2 * Copyright (c) 2020 Cisco and/or its affiliates.
3 * Copyright (c) 2020 Doc.ai and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <vnet/adj/adj_midchain.h>
18 #include <vnet/udp/udp.h>
20 #include <wireguard/wireguard_messages.h>
21 #include <wireguard/wireguard_if.h>
22 #include <wireguard/wireguard.h>
23 #include <wireguard/wireguard_peer.h>
25 /* pool of interfaces */
28 /* bitmap of Allocated WG_ITF instances */
29 static uword *wg_if_instances;
31 /* vector of interfaces key'd on their sw_if_index */
32 static index_t *wg_if_index_by_sw_if_index;
34 /* vector of interfaces key'd on their UDP port (in network order) */
35 index_t **wg_if_indexes_by_port;
38 format_wg_if_name (u8 * s, va_list * args)
40 u32 dev_instance = va_arg (*args, u32);
41 return format (s, "wg%d", dev_instance);
45 format_wg_if (u8 * s, va_list * args)
47 index_t wgii = va_arg (*args, u32);
48 wg_if_t *wgi = wg_if_get (wgii);
49 noise_local_t *local = noise_local_get (wgi->local_idx);
50 u8 key[NOISE_KEY_LEN_BASE64];
52 s = format (s, "[%d] %U src:%U port:%d",
54 format_vnet_sw_if_index_name, vnet_get_main (),
55 wgi->sw_if_index, format_ip_address, &wgi->src_ip, wgi->port);
57 key_to_base64 (local->l_private, NOISE_PUBLIC_KEY_LEN, key);
59 s = format (s, " private-key:%s", key);
61 format (s, " %U", format_hex_bytes, local->l_private,
62 NOISE_PUBLIC_KEY_LEN);
64 key_to_base64 (local->l_public, NOISE_PUBLIC_KEY_LEN, key);
66 s = format (s, " public-key:%s", key);
69 format (s, " %U", format_hex_bytes, local->l_public,
70 NOISE_PUBLIC_KEY_LEN);
72 s = format (s, " mac-key: %U", format_hex_bytes,
73 &wgi->cookie_checker.cc_mac1_key, NOISE_PUBLIC_KEY_LEN);
79 wg_if_find_by_sw_if_index (u32 sw_if_index)
81 if (vec_len (wg_if_index_by_sw_if_index) <= sw_if_index)
83 u32 ti = wg_if_index_by_sw_if_index[sw_if_index];
91 wg_if_find_peer_by_public_key (index_t peeri, void *data)
93 uint8_t *public = data;
94 wg_peer_t *peer = wg_peer_get (peeri);
96 if (!memcmp (peer->remote.r_public, public, NOISE_PUBLIC_KEY_LEN))
98 return (WALK_CONTINUE);
101 static noise_remote_t *
102 wg_remote_get (const uint8_t public[NOISE_PUBLIC_KEY_LEN])
106 peeri = wg_peer_walk (wg_if_find_peer_by_public_key, (void *) public);
108 if (INDEX_INVALID != peeri)
109 return &wg_peer_get (peeri)->remote;
115 wg_index_set (noise_remote_t * remote)
117 wg_main_t *wmp = &wg_main;
118 u32 rnd_seed = (u32) (vlib_time_now (wmp->vlib_main) * 1e6);
120 wg_index_table_add (&wmp->index_table, remote->r_peer_idx, rnd_seed);
125 wg_index_drop (uint32_t key)
127 wg_main_t *wmp = &wg_main;
128 wg_index_table_del (&wmp->index_table, key);
131 static clib_error_t *
132 wg_if_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
134 vnet_hw_interface_t *hi;
138 hi = vnet_get_hw_interface (vnm, hw_if_index);
139 hw_flags = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP ?
140 VNET_HW_INTERFACE_FLAG_LINK_UP : 0);
141 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
143 wgii = wg_if_find_by_sw_if_index (hi->sw_if_index);
145 wg_if_peer_walk (wg_if_get (wgii), wg_peer_if_admin_state_change, NULL);
151 wg_if_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
155 wgii = wg_if_find_by_sw_if_index (sw_if_index);
156 wg_if_peer_walk (wg_if_get (wgii), wg_peer_if_adj_change, &ai);
161 VNET_DEVICE_CLASS (wg_if_device_class) = {
162 .name = "Wireguard Tunnel",
163 .format_device_name = format_wg_if_name,
164 .admin_up_down_function = wg_if_admin_up_down,
167 VNET_HW_INTERFACE_CLASS(wg_hw_interface_class) = {
169 .update_adjacency = wg_if_update_adj,
170 .flags = VNET_HW_INTERFACE_CLASS_FLAG_NBMA,
175 * Maintain a bitmap of allocated wg_if instance numbers.
177 #define WG_ITF_MAX_INSTANCE (16 * 1024)
180 wg_if_instance_alloc (u32 want)
183 * Check for dynamically allocated instance number.
189 bit = clib_bitmap_first_clear (wg_if_instances);
190 if (bit >= WG_ITF_MAX_INSTANCE)
194 wg_if_instances = clib_bitmap_set (wg_if_instances, bit, 1);
201 if (want >= WG_ITF_MAX_INSTANCE)
209 if (clib_bitmap_get (wg_if_instances, want))
215 * Grant allocation request.
217 wg_if_instances = clib_bitmap_set (wg_if_instances, want, 1);
223 wg_if_instance_free (u32 instance)
225 if (instance >= WG_ITF_MAX_INSTANCE)
230 if (clib_bitmap_get (wg_if_instances, instance) == 0)
235 wg_if_instances = clib_bitmap_set (wg_if_instances, instance, 0);
241 wg_if_create (u32 user_instance,
242 const u8 private_key[NOISE_PUBLIC_KEY_LEN],
243 u16 port, const ip_address_t * src_ip, u32 * sw_if_indexp)
245 vnet_main_t *vnm = vnet_get_main ();
246 u32 instance, hw_if_index;
247 vnet_hw_interface_t *hi;
249 noise_local_t *local;
251 ASSERT (sw_if_indexp);
253 *sw_if_indexp = (u32) ~ 0;
256 * Allocate a wg_if instance. Either select on dynamically
257 * or try to use the desired user_instance number.
259 instance = wg_if_instance_alloc (user_instance);
261 return VNET_API_ERROR_INVALID_REGISTRATION;
264 struct noise_upcall upcall = {
265 .u_remote_get = wg_remote_get,
266 .u_index_set = wg_index_set,
267 .u_index_drop = wg_index_drop,
271 pool_get (noise_local_pool, local);
273 noise_local_init (local, &upcall);
274 if (!noise_local_set_private (local, private_key))
276 pool_put (noise_local_pool, local);
277 wg_if_instance_free (instance);
278 return VNET_API_ERROR_INVALID_REGISTRATION;
281 pool_get (wg_if_pool, wg_if);
283 /* tunnel index (or instance) */
284 u32 t_idx = wg_if - wg_if_pool;
286 wg_if->user_instance = instance;
287 if (~0 == wg_if->user_instance)
288 wg_if->user_instance = t_idx;
290 vec_validate_init_empty (wg_if_indexes_by_port, port, NULL);
291 if (vec_len (wg_if_indexes_by_port[port]) == 0)
293 udp_register_dst_port (vlib_get_main (), port, wg4_input_node.index,
295 udp_register_dst_port (vlib_get_main (), port, wg6_input_node.index,
299 vec_add1 (wg_if_indexes_by_port[port], t_idx);
302 wg_if->local_idx = local - noise_local_pool;
303 cookie_checker_update (&wg_if->cookie_checker, local->l_public);
305 hw_if_index = vnet_register_interface (vnm,
306 wg_if_device_class.index,
308 wg_hw_interface_class.index, t_idx);
310 hi = vnet_get_hw_interface (vnm, hw_if_index);
312 vec_validate_init_empty (wg_if_index_by_sw_if_index, hi->sw_if_index,
314 wg_if_index_by_sw_if_index[hi->sw_if_index] = t_idx;
316 ip_address_copy (&wg_if->src_ip, src_ip);
317 wg_if->sw_if_index = *sw_if_indexp = hi->sw_if_index;
323 wg_if_delete (u32 sw_if_index)
325 vnet_main_t *vnm = vnet_get_main ();
327 if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
328 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
330 vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
331 if (hw == 0 || hw->dev_class_index != wg_if_device_class.index)
332 return VNET_API_ERROR_INVALID_VALUE;
335 index_t wgii = wg_if_find_by_sw_if_index (sw_if_index);
336 wg_if = wg_if_get (wgii);
338 return VNET_API_ERROR_INVALID_SW_IF_INDEX_2;
340 if (wg_if_instance_free (wg_if->user_instance) < 0)
341 return VNET_API_ERROR_INVALID_VALUE_2;
343 // Remove peers before interface deletion
344 wg_if_peer_walk (wg_if, wg_peer_if_delete, NULL);
347 index_t *ifs = wg_if_indexes_get_by_port (wg_if->port);
348 vec_foreach (ii, ifs)
352 vec_del1 (ifs, ifs - ii);
356 if (vec_len (ifs) == 0)
358 udp_unregister_dst_port (vlib_get_main (), wg_if->port, 1);
359 udp_unregister_dst_port (vlib_get_main (), wg_if->port, 0);
362 vnet_delete_hw_interface (vnm, hw->hw_if_index);
363 pool_put_index (noise_local_pool, wg_if->local_idx);
364 pool_put (wg_if_pool, wg_if);
370 wg_if_peer_add (wg_if_t * wgi, index_t peeri)
372 hash_set (wgi->peers, peeri, peeri);
374 if (1 == hash_elts (wgi->peers))
376 vnet_feature_enable_disable ("ip4-output", "wg4-output-tun",
377 wgi->sw_if_index, 1, 0, 0);
378 vnet_feature_enable_disable ("ip6-output", "wg6-output-tun",
379 wgi->sw_if_index, 1, 0, 0);
384 wg_if_peer_remove (wg_if_t * wgi, index_t peeri)
386 hash_unset (wgi->peers, peeri);
388 if (0 == hash_elts (wgi->peers))
390 vnet_feature_enable_disable ("ip4-output", "wg4-output-tun",
391 wgi->sw_if_index, 0, 0, 0);
392 vnet_feature_enable_disable ("ip6-output", "wg6-output-tun",
393 wgi->sw_if_index, 0, 0, 0);
398 wg_if_walk (wg_if_walk_cb_t fn, void *data)
403 pool_foreach_index (wgii, wg_if_pool)
405 if (WALK_STOP == fn(wgii, data))
412 wg_if_peer_walk (wg_if_t * wgi, wg_if_peer_walk_cb_t fn, void *data)
417 hash_foreach (peeri, val, wgi->peers, {
418 if (WALK_STOP == fn (peeri, data))
423 return INDEX_INVALID;
427 * fd.io coding-style-patch-verification: ON
430 * eval: (c-set-style "gnu")