Line data Source code
1 : /*
2 : * ipsec_tun_protect_in.c : IPSec interface input node
3 : *
4 : * Copyright (c) 2015 Cisco and/or its affiliates.
5 : * Licensed under the Apache License, Version 2.0 (the "License");
6 : * you may not use this file except in compliance with the License.
7 : * You may obtain a copy of the License at:
8 : *
9 : * http://www.apache.org/licenses/LICENSE-2.0
10 : *
11 : * Unless required by applicable law or agreed to in writing, software
12 : * distributed under the License is distributed on an "AS IS" BASIS,
13 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 : * See the License for the specific language governing permissions and
15 : * limitations under the License.
16 : */
17 :
18 : #include <vnet/vnet.h>
19 : #include <vnet/api_errno.h>
20 : #include <vnet/ip/ip.h>
21 :
22 : #include <vnet/ipsec/ipsec.h>
23 : #include <vnet/ipsec/esp.h>
24 : #include <vnet/ipsec/ipsec_io.h>
25 : #include <vnet/ipsec/ipsec_punt.h>
26 : #include <vnet/ipsec/ipsec_tun.h>
27 : #include <vnet/ipsec/ipsec.api_enum.h>
28 : #include <vnet/ip/ip4_input.h>
29 :
30 : typedef vl_counter_ipsec_tun_enum_t ipsec_tun_protect_input_error_t;
31 :
32 : typedef enum ipsec_tun_next_t_
33 : {
34 : #define _(v, s) IPSEC_TUN_PROTECT_NEXT_##v,
35 : foreach_ipsec_input_next
36 : #undef _
37 : IPSEC_TUN_PROTECT_N_NEXT,
38 : } ipsec_tun_next_t;
39 :
40 : typedef struct
41 : {
42 : union
43 : {
44 : ipsec4_tunnel_kv_t kv4;
45 : ipsec6_tunnel_kv_t kv6;
46 : };
47 : u8 is_ip6;
48 : u32 seq;
49 : } ipsec_tun_protect_input_trace_t;
50 :
51 : static u8 *
52 11828 : format_ipsec_tun_protect_input_trace (u8 * s, va_list * args)
53 : {
54 11828 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
55 11828 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
56 11828 : ipsec_tun_protect_input_trace_t *t =
57 : va_arg (*args, ipsec_tun_protect_input_trace_t *);
58 :
59 11828 : if (t->is_ip6)
60 3288 : s = format (s, "IPSec: %U seq %u",
61 : format_ipsec6_tunnel_kv, &t->kv6, t->seq);
62 : else
63 8540 : s = format (s, "IPSec: %U seq %u sa %d",
64 : format_ipsec4_tunnel_kv, &t->kv4, t->seq);
65 11828 : return s;
66 : }
67 :
68 : always_inline u16
69 1143 : ipsec_ip4_if_no_tunnel (vlib_node_runtime_t * node,
70 : vlib_buffer_t * b,
71 : const esp_header_t * esp, const ip4_header_t * ip4)
72 : {
73 1143 : if (PREDICT_FALSE (0 == esp->spi))
74 : {
75 7 : b->error = node->errors[IPSEC_TUN_ERROR_SPI_0];
76 7 : b->punt_reason = ipsec_punt_reason[(ip4->protocol == IP_PROTOCOL_UDP ?
77 7 : IPSEC_PUNT_IP4_SPI_UDP_0 :
78 : IPSEC_PUNT_IP4_NO_SUCH_TUNNEL)];
79 : }
80 : else
81 : {
82 1136 : b->error = node->errors[IPSEC_TUN_ERROR_NO_TUNNEL];
83 1136 : b->punt_reason = ipsec_punt_reason[IPSEC_PUNT_IP4_NO_SUCH_TUNNEL];
84 : }
85 1143 : return VNET_DEVICE_INPUT_NEXT_PUNT;
86 : }
87 :
88 : always_inline u16
89 127 : ipsec_ip6_if_no_tunnel (vlib_node_runtime_t *node, vlib_buffer_t *b,
90 : const esp_header_t *esp, const ip6_header_t *ip6)
91 : {
92 127 : if (PREDICT_FALSE (0 == esp->spi))
93 : {
94 0 : b->error = node->errors[IPSEC_TUN_ERROR_SPI_0];
95 0 : b->punt_reason = ipsec_punt_reason[(ip6->protocol == IP_PROTOCOL_UDP ?
96 0 : IPSEC_PUNT_IP6_SPI_UDP_0 :
97 : IPSEC_PUNT_IP6_NO_SUCH_TUNNEL)];
98 : }
99 : else
100 : {
101 127 : b->error = node->errors[IPSEC_TUN_ERROR_NO_TUNNEL];
102 127 : b->punt_reason = ipsec_punt_reason[IPSEC_PUNT_IP6_NO_SUCH_TUNNEL];
103 : }
104 :
105 127 : return VNET_DEVICE_INPUT_NEXT_PUNT;
106 : }
107 :
108 : always_inline uword
109 302 : ipsec_tun_protect_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
110 : vlib_frame_t * from_frame, int is_ip6)
111 : {
112 302 : ipsec_main_t *im = &ipsec_main;
113 302 : vnet_main_t *vnm = im->vnet_main;
114 302 : vnet_interface_main_t *vim = &vnm->interface_main;
115 :
116 302 : int is_trace = node->flags & VLIB_NODE_FLAG_TRACE;
117 302 : u32 thread_index = vm->thread_index;
118 :
119 : u32 n_left_from, *from;
120 : u16 nexts[VLIB_FRAME_SIZE], *next;
121 : vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
122 :
123 302 : from = vlib_frame_vector_args (from_frame);
124 302 : n_left_from = from_frame->n_vectors;
125 :
126 302 : vlib_get_buffers (vm, from, bufs, n_left_from);
127 302 : b = bufs;
128 302 : next = nexts;
129 :
130 604 : clib_memset_u16 (
131 302 : nexts, is_ip6 ? im->esp6_decrypt_next_index : im->esp4_decrypt_next_index,
132 : n_left_from);
133 :
134 302 : u64 n_bytes = 0, n_packets = 0;
135 302 : u32 n_disabled = 0, n_no_tunnel = 0;
136 :
137 302 : u32 last_sw_if_index = ~0;
138 302 : ipsec_tun_lkup_result_t last_result = {
139 : .tun_index = ~0
140 : };
141 : ipsec4_tunnel_kv_t last_key4;
142 : ipsec6_tunnel_kv_t last_key6;
143 : ipsec_tun_lkup_result_t itr0;
144 :
145 : vlib_combined_counter_main_t *rx_counter;
146 : vlib_combined_counter_main_t *drop_counter;
147 :
148 302 : if (is_ip6)
149 82 : clib_memset (&last_key6, 0xff, sizeof (last_key6));
150 : else
151 220 : last_key4.key = ~0;
152 :
153 302 : rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
154 302 : drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
155 :
156 20997 : while (n_left_from > 0)
157 : {
158 : u32 sw_if_index0, len0, hdr_sz0;
159 20695 : clib_bihash_kv_24_16_t bkey60 = { 0 };
160 20695 : clib_bihash_kv_8_16_t bkey40 = { 0 };
161 : ipsec4_tunnel_kv_t *key40;
162 : ipsec6_tunnel_kv_t *key60;
163 : ip4_header_t *ip40;
164 : ip6_header_t *ip60;
165 : esp_header_t *esp0;
166 : u16 buf_rewind0;
167 :
168 20695 : ip40 =
169 20695 : (ip4_header_t *) (b[0]->data + vnet_buffer (b[0])->l3_hdr_offset);
170 :
171 20695 : key60 = (ipsec6_tunnel_kv_t *) & bkey60;
172 20695 : key40 = (ipsec4_tunnel_kv_t *) & bkey40;
173 :
174 20695 : if (is_ip6)
175 : {
176 6575 : ip60 = (ip6_header_t *) ip40;
177 6575 : if (ip60->protocol == IP_PROTOCOL_UDP)
178 : {
179 : /* NAT UDP port 4500 case, don't advance any more */
180 611 : esp0 = (esp_header_t *) ((u8 *) ip60 + sizeof (ip6_header_t) +
181 : sizeof (udp_header_t));
182 611 : hdr_sz0 = 0;
183 611 : buf_rewind0 = sizeof (ip6_header_t) + sizeof (udp_header_t);
184 :
185 611 : const udp_header_t *udp0 =
186 : (udp_header_t *) ((u8 *) ip60 + sizeof (ip6_header_t));
187 :
188 : /* length 9 = sizeof(udp_header) + 1 byte of special SPI */
189 611 : if (clib_net_to_host_u16 (udp0->length) == 9 &&
190 93 : esp0->spi_bytes[0] == 0xff)
191 : {
192 31 : b[0]->error = node->errors[IPSEC_TUN_ERROR_NAT_KEEPALIVE];
193 :
194 31 : next[0] = VNET_DEVICE_INPUT_NEXT_IP6_DROP;
195 31 : len0 = 0;
196 :
197 31 : vlib_buffer_advance (b[0], -buf_rewind0);
198 31 : goto trace00;
199 : }
200 : }
201 : else
202 : {
203 5964 : esp0 = (esp_header_t *) (ip60 + 1);
204 5964 : buf_rewind0 = hdr_sz0 = sizeof (ip6_header_t);
205 : }
206 : }
207 : else
208 : {
209 14120 : if (ip40->protocol == IP_PROTOCOL_UDP)
210 : {
211 : /* NAT UDP port 4500 case, don't advance any more */
212 840 : esp0 =
213 840 : (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40) +
214 : sizeof (udp_header_t));
215 840 : hdr_sz0 = 0;
216 840 : buf_rewind0 = ip4_header_bytes (ip40) + sizeof (udp_header_t);
217 :
218 840 : const udp_header_t *udp0 =
219 840 : (udp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40));
220 :
221 : /* length 9 = sizeof(udp_header) + 1 byte of special SPI */
222 840 : if (clib_net_to_host_u16 (udp0->length) == 9 &&
223 186 : esp0->spi_bytes[0] == 0xff)
224 : {
225 62 : b[0]->error = node->errors[IPSEC_TUN_ERROR_NAT_KEEPALIVE];
226 :
227 62 : next[0] = VNET_DEVICE_INPUT_NEXT_IP4_DROP;
228 62 : len0 = 0;
229 :
230 62 : vlib_buffer_advance (b[0], -buf_rewind0);
231 62 : goto trace00;
232 : }
233 : }
234 : else
235 : {
236 13280 : esp0 = (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40));
237 13280 : buf_rewind0 = hdr_sz0 = ip4_header_bytes (ip40);
238 : }
239 : }
240 :
241 : /* stats for the tunnel include all the data after the IP header
242 : just like a norml IP-IP tunnel */
243 20602 : vlib_buffer_advance (b[0], hdr_sz0);
244 20602 : len0 = vlib_buffer_length_in_chain (vm, b[0]);
245 :
246 20602 : if (len0 < sizeof (esp_header_t))
247 : {
248 186 : b[0]->error = node->errors[IPSEC_TUN_ERROR_TOO_SHORT];
249 :
250 186 : next[0] = is_ip6 ? VNET_DEVICE_INPUT_NEXT_IP6_DROP :
251 : VNET_DEVICE_INPUT_NEXT_IP4_DROP;
252 186 : vlib_buffer_advance (b[0], -buf_rewind0);
253 186 : goto trace00;
254 : }
255 :
256 20416 : if (is_ip6)
257 : {
258 6482 : key60->key.remote_ip = ip60->src_address;
259 6482 : key60->key.spi = esp0->spi;
260 6482 : key60->key.__pad = 0;
261 :
262 6482 : if (memcmp (key60, &last_key6, sizeof (last_key6)) == 0)
263 : {
264 0 : clib_memcpy_fast (&itr0, &last_result, sizeof (itr0));
265 : }
266 : else
267 : {
268 : int rv =
269 6482 : clib_bihash_search_inline_24_16 (&im->tun6_protect_by_key,
270 : &bkey60);
271 6482 : if (!rv)
272 : {
273 6355 : clib_memcpy_fast (&itr0, &bkey60.value, sizeof (itr0));
274 6355 : clib_memcpy_fast (&last_result, &bkey60.value,
275 : sizeof (last_result));
276 6355 : clib_memcpy_fast (&last_key6, key60, sizeof (last_key6));
277 : }
278 : else
279 : {
280 127 : next[0] = ipsec_ip6_if_no_tunnel (node, b[0], esp0, ip60);
281 127 : vlib_buffer_advance (b[0], -buf_rewind0);
282 127 : n_no_tunnel++;
283 127 : goto trace00;
284 : }
285 : }
286 : }
287 : else
288 : {
289 13934 : ipsec4_tunnel_mk_key (key40, &ip40->src_address, esp0->spi);
290 :
291 13934 : if (key40->key == last_key4.key)
292 : {
293 12595 : clib_memcpy_fast (&itr0, &last_result, sizeof (itr0));
294 : }
295 : else
296 : {
297 : int rv =
298 1339 : clib_bihash_search_inline_8_16 (&im->tun4_protect_by_key,
299 : &bkey40);
300 1339 : if (!rv)
301 : {
302 196 : clib_memcpy_fast (&itr0, &bkey40.value, sizeof (itr0));
303 196 : clib_memcpy_fast (&last_result, &bkey40.value,
304 : sizeof (last_result));
305 196 : last_key4.key = key40->key;
306 : }
307 : else
308 : {
309 1143 : next[0] = ipsec_ip4_if_no_tunnel (node, b[0], esp0, ip40);
310 1143 : vlib_buffer_advance (b[0], -buf_rewind0);
311 1143 : n_no_tunnel++;
312 1143 : goto trace00;
313 : }
314 : }
315 : }
316 :
317 19146 : vnet_buffer (b[0])->ipsec.sad_index = itr0.sa_index;
318 19146 : vnet_buffer (b[0])->ipsec.protect_index = itr0.tun_index;
319 :
320 19146 : sw_if_index0 = itr0.sw_if_index;
321 19146 : vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index0;
322 :
323 19146 : if (PREDICT_FALSE (!vnet_sw_interface_is_admin_up (vnm, sw_if_index0)))
324 : {
325 381 : vlib_increment_combined_counter
326 : (drop_counter, thread_index, sw_if_index0, 1, len0);
327 381 : n_disabled++;
328 381 : b[0]->error = node->errors[IPSEC_TUN_ERROR_DISABLED];
329 381 : next[0] = is_ip6 ? VNET_DEVICE_INPUT_NEXT_IP6_DROP :
330 : VNET_DEVICE_INPUT_NEXT_IP4_DROP;
331 381 : goto trace00;
332 : }
333 : else
334 : {
335 18765 : if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
336 : {
337 18494 : n_packets++;
338 18494 : n_bytes += len0;
339 : }
340 : else
341 : {
342 271 : if (n_packets && !(itr0.flags & IPSEC_PROTECT_ENCAPED))
343 : {
344 9 : vlib_increment_combined_counter
345 : (rx_counter, thread_index, last_sw_if_index,
346 : n_packets, n_bytes);
347 : }
348 :
349 271 : last_sw_if_index = sw_if_index0;
350 271 : n_packets = 1;
351 271 : n_bytes = len0;
352 : }
353 :
354 : //IPSEC_TUN_PROTECT_NEXT_DECRYPT;
355 18765 : next[0] = is_ip6 ? im->esp6_decrypt_tun_next_index :
356 12664 : im->esp4_decrypt_tun_next_index;
357 :
358 18765 : if (itr0.flags & IPSEC_PROTECT_FEAT)
359 : {
360 : u32 next32;
361 494 : u8 arc = feature_main.device_input_feature_arc_index;
362 :
363 494 : next32 = next[0];
364 494 : vnet_feature_arc_start (arc, sw_if_index0, &next32, b[0]);
365 494 : next[0] = next32;
366 : }
367 : }
368 18271 : trace00:
369 20695 : if (PREDICT_FALSE (is_trace))
370 : {
371 20695 : if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
372 : {
373 : ipsec_tun_protect_input_trace_t *tr =
374 20695 : vlib_add_trace (vm, node, b[0], sizeof (*tr));
375 20695 : if (is_ip6)
376 6575 : clib_memcpy (&tr->kv6, &bkey60, sizeof (tr->kv6));
377 : else
378 14120 : clib_memcpy (&tr->kv4, &bkey40, sizeof (tr->kv4));
379 20695 : tr->is_ip6 = is_ip6;
380 20695 : tr->seq = (len0 >= sizeof (*esp0) ?
381 20695 : clib_host_to_net_u32 (esp0->seq) : ~0);
382 : }
383 : }
384 :
385 : /* next */
386 20695 : b += 1;
387 20695 : next += 1;
388 20695 : n_left_from -= 1;
389 : }
390 :
391 302 : if (n_packets && !(itr0.flags & IPSEC_PROTECT_ENCAPED))
392 244 : vlib_increment_combined_counter (rx_counter,
393 : thread_index,
394 : last_sw_if_index, n_packets, n_bytes);
395 :
396 302 : vlib_node_increment_counter (vm, node->node_index, IPSEC_TUN_ERROR_RX,
397 302 : from_frame->n_vectors -
398 302 : (n_disabled + n_no_tunnel));
399 302 : vlib_node_increment_counter (vm, node->node_index, IPSEC_TUN_ERROR_NO_TUNNEL,
400 : n_no_tunnel);
401 :
402 302 : vlib_buffer_enqueue_to_next (vm, node, from, nexts, from_frame->n_vectors);
403 :
404 302 : return from_frame->n_vectors;
405 : }
406 :
407 2520 : VLIB_NODE_FN (ipsec4_tun_input_node) (vlib_main_t * vm,
408 : vlib_node_runtime_t * node,
409 : vlib_frame_t * from_frame)
410 : {
411 220 : return ipsec_tun_protect_input_inline (vm, node, from_frame, 0);
412 : }
413 :
414 : /* *INDENT-OFF* */
415 183788 : VLIB_REGISTER_NODE (ipsec4_tun_input_node) = {
416 : .name = "ipsec4-tun-input",
417 : .vector_size = sizeof (u32),
418 : .format_trace = format_ipsec_tun_protect_input_trace,
419 : .type = VLIB_NODE_TYPE_INTERNAL,
420 : .n_errors = IPSEC_TUN_N_ERROR,
421 : .error_counters = ipsec_tun_error_counters,
422 : .sibling_of = "device-input",
423 : };
424 : /* *INDENT-ON* */
425 :
426 2382 : VLIB_NODE_FN (ipsec6_tun_input_node) (vlib_main_t * vm,
427 : vlib_node_runtime_t * node,
428 : vlib_frame_t * from_frame)
429 : {
430 82 : return ipsec_tun_protect_input_inline (vm, node, from_frame, 1);
431 : }
432 :
433 : /* *INDENT-OFF* */
434 183788 : VLIB_REGISTER_NODE (ipsec6_tun_input_node) = {
435 : .name = "ipsec6-tun-input",
436 : .vector_size = sizeof (u32),
437 : .format_trace = format_ipsec_tun_protect_input_trace,
438 : .type = VLIB_NODE_TYPE_INTERNAL,
439 : .n_errors = IPSEC_TUN_N_ERROR,
440 : .error_counters = ipsec_tun_error_counters,
441 : .sibling_of = "device-input",
442 : };
443 : /* *INDENT-ON* */
444 :
445 : /*
446 : * fd.io coding-style-patch-verification: ON
447 : *
448 : * Local Variables:
449 : * eval: (c-set-style "gnu")
450 : * End:
451 : */
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