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/tapcli.h>
46 static vnet_device_class_t tapcli_dev_class;
47 static vnet_hw_interface_class_t tapcli_interface_class;
48 static vlib_node_registration_t tapcli_rx_node;
50 static void tapcli_nopunt_frame (vlib_main_t * vm,
51 vlib_node_runtime_t * node,
52 vlib_frame_t * frame);
54 * @brief Struct for the tapcli interface
65 u32 per_interface_next_index;
71 * @brief Struct for RX trace
78 * @brief Function to format TAP CLI trace
80 * @param *s - u8 - formatting string
81 * @param *va - va_list
83 * @return *s - u8 - formatted string
86 u8 * format_tapcli_rx_trace (u8 * s, va_list * va)
88 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
89 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
90 vnet_main_t * vnm = vnet_get_main();
91 tapcli_rx_trace_t * t = va_arg (*va, tapcli_rx_trace_t *);
92 s = format (s, "%U", format_vnet_sw_if_index_name,
98 * @brief TAPCLI main state struct
101 /** Vector of iovecs for readv/writev calls. */
102 struct iovec * iovecs;
104 /** Vector of VLIB rx buffers to use. We allocate them in blocks
105 of VLIB_FRAME_SIZE (256). */
108 /** tap device destination MAC address. Required, or Linux drops pkts */
111 /** Interface MTU in bytes and # of default sized buffers. */
112 u32 mtu_bytes, mtu_buffers;
114 /** Vector of tap interfaces */
115 tapcli_interface_t * tapcli_interfaces;
117 /** Vector of deleted tap interfaces */
118 u32 * tapcli_inactive_interfaces;
120 /** Bitmap of tap interfaces with pending reads */
121 uword * pending_read_bitmap;
123 /** Hash table to find tapcli interface given hw_if_index */
124 uword * tapcli_interface_index_by_sw_if_index;
126 /** Hash table to find tapcli interface given unix fd */
127 uword * tapcli_interface_index_by_unix_fd;
129 /** renumbering table */
130 u32 * show_dev_instance_by_real_dev_instance;
132 /** 1 => disable CLI */
135 /** convenience - vlib_main_t */
136 vlib_main_t * vlib_main;
137 /** convenience - vnet_main_t */
138 vnet_main_t * vnet_main;
139 /** convenience - unix_main_t */
140 unix_main_t * unix_main;
143 static tapcli_main_t tapcli_main;
146 * @brief tapcli TX node function
149 * Output node, writes the buffers comprising the incoming frame
150 * to the tun/tap device, aka hands them to the Linux kernel stack.
152 * @param *vm - vlib_main_t
153 * @param *node - vlib_node_runtime_t
154 * @param *frame - vlib_frame_t
156 * @return n_packets - uword
160 tapcli_tx (vlib_main_t * vm,
161 vlib_node_runtime_t * node,
162 vlib_frame_t * frame)
164 u32 * buffers = vlib_frame_args (frame);
165 uword n_packets = frame->n_vectors;
166 tapcli_main_t * tm = &tapcli_main;
167 tapcli_interface_t * ti;
170 for (i = 0; i < n_packets; i++)
175 vnet_hw_interface_t * hw;
179 b = vlib_get_buffer (vm, buffers[i]);
181 tx_sw_if_index = vnet_buffer(b)->sw_if_index[VLIB_TX];
182 if (tx_sw_if_index == (u32)~0)
183 tx_sw_if_index = vnet_buffer(b)->sw_if_index[VLIB_RX];
185 ASSERT(tx_sw_if_index != (u32)~0);
187 /* Use the sup intfc to finesse vlan subifs */
188 hw = vnet_get_sup_hw_interface (tm->vnet_main, tx_sw_if_index);
189 tx_sw_if_index = hw->sw_if_index;
191 p = hash_get (tm->tapcli_interface_index_by_sw_if_index,
195 clib_warning ("sw_if_index %d unknown", tx_sw_if_index);
196 /* $$$ leak, but this should never happen... */
200 ti = vec_elt_at_index (tm->tapcli_interfaces, p[0]);
202 /* Re-set iovecs if present. */
204 _vec_len (tm->iovecs) = 0;
206 /* VLIB buffer chain -> Unix iovec(s). */
207 vec_add2 (tm->iovecs, iov, 1);
208 iov->iov_base = b->data + b->current_data;
209 iov->iov_len = l = b->current_length;
211 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
214 b = vlib_get_buffer (vm, b->next_buffer);
216 vec_add2 (tm->iovecs, iov, 1);
218 iov->iov_base = b->data + b->current_data;
219 iov->iov_len = b->current_length;
220 l += b->current_length;
221 } while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
224 if (writev (ti->unix_fd, tm->iovecs, vec_len (tm->iovecs)) < l)
225 clib_unix_warning ("writev");
228 vlib_buffer_free(vm, vlib_frame_vector_args(frame), frame->n_vectors);
233 VLIB_REGISTER_NODE (tapcli_tx_node,static) = {
234 .function = tapcli_tx,
236 .type = VLIB_NODE_TYPE_INTERNAL,
241 * @brief Dispatch tapcli RX node function for node tap_cli_rx
244 * @param *vm - vlib_main_t
245 * @param *node - vlib_node_runtime_t
246 * @param *ti - tapcli_interface_t
248 * @return n_packets - uword
251 static uword tapcli_rx_iface(vlib_main_t * vm,
252 vlib_node_runtime_t * node,
253 tapcli_interface_t * ti)
255 tapcli_main_t * tm = &tapcli_main;
256 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
257 u32 n_trace = vlib_get_trace_count (vm, node);
261 vnet_sw_interface_t * si;
263 u32 next = node->cached_next_index;
264 u32 n_left_to_next, next_index;
267 vnm = vnet_get_main();
268 si = vnet_get_sw_interface (vnm, ti->sw_if_index);
269 admin_down = !(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP);
271 vlib_get_next_frame(vm, node, next, to_next, n_left_to_next);
273 while (n_left_to_next) { // Fill at most one vector
274 vlib_buffer_t *b_first, *b, *prev;
276 word n_bytes_in_packet;
279 if (PREDICT_FALSE(vec_len(tm->rx_buffers) < tm->mtu_buffers)) {
280 uword len = vec_len(tm->rx_buffers);
281 _vec_len(tm->rx_buffers) +=
282 vlib_buffer_alloc_from_free_list(vm, &tm->rx_buffers[len],
283 VLIB_FRAME_SIZE - len, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
284 if (PREDICT_FALSE(vec_len(tm->rx_buffers) < tm->mtu_buffers)) {
285 vlib_node_increment_counter(vm, tapcli_rx_node.index,
286 TAPCLI_ERROR_BUFFER_ALLOC,
287 tm->mtu_buffers - vec_len(tm->rx_buffers));
292 uword i_rx = vec_len (tm->rx_buffers) - 1;
294 /* Allocate RX buffers from end of rx_buffers.
295 Turn them into iovecs to pass to readv. */
296 vec_validate (tm->iovecs, tm->mtu_buffers - 1);
297 for (j = 0; j < tm->mtu_buffers; j++) {
298 b = vlib_get_buffer (vm, tm->rx_buffers[i_rx - j]);
299 tm->iovecs[j].iov_base = b->data;
300 tm->iovecs[j].iov_len = buffer_size;
303 n_bytes_left = readv (ti->unix_fd, tm->iovecs, tm->mtu_buffers);
304 n_bytes_in_packet = n_bytes_left;
305 if (n_bytes_left <= 0) {
306 if (errno != EAGAIN) {
307 vlib_node_increment_counter(vm, tapcli_rx_node.index,
308 TAPCLI_ERROR_READ, 1);
313 bi_first = tm->rx_buffers[i_rx];
314 b = b_first = vlib_get_buffer (vm, tm->rx_buffers[i_rx]);
318 b->current_length = n_bytes_left < buffer_size ? n_bytes_left : buffer_size;
319 n_bytes_left -= buffer_size;
322 prev->next_buffer = bi;
323 prev->flags |= VLIB_BUFFER_NEXT_PRESENT;
328 if (n_bytes_left <= 0)
332 bi = tm->rx_buffers[i_rx];
333 b = vlib_get_buffer (vm, bi);
336 _vec_len (tm->rx_buffers) = i_rx;
338 b_first->total_length_not_including_first_buffer =
339 (n_bytes_in_packet > buffer_size) ? n_bytes_in_packet - buffer_size : 0;
340 b_first->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
342 VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b_first);
344 vnet_buffer (b_first)->sw_if_index[VLIB_RX] = ti->sw_if_index;
345 vnet_buffer (b_first)->sw_if_index[VLIB_TX] = (u32)~0;
347 b_first->error = node->errors[TAPCLI_ERROR_NONE];
348 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
349 next_index = (ti->per_interface_next_index != ~0) ?
350 ti->per_interface_next_index : next_index;
351 next_index = admin_down ? VNET_DEVICE_INPUT_NEXT_DROP : next_index;
353 to_next[0] = bi_first;
357 vnet_feature_start_device_input_x1 (ti->sw_if_index, &next_index,
360 vlib_validate_buffer_enqueue_x1 (vm, node, next,
361 to_next, n_left_to_next,
362 bi_first, next_index);
364 /* Interface counters for tapcli interface. */
365 if (PREDICT_TRUE(!admin_down)) {
366 vlib_increment_combined_counter (
367 vnet_main.interface_main.combined_sw_if_counters
368 + VNET_INTERFACE_COUNTER_RX,
369 os_get_cpu_number(), ti->sw_if_index,
370 1, n_bytes_in_packet);
372 if (PREDICT_FALSE(n_trace > 0)) {
373 vlib_trace_buffer (vm, node, next_index,
374 b_first, /* follow_chain */ 1);
377 tapcli_rx_trace_t *t0 = vlib_add_trace (vm, node, b_first, sizeof (*t0));
378 t0->sw_if_index = si->sw_if_index;
382 vlib_put_next_frame (vm, node, next, n_left_to_next);
384 vlib_set_trace_count (vm, node, n_trace);
385 return VLIB_FRAME_SIZE - n_left_to_next;
389 * @brief tapcli RX node function
392 * Input node from the Kernel tun/tap device
394 * @param *vm - vlib_main_t
395 * @param *node - vlib_node_runtime_t
396 * @param *frame - vlib_frame_t
398 * @return n_packets - uword
402 tapcli_rx (vlib_main_t * vm,
403 vlib_node_runtime_t * node,
404 vlib_frame_t * frame)
406 tapcli_main_t * tm = &tapcli_main;
407 static u32 * ready_interface_indices;
408 tapcli_interface_t * ti;
412 vec_reset_length (ready_interface_indices);
413 clib_bitmap_foreach (i, tm->pending_read_bitmap,
415 vec_add1 (ready_interface_indices, i);
418 if (vec_len (ready_interface_indices) == 0)
421 for (i = 0; i < vec_len(ready_interface_indices); i++)
423 tm->pending_read_bitmap =
424 clib_bitmap_set (tm->pending_read_bitmap,
425 ready_interface_indices[i], 0);
427 ti = vec_elt_at_index (tm->tapcli_interfaces, ready_interface_indices[i]);
428 total_count += tapcli_rx_iface(vm, node, ti);
430 return total_count; //This might return more than 256.
433 /** TAPCLI error strings */
434 static char * tapcli_rx_error_strings[] = {
435 #define _(sym,string) string,
440 VLIB_REGISTER_NODE (tapcli_rx_node, static) = {
441 .function = tapcli_rx,
443 .sibling_of = "device-input",
444 .type = VLIB_NODE_TYPE_INPUT,
445 .state = VLIB_NODE_STATE_INTERRUPT,
447 .n_errors = TAPCLI_N_ERROR,
448 .error_strings = tapcli_rx_error_strings,
449 .format_trace = format_tapcli_rx_trace,
454 * @brief Gets called when file descriptor is ready from epoll.
456 * @param *uf - unix_file_t
458 * @return error - clib_error_t
461 static clib_error_t * tapcli_read_ready (unix_file_t * uf)
463 vlib_main_t * vm = vlib_get_main();
464 tapcli_main_t * tm = &tapcli_main;
467 /** Schedule the rx node */
468 vlib_node_set_interrupt_pending (vm, tapcli_rx_node.index);
470 p = hash_get (tm->tapcli_interface_index_by_unix_fd, uf->file_descriptor);
472 /** Mark the specific tap interface ready-to-read */
474 tm->pending_read_bitmap = clib_bitmap_set (tm->pending_read_bitmap,
477 clib_warning ("fd %d not in hash table", uf->file_descriptor);
483 * @brief CLI function for TAPCLI configuration
485 * @param *vm - vlib_main_t
486 * @param *input - unformat_input_t
488 * @return error - clib_error_t
491 static clib_error_t *
492 tapcli_config (vlib_main_t * vm, unformat_input_t * input)
494 tapcli_main_t *tm = &tapcli_main;
495 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
497 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
499 if (unformat (input, "mtu %d", &tm->mtu_bytes))
501 else if (unformat (input, "disable"))
504 return clib_error_return (0, "unknown input `%U'",
505 format_unformat_error, input);
513 clib_warning ("tapcli disabled: must be superuser");
518 tm->mtu_buffers = (tm->mtu_bytes + (buffer_size - 1)) / buffer_size;
524 * @brief Renumber TAPCLI interface
526 * @param *hi - vnet_hw_interface_t
527 * @param new_dev_instance - u32
532 static int tap_name_renumber (vnet_hw_interface_t * hi,
533 u32 new_dev_instance)
535 tapcli_main_t *tm = &tapcli_main;
537 vec_validate_init_empty (tm->show_dev_instance_by_real_dev_instance,
538 hi->dev_instance, ~0);
540 tm->show_dev_instance_by_real_dev_instance [hi->dev_instance] =
546 VLIB_CONFIG_FUNCTION (tapcli_config, "tapcli");
549 * @brief Free "no punt" frame
551 * @param *vm - vlib_main_t
552 * @param *node - vlib_node_runtime_t
553 * @param *frame - vlib_frame_t
557 tapcli_nopunt_frame (vlib_main_t * vm,
558 vlib_node_runtime_t * node,
559 vlib_frame_t * frame)
561 u32 * buffers = vlib_frame_args (frame);
562 uword n_packets = frame->n_vectors;
563 vlib_buffer_free (vm, buffers, n_packets);
564 vlib_frame_free (vm, node, frame);
567 VNET_HW_INTERFACE_CLASS (tapcli_interface_class,static) = {
569 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
573 * @brief Formatter for TAPCLI interface name
575 * @param *s - formatter string
576 * @param *args - va_list
578 * @return *s - formatted string
581 static u8 * format_tapcli_interface_name (u8 * s, va_list * args)
583 u32 i = va_arg (*args, u32);
584 u32 show_dev_instance = ~0;
585 tapcli_main_t * tm = &tapcli_main;
587 if (i < vec_len (tm->show_dev_instance_by_real_dev_instance))
588 show_dev_instance = tm->show_dev_instance_by_real_dev_instance[i];
590 if (show_dev_instance != ~0)
591 i = show_dev_instance;
593 s = format (s, "tap-%d", i);
598 * @brief Modify interface flags for TAPCLI interface
600 * @param *vnm - vnet_main_t
601 * @param *hw - vnet_hw_interface_t
607 static u32 tapcli_flag_change (vnet_main_t * vnm,
608 vnet_hw_interface_t * hw,
611 tapcli_main_t *tm = &tapcli_main;
612 tapcli_interface_t *ti;
614 ti = vec_elt_at_index (tm->tapcli_interfaces, hw->dev_instance);
616 if (flags & ETHERNET_INTERFACE_FLAG_MTU)
618 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
619 tm->mtu_bytes = hw->max_packet_bytes;
620 tm->mtu_buffers = (tm->mtu_bytes + (buffer_size - 1)) / buffer_size;
627 memcpy (&ifr, &ti->ifr, sizeof (ifr));
629 /* get flags, modify to bring up interface... */
630 if (ioctl (ti->provision_fd, SIOCGIFFLAGS, &ifr) < 0)
632 clib_unix_warning ("Couldn't get interface flags for %s", hw->name);
636 want_promisc = (flags & ETHERNET_INTERFACE_FLAG_ACCEPT_ALL) != 0;
638 if (want_promisc == ti->is_promisc)
641 if (flags & ETHERNET_INTERFACE_FLAG_ACCEPT_ALL)
642 ifr.ifr_flags |= IFF_PROMISC;
644 ifr.ifr_flags &= ~(IFF_PROMISC);
646 /* get flags, modify to bring up interface... */
647 if (ioctl (ti->provision_fd, SIOCSIFFLAGS, &ifr) < 0)
649 clib_unix_warning ("Couldn't set interface flags for %s", hw->name);
653 ti->is_promisc = want_promisc;
660 * @brief Setting the TAP interface's next processing node
662 * @param *vnm - vnet_main_t
663 * @param hw_if_index - u32
664 * @param node_index - u32
667 static void tapcli_set_interface_next_node (vnet_main_t *vnm,
671 tapcli_main_t *tm = &tapcli_main;
672 tapcli_interface_t *ti;
673 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
675 ti = vec_elt_at_index (tm->tapcli_interfaces, hw->dev_instance);
677 /** Shut off redirection */
678 if (node_index == ~0)
680 ti->per_interface_next_index = node_index;
684 ti->per_interface_next_index =
685 vlib_node_add_next (tm->vlib_main, tapcli_rx_node.index, node_index);
689 * @brief Set link_state == admin_state otherwise things like ip6 neighbor discovery breaks
691 * @param *vnm - vnet_main_t
692 * @param hw_if_index - u32
695 * @return error - clib_error_t
697 static clib_error_t *
698 tapcli_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
700 uword is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
702 u32 speed_duplex = VNET_HW_INTERFACE_FLAG_FULL_DUPLEX
703 | VNET_HW_INTERFACE_FLAG_SPEED_1G;
706 hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP | speed_duplex;
708 hw_flags = speed_duplex;
710 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
714 VNET_DEVICE_CLASS (tapcli_dev_class,static) = {
716 .tx_function = tapcli_tx,
717 .format_device_name = format_tapcli_interface_name,
718 .rx_redirect_to_node = tapcli_set_interface_next_node,
719 .name_renumber = tap_name_renumber,
720 .admin_up_down_function = tapcli_interface_admin_up_down,
724 * @brief Dump TAP interfaces
726 * @param **out_tapids - tapcli_interface_details_t
731 int vnet_tap_dump_ifs (tapcli_interface_details_t **out_tapids)
733 tapcli_main_t * tm = &tapcli_main;
734 tapcli_interface_t * ti;
736 tapcli_interface_details_t * r_tapids = NULL;
737 tapcli_interface_details_t * tapid = NULL;
739 vec_foreach (ti, tm->tapcli_interfaces) {
742 vec_add2(r_tapids, tapid, 1);
743 tapid->sw_if_index = ti->sw_if_index;
744 strncpy((char *)tapid->dev_name, ti->ifr.ifr_name, sizeof (ti->ifr.ifr_name)-1);
747 *out_tapids = r_tapids;
753 * @brief Get tap interface from inactive interfaces or create new
755 * @return interface - tapcli_interface_t
758 static tapcli_interface_t *tapcli_get_new_tapif()
760 tapcli_main_t * tm = &tapcli_main;
761 tapcli_interface_t *ti = NULL;
763 int inactive_cnt = vec_len(tm->tapcli_inactive_interfaces);
764 // if there are any inactive ifaces
765 if (inactive_cnt > 0) {
767 u32 ti_idx = tm->tapcli_inactive_interfaces[inactive_cnt - 1];
768 if (vec_len(tm->tapcli_interfaces) > ti_idx) {
769 ti = vec_elt_at_index (tm->tapcli_interfaces, ti_idx);
770 clib_warning("reusing tap interface");
772 // "remove" from inactive list
773 _vec_len(tm->tapcli_inactive_interfaces) -= 1;
776 // ti was not retrieved from inactive ifaces - create new
778 vec_add2 (tm->tapcli_interfaces, ti, 1);
784 * @brief Connect a TAP interface
786 * @param vm - vlib_main_t
787 * @param intfc_name - u8
788 * @param hwaddr_arg - u8
789 * @param sw_if_indexp - u32
794 int vnet_tap_connect (vlib_main_t * vm, u8 * intfc_name, u8 *hwaddr_arg,
797 tapcli_main_t * tm = &tapcli_main;
798 tapcli_interface_t * ti = NULL;
803 clib_error_t * error;
809 return VNET_API_ERROR_FEATURE_DISABLED;
812 flags = IFF_TAP | IFF_NO_PI;
814 if ((dev_net_tun_fd = open ("/dev/net/tun", O_RDWR)) < 0)
815 return VNET_API_ERROR_SYSCALL_ERROR_1;
817 memset (&ifr, 0, sizeof (ifr));
818 strncpy(ifr.ifr_name, (char *) intfc_name, sizeof (ifr.ifr_name)-1);
819 ifr.ifr_flags = flags;
820 if (ioctl (dev_net_tun_fd, TUNSETIFF, (void *)&ifr) < 0)
822 rv = VNET_API_ERROR_SYSCALL_ERROR_2;
826 /* Open a provisioning socket */
827 if ((dev_tap_fd = socket(PF_PACKET, SOCK_RAW,
828 htons(ETH_P_ALL))) < 0 )
830 rv = VNET_API_ERROR_SYSCALL_ERROR_3;
834 /* Find the interface index. */
837 struct sockaddr_ll sll;
839 memset (&ifr, 0, sizeof(ifr));
840 strncpy (ifr.ifr_name, (char *) intfc_name, sizeof (ifr.ifr_name)-1);
841 if (ioctl (dev_tap_fd, SIOCGIFINDEX, &ifr) < 0 )
843 rv = VNET_API_ERROR_SYSCALL_ERROR_4;
847 /* Bind the provisioning socket to the interface. */
848 memset(&sll, 0, sizeof(sll));
849 sll.sll_family = AF_PACKET;
850 sll.sll_ifindex = ifr.ifr_ifindex;
851 sll.sll_protocol = htons(ETH_P_ALL);
853 if (bind(dev_tap_fd, (struct sockaddr*) &sll, sizeof(sll)) < 0)
855 rv = VNET_API_ERROR_SYSCALL_ERROR_5;
860 /* non-blocking I/O on /dev/tapX */
863 if (ioctl (dev_net_tun_fd, FIONBIO, &one) < 0)
865 rv = VNET_API_ERROR_SYSCALL_ERROR_6;
869 ifr.ifr_mtu = tm->mtu_bytes;
870 if (ioctl (dev_tap_fd, SIOCSIFMTU, &ifr) < 0)
872 rv = VNET_API_ERROR_SYSCALL_ERROR_7;
876 /* get flags, modify to bring up interface... */
877 if (ioctl (dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0)
879 rv = VNET_API_ERROR_SYSCALL_ERROR_8;
883 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
885 if (ioctl (dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0)
887 rv = VNET_API_ERROR_SYSCALL_ERROR_9;
891 ti = tapcli_get_new_tapif();
892 ti->per_interface_next_index = ~0;
895 clib_memcpy(hwaddr, hwaddr_arg, 6);
898 f64 now = vlib_time_now(vm);
900 rnd = (u32) (now * 1e6);
901 rnd = random_u32 (&rnd);
903 memcpy (hwaddr+2, &rnd, sizeof(rnd));
908 error = ethernet_register_interface
910 tapcli_dev_class.index,
911 ti - tm->tapcli_interfaces /* device instance */,
912 hwaddr /* ethernet address */,
918 clib_error_report (error);
919 rv = VNET_API_ERROR_INVALID_REGISTRATION;
924 unix_file_t template = {0};
925 template.read_function = tapcli_read_ready;
926 template.file_descriptor = dev_net_tun_fd;
927 ti->unix_file_index = unix_file_add (&unix_main, &template);
928 ti->unix_fd = dev_net_tun_fd;
929 ti->provision_fd = dev_tap_fd;
930 clib_memcpy (&ti->ifr, &ifr, sizeof (ifr));
934 vnet_hw_interface_t * hw;
935 hw = vnet_get_hw_interface (tm->vnet_main, ti->hw_if_index);
936 hw->min_supported_packet_bytes = TAP_MTU_MIN;
937 hw->max_supported_packet_bytes = TAP_MTU_MAX;
938 hw->max_l3_packet_bytes[VLIB_RX] = hw->max_l3_packet_bytes[VLIB_TX] = hw->max_supported_packet_bytes - sizeof(ethernet_header_t);
939 ti->sw_if_index = hw->sw_if_index;
941 *sw_if_indexp = hw->sw_if_index;
946 hash_set (tm->tapcli_interface_index_by_sw_if_index, ti->sw_if_index,
947 ti - tm->tapcli_interfaces);
949 hash_set (tm->tapcli_interface_index_by_unix_fd, ti->unix_fd,
950 ti - tm->tapcli_interfaces);
955 close (dev_net_tun_fd);
963 * @brief Renumber a TAP interface
965 * @param *vm - vlib_main_t
966 * @param *intfc_name - u8
967 * @param *hwaddr_arg - u8
968 * @param *sw_if_indexp - u32
969 * @param renumber - u8
970 * @param custom_dev_instance - u32
975 int vnet_tap_connect_renumber (vlib_main_t * vm, u8 * intfc_name,
976 u8 *hwaddr_arg, u32 * sw_if_indexp,
977 u8 renumber, u32 custom_dev_instance)
979 int rv = vnet_tap_connect(vm, intfc_name, hwaddr_arg, sw_if_indexp);
982 vnet_interface_name_renumber (*sw_if_indexp, custom_dev_instance);
988 * @brief Disconnect TAP CLI interface
990 * @param *ti - tapcli_interface_t
995 static int tapcli_tap_disconnect (tapcli_interface_t *ti)
998 vnet_main_t * vnm = vnet_get_main();
999 tapcli_main_t * tm = &tapcli_main;
1000 u32 sw_if_index = ti->sw_if_index;
1002 // bring interface down
1003 vnet_sw_interface_set_flags (vnm, sw_if_index, 0);
1005 if (ti->unix_file_index != ~0) {
1006 unix_file_del (&unix_main, unix_main.file_pool + ti->unix_file_index);
1007 ti->unix_file_index = ~0;
1012 hash_unset (tm->tapcli_interface_index_by_unix_fd, ti->unix_fd);
1013 hash_unset (tm->tapcli_interface_index_by_sw_if_index, ti->sw_if_index);
1014 close(ti->provision_fd);
1016 ti->provision_fd = -1;
1022 * @brief Delete TAP interface
1024 * @param *vm - vlib_main_t
1025 * @param sw_if_index - u32
1030 int vnet_tap_delete(vlib_main_t *vm, u32 sw_if_index)
1033 tapcli_main_t * tm = &tapcli_main;
1034 tapcli_interface_t *ti;
1037 p = hash_get (tm->tapcli_interface_index_by_sw_if_index,
1040 clib_warning ("sw_if_index %d unknown", sw_if_index);
1041 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
1043 ti = vec_elt_at_index (tm->tapcli_interfaces, p[0]);
1047 tapcli_tap_disconnect(ti);
1048 // add to inactive list
1049 vec_add1(tm->tapcli_inactive_interfaces, ti - tm->tapcli_interfaces);
1051 // reset renumbered iface
1052 if (p[0] < vec_len (tm->show_dev_instance_by_real_dev_instance))
1053 tm->show_dev_instance_by_real_dev_instance[p[0]] = ~0;
1055 ethernet_delete_interface (tm->vnet_main, ti->hw_if_index);
1060 * @brief CLI function to delete TAP interface
1062 * @param *vm - vlib_main_t
1063 * @param *input - unformat_input_t
1064 * @param *cmd - vlib_cli_command_t
1066 * @return error - clib_error_t
1069 static clib_error_t *
1070 tap_delete_command_fn (vlib_main_t * vm,
1071 unformat_input_t * input,
1072 vlib_cli_command_t * cmd)
1074 tapcli_main_t * tm = &tapcli_main;
1075 u32 sw_if_index = ~0;
1077 if (tm->is_disabled)
1079 return clib_error_return (0, "device disabled...");
1082 if (unformat (input, "%U", unformat_vnet_sw_interface, tm->vnet_main,
1086 return clib_error_return (0, "unknown input `%U'",
1087 format_unformat_error, input);
1090 int rc = vnet_tap_delete (vm, sw_if_index);
1093 vlib_cli_output (vm, "Deleted.");
1095 vlib_cli_output (vm, "Error during deletion of tap interface. (rc: %d)", rc);
1101 VLIB_CLI_COMMAND (tap_delete_command, static) = {
1102 .path = "tap delete",
1103 .short_help = "tap delete <vpp-tap-intfc-name>",
1104 .function = tap_delete_command_fn,
1108 * @brief Modifies tap interface - can result in new interface being created
1110 * @param *vm - vlib_main_t
1111 * @param orig_sw_if_index - u32
1112 * @param *intfc_name - u8
1113 * @param *hwaddr_arg - u8
1114 * @param *sw_if_indexp - u32
1115 * @param renumber - u8
1116 * @param custom_dev_instance - u32
1121 int vnet_tap_modify (vlib_main_t * vm, u32 orig_sw_if_index,
1122 u8 * intfc_name, u8 *hwaddr_arg,
1124 u8 renumber, u32 custom_dev_instance)
1126 int rv = vnet_tap_delete (vm, orig_sw_if_index);
1131 rv = vnet_tap_connect_renumber(vm, intfc_name, hwaddr_arg, sw_if_indexp,
1132 renumber, custom_dev_instance);
1138 * @brief CLI function to modify TAP interface
1140 * @param *vm - vlib_main_t
1141 * @param *input - unformat_input_t
1142 * @param *cmd - vlib_cli_command_t
1144 * @return error - clib_error_t
1147 static clib_error_t *
1148 tap_modify_command_fn (vlib_main_t * vm,
1149 unformat_input_t * input,
1150 vlib_cli_command_t * cmd)
1153 tapcli_main_t * tm = &tapcli_main;
1154 u32 sw_if_index = ~0;
1155 u32 new_sw_if_index = ~0;
1156 int user_hwaddr = 0;
1159 if (tm->is_disabled)
1161 return clib_error_return (0, "device disabled...");
1164 if (unformat (input, "%U", unformat_vnet_sw_interface, tm->vnet_main,
1168 return clib_error_return (0, "unknown input `%U'",
1169 format_unformat_error, input);
1171 if (unformat (input, "%s", &intfc_name))
1174 return clib_error_return (0, "unknown input `%U'",
1175 format_unformat_error, input);
1177 if (unformat(input, "hwaddr %U", unformat_ethernet_address,
1182 int rc = vnet_tap_modify (vm, sw_if_index, intfc_name,
1183 (user_hwaddr == 1 ? hwaddr : 0),
1184 &new_sw_if_index, 0, 0);
1187 vlib_cli_output (vm, "Modified %U for Linux tap '%s'",
1188 format_vnet_sw_if_index_name, tm->vnet_main,
1189 new_sw_if_index, intfc_name);
1191 vlib_cli_output (vm, "Error during modification of tap interface. (rc: %d)", rc);
1197 VLIB_CLI_COMMAND (tap_modify_command, static) = {
1198 .path = "tap modify",
1199 .short_help = "tap modify <vpp-tap-intfc-name> <linux-intfc-name> [hwaddr <addr>]",
1200 .function = tap_modify_command_fn,
1204 * @brief CLI function to connect TAP interface
1206 * @param *vm - vlib_main_t
1207 * @param *input - unformat_input_t
1208 * @param *cmd - vlib_cli_command_t
1210 * @return error - clib_error_t
1213 static clib_error_t *
1214 tap_connect_command_fn (vlib_main_t * vm,
1215 unformat_input_t * input,
1216 vlib_cli_command_t * cmd)
1219 tapcli_main_t * tm = &tapcli_main;
1224 if (tm->is_disabled)
1226 return clib_error_return (0, "device disabled...");
1229 if (unformat (input, "%s", &intfc_name))
1232 return clib_error_return (0, "unknown input `%U'",
1233 format_unformat_error, input);
1235 if (unformat(input, "hwaddr %U", unformat_ethernet_address,
1237 hwaddr_arg = hwaddr;
1239 /* It is here for backward compatibility */
1240 if (unformat(input, "hwaddr random"))
1243 int rv = vnet_tap_connect(vm, intfc_name, hwaddr_arg, &sw_if_index);
1246 case VNET_API_ERROR_SYSCALL_ERROR_1:
1247 vlib_cli_output (vm, "Couldn't open /dev/net/tun");
1250 case VNET_API_ERROR_SYSCALL_ERROR_2:
1251 vlib_cli_output (vm, "Error setting flags on '%s'", intfc_name);
1254 case VNET_API_ERROR_SYSCALL_ERROR_3:
1255 vlib_cli_output (vm, "Couldn't open provisioning socket");
1258 case VNET_API_ERROR_SYSCALL_ERROR_4:
1259 vlib_cli_output (vm, "Couldn't get if_index");
1262 case VNET_API_ERROR_SYSCALL_ERROR_5:
1263 vlib_cli_output (vm, "Couldn't bind provisioning socket");
1266 case VNET_API_ERROR_SYSCALL_ERROR_6:
1267 vlib_cli_output (0, "Couldn't set device non-blocking flag");
1270 case VNET_API_ERROR_SYSCALL_ERROR_7:
1271 vlib_cli_output (0, "Couldn't set device MTU");
1274 case VNET_API_ERROR_SYSCALL_ERROR_8:
1275 vlib_cli_output (0, "Couldn't get interface flags");
1278 case VNET_API_ERROR_SYSCALL_ERROR_9:
1279 vlib_cli_output (0, "Couldn't set intfc admin state up");
1282 case VNET_API_ERROR_INVALID_REGISTRATION:
1283 vlib_cli_output (0, "Invalid registration");
1286 vlib_cli_output (0, "Unknown error: %d", rv);
1292 vlib_cli_output(vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main(), sw_if_index);
1296 VLIB_CLI_COMMAND (tap_connect_command, static) = {
1297 .path = "tap connect",
1298 .short_help = "tap connect <intfc-name> [hwaddr <addr>]",
1299 .function = tap_connect_command_fn,
1303 * @brief TAPCLI main init
1305 * @param *vm - vlib_main_t
1307 * @return error - clib_error_t
1311 tapcli_init (vlib_main_t * vm)
1313 tapcli_main_t * tm = &tapcli_main;
1316 tm->vnet_main = vnet_get_main();
1317 tm->unix_main = &unix_main;
1318 tm->mtu_bytes = TAP_MTU_DEFAULT;
1319 tm->tapcli_interface_index_by_sw_if_index = hash_create (0, sizeof(uword));
1320 tm->tapcli_interface_index_by_unix_fd = hash_create (0, sizeof (uword));
1322 vec_alloc(tm->rx_buffers, VLIB_FRAME_SIZE);
1323 vec_reset_length(tm->rx_buffers);
1324 vm->os_punt_frame = tapcli_nopunt_frame;
1328 VLIB_INIT_FUNCTION (tapcli_init);