FD.io VPP  v16.09
Vector Packet Processing
esp_encrypt.c
Go to the documentation of this file.
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 #define ESP_SEQ_MAX (4294967295UL)
26 
27 #define foreach_esp_encrypt_next \
28 _(DROP, "error-drop") \
29 _(IP4_INPUT, "ip4-input") \
30 _(IP6_INPUT, "ip6-input") \
31 _(INTERFACE_OUTPUT, "interface-output")
32 
33 #define _(v, s) ESP_ENCRYPT_NEXT_##v,
34 typedef enum
35 {
37 #undef _
40 
41 #define foreach_esp_encrypt_error \
42  _(RX_PKTS, "ESP pkts received") \
43  _(NO_BUFFER, "No buffer (packet dropped)") \
44  _(DECRYPTION_FAILED, "ESP encryption failed") \
45  _(SEQ_CYCLED, "sequence number cycled")
46 
47 
48 typedef enum
49 {
50 #define _(sym,str) ESP_ENCRYPT_ERROR_##sym,
52 #undef _
55 
56 static char *esp_encrypt_error_strings[] = {
57 #define _(sym,string) string,
59 #undef _
60 };
61 
63 
64 typedef struct
65 {
71 
72 /* packet trace format function */
73 static u8 *
74 format_esp_encrypt_trace (u8 * s, va_list * args)
75 {
76  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
77  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
78  esp_encrypt_trace_t *t = va_arg (*args, esp_encrypt_trace_t *);
79 
80  s = format (s, "esp: spi %u seq %u crypto %U integrity %U",
81  t->spi, t->seq,
84  return s;
85 }
86 
87 always_inline void
89  u8 * in, u8 * out, size_t in_len, u8 * key, u8 * iv)
90 {
91  esp_main_t *em = &esp_main;
92  u32 cpu_index = os_get_cpu_number ();
93  EVP_CIPHER_CTX *ctx = &(em->per_thread_data[cpu_index].encrypt_ctx);
94  const EVP_CIPHER *cipher = NULL;
95  int out_len;
96 
97  ASSERT (alg < IPSEC_CRYPTO_N_ALG);
98 
99  if (PREDICT_FALSE (em->esp_crypto_algs[alg].type == IPSEC_CRYPTO_ALG_NONE))
100  return;
101 
102  if (PREDICT_FALSE (alg != em->per_thread_data[cpu_index].last_encrypt_alg))
103  {
104  cipher = em->esp_crypto_algs[alg].type;
105  em->per_thread_data[cpu_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 always_inline int
116 {
117  if (PREDICT_TRUE (sa->use_esn))
118  {
119  if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX))
120  {
121  if (PREDICT_FALSE
122  (sa->use_anti_replay && sa->seq_hi == ESP_SEQ_MAX))
123  return 1;
124  sa->seq_hi++;
125  }
126  sa->seq++;
127  }
128  else
129  {
130  if (PREDICT_FALSE (sa->use_anti_replay && sa->seq == ESP_SEQ_MAX))
131  return 1;
132  sa->seq++;
133  }
134 
135  return 0;
136 }
137 
138 static uword
140  vlib_node_runtime_t * node, vlib_frame_t * from_frame)
141 {
142  u32 n_left_from, *from, *to_next = 0, next_index;
143  from = vlib_frame_vector_args (from_frame);
144  n_left_from = from_frame->n_vectors;
145  ipsec_main_t *im = &ipsec_main;
146  u32 *recycle = 0;
147  u32 cpu_index = os_get_cpu_number ();
148 
149  ipsec_alloc_empty_buffers (vm, im);
150 
151  u32 *empty_buffers = im->empty_buffers[cpu_index];
152 
153  if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from))
154  {
156  ESP_ENCRYPT_ERROR_NO_BUFFER, n_left_from);
157  clib_warning ("no enough empty buffers. discarding frame");
158  goto free_buffers_and_exit;
159  }
160 
161  next_index = node->cached_next_index;
162 
163  while (n_left_from > 0)
164  {
165  u32 n_left_to_next;
166 
167  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
168 
169  while (n_left_from > 0 && n_left_to_next > 0)
170  {
171  u32 i_bi0, o_bi0, next0;
172  vlib_buffer_t *i_b0, *o_b0 = 0;
173  u32 sa_index0;
174  ipsec_sa_t *sa0;
175  ip4_and_esp_header_t *ih0, *oh0 = 0;
176  ip6_and_esp_header_t *ih6_0, *oh6_0 = 0;
177  uword last_empty_buffer;
178  esp_header_t *o_esp0;
179  esp_footer_t *f0;
180  u8 is_ipv6;
181  u8 ip_hdr_size;
182  u8 next_hdr_type;
183  u32 ip_proto = 0;
184  u8 transport_mode = 0;
185 
186  i_bi0 = from[0];
187  from += 1;
188  n_left_from -= 1;
189  n_left_to_next -= 1;
190 
191  next0 = ESP_ENCRYPT_NEXT_DROP;
192 
193  i_b0 = vlib_get_buffer (vm, i_bi0);
194  sa_index0 = vnet_buffer (i_b0)->output_features.ipsec_sad_index;
195  sa0 = pool_elt_at_index (im->sad, sa_index0);
196 
197  if (PREDICT_FALSE (esp_seq_advance (sa0)))
198  {
199  clib_warning ("sequence number counter has cycled SPI %u",
200  sa0->spi);
202  ESP_ENCRYPT_ERROR_SEQ_CYCLED, 1);
203  //TODO: rekey SA
204  o_bi0 = i_bi0;
205  goto trace;
206  }
207 
208  /* grab free buffer */
209  last_empty_buffer = vec_len (empty_buffers) - 1;
210  o_bi0 = empty_buffers[last_empty_buffer];
211  o_b0 = vlib_get_buffer (vm, o_bi0);
213  o_b0->current_data = sizeof (ethernet_header_t);
214  ih0 = vlib_buffer_get_current (i_b0);
216  empty_buffers[last_empty_buffer -
217  1], STORE);
218  _vec_len (empty_buffers) = last_empty_buffer;
219  to_next[0] = o_bi0;
220  to_next += 1;
221 
222  /* add old buffer to the recycle list */
223  vec_add1 (recycle, i_bi0);
224 
225  /* is ipv6 */
226  if (PREDICT_FALSE
227  ((ih0->ip4.ip_version_and_header_length & 0xF0) == 0x60))
228  {
229  is_ipv6 = 1;
230  ih6_0 = vlib_buffer_get_current (i_b0);
231  ip_hdr_size = sizeof (ip6_header_t);
232  next_hdr_type = IP_PROTOCOL_IPV6;
233  oh6_0 = vlib_buffer_get_current (o_b0);
234  o_esp0 = vlib_buffer_get_current (o_b0) + sizeof (ip6_header_t);
235 
236  oh6_0->ip6.ip_version_traffic_class_and_flow_label =
237  ih6_0->ip6.ip_version_traffic_class_and_flow_label;
238  oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_ESP;
239  oh6_0->ip6.hop_limit = 254;
240  oh6_0->ip6.src_address.as_u64[0] =
241  ih6_0->ip6.src_address.as_u64[0];
242  oh6_0->ip6.src_address.as_u64[1] =
243  ih6_0->ip6.src_address.as_u64[1];
244  oh6_0->ip6.dst_address.as_u64[0] =
245  ih6_0->ip6.dst_address.as_u64[0];
246  oh6_0->ip6.dst_address.as_u64[1] =
247  ih6_0->ip6.dst_address.as_u64[1];
248  oh6_0->esp.spi = clib_net_to_host_u32 (sa0->spi);
249  oh6_0->esp.seq = clib_net_to_host_u32 (sa0->seq);
250  ip_proto = ih6_0->ip6.protocol;
251 
252  next0 = ESP_ENCRYPT_NEXT_IP6_INPUT;
253  }
254  else
255  {
256  is_ipv6 = 0;
257  ip_hdr_size = sizeof (ip4_header_t);
258  next_hdr_type = IP_PROTOCOL_IP_IN_IP;
259  oh0 = vlib_buffer_get_current (o_b0);
260  o_esp0 = vlib_buffer_get_current (o_b0) + sizeof (ip4_header_t);
261 
262  oh0->ip4.ip_version_and_header_length = 0x45;
263  oh0->ip4.tos = ih0->ip4.tos;
264  oh0->ip4.fragment_id = 0;
265  oh0->ip4.flags_and_fragment_offset = 0;
266  oh0->ip4.ttl = 254;
267  oh0->ip4.protocol = IP_PROTOCOL_IPSEC_ESP;
268  oh0->ip4.src_address.as_u32 = ih0->ip4.src_address.as_u32;
269  oh0->ip4.dst_address.as_u32 = ih0->ip4.dst_address.as_u32;
270  oh0->esp.spi = clib_net_to_host_u32 (sa0->spi);
271  oh0->esp.seq = clib_net_to_host_u32 (sa0->seq);
272  ip_proto = ih0->ip4.protocol;
273 
274  next0 = ESP_ENCRYPT_NEXT_IP4_INPUT;
275  }
276 
277  if (PREDICT_TRUE
278  (!is_ipv6 && sa0->is_tunnel && !sa0->is_tunnel_ip6))
279  {
280  oh0->ip4.src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32;
281  oh0->ip4.dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32;
282 
283  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
284  }
285  else if (is_ipv6 && sa0->is_tunnel && sa0->is_tunnel_ip6)
286  {
287  oh6_0->ip6.src_address.as_u64[0] =
288  sa0->tunnel_src_addr.ip6.as_u64[0];
289  oh6_0->ip6.src_address.as_u64[1] =
290  sa0->tunnel_src_addr.ip6.as_u64[1];
291  oh6_0->ip6.dst_address.as_u64[0] =
292  sa0->tunnel_dst_addr.ip6.as_u64[0];
293  oh6_0->ip6.dst_address.as_u64[1] =
294  sa0->tunnel_dst_addr.ip6.as_u64[1];
295 
296  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
297  }
298  else
299  {
300  vlib_buffer_advance (i_b0, ip_hdr_size);
301  next_hdr_type = ip_proto;
302  if (vnet_buffer (i_b0)->sw_if_index[VLIB_TX] != ~0)
303  {
304  transport_mode = 1;
305  ethernet_header_t *ieh0, *oeh0;
306  ieh0 = (ethernet_header_t *) i_b0->data;
307  oeh0 = (ethernet_header_t *) o_b0->data;
308  clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
309  next0 = ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT;
311  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] =
312  vnet_buffer (i_b0)->sw_if_index[VLIB_TX];
313  vnet_buffer (o_b0)->output_features.bitmap =
314  vnet_buffer (i_b0)->output_features.bitmap;
315  }
316  }
317 
319 
320  if (PREDICT_TRUE (sa0->crypto_alg != IPSEC_CRYPTO_ALG_NONE))
321  {
322 
323  const int BLOCK_SIZE = 16;
324  const int IV_SIZE = 16;
325  int blocks = 1 + (i_b0->current_length + 1) / BLOCK_SIZE;
326 
327  /* pad packet in input buffer */
328  u8 pad_bytes = BLOCK_SIZE * blocks - 2 - i_b0->current_length;
329  u8 i;
330  u8 *padding =
332  i_b0->current_length = BLOCK_SIZE * blocks;
333  for (i = 0; i < pad_bytes; ++i)
334  {
335  padding[i] = i + 1;
336  }
337  f0 = vlib_buffer_get_current (i_b0) + i_b0->current_length - 2;
338  f0->pad_length = pad_bytes;
339  f0->next_header = next_hdr_type;
340 
341  o_b0->current_length = ip_hdr_size + sizeof (esp_header_t) +
342  BLOCK_SIZE * blocks + IV_SIZE;
343 
344  vnet_buffer (o_b0)->sw_if_index[VLIB_RX] =
345  vnet_buffer (i_b0)->sw_if_index[VLIB_RX];
346 
347  u8 iv[16];
348  RAND_bytes (iv, sizeof (iv));
349 
351  ip_hdr_size + sizeof (esp_header_t), iv, 16);
352 
354  (u8 *) vlib_buffer_get_current (i_b0),
355  (u8 *) vlib_buffer_get_current (o_b0) +
356  ip_hdr_size + sizeof (esp_header_t) +
357  IV_SIZE, BLOCK_SIZE * blocks,
358  sa0->crypto_key, iv);
359  }
360 
361  o_b0->current_length += hmac_calc (sa0->integ_alg, sa0->integ_key,
362  sa0->integ_key_len,
363  (u8 *) o_esp0,
364  o_b0->current_length -
365  ip_hdr_size,
366  vlib_buffer_get_current (o_b0) +
367  o_b0->current_length,
368  sa0->use_esn, sa0->seq_hi);
369 
370 
371  if (PREDICT_FALSE (is_ipv6))
372  {
373  oh6_0->ip6.payload_length =
374  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, o_b0) -
375  sizeof (ip6_header_t));
376  }
377  else
378  {
379  oh0->ip4.length =
380  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, o_b0));
381  oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4);
382  }
383 
384  if (transport_mode)
385  vlib_buffer_reset (o_b0);
386 
387  trace:
389  {
390  if (o_b0)
391  {
392  o_b0->flags |= VLIB_BUFFER_IS_TRACED;
393  o_b0->trace_index = i_b0->trace_index;
394  esp_encrypt_trace_t *tr =
395  vlib_add_trace (vm, node, o_b0, sizeof (*tr));
396  tr->spi = sa0->spi;
397  tr->seq = sa0->seq - 1;
398  tr->crypto_alg = sa0->crypto_alg;
399  tr->integ_alg = sa0->integ_alg;
400  }
401  }
402 
403  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
404  to_next, n_left_to_next, o_bi0,
405  next0);
406  }
407  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
408  }
410  ESP_ENCRYPT_ERROR_RX_PKTS,
411  from_frame->n_vectors);
412 
413 free_buffers_and_exit:
414  if (recycle)
415  vlib_buffer_free (vm, recycle, vec_len (recycle));
416  vec_free (recycle);
417  return from_frame->n_vectors;
418 }
419 
420 
421 /* *INDENT-OFF* */
423  .function = esp_encrypt_node_fn,
424  .name = "esp-encrypt",
425  .vector_size = sizeof (u32),
426  .format_trace = format_esp_encrypt_trace,
428 
430  .error_strings = esp_encrypt_error_strings,
431 
432  .n_next_nodes = ESP_ENCRYPT_N_NEXT,
433  .next_nodes = {
434 #define _(s,n) [ESP_ENCRYPT_NEXT_##s] = n,
436 #undef _
437  },
438 };
439 /* *INDENT-ON* */
440 
442 /*
443  * fd.io coding-style-patch-verification: ON
444  *
445  * Local Variables:
446  * eval: (c-set-style "gnu")
447  * End:
448  */
#define foreach_esp_encrypt_next
Definition: esp_encrypt.c:27
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:457
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:343
#define CLIB_UNUSED(x)
Definition: clib.h:79
ip46_address_t tunnel_src_addr
Definition: ipsec.h:91
vlib_node_registration_t esp_encrypt_node
(constructor) VLIB_REGISTER_NODE (esp_encrypt_node)
Definition: esp_encrypt.c:62
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: memory_vlib.c:1168
bad routing header type(not 4)") sr_error (NO_MORE_SEGMENTS
#define PREDICT_TRUE(x)
Definition: clib.h:98
#define NULL
Definition: clib.h:55
esp_encrypt_next_t
Definition: esp_encrypt.c:34
static uword esp_encrypt_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: esp_encrypt.c:139
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:132
ipsec_integ_alg_t integ_alg
Definition: ipsec.h:82
const EVP_CIPHER * type
Definition: esp.h:52
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:482
ipsec_main_t ipsec_main
Definition: ipsec.h:238
u8 is_tunnel
Definition: ipsec.h:89
struct _vlib_node_registration vlib_node_registration_t
ipsec_integ_alg_t integ_alg
Definition: esp_encrypt.c:69
ipsec_crypto_alg_t crypto_alg
Definition: esp_encrypt.c:68
static void ipsec_alloc_empty_buffers(vlib_main_t *vm, ipsec_main_t *im)
Definition: ipsec.h:281
esp_crypto_alg_t * esp_crypto_algs
Definition: esp.h:76
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:112
esp_main_t esp_main
Definition: esp.h:81
u8 crypto_key[128]
Definition: ipsec.h:80
u32 spi
Definition: ipsec.h:75
u32 seq_hi
Definition: ipsec.h:96
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:78
u8 integ_key[128]
Definition: ipsec.h:84
#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:182
#define always_inline
Definition: clib.h:84
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:187
#define ESP_SEQ_MAX
Definition: esp_encrypt.c:25
u8 use_esn
Definition: ipsec.h:86
#define clib_warning(format, args...)
Definition: error.h:59
u8 * format_ipsec_integ_alg(u8 *s, va_list *args)
Definition: ipsec_format.c:90
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:88
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:369
EVP_CIPHER_CTX encrypt_ctx
Definition: esp.h:64
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:82
u8 is_tunnel_ip6
Definition: ipsec.h:90
uword os_get_cpu_number(void)
Definition: unix-misc.c:224
#define PREDICT_FALSE(x)
Definition: clib.h:97
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:214
#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:130
#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:348
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1111
ip46_address_t tunnel_dst_addr
Definition: ipsec.h:92
u16 n_vectors
Definition: node.h:344
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:300
static u8 * format_esp_encrypt_trace(u8 *s, va_list *args)
Definition: esp_encrypt.c:74
#define BUFFER_OUTPUT_FEAT_DONE
Definition: buffer.h:65
#define clib_memcpy(a, b, c)
Definition: string.h:63
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:200
#define VLIB_BUFFER_TOTAL_LENGTH_VALID
Definition: buffer.h:97
#define ARRAY_LEN(x)
Definition: clib.h:59
esp_encrypt_error_t
Definition: esp_encrypt.c:48
u16 cached_next_index
Definition: node.h:462
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
#define vnet_buffer(b)
Definition: buffer.h:335
static char * esp_encrypt_error_strings[]
Definition: esp_encrypt.c:56
ipsec_sa_t * sad
Definition: ipsec.h:208
u8 * format(u8 *s, char *fmt,...)
Definition: format.c:418
void vlib_buffer_free(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Free buffers Frees the entire buffer chain for each buffer.
Definition: dpdk_buffer.c:766
ipsec_crypto_alg_t
Definition: ipsec.h:41
u8 integ_key_len
Definition: ipsec.h:83
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:93
u32 seq
Definition: ipsec.h:95
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
#define foreach_esp_encrypt_error
Definition: esp_encrypt.c:41
Definition: defs.h:47
ipsec_crypto_alg_t last_encrypt_alg
Definition: esp.h:69
static int esp_seq_advance(ipsec_sa_t *sa)
Definition: esp_encrypt.c:115
#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:251
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:158
ipsec_crypto_alg_t crypto_alg
Definition: ipsec.h:78
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:151
Definition: esp.h:74
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:85
u32 ** empty_buffers
Definition: ipsec.h:214
u8 * format_ipsec_crypto_alg(u8 *s, va_list *args)
Definition: ipsec_format.c:58
u8 use_anti_replay
Definition: ipsec.h:87
esp_main_per_thread_data_t * per_thread_data
Definition: esp.h:78
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:69
u32 trace_index
Specifies index into trace buffer if VLIB_PACKET_IS_TRACED flag is set.
Definition: buffer.h:135
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:194
Definition: defs.h:46
ipsec_integ_alg_t
Definition: ipsec.h:58