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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>
typedef struct
{
u8 *data;
} vnet_netlink_msg_t;
void
vnet_netlink_msg_init (vnet_netlink_msg_t * m, u16 type, u16 flags,
void *msg_data, int msg_len)
{
struct nlmsghdr *nh;
u8 *p;
int len = NLMSG_LENGTH (msg_len);
memset (m, 0, sizeof (vnet_netlink_msg_t));
vec_add2 (m->data, p, len);
ASSERT (m->data == p);
nh = (struct nlmsghdr *) p;
nh->nlmsg_flags = flags;
nh->nlmsg_type = type;
clib_memcpy (m->data + sizeof (struct nlmsghdr), msg_data, msg_len);
}
static void
vnet_netlink_msg_add_rtattr (vnet_netlink_msg_t * m, u16 rta_type,
void *rta_data, int rta_data_len)
{
struct rtattr *rta;
u8 *p;
vec_add2 (m->data, p, RTA_LENGTH (rta_data_len));
rta = (struct rtattr *) p;
rta->rta_type = rta_type;
rta->rta_len = RTA_LENGTH (rta_data_len);
clib_memcpy (RTA_DATA (rta), rta_data, rta_data_len);
}
static clib_error_t *
vnet_netlink_msg_send (vnet_netlink_msg_t * m)
{
clib_error_t *err = 0;
struct sockaddr_nl ra = { 0 };
int sock;
struct nlmsghdr *nh = (struct nlmsghdr *) m->data;
nh->nlmsg_len = vec_len (m->data);
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;
}
if ((send (sock, m->data, vec_len (m->data), 0)) == -1)
err = clib_error_return_unix (0, "send");
error:
close (sock);
vec_free (m->data);
return err;
}
clib_error_t *
vnet_netlink_set_if_namespace (int ifindex, char *net_ns)
{
vnet_netlink_msg_t m;
struct ifinfomsg ifmsg = { 0 };
clib_error_t *err;
int data;
u16 type;
u8 *s;
if (strncmp (net_ns, "pid:", 4) == 0)
{
data = atoi (net_ns + 4);
type = IFLA_NET_NS_PID;
}
else
{
if (net_ns[0] == '/')
s = format (0, "%s%c", net_ns, 0);
else
s = format (0, "/var/run/netns/%s%c", net_ns, 0);
data = open ((char *) s, O_RDONLY);
type = IFLA_NET_NS_FD;
vec_free (s);
if (data == -1)
return clib_error_return (0, "namespace '%s' doesn't exist", net_ns);
}
ifmsg.ifi_family = AF_UNSPEC;
ifmsg.ifi_index = ifindex;
ifmsg.ifi_change = 0xffffffff;
vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST,
&ifmsg, sizeof (struct ifinfomsg));
vnet_netlink_msg_add_rtattr (&m, type, &data, sizeof (int));
err = vnet_netlink_msg_send (&m);
if (type == IFLA_NET_NS_FD)
close (data);
return err;
}
clib_error_t *
vnet_netlink_set_if_master (int ifindex, int master_ifindex)
{
vnet_netlink_msg_t m;
struct ifinfomsg ifmsg = { 0 };
ifmsg.ifi_family = AF_UNSPEC;
ifmsg.ifi_index = ifindex;
ifmsg.ifi_change = 0xffffffff;
vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST,
&ifmsg, sizeof (struct ifinfomsg));
vnet_netlink_msg_add_rtattr (&m, IFLA_MASTER, &master_ifindex,
sizeof (int));
return vnet_netlink_msg_send (&m);
}
clib_error_t *
vnet_netlink_set_if_mtu (int ifindex, int mtu)
{
vnet_netlink_msg_t m;
struct ifinfomsg ifmsg = { 0 };
ifmsg.ifi_family = AF_UNSPEC;
ifmsg.ifi_index = ifindex;
ifmsg.ifi_change = 0xffffffff;
vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST,
&ifmsg, sizeof (struct ifinfomsg));
vnet_netlink_msg_add_rtattr (&m, IFLA_MTU, &mtu, sizeof (int));
return vnet_netlink_msg_send (&m);
}
clib_error_t *
vnet_netlink_add_ip4_addr (int ifindex, void *addr, int pfx_len)
{
vnet_netlink_msg_t m;
struct ifaddrmsg ifa = { 0 };
ifa.ifa_family = AF_INET;
ifa.ifa_prefixlen = pfx_len;
ifa.ifa_index = ifindex;
vnet_netlink_msg_init (&m, RTM_NEWADDR,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL,
&ifa, sizeof (struct ifaddrmsg));
vnet_netlink_msg_add_rtattr (&m, IFA_LOCAL, addr, 4);
vnet_netlink_msg_add_rtattr (&m, IFA_ADDRESS, addr, 4);
return vnet_netlink_msg_send (&m);
}
clib_error_t *
vnet_netlink_add_ip6_addr (int ifindex, void *addr, int pfx_len)
{
vnet_netlink_msg_t m;
struct ifaddrmsg ifa = { 0 };
ifa.ifa_family = AF_INET6;
ifa.ifa_prefixlen = pfx_len;
ifa.ifa_index = ifindex;
vnet_netlink_msg_init (&m, RTM_NEWADDR,
NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL,
&ifa, sizeof (struct ifaddrmsg));
vnet_netlink_msg_add_rtattr (&m, IFA_LOCAL, addr, 16);
vnet_netlink_msg_add_rtattr (&m, IFA_ADDRESS, addr, 16);
return vnet_netlink_msg_send (&m);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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