1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 #include "alloc-util.h"
4 #include "netif-naming-scheme.h"
5 #include "proc-cmdline.h"
6 #include "string-util.h"
8 #ifdef _DEFAULT_NET_NAMING_SCHEME_TEST
9 /* The primary purpose of this check is to verify that _DEFAULT_NET_NAMING_SCHEME_TEST
10 * is a valid identifier. If an invalid name is given during configuration, this will
11 * fail with a name error. */
12 assert_cc(_DEFAULT_NET_NAMING_SCHEME_TEST
>= 0);
15 static const NamingScheme naming_schemes
[] = {
16 { "v238", NAMING_V238
},
17 { "v239", NAMING_V239
},
18 { "v240", NAMING_V240
},
19 { "v241", NAMING_V241
},
20 { "v243", NAMING_V243
},
21 { "v245", NAMING_V245
},
22 { "v247", NAMING_V247
},
23 { "v249", NAMING_V249
},
24 { "v250", NAMING_V250
},
25 /* … add more schemes here, as the logic to name devices is updated … */
30 const NamingScheme
* naming_scheme_from_name(const char *name
) {
31 /* "latest" may either be defined explicitly by the extra map, in which case we we will find it in
32 * the table like any other name. After iterating through the table, we check for "latest" again,
33 * which means that if not mapped explicitly, it maps to the last defined entry, whatever that is. */
35 for (size_t i
= 0; i
< ELEMENTSOF(naming_schemes
); i
++)
36 if (streq(naming_schemes
[i
].name
, name
))
37 return naming_schemes
+ i
;
39 if (streq(name
, "latest"))
40 return naming_schemes
+ ELEMENTSOF(naming_schemes
) - 1;
45 const NamingScheme
* naming_scheme(void) {
46 static const NamingScheme
*cache
= NULL
;
47 _cleanup_free_
char *buffer
= NULL
;
53 /* Acquire setting from the kernel command line */
54 (void) proc_cmdline_get_key("net.naming-scheme", 0, &buffer
);
56 /* Also acquire it from an env var */
57 e
= getenv("NET_NAMING_SCHEME");
60 /* If prefixed with ':' the kernel cmdline takes precedence */
63 k
= e
; /* Otherwise the env var takes precedence */
68 cache
= naming_scheme_from_name(k
);
70 log_info("Using interface naming scheme '%s'.", cache
->name
);
74 log_warning("Unknown interface naming scheme '%s' requested, ignoring.", k
);
77 cache
= naming_scheme_from_name(DEFAULT_NET_NAMING_SCHEME
);
79 log_info("Using default interface naming scheme '%s'.", cache
->name
);