Address policy update's

Wi-sun create own non preferred address policy for SLAAC.

Added new function for remove label if there is not exist any address interface anymore.

WS address remove calback handler use new policy label remove function.

Change-Id: I2781917855d6cf4572e23ff6a2436b66c42db158

Author: Juha Heiskanen

source/6LoWPAN/ws/ws_bbr_api.c

@@ -176,6 +176,7 @@ static int ws_bbr_static_ula_create(protocol_interface_info_entry_t *cur)
     }
     memcpy(static_ula_address, add_entry->address, 16);
     tr_info("BBR generate ula prefix addr %s", trace_ipv6(static_ula_address));
+    addr_policy_table_add_entry(static_dodag_prefix, 64, 2, WS_NON_PREFFRED_LABEL);
 
     return 0;
 }

source/6LoWPAN/ws/ws_bootstrap.c

@@ -144,6 +144,9 @@ static void ws_bootstrap_address_notification_cb(struct protocol_interface_info_
     } else if (reason == ADDR_CALLBACK_DELETED) {
         // What to do?
         // Go through address list and check if there is global address still available
+        //Discover prefix policy
+        addr_policy_remove_by_label(WS_NON_PREFFRED_LABEL);
+
         interface->global_address_available = false;
         ns_list_foreach(if_address_entry_t, addr_str, &interface->ip_addresses) {
             if (addr_ipv6_scope(addr_str->address, interface) > IPV6_SCOPE_LINK_LOCAL) {
@@ -1786,6 +1789,14 @@ static void ws_rpl_prefix_callback(prefix_entry_t *prefix, void *handle, uint8_t
     if (prefix->options & PIO_A) {
         if (icmpv6_slaac_prefix_update(cur, prefix->prefix, prefix->prefix_len, prefix->lifetime, prefix->preftime) != 0) {
             ipv6_interface_slaac_handler(cur, prefix->prefix, prefix->prefix_len, prefix->lifetime, prefix->preftime);
+            /*
+             * Give SLAAC addresses a different label and low precedence to indicate that
+             * they probably shouldn't be used for external traffic. SLAAC use in Wi-SUN is non-standard,
+             * and we use it for mesh-local traffic we should prefer any DHCP-assigned addresses
+             * for talking to the outside world
+             *
+             */
+            addr_policy_table_add_entry(prefix->prefix, prefix->prefix_len, 2, WS_NON_PREFFRED_LABEL);
         }
     } else if (prefix->prefix_len) {
         if (prefix->preftime == 0) {

source/6LoWPAN/ws/ws_common_defines.h

@@ -198,6 +198,12 @@ typedef struct ws_bs_ie {
 
 #define WS_NUD_RANDOM_COMPARE (WS_NUD_RAND_PROBABILITY*WS_NUD_RANDOM_SAMPLE_LENGTH) / 100
 
+/**
+ * Wi-sun spesific non-preferred prefix policy label
+ */
+
+#define WS_NON_PREFFRED_LABEL 36
+
 /*
  * Threshold (referenced to DEVICE_MIN_SENS) above which a neighbor node may be considered for inclusion into candidate parent set
  */

source/Core/include/ns_address_internal.h

@@ -178,6 +178,8 @@ struct if_address_entry *addr_get_entry(const struct protocol_interface_info_ent
 bool addr_is_assigned_to_interface(const struct protocol_interface_info_entry *interface, const uint8_t addr[__static 16]);
 bool addr_is_tentative_for_interface(const struct protocol_interface_info_entry *interface, const uint8_t addr[__static 16]);
 
+void addr_policy_remove_by_label(uint8_t label);
+
 void addr_duplicate_detected(struct protocol_interface_info_entry *interface, const uint8_t addr[__static 16]);
 
 struct if_group_entry *addr_add_group(struct protocol_interface_info_entry *interface, const uint8_t group[__static 16]);

source/Core/ns_address_internal.c

@@ -1405,6 +1405,21 @@ int8_t addr_interface_select_source(protocol_interface_info_entry_t *cur, uint8_
     return ret_val;
 }
 
+void addr_policy_remove_by_label(uint8_t label)
+{
+    ns_list_foreach_safe(addr_policy_table_entry_t, entry, &addr_policy_table) {
+        if (entry->label == label) {
+            /*
+             * Remove label policy if no local address matches"
+             */
+            if (!protocol_interface_any_address_match(entry->prefix, entry->prefix_len)) {
+                ns_list_remove(&addr_policy_table, entry);
+                ns_dyn_mem_free(entry);
+            }
+        }
+    }
+}
+
 // This last function must always be compiled with tracing enabled
 #ifndef FEA_TRACE_SUPPORT
 #define FEA_TRACE_SUPPORT 1

source/NWK_INTERFACE/Include/protocol.h

@@ -514,4 +514,5 @@ extern void protocol_core_dhcpv6_allocated_address_remove(protocol_interface_inf
 extern void nwk_bootsrap_state_update(arm_nwk_interface_status_type_e posted_event, protocol_interface_info_entry_t *cur);
 void bootsrap_next_state_kick(icmp_state_t new_state, protocol_interface_info_entry_t *cur);
 int8_t protocol_interface_address_compare(const uint8_t *addr);
+bool protocol_interface_any_address_match(const uint8_t *prefix, uint8_t prefix_len);
 #endif /* _NS_PROTOCOL_H */

source/NWK_INTERFACE/protocol_core.c

@@ -1135,3 +1135,27 @@ int8_t protocol_interface_address_compare(const uint8_t *addr)
     return -1;
 }
 
+static bool protocol_address_prefix_cmp(protocol_interface_info_entry_t *interface, const uint8_t *prefix, uint8_t prefix_len)
+{
+    ns_list_foreach(if_address_entry_t, adr, &interface->ip_addresses) {
+        if (bitsequal(adr->address, prefix, prefix_len)) {
+            /* Prefix  stil used at list so stop checking */
+            return true;
+        }
+    }
+    return false;
+}
+
+bool protocol_interface_any_address_match(const uint8_t *prefix, uint8_t prefix_len)
+{
+    ns_list_foreach(protocol_interface_info_entry_t, cur, &protocol_interface_info_list) {
+
+        if (protocol_address_prefix_cmp(cur, prefix, prefix_len)) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+

test/nanostack/unittest/libDHCPv6/dhcp_service_api/Makefile

@@ -21,6 +21,7 @@ TEST_SRC_FILES = \
         ../../stub/system_timer_stub.c \
         ../../stub/libDHCPv6_stub.c \
         ../../stub/protocol_core_stub.c \
+        ../../stub/address_stub.c \
         ../../stub/net_stub.c \
 
 include ../../MakefileWorker.mk

test/nanostack/unittest/stub/address_stub.c

@@ -345,3 +345,7 @@ int8_t addr_interface_select_source(protocol_interface_info_entry_t *cur, uint8_
 void addr_multicast_fwd_set_forwarding(struct protocol_interface_info_entry *interface, bool enable)
 {
 }
+
+void addr_policy_remove_by_label(uint8_t label)
+{
+}

test/nanostack/unittest/stub/protocol_core_stub.c

@@ -239,3 +239,8 @@ int8_t protocol_interface_address_compare(const uint8_t *addr)
     return protocol_core_stub.int8_value;
 }
 
+bool protocol_interface_any_address_match(const uint8_t *prefix, uint8_t prefix_len)
+{
+    return protocol_core_stub.bool_value;
+}
+