#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <unistd.h>

#include <string.h>

#include <errno.h>

#include <net/if.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];

};

static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {

const char *index;

int idx;

/* ACPI _DSM -- device specific method for naming a PCI or PCI Express device */

index = udev_device_get_sysattr_value(names->pcidev, "acpi_index");

/* SMBIOS type 41 -- Onboard Devices Extended Information */

if (!index)

index = udev_device_get_sysattr_value(names->pcidev, "index");

if (!index)

return -ENOENT;

idx = strtoul(index, NULL, 0);

if (idx <= 0)

return -EINVAL;

snprintf(names->pci_onboard, sizeof(names->pci_onboard), "o%d", idx);

names->pci_onboard_label = udev_device_get_sysattr_value(names->pcidev, "label");

return 0;

}

static bool is_pci_multifunction(struct udev_device *dev) {

char filename[256];

FILE *f = NULL;

char config[64];

bool multi = 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;

/* bit 0-6 header type, bit 7 multi/single function device */

if ((config[PCI_HEADER_TYPE] & 0x80) != 0)

multi = true;

out:

if (f)

fclose(f);

return multi;

}

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_id = 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 multi-device index */

attr = udev_device_get_sysattr_value(dev, "dev_id");

if (attr)

dev_id = strtol(attr, NULL, 16);

/* 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%d", domain);

l = strpcpyf(&s, l, "p%ds%d", bus, slot);

if (func > 0 || is_pci_multifunction(names->pcidev))

l = strpcpyf(&s, l, "f%d", func);

if (dev_id > 0)

l = strpcpyf(&s, l, "d%d", dev_id);

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_id > 0)

l = strpcpyf(&s, l, "d%d", dev_id);

if (l == 0)

names->pci_path[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

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

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;

}

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 1: /* ARPHRD_ETHER */

prefix = "en";

break;

case 256: /* 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",

};