2 *------------------------------------------------------------------
3 * tapcli.c - dynamic tap interface hookup
5 * Copyright (c) 2009 Cisco and/or its affiliates.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at:
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *------------------------------------------------------------------
21 * @brief dynamic tap interface hookup
24 #include <fcntl.h> /* for open */
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
28 #include <sys/types.h>
29 #include <sys/uio.h> /* for iovec */
30 #include <netinet/in.h>
32 #include <linux/if_arp.h>
33 #include <linux/if_tun.h>
35 #include <vlib/vlib.h>
36 #include <vlib/unix/unix.h>
38 #include <vnet/ip/ip.h>
40 #include <vnet/ethernet/ethernet.h>
42 #include <vnet/feature/feature.h>
43 #include <vnet/devices/devices.h>
44 #include <vnet/unix/tuntap.h>
45 #include <vnet/unix/tapcli.h>
47 static vnet_device_class_t tapcli_dev_class;
48 static vnet_hw_interface_class_t tapcli_interface_class;
49 static vlib_node_registration_t tapcli_rx_node;
51 static void tapcli_nopunt_frame (vlib_main_t * vm,
52 vlib_node_runtime_t * node,
53 vlib_frame_t * frame);
55 * @brief Struct for the tapcli interface
67 u32 per_interface_next_index;
73 * @brief Struct for RX trace
81 * @brief Function to format TAP CLI trace
83 * @param *s - u8 - formatting string
84 * @param *va - va_list
86 * @return *s - u8 - formatted string
90 format_tapcli_rx_trace (u8 * s, va_list * va)
92 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
93 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
94 vnet_main_t *vnm = vnet_get_main ();
95 tapcli_rx_trace_t *t = va_arg (*va, tapcli_rx_trace_t *);
96 s = format (s, "%U", format_vnet_sw_if_index_name, vnm, t->sw_if_index);
101 * @brief TAPCLI per thread struct
105 /** Vector of VLIB rx buffers to use. We allocate them in blocks
106 of VLIB_FRAME_SIZE (256). */
109 /** Vector of iovecs for readv/writev calls. */
110 struct iovec *iovecs;
111 } tapcli_per_thread_t;
114 * @brief TAPCLI main state struct
118 /** per thread variables */
119 tapcli_per_thread_t *threads;
121 /** tap device destination MAC address. Required, or Linux drops pkts */
124 /** Interface MTU in bytes and # of default sized buffers. */
125 u32 mtu_bytes, mtu_buffers;
127 /** Vector of tap interfaces */
128 tapcli_interface_t *tapcli_interfaces;
130 /** Vector of deleted tap interfaces */
131 u32 *tapcli_inactive_interfaces;
133 /** Bitmap of tap interfaces with pending reads */
134 uword *pending_read_bitmap;
136 /** Hash table to find tapcli interface given hw_if_index */
137 uword *tapcli_interface_index_by_sw_if_index;
139 /** Hash table to find tapcli interface given unix fd */
140 uword *tapcli_interface_index_by_unix_fd;
142 /** renumbering table */
143 u32 *show_dev_instance_by_real_dev_instance;
145 /** 1 => disable CLI */
148 /** convenience - vlib_main_t */
149 vlib_main_t *vlib_main;
150 /** convenience - vnet_main_t */
151 vnet_main_t *vnet_main;
154 static tapcli_main_t tapcli_main;
157 * @brief tapcli TX node function
160 * Output node, writes the buffers comprising the incoming frame
161 * to the tun/tap device, aka hands them to the Linux kernel stack.
163 * @param *vm - vlib_main_t
164 * @param *node - vlib_node_runtime_t
165 * @param *frame - vlib_frame_t
167 * @return n_packets - uword
171 tapcli_tx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
173 u32 *buffers = vlib_frame_vector_args (frame);
174 uword n_packets = frame->n_vectors;
175 tapcli_main_t *tm = &tapcli_main;
176 tapcli_interface_t *ti;
178 u16 thread_index = vm->thread_index;
180 for (i = 0; i < n_packets; i++)
185 vnet_hw_interface_t *hw;
189 b = vlib_get_buffer (vm, buffers[i]);
191 tx_sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
192 if (tx_sw_if_index == (u32) ~ 0)
193 tx_sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
195 ASSERT (tx_sw_if_index != (u32) ~ 0);
197 /* Use the sup intfc to finesse vlan subifs */
198 hw = vnet_get_sup_hw_interface (tm->vnet_main, tx_sw_if_index);
199 tx_sw_if_index = hw->sw_if_index;
201 p = hash_get (tm->tapcli_interface_index_by_sw_if_index,
205 clib_warning ("sw_if_index %d unknown", tx_sw_if_index);
206 /* $$$ leak, but this should never happen... */
210 ti = vec_elt_at_index (tm->tapcli_interfaces, p[0]);
212 /* Re-set iovecs if present. */
213 if (tm->threads[thread_index].iovecs)
214 _vec_len (tm->threads[thread_index].iovecs) = 0;
216 /* VLIB buffer chain -> Unix iovec(s). */
217 vec_add2 (tm->threads[thread_index].iovecs, iov, 1);
218 iov->iov_base = b->data + b->current_data;
219 iov->iov_len = l = b->current_length;
221 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
225 b = vlib_get_buffer (vm, b->next_buffer);
227 vec_add2 (tm->threads[thread_index].iovecs, iov, 1);
229 iov->iov_base = b->data + b->current_data;
230 iov->iov_len = b->current_length;
231 l += b->current_length;
233 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
236 if (writev (ti->unix_fd, tm->threads[thread_index].iovecs,
237 vec_len (tm->threads[thread_index].iovecs)) < l)
238 clib_unix_warning ("writev");
241 vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors);
247 VLIB_REGISTER_NODE (tapcli_tx_node,static) = {
248 .function = tapcli_tx,
250 .type = VLIB_NODE_TYPE_INTERNAL,
256 * @brief Dispatch tapcli RX node function for node tap_cli_rx
259 * @param *vm - vlib_main_t
260 * @param *node - vlib_node_runtime_t
261 * @param *ti - tapcli_interface_t
263 * @return n_packets - uword
267 tapcli_rx_iface (vlib_main_t * vm,
268 vlib_node_runtime_t * node, tapcli_interface_t * ti)
270 tapcli_main_t *tm = &tapcli_main;
271 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
272 u32 n_trace = vlib_get_trace_count (vm, node);
274 u16 thread_index = vm->thread_index;
276 vnet_sw_interface_t *si;
278 u32 next = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
279 u32 n_left_to_next, next_index;
282 vnm = vnet_get_main ();
283 si = vnet_get_sw_interface (vnm, ti->sw_if_index);
284 admin_down = !(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP);
286 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
288 while (n_left_to_next)
289 { // Fill at most one vector
290 vlib_buffer_t *b_first, *b, *prev;
292 word n_bytes_in_packet;
295 if (PREDICT_FALSE (vec_len (tm->threads[thread_index].rx_buffers) <
298 uword len = vec_len (tm->threads[thread_index].rx_buffers);
299 _vec_len (tm->threads[thread_index].rx_buffers) +=
300 vlib_buffer_alloc (vm, &tm->threads[thread_index].rx_buffers[len],
301 VLIB_FRAME_SIZE - len);
303 (vec_len (tm->threads[thread_index].rx_buffers) <
306 vlib_node_increment_counter (vm, tapcli_rx_node.index,
307 TAPCLI_ERROR_BUFFER_ALLOC,
316 uword i_rx = vec_len (tm->threads[thread_index].rx_buffers) - 1;
318 /* Allocate RX buffers from end of rx_buffers.
319 Turn them into iovecs to pass to readv. */
320 vec_validate (tm->threads[thread_index].iovecs, tm->mtu_buffers - 1);
321 for (j = 0; j < tm->mtu_buffers; j++)
325 tm->threads[thread_index].rx_buffers[i_rx - j]);
326 tm->threads[thread_index].iovecs[j].iov_base = b->data;
327 tm->threads[thread_index].iovecs[j].iov_len = buffer_size;
330 n_bytes_left = readv (ti->unix_fd, tm->threads[thread_index].iovecs,
332 n_bytes_in_packet = n_bytes_left;
333 if (n_bytes_left <= 0)
337 vlib_node_increment_counter (vm, tapcli_rx_node.index,
338 TAPCLI_ERROR_READ, 1);
343 bi_first = tm->threads[thread_index].rx_buffers[i_rx];
344 b = b_first = vlib_get_buffer (vm,
345 tm->threads[thread_index].
352 n_bytes_left < buffer_size ? n_bytes_left : buffer_size;
353 n_bytes_left -= buffer_size;
357 prev->next_buffer = bi;
358 prev->flags |= VLIB_BUFFER_NEXT_PRESENT;
363 if (n_bytes_left <= 0)
367 bi = tm->threads[thread_index].rx_buffers[i_rx];
368 b = vlib_get_buffer (vm, bi);
371 _vec_len (tm->threads[thread_index].rx_buffers) = i_rx;
373 b_first->total_length_not_including_first_buffer =
375 buffer_size) ? n_bytes_in_packet - buffer_size : 0;
376 b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
378 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_first);
380 vnet_buffer (b_first)->sw_if_index[VLIB_RX] = ti->sw_if_index;
381 vnet_buffer (b_first)->sw_if_index[VLIB_TX] = (u32) ~ 0;
383 b_first->error = node->errors[TAPCLI_ERROR_NONE];
384 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
385 next_index = (ti->per_interface_next_index != ~0) ?
386 ti->per_interface_next_index : next_index;
387 next_index = admin_down ? VNET_DEVICE_INPUT_NEXT_DROP : next_index;
389 to_next[0] = bi_first;
393 vnet_feature_start_device_input_x1 (ti->sw_if_index, &next_index,
396 vlib_validate_buffer_enqueue_x1 (vm, node, next,
397 to_next, n_left_to_next,
398 bi_first, next_index);
400 /* Interface counters for tapcli interface. */
401 if (PREDICT_TRUE (!admin_down))
403 vlib_increment_combined_counter (vnet_main.interface_main.
404 combined_sw_if_counters +
405 VNET_INTERFACE_COUNTER_RX,
406 thread_index, ti->sw_if_index, 1,
409 if (PREDICT_FALSE (n_trace > 0))
411 vlib_trace_buffer (vm, node, next_index,
412 b_first, /* follow_chain */ 1);
415 tapcli_rx_trace_t *t0 =
416 vlib_add_trace (vm, node, b_first, sizeof (*t0));
417 t0->sw_if_index = si->sw_if_index;
421 vlib_put_next_frame (vm, node, next, n_left_to_next);
423 vlib_set_trace_count (vm, node, n_trace);
424 return VLIB_FRAME_SIZE - n_left_to_next;
428 * @brief tapcli RX node function
431 * Input node from the Kernel tun/tap device
433 * @param *vm - vlib_main_t
434 * @param *node - vlib_node_runtime_t
435 * @param *frame - vlib_frame_t
437 * @return n_packets - uword
441 tapcli_rx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
443 tapcli_main_t *tm = &tapcli_main;
444 static u32 *ready_interface_indices;
445 tapcli_interface_t *ti;
449 vec_reset_length (ready_interface_indices);
451 clib_bitmap_foreach (i, tm->pending_read_bitmap,
453 vec_add1 (ready_interface_indices, i);
457 if (vec_len (ready_interface_indices) == 0)
460 for (i = 0; i < vec_len (ready_interface_indices); i++)
462 tm->pending_read_bitmap =
463 clib_bitmap_set (tm->pending_read_bitmap,
464 ready_interface_indices[i], 0);
467 vec_elt_at_index (tm->tapcli_interfaces, ready_interface_indices[i]);
468 total_count += tapcli_rx_iface (vm, node, ti);
470 return total_count; //This might return more than 256.
473 /** TAPCLI error strings */
474 static char *tapcli_rx_error_strings[] = {
475 #define _(sym,string) string,
481 VLIB_REGISTER_NODE (tapcli_rx_node, static) = {
482 .function = tapcli_rx,
484 .sibling_of = "device-input",
485 .type = VLIB_NODE_TYPE_INPUT,
486 .state = VLIB_NODE_STATE_INTERRUPT,
488 .n_errors = TAPCLI_N_ERROR,
489 .error_strings = tapcli_rx_error_strings,
490 .format_trace = format_tapcli_rx_trace,
496 * @brief Gets called when file descriptor is ready from epoll.
498 * @param *uf - clib_file_t
500 * @return error - clib_error_t
503 static clib_error_t *
504 tapcli_read_ready (clib_file_t * uf)
506 vlib_main_t *vm = vlib_get_main ();
507 tapcli_main_t *tm = &tapcli_main;
510 /** Schedule the rx node */
511 vlib_node_set_interrupt_pending (vm, tapcli_rx_node.index);
513 p = hash_get (tm->tapcli_interface_index_by_unix_fd, uf->file_descriptor);
515 /** Mark the specific tap interface ready-to-read */
517 tm->pending_read_bitmap = clib_bitmap_set (tm->pending_read_bitmap,
520 clib_warning ("fd %d not in hash table", uf->file_descriptor);
526 * @brief CLI function for TAPCLI configuration
528 * @param *vm - vlib_main_t
529 * @param *input - unformat_input_t
531 * @return error - clib_error_t
534 static clib_error_t *
535 tapcli_config (vlib_main_t * vm, unformat_input_t * input)
537 tapcli_main_t *tm = &tapcli_main;
538 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
540 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
542 if (unformat (input, "mtu %d", &tm->mtu_bytes))
544 else if (unformat (input, "disable"))
547 return clib_error_return (0, "unknown input `%U'",
548 format_unformat_error, input);
556 clib_warning ("tapcli disabled: must be superuser");
561 tm->mtu_buffers = (tm->mtu_bytes + (buffer_size - 1)) / buffer_size;
567 * @brief Renumber TAPCLI interface
569 * @param *hi - vnet_hw_interface_t
570 * @param new_dev_instance - u32
576 tap_name_renumber (vnet_hw_interface_t * hi, u32 new_dev_instance)
578 tapcli_main_t *tm = &tapcli_main;
580 vec_validate_init_empty (tm->show_dev_instance_by_real_dev_instance,
581 hi->dev_instance, ~0);
583 tm->show_dev_instance_by_real_dev_instance[hi->dev_instance] =
589 VLIB_CONFIG_FUNCTION (tapcli_config, "tapcli");
592 * @brief Free "no punt" frame
594 * @param *vm - vlib_main_t
595 * @param *node - vlib_node_runtime_t
596 * @param *frame - vlib_frame_t
600 tapcli_nopunt_frame (vlib_main_t * vm,
601 vlib_node_runtime_t * node, vlib_frame_t * frame)
603 u32 *buffers = vlib_frame_vector_args (frame);
604 uword n_packets = frame->n_vectors;
605 vlib_buffer_free (vm, buffers, n_packets);
606 vlib_frame_free (vm, node, frame);
610 VNET_HW_INTERFACE_CLASS (tapcli_interface_class,static) = {
612 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
617 * @brief Formatter for TAPCLI interface name
619 * @param *s - formatter string
620 * @param *args - va_list
622 * @return *s - formatted string
626 format_tapcli_interface_name (u8 * s, va_list * args)
628 u32 i = va_arg (*args, u32);
629 u32 show_dev_instance = ~0;
630 tapcli_main_t *tm = &tapcli_main;
632 if (i < vec_len (tm->show_dev_instance_by_real_dev_instance))
633 show_dev_instance = tm->show_dev_instance_by_real_dev_instance[i];
635 if (show_dev_instance != ~0)
636 i = show_dev_instance;
638 s = format (s, "tapcli-%d", i);
643 * @brief Modify interface flags for TAPCLI interface
645 * @param *vnm - vnet_main_t
646 * @param *hw - vnet_hw_interface_t
653 tapcli_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hw, u32 flags)
655 tapcli_main_t *tm = &tapcli_main;
656 tapcli_interface_t *ti;
658 ti = vec_elt_at_index (tm->tapcli_interfaces, hw->dev_instance);
660 if (flags & ETHERNET_INTERFACE_FLAG_MTU)
662 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
663 tm->mtu_bytes = hw->max_packet_bytes;
664 tm->mtu_buffers = (tm->mtu_bytes + (buffer_size - 1)) / buffer_size;
671 memcpy (&ifr, &ti->ifr, sizeof (ifr));
673 /* get flags, modify to bring up interface... */
674 if (ioctl (ti->provision_fd, SIOCGIFFLAGS, &ifr) < 0)
676 clib_unix_warning ("Couldn't get interface flags for %s", hw->name);
680 want_promisc = (flags & ETHERNET_INTERFACE_FLAG_ACCEPT_ALL) != 0;
682 if (want_promisc == ti->is_promisc)
685 if (flags & ETHERNET_INTERFACE_FLAG_ACCEPT_ALL)
686 ifr.ifr_flags |= IFF_PROMISC;
688 ifr.ifr_flags &= ~(IFF_PROMISC);
690 /* get flags, modify to bring up interface... */
691 if (ioctl (ti->provision_fd, SIOCSIFFLAGS, &ifr) < 0)
693 clib_unix_warning ("Couldn't set interface flags for %s", hw->name);
697 ti->is_promisc = want_promisc;
704 * @brief Setting the TAP interface's next processing node
706 * @param *vnm - vnet_main_t
707 * @param hw_if_index - u32
708 * @param node_index - u32
712 tapcli_set_interface_next_node (vnet_main_t * vnm,
713 u32 hw_if_index, u32 node_index)
715 tapcli_main_t *tm = &tapcli_main;
716 tapcli_interface_t *ti;
717 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
719 ti = vec_elt_at_index (tm->tapcli_interfaces, hw->dev_instance);
721 /** Shut off redirection */
722 if (node_index == ~0)
724 ti->per_interface_next_index = node_index;
728 ti->per_interface_next_index =
729 vlib_node_add_next (tm->vlib_main, tapcli_rx_node.index, node_index);
733 * @brief Set link_state == admin_state otherwise things like ip6 neighbor discovery breaks
735 * @param *vnm - vnet_main_t
736 * @param hw_if_index - u32
739 * @return error - clib_error_t
741 static clib_error_t *
742 tapcli_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
744 uword is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
748 hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP;
752 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
757 VNET_DEVICE_CLASS (tapcli_dev_class,static) = {
759 .tx_function = tapcli_tx,
760 .format_device_name = format_tapcli_interface_name,
761 .rx_redirect_to_node = tapcli_set_interface_next_node,
762 .name_renumber = tap_name_renumber,
763 .admin_up_down_function = tapcli_interface_admin_up_down,
768 * @brief Dump TAP interfaces
770 * @param **out_tapids - tapcli_interface_details_t
776 vnet_tap_dump_ifs (tapcli_interface_details_t ** out_tapids)
778 tapcli_main_t *tm = &tapcli_main;
779 tapcli_interface_t *ti;
781 tapcli_interface_details_t *r_tapids = NULL;
782 tapcli_interface_details_t *tapid = NULL;
784 vec_foreach (ti, tm->tapcli_interfaces)
788 vec_add2 (r_tapids, tapid, 1);
789 tapid->sw_if_index = ti->sw_if_index;
790 strncpy ((char *) tapid->dev_name, ti->ifr.ifr_name,
791 sizeof (ti->ifr.ifr_name) - 1);
794 *out_tapids = r_tapids;
800 * @brief Get tap interface from inactive interfaces or create new
802 * @return interface - tapcli_interface_t
805 static tapcli_interface_t *
806 tapcli_get_new_tapif ()
808 tapcli_main_t *tm = &tapcli_main;
809 tapcli_interface_t *ti = NULL;
811 int inactive_cnt = vec_len (tm->tapcli_inactive_interfaces);
812 // if there are any inactive ifaces
813 if (inactive_cnt > 0)
816 u32 ti_idx = tm->tapcli_inactive_interfaces[inactive_cnt - 1];
817 if (vec_len (tm->tapcli_interfaces) > ti_idx)
819 ti = vec_elt_at_index (tm->tapcli_interfaces, ti_idx);
820 clib_warning ("reusing tap interface");
822 // "remove" from inactive list
823 _vec_len (tm->tapcli_inactive_interfaces) -= 1;
826 // ti was not retrieved from inactive ifaces - create new
828 vec_add2 (tm->tapcli_interfaces, ti, 1);
837 unsigned int ifindex;
841 * @brief Connect a TAP interface
843 * @param vm - vlib_main_t
844 * @param ap - vnet_tap_connect_args_t
850 vnet_tap_connect (vlib_main_t * vm, vnet_tap_connect_args_t * ap)
852 tapcli_main_t *tm = &tapcli_main;
853 tapcli_interface_t *ti = NULL;
864 return VNET_API_ERROR_FEATURE_DISABLED;
867 flags = IFF_TAP | IFF_NO_PI;
869 if ((dev_net_tun_fd = open ("/dev/net/tun", O_RDWR)) < 0)
870 return VNET_API_ERROR_SYSCALL_ERROR_1;
872 clib_memset (&ifr, 0, sizeof (ifr));
873 strncpy (ifr.ifr_name, (char *) ap->intfc_name, sizeof (ifr.ifr_name) - 1);
874 ifr.ifr_flags = flags;
875 if (ioctl (dev_net_tun_fd, TUNSETIFF, (void *) &ifr) < 0)
877 rv = VNET_API_ERROR_SYSCALL_ERROR_2;
881 /* Open a provisioning socket */
882 if ((dev_tap_fd = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0)
884 rv = VNET_API_ERROR_SYSCALL_ERROR_3;
888 /* Find the interface index. */
891 struct sockaddr_ll sll;
893 clib_memset (&ifr, 0, sizeof (ifr));
894 strncpy (ifr.ifr_name, (char *) ap->intfc_name,
895 sizeof (ifr.ifr_name) - 1);
896 if (ioctl (dev_tap_fd, SIOCGIFINDEX, &ifr) < 0)
898 rv = VNET_API_ERROR_SYSCALL_ERROR_4;
902 /* Bind the provisioning socket to the interface. */
903 clib_memset (&sll, 0, sizeof (sll));
904 sll.sll_family = AF_PACKET;
905 sll.sll_ifindex = ifr.ifr_ifindex;
906 sll.sll_protocol = htons (ETH_P_ALL);
908 if (bind (dev_tap_fd, (struct sockaddr *) &sll, sizeof (sll)) < 0)
910 rv = VNET_API_ERROR_SYSCALL_ERROR_5;
915 /* non-blocking I/O on /dev/tapX */
918 if (ioctl (dev_net_tun_fd, FIONBIO, &one) < 0)
920 rv = VNET_API_ERROR_SYSCALL_ERROR_6;
924 ifr.ifr_mtu = tm->mtu_bytes;
925 if (ioctl (dev_tap_fd, SIOCSIFMTU, &ifr) < 0)
927 rv = VNET_API_ERROR_SYSCALL_ERROR_7;
931 /* get flags, modify to bring up interface... */
932 if (ioctl (dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0)
934 rv = VNET_API_ERROR_SYSCALL_ERROR_8;
938 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
940 if (ioctl (dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0)
942 rv = VNET_API_ERROR_SYSCALL_ERROR_9;
946 if (ap->ip4_address_set)
948 struct sockaddr_in sin;
949 /* ip4: mask defaults to /24 */
950 u32 mask = clib_host_to_net_u32 (0xFFFFFF00);
952 clib_memset (&sin, 0, sizeof (sin));
953 sin.sin_family = AF_INET;
954 /* sin.sin_port = 0; */
955 sin.sin_addr.s_addr = ap->ip4_address->as_u32;
956 memcpy (&ifr.ifr_ifru.ifru_addr, &sin, sizeof (sin));
958 if (ioctl (dev_tap_fd, SIOCSIFADDR, &ifr) < 0)
960 rv = VNET_API_ERROR_SYSCALL_ERROR_10;
964 if (ap->ip4_mask_width > 0 && ap->ip4_mask_width < 33)
967 mask <<= (32 - ap->ip4_mask_width);
970 mask = clib_host_to_net_u32 (mask);
971 sin.sin_family = AF_INET;
973 sin.sin_addr.s_addr = mask;
974 memcpy (&ifr.ifr_ifru.ifru_addr, &sin, sizeof (sin));
976 if (ioctl (dev_tap_fd, SIOCSIFNETMASK, &ifr) < 0)
978 rv = VNET_API_ERROR_SYSCALL_ERROR_10;
983 if (ap->ip6_address_set)
989 sockfd6 = socket (AF_INET6, SOCK_DGRAM, IPPROTO_IP);
992 rv = VNET_API_ERROR_SYSCALL_ERROR_10;
996 clib_memset (&ifr2, 0, sizeof (ifr));
997 strncpy (ifr2.ifr_name, (char *) ap->intfc_name,
998 sizeof (ifr2.ifr_name) - 1);
999 if (ioctl (sockfd6, SIOCGIFINDEX, &ifr2) < 0)
1002 rv = VNET_API_ERROR_SYSCALL_ERROR_4;
1006 memcpy (&ifr6.addr, ap->ip6_address, sizeof (ip6_address_t));
1007 ifr6.mask_width = ap->ip6_mask_width;
1008 ifr6.ifindex = ifr2.ifr_ifindex;
1010 if (ioctl (sockfd6, SIOCSIFADDR, &ifr6) < 0)
1013 clib_unix_warning ("ifr6");
1014 rv = VNET_API_ERROR_SYSCALL_ERROR_10;
1020 ti = tapcli_get_new_tapif ();
1021 ti->per_interface_next_index = ~0;
1023 if (ap->hwaddr_arg != 0)
1024 clib_memcpy (hwaddr, ap->hwaddr_arg, 6);
1027 f64 now = vlib_time_now (vm);
1029 rnd = (u32) (now * 1e6);
1030 rnd = random_u32 (&rnd);
1032 memcpy (hwaddr + 2, &rnd, sizeof (rnd));
1037 error = ethernet_register_interface
1039 tapcli_dev_class.index,
1040 ti - tm->tapcli_interfaces /* device instance */ ,
1041 hwaddr /* ethernet address */ ,
1042 &ti->hw_if_index, tapcli_flag_change);
1046 clib_error_report (error);
1047 rv = VNET_API_ERROR_INVALID_REGISTRATION;
1052 clib_file_t template = { 0 };
1053 template.read_function = tapcli_read_ready;
1054 template.file_descriptor = dev_net_tun_fd;
1055 ti->clib_file_index = clib_file_add (&file_main, &template);
1056 ti->unix_fd = dev_net_tun_fd;
1057 ti->provision_fd = dev_tap_fd;
1058 clib_memcpy (&ti->ifr, &ifr, sizeof (ifr));
1062 vnet_hw_interface_t *hw;
1063 hw = vnet_get_hw_interface (tm->vnet_main, ti->hw_if_index);
1064 hw->min_supported_packet_bytes = TAP_MTU_MIN;
1065 hw->max_supported_packet_bytes = TAP_MTU_MAX;
1066 vnet_sw_interface_set_mtu (tm->vnet_main, hw->sw_if_index, 9000);
1067 ti->sw_if_index = hw->sw_if_index;
1068 if (ap->sw_if_indexp)
1069 *(ap->sw_if_indexp) = hw->sw_if_index;
1074 hash_set (tm->tapcli_interface_index_by_sw_if_index, ti->sw_if_index,
1075 ti - tm->tapcli_interfaces);
1077 hash_set (tm->tapcli_interface_index_by_unix_fd, ti->unix_fd,
1078 ti - tm->tapcli_interfaces);
1083 close (dev_net_tun_fd);
1084 if (dev_tap_fd >= 0)
1091 * @brief Renumber a TAP interface
1093 * @param *vm - vlib_main_t
1094 * @param *intfc_name - u8
1095 * @param *hwaddr_arg - u8
1096 * @param *sw_if_indexp - u32
1097 * @param renumber - u8
1098 * @param custom_dev_instance - u32
1104 vnet_tap_connect_renumber (vlib_main_t * vm, vnet_tap_connect_args_t * ap)
1106 int rv = vnet_tap_connect (vm, ap);
1108 if (!rv && ap->renumber)
1109 vnet_interface_name_renumber (*(ap->sw_if_indexp),
1110 ap->custom_dev_instance);
1116 * @brief Disconnect TAP CLI interface
1118 * @param *ti - tapcli_interface_t
1124 tapcli_tap_disconnect (tapcli_interface_t * ti)
1127 vnet_main_t *vnm = vnet_get_main ();
1128 tapcli_main_t *tm = &tapcli_main;
1129 u32 sw_if_index = ti->sw_if_index;
1131 // bring interface down
1132 vnet_sw_interface_set_flags (vnm, sw_if_index, 0);
1134 if (ti->clib_file_index != ~0)
1136 clib_file_del (&file_main, file_main.file_pool + ti->clib_file_index);
1137 ti->clib_file_index = ~0;
1140 close (ti->unix_fd);
1142 hash_unset (tm->tapcli_interface_index_by_unix_fd, ti->unix_fd);
1143 hash_unset (tm->tapcli_interface_index_by_sw_if_index, ti->sw_if_index);
1144 close (ti->provision_fd);
1146 ti->provision_fd = -1;
1152 * @brief Delete TAP interface
1154 * @param *vm - vlib_main_t
1155 * @param sw_if_index - u32
1161 vnet_tap_delete (vlib_main_t * vm, u32 sw_if_index)
1164 tapcli_main_t *tm = &tapcli_main;
1165 tapcli_interface_t *ti;
1168 p = hash_get (tm->tapcli_interface_index_by_sw_if_index, sw_if_index);
1171 clib_warning ("sw_if_index %d unknown", sw_if_index);
1172 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
1174 ti = vec_elt_at_index (tm->tapcli_interfaces, p[0]);
1178 tapcli_tap_disconnect (ti);
1179 // add to inactive list
1180 vec_add1 (tm->tapcli_inactive_interfaces, ti - tm->tapcli_interfaces);
1182 // reset renumbered iface
1183 if (p[0] < vec_len (tm->show_dev_instance_by_real_dev_instance))
1184 tm->show_dev_instance_by_real_dev_instance[p[0]] = ~0;
1186 ethernet_delete_interface (tm->vnet_main, ti->hw_if_index);
1191 * @brief CLI function to delete TAP interface
1193 * @param *vm - vlib_main_t
1194 * @param *input - unformat_input_t
1195 * @param *cmd - vlib_cli_command_t
1197 * @return error - clib_error_t
1200 static clib_error_t *
1201 tap_delete_command_fn (vlib_main_t * vm,
1202 unformat_input_t * input, vlib_cli_command_t * cmd)
1204 tapcli_main_t *tm = &tapcli_main;
1205 u32 sw_if_index = ~0;
1207 if (tm->is_disabled)
1209 return clib_error_return (0, "device disabled...");
1212 if (unformat (input, "%U", unformat_vnet_sw_interface, tm->vnet_main,
1216 return clib_error_return (0, "unknown input `%U'",
1217 format_unformat_error, input);
1220 int rc = vnet_tap_delete (vm, sw_if_index);
1224 vlib_cli_output (vm, "Deleted.");
1228 vlib_cli_output (vm, "Error during deletion of tap interface. (rc: %d)",
1236 VLIB_CLI_COMMAND (tap_delete_command, static) = {
1237 .path = "tap delete",
1238 .short_help = "tap delete <vpp-tap-intfc-name>",
1239 .function = tap_delete_command_fn,
1244 * @brief Modifies tap interface - can result in new interface being created
1246 * @param *vm - vlib_main_t
1247 * @param orig_sw_if_index - u32
1248 * @param *intfc_name - u8
1249 * @param *hwaddr_arg - u8
1250 * @param *sw_if_indexp - u32
1251 * @param renumber - u8
1252 * @param custom_dev_instance - u32
1258 vnet_tap_modify (vlib_main_t * vm, vnet_tap_connect_args_t * ap)
1260 int rv = vnet_tap_delete (vm, ap->orig_sw_if_index);
1265 rv = vnet_tap_connect_renumber (vm, ap);
1271 * @brief CLI function to modify TAP interface
1273 * @param *vm - vlib_main_t
1274 * @param *input - unformat_input_t
1275 * @param *cmd - vlib_cli_command_t
1277 * @return error - clib_error_t
1280 static clib_error_t *
1281 tap_modify_command_fn (vlib_main_t * vm,
1282 unformat_input_t * input, vlib_cli_command_t * cmd)
1285 tapcli_main_t *tm = &tapcli_main;
1286 u32 sw_if_index = ~0;
1287 u32 new_sw_if_index = ~0;
1288 int user_hwaddr = 0;
1290 vnet_tap_connect_args_t _a, *ap = &_a;
1292 if (tm->is_disabled)
1294 return clib_error_return (0, "device disabled...");
1297 if (unformat (input, "%U", unformat_vnet_sw_interface, tm->vnet_main,
1301 return clib_error_return (0, "unknown input `%U'",
1302 format_unformat_error, input);
1304 if (unformat (input, "%s", &intfc_name))
1307 return clib_error_return (0, "unknown input `%U'",
1308 format_unformat_error, input);
1310 if (unformat (input, "hwaddr %U", unformat_ethernet_address, &hwaddr))
1314 clib_memset (ap, 0, sizeof (*ap));
1315 ap->orig_sw_if_index = sw_if_index;
1316 ap->intfc_name = intfc_name;
1317 ap->sw_if_indexp = &new_sw_if_index;
1319 ap->hwaddr_arg = hwaddr;
1321 int rc = vnet_tap_modify (vm, ap);
1325 vlib_cli_output (vm, "Modified %U for Linux tap '%s'",
1326 format_vnet_sw_if_index_name, tm->vnet_main,
1327 *(ap->sw_if_indexp), ap->intfc_name);
1331 vlib_cli_output (vm,
1332 "Error during modification of tap interface. (rc: %d)",
1340 VLIB_CLI_COMMAND (tap_modify_command, static) = {
1341 .path = "tap modify",
1342 .short_help = "tap modify <vpp-tap-intfc-name> <linux-intfc-name> [hwaddr <addr>]",
1343 .function = tap_modify_command_fn,
1348 * @brief CLI function to connect TAP interface
1350 * @param *vm - vlib_main_t
1351 * @param *input - unformat_input_t
1352 * @param *cmd - vlib_cli_command_t
1354 * @return error - clib_error_t
1357 static clib_error_t *
1358 tap_connect_command_fn (vlib_main_t * vm,
1359 unformat_input_t * input, vlib_cli_command_t * cmd)
1362 unformat_input_t _line_input, *line_input = &_line_input;
1363 vnet_tap_connect_args_t _a, *ap = &_a;
1364 tapcli_main_t *tm = &tapcli_main;
1368 ip4_address_t ip4_address;
1369 int ip4_address_set = 0;
1370 ip6_address_t ip6_address;
1371 int ip6_address_set = 0;
1372 u32 ip4_mask_width = 0;
1373 u32 ip6_mask_width = 0;
1374 clib_error_t *error = NULL;
1376 if (tm->is_disabled)
1377 return clib_error_return (0, "device disabled...");
1379 if (!unformat_user (input, unformat_line_input, line_input))
1382 while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
1384 if (unformat (line_input, "hwaddr %U", unformat_ethernet_address,
1386 hwaddr_arg = hwaddr;
1388 /* It is here for backward compatibility */
1389 else if (unformat (line_input, "hwaddr random"))
1392 else if (unformat (line_input, "address %U/%d",
1393 unformat_ip4_address, &ip4_address, &ip4_mask_width))
1394 ip4_address_set = 1;
1396 else if (unformat (line_input, "address %U/%d",
1397 unformat_ip6_address, &ip6_address, &ip6_mask_width))
1398 ip6_address_set = 1;
1400 else if (unformat (line_input, "%s", &intfc_name))
1404 error = clib_error_return (0, "unknown input `%U'",
1405 format_unformat_error, line_input);
1410 if (intfc_name == 0)
1412 error = clib_error_return (0, "interface name must be specified");
1416 clib_memset (ap, 0, sizeof (*ap));
1418 ap->intfc_name = intfc_name;
1419 ap->hwaddr_arg = hwaddr_arg;
1420 if (ip4_address_set)
1422 ap->ip4_address = &ip4_address;
1423 ap->ip4_mask_width = ip4_mask_width;
1424 ap->ip4_address_set = 1;
1426 if (ip6_address_set)
1428 ap->ip6_address = &ip6_address;
1429 ap->ip6_mask_width = ip6_mask_width;
1430 ap->ip6_address_set = 1;
1433 ap->sw_if_indexp = &sw_if_index;
1435 int rv = vnet_tap_connect (vm, ap);
1439 case VNET_API_ERROR_SYSCALL_ERROR_1:
1440 error = clib_error_return (0, "Couldn't open /dev/net/tun");
1443 case VNET_API_ERROR_SYSCALL_ERROR_2:
1445 clib_error_return (0, "Error setting flags on '%s'", intfc_name);
1448 case VNET_API_ERROR_SYSCALL_ERROR_3:
1449 error = clib_error_return (0, "Couldn't open provisioning socket");
1452 case VNET_API_ERROR_SYSCALL_ERROR_4:
1453 error = clib_error_return (0, "Couldn't get if_index");
1456 case VNET_API_ERROR_SYSCALL_ERROR_5:
1457 error = clib_error_return (0, "Couldn't bind provisioning socket");
1460 case VNET_API_ERROR_SYSCALL_ERROR_6:
1461 error = clib_error_return (0, "Couldn't set device non-blocking flag");
1464 case VNET_API_ERROR_SYSCALL_ERROR_7:
1465 error = clib_error_return (0, "Couldn't set device MTU");
1468 case VNET_API_ERROR_SYSCALL_ERROR_8:
1469 error = clib_error_return (0, "Couldn't get interface flags");
1472 case VNET_API_ERROR_SYSCALL_ERROR_9:
1473 error = clib_error_return (0, "Couldn't set intfc admin state up");
1476 case VNET_API_ERROR_SYSCALL_ERROR_10:
1477 error = clib_error_return (0, "Couldn't set intfc address/mask");
1480 case VNET_API_ERROR_INVALID_REGISTRATION:
1481 error = clib_error_return (0, "Invalid registration");
1488 error = clib_error_return (0, "Unknown error: %d", rv);
1492 vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name,
1493 vnet_get_main (), sw_if_index);
1496 unformat_free (line_input);
1502 VLIB_CLI_COMMAND (tap_connect_command, static) = {
1503 .path = "tap connect",
1505 "tap connect <intfc-name> [address <ip-addr>/mw] [hwaddr <addr>]",
1506 .function = tap_connect_command_fn,
1511 * @brief TAPCLI main init
1513 * @param *vm - vlib_main_t
1515 * @return error - clib_error_t
1519 tapcli_init (vlib_main_t * vm)
1521 tapcli_main_t *tm = &tapcli_main;
1522 vlib_thread_main_t *m = vlib_get_thread_main ();
1523 tapcli_per_thread_t *thread;
1526 tm->vnet_main = vnet_get_main ();
1527 tm->mtu_bytes = TAP_MTU_DEFAULT;
1528 tm->tapcli_interface_index_by_sw_if_index = hash_create (0, sizeof (uword));
1529 tm->tapcli_interface_index_by_unix_fd = hash_create (0, sizeof (uword));
1530 vm->os_punt_frame = tapcli_nopunt_frame;
1531 vec_validate_aligned (tm->threads, m->n_vlib_mains - 1,
1532 CLIB_CACHE_LINE_BYTES);
1533 vec_foreach (thread, tm->threads)
1536 thread->rx_buffers = 0;
1537 vec_alloc (thread->rx_buffers, VLIB_FRAME_SIZE);
1538 vec_reset_length (thread->rx_buffers);
1544 VLIB_INIT_FUNCTION (tapcli_init);
1547 * fd.io coding-style-patch-verification: ON
1550 * eval: (c-set-style "gnu")