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 vec_free (peer->rewrite);
87 vec_free (peer->allowed_ips);
88 vec_free (peer->adj_indices);
92 wg_peer_init (vlib_main_t * vm, wg_peer_t * peer)
94 peer->api_client_by_client_index = hash_create (0, sizeof (u32));
95 peer->api_clients = NULL;
96 wg_peer_clear (vm, peer);
100 wg_peer_adj_stack (wg_peer_t *peer, adj_index_t ai)
105 fib_protocol_t fib_proto;
107 if (!adj_is_valid (ai))
111 sw_if_index = adj->rewrite_header.sw_if_index;
112 u8 is_ip4 = ip46_address_is_ip4 (&peer->src.addr);
113 fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
115 wgi = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
120 if (!vnet_sw_interface_is_admin_up (vnet_get_main (), wgi->sw_if_index) ||
121 !wg_peer_can_send (peer))
123 adj_midchain_delegate_unstack (ai);
129 .fp_len = is_ip4 ? 32 : 128,
130 .fp_proto = fib_proto,
131 .fp_addr = peer->dst.addr,
136 fib_index = fib_table_find (fib_proto, peer->table_id);
138 adj_midchain_delegate_stack (ai, fib_index, &dst);
143 wg_peer_adj_reset_stacking (adj_index_t ai)
145 adj_midchain_delegate_remove (ai);
149 wg_peer_66_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b,
153 ip6_header_t *ip6_out;
154 ip6_header_t *ip6_in;
156 /* Must set locally originated otherwise we're not allowed to
157 fragment the packet later */
158 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
160 ip6_out = vlib_buffer_get_current (b);
161 iph_offset = vnet_buffer (b)->ip.save_rewrite_length;
162 ip6_in = vlib_buffer_get_current (b) + iph_offset;
164 ip6_out->ip_version_traffic_class_and_flow_label =
165 ip6_in->ip_version_traffic_class_and_flow_label;
169 wg_peer_46_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b,
173 ip6_header_t *ip6_out;
174 ip4_header_t *ip4_in;
176 /* Must set locally originated otherwise we're not allowed to
177 fragment the packet later */
178 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
180 ip6_out = vlib_buffer_get_current (b);
181 iph_offset = vnet_buffer (b)->ip.save_rewrite_length;
182 ip4_in = vlib_buffer_get_current (b) + iph_offset;
184 u32 vtcfl = 0x6 << 28;
185 vtcfl |= ip4_in->tos << 20;
186 vtcfl |= vnet_buffer (b)->ip.flow_hash & 0x000fffff;
188 ip6_out->ip_version_traffic_class_and_flow_label =
189 clib_host_to_net_u32 (vtcfl);
192 static adj_midchain_fixup_t
193 wg_peer_get_fixup (wg_peer_t *peer, vnet_link_t lt)
195 if (!ip46_address_is_ip4 (&peer->dst.addr))
197 if (lt == VNET_LINK_IP4)
198 return (wg_peer_46_fixup);
199 if (lt == VNET_LINK_IP6)
200 return (wg_peer_66_fixup);
206 wg_peer_disable (vlib_main_t *vm, wg_peer_t *peer)
208 index_t peeri = peer - wg_peer_pool;
210 wg_timers_stop (peer);
211 wg_peer_update_flags (peeri, WG_PEER_ESTABLISHED, false);
213 for (int i = 0; i < WG_N_TIMERS; i++)
215 peer->timers[i] = ~0;
216 peer->timers_dispatched[i] = 0;
218 peer->timer_handshake_attempts = 0;
220 peer->last_sent_handshake = vlib_time_now (vm) - (REKEY_TIMEOUT + 1);
221 peer->last_sent_packet = 0;
222 peer->last_received_packet = 0;
223 peer->session_derived = 0;
224 peer->rehandshake_started = 0;
226 peer->new_handshake_interval_tick = 0;
227 peer->rehandshake_interval_tick = 0;
229 peer->timer_need_another_keepalive = false;
231 noise_remote_clear (vm, &peer->remote);
235 wg_peer_enable (vlib_main_t *vm, wg_peer_t *peer)
237 index_t peeri = peer - wg_peer_pool;
239 u8 public_key[NOISE_PUBLIC_KEY_LEN];
241 wg_if = wg_if_get (wg_if_find_by_sw_if_index (peer->wg_sw_if_index));
242 clib_memcpy (public_key, peer->remote.r_public, NOISE_PUBLIC_KEY_LEN);
244 noise_remote_init (&peer->remote, peeri, public_key, wg_if->local_idx);
246 wg_send_handshake (vm, peer, false);
247 if (peer->persistent_keepalive_interval != 0)
249 wg_send_keepalive (vm, peer);
254 wg_peer_if_admin_state_change (index_t peeri, void *data)
257 adj_index_t *adj_index;
258 vlib_main_t *vm = vlib_get_main ();
260 peer = wg_peer_get (peeri);
261 vec_foreach (adj_index, peer->adj_indices)
263 wg_peer_adj_stack (peer, *adj_index);
266 if (vnet_sw_interface_is_admin_up (vnet_get_main (), peer->wg_sw_if_index))
268 wg_peer_enable (vm, peer);
272 wg_peer_disable (vm, peer);
275 return (WALK_CONTINUE);
279 wg_peer_if_adj_change (index_t peeri, void *data)
281 adj_index_t *adj_index = data;
282 adj_midchain_fixup_t fixup;
285 fib_prefix_t *allowed_ip;
287 adj = adj_get (*adj_index);
289 peer = wg_peer_get (peeri);
290 vec_foreach (allowed_ip, peer->allowed_ips)
292 if (fib_prefix_is_cover_addr_46 (allowed_ip,
293 &adj->sub_type.nbr.next_hop))
295 vec_add1 (peer->adj_indices, *adj_index);
297 vec_validate_init_empty (wg_peer_by_adj_index, *adj_index,
299 wg_peer_by_adj_index[*adj_index] = peeri;
301 fixup = wg_peer_get_fixup (peer, adj_get_link_type (*adj_index));
302 adj_nbr_midchain_update_rewrite (*adj_index, fixup, NULL,
303 ADJ_FLAG_MIDCHAIN_IP_STACK,
304 vec_dup (peer->rewrite));
306 wg_peer_adj_stack (peer, *adj_index);
311 return (WALK_CONTINUE);
315 wg_peer_adj_walk (adj_index_t ai, void *data)
317 return wg_peer_if_adj_change ((*(index_t *) (data)), &ai) == WALK_CONTINUE ?
318 ADJ_WALK_RC_CONTINUE :
323 wg_peer_if_delete (index_t peeri, void *data)
325 wg_peer_remove (peeri);
326 return (WALK_CONTINUE);
330 wg_peer_fill (vlib_main_t *vm, wg_peer_t *peer, u32 table_id,
331 const ip46_address_t *dst, u16 port,
332 u16 persistent_keepalive_interval,
333 const fib_prefix_t *allowed_ips, u32 wg_sw_if_index)
335 index_t perri = peer - wg_peer_pool;
336 wg_peer_endpoint_init (&peer->dst, dst, port);
338 peer->table_id = table_id;
339 peer->wg_sw_if_index = wg_sw_if_index;
340 peer->timer_wheel = &wg_main.timer_wheel;
341 peer->persistent_keepalive_interval = persistent_keepalive_interval;
342 peer->last_sent_handshake = vlib_time_now (vm) - (REKEY_TIMEOUT + 1);
343 wg_peer_update_flags (perri, WG_PEER_STATUS_DEAD, false);
345 const wg_if_t *wgi = wg_if_get (wg_if_find_by_sw_if_index (wg_sw_if_index));
348 return (VNET_API_ERROR_INVALID_INTERFACE);
350 ip_address_to_46 (&wgi->src_ip, &peer->src.addr);
351 peer->src.port = wgi->port;
353 u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr);
354 peer->rewrite = wg_build_rewrite (&peer->src.addr, peer->src.port,
355 &peer->dst.addr, peer->dst.port, is_ip4);
358 vec_validate (peer->allowed_ips, vec_len (allowed_ips) - 1);
359 vec_foreach_index (ii, allowed_ips)
361 peer->allowed_ips[ii] = allowed_ips[ii];
364 fib_protocol_t proto;
365 FOR_EACH_FIB_IP_PROTOCOL (proto)
367 adj_nbr_walk (wg_sw_if_index, proto, wg_peer_adj_walk, &perri);
373 wg_peer_update_flags (index_t peeri, wg_peer_flags flag, bool add_del)
375 wg_peer_t *peer = wg_peer_get (peeri);
376 if ((add_del && (peer->flags & flag)) || (!add_del && !(peer->flags & flag)))
382 wg_api_peer_event (peeri, peer->flags);
386 wg_peer_update_endpoint (index_t peeri, const ip46_address_t *addr, u16 port)
388 wg_peer_t *peer = wg_peer_get (peeri);
390 if (ip46_address_is_equal (&peer->dst.addr, addr) && peer->dst.port == port)
393 wg_peer_endpoint_init (&peer->dst, addr, port);
395 u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr);
396 vec_free (peer->rewrite);
397 peer->rewrite = wg_build_rewrite (&peer->src.addr, peer->src.port,
398 &peer->dst.addr, peer->dst.port, is_ip4);
400 adj_index_t *adj_index;
401 vec_foreach (adj_index, peer->adj_indices)
403 if (adj_is_valid (*adj_index))
405 adj_midchain_fixup_t fixup =
406 wg_peer_get_fixup (peer, adj_get_link_type (*adj_index));
407 adj_nbr_midchain_update_rewrite (*adj_index, fixup, NULL,
408 ADJ_FLAG_MIDCHAIN_IP_STACK,
409 vec_dup (peer->rewrite));
411 wg_peer_adj_reset_stacking (*adj_index);
412 wg_peer_adj_stack (peer, *adj_index);
417 typedef struct wg_peer_upd_ep_args_t_
422 } wg_peer_upd_ep_args_t;
425 wg_peer_update_endpoint_thread_fn (wg_peer_upd_ep_args_t *args)
427 wg_peer_update_endpoint (args->peeri, &args->addr, args->port);
431 wg_peer_update_endpoint_from_mt (index_t peeri, const ip46_address_t *addr,
434 wg_peer_upd_ep_args_t args = {
439 ip46_address_copy (&args.addr, addr);
440 vlib_rpc_call_main_thread (wg_peer_update_endpoint_thread_fn, (u8 *) &args,
445 wg_peer_add (u32 tun_sw_if_index, const u8 public_key[NOISE_PUBLIC_KEY_LEN],
446 u32 table_id, const ip46_address_t *endpoint,
447 const fib_prefix_t *allowed_ips, u16 port,
448 u16 persistent_keepalive, u32 *peer_index)
454 vlib_main_t *vm = vlib_get_main ();
456 if (tun_sw_if_index == ~0)
457 return (VNET_API_ERROR_INVALID_SW_IF_INDEX);
459 wg_if = wg_if_get (wg_if_find_by_sw_if_index (tun_sw_if_index));
461 return (VNET_API_ERROR_INVALID_SW_IF_INDEX);
464 pool_foreach (peer, wg_peer_pool)
466 if (!memcmp (peer->remote.r_public, public_key, NOISE_PUBLIC_KEY_LEN))
468 return (VNET_API_ERROR_ENTRY_ALREADY_EXISTS);
473 if (pool_elts (wg_peer_pool) > MAX_PEERS)
474 return (VNET_API_ERROR_LIMIT_EXCEEDED);
476 pool_get_zero (wg_peer_pool, peer);
478 wg_peer_init (vm, peer);
480 rv = wg_peer_fill (vm, peer, table_id, endpoint, (u16) port,
481 persistent_keepalive, allowed_ips, tun_sw_if_index);
485 wg_peer_clear (vm, peer);
486 pool_put (wg_peer_pool, peer);
490 noise_remote_init (&peer->remote, peer - wg_peer_pool, public_key,
492 cookie_maker_init (&peer->cookie_maker, public_key);
494 if (vnet_sw_interface_is_admin_up (vnet_get_main (), tun_sw_if_index))
496 wg_send_handshake (vm, peer, false);
497 if (peer->persistent_keepalive_interval != 0)
499 wg_send_keepalive (vm, peer);
503 *peer_index = peer - wg_peer_pool;
504 wg_if_peer_add (wg_if, *peer_index);
510 wg_peer_remove (index_t peeri)
512 wg_main_t *wmp = &wg_main;
513 wg_peer_t *peer = NULL;
516 if (pool_is_free_index (wg_peer_pool, peeri))
517 return VNET_API_ERROR_NO_SUCH_ENTRY;
519 peer = pool_elt_at_index (wg_peer_pool, peeri);
521 wgi = wg_if_get (wg_if_find_by_sw_if_index (peer->wg_sw_if_index));
522 wg_if_peer_remove (wgi, peeri);
524 noise_remote_clear (wmp->vlib_main, &peer->remote);
525 wg_peer_clear (wmp->vlib_main, peer);
526 pool_put (wg_peer_pool, peer);
532 wg_peer_walk (wg_peer_walk_cb_t fn, void *data)
537 pool_foreach_index (peeri, wg_peer_pool)
539 if (WALK_STOP == fn(peeri, data))
543 return INDEX_INVALID;
547 format_wg_peer_endpoint (u8 * s, va_list * args)
549 wg_peer_endpoint_t *ep = va_arg (*args, wg_peer_endpoint_t *);
551 s = format (s, "%U:%d", format_ip46_address, &ep->addr, IP46_TYPE_ANY,
558 format_wg_peer (u8 * s, va_list * va)
560 index_t peeri = va_arg (*va, index_t);
561 fib_prefix_t *allowed_ip;
562 adj_index_t *adj_index;
563 u8 key[NOISE_KEY_LEN_BASE64];
566 peer = wg_peer_get (peeri);
567 key_to_base64 (peer->remote.r_public, NOISE_PUBLIC_KEY_LEN, key);
571 "[%d] endpoint:[%U->%U] %U keep-alive:%d flags: %d, api-clients count: %d",
572 peeri, format_wg_peer_endpoint, &peer->src, format_wg_peer_endpoint,
573 &peer->dst, format_vnet_sw_if_index_name, vnet_get_main (),
574 peer->wg_sw_if_index, peer->persistent_keepalive_interval, peer->flags,
575 pool_elts (peer->api_clients));
576 s = format (s, "\n adj:");
577 vec_foreach (adj_index, peer->adj_indices)
579 s = format (s, " %d", *adj_index);
581 s = format (s, "\n key:%=s %U", key, format_hex_bytes,
582 peer->remote.r_public, NOISE_PUBLIC_KEY_LEN);
583 s = format (s, "\n allowed-ips:");
584 vec_foreach (allowed_ip, peer->allowed_ips)
586 s = format (s, " %U", format_fib_prefix, allowed_ip);
593 * fd.io coding-style-patch-verification: ON
596 * eval: (c-set-style "gnu")