gnrc/ipv6/nib: allow for predictable static link-local addresses

RIOT-OS · Jan 3, 2024 · ec8271e · ec8271e
1 parent 26682d8
commit ec8271e
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/sys/include/net/gnrc/ipv6.h b/sys/include/net/gnrc/ipv6.h
@@ -170,6 +170,16 @@ extern "C" {
 #endif /* DOXYGEN */
 /** @} */
 
+/**
+ * @brief   Use the same static IPv6 link local address on every network interface
+ *
+ * When GNRC_IPV6_STATIC_LLADDR is used, to not add the interface pid to the set
+ * static address but use the same static link local address for all interfaces.
+ */
+#ifndef CONFIG_GNRC_IPV6_STATIC_LLADDR_IS_FIXED
+#define CONFIG_GNRC_IPV6_STATIC_LLADDR_IS_FIXED 0
+#endif
+
 /**
  * @brief Message queue size to use for the IPv6 thread.
  */

diff --git a/sys/net/gnrc/network_layer/ipv6/nib/nib.c b/sys/net/gnrc/network_layer/ipv6/nib/nib.c
@@ -124,7 +124,9 @@ static void _add_static_lladdr(gnrc_netif_t *netif)
     ipv6_addr_t lladdr;
 
     if (ipv6_addr_from_str(&lladdr, lladdr_str) != NULL) {
-        lladdr.u8[15] += netif->pid;
+        if (!IS_ACTIVE(CONFIG_GNRC_IPV6_STATIC_LLADDR_IS_FIXED)) {
+            lladdr.u8[15] += netif->pid;
+        }
         assert(ipv6_addr_is_link_local(&lladdr));
         gnrc_netif_ipv6_addr_add_internal(
                 netif, &lladdr, 64U, GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID