From 1e65eb4936ad50ff70eabf5e05dfe936fcb1467f Mon Sep 17 00:00:00 2001
From: Simon Goldschmidt <goldsimon@gmx.de>
Date: Fri, 17 Jan 2014 21:55:46 +0100
Subject: [PATCH] Added IPv6 loopback address to loopback-netif, fixed last
 commit

---
 CHANGELOG                |  3 +++
 src/core/ipv4/ip4.c      |  4 ++--
 src/core/ipv6/ip6.c      |  8 ++++----
 src/core/netif.c         | 36 +++++++++++++++++++++++++++++++-----
 src/include/lwip/netif.h |  2 +-
 5 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/CHANGELOG b/CHANGELOG
index 8b9e502c..1b54f4ab 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -80,6 +80,9 @@ HISTORY
 
  ++ Bugfixes:
 
+  2014-01-17: Grant Erickson, Jay Logue, Simon Goldschmidt
+  * ipv6.c, netif.c: patch #7913 Enable Support for IPv6 Loopback
+
   2014-01-16: Stathis Voukelatos
   * netif.c: patch #7902 Fixed netif_poll() operation when LWIP_LOOPBACK_MAX_PBUFS > 0
 
diff --git a/src/core/ipv4/ip4.c b/src/core/ipv4/ip4.c
index 4b38999c..04a36111 100644
--- a/src/core/ipv4/ip4.c
+++ b/src/core/ipv4/ip4.c
@@ -772,11 +772,11 @@ err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
   if (ip_addr_cmp(dest, &netif->ip_addr)) {
     /* Packet to self, enqueue it for loopback */
     LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
-    return netif_loop_output(netif, p, dest);
+    return netif_loop_output(netif, p);
   }
 #if LWIP_IGMP
   if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
-    netif_loop_output(netif, p, dest);
+    netif_loop_output(netif, p);
   }
 #endif /* LWIP_IGMP */
 #endif /* ENABLE_LOOPBACK */
diff --git a/src/core/ipv6/ip6.c b/src/core/ipv6/ip6.c
index d188f6c5..5ab51848 100644
--- a/src/core/ipv6/ip6.c
+++ b/src/core/ipv6/ip6.c
@@ -803,13 +803,13 @@ ip6_output_if(struct pbuf *p, ip6_addr_t *src, ip6_addr_t *dest,
 
 #if ENABLE_LOOPBACK
   {
-	int i;
+    int i;
     for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
       if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
           ip6_addr_cmp(dest, netif_ip6_addr(netif, i))) {
-		/* Packet to self, enqueue it for loopback */
-		LWIP_DEBUGF(IP6_DEBUG, ("netif_loop_output()\n"));
-		return netif_loop_output(netif, p, dest);
+        /* Packet to self, enqueue it for loopback */
+        LWIP_DEBUGF(IP6_DEBUG, ("netif_loop_output()\n"));
+        return netif_loop_output(netif, p);
       }
     }
   }
diff --git a/src/core/netif.c b/src/core/netif.c
index e8b0ee98..919d36f0 100644
--- a/src/core/netif.c
+++ b/src/core/netif.c
@@ -95,6 +95,10 @@ static err_t netif_null_output_ip6(struct netif *netif, struct pbuf *p, ip6_addr
 #endif
 
 #if LWIP_HAVE_LOOPIF
+static err_t netif_loop_output_ipv4(struct netif *netif, struct pbuf *p, ip_addr_t* addr);
+static err_t netif_loop_output_ipv6(struct netif *netif, struct pbuf *p, ip6_addr_t* addr);
+
+
 static struct netif loop_netif;
 
 /**
@@ -114,7 +118,8 @@ netif_loopif_init(struct netif *netif)
 
   netif->name[0] = 'l';
   netif->name[1] = 'o';
-  netif->output = netif_loop_output;
+  netif->output = netif_loop_output_ipv4;
+  netif->output_ip6 = netif_loop_output_ipv6;
   return ERR_OK;
 }
 #endif /* LWIP_HAVE_LOOPIF */
@@ -133,6 +138,15 @@ netif_init(void)
 #else  /* NO_SYS */
   netif_add(&loop_netif, &loop_ipaddr, &loop_netmask, &loop_gw, NULL, netif_loopif_init, tcpip_input);
 #endif /* NO_SYS */
+
+#if LWIP_IPV6
+  loop_netif.ip6_addr[0].addr[0] = 0;
+  loop_netif.ip6_addr[0].addr[1] = 0;
+  loop_netif.ip6_addr[0].addr[2] = 0;
+  loop_netif.ip6_addr[0].addr[3] = PP_HTONL(0x00000001UL);
+  loop_netif.ip6_addr_state[0] = IP6_ADDR_VALID;
+#endif /* LWIP_IPV6 */
+
   netif_set_up(&loop_netif);
 
 #endif /* LWIP_HAVE_LOOPIF */
@@ -661,13 +675,11 @@ void netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_
  *
  * @param netif the lwip network interface structure
  * @param p the (IP) packet to 'send'
- * @param ipaddr the ip address to send the packet to (not used)
  * @return ERR_OK if the packet has been sent
  *         ERR_MEM if the pbuf used to copy the packet couldn't be allocated
  */
 err_t
-netif_loop_output(struct netif *netif, struct pbuf *p,
-       ip_addr_t *ipaddr)
+netif_loop_output(struct netif *netif, struct pbuf *p)
 {
   struct pbuf *r;
   err_t err;
@@ -685,7 +697,6 @@ netif_loop_output(struct netif *netif, struct pbuf *p,
 #endif /* LWIP_HAVE_LOOPIF */
 #endif /* LWIP_SNMP */
   SYS_ARCH_DECL_PROTECT(lev);
-  LWIP_UNUSED_ARG(ipaddr);
 
   /* Allocate a new pbuf */
   r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
@@ -747,6 +758,21 @@ netif_loop_output(struct netif *netif, struct pbuf *p,
   return ERR_OK;
 }
 
+static err_t
+netif_loop_output_ipv4(struct netif *netif, struct pbuf *p, ip_addr_t* addr)
+{
+  LWIP_UNUSED_ARG(addr);
+  return netif_loop_output(netif, p);
+}
+
+static err_t
+netif_loop_output_ipv6(struct netif *netif, struct pbuf *p, ip6_addr_t* addr)
+{
+  LWIP_UNUSED_ARG(addr);
+  return netif_loop_output(netif, p);
+}
+
+
 /**
  * Call netif_poll() in the main loop of your application. This is to prevent
  * reentering non-reentrant functions like tcp_input(). Packets passed to
diff --git a/src/include/lwip/netif.h b/src/include/lwip/netif.h
index 322d2d0e..b2c8d87a 100644
--- a/src/include/lwip/netif.h
+++ b/src/include/lwip/netif.h
@@ -359,7 +359,7 @@ void netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_
 #endif /* LWIP_IGMP */
 
 #if ENABLE_LOOPBACK
-err_t netif_loop_output(struct netif *netif, struct pbuf *p, ip_addr_t *dest_ip);
+err_t netif_loop_output(struct netif *netif, struct pbuf *p);
 void netif_poll(struct netif *netif);
 #if !LWIP_NETIF_LOOPBACK_MULTITHREADING
 void netif_poll_all(void);