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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
commit55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch)
tree33f869f55a1b149e9b7c2b7e201867ca5dd52992 /src/shared/netif-naming-scheme.c
parentInitial commit. (diff)
downloadsystemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.tar.xz
systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.zip
Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/shared/netif-naming-scheme.c')
-rw-r--r--src/shared/netif-naming-scheme.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/src/shared/netif-naming-scheme.c b/src/shared/netif-naming-scheme.c
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+++ b/src/shared/netif-naming-scheme.c
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.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 },
+ /* … 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. */
+
+ for (size_t i = 0; i < ELEMENTSOF(naming_schemes); i++)
+ if (streq(naming_schemes[i].name, name))
+ return naming_schemes + i;
+
+ 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);