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_ip6)
28 u32 lookup_node_index =
29 is_ip6 ? ip6_lookup_node.index : ip4_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)
46 ip4_udp_header_t *hdr;
48 vlib_buffer_advance (b0, -sizeof (*hdr));
50 hdr = vlib_buffer_get_current (b0);
51 clib_memcpy (hdr, peer->rewrite, vec_len (peer->rewrite));
54 clib_host_to_net_u16 (b0->current_length - sizeof (ip4_header_t));
55 ip4_header_set_len_w_chksum (&hdr->ip4,
56 clib_host_to_net_u16 (b0->current_length));
60 wg_create_buffer (vlib_main_t * vm,
61 const wg_peer_t * peer,
62 const u8 * packet, u32 packet_len, u32 * bi)
67 n_buf0 = vlib_buffer_alloc (vm, bi, 1);
71 b0 = vlib_get_buffer (vm, *bi);
73 u8 *payload = vlib_buffer_get_current (b0);
74 clib_memcpy (payload, packet, packet_len);
76 b0->current_length = packet_len;
78 wg_buffer_prepend_rewrite (b0, peer);
84 wg_send_handshake (vlib_main_t * vm, wg_peer_t * peer, bool is_retry)
86 ASSERT (vm->thread_index == 0);
88 message_handshake_initiation_t packet;
91 peer->timer_handshake_attempts = 0;
93 if (!wg_birthdate_has_expired (peer->last_sent_handshake,
94 REKEY_TIMEOUT) || peer->is_dead)
97 if (noise_create_initiation (vm,
100 packet.unencrypted_ephemeral,
101 packet.encrypted_static,
102 packet.encrypted_timestamp))
104 packet.header.type = MESSAGE_HANDSHAKE_INITIATION;
105 cookie_maker_mac (&peer->cookie_maker, &packet.macs, &packet,
107 wg_timers_any_authenticated_packet_sent (peer);
108 wg_timers_handshake_initiated (peer);
109 wg_timers_any_authenticated_packet_traversal (peer);
111 peer->last_sent_handshake = vlib_time_now (vm);
117 if (!wg_create_buffer (vm, peer, (u8 *) & packet, sizeof (packet), &bi0))
120 ip46_enqueue_packet (vm, bi0, false);
131 wg_send_handshake_thread_fn (void *arg)
133 wg_send_args_t *a = arg;
135 wg_main_t *wmp = &wg_main;
136 wg_peer_t *peer = wg_peer_get (a->peer_idx);
138 wg_send_handshake (wmp->vlib_main, peer, a->is_retry);
143 wg_send_handshake_from_mt (u32 peer_idx, bool is_retry)
146 .peer_idx = peer_idx,
147 .is_retry = is_retry,
150 vl_api_rpc_call_main_thread (wg_send_handshake_thread_fn,
151 (u8 *) & a, sizeof (a));
155 wg_send_keepalive (vlib_main_t * vm, wg_peer_t * peer)
157 ASSERT (vm->thread_index == 0);
159 u32 size_of_packet = message_data_len (0);
160 message_data_t *packet =
161 (message_data_t *) wg_main.per_thread_data[vm->thread_index].data;
164 enum noise_state_crypt state;
166 if (!peer->remote.r_current)
168 wg_send_handshake (vm, peer, false);
173 noise_remote_encrypt (vm,
175 &packet->receiver_index,
176 &packet->counter, NULL, 0, packet->encrypted_data);
178 if (PREDICT_FALSE (state == SC_KEEP_KEY_FRESH))
180 wg_send_handshake (vm, peer, false);
182 else if (PREDICT_FALSE (state == SC_FAILED))
188 packet->header.type = MESSAGE_DATA;
190 if (!wg_create_buffer (vm, peer, (u8 *) packet, size_of_packet, &bi0))
196 ip46_enqueue_packet (vm, bi0, false);
198 wg_timers_any_authenticated_packet_sent (peer);
199 wg_timers_any_authenticated_packet_traversal (peer);
206 wg_send_handshake_response (vlib_main_t * vm, wg_peer_t * peer)
208 message_handshake_response_t packet;
210 if (noise_create_response (vm,
212 &packet.sender_index,
213 &packet.receiver_index,
214 packet.unencrypted_ephemeral,
215 packet.encrypted_nothing))
217 packet.header.type = MESSAGE_HANDSHAKE_RESPONSE;
218 cookie_maker_mac (&peer->cookie_maker, &packet.macs, &packet,
221 if (noise_remote_begin_session (vm, &peer->remote))
223 wg_timers_session_derived (peer);
224 wg_timers_any_authenticated_packet_sent (peer);
225 wg_timers_any_authenticated_packet_traversal (peer);
226 peer->last_sent_handshake = vlib_time_now (vm);
229 if (!wg_create_buffer (vm, peer, (u8 *) & packet,
230 sizeof (packet), &bi0))
233 ip46_enqueue_packet (vm, bi0, false);
244 * fd.io coding-style-patch-verification: ON
247 * eval: (c-set-style "gnu")