From 8a8058a43610ba4ed8fe1bb1d05041c346b8e4f0 Mon Sep 17 00:00:00 2001
From: Simon Goldschmidt <goldsimon@gmx.de>
Date: Sun, 12 Jan 2020 20:30:22 +0100
Subject: [PATCH] netif: add IPV4_ADDR_VALID ext status callback reason

This ext-callback reason is always issued when an IPv4 config
has been set, even if it has not changed (e.g. DHCP reboot)

See bug #55121
---
 src/core/netif.c         | 6 ++++++
 src/include/lwip/netif.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/src/core/netif.c b/src/core/netif.c
index 34842e22..fd91b31a 100644
--- a/src/core/netif.c
+++ b/src/core/netif.c
@@ -739,6 +739,12 @@ netif_set_addr(struct netif *netif, const ip4_addr_t *ipaddr, const ip4_addr_t *
 #if LWIP_NETIF_EXT_STATUS_CALLBACK
   if (change_reason != LWIP_NSC_NONE) {
     change_reason |= LWIP_NSC_IPV4_SETTINGS_CHANGED;
+  }
+  if (!remove) {
+    /* Isssue a callback even if the address hasn't changed, eg. DHCP reboot */
+    change_reason |= LWIP_NSC_IPV4_ADDR_VALID;
+  }
+  if (change_reason != LWIP_NSC_NONE) {
     netif_invoke_ext_callback(netif, change_reason, &cb_args);
   }
 #endif
diff --git a/src/include/lwip/netif.h b/src/include/lwip/netif.h
index 984e4a7b..1bdb14ee 100644
--- a/src/include/lwip/netif.h
+++ b/src/include/lwip/netif.h
@@ -599,6 +599,8 @@ typedef u16_t netif_nsc_reason_t;
 #define LWIP_NSC_IPV6_SET                 0x0100
 /** IPv6 address state has changed */
 #define LWIP_NSC_IPV6_ADDR_STATE_CHANGED  0x0200
+/** IPv4 settings: valid address set, application may start to communicate */
+#define LWIP_NSC_IPV4_ADDR_VALID          0x0400
 
 /** @ingroup netif
  * Argument supplied to netif_ext_callback_fn.