2 * Copyright (c) 2020 Doc.ai and/or its affiliates.
3 * Copyright (c) 2020 Cisco 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/fib/fib_table.h>
19 #include <wireguard/wireguard_peer.h>
20 #include <wireguard/wireguard_if.h>
21 #include <wireguard/wireguard_messages.h>
22 #include <wireguard/wireguard_key.h>
23 #include <wireguard/wireguard_send.h>
24 #include <wireguard/wireguard.h>
26 static fib_source_t wg_fib_source;
27 wg_peer_t *wg_peer_pool;
29 index_t *wg_peer_by_adj_index;
32 wg_peer_endpoint_reset (wg_peer_endpoint_t * ep)
34 ip46_address_reset (&ep->addr);
39 wg_peer_endpoint_init (wg_peer_endpoint_t * ep,
40 const ip46_address_t * addr, u16 port)
42 ip46_address_copy (&ep->addr, addr);
47 wg_peer_fib_flush (wg_peer_t * peer)
49 wg_peer_allowed_ip_t *allowed_ip;
51 vec_foreach (allowed_ip, peer->allowed_ips)
53 fib_table_entry_delete_index (allowed_ip->fib_entry_index, wg_fib_source);
54 allowed_ip->fib_entry_index = FIB_NODE_INDEX_INVALID;
59 wg_peer_fib_populate (wg_peer_t * peer, u32 fib_index)
61 wg_peer_allowed_ip_t *allowed_ip;
63 vec_foreach (allowed_ip, peer->allowed_ips)
65 allowed_ip->fib_entry_index =
66 fib_table_entry_path_add (fib_index,
70 fib_proto_to_dpo (allowed_ip->
72 &peer->dst.addr, peer->wg_sw_if_index, ~0, 1,
73 NULL, FIB_ROUTE_PATH_FLAG_NONE);
78 wg_peer_clear (vlib_main_t * vm, wg_peer_t * peer)
80 wg_timers_stop (peer);
81 for (int i = 0; i < WG_N_TIMERS; i++)
84 peer->timers_dispatched[i] = 0;
87 peer->last_sent_handshake = vlib_time_now (vm) - (REKEY_TIMEOUT + 1);
89 clib_memset (&peer->cookie_maker, 0, sizeof (peer->cookie_maker));
91 wg_peer_endpoint_reset (&peer->src);
92 wg_peer_endpoint_reset (&peer->dst);
94 if (INDEX_INVALID != peer->adj_index)
96 adj_unlock (peer->adj_index);
97 wg_peer_by_adj_index[peer->adj_index] = INDEX_INVALID;
99 wg_peer_fib_flush (peer);
101 peer->input_thread_index = ~0;
102 peer->output_thread_index = ~0;
103 peer->adj_index = INDEX_INVALID;
104 peer->timer_wheel = 0;
105 peer->persistent_keepalive_interval = 0;
106 peer->timer_handshake_attempts = 0;
107 peer->last_sent_packet = 0;
108 peer->last_received_packet = 0;
109 peer->session_derived = 0;
110 peer->rehandshake_started = 0;
111 peer->new_handshake_interval_tick = 0;
112 peer->rehandshake_interval_tick = 0;
113 peer->timer_need_another_keepalive = false;
114 peer->is_dead = true;
115 vec_free (peer->allowed_ips);
119 wg_peer_init (vlib_main_t * vm, wg_peer_t * peer)
121 peer->adj_index = INDEX_INVALID;
122 wg_peer_clear (vm, peer);
126 wg_peer_build_rewrite (const wg_peer_t * peer)
129 ip4_udp_header_t *hdr;
132 vec_validate (rewrite, sizeof (*hdr) - 1);
133 hdr = (ip4_udp_header_t *) rewrite;
135 hdr->ip4.ip_version_and_header_length = 0x45;
137 hdr->ip4.src_address = peer->src.addr.ip4;
138 hdr->ip4.dst_address = peer->dst.addr.ip4;
139 hdr->ip4.protocol = IP_PROTOCOL_UDP;
140 hdr->ip4.checksum = ip4_header_checksum (&hdr->ip4);
142 hdr->udp.src_port = clib_host_to_net_u16 (peer->src.port);
143 hdr->udp.dst_port = clib_host_to_net_u16 (peer->dst.port);
144 hdr->udp.checksum = 0;
150 wg_peer_adj_stack (wg_peer_t * peer)
156 adj = adj_get (peer->adj_index);
157 sw_if_index = adj->rewrite_header.sw_if_index;
159 wgi = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
164 if (!vnet_sw_interface_is_admin_up (vnet_get_main (), wgi->sw_if_index))
166 adj_midchain_delegate_unstack (peer->adj_index);
173 .fp_proto = FIB_PROTOCOL_IP4,
174 .fp_addr = peer->dst.addr,
179 fib_index = fib_table_find (FIB_PROTOCOL_IP4, peer->table_id);
181 adj_midchain_delegate_stack (peer->adj_index, fib_index, &dst);
186 wg_peer_if_admin_state_change (wg_if_t * wgi, index_t peeri, void *data)
188 wg_peer_adj_stack (wg_peer_get (peeri));
190 return (WALK_CONTINUE);
194 wg_peer_if_table_change (wg_if_t * wgi, index_t peeri, void *data)
196 wg_peer_table_bind_ctx_t *ctx = data;
199 peer = wg_peer_get (peeri);
201 wg_peer_fib_flush (peer);
202 wg_peer_fib_populate (peer, ctx->new_fib_index);
204 return (WALK_CONTINUE);
208 wg_peer_fill (vlib_main_t * vm, wg_peer_t * peer,
210 const ip46_address_t * dst,
212 u16 persistent_keepalive_interval,
213 const fib_prefix_t * allowed_ips, u32 wg_sw_if_index)
215 wg_peer_endpoint_init (&peer->dst, dst, port);
217 peer->table_id = table_id;
218 peer->wg_sw_if_index = wg_sw_if_index;
219 peer->timer_wheel = &wg_main.timer_wheel;
220 peer->persistent_keepalive_interval = persistent_keepalive_interval;
221 peer->last_sent_handshake = vlib_time_now (vm) - (REKEY_TIMEOUT + 1);
222 peer->is_dead = false;
224 const wg_if_t *wgi = wg_if_get (wg_if_find_by_sw_if_index (wg_sw_if_index));
227 return (VNET_API_ERROR_INVALID_INTERFACE);
229 ip_address_to_46 (&wgi->src_ip, &peer->src.addr);
230 peer->src.port = wgi->port;
233 * and an adjacency for the endpoint address in the overlay
234 * on the wg interface
236 peer->rewrite = wg_peer_build_rewrite (peer);
238 peer->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
240 &peer->dst.addr, wgi->sw_if_index);
242 vec_validate_init_empty (wg_peer_by_adj_index,
243 peer->adj_index, INDEX_INVALID);
244 wg_peer_by_adj_index[peer->adj_index] = peer - wg_peer_pool;
246 adj_nbr_midchain_update_rewrite (peer->adj_index,
249 ADJ_FLAG_MIDCHAIN_IP_STACK,
250 vec_dup (peer->rewrite));
251 wg_peer_adj_stack (peer);
254 * add a route in the overlay to each of the allowed-ips
258 vec_validate (peer->allowed_ips, vec_len (allowed_ips) - 1);
260 vec_foreach_index (ii, allowed_ips)
262 peer->allowed_ips[ii].prefix = allowed_ips[ii];
265 wg_peer_fib_populate (peer,
266 fib_table_get_index_for_sw_if_index
267 (FIB_PROTOCOL_IP4, peer->wg_sw_if_index));
273 wg_peer_add (u32 tun_sw_if_index,
274 const u8 public_key[NOISE_PUBLIC_KEY_LEN],
276 const ip46_address_t * endpoint,
277 const fib_prefix_t * allowed_ips,
278 u16 port, u16 persistent_keepalive, u32 * peer_index)
284 vlib_main_t *vm = vlib_get_main ();
286 if (tun_sw_if_index == ~0)
287 return (VNET_API_ERROR_INVALID_SW_IF_INDEX);
289 wg_if = wg_if_get (wg_if_find_by_sw_if_index (tun_sw_if_index));
291 return (VNET_API_ERROR_INVALID_SW_IF_INDEX);
294 pool_foreach (peer, wg_peer_pool)
296 if (!memcmp (peer->remote.r_public, public_key, NOISE_PUBLIC_KEY_LEN))
298 return (VNET_API_ERROR_ENTRY_ALREADY_EXISTS);
303 if (pool_elts (wg_peer_pool) > MAX_PEERS)
304 return (VNET_API_ERROR_LIMIT_EXCEEDED);
306 pool_get (wg_peer_pool, peer);
308 wg_peer_init (vm, peer);
310 rv = wg_peer_fill (vm, peer, table_id, endpoint, (u16) port,
311 persistent_keepalive, allowed_ips, tun_sw_if_index);
315 wg_peer_clear (vm, peer);
316 pool_put (wg_peer_pool, peer);
320 noise_remote_init (&peer->remote, peer - wg_peer_pool, public_key,
322 cookie_maker_init (&peer->cookie_maker, public_key);
324 if (peer->persistent_keepalive_interval != 0)
326 wg_send_keepalive (vm, peer);
329 *peer_index = peer - wg_peer_pool;
330 wg_if_peer_add (wg_if, *peer_index);
336 wg_peer_remove (index_t peeri)
338 wg_main_t *wmp = &wg_main;
339 wg_peer_t *peer = NULL;
342 if (pool_is_free_index (wg_peer_pool, peeri))
343 return VNET_API_ERROR_NO_SUCH_ENTRY;
345 peer = pool_elt_at_index (wg_peer_pool, peeri);
347 wgi = wg_if_get (wg_if_find_by_sw_if_index (peer->wg_sw_if_index));
348 wg_if_peer_remove (wgi, peeri);
350 vnet_feature_enable_disable ("ip4-output", "wg-output-tun",
351 peer->wg_sw_if_index, 0, 0, 0);
353 noise_remote_clear (wmp->vlib_main, &peer->remote);
354 wg_peer_clear (wmp->vlib_main, peer);
355 pool_put (wg_peer_pool, peer);
361 wg_peer_walk (wg_peer_walk_cb_t fn, void *data)
366 pool_foreach_index (peeri, wg_peer_pool)
368 if (WALK_STOP == fn(peeri, data))
372 return INDEX_INVALID;
376 format_wg_peer_endpoint (u8 * s, va_list * args)
378 wg_peer_endpoint_t *ep = va_arg (*args, wg_peer_endpoint_t *);
380 s = format (s, "%U:%d",
381 format_ip46_address, &ep->addr, IP46_TYPE_ANY, ep->port);
387 format_wg_peer (u8 * s, va_list * va)
389 index_t peeri = va_arg (*va, index_t);
390 wg_peer_allowed_ip_t *allowed_ip;
391 u8 key[NOISE_KEY_LEN_BASE64];
394 peer = wg_peer_get (peeri);
395 key_to_base64 (peer->remote.r_public, NOISE_PUBLIC_KEY_LEN, key);
397 s = format (s, "[%d] endpoint:[%U->%U] %U keep-alive:%d adj:%d",
399 format_wg_peer_endpoint, &peer->src,
400 format_wg_peer_endpoint, &peer->dst,
401 format_vnet_sw_if_index_name, vnet_get_main (),
402 peer->wg_sw_if_index,
403 peer->persistent_keepalive_interval, peer->adj_index);
404 s = format (s, "\n key:%=s %U",
405 key, format_hex_bytes, peer->remote.r_public,
406 NOISE_PUBLIC_KEY_LEN);
407 s = format (s, "\n allowed-ips:");
408 vec_foreach (allowed_ip, peer->allowed_ips)
410 s = format (s, " %U", format_fib_prefix, &allowed_ip->prefix);
416 static clib_error_t *
417 wg_peer_module_init (vlib_main_t * vm)
420 * use a priority better than interface source, so that
421 * if the same subnet is added to the wg interface and is
422 * used as an allowed IP, then the wireguard soueced prefix
423 * wins and traffic is routed to the endpoint rather than dropped
425 wg_fib_source = fib_source_allocate ("wireguard", 0x2, FIB_SOURCE_BH_API);
430 VLIB_INIT_FUNCTION (wg_peer_module_init);
433 * fd.io coding-style-patch-verification: ON
436 * eval: (c-set-style "gnu")