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-rw-r--r--src/vnet/devices/netlink.c114
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:
+ */