+++ /dev/null
-/***
- This file is part of systemd.
-
- Copyright 2012 Kay Sievers <kay@vrfy.org>
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-/*
- * 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
- * sl -- serial line IP (slip)
- * wl -- wlan
- * ww -- wwan
- *
- * Type of names:
- * b<number> -- BCMA bus core number
- * ccw<name> -- CCW bus group name
- * o<index>[d<dev_port>] -- on-board device index number
- * s<slot>[f<function>][d<dev_port>] -- hotplug slot index number
- * x<MAC> -- MAC address
- * [P<domain>]p<bus>s<slot>[f<function>][d<dev_port>]
- * -- PCI geographical location
- * [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
- * -- USB port number chain
- *
- * All multi-function PCI devices will carry the [f<function>] number in the
- * device name, including the function 0 device.
- *
- * 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
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <net/if.h>
-#include <net/if_arp.h>
-#include <linux/pci_regs.h>
-
-#include "udev.h"
-#include "fileio.h"
-
-enum netname_type{
- NET_UNDEF,
- NET_PCI,
- NET_USB,
- NET_BCMA,
- NET_VIRTIO,
- NET_CCWGROUP,
-};
-
-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_group[IFNAMSIZ];
-};
-
-/* 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;
- int idx;
-
- /* ACPI _DSM -- device specific method for naming a PCI or PCI Express device */
- attr = udev_device_get_sysattr_value(names->pcidev, "acpi_index");
- /* SMBIOS type 41 -- 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;
-
- /* 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);
-
- s = names->pci_onboard;
- l = sizeof(names->pci_onboard);
- l = strpcpyf(&s, l, "o%d", idx);
- 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_fclose_ FILE *f = NULL;
- const char *filename;
- uint8_t config[64];
-
- filename = strjoina(udev_device_get_syspath(dev), "/config");
- f = fopen(filename, "re");
- if (!f)
- return false;
- if (fread(&config, sizeof(config), 1, f) != 1)
- 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 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;
- size_t l;
- char *s;
- const char *attr;
- struct udev_device *pci = NULL;
- char slots[256], str[256];
- _cleanup_closedir_ DIR *dir = NULL;
- struct dirent *dent;
- int hotplug_slot = 0, err = 0;
-
- if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
- 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);
-
- /* 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 (dev_port > 0)
- l = strpcpyf(&s, l, "d%u", dev_port);
- if (l == 0)
- names->pci_path[0] = '\0';
-
- /* ACPI _SUN -- slot user number */
- pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
- if (!pci) {
- err = -ENOENT;
- goto out;
- }
- snprintf(slots, sizeof(slots), "%s/slots", udev_device_get_syspath(pci));
- dir = opendir(slots);
- if (!dir) {
- err = -errno;
- goto out;
- }
-
- for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- int i;
- char *rest;
- char *address;
-
- if (dent->d_name[0] == '.')
- continue;
- i = strtol(dent->d_name, &rest, 10);
- if (rest[0] != '\0')
- continue;
- if (i < 1)
- continue;
- snprintf(str, sizeof(str), "%s/%s/address", slots, dent->d_name);
- if (read_one_line_file(str, &address) >= 0) {
- /* match slot address with device by stripping the function */
- if (strneq(address, udev_device_get_sysname(names->pcidev), strlen(address)))
- hotplug_slot = i;
- free(address);
- }
-
- if (hotplug_slot > 0)
- break;
- }
-
- 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 (dev_port > 0)
- l = strpcpyf(&s, l, "d%d", dev_port);
- if (l == 0)
- names->pci_slot[0] = '\0';
- }
-out:
- udev_device_unref(pci);
- return err;
-}
-
-static int names_pci(struct udev_device *dev, struct netnames *names) {
- struct udev_device *parent;
-
- parent = udev_device_get_parent(dev);
- 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;
- }
- 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;
-
- 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;
-
- 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)
- snprintf(names->bcma_core, sizeof(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;
- size_t bus_id_len;
- int rc;
-
- /* Retrieve the associated CCW device */
- cdev = udev_device_get_parent(dev);
- if (!cdev)
- return -ENOENT;
-
- /* Network devices are always grouped CCW devices */
- if (!streq_ptr("ccwgroup", udev_device_get_subsystem(cdev)))
- return -ENOENT;
-
- /* Retrieve bus-ID of the grouped 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 (!bus_id_len || bus_id_len < 8 || bus_id_len > 9)
- return -EINVAL;
-
- /* Store the CCW bus-ID for use as network device name */
- rc = snprintf(names->ccw_group, sizeof(names->ccw_group), "ccw%s", bus_id);
- if (rc >= 0 && rc < (int)sizeof(names->ccw_group))
- names->type = NET_CCWGROUP;
- 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;
- snprintf(str, sizeof(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];
-
- snprintf(str, sizeof(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_CCWGROUP) {
- char str[IFNAMSIZ];
-
- if (snprintf(str, sizeof(str), "%s%s", prefix, names.ccw_group) < (int)sizeof(str))
- 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])
- if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard) < (int)sizeof(str))
- udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);
-
- if (names.pci_onboard_label)
- if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_onboard_label) < (int)sizeof(str))
- udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str);
-
- if (names.pci_path[0])
- if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_path) < (int)sizeof(str))
- udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
-
- if (names.pci_slot[0])
- if (snprintf(str, sizeof(str), "%s%s", prefix, names.pci_slot) < (int)sizeof(str))
- 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])
- if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.usb_ports) < (int)sizeof(str))
- udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
-
- if (names.pci_slot[0])
- if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.usb_ports) < (int)sizeof(str))
- 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])
- if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.bcma_core) < (int)sizeof(str))
- udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
-
- if (names.pci_slot[0])
- if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.bcma_core) < (int)sizeof(str))
- 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",
-};
~ianmdlvl / elogind.git / blobdiff