897 lines
33 KiB
C
897 lines
33 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/*
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* Predictable network interface device names based on:
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* - firmware/bios-provided index numbers for on-board devices
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* - firmware-provided pci-express hotplug slot index number
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* - physical/geographical location of the hardware
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* - the interface's MAC address
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*
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* http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames
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*
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* Two character prefixes based on the type of interface:
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* en — Ethernet
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* ib — InfiniBand
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* sl — serial line IP (slip)
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* wl — wlan
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* ww — wwan
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*
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* Type of names:
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* b<number> — BCMA bus core number
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* c<bus_id> — bus id of a grouped CCW or CCW device,
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* with all leading zeros stripped [s390]
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* o<index>[n<phys_port_name>|d<dev_port>]
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* — on-board device index number
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* s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
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* — hotplug slot index number
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* x<MAC> — MAC address
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* [P<domain>]p<bus>s<slot>[f<function>][n<phys_port_name>|d<dev_port>]
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* — PCI geographical location
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* [P<domain>]p<bus>s<slot>[f<function>][u<port>][..][c<config>][i<interface>]
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* — USB port number chain
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* v<slot> - VIO slot number (IBM PowerVM)
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* a<vendor><model>i<instance> — Platform bus ACPI instance id
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*
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* All multi-function PCI devices will carry the [f<function>] number in the
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* device name, including the function 0 device.
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*
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* SR-IOV virtual devices are named based on the name of the parent interface,
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* with a suffix of "v<N>", where <N> is the virtual device number.
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*
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* When using PCI geography, The PCI domain is only prepended when it is not 0.
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*
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* For USB devices the full chain of port numbers of hubs is composed. If the
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* name gets longer than the maximum number of 15 characters, the name is not
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* exported.
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* The usual USB configuration == 1 and interface == 0 values are suppressed.
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*
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* PCI Ethernet card with firmware index "1":
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* ID_NET_NAME_ONBOARD=eno1
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* ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1
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*
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* PCI Ethernet card in hotplug slot with firmware index number:
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* /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1
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* ID_NET_NAME_MAC=enx000000000466
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* ID_NET_NAME_PATH=enp5s0
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* ID_NET_NAME_SLOT=ens1
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*
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* PCI Ethernet multi-function card with 2 ports:
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* /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/enp2s0f0
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* ID_NET_NAME_MAC=enx78e7d1ea46da
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* ID_NET_NAME_PATH=enp2s0f0
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* /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.1/net/enp2s0f1
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* ID_NET_NAME_MAC=enx78e7d1ea46dc
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* ID_NET_NAME_PATH=enp2s0f1
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*
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* PCI wlan card:
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* /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlp3s0
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* ID_NET_NAME_MAC=wlx0024d7e31130
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* ID_NET_NAME_PATH=wlp3s0
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*
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* PCI IB host adapter with 2 ports:
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* /sys/devices/pci0000:00/0000:00:03.0/0000:15:00.0/net/ibp21s0f0
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* ID_NET_NAME_PATH=ibp21s0f0
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* /sys/devices/pci0000:00/0000:00:03.0/0000:15:00.1/net/ibp21s0f1
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* ID_NET_NAME_PATH=ibp21s0f1
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*
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* USB built-in 3G modem:
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* /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.6/net/wwp0s29u1u4i6
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* ID_NET_NAME_MAC=wwx028037ec0200
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* ID_NET_NAME_PATH=wwp0s29u1u4i6
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*
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* USB Android phone:
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* /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/net/enp0s29u1u2
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* ID_NET_NAME_MAC=enxd626b3450fb5
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* ID_NET_NAME_PATH=enp0s29u1u2
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*
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* s390 grouped CCW interface:
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* /sys/devices/css0/0.0.0007/0.0.f5f0/group_device/net/encf5f0
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* ID_NET_NAME_MAC=enx026d3c00000a
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* ID_NET_NAME_PATH=encf5f0
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/pci_regs.h>
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#include "alloc-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "libudev-private.h"
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#include "parse-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "strxcpyx.h"
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#include "udev-builtin.h"
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#define ONBOARD_INDEX_MAX (16*1024-1)
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enum netname_type{
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NET_UNDEF,
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NET_PCI,
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NET_USB,
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NET_BCMA,
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NET_VIRTIO,
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NET_CCW,
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NET_VIO,
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NET_PLATFORM,
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};
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struct netnames {
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enum netname_type type;
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uint8_t mac[6];
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bool mac_valid;
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struct udev_device *pcidev;
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char pci_slot[IFNAMSIZ];
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char pci_path[IFNAMSIZ];
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char pci_onboard[IFNAMSIZ];
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const char *pci_onboard_label;
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char usb_ports[IFNAMSIZ];
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char bcma_core[IFNAMSIZ];
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char ccw_busid[IFNAMSIZ];
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char vio_slot[IFNAMSIZ];
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char platform_path[IFNAMSIZ];
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};
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struct virtfn_info {
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struct udev_device *physfn_pcidev;
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char suffix[IFNAMSIZ];
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};
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/* skip intermediate virtio devices */
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static struct udev_device *skip_virtio(struct udev_device *dev) {
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struct udev_device *parent = dev;
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/* there can only ever be one virtio bus per parent device, so we can
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safely ignore any virtio buses. see
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<http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html> */
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while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
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parent = udev_device_get_parent(parent);
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return parent;
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}
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static int get_virtfn_info(struct udev_device *dev, struct netnames *names, struct virtfn_info *vf_info) {
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const char *physfn_link_file;
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_cleanup_free_ char *physfn_pci_syspath = NULL;
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_cleanup_free_ char *virtfn_pci_syspath = NULL;
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struct dirent *dent;
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_cleanup_closedir_ DIR *dir = NULL;
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struct virtfn_info vf_info_local = {};
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int r;
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/* Check if this is a virtual function. */
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physfn_link_file = strjoina(udev_device_get_syspath(names->pcidev), "/physfn");
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r = chase_symlinks(physfn_link_file, NULL, 0, &physfn_pci_syspath);
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if (r < 0)
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return r;
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/* Get physical function's pci device. */
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vf_info_local.physfn_pcidev = udev_device_new_from_syspath(NULL, physfn_pci_syspath);
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if (!vf_info_local.physfn_pcidev)
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return -ENOENT;
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/* Find the virtual function number by finding the right virtfn link. */
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dir = opendir(physfn_pci_syspath);
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if (!dir) {
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r = -errno;
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goto out_unref;
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}
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FOREACH_DIRENT_ALL(dent, dir, break) {
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_cleanup_free_ char *virtfn_link_file = NULL;
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if (!startswith(dent->d_name, "virtfn"))
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continue;
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virtfn_link_file = strjoin(physfn_pci_syspath, "/", dent->d_name);
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if (!virtfn_link_file) {
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r = -ENOMEM;
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goto out_unref;
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}
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if (chase_symlinks(virtfn_link_file, NULL, 0, &virtfn_pci_syspath) < 0)
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continue;
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if (streq(udev_device_get_syspath(names->pcidev), virtfn_pci_syspath)) {
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if (!snprintf_ok(vf_info_local.suffix, sizeof(vf_info_local.suffix), "v%s", &dent->d_name[6])) {
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r = -ENOENT;
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goto out_unref;
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}
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break;
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}
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}
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if (isempty(vf_info_local.suffix)) {
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r = -ENOENT;
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goto out_unref;
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}
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*vf_info = vf_info_local;
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return 0;
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out_unref:
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udev_device_unref(vf_info_local.physfn_pcidev);
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return r;
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}
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/* retrieve on-board index number and label from firmware */
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static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
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unsigned long idx, dev_port = 0;
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const char *attr, *port_name;
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size_t l;
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char *s;
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int r;
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/* ACPI _DSM — device specific method for naming a PCI or PCI Express device */
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attr = udev_device_get_sysattr_value(names->pcidev, "acpi_index");
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/* SMBIOS type 41 — Onboard Devices Extended Information */
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if (!attr)
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attr = udev_device_get_sysattr_value(names->pcidev, "index");
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if (!attr)
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return -ENOENT;
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r = safe_atolu(attr, &idx);
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if (r < 0)
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return r;
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/* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
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* example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
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* cut-off, which is somewhere beyond the realistic number of physical network interface a system might
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* have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
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if (idx > ONBOARD_INDEX_MAX)
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return -ENOENT;
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/* kernel provided port index for multiple ports on a single PCI function */
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attr = udev_device_get_sysattr_value(dev, "dev_port");
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if (attr)
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dev_port = strtoul(attr, NULL, 10);
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/* kernel provided front panel port name for multiple port PCI device */
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port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
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s = names->pci_onboard;
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l = sizeof(names->pci_onboard);
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l = strpcpyf(&s, l, "o%lu", idx);
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if (port_name)
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l = strpcpyf(&s, l, "n%s", port_name);
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else if (dev_port > 0)
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l = strpcpyf(&s, l, "d%lu", dev_port);
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if (l == 0)
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names->pci_onboard[0] = '\0';
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names->pci_onboard_label = udev_device_get_sysattr_value(names->pcidev, "label");
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return 0;
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}
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/* read the 256 bytes PCI configuration space to check the multi-function bit */
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static bool is_pci_multifunction(struct udev_device *dev) {
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_cleanup_close_ int fd = -1;
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const char *filename;
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uint8_t config[64];
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filename = strjoina(udev_device_get_syspath(dev), "/config");
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fd = open(filename, O_RDONLY | O_CLOEXEC);
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if (fd < 0)
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return false;
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if (read(fd, &config, sizeof(config)) != sizeof(config))
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return false;
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/* bit 0-6 header type, bit 7 multi/single function device */
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if ((config[PCI_HEADER_TYPE] & 0x80) != 0)
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return true;
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return false;
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}
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static bool is_pci_ari_enabled(struct udev_device *dev) {
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return streq_ptr(udev_device_get_sysattr_value(dev, "ari_enabled"), "1");
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}
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static int dev_pci_slot(struct udev_device *dev, struct netnames *names) {
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unsigned long dev_port = 0;
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unsigned domain, bus, slot, func, hotplug_slot = 0;
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size_t l;
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char *s;
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const char *attr, *port_name;
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_cleanup_(udev_device_unrefp) struct udev_device *pci = NULL;
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struct udev_device *hotplug_slot_dev;
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char slots[PATH_MAX];
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *dent;
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if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
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return -ENOENT;
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if (is_pci_ari_enabled(names->pcidev))
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/* ARI devices support up to 256 functions on a single device ("slot"), and interpret the
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* traditional 5-bit slot and 3-bit function number as a single 8-bit function number,
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* where the slot makes up the upper 5 bits. */
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func += slot * 8;
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/* kernel provided port index for multiple ports on a single PCI function */
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attr = udev_device_get_sysattr_value(dev, "dev_port");
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if (attr) {
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dev_port = strtoul(attr, NULL, 10);
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/* With older kernels IP-over-InfiniBand network interfaces sometimes erroneously
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* provide the port number in the 'dev_id' sysfs attribute instead of 'dev_port',
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* which thus stays initialized as 0. */
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if (dev_port == 0) {
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attr = udev_device_get_sysattr_value(dev, "type");
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if (attr) {
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unsigned long type = strtoul(attr, NULL, 10);
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if (type == ARPHRD_INFINIBAND) {
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attr = udev_device_get_sysattr_value(dev, "dev_id");
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if (attr)
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dev_port = strtoul(attr, NULL, 16);
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}
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}
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}
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}
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/* kernel provided front panel port name for multiple port PCI device */
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port_name = udev_device_get_sysattr_value(dev, "phys_port_name");
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/* compose a name based on the raw kernel's PCI bus, slot numbers */
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s = names->pci_path;
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l = sizeof(names->pci_path);
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if (domain > 0)
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l = strpcpyf(&s, l, "P%u", domain);
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l = strpcpyf(&s, l, "p%us%u", bus, slot);
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if (func > 0 || is_pci_multifunction(names->pcidev))
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l = strpcpyf(&s, l, "f%u", func);
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if (port_name)
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l = strpcpyf(&s, l, "n%s", port_name);
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else if (dev_port > 0)
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l = strpcpyf(&s, l, "d%lu", dev_port);
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if (l == 0)
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names->pci_path[0] = '\0';
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/* ACPI _SUN — slot user number */
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pci = udev_device_new_from_subsystem_sysname(NULL, "subsystem", "pci");
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if (!pci)
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return -ENOENT;
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if (!snprintf_ok(slots, sizeof slots, "%s/slots", udev_device_get_syspath(pci)))
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return -ENAMETOOLONG;
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dir = opendir(slots);
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if (!dir)
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return -errno;
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hotplug_slot_dev = names->pcidev;
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while (hotplug_slot_dev) {
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FOREACH_DIRENT_ALL(dent, dir, break) {
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unsigned i;
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int r;
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char str[PATH_MAX];
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_cleanup_free_ char *address = NULL;
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if (dent->d_name[0] == '.')
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continue;
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r = safe_atou_full(dent->d_name, 10, &i);
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if (i < 1 || r < 0)
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continue;
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if (snprintf_ok(str, sizeof str, "%s/%s/address", slots, dent->d_name) &&
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read_one_line_file(str, &address) >= 0)
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/* match slot address with device by stripping the function */
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if (startswith(udev_device_get_sysname(hotplug_slot_dev), address))
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hotplug_slot = i;
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if (hotplug_slot > 0)
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break;
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}
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if (hotplug_slot > 0)
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break;
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rewinddir(dir);
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hotplug_slot_dev = udev_device_get_parent_with_subsystem_devtype(hotplug_slot_dev, "pci", NULL);
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}
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if (hotplug_slot > 0) {
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s = names->pci_slot;
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l = sizeof(names->pci_slot);
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if (domain > 0)
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l = strpcpyf(&s, l, "P%d", domain);
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l = strpcpyf(&s, l, "s%d", hotplug_slot);
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if (func > 0 || is_pci_multifunction(names->pcidev))
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l = strpcpyf(&s, l, "f%d", func);
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if (port_name)
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l = strpcpyf(&s, l, "n%s", port_name);
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else if (dev_port > 0)
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l = strpcpyf(&s, l, "d%lu", dev_port);
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if (l == 0)
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names->pci_slot[0] = '\0';
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}
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return 0;
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}
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static int names_vio(struct udev_device *dev, struct netnames *names) {
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struct udev_device *parent;
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unsigned busid, slotid, ethid;
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const char *syspath;
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/* check if our direct parent is a VIO device with no other bus in-between */
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parent = udev_device_get_parent(dev);
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if (!parent)
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return -ENOENT;
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if (!streq_ptr("vio", udev_device_get_subsystem(parent)))
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return -ENOENT;
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/* The devices' $DEVPATH number is tied to (virtual) hardware (slot id
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* selected in the HMC), thus this provides a reliable naming (e.g.
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* "/devices/vio/30000002/net/eth1"); we ignore the bus number, as
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* there should only ever be one bus, and then remove leading zeros. */
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syspath = udev_device_get_syspath(dev);
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if (sscanf(syspath, "/sys/devices/vio/%4x%4x/net/eth%u", &busid, &slotid, ðid) != 3)
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return -EINVAL;
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xsprintf(names->vio_slot, "v%u", slotid);
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names->type = NET_VIO;
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return 0;
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}
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#define _PLATFORM_TEST "/sys/devices/platform/vvvvPPPP"
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#define _PLATFORM_PATTERN4 "/sys/devices/platform/%4s%4x:%2x/net/eth%u"
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#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, ðid) != 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 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 long i;
|
|
unsigned a1, a2, a3, a4, a5, a6;
|
|
|
|
/* Some kinds of devices tend to have hardware addresses
|
|
* that are impossible to use in an iface name.
|
|
*/
|
|
s = udev_device_get_sysattr_value(dev, "type");
|
|
if (!s)
|
|
return EXIT_FAILURE;
|
|
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 */
|
|
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 long i;
|
|
const char *devtype;
|
|
const char *prefix = "en";
|
|
struct netnames names = {};
|
|
int err;
|
|
|
|
/* handle only ARPHRD_ETHER, ARPHRD_SLIP
|
|
* and ARPHRD_INFINIBAND 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_INFINIBAND:
|
|
prefix = "ib";
|
|
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",
|
|
};
|