lwip - Added option to set static IP addresses

Provided through the config options added to the network interface:
- EthernetInterface::set_network(ip_address, netmask, gateway)
- EthernetInterface::set_dhcp(dhcp)

Author: geky

features/net/FEATURE_IPV4/lwip-interface/EthernetInterface.cpp

@@ -19,24 +19,57 @@
 
 
 /* Interface implementation */
+EthernetInterface::EthernetInterface()
+    : _dhcp(false), _ip_address(), _netmask(), _gateway()
+{
+}
+
+int EthernetInterface::set_network(const char *ip_address, const char *netmask, const char *gateway)
+{
+    _dhcp = false;
+    strncpy(_ip_address, ip_address ? ip_address : "", sizeof(_ip_address));
+    strncpy(_netmask, netmask ? netmask : "", sizeof(_netmask));
+    strncpy(_gateway, gateway ? gateway : "", sizeof(_gateway));
+    return 0;
+}
+
+int EthernetInterface::set_dhcp(bool dhcp)
+{
+    _dhcp = dhcp;
+    return 0;
+}
+
 int EthernetInterface::connect()
 {
-    return lwip_bringup();
+    return lwip_bringup(_dhcp,
+            _ip_address[0] ? _ip_address : 0,
+            _netmask[0] ? _netmask : 0,
+            _gateway[0] ? _gateway : 0);
 }
 
 int EthernetInterface::disconnect()
 {
     return lwip_bringdown();
 }
 
+const char *EthernetInterface::get_mac_address()
+{
+    return lwip_get_mac_address();
+}
+
 const char *EthernetInterface::get_ip_address()
 {
     return lwip_get_ip_address();
 }
 
-const char *EthernetInterface::get_mac_address()
+const char *EthernetInterface::get_netmask()
 {
-    return lwip_get_mac_address();
+    return lwip_get_netmask();
+}
+
+const char *EthernetInterface::get_gateway()
+{
+    return lwip_get_gateway();
 }
 
 NetworkStack *EthernetInterface::get_stack()

features/net/FEATURE_IPV4/lwip-interface/EthernetInterface.h

@@ -31,6 +31,32 @@ class NetworkStack;
 class EthernetInterface : public EthInterface
 {
 public:
+    /** EthernetInterface lifetime
+     */
+    EthernetInterface();
+
+    /** Set a static IP address
+     *
+     *  Configures this network interface to use a static IP address.
+     *  Implicitly disables DHCP, which can be enabled in set_dhcp.
+     *  Requires that the network is disconnected.
+     *
+     *  @param address  Null-terminated representation of the local IP address
+     *  @param netmask  Null-terminated representation of the local network mask
+     *  @param gateway  Null-terminated representation of the local gateway
+     *  @return         0 on success, negative error code on failure
+     */
+    virtual int set_network(const char *ip_address, const char *netmask, const char *gateway);
+
+    /** Enable or disable DHCP on the network
+     *
+     *  Requires that the network is disconnected
+     *
+     *  @param dhcp     False to disable dhcp (defaults to enabled)
+     *  @return         0 on success, negative error code on failure
+     */
+    virtual int set_dhcp(bool dhcp);
+
     /** Start the interface
      *  @return             0 on success, negative on failure
      */
@@ -41,22 +67,49 @@ class EthernetInterface : public EthInterface
      */
     virtual int disconnect();
 
-    /** Get the internally stored IP address
-     *  @return             IP address of the interface or null if not yet connected
+    /** Get the local MAC address
+     *
+     *  Provided MAC address is intended for info or debug purposes and
+     *  may not be provided if the underlying network interface does not
+     *  provide a MAC address
+     *  
+     *  @return         Null-terminated representation of the local MAC address
+     *                  or null if no MAC address is available
+     */
+    virtual const char *get_mac_address();
+
+    /** Get the local IP address
+     *
+     *  @return         Null-terminated representation of the local IP address
+     *                  or null if no IP address has been recieved
      */
     virtual const char *get_ip_address();
 
-    /** Get the internally stored MAC address
-     *  @return             MAC address of the interface
+    /** Get the local network mask
+     *
+     *  @return         Null-terminated representation of the local network mask 
+     *                  or null if no network mask has been recieved
+     */
+    virtual const char *get_netmask();
+
+    /** Get the local gateway
+     *
+     *  @return         Null-terminated representation of the local gateway
+     *                  or null if no network mask has been recieved
      */
-    virtual const char *get_mac_address();
+    virtual const char *get_gateway();
 
 protected:
     /** Provide access to the underlying stack
      *
      *  @return The underlying network stack 
      */
     virtual NetworkStack *get_stack();
+
+    bool _dhcp;
+    char _ip_address[NSAPI_IPv4_SIZE];
+    char _netmask[NSAPI_IPv4_SIZE];
+    char _gateway[NSAPI_IPv4_SIZE];
 };
 
 

features/net/FEATURE_IPV4/lwip-interface/lwip_stack.c

@@ -89,9 +89,11 @@ static void lwip_socket_callback(struct netconn *nc, enum netconn_evt eh, u16_t
 
 /* TCP/IP and Network Interface Initialisation */
 static struct netif lwip_netif;
-
-static char lwip_ip_addr[NSAPI_IP_SIZE] = "\0";
-static char lwip_mac_addr[NSAPI_MAC_SIZE] = "\0";
+static bool lwip_dhcp = false;
+static char lwip_mac_address[NSAPI_MAC_SIZE] = "\0";
+static char lwip_ip_address[NSAPI_IPv4_SIZE] = "\0";
+static char lwip_netmask[NSAPI_IPv4_SIZE] = "\0";
+static char lwip_gateway[NSAPI_IPv4_SIZE] = "\0";
 
 static sys_sem_t lwip_tcpip_inited;
 static void lwip_tcpip_init_irq(void *eh)
@@ -111,21 +113,23 @@ static sys_sem_t lwip_netif_up;
 static void lwip_netif_status_irq(struct netif *lwip_netif)
 {
     if (netif_is_up(lwip_netif)) {
-        strcpy(lwip_ip_addr, inet_ntoa(lwip_netif->ip_addr));
+        strcpy(lwip_ip_address, inet_ntoa(lwip_netif->ip_addr));
+        strcpy(lwip_netmask, inet_ntoa(lwip_netif->netmask));
+        strcpy(lwip_gateway, inet_ntoa(lwip_netif->gw));
         sys_sem_signal(&lwip_netif_up);
     }
 }
 
 static void lwip_set_mac_address(void)
 {
 #if (MBED_MAC_ADDRESS_SUM != MBED_MAC_ADDR_INTERFACE)
-    snprintf(lwip_mac_addr, 19, "%02x:%02x:%02x:%02x:%02x:%02x",
+    snprintf(lwip_mac_address, 19, "%02x:%02x:%02x:%02x:%02x:%02x",
             MBED_MAC_ADDR_0, MBED_MAC_ADDR_1, MBED_MAC_ADDR_2,
             MBED_MAC_ADDR_3, MBED_MAC_ADDR_4, MBED_MAC_ADDR_5);
 #else
     char mac[6];
     mbed_mac_address(mac);
-    snprintf(lwip_mac_addr, 19, "%02x:%02x:%02x:%02x:%02x:%02x",
+    snprintf(lwip_mac_address, 19, "%02x:%02x:%02x:%02x:%02x:%02x",
             mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
 #endif
 }
@@ -134,15 +138,26 @@ static void lwip_set_mac_address(void)
 /* LWIP interface implementation */
 const char *lwip_get_mac_address(void)
 {
-    return lwip_mac_addr[0] ? lwip_mac_addr : 0;
+    return lwip_mac_address[0] ? lwip_mac_address : 0;
 }
 
 const char *lwip_get_ip_address(void)
 {
-    return lwip_ip_addr[0] ? lwip_ip_addr : 0;
+    return lwip_ip_address[0] ? lwip_ip_address : 0;
+}
+
+const char *lwip_get_netmask(void)
+{
+    return lwip_netmask[0] ? lwip_netmask : 0;
 }
 
-int lwip_bringup(void)
+const char *lwip_get_gateway(void)
+{
+    return lwip_gateway[0] ? lwip_gateway : 0;
+}
+
+
+int lwip_bringup(bool dhcp, const char *ip, const char *netmask, const char *gw)
 {
     // Check if we've already connected
     if (lwip_get_ip_address()) {
@@ -162,6 +177,7 @@ int lwip_bringup(void)
         sys_arch_sem_wait(&lwip_tcpip_inited, 0);
 
         memset(&lwip_netif, 0, sizeof lwip_netif);
+
         netif_add(&lwip_netif, 0, 0, 0, NULL, eth_arch_enetif_init, tcpip_input);
         netif_set_default(&lwip_netif);
 
@@ -175,7 +191,26 @@ int lwip_bringup(void)
     lwip_arena_init();
 
     // Connect to the network
-    dhcp_start(&lwip_netif);
+    lwip_dhcp = dhcp;
+    if (lwip_dhcp) {
+        err_t err = dhcp_start(&lwip_netif);
+        if (err) {
+            return NSAPI_ERROR_DHCP_FAILURE;
+        }
+    } else {
+        ip_addr_t ip_addr;
+        ip_addr_t netmask_addr;
+        ip_addr_t gw_addr;
+
+        if (!inet_aton(ip, &ip_addr) ||
+            !inet_aton(netmask, &netmask_addr) ||
+            !inet_aton(gw, &gw_addr)) {
+            return NSAPI_ERROR_PARAMETER;
+        }
+
+        netif_set_addr(&lwip_netif, &ip_addr, &netmask_addr, &gw_addr);
+        netif_set_up(&lwip_netif);
+    }
 
     // Wait for an IP Address
     u32_t ret = sys_arch_sem_wait(&lwip_netif_up, 15000);
@@ -194,9 +229,17 @@ int lwip_bringdown(void)
     }
 
     // Disconnect from the network
-    dhcp_release(&lwip_netif);
-    dhcp_stop(&lwip_netif);
-    lwip_ip_addr[0] = '\0';
+    if (lwip_dhcp) {
+        dhcp_release(&lwip_netif);
+        dhcp_stop(&lwip_netif);
+        lwip_dhcp = false;
+
+        lwip_ip_address[0] = '\0';
+        lwip_netmask[0] = '\0';
+        lwip_gateway[0] = '\0';
+    } else {
+        netif_set_down(&lwip_netif);
+    }
 
     return 0;
 }
@@ -230,18 +273,6 @@ static int lwip_err_remap(err_t err) {
 
 
 /* LWIP network stack implementation */
-static nsapi_addr_t lwip_getaddr(nsapi_stack_t *stack)
-{
-    if (!lwip_get_ip_address()) {
-        return (nsapi_addr_t){0};
-    }
-
-    nsapi_addr_t addr;
-    addr.version = NSAPI_IPv4;
-    inet_aton(lwip_get_ip_address(), (ip_addr_t *)addr.bytes);
-    return addr;
-}
-
 static int lwip_gethostbyname(nsapi_stack_t *stack, nsapi_addr_t *addr, const char *host)
 {
     err_t err = netconn_gethostbyname(host, (ip_addr_t *)addr->bytes);
@@ -487,7 +518,6 @@ static void lwip_socket_attach(nsapi_stack_t *stack, nsapi_socket_t handle, void
 
 /* LWIP network stack */
 const nsapi_stack_api_t lwip_stack_api = {
-    .get_ip_address     = lwip_getaddr,
     .gethostbyname      = lwip_gethostbyname,
     .socket_open        = lwip_socket_open,
     .socket_close       = lwip_socket_close,

features/net/FEATURE_IPV4/lwip-interface/lwip_stack.h

@@ -25,13 +25,15 @@ extern "C" {
 
 
 // Access to lwip through the nsapi
-int lwip_bringup(void);
+int lwip_bringup(bool dhcp, const char *ip, const char *netmask, const char *gw);
 int lwip_bringdown(void);
 
-extern nsapi_stack_t lwip_stack;
-
 const char *lwip_get_mac_address(void);
 const char *lwip_get_ip_address(void);
+const char *lwip_get_netmask(void);
+const char *lwip_get_gateway(void);
+
+extern nsapi_stack_t lwip_stack;
 
 
 #ifdef __cplusplus