2 *------------------------------------------------------------------
3 * tuntap.c - kernel stack (reverse) punt/inject path
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 TunTap Kernel stack (reverse) punt/inject path.
23 * This driver runs in one of two distinct modes:
24 * - "punt/inject" mode, where we send pkts not otherwise processed
25 * by the forwarding to the Linux kernel stack, and
27 * - "normal interface" mode, where we treat the Linux kernel stack
30 * By default, we select punt/inject mode.
33 #include <fcntl.h> /* for open */
34 #include <sys/ioctl.h>
35 #include <sys/socket.h>
37 #include <sys/types.h>
38 #include <sys/uio.h> /* for iovec */
39 #include <netinet/in.h>
41 #include <linux/if_arp.h>
42 #include <linux/if_tun.h>
44 #include <vlib/vlib.h>
45 #include <vlib/unix/unix.h>
47 #include <vnet/ip/ip.h>
48 #include <vnet/fib/fib_table.h>
50 #include <vnet/ethernet/ethernet.h>
51 #include <vnet/devices/devices.h>
52 #include <vnet/feature/feature.h>
54 static vnet_device_class_t tuntap_dev_class;
55 static vnet_hw_interface_class_t tuntap_interface_class;
57 static void tuntap_punt_frame (vlib_main_t * vm,
58 vlib_node_runtime_t * node,
59 vlib_frame_t * frame);
60 static void tuntap_nopunt_frame (vlib_main_t * vm,
61 vlib_node_runtime_t * node,
62 vlib_frame_t * frame);
72 * @brief TUNTAP per thread struct
76 /** Vector of VLIB rx buffers to use. We allocate them in blocks
77 of VLIB_FRAME_SIZE (256). */
80 /** Vector of iovecs for readv/writev calls. */
82 } tuntap_per_thread_t;
85 * @brief TUNTAP node main state
89 /** per thread variables */
90 tuntap_per_thread_t *threads;
92 /** File descriptors for /dev/net/tun and provisioning socket. */
93 int dev_net_tun_fd, dev_tap_fd;
95 /** Create a "tap" [ethernet] encaps device */
98 /** 1 if a "normal" routed intfc, 0 if a punt/inject interface */
100 int have_normal_interface;
102 /** tap device destination MAC address. Required, or Linux drops pkts */
105 /** Interface MTU in bytes and # of default sized buffers. */
106 u32 mtu_bytes, mtu_buffers;
108 /** Linux interface name for tun device. */
111 /** Pool of subinterface addresses */
112 subif_address_t *subifs;
114 /** Hash for subif addresses */
117 /** Unix file index */
120 /** For the "normal" interface, if configured */
121 u32 hw_if_index, sw_if_index;
125 static tuntap_main_t tuntap_main = {
128 /** Suitable defaults for an Ethernet-like tun/tap device */
129 .mtu_bytes = 4096 + 256,
136 * Output node, writes the buffers comprising the incoming frame
137 * to the tun/tap device, aka hands them to the Linux kernel stack.
139 * @param *vm - vlib_main_t
140 * @param *node - vlib_node_runtime_t
141 * @param *frame - vlib_frame_t
147 tuntap_tx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
149 u32 *buffers = vlib_frame_vector_args (frame);
150 uword n_packets = frame->n_vectors;
151 tuntap_main_t *tm = &tuntap_main;
152 vnet_main_t *vnm = vnet_get_main ();
153 vnet_interface_main_t *im = &vnm->interface_main;
156 u16 thread_index = vm->thread_index;
158 for (i = 0; i < n_packets; i++)
164 b = vlib_get_buffer (vm, buffers[i]);
166 if (tm->is_ether && (!tm->have_normal_interface))
168 vlib_buffer_reset (b);
169 clib_memcpy_fast (vlib_buffer_get_current (b), tm->ether_dst_mac,
173 /* Re-set iovecs if present. */
174 if (tm->threads[thread_index].iovecs)
175 _vec_len (tm->threads[thread_index].iovecs) = 0;
177 /** VLIB buffer chain -> Unix iovec(s). */
178 vec_add2 (tm->threads[thread_index].iovecs, iov, 1);
179 iov->iov_base = b->data + b->current_data;
180 iov->iov_len = l = b->current_length;
182 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
186 b = vlib_get_buffer (vm, b->next_buffer);
188 vec_add2 (tm->threads[thread_index].iovecs, iov, 1);
190 iov->iov_base = b->data + b->current_data;
191 iov->iov_len = b->current_length;
192 l += b->current_length;
194 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
197 if (writev (tm->dev_net_tun_fd, tm->threads[thread_index].iovecs,
198 vec_len (tm->threads[thread_index].iovecs)) < l)
199 clib_unix_warning ("writev");
204 /* Update tuntap interface output stats. */
205 vlib_increment_combined_counter (im->combined_sw_if_counters
206 + VNET_INTERFACE_COUNTER_TX,
208 tm->sw_if_index, n_packets, n_bytes);
211 /** The normal interface path flattens the buffer chain */
212 if (tm->have_normal_interface)
213 vlib_buffer_free_no_next (vm, buffers, n_packets);
215 vlib_buffer_free (vm, buffers, n_packets);
221 VLIB_REGISTER_NODE (tuntap_tx_node,static) = {
222 .function = tuntap_tx,
224 .type = VLIB_NODE_TYPE_INTERNAL,
230 * @brief TUNTAP receive node
233 * @param *vm - vlib_main_t
234 * @param *node - vlib_node_runtime_t
235 * @param *frame - vlib_frame_t
241 tuntap_rx (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
243 tuntap_main_t *tm = &tuntap_main;
246 const uword buffer_size = vlib_buffer_get_default_data_size (vm);
247 u16 thread_index = vm->thread_index;
249 /** Make sure we have some RX buffers. */
251 uword n_left = vec_len (tm->threads[thread_index].rx_buffers);
254 if (n_left < VLIB_FRAME_SIZE / 2)
256 if (!tm->threads[thread_index].rx_buffers)
257 vec_alloc (tm->threads[thread_index].rx_buffers, VLIB_FRAME_SIZE);
260 vlib_buffer_alloc (vm,
261 tm->threads[thread_index].rx_buffers + n_left,
262 VLIB_FRAME_SIZE - n_left);
263 _vec_len (tm->threads[thread_index].rx_buffers) = n_left + n_alloc;
267 /** Allocate RX buffers from end of rx_buffers.
268 Turn them into iovecs to pass to readv. */
270 uword i_rx = vec_len (tm->threads[thread_index].rx_buffers) - 1;
272 word i, n_bytes_left, n_bytes_in_packet;
274 /** We should have enough buffers left for an MTU sized packet. */
275 ASSERT (vec_len (tm->threads[thread_index].rx_buffers) >=
278 vec_validate (tm->threads[thread_index].iovecs, tm->mtu_buffers - 1);
279 for (i = 0; i < tm->mtu_buffers; i++)
283 tm->threads[thread_index].rx_buffers[i_rx - i]);
284 tm->threads[thread_index].iovecs[i].iov_base = b->data;
285 tm->threads[thread_index].iovecs[i].iov_len = buffer_size;
289 readv (tm->dev_net_tun_fd, tm->threads[thread_index].iovecs,
291 n_bytes_in_packet = n_bytes_left;
292 if (n_bytes_left <= 0)
295 clib_unix_warning ("readv %d", n_bytes_left);
299 bi = tm->threads[thread_index].rx_buffers[i_rx];
303 b = vlib_get_buffer (vm, tm->threads[thread_index].rx_buffers[i_rx]);
307 n_bytes_left < buffer_size ? n_bytes_left : buffer_size;
309 n_bytes_left -= buffer_size;
311 if (n_bytes_left <= 0)
317 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
318 b->next_buffer = tm->threads[thread_index].rx_buffers[i_rx];
321 /** Interface counters for tuntap interface. */
322 vlib_increment_combined_counter
323 (vnet_main.interface_main.combined_sw_if_counters
324 + VNET_INTERFACE_COUNTER_RX,
325 thread_index, tm->sw_if_index, 1, n_bytes_in_packet);
327 _vec_len (tm->threads[thread_index].rx_buffers) = i_rx;
330 b = vlib_get_buffer (vm, bi);
334 uword n_trace = vlib_get_trace_count (vm, node);
336 vnet_buffer (b)->sw_if_index[VLIB_RX] = tm->sw_if_index;
337 vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
339 b->error = node->errors[0];
343 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
346 switch (b->data[0] & 0xf0)
349 next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
352 next_index = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
355 next_index = VNET_DEVICE_INPUT_NEXT_DROP;
359 /* The linux kernel couldn't care less if our interface is up */
360 if (tm->have_normal_interface)
362 vnet_main_t *vnm = vnet_get_main ();
363 vnet_sw_interface_t *si;
364 si = vnet_get_sw_interface (vnm, tm->sw_if_index);
365 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
366 next_index = VNET_DEVICE_INPUT_NEXT_DROP;
369 vnet_feature_start_device_input_x1 (tm->sw_if_index, &next_index, b);
371 vlib_set_next_frame_buffer (vm, node, next_index, bi);
373 if (PREDICT_FALSE (n_trace > 0 && vlib_trace_buffer (vm, node, next_index, b, /* follow_chain */
375 vlib_set_trace_count (vm, node, n_trace - 1);
382 * @brief TUNTAP_RX error strings
384 static char *tuntap_rx_error_strings[] = {
385 "unknown packet type",
389 VLIB_REGISTER_NODE (tuntap_rx_node,static) = {
390 .function = tuntap_rx,
391 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
393 .sibling_of = "device-input",
394 .type = VLIB_NODE_TYPE_INPUT,
395 .state = VLIB_NODE_STATE_INTERRUPT,
398 .error_strings = tuntap_rx_error_strings,
403 * @brief Gets called when file descriptor is ready from epoll.
405 * @param *uf - clib_file_t
407 * @return error - clib_error_t
409 static clib_error_t *
410 tuntap_read_ready (clib_file_t * uf)
412 vlib_main_t *vm = vlib_get_main ();
413 vlib_node_set_interrupt_pending (vm, tuntap_rx_node.index);
418 * @brief Clean up the tun/tap device
420 * @param *vm - vlib_main_t
422 * @return error - clib_error_t
425 static clib_error_t *
426 tuntap_exit (vlib_main_t * vm)
428 tuntap_main_t *tm = &tuntap_main;
433 if (!tm->dev_net_tun_fd || tm->dev_net_tun_fd < 0)
436 sfd = socket (AF_INET, SOCK_STREAM, 0);
438 clib_unix_warning ("provisioning socket");
440 clib_memset (&ifr, 0, sizeof (ifr));
441 strncpy (ifr.ifr_name, tm->tun_name, sizeof (ifr.ifr_name) - 1);
443 /* get flags, modify to bring down interface... */
444 if (ioctl (sfd, SIOCGIFFLAGS, &ifr) < 0)
445 clib_unix_warning ("SIOCGIFFLAGS");
447 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
449 if (ioctl (sfd, SIOCSIFFLAGS, &ifr) < 0)
450 clib_unix_warning ("SIOCSIFFLAGS");
452 /* Turn off persistence */
453 if (ioctl (tm->dev_net_tun_fd, TUNSETPERSIST, 0) < 0)
454 clib_unix_warning ("TUNSETPERSIST");
455 close (tm->dev_tap_fd);
456 if (tm->dev_net_tun_fd >= 0)
457 close (tm->dev_net_tun_fd);
464 VLIB_MAIN_LOOP_EXIT_FUNCTION (tuntap_exit);
467 * @brief CLI function for tun/tap config
469 * @param *vm - vlib_main_t
470 * @param *input - unformat_input_t
472 * @return error - clib_error_t
475 static clib_error_t *
476 tuntap_config (vlib_main_t * vm, unformat_input_t * input)
478 tuntap_main_t *tm = &tuntap_main;
479 clib_error_t *error = 0;
482 int flags = IFF_TUN | IFF_NO_PI;
483 int is_enabled = 0, is_ether = 0, have_normal_interface = 0;
484 const uword buffer_size = vlib_buffer_get_default_data_size (vm);
486 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
488 if (unformat (input, "mtu %d", &tm->mtu_bytes))
490 else if (unformat (input, "enable"))
492 else if (unformat (input, "disable"))
494 else if (unformat (input, "ethernet") || unformat (input, "ether"))
496 else if (unformat (input, "have-normal-interface") ||
497 unformat (input, "have-normal"))
498 have_normal_interface = 1;
499 else if (unformat (input, "name %s", &name))
500 tm->tun_name = (char *) name;
502 return clib_error_return (0, "unknown input `%U'",
503 format_unformat_error, input);
506 tm->dev_net_tun_fd = -1;
514 clib_warning ("tuntap disabled: must be superuser");
518 tm->is_ether = is_ether;
519 tm->have_normal_interface = have_normal_interface;
522 flags = IFF_TAP | IFF_NO_PI;
524 if ((tm->dev_net_tun_fd = open ("/dev/net/tun", O_RDWR)) < 0)
526 error = clib_error_return_unix (0, "open /dev/net/tun");
530 clib_memset (&ifr, 0, sizeof (ifr));
531 strncpy (ifr.ifr_name, tm->tun_name, sizeof (ifr.ifr_name) - 1);
532 ifr.ifr_flags = flags;
533 if (ioctl (tm->dev_net_tun_fd, TUNSETIFF, (void *) &ifr) < 0)
535 error = clib_error_return_unix (0, "ioctl TUNSETIFF");
539 /* Make it persistent, at least until we split. */
540 if (ioctl (tm->dev_net_tun_fd, TUNSETPERSIST, 1) < 0)
542 error = clib_error_return_unix (0, "TUNSETPERSIST");
546 /* Open a provisioning socket */
547 if ((tm->dev_tap_fd = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0)
549 error = clib_error_return_unix (0, "socket");
553 /* Find the interface index. */
556 struct sockaddr_ll sll;
558 clib_memset (&ifr, 0, sizeof (ifr));
559 strncpy (ifr.ifr_name, tm->tun_name, sizeof (ifr.ifr_name) - 1);
560 if (ioctl (tm->dev_tap_fd, SIOCGIFINDEX, &ifr) < 0)
562 error = clib_error_return_unix (0, "ioctl SIOCGIFINDEX");
566 /* Bind the provisioning socket to the interface. */
567 clib_memset (&sll, 0, sizeof (sll));
568 sll.sll_family = AF_PACKET;
569 sll.sll_ifindex = ifr.ifr_ifindex;
570 sll.sll_protocol = htons (ETH_P_ALL);
572 if (bind (tm->dev_tap_fd, (struct sockaddr *) &sll, sizeof (sll)) < 0)
574 error = clib_error_return_unix (0, "bind");
579 /* non-blocking I/O on /dev/tapX */
582 if (ioctl (tm->dev_net_tun_fd, FIONBIO, &one) < 0)
584 error = clib_error_return_unix (0, "ioctl FIONBIO");
589 tm->mtu_buffers = (tm->mtu_bytes + (buffer_size - 1)) / buffer_size;
591 ifr.ifr_mtu = tm->mtu_bytes;
592 if (ioctl (tm->dev_tap_fd, SIOCSIFMTU, &ifr) < 0)
594 error = clib_error_return_unix (0, "ioctl SIOCSIFMTU");
598 /* get flags, modify to bring up interface... */
599 if (ioctl (tm->dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0)
601 error = clib_error_return_unix (0, "ioctl SIOCGIFFLAGS");
605 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
607 if (ioctl (tm->dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0)
609 error = clib_error_return_unix (0, "ioctl SIOCSIFFLAGS");
615 if (ioctl (tm->dev_tap_fd, SIOCGIFHWADDR, &ifr) < 0)
617 error = clib_error_return_unix (0, "ioctl SIOCGIFHWADDR");
621 clib_memcpy_fast (tm->ether_dst_mac, ifr.ifr_hwaddr.sa_data, 6);
624 if (have_normal_interface)
626 vnet_main_t *vnm = vnet_get_main ();
627 error = ethernet_register_interface
628 (vnm, tuntap_dev_class.index, 0 /* device instance */ ,
629 tm->ether_dst_mac /* ethernet address */ ,
630 &tm->hw_if_index, 0 /* flag change */ );
632 clib_error_report (error);
633 tm->sw_if_index = tm->hw_if_index;
634 vm->os_punt_frame = tuntap_nopunt_frame;
638 vnet_main_t *vnm = vnet_get_main ();
639 vnet_hw_interface_t *hi;
641 vm->os_punt_frame = tuntap_punt_frame;
643 tm->hw_if_index = vnet_register_interface
644 (vnm, tuntap_dev_class.index, 0 /* device instance */ ,
645 tuntap_interface_class.index, 0);
646 hi = vnet_get_hw_interface (vnm, tm->hw_if_index);
647 tm->sw_if_index = hi->sw_if_index;
649 /* Interface is always up. */
650 vnet_hw_interface_set_flags (vnm, tm->hw_if_index,
651 VNET_HW_INTERFACE_FLAG_LINK_UP);
652 vnet_sw_interface_set_flags (vnm, tm->sw_if_index,
653 VNET_SW_INTERFACE_FLAG_ADMIN_UP);
657 clib_file_t template = { 0 };
658 template.read_function = tuntap_read_ready;
659 template.file_descriptor = tm->dev_net_tun_fd;
660 template.description = format (0, "vnet tuntap");
661 tm->clib_file_index = clib_file_add (&file_main, &template);
667 if (tm->dev_net_tun_fd >= 0)
668 close (tm->dev_net_tun_fd);
669 if (tm->dev_tap_fd >= 0)
670 close (tm->dev_tap_fd);
676 VLIB_CONFIG_FUNCTION (tuntap_config, "tuntap");
679 * @brief Add or Del IP4 address to tun/tap interface
681 * @param *im - ip4_main_t
682 * @param opaque - uword
683 * @param sw_if_index - u32
684 * @param *address - ip4_address_t
685 * @param is_delete - u32
689 tuntap_ip4_add_del_interface_address (ip4_main_t * im,
692 ip4_address_t * address,
694 u32 if_address_index, u32 is_delete)
696 tuntap_main_t *tm = &tuntap_main;
698 subif_address_t subif_addr, *ap;
701 /** Tuntap disabled, or using a "normal" interface. */
702 if (tm->have_normal_interface || tm->dev_tap_fd < 0)
705 /* if the address is being applied to an interface that is not in
706 * the same table/VRF as this tap, then ignore it.
707 * If we don't do this overlapping address spaces in the different tables
708 * breaks the linux host's routing tables */
709 if (fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
711 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, tm->sw_if_index))
714 /** See if we already know about this subif */
715 clib_memset (&subif_addr, 0, sizeof (subif_addr));
716 subif_addr.sw_if_index = sw_if_index;
717 clib_memcpy_fast (&subif_addr.addr, address, sizeof (*address));
719 p = mhash_get (&tm->subif_mhash, &subif_addr);
722 ap = pool_elt_at_index (tm->subifs, p[0]);
725 pool_get (tm->subifs, ap);
727 mhash_set (&tm->subif_mhash, ap, ap - tm->subifs, 0);
730 /* Use subif pool index to select alias device. */
731 clib_memset (&ifr, 0, sizeof (ifr));
732 snprintf (ifr.ifr_name, sizeof (ifr.ifr_name),
733 "%s:%d", tm->tun_name, (int) (ap - tm->subifs));
735 /* the tuntap punt/inject is enabled for IPv4 RX so long as
736 * any vpp interface has an IPv4 address.
737 * this is also ref counted.
739 ip4_sw_interface_enable_disable (tm->sw_if_index, !is_delete);
743 struct sockaddr_in *sin;
745 sin = (struct sockaddr_in *) &ifr.ifr_addr;
747 /* Set ipv4 address, netmask. */
748 sin->sin_family = AF_INET;
749 clib_memcpy_fast (&sin->sin_addr.s_addr, address, 4);
750 if (ioctl (tm->dev_tap_fd, SIOCSIFADDR, &ifr) < 0)
751 clib_unix_warning ("ioctl SIOCSIFADDR");
753 sin->sin_addr.s_addr = im->fib_masks[address_length];
754 if (ioctl (tm->dev_tap_fd, SIOCSIFNETMASK, &ifr) < 0)
755 clib_unix_warning ("ioctl SIOCSIFNETMASK");
759 mhash_unset (&tm->subif_mhash, &subif_addr, 0 /* old value ptr */ );
760 pool_put (tm->subifs, ap);
763 /* get flags, modify to bring up interface... */
764 if (ioctl (tm->dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0)
765 clib_unix_warning ("ioctl SIOCGIFFLAGS");
768 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
770 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
772 if (ioctl (tm->dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0)
773 clib_unix_warning ("ioctl SIOCSIFFLAGS");
777 * @brief workaround for a known include file bug.
778 * including @c <linux/ipv6.h> causes multiple definitions if
779 * @c <netinet/in.h is also included.
783 struct in6_addr ifr6_addr;
789 * @brief Add or Del tun/tap interface address.
791 * Both the v6 interface address API and the way ifconfig
792 * displays subinterfaces differ from their v4 counterparts.
793 * The code given here seems to work but YMMV.
795 * @param *im - ip6_main_t
796 * @param opaque - uword
797 * @param sw_if_index - u32
798 * @param *address - ip6_address_t
799 * @param address_length - u32
800 * @param if_address_index - u32
801 * @param is_delete - u32
804 tuntap_ip6_add_del_interface_address (ip6_main_t * im,
807 ip6_address_t * address,
809 u32 if_address_index, u32 is_delete)
811 tuntap_main_t *tm = &tuntap_main;
813 struct in6_ifreq ifr6;
814 subif_address_t subif_addr, *ap;
817 /* Tuntap disabled, or using a "normal" interface. */
818 if (tm->have_normal_interface || tm->dev_tap_fd < 0)
821 /* if the address is being applied to an interface that is not in
822 * the same table/VRF as this tap, then ignore it.
823 * If we don't do this overlapping address spaces in the different tables
824 * breaks the linux host's routing tables */
825 if (fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
827 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, tm->sw_if_index))
830 /* See if we already know about this subif */
831 clib_memset (&subif_addr, 0, sizeof (subif_addr));
832 subif_addr.sw_if_index = sw_if_index;
833 subif_addr.is_v6 = 1;
834 clib_memcpy_fast (&subif_addr.addr, address, sizeof (*address));
836 p = mhash_get (&tm->subif_mhash, &subif_addr);
839 ap = pool_elt_at_index (tm->subifs, p[0]);
842 pool_get (tm->subifs, ap);
844 mhash_set (&tm->subif_mhash, ap, ap - tm->subifs, 0);
847 /* Use subif pool index to select alias device. */
848 clib_memset (&ifr, 0, sizeof (ifr));
849 clib_memset (&ifr6, 0, sizeof (ifr6));
850 snprintf (ifr.ifr_name, sizeof (ifr.ifr_name),
851 "%s:%d", tm->tun_name, (int) (ap - tm->subifs));
853 /* the tuntap punt/inject is enabled for IPv6 RX so long as
854 * any vpp interface has an IPv6 address.
855 * this is also ref counted.
857 ip6_sw_interface_enable_disable (tm->sw_if_index, !is_delete);
861 int sockfd = socket (AF_INET6, SOCK_STREAM, 0);
863 clib_unix_warning ("get ifindex socket");
865 if (ioctl (sockfd, SIOGIFINDEX, &ifr) < 0)
866 clib_unix_warning ("get ifindex");
868 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
869 ifr6.ifr6_prefixlen = address_length;
870 clib_memcpy_fast (&ifr6.ifr6_addr, address, 16);
872 if (ioctl (sockfd, SIOCSIFADDR, &ifr6) < 0)
873 clib_unix_warning ("set address");
880 int sockfd = socket (AF_INET6, SOCK_STREAM, 0);
882 clib_unix_warning ("get ifindex socket");
884 if (ioctl (sockfd, SIOGIFINDEX, &ifr) < 0)
885 clib_unix_warning ("get ifindex");
887 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
888 ifr6.ifr6_prefixlen = address_length;
889 clib_memcpy_fast (&ifr6.ifr6_addr, address, 16);
891 if (ioctl (sockfd, SIOCDIFADDR, &ifr6) < 0)
892 clib_unix_warning ("del address");
897 mhash_unset (&tm->subif_mhash, &subif_addr, 0 /* old value ptr */ );
898 pool_put (tm->subifs, ap);
903 * @brief TX the tun/tap frame
905 * @param *vm - vlib_main_t
906 * @param *node - vlib_node_runtime_t
907 * @param *frame - vlib_frame_t
911 tuntap_punt_frame (vlib_main_t * vm,
912 vlib_node_runtime_t * node, vlib_frame_t * frame)
914 tuntap_tx (vm, node, frame);
915 vlib_frame_free (vm, node, frame);
919 * @brief Free the tun/tap frame
921 * @param *vm - vlib_main_t
922 * @param *node - vlib_node_runtime_t
923 * @param *frame - vlib_frame_t
927 tuntap_nopunt_frame (vlib_main_t * vm,
928 vlib_node_runtime_t * node, vlib_frame_t * frame)
930 u32 *buffers = vlib_frame_vector_args (frame);
931 uword n_packets = frame->n_vectors;
932 vlib_buffer_free (vm, buffers, n_packets);
933 vlib_frame_free (vm, node, frame);
937 VNET_HW_INTERFACE_CLASS (tuntap_interface_class,static) = {
939 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
944 * @brief Format tun/tap interface name
946 * @param *s - u8 - formatter string
947 * @param *args - va_list
949 * @return *s - u8 - formatted string
953 format_tuntap_interface_name (u8 * s, va_list * args)
955 u32 i = va_arg (*args, u32);
957 s = format (s, "tuntap-%d", i);
962 * @brief TX packet out tun/tap
964 * @param *vm - vlib_main_t
965 * @param *node - vlib_node_runtime_t
966 * @param *frame - vlib_frame_t
968 * @return n_buffers - uword - Packets transmitted
972 tuntap_intfc_tx (vlib_main_t * vm,
973 vlib_node_runtime_t * node, vlib_frame_t * frame)
975 tuntap_main_t *tm = &tuntap_main;
976 u32 *buffers = vlib_frame_vector_args (frame);
977 uword n_buffers = frame->n_vectors;
979 /* Normal interface transmit happens only on the normal interface... */
980 if (tm->have_normal_interface)
981 return tuntap_tx (vm, node, frame);
983 vlib_buffer_free (vm, buffers, n_buffers);
988 VNET_DEVICE_CLASS (tuntap_dev_class,static) = {
990 .tx_function = tuntap_intfc_tx,
991 .format_device_name = format_tuntap_interface_name,
996 * @brief tun/tap node init
998 * @param *vm - vlib_main_t
1000 * @return error - clib_error_t
1003 static clib_error_t *
1004 tuntap_init (vlib_main_t * vm)
1006 ip4_main_t *im4 = &ip4_main;
1007 ip6_main_t *im6 = &ip6_main;
1008 ip4_add_del_interface_address_callback_t cb4;
1009 ip6_add_del_interface_address_callback_t cb6;
1010 tuntap_main_t *tm = &tuntap_main;
1011 vlib_thread_main_t *m = vlib_get_thread_main ();
1013 mhash_init (&tm->subif_mhash, sizeof (u32), sizeof (subif_address_t));
1015 cb4.function = tuntap_ip4_add_del_interface_address;
1016 cb4.function_opaque = 0;
1017 vec_add1 (im4->add_del_interface_address_callbacks, cb4);
1019 cb6.function = tuntap_ip6_add_del_interface_address;
1020 cb6.function_opaque = 0;
1021 vec_add1 (im6->add_del_interface_address_callbacks, cb6);
1022 vec_validate_aligned (tm->threads, m->n_vlib_mains - 1,
1023 CLIB_CACHE_LINE_BYTES);
1029 VLIB_INIT_FUNCTION (tuntap_init) =
1031 .runs_after = VLIB_INITS("ip4_init"),
1036 * fd.io coding-style-patch-verification: ON
1039 * eval: (c-set-style "gnu")