1 files changed, 114 insertions, 0 deletions
diff --git a/src/vnet/devices/netlink.c b/src/vnet/devices/netlink.c
new file mode 100644
index 00000000000..b2a651348a3
--- /dev/null
+++ b/src/vnet/devices/netlink.c
@@ -0,0 +1,114 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * 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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+#include <sys/ioctl.h>
+#include <linux/virtio_net.h>
+#include <linux/vhost.h>
+#include <sys/eventfd.h>
+
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+
+clib_error_t *
+vnet_netlink_set_if_attr (int ifindex, unsigned short rta_type, void *data,
+			  int data_len)
+{
+  clib_error_t *err = 0;
+  int sock;
+  struct sockaddr_nl ra = { 0 };
+  struct
+  {
+    struct nlmsghdr nh;
+    struct ifinfomsg ifmsg;
+    char attrbuf[512];
+  } req;
+  struct rtattr *rta;
+
+  memset (&req, 0, sizeof (req));
+  if ((sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) == -1)
+    {
+      err = clib_error_return_unix (0, "socket(AF_NETLINK)");
+      goto error;
+    }
+
+  ra.nl_family = AF_NETLINK;
+  ra.nl_pid = getpid ();
+
+  if ((bind (sock, (struct sockaddr *) &ra, sizeof (ra))) == -1)
+    return clib_error_return_unix (0, "bind");
+
+  req.nh.nlmsg_len = NLMSG_LENGTH (sizeof (struct ifinfomsg));
+  req.nh.nlmsg_flags = NLM_F_REQUEST;
+  req.nh.nlmsg_type = RTM_SETLINK;
+  req.ifmsg.ifi_family = AF_UNSPEC;
+  req.ifmsg.ifi_index = ifindex;
+  req.ifmsg.ifi_change = 0xffffffff;
+  rta = (struct rtattr *) (((char *) &req) + NLMSG_ALIGN (req.nh.nlmsg_len));
+  rta->rta_type = rta_type;
+  rta->rta_len = RTA_LENGTH (data_len);
+  req.nh.nlmsg_len = NLMSG_ALIGN (req.nh.nlmsg_len) + RTA_LENGTH (data_len);
+  memcpy (RTA_DATA (rta), data, data_len);
+
+  if ((send (sock, &req, req.nh.nlmsg_len, 0)) == -1)
+    err = clib_error_return_unix (0, "send");
+
+error:
+  return err;
+}
+
+clib_error_t *
+vnet_netlink_set_if_mtu (int ifindex, int mtu)
+{
+  clib_error_t *err;
+
+  err = vnet_netlink_set_if_attr (ifindex, IFLA_MTU, &mtu, sizeof (int));
+  return err;
+}
+
+clib_error_t *
+vnet_netlink_set_if_namespace (int ifindex, char *net_ns)
+{
+  clib_error_t *err;
+  int ns_fd;
+  u8 *s;
+  s = format (0, "/var/run/netns/%s%c", net_ns, 0);
+  ns_fd = open ((char *) s, O_RDONLY);
+  vec_free (s);
+  if (ns_fd == -1)
+    return clib_error_return (0, "namespace '%s' doesn't exist", net_ns);
+
+  err =
+    vnet_netlink_set_if_attr (ifindex, IFLA_NET_NS_FD, &ns_fd, sizeof (int));
+  close (ns_fd);
+  return err;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */