itf: Fix admin up down for AF_PACKET and vhost-user

Change-Id: I84327197d59c72d0d046dd2cb4071bf74af6fc28
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

3 files changed, 50 insertions, 12 deletions

diff --git a/src/vnet/devices/af_packet/af_packet.c b/src/vnet/devices/af_packet/af_packet.c
index 46bb42a4f47..500460126a8 100644
--- a/src/vnet/devices/af_packet/af_packet.c
+++ b/src/vnet/devices/af_packet/af_packet.c
@@ -19,6 +19,8 @@
 
 #include <linux/if_ether.h>
 #include <linux/if_packet.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
 #include <dirent.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -212,9 +214,10 @@ af_packet_create_if (vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set,
 		     u32 * sw_if_index)
 {
   af_packet_main_t *apm = &af_packet_main;
-  int ret, fd = -1;
+  int ret, fd = -1, fd2 = -1;
   struct tpacket_req *rx_req = 0;
   struct tpacket_req *tx_req = 0;
+  struct ifreq ifr;
   u8 *ring = 0;
   af_packet_if_t *apif = 0;
   u8 hw_addr[6];
@@ -248,14 +251,46 @@ af_packet_create_if (vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set,
   tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
   tx_req->tp_frame_nr = AF_PACKET_TX_FRAME_NR;
 
-  host_if_index = if_nametoindex ((const char *) host_if_name);
+  /*
+   * make sure host side of interface is 'UP' before binding AF_PACKET
+   * socket on it.
+   */
+  if ((fd2 = socket (AF_UNIX, SOCK_DGRAM, 0)) < 0)
+    {
+      DBG_SOCK ("Failed to create socket");
+      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
+      goto error;
+    }
 
-  if (!host_if_index)
+  clib_memcpy (ifr.ifr_name, (const char *) host_if_name,
+	       vec_len (host_if_name));
+  if ((ret = ioctl (fd2, SIOCGIFINDEX, &ifr)) < 0)
     {
-      DBG_SOCK ("Wrong host interface name");
+      clib_unix_warning ("af_packet_create error: %d", ret);
+      close (fd2);
       return VNET_API_ERROR_INVALID_INTERFACE;
     }
 
+  host_if_index = ifr.ifr_ifindex;
+  if ((ret = ioctl (fd2, SIOCGIFFLAGS, &ifr)) < 0)
+    {
+      clib_unix_warning ("af_packet_create error: %d", ret);
+      goto error;
+    }
+
+  if (!(ifr.ifr_flags & IFF_UP))
+    {
+      ifr.ifr_flags |= IFF_UP;
+      if ((ret = ioctl (fd2, SIOCSIFFLAGS, &ifr)) < 0)
+	{
+	  clib_unix_warning ("af_packet_create error: %d", ret);
+	  goto error;
+	}
+    }
+
+  if (fd2 > -1)
+    close (fd2);
+
   ret = create_packet_v2_sock (host_if_index, rx_req, tx_req, &fd, &ring);
 
   if (ret != 0)
@@ -347,6 +382,8 @@ af_packet_create_if (vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set,
   return 0;
 
 error:
+  if (fd2 > -1)
+    close (fd2);
   vec_free (host_if_name_dup);
   vec_free (rx_req);
   vec_free (tx_req);
diff --git a/src/vnet/devices/virtio/vhost-user.c b/src/vnet/devices/virtio/vhost-user.c
index 7e10a60f5fb..4e745d662fb 100644
--- a/src/vnet/devices/virtio/vhost-user.c
+++ b/src/vnet/devices/virtio/vhost-user.c
@@ -2548,16 +2548,14 @@ vhost_user_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
 				    u32 flags)
 {
   vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index);
-  uword is_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
   vhost_user_main_t *vum = &vhost_user_main;
   vhost_user_intf_t *vui =
     pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance);
+  u32 hw_flags = 0;
+  vui->admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
+  hw_flags = vui->admin_up ? VNET_HW_INTERFACE_FLAG_LINK_UP : 0;
 
-  vui->admin_up = is_up;
-
-  if (is_up && vui->is_up)
-    vnet_hw_interface_set_flags (vnm, vui->hw_if_index,
-				 VNET_HW_INTERFACE_FLAG_LINK_UP);
+  vnet_hw_interface_set_flags (vnm, vui->hw_if_index, hw_flags);
 
   return /* no error */ 0;
 }
diff --git a/src/vnet/interface.c b/src/vnet/interface.c
index 36793f1177e..d85d864839e 100644
--- a/src/vnet/interface.c
+++ b/src/vnet/interface.c
@@ -485,10 +485,13 @@ vnet_sw_interface_set_flags_helper (vnet_main_t * vnm, u32 sw_if_index,
 	error = call_elf_section_interface_callbacks
 	  (vnm, sw_if_index, flags,
 	   vnm->sw_interface_admin_up_down_functions);
-      si->flags = old_flags;
 
       if (error)
-	goto done;
+	{
+	  /* restore flags on error */
+	  si->flags = old_flags;
+	  goto done;
+	}
 
       if (si->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
 	{