From 29104ded1cc8fcb423406ff2c8f577a1df5daeaf Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 2 Aug 2022 03:01:49 +0900
Subject: [PATCH] network: split link_ipv4ll_enabled() into two

And move it from networkd-link.[ch] to relevant files.
---
 src/network/networkd-ipv4acd.c | 30 +++++++++++++++++++++++++++
 src/network/networkd-ipv4acd.h |  1 +
 src/network/networkd-ipv4ll.c  | 16 +++++++++++++++
 src/network/networkd-ipv4ll.h  |  2 ++
 src/network/networkd-link.c    | 37 ----------------------------------
 src/network/networkd-link.h    |  2 --
 6 files changed, 49 insertions(+), 39 deletions(-)

diff --git a/src/network/networkd-ipv4acd.c b/src/network/networkd-ipv4acd.c
index 009cde27de..76aa2f83c8 100644
--- a/src/network/networkd-ipv4acd.c
+++ b/src/network/networkd-ipv4acd.c
@@ -1,14 +1,44 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <linux/if_arp.h>
+
 #include "sd-dhcp-client.h"
 #include "sd-ipv4acd.h"
 
+#include "ipvlan.h"
 #include "networkd-address.h"
 #include "networkd-dhcp4.h"
 #include "networkd-ipv4acd.h"
 #include "networkd-link.h"
 #include "networkd-manager.h"
 
+bool link_ipv4acd_supported(Link *link) {
+        assert(link);
+
+        if (link->flags & IFF_LOOPBACK)
+                return false;
+
+        /* ARPHRD_INFINIBAND seems to potentially support IPv4ACD.
+         * But currently sd-ipv4acd only supports ARPHRD_ETHER. */
+        if (link->iftype != ARPHRD_ETHER)
+                return false;
+
+        if (link->hw_addr.length != ETH_ALEN)
+                return false;
+
+        if (ether_addr_is_null(&link->hw_addr.ether))
+                return false;
+
+        if (streq_ptr(link->kind, "vrf"))
+                return false;
+
+        /* L3 or L3S mode do not support ARP. */
+        if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
+                return false;
+
+        return true;
+}
+
 static int static_ipv4acd_address_remove(Link *link, Address *address, bool on_conflict) {
         int r;
 
diff --git a/src/network/networkd-ipv4acd.h b/src/network/networkd-ipv4acd.h
index 6ebfa36289..7bd6a26b40 100644
--- a/src/network/networkd-ipv4acd.h
+++ b/src/network/networkd-ipv4acd.h
@@ -4,6 +4,7 @@
 typedef struct Address Address;
 typedef struct Link Link;
 
+bool link_ipv4acd_supported(Link *link);
 int ipv4acd_configure(Address *address);
 int ipv4acd_update_mac(Link *link);
 int ipv4acd_start(Link *link);
diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
index ac5bb217c3..8b0849d2d2 100644
--- a/src/network/networkd-ipv4ll.c
+++ b/src/network/networkd-ipv4ll.c
@@ -5,12 +5,28 @@
 
 #include "netif-util.h"
 #include "networkd-address.h"
+#include "networkd-ipv4acd.h"
 #include "networkd-ipv4ll.h"
 #include "networkd-link.h"
 #include "networkd-manager.h"
 #include "networkd-queue.h"
 #include "parse-util.h"
 
+bool link_ipv4ll_enabled(Link *link) {
+        assert(link);
+
+        if (!link_ipv4acd_supported(link))
+                return false;
+
+        if (!link->network)
+                return false;
+
+        if (link->network->bond)
+                return false;
+
+        return link->network->link_local & ADDRESS_FAMILY_IPV4;
+}
+
 static int address_new_from_ipv4ll(Link *link, Address **ret) {
         _cleanup_(address_freep) Address *address = NULL;
         struct in_addr addr;
diff --git a/src/network/networkd-ipv4ll.h b/src/network/networkd-ipv4ll.h
index f5c6928535..fa53bd2b39 100644
--- a/src/network/networkd-ipv4ll.h
+++ b/src/network/networkd-ipv4ll.h
@@ -7,6 +7,8 @@
 
 typedef struct Link Link;
 
+bool link_ipv4ll_enabled(Link *link);
+
 int ipv4ll_configure(Link *link);
 int ipv4ll_update_mac(Link *link);
 
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 35d1e2f206..269f69ec21 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -27,7 +27,6 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "glyph-util.h"
-#include "ipvlan.h"
 #include "missing_network.h"
 #include "netlink-util.h"
 #include "network-internal.h"
@@ -69,42 +68,6 @@
 #include "util.h"
 #include "vrf.h"
 
-bool link_ipv4ll_enabled(Link *link) {
-        assert(link);
-
-        if (link->flags & IFF_LOOPBACK)
-                return false;
-
-        if (!link->network)
-                return false;
-
-        if (link->iftype == ARPHRD_CAN)
-                return false;
-
-        if (link->hw_addr.length != ETH_ALEN)
-                return false;
-
-        if (ether_addr_is_null(&link->hw_addr.ether))
-                return false;
-
-        /* ARPHRD_INFINIBAND seems to potentially support IPv4LL.
-         * But currently sd-ipv4ll and sd-ipv4acd only support ARPHRD_ETHER. */
-        if (link->iftype != ARPHRD_ETHER)
-                return false;
-
-        if (streq_ptr(link->kind, "vrf"))
-                return false;
-
-        /* L3 or L3S mode do not support ARP. */
-        if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
-                return false;
-
-        if (link->network->bond)
-                return false;
-
-        return link->network->link_local & ADDRESS_FAMILY_IPV4;
-}
-
 bool link_ipv6_enabled(Link *link) {
         assert(link);
 
diff --git a/src/network/networkd-link.h b/src/network/networkd-link.h
index dfe43bb3a0..807fb44709 100644
--- a/src/network/networkd-link.h
+++ b/src/network/networkd-link.h
@@ -225,8 +225,6 @@ static inline bool link_has_carrier(Link *link) {
 bool link_ipv6_enabled(Link *link);
 int link_ipv6ll_gained(Link *link);
 
-bool link_ipv4ll_enabled(Link *link);
-
 int link_stop_engines(Link *link, bool may_keep_dhcp);
 
 const char* link_state_to_string(LinkState s) _const_;
-- 
2.25.1