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/vnet.h>
18 #include <vnet/ip/ip6_link.h>
19 #include <vppinfra/error.h>
20 #include <vlibmemory/api.h>
21 #include <wireguard/wireguard.h>
22 #include <wireguard/wireguard_send.h>
25 ip46_enqueue_packet (vlib_main_t *vm, u32 bi0, int is_ip4)
28 u32 lookup_node_index =
29 is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
31 f = vlib_get_frame_to_node (vm, lookup_node_index);
32 /* f can not be NULL here - frame allocation failure causes panic */
34 u32 *to_next = vlib_frame_vector_args (f);
38 vlib_put_frame_to_node (vm, lookup_node_index, f);
44 wg_buffer_prepend_rewrite (vlib_buffer_t *b0, const wg_peer_t *peer, u8 is_ip4)
48 ip4_udp_header_t *hdr4;
50 vlib_buffer_advance (b0, -sizeof (*hdr4));
52 hdr4 = vlib_buffer_get_current (b0);
54 /* copy only ip4 and udp header; wireguard header not needed */
55 clib_memcpy (hdr4, peer->rewrite, sizeof (ip4_udp_header_t));
58 clib_host_to_net_u16 (b0->current_length - sizeof (ip4_header_t));
59 ip4_header_set_len_w_chksum (&hdr4->ip4,
60 clib_host_to_net_u16 (b0->current_length));
64 ip6_udp_header_t *hdr6;
66 vlib_buffer_advance (b0, -sizeof (*hdr6));
68 hdr6 = vlib_buffer_get_current (b0);
70 /* copy only ip6 and udp header; wireguard header not needed */
71 clib_memcpy (hdr6, peer->rewrite, sizeof (ip6_udp_header_t));
74 clib_host_to_net_u16 (b0->current_length - sizeof (ip6_header_t));
76 hdr6->ip6.payload_length = clib_host_to_net_u16 (b0->current_length);
81 wg_create_buffer (vlib_main_t *vm, const wg_peer_t *peer, const u8 *packet,
82 u32 packet_len, u32 *bi, u8 is_ip4)
87 n_buf0 = vlib_buffer_alloc (vm, bi, 1);
91 b0 = vlib_get_buffer (vm, *bi);
93 u8 *payload = vlib_buffer_get_current (b0);
94 clib_memcpy (payload, packet, packet_len);
96 b0->current_length = packet_len;
98 wg_buffer_prepend_rewrite (b0, peer, is_ip4);
104 wg_send_handshake (vlib_main_t * vm, wg_peer_t * peer, bool is_retry)
106 ASSERT (vm->thread_index == 0);
108 message_handshake_initiation_t packet;
111 peer->timer_handshake_attempts = 0;
113 if (!wg_birthdate_has_expired (peer->last_sent_handshake, REKEY_TIMEOUT) ||
114 wg_peer_is_dead (peer))
117 if (noise_create_initiation (vm,
119 &packet.sender_index,
120 packet.unencrypted_ephemeral,
121 packet.encrypted_static,
122 packet.encrypted_timestamp))
124 packet.header.type = MESSAGE_HANDSHAKE_INITIATION;
125 cookie_maker_mac (&peer->cookie_maker, &packet.macs, &packet,
127 wg_timers_any_authenticated_packet_sent (peer);
128 wg_timers_handshake_initiated (peer);
129 wg_timers_any_authenticated_packet_traversal (peer);
131 peer->last_sent_handshake = vlib_time_now (vm);
136 u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr);
138 if (!wg_create_buffer (vm, peer, (u8 *) &packet, sizeof (packet), &bi0,
142 ip46_enqueue_packet (vm, bi0, is_ip4);
153 wg_send_handshake_thread_fn (void *arg)
155 wg_send_args_t *a = arg;
157 wg_main_t *wmp = &wg_main;
158 wg_peer_t *peer = wg_peer_get (a->peer_idx);
160 wg_send_handshake (wmp->vlib_main, peer, a->is_retry);
165 wg_send_handshake_from_mt (u32 peer_idx, bool is_retry)
168 .peer_idx = peer_idx,
169 .is_retry = is_retry,
172 vl_api_rpc_call_main_thread (wg_send_handshake_thread_fn,
173 (u8 *) & a, sizeof (a));
177 wg_send_keepalive (vlib_main_t * vm, wg_peer_t * peer)
179 ASSERT (vm->thread_index == 0);
181 u32 size_of_packet = message_data_len (0);
182 message_data_t *packet =
183 (message_data_t *) wg_main.per_thread_data[vm->thread_index].data;
186 enum noise_state_crypt state;
188 if (!peer->remote.r_current)
190 wg_send_handshake (vm, peer, false);
195 noise_remote_encrypt (vm,
197 &packet->receiver_index,
198 &packet->counter, NULL, 0, packet->encrypted_data);
200 if (PREDICT_FALSE (state == SC_KEEP_KEY_FRESH))
202 wg_send_handshake (vm, peer, false);
204 else if (PREDICT_FALSE (state == SC_FAILED))
206 wg_peer_update_flags (peer - wg_peer_pool, WG_PEER_ESTABLISHED, false);
211 u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr);
212 packet->header.type = MESSAGE_DATA;
214 if (!wg_create_buffer (vm, peer, (u8 *) packet, size_of_packet, &bi0,
221 ip46_enqueue_packet (vm, bi0, is_ip4);
223 wg_timers_any_authenticated_packet_sent (peer);
224 wg_timers_any_authenticated_packet_traversal (peer);
231 wg_send_handshake_response (vlib_main_t * vm, wg_peer_t * peer)
233 message_handshake_response_t packet;
235 if (noise_create_response (vm,
237 &packet.sender_index,
238 &packet.receiver_index,
239 packet.unencrypted_ephemeral,
240 packet.encrypted_nothing))
242 packet.header.type = MESSAGE_HANDSHAKE_RESPONSE;
243 cookie_maker_mac (&peer->cookie_maker, &packet.macs, &packet,
246 if (noise_remote_begin_session (vm, &peer->remote))
248 wg_timers_session_derived (peer);
249 wg_timers_any_authenticated_packet_sent (peer);
250 wg_timers_any_authenticated_packet_traversal (peer);
251 peer->last_sent_handshake = vlib_time_now (vm);
254 u8 is_ip4 = ip46_address_is_ip4 (&peer->dst.addr);
255 if (!wg_create_buffer (vm, peer, (u8 *) &packet, sizeof (packet),
259 ip46_enqueue_packet (vm, bi0, is_ip4);
268 * fd.io coding-style-patch-verification: ON
271 * eval: (c-set-style "gnu")