diff options
Diffstat (limited to 'src/udev/udev-builtin-net_id.c')
| -rw-r--r-- | src/udev/udev-builtin-net_id.c | 1366 |
1 files changed, 1366 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..91b4008 --- /dev/null +++ b/src/udev/udev-builtin-net_id.c @@ -0,0 +1,1366 @@ +/* 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 <stdarg.h> +#include <unistd.h> +#include <linux/if.h> +#include <linux/if_arp.h> +#include <linux/netdevice.h> +#include <linux/pci_regs.h> + +#include "alloc-util.h" +#include "chase.h" +#include "device-private.h" +#include "device-util.h" +#include "dirent-util.h" +#include "ether-addr-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "glyph-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_14BIT_INDEX_MAX ((1U << 14) - 1) +#define ONBOARD_16BIT_INDEX_MAX ((1U << 16) - 1) + +/* skip intermediate virtio devices */ +static sd_device *device_skip_virtio(sd_device *dev) { + /* 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 */ + while (dev) { + const char *subsystem; + + if (sd_device_get_subsystem(dev, &subsystem) < 0) + break; + + if (!streq(subsystem, "virtio")) + break; + + if (sd_device_get_parent(dev, &dev) < 0) + return NULL; + } + + return dev; +} + +static int get_matching_parent( + sd_device *dev, + char * const *parent_subsystems, + bool skip_virtio, + sd_device **ret) { + + sd_device *parent; + int r; + + assert(dev); + + r = sd_device_get_parent(dev, &parent); + if (r < 0) + return r; + + if (skip_virtio) { + /* skip virtio subsystem if present */ + parent = device_skip_virtio(parent); + if (!parent) + return -ENODEV; + } + + if (!strv_isempty(parent_subsystems)) { + const char *subsystem; + + /* check if our direct parent is in an expected subsystem. */ + r = sd_device_get_subsystem(parent, &subsystem); + if (r < 0) + return r; + + if (!strv_contains(parent_subsystems, subsystem)) + return -ENODEV; + } + + if (ret) + *ret = parent; + + return 0; +} + +static int get_first_syspath_component(sd_device *dev, const char *prefix, char **ret) { + _cleanup_free_ char *buf = NULL; + const char *syspath, *p, *q; + int r; + + assert(dev); + assert(prefix); + assert(ret); + + r = sd_device_get_syspath(dev, &syspath); + if (r < 0) + return r; + + p = path_startswith(syspath, prefix); + if (!p) + return -EINVAL; + + r = path_find_first_component(&p, /* accept_dot_dot = */ false, &q); + if (r < 0) + return r; + + buf = strndup(q, r); + if (!buf) + return -ENOMEM; + + *ret = TAKE_PTR(buf); + return r; /* return the length of the string */ +} + +static int get_virtfn_info(sd_device *pcidev, sd_device **ret_physfn_pcidev, char **ret_suffix) { + _cleanup_(sd_device_unrefp) sd_device *physfn_pcidev = NULL; + const char *syspath, *name; + int r; + + assert(pcidev); + assert(ret_physfn_pcidev); + assert(ret_suffix); + + r = sd_device_get_syspath(pcidev, &syspath); + if (r < 0) + return r; + + /* Get physical function's pci device. */ + r = sd_device_new_child(&physfn_pcidev, pcidev, "physfn"); + if (r < 0) + return r; + + /* Find the virtual function number by finding the right virtfn link. */ + FOREACH_DEVICE_CHILD_WITH_SUFFIX(physfn_pcidev, child, name) { + const char *n, *s; + + /* Only accepts e.g. virtfn0, virtfn1, and so on. */ + n = startswith(name, "virtfn"); + if (isempty(n) || !in_charset(n, DIGITS)) + continue; + + if (sd_device_get_syspath(child, &s) < 0) + continue; + + if (streq(s, syspath)) { + char *suffix; + + suffix = strjoin("v", n); + if (!suffix) + return -ENOMEM; + + *ret_physfn_pcidev = sd_device_ref(physfn_pcidev); + *ret_suffix = suffix; + return 0; + } + } + + return -ENOENT; +} + +static int get_dev_port(sd_device *dev, bool fallback_to_dev_id, unsigned *ret) { + unsigned v; + int r; + + assert(dev); + assert(ret); + + /* Get kernel provided port index for the case when multiple ports on a single PCI function. */ + + r = device_get_sysattr_unsigned(dev, "dev_port", &v); + if (r < 0) + return r; + if (r > 0) { + /* Found a positive index. Let's use it. */ + *ret = v; + return 1; /* positive */ + } + assert(v == 0); + + /* 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 (fallback_to_dev_id) { + unsigned iftype; + + r = device_get_sysattr_unsigned(dev, "type", &iftype); + if (r < 0) + return r; + + fallback_to_dev_id = (iftype == ARPHRD_INFINIBAND); + } + + if (fallback_to_dev_id) + return device_get_sysattr_unsigned(dev, "dev_id", ret); + + /* Otherwise, return the original index 0. */ + *ret = 0; + return 0; /* zero */ +} + +static int get_port_specifier(sd_device *dev, bool fallback_to_dev_id, char **ret) { + const char *phys_port_name; + unsigned dev_port; + char *buf; + int r; + + assert(dev); + assert(ret); + + /* First, try to use the kernel provided front panel port name for multiple port PCI device. */ + r = sd_device_get_sysattr_value(dev, "phys_port_name", &phys_port_name); + if (r >= 0 && !isempty(phys_port_name)) { + if (naming_scheme_has(NAMING_SR_IOV_R)) { + int vf_id = -1; + + /* Check if phys_port_name indicates virtual device representor. */ + (void) sscanf(phys_port_name, "pf%*uvf%d", &vf_id); + + if (vf_id >= 0) { + /* For VF representor append 'r<VF_NUM>'. */ + if (asprintf(&buf, "r%d", vf_id) < 0) + return log_oom_debug(); + + *ret = buf; + return 1; + } + } + + /* Otherwise, use phys_port_name as is. */ + buf = strjoin("n", phys_port_name); + if (!buf) + return log_oom_debug(); + + *ret = buf; + return 1; + } + + /* Then, try to use the kernel provided port index for the case when multiple ports on a single PCI + * function. */ + r = get_dev_port(dev, fallback_to_dev_id, &dev_port); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get device port index: %m"); + if (r > 0) { + assert(dev_port > 0); + if (asprintf(&buf, "d%u", dev_port) < 0) + return log_oom_debug(); + + *ret = buf; + return 1; + } + + *ret = NULL; + return 0; +} + +static bool is_valid_onboard_index(unsigned idx) { + /* 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. The initial cut-off value (2^14-1) was too conservative for s390 PCI which + * allows for index values up 2^16-1 which is now enabled with the NAMING_16BIT_INDEX naming flag. */ + return idx <= (naming_scheme_has(NAMING_16BIT_INDEX) ? ONBOARD_16BIT_INDEX_MAX : ONBOARD_14BIT_INDEX_MAX); +} + +static int pci_get_onboard_index(sd_device *dev, unsigned *ret) { + unsigned idx; + int r; + + assert(dev); + assert(ret); + + /* ACPI _DSM — device specific method for naming a PCI or PCI Express device */ + r = device_get_sysattr_unsigned(dev, "acpi_index", &idx); + if (r < 0) + /* SMBIOS type 41 — Onboard Devices Extended Information */ + r = device_get_sysattr_unsigned(dev, "index", &idx); + if (r < 0) + return log_device_debug_errno(dev, r, "Could not obtain onboard index: %m"); + + if (idx == 0 && !naming_scheme_has(NAMING_ZERO_ACPI_INDEX)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "Naming scheme does not allow onboard index==0."); + if (!is_valid_onboard_index(idx)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENOENT), + "Not a valid onboard index: %u", idx); + + *ret = idx; + return 0; +} + +static int names_pci_onboard(sd_device *dev, sd_device *pci_dev, const char *prefix, const char *suffix, bool test) { + _cleanup_free_ char *port = NULL; + unsigned idx = 0; /* avoid false maybe-uninitialized warning */ + int r; + + assert(dev); + assert(pci_dev); + assert(prefix); + + /* retrieve on-board index number from firmware */ + r = pci_get_onboard_index(pci_dev, &idx); + if (r < 0) + return r; + + r = get_port_specifier(dev, /* fallback_to_dev_id = */ false, &port); + if (r < 0) + return r; + + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%so%u%s%s", prefix, idx, strempty(port), strempty(suffix))) + udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str); + + log_device_debug(dev, "Onboard index identifier: index=%u port=%s %s %s", + idx, strna(port), + special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), empty_to_na(str)); + + return 0; +} + +static int names_pci_onboard_label(sd_device *dev, sd_device *pci_dev, const char *prefix, bool test) { + const char *label; + int r; + + assert(dev); + assert(prefix); + + /* retrieve on-board label from firmware */ + r = sd_device_get_sysattr_value(pci_dev, "label", &label); + if (r < 0) + return log_device_debug_errno(pci_dev, r, "Failed to get PCI onboard label: %m"); + + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%s%s", + naming_scheme_has(NAMING_LABEL_NOPREFIX) ? "" : prefix, + label)) + udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str); + + log_device_debug(dev, "Onboard label from PCI device: %s", label); + return 0; +} + +/* read the 256 bytes PCI configuration space to check the multi-function bit */ +static int is_pci_multifunction(sd_device *dev) { + _cleanup_free_ uint8_t *config = NULL; + const char *filename, *syspath; + size_t len; + int r; + + assert(dev); + + r = sd_device_get_syspath(dev, &syspath); + if (r < 0) + return r; + + filename = strjoina(syspath, "/config"); + r = read_virtual_file(filename, PCI_HEADER_TYPE + 1, (char **) &config, &len); + if (r < 0) + return r; + if (len < PCI_HEADER_TYPE + 1) + return -EINVAL; + +#ifndef PCI_HEADER_TYPE_MULTIFUNC +#define PCI_HEADER_TYPE_MULTIFUNC 0x80 +#endif + + /* bit 0-6 header type, bit 7 multi/single function device */ + return config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTIFUNC; +} + +static bool is_pci_ari_enabled(sd_device *dev) { + assert(dev); + + return device_get_sysattr_bool(dev, "ari_enabled") > 0; +} + +static bool is_pci_bridge(sd_device *dev) { + const char *v, *p; + + assert(dev); + + 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 */ + bool b = strneq(p + 2, "04", 2); + if (b) + log_device_debug(dev, "Device is a PCI bridge."); + return b; +} + +static int parse_hotplug_slot_from_function_id(sd_device *dev, int slots_dirfd, uint32_t *ret) { + uint64_t function_id; + char filename[NAME_MAX+1]; + const char *attr; + int r; + + /* The <sysname>/function_id attribute is unique to the s390 PCI driver. If present, we know that the + * slot's directory name for this device is /sys/bus/pci/slots/XXXXXXXX/ where XXXXXXXX is the fixed + * length 8 hexadecimal character string representation of function_id. Therefore we can short cut + * here and just check for the existence of the slot directory. As this directory has to exist, we're + * emitting a debug message for the unlikely case it's not found. Note that the domain part doesn't + * belong to the slot name here because there's a 1-to-1 relationship between PCI function and its + * hotplug slot. See https://docs.kernel.org/s390/pci.html for more details. */ + + assert(dev); + assert(slots_dirfd >= 0); + assert(ret); + + if (!naming_scheme_has(NAMING_SLOT_FUNCTION_ID)) { + *ret = 0; + return 0; + } + + if (sd_device_get_sysattr_value(dev, "function_id", &attr) < 0) { + *ret = 0; + return 0; + } + + r = safe_atou64(attr, &function_id); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to parse function_id, ignoring: %s", attr); + + if (function_id <= 0 || function_id > UINT32_MAX) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "Invalid function id (0x%"PRIx64"), ignoring.", + function_id); + + if (!snprintf_ok(filename, sizeof(filename), "%08"PRIx64, function_id)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENAMETOOLONG), + "PCI slot path is too long, ignoring."); + + if (faccessat(slots_dirfd, filename, F_OK, 0) < 0) + return log_device_debug_errno(dev, errno, "Cannot access %s under pci slots, ignoring: %m", filename); + + *ret = (uint32_t) function_id; + return 1; /* Found. We should ignore domain part. */ +} + +static int pci_get_hotplug_slot_from_address( + sd_device *dev, + sd_device *pci, + DIR *dir, + uint32_t *ret) { + + const char *sysname; + int r; + + assert(dev); + assert(pci); + assert(dir); + assert(ret); + + r = sd_device_get_sysname(dev, &sysname); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); + + rewinddir(dir); + FOREACH_DIRENT_ALL(de, dir, break) { + _cleanup_free_ char *path = NULL; + const char *address; + uint32_t slot; + + if (dot_or_dot_dot(de->d_name)) + continue; + + if (de->d_type != DT_DIR) + continue; + + r = safe_atou32(de->d_name, &slot); + if (r < 0 || slot <= 0) + continue; + + path = path_join("slots", de->d_name, "address"); + if (!path) + return log_oom_debug(); + + if (sd_device_get_sysattr_value(pci, path, &address) < 0) + continue; + + /* match slot address with device by stripping the function */ + if (!startswith(sysname, address)) + continue; + + *ret = slot; + return 1; /* found */ + } + + *ret = 0; + return 0; /* not found */ +} + +static int pci_get_hotplug_slot(sd_device *dev, uint32_t *ret) { + _cleanup_(sd_device_unrefp) sd_device *pci = NULL; + _cleanup_closedir_ DIR *dir = NULL; + int r; + + assert(dev); + assert(ret); + + /* ACPI _SUN — slot user number */ + r = sd_device_new_from_subsystem_sysname(&pci, "subsystem", "pci"); + if (r < 0) + return log_debug_errno(r, "Failed to create sd_device object for pci subsystem: %m"); + + r = device_opendir(pci, "slots", &dir); + if (r < 0) + return log_device_debug_errno(dev, r, "Cannot open 'slots' subdirectory: %m"); + + for (sd_device *slot_dev = dev; slot_dev; ) { + uint32_t slot = 0; /* avoid false maybe-uninitialized warning */ + + r = parse_hotplug_slot_from_function_id(slot_dev, dirfd(dir), &slot); + if (r < 0) + return r; + if (r > 0) { + *ret = slot; + return 1; /* domain should be ignored. */ + } + + r = pci_get_hotplug_slot_from_address(slot_dev, pci, dir, &slot); + if (r < 0) + return r; + if (r > 0) { + /* 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(slot_dev)) { + if (naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT) && is_pci_multifunction(dev) <= 0) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ESTALE), + "Not using slot information because the PCI device associated with " + "the hotplug slot is a bridge and the PCI device has a single function."); + + if (!naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ESTALE), + "Not using slot information because the PCI device is a bridge."); + } + + *ret = slot; + return 0; /* domain can be still used. */ + } + + if (sd_device_get_parent_with_subsystem_devtype(slot_dev, "pci", NULL, &slot_dev) < 0) + break; + } + + return -ENOENT; +} + +static int get_pci_slot_specifiers( + sd_device *dev, + char **ret_domain, + char **ret_bus_and_slot, + char **ret_func) { + + _cleanup_free_ char *domain_spec = NULL, *bus_and_slot_spec = NULL, *func_spec = NULL; + unsigned domain, bus, slot, func; + const char *sysname; + int r; + + assert(dev); + assert(ret_domain); + assert(ret_bus_and_slot); + assert(ret_func); + + r = sd_device_get_sysname(dev, &sysname); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); + + r = sscanf(sysname, "%x:%x:%x.%u", &domain, &bus, &slot, &func); + if (r != 4) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "Failed to parse slot information from PCI device sysname."); + + if (naming_scheme_has(NAMING_NPAR_ARI) && + is_pci_ari_enabled(dev)) + /* 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; + + if (domain > 0 && asprintf(&domain_spec, "P%u", domain) < 0) + return log_oom_debug(); + + if (asprintf(&bus_and_slot_spec, "p%us%u", bus, slot) < 0) + return log_oom_debug(); + + if ((func > 0 || is_pci_multifunction(dev) > 0) && + asprintf(&func_spec, "f%u", func) < 0) + return log_oom_debug(); + + *ret_domain = TAKE_PTR(domain_spec); + *ret_bus_and_slot = TAKE_PTR(bus_and_slot_spec); + *ret_func = TAKE_PTR(func_spec); + return 0; +} + +static int names_pci_slot(sd_device *dev, sd_device *pci_dev, const char *prefix, const char *suffix, bool test) { + _cleanup_free_ char *domain = NULL, *bus_and_slot = NULL, *func = NULL, *port = NULL; + uint32_t hotplug_slot = 0; /* avoid false maybe-uninitialized warning */ + char str[ALTIFNAMSIZ]; + int r; + + assert(dev); + assert(pci_dev); + assert(prefix); + + r = get_pci_slot_specifiers(pci_dev, &domain, &bus_and_slot, &func); + if (r < 0) + return r; + + r = get_port_specifier(dev, /* fallback_to_dev_id = */ true, &port); + if (r < 0) + return r; + + /* compose a name based on the raw kernel's PCI bus, slot numbers */ + if (snprintf_ok(str, sizeof str, "%s%s%s%s%s%s", + prefix, strempty(domain), bus_and_slot, strempty(func), strempty(port), strempty(suffix))) + udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str); + + log_device_debug(dev, "PCI path identifier: domain=%s bus_and_slot=%s func=%s port=%s %s %s", + strna(domain), bus_and_slot, strna(func), strna(port), + special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), empty_to_na(str)); + + r = pci_get_hotplug_slot(pci_dev, &hotplug_slot); + if (r < 0) + return r; + if (r > 0) + /* If the hotplug slot is found through the function ID, then drop the domain from the name. + * See comments in parse_hotplug_slot_from_function_id(). */ + domain = mfree(domain); + + if (snprintf_ok(str, sizeof str, "%s%ss%"PRIu32"%s%s%s", + prefix, strempty(domain), hotplug_slot, strempty(func), strempty(port), strempty(suffix))) + udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str); + + log_device_debug(dev, "Slot identifier: domain=%s slot=%"PRIu32" func=%s port=%s %s %s", + strna(domain), hotplug_slot, strna(func), strna(port), + special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), empty_to_na(str)); + + return 0; +} + +static int names_vio(sd_device *dev, const char *prefix, bool test) { + _cleanup_free_ char *s = NULL; + unsigned slotid; + int r; + + assert(dev); + assert(prefix); + + /* get ibmveth/ibmvnic slot-based names. */ + + /* check if our direct parent is a VIO device with no other bus in-between */ + if (get_matching_parent(dev, STRV_MAKE("vio"), /* skip_virtio = */ false, NULL) < 0) + return 0; + + log_device_debug(dev, "Parent device is in the vio subsystem."); + + /* 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 = get_first_syspath_component(dev, "/sys/devices/vio/", &s); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get VIO bus ID and slot ID: %m"); + + if (r != 8) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "VIO bus ID and slot ID have invalid length: %s", s); + + if (!in_charset(s, HEXDIGITS)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "VIO bus ID and slot ID contain invalid characters: %s", s); + + /* Parse only slot ID (the last 4 hexdigits). */ + r = safe_atou_full(s + 4, 16, &slotid); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to parse VIO slot from '%s': %m", s); + + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%sv%u", prefix, slotid)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str); + log_device_debug(dev, "Vio slot identifier: slotid=%u %s %s", + slotid, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix)); + return 0; +} + +static int names_platform(sd_device *dev, const char *prefix, bool test) { + _cleanup_free_ char *p = NULL; + const char *validchars; + char *vendor, *model_str, *instance_str; + unsigned model, instance; + int r; + + assert(dev); + assert(prefix); + + /* get ACPI path names for ARM64 platform devices */ + + /* check if our direct parent is a platform device with no other bus in-between */ + if (get_matching_parent(dev, STRV_MAKE("platform"), /* skip_virtio = */ false, NULL) < 0) + return 0; + + log_device_debug(dev, "Parent device is in the platform subsystem."); + + r = get_first_syspath_component(dev, "/sys/devices/platform/", &p); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get platform ID: %m"); + + /* 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 hexadecimal model number : instance id. */ + if (r == 10 && p[7] == ':') { + /* 3 char vendor string */ + vendor = strndupa(p, 3); + model_str = strndupa(p + 3, 4); + instance_str = strndupa(p + 8, 2); + validchars = UPPERCASE_LETTERS; + } else if (r == 11 && p[8] == ':') { + /* 4 char vendor string */ + vendor = strndupa(p, 4); + model_str = strndupa(p + 4, 4); + instance_str = strndupa(p + 9, 2); + validchars = UPPERCASE_LETTERS DIGITS; + } else + return -EOPNOTSUPP; + + if (!in_charset(vendor, validchars)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENOENT), + "Platform vendor contains invalid characters: %s", vendor); + + ascii_strlower(vendor); + + r = safe_atou_full(model_str, 16, &model); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to parse model number \"%s\": %m", model_str); + + r = safe_atou_full(instance_str, 16, &instance); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to parse instance id \"%s\": %m", instance_str); + + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%sa%s%xi%u", prefix, vendor, model, instance)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str); + log_device_debug(dev, "Platform identifier: vendor=%s model=%x instance=%u %s %s", + vendor, model, instance, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix)); + return 0; +} + +static int names_devicetree(sd_device *dev, const char *prefix, bool test) { + _cleanup_(sd_device_unrefp) sd_device *aliases_dev = NULL, *ofnode_dev = NULL, *devicetree_dev = NULL; + const char *ofnode_path, *ofnode_syspath, *devicetree_syspath; + sd_device *parent; + int r; + + assert(dev); + assert(prefix); + + if (!naming_scheme_has(NAMING_DEVICETREE_ALIASES)) + return 0; + + /* only ethernet supported for now */ + if (!streq(prefix, "en")) + return -EOPNOTSUPP; + + /* check if our direct parent has an of_node */ + r = sd_device_get_parent(dev, &parent); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get parent device: %m"); + + r = sd_device_new_child(&ofnode_dev, parent, "of_node"); + if (r < 0) + return log_device_debug_errno(parent, r, "Failed to get 'of_node' child device: %m"); + + r = sd_device_get_syspath(ofnode_dev, &ofnode_syspath); + if (r < 0) + return log_device_debug_errno(ofnode_dev, r, "Failed to get syspath: %m"); + + /* /proc/device-tree should be a symlink to /sys/firmware/devicetree/base. */ + r = sd_device_new_from_path(&devicetree_dev, "/proc/device-tree"); + if (r < 0) + return log_debug_errno(r, "Failed to create sd-device object from '/proc/device-tree': %m"); + + r = sd_device_get_syspath(devicetree_dev, &devicetree_syspath); + if (r < 0) + return log_device_debug_errno(devicetree_dev, r, "Failed to get syspath: %m"); + + /* + * Example paths: + * devicetree_syspath = /sys/firmware/devicetree/base + * ofnode_syspath = /sys/firmware/devicetree/base/soc/ethernet@deadbeef + * ofnode_path = soc/ethernet@deadbeef + */ + ofnode_path = path_startswith(ofnode_syspath, devicetree_syspath); + if (!ofnode_path) + return log_device_debug_errno(ofnode_dev, SYNTHETIC_ERRNO(EINVAL), + "The device '%s' is not a child device of '%s': %m", + ofnode_syspath, devicetree_syspath); + + /* Get back our leading / to match the contents of the aliases */ + ofnode_path--; + assert(path_is_absolute(ofnode_path)); + + r = sd_device_new_child(&aliases_dev, devicetree_dev, "aliases"); + if (r < 0) + return log_device_debug_errno(devicetree_dev, r, + "Failed to get 'aliases' child device: %m"); + + FOREACH_DEVICE_SYSATTR(aliases_dev, alias) { + const char *alias_path, *alias_index, *conflict; + unsigned i; + + alias_index = startswith(alias, "ethernet"); + if (!alias_index) + continue; + + if (sd_device_get_sysattr_value(aliases_dev, alias, &alias_path) < 0) + continue; + + if (!path_equal(ofnode_path, alias_path)) + continue; + + /* If there's no index, we default to 0... */ + if (isempty(alias_index)) { + i = 0; + conflict = "ethernet0"; + } else { + r = safe_atou(alias_index, &i); + if (r < 0) + return log_device_debug_errno(dev, r, + "Could not get index of alias %s: %m", alias); + conflict = "ethernet"; + } + + /* ...but make sure we don't have an alias conflict */ + if (i == 0 && sd_device_get_sysattr_value(aliases_dev, conflict, NULL) >= 0) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EEXIST), + "Ethernet alias conflict: ethernet and ethernet0 both exist"); + + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%sd%u", prefix, i)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str); + log_device_debug(dev, "devicetree identifier: alias_index=%u %s \"%s\"", + i, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix)); + return 0; + } + + return -ENOENT; +} + +static int names_pci(sd_device *dev, const char *prefix, bool test) { + _cleanup_(sd_device_unrefp) sd_device *physfn_pcidev = NULL; + _cleanup_free_ char *virtfn_suffix = NULL; + sd_device *parent; + + assert(dev); + assert(prefix); + + /* check if our direct parent is a PCI device with no other bus in-between */ + if (get_matching_parent(dev, STRV_MAKE("pci"), /* skip_virtio = */ true, &parent) < 0) + return 0; + + /* If this is an SR-IOV virtual device, get base name using physical device and add virtfn suffix. */ + if (naming_scheme_has(NAMING_SR_IOV_V) && + get_virtfn_info(parent, &physfn_pcidev, &virtfn_suffix) >= 0) + parent = physfn_pcidev; + else + (void) names_pci_onboard_label(dev, parent, prefix, test); + + (void) names_pci_onboard(dev, parent, prefix, virtfn_suffix, test); + (void) names_pci_slot(dev, parent, prefix, virtfn_suffix, test); + return 0; +} + +static int get_usb_specifier(sd_device *dev, char **ret) { + char *ports, *config, *interf, *s, *buf; + const char *sysname; + int r; + + assert(dev); + assert(ret); + + r = sd_device_get_sysname(dev, &sysname); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); + + /* get USB port number chain, configuration, interface */ + s = strchr(sysname, '-'); + if (!s) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "sysname \"%s\" does not have '-' in the expected place.", sysname); + + ports = strdupa_safe(s + 1); + s = strchr(ports, ':'); + if (!s) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "sysname \"%s\" does not have ':' in the expected place.", sysname); + + *s = '\0'; + config = s + 1; + s = strchr(config, '.'); + if (!s) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "sysname \"%s\" does not have '.' in the expected place.", sysname); + + *s = '\0'; + interf = s + 1; + + /* prefix every port number in the chain with "u" */ + string_replace_char(ports, '.', 'u'); + + /* suppress the common config == 1 */ + if (streq(config, "1")) + config = NULL; + + /* suppress the interface == 0 */ + if (streq(interf, "0")) + interf = NULL; + + buf = strjoin("u", ports, + config ? "c" : "", strempty(config), + interf ? "i" : "", strempty(interf)); + if (!buf) + return log_oom_debug(); + + log_device_debug(dev, "USB name identifier: ports=%s config=%s interface=%s %s %s", + ports, strna(config), strna(interf), + special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), buf); + + *ret = buf; + return 0; +} + +static int names_usb(sd_device *dev, const char *prefix, bool test) { + _cleanup_free_ char *suffix = NULL; + sd_device *usbdev, *pcidev; + int r; + + assert(dev); + assert(prefix); + + /* USB device */ + + r = sd_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface", &usbdev); + if (r < 0) + return log_device_debug_errno(dev, r, "Could not find usb parent device: %m"); + + r = get_usb_specifier(usbdev, &suffix); + if (r < 0) + return r; + + /* If the USB bus is on PCI bus, then suffix the USB specifier to the name based on the PCI bus. */ + r = sd_device_get_parent_with_subsystem_devtype(usbdev, "pci", NULL, &pcidev); + if (r >= 0) + return names_pci_slot(dev, pcidev, prefix, suffix, test); + + if (r != -ENOENT || !naming_scheme_has(NAMING_USB_HOST)) + return log_device_debug_errno(usbdev, r, "Failed to get parent PCI bus: %m"); + + /* Otherwise, e.g. on-chip asics that have USB ports, use the USB specifier as is. */ + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%s%s", prefix, suffix)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str); + + return 0; +} + +static int get_bcma_specifier(sd_device *dev, char **ret) { + const char *sysname; + char *buf = NULL; + unsigned core; + int r; + + assert(dev); + assert(ret); + + r = sd_device_get_sysname(dev, &sysname); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); + + /* bus num:core num */ + r = sscanf(sysname, "bcma%*u:%u", &core); + if (r != 1) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "Failed to parse bcma device information."); + + /* suppress the common core == 0 */ + if (core > 0 && asprintf(&buf, "b%u", core) < 0) + return log_oom_debug(); + + log_device_debug(dev, "BCMA core identifier: core=%u %s \"%s\"", + core, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), strna(buf)); + + *ret = buf; + return 0; +} + +static int names_bcma(sd_device *dev, const char *prefix, bool test) { + _cleanup_free_ char *suffix = NULL; + sd_device *bcmadev, *pcidev; + int r; + + assert(dev); + assert(prefix); + + r = sd_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL, &bcmadev); + if (r < 0) + return log_device_debug_errno(dev, r, "Could not get bcma parent device: %m"); + + r = sd_device_get_parent_with_subsystem_devtype(bcmadev, "pci", NULL, &pcidev); + if (r < 0) + return log_device_debug_errno(dev, r, "Could not get pci parent device: %m"); + + r = get_bcma_specifier(bcmadev, &suffix); + if (r < 0) + return r; + + return names_pci_slot(dev, pcidev, prefix, suffix, test); +} + +static int names_ccw(sd_device *dev, const char *prefix, bool test) { + sd_device *cdev; + const char *bus_id; + size_t bus_id_start, bus_id_len; + int r; + + assert(dev); + assert(prefix); + + /* get path names for Linux on System z network devices */ + + if (get_matching_parent(dev, STRV_MAKE("ccwgroup", "ccw"), /* skip_virtio = */ true, &cdev) < 0) + return 0; + + log_device_debug(dev, "Device is CCW."); + + /* 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 log_device_debug_errno(cdev, r, "Failed to get sysname: %m"); + + /* 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 log_device_debug_errno(cdev, SYNTHETIC_ERRNO(EINVAL), "Invalid bus_id: %s", bus_id); + + /* 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; + + /* Use the CCW bus-ID as network device name */ + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%sc%s", prefix, bus_id)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str); + log_device_debug(dev, "CCW identifier: ccw_busid=%s %s \"%s\"", + bus_id, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix)); + return 0; +} + +/* IEEE Organizationally Unique Identifier vendor string */ +static int ieee_oui(sd_device *dev, const struct hw_addr_data *hw_addr, bool test) { + char str[32]; + + assert(dev); + assert(hw_addr); + + if (hw_addr->length != 6) + return -EOPNOTSUPP; + + /* skip commonly misused 00:00:00 (Xerox) prefix */ + if (hw_addr->bytes[0] == 0 && + hw_addr->bytes[1] == 0 && + hw_addr->bytes[2] == 0) + return -EINVAL; + + xsprintf(str, "OUI:%02X%02X%02X%02X%02X%02X", + hw_addr->bytes[0], + hw_addr->bytes[1], + hw_addr->bytes[2], + hw_addr->bytes[3], + hw_addr->bytes[4], + hw_addr->bytes[5]); + + return udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test); +} + +static int names_mac(sd_device *dev, const char *prefix, bool test) { + unsigned iftype, assign_type; + struct hw_addr_data hw_addr; + const char *s; + int r; + + assert(dev); + assert(prefix); + + r = device_get_sysattr_unsigned(dev, "type", &iftype); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to read 'type' attribute: %m"); + + /* The persistent part of a hardware address of an InfiniBand NIC is 8 bytes long. We cannot + * fit this much in an iface name. + * TODO: but it can be used as alternative names?? */ + if (iftype == ARPHRD_INFINIBAND) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EOPNOTSUPP), + "Not generating MAC name for infiniband device."); + + /* check for NET_ADDR_PERM, skip random MAC addresses */ + r = device_get_sysattr_unsigned(dev, "addr_assign_type", &assign_type); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to read/parse addr_assign_type: %m"); + + if (assign_type != NET_ADDR_PERM) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "addr_assign_type=%u, MAC address is not permanent.", assign_type); + + r = sd_device_get_sysattr_value(dev, "address", &s); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to read 'address' attribute: %m"); + + r = parse_hw_addr(s, &hw_addr); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to parse 'address' attribute: %m"); + + if (hw_addr.length != 6) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EOPNOTSUPP), + "Not generating MAC name for device with MAC address of length %zu.", + hw_addr.length); + + char str[ALTIFNAMSIZ]; + xsprintf(str, "%sx%s", prefix, HW_ADDR_TO_STR_FULL(&hw_addr, HW_ADDR_TO_STRING_NO_COLON)); + udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str); + log_device_debug(dev, "MAC address identifier: hw_addr=%s %s %s", + HW_ADDR_TO_STR(&hw_addr), + special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix)); + + (void) ieee_oui(dev, &hw_addr, test); + return 0; +} + +static int names_netdevsim(sd_device *dev, const char *prefix, bool test) { + sd_device *netdevsimdev; + const char *sysnum, *phys_port_name; + unsigned addr; + int r; + + assert(dev); + assert(prefix); + + /* get netdevsim path names */ + + if (!naming_scheme_has(NAMING_NETDEVSIM)) + return 0; + + r = sd_device_get_parent_with_subsystem_devtype(dev, "netdevsim", NULL, &netdevsimdev); + if (r < 0) + return r; + + r = sd_device_get_sysnum(netdevsimdev, &sysnum); + if (r < 0) + return log_device_debug_errno(netdevsimdev, r, "Failed to get device sysnum: %m"); + + r = safe_atou(sysnum, &addr); + if (r < 0) + return log_device_debug_errno(netdevsimdev, r, "Failed to parse device sysnum: %m"); + + r = sd_device_get_sysattr_value(dev, "phys_port_name", &phys_port_name); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get 'phys_port_name' attribute: %m"); + if (isempty(phys_port_name)) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EOPNOTSUPP), + "The 'phys_port_name' attribute is empty."); + + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%si%un%s", prefix, addr, phys_port_name)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str); + log_device_debug(dev, "Netdevsim identifier: address=%u, port_name=%s %s %s", + addr, phys_port_name, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix)); + return 0; +} + +static int names_xen(sd_device *dev, const char *prefix, bool test) { + _cleanup_free_ char *vif = NULL; + const char *p; + unsigned id; + int r; + + assert(dev); + assert(prefix); + + /* get xen vif "slot" based names. */ + + if (!naming_scheme_has(NAMING_XEN_VIF)) + return 0; + + /* check if our direct parent is a Xen VIF device with no other bus in-between */ + if (get_matching_parent(dev, STRV_MAKE("xen"), /* skip_virtio = */ false, NULL) < 0) + return 0; + + /* Use the vif-n name to extract "n" */ + r = get_first_syspath_component(dev, "/sys/devices/", &vif); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get Xen VIF name: %m"); + + p = startswith(vif, "vif-"); + if (!p) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL), "Invalid vif name: %s: %m", vif); + + r = safe_atou_full(p, SAFE_ATO_REFUSE_PLUS_MINUS | SAFE_ATO_REFUSE_LEADING_ZERO | + SAFE_ATO_REFUSE_LEADING_WHITESPACE | 10, &id); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to parse vif index from '%s': %m", p); + + char str[ALTIFNAMSIZ]; + if (snprintf_ok(str, sizeof str, "%sX%u", prefix, id)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str); + log_device_debug(dev, "Xen identifier: id=%u %s %s", + id, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix)); + return 0; +} + +static int get_ifname_prefix(sd_device *dev, const char **ret) { + unsigned iftype; + int r; + + assert(dev); + assert(ret); + + r = device_get_sysattr_unsigned(dev, "type", &iftype); + if (r < 0) + return r; + + /* handle only ARPHRD_ETHER, ARPHRD_SLIP and ARPHRD_INFINIBAND devices */ + switch (iftype) { + case ARPHRD_ETHER: { + const char *s = NULL; + + r = sd_device_get_devtype(dev, &s); + if (r < 0 && r != -ENOENT) + return r; + + if (streq_ptr(s, "wlan")) + *ret = "wl"; + else if (streq_ptr(s, "wwan")) + *ret = "ww"; + else + *ret = "en"; + return 0; + } + case ARPHRD_INFINIBAND: + if (!naming_scheme_has(NAMING_INFINIBAND)) + return -EOPNOTSUPP; + + *ret = "ib"; + return 0; + + case ARPHRD_SLIP: + *ret = "sl"; + return 0; + + default: + return -EOPNOTSUPP; + } +} + +static int device_is_stacked(sd_device *dev) { + int ifindex, iflink, r; + + assert(dev); + + r = sd_device_get_ifindex(dev, &ifindex); + if (r < 0) + return r; + + r = device_get_sysattr_int(dev, "iflink", &iflink); + if (r < 0) + return r; + + return ifindex != iflink; +} + +static int builtin_net_id(UdevEvent *event, int argc, char *argv[], bool test) { + sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev); + const char *prefix; + int r; + + /* skip stacked devices, like VLANs, ... */ + r = device_is_stacked(dev); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to check if the device is stacked: %m"); + if (r > 0) + return 0; + + r = get_ifname_prefix(dev, &prefix); + if (r < 0) { + log_device_debug_errno(dev, r, "Failed to determine prefix for network interface naming, ignoring: %m"); + return 0; + } + + udev_builtin_add_property(dev, test, "ID_NET_NAMING_SCHEME", naming_scheme()->name); + + (void) names_mac(dev, prefix, test); + (void) names_devicetree(dev, prefix, test); + (void) names_ccw(dev, prefix, test); + (void) names_vio(dev, prefix, test); + (void) names_platform(dev, prefix, test); + (void) names_netdevsim(dev, prefix, test); + (void) names_xen(dev, prefix, test); + (void) names_pci(dev, prefix, test); + (void) names_usb(dev, prefix, test); + (void) names_bcma(dev, prefix, test); + + return 0; +} + +static int builtin_net_id_init(void) { + /* Load naming scheme here to suppress log messages in workers. */ + naming_scheme(); + return 0; +} + +const UdevBuiltin udev_builtin_net_id = { + .name = "net_id", + .cmd = builtin_net_id, + .init = builtin_net_id_init, + .help = "Network device properties", +}; |