X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fudev%2Fudev-builtin-net_id.c;h=c80c30ac77328c0fedfd8d653415e17d3b677148;hb=86e6e5d1b4e78d62d1a45539c1de141bc5e839aa;hp=ebada80e1bd205ceff1d3233aa14c9aa4adebf6a;hpb=f610d6de38119b372b377ec41b2a6089872d3294;p=elogind.git diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c index ebada80e1..c80c30ac7 100644 --- a/src/udev/udev-builtin-net_id.c +++ b/src/udev/udev-builtin-net_id.c @@ -18,43 +18,58 @@ ***/ /* - * predictable network interface device names based on: + * Predictable network interface device names based on: * - firmware/bios-provided index numbers for on-board devices * - firmware-provided pci-express hotplug slot index number * - physical/geographical location of the hardware * - the interface's MAC address * - * two character prefixes based on the type of interface: + * http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames + * + * Two character prefixes based on the type of interface: * en -- ethernet + * sl -- serial line IP (slip) * wl -- wlan * ww -- wwan * - * type of names: - * o -- on-board device index number - * s[f] -- hotplug slot index number - * x -- MAC address - * ps[f] -- PCI geographical location - * ps[f][u][u][c][i] - * -- USB port number chain + * Type of names: + * b -- BCMA bus core number + * ccw -- CCW bus group name + * o -- on-board device index number + * s[f][d] -- hotplug slot index number + * x -- MAC address + * [P]ps[f][d] + * -- PCI geographical location + * [P]ps[f][u][..][c][i] + * -- USB port number chain * - * All multi-function devices will carry the [f] number in the + * All multi-function PCI devices will carry the [f] number in the * device name, including the function 0 device. * - * PCI card with firmware index + * When using PCI geography, The PCI domain is only prepended when it is not 0. + * + * For USB devices the full chain of port numbers of hubs is composed. If the + * name gets longer than the maximum number of 15 characters, the name is not + * exported. + * The usual USB configuration == 1 and interface == 0 values are suppressed. + * + * PCI ethernet card with firmware index "1": * ID_NET_NAME_ONBOARD=eno1 * ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1 * - * PCI card + * PCI ethernet card in hotplug slot with firmware index number: * /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1 * ID_NET_NAME_MAC=enx000000000466 * ID_NET_NAME_PATH=enp5s0 * ID_NET_NAME_SLOT=ens1 * - * PCI card in hotplug slot with firmware index number: - * /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1 - * ID_NET_NAME_MAC=enx000000000466 - * ID_NET_NAME_PATH=enp5s0 - * ID_NET_NAME_SLOT=ens1 + * PCI ethernet multi-function card with 2 ports: + * /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/enp2s0f0 + * ID_NET_NAME_MAC=enx78e7d1ea46da + * ID_NET_NAME_PATH=enp2s0f0 + * /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.1/net/enp2s0f1 + * ID_NET_NAME_MAC=enx78e7d1ea46dc + * ID_NET_NAME_PATH=enp2s0f1 * * PCI wlan card: * /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlp3s0 @@ -79,14 +94,19 @@ #include #include #include +#include #include #include "udev.h" +#include "fileio.h" enum netname_type{ NET_UNDEF, NET_PCI, NET_USB, + NET_BCMA, + NET_VIRTIO, + NET_CCWGROUP, }; struct netnames { @@ -101,8 +121,9 @@ struct netnames { char pci_onboard[IFNAMSIZ]; const char *pci_onboard_label; - struct udev_device *usbdev; char usb_ports[IFNAMSIZ]; + char bcma_core[IFNAMSIZ]; + char ccw_group[IFNAMSIZ]; }; /* retrieve on-board index number and label from firmware */ @@ -127,11 +148,11 @@ static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) { } /* read the 256 bytes PCI configuration space to check the multi-function bit */ -static bool is_pci_singlefunction(struct udev_device *dev) { +static bool is_pci_multifunction(struct udev_device *dev) { char filename[256]; - FILE *f; + FILE *f = NULL; char config[64]; - bool single = false; + bool multi = false; snprintf(filename, sizeof(filename), "%s/config", udev_device_get_syspath(dev)); f = fopen(filename, "re"); @@ -141,33 +162,46 @@ static bool is_pci_singlefunction(struct udev_device *dev) { goto out; /* bit 0-6 header type, bit 7 multi/single function device */ - if ((config[PCI_HEADER_TYPE] & 0x80) == 0) - single = true; + if ((config[PCI_HEADER_TYPE] & 0x80) != 0) + multi = true; out: - fclose(f); - return single; + if (f) + fclose(f); + return multi; } static int dev_pci_slot(struct udev_device *dev, struct netnames *names) { struct udev *udev = udev_device_get_udev(names->pcidev); - unsigned int bus; - unsigned int slot; - unsigned int func; + unsigned domain, bus, slot, func, dev_id = 0; + size_t l; + char *s; + const char *attr; struct udev_device *pci = NULL; - char slots[256]; - DIR *dir; + char slots[256], str[256]; + _cleanup_closedir_ DIR *dir = NULL; struct dirent *dent; - char str[256]; - int hotplug_slot = 0; - int err = 0; + int hotplug_slot = 0, err = 0; - /* compose a name based on the raw kernel's PCI bus, slot numbers */ - if (sscanf(udev_device_get_sysname(names->pcidev), "0000:%x:%x.%d", &bus, &slot, &func) != 3) + if (sscanf(udev_device_get_sysname(names->pcidev), "%x:%x:%x.%u", &domain, &bus, &slot, &func) != 4) return -ENOENT; - if (func == 0 && is_pci_singlefunction(names->pcidev)) - snprintf(names->pci_path, sizeof(names->pci_path), "p%ds%d", bus, slot); - else - snprintf(names->pci_path, sizeof(names->pci_path), "p%ds%df%d", bus, slot, func); + + /* kernel provided multi-device index */ + attr = udev_device_get_sysattr_value(dev, "dev_id"); + if (attr) + dev_id = strtol(attr, NULL, 16); + + /* compose a name based on the raw kernel's PCI bus, slot numbers */ + s = names->pci_path; + l = sizeof(names->pci_path); + if (domain > 0) + l = strpcpyf(&s, l, "P%d", domain); + l = strpcpyf(&s, l, "p%ds%d", bus, slot); + if (func > 0 || is_pci_multifunction(names->pcidev)) + l = strpcpyf(&s, l, "f%d", func); + if (dev_id > 0) + l = strpcpyf(&s, l, "d%d", dev_id); + if (l == 0) + names->pci_path[0] = '\0'; /* ACPI _SUN -- slot user number */ pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci"); @@ -197,7 +231,7 @@ static int dev_pci_slot(struct udev_device *dev, struct netnames *names) { snprintf(str, sizeof(str), "%s/%s/address", slots, dent->d_name); if (read_one_line_file(str, &address) >= 0) { /* match slot address with device by stripping the function */ - if (strncmp(address, udev_device_get_sysname(names->pcidev), strlen(address)) == 0) + if (strneq(address, udev_device_get_sysname(names->pcidev), strlen(address))) hotplug_slot = i; free(address); } @@ -205,13 +239,19 @@ static int dev_pci_slot(struct udev_device *dev, struct netnames *names) { if (hotplug_slot > 0) break; } - closedir(dir); if (hotplug_slot > 0) { - if (func == 0 && is_pci_singlefunction(names->pcidev)) - snprintf(names->pci_slot, sizeof(names->pci_slot), "s%d", hotplug_slot); - else - snprintf(names->pci_slot, sizeof(names->pci_slot), "s%df%d", hotplug_slot, func); + s = names->pci_slot; + l = sizeof(names->pci_slot); + if (domain > 0) + l = strpcpyf(&s, l, "P%d", domain); + l = strpcpyf(&s, l, "s%d", hotplug_slot); + if (func > 0 || is_pci_multifunction(names->pcidev)) + l = strpcpyf(&s, l, "f%d", func); + if (dev_id > 0) + l = strpcpyf(&s, l, "d%d", dev_id); + if (l == 0) + names->pci_path[0] = '\0'; } out: udev_device_unref(pci); @@ -225,7 +265,7 @@ static int names_pci(struct udev_device *dev, struct netnames *names) { if (!parent) return -ENOENT; /* check if our direct parent is a PCI device with no other bus in-between */ - if (streq("pci", udev_device_get_subsystem(parent))) { + if (streq_ptr("pci", udev_device_get_subsystem(parent))) { names->type = NET_PCI; names->pcidev = parent; } else { @@ -239,6 +279,7 @@ static int names_pci(struct udev_device *dev, struct netnames *names) { } static int names_usb(struct udev_device *dev, struct netnames *names) { + struct udev_device *usbdev; char name[256]; char *ports; char *config; @@ -246,12 +287,12 @@ static int names_usb(struct udev_device *dev, struct netnames *names) { size_t l; char *s; - names->usbdev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface"); - if (!names->usbdev) + usbdev = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface"); + if (!usbdev) return -ENOENT; /* get USB port number chain, configuration, interface */ - util_strscpy(name, sizeof(name), udev_device_get_sysname(names->usbdev)); + strscpy(name, sizeof(name), udev_device_get_sysname(usbdev)); s = strchr(name, '-'); if (!s) return -EINVAL; @@ -274,15 +315,15 @@ static int names_usb(struct udev_device *dev, struct netnames *names) { while ((s = strchr(s, '.'))) s[0] = 'u'; s = names->usb_ports; - l = util_strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL); + l = strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL); /* append USB config number, suppress the common config == 1 */ if (!streq(config, "1")) - l = util_strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL); + l = strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL); /* append USB interface number, suppress the interface == 0 */ if (!streq(interf, "0")) - l = util_strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL); + l = strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL); if (l == 0) return -ENAMETOOLONG; @@ -290,6 +331,63 @@ static int names_usb(struct udev_device *dev, struct netnames *names) { return 0; } +static int names_bcma(struct udev_device *dev, struct netnames *names) { + struct udev_device *bcmadev; + unsigned int core; + + bcmadev = udev_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL); + if (!bcmadev) + return -ENOENT; + + /* bus num:core num */ + if (sscanf(udev_device_get_sysname(bcmadev), "bcma%*u:%u", &core) != 1) + return -EINVAL; + /* suppress the common core == 0 */ + if (core > 0) + snprintf(names->bcma_core, sizeof(names->bcma_core), "b%u", core); + + names->type = NET_BCMA; + return 0; +} + +static int names_ccw(struct udev_device *dev, struct netnames *names) { + struct udev_device *cdev; + const char *bus_id; + size_t bus_id_len; + int rc; + + /* Retrieve the associated CCW device */ + cdev = udev_device_get_parent(dev); + if (!cdev) + return -ENOENT; + + /* Network devices are always grouped CCW devices */ + if (!streq_ptr("ccwgroup", udev_device_get_subsystem(cdev))) + return -ENOENT; + + /* Retrieve bus-ID of the grouped CCW device. The bus-ID uniquely + * identifies the network device on the Linux on System z channel + * subsystem. Note that the bus-ID contains lowercase characters. + */ + bus_id = udev_device_get_sysname(cdev); + if (!bus_id) + return -ENOENT; + + /* Check the length of the bus-ID. Rely on that the kernel provides + * a correct bus-ID; alternatively, improve this check and parse and + * verify each bus-ID part... + */ + bus_id_len = strlen(bus_id); + if (!bus_id_len || bus_id_len < 8 || bus_id_len > 9) + return -EINVAL; + + /* Store the CCW bus-ID for use as network device name */ + rc = snprintf(names->ccw_group, sizeof(names->ccw_group), "ccw%s", bus_id); + if (rc >= 0 && rc < (int)sizeof(names->ccw_group)) + names->type = NET_CCWGROUP; + return 0; +} + static int names_mac(struct udev_device *dev, struct netnames *names) { const char *s; unsigned int i; @@ -325,9 +423,9 @@ static int names_mac(struct udev_device *dev, struct netnames *names) { /* IEEE Organizationally Unique Identifier vendor string */ static int ieee_oui(struct udev_device *dev, struct netnames *names, bool test) { - char str[IFNAMSIZ]; + char str[32]; - if (names->mac_valid) + if (!names->mac_valid) return -ENOENT; /* skip commonly misused 00:00:00 (Xerox) prefix */ if (memcmp(names->mac, "\0\0\0", 3) == 0) @@ -335,24 +433,43 @@ static int ieee_oui(struct udev_device *dev, struct netnames *names, bool test) snprintf(str, sizeof(str), "OUI:%02X%02X%02X%02X%02X%02X", names->mac[0], names->mac[1], names->mac[2], names->mac[3], names->mac[4], names->mac[5]); - udev_builtin_hwdb_lookup(dev, str, test); + udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test); return 0; } static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) { const char *s; + const char *p; unsigned int i; const char *devtype; const char *prefix = "en"; - struct netnames names; + struct netnames names = {}; int err; - /* handle only ARPHRD_ETHER devices */ + /* handle only ARPHRD_ETHER and ARPHRD_SLIP devices */ s = udev_device_get_sysattr_value(dev, "type"); if (!s) return EXIT_FAILURE; i = strtoul(s, NULL, 0); - if (i != 1) + switch (i) { + case ARPHRD_ETHER: + prefix = "en"; + break; + case ARPHRD_SLIP: + prefix = "sl"; + break; + default: + return 0; + } + + /* skip stacked devices, like VLANs, ... */ + s = udev_device_get_sysattr_value(dev, "ifindex"); + if (!s) + return EXIT_FAILURE; + p = udev_device_get_sysattr_value(dev, "iflink"); + if (!p) + return EXIT_FAILURE; + if (!streq(s, p)) return 0; devtype = udev_device_get_devtype(dev); @@ -363,7 +480,6 @@ static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool prefix = "ww"; } - zero(names); err = names_mac(dev, &names); if (err >= 0 && names.mac_valid) { char str[IFNAMSIZ]; @@ -376,6 +492,16 @@ static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool ieee_oui(dev, &names, test); } + /* get path names for Linux on System z network devices */ + err = names_ccw(dev, &names); + if (err >= 0 && names.type == NET_CCWGROUP) { + char str[IFNAMSIZ]; + + if (snprintf(str, sizeof(str), "%s%s", prefix, names.ccw_group) < (int)sizeof(str)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str); + goto out; + } + /* get PCI based path names, we compose only PCI based paths */ err = names_pci(dev, &names); if (err < 0) @@ -415,6 +541,22 @@ static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool if (names.pci_slot[0]) if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.usb_ports) < (int)sizeof(str)) udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str); + goto out; + } + + /* Broadcom bus */ + err = names_bcma(dev, &names); + if (err >= 0 && names.type == NET_BCMA) { + char str[IFNAMSIZ]; + + if (names.pci_path[0]) + if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_path, names.bcma_core) < (int)sizeof(str)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str); + + if (names.pci_slot[0]) + if (snprintf(str, sizeof(str), "%s%s%s", prefix, names.pci_slot, names.bcma_core) < (int)sizeof(str)) + udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str); + goto out; } out: return EXIT_SUCCESS;