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>
25 #include <vnet/tunnel/tunnel_dp.h>
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, const ip46_address_t *addr,
42 ip46_address_copy (&ep->addr, addr);
47 wg_peer_clear (vlib_main_t * vm, wg_peer_t * peer)
49 index_t perri = peer - wg_peer_pool;
50 wg_timers_stop (peer);
51 wg_peer_update_flags (perri, WG_PEER_ESTABLISHED, false);
52 wg_peer_update_flags (perri, WG_PEER_STATUS_DEAD, true);
53 for (int i = 0; i < WG_N_TIMERS; i++)
56 peer->timers_dispatched[i] = 0;
59 peer->last_sent_handshake = vlib_time_now (vm) - (REKEY_TIMEOUT + 1);
61 clib_memset (&peer->cookie_maker, 0, sizeof (peer->cookie_maker));
63 wg_peer_endpoint_reset (&peer->src);
64 wg_peer_endpoint_reset (&peer->dst);
66 adj_index_t *adj_index;
67 vec_foreach (adj_index, peer->adj_indices)
69 wg_peer_by_adj_index[*adj_index] = INDEX_INVALID;
71 if (adj_is_valid (*adj_index))
72 adj_midchain_delegate_unstack (*adj_index);
74 peer->input_thread_index = ~0;
75 peer->output_thread_index = ~0;
76 peer->timer_wheel = 0;
77 peer->persistent_keepalive_interval = 0;
78 peer->timer_handshake_attempts = 0;
79 peer->last_sent_packet = 0;
80 peer->last_received_packet = 0;
81 peer->session_derived = 0;
82 peer->rehandshake_started = 0;
83 peer->new_handshake_interval_tick = 0;
84 peer->rehandshake_interval_tick = 0;
85 peer->timer_need_another_keepalive = false;
86 peer->handshake_is_sent = false;
87 vec_free (peer->rewrite);
88 vec_free (peer->allowed_ips);
89 vec_free (peer->adj_indices);
93 wg_peer_init (vlib_main_t * vm, wg_peer_t * peer)
95 peer->api_client_by_client_index = hash_create (0, sizeof (u32));
96 peer->api_clients = NULL;
97 wg_peer_clear (vm, peer);
101 wg_peer_adj_stack (wg_peer_t *peer, adj_index_t ai)
106 fib_protocol_t fib_proto;
108 if (!adj_is_valid (ai))
112 sw_if_index = adj->rewrite_header.sw_if_index;
113 u8 is_ip4 = ip46_address_is_ip4 (&peer->src.addr);
114 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
116 wgi = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
121 if (!vnet_sw_interface_is_admin_up (vnet_get_main (), wgi->sw_if_index) ||
122 !wg_peer_can_send (peer))
124 adj_midchain_delegate_unstack (ai);
129 .fp_len = is_ip4 ? 32 : 128,
130 .fp_proto = fib_proto,
131 .fp_addr = peer->dst.addr,
135 fib_index = fib_table_find (fib_proto, peer->table_id);
137 adj_midchain_delegate_stack (ai, fib_index, &dst);
142 wg_peer_adj_reset_stacking (adj_index_t ai)
144 adj_midchain_delegate_remove (ai);
148 wg_peer_66_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b,
152 ip6_header_t *ip6_out;
153 ip6_header_t *ip6_in;
155 /* Must set locally originated otherwise we're not allowed to
156 fragment the packet later */
157 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
159 ip6_out = vlib_buffer_get_current (b);
160 iph_offset = vnet_buffer (b)->ip.save_rewrite_length;
161 ip6_in = vlib_buffer_get_current (b) + iph_offset;
163 ip6_out->ip_version_traffic_class_and_flow_label =
164 ip6_in->ip_version_traffic_class_and_flow_label;
168 wg_peer_46_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b,
172 ip6_header_t *ip6_out;
173 ip4_header_t *ip4_in;
175 /* Must set locally originated otherwise we're not allowed to
176 fragment the packet later */
177 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
179 ip6_out = vlib_buffer_get_current (b);
180 iph_offset = vnet_buffer (b)->ip.save_rewrite_length;
181 ip4_in = vlib_buffer_get_current (b) + iph_offset;
183 u32 vtcfl = 0x6 << 28;
184 vtcfl |= ip4_in->tos << 20;
185 vtcfl |= vnet_buffer (b)->ip.flow_hash & 0x000fffff;
187 ip6_out->ip_version_traffic_class_and_flow_label =
188 clib_host_to_net_u32 (vtcfl);
191 static adj_midchain_fixup_t
192 wg_peer_get_fixup (wg_peer_t *peer, vnet_link_t lt)
194 if (!ip46_address_is_ip4 (&peer->dst.addr))
196 if (lt == VNET_LINK_IP4)
197 return (wg_peer_46_fixup);
198 if (lt == VNET_LINK_IP6)
199 return (wg_peer_66_fixup);
205 wg_peer_disable (vlib_main_t *vm, wg_peer_t *peer)
207 index_t peeri = peer - wg_peer_pool;
209 wg_timers_stop (peer);
210 wg_peer_update_flags (peeri, WG_PEER_ESTABLISHED, false);
212 for (int i = 0; i < WG_N_TIMERS; i++)
214 peer->timers[i] = ~0;
215 peer->timers_dispatched[i] = 0;
217 peer->timer_handshake_attempts = 0;
219 peer->last_sent_handshake = vlib_time_now (vm) - (REKEY_TIMEOUT + 1);
220 peer->last_sent_packet = 0;
221 peer->last_received_packet = 0;
222 peer->session_derived = 0;
223 peer->rehandshake_started = 0;
225 peer->new_handshake_interval_tick = 0;
226 peer->rehandshake_interval_tick = 0;
228 peer->timer_need_another_keepalive = false;
230 noise_remote_clear (vm, &peer->remote);
234 wg_peer_enable (vlib_main_t *vm, wg_peer_t *peer)
236 index_t peeri = peer - wg_peer_pool;
238 u8 public_key[NOISE_PUBLIC_KEY_LEN];
240 wg_if = wg_if_get (wg_if_find_by_sw_if_index (peer->wg_sw_if_index));
241 clib_memcpy (public_key, peer->remote.r_public, NOISE_PUBLIC_KEY_LEN);
243 noise_remote_init (vm, &peer->remote, peeri, public_key, wg_if->local_idx);
245 wg_timers_send_first_handshake (peer);
249 wg_peer_if_admin_state_change (index_t peeri, void *data)
252 adj_index_t *adj_index;
253 vlib_main_t *vm = vlib_get_main ();
255 peer = wg_peer_get (peeri);
256 vec_foreach (adj_index, peer->adj_indices)
258 wg_peer_adj_stack (peer, *adj_index);
261 if (vnet_sw_interface_is_admin_up (vnet_get_main (), peer->wg_sw_if_index))
263 wg_peer_enable (vm, peer);
267 wg_peer_disable (vm, peer);
270 return (WALK_CONTINUE);
274 wg_peer_if_adj_change (index_t peeri, void *data)
276 adj_index_t *adj_index = data;
277 adj_midchain_fixup_t fixup;
280 fib_prefix_t *allowed_ip;
282 adj = adj_get (*adj_index);
284 peer = wg_peer_get (peeri);
285 vec_foreach (allowed_ip, peer->allowed_ips)
287 if (fib_prefix_is_cover_addr_46 (allowed_ip,
288 &adj->sub_type.nbr.next_hop))
290 vec_add1 (peer->adj_indices, *adj_index);
292 vec_validate_init_empty (wg_peer_by_adj_index, *adj_index,
294 wg_peer_by_adj_index[*adj_index] = peeri;
296 fixup = wg_peer_get_fixup (peer, adj_get_link_type (*adj_index));
297 adj_nbr_midchain_update_rewrite (*adj_index, fixup, NULL,
298 ADJ_FLAG_MIDCHAIN_IP_STACK,
299 vec_dup (peer->rewrite));
301 wg_peer_adj_stack (peer, *adj_index);
306 return (WALK_CONTINUE);
310 wg_peer_adj_walk (adj_index_t ai, void *data)
312 return wg_peer_if_adj_change ((*(index_t *) (data)), &ai) == WALK_CONTINUE ?
313 ADJ_WALK_RC_CONTINUE :
318 wg_peer_if_delete (index_t peeri, void *data)
320 wg_peer_remove (peeri);
321 return (WALK_CONTINUE);
325 wg_peer_fill (vlib_main_t *vm, wg_peer_t *peer, u32 table_id,
326 const ip46_address_t *dst, u16 port,
327 u16 persistent_keepalive_interval,
328 const fib_prefix_t *allowed_ips, u32 wg_sw_if_index)
330 index_t perri = peer - wg_peer_pool;
331 wg_peer_endpoint_init (&peer->dst, dst, port);
333 peer->table_id = table_id;
334 peer->wg_sw_if_index = wg_sw_if_index;
335 peer->timer_wheel = &wg_main.timer_wheel;
336 peer->persistent_keepalive_interval = persistent_keepalive_interval;
337 peer->last_sent_handshake = vlib_time_now (vm) - (REKEY_TIMEOUT + 1);
338 wg_peer_update_flags (perri, WG_PEER_STATUS_DEAD, false);
340 const wg_if_t *wgi = wg_if_get (wg_if_find_by_sw_if_index (wg_sw_if_index));
343 return (VNET_API_ERROR_INVALID_INTERFACE);
345 ip_address_to_46 (&wgi->src_ip, &peer->src.addr);
346 peer->src.port = wgi->port;
348 u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr);
349 peer->rewrite = wg_build_rewrite (&peer->src.addr, peer->src.port,
350 &peer->dst.addr, peer->dst.port, is_ip4);
353 vec_validate (peer->allowed_ips, vec_len (allowed_ips) - 1);
354 vec_foreach_index (ii, allowed_ips)
356 peer->allowed_ips[ii] = allowed_ips[ii];
359 fib_protocol_t proto;
360 FOR_EACH_FIB_IP_PROTOCOL (proto)
362 adj_nbr_walk (wg_sw_if_index, proto, wg_peer_adj_walk, &perri);
368 wg_peer_update_flags (index_t peeri, wg_peer_flags flag, bool add_del)
370 wg_peer_t *peer = wg_peer_get (peeri);
371 if ((add_del && (peer->flags & flag)) || (!add_del && !(peer->flags & flag)))
377 wg_api_peer_event (peeri, peer->flags);
381 wg_peer_update_endpoint (index_t peeri, const ip46_address_t *addr, u16 port)
383 wg_peer_t *peer = wg_peer_get (peeri);
385 if (ip46_address_is_equal (&peer->dst.addr, addr) && peer->dst.port == port)
388 wg_peer_endpoint_init (&peer->dst, addr, port);
390 u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr);
391 vec_free (peer->rewrite);
392 peer->rewrite = wg_build_rewrite (&peer->src.addr, peer->src.port,
393 &peer->dst.addr, peer->dst.port, is_ip4);
395 adj_index_t *adj_index;
396 vec_foreach (adj_index, peer->adj_indices)
398 if (adj_is_valid (*adj_index))
400 adj_midchain_fixup_t fixup =
401 wg_peer_get_fixup (peer, adj_get_link_type (*adj_index));
402 adj_nbr_midchain_update_rewrite (*adj_index, fixup, NULL,
403 ADJ_FLAG_MIDCHAIN_IP_STACK,
404 vec_dup (peer->rewrite));
406 wg_peer_adj_reset_stacking (*adj_index);
407 wg_peer_adj_stack (peer, *adj_index);
412 typedef struct wg_peer_upd_ep_args_t_
417 } wg_peer_upd_ep_args_t;
420 wg_peer_update_endpoint_thread_fn (wg_peer_upd_ep_args_t *args)
422 wg_peer_update_endpoint (args->peeri, &args->addr, args->port);
426 wg_peer_update_endpoint_from_mt (index_t peeri, const ip46_address_t *addr,
429 wg_peer_upd_ep_args_t args = {
434 ip46_address_copy (&args.addr, addr);
435 vlib_rpc_call_main_thread (wg_peer_update_endpoint_thread_fn, (u8 *) &args,
440 wg_peer_add (u32 tun_sw_if_index, const u8 public_key[NOISE_PUBLIC_KEY_LEN],
441 u32 table_id, const ip46_address_t *endpoint,
442 const fib_prefix_t *allowed_ips, u16 port,
443 u16 persistent_keepalive, u32 *peer_index)
449 vlib_main_t *vm = vlib_get_main ();
451 if (tun_sw_if_index == ~0)
452 return (VNET_API_ERROR_INVALID_SW_IF_INDEX);
454 wg_if = wg_if_get (wg_if_find_by_sw_if_index (tun_sw_if_index));
456 return (VNET_API_ERROR_INVALID_SW_IF_INDEX);
458 pool_foreach (peer, wg_peer_pool)
460 if (!memcmp (peer->remote.r_public, public_key, NOISE_PUBLIC_KEY_LEN))
462 return (VNET_API_ERROR_ENTRY_ALREADY_EXISTS);
466 if (pool_elts (wg_peer_pool) > MAX_PEERS)
467 return (VNET_API_ERROR_LIMIT_EXCEEDED);
469 pool_get_zero (wg_peer_pool, peer);
471 wg_peer_init (vm, peer);
473 rv = wg_peer_fill (vm, peer, table_id, endpoint, (u16) port,
474 persistent_keepalive, allowed_ips, tun_sw_if_index);
478 wg_peer_clear (vm, peer);
479 pool_put (wg_peer_pool, peer);
483 noise_remote_init (vm, &peer->remote, peer - wg_peer_pool, public_key,
485 cookie_maker_init (&peer->cookie_maker, public_key);
487 if (vnet_sw_interface_is_admin_up (vnet_get_main (), tun_sw_if_index))
489 wg_timers_send_first_handshake (peer);
492 *peer_index = peer - wg_peer_pool;
493 wg_if_peer_add (wg_if, *peer_index);
499 wg_peer_remove (index_t peeri)
501 wg_main_t *wmp = &wg_main;
502 wg_peer_t *peer = NULL;
505 if (pool_is_free_index (wg_peer_pool, peeri))
506 return VNET_API_ERROR_NO_SUCH_ENTRY;
508 peer = pool_elt_at_index (wg_peer_pool, peeri);
510 wgi = wg_if_get (wg_if_find_by_sw_if_index (peer->wg_sw_if_index));
511 wg_if_peer_remove (wgi, peeri);
513 noise_remote_clear (wmp->vlib_main, &peer->remote);
514 wg_peer_clear (wmp->vlib_main, peer);
515 pool_put (wg_peer_pool, peer);
521 wg_peer_walk (wg_peer_walk_cb_t fn, void *data)
525 pool_foreach_index (peeri, wg_peer_pool)
527 if (WALK_STOP == fn(peeri, data))
530 return INDEX_INVALID;
534 format_wg_peer_endpoint (u8 * s, va_list * args)
536 wg_peer_endpoint_t *ep = va_arg (*args, wg_peer_endpoint_t *);
538 s = format (s, "%U:%d", format_ip46_address, &ep->addr, IP46_TYPE_ANY,
545 format_wg_peer (u8 * s, va_list * va)
547 index_t peeri = va_arg (*va, index_t);
548 fib_prefix_t *allowed_ip;
549 adj_index_t *adj_index;
550 u8 key[NOISE_KEY_LEN_BASE64];
553 peer = wg_peer_get (peeri);
554 key_to_base64 (peer->remote.r_public, NOISE_PUBLIC_KEY_LEN, key);
558 "[%d] endpoint:[%U->%U] %U keep-alive:%d flags: %d, api-clients count: %d",
559 peeri, format_wg_peer_endpoint, &peer->src, format_wg_peer_endpoint,
560 &peer->dst, format_vnet_sw_if_index_name, vnet_get_main (),
561 peer->wg_sw_if_index, peer->persistent_keepalive_interval, peer->flags,
562 pool_elts (peer->api_clients));
563 s = format (s, "\n adj:");
564 vec_foreach (adj_index, peer->adj_indices)
566 s = format (s, " %d", *adj_index);
568 s = format (s, "\n key:%=s %U", key, format_hex_bytes,
569 peer->remote.r_public, NOISE_PUBLIC_KEY_LEN);
570 s = format (s, "\n allowed-ips:");
571 vec_foreach (allowed_ip, peer->allowed_ips)
573 s = format (s, " %U", format_fib_prefix, allowed_ip);
580 * fd.io coding-style-patch-verification: ON
583 * eval: (c-set-style "gnu")