attr = udev_device_get_sysattr_value(names->pcidev, "acpi_index");
/* SMBIOS type 41 β€” Onboard Devices Extended Information */
if (!attr)
attr = udev_device_get_sysattr_value(names->pcidev, "index");
if (!attr)
return -ENOENT;
idx = strtoul(attr, NULL, 0);
if (idx <= 0)
return -EINVAL;
/* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
* example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
* cut-off, which is somewhere beyond the realistic number of physical network interface a system might
* have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
if (idx > ONBOARD_INDEX_MAX)
return -ENOENT;
/* kernel provided port index for multiple ports on a single PCI function */
attr = udev_device_get_sysattr_value(dev, "dev_port");
if (attr)
dev_port = strtol(attr, NULL, 10);
/* kernel provided front panel port name for multiple port PCI device */
port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
s = names->pci_onboard;
l = sizeof(names->pci_onboard);
l = strpcpyf(&s, l, "o%d", idx);
if (port_name)
l = strpcpyf(&s, l, "n%s", port_name);
else if (dev_port > 0)
l = strpcpyf(&s, l, "d%d", dev_port);
if (l == 0)
names->pci_onboard[0] = '\0';
names->pci_onboard_label = udev_device_get_sysattr_value(names->pcidev, "label");
return 0;
}
/* read the 256 bytes PCI configuration space to check the multi-function bit */
static bool is_pci_multifunction(struct udev_device *dev) {
_cleanup_close_ int fd = -1;
const char *filename;
uint8_t config[64];
filename = strjoina(udev_device_get_syspath(dev), "/config");
fd = open(filename, O_RDONLY | O_CLOEXEC);
if (fd < 0)
return false;
if (read(fd, &config, sizeof(config)) != sizeof(config))
return false;
/* bit 0-6 header type, bit 7 multi/single function device */
if ((config[PCI_HEADER_TYPE] & 0x80) != 0)
return true;
return false;
}
static bool is_pci_ari_enabled(struct udev_device *dev) {
return streq_ptr(udev_device_get_sysattr_value(dev, "ari_enabled"), "1");
}
static int dev_pci_slot(struct udev_device *dev, struct netnames *names) {
struct udev *udev = udev_device_get_udev(names->pcidev);
unsigned domain, bus, slot, func, dev_port = 0, hotplug_slot = 0;
size_t l;
char *s;
const char *attr, *port_name;
_cleanup_(udev_device_unrefp) struct udev_device *pci = NULL;
struct udev_device *hotplug_slot_dev;
char slots[PATH_MAX];
_cleanup_closedir_ DIR *dir = NULL;
struct dirent *dent;
if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
return -ENOENT;
if (is_pci_ari_enabled(names->pcidev))
/* ARI devices support up to 256 functions on a single device ("slot"), and interpret the
* traditional 5-bit slot and 3-bit function number as a single 8-bit function number,
* where the slot makes up the upper 5 bits. */
func += slot * 8;
/* kernel provided port index for multiple ports on a single PCI function */
attr = udev_device_get_sysattr_value(dev, "dev_port");
if (attr)
dev_port = strtol(attr, NULL, 10);
/* kernel provided front panel port name for multiple port PCI device */
port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
/* compose a name based on the raw kernel's PCI bus, slot numbers */
s = names->pci_path;
l = sizeof(names->pci_path);
if (domain > 0)
l = strpcpyf(&s, l, "P%u", domain);
l = strpcpyf(&s, l, "p%us%u", bus, slot);
if (func > 0 || is_pci_multifunction(names->pcidev))
l = strpcpyf(&s, l, "f%u", func);
if (port_name)
l = strpcpyf(&s, l, "n%s", port_name);
else if (dev_port > 0)
l = strpcpyf(&s, l, "d%u", dev_port);
if (l == 0)
names->pci_path[0] = '\0';
/* ACPI _SUN β€” slot user number */
pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
if (!pci)
return -ENOENT;
if (!snprintf_ok(slots, sizeof slots, "%s/slots", udev_device_get_syspath(pci)))
return -ENAMETOOLONG;
dir = opendir(slots);
if (!dir)
return -errno;
hotplug_slot_dev = names->pcidev;
while (hotplug_slot_dev) {
FOREACH_DIRENT_ALL(dent, dir, break) {
unsigned i;
int r;
char str[PATH_MAX];
_cleanup_free_ char *address = NULL;
if (dent->d_name[0] == '.')
continue;
r = safe_atou_full(dent->d_name, 10, &i);
if (i < 1 || r < 0)
continue;
if (snprintf_ok(str, sizeof str, "%s/%s/address", slots, dent->d_name) &&
read_one_line_file(str, &address) >= 0)
/* match slot address with device by stripping the function */
if (startswith(udev_device_get_sysname(hotplug_slot_dev), address))
hotplug_slot = i;
if (hotplug_slot > 0)
break;
}
if (hotplug_slot > 0)
break;
rewinddir(dir);
hotplug_slot_dev = udev_device_get_parent_with_subsystem_devtype(hotplug_slot_dev, "pci", NULL);
}
if (hotplug_slot > 0) {
s = names->pci_slot;
l = sizeof(names->pci_slot);
if (domain > 0)
l = strpcpyf(&s, l, "P%d", domain);
l = strpcpyf(&s, l, "s%d", hotplug_slot);
if (func > 0 || is_pci_multifunction(names->pcidev))
l = strpcpyf(&s, l, "f%d", func);
if (port_name)
l = strpcpyf(&s, l, "n%s", port_name);
else if (dev_port > 0)
l = strpcpyf(&s, l, "d%d", dev_port);
if (l == 0)
names->pci_slot[0] = '\0';
}
return 0;
}
static int names_vio(struct udev_device *dev, struct netnames *names) {
struct udev_device *parent;
unsigned busid, slotid, ethid;
const char *syspath;
/* check if our direct parent is a VIO device with no other bus in-between */
parent = udev_device_get_parent(dev);
if (!parent)
return -ENOENT;
if (!streq_ptr("vio", udev_device_get_subsystem(parent)))
return -ENOENT;
/* The devices' $DEVPATH number is tied to (virtual) hardware (slot id
* selected in the HMC), thus this provides a reliable naming (e.g.
* "/devices/vio/30000002/net/eth1"); we ignore the bus number, as
* there should only ever be one bus, and then remove leading zeros. */
syspath = udev_device_get_syspath(dev);
if (sscanf(syspath, "/sys/devices/vio/%4x%4x/net/eth%u", &busid, &slotid, &ethid) != 3)
return -EINVAL;
xsprintf(names->vio_slot, "v%u", slotid);
names->type = NET_VIO;
return 0;
}
#define _PLATFORM_TEST "/sys/devices/platform/vvvvPPPP"
#define _PLATFORM_PATTERN4 "/sys/devices/platform/%4s%4x:%2x/net/eth%u"
#define _PLATFORM_PATTERN3 "/sys/devices/platform/%3s%4x:%2x/net/eth%u"
static int names_platform(struct udev_device *dev, struct netnames *names, bool test) {
struct udev_device *parent;
char vendor[5];
unsigned model, instance, ethid;
const char *syspath, *pattern, *validchars;
/* check if our direct parent is a platform device with no other bus in-between */
parent = udev_device_get_parent(dev);
if (!parent)
return -ENOENT;
if (!streq_ptr("platform", udev_device_get_subsystem(parent)))
return -ENOENT;
syspath = udev_device_get_syspath(dev);
/* syspath is too short, to have a valid ACPI instance */
if (strlen(syspath) < sizeof _PLATFORM_TEST)
return -EINVAL;
/* Vendor ID can be either PNP ID (3 chars A-Z) or ACPI ID (4 chars A-Z and numerals) */
if (syspath[sizeof _PLATFORM_TEST - 1] == ':') {
pattern = _PLATFORM_PATTERN4;
validchars = UPPERCASE_LETTERS DIGITS;
} else {
pattern = _PLATFORM_PATTERN3;
validchars = UPPERCASE_LETTERS;
}
/* Platform devices are named after ACPI table match, and instance id
* eg. "/sys/devices/platform/HISI00C2:00");
* The Vendor (3 or 4 char), followed by hexdecimal model number : instance id.
*/
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
if (sscanf(syspath, pattern, vendor, &model, &instance, &ethid) != 4)
return -EINVAL;
#pragma GCC diagnostic pop
if (!in_charset(vendor, validchars))
return -ENOENT;
ascii_strlower(vendor);
xsprintf(names->platform_path, "a%s%xi%u", vendor, model, instance);
names->type = NET_PLATFORM;
return 0;
}
static int names_pci(struct udev_device *dev, struct netnames *names) {
struct udev_device *parent;
struct netnames vf_names = {};
struct virtfn_info vf_info = {};
assert(dev);
assert(names);
parent = udev_device_get_parent(dev);
/* skip virtio subsystem if present */
parent = skip_virtio(parent);
if (!parent)
return -ENOENT;
/* check if our direct parent is a PCI device with no other bus in-between */
if (streq_ptr("pci", udev_device_get_subsystem(parent))) {
names->type = NET_PCI;
names->pcidev = parent;
} else {
names->pcidev = udev_device_get_parent_with_subsystem_devtype(dev, "pci", NULL);
if (!names->pcidev)
return -ENOENT;
}
if (get_virtfn_info(dev, names, &vf_info) >= 0) {
/* If this is an SR-IOV virtual device, get base name using physical device and add virtfn suffix. */
vf_names.pcidev = vf_info.physfn_pcidev;
dev_pci_onboard(dev, &vf_names);
dev_pci_slot(dev, &vf_names);
if (vf_names.pci_onboard[0])
if (strlen(vf_names.pci_onboard) + strlen(vf_info.suffix) < sizeof(names->pci_onboard))
strscpyl(names->pci_onboard, sizeof(names->pci_onboard),
vf_names.pci_onboard, vf_info.suffix, NULL);
if (vf_names.pci_slot[0])
if (strlen(vf_names.pci_slot) + strlen(vf_info.suffix) < sizeof(names->pci_slot))
strscpyl(names->pci_slot, sizeof(names->pci_slot),
vf_names.pci_slot, vf_info.suffix, NULL);
if (vf_names.pci_path[0])
if (strlen(vf_names.pci_path) + strlen(vf_info.suffix) < sizeof(names->pci_path))
strscpyl(names->pci_path, sizeof(names->pci_path),
vf_names.pci_path, vf_info.suffix, NULL);
udev_device_unref(vf_info.physfn_pcidev);
} else {
dev_pci_onboard(dev, names);
dev_pci_slot(dev, names);
}
return 0;
}
static int names_usb(struct udev_device *dev, struct netnames *names) {
struct udev_device *usbdev;
char name[256];
char *ports;
char *config;
char *interf;
size_t l;
char *s;
assert(dev);
assert(names);
usbdev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
if (!usbdev)
return -ENOENT;
/* get USB port number chain, configuration, interface */
strscpy(name, sizeof(name), udev_device_get_sysname(usbdev));
s = strchr(name, '-');
if (!s)
return -EINVAL;
ports = s+1;
s = strchr(ports, ':');
if (!s)
return -EINVAL;
s[0] = '\0';
config = s+1;
s = strchr(config, '.');
if (!s)
return -EINVAL;
s[0] = '\0';
interf = s+1;
/* prefix every port number in the chain with "u" */
s = ports;
while ((s = strchr(s, '.')))
s[0] = 'u';
s = names->usb_ports;
l = strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL);
/* append USB config number, suppress the common config == 1 */
if (!streq(config, "1"))
l = strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL);
/* append USB interface number, suppress the interface == 0 */
if (!streq(interf, "0"))
l = strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL);
if (l == 0)
return -ENAMETOOLONG;
names->type = NET_USB;
return 0;
}
static int names_bcma(struct udev_device *dev, struct netnames *names) {
struct udev_device *bcmadev;
unsigned int core;
assert(dev);
assert(names);
bcmadev = udev_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL);
if (!bcmadev)
return -ENOENT;
/* bus num:core num */
if (sscanf(udev_device_get_sysname(bcmadev), "bcma%*u:%u", &core) != 1)
return -EINVAL;
/* suppress the common core == 0 */
if (core > 0)
xsprintf(names->bcma_core, "b%u", core);
names->type = NET_BCMA;
return 0;
}
static int names_ccw(struct udev_device *dev, struct netnames *names) {
struct udev_device *cdev;
const char *bus_id, *subsys;
size_t bus_id_len;
size_t bus_id_start;
assert(dev);
assert(names);
/* Retrieve the associated CCW device */
cdev = udev_device_get_parent(dev);
/* skip virtio subsystem if present */
cdev = skip_virtio(cdev);
if (!cdev)
return -ENOENT;
/* Network devices are either single or grouped CCW devices */
subsys = udev_device_get_subsystem(cdev);
if (!STRPTR_IN_SET(subsys, "ccwgroup", "ccw"))
return -ENOENT;
/* Retrieve bus-ID of the CCW device. The bus-ID uniquely
* identifies the network device on the Linux on System z channel
* subsystem. Note that the bus-ID contains lowercase characters.
*/
bus_id = udev_device_get_sysname(cdev);
if (!bus_id)
return -ENOENT;
/* Check the length of the bus-ID. Rely on that the kernel provides
* a correct bus-ID; alternatively, improve this check and parse and
* verify each bus-ID part...
*/
bus_id_len = strlen(bus_id);
if (!IN_SET(bus_id_len, 8, 9))
return -EINVAL;
/* Strip leading zeros from the bus id for aesthetic purposes. This
* keeps the ccw names stable, yet much shorter in general case of
* bus_id 0.0.0600 -> 600. This is similar to e.g. how PCI domain is
* not prepended when it is zero. Preserve the last 0 for 0.0.0000.
*/
bus_id_start = strspn(bus_id, ".0");
bus_id += bus_id_start < bus_id_len ? bus_id_start : bus_id_len - 1;
/* Store the CCW bus-ID for use as network device name */
if (snprintf_ok(names->ccw_busid, sizeof(names->ccw_busid), "c%s", bus_id))
names->type = NET_CCW;
return 0;
}
static int names_mac(struct udev_device *dev, struct netnames *names) {
const char *s;
unsigned int i;
unsigned int a1, a2, a3, a4, a5, a6;
/* check for NET_ADDR_PERM, skip random MAC addresses */
s = udev_device_get_sysattr_value(dev, "addr_assign_type");
if (!s)
return EXIT_FAILURE;
i = strtoul(s, NULL, 0);
if (i != 0)
return 0;
s = udev_device_get_sysattr_value(dev, "address");
if (!s)
return -ENOENT;
if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
return -EINVAL;
/* skip empty MAC addresses */
if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
return -EINVAL;
names->mac[0] = a1;
names->mac[1] = a2;
names->mac[2] = a3;
names->mac[3] = a4;
names->mac[4] = a5;
names->mac[5] = a6;
names->mac_valid = true;
return 0;
}
/* IEEE Organizationally Unique Identifier vendor string */
static int ieee_oui(struct udev_device *dev, struct netnames *names, bool test) {
char str[32];
if (!names->mac_valid)
return -ENOENT;
/* skip commonly misused 00:00:00 (Xerox) prefix */
if (memcmp(names->mac, "\0\0\0", 3) == 0)
return -EINVAL;
xsprintf(str, "OUI:%02X%02X%02X%02X%02X%02X", names->mac[0],
names->mac[1], names->mac[2], names->mac[3], names->mac[4],
names->mac[5]);
udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test);
return 0;
}
static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
const char *s;
const char *p;
unsigned int i;
const char *devtype;
const char *prefix = "en";
struct netnames names = {};
int err;
/* handle only ARPHRD_ETHER and ARPHRD_SLIP devices */
s = udev_device_get_sysattr_value(dev, "type");
if (!s)
return EXIT_FAILURE;
i = strtoul(s, NULL, 0);
switch (i) {
case ARPHRD_ETHER:
prefix = "en";
break;
case ARPHRD_SLIP:
prefix = "sl";
break;
default:
return 0;
}
/* skip stacked devices, like VLANs, ... */
s = udev_device_get_sysattr_value(dev, "ifindex");
if (!s)
return EXIT_FAILURE;
p = udev_device_get_sysattr_value(dev, "iflink");
if (!p)
return EXIT_FAILURE;
if (!streq(s, p))
return 0;
devtype = udev_device_get_devtype(dev);
if (devtype) {
if (streq("wlan", devtype))
prefix = "wl";
else if (streq("wwan", devtype))
prefix = "ww";
}
err = names_mac(dev, &names);
if (err >= 0 && names.mac_valid) {
char str[IFNAMSIZ];
xsprintf(str, "%sx%02x%02x%02x%02x%02x%02x", prefix,
names.mac[0], names.mac[1], names.mac[2],
names.mac[3], names.mac[4], names.mac[5]);
udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
ieee_oui(dev, &names, test);
}
/* get path names for Linux on System z network devices */
err = names_ccw(dev, &names);
if (err >= 0 && names.type == NET_CCW) {
char str[IFNAMSIZ];
if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.ccw_busid))
udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
goto out;
}
/* get ibmveth/ibmvnic slot-based names. */
err = names_vio(dev, &names);
if (err >= 0 && names.type == NET_VIO) {
char str[IFNAMSIZ];
if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.vio_slot))
udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
goto out;
}
/* get ACPI path names for ARM64 platform devices */
err = names_platform(dev, &names, test);
if (err >= 0 && names.type == NET_PLATFORM) {
char str[IFNAMSIZ];
if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.platform_path))
udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
goto out;
}
/* get PCI based path names, we compose only PCI based paths */
err = names_pci(dev, &names);
if (err < 0)
goto out;
/* plain PCI device */
if (names.type == NET_PCI) {
char str[IFNAMSIZ];
if (names.pci_onboard[0] &&
snprintf_ok(str, sizeof str, "%s%s", prefix, names.pci_onboard))
udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);
if (names.pci_onboard_label &&
snprintf_ok(str, sizeof str, "%s%s", prefix, names.pci_onboard_label))
udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str);
if (names.pci_path[0] &&
snprintf_ok(str, sizeof str, "%s%s", prefix, names.pci_path))
udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
if (names.pci_slot[0] &&
snprintf_ok(str, sizeof str, "%s%s", prefix, names.pci_slot))
udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
goto out;
}
/* USB device */
err = names_usb(dev, &names);
if (err >= 0 && names.type == NET_USB) {
char str[IFNAMSIZ];
if (names.pci_path[0] &&
snprintf_ok(str, sizeof str, "%s%s%s", prefix, names.pci_path, names.usb_ports))
udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
if (names.pci_slot[0] &&
snprintf_ok(str, sizeof str, "%s%s%s", prefix, names.pci_slot, names.usb_ports))
udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
goto out;
}
/* Broadcom bus */
err = names_bcma(dev, &names);
if (err >= 0 && names.type == NET_BCMA) {
char str[IFNAMSIZ];
if (names.pci_path[0] &&
snprintf_ok(str, sizeof str, "%s%s%s", prefix, names.pci_path, names.bcma_core))
udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
if (names.pci_slot[0] &&
snprintf(str, sizeof str, "%s%s%s", prefix, names.pci_slot, names.bcma_core))
udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
goto out;
}
out:
return EXIT_SUCCESS;
}
const struct udev_builtin udev_builtin_net_id = {
.name = "net_id",
.cmd = builtin_net_id,
.help = "Network device properties",
};