blob: f31548cbbece0aeff725f4ec7a611304ac2b0730 [file] [log] [blame]
/*
*------------------------------------------------------------------
* 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.
*------------------------------------------------------------------
*/
#define _GNU_SOURCE
#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 <sched.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/devices/netlink.h>
#include <vnet/devices/virtio/virtio.h>
#include <vnet/devices/tap/tap.h>
tap_main_t tap_main;
#define _IOCTL(fd,a,...) \
if (ioctl (fd, a, __VA_ARGS__) < 0) \
{ \
err = clib_error_return_unix (0, "ioctl(" #a ")"); \
goto error; \
}
static u32
virtio_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
u32 flags)
{
/* nothing for now */
//TODO On MTU change call vnet_netlink_set_if_mtu
return 0;
}
static int
open_netns_fd (char *netns)
{
u8 *s = 0;
int fd;
if (strncmp (netns, "pid:", 4) == 0)
s = format (0, "/proc/%u/ns/net%c", atoi (netns + 4), 0);
else if (netns[0] == '/')
s = format (0, "%s%c", netns, 0);
else
s = format (0, "/var/run/netns/%s%c", netns, 0);
fd = open ((char *) s, O_RDONLY);
vec_free (s);
return fd;
}
void
tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
{
vnet_main_t *vnm = vnet_get_main ();
virtio_main_t *vim = &virtio_main;
tap_main_t *tm = &tap_main;
vnet_sw_interface_t *sw;
vnet_hw_interface_t *hw;
int i, fd = -1;
int old_netns_fd = -1;
struct ifreq ifr;
size_t hdrsz;
struct vhost_memory *vhost_mem = 0;
virtio_if_t *vif = 0;
clib_error_t *err = 0;
uword *p;
if (args->id != ~0)
{
p = hash_get (tm->dev_instance_by_interface_id, args->id);
if (p)
{
args->rv = VNET_API_ERROR_INVALID_INTERFACE;
args->error = clib_error_return (0, "interface already exists");
return;
}
}
else
{
int tries = 1000;
while (--tries)
{
args->id = tm->last_used_interface_id++;
p = hash_get (tm->dev_instance_by_interface_id, args->id);
if (!p)
break;
}
if (!tries)
{
args->rv = VNET_API_ERROR_UNSPECIFIED;
args->error =
clib_error_return (0, "cannot find free interface id");
return;
}
}
memset (&ifr, 0, sizeof (ifr));
pool_get (vim->interfaces, vif);
vif->dev_instance = vif - vim->interfaces;
vif->tap_fd = -1;
vif->id = args->id;
hash_set (tm->dev_instance_by_interface_id, vif->id, vif->dev_instance);
if ((vif->fd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
{
args->rv = VNET_API_ERROR_SYSCALL_ERROR_1;
args->error = clib_error_return_unix (0, "open '/dev/vhost-net'");
goto error;
}
_IOCTL (vif->fd, VHOST_GET_FEATURES, &vif->remote_features);
if ((vif->remote_features & (1ULL << VIRTIO_NET_F_MRG_RXBUF)) == 0)
{
args->rv = VNET_API_ERROR_UNSUPPORTED;
args->error = clib_error_return (0, "vhost-net backend doesn't support "
"VIRTIO_NET_F_MRG_RXBUF feature");
goto error;
}
if ((vif->remote_features & (1ULL << VIRTIO_RING_F_INDIRECT_DESC)) == 0)
{
args->rv = VNET_API_ERROR_UNSUPPORTED;
args->error = clib_error_return (0, "vhost-net backend doesn't support "
"VIRTIO_RING_F_INDIRECT_DESC feature");
goto error;
}
if ((vif->remote_features & (1ULL << VIRTIO_F_VERSION_1)) == 0)
{
args->rv = VNET_API_ERROR_UNSUPPORTED;
args->error = clib_error_return (0, "vhost-net backend doesn't support "
"VIRTIO_F_VERSION_1 features");
goto error;
}
vif->features |= 1ULL << VIRTIO_NET_F_MRG_RXBUF;
vif->features |= 1ULL << VIRTIO_F_VERSION_1;
vif->features |= 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
_IOCTL (vif->fd, VHOST_SET_FEATURES, &vif->features);
if ((vif->tap_fd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
{
args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
goto error;
}
ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR;
_IOCTL (vif->tap_fd, TUNSETIFF, (void *) &ifr);
vif->ifindex = if_nametoindex (ifr.ifr_ifrn.ifrn_name);
unsigned int offload = 0;
hdrsz = sizeof (struct virtio_net_hdr_v1);
_IOCTL (vif->tap_fd, TUNSETOFFLOAD, offload);
_IOCTL (vif->tap_fd, TUNSETVNETHDRSZ, &hdrsz);
_IOCTL (vif->fd, VHOST_SET_OWNER, 0);
/* if namespace is specified, all further netlink messages should be excuted
after we change our net namespace */
if (args->host_namespace)
{
int fd;
old_netns_fd = open ("/proc/self/ns/net", O_RDONLY);
if ((fd = open_netns_fd ((char *) args->host_namespace)) == -1)
{
args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
args->error = clib_error_return_unix (0, "open_netns_fd '%s'",
args->host_namespace);
goto error;
}
args->error = vnet_netlink_set_link_netns (vif->ifindex, fd,
(char *) args->host_if_name);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
goto error;
}
if (setns (fd, CLONE_NEWNET) == -1)
{
args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
args->error = clib_error_return_unix (0, "setns '%s'",
args->host_namespace);
goto error;
}
close (fd);
if ((vif->ifindex = if_nametoindex ((char *) args->host_if_name)) == 0)
{
args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
args->error = clib_error_return_unix (0, "if_nametoindex '%s'",
args->host_if_name);
goto error;
}
}
else
{
if (args->host_if_name)
{
args->error = vnet_netlink_set_link_name (vif->ifindex,
(char *)
args->host_if_name);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
goto error;
}
}
}
if (!ethernet_mac_address_is_zero (args->host_mac_addr))
{
args->error = vnet_netlink_set_link_addr (vif->ifindex,
args->host_mac_addr);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
goto error;
}
}
if (args->host_bridge)
{
args->error = vnet_netlink_set_link_master (vif->ifindex,
(char *) args->host_bridge);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
goto error;
}
}
if (args->host_ip4_prefix_len)
{
args->error = vnet_netlink_add_ip4_addr (vif->ifindex,
&args->host_ip4_addr,
args->host_ip4_prefix_len);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
goto error;
}
}
if (args->host_ip6_prefix_len)
{
args->error = vnet_netlink_add_ip6_addr (vif->ifindex,
&args->host_ip6_addr,
args->host_ip6_prefix_len);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
goto error;
}
}
args->error = vnet_netlink_set_link_state (vif->ifindex, 1 /* UP */ );
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
goto error;
}
/* switch back to old net namespace */
if (args->host_namespace)
{
if (setns (old_netns_fd, CLONE_NEWNET) == -1)
{
args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
args->error = clib_error_return_unix (0, "setns '%s'",
args->host_namespace);
goto error;
}
}
/* Set vhost memory table */
i = sizeof (struct vhost_memory) + sizeof (struct vhost_memory_region);
vhost_mem = clib_mem_alloc (i);
memset (vhost_mem, 0, i);
vhost_mem->nregions = 1;
vhost_mem->regions[0].memory_size = (1ULL << 47) - 4096;
_IOCTL (vif->fd, VHOST_SET_MEM_TABLE, vhost_mem);
if ((args->error = virtio_vring_init (vm, vif, 0, args->rx_ring_sz)))
{
args->rv = VNET_API_ERROR_INIT_FAILED;
goto error;
}
if ((args->error = virtio_vring_init (vm, vif, 1, args->tx_ring_sz)))
{
args->rv = VNET_API_ERROR_INIT_FAILED;
goto error;
}
if (!args->mac_addr_set)
{
f64 now = vlib_time_now (vm);
u32 rnd;
rnd = (u32) (now * 1e6);
rnd = random_u32 (&rnd);
memcpy (args->mac_addr + 2, &rnd, sizeof (rnd));
args->mac_addr[0] = 2;
args->mac_addr[1] = 0xfe;
}
vif->host_if_name = args->host_if_name;
args->host_if_name = 0;
vif->net_ns = args->host_namespace;
args->host_namespace = 0;
args->error = ethernet_register_interface (vnm, virtio_device_class.index,
vif->dev_instance,
args->mac_addr,
&vif->hw_if_index,
virtio_eth_flag_change);
if (args->error)
{
args->rv = VNET_API_ERROR_INVALID_REGISTRATION;
goto error;
}
sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
vif->sw_if_index = sw->sw_if_index;
args->sw_if_index = vif->sw_if_index;
hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
vnet_hw_interface_set_input_node (vnm, vif->hw_if_index,
virtio_input_node.index);
vnet_hw_interface_assign_rx_thread (vnm, vif->hw_if_index, 0, ~0);
vnet_hw_interface_set_rx_mode (vnm, vif->hw_if_index, 0,
VNET_HW_INTERFACE_RX_MODE_DEFAULT);
vif->per_interface_next_index = ~0;
vif->type = VIRTIO_IF_TYPE_TAP;
vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
goto done;
error:
if (err)
{
ASSERT (args->error == 0);
args->error = err;
args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
}
if (vif->tap_fd != -1)
close (vif->tap_fd);
if (vif->fd != -1)
close (vif->fd);
vec_foreach_index (i, vif->vrings) virtio_vring_free (vif, i);
memset (vif, 0, sizeof (virtio_if_t));
pool_put (vim->interfaces, vif);
done:
if (vhost_mem)
clib_mem_free (vhost_mem);
if (fd != -1)
close (fd);
}
int
tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
{
vnet_main_t *vnm = vnet_get_main ();
virtio_main_t *mm = &virtio_main;
tap_main_t *tm = &tap_main;
int i;
virtio_if_t *vif;
vnet_hw_interface_t *hw;
hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
/* bring down the interface */
vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
vnet_sw_interface_set_flags (vnm, vif->sw_if_index, 0);
ethernet_delete_interface (vnm, vif->hw_if_index);
vif->hw_if_index = ~0;
if (vif->tap_fd != -1)
close (vif->tap_fd);
if (vif->fd != -1)
close (vif->fd);
vec_foreach_index (i, vif->vrings) virtio_vring_free (vif, i);
vec_free (vif->vrings);
hash_unset (tm->dev_instance_by_interface_id, vif->id);
memset (vif, 0, sizeof (*vif));
pool_put (mm->interfaces, vif);
return 0;
}
int
tap_dump_ifs (tap_interface_details_t ** out_tapids)
{
vnet_main_t *vnm = vnet_get_main ();
virtio_main_t *mm = &virtio_main;
virtio_if_t *vif;
vnet_hw_interface_t *hi;
tap_interface_details_t *r_tapids = NULL;
tap_interface_details_t *tapid = NULL;
/* *INDENT-OFF* */
pool_foreach (vif, mm->interfaces,
vec_add2(r_tapids, tapid, 1);
memset (tapid, 0, sizeof (*tapid));
tapid->sw_if_index = vif->sw_if_index;
hi = vnet_get_hw_interface (vnm, vif->hw_if_index);
clib_memcpy(tapid->dev_name, hi->name,
MIN (ARRAY_LEN (tapid->dev_name) - 1,
strlen ((const char *) hi->name)));
);
/* *INDENT-ON* */
*out_tapids = r_tapids;
return 0;
}
static clib_error_t *
tap_init (vlib_main_t * vm)
{
tap_main_t *tm = &tap_main;
tm->dev_instance_by_interface_id = hash_create (0, sizeof (uword));
return 0;
}
VLIB_INIT_FUNCTION (tap_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/