udev-builtin-net_id.c revision d23965a64eb5c2c97b839dc2e3e79fc1613994f1
/***
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/>.
***/
/*
* eno<index> -- ethernet on-board
* ID_NET_NAME_FIRMWARE=eno1
*
* enp<pci bus number>s<slot>f<function> -- physical location/path
* ID_NET_NAME_PATH=enp19s0f0
*
* enm<MAC address> -- MAC address
* ID_NET_NAME_MAC=enxf0def180d479
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "udev.h"
static int dev_pci(struct udev_device *dev, const char *prefix, bool test) {
struct udev_device *d;
unsigned int bus;
unsigned int slot;
unsigned int func;
const char *index;
int err;
/* skip other buses than direct PCI parents */
d = udev_device_get_parent(dev);
if (!d || !streq("pci", udev_device_get_subsystem(d)))
return -ENOENT;
/* find SMBIOS type 41 entries for on-board devices */
index = udev_device_get_sysattr_value(d, "index");
if (index) {
unsigned int idx;
idx = strtoul(index, NULL, 0);
if (idx > 0) {
const char *label;
char s[16];
snprintf(s, sizeof(s), "%so%d", prefix, idx);
udev_builtin_add_property(dev, test, "ID_NET_NAME_FIRMWARE", s);
label = udev_device_get_sysattr_value(d, "label");
if (label)
udev_builtin_add_property(dev, test, "ID_NET_LABEL_FIRMWARE", label);
}
}
/* compose a name based on the PCI bus location */
if (sscanf(udev_device_get_sysname(d), "0000:%x:%x.%d", &bus, &slot, &func) == 3) {
char str[16];
snprintf(str, sizeof(str), "%sp%ds%df%d", prefix, bus, slot, func);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
if (err < 0)
return err;
}
return 0;
}
static int dev_mac(struct udev_device *dev, const char *prefix, bool test) {
const char *s;
unsigned int i;
unsigned int a1, a2, a3, a4, a5, a6;
char str[16];
int err;
/* 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;
/* add IEEE Organizationally Unique Identifier */
snprintf(str, sizeof(str), "OUI:%X%X%X", a1, a2, a3);
udev_builtin_hwdb_lookup(dev, str, test);
snprintf(str, sizeof(str), "%sx%x%x%x%x%x%x", prefix, a1, a2, a3, a4, a5, a6);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
if (err < 0)
return err;
return 0;
}
static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
const char *s;
unsigned int i;
const char *devtype;
const char *prefix = "en";
/* handle only ARPHRD_ETHER devices */
s = udev_device_get_sysattr_value(dev, "type");
if (!s)
return EXIT_FAILURE;
i = strtoul(s, NULL, 0);
if (i != 1)
return 0;
devtype = udev_device_get_devtype(dev);
if (devtype) {
if (streq("wlan", devtype))
prefix = "wl";
else if (streq("wwan", devtype))
prefix = "ww";
}
dev_pci(dev, prefix, test);
dev_mac(dev, prefix, test);
return EXIT_SUCCESS;
}
const struct udev_builtin udev_builtin_net_id = {
.name = "net_id",
.cmd = builtin_net_id,
.help = "network device properties",
};