1 files changed, 121 insertions, 0 deletions
diff --git a/lwip/port/netif/ifcommon.c b/lwip/port/netif/ifcommon.c
new file mode 100644
index 00000000..11ede76d
--- /dev/null
+++ b/lwip/port/netif/ifcommon.c
@@ -0,0 +1,121 @@
+/*
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   Written by Joan Lledó.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* Common interface for all kinds of devices */
+
+#include <netif/ifcommon.h>
+
+#include <net/if.h>
+
+#include <lwip/netifapi.h>
+
+/* Open the device and set the interface up */
+static error_t
+if_open (struct netif *netif)
+{
+  error_t err = 0;
+  struct ifcommon *ifc = netif_get_state (netif);
+
+  if (ifc->open)
+    err = ifc->open (netif);
+  if (!err)
+    {
+      /* Up the inerface */
+      ifc->flags |= IFF_UP | IFF_RUNNING;
+      netifapi_netif_set_up (netif);
+    }
+
+  return err;
+}
+
+/* Close the device and set the interface down */
+static error_t
+if_close (struct netif *netif)
+{
+  error_t err = 0;
+  struct ifcommon *ifc = netif_get_state (netif);
+
+  if (ifc->close)
+    err = ifc->close (netif);
+  if (!err)
+    {
+      /* Down the inerface */
+      ifc->flags &= ~(IFF_UP | IFF_RUNNING);
+      netifapi_netif_set_down (netif);
+    }
+
+  return err;
+}
+
+/*
+ * Common initialization callback for all kinds of devices.
+ *
+ * This function doesn't assume there's a device nor tries to open it.
+ * If a device is present, it must be opened from the ifc->init() callback.
+ */
+error_t
+if_init (struct netif * netif)
+{
+  struct ifcommon *ifc = netif_get_state (netif);
+
+  if (netif == NULL)
+    /* The user provided no interface */
+    return -1;
+
+  return ifc->init (netif);
+}
+
+/* Tries to close the device and frees allocated resources */
+error_t
+if_terminate (struct netif * netif)
+{
+  error_t err;
+  struct ifcommon *ifc = netif_get_state (netif);
+
+  if (netif == NULL)
+    /* The user provided no interface */
+    return -1;
+
+  err = if_close (netif);
+  if (err)
+    return err;
+
+  return ifc->terminate (netif);
+}
+
+/*
+ * Change device flags.
+ *
+ * If IFF_UP changes, it opens/closes the device accordingly.
+ */
+error_t
+if_change_flags (struct netif * netif, uint16_t flags)
+{
+  error_t err;
+  struct ifcommon *ifc = netif_get_state (netif);
+  uint16_t oldflags = ifc->flags;
+
+  err = ifc->change_flags (netif, flags);
+
+  if ((oldflags ^ flags) & IFF_UP)	/* Bit is different  ? */
+    ((oldflags & IFF_UP) ? if_close : if_open) (netif);
+
+  return err;
+}