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-rw-r--r--src/udev/net/naming-scheme.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/src/udev/net/naming-scheme.c b/src/udev/net/naming-scheme.c
new file mode 100644
index 0000000..27cede5
--- /dev/null
+++ b/src/udev/net/naming-scheme.c
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#include "alloc-util.h"
+#include "naming-scheme.h"
+#include "proc-cmdline.h"
+#include "string-util.h"
+
+static const NamingScheme naming_schemes[] = {
+ { "v238", NAMING_V238 },
+ { "v239", NAMING_V239 },
+ { "v240", NAMING_V240 },
+ /* … add more schemes here, as the logic to name devices is updated … */
+};
+
+static const NamingScheme* naming_scheme_from_name(const char *name) {
+ size_t i;
+
+ if (streq(name, "latest"))
+ return naming_schemes + ELEMENTSOF(naming_schemes) - 1;
+
+ for (i = 0; i < ELEMENTSOF(naming_schemes); i++)
+ if (streq(naming_schemes[i].name, name))
+ return naming_schemes + i;
+
+ 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;
+}