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/*
* Copyright 2016 Intel Corporation
*
* 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 "tap_inject.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <netinet/in.h>
#include <vnet/unix/tuntap.h>
#include <vlib/unix/unix.h>
static clib_error_t *
tap_inject_tap_read (clib_file_t * f)
{
vlib_main_t * vm = vlib_get_main ();
tap_inject_main_t * im = tap_inject_get_main ();
vec_add1 (im->rx_file_descriptors, f->file_descriptor);
vlib_node_set_interrupt_pending (vm, im->rx_node_index);
return 0;
}
#define TAP_INJECT_TAP_BASE_NAME "vpp"
clib_error_t *
tap_inject_tap_connect (vnet_hw_interface_t * hw)
{
vnet_main_t * vnet_main = vnet_get_main ();
vnet_sw_interface_t * sw = vnet_get_sw_interface (vnet_main, hw->hw_if_index);
static const int one = 1;
int fd;
struct ifreq ifr;
clib_file_t template;
u32 tap_fd;
u8 * name;
memset (&ifr, 0, sizeof (ifr));
memset (&template, 0, sizeof (template));
ASSERT (hw->hw_if_index == sw->sw_if_index);
/* Create the tap. */
tap_fd = open ("/dev/net/tun", O_RDWR);
if ((int)tap_fd < 0)
return clib_error_return (0, "failed to open tun device");
name = format (0, TAP_INJECT_TAP_BASE_NAME "%u%c", hw->hw_instance, 0);
strncpy (ifr.ifr_name, (char *) name, sizeof (ifr.ifr_name) - 1);
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (ioctl (tap_fd, TUNSETIFF, (void *)&ifr) < 0)
{
close (tap_fd);
return clib_error_return (0, "failed to create tap");
}
if (ioctl (tap_fd, FIONBIO, &one) < 0)
{
close (tap_fd);
return clib_error_return (0, "failed to set tap to non-blocking io");
}
/* Open a socket to configure the device. */
fd = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL));
if (fd < 0)
{
close (tap_fd);
return clib_error_return (0, "failed to configure tap");
}
if (hw->hw_address)
clib_memcpy (ifr.ifr_hwaddr.sa_data, hw->hw_address, ETHER_ADDR_LEN);
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
/* Set the hardware address. */
if (ioctl (fd, SIOCSIFHWADDR, &ifr) < 0)
{
close (tap_fd);
close (fd);
return clib_error_return (0, "failed to set tap hardware address");
}
/* Get the tap if index. */
if (ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
{
close (tap_fd);
close (fd);
return clib_error_return (0, "failed to procure tap if index");
}
close (fd);
/* Get notified when the tap needs to be read. */
template.read_function = tap_inject_tap_read;
template.file_descriptor = tap_fd;
clib_file_add (&file_main, &template);
tap_inject_insert_tap (sw->sw_if_index, tap_fd, ifr.ifr_ifindex);
return 0;
}
clib_error_t *
tap_inject_tap_disconnect (u32 sw_if_index)
{
u32 tap_fd;
tap_fd = tap_inject_lookup_tap_fd (sw_if_index);
if (tap_fd == ~0)
return clib_error_return (0, "failed to disconnect tap");
tap_inject_delete_tap (sw_if_index);
close (tap_fd);
return 0;
}
u8 *
format_tap_inject_tap_name (u8 * s, va_list * args)
{
int fd;
struct ifreq ifr;
fd = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL));
if (fd < 0)
return 0;
memset (&ifr, 0, sizeof (ifr));
ifr.ifr_ifindex = va_arg (*args, u32);
if (ioctl (fd, SIOCGIFNAME, &ifr) < 0)
{
close (fd);
return 0;
}
close (fd);
return format (s, "%s", ifr.ifr_name);
}
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