FD.io VPP  v17.01-9-ge7dcee4
Vector Packet Processing
ip_frag.c
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1 /*---------------------------------------------------------------------------
2  * Copyright (c) 2009-2014 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  *---------------------------------------------------------------------------
15  */
16 /*
17  * IPv4 Fragmentation Node
18  *
19  *
20  */
21 
22 #include "ip_frag.h"
23 
24 #include <vnet/ip/ip.h>
25 
26 
27 typedef struct
28 {
35 
36 static u8 *
37 format_ip_frag_trace (u8 * s, va_list * args)
38 {
39  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
40  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
41  ip_frag_trace_t *t = va_arg (*args, ip_frag_trace_t *);
42  s = format (s, "IPv%s offset: %u mtu: %u fragments: %u",
43  t->ipv6 ? "6" : "4", t->header_offset, t->mtu, t->n_fragments);
44  return s;
45 }
46 
48 
49 static void
50 ip4_frag_do_fragment (vlib_main_t * vm, u32 pi, u32 ** buffer,
51  ip_frag_error_t * error)
52 {
53  vlib_buffer_t *p;
54  ip4_header_t *ip4;
55  u16 mtu, ptr, len, max, rem, offset, ip_frag_id, ip_frag_offset;
56  u8 *packet, more;
57 
58  vec_add1 (*buffer, pi);
59  p = vlib_get_buffer (vm, pi);
60  offset = vnet_buffer (p)->ip_frag.header_offset;
61  mtu = vnet_buffer (p)->ip_frag.mtu;
62  packet = (u8 *) vlib_buffer_get_current (p);
63  ip4 = (ip4_header_t *) (packet + offset);
64 
65  rem = clib_net_to_host_u16 (ip4->length) - sizeof (*ip4);
66  ptr = 0;
67  max = (mtu - sizeof (*ip4) - vnet_buffer (p)->ip_frag.header_offset) & ~0x7;
68 
69  if (rem < (p->current_length - offset - sizeof (*ip4)))
70  {
71  *error = IP_FRAG_ERROR_MALFORMED;
72  return;
73  }
74 
75  if (mtu < sizeof (*ip4))
76  {
77  *error = IP_FRAG_ERROR_CANT_FRAGMENT_HEADER;
78  return;
79  }
80 
81  if (ip4->flags_and_fragment_offset &
82  clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT))
83  {
84  *error = IP_FRAG_ERROR_DONT_FRAGMENT_SET;
85  return;
86  }
87 
88  if (ip4_is_fragment (ip4))
89  {
90  ip_frag_id = ip4->fragment_id;
91  ip_frag_offset = ip4_get_fragment_offset (ip4);
92  more =
93  ! !(ip4->flags_and_fragment_offset &
94  clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS));
95  }
96  else
97  {
98  ip_frag_id = (++running_fragment_id);
99  ip_frag_offset = 0;
100  more = 0;
101  }
102 
103  //Do the actual fragmentation
104  while (rem)
105  {
106  u32 bi;
107  vlib_buffer_t *b;
108  ip4_header_t *fip4;
109 
110  len =
111  (rem >
112  (mtu - sizeof (*ip4) -
113  vnet_buffer (p)->ip_frag.header_offset)) ? max : rem;
114 
115  if (ptr == 0)
116  {
117  bi = pi;
118  b = p;
119  fip4 = (ip4_header_t *) (vlib_buffer_get_current (b) + offset);
120  }
121  else
122  {
123  if (!vlib_buffer_alloc (vm, &bi, 1))
124  {
125  *error = IP_FRAG_ERROR_MEMORY;
126  return;
127  }
128  vec_add1 (*buffer, bi);
129  b = vlib_get_buffer (vm, bi);
130  vnet_buffer (b)->sw_if_index[VLIB_RX] =
131  vnet_buffer (p)->sw_if_index[VLIB_RX];
132  vnet_buffer (b)->sw_if_index[VLIB_TX] =
133  vnet_buffer (p)->sw_if_index[VLIB_TX];
134  fip4 = (ip4_header_t *) (vlib_buffer_get_current (b) + offset);
135 
136  //Copy offset and ip4 header
137  clib_memcpy (b->data, packet, offset + sizeof (*ip4));
138  //Copy data
139  clib_memcpy (((u8 *) (fip4)) + sizeof (*fip4),
140  packet + offset + sizeof (*fip4) + ptr, len);
141  }
142  b->current_length = offset + len + sizeof (*fip4);
143 
144  fip4->fragment_id = ip_frag_id;
146  clib_host_to_net_u16 ((ptr >> 3) + ip_frag_offset);
148  clib_host_to_net_u16 (((len != rem) || more) << 13);
149  // ((len0 != rem0) || more0) << 13 is optimization for
150  // ((len0 != rem0) || more0) ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0
151  fip4->length = clib_host_to_net_u16 (len + sizeof (*fip4));
152  fip4->checksum = ip4_header_checksum (fip4);
153 
154  if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP4_HEADER)
155  {
156  //Encapsulating ipv4 header
157  ip4_header_t *encap_header4 =
159  encap_header4->length = clib_host_to_net_u16 (b->current_length);
160  encap_header4->checksum = ip4_header_checksum (encap_header4);
161  }
162  else if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP6_HEADER)
163  {
164  //Encapsulating ipv6 header
165  ip6_header_t *encap_header6 =
167  encap_header6->payload_length =
168  clib_host_to_net_u16 (b->current_length -
169  sizeof (*encap_header6));
170  }
171 
172  rem -= len;
173  ptr += len;
174  }
175 }
176 
177 void
179  u8 next_index, u8 flags)
180 {
181  vnet_buffer (b)->ip_frag.header_offset = offset;
182  vnet_buffer (b)->ip_frag.mtu = mtu;
183  vnet_buffer (b)->ip_frag.next_index = next_index;
184  vnet_buffer (b)->ip_frag.flags = flags;
185 }
186 
187 static uword
189 {
190  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
191  vlib_node_runtime_t *error_node =
193  from = vlib_frame_vector_args (frame);
194  n_left_from = frame->n_vectors;
195  next_index = node->cached_next_index;
196  u32 frag_sent = 0, small_packets = 0;
197  u32 *buffer = 0;
198 
199  while (n_left_from > 0)
200  {
201  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
202 
203  while (n_left_from > 0 && n_left_to_next > 0)
204  {
205  u32 pi0, *frag_from, frag_left;
206  vlib_buffer_t *p0;
207  ip_frag_error_t error0;
208  ip4_frag_next_t next0;
209 
210  //Note: The packet is not enqueued now.
211  //It is instead put in a vector where other fragments
212  //will be put as well.
213  pi0 = from[0];
214  from += 1;
215  n_left_from -= 1;
216  error0 = IP_FRAG_ERROR_NONE;
217 
218  p0 = vlib_get_buffer (vm, pi0);
219  ip4_frag_do_fragment (vm, pi0, &buffer, &error0);
220 
222  {
223  ip_frag_trace_t *tr =
224  vlib_add_trace (vm, node, p0, sizeof (*tr));
225  tr->header_offset = vnet_buffer (p0)->ip_frag.header_offset;
226  tr->mtu = vnet_buffer (p0)->ip_frag.mtu;
227  tr->ipv6 = 0;
228  tr->n_fragments = vec_len (buffer);
229  tr->next = vnet_buffer (p0)->ip_frag.next_index;
230  }
231 
232  if (error0 == IP_FRAG_ERROR_DONT_FRAGMENT_SET)
233  {
234  icmp4_error_set_vnet_buffer (p0, ICMP4_destination_unreachable,
235  ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
236  vnet_buffer (p0)->ip_frag.mtu);
238  vnet_buffer (p0)->ip_frag.header_offset);
239  next0 = IP4_FRAG_NEXT_ICMP_ERROR;
240  }
241  else
242  next0 =
243  (error0 ==
244  IP_FRAG_ERROR_NONE) ? vnet_buffer (p0)->
245  ip_frag.next_index : IP4_FRAG_NEXT_DROP;
246 
247  if (error0 == IP_FRAG_ERROR_NONE)
248  {
249  frag_sent += vec_len (buffer);
250  small_packets += (vec_len (buffer) == 1);
251  }
252  else
253  vlib_error_count (vm, ip4_frag_node.index, error0, 1);
254 
255  //Send fragments that were added in the frame
256  frag_from = buffer;
257  frag_left = vec_len (buffer);
258 
259  while (frag_left > 0)
260  {
261  while (frag_left > 0 && n_left_to_next > 0)
262  {
263  u32 i;
264  i = to_next[0] = frag_from[0];
265  frag_from += 1;
266  frag_left -= 1;
267  to_next += 1;
268  n_left_to_next -= 1;
269 
270  vlib_get_buffer (vm, i)->error = error_node->errors[error0];
271  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
272  to_next, n_left_to_next, i,
273  next0);
274  }
275  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
276  vlib_get_next_frame (vm, node, next_index, to_next,
277  n_left_to_next);
278  }
279  vec_reset_length (buffer);
280  }
281  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
282  }
283  vec_free (buffer);
284 
286  IP_FRAG_ERROR_FRAGMENT_SENT, frag_sent);
288  IP_FRAG_ERROR_SMALL_PACKET, small_packets);
289 
290  return frame->n_vectors;
291 }
292 
293 
294 static void
296  ip_frag_error_t * error)
297 {
298  vlib_buffer_t *p;
299  ip6_header_t *ip6_hdr;
300  ip6_frag_hdr_t *frag_hdr;
301  u8 *payload, *next_header;
302 
303  p = vlib_get_buffer (vm, pi);
304 
305  //Parsing the IPv6 headers
306  ip6_hdr =
307  vlib_buffer_get_current (p) + vnet_buffer (p)->ip_frag.header_offset;
308  payload = (u8 *) (ip6_hdr + 1);
309  next_header = &ip6_hdr->protocol;
310  if (*next_header == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
311  {
312  next_header = payload;
313  payload += payload[1] * 8;
314  }
315 
316  if (*next_header == IP_PROTOCOL_IP6_DESTINATION_OPTIONS)
317  {
318  next_header = payload;
319  payload += payload[1] * 8;
320  }
321 
322  if (*next_header == IP_PROTOCOL_IPV6_ROUTE)
323  {
324  next_header = payload;
325  payload += payload[1] * 8;
326  }
327 
328  if (PREDICT_FALSE
329  (payload >= (u8 *) vlib_buffer_get_current (p) + p->current_length))
330  {
331  //A malicious packet could set an extension header with a too big size
332  //and make us modify another vlib_buffer
333  *error = IP_FRAG_ERROR_MALFORMED;
334  return;
335  }
336 
337  u8 has_more;
338  u16 initial_offset;
339  if (*next_header == IP_PROTOCOL_IPV6_FRAGMENTATION)
340  {
341  //The fragmentation header is already there
342  frag_hdr = (ip6_frag_hdr_t *) payload;
343  has_more = ip6_frag_hdr_more (frag_hdr);
344  initial_offset = ip6_frag_hdr_offset (frag_hdr);
345  }
346  else
347  {
348  //Insert a fragmentation header in the packet
349  u8 nh = *next_header;
350  *next_header = IP_PROTOCOL_IPV6_FRAGMENTATION;
351  vlib_buffer_advance (p, -sizeof (*frag_hdr));
352  u8 *start = vlib_buffer_get_current (p);
353  memmove (start, start + sizeof (*frag_hdr),
354  payload - (start + sizeof (*frag_hdr)));
355  frag_hdr = (ip6_frag_hdr_t *) (payload - sizeof (*frag_hdr));
356  frag_hdr->identification = ++running_fragment_id;
357  frag_hdr->next_hdr = nh;
358  frag_hdr->rsv = 0;
359  has_more = 0;
360  initial_offset = 0;
361  }
362  payload = (u8 *) (frag_hdr + 1);
363 
364  u16 headers_len = payload - (u8 *) vlib_buffer_get_current (p);
365  u16 max_payload = vnet_buffer (p)->ip_frag.mtu - headers_len;
366  u16 rem = p->current_length - headers_len;
367  u16 ptr = 0;
368 
369  if (max_payload < 8)
370  {
371  *error = IP_FRAG_ERROR_CANT_FRAGMENT_HEADER;
372  return;
373  }
374 
375  while (rem)
376  {
377  u32 bi;
378  vlib_buffer_t *b;
379  u16 len = (rem > max_payload) ? (max_payload & ~0x7) : rem;
380  rem -= len;
381 
382  if (ptr != 0)
383  {
384  if (!vlib_buffer_alloc (vm, &bi, 1))
385  {
386  *error = IP_FRAG_ERROR_MEMORY;
387  return;
388  }
389  b = vlib_get_buffer (vm, bi);
390  vnet_buffer (b)->sw_if_index[VLIB_RX] =
391  vnet_buffer (p)->sw_if_index[VLIB_RX];
392  vnet_buffer (b)->sw_if_index[VLIB_TX] =
393  vnet_buffer (p)->sw_if_index[VLIB_TX];
395  vlib_buffer_get_current (p), headers_len);
396  clib_memcpy (vlib_buffer_get_current (b) + headers_len,
397  payload + ptr, len);
398  frag_hdr =
399  vlib_buffer_get_current (b) + headers_len - sizeof (*frag_hdr);
400  }
401  else
402  {
403  bi = pi;
404  b = vlib_get_buffer (vm, bi);
405  //frag_hdr already set here
406  }
407 
408  ip6_hdr =
409  vlib_buffer_get_current (b) + vnet_buffer (p)->ip_frag.header_offset;
410  frag_hdr->fragment_offset_and_more =
411  ip6_frag_hdr_offset_and_more (initial_offset + (ptr >> 3),
412  (rem || has_more));
413  b->current_length = headers_len + len;
414  ip6_hdr->payload_length =
415  clib_host_to_net_u16 (b->current_length -
416  vnet_buffer (p)->ip_frag.header_offset -
417  sizeof (*ip6_hdr));
418 
419  if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP4_HEADER)
420  {
421  //Encapsulating ipv4 header
422  ip4_header_t *encap_header4 =
424  encap_header4->length = clib_host_to_net_u16 (b->current_length);
425  encap_header4->checksum = ip4_header_checksum (encap_header4);
426  }
427  else if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP6_HEADER)
428  {
429  //Encapsulating ipv6 header
430  ip6_header_t *encap_header6 =
432  encap_header6->payload_length =
433  clib_host_to_net_u16 (b->current_length -
434  sizeof (*encap_header6));
435  }
436 
437  vec_add1 (*buffer, bi);
438 
439  ptr += len;
440  }
441 }
442 
443 static uword
445 {
446  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
447  vlib_node_runtime_t *error_node =
449  from = vlib_frame_vector_args (frame);
450  n_left_from = frame->n_vectors;
451  next_index = node->cached_next_index;
452  u32 frag_sent = 0, small_packets = 0;
453  u32 *buffer = 0;
454 
455  while (n_left_from > 0)
456  {
457  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
458 
459  while (n_left_from > 0 && n_left_to_next > 0)
460  {
461  u32 pi0, *frag_from, frag_left;
462  vlib_buffer_t *p0;
463  ip_frag_error_t error0;
464  ip6_frag_next_t next0;
465 
466  pi0 = from[0];
467  from += 1;
468  n_left_from -= 1;
469  error0 = IP_FRAG_ERROR_NONE;
470 
471  p0 = vlib_get_buffer (vm, pi0);
472  ip6_frag_do_fragment (vm, pi0, &buffer, &error0);
473 
475  {
476  ip_frag_trace_t *tr =
477  vlib_add_trace (vm, node, p0, sizeof (*tr));
478  tr->header_offset = vnet_buffer (p0)->ip_frag.header_offset;
479  tr->mtu = vnet_buffer (p0)->ip_frag.mtu;
480  tr->ipv6 = 1;
481  tr->n_fragments = vec_len (buffer);
482  tr->next = vnet_buffer (p0)->ip_frag.next_index;
483  }
484 
485  next0 =
486  (error0 ==
487  IP_FRAG_ERROR_NONE) ? vnet_buffer (p0)->
488  ip_frag.next_index : IP6_FRAG_NEXT_DROP;
489  frag_sent += vec_len (buffer);
490  small_packets += (vec_len (buffer) == 1);
491 
492  //Send fragments that were added in the frame
493  frag_from = buffer;
494  frag_left = vec_len (buffer);
495  while (frag_left > 0)
496  {
497  while (frag_left > 0 && n_left_to_next > 0)
498  {
499  u32 i;
500  i = to_next[0] = frag_from[0];
501  frag_from += 1;
502  frag_left -= 1;
503  to_next += 1;
504  n_left_to_next -= 1;
505 
506  vlib_get_buffer (vm, i)->error = error_node->errors[error0];
507  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
508  to_next, n_left_to_next, i,
509  next0);
510  }
511  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
512  vlib_get_next_frame (vm, node, next_index, to_next,
513  n_left_to_next);
514  }
515  vec_reset_length (buffer);
516  }
517  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
518  }
519  vec_free (buffer);
521  IP_FRAG_ERROR_FRAGMENT_SENT, frag_sent);
523  IP_FRAG_ERROR_SMALL_PACKET, small_packets);
524 
525  return frame->n_vectors;
526 }
527 
528 static char *ip4_frag_error_strings[] = {
529 #define _(sym,string) string,
531 #undef _
532 };
533 
534 /* *INDENT-OFF* */
536  .function = ip4_frag,
537  .name = IP4_FRAG_NODE_NAME,
538  .vector_size = sizeof (u32),
539  .format_trace = format_ip_frag_trace,
541 
542  .n_errors = IP_FRAG_N_ERROR,
543  .error_strings = ip4_frag_error_strings,
544 
545  .n_next_nodes = IP4_FRAG_N_NEXT,
546  .next_nodes = {
547  [IP4_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
548  [IP4_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
549  [IP4_FRAG_NEXT_ICMP_ERROR] = "ip4-icmp-error",
550  [IP4_FRAG_NEXT_DROP] = "error-drop"
551  },
552 };
553 /* *INDENT-ON* */
554 
555 /* *INDENT-OFF* */
557  .function = ip6_frag,
558  .name = IP6_FRAG_NODE_NAME,
559  .vector_size = sizeof (u32),
560  .format_trace = format_ip_frag_trace,
562 
563  .n_errors = IP_FRAG_N_ERROR,
564  .error_strings = ip4_frag_error_strings,
565 
566  .n_next_nodes = IP6_FRAG_N_NEXT,
567  .next_nodes = {
568  [IP6_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
569  [IP6_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
570  [IP6_FRAG_NEXT_DROP] = "error-drop"
571  },
572 };
573 /* *INDENT-ON* */
574 
575 /*
576  * fd.io coding-style-patch-verification: ON
577  *
578  * Local Variables:
579  * eval: (c-set-style "gnu")
580  * End:
581  */
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
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:343
#define CLIB_UNUSED(x)
Definition: clib.h:79
#define foreach_ip_frag_error
Definition: ip_frag.h:66
void ip_frag_set_vnet_buffer(vlib_buffer_t *b, u16 offset, u16 mtu, u8 next_index, u8 flags)
Definition: ip_frag.c:178
bad routing header type(not 4)") sr_error (NO_MORE_SEGMENTS
#define IP6_FRAG_NODE_NAME
Definition: ip_frag.h:44
static void vlib_error_count(vlib_main_t *vm, uword node_index, uword counter, uword increment)
Definition: error_funcs.h:55
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:482
u16 flags_and_fragment_offset
Definition: ip4_packet.h:144
u16 n_fragments
Definition: ip_frag.c:33
vlib_error_t * errors
Definition: node.h:419
static u8 * format_ip_frag_trace(u8 *s, va_list *args)
Definition: ip_frag.c:37
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
static u32 running_fragment_id
Definition: ip_frag.c:47
static void ip6_frag_do_fragment(vlib_main_t *vm, u32 pi, u32 **buffer, ip_frag_error_t *error)
Definition: ip_frag.c:295
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:194
static int ip4_get_fragment_offset(ip4_header_t *i)
Definition: ip4_packet.h:191
static uword ip4_frag(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip_frag.c:188
static int ip4_is_fragment(ip4_header_t *i)
Definition: ip4_packet.h:204
#define ip6_frag_hdr_more(hdr)
Definition: ip6_packet.h:485
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:82
#define IP4_FRAG_NODE_NAME
Definition: ip_frag.h:43
#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:350
vlib_node_registration_t ip6_frag_node
(constructor) VLIB_REGISTER_NODE (ip6_frag_node)
Definition: ip_frag.c:556
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:121
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1113
#define IP4_HEADER_FLAG_MORE_FRAGMENTS
Definition: ip4_packet.h:145
u16 n_vectors
Definition: node.h:344
ip_frag_error_t
Definition: ip_frag.h:77
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:300
void icmp4_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp4.c:431
static vlib_node_runtime_t * vlib_node_get_runtime(vlib_main_t *vm, u32 node_index)
Get node runtime by node index.
Definition: node_funcs.h:88
#define clib_memcpy(a, b, c)
Definition: string.h:69
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:207
#define ip6_frag_hdr_offset(hdr)
Definition: ip6_packet.h:482
#define IP_FRAG_FLAG_IP6_HEADER
Definition: ip_frag.h:41
u16 cached_next_index
Definition: node.h:463
unsigned int u32
Definition: types.h:88
#define IP_FRAG_FLAG_IP4_HEADER
Definition: ip_frag.h:40
#define vnet_buffer(b)
Definition: buffer.h:361
u16 header_offset
Definition: ip_frag.c:30
u32 vlib_buffer_alloc(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Allocate buffers into supplied array.
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.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
template key/value backing page structure
Definition: bihash_doc.h:44
Definition: defs.h:47
unsigned short u16
Definition: types.h:57
u16 payload_length
Definition: ip6_packet.h:328
vlib_node_registration_t ip4_frag_node
(constructor) VLIB_REGISTER_NODE (ip4_frag_node)
Definition: ip_frag.c:535
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
static char * ip4_frag_error_strings[]
Definition: ip_frag.c:528
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:253
struct clib_bihash_value offset
template key/value backing page structure
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
static void ip4_frag_do_fragment(vlib_main_t *vm, u32 pi, u32 **buffer, ip_frag_error_t *error)
Definition: ip_frag.c:50
u8 data[0]
Packet data.
Definition: buffer.h:158
static uword ip6_frag(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip_frag.c:444
ip6_frag_next_t
Definition: ip_frag.h:58
#define IP4_HEADER_FLAG_DONT_FRAGMENT
Definition: ip4_packet.h:146
#define ip6_frag_hdr_offset_and_more(offset, more)
Definition: ip6_packet.h:488
u32 flags
Definition: vhost-user.h:75
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:85
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
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:238
ip4_frag_next_t
Definition: ip_frag.h:49
Definition: defs.h:46