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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "sd-device.h"
#include "alloc-util.h"
#include "device-private.h"
#include "netif-naming-scheme.h"
#include "proc-cmdline.h"
#include "string-util.h"
#include "string-table.h"
static const NamingScheme naming_schemes[] = {
{ "v238", NAMING_V238 },
{ "v239", NAMING_V239 },
{ "v240", NAMING_V240 },
{ "v241", NAMING_V241 },
{ "v243", NAMING_V243 },
{ "v245", NAMING_V245 },
{ "v247", NAMING_V247 },
{ "v249", NAMING_V249 },
{ "v250", NAMING_V250 },
{ "v251", NAMING_V251 },
{ "v252", NAMING_V252 },
{ "v253", NAMING_V253 },
{ "v254", NAMING_V254 },
{ "v255", NAMING_V255 },
{ "v257", NAMING_V257 },
/* … add more schemes here, as the logic to name devices is updated … */
EXTRA_NET_NAMING_MAP
};
const NamingScheme* naming_scheme_from_name(const char *name) {
/* "latest" may either be defined explicitly by the extra map, in which case we will find it in
* the table like any other name. After iterating through the table, we check for "latest" again,
* which means that if not mapped explicitly, it maps to the last defined entry, whatever that is. */
FOREACH_ELEMENT(scheme, naming_schemes)
if (streq(scheme->name, name))
return scheme;
if (streq(name, "latest"))
return naming_schemes + ELEMENTSOF(naming_schemes) - 1;
return NULL;
}
const NamingScheme* naming_scheme(void) {
static const NamingScheme *cache = NULL;
_cleanup_free_ char *buffer = NULL;
const char *e, *k;
if (cache)
return cache;
/* Acquire setting from the kernel command line */
(void) proc_cmdline_get_key("net.naming_scheme", 0, &buffer);
/* Also acquire it from an env var */
e = getenv("NET_NAMING_SCHEME");
if (e) {
if (*e == ':') {
/* If prefixed with ':' the kernel cmdline takes precedence */
k = buffer ?: e + 1;
} else
k = e; /* Otherwise the env var takes precedence */
} else
k = buffer;
if (k) {
cache = naming_scheme_from_name(k);
if (cache) {
log_info("Using interface naming scheme '%s'.", cache->name);
return cache;
}
log_warning("Unknown interface naming scheme '%s' requested, ignoring.", k);
}
cache = naming_scheme_from_name(DEFAULT_NET_NAMING_SCHEME);
assert(cache);
log_info("Using default interface naming scheme '%s'.", cache->name);
return cache;
}
static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
[NAMEPOLICY_KERNEL] = "kernel",
[NAMEPOLICY_KEEP] = "keep",
[NAMEPOLICY_DATABASE] = "database",
[NAMEPOLICY_ONBOARD] = "onboard",
[NAMEPOLICY_SLOT] = "slot",
[NAMEPOLICY_PATH] = "path",
[NAMEPOLICY_MAC] = "mac",
};
DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
static const char* const alternative_names_policy_table[_NAMEPOLICY_MAX] = {
[NAMEPOLICY_DATABASE] = "database",
[NAMEPOLICY_ONBOARD] = "onboard",
[NAMEPOLICY_SLOT] = "slot",
[NAMEPOLICY_PATH] = "path",
[NAMEPOLICY_MAC] = "mac",
};
DEFINE_STRING_TABLE_LOOKUP(alternative_names_policy, NamePolicy);
static int naming_sysattr_allowed_by_default(sd_device *dev) {
int r;
assert(dev);
r = device_get_property_bool(dev, "ID_NET_NAME_ALLOW");
if (r == -ENOENT)
return true;
return r;
}
static int naming_sysattr_allowed(sd_device *dev, const char *sysattr) {
char *sysattr_property;
int r;
assert(dev);
assert(sysattr);
sysattr_property = strjoina("ID_NET_NAME_ALLOW_", sysattr);
ascii_strupper(sysattr_property);
r = device_get_property_bool(dev, sysattr_property);
if (r == -ENOENT)
/* If ID_NET_NAME_ALLOW is not set or set to 1 default is to allow */
return naming_sysattr_allowed_by_default(dev);
return r;
}
int device_get_sysattr_int_filtered(sd_device *device, const char *sysattr, int *ret_value) {
int r;
r = naming_sysattr_allowed(device, sysattr);
if (r < 0)
return r;
if (r == 0)
return -ENOENT;
return device_get_sysattr_int(device, sysattr, ret_value);
}
int device_get_sysattr_unsigned_filtered(sd_device *device, const char *sysattr, unsigned *ret_value) {
int r;
r = naming_sysattr_allowed(device, sysattr);
if (r < 0)
return r;
if (r == 0)
return -ENOENT;
return device_get_sysattr_unsigned(device, sysattr, ret_value);
}
int device_get_sysattr_bool_filtered(sd_device *device, const char *sysattr) {
int r;
r = naming_sysattr_allowed(device, sysattr);
if (r < 0)
return r;
if (r == 0)
return -ENOENT;
return device_get_sysattr_bool(device, sysattr);
}
int device_get_sysattr_value_filtered(sd_device *device, const char *sysattr, const char **ret_value) {
int r;
r = naming_sysattr_allowed(device, sysattr);
if (r < 0)
return r;
if (r == 0)
return -ENOENT;
return sd_device_get_sysattr_value(device, sysattr, ret_value);
}
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