1 files changed, 170 insertions, 0 deletions
diff --git a/utils/extras/rtinject/tap_inject_tap.c b/utils/extras/rtinject/tap_inject_tap.c
new file mode 100644
index 000000000..a3ec9ffef
--- /dev/null
+++ b/utils/extras/rtinject/tap_inject_tap.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright 2016 Intel Corporation
+ *
+ * Licensed 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.
+ */
+
+#include "tap_inject.h"
+
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/if_tun.h>
+#include <netinet/in.h>
+#include <vnet/unix/tuntap.h>
+
+#include <vlib/unix/unix.h>
+
+
+static clib_error_t *
+tap_inject_tap_read (clib_file_t * f)
+{
+  vlib_main_t * vm = vlib_get_main ();
+  tap_inject_main_t * im = tap_inject_get_main ();
+
+  vec_add1 (im->rx_file_descriptors, f->file_descriptor);
+
+  vlib_node_set_interrupt_pending (vm, im->rx_node_index);
+
+  return 0;
+}
+
+#define TAP_INJECT_TAP_BASE_NAME "vpp"
+
+clib_error_t *
+tap_inject_tap_connect (vnet_hw_interface_t * hw)
+{
+  vnet_main_t * vnet_main = vnet_get_main ();
+  vnet_sw_interface_t * sw = vnet_get_sw_interface (vnet_main, hw->hw_if_index);
+  static const int one = 1;
+  int fd;
+  struct ifreq ifr;
+  clib_file_t template;
+  u32 tap_fd;
+  u8 * name;
+
+  memset (&ifr, 0, sizeof (ifr));
+  memset (&template, 0, sizeof (template));
+
+  ASSERT (hw->hw_if_index == sw->sw_if_index);
+
+  /* Create the tap. */
+  tap_fd = open ("/dev/net/tun", O_RDWR);
+
+  if ((int)tap_fd < 0)
+    return clib_error_return (0, "failed to open tun device");
+
+  name = format (0, TAP_INJECT_TAP_BASE_NAME "%u%c", hw->hw_instance, 0);
+
+  strncpy (ifr.ifr_name, (char *) name, sizeof (ifr.ifr_name) - 1);
+  ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+
+  if (ioctl (tap_fd, TUNSETIFF, (void *)&ifr) < 0)
+    {
+      close (tap_fd);
+      return clib_error_return (0, "failed to create tap");
+    }
+
+  if (ioctl (tap_fd, FIONBIO, &one) < 0)
+    {
+      close (tap_fd);
+      return clib_error_return (0, "failed to set tap to non-blocking io");
+    }
+
+  /* Open a socket to configure the device. */
+  fd = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL));
+
+  if (fd < 0)
+    {
+      close (tap_fd);
+      return clib_error_return (0, "failed to configure tap");
+    }
+
+  if (hw->hw_address)
+    clib_memcpy (ifr.ifr_hwaddr.sa_data, hw->hw_address, ETHER_ADDR_LEN);
+
+  ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
+
+  /* Set the hardware address. */
+  if (ioctl (fd, SIOCSIFHWADDR, &ifr) < 0)
+    {
+      close (tap_fd);
+      close (fd);
+      return clib_error_return (0, "failed to set tap hardware address");
+    }
+
+  /* Get the tap if index. */
+  if (ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
+    {
+      close (tap_fd);
+      close (fd);
+      return clib_error_return (0, "failed to procure tap if index");
+    }
+
+  close (fd);
+
+  /* Get notified when the tap needs to be read. */
+  template.read_function = tap_inject_tap_read;
+  template.file_descriptor = tap_fd;
+
+  clib_file_add (&file_main, &template);
+
+  tap_inject_insert_tap (sw->sw_if_index, tap_fd, ifr.ifr_ifindex);
+
+  return 0;
+}
+
+clib_error_t *
+tap_inject_tap_disconnect (u32 sw_if_index)
+{
+  u32 tap_fd;
+
+  tap_fd = tap_inject_lookup_tap_fd (sw_if_index);
+  if (tap_fd == ~0)
+    return clib_error_return (0, "failed to disconnect tap");
+
+  tap_inject_delete_tap (sw_if_index);
+
+  close (tap_fd);
+  return 0;
+}
+
+
+u8 *
+format_tap_inject_tap_name (u8 * s, va_list * args)
+{
+  int fd;
+  struct ifreq ifr;
+
+  fd = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL));
+
+  if (fd < 0)
+    return 0;
+
+  memset (&ifr, 0, sizeof (ifr));
+
+  ifr.ifr_ifindex = va_arg (*args, u32);
+
+  if (ioctl (fd, SIOCGIFNAME, &ifr) < 0)
+    {
+      close (fd);
+      return 0;
+    }
+
+  close (fd);
+
+  return format (s, "%s", ifr.ifr_name);
+}