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);
78 #define TAP_MAX_INSTANCE 1024
81 tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
83 vnet_main_t *vnm = vnet_get_main ();
84 vlib_thread_main_t *thm = vlib_get_thread_main ();
85 virtio_main_t *vim = &virtio_main;
86 tap_main_t *tm = &tap_main;
87 vnet_sw_interface_t *sw;
88 vnet_hw_interface_t *hw;
90 int old_netns_fd = -1;
93 struct vhost_memory *vhost_mem = 0;
95 clib_error_t *err = 0;
100 if (clib_bitmap_get (tm->tap_ids, args->id))
102 args->rv = VNET_API_ERROR_INVALID_INTERFACE;
103 args->error = clib_error_return (0, "interface already exists");
109 args->id = clib_bitmap_first_clear (tm->tap_ids);
112 if (args->id > TAP_MAX_INSTANCE)
114 args->rv = VNET_API_ERROR_UNSPECIFIED;
115 args->error = clib_error_return (0, "cannot find free interface id");
119 clib_memset (&ifr, 0, sizeof (ifr));
120 pool_get (vim->interfaces, vif);
121 vif->dev_instance = vif - vim->interfaces;
125 if ((vif->fd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
127 args->rv = VNET_API_ERROR_SYSCALL_ERROR_1;
128 args->error = clib_error_return_unix (0, "open '/dev/vhost-net'");
132 _IOCTL (vif->fd, VHOST_GET_FEATURES, &vif->remote_features);
134 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF)) == 0)
136 args->rv = VNET_API_ERROR_UNSUPPORTED;
137 args->error = clib_error_return (0, "vhost-net backend doesn't support "
138 "VIRTIO_NET_F_MRG_RXBUF feature");
142 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) ==
145 args->rv = VNET_API_ERROR_UNSUPPORTED;
146 args->error = clib_error_return (0, "vhost-net backend doesn't support "
147 "VIRTIO_RING_F_INDIRECT_DESC feature");
151 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_F_VERSION_1)) == 0)
153 args->rv = VNET_API_ERROR_UNSUPPORTED;
154 args->error = clib_error_return (0, "vhost-net backend doesn't support "
155 "VIRTIO_F_VERSION_1 features");
159 vif->features |= VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF);
160 vif->features |= VIRTIO_FEATURE (VIRTIO_F_VERSION_1);
161 vif->features |= VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC);
163 virtio_set_net_hdr_size (vif);
165 _IOCTL (vif->fd, VHOST_SET_FEATURES, &vif->features);
167 if ((vif->tap_fd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
169 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
170 args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
174 ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR;
175 _IOCTL (vif->tap_fd, TUNSETIFF, (void *) &ifr);
176 vif->ifindex = if_nametoindex (ifr.ifr_ifrn.ifrn_name);
178 if (!args->host_if_name)
179 args->host_if_name = (u8 *) ifr.ifr_ifrn.ifrn_name;
181 unsigned int offload = 0;
182 hdrsz = sizeof (struct virtio_net_hdr_v1);
183 if (args->tap_flags & TAP_FLAG_GSO)
185 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
186 vif->gso_enabled = 1;
190 vif->gso_enabled = 0;
193 _IOCTL (vif->tap_fd, TUNSETOFFLOAD, offload);
194 _IOCTL (vif->tap_fd, TUNSETVNETHDRSZ, &hdrsz);
195 _IOCTL (vif->fd, VHOST_SET_OWNER, 0);
197 /* if namespace is specified, all further netlink messages should be excuted
198 after we change our net namespace */
199 if (args->host_namespace)
201 old_netns_fd = open ("/proc/self/ns/net", O_RDONLY);
202 if ((fd = open_netns_fd ((char *) args->host_namespace)) == -1)
204 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
205 args->error = clib_error_return_unix (0, "open_netns_fd '%s'",
206 args->host_namespace);
209 args->error = vnet_netlink_set_link_netns (vif->ifindex, fd,
210 (char *) args->host_if_name);
213 args->rv = VNET_API_ERROR_NETLINK_ERROR;
216 if (setns (fd, CLONE_NEWNET) == -1)
218 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
219 args->error = clib_error_return_unix (0, "setns '%s'",
220 args->host_namespace);
223 if ((vif->ifindex = if_nametoindex ((char *) args->host_if_name)) == 0)
225 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
226 args->error = clib_error_return_unix (0, "if_nametoindex '%s'",
233 if (args->host_if_name)
235 args->error = vnet_netlink_set_link_name (vif->ifindex,
240 args->rv = VNET_API_ERROR_NETLINK_ERROR;
246 if (!ethernet_mac_address_is_zero (args->host_mac_addr))
248 args->error = vnet_netlink_set_link_addr (vif->ifindex,
249 args->host_mac_addr);
252 args->rv = VNET_API_ERROR_NETLINK_ERROR;
257 if (args->host_bridge)
259 args->error = vnet_netlink_set_link_master (vif->ifindex,
260 (char *) args->host_bridge);
263 args->rv = VNET_API_ERROR_NETLINK_ERROR;
269 if (args->host_ip4_prefix_len)
271 args->error = vnet_netlink_add_ip4_addr (vif->ifindex,
272 &args->host_ip4_addr,
273 args->host_ip4_prefix_len);
276 args->rv = VNET_API_ERROR_NETLINK_ERROR;
281 if (args->host_ip6_prefix_len)
283 args->error = vnet_netlink_add_ip6_addr (vif->ifindex,
284 &args->host_ip6_addr,
285 args->host_ip6_prefix_len);
288 args->rv = VNET_API_ERROR_NETLINK_ERROR;
293 args->error = vnet_netlink_set_link_state (vif->ifindex, 1 /* UP */ );
296 args->rv = VNET_API_ERROR_NETLINK_ERROR;
300 if (args->host_ip4_gw_set)
302 args->error = vnet_netlink_add_ip4_route (0, 0, &args->host_ip4_gw);
305 args->rv = VNET_API_ERROR_NETLINK_ERROR;
310 if (args->host_ip6_gw_set)
312 args->error = vnet_netlink_add_ip6_route (0, 0, &args->host_ip6_gw);
315 args->rv = VNET_API_ERROR_NETLINK_ERROR;
320 /* switch back to old net namespace */
321 if (args->host_namespace)
323 if (setns (old_netns_fd, CLONE_NEWNET) == -1)
325 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
326 args->error = clib_error_return_unix (0, "setns '%s'",
327 args->host_namespace);
332 /* Set vhost memory table */
333 i = sizeof (struct vhost_memory) + sizeof (struct vhost_memory_region);
334 vhost_mem = clib_mem_alloc (i);
335 clib_memset (vhost_mem, 0, i);
336 vhost_mem->nregions = 1;
337 vhost_mem->regions[0].memory_size = (1ULL << 47) - 4096;
338 _IOCTL (vif->fd, VHOST_SET_MEM_TABLE, vhost_mem);
341 virtio_vring_init (vm, vif, RX_QUEUE (0), args->rx_ring_sz)))
343 args->rv = VNET_API_ERROR_INIT_FAILED;
349 virtio_vring_init (vm, vif, TX_QUEUE (0), args->tx_ring_sz)))
351 args->rv = VNET_API_ERROR_INIT_FAILED;
356 if (!args->mac_addr_set)
357 ethernet_mac_address_generate (args->mac_addr);
359 clib_memcpy (vif->mac_addr, args->mac_addr, 6);
361 vif->host_if_name = args->host_if_name;
362 args->host_if_name = 0;
363 vif->net_ns = args->host_namespace;
364 args->host_namespace = 0;
365 vif->host_bridge = args->host_bridge;
366 args->host_bridge = 0;
367 clib_memcpy (vif->host_mac_addr, args->host_mac_addr, 6);
368 vif->host_ip4_prefix_len = args->host_ip4_prefix_len;
369 vif->host_ip6_prefix_len = args->host_ip6_prefix_len;
370 if (args->host_ip4_prefix_len)
371 clib_memcpy (&vif->host_ip4_addr, &args->host_ip4_addr, 4);
372 if (args->host_ip6_prefix_len)
373 clib_memcpy (&vif->host_ip6_addr, &args->host_ip6_addr, 16);
375 vif->type = VIRTIO_IF_TYPE_TAP;
376 args->error = ethernet_register_interface (vnm, virtio_device_class.index,
380 virtio_eth_flag_change);
383 args->rv = VNET_API_ERROR_INVALID_REGISTRATION;
387 tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 1);
388 sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
389 vif->sw_if_index = sw->sw_if_index;
390 args->sw_if_index = vif->sw_if_index;
391 hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
392 hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
393 if (args->tap_flags & TAP_FLAG_GSO)
395 hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
396 vnm->interface_main.gso_interface_count++;
398 vnet_hw_interface_set_input_node (vnm, vif->hw_if_index,
399 virtio_input_node.index);
400 vnet_hw_interface_assign_rx_thread (vnm, vif->hw_if_index, 0, ~0);
401 vnet_hw_interface_set_rx_mode (vnm, vif->hw_if_index, 0,
402 VNET_HW_INTERFACE_RX_MODE_DEFAULT);
403 vif->per_interface_next_index = ~0;
404 virtio_vring_set_numa_node (vm, vif, RX_QUEUE (0));
405 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
406 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
407 VNET_HW_INTERFACE_FLAG_LINK_UP);
408 vif->cxq_vring = NULL;
410 if (thm->n_vlib_mains > 1)
411 clib_spinlock_init (&vif->lockp);
417 ASSERT (args->error == 0);
419 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
421 if (vif->tap_fd != -1)
425 vec_foreach_index (i, vif->rxq_vrings) virtio_vring_free_rx (vm, vif,
427 vec_foreach_index (i, vif->txq_vrings) virtio_vring_free_tx (vm, vif,
429 vec_free (vif->rxq_vrings);
430 vec_free (vif->txq_vrings);
431 clib_memset (vif, 0, sizeof (virtio_if_t));
432 pool_put (vim->interfaces, vif);
436 clib_mem_free (vhost_mem);
437 if (old_netns_fd != -1)
438 close (old_netns_fd);
444 tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
446 vnet_main_t *vnm = vnet_get_main ();
447 virtio_main_t *mm = &virtio_main;
448 tap_main_t *tm = &tap_main;
451 vnet_hw_interface_t *hw;
453 hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
454 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
455 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
457 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
459 if (vif->type != VIRTIO_IF_TYPE_TAP)
460 return VNET_API_ERROR_INVALID_INTERFACE;
462 /* decrement if this was a GSO interface */
463 if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
464 vnm->interface_main.gso_interface_count--;
466 /* bring down the interface */
467 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
468 vnet_sw_interface_set_flags (vnm, vif->sw_if_index, 0);
469 vnet_hw_interface_unassign_rx_thread (vnm, vif->hw_if_index, RX_QUEUE (0));
471 ethernet_delete_interface (vnm, vif->hw_if_index);
472 vif->hw_if_index = ~0;
474 if (vif->tap_fd != -1)
479 vec_foreach_index (i, vif->rxq_vrings) virtio_vring_free_rx (vm, vif,
481 vec_foreach_index (i, vif->txq_vrings) virtio_vring_free_tx (vm, vif,
483 vec_free (vif->rxq_vrings);
484 vec_free (vif->txq_vrings);
486 tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 0);
487 clib_spinlock_free (&vif->lockp);
488 clib_memset (vif, 0, sizeof (*vif));
489 pool_put (mm->interfaces, vif);
495 tap_gso_enable_disable (vlib_main_t * vm, u32 sw_if_index, int enable_disable)
497 vnet_main_t *vnm = vnet_get_main ();
498 virtio_main_t *mm = &virtio_main;
500 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
501 clib_error_t *err = 0;
503 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
504 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
506 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
508 const unsigned int gso_on = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
509 const unsigned int gso_off = 0;
510 unsigned int offload = enable_disable ? gso_on : gso_off;
511 _IOCTL (vif->tap_fd, TUNSETOFFLOAD, offload);
512 vif->gso_enabled = enable_disable ? 1 : 0;
515 if ((hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0)
517 vnm->interface_main.gso_interface_count++;
518 hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
523 if ((hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) != 0)
525 vnm->interface_main.gso_interface_count--;
526 hw->flags &= ~VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
533 clib_warning ("Error %s gso on sw_if_index %d",
534 enable_disable ? "enabling" : "disabling", sw_if_index);
535 return VNET_API_ERROR_SYSCALL_ERROR_3;
541 tap_dump_ifs (tap_interface_details_t ** out_tapids)
543 vnet_main_t *vnm = vnet_get_main ();
544 virtio_main_t *mm = &virtio_main;
546 virtio_vring_t *vring;
547 vnet_hw_interface_t *hi;
548 tap_interface_details_t *r_tapids = NULL;
549 tap_interface_details_t *tapid = NULL;
552 pool_foreach (vif, mm->interfaces,
553 if (vif->type != VIRTIO_IF_TYPE_TAP)
555 vec_add2(r_tapids, tapid, 1);
556 clib_memset (tapid, 0, sizeof (*tapid));
558 tapid->sw_if_index = vif->sw_if_index;
559 hi = vnet_get_hw_interface (vnm, vif->hw_if_index);
560 clib_memcpy(tapid->dev_name, hi->name,
561 MIN (ARRAY_LEN (tapid->dev_name) - 1,
562 strlen ((const char *) hi->name)));
563 vring = vec_elt_at_index (vif->rxq_vrings, RX_QUEUE_ACCESS(0));
564 tapid->rx_ring_sz = vring->size;
565 vring = vec_elt_at_index (vif->txq_vrings, TX_QUEUE_ACCESS(0));
566 tapid->tx_ring_sz = vring->size;
567 clib_memcpy(tapid->host_mac_addr, vif->host_mac_addr, 6);
568 if (vif->host_if_name)
570 clib_memcpy(tapid->host_if_name, vif->host_if_name,
571 MIN (ARRAY_LEN (tapid->host_if_name) - 1,
572 strlen ((const char *) vif->host_if_name)));
576 clib_memcpy(tapid->host_namespace, vif->net_ns,
577 MIN (ARRAY_LEN (tapid->host_namespace) - 1,
578 strlen ((const char *) vif->net_ns)));
580 if (vif->host_bridge)
582 clib_memcpy(tapid->host_bridge, vif->host_bridge,
583 MIN (ARRAY_LEN (tapid->host_bridge) - 1,
584 strlen ((const char *) vif->host_bridge)));
586 if (vif->host_ip4_prefix_len)
587 clib_memcpy(tapid->host_ip4_addr, &vif->host_ip4_addr, 4);
588 tapid->host_ip4_prefix_len = vif->host_ip4_prefix_len;
589 if (vif->host_ip6_prefix_len)
590 clib_memcpy(tapid->host_ip6_addr, &vif->host_ip6_addr, 16);
591 tapid->host_ip6_prefix_len = vif->host_ip6_prefix_len;
595 *out_tapids = r_tapids;
600 static clib_error_t *
601 tap_init (vlib_main_t * vm)
603 tap_main_t *tm = &tap_main;
604 clib_error_t *error = 0;
606 tm->log_default = vlib_log_register_class ("tap", 0);
607 vlib_log_debug (tm->log_default, "initialized");
612 VLIB_INIT_FUNCTION (tap_init);
615 * fd.io coding-style-patch-verification: ON
618 * eval: (c-set-style "gnu")