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/*
*------------------------------------------------------------------
* 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)
return clib_error_return_unix (0, "socket(AF_NETLINK)");
ra.nl_family = AF_NETLINK;
ra.nl_pid = getpid ();
if ((bind (sock, (struct sockaddr *) &ra, sizeof (ra))) == -1)
{
err = clib_error_return_unix (0, "bind");
goto error;
}
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:
close (sock);
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:
*/
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