From c76d050d8d61b4a63d4407bd03bd3f49cd9915ce Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sun, 15 Dec 2019 22:46:19 +0900
Subject: [PATCH] network: make Name= in [Match] support alternative names of
 interfaces

(cherry picked from commit 572b21d96cabd5860b0670e98440b6cb99a4b749
src/network bits have been left out.)

Related: #1850986
---
 man/systemd.network.xml                   |  7 +++----
 src/libsystemd-network/network-internal.c | 20 ++++++++++++++++++--
 src/libsystemd-network/network-internal.h |  3 ++-
 src/udev/net/link-config.c                |  3 ++-
 4 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index fc8e0aea68..8300540096 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -133,10 +133,9 @@
         <varlistentry>
           <term><varname>Name=</varname></term>
           <listitem>
-            <para>A whitespace-separated list of shell-style globs
-            matching the device name, as exposed by the udev property
-            <literal>INTERFACE</literal>. If the list is prefixed
-            with a "!", the test is inverted.</para>
+            <para>A whitespace-separated list of shell-style globs matching the device name, as exposed
+            by the udev property <literal>INTERFACE</literal>, or device's alternative names. If the
+            list is prefixed with a "!", the test is inverted.</para>
           </listitem>
         </varlistentry>
         <varlistentry>
diff --git a/src/libsystemd-network/network-internal.c b/src/libsystemd-network/network-internal.c
index 629e858def..a935709cd0 100644
--- a/src/libsystemd-network/network-internal.c
+++ b/src/libsystemd-network/network-internal.c
@@ -92,6 +92,18 @@ static bool net_condition_test_strv(char * const *raw_patterns,
         return string && strv_fnmatch(raw_patterns, string, 0);
 }
 
+static bool net_condition_test_ifname(char * const *patterns, const char *ifname, char * const *alternative_names) {
+        if (net_condition_test_strv(patterns, ifname))
+                return true;
+
+        char * const *p;
+        STRV_FOREACH(p, alternative_names)
+                if (net_condition_test_strv(patterns, *p))
+                        return true;
+
+        return false;
+}
+
 bool net_match_config(Set *match_mac,
                       char * const *match_paths,
                       char * const *match_drivers,
@@ -107,7 +119,8 @@ bool net_match_config(Set *match_mac,
                       const char *dev_parent_driver,
                       const char *dev_driver,
                       const char *dev_type,
-                      const char *dev_name) {
+                      const char *dev_name,
+                      char * const *alternative_names) {
 
         if (match_host && condition_test(match_host) <= 0)
                 return false;
@@ -124,6 +137,9 @@ bool net_match_config(Set *match_mac,
         if (match_arch && condition_test(match_arch) <= 0)
                 return false;
 
+        if (!net_condition_test_ifname(match_names, dev_name, alternative_names))
+                return false;
+
         if (match_mac && dev_mac && !set_contains(match_mac, dev_mac))
                 return false;
 
@@ -214,7 +230,7 @@ int config_parse_match_ifnames(
                 if (r == 0)
                         break;
 
-                if (!ifname_valid(word)) {
+                if (!ifname_valid_full(word, ltype)) {
                         log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
                         return 0;
                 }
diff --git a/src/libsystemd-network/network-internal.h b/src/libsystemd-network/network-internal.h
index 9074758bbb..e1d098f3fe 100644
--- a/src/libsystemd-network/network-internal.h
+++ b/src/libsystemd-network/network-internal.h
@@ -29,7 +29,8 @@ bool net_match_config(Set *match_mac,
                       const char *dev_parent_driver,
                       const char *dev_driver,
                       const char *dev_type,
-                      const char *dev_name);
+                      const char *dev_name,
+                      char * const *alternative_names);
 
 CONFIG_PARSER_PROTOTYPE(config_parse_net_condition);
 CONFIG_PARSER_PROTOTYPE(config_parse_hwaddr);
diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c
index d07a1a1874..e5052f8f29 100644
--- a/src/udev/net/link-config.c
+++ b/src/udev/net/link-config.c
@@ -238,7 +238,8 @@ int link_config_get(link_config_ctx *ctx, struct udev_device *device,
                                      udev_device_get_driver(udev_device_get_parent(device)),
                                      udev_device_get_property_value(device, "ID_NET_DRIVER"),
                                      udev_device_get_devtype(device),
-                                     udev_device_get_sysname(device))) {
+                                     udev_device_get_sysname(device),
+                                     NULL)) {
                         if (link->match_name) {
                                 unsigned char name_assign_type = NET_NAME_UNKNOWN;