netutils/netlib: Add support for add/del a single IPv6 address

Note:
The `SIOCSIFADDR` and `SIOCDIFADDR` uses different params for `AF_INET` and `AF_INET6` (`struct ifreq` vs `struct in6_ifreq`) as defined by https://man7.org/linux/man-pages/man7/netdevice.7.html

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>

include/netutils/netlib.h

@@ -239,7 +239,21 @@ int netlib_get_ipv4netmask(FAR const char *ifname, FAR struct in_addr *addr);
 int netlib_ipv4adaptor(in_addr_t destipaddr, FAR in_addr_t *srcipaddr);
 #endif
 
+/* We support multiple IPv6 addresses on a single interface.
+ * Recommend to use netlib_add/del_ipv6addr to manage them, by which you
+ * don't need to care about the slot it stored.
+ *
+ * Previous interfaces can still work, the ifname can be <eth>:<num>,
+ * e.g. eth0:0 stands for managing the secondary address on eth0
+ */
+
 #ifdef CONFIG_NET_IPv6
+#  ifdef CONFIG_NETDEV_MULTIPLE_IPv6
+int netlib_add_ipv6addr(FAR const char *ifname,
+                        FAR const struct in6_addr *addr, uint8_t preflen);
+int netlib_del_ipv6addr(FAR const char *ifname,
+                        FAR const struct in6_addr *addr, uint8_t preflen);
+#  endif
 int netlib_get_ipv6addr(FAR const char *ifname, FAR struct in6_addr *addr);
 int netlib_set_ipv6addr(FAR const char *ifname,
                         FAR const struct in6_addr *addr);

netutils/netlib/CMakeLists.txt

@@ -56,6 +56,7 @@ if(CONFIG_NETUTILS_NETLIB)
   endif()
 
   if(CONFIG_NET_IPv6)
+    list(APPEND SRCS netlib_addipv6addr.c netlib_delipv6addr.c)
     list(APPEND SRCS netlib_setipv6addr.c netlib_getipv6addr.c)
     list(APPEND SRCS netlib_setdripv6addr.c netlib_setipv6netmask.c)
     list(APPEND SRCS netlib_prefix2ipv6netmask.c netlib_ipv6netmask2prefix.c)

netutils/netlib/Makefile

@@ -56,6 +56,7 @@ endif
 endif
 
 ifeq ($(CONFIG_NET_IPv6),y)
+CSRCS += netlib_addipv6addr.c netlib_delipv6addr.c
 CSRCS += netlib_setipv6addr.c netlib_getipv6addr.c
 CSRCS += netlib_setdripv6addr.c netlib_setipv6netmask.c
 CSRCS += netlib_prefix2ipv6netmask.c netlib_ipv6netmask2prefix.c

netutils/netlib/netlib_addipv6addr.c

@@ -0,0 +1,100 @@
+/****************************************************************************
+ * apps/netutils/netlib/netlib_addipv6addr.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#ifdef CONFIG_NETDEV_MULTIPLE_IPv6
+
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <netinet/in.h>
+#include <net/if.h>
+
+#include "netutils/netlib.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: netlib_add_ipv6addr
+ *
+ * Description:
+ *   Add an IPv6 address to the network driver
+ *
+ * Parameters:
+ *   ifname   The name of the interface to use
+ *   ipaddr   The address to add
+ *   preflen  The prefix length of the address
+ *
+ * Return:
+ *   0 on success; -1 on failure
+ *
+ ****************************************************************************/
+
+int netlib_add_ipv6addr(FAR const char *ifname,
+                        FAR const struct in6_addr *addr, uint8_t preflen)
+{
+  int ret = ERROR;
+
+  if (ifname && addr)
+    {
+      int sockfd = socket(AF_INET6, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
+      if (sockfd >= 0)
+        {
+          struct ifreq req;
+          struct in6_ifreq ifr6;
+
+          /* Add the device name to the request */
+
+          strlcpy(req.ifr_name, ifname, IFNAMSIZ);
+
+          /* Get interface index */
+
+          ret = ioctl(sockfd, SIOCGIFINDEX,
+                     ((unsigned long)(uintptr_t)&req));
+          if (ret == OK)
+            {
+              /* Add address to the interface. */
+
+              ifr6.ifr6_ifindex = req.ifr_ifindex;
+              ifr6.ifr6_prefixlen = preflen;
+              memcpy(&ifr6.ifr6_addr, addr, sizeof(struct in6_addr));
+
+              ret = ioctl(sockfd, SIOCSIFADDR,
+                          ((unsigned long)(uintptr_t)&ifr6));
+            }
+
+          close(sockfd);
+        }
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_NETDEV_MULTIPLE_IPv6 */

netutils/netlib/netlib_delipv6addr.c

@@ -0,0 +1,100 @@
+/****************************************************************************
+ * apps/netutils/netlib/netlib_delipv6addr.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#ifdef CONFIG_NETDEV_MULTIPLE_IPv6
+
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <netinet/in.h>
+#include <net/if.h>
+
+#include "netutils/netlib.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: netlib_del_ipv6addr
+ *
+ * Description:
+ *   Remove an IPv6 address from the network driver
+ *
+ * Parameters:
+ *   ifname   The name of the interface to use
+ *   ipaddr   The address to delete
+ *   preflen  The prefix length of the address
+ *
+ * Return:
+ *   0 on success; -1 on failure
+ *
+ ****************************************************************************/
+
+int netlib_del_ipv6addr(FAR const char *ifname,
+                        FAR const struct in6_addr *addr, uint8_t preflen)
+{
+  int ret = ERROR;
+
+  if (ifname && addr)
+    {
+      int sockfd = socket(AF_INET6, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
+      if (sockfd >= 0)
+        {
+          struct ifreq req;
+          struct in6_ifreq ifr6;
+
+          /* Add the device name to the request */
+
+          strlcpy(req.ifr_name, ifname, IFNAMSIZ);
+
+          /* Get interface index */
+
+          ret = ioctl(sockfd, SIOCGIFINDEX,
+                     ((unsigned long)(uintptr_t)&req));
+          if (ret == OK)
+            {
+              /* Delete address from the interface. */
+
+              ifr6.ifr6_ifindex = req.ifr_ifindex;
+              ifr6.ifr6_prefixlen = preflen;
+              memcpy(&ifr6.ifr6_addr, addr, sizeof(struct in6_addr));
+
+              ret = ioctl(sockfd, SIOCDIFADDR,
+                          ((unsigned long)(uintptr_t)&ifr6));
+            }
+
+          close(sockfd);
+        }
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_NETDEV_MULTIPLE_IPv6 */

netutils/netlib/netlib_setipv4addr.c

@@ -63,7 +63,7 @@ int netlib_set_ipv4addr(FAR const char *ifname,
 
   if (ifname && addr)
     {
-      int sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
+      int sockfd = socket(AF_INET, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
       if (sockfd >= 0)
         {
           FAR struct sockaddr_in *inaddr;