🍒gnrc_netif_ipv6_addr_pfx_idx

RIOT-OS · Feb 10, 2024 · e583f0d · e583f0d
1 parent d63f0e6
commit e583f0d
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diff --git a/sys/include/net/gnrc/netif/internal.h b/sys/include/net/gnrc/netif/internal.h
@@ -130,6 +130,28 @@ void gnrc_netif_ipv6_addr_remove_internal(gnrc_netif_t *netif,
 int gnrc_netif_ipv6_addr_idx(gnrc_netif_t *netif,
                              const ipv6_addr_t *addr);
 
+/**
+ * @brief   Returns the index of the first pfx
+ *          in gnrc_netif_t::ipv6_addrs of @p netif
+ *          where the first @p pfx_len bits match with @p pfx
+ *
+ * @pre `(netif != NULL) && (pfx != NULL)`
+ *
+ * Can be used to check if an address is assigned to an interface.
+ *
+ * @param[in] netif the network interface
+ * @param[in] pfx  the address to check
+ * @param[in] pfx_len the amount of bits to compare
+ *
+ * @note    Only available with @ref net_gnrc_ipv6 "gnrc_ipv6".
+ *
+ * @return  index of the first matching address
+ *          in gnrc_netif_t::ipv6_addrs of @p netif
+ * @return  -1, if no matching address found for @p netif
+ */
+int gnrc_netif_ipv6_addr_pfx_idx(gnrc_netif_t *netif,
+                                 const ipv6_addr_t *pfx, uint8_t pfx_len);
+
 /**
  * @brief   Gets state from address flags
  *

diff --git a/sys/net/gnrc/netif/gnrc_netif.c b/sys/net/gnrc/netif/gnrc_netif.c
@@ -502,6 +502,9 @@ void gnrc_netif_release(gnrc_netif_t *netif)
 
 #if IS_USED(MODULE_GNRC_NETIF_IPV6)
 static int _addr_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr);
+static int _addr_pfx_idx(const gnrc_netif_t *netif,
+                                const ipv6_addr_t *pfx,
+                                uint8_t pfx_len);
 static int _group_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr);
 
 static char addr_str[IPV6_ADDR_MAX_STR_LEN];
@@ -730,6 +733,23 @@ int gnrc_netif_ipv6_addr_idx(gnrc_netif_t *netif,
     return idx;
 }
 
+int gnrc_netif_ipv6_addr_pfx_idx(gnrc_netif_t *netif,
+                                 const ipv6_addr_t *pfx, uint8_t pfx_len)
+{
+    int idx;
+
+    assert((netif != NULL) && (pfx != NULL));
+    DEBUG("gnrc_netif: get index of first address matching %s/%u"
+          " from interface %" PRIkernel_pid "\n",
+          ipv6_addr_to_str(addr_str, pfx, sizeof(addr_str)),
+          pfx_len,
+          netif->pid);
+    gnrc_netif_acquire(netif);
+    idx = _addr_pfx_idx(netif, pfx, pfx_len);
+    gnrc_netif_release(netif);
+    return idx;
+}
+
 int gnrc_netif_ipv6_addr_match(gnrc_netif_t *netif,
                                const ipv6_addr_t *addr)
 {
@@ -947,11 +967,35 @@ static int _idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr, bool mcast)
     return -1;
 }
 
+static int _pfx_idx(const gnrc_netif_t *netif, const ipv6_addr_t *pfx, uint8_t pfx_len, bool mcast)
+{
+    //same as function @ref _idx above, but with generalized condition
+    if (!ipv6_addr_is_unspecified(pfx)) {
+        const ipv6_addr_t *iplist = (mcast) ? netif->ipv6.groups :
+                                    netif->ipv6.addrs;
+        unsigned ipmax = (mcast) ? GNRC_NETIF_IPV6_GROUPS_NUMOF :
+                         CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF;
+        for (unsigned i = 0; i < ipmax; i++) {
+            if (ipv6_addr_match_prefix(&iplist[i], pfx) >= pfx_len) {
+                return i;
+            }
+        }
+    }
+    return -1;
+}
+
 static inline int _addr_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr)
 {
     return _idx(netif, addr, false);
 }
 
+static inline int _addr_pfx_idx(const gnrc_netif_t *netif,
+                                const ipv6_addr_t *pfx,
+                                uint8_t pfx_len)
+{
+    return _pfx_idx(netif, pfx, pfx_len, false);
+}
+
 static inline int _group_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr)
 {
     return _idx(netif, addr, true);