PPP, PPPoS, added sub-ioctl commands

Allow low level drivers to extend ioctl call, moved PPPoS ioctl
commands to pppos.c.

src/include/netif/ppp/ppp_impl.h

@@ -163,6 +163,8 @@ struct link_callbacks {
   void (*recv_config)(ppp_pcb *pcb, void *ctx, u32_t accm);
   /* configure TCP header compression */
   void (*vj_config)(ppp_pcb *pcb, void *ctx, int vjcomp, int cidcomp, int maxcid);
+  /* Get and set parameters for the given connection. */
+  int (*ioctl)(ppp_pcb *pcb, void *ctx, int cmd, void *arg);
 };
 
 /*

src/include/netif/ppp/pppos.h

@@ -102,7 +102,6 @@ void pppos_input(ppp_pcb *ppp, u_char* data, int len);
  *
  * You may use them if you REALLY know what you are doing.
  */
-sio_fd_t pppos_get_fd(pppos_pcb *pppos);
 int pppos_vjc_comp(pppos_pcb *pppos, struct pbuf *pb);
 int pppos_vjc_uncomp(pppos_pcb *pppos, struct pbuf *pb);
 

src/netif/ppp/ppp.c

@@ -368,18 +368,10 @@ ppp_ioctl(ppp_pcb *pcb, int cmd, void *arg)
       return PPPERR_PARAM;
       break;
 
-#if PPPOS_SUPPORT
-    case PPPCTLG_FD:            /* Get the fd associated with the ppp */
-      if (arg) {
-        *(sio_fd_t *)arg = pppos_get_fd((pppos_pcb*)pcb->link_ctx_cb);
-        return PPPERR_NONE;
-      }
-      return PPPERR_PARAM;
-      break;
-#endif /* PPPOS_SUPPORT */
-
     default:
-      break;
+      if (pcb->link_cb->ioctl) {
+        return pcb->link_cb->ioctl(pcb, pcb->link_ctx_cb, cmd, arg);
+      }
   }
 
   return PPPERR_PARAM;

src/netif/ppp/pppoe.c

@@ -156,6 +156,7 @@ static const struct link_callbacks pppoe_callbacks = {
   pppoe_netif_output,
   NULL,
   NULL,
+  NULL,
   NULL
 };
 

src/netif/ppp/pppol2tp.c

@@ -105,6 +105,7 @@ static const struct link_callbacks pppol2tp_callbacks = {
   pppol2tp_netif_output,
   NULL,
   NULL,
+  NULL,
   NULL
 };
 

src/netif/ppp/pppos.c

@@ -89,6 +89,7 @@ static void pppos_disconnect(ppp_pcb *ppp, void *ctx);
 static err_t pppos_destroy(ppp_pcb *ppp, void *ctx);
 static void pppos_send_config(ppp_pcb *ppp, void *ctx, u32_t accm);
 static void pppos_recv_config(ppp_pcb *ppp, void *ctx, u32_t accm);
+static int pppos_ioctl(ppp_pcb *pcb, void *ctx, int cmd, void *arg);
 #if VJ_SUPPORT
 static void pppos_vjc_config(ppp_pcb *ppp, void *ctx, int vjcomp, int cidcomp, int maxcid);
 #endif /* VJ_SUPPORT */
@@ -112,10 +113,11 @@ static const struct link_callbacks pppos_callbacks = {
   pppos_send_config,
   pppos_recv_config,
 #if VJ_SUPPORT
-  pppos_vjc_config
+  pppos_vjc_config,
 #else /* VJ_SUPPORT */
-  NULL
+  NULL,
 #endif /* VJ_SUPPORT */
+  pppos_ioctl
 };
 
 /* PPP's Asynchronous-Control-Character-Map.  The mask array is used
@@ -809,13 +811,25 @@ pppos_recv_config(ppp_pcb *ppp, void *ctx, u32_t accm)
             pppos->in_accm[0], pppos->in_accm[1], pppos->in_accm[2], pppos->in_accm[3]));
 }
 
-sio_fd_t
-pppos_get_fd(pppos_pcb *pppos)
+static int
+pppos_ioctl(ppp_pcb *pcb, void *ctx, int cmd, void *arg)
 {
-  if (!pppos_exist(pppos)) {
-    return 0;
+  pppos_pcb *pppos = (pppos_pcb *)ctx;
+  LWIP_UNUSED_ARG(pcb);
+
+  switch(cmd) {
+    case PPPCTLG_FD:            /* Get the fd associated with the ppp */
+      if (!arg) {
+        goto fail;
+      }
+      *(sio_fd_t *)arg = pppos->fd;
+      return PPPERR_NONE;
+
+    default: ;
   }
-  return pppos->fd;
+
+fail:
+  return PPPERR_PARAM;
 }
 
 #if VJ_SUPPORT