Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 961 insertions, 0 deletions

diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
new file mode 100644
index 0000000..03b281a
--- /dev/null
+++ b/src/udev/udev-builtin-net_id.c
@@ -0,0 +1,961 @@
+/* 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 — Ethernet
+ *   ib — InfiniBand
+ *   sl — serial line IP (slip)
+ *   wl — wlan
+ *   ww — wwan
+ *
+ * Type of names:
+ *   b<number>                             — BCMA bus core number
+ *   c<bus_id>                             — bus id of a grouped CCW or CCW device,
+ *                                           with all leading zeros stripped [s390]
+ *   o<index>[n<phys_port_name>|d<dev_port>]
+ *                                         — on-board device index number
+ *   s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
+ *                                         — hotplug slot index number
+ *   x<MAC>                                — MAC address
+ *   [P<domain>]p<bus>s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
+ *                                         — PCI geographical location
+ *   [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
+ *                                         — USB port number chain
+ *   v<slot>                               - VIO slot number (IBM PowerVM)
+ *   a<vendor><model>i<instance>           — 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
+ *
+ * PCI IB host adapter with 2 ports:
+ *   /sys/devices/pci0000:00/0000:00:03.0/0000:15:00.0/net/ibp21s0f0
+ *   ID_NET_NAME_PATH=ibp21s0f0
+ *   /sys/devices/pci0000:00/0000:00:03.0/0000:15:00.1/net/ibp21s0f1
+ *   ID_NET_NAME_PATH=ibp21s0f1
+ *
+ * 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 "alloc-util.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "naming-scheme.h"
+#include "parse-util.h"
+#include "proc-cmdline.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "strxcpyx.h"
+#include "udev-builtin.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;
+
+        sd_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 {
+        sd_device *physfn_pcidev;
+        char suffix[IFNAMSIZ];
+};
+
+/* skip intermediate virtio devices */
+static sd_device *skip_virtio(sd_device *dev) {
+        sd_device *parent;
+
+        /* 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 */
+        for (parent = dev; parent; ) {
+                const char *subsystem;
+
+                if (sd_device_get_subsystem(parent, &subsystem) < 0)
+                        break;
+
+                if (!streq(subsystem, "virtio"))
+                        break;
+
+                if (sd_device_get_parent(parent, &parent) < 0)
+                        return NULL;
+        }
+
+        return parent;
+}
+
+static int get_virtfn_info(sd_device *dev, struct netnames *names, struct virtfn_info *ret) {
+        _cleanup_(sd_device_unrefp) sd_device *physfn_pcidev = NULL;
+        const char *physfn_link_file, *syspath;
+        _cleanup_free_ char *physfn_pci_syspath = NULL;
+        _cleanup_free_ char *virtfn_pci_syspath = NULL;
+        struct dirent *dent;
+        _cleanup_closedir_ DIR *dir = NULL;
+        char suffix[IFNAMSIZ];
+        int r;
+
+        assert(dev);
+        assert(names);
+        assert(ret);
+
+        r = sd_device_get_syspath(names->pcidev, &syspath);
+        if (r < 0)
+                return r;
+
+        /* Check if this is a virtual function. */
+        physfn_link_file = strjoina(syspath, "/physfn");
+        r = chase_symlinks(physfn_link_file, NULL, 0, &physfn_pci_syspath);
+        if (r < 0)
+                return r;
+
+        /* Get physical function's pci device. */
+        r = sd_device_new_from_syspath(&physfn_pcidev, physfn_pci_syspath);
+        if (r < 0)
+                return r;
+
+        /* Find the virtual function number by finding the right virtfn link. */
+        dir = opendir(physfn_pci_syspath);
+        if (!dir)
+                return -errno;
+
+        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)
+                        return -ENOMEM;
+
+                if (chase_symlinks(virtfn_link_file, NULL, 0, &virtfn_pci_syspath) < 0)
+                        continue;
+
+                if (streq(syspath, virtfn_pci_syspath)) {
+                        if (!snprintf_ok(suffix, sizeof(suffix), "v%s", &dent->d_name[6]))
+                                return -ENOENT;
+
+                        break;
+                }
+        }
+        if (isempty(suffix))
+                return -ENOENT;
+
+        ret->physfn_pcidev = TAKE_PTR(physfn_pcidev);
+        strncpy(ret->suffix, suffix, sizeof(ret->suffix));
+
+        return 0;
+}
+
+/* retrieve on-board index number and label from firmware */
+static int dev_pci_onboard(sd_device *dev, struct netnames *names) {
+        unsigned long idx, dev_port = 0;
+        const char *attr, *port_name = NULL;
+        size_t l;
+        char *s;
+        int r;
+
+        /* ACPI _DSM  — device specific method for naming a PCI or PCI Express device */
+        if (sd_device_get_sysattr_value(names->pcidev, "acpi_index", &attr) < 0) {
+                /* SMBIOS type 41 — Onboard Devices Extended Information */
+                r = sd_device_get_sysattr_value(names->pcidev, "index", &attr);
+                if (r < 0)
+                        return r;
+        }
+
+        r = safe_atolu(attr, &idx);
+        if (r < 0)
+                return r;
+        if (idx == 0 && !naming_scheme_has(NAMING_ZERO_ACPI_INDEX))
+                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 */
+        if (sd_device_get_sysattr_value(dev, "dev_port", &attr) >= 0)
+                dev_port = strtoul(attr, NULL, 10);
+
+        /* kernel provided front panel port name for multiple port PCI device */
+        (void) sd_device_get_sysattr_value(dev, "phys_port_name", &port_name);
+
+        s = names->pci_onboard;
+        l = sizeof(names->pci_onboard);
+        l = strpcpyf(&s, l, "o%lu", idx);
+        if (port_name)
+                l = strpcpyf(&s, l, "n%s", port_name);
+        else if (dev_port > 0)
+                l = strpcpyf(&s, l, "d%lu", dev_port);
+        if (l == 0)
+                names->pci_onboard[0] = '\0';
+
+        if (sd_device_get_sysattr_value(names->pcidev, "label", &names->pci_onboard_label) < 0)
+                names->pci_onboard_label = NULL;
+
+        return 0;
+}
+
+/* read the 256 bytes PCI configuration space to check the multi-function bit */
+static bool is_pci_multifunction(sd_device *dev) {
+        _cleanup_close_ int fd = -1;
+        const char *filename, *syspath;
+        uint8_t config[64];
+
+        if (sd_device_get_syspath(dev, &syspath) < 0)
+                return false;
+
+        filename = strjoina(syspath, "/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 */
+        return config[PCI_HEADER_TYPE] & 0x80;
+}
+
+static bool is_pci_ari_enabled(sd_device *dev) {
+        const char *a;
+
+        if (sd_device_get_sysattr_value(dev, "ari_enabled", &a) < 0)
+                return false;
+
+        return streq(a, "1");
+}
+
+static int dev_pci_slot(sd_device *dev, struct netnames *names) {
+        unsigned long dev_port = 0;
+        unsigned domain, bus, slot, func, hotplug_slot = 0;
+        size_t l;
+        char *s;
+        const char *sysname, *attr, *port_name = NULL, *syspath;
+        _cleanup_(sd_device_unrefp) sd_device *pci = NULL;
+        sd_device *hotplug_slot_dev;
+        char slots[PATH_MAX];
+        _cleanup_closedir_ DIR *dir = NULL;
+        struct dirent *dent;
+        int r;
+
+        r = sd_device_get_sysname(names->pcidev, &sysname);
+        if (r < 0)
+                return r;
+
+        if (sscanf(sysname, "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
+                return -ENOENT;
+
+        if (naming_scheme_has(NAMING_NPAR_ARI) &&
+            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 */
+        if (sd_device_get_sysattr_value(dev, "dev_port", &attr) >= 0) {
+                dev_port = strtoul(attr, NULL, 10);
+                /* With older kernels IP-over-InfiniBand network interfaces sometimes erroneously
+                 * provide the port number in the 'dev_id' sysfs attribute instead of 'dev_port',
+                 * which thus stays initialized as 0. */
+                if (dev_port == 0 &&
+                    sd_device_get_sysattr_value(dev, "type", &attr) >= 0) {
+                        unsigned long type;
+
+                        type = strtoul(attr, NULL, 10);
+                        if (type == ARPHRD_INFINIBAND &&
+                            sd_device_get_sysattr_value(dev, "dev_id", &attr) >= 0)
+                                dev_port = strtoul(attr, NULL, 16);
+                }
+        }
+
+        /* kernel provided front panel port name for multi-port PCI device */
+        (void) sd_device_get_sysattr_value(dev, "phys_port_name", &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%lu", dev_port);
+        if (l == 0)
+                names->pci_path[0] = '\0';
+
+        /* ACPI _SUN — slot user number */
+        r = sd_device_new_from_subsystem_sysname(&pci, "subsystem", "pci");
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_syspath(pci, &syspath);
+        if (r < 0)
+                return r;
+        if (!snprintf_ok(slots, sizeof slots, "%s/slots", syspath))
+                return -ENAMETOOLONG;
+
+        dir = opendir(slots);
+        if (!dir)
+                return -errno;
+
+        hotplug_slot_dev = names->pcidev;
+        while (hotplug_slot_dev) {
+                if (sd_device_get_sysname(hotplug_slot_dev, &sysname) < 0)
+                        continue;
+
+                FOREACH_DIRENT_ALL(dent, dir, break) {
+                        unsigned i;
+                        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 (r < 0 || i <= 0)
+                                continue;
+
+                        /* match slot address with device by stripping the function */
+                        if (snprintf_ok(str, sizeof str, "%s/%s/address", slots, dent->d_name) &&
+                            read_one_line_file(str, &address) >= 0 &&
+                            startswith(sysname, address)) {
+                                hotplug_slot = i;
+                                break;
+                        }
+                }
+                if (hotplug_slot > 0)
+                        break;
+                if (sd_device_get_parent_with_subsystem_devtype(hotplug_slot_dev, "pci", NULL, &hotplug_slot_dev) < 0)
+                        break;
+                rewinddir(dir);
+        }
+
+        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%lu", dev_port);
+                if (l == 0)
+                        names->pci_slot[0] = '\0';
+        }
+
+        return 0;
+}
+
+static int names_vio(sd_device *dev, struct netnames *names) {
+        sd_device *parent;
+        unsigned busid, slotid, ethid;
+        const char *syspath, *subsystem;
+        int r;
+
+        /* check if our direct parent is a VIO device with no other bus in-between */
+        r = sd_device_get_parent(dev, &parent);
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_subsystem(parent, &subsystem);
+        if (r < 0)
+                return r;
+        if (!streq("vio", subsystem))
+                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. */
+        r = sd_device_get_syspath(dev, &syspath);
+        if (r < 0)
+                return r;
+
+        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(sd_device *dev, struct netnames *names, bool test) {
+        sd_device *parent;
+        char vendor[5];
+        unsigned model, instance, ethid;
+        const char *syspath, *pattern, *validchars, *subsystem;
+        int r;
+
+        /* check if our direct parent is a platform device with no other bus in-between */
+        r = sd_device_get_parent(dev, &parent);
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_subsystem(parent, &subsystem);
+        if (r < 0)
+                return r;
+
+        if (!streq("platform", subsystem))
+                 return -ENOENT;
+
+        r = sd_device_get_syspath(dev, &syspath);
+        if (r < 0)
+                return r;
+
+        /* 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(sd_device *dev, struct netnames *names) {
+        sd_device *parent;
+        struct netnames vf_names = {};
+        struct virtfn_info vf_info = {};
+        const char *subsystem;
+        int r;
+
+        assert(dev);
+        assert(names);
+
+        r = sd_device_get_parent(dev, &parent);
+        if (r < 0)
+                return r;
+        /* 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 (sd_device_get_subsystem(parent, &subsystem) >= 0 &&
+            streq("pci", subsystem)) {
+                names->type = NET_PCI;
+                names->pcidev = parent;
+        } else {
+                r = sd_device_get_parent_with_subsystem_devtype(dev, "pci", NULL, &names->pcidev);
+                if (r < 0)
+                        return r;
+        }
+
+        if (naming_scheme_has(NAMING_SR_IOV_V) &&
+            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);
+                sd_device_unref(vf_info.physfn_pcidev);
+        } else {
+                dev_pci_onboard(dev, names);
+                dev_pci_slot(dev, names);
+        }
+
+        return 0;
+}
+
+static int names_usb(sd_device *dev, struct netnames *names) {
+        sd_device *usbdev;
+        char name[256], *ports, *config, *interf, *s;
+        const char *sysname;
+        size_t l;
+        int r;
+
+        assert(dev);
+        assert(names);
+
+        r = sd_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface", &usbdev);
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_sysname(usbdev, &sysname);
+        if (r < 0)
+                return r;
+
+        /* get USB port number chain, configuration, interface */
+        strscpy(name, sizeof(name), sysname);
+        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(sd_device *dev, struct netnames *names) {
+        sd_device *bcmadev;
+        unsigned core;
+        const char *sysname;
+        int r;
+
+        assert(dev);
+        assert(names);
+
+        r = sd_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL, &bcmadev);
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_sysname(bcmadev, &sysname);
+        if (r < 0)
+                return r;
+
+        /* bus num:core num */
+        if (sscanf(sysname, "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(sd_device *dev, struct netnames *names) {
+        sd_device *cdev;
+        const char *bus_id, *subsys;
+        size_t bus_id_len;
+        size_t bus_id_start;
+        int r;
+
+        assert(dev);
+        assert(names);
+
+        /* Retrieve the associated CCW device */
+        r = sd_device_get_parent(dev, &cdev);
+        if (r < 0)
+                return r;
+
+        /* skip virtio subsystem if present */
+        cdev = skip_virtio(cdev);
+        if (!cdev)
+                return -ENOENT;
+
+        r = sd_device_get_subsystem(cdev, &subsys);
+        if (r < 0)
+                return r;
+
+        /* Network devices are either single or grouped CCW devices */
+        if (!STR_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.
+         */
+        r = sd_device_get_sysname(cdev, &bus_id);
+        if (r < 0)
+                return r;
+
+        /* 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(sd_device *dev, struct netnames *names) {
+        const char *s;
+        unsigned long i;
+        unsigned a1, a2, a3, a4, a5, a6;
+        int r;
+
+        /* Some kinds of devices tend to have hardware addresses
+         * that are impossible to use in an iface name.
+         */
+        r = sd_device_get_sysattr_value(dev, "type", &s);
+        if (r < 0)
+                return r;
+
+        i = strtoul(s, NULL, 0);
+        switch (i) {
+        /* The persistent part of a hardware address of an InfiniBand NIC
+         * is 8 bytes long. We cannot fit this much in an iface name.
+         */
+        case ARPHRD_INFINIBAND:
+                return -EINVAL;
+        default:
+                break;
+        }
+
+        /* check for NET_ADDR_PERM, skip random MAC addresses */
+        r = sd_device_get_sysattr_value(dev, "addr_assign_type", &s);
+        if (r < 0)
+                return r;
+        i = strtoul(s, NULL, 0);
+        if (i != 0)
+                return 0;
+
+        r = sd_device_get_sysattr_value(dev, "address", &s);
+        if (r < 0)
+                return r;
+        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(sd_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(sd_device *dev, int argc, char *argv[], bool test) {
+        const char *s, *p, *devtype, *prefix = "en";
+        struct netnames names = {};
+        unsigned long i;
+        int r;
+
+        /* handle only ARPHRD_ETHER, ARPHRD_SLIP and ARPHRD_INFINIBAND devices */
+        r = sd_device_get_sysattr_value(dev, "type", &s);
+        if (r < 0)
+                return r;
+
+        i = strtoul(s, NULL, 0);
+        switch (i) {
+        case ARPHRD_ETHER:
+                prefix = "en";
+                break;
+        case ARPHRD_INFINIBAND:
+                if (naming_scheme_has(NAMING_INFINIBAND))
+                        prefix = "ib";
+                else
+                        return 0;
+                break;
+        case ARPHRD_SLIP:
+                prefix = "sl";
+                break;
+        default:
+                return 0;
+        }
+
+        /* skip stacked devices, like VLANs, ... */
+        r = sd_device_get_sysattr_value(dev, "ifindex", &s);
+        if (r < 0)
+                return r;
+        r = sd_device_get_sysattr_value(dev, "iflink", &p);
+        if (r < 0)
+                return r;
+        if (!streq(s, p))
+                return 0;
+
+        if (sd_device_get_devtype(dev, &devtype) >= 0) {
+                if (streq("wlan", devtype))
+                        prefix = "wl";
+                else if (streq("wwan", devtype))
+                        prefix = "ww";
+        }
+
+        udev_builtin_add_property(dev, test, "ID_NET_NAMING_SCHEME", naming_scheme()->name);
+
+        r = names_mac(dev, &names);
+        if (r >= 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 */
+        if (names_ccw(dev, &names) >= 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);
+                return 0;
+        }
+
+        /* get ibmveth/ibmvnic slot-based names. */
+        if (names_vio(dev, &names) >= 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);
+                return 0;
+        }
+
+        /* get ACPI path names for ARM64 platform devices */
+        if (names_platform(dev, &names, test) >= 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);
+                return 0;
+        }
+
+        /* get PCI based path names, we compose only PCI based paths */
+        if (names_pci(dev, &names) < 0)
+                return 0;
+
+        /* 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);
+                return 0;
+        }
+
+        /* USB device */
+        if (names_usb(dev, &names) >= 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);
+                return 0;
+        }
+
+        /* Broadcom bus */
+        if (names_bcma(dev, &names) >= 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);
+                return 0;
+        }
+
+        return 0;
+}
+
+const struct udev_builtin udev_builtin_net_id = {
+        .name = "net_id",
+        .cmd = builtin_net_id,
+        .help = "Network device properties",
+};