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-rw-r--r--src/udev/udev-builtin-net_id.c961
1 files changed, 961 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
new file mode 100644
index 0000000..d06a8c7
--- /dev/null
+++ b/src/udev/udev-builtin-net_id.c
@@ -0,0 +1,961 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+/*
+ * 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
+ *
+ * https://systemd.io/PREDICTABLE_INTERFACE_NAMES
+ *
+ * When the code here is changed, man/systemd.net-naming-scheme.xml must be updated too.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <linux/if.h>
+#include <linux/pci_regs.h>
+
+#include "alloc-util.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "netif-naming-scheme.h"
+#include "parse-util.h"
+#include "proc-cmdline.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "strxcpyx.h"
+#include "udev-builtin.h"
+
+#define ONBOARD_INDEX_MAX (16*1024-1)
+
+enum netname_type{
+ NET_UNDEF,
+ NET_PCI,
+ NET_USB,
+ NET_BCMA,
+ NET_VIRTIO,
+ NET_CCW,
+ NET_VIO,
+ NET_PLATFORM,
+ NET_NETDEVSIM,
+};
+
+struct netnames {
+ enum netname_type type;
+
+ uint8_t mac[6];
+ bool mac_valid;
+
+ sd_device *pcidev;
+ char pci_slot[ALTIFNAMSIZ];
+ char pci_path[ALTIFNAMSIZ];
+ char pci_onboard[ALTIFNAMSIZ];
+ const char *pci_onboard_label;
+
+ char usb_ports[ALTIFNAMSIZ];
+ char bcma_core[ALTIFNAMSIZ];
+ char ccw_busid[ALTIFNAMSIZ];
+ char vio_slot[ALTIFNAMSIZ];
+ char platform_path[ALTIFNAMSIZ];
+ char netdevsim_path[ALTIFNAMSIZ];
+};
+
+struct virtfn_info {
+ sd_device *physfn_pcidev;
+ char suffix[ALTIFNAMSIZ];
+};
+
+/* skip intermediate virtio devices */
+static sd_device *skip_virtio(sd_device *dev) {
+ sd_device *parent;
+
+ /* there can only ever be one virtio bus per parent device, so we can
+ * safely ignore any virtio buses. see
+ * http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html */
+ for (parent = dev; parent; ) {
+ const char *subsystem;
+
+ if (sd_device_get_subsystem(parent, &subsystem) < 0)
+ break;
+
+ if (!streq(subsystem, "virtio"))
+ break;
+
+ if (sd_device_get_parent(parent, &parent) < 0)
+ return NULL;
+ }
+
+ return parent;
+}
+
+static int get_virtfn_info(sd_device *dev, struct netnames *names, struct virtfn_info *ret) {
+ _cleanup_(sd_device_unrefp) sd_device *physfn_pcidev = NULL;
+ const char *physfn_link_file, *syspath;
+ _cleanup_free_ char *physfn_pci_syspath = NULL;
+ _cleanup_free_ char *virtfn_pci_syspath = NULL;
+ struct dirent *dent;
+ _cleanup_closedir_ DIR *dir = NULL;
+ char suffix[ALTIFNAMSIZ];
+ int r;
+
+ assert(dev);
+ assert(names);
+ assert(ret);
+
+ r = sd_device_get_syspath(names->pcidev, &syspath);
+ if (r < 0)
+ return r;
+
+ /* Check if this is a virtual function. */
+ physfn_link_file = strjoina(syspath, "/physfn");
+ r = chase_symlinks(physfn_link_file, NULL, 0, &physfn_pci_syspath, NULL);
+ if (r < 0)
+ return r;
+
+ /* Get physical function's pci device. */
+ r = sd_device_new_from_syspath(&physfn_pcidev, physfn_pci_syspath);
+ if (r < 0)
+ return r;
+
+ /* Find the virtual function number by finding the right virtfn link. */
+ dir = opendir(physfn_pci_syspath);
+ if (!dir)
+ return -errno;
+
+ FOREACH_DIRENT_ALL(dent, dir, break) {
+ _cleanup_free_ char *virtfn_link_file = NULL;
+
+ if (!startswith(dent->d_name, "virtfn"))
+ continue;
+
+ virtfn_link_file = path_join(physfn_pci_syspath, dent->d_name);
+ if (!virtfn_link_file)
+ return -ENOMEM;
+
+ if (chase_symlinks(virtfn_link_file, NULL, 0, &virtfn_pci_syspath, NULL) < 0)
+ continue;
+
+ if (streq(syspath, virtfn_pci_syspath)) {
+ if (!snprintf_ok(suffix, sizeof(suffix), "v%s", &dent->d_name[6]))
+ return -ENOENT;
+
+ break;
+ }
+ }
+ if (isempty(suffix))
+ return -ENOENT;
+
+ ret->physfn_pcidev = TAKE_PTR(physfn_pcidev);
+ strncpy(ret->suffix, suffix, sizeof(ret->suffix));
+
+ return 0;
+}
+
+/* retrieve on-board index number and label from firmware */
+static int dev_pci_onboard(sd_device *dev, struct netnames *names) {
+ unsigned long idx, dev_port = 0;
+ const char *attr, *port_name = NULL;
+ size_t l;
+ char *s;
+ int r;
+
+ /* ACPI _DSM — device specific method for naming a PCI or PCI Express device */
+ if (sd_device_get_sysattr_value(names->pcidev, "acpi_index", &attr) < 0) {
+ /* SMBIOS type 41 — Onboard Devices Extended Information */
+ r = sd_device_get_sysattr_value(names->pcidev, "index", &attr);
+ if (r < 0)
+ return r;
+ }
+
+ r = safe_atolu(attr, &idx);
+ if (r < 0)
+ return r;
+ if (idx == 0 && !naming_scheme_has(NAMING_ZERO_ACPI_INDEX))
+ return -EINVAL;
+
+ /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to
+ * report for example). Let's define a cut-off where we don't consider the index reliable anymore. We
+ * pick some arbitrary cut-off, which is somewhere beyond the realistic number of physical network
+ * interface a system might have. Ideally the kernel would already filter this crap for us, but it
+ * doesn't currently. */
+ if (idx > ONBOARD_INDEX_MAX)
+ return -ENOENT;
+
+ /* kernel provided port index for multiple ports on a single PCI function */
+ if (sd_device_get_sysattr_value(dev, "dev_port", &attr) >= 0)
+ dev_port = strtoul(attr, NULL, 10);
+
+ /* kernel provided front panel port name for multiple port PCI device */
+ (void) sd_device_get_sysattr_value(dev, "phys_port_name", &port_name);
+
+ s = names->pci_onboard;
+ l = sizeof(names->pci_onboard);
+ l = strpcpyf(&s, l, "o%lu", idx);
+ if (port_name)
+ l = strpcpyf(&s, l, "n%s", port_name);
+ else if (dev_port > 0)
+ l = strpcpyf(&s, l, "d%lu", dev_port);
+ if (l == 0)
+ names->pci_onboard[0] = '\0';
+
+ if (sd_device_get_sysattr_value(names->pcidev, "label", &names->pci_onboard_label) < 0)
+ names->pci_onboard_label = NULL;
+
+ return 0;
+}
+
+/* read the 256 bytes PCI configuration space to check the multi-function bit */
+static bool is_pci_multifunction(sd_device *dev) {
+ _cleanup_close_ int fd = -1;
+ const char *filename, *syspath;
+ uint8_t config[64];
+
+ if (sd_device_get_syspath(dev, &syspath) < 0)
+ return false;
+
+ filename = strjoina(syspath, "/config");
+ fd = open(filename, O_RDONLY | O_CLOEXEC);
+ if (fd < 0)
+ return false;
+ if (read(fd, &config, sizeof(config)) != sizeof(config))
+ return false;
+
+ /* bit 0-6 header type, bit 7 multi/single function device */
+ return config[PCI_HEADER_TYPE] & 0x80;
+}
+
+static bool is_pci_ari_enabled(sd_device *dev) {
+ const char *a;
+
+ if (sd_device_get_sysattr_value(dev, "ari_enabled", &a) < 0)
+ return false;
+
+ return streq(a, "1");
+}
+
+static bool is_pci_bridge(sd_device *dev) {
+ const char *v, *p;
+
+ if (sd_device_get_sysattr_value(dev, "modalias", &v) < 0)
+ return false;
+
+ if (!startswith(v, "pci:"))
+ return false;
+
+ p = strrchr(v, 's');
+ if (!p)
+ return false;
+ if (p[1] != 'c')
+ return false;
+
+ /* PCI device subclass 04 corresponds to PCI bridge */
+ return strneq(p + 2, "04", 2);
+}
+
+static int dev_pci_slot(sd_device *dev, struct netnames *names) {
+ unsigned long dev_port = 0;
+ unsigned domain, bus, slot, func;
+ int hotplug_slot = -1;
+ size_t l;
+ char *s;
+ const char *sysname, *attr, *port_name = NULL, *syspath;
+ _cleanup_(sd_device_unrefp) sd_device *pci = NULL;
+ sd_device *hotplug_slot_dev;
+ char slots[PATH_MAX];
+ _cleanup_closedir_ DIR *dir = NULL;
+ struct dirent *dent;
+ int r;
+
+ r = sd_device_get_sysname(names->pcidev, &sysname);
+ if (r < 0)
+ return r;
+
+ if (sscanf(sysname, "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4)
+ return -ENOENT;
+
+ if (naming_scheme_has(NAMING_NPAR_ARI) &&
+ is_pci_ari_enabled(names->pcidev))
+ /* ARI devices support up to 256 functions on a single device ("slot"), and interpret the
+ * traditional 5-bit slot and 3-bit function number as a single 8-bit function number,
+ * where the slot makes up the upper 5 bits. */
+ func += slot * 8;
+
+ /* kernel provided port index for multiple ports on a single PCI function */
+ if (sd_device_get_sysattr_value(dev, "dev_port", &attr) >= 0) {
+ dev_port = strtoul(attr, NULL, 10);
+ /* With older kernels IP-over-InfiniBand network interfaces sometimes erroneously
+ * provide the port number in the 'dev_id' sysfs attribute instead of 'dev_port',
+ * which thus stays initialized as 0. */
+ if (dev_port == 0 &&
+ sd_device_get_sysattr_value(dev, "type", &attr) >= 0) {
+ unsigned long type;
+
+ type = strtoul(attr, NULL, 10);
+ if (type == ARPHRD_INFINIBAND &&
+ sd_device_get_sysattr_value(dev, "dev_id", &attr) >= 0)
+ dev_port = strtoul(attr, NULL, 16);
+ }
+ }
+
+ /* kernel provided front panel port name for multi-port PCI device */
+ (void) sd_device_get_sysattr_value(dev, "phys_port_name", &port_name);
+
+ /* 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%u", domain);
+ l = strpcpyf(&s, l, "p%us%u", bus, slot);
+ if (func > 0 || is_pci_multifunction(names->pcidev))
+ l = strpcpyf(&s, l, "f%u", func);
+ if (port_name)
+ l = strpcpyf(&s, l, "n%s", port_name);
+ else if (dev_port > 0)
+ l = strpcpyf(&s, l, "d%lu", dev_port);
+ if (l == 0)
+ names->pci_path[0] = '\0';
+
+ /* ACPI _SUN — slot user number */
+ r = sd_device_new_from_subsystem_sysname(&pci, "subsystem", "pci");
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_syspath(pci, &syspath);
+ if (r < 0)
+ return r;
+ if (!snprintf_ok(slots, sizeof slots, "%s/slots", syspath))
+ return -ENAMETOOLONG;
+
+ dir = opendir(slots);
+ if (!dir)
+ return -errno;
+
+ hotplug_slot_dev = names->pcidev;
+ while (hotplug_slot_dev) {
+ if (sd_device_get_sysname(hotplug_slot_dev, &sysname) < 0)
+ continue;
+
+ FOREACH_DIRENT_ALL(dent, dir, break) {
+ int i;
+ char str[PATH_MAX];
+ _cleanup_free_ char *address = NULL;
+
+ if (dot_or_dot_dot(dent->d_name))
+ continue;
+
+ r = safe_atoi(dent->d_name, &i);
+ if (r < 0 || i <= 0)
+ continue;
+
+ /* match slot address with device by stripping the function */
+ if (snprintf_ok(str, sizeof str, "%s/%s/address", slots, dent->d_name) &&
+ read_one_line_file(str, &address) >= 0 &&
+ startswith(sysname, address)) {
+ hotplug_slot = i;
+
+ /* We found the match between PCI device and slot. However, we won't use the
+ * slot index if the device is a PCI bridge, because it can have other child
+ * devices that will try to claim the same index and that would create name
+ * collision. */
+ if (naming_scheme_has(NAMING_BRIDGE_NO_SLOT) && is_pci_bridge(hotplug_slot_dev))
+ hotplug_slot = 0;
+
+ break;
+ }
+ }
+ if (hotplug_slot >= 0)
+ break;
+ if (sd_device_get_parent_with_subsystem_devtype(hotplug_slot_dev, "pci", NULL, &hotplug_slot_dev) < 0)
+ break;
+ rewinddir(dir);
+ }
+
+ 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 (port_name)
+ l = strpcpyf(&s, l, "n%s", port_name);
+ else if (dev_port > 0)
+ l = strpcpyf(&s, l, "d%lu", dev_port);
+ if (l == 0)
+ names->pci_slot[0] = '\0';
+ }
+
+ return 0;
+}
+
+static int names_vio(sd_device *dev, struct netnames *names) {
+ sd_device *parent;
+ unsigned busid, slotid, ethid;
+ const char *syspath, *subsystem;
+ int r;
+
+ /* check if our direct parent is a VIO device with no other bus in-between */
+ r = sd_device_get_parent(dev, &parent);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_subsystem(parent, &subsystem);
+ if (r < 0)
+ return r;
+ if (!streq("vio", subsystem))
+ return -ENOENT;
+
+ /* The devices' $DEVPATH number is tied to (virtual) hardware (slot id
+ * selected in the HMC), thus this provides a reliable naming (e.g.
+ * "/devices/vio/30000002/net/eth1"); we ignore the bus number, as
+ * there should only ever be one bus, and then remove leading zeros. */
+ r = sd_device_get_syspath(dev, &syspath);
+ if (r < 0)
+ return r;
+
+ if (sscanf(syspath, "/sys/devices/vio/%4x%4x/net/eth%u", &busid, &slotid, &ethid) != 3)
+ return -EINVAL;
+
+ xsprintf(names->vio_slot, "v%u", slotid);
+ names->type = NET_VIO;
+ return 0;
+}
+
+#define _PLATFORM_TEST "/sys/devices/platform/vvvvPPPP"
+#define _PLATFORM_PATTERN4 "/sys/devices/platform/%4s%4x:%2x/net/eth%u"
+#define _PLATFORM_PATTERN3 "/sys/devices/platform/%3s%4x:%2x/net/eth%u"
+
+static int names_platform(sd_device *dev, struct netnames *names, bool test) {
+ sd_device *parent;
+ char vendor[5];
+ unsigned model, instance, ethid;
+ const char *syspath, *pattern, *validchars, *subsystem;
+ int r;
+
+ /* check if our direct parent is a platform device with no other bus in-between */
+ r = sd_device_get_parent(dev, &parent);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_subsystem(parent, &subsystem);
+ if (r < 0)
+ return r;
+
+ if (!streq("platform", subsystem))
+ return -ENOENT;
+
+ r = sd_device_get_syspath(dev, &syspath);
+ if (r < 0)
+ return r;
+
+ /* 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.
+ */
+
+ DISABLE_WARNING_FORMAT_NONLITERAL;
+ if (sscanf(syspath, pattern, vendor, &model, &instance, &ethid) != 4)
+ return -EINVAL;
+ REENABLE_WARNING;
+
+ 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(sd_device *dev, struct netnames *names) {
+ sd_device *parent;
+ struct netnames vf_names = {};
+ struct virtfn_info vf_info = {};
+ const char *subsystem;
+ int r;
+
+ assert(dev);
+ assert(names);
+
+ r = sd_device_get_parent(dev, &parent);
+ if (r < 0)
+ return r;
+ /* 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 (sd_device_get_subsystem(parent, &subsystem) >= 0 &&
+ streq("pci", subsystem)) {
+ names->type = NET_PCI;
+ names->pcidev = parent;
+ } else {
+ r = sd_device_get_parent_with_subsystem_devtype(dev, "pci", NULL, &names->pcidev);
+ if (r < 0)
+ return r;
+ }
+
+ if (naming_scheme_has(NAMING_SR_IOV_V) &&
+ 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);
+ sd_device_unref(vf_info.physfn_pcidev);
+ } else {
+ dev_pci_onboard(dev, names);
+ dev_pci_slot(dev, names);
+ }
+
+ return 0;
+}
+
+static int names_usb(sd_device *dev, struct netnames *names) {
+ sd_device *usbdev;
+ char name[256], *ports, *config, *interf, *s;
+ const char *sysname;
+ size_t l;
+ int r;
+
+ assert(dev);
+ assert(names);
+
+ r = sd_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface", &usbdev);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_sysname(usbdev, &sysname);
+ if (r < 0)
+ return r;
+
+ /* get USB port number chain, configuration, interface */
+ strscpy(name, sizeof(name), sysname);
+ 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(sd_device *dev, struct netnames *names) {
+ sd_device *bcmadev;
+ unsigned core;
+ const char *sysname;
+ int r;
+
+ assert(dev);
+ assert(names);
+
+ r = sd_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL, &bcmadev);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_sysname(bcmadev, &sysname);
+ if (r < 0)
+ return r;
+
+ /* bus num:core num */
+ if (sscanf(sysname, "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(sd_device *dev, struct netnames *names) {
+ sd_device *cdev;
+ const char *bus_id, *subsys;
+ size_t bus_id_len;
+ size_t bus_id_start;
+ int r;
+
+ assert(dev);
+ assert(names);
+
+ /* Retrieve the associated CCW device */
+ r = sd_device_get_parent(dev, &cdev);
+ if (r < 0)
+ return r;
+
+ /* skip virtio subsystem if present */
+ cdev = skip_virtio(cdev);
+ if (!cdev)
+ return -ENOENT;
+
+ r = sd_device_get_subsystem(cdev, &subsys);
+ if (r < 0)
+ return r;
+
+ /* Network devices are either single or grouped CCW devices */
+ if (!STR_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.
+ */
+ r = sd_device_get_sysname(cdev, &bus_id);
+ if (r < 0)
+ return r;
+
+ /* Check the length of the bus-ID. Rely on the fact 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(sd_device *dev, struct netnames *names) {
+ const char *s;
+ unsigned long i;
+ unsigned a1, a2, a3, a4, a5, a6;
+ int r;
+
+ /* Some kinds of devices tend to have hardware addresses
+ * that are impossible to use in an iface name.
+ */
+ r = sd_device_get_sysattr_value(dev, "type", &s);
+ if (r < 0)
+ return r;
+
+ 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 */
+ r = sd_device_get_sysattr_value(dev, "addr_assign_type", &s);
+ if (r < 0)
+ return r;
+ i = strtoul(s, NULL, 0);
+ if (i != 0)
+ return 0;
+
+ r = sd_device_get_sysattr_value(dev, "address", &s);
+ if (r < 0)
+ return r;
+ 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 names_netdevsim(sd_device *dev, struct netnames *names) {
+ sd_device *netdevsimdev;
+ const char *sysname;
+ unsigned addr;
+ const char *port_name = NULL;
+ int r;
+ bool ok;
+
+ if (!naming_scheme_has(NAMING_NETDEVSIM))
+ return 0;
+
+ assert(dev);
+ assert(names);
+
+ r = sd_device_get_parent_with_subsystem_devtype(dev, "netdevsim", NULL, &netdevsimdev);
+ if (r < 0)
+ return r;
+ r = sd_device_get_sysname(netdevsimdev, &sysname);
+ if (r < 0)
+ return r;
+
+ if (sscanf(sysname, "netdevsim%u", &addr) != 1)
+ return -EINVAL;
+
+ r = sd_device_get_sysattr_value(dev, "phys_port_name", &port_name);
+ if (r < 0)
+ return r;
+
+ ok = snprintf_ok(names->netdevsim_path, sizeof(names->netdevsim_path), "i%un%s", addr, port_name);
+ if (!ok)
+ return -ENOBUFS;
+
+ names->type = NET_NETDEVSIM;
+
+ return 0;
+}
+
+/* IEEE Organizationally Unique Identifier vendor string */
+static int ieee_oui(sd_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(sd_device *dev, int argc, char *argv[], bool test) {
+ const char *s, *p, *devtype, *prefix = "en";
+ struct netnames names = {};
+ unsigned long i;
+ int r;
+
+ /* handle only ARPHRD_ETHER, ARPHRD_SLIP and ARPHRD_INFINIBAND devices */
+ r = sd_device_get_sysattr_value(dev, "type", &s);
+ if (r < 0)
+ return r;
+
+ i = strtoul(s, NULL, 0);
+ switch (i) {
+ case ARPHRD_ETHER:
+ prefix = "en";
+ break;
+ case ARPHRD_INFINIBAND:
+ if (naming_scheme_has(NAMING_INFINIBAND))
+ prefix = "ib";
+ else
+ return 0;
+ break;
+ case ARPHRD_SLIP:
+ prefix = "sl";
+ break;
+ default:
+ return 0;
+ }
+
+ /* skip stacked devices, like VLANs, ... */
+ r = sd_device_get_sysattr_value(dev, "ifindex", &s);
+ if (r < 0)
+ return r;
+ r = sd_device_get_sysattr_value(dev, "iflink", &p);
+ if (r < 0)
+ return r;
+ if (!streq(s, p))
+ return 0;
+
+ if (sd_device_get_devtype(dev, &devtype) >= 0) {
+ if (streq("wlan", devtype))
+ prefix = "wl";
+ else if (streq("wwan", devtype))
+ prefix = "ww";
+ }
+
+ udev_builtin_add_property(dev, test, "ID_NET_NAMING_SCHEME", naming_scheme()->name);
+
+ r = names_mac(dev, &names);
+ if (r >= 0 && names.mac_valid) {
+ char str[ALTIFNAMSIZ];
+
+ 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 */
+ if (names_ccw(dev, &names) >= 0 && names.type == NET_CCW) {
+ char str[ALTIFNAMSIZ];
+
+ if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.ccw_busid))
+ udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
+ return 0;
+ }
+
+ /* get ibmveth/ibmvnic slot-based names. */
+ if (names_vio(dev, &names) >= 0 && names.type == NET_VIO) {
+ char str[ALTIFNAMSIZ];
+
+ if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.vio_slot))
+ udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
+ return 0;
+ }
+
+ /* get ACPI path names for ARM64 platform devices */
+ if (names_platform(dev, &names, test) >= 0 && names.type == NET_PLATFORM) {
+ char str[ALTIFNAMSIZ];
+
+ if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.platform_path))
+ udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
+ return 0;
+ }
+
+ /* get netdevsim path names */
+ if (names_netdevsim(dev, &names) >= 0 && names.type == NET_NETDEVSIM) {
+ char str[ALTIFNAMSIZ];
+
+ if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.netdevsim_path))
+ udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
+
+ return 0;
+ }
+
+ /* get PCI based path names, we compose only PCI based paths */
+ if (names_pci(dev, &names) < 0)
+ return 0;
+
+ /* plain PCI device */
+ if (names.type == NET_PCI) {
+ char str[ALTIFNAMSIZ];
+
+ 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",
+ naming_scheme_has(NAMING_LABEL_NOPREFIX) ? "" : 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);
+ return 0;
+ }
+
+ /* USB device */
+ if (names_usb(dev, &names) >= 0 && names.type == NET_USB) {
+ char str[ALTIFNAMSIZ];
+
+ 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);
+ return 0;
+ }
+
+ /* Broadcom bus */
+ if (names_bcma(dev, &names) >= 0 && names.type == NET_BCMA) {
+ char str[ALTIFNAMSIZ];
+
+ 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);
+ return 0;
+ }
+
+ return 0;
+}
+
+const UdevBuiltin udev_builtin_net_id = {
+ .name = "net_id",
+ .cmd = builtin_net_id,
+ .help = "Network device properties",
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-18 15:25:36 +0000