/* 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 #include #include #include #include #include #include #include #include "alloc-util.h" #include "device-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_14BIT_INDEX_MAX ((1U << 14) - 1) #define ONBOARD_16BIT_INDEX_MAX ((1U << 16) - 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) { /* 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_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; } static bool is_valid_onboard_index(unsigned long 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); } /* 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; if (!is_valid_onboard_index(idx)) 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) { r = safe_atolu_full(attr, 10, &dev_port); if (r < 0) log_device_debug_errno(dev, r, "Failed to parse dev_port, ignoring: %m"); } /* 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 parse_hotplug_slot_from_function_id(sd_device *dev, const char *slots, uint32_t *ret) { uint64_t function_id; char path[PATH_MAX]; const char *attr; int r; /* The /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/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. */ assert(dev); assert(slots); assert(ret); if (!naming_scheme_has(NAMING_SLOT_FUNCTION_ID)) return 0; if (sd_device_get_sysattr_value(dev, "function_id", &attr) < 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(path, sizeof path, "%s/%08"PRIx64, slots, function_id)) return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENAMETOOLONG), "PCI slot path is too long, ignoring."); if (access(path, F_OK) < 0) return log_device_debug_errno(dev, errno, "Cannot access %s, ignoring: %m", path); *ret = (uint32_t) function_id; return 1; } static int dev_pci_slot(sd_device *dev, struct netnames *names) { const char *sysname, *attr, *port_name = NULL, *syspath; _cleanup_(sd_device_unrefp) sd_device *pci = NULL; _cleanup_closedir_ DIR *dir = NULL; unsigned domain, bus, slot, func; sd_device *hotplug_slot_dev; unsigned long dev_port = 0; uint32_t hotplug_slot = 0; char slots[PATH_MAX], *s; size_t l; 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) { r = safe_atolu_full(attr, 10, &dev_port); if (r < 0) log_device_debug_errno(dev, r, "Failed to parse attribute dev_port, ignoring: %m"); /* 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; r = safe_atolu_full(attr, 10, &type); if (r < 0) log_device_debug_errno(dev, r, "Failed to parse attribute type, ignoring: %m"); else if (type == ARPHRD_INFINIBAND && sd_device_get_sysattr_value(dev, "dev_id", &attr) >= 0) { r = safe_atolu_full(attr, 10, &dev_port); if (r < 0) log_device_debug_errno(dev, r, "Failed to parse attribute dev_id, ignoring: %m"); } } } /* 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) { struct dirent *dent; r = parse_hotplug_slot_from_function_id(hotplug_slot_dev, slots, &hotplug_slot); if (r < 0) return 0; if (r > 0) { domain = 0; /* See comments in parse_hotplug_slot_from_function_id(). */ break; } r = sd_device_get_sysname(hotplug_slot_dev, &sysname); if (r < 0) return log_device_debug_errno(hotplug_slot_dev, r, "Failed to get sysname: %m"); FOREACH_DIRENT_ALL(dent, dir, break) { _cleanup_free_ char *address = NULL; char str[PATH_MAX]; uint32_t i; if (dot_or_dot_dot(dent->d_name)) continue; r = safe_atou32(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)) return 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%"PRIu32, 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, ðid) != 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 hexadecimal model number : instance id. */ DISABLE_WARNING_FORMAT_NONLITERAL; if (sscanf(syspath, pattern, vendor, &model, &instance, ðid) != 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; r = safe_atolu_full(s, 10, &i); if (r < 0) return r; 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; r = safe_atolu(s, &i); if (r < 0) return r; 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; r = safe_atolu_full(s, 10, &i); if (r < 0) return r; 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_ok(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", };