From 8796293c5a6b2f72dafbee9f56c201434e7b8abb Mon Sep 17 00:00:00 2001
From: Erik Ekman <eekman@google.com>
Date: Mon, 11 Oct 2021 22:40:01 +0200
Subject: [PATCH 1/3] pkg/lwip: Implement getting option NETOPT_IPV6_ADDR

---
 pkg/lwip/contrib/_netif.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/pkg/lwip/contrib/_netif.c b/pkg/lwip/contrib/_netif.c
index ec0d8b14aa..4ba0fbaa25 100644
--- a/pkg/lwip/contrib/_netif.c
+++ b/pkg/lwip/contrib/_netif.c
@@ -13,6 +13,7 @@
  *
  * @file
  * @author  Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * @author  Erik Ekman <eekman@google.com>
  */
 
 #include "fmt.h"
@@ -32,4 +33,37 @@ int netif_get_name(netif_t *iface, char *name)
     return res;
 }
 
+int netif_get_opt(netif_t *iface, netopt_t opt, uint16_t context,
+                  void *value, size_t max_len)
+{
+    (void)context;
+    lwip_netif_t *lwip_netif = (lwip_netif_t*) iface;
+    struct netif *netif = &lwip_netif->lwip_netif;
+    int res = -ENOTSUP;
+    switch (opt) {
+#ifdef MODULE_LWIP_IPV6
+        case NETOPT_IPV6_ADDR: {
+                assert(max_len >= sizeof(ipv6_addr_t));
+                ipv6_addr_t *tgt = value;
+
+                res = 0;
+                for (unsigned i = 0;
+                     ((res + sizeof(ipv6_addr_t)) <= max_len) &&
+                     (i < LWIP_IPV6_NUM_ADDRESSES);
+                     i++) {
+                    if (netif_ip6_addr_state(netif, i) != IP6_ADDR_INVALID) {
+                        memcpy(tgt, &(netif_ip6_addr(netif, i)->addr), sizeof(ipv6_addr_t));
+                        res += sizeof(ipv6_addr_t);
+                        tgt++;
+                    }
+                }
+            }
+            break;
+#endif
+        default:
+            break;
+    }
+    return res;
+}
+
 /** @} */

From 4679d3d06eeb4007a0cb3cc48dc28d2ad213b758 Mon Sep 17 00:00:00 2001
From: Erik Ekman <eekman@google.com>
Date: Mon, 11 Oct 2021 22:53:11 +0200
Subject: [PATCH 2/3] pkg/lwip: Fall back to netdev when getting options

Adds support for mac address, link state and more
---
 pkg/lwip/contrib/_netif.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkg/lwip/contrib/_netif.c b/pkg/lwip/contrib/_netif.c
index 4ba0fbaa25..9aacbf6b6d 100644
--- a/pkg/lwip/contrib/_netif.c
+++ b/pkg/lwip/contrib/_netif.c
@@ -39,6 +39,7 @@ int netif_get_opt(netif_t *iface, netopt_t opt, uint16_t context,
     (void)context;
     lwip_netif_t *lwip_netif = (lwip_netif_t*) iface;
     struct netif *netif = &lwip_netif->lwip_netif;
+    struct netdev *dev = netif->state;
     int res = -ENOTSUP;
     switch (opt) {
 #ifdef MODULE_LWIP_IPV6
@@ -63,6 +64,10 @@ int netif_get_opt(netif_t *iface, netopt_t opt, uint16_t context,
         default:
             break;
     }
+    if (res == -ENOTSUP) {
+        // Ask underlying netdev
+        res = dev->driver->get(dev, opt, value, max_len);
+    }
     return res;
 }
 

From 7b84b3a3f56e175accd577c66137647ce1cf16a2 Mon Sep 17 00:00:00 2001
From: Erik Ekman <eekman@google.com>
Date: Mon, 11 Oct 2021 23:01:46 +0200
Subject: [PATCH 3/3] pkg/lwip: Add empty netif_setopt

To fully implement net/netif.h
---
 pkg/lwip/contrib/_netif.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pkg/lwip/contrib/_netif.c b/pkg/lwip/contrib/_netif.c
index 9aacbf6b6d..2a30b36c38 100644
--- a/pkg/lwip/contrib/_netif.c
+++ b/pkg/lwip/contrib/_netif.c
@@ -71,4 +71,16 @@ int netif_get_opt(netif_t *iface, netopt_t opt, uint16_t context,
     return res;
 }
 
+int netif_set_opt(netif_t *iface, netopt_t opt, uint16_t context,
+                  void *value, size_t value_len)
+{
+    (void)iface;
+    (void)opt;
+    (void)context;
+    (void)value;
+    (void)value_len;
+
+    return -ENOTSUP;
+}
+
 /** @} */