opt.h, tcpip.h, tcpip.c, netifapi.h, netifapi.c: New configuration option LWIP_NETIF_API allow to use thread-safe functions to add/remove netif in list, and to start/stop dhcp clients, using new functions from netifapi.h. Disable as default (no port change to do).

src/api/netifapi.c

@@ -0,0 +1,118 @@
+/*
+ * Redistribution and use in source and binary forms, with or without modification, 
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ * 
+ */
+
+#include "lwip/opt.h"
+#include "lwip/arch.h"
+#include "lwip/netifapi.h"
+#include "lwip/tcpip.h"
+
+#if LWIP_NETIF_API
+
+err_t
+netifapi_netif_add( struct netif *netif,
+                    struct ip_addr *ipaddr,
+                    struct ip_addr *netmask,
+                    struct ip_addr *gw,
+                    void *state,
+                    err_t (* init)(struct netif *netif),
+                    err_t (* input)(struct pbuf *p, struct netif *netif) )
+{ struct netifapi_msg msg;
+  msg.type  = NETIFAPI_MSG_NETIF_ADD;
+  msg.netif = netif;  
+  msg.msg.add.ipaddr  = ipaddr;
+  msg.msg.add.netmask = netmask;
+  msg.msg.add.gw      = gw;
+  msg.msg.add.state   = state;
+  msg.msg.add.init    = init;
+  msg.msg.add.input   = input;
+  netifapi_msg_post(&msg);
+  return msg.err;
+}
+
+err_t
+netifapi_netif_remove( struct netif *netif)
+{ struct netifapi_msg msg;
+  msg.type  = NETIFAPI_MSG_NETIF_REMOVE;
+  msg.netif = netif;  
+  netifapi_msg_post(&msg);
+  return msg.err;
+}
+
+err_t
+netifapi_dhcp_start( struct netif *netif)
+{ struct netifapi_msg msg;
+  msg.type  = NETIFAPI_MSG_DHCP_START;
+  msg.netif = netif;  
+  netifapi_msg_post(&msg);
+  return msg.err;
+}
+
+err_t
+netifapi_dhcp_stop( struct netif *netif)
+{ struct netifapi_msg msg;
+  msg.type  = NETIFAPI_MSG_DHCP_STOP;
+  msg.netif = netif;  
+  netifapi_msg_post(&msg);
+  return msg.err;
+}
+
+void
+netifapi_msg_input( struct netifapi_msg *msg)
+{ msg->err = ERR_OK;
+  switch (msg->type) {
+    case NETIFAPI_MSG_NETIF_ADD: {
+      if (!netif_add( msg->netif,
+                      msg->msg.add.ipaddr,
+                      msg->msg.add.netmask,
+                      msg->msg.add.gw,
+                      msg->msg.add.state,
+                      msg->msg.add.init,
+                      msg->msg.add.input))
+        msg->err = ERR_IF;
+      break;
+    }
+    case NETIFAPI_MSG_NETIF_REMOVE:
+      netif_remove(msg->netif);
+      break;
+#if LWIP_DHCP    
+    case NETIFAPI_MSG_DHCP_START:
+      msg->err = dhcp_start(msg->netif);
+      break;
+    case NETIFAPI_MSG_DHCP_STOP:
+      dhcp_stop(msg->netif);
+      break;
+#endif /* LWIP_DHCP */
+  }
+ sys_sem_signal(msg->sem);
+}
+
+err_t
+netifapi_msg_post( struct netifapi_msg *msg)
+{ return tcpip_netifapi(msg);
+}
+
+#endif /* LWIP_NETIF_API */

src/api/tcpip.c

@@ -198,6 +198,7 @@ tcpip_thread(void *arg)
     case TCPIP_MSG_INPUT:
       LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: IP packet %p\n", (void *)msg));
       ip_input(msg->msg.inp.p, msg->msg.inp.netif);
+      memp_free(MEMP_TCPIP_MSG, msg);
       break;
 #endif /* ETHARP_TCPIP_INPUT */
 
@@ -205,20 +206,25 @@ tcpip_thread(void *arg)
     case TCPIP_MSG_ETHINPUT:
       LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Ethernet packet %p\n", (void *)msg));
       ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
+      memp_free(MEMP_TCPIP_MSG, msg);
       break;
 #endif /* ETHARP_TCPIP_ETHINPUT */
 
+#if LWIP_NETIF_API
+    case TCPIP_MSG_NETIFAPI:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
+      netifapi_msg_input(msg->msg.netifapimsg);
+      break;
+#endif /* LWIP_NETIF_API */
+
     case TCPIP_MSG_CALLBACK:
       LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
       msg->msg.cb.f(msg->msg.cb.ctx);
+      memp_free(MEMP_TCPIP_MSG, msg);
       break;
     default:
       break;
     }
-    
-    if (msg->type!=TCPIP_MSG_API) {
-      memp_free(MEMP_TCPIP_MSG, msg);
-    }
   }
 }
 
@@ -303,6 +309,29 @@ tcpip_apimsg(struct api_msg *apimsg)
   return ERR_VAL;
 }
 
+#if LWIP_NETIF_API
+err_t tcpip_netifapi(struct netifapi_msg* netifapimsg)
+{
+  struct tcpip_msg msg;
+  
+  if (mbox != SYS_MBOX_NULL) {
+    netifapimsg->sem = sys_sem_new(0);      
+    if (netifapimsg->sem == SYS_SEM_NULL) {
+      netifapimsg->err = ERR_MEM;
+      return netifapimsg->err;
+    }  
+      
+    msg.type = TCPIP_MSG_NETIFAPI;
+    msg.msg.netifapimsg = netifapimsg;
+    sys_mbox_post(mbox, &msg);
+    sys_sem_wait(netifapimsg->sem);
+    sys_sem_free(netifapimsg->sem);    
+    return netifapimsg->err;
+  }
+  return ERR_VAL;
+}
+#endif /* LWIP_NETIF_API */
+
 void
 tcpip_init(void (* initfunc)(void *), void *arg)
 {