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);
71 * @brief TUNTAP node main state
74 /** Vector of iovecs for readv/writev calls. */
75 struct iovec * iovecs;
77 /** Vector of VLIB rx buffers to use. We allocate them in blocks
78 of VLIB_FRAME_SIZE (256). */
81 /** File descriptors for /dev/net/tun and provisioning socket. */
82 int dev_net_tun_fd, dev_tap_fd;
84 /** Create a "tap" [ethernet] encaps device */
87 /** 1 if a "normal" routed intfc, 0 if a punt/inject interface */
89 int have_normal_interface;
91 /** tap device destination MAC address. Required, or Linux drops pkts */
94 /** Interface MTU in bytes and # of default sized buffers. */
95 u32 mtu_bytes, mtu_buffers;
97 /** Linux interface name for tun device. */
100 /** Pool of subinterface addresses */
101 subif_address_t *subifs;
103 /** Hash for subif addresses */
106 /** Unix file index */
109 /** For the "normal" interface, if configured */
110 u32 hw_if_index, sw_if_index;
114 static tuntap_main_t tuntap_main = {
117 /** Suitable defaults for an Ethernet-like tun/tap device */
118 .mtu_bytes = 4096 + 256,
125 * Output node, writes the buffers comprising the incoming frame
126 * to the tun/tap device, aka hands them to the Linux kernel stack.
128 * @param *vm - vlib_main_t
129 * @param *node - vlib_node_runtime_t
130 * @param *frame - vlib_frame_t
136 tuntap_tx (vlib_main_t * vm,
137 vlib_node_runtime_t * node,
138 vlib_frame_t * frame)
140 u32 * buffers = vlib_frame_args (frame);
141 uword n_packets = frame->n_vectors;
142 tuntap_main_t * tm = &tuntap_main;
143 vnet_main_t *vnm = vnet_get_main ();
144 vnet_interface_main_t *im = &vnm->interface_main;
148 for (i = 0; i < n_packets; i++)
154 b = vlib_get_buffer (vm, buffers[i]);
156 if (tm->is_ether && (!tm->have_normal_interface))
158 vlib_buffer_reset(b);
159 clib_memcpy (vlib_buffer_get_current (b), tm->ether_dst_mac, 6);
162 /* Re-set iovecs if present. */
164 _vec_len (tm->iovecs) = 0;
166 /** VLIB buffer chain -> Unix iovec(s). */
167 vec_add2 (tm->iovecs, iov, 1);
168 iov->iov_base = b->data + b->current_data;
169 iov->iov_len = l = b->current_length;
171 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
174 b = vlib_get_buffer (vm, b->next_buffer);
176 vec_add2 (tm->iovecs, iov, 1);
178 iov->iov_base = b->data + b->current_data;
179 iov->iov_len = b->current_length;
180 l += b->current_length;
181 } while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
184 if (writev (tm->dev_net_tun_fd, tm->iovecs, vec_len (tm->iovecs)) < l)
185 clib_unix_warning ("writev");
190 /* Update tuntap interface output stats. */
191 vlib_increment_combined_counter (im->combined_sw_if_counters
192 + VNET_INTERFACE_COUNTER_TX,
194 tm->sw_if_index, n_packets, n_bytes);
197 /** The normal interface path flattens the buffer chain */
198 if (tm->have_normal_interface)
199 vlib_buffer_free_no_next (vm, buffers, n_packets);
201 vlib_buffer_free (vm, buffers, n_packets);
206 VLIB_REGISTER_NODE (tuntap_tx_node,static) = {
207 .function = tuntap_tx,
209 .type = VLIB_NODE_TYPE_INTERNAL,
214 * @brief TUNTAP receive node
217 * @param *vm - vlib_main_t
218 * @param *node - vlib_node_runtime_t
219 * @param *frame - vlib_frame_t
225 tuntap_rx (vlib_main_t * vm,
226 vlib_node_runtime_t * node,
227 vlib_frame_t * frame)
229 tuntap_main_t * tm = &tuntap_main;
232 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
234 /** Make sure we have some RX buffers. */
236 uword n_left = vec_len (tm->rx_buffers);
239 if (n_left < VLIB_FRAME_SIZE / 2)
241 if (! tm->rx_buffers)
242 vec_alloc (tm->rx_buffers, VLIB_FRAME_SIZE);
244 n_alloc = vlib_buffer_alloc (vm, tm->rx_buffers + n_left, VLIB_FRAME_SIZE - n_left);
245 _vec_len (tm->rx_buffers) = n_left + n_alloc;
249 /** Allocate RX buffers from end of rx_buffers.
250 Turn them into iovecs to pass to readv. */
252 uword i_rx = vec_len (tm->rx_buffers) - 1;
254 word i, n_bytes_left, n_bytes_in_packet;
256 /** We should have enough buffers left for an MTU sized packet. */
257 ASSERT (vec_len (tm->rx_buffers) >= tm->mtu_buffers);
259 vec_validate (tm->iovecs, tm->mtu_buffers - 1);
260 for (i = 0; i < tm->mtu_buffers; i++)
262 b = vlib_get_buffer (vm, tm->rx_buffers[i_rx - i]);
263 tm->iovecs[i].iov_base = b->data;
264 tm->iovecs[i].iov_len = buffer_size;
267 n_bytes_left = readv (tm->dev_net_tun_fd, tm->iovecs, tm->mtu_buffers);
268 n_bytes_in_packet = n_bytes_left;
269 if (n_bytes_left <= 0)
272 clib_unix_warning ("readv %d", n_bytes_left);
276 bi = tm->rx_buffers[i_rx];
280 b = vlib_get_buffer (vm, tm->rx_buffers[i_rx]);
283 b->current_length = n_bytes_left < buffer_size ? n_bytes_left : buffer_size;
285 n_bytes_left -= buffer_size;
287 if (n_bytes_left <= 0)
293 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
294 b->next_buffer = tm->rx_buffers[i_rx];
297 /** Interface counters for tuntap interface. */
298 vlib_increment_combined_counter
299 (vnet_main.interface_main.combined_sw_if_counters
300 + VNET_INTERFACE_COUNTER_RX,
301 vlib_get_thread_index(),
303 1, n_bytes_in_packet);
305 _vec_len (tm->rx_buffers) = i_rx;
308 b = vlib_get_buffer (vm, bi);
312 uword n_trace = vlib_get_trace_count (vm, node);
314 vnet_buffer (b)->sw_if_index[VLIB_RX] = tm->sw_if_index;
315 vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32)~0;
318 * Turn this on if you run into
319 * "bad monkey" contexts, and you want to know exactly
320 * which nodes they've visited...
322 if (VLIB_BUFFER_TRACE_TRAJECTORY)
325 b->error = node->errors[0];
329 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
332 switch (b->data[0] & 0xf0)
335 next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
338 next_index = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
341 next_index = VNET_DEVICE_INPUT_NEXT_DROP;
345 /* The linux kernel couldn't care less if our interface is up */
346 if (tm->have_normal_interface)
348 vnet_main_t *vnm = vnet_get_main();
349 vnet_sw_interface_t * si;
350 si = vnet_get_sw_interface (vnm, tm->sw_if_index);
351 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
352 next_index = VNET_DEVICE_INPUT_NEXT_DROP;
355 vnet_feature_start_device_input_x1 (tm->sw_if_index, &next_index, b);
357 vlib_set_next_frame_buffer (vm, node, next_index, bi);
361 vlib_trace_buffer (vm, node, next_index,
362 b, /* follow_chain */ 1);
363 vlib_set_trace_count (vm, node, n_trace - 1);
371 * @brief TUNTAP_RX error strings
373 static char * tuntap_rx_error_strings[] = {
374 "unknown packet type",
377 VLIB_REGISTER_NODE (tuntap_rx_node,static) = {
378 .function = tuntap_rx,
380 .sibling_of = "device-input",
381 .type = VLIB_NODE_TYPE_INPUT,
382 .state = VLIB_NODE_STATE_INTERRUPT,
385 .error_strings = tuntap_rx_error_strings,
389 * @brief Gets called when file descriptor is ready from epoll.
391 * @param *uf - unix_file_t
393 * @return error - clib_error_t
395 static clib_error_t * tuntap_read_ready (unix_file_t * uf)
397 vlib_main_t * vm = vlib_get_main();
398 vlib_node_set_interrupt_pending (vm, tuntap_rx_node.index);
403 * @brief Clean up the tun/tap device
405 * @param *vm - vlib_main_t
407 * @return error - clib_error_t
410 static clib_error_t *
411 tuntap_exit (vlib_main_t * vm)
413 tuntap_main_t *tm = &tuntap_main;
418 if (! tm->dev_net_tun_fd || tm->dev_net_tun_fd < 0)
421 sfd = socket (AF_INET, SOCK_STREAM, 0);
423 clib_unix_warning("provisioning socket");
425 memset(&ifr, 0, sizeof (ifr));
426 strncpy (ifr.ifr_name, tm->tun_name, sizeof (ifr.ifr_name)-1);
428 /* get flags, modify to bring down interface... */
429 if (ioctl (sfd, SIOCGIFFLAGS, &ifr) < 0)
430 clib_unix_warning ("SIOCGIFFLAGS");
432 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
434 if (ioctl (sfd, SIOCSIFFLAGS, &ifr) < 0)
435 clib_unix_warning ("SIOCSIFFLAGS");
437 /* Turn off persistence */
438 if (ioctl (tm->dev_net_tun_fd, TUNSETPERSIST, 0) < 0)
439 clib_unix_warning ("TUNSETPERSIST");
440 close(tm->dev_tap_fd);
441 if (tm->dev_net_tun_fd >= 0)
442 close(tm->dev_net_tun_fd);
449 VLIB_MAIN_LOOP_EXIT_FUNCTION (tuntap_exit);
452 * @brief CLI function for tun/tap config
454 * @param *vm - vlib_main_t
455 * @param *input - unformat_input_t
457 * @return error - clib_error_t
460 static clib_error_t *
461 tuntap_config (vlib_main_t * vm, unformat_input_t * input)
463 tuntap_main_t *tm = &tuntap_main;
464 clib_error_t * error = 0;
467 int flags = IFF_TUN | IFF_NO_PI;
468 int is_enabled = 0, is_ether = 0, have_normal_interface = 0;
469 const uword buffer_size = VLIB_BUFFER_DATA_SIZE;
471 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
473 if (unformat (input, "mtu %d", &tm->mtu_bytes))
475 else if (unformat (input, "enable"))
477 else if (unformat (input, "disable"))
479 else if (unformat (input, "ethernet") ||
480 unformat (input, "ether"))
482 else if (unformat (input, "have-normal-interface") ||
483 unformat (input, "have-normal"))
484 have_normal_interface = 1;
485 else if (unformat (input, "name %s", &name))
486 tm->tun_name = (char *) name;
488 return clib_error_return (0, "unknown input `%U'",
489 format_unformat_error, input);
492 tm->dev_net_tun_fd = -1;
500 clib_warning ("tuntap disabled: must be superuser");
504 tm->is_ether = is_ether;
505 tm->have_normal_interface = have_normal_interface;
508 flags = IFF_TAP | IFF_NO_PI;
510 if ((tm->dev_net_tun_fd = open ("/dev/net/tun", O_RDWR)) < 0)
512 error = clib_error_return_unix (0, "open /dev/net/tun");
516 memset (&ifr, 0, sizeof (ifr));
517 strncpy(ifr.ifr_name, tm->tun_name, sizeof(ifr.ifr_name)-1);
518 ifr.ifr_flags = flags;
519 if (ioctl (tm->dev_net_tun_fd, TUNSETIFF, (void *)&ifr) < 0)
521 error = clib_error_return_unix (0, "ioctl TUNSETIFF");
525 /* Make it persistent, at least until we split. */
526 if (ioctl (tm->dev_net_tun_fd, TUNSETPERSIST, 1) < 0)
528 error = clib_error_return_unix (0, "TUNSETPERSIST");
532 /* Open a provisioning socket */
533 if ((tm->dev_tap_fd = socket(PF_PACKET, SOCK_RAW,
534 htons(ETH_P_ALL))) < 0 )
536 error = clib_error_return_unix (0, "socket");
540 /* Find the interface index. */
543 struct sockaddr_ll sll;
545 memset (&ifr, 0, sizeof(ifr));
546 strncpy (ifr.ifr_name, tm->tun_name, sizeof(ifr.ifr_name)-1);
547 if (ioctl (tm->dev_tap_fd, SIOCGIFINDEX, &ifr) < 0 )
549 error = clib_error_return_unix (0, "ioctl SIOCGIFINDEX");
553 /* Bind the provisioning socket to the interface. */
554 memset(&sll, 0, sizeof(sll));
555 sll.sll_family = AF_PACKET;
556 sll.sll_ifindex = ifr.ifr_ifindex;
557 sll.sll_protocol = htons(ETH_P_ALL);
559 if (bind(tm->dev_tap_fd, (struct sockaddr*) &sll, sizeof(sll)) < 0)
561 error = clib_error_return_unix (0, "bind");
566 /* non-blocking I/O on /dev/tapX */
569 if (ioctl (tm->dev_net_tun_fd, FIONBIO, &one) < 0)
571 error = clib_error_return_unix (0, "ioctl FIONBIO");
576 tm->mtu_buffers = (tm->mtu_bytes + (buffer_size - 1)) / buffer_size;
578 ifr.ifr_mtu = tm->mtu_bytes;
579 if (ioctl (tm->dev_tap_fd, SIOCSIFMTU, &ifr) < 0)
581 error = clib_error_return_unix (0, "ioctl SIOCSIFMTU");
585 /* get flags, modify to bring up interface... */
586 if (ioctl (tm->dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0)
588 error = clib_error_return_unix (0, "ioctl SIOCGIFFLAGS");
592 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
594 if (ioctl (tm->dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0)
596 error = clib_error_return_unix (0, "ioctl SIOCSIFFLAGS");
602 if (ioctl (tm->dev_tap_fd, SIOCGIFHWADDR, &ifr) < 0)
604 error = clib_error_return_unix (0, "ioctl SIOCGIFHWADDR");
608 clib_memcpy (tm->ether_dst_mac, ifr.ifr_hwaddr.sa_data, 6);
611 if (have_normal_interface)
613 vnet_main_t *vnm = vnet_get_main();
614 error = ethernet_register_interface
616 tuntap_dev_class.index,
617 0 /* device instance */,
618 tm->ether_dst_mac /* ethernet address */,
620 0 /* flag change */);
622 clib_error_report (error);
623 tm->sw_if_index = tm->hw_if_index;
624 vm->os_punt_frame = tuntap_nopunt_frame;
628 vnet_main_t *vnm = vnet_get_main();
629 vnet_hw_interface_t * hi;
631 vm->os_punt_frame = tuntap_punt_frame;
633 tm->hw_if_index = vnet_register_interface
635 tuntap_dev_class.index, 0 /* device instance */,
636 tuntap_interface_class.index, 0);
637 hi = vnet_get_hw_interface (vnm, tm->hw_if_index);
638 tm->sw_if_index = hi->sw_if_index;
640 /* Interface is always up. */
641 vnet_hw_interface_set_flags (vnm, tm->hw_if_index,
642 VNET_HW_INTERFACE_FLAG_LINK_UP);
643 vnet_sw_interface_set_flags (vnm, tm->sw_if_index,
644 VNET_SW_INTERFACE_FLAG_ADMIN_UP);
648 unix_file_t template = {0};
649 template.read_function = tuntap_read_ready;
650 template.file_descriptor = tm->dev_net_tun_fd;
651 tm->unix_file_index = unix_file_add (&unix_main, &template);
657 if (tm->dev_net_tun_fd >= 0)
658 close (tm->dev_net_tun_fd);
659 if (tm->dev_tap_fd >= 0)
660 close (tm->dev_tap_fd);
666 VLIB_CONFIG_FUNCTION (tuntap_config, "tuntap");
669 * @brief Add or Del IP4 address to tun/tap interface
671 * @param *im - ip4_main_t
672 * @param opaque - uword
673 * @param sw_if_index - u32
674 * @param *address - ip4_address_t
675 * @param is_delete - u32
679 tuntap_ip4_add_del_interface_address (ip4_main_t * im,
682 ip4_address_t * address,
684 u32 if_address_index,
687 tuntap_main_t * tm = &tuntap_main;
689 subif_address_t subif_addr, * ap;
692 /** Tuntap disabled, or using a "normal" interface. */
693 if (tm->have_normal_interface || tm->dev_tap_fd < 0)
696 /* if the address is being applied to an interface that is not in
697 * the same table/VRF as this tap, then ignore it.
698 * If we don't do this overlapping address spaces in the diferent tables
699 * breaks the linux host's routing tables */
700 if (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
702 fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
706 /** See if we already know about this subif */
707 memset (&subif_addr, 0, sizeof (subif_addr));
708 subif_addr.sw_if_index = sw_if_index;
709 clib_memcpy (&subif_addr.addr, address, sizeof (*address));
711 p = mhash_get (&tm->subif_mhash, &subif_addr);
714 ap = pool_elt_at_index (tm->subifs, p[0]);
717 pool_get (tm->subifs, ap);
719 mhash_set (&tm->subif_mhash, ap, ap - tm->subifs, 0);
722 /* Use subif pool index to select alias device. */
723 memset (&ifr, 0, sizeof (ifr));
724 snprintf (ifr.ifr_name, sizeof(ifr.ifr_name),
725 "%s:%d", tm->tun_name, (int)(ap - tm->subifs));
727 /* the tuntap punt/inject is enabled for IPv4 RX so long as
728 * any vpp interface has an IPv4 address.
729 * this is also ref counted.
731 ip4_sw_interface_enable_disable (tm->sw_if_index, !is_delete);
735 struct sockaddr_in * sin;
737 sin = (struct sockaddr_in *)&ifr.ifr_addr;
739 /* Set ipv4 address, netmask. */
740 sin->sin_family = AF_INET;
741 clib_memcpy (&sin->sin_addr.s_addr, address, 4);
742 if (ioctl (tm->dev_tap_fd, SIOCSIFADDR, &ifr) < 0)
743 clib_unix_warning ("ioctl SIOCSIFADDR");
745 sin->sin_addr.s_addr = im->fib_masks[address_length];
746 if (ioctl (tm->dev_tap_fd, SIOCSIFNETMASK, &ifr) < 0)
747 clib_unix_warning ("ioctl SIOCSIFNETMASK");
751 mhash_unset (&tm->subif_mhash, &subif_addr, 0 /* old value ptr */);
752 pool_put (tm->subifs, ap);
755 /* get flags, modify to bring up interface... */
756 if (ioctl (tm->dev_tap_fd, SIOCGIFFLAGS, &ifr) < 0)
757 clib_unix_warning ("ioctl SIOCGIFFLAGS");
760 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
762 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
764 if (ioctl (tm->dev_tap_fd, SIOCSIFFLAGS, &ifr) < 0)
765 clib_unix_warning ("ioctl SIOCSIFFLAGS");
769 * @brief workaround for a known include file bug.
770 * including @c <linux/ipv6.h> causes multiple definitions if
771 * @c <netinet/in.h is also included.
774 struct in6_addr ifr6_addr;
780 * @brief Add or Del tun/tap interface address.
782 * Both the v6 interface address API and the way ifconfig
783 * displays subinterfaces differ from their v4 couterparts.
784 * The code given here seems to work but YMMV.
786 * @param *im - ip6_main_t
787 * @param opaque - uword
788 * @param sw_if_index - u32
789 * @param *address - ip6_address_t
790 * @param address_length - u32
791 * @param if_address_index - u32
792 * @param is_delete - u32
795 tuntap_ip6_add_del_interface_address (ip6_main_t * im,
798 ip6_address_t * address,
800 u32 if_address_index,
803 tuntap_main_t * tm = &tuntap_main;
805 struct in6_ifreq ifr6;
806 subif_address_t subif_addr, * ap;
809 /* Tuntap disabled, or using a "normal" interface. */
810 if (tm->have_normal_interface || tm->dev_tap_fd < 0)
813 /* if the address is being applied to an interface that is not in
814 * the same table/VRF as this tap, then ignore it.
815 * If we don't do this overlapping address spaces in the diferent tables
816 * breaks the linux host's routing tables */
817 if (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP6,
819 fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP6,
823 /* See if we already know about this subif */
824 memset (&subif_addr, 0, sizeof (subif_addr));
825 subif_addr.sw_if_index = sw_if_index;
826 subif_addr.is_v6 = 1;
827 clib_memcpy (&subif_addr.addr, address, sizeof (*address));
829 p = mhash_get (&tm->subif_mhash, &subif_addr);
832 ap = pool_elt_at_index (tm->subifs, p[0]);
835 pool_get (tm->subifs, ap);
837 mhash_set (&tm->subif_mhash, ap, ap - tm->subifs, 0);
840 /* Use subif pool index to select alias device. */
841 memset (&ifr, 0, sizeof (ifr));
842 memset (&ifr6, 0, sizeof (ifr6));
843 snprintf (ifr.ifr_name, sizeof(ifr.ifr_name),
844 "%s:%d", tm->tun_name, (int)(ap - tm->subifs));
846 /* the tuntap punt/inject is enabled for IPv6 RX so long as
847 * any vpp interface has an IPv6 address.
848 * this is also ref counted.
850 ip6_sw_interface_enable_disable (tm->sw_if_index, !is_delete);
854 int sockfd = socket (AF_INET6, SOCK_STREAM, 0);
856 clib_unix_warning ("get ifindex socket");
858 if (ioctl (sockfd, SIOGIFINDEX, &ifr) < 0)
859 clib_unix_warning ("get ifindex");
861 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
862 ifr6.ifr6_prefixlen = address_length;
863 clib_memcpy (&ifr6.ifr6_addr, address, 16);
865 if (ioctl (sockfd, SIOCSIFADDR, &ifr6) < 0)
866 clib_unix_warning ("set address");
873 int sockfd = socket (AF_INET6, SOCK_STREAM, 0);
875 clib_unix_warning ("get ifindex socket");
877 if (ioctl (sockfd, SIOGIFINDEX, &ifr) < 0)
878 clib_unix_warning ("get ifindex");
880 ifr6.ifr6_ifindex = ifr.ifr_ifindex;
881 ifr6.ifr6_prefixlen = address_length;
882 clib_memcpy (&ifr6.ifr6_addr, address, 16);
884 if (ioctl (sockfd, SIOCDIFADDR, &ifr6) < 0)
885 clib_unix_warning ("del address");
890 mhash_unset (&tm->subif_mhash, &subif_addr, 0 /* old value ptr */);
891 pool_put (tm->subifs, ap);
896 * @brief TX the tun/tap frame
898 * @param *vm - vlib_main_t
899 * @param *node - vlib_node_runtime_t
900 * @param *frame - vlib_frame_t
904 tuntap_punt_frame (vlib_main_t * vm,
905 vlib_node_runtime_t * node,
906 vlib_frame_t * frame)
908 tuntap_tx (vm, node, frame);
909 vlib_frame_free (vm, node, frame);
913 * @brief Free the tun/tap frame
915 * @param *vm - vlib_main_t
916 * @param *node - vlib_node_runtime_t
917 * @param *frame - vlib_frame_t
921 tuntap_nopunt_frame (vlib_main_t * vm,
922 vlib_node_runtime_t * node,
923 vlib_frame_t * frame)
925 u32 * buffers = vlib_frame_args (frame);
926 uword n_packets = frame->n_vectors;
927 vlib_buffer_free (vm, buffers, n_packets);
928 vlib_frame_free (vm, node, frame);
931 VNET_HW_INTERFACE_CLASS (tuntap_interface_class,static) = {
933 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
937 * @brief Format tun/tap interface name
939 * @param *s - u8 - formatter string
940 * @param *args - va_list
942 * @return *s - u8 - formatted string
945 static u8 * format_tuntap_interface_name (u8 * s, va_list * args)
947 u32 i = va_arg (*args, u32);
949 s = format (s, "tuntap-%d", i);
954 * @brief TX packet out tun/tap
956 * @param *vm - vlib_main_t
957 * @param *node - vlib_node_runtime_t
958 * @param *frame - vlib_frame_t
960 * @return n_buffers - uword - Packets transmitted
964 tuntap_intfc_tx (vlib_main_t * vm,
965 vlib_node_runtime_t * node,
966 vlib_frame_t * frame)
968 tuntap_main_t * tm = &tuntap_main;
969 u32 * buffers = vlib_frame_args (frame);
970 uword n_buffers = frame->n_vectors;
972 /* Normal interface transmit happens only on the normal interface... */
973 if (tm->have_normal_interface)
974 return tuntap_tx (vm, node, frame);
976 vlib_buffer_free (vm, buffers, n_buffers);
980 VNET_DEVICE_CLASS (tuntap_dev_class,static) = {
982 .tx_function = tuntap_intfc_tx,
983 .format_device_name = format_tuntap_interface_name,
987 * @brief tun/tap node init
989 * @param *vm - vlib_main_t
991 * @return error - clib_error_t
994 static clib_error_t *
995 tuntap_init (vlib_main_t * vm)
997 clib_error_t * error;
998 ip4_main_t * im4 = &ip4_main;
999 ip6_main_t * im6 = &ip6_main;
1000 ip4_add_del_interface_address_callback_t cb4;
1001 ip6_add_del_interface_address_callback_t cb6;
1002 tuntap_main_t * tm = &tuntap_main;
1004 error = vlib_call_init_function (vm, ip4_init);
1008 mhash_init (&tm->subif_mhash, sizeof (u32), sizeof(subif_address_t));
1010 cb4.function = tuntap_ip4_add_del_interface_address;
1011 cb4.function_opaque = 0;
1012 vec_add1 (im4->add_del_interface_address_callbacks, cb4);
1014 cb6.function = tuntap_ip6_add_del_interface_address;
1015 cb6.function_opaque = 0;
1016 vec_add1 (im6->add_del_interface_address_callbacks, cb6);
1021 VLIB_INIT_FUNCTION (tuntap_init);