[rtems-lwip commit] rtemslwip/ifaddrs: Set loopback flag

[Joel Sherrill]

Module:    rtems-lwip
Branch:    master
Commit:    c43456fdf681a967f00c71cfefd29b497fdda7ca
Changeset: http://git.rtems.org/rtems-lwip/commit/?id=c43456fdf681a967f00c71cfefd29b497fdda7ca

Author:    Kinsey Moore <kinsey.moore at oarcorp.com>
Date:      Thu Mar 23 13:58:45 2023 -0500

rtemslwip/ifaddrs: Set loopback flag

Some consumers of getifaddrs() depend on the loopback flag being set
appropriately to filter interfaces. Make sure that requirement is
satisfied.

---

 rtemslwip/bsd_compat/ifaddrs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rtemslwip/bsd_compat/ifaddrs.c b/rtemslwip/bsd_compat/ifaddrs.c
index dc6b7f2..9b97d4e 100644
--- a/rtemslwip/bsd_compat/ifaddrs.c
+++ b/rtemslwip/bsd_compat/ifaddrs.c
@@ -65,6 +65,12 @@ static struct ifaddrs *create_ifaddr_from_netif(struct netif *netif)
   inet_addr_from_ip4addr(&((struct sockaddr_in *)ifaddr->ifa_addr)->sin_addr, &netif->ip_addr.u_addr.ip4);
   inet_addr_from_ip4addr(&((struct sockaddr_in *)ifaddr->ifa_netmask)->sin_addr, &netif->netmask.u_addr.ip4);
   ((struct sockaddr_in *)ifaddr->ifa_netmask)->sin_addr.s_addr = netif->ip_addr.u_addr.ip4.addr & netif->netmask.u_addr.ip4.addr;
+
+  /* Set IFF_LOOPBACK flag if appropriate */
+  if (127 != (ip4_addr_get_u32(&netif->ip_addr.u_addr.ip4) >> 24)) {
+    ifaddr->ifa_flags |= IFF_LOOPBACK;
+  }
+
   return ifaddr;
 }