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Vector Packet Processing
esp_decrypt.c
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1 /*
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 
25 #define foreach_esp_decrypt_next \
26 _(DROP, "error-drop") \
27 _(IP4_INPUT, "ip4-input") \
28 _(IP6_INPUT, "ip6-input") \
29 _(IPSEC_GRE_INPUT, "ipsec-gre-input")
30 
31 #define _(v, s) ESP_DECRYPT_NEXT_##v,
32 typedef enum
33 {
35 #undef _
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") \
45  _(REPLAY, "SA replayed packet") \
46  _(NOT_IP, "Not IP packet (dropped)")
47 
48 
49 typedef enum
50 {
51 #define _(sym,str) ESP_DECRYPT_ERROR_##sym,
53 #undef _
56 
57 static char *esp_decrypt_error_strings[] = {
58 #define _(sym,string) string,
60 #undef _
61 };
62 
63 typedef struct
64 {
68 
69 /* packet trace format function */
70 static u8 *
71 format_esp_decrypt_trace (u8 * s, va_list * args)
72 {
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 *);
75  esp_decrypt_trace_t *t = va_arg (*args, esp_decrypt_trace_t *);
76 
77  s = format (s, "esp: crypto %U integrity %U",
80  return s;
81 }
82 
83 always_inline void
85  u8 * in, u8 * out, size_t in_len, u8 * key, u8 * iv)
86 {
88  u32 thread_index = vlib_get_thread_index ();
89 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
90  EVP_CIPHER_CTX *ctx = em->per_thread_data[thread_index].decrypt_ctx;
91 #else
92  EVP_CIPHER_CTX *ctx = &(em->per_thread_data[thread_index].decrypt_ctx);
93 #endif
94  const EVP_CIPHER *cipher = NULL;
95  int out_len;
96 
97  ASSERT (alg < IPSEC_CRYPTO_N_ALG);
98 
100  return;
101 
102  if (PREDICT_FALSE
103  (alg != em->per_thread_data[thread_index].last_decrypt_alg))
104  {
105  cipher = em->ipsec_proto_main_crypto_algs[alg].type;
106  em->per_thread_data[thread_index].last_decrypt_alg = alg;
107  }
108 
109  EVP_DecryptInit_ex (ctx, cipher, NULL, key, iv);
110 
111  EVP_DecryptUpdate (ctx, out, &out_len, in, in_len);
112  EVP_DecryptFinal_ex (ctx, out + out_len, &out_len);
113 }
114 
117  vlib_node_runtime_t * node, vlib_frame_t * from_frame,
118  int is_ip6)
119 {
120  u32 n_left_from, *from, next_index, *to_next;
121  ipsec_main_t *im = &ipsec_main;
123  u32 *recycle = 0;
124  from = vlib_frame_vector_args (from_frame);
125  n_left_from = from_frame->n_vectors;
126  u32 thread_index = vlib_get_thread_index ();
127 
128  ipsec_alloc_empty_buffers (vm, im);
129 
130  u32 *empty_buffers = im->empty_buffers[thread_index];
131 
132  if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from))
133  {
135  ESP_DECRYPT_ERROR_NO_BUFFER, n_left_from);
136  goto free_buffers_and_exit;
137  }
138 
139  next_index = node->cached_next_index;
140 
141  while (n_left_from > 0)
142  {
143  u32 n_left_to_next;
144 
145  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
146 
147  while (n_left_from > 0 && n_left_to_next > 0)
148  {
149  u32 i_bi0, o_bi0 = (u32) ~ 0, next0;
150  vlib_buffer_t *i_b0;
151  vlib_buffer_t *o_b0 = 0;
152  esp_header_t *esp0;
153  ipsec_sa_t *sa0;
154  u32 sa_index0 = ~0;
155  u32 seq;
156  ip4_header_t *ih4 = 0, *oh4 = 0;
157  ip6_header_t *ih6 = 0, *oh6 = 0;
158  u8 tunnel_mode = 1;
159 
160  i_bi0 = from[0];
161  from += 1;
162  n_left_from -= 1;
163  n_left_to_next -= 1;
164 
165  next0 = ESP_DECRYPT_NEXT_DROP;
166 
167  i_b0 = vlib_get_buffer (vm, i_bi0);
168  esp0 = vlib_buffer_get_current (i_b0);
169 
170  sa_index0 = vnet_buffer (i_b0)->ipsec.sad_index;
171  sa0 = pool_elt_at_index (im->sad, sa_index0);
172 
173  seq = clib_host_to_net_u32 (esp0->seq);
174 
175  /* anti-replay check */
176  if (sa0->use_anti_replay)
177  {
178  int rv = 0;
179 
180  if (PREDICT_TRUE (sa0->use_esn))
181  rv = esp_replay_check_esn (sa0, seq);
182  else
183  rv = esp_replay_check (sa0, seq);
184 
185  if (PREDICT_FALSE (rv))
186  {
188  ESP_DECRYPT_ERROR_REPLAY, 1);
189  o_bi0 = i_bi0;
190  to_next[0] = o_bi0;
191  to_next += 1;
192  goto trace;
193  }
194  }
195 
196  sa0->total_data_size += i_b0->current_length;
197 
198  if (PREDICT_TRUE (sa0->integ_alg != IPSEC_INTEG_ALG_NONE))
199  {
200  u8 sig[64];
201  int icv_size =
203  clib_memset (sig, 0, sizeof (sig));
204  u8 *icv =
205  vlib_buffer_get_current (i_b0) + i_b0->current_length -
206  icv_size;
207  i_b0->current_length -= icv_size;
208 
209  hmac_calc (sa0->integ_alg, sa0->integ_key, sa0->integ_key_len,
210  (u8 *) esp0, i_b0->current_length, sig, sa0->use_esn,
211  sa0->seq_hi);
212 
213  if (PREDICT_FALSE (memcmp (icv, sig, icv_size)))
214  {
216  ESP_DECRYPT_ERROR_INTEG_ERROR,
217  1);
218  o_bi0 = i_bi0;
219  to_next[0] = o_bi0;
220  to_next += 1;
221  goto trace;
222  }
223  }
224 
225  if (PREDICT_TRUE (sa0->use_anti_replay))
226  {
227  if (PREDICT_TRUE (sa0->use_esn))
228  esp_replay_advance_esn (sa0, seq);
229  else
230  esp_replay_advance (sa0, seq);
231  }
232 
233  /* grab free buffer */
234  uword last_empty_buffer = vec_len (empty_buffers) - 1;
235  o_bi0 = empty_buffers[last_empty_buffer];
236  to_next[0] = o_bi0;
237  to_next += 1;
238  o_b0 = vlib_get_buffer (vm, o_bi0);
240  empty_buffers[last_empty_buffer -
241  1], STORE);
242  _vec_len (empty_buffers) = last_empty_buffer;
243 
244  /* add old buffer to the recycle list */
245  vec_add1 (recycle, i_bi0);
246 
247  if ((sa0->crypto_alg >= IPSEC_CRYPTO_ALG_AES_CBC_128 &&
248  sa0->crypto_alg <= IPSEC_CRYPTO_ALG_AES_CBC_256) ||
249  (sa0->crypto_alg >= IPSEC_CRYPTO_ALG_DES_CBC &&
250  sa0->crypto_alg <= IPSEC_CRYPTO_ALG_3DES_CBC))
251  {
252  const int BLOCK_SIZE =
254  const int IV_SIZE =
256  esp_footer_t *f0;
257  u8 ip_hdr_size = 0;
258 
259  int blocks =
260  (i_b0->current_length - sizeof (esp_header_t) -
261  IV_SIZE) / BLOCK_SIZE;
262 
263  o_b0->current_data = sizeof (ethernet_header_t);
264 
265  /* transport mode */
266  if (PREDICT_FALSE (!sa0->is_tunnel && !sa0->is_tunnel_ip6))
267  {
268  tunnel_mode = 0;
269 
270  if (is_ip6)
271  {
272  ih6 =
273  (ip6_header_t *) ((u8 *) esp0 -
274  sizeof (ip6_header_t));
275  ip_hdr_size = sizeof (ip6_header_t);
276  oh6 = vlib_buffer_get_current (o_b0);
277  }
278  else
279  {
280  if (sa0->udp_encap)
281  {
282  ih4 =
283  (ip4_header_t *) ((u8 *) esp0 -
284  sizeof (udp_header_t) -
285  sizeof (ip4_header_t));
286  }
287  else
288  {
289  ih4 =
290  (ip4_header_t *) ((u8 *) esp0 -
291  sizeof (ip4_header_t));
292  }
293  oh4 = vlib_buffer_get_current (o_b0);
294  ip_hdr_size = sizeof (ip4_header_t);
295  }
296  }
297 
299  esp0->data + IV_SIZE,
300  (u8 *) vlib_buffer_get_current (o_b0) +
301  ip_hdr_size, BLOCK_SIZE * blocks,
302  sa0->crypto_key, esp0->data);
303 
304  o_b0->current_length = (blocks * BLOCK_SIZE) - 2 + ip_hdr_size;
305  o_b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
306  f0 =
307  (esp_footer_t *) ((u8 *) vlib_buffer_get_current (o_b0) +
308  o_b0->current_length);
309  o_b0->current_length -= f0->pad_length;
310 
311  /* tunnel mode */
312  if (PREDICT_TRUE (tunnel_mode))
313  {
314  if (PREDICT_TRUE (f0->next_header == IP_PROTOCOL_IP_IN_IP))
315  {
316  next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
317  oh4 = vlib_buffer_get_current (o_b0);
318  }
319  else if (f0->next_header == IP_PROTOCOL_IPV6)
320  next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
321  else
322  {
324  ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
325  1);
326  o_b0 = 0;
327  goto trace;
328  }
329  }
330  /* transport mode */
331  else
332  {
333  if (is_ip6)
334  {
335  next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
336  oh6->ip_version_traffic_class_and_flow_label =
338  oh6->protocol = f0->next_header;
339  oh6->hop_limit = ih6->hop_limit;
340  oh6->src_address.as_u64[0] = ih6->src_address.as_u64[0];
341  oh6->src_address.as_u64[1] = ih6->src_address.as_u64[1];
342  oh6->dst_address.as_u64[0] = ih6->dst_address.as_u64[0];
343  oh6->dst_address.as_u64[1] = ih6->dst_address.as_u64[1];
344  oh6->payload_length =
345  clib_host_to_net_u16 (vlib_buffer_length_in_chain
346  (vm,
347  o_b0) - sizeof (ip6_header_t));
348  }
349  else
350  {
351  next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
352  oh4->ip_version_and_header_length = 0x45;
353  oh4->tos = ih4->tos;
354  oh4->fragment_id = 0;
355  oh4->flags_and_fragment_offset = 0;
356  oh4->ttl = ih4->ttl;
357  oh4->protocol = f0->next_header;
358  oh4->src_address.as_u32 = ih4->src_address.as_u32;
359  oh4->dst_address.as_u32 = ih4->dst_address.as_u32;
360  oh4->length =
361  clib_host_to_net_u16 (vlib_buffer_length_in_chain
362  (vm, o_b0));
363  oh4->checksum = ip4_header_checksum (oh4);
364  }
365  }
366 
367  /* for IPSec-GRE tunnel next node is ipsec-gre-input */
368  if (PREDICT_FALSE
369  ((vnet_buffer (i_b0)->ipsec.flags) &
371  next0 = ESP_DECRYPT_NEXT_IPSEC_GRE_INPUT;
372 
373  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
374  vnet_buffer (o_b0)->sw_if_index[VLIB_RX] =
375  vnet_buffer (i_b0)->sw_if_index[VLIB_RX];
376  }
377 
378  trace:
379  if (PREDICT_FALSE (i_b0->flags & VLIB_BUFFER_IS_TRACED))
380  {
381  if (o_b0)
382  {
383  o_b0->flags |= VLIB_BUFFER_IS_TRACED;
384  o_b0->trace_index = i_b0->trace_index;
385  esp_decrypt_trace_t *tr =
386  vlib_add_trace (vm, node, o_b0, sizeof (*tr));
387  tr->crypto_alg = sa0->crypto_alg;
388  tr->integ_alg = sa0->integ_alg;
389  }
390  }
391 
392  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
393  n_left_to_next, o_bi0, next0);
394  }
395  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
396  }
398  ESP_DECRYPT_ERROR_RX_PKTS,
399  from_frame->n_vectors);
400 
401 
402 free_buffers_and_exit:
403  if (recycle)
404  vlib_buffer_free (vm, recycle, vec_len (recycle));
405  vec_free (recycle);
406  return from_frame->n_vectors;
407 }
408 
410  vlib_node_runtime_t * node,
411  vlib_frame_t * from_frame)
412 {
413  return esp_decrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ );
414 }
415 
416 /* *INDENT-OFF* */
418  .name = "esp4-decrypt",
419  .vector_size = sizeof (u32),
420  .format_trace = format_esp_decrypt_trace,
421  .type = VLIB_NODE_TYPE_INTERNAL,
422 
424  .error_strings = esp_decrypt_error_strings,
425 
426  .n_next_nodes = ESP_DECRYPT_N_NEXT,
427  .next_nodes = {
428 #define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
430 #undef _
431  },
432 };
433 /* *INDENT-ON* */
434 
436  vlib_node_runtime_t * node,
437  vlib_frame_t * from_frame)
438 {
439  return esp_decrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ );
440 }
441 
442 /* *INDENT-OFF* */
444  .name = "esp6-decrypt",
445  .vector_size = sizeof (u32),
446  .format_trace = format_esp_decrypt_trace,
447  .type = VLIB_NODE_TYPE_INTERNAL,
448 
450  .error_strings = esp_decrypt_error_strings,
451 
452  .n_next_nodes = ESP_DECRYPT_N_NEXT,
453  .next_nodes = {
454 #define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
456 #undef _
457  },
458 };
459 /* *INDENT-ON* */
460 
461 /*
462  * fd.io coding-style-patch-verification: ON
463  *
464  * Local Variables:
465  * eval: (c-set-style "gnu")
466  * End:
467  */
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: vlib_api_cli.c:862
static u8 * format_esp_decrypt_trace(u8 *s, va_list *args)
Definition: esp_decrypt.c:71
#define CLIB_UNUSED(x)
Definition: clib.h:82
static char * esp_decrypt_error_strings[]
Definition: esp_decrypt.c:57
static void vlib_buffer_free(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Free buffers Frees the entire buffer chain for each buffer.
Definition: buffer_funcs.h:529
ip4_address_t src_address
Definition: ip4_packet.h:170
ipsec_proto_main_integ_alg_t * ipsec_proto_main_integ_algs
Definition: ipsec.h:343
#define PREDICT_TRUE(x)
Definition: clib.h:112
u64 as_u64[2]
Definition: ip6_packet.h:51
static void esp_replay_advance(ipsec_sa_t *sa, u32 seq)
Definition: esp.h:124
#define NULL
Definition: clib.h:58
ipsec_crypto_alg_t last_decrypt_alg
Definition: ipsec.h:336
static unsigned int hmac_calc(ipsec_integ_alg_t alg, u8 *key, int key_len, u8 *data, int data_len, u8 *signature, u8 use_esn, u32 seq_hi)
Definition: esp.h:280
ipsec_integ_alg_t integ_alg
Definition: ipsec.h:129
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:525
ipsec_crypto_alg_t crypto_alg
Definition: esp_decrypt.c:65
u8 is_tunnel
Definition: ipsec.h:136
clib_memset(h->entries, 0, sizeof(h->entries[0])*entries)
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
const EVP_CIPHER * type
Definition: ipsec.h:304
#define VLIB_NODE_FN(node)
Definition: node.h:201
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:267
ipsec_proto_main_crypto_alg_t * ipsec_proto_main_crypto_algs
Definition: ipsec.h:342
ip6_address_t src_address
Definition: ip6_packet.h:378
esp_decrypt_next_t
Definition: esp_decrypt.c:32
unsigned char u8
Definition: types.h:56
u8 crypto_key[128]
Definition: ipsec.h:127
ipsec_proto_main_t ipsec_proto_main
Definition: esp_encrypt.c:26
u32 seq_hi
Definition: ipsec.h:147
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:110
u8 integ_key[128]
Definition: ipsec.h:131
#define vlib_prefetch_buffer_with_index(vm, bi, type)
Prefetch buffer metadata by buffer index The first 64 bytes of buffer contains most header informatio...
Definition: buffer_funcs.h:341
static void esp_replay_advance_esn(ipsec_sa_t *sa, u32 seq)
Definition: esp.h:145
ipsec_main_t ipsec_main
Definition: ipsec.c:30
#define always_inline
Definition: clib.h:98
ip4_address_t dst_address
Definition: ip4_packet.h:170
u8 use_esn
Definition: ipsec.h:133
static void esp_decrypt_cbc(ipsec_crypto_alg_t alg, u8 *in, u8 *out, size_t in_len, u8 *key, u8 *iv)
Definition: esp_decrypt.c:84
u8 data[0]
Definition: esp.h:25
unsigned int u32
Definition: types.h:88
#define foreach_esp_decrypt_error
Definition: esp_decrypt.c:40
u8 * format_ipsec_crypto_alg(u8 *s, va_list *args)
Definition: ipsec_format.c:58
u8 udp_encap
Definition: ipsec.h:138
ipsec_proto_main_per_thread_data_t * per_thread_data
Definition: ipsec.h:344
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
ipsec_integ_alg_t
Definition: ipsec.h:105
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:114
u8 is_tunnel_ip6
Definition: ipsec.h:137
static int esp_replay_check_esn(ipsec_sa_t *sa, u32 seq)
Definition: esp.h:80
long ctx[MAX_CONNS]
Definition: main.c:144
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:214
#define PREDICT_FALSE(x)
Definition: clib.h:111
u32 node_index
Node index.
Definition: node.h:519
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:368
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1180
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:420
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:212
vlib_main_t * vm
Definition: buffer.c:301
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:341
static void ipsec_alloc_empty_buffers(vlib_main_t *vm, ipsec_main_t *im)
Definition: ipsec.h:469
#define ARRAY_LEN(x)
Definition: clib.h:62
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:459
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:538
#define ASSERT(truth)
static int esp_replay_check(ipsec_sa_t *sa, u32 seq)
Definition: esp.h:62
esp_decrypt_error_t
Definition: esp_decrypt.c:49
ipsec_sa_t * sad
Definition: ipsec.h:353
ipsec_crypto_alg_t
Definition: ipsec.h:88
u64 total_data_size
Definition: ipsec.h:153
u8 integ_key_len
Definition: ipsec.h:130
u32 seq
Definition: esp.h:24
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
u8 * format_ipsec_integ_alg(u8 *s, va_list *args)
Definition: ipsec_format.c:90
u32 ip_version_traffic_class_and_flow_label
Definition: ip6_packet.h:365
Definition: defs.h:47
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
#define vnet_buffer(b)
Definition: buffer.h:368
#define foreach_esp_decrypt_next
Definition: esp_decrypt.c:25
ipsec_crypto_alg_t crypto_alg
Definition: ipsec.h:125
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:117
u32 ** empty_buffers
Definition: ipsec.h:359
u8 use_anti_replay
Definition: ipsec.h:134
static uword esp_decrypt_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame, int is_ip6)
Definition: esp_decrypt.c:116
vlib_node_registration_t esp6_decrypt_node
(constructor) VLIB_REGISTER_NODE (esp6_decrypt_node)
Definition: esp_decrypt.c:443
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:62
u32 trace_index
Specifies index into trace buffer if VLIB_PACKET_IS_TRACED flag is set.
Definition: buffer.h:151
#define IPSEC_FLAG_IPSEC_GRE_TUNNEL
Definition: ipsec.h:28
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:247
ipsec_integ_alg_t integ_alg
Definition: esp_decrypt.c:66
Definition: defs.h:46
vlib_node_registration_t esp4_decrypt_node
(constructor) VLIB_REGISTER_NODE (esp4_decrypt_node)
Definition: esp_decrypt.c:417
ip6_address_t dst_address
Definition: ip6_packet.h:378