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udev: net - add device naming properties
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@ -17,6 +17,17 @@
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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/*
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* eno<index> -- ethernet on-board
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* ID_NET_NAME_FIRMWARE=eno1
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*
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* enp<pci bus number>s<slot>f<function> -- physical location/path
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* ID_NET_NAME_PATH=enp19s0f0
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*
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* enm<MAC address> -- MAC address
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* ID_NET_NAME_MAC=enxf0def180d479
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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@ -26,25 +37,110 @@
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#include "udev.h"
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/* IEEE Organizationally Unique Identifier */
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static int lookup_OUI(struct udev_device *dev, bool test) {
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const char *addr;
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unsigned int a1, a2, a3;
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char oui[16];
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static int dev_pci(struct udev_device *dev, const char *prefix, bool test) {
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struct udev_device *d;
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unsigned int bus;
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unsigned int slot;
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unsigned int func;
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const char *index;
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int err;
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addr = udev_device_get_sysattr_value(dev, "address");
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if (!addr)
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/* skip other buses than direct PCI parents */
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d = udev_device_get_parent(dev);
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if (!d || !streq("pci", udev_device_get_subsystem(d)))
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return -ENOENT;
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if (sscanf(addr, "%x:%x:%x:", &a1, &a2, &a3) != 3)
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/* find SMBIOS type 41 entries for on-board devices */
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index = udev_device_get_sysattr_value(d, "index");
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if (index) {
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unsigned int idx;
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idx = strtoul(index, NULL, 0);
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if (idx > 0) {
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const char *label;
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char s[16];
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snprintf(s, sizeof(s), "%so%d", prefix, idx);
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udev_builtin_add_property(dev, test, "ID_NET_NAME_FIRMWARE", s);
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label = udev_device_get_sysattr_value(d, "label");
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if (label)
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udev_builtin_add_property(dev, test, "ID_NET_LABEL_FIRMWARE", label);
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}
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}
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/* compose a name based on the PCI bus location */
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if (sscanf(udev_device_get_sysname(d), "0000:%x:%x.%d", &bus, &slot, &func) == 3) {
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char str[16];
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snprintf(str, sizeof(str), "%sp%ds%df%d", prefix, bus, slot, func);
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err = udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static int dev_mac(struct udev_device *dev, const char *prefix, bool test) {
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const char *s;
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unsigned int i;
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unsigned int a1, a2, a3, a4, a5, a6;
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char str[16];
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int err;
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/* check for NET_ADDR_PERM, skip random MAC addresses */
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s = udev_device_get_sysattr_value(dev, "addr_assign_type");
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if (!s)
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return EXIT_FAILURE;
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i = strtoul(s, NULL, 0);
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if (i != 0)
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return 0;
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s = udev_device_get_sysattr_value(dev, "address");
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if (!s)
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return -ENOENT;
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if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
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return -EINVAL;
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snprintf(oui, sizeof(oui), "OUI:%X%X%X", a1, a2, a3);
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return udev_builtin_hwdb_lookup(dev, oui, test);
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/* skip empty MAC addresses */
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if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
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return -EINVAL;
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/* add IEEE Organizationally Unique Identifier */
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snprintf(str, sizeof(str), "OUI:%X%X%X", a1, a2, a3);
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udev_builtin_hwdb_lookup(dev, str, test);
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snprintf(str, sizeof(str), "%sx%x%x%x%x%x%x", prefix, a1, a2, a3, a4, a5, a6);
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err = udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
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if (err < 0)
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return err;
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return 0;
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}
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static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
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lookup_OUI(dev, test);
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const char *s;
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unsigned int i;
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const char *devtype;
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const char *prefix = "en";
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/* handle only ARPHRD_ETHER devices */
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s = udev_device_get_sysattr_value(dev, "type");
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if (!s)
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return EXIT_FAILURE;
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i = strtoul(s, NULL, 0);
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if (i != 1)
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return 0;
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devtype = udev_device_get_devtype(dev);
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if (devtype) {
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if (streq("wlan", devtype))
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prefix = "wl";
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else if (streq("wwan", devtype))
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prefix = "ww";
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}
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dev_pci(dev, prefix, test);
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dev_mac(dev, prefix, test);
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return EXIT_SUCCESS;
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}
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