From 4f47e35ee4026f24ee99a0bfa7ba5b2f24a92a02 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 16 Dec 2019 23:44:42 +0900
Subject: [PATCH] udev: introduce AlternativeNamesPolicy= setting
(cherry picked from commit ef1d2c07f9567dfea8a4e012d8779a4ded2d9ae6)
Resolves: #1850986
---
man/systemd.link.xml | 11 +++++
src/udev/net/link-config-gperf.gperf | 1 +
src/udev/net/link-config.c | 62 ++++++++++++++++++++++++++--
src/udev/net/link-config.h | 5 +++
4 files changed, 76 insertions(+), 3 deletions(-)
diff --git a/man/systemd.link.xml b/man/systemd.link.xml
index c8ebb751ee..13dcce0879 100644
--- a/man/systemd.link.xml
+++ b/man/systemd.link.xml
@@ -343,6 +343,17 @@
</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>AlternativeNamesPolicy=</varname></term>
+ <listitem>
+ <para>A space-separated list of policies by which the interface's alternative names
+ should be set. Each of the policies may fail, and all successful policies are used. The
+ available policies are <literal>database</literal>, <literal>onboard</literal>,
+ <literal>slot</literal>, <literal>path</literal>, and <literal>mac</literal>. If the
+ kernel does not support the alternative names, then this setting will be ignored.
+ </para>
+ </listitem>
+ </varlistentry>
<varlistentry>
<term><varname>AlternativeName=</varname></term>
<listitem>
diff --git a/src/udev/net/link-config-gperf.gperf b/src/udev/net/link-config-gperf.gperf
index 913c754145..df8404e7b8 100644
--- a/src/udev/net/link-config-gperf.gperf
+++ b/src/udev/net/link-config-gperf.gperf
@@ -35,6 +35,7 @@ Link.MACAddress, config_parse_hwaddr, 0,
Link.NamePolicy, config_parse_name_policy, 0, offsetof(link_config, name_policy)
Link.Name, config_parse_ifname, 0, offsetof(link_config, name)
Link.AlternativeName, config_parse_ifnames, 1, offsetof(link_config, alternative_names)
+Link.AlternativeNamesPolicy, config_parse_alternative_names_policy, 0, offsetof(link_config, alternative_names_policy)
Link.Alias, config_parse_ifalias, 0, offsetof(link_config, alias)
Link.MTUBytes, config_parse_mtu, AF_UNSPEC, offsetof(link_config, mtu)
Link.BitsPerSecond, config_parse_si_size, 0, offsetof(link_config, speed)
diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c
index 8e88c8e5c4..6ceb4c698e 100644
--- a/src/udev/net/link-config.c
+++ b/src/udev/net/link-config.c
@@ -69,6 +69,7 @@ static void link_config_free(link_config *link) {
free(link->name_policy);
free(link->name);
strv_free(link->alternative_names);
+ free(link->alternative_names_policy);
free(link->alias);
free(link);
@@ -349,6 +350,7 @@ static int get_mac(struct udev_device *device, bool want_random,
int link_config_apply(link_config_ctx *ctx, link_config *config,
struct udev_device *device, const char **name) {
+ _cleanup_strv_free_ char **altnames = NULL;
bool respect_predictable = false;
struct ether_addr generated_mac;
struct ether_addr *mac = NULL;
@@ -473,11 +475,52 @@ int link_config_apply(link_config_ctx *ctx, link_config *config,
if (r < 0)
return log_warning_errno(r, "Could not set Alias=, MACAddress= or MTU= on %s: %m", old_name);
- r = rtnl_set_link_alternative_names(&ctx->rtnl, ifindex, config->alternative_names);
+ if (config->alternative_names) {
+ altnames = strv_copy(config->alternative_names);
+ if (!altnames)
+ return log_oom();
+ }
+
+ if (config->alternative_names_policy)
+ for (NamePolicy *p = config->alternative_names_policy; *p != _NAMEPOLICY_INVALID; p++) {
+ const char *n;
+
+ switch (*p) {
+ case NAMEPOLICY_DATABASE:
+ n = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
+ break;
+ case NAMEPOLICY_ONBOARD:
+ n = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
+ break;
+ case NAMEPOLICY_SLOT:
+ n = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
+ break;
+ case NAMEPOLICY_PATH:
+ n = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
+ break;
+ case NAMEPOLICY_MAC:
+ n = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
+ break;
+ default:
+ assert_not_reached("invalid policy");
+ }
+ if (!isempty(n)) {
+ r = strv_extend(&altnames, n);
+ if (r < 0)
+ return log_oom();
+ }
+ }
+
+ if (new_name)
+ strv_remove(altnames, new_name);
+ strv_remove(altnames, old_name);
+ strv_uniq(altnames);
+
+ r = rtnl_set_link_alternative_names(&ctx->rtnl, ifindex, altnames);
if (r == -EOPNOTSUPP)
- log_debug_errno(r, "Could not set AlternativeName= on %s, ignoring: %m", old_name);
+ log_debug_errno(r, "Could not set AlternativeName= or apply AlternativeNamesPolicy= on %s, ignoring: %m", old_name);
else if (r < 0)
- return log_warning_errno(r, "Could not set AlternativeName= on %s: %m", old_name);
+ return log_warning_errno(r, "Could not set AlternativeName= or apply AlternativeNamesPolicy= on %s: %m", old_name);
*name = new_name;
@@ -524,3 +567,16 @@ DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
_NAMEPOLICY_INVALID,
"Failed to parse interface name policy");
+
+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);
+DEFINE_CONFIG_PARSE_ENUMV(config_parse_alternative_names_policy, alternative_names_policy, NamePolicy,
+ _NAMEPOLICY_INVALID,
+ "Failed to parse alternative names policy");
diff --git a/src/udev/net/link-config.h b/src/udev/net/link-config.h
index 93d5fdce59..634bd2ec54 100644
--- a/src/udev/net/link-config.h
+++ b/src/udev/net/link-config.h
@@ -49,6 +49,7 @@ struct link_config {
struct ether_addr *mac;
MACPolicy mac_policy;
NamePolicy *name_policy;
+ NamePolicy *alternative_names_policy;
char *name;
char **alternative_names;
char *alias;
@@ -78,6 +79,9 @@ int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret
const char *name_policy_to_string(NamePolicy p) _const_;
NamePolicy name_policy_from_string(const char *p) _pure_;
+const char *alternative_names_policy_to_string(NamePolicy p) _const_;
+NamePolicy alternative_names_policy_from_string(const char *p) _pure_;
+
const char *mac_policy_to_string(MACPolicy p) _const_;
MACPolicy mac_policy_from_string(const char *p) _pure_;
@@ -86,3 +90,4 @@ const struct ConfigPerfItem* link_config_gperf_lookup(const char *key, GPERF_LEN
int config_parse_mac_policy(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_name_policy(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_alternative_names_policy(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);