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
+ *
+ * two character prefixes based on the type of interface:
+ * en -- ethernet
+ * wl -- wlan
+ * ww -- wwan
+ *
+ * type of names:
+ * o<index> -- on-board device index number
+ * s<slot>[f<function>] -- hotplug slot index number
+ * x<MAC> -- MAC address
+ * p<bus>s<slot>[f<function>] -- PCI geographical location
+ *
+ * All multi-function devices will carry the [f<function>] number in the
+ * device name, including the function 0 device.
+ *
+ * examples:
+ * ID_NET_NAME_ONBOARD=eno1
+ * ID_NET_NAME_SLOT=ens1
+ * ID_NET_NAME_SLOT=ens2f0
+ * ID_NET_NAME_SLOT=ens2f1
+ * ID_NET_NAME_MAC=enxf0def180d479
+ * ID_NET_NAME_PATH=enp0s25
+ * ID_NET_NAME_PATH=enp19s3f0
+ * ID_NET_NAME_PATH=enp19s3f1
+ */
+
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
+#include <linux/pci_regs.h>
#include "udev.h"
-/* IEEE Organizationally Unique Identifier */
-static int lookup_OUI(struct udev_device *dev, bool test) {
- const char *addr;
- unsigned int a1, a2, a3;
- char oui[16];
+/* retrieve on-board index number and label from firmware */
+static int dev_pci_onboard(struct udev_device *dev, struct udev_device *parent, const char *prefix, bool test) {
+ const char *index;
+ int idx;
+ const char *label;
+ char s[16];
+ int err;
+
+ /* ACPI _DSM -- device specific method for naming a PCI or PCI Express device */
+ index = udev_device_get_sysattr_value(parent, "acpi_index");
+ /* SMBIOS type 41 -- Onboard Devices Extended Information */
+ if (!index)
+ index = udev_device_get_sysattr_value(parent, "index");
+ if (!index)
+ return -ENOENT;
+ idx = strtoul(index, NULL, 0);
+ if (idx <= 0)
+ return -EINVAL;
+ snprintf(s, sizeof(s), "%so%d", prefix, idx);
+ err = udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", s);
+ if (err < 0)
+ return err;
+
+ label = udev_device_get_sysattr_value(parent, "label");
+ if (label) {
+ err = udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", label);
+ if (err < 0)
+ return err;
+ }
+ return 0;
+}
+
+/* read the 256 bytes PCI configuration space to check the multi-function bit */
+static bool is_pci_singlefunction(struct udev_device *dev) {
+ char filename[256];
+ FILE *f;
+ char config[256];
+ bool single = false;
+
+ snprintf(filename, sizeof(filename), "%s/config", udev_device_get_syspath(dev));
+ f = fopen(filename, "re");
+ if (!f)
+ goto out;
+ if (fread(&config, sizeof(config), 1, f) != 1)
+ goto out;
- addr = udev_device_get_sysattr_value(dev, "address");
- if (!addr)
+ /* bit 0-6 header type, bit 7 multi/single function device */
+ if ((config[PCI_HEADER_TYPE] & 0x80) == 0)
+ single = true;
+out:
+ fclose(f);
+ return single;
+}
+
+static int dev_pci_slot(struct udev_device *dev, struct udev_device *parent, const char *prefix, bool test) {
+ struct udev *udev = udev_device_get_udev(dev);
+ unsigned int bus;
+ unsigned int slot;
+ unsigned int func;
+ struct udev_device *pci = NULL;
+ char slots[256];
+ DIR *dir;
+ struct dirent *dent;
+ char str[256];
+ int hotplug_slot = 0;
+ int err = 0;
+
+ /* compose a name based on the raw kernel's PCI bus, slot numbers */
+ if (sscanf(udev_device_get_sysname(parent), "0000:%x:%x.%d", &bus, &slot, &func) != 3)
return -ENOENT;
+ if (func == 0 && is_pci_singlefunction(parent))
+ snprintf(str, sizeof(str), "%sp%ds%d", prefix, bus, slot);
+ else
+ 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;
+
+ /* 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;
+ }
- if (sscanf(addr, "%x:%x:%x:", &a1, &a2, &a3) != 3)
+ 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 (strncmp(address, udev_device_get_sysname(parent), strlen(address)) == 0)
+ hotplug_slot = i;
+ free(address);
+ }
+
+ if (hotplug_slot > 0)
+ break;
+ }
+ closedir(dir);
+
+ if (hotplug_slot > 0) {
+ if (func == 0 && is_pci_singlefunction(parent))
+ snprintf(str, sizeof(str), "%ss%d", prefix, hotplug_slot);
+ else
+ snprintf(str, sizeof(str), "%ss%df%d", prefix, hotplug_slot, func);
+ err = udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
+ }
+out:
+ udev_device_unref(pci);
+ return err;
+}
+
+static int dev_pci(struct udev_device *dev, const char *prefix, bool test) {
+ struct udev_device *parent;
+
+ /* skip other buses than direct PCI parents */
+ parent = udev_device_get_parent(dev);
+ if (!parent || !streq("pci", udev_device_get_subsystem(parent)))
+ return -ENOENT;
+
+ dev_pci_onboard(dev, parent, prefix, test);
+ dev_pci_slot(dev, parent, prefix, test);
+ 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];
+
+ /* 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;
- snprintf(oui, sizeof(oui), "OUI:%X%X%X", a1, a2, a3);
- return udev_builtin_hwdb_lookup(dev, oui, test);
+ /*
+ * IEEE Organizationally Unique Identifier vendor string
+ * skip commonly misused 00:00:00 (Xerox) prefix
+ */
+ if (a1 + a2 + a3 > 0) {
+ snprintf(str, sizeof(str), "OUI:%02X%02X%02X%02X%02X%02X", a1, a2, a3, a4, a5, a6);
+ udev_builtin_hwdb_lookup(dev, str, test);
+ }
+
+ snprintf(str, sizeof(str), "%sx%02x%02x%02x%02x%02x%02x", prefix, a1, a2, a3, a4, a5, a6);
+ return udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
}
static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
- lookup_OUI(dev, 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;
}
~ianmdlvl / elogind.git / blobdiff