Added input & route hooks for IPv6 to stay in line with IPv4

src/core/ipv6/ip6.c

@@ -83,6 +83,13 @@ ip6_route(const struct ip6_addr *src, const struct ip6_addr *dest)
   struct netif *netif;
   s8_t i;
 
+#ifdef LWIP_HOOK_IP6_ROUTE
+  netif = LWIP_HOOK_IP6_ROUTE(src, dest);
+  if (netif != NULL) {
+    return netif;
+  }
+#endif
+
   /* If single netif configuration, fast return. */
   if ((netif_list != NULL) && (netif_list->next == NULL)) {
     if (!netif_is_up(netif_list) || !netif_is_link_up(netif_list)) {
@@ -388,6 +395,13 @@ ip6_input(struct pbuf *p, struct netif *inp)
     return ERR_OK;
   }
 
+#ifdef LWIP_HOOK_IP6_INPUT
+  if (LWIP_HOOK_IP6_INPUT(p, inp)) {
+    /* the packet has been eaten */
+    return ERR_OK;
+  }
+#endif
+
   /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
   if ((IP6_HLEN > p->len) || ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len)) {
     if (IP6_HLEN > p->len) {

src/include/lwip/opt.h

@@ -2612,6 +2612,27 @@
  * not part of lwIP but can e.g. be hidden in the netif's state argument.
 */
 
+/**
+ * LWIP_HOOK_IP6_INPUT(pbuf, input_netif):
+ * - called from ip6_input() (IPv6)
+ * - pbuf: received struct pbuf passed to ip6_input()
+ * - input_netif: struct netif on which the packet has been received
+ * Return values:
+ * - 0: Hook has not consumed the packet, packet is processed as normal
+ * - != 0: Hook has consumed the packet.
+ * If the hook consumed the packet, 'pbuf' is in the responsibility of the hook
+ * (i.e. free it when done).
+ */
+
+/**
+ * LWIP_HOOK_IP6_ROUTE(src, dest):
+ * - called from ip6_route() (IPv6)
+ * - src: sourc IPv6 address
+ * - dest: destination IPv6 address
+ * Returns the destination netif or NULL if no destination netif is found. In
+ * that case, ip6_route() continues as normal.
+ */
+
 /**
  * LWIP_HOOK_VLAN_CHECK(netif, eth_hdr, vlan_hdr):
  * - called from ethernet_input() if VLAN support is enabled