[PATCH] lwip: use default values for invalid IPv4 addresses

[Joan Lledó]

From: Joan Lledó <jlle...@member.fsf.org>

When configuring a network interface with an invalid IPv4 address
(INADDR_ANY or INADDR_NONE), set the address to INADDR_ANY and the
netmask to 255.0.0.0 instead of INADDR_NONE. This passes validation
and is consistent with pfinet behavior

* lwip/lwip-util.c (init_ifs, configure_device): Use INADDR_ANY and
inet_addr ("255.0.0.0") as defaults for invalid addresses.
---
 lwip/lwip-util.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lwip/lwip-util.c b/lwip/lwip-util.c
index d6c3f41e..4a83b8f0 100644
--- a/lwip/lwip-util.c
+++ b/lwip/lwip-util.c
@@ -171,12 +171,12 @@ init_ifs (void *arg)
 
       /*
        * The caller is trying to set an invalid address,
-       * set all fields to empty so it passes the validation
+       * set all fields to default values so it passes the validation
        */
       if (in->address.addr == INADDR_ANY || in->address.addr == INADDR_NONE)
        {
-         in->address.addr = INADDR_NONE;
-         in->netmask.addr = INADDR_NONE;
+         in->address.addr = INADDR_ANY;
+         in->netmask.addr = inet_addr ("255.0.0.0");
          in->peer.addr = INADDR_NONE;
          in->gateway.addr = INADDR_NONE;
        }
@@ -342,8 +342,8 @@ configure_device (struct netif *netif, ip4_addr_t addr, 
ip4_addr_t netmask,
    */
   if (addr.addr == INADDR_ANY || addr.addr == INADDR_NONE)
     {
-      addr.addr = INADDR_NONE;
-      netmask.addr = INADDR_NONE;
+      addr.addr = INADDR_ANY;
+      netmask.addr = inet_addr ("255.0.0.0");
       peer.addr = INADDR_NONE;
       broadcast.addr = INADDR_NONE;
       gateway.addr = INADDR_NONE;
-- 
2.50.1