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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 
26 
27 #define foreach_esp_encrypt_next \
28 _(DROP, "error-drop") \
29 _(IP4_LOOKUP, "ip4-lookup") \
30 _(IP6_LOOKUP, "ip6-lookup") \
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 {
92  u32 thread_index = vlib_get_thread_index ();
93 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
94  EVP_CIPHER_CTX *ctx = em->per_thread_data[thread_index].encrypt_ctx;
95 #else
96  EVP_CIPHER_CTX *ctx = &(em->per_thread_data[thread_index].encrypt_ctx);
97 #endif
98  const EVP_CIPHER *cipher = NULL;
99  int out_len;
100 
101  ASSERT (alg < IPSEC_CRYPTO_N_ALG);
102 
103  if (PREDICT_FALSE
104  (em->ipsec_proto_main_crypto_algs[alg].type == IPSEC_CRYPTO_ALG_NONE))
105  return;
106 
107  if (PREDICT_FALSE
108  (alg != em->per_thread_data[thread_index].last_encrypt_alg))
109  {
110  cipher = em->ipsec_proto_main_crypto_algs[alg].type;
111  em->per_thread_data[thread_index].last_encrypt_alg = alg;
112  }
113 
114  EVP_EncryptInit_ex (ctx, cipher, NULL, key, iv);
115 
116  EVP_EncryptUpdate (ctx, out, &out_len, in, in_len);
117  EVP_EncryptFinal_ex (ctx, out + out_len, &out_len);
118 }
119 
120 static uword
122  vlib_node_runtime_t * node, vlib_frame_t * from_frame)
123 {
124  u32 n_left_from, *from, *to_next = 0, next_index;
125  from = vlib_frame_vector_args (from_frame);
126  n_left_from = from_frame->n_vectors;
127  ipsec_main_t *im = &ipsec_main;
129  u32 *recycle = 0;
130  u32 thread_index = vlib_get_thread_index ();
131 
132  ipsec_alloc_empty_buffers (vm, im);
133 
134  u32 *empty_buffers = im->empty_buffers[thread_index];
135 
136  if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from))
137  {
139  ESP_ENCRYPT_ERROR_NO_BUFFER, n_left_from);
140  clib_warning ("no enough empty buffers. discarding frame");
141  goto free_buffers_and_exit;
142  }
143 
144  next_index = node->cached_next_index;
145 
146  while (n_left_from > 0)
147  {
148  u32 n_left_to_next;
149 
150  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
151 
152  while (n_left_from > 0 && n_left_to_next > 0)
153  {
154  u32 i_bi0, o_bi0, next0;
155  vlib_buffer_t *i_b0, *o_b0 = 0;
156  u32 sa_index0;
157  ipsec_sa_t *sa0;
158  ip4_and_esp_header_t *ih0, *oh0 = 0;
159  ip6_and_esp_header_t *ih6_0, *oh6_0 = 0;
160  uword last_empty_buffer;
161  esp_header_t *o_esp0;
162  esp_footer_t *f0;
163  u8 is_ipv6;
164  u8 ip_hdr_size;
165  u8 next_hdr_type;
166  u32 ip_proto = 0;
167  u8 transport_mode = 0;
168 
169  i_bi0 = from[0];
170  from += 1;
171  n_left_from -= 1;
172  n_left_to_next -= 1;
173 
174  next0 = ESP_ENCRYPT_NEXT_DROP;
175 
176  i_b0 = vlib_get_buffer (vm, i_bi0);
177  sa_index0 = vnet_buffer (i_b0)->ipsec.sad_index;
178  sa0 = pool_elt_at_index (im->sad, sa_index0);
179 
180  if (PREDICT_FALSE (esp_seq_advance (sa0)))
181  {
182  clib_warning ("sequence number counter has cycled SPI %u",
183  sa0->spi);
185  ESP_ENCRYPT_ERROR_SEQ_CYCLED, 1);
186  //TODO: rekey SA
187  o_bi0 = i_bi0;
188  to_next[0] = o_bi0;
189  to_next += 1;
190  goto trace;
191  }
192 
193  sa0->total_data_size += i_b0->current_length;
194 
195  /* grab free buffer */
196  last_empty_buffer = vec_len (empty_buffers) - 1;
197  o_bi0 = empty_buffers[last_empty_buffer];
198  o_b0 = vlib_get_buffer (vm, o_bi0);
200  o_b0->current_data = sizeof (ethernet_header_t);
201  ih0 = vlib_buffer_get_current (i_b0);
203  empty_buffers[last_empty_buffer -
204  1], STORE);
205  _vec_len (empty_buffers) = last_empty_buffer;
206  to_next[0] = o_bi0;
207  to_next += 1;
208 
209  /* add old buffer to the recycle list */
210  vec_add1 (recycle, i_bi0);
211 
212  /* is ipv6 */
213  if (PREDICT_FALSE
214  ((ih0->ip4.ip_version_and_header_length & 0xF0) == 0x60))
215  {
216  is_ipv6 = 1;
217  ih6_0 = vlib_buffer_get_current (i_b0);
218  ip_hdr_size = sizeof (ip6_header_t);
219  next_hdr_type = IP_PROTOCOL_IPV6;
220  oh6_0 = vlib_buffer_get_current (o_b0);
221  o_esp0 = vlib_buffer_get_current (o_b0) + sizeof (ip6_header_t);
222 
223  oh6_0->ip6.ip_version_traffic_class_and_flow_label =
224  ih6_0->ip6.ip_version_traffic_class_and_flow_label;
225  oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_ESP;
226  oh6_0->ip6.hop_limit = 254;
227  oh6_0->ip6.src_address.as_u64[0] =
228  ih6_0->ip6.src_address.as_u64[0];
229  oh6_0->ip6.src_address.as_u64[1] =
230  ih6_0->ip6.src_address.as_u64[1];
231  oh6_0->ip6.dst_address.as_u64[0] =
232  ih6_0->ip6.dst_address.as_u64[0];
233  oh6_0->ip6.dst_address.as_u64[1] =
234  ih6_0->ip6.dst_address.as_u64[1];
235  oh6_0->esp.spi = clib_net_to_host_u32 (sa0->spi);
236  oh6_0->esp.seq = clib_net_to_host_u32 (sa0->seq);
237  ip_proto = ih6_0->ip6.protocol;
238 
239  next0 = ESP_ENCRYPT_NEXT_IP6_LOOKUP;
240  }
241  else
242  {
243  is_ipv6 = 0;
244  ip_hdr_size = sizeof (ip4_header_t);
245  next_hdr_type = IP_PROTOCOL_IP_IN_IP;
246  oh0 = vlib_buffer_get_current (o_b0);
247  o_esp0 = vlib_buffer_get_current (o_b0) + sizeof (ip4_header_t);
248 
249  oh0->ip4.ip_version_and_header_length = 0x45;
250  oh0->ip4.tos = ih0->ip4.tos;
251  oh0->ip4.fragment_id = 0;
252  oh0->ip4.flags_and_fragment_offset = 0;
253  oh0->ip4.ttl = 254;
254  oh0->ip4.protocol = IP_PROTOCOL_IPSEC_ESP;
255  oh0->ip4.src_address.as_u32 = ih0->ip4.src_address.as_u32;
256  oh0->ip4.dst_address.as_u32 = ih0->ip4.dst_address.as_u32;
257  oh0->esp.spi = clib_net_to_host_u32 (sa0->spi);
258  oh0->esp.seq = clib_net_to_host_u32 (sa0->seq);
259  ip_proto = ih0->ip4.protocol;
260 
261  next0 = ESP_ENCRYPT_NEXT_IP4_LOOKUP;
262  }
263 
264  if (PREDICT_TRUE
265  (!is_ipv6 && sa0->is_tunnel && !sa0->is_tunnel_ip6))
266  {
267  oh0->ip4.src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32;
268  oh0->ip4.dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32;
269 
270  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
271  }
272  else if (is_ipv6 && sa0->is_tunnel && sa0->is_tunnel_ip6)
273  {
274  oh6_0->ip6.src_address.as_u64[0] =
275  sa0->tunnel_src_addr.ip6.as_u64[0];
276  oh6_0->ip6.src_address.as_u64[1] =
277  sa0->tunnel_src_addr.ip6.as_u64[1];
278  oh6_0->ip6.dst_address.as_u64[0] =
279  sa0->tunnel_dst_addr.ip6.as_u64[0];
280  oh6_0->ip6.dst_address.as_u64[1] =
281  sa0->tunnel_dst_addr.ip6.as_u64[1];
282 
283  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
284  }
285  else
286  {
287  next_hdr_type = ip_proto;
288  if (vnet_buffer (i_b0)->sw_if_index[VLIB_TX] != ~0)
289  {
290  transport_mode = 1;
291  ethernet_header_t *ieh0, *oeh0;
292  ieh0 =
293  (ethernet_header_t *) ((u8 *)
294  vlib_buffer_get_current (i_b0) -
295  sizeof (ethernet_header_t));
296  oeh0 = (ethernet_header_t *) o_b0->data;
297  clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
298  next0 = ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT;
299  vnet_buffer (o_b0)->sw_if_index[VLIB_TX] =
300  vnet_buffer (i_b0)->sw_if_index[VLIB_TX];
301  }
302  vlib_buffer_advance (i_b0, ip_hdr_size);
303  }
304 
306 
307  if (PREDICT_TRUE (sa0->crypto_alg != IPSEC_CRYPTO_ALG_NONE))
308  {
309 
310  const int BLOCK_SIZE =
312  const int IV_SIZE =
314  int blocks = 1 + (i_b0->current_length + 1) / BLOCK_SIZE;
315 
316  /* pad packet in input buffer */
317  u8 pad_bytes = BLOCK_SIZE * blocks - 2 - i_b0->current_length;
318  u8 i;
319  u8 *padding =
321  i_b0->current_length = BLOCK_SIZE * blocks;
322  for (i = 0; i < pad_bytes; ++i)
323  {
324  padding[i] = i + 1;
325  }
326  f0 = vlib_buffer_get_current (i_b0) + i_b0->current_length - 2;
327  f0->pad_length = pad_bytes;
328  f0->next_header = next_hdr_type;
329 
330  o_b0->current_length = ip_hdr_size + sizeof (esp_header_t) +
331  BLOCK_SIZE * blocks + IV_SIZE;
332 
333  vnet_buffer (o_b0)->sw_if_index[VLIB_RX] =
334  vnet_buffer (i_b0)->sw_if_index[VLIB_RX];
335 
336  u8 iv[em->
337  ipsec_proto_main_crypto_algs[sa0->crypto_alg].iv_size];
338  RAND_bytes (iv, sizeof (iv));
339 
341  ip_hdr_size + sizeof (esp_header_t), iv,
343  crypto_alg].iv_size);
344 
346  (u8 *) vlib_buffer_get_current (i_b0),
347  (u8 *) vlib_buffer_get_current (o_b0) +
348  ip_hdr_size + sizeof (esp_header_t) +
349  IV_SIZE, BLOCK_SIZE * blocks,
350  sa0->crypto_key, iv);
351  }
352 
353  o_b0->current_length += hmac_calc (sa0->integ_alg, sa0->integ_key,
354  sa0->integ_key_len,
355  (u8 *) o_esp0,
356  o_b0->current_length -
357  ip_hdr_size,
358  vlib_buffer_get_current (o_b0) +
359  o_b0->current_length,
360  sa0->use_esn, sa0->seq_hi);
361 
362 
363  if (PREDICT_FALSE (is_ipv6))
364  {
365  oh6_0->ip6.payload_length =
366  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, o_b0) -
367  sizeof (ip6_header_t));
368  }
369  else
370  {
371  oh0->ip4.length =
372  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, o_b0));
373  oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4);
374  }
375 
376  if (transport_mode)
377  vlib_buffer_reset (o_b0);
378 
379  trace:
381  {
382  if (o_b0)
383  {
384  o_b0->flags |= VLIB_BUFFER_IS_TRACED;
385  o_b0->trace_index = i_b0->trace_index;
386  esp_encrypt_trace_t *tr =
387  vlib_add_trace (vm, node, o_b0, sizeof (*tr));
388  tr->spi = sa0->spi;
389  tr->seq = sa0->seq - 1;
390  tr->crypto_alg = sa0->crypto_alg;
391  tr->integ_alg = sa0->integ_alg;
392  }
393  }
394 
395  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
396  to_next, n_left_to_next, o_bi0,
397  next0);
398  }
399  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
400  }
402  ESP_ENCRYPT_ERROR_RX_PKTS,
403  from_frame->n_vectors);
404 
405 free_buffers_and_exit:
406  if (recycle)
407  vlib_buffer_free (vm, recycle, vec_len (recycle));
408  vec_free (recycle);
409  return from_frame->n_vectors;
410 }
411 
412 
413 /* *INDENT-OFF* */
415  .function = esp_encrypt_node_fn,
416  .name = "esp-encrypt",
417  .vector_size = sizeof (u32),
418  .format_trace = format_esp_encrypt_trace,
419  .type = VLIB_NODE_TYPE_INTERNAL,
420 
422  .error_strings = esp_encrypt_error_strings,
423 
424  .n_next_nodes = ESP_ENCRYPT_N_NEXT,
425  .next_nodes = {
426 #define _(s,n) [ESP_ENCRYPT_NEXT_##s] = n,
428 #undef _
429  },
430 };
431 /* *INDENT-ON* */
432 
434 /*
435  * fd.io coding-style-patch-verification: ON
436  *
437  * Local Variables:
438  * eval: (c-set-style "gnu")
439  * End:
440  */
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:130
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:234
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:356
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: memory_vlib.c:1679
#define PREDICT_TRUE(x)
Definition: clib.h:106
static uword esp_encrypt_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: esp_encrypt.c:121
#define NULL
Definition: clib.h:55
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:323
ipsec_integ_alg_t integ_alg
Definition: ipsec.h:121
#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:128
struct _vlib_node_registration vlib_node_registration_t
static u8 * format_esp_encrypt_trace(u8 *s, va_list *args)
Definition: esp_encrypt.c:74
ipsec_integ_alg_t integ_alg
Definition: esp_encrypt.c:69
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
ipsec_crypto_alg_t crypto_alg
Definition: esp_encrypt.c:68
const EVP_CIPHER * type
Definition: esp.h:54
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
ipsec_proto_main_crypto_alg_t * ipsec_proto_main_crypto_algs
Definition: esp.h:92
u8 crypto_key[128]
Definition: ipsec.h:119
u32 spi
Definition: ipsec.h:114
ipsec_proto_main_t ipsec_proto_main
Definition: esp_encrypt.c:25
u32 seq_hi
Definition: ipsec.h:137
static int esp_seq_advance(ipsec_sa_t *sa)
Definition: esp.h:225
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:123
#define foreach_esp_encrypt_next
Definition: esp_encrypt.c:27
#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:181
ipsec_main_t ipsec_main
Definition: ipsec.c:28
#define always_inline
Definition: clib.h:92
vlib_node_registration_t esp_encrypt_node
(constructor) VLIB_REGISTER_NODE (esp_encrypt_node)
Definition: esp_encrypt.c:62
u8 use_esn
Definition: ipsec.h:125
#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:48
ipsec_proto_main_per_thread_data_t * per_thread_data
Definition: esp.h:94
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:459
ipsec_integ_alg_t
Definition: ipsec.h:97
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:72
u8 is_tunnel_ip6
Definition: ipsec.h:129
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:195
#define PREDICT_FALSE(x)
Definition: clib.h:105
ipsec_crypto_alg_t last_encrypt_alg
Definition: esp.h:85
#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:364
static char * esp_encrypt_error_strings[]
Definition: esp_encrypt.c:56
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:131
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:75
static void ipsec_alloc_empty_buffers(vlib_main_t *vm, ipsec_main_t *im)
Definition: ipsec.h:347
#define ARRAY_LEN(x)
Definition: clib.h:59
esp_encrypt_next_t
Definition: esp_encrypt.c:34
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
static void esp_encrypt_cbc(ipsec_crypto_alg_t alg, u8 *in, u8 *out, size_t in_len, u8 *key, u8 *iv)
Definition: esp_encrypt.c:88
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:122
ipsec_sa_t * sad
Definition: ipsec.h:258
ipsec_crypto_alg_t
Definition: ipsec.h:80
u64 total_data_size
Definition: ipsec.h:143
u8 integ_key_len
Definition: ipsec.h:122
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:208
EVP_CIPHER_CTX encrypt_ctx
Definition: esp.h:71
u32 seq
Definition: ipsec.h:136
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
#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:326
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:158
ipsec_crypto_alg_t crypto_alg
Definition: ipsec.h:117
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:159
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:264
#define foreach_esp_encrypt_error
Definition: esp_encrypt.c:41
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:137
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:239
Definition: defs.h:46