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 static_always_inline void
97 wg_output_process_ops (vlib_main_t *vm, vlib_node_runtime_t *node,
98 vnet_crypto_op_t *ops, vlib_buffer_t *b[], u16 *nexts,
101 u32 n_fail, n_ops = vec_len (ops);
102 vnet_crypto_op_t *op = ops;
107 n_fail = n_ops - vnet_crypto_process_ops (vm, op, n_ops);
111 ASSERT (op - ops < n_ops);
113 if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED)
115 u32 bi = op->user_data;
116 b[bi]->error = node->errors[WG_OUTPUT_ERROR_KEYPAIR];
117 nexts[bi] = drop_next;
124 /* is_ip4 - inner header flag */
126 wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
127 vlib_frame_t *frame, u8 is_ip4)
129 wg_main_t *wmp = &wg_main;
130 wg_per_thread_data_t *ptd =
131 vec_elt_at_index (wmp->per_thread_data, vm->thread_index);
132 u32 *from = vlib_frame_vector_args (frame);
133 u32 n_left_from = frame->n_vectors;
134 ip4_udp_wg_header_t *hdr4_out = NULL;
135 ip6_udp_wg_header_t *hdr6_out = NULL;
136 message_data_t *message_data_wg = NULL;
137 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
138 vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops;
139 u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
140 vlib_buffer_t *sync_bufs[VLIB_FRAME_SIZE];
141 u32 thread_index = vm->thread_index;
143 u16 drop_next = WG_OUTPUT_NEXT_ERROR;
145 vlib_get_buffers (vm, from, bufs, n_left_from);
146 vec_reset_length (ptd->crypto_ops);
148 wg_peer_t *peer = NULL;
150 u32 last_adj_index = ~0;
151 index_t peeri = INDEX_INVALID;
153 f64 time = clib_time_now (&vm->clib_time) + vm->time_offset;
155 while (n_left_from > 0)
165 vlib_prefetch_buffer_header (b[2], LOAD);
166 p = vlib_buffer_get_current (b[1]);
167 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
168 CLIB_PREFETCH (vlib_buffer_get_tail (b[1]), CLIB_CACHE_LINE_BYTES,
172 next[0] = WG_OUTPUT_NEXT_ERROR;
174 adj_index = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
176 if (PREDICT_FALSE (last_adj_index != adj_index))
178 peeri = wg_peer_get_by_adj_index (adj_index);
179 peer = wg_peer_get (peeri);
182 if (!peer || wg_peer_is_dead (peer))
184 b[0]->error = node->errors[WG_OUTPUT_ERROR_PEER];
187 if (PREDICT_FALSE (~0 == peer->output_thread_index))
189 /* this is the first packet to use this peer, claim the peer
192 clib_atomic_cmp_and_swap (&peer->output_thread_index, ~0,
193 wg_peer_assign_thread (thread_index));
196 if (PREDICT_TRUE (thread_index != peer->output_thread_index))
198 next[0] = WG_OUTPUT_NEXT_HANDOFF;
202 if (PREDICT_FALSE (!peer->remote.r_current))
204 wg_send_handshake_from_mt (peeri, false);
205 b[0]->error = node->errors[WG_OUTPUT_ERROR_KEYPAIR];
209 is_ip4_out = ip46_address_is_ip4 (&peer->src.addr);
212 hdr4_out = vlib_buffer_get_current (b[0]);
213 message_data_wg = &hdr4_out->wg;
217 hdr6_out = vlib_buffer_get_current (b[0]);
218 message_data_wg = &hdr6_out->wg;
221 iph_offset = vnet_buffer (b[0])->ip.save_rewrite_length;
222 plain_data = vlib_buffer_get_current (b[0]) + iph_offset;
223 plain_data_len = vlib_buffer_length_in_chain (vm, b[0]) - iph_offset;
224 u8 *iv_data = b[0]->pre_data;
226 size_t encrypted_packet_len = message_data_len (plain_data_len);
229 * Ensure there is enough space to write the encrypted data
232 if (PREDICT_FALSE (encrypted_packet_len >= WG_DEFAULT_DATA_SIZE) ||
233 PREDICT_FALSE ((b[0]->current_data + encrypted_packet_len) >=
234 vlib_buffer_get_default_data_size (vm)))
236 b[0]->error = node->errors[WG_OUTPUT_ERROR_TOO_BIG];
240 if (PREDICT_FALSE (last_adj_index != adj_index))
242 wg_timers_any_authenticated_packet_sent_opt (peer, time);
243 wg_timers_data_sent_opt (peer, time);
244 wg_timers_any_authenticated_packet_traversal (peer);
245 last_adj_index = adj_index;
248 enum noise_state_crypt state;
250 state = noise_sync_remote_encrypt (
251 vm, crypto_ops, &peer->remote, &message_data_wg->receiver_index,
252 &message_data_wg->counter, plain_data, plain_data_len, plain_data,
253 n_sync, iv_data, time);
255 if (PREDICT_FALSE (state == SC_KEEP_KEY_FRESH))
257 wg_send_handshake_from_mt (peeri, false);
259 else if (PREDICT_FALSE (state == SC_FAILED))
262 wg_send_handshake_from_mt (peeri, false);
263 wg_peer_update_flags (peeri, WG_PEER_ESTABLISHED, false);
267 /* Here we are sure that can send packet to next node */
268 next[0] = WG_OUTPUT_NEXT_INTERFACE_OUTPUT;
272 hdr4_out->wg.header.type = MESSAGE_DATA;
273 hdr4_out->udp.length = clib_host_to_net_u16 (encrypted_packet_len +
274 sizeof (udp_header_t));
275 b[0]->current_length =
276 (encrypted_packet_len + sizeof (ip4_udp_header_t));
277 ip4_header_set_len_w_chksum (
278 &hdr4_out->ip4, clib_host_to_net_u16 (b[0]->current_length));
282 hdr6_out->wg.header.type = MESSAGE_DATA;
283 hdr6_out->udp.length = clib_host_to_net_u16 (encrypted_packet_len +
284 sizeof (udp_header_t));
285 b[0]->current_length =
286 (encrypted_packet_len + sizeof (ip6_udp_header_t));
287 hdr6_out->ip6.payload_length =
288 clib_host_to_net_u16 (b[0]->current_length);
292 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
293 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
295 wg_output_tun_trace_t *t =
296 vlib_add_trace (vm, node, b[0], sizeof (*t));
299 t->is_ip4 = is_ip4_out;
301 clib_memcpy (t->header, hdr4_out, sizeof (ip4_udp_header_t));
303 clib_memcpy (t->header, hdr6_out, sizeof (ip6_udp_header_t));
307 sync_bufs[n_sync] = b[0];
314 /* wg-output-process-ops */
315 wg_output_process_ops (vm, node, ptd->crypto_ops, sync_bufs, nexts,
318 vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_sync);
319 return frame->n_vectors;
322 VLIB_NODE_FN (wg4_output_tun_node)
323 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
325 return wg_output_tun_inline (vm, node, frame, /* is_ip4 */ 1);
328 VLIB_NODE_FN (wg6_output_tun_node)
329 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
331 return wg_output_tun_inline (vm, node, frame, /* is_ip4 */ 0);
335 VLIB_REGISTER_NODE (wg4_output_tun_node) =
337 .name = "wg4-output-tun",
338 .vector_size = sizeof (u32),
339 .format_trace = format_wg_output_tun_trace,
340 .type = VLIB_NODE_TYPE_INTERNAL,
341 .n_errors = ARRAY_LEN (wg_output_error_strings),
342 .error_strings = wg_output_error_strings,
343 .n_next_nodes = WG_OUTPUT_N_NEXT,
345 [WG_OUTPUT_NEXT_HANDOFF] = "wg4-output-tun-handoff",
346 [WG_OUTPUT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
347 [WG_OUTPUT_NEXT_ERROR] = "error-drop",
351 VLIB_REGISTER_NODE (wg6_output_tun_node) =
353 .name = "wg6-output-tun",
354 .vector_size = sizeof (u32),
355 .format_trace = format_wg_output_tun_trace,
356 .type = VLIB_NODE_TYPE_INTERNAL,
357 .n_errors = ARRAY_LEN (wg_output_error_strings),
358 .error_strings = wg_output_error_strings,
359 .n_next_nodes = WG_OUTPUT_N_NEXT,
361 [WG_OUTPUT_NEXT_HANDOFF] = "wg6-output-tun-handoff",
362 [WG_OUTPUT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
363 [WG_OUTPUT_NEXT_ERROR] = "error-drop",
369 * fd.io coding-style-patch-verification: ON
372 * eval: (c-set-style "gnu")