2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
19 #include <sys/types.h>
23 #include <linux/if_tun.h>
24 #include <sys/ioctl.h>
25 #include <linux/virtio_net.h>
26 #include <linux/vhost.h>
27 #include <sys/eventfd.h>
30 #include <linux/netlink.h>
31 #include <linux/rtnetlink.h>
33 #include <vlib/vlib.h>
34 #include <vlib/unix/unix.h>
35 #include <vnet/ethernet/ethernet.h>
36 #include <vnet/ip/ip4_packet.h>
37 #include <vnet/ip/ip6_packet.h>
38 #include <vnet/devices/netlink.h>
39 #include <vnet/devices/virtio/virtio.h>
40 #include <vnet/devices/tap/tap.h>
44 #define _IOCTL(fd,a,...) \
45 if (ioctl (fd, a, __VA_ARGS__) < 0) \
47 err = clib_error_return_unix (0, "ioctl(" #a ")"); \
52 virtio_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
56 //TODO On MTU change call vnet_netlink_set_if_mtu
61 open_netns_fd (char *netns)
66 if (strncmp (netns, "pid:", 4) == 0)
67 s = format (0, "/proc/%u/ns/net%c", atoi (netns + 4), 0);
68 else if (netns[0] == '/')
69 s = format (0, "%s%c", netns, 0);
71 s = format (0, "/var/run/netns/%s%c", netns, 0);
73 fd = open ((char *) s, O_RDONLY);
80 tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
82 vnet_main_t *vnm = vnet_get_main ();
83 vlib_thread_main_t *thm = vlib_get_thread_main ();
84 virtio_main_t *vim = &virtio_main;
85 tap_main_t *tm = &tap_main;
86 vnet_sw_interface_t *sw;
87 vnet_hw_interface_t *hw;
89 int old_netns_fd = -1;
92 struct vhost_memory *vhost_mem = 0;
94 clib_error_t *err = 0;
99 p = hash_get (tm->dev_instance_by_interface_id, args->id);
102 args->rv = VNET_API_ERROR_INVALID_INTERFACE;
103 args->error = clib_error_return (0, "interface already exists");
112 args->id = tm->last_used_interface_id++;
113 p = hash_get (tm->dev_instance_by_interface_id, args->id);
120 args->rv = VNET_API_ERROR_UNSPECIFIED;
122 clib_error_return (0, "cannot find free interface id");
127 memset (&ifr, 0, sizeof (ifr));
128 pool_get (vim->interfaces, vif);
129 vif->dev_instance = vif - vim->interfaces;
133 if ((vif->fd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
135 args->rv = VNET_API_ERROR_SYSCALL_ERROR_1;
136 args->error = clib_error_return_unix (0, "open '/dev/vhost-net'");
140 _IOCTL (vif->fd, VHOST_GET_FEATURES, &vif->remote_features);
142 if ((vif->remote_features & (1ULL << VIRTIO_NET_F_MRG_RXBUF)) == 0)
144 args->rv = VNET_API_ERROR_UNSUPPORTED;
145 args->error = clib_error_return (0, "vhost-net backend doesn't support "
146 "VIRTIO_NET_F_MRG_RXBUF feature");
150 if ((vif->remote_features & (1ULL << VIRTIO_RING_F_INDIRECT_DESC)) == 0)
152 args->rv = VNET_API_ERROR_UNSUPPORTED;
153 args->error = clib_error_return (0, "vhost-net backend doesn't support "
154 "VIRTIO_RING_F_INDIRECT_DESC feature");
158 if ((vif->remote_features & (1ULL << VIRTIO_F_VERSION_1)) == 0)
160 args->rv = VNET_API_ERROR_UNSUPPORTED;
161 args->error = clib_error_return (0, "vhost-net backend doesn't support "
162 "VIRTIO_F_VERSION_1 features");
166 vif->features |= 1ULL << VIRTIO_NET_F_MRG_RXBUF;
167 vif->features |= 1ULL << VIRTIO_F_VERSION_1;
168 vif->features |= 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
170 _IOCTL (vif->fd, VHOST_SET_FEATURES, &vif->features);
172 if ((vif->tap_fd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
174 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
175 args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
179 ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR;
180 _IOCTL (vif->tap_fd, TUNSETIFF, (void *) &ifr);
181 vif->ifindex = if_nametoindex (ifr.ifr_ifrn.ifrn_name);
183 unsigned int offload = 0;
184 hdrsz = sizeof (struct virtio_net_hdr_v1);
185 _IOCTL (vif->tap_fd, TUNSETOFFLOAD, offload);
186 _IOCTL (vif->tap_fd, TUNSETVNETHDRSZ, &hdrsz);
187 _IOCTL (vif->fd, VHOST_SET_OWNER, 0);
189 /* if namespace is specified, all further netlink messages should be excuted
190 after we change our net namespace */
191 if (args->host_namespace)
194 old_netns_fd = open ("/proc/self/ns/net", O_RDONLY);
195 if ((fd = open_netns_fd ((char *) args->host_namespace)) == -1)
197 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
198 args->error = clib_error_return_unix (0, "open_netns_fd '%s'",
199 args->host_namespace);
202 args->error = vnet_netlink_set_link_netns (vif->ifindex, fd,
203 (char *) args->host_if_name);
206 args->rv = VNET_API_ERROR_NETLINK_ERROR;
209 if (setns (fd, CLONE_NEWNET) == -1)
211 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
212 args->error = clib_error_return_unix (0, "setns '%s'",
213 args->host_namespace);
217 if ((vif->ifindex = if_nametoindex ((char *) args->host_if_name)) == 0)
219 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
220 args->error = clib_error_return_unix (0, "if_nametoindex '%s'",
227 if (args->host_if_name)
229 args->error = vnet_netlink_set_link_name (vif->ifindex,
234 args->rv = VNET_API_ERROR_NETLINK_ERROR;
240 if (!ethernet_mac_address_is_zero (args->host_mac_addr))
242 args->error = vnet_netlink_set_link_addr (vif->ifindex,
243 args->host_mac_addr);
246 args->rv = VNET_API_ERROR_NETLINK_ERROR;
251 if (args->host_bridge)
253 args->error = vnet_netlink_set_link_master (vif->ifindex,
254 (char *) args->host_bridge);
257 args->rv = VNET_API_ERROR_NETLINK_ERROR;
263 if (args->host_ip4_prefix_len)
265 args->error = vnet_netlink_add_ip4_addr (vif->ifindex,
266 &args->host_ip4_addr,
267 args->host_ip4_prefix_len);
270 args->rv = VNET_API_ERROR_NETLINK_ERROR;
275 if (args->host_ip6_prefix_len)
277 args->error = vnet_netlink_add_ip6_addr (vif->ifindex,
278 &args->host_ip6_addr,
279 args->host_ip6_prefix_len);
282 args->rv = VNET_API_ERROR_NETLINK_ERROR;
287 args->error = vnet_netlink_set_link_state (vif->ifindex, 1 /* UP */ );
290 args->rv = VNET_API_ERROR_NETLINK_ERROR;
294 if (args->host_ip4_gw_set)
296 args->error = vnet_netlink_add_ip4_route (0, 0, &args->host_ip4_gw);
299 args->rv = VNET_API_ERROR_NETLINK_ERROR;
304 if (args->host_ip6_gw_set)
306 args->error = vnet_netlink_add_ip6_route (0, 0, &args->host_ip6_gw);
309 args->rv = VNET_API_ERROR_NETLINK_ERROR;
314 /* switch back to old net namespace */
315 if (args->host_namespace)
317 if (setns (old_netns_fd, CLONE_NEWNET) == -1)
319 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
320 args->error = clib_error_return_unix (0, "setns '%s'",
321 args->host_namespace);
326 /* Set vhost memory table */
327 i = sizeof (struct vhost_memory) + sizeof (struct vhost_memory_region);
328 vhost_mem = clib_mem_alloc (i);
329 memset (vhost_mem, 0, i);
330 vhost_mem->nregions = 1;
331 vhost_mem->regions[0].memory_size = (1ULL << 47) - 4096;
332 _IOCTL (vif->fd, VHOST_SET_MEM_TABLE, vhost_mem);
334 if ((args->error = virtio_vring_init (vm, vif, 0, args->rx_ring_sz)))
336 args->rv = VNET_API_ERROR_INIT_FAILED;
340 if ((args->error = virtio_vring_init (vm, vif, 1, args->tx_ring_sz)))
342 args->rv = VNET_API_ERROR_INIT_FAILED;
346 if (!args->mac_addr_set)
348 f64 now = vlib_time_now (vm);
350 rnd = (u32) (now * 1e6);
351 rnd = random_u32 (&rnd);
353 memcpy (args->mac_addr + 2, &rnd, sizeof (rnd));
354 args->mac_addr[0] = 2;
355 args->mac_addr[1] = 0xfe;
357 vif->rx_ring_sz = args->rx_ring_sz != 0 ? args->rx_ring_sz : 256;
358 vif->tx_ring_sz = args->tx_ring_sz != 0 ? args->tx_ring_sz : 256;
359 vif->host_if_name = args->host_if_name;
360 args->host_if_name = 0;
361 vif->net_ns = args->host_namespace;
362 args->host_namespace = 0;
363 vif->host_bridge = args->host_bridge;
364 args->host_bridge = 0;
365 clib_memcpy (vif->host_mac_addr, args->host_mac_addr, 6);
366 vif->host_ip4_prefix_len = args->host_ip4_prefix_len;
367 vif->host_ip6_prefix_len = args->host_ip6_prefix_len;
368 if (args->host_ip4_prefix_len)
369 clib_memcpy (&vif->host_ip4_addr, &args->host_ip4_addr, 4);
370 if (args->host_ip6_prefix_len)
371 clib_memcpy (&vif->host_ip6_addr, &args->host_ip6_addr, 16);
373 args->error = ethernet_register_interface (vnm, virtio_device_class.index,
377 virtio_eth_flag_change);
380 args->rv = VNET_API_ERROR_INVALID_REGISTRATION;
384 hash_set (tm->dev_instance_by_interface_id, vif->id, vif->dev_instance);
386 sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
387 vif->sw_if_index = sw->sw_if_index;
388 args->sw_if_index = vif->sw_if_index;
389 hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
390 hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
391 vnet_hw_interface_set_input_node (vnm, vif->hw_if_index,
392 virtio_input_node.index);
393 vnet_hw_interface_assign_rx_thread (vnm, vif->hw_if_index, 0, ~0);
394 vnet_hw_interface_set_rx_mode (vnm, vif->hw_if_index, 0,
395 VNET_HW_INTERFACE_RX_MODE_DEFAULT);
396 vif->per_interface_next_index = ~0;
397 vif->type = VIRTIO_IF_TYPE_TAP;
398 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
399 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
400 VNET_HW_INTERFACE_FLAG_LINK_UP);
401 if (thm->n_vlib_mains > 1)
402 clib_spinlock_init (&vif->lockp);
408 ASSERT (args->error == 0);
410 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
412 if (vif->tap_fd != -1)
416 vec_foreach_index (i, vif->vrings) virtio_vring_free (vm, vif, i);
417 memset (vif, 0, sizeof (virtio_if_t));
418 pool_put (vim->interfaces, vif);
422 clib_mem_free (vhost_mem);
423 if (old_netns_fd != -1)
424 close (old_netns_fd);
428 tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
430 vnet_main_t *vnm = vnet_get_main ();
431 virtio_main_t *mm = &virtio_main;
432 tap_main_t *tm = &tap_main;
435 vnet_hw_interface_t *hw;
437 hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
438 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
439 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
441 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
443 /* bring down the interface */
444 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
445 vnet_sw_interface_set_flags (vnm, vif->sw_if_index, 0);
446 vnet_hw_interface_unassign_rx_thread (vnm, vif->hw_if_index, 0);
448 ethernet_delete_interface (vnm, vif->hw_if_index);
449 vif->hw_if_index = ~0;
451 if (vif->tap_fd != -1)
456 vec_foreach_index (i, vif->vrings) virtio_vring_free (vm, vif, i);
457 vec_free (vif->vrings);
459 hash_unset (tm->dev_instance_by_interface_id, vif->id);
460 clib_spinlock_free (&vif->lockp);
461 memset (vif, 0, sizeof (*vif));
462 pool_put (mm->interfaces, vif);
468 tap_dump_ifs (tap_interface_details_t ** out_tapids)
470 vnet_main_t *vnm = vnet_get_main ();
471 virtio_main_t *mm = &virtio_main;
473 vnet_hw_interface_t *hi;
474 tap_interface_details_t *r_tapids = NULL;
475 tap_interface_details_t *tapid = NULL;
478 pool_foreach (vif, mm->interfaces,
479 vec_add2(r_tapids, tapid, 1);
480 memset (tapid, 0, sizeof (*tapid));
482 tapid->sw_if_index = vif->sw_if_index;
483 hi = vnet_get_hw_interface (vnm, vif->hw_if_index);
484 clib_memcpy(tapid->dev_name, hi->name,
485 MIN (ARRAY_LEN (tapid->dev_name) - 1,
486 strlen ((const char *) hi->name)));
487 tapid->rx_ring_sz = vif->rx_ring_sz;
488 tapid->tx_ring_sz = vif->tx_ring_sz;
489 clib_memcpy(tapid->host_mac_addr, vif->host_mac_addr, 6);
490 if (vif->host_if_name)
492 clib_memcpy(tapid->host_if_name, vif->host_if_name,
493 MIN (ARRAY_LEN (tapid->host_if_name) - 1,
494 strlen ((const char *) vif->host_if_name)));
498 clib_memcpy(tapid->host_namespace, vif->net_ns,
499 MIN (ARRAY_LEN (tapid->host_namespace) - 1,
500 strlen ((const char *) vif->net_ns)));
502 if (vif->host_bridge)
504 clib_memcpy(tapid->host_bridge, vif->host_bridge,
505 MIN (ARRAY_LEN (tapid->host_bridge) - 1,
506 strlen ((const char *) vif->host_bridge)));
508 if (vif->host_ip4_prefix_len)
509 clib_memcpy(tapid->host_ip4_addr, &vif->host_ip4_addr, 4);
510 tapid->host_ip4_prefix_len = vif->host_ip4_prefix_len;
511 if (vif->host_ip6_prefix_len)
512 clib_memcpy(tapid->host_ip6_addr, &vif->host_ip6_addr, 16);
513 tapid->host_ip6_prefix_len = vif->host_ip6_prefix_len;
517 *out_tapids = r_tapids;
522 static clib_error_t *
523 tap_init (vlib_main_t * vm)
525 tap_main_t *tm = &tap_main;
526 tm->dev_instance_by_interface_id = hash_create (0, sizeof (uword));
530 VLIB_INIT_FUNCTION (tap_init);
533 * fd.io coding-style-patch-verification: ON
536 * eval: (c-set-style "gnu")