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 <vlib/vlib.h>
18 #include <vnet/vnet.h>
19 #include <vppinfra/error.h>
21 #include <wireguard/wireguard.h>
22 #include <wireguard/wireguard_send.h>
24 #define foreach_wg_output_error \
26 _(PEER, "Peer error") \
27 _(KEYPAIR, "Keypair error") \
28 _(TOO_BIG, "packet too big") \
32 #define _(sym,str) WG_OUTPUT_ERROR_##sym,
33 foreach_wg_output_error
38 static char *wg_output_error_strings[] = {
39 #define _(sym,string) string,
40 foreach_wg_output_error
47 WG_OUTPUT_NEXT_HANDOFF,
48 WG_OUTPUT_NEXT_INTERFACE_OUTPUT,
55 u8 header[sizeof (ip6_udp_header_t)];
57 } wg_output_tun_trace_t;
60 format_ip4_udp_header (u8 * s, va_list * args)
62 ip4_udp_header_t *hdr4 = va_arg (*args, ip4_udp_header_t *);
64 s = format (s, "%U:$U", format_ip4_header, &hdr4->ip4, format_udp_header,
70 format_ip6_udp_header (u8 *s, va_list *args)
72 ip6_udp_header_t *hdr6 = va_arg (*args, ip6_udp_header_t *);
74 s = format (s, "%U:$U", format_ip6_header, &hdr6->ip6, format_udp_header,
79 /* packet trace format function */
81 format_wg_output_tun_trace (u8 * s, va_list * args)
83 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
84 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
86 wg_output_tun_trace_t *t = va_arg (*args, wg_output_tun_trace_t *);
88 s = format (s, "peer: %d\n", t->peer);
89 s = format (s, " Encrypted packet: ");
91 s = t->is_ip4 ? format (s, "%U", format_ip4_udp_header, t->header) :
92 format (s, "%U", format_ip6_udp_header, t->header);
96 /* is_ip4 - inner header flag */
98 wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
99 vlib_frame_t *frame, u8 is_ip4)
103 ip4_udp_header_t *hdr4_out = NULL;
104 ip6_udp_header_t *hdr6_out = NULL;
105 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
106 u16 nexts[VLIB_FRAME_SIZE], *next;
107 u32 thread_index = vm->thread_index;
109 from = vlib_frame_vector_args (frame);
110 n_left_from = frame->n_vectors;
114 vlib_get_buffers (vm, from, bufs, n_left_from);
116 wg_main_t *wmp = &wg_main;
117 wg_peer_t *peer = NULL;
119 while (n_left_from > 0)
127 next[0] = WG_OUTPUT_NEXT_ERROR;
129 wg_peer_get_by_adj_index (vnet_buffer (b[0])->ip.adj_index[VLIB_TX]);
130 peer = wg_peer_get (peeri);
132 if (wg_peer_is_dead (peer))
134 b[0]->error = node->errors[WG_OUTPUT_ERROR_PEER];
137 if (PREDICT_FALSE (~0 == peer->output_thread_index))
139 /* this is the first packet to use this peer, claim the peer
142 clib_atomic_cmp_and_swap (&peer->output_thread_index, ~0,
143 wg_peer_assign_thread (thread_index));
146 if (PREDICT_TRUE (thread_index != peer->output_thread_index))
148 next[0] = WG_OUTPUT_NEXT_HANDOFF;
152 if (PREDICT_FALSE (!peer->remote.r_current))
154 wg_send_handshake_from_mt (peeri, false);
155 b[0]->error = node->errors[WG_OUTPUT_ERROR_KEYPAIR];
159 is_ip4_out = ip46_address_is_ip4 (&peer->src.addr);
162 hdr4_out = vlib_buffer_get_current (b[0]);
166 hdr6_out = vlib_buffer_get_current (b[0]);
169 iph_offset = vnet_buffer (b[0])->ip.save_rewrite_length;
170 plain_data = vlib_buffer_get_current (b[0]) + iph_offset;
171 plain_data_len = vlib_buffer_length_in_chain (vm, b[0]) - iph_offset;
173 size_t encrypted_packet_len = message_data_len (plain_data_len);
176 * Ensure there is enough space to write the encrypted data
179 if (PREDICT_FALSE (encrypted_packet_len >= WG_DEFAULT_DATA_SIZE) ||
180 PREDICT_FALSE ((b[0]->current_data + encrypted_packet_len) >=
181 vlib_buffer_get_default_data_size (vm)))
183 b[0]->error = node->errors[WG_OUTPUT_ERROR_TOO_BIG];
187 message_data_t *encrypted_packet =
188 (message_data_t *) wmp->per_thread_data[thread_index].data;
190 enum noise_state_crypt state;
191 state = noise_remote_encrypt (
192 vm, &peer->remote, &encrypted_packet->receiver_index,
193 &encrypted_packet->counter, plain_data, plain_data_len,
194 encrypted_packet->encrypted_data);
196 if (PREDICT_FALSE (state == SC_KEEP_KEY_FRESH))
198 wg_send_handshake_from_mt (peeri, false);
200 else if (PREDICT_FALSE (state == SC_FAILED))
203 wg_send_handshake_from_mt (peeri, false);
204 wg_peer_update_flags (peeri, WG_PEER_ESTABLISHED, false);
208 /* Here we are sure that can send packet to next node */
209 next[0] = WG_OUTPUT_NEXT_INTERFACE_OUTPUT;
210 encrypted_packet->header.type = MESSAGE_DATA;
212 clib_memcpy (plain_data, (u8 *) encrypted_packet, encrypted_packet_len);
216 hdr4_out->udp.length = clib_host_to_net_u16 (encrypted_packet_len +
217 sizeof (udp_header_t));
218 b[0]->current_length =
219 (encrypted_packet_len + sizeof (ip4_udp_header_t));
220 ip4_header_set_len_w_chksum (
221 &hdr4_out->ip4, clib_host_to_net_u16 (b[0]->current_length));
225 hdr6_out->udp.length = clib_host_to_net_u16 (encrypted_packet_len +
226 sizeof (udp_header_t));
227 b[0]->current_length =
228 (encrypted_packet_len + sizeof (ip6_udp_header_t));
229 hdr6_out->ip6.payload_length =
230 clib_host_to_net_u16 (b[0]->current_length);
233 wg_timers_any_authenticated_packet_sent (peer);
234 wg_timers_data_sent (peer);
235 wg_timers_any_authenticated_packet_traversal (peer);
238 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
239 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
241 wg_output_tun_trace_t *t =
242 vlib_add_trace (vm, node, b[0], sizeof (*t));
245 t->is_ip4 = is_ip4_out;
247 clib_memcpy (t->header, hdr4_out, sizeof (*hdr4_out));
249 clib_memcpy (t->header, hdr6_out, sizeof (*hdr6_out));
258 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
259 return frame->n_vectors;
262 VLIB_NODE_FN (wg4_output_tun_node)
263 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
265 return wg_output_tun_inline (vm, node, frame, /* is_ip4 */ 1);
268 VLIB_NODE_FN (wg6_output_tun_node)
269 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
271 return wg_output_tun_inline (vm, node, frame, /* is_ip4 */ 0);
275 VLIB_REGISTER_NODE (wg4_output_tun_node) =
277 .name = "wg4-output-tun",
278 .vector_size = sizeof (u32),
279 .format_trace = format_wg_output_tun_trace,
280 .type = VLIB_NODE_TYPE_INTERNAL,
281 .n_errors = ARRAY_LEN (wg_output_error_strings),
282 .error_strings = wg_output_error_strings,
283 .n_next_nodes = WG_OUTPUT_N_NEXT,
285 [WG_OUTPUT_NEXT_HANDOFF] = "wg4-output-tun-handoff",
286 [WG_OUTPUT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
287 [WG_OUTPUT_NEXT_ERROR] = "error-drop",
291 VLIB_REGISTER_NODE (wg6_output_tun_node) =
293 .name = "wg6-output-tun",
294 .vector_size = sizeof (u32),
295 .format_trace = format_wg_output_tun_trace,
296 .type = VLIB_NODE_TYPE_INTERNAL,
297 .n_errors = ARRAY_LEN (wg_output_error_strings),
298 .error_strings = wg_output_error_strings,
299 .n_next_nodes = WG_OUTPUT_N_NEXT,
301 [WG_OUTPUT_NEXT_HANDOFF] = "wg6-output-tun-handoff",
302 [WG_OUTPUT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
303 [WG_OUTPUT_NEXT_ERROR] = "error-drop",
309 * fd.io coding-style-patch-verification: ON
312 * eval: (c-set-style "gnu")