[PATCH 2/2] batman-adv: mcast: rename br_ip's u member to dst

[Sven Eckelmann <sven@narfation.org>]

From: Nikolay Aleksandrov <nikolay@nvidia.com>

Since now we have src in br_ip, u no longer makes sense so rename
it to dst. No functional changes.

Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[sven@narfation.org: Add compat code]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 compat-include/linux/if_bridge.h | 26 ++++++++++++++++++++++++++
 compat-patches/replacements.sh   |  5 +++++
 net/batman-adv/multicast.c       | 14 +++++++-------
 3 files changed, 38 insertions(+), 7 deletions(-)
 create mode 100644 compat-include/linux/if_bridge.h

diff --git a/compat-include/linux/if_bridge.h b/compat-include/linux/if_bridge.h
new file mode 100644
index 00000000..7b6d5876
--- /dev/null
+++ b/compat-include/linux/if_bridge.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2007-2020  B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This file contains macros for maintaining compatibility with older versions
+ * of the Linux kernel.
+ */
+
+#ifndef _NET_BATMAN_ADV_COMPAT_LINUX_IF_BRIDGE_H_
+#define _NET_BATMAN_ADV_COMPAT_LINUX_IF_BRIDGE_H_
+
+#include <linux/version.h>
+#include_next <linux/if_bridge.h>
+
+#if LINUX_VERSION_IS_LESS(5, 10, 0)
+
+#define BATADV_BR_IP_UNION u
+
+#else
+
+#define BATADV_BR_IP_UNION dst
+
+#endif /* LINUX_VERSION_IS_LESS(5, 10, 0) */
+
+#endif	/* _NET_BATMAN_ADV_COMPAT_LINUX_IF_BRIDGE_H_ */
diff --git a/compat-patches/replacements.sh b/compat-patches/replacements.sh
index 1b64e5c2..e72ec5ec 100755
--- a/compat-patches/replacements.sh
+++ b/compat-patches/replacements.sh
@@ -3,3 +3,8 @@
 # Copyright (C) 2007-2018  B.A.T.M.A.N. contributors
 
 set -e
+
+# for kernel < 5.10 to enable br_ip compat code
+sed -i \
+	-e 's/\(->\|\.\)dst\.ip/\1BATADV_BR_IP_UNION.ip/' \
+	build/net/batman-adv/multicast.c
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 0746fe2c..9af99c39 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -221,7 +221,7 @@ static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv,
 		 * address here, only IPv6 ones
 		 */
 		if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) &&
-		    ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.u.ip6))
+		    ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.dst.ip6))
 			flags &= ~BATADV_MCAST_WANT_NO_RTR6;
 
 		list_del(&br_ip_entry->list);
@@ -562,10 +562,10 @@ batadv_mcast_mla_softif_get(struct net_device *dev,
 static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src)
 {
 	if (src->proto == htons(ETH_P_IP))
-		ip_eth_mc_map(src->u.ip4, dst);
+		ip_eth_mc_map(src->dst.ip4, dst);
 #if IS_ENABLED(CONFIG_IPV6)
 	else if (src->proto == htons(ETH_P_IPV6))
-		ipv6_eth_mc_map(&src->u.ip6, dst);
+		ipv6_eth_mc_map(&src->dst.ip6, dst);
 #endif
 	else
 		eth_zero_addr(dst);
@@ -609,11 +609,11 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev,
 				continue;
 
 			if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
-			    ipv4_is_local_multicast(br_ip_entry->addr.u.ip4))
+			    ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4))
 				continue;
 
 			if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) &&
-			    !ipv4_is_local_multicast(br_ip_entry->addr.u.ip4))
+			    !ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4))
 				continue;
 		}
 
@@ -623,11 +623,11 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev,
 				continue;
 
 			if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
-			    ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.u.ip6))
+			    ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.dst.ip6))
 				continue;
 
 			if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) &&
-			    IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.u.ip6) >
+			    IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.dst.ip6) >
 			    IPV6_ADDR_SCOPE_LINKLOCAL)
 				continue;
 		}
-- 
2.28.0