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Vector Packet Processing
esp_encrypt.c
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1 /*
2  * esp_encrypt.c : IPSec ESP encrypt 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 
26 #define foreach_esp_encrypt_next \
27 _(DROP, "error-drop") \
28 _(IP4_LOOKUP, "ip4-lookup") \
29 _(IP6_LOOKUP, "ip6-lookup") \
30 _(INTERFACE_OUTPUT, "interface-output")
31 
32 #define _(v, s) ESP_ENCRYPT_NEXT_##v,
33 typedef enum
34 {
36 #undef _
39 
40 #define foreach_esp_encrypt_error \
41  _(RX_PKTS, "ESP pkts received") \
42  _(NO_BUFFER, "No buffer (packet dropped)") \
43  _(DECRYPTION_FAILED, "ESP encryption failed") \
44  _(SEQ_CYCLED, "sequence number cycled")
45 
46 
47 typedef enum
48 {
49 #define _(sym,str) ESP_ENCRYPT_ERROR_##sym,
51 #undef _
54 
55 static char *esp_encrypt_error_strings[] = {
56 #define _(sym,string) string,
58 #undef _
59 };
60 
62 
63 typedef struct
64 {
70 
71 /* packet trace format function */
72 static u8 *
73 format_esp_encrypt_trace (u8 * s, va_list * args)
74 {
75  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
76  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
77  esp_encrypt_trace_t *t = va_arg (*args, esp_encrypt_trace_t *);
78 
79  s = format (s, "esp: spi %u seq %u crypto %U integrity %U",
80  t->spi, t->seq,
83  return s;
84 }
85 
86 always_inline void
88  u8 * in, u8 * out, size_t in_len, u8 * key, u8 * iv)
89 {
90  esp_main_t *em = &esp_main;
91  u32 thread_index = vlib_get_thread_index ();
92  EVP_CIPHER_CTX *ctx = &(em->per_thread_data[thread_index].encrypt_ctx);
93  const EVP_CIPHER *cipher = NULL;
94  int out_len;
95 
96  ASSERT (alg < IPSEC_CRYPTO_N_ALG);
97 
98  if (PREDICT_FALSE (em->esp_crypto_algs[alg].type == IPSEC_CRYPTO_ALG_NONE))
99  return;
100 
101  if (PREDICT_FALSE
102  (alg != em->per_thread_data[thread_index].last_encrypt_alg))
103  {
104  cipher = em->esp_crypto_algs[alg].type;
105  em->per_thread_data[thread_index].last_encrypt_alg = alg;
106  }
107 
108  EVP_EncryptInit_ex (ctx, cipher, NULL, key, iv);
109 
110  EVP_EncryptUpdate (ctx, out, &out_len, in, in_len);
111  EVP_EncryptFinal_ex (ctx, out + out_len, &out_len);
112 }
113 
114 static uword
116  vlib_node_runtime_t * node, vlib_frame_t * from_frame)
117 {
118  u32 n_left_from, *from, *to_next = 0, next_index;
119  from = vlib_frame_vector_args (from_frame);
120  n_left_from = from_frame->n_vectors;
121  ipsec_main_t *im = &ipsec_main;
122  u32 *recycle = 0;
123  u32 thread_index = vlib_get_thread_index ();
124 
125  ipsec_alloc_empty_buffers (vm, im);
126 
127  u32 *empty_buffers = im->empty_buffers[thread_index];
128 
129  if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from))
130  {
132  ESP_ENCRYPT_ERROR_NO_BUFFER, n_left_from);
133  clib_warning ("no enough empty buffers. discarding frame");
134  goto free_buffers_and_exit;
135  }
136 
137  next_index = node->cached_next_index;
138 
139  while (n_left_from > 0)
140  {
141  u32 n_left_to_next;
142 
143  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
144 
145  while (n_left_from > 0 && n_left_to_next > 0)
146  {
147  u32 i_bi0, o_bi0, next0;
148  vlib_buffer_t *i_b0, *o_b0 = 0;
149  u32 sa_index0;
150  ipsec_sa_t *sa0;
151  ip4_and_esp_header_t *ih0, *oh0 = 0;
152  ip6_and_esp_header_t *ih6_0, *oh6_0 = 0;
153  uword last_empty_buffer;
154  esp_header_t *o_esp0;
155  esp_footer_t *f0;
156  u8 is_ipv6;
157  u8 ip_hdr_size;
158  u8 next_hdr_type;
159  u32 ip_proto = 0;
160  u8 transport_mode = 0;
161 
162  i_bi0 = from[0];
163  from += 1;
164  n_left_from -= 1;
165  n_left_to_next -= 1;
166 
167  next0 = ESP_ENCRYPT_NEXT_DROP;
168 
169  i_b0 = vlib_get_buffer (vm, i_bi0);
170  sa_index0 = vnet_buffer (i_b0)->ipsec.sad_index;
171  sa0 = pool_elt_at_index (im->sad, sa_index0);
172 
173  if (PREDICT_FALSE (esp_seq_advance (sa0)))
174  {
175  clib_warning ("sequence number counter has cycled SPI %u",
176  sa0->spi);
178  ESP_ENCRYPT_ERROR_SEQ_CYCLED, 1);
179  //TODO: rekey SA
180  o_bi0 = i_bi0;
181  to_next[0] = o_bi0;
182  to_next += 1;
183  goto trace;
184  }
185 
186  sa0->total_data_size += i_b0->current_length;
187 
188  /* grab free buffer */
189  last_empty_buffer = vec_len (empty_buffers) - 1;
190  o_bi0 = empty_buffers[last_empty_buffer];
191  o_b0 = vlib_get_buffer (vm, o_bi0);
193  o_b0->current_data = sizeof (ethernet_header_t);
194  ih0 = vlib_buffer_get_current (i_b0);
196  empty_buffers[last_empty_buffer -
197  1], STORE);
198  _vec_len (empty_buffers) = last_empty_buffer;
199  to_next[0] = o_bi0;
200  to_next += 1;
201 
202  /* add old buffer to the recycle list */
203  vec_add1 (recycle, i_bi0);
204 
205  /* is ipv6 */
206  if (PREDICT_FALSE
207  ((ih0->ip4.ip_version_and_header_length & 0xF0) == 0x60))
208  {
209  is_ipv6 = 1;
210  ih6_0 = vlib_buffer_get_current (i_b0);
211  ip_hdr_size = sizeof (ip6_header_t);
212  next_hdr_type = IP_PROTOCOL_IPV6;
213  oh6_0 = vlib_buffer_get_current (o_b0);
214  o_esp0 = vlib_buffer_get_current (o_b0) + sizeof (ip6_header_t);
215 
216  oh6_0->ip6.ip_version_traffic_class_and_flow_label =
217  ih6_0->ip6.ip_version_traffic_class_and_flow_label;
218  oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_ESP;
219  oh6_0->ip6.hop_limit = 254;
220  oh6_0->ip6.src_address.as_u64[0] =
221  ih6_0->ip6.src_address.as_u64[0];
222  oh6_0->ip6.src_address.as_u64[1] =
223  ih6_0->ip6.src_address.as_u64[1];
224  oh6_0->ip6.dst_address.as_u64[0] =
225  ih6_0->ip6.dst_address.as_u64[0];
226  oh6_0->ip6.dst_address.as_u64[1] =
227  ih6_0->ip6.dst_address.as_u64[1];
228  oh6_0->esp.spi = clib_net_to_host_u32 (sa0->spi);
229  oh6_0->esp.seq = clib_net_to_host_u32 (sa0->seq);
230  ip_proto = ih6_0->ip6.protocol;
231 
232  next0 = ESP_ENCRYPT_NEXT_IP6_LOOKUP;
233  }
234  else
235  {
236  is_ipv6 = 0;
237  ip_hdr_size = sizeof (ip4_header_t);
238  next_hdr_type = IP_PROTOCOL_IP_IN_IP;
239  oh0 = vlib_buffer_get_current (o_b0);
240  o_esp0 = vlib_buffer_get_current (o_b0) + sizeof (ip4_header_t);
241 
242  oh0->ip4.ip_version_and_header_length = 0x45;
243  oh0->ip4.tos = ih0->ip4.tos;
244  oh0->ip4.fragment_id = 0;
245  oh0->ip4.flags_and_fragment_offset = 0;
246  oh0->ip4.ttl = 254;
247  oh0->ip4.protocol = IP_PROTOCOL_IPSEC_ESP;
248  oh0->ip4.src_address.as_u32 = ih0->ip4.src_address.as_u32;
249  oh0->ip4.dst_address.as_u32 = ih0->ip4.dst_address.as_u32;
250  oh0->esp.spi = clib_net_to_host_u32 (sa0->spi);
251  oh0->esp.seq = clib_net_to_host_u32 (sa0->seq);
252  ip_proto = ih0->ip4.protocol;
253 
254  next0 = ESP_ENCRYPT_NEXT_IP4_LOOKUP;
255  }
256 
257  if (PREDICT_TRUE
258  (!is_ipv6 && sa0->is_tunnel && !sa0->is_tunnel_ip6))
259  {
260  oh0->ip4.src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32;
261  oh0->ip4.dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32;
262 
263  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
264  }
265  else if (is_ipv6 && sa0->is_tunnel && sa0->is_tunnel_ip6)
266  {
267  oh6_0->ip6.src_address.as_u64[0] =
268  sa0->tunnel_src_addr.ip6.as_u64[0];
269  oh6_0->ip6.src_address.as_u64[1] =
270  sa0->tunnel_src_addr.ip6.as_u64[1];
271  oh6_0->ip6.dst_address.as_u64[0] =
272  sa0->tunnel_dst_addr.ip6.as_u64[0];
273  oh6_0->ip6.dst_address.as_u64[1] =
274  sa0->tunnel_dst_addr.ip6.as_u64[1];
275 
276  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
277  }
278  else
279  {
280  next_hdr_type = ip_proto;
281  if (vnet_buffer (i_b0)->sw_if_index[VLIB_TX] != ~0)
282  {
283  transport_mode = 1;
284  ethernet_header_t *ieh0, *oeh0;
285  ieh0 =
286  (ethernet_header_t *) ((u8 *)
287  vlib_buffer_get_current (i_b0) -
288  sizeof (ethernet_header_t));
289  oeh0 = (ethernet_header_t *) o_b0->data;
290  clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
291  next0 = ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT;
292  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] =
293  vnet_buffer (i_b0)->sw_if_index[VLIB_TX];
294  }
295  vlib_buffer_advance (i_b0, ip_hdr_size);
296  }
297 
299 
300  if (PREDICT_TRUE (sa0->crypto_alg != IPSEC_CRYPTO_ALG_NONE))
301  {
302 
303  const int BLOCK_SIZE = 16;
304  const int IV_SIZE = 16;
305  int blocks = 1 + (i_b0->current_length + 1) / BLOCK_SIZE;
306 
307  /* pad packet in input buffer */
308  u8 pad_bytes = BLOCK_SIZE * blocks - 2 - i_b0->current_length;
309  u8 i;
310  u8 *padding =
312  i_b0->current_length = BLOCK_SIZE * blocks;
313  for (i = 0; i < pad_bytes; ++i)
314  {
315  padding[i] = i + 1;
316  }
317  f0 = vlib_buffer_get_current (i_b0) + i_b0->current_length - 2;
318  f0->pad_length = pad_bytes;
319  f0->next_header = next_hdr_type;
320 
321  o_b0->current_length = ip_hdr_size + sizeof (esp_header_t) +
322  BLOCK_SIZE * blocks + IV_SIZE;
323 
324  vnet_buffer (o_b0)->sw_if_index[VLIB_RX] =
325  vnet_buffer (i_b0)->sw_if_index[VLIB_RX];
326 
327  u8 iv[16];
328  RAND_bytes (iv, sizeof (iv));
329 
331  ip_hdr_size + sizeof (esp_header_t), iv, 16);
332 
334  (u8 *) vlib_buffer_get_current (i_b0),
335  (u8 *) vlib_buffer_get_current (o_b0) +
336  ip_hdr_size + sizeof (esp_header_t) +
337  IV_SIZE, BLOCK_SIZE * blocks,
338  sa0->crypto_key, iv);
339  }
340 
341  o_b0->current_length += hmac_calc (sa0->integ_alg, sa0->integ_key,
342  sa0->integ_key_len,
343  (u8 *) o_esp0,
344  o_b0->current_length -
345  ip_hdr_size,
346  vlib_buffer_get_current (o_b0) +
347  o_b0->current_length,
348  sa0->use_esn, sa0->seq_hi);
349 
350 
351  if (PREDICT_FALSE (is_ipv6))
352  {
353  oh6_0->ip6.payload_length =
354  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, o_b0) -
355  sizeof (ip6_header_t));
356  }
357  else
358  {
359  oh0->ip4.length =
360  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, o_b0));
361  oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4);
362  }
363 
364  if (transport_mode)
365  vlib_buffer_reset (o_b0);
366 
367  trace:
369  {
370  if (o_b0)
371  {
372  o_b0->flags |= VLIB_BUFFER_IS_TRACED;
373  o_b0->trace_index = i_b0->trace_index;
374  esp_encrypt_trace_t *tr =
375  vlib_add_trace (vm, node, o_b0, sizeof (*tr));
376  tr->spi = sa0->spi;
377  tr->seq = sa0->seq - 1;
378  tr->crypto_alg = sa0->crypto_alg;
379  tr->integ_alg = sa0->integ_alg;
380  }
381  }
382 
383  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
384  to_next, n_left_to_next, o_bi0,
385  next0);
386  }
387  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
388  }
390  ESP_ENCRYPT_ERROR_RX_PKTS,
391  from_frame->n_vectors);
392 
393 free_buffers_and_exit:
394  if (recycle)
395  vlib_buffer_free (vm, recycle, vec_len (recycle));
396  vec_free (recycle);
397  return from_frame->n_vectors;
398 }
399 
400 
401 /* *INDENT-OFF* */
403  .function = esp_encrypt_node_fn,
404  .name = "esp-encrypt",
405  .vector_size = sizeof (u32),
406  .format_trace = format_esp_encrypt_trace,
407  .type = VLIB_NODE_TYPE_INTERNAL,
408 
410  .error_strings = esp_encrypt_error_strings,
411 
412  .n_next_nodes = ESP_ENCRYPT_N_NEXT,
413  .next_nodes = {
414 #define _(s,n) [ESP_ENCRYPT_NEXT_##s] = n,
416 #undef _
417  },
418 };
419 /* *INDENT-ON* */
420 
422 /*
423  * fd.io coding-style-patch-verification: ON
424  *
425  * Local Variables:
426  * eval: (c-set-style "gnu")
427  * End:
428  */
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:337
#define CLIB_UNUSED(x)
Definition: clib.h:79
ip46_address_t tunnel_src_addr
Definition: ipsec.h:119
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:279
static void vlib_buffer_reset(vlib_buffer_t *b)
Reset current header & length to state they were in when packet was received.
Definition: buffer.h:232
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:317
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: memory_vlib.c:1296
#define PREDICT_TRUE(x)
Definition: clib.h:98
static uword esp_encrypt_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: esp_encrypt.c:115
#define NULL
Definition: clib.h:55
ipsec_integ_alg_t integ_alg
Definition: ipsec.h:110
const EVP_CIPHER * type
Definition: esp.h:51
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:518
u32 padding
Definition: vhost-user.h:77
u8 is_tunnel
Definition: ipsec.h:117
struct _vlib_node_registration vlib_node_registration_t
static u8 * format_esp_encrypt_trace(u8 *s, va_list *args)
Definition: esp_encrypt.c:73
ipsec_integ_alg_t integ_alg
Definition: esp_encrypt.c:68
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
ipsec_crypto_alg_t crypto_alg
Definition: esp_encrypt.c:67
esp_main_t esp_main
Definition: esp.h:80
esp_crypto_alg_t * esp_crypto_algs
Definition: esp.h:75
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:107
u8 crypto_key[128]
Definition: ipsec.h:108
u32 spi
Definition: ipsec.h:103
u32 seq_hi
Definition: ipsec.h:126
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:68
u8 integ_key[128]
Definition: ipsec.h:112
#define foreach_esp_encrypt_next
Definition: esp_encrypt.c:26
#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:180
#define always_inline
Definition: clib.h:84
ipsec_main_t ipsec_main
Definition: ipsec.h:282
vlib_node_registration_t esp_encrypt_node
(constructor) VLIB_REGISTER_NODE (esp_encrypt_node)
Definition: esp_encrypt.c:61
u8 use_esn
Definition: ipsec.h:114
#define VLIB_BUFFER_TOTAL_LENGTH_VALID
Definition: buffer.h:97
u8 * format_ipsec_crypto_alg(u8 *s, va_list *args)
Definition: ipsec_format.c:58
esp_encrypt_error_t
Definition: esp_encrypt.c:47
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:458
ipsec_integ_alg_t
Definition: ipsec.h:86
EVP_CIPHER_CTX encrypt_ctx
Definition: esp.h:63
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:72
u8 is_tunnel_ip6
Definition: ipsec.h:118
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:193
#define PREDICT_FALSE(x)
Definition: clib.h:97
#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:216
#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:364
static char * esp_encrypt_error_strings[]
Definition: esp_encrypt.c:55
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1158
ip46_address_t tunnel_dst_addr
Definition: ipsec.h:120
u16 n_vectors
Definition: node.h:344
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:221
vlib_main_t * vm
Definition: buffer.c:283
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:336
#define clib_warning(format, args...)
Definition: error.h:59
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:93
#define clib_memcpy(a, b, c)
Definition: string.h:69
static void ipsec_alloc_empty_buffers(vlib_main_t *vm, ipsec_main_t *im)
Definition: ipsec.h:327
#define ARRAY_LEN(x)
Definition: clib.h:59
esp_encrypt_next_t
Definition: esp_encrypt.c:33
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:454
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:456
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
long ctx[MAX_CONNS]
Definition: main.c:95
ipsec_sa_t * sad
Definition: ipsec.h:247
static void esp_encrypt_aes_cbc(ipsec_crypto_alg_t alg, u8 *in, u8 *out, size_t in_len, u8 *key, u8 *iv)
Definition: esp_encrypt.c:87
ipsec_crypto_alg_t
Definition: ipsec.h:68
u64 total_data_size
Definition: ipsec.h:132
u8 integ_key_len
Definition: ipsec.h:111
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:206
u32 seq
Definition: ipsec.h:125
u64 uword
Definition: types.h:112
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:55
u8 * format_ipsec_integ_alg(u8 *s, va_list *args)
Definition: ipsec_format.c:90
Definition: defs.h:47
ipsec_crypto_alg_t last_encrypt_alg
Definition: esp.h:68
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
#define vnet_buffer(b)
Definition: buffer.h:306
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:158
ipsec_crypto_alg_t crypto_alg
Definition: ipsec.h:106
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:157
Definition: esp.h:73
static int esp_seq_advance(ipsec_sa_t *sa)
Definition: esp.h:207
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:75
u32 ** empty_buffers
Definition: ipsec.h:253
#define foreach_esp_encrypt_error
Definition: esp_encrypt.c:40
esp_main_per_thread_data_t * per_thread_data
Definition: esp.h:77
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
u32 trace_index
Specifies index into trace buffer if VLIB_PACKET_IS_TRACED flag is set.
Definition: buffer.h:136
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:239
Definition: defs.h:46