add netdev ifindex feature

components/net/netdev/include/netdev.h

@@ -101,6 +101,8 @@ struct netdev
     netdev_callback_fn status_callback;                /* network interface device flags change callback */
     netdev_callback_fn addr_callback;                  /* network interface device address information change callback */
 
+    int ifindex;                                       /* network interface device ifindex */
+
 #ifdef RT_USING_SAL
     void *sal_user_data;                               /* user-specific data for SAL */
 #endif /* RT_USING_SAL */
@@ -153,6 +155,7 @@ int netdev_unregister(struct netdev *netdev);
 struct netdev *netdev_get_first_by_flags(uint16_t flags);
 struct netdev *netdev_get_by_ipaddr(ip_addr_t *ip_addr);
 struct netdev *netdev_get_by_name(const char *name);
+struct netdev *netdev_get_by_ifindex(int ifindex);
 #ifdef RT_USING_SAL
 struct netdev *netdev_get_by_family(int family);
 int netdev_family_get(struct netdev *netdev);

components/net/netdev/src/netdev.c

@@ -41,6 +41,7 @@ struct netdev *netdev_lo = RT_NULL;
 static netdev_callback_fn g_netdev_register_callback = RT_NULL;
 static netdev_callback_fn g_netdev_default_change_callback = RT_NULL;
 static RT_DEFINE_SPINLOCK(_spinlock);
+static int netdev_num;
 
 /**
  * This function will register network interface device and
@@ -115,6 +116,9 @@ int netdev_register(struct netdev *netdev, const char *name, void *user_data)
         rt_slist_append(&(netdev_list->list), &(netdev->list));
     }
 
+    netdev_num++;
+    netdev->ifindex = netdev_num;
+
     rt_spin_unlock_irqrestore(&_spinlock, level);
 
     if (netdev_default == RT_NULL)
@@ -333,6 +337,42 @@ struct netdev *netdev_get_by_name(const char *name)
     return RT_NULL;
 }
 
+/**
+ * This function will get network interface device
+ * in network interface device list by netdev ifindex.
+ *
+ * @param ifindex the ifindex of network interface device
+ *
+ * @return != NULL: network interface device object
+ *            NULL: get failed
+ */
+struct netdev *netdev_get_by_ifindex(int ifindex)
+{
+    rt_slist_t *node = RT_NULL;
+    struct netdev *netdev = RT_NULL;
+
+    if (netdev_list == RT_NULL)
+    {
+        return RT_NULL;
+    }
+
+    rt_spin_lock(&_spinlock);
+
+    for (node = &(netdev_list->list); node; node = rt_slist_next(node))
+    {
+        netdev = rt_slist_entry(node, struct netdev, list);
+        if (netdev && (netdev->ifindex == ifindex))
+        {
+            rt_spin_unlock(&_spinlock);
+            return netdev;
+        }
+    }
+
+    rt_spin_unlock(&_spinlock);
+
+    return RT_NULL;
+}
+
 #ifdef RT_USING_SAL
 /**
  * This function will get the first network interface device

components/net/sal/src/sal_socket.c

@@ -1474,6 +1474,19 @@ int sal_ioctlsocket(int socket, long cmd, void *arg)
             ifconf_tmp->ifc_ifcu.ifcu_buf =  ifconf_tmp->ifc_ifcu.ifcu_buf - sizeof(struct sal_ifreq) * count_size;
             return 0;
         }
+        case SIOCGIFINDEX:
+        {
+            for (node = &(cur_netdev_list->list); node; node = rt_slist_next(node))
+            {
+                netdev = rt_list_entry(node, struct netdev, list);
+                if (rt_strcmp(ifr->ifr_ifrn.ifrn_name, netdev->name) == 0)
+                {
+                    ifr->ifr_ifru.ifru_ivalue = netdev->ifindex;
+                    return 0;
+                }
+            }
+            return -ENODEV;
+        }
         default:
             break;
         }