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Ed Warnickecb9cada2015-12-08 15:45:58 -07001/*
2 * esp_decrypt.c : IPSec ESP decrypt 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
Ed Warnickecb9cada2015-12-08 15:45:58 -070025#define foreach_esp_decrypt_next \
26_(DROP, "error-drop") \
27_(IP4_INPUT, "ip4-input") \
Matus Fabian694265d2016-08-10 01:55:36 -070028_(IP6_INPUT, "ip6-input") \
29_(IPSEC_GRE_INPUT, "ipsec-gre-input")
Ed Warnickecb9cada2015-12-08 15:45:58 -070030
31#define _(v, s) ESP_DECRYPT_NEXT_##v,
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070032typedef enum
33{
Ed Warnickecb9cada2015-12-08 15:45:58 -070034 foreach_esp_decrypt_next
35#undef _
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070036 ESP_DECRYPT_N_NEXT,
Ed Warnickecb9cada2015-12-08 15:45:58 -070037} esp_decrypt_next_t;
38
39
40#define foreach_esp_decrypt_error \
41 _(RX_PKTS, "ESP pkts received") \
42 _(NO_BUFFER, "No buffer (packed dropped)") \
43 _(DECRYPTION_FAILED, "ESP decryption failed") \
44 _(INTEG_ERROR, "Integrity check failed") \
Matus Fabianefc33302016-07-11 07:08:55 -070045 _(REPLAY, "SA replayed packet") \
46 _(NOT_IP, "Not IP packet (dropped)")
Ed Warnickecb9cada2015-12-08 15:45:58 -070047
48
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070049typedef enum
50{
Ed Warnickecb9cada2015-12-08 15:45:58 -070051#define _(sym,str) ESP_DECRYPT_ERROR_##sym,
52 foreach_esp_decrypt_error
53#undef _
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070054 ESP_DECRYPT_N_ERROR,
Ed Warnickecb9cada2015-12-08 15:45:58 -070055} esp_decrypt_error_t;
56
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070057static char *esp_decrypt_error_strings[] = {
Ed Warnickecb9cada2015-12-08 15:45:58 -070058#define _(sym,string) string,
59 foreach_esp_decrypt_error
60#undef _
61};
62
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070063typedef struct
64{
Ed Warnickecb9cada2015-12-08 15:45:58 -070065 ipsec_crypto_alg_t crypto_alg;
66 ipsec_integ_alg_t integ_alg;
67} esp_decrypt_trace_t;
68
69/* packet trace format function */
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070070static u8 *
71format_esp_decrypt_trace (u8 * s, va_list * args)
Ed Warnickecb9cada2015-12-08 15:45:58 -070072{
73 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
74 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070075 esp_decrypt_trace_t *t = va_arg (*args, esp_decrypt_trace_t *);
Ed Warnickecb9cada2015-12-08 15:45:58 -070076
77 s = format (s, "esp: crypto %U integrity %U",
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070078 format_ipsec_crypto_alg, t->crypto_alg,
79 format_ipsec_integ_alg, t->integ_alg);
Ed Warnickecb9cada2015-12-08 15:45:58 -070080 return s;
81}
82
83always_inline void
“mukeshyadav1984”72454dd2017-11-28 10:52:34 -080084esp_decrypt_cbc (ipsec_crypto_alg_t alg,
85 u8 * in, u8 * out, size_t in_len, u8 * key, u8 * iv)
Ed Warnickecb9cada2015-12-08 15:45:58 -070086{
“mukeshyadav1984”430ac932017-11-23 02:39:33 -080087 ipsec_proto_main_t *em = &ipsec_proto_main;
Damjan Marion586afd72017-04-05 19:18:20 +020088 u32 thread_index = vlib_get_thread_index ();
Marco Varlesef616d102017-11-09 15:16:20 +010089#if OPENSSL_VERSION_NUMBER >= 0x10100000L
90 EVP_CIPHER_CTX *ctx = em->per_thread_data[thread_index].decrypt_ctx;
91#else
Damjan Marion586afd72017-04-05 19:18:20 +020092 EVP_CIPHER_CTX *ctx = &(em->per_thread_data[thread_index].decrypt_ctx);
Marco Varlesef616d102017-11-09 15:16:20 +010093#endif
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070094 const EVP_CIPHER *cipher = NULL;
Ed Warnickecb9cada2015-12-08 15:45:58 -070095 int out_len;
96
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070097 ASSERT (alg < IPSEC_CRYPTO_N_ALG);
Ed Warnickecb9cada2015-12-08 15:45:58 -070098
“mukeshyadav1984”430ac932017-11-23 02:39:33 -080099 if (PREDICT_FALSE (em->ipsec_proto_main_crypto_algs[alg].type == 0))
Ed Warnickecb9cada2015-12-08 15:45:58 -0700100 return;
101
Damjan Marion586afd72017-04-05 19:18:20 +0200102 if (PREDICT_FALSE
103 (alg != em->per_thread_data[thread_index].last_decrypt_alg))
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700104 {
“mukeshyadav1984”430ac932017-11-23 02:39:33 -0800105 cipher = em->ipsec_proto_main_crypto_algs[alg].type;
Damjan Marion586afd72017-04-05 19:18:20 +0200106 em->per_thread_data[thread_index].last_decrypt_alg = alg;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700107 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700108
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700109 EVP_DecryptInit_ex (ctx, cipher, NULL, key, iv);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700110
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700111 EVP_DecryptUpdate (ctx, out, &out_len, in, in_len);
112 EVP_DecryptFinal_ex (ctx, out + out_len, &out_len);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700113}
114
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200115always_inline uword
116esp_decrypt_inline (vlib_main_t * vm,
117 vlib_node_runtime_t * node, vlib_frame_t * from_frame,
118 int is_ip6)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700119{
120 u32 n_left_from, *from, next_index, *to_next;
121 ipsec_main_t *im = &ipsec_main;
“mukeshyadav1984”430ac932017-11-23 02:39:33 -0800122 ipsec_proto_main_t *em = &ipsec_proto_main;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700123 u32 *recycle = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700124 from = vlib_frame_vector_args (from_frame);
125 n_left_from = from_frame->n_vectors;
Damjan Marion586afd72017-04-05 19:18:20 +0200126 u32 thread_index = vlib_get_thread_index ();
Ed Warnickecb9cada2015-12-08 15:45:58 -0700127
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700128 ipsec_alloc_empty_buffers (vm, im);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700129
Damjan Marion586afd72017-04-05 19:18:20 +0200130 u32 *empty_buffers = im->empty_buffers[thread_index];
Matus Fabian141977f2016-07-04 05:36:52 -0700131
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700132 if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from))
133 {
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200134 if (is_ip6)
135 vlib_node_increment_counter (vm, esp6_decrypt_node.index,
136 ESP_DECRYPT_ERROR_NO_BUFFER,
137 n_left_from);
138 else
139 vlib_node_increment_counter (vm, esp4_decrypt_node.index,
140 ESP_DECRYPT_ERROR_NO_BUFFER,
141 n_left_from);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700142 goto free_buffers_and_exit;
143 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700144
145 next_index = node->cached_next_index;
146
147 while (n_left_from > 0)
148 {
149 u32 n_left_to_next;
150
151 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
152
153 while (n_left_from > 0 && n_left_to_next > 0)
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700154 {
155 u32 i_bi0, o_bi0 = (u32) ~ 0, next0;
156 vlib_buffer_t *i_b0;
157 vlib_buffer_t *o_b0 = 0;
158 esp_header_t *esp0;
159 ipsec_sa_t *sa0;
160 u32 sa_index0 = ~0;
161 u32 seq;
162 ip4_header_t *ih4 = 0, *oh4 = 0;
163 ip6_header_t *ih6 = 0, *oh6 = 0;
164 u8 tunnel_mode = 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700165
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700166 i_bi0 = from[0];
167 from += 1;
168 n_left_from -= 1;
169 n_left_to_next -= 1;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700170
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700171 next0 = ESP_DECRYPT_NEXT_DROP;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700172
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700173 i_b0 = vlib_get_buffer (vm, i_bi0);
174 esp0 = vlib_buffer_get_current (i_b0);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700175
Damjan Marion9c6ae5f2016-11-15 23:20:01 +0100176 sa_index0 = vnet_buffer (i_b0)->ipsec.sad_index;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700177 sa0 = pool_elt_at_index (im->sad, sa_index0);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700178
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700179 seq = clib_host_to_net_u32 (esp0->seq);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700180
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700181 /* anti-replay check */
182 if (sa0->use_anti_replay)
183 {
184 int rv = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700185
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700186 if (PREDICT_TRUE (sa0->use_esn))
187 rv = esp_replay_check_esn (sa0, seq);
188 else
189 rv = esp_replay_check (sa0, seq);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700190
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700191 if (PREDICT_FALSE (rv))
192 {
193 clib_warning ("anti-replay SPI %u seq %u", sa0->spi, seq);
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200194 if (is_ip6)
195 vlib_node_increment_counter (vm,
196 esp6_decrypt_node.index,
197 ESP_DECRYPT_ERROR_REPLAY, 1);
198 else
199 vlib_node_increment_counter (vm,
200 esp4_decrypt_node.index,
201 ESP_DECRYPT_ERROR_REPLAY, 1);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700202 o_bi0 = i_bi0;
Sergio Gonzalez Monroy73c01102016-09-06 14:06:06 +0100203 to_next[0] = o_bi0;
204 to_next += 1;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700205 goto trace;
206 }
207 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700208
Radu Nicolaucb33dc22017-02-16 16:49:46 +0000209 sa0->total_data_size += i_b0->current_length;
210
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700211 if (PREDICT_TRUE (sa0->integ_alg != IPSEC_INTEG_ALG_NONE))
212 {
213 u8 sig[64];
“mukeshyadav1984”430ac932017-11-23 02:39:33 -0800214 int icv_size =
215 em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
Dave Barachb7b92992018-10-17 10:38:51 -0400216 clib_memset (sig, 0, sizeof (sig));
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700217 u8 *icv =
218 vlib_buffer_get_current (i_b0) + i_b0->current_length -
219 icv_size;
220 i_b0->current_length -= icv_size;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700221
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700222 hmac_calc (sa0->integ_alg, sa0->integ_key, sa0->integ_key_len,
223 (u8 *) esp0, i_b0->current_length, sig, sa0->use_esn,
224 sa0->seq_hi);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700225
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700226 if (PREDICT_FALSE (memcmp (icv, sig, icv_size)))
227 {
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200228 if (is_ip6)
229 vlib_node_increment_counter (vm,
230 esp6_decrypt_node.index,
231 ESP_DECRYPT_ERROR_INTEG_ERROR,
232 1);
233 else
234 vlib_node_increment_counter (vm,
235 esp4_decrypt_node.index,
236 ESP_DECRYPT_ERROR_INTEG_ERROR,
237 1);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700238 o_bi0 = i_bi0;
Sergio Gonzalez Monroy73c01102016-09-06 14:06:06 +0100239 to_next[0] = o_bi0;
240 to_next += 1;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700241 goto trace;
242 }
243 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700244
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700245 if (PREDICT_TRUE (sa0->use_anti_replay))
246 {
247 if (PREDICT_TRUE (sa0->use_esn))
248 esp_replay_advance_esn (sa0, seq);
249 else
250 esp_replay_advance (sa0, seq);
251 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700252
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700253 /* grab free buffer */
254 uword last_empty_buffer = vec_len (empty_buffers) - 1;
255 o_bi0 = empty_buffers[last_empty_buffer];
Sergio Gonzalez Monroy73c01102016-09-06 14:06:06 +0100256 to_next[0] = o_bi0;
257 to_next += 1;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700258 o_b0 = vlib_get_buffer (vm, o_bi0);
259 vlib_prefetch_buffer_with_index (vm,
260 empty_buffers[last_empty_buffer -
261 1], STORE);
262 _vec_len (empty_buffers) = last_empty_buffer;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700263
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700264 /* add old buffer to the recycle list */
265 vec_add1 (recycle, i_bi0);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700266
“mukeshyadav1984”72454dd2017-11-28 10:52:34 -0800267 if ((sa0->crypto_alg >= IPSEC_CRYPTO_ALG_AES_CBC_128 &&
268 sa0->crypto_alg <= IPSEC_CRYPTO_ALG_AES_CBC_256) ||
269 (sa0->crypto_alg >= IPSEC_CRYPTO_ALG_DES_CBC &&
270 sa0->crypto_alg <= IPSEC_CRYPTO_ALG_3DES_CBC))
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700271 {
“mukeshyadav1984”72454dd2017-11-28 10:52:34 -0800272 const int BLOCK_SIZE =
273 em->ipsec_proto_main_crypto_algs[sa0->crypto_alg].block_size;;
274 const int IV_SIZE =
275 em->ipsec_proto_main_crypto_algs[sa0->crypto_alg].iv_size;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700276 esp_footer_t *f0;
277 u8 ip_hdr_size = 0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700278
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700279 int blocks =
280 (i_b0->current_length - sizeof (esp_header_t) -
281 IV_SIZE) / BLOCK_SIZE;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700282
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700283 o_b0->current_data = sizeof (ethernet_header_t);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700284
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700285 /* transport mode */
286 if (PREDICT_FALSE (!sa0->is_tunnel && !sa0->is_tunnel_ip6))
287 {
288 tunnel_mode = 0;
Szymon Sliwa8640dbd2018-03-19 15:14:31 +0000289
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200290 if (is_ip6)
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700291 {
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200292 ih6 =
293 (ip6_header_t *) ((u8 *) esp0 -
294 sizeof (ip6_header_t));
295 ip_hdr_size = sizeof (ip6_header_t);
296 oh6 = vlib_buffer_get_current (o_b0);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700297 }
298 else
299 {
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200300 ih4 =
301 (ip4_header_t *) ((u8 *) esp0 -
302 sizeof (ip4_header_t));
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700303 oh4 = vlib_buffer_get_current (o_b0);
304 ip_hdr_size = sizeof (ip4_header_t);
305 }
306 }
Matus Fabianefc33302016-07-11 07:08:55 -0700307
“mukeshyadav1984”72454dd2017-11-28 10:52:34 -0800308 esp_decrypt_cbc (sa0->crypto_alg,
309 esp0->data + IV_SIZE,
310 (u8 *) vlib_buffer_get_current (o_b0) +
311 ip_hdr_size, BLOCK_SIZE * blocks,
312 sa0->crypto_key, esp0->data);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700313
“mukeshyadav1984”72454dd2017-11-28 10:52:34 -0800314 o_b0->current_length = (blocks * BLOCK_SIZE) - 2 + ip_hdr_size;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700315 o_b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
316 f0 =
317 (esp_footer_t *) ((u8 *) vlib_buffer_get_current (o_b0) +
318 o_b0->current_length);
319 o_b0->current_length -= f0->pad_length;
Matus Fabianefc33302016-07-11 07:08:55 -0700320
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700321 /* tunnel mode */
322 if (PREDICT_TRUE (tunnel_mode))
323 {
324 if (PREDICT_TRUE (f0->next_header == IP_PROTOCOL_IP_IN_IP))
Matus Fabian694265d2016-08-10 01:55:36 -0700325 {
326 next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
327 oh4 = vlib_buffer_get_current (o_b0);
328 }
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700329 else if (f0->next_header == IP_PROTOCOL_IPV6)
330 next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
331 else
332 {
333 clib_warning ("next header: 0x%x", f0->next_header);
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200334 if (is_ip6)
335 vlib_node_increment_counter (vm,
336 esp6_decrypt_node.index,
337 ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
338 1);
339 else
340 vlib_node_increment_counter (vm,
341 esp4_decrypt_node.index,
342 ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
343 1);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700344 o_b0 = 0;
345 goto trace;
346 }
347 }
348 /* transport mode */
349 else
350 {
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200351 if (is_ip6)
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700352 {
353 next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
354 oh6->ip_version_traffic_class_and_flow_label =
355 ih6->ip_version_traffic_class_and_flow_label;
356 oh6->protocol = f0->next_header;
357 oh6->hop_limit = ih6->hop_limit;
358 oh6->src_address.as_u64[0] = ih6->src_address.as_u64[0];
359 oh6->src_address.as_u64[1] = ih6->src_address.as_u64[1];
360 oh6->dst_address.as_u64[0] = ih6->dst_address.as_u64[0];
361 oh6->dst_address.as_u64[1] = ih6->dst_address.as_u64[1];
362 oh6->payload_length =
363 clib_host_to_net_u16 (vlib_buffer_length_in_chain
364 (vm,
365 o_b0) - sizeof (ip6_header_t));
366 }
367 else
368 {
369 next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
370 oh4->ip_version_and_header_length = 0x45;
371 oh4->tos = ih4->tos;
372 oh4->fragment_id = 0;
373 oh4->flags_and_fragment_offset = 0;
374 oh4->ttl = ih4->ttl;
375 oh4->protocol = f0->next_header;
376 oh4->src_address.as_u32 = ih4->src_address.as_u32;
377 oh4->dst_address.as_u32 = ih4->dst_address.as_u32;
378 oh4->length =
379 clib_host_to_net_u16 (vlib_buffer_length_in_chain
380 (vm, o_b0));
381 oh4->checksum = ip4_header_checksum (oh4);
382 }
383 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700384
Matus Fabian694265d2016-08-10 01:55:36 -0700385 /* for IPSec-GRE tunnel next node is ipsec-gre-input */
386 if (PREDICT_FALSE
Damjan Marion9c6ae5f2016-11-15 23:20:01 +0100387 ((vnet_buffer (i_b0)->ipsec.flags) &
Matus Fabian694265d2016-08-10 01:55:36 -0700388 IPSEC_FLAG_IPSEC_GRE_TUNNEL))
389 next0 = ESP_DECRYPT_NEXT_IPSEC_GRE_INPUT;
390
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700391 vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
Matthew Smith02e14b52017-09-14 09:05:35 -0500392 vnet_buffer (o_b0)->sw_if_index[VLIB_RX] =
393 vnet_buffer (i_b0)->sw_if_index[VLIB_RX];
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700394 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700395
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700396 trace:
397 if (PREDICT_FALSE (i_b0->flags & VLIB_BUFFER_IS_TRACED))
398 {
399 if (o_b0)
400 {
401 o_b0->flags |= VLIB_BUFFER_IS_TRACED;
402 o_b0->trace_index = i_b0->trace_index;
Damjan Marion3f54b182016-08-16 11:27:02 +0200403 esp_decrypt_trace_t *tr =
404 vlib_add_trace (vm, node, o_b0, sizeof (*tr));
405 tr->crypto_alg = sa0->crypto_alg;
406 tr->integ_alg = sa0->integ_alg;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700407 }
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700408 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700409
410 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700411 n_left_to_next, o_bi0, next0);
412 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700413 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
414 }
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200415 if (is_ip6)
416 vlib_node_increment_counter (vm, esp6_decrypt_node.index,
417 ESP_DECRYPT_ERROR_RX_PKTS,
418 from_frame->n_vectors);
419 else
420 vlib_node_increment_counter (vm, esp4_decrypt_node.index,
421 ESP_DECRYPT_ERROR_RX_PKTS,
422 from_frame->n_vectors);
423
Ed Warnickecb9cada2015-12-08 15:45:58 -0700424
425free_buffers_and_exit:
Damjan Marion3f54b182016-08-16 11:27:02 +0200426 if (recycle)
427 vlib_buffer_free (vm, recycle, vec_len (recycle));
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700428 vec_free (recycle);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700429 return from_frame->n_vectors;
430}
431
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200432static uword
433esp4_decrypt_node_fn (vlib_main_t * vm,
434 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
435{
436 return esp_decrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ );
437}
Ed Warnickecb9cada2015-12-08 15:45:58 -0700438
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700439/* *INDENT-OFF* */
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200440VLIB_REGISTER_NODE (esp4_decrypt_node) = {
441 .function = esp4_decrypt_node_fn,
442 .name = "esp4-decrypt",
Ed Warnickecb9cada2015-12-08 15:45:58 -0700443 .vector_size = sizeof (u32),
444 .format_trace = format_esp_decrypt_trace,
445 .type = VLIB_NODE_TYPE_INTERNAL,
446
447 .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
448 .error_strings = esp_decrypt_error_strings,
449
450 .n_next_nodes = ESP_DECRYPT_N_NEXT,
451 .next_nodes = {
452#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
453 foreach_esp_decrypt_next
454#undef _
455 },
456};
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700457/* *INDENT-ON* */
Ed Warnickecb9cada2015-12-08 15:45:58 -0700458
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200459VLIB_NODE_FUNCTION_MULTIARCH (esp4_decrypt_node, esp4_decrypt_node_fn);
460
461static uword
462esp6_decrypt_node_fn (vlib_main_t * vm,
463 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
464{
465 return esp_decrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ );
466}
467
468/* *INDENT-OFF* */
469VLIB_REGISTER_NODE (esp6_decrypt_node) = {
470 .function = esp6_decrypt_node_fn,
471 .name = "esp6-decrypt",
472 .vector_size = sizeof (u32),
473 .format_trace = format_esp_decrypt_trace,
474 .type = VLIB_NODE_TYPE_INTERNAL,
475
476 .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
477 .error_strings = esp_decrypt_error_strings,
478
479 .n_next_nodes = ESP_DECRYPT_N_NEXT,
480 .next_nodes = {
481#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
482 foreach_esp_decrypt_next
483#undef _
484 },
485};
486/* *INDENT-ON* */
487
488VLIB_NODE_FUNCTION_MULTIARCH (esp6_decrypt_node, esp6_decrypt_node_fn);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700489/*
490 * fd.io coding-style-patch-verification: ON
491 *
492 * Local Variables:
493 * eval: (c-set-style "gnu")
494 * End:
495 */